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Commit | Line | Data |
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9cf514cc CH |
1 | /* |
2 | * Copyright (c) 2014 Christoph Hellwig. | |
3 | */ | |
f99d4fbd | 4 | #include <linux/blkdev.h> |
c5c707f9 CH |
5 | #include <linux/kmod.h> |
6 | #include <linux/file.h> | |
9cf514cc CH |
7 | #include <linux/jhash.h> |
8 | #include <linux/sched.h> | |
c5c707f9 | 9 | #include <linux/sunrpc/addr.h> |
9cf514cc CH |
10 | |
11 | #include "pnfs.h" | |
12 | #include "netns.h" | |
31ef83dc | 13 | #include "trace.h" |
9cf514cc CH |
14 | |
15 | #define NFSDDBG_FACILITY NFSDDBG_PNFS | |
16 | ||
17 | struct nfs4_layout { | |
18 | struct list_head lo_perstate; | |
19 | struct nfs4_layout_stateid *lo_state; | |
20 | struct nfsd4_layout_seg lo_seg; | |
21 | }; | |
22 | ||
23 | static struct kmem_cache *nfs4_layout_cache; | |
24 | static struct kmem_cache *nfs4_layout_stateid_cache; | |
25 | ||
c4cb8974 | 26 | static const struct nfsd4_callback_ops nfsd4_cb_layout_ops; |
c5c707f9 CH |
27 | static const struct lock_manager_operations nfsd4_layouts_lm_ops; |
28 | ||
9cf514cc | 29 | const struct nfsd4_layout_ops *nfsd4_layout_ops[LAYOUT_TYPE_MAX] = { |
9b9960a0 TH |
30 | #ifdef CONFIG_NFSD_FLEXFILELAYOUT |
31 | [LAYOUT_FLEX_FILES] = &ff_layout_ops, | |
32 | #endif | |
81c39329 | 33 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
8650b8a0 | 34 | [LAYOUT_BLOCK_VOLUME] = &bl_layout_ops, |
81c39329 | 35 | #endif |
f99d4fbd CH |
36 | #ifdef CONFIG_NFSD_SCSILAYOUT |
37 | [LAYOUT_SCSI] = &scsi_layout_ops, | |
38 | #endif | |
9cf514cc CH |
39 | }; |
40 | ||
41 | /* pNFS device ID to export fsid mapping */ | |
42 | #define DEVID_HASH_BITS 8 | |
43 | #define DEVID_HASH_SIZE (1 << DEVID_HASH_BITS) | |
44 | #define DEVID_HASH_MASK (DEVID_HASH_SIZE - 1) | |
45 | static u64 nfsd_devid_seq = 1; | |
46 | static struct list_head nfsd_devid_hash[DEVID_HASH_SIZE]; | |
47 | static DEFINE_SPINLOCK(nfsd_devid_lock); | |
48 | ||
49 | static inline u32 devid_hashfn(u64 idx) | |
50 | { | |
51 | return jhash_2words(idx, idx >> 32, 0) & DEVID_HASH_MASK; | |
52 | } | |
53 | ||
54 | static void | |
55 | nfsd4_alloc_devid_map(const struct svc_fh *fhp) | |
56 | { | |
57 | const struct knfsd_fh *fh = &fhp->fh_handle; | |
58 | size_t fsid_len = key_len(fh->fh_fsid_type); | |
59 | struct nfsd4_deviceid_map *map, *old; | |
60 | int i; | |
61 | ||
62 | map = kzalloc(sizeof(*map) + fsid_len, GFP_KERNEL); | |
63 | if (!map) | |
64 | return; | |
65 | ||
66 | map->fsid_type = fh->fh_fsid_type; | |
67 | memcpy(&map->fsid, fh->fh_fsid, fsid_len); | |
68 | ||
69 | spin_lock(&nfsd_devid_lock); | |
70 | if (fhp->fh_export->ex_devid_map) | |
71 | goto out_unlock; | |
72 | ||
73 | for (i = 0; i < DEVID_HASH_SIZE; i++) { | |
74 | list_for_each_entry(old, &nfsd_devid_hash[i], hash) { | |
75 | if (old->fsid_type != fh->fh_fsid_type) | |
76 | continue; | |
77 | if (memcmp(old->fsid, fh->fh_fsid, | |
78 | key_len(old->fsid_type))) | |
79 | continue; | |
80 | ||
81 | fhp->fh_export->ex_devid_map = old; | |
82 | goto out_unlock; | |
83 | } | |
84 | } | |
85 | ||
86 | map->idx = nfsd_devid_seq++; | |
87 | list_add_tail_rcu(&map->hash, &nfsd_devid_hash[devid_hashfn(map->idx)]); | |
88 | fhp->fh_export->ex_devid_map = map; | |
89 | map = NULL; | |
90 | ||
91 | out_unlock: | |
92 | spin_unlock(&nfsd_devid_lock); | |
93 | kfree(map); | |
94 | } | |
95 | ||
96 | struct nfsd4_deviceid_map * | |
97 | nfsd4_find_devid_map(int idx) | |
98 | { | |
99 | struct nfsd4_deviceid_map *map, *ret = NULL; | |
100 | ||
101 | rcu_read_lock(); | |
102 | list_for_each_entry_rcu(map, &nfsd_devid_hash[devid_hashfn(idx)], hash) | |
103 | if (map->idx == idx) | |
104 | ret = map; | |
105 | rcu_read_unlock(); | |
106 | ||
107 | return ret; | |
108 | } | |
109 | ||
110 | int | |
111 | nfsd4_set_deviceid(struct nfsd4_deviceid *id, const struct svc_fh *fhp, | |
112 | u32 device_generation) | |
113 | { | |
114 | if (!fhp->fh_export->ex_devid_map) { | |
115 | nfsd4_alloc_devid_map(fhp); | |
116 | if (!fhp->fh_export->ex_devid_map) | |
117 | return -ENOMEM; | |
118 | } | |
119 | ||
120 | id->fsid_idx = fhp->fh_export->ex_devid_map->idx; | |
121 | id->generation = device_generation; | |
122 | id->pad = 0; | |
123 | return 0; | |
124 | } | |
125 | ||
126 | void nfsd4_setup_layout_type(struct svc_export *exp) | |
127 | { | |
9b9960a0 | 128 | #if defined(CONFIG_NFSD_BLOCKLAYOUT) || defined(CONFIG_NFSD_SCSILAYOUT) |
8650b8a0 | 129 | struct super_block *sb = exp->ex_path.mnt->mnt_sb; |
9b9960a0 | 130 | #endif |
8650b8a0 | 131 | |
f3f03330 | 132 | if (!(exp->ex_flags & NFSEXP_PNFS)) |
9cf514cc | 133 | return; |
8650b8a0 | 134 | |
f99d4fbd | 135 | /* |
9b9960a0 TH |
136 | * If flex file is configured, use it by default. Otherwise |
137 | * check if the file system supports exporting a block-like layout. | |
f99d4fbd CH |
138 | * If the block device supports reservations prefer the SCSI layout, |
139 | * otherwise advertise the block layout. | |
140 | */ | |
9b9960a0 | 141 | #ifdef CONFIG_NFSD_FLEXFILELAYOUT |
8a4c3926 | 142 | exp->ex_layout_types |= 1 << LAYOUT_FLEX_FILES; |
9b9960a0 | 143 | #endif |
81c39329 | 144 | #ifdef CONFIG_NFSD_BLOCKLAYOUT |
9b9960a0 | 145 | /* overwrite flex file layout selection if needed */ |
8650b8a0 CH |
146 | if (sb->s_export_op->get_uuid && |
147 | sb->s_export_op->map_blocks && | |
148 | sb->s_export_op->commit_blocks) | |
8a4c3926 | 149 | exp->ex_layout_types |= 1 << LAYOUT_BLOCK_VOLUME; |
81c39329 | 150 | #endif |
f99d4fbd CH |
151 | #ifdef CONFIG_NFSD_SCSILAYOUT |
152 | /* overwrite block layout selection if needed */ | |
153 | if (sb->s_export_op->map_blocks && | |
154 | sb->s_export_op->commit_blocks && | |
155 | sb->s_bdev && sb->s_bdev->bd_disk->fops->pr_ops) | |
8a4c3926 | 156 | exp->ex_layout_types |= 1 << LAYOUT_SCSI; |
f99d4fbd | 157 | #endif |
9cf514cc CH |
158 | } |
159 | ||
160 | static void | |
161 | nfsd4_free_layout_stateid(struct nfs4_stid *stid) | |
162 | { | |
163 | struct nfs4_layout_stateid *ls = layoutstateid(stid); | |
164 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
165 | struct nfs4_file *fp = ls->ls_stid.sc_file; | |
166 | ||
31ef83dc CH |
167 | trace_layoutstate_free(&ls->ls_stid.sc_stateid); |
168 | ||
9cf514cc CH |
169 | spin_lock(&clp->cl_lock); |
170 | list_del_init(&ls->ls_perclnt); | |
171 | spin_unlock(&clp->cl_lock); | |
172 | ||
173 | spin_lock(&fp->fi_lock); | |
174 | list_del_init(&ls->ls_perfile); | |
175 | spin_unlock(&fp->fi_lock); | |
176 | ||
c5c707f9 CH |
177 | vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls); |
178 | fput(ls->ls_file); | |
179 | ||
180 | if (ls->ls_recalled) | |
181 | atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); | |
182 | ||
9cf514cc CH |
183 | kmem_cache_free(nfs4_layout_stateid_cache, ls); |
184 | } | |
185 | ||
c5c707f9 CH |
186 | static int |
187 | nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) | |
188 | { | |
189 | struct file_lock *fl; | |
190 | int status; | |
191 | ||
192 | fl = locks_alloc_lock(); | |
193 | if (!fl) | |
194 | return -ENOMEM; | |
195 | locks_init_lock(fl); | |
196 | fl->fl_lmops = &nfsd4_layouts_lm_ops; | |
197 | fl->fl_flags = FL_LAYOUT; | |
198 | fl->fl_type = F_RDLCK; | |
199 | fl->fl_end = OFFSET_MAX; | |
200 | fl->fl_owner = ls; | |
201 | fl->fl_pid = current->tgid; | |
202 | fl->fl_file = ls->ls_file; | |
203 | ||
204 | status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); | |
205 | if (status) { | |
206 | locks_free_lock(fl); | |
207 | return status; | |
208 | } | |
209 | BUG_ON(fl != NULL); | |
210 | return 0; | |
211 | } | |
212 | ||
9cf514cc CH |
213 | static struct nfs4_layout_stateid * |
214 | nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, | |
215 | struct nfs4_stid *parent, u32 layout_type) | |
216 | { | |
217 | struct nfs4_client *clp = cstate->clp; | |
218 | struct nfs4_file *fp = parent->sc_file; | |
219 | struct nfs4_layout_stateid *ls; | |
220 | struct nfs4_stid *stp; | |
221 | ||
222 | stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache); | |
223 | if (!stp) | |
224 | return NULL; | |
225 | stp->sc_free = nfsd4_free_layout_stateid; | |
226 | get_nfs4_file(fp); | |
227 | stp->sc_file = fp; | |
228 | ||
229 | ls = layoutstateid(stp); | |
230 | INIT_LIST_HEAD(&ls->ls_perclnt); | |
231 | INIT_LIST_HEAD(&ls->ls_perfile); | |
232 | spin_lock_init(&ls->ls_lock); | |
233 | INIT_LIST_HEAD(&ls->ls_layouts); | |
cc8a5532 | 234 | mutex_init(&ls->ls_mutex); |
9cf514cc | 235 | ls->ls_layout_type = layout_type; |
c5c707f9 CH |
236 | nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, |
237 | NFSPROC4_CLNT_CB_LAYOUT); | |
238 | ||
239 | if (parent->sc_type == NFS4_DELEG_STID) | |
240 | ls->ls_file = get_file(fp->fi_deleg_file); | |
241 | else | |
242 | ls->ls_file = find_any_file(fp); | |
243 | BUG_ON(!ls->ls_file); | |
244 | ||
245 | if (nfsd4_layout_setlease(ls)) { | |
1ca4b88e | 246 | fput(ls->ls_file); |
c5c707f9 CH |
247 | put_nfs4_file(fp); |
248 | kmem_cache_free(nfs4_layout_stateid_cache, ls); | |
249 | return NULL; | |
250 | } | |
9cf514cc CH |
251 | |
252 | spin_lock(&clp->cl_lock); | |
253 | stp->sc_type = NFS4_LAYOUT_STID; | |
254 | list_add(&ls->ls_perclnt, &clp->cl_lo_states); | |
255 | spin_unlock(&clp->cl_lock); | |
256 | ||
257 | spin_lock(&fp->fi_lock); | |
258 | list_add(&ls->ls_perfile, &fp->fi_lo_states); | |
259 | spin_unlock(&fp->fi_lock); | |
260 | ||
31ef83dc | 261 | trace_layoutstate_alloc(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
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, &stid, | |
279 | net_generic(SVC_NET(rqstp), nfsd_net_id)); | |
280 | if (status) | |
281 | goto out; | |
282 | ||
283 | if (!fh_match(&cstate->current_fh.fh_handle, | |
284 | &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, stid, layout_type); | |
291 | nfs4_put_stid(stid); | |
292 | ||
293 | status = nfserr_jukebox; | |
294 | if (!ls) | |
295 | goto out; | |
cc8a5532 | 296 | mutex_lock(&ls->ls_mutex); |
9cf514cc CH |
297 | } else { |
298 | ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); | |
299 | ||
300 | status = nfserr_bad_stateid; | |
cc8a5532 | 301 | mutex_lock(&ls->ls_mutex); |
14b7f4a1 | 302 | if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid)) |
cc8a5532 | 303 | goto out_unlock_stid; |
9cf514cc | 304 | if (layout_type != ls->ls_layout_type) |
cc8a5532 | 305 | goto out_unlock_stid; |
9cf514cc CH |
306 | } |
307 | ||
308 | *lsp = ls; | |
309 | return 0; | |
310 | ||
cc8a5532 JL |
311 | out_unlock_stid: |
312 | mutex_unlock(&ls->ls_mutex); | |
9cf514cc CH |
313 | out_put_stid: |
314 | nfs4_put_stid(stid); | |
315 | out: | |
316 | return status; | |
317 | } | |
318 | ||
c5c707f9 CH |
319 | static void |
320 | nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) | |
321 | { | |
322 | spin_lock(&ls->ls_lock); | |
323 | if (ls->ls_recalled) | |
324 | goto out_unlock; | |
325 | ||
326 | ls->ls_recalled = true; | |
327 | atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); | |
328 | if (list_empty(&ls->ls_layouts)) | |
329 | goto out_unlock; | |
330 | ||
31ef83dc CH |
331 | trace_layout_recall(&ls->ls_stid.sc_stateid); |
332 | ||
c5c707f9 | 333 | atomic_inc(&ls->ls_stid.sc_count); |
c5c707f9 CH |
334 | nfsd4_run_cb(&ls->ls_recall); |
335 | ||
336 | out_unlock: | |
337 | spin_unlock(&ls->ls_lock); | |
338 | } | |
339 | ||
9cf514cc CH |
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(&lo->lo_seg) <= s->offset) | |
362 | return false; | |
363 | if (layout_end(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(new) < lo->offset) | |
374 | return false; | |
375 | if (layout_end(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 | ||
c5c707f9 CH |
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(l); | |
395 | nfserr = nfserr_recallconflict; | |
396 | } | |
397 | } | |
398 | ||
399 | return nfserr; | |
400 | } | |
401 | ||
9cf514cc CH |
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; | |
c5c707f9 | 406 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
9cf514cc | 407 | struct nfs4_layout *lp, *new = NULL; |
c5c707f9 | 408 | __be32 nfserr; |
9cf514cc | 409 | |
c5c707f9 CH |
410 | spin_lock(&fp->fi_lock); |
411 | nfserr = nfsd4_recall_conflict(ls); | |
412 | if (nfserr) | |
413 | goto out; | |
9cf514cc CH |
414 | spin_lock(&ls->ls_lock); |
415 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
416 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
417 | goto done; | |
418 | } | |
419 | spin_unlock(&ls->ls_lock); | |
c5c707f9 | 420 | spin_unlock(&fp->fi_lock); |
9cf514cc CH |
421 | |
422 | new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); | |
423 | if (!new) | |
424 | return nfserr_jukebox; | |
425 | memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg)); | |
426 | new->lo_state = ls; | |
427 | ||
c5c707f9 CH |
428 | spin_lock(&fp->fi_lock); |
429 | nfserr = nfsd4_recall_conflict(ls); | |
430 | if (nfserr) | |
431 | goto out; | |
9cf514cc CH |
432 | spin_lock(&ls->ls_lock); |
433 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
434 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
435 | goto done; | |
436 | } | |
437 | ||
438 | atomic_inc(&ls->ls_stid.sc_count); | |
439 | list_add_tail(&new->lo_perstate, &ls->ls_layouts); | |
440 | new = NULL; | |
441 | done: | |
9767feb2 | 442 | nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); |
9cf514cc | 443 | spin_unlock(&ls->ls_lock); |
c5c707f9 CH |
444 | out: |
445 | spin_unlock(&fp->fi_lock); | |
9cf514cc CH |
446 | if (new) |
447 | kmem_cache_free(nfs4_layout_cache, new); | |
c5c707f9 | 448 | return nfserr; |
9cf514cc CH |
449 | } |
450 | ||
451 | static void | |
452 | nfsd4_free_layouts(struct list_head *reaplist) | |
453 | { | |
454 | while (!list_empty(reaplist)) { | |
455 | struct nfs4_layout *lp = list_first_entry(reaplist, | |
456 | struct nfs4_layout, lo_perstate); | |
457 | ||
458 | list_del(&lp->lo_perstate); | |
459 | nfs4_put_stid(&lp->lo_state->ls_stid); | |
460 | kmem_cache_free(nfs4_layout_cache, 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(lo); | |
470 | ||
471 | if (seg->offset <= lo->offset) { | |
472 | if (layout_end(seg) >= end) { | |
473 | list_move_tail(&lp->lo_perstate, reaplist); | |
474 | return; | |
475 | } | |
7890203d | 476 | lo->offset = layout_end(seg); |
9cf514cc CH |
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 | } | |
7890203d | 483 | end = seg->offset; |
9cf514cc CH |
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, &lrp->lr_sid, | |
501 | false, lrp->lr_layout_type, | |
502 | &ls); | |
31ef83dc CH |
503 | if (nfserr) { |
504 | trace_layout_return_lookup_fail(&lrp->lr_sid); | |
9cf514cc | 505 | return nfserr; |
31ef83dc | 506 | } |
9cf514cc CH |
507 | |
508 | spin_lock(&ls->ls_lock); | |
509 | list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { | |
510 | if (layouts_overlapping(lp, &lrp->lr_seg)) { | |
511 | nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); | |
512 | found++; | |
513 | } | |
514 | } | |
515 | if (!list_empty(&ls->ls_layouts)) { | |
9767feb2 JL |
516 | if (found) |
517 | nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); | |
9cf514cc CH |
518 | lrp->lrs_present = 1; |
519 | } else { | |
31ef83dc | 520 | trace_layoutstate_unhash(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
521 | nfs4_unhash_stid(&ls->ls_stid); |
522 | lrp->lrs_present = 0; | |
523 | } | |
524 | spin_unlock(&ls->ls_lock); | |
525 | ||
cc8a5532 | 526 | mutex_unlock(&ls->ls_mutex); |
9cf514cc CH |
527 | nfs4_put_stid(&ls->ls_stid); |
528 | nfsd4_free_layouts(&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 = 0; | |
543 | ||
544 | spin_lock(&clp->cl_lock); | |
545 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { | |
6f8f28ec KM |
546 | if (ls->ls_layout_type != lrp->lr_layout_type) |
547 | continue; | |
548 | ||
9cf514cc CH |
549 | if (lrp->lr_return_type == RETURN_FSID && |
550 | !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, | |
551 | &cstate->current_fh.fh_handle)) | |
552 | continue; | |
553 | ||
554 | spin_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(&lp->lo_perstate, &reaplist); | |
559 | } | |
560 | spin_unlock(&ls->ls_lock); | |
561 | } | |
562 | spin_unlock(&clp->cl_lock); | |
563 | ||
564 | nfsd4_free_layouts(&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(&ls->ls_lock); | |
573 | list_splice_init(&ls->ls_layouts, reaplist); | |
574 | spin_unlock(&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(&clp->cl_lock); | |
584 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) | |
585 | nfsd4_return_all_layouts(ls, &reaplist); | |
586 | spin_unlock(&clp->cl_lock); | |
587 | ||
588 | nfsd4_free_layouts(&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(&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); | |
601 | } | |
602 | spin_unlock(&fp->fi_lock); | |
603 | ||
604 | nfsd4_free_layouts(&reaplist); | |
605 | } | |
606 | ||
c5c707f9 CH |
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 *envp[] = { | |
613 | "HOME=/", | |
614 | "TERM=linux", | |
615 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
616 | NULL | |
617 | }; | |
618 | char *argv[8]; | |
619 | int error; | |
620 | ||
621 | rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); | |
622 | ||
623 | printk(KERN_WARNING | |
624 | "nfsd: client %s failed to respond to layout recall. " | |
625 | " Fencing..\n", addr_str); | |
626 | ||
627 | argv[0] = "/sbin/nfsd-recall-failed"; | |
628 | argv[1] = addr_str; | |
629 | argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id; | |
630 | argv[3] = NULL; | |
631 | ||
632 | error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
633 | if (error) { | |
634 | printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", | |
635 | addr_str, error); | |
636 | } | |
637 | } | |
638 | ||
cc8a5532 JL |
639 | static void |
640 | nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) | |
641 | { | |
642 | struct nfs4_layout_stateid *ls = | |
643 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
644 | ||
645 | mutex_lock(&ls->ls_mutex); | |
9767feb2 | 646 | nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); |
be20aa00 | 647 | mutex_unlock(&ls->ls_mutex); |
cc8a5532 JL |
648 | } |
649 | ||
c5c707f9 CH |
650 | static int |
651 | nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) | |
652 | { | |
653 | struct nfs4_layout_stateid *ls = | |
654 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
6b9b2107 JL |
655 | struct nfsd_net *nn; |
656 | ktime_t now, cutoff; | |
f99d4fbd | 657 | const struct nfsd4_layout_ops *ops; |
c5c707f9 CH |
658 | LIST_HEAD(reaplist); |
659 | ||
6b9b2107 | 660 | |
c5c707f9 CH |
661 | switch (task->tk_status) { |
662 | case 0: | |
6b9b2107 JL |
663 | case -NFS4ERR_DELAY: |
664 | /* | |
665 | * Anything left? If not, then call it done. Note that we don't | |
666 | * take the spinlock since this is an optimization and nothing | |
667 | * should get added until the cb counter goes to zero. | |
668 | */ | |
669 | if (list_empty(&ls->ls_layouts)) | |
670 | return 1; | |
671 | ||
672 | /* Poll the client until it's done with the layout */ | |
673 | now = ktime_get(); | |
674 | nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id); | |
675 | ||
676 | /* Client gets 2 lease periods to return it */ | |
677 | cutoff = ktime_add_ns(task->tk_start, | |
678 | nn->nfsd4_lease * NSEC_PER_SEC * 2); | |
679 | ||
680 | if (ktime_before(now, cutoff)) { | |
681 | rpc_delay(task, HZ/100); /* 10 mili-seconds */ | |
682 | return 0; | |
683 | } | |
684 | /* Fallthrough */ | |
c5c707f9 | 685 | case -NFS4ERR_NOMATCHING_LAYOUT: |
31ef83dc | 686 | trace_layout_recall_done(&ls->ls_stid.sc_stateid); |
c5c707f9 CH |
687 | task->tk_status = 0; |
688 | return 1; | |
c5c707f9 CH |
689 | default: |
690 | /* | |
691 | * Unknown error or non-responding client, we'll need to fence. | |
692 | */ | |
f99d4fbd CH |
693 | trace_layout_recall_fail(&ls->ls_stid.sc_stateid); |
694 | ||
695 | ops = nfsd4_layout_ops[ls->ls_layout_type]; | |
696 | if (ops->fence_client) | |
697 | ops->fence_client(ls); | |
698 | else | |
699 | nfsd4_cb_layout_fail(ls); | |
c5c707f9 CH |
700 | return -1; |
701 | } | |
702 | } | |
703 | ||
704 | static void | |
705 | nfsd4_cb_layout_release(struct nfsd4_callback *cb) | |
706 | { | |
707 | struct nfs4_layout_stateid *ls = | |
708 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
709 | LIST_HEAD(reaplist); | |
710 | ||
31ef83dc CH |
711 | trace_layout_recall_release(&ls->ls_stid.sc_stateid); |
712 | ||
c5c707f9 CH |
713 | nfsd4_return_all_layouts(ls, &reaplist); |
714 | nfsd4_free_layouts(&reaplist); | |
715 | nfs4_put_stid(&ls->ls_stid); | |
716 | } | |
717 | ||
c4cb8974 | 718 | static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { |
cc8a5532 | 719 | .prepare = nfsd4_cb_layout_prepare, |
c5c707f9 CH |
720 | .done = nfsd4_cb_layout_done, |
721 | .release = nfsd4_cb_layout_release, | |
722 | }; | |
723 | ||
724 | static bool | |
725 | nfsd4_layout_lm_break(struct file_lock *fl) | |
726 | { | |
727 | /* | |
728 | * We don't want the locks code to timeout the lease for us; | |
729 | * we'll remove it ourself if a layout isn't returned | |
730 | * in time: | |
731 | */ | |
732 | fl->fl_break_time = 0; | |
733 | nfsd4_recall_file_layout(fl->fl_owner); | |
734 | return false; | |
735 | } | |
736 | ||
737 | static int | |
738 | nfsd4_layout_lm_change(struct file_lock *onlist, int arg, | |
739 | struct list_head *dispose) | |
740 | { | |
741 | BUG_ON(!(arg & F_UNLCK)); | |
742 | return lease_modify(onlist, arg, dispose); | |
743 | } | |
744 | ||
745 | static const struct lock_manager_operations nfsd4_layouts_lm_ops = { | |
746 | .lm_break = nfsd4_layout_lm_break, | |
747 | .lm_change = nfsd4_layout_lm_change, | |
748 | }; | |
749 | ||
9cf514cc CH |
750 | int |
751 | nfsd4_init_pnfs(void) | |
752 | { | |
753 | int i; | |
754 | ||
755 | for (i = 0; i < DEVID_HASH_SIZE; i++) | |
756 | INIT_LIST_HEAD(&nfsd_devid_hash[i]); | |
757 | ||
758 | nfs4_layout_cache = kmem_cache_create("nfs4_layout", | |
759 | sizeof(struct nfs4_layout), 0, 0, NULL); | |
760 | if (!nfs4_layout_cache) | |
761 | return -ENOMEM; | |
762 | ||
763 | nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid", | |
764 | sizeof(struct nfs4_layout_stateid), 0, 0, NULL); | |
765 | if (!nfs4_layout_stateid_cache) { | |
766 | kmem_cache_destroy(nfs4_layout_cache); | |
767 | return -ENOMEM; | |
768 | } | |
769 | return 0; | |
770 | } | |
771 | ||
772 | void | |
773 | nfsd4_exit_pnfs(void) | |
774 | { | |
775 | int i; | |
776 | ||
777 | kmem_cache_destroy(nfs4_layout_cache); | |
778 | kmem_cache_destroy(nfs4_layout_stateid_cache); | |
779 | ||
780 | for (i = 0; i < DEVID_HASH_SIZE; i++) { | |
781 | struct nfsd4_deviceid_map *map, *n; | |
782 | ||
783 | list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) | |
784 | kfree(map); | |
785 | } | |
786 | } |