Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
a8599bd8 SW |
2 | |
3 | #include <linux/fs.h> | |
4 | #include <linux/kernel.h> | |
5 | #include <linux/sched.h> | |
5a0e3ad6 | 6 | #include <linux/slab.h> |
a8599bd8 SW |
7 | #include <linux/vmalloc.h> |
8 | #include <linux/wait.h> | |
f1a3d572 | 9 | #include <linux/writeback.h> |
a8599bd8 SW |
10 | |
11 | #include "super.h" | |
3d14c5d2 YS |
12 | #include "mds_client.h" |
13 | #include <linux/ceph/decode.h> | |
14 | #include <linux/ceph/messenger.h> | |
a8599bd8 SW |
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 | ||
37151668 | 117 | void ceph_caps_init(struct ceph_mds_client *mdsc) |
a8599bd8 | 118 | { |
37151668 YS |
119 | INIT_LIST_HEAD(&mdsc->caps_list); |
120 | spin_lock_init(&mdsc->caps_list_lock); | |
a8599bd8 SW |
121 | } |
122 | ||
37151668 | 123 | void ceph_caps_finalize(struct ceph_mds_client *mdsc) |
a8599bd8 SW |
124 | { |
125 | struct ceph_cap *cap; | |
126 | ||
37151668 YS |
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); | |
a8599bd8 SW |
131 | list_del(&cap->caps_item); |
132 | kmem_cache_free(ceph_cap_cachep, cap); | |
133 | } | |
37151668 YS |
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); | |
85ccce43 SW |
140 | } |
141 | ||
37151668 | 142 | void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta) |
85ccce43 | 143 | { |
37151668 YS |
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); | |
a8599bd8 SW |
148 | } |
149 | ||
37151668 YS |
150 | int ceph_reserve_caps(struct ceph_mds_client *mdsc, |
151 | struct ceph_cap_reservation *ctx, int need) | |
a8599bd8 SW |
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 */ | |
37151668 YS |
163 | spin_lock(&mdsc->caps_list_lock); |
164 | if (mdsc->caps_avail_count >= need) | |
a8599bd8 SW |
165 | have = need; |
166 | else | |
37151668 YS |
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); | |
a8599bd8 SW |
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 | ||
37151668 YS |
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); | |
a8599bd8 | 190 | |
37151668 YS |
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); | |
a8599bd8 SW |
195 | |
196 | ctx->count = need; | |
197 | dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", | |
37151668 YS |
198 | ctx, mdsc->caps_total_count, mdsc->caps_use_count, |
199 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
a8599bd8 SW |
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 | ||
37151668 YS |
209 | int ceph_unreserve_caps(struct ceph_mds_client *mdsc, |
210 | struct ceph_cap_reservation *ctx) | |
a8599bd8 SW |
211 | { |
212 | dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count); | |
213 | if (ctx->count) { | |
37151668 YS |
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; | |
a8599bd8 SW |
218 | ctx->count = 0; |
219 | dout("unreserve caps %d = %d used + %d resv + %d avail\n", | |
37151668 YS |
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); | |
a8599bd8 SW |
226 | } |
227 | return 0; | |
228 | } | |
229 | ||
37151668 YS |
230 | static struct ceph_cap *get_cap(struct ceph_mds_client *mdsc, |
231 | struct ceph_cap_reservation *ctx) | |
a8599bd8 SW |
232 | { |
233 | struct ceph_cap *cap = NULL; | |
234 | ||
235 | /* temporary, until we do something about cap import/export */ | |
443b3760 SW |
236 | if (!ctx) { |
237 | cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); | |
238 | if (cap) { | |
4d1d0534 | 239 | spin_lock(&mdsc->caps_list_lock); |
37151668 YS |
240 | mdsc->caps_use_count++; |
241 | mdsc->caps_total_count++; | |
4d1d0534 | 242 | spin_unlock(&mdsc->caps_list_lock); |
443b3760 SW |
243 | } |
244 | return cap; | |
245 | } | |
a8599bd8 | 246 | |
37151668 | 247 | spin_lock(&mdsc->caps_list_lock); |
a8599bd8 | 248 | dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n", |
37151668 YS |
249 | ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, |
250 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
a8599bd8 | 251 | BUG_ON(!ctx->count); |
37151668 YS |
252 | BUG_ON(ctx->count > mdsc->caps_reserve_count); |
253 | BUG_ON(list_empty(&mdsc->caps_list)); | |
a8599bd8 SW |
254 | |
255 | ctx->count--; | |
37151668 YS |
256 | mdsc->caps_reserve_count--; |
257 | mdsc->caps_use_count++; | |
a8599bd8 | 258 | |
37151668 | 259 | cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); |
a8599bd8 SW |
260 | list_del(&cap->caps_item); |
261 | ||
37151668 YS |
262 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
263 | mdsc->caps_reserve_count + mdsc->caps_avail_count); | |
264 | spin_unlock(&mdsc->caps_list_lock); | |
a8599bd8 SW |
265 | return cap; |
266 | } | |
267 | ||
37151668 | 268 | void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) |
a8599bd8 | 269 | { |
37151668 | 270 | spin_lock(&mdsc->caps_list_lock); |
7c1332b8 | 271 | dout("put_cap %p %d = %d used + %d resv + %d avail\n", |
37151668 YS |
272 | cap, mdsc->caps_total_count, mdsc->caps_use_count, |
273 | mdsc->caps_reserve_count, mdsc->caps_avail_count); | |
274 | mdsc->caps_use_count--; | |
a8599bd8 | 275 | /* |
85ccce43 SW |
276 | * Keep some preallocated caps around (ceph_min_count), to |
277 | * avoid lots of free/alloc churn. | |
a8599bd8 | 278 | */ |
37151668 YS |
279 | if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + |
280 | mdsc->caps_min_count) { | |
281 | mdsc->caps_total_count--; | |
a8599bd8 SW |
282 | kmem_cache_free(ceph_cap_cachep, cap); |
283 | } else { | |
37151668 YS |
284 | mdsc->caps_avail_count++; |
285 | list_add(&cap->caps_item, &mdsc->caps_list); | |
a8599bd8 SW |
286 | } |
287 | ||
37151668 YS |
288 | BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
289 | mdsc->caps_reserve_count + mdsc->caps_avail_count); | |
290 | spin_unlock(&mdsc->caps_list_lock); | |
a8599bd8 SW |
291 | } |
292 | ||
3d14c5d2 | 293 | void ceph_reservation_status(struct ceph_fs_client *fsc, |
85ccce43 SW |
294 | int *total, int *avail, int *used, int *reserved, |
295 | int *min) | |
a8599bd8 | 296 | { |
3d14c5d2 | 297 | struct ceph_mds_client *mdsc = fsc->mdsc; |
37151668 | 298 | |
a8599bd8 | 299 | if (total) |
37151668 | 300 | *total = mdsc->caps_total_count; |
a8599bd8 | 301 | if (avail) |
37151668 | 302 | *avail = mdsc->caps_avail_count; |
a8599bd8 | 303 | if (used) |
37151668 | 304 | *used = mdsc->caps_use_count; |
a8599bd8 | 305 | if (reserved) |
37151668 | 306 | *reserved = mdsc->caps_reserve_count; |
85ccce43 | 307 | if (min) |
37151668 | 308 | *min = mdsc->caps_min_count; |
a8599bd8 SW |
309 | } |
310 | ||
311 | /* | |
312 | * Find ceph_cap for given mds, if any. | |
313 | * | |
be655596 | 314 | * Called with i_ceph_lock held. |
a8599bd8 SW |
315 | */ |
316 | static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) | |
317 | { | |
318 | struct ceph_cap *cap; | |
319 | struct rb_node *n = ci->i_caps.rb_node; | |
320 | ||
321 | while (n) { | |
322 | cap = rb_entry(n, struct ceph_cap, ci_node); | |
323 | if (mds < cap->mds) | |
324 | n = n->rb_left; | |
325 | else if (mds > cap->mds) | |
326 | n = n->rb_right; | |
327 | else | |
328 | return cap; | |
329 | } | |
330 | return NULL; | |
331 | } | |
332 | ||
2bc50259 GF |
333 | struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) |
334 | { | |
335 | struct ceph_cap *cap; | |
336 | ||
be655596 | 337 | spin_lock(&ci->i_ceph_lock); |
2bc50259 | 338 | cap = __get_cap_for_mds(ci, mds); |
be655596 | 339 | spin_unlock(&ci->i_ceph_lock); |
2bc50259 GF |
340 | return cap; |
341 | } | |
342 | ||
a8599bd8 | 343 | /* |
33caad32 | 344 | * Return id of any MDS with a cap, preferably FILE_WR|BUFFER|EXCL, else -1. |
a8599bd8 | 345 | */ |
ca81f3f6 | 346 | static int __ceph_get_cap_mds(struct ceph_inode_info *ci) |
a8599bd8 SW |
347 | { |
348 | struct ceph_cap *cap; | |
349 | int mds = -1; | |
350 | struct rb_node *p; | |
351 | ||
33caad32 | 352 | /* prefer mds with WR|BUFFER|EXCL caps */ |
a8599bd8 SW |
353 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
354 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
355 | mds = cap->mds; | |
a8599bd8 SW |
356 | if (cap->issued & (CEPH_CAP_FILE_WR | |
357 | CEPH_CAP_FILE_BUFFER | | |
358 | CEPH_CAP_FILE_EXCL)) | |
359 | break; | |
360 | } | |
361 | return mds; | |
362 | } | |
363 | ||
364 | int ceph_get_cap_mds(struct inode *inode) | |
365 | { | |
be655596 | 366 | struct ceph_inode_info *ci = ceph_inode(inode); |
a8599bd8 | 367 | int mds; |
be655596 | 368 | spin_lock(&ci->i_ceph_lock); |
ca81f3f6 | 369 | mds = __ceph_get_cap_mds(ceph_inode(inode)); |
be655596 | 370 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
371 | return mds; |
372 | } | |
373 | ||
374 | /* | |
be655596 | 375 | * Called under i_ceph_lock. |
a8599bd8 SW |
376 | */ |
377 | static void __insert_cap_node(struct ceph_inode_info *ci, | |
378 | struct ceph_cap *new) | |
379 | { | |
380 | struct rb_node **p = &ci->i_caps.rb_node; | |
381 | struct rb_node *parent = NULL; | |
382 | struct ceph_cap *cap = NULL; | |
383 | ||
384 | while (*p) { | |
385 | parent = *p; | |
386 | cap = rb_entry(parent, struct ceph_cap, ci_node); | |
387 | if (new->mds < cap->mds) | |
388 | p = &(*p)->rb_left; | |
389 | else if (new->mds > cap->mds) | |
390 | p = &(*p)->rb_right; | |
391 | else | |
392 | BUG(); | |
393 | } | |
394 | ||
395 | rb_link_node(&new->ci_node, parent, p); | |
396 | rb_insert_color(&new->ci_node, &ci->i_caps); | |
397 | } | |
398 | ||
399 | /* | |
400 | * (re)set cap hold timeouts, which control the delayed release | |
401 | * of unused caps back to the MDS. Should be called on cap use. | |
402 | */ | |
403 | static void __cap_set_timeouts(struct ceph_mds_client *mdsc, | |
404 | struct ceph_inode_info *ci) | |
405 | { | |
3d14c5d2 | 406 | struct ceph_mount_options *ma = mdsc->fsc->mount_options; |
a8599bd8 SW |
407 | |
408 | ci->i_hold_caps_min = round_jiffies(jiffies + | |
409 | ma->caps_wanted_delay_min * HZ); | |
410 | ci->i_hold_caps_max = round_jiffies(jiffies + | |
411 | ma->caps_wanted_delay_max * HZ); | |
412 | dout("__cap_set_timeouts %p min %lu max %lu\n", &ci->vfs_inode, | |
413 | ci->i_hold_caps_min - jiffies, ci->i_hold_caps_max - jiffies); | |
414 | } | |
415 | ||
416 | /* | |
417 | * (Re)queue cap at the end of the delayed cap release list. | |
418 | * | |
419 | * If I_FLUSH is set, leave the inode at the front of the list. | |
420 | * | |
be655596 | 421 | * Caller holds i_ceph_lock |
a8599bd8 SW |
422 | * -> we take mdsc->cap_delay_lock |
423 | */ | |
424 | static void __cap_delay_requeue(struct ceph_mds_client *mdsc, | |
425 | struct ceph_inode_info *ci) | |
426 | { | |
427 | __cap_set_timeouts(mdsc, ci); | |
428 | dout("__cap_delay_requeue %p flags %d at %lu\n", &ci->vfs_inode, | |
429 | ci->i_ceph_flags, ci->i_hold_caps_max); | |
430 | if (!mdsc->stopping) { | |
431 | spin_lock(&mdsc->cap_delay_lock); | |
432 | if (!list_empty(&ci->i_cap_delay_list)) { | |
433 | if (ci->i_ceph_flags & CEPH_I_FLUSH) | |
434 | goto no_change; | |
435 | list_del_init(&ci->i_cap_delay_list); | |
436 | } | |
437 | list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); | |
438 | no_change: | |
439 | spin_unlock(&mdsc->cap_delay_lock); | |
440 | } | |
441 | } | |
442 | ||
443 | /* | |
444 | * Queue an inode for immediate writeback. Mark inode with I_FLUSH, | |
445 | * indicating we should send a cap message to flush dirty metadata | |
446 | * asap, and move to the front of the delayed cap list. | |
447 | */ | |
448 | static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, | |
449 | struct ceph_inode_info *ci) | |
450 | { | |
451 | dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode); | |
452 | spin_lock(&mdsc->cap_delay_lock); | |
453 | ci->i_ceph_flags |= CEPH_I_FLUSH; | |
454 | if (!list_empty(&ci->i_cap_delay_list)) | |
455 | list_del_init(&ci->i_cap_delay_list); | |
456 | list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); | |
457 | spin_unlock(&mdsc->cap_delay_lock); | |
458 | } | |
459 | ||
460 | /* | |
461 | * Cancel delayed work on cap. | |
462 | * | |
be655596 | 463 | * Caller must hold i_ceph_lock. |
a8599bd8 SW |
464 | */ |
465 | static void __cap_delay_cancel(struct ceph_mds_client *mdsc, | |
466 | struct ceph_inode_info *ci) | |
467 | { | |
468 | dout("__cap_delay_cancel %p\n", &ci->vfs_inode); | |
469 | if (list_empty(&ci->i_cap_delay_list)) | |
470 | return; | |
471 | spin_lock(&mdsc->cap_delay_lock); | |
472 | list_del_init(&ci->i_cap_delay_list); | |
473 | spin_unlock(&mdsc->cap_delay_lock); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Common issue checks for add_cap, handle_cap_grant. | |
478 | */ | |
479 | static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, | |
480 | unsigned issued) | |
481 | { | |
482 | unsigned had = __ceph_caps_issued(ci, NULL); | |
483 | ||
484 | /* | |
485 | * Each time we receive FILE_CACHE anew, we increment | |
486 | * i_rdcache_gen. | |
487 | */ | |
2962507c SW |
488 | if ((issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && |
489 | (had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) | |
a8599bd8 SW |
490 | ci->i_rdcache_gen++; |
491 | ||
492 | /* | |
c6ffe100 | 493 | * if we are newly issued FILE_SHARED, clear D_COMPLETE; we |
a8599bd8 SW |
494 | * don't know what happened to this directory while we didn't |
495 | * have the cap. | |
496 | */ | |
497 | if ((issued & CEPH_CAP_FILE_SHARED) && | |
498 | (had & CEPH_CAP_FILE_SHARED) == 0) { | |
499 | ci->i_shared_gen++; | |
c6ffe100 SW |
500 | if (S_ISDIR(ci->vfs_inode.i_mode)) |
501 | ceph_dir_clear_complete(&ci->vfs_inode); | |
a8599bd8 SW |
502 | } |
503 | } | |
504 | ||
505 | /* | |
506 | * Add a capability under the given MDS session. | |
507 | * | |
508 | * Caller should hold session snap_rwsem (read) and s_mutex. | |
509 | * | |
510 | * @fmode is the open file mode, if we are opening a file, otherwise | |
511 | * it is < 0. (This is so we can atomically add the cap and add an | |
512 | * open file reference to it.) | |
513 | */ | |
514 | int ceph_add_cap(struct inode *inode, | |
515 | struct ceph_mds_session *session, u64 cap_id, | |
516 | int fmode, unsigned issued, unsigned wanted, | |
517 | unsigned seq, unsigned mseq, u64 realmino, int flags, | |
518 | struct ceph_cap_reservation *caps_reservation) | |
519 | { | |
3d14c5d2 | 520 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
a8599bd8 SW |
521 | struct ceph_inode_info *ci = ceph_inode(inode); |
522 | struct ceph_cap *new_cap = NULL; | |
523 | struct ceph_cap *cap; | |
524 | int mds = session->s_mds; | |
525 | int actual_wanted; | |
526 | ||
527 | dout("add_cap %p mds%d cap %llx %s seq %d\n", inode, | |
528 | session->s_mds, cap_id, ceph_cap_string(issued), seq); | |
529 | ||
530 | /* | |
531 | * If we are opening the file, include file mode wanted bits | |
532 | * in wanted. | |
533 | */ | |
534 | if (fmode >= 0) | |
535 | wanted |= ceph_caps_for_mode(fmode); | |
536 | ||
537 | retry: | |
be655596 | 538 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
539 | cap = __get_cap_for_mds(ci, mds); |
540 | if (!cap) { | |
541 | if (new_cap) { | |
542 | cap = new_cap; | |
543 | new_cap = NULL; | |
544 | } else { | |
be655596 | 545 | spin_unlock(&ci->i_ceph_lock); |
37151668 | 546 | new_cap = get_cap(mdsc, caps_reservation); |
a8599bd8 SW |
547 | if (new_cap == NULL) |
548 | return -ENOMEM; | |
549 | goto retry; | |
550 | } | |
551 | ||
552 | cap->issued = 0; | |
553 | cap->implemented = 0; | |
554 | cap->mds = mds; | |
555 | cap->mds_wanted = 0; | |
556 | ||
557 | cap->ci = ci; | |
558 | __insert_cap_node(ci, cap); | |
559 | ||
560 | /* clear out old exporting info? (i.e. on cap import) */ | |
561 | if (ci->i_cap_exporting_mds == mds) { | |
562 | ci->i_cap_exporting_issued = 0; | |
563 | ci->i_cap_exporting_mseq = 0; | |
564 | ci->i_cap_exporting_mds = -1; | |
565 | } | |
566 | ||
567 | /* add to session cap list */ | |
568 | cap->session = session; | |
569 | spin_lock(&session->s_cap_lock); | |
570 | list_add_tail(&cap->session_caps, &session->s_caps); | |
571 | session->s_nr_caps++; | |
572 | spin_unlock(&session->s_cap_lock); | |
3540303f SW |
573 | } else if (new_cap) |
574 | ceph_put_cap(mdsc, new_cap); | |
a8599bd8 SW |
575 | |
576 | if (!ci->i_snap_realm) { | |
577 | /* | |
578 | * add this inode to the appropriate snap realm | |
579 | */ | |
580 | struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, | |
581 | realmino); | |
582 | if (realm) { | |
583 | ceph_get_snap_realm(mdsc, realm); | |
584 | spin_lock(&realm->inodes_with_caps_lock); | |
585 | ci->i_snap_realm = realm; | |
586 | list_add(&ci->i_snap_realm_item, | |
587 | &realm->inodes_with_caps); | |
588 | spin_unlock(&realm->inodes_with_caps_lock); | |
589 | } else { | |
590 | pr_err("ceph_add_cap: couldn't find snap realm %llx\n", | |
591 | realmino); | |
b8cd07e7 | 592 | WARN_ON(!realm); |
a8599bd8 SW |
593 | } |
594 | } | |
595 | ||
596 | __check_cap_issue(ci, cap, issued); | |
597 | ||
598 | /* | |
599 | * If we are issued caps we don't want, or the mds' wanted | |
600 | * value appears to be off, queue a check so we'll release | |
601 | * later and/or update the mds wanted value. | |
602 | */ | |
603 | actual_wanted = __ceph_caps_wanted(ci); | |
604 | if ((wanted & ~actual_wanted) || | |
605 | (issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { | |
606 | dout(" issued %s, mds wanted %s, actual %s, queueing\n", | |
607 | ceph_cap_string(issued), ceph_cap_string(wanted), | |
608 | ceph_cap_string(actual_wanted)); | |
609 | __cap_delay_requeue(mdsc, ci); | |
610 | } | |
611 | ||
612 | if (flags & CEPH_CAP_FLAG_AUTH) | |
613 | ci->i_auth_cap = cap; | |
8a92a119 | 614 | else if (ci->i_auth_cap == cap) { |
a8599bd8 | 615 | ci->i_auth_cap = NULL; |
8a92a119 YZ |
616 | spin_lock(&mdsc->cap_dirty_lock); |
617 | if (!list_empty(&ci->i_dirty_item)) { | |
618 | dout(" moving %p to cap_dirty_migrating\n", inode); | |
619 | list_move(&ci->i_dirty_item, | |
620 | &mdsc->cap_dirty_migrating); | |
621 | } | |
622 | spin_unlock(&mdsc->cap_dirty_lock); | |
623 | } | |
a8599bd8 SW |
624 | |
625 | dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n", | |
626 | inode, ceph_vinop(inode), cap, ceph_cap_string(issued), | |
627 | ceph_cap_string(issued|cap->issued), seq, mds); | |
628 | cap->cap_id = cap_id; | |
629 | cap->issued = issued; | |
630 | cap->implemented |= issued; | |
631 | cap->mds_wanted |= wanted; | |
632 | cap->seq = seq; | |
633 | cap->issue_seq = seq; | |
634 | cap->mseq = mseq; | |
685f9a5d | 635 | cap->cap_gen = session->s_cap_gen; |
a8599bd8 SW |
636 | |
637 | if (fmode >= 0) | |
638 | __ceph_get_fmode(ci, fmode); | |
be655596 | 639 | spin_unlock(&ci->i_ceph_lock); |
03066f23 | 640 | wake_up_all(&ci->i_cap_wq); |
a8599bd8 SW |
641 | return 0; |
642 | } | |
643 | ||
644 | /* | |
645 | * Return true if cap has not timed out and belongs to the current | |
646 | * generation of the MDS session (i.e. has not gone 'stale' due to | |
647 | * us losing touch with the mds). | |
648 | */ | |
649 | static int __cap_is_valid(struct ceph_cap *cap) | |
650 | { | |
651 | unsigned long ttl; | |
cdac8303 | 652 | u32 gen; |
a8599bd8 | 653 | |
d8fb02ab | 654 | spin_lock(&cap->session->s_gen_ttl_lock); |
a8599bd8 SW |
655 | gen = cap->session->s_cap_gen; |
656 | ttl = cap->session->s_cap_ttl; | |
d8fb02ab | 657 | spin_unlock(&cap->session->s_gen_ttl_lock); |
a8599bd8 | 658 | |
685f9a5d | 659 | if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { |
a8599bd8 SW |
660 | dout("__cap_is_valid %p cap %p issued %s " |
661 | "but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode, | |
685f9a5d | 662 | cap, ceph_cap_string(cap->issued), cap->cap_gen, gen); |
a8599bd8 SW |
663 | return 0; |
664 | } | |
665 | ||
666 | return 1; | |
667 | } | |
668 | ||
669 | /* | |
670 | * Return set of valid cap bits issued to us. Note that caps time | |
671 | * out, and may be invalidated in bulk if the client session times out | |
672 | * and session->s_cap_gen is bumped. | |
673 | */ | |
674 | int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) | |
675 | { | |
7af8f1e4 | 676 | int have = ci->i_snap_caps | ci->i_cap_exporting_issued; |
a8599bd8 SW |
677 | struct ceph_cap *cap; |
678 | struct rb_node *p; | |
679 | ||
680 | if (implemented) | |
681 | *implemented = 0; | |
682 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
683 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
684 | if (!__cap_is_valid(cap)) | |
685 | continue; | |
686 | dout("__ceph_caps_issued %p cap %p issued %s\n", | |
687 | &ci->vfs_inode, cap, ceph_cap_string(cap->issued)); | |
688 | have |= cap->issued; | |
689 | if (implemented) | |
690 | *implemented |= cap->implemented; | |
691 | } | |
692 | return have; | |
693 | } | |
694 | ||
695 | /* | |
696 | * Get cap bits issued by caps other than @ocap | |
697 | */ | |
698 | int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) | |
699 | { | |
700 | int have = ci->i_snap_caps; | |
701 | struct ceph_cap *cap; | |
702 | struct rb_node *p; | |
703 | ||
704 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
705 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
706 | if (cap == ocap) | |
707 | continue; | |
708 | if (!__cap_is_valid(cap)) | |
709 | continue; | |
710 | have |= cap->issued; | |
711 | } | |
712 | return have; | |
713 | } | |
714 | ||
715 | /* | |
716 | * Move a cap to the end of the LRU (oldest caps at list head, newest | |
717 | * at list tail). | |
718 | */ | |
719 | static void __touch_cap(struct ceph_cap *cap) | |
720 | { | |
721 | struct ceph_mds_session *s = cap->session; | |
722 | ||
a8599bd8 | 723 | spin_lock(&s->s_cap_lock); |
7c1332b8 | 724 | if (s->s_cap_iterator == NULL) { |
5dacf091 SW |
725 | dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, |
726 | s->s_mds); | |
727 | list_move_tail(&cap->session_caps, &s->s_caps); | |
728 | } else { | |
729 | dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", | |
730 | &cap->ci->vfs_inode, cap, s->s_mds); | |
731 | } | |
a8599bd8 SW |
732 | spin_unlock(&s->s_cap_lock); |
733 | } | |
734 | ||
735 | /* | |
736 | * Check if we hold the given mask. If so, move the cap(s) to the | |
737 | * front of their respective LRUs. (This is the preferred way for | |
738 | * callers to check for caps they want.) | |
739 | */ | |
740 | int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) | |
741 | { | |
742 | struct ceph_cap *cap; | |
743 | struct rb_node *p; | |
744 | int have = ci->i_snap_caps; | |
745 | ||
746 | if ((have & mask) == mask) { | |
747 | dout("__ceph_caps_issued_mask %p snap issued %s" | |
748 | " (mask %s)\n", &ci->vfs_inode, | |
749 | ceph_cap_string(have), | |
750 | ceph_cap_string(mask)); | |
751 | return 1; | |
752 | } | |
753 | ||
754 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
755 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
756 | if (!__cap_is_valid(cap)) | |
757 | continue; | |
758 | if ((cap->issued & mask) == mask) { | |
759 | dout("__ceph_caps_issued_mask %p cap %p issued %s" | |
760 | " (mask %s)\n", &ci->vfs_inode, cap, | |
761 | ceph_cap_string(cap->issued), | |
762 | ceph_cap_string(mask)); | |
763 | if (touch) | |
764 | __touch_cap(cap); | |
765 | return 1; | |
766 | } | |
767 | ||
768 | /* does a combination of caps satisfy mask? */ | |
769 | have |= cap->issued; | |
770 | if ((have & mask) == mask) { | |
771 | dout("__ceph_caps_issued_mask %p combo issued %s" | |
772 | " (mask %s)\n", &ci->vfs_inode, | |
773 | ceph_cap_string(cap->issued), | |
774 | ceph_cap_string(mask)); | |
775 | if (touch) { | |
776 | struct rb_node *q; | |
777 | ||
25985edc | 778 | /* touch this + preceding caps */ |
a8599bd8 SW |
779 | __touch_cap(cap); |
780 | for (q = rb_first(&ci->i_caps); q != p; | |
781 | q = rb_next(q)) { | |
782 | cap = rb_entry(q, struct ceph_cap, | |
783 | ci_node); | |
784 | if (!__cap_is_valid(cap)) | |
785 | continue; | |
786 | __touch_cap(cap); | |
787 | } | |
788 | } | |
789 | return 1; | |
790 | } | |
791 | } | |
792 | ||
793 | return 0; | |
794 | } | |
795 | ||
796 | /* | |
797 | * Return true if mask caps are currently being revoked by an MDS. | |
798 | */ | |
799 | int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) | |
800 | { | |
801 | struct inode *inode = &ci->vfs_inode; | |
802 | struct ceph_cap *cap; | |
803 | struct rb_node *p; | |
804 | int ret = 0; | |
805 | ||
be655596 | 806 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
807 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
808 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
809 | if (__cap_is_valid(cap) && | |
810 | (cap->implemented & ~cap->issued & mask)) { | |
811 | ret = 1; | |
812 | break; | |
813 | } | |
814 | } | |
be655596 | 815 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
816 | dout("ceph_caps_revoking %p %s = %d\n", inode, |
817 | ceph_cap_string(mask), ret); | |
818 | return ret; | |
819 | } | |
820 | ||
821 | int __ceph_caps_used(struct ceph_inode_info *ci) | |
822 | { | |
823 | int used = 0; | |
824 | if (ci->i_pin_ref) | |
825 | used |= CEPH_CAP_PIN; | |
826 | if (ci->i_rd_ref) | |
827 | used |= CEPH_CAP_FILE_RD; | |
a43fb731 | 828 | if (ci->i_rdcache_ref || ci->vfs_inode.i_data.nrpages) |
a8599bd8 SW |
829 | used |= CEPH_CAP_FILE_CACHE; |
830 | if (ci->i_wr_ref) | |
831 | used |= CEPH_CAP_FILE_WR; | |
d3d0720d | 832 | if (ci->i_wb_ref || ci->i_wrbuffer_ref) |
a8599bd8 SW |
833 | used |= CEPH_CAP_FILE_BUFFER; |
834 | return used; | |
835 | } | |
836 | ||
837 | /* | |
838 | * wanted, by virtue of open file modes | |
839 | */ | |
840 | int __ceph_caps_file_wanted(struct ceph_inode_info *ci) | |
841 | { | |
842 | int want = 0; | |
843 | int mode; | |
33caad32 | 844 | for (mode = 0; mode < CEPH_FILE_MODE_NUM; mode++) |
a8599bd8 SW |
845 | if (ci->i_nr_by_mode[mode]) |
846 | want |= ceph_caps_for_mode(mode); | |
847 | return want; | |
848 | } | |
849 | ||
850 | /* | |
851 | * Return caps we have registered with the MDS(s) as 'wanted'. | |
852 | */ | |
853 | int __ceph_caps_mds_wanted(struct ceph_inode_info *ci) | |
854 | { | |
855 | struct ceph_cap *cap; | |
856 | struct rb_node *p; | |
857 | int mds_wanted = 0; | |
858 | ||
859 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
860 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
861 | if (!__cap_is_valid(cap)) | |
862 | continue; | |
863 | mds_wanted |= cap->mds_wanted; | |
864 | } | |
865 | return mds_wanted; | |
866 | } | |
867 | ||
868 | /* | |
be655596 | 869 | * called under i_ceph_lock |
a8599bd8 SW |
870 | */ |
871 | static int __ceph_is_any_caps(struct ceph_inode_info *ci) | |
872 | { | |
873 | return !RB_EMPTY_ROOT(&ci->i_caps) || ci->i_cap_exporting_mds >= 0; | |
874 | } | |
875 | ||
876 | /* | |
f818a736 SW |
877 | * Remove a cap. Take steps to deal with a racing iterate_session_caps. |
878 | * | |
be655596 | 879 | * caller should hold i_ceph_lock. |
a6369741 | 880 | * caller will not hold session s_mutex if called from destroy_inode. |
a8599bd8 | 881 | */ |
7c1332b8 | 882 | void __ceph_remove_cap(struct ceph_cap *cap) |
a8599bd8 SW |
883 | { |
884 | struct ceph_mds_session *session = cap->session; | |
885 | struct ceph_inode_info *ci = cap->ci; | |
640ef79d | 886 | struct ceph_mds_client *mdsc = |
3d14c5d2 | 887 | ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; |
f818a736 | 888 | int removed = 0; |
a8599bd8 SW |
889 | |
890 | dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode); | |
891 | ||
7c1332b8 SW |
892 | /* remove from session list */ |
893 | spin_lock(&session->s_cap_lock); | |
894 | if (session->s_cap_iterator == cap) { | |
895 | /* not yet, we are iterating over this very cap */ | |
896 | dout("__ceph_remove_cap delaying %p removal from session %p\n", | |
897 | cap, cap->session); | |
898 | } else { | |
899 | list_del_init(&cap->session_caps); | |
900 | session->s_nr_caps--; | |
901 | cap->session = NULL; | |
f818a736 | 902 | removed = 1; |
7c1332b8 | 903 | } |
f818a736 SW |
904 | /* protect backpointer with s_cap_lock: see iterate_session_caps */ |
905 | cap->ci = NULL; | |
7c1332b8 SW |
906 | spin_unlock(&session->s_cap_lock); |
907 | ||
f818a736 SW |
908 | /* remove from inode list */ |
909 | rb_erase(&cap->ci_node, &ci->i_caps); | |
910 | if (ci->i_auth_cap == cap) | |
911 | ci->i_auth_cap = NULL; | |
912 | ||
913 | if (removed) | |
37151668 | 914 | ceph_put_cap(mdsc, cap); |
a8599bd8 SW |
915 | |
916 | if (!__ceph_is_any_caps(ci) && ci->i_snap_realm) { | |
917 | struct ceph_snap_realm *realm = ci->i_snap_realm; | |
918 | spin_lock(&realm->inodes_with_caps_lock); | |
919 | list_del_init(&ci->i_snap_realm_item); | |
920 | ci->i_snap_realm_counter++; | |
921 | ci->i_snap_realm = NULL; | |
922 | spin_unlock(&realm->inodes_with_caps_lock); | |
923 | ceph_put_snap_realm(mdsc, realm); | |
924 | } | |
925 | if (!__ceph_is_any_real_caps(ci)) | |
926 | __cap_delay_cancel(mdsc, ci); | |
927 | } | |
928 | ||
929 | /* | |
930 | * Build and send a cap message to the given MDS. | |
931 | * | |
932 | * Caller should be holding s_mutex. | |
933 | */ | |
934 | static int send_cap_msg(struct ceph_mds_session *session, | |
935 | u64 ino, u64 cid, int op, | |
936 | int caps, int wanted, int dirty, | |
937 | u32 seq, u64 flush_tid, u32 issue_seq, u32 mseq, | |
938 | u64 size, u64 max_size, | |
939 | struct timespec *mtime, struct timespec *atime, | |
940 | u64 time_warp_seq, | |
5706b27d | 941 | uid_t uid, gid_t gid, umode_t mode, |
a8599bd8 SW |
942 | u64 xattr_version, |
943 | struct ceph_buffer *xattrs_buf, | |
944 | u64 follows) | |
945 | { | |
946 | struct ceph_mds_caps *fc; | |
947 | struct ceph_msg *msg; | |
948 | ||
949 | dout("send_cap_msg %s %llx %llx caps %s wanted %s dirty %s" | |
950 | " seq %u/%u mseq %u follows %lld size %llu/%llu" | |
951 | " xattr_ver %llu xattr_len %d\n", ceph_cap_op_name(op), | |
952 | cid, ino, ceph_cap_string(caps), ceph_cap_string(wanted), | |
953 | ceph_cap_string(dirty), | |
954 | seq, issue_seq, mseq, follows, size, max_size, | |
955 | xattr_version, xattrs_buf ? (int)xattrs_buf->vec.iov_len : 0); | |
956 | ||
b61c2763 | 957 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, sizeof(*fc), GFP_NOFS, false); |
a79832f2 SW |
958 | if (!msg) |
959 | return -ENOMEM; | |
a8599bd8 | 960 | |
6df058c0 | 961 | msg->hdr.tid = cpu_to_le64(flush_tid); |
a8599bd8 | 962 | |
6df058c0 | 963 | fc = msg->front.iov_base; |
a8599bd8 SW |
964 | memset(fc, 0, sizeof(*fc)); |
965 | ||
966 | fc->cap_id = cpu_to_le64(cid); | |
967 | fc->op = cpu_to_le32(op); | |
968 | fc->seq = cpu_to_le32(seq); | |
a8599bd8 SW |
969 | fc->issue_seq = cpu_to_le32(issue_seq); |
970 | fc->migrate_seq = cpu_to_le32(mseq); | |
971 | fc->caps = cpu_to_le32(caps); | |
972 | fc->wanted = cpu_to_le32(wanted); | |
973 | fc->dirty = cpu_to_le32(dirty); | |
974 | fc->ino = cpu_to_le64(ino); | |
975 | fc->snap_follows = cpu_to_le64(follows); | |
976 | ||
977 | fc->size = cpu_to_le64(size); | |
978 | fc->max_size = cpu_to_le64(max_size); | |
979 | if (mtime) | |
980 | ceph_encode_timespec(&fc->mtime, mtime); | |
981 | if (atime) | |
982 | ceph_encode_timespec(&fc->atime, atime); | |
983 | fc->time_warp_seq = cpu_to_le32(time_warp_seq); | |
984 | ||
985 | fc->uid = cpu_to_le32(uid); | |
986 | fc->gid = cpu_to_le32(gid); | |
987 | fc->mode = cpu_to_le32(mode); | |
988 | ||
989 | fc->xattr_version = cpu_to_le64(xattr_version); | |
990 | if (xattrs_buf) { | |
991 | msg->middle = ceph_buffer_get(xattrs_buf); | |
992 | fc->xattr_len = cpu_to_le32(xattrs_buf->vec.iov_len); | |
993 | msg->hdr.middle_len = cpu_to_le32(xattrs_buf->vec.iov_len); | |
994 | } | |
995 | ||
996 | ceph_con_send(&session->s_con, msg); | |
997 | return 0; | |
998 | } | |
999 | ||
3d7ded4d SW |
1000 | static void __queue_cap_release(struct ceph_mds_session *session, |
1001 | u64 ino, u64 cap_id, u32 migrate_seq, | |
1002 | u32 issue_seq) | |
1003 | { | |
1004 | struct ceph_msg *msg; | |
1005 | struct ceph_mds_cap_release *head; | |
1006 | struct ceph_mds_cap_item *item; | |
1007 | ||
1008 | spin_lock(&session->s_cap_lock); | |
1009 | BUG_ON(!session->s_num_cap_releases); | |
1010 | msg = list_first_entry(&session->s_cap_releases, | |
1011 | struct ceph_msg, list_head); | |
1012 | ||
1013 | dout(" adding %llx release to mds%d msg %p (%d left)\n", | |
1014 | ino, session->s_mds, msg, session->s_num_cap_releases); | |
1015 | ||
1016 | BUG_ON(msg->front.iov_len + sizeof(*item) > PAGE_CACHE_SIZE); | |
1017 | head = msg->front.iov_base; | |
b905a7f8 | 1018 | le32_add_cpu(&head->num, 1); |
3d7ded4d SW |
1019 | item = msg->front.iov_base + msg->front.iov_len; |
1020 | item->ino = cpu_to_le64(ino); | |
1021 | item->cap_id = cpu_to_le64(cap_id); | |
1022 | item->migrate_seq = cpu_to_le32(migrate_seq); | |
1023 | item->seq = cpu_to_le32(issue_seq); | |
1024 | ||
1025 | session->s_num_cap_releases--; | |
1026 | ||
1027 | msg->front.iov_len += sizeof(*item); | |
1028 | if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { | |
1029 | dout(" release msg %p full\n", msg); | |
1030 | list_move_tail(&msg->list_head, &session->s_cap_releases_done); | |
1031 | } else { | |
1032 | dout(" release msg %p at %d/%d (%d)\n", msg, | |
1033 | (int)le32_to_cpu(head->num), | |
1034 | (int)CEPH_CAPS_PER_RELEASE, | |
1035 | (int)msg->front.iov_len); | |
1036 | } | |
1037 | spin_unlock(&session->s_cap_lock); | |
1038 | } | |
1039 | ||
a8599bd8 | 1040 | /* |
a6369741 | 1041 | * Queue cap releases when an inode is dropped from our cache. Since |
be655596 | 1042 | * inode is about to be destroyed, there is no need for i_ceph_lock. |
a8599bd8 SW |
1043 | */ |
1044 | void ceph_queue_caps_release(struct inode *inode) | |
1045 | { | |
1046 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1047 | struct rb_node *p; | |
1048 | ||
a8599bd8 SW |
1049 | p = rb_first(&ci->i_caps); |
1050 | while (p) { | |
1051 | struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); | |
1052 | struct ceph_mds_session *session = cap->session; | |
a8599bd8 | 1053 | |
3d7ded4d SW |
1054 | __queue_cap_release(session, ceph_ino(inode), cap->cap_id, |
1055 | cap->mseq, cap->issue_seq); | |
a8599bd8 | 1056 | p = rb_next(p); |
7c1332b8 | 1057 | __ceph_remove_cap(cap); |
a8599bd8 | 1058 | } |
a8599bd8 SW |
1059 | } |
1060 | ||
1061 | /* | |
1062 | * Send a cap msg on the given inode. Update our caps state, then | |
be655596 | 1063 | * drop i_ceph_lock and send the message. |
a8599bd8 SW |
1064 | * |
1065 | * Make note of max_size reported/requested from mds, revoked caps | |
1066 | * that have now been implemented. | |
1067 | * | |
1068 | * Make half-hearted attempt ot to invalidate page cache if we are | |
1069 | * dropping RDCACHE. Note that this will leave behind locked pages | |
1070 | * that we'll then need to deal with elsewhere. | |
1071 | * | |
1072 | * Return non-zero if delayed release, or we experienced an error | |
1073 | * such that the caller should requeue + retry later. | |
1074 | * | |
be655596 | 1075 | * called with i_ceph_lock, then drops it. |
a8599bd8 SW |
1076 | * caller should hold snap_rwsem (read), s_mutex. |
1077 | */ | |
1078 | static int __send_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap, | |
1079 | int op, int used, int want, int retain, int flushing, | |
1080 | unsigned *pflush_tid) | |
be655596 | 1081 | __releases(cap->ci->i_ceph_lock) |
a8599bd8 SW |
1082 | { |
1083 | struct ceph_inode_info *ci = cap->ci; | |
1084 | struct inode *inode = &ci->vfs_inode; | |
1085 | u64 cap_id = cap->cap_id; | |
68c28323 | 1086 | int held, revoking, dropping, keep; |
a8599bd8 SW |
1087 | u64 seq, issue_seq, mseq, time_warp_seq, follows; |
1088 | u64 size, max_size; | |
1089 | struct timespec mtime, atime; | |
1090 | int wake = 0; | |
5706b27d | 1091 | umode_t mode; |
a8599bd8 SW |
1092 | uid_t uid; |
1093 | gid_t gid; | |
1094 | struct ceph_mds_session *session; | |
1095 | u64 xattr_version = 0; | |
082afec9 | 1096 | struct ceph_buffer *xattr_blob = NULL; |
a8599bd8 SW |
1097 | int delayed = 0; |
1098 | u64 flush_tid = 0; | |
1099 | int i; | |
1100 | int ret; | |
1101 | ||
68c28323 SW |
1102 | held = cap->issued | cap->implemented; |
1103 | revoking = cap->implemented & ~cap->issued; | |
1104 | retain &= ~revoking; | |
1105 | dropping = cap->issued & ~retain; | |
1106 | ||
a8599bd8 SW |
1107 | dout("__send_cap %p cap %p session %p %s -> %s (revoking %s)\n", |
1108 | inode, cap, cap->session, | |
1109 | ceph_cap_string(held), ceph_cap_string(held & retain), | |
1110 | ceph_cap_string(revoking)); | |
1111 | BUG_ON((retain & CEPH_CAP_PIN) == 0); | |
1112 | ||
1113 | session = cap->session; | |
1114 | ||
1115 | /* don't release wanted unless we've waited a bit. */ | |
1116 | if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && | |
1117 | time_before(jiffies, ci->i_hold_caps_min)) { | |
1118 | dout(" delaying issued %s -> %s, wanted %s -> %s on send\n", | |
1119 | ceph_cap_string(cap->issued), | |
1120 | ceph_cap_string(cap->issued & retain), | |
1121 | ceph_cap_string(cap->mds_wanted), | |
1122 | ceph_cap_string(want)); | |
1123 | want |= cap->mds_wanted; | |
1124 | retain |= cap->issued; | |
1125 | delayed = 1; | |
1126 | } | |
1127 | ci->i_ceph_flags &= ~(CEPH_I_NODELAY | CEPH_I_FLUSH); | |
1128 | ||
1129 | cap->issued &= retain; /* drop bits we don't want */ | |
1130 | if (cap->implemented & ~cap->issued) { | |
1131 | /* | |
1132 | * Wake up any waiters on wanted -> needed transition. | |
1133 | * This is due to the weird transition from buffered | |
1134 | * to sync IO... we need to flush dirty pages _before_ | |
1135 | * allowing sync writes to avoid reordering. | |
1136 | */ | |
1137 | wake = 1; | |
1138 | } | |
1139 | cap->implemented &= cap->issued | used; | |
1140 | cap->mds_wanted = want; | |
1141 | ||
1142 | if (flushing) { | |
1143 | /* | |
1144 | * assign a tid for flush operations so we can avoid | |
1145 | * flush1 -> dirty1 -> flush2 -> flushack1 -> mark | |
1146 | * clean type races. track latest tid for every bit | |
1147 | * so we can handle flush AxFw, flush Fw, and have the | |
1148 | * first ack clean Ax. | |
1149 | */ | |
1150 | flush_tid = ++ci->i_cap_flush_last_tid; | |
1151 | if (pflush_tid) | |
1152 | *pflush_tid = flush_tid; | |
1153 | dout(" cap_flush_tid %d\n", (int)flush_tid); | |
1154 | for (i = 0; i < CEPH_CAP_BITS; i++) | |
1155 | if (flushing & (1 << i)) | |
1156 | ci->i_cap_flush_tid[i] = flush_tid; | |
7d8cb26d SW |
1157 | |
1158 | follows = ci->i_head_snapc->seq; | |
1159 | } else { | |
1160 | follows = 0; | |
a8599bd8 SW |
1161 | } |
1162 | ||
1163 | keep = cap->implemented; | |
1164 | seq = cap->seq; | |
1165 | issue_seq = cap->issue_seq; | |
1166 | mseq = cap->mseq; | |
1167 | size = inode->i_size; | |
1168 | ci->i_reported_size = size; | |
1169 | max_size = ci->i_wanted_max_size; | |
1170 | ci->i_requested_max_size = max_size; | |
1171 | mtime = inode->i_mtime; | |
1172 | atime = inode->i_atime; | |
1173 | time_warp_seq = ci->i_time_warp_seq; | |
a8599bd8 SW |
1174 | uid = inode->i_uid; |
1175 | gid = inode->i_gid; | |
1176 | mode = inode->i_mode; | |
1177 | ||
082afec9 | 1178 | if (flushing & CEPH_CAP_XATTR_EXCL) { |
a8599bd8 | 1179 | __ceph_build_xattrs_blob(ci); |
082afec9 SW |
1180 | xattr_blob = ci->i_xattrs.blob; |
1181 | xattr_version = ci->i_xattrs.version; | |
a8599bd8 SW |
1182 | } |
1183 | ||
be655596 | 1184 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 | 1185 | |
a8599bd8 SW |
1186 | ret = send_cap_msg(session, ceph_vino(inode).ino, cap_id, |
1187 | op, keep, want, flushing, seq, flush_tid, issue_seq, mseq, | |
1188 | size, max_size, &mtime, &atime, time_warp_seq, | |
082afec9 | 1189 | uid, gid, mode, xattr_version, xattr_blob, |
a8599bd8 SW |
1190 | follows); |
1191 | if (ret < 0) { | |
1192 | dout("error sending cap msg, must requeue %p\n", inode); | |
1193 | delayed = 1; | |
1194 | } | |
1195 | ||
1196 | if (wake) | |
03066f23 | 1197 | wake_up_all(&ci->i_cap_wq); |
a8599bd8 SW |
1198 | |
1199 | return delayed; | |
1200 | } | |
1201 | ||
1202 | /* | |
1203 | * When a snapshot is taken, clients accumulate dirty metadata on | |
1204 | * inodes with capabilities in ceph_cap_snaps to describe the file | |
1205 | * state at the time the snapshot was taken. This must be flushed | |
1206 | * asynchronously back to the MDS once sync writes complete and dirty | |
1207 | * data is written out. | |
1208 | * | |
e835124c SW |
1209 | * Unless @again is true, skip cap_snaps that were already sent to |
1210 | * the MDS (i.e., during this session). | |
1211 | * | |
be655596 | 1212 | * Called under i_ceph_lock. Takes s_mutex as needed. |
a8599bd8 SW |
1213 | */ |
1214 | void __ceph_flush_snaps(struct ceph_inode_info *ci, | |
e835124c SW |
1215 | struct ceph_mds_session **psession, |
1216 | int again) | |
be655596 SW |
1217 | __releases(ci->i_ceph_lock) |
1218 | __acquires(ci->i_ceph_lock) | |
a8599bd8 SW |
1219 | { |
1220 | struct inode *inode = &ci->vfs_inode; | |
1221 | int mds; | |
1222 | struct ceph_cap_snap *capsnap; | |
1223 | u32 mseq; | |
3d14c5d2 | 1224 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
a8599bd8 SW |
1225 | struct ceph_mds_session *session = NULL; /* if session != NULL, we hold |
1226 | session->s_mutex */ | |
1227 | u64 next_follows = 0; /* keep track of how far we've gotten through the | |
1228 | i_cap_snaps list, and skip these entries next time | |
1229 | around to avoid an infinite loop */ | |
1230 | ||
1231 | if (psession) | |
1232 | session = *psession; | |
1233 | ||
1234 | dout("__flush_snaps %p\n", inode); | |
1235 | retry: | |
1236 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
1237 | /* avoid an infiniute loop after retry */ | |
1238 | if (capsnap->follows < next_follows) | |
1239 | continue; | |
1240 | /* | |
1241 | * we need to wait for sync writes to complete and for dirty | |
1242 | * pages to be written out. | |
1243 | */ | |
1244 | if (capsnap->dirty_pages || capsnap->writing) | |
cfc0bf66 | 1245 | break; |
a8599bd8 | 1246 | |
819ccbfa SW |
1247 | /* |
1248 | * if cap writeback already occurred, we should have dropped | |
1249 | * the capsnap in ceph_put_wrbuffer_cap_refs. | |
1250 | */ | |
1251 | BUG_ON(capsnap->dirty == 0); | |
1252 | ||
a8599bd8 | 1253 | /* pick mds, take s_mutex */ |
ca81f3f6 SW |
1254 | if (ci->i_auth_cap == NULL) { |
1255 | dout("no auth cap (migrating?), doing nothing\n"); | |
1256 | goto out; | |
1257 | } | |
e835124c SW |
1258 | |
1259 | /* only flush each capsnap once */ | |
1260 | if (!again && !list_empty(&capsnap->flushing_item)) { | |
1261 | dout("already flushed %p, skipping\n", capsnap); | |
1262 | continue; | |
1263 | } | |
1264 | ||
ca81f3f6 SW |
1265 | mds = ci->i_auth_cap->session->s_mds; |
1266 | mseq = ci->i_auth_cap->mseq; | |
1267 | ||
a8599bd8 SW |
1268 | if (session && session->s_mds != mds) { |
1269 | dout("oops, wrong session %p mutex\n", session); | |
1270 | mutex_unlock(&session->s_mutex); | |
1271 | ceph_put_mds_session(session); | |
1272 | session = NULL; | |
1273 | } | |
1274 | if (!session) { | |
be655596 | 1275 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1276 | mutex_lock(&mdsc->mutex); |
1277 | session = __ceph_lookup_mds_session(mdsc, mds); | |
1278 | mutex_unlock(&mdsc->mutex); | |
1279 | if (session) { | |
1280 | dout("inverting session/ino locks on %p\n", | |
1281 | session); | |
1282 | mutex_lock(&session->s_mutex); | |
1283 | } | |
1284 | /* | |
1285 | * if session == NULL, we raced against a cap | |
ca81f3f6 SW |
1286 | * deletion or migration. retry, and we'll |
1287 | * get a better @mds value next time. | |
a8599bd8 | 1288 | */ |
be655596 | 1289 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1290 | goto retry; |
1291 | } | |
1292 | ||
1293 | capsnap->flush_tid = ++ci->i_cap_flush_last_tid; | |
1294 | atomic_inc(&capsnap->nref); | |
1295 | if (!list_empty(&capsnap->flushing_item)) | |
1296 | list_del_init(&capsnap->flushing_item); | |
1297 | list_add_tail(&capsnap->flushing_item, | |
1298 | &session->s_cap_snaps_flushing); | |
be655596 | 1299 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 | 1300 | |
cfc0bf66 SW |
1301 | dout("flush_snaps %p cap_snap %p follows %lld tid %llu\n", |
1302 | inode, capsnap, capsnap->follows, capsnap->flush_tid); | |
a8599bd8 SW |
1303 | send_cap_msg(session, ceph_vino(inode).ino, 0, |
1304 | CEPH_CAP_OP_FLUSHSNAP, capsnap->issued, 0, | |
1305 | capsnap->dirty, 0, capsnap->flush_tid, 0, mseq, | |
1306 | capsnap->size, 0, | |
1307 | &capsnap->mtime, &capsnap->atime, | |
1308 | capsnap->time_warp_seq, | |
1309 | capsnap->uid, capsnap->gid, capsnap->mode, | |
4a625be4 | 1310 | capsnap->xattr_version, capsnap->xattr_blob, |
a8599bd8 SW |
1311 | capsnap->follows); |
1312 | ||
1313 | next_follows = capsnap->follows + 1; | |
1314 | ceph_put_cap_snap(capsnap); | |
1315 | ||
be655596 | 1316 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1317 | goto retry; |
1318 | } | |
1319 | ||
1320 | /* we flushed them all; remove this inode from the queue */ | |
1321 | spin_lock(&mdsc->snap_flush_lock); | |
1322 | list_del_init(&ci->i_snap_flush_item); | |
1323 | spin_unlock(&mdsc->snap_flush_lock); | |
1324 | ||
ca81f3f6 | 1325 | out: |
a8599bd8 SW |
1326 | if (psession) |
1327 | *psession = session; | |
1328 | else if (session) { | |
1329 | mutex_unlock(&session->s_mutex); | |
1330 | ceph_put_mds_session(session); | |
1331 | } | |
1332 | } | |
1333 | ||
1334 | static void ceph_flush_snaps(struct ceph_inode_info *ci) | |
1335 | { | |
be655596 | 1336 | spin_lock(&ci->i_ceph_lock); |
e835124c | 1337 | __ceph_flush_snaps(ci, NULL, 0); |
be655596 | 1338 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1339 | } |
1340 | ||
76e3b390 | 1341 | /* |
fca65b4a SW |
1342 | * Mark caps dirty. If inode is newly dirty, return the dirty flags. |
1343 | * Caller is then responsible for calling __mark_inode_dirty with the | |
1344 | * returned flags value. | |
76e3b390 | 1345 | */ |
fca65b4a | 1346 | int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask) |
76e3b390 | 1347 | { |
640ef79d | 1348 | struct ceph_mds_client *mdsc = |
3d14c5d2 | 1349 | ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; |
76e3b390 SW |
1350 | struct inode *inode = &ci->vfs_inode; |
1351 | int was = ci->i_dirty_caps; | |
1352 | int dirty = 0; | |
1353 | ||
1354 | dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode, | |
1355 | ceph_cap_string(mask), ceph_cap_string(was), | |
1356 | ceph_cap_string(was | mask)); | |
1357 | ci->i_dirty_caps |= mask; | |
1358 | if (was == 0) { | |
7d8cb26d SW |
1359 | if (!ci->i_head_snapc) |
1360 | ci->i_head_snapc = ceph_get_snap_context( | |
1361 | ci->i_snap_realm->cached_context); | |
0685235f YZ |
1362 | dout(" inode %p now dirty snapc %p auth cap %p\n", |
1363 | &ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap); | |
76e3b390 SW |
1364 | BUG_ON(!list_empty(&ci->i_dirty_item)); |
1365 | spin_lock(&mdsc->cap_dirty_lock); | |
0685235f YZ |
1366 | if (ci->i_auth_cap) |
1367 | list_add(&ci->i_dirty_item, &mdsc->cap_dirty); | |
1368 | else | |
1369 | list_add(&ci->i_dirty_item, | |
1370 | &mdsc->cap_dirty_migrating); | |
76e3b390 SW |
1371 | spin_unlock(&mdsc->cap_dirty_lock); |
1372 | if (ci->i_flushing_caps == 0) { | |
3772d26d | 1373 | ihold(inode); |
76e3b390 SW |
1374 | dirty |= I_DIRTY_SYNC; |
1375 | } | |
1376 | } | |
1377 | BUG_ON(list_empty(&ci->i_dirty_item)); | |
1378 | if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && | |
1379 | (mask & CEPH_CAP_FILE_BUFFER)) | |
1380 | dirty |= I_DIRTY_DATASYNC; | |
76e3b390 | 1381 | __cap_delay_requeue(mdsc, ci); |
fca65b4a | 1382 | return dirty; |
76e3b390 SW |
1383 | } |
1384 | ||
a8599bd8 SW |
1385 | /* |
1386 | * Add dirty inode to the flushing list. Assigned a seq number so we | |
1387 | * can wait for caps to flush without starving. | |
cdc35f96 | 1388 | * |
be655596 | 1389 | * Called under i_ceph_lock. |
a8599bd8 | 1390 | */ |
cdc35f96 | 1391 | static int __mark_caps_flushing(struct inode *inode, |
a8599bd8 SW |
1392 | struct ceph_mds_session *session) |
1393 | { | |
3d14c5d2 | 1394 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
a8599bd8 | 1395 | struct ceph_inode_info *ci = ceph_inode(inode); |
cdc35f96 | 1396 | int flushing; |
50b885b9 | 1397 | |
cdc35f96 | 1398 | BUG_ON(ci->i_dirty_caps == 0); |
a8599bd8 | 1399 | BUG_ON(list_empty(&ci->i_dirty_item)); |
cdc35f96 SW |
1400 | |
1401 | flushing = ci->i_dirty_caps; | |
1402 | dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n", | |
1403 | ceph_cap_string(flushing), | |
1404 | ceph_cap_string(ci->i_flushing_caps), | |
1405 | ceph_cap_string(ci->i_flushing_caps | flushing)); | |
1406 | ci->i_flushing_caps |= flushing; | |
1407 | ci->i_dirty_caps = 0; | |
afcdaea3 | 1408 | dout(" inode %p now !dirty\n", inode); |
cdc35f96 | 1409 | |
a8599bd8 | 1410 | spin_lock(&mdsc->cap_dirty_lock); |
afcdaea3 SW |
1411 | list_del_init(&ci->i_dirty_item); |
1412 | ||
1413 | ci->i_cap_flush_seq = ++mdsc->cap_flush_seq; | |
a8599bd8 SW |
1414 | if (list_empty(&ci->i_flushing_item)) { |
1415 | list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); | |
1416 | mdsc->num_cap_flushing++; | |
afcdaea3 SW |
1417 | dout(" inode %p now flushing seq %lld\n", inode, |
1418 | ci->i_cap_flush_seq); | |
1419 | } else { | |
1420 | list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); | |
1421 | dout(" inode %p now flushing (more) seq %lld\n", inode, | |
a8599bd8 SW |
1422 | ci->i_cap_flush_seq); |
1423 | } | |
1424 | spin_unlock(&mdsc->cap_dirty_lock); | |
cdc35f96 SW |
1425 | |
1426 | return flushing; | |
a8599bd8 SW |
1427 | } |
1428 | ||
5ecad6fd SW |
1429 | /* |
1430 | * try to invalidate mapping pages without blocking. | |
1431 | */ | |
5ecad6fd SW |
1432 | static int try_nonblocking_invalidate(struct inode *inode) |
1433 | { | |
1434 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1435 | u32 invalidating_gen = ci->i_rdcache_gen; | |
1436 | ||
be655596 | 1437 | spin_unlock(&ci->i_ceph_lock); |
5ecad6fd | 1438 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
be655596 | 1439 | spin_lock(&ci->i_ceph_lock); |
5ecad6fd | 1440 | |
18a38193 | 1441 | if (inode->i_data.nrpages == 0 && |
5ecad6fd SW |
1442 | invalidating_gen == ci->i_rdcache_gen) { |
1443 | /* success. */ | |
1444 | dout("try_nonblocking_invalidate %p success\n", inode); | |
cd045cb4 SW |
1445 | /* save any racing async invalidate some trouble */ |
1446 | ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; | |
5ecad6fd SW |
1447 | return 0; |
1448 | } | |
1449 | dout("try_nonblocking_invalidate %p failed\n", inode); | |
1450 | return -1; | |
1451 | } | |
1452 | ||
a8599bd8 SW |
1453 | /* |
1454 | * Swiss army knife function to examine currently used and wanted | |
1455 | * versus held caps. Release, flush, ack revoked caps to mds as | |
1456 | * appropriate. | |
1457 | * | |
1458 | * CHECK_CAPS_NODELAY - caller is delayed work and we should not delay | |
1459 | * cap release further. | |
1460 | * CHECK_CAPS_AUTHONLY - we should only check the auth cap | |
1461 | * CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without | |
1462 | * further delay. | |
1463 | */ | |
1464 | void ceph_check_caps(struct ceph_inode_info *ci, int flags, | |
1465 | struct ceph_mds_session *session) | |
1466 | { | |
3d14c5d2 YS |
1467 | struct ceph_fs_client *fsc = ceph_inode_to_client(&ci->vfs_inode); |
1468 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
a8599bd8 SW |
1469 | struct inode *inode = &ci->vfs_inode; |
1470 | struct ceph_cap *cap; | |
1471 | int file_wanted, used; | |
1472 | int took_snap_rwsem = 0; /* true if mdsc->snap_rwsem held */ | |
cbd03635 | 1473 | int issued, implemented, want, retain, revoking, flushing = 0; |
a8599bd8 SW |
1474 | int mds = -1; /* keep track of how far we've gone through i_caps list |
1475 | to avoid an infinite loop on retry */ | |
1476 | struct rb_node *p; | |
1477 | int tried_invalidate = 0; | |
1478 | int delayed = 0, sent = 0, force_requeue = 0, num; | |
cbd03635 | 1479 | int queue_invalidate = 0; |
a8599bd8 SW |
1480 | int is_delayed = flags & CHECK_CAPS_NODELAY; |
1481 | ||
1482 | /* if we are unmounting, flush any unused caps immediately. */ | |
1483 | if (mdsc->stopping) | |
1484 | is_delayed = 1; | |
1485 | ||
be655596 | 1486 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1487 | |
1488 | if (ci->i_ceph_flags & CEPH_I_FLUSH) | |
1489 | flags |= CHECK_CAPS_FLUSH; | |
1490 | ||
1491 | /* flush snaps first time around only */ | |
1492 | if (!list_empty(&ci->i_cap_snaps)) | |
e835124c | 1493 | __ceph_flush_snaps(ci, &session, 0); |
a8599bd8 SW |
1494 | goto retry_locked; |
1495 | retry: | |
be655596 | 1496 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1497 | retry_locked: |
1498 | file_wanted = __ceph_caps_file_wanted(ci); | |
1499 | used = __ceph_caps_used(ci); | |
1500 | want = file_wanted | used; | |
cbd03635 SW |
1501 | issued = __ceph_caps_issued(ci, &implemented); |
1502 | revoking = implemented & ~issued; | |
a8599bd8 SW |
1503 | |
1504 | retain = want | CEPH_CAP_PIN; | |
1505 | if (!mdsc->stopping && inode->i_nlink > 0) { | |
1506 | if (want) { | |
1507 | retain |= CEPH_CAP_ANY; /* be greedy */ | |
1508 | } else { | |
1509 | retain |= CEPH_CAP_ANY_SHARED; | |
1510 | /* | |
1511 | * keep RD only if we didn't have the file open RW, | |
1512 | * because then the mds would revoke it anyway to | |
1513 | * journal max_size=0. | |
1514 | */ | |
1515 | if (ci->i_max_size == 0) | |
1516 | retain |= CEPH_CAP_ANY_RD; | |
1517 | } | |
1518 | } | |
1519 | ||
1520 | dout("check_caps %p file_want %s used %s dirty %s flushing %s" | |
cbd03635 | 1521 | " issued %s revoking %s retain %s %s%s%s\n", inode, |
a8599bd8 SW |
1522 | ceph_cap_string(file_wanted), |
1523 | ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), | |
1524 | ceph_cap_string(ci->i_flushing_caps), | |
cbd03635 | 1525 | ceph_cap_string(issued), ceph_cap_string(revoking), |
a8599bd8 SW |
1526 | ceph_cap_string(retain), |
1527 | (flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", | |
1528 | (flags & CHECK_CAPS_NODELAY) ? " NODELAY" : "", | |
1529 | (flags & CHECK_CAPS_FLUSH) ? " FLUSH" : ""); | |
1530 | ||
1531 | /* | |
1532 | * If we no longer need to hold onto old our caps, and we may | |
1533 | * have cached pages, but don't want them, then try to invalidate. | |
1534 | * If we fail, it's because pages are locked.... try again later. | |
1535 | */ | |
1536 | if ((!is_delayed || mdsc->stopping) && | |
1537 | ci->i_wrbuffer_ref == 0 && /* no dirty pages... */ | |
93afd449 | 1538 | inode->i_data.nrpages && /* have cached pages */ |
cbd03635 | 1539 | (file_wanted == 0 || /* no open files */ |
2962507c SW |
1540 | (revoking & (CEPH_CAP_FILE_CACHE| |
1541 | CEPH_CAP_FILE_LAZYIO))) && /* or revoking cache */ | |
a8599bd8 | 1542 | !tried_invalidate) { |
a8599bd8 | 1543 | dout("check_caps trying to invalidate on %p\n", inode); |
5ecad6fd | 1544 | if (try_nonblocking_invalidate(inode) < 0) { |
2962507c SW |
1545 | if (revoking & (CEPH_CAP_FILE_CACHE| |
1546 | CEPH_CAP_FILE_LAZYIO)) { | |
5ecad6fd SW |
1547 | dout("check_caps queuing invalidate\n"); |
1548 | queue_invalidate = 1; | |
1549 | ci->i_rdcache_revoking = ci->i_rdcache_gen; | |
1550 | } else { | |
1551 | dout("check_caps failed to invalidate pages\n"); | |
1552 | /* we failed to invalidate pages. check these | |
1553 | caps again later. */ | |
1554 | force_requeue = 1; | |
1555 | __cap_set_timeouts(mdsc, ci); | |
1556 | } | |
a8599bd8 SW |
1557 | } |
1558 | tried_invalidate = 1; | |
1559 | goto retry_locked; | |
1560 | } | |
1561 | ||
1562 | num = 0; | |
1563 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
1564 | cap = rb_entry(p, struct ceph_cap, ci_node); | |
1565 | num++; | |
1566 | ||
1567 | /* avoid looping forever */ | |
1568 | if (mds >= cap->mds || | |
1569 | ((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) | |
1570 | continue; | |
1571 | ||
1572 | /* NOTE: no side-effects allowed, until we take s_mutex */ | |
1573 | ||
1574 | revoking = cap->implemented & ~cap->issued; | |
088b3f5e SW |
1575 | dout(" mds%d cap %p issued %s implemented %s revoking %s\n", |
1576 | cap->mds, cap, ceph_cap_string(cap->issued), | |
1577 | ceph_cap_string(cap->implemented), | |
1578 | ceph_cap_string(revoking)); | |
a8599bd8 SW |
1579 | |
1580 | if (cap == ci->i_auth_cap && | |
1581 | (cap->issued & CEPH_CAP_FILE_WR)) { | |
1582 | /* request larger max_size from MDS? */ | |
1583 | if (ci->i_wanted_max_size > ci->i_max_size && | |
1584 | ci->i_wanted_max_size > ci->i_requested_max_size) { | |
1585 | dout("requesting new max_size\n"); | |
1586 | goto ack; | |
1587 | } | |
1588 | ||
1589 | /* approaching file_max? */ | |
1590 | if ((inode->i_size << 1) >= ci->i_max_size && | |
1591 | (ci->i_reported_size << 1) < ci->i_max_size) { | |
1592 | dout("i_size approaching max_size\n"); | |
1593 | goto ack; | |
1594 | } | |
1595 | } | |
1596 | /* flush anything dirty? */ | |
1597 | if (cap == ci->i_auth_cap && (flags & CHECK_CAPS_FLUSH) && | |
1598 | ci->i_dirty_caps) { | |
1599 | dout("flushing dirty caps\n"); | |
1600 | goto ack; | |
1601 | } | |
1602 | ||
1603 | /* completed revocation? going down and there are no caps? */ | |
1604 | if (revoking && (revoking & used) == 0) { | |
1605 | dout("completed revocation of %s\n", | |
1606 | ceph_cap_string(cap->implemented & ~cap->issued)); | |
1607 | goto ack; | |
1608 | } | |
1609 | ||
1610 | /* want more caps from mds? */ | |
1611 | if (want & ~(cap->mds_wanted | cap->issued)) | |
1612 | goto ack; | |
1613 | ||
1614 | /* things we might delay */ | |
1615 | if ((cap->issued & ~retain) == 0 && | |
1616 | cap->mds_wanted == want) | |
1617 | continue; /* nope, all good */ | |
1618 | ||
1619 | if (is_delayed) | |
1620 | goto ack; | |
1621 | ||
1622 | /* delay? */ | |
1623 | if ((ci->i_ceph_flags & CEPH_I_NODELAY) == 0 && | |
1624 | time_before(jiffies, ci->i_hold_caps_max)) { | |
1625 | dout(" delaying issued %s -> %s, wanted %s -> %s\n", | |
1626 | ceph_cap_string(cap->issued), | |
1627 | ceph_cap_string(cap->issued & retain), | |
1628 | ceph_cap_string(cap->mds_wanted), | |
1629 | ceph_cap_string(want)); | |
1630 | delayed++; | |
1631 | continue; | |
1632 | } | |
1633 | ||
1634 | ack: | |
e9964c10 SW |
1635 | if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { |
1636 | dout(" skipping %p I_NOFLUSH set\n", inode); | |
1637 | continue; | |
1638 | } | |
1639 | ||
a8599bd8 SW |
1640 | if (session && session != cap->session) { |
1641 | dout("oops, wrong session %p mutex\n", session); | |
1642 | mutex_unlock(&session->s_mutex); | |
1643 | session = NULL; | |
1644 | } | |
1645 | if (!session) { | |
1646 | session = cap->session; | |
1647 | if (mutex_trylock(&session->s_mutex) == 0) { | |
1648 | dout("inverting session/ino locks on %p\n", | |
1649 | session); | |
be655596 | 1650 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1651 | if (took_snap_rwsem) { |
1652 | up_read(&mdsc->snap_rwsem); | |
1653 | took_snap_rwsem = 0; | |
1654 | } | |
1655 | mutex_lock(&session->s_mutex); | |
1656 | goto retry; | |
1657 | } | |
1658 | } | |
1659 | /* take snap_rwsem after session mutex */ | |
1660 | if (!took_snap_rwsem) { | |
1661 | if (down_read_trylock(&mdsc->snap_rwsem) == 0) { | |
1662 | dout("inverting snap/in locks on %p\n", | |
1663 | inode); | |
be655596 | 1664 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1665 | down_read(&mdsc->snap_rwsem); |
1666 | took_snap_rwsem = 1; | |
1667 | goto retry; | |
1668 | } | |
1669 | took_snap_rwsem = 1; | |
1670 | } | |
1671 | ||
cdc35f96 SW |
1672 | if (cap == ci->i_auth_cap && ci->i_dirty_caps) |
1673 | flushing = __mark_caps_flushing(inode, session); | |
24be0c48 SW |
1674 | else |
1675 | flushing = 0; | |
a8599bd8 SW |
1676 | |
1677 | mds = cap->mds; /* remember mds, so we don't repeat */ | |
1678 | sent++; | |
1679 | ||
be655596 | 1680 | /* __send_cap drops i_ceph_lock */ |
a8599bd8 SW |
1681 | delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want, |
1682 | retain, flushing, NULL); | |
be655596 | 1683 | goto retry; /* retake i_ceph_lock and restart our cap scan. */ |
a8599bd8 SW |
1684 | } |
1685 | ||
1686 | /* | |
1687 | * Reschedule delayed caps release if we delayed anything, | |
1688 | * otherwise cancel. | |
1689 | */ | |
1690 | if (delayed && is_delayed) | |
1691 | force_requeue = 1; /* __send_cap delayed release; requeue */ | |
1692 | if (!delayed && !is_delayed) | |
1693 | __cap_delay_cancel(mdsc, ci); | |
1694 | else if (!is_delayed || force_requeue) | |
1695 | __cap_delay_requeue(mdsc, ci); | |
1696 | ||
be655596 | 1697 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 | 1698 | |
cbd03635 | 1699 | if (queue_invalidate) |
3c6f6b79 | 1700 | ceph_queue_invalidate(inode); |
cbd03635 | 1701 | |
cdc2ce05 | 1702 | if (session) |
a8599bd8 SW |
1703 | mutex_unlock(&session->s_mutex); |
1704 | if (took_snap_rwsem) | |
1705 | up_read(&mdsc->snap_rwsem); | |
1706 | } | |
1707 | ||
a8599bd8 SW |
1708 | /* |
1709 | * Try to flush dirty caps back to the auth mds. | |
1710 | */ | |
1711 | static int try_flush_caps(struct inode *inode, struct ceph_mds_session *session, | |
1712 | unsigned *flush_tid) | |
1713 | { | |
3d14c5d2 | 1714 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
a8599bd8 SW |
1715 | struct ceph_inode_info *ci = ceph_inode(inode); |
1716 | int unlock_session = session ? 0 : 1; | |
1717 | int flushing = 0; | |
1718 | ||
1719 | retry: | |
be655596 | 1720 | spin_lock(&ci->i_ceph_lock); |
e9964c10 SW |
1721 | if (ci->i_ceph_flags & CEPH_I_NOFLUSH) { |
1722 | dout("try_flush_caps skipping %p I_NOFLUSH set\n", inode); | |
1723 | goto out; | |
1724 | } | |
a8599bd8 SW |
1725 | if (ci->i_dirty_caps && ci->i_auth_cap) { |
1726 | struct ceph_cap *cap = ci->i_auth_cap; | |
1727 | int used = __ceph_caps_used(ci); | |
1728 | int want = __ceph_caps_wanted(ci); | |
1729 | int delayed; | |
1730 | ||
1731 | if (!session) { | |
be655596 | 1732 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1733 | session = cap->session; |
1734 | mutex_lock(&session->s_mutex); | |
1735 | goto retry; | |
1736 | } | |
1737 | BUG_ON(session != cap->session); | |
1738 | if (cap->session->s_state < CEPH_MDS_SESSION_OPEN) | |
1739 | goto out; | |
1740 | ||
cdc35f96 | 1741 | flushing = __mark_caps_flushing(inode, session); |
a8599bd8 | 1742 | |
be655596 | 1743 | /* __send_cap drops i_ceph_lock */ |
a8599bd8 SW |
1744 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, used, want, |
1745 | cap->issued | cap->implemented, flushing, | |
1746 | flush_tid); | |
1747 | if (!delayed) | |
1748 | goto out_unlocked; | |
1749 | ||
be655596 | 1750 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1751 | __cap_delay_requeue(mdsc, ci); |
1752 | } | |
1753 | out: | |
be655596 | 1754 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1755 | out_unlocked: |
1756 | if (session && unlock_session) | |
1757 | mutex_unlock(&session->s_mutex); | |
1758 | return flushing; | |
1759 | } | |
1760 | ||
1761 | /* | |
1762 | * Return true if we've flushed caps through the given flush_tid. | |
1763 | */ | |
1764 | static int caps_are_flushed(struct inode *inode, unsigned tid) | |
1765 | { | |
1766 | struct ceph_inode_info *ci = ceph_inode(inode); | |
a5ee751c | 1767 | int i, ret = 1; |
a8599bd8 | 1768 | |
be655596 | 1769 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1770 | for (i = 0; i < CEPH_CAP_BITS; i++) |
1771 | if ((ci->i_flushing_caps & (1 << i)) && | |
1772 | ci->i_cap_flush_tid[i] <= tid) { | |
1773 | /* still flushing this bit */ | |
1774 | ret = 0; | |
1775 | break; | |
1776 | } | |
be655596 | 1777 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1778 | return ret; |
1779 | } | |
1780 | ||
1781 | /* | |
1782 | * Wait on any unsafe replies for the given inode. First wait on the | |
1783 | * newest request, and make that the upper bound. Then, if there are | |
1784 | * more requests, keep waiting on the oldest as long as it is still older | |
1785 | * than the original request. | |
1786 | */ | |
1787 | static void sync_write_wait(struct inode *inode) | |
1788 | { | |
1789 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1790 | struct list_head *head = &ci->i_unsafe_writes; | |
1791 | struct ceph_osd_request *req; | |
1792 | u64 last_tid; | |
1793 | ||
1794 | spin_lock(&ci->i_unsafe_lock); | |
1795 | if (list_empty(head)) | |
1796 | goto out; | |
1797 | ||
1798 | /* set upper bound as _last_ entry in chain */ | |
1799 | req = list_entry(head->prev, struct ceph_osd_request, | |
1800 | r_unsafe_item); | |
1801 | last_tid = req->r_tid; | |
1802 | ||
1803 | do { | |
1804 | ceph_osdc_get_request(req); | |
1805 | spin_unlock(&ci->i_unsafe_lock); | |
1806 | dout("sync_write_wait on tid %llu (until %llu)\n", | |
1807 | req->r_tid, last_tid); | |
1808 | wait_for_completion(&req->r_safe_completion); | |
1809 | spin_lock(&ci->i_unsafe_lock); | |
1810 | ceph_osdc_put_request(req); | |
1811 | ||
1812 | /* | |
1813 | * from here on look at first entry in chain, since we | |
1814 | * only want to wait for anything older than last_tid | |
1815 | */ | |
1816 | if (list_empty(head)) | |
1817 | break; | |
1818 | req = list_entry(head->next, struct ceph_osd_request, | |
1819 | r_unsafe_item); | |
1820 | } while (req->r_tid < last_tid); | |
1821 | out: | |
1822 | spin_unlock(&ci->i_unsafe_lock); | |
1823 | } | |
1824 | ||
02c24a82 | 1825 | int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
a8599bd8 | 1826 | { |
7ea80859 | 1827 | struct inode *inode = file->f_mapping->host; |
a8599bd8 SW |
1828 | struct ceph_inode_info *ci = ceph_inode(inode); |
1829 | unsigned flush_tid; | |
1830 | int ret; | |
1831 | int dirty; | |
1832 | ||
1833 | dout("fsync %p%s\n", inode, datasync ? " datasync" : ""); | |
1834 | sync_write_wait(inode); | |
1835 | ||
02c24a82 | 1836 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
a8599bd8 SW |
1837 | if (ret < 0) |
1838 | return ret; | |
02c24a82 | 1839 | mutex_lock(&inode->i_mutex); |
a8599bd8 SW |
1840 | |
1841 | dirty = try_flush_caps(inode, NULL, &flush_tid); | |
1842 | dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); | |
1843 | ||
1844 | /* | |
1845 | * only wait on non-file metadata writeback (the mds | |
1846 | * can recover size and mtime, so we don't need to | |
1847 | * wait for that) | |
1848 | */ | |
1849 | if (!datasync && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { | |
1850 | dout("fsync waiting for flush_tid %u\n", flush_tid); | |
1851 | ret = wait_event_interruptible(ci->i_cap_wq, | |
1852 | caps_are_flushed(inode, flush_tid)); | |
1853 | } | |
1854 | ||
1855 | dout("fsync %p%s done\n", inode, datasync ? " datasync" : ""); | |
02c24a82 | 1856 | mutex_unlock(&inode->i_mutex); |
a8599bd8 SW |
1857 | return ret; |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Flush any dirty caps back to the mds. If we aren't asked to wait, | |
1862 | * queue inode for flush but don't do so immediately, because we can | |
1863 | * get by with fewer MDS messages if we wait for data writeback to | |
1864 | * complete first. | |
1865 | */ | |
f1a3d572 | 1866 | int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) |
a8599bd8 SW |
1867 | { |
1868 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1869 | unsigned flush_tid; | |
1870 | int err = 0; | |
1871 | int dirty; | |
f1a3d572 | 1872 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
a8599bd8 SW |
1873 | |
1874 | dout("write_inode %p wait=%d\n", inode, wait); | |
1875 | if (wait) { | |
1876 | dirty = try_flush_caps(inode, NULL, &flush_tid); | |
1877 | if (dirty) | |
1878 | err = wait_event_interruptible(ci->i_cap_wq, | |
1879 | caps_are_flushed(inode, flush_tid)); | |
1880 | } else { | |
640ef79d | 1881 | struct ceph_mds_client *mdsc = |
3d14c5d2 | 1882 | ceph_sb_to_client(inode->i_sb)->mdsc; |
a8599bd8 | 1883 | |
be655596 | 1884 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1885 | if (__ceph_caps_dirty(ci)) |
1886 | __cap_delay_requeue_front(mdsc, ci); | |
be655596 | 1887 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1888 | } |
1889 | return err; | |
1890 | } | |
1891 | ||
1892 | /* | |
1893 | * After a recovering MDS goes active, we need to resend any caps | |
1894 | * we were flushing. | |
1895 | * | |
1896 | * Caller holds session->s_mutex. | |
1897 | */ | |
1898 | static void kick_flushing_capsnaps(struct ceph_mds_client *mdsc, | |
1899 | struct ceph_mds_session *session) | |
1900 | { | |
1901 | struct ceph_cap_snap *capsnap; | |
1902 | ||
1903 | dout("kick_flushing_capsnaps mds%d\n", session->s_mds); | |
1904 | list_for_each_entry(capsnap, &session->s_cap_snaps_flushing, | |
1905 | flushing_item) { | |
1906 | struct ceph_inode_info *ci = capsnap->ci; | |
1907 | struct inode *inode = &ci->vfs_inode; | |
1908 | struct ceph_cap *cap; | |
1909 | ||
be655596 | 1910 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1911 | cap = ci->i_auth_cap; |
1912 | if (cap && cap->session == session) { | |
1913 | dout("kick_flushing_caps %p cap %p capsnap %p\n", inode, | |
1914 | cap, capsnap); | |
e835124c | 1915 | __ceph_flush_snaps(ci, &session, 1); |
a8599bd8 SW |
1916 | } else { |
1917 | pr_err("%p auth cap %p not mds%d ???\n", inode, | |
1918 | cap, session->s_mds); | |
a8599bd8 | 1919 | } |
be655596 | 1920 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1921 | } |
1922 | } | |
1923 | ||
1924 | void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, | |
1925 | struct ceph_mds_session *session) | |
1926 | { | |
1927 | struct ceph_inode_info *ci; | |
1928 | ||
1929 | kick_flushing_capsnaps(mdsc, session); | |
1930 | ||
1931 | dout("kick_flushing_caps mds%d\n", session->s_mds); | |
1932 | list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { | |
1933 | struct inode *inode = &ci->vfs_inode; | |
1934 | struct ceph_cap *cap; | |
1935 | int delayed = 0; | |
1936 | ||
be655596 | 1937 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
1938 | cap = ci->i_auth_cap; |
1939 | if (cap && cap->session == session) { | |
1940 | dout("kick_flushing_caps %p cap %p %s\n", inode, | |
1941 | cap, ceph_cap_string(ci->i_flushing_caps)); | |
1942 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, | |
1943 | __ceph_caps_used(ci), | |
1944 | __ceph_caps_wanted(ci), | |
1945 | cap->issued | cap->implemented, | |
1946 | ci->i_flushing_caps, NULL); | |
1947 | if (delayed) { | |
be655596 | 1948 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 | 1949 | __cap_delay_requeue(mdsc, ci); |
be655596 | 1950 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1951 | } |
1952 | } else { | |
1953 | pr_err("%p auth cap %p not mds%d ???\n", inode, | |
1954 | cap, session->s_mds); | |
be655596 | 1955 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
1956 | } |
1957 | } | |
1958 | } | |
1959 | ||
088b3f5e SW |
1960 | static void kick_flushing_inode_caps(struct ceph_mds_client *mdsc, |
1961 | struct ceph_mds_session *session, | |
1962 | struct inode *inode) | |
1963 | { | |
1964 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1965 | struct ceph_cap *cap; | |
1966 | int delayed = 0; | |
1967 | ||
be655596 | 1968 | spin_lock(&ci->i_ceph_lock); |
088b3f5e SW |
1969 | cap = ci->i_auth_cap; |
1970 | dout("kick_flushing_inode_caps %p flushing %s flush_seq %lld\n", inode, | |
1971 | ceph_cap_string(ci->i_flushing_caps), ci->i_cap_flush_seq); | |
1972 | __ceph_flush_snaps(ci, &session, 1); | |
1973 | if (ci->i_flushing_caps) { | |
1974 | delayed = __send_cap(mdsc, cap, CEPH_CAP_OP_FLUSH, | |
1975 | __ceph_caps_used(ci), | |
1976 | __ceph_caps_wanted(ci), | |
1977 | cap->issued | cap->implemented, | |
1978 | ci->i_flushing_caps, NULL); | |
1979 | if (delayed) { | |
be655596 | 1980 | spin_lock(&ci->i_ceph_lock); |
088b3f5e | 1981 | __cap_delay_requeue(mdsc, ci); |
be655596 | 1982 | spin_unlock(&ci->i_ceph_lock); |
088b3f5e SW |
1983 | } |
1984 | } else { | |
be655596 | 1985 | spin_unlock(&ci->i_ceph_lock); |
088b3f5e SW |
1986 | } |
1987 | } | |
1988 | ||
a8599bd8 SW |
1989 | |
1990 | /* | |
1991 | * Take references to capabilities we hold, so that we don't release | |
1992 | * them to the MDS prematurely. | |
1993 | * | |
be655596 | 1994 | * Protected by i_ceph_lock. |
a8599bd8 SW |
1995 | */ |
1996 | static void __take_cap_refs(struct ceph_inode_info *ci, int got) | |
1997 | { | |
1998 | if (got & CEPH_CAP_PIN) | |
1999 | ci->i_pin_ref++; | |
2000 | if (got & CEPH_CAP_FILE_RD) | |
2001 | ci->i_rd_ref++; | |
2002 | if (got & CEPH_CAP_FILE_CACHE) | |
2003 | ci->i_rdcache_ref++; | |
2004 | if (got & CEPH_CAP_FILE_WR) | |
2005 | ci->i_wr_ref++; | |
2006 | if (got & CEPH_CAP_FILE_BUFFER) { | |
d3d0720d | 2007 | if (ci->i_wb_ref == 0) |
3772d26d | 2008 | ihold(&ci->vfs_inode); |
d3d0720d HC |
2009 | ci->i_wb_ref++; |
2010 | dout("__take_cap_refs %p wb %d -> %d (?)\n", | |
2011 | &ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref); | |
a8599bd8 SW |
2012 | } |
2013 | } | |
2014 | ||
2015 | /* | |
2016 | * Try to grab cap references. Specify those refs we @want, and the | |
2017 | * minimal set we @need. Also include the larger offset we are writing | |
2018 | * to (when applicable), and check against max_size here as well. | |
2019 | * Note that caller is responsible for ensuring max_size increases are | |
2020 | * requested from the MDS. | |
2021 | */ | |
2022 | static int try_get_cap_refs(struct ceph_inode_info *ci, int need, int want, | |
2023 | int *got, loff_t endoff, int *check_max, int *err) | |
2024 | { | |
2025 | struct inode *inode = &ci->vfs_inode; | |
2026 | int ret = 0; | |
2027 | int have, implemented; | |
195d3ce2 | 2028 | int file_wanted; |
a8599bd8 SW |
2029 | |
2030 | dout("get_cap_refs %p need %s want %s\n", inode, | |
2031 | ceph_cap_string(need), ceph_cap_string(want)); | |
be655596 | 2032 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 | 2033 | |
195d3ce2 SW |
2034 | /* make sure file is actually open */ |
2035 | file_wanted = __ceph_caps_file_wanted(ci); | |
2036 | if ((file_wanted & need) == 0) { | |
2037 | dout("try_get_cap_refs need %s file_wanted %s, EBADF\n", | |
2038 | ceph_cap_string(need), ceph_cap_string(file_wanted)); | |
a8599bd8 SW |
2039 | *err = -EBADF; |
2040 | ret = 1; | |
2041 | goto out; | |
2042 | } | |
2043 | ||
2044 | if (need & CEPH_CAP_FILE_WR) { | |
2045 | if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { | |
2046 | dout("get_cap_refs %p endoff %llu > maxsize %llu\n", | |
2047 | inode, endoff, ci->i_max_size); | |
2048 | if (endoff > ci->i_wanted_max_size) { | |
2049 | *check_max = 1; | |
2050 | ret = 1; | |
2051 | } | |
2052 | goto out; | |
2053 | } | |
2054 | /* | |
2055 | * If a sync write is in progress, we must wait, so that we | |
2056 | * can get a final snapshot value for size+mtime. | |
2057 | */ | |
2058 | if (__ceph_have_pending_cap_snap(ci)) { | |
2059 | dout("get_cap_refs %p cap_snap_pending\n", inode); | |
2060 | goto out; | |
2061 | } | |
2062 | } | |
2063 | have = __ceph_caps_issued(ci, &implemented); | |
2064 | ||
2065 | /* | |
2066 | * disallow writes while a truncate is pending | |
2067 | */ | |
2068 | if (ci->i_truncate_pending) | |
2069 | have &= ~CEPH_CAP_FILE_WR; | |
2070 | ||
2071 | if ((have & need) == need) { | |
2072 | /* | |
2073 | * Look at (implemented & ~have & not) so that we keep waiting | |
2074 | * on transition from wanted -> needed caps. This is needed | |
2075 | * for WRBUFFER|WR -> WR to avoid a new WR sync write from | |
2076 | * going before a prior buffered writeback happens. | |
2077 | */ | |
2078 | int not = want & ~(have & need); | |
2079 | int revoking = implemented & ~have; | |
2080 | dout("get_cap_refs %p have %s but not %s (revoking %s)\n", | |
2081 | inode, ceph_cap_string(have), ceph_cap_string(not), | |
2082 | ceph_cap_string(revoking)); | |
2083 | if ((revoking & not) == 0) { | |
2084 | *got = need | (have & want); | |
2085 | __take_cap_refs(ci, *got); | |
2086 | ret = 1; | |
2087 | } | |
2088 | } else { | |
2089 | dout("get_cap_refs %p have %s needed %s\n", inode, | |
2090 | ceph_cap_string(have), ceph_cap_string(need)); | |
2091 | } | |
2092 | out: | |
be655596 | 2093 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2094 | dout("get_cap_refs %p ret %d got %s\n", inode, |
2095 | ret, ceph_cap_string(*got)); | |
2096 | return ret; | |
2097 | } | |
2098 | ||
2099 | /* | |
2100 | * Check the offset we are writing up to against our current | |
2101 | * max_size. If necessary, tell the MDS we want to write to | |
2102 | * a larger offset. | |
2103 | */ | |
2104 | static void check_max_size(struct inode *inode, loff_t endoff) | |
2105 | { | |
2106 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2107 | int check = 0; | |
2108 | ||
2109 | /* do we need to explicitly request a larger max_size? */ | |
be655596 | 2110 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2111 | if ((endoff >= ci->i_max_size || |
2112 | endoff > (inode->i_size << 1)) && | |
2113 | endoff > ci->i_wanted_max_size) { | |
2114 | dout("write %p at large endoff %llu, req max_size\n", | |
2115 | inode, endoff); | |
2116 | ci->i_wanted_max_size = endoff; | |
2117 | check = 1; | |
2118 | } | |
be655596 | 2119 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2120 | if (check) |
2121 | ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); | |
2122 | } | |
2123 | ||
2124 | /* | |
2125 | * Wait for caps, and take cap references. If we can't get a WR cap | |
2126 | * due to a small max_size, make sure we check_max_size (and possibly | |
2127 | * ask the mds) so we don't get hung up indefinitely. | |
2128 | */ | |
2129 | int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, int *got, | |
2130 | loff_t endoff) | |
2131 | { | |
2132 | int check_max, ret, err; | |
2133 | ||
2134 | retry: | |
2135 | if (endoff > 0) | |
2136 | check_max_size(&ci->vfs_inode, endoff); | |
2137 | check_max = 0; | |
2138 | err = 0; | |
2139 | ret = wait_event_interruptible(ci->i_cap_wq, | |
2140 | try_get_cap_refs(ci, need, want, | |
2141 | got, endoff, | |
2142 | &check_max, &err)); | |
2143 | if (err) | |
2144 | ret = err; | |
2145 | if (check_max) | |
2146 | goto retry; | |
2147 | return ret; | |
2148 | } | |
2149 | ||
2150 | /* | |
2151 | * Take cap refs. Caller must already know we hold at least one ref | |
2152 | * on the caps in question or we don't know this is safe. | |
2153 | */ | |
2154 | void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) | |
2155 | { | |
be655596 | 2156 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 | 2157 | __take_cap_refs(ci, caps); |
be655596 | 2158 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2159 | } |
2160 | ||
2161 | /* | |
2162 | * Release cap refs. | |
2163 | * | |
2164 | * If we released the last ref on any given cap, call ceph_check_caps | |
2165 | * to release (or schedule a release). | |
2166 | * | |
2167 | * If we are releasing a WR cap (from a sync write), finalize any affected | |
2168 | * cap_snap, and wake up any waiters. | |
2169 | */ | |
2170 | void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) | |
2171 | { | |
2172 | struct inode *inode = &ci->vfs_inode; | |
2173 | int last = 0, put = 0, flushsnaps = 0, wake = 0; | |
2174 | struct ceph_cap_snap *capsnap; | |
2175 | ||
be655596 | 2176 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2177 | if (had & CEPH_CAP_PIN) |
2178 | --ci->i_pin_ref; | |
2179 | if (had & CEPH_CAP_FILE_RD) | |
2180 | if (--ci->i_rd_ref == 0) | |
2181 | last++; | |
2182 | if (had & CEPH_CAP_FILE_CACHE) | |
2183 | if (--ci->i_rdcache_ref == 0) | |
2184 | last++; | |
2185 | if (had & CEPH_CAP_FILE_BUFFER) { | |
d3d0720d | 2186 | if (--ci->i_wb_ref == 0) { |
a8599bd8 SW |
2187 | last++; |
2188 | put++; | |
2189 | } | |
d3d0720d HC |
2190 | dout("put_cap_refs %p wb %d -> %d (?)\n", |
2191 | inode, ci->i_wb_ref+1, ci->i_wb_ref); | |
a8599bd8 SW |
2192 | } |
2193 | if (had & CEPH_CAP_FILE_WR) | |
2194 | if (--ci->i_wr_ref == 0) { | |
2195 | last++; | |
2196 | if (!list_empty(&ci->i_cap_snaps)) { | |
2197 | capsnap = list_first_entry(&ci->i_cap_snaps, | |
2198 | struct ceph_cap_snap, | |
2199 | ci_item); | |
2200 | if (capsnap->writing) { | |
2201 | capsnap->writing = 0; | |
2202 | flushsnaps = | |
2203 | __ceph_finish_cap_snap(ci, | |
2204 | capsnap); | |
2205 | wake = 1; | |
2206 | } | |
2207 | } | |
2208 | } | |
be655596 | 2209 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 | 2210 | |
819ccbfa SW |
2211 | dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had), |
2212 | last ? " last" : "", put ? " put" : ""); | |
a8599bd8 SW |
2213 | |
2214 | if (last && !flushsnaps) | |
2215 | ceph_check_caps(ci, 0, NULL); | |
2216 | else if (flushsnaps) | |
2217 | ceph_flush_snaps(ci); | |
2218 | if (wake) | |
03066f23 | 2219 | wake_up_all(&ci->i_cap_wq); |
a8599bd8 SW |
2220 | if (put) |
2221 | iput(inode); | |
2222 | } | |
2223 | ||
2224 | /* | |
2225 | * Release @nr WRBUFFER refs on dirty pages for the given @snapc snap | |
2226 | * context. Adjust per-snap dirty page accounting as appropriate. | |
2227 | * Once all dirty data for a cap_snap is flushed, flush snapped file | |
2228 | * metadata back to the MDS. If we dropped the last ref, call | |
2229 | * ceph_check_caps. | |
2230 | */ | |
2231 | void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, | |
2232 | struct ceph_snap_context *snapc) | |
2233 | { | |
2234 | struct inode *inode = &ci->vfs_inode; | |
2235 | int last = 0; | |
819ccbfa SW |
2236 | int complete_capsnap = 0; |
2237 | int drop_capsnap = 0; | |
a8599bd8 SW |
2238 | int found = 0; |
2239 | struct ceph_cap_snap *capsnap = NULL; | |
2240 | ||
be655596 | 2241 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2242 | ci->i_wrbuffer_ref -= nr; |
2243 | last = !ci->i_wrbuffer_ref; | |
2244 | ||
2245 | if (ci->i_head_snapc == snapc) { | |
2246 | ci->i_wrbuffer_ref_head -= nr; | |
7d8cb26d SW |
2247 | if (ci->i_wrbuffer_ref_head == 0 && |
2248 | ci->i_dirty_caps == 0 && ci->i_flushing_caps == 0) { | |
2249 | BUG_ON(!ci->i_head_snapc); | |
a8599bd8 SW |
2250 | ceph_put_snap_context(ci->i_head_snapc); |
2251 | ci->i_head_snapc = NULL; | |
2252 | } | |
2253 | dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n", | |
2254 | inode, | |
2255 | ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr, | |
2256 | ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, | |
2257 | last ? " LAST" : ""); | |
2258 | } else { | |
2259 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { | |
2260 | if (capsnap->context == snapc) { | |
2261 | found = 1; | |
a8599bd8 SW |
2262 | break; |
2263 | } | |
2264 | } | |
2265 | BUG_ON(!found); | |
819ccbfa SW |
2266 | capsnap->dirty_pages -= nr; |
2267 | if (capsnap->dirty_pages == 0) { | |
2268 | complete_capsnap = 1; | |
2269 | if (capsnap->dirty == 0) | |
2270 | /* cap writeback completed before we created | |
2271 | * the cap_snap; no FLUSHSNAP is needed */ | |
2272 | drop_capsnap = 1; | |
2273 | } | |
a8599bd8 | 2274 | dout("put_wrbuffer_cap_refs on %p cap_snap %p " |
819ccbfa | 2275 | " snap %lld %d/%d -> %d/%d %s%s%s\n", |
a8599bd8 SW |
2276 | inode, capsnap, capsnap->context->seq, |
2277 | ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, | |
2278 | ci->i_wrbuffer_ref, capsnap->dirty_pages, | |
2279 | last ? " (wrbuffer last)" : "", | |
819ccbfa SW |
2280 | complete_capsnap ? " (complete capsnap)" : "", |
2281 | drop_capsnap ? " (drop capsnap)" : ""); | |
2282 | if (drop_capsnap) { | |
2283 | ceph_put_snap_context(capsnap->context); | |
2284 | list_del(&capsnap->ci_item); | |
2285 | list_del(&capsnap->flushing_item); | |
2286 | ceph_put_cap_snap(capsnap); | |
2287 | } | |
a8599bd8 SW |
2288 | } |
2289 | ||
be655596 | 2290 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2291 | |
2292 | if (last) { | |
2293 | ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); | |
2294 | iput(inode); | |
819ccbfa | 2295 | } else if (complete_capsnap) { |
a8599bd8 | 2296 | ceph_flush_snaps(ci); |
03066f23 | 2297 | wake_up_all(&ci->i_cap_wq); |
a8599bd8 | 2298 | } |
819ccbfa SW |
2299 | if (drop_capsnap) |
2300 | iput(inode); | |
a8599bd8 SW |
2301 | } |
2302 | ||
2303 | /* | |
2304 | * Handle a cap GRANT message from the MDS. (Note that a GRANT may | |
2305 | * actually be a revocation if it specifies a smaller cap set.) | |
2306 | * | |
be655596 | 2307 | * caller holds s_mutex and i_ceph_lock, we drop both. |
15637c8b | 2308 | * |
a8599bd8 SW |
2309 | * return value: |
2310 | * 0 - ok | |
2311 | * 1 - check_caps on auth cap only (writeback) | |
2312 | * 2 - check_caps (ack revoke) | |
2313 | */ | |
15637c8b SW |
2314 | static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, |
2315 | struct ceph_mds_session *session, | |
2316 | struct ceph_cap *cap, | |
2317 | struct ceph_buffer *xattr_buf) | |
be655596 | 2318 | __releases(ci->i_ceph_lock) |
a8599bd8 SW |
2319 | { |
2320 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2321 | int mds = session->s_mds; | |
2f56f56a | 2322 | int seq = le32_to_cpu(grant->seq); |
a8599bd8 SW |
2323 | int newcaps = le32_to_cpu(grant->caps); |
2324 | int issued, implemented, used, wanted, dirty; | |
2325 | u64 size = le64_to_cpu(grant->size); | |
2326 | u64 max_size = le64_to_cpu(grant->max_size); | |
2327 | struct timespec mtime, atime, ctime; | |
15637c8b | 2328 | int check_caps = 0; |
a8599bd8 SW |
2329 | int wake = 0; |
2330 | int writeback = 0; | |
2331 | int revoked_rdcache = 0; | |
3c6f6b79 | 2332 | int queue_invalidate = 0; |
a8599bd8 | 2333 | |
2f56f56a SW |
2334 | dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", |
2335 | inode, cap, mds, seq, ceph_cap_string(newcaps)); | |
a8599bd8 SW |
2336 | dout(" size %llu max_size %llu, i_size %llu\n", size, max_size, |
2337 | inode->i_size); | |
2338 | ||
2339 | /* | |
2340 | * If CACHE is being revoked, and we have no dirty buffers, | |
2341 | * try to invalidate (once). (If there are dirty buffers, we | |
2342 | * will invalidate _after_ writeback.) | |
2343 | */ | |
3b454c49 SW |
2344 | if (((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && |
2345 | (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && | |
bcd2cbd1 | 2346 | !ci->i_wrbuffer_ref) { |
5ecad6fd SW |
2347 | if (try_nonblocking_invalidate(inode) == 0) { |
2348 | revoked_rdcache = 1; | |
2349 | } else { | |
a8599bd8 SW |
2350 | /* there were locked pages.. invalidate later |
2351 | in a separate thread. */ | |
2352 | if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { | |
3c6f6b79 | 2353 | queue_invalidate = 1; |
a8599bd8 SW |
2354 | ci->i_rdcache_revoking = ci->i_rdcache_gen; |
2355 | } | |
a8599bd8 | 2356 | } |
a8599bd8 SW |
2357 | } |
2358 | ||
2359 | /* side effects now are allowed */ | |
2360 | ||
2361 | issued = __ceph_caps_issued(ci, &implemented); | |
2362 | issued |= implemented | __ceph_caps_dirty(ci); | |
2363 | ||
685f9a5d | 2364 | cap->cap_gen = session->s_cap_gen; |
a8599bd8 SW |
2365 | |
2366 | __check_cap_issue(ci, cap, newcaps); | |
2367 | ||
2368 | if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { | |
2369 | inode->i_mode = le32_to_cpu(grant->mode); | |
2370 | inode->i_uid = le32_to_cpu(grant->uid); | |
2371 | inode->i_gid = le32_to_cpu(grant->gid); | |
2372 | dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, | |
2373 | inode->i_uid, inode->i_gid); | |
2374 | } | |
2375 | ||
2376 | if ((issued & CEPH_CAP_LINK_EXCL) == 0) | |
bfe86848 | 2377 | set_nlink(inode, le32_to_cpu(grant->nlink)); |
a8599bd8 SW |
2378 | |
2379 | if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) { | |
2380 | int len = le32_to_cpu(grant->xattr_len); | |
2381 | u64 version = le64_to_cpu(grant->xattr_version); | |
2382 | ||
2383 | if (version > ci->i_xattrs.version) { | |
2384 | dout(" got new xattrs v%llu on %p len %d\n", | |
2385 | version, inode, len); | |
2386 | if (ci->i_xattrs.blob) | |
2387 | ceph_buffer_put(ci->i_xattrs.blob); | |
2388 | ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); | |
2389 | ci->i_xattrs.version = version; | |
2390 | } | |
2391 | } | |
2392 | ||
2393 | /* size/ctime/mtime/atime? */ | |
2394 | ceph_fill_file_size(inode, issued, | |
2395 | le32_to_cpu(grant->truncate_seq), | |
2396 | le64_to_cpu(grant->truncate_size), size); | |
2397 | ceph_decode_timespec(&mtime, &grant->mtime); | |
2398 | ceph_decode_timespec(&atime, &grant->atime); | |
2399 | ceph_decode_timespec(&ctime, &grant->ctime); | |
2400 | ceph_fill_file_time(inode, issued, | |
2401 | le32_to_cpu(grant->time_warp_seq), &ctime, &mtime, | |
2402 | &atime); | |
2403 | ||
2404 | /* max size increase? */ | |
5e62ad30 | 2405 | if (ci->i_auth_cap == cap && max_size != ci->i_max_size) { |
a8599bd8 SW |
2406 | dout("max_size %lld -> %llu\n", ci->i_max_size, max_size); |
2407 | ci->i_max_size = max_size; | |
2408 | if (max_size >= ci->i_wanted_max_size) { | |
2409 | ci->i_wanted_max_size = 0; /* reset */ | |
2410 | ci->i_requested_max_size = 0; | |
2411 | } | |
2412 | wake = 1; | |
2413 | } | |
2414 | ||
2415 | /* check cap bits */ | |
2416 | wanted = __ceph_caps_wanted(ci); | |
2417 | used = __ceph_caps_used(ci); | |
2418 | dirty = __ceph_caps_dirty(ci); | |
2419 | dout(" my wanted = %s, used = %s, dirty %s\n", | |
2420 | ceph_cap_string(wanted), | |
2421 | ceph_cap_string(used), | |
2422 | ceph_cap_string(dirty)); | |
2423 | if (wanted != le32_to_cpu(grant->wanted)) { | |
2424 | dout("mds wanted %s -> %s\n", | |
2425 | ceph_cap_string(le32_to_cpu(grant->wanted)), | |
2426 | ceph_cap_string(wanted)); | |
2427 | grant->wanted = cpu_to_le32(wanted); | |
2428 | } | |
2429 | ||
2430 | cap->seq = seq; | |
2431 | ||
2432 | /* file layout may have changed */ | |
2433 | ci->i_layout = grant->layout; | |
2434 | ||
2435 | /* revocation, grant, or no-op? */ | |
2436 | if (cap->issued & ~newcaps) { | |
3b454c49 SW |
2437 | int revoking = cap->issued & ~newcaps; |
2438 | ||
2439 | dout("revocation: %s -> %s (revoking %s)\n", | |
2440 | ceph_cap_string(cap->issued), | |
2441 | ceph_cap_string(newcaps), | |
2442 | ceph_cap_string(revoking)); | |
0eb6cd49 | 2443 | if (revoking & used & CEPH_CAP_FILE_BUFFER) |
3b454c49 SW |
2444 | writeback = 1; /* initiate writeback; will delay ack */ |
2445 | else if (revoking == CEPH_CAP_FILE_CACHE && | |
2446 | (newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && | |
2447 | queue_invalidate) | |
2448 | ; /* do nothing yet, invalidation will be queued */ | |
2449 | else if (cap == ci->i_auth_cap) | |
2450 | check_caps = 1; /* check auth cap only */ | |
2451 | else | |
2452 | check_caps = 2; /* check all caps */ | |
a8599bd8 | 2453 | cap->issued = newcaps; |
978097c9 | 2454 | cap->implemented |= newcaps; |
a8599bd8 SW |
2455 | } else if (cap->issued == newcaps) { |
2456 | dout("caps unchanged: %s -> %s\n", | |
2457 | ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); | |
2458 | } else { | |
2459 | dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), | |
2460 | ceph_cap_string(newcaps)); | |
2461 | cap->issued = newcaps; | |
2462 | cap->implemented |= newcaps; /* add bits only, to | |
2463 | * avoid stepping on a | |
2464 | * pending revocation */ | |
2465 | wake = 1; | |
2466 | } | |
978097c9 | 2467 | BUG_ON(cap->issued & ~cap->implemented); |
a8599bd8 | 2468 | |
be655596 | 2469 | spin_unlock(&ci->i_ceph_lock); |
3c6f6b79 | 2470 | if (writeback) |
a8599bd8 SW |
2471 | /* |
2472 | * queue inode for writeback: we can't actually call | |
2473 | * filemap_write_and_wait, etc. from message handler | |
2474 | * context. | |
2475 | */ | |
3c6f6b79 SW |
2476 | ceph_queue_writeback(inode); |
2477 | if (queue_invalidate) | |
2478 | ceph_queue_invalidate(inode); | |
a8599bd8 | 2479 | if (wake) |
03066f23 | 2480 | wake_up_all(&ci->i_cap_wq); |
15637c8b SW |
2481 | |
2482 | if (check_caps == 1) | |
2483 | ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_AUTHONLY, | |
2484 | session); | |
2485 | else if (check_caps == 2) | |
2486 | ceph_check_caps(ci, CHECK_CAPS_NODELAY, session); | |
2487 | else | |
2488 | mutex_unlock(&session->s_mutex); | |
a8599bd8 SW |
2489 | } |
2490 | ||
2491 | /* | |
2492 | * Handle FLUSH_ACK from MDS, indicating that metadata we sent to the | |
2493 | * MDS has been safely committed. | |
2494 | */ | |
6df058c0 | 2495 | static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, |
a8599bd8 SW |
2496 | struct ceph_mds_caps *m, |
2497 | struct ceph_mds_session *session, | |
2498 | struct ceph_cap *cap) | |
be655596 | 2499 | __releases(ci->i_ceph_lock) |
a8599bd8 SW |
2500 | { |
2501 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3d14c5d2 | 2502 | struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
a8599bd8 SW |
2503 | unsigned seq = le32_to_cpu(m->seq); |
2504 | int dirty = le32_to_cpu(m->dirty); | |
2505 | int cleaned = 0; | |
afcdaea3 | 2506 | int drop = 0; |
a8599bd8 SW |
2507 | int i; |
2508 | ||
2509 | for (i = 0; i < CEPH_CAP_BITS; i++) | |
2510 | if ((dirty & (1 << i)) && | |
2511 | flush_tid == ci->i_cap_flush_tid[i]) | |
2512 | cleaned |= 1 << i; | |
2513 | ||
2514 | dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s," | |
2515 | " flushing %s -> %s\n", | |
2516 | inode, session->s_mds, seq, ceph_cap_string(dirty), | |
2517 | ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps), | |
2518 | ceph_cap_string(ci->i_flushing_caps & ~cleaned)); | |
2519 | ||
2520 | if (ci->i_flushing_caps == (ci->i_flushing_caps & ~cleaned)) | |
2521 | goto out; | |
2522 | ||
a8599bd8 | 2523 | ci->i_flushing_caps &= ~cleaned; |
a8599bd8 SW |
2524 | |
2525 | spin_lock(&mdsc->cap_dirty_lock); | |
2526 | if (ci->i_flushing_caps == 0) { | |
2527 | list_del_init(&ci->i_flushing_item); | |
2528 | if (!list_empty(&session->s_cap_flushing)) | |
2529 | dout(" mds%d still flushing cap on %p\n", | |
2530 | session->s_mds, | |
2531 | &list_entry(session->s_cap_flushing.next, | |
2532 | struct ceph_inode_info, | |
2533 | i_flushing_item)->vfs_inode); | |
2534 | mdsc->num_cap_flushing--; | |
03066f23 | 2535 | wake_up_all(&mdsc->cap_flushing_wq); |
a8599bd8 | 2536 | dout(" inode %p now !flushing\n", inode); |
afcdaea3 SW |
2537 | |
2538 | if (ci->i_dirty_caps == 0) { | |
2539 | dout(" inode %p now clean\n", inode); | |
2540 | BUG_ON(!list_empty(&ci->i_dirty_item)); | |
2541 | drop = 1; | |
7d8cb26d SW |
2542 | if (ci->i_wrbuffer_ref_head == 0) { |
2543 | BUG_ON(!ci->i_head_snapc); | |
2544 | ceph_put_snap_context(ci->i_head_snapc); | |
2545 | ci->i_head_snapc = NULL; | |
2546 | } | |
76e3b390 SW |
2547 | } else { |
2548 | BUG_ON(list_empty(&ci->i_dirty_item)); | |
afcdaea3 | 2549 | } |
a8599bd8 SW |
2550 | } |
2551 | spin_unlock(&mdsc->cap_dirty_lock); | |
03066f23 | 2552 | wake_up_all(&ci->i_cap_wq); |
a8599bd8 SW |
2553 | |
2554 | out: | |
be655596 | 2555 | spin_unlock(&ci->i_ceph_lock); |
afcdaea3 | 2556 | if (drop) |
a8599bd8 SW |
2557 | iput(inode); |
2558 | } | |
2559 | ||
2560 | /* | |
2561 | * Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can | |
2562 | * throw away our cap_snap. | |
2563 | * | |
2564 | * Caller hold s_mutex. | |
2565 | */ | |
6df058c0 | 2566 | static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, |
a8599bd8 SW |
2567 | struct ceph_mds_caps *m, |
2568 | struct ceph_mds_session *session) | |
2569 | { | |
2570 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2571 | u64 follows = le64_to_cpu(m->snap_follows); | |
a8599bd8 SW |
2572 | struct ceph_cap_snap *capsnap; |
2573 | int drop = 0; | |
2574 | ||
2575 | dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n", | |
2576 | inode, ci, session->s_mds, follows); | |
2577 | ||
be655596 | 2578 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2579 | list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
2580 | if (capsnap->follows == follows) { | |
2581 | if (capsnap->flush_tid != flush_tid) { | |
2582 | dout(" cap_snap %p follows %lld tid %lld !=" | |
2583 | " %lld\n", capsnap, follows, | |
2584 | flush_tid, capsnap->flush_tid); | |
2585 | break; | |
2586 | } | |
2587 | WARN_ON(capsnap->dirty_pages || capsnap->writing); | |
819ccbfa SW |
2588 | dout(" removing %p cap_snap %p follows %lld\n", |
2589 | inode, capsnap, follows); | |
a8599bd8 SW |
2590 | ceph_put_snap_context(capsnap->context); |
2591 | list_del(&capsnap->ci_item); | |
2592 | list_del(&capsnap->flushing_item); | |
2593 | ceph_put_cap_snap(capsnap); | |
2594 | drop = 1; | |
2595 | break; | |
2596 | } else { | |
2597 | dout(" skipping cap_snap %p follows %lld\n", | |
2598 | capsnap, capsnap->follows); | |
2599 | } | |
2600 | } | |
be655596 | 2601 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2602 | if (drop) |
2603 | iput(inode); | |
2604 | } | |
2605 | ||
2606 | /* | |
2607 | * Handle TRUNC from MDS, indicating file truncation. | |
2608 | * | |
2609 | * caller hold s_mutex. | |
2610 | */ | |
2611 | static void handle_cap_trunc(struct inode *inode, | |
2612 | struct ceph_mds_caps *trunc, | |
2613 | struct ceph_mds_session *session) | |
be655596 | 2614 | __releases(ci->i_ceph_lock) |
a8599bd8 SW |
2615 | { |
2616 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2617 | int mds = session->s_mds; | |
2618 | int seq = le32_to_cpu(trunc->seq); | |
2619 | u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); | |
2620 | u64 truncate_size = le64_to_cpu(trunc->truncate_size); | |
2621 | u64 size = le64_to_cpu(trunc->size); | |
2622 | int implemented = 0; | |
2623 | int dirty = __ceph_caps_dirty(ci); | |
2624 | int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); | |
2625 | int queue_trunc = 0; | |
2626 | ||
2627 | issued |= implemented | dirty; | |
2628 | ||
2629 | dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n", | |
2630 | inode, mds, seq, truncate_size, truncate_seq); | |
2631 | queue_trunc = ceph_fill_file_size(inode, issued, | |
2632 | truncate_seq, truncate_size, size); | |
be655596 | 2633 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2634 | |
2635 | if (queue_trunc) | |
3c6f6b79 | 2636 | ceph_queue_vmtruncate(inode); |
a8599bd8 SW |
2637 | } |
2638 | ||
2639 | /* | |
2640 | * Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a | |
2641 | * different one. If we are the most recent migration we've seen (as | |
2642 | * indicated by mseq), make note of the migrating cap bits for the | |
2643 | * duration (until we see the corresponding IMPORT). | |
2644 | * | |
2645 | * caller holds s_mutex | |
2646 | */ | |
2647 | static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, | |
154f42c2 SW |
2648 | struct ceph_mds_session *session, |
2649 | int *open_target_sessions) | |
a8599bd8 | 2650 | { |
db354052 | 2651 | struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
a8599bd8 SW |
2652 | struct ceph_inode_info *ci = ceph_inode(inode); |
2653 | int mds = session->s_mds; | |
2654 | unsigned mseq = le32_to_cpu(ex->migrate_seq); | |
2655 | struct ceph_cap *cap = NULL, *t; | |
2656 | struct rb_node *p; | |
2657 | int remember = 1; | |
2658 | ||
2659 | dout("handle_cap_export inode %p ci %p mds%d mseq %d\n", | |
2660 | inode, ci, mds, mseq); | |
2661 | ||
be655596 | 2662 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2663 | |
2664 | /* make sure we haven't seen a higher mseq */ | |
2665 | for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { | |
2666 | t = rb_entry(p, struct ceph_cap, ci_node); | |
2667 | if (ceph_seq_cmp(t->mseq, mseq) > 0) { | |
2668 | dout(" higher mseq on cap from mds%d\n", | |
2669 | t->session->s_mds); | |
2670 | remember = 0; | |
2671 | } | |
2672 | if (t->session->s_mds == mds) | |
2673 | cap = t; | |
2674 | } | |
2675 | ||
2676 | if (cap) { | |
2677 | if (remember) { | |
2678 | /* make note */ | |
2679 | ci->i_cap_exporting_mds = mds; | |
2680 | ci->i_cap_exporting_mseq = mseq; | |
2681 | ci->i_cap_exporting_issued = cap->issued; | |
154f42c2 SW |
2682 | |
2683 | /* | |
2684 | * make sure we have open sessions with all possible | |
2685 | * export targets, so that we get the matching IMPORT | |
2686 | */ | |
2687 | *open_target_sessions = 1; | |
db354052 SW |
2688 | |
2689 | /* | |
2690 | * we can't flush dirty caps that we've seen the | |
2691 | * EXPORT but no IMPORT for | |
2692 | */ | |
2693 | spin_lock(&mdsc->cap_dirty_lock); | |
2694 | if (!list_empty(&ci->i_dirty_item)) { | |
2695 | dout(" moving %p to cap_dirty_migrating\n", | |
2696 | inode); | |
2697 | list_move(&ci->i_dirty_item, | |
2698 | &mdsc->cap_dirty_migrating); | |
2699 | } | |
2700 | spin_unlock(&mdsc->cap_dirty_lock); | |
a8599bd8 | 2701 | } |
7c1332b8 | 2702 | __ceph_remove_cap(cap); |
a8599bd8 | 2703 | } |
4ea0043a | 2704 | /* else, we already released it */ |
a8599bd8 | 2705 | |
be655596 | 2706 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2707 | } |
2708 | ||
2709 | /* | |
2710 | * Handle cap IMPORT. If there are temp bits from an older EXPORT, | |
2711 | * clean them up. | |
2712 | * | |
2713 | * caller holds s_mutex. | |
2714 | */ | |
2715 | static void handle_cap_import(struct ceph_mds_client *mdsc, | |
2716 | struct inode *inode, struct ceph_mds_caps *im, | |
2717 | struct ceph_mds_session *session, | |
2718 | void *snaptrace, int snaptrace_len) | |
2719 | { | |
2720 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2721 | int mds = session->s_mds; | |
2722 | unsigned issued = le32_to_cpu(im->caps); | |
2723 | unsigned wanted = le32_to_cpu(im->wanted); | |
2724 | unsigned seq = le32_to_cpu(im->seq); | |
2725 | unsigned mseq = le32_to_cpu(im->migrate_seq); | |
2726 | u64 realmino = le64_to_cpu(im->realm); | |
2727 | u64 cap_id = le64_to_cpu(im->cap_id); | |
2728 | ||
2729 | if (ci->i_cap_exporting_mds >= 0 && | |
2730 | ceph_seq_cmp(ci->i_cap_exporting_mseq, mseq) < 0) { | |
2731 | dout("handle_cap_import inode %p ci %p mds%d mseq %d" | |
2732 | " - cleared exporting from mds%d\n", | |
2733 | inode, ci, mds, mseq, | |
2734 | ci->i_cap_exporting_mds); | |
2735 | ci->i_cap_exporting_issued = 0; | |
2736 | ci->i_cap_exporting_mseq = 0; | |
2737 | ci->i_cap_exporting_mds = -1; | |
db354052 SW |
2738 | |
2739 | spin_lock(&mdsc->cap_dirty_lock); | |
2740 | if (!list_empty(&ci->i_dirty_item)) { | |
2741 | dout(" moving %p back to cap_dirty\n", inode); | |
2742 | list_move(&ci->i_dirty_item, &mdsc->cap_dirty); | |
2743 | } | |
2744 | spin_unlock(&mdsc->cap_dirty_lock); | |
a8599bd8 SW |
2745 | } else { |
2746 | dout("handle_cap_import inode %p ci %p mds%d mseq %d\n", | |
2747 | inode, ci, mds, mseq); | |
2748 | } | |
2749 | ||
2750 | down_write(&mdsc->snap_rwsem); | |
2751 | ceph_update_snap_trace(mdsc, snaptrace, snaptrace+snaptrace_len, | |
2752 | false); | |
2753 | downgrade_write(&mdsc->snap_rwsem); | |
2754 | ceph_add_cap(inode, session, cap_id, -1, | |
2755 | issued, wanted, seq, mseq, realmino, CEPH_CAP_FLAG_AUTH, | |
2756 | NULL /* no caps context */); | |
088b3f5e | 2757 | kick_flushing_inode_caps(mdsc, session, inode); |
a8599bd8 | 2758 | up_read(&mdsc->snap_rwsem); |
feb4cc9b SW |
2759 | |
2760 | /* make sure we re-request max_size, if necessary */ | |
be655596 | 2761 | spin_lock(&ci->i_ceph_lock); |
0e5e1774 | 2762 | ci->i_wanted_max_size = 0; /* reset */ |
feb4cc9b | 2763 | ci->i_requested_max_size = 0; |
be655596 | 2764 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2765 | } |
2766 | ||
2767 | /* | |
2768 | * Handle a caps message from the MDS. | |
2769 | * | |
2770 | * Identify the appropriate session, inode, and call the right handler | |
2771 | * based on the cap op. | |
2772 | */ | |
2773 | void ceph_handle_caps(struct ceph_mds_session *session, | |
2774 | struct ceph_msg *msg) | |
2775 | { | |
2776 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
3d14c5d2 | 2777 | struct super_block *sb = mdsc->fsc->sb; |
a8599bd8 | 2778 | struct inode *inode; |
be655596 | 2779 | struct ceph_inode_info *ci; |
a8599bd8 SW |
2780 | struct ceph_cap *cap; |
2781 | struct ceph_mds_caps *h; | |
2600d2dd | 2782 | int mds = session->s_mds; |
a8599bd8 | 2783 | int op; |
3d7ded4d | 2784 | u32 seq, mseq; |
a8599bd8 SW |
2785 | struct ceph_vino vino; |
2786 | u64 cap_id; | |
2787 | u64 size, max_size; | |
6df058c0 | 2788 | u64 tid; |
70edb55b | 2789 | void *snaptrace; |
ce1fbc8d SW |
2790 | size_t snaptrace_len; |
2791 | void *flock; | |
2792 | u32 flock_len; | |
154f42c2 | 2793 | int open_target_sessions = 0; |
a8599bd8 SW |
2794 | |
2795 | dout("handle_caps from mds%d\n", mds); | |
2796 | ||
2797 | /* decode */ | |
6df058c0 | 2798 | tid = le64_to_cpu(msg->hdr.tid); |
a8599bd8 SW |
2799 | if (msg->front.iov_len < sizeof(*h)) |
2800 | goto bad; | |
2801 | h = msg->front.iov_base; | |
2802 | op = le32_to_cpu(h->op); | |
2803 | vino.ino = le64_to_cpu(h->ino); | |
2804 | vino.snap = CEPH_NOSNAP; | |
2805 | cap_id = le64_to_cpu(h->cap_id); | |
2806 | seq = le32_to_cpu(h->seq); | |
3d7ded4d | 2807 | mseq = le32_to_cpu(h->migrate_seq); |
a8599bd8 SW |
2808 | size = le64_to_cpu(h->size); |
2809 | max_size = le64_to_cpu(h->max_size); | |
2810 | ||
ce1fbc8d SW |
2811 | snaptrace = h + 1; |
2812 | snaptrace_len = le32_to_cpu(h->snap_trace_len); | |
2813 | ||
2814 | if (le16_to_cpu(msg->hdr.version) >= 2) { | |
2815 | void *p, *end; | |
2816 | ||
2817 | p = snaptrace + snaptrace_len; | |
2818 | end = msg->front.iov_base + msg->front.iov_len; | |
2819 | ceph_decode_32_safe(&p, end, flock_len, bad); | |
2820 | flock = p; | |
2821 | } else { | |
2822 | flock = NULL; | |
2823 | flock_len = 0; | |
2824 | } | |
2825 | ||
a8599bd8 SW |
2826 | mutex_lock(&session->s_mutex); |
2827 | session->s_seq++; | |
2828 | dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, | |
2829 | (unsigned)seq); | |
2830 | ||
2831 | /* lookup ino */ | |
2832 | inode = ceph_find_inode(sb, vino); | |
be655596 | 2833 | ci = ceph_inode(inode); |
a8599bd8 SW |
2834 | dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino, |
2835 | vino.snap, inode); | |
2836 | if (!inode) { | |
2837 | dout(" i don't have ino %llx\n", vino.ino); | |
3d7ded4d SW |
2838 | |
2839 | if (op == CEPH_CAP_OP_IMPORT) | |
2840 | __queue_cap_release(session, vino.ino, cap_id, | |
2841 | mseq, seq); | |
21b559de | 2842 | goto flush_cap_releases; |
a8599bd8 SW |
2843 | } |
2844 | ||
2845 | /* these will work even if we don't have a cap yet */ | |
2846 | switch (op) { | |
2847 | case CEPH_CAP_OP_FLUSHSNAP_ACK: | |
6df058c0 | 2848 | handle_cap_flushsnap_ack(inode, tid, h, session); |
a8599bd8 SW |
2849 | goto done; |
2850 | ||
2851 | case CEPH_CAP_OP_EXPORT: | |
154f42c2 | 2852 | handle_cap_export(inode, h, session, &open_target_sessions); |
a8599bd8 SW |
2853 | goto done; |
2854 | ||
2855 | case CEPH_CAP_OP_IMPORT: | |
2856 | handle_cap_import(mdsc, inode, h, session, | |
ce1fbc8d | 2857 | snaptrace, snaptrace_len); |
a8599bd8 SW |
2858 | } |
2859 | ||
2860 | /* the rest require a cap */ | |
be655596 | 2861 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2862 | cap = __get_cap_for_mds(ceph_inode(inode), mds); |
2863 | if (!cap) { | |
9dbd412f | 2864 | dout(" no cap on %p ino %llx.%llx from mds%d\n", |
a8599bd8 | 2865 | inode, ceph_ino(inode), ceph_snap(inode), mds); |
be655596 | 2866 | spin_unlock(&ci->i_ceph_lock); |
21b559de | 2867 | goto flush_cap_releases; |
a8599bd8 SW |
2868 | } |
2869 | ||
be655596 | 2870 | /* note that each of these drops i_ceph_lock for us */ |
a8599bd8 SW |
2871 | switch (op) { |
2872 | case CEPH_CAP_OP_REVOKE: | |
2873 | case CEPH_CAP_OP_GRANT: | |
0e5e1774 | 2874 | case CEPH_CAP_OP_IMPORT: |
15637c8b SW |
2875 | handle_cap_grant(inode, h, session, cap, msg->middle); |
2876 | goto done_unlocked; | |
a8599bd8 SW |
2877 | |
2878 | case CEPH_CAP_OP_FLUSH_ACK: | |
6df058c0 | 2879 | handle_cap_flush_ack(inode, tid, h, session, cap); |
a8599bd8 SW |
2880 | break; |
2881 | ||
2882 | case CEPH_CAP_OP_TRUNC: | |
2883 | handle_cap_trunc(inode, h, session); | |
2884 | break; | |
2885 | ||
2886 | default: | |
be655596 | 2887 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2888 | pr_err("ceph_handle_caps: unknown cap op %d %s\n", op, |
2889 | ceph_cap_op_name(op)); | |
2890 | } | |
2891 | ||
21b559de GF |
2892 | goto done; |
2893 | ||
2894 | flush_cap_releases: | |
2895 | /* | |
2896 | * send any full release message to try to move things | |
2897 | * along for the mds (who clearly thinks we still have this | |
2898 | * cap). | |
2899 | */ | |
2900 | ceph_add_cap_releases(mdsc, session); | |
2901 | ceph_send_cap_releases(mdsc, session); | |
2902 | ||
a8599bd8 | 2903 | done: |
15637c8b SW |
2904 | mutex_unlock(&session->s_mutex); |
2905 | done_unlocked: | |
a8599bd8 SW |
2906 | if (inode) |
2907 | iput(inode); | |
154f42c2 SW |
2908 | if (open_target_sessions) |
2909 | ceph_mdsc_open_export_target_sessions(mdsc, session); | |
a8599bd8 SW |
2910 | return; |
2911 | ||
2912 | bad: | |
2913 | pr_err("ceph_handle_caps: corrupt message\n"); | |
9ec7cab1 | 2914 | ceph_msg_dump(msg); |
a8599bd8 SW |
2915 | return; |
2916 | } | |
2917 | ||
2918 | /* | |
2919 | * Delayed work handler to process end of delayed cap release LRU list. | |
2920 | */ | |
afcdaea3 | 2921 | void ceph_check_delayed_caps(struct ceph_mds_client *mdsc) |
a8599bd8 SW |
2922 | { |
2923 | struct ceph_inode_info *ci; | |
2924 | int flags = CHECK_CAPS_NODELAY; | |
2925 | ||
a8599bd8 SW |
2926 | dout("check_delayed_caps\n"); |
2927 | while (1) { | |
2928 | spin_lock(&mdsc->cap_delay_lock); | |
2929 | if (list_empty(&mdsc->cap_delay_list)) | |
2930 | break; | |
2931 | ci = list_first_entry(&mdsc->cap_delay_list, | |
2932 | struct ceph_inode_info, | |
2933 | i_cap_delay_list); | |
2934 | if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && | |
2935 | time_before(jiffies, ci->i_hold_caps_max)) | |
2936 | break; | |
2937 | list_del_init(&ci->i_cap_delay_list); | |
2938 | spin_unlock(&mdsc->cap_delay_lock); | |
2939 | dout("check_delayed_caps on %p\n", &ci->vfs_inode); | |
2940 | ceph_check_caps(ci, flags, NULL); | |
2941 | } | |
2942 | spin_unlock(&mdsc->cap_delay_lock); | |
2943 | } | |
2944 | ||
afcdaea3 SW |
2945 | /* |
2946 | * Flush all dirty caps to the mds | |
2947 | */ | |
2948 | void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) | |
2949 | { | |
db354052 SW |
2950 | struct ceph_inode_info *ci; |
2951 | struct inode *inode; | |
afcdaea3 SW |
2952 | |
2953 | dout("flush_dirty_caps\n"); | |
2954 | spin_lock(&mdsc->cap_dirty_lock); | |
db354052 SW |
2955 | while (!list_empty(&mdsc->cap_dirty)) { |
2956 | ci = list_first_entry(&mdsc->cap_dirty, struct ceph_inode_info, | |
2957 | i_dirty_item); | |
70b666c3 SW |
2958 | inode = &ci->vfs_inode; |
2959 | ihold(inode); | |
db354052 | 2960 | dout("flush_dirty_caps %p\n", inode); |
afcdaea3 | 2961 | spin_unlock(&mdsc->cap_dirty_lock); |
70b666c3 SW |
2962 | ceph_check_caps(ci, CHECK_CAPS_NODELAY|CHECK_CAPS_FLUSH, NULL); |
2963 | iput(inode); | |
afcdaea3 SW |
2964 | spin_lock(&mdsc->cap_dirty_lock); |
2965 | } | |
2966 | spin_unlock(&mdsc->cap_dirty_lock); | |
db354052 | 2967 | dout("flush_dirty_caps done\n"); |
afcdaea3 SW |
2968 | } |
2969 | ||
a8599bd8 SW |
2970 | /* |
2971 | * Drop open file reference. If we were the last open file, | |
2972 | * we may need to release capabilities to the MDS (or schedule | |
2973 | * their delayed release). | |
2974 | */ | |
2975 | void ceph_put_fmode(struct ceph_inode_info *ci, int fmode) | |
2976 | { | |
2977 | struct inode *inode = &ci->vfs_inode; | |
2978 | int last = 0; | |
2979 | ||
be655596 | 2980 | spin_lock(&ci->i_ceph_lock); |
a8599bd8 SW |
2981 | dout("put_fmode %p fmode %d %d -> %d\n", inode, fmode, |
2982 | ci->i_nr_by_mode[fmode], ci->i_nr_by_mode[fmode]-1); | |
2983 | BUG_ON(ci->i_nr_by_mode[fmode] == 0); | |
2984 | if (--ci->i_nr_by_mode[fmode] == 0) | |
2985 | last++; | |
be655596 | 2986 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
2987 | |
2988 | if (last && ci->i_vino.snap == CEPH_NOSNAP) | |
2989 | ceph_check_caps(ci, 0, NULL); | |
2990 | } | |
2991 | ||
2992 | /* | |
2993 | * Helpers for embedding cap and dentry lease releases into mds | |
2994 | * requests. | |
2995 | * | |
2996 | * @force is used by dentry_release (below) to force inclusion of a | |
2997 | * record for the directory inode, even when there aren't any caps to | |
2998 | * drop. | |
2999 | */ | |
3000 | int ceph_encode_inode_release(void **p, struct inode *inode, | |
3001 | int mds, int drop, int unless, int force) | |
3002 | { | |
3003 | struct ceph_inode_info *ci = ceph_inode(inode); | |
3004 | struct ceph_cap *cap; | |
3005 | struct ceph_mds_request_release *rel = *p; | |
ec97f88b | 3006 | int used, dirty; |
a8599bd8 | 3007 | int ret = 0; |
a8599bd8 | 3008 | |
be655596 | 3009 | spin_lock(&ci->i_ceph_lock); |
916623da | 3010 | used = __ceph_caps_used(ci); |
ec97f88b | 3011 | dirty = __ceph_caps_dirty(ci); |
916623da | 3012 | |
ec97f88b SW |
3013 | dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n", |
3014 | inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop), | |
916623da SW |
3015 | ceph_cap_string(unless)); |
3016 | ||
ec97f88b SW |
3017 | /* only drop unused, clean caps */ |
3018 | drop &= ~(used | dirty); | |
916623da | 3019 | |
a8599bd8 SW |
3020 | cap = __get_cap_for_mds(ci, mds); |
3021 | if (cap && __cap_is_valid(cap)) { | |
3022 | if (force || | |
3023 | ((cap->issued & drop) && | |
3024 | (cap->issued & unless) == 0)) { | |
3025 | if ((cap->issued & drop) && | |
3026 | (cap->issued & unless) == 0) { | |
3027 | dout("encode_inode_release %p cap %p %s -> " | |
3028 | "%s\n", inode, cap, | |
3029 | ceph_cap_string(cap->issued), | |
3030 | ceph_cap_string(cap->issued & ~drop)); | |
3031 | cap->issued &= ~drop; | |
3032 | cap->implemented &= ~drop; | |
3033 | if (ci->i_ceph_flags & CEPH_I_NODELAY) { | |
3034 | int wanted = __ceph_caps_wanted(ci); | |
3035 | dout(" wanted %s -> %s (act %s)\n", | |
3036 | ceph_cap_string(cap->mds_wanted), | |
3037 | ceph_cap_string(cap->mds_wanted & | |
3038 | ~wanted), | |
3039 | ceph_cap_string(wanted)); | |
3040 | cap->mds_wanted &= wanted; | |
3041 | } | |
3042 | } else { | |
3043 | dout("encode_inode_release %p cap %p %s" | |
3044 | " (force)\n", inode, cap, | |
3045 | ceph_cap_string(cap->issued)); | |
3046 | } | |
3047 | ||
3048 | rel->ino = cpu_to_le64(ceph_ino(inode)); | |
3049 | rel->cap_id = cpu_to_le64(cap->cap_id); | |
3050 | rel->seq = cpu_to_le32(cap->seq); | |
3051 | rel->issue_seq = cpu_to_le32(cap->issue_seq), | |
3052 | rel->mseq = cpu_to_le32(cap->mseq); | |
3053 | rel->caps = cpu_to_le32(cap->issued); | |
3054 | rel->wanted = cpu_to_le32(cap->mds_wanted); | |
3055 | rel->dname_len = 0; | |
3056 | rel->dname_seq = 0; | |
3057 | *p += sizeof(*rel); | |
3058 | ret = 1; | |
3059 | } else { | |
3060 | dout("encode_inode_release %p cap %p %s\n", | |
3061 | inode, cap, ceph_cap_string(cap->issued)); | |
3062 | } | |
3063 | } | |
be655596 | 3064 | spin_unlock(&ci->i_ceph_lock); |
a8599bd8 SW |
3065 | return ret; |
3066 | } | |
3067 | ||
3068 | int ceph_encode_dentry_release(void **p, struct dentry *dentry, | |
3069 | int mds, int drop, int unless) | |
3070 | { | |
3071 | struct inode *dir = dentry->d_parent->d_inode; | |
3072 | struct ceph_mds_request_release *rel = *p; | |
3073 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
3074 | int force = 0; | |
3075 | int ret; | |
3076 | ||
3077 | /* | |
3078 | * force an record for the directory caps if we have a dentry lease. | |
be655596 | 3079 | * this is racy (can't take i_ceph_lock and d_lock together), but it |
a8599bd8 SW |
3080 | * doesn't have to be perfect; the mds will revoke anything we don't |
3081 | * release. | |
3082 | */ | |
3083 | spin_lock(&dentry->d_lock); | |
3084 | if (di->lease_session && di->lease_session->s_mds == mds) | |
3085 | force = 1; | |
3086 | spin_unlock(&dentry->d_lock); | |
3087 | ||
3088 | ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); | |
3089 | ||
3090 | spin_lock(&dentry->d_lock); | |
3091 | if (ret && di->lease_session && di->lease_session->s_mds == mds) { | |
3092 | dout("encode_dentry_release %p mds%d seq %d\n", | |
3093 | dentry, mds, (int)di->lease_seq); | |
3094 | rel->dname_len = cpu_to_le32(dentry->d_name.len); | |
3095 | memcpy(*p, dentry->d_name.name, dentry->d_name.len); | |
3096 | *p += dentry->d_name.len; | |
3097 | rel->dname_seq = cpu_to_le32(di->lease_seq); | |
1dadcce3 | 3098 | __ceph_mdsc_drop_dentry_lease(dentry); |
a8599bd8 SW |
3099 | } |
3100 | spin_unlock(&dentry->d_lock); | |
3101 | return ret; | |
3102 | } |