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1 | #include <linux/ceph/ceph_debug.h> | |
2 | ||
3 | #include <linux/fs.h> | |
4 | #include <linux/kernel.h> | |
5 | #include <linux/sched.h> | |
6 | #include <linux/slab.h> | |
7 | #include <linux/vmalloc.h> | |
8 | #include <linux/wait.h> | |
9 | #include <linux/writeback.h> | |
10 | ||
11 | #include "super.h" | |
12 | #include "mds_client.h" | |
13 | #include <linux/ceph/decode.h> | |
14 | #include <linux/ceph/messenger.h> | |
15 | ||
16 | /* | |
17 | * Capability management | |
18 | * | |
19 | * The Ceph metadata servers control client access to inode metadata | |
20 | * and file data by issuing capabilities, granting clients permission | |
21 | * to read and/or write both inode field and file data to OSDs | |
22 | * (storage nodes). Each capability consists of a set of bits | |
23 | * indicating which operations are allowed. | |
24 | * | |
25 | * If the client holds a *_SHARED cap, the client has a coherent value | |
26 | * that can be safely read from the cached inode. | |
27 | * | |
28 | * In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the | |
29 | * client is allowed to change inode attributes (e.g., file size, | |
30 | * mtime), note its dirty state in the ceph_cap, and asynchronously | |
31 | * flush that metadata change to the MDS. | |
32 | * | |
33 | * In the event of a conflicting operation (perhaps by another | |
34 | * client), the MDS will revoke the conflicting client capabilities. | |
35 | * | |
36 | * In order for a client to cache an inode, it must hold a capability | |
37 | * with at least one MDS server. When inodes are released, release | |
38 | * notifications are batched and periodically sent en masse to the MDS | |
39 | * cluster to release server state. | |
40 | */ | |
41 | ||
42 | ||
43 | /* | |
44 | * Generate readable cap strings for debugging output. | |
45 | */ | |
46 | #define MAX_CAP_STR 20 | |
47 | static char cap_str[MAX_CAP_STR][40]; | |
48 | static DEFINE_SPINLOCK(cap_str_lock); | |
49 | static int last_cap_str; | |
50 | ||
51 | static char *gcap_string(char *s, int c) | |
52 | { | |
53 | if (c & CEPH_CAP_GSHARED) | |
54 | *s++ = 's'; | |
55 | if (c & CEPH_CAP_GEXCL) | |
56 | *s++ = 'x'; | |
57 | if (c & CEPH_CAP_GCACHE) | |
58 | *s++ = 'c'; | |
59 | if (c & CEPH_CAP_GRD) | |
60 | *s++ = 'r'; | |
61 | if (c & CEPH_CAP_GWR) | |
62 | *s++ = 'w'; | |
63 | if (c & CEPH_CAP_GBUFFER) | |
64 | *s++ = 'b'; | |
65 | if (c & CEPH_CAP_GLAZYIO) | |
66 | *s++ = 'l'; | |
67 | return s; | |
68 | } | |
69 | ||
70 | const char *ceph_cap_string(int caps) | |
71 | { | |
72 | int i; | |
73 | char *s; | |
74 | int c; | |
75 | ||
76 | spin_lock(&cap_str_lock); | |
77 | i = last_cap_str++; | |
78 | if (last_cap_str == MAX_CAP_STR) | |
79 | last_cap_str = 0; | |
80 | spin_unlock(&cap_str_lock); | |
81 | ||
82 | s = cap_str[i]; | |
83 | ||
84 | if (caps & CEPH_CAP_PIN) | |
85 | *s++ = 'p'; | |
86 | ||
87 | c = (caps >> CEPH_CAP_SAUTH) & 3; | |
88 | if (c) { | |
89 | *s++ = 'A'; | |
90 | s = gcap_string(s, c); | |
91 | } | |
92 | ||
93 | c = (caps >> CEPH_CAP_SLINK) & 3; | |
94 | if (c) { | |
95 | *s++ = 'L'; | |
96 | s = gcap_string(s, c); | |
97 | } | |
98 | ||
99 | c = (caps >> CEPH_CAP_SXATTR) & 3; | |
100 | if (c) { | |
101 | *s++ = 'X'; | |
102 | s = gcap_string(s, c); | |
103 | } | |
104 | ||
105 | c = caps >> CEPH_CAP_SFILE; | |
106 | if (c) { | |
107 | *s++ = 'F'; | |
108 | s = gcap_string(s, c); | |
109 | } | |
110 | ||
111 | if (s == cap_str[i]) | |
112 | *s++ = '-'; | |
113 | *s = 0; | |
114 | return cap_str[i]; | |
115 | } | |
116 | ||
117 | void ceph_caps_init(struct ceph_mds_client *mdsc) | |
118 | { | |
119 | INIT_LIST_HEAD(&mdsc->caps_list); | |
120 | spin_lock_init(&mdsc->caps_list_lock); | |
121 | } | |
122 | ||
123 | void ceph_caps_finalize(struct ceph_mds_client *mdsc) | |
124 | { | |
125 | struct ceph_cap *cap; | |
126 | ||
127 | spin_lock(&mdsc->caps_list_lock); | |
128 | while (!list_empty(&mdsc->caps_list)) { | |
129 | cap = list_first_entry(&mdsc->caps_list, | |
130 | struct ceph_cap, caps_item); | |
131 | list_del(&cap->caps_item); | |
132 | kmem_cache_free(ceph_cap_cachep, cap); | |
133 | } | |
134 | mdsc->caps_total_count = 0; | |
135 | mdsc->caps_avail_count = 0; | |
136 | mdsc->caps_use_count = 0; | |
137 | mdsc->caps_reserve_count = 0; | |
138 | mdsc->caps_min_count = 0; | |
139 | spin_unlock(&mdsc->caps_list_lock); | |
140 | } | |
141 | ||
142 | void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta) | |
143 | { | |
144 | spin_lock(&mdsc->caps_list_lock); | |
145 | mdsc->caps_min_count += delta; | |
146 | BUG_ON(mdsc->caps_min_count < 0); | |
147 | spin_unlock(&mdsc->caps_list_lock); | |
148 | } | |
149 | ||
150 | int ceph_reserve_caps(struct ceph_mds_client *mdsc, | |
151 | struct ceph_cap_reservation *ctx, int need) | |
152 | { | |
153 | int i; | |
154 | struct ceph_cap *cap; | |
155 | int have; | |
156 | int alloc = 0; | |
157 | LIST_HEAD(newcaps); | |
158 | int ret = 0; | |
159 | ||
160 | dout("reserve caps ctx=%p need=%d\n", ctx, need); | |
161 | ||
162 | /* first reserve any caps that are already allocated */ | |
163 | spin_lock(&mdsc->caps_list_lock); | |
164 | if (mdsc->caps_avail_count >= need) | |
165 | have = need; | |
166 | else | |
167 | have = mdsc->caps_avail_count; | |
168 | mdsc->caps_avail_count -= have; | |
169 | mdsc->caps_reserve_count += have; | |
170 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + | |
171 | mdsc->caps_reserve_count + | |
172 | mdsc->caps_avail_count); | |
173 | spin_unlock(&mdsc->caps_list_lock); | |
174 | ||
175 | for (i = have; i < need; i++) { | |
176 | cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); | |
177 | if (!cap) { | |
178 | ret = -ENOMEM; | |
179 | goto out_alloc_count; | |
180 | } | |
181 | list_add(&cap->caps_item, &newcaps); | |
182 | alloc++; | |
183 | } | |
184 | BUG_ON(have + alloc != need); | |
185 | ||
186 | spin_lock(&mdsc->caps_list_lock); | |
187 | mdsc->caps_total_count += alloc; | |
188 | mdsc->caps_reserve_count += alloc; | |
189 | list_splice(&newcaps, &mdsc->caps_list); | |
190 | ||
191 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + | |
192 | mdsc->caps_reserve_count + | |
193 | mdsc->caps_avail_count); | |
194 | spin_unlock(&mdsc->caps_list_lock); | |
195 | ||
196 | ctx->count = need; | |
197 | dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", | |
198 | ctx, mdsc->caps_total_count, mdsc->caps_use_count, | |
199 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
200 | return 0; | |
201 | ||
202 | out_alloc_count: | |
203 | /* we didn't manage to reserve as much as we needed */ | |
204 | pr_warning("reserve caps ctx=%p ENOMEM need=%d got=%d\n", | |
205 | ctx, need, have); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | int ceph_unreserve_caps(struct ceph_mds_client *mdsc, | |
210 | struct ceph_cap_reservation *ctx) | |
211 | { | |
212 | dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count); | |
213 | if (ctx->count) { | |
214 | spin_lock(&mdsc->caps_list_lock); | |
215 | BUG_ON(mdsc->caps_reserve_count < ctx->count); | |
216 | mdsc->caps_reserve_count -= ctx->count; | |
217 | mdsc->caps_avail_count += ctx->count; | |
218 | ctx->count = 0; | |
219 | dout("unreserve caps %d = %d used + %d resv + %d avail\n", | |
220 | mdsc->caps_total_count, mdsc->caps_use_count, | |
221 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
222 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + | |
223 | mdsc->caps_reserve_count + | |
224 | mdsc->caps_avail_count); | |
225 | spin_unlock(&mdsc->caps_list_lock); | |
226 | } | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc, | |
231 | struct ceph_cap_reservation *ctx) | |
232 | { | |
233 | struct ceph_cap *cap = NULL; | |
234 | ||
235 | /* temporary, until we do something about cap import/export */ | |
236 | if (!ctx) { | |
237 | cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); | |
238 | if (cap) { | |
239 | mdsc->caps_use_count++; | |
240 | mdsc->caps_total_count++; | |
241 | } | |
242 | return cap; | |
243 | } | |
244 | ||
245 | spin_lock(&mdsc->caps_list_lock); | |
246 | dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n", | |
247 | ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, | |
248 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
249 | BUG_ON(!ctx->count); | |
250 | BUG_ON(ctx->count > mdsc->caps_reserve_count); | |
251 | BUG_ON(list_empty(&mdsc->caps_list)); | |
252 | ||
253 | ctx->count--; | |
254 | mdsc->caps_reserve_count--; | |
255 | mdsc->caps_use_count++; | |
256 | ||
257 | cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); | |
258 | list_del(&cap->caps_item); | |
259 | ||
260 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + | |
261 | mdsc->caps_reserve_count + mdsc->caps_avail_count); | |
262 | spin_unlock(&mdsc->caps_list_lock); | |
263 | return cap; | |
264 | } | |
265 | ||
266 | void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) | |
267 | { | |
268 | spin_lock(&mdsc->caps_list_lock); | |
269 | dout("put_cap %p %d = %d used + %d resv + %d avail\n", | |
270 | cap, mdsc->caps_total_count, mdsc->caps_use_count, | |
271 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
272 | mdsc->caps_use_count--; | |
273 | /* | |
274 | * Keep some preallocated caps around (ceph_min_count), to | |
275 | * avoid lots of free/alloc churn. | |
276 | */ | |
277 | if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + | |
278 | mdsc->caps_min_count) { | |
279 | mdsc->caps_total_count--; | |
280 | kmem_cache_free(ceph_cap_cachep, cap); | |
281 | } else { | |
282 | mdsc->caps_avail_count++; | |
283 | list_add(&cap->caps_item, &mdsc->caps_list); | |
284 | } | |
285 | ||
286 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + | |
287 | mdsc->caps_reserve_count + mdsc->caps_avail_count); | |
288 | spin_unlock(&mdsc->caps_list_lock); | |
289 | } | |
290 | ||
291 | void ceph_reservation_status(struct ceph_fs_client *fsc, | |
292 | int *total, int *avail, int *used, int *reserved, | |
293 | int *min) | |
294 | { | |
295 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
296 | ||
297 | if (total) | |
298 | *total = mdsc->caps_total_count; | |
299 | if (avail) | |
300 | *avail = mdsc->caps_avail_count; | |
301 | if (used) | |
302 | *used = mdsc->caps_use_count; | |
303 | if (reserved) | |
304 | *reserved = mdsc->caps_reserve_count; | |
305 | if (min) | |
306 | *min = mdsc->caps_min_count; | |
307 | } | |
308 | ||
309 | /* | |
310 | * Find ceph_cap for given mds, if any. | |
311 | * | |
312 | * Called with i_lock held. | |
313 | */ | |
314 | static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) | |
315 | { | |
316 | struct ceph_cap *cap; | |
317 | struct rb_node *n = ci->i_caps.rb_node; | |
318 | ||
319 | while (n) { | |
320 | cap = rb_entry(n, struct ceph_cap, ci_node); | |
321 | if (mds < cap->mds) | |
322 | n = n->rb_left; | |
323 | else if (mds > cap->mds) | |
324 | n = n->rb_right; | |
325 | else | |
326 | return cap; | |
327 | } | |
328 | return NULL; | |
329 | } | |
330 | ||
331 | struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) | |
332 | { | |
333 | struct ceph_cap *cap; | |
334 | ||
335 | spin_lock(&ci->vfs_inode.i_lock); | |
336 | cap = __get_cap_for_mds(ci, mds); | |
337 | spin_unlock(&ci->vfs_inode.i_lock); | |
338 | return cap; | |
339 | } | |
340 | ||
341 | /* | |
342 | * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1. | |
343 | */ | |
344 | static int __ceph_get_cap_mds(struct ceph_inode_info *ci) | |
345 | { | |
346 | struct ceph_cap *cap; | |
347 | int mds = -1; | |
348 | struct rb_node *p; | |
349 | ||
350 | /* prefer mds with WR|BUFFER|EXCL caps */ | |
351 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
352 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
353 | mds = cap->mds; | |
354 | if (cap->issued & (CEPH_CAP_FILE_WR | | |
355 | CEPH_CAP_FILE_BUFFER | | |
356 | CEPH_CAP_FILE_EXCL)) | |
357 | break; | |
358 | } | |
359 | return mds; | |
360 | } | |
361 | ||
362 | int ceph_get_cap_mds(struct inode *inode) | |
363 | { | |
364 | int mds; | |
365 | spin_lock(&inode->i_lock); | |
366 | mds = __ceph_get_cap_mds(ceph_inode(inode)); | |
367 | spin_unlock(&inode->i_lock); | |
368 | return mds; | |
369 | } | |
370 | ||
371 | /* | |
372 | * Called under i_lock. | |
373 | */ | |
374 | static void __insert_cap_node(struct ceph_inode_info *ci, | |
375 | struct ceph_cap *new) | |
376 | { | |
377 | struct rb_node **p = &ci->i_caps.rb_node; | |
378 | struct rb_node *parent = NULL; | |
379 | struct ceph_cap *cap = NULL; | |
380 | ||
381 | while (*p) { | |
382 | parent = *p; | |
383 | cap = rb_entry(parent, struct ceph_cap, ci_node); | |
384 | if (new->mds < cap->mds) | |
385 | p = &(*p)->rb_left; | |
386 | else if (new->mds > cap->mds) | |
387 | p = &(*p)->rb_right; | |
388 | else | |
389 | BUG(); | |
390 | } | |
391 | ||
392 | rb_link_node(&new->ci_node, parent, p); | |
393 | rb_insert_color(&new->ci_node, &ci->i_caps); | |
394 | } | |
395 | ||
396 | /* | |
397 | * (re)set cap hold timeouts, which control the delayed release | |
398 | * of unused caps back to the MDS. Should be called on cap use. | |
399 | */ | |
400 | static void __cap_set_timeouts(struct ceph_mds_client *mdsc, | |
401 | struct ceph_inode_info *ci) | |
402 | { | |
403 | struct ceph_mount_options *ma = mdsc->fsc->mount_options; | |
404 | ||
405 | ci->i_hold_caps_min = round_jiffies(jiffies + | |
406 | ma->caps_wanted_delay_min * HZ); | |
407 | ci->i_hold_caps_max = round_jiffies(jiffies + | |
408 | ma->caps_wanted_delay_max * HZ); | |
409 | dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode, | |
410 | ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies); | |
411 | } | |
412 | ||
413 | /* | |
414 | * (Re)queue cap at the end of the delayed cap release list. | |
415 | * | |
416 | * If I_FLUSH is set, leave the inode at the front of the list. | |
417 | * | |
418 | * Caller holds i_lock | |
419 | * -> we take mdsc->cap_delay_lock | |
420 | */ | |
421 | static void __cap_delay_requeue(struct ceph_mds_client *mdsc, | |
422 | struct ceph_inode_info *ci) | |
423 | { | |
424 | __cap_set_timeouts(mdsc, ci); | |
425 | dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode, | |
426 | ci->i_ceph_flags, ci->i_hold_caps_max); | |
427 | if (!mdsc->stopping) { | |
428 | spin_lock(&mdsc->cap_delay_lock); | |
429 | if (!list_empty(&ci->i_cap_delay_list)) { | |
430 | if (ci->i_ceph_flags & CEPH_I_FLUSH) | |
431 | goto no_change; | |
432 | list_del_init(&ci->i_cap_delay_list); | |
433 | } | |
434 | list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); | |
435 | no_change: | |
436 | spin_unlock(&mdsc->cap_delay_lock); | |
437 | } | |
438 | } | |
439 | ||
440 | /* | |
441 | * Queue an inode for immediate writeback. Mark inode with I_FLUSH, | |
442 | * indicating we should send a cap message to flush dirty metadata | |
443 | * asap, and move to the front of the delayed cap list. | |
444 | */ | |
445 | static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, | |
446 | struct ceph_inode_info *ci) | |
447 | { | |
448 | dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode); | |
449 | spin_lock(&mdsc->cap_delay_lock); | |
450 | ci->i_ceph_flags |= CEPH_I_FLUSH; | |
451 | if (!list_empty(&ci->i_cap_delay_list)) | |
452 | list_del_init(&ci->i_cap_delay_list); | |
453 | list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); | |
454 | spin_unlock(&mdsc->cap_delay_lock); | |
455 | } | |
456 | ||
457 | /* | |
458 | * Cancel delayed work on cap. | |
459 | * | |
460 | * Caller must hold i_lock. | |
461 | */ | |
462 | static void __cap_delay_cancel(struct ceph_mds_client *mdsc, | |
463 | struct ceph_inode_info *ci) | |
464 | { | |
465 | dout("__cap_delay_cancel %p\n", &ci->vfs_inode); | |
466 | if (list_empty(&ci->i_cap_delay_list)) | |
467 | return; | |
468 | spin_lock(&mdsc->cap_delay_lock); | |
469 | list_del_init(&ci->i_cap_delay_list); | |
470 | spin_unlock(&mdsc->cap_delay_lock); | |
471 | } | |
472 | ||
473 | /* | |
474 | * Common issue checks for add_cap, handle_cap_grant. | |
475 | */ | |
476 | static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, | |
477 | unsigned issued) | |
478 | { | |
479 | unsigned had = __ceph_caps_issued(ci, NULL); | |
480 | ||
481 | /* | |
482 | * Each time we receive FILE_CACHE anew, we increment | |
483 | * i_rdcache_gen. | |
484 | */ | |
485 | if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && | |
486 | (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) | |
487 | ci->i_rdcache_gen++; | |
488 | ||
489 | /* | |
490 | * if we are newly issued FILE_SHARED, clear I_COMPLETE; we | |
491 | * don't know what happened to this directory while we didn't | |
492 | * have the cap. | |
493 | */ | |
494 | if ((issued & CEPH_CAP_FILE_SHARED) && | |
495 | (had & CEPH_CAP_FILE_SHARED) == 0) { | |
496 | ci->i_shared_gen++; | |
497 | if (S_ISDIR(ci->vfs_inode.i_mode)) { | |
498 | dout(" marking %p NOT complete\n", &ci->vfs_inode); | |
499 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
500 | } | |
501 | } | |
502 | } | |
503 | ||
504 | /* | |
505 | * Add a capability under the given MDS session. | |
506 | * | |
507 | * Caller should hold session snap_rwsem (read) and s_mutex. | |
508 | * | |
509 | * @fmode is the open file mode, if we are opening a file, otherwise | |
510 | * it is < 0. (This is so we can atomically add the cap and add an | |
511 | * open file reference to it.) | |
512 | */ | |
513 | int ceph_add_cap(struct inode *inode, | |
514 | struct ceph_mds_session *session, u64 cap_id, | |
515 | int fmode, unsigned issued, unsigned wanted, | |
516 | unsigned seq, unsigned mseq, u64 realmino, int flags, | |
517 | struct ceph_cap_reservation *caps_reservation) | |
518 | { | |
519 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; | |
520 | struct ceph_inode_info *ci = ceph_inode(inode); | |
521 | struct ceph_cap *new_cap = NULL; | |
522 | struct ceph_cap *cap; | |
523 | int mds = session->s_mds; | |
524 | int actual_wanted; | |
525 | ||
526 | dout("add_cap %p mds%d cap %llx %s seq %d\n", inode, | |
527 | session->s_mds, cap_id, ceph_cap_string(issued), seq); | |
528 | ||
529 | /* | |
530 | * If we are opening the file, include file mode wanted bits | |
531 | * in wanted. | |
532 | */ | |
533 | if (fmode >= 0) | |
534 | wanted |= ceph_caps_for_mode(fmode); | |
535 | ||
536 | retry: | |
537 | spin_lock(&inode->i_lock); | |
538 | cap = __get_cap_for_mds(ci, mds); | |
539 | if (!cap) { | |
540 | if (new_cap) { | |
541 | cap = new_cap; | |
542 | new_cap = NULL; | |
543 | } else { | |
544 | spin_unlock(&inode->i_lock); | |
545 | new_cap = get_cap(mdsc, caps_reservation); | |
546 | if (new_cap == NULL) | |
547 | return -ENOMEM; | |
548 | goto retry; | |
549 | } | |
550 | ||
551 | cap->issued = 0; | |
552 | cap->implemented = 0; | |
553 | cap->mds = mds; | |
554 | cap->mds_wanted = 0; | |
555 | ||
556 | cap->ci = ci; | |
557 | __insert_cap_node(ci, cap); | |
558 | ||
559 | /* clear out old exporting info? (i.e. on cap import) */ | |
560 | if (ci->i_cap_exporting_mds == mds) { | |
561 | ci->i_cap_exporting_issued = 0; | |
562 | ci->i_cap_exporting_mseq = 0; | |
563 | ci->i_cap_exporting_mds = -1; | |
564 | } | |
565 | ||
566 | /* add to session cap list */ | |
567 | cap->session = session; | |
568 | spin_lock(&session->s_cap_lock); | |
569 | list_add_tail(&cap->session_caps, &session->s_caps); | |
570 | session->s_nr_caps++; | |
571 | spin_unlock(&session->s_cap_lock); | |
572 | } else if (new_cap) | |
573 | ceph_put_cap(mdsc, new_cap); | |
574 | ||
575 | if (!ci->i_snap_realm) { | |
576 | /* | |
577 | * add this inode to the appropriate snap realm | |
578 | */ | |
579 | struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, | |
580 | realmino); | |
581 | if (realm) { | |
582 | ceph_get_snap_realm(mdsc, realm); | |
583 | spin_lock(&realm->inodes_with_caps_lock); | |
584 | ci->i_snap_realm = realm; | |
585 | list_add(&ci->i_snap_realm_item, | |
586 | &realm->inodes_with_caps); | |
587 | spin_unlock(&realm->inodes_with_caps_lock); | |
588 | } else { | |
589 | pr_err("ceph_add_cap: couldn't find snap realm %llx\n", | |
590 | realmino); | |
591 | WARN_ON(!realm); | |
592 | } | |
593 | } | |
594 | ||
595 | __check_cap_issue(ci, cap, issued); | |
596 | ||
597 | /* | |
598 | * If we are issued caps we don't want, or the mds' wanted | |
599 | * value appears to be off, queue a check so we'll release | |
600 | * later and/or update the mds wanted value. | |
601 | */ | |
602 | actual_wanted = __ceph_caps_wanted(ci); | |
603 | if ((wanted & ~actual_wanted) || | |
604 | (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { | |
605 | dout(" issued %s, mds wanted %s, actual %s, queueing\n", | |
606 | ceph_cap_string(issued), ceph_cap_string(wanted), | |
607 | ceph_cap_string(actual_wanted)); | |
608 | __cap_delay_requeue(mdsc, ci); | |
609 | } | |
610 | ||
611 | if (flags & CEPH_CAP_FLAG_AUTH) | |
612 | ci->i_auth_cap = cap; | |
613 | else if (ci->i_auth_cap == cap) | |
614 | ci->i_auth_cap = NULL; | |
615 | ||
616 | dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n", | |
617 | inode, ceph_vinop(inode), cap, ceph_cap_string(issued), | |
618 | ceph_cap_string(issued|cap->issued), seq, mds); | |
619 | cap->cap_id = cap_id; | |
620 | cap->issued = issued; | |
621 | cap->implemented |= issued; | |
622 | cap->mds_wanted |= wanted; | |
623 | cap->seq = seq; | |
624 | cap->issue_seq = seq; | |
625 | cap->mseq = mseq; | |
626 | cap->cap_gen = session->s_cap_gen; | |
627 | ||
628 | if (fmode >= 0) | |
629 | __ceph_get_fmode(ci, fmode); | |
630 | spin_unlock(&inode->i_lock); | |
631 | wake_up_all(&ci->i_cap_wq); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Return true if cap has not timed out and belongs to the current | |
637 | * generation of the MDS session (i.e. has not gone 'stale' due to | |
638 | * us losing touch with the mds). | |
639 | */ | |
640 | static int __cap_is_valid(struct ceph_cap *cap) | |
641 | { | |
642 | unsigned long ttl; | |
643 | u32 gen; | |
644 | ||
645 | spin_lock(&cap->session->s_cap_lock); | |
646 | gen = cap->session->s_cap_gen; | |
647 | ttl = cap->session->s_cap_ttl; | |
648 | spin_unlock(&cap->session->s_cap_lock); | |
649 | ||
650 | if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { | |
651 | dout("__cap_is_valid %p cap %p issued %s " | |
652 | "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode, | |
653 | cap, ceph_cap_string(cap->issued), cap->cap_gen, gen); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | return 1; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Return set of valid cap bits issued to us. Note that caps time | |
662 | * out, and may be invalidated in bulk if the client session times out | |
663 | * and session->s_cap_gen is bumped. | |
664 | */ | |
665 | int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) | |
666 | { | |
667 | int have = ci->i_snap_caps | ci->i_cap_exporting_issued; | |
668 | struct ceph_cap *cap; | |
669 | struct rb_node *p; | |
670 | ||
671 | if (implemented) | |
672 | *implemented = 0; | |
673 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
674 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
675 | if (!__cap_is_valid(cap)) | |
676 | continue; | |
677 | dout("__ceph_caps_issued %p cap %p issued %s\n", | |
678 | &ci->vfs_inode, cap, ceph_cap_string(cap->issued)); | |
679 | have |= cap->issued; | |
680 | if (implemented) | |
681 | *implemented |= cap->implemented; | |
682 | } | |
683 | return have; | |
684 | } | |
685 | ||
686 | /* | |
687 | * Get cap bits issued by caps other than @ocap | |
688 | */ | |
689 | int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) | |
690 | { | |
691 | int have = ci->i_snap_caps; | |
692 | struct ceph_cap *cap; | |
693 | struct rb_node *p; | |
694 | ||
695 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
696 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
697 | if (cap == ocap) | |
698 | continue; | |
699 | if (!__cap_is_valid(cap)) | |
700 | continue; | |
701 | have |= cap->issued; | |
702 | } | |
703 | return have; | |
704 | } | |
705 | ||
706 | /* | |
707 | * Move a cap to the end of the LRU (oldest caps at list head, newest | |
708 | * at list tail). | |
709 | */ | |
710 | static void __touch_cap(struct ceph_cap *cap) | |
711 | { | |
712 | struct ceph_mds_session *s = cap->session; | |
713 | ||
714 | spin_lock(&s->s_cap_lock); | |
715 | if (s->s_cap_iterator == NULL) { | |
716 | dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, | |
717 | s->s_mds); | |
718 | list_move_tail(&cap->session_caps, &s->s_caps); | |
719 | } else { | |
720 | dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", | |
721 | &cap->ci->vfs_inode, cap, s->s_mds); | |
722 | } | |
723 | spin_unlock(&s->s_cap_lock); | |
724 | } | |
725 | ||
726 | /* | |
727 | * Check if we hold the given mask. If so, move the cap(s) to the | |
728 | * front of their respective LRUs. (This is the preferred way for | |
729 | * callers to check for caps they want.) | |
730 | */ | |
731 | int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) | |
732 | { | |
733 | struct ceph_cap *cap; | |
734 | struct rb_node *p; | |
735 | int have = ci->i_snap_caps; | |
736 | ||
737 | if ((have & mask) == mask) { | |
738 | dout("__ceph_caps_issued_mask %p snap issued %s" | |
739 | " (mask %s)\n", &ci->vfs_inode, | |
740 | ceph_cap_string(have), | |
741 | ceph_cap_string(mask)); | |
742 | return 1; | |
743 | } | |
744 | ||
745 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
746 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
747 | if (!__cap_is_valid(cap)) | |
748 | continue; | |
749 | if ((cap->issued & mask) == mask) { | |
750 | dout("__ceph_caps_issued_mask %p cap %p issued %s" | |
751 | " (mask %s)\n", &ci->vfs_inode, cap, | |
752 | ceph_cap_string(cap->issued), | |
753 | ceph_cap_string(mask)); | |
754 | if (touch) | |
755 | __touch_cap(cap); | |
756 | return 1; | |
757 | } | |
758 | ||
759 | /* does a combination of caps satisfy mask? */ | |
760 | have |= cap->issued; | |
761 | if ((have & mask) == mask) { | |
762 | dout("__ceph_caps_issued_mask %p combo issued %s" | |
763 | " (mask %s)\n", &ci->vfs_inode, | |
764 | ceph_cap_string(cap->issued), | |
765 | ceph_cap_string(mask)); | |
766 | if (touch) { | |
767 | struct rb_node *q; | |
768 | ||
769 | /* touch this + preceding caps */ | |
770 | __touch_cap(cap); | |
771 | for (q = rb_first(&ci->i_caps); q != p; | |
772 | q = rb_next(q)) { | |
773 | cap = rb_entry(q, struct ceph_cap, | |
774 | ci_node); | |
775 | if (!__cap_is_valid(cap)) | |
776 | continue; | |
777 | __touch_cap(cap); | |
778 | } | |
779 | } | |
780 | return 1; | |
781 | } | |
782 | } | |
783 | ||
784 | return 0; | |
785 | } | |
786 | ||
787 | /* | |
788 | * Return true if mask caps are currently being revoked by an MDS. | |
789 | */ | |
790 | int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) | |
791 | { | |
792 | struct inode *inode = &ci->vfs_inode; | |
793 | struct ceph_cap *cap; | |
794 | struct rb_node *p; | |
795 | int ret = 0; | |
796 | ||
797 | spin_lock(&inode->i_lock); | |
798 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
799 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
800 | if (__cap_is_valid(cap) && | |
801 | (cap->implemented & ~cap->issued & mask)) { | |
802 | ret = 1; | |
803 | break; | |
804 | } | |
805 | } | |
806 | spin_unlock(&inode->i_lock); | |
807 | dout("ceph_caps_revoking %p %s = %d\n", inode, | |
808 | ceph_cap_string(mask), ret); | |
809 | return ret; | |
810 | } | |
811 | ||
812 | int __ceph_caps_used(struct ceph_inode_info *ci) | |
813 | { | |
814 | int used = 0; | |
815 | if (ci->i_pin_ref) | |
816 | used |= CEPH_CAP_PIN; | |
817 | if (ci->i_rd_ref) | |
818 | used |= CEPH_CAP_FILE_RD; | |
819 | if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages) | |
820 | used |= CEPH_CAP_FILE_CACHE; | |
821 | if (ci->i_wr_ref) | |
822 | used |= CEPH_CAP_FILE_WR; | |
823 | if (ci->i_wb_ref || ci->i_wrbuffer_ref) | |
824 | used |= CEPH_CAP_FILE_BUFFER; | |
825 | return used; | |
826 | } | |
827 | ||
828 | /* | |
829 | * wanted, by virtue of open file modes | |
830 | */ | |
831 | int __ceph_caps_file_wanted(struct ceph_inode_info *ci) | |
832 | { | |
833 | int want = 0; | |
834 | int mode; | |
835 | for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++) | |
836 | if (ci->i_nr_by_mode[mode]) | |
837 | want |= ceph_caps_for_mode(mode); | |
838 | return want; | |
839 | } | |
840 | ||
841 | /* | |
842 | * Return caps we have registered with the MDS(s) as 'wanted'. | |
843 | */ | |
844 | int __ceph_caps_mds_wanted(struct ceph_inode_info *ci) | |
845 | { | |
846 | struct ceph_cap *cap; | |
847 | struct rb_node *p; | |
848 | int mds_wanted = 0; | |
849 | ||
850 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
851 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
852 | if (!__cap_is_valid(cap)) | |
853 | continue; | |
854 | mds_wanted |= cap->mds_wanted; | |
855 | } | |
856 | return mds_wanted; | |
857 | } | |
858 | ||
859 | /* | |
860 | * called under i_lock | |
861 | */ | |
862 | static int __ceph_is_any_caps(struct ceph_inode_info *ci) | |
863 | { | |
864 | return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0; | |
865 | } | |
866 | ||
867 | /* | |
868 | * Remove a cap. Take steps to deal with a racing iterate_session_caps. | |
869 | * | |
870 | * caller should hold i_lock. | |
871 | * caller will not hold session s_mutex if called from destroy_inode. | |
872 | */ | |
873 | void __ceph_remove_cap(struct ceph_cap *cap) | |
874 | { | |
875 | struct ceph_mds_session *session = cap->session; | |
876 | struct ceph_inode_info *ci = cap->ci; | |
877 | struct ceph_mds_client *mdsc = | |
878 | ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; | |
879 | int removed = 0; | |
880 | ||
881 | dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode); | |
882 | ||
883 | /* remove from session list */ | |
884 | spin_lock(&session->s_cap_lock); | |
885 | if (session->s_cap_iterator == cap) { | |
886 | /* not yet, we are iterating over this very cap */ | |
887 | dout("__ceph_remove_cap delaying %p removal from session %p\n", | |
888 | cap, cap->session); | |
889 | } else { | |
890 | list_del_init(&cap->session_caps); | |
891 | session->s_nr_caps--; | |
892 | cap->session = NULL; | |
893 | removed = 1; | |
894 | } | |
895 | /* protect backpointer with s_cap_lock: see iterate_session_caps */ | |
896 | cap->ci = NULL; | |
897 | spin_unlock(&session->s_cap_lock); | |
898 | ||
899 | /* remove from inode list */ | |
900 | rb_erase(&cap->ci_node, &ci->i_caps); | |
901 | if (ci->i_auth_cap == cap) | |
902 | ci->i_auth_cap = NULL; | |
903 | ||
904 | if (removed) | |
905 | ceph_put_cap(mdsc, cap); | |
906 | ||
907 | if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) { | |
908 | struct ceph_snap_realm *realm = ci->i_snap_realm; | |
909 | spin_lock(&realm->inodes_with_caps_lock); | |
910 | list_del_init(&ci->i_snap_realm_item); | |
911 | ci->i_snap_realm_counter++; | |
912 | ci->i_snap_realm = NULL; | |
913 | spin_unlock(&realm->inodes_with_caps_lock); | |
914 | ceph_put_snap_realm(mdsc, realm); | |
915 | } | |
916 | if (!__ceph_is_any_real_caps(ci)) | |
917 | __cap_delay_cancel(mdsc, ci); | |
918 | } | |
919 | ||
920 | /* | |
921 | * Build and send a cap message to the given MDS. | |
922 | * | |
923 | * Caller should be holding s_mutex. | |
924 | */ | |
925 | static int send_cap_msg(struct ceph_mds_session *session, | |
926 | u64 ino, u64 cid, int op, | |
927 | int caps, int wanted, int dirty, | |
928 | u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq, | |
929 | u64 size, u64 max_size, | |
930 | struct timespec *mtime, struct timespec *atime, | |
931 | u64 time_warp_seq, | |
932 | uid_t uid, gid_t gid, mode_t mode, | |
933 | u64 xattr_version, | |
934 | struct ceph_buffer *xattrs_buf, | |
935 | u64 follows) | |
936 | { | |
937 | struct ceph_mds_caps *fc; | |
938 | struct ceph_msg *msg; | |
939 | ||
940 | dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s" | |
941 | " seq %u/%u mseq %u follows %lld size %llu/%llu" | |
942 | " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op), | |
943 | cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted), | |
944 | ceph_cap_string(dirty), | |
945 | seq, issue_seq, mseq, follows, size, max_size, | |
946 | xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0); | |
947 | ||
948 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS); | |
949 | if (!msg) | |
950 | return -ENOMEM; | |
951 | ||
952 | msg->hdr.tid = cpu_to_le64(flush_tid); | |
953 | ||
954 | fc = msg->front.iov_base; | |
955 | memset(fc, 0, sizeof(*fc)); | |
956 | ||
957 | fc->cap_id = cpu_to_le64(cid); | |
958 | fc->op = cpu_to_le32(op); | |
959 | fc->seq = cpu_to_le32(seq); | |
960 | fc->issue_seq = cpu_to_le32(issue_seq); | |
961 | fc->migrate_seq = cpu_to_le32(mseq); | |
962 | fc->caps = cpu_to_le32(caps); | |
963 | fc->wanted = cpu_to_le32(wanted); | |
964 | fc->dirty = cpu_to_le32(dirty); | |
965 | fc->ino = cpu_to_le64(ino); | |
966 | fc->snap_follows = cpu_to_le64(follows); | |
967 | ||
968 | fc->size = cpu_to_le64(size); | |
969 | fc->max_size = cpu_to_le64(max_size); | |
970 | if (mtime) | |
971 | ceph_encode_timespec(&fc->mtime, mtime); | |
972 | if (atime) | |
973 | ceph_encode_timespec(&fc->atime, atime); | |
974 | fc->time_warp_seq = cpu_to_le32(time_warp_seq); | |
975 | ||
976 | fc->uid = cpu_to_le32(uid); | |
977 | fc->gid = cpu_to_le32(gid); | |
978 | fc->mode = cpu_to_le32(mode); | |
979 | ||
980 | fc->xattr_version = cpu_to_le64(xattr_version); | |
981 | if (xattrs_buf) { | |
982 | msg->middle = ceph_buffer_get(xattrs_buf); | |
983 | fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len); | |
984 | msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len); | |
985 | } | |
986 | ||
987 | ceph_con_send(&session->s_con, msg); | |
988 | return 0; | |
989 | } | |
990 | ||
991 | static void __queue_cap_release(struct ceph_mds_session *session, | |
992 | u64 ino, u64 cap_id, u32 migrate_seq, | |
993 | u32 issue_seq) | |
994 | { | |
995 | struct ceph_msg *msg; | |
996 | struct ceph_mds_cap_release *head; | |
997 | struct ceph_mds_cap_item *item; | |
998 | ||
999 | spin_lock(&session->s_cap_lock); | |
1000 | BUG_ON(!session->s_num_cap_releases); | |
1001 | msg = list_first_entry(&session->s_cap_releases, | |
1002 | struct ceph_msg, list_head); | |
1003 | ||
1004 | dout(" adding %llx release to mds%d msg %p (%d left)\n", | |
1005 | ino, session->s_mds, msg, session->s_num_cap_releases); | |
1006 | ||
1007 | BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE); | |
1008 | head = msg->front.iov_base; | |
1009 | head->num = cpu_to_le32(le32_to_cpu(head->num) + 1); | |
1010 | item = msg->front.iov_base + msg->front.iov_len; | |
1011 | item->ino = cpu_to_le64(ino); | |
1012 | item->cap_id = cpu_to_le64(cap_id); | |
1013 | item->migrate_seq = cpu_to_le32(migrate_seq); | |
1014 | item->seq = cpu_to_le32(issue_seq); | |
1015 | ||
1016 | session->s_num_cap_releases--; | |
1017 | ||
1018 | msg->front.iov_len += sizeof(*item); | |
1019 | if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { | |
1020 | dout(" release msg %p full\n", msg); | |
1021 | list_move_tail(&msg->list_head, &session->s_cap_releases_done); | |
1022 | } else { | |
1023 | dout(" release msg %p at %d/%d (%d)\n", msg, | |
1024 | (int)le32_to_cpu(head->num), | |
1025 | (int)CEPH_CAPS_PER_RELEASE, | |
1026 | (int)msg->front.iov_len); | |
1027 | } | |
1028 | spin_unlock(&session->s_cap_lock); | |
1029 | } | |
1030 | ||
1031 | /* | |
1032 | * Queue cap releases when an inode is dropped from our cache. Since | |
1033 | * inode is about to be destroyed, there is no need for i_lock. | |
1034 | */ | |
1035 | void ceph_queue_caps_release(struct inode *inode) | |
1036 | { | |
1037 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1038 | struct rb_node *p; | |
1039 | ||
1040 | p = rb_first(&ci->i_caps); | |
1041 | while (p) { | |
1042 | struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); | |
1043 | struct ceph_mds_session *session = cap->session; | |
1044 | ||
1045 | __queue_cap_release(session, ceph_ino(inode), cap->cap_id, | |
1046 | cap->mseq, cap->issue_seq); | |
1047 | p = rb_next(p); | |
1048 | __ceph_remove_cap(cap); | |
1049 | } | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Send a cap msg on the given inode. Update our caps state, then | |
1054 | * drop i_lock and send the message. | |
1055 | * | |
1056 | * Make note of max_size reported/requested from mds, revoked caps | |
1057 | * that have now been implemented. | |
1058 | * | |
1059 | * Make half-hearted attempt ot to invalidate page cache if we are | |
1060 | * dropping RDCACHE. Note that this will leave behind locked pages | |
1061 | * that we'll then need to deal with elsewhere. | |
1062 | * | |
1063 | * Return non-zero if delayed release, or we experienced an error | |
1064 | * such that the caller should requeue + retry later. | |
1065 | * | |
1066 | * called with i_lock, then drops it. | |
1067 | * caller should hold snap_rwsem (read), s_mutex. | |
1068 | */ | |
1069 | static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap, | |
1070 | int op, int used, int want, int retain, int flushing, | |
1071 | unsigned *pflush_tid) | |
1072 | __releases(cap->ci->vfs_inode->i_lock) | |
1073 | { | |
1074 | struct ceph_inode_info *ci = cap->ci; | |
1075 | struct inode *inode = &ci->vfs_inode; | |
1076 | u64 cap_id = cap->cap_id; | |
1077 | int held, revoking, dropping, keep; | |
1078 | u64 seq, issue_seq, mseq, time_warp_seq, follows; | |
1079 | u64 size, max_size; | |
1080 | struct timespec mtime, atime; | |
1081 | int wake = 0; | |
1082 | mode_t mode; | |
1083 | uid_t uid; | |
1084 | gid_t gid; | |
1085 | struct ceph_mds_session *session; | |
1086 | u64 xattr_version = 0; | |
1087 | struct ceph_buffer *xattr_blob = NULL; | |
1088 | int delayed = 0; | |
1089 | u64 flush_tid = 0; | |
1090 | int i; | |
1091 | int ret; | |
1092 | ||
1093 | held = cap->issued | cap->implemented; | |
1094 | revoking = cap->implemented & ~cap->issued; | |
1095 | retain &= ~revoking; | |
1096 | dropping = cap->issued & ~retain; | |
1097 | ||
1098 | dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n", | |
1099 | inode, cap, cap->session, | |
1100 | ceph_cap_string(held), ceph_cap_string(held & retain), | |
1101 | ceph_cap_string(revoking)); | |
1102 | BUG_ON((retain & CEPH_CAP_PIN) == 0); | |
1103 | ||
1104 | session = cap->session; | |
1105 | ||
1106 | /* don't release wanted unless we've waited a bit. */ | |
1107 | if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && | |
1108 | time_before(jiffies, ci->i_hold_caps_min)) { | |
1109 | dout(" delaying issued %s -> %s, wanted %s -> %s on send\n", | |
1110 | ceph_cap_string(cap->issued), | |
1111 | ceph_cap_string(cap->issued & retain), | |
1112 | ceph_cap_string(cap->mds_wanted), | |
1113 | ceph_cap_string(want)); | |
1114 | want |= cap->mds_wanted; | |
1115 | retain |= cap->issued; | |
1116 | delayed = 1; | |
1117 | } | |
1118 | ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH); | |
1119 | ||
1120 | cap->issued &= retain; /* drop bits we don't want */ | |
1121 | if (cap->implemented & ~cap->issued) { | |
1122 | /* | |
1123 | * Wake up any waiters on wanted -> needed transition. | |
1124 | * This is due to the weird transition from buffered | |
1125 | * to sync IO... we need to flush dirty pages _before_ | |
1126 | * allowing sync writes to avoid reordering. | |
1127 | */ | |
1128 | wake = 1; | |
1129 | } | |
1130 | cap->implemented &= cap->issued | used; | |
1131 | cap->mds_wanted = want; | |
1132 | ||
1133 | if (flushing) { | |
1134 | /* | |
1135 | * assign a tid for flush operations so we can avoid | |
1136 | * flush1 -> dirty1 -> flush2 -> flushack1 -> mark | |
1137 | * clean type races. track latest tid for every bit | |
1138 | * so we can handle flush AxFw, flush Fw, and have the | |
1139 | * first ack clean Ax. | |
1140 | */ | |
1141 | flush_tid = ++ci->i_cap_flush_last_tid; | |
1142 | if (pflush_tid) | |
1143 | *pflush_tid = flush_tid; | |
1144 | dout(" cap_flush_tid %d\n", (int)flush_tid); | |
1145 | for (i = 0; i < CEPH_CAP_BITS; i++) | |
1146 | if (flushing & (1 << i)) | |
1147 | ci->i_cap_flush_tid[i] = flush_tid; | |
1148 | ||
1149 | follows = ci->i_head_snapc->seq; | |
1150 | } else { | |
1151 | follows = 0; | |
1152 | } | |
1153 | ||
1154 | keep = cap->implemented; | |
1155 | seq = cap->seq; | |
1156 | issue_seq = cap->issue_seq; | |
1157 | mseq = cap->mseq; | |
1158 | size = inode->i_size; | |
1159 | ci->i_reported_size = size; | |
1160 | max_size = ci->i_wanted_max_size; | |
1161 | ci->i_requested_max_size = max_size; | |
1162 | mtime = inode->i_mtime; | |
1163 | atime = inode->i_atime; | |
1164 | time_warp_seq = ci->i_time_warp_seq; | |
1165 | uid = inode->i_uid; | |
1166 | gid = inode->i_gid; | |
1167 | mode = inode->i_mode; | |
1168 | ||
1169 | if (flushing & CEPH_CAP_XATTR_EXCL) { | |
1170 | __ceph_build_xattrs_blob(ci); | |
1171 | xattr_blob = ci->i_xattrs.blob; | |
1172 | xattr_version = ci->i_xattrs.version; | |
1173 | } | |
1174 | ||
1175 | spin_unlock(&inode->i_lock); | |
1176 | ||
1177 | ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id, | |
1178 | op, keep, want, flushing, seq, flush_tid, issue_seq, mseq, | |
1179 | size, max_size, &mtime, &atime, time_warp_seq, | |
1180 | uid, gid, mode, xattr_version, xattr_blob, | |
1181 | follows); | |
1182 | if (ret < 0) { | |
1183 | dout("error sending cap msg, must requeue %p\n", inode); | |
1184 | delayed = 1; | |
1185 | } | |
1186 | ||
1187 | if (wake) | |
1188 | wake_up_all(&ci->i_cap_wq); | |
1189 | ||
1190 | return delayed; | |
1191 | } | |
1192 | ||
1193 | /* | |
1194 | * When a snapshot is taken, clients accumulate dirty metadata on | |
1195 | * inodes with capabilities in ceph_cap_snaps to describe the file | |
1196 | * state at the time the snapshot was taken. This must be flushed | |
1197 | * asynchronously back to the MDS once sync writes complete and dirty | |
1198 | * data is written out. | |
1199 | * | |
1200 | * Unless @again is true, skip cap_snaps that were already sent to | |
1201 | * the MDS (i.e., during this session). | |
1202 | * | |
1203 | * Called under i_lock. Takes s_mutex as needed. | |
1204 | */ | |
1205 | void __ceph_flush_snaps(struct ceph_inode_info *ci, | |
1206 | struct ceph_mds_session **psession, | |
1207 | int again) | |
1208 | __releases(ci->vfs_inode->i_lock) | |
1209 | __acquires(ci->vfs_inode->i_lock) | |
1210 | { | |
1211 | struct inode *inode = &ci->vfs_inode; | |
1212 | int mds; | |
1213 | struct ceph_cap_snap *capsnap; | |
1214 | u32 mseq; | |
1215 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; | |
1216 | struct ceph_mds_session *session = NULL; /* if session != NULL, we hold | |
1217 | session->s_mutex */ | |
1218 | u64 next_follows = 0; /* keep track of how far we've gotten through the | |
1219 | i_cap_snaps list, and skip these entries next time | |
1220 | around to avoid an infinite loop */ | |
1221 | ||
1222 | if (psession) | |
1223 | session = *psession; | |
1224 | ||
1225 | dout("__flush_snaps %p\n", inode); | |
1226 | retry: | |
1227 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
1228 | /* avoid an infiniute loop after retry */ | |
1229 | if (capsnap->follows < next_follows) | |
1230 | continue; | |
1231 | /* | |
1232 | * we need to wait for sync writes to complete and for dirty | |
1233 | * pages to be written out. | |
1234 | */ | |
1235 | if (capsnap->dirty_pages || capsnap->writing) | |
1236 | break; | |
1237 | ||
1238 | /* | |
1239 | * if cap writeback already occurred, we should have dropped | |
1240 | * the capsnap in ceph_put_wrbuffer_cap_refs. | |
1241 | */ | |
1242 | BUG_ON(capsnap->dirty == 0); | |
1243 | ||
1244 | /* pick mds, take s_mutex */ | |
1245 | if (ci->i_auth_cap == NULL) { | |
1246 | dout("no auth cap (migrating?), doing nothing\n"); | |
1247 | goto out; | |
1248 | } | |
1249 | ||
1250 | /* only flush each capsnap once */ | |
1251 | if (!again && !list_empty(&capsnap->flushing_item)) { | |
1252 | dout("already flushed %p, skipping\n", capsnap); | |
1253 | continue; | |
1254 | } | |
1255 | ||
1256 | mds = ci->i_auth_cap->session->s_mds; | |
1257 | mseq = ci->i_auth_cap->mseq; | |
1258 | ||
1259 | if (session && session->s_mds != mds) { | |
1260 | dout("oops, wrong session %p mutex\n", session); | |
1261 | mutex_unlock(&session->s_mutex); | |
1262 | ceph_put_mds_session(session); | |
1263 | session = NULL; | |
1264 | } | |
1265 | if (!session) { | |
1266 | spin_unlock(&inode->i_lock); | |
1267 | mutex_lock(&mdsc->mutex); | |
1268 | session = __ceph_lookup_mds_session(mdsc, mds); | |
1269 | mutex_unlock(&mdsc->mutex); | |
1270 | if (session) { | |
1271 | dout("inverting session/ino locks on %p\n", | |
1272 | session); | |
1273 | mutex_lock(&session->s_mutex); | |
1274 | } | |
1275 | /* | |
1276 | * if session == NULL, we raced against a cap | |
1277 | * deletion or migration. retry, and we'll | |
1278 | * get a better @mds value next time. | |
1279 | */ | |
1280 | spin_lock(&inode->i_lock); | |
1281 | goto retry; | |
1282 | } | |
1283 | ||
1284 | capsnap->flush_tid = ++ci->i_cap_flush_last_tid; | |
1285 | atomic_inc(&capsnap->nref); | |
1286 | if (!list_empty(&capsnap->flushing_item)) | |
1287 | list_del_init(&capsnap->flushing_item); | |
1288 | list_add_tail(&capsnap->flushing_item, | |
1289 | &session->s_cap_snaps_flushing); | |
1290 | spin_unlock(&inode->i_lock); | |
1291 | ||
1292 | dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n", | |
1293 | inode, capsnap, capsnap->follows, capsnap->flush_tid); | |
1294 | send_cap_msg(session, ceph_vino(inode).ino, 0, | |
1295 | CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0, | |
1296 | capsnap->dirty, 0, capsnap->flush_tid, 0, mseq, | |
1297 | capsnap->size, 0, | |
1298 | &capsnap->mtime, &capsnap->atime, | |
1299 | capsnap->time_warp_seq, | |
1300 | capsnap->uid, capsnap->gid, capsnap->mode, | |
1301 | capsnap->xattr_version, capsnap->xattr_blob, | |
1302 | capsnap->follows); | |
1303 | ||
1304 | next_follows = capsnap->follows + 1; | |
1305 | ceph_put_cap_snap(capsnap); | |
1306 | ||
1307 | spin_lock(&inode->i_lock); | |
1308 | goto retry; | |
1309 | } | |
1310 | ||
1311 | /* we flushed them all; remove this inode from the queue */ | |
1312 | spin_lock(&mdsc->snap_flush_lock); | |
1313 | list_del_init(&ci->i_snap_flush_item); | |
1314 | spin_unlock(&mdsc->snap_flush_lock); | |
1315 | ||
1316 | out: | |
1317 | if (psession) | |
1318 | *psession = session; | |
1319 | else if (session) { | |
1320 | mutex_unlock(&session->s_mutex); | |
1321 | ceph_put_mds_session(session); | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | static void ceph_flush_snaps(struct ceph_inode_info *ci) | |
1326 | { | |
1327 | struct inode *inode = &ci->vfs_inode; | |
1328 | ||
1329 | spin_lock(&inode->i_lock); | |
1330 | __ceph_flush_snaps(ci, NULL, 0); | |
1331 | spin_unlock(&inode->i_lock); | |
1332 | } | |
1333 | ||
1334 | /* | |
1335 | * Mark caps dirty. If inode is newly dirty, return the dirty flags. | |
1336 | * Caller is then responsible for calling __mark_inode_dirty with the | |
1337 | * returned flags value. | |
1338 | */ | |
1339 | int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask) | |
1340 | { | |
1341 | struct ceph_mds_client *mdsc = | |
1342 | ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; | |
1343 | struct inode *inode = &ci->vfs_inode; | |
1344 | int was = ci->i_dirty_caps; | |
1345 | int dirty = 0; | |
1346 | ||
1347 | dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode, | |
1348 | ceph_cap_string(mask), ceph_cap_string(was), | |
1349 | ceph_cap_string(was | mask)); | |
1350 | ci->i_dirty_caps |= mask; | |
1351 | if (was == 0) { | |
1352 | if (!ci->i_head_snapc) | |
1353 | ci->i_head_snapc = ceph_get_snap_context( | |
1354 | ci->i_snap_realm->cached_context); | |
1355 | dout(" inode %p now dirty snapc %p\n", &ci->vfs_inode, | |
1356 | ci->i_head_snapc); | |
1357 | BUG_ON(!list_empty(&ci->i_dirty_item)); | |
1358 | spin_lock(&mdsc->cap_dirty_lock); | |
1359 | list_add(&ci->i_dirty_item, &mdsc->cap_dirty); | |
1360 | spin_unlock(&mdsc->cap_dirty_lock); | |
1361 | if (ci->i_flushing_caps == 0) { | |
1362 | ihold(inode); | |
1363 | dirty |= I_DIRTY_SYNC; | |
1364 | } | |
1365 | } | |
1366 | BUG_ON(list_empty(&ci->i_dirty_item)); | |
1367 | if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && | |
1368 | (mask & CEPH_CAP_FILE_BUFFER)) | |
1369 | dirty |= I_DIRTY_DATASYNC; | |
1370 | __cap_delay_requeue(mdsc, ci); | |
1371 | return dirty; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Add dirty inode to the flushing list. Assigned a seq number so we | |
1376 | * can wait for caps to flush without starving. | |
1377 | * | |
1378 | * Called under i_lock. | |
1379 | */ | |
1380 | static int __mark_caps_flushing(struct inode *inode, | |
1381 | struct ceph_mds_session *session) | |
1382 | { | |
1383 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; | |
1384 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1385 | int flushing; | |
1386 | ||
1387 | BUG_ON(ci->i_dirty_caps == 0); | |
1388 | BUG_ON(list_empty(&ci->i_dirty_item)); | |
1389 | ||
1390 | flushing = ci->i_dirty_caps; | |
1391 | dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n", | |
1392 | ceph_cap_string(flushing), | |
1393 | ceph_cap_string(ci->i_flushing_caps), | |
1394 | ceph_cap_string(ci->i_flushing_caps | flushing)); | |
1395 | ci->i_flushing_caps |= flushing; | |
1396 | ci->i_dirty_caps = 0; | |
1397 | dout(" inode %p now !dirty\n", inode); | |
1398 | ||
1399 | spin_lock(&mdsc->cap_dirty_lock); | |
1400 | list_del_init(&ci->i_dirty_item); | |
1401 | ||
1402 | ci->i_cap_flush_seq = ++mdsc->cap_flush_seq; | |
1403 | if (list_empty(&ci->i_flushing_item)) { | |
1404 | list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); | |
1405 | mdsc->num_cap_flushing++; | |
1406 | dout(" inode %p now flushing seq %lld\n", inode, | |
1407 | ci->i_cap_flush_seq); | |
1408 | } else { | |
1409 | list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); | |
1410 | dout(" inode %p now flushing (more) seq %lld\n", inode, | |
1411 | ci->i_cap_flush_seq); | |
1412 | } | |
1413 | spin_unlock(&mdsc->cap_dirty_lock); | |
1414 | ||
1415 | return flushing; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * try to invalidate mapping pages without blocking. | |
1420 | */ | |
1421 | static int try_nonblocking_invalidate(struct inode *inode) | |
1422 | { | |
1423 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1424 | u32 invalidating_gen = ci->i_rdcache_gen; | |
1425 | ||
1426 | spin_unlock(&inode->i_lock); | |
1427 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
1428 | spin_lock(&inode->i_lock); | |
1429 | ||
1430 | if (inode->i_data.nrpages == 0 && | |
1431 | invalidating_gen == ci->i_rdcache_gen) { | |
1432 | /* success. */ | |
1433 | dout("try_nonblocking_invalidate %p success\n", inode); | |
1434 | /* save any racing async invalidate some trouble */ | |
1435 | ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; | |
1436 | return 0; | |
1437 | } | |
1438 | dout("try_nonblocking_invalidate %p failed\n", inode); | |
1439 | return -1; | |
1440 | } | |
1441 | ||
1442 | /* | |
1443 | * Swiss army knife function to examine currently used and wanted | |
1444 | * versus held caps. Release, flush, ack revoked caps to mds as | |
1445 | * appropriate. | |
1446 | * | |
1447 | * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay | |
1448 | * cap release further. | |
1449 | * CHECK_CAPS_AUTHONLY - we should only check the auth cap | |
1450 | * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without | |
1451 | * further delay. | |
1452 | */ | |
1453 | void ceph_check_caps(struct ceph_inode_info *ci, int flags, | |
1454 | struct ceph_mds_session *session) | |
1455 | { | |
1456 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); | |
1457 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
1458 | struct inode *inode = &ci->vfs_inode; | |
1459 | struct ceph_cap *cap; | |
1460 | int file_wanted, used; | |
1461 | int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */ | |
1462 | int issued, implemented, want, retain, revoking, flushing = 0; | |
1463 | int mds = -1; /* keep track of how far we've gone through i_caps list | |
1464 | to avoid an infinite loop on retry */ | |
1465 | struct rb_node *p; | |
1466 | int tried_invalidate = 0; | |
1467 | int delayed = 0, sent = 0, force_requeue = 0, num; | |
1468 | int queue_invalidate = 0; | |
1469 | int is_delayed = flags & CHECK_CAPS_NODELAY; | |
1470 | ||
1471 | /* if we are unmounting, flush any unused caps immediately. */ | |
1472 | if (mdsc->stopping) | |
1473 | is_delayed = 1; | |
1474 | ||
1475 | spin_lock(&inode->i_lock); | |
1476 | ||
1477 | if (ci->i_ceph_flags & CEPH_I_FLUSH) | |
1478 | flags |= CHECK_CAPS_FLUSH; | |
1479 | ||
1480 | /* flush snaps first time around only */ | |
1481 | if (!list_empty(&ci->i_cap_snaps)) | |
1482 | __ceph_flush_snaps(ci, &session, 0); | |
1483 | goto retry_locked; | |
1484 | retry: | |
1485 | spin_lock(&inode->i_lock); | |
1486 | retry_locked: | |
1487 | file_wanted = __ceph_caps_file_wanted(ci); | |
1488 | used = __ceph_caps_used(ci); | |
1489 | want = file_wanted | used; | |
1490 | issued = __ceph_caps_issued(ci, &implemented); | |
1491 | revoking = implemented & ~issued; | |
1492 | ||
1493 | retain = want | CEPH_CAP_PIN; | |
1494 | if (!mdsc->stopping && inode->i_nlink > 0) { | |
1495 | if (want) { | |
1496 | retain |= CEPH_CAP_ANY; /* be greedy */ | |
1497 | } else { | |
1498 | retain |= CEPH_CAP_ANY_SHARED; | |
1499 | /* | |
1500 | * keep RD only if we didn't have the file open RW, | |
1501 | * because then the mds would revoke it anyway to | |
1502 | * journal max_size=0. | |
1503 | */ | |
1504 | if (ci->i_max_size == 0) | |
1505 | retain |= CEPH_CAP_ANY_RD; | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | dout("check_caps %p file_want %s used %s dirty %s flushing %s" | |
1510 | " issued %s revoking %s retain %s %s%s%s\n", inode, | |
1511 | ceph_cap_string(file_wanted), | |
1512 | ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), | |
1513 | ceph_cap_string(ci->i_flushing_caps), | |
1514 | ceph_cap_string(issued), ceph_cap_string(revoking), | |
1515 | ceph_cap_string(retain), | |
1516 | (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", | |
1517 | (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "", | |
1518 | (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : ""); | |
1519 | ||
1520 | /* | |
1521 | * If we no longer need to hold onto old our caps, and we may | |
1522 | * have cached pages, but don't want them, then try to invalidate. | |
1523 | * If we fail, it's because pages are locked.... try again later. | |
1524 | */ | |
1525 | if ((!is_delayed || mdsc->stopping) && | |
1526 | ci->i_wrbuffer_ref == 0 && /* no dirty pages... */ | |
1527 | inode->i_data.nrpages && /* have cached pages */ | |
1528 | (file_wanted == 0 || /* no open files */ | |
1529 | (revoking & (CEPH_CAP_FILE_CACHE| | |
1530 | CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */ | |
1531 | !tried_invalidate) { | |
1532 | dout("check_caps trying to invalidate on %p\n", inode); | |
1533 | if (try_nonblocking_invalidate(inode) < 0) { | |
1534 | if (revoking & (CEPH_CAP_FILE_CACHE| | |
1535 | CEPH_CAP_FILE_LAZYIO)) { | |
1536 | dout("check_caps queuing invalidate\n"); | |
1537 | queue_invalidate = 1; | |
1538 | ci->i_rdcache_revoking = ci->i_rdcache_gen; | |
1539 | } else { | |
1540 | dout("check_caps failed to invalidate pages\n"); | |
1541 | /* we failed to invalidate pages. check these | |
1542 | caps again later. */ | |
1543 | force_requeue = 1; | |
1544 | __cap_set_timeouts(mdsc, ci); | |
1545 | } | |
1546 | } | |
1547 | tried_invalidate = 1; | |
1548 | goto retry_locked; | |
1549 | } | |
1550 | ||
1551 | num = 0; | |
1552 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
1553 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
1554 | num++; | |
1555 | ||
1556 | /* avoid looping forever */ | |
1557 | if (mds >= cap->mds || | |
1558 | ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) | |
1559 | continue; | |
1560 | ||
1561 | /* NOTE: no side-effects allowed, until we take s_mutex */ | |
1562 | ||
1563 | revoking = cap->implemented & ~cap->issued; | |
1564 | dout(" mds%d cap %p issued %s implemented %s revoking %s\n", | |
1565 | cap->mds, cap, ceph_cap_string(cap->issued), | |
1566 | ceph_cap_string(cap->implemented), | |
1567 | ceph_cap_string(revoking)); | |
1568 | ||
1569 | if (cap == ci->i_auth_cap && | |
1570 | (cap->issued & CEPH_CAP_FILE_WR)) { | |
1571 | /* request larger max_size from MDS? */ | |
1572 | if (ci->i_wanted_max_size > ci->i_max_size && | |
1573 | ci->i_wanted_max_size > ci->i_requested_max_size) { | |
1574 | dout("requesting new max_size\n"); | |
1575 | goto ack; | |
1576 | } | |
1577 | ||
1578 | /* approaching file_max? */ | |
1579 | if ((inode->i_size << 1) >= ci->i_max_size && | |
1580 | (ci->i_reported_size << 1) < ci->i_max_size) { | |
1581 | dout("i_size approaching max_size\n"); | |
1582 | goto ack; | |
1583 | } | |
1584 | } | |
1585 | /* flush anything dirty? */ | |
1586 | if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) && | |
1587 | ci->i_dirty_caps) { | |
1588 | dout("flushing dirty caps\n"); | |
1589 | goto ack; | |
1590 | } | |
1591 | ||
1592 | /* completed revocation? going down and there are no caps? */ | |
1593 | if (revoking && (revoking & used) == 0) { | |
1594 | dout("completed revocation of %s\n", | |
1595 | ceph_cap_string(cap->implemented & ~cap->issued)); | |
1596 | goto ack; | |
1597 | } | |
1598 | ||
1599 | /* want more caps from mds? */ | |
1600 | if (want & ~(cap->mds_wanted | cap->issued)) | |
1601 | goto ack; | |
1602 | ||
1603 | /* things we might delay */ | |
1604 | if ((cap->issued & ~retain) == 0 && | |
1605 | cap->mds_wanted == want) | |
1606 | continue; /* nope, all good */ | |
1607 | ||
1608 | if (is_delayed) | |
1609 | goto ack; | |
1610 | ||
1611 | /* delay? */ | |
1612 | if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && | |
1613 | time_before(jiffies, ci->i_hold_caps_max)) { | |
1614 | dout(" delaying issued %s -> %s, wanted %s -> %s\n", | |
1615 | ceph_cap_string(cap->issued), | |
1616 | ceph_cap_string(cap->issued & retain), | |
1617 | ceph_cap_string(cap->mds_wanted), | |
1618 | ceph_cap_string(want)); | |
1619 | delayed++; | |
1620 | continue; | |
1621 | } | |
1622 | ||
1623 | ack: | |
1624 | if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { | |
1625 | dout(" skipping %p I_NOFLUSH set\n", inode); | |
1626 | continue; | |
1627 | } | |
1628 | ||
1629 | if (session && session != cap->session) { | |
1630 | dout("oops, wrong session %p mutex\n", session); | |
1631 | mutex_unlock(&session->s_mutex); | |
1632 | session = NULL; | |
1633 | } | |
1634 | if (!session) { | |
1635 | session = cap->session; | |
1636 | if (mutex_trylock(&session->s_mutex) == 0) { | |
1637 | dout("inverting session/ino locks on %p\n", | |
1638 | session); | |
1639 | spin_unlock(&inode->i_lock); | |
1640 | if (took_snap_rwsem) { | |
1641 | up_read(&mdsc->snap_rwsem); | |
1642 | took_snap_rwsem = 0; | |
1643 | } | |
1644 | mutex_lock(&session->s_mutex); | |
1645 | goto retry; | |
1646 | } | |
1647 | } | |
1648 | /* take snap_rwsem after session mutex */ | |
1649 | if (!took_snap_rwsem) { | |
1650 | if (down_read_trylock(&mdsc->snap_rwsem) == 0) { | |
1651 | dout("inverting snap/in locks on %p\n", | |
1652 | inode); | |
1653 | spin_unlock(&inode->i_lock); | |
1654 | down_read(&mdsc->snap_rwsem); | |
1655 | took_snap_rwsem = 1; | |
1656 | goto retry; | |
1657 | } | |
1658 | took_snap_rwsem = 1; | |
1659 | } | |
1660 | ||
1661 | if (cap == ci->i_auth_cap && ci->i_dirty_caps) | |
1662 | flushing = __mark_caps_flushing(inode, session); | |
1663 | else | |
1664 | flushing = 0; | |
1665 | ||
1666 | mds = cap->mds; /* remember mds, so we don't repeat */ | |
1667 | sent++; | |
1668 | ||
1669 | /* __send_cap drops i_lock */ | |
1670 | delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want, | |
1671 | retain, flushing, NULL); | |
1672 | goto retry; /* retake i_lock and restart our cap scan. */ | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * Reschedule delayed caps release if we delayed anything, | |
1677 | * otherwise cancel. | |
1678 | */ | |
1679 | if (delayed && is_delayed) | |
1680 | force_requeue = 1; /* __send_cap delayed release; requeue */ | |
1681 | if (!delayed && !is_delayed) | |
1682 | __cap_delay_cancel(mdsc, ci); | |
1683 | else if (!is_delayed || force_requeue) | |
1684 | __cap_delay_requeue(mdsc, ci); | |
1685 | ||
1686 | spin_unlock(&inode->i_lock); | |
1687 | ||
1688 | if (queue_invalidate) | |
1689 | ceph_queue_invalidate(inode); | |
1690 | ||
1691 | if (session) | |
1692 | mutex_unlock(&session->s_mutex); | |
1693 | if (took_snap_rwsem) | |
1694 | up_read(&mdsc->snap_rwsem); | |
1695 | } | |
1696 | ||
1697 | /* | |
1698 | * Try to flush dirty caps back to the auth mds. | |
1699 | */ | |
1700 | static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session, | |
1701 | unsigned *flush_tid) | |
1702 | { | |
1703 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; | |
1704 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1705 | int unlock_session = session ? 0 : 1; | |
1706 | int flushing = 0; | |
1707 | ||
1708 | retry: | |
1709 | spin_lock(&inode->i_lock); | |
1710 | if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { | |
1711 | dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode); | |
1712 | goto out; | |
1713 | } | |
1714 | if (ci->i_dirty_caps && ci->i_auth_cap) { | |
1715 | struct ceph_cap *cap = ci->i_auth_cap; | |
1716 | int used = __ceph_caps_used(ci); | |
1717 | int want = __ceph_caps_wanted(ci); | |
1718 | int delayed; | |
1719 | ||
1720 | if (!session) { | |
1721 | spin_unlock(&inode->i_lock); | |
1722 | session = cap->session; | |
1723 | mutex_lock(&session->s_mutex); | |
1724 | goto retry; | |
1725 | } | |
1726 | BUG_ON(session != cap->session); | |
1727 | if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) | |
1728 | goto out; | |
1729 | ||
1730 | flushing = __mark_caps_flushing(inode, session); | |
1731 | ||
1732 | /* __send_cap drops i_lock */ | |
1733 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want, | |
1734 | cap->issued | cap->implemented, flushing, | |
1735 | flush_tid); | |
1736 | if (!delayed) | |
1737 | goto out_unlocked; | |
1738 | ||
1739 | spin_lock(&inode->i_lock); | |
1740 | __cap_delay_requeue(mdsc, ci); | |
1741 | } | |
1742 | out: | |
1743 | spin_unlock(&inode->i_lock); | |
1744 | out_unlocked: | |
1745 | if (session && unlock_session) | |
1746 | mutex_unlock(&session->s_mutex); | |
1747 | return flushing; | |
1748 | } | |
1749 | ||
1750 | /* | |
1751 | * Return true if we've flushed caps through the given flush_tid. | |
1752 | */ | |
1753 | static int caps_are_flushed(struct inode *inode, unsigned tid) | |
1754 | { | |
1755 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1756 | int i, ret = 1; | |
1757 | ||
1758 | spin_lock(&inode->i_lock); | |
1759 | for (i = 0; i < CEPH_CAP_BITS; i++) | |
1760 | if ((ci->i_flushing_caps & (1 << i)) && | |
1761 | ci->i_cap_flush_tid[i] <= tid) { | |
1762 | /* still flushing this bit */ | |
1763 | ret = 0; | |
1764 | break; | |
1765 | } | |
1766 | spin_unlock(&inode->i_lock); | |
1767 | return ret; | |
1768 | } | |
1769 | ||
1770 | /* | |
1771 | * Wait on any unsafe replies for the given inode. First wait on the | |
1772 | * newest request, and make that the upper bound. Then, if there are | |
1773 | * more requests, keep waiting on the oldest as long as it is still older | |
1774 | * than the original request. | |
1775 | */ | |
1776 | static void sync_write_wait(struct inode *inode) | |
1777 | { | |
1778 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1779 | struct list_head *head = &ci->i_unsafe_writes; | |
1780 | struct ceph_osd_request *req; | |
1781 | u64 last_tid; | |
1782 | ||
1783 | spin_lock(&ci->i_unsafe_lock); | |
1784 | if (list_empty(head)) | |
1785 | goto out; | |
1786 | ||
1787 | /* set upper bound as _last_ entry in chain */ | |
1788 | req = list_entry(head->prev, struct ceph_osd_request, | |
1789 | r_unsafe_item); | |
1790 | last_tid = req->r_tid; | |
1791 | ||
1792 | do { | |
1793 | ceph_osdc_get_request(req); | |
1794 | spin_unlock(&ci->i_unsafe_lock); | |
1795 | dout("sync_write_wait on tid %llu (until %llu)\n", | |
1796 | req->r_tid, last_tid); | |
1797 | wait_for_completion(&req->r_safe_completion); | |
1798 | spin_lock(&ci->i_unsafe_lock); | |
1799 | ceph_osdc_put_request(req); | |
1800 | ||
1801 | /* | |
1802 | * from here on look at first entry in chain, since we | |
1803 | * only want to wait for anything older than last_tid | |
1804 | */ | |
1805 | if (list_empty(head)) | |
1806 | break; | |
1807 | req = list_entry(head->next, struct ceph_osd_request, | |
1808 | r_unsafe_item); | |
1809 | } while (req->r_tid < last_tid); | |
1810 | out: | |
1811 | spin_unlock(&ci->i_unsafe_lock); | |
1812 | } | |
1813 | ||
1814 | int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) | |
1815 | { | |
1816 | struct inode *inode = file->f_mapping->host; | |
1817 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1818 | unsigned flush_tid; | |
1819 | int ret; | |
1820 | int dirty; | |
1821 | ||
1822 | dout("fsync %p%s\n", inode, datasync ? " datasync" : ""); | |
1823 | sync_write_wait(inode); | |
1824 | ||
1825 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
1826 | if (ret < 0) | |
1827 | return ret; | |
1828 | mutex_lock(&inode->i_mutex); | |
1829 | ||
1830 | dirty = try_flush_caps(inode, NULL, &flush_tid); | |
1831 | dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); | |
1832 | ||
1833 | /* | |
1834 | * only wait on non-file metadata writeback (the mds | |
1835 | * can recover size and mtime, so we don't need to | |
1836 | * wait for that) | |
1837 | */ | |
1838 | if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { | |
1839 | dout("fsync waiting for flush_tid %u\n", flush_tid); | |
1840 | ret = wait_event_interruptible(ci->i_cap_wq, | |
1841 | caps_are_flushed(inode, flush_tid)); | |
1842 | } | |
1843 | ||
1844 | dout("fsync %p%s done\n", inode, datasync ? " datasync" : ""); | |
1845 | mutex_unlock(&inode->i_mutex); | |
1846 | return ret; | |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * Flush any dirty caps back to the mds. If we aren't asked to wait, | |
1851 | * queue inode for flush but don't do so immediately, because we can | |
1852 | * get by with fewer MDS messages if we wait for data writeback to | |
1853 | * complete first. | |
1854 | */ | |
1855 | int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) | |
1856 | { | |
1857 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1858 | unsigned flush_tid; | |
1859 | int err = 0; | |
1860 | int dirty; | |
1861 | int wait = wbc->sync_mode == WB_SYNC_ALL; | |
1862 | ||
1863 | dout("write_inode %p wait=%d\n", inode, wait); | |
1864 | if (wait) { | |
1865 | dirty = try_flush_caps(inode, NULL, &flush_tid); | |
1866 | if (dirty) | |
1867 | err = wait_event_interruptible(ci->i_cap_wq, | |
1868 | caps_are_flushed(inode, flush_tid)); | |
1869 | } else { | |
1870 | struct ceph_mds_client *mdsc = | |
1871 | ceph_sb_to_client(inode->i_sb)->mdsc; | |
1872 | ||
1873 | spin_lock(&inode->i_lock); | |
1874 | if (__ceph_caps_dirty(ci)) | |
1875 | __cap_delay_requeue_front(mdsc, ci); | |
1876 | spin_unlock(&inode->i_lock); | |
1877 | } | |
1878 | return err; | |
1879 | } | |
1880 | ||
1881 | /* | |
1882 | * After a recovering MDS goes active, we need to resend any caps | |
1883 | * we were flushing. | |
1884 | * | |
1885 | * Caller holds session->s_mutex. | |
1886 | */ | |
1887 | static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc, | |
1888 | struct ceph_mds_session *session) | |
1889 | { | |
1890 | struct ceph_cap_snap *capsnap; | |
1891 | ||
1892 | dout("kick_flushing_capsnaps mds%d\n", session->s_mds); | |
1893 | list_for_each_entry(capsnap, &session->s_cap_snaps_flushing, | |
1894 | flushing_item) { | |
1895 | struct ceph_inode_info *ci = capsnap->ci; | |
1896 | struct inode *inode = &ci->vfs_inode; | |
1897 | struct ceph_cap *cap; | |
1898 | ||
1899 | spin_lock(&inode->i_lock); | |
1900 | cap = ci->i_auth_cap; | |
1901 | if (cap && cap->session == session) { | |
1902 | dout("kick_flushing_caps %p cap %p capsnap %p\n", inode, | |
1903 | cap, capsnap); | |
1904 | __ceph_flush_snaps(ci, &session, 1); | |
1905 | } else { | |
1906 | pr_err("%p auth cap %p not mds%d ???\n", inode, | |
1907 | cap, session->s_mds); | |
1908 | } | |
1909 | spin_unlock(&inode->i_lock); | |
1910 | } | |
1911 | } | |
1912 | ||
1913 | void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, | |
1914 | struct ceph_mds_session *session) | |
1915 | { | |
1916 | struct ceph_inode_info *ci; | |
1917 | ||
1918 | kick_flushing_capsnaps(mdsc, session); | |
1919 | ||
1920 | dout("kick_flushing_caps mds%d\n", session->s_mds); | |
1921 | list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { | |
1922 | struct inode *inode = &ci->vfs_inode; | |
1923 | struct ceph_cap *cap; | |
1924 | int delayed = 0; | |
1925 | ||
1926 | spin_lock(&inode->i_lock); | |
1927 | cap = ci->i_auth_cap; | |
1928 | if (cap && cap->session == session) { | |
1929 | dout("kick_flushing_caps %p cap %p %s\n", inode, | |
1930 | cap, ceph_cap_string(ci->i_flushing_caps)); | |
1931 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, | |
1932 | __ceph_caps_used(ci), | |
1933 | __ceph_caps_wanted(ci), | |
1934 | cap->issued | cap->implemented, | |
1935 | ci->i_flushing_caps, NULL); | |
1936 | if (delayed) { | |
1937 | spin_lock(&inode->i_lock); | |
1938 | __cap_delay_requeue(mdsc, ci); | |
1939 | spin_unlock(&inode->i_lock); | |
1940 | } | |
1941 | } else { | |
1942 | pr_err("%p auth cap %p not mds%d ???\n", inode, | |
1943 | cap, session->s_mds); | |
1944 | spin_unlock(&inode->i_lock); | |
1945 | } | |
1946 | } | |
1947 | } | |
1948 | ||
1949 | static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc, | |
1950 | struct ceph_mds_session *session, | |
1951 | struct inode *inode) | |
1952 | { | |
1953 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1954 | struct ceph_cap *cap; | |
1955 | int delayed = 0; | |
1956 | ||
1957 | spin_lock(&inode->i_lock); | |
1958 | cap = ci->i_auth_cap; | |
1959 | dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode, | |
1960 | ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq); | |
1961 | __ceph_flush_snaps(ci, &session, 1); | |
1962 | if (ci->i_flushing_caps) { | |
1963 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, | |
1964 | __ceph_caps_used(ci), | |
1965 | __ceph_caps_wanted(ci), | |
1966 | cap->issued | cap->implemented, | |
1967 | ci->i_flushing_caps, NULL); | |
1968 | if (delayed) { | |
1969 | spin_lock(&inode->i_lock); | |
1970 | __cap_delay_requeue(mdsc, ci); | |
1971 | spin_unlock(&inode->i_lock); | |
1972 | } | |
1973 | } else { | |
1974 | spin_unlock(&inode->i_lock); | |
1975 | } | |
1976 | } | |
1977 | ||
1978 | ||
1979 | /* | |
1980 | * Take references to capabilities we hold, so that we don't release | |
1981 | * them to the MDS prematurely. | |
1982 | * | |
1983 | * Protected by i_lock. | |
1984 | */ | |
1985 | static void __take_cap_refs(struct ceph_inode_info *ci, int got) | |
1986 | { | |
1987 | if (got & CEPH_CAP_PIN) | |
1988 | ci->i_pin_ref++; | |
1989 | if (got & CEPH_CAP_FILE_RD) | |
1990 | ci->i_rd_ref++; | |
1991 | if (got & CEPH_CAP_FILE_CACHE) | |
1992 | ci->i_rdcache_ref++; | |
1993 | if (got & CEPH_CAP_FILE_WR) | |
1994 | ci->i_wr_ref++; | |
1995 | if (got & CEPH_CAP_FILE_BUFFER) { | |
1996 | if (ci->i_wb_ref == 0) | |
1997 | ihold(&ci->vfs_inode); | |
1998 | ci->i_wb_ref++; | |
1999 | dout("__take_cap_refs %p wb %d -> %d (?)\n", | |
2000 | &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref); | |
2001 | } | |
2002 | } | |
2003 | ||
2004 | /* | |
2005 | * Try to grab cap references. Specify those refs we @want, and the | |
2006 | * minimal set we @need. Also include the larger offset we are writing | |
2007 | * to (when applicable), and check against max_size here as well. | |
2008 | * Note that caller is responsible for ensuring max_size increases are | |
2009 | * requested from the MDS. | |
2010 | */ | |
2011 | static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want, | |
2012 | int *got, loff_t endoff, int *check_max, int *err) | |
2013 | { | |
2014 | struct inode *inode = &ci->vfs_inode; | |
2015 | int ret = 0; | |
2016 | int have, implemented; | |
2017 | int file_wanted; | |
2018 | ||
2019 | dout("get_cap_refs %p need %s want %s\n", inode, | |
2020 | ceph_cap_string(need), ceph_cap_string(want)); | |
2021 | spin_lock(&inode->i_lock); | |
2022 | ||
2023 | /* make sure file is actually open */ | |
2024 | file_wanted = __ceph_caps_file_wanted(ci); | |
2025 | if ((file_wanted & need) == 0) { | |
2026 | dout("try_get_cap_refs need %s file_wanted %s, EBADF\n", | |
2027 | ceph_cap_string(need), ceph_cap_string(file_wanted)); | |
2028 | *err = -EBADF; | |
2029 | ret = 1; | |
2030 | goto out; | |
2031 | } | |
2032 | ||
2033 | if (need & CEPH_CAP_FILE_WR) { | |
2034 | if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { | |
2035 | dout("get_cap_refs %p endoff %llu > maxsize %llu\n", | |
2036 | inode, endoff, ci->i_max_size); | |
2037 | if (endoff > ci->i_wanted_max_size) { | |
2038 | *check_max = 1; | |
2039 | ret = 1; | |
2040 | } | |
2041 | goto out; | |
2042 | } | |
2043 | /* | |
2044 | * If a sync write is in progress, we must wait, so that we | |
2045 | * can get a final snapshot value for size+mtime. | |
2046 | */ | |
2047 | if (__ceph_have_pending_cap_snap(ci)) { | |
2048 | dout("get_cap_refs %p cap_snap_pending\n", inode); | |
2049 | goto out; | |
2050 | } | |
2051 | } | |
2052 | have = __ceph_caps_issued(ci, &implemented); | |
2053 | ||
2054 | /* | |
2055 | * disallow writes while a truncate is pending | |
2056 | */ | |
2057 | if (ci->i_truncate_pending) | |
2058 | have &= ~CEPH_CAP_FILE_WR; | |
2059 | ||
2060 | if ((have & need) == need) { | |
2061 | /* | |
2062 | * Look at (implemented & ~have & not) so that we keep waiting | |
2063 | * on transition from wanted -> needed caps. This is needed | |
2064 | * for WRBUFFER|WR -> WR to avoid a new WR sync write from | |
2065 | * going before a prior buffered writeback happens. | |
2066 | */ | |
2067 | int not = want & ~(have & need); | |
2068 | int revoking = implemented & ~have; | |
2069 | dout("get_cap_refs %p have %s but not %s (revoking %s)\n", | |
2070 | inode, ceph_cap_string(have), ceph_cap_string(not), | |
2071 | ceph_cap_string(revoking)); | |
2072 | if ((revoking & not) == 0) { | |
2073 | *got = need | (have & want); | |
2074 | __take_cap_refs(ci, *got); | |
2075 | ret = 1; | |
2076 | } | |
2077 | } else { | |
2078 | dout("get_cap_refs %p have %s needed %s\n", inode, | |
2079 | ceph_cap_string(have), ceph_cap_string(need)); | |
2080 | } | |
2081 | out: | |
2082 | spin_unlock(&inode->i_lock); | |
2083 | dout("get_cap_refs %p ret %d got %s\n", inode, | |
2084 | ret, ceph_cap_string(*got)); | |
2085 | return ret; | |
2086 | } | |
2087 | ||
2088 | /* | |
2089 | * Check the offset we are writing up to against our current | |
2090 | * max_size. If necessary, tell the MDS we want to write to | |
2091 | * a larger offset. | |
2092 | */ | |
2093 | static void check_max_size(struct inode *inode, loff_t endoff) | |
2094 | { | |
2095 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2096 | int check = 0; | |
2097 | ||
2098 | /* do we need to explicitly request a larger max_size? */ | |
2099 | spin_lock(&inode->i_lock); | |
2100 | if ((endoff >= ci->i_max_size || | |
2101 | endoff > (inode->i_size << 1)) && | |
2102 | endoff > ci->i_wanted_max_size) { | |
2103 | dout("write %p at large endoff %llu, req max_size\n", | |
2104 | inode, endoff); | |
2105 | ci->i_wanted_max_size = endoff; | |
2106 | check = 1; | |
2107 | } | |
2108 | spin_unlock(&inode->i_lock); | |
2109 | if (check) | |
2110 | ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * Wait for caps, and take cap references. If we can't get a WR cap | |
2115 | * due to a small max_size, make sure we check_max_size (and possibly | |
2116 | * ask the mds) so we don't get hung up indefinitely. | |
2117 | */ | |
2118 | int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got, | |
2119 | loff_t endoff) | |
2120 | { | |
2121 | int check_max, ret, err; | |
2122 | ||
2123 | retry: | |
2124 | if (endoff > 0) | |
2125 | check_max_size(&ci->vfs_inode, endoff); | |
2126 | check_max = 0; | |
2127 | err = 0; | |
2128 | ret = wait_event_interruptible(ci->i_cap_wq, | |
2129 | try_get_cap_refs(ci, need, want, | |
2130 | got, endoff, | |
2131 | &check_max, &err)); | |
2132 | if (err) | |
2133 | ret = err; | |
2134 | if (check_max) | |
2135 | goto retry; | |
2136 | return ret; | |
2137 | } | |
2138 | ||
2139 | /* | |
2140 | * Take cap refs. Caller must already know we hold at least one ref | |
2141 | * on the caps in question or we don't know this is safe. | |
2142 | */ | |
2143 | void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) | |
2144 | { | |
2145 | spin_lock(&ci->vfs_inode.i_lock); | |
2146 | __take_cap_refs(ci, caps); | |
2147 | spin_unlock(&ci->vfs_inode.i_lock); | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Release cap refs. | |
2152 | * | |
2153 | * If we released the last ref on any given cap, call ceph_check_caps | |
2154 | * to release (or schedule a release). | |
2155 | * | |
2156 | * If we are releasing a WR cap (from a sync write), finalize any affected | |
2157 | * cap_snap, and wake up any waiters. | |
2158 | */ | |
2159 | void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) | |
2160 | { | |
2161 | struct inode *inode = &ci->vfs_inode; | |
2162 | int last = 0, put = 0, flushsnaps = 0, wake = 0; | |
2163 | struct ceph_cap_snap *capsnap; | |
2164 | ||
2165 | spin_lock(&inode->i_lock); | |
2166 | if (had & CEPH_CAP_PIN) | |
2167 | --ci->i_pin_ref; | |
2168 | if (had & CEPH_CAP_FILE_RD) | |
2169 | if (--ci->i_rd_ref == 0) | |
2170 | last++; | |
2171 | if (had & CEPH_CAP_FILE_CACHE) | |
2172 | if (--ci->i_rdcache_ref == 0) | |
2173 | last++; | |
2174 | if (had & CEPH_CAP_FILE_BUFFER) { | |
2175 | if (--ci->i_wb_ref == 0) { | |
2176 | last++; | |
2177 | put++; | |
2178 | } | |
2179 | dout("put_cap_refs %p wb %d -> %d (?)\n", | |
2180 | inode, ci->i_wb_ref+1, ci->i_wb_ref); | |
2181 | } | |
2182 | if (had & CEPH_CAP_FILE_WR) | |
2183 | if (--ci->i_wr_ref == 0) { | |
2184 | last++; | |
2185 | if (!list_empty(&ci->i_cap_snaps)) { | |
2186 | capsnap = list_first_entry(&ci->i_cap_snaps, | |
2187 | struct ceph_cap_snap, | |
2188 | ci_item); | |
2189 | if (capsnap->writing) { | |
2190 | capsnap->writing = 0; | |
2191 | flushsnaps = | |
2192 | __ceph_finish_cap_snap(ci, | |
2193 | capsnap); | |
2194 | wake = 1; | |
2195 | } | |
2196 | } | |
2197 | } | |
2198 | spin_unlock(&inode->i_lock); | |
2199 | ||
2200 | dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had), | |
2201 | last ? " last" : "", put ? " put" : ""); | |
2202 | ||
2203 | if (last && !flushsnaps) | |
2204 | ceph_check_caps(ci, 0, NULL); | |
2205 | else if (flushsnaps) | |
2206 | ceph_flush_snaps(ci); | |
2207 | if (wake) | |
2208 | wake_up_all(&ci->i_cap_wq); | |
2209 | if (put) | |
2210 | iput(inode); | |
2211 | } | |
2212 | ||
2213 | /* | |
2214 | * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap | |
2215 | * context. Adjust per-snap dirty page accounting as appropriate. | |
2216 | * Once all dirty data for a cap_snap is flushed, flush snapped file | |
2217 | * metadata back to the MDS. If we dropped the last ref, call | |
2218 | * ceph_check_caps. | |
2219 | */ | |
2220 | void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, | |
2221 | struct ceph_snap_context *snapc) | |
2222 | { | |
2223 | struct inode *inode = &ci->vfs_inode; | |
2224 | int last = 0; | |
2225 | int complete_capsnap = 0; | |
2226 | int drop_capsnap = 0; | |
2227 | int found = 0; | |
2228 | struct ceph_cap_snap *capsnap = NULL; | |
2229 | ||
2230 | spin_lock(&inode->i_lock); | |
2231 | ci->i_wrbuffer_ref -= nr; | |
2232 | last = !ci->i_wrbuffer_ref; | |
2233 | ||
2234 | if (ci->i_head_snapc == snapc) { | |
2235 | ci->i_wrbuffer_ref_head -= nr; | |
2236 | if (ci->i_wrbuffer_ref_head == 0 && | |
2237 | ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) { | |
2238 | BUG_ON(!ci->i_head_snapc); | |
2239 | ceph_put_snap_context(ci->i_head_snapc); | |
2240 | ci->i_head_snapc = NULL; | |
2241 | } | |
2242 | dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n", | |
2243 | inode, | |
2244 | ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr, | |
2245 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
2246 | last ? " LAST" : ""); | |
2247 | } else { | |
2248 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
2249 | if (capsnap->context == snapc) { | |
2250 | found = 1; | |
2251 | break; | |
2252 | } | |
2253 | } | |
2254 | BUG_ON(!found); | |
2255 | capsnap->dirty_pages -= nr; | |
2256 | if (capsnap->dirty_pages == 0) { | |
2257 | complete_capsnap = 1; | |
2258 | if (capsnap->dirty == 0) | |
2259 | /* cap writeback completed before we created | |
2260 | * the cap_snap; no FLUSHSNAP is needed */ | |
2261 | drop_capsnap = 1; | |
2262 | } | |
2263 | dout("put_wrbuffer_cap_refs on %p cap_snap %p " | |
2264 | " snap %lld %d/%d -> %d/%d %s%s%s\n", | |
2265 | inode, capsnap, capsnap->context->seq, | |
2266 | ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, | |
2267 | ci->i_wrbuffer_ref, capsnap->dirty_pages, | |
2268 | last ? " (wrbuffer last)" : "", | |
2269 | complete_capsnap ? " (complete capsnap)" : "", | |
2270 | drop_capsnap ? " (drop capsnap)" : ""); | |
2271 | if (drop_capsnap) { | |
2272 | ceph_put_snap_context(capsnap->context); | |
2273 | list_del(&capsnap->ci_item); | |
2274 | list_del(&capsnap->flushing_item); | |
2275 | ceph_put_cap_snap(capsnap); | |
2276 | } | |
2277 | } | |
2278 | ||
2279 | spin_unlock(&inode->i_lock); | |
2280 | ||
2281 | if (last) { | |
2282 | ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); | |
2283 | iput(inode); | |
2284 | } else if (complete_capsnap) { | |
2285 | ceph_flush_snaps(ci); | |
2286 | wake_up_all(&ci->i_cap_wq); | |
2287 | } | |
2288 | if (drop_capsnap) | |
2289 | iput(inode); | |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Handle a cap GRANT message from the MDS. (Note that a GRANT may | |
2294 | * actually be a revocation if it specifies a smaller cap set.) | |
2295 | * | |
2296 | * caller holds s_mutex and i_lock, we drop both. | |
2297 | * | |
2298 | * return value: | |
2299 | * 0 - ok | |
2300 | * 1 - check_caps on auth cap only (writeback) | |
2301 | * 2 - check_caps (ack revoke) | |
2302 | */ | |
2303 | static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, | |
2304 | struct ceph_mds_session *session, | |
2305 | struct ceph_cap *cap, | |
2306 | struct ceph_buffer *xattr_buf) | |
2307 | __releases(inode->i_lock) | |
2308 | { | |
2309 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2310 | int mds = session->s_mds; | |
2311 | int seq = le32_to_cpu(grant->seq); | |
2312 | int newcaps = le32_to_cpu(grant->caps); | |
2313 | int issued, implemented, used, wanted, dirty; | |
2314 | u64 size = le64_to_cpu(grant->size); | |
2315 | u64 max_size = le64_to_cpu(grant->max_size); | |
2316 | struct timespec mtime, atime, ctime; | |
2317 | int check_caps = 0; | |
2318 | int wake = 0; | |
2319 | int writeback = 0; | |
2320 | int revoked_rdcache = 0; | |
2321 | int queue_invalidate = 0; | |
2322 | ||
2323 | dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", | |
2324 | inode, cap, mds, seq, ceph_cap_string(newcaps)); | |
2325 | dout(" size %llu max_size %llu, i_size %llu\n", size, max_size, | |
2326 | inode->i_size); | |
2327 | ||
2328 | /* | |
2329 | * If CACHE is being revoked, and we have no dirty buffers, | |
2330 | * try to invalidate (once). (If there are dirty buffers, we | |
2331 | * will invalidate _after_ writeback.) | |
2332 | */ | |
2333 | if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && | |
2334 | (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && | |
2335 | !ci->i_wrbuffer_ref) { | |
2336 | if (try_nonblocking_invalidate(inode) == 0) { | |
2337 | revoked_rdcache = 1; | |
2338 | } else { | |
2339 | /* there were locked pages.. invalidate later | |
2340 | in a separate thread. */ | |
2341 | if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { | |
2342 | queue_invalidate = 1; | |
2343 | ci->i_rdcache_revoking = ci->i_rdcache_gen; | |
2344 | } | |
2345 | } | |
2346 | } | |
2347 | ||
2348 | /* side effects now are allowed */ | |
2349 | ||
2350 | issued = __ceph_caps_issued(ci, &implemented); | |
2351 | issued |= implemented | __ceph_caps_dirty(ci); | |
2352 | ||
2353 | cap->cap_gen = session->s_cap_gen; | |
2354 | ||
2355 | __check_cap_issue(ci, cap, newcaps); | |
2356 | ||
2357 | if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { | |
2358 | inode->i_mode = le32_to_cpu(grant->mode); | |
2359 | inode->i_uid = le32_to_cpu(grant->uid); | |
2360 | inode->i_gid = le32_to_cpu(grant->gid); | |
2361 | dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, | |
2362 | inode->i_uid, inode->i_gid); | |
2363 | } | |
2364 | ||
2365 | if ((issued & CEPH_CAP_LINK_EXCL) == 0) | |
2366 | inode->i_nlink = le32_to_cpu(grant->nlink); | |
2367 | ||
2368 | if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) { | |
2369 | int len = le32_to_cpu(grant->xattr_len); | |
2370 | u64 version = le64_to_cpu(grant->xattr_version); | |
2371 | ||
2372 | if (version > ci->i_xattrs.version) { | |
2373 | dout(" got new xattrs v%llu on %p len %d\n", | |
2374 | version, inode, len); | |
2375 | if (ci->i_xattrs.blob) | |
2376 | ceph_buffer_put(ci->i_xattrs.blob); | |
2377 | ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); | |
2378 | ci->i_xattrs.version = version; | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | /* size/ctime/mtime/atime? */ | |
2383 | ceph_fill_file_size(inode, issued, | |
2384 | le32_to_cpu(grant->truncate_seq), | |
2385 | le64_to_cpu(grant->truncate_size), size); | |
2386 | ceph_decode_timespec(&mtime, &grant->mtime); | |
2387 | ceph_decode_timespec(&atime, &grant->atime); | |
2388 | ceph_decode_timespec(&ctime, &grant->ctime); | |
2389 | ceph_fill_file_time(inode, issued, | |
2390 | le32_to_cpu(grant->time_warp_seq), &ctime, &mtime, | |
2391 | &atime); | |
2392 | ||
2393 | /* max size increase? */ | |
2394 | if (max_size != ci->i_max_size) { | |
2395 | dout("max_size %lld -> %llu\n", ci->i_max_size, max_size); | |
2396 | ci->i_max_size = max_size; | |
2397 | if (max_size >= ci->i_wanted_max_size) { | |
2398 | ci->i_wanted_max_size = 0; /* reset */ | |
2399 | ci->i_requested_max_size = 0; | |
2400 | } | |
2401 | wake = 1; | |
2402 | } | |
2403 | ||
2404 | /* check cap bits */ | |
2405 | wanted = __ceph_caps_wanted(ci); | |
2406 | used = __ceph_caps_used(ci); | |
2407 | dirty = __ceph_caps_dirty(ci); | |
2408 | dout(" my wanted = %s, used = %s, dirty %s\n", | |
2409 | ceph_cap_string(wanted), | |
2410 | ceph_cap_string(used), | |
2411 | ceph_cap_string(dirty)); | |
2412 | if (wanted != le32_to_cpu(grant->wanted)) { | |
2413 | dout("mds wanted %s -> %s\n", | |
2414 | ceph_cap_string(le32_to_cpu(grant->wanted)), | |
2415 | ceph_cap_string(wanted)); | |
2416 | grant->wanted = cpu_to_le32(wanted); | |
2417 | } | |
2418 | ||
2419 | cap->seq = seq; | |
2420 | ||
2421 | /* file layout may have changed */ | |
2422 | ci->i_layout = grant->layout; | |
2423 | ||
2424 | /* revocation, grant, or no-op? */ | |
2425 | if (cap->issued & ~newcaps) { | |
2426 | int revoking = cap->issued & ~newcaps; | |
2427 | ||
2428 | dout("revocation: %s -> %s (revoking %s)\n", | |
2429 | ceph_cap_string(cap->issued), | |
2430 | ceph_cap_string(newcaps), | |
2431 | ceph_cap_string(revoking)); | |
2432 | if (revoking & used & CEPH_CAP_FILE_BUFFER) | |
2433 | writeback = 1; /* initiate writeback; will delay ack */ | |
2434 | else if (revoking == CEPH_CAP_FILE_CACHE && | |
2435 | (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && | |
2436 | queue_invalidate) | |
2437 | ; /* do nothing yet, invalidation will be queued */ | |
2438 | else if (cap == ci->i_auth_cap) | |
2439 | check_caps = 1; /* check auth cap only */ | |
2440 | else | |
2441 | check_caps = 2; /* check all caps */ | |
2442 | cap->issued = newcaps; | |
2443 | cap->implemented |= newcaps; | |
2444 | } else if (cap->issued == newcaps) { | |
2445 | dout("caps unchanged: %s -> %s\n", | |
2446 | ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); | |
2447 | } else { | |
2448 | dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), | |
2449 | ceph_cap_string(newcaps)); | |
2450 | cap->issued = newcaps; | |
2451 | cap->implemented |= newcaps; /* add bits only, to | |
2452 | * avoid stepping on a | |
2453 | * pending revocation */ | |
2454 | wake = 1; | |
2455 | } | |
2456 | BUG_ON(cap->issued & ~cap->implemented); | |
2457 | ||
2458 | spin_unlock(&inode->i_lock); | |
2459 | if (writeback) | |
2460 | /* | |
2461 | * queue inode for writeback: we can't actually call | |
2462 | * filemap_write_and_wait, etc. from message handler | |
2463 | * context. | |
2464 | */ | |
2465 | ceph_queue_writeback(inode); | |
2466 | if (queue_invalidate) | |
2467 | ceph_queue_invalidate(inode); | |
2468 | if (wake) | |
2469 | wake_up_all(&ci->i_cap_wq); | |
2470 | ||
2471 | if (check_caps == 1) | |
2472 | ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY, | |
2473 | session); | |
2474 | else if (check_caps == 2) | |
2475 | ceph_check_caps(ci, CHECK_CAPS_NODELAY, session); | |
2476 | else | |
2477 | mutex_unlock(&session->s_mutex); | |
2478 | } | |
2479 | ||
2480 | /* | |
2481 | * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the | |
2482 | * MDS has been safely committed. | |
2483 | */ | |
2484 | static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, | |
2485 | struct ceph_mds_caps *m, | |
2486 | struct ceph_mds_session *session, | |
2487 | struct ceph_cap *cap) | |
2488 | __releases(inode->i_lock) | |
2489 | { | |
2490 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2491 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; | |
2492 | unsigned seq = le32_to_cpu(m->seq); | |
2493 | int dirty = le32_to_cpu(m->dirty); | |
2494 | int cleaned = 0; | |
2495 | int drop = 0; | |
2496 | int i; | |
2497 | ||
2498 | for (i = 0; i < CEPH_CAP_BITS; i++) | |
2499 | if ((dirty & (1 << i)) && | |
2500 | flush_tid == ci->i_cap_flush_tid[i]) | |
2501 | cleaned |= 1 << i; | |
2502 | ||
2503 | dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s," | |
2504 | " flushing %s -> %s\n", | |
2505 | inode, session->s_mds, seq, ceph_cap_string(dirty), | |
2506 | ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps), | |
2507 | ceph_cap_string(ci->i_flushing_caps & ~cleaned)); | |
2508 | ||
2509 | if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned)) | |
2510 | goto out; | |
2511 | ||
2512 | ci->i_flushing_caps &= ~cleaned; | |
2513 | ||
2514 | spin_lock(&mdsc->cap_dirty_lock); | |
2515 | if (ci->i_flushing_caps == 0) { | |
2516 | list_del_init(&ci->i_flushing_item); | |
2517 | if (!list_empty(&session->s_cap_flushing)) | |
2518 | dout(" mds%d still flushing cap on %p\n", | |
2519 | session->s_mds, | |
2520 | &list_entry(session->s_cap_flushing.next, | |
2521 | struct ceph_inode_info, | |
2522 | i_flushing_item)->vfs_inode); | |
2523 | mdsc->num_cap_flushing--; | |
2524 | wake_up_all(&mdsc->cap_flushing_wq); | |
2525 | dout(" inode %p now !flushing\n", inode); | |
2526 | ||
2527 | if (ci->i_dirty_caps == 0) { | |
2528 | dout(" inode %p now clean\n", inode); | |
2529 | BUG_ON(!list_empty(&ci->i_dirty_item)); | |
2530 | drop = 1; | |
2531 | if (ci->i_wrbuffer_ref_head == 0) { | |
2532 | BUG_ON(!ci->i_head_snapc); | |
2533 | ceph_put_snap_context(ci->i_head_snapc); | |
2534 | ci->i_head_snapc = NULL; | |
2535 | } | |
2536 | } else { | |
2537 | BUG_ON(list_empty(&ci->i_dirty_item)); | |
2538 | } | |
2539 | } | |
2540 | spin_unlock(&mdsc->cap_dirty_lock); | |
2541 | wake_up_all(&ci->i_cap_wq); | |
2542 | ||
2543 | out: | |
2544 | spin_unlock(&inode->i_lock); | |
2545 | if (drop) | |
2546 | iput(inode); | |
2547 | } | |
2548 | ||
2549 | /* | |
2550 | * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can | |
2551 | * throw away our cap_snap. | |
2552 | * | |
2553 | * Caller hold s_mutex. | |
2554 | */ | |
2555 | static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, | |
2556 | struct ceph_mds_caps *m, | |
2557 | struct ceph_mds_session *session) | |
2558 | { | |
2559 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2560 | u64 follows = le64_to_cpu(m->snap_follows); | |
2561 | struct ceph_cap_snap *capsnap; | |
2562 | int drop = 0; | |
2563 | ||
2564 | dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n", | |
2565 | inode, ci, session->s_mds, follows); | |
2566 | ||
2567 | spin_lock(&inode->i_lock); | |
2568 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
2569 | if (capsnap->follows == follows) { | |
2570 | if (capsnap->flush_tid != flush_tid) { | |
2571 | dout(" cap_snap %p follows %lld tid %lld !=" | |
2572 | " %lld\n", capsnap, follows, | |
2573 | flush_tid, capsnap->flush_tid); | |
2574 | break; | |
2575 | } | |
2576 | WARN_ON(capsnap->dirty_pages || capsnap->writing); | |
2577 | dout(" removing %p cap_snap %p follows %lld\n", | |
2578 | inode, capsnap, follows); | |
2579 | ceph_put_snap_context(capsnap->context); | |
2580 | list_del(&capsnap->ci_item); | |
2581 | list_del(&capsnap->flushing_item); | |
2582 | ceph_put_cap_snap(capsnap); | |
2583 | drop = 1; | |
2584 | break; | |
2585 | } else { | |
2586 | dout(" skipping cap_snap %p follows %lld\n", | |
2587 | capsnap, capsnap->follows); | |
2588 | } | |
2589 | } | |
2590 | spin_unlock(&inode->i_lock); | |
2591 | if (drop) | |
2592 | iput(inode); | |
2593 | } | |
2594 | ||
2595 | /* | |
2596 | * Handle TRUNC from MDS, indicating file truncation. | |
2597 | * | |
2598 | * caller hold s_mutex. | |
2599 | */ | |
2600 | static void handle_cap_trunc(struct inode *inode, | |
2601 | struct ceph_mds_caps *trunc, | |
2602 | struct ceph_mds_session *session) | |
2603 | __releases(inode->i_lock) | |
2604 | { | |
2605 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2606 | int mds = session->s_mds; | |
2607 | int seq = le32_to_cpu(trunc->seq); | |
2608 | u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); | |
2609 | u64 truncate_size = le64_to_cpu(trunc->truncate_size); | |
2610 | u64 size = le64_to_cpu(trunc->size); | |
2611 | int implemented = 0; | |
2612 | int dirty = __ceph_caps_dirty(ci); | |
2613 | int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); | |
2614 | int queue_trunc = 0; | |
2615 | ||
2616 | issued |= implemented | dirty; | |
2617 | ||
2618 | dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n", | |
2619 | inode, mds, seq, truncate_size, truncate_seq); | |
2620 | queue_trunc = ceph_fill_file_size(inode, issued, | |
2621 | truncate_seq, truncate_size, size); | |
2622 | spin_unlock(&inode->i_lock); | |
2623 | ||
2624 | if (queue_trunc) | |
2625 | ceph_queue_vmtruncate(inode); | |
2626 | } | |
2627 | ||
2628 | /* | |
2629 | * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a | |
2630 | * different one. If we are the most recent migration we've seen (as | |
2631 | * indicated by mseq), make note of the migrating cap bits for the | |
2632 | * duration (until we see the corresponding IMPORT). | |
2633 | * | |
2634 | * caller holds s_mutex | |
2635 | */ | |
2636 | static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, | |
2637 | struct ceph_mds_session *session, | |
2638 | int *open_target_sessions) | |
2639 | { | |
2640 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; | |
2641 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2642 | int mds = session->s_mds; | |
2643 | unsigned mseq = le32_to_cpu(ex->migrate_seq); | |
2644 | struct ceph_cap *cap = NULL, *t; | |
2645 | struct rb_node *p; | |
2646 | int remember = 1; | |
2647 | ||
2648 | dout("handle_cap_export inode %p ci %p mds%d mseq %d\n", | |
2649 | inode, ci, mds, mseq); | |
2650 | ||
2651 | spin_lock(&inode->i_lock); | |
2652 | ||
2653 | /* make sure we haven't seen a higher mseq */ | |
2654 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
2655 | t = rb_entry(p, struct ceph_cap, ci_node); | |
2656 | if (ceph_seq_cmp(t->mseq, mseq) > 0) { | |
2657 | dout(" higher mseq on cap from mds%d\n", | |
2658 | t->session->s_mds); | |
2659 | remember = 0; | |
2660 | } | |
2661 | if (t->session->s_mds == mds) | |
2662 | cap = t; | |
2663 | } | |
2664 | ||
2665 | if (cap) { | |
2666 | if (remember) { | |
2667 | /* make note */ | |
2668 | ci->i_cap_exporting_mds = mds; | |
2669 | ci->i_cap_exporting_mseq = mseq; | |
2670 | ci->i_cap_exporting_issued = cap->issued; | |
2671 | ||
2672 | /* | |
2673 | * make sure we have open sessions with all possible | |
2674 | * export targets, so that we get the matching IMPORT | |
2675 | */ | |
2676 | *open_target_sessions = 1; | |
2677 | ||
2678 | /* | |
2679 | * we can't flush dirty caps that we've seen the | |
2680 | * EXPORT but no IMPORT for | |
2681 | */ | |
2682 | spin_lock(&mdsc->cap_dirty_lock); | |
2683 | if (!list_empty(&ci->i_dirty_item)) { | |
2684 | dout(" moving %p to cap_dirty_migrating\n", | |
2685 | inode); | |
2686 | list_move(&ci->i_dirty_item, | |
2687 | &mdsc->cap_dirty_migrating); | |
2688 | } | |
2689 | spin_unlock(&mdsc->cap_dirty_lock); | |
2690 | } | |
2691 | __ceph_remove_cap(cap); | |
2692 | } | |
2693 | /* else, we already released it */ | |
2694 | ||
2695 | spin_unlock(&inode->i_lock); | |
2696 | } | |
2697 | ||
2698 | /* | |
2699 | * Handle cap IMPORT. If there are temp bits from an older EXPORT, | |
2700 | * clean them up. | |
2701 | * | |
2702 | * caller holds s_mutex. | |
2703 | */ | |
2704 | static void handle_cap_import(struct ceph_mds_client *mdsc, | |
2705 | struct inode *inode, struct ceph_mds_caps *im, | |
2706 | struct ceph_mds_session *session, | |
2707 | void *snaptrace, int snaptrace_len) | |
2708 | { | |
2709 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2710 | int mds = session->s_mds; | |
2711 | unsigned issued = le32_to_cpu(im->caps); | |
2712 | unsigned wanted = le32_to_cpu(im->wanted); | |
2713 | unsigned seq = le32_to_cpu(im->seq); | |
2714 | unsigned mseq = le32_to_cpu(im->migrate_seq); | |
2715 | u64 realmino = le64_to_cpu(im->realm); | |
2716 | u64 cap_id = le64_to_cpu(im->cap_id); | |
2717 | ||
2718 | if (ci->i_cap_exporting_mds >= 0 && | |
2719 | ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) { | |
2720 | dout("handle_cap_import inode %p ci %p mds%d mseq %d" | |
2721 | " - cleared exporting from mds%d\n", | |
2722 | inode, ci, mds, mseq, | |
2723 | ci->i_cap_exporting_mds); | |
2724 | ci->i_cap_exporting_issued = 0; | |
2725 | ci->i_cap_exporting_mseq = 0; | |
2726 | ci->i_cap_exporting_mds = -1; | |
2727 | ||
2728 | spin_lock(&mdsc->cap_dirty_lock); | |
2729 | if (!list_empty(&ci->i_dirty_item)) { | |
2730 | dout(" moving %p back to cap_dirty\n", inode); | |
2731 | list_move(&ci->i_dirty_item, &mdsc->cap_dirty); | |
2732 | } | |
2733 | spin_unlock(&mdsc->cap_dirty_lock); | |
2734 | } else { | |
2735 | dout("handle_cap_import inode %p ci %p mds%d mseq %d\n", | |
2736 | inode, ci, mds, mseq); | |
2737 | } | |
2738 | ||
2739 | down_write(&mdsc->snap_rwsem); | |
2740 | ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len, | |
2741 | false); | |
2742 | downgrade_write(&mdsc->snap_rwsem); | |
2743 | ceph_add_cap(inode, session, cap_id, -1, | |
2744 | issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH, | |
2745 | NULL /* no caps context */); | |
2746 | kick_flushing_inode_caps(mdsc, session, inode); | |
2747 | up_read(&mdsc->snap_rwsem); | |
2748 | ||
2749 | /* make sure we re-request max_size, if necessary */ | |
2750 | spin_lock(&inode->i_lock); | |
2751 | ci->i_requested_max_size = 0; | |
2752 | spin_unlock(&inode->i_lock); | |
2753 | } | |
2754 | ||
2755 | /* | |
2756 | * Handle a caps message from the MDS. | |
2757 | * | |
2758 | * Identify the appropriate session, inode, and call the right handler | |
2759 | * based on the cap op. | |
2760 | */ | |
2761 | void ceph_handle_caps(struct ceph_mds_session *session, | |
2762 | struct ceph_msg *msg) | |
2763 | { | |
2764 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2765 | struct super_block *sb = mdsc->fsc->sb; | |
2766 | struct inode *inode; | |
2767 | struct ceph_cap *cap; | |
2768 | struct ceph_mds_caps *h; | |
2769 | int mds = session->s_mds; | |
2770 | int op; | |
2771 | u32 seq, mseq; | |
2772 | struct ceph_vino vino; | |
2773 | u64 cap_id; | |
2774 | u64 size, max_size; | |
2775 | u64 tid; | |
2776 | void *snaptrace; | |
2777 | size_t snaptrace_len; | |
2778 | void *flock; | |
2779 | u32 flock_len; | |
2780 | int open_target_sessions = 0; | |
2781 | ||
2782 | dout("handle_caps from mds%d\n", mds); | |
2783 | ||
2784 | /* decode */ | |
2785 | tid = le64_to_cpu(msg->hdr.tid); | |
2786 | if (msg->front.iov_len < sizeof(*h)) | |
2787 | goto bad; | |
2788 | h = msg->front.iov_base; | |
2789 | op = le32_to_cpu(h->op); | |
2790 | vino.ino = le64_to_cpu(h->ino); | |
2791 | vino.snap = CEPH_NOSNAP; | |
2792 | cap_id = le64_to_cpu(h->cap_id); | |
2793 | seq = le32_to_cpu(h->seq); | |
2794 | mseq = le32_to_cpu(h->migrate_seq); | |
2795 | size = le64_to_cpu(h->size); | |
2796 | max_size = le64_to_cpu(h->max_size); | |
2797 | ||
2798 | snaptrace = h + 1; | |
2799 | snaptrace_len = le32_to_cpu(h->snap_trace_len); | |
2800 | ||
2801 | if (le16_to_cpu(msg->hdr.version) >= 2) { | |
2802 | void *p, *end; | |
2803 | ||
2804 | p = snaptrace + snaptrace_len; | |
2805 | end = msg->front.iov_base + msg->front.iov_len; | |
2806 | ceph_decode_32_safe(&p, end, flock_len, bad); | |
2807 | flock = p; | |
2808 | } else { | |
2809 | flock = NULL; | |
2810 | flock_len = 0; | |
2811 | } | |
2812 | ||
2813 | mutex_lock(&session->s_mutex); | |
2814 | session->s_seq++; | |
2815 | dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, | |
2816 | (unsigned)seq); | |
2817 | ||
2818 | /* lookup ino */ | |
2819 | inode = ceph_find_inode(sb, vino); | |
2820 | dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino, | |
2821 | vino.snap, inode); | |
2822 | if (!inode) { | |
2823 | dout(" i don't have ino %llx\n", vino.ino); | |
2824 | ||
2825 | if (op == CEPH_CAP_OP_IMPORT) | |
2826 | __queue_cap_release(session, vino.ino, cap_id, | |
2827 | mseq, seq); | |
2828 | goto flush_cap_releases; | |
2829 | } | |
2830 | ||
2831 | /* these will work even if we don't have a cap yet */ | |
2832 | switch (op) { | |
2833 | case CEPH_CAP_OP_FLUSHSNAP_ACK: | |
2834 | handle_cap_flushsnap_ack(inode, tid, h, session); | |
2835 | goto done; | |
2836 | ||
2837 | case CEPH_CAP_OP_EXPORT: | |
2838 | handle_cap_export(inode, h, session, &open_target_sessions); | |
2839 | goto done; | |
2840 | ||
2841 | case CEPH_CAP_OP_IMPORT: | |
2842 | handle_cap_import(mdsc, inode, h, session, | |
2843 | snaptrace, snaptrace_len); | |
2844 | ceph_check_caps(ceph_inode(inode), 0, session); | |
2845 | goto done_unlocked; | |
2846 | } | |
2847 | ||
2848 | /* the rest require a cap */ | |
2849 | spin_lock(&inode->i_lock); | |
2850 | cap = __get_cap_for_mds(ceph_inode(inode), mds); | |
2851 | if (!cap) { | |
2852 | dout(" no cap on %p ino %llx.%llx from mds%d\n", | |
2853 | inode, ceph_ino(inode), ceph_snap(inode), mds); | |
2854 | spin_unlock(&inode->i_lock); | |
2855 | goto flush_cap_releases; | |
2856 | } | |
2857 | ||
2858 | /* note that each of these drops i_lock for us */ | |
2859 | switch (op) { | |
2860 | case CEPH_CAP_OP_REVOKE: | |
2861 | case CEPH_CAP_OP_GRANT: | |
2862 | handle_cap_grant(inode, h, session, cap, msg->middle); | |
2863 | goto done_unlocked; | |
2864 | ||
2865 | case CEPH_CAP_OP_FLUSH_ACK: | |
2866 | handle_cap_flush_ack(inode, tid, h, session, cap); | |
2867 | break; | |
2868 | ||
2869 | case CEPH_CAP_OP_TRUNC: | |
2870 | handle_cap_trunc(inode, h, session); | |
2871 | break; | |
2872 | ||
2873 | default: | |
2874 | spin_unlock(&inode->i_lock); | |
2875 | pr_err("ceph_handle_caps: unknown cap op %d %s\n", op, | |
2876 | ceph_cap_op_name(op)); | |
2877 | } | |
2878 | ||
2879 | goto done; | |
2880 | ||
2881 | flush_cap_releases: | |
2882 | /* | |
2883 | * send any full release message to try to move things | |
2884 | * along for the mds (who clearly thinks we still have this | |
2885 | * cap). | |
2886 | */ | |
2887 | ceph_add_cap_releases(mdsc, session); | |
2888 | ceph_send_cap_releases(mdsc, session); | |
2889 | ||
2890 | done: | |
2891 | mutex_unlock(&session->s_mutex); | |
2892 | done_unlocked: | |
2893 | if (inode) | |
2894 | iput(inode); | |
2895 | if (open_target_sessions) | |
2896 | ceph_mdsc_open_export_target_sessions(mdsc, session); | |
2897 | return; | |
2898 | ||
2899 | bad: | |
2900 | pr_err("ceph_handle_caps: corrupt message\n"); | |
2901 | ceph_msg_dump(msg); | |
2902 | return; | |
2903 | } | |
2904 | ||
2905 | /* | |
2906 | * Delayed work handler to process end of delayed cap release LRU list. | |
2907 | */ | |
2908 | void ceph_check_delayed_caps(struct ceph_mds_client *mdsc) | |
2909 | { | |
2910 | struct ceph_inode_info *ci; | |
2911 | int flags = CHECK_CAPS_NODELAY; | |
2912 | ||
2913 | dout("check_delayed_caps\n"); | |
2914 | while (1) { | |
2915 | spin_lock(&mdsc->cap_delay_lock); | |
2916 | if (list_empty(&mdsc->cap_delay_list)) | |
2917 | break; | |
2918 | ci = list_first_entry(&mdsc->cap_delay_list, | |
2919 | struct ceph_inode_info, | |
2920 | i_cap_delay_list); | |
2921 | if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && | |
2922 | time_before(jiffies, ci->i_hold_caps_max)) | |
2923 | break; | |
2924 | list_del_init(&ci->i_cap_delay_list); | |
2925 | spin_unlock(&mdsc->cap_delay_lock); | |
2926 | dout("check_delayed_caps on %p\n", &ci->vfs_inode); | |
2927 | ceph_check_caps(ci, flags, NULL); | |
2928 | } | |
2929 | spin_unlock(&mdsc->cap_delay_lock); | |
2930 | } | |
2931 | ||
2932 | /* | |
2933 | * Flush all dirty caps to the mds | |
2934 | */ | |
2935 | void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) | |
2936 | { | |
2937 | struct ceph_inode_info *ci; | |
2938 | struct inode *inode; | |
2939 | ||
2940 | dout("flush_dirty_caps\n"); | |
2941 | spin_lock(&mdsc->cap_dirty_lock); | |
2942 | while (!list_empty(&mdsc->cap_dirty)) { | |
2943 | ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info, | |
2944 | i_dirty_item); | |
2945 | inode = &ci->vfs_inode; | |
2946 | ihold(inode); | |
2947 | dout("flush_dirty_caps %p\n", inode); | |
2948 | spin_unlock(&mdsc->cap_dirty_lock); | |
2949 | ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL); | |
2950 | iput(inode); | |
2951 | spin_lock(&mdsc->cap_dirty_lock); | |
2952 | } | |
2953 | spin_unlock(&mdsc->cap_dirty_lock); | |
2954 | dout("flush_dirty_caps done\n"); | |
2955 | } | |
2956 | ||
2957 | /* | |
2958 | * Drop open file reference. If we were the last open file, | |
2959 | * we may need to release capabilities to the MDS (or schedule | |
2960 | * their delayed release). | |
2961 | */ | |
2962 | void ceph_put_fmode(struct ceph_inode_info *ci, int fmode) | |
2963 | { | |
2964 | struct inode *inode = &ci->vfs_inode; | |
2965 | int last = 0; | |
2966 | ||
2967 | spin_lock(&inode->i_lock); | |
2968 | dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode, | |
2969 | ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1); | |
2970 | BUG_ON(ci->i_nr_by_mode[fmode] == 0); | |
2971 | if (--ci->i_nr_by_mode[fmode] == 0) | |
2972 | last++; | |
2973 | spin_unlock(&inode->i_lock); | |
2974 | ||
2975 | if (last && ci->i_vino.snap == CEPH_NOSNAP) | |
2976 | ceph_check_caps(ci, 0, NULL); | |
2977 | } | |
2978 | ||
2979 | /* | |
2980 | * Helpers for embedding cap and dentry lease releases into mds | |
2981 | * requests. | |
2982 | * | |
2983 | * @force is used by dentry_release (below) to force inclusion of a | |
2984 | * record for the directory inode, even when there aren't any caps to | |
2985 | * drop. | |
2986 | */ | |
2987 | int ceph_encode_inode_release(void **p, struct inode *inode, | |
2988 | int mds, int drop, int unless, int force) | |
2989 | { | |
2990 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2991 | struct ceph_cap *cap; | |
2992 | struct ceph_mds_request_release *rel = *p; | |
2993 | int used, dirty; | |
2994 | int ret = 0; | |
2995 | ||
2996 | spin_lock(&inode->i_lock); | |
2997 | used = __ceph_caps_used(ci); | |
2998 | dirty = __ceph_caps_dirty(ci); | |
2999 | ||
3000 | dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n", | |
3001 | inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop), | |
3002 | ceph_cap_string(unless)); | |
3003 | ||
3004 | /* only drop unused, clean caps */ | |
3005 | drop &= ~(used | dirty); | |
3006 | ||
3007 | cap = __get_cap_for_mds(ci, mds); | |
3008 | if (cap && __cap_is_valid(cap)) { | |
3009 | if (force || | |
3010 | ((cap->issued & drop) && | |
3011 | (cap->issued & unless) == 0)) { | |
3012 | if ((cap->issued & drop) && | |
3013 | (cap->issued & unless) == 0) { | |
3014 | dout("encode_inode_release %p cap %p %s -> " | |
3015 | "%s\n", inode, cap, | |
3016 | ceph_cap_string(cap->issued), | |
3017 | ceph_cap_string(cap->issued & ~drop)); | |
3018 | cap->issued &= ~drop; | |
3019 | cap->implemented &= ~drop; | |
3020 | if (ci->i_ceph_flags & CEPH_I_NODELAY) { | |
3021 | int wanted = __ceph_caps_wanted(ci); | |
3022 | dout(" wanted %s -> %s (act %s)\n", | |
3023 | ceph_cap_string(cap->mds_wanted), | |
3024 | ceph_cap_string(cap->mds_wanted & | |
3025 | ~wanted), | |
3026 | ceph_cap_string(wanted)); | |
3027 | cap->mds_wanted &= wanted; | |
3028 | } | |
3029 | } else { | |
3030 | dout("encode_inode_release %p cap %p %s" | |
3031 | " (force)\n", inode, cap, | |
3032 | ceph_cap_string(cap->issued)); | |
3033 | } | |
3034 | ||
3035 | rel->ino = cpu_to_le64(ceph_ino(inode)); | |
3036 | rel->cap_id = cpu_to_le64(cap->cap_id); | |
3037 | rel->seq = cpu_to_le32(cap->seq); | |
3038 | rel->issue_seq = cpu_to_le32(cap->issue_seq), | |
3039 | rel->mseq = cpu_to_le32(cap->mseq); | |
3040 | rel->caps = cpu_to_le32(cap->issued); | |
3041 | rel->wanted = cpu_to_le32(cap->mds_wanted); | |
3042 | rel->dname_len = 0; | |
3043 | rel->dname_seq = 0; | |
3044 | *p += sizeof(*rel); | |
3045 | ret = 1; | |
3046 | } else { | |
3047 | dout("encode_inode_release %p cap %p %s\n", | |
3048 | inode, cap, ceph_cap_string(cap->issued)); | |
3049 | } | |
3050 | } | |
3051 | spin_unlock(&inode->i_lock); | |
3052 | return ret; | |
3053 | } | |
3054 | ||
3055 | int ceph_encode_dentry_release(void **p, struct dentry *dentry, | |
3056 | int mds, int drop, int unless) | |
3057 | { | |
3058 | struct inode *dir = dentry->d_parent->d_inode; | |
3059 | struct ceph_mds_request_release *rel = *p; | |
3060 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
3061 | int force = 0; | |
3062 | int ret; | |
3063 | ||
3064 | /* | |
3065 | * force an record for the directory caps if we have a dentry lease. | |
3066 | * this is racy (can't take i_lock and d_lock together), but it | |
3067 | * doesn't have to be perfect; the mds will revoke anything we don't | |
3068 | * release. | |
3069 | */ | |
3070 | spin_lock(&dentry->d_lock); | |
3071 | if (di->lease_session && di->lease_session->s_mds == mds) | |
3072 | force = 1; | |
3073 | spin_unlock(&dentry->d_lock); | |
3074 | ||
3075 | ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); | |
3076 | ||
3077 | spin_lock(&dentry->d_lock); | |
3078 | if (ret && di->lease_session && di->lease_session->s_mds == mds) { | |
3079 | dout("encode_dentry_release %p mds%d seq %d\n", | |
3080 | dentry, mds, (int)di->lease_seq); | |
3081 | rel->dname_len = cpu_to_le32(dentry->d_name.len); | |
3082 | memcpy(*p, dentry->d_name.name, dentry->d_name.len); | |
3083 | *p += dentry->d_name.len; | |
3084 | rel->dname_seq = cpu_to_le32(di->lease_seq); | |
3085 | __ceph_mdsc_drop_dentry_lease(dentry); | |
3086 | } | |
3087 | spin_unlock(&dentry->d_lock); | |
3088 | return ret; | |
3089 | } |