Commit | Line | Data |
---|---|---|
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 | ||
d834007b JL |
177 | if (!nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
178 | vfs_setlease(ls->ls_file, F_UNLCK, NULL, (void **)&ls); | |
c5c707f9 CH |
179 | fput(ls->ls_file); |
180 | ||
181 | if (ls->ls_recalled) | |
182 | atomic_dec(&ls->ls_stid.sc_file->fi_lo_recalls); | |
183 | ||
9cf514cc CH |
184 | kmem_cache_free(nfs4_layout_stateid_cache, ls); |
185 | } | |
186 | ||
c5c707f9 CH |
187 | static int |
188 | nfsd4_layout_setlease(struct nfs4_layout_stateid *ls) | |
189 | { | |
190 | struct file_lock *fl; | |
191 | int status; | |
192 | ||
d834007b JL |
193 | if (nfsd4_layout_ops[ls->ls_layout_type]->disable_recalls) |
194 | return 0; | |
195 | ||
c5c707f9 CH |
196 | fl = locks_alloc_lock(); |
197 | if (!fl) | |
198 | return -ENOMEM; | |
199 | locks_init_lock(fl); | |
200 | fl->fl_lmops = &nfsd4_layouts_lm_ops; | |
201 | fl->fl_flags = FL_LAYOUT; | |
202 | fl->fl_type = F_RDLCK; | |
203 | fl->fl_end = OFFSET_MAX; | |
204 | fl->fl_owner = ls; | |
205 | fl->fl_pid = current->tgid; | |
206 | fl->fl_file = ls->ls_file; | |
207 | ||
208 | status = vfs_setlease(fl->fl_file, fl->fl_type, &fl, NULL); | |
209 | if (status) { | |
210 | locks_free_lock(fl); | |
211 | return status; | |
212 | } | |
213 | BUG_ON(fl != NULL); | |
214 | return 0; | |
215 | } | |
216 | ||
9cf514cc CH |
217 | static struct nfs4_layout_stateid * |
218 | nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, | |
219 | struct nfs4_stid *parent, u32 layout_type) | |
220 | { | |
221 | struct nfs4_client *clp = cstate->clp; | |
222 | struct nfs4_file *fp = parent->sc_file; | |
223 | struct nfs4_layout_stateid *ls; | |
224 | struct nfs4_stid *stp; | |
225 | ||
226 | stp = nfs4_alloc_stid(cstate->clp, nfs4_layout_stateid_cache); | |
227 | if (!stp) | |
228 | return NULL; | |
229 | stp->sc_free = nfsd4_free_layout_stateid; | |
230 | get_nfs4_file(fp); | |
231 | stp->sc_file = fp; | |
232 | ||
233 | ls = layoutstateid(stp); | |
234 | INIT_LIST_HEAD(&ls->ls_perclnt); | |
235 | INIT_LIST_HEAD(&ls->ls_perfile); | |
236 | spin_lock_init(&ls->ls_lock); | |
237 | INIT_LIST_HEAD(&ls->ls_layouts); | |
cc8a5532 | 238 | mutex_init(&ls->ls_mutex); |
9cf514cc | 239 | ls->ls_layout_type = layout_type; |
c5c707f9 CH |
240 | nfsd4_init_cb(&ls->ls_recall, clp, &nfsd4_cb_layout_ops, |
241 | NFSPROC4_CLNT_CB_LAYOUT); | |
242 | ||
243 | if (parent->sc_type == NFS4_DELEG_STID) | |
244 | ls->ls_file = get_file(fp->fi_deleg_file); | |
245 | else | |
246 | ls->ls_file = find_any_file(fp); | |
247 | BUG_ON(!ls->ls_file); | |
248 | ||
249 | if (nfsd4_layout_setlease(ls)) { | |
1ca4b88e | 250 | fput(ls->ls_file); |
c5c707f9 CH |
251 | put_nfs4_file(fp); |
252 | kmem_cache_free(nfs4_layout_stateid_cache, ls); | |
253 | return NULL; | |
254 | } | |
9cf514cc CH |
255 | |
256 | spin_lock(&clp->cl_lock); | |
257 | stp->sc_type = NFS4_LAYOUT_STID; | |
258 | list_add(&ls->ls_perclnt, &clp->cl_lo_states); | |
259 | spin_unlock(&clp->cl_lock); | |
260 | ||
261 | spin_lock(&fp->fi_lock); | |
262 | list_add(&ls->ls_perfile, &fp->fi_lo_states); | |
263 | spin_unlock(&fp->fi_lock); | |
264 | ||
31ef83dc | 265 | trace_layoutstate_alloc(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
266 | return ls; |
267 | } | |
268 | ||
269 | __be32 | |
270 | nfsd4_preprocess_layout_stateid(struct svc_rqst *rqstp, | |
271 | struct nfsd4_compound_state *cstate, stateid_t *stateid, | |
272 | bool create, u32 layout_type, struct nfs4_layout_stateid **lsp) | |
273 | { | |
274 | struct nfs4_layout_stateid *ls; | |
275 | struct nfs4_stid *stid; | |
276 | unsigned char typemask = NFS4_LAYOUT_STID; | |
277 | __be32 status; | |
278 | ||
279 | if (create) | |
280 | typemask |= (NFS4_OPEN_STID | NFS4_LOCK_STID | NFS4_DELEG_STID); | |
281 | ||
282 | status = nfsd4_lookup_stateid(cstate, stateid, typemask, &stid, | |
283 | net_generic(SVC_NET(rqstp), nfsd_net_id)); | |
284 | if (status) | |
285 | goto out; | |
286 | ||
287 | if (!fh_match(&cstate->current_fh.fh_handle, | |
288 | &stid->sc_file->fi_fhandle)) { | |
289 | status = nfserr_bad_stateid; | |
290 | goto out_put_stid; | |
291 | } | |
292 | ||
293 | if (stid->sc_type != NFS4_LAYOUT_STID) { | |
294 | ls = nfsd4_alloc_layout_stateid(cstate, stid, layout_type); | |
295 | nfs4_put_stid(stid); | |
296 | ||
297 | status = nfserr_jukebox; | |
298 | if (!ls) | |
299 | goto out; | |
cc8a5532 | 300 | mutex_lock(&ls->ls_mutex); |
9cf514cc CH |
301 | } else { |
302 | ls = container_of(stid, struct nfs4_layout_stateid, ls_stid); | |
303 | ||
304 | status = nfserr_bad_stateid; | |
cc8a5532 | 305 | mutex_lock(&ls->ls_mutex); |
14b7f4a1 | 306 | if (nfsd4_stateid_generation_after(stateid, &stid->sc_stateid)) |
cc8a5532 | 307 | goto out_unlock_stid; |
9cf514cc | 308 | if (layout_type != ls->ls_layout_type) |
cc8a5532 | 309 | goto out_unlock_stid; |
9cf514cc CH |
310 | } |
311 | ||
312 | *lsp = ls; | |
313 | return 0; | |
314 | ||
cc8a5532 JL |
315 | out_unlock_stid: |
316 | mutex_unlock(&ls->ls_mutex); | |
9cf514cc CH |
317 | out_put_stid: |
318 | nfs4_put_stid(stid); | |
319 | out: | |
320 | return status; | |
321 | } | |
322 | ||
c5c707f9 CH |
323 | static void |
324 | nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls) | |
325 | { | |
326 | spin_lock(&ls->ls_lock); | |
327 | if (ls->ls_recalled) | |
328 | goto out_unlock; | |
329 | ||
330 | ls->ls_recalled = true; | |
331 | atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls); | |
332 | if (list_empty(&ls->ls_layouts)) | |
333 | goto out_unlock; | |
334 | ||
31ef83dc CH |
335 | trace_layout_recall(&ls->ls_stid.sc_stateid); |
336 | ||
c5c707f9 | 337 | atomic_inc(&ls->ls_stid.sc_count); |
c5c707f9 CH |
338 | nfsd4_run_cb(&ls->ls_recall); |
339 | ||
340 | out_unlock: | |
341 | spin_unlock(&ls->ls_lock); | |
342 | } | |
343 | ||
9cf514cc CH |
344 | static inline u64 |
345 | layout_end(struct nfsd4_layout_seg *seg) | |
346 | { | |
347 | u64 end = seg->offset + seg->length; | |
348 | return end >= seg->offset ? end : NFS4_MAX_UINT64; | |
349 | } | |
350 | ||
351 | static void | |
352 | layout_update_len(struct nfsd4_layout_seg *lo, u64 end) | |
353 | { | |
354 | if (end == NFS4_MAX_UINT64) | |
355 | lo->length = NFS4_MAX_UINT64; | |
356 | else | |
357 | lo->length = end - lo->offset; | |
358 | } | |
359 | ||
360 | static bool | |
361 | layouts_overlapping(struct nfs4_layout *lo, struct nfsd4_layout_seg *s) | |
362 | { | |
363 | if (s->iomode != IOMODE_ANY && s->iomode != lo->lo_seg.iomode) | |
364 | return false; | |
365 | if (layout_end(&lo->lo_seg) <= s->offset) | |
366 | return false; | |
367 | if (layout_end(s) <= lo->lo_seg.offset) | |
368 | return false; | |
369 | return true; | |
370 | } | |
371 | ||
372 | static bool | |
373 | layouts_try_merge(struct nfsd4_layout_seg *lo, struct nfsd4_layout_seg *new) | |
374 | { | |
375 | if (lo->iomode != new->iomode) | |
376 | return false; | |
377 | if (layout_end(new) < lo->offset) | |
378 | return false; | |
379 | if (layout_end(lo) < new->offset) | |
380 | return false; | |
381 | ||
382 | lo->offset = min(lo->offset, new->offset); | |
383 | layout_update_len(lo, max(layout_end(lo), layout_end(new))); | |
384 | return true; | |
385 | } | |
386 | ||
c5c707f9 CH |
387 | static __be32 |
388 | nfsd4_recall_conflict(struct nfs4_layout_stateid *ls) | |
389 | { | |
390 | struct nfs4_file *fp = ls->ls_stid.sc_file; | |
391 | struct nfs4_layout_stateid *l, *n; | |
392 | __be32 nfserr = nfs_ok; | |
393 | ||
394 | assert_spin_locked(&fp->fi_lock); | |
395 | ||
396 | list_for_each_entry_safe(l, n, &fp->fi_lo_states, ls_perfile) { | |
397 | if (l != ls) { | |
398 | nfsd4_recall_file_layout(l); | |
399 | nfserr = nfserr_recallconflict; | |
400 | } | |
401 | } | |
402 | ||
403 | return nfserr; | |
404 | } | |
405 | ||
9cf514cc CH |
406 | __be32 |
407 | nfsd4_insert_layout(struct nfsd4_layoutget *lgp, struct nfs4_layout_stateid *ls) | |
408 | { | |
409 | struct nfsd4_layout_seg *seg = &lgp->lg_seg; | |
c5c707f9 | 410 | struct nfs4_file *fp = ls->ls_stid.sc_file; |
9cf514cc | 411 | struct nfs4_layout *lp, *new = NULL; |
c5c707f9 | 412 | __be32 nfserr; |
9cf514cc | 413 | |
c5c707f9 CH |
414 | spin_lock(&fp->fi_lock); |
415 | nfserr = nfsd4_recall_conflict(ls); | |
416 | if (nfserr) | |
417 | goto out; | |
9cf514cc CH |
418 | spin_lock(&ls->ls_lock); |
419 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
420 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
421 | goto done; | |
422 | } | |
423 | spin_unlock(&ls->ls_lock); | |
c5c707f9 | 424 | spin_unlock(&fp->fi_lock); |
9cf514cc CH |
425 | |
426 | new = kmem_cache_alloc(nfs4_layout_cache, GFP_KERNEL); | |
427 | if (!new) | |
428 | return nfserr_jukebox; | |
429 | memcpy(&new->lo_seg, seg, sizeof(lp->lo_seg)); | |
430 | new->lo_state = ls; | |
431 | ||
c5c707f9 CH |
432 | spin_lock(&fp->fi_lock); |
433 | nfserr = nfsd4_recall_conflict(ls); | |
434 | if (nfserr) | |
435 | goto out; | |
9cf514cc CH |
436 | spin_lock(&ls->ls_lock); |
437 | list_for_each_entry(lp, &ls->ls_layouts, lo_perstate) { | |
438 | if (layouts_try_merge(&lp->lo_seg, seg)) | |
439 | goto done; | |
440 | } | |
441 | ||
442 | atomic_inc(&ls->ls_stid.sc_count); | |
443 | list_add_tail(&new->lo_perstate, &ls->ls_layouts); | |
444 | new = NULL; | |
445 | done: | |
9767feb2 | 446 | nfs4_inc_and_copy_stateid(&lgp->lg_sid, &ls->ls_stid); |
9cf514cc | 447 | spin_unlock(&ls->ls_lock); |
c5c707f9 CH |
448 | out: |
449 | spin_unlock(&fp->fi_lock); | |
9cf514cc CH |
450 | if (new) |
451 | kmem_cache_free(nfs4_layout_cache, new); | |
c5c707f9 | 452 | return nfserr; |
9cf514cc CH |
453 | } |
454 | ||
455 | static void | |
456 | nfsd4_free_layouts(struct list_head *reaplist) | |
457 | { | |
458 | while (!list_empty(reaplist)) { | |
459 | struct nfs4_layout *lp = list_first_entry(reaplist, | |
460 | struct nfs4_layout, lo_perstate); | |
461 | ||
462 | list_del(&lp->lo_perstate); | |
463 | nfs4_put_stid(&lp->lo_state->ls_stid); | |
464 | kmem_cache_free(nfs4_layout_cache, lp); | |
465 | } | |
466 | } | |
467 | ||
468 | static void | |
469 | nfsd4_return_file_layout(struct nfs4_layout *lp, struct nfsd4_layout_seg *seg, | |
470 | struct list_head *reaplist) | |
471 | { | |
472 | struct nfsd4_layout_seg *lo = &lp->lo_seg; | |
473 | u64 end = layout_end(lo); | |
474 | ||
475 | if (seg->offset <= lo->offset) { | |
476 | if (layout_end(seg) >= end) { | |
477 | list_move_tail(&lp->lo_perstate, reaplist); | |
478 | return; | |
479 | } | |
7890203d | 480 | lo->offset = layout_end(seg); |
9cf514cc CH |
481 | } else { |
482 | /* retain the whole layout segment on a split. */ | |
483 | if (layout_end(seg) < end) { | |
484 | dprintk("%s: split not supported\n", __func__); | |
485 | return; | |
486 | } | |
7890203d | 487 | end = seg->offset; |
9cf514cc CH |
488 | } |
489 | ||
490 | layout_update_len(lo, end); | |
491 | } | |
492 | ||
493 | __be32 | |
494 | nfsd4_return_file_layouts(struct svc_rqst *rqstp, | |
495 | struct nfsd4_compound_state *cstate, | |
496 | struct nfsd4_layoutreturn *lrp) | |
497 | { | |
498 | struct nfs4_layout_stateid *ls; | |
499 | struct nfs4_layout *lp, *n; | |
500 | LIST_HEAD(reaplist); | |
501 | __be32 nfserr; | |
502 | int found = 0; | |
503 | ||
504 | nfserr = nfsd4_preprocess_layout_stateid(rqstp, cstate, &lrp->lr_sid, | |
505 | false, lrp->lr_layout_type, | |
506 | &ls); | |
31ef83dc CH |
507 | if (nfserr) { |
508 | trace_layout_return_lookup_fail(&lrp->lr_sid); | |
9cf514cc | 509 | return nfserr; |
31ef83dc | 510 | } |
9cf514cc CH |
511 | |
512 | spin_lock(&ls->ls_lock); | |
513 | list_for_each_entry_safe(lp, n, &ls->ls_layouts, lo_perstate) { | |
514 | if (layouts_overlapping(lp, &lrp->lr_seg)) { | |
515 | nfsd4_return_file_layout(lp, &lrp->lr_seg, &reaplist); | |
516 | found++; | |
517 | } | |
518 | } | |
519 | if (!list_empty(&ls->ls_layouts)) { | |
9767feb2 JL |
520 | if (found) |
521 | nfs4_inc_and_copy_stateid(&lrp->lr_sid, &ls->ls_stid); | |
9cf514cc CH |
522 | lrp->lrs_present = 1; |
523 | } else { | |
31ef83dc | 524 | trace_layoutstate_unhash(&ls->ls_stid.sc_stateid); |
9cf514cc CH |
525 | nfs4_unhash_stid(&ls->ls_stid); |
526 | lrp->lrs_present = 0; | |
527 | } | |
528 | spin_unlock(&ls->ls_lock); | |
529 | ||
cc8a5532 | 530 | mutex_unlock(&ls->ls_mutex); |
9cf514cc CH |
531 | nfs4_put_stid(&ls->ls_stid); |
532 | nfsd4_free_layouts(&reaplist); | |
533 | return nfs_ok; | |
534 | } | |
535 | ||
536 | __be32 | |
537 | nfsd4_return_client_layouts(struct svc_rqst *rqstp, | |
538 | struct nfsd4_compound_state *cstate, | |
539 | struct nfsd4_layoutreturn *lrp) | |
540 | { | |
541 | struct nfs4_layout_stateid *ls, *n; | |
542 | struct nfs4_client *clp = cstate->clp; | |
543 | struct nfs4_layout *lp, *t; | |
544 | LIST_HEAD(reaplist); | |
545 | ||
546 | lrp->lrs_present = 0; | |
547 | ||
548 | spin_lock(&clp->cl_lock); | |
549 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) { | |
6f8f28ec KM |
550 | if (ls->ls_layout_type != lrp->lr_layout_type) |
551 | continue; | |
552 | ||
9cf514cc CH |
553 | if (lrp->lr_return_type == RETURN_FSID && |
554 | !fh_fsid_match(&ls->ls_stid.sc_file->fi_fhandle, | |
555 | &cstate->current_fh.fh_handle)) | |
556 | continue; | |
557 | ||
558 | spin_lock(&ls->ls_lock); | |
559 | list_for_each_entry_safe(lp, t, &ls->ls_layouts, lo_perstate) { | |
560 | if (lrp->lr_seg.iomode == IOMODE_ANY || | |
561 | lrp->lr_seg.iomode == lp->lo_seg.iomode) | |
562 | list_move_tail(&lp->lo_perstate, &reaplist); | |
563 | } | |
564 | spin_unlock(&ls->ls_lock); | |
565 | } | |
566 | spin_unlock(&clp->cl_lock); | |
567 | ||
568 | nfsd4_free_layouts(&reaplist); | |
569 | return 0; | |
570 | } | |
571 | ||
572 | static void | |
573 | nfsd4_return_all_layouts(struct nfs4_layout_stateid *ls, | |
574 | struct list_head *reaplist) | |
575 | { | |
576 | spin_lock(&ls->ls_lock); | |
577 | list_splice_init(&ls->ls_layouts, reaplist); | |
578 | spin_unlock(&ls->ls_lock); | |
579 | } | |
580 | ||
581 | void | |
582 | nfsd4_return_all_client_layouts(struct nfs4_client *clp) | |
583 | { | |
584 | struct nfs4_layout_stateid *ls, *n; | |
585 | LIST_HEAD(reaplist); | |
586 | ||
587 | spin_lock(&clp->cl_lock); | |
588 | list_for_each_entry_safe(ls, n, &clp->cl_lo_states, ls_perclnt) | |
589 | nfsd4_return_all_layouts(ls, &reaplist); | |
590 | spin_unlock(&clp->cl_lock); | |
591 | ||
592 | nfsd4_free_layouts(&reaplist); | |
593 | } | |
594 | ||
595 | void | |
596 | nfsd4_return_all_file_layouts(struct nfs4_client *clp, struct nfs4_file *fp) | |
597 | { | |
598 | struct nfs4_layout_stateid *ls, *n; | |
599 | LIST_HEAD(reaplist); | |
600 | ||
601 | spin_lock(&fp->fi_lock); | |
602 | list_for_each_entry_safe(ls, n, &fp->fi_lo_states, ls_perfile) { | |
603 | if (ls->ls_stid.sc_client == clp) | |
604 | nfsd4_return_all_layouts(ls, &reaplist); | |
605 | } | |
606 | spin_unlock(&fp->fi_lock); | |
607 | ||
608 | nfsd4_free_layouts(&reaplist); | |
609 | } | |
610 | ||
c5c707f9 CH |
611 | static void |
612 | nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls) | |
613 | { | |
614 | struct nfs4_client *clp = ls->ls_stid.sc_client; | |
615 | char addr_str[INET6_ADDRSTRLEN]; | |
616 | static char *envp[] = { | |
617 | "HOME=/", | |
618 | "TERM=linux", | |
619 | "PATH=/sbin:/usr/sbin:/bin:/usr/bin", | |
620 | NULL | |
621 | }; | |
622 | char *argv[8]; | |
623 | int error; | |
624 | ||
625 | rpc_ntop((struct sockaddr *)&clp->cl_addr, addr_str, sizeof(addr_str)); | |
626 | ||
627 | printk(KERN_WARNING | |
628 | "nfsd: client %s failed to respond to layout recall. " | |
629 | " Fencing..\n", addr_str); | |
630 | ||
631 | argv[0] = "/sbin/nfsd-recall-failed"; | |
632 | argv[1] = addr_str; | |
633 | argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id; | |
634 | argv[3] = NULL; | |
635 | ||
636 | error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); | |
637 | if (error) { | |
638 | printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n", | |
639 | addr_str, error); | |
640 | } | |
641 | } | |
642 | ||
cc8a5532 JL |
643 | static void |
644 | nfsd4_cb_layout_prepare(struct nfsd4_callback *cb) | |
645 | { | |
646 | struct nfs4_layout_stateid *ls = | |
647 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
648 | ||
649 | mutex_lock(&ls->ls_mutex); | |
9767feb2 | 650 | nfs4_inc_and_copy_stateid(&ls->ls_recall_sid, &ls->ls_stid); |
be20aa00 | 651 | mutex_unlock(&ls->ls_mutex); |
cc8a5532 JL |
652 | } |
653 | ||
c5c707f9 CH |
654 | static int |
655 | nfsd4_cb_layout_done(struct nfsd4_callback *cb, struct rpc_task *task) | |
656 | { | |
657 | struct nfs4_layout_stateid *ls = | |
658 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
6b9b2107 JL |
659 | struct nfsd_net *nn; |
660 | ktime_t now, cutoff; | |
f99d4fbd | 661 | const struct nfsd4_layout_ops *ops; |
c5c707f9 CH |
662 | LIST_HEAD(reaplist); |
663 | ||
6b9b2107 | 664 | |
c5c707f9 CH |
665 | switch (task->tk_status) { |
666 | case 0: | |
6b9b2107 JL |
667 | case -NFS4ERR_DELAY: |
668 | /* | |
669 | * Anything left? If not, then call it done. Note that we don't | |
670 | * take the spinlock since this is an optimization and nothing | |
671 | * should get added until the cb counter goes to zero. | |
672 | */ | |
673 | if (list_empty(&ls->ls_layouts)) | |
674 | return 1; | |
675 | ||
676 | /* Poll the client until it's done with the layout */ | |
677 | now = ktime_get(); | |
678 | nn = net_generic(ls->ls_stid.sc_client->net, nfsd_net_id); | |
679 | ||
680 | /* Client gets 2 lease periods to return it */ | |
681 | cutoff = ktime_add_ns(task->tk_start, | |
682 | nn->nfsd4_lease * NSEC_PER_SEC * 2); | |
683 | ||
684 | if (ktime_before(now, cutoff)) { | |
685 | rpc_delay(task, HZ/100); /* 10 mili-seconds */ | |
686 | return 0; | |
687 | } | |
688 | /* Fallthrough */ | |
c5c707f9 | 689 | case -NFS4ERR_NOMATCHING_LAYOUT: |
31ef83dc | 690 | trace_layout_recall_done(&ls->ls_stid.sc_stateid); |
c5c707f9 CH |
691 | task->tk_status = 0; |
692 | return 1; | |
c5c707f9 CH |
693 | default: |
694 | /* | |
695 | * Unknown error or non-responding client, we'll need to fence. | |
696 | */ | |
f99d4fbd CH |
697 | trace_layout_recall_fail(&ls->ls_stid.sc_stateid); |
698 | ||
699 | ops = nfsd4_layout_ops[ls->ls_layout_type]; | |
700 | if (ops->fence_client) | |
701 | ops->fence_client(ls); | |
702 | else | |
703 | nfsd4_cb_layout_fail(ls); | |
c5c707f9 CH |
704 | return -1; |
705 | } | |
706 | } | |
707 | ||
708 | static void | |
709 | nfsd4_cb_layout_release(struct nfsd4_callback *cb) | |
710 | { | |
711 | struct nfs4_layout_stateid *ls = | |
712 | container_of(cb, struct nfs4_layout_stateid, ls_recall); | |
713 | LIST_HEAD(reaplist); | |
714 | ||
31ef83dc CH |
715 | trace_layout_recall_release(&ls->ls_stid.sc_stateid); |
716 | ||
c5c707f9 CH |
717 | nfsd4_return_all_layouts(ls, &reaplist); |
718 | nfsd4_free_layouts(&reaplist); | |
719 | nfs4_put_stid(&ls->ls_stid); | |
720 | } | |
721 | ||
c4cb8974 | 722 | static const struct nfsd4_callback_ops nfsd4_cb_layout_ops = { |
cc8a5532 | 723 | .prepare = nfsd4_cb_layout_prepare, |
c5c707f9 CH |
724 | .done = nfsd4_cb_layout_done, |
725 | .release = nfsd4_cb_layout_release, | |
726 | }; | |
727 | ||
728 | static bool | |
729 | nfsd4_layout_lm_break(struct file_lock *fl) | |
730 | { | |
731 | /* | |
732 | * We don't want the locks code to timeout the lease for us; | |
733 | * we'll remove it ourself if a layout isn't returned | |
734 | * in time: | |
735 | */ | |
736 | fl->fl_break_time = 0; | |
737 | nfsd4_recall_file_layout(fl->fl_owner); | |
738 | return false; | |
739 | } | |
740 | ||
741 | static int | |
742 | nfsd4_layout_lm_change(struct file_lock *onlist, int arg, | |
743 | struct list_head *dispose) | |
744 | { | |
745 | BUG_ON(!(arg & F_UNLCK)); | |
746 | return lease_modify(onlist, arg, dispose); | |
747 | } | |
748 | ||
749 | static const struct lock_manager_operations nfsd4_layouts_lm_ops = { | |
750 | .lm_break = nfsd4_layout_lm_break, | |
751 | .lm_change = nfsd4_layout_lm_change, | |
752 | }; | |
753 | ||
9cf514cc CH |
754 | int |
755 | nfsd4_init_pnfs(void) | |
756 | { | |
757 | int i; | |
758 | ||
759 | for (i = 0; i < DEVID_HASH_SIZE; i++) | |
760 | INIT_LIST_HEAD(&nfsd_devid_hash[i]); | |
761 | ||
762 | nfs4_layout_cache = kmem_cache_create("nfs4_layout", | |
763 | sizeof(struct nfs4_layout), 0, 0, NULL); | |
764 | if (!nfs4_layout_cache) | |
765 | return -ENOMEM; | |
766 | ||
767 | nfs4_layout_stateid_cache = kmem_cache_create("nfs4_layout_stateid", | |
768 | sizeof(struct nfs4_layout_stateid), 0, 0, NULL); | |
769 | if (!nfs4_layout_stateid_cache) { | |
770 | kmem_cache_destroy(nfs4_layout_cache); | |
771 | return -ENOMEM; | |
772 | } | |
773 | return 0; | |
774 | } | |
775 | ||
776 | void | |
777 | nfsd4_exit_pnfs(void) | |
778 | { | |
779 | int i; | |
780 | ||
781 | kmem_cache_destroy(nfs4_layout_cache); | |
782 | kmem_cache_destroy(nfs4_layout_stateid_cache); | |
783 | ||
784 | for (i = 0; i < DEVID_HASH_SIZE; i++) { | |
785 | struct nfsd4_deviceid_map *map, *n; | |
786 | ||
787 | list_for_each_entry_safe(map, n, &nfsd_devid_hash[i], hash) | |
788 | kfree(map); | |
789 | } | |
790 | } |