1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* linux/fs/nfs/inode.c
4	*
5	* Copyright (C) 1992 Rick Sladkey
6	*
7	* nfs inode and superblock handling functions
8	*
9	* Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10	* experimental NFS changes. Modularisation taken straight from SYS5 fs.
11	*
12	* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13	* J.S.Peatfield@damtp.cam.ac.uk
14	*
15	*/
16
17	#include <linux/module.h>
18	#include <linux/init.h>
19	#include <linux/sched/signal.h>
20	#include <linux/time.h>
21	#include <linux/kernel.h>
22	#include <linux/mm.h>
23	#include <linux/string.h>
24	#include <linux/stat.h>
25	#include <linux/errno.h>
26	#include <linux/unistd.h>
27	#include <linux/sunrpc/clnt.h>
28	#include <linux/sunrpc/stats.h>
29	#include <linux/sunrpc/metrics.h>
30	#include <linux/nfs_fs.h>
31	#include <linux/nfs_mount.h>
32	#include <linux/nfs4_mount.h>
33	#include <linux/lockd/bind.h>
34	#include <linux/seq_file.h>
35	#include <linux/mount.h>
36	#include <linux/vfs.h>
37	#include <linux/inet.h>
38	#include <linux/nfs_xdr.h>
39	#include <linux/slab.h>
40	#include <linux/compat.h>
41	#include <linux/freezer.h>
42	#include <linux/uaccess.h>
43	#include <linux/iversion.h>
44
45	#include "nfs4_fs.h"
46	#include "callback.h"
47	#include "delegation.h"
48	#include "iostat.h"
49	#include "internal.h"
50	#include "fscache.h"
51	#include "pnfs.h"
52	#include "nfs.h"
53	#include "netns.h"
54	#include "sysfs.h"
55
56	#include "nfstrace.h"
57
58	#define NFSDBG_FACILITY NFSDBG_VFS
59
60	#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62	/* Default is to see 64-bit inode numbers */
63	static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65	static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67	static struct kmem_cache * nfs_inode_cachep;
68
69	static inline unsigned long
70	nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71	{
72	return nfs_fileid_to_ino_t(fileid: fattr->fileid);
73	}
74
75	int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
76	{
77	schedule();
78	if (signal_pending_state(state: mode, current))
79	return -ERESTARTSYS;
80	return 0;
81	}
82	EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
83
84	/**
85	* nfs_compat_user_ino64 - returns the user-visible inode number
86	* @fileid: 64-bit fileid
87	*
88	* This function returns a 32-bit inode number if the boot parameter
89	* nfs.enable_ino64 is zero.
90	*/
91	u64 nfs_compat_user_ino64(u64 fileid)
92	{
93	#ifdef CONFIG_COMPAT
94	compat_ulong_t ino;
95	#else
96	unsigned long ino;
97	#endif
98
99	if (enable_ino64)
100	return fileid;
101	ino = fileid;
102	if (sizeof(ino) < sizeof(fileid))
103	ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
104	return ino;
105	}
106
107	int nfs_drop_inode(struct inode *inode)
108	{
109	return NFS_STALE(inode) || generic_drop_inode(inode);
110	}
111	EXPORT_SYMBOL_GPL(nfs_drop_inode);
112
113	void nfs_clear_inode(struct inode *inode)
114	{
115	/*
116	* The following should never happen...
117	*/
118	WARN_ON_ONCE(nfs_have_writebacks(inode));
119	WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
120	nfs_zap_acl_cache(inode);
121	nfs_access_zap_cache(inode);
122	nfs_fscache_clear_inode(inode);
123	}
124	EXPORT_SYMBOL_GPL(nfs_clear_inode);
125
126	void nfs_evict_inode(struct inode *inode)
127	{
128	truncate_inode_pages_final(&inode->i_data);
129	clear_inode(inode);
130	nfs_clear_inode(inode);
131	}
132
133	int nfs_sync_inode(struct inode *inode)
134	{
135	inode_dio_wait(inode);
136	return nfs_wb_all(inode);
137	}
138	EXPORT_SYMBOL_GPL(nfs_sync_inode);
139
140	/**
141	* nfs_sync_mapping - helper to flush all mmapped dirty data to disk
142	* @mapping: pointer to struct address_space
143	*/
144	int nfs_sync_mapping(struct address_space *mapping)
145	{
146	int ret = 0;
147
148	if (mapping->nrpages != 0) {
149	unmap_mapping_range(mapping, holebegin: 0, holelen: 0, even_cows: 0);
150	ret = nfs_wb_all(inode: mapping->host);
151	}
152	return ret;
153	}
154
155	static int nfs_attribute_timeout(struct inode *inode)
156	{
157	struct nfs_inode *nfsi = NFS_I(inode);
158
159	return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
160	}
161
162	static bool nfs_check_cache_flags_invalid(struct inode *inode,
163	unsigned long flags)
164	{
165	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
166
167	return (cache_validity & flags) != 0;
168	}
169
170	bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
171	{
172	if (nfs_check_cache_flags_invalid(inode, flags))
173	return true;
174	return nfs_attribute_cache_expired(inode);
175	}
176	EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
177
178	#ifdef CONFIG_NFS_V4_2
179	static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
180	{
181	return nfsi->xattr_cache != NULL;
182	}
183	#else
184	static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
185	{
186	return false;
187	}
188	#endif
189
190	void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
191	{
192	struct nfs_inode *nfsi = NFS_I(inode);
193	bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
194
195	if (have_delegation) {
196	if (!(flags & NFS_INO_REVAL_FORCED))
197	flags &= ~(NFS_INO_INVALID_MODE |
198	NFS_INO_INVALID_OTHER |
199	NFS_INO_INVALID_XATTR);
200	flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
201	}
202
203	if (!nfs_has_xattr_cache(nfsi))
204	flags &= ~NFS_INO_INVALID_XATTR;
205	if (flags & NFS_INO_INVALID_DATA)
206	nfs_fscache_invalidate(inode, flags: 0);
207	flags &= ~NFS_INO_REVAL_FORCED;
208
209	nfsi->cache_validity |= flags;
210
211	if (inode->i_mapping->nrpages == 0) {
212	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
213	nfs_ooo_clear(nfsi);
214	} else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
215	nfs_ooo_clear(nfsi);
216	}
217	trace_nfs_set_cache_invalid(inode, error: 0);
218	}
219	EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
220
221	/*
222	* Invalidate the local caches
223	*/
224	static void nfs_zap_caches_locked(struct inode *inode)
225	{
226	struct nfs_inode *nfsi = NFS_I(inode);
227	int mode = inode->i_mode;
228
229	nfs_inc_stats(inode, stat: NFSIOS_ATTRINVALIDATE);
230
231	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
232	nfsi->attrtimeo_timestamp = jiffies;
233
234	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
235	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
236	NFS_INO_INVALID_DATA |
237	NFS_INO_INVALID_ACCESS |
238	NFS_INO_INVALID_ACL |
239	NFS_INO_INVALID_XATTR);
240	else
241	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
242	NFS_INO_INVALID_ACCESS |
243	NFS_INO_INVALID_ACL |
244	NFS_INO_INVALID_XATTR);
245	nfs_zap_label_cache_locked(nfsi);
246	}
247
248	void nfs_zap_caches(struct inode *inode)
249	{
250	spin_lock(lock: &inode->i_lock);
251	nfs_zap_caches_locked(inode);
252	spin_unlock(lock: &inode->i_lock);
253	}
254
255	void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
256	{
257	if (mapping->nrpages != 0) {
258	spin_lock(lock: &inode->i_lock);
259	nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
260	spin_unlock(lock: &inode->i_lock);
261	}
262	}
263
264	void nfs_zap_acl_cache(struct inode *inode)
265	{
266	void (*clear_acl_cache)(struct inode *);
267
268	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
269	if (clear_acl_cache != NULL)
270	clear_acl_cache(inode);
271	spin_lock(lock: &inode->i_lock);
272	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
273	spin_unlock(lock: &inode->i_lock);
274	}
275	EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
276
277	void nfs_invalidate_atime(struct inode *inode)
278	{
279	spin_lock(lock: &inode->i_lock);
280	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
281	spin_unlock(lock: &inode->i_lock);
282	}
283	EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
284
285	/*
286	* Invalidate, but do not unhash, the inode.
287	* NB: must be called with inode->i_lock held!
288	*/
289	static void nfs_set_inode_stale_locked(struct inode *inode)
290	{
291	set_bit(NFS_INO_STALE, addr: &NFS_I(inode)->flags);
292	nfs_zap_caches_locked(inode);
293	trace_nfs_set_inode_stale(inode);
294	}
295
296	void nfs_set_inode_stale(struct inode *inode)
297	{
298	spin_lock(lock: &inode->i_lock);
299	nfs_set_inode_stale_locked(inode);
300	spin_unlock(lock: &inode->i_lock);
301	}
302
303	struct nfs_find_desc {
304	struct nfs_fh *fh;
305	struct nfs_fattr *fattr;
306	};
307
308	/*
309	* In NFSv3 we can have 64bit inode numbers. In order to support
310	* this, and re-exported directories (also seen in NFSv2)
311	* we are forced to allow 2 different inodes to have the same
312	* i_ino.
313	*/
314	static int
315	nfs_find_actor(struct inode *inode, void *opaque)
316	{
317	struct nfs_find_desc *desc = opaque;
318	struct nfs_fh *fh = desc->fh;
319	struct nfs_fattr *fattr = desc->fattr;
320
321	if (NFS_FILEID(inode) != fattr->fileid)
322	return 0;
323	if (inode_wrong_type(inode, mode: fattr->mode))
324	return 0;
325	if (nfs_compare_fh(a: NFS_FH(inode), b: fh))
326	return 0;
327	if (is_bad_inode(inode) || NFS_STALE(inode))
328	return 0;
329	return 1;
330	}
331
332	static int
333	nfs_init_locked(struct inode *inode, void *opaque)
334	{
335	struct nfs_find_desc *desc = opaque;
336	struct nfs_fattr *fattr = desc->fattr;
337
338	set_nfs_fileid(inode, fileid: fattr->fileid);
339	inode->i_mode = fattr->mode;
340	nfs_copy_fh(target: NFS_FH(inode), source: desc->fh);
341	return 0;
342	}
343
344	#ifdef CONFIG_NFS_V4_SECURITY_LABEL
345	static void nfs_clear_label_invalid(struct inode *inode)
346	{
347	spin_lock(lock: &inode->i_lock);
348	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
349	spin_unlock(lock: &inode->i_lock);
350	}
351
352	void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
353	{
354	int error;
355
356	if (fattr->label == NULL)
357	return;
358
359	if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
360	error = security_inode_notifysecctx(inode, ctx: fattr->label->label,
361	ctxlen: fattr->label->len);
362	if (error)
363	printk(KERN_ERR "%s() %s %d "
364	"security_inode_notifysecctx() %d\n",
365	__func__,
366	(char *)fattr->label->label,
367	fattr->label->len, error);
368	nfs_clear_label_invalid(inode);
369	}
370	}
371
372	struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
373	{
374	struct nfs4_label *label;
375
376	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
377	return NULL;
378
379	label = kzalloc(size: sizeof(struct nfs4_label), flags);
380	if (label == NULL)
381	return ERR_PTR(error: -ENOMEM);
382
383	label->label = kzalloc(NFS4_MAXLABELLEN, flags);
384	if (label->label == NULL) {
385	kfree(objp: label);
386	return ERR_PTR(error: -ENOMEM);
387	}
388	label->len = NFS4_MAXLABELLEN;
389
390	return label;
391	}
392	EXPORT_SYMBOL_GPL(nfs4_label_alloc);
393	#else
394	void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
395	{
396	}
397	#endif
398	EXPORT_SYMBOL_GPL(nfs_setsecurity);
399
400	/* Search for inode identified by fh, fileid and i_mode in inode cache. */
401	struct inode *
402	nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
403	{
404	struct nfs_find_desc desc = {
405	.fh = fh,
406	.fattr = fattr,
407	};
408	struct inode *inode;
409	unsigned long hash;
410
411	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
412	!(fattr->valid & NFS_ATTR_FATTR_TYPE))
413	return NULL;
414
415	hash = nfs_fattr_to_ino_t(fattr);
416	inode = ilookup5(sb, hashval: hash, test: nfs_find_actor, data: &desc);
417
418	dprintk("%s: returning %p\n", __func__, inode);
419	return inode;
420	}
421
422	static void nfs_inode_init_regular(struct nfs_inode *nfsi)
423	{
424	atomic_long_set(v: &nfsi->nrequests, i: 0);
425	atomic_long_set(v: &nfsi->redirtied_pages, i: 0);
426	INIT_LIST_HEAD(list: &nfsi->commit_info.list);
427	atomic_long_set(v: &nfsi->commit_info.ncommit, i: 0);
428	atomic_set(v: &nfsi->commit_info.rpcs_out, i: 0);
429	mutex_init(&nfsi->commit_mutex);
430	}
431
432	static void nfs_inode_init_dir(struct nfs_inode *nfsi)
433	{
434	nfsi->cache_change_attribute = 0;
435	memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
436	init_rwsem(&nfsi->rmdir_sem);
437	}
438
439	/*
440	* This is our front-end to iget that looks up inodes by file handle
441	* instead of inode number.
442	*/
443	struct inode *
444	nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
445	{
446	struct nfs_find_desc desc = {
447	.fh = fh,
448	.fattr = fattr
449	};
450	struct inode *inode = ERR_PTR(error: -ENOENT);
451	u64 fattr_supported = NFS_SB(s: sb)->fattr_valid;
452	unsigned long hash;
453
454	nfs_attr_check_mountpoint(parent: sb, fattr);
455
456	if (nfs_attr_use_mounted_on_fileid(fattr))
457	fattr->fileid = fattr->mounted_on_fileid;
458	else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
459	goto out_no_inode;
460	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
461	goto out_no_inode;
462
463	hash = nfs_fattr_to_ino_t(fattr);
464
465	inode = iget5_locked(sb, hash, test: nfs_find_actor, set: nfs_init_locked, &desc);
466	if (inode == NULL) {
467	inode = ERR_PTR(error: -ENOMEM);
468	goto out_no_inode;
469	}
470
471	if (inode->i_state & I_NEW) {
472	struct nfs_inode *nfsi = NFS_I(inode);
473	unsigned long now = jiffies;
474
475	/* We set i_ino for the few things that still rely on it,
476	* such as stat(2) */
477	inode->i_ino = hash;
478
479	/* We can't support update_atime(), since the server will reset it */
480	inode->i_flags |= S_NOATIME|S_NOCMTIME;
481	inode->i_mode = fattr->mode;
482	nfsi->cache_validity = 0;
483	if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
484	&& (fattr_supported & NFS_ATTR_FATTR_MODE))
485	nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
486	/* Why so? Because we want revalidate for devices/FIFOs, and
487	* that's precisely what we have in nfs_file_inode_operations.
488	*/
489	inode->i_op = NFS_SB(s: sb)->nfs_client->rpc_ops->file_inode_ops;
490	if (S_ISREG(inode->i_mode)) {
491	inode->i_fop = NFS_SB(s: sb)->nfs_client->rpc_ops->file_ops;
492	inode->i_data.a_ops = &nfs_file_aops;
493	nfs_inode_init_regular(nfsi);
494	} else if (S_ISDIR(inode->i_mode)) {
495	inode->i_op = NFS_SB(s: sb)->nfs_client->rpc_ops->dir_inode_ops;
496	inode->i_fop = &nfs_dir_operations;
497	inode->i_data.a_ops = &nfs_dir_aops;
498	nfs_inode_init_dir(nfsi);
499	/* Deal with crossing mountpoints */
500	if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
501	fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
502	if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
503	inode->i_op = &nfs_referral_inode_operations;
504	else
505	inode->i_op = &nfs_mountpoint_inode_operations;
506	inode->i_fop = NULL;
507	inode->i_flags |= S_AUTOMOUNT;
508	}
509	} else if (S_ISLNK(inode->i_mode)) {
510	inode->i_op = &nfs_symlink_inode_operations;
511	inode_nohighmem(inode);
512	} else
513	init_special_inode(inode, inode->i_mode, fattr->rdev);
514
515	inode_set_atime(inode, sec: 0, nsec: 0);
516	inode_set_mtime(inode, sec: 0, nsec: 0);
517	inode_set_ctime(inode, sec: 0, nsec: 0);
518	inode_set_iversion_raw(inode, val: 0);
519	inode->i_size = 0;
520	clear_nlink(inode);
521	inode->i_uid = make_kuid(from: &init_user_ns, uid: -2);
522	inode->i_gid = make_kgid(from: &init_user_ns, gid: -2);
523	inode->i_blocks = 0;
524	nfsi->write_io = 0;
525	nfsi->read_io = 0;
526
527	nfsi->read_cache_jiffies = fattr->time_start;
528	nfsi->attr_gencount = fattr->gencount;
529	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
530	inode_set_atime_to_ts(inode, ts: fattr->atime);
531	else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
532	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
533	if (fattr->valid & NFS_ATTR_FATTR_MTIME)
534	inode_set_mtime_to_ts(inode, ts: fattr->mtime);
535	else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
536	nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
537	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
538	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
539	else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
540	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
541	if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
542	inode_set_iversion_raw(inode, val: fattr->change_attr);
543	else
544	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
545	if (fattr->valid & NFS_ATTR_FATTR_SIZE)
546	inode->i_size = nfs_size_to_loff_t(size: fattr->size);
547	else
548	nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
549	if (fattr->valid & NFS_ATTR_FATTR_NLINK)
550	set_nlink(inode, nlink: fattr->nlink);
551	else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
552	nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
553	if (fattr->valid & NFS_ATTR_FATTR_OWNER)
554	inode->i_uid = fattr->uid;
555	else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
556	nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
557	if (fattr->valid & NFS_ATTR_FATTR_GROUP)
558	inode->i_gid = fattr->gid;
559	else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
560	nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
561	if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
562	inode->i_blocks = fattr->du.nfs2.blocks;
563	else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
564	fattr->size != 0)
565	nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
566	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
567	/*
568	* report the blocks in 512byte units
569	*/
570	inode->i_blocks = nfs_calc_block_size(tsize: fattr->du.nfs3.used);
571	} else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
572	fattr->size != 0)
573	nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
574
575	nfs_setsecurity(inode, fattr);
576
577	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
578	nfsi->attrtimeo_timestamp = now;
579	nfsi->access_cache = RB_ROOT;
580
581	nfs_fscache_init_inode(inode);
582
583	unlock_new_inode(inode);
584	} else {
585	int err = nfs_refresh_inode(inode, fattr);
586	if (err < 0) {
587	iput(inode);
588	inode = ERR_PTR(error: err);
589	goto out_no_inode;
590	}
591	}
592	dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
593	inode->i_sb->s_id,
594	(unsigned long long)NFS_FILEID(inode),
595	nfs_display_fhandle_hash(fh),
596	atomic_read(&inode->i_count));
597
598	out:
599	return inode;
600
601	out_no_inode:
602	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
603	goto out;
604	}
605	EXPORT_SYMBOL_GPL(nfs_fhget);
606
607	#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
608
609	int
610	nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
611	struct iattr *attr)
612	{
613	struct inode *inode = d_inode(dentry);
614	struct nfs_fattr *fattr;
615	int error = 0;
616
617	nfs_inc_stats(inode, stat: NFSIOS_VFSSETATTR);
618
619	/* skip mode change if it's just for clearing setuid/setgid */
620	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
621	attr->ia_valid &= ~ATTR_MODE;
622
623	if (attr->ia_valid & ATTR_SIZE) {
624	BUG_ON(!S_ISREG(inode->i_mode));
625
626	error = inode_newsize_ok(inode, offset: attr->ia_size);
627	if (error)
628	return error;
629
630	if (attr->ia_size == i_size_read(inode))
631	attr->ia_valid &= ~ATTR_SIZE;
632	}
633
634	/* Optimization: if the end result is no change, don't RPC */
635	if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
636	return 0;
637
638	trace_nfs_setattr_enter(inode);
639
640	/* Write all dirty data */
641	if (S_ISREG(inode->i_mode))
642	nfs_sync_inode(inode);
643
644	fattr = nfs_alloc_fattr_with_label(server: NFS_SERVER(inode));
645	if (fattr == NULL) {
646	error = -ENOMEM;
647	goto out;
648	}
649
650	error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
651	if (error == 0)
652	error = nfs_refresh_inode(inode, fattr);
653	nfs_free_fattr(fattr);
654	out:
655	trace_nfs_setattr_exit(inode, error);
656	return error;
657	}
658	EXPORT_SYMBOL_GPL(nfs_setattr);
659
660	/**
661	* nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
662	* @inode: inode of the file used
663	* @offset: file offset to start truncating
664	*
665	* This is a copy of the common vmtruncate, but with the locking
666	* corrected to take into account the fact that NFS requires
667	* inode->i_size to be updated under the inode->i_lock.
668	* Note: must be called with inode->i_lock held!
669	*/
670	static int nfs_vmtruncate(struct inode * inode, loff_t offset)
671	{
672	int err;
673
674	err = inode_newsize_ok(inode, offset);
675	if (err)
676	goto out;
677
678	trace_nfs_size_truncate(inode, new_size: offset);
679	i_size_write(inode, i_size: offset);
680	/* Optimisation */
681	if (offset == 0) {
682	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
683	nfs_ooo_clear(nfsi: NFS_I(inode));
684	}
685	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
686
687	spin_unlock(lock: &inode->i_lock);
688	truncate_pagecache(inode, new: offset);
689	spin_lock(lock: &inode->i_lock);
690	out:
691	return err;
692	}
693
694	/**
695	* nfs_setattr_update_inode - Update inode metadata after a setattr call.
696	* @inode: pointer to struct inode
697	* @attr: pointer to struct iattr
698	* @fattr: pointer to struct nfs_fattr
699	*
700	* Note: we do this in the *proc.c in order to ensure that
701	* it works for things like exclusive creates too.
702	*/
703	void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
704	struct nfs_fattr *fattr)
705	{
706	/* Barrier: bump the attribute generation count. */
707	nfs_fattr_set_barrier(fattr);
708
709	spin_lock(lock: &inode->i_lock);
710	NFS_I(inode)->attr_gencount = fattr->gencount;
711	if ((attr->ia_valid & ATTR_SIZE) != 0) {
712	nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
713	NFS_INO_INVALID_BLOCKS);
714	nfs_inc_stats(inode, stat: NFSIOS_SETATTRTRUNC);
715	nfs_vmtruncate(inode, offset: attr->ia_size);
716	}
717	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
718	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
719	if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
720	inode->i_mode & S_ISUID)
721	inode->i_mode &= ~S_ISUID;
722	if (setattr_should_drop_sgid(idmap: &nop_mnt_idmap, inode))
723	inode->i_mode &= ~S_ISGID;
724	if ((attr->ia_valid & ATTR_MODE) != 0) {
725	int mode = attr->ia_mode & S_IALLUGO;
726	mode |= inode->i_mode & ~S_IALLUGO;
727	inode->i_mode = mode;
728	}
729	if ((attr->ia_valid & ATTR_UID) != 0)
730	inode->i_uid = attr->ia_uid;
731	if ((attr->ia_valid & ATTR_GID) != 0)
732	inode->i_gid = attr->ia_gid;
733	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
734	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
735	else
736	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
737	| NFS_INO_INVALID_CTIME);
738	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
739	| NFS_INO_INVALID_ACL);
740	}
741	if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
742	NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
743	| NFS_INO_INVALID_CTIME);
744	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
745	inode_set_atime_to_ts(inode, ts: fattr->atime);
746	else if (attr->ia_valid & ATTR_ATIME_SET)
747	inode_set_atime_to_ts(inode, ts: attr->ia_atime);
748	else
749	nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
750
751	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
752	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
753	else
754	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
755	| NFS_INO_INVALID_CTIME);
756	}
757	if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
758	NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
759	| NFS_INO_INVALID_CTIME);
760	if (fattr->valid & NFS_ATTR_FATTR_MTIME)
761	inode_set_mtime_to_ts(inode, ts: fattr->mtime);
762	else if (attr->ia_valid & ATTR_MTIME_SET)
763	inode_set_mtime_to_ts(inode, ts: attr->ia_mtime);
764	else
765	nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
766
767	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
768	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
769	else
770	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
771	| NFS_INO_INVALID_CTIME);
772	}
773	if (fattr->valid)
774	nfs_update_inode(inode, fattr);
775	spin_unlock(lock: &inode->i_lock);
776	}
777	EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
778
779	/*
780	* Don't request help from readdirplus if the file is being written to,
781	* or if attribute caching is turned off
782	*/
783	static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
784	{
785	return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
786	!nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
787	}
788
789	static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
790	{
791	if (!IS_ROOT(dentry)) {
792	struct dentry *parent = dget_parent(dentry);
793	nfs_readdir_record_entry_cache_miss(dir: d_inode(dentry: parent));
794	dput(parent);
795	}
796	}
797
798	static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
799	{
800	if (!IS_ROOT(dentry)) {
801	struct dentry *parent = dget_parent(dentry);
802	nfs_readdir_record_entry_cache_hit(dir: d_inode(dentry: parent));
803	dput(parent);
804	}
805	}
806
807	static u32 nfs_get_valid_attrmask(struct inode *inode)
808	{
809	unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
810	u32 reply_mask = STATX_INO | STATX_TYPE;
811
812	if (!(cache_validity & NFS_INO_INVALID_ATIME))
813	reply_mask |= STATX_ATIME;
814	if (!(cache_validity & NFS_INO_INVALID_CTIME))
815	reply_mask |= STATX_CTIME;
816	if (!(cache_validity & NFS_INO_INVALID_MTIME))
817	reply_mask |= STATX_MTIME;
818	if (!(cache_validity & NFS_INO_INVALID_SIZE))
819	reply_mask |= STATX_SIZE;
820	if (!(cache_validity & NFS_INO_INVALID_NLINK))
821	reply_mask |= STATX_NLINK;
822	if (!(cache_validity & NFS_INO_INVALID_MODE))
823	reply_mask |= STATX_MODE;
824	if (!(cache_validity & NFS_INO_INVALID_OTHER))
825	reply_mask |= STATX_UID | STATX_GID;
826	if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
827	reply_mask |= STATX_BLOCKS;
828	if (!(cache_validity & NFS_INO_INVALID_CHANGE))
829	reply_mask |= STATX_CHANGE_COOKIE;
830	return reply_mask;
831	}
832
833	int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
834	struct kstat *stat, u32 request_mask, unsigned int query_flags)
835	{
836	struct inode *inode = d_inode(dentry: path->dentry);
837	struct nfs_server *server = NFS_SERVER(inode);
838	unsigned long cache_validity;
839	int err = 0;
840	bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
841	bool do_update = false;
842	bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
843
844	trace_nfs_getattr_enter(inode);
845
846	request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
847	STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
848	STATX_INO | STATX_SIZE | STATX_BLOCKS |
849	STATX_CHANGE_COOKIE;
850
851	if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
852	if (readdirplus_enabled)
853	nfs_readdirplus_parent_cache_hit(dentry: path->dentry);
854	goto out_no_revalidate;
855	}
856
857	/* Flush out writes to the server in order to update c/mtime/version. */
858	if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
859	S_ISREG(inode->i_mode))
860	filemap_write_and_wait(mapping: inode->i_mapping);
861
862	/*
863	* We may force a getattr if the user cares about atime.
864	*
865	* Note that we only have to check the vfsmount flags here:
866	* - NFS always sets S_NOATIME by so checking it would give a
867	* bogus result
868	* - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
869	* no point in checking those.
870	*/
871	if ((path->mnt->mnt_flags & MNT_NOATIME) ||
872	((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
873	request_mask &= ~STATX_ATIME;
874
875	/* Is the user requesting attributes that might need revalidation? */
876	if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
877	STATX_MTIME|STATX_UID|STATX_GID|
878	STATX_SIZE|STATX_BLOCKS|
879	STATX_CHANGE_COOKIE)))
880	goto out_no_revalidate;
881
882	/* Check whether the cached attributes are stale */
883	do_update |= force_sync || nfs_attribute_cache_expired(inode);
884	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
885	do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
886	if (request_mask & STATX_ATIME)
887	do_update |= cache_validity & NFS_INO_INVALID_ATIME;
888	if (request_mask & STATX_CTIME)
889	do_update |= cache_validity & NFS_INO_INVALID_CTIME;
890	if (request_mask & STATX_MTIME)
891	do_update |= cache_validity & NFS_INO_INVALID_MTIME;
892	if (request_mask & STATX_SIZE)
893	do_update |= cache_validity & NFS_INO_INVALID_SIZE;
894	if (request_mask & STATX_NLINK)
895	do_update |= cache_validity & NFS_INO_INVALID_NLINK;
896	if (request_mask & STATX_MODE)
897	do_update |= cache_validity & NFS_INO_INVALID_MODE;
898	if (request_mask & (STATX_UID | STATX_GID))
899	do_update |= cache_validity & NFS_INO_INVALID_OTHER;
900	if (request_mask & STATX_BLOCKS)
901	do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
902
903	if (do_update) {
904	if (readdirplus_enabled)
905	nfs_readdirplus_parent_cache_miss(dentry: path->dentry);
906	err = __nfs_revalidate_inode(server, inode);
907	if (err)
908	goto out;
909	} else if (readdirplus_enabled)
910	nfs_readdirplus_parent_cache_hit(dentry: path->dentry);
911	out_no_revalidate:
912	/* Only return attributes that were revalidated. */
913	stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
914
915	generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
916	stat->ino = nfs_compat_user_ino64(fileid: NFS_FILEID(inode));
917	stat->change_cookie = inode_peek_iversion_raw(inode);
918	stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
919	if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
920	stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
921	if (S_ISDIR(inode->i_mode))
922	stat->blksize = NFS_SERVER(inode)->dtsize;
923	out:
924	trace_nfs_getattr_exit(inode, error: err);
925	return err;
926	}
927	EXPORT_SYMBOL_GPL(nfs_getattr);
928
929	static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
930	{
931	refcount_set(r: &l_ctx->count, n: 1);
932	l_ctx->lockowner = current->files;
933	INIT_LIST_HEAD(list: &l_ctx->list);
934	atomic_set(v: &l_ctx->io_count, i: 0);
935	}
936
937	static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
938	{
939	struct nfs_lock_context *pos;
940
941	list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
942	if (pos->lockowner != current->files)
943	continue;
944	if (refcount_inc_not_zero(r: &pos->count))
945	return pos;
946	}
947	return NULL;
948	}
949
950	struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
951	{
952	struct nfs_lock_context *res, *new = NULL;
953	struct inode *inode = d_inode(dentry: ctx->dentry);
954
955	rcu_read_lock();
956	res = __nfs_find_lock_context(ctx);
957	rcu_read_unlock();
958	if (res == NULL) {
959	new = kmalloc(size: sizeof(*new), GFP_KERNEL_ACCOUNT);
960	if (new == NULL)
961	return ERR_PTR(error: -ENOMEM);
962	nfs_init_lock_context(l_ctx: new);
963	spin_lock(lock: &inode->i_lock);
964	res = __nfs_find_lock_context(ctx);
965	if (res == NULL) {
966	new->open_context = get_nfs_open_context(ctx);
967	if (new->open_context) {
968	list_add_tail_rcu(new: &new->list,
969	head: &ctx->lock_context.list);
970	res = new;
971	new = NULL;
972	} else
973	res = ERR_PTR(error: -EBADF);
974	}
975	spin_unlock(lock: &inode->i_lock);
976	kfree(objp: new);
977	}
978	return res;
979	}
980	EXPORT_SYMBOL_GPL(nfs_get_lock_context);
981
982	void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
983	{
984	struct nfs_open_context *ctx = l_ctx->open_context;
985	struct inode *inode = d_inode(dentry: ctx->dentry);
986
987	if (!refcount_dec_and_lock(r: &l_ctx->count, lock: &inode->i_lock))
988	return;
989	list_del_rcu(entry: &l_ctx->list);
990	spin_unlock(lock: &inode->i_lock);
991	put_nfs_open_context(ctx);
992	kfree_rcu(l_ctx, rcu_head);
993	}
994	EXPORT_SYMBOL_GPL(nfs_put_lock_context);
995
996	/**
997	* nfs_close_context - Common close_context() routine NFSv2/v3
998	* @ctx: pointer to context
999	* @is_sync: is this a synchronous close
1000	*
1001	* Ensure that the attributes are up to date if we're mounted
1002	* with close-to-open semantics and we have cached data that will
1003	* need to be revalidated on open.
1004	*/
1005	void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
1006	{
1007	struct nfs_inode *nfsi;
1008	struct inode *inode;
1009
1010	if (!(ctx->mode & FMODE_WRITE))
1011	return;
1012	if (!is_sync)
1013	return;
1014	inode = d_inode(dentry: ctx->dentry);
1015	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1016	return;
1017	nfsi = NFS_I(inode);
1018	if (inode->i_mapping->nrpages == 0)
1019	return;
1020	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1021	return;
1022	if (!list_empty(head: &nfsi->open_files))
1023	return;
1024	if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1025	return;
1026	nfs_revalidate_inode(inode,
1027	NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1028	}
1029	EXPORT_SYMBOL_GPL(nfs_close_context);
1030
1031	struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1032	fmode_t f_mode,
1033	struct file *filp)
1034	{
1035	struct nfs_open_context *ctx;
1036
1037	ctx = kmalloc(size: sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1038	if (!ctx)
1039	return ERR_PTR(error: -ENOMEM);
1040	nfs_sb_active(sb: dentry->d_sb);
1041	ctx->dentry = dget(dentry);
1042	if (filp)
1043	ctx->cred = get_cred(cred: filp->f_cred);
1044	else
1045	ctx->cred = get_current_cred();
1046	rcu_assign_pointer(ctx->ll_cred, NULL);
1047	ctx->state = NULL;
1048	ctx->mode = f_mode;
1049	ctx->flags = 0;
1050	ctx->error = 0;
1051	ctx->flock_owner = (fl_owner_t)filp;
1052	nfs_init_lock_context(l_ctx: &ctx->lock_context);
1053	ctx->lock_context.open_context = ctx;
1054	INIT_LIST_HEAD(list: &ctx->list);
1055	ctx->mdsthreshold = NULL;
1056	return ctx;
1057	}
1058	EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1059
1060	struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1061	{
1062	if (ctx != NULL && refcount_inc_not_zero(r: &ctx->lock_context.count))
1063	return ctx;
1064	return NULL;
1065	}
1066	EXPORT_SYMBOL_GPL(get_nfs_open_context);
1067
1068	static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1069	{
1070	struct inode *inode = d_inode(dentry: ctx->dentry);
1071	struct super_block *sb = ctx->dentry->d_sb;
1072
1073	if (!refcount_dec_and_test(r: &ctx->lock_context.count))
1074	return;
1075	if (!list_empty(head: &ctx->list)) {
1076	spin_lock(lock: &inode->i_lock);
1077	list_del_rcu(entry: &ctx->list);
1078	spin_unlock(lock: &inode->i_lock);
1079	}
1080	if (inode != NULL)
1081	NFS_PROTO(inode)->close_context(ctx, is_sync);
1082	put_cred(cred: ctx->cred);
1083	dput(ctx->dentry);
1084	nfs_sb_deactive(sb);
1085	put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1086	kfree(objp: ctx->mdsthreshold);
1087	kfree_rcu(ctx, rcu_head);
1088	}
1089
1090	void put_nfs_open_context(struct nfs_open_context *ctx)
1091	{
1092	__put_nfs_open_context(ctx, is_sync: 0);
1093	}
1094	EXPORT_SYMBOL_GPL(put_nfs_open_context);
1095
1096	static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1097	{
1098	__put_nfs_open_context(ctx, is_sync: 1);
1099	}
1100
1101	/*
1102	* Ensure that mmap has a recent RPC credential for use when writing out
1103	* shared pages
1104	*/
1105	void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1106	{
1107	struct inode *inode = d_inode(dentry: ctx->dentry);
1108	struct nfs_inode *nfsi = NFS_I(inode);
1109
1110	spin_lock(lock: &inode->i_lock);
1111	if (list_empty(head: &nfsi->open_files) &&
1112	nfs_ooo_test(nfsi))
1113	nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1114	NFS_INO_REVAL_FORCED);
1115	list_add_tail_rcu(new: &ctx->list, head: &nfsi->open_files);
1116	spin_unlock(lock: &inode->i_lock);
1117	}
1118	EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1119
1120	void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1121	{
1122	filp->private_data = get_nfs_open_context(ctx);
1123	set_bit(NFS_CONTEXT_FILE_OPEN, addr: &ctx->flags);
1124	if (list_empty(head: &ctx->list))
1125	nfs_inode_attach_open_context(ctx);
1126	}
1127	EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1128
1129	/*
1130	* Given an inode, search for an open context with the desired characteristics
1131	*/
1132	struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1133	{
1134	struct nfs_inode *nfsi = NFS_I(inode);
1135	struct nfs_open_context *pos, *ctx = NULL;
1136
1137	rcu_read_lock();
1138	list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1139	if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1140	continue;
1141	if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1142	continue;
1143	if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1144	continue;
1145	ctx = get_nfs_open_context(pos);
1146	if (ctx)
1147	break;
1148	}
1149	rcu_read_unlock();
1150	return ctx;
1151	}
1152
1153	void nfs_file_clear_open_context(struct file *filp)
1154	{
1155	struct nfs_open_context *ctx = nfs_file_open_context(filp);
1156
1157	if (ctx) {
1158	struct inode *inode = d_inode(dentry: ctx->dentry);
1159
1160	clear_bit(NFS_CONTEXT_FILE_OPEN, addr: &ctx->flags);
1161	/*
1162	* We fatal error on write before. Try to writeback
1163	* every page again.
1164	*/
1165	if (ctx->error < 0)
1166	invalidate_inode_pages2(mapping: inode->i_mapping);
1167	filp->private_data = NULL;
1168	put_nfs_open_context_sync(ctx);
1169	}
1170	}
1171
1172	/*
1173	* These allocate and release file read/write context information.
1174	*/
1175	int nfs_open(struct inode *inode, struct file *filp)
1176	{
1177	struct nfs_open_context *ctx;
1178
1179	ctx = alloc_nfs_open_context(file_dentry(file: filp),
1180	flags_to_mode(flags: filp->f_flags), filp);
1181	if (IS_ERR(ptr: ctx))
1182	return PTR_ERR(ptr: ctx);
1183	nfs_file_set_open_context(filp, ctx);
1184	put_nfs_open_context(ctx);
1185	nfs_fscache_open_file(inode, filp);
1186	return 0;
1187	}
1188
1189	/*
1190	* This function is called whenever some part of NFS notices that
1191	* the cached attributes have to be refreshed.
1192	*/
1193	int
1194	__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1195	{
1196	int status = -ESTALE;
1197	struct nfs_fattr *fattr = NULL;
1198	struct nfs_inode *nfsi = NFS_I(inode);
1199
1200	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1201	inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1202
1203	trace_nfs_revalidate_inode_enter(inode);
1204
1205	if (is_bad_inode(inode))
1206	goto out;
1207	if (NFS_STALE(inode))
1208	goto out;
1209
1210	/* pNFS: Attributes aren't updated until we layoutcommit */
1211	if (S_ISREG(inode->i_mode)) {
1212	status = pnfs_sync_inode(inode, datasync: false);
1213	if (status)
1214	goto out;
1215	}
1216
1217	status = -ENOMEM;
1218	fattr = nfs_alloc_fattr_with_label(server: NFS_SERVER(inode));
1219	if (fattr == NULL)
1220	goto out;
1221
1222	nfs_inc_stats(inode, stat: NFSIOS_INODEREVALIDATE);
1223
1224	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1225	if (status != 0) {
1226	dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1227	inode->i_sb->s_id,
1228	(unsigned long long)NFS_FILEID(inode), status);
1229	switch (status) {
1230	case -ETIMEDOUT:
1231	/* A soft timeout occurred. Use cached information? */
1232	if (server->flags & NFS_MOUNT_SOFTREVAL)
1233	status = 0;
1234	break;
1235	case -ESTALE:
1236	if (!S_ISDIR(inode->i_mode))
1237	nfs_set_inode_stale(inode);
1238	else
1239	nfs_zap_caches(inode);
1240	}
1241	goto out;
1242	}
1243
1244	status = nfs_refresh_inode(inode, fattr);
1245	if (status) {
1246	dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1247	inode->i_sb->s_id,
1248	(unsigned long long)NFS_FILEID(inode), status);
1249	goto out;
1250	}
1251
1252	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1253	nfs_zap_acl_cache(inode);
1254
1255	nfs_setsecurity(inode, fattr);
1256
1257	dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1258	inode->i_sb->s_id,
1259	(unsigned long long)NFS_FILEID(inode));
1260
1261	out:
1262	nfs_free_fattr(fattr);
1263	trace_nfs_revalidate_inode_exit(inode, error: status);
1264	return status;
1265	}
1266
1267	int nfs_attribute_cache_expired(struct inode *inode)
1268	{
1269	if (nfs_have_delegated_attributes(inode))
1270	return 0;
1271	return nfs_attribute_timeout(inode);
1272	}
1273
1274	/**
1275	* nfs_revalidate_inode - Revalidate the inode attributes
1276	* @inode: pointer to inode struct
1277	* @flags: cache flags to check
1278	*
1279	* Updates inode attribute information by retrieving the data from the server.
1280	*/
1281	int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1282	{
1283	if (!nfs_check_cache_invalid(inode, flags))
1284	return NFS_STALE(inode) ? -ESTALE : 0;
1285	return __nfs_revalidate_inode(server: NFS_SERVER(inode), inode);
1286	}
1287	EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1288
1289	static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1290	{
1291	int ret;
1292
1293	nfs_fscache_invalidate(inode, flags: 0);
1294	if (mapping->nrpages != 0) {
1295	if (S_ISREG(inode->i_mode)) {
1296	ret = nfs_sync_mapping(mapping);
1297	if (ret < 0)
1298	return ret;
1299	}
1300	ret = invalidate_inode_pages2(mapping);
1301	if (ret < 0)
1302	return ret;
1303	}
1304	nfs_inc_stats(inode, stat: NFSIOS_DATAINVALIDATE);
1305
1306	dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1307	inode->i_sb->s_id,
1308	(unsigned long long)NFS_FILEID(inode));
1309	return 0;
1310	}
1311
1312	/**
1313	* nfs_clear_invalid_mapping - Conditionally clear a mapping
1314	* @mapping: pointer to mapping
1315	*
1316	* If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1317	*/
1318	int nfs_clear_invalid_mapping(struct address_space *mapping)
1319	{
1320	struct inode *inode = mapping->host;
1321	struct nfs_inode *nfsi = NFS_I(inode);
1322	unsigned long *bitlock = &nfsi->flags;
1323	int ret = 0;
1324
1325	/*
1326	* We must clear NFS_INO_INVALID_DATA first to ensure that
1327	* invalidations that come in while we're shooting down the mappings
1328	* are respected. But, that leaves a race window where one revalidator
1329	* can clear the flag, and then another checks it before the mapping
1330	* gets invalidated. Fix that by serializing access to this part of
1331	* the function.
1332	*
1333	* At the same time, we need to allow other tasks to see whether we
1334	* might be in the middle of invalidating the pages, so we only set
1335	* the bit lock here if it looks like we're going to be doing that.
1336	*/
1337	for (;;) {
1338	ret = wait_on_bit_action(word: bitlock, NFS_INO_INVALIDATING,
1339	action: nfs_wait_bit_killable,
1340	TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1341	if (ret)
1342	goto out;
1343	spin_lock(lock: &inode->i_lock);
1344	if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1345	spin_unlock(lock: &inode->i_lock);
1346	continue;
1347	}
1348	if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1349	break;
1350	spin_unlock(lock: &inode->i_lock);
1351	goto out;
1352	}
1353
1354	set_bit(NFS_INO_INVALIDATING, addr: bitlock);
1355	smp_wmb();
1356	nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1357	nfs_ooo_clear(nfsi);
1358	spin_unlock(lock: &inode->i_lock);
1359	trace_nfs_invalidate_mapping_enter(inode);
1360	ret = nfs_invalidate_mapping(inode, mapping);
1361	trace_nfs_invalidate_mapping_exit(inode, error: ret);
1362
1363	clear_bit_unlock(NFS_INO_INVALIDATING, addr: bitlock);
1364	smp_mb__after_atomic();
1365	wake_up_bit(word: bitlock, NFS_INO_INVALIDATING);
1366	out:
1367	return ret;
1368	}
1369
1370	bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1371	{
1372	return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1373	NFS_STALE(inode);
1374	}
1375
1376	int nfs_revalidate_mapping_rcu(struct inode *inode)
1377	{
1378	struct nfs_inode *nfsi = NFS_I(inode);
1379	unsigned long *bitlock = &nfsi->flags;
1380	int ret = 0;
1381
1382	if (IS_SWAPFILE(inode))
1383	goto out;
1384	if (nfs_mapping_need_revalidate_inode(inode)) {
1385	ret = -ECHILD;
1386	goto out;
1387	}
1388	spin_lock(lock: &inode->i_lock);
1389	if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1390	(nfsi->cache_validity & NFS_INO_INVALID_DATA))
1391	ret = -ECHILD;
1392	spin_unlock(lock: &inode->i_lock);
1393	out:
1394	return ret;
1395	}
1396
1397	/**
1398	* nfs_revalidate_mapping - Revalidate the pagecache
1399	* @inode: pointer to host inode
1400	* @mapping: pointer to mapping
1401	*/
1402	int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1403	{
1404	/* swapfiles are not supposed to be shared. */
1405	if (IS_SWAPFILE(inode))
1406	return 0;
1407
1408	if (nfs_mapping_need_revalidate_inode(inode)) {
1409	int ret = __nfs_revalidate_inode(server: NFS_SERVER(inode), inode);
1410	if (ret < 0)
1411	return ret;
1412	}
1413
1414	return nfs_clear_invalid_mapping(mapping);
1415	}
1416
1417	static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1418	{
1419	struct inode *inode = &nfsi->vfs_inode;
1420
1421	if (!S_ISREG(inode->i_mode))
1422	return false;
1423	if (list_empty(head: &nfsi->open_files))
1424	return false;
1425	return inode_is_open_for_write(inode);
1426	}
1427
1428	static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1429	{
1430	return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1431	}
1432
1433	static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1434	{
1435	struct timespec64 ts;
1436
1437	if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1438	&& (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1439	&& inode_eq_iversion_raw(inode, old: fattr->pre_change_attr)) {
1440	inode_set_iversion_raw(inode, val: fattr->change_attr);
1441	if (S_ISDIR(inode->i_mode))
1442	nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1443	else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1444	nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1445	}
1446	/* If we have atomic WCC data, we may update some attributes */
1447	ts = inode_get_ctime(inode);
1448	if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1449	&& (fattr->valid & NFS_ATTR_FATTR_CTIME)
1450	&& timespec64_equal(a: &ts, b: &fattr->pre_ctime)) {
1451	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
1452	}
1453
1454	ts = inode_get_mtime(inode);
1455	if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1456	&& (fattr->valid & NFS_ATTR_FATTR_MTIME)
1457	&& timespec64_equal(a: &ts, b: &fattr->pre_mtime)) {
1458	inode_set_mtime_to_ts(inode, ts: fattr->mtime);
1459	}
1460	if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1461	&& (fattr->valid & NFS_ATTR_FATTR_SIZE)
1462	&& i_size_read(inode) == nfs_size_to_loff_t(size: fattr->pre_size)
1463	&& !nfs_have_writebacks(inode)) {
1464	trace_nfs_size_wcc(inode, new_size: fattr->size);
1465	i_size_write(inode, i_size: nfs_size_to_loff_t(size: fattr->size));
1466	}
1467	}
1468
1469	/**
1470	* nfs_check_inode_attributes - verify consistency of the inode attribute cache
1471	* @inode: pointer to inode
1472	* @fattr: updated attributes
1473	*
1474	* Verifies the attribute cache. If we have just changed the attributes,
1475	* so that fattr carries weak cache consistency data, then it may
1476	* also update the ctime/mtime/change_attribute.
1477	*/
1478	static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1479	{
1480	struct nfs_inode *nfsi = NFS_I(inode);
1481	loff_t cur_size, new_isize;
1482	unsigned long invalid = 0;
1483	struct timespec64 ts;
1484
1485	if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1486	return 0;
1487
1488	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1489	/* Only a mounted-on-fileid? Just exit */
1490	if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1491	return 0;
1492	/* Has the inode gone and changed behind our back? */
1493	} else if (nfsi->fileid != fattr->fileid) {
1494	/* Is this perhaps the mounted-on fileid? */
1495	if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1496	nfsi->fileid == fattr->mounted_on_fileid)
1497	return 0;
1498	return -ESTALE;
1499	}
1500	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, mode: fattr->mode))
1501	return -ESTALE;
1502
1503
1504	if (!nfs_file_has_buffered_writers(nfsi)) {
1505	/* Verify a few of the more important attributes */
1506	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, old: fattr->change_attr))
1507	invalid |= NFS_INO_INVALID_CHANGE;
1508
1509	ts = inode_get_mtime(inode);
1510	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(a: &ts, b: &fattr->mtime))
1511	invalid |= NFS_INO_INVALID_MTIME;
1512
1513	ts = inode_get_ctime(inode);
1514	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(a: &ts, b: &fattr->ctime))
1515	invalid |= NFS_INO_INVALID_CTIME;
1516
1517	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1518	cur_size = i_size_read(inode);
1519	new_isize = nfs_size_to_loff_t(size: fattr->size);
1520	if (cur_size != new_isize)
1521	invalid |= NFS_INO_INVALID_SIZE;
1522	}
1523	}
1524
1525	/* Have any file permissions changed? */
1526	if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1527	invalid |= NFS_INO_INVALID_MODE;
1528	if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(left: inode->i_uid, right: fattr->uid))
1529	invalid |= NFS_INO_INVALID_OTHER;
1530	if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(left: inode->i_gid, right: fattr->gid))
1531	invalid |= NFS_INO_INVALID_OTHER;
1532
1533	/* Has the link count changed? */
1534	if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1535	invalid |= NFS_INO_INVALID_NLINK;
1536
1537	ts = inode_get_atime(inode);
1538	if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(a: &ts, b: &fattr->atime))
1539	invalid |= NFS_INO_INVALID_ATIME;
1540
1541	if (invalid != 0)
1542	nfs_set_cache_invalid(inode, invalid);
1543
1544	nfsi->read_cache_jiffies = fattr->time_start;
1545	return 0;
1546	}
1547
1548	static atomic_long_t nfs_attr_generation_counter;
1549
1550	static unsigned long nfs_read_attr_generation_counter(void)
1551	{
1552	return atomic_long_read(v: &nfs_attr_generation_counter);
1553	}
1554
1555	unsigned long nfs_inc_attr_generation_counter(void)
1556	{
1557	return atomic_long_inc_return(v: &nfs_attr_generation_counter);
1558	}
1559	EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1560
1561	void nfs_fattr_init(struct nfs_fattr *fattr)
1562	{
1563	fattr->valid = 0;
1564	fattr->time_start = jiffies;
1565	fattr->gencount = nfs_inc_attr_generation_counter();
1566	fattr->owner_name = NULL;
1567	fattr->group_name = NULL;
1568	}
1569	EXPORT_SYMBOL_GPL(nfs_fattr_init);
1570
1571	/**
1572	* nfs_fattr_set_barrier
1573	* @fattr: attributes
1574	*
1575	* Used to set a barrier after an attribute was updated. This
1576	* barrier ensures that older attributes from RPC calls that may
1577	* have raced with our update cannot clobber these new values.
1578	* Note that you are still responsible for ensuring that other
1579	* operations which change the attribute on the server do not
1580	* collide.
1581	*/
1582	void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1583	{
1584	fattr->gencount = nfs_inc_attr_generation_counter();
1585	}
1586
1587	struct nfs_fattr *nfs_alloc_fattr(void)
1588	{
1589	struct nfs_fattr *fattr;
1590
1591	fattr = kmalloc(size: sizeof(*fattr), GFP_KERNEL);
1592	if (fattr != NULL) {
1593	nfs_fattr_init(fattr);
1594	fattr->label = NULL;
1595	}
1596	return fattr;
1597	}
1598	EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1599
1600	struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1601	{
1602	struct nfs_fattr *fattr = nfs_alloc_fattr();
1603
1604	if (!fattr)
1605	return NULL;
1606
1607	fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1608	if (IS_ERR(ptr: fattr->label)) {
1609	kfree(objp: fattr);
1610	return NULL;
1611	}
1612
1613	return fattr;
1614	}
1615	EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1616
1617	struct nfs_fh *nfs_alloc_fhandle(void)
1618	{
1619	struct nfs_fh *fh;
1620
1621	fh = kmalloc(size: sizeof(struct nfs_fh), GFP_KERNEL);
1622	if (fh != NULL)
1623	fh->size = 0;
1624	return fh;
1625	}
1626	EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1627
1628	#ifdef NFS_DEBUG
1629	/*
1630	* _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1631	* in the same way that wireshark does
1632	*
1633	* @fh: file handle
1634	*
1635	* For debugging only.
1636	*/
1637	u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1638	{
1639	/* wireshark uses 32-bit AUTODIN crc and does a bitwise
1640	* not on the result */
1641	return nfs_fhandle_hash(fh);
1642	}
1643	EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1644
1645	/*
1646	* _nfs_display_fhandle - display an NFS file handle on the console
1647	*
1648	* @fh: file handle to display
1649	* @caption: display caption
1650	*
1651	* For debugging only.
1652	*/
1653	void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1654	{
1655	unsigned short i;
1656
1657	if (fh == NULL || fh->size == 0) {
1658	printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1659	return;
1660	}
1661
1662	printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1663	caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1664	for (i = 0; i < fh->size; i += 16) {
1665	__be32 *pos = (__be32 *)&fh->data[i];
1666
1667	switch ((fh->size - i - 1) >> 2) {
1668	case 0:
1669	printk(KERN_DEFAULT " %08x\n",
1670	be32_to_cpup(pos));
1671	break;
1672	case 1:
1673	printk(KERN_DEFAULT " %08x %08x\n",
1674	be32_to_cpup(pos), be32_to_cpup(pos + 1));
1675	break;
1676	case 2:
1677	printk(KERN_DEFAULT " %08x %08x %08x\n",
1678	be32_to_cpup(pos), be32_to_cpup(pos + 1),
1679	be32_to_cpup(pos + 2));
1680	break;
1681	default:
1682	printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1683	be32_to_cpup(pos), be32_to_cpup(pos + 1),
1684	be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1685	}
1686	}
1687	}
1688	EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1689	#endif
1690
1691	/**
1692	* nfs_inode_attrs_cmp_generic - compare attributes
1693	* @fattr: attributes
1694	* @inode: pointer to inode
1695	*
1696	* Attempt to divine whether or not an RPC call reply carrying stale
1697	* attributes got scheduled after another call carrying updated ones.
1698	* Note also the check for wraparound of 'attr_gencount'
1699	*
1700	* The function returns '1' if it thinks the attributes in @fattr are
1701	* more recent than the ones cached in @inode. Otherwise it returns
1702	* the value '0'.
1703	*/
1704	static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1705	const struct inode *inode)
1706	{
1707	unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1708
1709	return (long)(fattr->gencount - attr_gencount) > 0 ||
1710	(long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1711	}
1712
1713	/**
1714	* nfs_inode_attrs_cmp_monotonic - compare attributes
1715	* @fattr: attributes
1716	* @inode: pointer to inode
1717	*
1718	* Attempt to divine whether or not an RPC call reply carrying stale
1719	* attributes got scheduled after another call carrying updated ones.
1720	*
1721	* We assume that the server observes monotonic semantics for
1722	* the change attribute, so a larger value means that the attributes in
1723	* @fattr are more recent, in which case the function returns the
1724	* value '1'.
1725	* A return value of '0' indicates no measurable change
1726	* A return value of '-1' means that the attributes in @inode are
1727	* more recent.
1728	*/
1729	static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1730	const struct inode *inode)
1731	{
1732	s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1733	if (diff > 0)
1734	return 1;
1735	return diff == 0 ? 0 : -1;
1736	}
1737
1738	/**
1739	* nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1740	* @fattr: attributes
1741	* @inode: pointer to inode
1742	*
1743	* Attempt to divine whether or not an RPC call reply carrying stale
1744	* attributes got scheduled after another call carrying updated ones.
1745	*
1746	* We assume that the server observes strictly monotonic semantics for
1747	* the change attribute, so a larger value means that the attributes in
1748	* @fattr are more recent, in which case the function returns the
1749	* value '1'.
1750	* A return value of '-1' means that the attributes in @inode are
1751	* more recent or unchanged.
1752	*/
1753	static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1754	const struct inode *inode)
1755	{
1756	return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1757	}
1758
1759	/**
1760	* nfs_inode_attrs_cmp - compare attributes
1761	* @fattr: attributes
1762	* @inode: pointer to inode
1763	*
1764	* This function returns '1' if it thinks the attributes in @fattr are
1765	* more recent than the ones cached in @inode. It returns '-1' if
1766	* the attributes in @inode are more recent than the ones in @fattr,
1767	* and it returns 0 if not sure.
1768	*/
1769	static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1770	const struct inode *inode)
1771	{
1772	if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1773	return 1;
1774	switch (NFS_SERVER(inode)->change_attr_type) {
1775	case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1776	break;
1777	case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1778	if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1779	break;
1780	return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1781	default:
1782	if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1783	break;
1784	return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1785	}
1786	return 0;
1787	}
1788
1789	/**
1790	* nfs_inode_finish_partial_attr_update - complete a previous inode update
1791	* @fattr: attributes
1792	* @inode: pointer to inode
1793	*
1794	* Returns '1' if the last attribute update left the inode cached
1795	* attributes in a partially unrevalidated state, and @fattr
1796	* matches the change attribute of that partial update.
1797	* Otherwise returns '0'.
1798	*/
1799	static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1800	const struct inode *inode)
1801	{
1802	const unsigned long check_valid =
1803	NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1804	NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1805	NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1806	NFS_INO_INVALID_NLINK;
1807	unsigned long cache_validity = NFS_I(inode)->cache_validity;
1808	enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1809
1810	if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1811	!(cache_validity & NFS_INO_INVALID_CHANGE) &&
1812	(cache_validity & check_valid) != 0 &&
1813	(fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1814	nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1815	return 1;
1816	return 0;
1817	}
1818
1819	static void nfs_ooo_merge(struct nfs_inode *nfsi,
1820	u64 start, u64 end)
1821	{
1822	int i, cnt;
1823
1824	if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
1825	/* No point merging anything */
1826	return;
1827
1828	if (!nfsi->ooo) {
1829	nfsi->ooo = kmalloc(size: sizeof(*nfsi->ooo), GFP_ATOMIC);
1830	if (!nfsi->ooo) {
1831	nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1832	return;
1833	}
1834	nfsi->ooo->cnt = 0;
1835	}
1836
1837	/* add this range, merging if possible */
1838	cnt = nfsi->ooo->cnt;
1839	for (i = 0; i < cnt; i++) {
1840	if (end == nfsi->ooo->gap[i].start)
1841	end = nfsi->ooo->gap[i].end;
1842	else if (start == nfsi->ooo->gap[i].end)
1843	start = nfsi->ooo->gap[i].start;
1844	else
1845	continue;
1846	/* Remove 'i' from table and loop to insert the new range */
1847	cnt -= 1;
1848	nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
1849	i = -1;
1850	}
1851	if (start != end) {
1852	if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
1853	nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1854	kfree(objp: nfsi->ooo);
1855	nfsi->ooo = NULL;
1856	return;
1857	}
1858	nfsi->ooo->gap[cnt].start = start;
1859	nfsi->ooo->gap[cnt].end = end;
1860	cnt += 1;
1861	}
1862	nfsi->ooo->cnt = cnt;
1863	}
1864
1865	static void nfs_ooo_record(struct nfs_inode *nfsi,
1866	struct nfs_fattr *fattr)
1867	{
1868	/* This reply was out-of-order, so record in the
1869	* pre/post change id, possibly cancelling
1870	* gaps created when iversion was jumpped forward.
1871	*/
1872	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
1873	(fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
1874	nfs_ooo_merge(nfsi,
1875	start: fattr->change_attr,
1876	end: fattr->pre_change_attr);
1877	}
1878
1879	static int nfs_refresh_inode_locked(struct inode *inode,
1880	struct nfs_fattr *fattr)
1881	{
1882	int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1883	int ret = 0;
1884
1885	trace_nfs_refresh_inode_enter(inode);
1886
1887	if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1888	ret = nfs_update_inode(inode, fattr);
1889	else {
1890	nfs_ooo_record(nfsi: NFS_I(inode), fattr);
1891
1892	if (attr_cmp == 0)
1893	ret = nfs_check_inode_attributes(inode, fattr);
1894	}
1895
1896	trace_nfs_refresh_inode_exit(inode, error: ret);
1897	return ret;
1898	}
1899
1900	/**
1901	* nfs_refresh_inode - try to update the inode attribute cache
1902	* @inode: pointer to inode
1903	* @fattr: updated attributes
1904	*
1905	* Check that an RPC call that returned attributes has not overlapped with
1906	* other recent updates of the inode metadata, then decide whether it is
1907	* safe to do a full update of the inode attributes, or whether just to
1908	* call nfs_check_inode_attributes.
1909	*/
1910	int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1911	{
1912	int status;
1913
1914	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1915	return 0;
1916	spin_lock(lock: &inode->i_lock);
1917	status = nfs_refresh_inode_locked(inode, fattr);
1918	spin_unlock(lock: &inode->i_lock);
1919
1920	return status;
1921	}
1922	EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1923
1924	static int nfs_post_op_update_inode_locked(struct inode *inode,
1925	struct nfs_fattr *fattr, unsigned int invalid)
1926	{
1927	if (S_ISDIR(inode->i_mode))
1928	invalid |= NFS_INO_INVALID_DATA;
1929	nfs_set_cache_invalid(inode, invalid);
1930	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1931	return 0;
1932	return nfs_refresh_inode_locked(inode, fattr);
1933	}
1934
1935	/**
1936	* nfs_post_op_update_inode - try to update the inode attribute cache
1937	* @inode: pointer to inode
1938	* @fattr: updated attributes
1939	*
1940	* After an operation that has changed the inode metadata, mark the
1941	* attribute cache as being invalid, then try to update it.
1942	*
1943	* NB: if the server didn't return any post op attributes, this
1944	* function will force the retrieval of attributes before the next
1945	* NFS request. Thus it should be used only for operations that
1946	* are expected to change one or more attributes, to avoid
1947	* unnecessary NFS requests and trips through nfs_update_inode().
1948	*/
1949	int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1950	{
1951	int status;
1952
1953	spin_lock(lock: &inode->i_lock);
1954	nfs_fattr_set_barrier(fattr);
1955	status = nfs_post_op_update_inode_locked(inode, fattr,
1956	NFS_INO_INVALID_CHANGE
1957	| NFS_INO_INVALID_CTIME
1958	| NFS_INO_REVAL_FORCED);
1959	spin_unlock(lock: &inode->i_lock);
1960
1961	return status;
1962	}
1963	EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1964
1965	/**
1966	* nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1967	* @inode: pointer to inode
1968	* @fattr: updated attributes
1969	*
1970	* After an operation that has changed the inode metadata, mark the
1971	* attribute cache as being invalid, then try to update it. Fake up
1972	* weak cache consistency data, if none exist.
1973	*
1974	* This function is mainly designed to be used by the ->write_done() functions.
1975	*/
1976	int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1977	{
1978	int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1979	int status;
1980
1981	/* Don't do a WCC update if these attributes are already stale */
1982	if (attr_cmp < 0)
1983	return 0;
1984	if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1985	/* Record the pre/post change info before clearing PRECHANGE */
1986	nfs_ooo_record(nfsi: NFS_I(inode), fattr);
1987	fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1988	| NFS_ATTR_FATTR_PRESIZE
1989	| NFS_ATTR_FATTR_PREMTIME
1990	| NFS_ATTR_FATTR_PRECTIME);
1991	goto out_noforce;
1992	}
1993	if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1994	(fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1995	fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1996	fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1997	}
1998	if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1999	(fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
2000	fattr->pre_ctime = inode_get_ctime(inode);
2001	fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
2002	}
2003	if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
2004	(fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
2005	fattr->pre_mtime = inode_get_mtime(inode);
2006	fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
2007	}
2008	if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
2009	(fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
2010	fattr->pre_size = i_size_read(inode);
2011	fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
2012	}
2013	out_noforce:
2014	status = nfs_post_op_update_inode_locked(inode, fattr,
2015	NFS_INO_INVALID_CHANGE
2016	| NFS_INO_INVALID_CTIME
2017	| NFS_INO_INVALID_MTIME
2018	| NFS_INO_INVALID_BLOCKS);
2019	return status;
2020	}
2021
2022	/**
2023	* nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
2024	* @inode: pointer to inode
2025	* @fattr: updated attributes
2026	*
2027	* After an operation that has changed the inode metadata, mark the
2028	* attribute cache as being invalid, then try to update it. Fake up
2029	* weak cache consistency data, if none exist.
2030	*
2031	* This function is mainly designed to be used by the ->write_done() functions.
2032	*/
2033	int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
2034	{
2035	int status;
2036
2037	spin_lock(lock: &inode->i_lock);
2038	nfs_fattr_set_barrier(fattr);
2039	status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
2040	spin_unlock(lock: &inode->i_lock);
2041	return status;
2042	}
2043	EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
2044
2045
2046	/*
2047	* Many nfs protocol calls return the new file attributes after
2048	* an operation. Here we update the inode to reflect the state
2049	* of the server's inode.
2050	*
2051	* This is a bit tricky because we have to make sure all dirty pages
2052	* have been sent off to the server before calling invalidate_inode_pages.
2053	* To make sure no other process adds more write requests while we try
2054	* our best to flush them, we make them sleep during the attribute refresh.
2055	*
2056	* A very similar scenario holds for the dir cache.
2057	*/
2058	static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
2059	{
2060	struct nfs_server *server = NFS_SERVER(inode);
2061	struct nfs_inode *nfsi = NFS_I(inode);
2062	loff_t cur_isize, new_isize;
2063	u64 fattr_supported = server->fattr_valid;
2064	unsigned long invalid = 0;
2065	unsigned long now = jiffies;
2066	unsigned long save_cache_validity;
2067	bool have_writers = nfs_file_has_buffered_writers(nfsi);
2068	bool cache_revalidated = true;
2069	bool attr_changed = false;
2070	bool have_delegation;
2071
2072	dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
2073	__func__, inode->i_sb->s_id, inode->i_ino,
2074	nfs_display_fhandle_hash(NFS_FH(inode)),
2075	atomic_read(&inode->i_count), fattr->valid);
2076
2077	if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2078	/* Only a mounted-on-fileid? Just exit */
2079	if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2080	return 0;
2081	/* Has the inode gone and changed behind our back? */
2082	} else if (nfsi->fileid != fattr->fileid) {
2083	/* Is this perhaps the mounted-on fileid? */
2084	if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2085	nfsi->fileid == fattr->mounted_on_fileid)
2086	return 0;
2087	printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2088	"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2089	NFS_SERVER(inode)->nfs_client->cl_hostname,
2090	inode->i_sb->s_id, (long long)nfsi->fileid,
2091	(long long)fattr->fileid);
2092	goto out_err;
2093	}
2094
2095	/*
2096	* Make sure the inode's type hasn't changed.
2097	*/
2098	if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, mode: fattr->mode)) {
2099	/*
2100	* Big trouble! The inode has become a different object.
2101	*/
2102	printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2103	__func__, inode->i_ino, inode->i_mode, fattr->mode);
2104	goto out_err;
2105	}
2106
2107	/* Update the fsid? */
2108	if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2109	!nfs_fsid_equal(a: &server->fsid, b: &fattr->fsid) &&
2110	!IS_AUTOMOUNT(inode))
2111	server->fsid = fattr->fsid;
2112
2113	/* Save the delegation state before clearing cache_validity */
2114	have_delegation = nfs_have_delegated_attributes(inode);
2115
2116	/*
2117	* Update the read time so we don't revalidate too often.
2118	*/
2119	nfsi->read_cache_jiffies = fattr->time_start;
2120
2121	save_cache_validity = nfsi->cache_validity;
2122	nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2123	| NFS_INO_INVALID_ATIME
2124	| NFS_INO_REVAL_FORCED
2125	| NFS_INO_INVALID_BLOCKS);
2126
2127	/* Do atomic weak cache consistency updates */
2128	nfs_wcc_update_inode(inode, fattr);
2129
2130	if (pnfs_layoutcommit_outstanding(inode)) {
2131	nfsi->cache_validity |=
2132	save_cache_validity &
2133	(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2134	NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2135	NFS_INO_INVALID_BLOCKS);
2136	cache_revalidated = false;
2137	}
2138
2139	/* More cache consistency checks */
2140	if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2141	if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
2142	nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
2143	/* There is one remaining gap that hasn't been
2144	* merged into iversion - do that now.
2145	*/
2146	inode_set_iversion_raw(inode, val: nfsi->ooo->gap[0].start);
2147	kfree(objp: nfsi->ooo);
2148	nfsi->ooo = NULL;
2149	}
2150	if (!inode_eq_iversion_raw(inode, old: fattr->change_attr)) {
2151	/* Could it be a race with writeback? */
2152	if (!(have_writers || have_delegation)) {
2153	invalid |= NFS_INO_INVALID_DATA
2154	| NFS_INO_INVALID_ACCESS
2155	| NFS_INO_INVALID_ACL
2156	| NFS_INO_INVALID_XATTR;
2157	/* Force revalidate of all attributes */
2158	save_cache_validity |= NFS_INO_INVALID_CTIME
2159	| NFS_INO_INVALID_MTIME
2160	| NFS_INO_INVALID_SIZE
2161	| NFS_INO_INVALID_BLOCKS
2162	| NFS_INO_INVALID_NLINK
2163	| NFS_INO_INVALID_MODE
2164	| NFS_INO_INVALID_OTHER;
2165	if (S_ISDIR(inode->i_mode))
2166	nfs_force_lookup_revalidate(dir: inode);
2167	attr_changed = true;
2168	dprintk("NFS: change_attr change on server for file %s/%ld\n",
2169	inode->i_sb->s_id,
2170	inode->i_ino);
2171	} else if (!have_delegation) {
2172	nfs_ooo_record(nfsi, fattr);
2173	nfs_ooo_merge(nfsi, start: inode_peek_iversion_raw(inode),
2174	end: fattr->change_attr);
2175	}
2176	inode_set_iversion_raw(inode, val: fattr->change_attr);
2177	}
2178	} else {
2179	nfsi->cache_validity |=
2180	save_cache_validity & NFS_INO_INVALID_CHANGE;
2181	if (!have_delegation ||
2182	(nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2183	cache_revalidated = false;
2184	}
2185
2186	if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2187	inode_set_mtime_to_ts(inode, ts: fattr->mtime);
2188	else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2189	nfsi->cache_validity |=
2190	save_cache_validity & NFS_INO_INVALID_MTIME;
2191
2192	if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2193	inode_set_ctime_to_ts(inode, ts: fattr->ctime);
2194	else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2195	nfsi->cache_validity |=
2196	save_cache_validity & NFS_INO_INVALID_CTIME;
2197
2198	/* Check if our cached file size is stale */
2199	if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2200	new_isize = nfs_size_to_loff_t(size: fattr->size);
2201	cur_isize = i_size_read(inode);
2202	if (new_isize != cur_isize && !have_delegation) {
2203	/* Do we perhaps have any outstanding writes, or has
2204	* the file grown beyond our last write? */
2205	if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2206	trace_nfs_size_update(inode, new_size: new_isize);
2207	i_size_write(inode, i_size: new_isize);
2208	if (!have_writers)
2209	invalid |= NFS_INO_INVALID_DATA;
2210	}
2211	}
2212	if (new_isize == 0 &&
2213	!(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2214	NFS_ATTR_FATTR_BLOCKS_USED))) {
2215	fattr->du.nfs3.used = 0;
2216	fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2217	}
2218	} else
2219	nfsi->cache_validity |=
2220	save_cache_validity & NFS_INO_INVALID_SIZE;
2221
2222	if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2223	inode_set_atime_to_ts(inode, ts: fattr->atime);
2224	else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2225	nfsi->cache_validity |=
2226	save_cache_validity & NFS_INO_INVALID_ATIME;
2227
2228	if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2229	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2230	umode_t newmode = inode->i_mode & S_IFMT;
2231	newmode |= fattr->mode & S_IALLUGO;
2232	inode->i_mode = newmode;
2233	invalid |= NFS_INO_INVALID_ACCESS
2234	| NFS_INO_INVALID_ACL;
2235	}
2236	} else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2237	nfsi->cache_validity |=
2238	save_cache_validity & NFS_INO_INVALID_MODE;
2239
2240	if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2241	if (!uid_eq(left: inode->i_uid, right: fattr->uid)) {
2242	invalid |= NFS_INO_INVALID_ACCESS
2243	| NFS_INO_INVALID_ACL;
2244	inode->i_uid = fattr->uid;
2245	}
2246	} else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2247	nfsi->cache_validity |=
2248	save_cache_validity & NFS_INO_INVALID_OTHER;
2249
2250	if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2251	if (!gid_eq(left: inode->i_gid, right: fattr->gid)) {
2252	invalid |= NFS_INO_INVALID_ACCESS
2253	| NFS_INO_INVALID_ACL;
2254	inode->i_gid = fattr->gid;
2255	}
2256	} else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2257	nfsi->cache_validity |=
2258	save_cache_validity & NFS_INO_INVALID_OTHER;
2259
2260	if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2261	if (inode->i_nlink != fattr->nlink)
2262	set_nlink(inode, nlink: fattr->nlink);
2263	} else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2264	nfsi->cache_validity |=
2265	save_cache_validity & NFS_INO_INVALID_NLINK;
2266
2267	if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2268	/*
2269	* report the blocks in 512byte units
2270	*/
2271	inode->i_blocks = nfs_calc_block_size(tsize: fattr->du.nfs3.used);
2272	} else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2273	nfsi->cache_validity |=
2274	save_cache_validity & NFS_INO_INVALID_BLOCKS;
2275
2276	if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2277	inode->i_blocks = fattr->du.nfs2.blocks;
2278	else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2279	nfsi->cache_validity |=
2280	save_cache_validity & NFS_INO_INVALID_BLOCKS;
2281
2282	/* Update attrtimeo value if we're out of the unstable period */
2283	if (attr_changed) {
2284	nfs_inc_stats(inode, stat: NFSIOS_ATTRINVALIDATE);
2285	nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2286	nfsi->attrtimeo_timestamp = now;
2287	/* Set barrier to be more recent than all outstanding updates */
2288	nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2289	} else {
2290	if (cache_revalidated) {
2291	if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2292	nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2293	nfsi->attrtimeo <<= 1;
2294	if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2295	nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2296	}
2297	nfsi->attrtimeo_timestamp = now;
2298	}
2299	/* Set the barrier to be more recent than this fattr */
2300	if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2301	nfsi->attr_gencount = fattr->gencount;
2302	}
2303
2304	/* Don't invalidate the data if we were to blame */
2305	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2306	|| S_ISLNK(inode->i_mode)))
2307	invalid &= ~NFS_INO_INVALID_DATA;
2308	nfs_set_cache_invalid(inode, invalid);
2309
2310	return 0;
2311	out_err:
2312	/*
2313	* No need to worry about unhashing the dentry, as the
2314	* lookup validation will know that the inode is bad.
2315	* (But we fall through to invalidate the caches.)
2316	*/
2317	nfs_set_inode_stale_locked(inode);
2318	return -ESTALE;
2319	}
2320
2321	struct inode *nfs_alloc_inode(struct super_block *sb)
2322	{
2323	struct nfs_inode *nfsi;
2324	nfsi = alloc_inode_sb(sb, cache: nfs_inode_cachep, GFP_KERNEL);
2325	if (!nfsi)
2326	return NULL;
2327	nfsi->flags = 0UL;
2328	nfsi->cache_validity = 0UL;
2329	nfsi->ooo = NULL;
2330	#if IS_ENABLED(CONFIG_NFS_V4)
2331	nfsi->nfs4_acl = NULL;
2332	#endif /* CONFIG_NFS_V4 */
2333	#ifdef CONFIG_NFS_V4_2
2334	nfsi->xattr_cache = NULL;
2335	#endif
2336	nfs_netfs_inode_init(nfsi);
2337
2338	return &nfsi->vfs_inode;
2339	}
2340	EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2341
2342	void nfs_free_inode(struct inode *inode)
2343	{
2344	kfree(objp: NFS_I(inode)->ooo);
2345	kmem_cache_free(s: nfs_inode_cachep, objp: NFS_I(inode));
2346	}
2347	EXPORT_SYMBOL_GPL(nfs_free_inode);
2348
2349	static inline void nfs4_init_once(struct nfs_inode *nfsi)
2350	{
2351	#if IS_ENABLED(CONFIG_NFS_V4)
2352	INIT_LIST_HEAD(list: &nfsi->open_states);
2353	nfsi->delegation = NULL;
2354	init_rwsem(&nfsi->rwsem);
2355	nfsi->layout = NULL;
2356	#endif
2357	}
2358
2359	static void init_once(void *foo)
2360	{
2361	struct nfs_inode *nfsi = foo;
2362
2363	inode_init_once(&nfsi->vfs_inode);
2364	INIT_LIST_HEAD(list: &nfsi->open_files);
2365	INIT_LIST_HEAD(list: &nfsi->access_cache_entry_lru);
2366	INIT_LIST_HEAD(list: &nfsi->access_cache_inode_lru);
2367	nfs4_init_once(nfsi);
2368	}
2369
2370	static int __init nfs_init_inodecache(void)
2371	{
2372	nfs_inode_cachep = kmem_cache_create(name: "nfs_inode_cache",
2373	size: sizeof(struct nfs_inode),
2374	align: 0, flags: (SLAB_RECLAIM_ACCOUNT|
2375	SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2376	ctor: init_once);
2377	if (nfs_inode_cachep == NULL)
2378	return -ENOMEM;
2379
2380	return 0;
2381	}
2382
2383	static void nfs_destroy_inodecache(void)
2384	{
2385	/*
2386	* Make sure all delayed rcu free inodes are flushed before we
2387	* destroy cache.
2388	*/
2389	rcu_barrier();
2390	kmem_cache_destroy(s: nfs_inode_cachep);
2391	}
2392
2393	struct workqueue_struct *nfsiod_workqueue;
2394	EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2395
2396	/*
2397	* start up the nfsiod workqueue
2398	*/
2399	static int nfsiod_start(void)
2400	{
2401	struct workqueue_struct *wq;
2402	dprintk("RPC: creating workqueue nfsiod\n");
2403	wq = alloc_workqueue(fmt: "nfsiod", flags: WQ_MEM_RECLAIM | WQ_UNBOUND, max_active: 0);
2404	if (wq == NULL)
2405	return -ENOMEM;
2406	nfsiod_workqueue = wq;
2407	return 0;
2408	}
2409
2410	/*
2411	* Destroy the nfsiod workqueue
2412	*/
2413	static void nfsiod_stop(void)
2414	{
2415	struct workqueue_struct *wq;
2416
2417	wq = nfsiod_workqueue;
2418	if (wq == NULL)
2419	return;
2420	nfsiod_workqueue = NULL;
2421	destroy_workqueue(wq);
2422	}
2423
2424	unsigned int nfs_net_id;
2425	EXPORT_SYMBOL_GPL(nfs_net_id);
2426
2427	static int nfs_net_init(struct net *net)
2428	{
2429	nfs_clients_init(net);
2430	return nfs_fs_proc_net_init(net);
2431	}
2432
2433	static void nfs_net_exit(struct net *net)
2434	{
2435	nfs_fs_proc_net_exit(net);
2436	nfs_clients_exit(net);
2437	}
2438
2439	static struct pernet_operations nfs_net_ops = {
2440	.init = nfs_net_init,
2441	.exit = nfs_net_exit,
2442	.id = &nfs_net_id,
2443	.size = sizeof(struct nfs_net),
2444	};
2445
2446	/*
2447	* Initialize NFS
2448	*/
2449	static int __init init_nfs_fs(void)
2450	{
2451	int err;
2452
2453	err = nfs_sysfs_init();
2454	if (err < 0)
2455	goto out10;
2456
2457	err = register_pernet_subsys(&nfs_net_ops);
2458	if (err < 0)
2459	goto out9;
2460
2461	err = nfsiod_start();
2462	if (err)
2463	goto out7;
2464
2465	err = nfs_fs_proc_init();
2466	if (err)
2467	goto out6;
2468
2469	err = nfs_init_nfspagecache();
2470	if (err)
2471	goto out5;
2472
2473	err = nfs_init_inodecache();
2474	if (err)
2475	goto out4;
2476
2477	err = nfs_init_readpagecache();
2478	if (err)
2479	goto out3;
2480
2481	err = nfs_init_writepagecache();
2482	if (err)
2483	goto out2;
2484
2485	err = nfs_init_directcache();
2486	if (err)
2487	goto out1;
2488
2489	rpc_proc_register(&init_net, &nfs_rpcstat);
2490
2491	err = register_nfs_fs();
2492	if (err)
2493	goto out0;
2494
2495	return 0;
2496	out0:
2497	rpc_proc_unregister(&init_net, "nfs");
2498	nfs_destroy_directcache();
2499	out1:
2500	nfs_destroy_writepagecache();
2501	out2:
2502	nfs_destroy_readpagecache();
2503	out3:
2504	nfs_destroy_inodecache();
2505	out4:
2506	nfs_destroy_nfspagecache();
2507	out5:
2508	nfs_fs_proc_exit();
2509	out6:
2510	nfsiod_stop();
2511	out7:
2512	unregister_pernet_subsys(&nfs_net_ops);
2513	out9:
2514	nfs_sysfs_exit();
2515	out10:
2516	return err;
2517	}
2518
2519	static void __exit exit_nfs_fs(void)
2520	{
2521	nfs_destroy_directcache();
2522	nfs_destroy_writepagecache();
2523	nfs_destroy_readpagecache();
2524	nfs_destroy_inodecache();
2525	nfs_destroy_nfspagecache();
2526	unregister_pernet_subsys(&nfs_net_ops);
2527	rpc_proc_unregister(&init_net, "nfs");
2528	unregister_nfs_fs();
2529	nfs_fs_proc_exit();
2530	nfsiod_stop();
2531	nfs_sysfs_exit();
2532	}
2533
2534	/* Not quite true; I just maintain it */
2535	MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2536	MODULE_LICENSE("GPL");
2537	module_param(enable_ino64, bool, 0644);
2538
2539	module_init(init_nfs_fs)
2540	module_exit(exit_nfs_fs)
2541