1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Copyright (c) 2014 Christoph Hellwig. |
4 | */ |
5 | #include <linux/blkdev.h> |
6 | #include <linux/kmod.h> |
7 | #include <linux/file.h> |
8 | #include <linux/jhash.h> |
9 | #include <linux/sched.h> |
10 | #include <linux/sunrpc/addr.h> |
11 | |
12 | #include "pnfs.h" |
13 | #include "netns.h" |
14 | #include "trace.h" |
15 | |
16 | #define NFSDDBG_FACILITY NFSDDBG_PNFS |
17 | |
18 | struct nfs4_layout { |
19 | struct list_head lo_perstate; |
20 | struct nfs4_layout_stateid *lo_state; |
21 | struct nfsd4_layout_seg lo_seg; |
22 | }; |
23 | |
24 | static struct kmem_cache *nfs4_layout_cache; |
25 | static struct kmem_cache *nfs4_layout_stateid_cache; |
26 | |
27 | static const struct nfsd4_callback_ops nfsd4_cb_layout_ops; |
28 | static const struct lock_manager_operations nfsd4_layouts_lm_ops; |
29 | |
30 | const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = { |
31 | #ifdef CONFIG_NFSD_FLEXFILELAYOUT |
32 | [LAYOUT_FLEX_FILES] = &ff_layout_ops, |
33 | #endif |
34 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
35 | [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops, |
36 | #endif |
37 | #ifdef CONFIG_NFSD_SCSILAYOUT |
38 | [LAYOUT_SCSI] = &scsi_layout_ops, |
39 | #endif |
40 | }; |
41 | |
42 | /* pNFS device ID to export fsid mapping */ |
43 | #define DEVID_HASH_BITS 8 |
44 | #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS) |
45 | #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1) |
46 | static u64 nfsd_devid_seq = 1; |
47 | static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE]; |
48 | static DEFINE_SPINLOCK(nfsd_devid_lock); |
49 | |
50 | static inline u32 devid_hashfn(u64 idx) |
51 | { |
52 | return jhash_2words(a: idx, b: idx >> 32, initval: 0) & DEVID_HASH_MASK; |
53 | } |
54 | |
55 | static void |
56 | nfsd4_alloc_devid_map(const struct svc_fh *fhp) |
57 | { |
58 | const struct knfsd_fh *fh = &fhp->fh_handle; |
59 | size_t fsid_len = key_len(type: fh->fh_fsid_type); |
60 | struct nfsd4_deviceid_map *map, *old; |
61 | int i; |
62 | |
63 | map = kzalloc(size: sizeof(*map) + fsid_len, GFP_KERNEL); |
64 | if (!map) |
65 | return; |
66 | |
67 | map->fsid_type = fh->fh_fsid_type; |
68 | memcpy(&map->fsid, fh->fh_fsid, fsid_len); |
69 | |
70 | spin_lock(lock: &nfsd_devid_lock); |
71 | if (fhp->fh_export->ex_devid_map) |
72 | goto out_unlock; |
73 | |
74 | for (i = 0; i < DEVID_HASH_SIZE; i++) { |
75 | list_for_each_entry(old, &nfsd_devid_hash[i], hash) { |
76 | if (old->fsid_type != fh->fh_fsid_type) |
77 | continue; |
78 | if (memcmp(p: old->fsid, q: fh->fh_fsid, |
79 | size: key_len(type: old->fsid_type))) |
80 | continue; |
81 | |
82 | fhp->fh_export->ex_devid_map = old; |
83 | goto out_unlock; |
84 | } |
85 | } |
86 | |
87 | map->idx = nfsd_devid_seq++; |
88 | list_add_tail_rcu(new: &map->hash, head: &nfsd_devid_hash[devid_hashfn(idx: map->idx)]); |
89 | fhp->fh_export->ex_devid_map = map; |
90 | map = NULL; |
91 | |
92 | out_unlock: |
93 | spin_unlock(lock: &nfsd_devid_lock); |
94 | kfree(objp: map); |
95 | } |
96 | |
97 | struct nfsd4_deviceid_map * |
98 | nfsd4_find_devid_map(int idx) |
99 | { |
100 | struct nfsd4_deviceid_map *map, *ret = NULL; |
101 | |
102 | rcu_read_lock(); |
103 | list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash) |
104 | if (map->idx == idx) |
105 | ret = map; |
106 | rcu_read_unlock(); |
107 | |
108 | return ret; |
109 | } |
110 | |
111 | int |
112 | nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp, |
113 | u32 device_generation) |
114 | { |
115 | if (!fhp->fh_export->ex_devid_map) { |
116 | nfsd4_alloc_devid_map(fhp); |
117 | if (!fhp->fh_export->ex_devid_map) |
118 | return -ENOMEM; |
119 | } |
120 | |
121 | id->fsid_idx = fhp->fh_export->ex_devid_map->idx; |
122 | id->generation = device_generation; |
123 | id->pad = 0; |
124 | return 0; |
125 | } |
126 | |
127 | void nfsd4_setup_layout_type(struct svc_export *exp) |
128 | { |
129 | #if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT) |
130 | struct super_block *sb = exp->ex_path.mnt->mnt_sb; |
131 | #endif |
132 | |
133 | if (!(exp->ex_flags & NFSEXP_PNFS)) |
134 | return; |
135 | |
136 | #ifdef CONFIG_NFSD_FLEXFILELAYOUT |
137 | exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES; |
138 | #endif |
139 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
140 | if (sb->s_export_op->get_uuid && |
141 | sb->s_export_op->map_blocks && |
142 | sb->s_export_op->commit_blocks) |
143 | exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME; |
144 | #endif |
145 | #ifdef CONFIG_NFSD_SCSILAYOUT |
146 | if (sb->s_export_op->map_blocks && |
147 | sb->s_export_op->commit_blocks && |
148 | sb->s_bdev && |
149 | sb->s_bdev->bd_disk->fops->pr_ops && |
150 | sb->s_bdev->bd_disk->fops->get_unique_id) |
151 | exp->ex_layout_types |= 1 << LAYOUT_SCSI; |
152 | #endif |
153 | } |
154 | |
155 | static void |
156 | nfsd4_free_layout_stateid(struct nfs4_stid *stid) |
157 | { |
158 | struct nfs4_layout_stateid *ls = layoutstateid(s: stid); |
159 | struct nfs4_client *clp = ls->ls_stid.sc_client; |
160 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
161 | |
162 | trace_nfsd_layoutstate_free(stp: &ls->ls_stid.sc_stateid); |
163 | |
164 | spin_lock(lock: &clp->cl_lock); |
165 | list_del_init(entry: &ls->ls_perclnt); |
166 | spin_unlock(lock: &clp->cl_lock); |
167 | |
168 | spin_lock(lock: &fp->fi_lock); |
169 | list_del_init(entry: &ls->ls_perfile); |
170 | spin_unlock(lock: &fp->fi_lock); |
171 | |
172 | if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
173 | vfs_setlease(ls->ls_file->nf_file, F_UNLCK, NULL, (void **)&ls); |
174 | nfsd_file_put(nf: ls->ls_file); |
175 | |
176 | if (ls->ls_recalled) |
177 | atomic_dec(v: &ls->ls_stid.sc_file->fi_lo_recalls); |
178 | |
179 | kmem_cache_free(s: nfs4_layout_stateid_cache, objp: ls); |
180 | } |
181 | |
182 | static int |
183 | nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) |
184 | { |
185 | struct file_lock *fl; |
186 | int status; |
187 | |
188 | if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
189 | return 0; |
190 | |
191 | fl = locks_alloc_lock(); |
192 | if (!fl) |
193 | return -ENOMEM; |
194 | locks_init_lock(fl); |
195 | fl->fl_lmops = &nfsd4_layouts_lm_ops; |
196 | fl->fl_flags = FL_LAYOUT; |
197 | fl->fl_type = F_RDLCK; |
198 | fl->fl_end = OFFSET_MAX; |
199 | fl->fl_owner = ls; |
200 | fl->fl_pid = current->tgid; |
201 | fl->fl_file = ls->ls_file->nf_file; |
202 | |
203 | status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); |
204 | if (status) { |
205 | locks_free_lock(fl); |
206 | return status; |
207 | } |
208 | BUG_ON(fl != NULL); |
209 | return 0; |
210 | } |
211 | |
212 | static struct nfs4_layout_stateid * |
213 | nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, |
214 | struct nfs4_stid *parent, u32 layout_type) |
215 | { |
216 | struct nfs4_client *clp = cstate->clp; |
217 | struct nfs4_file *fp = parent->sc_file; |
218 | struct nfs4_layout_stateid *ls; |
219 | struct nfs4_stid *stp; |
220 | |
221 | stp = nfs4_alloc_stid(cl: cstate->clp, slab: nfs4_layout_stateid_cache, |
222 | sc_free: nfsd4_free_layout_stateid); |
223 | if (!stp) |
224 | return NULL; |
225 | |
226 | get_nfs4_file(fi: fp); |
227 | stp->sc_file = fp; |
228 | |
229 | ls = layoutstateid(s: stp); |
230 | INIT_LIST_HEAD(list: &ls->ls_perclnt); |
231 | INIT_LIST_HEAD(list: &ls->ls_perfile); |
232 | spin_lock_init(&ls->ls_lock); |
233 | INIT_LIST_HEAD(list: &ls->ls_layouts); |
234 | mutex_init(&ls->ls_mutex); |
235 | ls->ls_layout_type = layout_type; |
236 | nfsd4_init_cb(cb: &ls->ls_recall, clp, ops: &nfsd4_cb_layout_ops, |
237 | op: NFSPROC4_CLNT_CB_LAYOUT); |
238 | |
239 | if (parent->sc_type == NFS4_DELEG_STID) |
240 | ls->ls_file = nfsd_file_get(nf: fp->fi_deleg_file); |
241 | else |
242 | ls->ls_file = find_any_file(f: fp); |
243 | BUG_ON(!ls->ls_file); |
244 | |
245 | if (nfsd4_layout_setlease(ls)) { |
246 | nfsd_file_put(nf: ls->ls_file); |
247 | put_nfs4_file(fi: fp); |
248 | kmem_cache_free(s: nfs4_layout_stateid_cache, objp: ls); |
249 | return NULL; |
250 | } |
251 | |
252 | spin_lock(lock: &clp->cl_lock); |
253 | stp->sc_type = NFS4_LAYOUT_STID; |
254 | list_add(new: &ls->ls_perclnt, head: &clp->cl_lo_states); |
255 | spin_unlock(lock: &clp->cl_lock); |
256 | |
257 | spin_lock(lock: &fp->fi_lock); |
258 | list_add(new: &ls->ls_perfile, head: &fp->fi_lo_states); |
259 | spin_unlock(lock: &fp->fi_lock); |
260 | |
261 | trace_nfsd_layoutstate_alloc(stp: &ls->ls_stid.sc_stateid); |
262 | return ls; |
263 | } |
264 | |
265 | __be32 |
266 | nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, |
267 | struct nfsd4_compound_state *cstate, stateid_t *stateid, |
268 | bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) |
269 | { |
270 | struct nfs4_layout_stateid *ls; |
271 | struct nfs4_stid *stid; |
272 | unsigned char typemask = NFS4_LAYOUT_STID; |
273 | __be32 status; |
274 | |
275 | if (create) |
276 | typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); |
277 | |
278 | status = nfsd4_lookup_stateid(cstate, stateid, typemask, s: &stid, |
279 | nn: net_generic(SVC_NET(rqstp), id: nfsd_net_id)); |
280 | if (status) |
281 | goto out; |
282 | |
283 | if (!fh_match(fh1: &cstate->current_fh.fh_handle, |
284 | fh2: &stid->sc_file->fi_fhandle)) { |
285 | status = nfserr_bad_stateid; |
286 | goto out_put_stid; |
287 | } |
288 | |
289 | if (stid->sc_type != NFS4_LAYOUT_STID) { |
290 | ls = nfsd4_alloc_layout_stateid(cstate, parent: stid, layout_type); |
291 | nfs4_put_stid(s: stid); |
292 | |
293 | status = nfserr_jukebox; |
294 | if (!ls) |
295 | goto out; |
296 | mutex_lock(&ls->ls_mutex); |
297 | } else { |
298 | ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); |
299 | |
300 | status = nfserr_bad_stateid; |
301 | mutex_lock(&ls->ls_mutex); |
302 | if (nfsd4_stateid_generation_after(a: stateid, b: &stid->sc_stateid)) |
303 | goto out_unlock_stid; |
304 | if (layout_type != ls->ls_layout_type) |
305 | goto out_unlock_stid; |
306 | } |
307 | |
308 | *lsp = ls; |
309 | return 0; |
310 | |
311 | out_unlock_stid: |
312 | mutex_unlock(lock: &ls->ls_mutex); |
313 | out_put_stid: |
314 | nfs4_put_stid(s: stid); |
315 | out: |
316 | return status; |
317 | } |
318 | |
319 | static void |
320 | nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) |
321 | { |
322 | spin_lock(lock: &ls->ls_lock); |
323 | if (ls->ls_recalled) |
324 | goto out_unlock; |
325 | |
326 | if (list_empty(head: &ls->ls_layouts)) |
327 | goto out_unlock; |
328 | |
329 | ls->ls_recalled = true; |
330 | atomic_inc(v: &ls->ls_stid.sc_file->fi_lo_recalls); |
331 | trace_nfsd_layout_recall(stp: &ls->ls_stid.sc_stateid); |
332 | |
333 | refcount_inc(r: &ls->ls_stid.sc_count); |
334 | nfsd4_run_cb(cb: &ls->ls_recall); |
335 | |
336 | out_unlock: |
337 | spin_unlock(lock: &ls->ls_lock); |
338 | } |
339 | |
340 | static inline u64 |
341 | layout_end(struct nfsd4_layout_seg *seg) |
342 | { |
343 | u64 end = seg->offset + seg->length; |
344 | return end >= seg->offset ? end : NFS4_MAX_UINT64; |
345 | } |
346 | |
347 | static void |
348 | layout_update_len(struct nfsd4_layout_seg *lo, u64 end) |
349 | { |
350 | if (end == NFS4_MAX_UINT64) |
351 | lo->length = NFS4_MAX_UINT64; |
352 | else |
353 | lo->length = end - lo->offset; |
354 | } |
355 | |
356 | static bool |
357 | layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) |
358 | { |
359 | if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) |
360 | return false; |
361 | if (layout_end(seg: &lo->lo_seg) <= s->offset) |
362 | return false; |
363 | if (layout_end(seg: s) <= lo->lo_seg.offset) |
364 | return false; |
365 | return true; |
366 | } |
367 | |
368 | static bool |
369 | layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) |
370 | { |
371 | if (lo->iomode != new->iomode) |
372 | return false; |
373 | if (layout_end(seg: new) < lo->offset) |
374 | return false; |
375 | if (layout_end(seg: lo) < new->offset) |
376 | return false; |
377 | |
378 | lo->offset = min(lo->offset, new->offset); |
379 | layout_update_len(lo, max(layout_end(lo), layout_end(new))); |
380 | return true; |
381 | } |
382 | |
383 | static __be32 |
384 | nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) |
385 | { |
386 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
387 | struct nfs4_layout_stateid *l, *n; |
388 | __be32 nfserr = nfs_ok; |
389 | |
390 | assert_spin_locked(&fp->fi_lock); |
391 | |
392 | list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { |
393 | if (l != ls) { |
394 | nfsd4_recall_file_layout(ls: l); |
395 | nfserr = nfserr_recallconflict; |
396 | } |
397 | } |
398 | |
399 | return nfserr; |
400 | } |
401 | |
402 | __be32 |
403 | nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) |
404 | { |
405 | struct nfsd4_layout_seg *seg = &lgp->lg_seg; |
406 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
407 | struct nfs4_layout *lp, *new = NULL; |
408 | __be32 nfserr; |
409 | |
410 | spin_lock(lock: &fp->fi_lock); |
411 | nfserr = nfsd4_recall_conflict(ls); |
412 | if (nfserr) |
413 | goto out; |
414 | spin_lock(lock: &ls->ls_lock); |
415 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { |
416 | if (layouts_try_merge(lo: &lp->lo_seg, new: seg)) |
417 | goto done; |
418 | } |
419 | spin_unlock(lock: &ls->ls_lock); |
420 | spin_unlock(lock: &fp->fi_lock); |
421 | |
422 | new = kmem_cache_alloc(cachep: nfs4_layout_cache, GFP_KERNEL); |
423 | if (!new) |
424 | return nfserr_jukebox; |
425 | memcpy(&new->lo_seg, seg, sizeof(new->lo_seg)); |
426 | new->lo_state = ls; |
427 | |
428 | spin_lock(lock: &fp->fi_lock); |
429 | nfserr = nfsd4_recall_conflict(ls); |
430 | if (nfserr) |
431 | goto out; |
432 | spin_lock(lock: &ls->ls_lock); |
433 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { |
434 | if (layouts_try_merge(lo: &lp->lo_seg, new: seg)) |
435 | goto done; |
436 | } |
437 | |
438 | refcount_inc(r: &ls->ls_stid.sc_count); |
439 | list_add_tail(new: &new->lo_perstate, head: &ls->ls_layouts); |
440 | new = NULL; |
441 | done: |
442 | nfs4_inc_and_copy_stateid(dst: &lgp->lg_sid, stid: &ls->ls_stid); |
443 | spin_unlock(lock: &ls->ls_lock); |
444 | out: |
445 | spin_unlock(lock: &fp->fi_lock); |
446 | if (new) |
447 | kmem_cache_free(s: nfs4_layout_cache, objp: new); |
448 | return nfserr; |
449 | } |
450 | |
451 | static void |
452 | nfsd4_free_layouts(struct list_head *reaplist) |
453 | { |
454 | while (!list_empty(head: reaplist)) { |
455 | struct nfs4_layout *lp = list_first_entry(reaplist, |
456 | struct nfs4_layout, lo_perstate); |
457 | |
458 | list_del(entry: &lp->lo_perstate); |
459 | nfs4_put_stid(s: &lp->lo_state->ls_stid); |
460 | kmem_cache_free(s: nfs4_layout_cache, objp: lp); |
461 | } |
462 | } |
463 | |
464 | static void |
465 | nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, |
466 | struct list_head *reaplist) |
467 | { |
468 | struct nfsd4_layout_seg *lo = &lp->lo_seg; |
469 | u64 end = layout_end(seg: lo); |
470 | |
471 | if (seg->offset <= lo->offset) { |
472 | if (layout_end(seg) >= end) { |
473 | list_move_tail(list: &lp->lo_perstate, head: reaplist); |
474 | return; |
475 | } |
476 | lo->offset = layout_end(seg); |
477 | } else { |
478 | /* retain the whole layout segment on a split. */ |
479 | if (layout_end(seg) < end) { |
480 | dprintk("%s: split not supported\n" , __func__); |
481 | return; |
482 | } |
483 | end = seg->offset; |
484 | } |
485 | |
486 | layout_update_len(lo, end); |
487 | } |
488 | |
489 | __be32 |
490 | nfsd4_return_file_layouts(struct svc_rqst *rqstp, |
491 | struct nfsd4_compound_state *cstate, |
492 | struct nfsd4_layoutreturn *lrp) |
493 | { |
494 | struct nfs4_layout_stateid *ls; |
495 | struct nfs4_layout *lp, *n; |
496 | LIST_HEAD(reaplist); |
497 | __be32 nfserr; |
498 | int found = 0; |
499 | |
500 | nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, stateid: &lrp->lr_sid, |
501 | create: false, layout_type: lrp->lr_layout_type, |
502 | lsp: &ls); |
503 | if (nfserr) { |
504 | trace_nfsd_layout_return_lookup_fail(stp: &lrp->lr_sid); |
505 | return nfserr; |
506 | } |
507 | |
508 | spin_lock(lock: &ls->ls_lock); |
509 | list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { |
510 | if (layouts_overlapping(lo: lp, s: &lrp->lr_seg)) { |
511 | nfsd4_return_file_layout(lp, seg: &lrp->lr_seg, reaplist: &reaplist); |
512 | found++; |
513 | } |
514 | } |
515 | if (!list_empty(head: &ls->ls_layouts)) { |
516 | if (found) |
517 | nfs4_inc_and_copy_stateid(dst: &lrp->lr_sid, stid: &ls->ls_stid); |
518 | lrp->lrs_present = true; |
519 | } else { |
520 | trace_nfsd_layoutstate_unhash(stp: &ls->ls_stid.sc_stateid); |
521 | nfs4_unhash_stid(s: &ls->ls_stid); |
522 | lrp->lrs_present = false; |
523 | } |
524 | spin_unlock(lock: &ls->ls_lock); |
525 | |
526 | mutex_unlock(lock: &ls->ls_mutex); |
527 | nfs4_put_stid(s: &ls->ls_stid); |
528 | nfsd4_free_layouts(reaplist: &reaplist); |
529 | return nfs_ok; |
530 | } |
531 | |
532 | __be32 |
533 | nfsd4_return_client_layouts(struct svc_rqst *rqstp, |
534 | struct nfsd4_compound_state *cstate, |
535 | struct nfsd4_layoutreturn *lrp) |
536 | { |
537 | struct nfs4_layout_stateid *ls, *n; |
538 | struct nfs4_client *clp = cstate->clp; |
539 | struct nfs4_layout *lp, *t; |
540 | LIST_HEAD(reaplist); |
541 | |
542 | lrp->lrs_present = false; |
543 | |
544 | spin_lock(lock: &clp->cl_lock); |
545 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { |
546 | if (ls->ls_layout_type != lrp->lr_layout_type) |
547 | continue; |
548 | |
549 | if (lrp->lr_return_type == RETURN_FSID && |
550 | !fh_fsid_match(fh1: &ls->ls_stid.sc_file->fi_fhandle, |
551 | fh2: &cstate->current_fh.fh_handle)) |
552 | continue; |
553 | |
554 | spin_lock(lock: &ls->ls_lock); |
555 | list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { |
556 | if (lrp->lr_seg.iomode == IOMODE_ANY || |
557 | lrp->lr_seg.iomode == lp->lo_seg.iomode) |
558 | list_move_tail(list: &lp->lo_perstate, head: &reaplist); |
559 | } |
560 | spin_unlock(lock: &ls->ls_lock); |
561 | } |
562 | spin_unlock(lock: &clp->cl_lock); |
563 | |
564 | nfsd4_free_layouts(reaplist: &reaplist); |
565 | return 0; |
566 | } |
567 | |
568 | static void |
569 | nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, |
570 | struct list_head *reaplist) |
571 | { |
572 | spin_lock(lock: &ls->ls_lock); |
573 | list_splice_init(list: &ls->ls_layouts, head: reaplist); |
574 | spin_unlock(lock: &ls->ls_lock); |
575 | } |
576 | |
577 | void |
578 | nfsd4_return_all_client_layouts(struct nfs4_client *clp) |
579 | { |
580 | struct nfs4_layout_stateid *ls, *n; |
581 | LIST_HEAD(reaplist); |
582 | |
583 | spin_lock(lock: &clp->cl_lock); |
584 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) |
585 | nfsd4_return_all_layouts(ls, reaplist: &reaplist); |
586 | spin_unlock(lock: &clp->cl_lock); |
587 | |
588 | nfsd4_free_layouts(reaplist: &reaplist); |
589 | } |
590 | |
591 | void |
592 | nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) |
593 | { |
594 | struct nfs4_layout_stateid *ls, *n; |
595 | LIST_HEAD(reaplist); |
596 | |
597 | spin_lock(lock: &fp->fi_lock); |
598 | list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { |
599 | if (ls->ls_stid.sc_client == clp) |
600 | nfsd4_return_all_layouts(ls, reaplist: &reaplist); |
601 | } |
602 | spin_unlock(lock: &fp->fi_lock); |
603 | |
604 | nfsd4_free_layouts(reaplist: &reaplist); |
605 | } |
606 | |
607 | static void |
608 | nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls) |
609 | { |
610 | struct nfs4_client *clp = ls->ls_stid.sc_client; |
611 | char addr_str[INET6_ADDRSTRLEN]; |
612 | static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed" ; |
613 | static char *envp[] = { |
614 | "HOME=/" , |
615 | "TERM=linux" , |
616 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin" , |
617 | NULL |
618 | }; |
619 | char *argv[8]; |
620 | int error; |
621 | |
622 | rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); |
623 | |
624 | printk(KERN_WARNING |
625 | "nfsd: client %s failed to respond to layout recall. " |
626 | " Fencing..\n" , addr_str); |
627 | |
628 | argv[0] = (char *)nfsd_recall_failed; |
629 | argv[1] = addr_str; |
630 | argv[2] = ls->ls_file->nf_file->f_path.mnt->mnt_sb->s_id; |
631 | argv[3] = NULL; |
632 | |
633 | error = call_usermodehelper(path: nfsd_recall_failed, argv, envp, |
634 | UMH_WAIT_PROC); |
635 | if (error) { |
636 | printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n" , |
637 | addr_str, error); |
638 | } |
639 | } |
640 | |
641 | static void |
642 | nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) |
643 | { |
644 | struct nfs4_layout_stateid *ls = |
645 | container_of(cb, struct nfs4_layout_stateid, ls_recall); |
646 | |
647 | mutex_lock(&ls->ls_mutex); |
648 | nfs4_inc_and_copy_stateid(dst: &ls->ls_recall_sid, stid: &ls->ls_stid); |
649 | mutex_unlock(lock: &ls->ls_mutex); |
650 | } |
651 | |
652 | static int |
653 | nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) |
654 | { |
655 | struct nfs4_layout_stateid *ls = |
656 | container_of(cb, struct nfs4_layout_stateid, ls_recall); |
657 | struct nfsd_net *nn; |
658 | ktime_t now, cutoff; |
659 | const struct nfsd4_layout_ops *ops; |
660 | |
661 | trace_nfsd_cb_layout_done(stp: &ls->ls_stid.sc_stateid, task); |
662 | switch (task->tk_status) { |
663 | case 0: |
664 | case -NFS4ERR_DELAY: |
665 | /* |
666 | * Anything left? If not, then call it done. Note that we don't |
667 | * take the spinlock since this is an optimization and nothing |
668 | * should get added until the cb counter goes to zero. |
669 | */ |
670 | if (list_empty(head: &ls->ls_layouts)) |
671 | return 1; |
672 | |
673 | /* Poll the client until it's done with the layout */ |
674 | now = ktime_get(); |
675 | nn = net_generic(net: ls->ls_stid.sc_client->net, id: nfsd_net_id); |
676 | |
677 | /* Client gets 2 lease periods to return it */ |
678 | cutoff = ktime_add_ns(task->tk_start, |
679 | (u64)nn->nfsd4_lease * NSEC_PER_SEC * 2); |
680 | |
681 | if (ktime_before(cmp1: now, cmp2: cutoff)) { |
682 | rpc_delay(task, HZ/100); /* 10 mili-seconds */ |
683 | return 0; |
684 | } |
685 | fallthrough; |
686 | default: |
687 | /* |
688 | * Unknown error or non-responding client, we'll need to fence. |
689 | */ |
690 | trace_nfsd_layout_recall_fail(stp: &ls->ls_stid.sc_stateid); |
691 | |
692 | ops = nfsd4_layout_ops[ls->ls_layout_type]; |
693 | if (ops->fence_client) |
694 | ops->fence_client(ls); |
695 | else |
696 | nfsd4_cb_layout_fail(ls); |
697 | return 1; |
698 | case -NFS4ERR_NOMATCHING_LAYOUT: |
699 | trace_nfsd_layout_recall_done(stp: &ls->ls_stid.sc_stateid); |
700 | task->tk_status = 0; |
701 | return 1; |
702 | } |
703 | } |
704 | |
705 | static void |
706 | nfsd4_cb_layout_release(struct nfsd4_callback *cb) |
707 | { |
708 | struct nfs4_layout_stateid *ls = |
709 | container_of(cb, struct nfs4_layout_stateid, ls_recall); |
710 | LIST_HEAD(reaplist); |
711 | |
712 | trace_nfsd_layout_recall_release(stp: &ls->ls_stid.sc_stateid); |
713 | |
714 | nfsd4_return_all_layouts(ls, reaplist: &reaplist); |
715 | nfsd4_free_layouts(reaplist: &reaplist); |
716 | nfs4_put_stid(s: &ls->ls_stid); |
717 | } |
718 | |
719 | static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { |
720 | .prepare = nfsd4_cb_layout_prepare, |
721 | .done = nfsd4_cb_layout_done, |
722 | .release = nfsd4_cb_layout_release, |
723 | }; |
724 | |
725 | static bool |
726 | nfsd4_layout_lm_break(struct file_lock *fl) |
727 | { |
728 | /* |
729 | * We don't want the locks code to timeout the lease for us; |
730 | * we'll remove it ourself if a layout isn't returned |
731 | * in time: |
732 | */ |
733 | fl->fl_break_time = 0; |
734 | nfsd4_recall_file_layout(ls: fl->fl_owner); |
735 | return false; |
736 | } |
737 | |
738 | static int |
739 | nfsd4_layout_lm_change(struct file_lock *onlist, int arg, |
740 | struct list_head *dispose) |
741 | { |
742 | BUG_ON(!(arg & F_UNLCK)); |
743 | return lease_modify(onlist, arg, dispose); |
744 | } |
745 | |
746 | static const struct lock_manager_operations nfsd4_layouts_lm_ops = { |
747 | .lm_break = nfsd4_layout_lm_break, |
748 | .lm_change = nfsd4_layout_lm_change, |
749 | }; |
750 | |
751 | int |
752 | nfsd4_init_pnfs(void) |
753 | { |
754 | int i; |
755 | |
756 | for (i = 0; i < DEVID_HASH_SIZE; i++) |
757 | INIT_LIST_HEAD(list: &nfsd_devid_hash[i]); |
758 | |
759 | nfs4_layout_cache = kmem_cache_create(name: "nfs4_layout" , |
760 | size: sizeof(struct nfs4_layout), align: 0, flags: 0, NULL); |
761 | if (!nfs4_layout_cache) |
762 | return -ENOMEM; |
763 | |
764 | nfs4_layout_stateid_cache = kmem_cache_create(name: "nfs4_layout_stateid" , |
765 | size: sizeof(struct nfs4_layout_stateid), align: 0, flags: 0, NULL); |
766 | if (!nfs4_layout_stateid_cache) { |
767 | kmem_cache_destroy(s: nfs4_layout_cache); |
768 | return -ENOMEM; |
769 | } |
770 | return 0; |
771 | } |
772 | |
773 | void |
774 | nfsd4_exit_pnfs(void) |
775 | { |
776 | int i; |
777 | |
778 | kmem_cache_destroy(s: nfs4_layout_cache); |
779 | kmem_cache_destroy(s: nfs4_layout_stateid_cache); |
780 | |
781 | for (i = 0; i < DEVID_HASH_SIZE; i++) { |
782 | struct nfsd4_deviceid_map *map, *n; |
783 | |
784 | list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) |
785 | kfree(objp: map); |
786 | } |
787 | } |
788 | |