1	/*
2	* Copyright (c) 2001 The Regents of the University of Michigan.
3	* All rights reserved.
4	*
5	* Kendrick Smith <kmsmith@umich.edu>
6	* Andy Adamson <kandros@umich.edu>
7	*
8	* Redistribution and use in source and binary forms, with or without
9	* modification, are permitted provided that the following conditions
10	* are met:
11	*
12	* 1. Redistributions of source code must retain the above copyright
13	* notice, this list of conditions and the following disclaimer.
14	* 2. Redistributions in binary form must reproduce the above copyright
15	* notice, this list of conditions and the following disclaimer in the
16	* documentation and/or other materials provided with the distribution.
17	* 3. Neither the name of the University nor the names of its
18	* contributors may be used to endorse or promote products derived
19	* from this software without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
22	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
23	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
28	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
29	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
31	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32	*
33	*/
34
35	#include <linux/file.h>
36	#include <linux/fs.h>
37	#include <linux/slab.h>
38	#include <linux/namei.h>
39	#include <linux/swap.h>
40	#include <linux/pagemap.h>
41	#include <linux/ratelimit.h>
42	#include <linux/sunrpc/svcauth_gss.h>
43	#include <linux/sunrpc/addr.h>
44	#include <linux/jhash.h>
45	#include <linux/string_helpers.h>
46	#include <linux/fsnotify.h>
47	#include <linux/rhashtable.h>
48	#include <linux/nfs_ssc.h>
49
50	#include "xdr4.h"
51	#include "xdr4cb.h"
52	#include "vfs.h"
53	#include "current_stateid.h"
54
55	#include "netns.h"
56	#include "pnfs.h"
57	#include "filecache.h"
58	#include "trace.h"
59
60	#define NFSDDBG_FACILITY NFSDDBG_PROC
61
62	#define all_ones {{ ~0, ~0}, ~0}
63	static const stateid_t one_stateid = {
64	.si_generation = ~0,
65	.si_opaque = all_ones,
66	};
67	static const stateid_t zero_stateid = {
68	/* all fields zero */
69	};
70	static const stateid_t currentstateid = {
71	.si_generation = 1,
72	};
73	static const stateid_t close_stateid = {
74	.si_generation = 0xffffffffU,
75	};
76
77	static u64 current_sessionid = 1;
78
79	#define ZERO_STATEID(stateid) (!memcmp((stateid), &zero_stateid, sizeof(stateid_t)))
80	#define ONE_STATEID(stateid) (!memcmp((stateid), &one_stateid, sizeof(stateid_t)))
81	#define CURRENT_STATEID(stateid) (!memcmp((stateid), &currentstateid, sizeof(stateid_t)))
82	#define CLOSE_STATEID(stateid) (!memcmp((stateid), &close_stateid, sizeof(stateid_t)))
83
84	/* forward declarations */
85	static bool check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner);
86	static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
87	void nfsd4_end_grace(struct nfsd_net *nn);
88	static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
89	static void nfsd4_file_hash_remove(struct nfs4_file *fi);
90
91	/* Locking: */
92
93	/*
94	* Currently used for the del_recall_lru and file hash table. In an
95	* effort to decrease the scope of the client_mutex, this spinlock may
96	* eventually cover more:
97	*/
98	static DEFINE_SPINLOCK(state_lock);
99
100	enum nfsd4_st_mutex_lock_subclass {
101	OPEN_STATEID_MUTEX = 0,
102	LOCK_STATEID_MUTEX = 1,
103	};
104
105	/*
106	* A waitqueue for all in-progress 4.0 CLOSE operations that are waiting for
107	* the refcount on the open stateid to drop.
108	*/
109	static DECLARE_WAIT_QUEUE_HEAD(close_wq);
110
111	/*
112	* A waitqueue where a writer to clients/#/ctl destroying a client can
113	* wait for cl_rpc_users to drop to 0 and then for the client to be
114	* unhashed.
115	*/
116	static DECLARE_WAIT_QUEUE_HEAD(expiry_wq);
117
118	static struct kmem_cache *client_slab;
119	static struct kmem_cache *openowner_slab;
120	static struct kmem_cache *lockowner_slab;
121	static struct kmem_cache *file_slab;
122	static struct kmem_cache *stateid_slab;
123	static struct kmem_cache *deleg_slab;
124	static struct kmem_cache *odstate_slab;
125
126	static void free_session(struct nfsd4_session *);
127
128	static const struct nfsd4_callback_ops nfsd4_cb_recall_ops;
129	static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops;
130	static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops;
131
132	static struct workqueue_struct *laundry_wq;
133
134	int nfsd4_create_laundry_wq(void)
135	{
136	int rc = 0;
137
138	laundry_wq = alloc_workqueue(fmt: "%s", flags: WQ_UNBOUND, max_active: 0, "nfsd4");
139	if (laundry_wq == NULL)
140	rc = -ENOMEM;
141	return rc;
142	}
143
144	void nfsd4_destroy_laundry_wq(void)
145	{
146	destroy_workqueue(wq: laundry_wq);
147	}
148
149	static bool is_session_dead(struct nfsd4_session *ses)
150	{
151	return ses->se_flags & NFS4_SESSION_DEAD;
152	}
153
154	static __be32 mark_session_dead_locked(struct nfsd4_session *ses, int ref_held_by_me)
155	{
156	if (atomic_read(v: &ses->se_ref) > ref_held_by_me)
157	return nfserr_jukebox;
158	ses->se_flags |= NFS4_SESSION_DEAD;
159	return nfs_ok;
160	}
161
162	static bool is_client_expired(struct nfs4_client *clp)
163	{
164	return clp->cl_time == 0;
165	}
166
167	static void nfsd4_dec_courtesy_client_count(struct nfsd_net *nn,
168	struct nfs4_client *clp)
169	{
170	if (clp->cl_state != NFSD4_ACTIVE)
171	atomic_add_unless(v: &nn->nfsd_courtesy_clients, a: -1, u: 0);
172	}
173
174	static __be32 get_client_locked(struct nfs4_client *clp)
175	{
176	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
177
178	lockdep_assert_held(&nn->client_lock);
179
180	if (is_client_expired(clp))
181	return nfserr_expired;
182	atomic_inc(v: &clp->cl_rpc_users);
183	nfsd4_dec_courtesy_client_count(nn, clp);
184	clp->cl_state = NFSD4_ACTIVE;
185	return nfs_ok;
186	}
187
188	/* must be called under the client_lock */
189	static inline void
190	renew_client_locked(struct nfs4_client *clp)
191	{
192	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
193
194	if (is_client_expired(clp)) {
195	WARN_ON(1);
196	printk("%s: client (clientid %08x/%08x) already expired\n",
197	__func__,
198	clp->cl_clientid.cl_boot,
199	clp->cl_clientid.cl_id);
200	return;
201	}
202
203	list_move_tail(list: &clp->cl_lru, head: &nn->client_lru);
204	clp->cl_time = ktime_get_boottime_seconds();
205	nfsd4_dec_courtesy_client_count(nn, clp);
206	clp->cl_state = NFSD4_ACTIVE;
207	}
208
209	static void put_client_renew_locked(struct nfs4_client *clp)
210	{
211	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
212
213	lockdep_assert_held(&nn->client_lock);
214
215	if (!atomic_dec_and_test(v: &clp->cl_rpc_users))
216	return;
217	if (!is_client_expired(clp))
218	renew_client_locked(clp);
219	else
220	wake_up_all(&expiry_wq);
221	}
222
223	static void put_client_renew(struct nfs4_client *clp)
224	{
225	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
226
227	if (!atomic_dec_and_lock(&clp->cl_rpc_users, &nn->client_lock))
228	return;
229	if (!is_client_expired(clp))
230	renew_client_locked(clp);
231	else
232	wake_up_all(&expiry_wq);
233	spin_unlock(lock: &nn->client_lock);
234	}
235
236	static __be32 nfsd4_get_session_locked(struct nfsd4_session *ses)
237	{
238	__be32 status;
239
240	if (is_session_dead(ses))
241	return nfserr_badsession;
242	status = get_client_locked(clp: ses->se_client);
243	if (status)
244	return status;
245	atomic_inc(v: &ses->se_ref);
246	return nfs_ok;
247	}
248
249	static void nfsd4_put_session_locked(struct nfsd4_session *ses)
250	{
251	struct nfs4_client *clp = ses->se_client;
252	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
253
254	lockdep_assert_held(&nn->client_lock);
255
256	if (atomic_dec_and_test(v: &ses->se_ref) && is_session_dead(ses))
257	free_session(ses);
258	put_client_renew_locked(clp);
259	}
260
261	static void nfsd4_put_session(struct nfsd4_session *ses)
262	{
263	struct nfs4_client *clp = ses->se_client;
264	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
265
266	spin_lock(lock: &nn->client_lock);
267	nfsd4_put_session_locked(ses);
268	spin_unlock(lock: &nn->client_lock);
269	}
270
271	static struct nfsd4_blocked_lock *
272	find_blocked_lock(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
273	struct nfsd_net *nn)
274	{
275	struct nfsd4_blocked_lock *cur, *found = NULL;
276
277	spin_lock(lock: &nn->blocked_locks_lock);
278	list_for_each_entry(cur, &lo->lo_blocked, nbl_list) {
279	if (fh_match(fh1: fh, fh2: &cur->nbl_fh)) {
280	list_del_init(entry: &cur->nbl_list);
281	WARN_ON(list_empty(&cur->nbl_lru));
282	list_del_init(entry: &cur->nbl_lru);
283	found = cur;
284	break;
285	}
286	}
287	spin_unlock(lock: &nn->blocked_locks_lock);
288	if (found)
289	locks_delete_block(&found->nbl_lock);
290	return found;
291	}
292
293	static struct nfsd4_blocked_lock *
294	find_or_allocate_block(struct nfs4_lockowner *lo, struct knfsd_fh *fh,
295	struct nfsd_net *nn)
296	{
297	struct nfsd4_blocked_lock *nbl;
298
299	nbl = find_blocked_lock(lo, fh, nn);
300	if (!nbl) {
301	nbl = kmalloc(size: sizeof(*nbl), GFP_KERNEL);
302	if (nbl) {
303	INIT_LIST_HEAD(list: &nbl->nbl_list);
304	INIT_LIST_HEAD(list: &nbl->nbl_lru);
305	fh_copy_shallow(dst: &nbl->nbl_fh, src: fh);
306	locks_init_lock(&nbl->nbl_lock);
307	kref_init(kref: &nbl->nbl_kref);
308	nfsd4_init_cb(cb: &nbl->nbl_cb, clp: lo->lo_owner.so_client,
309	ops: &nfsd4_cb_notify_lock_ops,
310	op: NFSPROC4_CLNT_CB_NOTIFY_LOCK);
311	}
312	}
313	return nbl;
314	}
315
316	static void
317	free_nbl(struct kref *kref)
318	{
319	struct nfsd4_blocked_lock *nbl;
320
321	nbl = container_of(kref, struct nfsd4_blocked_lock, nbl_kref);
322	kfree(objp: nbl);
323	}
324
325	static void
326	free_blocked_lock(struct nfsd4_blocked_lock *nbl)
327	{
328	locks_delete_block(&nbl->nbl_lock);
329	locks_release_private(&nbl->nbl_lock);
330	kref_put(kref: &nbl->nbl_kref, release: free_nbl);
331	}
332
333	static void
334	remove_blocked_locks(struct nfs4_lockowner *lo)
335	{
336	struct nfs4_client *clp = lo->lo_owner.so_client;
337	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
338	struct nfsd4_blocked_lock *nbl;
339	LIST_HEAD(reaplist);
340
341	/* Dequeue all blocked locks */
342	spin_lock(lock: &nn->blocked_locks_lock);
343	while (!list_empty(head: &lo->lo_blocked)) {
344	nbl = list_first_entry(&lo->lo_blocked,
345	struct nfsd4_blocked_lock,
346	nbl_list);
347	list_del_init(entry: &nbl->nbl_list);
348	WARN_ON(list_empty(&nbl->nbl_lru));
349	list_move(list: &nbl->nbl_lru, head: &reaplist);
350	}
351	spin_unlock(lock: &nn->blocked_locks_lock);
352
353	/* Now free them */
354	while (!list_empty(head: &reaplist)) {
355	nbl = list_first_entry(&reaplist, struct nfsd4_blocked_lock,
356	nbl_lru);
357	list_del_init(entry: &nbl->nbl_lru);
358	free_blocked_lock(nbl);
359	}
360	}
361
362	static void
363	nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb)
364	{
365	struct nfsd4_blocked_lock *nbl = container_of(cb,
366	struct nfsd4_blocked_lock, nbl_cb);
367	locks_delete_block(&nbl->nbl_lock);
368	}
369
370	static int
371	nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task)
372	{
373	trace_nfsd_cb_notify_lock_done(stp: &zero_stateid, task);
374
375	/*
376	* Since this is just an optimization, we don't try very hard if it
377	* turns out not to succeed. We'll requeue it on NFS4ERR_DELAY, and
378	* just quit trying on anything else.
379	*/
380	switch (task->tk_status) {
381	case -NFS4ERR_DELAY:
382	rpc_delay(task, 1 * HZ);
383	return 0;
384	default:
385	return 1;
386	}
387	}
388
389	static void
390	nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb)
391	{
392	struct nfsd4_blocked_lock *nbl = container_of(cb,
393	struct nfsd4_blocked_lock, nbl_cb);
394
395	free_blocked_lock(nbl);
396	}
397
398	static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = {
399	.prepare = nfsd4_cb_notify_lock_prepare,
400	.done = nfsd4_cb_notify_lock_done,
401	.release = nfsd4_cb_notify_lock_release,
402	};
403
404	/*
405	* We store the NONE, READ, WRITE, and BOTH bits separately in the
406	* st_{access,deny}_bmap field of the stateid, in order to track not
407	* only what share bits are currently in force, but also what
408	* combinations of share bits previous opens have used. This allows us
409	* to enforce the recommendation in
410	* https://datatracker.ietf.org/doc/html/rfc7530#section-16.19.4 that
411	* the server return an error if the client attempt to downgrade to a
412	* combination of share bits not explicable by closing some of its
413	* previous opens.
414	*
415	* This enforcement is arguably incomplete, since we don't keep
416	* track of access/deny bit combinations; so, e.g., we allow:
417	*
418	* OPEN allow read, deny write
419	* OPEN allow both, deny none
420	* DOWNGRADE allow read, deny none
421	*
422	* which we should reject.
423	*
424	* But you could also argue that our current code is already overkill,
425	* since it only exists to return NFS4ERR_INVAL on incorrect client
426	* behavior.
427	*/
428	static unsigned int
429	bmap_to_share_mode(unsigned long bmap)
430	{
431	int i;
432	unsigned int access = 0;
433
434	for (i = 1; i < 4; i++) {
435	if (test_bit(i, &bmap))
436	access |= i;
437	}
438	return access;
439	}
440
441	/* set share access for a given stateid */
442	static inline void
443	set_access(u32 access, struct nfs4_ol_stateid *stp)
444	{
445	unsigned char mask = 1 << access;
446
447	WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
448	stp->st_access_bmap |= mask;
449	}
450
451	/* clear share access for a given stateid */
452	static inline void
453	clear_access(u32 access, struct nfs4_ol_stateid *stp)
454	{
455	unsigned char mask = 1 << access;
456
457	WARN_ON_ONCE(access > NFS4_SHARE_ACCESS_BOTH);
458	stp->st_access_bmap &= ~mask;
459	}
460
461	/* test whether a given stateid has access */
462	static inline bool
463	test_access(u32 access, struct nfs4_ol_stateid *stp)
464	{
465	unsigned char mask = 1 << access;
466
467	return (bool)(stp->st_access_bmap & mask);
468	}
469
470	/* set share deny for a given stateid */
471	static inline void
472	set_deny(u32 deny, struct nfs4_ol_stateid *stp)
473	{
474	unsigned char mask = 1 << deny;
475
476	WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
477	stp->st_deny_bmap |= mask;
478	}
479
480	/* clear share deny for a given stateid */
481	static inline void
482	clear_deny(u32 deny, struct nfs4_ol_stateid *stp)
483	{
484	unsigned char mask = 1 << deny;
485
486	WARN_ON_ONCE(deny > NFS4_SHARE_DENY_BOTH);
487	stp->st_deny_bmap &= ~mask;
488	}
489
490	/* test whether a given stateid is denying specific access */
491	static inline bool
492	test_deny(u32 deny, struct nfs4_ol_stateid *stp)
493	{
494	unsigned char mask = 1 << deny;
495
496	return (bool)(stp->st_deny_bmap & mask);
497	}
498
499	static int nfs4_access_to_omode(u32 access)
500	{
501	switch (access & NFS4_SHARE_ACCESS_BOTH) {
502	case NFS4_SHARE_ACCESS_READ:
503	return O_RDONLY;
504	case NFS4_SHARE_ACCESS_WRITE:
505	return O_WRONLY;
506	case NFS4_SHARE_ACCESS_BOTH:
507	return O_RDWR;
508	}
509	WARN_ON_ONCE(1);
510	return O_RDONLY;
511	}
512
513	static inline int
514	access_permit_read(struct nfs4_ol_stateid *stp)
515	{
516	return test_access(NFS4_SHARE_ACCESS_READ, stp) ||
517	test_access(NFS4_SHARE_ACCESS_BOTH, stp) ||
518	test_access(NFS4_SHARE_ACCESS_WRITE, stp);
519	}
520
521	static inline int
522	access_permit_write(struct nfs4_ol_stateid *stp)
523	{
524	return test_access(NFS4_SHARE_ACCESS_WRITE, stp) ||
525	test_access(NFS4_SHARE_ACCESS_BOTH, stp);
526	}
527
528	static inline struct nfs4_stateowner *
529	nfs4_get_stateowner(struct nfs4_stateowner *sop)
530	{
531	atomic_inc(v: &sop->so_count);
532	return sop;
533	}
534
535	static int
536	same_owner_str(struct nfs4_stateowner *sop, struct xdr_netobj *owner)
537	{
538	return (sop->so_owner.len == owner->len) &&
539	0 == memcmp(p: sop->so_owner.data, q: owner->data, size: owner->len);
540	}
541
542	static struct nfs4_openowner *
543	find_openstateowner_str_locked(unsigned int hashval, struct nfsd4_open *open,
544	struct nfs4_client *clp)
545	{
546	struct nfs4_stateowner *so;
547
548	lockdep_assert_held(&clp->cl_lock);
549
550	list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[hashval],
551	so_strhash) {
552	if (!so->so_is_open_owner)
553	continue;
554	if (same_owner_str(sop: so, owner: &open->op_owner))
555	return openowner(so: nfs4_get_stateowner(sop: so));
556	}
557	return NULL;
558	}
559
560	static struct nfs4_openowner *
561	find_openstateowner_str(unsigned int hashval, struct nfsd4_open *open,
562	struct nfs4_client *clp)
563	{
564	struct nfs4_openowner *oo;
565
566	spin_lock(lock: &clp->cl_lock);
567	oo = find_openstateowner_str_locked(hashval, open, clp);
568	spin_unlock(lock: &clp->cl_lock);
569	return oo;
570	}
571
572	static inline u32
573	opaque_hashval(const void *ptr, int nbytes)
574	{
575	unsigned char *cptr = (unsigned char *) ptr;
576
577	u32 x = 0;
578	while (nbytes--) {
579	x *= 37;
580	x += *cptr++;
581	}
582	return x;
583	}
584
585	static void nfsd4_free_file_rcu(struct rcu_head *rcu)
586	{
587	struct nfs4_file *fp = container_of(rcu, struct nfs4_file, fi_rcu);
588
589	kmem_cache_free(s: file_slab, objp: fp);
590	}
591
592	void
593	put_nfs4_file(struct nfs4_file *fi)
594	{
595	if (refcount_dec_and_test(r: &fi->fi_ref)) {
596	nfsd4_file_hash_remove(fi);
597	WARN_ON_ONCE(!list_empty(&fi->fi_clnt_odstate));
598	WARN_ON_ONCE(!list_empty(&fi->fi_delegations));
599	call_rcu(head: &fi->fi_rcu, func: nfsd4_free_file_rcu);
600	}
601	}
602
603	static struct nfsd_file *
604	find_writeable_file_locked(struct nfs4_file *f)
605	{
606	struct nfsd_file *ret;
607
608	lockdep_assert_held(&f->fi_lock);
609
610	ret = nfsd_file_get(nf: f->fi_fds[O_WRONLY]);
611	if (!ret)
612	ret = nfsd_file_get(nf: f->fi_fds[O_RDWR]);
613	return ret;
614	}
615
616	static struct nfsd_file *
617	find_writeable_file(struct nfs4_file *f)
618	{
619	struct nfsd_file *ret;
620
621	spin_lock(lock: &f->fi_lock);
622	ret = find_writeable_file_locked(f);
623	spin_unlock(lock: &f->fi_lock);
624
625	return ret;
626	}
627
628	static struct nfsd_file *
629	find_readable_file_locked(struct nfs4_file *f)
630	{
631	struct nfsd_file *ret;
632
633	lockdep_assert_held(&f->fi_lock);
634
635	ret = nfsd_file_get(nf: f->fi_fds[O_RDONLY]);
636	if (!ret)
637	ret = nfsd_file_get(nf: f->fi_fds[O_RDWR]);
638	return ret;
639	}
640
641	static struct nfsd_file *
642	find_readable_file(struct nfs4_file *f)
643	{
644	struct nfsd_file *ret;
645
646	spin_lock(lock: &f->fi_lock);
647	ret = find_readable_file_locked(f);
648	spin_unlock(lock: &f->fi_lock);
649
650	return ret;
651	}
652
653	static struct nfsd_file *
654	find_rw_file(struct nfs4_file *f)
655	{
656	struct nfsd_file *ret;
657
658	spin_lock(lock: &f->fi_lock);
659	ret = nfsd_file_get(nf: f->fi_fds[O_RDWR]);
660	spin_unlock(lock: &f->fi_lock);
661
662	return ret;
663	}
664
665	struct nfsd_file *
666	find_any_file(struct nfs4_file *f)
667	{
668	struct nfsd_file *ret;
669
670	if (!f)
671	return NULL;
672	spin_lock(lock: &f->fi_lock);
673	ret = nfsd_file_get(nf: f->fi_fds[O_RDWR]);
674	if (!ret) {
675	ret = nfsd_file_get(nf: f->fi_fds[O_WRONLY]);
676	if (!ret)
677	ret = nfsd_file_get(nf: f->fi_fds[O_RDONLY]);
678	}
679	spin_unlock(lock: &f->fi_lock);
680	return ret;
681	}
682
683	static struct nfsd_file *find_any_file_locked(struct nfs4_file *f)
684	{
685	lockdep_assert_held(&f->fi_lock);
686
687	if (f->fi_fds[O_RDWR])
688	return f->fi_fds[O_RDWR];
689	if (f->fi_fds[O_WRONLY])
690	return f->fi_fds[O_WRONLY];
691	if (f->fi_fds[O_RDONLY])
692	return f->fi_fds[O_RDONLY];
693	return NULL;
694	}
695
696	static atomic_long_t num_delegations;
697	unsigned long max_delegations;
698
699	/*
700	* Open owner state (share locks)
701	*/
702
703	/* hash tables for lock and open owners */
704	#define OWNER_HASH_BITS 8
705	#define OWNER_HASH_SIZE (1 << OWNER_HASH_BITS)
706	#define OWNER_HASH_MASK (OWNER_HASH_SIZE - 1)
707
708	static unsigned int ownerstr_hashval(struct xdr_netobj *ownername)
709	{
710	unsigned int ret;
711
712	ret = opaque_hashval(ptr: ownername->data, nbytes: ownername->len);
713	return ret & OWNER_HASH_MASK;
714	}
715
716	static struct rhltable nfs4_file_rhltable ____cacheline_aligned_in_smp;
717
718	static const struct rhashtable_params nfs4_file_rhash_params = {
719	.key_len = sizeof_field(struct nfs4_file, fi_inode),
720	.key_offset = offsetof(struct nfs4_file, fi_inode),
721	.head_offset = offsetof(struct nfs4_file, fi_rlist),
722
723	/*
724	* Start with a single page hash table to reduce resizing churn
725	* on light workloads.
726	*/
727	.min_size = 256,
728	.automatic_shrinking = true,
729	};
730
731	/*
732	* Check if courtesy clients have conflicting access and resolve it if possible
733	*
734	* access: is op_share_access if share_access is true.
735	* Check if access mode, op_share_access, would conflict with
736	* the current deny mode of the file 'fp'.
737	* access: is op_share_deny if share_access is false.
738	* Check if the deny mode, op_share_deny, would conflict with
739	* current access of the file 'fp'.
740	* stp: skip checking this entry.
741	* new_stp: normal open, not open upgrade.
742	*
743	* Function returns:
744	* false - access/deny mode conflict with normal client.
745	* true - no conflict or conflict with courtesy client(s) is resolved.
746	*/
747	static bool
748	nfs4_resolve_deny_conflicts_locked(struct nfs4_file *fp, bool new_stp,
749	struct nfs4_ol_stateid *stp, u32 access, bool share_access)
750	{
751	struct nfs4_ol_stateid *st;
752	bool resolvable = true;
753	unsigned char bmap;
754	struct nfsd_net *nn;
755	struct nfs4_client *clp;
756
757	lockdep_assert_held(&fp->fi_lock);
758	list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
759	/* ignore lock stateid */
760	if (st->st_openstp)
761	continue;
762	if (st == stp && new_stp)
763	continue;
764	/* check file access against deny mode or vice versa */
765	bmap = share_access ? st->st_deny_bmap : st->st_access_bmap;
766	if (!(access & bmap_to_share_mode(bmap)))
767	continue;
768	clp = st->st_stid.sc_client;
769	if (try_to_expire_client(clp))
770	continue;
771	resolvable = false;
772	break;
773	}
774	if (resolvable) {
775	clp = stp->st_stid.sc_client;
776	nn = net_generic(net: clp->net, id: nfsd_net_id);
777	mod_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: 0);
778	}
779	return resolvable;
780	}
781
782	static void
783	__nfs4_file_get_access(struct nfs4_file *fp, u32 access)
784	{
785	lockdep_assert_held(&fp->fi_lock);
786
787	if (access & NFS4_SHARE_ACCESS_WRITE)
788	atomic_inc(v: &fp->fi_access[O_WRONLY]);
789	if (access & NFS4_SHARE_ACCESS_READ)
790	atomic_inc(v: &fp->fi_access[O_RDONLY]);
791	}
792
793	static __be32
794	nfs4_file_get_access(struct nfs4_file *fp, u32 access)
795	{
796	lockdep_assert_held(&fp->fi_lock);
797
798	/* Does this access mode make sense? */
799	if (access & ~NFS4_SHARE_ACCESS_BOTH)
800	return nfserr_inval;
801
802	/* Does it conflict with a deny mode already set? */
803	if ((access & fp->fi_share_deny) != 0)
804	return nfserr_share_denied;
805
806	__nfs4_file_get_access(fp, access);
807	return nfs_ok;
808	}
809
810	static __be32 nfs4_file_check_deny(struct nfs4_file *fp, u32 deny)
811	{
812	/* Common case is that there is no deny mode. */
813	if (deny) {
814	/* Does this deny mode make sense? */
815	if (deny & ~NFS4_SHARE_DENY_BOTH)
816	return nfserr_inval;
817
818	if ((deny & NFS4_SHARE_DENY_READ) &&
819	atomic_read(v: &fp->fi_access[O_RDONLY]))
820	return nfserr_share_denied;
821
822	if ((deny & NFS4_SHARE_DENY_WRITE) &&
823	atomic_read(v: &fp->fi_access[O_WRONLY]))
824	return nfserr_share_denied;
825	}
826	return nfs_ok;
827	}
828
829	static void __nfs4_file_put_access(struct nfs4_file *fp, int oflag)
830	{
831	might_lock(&fp->fi_lock);
832
833	if (atomic_dec_and_lock(&fp->fi_access[oflag], &fp->fi_lock)) {
834	struct nfsd_file *f1 = NULL;
835	struct nfsd_file *f2 = NULL;
836
837	swap(f1, fp->fi_fds[oflag]);
838	if (atomic_read(v: &fp->fi_access[1 - oflag]) == 0)
839	swap(f2, fp->fi_fds[O_RDWR]);
840	spin_unlock(lock: &fp->fi_lock);
841	if (f1)
842	nfsd_file_put(nf: f1);
843	if (f2)
844	nfsd_file_put(nf: f2);
845	}
846	}
847
848	static void nfs4_file_put_access(struct nfs4_file *fp, u32 access)
849	{
850	WARN_ON_ONCE(access & ~NFS4_SHARE_ACCESS_BOTH);
851
852	if (access & NFS4_SHARE_ACCESS_WRITE)
853	__nfs4_file_put_access(fp, O_WRONLY);
854	if (access & NFS4_SHARE_ACCESS_READ)
855	__nfs4_file_put_access(fp, O_RDONLY);
856	}
857
858	/*
859	* Allocate a new open/delegation state counter. This is needed for
860	* pNFS for proper return on close semantics.
861	*
862	* Note that we only allocate it for pNFS-enabled exports, otherwise
863	* all pointers to struct nfs4_clnt_odstate are always NULL.
864	*/
865	static struct nfs4_clnt_odstate *
866	alloc_clnt_odstate(struct nfs4_client *clp)
867	{
868	struct nfs4_clnt_odstate *co;
869
870	co = kmem_cache_zalloc(k: odstate_slab, GFP_KERNEL);
871	if (co) {
872	co->co_client = clp;
873	refcount_set(r: &co->co_odcount, n: 1);
874	}
875	return co;
876	}
877
878	static void
879	hash_clnt_odstate_locked(struct nfs4_clnt_odstate *co)
880	{
881	struct nfs4_file *fp = co->co_file;
882
883	lockdep_assert_held(&fp->fi_lock);
884	list_add(new: &co->co_perfile, head: &fp->fi_clnt_odstate);
885	}
886
887	static inline void
888	get_clnt_odstate(struct nfs4_clnt_odstate *co)
889	{
890	if (co)
891	refcount_inc(r: &co->co_odcount);
892	}
893
894	static void
895	put_clnt_odstate(struct nfs4_clnt_odstate *co)
896	{
897	struct nfs4_file *fp;
898
899	if (!co)
900	return;
901
902	fp = co->co_file;
903	if (refcount_dec_and_lock(r: &co->co_odcount, lock: &fp->fi_lock)) {
904	list_del(entry: &co->co_perfile);
905	spin_unlock(lock: &fp->fi_lock);
906
907	nfsd4_return_all_file_layouts(clp: co->co_client, fp);
908	kmem_cache_free(s: odstate_slab, objp: co);
909	}
910	}
911
912	static struct nfs4_clnt_odstate *
913	find_or_hash_clnt_odstate(struct nfs4_file *fp, struct nfs4_clnt_odstate *new)
914	{
915	struct nfs4_clnt_odstate *co;
916	struct nfs4_client *cl;
917
918	if (!new)
919	return NULL;
920
921	cl = new->co_client;
922
923	spin_lock(lock: &fp->fi_lock);
924	list_for_each_entry(co, &fp->fi_clnt_odstate, co_perfile) {
925	if (co->co_client == cl) {
926	get_clnt_odstate(co);
927	goto out;
928	}
929	}
930	co = new;
931	co->co_file = fp;
932	hash_clnt_odstate_locked(co: new);
933	out:
934	spin_unlock(lock: &fp->fi_lock);
935	return co;
936	}
937
938	struct nfs4_stid *nfs4_alloc_stid(struct nfs4_client *cl, struct kmem_cache *slab,
939	void (*sc_free)(struct nfs4_stid *))
940	{
941	struct nfs4_stid *stid;
942	int new_id;
943
944	stid = kmem_cache_zalloc(k: slab, GFP_KERNEL);
945	if (!stid)
946	return NULL;
947
948	idr_preload(GFP_KERNEL);
949	spin_lock(lock: &cl->cl_lock);
950	/* Reserving 0 for start of file in nfsdfs "states" file: */
951	new_id = idr_alloc_cyclic(&cl->cl_stateids, ptr: stid, start: 1, end: 0, GFP_NOWAIT);
952	spin_unlock(lock: &cl->cl_lock);
953	idr_preload_end();
954	if (new_id < 0)
955	goto out_free;
956
957	stid->sc_free = sc_free;
958	stid->sc_client = cl;
959	stid->sc_stateid.si_opaque.so_id = new_id;
960	stid->sc_stateid.si_opaque.so_clid = cl->cl_clientid;
961	/* Will be incremented before return to client: */
962	refcount_set(r: &stid->sc_count, n: 1);
963	spin_lock_init(&stid->sc_lock);
964	INIT_LIST_HEAD(list: &stid->sc_cp_list);
965
966	/*
967	* It shouldn't be a problem to reuse an opaque stateid value.
968	* I don't think it is for 4.1. But with 4.0 I worry that, for
969	* example, a stray write retransmission could be accepted by
970	* the server when it should have been rejected. Therefore,
971	* adopt a trick from the sctp code to attempt to maximize the
972	* amount of time until an id is reused, by ensuring they always
973	* "increase" (mod INT_MAX):
974	*/
975	return stid;
976	out_free:
977	kmem_cache_free(s: slab, objp: stid);
978	return NULL;
979	}
980
981	/*
982	* Create a unique stateid_t to represent each COPY.
983	*/
984	static int nfs4_init_cp_state(struct nfsd_net *nn, copy_stateid_t *stid,
985	unsigned char cs_type)
986	{
987	int new_id;
988
989	stid->cs_stid.si_opaque.so_clid.cl_boot = (u32)nn->boot_time;
990	stid->cs_stid.si_opaque.so_clid.cl_id = nn->s2s_cp_cl_id;
991
992	idr_preload(GFP_KERNEL);
993	spin_lock(lock: &nn->s2s_cp_lock);
994	new_id = idr_alloc_cyclic(&nn->s2s_cp_stateids, ptr: stid, start: 0, end: 0, GFP_NOWAIT);
995	stid->cs_stid.si_opaque.so_id = new_id;
996	stid->cs_stid.si_generation = 1;
997	spin_unlock(lock: &nn->s2s_cp_lock);
998	idr_preload_end();
999	if (new_id < 0)
1000	return 0;
1001	stid->cs_type = cs_type;
1002	return 1;
1003	}
1004
1005	int nfs4_init_copy_state(struct nfsd_net *nn, struct nfsd4_copy *copy)
1006	{
1007	return nfs4_init_cp_state(nn, stid: &copy->cp_stateid, NFS4_COPY_STID);
1008	}
1009
1010	struct nfs4_cpntf_state *nfs4_alloc_init_cpntf_state(struct nfsd_net *nn,
1011	struct nfs4_stid *p_stid)
1012	{
1013	struct nfs4_cpntf_state *cps;
1014
1015	cps = kzalloc(size: sizeof(struct nfs4_cpntf_state), GFP_KERNEL);
1016	if (!cps)
1017	return NULL;
1018	cps->cpntf_time = ktime_get_boottime_seconds();
1019	refcount_set(r: &cps->cp_stateid.cs_count, n: 1);
1020	if (!nfs4_init_cp_state(nn, stid: &cps->cp_stateid, NFS4_COPYNOTIFY_STID))
1021	goto out_free;
1022	spin_lock(lock: &nn->s2s_cp_lock);
1023	list_add(new: &cps->cp_list, head: &p_stid->sc_cp_list);
1024	spin_unlock(lock: &nn->s2s_cp_lock);
1025	return cps;
1026	out_free:
1027	kfree(objp: cps);
1028	return NULL;
1029	}
1030
1031	void nfs4_free_copy_state(struct nfsd4_copy *copy)
1032	{
1033	struct nfsd_net *nn;
1034
1035	if (copy->cp_stateid.cs_type != NFS4_COPY_STID)
1036	return;
1037	nn = net_generic(net: copy->cp_clp->net, id: nfsd_net_id);
1038	spin_lock(lock: &nn->s2s_cp_lock);
1039	idr_remove(&nn->s2s_cp_stateids,
1040	id: copy->cp_stateid.cs_stid.si_opaque.so_id);
1041	spin_unlock(lock: &nn->s2s_cp_lock);
1042	}
1043
1044	static void nfs4_free_cpntf_statelist(struct net *net, struct nfs4_stid *stid)
1045	{
1046	struct nfs4_cpntf_state *cps;
1047	struct nfsd_net *nn;
1048
1049	nn = net_generic(net, id: nfsd_net_id);
1050	spin_lock(lock: &nn->s2s_cp_lock);
1051	while (!list_empty(head: &stid->sc_cp_list)) {
1052	cps = list_first_entry(&stid->sc_cp_list,
1053	struct nfs4_cpntf_state, cp_list);
1054	_free_cpntf_state_locked(nn, cps);
1055	}
1056	spin_unlock(lock: &nn->s2s_cp_lock);
1057	}
1058
1059	static struct nfs4_ol_stateid * nfs4_alloc_open_stateid(struct nfs4_client *clp)
1060	{
1061	struct nfs4_stid *stid;
1062
1063	stid = nfs4_alloc_stid(cl: clp, slab: stateid_slab, sc_free: nfs4_free_ol_stateid);
1064	if (!stid)
1065	return NULL;
1066
1067	return openlockstateid(s: stid);
1068	}
1069
1070	static void nfs4_free_deleg(struct nfs4_stid *stid)
1071	{
1072	struct nfs4_delegation *dp = delegstateid(s: stid);
1073
1074	WARN_ON_ONCE(!list_empty(&stid->sc_cp_list));
1075	WARN_ON_ONCE(!list_empty(&dp->dl_perfile));
1076	WARN_ON_ONCE(!list_empty(&dp->dl_perclnt));
1077	WARN_ON_ONCE(!list_empty(&dp->dl_recall_lru));
1078	kmem_cache_free(s: deleg_slab, objp: stid);
1079	atomic_long_dec(v: &num_delegations);
1080	}
1081
1082	/*
1083	* When we recall a delegation, we should be careful not to hand it
1084	* out again straight away.
1085	* To ensure this we keep a pair of bloom filters ('new' and 'old')
1086	* in which the filehandles of recalled delegations are "stored".
1087	* If a filehandle appear in either filter, a delegation is blocked.
1088	* When a delegation is recalled, the filehandle is stored in the "new"
1089	* filter.
1090	* Every 30 seconds we swap the filters and clear the "new" one,
1091	* unless both are empty of course.
1092	*
1093	* Each filter is 256 bits. We hash the filehandle to 32bit and use the
1094	* low 3 bytes as hash-table indices.
1095	*
1096	* 'blocked_delegations_lock', which is always taken in block_delegations(),
1097	* is used to manage concurrent access. Testing does not need the lock
1098	* except when swapping the two filters.
1099	*/
1100	static DEFINE_SPINLOCK(blocked_delegations_lock);
1101	static struct bloom_pair {
1102	int entries, old_entries;
1103	time64_t swap_time;
1104	int new; /* index into 'set' */
1105	DECLARE_BITMAP(set[2], 256);
1106	} blocked_delegations;
1107
1108	static int delegation_blocked(struct knfsd_fh *fh)
1109	{
1110	u32 hash;
1111	struct bloom_pair *bd = &blocked_delegations;
1112
1113	if (bd->entries == 0)
1114	return 0;
1115	if (ktime_get_seconds() - bd->swap_time > 30) {
1116	spin_lock(lock: &blocked_delegations_lock);
1117	if (ktime_get_seconds() - bd->swap_time > 30) {
1118	bd->entries -= bd->old_entries;
1119	bd->old_entries = bd->entries;
1120	memset(bd->set[bd->new], 0,
1121	sizeof(bd->set[0]));
1122	bd->new = 1-bd->new;
1123	bd->swap_time = ktime_get_seconds();
1124	}
1125	spin_unlock(lock: &blocked_delegations_lock);
1126	}
1127	hash = jhash(key: &fh->fh_raw, length: fh->fh_size, initval: 0);
1128	if (test_bit(hash&255, bd->set[0]) &&
1129	test_bit((hash>>8)&255, bd->set[0]) &&
1130	test_bit((hash>>16)&255, bd->set[0]))
1131	return 1;
1132
1133	if (test_bit(hash&255, bd->set[1]) &&
1134	test_bit((hash>>8)&255, bd->set[1]) &&
1135	test_bit((hash>>16)&255, bd->set[1]))
1136	return 1;
1137
1138	return 0;
1139	}
1140
1141	static void block_delegations(struct knfsd_fh *fh)
1142	{
1143	u32 hash;
1144	struct bloom_pair *bd = &blocked_delegations;
1145
1146	hash = jhash(key: &fh->fh_raw, length: fh->fh_size, initval: 0);
1147
1148	spin_lock(lock: &blocked_delegations_lock);
1149	__set_bit(hash&255, bd->set[bd->new]);
1150	__set_bit((hash>>8)&255, bd->set[bd->new]);
1151	__set_bit((hash>>16)&255, bd->set[bd->new]);
1152	if (bd->entries == 0)
1153	bd->swap_time = ktime_get_seconds();
1154	bd->entries += 1;
1155	spin_unlock(lock: &blocked_delegations_lock);
1156	}
1157
1158	static struct nfs4_delegation *
1159	alloc_init_deleg(struct nfs4_client *clp, struct nfs4_file *fp,
1160	struct nfs4_clnt_odstate *odstate, u32 dl_type)
1161	{
1162	struct nfs4_delegation *dp;
1163	struct nfs4_stid *stid;
1164	long n;
1165
1166	dprintk("NFSD alloc_init_deleg\n");
1167	n = atomic_long_inc_return(v: &num_delegations);
1168	if (n < 0 || n > max_delegations)
1169	goto out_dec;
1170	if (delegation_blocked(fh: &fp->fi_fhandle))
1171	goto out_dec;
1172	stid = nfs4_alloc_stid(cl: clp, slab: deleg_slab, sc_free: nfs4_free_deleg);
1173	if (stid == NULL)
1174	goto out_dec;
1175	dp = delegstateid(s: stid);
1176
1177	/*
1178	* delegation seqid's are never incremented. The 4.1 special
1179	* meaning of seqid 0 isn't meaningful, really, but let's avoid
1180	* 0 anyway just for consistency and use 1:
1181	*/
1182	dp->dl_stid.sc_stateid.si_generation = 1;
1183	INIT_LIST_HEAD(list: &dp->dl_perfile);
1184	INIT_LIST_HEAD(list: &dp->dl_perclnt);
1185	INIT_LIST_HEAD(list: &dp->dl_recall_lru);
1186	dp->dl_clnt_odstate = odstate;
1187	get_clnt_odstate(co: odstate);
1188	dp->dl_type = dl_type;
1189	dp->dl_retries = 1;
1190	dp->dl_recalled = false;
1191	nfsd4_init_cb(cb: &dp->dl_recall, clp: dp->dl_stid.sc_client,
1192	ops: &nfsd4_cb_recall_ops, op: NFSPROC4_CLNT_CB_RECALL);
1193	nfsd4_init_cb(cb: &dp->dl_cb_fattr.ncf_getattr, clp: dp->dl_stid.sc_client,
1194	ops: &nfsd4_cb_getattr_ops, op: NFSPROC4_CLNT_CB_GETATTR);
1195	dp->dl_cb_fattr.ncf_file_modified = false;
1196	dp->dl_cb_fattr.ncf_cb_bmap[0] = FATTR4_WORD0_CHANGE | FATTR4_WORD0_SIZE;
1197	get_nfs4_file(fi: fp);
1198	dp->dl_stid.sc_file = fp;
1199	return dp;
1200	out_dec:
1201	atomic_long_dec(v: &num_delegations);
1202	return NULL;
1203	}
1204
1205	void
1206	nfs4_put_stid(struct nfs4_stid *s)
1207	{
1208	struct nfs4_file *fp = s->sc_file;
1209	struct nfs4_client *clp = s->sc_client;
1210
1211	might_lock(&clp->cl_lock);
1212
1213	if (!refcount_dec_and_lock(r: &s->sc_count, lock: &clp->cl_lock)) {
1214	wake_up_all(&close_wq);
1215	return;
1216	}
1217	idr_remove(&clp->cl_stateids, id: s->sc_stateid.si_opaque.so_id);
1218	nfs4_free_cpntf_statelist(net: clp->net, stid: s);
1219	spin_unlock(lock: &clp->cl_lock);
1220	s->sc_free(s);
1221	if (fp)
1222	put_nfs4_file(fi: fp);
1223	}
1224
1225	void
1226	nfs4_inc_and_copy_stateid(stateid_t *dst, struct nfs4_stid *stid)
1227	{
1228	stateid_t *src = &stid->sc_stateid;
1229
1230	spin_lock(lock: &stid->sc_lock);
1231	if (unlikely(++src->si_generation == 0))
1232	src->si_generation = 1;
1233	memcpy(dst, src, sizeof(*dst));
1234	spin_unlock(lock: &stid->sc_lock);
1235	}
1236
1237	static void put_deleg_file(struct nfs4_file *fp)
1238	{
1239	struct nfsd_file *nf = NULL;
1240
1241	spin_lock(lock: &fp->fi_lock);
1242	if (--fp->fi_delegees == 0)
1243	swap(nf, fp->fi_deleg_file);
1244	spin_unlock(lock: &fp->fi_lock);
1245
1246	if (nf)
1247	nfsd_file_put(nf);
1248	}
1249
1250	static void nfs4_unlock_deleg_lease(struct nfs4_delegation *dp)
1251	{
1252	struct nfs4_file *fp = dp->dl_stid.sc_file;
1253	struct nfsd_file *nf = fp->fi_deleg_file;
1254
1255	WARN_ON_ONCE(!fp->fi_delegees);
1256
1257	vfs_setlease(nf->nf_file, F_UNLCK, NULL, (void **)&dp);
1258	put_deleg_file(fp);
1259	}
1260
1261	static void destroy_unhashed_deleg(struct nfs4_delegation *dp)
1262	{
1263	put_clnt_odstate(co: dp->dl_clnt_odstate);
1264	nfs4_unlock_deleg_lease(dp);
1265	nfs4_put_stid(s: &dp->dl_stid);
1266	}
1267
1268	void nfs4_unhash_stid(struct nfs4_stid *s)
1269	{
1270	s->sc_type = 0;
1271	}
1272
1273	/**
1274	* nfs4_delegation_exists - Discover if this delegation already exists
1275	* @clp: a pointer to the nfs4_client we're granting a delegation to
1276	* @fp: a pointer to the nfs4_file we're granting a delegation on
1277	*
1278	* Return:
1279	* On success: true iff an existing delegation is found
1280	*/
1281
1282	static bool
1283	nfs4_delegation_exists(struct nfs4_client *clp, struct nfs4_file *fp)
1284	{
1285	struct nfs4_delegation *searchdp = NULL;
1286	struct nfs4_client *searchclp = NULL;
1287
1288	lockdep_assert_held(&state_lock);
1289	lockdep_assert_held(&fp->fi_lock);
1290
1291	list_for_each_entry(searchdp, &fp->fi_delegations, dl_perfile) {
1292	searchclp = searchdp->dl_stid.sc_client;
1293	if (clp == searchclp) {
1294	return true;
1295	}
1296	}
1297	return false;
1298	}
1299
1300	/**
1301	* hash_delegation_locked - Add a delegation to the appropriate lists
1302	* @dp: a pointer to the nfs4_delegation we are adding.
1303	* @fp: a pointer to the nfs4_file we're granting a delegation on
1304	*
1305	* Return:
1306	* On success: NULL if the delegation was successfully hashed.
1307	*
1308	* On error: -EAGAIN if one was previously granted to this
1309	* nfs4_client for this nfs4_file. Delegation is not hashed.
1310	*
1311	*/
1312
1313	static int
1314	hash_delegation_locked(struct nfs4_delegation *dp, struct nfs4_file *fp)
1315	{
1316	struct nfs4_client *clp = dp->dl_stid.sc_client;
1317
1318	lockdep_assert_held(&state_lock);
1319	lockdep_assert_held(&fp->fi_lock);
1320
1321	if (nfs4_delegation_exists(clp, fp))
1322	return -EAGAIN;
1323	refcount_inc(r: &dp->dl_stid.sc_count);
1324	dp->dl_stid.sc_type = NFS4_DELEG_STID;
1325	list_add(new: &dp->dl_perfile, head: &fp->fi_delegations);
1326	list_add(new: &dp->dl_perclnt, head: &clp->cl_delegations);
1327	return 0;
1328	}
1329
1330	static bool delegation_hashed(struct nfs4_delegation *dp)
1331	{
1332	return !(list_empty(head: &dp->dl_perfile));
1333	}
1334
1335	static bool
1336	unhash_delegation_locked(struct nfs4_delegation *dp)
1337	{
1338	struct nfs4_file *fp = dp->dl_stid.sc_file;
1339
1340	lockdep_assert_held(&state_lock);
1341
1342	if (!delegation_hashed(dp))
1343	return false;
1344
1345	dp->dl_stid.sc_type = NFS4_CLOSED_DELEG_STID;
1346	/* Ensure that deleg break won't try to requeue it */
1347	++dp->dl_time;
1348	spin_lock(lock: &fp->fi_lock);
1349	list_del_init(entry: &dp->dl_perclnt);
1350	list_del_init(entry: &dp->dl_recall_lru);
1351	list_del_init(entry: &dp->dl_perfile);
1352	spin_unlock(lock: &fp->fi_lock);
1353	return true;
1354	}
1355
1356	static void destroy_delegation(struct nfs4_delegation *dp)
1357	{
1358	bool unhashed;
1359
1360	spin_lock(lock: &state_lock);
1361	unhashed = unhash_delegation_locked(dp);
1362	spin_unlock(lock: &state_lock);
1363	if (unhashed)
1364	destroy_unhashed_deleg(dp);
1365	}
1366
1367	static void revoke_delegation(struct nfs4_delegation *dp)
1368	{
1369	struct nfs4_client *clp = dp->dl_stid.sc_client;
1370
1371	WARN_ON(!list_empty(&dp->dl_recall_lru));
1372
1373	trace_nfsd_stid_revoke(stid: &dp->dl_stid);
1374
1375	if (clp->cl_minorversion) {
1376	spin_lock(lock: &clp->cl_lock);
1377	dp->dl_stid.sc_type = NFS4_REVOKED_DELEG_STID;
1378	refcount_inc(r: &dp->dl_stid.sc_count);
1379	list_add(new: &dp->dl_recall_lru, head: &clp->cl_revoked);
1380	spin_unlock(lock: &clp->cl_lock);
1381	}
1382	destroy_unhashed_deleg(dp);
1383	}
1384
1385	/*
1386	* SETCLIENTID state
1387	*/
1388
1389	static unsigned int clientid_hashval(u32 id)
1390	{
1391	return id & CLIENT_HASH_MASK;
1392	}
1393
1394	static unsigned int clientstr_hashval(struct xdr_netobj name)
1395	{
1396	return opaque_hashval(ptr: name.data, nbytes: 8) & CLIENT_HASH_MASK;
1397	}
1398
1399	/*
1400	* A stateid that had a deny mode associated with it is being released
1401	* or downgraded. Recalculate the deny mode on the file.
1402	*/
1403	static void
1404	recalculate_deny_mode(struct nfs4_file *fp)
1405	{
1406	struct nfs4_ol_stateid *stp;
1407
1408	spin_lock(lock: &fp->fi_lock);
1409	fp->fi_share_deny = 0;
1410	list_for_each_entry(stp, &fp->fi_stateids, st_perfile)
1411	fp->fi_share_deny |= bmap_to_share_mode(bmap: stp->st_deny_bmap);
1412	spin_unlock(lock: &fp->fi_lock);
1413	}
1414
1415	static void
1416	reset_union_bmap_deny(u32 deny, struct nfs4_ol_stateid *stp)
1417	{
1418	int i;
1419	bool change = false;
1420
1421	for (i = 1; i < 4; i++) {
1422	if ((i & deny) != i) {
1423	change = true;
1424	clear_deny(deny: i, stp);
1425	}
1426	}
1427
1428	/* Recalculate per-file deny mode if there was a change */
1429	if (change)
1430	recalculate_deny_mode(fp: stp->st_stid.sc_file);
1431	}
1432
1433	/* release all access and file references for a given stateid */
1434	static void
1435	release_all_access(struct nfs4_ol_stateid *stp)
1436	{
1437	int i;
1438	struct nfs4_file *fp = stp->st_stid.sc_file;
1439
1440	if (fp && stp->st_deny_bmap != 0)
1441	recalculate_deny_mode(fp);
1442
1443	for (i = 1; i < 4; i++) {
1444	if (test_access(access: i, stp))
1445	nfs4_file_put_access(fp: stp->st_stid.sc_file, access: i);
1446	clear_access(access: i, stp);
1447	}
1448	}
1449
1450	static inline void nfs4_free_stateowner(struct nfs4_stateowner *sop)
1451	{
1452	kfree(objp: sop->so_owner.data);
1453	sop->so_ops->so_free(sop);
1454	}
1455
1456	static void nfs4_put_stateowner(struct nfs4_stateowner *sop)
1457	{
1458	struct nfs4_client *clp = sop->so_client;
1459
1460	might_lock(&clp->cl_lock);
1461
1462	if (!atomic_dec_and_lock(&sop->so_count, &clp->cl_lock))
1463	return;
1464	sop->so_ops->so_unhash(sop);
1465	spin_unlock(lock: &clp->cl_lock);
1466	nfs4_free_stateowner(sop);
1467	}
1468
1469	static bool
1470	nfs4_ol_stateid_unhashed(const struct nfs4_ol_stateid *stp)
1471	{
1472	return list_empty(head: &stp->st_perfile);
1473	}
1474
1475	static bool unhash_ol_stateid(struct nfs4_ol_stateid *stp)
1476	{
1477	struct nfs4_file *fp = stp->st_stid.sc_file;
1478
1479	lockdep_assert_held(&stp->st_stateowner->so_client->cl_lock);
1480
1481	if (list_empty(head: &stp->st_perfile))
1482	return false;
1483
1484	spin_lock(lock: &fp->fi_lock);
1485	list_del_init(entry: &stp->st_perfile);
1486	spin_unlock(lock: &fp->fi_lock);
1487	list_del(entry: &stp->st_perstateowner);
1488	return true;
1489	}
1490
1491	static void nfs4_free_ol_stateid(struct nfs4_stid *stid)
1492	{
1493	struct nfs4_ol_stateid *stp = openlockstateid(s: stid);
1494
1495	put_clnt_odstate(co: stp->st_clnt_odstate);
1496	release_all_access(stp);
1497	if (stp->st_stateowner)
1498	nfs4_put_stateowner(sop: stp->st_stateowner);
1499	WARN_ON(!list_empty(&stid->sc_cp_list));
1500	kmem_cache_free(s: stateid_slab, objp: stid);
1501	}
1502
1503	static void nfs4_free_lock_stateid(struct nfs4_stid *stid)
1504	{
1505	struct nfs4_ol_stateid *stp = openlockstateid(s: stid);
1506	struct nfs4_lockowner *lo = lockowner(so: stp->st_stateowner);
1507	struct nfsd_file *nf;
1508
1509	nf = find_any_file(f: stp->st_stid.sc_file);
1510	if (nf) {
1511	get_file(f: nf->nf_file);
1512	filp_close(nf->nf_file, id: (fl_owner_t)lo);
1513	nfsd_file_put(nf);
1514	}
1515	nfs4_free_ol_stateid(stid);
1516	}
1517
1518	/*
1519	* Put the persistent reference to an already unhashed generic stateid, while
1520	* holding the cl_lock. If it's the last reference, then put it onto the
1521	* reaplist for later destruction.
1522	*/
1523	static void put_ol_stateid_locked(struct nfs4_ol_stateid *stp,
1524	struct list_head *reaplist)
1525	{
1526	struct nfs4_stid *s = &stp->st_stid;
1527	struct nfs4_client *clp = s->sc_client;
1528
1529	lockdep_assert_held(&clp->cl_lock);
1530
1531	WARN_ON_ONCE(!list_empty(&stp->st_locks));
1532
1533	if (!refcount_dec_and_test(r: &s->sc_count)) {
1534	wake_up_all(&close_wq);
1535	return;
1536	}
1537
1538	idr_remove(&clp->cl_stateids, id: s->sc_stateid.si_opaque.so_id);
1539	list_add(new: &stp->st_locks, head: reaplist);
1540	}
1541
1542	static bool unhash_lock_stateid(struct nfs4_ol_stateid *stp)
1543	{
1544	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1545
1546	if (!unhash_ol_stateid(stp))
1547	return false;
1548	list_del_init(entry: &stp->st_locks);
1549	nfs4_unhash_stid(s: &stp->st_stid);
1550	return true;
1551	}
1552
1553	static void release_lock_stateid(struct nfs4_ol_stateid *stp)
1554	{
1555	struct nfs4_client *clp = stp->st_stid.sc_client;
1556	bool unhashed;
1557
1558	spin_lock(lock: &clp->cl_lock);
1559	unhashed = unhash_lock_stateid(stp);
1560	spin_unlock(lock: &clp->cl_lock);
1561	if (unhashed)
1562	nfs4_put_stid(s: &stp->st_stid);
1563	}
1564
1565	static void unhash_lockowner_locked(struct nfs4_lockowner *lo)
1566	{
1567	struct nfs4_client *clp = lo->lo_owner.so_client;
1568
1569	lockdep_assert_held(&clp->cl_lock);
1570
1571	list_del_init(entry: &lo->lo_owner.so_strhash);
1572	}
1573
1574	/*
1575	* Free a list of generic stateids that were collected earlier after being
1576	* fully unhashed.
1577	*/
1578	static void
1579	free_ol_stateid_reaplist(struct list_head *reaplist)
1580	{
1581	struct nfs4_ol_stateid *stp;
1582	struct nfs4_file *fp;
1583
1584	might_sleep();
1585
1586	while (!list_empty(head: reaplist)) {
1587	stp = list_first_entry(reaplist, struct nfs4_ol_stateid,
1588	st_locks);
1589	list_del(entry: &stp->st_locks);
1590	fp = stp->st_stid.sc_file;
1591	stp->st_stid.sc_free(&stp->st_stid);
1592	if (fp)
1593	put_nfs4_file(fi: fp);
1594	}
1595	}
1596
1597	static void release_open_stateid_locks(struct nfs4_ol_stateid *open_stp,
1598	struct list_head *reaplist)
1599	{
1600	struct nfs4_ol_stateid *stp;
1601
1602	lockdep_assert_held(&open_stp->st_stid.sc_client->cl_lock);
1603
1604	while (!list_empty(head: &open_stp->st_locks)) {
1605	stp = list_entry(open_stp->st_locks.next,
1606	struct nfs4_ol_stateid, st_locks);
1607	WARN_ON(!unhash_lock_stateid(stp));
1608	put_ol_stateid_locked(stp, reaplist);
1609	}
1610	}
1611
1612	static bool unhash_open_stateid(struct nfs4_ol_stateid *stp,
1613	struct list_head *reaplist)
1614	{
1615	lockdep_assert_held(&stp->st_stid.sc_client->cl_lock);
1616
1617	if (!unhash_ol_stateid(stp))
1618	return false;
1619	release_open_stateid_locks(open_stp: stp, reaplist);
1620	return true;
1621	}
1622
1623	static void release_open_stateid(struct nfs4_ol_stateid *stp)
1624	{
1625	LIST_HEAD(reaplist);
1626
1627	spin_lock(lock: &stp->st_stid.sc_client->cl_lock);
1628	if (unhash_open_stateid(stp, reaplist: &reaplist))
1629	put_ol_stateid_locked(stp, reaplist: &reaplist);
1630	spin_unlock(lock: &stp->st_stid.sc_client->cl_lock);
1631	free_ol_stateid_reaplist(reaplist: &reaplist);
1632	}
1633
1634	static void unhash_openowner_locked(struct nfs4_openowner *oo)
1635	{
1636	struct nfs4_client *clp = oo->oo_owner.so_client;
1637
1638	lockdep_assert_held(&clp->cl_lock);
1639
1640	list_del_init(entry: &oo->oo_owner.so_strhash);
1641	list_del_init(entry: &oo->oo_perclient);
1642	}
1643
1644	static void release_last_closed_stateid(struct nfs4_openowner *oo)
1645	{
1646	struct nfsd_net *nn = net_generic(net: oo->oo_owner.so_client->net,
1647	id: nfsd_net_id);
1648	struct nfs4_ol_stateid *s;
1649
1650	spin_lock(lock: &nn->client_lock);
1651	s = oo->oo_last_closed_stid;
1652	if (s) {
1653	list_del_init(entry: &oo->oo_close_lru);
1654	oo->oo_last_closed_stid = NULL;
1655	}
1656	spin_unlock(lock: &nn->client_lock);
1657	if (s)
1658	nfs4_put_stid(s: &s->st_stid);
1659	}
1660
1661	static void release_openowner(struct nfs4_openowner *oo)
1662	{
1663	struct nfs4_ol_stateid *stp;
1664	struct nfs4_client *clp = oo->oo_owner.so_client;
1665	struct list_head reaplist;
1666
1667	INIT_LIST_HEAD(list: &reaplist);
1668
1669	spin_lock(lock: &clp->cl_lock);
1670	unhash_openowner_locked(oo);
1671	while (!list_empty(head: &oo->oo_owner.so_stateids)) {
1672	stp = list_first_entry(&oo->oo_owner.so_stateids,
1673	struct nfs4_ol_stateid, st_perstateowner);
1674	if (unhash_open_stateid(stp, reaplist: &reaplist))
1675	put_ol_stateid_locked(stp, reaplist: &reaplist);
1676	}
1677	spin_unlock(lock: &clp->cl_lock);
1678	free_ol_stateid_reaplist(reaplist: &reaplist);
1679	release_last_closed_stateid(oo);
1680	nfs4_put_stateowner(sop: &oo->oo_owner);
1681	}
1682
1683	static inline int
1684	hash_sessionid(struct nfs4_sessionid *sessionid)
1685	{
1686	struct nfsd4_sessionid *sid = (struct nfsd4_sessionid *)sessionid;
1687
1688	return sid->sequence % SESSION_HASH_SIZE;
1689	}
1690
1691	#ifdef CONFIG_SUNRPC_DEBUG
1692	static inline void
1693	dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1694	{
1695	u32 *ptr = (u32 *)(&sessionid->data[0]);
1696	dprintk("%s: %u:%u:%u:%u\n", fn, ptr[0], ptr[1], ptr[2], ptr[3]);
1697	}
1698	#else
1699	static inline void
1700	dump_sessionid(const char *fn, struct nfs4_sessionid *sessionid)
1701	{
1702	}
1703	#endif
1704
1705	/*
1706	* Bump the seqid on cstate->replay_owner, and clear replay_owner if it
1707	* won't be used for replay.
1708	*/
1709	void nfsd4_bump_seqid(struct nfsd4_compound_state *cstate, __be32 nfserr)
1710	{
1711	struct nfs4_stateowner *so = cstate->replay_owner;
1712
1713	if (nfserr == nfserr_replay_me)
1714	return;
1715
1716	if (!seqid_mutating_err(ntohl(nfserr))) {
1717	nfsd4_cstate_clear_replay(cstate);
1718	return;
1719	}
1720	if (!so)
1721	return;
1722	if (so->so_is_open_owner)
1723	release_last_closed_stateid(oo: openowner(so));
1724	so->so_seqid++;
1725	return;
1726	}
1727
1728	static void
1729	gen_sessionid(struct nfsd4_session *ses)
1730	{
1731	struct nfs4_client *clp = ses->se_client;
1732	struct nfsd4_sessionid *sid;
1733
1734	sid = (struct nfsd4_sessionid *)ses->se_sessionid.data;
1735	sid->clientid = clp->cl_clientid;
1736	sid->sequence = current_sessionid++;
1737	sid->reserved = 0;
1738	}
1739
1740	/*
1741	* The protocol defines ca_maxresponssize_cached to include the size of
1742	* the rpc header, but all we need to cache is the data starting after
1743	* the end of the initial SEQUENCE operation--the rest we regenerate
1744	* each time. Therefore we can advertise a ca_maxresponssize_cached
1745	* value that is the number of bytes in our cache plus a few additional
1746	* bytes. In order to stay on the safe side, and not promise more than
1747	* we can cache, those additional bytes must be the minimum possible: 24
1748	* bytes of rpc header (xid through accept state, with AUTH_NULL
1749	* verifier), 12 for the compound header (with zero-length tag), and 44
1750	* for the SEQUENCE op response:
1751	*/
1752	#define NFSD_MIN_HDR_SEQ_SZ (24 + 12 + 44)
1753
1754	static void
1755	free_session_slots(struct nfsd4_session *ses)
1756	{
1757	int i;
1758
1759	for (i = 0; i < ses->se_fchannel.maxreqs; i++) {
1760	free_svc_cred(cred: &ses->se_slots[i]->sl_cred);
1761	kfree(objp: ses->se_slots[i]);
1762	}
1763	}
1764
1765	/*
1766	* We don't actually need to cache the rpc and session headers, so we
1767	* can allocate a little less for each slot:
1768	*/
1769	static inline u32 slot_bytes(struct nfsd4_channel_attrs *ca)
1770	{
1771	u32 size;
1772
1773	if (ca->maxresp_cached < NFSD_MIN_HDR_SEQ_SZ)
1774	size = 0;
1775	else
1776	size = ca->maxresp_cached - NFSD_MIN_HDR_SEQ_SZ;
1777	return size + sizeof(struct nfsd4_slot);
1778	}
1779
1780	/*
1781	* XXX: If we run out of reserved DRC memory we could (up to a point)
1782	* re-negotiate active sessions and reduce their slot usage to make
1783	* room for new connections. For now we just fail the create session.
1784	*/
1785	static u32 nfsd4_get_drc_mem(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
1786	{
1787	u32 slotsize = slot_bytes(ca);
1788	u32 num = ca->maxreqs;
1789	unsigned long avail, total_avail;
1790	unsigned int scale_factor;
1791
1792	spin_lock(lock: &nfsd_drc_lock);
1793	if (nfsd_drc_max_mem > nfsd_drc_mem_used)
1794	total_avail = nfsd_drc_max_mem - nfsd_drc_mem_used;
1795	else
1796	/* We have handed out more space than we chose in
1797	* set_max_drc() to allow. That isn't really a
1798	* problem as long as that doesn't make us think we
1799	* have lots more due to integer overflow.
1800	*/
1801	total_avail = 0;
1802	avail = min((unsigned long)NFSD_MAX_MEM_PER_SESSION, total_avail);
1803	/*
1804	* Never use more than a fraction of the remaining memory,
1805	* unless it's the only way to give this client a slot.
1806	* The chosen fraction is either 1/8 or 1/number of threads,
1807	* whichever is smaller. This ensures there are adequate
1808	* slots to support multiple clients per thread.
1809	* Give the client one slot even if that would require
1810	* over-allocation--it is better than failure.
1811	*/
1812	scale_factor = max_t(unsigned int, 8, nn->nfsd_serv->sv_nrthreads);
1813
1814	avail = clamp_t(unsigned long, avail, slotsize,
1815	total_avail/scale_factor);
1816	num = min_t(int, num, avail / slotsize);
1817	num = max_t(int, num, 1);
1818	nfsd_drc_mem_used += num * slotsize;
1819	spin_unlock(lock: &nfsd_drc_lock);
1820
1821	return num;
1822	}
1823
1824	static void nfsd4_put_drc_mem(struct nfsd4_channel_attrs *ca)
1825	{
1826	int slotsize = slot_bytes(ca);
1827
1828	spin_lock(lock: &nfsd_drc_lock);
1829	nfsd_drc_mem_used -= slotsize * ca->maxreqs;
1830	spin_unlock(lock: &nfsd_drc_lock);
1831	}
1832
1833	static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fattrs,
1834	struct nfsd4_channel_attrs *battrs)
1835	{
1836	int numslots = fattrs->maxreqs;
1837	int slotsize = slot_bytes(ca: fattrs);
1838	struct nfsd4_session *new;
1839	int i;
1840
1841	BUILD_BUG_ON(struct_size(new, se_slots, NFSD_MAX_SLOTS_PER_SESSION)
1842	> PAGE_SIZE);
1843
1844	new = kzalloc(struct_size(new, se_slots, numslots), GFP_KERNEL);
1845	if (!new)
1846	return NULL;
1847	/* allocate each struct nfsd4_slot and data cache in one piece */
1848	for (i = 0; i < numslots; i++) {
1849	new->se_slots[i] = kzalloc(size: slotsize, GFP_KERNEL);
1850	if (!new->se_slots[i])
1851	goto out_free;
1852	}
1853
1854	memcpy(&new->se_fchannel, fattrs, sizeof(struct nfsd4_channel_attrs));
1855	memcpy(&new->se_bchannel, battrs, sizeof(struct nfsd4_channel_attrs));
1856
1857	return new;
1858	out_free:
1859	while (i--)
1860	kfree(objp: new->se_slots[i]);
1861	kfree(objp: new);
1862	return NULL;
1863	}
1864
1865	static void free_conn(struct nfsd4_conn *c)
1866	{
1867	svc_xprt_put(xprt: c->cn_xprt);
1868	kfree(objp: c);
1869	}
1870
1871	static void nfsd4_conn_lost(struct svc_xpt_user *u)
1872	{
1873	struct nfsd4_conn *c = container_of(u, struct nfsd4_conn, cn_xpt_user);
1874	struct nfs4_client *clp = c->cn_session->se_client;
1875
1876	trace_nfsd_cb_lost(clp);
1877
1878	spin_lock(lock: &clp->cl_lock);
1879	if (!list_empty(head: &c->cn_persession)) {
1880	list_del(entry: &c->cn_persession);
1881	free_conn(c);
1882	}
1883	nfsd4_probe_callback(clp);
1884	spin_unlock(lock: &clp->cl_lock);
1885	}
1886
1887	static struct nfsd4_conn *alloc_conn(struct svc_rqst *rqstp, u32 flags)
1888	{
1889	struct nfsd4_conn *conn;
1890
1891	conn = kmalloc(size: sizeof(struct nfsd4_conn), GFP_KERNEL);
1892	if (!conn)
1893	return NULL;
1894	svc_xprt_get(xprt: rqstp->rq_xprt);
1895	conn->cn_xprt = rqstp->rq_xprt;
1896	conn->cn_flags = flags;
1897	INIT_LIST_HEAD(list: &conn->cn_xpt_user.list);
1898	return conn;
1899	}
1900
1901	static void __nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1902	{
1903	conn->cn_session = ses;
1904	list_add(new: &conn->cn_persession, head: &ses->se_conns);
1905	}
1906
1907	static void nfsd4_hash_conn(struct nfsd4_conn *conn, struct nfsd4_session *ses)
1908	{
1909	struct nfs4_client *clp = ses->se_client;
1910
1911	spin_lock(lock: &clp->cl_lock);
1912	__nfsd4_hash_conn(conn, ses);
1913	spin_unlock(lock: &clp->cl_lock);
1914	}
1915
1916	static int nfsd4_register_conn(struct nfsd4_conn *conn)
1917	{
1918	conn->cn_xpt_user.callback = nfsd4_conn_lost;
1919	return register_xpt_user(xpt: conn->cn_xprt, u: &conn->cn_xpt_user);
1920	}
1921
1922	static void nfsd4_init_conn(struct svc_rqst *rqstp, struct nfsd4_conn *conn, struct nfsd4_session *ses)
1923	{
1924	int ret;
1925
1926	nfsd4_hash_conn(conn, ses);
1927	ret = nfsd4_register_conn(conn);
1928	if (ret)
1929	/* oops; xprt is already down: */
1930	nfsd4_conn_lost(u: &conn->cn_xpt_user);
1931	/* We may have gained or lost a callback channel: */
1932	nfsd4_probe_callback_sync(clp: ses->se_client);
1933	}
1934
1935	static struct nfsd4_conn *alloc_conn_from_crses(struct svc_rqst *rqstp, struct nfsd4_create_session *cses)
1936	{
1937	u32 dir = NFS4_CDFC4_FORE;
1938
1939	if (cses->flags & SESSION4_BACK_CHAN)
1940	dir |= NFS4_CDFC4_BACK;
1941	return alloc_conn(rqstp, flags: dir);
1942	}
1943
1944	/* must be called under client_lock */
1945	static void nfsd4_del_conns(struct nfsd4_session *s)
1946	{
1947	struct nfs4_client *clp = s->se_client;
1948	struct nfsd4_conn *c;
1949
1950	spin_lock(lock: &clp->cl_lock);
1951	while (!list_empty(head: &s->se_conns)) {
1952	c = list_first_entry(&s->se_conns, struct nfsd4_conn, cn_persession);
1953	list_del_init(entry: &c->cn_persession);
1954	spin_unlock(lock: &clp->cl_lock);
1955
1956	unregister_xpt_user(xpt: c->cn_xprt, u: &c->cn_xpt_user);
1957	free_conn(c);
1958
1959	spin_lock(lock: &clp->cl_lock);
1960	}
1961	spin_unlock(lock: &clp->cl_lock);
1962	}
1963
1964	static void __free_session(struct nfsd4_session *ses)
1965	{
1966	free_session_slots(ses);
1967	kfree(objp: ses);
1968	}
1969
1970	static void free_session(struct nfsd4_session *ses)
1971	{
1972	nfsd4_del_conns(s: ses);
1973	nfsd4_put_drc_mem(ca: &ses->se_fchannel);
1974	__free_session(ses);
1975	}
1976
1977	static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
1978	{
1979	int idx;
1980	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
1981
1982	new->se_client = clp;
1983	gen_sessionid(ses: new);
1984
1985	INIT_LIST_HEAD(list: &new->se_conns);
1986
1987	new->se_cb_seq_nr = 1;
1988	new->se_flags = cses->flags;
1989	new->se_cb_prog = cses->callback_prog;
1990	new->se_cb_sec = cses->cb_sec;
1991	atomic_set(v: &new->se_ref, i: 0);
1992	idx = hash_sessionid(sessionid: &new->se_sessionid);
1993	list_add(new: &new->se_hash, head: &nn->sessionid_hashtbl[idx]);
1994	spin_lock(lock: &clp->cl_lock);
1995	list_add(new: &new->se_perclnt, head: &clp->cl_sessions);
1996	spin_unlock(lock: &clp->cl_lock);
1997
1998	{
1999	struct sockaddr *sa = svc_addr(rqst: rqstp);
2000	/*
2001	* This is a little silly; with sessions there's no real
2002	* use for the callback address. Use the peer address
2003	* as a reasonable default for now, but consider fixing
2004	* the rpc client not to require an address in the
2005	* future:
2006	*/
2007	rpc_copy_addr(dst: (struct sockaddr *)&clp->cl_cb_conn.cb_addr, src: sa);
2008	clp->cl_cb_conn.cb_addrlen = svc_addr_len(sa);
2009	}
2010	}
2011
2012	/* caller must hold client_lock */
2013	static struct nfsd4_session *
2014	__find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
2015	{
2016	struct nfsd4_session *elem;
2017	int idx;
2018	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
2019
2020	lockdep_assert_held(&nn->client_lock);
2021
2022	dump_sessionid(fn: __func__, sessionid);
2023	idx = hash_sessionid(sessionid);
2024	/* Search in the appropriate list */
2025	list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
2026	if (!memcmp(p: elem->se_sessionid.data, q: sessionid->data,
2027	NFS4_MAX_SESSIONID_LEN)) {
2028	return elem;
2029	}
2030	}
2031
2032	dprintk("%s: session not found\n", __func__);
2033	return NULL;
2034	}
2035
2036	static struct nfsd4_session *
2037	find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net,
2038	__be32 *ret)
2039	{
2040	struct nfsd4_session *session;
2041	__be32 status = nfserr_badsession;
2042
2043	session = __find_in_sessionid_hashtbl(sessionid, net);
2044	if (!session)
2045	goto out;
2046	status = nfsd4_get_session_locked(ses: session);
2047	if (status)
2048	session = NULL;
2049	out:
2050	*ret = status;
2051	return session;
2052	}
2053
2054	/* caller must hold client_lock */
2055	static void
2056	unhash_session(struct nfsd4_session *ses)
2057	{
2058	struct nfs4_client *clp = ses->se_client;
2059	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2060
2061	lockdep_assert_held(&nn->client_lock);
2062
2063	list_del(entry: &ses->se_hash);
2064	spin_lock(lock: &ses->se_client->cl_lock);
2065	list_del(entry: &ses->se_perclnt);
2066	spin_unlock(lock: &ses->se_client->cl_lock);
2067	}
2068
2069	/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
2070	static int
2071	STALE_CLIENTID(clientid_t *clid, struct nfsd_net *nn)
2072	{
2073	/*
2074	* We're assuming the clid was not given out from a boot
2075	* precisely 2^32 (about 136 years) before this one. That seems
2076	* a safe assumption:
2077	*/
2078	if (clid->cl_boot == (u32)nn->boot_time)
2079	return 0;
2080	trace_nfsd_clid_stale(clid);
2081	return 1;
2082	}
2083
2084	/*
2085	* XXX Should we use a slab cache ?
2086	* This type of memory management is somewhat inefficient, but we use it
2087	* anyway since SETCLIENTID is not a common operation.
2088	*/
2089	static struct nfs4_client *alloc_client(struct xdr_netobj name,
2090	struct nfsd_net *nn)
2091	{
2092	struct nfs4_client *clp;
2093	int i;
2094
2095	if (atomic_read(v: &nn->nfs4_client_count) >= nn->nfs4_max_clients) {
2096	mod_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: 0);
2097	return NULL;
2098	}
2099	clp = kmem_cache_zalloc(k: client_slab, GFP_KERNEL);
2100	if (clp == NULL)
2101	return NULL;
2102	xdr_netobj_dup(dst: &clp->cl_name, src: &name, GFP_KERNEL);
2103	if (clp->cl_name.data == NULL)
2104	goto err_no_name;
2105	clp->cl_ownerstr_hashtbl = kmalloc_array(OWNER_HASH_SIZE,
2106	size: sizeof(struct list_head),
2107	GFP_KERNEL);
2108	if (!clp->cl_ownerstr_hashtbl)
2109	goto err_no_hashtbl;
2110	for (i = 0; i < OWNER_HASH_SIZE; i++)
2111	INIT_LIST_HEAD(list: &clp->cl_ownerstr_hashtbl[i]);
2112	INIT_LIST_HEAD(list: &clp->cl_sessions);
2113	idr_init(idr: &clp->cl_stateids);
2114	atomic_set(v: &clp->cl_rpc_users, i: 0);
2115	clp->cl_cb_state = NFSD4_CB_UNKNOWN;
2116	clp->cl_state = NFSD4_ACTIVE;
2117	atomic_inc(v: &nn->nfs4_client_count);
2118	atomic_set(v: &clp->cl_delegs_in_recall, i: 0);
2119	INIT_LIST_HEAD(list: &clp->cl_idhash);
2120	INIT_LIST_HEAD(list: &clp->cl_openowners);
2121	INIT_LIST_HEAD(list: &clp->cl_delegations);
2122	INIT_LIST_HEAD(list: &clp->cl_lru);
2123	INIT_LIST_HEAD(list: &clp->cl_revoked);
2124	#ifdef CONFIG_NFSD_PNFS
2125	INIT_LIST_HEAD(list: &clp->cl_lo_states);
2126	#endif
2127	INIT_LIST_HEAD(list: &clp->async_copies);
2128	spin_lock_init(&clp->async_lock);
2129	spin_lock_init(&clp->cl_lock);
2130	rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
2131	return clp;
2132	err_no_hashtbl:
2133	kfree(objp: clp->cl_name.data);
2134	err_no_name:
2135	kmem_cache_free(s: client_slab, objp: clp);
2136	return NULL;
2137	}
2138
2139	static void __free_client(struct kref *k)
2140	{
2141	struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
2142	struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
2143
2144	free_svc_cred(cred: &clp->cl_cred);
2145	kfree(objp: clp->cl_ownerstr_hashtbl);
2146	kfree(objp: clp->cl_name.data);
2147	kfree(objp: clp->cl_nii_domain.data);
2148	kfree(objp: clp->cl_nii_name.data);
2149	idr_destroy(&clp->cl_stateids);
2150	kfree(objp: clp->cl_ra);
2151	kmem_cache_free(s: client_slab, objp: clp);
2152	}
2153
2154	static void drop_client(struct nfs4_client *clp)
2155	{
2156	kref_put(kref: &clp->cl_nfsdfs.cl_ref, release: __free_client);
2157	}
2158
2159	static void
2160	free_client(struct nfs4_client *clp)
2161	{
2162	while (!list_empty(head: &clp->cl_sessions)) {
2163	struct nfsd4_session *ses;
2164	ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
2165	se_perclnt);
2166	list_del(entry: &ses->se_perclnt);
2167	WARN_ON_ONCE(atomic_read(&ses->se_ref));
2168	free_session(ses);
2169	}
2170	rpc_destroy_wait_queue(&clp->cl_cb_waitq);
2171	if (clp->cl_nfsd_dentry) {
2172	nfsd_client_rmdir(dentry: clp->cl_nfsd_dentry);
2173	clp->cl_nfsd_dentry = NULL;
2174	wake_up_all(&expiry_wq);
2175	}
2176	drop_client(clp);
2177	}
2178
2179	/* must be called under the client_lock */
2180	static void
2181	unhash_client_locked(struct nfs4_client *clp)
2182	{
2183	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2184	struct nfsd4_session *ses;
2185
2186	lockdep_assert_held(&nn->client_lock);
2187
2188	/* Mark the client as expired! */
2189	clp->cl_time = 0;
2190	/* Make it invisible */
2191	if (!list_empty(head: &clp->cl_idhash)) {
2192	list_del_init(entry: &clp->cl_idhash);
2193	if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2194	rb_erase(&clp->cl_namenode, &nn->conf_name_tree);
2195	else
2196	rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
2197	}
2198	list_del_init(entry: &clp->cl_lru);
2199	spin_lock(lock: &clp->cl_lock);
2200	list_for_each_entry(ses, &clp->cl_sessions, se_perclnt)
2201	list_del_init(entry: &ses->se_hash);
2202	spin_unlock(lock: &clp->cl_lock);
2203	}
2204
2205	static void
2206	unhash_client(struct nfs4_client *clp)
2207	{
2208	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2209
2210	spin_lock(lock: &nn->client_lock);
2211	unhash_client_locked(clp);
2212	spin_unlock(lock: &nn->client_lock);
2213	}
2214
2215	static __be32 mark_client_expired_locked(struct nfs4_client *clp)
2216	{
2217	if (atomic_read(v: &clp->cl_rpc_users))
2218	return nfserr_jukebox;
2219	unhash_client_locked(clp);
2220	return nfs_ok;
2221	}
2222
2223	static void
2224	__destroy_client(struct nfs4_client *clp)
2225	{
2226	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2227	int i;
2228	struct nfs4_openowner *oo;
2229	struct nfs4_delegation *dp;
2230	struct list_head reaplist;
2231
2232	INIT_LIST_HEAD(list: &reaplist);
2233	spin_lock(lock: &state_lock);
2234	while (!list_empty(head: &clp->cl_delegations)) {
2235	dp = list_entry(clp->cl_delegations.next, struct nfs4_delegation, dl_perclnt);
2236	WARN_ON(!unhash_delegation_locked(dp));
2237	list_add(new: &dp->dl_recall_lru, head: &reaplist);
2238	}
2239	spin_unlock(lock: &state_lock);
2240	while (!list_empty(head: &reaplist)) {
2241	dp = list_entry(reaplist.next, struct nfs4_delegation, dl_recall_lru);
2242	list_del_init(entry: &dp->dl_recall_lru);
2243	destroy_unhashed_deleg(dp);
2244	}
2245	while (!list_empty(head: &clp->cl_revoked)) {
2246	dp = list_entry(clp->cl_revoked.next, struct nfs4_delegation, dl_recall_lru);
2247	list_del_init(entry: &dp->dl_recall_lru);
2248	nfs4_put_stid(s: &dp->dl_stid);
2249	}
2250	while (!list_empty(head: &clp->cl_openowners)) {
2251	oo = list_entry(clp->cl_openowners.next, struct nfs4_openowner, oo_perclient);
2252	nfs4_get_stateowner(sop: &oo->oo_owner);
2253	release_openowner(oo);
2254	}
2255	for (i = 0; i < OWNER_HASH_SIZE; i++) {
2256	struct nfs4_stateowner *so, *tmp;
2257
2258	list_for_each_entry_safe(so, tmp, &clp->cl_ownerstr_hashtbl[i],
2259	so_strhash) {
2260	/* Should be no openowners at this point */
2261	WARN_ON_ONCE(so->so_is_open_owner);
2262	remove_blocked_locks(lo: lockowner(so));
2263	}
2264	}
2265	nfsd4_return_all_client_layouts(clp);
2266	nfsd4_shutdown_copy(clp);
2267	nfsd4_shutdown_callback(clp);
2268	if (clp->cl_cb_conn.cb_xprt)
2269	svc_xprt_put(xprt: clp->cl_cb_conn.cb_xprt);
2270	atomic_add_unless(v: &nn->nfs4_client_count, a: -1, u: 0);
2271	nfsd4_dec_courtesy_client_count(nn, clp);
2272	free_client(clp);
2273	wake_up_all(&expiry_wq);
2274	}
2275
2276	static void
2277	destroy_client(struct nfs4_client *clp)
2278	{
2279	unhash_client(clp);
2280	__destroy_client(clp);
2281	}
2282
2283	static void inc_reclaim_complete(struct nfs4_client *clp)
2284	{
2285	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2286
2287	if (!nn->track_reclaim_completes)
2288	return;
2289	if (!nfsd4_find_reclaim_client(name: clp->cl_name, nn))
2290	return;
2291	if (atomic_inc_return(v: &nn->nr_reclaim_complete) ==
2292	nn->reclaim_str_hashtbl_size) {
2293	printk(KERN_INFO "NFSD: all clients done reclaiming, ending NFSv4 grace period (net %x)\n",
2294	clp->net->ns.inum);
2295	nfsd4_end_grace(nn);
2296	}
2297	}
2298
2299	static void expire_client(struct nfs4_client *clp)
2300	{
2301	unhash_client(clp);
2302	nfsd4_client_record_remove(clp);
2303	__destroy_client(clp);
2304	}
2305
2306	static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
2307	{
2308	memcpy(target->cl_verifier.data, source->data,
2309	sizeof(target->cl_verifier.data));
2310	}
2311
2312	static void copy_clid(struct nfs4_client *target, struct nfs4_client *source)
2313	{
2314	target->cl_clientid.cl_boot = source->cl_clientid.cl_boot;
2315	target->cl_clientid.cl_id = source->cl_clientid.cl_id;
2316	}
2317
2318	static int copy_cred(struct svc_cred *target, struct svc_cred *source)
2319	{
2320	target->cr_principal = kstrdup(s: source->cr_principal, GFP_KERNEL);
2321	target->cr_raw_principal = kstrdup(s: source->cr_raw_principal,
2322	GFP_KERNEL);
2323	target->cr_targ_princ = kstrdup(s: source->cr_targ_princ, GFP_KERNEL);
2324	if ((source->cr_principal && !target->cr_principal) ||
2325	(source->cr_raw_principal && !target->cr_raw_principal) ||
2326	(source->cr_targ_princ && !target->cr_targ_princ))
2327	return -ENOMEM;
2328
2329	target->cr_flavor = source->cr_flavor;
2330	target->cr_uid = source->cr_uid;
2331	target->cr_gid = source->cr_gid;
2332	target->cr_group_info = source->cr_group_info;
2333	get_group_info(gi: target->cr_group_info);
2334	target->cr_gss_mech = source->cr_gss_mech;
2335	if (source->cr_gss_mech)
2336	gss_mech_get(source->cr_gss_mech);
2337	return 0;
2338	}
2339
2340	static int
2341	compare_blob(const struct xdr_netobj *o1, const struct xdr_netobj *o2)
2342	{
2343	if (o1->len < o2->len)
2344	return -1;
2345	if (o1->len > o2->len)
2346	return 1;
2347	return memcmp(p: o1->data, q: o2->data, size: o1->len);
2348	}
2349
2350	static int
2351	same_verf(nfs4_verifier *v1, nfs4_verifier *v2)
2352	{
2353	return 0 == memcmp(p: v1->data, q: v2->data, size: sizeof(v1->data));
2354	}
2355
2356	static int
2357	same_clid(clientid_t *cl1, clientid_t *cl2)
2358	{
2359	return (cl1->cl_boot == cl2->cl_boot) && (cl1->cl_id == cl2->cl_id);
2360	}
2361
2362	static bool groups_equal(struct group_info *g1, struct group_info *g2)
2363	{
2364	int i;
2365
2366	if (g1->ngroups != g2->ngroups)
2367	return false;
2368	for (i=0; i<g1->ngroups; i++)
2369	if (!gid_eq(left: g1->gid[i], right: g2->gid[i]))
2370	return false;
2371	return true;
2372	}
2373
2374	/*
2375	* RFC 3530 language requires clid_inuse be returned when the
2376	* "principal" associated with a requests differs from that previously
2377	* used. We use uid, gid's, and gss principal string as our best
2378	* approximation. We also don't want to allow non-gss use of a client
2379	* established using gss: in theory cr_principal should catch that
2380	* change, but in practice cr_principal can be null even in the gss case
2381	* since gssd doesn't always pass down a principal string.
2382	*/
2383	static bool is_gss_cred(struct svc_cred *cr)
2384	{
2385	/* Is cr_flavor one of the gss "pseudoflavors"?: */
2386	return (cr->cr_flavor > RPC_AUTH_MAXFLAVOR);
2387	}
2388
2389
2390	static bool
2391	same_creds(struct svc_cred *cr1, struct svc_cred *cr2)
2392	{
2393	if ((is_gss_cred(cr: cr1) != is_gss_cred(cr: cr2))
2394	|| (!uid_eq(left: cr1->cr_uid, right: cr2->cr_uid))
2395	|| (!gid_eq(left: cr1->cr_gid, right: cr2->cr_gid))
2396	|| !groups_equal(g1: cr1->cr_group_info, g2: cr2->cr_group_info))
2397	return false;
2398	/* XXX: check that cr_targ_princ fields match ? */
2399	if (cr1->cr_principal == cr2->cr_principal)
2400	return true;
2401	if (!cr1->cr_principal || !cr2->cr_principal)
2402	return false;
2403	return 0 == strcmp(cr1->cr_principal, cr2->cr_principal);
2404	}
2405
2406	static bool svc_rqst_integrity_protected(struct svc_rqst *rqstp)
2407	{
2408	struct svc_cred *cr = &rqstp->rq_cred;
2409	u32 service;
2410
2411	if (!cr->cr_gss_mech)
2412	return false;
2413	service = gss_pseudoflavor_to_service(cr->cr_gss_mech, pseudoflavor: cr->cr_flavor);
2414	return service == RPC_GSS_SVC_INTEGRITY ||
2415	service == RPC_GSS_SVC_PRIVACY;
2416	}
2417
2418	bool nfsd4_mach_creds_match(struct nfs4_client *cl, struct svc_rqst *rqstp)
2419	{
2420	struct svc_cred *cr = &rqstp->rq_cred;
2421
2422	if (!cl->cl_mach_cred)
2423	return true;
2424	if (cl->cl_cred.cr_gss_mech != cr->cr_gss_mech)
2425	return false;
2426	if (!svc_rqst_integrity_protected(rqstp))
2427	return false;
2428	if (cl->cl_cred.cr_raw_principal)
2429	return 0 == strcmp(cl->cl_cred.cr_raw_principal,
2430	cr->cr_raw_principal);
2431	if (!cr->cr_principal)
2432	return false;
2433	return 0 == strcmp(cl->cl_cred.cr_principal, cr->cr_principal);
2434	}
2435
2436	static void gen_confirm(struct nfs4_client *clp, struct nfsd_net *nn)
2437	{
2438	__be32 verf[2];
2439
2440	/*
2441	* This is opaque to client, so no need to byte-swap. Use
2442	* __force to keep sparse happy
2443	*/
2444	verf[0] = (__force __be32)(u32)ktime_get_real_seconds();
2445	verf[1] = (__force __be32)nn->clverifier_counter++;
2446	memcpy(clp->cl_confirm.data, verf, sizeof(clp->cl_confirm.data));
2447	}
2448
2449	static void gen_clid(struct nfs4_client *clp, struct nfsd_net *nn)
2450	{
2451	clp->cl_clientid.cl_boot = (u32)nn->boot_time;
2452	clp->cl_clientid.cl_id = nn->clientid_counter++;
2453	gen_confirm(clp, nn);
2454	}
2455
2456	static struct nfs4_stid *
2457	find_stateid_locked(struct nfs4_client *cl, stateid_t *t)
2458	{
2459	struct nfs4_stid *ret;
2460
2461	ret = idr_find(&cl->cl_stateids, id: t->si_opaque.so_id);
2462	if (!ret || !ret->sc_type)
2463	return NULL;
2464	return ret;
2465	}
2466
2467	static struct nfs4_stid *
2468	find_stateid_by_type(struct nfs4_client *cl, stateid_t *t, char typemask)
2469	{
2470	struct nfs4_stid *s;
2471
2472	spin_lock(lock: &cl->cl_lock);
2473	s = find_stateid_locked(cl, t);
2474	if (s != NULL) {
2475	if (typemask & s->sc_type)
2476	refcount_inc(r: &s->sc_count);
2477	else
2478	s = NULL;
2479	}
2480	spin_unlock(lock: &cl->cl_lock);
2481	return s;
2482	}
2483
2484	static struct nfs4_client *get_nfsdfs_clp(struct inode *inode)
2485	{
2486	struct nfsdfs_client *nc;
2487	nc = get_nfsdfs_client(inode);
2488	if (!nc)
2489	return NULL;
2490	return container_of(nc, struct nfs4_client, cl_nfsdfs);
2491	}
2492
2493	static void seq_quote_mem(struct seq_file *m, char *data, int len)
2494	{
2495	seq_printf(m, fmt: "\"");
2496	seq_escape_mem(m, src: data, len, ESCAPE_HEX | ESCAPE_NAP | ESCAPE_APPEND, esc: "\"\\");
2497	seq_printf(m, fmt: "\"");
2498	}
2499
2500	static const char *cb_state2str(int state)
2501	{
2502	switch (state) {
2503	case NFSD4_CB_UP:
2504	return "UP";
2505	case NFSD4_CB_UNKNOWN:
2506	return "UNKNOWN";
2507	case NFSD4_CB_DOWN:
2508	return "DOWN";
2509	case NFSD4_CB_FAULT:
2510	return "FAULT";
2511	}
2512	return "UNDEFINED";
2513	}
2514
2515	static int client_info_show(struct seq_file *m, void *v)
2516	{
2517	struct inode *inode = file_inode(f: m->file);
2518	struct nfs4_client *clp;
2519	u64 clid;
2520
2521	clp = get_nfsdfs_clp(inode);
2522	if (!clp)
2523	return -ENXIO;
2524	memcpy(&clid, &clp->cl_clientid, sizeof(clid));
2525	seq_printf(m, fmt: "clientid: 0x%llx\n", clid);
2526	seq_printf(m, fmt: "address: \"%pISpc\"\n", (struct sockaddr *)&clp->cl_addr);
2527
2528	if (clp->cl_state == NFSD4_COURTESY)
2529	seq_puts(m, s: "status: courtesy\n");
2530	else if (clp->cl_state == NFSD4_EXPIRABLE)
2531	seq_puts(m, s: "status: expirable\n");
2532	else if (test_bit(NFSD4_CLIENT_CONFIRMED, &clp->cl_flags))
2533	seq_puts(m, s: "status: confirmed\n");
2534	else
2535	seq_puts(m, s: "status: unconfirmed\n");
2536	seq_printf(m, fmt: "seconds from last renew: %lld\n",
2537	ktime_get_boottime_seconds() - clp->cl_time);
2538	seq_printf(m, fmt: "name: ");
2539	seq_quote_mem(m, data: clp->cl_name.data, len: clp->cl_name.len);
2540	seq_printf(m, fmt: "\nminor version: %d\n", clp->cl_minorversion);
2541	if (clp->cl_nii_domain.data) {
2542	seq_printf(m, fmt: "Implementation domain: ");
2543	seq_quote_mem(m, data: clp->cl_nii_domain.data,
2544	len: clp->cl_nii_domain.len);
2545	seq_printf(m, fmt: "\nImplementation name: ");
2546	seq_quote_mem(m, data: clp->cl_nii_name.data, len: clp->cl_nii_name.len);
2547	seq_printf(m, fmt: "\nImplementation time: [%lld, %ld]\n",
2548	clp->cl_nii_time.tv_sec, clp->cl_nii_time.tv_nsec);
2549	}
2550	seq_printf(m, fmt: "callback state: %s\n", cb_state2str(state: clp->cl_cb_state));
2551	seq_printf(m, fmt: "callback address: %pISpc\n", &clp->cl_cb_conn.cb_addr);
2552	drop_client(clp);
2553
2554	return 0;
2555	}
2556
2557	DEFINE_SHOW_ATTRIBUTE(client_info);
2558
2559	static void *states_start(struct seq_file *s, loff_t *pos)
2560	__acquires(&clp->cl_lock)
2561	{
2562	struct nfs4_client *clp = s->private;
2563	unsigned long id = *pos;
2564	void *ret;
2565
2566	spin_lock(lock: &clp->cl_lock);
2567	ret = idr_get_next_ul(&clp->cl_stateids, nextid: &id);
2568	*pos = id;
2569	return ret;
2570	}
2571
2572	static void *states_next(struct seq_file *s, void *v, loff_t *pos)
2573	{
2574	struct nfs4_client *clp = s->private;
2575	unsigned long id = *pos;
2576	void *ret;
2577
2578	id = *pos;
2579	id++;
2580	ret = idr_get_next_ul(&clp->cl_stateids, nextid: &id);
2581	*pos = id;
2582	return ret;
2583	}
2584
2585	static void states_stop(struct seq_file *s, void *v)
2586	__releases(&clp->cl_lock)
2587	{
2588	struct nfs4_client *clp = s->private;
2589
2590	spin_unlock(lock: &clp->cl_lock);
2591	}
2592
2593	static void nfs4_show_fname(struct seq_file *s, struct nfsd_file *f)
2594	{
2595	seq_printf(m: s, fmt: "filename: \"%pD2\"", f->nf_file);
2596	}
2597
2598	static void nfs4_show_superblock(struct seq_file *s, struct nfsd_file *f)
2599	{
2600	struct inode *inode = file_inode(f: f->nf_file);
2601
2602	seq_printf(m: s, fmt: "superblock: \"%02x:%02x:%ld\"",
2603	MAJOR(inode->i_sb->s_dev),
2604	MINOR(inode->i_sb->s_dev),
2605	inode->i_ino);
2606	}
2607
2608	static void nfs4_show_owner(struct seq_file *s, struct nfs4_stateowner *oo)
2609	{
2610	seq_printf(m: s, fmt: "owner: ");
2611	seq_quote_mem(m: s, data: oo->so_owner.data, len: oo->so_owner.len);
2612	}
2613
2614	static void nfs4_show_stateid(struct seq_file *s, stateid_t *stid)
2615	{
2616	seq_printf(m: s, fmt: "0x%.8x", stid->si_generation);
2617	seq_printf(m: s, fmt: "%12phN", &stid->si_opaque);
2618	}
2619
2620	static int nfs4_show_open(struct seq_file *s, struct nfs4_stid *st)
2621	{
2622	struct nfs4_ol_stateid *ols;
2623	struct nfs4_file *nf;
2624	struct nfsd_file *file;
2625	struct nfs4_stateowner *oo;
2626	unsigned int access, deny;
2627
2628	if (st->sc_type != NFS4_OPEN_STID && st->sc_type != NFS4_LOCK_STID)
2629	return 0; /* XXX: or SEQ_SKIP? */
2630	ols = openlockstateid(s: st);
2631	oo = ols->st_stateowner;
2632	nf = st->sc_file;
2633
2634	spin_lock(lock: &nf->fi_lock);
2635	file = find_any_file_locked(f: nf);
2636	if (!file)
2637	goto out;
2638
2639	seq_printf(m: s, fmt: "- ");
2640	nfs4_show_stateid(s, stid: &st->sc_stateid);
2641	seq_printf(m: s, fmt: ": { type: open, ");
2642
2643	access = bmap_to_share_mode(bmap: ols->st_access_bmap);
2644	deny = bmap_to_share_mode(bmap: ols->st_deny_bmap);
2645
2646	seq_printf(m: s, fmt: "access: %s%s, ",
2647	access & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2648	access & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2649	seq_printf(m: s, fmt: "deny: %s%s, ",
2650	deny & NFS4_SHARE_ACCESS_READ ? "r" : "-",
2651	deny & NFS4_SHARE_ACCESS_WRITE ? "w" : "-");
2652
2653	nfs4_show_superblock(s, f: file);
2654	seq_printf(m: s, fmt: ", ");
2655	nfs4_show_fname(s, f: file);
2656	seq_printf(m: s, fmt: ", ");
2657	nfs4_show_owner(s, oo);
2658	seq_printf(m: s, fmt: " }\n");
2659	out:
2660	spin_unlock(lock: &nf->fi_lock);
2661	return 0;
2662	}
2663
2664	static int nfs4_show_lock(struct seq_file *s, struct nfs4_stid *st)
2665	{
2666	struct nfs4_ol_stateid *ols;
2667	struct nfs4_file *nf;
2668	struct nfsd_file *file;
2669	struct nfs4_stateowner *oo;
2670
2671	ols = openlockstateid(s: st);
2672	oo = ols->st_stateowner;
2673	nf = st->sc_file;
2674	spin_lock(lock: &nf->fi_lock);
2675	file = find_any_file_locked(f: nf);
2676	if (!file)
2677	goto out;
2678
2679	seq_printf(m: s, fmt: "- ");
2680	nfs4_show_stateid(s, stid: &st->sc_stateid);
2681	seq_printf(m: s, fmt: ": { type: lock, ");
2682
2683	/*
2684	* Note: a lock stateid isn't really the same thing as a lock,
2685	* it's the locking state held by one owner on a file, and there
2686	* may be multiple (or no) lock ranges associated with it.
2687	* (Same for the matter is true of open stateids.)
2688	*/
2689
2690	nfs4_show_superblock(s, f: file);
2691	/* XXX: open stateid? */
2692	seq_printf(m: s, fmt: ", ");
2693	nfs4_show_fname(s, f: file);
2694	seq_printf(m: s, fmt: ", ");
2695	nfs4_show_owner(s, oo);
2696	seq_printf(m: s, fmt: " }\n");
2697	out:
2698	spin_unlock(lock: &nf->fi_lock);
2699	return 0;
2700	}
2701
2702	static int nfs4_show_deleg(struct seq_file *s, struct nfs4_stid *st)
2703	{
2704	struct nfs4_delegation *ds;
2705	struct nfs4_file *nf;
2706	struct nfsd_file *file;
2707
2708	ds = delegstateid(s: st);
2709	nf = st->sc_file;
2710	spin_lock(lock: &nf->fi_lock);
2711	file = nf->fi_deleg_file;
2712	if (!file)
2713	goto out;
2714
2715	seq_printf(m: s, fmt: "- ");
2716	nfs4_show_stateid(s, stid: &st->sc_stateid);
2717	seq_printf(m: s, fmt: ": { type: deleg, ");
2718
2719	/* Kinda dead code as long as we only support read delegs: */
2720	seq_printf(m: s, fmt: "access: %s, ",
2721	ds->dl_type == NFS4_OPEN_DELEGATE_READ ? "r" : "w");
2722
2723	/* XXX: lease time, whether it's being recalled. */
2724
2725	nfs4_show_superblock(s, f: file);
2726	seq_printf(m: s, fmt: ", ");
2727	nfs4_show_fname(s, f: file);
2728	seq_printf(m: s, fmt: " }\n");
2729	out:
2730	spin_unlock(lock: &nf->fi_lock);
2731	return 0;
2732	}
2733
2734	static int nfs4_show_layout(struct seq_file *s, struct nfs4_stid *st)
2735	{
2736	struct nfs4_layout_stateid *ls;
2737	struct nfsd_file *file;
2738
2739	ls = container_of(st, struct nfs4_layout_stateid, ls_stid);
2740	file = ls->ls_file;
2741
2742	seq_printf(m: s, fmt: "- ");
2743	nfs4_show_stateid(s, stid: &st->sc_stateid);
2744	seq_printf(m: s, fmt: ": { type: layout, ");
2745
2746	/* XXX: What else would be useful? */
2747
2748	nfs4_show_superblock(s, f: file);
2749	seq_printf(m: s, fmt: ", ");
2750	nfs4_show_fname(s, f: file);
2751	seq_printf(m: s, fmt: " }\n");
2752
2753	return 0;
2754	}
2755
2756	static int states_show(struct seq_file *s, void *v)
2757	{
2758	struct nfs4_stid *st = v;
2759
2760	switch (st->sc_type) {
2761	case NFS4_OPEN_STID:
2762	return nfs4_show_open(s, st);
2763	case NFS4_LOCK_STID:
2764	return nfs4_show_lock(s, st);
2765	case NFS4_DELEG_STID:
2766	return nfs4_show_deleg(s, st);
2767	case NFS4_LAYOUT_STID:
2768	return nfs4_show_layout(s, st);
2769	default:
2770	return 0; /* XXX: or SEQ_SKIP? */
2771	}
2772	/* XXX: copy stateids? */
2773	}
2774
2775	static struct seq_operations states_seq_ops = {
2776	.start = states_start,
2777	.next = states_next,
2778	.stop = states_stop,
2779	.show = states_show
2780	};
2781
2782	static int client_states_open(struct inode *inode, struct file *file)
2783	{
2784	struct seq_file *s;
2785	struct nfs4_client *clp;
2786	int ret;
2787
2788	clp = get_nfsdfs_clp(inode);
2789	if (!clp)
2790	return -ENXIO;
2791
2792	ret = seq_open(file, &states_seq_ops);
2793	if (ret)
2794	return ret;
2795	s = file->private_data;
2796	s->private = clp;
2797	return 0;
2798	}
2799
2800	static int client_opens_release(struct inode *inode, struct file *file)
2801	{
2802	struct seq_file *m = file->private_data;
2803	struct nfs4_client *clp = m->private;
2804
2805	/* XXX: alternatively, we could get/drop in seq start/stop */
2806	drop_client(clp);
2807	return 0;
2808	}
2809
2810	static const struct file_operations client_states_fops = {
2811	.open = client_states_open,
2812	.read = seq_read,
2813	.llseek = seq_lseek,
2814	.release = client_opens_release,
2815	};
2816
2817	/*
2818	* Normally we refuse to destroy clients that are in use, but here the
2819	* administrator is telling us to just do it. We also want to wait
2820	* so the caller has a guarantee that the client's locks are gone by
2821	* the time the write returns:
2822	*/
2823	static void force_expire_client(struct nfs4_client *clp)
2824	{
2825	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2826	bool already_expired;
2827
2828	trace_nfsd_clid_admin_expired(clid: &clp->cl_clientid);
2829
2830	spin_lock(lock: &nn->client_lock);
2831	clp->cl_time = 0;
2832	spin_unlock(lock: &nn->client_lock);
2833
2834	wait_event(expiry_wq, atomic_read(&clp->cl_rpc_users) == 0);
2835	spin_lock(lock: &nn->client_lock);
2836	already_expired = list_empty(head: &clp->cl_lru);
2837	if (!already_expired)
2838	unhash_client_locked(clp);
2839	spin_unlock(lock: &nn->client_lock);
2840
2841	if (!already_expired)
2842	expire_client(clp);
2843	else
2844	wait_event(expiry_wq, clp->cl_nfsd_dentry == NULL);
2845	}
2846
2847	static ssize_t client_ctl_write(struct file *file, const char __user *buf,
2848	size_t size, loff_t *pos)
2849	{
2850	char *data;
2851	struct nfs4_client *clp;
2852
2853	data = simple_transaction_get(file, buf, size);
2854	if (IS_ERR(ptr: data))
2855	return PTR_ERR(ptr: data);
2856	if (size != 7 || 0 != memcmp(p: data, q: "expire\n", size: 7))
2857	return -EINVAL;
2858	clp = get_nfsdfs_clp(inode: file_inode(f: file));
2859	if (!clp)
2860	return -ENXIO;
2861	force_expire_client(clp);
2862	drop_client(clp);
2863	return 7;
2864	}
2865
2866	static const struct file_operations client_ctl_fops = {
2867	.write = client_ctl_write,
2868	.release = simple_transaction_release,
2869	};
2870
2871	static const struct tree_descr client_files[] = {
2872	[0] = {.name: "info", .ops: &client_info_fops, S_IRUSR},
2873	[1] = {"states", &client_states_fops, S_IRUSR},
2874	[2] = {"ctl", &client_ctl_fops, S_IWUSR},
2875	[3] = {""},
2876	};
2877
2878	static int
2879	nfsd4_cb_recall_any_done(struct nfsd4_callback *cb,
2880	struct rpc_task *task)
2881	{
2882	trace_nfsd_cb_recall_any_done(cb, task);
2883	switch (task->tk_status) {
2884	case -NFS4ERR_DELAY:
2885	rpc_delay(task, 2 * HZ);
2886	return 0;
2887	default:
2888	return 1;
2889	}
2890	}
2891
2892	static void
2893	nfsd4_cb_recall_any_release(struct nfsd4_callback *cb)
2894	{
2895	struct nfs4_client *clp = cb->cb_clp;
2896	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
2897
2898	spin_lock(lock: &nn->client_lock);
2899	clear_bit(NFSD4_CLIENT_CB_RECALL_ANY, addr: &clp->cl_flags);
2900	put_client_renew_locked(clp);
2901	spin_unlock(lock: &nn->client_lock);
2902	}
2903
2904	static int
2905	nfsd4_cb_getattr_done(struct nfsd4_callback *cb, struct rpc_task *task)
2906	{
2907	struct nfs4_cb_fattr *ncf =
2908	container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
2909
2910	ncf->ncf_cb_status = task->tk_status;
2911	switch (task->tk_status) {
2912	case -NFS4ERR_DELAY:
2913	rpc_delay(task, 2 * HZ);
2914	return 0;
2915	default:
2916	return 1;
2917	}
2918	}
2919
2920	static void
2921	nfsd4_cb_getattr_release(struct nfsd4_callback *cb)
2922	{
2923	struct nfs4_cb_fattr *ncf =
2924	container_of(cb, struct nfs4_cb_fattr, ncf_getattr);
2925	struct nfs4_delegation *dp =
2926	container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
2927
2928	nfs4_put_stid(s: &dp->dl_stid);
2929	clear_bit(CB_GETATTR_BUSY, addr: &ncf->ncf_cb_flags);
2930	wake_up_bit(word: &ncf->ncf_cb_flags, CB_GETATTR_BUSY);
2931	}
2932
2933	static const struct nfsd4_callback_ops nfsd4_cb_recall_any_ops = {
2934	.done = nfsd4_cb_recall_any_done,
2935	.release = nfsd4_cb_recall_any_release,
2936	};
2937
2938	static const struct nfsd4_callback_ops nfsd4_cb_getattr_ops = {
2939	.done = nfsd4_cb_getattr_done,
2940	.release = nfsd4_cb_getattr_release,
2941	};
2942
2943	void nfs4_cb_getattr(struct nfs4_cb_fattr *ncf)
2944	{
2945	struct nfs4_delegation *dp =
2946	container_of(ncf, struct nfs4_delegation, dl_cb_fattr);
2947
2948	if (test_and_set_bit(CB_GETATTR_BUSY, addr: &ncf->ncf_cb_flags))
2949	return;
2950	refcount_inc(r: &dp->dl_stid.sc_count);
2951	nfsd4_run_cb(cb: &ncf->ncf_getattr);
2952	}
2953
2954	static struct nfs4_client *create_client(struct xdr_netobj name,
2955	struct svc_rqst *rqstp, nfs4_verifier *verf)
2956	{
2957	struct nfs4_client *clp;
2958	struct sockaddr *sa = svc_addr(rqst: rqstp);
2959	int ret;
2960	struct net *net = SVC_NET(rqstp);
2961	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
2962	struct dentry *dentries[ARRAY_SIZE(client_files)];
2963
2964	clp = alloc_client(name, nn);
2965	if (clp == NULL)
2966	return NULL;
2967
2968	ret = copy_cred(target: &clp->cl_cred, source: &rqstp->rq_cred);
2969	if (ret) {
2970	free_client(clp);
2971	return NULL;
2972	}
2973	gen_clid(clp, nn);
2974	kref_init(kref: &clp->cl_nfsdfs.cl_ref);
2975	nfsd4_init_cb(cb: &clp->cl_cb_null, clp, NULL, op: NFSPROC4_CLNT_CB_NULL);
2976	clp->cl_time = ktime_get_boottime_seconds();
2977	clear_bit(nr: 0, addr: &clp->cl_cb_slot_busy);
2978	copy_verf(target: clp, source: verf);
2979	memcpy(&clp->cl_addr, sa, sizeof(struct sockaddr_storage));
2980	clp->cl_cb_session = NULL;
2981	clp->net = net;
2982	clp->cl_nfsd_dentry = nfsd_client_mkdir(
2983	nn, ncl: &clp->cl_nfsdfs,
2984	id: clp->cl_clientid.cl_id - nn->clientid_base,
2985	client_files, fdentries: dentries);
2986	clp->cl_nfsd_info_dentry = dentries[0];
2987	if (!clp->cl_nfsd_dentry) {
2988	free_client(clp);
2989	return NULL;
2990	}
2991	clp->cl_ra = kzalloc(size: sizeof(*clp->cl_ra), GFP_KERNEL);
2992	if (!clp->cl_ra) {
2993	free_client(clp);
2994	return NULL;
2995	}
2996	clp->cl_ra_time = 0;
2997	nfsd4_init_cb(cb: &clp->cl_ra->ra_cb, clp, ops: &nfsd4_cb_recall_any_ops,
2998	op: NFSPROC4_CLNT_CB_RECALL_ANY);
2999	return clp;
3000	}
3001
3002	static void
3003	add_clp_to_name_tree(struct nfs4_client *new_clp, struct rb_root *root)
3004	{
3005	struct rb_node **new = &(root->rb_node), *parent = NULL;
3006	struct nfs4_client *clp;
3007
3008	while (*new) {
3009	clp = rb_entry(*new, struct nfs4_client, cl_namenode);
3010	parent = *new;
3011
3012	if (compare_blob(o1: &clp->cl_name, o2: &new_clp->cl_name) > 0)
3013	new = &((*new)->rb_left);
3014	else
3015	new = &((*new)->rb_right);
3016	}
3017
3018	rb_link_node(node: &new_clp->cl_namenode, parent, rb_link: new);
3019	rb_insert_color(&new_clp->cl_namenode, root);
3020	}
3021
3022	static struct nfs4_client *
3023	find_clp_in_name_tree(struct xdr_netobj *name, struct rb_root *root)
3024	{
3025	int cmp;
3026	struct rb_node *node = root->rb_node;
3027	struct nfs4_client *clp;
3028
3029	while (node) {
3030	clp = rb_entry(node, struct nfs4_client, cl_namenode);
3031	cmp = compare_blob(o1: &clp->cl_name, o2: name);
3032	if (cmp > 0)
3033	node = node->rb_left;
3034	else if (cmp < 0)
3035	node = node->rb_right;
3036	else
3037	return clp;
3038	}
3039	return NULL;
3040	}
3041
3042	static void
3043	add_to_unconfirmed(struct nfs4_client *clp)
3044	{
3045	unsigned int idhashval;
3046	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
3047
3048	lockdep_assert_held(&nn->client_lock);
3049
3050	clear_bit(NFSD4_CLIENT_CONFIRMED, addr: &clp->cl_flags);
3051	add_clp_to_name_tree(new_clp: clp, root: &nn->unconf_name_tree);
3052	idhashval = clientid_hashval(id: clp->cl_clientid.cl_id);
3053	list_add(new: &clp->cl_idhash, head: &nn->unconf_id_hashtbl[idhashval]);
3054	renew_client_locked(clp);
3055	}
3056
3057	static void
3058	move_to_confirmed(struct nfs4_client *clp)
3059	{
3060	unsigned int idhashval = clientid_hashval(id: clp->cl_clientid.cl_id);
3061	struct nfsd_net *nn = net_generic(net: clp->net, id: nfsd_net_id);
3062
3063	lockdep_assert_held(&nn->client_lock);
3064
3065	list_move(list: &clp->cl_idhash, head: &nn->conf_id_hashtbl[idhashval]);
3066	rb_erase(&clp->cl_namenode, &nn->unconf_name_tree);
3067	add_clp_to_name_tree(new_clp: clp, root: &nn->conf_name_tree);
3068	set_bit(NFSD4_CLIENT_CONFIRMED, addr: &clp->cl_flags);
3069	trace_nfsd_clid_confirmed(clid: &clp->cl_clientid);
3070	renew_client_locked(clp);
3071	}
3072
3073	static struct nfs4_client *
3074	find_client_in_id_table(struct list_head *tbl, clientid_t *clid, bool sessions)
3075	{
3076	struct nfs4_client *clp;
3077	unsigned int idhashval = clientid_hashval(id: clid->cl_id);
3078
3079	list_for_each_entry(clp, &tbl[idhashval], cl_idhash) {
3080	if (same_clid(cl1: &clp->cl_clientid, cl2: clid)) {
3081	if ((bool)clp->cl_minorversion != sessions)
3082	return NULL;
3083	renew_client_locked(clp);
3084	return clp;
3085	}
3086	}
3087	return NULL;
3088	}
3089
3090	static struct nfs4_client *
3091	find_confirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3092	{
3093	struct list_head *tbl = nn->conf_id_hashtbl;
3094
3095	lockdep_assert_held(&nn->client_lock);
3096	return find_client_in_id_table(tbl, clid, sessions);
3097	}
3098
3099	static struct nfs4_client *
3100	find_unconfirmed_client(clientid_t *clid, bool sessions, struct nfsd_net *nn)
3101	{
3102	struct list_head *tbl = nn->unconf_id_hashtbl;
3103
3104	lockdep_assert_held(&nn->client_lock);
3105	return find_client_in_id_table(tbl, clid, sessions);
3106	}
3107
3108	static bool clp_used_exchangeid(struct nfs4_client *clp)
3109	{
3110	return clp->cl_exchange_flags != 0;
3111	}
3112
3113	static struct nfs4_client *
3114	find_confirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3115	{
3116	lockdep_assert_held(&nn->client_lock);
3117	return find_clp_in_name_tree(name, root: &nn->conf_name_tree);
3118	}
3119
3120	static struct nfs4_client *
3121	find_unconfirmed_client_by_name(struct xdr_netobj *name, struct nfsd_net *nn)
3122	{
3123	lockdep_assert_held(&nn->client_lock);
3124	return find_clp_in_name_tree(name, root: &nn->unconf_name_tree);
3125	}
3126
3127	static void
3128	gen_callback(struct nfs4_client *clp, struct nfsd4_setclientid *se, struct svc_rqst *rqstp)
3129	{
3130	struct nfs4_cb_conn *conn = &clp->cl_cb_conn;
3131	struct sockaddr *sa = svc_addr(rqst: rqstp);
3132	u32 scopeid = rpc_get_scope_id(sa);
3133	unsigned short expected_family;
3134
3135	/* Currently, we only support tcp and tcp6 for the callback channel */
3136	if (se->se_callback_netid_len == 3 &&
3137	!memcmp(p: se->se_callback_netid_val, q: "tcp", size: 3))
3138	expected_family = AF_INET;
3139	else if (se->se_callback_netid_len == 4 &&
3140	!memcmp(p: se->se_callback_netid_val, q: "tcp6", size: 4))
3141	expected_family = AF_INET6;
3142	else
3143	goto out_err;
3144
3145	conn->cb_addrlen = rpc_uaddr2sockaddr(clp->net, se->se_callback_addr_val,
3146	se->se_callback_addr_len,
3147	(struct sockaddr *)&conn->cb_addr,
3148	sizeof(conn->cb_addr));
3149
3150	if (!conn->cb_addrlen || conn->cb_addr.ss_family != expected_family)
3151	goto out_err;
3152
3153	if (conn->cb_addr.ss_family == AF_INET6)
3154	((struct sockaddr_in6 *)&conn->cb_addr)->sin6_scope_id = scopeid;
3155
3156	conn->cb_prog = se->se_callback_prog;
3157	conn->cb_ident = se->se_callback_ident;
3158	memcpy(&conn->cb_saddr, &rqstp->rq_daddr, rqstp->rq_daddrlen);
3159	trace_nfsd_cb_args(clp, conn);
3160	return;
3161	out_err:
3162	conn->cb_addr.ss_family = AF_UNSPEC;
3163	conn->cb_addrlen = 0;
3164	trace_nfsd_cb_nodelegs(clp);
3165	return;
3166	}
3167
3168	/*
3169	* Cache a reply. nfsd4_check_resp_size() has bounded the cache size.
3170	*/
3171	static void
3172	nfsd4_store_cache_entry(struct nfsd4_compoundres *resp)
3173	{
3174	struct xdr_buf *buf = resp->xdr->buf;
3175	struct nfsd4_slot *slot = resp->cstate.slot;
3176	unsigned int base;
3177
3178	dprintk("--> %s slot %p\n", __func__, slot);
3179
3180	slot->sl_flags |= NFSD4_SLOT_INITIALIZED;
3181	slot->sl_opcnt = resp->opcnt;
3182	slot->sl_status = resp->cstate.status;
3183	free_svc_cred(cred: &slot->sl_cred);
3184	copy_cred(target: &slot->sl_cred, source: &resp->rqstp->rq_cred);
3185
3186	if (!nfsd4_cache_this(resp)) {
3187	slot->sl_flags &= ~NFSD4_SLOT_CACHED;
3188	return;
3189	}
3190	slot->sl_flags |= NFSD4_SLOT_CACHED;
3191
3192	base = resp->cstate.data_offset;
3193	slot->sl_datalen = buf->len - base;
3194	if (read_bytes_from_xdr_buf(buf, base, slot->sl_data, slot->sl_datalen))
3195	WARN(1, "%s: sessions DRC could not cache compound\n",
3196	__func__);
3197	return;
3198	}
3199
3200	/*
3201	* Encode the replay sequence operation from the slot values.
3202	* If cachethis is FALSE encode the uncached rep error on the next
3203	* operation which sets resp->p and increments resp->opcnt for
3204	* nfs4svc_encode_compoundres.
3205	*
3206	*/
3207	static __be32
3208	nfsd4_enc_sequence_replay(struct nfsd4_compoundargs *args,
3209	struct nfsd4_compoundres *resp)
3210	{
3211	struct nfsd4_op *op;
3212	struct nfsd4_slot *slot = resp->cstate.slot;
3213
3214	/* Encode the replayed sequence operation */
3215	op = &args->ops[resp->opcnt - 1];
3216	nfsd4_encode_operation(resp, op);
3217
3218	if (slot->sl_flags & NFSD4_SLOT_CACHED)
3219	return op->status;
3220	if (args->opcnt == 1) {
3221	/*
3222	* The original operation wasn't a solo sequence--we
3223	* always cache those--so this retry must not match the
3224	* original:
3225	*/
3226	op->status = nfserr_seq_false_retry;
3227	} else {
3228	op = &args->ops[resp->opcnt++];
3229	op->status = nfserr_retry_uncached_rep;
3230	nfsd4_encode_operation(resp, op);
3231	}
3232	return op->status;
3233	}
3234
3235	/*
3236	* The sequence operation is not cached because we can use the slot and
3237	* session values.
3238	*/
3239	static __be32
3240	nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
3241	struct nfsd4_sequence *seq)
3242	{
3243	struct nfsd4_slot *slot = resp->cstate.slot;
3244	struct xdr_stream *xdr = resp->xdr;
3245	__be32 *p;
3246	__be32 status;
3247
3248	dprintk("--> %s slot %p\n", __func__, slot);
3249
3250	status = nfsd4_enc_sequence_replay(args: resp->rqstp->rq_argp, resp);
3251	if (status)
3252	return status;
3253
3254	p = xdr_reserve_space(xdr, nbytes: slot->sl_datalen);
3255	if (!p) {
3256	WARN_ON_ONCE(1);
3257	return nfserr_serverfault;
3258	}
3259	xdr_encode_opaque_fixed(p, ptr: slot->sl_data, len: slot->sl_datalen);
3260	xdr_commit_encode(xdr);
3261
3262	resp->opcnt = slot->sl_opcnt;
3263	return slot->sl_status;
3264	}
3265
3266	/*
3267	* Set the exchange_id flags returned by the server.
3268	*/
3269	static void
3270	nfsd4_set_ex_flags(struct nfs4_client *new, struct nfsd4_exchange_id *clid)
3271	{
3272	#ifdef CONFIG_NFSD_PNFS
3273	new->cl_exchange_flags |= EXCHGID4_FLAG_USE_PNFS_MDS;
3274	#else
3275	new->cl_exchange_flags |= EXCHGID4_FLAG_USE_NON_PNFS;
3276	#endif
3277
3278	/* Referrals are supported, Migration is not. */
3279	new->cl_exchange_flags |= EXCHGID4_FLAG_SUPP_MOVED_REFER;
3280
3281	/* set the wire flags to return to client. */
3282	clid->flags = new->cl_exchange_flags;
3283	}
3284
3285	static bool client_has_openowners(struct nfs4_client *clp)
3286	{
3287	struct nfs4_openowner *oo;
3288
3289	list_for_each_entry(oo, &clp->cl_openowners, oo_perclient) {
3290	if (!list_empty(head: &oo->oo_owner.so_stateids))
3291	return true;
3292	}
3293	return false;
3294	}
3295
3296	static bool client_has_state(struct nfs4_client *clp)
3297	{
3298	return client_has_openowners(clp)
3299	#ifdef CONFIG_NFSD_PNFS
3300	|| !list_empty(head: &clp->cl_lo_states)
3301	#endif
3302	|| !list_empty(head: &clp->cl_delegations)
3303	|| !list_empty(head: &clp->cl_sessions)
3304	|| !list_empty(head: &clp->async_copies);
3305	}
3306
3307	static __be32 copy_impl_id(struct nfs4_client *clp,
3308	struct nfsd4_exchange_id *exid)
3309	{
3310	if (!exid->nii_domain.data)
3311	return 0;
3312	xdr_netobj_dup(dst: &clp->cl_nii_domain, src: &exid->nii_domain, GFP_KERNEL);
3313	if (!clp->cl_nii_domain.data)
3314	return nfserr_jukebox;
3315	xdr_netobj_dup(dst: &clp->cl_nii_name, src: &exid->nii_name, GFP_KERNEL);
3316	if (!clp->cl_nii_name.data)
3317	return nfserr_jukebox;
3318	clp->cl_nii_time = exid->nii_time;
3319	return 0;
3320	}
3321
3322	__be32
3323	nfsd4_exchange_id(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3324	union nfsd4_op_u *u)
3325	{
3326	struct nfsd4_exchange_id *exid = &u->exchange_id;
3327	struct nfs4_client *conf, *new;
3328	struct nfs4_client *unconf = NULL;
3329	__be32 status;
3330	char addr_str[INET6_ADDRSTRLEN];
3331	nfs4_verifier verf = exid->verifier;
3332	struct sockaddr *sa = svc_addr(rqst: rqstp);
3333	bool update = exid->flags & EXCHGID4_FLAG_UPD_CONFIRMED_REC_A;
3334	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
3335
3336	rpc_ntop(sa, addr_str, sizeof(addr_str));
3337	dprintk("%s rqstp=%p exid=%p clname.len=%u clname.data=%p "
3338	"ip_addr=%s flags %x, spa_how %u\n",
3339	__func__, rqstp, exid, exid->clname.len, exid->clname.data,
3340	addr_str, exid->flags, exid->spa_how);
3341
3342	if (exid->flags & ~EXCHGID4_FLAG_MASK_A)
3343	return nfserr_inval;
3344
3345	new = create_client(name: exid->clname, rqstp, verf: &verf);
3346	if (new == NULL)
3347	return nfserr_jukebox;
3348	status = copy_impl_id(clp: new, exid);
3349	if (status)
3350	goto out_nolock;
3351
3352	switch (exid->spa_how) {
3353	case SP4_MACH_CRED:
3354	exid->spo_must_enforce[0] = 0;
3355	exid->spo_must_enforce[1] = (
3356	1 << (OP_BIND_CONN_TO_SESSION - 32) |
3357	1 << (OP_EXCHANGE_ID - 32) |
3358	1 << (OP_CREATE_SESSION - 32) |
3359	1 << (OP_DESTROY_SESSION - 32) |
3360	1 << (OP_DESTROY_CLIENTID - 32));
3361
3362	exid->spo_must_allow[0] &= (1 << (OP_CLOSE) |
3363	1 << (OP_OPEN_DOWNGRADE) |
3364	1 << (OP_LOCKU) |
3365	1 << (OP_DELEGRETURN));
3366
3367	exid->spo_must_allow[1] &= (
3368	1 << (OP_TEST_STATEID - 32) |
3369	1 << (OP_FREE_STATEID - 32));
3370	if (!svc_rqst_integrity_protected(rqstp)) {
3371	status = nfserr_inval;
3372	goto out_nolock;
3373	}
3374	/*
3375	* Sometimes userspace doesn't give us a principal.
3376	* Which is a bug, really. Anyway, we can't enforce
3377	* MACH_CRED in that case, better to give up now:
3378	*/
3379	if (!new->cl_cred.cr_principal &&
3380	!new->cl_cred.cr_raw_principal) {
3381	status = nfserr_serverfault;
3382	goto out_nolock;
3383	}
3384	new->cl_mach_cred = true;
3385	break;
3386	case SP4_NONE:
3387	break;
3388	default: /* checked by xdr code */
3389	WARN_ON_ONCE(1);
3390	fallthrough;
3391	case SP4_SSV:
3392	status = nfserr_encr_alg_unsupp;
3393	goto out_nolock;
3394	}
3395
3396	/* Cases below refer to rfc 5661 section 18.35.4: */
3397	spin_lock(lock: &nn->client_lock);
3398	conf = find_confirmed_client_by_name(name: &exid->clname, nn);
3399	if (conf) {
3400	bool creds_match = same_creds(cr1: &conf->cl_cred, cr2: &rqstp->rq_cred);
3401	bool verfs_match = same_verf(v1: &verf, v2: &conf->cl_verifier);
3402
3403	if (update) {
3404	if (!clp_used_exchangeid(clp: conf)) { /* buggy client */
3405	status = nfserr_inval;
3406	goto out;
3407	}
3408	if (!nfsd4_mach_creds_match(cl: conf, rqstp)) {
3409	status = nfserr_wrong_cred;
3410	goto out;
3411	}
3412	if (!creds_match) { /* case 9 */
3413	status = nfserr_perm;
3414	goto out;
3415	}
3416	if (!verfs_match) { /* case 8 */
3417	status = nfserr_not_same;
3418	goto out;
3419	}
3420	/* case 6 */
3421	exid->flags |= EXCHGID4_FLAG_CONFIRMED_R;
3422	trace_nfsd_clid_confirmed_r(clp: conf);
3423	goto out_copy;
3424	}
3425	if (!creds_match) { /* case 3 */
3426	if (client_has_state(clp: conf)) {
3427	status = nfserr_clid_inuse;
3428	trace_nfsd_clid_cred_mismatch(clp: conf, rqstp);
3429	goto out;
3430	}
3431	goto out_new;
3432	}
3433	if (verfs_match) { /* case 2 */
3434	conf->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
3435	trace_nfsd_clid_confirmed_r(clp: conf);
3436	goto out_copy;
3437	}
3438	/* case 5, client reboot */
3439	trace_nfsd_clid_verf_mismatch(clp: conf, rqstp, verf: &verf);
3440	conf = NULL;
3441	goto out_new;
3442	}
3443
3444	if (update) { /* case 7 */
3445	status = nfserr_noent;
3446	goto out;
3447	}
3448
3449	unconf = find_unconfirmed_client_by_name(name: &exid->clname, nn);
3450	if (unconf) /* case 4, possible retry or client restart */
3451	unhash_client_locked(clp: unconf);
3452
3453	/* case 1, new owner ID */
3454	trace_nfsd_clid_fresh(clp: new);
3455
3456	out_new:
3457	if (conf) {
3458	status = mark_client_expired_locked(clp: conf);
3459	if (status)
3460	goto out;
3461	trace_nfsd_clid_replaced(clid: &conf->cl_clientid);
3462	}
3463	new->cl_minorversion = cstate->minorversion;
3464	new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
3465	new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
3466
3467	add_to_unconfirmed(clp: new);
3468	swap(new, conf);
3469	out_copy:
3470	exid->clientid.cl_boot = conf->cl_clientid.cl_boot;
3471	exid->clientid.cl_id = conf->cl_clientid.cl_id;
3472
3473	exid->seqid = conf->cl_cs_slot.sl_seqid + 1;
3474	nfsd4_set_ex_flags(new: conf, clid: exid);
3475
3476	dprintk("nfsd4_exchange_id seqid %d flags %x\n",
3477	conf->cl_cs_slot.sl_seqid, conf->cl_exchange_flags);
3478	status = nfs_ok;
3479
3480	out:
3481	spin_unlock(lock: &nn->client_lock);
3482	out_nolock:
3483	if (new)
3484	expire_client(clp: new);
3485	if (unconf) {
3486	trace_nfsd_clid_expire_unconf(clid: &unconf->cl_clientid);
3487	expire_client(clp: unconf);
3488	}
3489	return status;
3490	}
3491
3492	static __be32
3493	check_slot_seqid(u32 seqid, u32 slot_seqid, int slot_inuse)
3494	{
3495	dprintk("%s enter. seqid %d slot_seqid %d\n", __func__, seqid,
3496	slot_seqid);
3497
3498	/* The slot is in use, and no response has been sent. */
3499	if (slot_inuse) {
3500	if (seqid == slot_seqid)
3501	return nfserr_jukebox;
3502	else
3503	return nfserr_seq_misordered;
3504	}
3505	/* Note unsigned 32-bit arithmetic handles wraparound: */
3506	if (likely(seqid == slot_seqid + 1))
3507	return nfs_ok;
3508	if (seqid == slot_seqid)
3509	return nfserr_replay_cache;
3510	return nfserr_seq_misordered;
3511	}
3512
3513	/*
3514	* Cache the create session result into the create session single DRC
3515	* slot cache by saving the xdr structure. sl_seqid has been set.
3516	* Do this for solo or embedded create session operations.
3517	*/
3518	static void
3519	nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
3520	struct nfsd4_clid_slot *slot, __be32 nfserr)
3521	{
3522	slot->sl_status = nfserr;
3523	memcpy(&slot->sl_cr_ses, cr_ses, sizeof(*cr_ses));
3524	}
3525
3526	static __be32
3527	nfsd4_replay_create_session(struct nfsd4_create_session *cr_ses,
3528	struct nfsd4_clid_slot *slot)
3529	{
3530	memcpy(cr_ses, &slot->sl_cr_ses, sizeof(*cr_ses));
3531	return slot->sl_status;
3532	}
3533
3534	#define NFSD_MIN_REQ_HDR_SEQ_SZ ((\
3535	2 * 2 + /* credential,verifier: AUTH_NULL, length 0 */ \
3536	1 + /* MIN tag is length with zero, only length */ \
3537	3 + /* version, opcount, opcode */ \
3538	XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3539	/* seqid, slotID, slotID, cache */ \
3540	4 ) * sizeof(__be32))
3541
3542	#define NFSD_MIN_RESP_HDR_SEQ_SZ ((\
3543	2 + /* verifier: AUTH_NULL, length 0 */\
3544	1 + /* status */ \
3545	1 + /* MIN tag is length with zero, only length */ \
3546	3 + /* opcount, opcode, opstatus*/ \
3547	XDR_QUADLEN(NFS4_MAX_SESSIONID_LEN) + \
3548	/* seqid, slotID, slotID, slotID, status */ \
3549	5 ) * sizeof(__be32))
3550
3551	static __be32 check_forechannel_attrs(struct nfsd4_channel_attrs *ca, struct nfsd_net *nn)
3552	{
3553	u32 maxrpc = nn->nfsd_serv->sv_max_mesg;
3554
3555	if (ca->maxreq_sz < NFSD_MIN_REQ_HDR_SEQ_SZ)
3556	return nfserr_toosmall;
3557	if (ca->maxresp_sz < NFSD_MIN_RESP_HDR_SEQ_SZ)
3558	return nfserr_toosmall;
3559	ca->headerpadsz = 0;
3560	ca->maxreq_sz = min_t(u32, ca->maxreq_sz, maxrpc);
3561	ca->maxresp_sz = min_t(u32, ca->maxresp_sz, maxrpc);
3562	ca->maxops = min_t(u32, ca->maxops, NFSD_MAX_OPS_PER_COMPOUND);
3563	ca->maxresp_cached = min_t(u32, ca->maxresp_cached,
3564	NFSD_SLOT_CACHE_SIZE + NFSD_MIN_HDR_SEQ_SZ);
3565	ca->maxreqs = min_t(u32, ca->maxreqs, NFSD_MAX_SLOTS_PER_SESSION);
3566	/*
3567	* Note decreasing slot size below client's request may make it
3568	* difficult for client to function correctly, whereas
3569	* decreasing the number of slots will (just?) affect
3570	* performance. When short on memory we therefore prefer to
3571	* decrease number of slots instead of their size. Clients that
3572	* request larger slots than they need will get poor results:
3573	* Note that we always allow at least one slot, because our
3574	* accounting is soft and provides no guarantees either way.
3575	*/
3576	ca->maxreqs = nfsd4_get_drc_mem(ca, nn);
3577
3578	return nfs_ok;
3579	}
3580
3581	/*
3582	* Server's NFSv4.1 backchannel support is AUTH_SYS-only for now.
3583	* These are based on similar macros in linux/sunrpc/msg_prot.h .
3584	*/
3585	#define RPC_MAX_HEADER_WITH_AUTH_SYS \
3586	(RPC_CALLHDRSIZE + 2 * (2 + UNX_CALLSLACK))
3587
3588	#define RPC_MAX_REPHEADER_WITH_AUTH_SYS \
3589	(RPC_REPHDRSIZE + (2 + NUL_REPLYSLACK))
3590
3591	#define NFSD_CB_MAX_REQ_SZ ((NFS4_enc_cb_recall_sz + \
3592	RPC_MAX_HEADER_WITH_AUTH_SYS) * sizeof(__be32))
3593	#define NFSD_CB_MAX_RESP_SZ ((NFS4_dec_cb_recall_sz + \
3594	RPC_MAX_REPHEADER_WITH_AUTH_SYS) * \
3595	sizeof(__be32))
3596
3597	static __be32 check_backchannel_attrs(struct nfsd4_channel_attrs *ca)
3598	{
3599	ca->headerpadsz = 0;
3600
3601	if (ca->maxreq_sz < NFSD_CB_MAX_REQ_SZ)
3602	return nfserr_toosmall;
3603	if (ca->maxresp_sz < NFSD_CB_MAX_RESP_SZ)
3604	return nfserr_toosmall;
3605	ca->maxresp_cached = 0;
3606	if (ca->maxops < 2)
3607	return nfserr_toosmall;
3608
3609	return nfs_ok;
3610	}
3611
3612	static __be32 nfsd4_check_cb_sec(struct nfsd4_cb_sec *cbs)
3613	{
3614	switch (cbs->flavor) {
3615	case RPC_AUTH_NULL:
3616	case RPC_AUTH_UNIX:
3617	return nfs_ok;
3618	default:
3619	/*
3620	* GSS case: the spec doesn't allow us to return this
3621	* error. But it also doesn't allow us not to support
3622	* GSS.
3623	* I'd rather this fail hard than return some error the
3624	* client might think it can already handle:
3625	*/
3626	return nfserr_encr_alg_unsupp;
3627	}
3628	}
3629
3630	__be32
3631	nfsd4_create_session(struct svc_rqst *rqstp,
3632	struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
3633	{
3634	struct nfsd4_create_session *cr_ses = &u->create_session;
3635	struct sockaddr *sa = svc_addr(rqst: rqstp);
3636	struct nfs4_client *conf, *unconf;
3637	struct nfs4_client *old = NULL;
3638	struct nfsd4_session *new;
3639	struct nfsd4_conn *conn;
3640	struct nfsd4_clid_slot *cs_slot = NULL;
3641	__be32 status = 0;
3642	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
3643
3644	if (cr_ses->flags & ~SESSION4_FLAG_MASK_A)
3645	return nfserr_inval;
3646	status = nfsd4_check_cb_sec(cbs: &cr_ses->cb_sec);
3647	if (status)
3648	return status;
3649	status = check_forechannel_attrs(ca: &cr_ses->fore_channel, nn);
3650	if (status)
3651	return status;
3652	status = check_backchannel_attrs(ca: &cr_ses->back_channel);
3653	if (status)
3654	goto out_release_drc_mem;
3655	status = nfserr_jukebox;
3656	new = alloc_session(fattrs: &cr_ses->fore_channel, battrs: &cr_ses->back_channel);
3657	if (!new)
3658	goto out_release_drc_mem;
3659	conn = alloc_conn_from_crses(rqstp, cses: cr_ses);
3660	if (!conn)
3661	goto out_free_session;
3662
3663	spin_lock(lock: &nn->client_lock);
3664	unconf = find_unconfirmed_client(clid: &cr_ses->clientid, sessions: true, nn);
3665	conf = find_confirmed_client(clid: &cr_ses->clientid, sessions: true, nn);
3666	WARN_ON_ONCE(conf && unconf);
3667
3668	if (conf) {
3669	status = nfserr_wrong_cred;
3670	if (!nfsd4_mach_creds_match(cl: conf, rqstp))
3671	goto out_free_conn;
3672	cs_slot = &conf->cl_cs_slot;
3673	status = check_slot_seqid(seqid: cr_ses->seqid, slot_seqid: cs_slot->sl_seqid, slot_inuse: 0);
3674	if (status) {
3675	if (status == nfserr_replay_cache)
3676	status = nfsd4_replay_create_session(cr_ses, slot: cs_slot);
3677	goto out_free_conn;
3678	}
3679	} else if (unconf) {
3680	status = nfserr_clid_inuse;
3681	if (!same_creds(cr1: &unconf->cl_cred, cr2: &rqstp->rq_cred) ||
3682	!rpc_cmp_addr(sap1: sa, sap2: (struct sockaddr *) &unconf->cl_addr)) {
3683	trace_nfsd_clid_cred_mismatch(clp: unconf, rqstp);
3684	goto out_free_conn;
3685	}
3686	status = nfserr_wrong_cred;
3687	if (!nfsd4_mach_creds_match(cl: unconf, rqstp))
3688	goto out_free_conn;
3689	cs_slot = &unconf->cl_cs_slot;
3690	status = check_slot_seqid(seqid: cr_ses->seqid, slot_seqid: cs_slot->sl_seqid, slot_inuse: 0);
3691	if (status) {
3692	/* an unconfirmed replay returns misordered */
3693	status = nfserr_seq_misordered;
3694	goto out_free_conn;
3695	}
3696	old = find_confirmed_client_by_name(name: &unconf->cl_name, nn);
3697	if (old) {
3698	status = mark_client_expired_locked(clp: old);
3699	if (status) {
3700	old = NULL;
3701	goto out_free_conn;
3702	}
3703	trace_nfsd_clid_replaced(clid: &old->cl_clientid);
3704	}
3705	move_to_confirmed(clp: unconf);
3706	conf = unconf;
3707	} else {
3708	status = nfserr_stale_clientid;
3709	goto out_free_conn;
3710	}
3711	status = nfs_ok;
3712	/* Persistent sessions are not supported */
3713	cr_ses->flags &= ~SESSION4_PERSIST;
3714	/* Upshifting from TCP to RDMA is not supported */
3715	cr_ses->flags &= ~SESSION4_RDMA;
3716
3717	init_session(rqstp, new, clp: conf, cses: cr_ses);
3718	nfsd4_get_session_locked(ses: new);
3719
3720	memcpy(cr_ses->sessionid.data, new->se_sessionid.data,
3721	NFS4_MAX_SESSIONID_LEN);
3722	cs_slot->sl_seqid++;
3723	cr_ses->seqid = cs_slot->sl_seqid;
3724
3725	/* cache solo and embedded create sessions under the client_lock */
3726	nfsd4_cache_create_session(cr_ses, slot: cs_slot, nfserr: status);
3727	spin_unlock(lock: &nn->client_lock);
3728	if (conf == unconf)
3729	fsnotify_dentry(dentry: conf->cl_nfsd_info_dentry, FS_MODIFY);
3730	/* init connection and backchannel */
3731	nfsd4_init_conn(rqstp, conn, ses: new);
3732	nfsd4_put_session(ses: new);
3733	if (old)
3734	expire_client(clp: old);
3735	return status;
3736	out_free_conn:
3737	spin_unlock(lock: &nn->client_lock);
3738	free_conn(c: conn);
3739	if (old)
3740	expire_client(clp: old);
3741	out_free_session:
3742	__free_session(ses: new);
3743	out_release_drc_mem:
3744	nfsd4_put_drc_mem(ca: &cr_ses->fore_channel);
3745	return status;
3746	}
3747
3748	static __be32 nfsd4_map_bcts_dir(u32 *dir)
3749	{
3750	switch (*dir) {
3751	case NFS4_CDFC4_FORE:
3752	case NFS4_CDFC4_BACK:
3753	return nfs_ok;
3754	case NFS4_CDFC4_FORE_OR_BOTH:
3755	case NFS4_CDFC4_BACK_OR_BOTH:
3756	*dir = NFS4_CDFC4_BOTH;
3757	return nfs_ok;
3758	}
3759	return nfserr_inval;
3760	}
3761
3762	__be32 nfsd4_backchannel_ctl(struct svc_rqst *rqstp,
3763	struct nfsd4_compound_state *cstate,
3764	union nfsd4_op_u *u)
3765	{
3766	struct nfsd4_backchannel_ctl *bc = &u->backchannel_ctl;
3767	struct nfsd4_session *session = cstate->session;
3768	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
3769	__be32 status;
3770
3771	status = nfsd4_check_cb_sec(cbs: &bc->bc_cb_sec);
3772	if (status)
3773	return status;
3774	spin_lock(lock: &nn->client_lock);
3775	session->se_cb_prog = bc->bc_cb_program;
3776	session->se_cb_sec = bc->bc_cb_sec;
3777	spin_unlock(lock: &nn->client_lock);
3778
3779	nfsd4_probe_callback(clp: session->se_client);
3780
3781	return nfs_ok;
3782	}
3783
3784	static struct nfsd4_conn *__nfsd4_find_conn(struct svc_xprt *xpt, struct nfsd4_session *s)
3785	{
3786	struct nfsd4_conn *c;
3787
3788	list_for_each_entry(c, &s->se_conns, cn_persession) {
3789	if (c->cn_xprt == xpt) {
3790	return c;
3791	}
3792	}
3793	return NULL;
3794	}
3795
3796	static __be32 nfsd4_match_existing_connection(struct svc_rqst *rqst,
3797	struct nfsd4_session *session, u32 req, struct nfsd4_conn **conn)
3798	{
3799	struct nfs4_client *clp = session->se_client;
3800	struct svc_xprt *xpt = rqst->rq_xprt;
3801	struct nfsd4_conn *c;
3802	__be32 status;
3803
3804	/* Following the last paragraph of RFC 5661 Section 18.34.3: */
3805	spin_lock(lock: &clp->cl_lock);
3806	c = __nfsd4_find_conn(xpt, s: session);
3807	if (!c)
3808	status = nfserr_noent;
3809	else if (req == c->cn_flags)
3810	status = nfs_ok;
3811	else if (req == NFS4_CDFC4_FORE_OR_BOTH &&
3812	c->cn_flags != NFS4_CDFC4_BACK)
3813	status = nfs_ok;
3814	else if (req == NFS4_CDFC4_BACK_OR_BOTH &&
3815	c->cn_flags != NFS4_CDFC4_FORE)
3816	status = nfs_ok;
3817	else
3818	status = nfserr_inval;
3819	spin_unlock(lock: &clp->cl_lock);
3820	if (status == nfs_ok && conn)
3821	*conn = c;
3822	return status;
3823	}
3824
3825	__be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
3826	struct nfsd4_compound_state *cstate,
3827	union nfsd4_op_u *u)
3828	{
3829	struct nfsd4_bind_conn_to_session *bcts = &u->bind_conn_to_session;
3830	__be32 status;
3831	struct nfsd4_conn *conn;
3832	struct nfsd4_session *session;
3833	struct net *net = SVC_NET(rqstp);
3834	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
3835
3836	if (!nfsd4_last_compound_op(rqstp))
3837	return nfserr_not_only_op;
3838	spin_lock(lock: &nn->client_lock);
3839	session = find_in_sessionid_hashtbl(sessionid: &bcts->sessionid, net, ret: &status);
3840	spin_unlock(lock: &nn->client_lock);
3841	if (!session)
3842	goto out_no_session;
3843	status = nfserr_wrong_cred;
3844	if (!nfsd4_mach_creds_match(cl: session->se_client, rqstp))
3845	goto out;
3846	status = nfsd4_match_existing_connection(rqst: rqstp, session,
3847	req: bcts->dir, conn: &conn);
3848	if (status == nfs_ok) {
3849	if (bcts->dir == NFS4_CDFC4_FORE_OR_BOTH ||
3850	bcts->dir == NFS4_CDFC4_BACK)
3851	conn->cn_flags |= NFS4_CDFC4_BACK;
3852	nfsd4_probe_callback(clp: session->se_client);
3853	goto out;
3854	}
3855	if (status == nfserr_inval)
3856	goto out;
3857	status = nfsd4_map_bcts_dir(dir: &bcts->dir);
3858	if (status)
3859	goto out;
3860	conn = alloc_conn(rqstp, flags: bcts->dir);
3861	status = nfserr_jukebox;
3862	if (!conn)
3863	goto out;
3864	nfsd4_init_conn(rqstp, conn, ses: session);
3865	status = nfs_ok;
3866	out:
3867	nfsd4_put_session(ses: session);
3868	out_no_session:
3869	return status;
3870	}
3871
3872	static bool nfsd4_compound_in_session(struct nfsd4_compound_state *cstate, struct nfs4_sessionid *sid)
3873	{
3874	if (!cstate->session)
3875	return false;
3876	return !memcmp(p: sid, q: &cstate->session->se_sessionid, size: sizeof(*sid));
3877	}
3878
3879	__be32
3880	nfsd4_destroy_session(struct svc_rqst *r, struct nfsd4_compound_state *cstate,
3881	union nfsd4_op_u *u)
3882	{
3883	struct nfs4_sessionid *sessionid = &u->destroy_session.sessionid;
3884	struct nfsd4_session *ses;
3885	__be32 status;
3886	int ref_held_by_me = 0;
3887	struct net *net = SVC_NET(r);
3888	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
3889
3890	status = nfserr_not_only_op;
3891	if (nfsd4_compound_in_session(cstate, sid: sessionid)) {
3892	if (!nfsd4_last_compound_op(rqstp: r))
3893	goto out;
3894	ref_held_by_me++;
3895	}
3896	dump_sessionid(fn: __func__, sessionid);
3897	spin_lock(lock: &nn->client_lock);
3898	ses = find_in_sessionid_hashtbl(sessionid, net, ret: &status);
3899	if (!ses)
3900	goto out_client_lock;
3901	status = nfserr_wrong_cred;
3902	if (!nfsd4_mach_creds_match(cl: ses->se_client, rqstp: r))
3903	goto out_put_session;
3904	status = mark_session_dead_locked(ses, ref_held_by_me: 1 + ref_held_by_me);
3905	if (status)
3906	goto out_put_session;
3907	unhash_session(ses);
3908	spin_unlock(lock: &nn->client_lock);
3909
3910	nfsd4_probe_callback_sync(clp: ses->se_client);
3911
3912	spin_lock(lock: &nn->client_lock);
3913	status = nfs_ok;
3914	out_put_session:
3915	nfsd4_put_session_locked(ses);
3916	out_client_lock:
3917	spin_unlock(lock: &nn->client_lock);
3918	out:
3919	return status;
3920	}
3921
3922	static __be32 nfsd4_sequence_check_conn(struct nfsd4_conn *new, struct nfsd4_session *ses)
3923	{
3924	struct nfs4_client *clp = ses->se_client;
3925	struct nfsd4_conn *c;
3926	__be32 status = nfs_ok;
3927	int ret;
3928
3929	spin_lock(lock: &clp->cl_lock);
3930	c = __nfsd4_find_conn(xpt: new->cn_xprt, s: ses);
3931	if (c)
3932	goto out_free;
3933	status = nfserr_conn_not_bound_to_session;
3934	if (clp->cl_mach_cred)
3935	goto out_free;
3936	__nfsd4_hash_conn(conn: new, ses);
3937	spin_unlock(lock: &clp->cl_lock);
3938	ret = nfsd4_register_conn(conn: new);
3939	if (ret)
3940	/* oops; xprt is already down: */
3941	nfsd4_conn_lost(u: &new->cn_xpt_user);
3942	return nfs_ok;
3943	out_free:
3944	spin_unlock(lock: &clp->cl_lock);
3945	free_conn(c: new);
3946	return status;
3947	}
3948
3949	static bool nfsd4_session_too_many_ops(struct svc_rqst *rqstp, struct nfsd4_session *session)
3950	{
3951	struct nfsd4_compoundargs *args = rqstp->rq_argp;
3952
3953	return args->opcnt > session->se_fchannel.maxops;
3954	}
3955
3956	static bool nfsd4_request_too_big(struct svc_rqst *rqstp,
3957	struct nfsd4_session *session)
3958	{
3959	struct xdr_buf *xb = &rqstp->rq_arg;
3960
3961	return xb->len > session->se_fchannel.maxreq_sz;
3962	}
3963
3964	static bool replay_matches_cache(struct svc_rqst *rqstp,
3965	struct nfsd4_sequence *seq, struct nfsd4_slot *slot)
3966	{
3967	struct nfsd4_compoundargs *argp = rqstp->rq_argp;
3968
3969	if ((bool)(slot->sl_flags & NFSD4_SLOT_CACHETHIS) !=
3970	(bool)seq->cachethis)
3971	return false;
3972	/*
3973	* If there's an error then the reply can have fewer ops than
3974	* the call.
3975	*/
3976	if (slot->sl_opcnt < argp->opcnt && !slot->sl_status)
3977	return false;
3978	/*
3979	* But if we cached a reply with *more* ops than the call you're
3980	* sending us now, then this new call is clearly not really a
3981	* replay of the old one:
3982	*/
3983	if (slot->sl_opcnt > argp->opcnt)
3984	return false;
3985	/* This is the only check explicitly called by spec: */
3986	if (!same_creds(cr1: &rqstp->rq_cred, cr2: &slot->sl_cred))
3987	return false;
3988	/*
3989	* There may be more comparisons we could actually do, but the
3990	* spec doesn't require us to catch every case where the calls
3991	* don't match (that would require caching the call as well as
3992	* the reply), so we don't bother.
3993	*/
3994	return true;
3995	}
3996
3997	__be32
3998	nfsd4_sequence(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
3999	union nfsd4_op_u *u)
4000	{
4001	struct nfsd4_sequence *seq = &u->sequence;
4002	struct nfsd4_compoundres *resp = rqstp->rq_resp;
4003	struct xdr_stream *xdr = resp->xdr;
4004	struct nfsd4_session *session;
4005	struct nfs4_client *clp;
4006	struct nfsd4_slot *slot;
4007	struct nfsd4_conn *conn;
4008	__be32 status;
4009	int buflen;
4010	struct net *net = SVC_NET(rqstp);
4011	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
4012
4013	if (resp->opcnt != 1)
4014	return nfserr_sequence_pos;
4015
4016	/*
4017	* Will be either used or freed by nfsd4_sequence_check_conn
4018	* below.
4019	*/
4020	conn = alloc_conn(rqstp, NFS4_CDFC4_FORE);
4021	if (!conn)
4022	return nfserr_jukebox;
4023
4024	spin_lock(lock: &nn->client_lock);
4025	session = find_in_sessionid_hashtbl(sessionid: &seq->sessionid, net, ret: &status);
4026	if (!session)
4027	goto out_no_session;
4028	clp = session->se_client;
4029
4030	status = nfserr_too_many_ops;
4031	if (nfsd4_session_too_many_ops(rqstp, session))
4032	goto out_put_session;
4033
4034	status = nfserr_req_too_big;
4035	if (nfsd4_request_too_big(rqstp, session))
4036	goto out_put_session;
4037
4038	status = nfserr_badslot;
4039	if (seq->slotid >= session->se_fchannel.maxreqs)
4040	goto out_put_session;
4041
4042	slot = session->se_slots[seq->slotid];
4043	dprintk("%s: slotid %d\n", __func__, seq->slotid);
4044
4045	/* We do not negotiate the number of slots yet, so set the
4046	* maxslots to the session maxreqs which is used to encode
4047	* sr_highest_slotid and the sr_target_slot id to maxslots */
4048	seq->maxslots = session->se_fchannel.maxreqs;
4049
4050	status = check_slot_seqid(seqid: seq->seqid, slot_seqid: slot->sl_seqid,
4051	slot_inuse: slot->sl_flags & NFSD4_SLOT_INUSE);
4052	if (status == nfserr_replay_cache) {
4053	status = nfserr_seq_misordered;
4054	if (!(slot->sl_flags & NFSD4_SLOT_INITIALIZED))
4055	goto out_put_session;
4056	status = nfserr_seq_false_retry;
4057	if (!replay_matches_cache(rqstp, seq, slot))
4058	goto out_put_session;
4059	cstate->slot = slot;
4060	cstate->session = session;
4061	cstate->clp = clp;
4062	/* Return the cached reply status and set cstate->status
4063	* for nfsd4_proc_compound processing */
4064	status = nfsd4_replay_cache_entry(resp, seq);
4065	cstate->status = nfserr_replay_cache;
4066	goto out;
4067	}
4068	if (status)
4069	goto out_put_session;
4070
4071	status = nfsd4_sequence_check_conn(new: conn, ses: session);
4072	conn = NULL;
4073	if (status)
4074	goto out_put_session;
4075
4076	buflen = (seq->cachethis) ?
4077	session->se_fchannel.maxresp_cached :
4078	session->se_fchannel.maxresp_sz;
4079	status = (seq->cachethis) ? nfserr_rep_too_big_to_cache :
4080	nfserr_rep_too_big;
4081	if (xdr_restrict_buflen(xdr, newbuflen: buflen - rqstp->rq_auth_slack))
4082	goto out_put_session;
4083	svc_reserve(rqstp, space: buflen);
4084
4085	status = nfs_ok;
4086	/* Success! bump slot seqid */
4087	slot->sl_seqid = seq->seqid;
4088	slot->sl_flags |= NFSD4_SLOT_INUSE;
4089	if (seq->cachethis)
4090	slot->sl_flags |= NFSD4_SLOT_CACHETHIS;
4091	else
4092	slot->sl_flags &= ~NFSD4_SLOT_CACHETHIS;
4093
4094	cstate->slot = slot;
4095	cstate->session = session;
4096	cstate->clp = clp;
4097
4098	out:
4099	switch (clp->cl_cb_state) {
4100	case NFSD4_CB_DOWN:
4101	seq->status_flags = SEQ4_STATUS_CB_PATH_DOWN;
4102	break;
4103	case NFSD4_CB_FAULT:
4104	seq->status_flags = SEQ4_STATUS_BACKCHANNEL_FAULT;
4105	break;
4106	default:
4107	seq->status_flags = 0;
4108	}
4109	if (!list_empty(head: &clp->cl_revoked))
4110	seq->status_flags |= SEQ4_STATUS_RECALLABLE_STATE_REVOKED;
4111	out_no_session:
4112	if (conn)
4113	free_conn(c: conn);
4114	spin_unlock(lock: &nn->client_lock);
4115	return status;
4116	out_put_session:
4117	nfsd4_put_session_locked(ses: session);
4118	goto out_no_session;
4119	}
4120
4121	void
4122	nfsd4_sequence_done(struct nfsd4_compoundres *resp)
4123	{
4124	struct nfsd4_compound_state *cs = &resp->cstate;
4125
4126	if (nfsd4_has_session(cs)) {
4127	if (cs->status != nfserr_replay_cache) {
4128	nfsd4_store_cache_entry(resp);
4129	cs->slot->sl_flags &= ~NFSD4_SLOT_INUSE;
4130	}
4131	/* Drop session reference that was taken in nfsd4_sequence() */
4132	nfsd4_put_session(ses: cs->session);
4133	} else if (cs->clp)
4134	put_client_renew(clp: cs->clp);
4135	}
4136
4137	__be32
4138	nfsd4_destroy_clientid(struct svc_rqst *rqstp,
4139	struct nfsd4_compound_state *cstate,
4140	union nfsd4_op_u *u)
4141	{
4142	struct nfsd4_destroy_clientid *dc = &u->destroy_clientid;
4143	struct nfs4_client *conf, *unconf;
4144	struct nfs4_client *clp = NULL;
4145	__be32 status = 0;
4146	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
4147
4148	spin_lock(lock: &nn->client_lock);
4149	unconf = find_unconfirmed_client(clid: &dc->clientid, sessions: true, nn);
4150	conf = find_confirmed_client(clid: &dc->clientid, sessions: true, nn);
4151	WARN_ON_ONCE(conf && unconf);
4152
4153	if (conf) {
4154	if (client_has_state(clp: conf)) {
4155	status = nfserr_clientid_busy;
4156	goto out;
4157	}
4158	status = mark_client_expired_locked(clp: conf);
4159	if (status)
4160	goto out;
4161	clp = conf;
4162	} else if (unconf)
4163	clp = unconf;
4164	else {
4165	status = nfserr_stale_clientid;
4166	goto out;
4167	}
4168	if (!nfsd4_mach_creds_match(cl: clp, rqstp)) {
4169	clp = NULL;
4170	status = nfserr_wrong_cred;
4171	goto out;
4172	}
4173	trace_nfsd_clid_destroyed(clid: &clp->cl_clientid);
4174	unhash_client_locked(clp);
4175	out:
4176	spin_unlock(lock: &nn->client_lock);
4177	if (clp)
4178	expire_client(clp);
4179	return status;
4180	}
4181
4182	__be32
4183	nfsd4_reclaim_complete(struct svc_rqst *rqstp,
4184	struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
4185	{
4186	struct nfsd4_reclaim_complete *rc = &u->reclaim_complete;
4187	struct nfs4_client *clp = cstate->clp;
4188	__be32 status = 0;
4189
4190	if (rc->rca_one_fs) {
4191	if (!cstate->current_fh.fh_dentry)
4192	return nfserr_nofilehandle;
4193	/*
4194	* We don't take advantage of the rca_one_fs case.
4195	* That's OK, it's optional, we can safely ignore it.
4196	*/
4197	return nfs_ok;
4198	}
4199
4200	status = nfserr_complete_already;
4201	if (test_and_set_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, addr: &clp->cl_flags))
4202	goto out;
4203
4204	status = nfserr_stale_clientid;
4205	if (is_client_expired(clp))
4206	/*
4207	* The following error isn't really legal.
4208	* But we only get here if the client just explicitly
4209	* destroyed the client. Surely it no longer cares what
4210	* error it gets back on an operation for the dead
4211	* client.
4212	*/
4213	goto out;
4214
4215	status = nfs_ok;
4216	trace_nfsd_clid_reclaim_complete(clid: &clp->cl_clientid);
4217	nfsd4_client_record_create(clp);
4218	inc_reclaim_complete(clp);
4219	out:
4220	return status;
4221	}
4222
4223	__be32
4224	nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
4225	union nfsd4_op_u *u)
4226	{
4227	struct nfsd4_setclientid *setclid = &u->setclientid;
4228	struct xdr_netobj clname = setclid->se_name;
4229	nfs4_verifier clverifier = setclid->se_verf;
4230	struct nfs4_client *conf, *new;
4231	struct nfs4_client *unconf = NULL;
4232	__be32 status;
4233	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
4234
4235	new = create_client(name: clname, rqstp, verf: &clverifier);
4236	if (new == NULL)
4237	return nfserr_jukebox;
4238	spin_lock(lock: &nn->client_lock);
4239	conf = find_confirmed_client_by_name(name: &clname, nn);
4240	if (conf && client_has_state(clp: conf)) {
4241	status = nfserr_clid_inuse;
4242	if (clp_used_exchangeid(clp: conf))
4243	goto out;
4244	if (!same_creds(cr1: &conf->cl_cred, cr2: &rqstp->rq_cred)) {
4245	trace_nfsd_clid_cred_mismatch(clp: conf, rqstp);
4246	goto out;
4247	}
4248	}
4249	unconf = find_unconfirmed_client_by_name(name: &clname, nn);
4250	if (unconf)
4251	unhash_client_locked(clp: unconf);
4252	if (conf) {
4253	if (same_verf(v1: &conf->cl_verifier, v2: &clverifier)) {
4254	copy_clid(target: new, source: conf);
4255	gen_confirm(clp: new, nn);
4256	} else
4257	trace_nfsd_clid_verf_mismatch(clp: conf, rqstp,
4258	verf: &clverifier);
4259	} else
4260	trace_nfsd_clid_fresh(clp: new);
4261	new->cl_minorversion = 0;
4262	gen_callback(clp: new, se: setclid, rqstp);
4263	add_to_unconfirmed(clp: new);
4264	setclid->se_clientid.cl_boot = new->cl_clientid.cl_boot;
4265	setclid->se_clientid.cl_id = new->cl_clientid.cl_id;
4266	memcpy(setclid->se_confirm.data, new->cl_confirm.data, sizeof(setclid->se_confirm.data));
4267	new = NULL;
4268	status = nfs_ok;
4269	out:
4270	spin_unlock(lock: &nn->client_lock);
4271	if (new)
4272	free_client(clp: new);
4273	if (unconf) {
4274	trace_nfsd_clid_expire_unconf(clid: &unconf->cl_clientid);
4275	expire_client(clp: unconf);
4276	}
4277	return status;
4278	}
4279
4280	__be32
4281	nfsd4_setclientid_confirm(struct svc_rqst *rqstp,
4282	struct nfsd4_compound_state *cstate,
4283	union nfsd4_op_u *u)
4284	{
4285	struct nfsd4_setclientid_confirm *setclientid_confirm =
4286	&u->setclientid_confirm;
4287	struct nfs4_client *conf, *unconf;
4288	struct nfs4_client *old = NULL;
4289	nfs4_verifier confirm = setclientid_confirm->sc_confirm;
4290	clientid_t * clid = &setclientid_confirm->sc_clientid;
4291	__be32 status;
4292	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
4293
4294	if (STALE_CLIENTID(clid, nn))
4295	return nfserr_stale_clientid;
4296
4297	spin_lock(lock: &nn->client_lock);
4298	conf = find_confirmed_client(clid, sessions: false, nn);
4299	unconf = find_unconfirmed_client(clid, sessions: false, nn);
4300	/*
4301	* We try hard to give out unique clientid's, so if we get an
4302	* attempt to confirm the same clientid with a different cred,
4303	* the client may be buggy; this should never happen.
4304	*
4305	* Nevertheless, RFC 7530 recommends INUSE for this case:
4306	*/
4307	status = nfserr_clid_inuse;
4308	if (unconf && !same_creds(cr1: &unconf->cl_cred, cr2: &rqstp->rq_cred)) {
4309	trace_nfsd_clid_cred_mismatch(clp: unconf, rqstp);
4310	goto out;
4311	}
4312	if (conf && !same_creds(cr1: &conf->cl_cred, cr2: &rqstp->rq_cred)) {
4313	trace_nfsd_clid_cred_mismatch(clp: conf, rqstp);
4314	goto out;
4315	}
4316	if (!unconf || !same_verf(v1: &confirm, v2: &unconf->cl_confirm)) {
4317	if (conf && same_verf(v1: &confirm, v2: &conf->cl_confirm)) {
4318	status = nfs_ok;
4319	} else
4320	status = nfserr_stale_clientid;
4321	goto out;
4322	}
4323	status = nfs_ok;
4324	if (conf) {
4325	old = unconf;
4326	unhash_client_locked(clp: old);
4327	nfsd4_change_callback(clp: conf, &unconf->cl_cb_conn);
4328	} else {
4329	old = find_confirmed_client_by_name(name: &unconf->cl_name, nn);
4330	if (old) {
4331	status = nfserr_clid_inuse;
4332	if (client_has_state(clp: old)
4333	&& !same_creds(cr1: &unconf->cl_cred,
4334	cr2: &old->cl_cred)) {
4335	old = NULL;
4336	goto out;
4337	}
4338	status = mark_client_expired_locked(clp: old);
4339	if (status) {
4340	old = NULL;
4341	goto out;
4342	}
4343	trace_nfsd_clid_replaced(clid: &old->cl_clientid);
4344	}
4345	move_to_confirmed(clp: unconf);
4346	conf = unconf;
4347	}
4348	get_client_locked(clp: conf);
4349	spin_unlock(lock: &nn->client_lock);
4350	if (conf == unconf)
4351	fsnotify_dentry(dentry: conf->cl_nfsd_info_dentry, FS_MODIFY);
4352	nfsd4_probe_callback(clp: conf);
4353	spin_lock(lock: &nn->client_lock);
4354	put_client_renew_locked(clp: conf);
4355	out:
4356	spin_unlock(lock: &nn->client_lock);
4357	if (old)
4358	expire_client(clp: old);
4359	return status;
4360	}
4361
4362	static struct nfs4_file *nfsd4_alloc_file(void)
4363	{
4364	return kmem_cache_alloc(cachep: file_slab, GFP_KERNEL);
4365	}
4366
4367	/* OPEN Share state helper functions */
4368
4369	static void nfsd4_file_init(const struct svc_fh *fh, struct nfs4_file *fp)
4370	{
4371	refcount_set(r: &fp->fi_ref, n: 1);
4372	spin_lock_init(&fp->fi_lock);
4373	INIT_LIST_HEAD(list: &fp->fi_stateids);
4374	INIT_LIST_HEAD(list: &fp->fi_delegations);
4375	INIT_LIST_HEAD(list: &fp->fi_clnt_odstate);
4376	fh_copy_shallow(dst: &fp->fi_fhandle, src: &fh->fh_handle);
4377	fp->fi_deleg_file = NULL;
4378	fp->fi_had_conflict = false;
4379	fp->fi_share_deny = 0;
4380	memset(fp->fi_fds, 0, sizeof(fp->fi_fds));
4381	memset(fp->fi_access, 0, sizeof(fp->fi_access));
4382	fp->fi_aliased = false;
4383	fp->fi_inode = d_inode(dentry: fh->fh_dentry);
4384	#ifdef CONFIG_NFSD_PNFS
4385	INIT_LIST_HEAD(list: &fp->fi_lo_states);
4386	atomic_set(v: &fp->fi_lo_recalls, i: 0);
4387	#endif
4388	}
4389
4390	void
4391	nfsd4_free_slabs(void)
4392	{
4393	kmem_cache_destroy(s: client_slab);
4394	kmem_cache_destroy(s: openowner_slab);
4395	kmem_cache_destroy(s: lockowner_slab);
4396	kmem_cache_destroy(s: file_slab);
4397	kmem_cache_destroy(s: stateid_slab);
4398	kmem_cache_destroy(s: deleg_slab);
4399	kmem_cache_destroy(s: odstate_slab);
4400	}
4401
4402	int
4403	nfsd4_init_slabs(void)
4404	{
4405	client_slab = kmem_cache_create(name: "nfsd4_clients",
4406	size: sizeof(struct nfs4_client), align: 0, flags: 0, NULL);
4407	if (client_slab == NULL)
4408	goto out;
4409	openowner_slab = kmem_cache_create(name: "nfsd4_openowners",
4410	size: sizeof(struct nfs4_openowner), align: 0, flags: 0, NULL);
4411	if (openowner_slab == NULL)
4412	goto out_free_client_slab;
4413	lockowner_slab = kmem_cache_create(name: "nfsd4_lockowners",
4414	size: sizeof(struct nfs4_lockowner), align: 0, flags: 0, NULL);
4415	if (lockowner_slab == NULL)
4416	goto out_free_openowner_slab;
4417	file_slab = kmem_cache_create(name: "nfsd4_files",
4418	size: sizeof(struct nfs4_file), align: 0, flags: 0, NULL);
4419	if (file_slab == NULL)
4420	goto out_free_lockowner_slab;
4421	stateid_slab = kmem_cache_create(name: "nfsd4_stateids",
4422	size: sizeof(struct nfs4_ol_stateid), align: 0, flags: 0, NULL);
4423	if (stateid_slab == NULL)
4424	goto out_free_file_slab;
4425	deleg_slab = kmem_cache_create(name: "nfsd4_delegations",
4426	size: sizeof(struct nfs4_delegation), align: 0, flags: 0, NULL);
4427	if (deleg_slab == NULL)
4428	goto out_free_stateid_slab;
4429	odstate_slab = kmem_cache_create(name: "nfsd4_odstate",
4430	size: sizeof(struct nfs4_clnt_odstate), align: 0, flags: 0, NULL);
4431	if (odstate_slab == NULL)
4432	goto out_free_deleg_slab;
4433	return 0;
4434
4435	out_free_deleg_slab:
4436	kmem_cache_destroy(s: deleg_slab);
4437	out_free_stateid_slab:
4438	kmem_cache_destroy(s: stateid_slab);
4439	out_free_file_slab:
4440	kmem_cache_destroy(s: file_slab);
4441	out_free_lockowner_slab:
4442	kmem_cache_destroy(s: lockowner_slab);
4443	out_free_openowner_slab:
4444	kmem_cache_destroy(s: openowner_slab);
4445	out_free_client_slab:
4446	kmem_cache_destroy(s: client_slab);
4447	out:
4448	return -ENOMEM;
4449	}
4450
4451	static unsigned long
4452	nfsd4_state_shrinker_count(struct shrinker *shrink, struct shrink_control *sc)
4453	{
4454	int count;
4455	struct nfsd_net *nn = shrink->private_data;
4456
4457	count = atomic_read(v: &nn->nfsd_courtesy_clients);
4458	if (!count)
4459	count = atomic_long_read(v: &num_delegations);
4460	if (count)
4461	queue_work(wq: laundry_wq, work: &nn->nfsd_shrinker_work);
4462	return (unsigned long)count;
4463	}
4464
4465	static unsigned long
4466	nfsd4_state_shrinker_scan(struct shrinker *shrink, struct shrink_control *sc)
4467	{
4468	return SHRINK_STOP;
4469	}
4470
4471	void
4472	nfsd4_init_leases_net(struct nfsd_net *nn)
4473	{
4474	struct sysinfo si;
4475	u64 max_clients;
4476
4477	nn->nfsd4_lease = 90; /* default lease time */
4478	nn->nfsd4_grace = 90;
4479	nn->somebody_reclaimed = false;
4480	nn->track_reclaim_completes = false;
4481	nn->clverifier_counter = get_random_u32();
4482	nn->clientid_base = get_random_u32();
4483	nn->clientid_counter = nn->clientid_base + 1;
4484	nn->s2s_cp_cl_id = nn->clientid_counter++;
4485
4486	atomic_set(v: &nn->nfs4_client_count, i: 0);
4487	si_meminfo(val: &si);
4488	max_clients = (u64)si.totalram * si.mem_unit / (1024 * 1024 * 1024);
4489	max_clients *= NFS4_CLIENTS_PER_GB;
4490	nn->nfs4_max_clients = max_t(int, max_clients, NFS4_CLIENTS_PER_GB);
4491
4492	atomic_set(v: &nn->nfsd_courtesy_clients, i: 0);
4493	}
4494
4495	static void init_nfs4_replay(struct nfs4_replay *rp)
4496	{
4497	rp->rp_status = nfserr_serverfault;
4498	rp->rp_buflen = 0;
4499	rp->rp_buf = rp->rp_ibuf;
4500	mutex_init(&rp->rp_mutex);
4501	}
4502
4503	static void nfsd4_cstate_assign_replay(struct nfsd4_compound_state *cstate,
4504	struct nfs4_stateowner *so)
4505	{
4506	if (!nfsd4_has_session(cs: cstate)) {
4507	mutex_lock(&so->so_replay.rp_mutex);
4508	cstate->replay_owner = nfs4_get_stateowner(sop: so);
4509	}
4510	}
4511
4512	void nfsd4_cstate_clear_replay(struct nfsd4_compound_state *cstate)
4513	{
4514	struct nfs4_stateowner *so = cstate->replay_owner;
4515
4516	if (so != NULL) {
4517	cstate->replay_owner = NULL;
4518	mutex_unlock(lock: &so->so_replay.rp_mutex);
4519	nfs4_put_stateowner(sop: so);
4520	}
4521	}
4522
4523	static inline void *alloc_stateowner(struct kmem_cache *slab, struct xdr_netobj *owner, struct nfs4_client *clp)
4524	{
4525	struct nfs4_stateowner *sop;
4526
4527	sop = kmem_cache_alloc(cachep: slab, GFP_KERNEL);
4528	if (!sop)
4529	return NULL;
4530
4531	xdr_netobj_dup(dst: &sop->so_owner, src: owner, GFP_KERNEL);
4532	if (!sop->so_owner.data) {
4533	kmem_cache_free(s: slab, objp: sop);
4534	return NULL;
4535	}
4536
4537	INIT_LIST_HEAD(list: &sop->so_stateids);
4538	sop->so_client = clp;
4539	init_nfs4_replay(rp: &sop->so_replay);
4540	atomic_set(v: &sop->so_count, i: 1);
4541	return sop;
4542	}
4543
4544	static void hash_openowner(struct nfs4_openowner *oo, struct nfs4_client *clp, unsigned int strhashval)
4545	{
4546	lockdep_assert_held(&clp->cl_lock);
4547
4548	list_add(new: &oo->oo_owner.so_strhash,
4549	head: &clp->cl_ownerstr_hashtbl[strhashval]);
4550	list_add(new: &oo->oo_perclient, head: &clp->cl_openowners);
4551	}
4552
4553	static void nfs4_unhash_openowner(struct nfs4_stateowner *so)
4554	{
4555	unhash_openowner_locked(oo: openowner(so));
4556	}
4557
4558	static void nfs4_free_openowner(struct nfs4_stateowner *so)
4559	{
4560	struct nfs4_openowner *oo = openowner(so);
4561
4562	kmem_cache_free(s: openowner_slab, objp: oo);
4563	}
4564
4565	static const struct nfs4_stateowner_operations openowner_ops = {
4566	.so_unhash = nfs4_unhash_openowner,
4567	.so_free = nfs4_free_openowner,
4568	};
4569
4570	static struct nfs4_ol_stateid *
4571	nfsd4_find_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4572	{
4573	struct nfs4_ol_stateid *local, *ret = NULL;
4574	struct nfs4_openowner *oo = open->op_openowner;
4575
4576	lockdep_assert_held(&fp->fi_lock);
4577
4578	list_for_each_entry(local, &fp->fi_stateids, st_perfile) {
4579	/* ignore lock owners */
4580	if (local->st_stateowner->so_is_open_owner == 0)
4581	continue;
4582	if (local->st_stateowner != &oo->oo_owner)
4583	continue;
4584	if (local->st_stid.sc_type == NFS4_OPEN_STID) {
4585	ret = local;
4586	refcount_inc(r: &ret->st_stid.sc_count);
4587	break;
4588	}
4589	}
4590	return ret;
4591	}
4592
4593	static __be32
4594	nfsd4_verify_open_stid(struct nfs4_stid *s)
4595	{
4596	__be32 ret = nfs_ok;
4597
4598	switch (s->sc_type) {
4599	default:
4600	break;
4601	case 0:
4602	case NFS4_CLOSED_STID:
4603	case NFS4_CLOSED_DELEG_STID:
4604	ret = nfserr_bad_stateid;
4605	break;
4606	case NFS4_REVOKED_DELEG_STID:
4607	ret = nfserr_deleg_revoked;
4608	}
4609	return ret;
4610	}
4611
4612	/* Lock the stateid st_mutex, and deal with races with CLOSE */
4613	static __be32
4614	nfsd4_lock_ol_stateid(struct nfs4_ol_stateid *stp)
4615	{
4616	__be32 ret;
4617
4618	mutex_lock_nested(lock: &stp->st_mutex, subclass: LOCK_STATEID_MUTEX);
4619	ret = nfsd4_verify_open_stid(s: &stp->st_stid);
4620	if (ret != nfs_ok)
4621	mutex_unlock(lock: &stp->st_mutex);
4622	return ret;
4623	}
4624
4625	static struct nfs4_ol_stateid *
4626	nfsd4_find_and_lock_existing_open(struct nfs4_file *fp, struct nfsd4_open *open)
4627	{
4628	struct nfs4_ol_stateid *stp;
4629	for (;;) {
4630	spin_lock(lock: &fp->fi_lock);
4631	stp = nfsd4_find_existing_open(fp, open);
4632	spin_unlock(lock: &fp->fi_lock);
4633	if (!stp || nfsd4_lock_ol_stateid(stp) == nfs_ok)
4634	break;
4635	nfs4_put_stid(s: &stp->st_stid);
4636	}
4637	return stp;
4638	}
4639
4640	static struct nfs4_openowner *
4641	alloc_init_open_stateowner(unsigned int strhashval, struct nfsd4_open *open,
4642	struct nfsd4_compound_state *cstate)
4643	{
4644	struct nfs4_client *clp = cstate->clp;
4645	struct nfs4_openowner *oo, *ret;
4646
4647	oo = alloc_stateowner(slab: openowner_slab, owner: &open->op_owner, clp);
4648	if (!oo)
4649	return NULL;
4650	oo->oo_owner.so_ops = &openowner_ops;
4651	oo->oo_owner.so_is_open_owner = 1;
4652	oo->oo_owner.so_seqid = open->op_seqid;
4653	oo->oo_flags = 0;
4654	if (nfsd4_has_session(cs: cstate))
4655	oo->oo_flags |= NFS4_OO_CONFIRMED;
4656	oo->oo_time = 0;
4657	oo->oo_last_closed_stid = NULL;
4658	INIT_LIST_HEAD(list: &oo->oo_close_lru);
4659	spin_lock(lock: &clp->cl_lock);
4660	ret = find_openstateowner_str_locked(hashval: strhashval, open, clp);
4661	if (ret == NULL) {
4662	hash_openowner(oo, clp, strhashval);
4663	ret = oo;
4664	} else
4665	nfs4_free_stateowner(sop: &oo->oo_owner);
4666
4667	spin_unlock(lock: &clp->cl_lock);
4668	return ret;
4669	}
4670
4671	static struct nfs4_ol_stateid *
4672	init_open_stateid(struct nfs4_file *fp, struct nfsd4_open *open)
4673	{
4674
4675	struct nfs4_openowner *oo = open->op_openowner;
4676	struct nfs4_ol_stateid *retstp = NULL;
4677	struct nfs4_ol_stateid *stp;
4678
4679	stp = open->op_stp;
4680	/* We are moving these outside of the spinlocks to avoid the warnings */
4681	mutex_init(&stp->st_mutex);
4682	mutex_lock_nested(lock: &stp->st_mutex, subclass: OPEN_STATEID_MUTEX);
4683
4684	retry:
4685	spin_lock(lock: &oo->oo_owner.so_client->cl_lock);
4686	spin_lock(lock: &fp->fi_lock);
4687
4688	retstp = nfsd4_find_existing_open(fp, open);
4689	if (retstp)
4690	goto out_unlock;
4691
4692	open->op_stp = NULL;
4693	refcount_inc(r: &stp->st_stid.sc_count);
4694	stp->st_stid.sc_type = NFS4_OPEN_STID;
4695	INIT_LIST_HEAD(list: &stp->st_locks);
4696	stp->st_stateowner = nfs4_get_stateowner(sop: &oo->oo_owner);
4697	get_nfs4_file(fi: fp);
4698	stp->st_stid.sc_file = fp;
4699	stp->st_access_bmap = 0;
4700	stp->st_deny_bmap = 0;
4701	stp->st_openstp = NULL;
4702	list_add(new: &stp->st_perstateowner, head: &oo->oo_owner.so_stateids);
4703	list_add(new: &stp->st_perfile, head: &fp->fi_stateids);
4704
4705	out_unlock:
4706	spin_unlock(lock: &fp->fi_lock);
4707	spin_unlock(lock: &oo->oo_owner.so_client->cl_lock);
4708	if (retstp) {
4709	/* Handle races with CLOSE */
4710	if (nfsd4_lock_ol_stateid(stp: retstp) != nfs_ok) {
4711	nfs4_put_stid(s: &retstp->st_stid);
4712	goto retry;
4713	}
4714	/* To keep mutex tracking happy */
4715	mutex_unlock(lock: &stp->st_mutex);
4716	stp = retstp;
4717	}
4718	return stp;
4719	}
4720
4721	/*
4722	* In the 4.0 case we need to keep the owners around a little while to handle
4723	* CLOSE replay. We still do need to release any file access that is held by
4724	* them before returning however.
4725	*/
4726	static void
4727	move_to_close_lru(struct nfs4_ol_stateid *s, struct net *net)
4728	{
4729	struct nfs4_ol_stateid *last;
4730	struct nfs4_openowner *oo = openowner(so: s->st_stateowner);
4731	struct nfsd_net *nn = net_generic(net: s->st_stid.sc_client->net,
4732	id: nfsd_net_id);
4733
4734	dprintk("NFSD: move_to_close_lru nfs4_openowner %p\n", oo);
4735
4736	/*
4737	* We know that we hold one reference via nfsd4_close, and another
4738	* "persistent" reference for the client. If the refcount is higher
4739	* than 2, then there are still calls in progress that are using this
4740	* stateid. We can't put the sc_file reference until they are finished.
4741	* Wait for the refcount to drop to 2. Since it has been unhashed,
4742	* there should be no danger of the refcount going back up again at
4743	* this point.
4744	*/
4745	wait_event(close_wq, refcount_read(&s->st_stid.sc_count) == 2);
4746
4747	release_all_access(stp: s);
4748	if (s->st_stid.sc_file) {
4749	put_nfs4_file(fi: s->st_stid.sc_file);
4750	s->st_stid.sc_file = NULL;
4751	}
4752
4753	spin_lock(lock: &nn->client_lock);
4754	last = oo->oo_last_closed_stid;
4755	oo->oo_last_closed_stid = s;
4756	list_move_tail(list: &oo->oo_close_lru, head: &nn->close_lru);
4757	oo->oo_time = ktime_get_boottime_seconds();
4758	spin_unlock(lock: &nn->client_lock);
4759	if (last)
4760	nfs4_put_stid(s: &last->st_stid);
4761	}
4762
4763	static noinline_for_stack struct nfs4_file *
4764	nfsd4_file_hash_lookup(const struct svc_fh *fhp)
4765	{
4766	struct inode *inode = d_inode(dentry: fhp->fh_dentry);
4767	struct rhlist_head *tmp, *list;
4768	struct nfs4_file *fi;
4769
4770	rcu_read_lock();
4771	list = rhltable_lookup(hlt: &nfs4_file_rhltable, key: &inode,
4772	params: nfs4_file_rhash_params);
4773	rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
4774	if (fh_match(fh1: &fi->fi_fhandle, fh2: &fhp->fh_handle)) {
4775	if (refcount_inc_not_zero(r: &fi->fi_ref)) {
4776	rcu_read_unlock();
4777	return fi;
4778	}
4779	}
4780	}
4781	rcu_read_unlock();
4782	return NULL;
4783	}
4784
4785	/*
4786	* On hash insertion, identify entries with the same inode but
4787	* distinct filehandles. They will all be on the list returned
4788	* by rhltable_lookup().
4789	*
4790	* inode->i_lock prevents racing insertions from adding an entry
4791	* for the same inode/fhp pair twice.
4792	*/
4793	static noinline_for_stack struct nfs4_file *
4794	nfsd4_file_hash_insert(struct nfs4_file *new, const struct svc_fh *fhp)
4795	{
4796	struct inode *inode = d_inode(dentry: fhp->fh_dentry);
4797	struct rhlist_head *tmp, *list;
4798	struct nfs4_file *ret = NULL;
4799	bool alias_found = false;
4800	struct nfs4_file *fi;
4801	int err;
4802
4803	rcu_read_lock();
4804	spin_lock(lock: &inode->i_lock);
4805
4806	list = rhltable_lookup(hlt: &nfs4_file_rhltable, key: &inode,
4807	params: nfs4_file_rhash_params);
4808	rhl_for_each_entry_rcu(fi, tmp, list, fi_rlist) {
4809	if (fh_match(fh1: &fi->fi_fhandle, fh2: &fhp->fh_handle)) {
4810	if (refcount_inc_not_zero(r: &fi->fi_ref))
4811	ret = fi;
4812	} else
4813	fi->fi_aliased = alias_found = true;
4814	}
4815	if (ret)
4816	goto out_unlock;
4817
4818	nfsd4_file_init(fh: fhp, fp: new);
4819	err = rhltable_insert(hlt: &nfs4_file_rhltable, list: &new->fi_rlist,
4820	params: nfs4_file_rhash_params);
4821	if (err)
4822	goto out_unlock;
4823
4824	new->fi_aliased = alias_found;
4825	ret = new;
4826
4827	out_unlock:
4828	spin_unlock(lock: &inode->i_lock);
4829	rcu_read_unlock();
4830	return ret;
4831	}
4832
4833	static noinline_for_stack void nfsd4_file_hash_remove(struct nfs4_file *fi)
4834	{
4835	rhltable_remove(hlt: &nfs4_file_rhltable, list: &fi->fi_rlist,
4836	params: nfs4_file_rhash_params);
4837	}
4838
4839	/*
4840	* Called to check deny when READ with all zero stateid or
4841	* WRITE with all zero or all one stateid
4842	*/
4843	static __be32
4844	nfs4_share_conflict(struct svc_fh *current_fh, unsigned int deny_type)
4845	{
4846	struct nfs4_file *fp;
4847	__be32 ret = nfs_ok;
4848
4849	fp = nfsd4_file_hash_lookup(fhp: current_fh);
4850	if (!fp)
4851	return ret;
4852
4853	/* Check for conflicting share reservations */
4854	spin_lock(lock: &fp->fi_lock);
4855	if (fp->fi_share_deny & deny_type)
4856	ret = nfserr_locked;
4857	spin_unlock(lock: &fp->fi_lock);
4858	put_nfs4_file(fi: fp);
4859	return ret;
4860	}
4861
4862	static bool nfsd4_deleg_present(const struct inode *inode)
4863	{
4864	struct file_lock_context *ctx = locks_inode_context(inode);
4865
4866	return ctx && !list_empty_careful(head: &ctx->flc_lease);
4867	}
4868
4869	/**
4870	* nfsd_wait_for_delegreturn - wait for delegations to be returned
4871	* @rqstp: the RPC transaction being executed
4872	* @inode: in-core inode of the file being waited for
4873	*
4874	* The timeout prevents deadlock if all nfsd threads happen to be
4875	* tied up waiting for returning delegations.
4876	*
4877	* Return values:
4878	* %true: delegation was returned
4879	* %false: timed out waiting for delegreturn
4880	*/
4881	bool nfsd_wait_for_delegreturn(struct svc_rqst *rqstp, struct inode *inode)
4882	{
4883	long __maybe_unused timeo;
4884
4885	timeo = wait_var_event_timeout(inode, !nfsd4_deleg_present(inode),
4886	NFSD_DELEGRETURN_TIMEOUT);
4887	trace_nfsd_delegret_wakeup(rqstp, inode, timeo);
4888	return timeo > 0;
4889	}
4890
4891	static void nfsd4_cb_recall_prepare(struct nfsd4_callback *cb)
4892	{
4893	struct nfs4_delegation *dp = cb_to_delegation(cb);
4894	struct nfsd_net *nn = net_generic(net: dp->dl_stid.sc_client->net,
4895	id: nfsd_net_id);
4896
4897	block_delegations(fh: &dp->dl_stid.sc_file->fi_fhandle);
4898
4899	/*
4900	* We can't do this in nfsd_break_deleg_cb because it is
4901	* already holding inode->i_lock.
4902	*
4903	* If the dl_time != 0, then we know that it has already been
4904	* queued for a lease break. Don't queue it again.
4905	*/
4906	spin_lock(lock: &state_lock);
4907	if (delegation_hashed(dp) && dp->dl_time == 0) {
4908	dp->dl_time = ktime_get_boottime_seconds();
4909	list_add_tail(new: &dp->dl_recall_lru, head: &nn->del_recall_lru);
4910	}
4911	spin_unlock(lock: &state_lock);
4912	}
4913
4914	static int nfsd4_cb_recall_done(struct nfsd4_callback *cb,
4915	struct rpc_task *task)
4916	{
4917	struct nfs4_delegation *dp = cb_to_delegation(cb);
4918
4919	trace_nfsd_cb_recall_done(stp: &dp->dl_stid.sc_stateid, task);
4920
4921	if (dp->dl_stid.sc_type == NFS4_CLOSED_DELEG_STID ||
4922	dp->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID)
4923	return 1;
4924
4925	switch (task->tk_status) {
4926	case 0:
4927	return 1;
4928	case -NFS4ERR_DELAY:
4929	rpc_delay(task, 2 * HZ);
4930	return 0;
4931	case -EBADHANDLE:
4932	case -NFS4ERR_BAD_STATEID:
4933	/*
4934	* Race: client probably got cb_recall before open reply
4935	* granting delegation.
4936	*/
4937	if (dp->dl_retries--) {
4938	rpc_delay(task, 2 * HZ);
4939	return 0;
4940	}
4941	fallthrough;
4942	default:
4943	return 1;
4944	}
4945	}
4946
4947	static void nfsd4_cb_recall_release(struct nfsd4_callback *cb)
4948	{
4949	struct nfs4_delegation *dp = cb_to_delegation(cb);
4950
4951	nfs4_put_stid(s: &dp->dl_stid);
4952	}
4953
4954	static const struct nfsd4_callback_ops nfsd4_cb_recall_ops = {
4955	.prepare = nfsd4_cb_recall_prepare,
4956	.done = nfsd4_cb_recall_done,
4957	.release = nfsd4_cb_recall_release,
4958	};
4959
4960	static void nfsd_break_one_deleg(struct nfs4_delegation *dp)
4961	{
4962	/*
4963	* We're assuming the state code never drops its reference
4964	* without first removing the lease. Since we're in this lease
4965	* callback (and since the lease code is serialized by the
4966	* flc_lock) we know the server hasn't removed the lease yet, and
4967	* we know it's safe to take a reference.
4968	*/
4969	refcount_inc(r: &dp->dl_stid.sc_count);
4970	WARN_ON_ONCE(!nfsd4_run_cb(&dp->dl_recall));
4971	}
4972
4973	/* Called from break_lease() with flc_lock held. */
4974	static bool
4975	nfsd_break_deleg_cb(struct file_lock *fl)
4976	{
4977	struct nfs4_delegation *dp = (struct nfs4_delegation *)fl->fl_owner;
4978	struct nfs4_file *fp = dp->dl_stid.sc_file;
4979	struct nfs4_client *clp = dp->dl_stid.sc_client;
4980	struct nfsd_net *nn;
4981
4982	trace_nfsd_cb_recall(stid: &dp->dl_stid);
4983
4984	dp->dl_recalled = true;
4985	atomic_inc(v: &clp->cl_delegs_in_recall);
4986	if (try_to_expire_client(clp)) {
4987	nn = net_generic(net: clp->net, id: nfsd_net_id);
4988	mod_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: 0);
4989	}
4990
4991	/*
4992	* We don't want the locks code to timeout the lease for us;
4993	* we'll remove it ourself if a delegation isn't returned
4994	* in time:
4995	*/
4996	fl->fl_break_time = 0;
4997
4998	spin_lock(lock: &fp->fi_lock);
4999	fp->fi_had_conflict = true;
5000	nfsd_break_one_deleg(dp);
5001	spin_unlock(lock: &fp->fi_lock);
5002	return false;
5003	}
5004
5005	/**
5006	* nfsd_breaker_owns_lease - Check if lease conflict was resolved
5007	* @fl: Lock state to check
5008	*
5009	* Return values:
5010	* %true: Lease conflict was resolved
5011	* %false: Lease conflict was not resolved.
5012	*/
5013	static bool nfsd_breaker_owns_lease(struct file_lock *fl)
5014	{
5015	struct nfs4_delegation *dl = fl->fl_owner;
5016	struct svc_rqst *rqst;
5017	struct nfs4_client *clp;
5018
5019	if (!i_am_nfsd())
5020	return false;
5021	rqst = kthread_data(current);
5022	/* Note rq_prog == NFS_ACL_PROGRAM is also possible: */
5023	if (rqst->rq_prog != NFS_PROGRAM || rqst->rq_vers < 4)
5024	return false;
5025	clp = *(rqst->rq_lease_breaker);
5026	return dl->dl_stid.sc_client == clp;
5027	}
5028
5029	static int
5030	nfsd_change_deleg_cb(struct file_lock *onlist, int arg,
5031	struct list_head *dispose)
5032	{
5033	struct nfs4_delegation *dp = (struct nfs4_delegation *)onlist->fl_owner;
5034	struct nfs4_client *clp = dp->dl_stid.sc_client;
5035
5036	if (arg & F_UNLCK) {
5037	if (dp->dl_recalled)
5038	atomic_dec(v: &clp->cl_delegs_in_recall);
5039	return lease_modify(onlist, arg, dispose);
5040	} else
5041	return -EAGAIN;
5042	}
5043
5044	static const struct lock_manager_operations nfsd_lease_mng_ops = {
5045	.lm_breaker_owns_lease = nfsd_breaker_owns_lease,
5046	.lm_break = nfsd_break_deleg_cb,
5047	.lm_change = nfsd_change_deleg_cb,
5048	};
5049
5050	static __be32 nfsd4_check_seqid(struct nfsd4_compound_state *cstate, struct nfs4_stateowner *so, u32 seqid)
5051	{
5052	if (nfsd4_has_session(cs: cstate))
5053	return nfs_ok;
5054	if (seqid == so->so_seqid - 1)
5055	return nfserr_replay_me;
5056	if (seqid == so->so_seqid)
5057	return nfs_ok;
5058	return nfserr_bad_seqid;
5059	}
5060
5061	static struct nfs4_client *lookup_clientid(clientid_t *clid, bool sessions,
5062	struct nfsd_net *nn)
5063	{
5064	struct nfs4_client *found;
5065
5066	spin_lock(lock: &nn->client_lock);
5067	found = find_confirmed_client(clid, sessions, nn);
5068	if (found)
5069	atomic_inc(v: &found->cl_rpc_users);
5070	spin_unlock(lock: &nn->client_lock);
5071	return found;
5072	}
5073
5074	static __be32 set_client(clientid_t *clid,
5075	struct nfsd4_compound_state *cstate,
5076	struct nfsd_net *nn)
5077	{
5078	if (cstate->clp) {
5079	if (!same_clid(cl1: &cstate->clp->cl_clientid, cl2: clid))
5080	return nfserr_stale_clientid;
5081	return nfs_ok;
5082	}
5083	if (STALE_CLIENTID(clid, nn))
5084	return nfserr_stale_clientid;
5085	/*
5086	* We're in the 4.0 case (otherwise the SEQUENCE op would have
5087	* set cstate->clp), so session = false:
5088	*/
5089	cstate->clp = lookup_clientid(clid, sessions: false, nn);
5090	if (!cstate->clp)
5091	return nfserr_expired;
5092	return nfs_ok;
5093	}
5094
5095	__be32
5096	nfsd4_process_open1(struct nfsd4_compound_state *cstate,
5097	struct nfsd4_open *open, struct nfsd_net *nn)
5098	{
5099	clientid_t *clientid = &open->op_clientid;
5100	struct nfs4_client *clp = NULL;
5101	unsigned int strhashval;
5102	struct nfs4_openowner *oo = NULL;
5103	__be32 status;
5104
5105	/*
5106	* In case we need it later, after we've already created the
5107	* file and don't want to risk a further failure:
5108	*/
5109	open->op_file = nfsd4_alloc_file();
5110	if (open->op_file == NULL)
5111	return nfserr_jukebox;
5112
5113	status = set_client(clid: clientid, cstate, nn);
5114	if (status)
5115	return status;
5116	clp = cstate->clp;
5117
5118	strhashval = ownerstr_hashval(ownername: &open->op_owner);
5119	oo = find_openstateowner_str(hashval: strhashval, open, clp);
5120	open->op_openowner = oo;
5121	if (!oo) {
5122	goto new_owner;
5123	}
5124	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
5125	/* Replace unconfirmed owners without checking for replay. */
5126	release_openowner(oo);
5127	open->op_openowner = NULL;
5128	goto new_owner;
5129	}
5130	status = nfsd4_check_seqid(cstate, so: &oo->oo_owner, seqid: open->op_seqid);
5131	if (status)
5132	return status;
5133	goto alloc_stateid;
5134	new_owner:
5135	oo = alloc_init_open_stateowner(strhashval, open, cstate);
5136	if (oo == NULL)
5137	return nfserr_jukebox;
5138	open->op_openowner = oo;
5139	alloc_stateid:
5140	open->op_stp = nfs4_alloc_open_stateid(clp);
5141	if (!open->op_stp)
5142	return nfserr_jukebox;
5143
5144	if (nfsd4_has_session(cs: cstate) &&
5145	(cstate->current_fh.fh_export->ex_flags & NFSEXP_PNFS)) {
5146	open->op_odstate = alloc_clnt_odstate(clp);
5147	if (!open->op_odstate)
5148	return nfserr_jukebox;
5149	}
5150
5151	return nfs_ok;
5152	}
5153
5154	static inline __be32
5155	nfs4_check_delegmode(struct nfs4_delegation *dp, int flags)
5156	{
5157	if ((flags & WR_STATE) && (dp->dl_type == NFS4_OPEN_DELEGATE_READ))
5158	return nfserr_openmode;
5159	else
5160	return nfs_ok;
5161	}
5162
5163	static int share_access_to_flags(u32 share_access)
5164	{
5165	return share_access == NFS4_SHARE_ACCESS_READ ? RD_STATE : WR_STATE;
5166	}
5167
5168	static struct nfs4_delegation *find_deleg_stateid(struct nfs4_client *cl, stateid_t *s)
5169	{
5170	struct nfs4_stid *ret;
5171
5172	ret = find_stateid_by_type(cl, t: s,
5173	NFS4_DELEG_STID|NFS4_REVOKED_DELEG_STID);
5174	if (!ret)
5175	return NULL;
5176	return delegstateid(s: ret);
5177	}
5178
5179	static bool nfsd4_is_deleg_cur(struct nfsd4_open *open)
5180	{
5181	return open->op_claim_type == NFS4_OPEN_CLAIM_DELEGATE_CUR ||
5182	open->op_claim_type == NFS4_OPEN_CLAIM_DELEG_CUR_FH;
5183	}
5184
5185	static __be32
5186	nfs4_check_deleg(struct nfs4_client *cl, struct nfsd4_open *open,
5187	struct nfs4_delegation **dp)
5188	{
5189	int flags;
5190	__be32 status = nfserr_bad_stateid;
5191	struct nfs4_delegation *deleg;
5192
5193	deleg = find_deleg_stateid(cl, s: &open->op_delegate_stateid);
5194	if (deleg == NULL)
5195	goto out;
5196	if (deleg->dl_stid.sc_type == NFS4_REVOKED_DELEG_STID) {
5197	nfs4_put_stid(s: &deleg->dl_stid);
5198	if (cl->cl_minorversion)
5199	status = nfserr_deleg_revoked;
5200	goto out;
5201	}
5202	flags = share_access_to_flags(share_access: open->op_share_access);
5203	status = nfs4_check_delegmode(dp: deleg, flags);
5204	if (status) {
5205	nfs4_put_stid(s: &deleg->dl_stid);
5206	goto out;
5207	}
5208	*dp = deleg;
5209	out:
5210	if (!nfsd4_is_deleg_cur(open))
5211	return nfs_ok;
5212	if (status)
5213	return status;
5214	open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5215	return nfs_ok;
5216	}
5217
5218	static inline int nfs4_access_to_access(u32 nfs4_access)
5219	{
5220	int flags = 0;
5221
5222	if (nfs4_access & NFS4_SHARE_ACCESS_READ)
5223	flags |= NFSD_MAY_READ;
5224	if (nfs4_access & NFS4_SHARE_ACCESS_WRITE)
5225	flags |= NFSD_MAY_WRITE;
5226	return flags;
5227	}
5228
5229	static inline __be32
5230	nfsd4_truncate(struct svc_rqst *rqstp, struct svc_fh *fh,
5231	struct nfsd4_open *open)
5232	{
5233	struct iattr iattr = {
5234	.ia_valid = ATTR_SIZE,
5235	.ia_size = 0,
5236	};
5237	struct nfsd_attrs attrs = {
5238	.na_iattr = &iattr,
5239	};
5240	if (!open->op_truncate)
5241	return 0;
5242	if (!(open->op_share_access & NFS4_SHARE_ACCESS_WRITE))
5243	return nfserr_inval;
5244	return nfsd_setattr(rqstp, fh, &attrs, 0, (time64_t)0);
5245	}
5246
5247	static __be32 nfs4_get_vfs_file(struct svc_rqst *rqstp, struct nfs4_file *fp,
5248	struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5249	struct nfsd4_open *open, bool new_stp)
5250	{
5251	struct nfsd_file *nf = NULL;
5252	__be32 status;
5253	int oflag = nfs4_access_to_omode(access: open->op_share_access);
5254	int access = nfs4_access_to_access(nfs4_access: open->op_share_access);
5255	unsigned char old_access_bmap, old_deny_bmap;
5256
5257	spin_lock(lock: &fp->fi_lock);
5258
5259	/*
5260	* Are we trying to set a deny mode that would conflict with
5261	* current access?
5262	*/
5263	status = nfs4_file_check_deny(fp, deny: open->op_share_deny);
5264	if (status != nfs_ok) {
5265	if (status != nfserr_share_denied) {
5266	spin_unlock(lock: &fp->fi_lock);
5267	goto out;
5268	}
5269	if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5270	stp, access: open->op_share_deny, share_access: false))
5271	status = nfserr_jukebox;
5272	spin_unlock(lock: &fp->fi_lock);
5273	goto out;
5274	}
5275
5276	/* set access to the file */
5277	status = nfs4_file_get_access(fp, access: open->op_share_access);
5278	if (status != nfs_ok) {
5279	if (status != nfserr_share_denied) {
5280	spin_unlock(lock: &fp->fi_lock);
5281	goto out;
5282	}
5283	if (nfs4_resolve_deny_conflicts_locked(fp, new_stp,
5284	stp, access: open->op_share_access, share_access: true))
5285	status = nfserr_jukebox;
5286	spin_unlock(lock: &fp->fi_lock);
5287	goto out;
5288	}
5289
5290	/* Set access bits in stateid */
5291	old_access_bmap = stp->st_access_bmap;
5292	set_access(access: open->op_share_access, stp);
5293
5294	/* Set new deny mask */
5295	old_deny_bmap = stp->st_deny_bmap;
5296	set_deny(deny: open->op_share_deny, stp);
5297	fp->fi_share_deny |= (open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5298
5299	if (!fp->fi_fds[oflag]) {
5300	spin_unlock(lock: &fp->fi_lock);
5301
5302	status = nfsd_file_acquire_opened(rqstp, fhp: cur_fh, may_flags: access,
5303	file: open->op_filp, nfp: &nf);
5304	if (status != nfs_ok)
5305	goto out_put_access;
5306
5307	spin_lock(lock: &fp->fi_lock);
5308	if (!fp->fi_fds[oflag]) {
5309	fp->fi_fds[oflag] = nf;
5310	nf = NULL;
5311	}
5312	}
5313	spin_unlock(lock: &fp->fi_lock);
5314	if (nf)
5315	nfsd_file_put(nf);
5316
5317	status = nfserrno(errno: nfsd_open_break_lease(cur_fh->fh_dentry->d_inode,
5318	access));
5319	if (status)
5320	goto out_put_access;
5321
5322	status = nfsd4_truncate(rqstp, fh: cur_fh, open);
5323	if (status)
5324	goto out_put_access;
5325	out:
5326	return status;
5327	out_put_access:
5328	stp->st_access_bmap = old_access_bmap;
5329	nfs4_file_put_access(fp, access: open->op_share_access);
5330	reset_union_bmap_deny(deny: bmap_to_share_mode(bmap: old_deny_bmap), stp);
5331	goto out;
5332	}
5333
5334	static __be32
5335	nfs4_upgrade_open(struct svc_rqst *rqstp, struct nfs4_file *fp,
5336	struct svc_fh *cur_fh, struct nfs4_ol_stateid *stp,
5337	struct nfsd4_open *open)
5338	{
5339	__be32 status;
5340	unsigned char old_deny_bmap = stp->st_deny_bmap;
5341
5342	if (!test_access(access: open->op_share_access, stp))
5343	return nfs4_get_vfs_file(rqstp, fp, cur_fh, stp, open, new_stp: false);
5344
5345	/* test and set deny mode */
5346	spin_lock(lock: &fp->fi_lock);
5347	status = nfs4_file_check_deny(fp, deny: open->op_share_deny);
5348	switch (status) {
5349	case nfs_ok:
5350	set_deny(deny: open->op_share_deny, stp);
5351	fp->fi_share_deny |=
5352	(open->op_share_deny & NFS4_SHARE_DENY_BOTH);
5353	break;
5354	case nfserr_share_denied:
5355	if (nfs4_resolve_deny_conflicts_locked(fp, new_stp: false,
5356	stp, access: open->op_share_deny, share_access: false))
5357	status = nfserr_jukebox;
5358	break;
5359	}
5360	spin_unlock(lock: &fp->fi_lock);
5361
5362	if (status != nfs_ok)
5363	return status;
5364
5365	status = nfsd4_truncate(rqstp, fh: cur_fh, open);
5366	if (status != nfs_ok)
5367	reset_union_bmap_deny(deny: old_deny_bmap, stp);
5368	return status;
5369	}
5370
5371	/* Should we give out recallable state?: */
5372	static bool nfsd4_cb_channel_good(struct nfs4_client *clp)
5373	{
5374	if (clp->cl_cb_state == NFSD4_CB_UP)
5375	return true;
5376	/*
5377	* In the sessions case, since we don't have to establish a
5378	* separate connection for callbacks, we assume it's OK
5379	* until we hear otherwise:
5380	*/
5381	return clp->cl_minorversion && clp->cl_cb_state == NFSD4_CB_UNKNOWN;
5382	}
5383
5384	static struct file_lock *nfs4_alloc_init_lease(struct nfs4_delegation *dp,
5385	int flag)
5386	{
5387	struct file_lock *fl;
5388
5389	fl = locks_alloc_lock();
5390	if (!fl)
5391	return NULL;
5392	fl->fl_lmops = &nfsd_lease_mng_ops;
5393	fl->fl_flags = FL_DELEG;
5394	fl->fl_type = flag == NFS4_OPEN_DELEGATE_READ? F_RDLCK: F_WRLCK;
5395	fl->fl_end = OFFSET_MAX;
5396	fl->fl_owner = (fl_owner_t)dp;
5397	fl->fl_pid = current->tgid;
5398	fl->fl_file = dp->dl_stid.sc_file->fi_deleg_file->nf_file;
5399	return fl;
5400	}
5401
5402	static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
5403	struct nfs4_file *fp)
5404	{
5405	struct nfs4_ol_stateid *st;
5406	struct file *f = fp->fi_deleg_file->nf_file;
5407	struct inode *ino = file_inode(f);
5408	int writes;
5409
5410	writes = atomic_read(v: &ino->i_writecount);
5411	if (!writes)
5412	return 0;
5413	/*
5414	* There could be multiple filehandles (hence multiple
5415	* nfs4_files) referencing this file, but that's not too
5416	* common; let's just give up in that case rather than
5417	* trying to go look up all the clients using that other
5418	* nfs4_file as well:
5419	*/
5420	if (fp->fi_aliased)
5421	return -EAGAIN;
5422	/*
5423	* If there's a close in progress, make sure that we see it
5424	* clear any fi_fds[] entries before we see it decrement
5425	* i_writecount:
5426	*/
5427	smp_mb__after_atomic();
5428
5429	if (fp->fi_fds[O_WRONLY])
5430	writes--;
5431	if (fp->fi_fds[O_RDWR])
5432	writes--;
5433	if (writes > 0)
5434	return -EAGAIN; /* There may be non-NFSv4 writers */
5435	/*
5436	* It's possible there are non-NFSv4 write opens in progress,
5437	* but if they haven't incremented i_writecount yet then they
5438	* also haven't called break lease yet; so, they'll break this
5439	* lease soon enough. So, all that's left to check for is NFSv4
5440	* opens:
5441	*/
5442	spin_lock(lock: &fp->fi_lock);
5443	list_for_each_entry(st, &fp->fi_stateids, st_perfile) {
5444	if (st->st_openstp == NULL /* it's an open */ &&
5445	access_permit_write(stp: st) &&
5446	st->st_stid.sc_client != clp) {
5447	spin_unlock(lock: &fp->fi_lock);
5448	return -EAGAIN;
5449	}
5450	}
5451	spin_unlock(lock: &fp->fi_lock);
5452	/*
5453	* There's a small chance that we could be racing with another
5454	* NFSv4 open. However, any open that hasn't added itself to
5455	* the fi_stateids list also hasn't called break_lease yet; so,
5456	* they'll break this lease soon enough.
5457	*/
5458	return 0;
5459	}
5460
5461	/*
5462	* It's possible that between opening the dentry and setting the delegation,
5463	* that it has been renamed or unlinked. Redo the lookup to verify that this
5464	* hasn't happened.
5465	*/
5466	static int
5467	nfsd4_verify_deleg_dentry(struct nfsd4_open *open, struct nfs4_file *fp,
5468	struct svc_fh *parent)
5469	{
5470	struct svc_export *exp;
5471	struct dentry *child;
5472	__be32 err;
5473
5474	err = nfsd_lookup_dentry(open->op_rqstp, parent,
5475	open->op_fname, open->op_fnamelen,
5476	&exp, &child);
5477
5478	if (err)
5479	return -EAGAIN;
5480
5481	exp_put(exp);
5482	dput(child);
5483	if (child != file_dentry(file: fp->fi_deleg_file->nf_file))
5484	return -EAGAIN;
5485
5486	return 0;
5487	}
5488
5489	/*
5490	* We avoid breaking delegations held by a client due to its own activity, but
5491	* clearing setuid/setgid bits on a write is an implicit activity and the client
5492	* may not notice and continue using the old mode. Avoid giving out a delegation
5493	* on setuid/setgid files when the client is requesting an open for write.
5494	*/
5495	static int
5496	nfsd4_verify_setuid_write(struct nfsd4_open *open, struct nfsd_file *nf)
5497	{
5498	struct inode *inode = file_inode(f: nf->nf_file);
5499
5500	if ((open->op_share_access & NFS4_SHARE_ACCESS_WRITE) &&
5501	(inode->i_mode & (S_ISUID|S_ISGID)))
5502	return -EAGAIN;
5503	return 0;
5504	}
5505
5506	static struct nfs4_delegation *
5507	nfs4_set_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5508	struct svc_fh *parent)
5509	{
5510	int status = 0;
5511	struct nfs4_client *clp = stp->st_stid.sc_client;
5512	struct nfs4_file *fp = stp->st_stid.sc_file;
5513	struct nfs4_clnt_odstate *odstate = stp->st_clnt_odstate;
5514	struct nfs4_delegation *dp;
5515	struct nfsd_file *nf = NULL;
5516	struct file_lock *fl;
5517	u32 dl_type;
5518
5519	/*
5520	* The fi_had_conflict and nfs_get_existing_delegation checks
5521	* here are just optimizations; we'll need to recheck them at
5522	* the end:
5523	*/
5524	if (fp->fi_had_conflict)
5525	return ERR_PTR(error: -EAGAIN);
5526
5527	/*
5528	* Try for a write delegation first. RFC8881 section 10.4 says:
5529	*
5530	* "An OPEN_DELEGATE_WRITE delegation allows the client to handle,
5531	* on its own, all opens."
5532	*
5533	* Furthermore the client can use a write delegation for most READ
5534	* operations as well, so we require a O_RDWR file here.
5535	*
5536	* Offer a write delegation in the case of a BOTH open, and ensure
5537	* we get the O_RDWR descriptor.
5538	*/
5539	if ((open->op_share_access & NFS4_SHARE_ACCESS_BOTH) == NFS4_SHARE_ACCESS_BOTH) {
5540	nf = find_rw_file(f: fp);
5541	dl_type = NFS4_OPEN_DELEGATE_WRITE;
5542	}
5543
5544	/*
5545	* If the file is being opened O_RDONLY or we couldn't get a O_RDWR
5546	* file for some reason, then try for a read delegation instead.
5547	*/
5548	if (!nf && (open->op_share_access & NFS4_SHARE_ACCESS_READ)) {
5549	nf = find_readable_file(f: fp);
5550	dl_type = NFS4_OPEN_DELEGATE_READ;
5551	}
5552
5553	if (!nf)
5554	return ERR_PTR(error: -EAGAIN);
5555
5556	spin_lock(lock: &state_lock);
5557	spin_lock(lock: &fp->fi_lock);
5558	if (nfs4_delegation_exists(clp, fp))
5559	status = -EAGAIN;
5560	else if (nfsd4_verify_setuid_write(open, nf))
5561	status = -EAGAIN;
5562	else if (!fp->fi_deleg_file) {
5563	fp->fi_deleg_file = nf;
5564	/* increment early to prevent fi_deleg_file from being
5565	* cleared */
5566	fp->fi_delegees = 1;
5567	nf = NULL;
5568	} else
5569	fp->fi_delegees++;
5570	spin_unlock(lock: &fp->fi_lock);
5571	spin_unlock(lock: &state_lock);
5572	if (nf)
5573	nfsd_file_put(nf);
5574	if (status)
5575	return ERR_PTR(error: status);
5576
5577	status = -ENOMEM;
5578	dp = alloc_init_deleg(clp, fp, odstate, dl_type);
5579	if (!dp)
5580	goto out_delegees;
5581
5582	fl = nfs4_alloc_init_lease(dp, flag: dl_type);
5583	if (!fl)
5584	goto out_clnt_odstate;
5585
5586	status = vfs_setlease(fp->fi_deleg_file->nf_file, fl->fl_type, &fl, NULL);
5587	if (fl)
5588	locks_free_lock(fl);
5589	if (status)
5590	goto out_clnt_odstate;
5591
5592	if (parent) {
5593	status = nfsd4_verify_deleg_dentry(open, fp, parent);
5594	if (status)
5595	goto out_unlock;
5596	}
5597
5598	status = nfsd4_check_conflicting_opens(clp, fp);
5599	if (status)
5600	goto out_unlock;
5601
5602	/*
5603	* Now that the deleg is set, check again to ensure that nothing
5604	* raced in and changed the mode while we weren't lookng.
5605	*/
5606	status = nfsd4_verify_setuid_write(open, nf: fp->fi_deleg_file);
5607	if (status)
5608	goto out_unlock;
5609
5610	spin_lock(lock: &state_lock);
5611	spin_lock(lock: &fp->fi_lock);
5612	if (fp->fi_had_conflict)
5613	status = -EAGAIN;
5614	else
5615	status = hash_delegation_locked(dp, fp);
5616	spin_unlock(lock: &fp->fi_lock);
5617	spin_unlock(lock: &state_lock);
5618
5619	if (status)
5620	goto out_unlock;
5621
5622	return dp;
5623	out_unlock:
5624	vfs_setlease(fp->fi_deleg_file->nf_file, F_UNLCK, NULL, (void **)&dp);
5625	out_clnt_odstate:
5626	put_clnt_odstate(co: dp->dl_clnt_odstate);
5627	nfs4_put_stid(s: &dp->dl_stid);
5628	out_delegees:
5629	put_deleg_file(fp);
5630	return ERR_PTR(error: status);
5631	}
5632
5633	static void nfsd4_open_deleg_none_ext(struct nfsd4_open *open, int status)
5634	{
5635	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5636	if (status == -EAGAIN)
5637	open->op_why_no_deleg = WND4_CONTENTION;
5638	else {
5639	open->op_why_no_deleg = WND4_RESOURCE;
5640	switch (open->op_deleg_want) {
5641	case NFS4_SHARE_WANT_READ_DELEG:
5642	case NFS4_SHARE_WANT_WRITE_DELEG:
5643	case NFS4_SHARE_WANT_ANY_DELEG:
5644	break;
5645	case NFS4_SHARE_WANT_CANCEL:
5646	open->op_why_no_deleg = WND4_CANCELLED;
5647	break;
5648	case NFS4_SHARE_WANT_NO_DELEG:
5649	WARN_ON_ONCE(1);
5650	}
5651	}
5652	}
5653
5654	/*
5655	* The Linux NFS server does not offer write delegations to NFSv4.0
5656	* clients in order to avoid conflicts between write delegations and
5657	* GETATTRs requesting CHANGE or SIZE attributes.
5658	*
5659	* With NFSv4.1 and later minorversions, the SEQUENCE operation that
5660	* begins each COMPOUND contains a client ID. Delegation recall can
5661	* be avoided when the server recognizes the client sending a
5662	* GETATTR also holds write delegation it conflicts with.
5663	*
5664	* However, the NFSv4.0 protocol does not enable a server to
5665	* determine that a GETATTR originated from the client holding the
5666	* conflicting delegation versus coming from some other client. Per
5667	* RFC 7530 Section 16.7.5, the server must recall or send a
5668	* CB_GETATTR even when the GETATTR originates from the client that
5669	* holds the conflicting delegation.
5670	*
5671	* An NFSv4.0 client can trigger a pathological situation if it
5672	* always sends a DELEGRETURN preceded by a conflicting GETATTR in
5673	* the same COMPOUND. COMPOUND execution will always stop at the
5674	* GETATTR and the DELEGRETURN will never get executed. The server
5675	* eventually revokes the delegation, which can result in loss of
5676	* open or lock state.
5677	*/
5678	static void
5679	nfs4_open_delegation(struct nfsd4_open *open, struct nfs4_ol_stateid *stp,
5680	struct svc_fh *currentfh)
5681	{
5682	struct nfs4_delegation *dp;
5683	struct nfs4_openowner *oo = openowner(so: stp->st_stateowner);
5684	struct nfs4_client *clp = stp->st_stid.sc_client;
5685	struct svc_fh *parent = NULL;
5686	int cb_up;
5687	int status = 0;
5688	struct kstat stat;
5689	struct path path;
5690
5691	cb_up = nfsd4_cb_channel_good(clp: oo->oo_owner.so_client);
5692	open->op_recall = false;
5693	switch (open->op_claim_type) {
5694	case NFS4_OPEN_CLAIM_PREVIOUS:
5695	if (!cb_up)
5696	open->op_recall = true;
5697	break;
5698	case NFS4_OPEN_CLAIM_NULL:
5699	parent = currentfh;
5700	fallthrough;
5701	case NFS4_OPEN_CLAIM_FH:
5702	/*
5703	* Let's not give out any delegations till everyone's
5704	* had the chance to reclaim theirs, *and* until
5705	* NLM locks have all been reclaimed:
5706	*/
5707	if (locks_in_grace(clp->net))
5708	goto out_no_deleg;
5709	if (!cb_up || !(oo->oo_flags & NFS4_OO_CONFIRMED))
5710	goto out_no_deleg;
5711	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE &&
5712	!clp->cl_minorversion)
5713	goto out_no_deleg;
5714	break;
5715	default:
5716	goto out_no_deleg;
5717	}
5718	dp = nfs4_set_delegation(open, stp, parent);
5719	if (IS_ERR(ptr: dp))
5720	goto out_no_deleg;
5721
5722	memcpy(&open->op_delegate_stateid, &dp->dl_stid.sc_stateid, sizeof(dp->dl_stid.sc_stateid));
5723
5724	if (open->op_share_access & NFS4_SHARE_ACCESS_WRITE) {
5725	open->op_delegate_type = NFS4_OPEN_DELEGATE_WRITE;
5726	trace_nfsd_deleg_write(stp: &dp->dl_stid.sc_stateid);
5727	path.mnt = currentfh->fh_export->ex_path.mnt;
5728	path.dentry = currentfh->fh_dentry;
5729	if (vfs_getattr(&path, &stat,
5730	(STATX_SIZE | STATX_CTIME | STATX_CHANGE_COOKIE),
5731	AT_STATX_SYNC_AS_STAT)) {
5732	nfs4_put_stid(s: &dp->dl_stid);
5733	destroy_delegation(dp);
5734	goto out_no_deleg;
5735	}
5736	dp->dl_cb_fattr.ncf_cur_fsize = stat.size;
5737	dp->dl_cb_fattr.ncf_initial_cinfo =
5738	nfsd4_change_attribute(stat: &stat, inode: d_inode(dentry: currentfh->fh_dentry));
5739	} else {
5740	open->op_delegate_type = NFS4_OPEN_DELEGATE_READ;
5741	trace_nfsd_deleg_read(stp: &dp->dl_stid.sc_stateid);
5742	}
5743	nfs4_put_stid(s: &dp->dl_stid);
5744	return;
5745	out_no_deleg:
5746	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE;
5747	if (open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS &&
5748	open->op_delegate_type != NFS4_OPEN_DELEGATE_NONE) {
5749	dprintk("NFSD: WARNING: refusing delegation reclaim\n");
5750	open->op_recall = true;
5751	}
5752
5753	/* 4.1 client asking for a delegation? */
5754	if (open->op_deleg_want)
5755	nfsd4_open_deleg_none_ext(open, status);
5756	return;
5757	}
5758
5759	static void nfsd4_deleg_xgrade_none_ext(struct nfsd4_open *open,
5760	struct nfs4_delegation *dp)
5761	{
5762	if (open->op_deleg_want == NFS4_SHARE_WANT_READ_DELEG &&
5763	dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5764	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5765	open->op_why_no_deleg = WND4_NOT_SUPP_DOWNGRADE;
5766	} else if (open->op_deleg_want == NFS4_SHARE_WANT_WRITE_DELEG &&
5767	dp->dl_type == NFS4_OPEN_DELEGATE_WRITE) {
5768	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5769	open->op_why_no_deleg = WND4_NOT_SUPP_UPGRADE;
5770	}
5771	/* Otherwise the client must be confused wanting a delegation
5772	* it already has, therefore we don't return
5773	* NFS4_OPEN_DELEGATE_NONE_EXT and reason.
5774	*/
5775	}
5776
5777	/**
5778	* nfsd4_process_open2 - finish open processing
5779	* @rqstp: the RPC transaction being executed
5780	* @current_fh: NFSv4 COMPOUND's current filehandle
5781	* @open: OPEN arguments
5782	*
5783	* If successful, (1) truncate the file if open->op_truncate was
5784	* set, (2) set open->op_stateid, (3) set open->op_delegation.
5785	*
5786	* Returns %nfs_ok on success; otherwise an nfs4stat value in
5787	* network byte order is returned.
5788	*/
5789	__be32
5790	nfsd4_process_open2(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_open *open)
5791	{
5792	struct nfsd4_compoundres *resp = rqstp->rq_resp;
5793	struct nfs4_client *cl = open->op_openowner->oo_owner.so_client;
5794	struct nfs4_file *fp = NULL;
5795	struct nfs4_ol_stateid *stp = NULL;
5796	struct nfs4_delegation *dp = NULL;
5797	__be32 status;
5798	bool new_stp = false;
5799
5800	/*
5801	* Lookup file; if found, lookup stateid and check open request,
5802	* and check for delegations in the process of being recalled.
5803	* If not found, create the nfs4_file struct
5804	*/
5805	fp = nfsd4_file_hash_insert(new: open->op_file, fhp: current_fh);
5806	if (unlikely(!fp))
5807	return nfserr_jukebox;
5808	if (fp != open->op_file) {
5809	status = nfs4_check_deleg(cl, open, dp: &dp);
5810	if (status)
5811	goto out;
5812	stp = nfsd4_find_and_lock_existing_open(fp, open);
5813	} else {
5814	open->op_file = NULL;
5815	status = nfserr_bad_stateid;
5816	if (nfsd4_is_deleg_cur(open))
5817	goto out;
5818	}
5819
5820	if (!stp) {
5821	stp = init_open_stateid(fp, open);
5822	if (!open->op_stp)
5823	new_stp = true;
5824	}
5825
5826	/*
5827	* OPEN the file, or upgrade an existing OPEN.
5828	* If truncate fails, the OPEN fails.
5829	*
5830	* stp is already locked.
5831	*/
5832	if (!new_stp) {
5833	/* Stateid was found, this is an OPEN upgrade */
5834	status = nfs4_upgrade_open(rqstp, fp, cur_fh: current_fh, stp, open);
5835	if (status) {
5836	mutex_unlock(lock: &stp->st_mutex);
5837	goto out;
5838	}
5839	} else {
5840	status = nfs4_get_vfs_file(rqstp, fp, cur_fh: current_fh, stp, open, new_stp: true);
5841	if (status) {
5842	stp->st_stid.sc_type = NFS4_CLOSED_STID;
5843	release_open_stateid(stp);
5844	mutex_unlock(lock: &stp->st_mutex);
5845	goto out;
5846	}
5847
5848	stp->st_clnt_odstate = find_or_hash_clnt_odstate(fp,
5849	new: open->op_odstate);
5850	if (stp->st_clnt_odstate == open->op_odstate)
5851	open->op_odstate = NULL;
5852	}
5853
5854	nfs4_inc_and_copy_stateid(dst: &open->op_stateid, stid: &stp->st_stid);
5855	mutex_unlock(lock: &stp->st_mutex);
5856
5857	if (nfsd4_has_session(cs: &resp->cstate)) {
5858	if (open->op_deleg_want & NFS4_SHARE_WANT_NO_DELEG) {
5859	open->op_delegate_type = NFS4_OPEN_DELEGATE_NONE_EXT;
5860	open->op_why_no_deleg = WND4_NOT_WANTED;
5861	goto nodeleg;
5862	}
5863	}
5864
5865	/*
5866	* Attempt to hand out a delegation. No error return, because the
5867	* OPEN succeeds even if we fail.
5868	*/
5869	nfs4_open_delegation(open, stp, currentfh: &resp->cstate.current_fh);
5870	nodeleg:
5871	status = nfs_ok;
5872	trace_nfsd_open(stp: &stp->st_stid.sc_stateid);
5873	out:
5874	/* 4.1 client trying to upgrade/downgrade delegation? */
5875	if (open->op_delegate_type == NFS4_OPEN_DELEGATE_NONE && dp &&
5876	open->op_deleg_want)
5877	nfsd4_deleg_xgrade_none_ext(open, dp);
5878
5879	if (fp)
5880	put_nfs4_file(fi: fp);
5881	if (status == 0 && open->op_claim_type == NFS4_OPEN_CLAIM_PREVIOUS)
5882	open->op_openowner->oo_flags |= NFS4_OO_CONFIRMED;
5883	/*
5884	* To finish the open response, we just need to set the rflags.
5885	*/
5886	open->op_rflags = NFS4_OPEN_RESULT_LOCKTYPE_POSIX;
5887	if (nfsd4_has_session(cs: &resp->cstate))
5888	open->op_rflags |= NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK;
5889	else if (!(open->op_openowner->oo_flags & NFS4_OO_CONFIRMED))
5890	open->op_rflags |= NFS4_OPEN_RESULT_CONFIRM;
5891
5892	if (dp)
5893	nfs4_put_stid(s: &dp->dl_stid);
5894	if (stp)
5895	nfs4_put_stid(s: &stp->st_stid);
5896
5897	return status;
5898	}
5899
5900	void nfsd4_cleanup_open_state(struct nfsd4_compound_state *cstate,
5901	struct nfsd4_open *open)
5902	{
5903	if (open->op_openowner) {
5904	struct nfs4_stateowner *so = &open->op_openowner->oo_owner;
5905
5906	nfsd4_cstate_assign_replay(cstate, so);
5907	nfs4_put_stateowner(sop: so);
5908	}
5909	if (open->op_file)
5910	kmem_cache_free(s: file_slab, objp: open->op_file);
5911	if (open->op_stp)
5912	nfs4_put_stid(s: &open->op_stp->st_stid);
5913	if (open->op_odstate)
5914	kmem_cache_free(s: odstate_slab, objp: open->op_odstate);
5915	}
5916
5917	__be32
5918	nfsd4_renew(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
5919	union nfsd4_op_u *u)
5920	{
5921	clientid_t *clid = &u->renew;
5922	struct nfs4_client *clp;
5923	__be32 status;
5924	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
5925
5926	trace_nfsd_clid_renew(clid);
5927	status = set_client(clid, cstate, nn);
5928	if (status)
5929	return status;
5930	clp = cstate->clp;
5931	if (!list_empty(head: &clp->cl_delegations)
5932	&& clp->cl_cb_state != NFSD4_CB_UP)
5933	return nfserr_cb_path_down;
5934	return nfs_ok;
5935	}
5936
5937	void
5938	nfsd4_end_grace(struct nfsd_net *nn)
5939	{
5940	/* do nothing if grace period already ended */
5941	if (nn->grace_ended)
5942	return;
5943
5944	trace_nfsd_grace_complete(nn);
5945	nn->grace_ended = true;
5946	/*
5947	* If the server goes down again right now, an NFSv4
5948	* client will still be allowed to reclaim after it comes back up,
5949	* even if it hasn't yet had a chance to reclaim state this time.
5950	*
5951	*/
5952	nfsd4_record_grace_done(nn);
5953	/*
5954	* At this point, NFSv4 clients can still reclaim. But if the
5955	* server crashes, any that have not yet reclaimed will be out
5956	* of luck on the next boot.
5957	*
5958	* (NFSv4.1+ clients are considered to have reclaimed once they
5959	* call RECLAIM_COMPLETE. NFSv4.0 clients are considered to
5960	* have reclaimed after their first OPEN.)
5961	*/
5962	locks_end_grace(&nn->nfsd4_manager);
5963	/*
5964	* At this point, and once lockd and/or any other containers
5965	* exit their grace period, further reclaims will fail and
5966	* regular locking can resume.
5967	*/
5968	}
5969
5970	/*
5971	* If we've waited a lease period but there are still clients trying to
5972	* reclaim, wait a little longer to give them a chance to finish.
5973	*/
5974	static bool clients_still_reclaiming(struct nfsd_net *nn)
5975	{
5976	time64_t double_grace_period_end = nn->boot_time +
5977	2 * nn->nfsd4_lease;
5978
5979	if (nn->track_reclaim_completes &&
5980	atomic_read(v: &nn->nr_reclaim_complete) ==
5981	nn->reclaim_str_hashtbl_size)
5982	return false;
5983	if (!nn->somebody_reclaimed)
5984	return false;
5985	nn->somebody_reclaimed = false;
5986	/*
5987	* If we've given them *two* lease times to reclaim, and they're
5988	* still not done, give up:
5989	*/
5990	if (ktime_get_boottime_seconds() > double_grace_period_end)
5991	return false;
5992	return true;
5993	}
5994
5995	struct laundry_time {
5996	time64_t cutoff;
5997	time64_t new_timeo;
5998	};
5999
6000	static bool state_expired(struct laundry_time *lt, time64_t last_refresh)
6001	{
6002	time64_t time_remaining;
6003
6004	if (last_refresh < lt->cutoff)
6005	return true;
6006	time_remaining = last_refresh - lt->cutoff;
6007	lt->new_timeo = min(lt->new_timeo, time_remaining);
6008	return false;
6009	}
6010
6011	#ifdef CONFIG_NFSD_V4_2_INTER_SSC
6012	void nfsd4_ssc_init_umount_work(struct nfsd_net *nn)
6013	{
6014	spin_lock_init(&nn->nfsd_ssc_lock);
6015	INIT_LIST_HEAD(list: &nn->nfsd_ssc_mount_list);
6016	init_waitqueue_head(&nn->nfsd_ssc_waitq);
6017	}
6018	EXPORT_SYMBOL_GPL(nfsd4_ssc_init_umount_work);
6019
6020	/*
6021	* This is called when nfsd is being shutdown, after all inter_ssc
6022	* cleanup were done, to destroy the ssc delayed unmount list.
6023	*/
6024	static void nfsd4_ssc_shutdown_umount(struct nfsd_net *nn)
6025	{
6026	struct nfsd4_ssc_umount_item *ni = NULL;
6027	struct nfsd4_ssc_umount_item *tmp;
6028
6029	spin_lock(lock: &nn->nfsd_ssc_lock);
6030	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6031	list_del(entry: &ni->nsui_list);
6032	spin_unlock(lock: &nn->nfsd_ssc_lock);
6033	mntput(mnt: ni->nsui_vfsmount);
6034	kfree(objp: ni);
6035	spin_lock(lock: &nn->nfsd_ssc_lock);
6036	}
6037	spin_unlock(lock: &nn->nfsd_ssc_lock);
6038	}
6039
6040	static void nfsd4_ssc_expire_umount(struct nfsd_net *nn)
6041	{
6042	bool do_wakeup = false;
6043	struct nfsd4_ssc_umount_item *ni = NULL;
6044	struct nfsd4_ssc_umount_item *tmp;
6045
6046	spin_lock(lock: &nn->nfsd_ssc_lock);
6047	list_for_each_entry_safe(ni, tmp, &nn->nfsd_ssc_mount_list, nsui_list) {
6048	if (time_after(jiffies, ni->nsui_expire)) {
6049	if (refcount_read(r: &ni->nsui_refcnt) > 1)
6050	continue;
6051
6052	/* mark being unmount */
6053	ni->nsui_busy = true;
6054	spin_unlock(lock: &nn->nfsd_ssc_lock);
6055	mntput(mnt: ni->nsui_vfsmount);
6056	spin_lock(lock: &nn->nfsd_ssc_lock);
6057
6058	/* waiters need to start from begin of list */
6059	list_del(entry: &ni->nsui_list);
6060	kfree(objp: ni);
6061
6062	/* wakeup ssc_connect waiters */
6063	do_wakeup = true;
6064	continue;
6065	}
6066	break;
6067	}
6068	if (do_wakeup)
6069	wake_up_all(&nn->nfsd_ssc_waitq);
6070	spin_unlock(lock: &nn->nfsd_ssc_lock);
6071	}
6072	#endif
6073
6074	/* Check if any lock belonging to this lockowner has any blockers */
6075	static bool
6076	nfs4_lockowner_has_blockers(struct nfs4_lockowner *lo)
6077	{
6078	struct file_lock_context *ctx;
6079	struct nfs4_ol_stateid *stp;
6080	struct nfs4_file *nf;
6081
6082	list_for_each_entry(stp, &lo->lo_owner.so_stateids, st_perstateowner) {
6083	nf = stp->st_stid.sc_file;
6084	ctx = locks_inode_context(inode: nf->fi_inode);
6085	if (!ctx)
6086	continue;
6087	if (locks_owner_has_blockers(flctx: ctx, owner: lo))
6088	return true;
6089	}
6090	return false;
6091	}
6092
6093	static bool
6094	nfs4_anylock_blockers(struct nfs4_client *clp)
6095	{
6096	int i;
6097	struct nfs4_stateowner *so;
6098	struct nfs4_lockowner *lo;
6099
6100	if (atomic_read(v: &clp->cl_delegs_in_recall))
6101	return true;
6102	spin_lock(lock: &clp->cl_lock);
6103	for (i = 0; i < OWNER_HASH_SIZE; i++) {
6104	list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[i],
6105	so_strhash) {
6106	if (so->so_is_open_owner)
6107	continue;
6108	lo = lockowner(so);
6109	if (nfs4_lockowner_has_blockers(lo)) {
6110	spin_unlock(lock: &clp->cl_lock);
6111	return true;
6112	}
6113	}
6114	}
6115	spin_unlock(lock: &clp->cl_lock);
6116	return false;
6117	}
6118
6119	static void
6120	nfs4_get_client_reaplist(struct nfsd_net *nn, struct list_head *reaplist,
6121	struct laundry_time *lt)
6122	{
6123	unsigned int maxreap, reapcnt = 0;
6124	struct list_head *pos, *next;
6125	struct nfs4_client *clp;
6126
6127	maxreap = (atomic_read(v: &nn->nfs4_client_count) >= nn->nfs4_max_clients) ?
6128	NFSD_CLIENT_MAX_TRIM_PER_RUN : 0;
6129	INIT_LIST_HEAD(list: reaplist);
6130	spin_lock(lock: &nn->client_lock);
6131	list_for_each_safe(pos, next, &nn->client_lru) {
6132	clp = list_entry(pos, struct nfs4_client, cl_lru);
6133	if (clp->cl_state == NFSD4_EXPIRABLE)
6134	goto exp_client;
6135	if (!state_expired(lt, last_refresh: clp->cl_time))
6136	break;
6137	if (!atomic_read(v: &clp->cl_rpc_users)) {
6138	if (clp->cl_state == NFSD4_ACTIVE)
6139	atomic_inc(v: &nn->nfsd_courtesy_clients);
6140	clp->cl_state = NFSD4_COURTESY;
6141	}
6142	if (!client_has_state(clp))
6143	goto exp_client;
6144	if (!nfs4_anylock_blockers(clp))
6145	if (reapcnt >= maxreap)
6146	continue;
6147	exp_client:
6148	if (!mark_client_expired_locked(clp)) {
6149	list_add(new: &clp->cl_lru, head: reaplist);
6150	reapcnt++;
6151	}
6152	}
6153	spin_unlock(lock: &nn->client_lock);
6154	}
6155
6156	static void
6157	nfs4_get_courtesy_client_reaplist(struct nfsd_net *nn,
6158	struct list_head *reaplist)
6159	{
6160	unsigned int maxreap = 0, reapcnt = 0;
6161	struct list_head *pos, *next;
6162	struct nfs4_client *clp;
6163
6164	maxreap = NFSD_CLIENT_MAX_TRIM_PER_RUN;
6165	INIT_LIST_HEAD(list: reaplist);
6166
6167	spin_lock(lock: &nn->client_lock);
6168	list_for_each_safe(pos, next, &nn->client_lru) {
6169	clp = list_entry(pos, struct nfs4_client, cl_lru);
6170	if (clp->cl_state == NFSD4_ACTIVE)
6171	break;
6172	if (reapcnt >= maxreap)
6173	break;
6174	if (!mark_client_expired_locked(clp)) {
6175	list_add(new: &clp->cl_lru, head: reaplist);
6176	reapcnt++;
6177	}
6178	}
6179	spin_unlock(lock: &nn->client_lock);
6180	}
6181
6182	static void
6183	nfs4_process_client_reaplist(struct list_head *reaplist)
6184	{
6185	struct list_head *pos, *next;
6186	struct nfs4_client *clp;
6187
6188	list_for_each_safe(pos, next, reaplist) {
6189	clp = list_entry(pos, struct nfs4_client, cl_lru);
6190	trace_nfsd_clid_purged(clid: &clp->cl_clientid);
6191	list_del_init(entry: &clp->cl_lru);
6192	expire_client(clp);
6193	}
6194	}
6195
6196	static time64_t
6197	nfs4_laundromat(struct nfsd_net *nn)
6198	{
6199	struct nfs4_openowner *oo;
6200	struct nfs4_delegation *dp;
6201	struct nfs4_ol_stateid *stp;
6202	struct nfsd4_blocked_lock *nbl;
6203	struct list_head *pos, *next, reaplist;
6204	struct laundry_time lt = {
6205	.cutoff = ktime_get_boottime_seconds() - nn->nfsd4_lease,
6206	.new_timeo = nn->nfsd4_lease
6207	};
6208	struct nfs4_cpntf_state *cps;
6209	copy_stateid_t *cps_t;
6210	int i;
6211
6212	if (clients_still_reclaiming(nn)) {
6213	lt.new_timeo = 0;
6214	goto out;
6215	}
6216	nfsd4_end_grace(nn);
6217
6218	spin_lock(lock: &nn->s2s_cp_lock);
6219	idr_for_each_entry(&nn->s2s_cp_stateids, cps_t, i) {
6220	cps = container_of(cps_t, struct nfs4_cpntf_state, cp_stateid);
6221	if (cps->cp_stateid.cs_type == NFS4_COPYNOTIFY_STID &&
6222	state_expired(lt: &lt, last_refresh: cps->cpntf_time))
6223	_free_cpntf_state_locked(nn, cps);
6224	}
6225	spin_unlock(lock: &nn->s2s_cp_lock);
6226	nfs4_get_client_reaplist(nn, reaplist: &reaplist, lt: &lt);
6227	nfs4_process_client_reaplist(reaplist: &reaplist);
6228
6229	spin_lock(lock: &state_lock);
6230	list_for_each_safe(pos, next, &nn->del_recall_lru) {
6231	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
6232	if (!state_expired(lt: &lt, last_refresh: dp->dl_time))
6233	break;
6234	WARN_ON(!unhash_delegation_locked(dp));
6235	list_add(new: &dp->dl_recall_lru, head: &reaplist);
6236	}
6237	spin_unlock(lock: &state_lock);
6238	while (!list_empty(head: &reaplist)) {
6239	dp = list_first_entry(&reaplist, struct nfs4_delegation,
6240	dl_recall_lru);
6241	list_del_init(entry: &dp->dl_recall_lru);
6242	revoke_delegation(dp);
6243	}
6244
6245	spin_lock(lock: &nn->client_lock);
6246	while (!list_empty(head: &nn->close_lru)) {
6247	oo = list_first_entry(&nn->close_lru, struct nfs4_openowner,
6248	oo_close_lru);
6249	if (!state_expired(lt: &lt, last_refresh: oo->oo_time))
6250	break;
6251	list_del_init(entry: &oo->oo_close_lru);
6252	stp = oo->oo_last_closed_stid;
6253	oo->oo_last_closed_stid = NULL;
6254	spin_unlock(lock: &nn->client_lock);
6255	nfs4_put_stid(s: &stp->st_stid);
6256	spin_lock(lock: &nn->client_lock);
6257	}
6258	spin_unlock(lock: &nn->client_lock);
6259
6260	/*
6261	* It's possible for a client to try and acquire an already held lock
6262	* that is being held for a long time, and then lose interest in it.
6263	* So, we clean out any un-revisited request after a lease period
6264	* under the assumption that the client is no longer interested.
6265	*
6266	* RFC5661, sec. 9.6 states that the client must not rely on getting
6267	* notifications and must continue to poll for locks, even when the
6268	* server supports them. Thus this shouldn't lead to clients blocking
6269	* indefinitely once the lock does become free.
6270	*/
6271	BUG_ON(!list_empty(&reaplist));
6272	spin_lock(lock: &nn->blocked_locks_lock);
6273	while (!list_empty(head: &nn->blocked_locks_lru)) {
6274	nbl = list_first_entry(&nn->blocked_locks_lru,
6275	struct nfsd4_blocked_lock, nbl_lru);
6276	if (!state_expired(lt: &lt, last_refresh: nbl->nbl_time))
6277	break;
6278	list_move(list: &nbl->nbl_lru, head: &reaplist);
6279	list_del_init(entry: &nbl->nbl_list);
6280	}
6281	spin_unlock(lock: &nn->blocked_locks_lock);
6282
6283	while (!list_empty(head: &reaplist)) {
6284	nbl = list_first_entry(&reaplist,
6285	struct nfsd4_blocked_lock, nbl_lru);
6286	list_del_init(entry: &nbl->nbl_lru);
6287	free_blocked_lock(nbl);
6288	}
6289	#ifdef CONFIG_NFSD_V4_2_INTER_SSC
6290	/* service the server-to-server copy delayed unmount list */
6291	nfsd4_ssc_expire_umount(nn);
6292	#endif
6293	out:
6294	return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
6295	}
6296
6297	static void laundromat_main(struct work_struct *);
6298
6299	static void
6300	laundromat_main(struct work_struct *laundry)
6301	{
6302	time64_t t;
6303	struct delayed_work *dwork = to_delayed_work(work: laundry);
6304	struct nfsd_net *nn = container_of(dwork, struct nfsd_net,
6305	laundromat_work);
6306
6307	t = nfs4_laundromat(nn);
6308	queue_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: t*HZ);
6309	}
6310
6311	static void
6312	courtesy_client_reaper(struct nfsd_net *nn)
6313	{
6314	struct list_head reaplist;
6315
6316	nfs4_get_courtesy_client_reaplist(nn, reaplist: &reaplist);
6317	nfs4_process_client_reaplist(reaplist: &reaplist);
6318	}
6319
6320	static void
6321	deleg_reaper(struct nfsd_net *nn)
6322	{
6323	struct list_head *pos, *next;
6324	struct nfs4_client *clp;
6325	struct list_head cblist;
6326
6327	INIT_LIST_HEAD(list: &cblist);
6328	spin_lock(lock: &nn->client_lock);
6329	list_for_each_safe(pos, next, &nn->client_lru) {
6330	clp = list_entry(pos, struct nfs4_client, cl_lru);
6331	if (clp->cl_state != NFSD4_ACTIVE ||
6332	list_empty(head: &clp->cl_delegations) ||
6333	atomic_read(v: &clp->cl_delegs_in_recall) ||
6334	test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) ||
6335	(ktime_get_boottime_seconds() -
6336	clp->cl_ra_time < 5)) {
6337	continue;
6338	}
6339	list_add(new: &clp->cl_ra_cblist, head: &cblist);
6340
6341	/* release in nfsd4_cb_recall_any_release */
6342	atomic_inc(v: &clp->cl_rpc_users);
6343	set_bit(NFSD4_CLIENT_CB_RECALL_ANY, addr: &clp->cl_flags);
6344	clp->cl_ra_time = ktime_get_boottime_seconds();
6345	}
6346	spin_unlock(lock: &nn->client_lock);
6347
6348	while (!list_empty(head: &cblist)) {
6349	clp = list_first_entry(&cblist, struct nfs4_client,
6350	cl_ra_cblist);
6351	list_del_init(entry: &clp->cl_ra_cblist);
6352	clp->cl_ra->ra_keep = 0;
6353	clp->cl_ra->ra_bmval[0] = BIT(RCA4_TYPE_MASK_RDATA_DLG);
6354	trace_nfsd_cb_recall_any(ra: clp->cl_ra);
6355	nfsd4_run_cb(cb: &clp->cl_ra->ra_cb);
6356	}
6357	}
6358
6359	static void
6360	nfsd4_state_shrinker_worker(struct work_struct *work)
6361	{
6362	struct nfsd_net *nn = container_of(work, struct nfsd_net,
6363	nfsd_shrinker_work);
6364
6365	courtesy_client_reaper(nn);
6366	deleg_reaper(nn);
6367	}
6368
6369	static inline __be32 nfs4_check_fh(struct svc_fh *fhp, struct nfs4_stid *stp)
6370	{
6371	if (!fh_match(fh1: &fhp->fh_handle, fh2: &stp->sc_file->fi_fhandle))
6372	return nfserr_bad_stateid;
6373	return nfs_ok;
6374	}
6375
6376	static
6377	__be32 nfs4_check_openmode(struct nfs4_ol_stateid *stp, int flags)
6378	{
6379	__be32 status = nfserr_openmode;
6380
6381	/* For lock stateid's, we test the parent open, not the lock: */
6382	if (stp->st_openstp)
6383	stp = stp->st_openstp;
6384	if ((flags & WR_STATE) && !access_permit_write(stp))
6385	goto out;
6386	if ((flags & RD_STATE) && !access_permit_read(stp))
6387	goto out;
6388	status = nfs_ok;
6389	out:
6390	return status;
6391	}
6392
6393	static inline __be32
6394	check_special_stateids(struct net *net, svc_fh *current_fh, stateid_t *stateid, int flags)
6395	{
6396	if (ONE_STATEID(stateid) && (flags & RD_STATE))
6397	return nfs_ok;
6398	else if (opens_in_grace(net)) {
6399	/* Answer in remaining cases depends on existence of
6400	* conflicting state; so we must wait out the grace period. */
6401	return nfserr_grace;
6402	} else if (flags & WR_STATE)
6403	return nfs4_share_conflict(current_fh,
6404	NFS4_SHARE_DENY_WRITE);
6405	else /* (flags & RD_STATE) && ZERO_STATEID(stateid) */
6406	return nfs4_share_conflict(current_fh,
6407	NFS4_SHARE_DENY_READ);
6408	}
6409
6410	static __be32 check_stateid_generation(stateid_t *in, stateid_t *ref, bool has_session)
6411	{
6412	/*
6413	* When sessions are used the stateid generation number is ignored
6414	* when it is zero.
6415	*/
6416	if (has_session && in->si_generation == 0)
6417	return nfs_ok;
6418
6419	if (in->si_generation == ref->si_generation)
6420	return nfs_ok;
6421
6422	/* If the client sends us a stateid from the future, it's buggy: */
6423	if (nfsd4_stateid_generation_after(a: in, b: ref))
6424	return nfserr_bad_stateid;
6425	/*
6426	* However, we could see a stateid from the past, even from a
6427	* non-buggy client. For example, if the client sends a lock
6428	* while some IO is outstanding, the lock may bump si_generation
6429	* while the IO is still in flight. The client could avoid that
6430	* situation by waiting for responses on all the IO requests,
6431	* but better performance may result in retrying IO that
6432	* receives an old_stateid error if requests are rarely
6433	* reordered in flight:
6434	*/
6435	return nfserr_old_stateid;
6436	}
6437
6438	static __be32 nfsd4_stid_check_stateid_generation(stateid_t *in, struct nfs4_stid *s, bool has_session)
6439	{
6440	__be32 ret;
6441
6442	spin_lock(lock: &s->sc_lock);
6443	ret = nfsd4_verify_open_stid(s);
6444	if (ret == nfs_ok)
6445	ret = check_stateid_generation(in, ref: &s->sc_stateid, has_session);
6446	spin_unlock(lock: &s->sc_lock);
6447	return ret;
6448	}
6449
6450	static __be32 nfsd4_check_openowner_confirmed(struct nfs4_ol_stateid *ols)
6451	{
6452	if (ols->st_stateowner->so_is_open_owner &&
6453	!(openowner(so: ols->st_stateowner)->oo_flags & NFS4_OO_CONFIRMED))
6454	return nfserr_bad_stateid;
6455	return nfs_ok;
6456	}
6457
6458	static __be32 nfsd4_validate_stateid(struct nfs4_client *cl, stateid_t *stateid)
6459	{
6460	struct nfs4_stid *s;
6461	__be32 status = nfserr_bad_stateid;
6462
6463	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6464	CLOSE_STATEID(stateid))
6465	return status;
6466	spin_lock(lock: &cl->cl_lock);
6467	s = find_stateid_locked(cl, t: stateid);
6468	if (!s)
6469	goto out_unlock;
6470	status = nfsd4_stid_check_stateid_generation(in: stateid, s, has_session: 1);
6471	if (status)
6472	goto out_unlock;
6473	switch (s->sc_type) {
6474	case NFS4_DELEG_STID:
6475	status = nfs_ok;
6476	break;
6477	case NFS4_REVOKED_DELEG_STID:
6478	status = nfserr_deleg_revoked;
6479	break;
6480	case NFS4_OPEN_STID:
6481	case NFS4_LOCK_STID:
6482	status = nfsd4_check_openowner_confirmed(ols: openlockstateid(s));
6483	break;
6484	default:
6485	printk("unknown stateid type %x\n", s->sc_type);
6486	fallthrough;
6487	case NFS4_CLOSED_STID:
6488	case NFS4_CLOSED_DELEG_STID:
6489	status = nfserr_bad_stateid;
6490	}
6491	out_unlock:
6492	spin_unlock(lock: &cl->cl_lock);
6493	return status;
6494	}
6495
6496	__be32
6497	nfsd4_lookup_stateid(struct nfsd4_compound_state *cstate,
6498	stateid_t *stateid, unsigned char typemask,
6499	struct nfs4_stid **s, struct nfsd_net *nn)
6500	{
6501	__be32 status;
6502	struct nfs4_stid *stid;
6503	bool return_revoked = false;
6504
6505	/*
6506	* only return revoked delegations if explicitly asked.
6507	* otherwise we report revoked or bad_stateid status.
6508	*/
6509	if (typemask & NFS4_REVOKED_DELEG_STID)
6510	return_revoked = true;
6511	else if (typemask & NFS4_DELEG_STID)
6512	typemask |= NFS4_REVOKED_DELEG_STID;
6513
6514	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid) ||
6515	CLOSE_STATEID(stateid))
6516	return nfserr_bad_stateid;
6517	status = set_client(clid: &stateid->si_opaque.so_clid, cstate, nn);
6518	if (status == nfserr_stale_clientid) {
6519	if (cstate->session)
6520	return nfserr_bad_stateid;
6521	return nfserr_stale_stateid;
6522	}
6523	if (status)
6524	return status;
6525	stid = find_stateid_by_type(cl: cstate->clp, t: stateid, typemask);
6526	if (!stid)
6527	return nfserr_bad_stateid;
6528	if ((stid->sc_type == NFS4_REVOKED_DELEG_STID) && !return_revoked) {
6529	nfs4_put_stid(s: stid);
6530	if (cstate->minorversion)
6531	return nfserr_deleg_revoked;
6532	return nfserr_bad_stateid;
6533	}
6534	*s = stid;
6535	return nfs_ok;
6536	}
6537
6538	static struct nfsd_file *
6539	nfs4_find_file(struct nfs4_stid *s, int flags)
6540	{
6541	struct nfsd_file *ret = NULL;
6542
6543	if (!s)
6544	return NULL;
6545
6546	switch (s->sc_type) {
6547	case NFS4_DELEG_STID:
6548	spin_lock(lock: &s->sc_file->fi_lock);
6549	ret = nfsd_file_get(nf: s->sc_file->fi_deleg_file);
6550	spin_unlock(lock: &s->sc_file->fi_lock);
6551	break;
6552	case NFS4_OPEN_STID:
6553	case NFS4_LOCK_STID:
6554	if (flags & RD_STATE)
6555	ret = find_readable_file(f: s->sc_file);
6556	else
6557	ret = find_writeable_file(f: s->sc_file);
6558	}
6559
6560	return ret;
6561	}
6562
6563	static __be32
6564	nfs4_check_olstateid(struct nfs4_ol_stateid *ols, int flags)
6565	{
6566	__be32 status;
6567
6568	status = nfsd4_check_openowner_confirmed(ols);
6569	if (status)
6570	return status;
6571	return nfs4_check_openmode(stp: ols, flags);
6572	}
6573
6574	static __be32
6575	nfs4_check_file(struct svc_rqst *rqstp, struct svc_fh *fhp, struct nfs4_stid *s,
6576	struct nfsd_file **nfp, int flags)
6577	{
6578	int acc = (flags & RD_STATE) ? NFSD_MAY_READ : NFSD_MAY_WRITE;
6579	struct nfsd_file *nf;
6580	__be32 status;
6581
6582	nf = nfs4_find_file(s, flags);
6583	if (nf) {
6584	status = nfsd_permission(rqstp, fhp->fh_export, fhp->fh_dentry,
6585	acc | NFSD_MAY_OWNER_OVERRIDE);
6586	if (status) {
6587	nfsd_file_put(nf);
6588	goto out;
6589	}
6590	} else {
6591	status = nfsd_file_acquire(rqstp, fhp, may_flags: acc, nfp: &nf);
6592	if (status)
6593	return status;
6594	}
6595	*nfp = nf;
6596	out:
6597	return status;
6598	}
6599	static void
6600	_free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6601	{
6602	WARN_ON_ONCE(cps->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID);
6603	if (!refcount_dec_and_test(r: &cps->cp_stateid.cs_count))
6604	return;
6605	list_del(entry: &cps->cp_list);
6606	idr_remove(&nn->s2s_cp_stateids,
6607	id: cps->cp_stateid.cs_stid.si_opaque.so_id);
6608	kfree(objp: cps);
6609	}
6610	/*
6611	* A READ from an inter server to server COPY will have a
6612	* copy stateid. Look up the copy notify stateid from the
6613	* idr structure and take a reference on it.
6614	*/
6615	__be32 manage_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6616	struct nfs4_client *clp,
6617	struct nfs4_cpntf_state **cps)
6618	{
6619	copy_stateid_t *cps_t;
6620	struct nfs4_cpntf_state *state = NULL;
6621
6622	if (st->si_opaque.so_clid.cl_id != nn->s2s_cp_cl_id)
6623	return nfserr_bad_stateid;
6624	spin_lock(lock: &nn->s2s_cp_lock);
6625	cps_t = idr_find(&nn->s2s_cp_stateids, id: st->si_opaque.so_id);
6626	if (cps_t) {
6627	state = container_of(cps_t, struct nfs4_cpntf_state,
6628	cp_stateid);
6629	if (state->cp_stateid.cs_type != NFS4_COPYNOTIFY_STID) {
6630	state = NULL;
6631	goto unlock;
6632	}
6633	if (!clp)
6634	refcount_inc(r: &state->cp_stateid.cs_count);
6635	else
6636	_free_cpntf_state_locked(nn, cps: state);
6637	}
6638	unlock:
6639	spin_unlock(lock: &nn->s2s_cp_lock);
6640	if (!state)
6641	return nfserr_bad_stateid;
6642	if (!clp && state)
6643	*cps = state;
6644	return 0;
6645	}
6646
6647	static __be32 find_cpntf_state(struct nfsd_net *nn, stateid_t *st,
6648	struct nfs4_stid **stid)
6649	{
6650	__be32 status;
6651	struct nfs4_cpntf_state *cps = NULL;
6652	struct nfs4_client *found;
6653
6654	status = manage_cpntf_state(nn, st, NULL, cps: &cps);
6655	if (status)
6656	return status;
6657
6658	cps->cpntf_time = ktime_get_boottime_seconds();
6659
6660	status = nfserr_expired;
6661	found = lookup_clientid(clid: &cps->cp_p_clid, sessions: true, nn);
6662	if (!found)
6663	goto out;
6664
6665	*stid = find_stateid_by_type(cl: found, t: &cps->cp_p_stateid,
6666	NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID);
6667	if (*stid)
6668	status = nfs_ok;
6669	else
6670	status = nfserr_bad_stateid;
6671
6672	put_client_renew(clp: found);
6673	out:
6674	nfs4_put_cpntf_state(nn, cps);
6675	return status;
6676	}
6677
6678	void nfs4_put_cpntf_state(struct nfsd_net *nn, struct nfs4_cpntf_state *cps)
6679	{
6680	spin_lock(lock: &nn->s2s_cp_lock);
6681	_free_cpntf_state_locked(nn, cps);
6682	spin_unlock(lock: &nn->s2s_cp_lock);
6683	}
6684
6685	/**
6686	* nfs4_preprocess_stateid_op - find and prep stateid for an operation
6687	* @rqstp: incoming request from client
6688	* @cstate: current compound state
6689	* @fhp: filehandle associated with requested stateid
6690	* @stateid: stateid (provided by client)
6691	* @flags: flags describing type of operation to be done
6692	* @nfp: optional nfsd_file return pointer (may be NULL)
6693	* @cstid: optional returned nfs4_stid pointer (may be NULL)
6694	*
6695	* Given info from the client, look up a nfs4_stid for the operation. On
6696	* success, it returns a reference to the nfs4_stid and/or the nfsd_file
6697	* associated with it.
6698	*/
6699	__be32
6700	nfs4_preprocess_stateid_op(struct svc_rqst *rqstp,
6701	struct nfsd4_compound_state *cstate, struct svc_fh *fhp,
6702	stateid_t *stateid, int flags, struct nfsd_file **nfp,
6703	struct nfs4_stid **cstid)
6704	{
6705	struct net *net = SVC_NET(rqstp);
6706	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
6707	struct nfs4_stid *s = NULL;
6708	__be32 status;
6709
6710	if (nfp)
6711	*nfp = NULL;
6712
6713	if (ZERO_STATEID(stateid) || ONE_STATEID(stateid)) {
6714	if (cstid)
6715	status = nfserr_bad_stateid;
6716	else
6717	status = check_special_stateids(net, current_fh: fhp, stateid,
6718	flags);
6719	goto done;
6720	}
6721
6722	status = nfsd4_lookup_stateid(cstate, stateid,
6723	NFS4_DELEG_STID|NFS4_OPEN_STID|NFS4_LOCK_STID,
6724	s: &s, nn);
6725	if (status == nfserr_bad_stateid)
6726	status = find_cpntf_state(nn, st: stateid, stid: &s);
6727	if (status)
6728	return status;
6729	status = nfsd4_stid_check_stateid_generation(in: stateid, s,
6730	has_session: nfsd4_has_session(cs: cstate));
6731	if (status)
6732	goto out;
6733
6734	switch (s->sc_type) {
6735	case NFS4_DELEG_STID:
6736	status = nfs4_check_delegmode(dp: delegstateid(s), flags);
6737	break;
6738	case NFS4_OPEN_STID:
6739	case NFS4_LOCK_STID:
6740	status = nfs4_check_olstateid(ols: openlockstateid(s), flags);
6741	break;
6742	default:
6743	status = nfserr_bad_stateid;
6744	break;
6745	}
6746	if (status)
6747	goto out;
6748	status = nfs4_check_fh(fhp, stp: s);
6749
6750	done:
6751	if (status == nfs_ok && nfp)
6752	status = nfs4_check_file(rqstp, fhp, s, nfp, flags);
6753	out:
6754	if (s) {
6755	if (!status && cstid)
6756	*cstid = s;
6757	else
6758	nfs4_put_stid(s);
6759	}
6760	return status;
6761	}
6762
6763	/*
6764	* Test if the stateid is valid
6765	*/
6766	__be32
6767	nfsd4_test_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6768	union nfsd4_op_u *u)
6769	{
6770	struct nfsd4_test_stateid *test_stateid = &u->test_stateid;
6771	struct nfsd4_test_stateid_id *stateid;
6772	struct nfs4_client *cl = cstate->clp;
6773
6774	list_for_each_entry(stateid, &test_stateid->ts_stateid_list, ts_id_list)
6775	stateid->ts_id_status =
6776	nfsd4_validate_stateid(cl, stateid: &stateid->ts_id_stateid);
6777
6778	return nfs_ok;
6779	}
6780
6781	static __be32
6782	nfsd4_free_lock_stateid(stateid_t *stateid, struct nfs4_stid *s)
6783	{
6784	struct nfs4_ol_stateid *stp = openlockstateid(s);
6785	__be32 ret;
6786
6787	ret = nfsd4_lock_ol_stateid(stp);
6788	if (ret)
6789	goto out_put_stid;
6790
6791	ret = check_stateid_generation(in: stateid, ref: &s->sc_stateid, has_session: 1);
6792	if (ret)
6793	goto out;
6794
6795	ret = nfserr_locks_held;
6796	if (check_for_locks(fp: stp->st_stid.sc_file,
6797	lowner: lockowner(so: stp->st_stateowner)))
6798	goto out;
6799
6800	release_lock_stateid(stp);
6801	ret = nfs_ok;
6802
6803	out:
6804	mutex_unlock(lock: &stp->st_mutex);
6805	out_put_stid:
6806	nfs4_put_stid(s);
6807	return ret;
6808	}
6809
6810	__be32
6811	nfsd4_free_stateid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6812	union nfsd4_op_u *u)
6813	{
6814	struct nfsd4_free_stateid *free_stateid = &u->free_stateid;
6815	stateid_t *stateid = &free_stateid->fr_stateid;
6816	struct nfs4_stid *s;
6817	struct nfs4_delegation *dp;
6818	struct nfs4_client *cl = cstate->clp;
6819	__be32 ret = nfserr_bad_stateid;
6820
6821	spin_lock(lock: &cl->cl_lock);
6822	s = find_stateid_locked(cl, t: stateid);
6823	if (!s)
6824	goto out_unlock;
6825	spin_lock(lock: &s->sc_lock);
6826	switch (s->sc_type) {
6827	case NFS4_DELEG_STID:
6828	ret = nfserr_locks_held;
6829	break;
6830	case NFS4_OPEN_STID:
6831	ret = check_stateid_generation(in: stateid, ref: &s->sc_stateid, has_session: 1);
6832	if (ret)
6833	break;
6834	ret = nfserr_locks_held;
6835	break;
6836	case NFS4_LOCK_STID:
6837	spin_unlock(lock: &s->sc_lock);
6838	refcount_inc(r: &s->sc_count);
6839	spin_unlock(lock: &cl->cl_lock);
6840	ret = nfsd4_free_lock_stateid(stateid, s);
6841	goto out;
6842	case NFS4_REVOKED_DELEG_STID:
6843	spin_unlock(lock: &s->sc_lock);
6844	dp = delegstateid(s);
6845	list_del_init(entry: &dp->dl_recall_lru);
6846	spin_unlock(lock: &cl->cl_lock);
6847	nfs4_put_stid(s);
6848	ret = nfs_ok;
6849	goto out;
6850	/* Default falls through and returns nfserr_bad_stateid */
6851	}
6852	spin_unlock(lock: &s->sc_lock);
6853	out_unlock:
6854	spin_unlock(lock: &cl->cl_lock);
6855	out:
6856	return ret;
6857	}
6858
6859	static inline int
6860	setlkflg (int type)
6861	{
6862	return (type == NFS4_READW_LT || type == NFS4_READ_LT) ?
6863	RD_STATE : WR_STATE;
6864	}
6865
6866	static __be32 nfs4_seqid_op_checks(struct nfsd4_compound_state *cstate, stateid_t *stateid, u32 seqid, struct nfs4_ol_stateid *stp)
6867	{
6868	struct svc_fh *current_fh = &cstate->current_fh;
6869	struct nfs4_stateowner *sop = stp->st_stateowner;
6870	__be32 status;
6871
6872	status = nfsd4_check_seqid(cstate, so: sop, seqid);
6873	if (status)
6874	return status;
6875	status = nfsd4_lock_ol_stateid(stp);
6876	if (status != nfs_ok)
6877	return status;
6878	status = check_stateid_generation(in: stateid, ref: &stp->st_stid.sc_stateid, has_session: nfsd4_has_session(cs: cstate));
6879	if (status == nfs_ok)
6880	status = nfs4_check_fh(fhp: current_fh, stp: &stp->st_stid);
6881	if (status != nfs_ok)
6882	mutex_unlock(lock: &stp->st_mutex);
6883	return status;
6884	}
6885
6886	/**
6887	* nfs4_preprocess_seqid_op - find and prep an ol_stateid for a seqid-morphing op
6888	* @cstate: compund state
6889	* @seqid: seqid (provided by client)
6890	* @stateid: stateid (provided by client)
6891	* @typemask: mask of allowable types for this operation
6892	* @stpp: return pointer for the stateid found
6893	* @nn: net namespace for request
6894	*
6895	* Given a stateid+seqid from a client, look up an nfs4_ol_stateid and
6896	* return it in @stpp. On a nfs_ok return, the returned stateid will
6897	* have its st_mutex locked.
6898	*/
6899	static __be32
6900	nfs4_preprocess_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6901	stateid_t *stateid, char typemask,
6902	struct nfs4_ol_stateid **stpp,
6903	struct nfsd_net *nn)
6904	{
6905	__be32 status;
6906	struct nfs4_stid *s;
6907	struct nfs4_ol_stateid *stp = NULL;
6908
6909	trace_nfsd_preprocess(seqid, stp: stateid);
6910
6911	*stpp = NULL;
6912	status = nfsd4_lookup_stateid(cstate, stateid, typemask, s: &s, nn);
6913	if (status)
6914	return status;
6915	stp = openlockstateid(s);
6916	nfsd4_cstate_assign_replay(cstate, so: stp->st_stateowner);
6917
6918	status = nfs4_seqid_op_checks(cstate, stateid, seqid, stp);
6919	if (!status)
6920	*stpp = stp;
6921	else
6922	nfs4_put_stid(s: &stp->st_stid);
6923	return status;
6924	}
6925
6926	static __be32 nfs4_preprocess_confirmed_seqid_op(struct nfsd4_compound_state *cstate, u32 seqid,
6927	stateid_t *stateid, struct nfs4_ol_stateid **stpp, struct nfsd_net *nn)
6928	{
6929	__be32 status;
6930	struct nfs4_openowner *oo;
6931	struct nfs4_ol_stateid *stp;
6932
6933	status = nfs4_preprocess_seqid_op(cstate, seqid, stateid,
6934	NFS4_OPEN_STID, stpp: &stp, nn);
6935	if (status)
6936	return status;
6937	oo = openowner(so: stp->st_stateowner);
6938	if (!(oo->oo_flags & NFS4_OO_CONFIRMED)) {
6939	mutex_unlock(lock: &stp->st_mutex);
6940	nfs4_put_stid(s: &stp->st_stid);
6941	return nfserr_bad_stateid;
6942	}
6943	*stpp = stp;
6944	return nfs_ok;
6945	}
6946
6947	__be32
6948	nfsd4_open_confirm(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
6949	union nfsd4_op_u *u)
6950	{
6951	struct nfsd4_open_confirm *oc = &u->open_confirm;
6952	__be32 status;
6953	struct nfs4_openowner *oo;
6954	struct nfs4_ol_stateid *stp;
6955	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
6956
6957	dprintk("NFSD: nfsd4_open_confirm on file %pd\n",
6958	cstate->current_fh.fh_dentry);
6959
6960	status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0);
6961	if (status)
6962	return status;
6963
6964	status = nfs4_preprocess_seqid_op(cstate,
6965	seqid: oc->oc_seqid, stateid: &oc->oc_req_stateid,
6966	NFS4_OPEN_STID, stpp: &stp, nn);
6967	if (status)
6968	goto out;
6969	oo = openowner(so: stp->st_stateowner);
6970	status = nfserr_bad_stateid;
6971	if (oo->oo_flags & NFS4_OO_CONFIRMED) {
6972	mutex_unlock(lock: &stp->st_mutex);
6973	goto put_stateid;
6974	}
6975	oo->oo_flags |= NFS4_OO_CONFIRMED;
6976	nfs4_inc_and_copy_stateid(dst: &oc->oc_resp_stateid, stid: &stp->st_stid);
6977	mutex_unlock(lock: &stp->st_mutex);
6978	trace_nfsd_open_confirm(seqid: oc->oc_seqid, stp: &stp->st_stid.sc_stateid);
6979	nfsd4_client_record_create(clp: oo->oo_owner.so_client);
6980	status = nfs_ok;
6981	put_stateid:
6982	nfs4_put_stid(s: &stp->st_stid);
6983	out:
6984	nfsd4_bump_seqid(cstate, nfserr: status);
6985	return status;
6986	}
6987
6988	static inline void nfs4_stateid_downgrade_bit(struct nfs4_ol_stateid *stp, u32 access)
6989	{
6990	if (!test_access(access, stp))
6991	return;
6992	nfs4_file_put_access(fp: stp->st_stid.sc_file, access);
6993	clear_access(access, stp);
6994	}
6995
6996	static inline void nfs4_stateid_downgrade(struct nfs4_ol_stateid *stp, u32 to_access)
6997	{
6998	switch (to_access) {
6999	case NFS4_SHARE_ACCESS_READ:
7000	nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_WRITE);
7001	nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7002	break;
7003	case NFS4_SHARE_ACCESS_WRITE:
7004	nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_READ);
7005	nfs4_stateid_downgrade_bit(stp, NFS4_SHARE_ACCESS_BOTH);
7006	break;
7007	case NFS4_SHARE_ACCESS_BOTH:
7008	break;
7009	default:
7010	WARN_ON_ONCE(1);
7011	}
7012	}
7013
7014	__be32
7015	nfsd4_open_downgrade(struct svc_rqst *rqstp,
7016	struct nfsd4_compound_state *cstate, union nfsd4_op_u *u)
7017	{
7018	struct nfsd4_open_downgrade *od = &u->open_downgrade;
7019	__be32 status;
7020	struct nfs4_ol_stateid *stp;
7021	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
7022
7023	dprintk("NFSD: nfsd4_open_downgrade on file %pd\n",
7024	cstate->current_fh.fh_dentry);
7025
7026	/* We don't yet support WANT bits: */
7027	if (od->od_deleg_want)
7028	dprintk("NFSD: %s: od_deleg_want=0x%x ignored\n", __func__,
7029	od->od_deleg_want);
7030
7031	status = nfs4_preprocess_confirmed_seqid_op(cstate, seqid: od->od_seqid,
7032	stateid: &od->od_stateid, stpp: &stp, nn);
7033	if (status)
7034	goto out;
7035	status = nfserr_inval;
7036	if (!test_access(access: od->od_share_access, stp)) {
7037	dprintk("NFSD: access not a subset of current bitmap: 0x%hhx, input access=%08x\n",
7038	stp->st_access_bmap, od->od_share_access);
7039	goto put_stateid;
7040	}
7041	if (!test_deny(deny: od->od_share_deny, stp)) {
7042	dprintk("NFSD: deny not a subset of current bitmap: 0x%hhx, input deny=%08x\n",
7043	stp->st_deny_bmap, od->od_share_deny);
7044	goto put_stateid;
7045	}
7046	nfs4_stateid_downgrade(stp, to_access: od->od_share_access);
7047	reset_union_bmap_deny(deny: od->od_share_deny, stp);
7048	nfs4_inc_and_copy_stateid(dst: &od->od_stateid, stid: &stp->st_stid);
7049	status = nfs_ok;
7050	put_stateid:
7051	mutex_unlock(lock: &stp->st_mutex);
7052	nfs4_put_stid(s: &stp->st_stid);
7053	out:
7054	nfsd4_bump_seqid(cstate, nfserr: status);
7055	return status;
7056	}
7057
7058	static void nfsd4_close_open_stateid(struct nfs4_ol_stateid *s)
7059	{
7060	struct nfs4_client *clp = s->st_stid.sc_client;
7061	bool unhashed;
7062	LIST_HEAD(reaplist);
7063	struct nfs4_ol_stateid *stp;
7064
7065	spin_lock(lock: &clp->cl_lock);
7066	unhashed = unhash_open_stateid(stp: s, reaplist: &reaplist);
7067
7068	if (clp->cl_minorversion) {
7069	if (unhashed)
7070	put_ol_stateid_locked(stp: s, reaplist: &reaplist);
7071	spin_unlock(lock: &clp->cl_lock);
7072	list_for_each_entry(stp, &reaplist, st_locks)
7073	nfs4_free_cpntf_statelist(net: clp->net, stid: &stp->st_stid);
7074	free_ol_stateid_reaplist(reaplist: &reaplist);
7075	} else {
7076	spin_unlock(lock: &clp->cl_lock);
7077	free_ol_stateid_reaplist(reaplist: &reaplist);
7078	if (unhashed)
7079	move_to_close_lru(s, net: clp->net);
7080	}
7081	}
7082
7083	/*
7084	* nfs4_unlock_state() called after encode
7085	*/
7086	__be32
7087	nfsd4_close(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7088	union nfsd4_op_u *u)
7089	{
7090	struct nfsd4_close *close = &u->close;
7091	__be32 status;
7092	struct nfs4_ol_stateid *stp;
7093	struct net *net = SVC_NET(rqstp);
7094	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
7095
7096	dprintk("NFSD: nfsd4_close on file %pd\n",
7097	cstate->current_fh.fh_dentry);
7098
7099	status = nfs4_preprocess_seqid_op(cstate, seqid: close->cl_seqid,
7100	stateid: &close->cl_stateid,
7101	NFS4_OPEN_STID|NFS4_CLOSED_STID,
7102	stpp: &stp, nn);
7103	nfsd4_bump_seqid(cstate, nfserr: status);
7104	if (status)
7105	goto out;
7106
7107	stp->st_stid.sc_type = NFS4_CLOSED_STID;
7108
7109	/*
7110	* Technically we don't _really_ have to increment or copy it, since
7111	* it should just be gone after this operation and we clobber the
7112	* copied value below, but we continue to do so here just to ensure
7113	* that racing ops see that there was a state change.
7114	*/
7115	nfs4_inc_and_copy_stateid(dst: &close->cl_stateid, stid: &stp->st_stid);
7116
7117	nfsd4_close_open_stateid(s: stp);
7118	mutex_unlock(lock: &stp->st_mutex);
7119
7120	/* v4.1+ suggests that we send a special stateid in here, since the
7121	* clients should just ignore this anyway. Since this is not useful
7122	* for v4.0 clients either, we set it to the special close_stateid
7123	* universally.
7124	*
7125	* See RFC5661 section 18.2.4, and RFC7530 section 16.2.5
7126	*/
7127	memcpy(&close->cl_stateid, &close_stateid, sizeof(close->cl_stateid));
7128
7129	/* put reference from nfs4_preprocess_seqid_op */
7130	nfs4_put_stid(s: &stp->st_stid);
7131	out:
7132	return status;
7133	}
7134
7135	__be32
7136	nfsd4_delegreturn(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7137	union nfsd4_op_u *u)
7138	{
7139	struct nfsd4_delegreturn *dr = &u->delegreturn;
7140	struct nfs4_delegation *dp;
7141	stateid_t *stateid = &dr->dr_stateid;
7142	struct nfs4_stid *s;
7143	__be32 status;
7144	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
7145
7146	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7147	return status;
7148
7149	status = nfsd4_lookup_stateid(cstate, stateid, NFS4_DELEG_STID, s: &s, nn);
7150	if (status)
7151	goto out;
7152	dp = delegstateid(s);
7153	status = nfsd4_stid_check_stateid_generation(in: stateid, s: &dp->dl_stid, has_session: nfsd4_has_session(cs: cstate));
7154	if (status)
7155	goto put_stateid;
7156
7157	trace_nfsd_deleg_return(stp: stateid);
7158	wake_up_var(var: d_inode(dentry: cstate->current_fh.fh_dentry));
7159	destroy_delegation(dp);
7160	put_stateid:
7161	nfs4_put_stid(s: &dp->dl_stid);
7162	out:
7163	return status;
7164	}
7165
7166	/* last octet in a range */
7167	static inline u64
7168	last_byte_offset(u64 start, u64 len)
7169	{
7170	u64 end;
7171
7172	WARN_ON_ONCE(!len);
7173	end = start + len;
7174	return end > start ? end - 1: NFS4_MAX_UINT64;
7175	}
7176
7177	/*
7178	* TODO: Linux file offsets are _signed_ 64-bit quantities, which means that
7179	* we can't properly handle lock requests that go beyond the (2^63 - 1)-th
7180	* byte, because of sign extension problems. Since NFSv4 calls for 64-bit
7181	* locking, this prevents us from being completely protocol-compliant. The
7182	* real solution to this problem is to start using unsigned file offsets in
7183	* the VFS, but this is a very deep change!
7184	*/
7185	static inline void
7186	nfs4_transform_lock_offset(struct file_lock *lock)
7187	{
7188	if (lock->fl_start < 0)
7189	lock->fl_start = OFFSET_MAX;
7190	if (lock->fl_end < 0)
7191	lock->fl_end = OFFSET_MAX;
7192	}
7193
7194	static fl_owner_t
7195	nfsd4_lm_get_owner(fl_owner_t owner)
7196	{
7197	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7198
7199	nfs4_get_stateowner(sop: &lo->lo_owner);
7200	return owner;
7201	}
7202
7203	static void
7204	nfsd4_lm_put_owner(fl_owner_t owner)
7205	{
7206	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)owner;
7207
7208	if (lo)
7209	nfs4_put_stateowner(sop: &lo->lo_owner);
7210	}
7211
7212	/* return pointer to struct nfs4_client if client is expirable */
7213	static bool
7214	nfsd4_lm_lock_expirable(struct file_lock *cfl)
7215	{
7216	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)cfl->fl_owner;
7217	struct nfs4_client *clp = lo->lo_owner.so_client;
7218	struct nfsd_net *nn;
7219
7220	if (try_to_expire_client(clp)) {
7221	nn = net_generic(net: clp->net, id: nfsd_net_id);
7222	mod_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: 0);
7223	return true;
7224	}
7225	return false;
7226	}
7227
7228	/* schedule laundromat to run immediately and wait for it to complete */
7229	static void
7230	nfsd4_lm_expire_lock(void)
7231	{
7232	flush_workqueue(laundry_wq);
7233	}
7234
7235	static void
7236	nfsd4_lm_notify(struct file_lock *fl)
7237	{
7238	struct nfs4_lockowner *lo = (struct nfs4_lockowner *)fl->fl_owner;
7239	struct net *net = lo->lo_owner.so_client->net;
7240	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
7241	struct nfsd4_blocked_lock *nbl = container_of(fl,
7242	struct nfsd4_blocked_lock, nbl_lock);
7243	bool queue = false;
7244
7245	/* An empty list means that something else is going to be using it */
7246	spin_lock(lock: &nn->blocked_locks_lock);
7247	if (!list_empty(head: &nbl->nbl_list)) {
7248	list_del_init(entry: &nbl->nbl_list);
7249	list_del_init(entry: &nbl->nbl_lru);
7250	queue = true;
7251	}
7252	spin_unlock(lock: &nn->blocked_locks_lock);
7253
7254	if (queue) {
7255	trace_nfsd_cb_notify_lock(lo, nbl);
7256	nfsd4_run_cb(cb: &nbl->nbl_cb);
7257	}
7258	}
7259
7260	static const struct lock_manager_operations nfsd_posix_mng_ops = {
7261	.lm_mod_owner = THIS_MODULE,
7262	.lm_notify = nfsd4_lm_notify,
7263	.lm_get_owner = nfsd4_lm_get_owner,
7264	.lm_put_owner = nfsd4_lm_put_owner,
7265	.lm_lock_expirable = nfsd4_lm_lock_expirable,
7266	.lm_expire_lock = nfsd4_lm_expire_lock,
7267	};
7268
7269	static inline void
7270	nfs4_set_lock_denied(struct file_lock *fl, struct nfsd4_lock_denied *deny)
7271	{
7272	struct nfs4_lockowner *lo;
7273
7274	if (fl->fl_lmops == &nfsd_posix_mng_ops) {
7275	lo = (struct nfs4_lockowner *) fl->fl_owner;
7276	xdr_netobj_dup(dst: &deny->ld_owner, src: &lo->lo_owner.so_owner,
7277	GFP_KERNEL);
7278	if (!deny->ld_owner.data)
7279	/* We just don't care that much */
7280	goto nevermind;
7281	deny->ld_clientid = lo->lo_owner.so_client->cl_clientid;
7282	} else {
7283	nevermind:
7284	deny->ld_owner.len = 0;
7285	deny->ld_owner.data = NULL;
7286	deny->ld_clientid.cl_boot = 0;
7287	deny->ld_clientid.cl_id = 0;
7288	}
7289	deny->ld_start = fl->fl_start;
7290	deny->ld_length = NFS4_MAX_UINT64;
7291	if (fl->fl_end != NFS4_MAX_UINT64)
7292	deny->ld_length = fl->fl_end - fl->fl_start + 1;
7293	deny->ld_type = NFS4_READ_LT;
7294	if (fl->fl_type != F_RDLCK)
7295	deny->ld_type = NFS4_WRITE_LT;
7296	}
7297
7298	static struct nfs4_lockowner *
7299	find_lockowner_str_locked(struct nfs4_client *clp, struct xdr_netobj *owner)
7300	{
7301	unsigned int strhashval = ownerstr_hashval(ownername: owner);
7302	struct nfs4_stateowner *so;
7303
7304	lockdep_assert_held(&clp->cl_lock);
7305
7306	list_for_each_entry(so, &clp->cl_ownerstr_hashtbl[strhashval],
7307	so_strhash) {
7308	if (so->so_is_open_owner)
7309	continue;
7310	if (same_owner_str(sop: so, owner))
7311	return lockowner(so: nfs4_get_stateowner(sop: so));
7312	}
7313	return NULL;
7314	}
7315
7316	static struct nfs4_lockowner *
7317	find_lockowner_str(struct nfs4_client *clp, struct xdr_netobj *owner)
7318	{
7319	struct nfs4_lockowner *lo;
7320
7321	spin_lock(lock: &clp->cl_lock);
7322	lo = find_lockowner_str_locked(clp, owner);
7323	spin_unlock(lock: &clp->cl_lock);
7324	return lo;
7325	}
7326
7327	static void nfs4_unhash_lockowner(struct nfs4_stateowner *sop)
7328	{
7329	unhash_lockowner_locked(lo: lockowner(so: sop));
7330	}
7331
7332	static void nfs4_free_lockowner(struct nfs4_stateowner *sop)
7333	{
7334	struct nfs4_lockowner *lo = lockowner(so: sop);
7335
7336	kmem_cache_free(s: lockowner_slab, objp: lo);
7337	}
7338
7339	static const struct nfs4_stateowner_operations lockowner_ops = {
7340	.so_unhash = nfs4_unhash_lockowner,
7341	.so_free = nfs4_free_lockowner,
7342	};
7343
7344	/*
7345	* Alloc a lock owner structure.
7346	* Called in nfsd4_lock - therefore, OPEN and OPEN_CONFIRM (if needed) has
7347	* occurred.
7348	*
7349	* strhashval = ownerstr_hashval
7350	*/
7351	static struct nfs4_lockowner *
7352	alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp,
7353	struct nfs4_ol_stateid *open_stp,
7354	struct nfsd4_lock *lock)
7355	{
7356	struct nfs4_lockowner *lo, *ret;
7357
7358	lo = alloc_stateowner(slab: lockowner_slab, owner: &lock->lk_new_owner, clp);
7359	if (!lo)
7360	return NULL;
7361	INIT_LIST_HEAD(list: &lo->lo_blocked);
7362	INIT_LIST_HEAD(list: &lo->lo_owner.so_stateids);
7363	lo->lo_owner.so_is_open_owner = 0;
7364	lo->lo_owner.so_seqid = lock->lk_new_lock_seqid;
7365	lo->lo_owner.so_ops = &lockowner_ops;
7366	spin_lock(lock: &clp->cl_lock);
7367	ret = find_lockowner_str_locked(clp, owner: &lock->lk_new_owner);
7368	if (ret == NULL) {
7369	list_add(new: &lo->lo_owner.so_strhash,
7370	head: &clp->cl_ownerstr_hashtbl[strhashval]);
7371	ret = lo;
7372	} else
7373	nfs4_free_stateowner(sop: &lo->lo_owner);
7374
7375	spin_unlock(lock: &clp->cl_lock);
7376	return ret;
7377	}
7378
7379	static struct nfs4_ol_stateid *
7380	find_lock_stateid(const struct nfs4_lockowner *lo,
7381	const struct nfs4_ol_stateid *ost)
7382	{
7383	struct nfs4_ol_stateid *lst;
7384
7385	lockdep_assert_held(&ost->st_stid.sc_client->cl_lock);
7386
7387	/* If ost is not hashed, ost->st_locks will not be valid */
7388	if (!nfs4_ol_stateid_unhashed(stp: ost))
7389	list_for_each_entry(lst, &ost->st_locks, st_locks) {
7390	if (lst->st_stateowner == &lo->lo_owner) {
7391	refcount_inc(r: &lst->st_stid.sc_count);
7392	return lst;
7393	}
7394	}
7395	return NULL;
7396	}
7397
7398	static struct nfs4_ol_stateid *
7399	init_lock_stateid(struct nfs4_ol_stateid *stp, struct nfs4_lockowner *lo,
7400	struct nfs4_file *fp, struct inode *inode,
7401	struct nfs4_ol_stateid *open_stp)
7402	{
7403	struct nfs4_client *clp = lo->lo_owner.so_client;
7404	struct nfs4_ol_stateid *retstp;
7405
7406	mutex_init(&stp->st_mutex);
7407	mutex_lock_nested(lock: &stp->st_mutex, subclass: OPEN_STATEID_MUTEX);
7408	retry:
7409	spin_lock(lock: &clp->cl_lock);
7410	if (nfs4_ol_stateid_unhashed(stp: open_stp))
7411	goto out_close;
7412	retstp = find_lock_stateid(lo, ost: open_stp);
7413	if (retstp)
7414	goto out_found;
7415	refcount_inc(r: &stp->st_stid.sc_count);
7416	stp->st_stid.sc_type = NFS4_LOCK_STID;
7417	stp->st_stateowner = nfs4_get_stateowner(sop: &lo->lo_owner);
7418	get_nfs4_file(fi: fp);
7419	stp->st_stid.sc_file = fp;
7420	stp->st_access_bmap = 0;
7421	stp->st_deny_bmap = open_stp->st_deny_bmap;
7422	stp->st_openstp = open_stp;
7423	spin_lock(lock: &fp->fi_lock);
7424	list_add(new: &stp->st_locks, head: &open_stp->st_locks);
7425	list_add(new: &stp->st_perstateowner, head: &lo->lo_owner.so_stateids);
7426	list_add(new: &stp->st_perfile, head: &fp->fi_stateids);
7427	spin_unlock(lock: &fp->fi_lock);
7428	spin_unlock(lock: &clp->cl_lock);
7429	return stp;
7430	out_found:
7431	spin_unlock(lock: &clp->cl_lock);
7432	if (nfsd4_lock_ol_stateid(stp: retstp) != nfs_ok) {
7433	nfs4_put_stid(s: &retstp->st_stid);
7434	goto retry;
7435	}
7436	/* To keep mutex tracking happy */
7437	mutex_unlock(lock: &stp->st_mutex);
7438	return retstp;
7439	out_close:
7440	spin_unlock(lock: &clp->cl_lock);
7441	mutex_unlock(lock: &stp->st_mutex);
7442	return NULL;
7443	}
7444
7445	static struct nfs4_ol_stateid *
7446	find_or_create_lock_stateid(struct nfs4_lockowner *lo, struct nfs4_file *fi,
7447	struct inode *inode, struct nfs4_ol_stateid *ost,
7448	bool *new)
7449	{
7450	struct nfs4_stid *ns = NULL;
7451	struct nfs4_ol_stateid *lst;
7452	struct nfs4_openowner *oo = openowner(so: ost->st_stateowner);
7453	struct nfs4_client *clp = oo->oo_owner.so_client;
7454
7455	*new = false;
7456	spin_lock(lock: &clp->cl_lock);
7457	lst = find_lock_stateid(lo, ost);
7458	spin_unlock(lock: &clp->cl_lock);
7459	if (lst != NULL) {
7460	if (nfsd4_lock_ol_stateid(stp: lst) == nfs_ok)
7461	goto out;
7462	nfs4_put_stid(s: &lst->st_stid);
7463	}
7464	ns = nfs4_alloc_stid(cl: clp, slab: stateid_slab, sc_free: nfs4_free_lock_stateid);
7465	if (ns == NULL)
7466	return NULL;
7467
7468	lst = init_lock_stateid(stp: openlockstateid(s: ns), lo, fp: fi, inode, open_stp: ost);
7469	if (lst == openlockstateid(s: ns))
7470	*new = true;
7471	else
7472	nfs4_put_stid(s: ns);
7473	out:
7474	return lst;
7475	}
7476
7477	static int
7478	check_lock_length(u64 offset, u64 length)
7479	{
7480	return ((length == 0) || ((length != NFS4_MAX_UINT64) &&
7481	(length > ~offset)));
7482	}
7483
7484	static void get_lock_access(struct nfs4_ol_stateid *lock_stp, u32 access)
7485	{
7486	struct nfs4_file *fp = lock_stp->st_stid.sc_file;
7487
7488	lockdep_assert_held(&fp->fi_lock);
7489
7490	if (test_access(access, stp: lock_stp))
7491	return;
7492	__nfs4_file_get_access(fp, access);
7493	set_access(access, stp: lock_stp);
7494	}
7495
7496	static __be32
7497	lookup_or_create_lock_state(struct nfsd4_compound_state *cstate,
7498	struct nfs4_ol_stateid *ost,
7499	struct nfsd4_lock *lock,
7500	struct nfs4_ol_stateid **plst, bool *new)
7501	{
7502	__be32 status;
7503	struct nfs4_file *fi = ost->st_stid.sc_file;
7504	struct nfs4_openowner *oo = openowner(so: ost->st_stateowner);
7505	struct nfs4_client *cl = oo->oo_owner.so_client;
7506	struct inode *inode = d_inode(dentry: cstate->current_fh.fh_dentry);
7507	struct nfs4_lockowner *lo;
7508	struct nfs4_ol_stateid *lst;
7509	unsigned int strhashval;
7510
7511	lo = find_lockowner_str(clp: cl, owner: &lock->lk_new_owner);
7512	if (!lo) {
7513	strhashval = ownerstr_hashval(ownername: &lock->lk_new_owner);
7514	lo = alloc_init_lock_stateowner(strhashval, clp: cl, open_stp: ost, lock);
7515	if (lo == NULL)
7516	return nfserr_jukebox;
7517	} else {
7518	/* with an existing lockowner, seqids must be the same */
7519	status = nfserr_bad_seqid;
7520	if (!cstate->minorversion &&
7521	lock->lk_new_lock_seqid != lo->lo_owner.so_seqid)
7522	goto out;
7523	}
7524
7525	lst = find_or_create_lock_stateid(lo, fi, inode, ost, new);
7526	if (lst == NULL) {
7527	status = nfserr_jukebox;
7528	goto out;
7529	}
7530
7531	status = nfs_ok;
7532	*plst = lst;
7533	out:
7534	nfs4_put_stateowner(sop: &lo->lo_owner);
7535	return status;
7536	}
7537
7538	/*
7539	* LOCK operation
7540	*/
7541	__be32
7542	nfsd4_lock(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7543	union nfsd4_op_u *u)
7544	{
7545	struct nfsd4_lock *lock = &u->lock;
7546	struct nfs4_openowner *open_sop = NULL;
7547	struct nfs4_lockowner *lock_sop = NULL;
7548	struct nfs4_ol_stateid *lock_stp = NULL;
7549	struct nfs4_ol_stateid *open_stp = NULL;
7550	struct nfs4_file *fp;
7551	struct nfsd_file *nf = NULL;
7552	struct nfsd4_blocked_lock *nbl = NULL;
7553	struct file_lock *file_lock = NULL;
7554	struct file_lock *conflock = NULL;
7555	struct super_block *sb;
7556	__be32 status = 0;
7557	int lkflg;
7558	int err;
7559	bool new = false;
7560	unsigned char fl_type;
7561	unsigned int fl_flags = FL_POSIX;
7562	struct net *net = SVC_NET(rqstp);
7563	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
7564
7565	dprintk("NFSD: nfsd4_lock: start=%Ld length=%Ld\n",
7566	(long long) lock->lk_offset,
7567	(long long) lock->lk_length);
7568
7569	if (check_lock_length(offset: lock->lk_offset, length: lock->lk_length))
7570	return nfserr_inval;
7571
7572	if ((status = fh_verify(rqstp, &cstate->current_fh,
7573	S_IFREG, NFSD_MAY_LOCK))) {
7574	dprintk("NFSD: nfsd4_lock: permission denied!\n");
7575	return status;
7576	}
7577	sb = cstate->current_fh.fh_dentry->d_sb;
7578
7579	if (lock->lk_is_new) {
7580	if (nfsd4_has_session(cs: cstate))
7581	/* See rfc 5661 18.10.3: given clientid is ignored: */
7582	memcpy(&lock->lk_new_clientid,
7583	&cstate->clp->cl_clientid,
7584	sizeof(clientid_t));
7585
7586	/* validate and update open stateid and open seqid */
7587	status = nfs4_preprocess_confirmed_seqid_op(cstate,
7588	seqid: lock->lk_new_open_seqid,
7589	stateid: &lock->lk_new_open_stateid,
7590	stpp: &open_stp, nn);
7591	if (status)
7592	goto out;
7593	mutex_unlock(lock: &open_stp->st_mutex);
7594	open_sop = openowner(so: open_stp->st_stateowner);
7595	status = nfserr_bad_stateid;
7596	if (!same_clid(cl1: &open_sop->oo_owner.so_client->cl_clientid,
7597	cl2: &lock->lk_new_clientid))
7598	goto out;
7599	status = lookup_or_create_lock_state(cstate, ost: open_stp, lock,
7600	plst: &lock_stp, new: &new);
7601	} else {
7602	status = nfs4_preprocess_seqid_op(cstate,
7603	seqid: lock->lk_old_lock_seqid,
7604	stateid: &lock->lk_old_lock_stateid,
7605	NFS4_LOCK_STID, stpp: &lock_stp, nn);
7606	}
7607	if (status)
7608	goto out;
7609	lock_sop = lockowner(so: lock_stp->st_stateowner);
7610
7611	lkflg = setlkflg(lock->lk_type);
7612	status = nfs4_check_openmode(stp: lock_stp, flags: lkflg);
7613	if (status)
7614	goto out;
7615
7616	status = nfserr_grace;
7617	if (locks_in_grace(net) && !lock->lk_reclaim)
7618	goto out;
7619	status = nfserr_no_grace;
7620	if (!locks_in_grace(net) && lock->lk_reclaim)
7621	goto out;
7622
7623	if (lock->lk_reclaim)
7624	fl_flags |= FL_RECLAIM;
7625
7626	fp = lock_stp->st_stid.sc_file;
7627	switch (lock->lk_type) {
7628	case NFS4_READW_LT:
7629	if (nfsd4_has_session(cs: cstate) ||
7630	exportfs_lock_op_is_async(export_ops: sb->s_export_op))
7631	fl_flags |= FL_SLEEP;
7632	fallthrough;
7633	case NFS4_READ_LT:
7634	spin_lock(lock: &fp->fi_lock);
7635	nf = find_readable_file_locked(f: fp);
7636	if (nf)
7637	get_lock_access(lock_stp, NFS4_SHARE_ACCESS_READ);
7638	spin_unlock(lock: &fp->fi_lock);
7639	fl_type = F_RDLCK;
7640	break;
7641	case NFS4_WRITEW_LT:
7642	if (nfsd4_has_session(cs: cstate) ||
7643	exportfs_lock_op_is_async(export_ops: sb->s_export_op))
7644	fl_flags |= FL_SLEEP;
7645	fallthrough;
7646	case NFS4_WRITE_LT:
7647	spin_lock(lock: &fp->fi_lock);
7648	nf = find_writeable_file_locked(f: fp);
7649	if (nf)
7650	get_lock_access(lock_stp, NFS4_SHARE_ACCESS_WRITE);
7651	spin_unlock(lock: &fp->fi_lock);
7652	fl_type = F_WRLCK;
7653	break;
7654	default:
7655	status = nfserr_inval;
7656	goto out;
7657	}
7658
7659	if (!nf) {
7660	status = nfserr_openmode;
7661	goto out;
7662	}
7663
7664	/*
7665	* Most filesystems with their own ->lock operations will block
7666	* the nfsd thread waiting to acquire the lock. That leads to
7667	* deadlocks (we don't want every nfsd thread tied up waiting
7668	* for file locks), so don't attempt blocking lock notifications
7669	* on those filesystems:
7670	*/
7671	if (!exportfs_lock_op_is_async(export_ops: sb->s_export_op))
7672	fl_flags &= ~FL_SLEEP;
7673
7674	nbl = find_or_allocate_block(lo: lock_sop, fh: &fp->fi_fhandle, nn);
7675	if (!nbl) {
7676	dprintk("NFSD: %s: unable to allocate block!\n", __func__);
7677	status = nfserr_jukebox;
7678	goto out;
7679	}
7680
7681	file_lock = &nbl->nbl_lock;
7682	file_lock->fl_type = fl_type;
7683	file_lock->fl_owner = (fl_owner_t)lockowner(so: nfs4_get_stateowner(sop: &lock_sop->lo_owner));
7684	file_lock->fl_pid = current->tgid;
7685	file_lock->fl_file = nf->nf_file;
7686	file_lock->fl_flags = fl_flags;
7687	file_lock->fl_lmops = &nfsd_posix_mng_ops;
7688	file_lock->fl_start = lock->lk_offset;
7689	file_lock->fl_end = last_byte_offset(start: lock->lk_offset, len: lock->lk_length);
7690	nfs4_transform_lock_offset(lock: file_lock);
7691
7692	conflock = locks_alloc_lock();
7693	if (!conflock) {
7694	dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7695	status = nfserr_jukebox;
7696	goto out;
7697	}
7698
7699	if (fl_flags & FL_SLEEP) {
7700	nbl->nbl_time = ktime_get_boottime_seconds();
7701	spin_lock(lock: &nn->blocked_locks_lock);
7702	list_add_tail(new: &nbl->nbl_list, head: &lock_sop->lo_blocked);
7703	list_add_tail(new: &nbl->nbl_lru, head: &nn->blocked_locks_lru);
7704	kref_get(kref: &nbl->nbl_kref);
7705	spin_unlock(lock: &nn->blocked_locks_lock);
7706	}
7707
7708	err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, conflock);
7709	switch (err) {
7710	case 0: /* success! */
7711	nfs4_inc_and_copy_stateid(dst: &lock->lk_resp_stateid, stid: &lock_stp->st_stid);
7712	status = 0;
7713	if (lock->lk_reclaim)
7714	nn->somebody_reclaimed = true;
7715	break;
7716	case FILE_LOCK_DEFERRED:
7717	kref_put(kref: &nbl->nbl_kref, release: free_nbl);
7718	nbl = NULL;
7719	fallthrough;
7720	case -EAGAIN: /* conflock holds conflicting lock */
7721	status = nfserr_denied;
7722	dprintk("NFSD: nfsd4_lock: conflicting lock found!\n");
7723	nfs4_set_lock_denied(fl: conflock, deny: &lock->lk_denied);
7724	break;
7725	case -EDEADLK:
7726	status = nfserr_deadlock;
7727	break;
7728	default:
7729	dprintk("NFSD: nfsd4_lock: vfs_lock_file() failed! status %d\n",err);
7730	status = nfserrno(errno: err);
7731	break;
7732	}
7733	out:
7734	if (nbl) {
7735	/* dequeue it if we queued it before */
7736	if (fl_flags & FL_SLEEP) {
7737	spin_lock(lock: &nn->blocked_locks_lock);
7738	if (!list_empty(head: &nbl->nbl_list) &&
7739	!list_empty(head: &nbl->nbl_lru)) {
7740	list_del_init(entry: &nbl->nbl_list);
7741	list_del_init(entry: &nbl->nbl_lru);
7742	kref_put(kref: &nbl->nbl_kref, release: free_nbl);
7743	}
7744	/* nbl can use one of lists to be linked to reaplist */
7745	spin_unlock(lock: &nn->blocked_locks_lock);
7746	}
7747	free_blocked_lock(nbl);
7748	}
7749	if (nf)
7750	nfsd_file_put(nf);
7751	if (lock_stp) {
7752	/* Bump seqid manually if the 4.0 replay owner is openowner */
7753	if (cstate->replay_owner &&
7754	cstate->replay_owner != &lock_sop->lo_owner &&
7755	seqid_mutating_err(ntohl(status)))
7756	lock_sop->lo_owner.so_seqid++;
7757
7758	/*
7759	* If this is a new, never-before-used stateid, and we are
7760	* returning an error, then just go ahead and release it.
7761	*/
7762	if (status && new)
7763	release_lock_stateid(stp: lock_stp);
7764
7765	mutex_unlock(lock: &lock_stp->st_mutex);
7766
7767	nfs4_put_stid(s: &lock_stp->st_stid);
7768	}
7769	if (open_stp)
7770	nfs4_put_stid(s: &open_stp->st_stid);
7771	nfsd4_bump_seqid(cstate, nfserr: status);
7772	if (conflock)
7773	locks_free_lock(fl: conflock);
7774	return status;
7775	}
7776
7777	void nfsd4_lock_release(union nfsd4_op_u *u)
7778	{
7779	struct nfsd4_lock *lock = &u->lock;
7780	struct nfsd4_lock_denied *deny = &lock->lk_denied;
7781
7782	kfree(objp: deny->ld_owner.data);
7783	}
7784
7785	/*
7786	* The NFSv4 spec allows a client to do a LOCKT without holding an OPEN,
7787	* so we do a temporary open here just to get an open file to pass to
7788	* vfs_test_lock.
7789	*/
7790	static __be32 nfsd_test_lock(struct svc_rqst *rqstp, struct svc_fh *fhp, struct file_lock *lock)
7791	{
7792	struct nfsd_file *nf;
7793	struct inode *inode;
7794	__be32 err;
7795
7796	err = nfsd_file_acquire(rqstp, fhp, NFSD_MAY_READ, nfp: &nf);
7797	if (err)
7798	return err;
7799	inode = fhp->fh_dentry->d_inode;
7800	inode_lock(inode); /* to block new leases till after test_lock: */
7801	err = nfserrno(errno: nfsd_open_break_lease(inode, NFSD_MAY_READ));
7802	if (err)
7803	goto out;
7804	lock->fl_file = nf->nf_file;
7805	err = nfserrno(errno: vfs_test_lock(nf->nf_file, lock));
7806	lock->fl_file = NULL;
7807	out:
7808	inode_unlock(inode);
7809	nfsd_file_put(nf);
7810	return err;
7811	}
7812
7813	/*
7814	* LOCKT operation
7815	*/
7816	__be32
7817	nfsd4_lockt(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7818	union nfsd4_op_u *u)
7819	{
7820	struct nfsd4_lockt *lockt = &u->lockt;
7821	struct file_lock *file_lock = NULL;
7822	struct nfs4_lockowner *lo = NULL;
7823	__be32 status;
7824	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
7825
7826	if (locks_in_grace(SVC_NET(rqstp)))
7827	return nfserr_grace;
7828
7829	if (check_lock_length(offset: lockt->lt_offset, length: lockt->lt_length))
7830	return nfserr_inval;
7831
7832	if (!nfsd4_has_session(cs: cstate)) {
7833	status = set_client(clid: &lockt->lt_clientid, cstate, nn);
7834	if (status)
7835	goto out;
7836	}
7837
7838	if ((status = fh_verify(rqstp, &cstate->current_fh, S_IFREG, 0)))
7839	goto out;
7840
7841	file_lock = locks_alloc_lock();
7842	if (!file_lock) {
7843	dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7844	status = nfserr_jukebox;
7845	goto out;
7846	}
7847
7848	switch (lockt->lt_type) {
7849	case NFS4_READ_LT:
7850	case NFS4_READW_LT:
7851	file_lock->fl_type = F_RDLCK;
7852	break;
7853	case NFS4_WRITE_LT:
7854	case NFS4_WRITEW_LT:
7855	file_lock->fl_type = F_WRLCK;
7856	break;
7857	default:
7858	dprintk("NFSD: nfs4_lockt: bad lock type!\n");
7859	status = nfserr_inval;
7860	goto out;
7861	}
7862
7863	lo = find_lockowner_str(clp: cstate->clp, owner: &lockt->lt_owner);
7864	if (lo)
7865	file_lock->fl_owner = (fl_owner_t)lo;
7866	file_lock->fl_pid = current->tgid;
7867	file_lock->fl_flags = FL_POSIX;
7868
7869	file_lock->fl_start = lockt->lt_offset;
7870	file_lock->fl_end = last_byte_offset(start: lockt->lt_offset, len: lockt->lt_length);
7871
7872	nfs4_transform_lock_offset(lock: file_lock);
7873
7874	status = nfsd_test_lock(rqstp, fhp: &cstate->current_fh, lock: file_lock);
7875	if (status)
7876	goto out;
7877
7878	if (file_lock->fl_type != F_UNLCK) {
7879	status = nfserr_denied;
7880	nfs4_set_lock_denied(fl: file_lock, deny: &lockt->lt_denied);
7881	}
7882	out:
7883	if (lo)
7884	nfs4_put_stateowner(sop: &lo->lo_owner);
7885	if (file_lock)
7886	locks_free_lock(fl: file_lock);
7887	return status;
7888	}
7889
7890	void nfsd4_lockt_release(union nfsd4_op_u *u)
7891	{
7892	struct nfsd4_lockt *lockt = &u->lockt;
7893	struct nfsd4_lock_denied *deny = &lockt->lt_denied;
7894
7895	kfree(objp: deny->ld_owner.data);
7896	}
7897
7898	__be32
7899	nfsd4_locku(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
7900	union nfsd4_op_u *u)
7901	{
7902	struct nfsd4_locku *locku = &u->locku;
7903	struct nfs4_ol_stateid *stp;
7904	struct nfsd_file *nf = NULL;
7905	struct file_lock *file_lock = NULL;
7906	__be32 status;
7907	int err;
7908	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
7909
7910	dprintk("NFSD: nfsd4_locku: start=%Ld length=%Ld\n",
7911	(long long) locku->lu_offset,
7912	(long long) locku->lu_length);
7913
7914	if (check_lock_length(offset: locku->lu_offset, length: locku->lu_length))
7915	return nfserr_inval;
7916
7917	status = nfs4_preprocess_seqid_op(cstate, seqid: locku->lu_seqid,
7918	stateid: &locku->lu_stateid, NFS4_LOCK_STID,
7919	stpp: &stp, nn);
7920	if (status)
7921	goto out;
7922	nf = find_any_file(f: stp->st_stid.sc_file);
7923	if (!nf) {
7924	status = nfserr_lock_range;
7925	goto put_stateid;
7926	}
7927	file_lock = locks_alloc_lock();
7928	if (!file_lock) {
7929	dprintk("NFSD: %s: unable to allocate lock!\n", __func__);
7930	status = nfserr_jukebox;
7931	goto put_file;
7932	}
7933
7934	file_lock->fl_type = F_UNLCK;
7935	file_lock->fl_owner = (fl_owner_t)lockowner(so: nfs4_get_stateowner(sop: stp->st_stateowner));
7936	file_lock->fl_pid = current->tgid;
7937	file_lock->fl_file = nf->nf_file;
7938	file_lock->fl_flags = FL_POSIX;
7939	file_lock->fl_lmops = &nfsd_posix_mng_ops;
7940	file_lock->fl_start = locku->lu_offset;
7941
7942	file_lock->fl_end = last_byte_offset(start: locku->lu_offset,
7943	len: locku->lu_length);
7944	nfs4_transform_lock_offset(lock: file_lock);
7945
7946	err = vfs_lock_file(nf->nf_file, F_SETLK, file_lock, NULL);
7947	if (err) {
7948	dprintk("NFSD: nfs4_locku: vfs_lock_file failed!\n");
7949	goto out_nfserr;
7950	}
7951	nfs4_inc_and_copy_stateid(dst: &locku->lu_stateid, stid: &stp->st_stid);
7952	put_file:
7953	nfsd_file_put(nf);
7954	put_stateid:
7955	mutex_unlock(lock: &stp->st_mutex);
7956	nfs4_put_stid(s: &stp->st_stid);
7957	out:
7958	nfsd4_bump_seqid(cstate, nfserr: status);
7959	if (file_lock)
7960	locks_free_lock(fl: file_lock);
7961	return status;
7962
7963	out_nfserr:
7964	status = nfserrno(errno: err);
7965	goto put_file;
7966	}
7967
7968	/*
7969	* returns
7970	* true: locks held by lockowner
7971	* false: no locks held by lockowner
7972	*/
7973	static bool
7974	check_for_locks(struct nfs4_file *fp, struct nfs4_lockowner *lowner)
7975	{
7976	struct file_lock *fl;
7977	int status = false;
7978	struct nfsd_file *nf = find_any_file(f: fp);
7979	struct inode *inode;
7980	struct file_lock_context *flctx;
7981
7982	if (!nf) {
7983	/* Any valid lock stateid should have some sort of access */
7984	WARN_ON_ONCE(1);
7985	return status;
7986	}
7987
7988	inode = file_inode(f: nf->nf_file);
7989	flctx = locks_inode_context(inode);
7990
7991	if (flctx && !list_empty_careful(head: &flctx->flc_posix)) {
7992	spin_lock(lock: &flctx->flc_lock);
7993	list_for_each_entry(fl, &flctx->flc_posix, fl_list) {
7994	if (fl->fl_owner == (fl_owner_t)lowner) {
7995	status = true;
7996	break;
7997	}
7998	}
7999	spin_unlock(lock: &flctx->flc_lock);
8000	}
8001	nfsd_file_put(nf);
8002	return status;
8003	}
8004
8005	/**
8006	* nfsd4_release_lockowner - process NFSv4.0 RELEASE_LOCKOWNER operations
8007	* @rqstp: RPC transaction
8008	* @cstate: NFSv4 COMPOUND state
8009	* @u: RELEASE_LOCKOWNER arguments
8010	*
8011	* The lockowner's so_count is bumped when a lock record is added
8012	* or when copying a conflicting lock. The latter case is brief,
8013	* but can lead to fleeting false positives when looking for
8014	* locks-in-use.
8015	*
8016	* Return values:
8017	* %nfs_ok: lockowner released or not found
8018	* %nfserr_locks_held: lockowner still in use
8019	* %nfserr_stale_clientid: clientid no longer active
8020	* %nfserr_expired: clientid not recognized
8021	*/
8022	__be32
8023	nfsd4_release_lockowner(struct svc_rqst *rqstp,
8024	struct nfsd4_compound_state *cstate,
8025	union nfsd4_op_u *u)
8026	{
8027	struct nfsd4_release_lockowner *rlockowner = &u->release_lockowner;
8028	struct nfsd_net *nn = net_generic(SVC_NET(rqstp), id: nfsd_net_id);
8029	clientid_t *clid = &rlockowner->rl_clientid;
8030	struct nfs4_ol_stateid *stp;
8031	struct nfs4_lockowner *lo;
8032	struct nfs4_client *clp;
8033	LIST_HEAD(reaplist);
8034	__be32 status;
8035
8036	dprintk("nfsd4_release_lockowner clientid: (%08x/%08x):\n",
8037	clid->cl_boot, clid->cl_id);
8038
8039	status = set_client(clid, cstate, nn);
8040	if (status)
8041	return status;
8042	clp = cstate->clp;
8043
8044	spin_lock(lock: &clp->cl_lock);
8045	lo = find_lockowner_str_locked(clp, owner: &rlockowner->rl_owner);
8046	if (!lo) {
8047	spin_unlock(lock: &clp->cl_lock);
8048	return nfs_ok;
8049	}
8050	if (atomic_read(v: &lo->lo_owner.so_count) != 2) {
8051	spin_unlock(lock: &clp->cl_lock);
8052	nfs4_put_stateowner(sop: &lo->lo_owner);
8053	return nfserr_locks_held;
8054	}
8055	unhash_lockowner_locked(lo);
8056	while (!list_empty(head: &lo->lo_owner.so_stateids)) {
8057	stp = list_first_entry(&lo->lo_owner.so_stateids,
8058	struct nfs4_ol_stateid,
8059	st_perstateowner);
8060	WARN_ON(!unhash_lock_stateid(stp));
8061	put_ol_stateid_locked(stp, reaplist: &reaplist);
8062	}
8063	spin_unlock(lock: &clp->cl_lock);
8064
8065	free_ol_stateid_reaplist(reaplist: &reaplist);
8066	remove_blocked_locks(lo);
8067	nfs4_put_stateowner(sop: &lo->lo_owner);
8068	return nfs_ok;
8069	}
8070
8071	static inline struct nfs4_client_reclaim *
8072	alloc_reclaim(void)
8073	{
8074	return kmalloc(size: sizeof(struct nfs4_client_reclaim), GFP_KERNEL);
8075	}
8076
8077	bool
8078	nfs4_has_reclaimed_state(struct xdr_netobj name, struct nfsd_net *nn)
8079	{
8080	struct nfs4_client_reclaim *crp;
8081
8082	crp = nfsd4_find_reclaim_client(name, nn);
8083	return (crp && crp->cr_clp);
8084	}
8085
8086	/*
8087	* failure => all reset bets are off, nfserr_no_grace...
8088	*
8089	* The caller is responsible for freeing name.data if NULL is returned (it
8090	* will be freed in nfs4_remove_reclaim_record in the normal case).
8091	*/
8092	struct nfs4_client_reclaim *
8093	nfs4_client_to_reclaim(struct xdr_netobj name, struct xdr_netobj princhash,
8094	struct nfsd_net *nn)
8095	{
8096	unsigned int strhashval;
8097	struct nfs4_client_reclaim *crp;
8098
8099	crp = alloc_reclaim();
8100	if (crp) {
8101	strhashval = clientstr_hashval(name);
8102	INIT_LIST_HEAD(list: &crp->cr_strhash);
8103	list_add(new: &crp->cr_strhash, head: &nn->reclaim_str_hashtbl[strhashval]);
8104	crp->cr_name.data = name.data;
8105	crp->cr_name.len = name.len;
8106	crp->cr_princhash.data = princhash.data;
8107	crp->cr_princhash.len = princhash.len;
8108	crp->cr_clp = NULL;
8109	nn->reclaim_str_hashtbl_size++;
8110	}
8111	return crp;
8112	}
8113
8114	void
8115	nfs4_remove_reclaim_record(struct nfs4_client_reclaim *crp, struct nfsd_net *nn)
8116	{
8117	list_del(entry: &crp->cr_strhash);
8118	kfree(objp: crp->cr_name.data);
8119	kfree(objp: crp->cr_princhash.data);
8120	kfree(objp: crp);
8121	nn->reclaim_str_hashtbl_size--;
8122	}
8123
8124	void
8125	nfs4_release_reclaim(struct nfsd_net *nn)
8126	{
8127	struct nfs4_client_reclaim *crp = NULL;
8128	int i;
8129
8130	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8131	while (!list_empty(head: &nn->reclaim_str_hashtbl[i])) {
8132	crp = list_entry(nn->reclaim_str_hashtbl[i].next,
8133	struct nfs4_client_reclaim, cr_strhash);
8134	nfs4_remove_reclaim_record(crp, nn);
8135	}
8136	}
8137	WARN_ON_ONCE(nn->reclaim_str_hashtbl_size);
8138	}
8139
8140	/*
8141	* called from OPEN, CLAIM_PREVIOUS with a new clientid. */
8142	struct nfs4_client_reclaim *
8143	nfsd4_find_reclaim_client(struct xdr_netobj name, struct nfsd_net *nn)
8144	{
8145	unsigned int strhashval;
8146	struct nfs4_client_reclaim *crp = NULL;
8147
8148	strhashval = clientstr_hashval(name);
8149	list_for_each_entry(crp, &nn->reclaim_str_hashtbl[strhashval], cr_strhash) {
8150	if (compare_blob(o1: &crp->cr_name, o2: &name) == 0) {
8151	return crp;
8152	}
8153	}
8154	return NULL;
8155	}
8156
8157	__be32
8158	nfs4_check_open_reclaim(struct nfs4_client *clp)
8159	{
8160	if (test_bit(NFSD4_CLIENT_RECLAIM_COMPLETE, &clp->cl_flags))
8161	return nfserr_no_grace;
8162
8163	if (nfsd4_client_record_check(clp))
8164	return nfserr_reclaim_bad;
8165
8166	return nfs_ok;
8167	}
8168
8169	/*
8170	* Since the lifetime of a delegation isn't limited to that of an open, a
8171	* client may quite reasonably hang on to a delegation as long as it has
8172	* the inode cached. This becomes an obvious problem the first time a
8173	* client's inode cache approaches the size of the server's total memory.
8174	*
8175	* For now we avoid this problem by imposing a hard limit on the number
8176	* of delegations, which varies according to the server's memory size.
8177	*/
8178	static void
8179	set_max_delegations(void)
8180	{
8181	/*
8182	* Allow at most 4 delegations per megabyte of RAM. Quick
8183	* estimates suggest that in the worst case (where every delegation
8184	* is for a different inode), a delegation could take about 1.5K,
8185	* giving a worst case usage of about 6% of memory.
8186	*/
8187	max_delegations = nr_free_buffer_pages() >> (20 - 2 - PAGE_SHIFT);
8188	}
8189
8190	static int nfs4_state_create_net(struct net *net)
8191	{
8192	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
8193	int i;
8194
8195	nn->conf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8196	size: sizeof(struct list_head),
8197	GFP_KERNEL);
8198	if (!nn->conf_id_hashtbl)
8199	goto err;
8200	nn->unconf_id_hashtbl = kmalloc_array(CLIENT_HASH_SIZE,
8201	size: sizeof(struct list_head),
8202	GFP_KERNEL);
8203	if (!nn->unconf_id_hashtbl)
8204	goto err_unconf_id;
8205	nn->sessionid_hashtbl = kmalloc_array(SESSION_HASH_SIZE,
8206	size: sizeof(struct list_head),
8207	GFP_KERNEL);
8208	if (!nn->sessionid_hashtbl)
8209	goto err_sessionid;
8210
8211	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8212	INIT_LIST_HEAD(list: &nn->conf_id_hashtbl[i]);
8213	INIT_LIST_HEAD(list: &nn->unconf_id_hashtbl[i]);
8214	}
8215	for (i = 0; i < SESSION_HASH_SIZE; i++)
8216	INIT_LIST_HEAD(list: &nn->sessionid_hashtbl[i]);
8217	nn->conf_name_tree = RB_ROOT;
8218	nn->unconf_name_tree = RB_ROOT;
8219	nn->boot_time = ktime_get_real_seconds();
8220	nn->grace_ended = false;
8221	nn->nfsd4_manager.block_opens = true;
8222	INIT_LIST_HEAD(list: &nn->nfsd4_manager.list);
8223	INIT_LIST_HEAD(list: &nn->client_lru);
8224	INIT_LIST_HEAD(list: &nn->close_lru);
8225	INIT_LIST_HEAD(list: &nn->del_recall_lru);
8226	spin_lock_init(&nn->client_lock);
8227	spin_lock_init(&nn->s2s_cp_lock);
8228	idr_init(idr: &nn->s2s_cp_stateids);
8229
8230	spin_lock_init(&nn->blocked_locks_lock);
8231	INIT_LIST_HEAD(list: &nn->blocked_locks_lru);
8232
8233	INIT_DELAYED_WORK(&nn->laundromat_work, laundromat_main);
8234	INIT_WORK(&nn->nfsd_shrinker_work, nfsd4_state_shrinker_worker);
8235	get_net(net);
8236
8237	nn->nfsd_client_shrinker = shrinker_alloc(flags: 0, fmt: "nfsd-client");
8238	if (!nn->nfsd_client_shrinker)
8239	goto err_shrinker;
8240
8241	nn->nfsd_client_shrinker->scan_objects = nfsd4_state_shrinker_scan;
8242	nn->nfsd_client_shrinker->count_objects = nfsd4_state_shrinker_count;
8243	nn->nfsd_client_shrinker->private_data = nn;
8244
8245	shrinker_register(shrinker: nn->nfsd_client_shrinker);
8246
8247	return 0;
8248
8249	err_shrinker:
8250	put_net(net);
8251	kfree(objp: nn->sessionid_hashtbl);
8252	err_sessionid:
8253	kfree(objp: nn->unconf_id_hashtbl);
8254	err_unconf_id:
8255	kfree(objp: nn->conf_id_hashtbl);
8256	err:
8257	return -ENOMEM;
8258	}
8259
8260	static void
8261	nfs4_state_destroy_net(struct net *net)
8262	{
8263	int i;
8264	struct nfs4_client *clp = NULL;
8265	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
8266
8267	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8268	while (!list_empty(head: &nn->conf_id_hashtbl[i])) {
8269	clp = list_entry(nn->conf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8270	destroy_client(clp);
8271	}
8272	}
8273
8274	WARN_ON(!list_empty(&nn->blocked_locks_lru));
8275
8276	for (i = 0; i < CLIENT_HASH_SIZE; i++) {
8277	while (!list_empty(head: &nn->unconf_id_hashtbl[i])) {
8278	clp = list_entry(nn->unconf_id_hashtbl[i].next, struct nfs4_client, cl_idhash);
8279	destroy_client(clp);
8280	}
8281	}
8282
8283	kfree(objp: nn->sessionid_hashtbl);
8284	kfree(objp: nn->unconf_id_hashtbl);
8285	kfree(objp: nn->conf_id_hashtbl);
8286	put_net(net);
8287	}
8288
8289	int
8290	nfs4_state_start_net(struct net *net)
8291	{
8292	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
8293	int ret;
8294
8295	ret = nfs4_state_create_net(net);
8296	if (ret)
8297	return ret;
8298	locks_start_grace(net, &nn->nfsd4_manager);
8299	nfsd4_client_tracking_init(net);
8300	if (nn->track_reclaim_completes && nn->reclaim_str_hashtbl_size == 0)
8301	goto skip_grace;
8302	printk(KERN_INFO "NFSD: starting %lld-second grace period (net %x)\n",
8303	nn->nfsd4_grace, net->ns.inum);
8304	trace_nfsd_grace_start(nn);
8305	queue_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: nn->nfsd4_grace * HZ);
8306	return 0;
8307
8308	skip_grace:
8309	printk(KERN_INFO "NFSD: no clients to reclaim, skipping NFSv4 grace period (net %x)\n",
8310	net->ns.inum);
8311	queue_delayed_work(wq: laundry_wq, dwork: &nn->laundromat_work, delay: nn->nfsd4_lease * HZ);
8312	nfsd4_end_grace(nn);
8313	return 0;
8314	}
8315
8316	/* initialization to perform when the nfsd service is started: */
8317
8318	int
8319	nfs4_state_start(void)
8320	{
8321	int ret;
8322
8323	ret = rhltable_init(hlt: &nfs4_file_rhltable, params: &nfs4_file_rhash_params);
8324	if (ret)
8325	return ret;
8326
8327	ret = nfsd4_create_callback_queue();
8328	if (ret) {
8329	rhltable_destroy(hlt: &nfs4_file_rhltable);
8330	return ret;
8331	}
8332
8333	set_max_delegations();
8334	return 0;
8335	}
8336
8337	void
8338	nfs4_state_shutdown_net(struct net *net)
8339	{
8340	struct nfs4_delegation *dp = NULL;
8341	struct list_head *pos, *next, reaplist;
8342	struct nfsd_net *nn = net_generic(net, id: nfsd_net_id);
8343
8344	shrinker_free(shrinker: nn->nfsd_client_shrinker);
8345	cancel_work(work: &nn->nfsd_shrinker_work);
8346	cancel_delayed_work_sync(dwork: &nn->laundromat_work);
8347	locks_end_grace(&nn->nfsd4_manager);
8348
8349	INIT_LIST_HEAD(list: &reaplist);
8350	spin_lock(lock: &state_lock);
8351	list_for_each_safe(pos, next, &nn->del_recall_lru) {
8352	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8353	WARN_ON(!unhash_delegation_locked(dp));
8354	list_add(new: &dp->dl_recall_lru, head: &reaplist);
8355	}
8356	spin_unlock(lock: &state_lock);
8357	list_for_each_safe(pos, next, &reaplist) {
8358	dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
8359	list_del_init(entry: &dp->dl_recall_lru);
8360	destroy_unhashed_deleg(dp);
8361	}
8362
8363	nfsd4_client_tracking_exit(net);
8364	nfs4_state_destroy_net(net);
8365	#ifdef CONFIG_NFSD_V4_2_INTER_SSC
8366	nfsd4_ssc_shutdown_umount(nn);
8367	#endif
8368	}
8369
8370	void
8371	nfs4_state_shutdown(void)
8372	{
8373	nfsd4_destroy_callback_queue();
8374	rhltable_destroy(hlt: &nfs4_file_rhltable);
8375	}
8376
8377	static void
8378	get_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8379	{
8380	if (HAS_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG) &&
8381	CURRENT_STATEID(stateid))
8382	memcpy(stateid, &cstate->current_stateid, sizeof(stateid_t));
8383	}
8384
8385	static void
8386	put_stateid(struct nfsd4_compound_state *cstate, stateid_t *stateid)
8387	{
8388	if (cstate->minorversion) {
8389	memcpy(&cstate->current_stateid, stateid, sizeof(stateid_t));
8390	SET_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8391	}
8392	}
8393
8394	void
8395	clear_current_stateid(struct nfsd4_compound_state *cstate)
8396	{
8397	CLEAR_CSTATE_FLAG(cstate, CURRENT_STATE_ID_FLAG);
8398	}
8399
8400	/*
8401	* functions to set current state id
8402	*/
8403	void
8404	nfsd4_set_opendowngradestateid(struct nfsd4_compound_state *cstate,
8405	union nfsd4_op_u *u)
8406	{
8407	put_stateid(cstate, stateid: &u->open_downgrade.od_stateid);
8408	}
8409
8410	void
8411	nfsd4_set_openstateid(struct nfsd4_compound_state *cstate,
8412	union nfsd4_op_u *u)
8413	{
8414	put_stateid(cstate, stateid: &u->open.op_stateid);
8415	}
8416
8417	void
8418	nfsd4_set_closestateid(struct nfsd4_compound_state *cstate,
8419	union nfsd4_op_u *u)
8420	{
8421	put_stateid(cstate, stateid: &u->close.cl_stateid);
8422	}
8423
8424	void
8425	nfsd4_set_lockstateid(struct nfsd4_compound_state *cstate,
8426	union nfsd4_op_u *u)
8427	{
8428	put_stateid(cstate, stateid: &u->lock.lk_resp_stateid);
8429	}
8430
8431	/*
8432	* functions to consume current state id
8433	*/
8434
8435	void
8436	nfsd4_get_opendowngradestateid(struct nfsd4_compound_state *cstate,
8437	union nfsd4_op_u *u)
8438	{
8439	get_stateid(cstate, stateid: &u->open_downgrade.od_stateid);
8440	}
8441
8442	void
8443	nfsd4_get_delegreturnstateid(struct nfsd4_compound_state *cstate,
8444	union nfsd4_op_u *u)
8445	{
8446	get_stateid(cstate, stateid: &u->delegreturn.dr_stateid);
8447	}
8448
8449	void
8450	nfsd4_get_freestateid(struct nfsd4_compound_state *cstate,
8451	union nfsd4_op_u *u)
8452	{
8453	get_stateid(cstate, stateid: &u->free_stateid.fr_stateid);
8454	}
8455
8456	void
8457	nfsd4_get_setattrstateid(struct nfsd4_compound_state *cstate,
8458	union nfsd4_op_u *u)
8459	{
8460	get_stateid(cstate, stateid: &u->setattr.sa_stateid);
8461	}
8462
8463	void
8464	nfsd4_get_closestateid(struct nfsd4_compound_state *cstate,
8465	union nfsd4_op_u *u)
8466	{
8467	get_stateid(cstate, stateid: &u->close.cl_stateid);
8468	}
8469
8470	void
8471	nfsd4_get_lockustateid(struct nfsd4_compound_state *cstate,
8472	union nfsd4_op_u *u)
8473	{
8474	get_stateid(cstate, stateid: &u->locku.lu_stateid);
8475	}
8476
8477	void
8478	nfsd4_get_readstateid(struct nfsd4_compound_state *cstate,
8479	union nfsd4_op_u *u)
8480	{
8481	get_stateid(cstate, stateid: &u->read.rd_stateid);
8482	}
8483
8484	void
8485	nfsd4_get_writestateid(struct nfsd4_compound_state *cstate,
8486	union nfsd4_op_u *u)
8487	{
8488	get_stateid(cstate, stateid: &u->write.wr_stateid);
8489	}
8490
8491	/**
8492	* nfsd4_deleg_getattr_conflict - Recall if GETATTR causes conflict
8493	* @rqstp: RPC transaction context
8494	* @inode: file to be checked for a conflict
8495	* @modified: return true if file was modified
8496	* @size: new size of file if modified is true
8497	*
8498	* This function is called when there is a conflict between a write
8499	* delegation and a change/size GETATTR from another client. The server
8500	* must either use the CB_GETATTR to get the current values of the
8501	* attributes from the client that holds the delegation or recall the
8502	* delegation before replying to the GETATTR. See RFC 8881 section
8503	* 18.7.4.
8504	*
8505	* Returns 0 if there is no conflict; otherwise an nfs_stat
8506	* code is returned.
8507	*/
8508	__be32
8509	nfsd4_deleg_getattr_conflict(struct svc_rqst *rqstp, struct inode *inode,
8510	bool *modified, u64 *size)
8511	{
8512	struct file_lock_context *ctx;
8513	struct nfs4_delegation *dp;
8514	struct nfs4_cb_fattr *ncf;
8515	struct file_lock *fl;
8516	struct iattr attrs;
8517	__be32 status;
8518
8519	might_sleep();
8520
8521	*modified = false;
8522	ctx = locks_inode_context(inode);
8523	if (!ctx)
8524	return 0;
8525	spin_lock(lock: &ctx->flc_lock);
8526	list_for_each_entry(fl, &ctx->flc_lease, fl_list) {
8527	if (fl->fl_flags == FL_LAYOUT)
8528	continue;
8529	if (fl->fl_lmops != &nfsd_lease_mng_ops) {
8530	/*
8531	* non-nfs lease, if it's a lease with F_RDLCK then
8532	* we are done; there isn't any write delegation
8533	* on this inode
8534	*/
8535	if (fl->fl_type == F_RDLCK)
8536	break;
8537	goto break_lease;
8538	}
8539	if (fl->fl_type == F_WRLCK) {
8540	dp = fl->fl_owner;
8541	if (dp->dl_recall.cb_clp == *(rqstp->rq_lease_breaker)) {
8542	spin_unlock(lock: &ctx->flc_lock);
8543	return 0;
8544	}
8545	break_lease:
8546	spin_unlock(lock: &ctx->flc_lock);
8547	nfsd_stats_wdeleg_getattr_inc();
8548
8549	dp = fl->fl_owner;
8550	ncf = &dp->dl_cb_fattr;
8551	nfs4_cb_getattr(ncf: &dp->dl_cb_fattr);
8552	wait_on_bit(word: &ncf->ncf_cb_flags, CB_GETATTR_BUSY, TASK_INTERRUPTIBLE);
8553	if (ncf->ncf_cb_status) {
8554	status = nfserrno(errno: nfsd_open_break_lease(inode, NFSD_MAY_READ));
8555	if (status != nfserr_jukebox ||
8556	!nfsd_wait_for_delegreturn(rqstp, inode))
8557	return status;
8558	}
8559	if (!ncf->ncf_file_modified &&
8560	(ncf->ncf_initial_cinfo != ncf->ncf_cb_change ||
8561	ncf->ncf_cur_fsize != ncf->ncf_cb_fsize))
8562	ncf->ncf_file_modified = true;
8563	if (ncf->ncf_file_modified) {
8564	/*
8565	* The server would not update the file's metadata
8566	* with the client's modified size.
8567	*/
8568	attrs.ia_mtime = attrs.ia_ctime = current_time(inode);
8569	attrs.ia_valid = ATTR_MTIME | ATTR_CTIME;
8570	setattr_copy(&nop_mnt_idmap, inode, attr: &attrs);
8571	mark_inode_dirty(inode);
8572	ncf->ncf_cur_fsize = ncf->ncf_cb_fsize;
8573	*size = ncf->ncf_cur_fsize;
8574	*modified = true;
8575	}
8576	return 0;
8577	}
8578	break;
8579	}
8580	spin_unlock(lock: &ctx->flc_lock);
8581	return 0;
8582	}
8583