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9cf514cc CH |
1 | /* |
2 | * Copyright (c) 2014 Christoph Hellwig. | |
3 | */ | |
c5c707f9 CH |
4 | #include <linux/kmod.h> |
5 | #include <linux/file.h> | |
9cf514cc CH |
6 | #include <linux/jhash.h> |
7 | #include <linux/sched.h> | |
c5c707f9 | 8 | #include <linux/sunrpc/addr.h> |
9cf514cc CH |
9 | |
10 | #include "pnfs.h" | |
11 | #include "netns.h" | |
31ef83dc | 12 | #include "trace.h" |
9cf514cc CH |
13 | |
14 | #define NFSDDBG_FACILITY NFSDDBG_PNFS | |
15 | ||
16 | struct nfs4_layout { | |
17 | struct list_head lo_perstate; | |
18 | struct nfs4_layout_stateid *lo_state; | |
19 | struct nfsd4_layout_seg lo_seg; | |
20 | }; | |
21 | ||
22 | static struct kmem_cache *nfs4_layout_cache; | |
23 | static struct kmem_cache *nfs4_layout_stateid_cache; | |
24 | ||
c5c707f9 CH |
25 | static struct nfsd4_callback_ops nfsd4_cb_layout_ops; |
26 | static const struct lock_manager_operations nfsd4_layouts_lm_ops; | |
27 | ||
9cf514cc | 28 | const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = { |
8650b8a0 | 29 | [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops, |
9cf514cc CH |
30 | }; |
31 | ||
32 | /* pNFS device ID to export fsid mapping */ | |
33 | #define DEVID_HASH_BITS 8 | |
34 | #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS) | |
35 | #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1) | |
36 | static u64 nfsd_devid_seq = 1; | |
37 | static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE]; | |
38 | static DEFINE_SPINLOCK(nfsd_devid_lock); | |
39 | ||
40 | static inline u32 devid_hashfn(u64 idx) | |
41 | { | |
42 | return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK; | |
43 | } | |
44 | ||
45 | static void | |
46 | nfsd4_alloc_devid_map(const struct svc_fh *fhp) | |
47 | { | |
48 | const struct knfsd_fh *fh = &fhp->fh_handle; | |
49 | size_t fsid_len = key_len(fh->fh_fsid_type); | |
50 | struct nfsd4_deviceid_map *map, *old; | |
51 | int i; | |
52 | ||
53 | map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL); | |
54 | if (!map) | |
55 | return; | |
56 | ||
57 | map->fsid_type = fh->fh_fsid_type; | |
58 | memcpy(&map->fsid, fh->fh_fsid, fsid_len); | |
59 | ||
60 | spin_lock(&nfsd_devid_lock); | |
61 | if (fhp->fh_export->ex_devid_map) | |
62 | goto out_unlock; | |
63 | ||
64 | for (i = 0; i < DEVID_HASH_SIZE; i++) { | |
65 | list_for_each_entry(old, &nfsd_devid_hash[i], hash) { | |
66 | if (old->fsid_type != fh->fh_fsid_type) | |
67 | continue; | |
68 | if (memcmp(old->fsid, fh->fh_fsid, | |
69 | key_len(old->fsid_type))) | |
70 | continue; | |
71 | ||
72 | fhp->fh_export->ex_devid_map = old; | |
73 | goto out_unlock; | |
74 | } | |
75 | } | |
76 | ||
77 | map->idx = nfsd_devid_seq++; | |
78 | list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]); | |
79 | fhp->fh_export->ex_devid_map = map; | |
80 | map = NULL; | |
81 | ||
82 | out_unlock: | |
83 | spin_unlock(&nfsd_devid_lock); | |
84 | kfree(map); | |
85 | } | |
86 | ||
87 | struct nfsd4_deviceid_map * | |
88 | nfsd4_find_devid_map(int idx) | |
89 | { | |
90 | struct nfsd4_deviceid_map *map, *ret = NULL; | |
91 | ||
92 | rcu_read_lock(); | |
93 | list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash) | |
94 | if (map->idx == idx) | |
95 | ret = map; | |
96 | rcu_read_unlock(); | |
97 | ||
98 | return ret; | |
99 | } | |
100 | ||
101 | int | |
102 | nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp, | |
103 | u32 device_generation) | |
104 | { | |
105 | if (!fhp->fh_export->ex_devid_map) { | |
106 | nfsd4_alloc_devid_map(fhp); | |
107 | if (!fhp->fh_export->ex_devid_map) | |
108 | return -ENOMEM; | |
109 | } | |
110 | ||
111 | id->fsid_idx = fhp->fh_export->ex_devid_map->idx; | |
112 | id->generation = device_generation; | |
113 | id->pad = 0; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | void nfsd4_setup_layout_type(struct svc_export *exp) | |
118 | { | |
8650b8a0 CH |
119 | struct super_block *sb = exp->ex_path.mnt->mnt_sb; |
120 | ||
9cf514cc CH |
121 | if (exp->ex_flags & NFSEXP_NOPNFS) |
122 | return; | |
8650b8a0 CH |
123 | |
124 | if (sb->s_export_op->get_uuid && | |
125 | sb->s_export_op->map_blocks && | |
126 | sb->s_export_op->commit_blocks) | |
127 | exp->ex_layout_type = LAYOUT_BLOCK_VOLUME; | |
9cf514cc CH |
128 | } |
129 | ||
130 | static void | |
131 | nfsd4_free_layout_stateid(struct nfs4_stid *stid) | |
132 | { | |
133 | struct nfs4_layout_stateid *ls = layoutstateid(stid); | |
134 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
135 | struct nfs4_file *fp = ls->ls_stid.sc_file; | |
136 | ||
31ef83dc CH |
137 | trace_layoutstate_free(&ls->ls_stid.sc_stateid); |
138 | ||
9cf514cc CH |
139 | spin_lock(&clp->cl_lock); |
140 | list_del_init(&ls->ls_perclnt); | |
141 | spin_unlock(&clp->cl_lock); | |
142 | ||
143 | spin_lock(&fp->fi_lock); | |
144 | list_del_init(&ls->ls_perfile); | |
145 | spin_unlock(&fp->fi_lock); | |
146 | ||
c5c707f9 CH |
147 | vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls); |
148 | fput(ls->ls_file); | |
149 | ||
150 | if (ls->ls_recalled) | |
151 | atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); | |
152 | ||
9cf514cc CH |
153 | kmem_cache_free(nfs4_layout_stateid_cache, ls); |
154 | } | |
155 | ||
c5c707f9 CH |
156 | static int |
157 | nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) | |
158 | { | |
159 | struct file_lock *fl; | |
160 | int status; | |
161 | ||
162 | fl = locks_alloc_lock(); | |
163 | if (!fl) | |
164 | return -ENOMEM; | |
165 | locks_init_lock(fl); | |
166 | fl->fl_lmops = &nfsd4_layouts_lm_ops; | |
167 | fl->fl_flags = FL_LAYOUT; | |
168 | fl->fl_type = F_RDLCK; | |
169 | fl->fl_end = OFFSET_MAX; | |
170 | fl->fl_owner = ls; | |
171 | fl->fl_pid = current->tgid; | |
172 | fl->fl_file = ls->ls_file; | |
173 | ||
174 | status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); | |
175 | if (status) { | |
176 | locks_free_lock(fl); | |
177 | return status; | |
178 | } | |
179 | BUG_ON(fl != NULL); | |
180 | return 0; | |
181 | } | |
182 | ||
9cf514cc CH |
183 | static struct nfs4_layout_stateid * |
184 | nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, | |
185 | struct nfs4_stid *parent, u32 layout_type) | |
186 | { | |
187 | struct nfs4_client *clp = cstate->clp; | |
188 | struct nfs4_file *fp = parent->sc_file; | |
189 | struct nfs4_layout_stateid *ls; | |
190 | struct nfs4_stid *stp; | |
191 | ||
192 | stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache); | |
193 | if (!stp) | |
194 | return NULL; | |
195 | stp->sc_free = nfsd4_free_layout_stateid; | |
196 | get_nfs4_file(fp); | |
197 | stp->sc_file = fp; | |
198 | ||
199 | ls = layoutstateid(stp); | |
200 | INIT_LIST_HEAD(&ls->ls_perclnt); | |
201 | INIT_LIST_HEAD(&ls->ls_perfile); | |
202 | spin_lock_init(&ls->ls_lock); | |
203 | INIT_LIST_HEAD(&ls->ls_layouts); | |
204 | ls->ls_layout_type = layout_type; | |
c5c707f9 CH |
205 | nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, |
206 | NFSPROC4_CLNT_CB_LAYOUT); | |
207 | ||
208 | if (parent->sc_type == NFS4_DELEG_STID) | |
209 | ls->ls_file = get_file(fp->fi_deleg_file); | |
210 | else | |
211 | ls->ls_file = find_any_file(fp); | |
212 | BUG_ON(!ls->ls_file); | |
213 | ||
214 | if (nfsd4_layout_setlease(ls)) { | |
215 | put_nfs4_file(fp); | |
216 | kmem_cache_free(nfs4_layout_stateid_cache, ls); | |
217 | return NULL; | |
218 | } | |
9cf514cc CH |
219 | |
220 | spin_lock(&clp->cl_lock); | |
221 | stp->sc_type = NFS4_LAYOUT_STID; | |
222 | list_add(&ls->ls_perclnt, &clp->cl_lo_states); | |
223 | spin_unlock(&clp->cl_lock); | |
224 | ||
225 | spin_lock(&fp->fi_lock); | |
226 | list_add(&ls->ls_perfile, &fp->fi_lo_states); | |
227 | spin_unlock(&fp->fi_lock); | |
228 | ||
31ef83dc | 229 | trace_layoutstate_alloc(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
230 | return ls; |
231 | } | |
232 | ||
233 | __be32 | |
234 | nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, | |
235 | struct nfsd4_compound_state *cstate, stateid_t *stateid, | |
236 | bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) | |
237 | { | |
238 | struct nfs4_layout_stateid *ls; | |
239 | struct nfs4_stid *stid; | |
240 | unsigned char typemask = NFS4_LAYOUT_STID; | |
241 | __be32 status; | |
242 | ||
243 | if (create) | |
244 | typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); | |
245 | ||
246 | status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid, | |
247 | net_generic(SVC_NET(rqstp), nfsd_net_id)); | |
248 | if (status) | |
249 | goto out; | |
250 | ||
251 | if (!fh_match(&cstate->current_fh.fh_handle, | |
252 | &stid->sc_file->fi_fhandle)) { | |
253 | status = nfserr_bad_stateid; | |
254 | goto out_put_stid; | |
255 | } | |
256 | ||
257 | if (stid->sc_type != NFS4_LAYOUT_STID) { | |
258 | ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type); | |
259 | nfs4_put_stid(stid); | |
260 | ||
261 | status = nfserr_jukebox; | |
262 | if (!ls) | |
263 | goto out; | |
264 | } else { | |
265 | ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); | |
266 | ||
267 | status = nfserr_bad_stateid; | |
268 | if (stateid->si_generation > stid->sc_stateid.si_generation) | |
269 | goto out_put_stid; | |
270 | if (layout_type != ls->ls_layout_type) | |
271 | goto out_put_stid; | |
272 | } | |
273 | ||
274 | *lsp = ls; | |
275 | return 0; | |
276 | ||
277 | out_put_stid: | |
278 | nfs4_put_stid(stid); | |
279 | out: | |
280 | return status; | |
281 | } | |
282 | ||
c5c707f9 CH |
283 | static void |
284 | nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) | |
285 | { | |
286 | spin_lock(&ls->ls_lock); | |
287 | if (ls->ls_recalled) | |
288 | goto out_unlock; | |
289 | ||
290 | ls->ls_recalled = true; | |
291 | atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); | |
292 | if (list_empty(&ls->ls_layouts)) | |
293 | goto out_unlock; | |
294 | ||
31ef83dc CH |
295 | trace_layout_recall(&ls->ls_stid.sc_stateid); |
296 | ||
c5c707f9 CH |
297 | atomic_inc(&ls->ls_stid.sc_count); |
298 | update_stateid(&ls->ls_stid.sc_stateid); | |
299 | memcpy(&ls->ls_recall_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t)); | |
300 | nfsd4_run_cb(&ls->ls_recall); | |
301 | ||
302 | out_unlock: | |
303 | spin_unlock(&ls->ls_lock); | |
304 | } | |
305 | ||
9cf514cc CH |
306 | static inline u64 |
307 | layout_end(struct nfsd4_layout_seg *seg) | |
308 | { | |
309 | u64 end = seg->offset + seg->length; | |
310 | return end >= seg->offset ? end : NFS4_MAX_UINT64; | |
311 | } | |
312 | ||
313 | static void | |
314 | layout_update_len(struct nfsd4_layout_seg *lo, u64 end) | |
315 | { | |
316 | if (end == NFS4_MAX_UINT64) | |
317 | lo->length = NFS4_MAX_UINT64; | |
318 | else | |
319 | lo->length = end - lo->offset; | |
320 | } | |
321 | ||
322 | static bool | |
323 | layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) | |
324 | { | |
325 | if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) | |
326 | return false; | |
327 | if (layout_end(&lo->lo_seg) <= s->offset) | |
328 | return false; | |
329 | if (layout_end(s) <= lo->lo_seg.offset) | |
330 | return false; | |
331 | return true; | |
332 | } | |
333 | ||
334 | static bool | |
335 | layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) | |
336 | { | |
337 | if (lo->iomode != new->iomode) | |
338 | return false; | |
339 | if (layout_end(new) < lo->offset) | |
340 | return false; | |
341 | if (layout_end(lo) < new->offset) | |
342 | return false; | |
343 | ||
344 | lo->offset = min(lo->offset, new->offset); | |
345 | layout_update_len(lo, max(layout_end(lo), layout_end(new))); | |
346 | return true; | |
347 | } | |
348 | ||
c5c707f9 CH |
349 | static __be32 |
350 | nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) | |
351 | { | |
352 | struct nfs4_file *fp = ls->ls_stid.sc_file; | |
353 | struct nfs4_layout_stateid *l, *n; | |
354 | __be32 nfserr = nfs_ok; | |
355 | ||
356 | assert_spin_locked(&fp->fi_lock); | |
357 | ||
358 | list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { | |
359 | if (l != ls) { | |
360 | nfsd4_recall_file_layout(l); | |
361 | nfserr = nfserr_recallconflict; | |
362 | } | |
363 | } | |
364 | ||
365 | return nfserr; | |
366 | } | |
367 | ||
9cf514cc CH |
368 | __be32 |
369 | nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) | |
370 | { | |
371 | struct nfsd4_layout_seg *seg = &lgp->lg_seg; | |
c5c707f9 | 372 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
9cf514cc | 373 | struct nfs4_layout *lp, *new = NULL; |
c5c707f9 | 374 | __be32 nfserr; |
9cf514cc | 375 | |
c5c707f9 CH |
376 | spin_lock(&fp->fi_lock); |
377 | nfserr = nfsd4_recall_conflict(ls); | |
378 | if (nfserr) | |
379 | goto out; | |
9cf514cc CH |
380 | spin_lock(&ls->ls_lock); |
381 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
382 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
383 | goto done; | |
384 | } | |
385 | spin_unlock(&ls->ls_lock); | |
c5c707f9 | 386 | spin_unlock(&fp->fi_lock); |
9cf514cc CH |
387 | |
388 | new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); | |
389 | if (!new) | |
390 | return nfserr_jukebox; | |
391 | memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg)); | |
392 | new->lo_state = ls; | |
393 | ||
c5c707f9 CH |
394 | spin_lock(&fp->fi_lock); |
395 | nfserr = nfsd4_recall_conflict(ls); | |
396 | if (nfserr) | |
397 | goto out; | |
9cf514cc CH |
398 | spin_lock(&ls->ls_lock); |
399 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
400 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
401 | goto done; | |
402 | } | |
403 | ||
404 | atomic_inc(&ls->ls_stid.sc_count); | |
405 | list_add_tail(&new->lo_perstate, &ls->ls_layouts); | |
406 | new = NULL; | |
407 | done: | |
408 | update_stateid(&ls->ls_stid.sc_stateid); | |
409 | memcpy(&lgp->lg_sid, &ls->ls_stid.sc_stateid, sizeof(stateid_t)); | |
410 | spin_unlock(&ls->ls_lock); | |
c5c707f9 CH |
411 | out: |
412 | spin_unlock(&fp->fi_lock); | |
9cf514cc CH |
413 | if (new) |
414 | kmem_cache_free(nfs4_layout_cache, new); | |
c5c707f9 | 415 | return nfserr; |
9cf514cc CH |
416 | } |
417 | ||
418 | static void | |
419 | nfsd4_free_layouts(struct list_head *reaplist) | |
420 | { | |
421 | while (!list_empty(reaplist)) { | |
422 | struct nfs4_layout *lp = list_first_entry(reaplist, | |
423 | struct nfs4_layout, lo_perstate); | |
424 | ||
425 | list_del(&lp->lo_perstate); | |
426 | nfs4_put_stid(&lp->lo_state->ls_stid); | |
427 | kmem_cache_free(nfs4_layout_cache, lp); | |
428 | } | |
429 | } | |
430 | ||
431 | static void | |
432 | nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, | |
433 | struct list_head *reaplist) | |
434 | { | |
435 | struct nfsd4_layout_seg *lo = &lp->lo_seg; | |
436 | u64 end = layout_end(lo); | |
437 | ||
438 | if (seg->offset <= lo->offset) { | |
439 | if (layout_end(seg) >= end) { | |
440 | list_move_tail(&lp->lo_perstate, reaplist); | |
441 | return; | |
442 | } | |
443 | end = seg->offset; | |
444 | } else { | |
445 | /* retain the whole layout segment on a split. */ | |
446 | if (layout_end(seg) < end) { | |
447 | dprintk("%s: split not supported\n", __func__); | |
448 | return; | |
449 | } | |
450 | ||
451 | lo->offset = layout_end(seg); | |
452 | } | |
453 | ||
454 | layout_update_len(lo, end); | |
455 | } | |
456 | ||
457 | __be32 | |
458 | nfsd4_return_file_layouts(struct svc_rqst *rqstp, | |
459 | struct nfsd4_compound_state *cstate, | |
460 | struct nfsd4_layoutreturn *lrp) | |
461 | { | |
462 | struct nfs4_layout_stateid *ls; | |
463 | struct nfs4_layout *lp, *n; | |
464 | LIST_HEAD(reaplist); | |
465 | __be32 nfserr; | |
466 | int found = 0; | |
467 | ||
468 | nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid, | |
469 | false, lrp->lr_layout_type, | |
470 | &ls); | |
31ef83dc CH |
471 | if (nfserr) { |
472 | trace_layout_return_lookup_fail(&lrp->lr_sid); | |
9cf514cc | 473 | return nfserr; |
31ef83dc | 474 | } |
9cf514cc CH |
475 | |
476 | spin_lock(&ls->ls_lock); | |
477 | list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { | |
478 | if (layouts_overlapping(lp, &lrp->lr_seg)) { | |
479 | nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); | |
480 | found++; | |
481 | } | |
482 | } | |
483 | if (!list_empty(&ls->ls_layouts)) { | |
484 | if (found) { | |
485 | update_stateid(&ls->ls_stid.sc_stateid); | |
486 | memcpy(&lrp->lr_sid, &ls->ls_stid.sc_stateid, | |
487 | sizeof(stateid_t)); | |
488 | } | |
489 | lrp->lrs_present = 1; | |
490 | } else { | |
31ef83dc | 491 | trace_layoutstate_unhash(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
492 | nfs4_unhash_stid(&ls->ls_stid); |
493 | lrp->lrs_present = 0; | |
494 | } | |
495 | spin_unlock(&ls->ls_lock); | |
496 | ||
497 | nfs4_put_stid(&ls->ls_stid); | |
498 | nfsd4_free_layouts(&reaplist); | |
499 | return nfs_ok; | |
500 | } | |
501 | ||
502 | __be32 | |
503 | nfsd4_return_client_layouts(struct svc_rqst *rqstp, | |
504 | struct nfsd4_compound_state *cstate, | |
505 | struct nfsd4_layoutreturn *lrp) | |
506 | { | |
507 | struct nfs4_layout_stateid *ls, *n; | |
508 | struct nfs4_client *clp = cstate->clp; | |
509 | struct nfs4_layout *lp, *t; | |
510 | LIST_HEAD(reaplist); | |
511 | ||
512 | lrp->lrs_present = 0; | |
513 | ||
514 | spin_lock(&clp->cl_lock); | |
515 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { | |
516 | if (lrp->lr_return_type == RETURN_FSID && | |
517 | !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, | |
518 | &cstate->current_fh.fh_handle)) | |
519 | continue; | |
520 | ||
521 | spin_lock(&ls->ls_lock); | |
522 | list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { | |
523 | if (lrp->lr_seg.iomode == IOMODE_ANY || | |
524 | lrp->lr_seg.iomode == lp->lo_seg.iomode) | |
525 | list_move_tail(&lp->lo_perstate, &reaplist); | |
526 | } | |
527 | spin_unlock(&ls->ls_lock); | |
528 | } | |
529 | spin_unlock(&clp->cl_lock); | |
530 | ||
531 | nfsd4_free_layouts(&reaplist); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | static void | |
536 | nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, | |
537 | struct list_head *reaplist) | |
538 | { | |
539 | spin_lock(&ls->ls_lock); | |
540 | list_splice_init(&ls->ls_layouts, reaplist); | |
541 | spin_unlock(&ls->ls_lock); | |
542 | } | |
543 | ||
544 | void | |
545 | nfsd4_return_all_client_layouts(struct nfs4_client *clp) | |
546 | { | |
547 | struct nfs4_layout_stateid *ls, *n; | |
548 | LIST_HEAD(reaplist); | |
549 | ||
550 | spin_lock(&clp->cl_lock); | |
551 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) | |
552 | nfsd4_return_all_layouts(ls, &reaplist); | |
553 | spin_unlock(&clp->cl_lock); | |
554 | ||
555 | nfsd4_free_layouts(&reaplist); | |
556 | } | |
557 | ||
558 | void | |
559 | nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) | |
560 | { | |
561 | struct nfs4_layout_stateid *ls, *n; | |
562 | LIST_HEAD(reaplist); | |
563 | ||
564 | spin_lock(&fp->fi_lock); | |
565 | list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { | |
566 | if (ls->ls_stid.sc_client == clp) | |
567 | nfsd4_return_all_layouts(ls, &reaplist); | |
568 | } | |
569 | spin_unlock(&fp->fi_lock); | |
570 | ||
571 | nfsd4_free_layouts(&reaplist); | |
572 | } | |
573 | ||
c5c707f9 CH |
574 | static void |
575 | nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls) | |
576 | { | |
577 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
578 | char addr_str[INET6_ADDRSTRLEN]; | |
579 | static char *envp[] = { | |
580 | "HOME=/", | |
581 | "TERM=linux", | |
582 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
583 | NULL | |
584 | }; | |
585 | char *argv[8]; | |
586 | int error; | |
587 | ||
588 | rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); | |
589 | ||
715a03d2 KM |
590 | trace_layout_recall_fail(&ls->ls_stid.sc_stateid); |
591 | ||
c5c707f9 CH |
592 | printk(KERN_WARNING |
593 | "nfsd: client %s failed to respond to layout recall. " | |
594 | " Fencing..\n", addr_str); | |
595 | ||
596 | argv[0] = "/sbin/nfsd-recall-failed"; | |
597 | argv[1] = addr_str; | |
598 | argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id; | |
599 | argv[3] = NULL; | |
600 | ||
601 | error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
602 | if (error) { | |
603 | printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", | |
604 | addr_str, error); | |
605 | } | |
606 | } | |
607 | ||
608 | static int | |
609 | nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) | |
610 | { | |
611 | struct nfs4_layout_stateid *ls = | |
612 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
613 | LIST_HEAD(reaplist); | |
614 | ||
615 | switch (task->tk_status) { | |
616 | case 0: | |
617 | return 1; | |
618 | case -NFS4ERR_NOMATCHING_LAYOUT: | |
31ef83dc | 619 | trace_layout_recall_done(&ls->ls_stid.sc_stateid); |
c5c707f9 CH |
620 | task->tk_status = 0; |
621 | return 1; | |
622 | case -NFS4ERR_DELAY: | |
623 | /* Poll the client until it's done with the layout */ | |
624 | /* FIXME: cap number of retries. | |
625 | * The pnfs standard states that we need to only expire | |
626 | * the client after at-least "lease time" .eg lease-time * 2 | |
627 | * when failing to communicate a recall | |
628 | */ | |
629 | rpc_delay(task, HZ/100); /* 10 mili-seconds */ | |
630 | return 0; | |
631 | default: | |
632 | /* | |
633 | * Unknown error or non-responding client, we'll need to fence. | |
634 | */ | |
635 | nfsd4_cb_layout_fail(ls); | |
636 | return -1; | |
637 | } | |
638 | } | |
639 | ||
640 | static void | |
641 | nfsd4_cb_layout_release(struct nfsd4_callback *cb) | |
642 | { | |
643 | struct nfs4_layout_stateid *ls = | |
644 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
645 | LIST_HEAD(reaplist); | |
646 | ||
31ef83dc CH |
647 | trace_layout_recall_release(&ls->ls_stid.sc_stateid); |
648 | ||
c5c707f9 CH |
649 | nfsd4_return_all_layouts(ls, &reaplist); |
650 | nfsd4_free_layouts(&reaplist); | |
651 | nfs4_put_stid(&ls->ls_stid); | |
652 | } | |
653 | ||
654 | static struct nfsd4_callback_ops nfsd4_cb_layout_ops = { | |
655 | .done = nfsd4_cb_layout_done, | |
656 | .release = nfsd4_cb_layout_release, | |
657 | }; | |
658 | ||
659 | static bool | |
660 | nfsd4_layout_lm_break(struct file_lock *fl) | |
661 | { | |
662 | /* | |
663 | * We don't want the locks code to timeout the lease for us; | |
664 | * we'll remove it ourself if a layout isn't returned | |
665 | * in time: | |
666 | */ | |
667 | fl->fl_break_time = 0; | |
668 | nfsd4_recall_file_layout(fl->fl_owner); | |
669 | return false; | |
670 | } | |
671 | ||
672 | static int | |
673 | nfsd4_layout_lm_change(struct file_lock *onlist, int arg, | |
674 | struct list_head *dispose) | |
675 | { | |
676 | BUG_ON(!(arg & F_UNLCK)); | |
677 | return lease_modify(onlist, arg, dispose); | |
678 | } | |
679 | ||
680 | static const struct lock_manager_operations nfsd4_layouts_lm_ops = { | |
681 | .lm_break = nfsd4_layout_lm_break, | |
682 | .lm_change = nfsd4_layout_lm_change, | |
683 | }; | |
684 | ||
9cf514cc CH |
685 | int |
686 | nfsd4_init_pnfs(void) | |
687 | { | |
688 | int i; | |
689 | ||
690 | for (i = 0; i < DEVID_HASH_SIZE; i++) | |
691 | INIT_LIST_HEAD(&nfsd_devid_hash[i]); | |
692 | ||
693 | nfs4_layout_cache = kmem_cache_create("nfs4_layout", | |
694 | sizeof(struct nfs4_layout), 0, 0, NULL); | |
695 | if (!nfs4_layout_cache) | |
696 | return -ENOMEM; | |
697 | ||
698 | nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid", | |
699 | sizeof(struct nfs4_layout_stateid), 0, 0, NULL); | |
700 | if (!nfs4_layout_stateid_cache) { | |
701 | kmem_cache_destroy(nfs4_layout_cache); | |
702 | return -ENOMEM; | |
703 | } | |
704 | return 0; | |
705 | } | |
706 | ||
707 | void | |
708 | nfsd4_exit_pnfs(void) | |
709 | { | |
710 | int i; | |
711 | ||
712 | kmem_cache_destroy(nfs4_layout_cache); | |
713 | kmem_cache_destroy(nfs4_layout_stateid_cache); | |
714 | ||
715 | for (i = 0; i < DEVID_HASH_SIZE; i++) { | |
716 | struct nfsd4_deviceid_map *map, *n; | |
717 | ||
718 | list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) | |
719 | kfree(map); | |
720 | } | |
721 | } |