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Commit | Line | Data |
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2f2dc053 SW |
1 | #include "ceph_debug.h" |
2 | ||
3 | #include <linux/wait.h> | |
5a0e3ad6 | 4 | #include <linux/slab.h> |
2f2dc053 SW |
5 | #include <linux/sched.h> |
6 | ||
7 | #include "mds_client.h" | |
8 | #include "mon_client.h" | |
9 | #include "super.h" | |
10 | #include "messenger.h" | |
11 | #include "decode.h" | |
4e7a5dcd | 12 | #include "auth.h" |
93cea5be | 13 | #include "pagelist.h" |
2f2dc053 SW |
14 | |
15 | /* | |
16 | * A cluster of MDS (metadata server) daemons is responsible for | |
17 | * managing the file system namespace (the directory hierarchy and | |
18 | * inodes) and for coordinating shared access to storage. Metadata is | |
19 | * partitioning hierarchically across a number of servers, and that | |
20 | * partition varies over time as the cluster adjusts the distribution | |
21 | * in order to balance load. | |
22 | * | |
23 | * The MDS client is primarily responsible to managing synchronous | |
24 | * metadata requests for operations like open, unlink, and so forth. | |
25 | * If there is a MDS failure, we find out about it when we (possibly | |
26 | * request and) receive a new MDS map, and can resubmit affected | |
27 | * requests. | |
28 | * | |
29 | * For the most part, though, we take advantage of a lossless | |
30 | * communications channel to the MDS, and do not need to worry about | |
31 | * timing out or resubmitting requests. | |
32 | * | |
33 | * We maintain a stateful "session" with each MDS we interact with. | |
34 | * Within each session, we sent periodic heartbeat messages to ensure | |
35 | * any capabilities or leases we have been issues remain valid. If | |
36 | * the session times out and goes stale, our leases and capabilities | |
37 | * are no longer valid. | |
38 | */ | |
39 | ||
40 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
41 | struct list_head *head); | |
42 | ||
43 | const static struct ceph_connection_operations mds_con_ops; | |
44 | ||
45 | ||
46 | /* | |
47 | * mds reply parsing | |
48 | */ | |
49 | ||
50 | /* | |
51 | * parse individual inode info | |
52 | */ | |
53 | static int parse_reply_info_in(void **p, void *end, | |
54 | struct ceph_mds_reply_info_in *info) | |
55 | { | |
56 | int err = -EIO; | |
57 | ||
58 | info->in = *p; | |
59 | *p += sizeof(struct ceph_mds_reply_inode) + | |
60 | sizeof(*info->in->fragtree.splits) * | |
61 | le32_to_cpu(info->in->fragtree.nsplits); | |
62 | ||
63 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
64 | ceph_decode_need(p, end, info->symlink_len, bad); | |
65 | info->symlink = *p; | |
66 | *p += info->symlink_len; | |
67 | ||
68 | ceph_decode_32_safe(p, end, info->xattr_len, bad); | |
69 | ceph_decode_need(p, end, info->xattr_len, bad); | |
70 | info->xattr_data = *p; | |
71 | *p += info->xattr_len; | |
72 | return 0; | |
73 | bad: | |
74 | return err; | |
75 | } | |
76 | ||
77 | /* | |
78 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
79 | * target inode. | |
80 | */ | |
81 | static int parse_reply_info_trace(void **p, void *end, | |
82 | struct ceph_mds_reply_info_parsed *info) | |
83 | { | |
84 | int err; | |
85 | ||
86 | if (info->head->is_dentry) { | |
87 | err = parse_reply_info_in(p, end, &info->diri); | |
88 | if (err < 0) | |
89 | goto out_bad; | |
90 | ||
91 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
92 | goto bad; | |
93 | info->dirfrag = *p; | |
94 | *p += sizeof(*info->dirfrag) + | |
95 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
96 | if (unlikely(*p > end)) | |
97 | goto bad; | |
98 | ||
99 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
100 | ceph_decode_need(p, end, info->dname_len, bad); | |
101 | info->dname = *p; | |
102 | *p += info->dname_len; | |
103 | info->dlease = *p; | |
104 | *p += sizeof(*info->dlease); | |
105 | } | |
106 | ||
107 | if (info->head->is_target) { | |
108 | err = parse_reply_info_in(p, end, &info->targeti); | |
109 | if (err < 0) | |
110 | goto out_bad; | |
111 | } | |
112 | ||
113 | if (unlikely(*p != end)) | |
114 | goto bad; | |
115 | return 0; | |
116 | ||
117 | bad: | |
118 | err = -EIO; | |
119 | out_bad: | |
120 | pr_err("problem parsing mds trace %d\n", err); | |
121 | return err; | |
122 | } | |
123 | ||
124 | /* | |
125 | * parse readdir results | |
126 | */ | |
127 | static int parse_reply_info_dir(void **p, void *end, | |
128 | struct ceph_mds_reply_info_parsed *info) | |
129 | { | |
130 | u32 num, i = 0; | |
131 | int err; | |
132 | ||
133 | info->dir_dir = *p; | |
134 | if (*p + sizeof(*info->dir_dir) > end) | |
135 | goto bad; | |
136 | *p += sizeof(*info->dir_dir) + | |
137 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
138 | if (*p > end) | |
139 | goto bad; | |
140 | ||
141 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
142 | num = ceph_decode_32(p); |
143 | info->dir_end = ceph_decode_8(p); | |
144 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
145 | if (num == 0) |
146 | goto done; | |
147 | ||
148 | /* alloc large array */ | |
149 | info->dir_nr = num; | |
150 | info->dir_in = kcalloc(num, sizeof(*info->dir_in) + | |
151 | sizeof(*info->dir_dname) + | |
152 | sizeof(*info->dir_dname_len) + | |
153 | sizeof(*info->dir_dlease), | |
154 | GFP_NOFS); | |
155 | if (info->dir_in == NULL) { | |
156 | err = -ENOMEM; | |
157 | goto out_bad; | |
158 | } | |
159 | info->dir_dname = (void *)(info->dir_in + num); | |
160 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
161 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
162 | ||
163 | while (num) { | |
164 | /* dentry */ | |
165 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 166 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
167 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
168 | info->dir_dname[i] = *p; | |
169 | *p += info->dir_dname_len[i]; | |
170 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
171 | info->dir_dname[i]); | |
172 | info->dir_dlease[i] = *p; | |
173 | *p += sizeof(struct ceph_mds_reply_lease); | |
174 | ||
175 | /* inode */ | |
176 | err = parse_reply_info_in(p, end, &info->dir_in[i]); | |
177 | if (err < 0) | |
178 | goto out_bad; | |
179 | i++; | |
180 | num--; | |
181 | } | |
182 | ||
183 | done: | |
184 | if (*p != end) | |
185 | goto bad; | |
186 | return 0; | |
187 | ||
188 | bad: | |
189 | err = -EIO; | |
190 | out_bad: | |
191 | pr_err("problem parsing dir contents %d\n", err); | |
192 | return err; | |
193 | } | |
194 | ||
195 | /* | |
196 | * parse entire mds reply | |
197 | */ | |
198 | static int parse_reply_info(struct ceph_msg *msg, | |
199 | struct ceph_mds_reply_info_parsed *info) | |
200 | { | |
201 | void *p, *end; | |
202 | u32 len; | |
203 | int err; | |
204 | ||
205 | info->head = msg->front.iov_base; | |
206 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
207 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
208 | ||
209 | /* trace */ | |
210 | ceph_decode_32_safe(&p, end, len, bad); | |
211 | if (len > 0) { | |
212 | err = parse_reply_info_trace(&p, p+len, info); | |
213 | if (err < 0) | |
214 | goto out_bad; | |
215 | } | |
216 | ||
217 | /* dir content */ | |
218 | ceph_decode_32_safe(&p, end, len, bad); | |
219 | if (len > 0) { | |
220 | err = parse_reply_info_dir(&p, p+len, info); | |
221 | if (err < 0) | |
222 | goto out_bad; | |
223 | } | |
224 | ||
225 | /* snap blob */ | |
226 | ceph_decode_32_safe(&p, end, len, bad); | |
227 | info->snapblob_len = len; | |
228 | info->snapblob = p; | |
229 | p += len; | |
230 | ||
231 | if (p != end) | |
232 | goto bad; | |
233 | return 0; | |
234 | ||
235 | bad: | |
236 | err = -EIO; | |
237 | out_bad: | |
238 | pr_err("mds parse_reply err %d\n", err); | |
239 | return err; | |
240 | } | |
241 | ||
242 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
243 | { | |
244 | kfree(info->dir_in); | |
245 | } | |
246 | ||
247 | ||
248 | /* | |
249 | * sessions | |
250 | */ | |
251 | static const char *session_state_name(int s) | |
252 | { | |
253 | switch (s) { | |
254 | case CEPH_MDS_SESSION_NEW: return "new"; | |
255 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
256 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
257 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
258 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 259 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
260 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
261 | default: return "???"; | |
262 | } | |
263 | } | |
264 | ||
265 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
266 | { | |
267 | if (atomic_inc_not_zero(&s->s_ref)) { | |
268 | dout("mdsc get_session %p %d -> %d\n", s, | |
269 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
270 | return s; | |
271 | } else { | |
272 | dout("mdsc get_session %p 0 -- FAIL", s); | |
273 | return NULL; | |
274 | } | |
275 | } | |
276 | ||
277 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
278 | { | |
279 | dout("mdsc put_session %p %d -> %d\n", s, | |
280 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd SW |
281 | if (atomic_dec_and_test(&s->s_ref)) { |
282 | if (s->s_authorizer) | |
283 | s->s_mdsc->client->monc.auth->ops->destroy_authorizer( | |
284 | s->s_mdsc->client->monc.auth, s->s_authorizer); | |
2f2dc053 | 285 | kfree(s); |
4e7a5dcd | 286 | } |
2f2dc053 SW |
287 | } |
288 | ||
289 | /* | |
290 | * called under mdsc->mutex | |
291 | */ | |
292 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
293 | int mds) | |
294 | { | |
295 | struct ceph_mds_session *session; | |
296 | ||
297 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
298 | return NULL; | |
299 | session = mdsc->sessions[mds]; | |
300 | dout("lookup_mds_session %p %d\n", session, | |
301 | atomic_read(&session->s_ref)); | |
302 | get_session(session); | |
303 | return session; | |
304 | } | |
305 | ||
306 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
307 | { | |
308 | if (mds >= mdsc->max_sessions) | |
309 | return false; | |
310 | return mdsc->sessions[mds]; | |
311 | } | |
312 | ||
2600d2dd SW |
313 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
314 | struct ceph_mds_session *s) | |
315 | { | |
316 | if (s->s_mds >= mdsc->max_sessions || | |
317 | mdsc->sessions[s->s_mds] != s) | |
318 | return -ENOENT; | |
319 | return 0; | |
320 | } | |
321 | ||
2f2dc053 SW |
322 | /* |
323 | * create+register a new session for given mds. | |
324 | * called under mdsc->mutex. | |
325 | */ | |
326 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
327 | int mds) | |
328 | { | |
329 | struct ceph_mds_session *s; | |
330 | ||
331 | s = kzalloc(sizeof(*s), GFP_NOFS); | |
4736b009 DC |
332 | if (!s) |
333 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
334 | s->s_mdsc = mdsc; |
335 | s->s_mds = mds; | |
336 | s->s_state = CEPH_MDS_SESSION_NEW; | |
337 | s->s_ttl = 0; | |
338 | s->s_seq = 0; | |
339 | mutex_init(&s->s_mutex); | |
340 | ||
341 | ceph_con_init(mdsc->client->msgr, &s->s_con); | |
342 | s->s_con.private = s; | |
343 | s->s_con.ops = &mds_con_ops; | |
344 | s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS; | |
345 | s->s_con.peer_name.num = cpu_to_le64(mds); | |
2f2dc053 SW |
346 | |
347 | spin_lock_init(&s->s_cap_lock); | |
348 | s->s_cap_gen = 0; | |
349 | s->s_cap_ttl = 0; | |
350 | s->s_renew_requested = 0; | |
351 | s->s_renew_seq = 0; | |
352 | INIT_LIST_HEAD(&s->s_caps); | |
353 | s->s_nr_caps = 0; | |
5dacf091 | 354 | s->s_trim_caps = 0; |
2f2dc053 SW |
355 | atomic_set(&s->s_ref, 1); |
356 | INIT_LIST_HEAD(&s->s_waiting); | |
357 | INIT_LIST_HEAD(&s->s_unsafe); | |
358 | s->s_num_cap_releases = 0; | |
7c1332b8 | 359 | s->s_cap_iterator = NULL; |
2f2dc053 SW |
360 | INIT_LIST_HEAD(&s->s_cap_releases); |
361 | INIT_LIST_HEAD(&s->s_cap_releases_done); | |
362 | INIT_LIST_HEAD(&s->s_cap_flushing); | |
363 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); | |
364 | ||
365 | dout("register_session mds%d\n", mds); | |
366 | if (mds >= mdsc->max_sessions) { | |
367 | int newmax = 1 << get_count_order(mds+1); | |
368 | struct ceph_mds_session **sa; | |
369 | ||
370 | dout("register_session realloc to %d\n", newmax); | |
371 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
372 | if (sa == NULL) | |
42ce56e5 | 373 | goto fail_realloc; |
2f2dc053 SW |
374 | if (mdsc->sessions) { |
375 | memcpy(sa, mdsc->sessions, | |
376 | mdsc->max_sessions * sizeof(void *)); | |
377 | kfree(mdsc->sessions); | |
378 | } | |
379 | mdsc->sessions = sa; | |
380 | mdsc->max_sessions = newmax; | |
381 | } | |
382 | mdsc->sessions[mds] = s; | |
383 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ | |
42ce56e5 SW |
384 | |
385 | ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
386 | ||
2f2dc053 | 387 | return s; |
42ce56e5 SW |
388 | |
389 | fail_realloc: | |
390 | kfree(s); | |
391 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
392 | } |
393 | ||
394 | /* | |
395 | * called under mdsc->mutex | |
396 | */ | |
2600d2dd | 397 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 398 | struct ceph_mds_session *s) |
2f2dc053 | 399 | { |
2600d2dd SW |
400 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
401 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
402 | mdsc->sessions[s->s_mds] = NULL; |
403 | ceph_con_close(&s->s_con); | |
404 | ceph_put_mds_session(s); | |
2f2dc053 SW |
405 | } |
406 | ||
407 | /* | |
408 | * drop session refs in request. | |
409 | * | |
410 | * should be last request ref, or hold mdsc->mutex | |
411 | */ | |
412 | static void put_request_session(struct ceph_mds_request *req) | |
413 | { | |
414 | if (req->r_session) { | |
415 | ceph_put_mds_session(req->r_session); | |
416 | req->r_session = NULL; | |
417 | } | |
418 | } | |
419 | ||
153c8e6b | 420 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 421 | { |
153c8e6b SW |
422 | struct ceph_mds_request *req = container_of(kref, |
423 | struct ceph_mds_request, | |
424 | r_kref); | |
425 | if (req->r_request) | |
426 | ceph_msg_put(req->r_request); | |
427 | if (req->r_reply) { | |
428 | ceph_msg_put(req->r_reply); | |
429 | destroy_reply_info(&req->r_reply_info); | |
430 | } | |
431 | if (req->r_inode) { | |
432 | ceph_put_cap_refs(ceph_inode(req->r_inode), | |
433 | CEPH_CAP_PIN); | |
434 | iput(req->r_inode); | |
435 | } | |
436 | if (req->r_locked_dir) | |
437 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), | |
438 | CEPH_CAP_PIN); | |
439 | if (req->r_target_inode) | |
440 | iput(req->r_target_inode); | |
441 | if (req->r_dentry) | |
442 | dput(req->r_dentry); | |
443 | if (req->r_old_dentry) { | |
444 | ceph_put_cap_refs( | |
445 | ceph_inode(req->r_old_dentry->d_parent->d_inode), | |
446 | CEPH_CAP_PIN); | |
447 | dput(req->r_old_dentry); | |
2f2dc053 | 448 | } |
153c8e6b SW |
449 | kfree(req->r_path1); |
450 | kfree(req->r_path2); | |
451 | put_request_session(req); | |
452 | ceph_unreserve_caps(&req->r_caps_reservation); | |
453 | kfree(req); | |
2f2dc053 SW |
454 | } |
455 | ||
456 | /* | |
457 | * lookup session, bump ref if found. | |
458 | * | |
459 | * called under mdsc->mutex. | |
460 | */ | |
461 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, | |
462 | u64 tid) | |
463 | { | |
464 | struct ceph_mds_request *req; | |
44ca18f2 SW |
465 | struct rb_node *n = mdsc->request_tree.rb_node; |
466 | ||
467 | while (n) { | |
468 | req = rb_entry(n, struct ceph_mds_request, r_node); | |
469 | if (tid < req->r_tid) | |
470 | n = n->rb_left; | |
471 | else if (tid > req->r_tid) | |
472 | n = n->rb_right; | |
473 | else { | |
474 | ceph_mdsc_get_request(req); | |
475 | return req; | |
476 | } | |
477 | } | |
478 | return NULL; | |
479 | } | |
480 | ||
481 | static void __insert_request(struct ceph_mds_client *mdsc, | |
482 | struct ceph_mds_request *new) | |
483 | { | |
484 | struct rb_node **p = &mdsc->request_tree.rb_node; | |
485 | struct rb_node *parent = NULL; | |
486 | struct ceph_mds_request *req = NULL; | |
487 | ||
488 | while (*p) { | |
489 | parent = *p; | |
490 | req = rb_entry(parent, struct ceph_mds_request, r_node); | |
491 | if (new->r_tid < req->r_tid) | |
492 | p = &(*p)->rb_left; | |
493 | else if (new->r_tid > req->r_tid) | |
494 | p = &(*p)->rb_right; | |
495 | else | |
496 | BUG(); | |
497 | } | |
498 | ||
499 | rb_link_node(&new->r_node, parent, p); | |
500 | rb_insert_color(&new->r_node, &mdsc->request_tree); | |
2f2dc053 SW |
501 | } |
502 | ||
503 | /* | |
504 | * Register an in-flight request, and assign a tid. Link to directory | |
505 | * are modifying (if any). | |
506 | * | |
507 | * Called under mdsc->mutex. | |
508 | */ | |
509 | static void __register_request(struct ceph_mds_client *mdsc, | |
510 | struct ceph_mds_request *req, | |
511 | struct inode *dir) | |
512 | { | |
513 | req->r_tid = ++mdsc->last_tid; | |
514 | if (req->r_num_caps) | |
515 | ceph_reserve_caps(&req->r_caps_reservation, req->r_num_caps); | |
516 | dout("__register_request %p tid %lld\n", req, req->r_tid); | |
517 | ceph_mdsc_get_request(req); | |
44ca18f2 | 518 | __insert_request(mdsc, req); |
2f2dc053 SW |
519 | |
520 | if (dir) { | |
521 | struct ceph_inode_info *ci = ceph_inode(dir); | |
522 | ||
523 | spin_lock(&ci->i_unsafe_lock); | |
524 | req->r_unsafe_dir = dir; | |
525 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
526 | spin_unlock(&ci->i_unsafe_lock); | |
527 | } | |
528 | } | |
529 | ||
530 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
531 | struct ceph_mds_request *req) | |
532 | { | |
533 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
44ca18f2 | 534 | rb_erase(&req->r_node, &mdsc->request_tree); |
80fc7314 | 535 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
536 | |
537 | if (req->r_unsafe_dir) { | |
538 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); | |
539 | ||
540 | spin_lock(&ci->i_unsafe_lock); | |
541 | list_del_init(&req->r_unsafe_dir_item); | |
542 | spin_unlock(&ci->i_unsafe_lock); | |
543 | } | |
94aa8ae1 SW |
544 | |
545 | ceph_mdsc_put_request(req); | |
2f2dc053 SW |
546 | } |
547 | ||
548 | /* | |
549 | * Choose mds to send request to next. If there is a hint set in the | |
550 | * request (e.g., due to a prior forward hint from the mds), use that. | |
551 | * Otherwise, consult frag tree and/or caps to identify the | |
552 | * appropriate mds. If all else fails, choose randomly. | |
553 | * | |
554 | * Called under mdsc->mutex. | |
555 | */ | |
556 | static int __choose_mds(struct ceph_mds_client *mdsc, | |
557 | struct ceph_mds_request *req) | |
558 | { | |
559 | struct inode *inode; | |
560 | struct ceph_inode_info *ci; | |
561 | struct ceph_cap *cap; | |
562 | int mode = req->r_direct_mode; | |
563 | int mds = -1; | |
564 | u32 hash = req->r_direct_hash; | |
565 | bool is_hash = req->r_direct_is_hash; | |
566 | ||
567 | /* | |
568 | * is there a specific mds we should try? ignore hint if we have | |
569 | * no session and the mds is not up (active or recovering). | |
570 | */ | |
571 | if (req->r_resend_mds >= 0 && | |
572 | (__have_session(mdsc, req->r_resend_mds) || | |
573 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
574 | dout("choose_mds using resend_mds mds%d\n", | |
575 | req->r_resend_mds); | |
576 | return req->r_resend_mds; | |
577 | } | |
578 | ||
579 | if (mode == USE_RANDOM_MDS) | |
580 | goto random; | |
581 | ||
582 | inode = NULL; | |
583 | if (req->r_inode) { | |
584 | inode = req->r_inode; | |
585 | } else if (req->r_dentry) { | |
586 | if (req->r_dentry->d_inode) { | |
587 | inode = req->r_dentry->d_inode; | |
588 | } else { | |
589 | inode = req->r_dentry->d_parent->d_inode; | |
590 | hash = req->r_dentry->d_name.hash; | |
591 | is_hash = true; | |
592 | } | |
593 | } | |
594 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, | |
595 | (int)hash, mode); | |
596 | if (!inode) | |
597 | goto random; | |
598 | ci = ceph_inode(inode); | |
599 | ||
600 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
601 | struct ceph_inode_frag frag; | |
602 | int found; | |
603 | ||
604 | ceph_choose_frag(ci, hash, &frag, &found); | |
605 | if (found) { | |
606 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
607 | u8 r; | |
608 | ||
609 | /* choose a random replica */ | |
610 | get_random_bytes(&r, 1); | |
611 | r %= frag.ndist; | |
612 | mds = frag.dist[r]; | |
613 | dout("choose_mds %p %llx.%llx " | |
614 | "frag %u mds%d (%d/%d)\n", | |
615 | inode, ceph_vinop(inode), | |
616 | frag.frag, frag.mds, | |
617 | (int)r, frag.ndist); | |
618 | return mds; | |
619 | } | |
620 | ||
621 | /* since this file/dir wasn't known to be | |
622 | * replicated, then we want to look for the | |
623 | * authoritative mds. */ | |
624 | mode = USE_AUTH_MDS; | |
625 | if (frag.mds >= 0) { | |
626 | /* choose auth mds */ | |
627 | mds = frag.mds; | |
628 | dout("choose_mds %p %llx.%llx " | |
629 | "frag %u mds%d (auth)\n", | |
630 | inode, ceph_vinop(inode), frag.frag, mds); | |
631 | return mds; | |
632 | } | |
633 | } | |
634 | } | |
635 | ||
636 | spin_lock(&inode->i_lock); | |
637 | cap = NULL; | |
638 | if (mode == USE_AUTH_MDS) | |
639 | cap = ci->i_auth_cap; | |
640 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
641 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
642 | if (!cap) { | |
643 | spin_unlock(&inode->i_lock); | |
644 | goto random; | |
645 | } | |
646 | mds = cap->session->s_mds; | |
647 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
648 | inode, ceph_vinop(inode), mds, | |
649 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
650 | spin_unlock(&inode->i_lock); | |
651 | return mds; | |
652 | ||
653 | random: | |
654 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
655 | dout("choose_mds chose random mds%d\n", mds); | |
656 | return mds; | |
657 | } | |
658 | ||
659 | ||
660 | /* | |
661 | * session messages | |
662 | */ | |
663 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
664 | { | |
665 | struct ceph_msg *msg; | |
666 | struct ceph_mds_session_head *h; | |
667 | ||
bb257664 | 668 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h)); |
a79832f2 | 669 | if (!msg) { |
2f2dc053 | 670 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 671 | return NULL; |
2f2dc053 SW |
672 | } |
673 | h = msg->front.iov_base; | |
674 | h->op = cpu_to_le32(op); | |
675 | h->seq = cpu_to_le64(seq); | |
676 | return msg; | |
677 | } | |
678 | ||
679 | /* | |
680 | * send session open request. | |
681 | * | |
682 | * called under mdsc->mutex | |
683 | */ | |
684 | static int __open_session(struct ceph_mds_client *mdsc, | |
685 | struct ceph_mds_session *session) | |
686 | { | |
687 | struct ceph_msg *msg; | |
688 | int mstate; | |
689 | int mds = session->s_mds; | |
2f2dc053 SW |
690 | |
691 | /* wait for mds to go active? */ | |
692 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
693 | dout("open_session to mds%d (%s)\n", mds, | |
694 | ceph_mds_state_name(mstate)); | |
695 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
696 | session->s_renew_requested = jiffies; | |
697 | ||
698 | /* send connect message */ | |
699 | msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq); | |
a79832f2 SW |
700 | if (!msg) |
701 | return -ENOMEM; | |
2f2dc053 | 702 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
703 | return 0; |
704 | } | |
705 | ||
706 | /* | |
707 | * session caps | |
708 | */ | |
709 | ||
710 | /* | |
711 | * Free preallocated cap messages assigned to this session | |
712 | */ | |
713 | static void cleanup_cap_releases(struct ceph_mds_session *session) | |
714 | { | |
715 | struct ceph_msg *msg; | |
716 | ||
717 | spin_lock(&session->s_cap_lock); | |
718 | while (!list_empty(&session->s_cap_releases)) { | |
719 | msg = list_first_entry(&session->s_cap_releases, | |
720 | struct ceph_msg, list_head); | |
721 | list_del_init(&msg->list_head); | |
722 | ceph_msg_put(msg); | |
723 | } | |
724 | while (!list_empty(&session->s_cap_releases_done)) { | |
725 | msg = list_first_entry(&session->s_cap_releases_done, | |
726 | struct ceph_msg, list_head); | |
727 | list_del_init(&msg->list_head); | |
728 | ceph_msg_put(msg); | |
729 | } | |
730 | spin_unlock(&session->s_cap_lock); | |
731 | } | |
732 | ||
733 | /* | |
f818a736 SW |
734 | * Helper to safely iterate over all caps associated with a session, with |
735 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 736 | * |
f818a736 | 737 | * Caller must hold session s_mutex. |
2f2dc053 SW |
738 | */ |
739 | static int iterate_session_caps(struct ceph_mds_session *session, | |
740 | int (*cb)(struct inode *, struct ceph_cap *, | |
741 | void *), void *arg) | |
742 | { | |
7c1332b8 SW |
743 | struct list_head *p; |
744 | struct ceph_cap *cap; | |
745 | struct inode *inode, *last_inode = NULL; | |
746 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
747 | int ret; |
748 | ||
749 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
750 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
751 | p = session->s_caps.next; |
752 | while (p != &session->s_caps) { | |
753 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 754 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
755 | if (!inode) { |
756 | p = p->next; | |
2f2dc053 | 757 | continue; |
7c1332b8 SW |
758 | } |
759 | session->s_cap_iterator = cap; | |
2f2dc053 | 760 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
761 | |
762 | if (last_inode) { | |
763 | iput(last_inode); | |
764 | last_inode = NULL; | |
765 | } | |
766 | if (old_cap) { | |
767 | ceph_put_cap(old_cap); | |
768 | old_cap = NULL; | |
769 | } | |
770 | ||
2f2dc053 | 771 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
772 | last_inode = inode; |
773 | ||
2f2dc053 | 774 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
775 | p = p->next; |
776 | if (cap->ci == NULL) { | |
777 | dout("iterate_session_caps finishing cap %p removal\n", | |
778 | cap); | |
779 | BUG_ON(cap->session != session); | |
780 | list_del_init(&cap->session_caps); | |
781 | session->s_nr_caps--; | |
782 | cap->session = NULL; | |
783 | old_cap = cap; /* put_cap it w/o locks held */ | |
784 | } | |
5dacf091 SW |
785 | if (ret < 0) |
786 | goto out; | |
2f2dc053 | 787 | } |
5dacf091 SW |
788 | ret = 0; |
789 | out: | |
7c1332b8 | 790 | session->s_cap_iterator = NULL; |
2f2dc053 | 791 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
792 | |
793 | if (last_inode) | |
794 | iput(last_inode); | |
795 | if (old_cap) | |
796 | ceph_put_cap(old_cap); | |
797 | ||
5dacf091 | 798 | return ret; |
2f2dc053 SW |
799 | } |
800 | ||
801 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
802 | void *arg) | |
803 | { | |
804 | struct ceph_inode_info *ci = ceph_inode(inode); | |
805 | dout("removing cap %p, ci is %p, inode is %p\n", | |
806 | cap, ci, &ci->vfs_inode); | |
807 | ceph_remove_cap(cap); | |
808 | return 0; | |
809 | } | |
810 | ||
811 | /* | |
812 | * caller must hold session s_mutex | |
813 | */ | |
814 | static void remove_session_caps(struct ceph_mds_session *session) | |
815 | { | |
816 | dout("remove_session_caps on %p\n", session); | |
817 | iterate_session_caps(session, remove_session_caps_cb, NULL); | |
818 | BUG_ON(session->s_nr_caps > 0); | |
819 | cleanup_cap_releases(session); | |
820 | } | |
821 | ||
822 | /* | |
823 | * wake up any threads waiting on this session's caps. if the cap is | |
824 | * old (didn't get renewed on the client reconnect), remove it now. | |
825 | * | |
826 | * caller must hold s_mutex. | |
827 | */ | |
828 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
829 | void *arg) | |
830 | { | |
0dc2570f SW |
831 | struct ceph_inode_info *ci = ceph_inode(inode); |
832 | ||
833 | wake_up(&ci->i_cap_wq); | |
834 | if (arg) { | |
835 | spin_lock(&inode->i_lock); | |
836 | ci->i_wanted_max_size = 0; | |
837 | ci->i_requested_max_size = 0; | |
838 | spin_unlock(&inode->i_lock); | |
839 | } | |
2f2dc053 SW |
840 | return 0; |
841 | } | |
842 | ||
0dc2570f SW |
843 | static void wake_up_session_caps(struct ceph_mds_session *session, |
844 | int reconnect) | |
2f2dc053 SW |
845 | { |
846 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
847 | iterate_session_caps(session, wake_up_session_cb, |
848 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
849 | } |
850 | ||
851 | /* | |
852 | * Send periodic message to MDS renewing all currently held caps. The | |
853 | * ack will reset the expiration for all caps from this session. | |
854 | * | |
855 | * caller holds s_mutex | |
856 | */ | |
857 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
858 | struct ceph_mds_session *session) | |
859 | { | |
860 | struct ceph_msg *msg; | |
861 | int state; | |
862 | ||
863 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
864 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
865 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 866 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
867 | |
868 | /* do not try to renew caps until a recovering mds has reconnected | |
869 | * with its clients. */ | |
870 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
871 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
872 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
873 | session->s_mds, ceph_mds_state_name(state)); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
878 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
879 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
880 | ++session->s_renew_seq); | |
a79832f2 SW |
881 | if (!msg) |
882 | return -ENOMEM; | |
2f2dc053 SW |
883 | ceph_con_send(&session->s_con, msg); |
884 | return 0; | |
885 | } | |
886 | ||
887 | /* | |
888 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
889 | * |
890 | * Called under session->s_mutex | |
2f2dc053 SW |
891 | */ |
892 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
893 | struct ceph_mds_session *session, int is_renew) | |
894 | { | |
895 | int was_stale; | |
896 | int wake = 0; | |
897 | ||
898 | spin_lock(&session->s_cap_lock); | |
899 | was_stale = is_renew && (session->s_cap_ttl == 0 || | |
900 | time_after_eq(jiffies, session->s_cap_ttl)); | |
901 | ||
902 | session->s_cap_ttl = session->s_renew_requested + | |
903 | mdsc->mdsmap->m_session_timeout*HZ; | |
904 | ||
905 | if (was_stale) { | |
906 | if (time_before(jiffies, session->s_cap_ttl)) { | |
907 | pr_info("mds%d caps renewed\n", session->s_mds); | |
908 | wake = 1; | |
909 | } else { | |
910 | pr_info("mds%d caps still stale\n", session->s_mds); | |
911 | } | |
912 | } | |
913 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
914 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
915 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
916 | spin_unlock(&session->s_cap_lock); | |
917 | ||
918 | if (wake) | |
0dc2570f | 919 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
920 | } |
921 | ||
922 | /* | |
923 | * send a session close request | |
924 | */ | |
925 | static int request_close_session(struct ceph_mds_client *mdsc, | |
926 | struct ceph_mds_session *session) | |
927 | { | |
928 | struct ceph_msg *msg; | |
2f2dc053 SW |
929 | |
930 | dout("request_close_session mds%d state %s seq %lld\n", | |
931 | session->s_mds, session_state_name(session->s_state), | |
932 | session->s_seq); | |
933 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
934 | if (!msg) |
935 | return -ENOMEM; | |
936 | ceph_con_send(&session->s_con, msg); | |
937 | return 0; | |
2f2dc053 SW |
938 | } |
939 | ||
940 | /* | |
941 | * Called with s_mutex held. | |
942 | */ | |
943 | static int __close_session(struct ceph_mds_client *mdsc, | |
944 | struct ceph_mds_session *session) | |
945 | { | |
946 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
947 | return 0; | |
948 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
949 | return request_close_session(mdsc, session); | |
950 | } | |
951 | ||
952 | /* | |
953 | * Trim old(er) caps. | |
954 | * | |
955 | * Because we can't cache an inode without one or more caps, we do | |
956 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
957 | * point the inode will hopefully get dropped to. | |
958 | * | |
959 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
960 | * memory pressure from the MDS, though, so it needn't be perfect. | |
961 | */ | |
962 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
963 | { | |
964 | struct ceph_mds_session *session = arg; | |
965 | struct ceph_inode_info *ci = ceph_inode(inode); | |
966 | int used, oissued, mine; | |
967 | ||
968 | if (session->s_trim_caps <= 0) | |
969 | return -1; | |
970 | ||
971 | spin_lock(&inode->i_lock); | |
972 | mine = cap->issued | cap->implemented; | |
973 | used = __ceph_caps_used(ci); | |
974 | oissued = __ceph_caps_issued_other(ci, cap); | |
975 | ||
976 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n", | |
977 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), | |
978 | ceph_cap_string(used)); | |
979 | if (ci->i_dirty_caps) | |
980 | goto out; /* dirty caps */ | |
981 | if ((used & ~oissued) & mine) | |
982 | goto out; /* we need these caps */ | |
983 | ||
984 | session->s_trim_caps--; | |
985 | if (oissued) { | |
986 | /* we aren't the only cap.. just remove us */ | |
7c1332b8 | 987 | __ceph_remove_cap(cap); |
2f2dc053 SW |
988 | } else { |
989 | /* try to drop referring dentries */ | |
990 | spin_unlock(&inode->i_lock); | |
991 | d_prune_aliases(inode); | |
992 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
993 | inode, cap, atomic_read(&inode->i_count)); | |
994 | return 0; | |
995 | } | |
996 | ||
997 | out: | |
998 | spin_unlock(&inode->i_lock); | |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | /* | |
1003 | * Trim session cap count down to some max number. | |
1004 | */ | |
1005 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1006 | struct ceph_mds_session *session, | |
1007 | int max_caps) | |
1008 | { | |
1009 | int trim_caps = session->s_nr_caps - max_caps; | |
1010 | ||
1011 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1012 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1013 | if (trim_caps > 0) { | |
1014 | session->s_trim_caps = trim_caps; | |
1015 | iterate_session_caps(session, trim_caps_cb, session); | |
1016 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1017 | session->s_mds, session->s_nr_caps, max_caps, | |
1018 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1019 | session->s_trim_caps = 0; |
2f2dc053 SW |
1020 | } |
1021 | return 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Allocate cap_release messages. If there is a partially full message | |
1026 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1027 | * we can send it immediately. | |
1028 | * | |
1029 | * Called under s_mutex. | |
1030 | */ | |
1031 | static int add_cap_releases(struct ceph_mds_client *mdsc, | |
1032 | struct ceph_mds_session *session, | |
1033 | int extra) | |
1034 | { | |
1035 | struct ceph_msg *msg; | |
1036 | struct ceph_mds_cap_release *head; | |
1037 | int err = -ENOMEM; | |
1038 | ||
1039 | if (extra < 0) | |
6b805185 | 1040 | extra = mdsc->client->mount_args->cap_release_safety; |
2f2dc053 SW |
1041 | |
1042 | spin_lock(&session->s_cap_lock); | |
1043 | ||
1044 | if (!list_empty(&session->s_cap_releases)) { | |
1045 | msg = list_first_entry(&session->s_cap_releases, | |
1046 | struct ceph_msg, | |
1047 | list_head); | |
1048 | head = msg->front.iov_base; | |
1049 | extra += CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num); | |
1050 | } | |
1051 | ||
1052 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { | |
1053 | spin_unlock(&session->s_cap_lock); | |
bb257664 | 1054 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE); |
2f2dc053 SW |
1055 | if (!msg) |
1056 | goto out_unlocked; | |
1057 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1058 | (int)msg->front.iov_len); | |
1059 | head = msg->front.iov_base; | |
1060 | head->num = cpu_to_le32(0); | |
1061 | msg->front.iov_len = sizeof(*head); | |
1062 | spin_lock(&session->s_cap_lock); | |
1063 | list_add(&msg->list_head, &session->s_cap_releases); | |
1064 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1065 | } | |
1066 | ||
1067 | if (!list_empty(&session->s_cap_releases)) { | |
1068 | msg = list_first_entry(&session->s_cap_releases, | |
1069 | struct ceph_msg, | |
1070 | list_head); | |
1071 | head = msg->front.iov_base; | |
1072 | if (head->num) { | |
1073 | dout(" queueing non-full %p (%d)\n", msg, | |
1074 | le32_to_cpu(head->num)); | |
1075 | list_move_tail(&msg->list_head, | |
1076 | &session->s_cap_releases_done); | |
1077 | session->s_num_cap_releases -= | |
1078 | CEPH_CAPS_PER_RELEASE - le32_to_cpu(head->num); | |
1079 | } | |
1080 | } | |
1081 | err = 0; | |
1082 | spin_unlock(&session->s_cap_lock); | |
1083 | out_unlocked: | |
1084 | return err; | |
1085 | } | |
1086 | ||
1087 | /* | |
1088 | * flush all dirty inode data to disk. | |
1089 | * | |
1090 | * returns true if we've flushed through want_flush_seq | |
1091 | */ | |
1092 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1093 | { | |
1094 | int mds, ret = 1; | |
1095 | ||
1096 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1097 | mutex_lock(&mdsc->mutex); | |
1098 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1099 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1100 | ||
1101 | if (!session) | |
1102 | continue; | |
1103 | get_session(session); | |
1104 | mutex_unlock(&mdsc->mutex); | |
1105 | ||
1106 | mutex_lock(&session->s_mutex); | |
1107 | if (!list_empty(&session->s_cap_flushing)) { | |
1108 | struct ceph_inode_info *ci = | |
1109 | list_entry(session->s_cap_flushing.next, | |
1110 | struct ceph_inode_info, | |
1111 | i_flushing_item); | |
1112 | struct inode *inode = &ci->vfs_inode; | |
1113 | ||
1114 | spin_lock(&inode->i_lock); | |
1115 | if (ci->i_cap_flush_seq <= want_flush_seq) { | |
1116 | dout("check_cap_flush still flushing %p " | |
1117 | "seq %lld <= %lld to mds%d\n", inode, | |
1118 | ci->i_cap_flush_seq, want_flush_seq, | |
1119 | session->s_mds); | |
1120 | ret = 0; | |
1121 | } | |
1122 | spin_unlock(&inode->i_lock); | |
1123 | } | |
1124 | mutex_unlock(&session->s_mutex); | |
1125 | ceph_put_mds_session(session); | |
1126 | ||
1127 | if (!ret) | |
1128 | return ret; | |
1129 | mutex_lock(&mdsc->mutex); | |
1130 | } | |
1131 | ||
1132 | mutex_unlock(&mdsc->mutex); | |
1133 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | /* | |
1138 | * called under s_mutex | |
1139 | */ | |
1140 | static void send_cap_releases(struct ceph_mds_client *mdsc, | |
1141 | struct ceph_mds_session *session) | |
1142 | { | |
1143 | struct ceph_msg *msg; | |
1144 | ||
1145 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1146 | spin_lock(&session->s_cap_lock); |
1147 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1148 | msg = list_first_entry(&session->s_cap_releases_done, |
1149 | struct ceph_msg, list_head); | |
1150 | list_del_init(&msg->list_head); | |
1151 | spin_unlock(&session->s_cap_lock); | |
1152 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1153 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1154 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1155 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1156 | } |
1157 | spin_unlock(&session->s_cap_lock); | |
1158 | } | |
1159 | ||
e01a5946 SW |
1160 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1161 | struct ceph_mds_session *session) | |
1162 | { | |
1163 | struct ceph_msg *msg; | |
1164 | struct ceph_mds_cap_release *head; | |
1165 | unsigned num; | |
1166 | ||
1167 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
1168 | spin_lock(&session->s_cap_lock); | |
1169 | ||
1170 | /* zero out the in-progress message */ | |
1171 | msg = list_first_entry(&session->s_cap_releases, | |
1172 | struct ceph_msg, list_head); | |
1173 | head = msg->front.iov_base; | |
1174 | num = le32_to_cpu(head->num); | |
1175 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num); | |
1176 | head->num = cpu_to_le32(0); | |
1177 | session->s_num_cap_releases += num; | |
1178 | ||
1179 | /* requeue completed messages */ | |
1180 | while (!list_empty(&session->s_cap_releases_done)) { | |
1181 | msg = list_first_entry(&session->s_cap_releases_done, | |
1182 | struct ceph_msg, list_head); | |
1183 | list_del_init(&msg->list_head); | |
1184 | ||
1185 | head = msg->front.iov_base; | |
1186 | num = le32_to_cpu(head->num); | |
1187 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1188 | num); | |
1189 | session->s_num_cap_releases += num; | |
1190 | head->num = cpu_to_le32(0); | |
1191 | msg->front.iov_len = sizeof(*head); | |
1192 | list_add(&msg->list_head, &session->s_cap_releases); | |
1193 | } | |
1194 | ||
1195 | spin_unlock(&session->s_cap_lock); | |
1196 | } | |
1197 | ||
2f2dc053 SW |
1198 | /* |
1199 | * requests | |
1200 | */ | |
1201 | ||
1202 | /* | |
1203 | * Create an mds request. | |
1204 | */ | |
1205 | struct ceph_mds_request * | |
1206 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1207 | { | |
1208 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1209 | ||
1210 | if (!req) | |
1211 | return ERR_PTR(-ENOMEM); | |
1212 | ||
b4556396 | 1213 | mutex_init(&req->r_fill_mutex); |
2f2dc053 SW |
1214 | req->r_started = jiffies; |
1215 | req->r_resend_mds = -1; | |
1216 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1217 | req->r_fmode = -1; | |
153c8e6b | 1218 | kref_init(&req->r_kref); |
2f2dc053 SW |
1219 | INIT_LIST_HEAD(&req->r_wait); |
1220 | init_completion(&req->r_completion); | |
1221 | init_completion(&req->r_safe_completion); | |
1222 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1223 | ||
1224 | req->r_op = op; | |
1225 | req->r_direct_mode = mode; | |
1226 | return req; | |
1227 | } | |
1228 | ||
1229 | /* | |
44ca18f2 | 1230 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1231 | * |
1232 | * called under mdsc->mutex. | |
1233 | */ | |
44ca18f2 SW |
1234 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1235 | { | |
1236 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1237 | return NULL; | |
1238 | return rb_entry(rb_first(&mdsc->request_tree), | |
1239 | struct ceph_mds_request, r_node); | |
1240 | } | |
1241 | ||
2f2dc053 SW |
1242 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1243 | { | |
44ca18f2 SW |
1244 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1245 | ||
1246 | if (req) | |
1247 | return req->r_tid; | |
1248 | return 0; | |
2f2dc053 SW |
1249 | } |
1250 | ||
1251 | /* | |
1252 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1253 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1254 | * | |
1255 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1256 | * inode. | |
1257 | * | |
1258 | * Encode hidden .snap dirs as a double /, i.e. | |
1259 | * foo/.snap/bar -> foo//bar | |
1260 | */ | |
1261 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1262 | int stop_on_nosnap) | |
1263 | { | |
1264 | struct dentry *temp; | |
1265 | char *path; | |
1266 | int len, pos; | |
1267 | ||
1268 | if (dentry == NULL) | |
1269 | return ERR_PTR(-EINVAL); | |
1270 | ||
1271 | retry: | |
1272 | len = 0; | |
1273 | for (temp = dentry; !IS_ROOT(temp);) { | |
1274 | struct inode *inode = temp->d_inode; | |
1275 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1276 | len++; /* slash only */ | |
1277 | else if (stop_on_nosnap && inode && | |
1278 | ceph_snap(inode) == CEPH_NOSNAP) | |
1279 | break; | |
1280 | else | |
1281 | len += 1 + temp->d_name.len; | |
1282 | temp = temp->d_parent; | |
1283 | if (temp == NULL) { | |
1284 | pr_err("build_path_dentry corrupt dentry %p\n", dentry); | |
1285 | return ERR_PTR(-EINVAL); | |
1286 | } | |
1287 | } | |
1288 | if (len) | |
1289 | len--; /* no leading '/' */ | |
1290 | ||
1291 | path = kmalloc(len+1, GFP_NOFS); | |
1292 | if (path == NULL) | |
1293 | return ERR_PTR(-ENOMEM); | |
1294 | pos = len; | |
1295 | path[pos] = 0; /* trailing null */ | |
1296 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { | |
1297 | struct inode *inode = temp->d_inode; | |
1298 | ||
1299 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { | |
104648ad | 1300 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1301 | pos, temp); |
1302 | } else if (stop_on_nosnap && inode && | |
1303 | ceph_snap(inode) == CEPH_NOSNAP) { | |
1304 | break; | |
1305 | } else { | |
1306 | pos -= temp->d_name.len; | |
1307 | if (pos < 0) | |
1308 | break; | |
1309 | strncpy(path + pos, temp->d_name.name, | |
1310 | temp->d_name.len); | |
2f2dc053 SW |
1311 | } |
1312 | if (pos) | |
1313 | path[--pos] = '/'; | |
1314 | temp = temp->d_parent; | |
1315 | if (temp == NULL) { | |
104648ad | 1316 | pr_err("build_path corrupt dentry\n"); |
2f2dc053 SW |
1317 | kfree(path); |
1318 | return ERR_PTR(-EINVAL); | |
1319 | } | |
1320 | } | |
1321 | if (pos != 0) { | |
104648ad | 1322 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1323 | "expected, namelen is %d, pos is %d\n", len, pos); |
1324 | /* presumably this is only possible if racing with a | |
1325 | rename of one of the parent directories (we can not | |
1326 | lock the dentries above us to prevent this, but | |
1327 | retrying should be harmless) */ | |
1328 | kfree(path); | |
1329 | goto retry; | |
1330 | } | |
1331 | ||
1332 | *base = ceph_ino(temp->d_inode); | |
1333 | *plen = len; | |
104648ad | 1334 | dout("build_path on %p %d built %llx '%.*s'\n", |
2f2dc053 SW |
1335 | dentry, atomic_read(&dentry->d_count), *base, len, path); |
1336 | return path; | |
1337 | } | |
1338 | ||
1339 | static int build_dentry_path(struct dentry *dentry, | |
1340 | const char **ppath, int *ppathlen, u64 *pino, | |
1341 | int *pfreepath) | |
1342 | { | |
1343 | char *path; | |
1344 | ||
1345 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1346 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1347 | *ppath = dentry->d_name.name; | |
1348 | *ppathlen = dentry->d_name.len; | |
1349 | return 0; | |
1350 | } | |
1351 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1352 | if (IS_ERR(path)) | |
1353 | return PTR_ERR(path); | |
1354 | *ppath = path; | |
1355 | *pfreepath = 1; | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | static int build_inode_path(struct inode *inode, | |
1360 | const char **ppath, int *ppathlen, u64 *pino, | |
1361 | int *pfreepath) | |
1362 | { | |
1363 | struct dentry *dentry; | |
1364 | char *path; | |
1365 | ||
1366 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1367 | *pino = ceph_ino(inode); | |
1368 | *ppathlen = 0; | |
1369 | return 0; | |
1370 | } | |
1371 | dentry = d_find_alias(inode); | |
1372 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1373 | dput(dentry); | |
1374 | if (IS_ERR(path)) | |
1375 | return PTR_ERR(path); | |
1376 | *ppath = path; | |
1377 | *pfreepath = 1; | |
1378 | return 0; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * request arguments may be specified via an inode *, a dentry *, or | |
1383 | * an explicit ino+path. | |
1384 | */ | |
1385 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1386 | const char *rpath, u64 rino, | |
1387 | const char **ppath, int *pathlen, | |
1388 | u64 *ino, int *freepath) | |
1389 | { | |
1390 | int r = 0; | |
1391 | ||
1392 | if (rinode) { | |
1393 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1394 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1395 | ceph_snap(rinode)); | |
1396 | } else if (rdentry) { | |
1397 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1398 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1399 | *ppath); | |
1400 | } else if (rpath) { | |
1401 | *ino = rino; | |
1402 | *ppath = rpath; | |
1403 | *pathlen = strlen(rpath); | |
1404 | dout(" path %.*s\n", *pathlen, rpath); | |
1405 | } | |
1406 | ||
1407 | return r; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * called under mdsc->mutex | |
1412 | */ | |
1413 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1414 | struct ceph_mds_request *req, | |
1415 | int mds) | |
1416 | { | |
1417 | struct ceph_msg *msg; | |
1418 | struct ceph_mds_request_head *head; | |
1419 | const char *path1 = NULL; | |
1420 | const char *path2 = NULL; | |
1421 | u64 ino1 = 0, ino2 = 0; | |
1422 | int pathlen1 = 0, pathlen2 = 0; | |
1423 | int freepath1 = 0, freepath2 = 0; | |
1424 | int len; | |
1425 | u16 releases; | |
1426 | void *p, *end; | |
1427 | int ret; | |
1428 | ||
1429 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1430 | req->r_path1, req->r_ino1.ino, | |
1431 | &path1, &pathlen1, &ino1, &freepath1); | |
1432 | if (ret < 0) { | |
1433 | msg = ERR_PTR(ret); | |
1434 | goto out; | |
1435 | } | |
1436 | ||
1437 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1438 | req->r_path2, req->r_ino2.ino, | |
1439 | &path2, &pathlen2, &ino2, &freepath2); | |
1440 | if (ret < 0) { | |
1441 | msg = ERR_PTR(ret); | |
1442 | goto out_free1; | |
1443 | } | |
1444 | ||
1445 | len = sizeof(*head) + | |
ac8839d7 | 1446 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)); |
2f2dc053 SW |
1447 | |
1448 | /* calculate (max) length for cap releases */ | |
1449 | len += sizeof(struct ceph_mds_request_release) * | |
1450 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1451 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1452 | if (req->r_dentry_drop) | |
1453 | len += req->r_dentry->d_name.len; | |
1454 | if (req->r_old_dentry_drop) | |
1455 | len += req->r_old_dentry->d_name.len; | |
1456 | ||
bb257664 | 1457 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len); |
a79832f2 SW |
1458 | if (!msg) { |
1459 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1460 | goto out_free2; |
a79832f2 | 1461 | } |
2f2dc053 | 1462 | |
6df058c0 SW |
1463 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1464 | ||
2f2dc053 SW |
1465 | head = msg->front.iov_base; |
1466 | p = msg->front.iov_base + sizeof(*head); | |
1467 | end = msg->front.iov_base + msg->front.iov_len; | |
1468 | ||
1469 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1470 | head->op = cpu_to_le32(req->r_op); | |
1471 | head->caller_uid = cpu_to_le32(current_fsuid()); | |
1472 | head->caller_gid = cpu_to_le32(current_fsgid()); | |
1473 | head->args = req->r_args; | |
1474 | ||
1475 | ceph_encode_filepath(&p, end, ino1, path1); | |
1476 | ceph_encode_filepath(&p, end, ino2, path2); | |
1477 | ||
1478 | /* cap releases */ | |
1479 | releases = 0; | |
1480 | if (req->r_inode_drop) | |
1481 | releases += ceph_encode_inode_release(&p, | |
1482 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1483 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1484 | if (req->r_dentry_drop) | |
1485 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1486 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1487 | if (req->r_old_dentry_drop) | |
1488 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1489 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1490 | if (req->r_old_inode_drop) | |
1491 | releases += ceph_encode_inode_release(&p, | |
1492 | req->r_old_dentry->d_inode, | |
1493 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1494 | head->num_releases = cpu_to_le16(releases); | |
1495 | ||
1496 | BUG_ON(p > end); | |
1497 | msg->front.iov_len = p - msg->front.iov_base; | |
1498 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1499 | ||
1500 | msg->pages = req->r_pages; | |
1501 | msg->nr_pages = req->r_num_pages; | |
1502 | msg->hdr.data_len = cpu_to_le32(req->r_data_len); | |
1503 | msg->hdr.data_off = cpu_to_le16(0); | |
1504 | ||
1505 | out_free2: | |
1506 | if (freepath2) | |
1507 | kfree((char *)path2); | |
1508 | out_free1: | |
1509 | if (freepath1) | |
1510 | kfree((char *)path1); | |
1511 | out: | |
1512 | return msg; | |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * called under mdsc->mutex if error, under no mutex if | |
1517 | * success. | |
1518 | */ | |
1519 | static void complete_request(struct ceph_mds_client *mdsc, | |
1520 | struct ceph_mds_request *req) | |
1521 | { | |
1522 | if (req->r_callback) | |
1523 | req->r_callback(mdsc, req); | |
1524 | else | |
1525 | complete(&req->r_completion); | |
1526 | } | |
1527 | ||
1528 | /* | |
1529 | * called under mdsc->mutex | |
1530 | */ | |
1531 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1532 | struct ceph_mds_request *req, | |
1533 | int mds) | |
1534 | { | |
1535 | struct ceph_mds_request_head *rhead; | |
1536 | struct ceph_msg *msg; | |
1537 | int flags = 0; | |
1538 | ||
1539 | req->r_mds = mds; | |
1540 | req->r_attempts++; | |
1541 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, | |
1542 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1543 | ||
1544 | if (req->r_request) { | |
1545 | ceph_msg_put(req->r_request); | |
1546 | req->r_request = NULL; | |
1547 | } | |
1548 | msg = create_request_message(mdsc, req, mds); | |
1549 | if (IS_ERR(msg)) { | |
e1518c7c | 1550 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 1551 | complete_request(mdsc, req); |
a79832f2 | 1552 | return PTR_ERR(msg); |
2f2dc053 SW |
1553 | } |
1554 | req->r_request = msg; | |
1555 | ||
1556 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
1557 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
1558 | if (req->r_got_unsafe) | |
1559 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1560 | if (req->r_locked_dir) | |
1561 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
1562 | rhead->flags = cpu_to_le32(flags); | |
1563 | rhead->num_fwd = req->r_num_fwd; | |
1564 | rhead->num_retry = req->r_attempts - 1; | |
1565 | ||
1566 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
1567 | ||
1568 | if (req->r_target_inode && req->r_got_unsafe) | |
1569 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
1570 | else | |
1571 | rhead->ino = 0; | |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * send request, or put it on the appropriate wait list. | |
1577 | */ | |
1578 | static int __do_request(struct ceph_mds_client *mdsc, | |
1579 | struct ceph_mds_request *req) | |
1580 | { | |
1581 | struct ceph_mds_session *session = NULL; | |
1582 | int mds = -1; | |
1583 | int err = -EAGAIN; | |
1584 | ||
e1518c7c | 1585 | if (req->r_err || req->r_got_result) |
2f2dc053 SW |
1586 | goto out; |
1587 | ||
1588 | if (req->r_timeout && | |
1589 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
1590 | dout("do_request timed out\n"); | |
1591 | err = -EIO; | |
1592 | goto finish; | |
1593 | } | |
1594 | ||
1595 | mds = __choose_mds(mdsc, req); | |
1596 | if (mds < 0 || | |
1597 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
1598 | dout("do_request no mds or not active, waiting for map\n"); | |
1599 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
1600 | goto out; | |
1601 | } | |
1602 | ||
1603 | /* get, open session */ | |
1604 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 1605 | if (!session) { |
2f2dc053 | 1606 | session = register_session(mdsc, mds); |
9c423956 SW |
1607 | if (IS_ERR(session)) { |
1608 | err = PTR_ERR(session); | |
1609 | goto finish; | |
1610 | } | |
1611 | } | |
2f2dc053 SW |
1612 | dout("do_request mds%d session %p state %s\n", mds, session, |
1613 | session_state_name(session->s_state)); | |
1614 | if (session->s_state != CEPH_MDS_SESSION_OPEN && | |
1615 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
1616 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
1617 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
1618 | __open_session(mdsc, session); | |
1619 | list_add(&req->r_wait, &session->s_waiting); | |
1620 | goto out_session; | |
1621 | } | |
1622 | ||
1623 | /* send request */ | |
1624 | req->r_session = get_session(session); | |
1625 | req->r_resend_mds = -1; /* forget any previous mds hint */ | |
1626 | ||
1627 | if (req->r_request_started == 0) /* note request start time */ | |
1628 | req->r_request_started = jiffies; | |
1629 | ||
1630 | err = __prepare_send_request(mdsc, req, mds); | |
1631 | if (!err) { | |
1632 | ceph_msg_get(req->r_request); | |
1633 | ceph_con_send(&session->s_con, req->r_request); | |
1634 | } | |
1635 | ||
1636 | out_session: | |
1637 | ceph_put_mds_session(session); | |
1638 | out: | |
1639 | return err; | |
1640 | ||
1641 | finish: | |
e1518c7c | 1642 | req->r_err = err; |
2f2dc053 SW |
1643 | complete_request(mdsc, req); |
1644 | goto out; | |
1645 | } | |
1646 | ||
1647 | /* | |
1648 | * called under mdsc->mutex | |
1649 | */ | |
1650 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
1651 | struct list_head *head) | |
1652 | { | |
1653 | struct ceph_mds_request *req, *nreq; | |
1654 | ||
1655 | list_for_each_entry_safe(req, nreq, head, r_wait) { | |
1656 | list_del_init(&req->r_wait); | |
1657 | __do_request(mdsc, req); | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | /* | |
1662 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 1663 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 1664 | */ |
29790f26 | 1665 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 1666 | { |
44ca18f2 SW |
1667 | struct ceph_mds_request *req; |
1668 | struct rb_node *p; | |
2f2dc053 SW |
1669 | |
1670 | dout("kick_requests mds%d\n", mds); | |
44ca18f2 SW |
1671 | for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
1672 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
1673 | if (req->r_got_unsafe) | |
1674 | continue; | |
1675 | if (req->r_session && | |
1676 | req->r_session->s_mds == mds) { | |
1677 | dout(" kicking tid %llu\n", req->r_tid); | |
1678 | put_request_session(req); | |
1679 | __do_request(mdsc, req); | |
2f2dc053 SW |
1680 | } |
1681 | } | |
1682 | } | |
1683 | ||
1684 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
1685 | struct ceph_mds_request *req) | |
1686 | { | |
1687 | dout("submit_request on %p\n", req); | |
1688 | mutex_lock(&mdsc->mutex); | |
1689 | __register_request(mdsc, req, NULL); | |
1690 | __do_request(mdsc, req); | |
1691 | mutex_unlock(&mdsc->mutex); | |
1692 | } | |
1693 | ||
1694 | /* | |
1695 | * Synchrously perform an mds request. Take care of all of the | |
1696 | * session setup, forwarding, retry details. | |
1697 | */ | |
1698 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
1699 | struct inode *dir, | |
1700 | struct ceph_mds_request *req) | |
1701 | { | |
1702 | int err; | |
1703 | ||
1704 | dout("do_request on %p\n", req); | |
1705 | ||
1706 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
1707 | if (req->r_inode) | |
1708 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
1709 | if (req->r_locked_dir) | |
1710 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
1711 | if (req->r_old_dentry) | |
1712 | ceph_get_cap_refs( | |
1713 | ceph_inode(req->r_old_dentry->d_parent->d_inode), | |
1714 | CEPH_CAP_PIN); | |
1715 | ||
1716 | /* issue */ | |
1717 | mutex_lock(&mdsc->mutex); | |
1718 | __register_request(mdsc, req, dir); | |
1719 | __do_request(mdsc, req); | |
1720 | ||
e1518c7c SW |
1721 | if (req->r_err) { |
1722 | err = req->r_err; | |
1723 | __unregister_request(mdsc, req); | |
1724 | dout("do_request early error %d\n", err); | |
1725 | goto out; | |
2f2dc053 SW |
1726 | } |
1727 | ||
e1518c7c SW |
1728 | /* wait */ |
1729 | mutex_unlock(&mdsc->mutex); | |
1730 | dout("do_request waiting\n"); | |
1731 | if (req->r_timeout) { | |
1732 | err = (long)wait_for_completion_interruptible_timeout( | |
1733 | &req->r_completion, req->r_timeout); | |
1734 | if (err == 0) | |
1735 | err = -EIO; | |
1736 | } else { | |
1737 | err = wait_for_completion_interruptible(&req->r_completion); | |
1738 | } | |
1739 | dout("do_request waited, got %d\n", err); | |
1740 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 1741 | |
e1518c7c SW |
1742 | /* only abort if we didn't race with a real reply */ |
1743 | if (req->r_got_result) { | |
1744 | err = le32_to_cpu(req->r_reply_info.head->result); | |
1745 | } else if (err < 0) { | |
1746 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
1747 | |
1748 | /* | |
1749 | * ensure we aren't running concurrently with | |
1750 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
1751 | * rely on locks (dir mutex) held by our caller. | |
1752 | */ | |
1753 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
1754 | req->r_err = err; |
1755 | req->r_aborted = true; | |
b4556396 | 1756 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 1757 | |
e1518c7c SW |
1758 | if (req->r_locked_dir && |
1759 | (req->r_op & CEPH_MDS_OP_WRITE)) { | |
1760 | struct ceph_inode_info *ci = | |
1761 | ceph_inode(req->r_locked_dir); | |
1762 | ||
81a6cf2d | 1763 | dout("aborted, clearing I_COMPLETE on %p, leases\n", |
e1518c7c SW |
1764 | req->r_locked_dir); |
1765 | spin_lock(&req->r_locked_dir->i_lock); | |
1766 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
1767 | ci->i_release_count++; | |
1768 | spin_unlock(&req->r_locked_dir->i_lock); | |
81a6cf2d SW |
1769 | |
1770 | if (req->r_dentry) | |
1771 | ceph_invalidate_dentry_lease(req->r_dentry); | |
1772 | if (req->r_old_dentry) | |
1773 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
5b1daecd | 1774 | } |
2f2dc053 | 1775 | } else { |
e1518c7c | 1776 | err = req->r_err; |
2f2dc053 | 1777 | } |
2f2dc053 | 1778 | |
e1518c7c SW |
1779 | out: |
1780 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
1781 | dout("do_request %p done, result %d\n", req, err); |
1782 | return err; | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * Handle mds reply. | |
1787 | * | |
1788 | * We take the session mutex and parse and process the reply immediately. | |
1789 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
1790 | * by the MDS as they are applied to our local cache. | |
1791 | */ | |
1792 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
1793 | { | |
1794 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
1795 | struct ceph_mds_request *req; | |
1796 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
1797 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
1798 | u64 tid; | |
1799 | int err, result; | |
2600d2dd | 1800 | int mds = session->s_mds; |
2f2dc053 | 1801 | |
2f2dc053 SW |
1802 | if (msg->front.iov_len < sizeof(*head)) { |
1803 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 1804 | ceph_msg_dump(msg); |
2f2dc053 SW |
1805 | return; |
1806 | } | |
1807 | ||
1808 | /* get request, session */ | |
6df058c0 | 1809 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
1810 | mutex_lock(&mdsc->mutex); |
1811 | req = __lookup_request(mdsc, tid); | |
1812 | if (!req) { | |
1813 | dout("handle_reply on unknown tid %llu\n", tid); | |
1814 | mutex_unlock(&mdsc->mutex); | |
1815 | return; | |
1816 | } | |
1817 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
1818 | |
1819 | /* correct session? */ | |
d96d6049 | 1820 | if (req->r_session != session) { |
2f2dc053 SW |
1821 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
1822 | " not mds%d\n", tid, session->s_mds, | |
1823 | req->r_session ? req->r_session->s_mds : -1); | |
1824 | mutex_unlock(&mdsc->mutex); | |
1825 | goto out; | |
1826 | } | |
1827 | ||
1828 | /* dup? */ | |
1829 | if ((req->r_got_unsafe && !head->safe) || | |
1830 | (req->r_got_safe && head->safe)) { | |
1831 | pr_warning("got a dup %s reply on %llu from mds%d\n", | |
1832 | head->safe ? "safe" : "unsafe", tid, mds); | |
1833 | mutex_unlock(&mdsc->mutex); | |
1834 | goto out; | |
1835 | } | |
1836 | ||
1837 | result = le32_to_cpu(head->result); | |
1838 | ||
1839 | /* | |
1840 | * Tolerate 2 consecutive ESTALEs from the same mds. | |
1841 | * FIXME: we should be looking at the cap migrate_seq. | |
1842 | */ | |
1843 | if (result == -ESTALE) { | |
1844 | req->r_direct_mode = USE_AUTH_MDS; | |
1845 | req->r_num_stale++; | |
1846 | if (req->r_num_stale <= 2) { | |
1847 | __do_request(mdsc, req); | |
1848 | mutex_unlock(&mdsc->mutex); | |
1849 | goto out; | |
1850 | } | |
1851 | } else { | |
1852 | req->r_num_stale = 0; | |
1853 | } | |
1854 | ||
1855 | if (head->safe) { | |
1856 | req->r_got_safe = true; | |
1857 | __unregister_request(mdsc, req); | |
1858 | complete(&req->r_safe_completion); | |
1859 | ||
1860 | if (req->r_got_unsafe) { | |
1861 | /* | |
1862 | * We already handled the unsafe response, now do the | |
1863 | * cleanup. No need to examine the response; the MDS | |
1864 | * doesn't include any result info in the safe | |
1865 | * response. And even if it did, there is nothing | |
1866 | * useful we could do with a revised return value. | |
1867 | */ | |
1868 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
1869 | list_del_init(&req->r_unsafe_item); | |
1870 | ||
1871 | /* last unsafe request during umount? */ | |
44ca18f2 | 1872 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
2f2dc053 SW |
1873 | complete(&mdsc->safe_umount_waiters); |
1874 | mutex_unlock(&mdsc->mutex); | |
1875 | goto out; | |
1876 | } | |
e1518c7c | 1877 | } else { |
2f2dc053 SW |
1878 | req->r_got_unsafe = true; |
1879 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
1880 | } | |
1881 | ||
1882 | dout("handle_reply tid %lld result %d\n", tid, result); | |
1883 | rinfo = &req->r_reply_info; | |
1884 | err = parse_reply_info(msg, rinfo); | |
1885 | mutex_unlock(&mdsc->mutex); | |
1886 | ||
1887 | mutex_lock(&session->s_mutex); | |
1888 | if (err < 0) { | |
1889 | pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds); | |
9ec7cab1 | 1890 | ceph_msg_dump(msg); |
2f2dc053 SW |
1891 | goto out_err; |
1892 | } | |
1893 | ||
1894 | /* snap trace */ | |
1895 | if (rinfo->snapblob_len) { | |
1896 | down_write(&mdsc->snap_rwsem); | |
1897 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
1898 | rinfo->snapblob + rinfo->snapblob_len, | |
1899 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
1900 | downgrade_write(&mdsc->snap_rwsem); | |
1901 | } else { | |
1902 | down_read(&mdsc->snap_rwsem); | |
1903 | } | |
1904 | ||
1905 | /* insert trace into our cache */ | |
b4556396 | 1906 | mutex_lock(&req->r_fill_mutex); |
2f2dc053 SW |
1907 | err = ceph_fill_trace(mdsc->client->sb, req, req->r_session); |
1908 | if (err == 0) { | |
1909 | if (result == 0 && rinfo->dir_nr) | |
1910 | ceph_readdir_prepopulate(req, req->r_session); | |
1911 | ceph_unreserve_caps(&req->r_caps_reservation); | |
1912 | } | |
b4556396 | 1913 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
1914 | |
1915 | up_read(&mdsc->snap_rwsem); | |
1916 | out_err: | |
e1518c7c SW |
1917 | mutex_lock(&mdsc->mutex); |
1918 | if (!req->r_aborted) { | |
1919 | if (err) { | |
1920 | req->r_err = err; | |
1921 | } else { | |
1922 | req->r_reply = msg; | |
1923 | ceph_msg_get(msg); | |
1924 | req->r_got_result = true; | |
1925 | } | |
2f2dc053 | 1926 | } else { |
e1518c7c | 1927 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 1928 | } |
e1518c7c | 1929 | mutex_unlock(&mdsc->mutex); |
2f2dc053 SW |
1930 | |
1931 | add_cap_releases(mdsc, req->r_session, -1); | |
1932 | mutex_unlock(&session->s_mutex); | |
1933 | ||
1934 | /* kick calling process */ | |
1935 | complete_request(mdsc, req); | |
1936 | out: | |
1937 | ceph_mdsc_put_request(req); | |
1938 | return; | |
1939 | } | |
1940 | ||
1941 | ||
1942 | ||
1943 | /* | |
1944 | * handle mds notification that our request has been forwarded. | |
1945 | */ | |
2600d2dd SW |
1946 | static void handle_forward(struct ceph_mds_client *mdsc, |
1947 | struct ceph_mds_session *session, | |
1948 | struct ceph_msg *msg) | |
2f2dc053 SW |
1949 | { |
1950 | struct ceph_mds_request *req; | |
a1ea787c | 1951 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
1952 | u32 next_mds; |
1953 | u32 fwd_seq; | |
2f2dc053 SW |
1954 | int err = -EINVAL; |
1955 | void *p = msg->front.iov_base; | |
1956 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 1957 | |
a1ea787c | 1958 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
1959 | next_mds = ceph_decode_32(&p); |
1960 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
1961 | |
1962 | mutex_lock(&mdsc->mutex); | |
1963 | req = __lookup_request(mdsc, tid); | |
1964 | if (!req) { | |
080af17e | 1965 | dout("forward %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
1966 | goto out; /* dup reply? */ |
1967 | } | |
1968 | ||
2f2dc053 SW |
1969 | if (fwd_seq <= req->r_num_fwd) { |
1970 | dout("forward %llu to mds%d - old seq %d <= %d\n", | |
1971 | tid, next_mds, req->r_num_fwd, fwd_seq); | |
1972 | } else { | |
1973 | /* resend. forward race not possible; mds would drop */ | |
1974 | dout("forward %llu to mds%d (we resend)\n", tid, next_mds); | |
1975 | req->r_num_fwd = fwd_seq; | |
1976 | req->r_resend_mds = next_mds; | |
1977 | put_request_session(req); | |
1978 | __do_request(mdsc, req); | |
1979 | } | |
1980 | ceph_mdsc_put_request(req); | |
1981 | out: | |
1982 | mutex_unlock(&mdsc->mutex); | |
1983 | return; | |
1984 | ||
1985 | bad: | |
1986 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
1987 | } | |
1988 | ||
1989 | /* | |
1990 | * handle a mds session control message | |
1991 | */ | |
1992 | static void handle_session(struct ceph_mds_session *session, | |
1993 | struct ceph_msg *msg) | |
1994 | { | |
1995 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
1996 | u32 op; | |
1997 | u64 seq; | |
2600d2dd | 1998 | int mds = session->s_mds; |
2f2dc053 SW |
1999 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2000 | int wake = 0; | |
2001 | ||
2f2dc053 SW |
2002 | /* decode */ |
2003 | if (msg->front.iov_len != sizeof(*h)) | |
2004 | goto bad; | |
2005 | op = le32_to_cpu(h->op); | |
2006 | seq = le64_to_cpu(h->seq); | |
2007 | ||
2008 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2009 | if (op == CEPH_SESSION_CLOSE) |
2010 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2011 | /* FIXME: this ttl calculation is generous */ |
2012 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2013 | mutex_unlock(&mdsc->mutex); | |
2014 | ||
2015 | mutex_lock(&session->s_mutex); | |
2016 | ||
2017 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2018 | mds, ceph_session_op_name(op), session, | |
2019 | session_state_name(session->s_state), seq); | |
2020 | ||
2021 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2022 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2023 | pr_info("mds%d came back\n", session->s_mds); | |
2024 | } | |
2025 | ||
2026 | switch (op) { | |
2027 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2028 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2029 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2030 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2031 | renewed_caps(mdsc, session, 0); | |
2032 | wake = 1; | |
2033 | if (mdsc->stopping) | |
2034 | __close_session(mdsc, session); | |
2035 | break; | |
2036 | ||
2037 | case CEPH_SESSION_RENEWCAPS: | |
2038 | if (session->s_renew_seq == seq) | |
2039 | renewed_caps(mdsc, session, 1); | |
2040 | break; | |
2041 | ||
2042 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2043 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2044 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 SW |
2045 | remove_session_caps(session); |
2046 | wake = 1; /* for good measure */ | |
2047 | complete(&mdsc->session_close_waiters); | |
29790f26 | 2048 | kick_requests(mdsc, mds); |
2f2dc053 SW |
2049 | break; |
2050 | ||
2051 | case CEPH_SESSION_STALE: | |
2052 | pr_info("mds%d caps went stale, renewing\n", | |
2053 | session->s_mds); | |
2054 | spin_lock(&session->s_cap_lock); | |
2055 | session->s_cap_gen++; | |
2056 | session->s_cap_ttl = 0; | |
2057 | spin_unlock(&session->s_cap_lock); | |
2058 | send_renew_caps(mdsc, session); | |
2059 | break; | |
2060 | ||
2061 | case CEPH_SESSION_RECALL_STATE: | |
2062 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2063 | break; | |
2064 | ||
2065 | default: | |
2066 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2067 | WARN_ON(1); | |
2068 | } | |
2069 | ||
2070 | mutex_unlock(&session->s_mutex); | |
2071 | if (wake) { | |
2072 | mutex_lock(&mdsc->mutex); | |
2073 | __wake_requests(mdsc, &session->s_waiting); | |
2074 | mutex_unlock(&mdsc->mutex); | |
2075 | } | |
2076 | return; | |
2077 | ||
2078 | bad: | |
2079 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2080 | (int)msg->front.iov_len); | |
9ec7cab1 | 2081 | ceph_msg_dump(msg); |
2f2dc053 SW |
2082 | return; |
2083 | } | |
2084 | ||
2085 | ||
2086 | /* | |
2087 | * called under session->mutex. | |
2088 | */ | |
2089 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2090 | struct ceph_mds_session *session) | |
2091 | { | |
2092 | struct ceph_mds_request *req, *nreq; | |
2093 | int err; | |
2094 | ||
2095 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2096 | ||
2097 | mutex_lock(&mdsc->mutex); | |
2098 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2099 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2100 | if (!err) { | |
2101 | ceph_msg_get(req->r_request); | |
2102 | ceph_con_send(&session->s_con, req->r_request); | |
2103 | } | |
2104 | } | |
2105 | mutex_unlock(&mdsc->mutex); | |
2106 | } | |
2107 | ||
2108 | /* | |
2109 | * Encode information about a cap for a reconnect with the MDS. | |
2110 | */ | |
2f2dc053 SW |
2111 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2112 | void *arg) | |
2113 | { | |
93cea5be | 2114 | struct ceph_mds_cap_reconnect rec; |
2f2dc053 | 2115 | struct ceph_inode_info *ci; |
93cea5be | 2116 | struct ceph_pagelist *pagelist = arg; |
2f2dc053 SW |
2117 | char *path; |
2118 | int pathlen, err; | |
2119 | u64 pathbase; | |
2120 | struct dentry *dentry; | |
2121 | ||
2122 | ci = cap->ci; | |
2123 | ||
2124 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2125 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2126 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2127 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2128 | if (err) | |
2129 | return err; | |
2f2dc053 SW |
2130 | |
2131 | dentry = d_find_alias(inode); | |
2132 | if (dentry) { | |
2133 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2134 | if (IS_ERR(path)) { | |
2135 | err = PTR_ERR(path); | |
2136 | BUG_ON(err); | |
2137 | } | |
2138 | } else { | |
2139 | path = NULL; | |
2140 | pathlen = 0; | |
2141 | } | |
93cea5be SW |
2142 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2143 | if (err) | |
2144 | goto out; | |
2f2dc053 | 2145 | |
2f2dc053 SW |
2146 | spin_lock(&inode->i_lock); |
2147 | cap->seq = 0; /* reset cap seq */ | |
2148 | cap->issue_seq = 0; /* and issue_seq */ | |
93cea5be SW |
2149 | rec.cap_id = cpu_to_le64(cap->cap_id); |
2150 | rec.pathbase = cpu_to_le64(pathbase); | |
2151 | rec.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2152 | rec.issued = cpu_to_le32(cap->issued); | |
2153 | rec.size = cpu_to_le64(inode->i_size); | |
2154 | ceph_encode_timespec(&rec.mtime, &inode->i_mtime); | |
2155 | ceph_encode_timespec(&rec.atime, &inode->i_atime); | |
2156 | rec.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2f2dc053 SW |
2157 | spin_unlock(&inode->i_lock); |
2158 | ||
93cea5be SW |
2159 | err = ceph_pagelist_append(pagelist, &rec, sizeof(rec)); |
2160 | ||
2161 | out: | |
2f2dc053 SW |
2162 | kfree(path); |
2163 | dput(dentry); | |
93cea5be | 2164 | return err; |
2f2dc053 SW |
2165 | } |
2166 | ||
2167 | ||
2168 | /* | |
2169 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2170 | * reestablish shared state. This includes all caps issued through | |
2171 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2172 | * clear which snap realms the mds cares about, we send everything we | |
2173 | * know about.. that ensures we'll then get any new info the | |
2174 | * recovering MDS might have. | |
2175 | * | |
2176 | * This is a relatively heavyweight operation, but it's rare. | |
2177 | * | |
2178 | * called with mdsc->mutex held. | |
2179 | */ | |
2180 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, int mds) | |
2181 | { | |
93cea5be | 2182 | struct ceph_mds_session *session = NULL; |
2f2dc053 | 2183 | struct ceph_msg *reply; |
a105f00c | 2184 | struct rb_node *p; |
9abf82b8 | 2185 | int err = -ENOMEM; |
93cea5be | 2186 | struct ceph_pagelist *pagelist; |
2f2dc053 SW |
2187 | |
2188 | pr_info("reconnect to recovering mds%d\n", mds); | |
2189 | ||
93cea5be SW |
2190 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2191 | if (!pagelist) | |
2192 | goto fail_nopagelist; | |
2193 | ceph_pagelist_init(pagelist); | |
2194 | ||
a79832f2 | 2195 | err = -ENOMEM; |
bb257664 | 2196 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0); |
a79832f2 | 2197 | if (!reply) |
93cea5be | 2198 | goto fail_nomsg; |
93cea5be | 2199 | |
2f2dc053 SW |
2200 | /* find session */ |
2201 | session = __ceph_lookup_mds_session(mdsc, mds); | |
2202 | mutex_unlock(&mdsc->mutex); /* drop lock for duration */ | |
2203 | ||
2204 | if (session) { | |
2205 | mutex_lock(&session->s_mutex); | |
2206 | ||
2207 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2208 | session->s_seq = 0; | |
2209 | ||
2210 | ceph_con_open(&session->s_con, | |
2211 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
2212 | ||
2213 | /* replay unsafe requests */ | |
2214 | replay_unsafe_requests(mdsc, session); | |
2f2dc053 SW |
2215 | } else { |
2216 | dout("no session for mds%d, will send short reconnect\n", | |
2217 | mds); | |
2218 | } | |
2219 | ||
2220 | down_read(&mdsc->snap_rwsem); | |
2221 | ||
93cea5be | 2222 | if (!session) |
2f2dc053 | 2223 | goto send; |
2f2dc053 SW |
2224 | dout("session %p state %s\n", session, |
2225 | session_state_name(session->s_state)); | |
2226 | ||
e01a5946 SW |
2227 | /* drop old cap expires; we're about to reestablish that state */ |
2228 | discard_cap_releases(mdsc, session); | |
2229 | ||
2f2dc053 | 2230 | /* traverse this session's caps */ |
93cea5be SW |
2231 | err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps); |
2232 | if (err) | |
2233 | goto fail; | |
2234 | err = iterate_session_caps(session, encode_caps_cb, pagelist); | |
2f2dc053 | 2235 | if (err < 0) |
9abf82b8 | 2236 | goto fail; |
2f2dc053 SW |
2237 | |
2238 | /* | |
2239 | * snaprealms. we provide mds with the ino, seq (version), and | |
2240 | * parent for all of our realms. If the mds has any newer info, | |
2241 | * it will tell us. | |
2242 | */ | |
a105f00c SW |
2243 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2244 | struct ceph_snap_realm *realm = | |
2245 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2246 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2247 | |
2248 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2249 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2250 | sr_rec.ino = cpu_to_le64(realm->ino); |
2251 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2252 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2253 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2254 | if (err) | |
2255 | goto fail; | |
2f2dc053 | 2256 | } |
2f2dc053 SW |
2257 | |
2258 | send: | |
93cea5be SW |
2259 | reply->pagelist = pagelist; |
2260 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
2261 | reply->nr_pages = calc_pages_for(0, pagelist->length); | |
2f2dc053 SW |
2262 | ceph_con_send(&session->s_con, reply); |
2263 | ||
9abf82b8 SW |
2264 | mutex_unlock(&session->s_mutex); |
2265 | ||
2266 | mutex_lock(&mdsc->mutex); | |
2267 | __wake_requests(mdsc, &session->s_waiting); | |
2268 | mutex_unlock(&mdsc->mutex); | |
2269 | ||
2270 | ceph_put_mds_session(session); | |
2f2dc053 | 2271 | |
2f2dc053 | 2272 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2273 | mutex_lock(&mdsc->mutex); |
2274 | return; | |
2275 | ||
93cea5be | 2276 | fail: |
2f2dc053 | 2277 | ceph_msg_put(reply); |
9abf82b8 SW |
2278 | up_read(&mdsc->snap_rwsem); |
2279 | mutex_unlock(&session->s_mutex); | |
2280 | ceph_put_mds_session(session); | |
93cea5be SW |
2281 | fail_nomsg: |
2282 | ceph_pagelist_release(pagelist); | |
2283 | kfree(pagelist); | |
2284 | fail_nopagelist: | |
9abf82b8 SW |
2285 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
2286 | mutex_lock(&mdsc->mutex); | |
2287 | return; | |
2f2dc053 SW |
2288 | } |
2289 | ||
2290 | ||
2291 | /* | |
2292 | * compare old and new mdsmaps, kicking requests | |
2293 | * and closing out old connections as necessary | |
2294 | * | |
2295 | * called under mdsc->mutex. | |
2296 | */ | |
2297 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2298 | struct ceph_mdsmap *newmap, | |
2299 | struct ceph_mdsmap *oldmap) | |
2300 | { | |
2301 | int i; | |
2302 | int oldstate, newstate; | |
2303 | struct ceph_mds_session *s; | |
2304 | ||
2305 | dout("check_new_map new %u old %u\n", | |
2306 | newmap->m_epoch, oldmap->m_epoch); | |
2307 | ||
2308 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2309 | if (mdsc->sessions[i] == NULL) | |
2310 | continue; | |
2311 | s = mdsc->sessions[i]; | |
2312 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2313 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2314 | ||
2315 | dout("check_new_map mds%d state %s -> %s (session %s)\n", | |
2316 | i, ceph_mds_state_name(oldstate), | |
2317 | ceph_mds_state_name(newstate), | |
2318 | session_state_name(s->s_state)); | |
2319 | ||
2320 | if (memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2321 | ceph_mdsmap_get_addr(newmap, i), | |
2322 | sizeof(struct ceph_entity_addr))) { | |
2323 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2324 | /* the session never opened, just close it | |
2325 | * out now */ | |
2326 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2327 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2328 | } else { |
2329 | /* just close it */ | |
2330 | mutex_unlock(&mdsc->mutex); | |
2331 | mutex_lock(&s->s_mutex); | |
2332 | mutex_lock(&mdsc->mutex); | |
2333 | ceph_con_close(&s->s_con); | |
2334 | mutex_unlock(&s->s_mutex); | |
2335 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2336 | } | |
2337 | ||
2338 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2339 | kick_requests(mdsc, i); |
2f2dc053 SW |
2340 | } else if (oldstate == newstate) { |
2341 | continue; /* nothing new with this mds */ | |
2342 | } | |
2343 | ||
2344 | /* | |
2345 | * send reconnect? | |
2346 | */ | |
2347 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
2348 | newstate >= CEPH_MDS_STATE_RECONNECT) | |
2349 | send_mds_reconnect(mdsc, i); | |
2350 | ||
2351 | /* | |
29790f26 | 2352 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2353 | */ |
2354 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2355 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2356 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2357 | oldstate != CEPH_MDS_STATE_STARTING) | |
2358 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2359 | kick_requests(mdsc, i); | |
2f2dc053 | 2360 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2361 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2362 | } |
2363 | } | |
2364 | } | |
2365 | ||
2366 | ||
2367 | ||
2368 | /* | |
2369 | * leases | |
2370 | */ | |
2371 | ||
2372 | /* | |
2373 | * caller must hold session s_mutex, dentry->d_lock | |
2374 | */ | |
2375 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2376 | { | |
2377 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2378 | ||
2379 | ceph_put_mds_session(di->lease_session); | |
2380 | di->lease_session = NULL; | |
2381 | } | |
2382 | ||
2600d2dd SW |
2383 | static void handle_lease(struct ceph_mds_client *mdsc, |
2384 | struct ceph_mds_session *session, | |
2385 | struct ceph_msg *msg) | |
2f2dc053 SW |
2386 | { |
2387 | struct super_block *sb = mdsc->client->sb; | |
2388 | struct inode *inode; | |
2f2dc053 SW |
2389 | struct ceph_inode_info *ci; |
2390 | struct dentry *parent, *dentry; | |
2391 | struct ceph_dentry_info *di; | |
2600d2dd | 2392 | int mds = session->s_mds; |
2f2dc053 SW |
2393 | struct ceph_mds_lease *h = msg->front.iov_base; |
2394 | struct ceph_vino vino; | |
2395 | int mask; | |
2396 | struct qstr dname; | |
2397 | int release = 0; | |
2398 | ||
2f2dc053 SW |
2399 | dout("handle_lease from mds%d\n", mds); |
2400 | ||
2401 | /* decode */ | |
2402 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
2403 | goto bad; | |
2404 | vino.ino = le64_to_cpu(h->ino); | |
2405 | vino.snap = CEPH_NOSNAP; | |
2406 | mask = le16_to_cpu(h->mask); | |
2407 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); | |
2408 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
2409 | if (dname.len != get_unaligned_le32(h+1)) | |
2410 | goto bad; | |
2411 | ||
2f2dc053 SW |
2412 | mutex_lock(&session->s_mutex); |
2413 | session->s_seq++; | |
2414 | ||
2415 | /* lookup inode */ | |
2416 | inode = ceph_find_inode(sb, vino); | |
2417 | dout("handle_lease '%s', mask %d, ino %llx %p\n", | |
2418 | ceph_lease_op_name(h->action), mask, vino.ino, inode); | |
2419 | if (inode == NULL) { | |
2420 | dout("handle_lease no inode %llx\n", vino.ino); | |
2421 | goto release; | |
2422 | } | |
2423 | ci = ceph_inode(inode); | |
2424 | ||
2425 | /* dentry */ | |
2426 | parent = d_find_alias(inode); | |
2427 | if (!parent) { | |
2428 | dout("no parent dentry on inode %p\n", inode); | |
2429 | WARN_ON(1); | |
2430 | goto release; /* hrm... */ | |
2431 | } | |
2432 | dname.hash = full_name_hash(dname.name, dname.len); | |
2433 | dentry = d_lookup(parent, &dname); | |
2434 | dput(parent); | |
2435 | if (!dentry) | |
2436 | goto release; | |
2437 | ||
2438 | spin_lock(&dentry->d_lock); | |
2439 | di = ceph_dentry(dentry); | |
2440 | switch (h->action) { | |
2441 | case CEPH_MDS_LEASE_REVOKE: | |
2442 | if (di && di->lease_session == session) { | |
2443 | h->seq = cpu_to_le32(di->lease_seq); | |
2444 | __ceph_mdsc_drop_dentry_lease(dentry); | |
2445 | } | |
2446 | release = 1; | |
2447 | break; | |
2448 | ||
2449 | case CEPH_MDS_LEASE_RENEW: | |
2450 | if (di && di->lease_session == session && | |
2451 | di->lease_gen == session->s_cap_gen && | |
2452 | di->lease_renew_from && | |
2453 | di->lease_renew_after == 0) { | |
2454 | unsigned long duration = | |
2455 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
2456 | ||
2457 | di->lease_seq = le32_to_cpu(h->seq); | |
2458 | dentry->d_time = di->lease_renew_from + duration; | |
2459 | di->lease_renew_after = di->lease_renew_from + | |
2460 | (duration >> 1); | |
2461 | di->lease_renew_from = 0; | |
2462 | } | |
2463 | break; | |
2464 | } | |
2465 | spin_unlock(&dentry->d_lock); | |
2466 | dput(dentry); | |
2467 | ||
2468 | if (!release) | |
2469 | goto out; | |
2470 | ||
2471 | release: | |
2472 | /* let's just reuse the same message */ | |
2473 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
2474 | ceph_msg_get(msg); | |
2475 | ceph_con_send(&session->s_con, msg); | |
2476 | ||
2477 | out: | |
2478 | iput(inode); | |
2479 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
2480 | return; |
2481 | ||
2482 | bad: | |
2483 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 2484 | ceph_msg_dump(msg); |
2f2dc053 SW |
2485 | } |
2486 | ||
2487 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
2488 | struct inode *inode, | |
2489 | struct dentry *dentry, char action, | |
2490 | u32 seq) | |
2491 | { | |
2492 | struct ceph_msg *msg; | |
2493 | struct ceph_mds_lease *lease; | |
2494 | int len = sizeof(*lease) + sizeof(u32); | |
2495 | int dnamelen = 0; | |
2496 | ||
2497 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
2498 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
2499 | dnamelen = dentry->d_name.len; | |
2500 | len += dnamelen; | |
2501 | ||
bb257664 | 2502 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len); |
a79832f2 | 2503 | if (!msg) |
2f2dc053 SW |
2504 | return; |
2505 | lease = msg->front.iov_base; | |
2506 | lease->action = action; | |
2507 | lease->mask = cpu_to_le16(CEPH_LOCK_DN); | |
2508 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); | |
2509 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
2510 | lease->seq = cpu_to_le32(seq); | |
2511 | put_unaligned_le32(dnamelen, lease + 1); | |
2512 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
2513 | ||
2514 | /* | |
2515 | * if this is a preemptive lease RELEASE, no need to | |
2516 | * flush request stream, since the actual request will | |
2517 | * soon follow. | |
2518 | */ | |
2519 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
2520 | ||
2521 | ceph_con_send(&session->s_con, msg); | |
2522 | } | |
2523 | ||
2524 | /* | |
2525 | * Preemptively release a lease we expect to invalidate anyway. | |
2526 | * Pass @inode always, @dentry is optional. | |
2527 | */ | |
2528 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2529 | struct dentry *dentry, int mask) | |
2530 | { | |
2531 | struct ceph_dentry_info *di; | |
2532 | struct ceph_mds_session *session; | |
2533 | u32 seq; | |
2534 | ||
2535 | BUG_ON(inode == NULL); | |
2536 | BUG_ON(dentry == NULL); | |
2537 | BUG_ON(mask != CEPH_LOCK_DN); | |
2538 | ||
2539 | /* is dentry lease valid? */ | |
2540 | spin_lock(&dentry->d_lock); | |
2541 | di = ceph_dentry(dentry); | |
2542 | if (!di || !di->lease_session || | |
2543 | di->lease_session->s_mds < 0 || | |
2544 | di->lease_gen != di->lease_session->s_cap_gen || | |
2545 | !time_before(jiffies, dentry->d_time)) { | |
2546 | dout("lease_release inode %p dentry %p -- " | |
2547 | "no lease on %d\n", | |
2548 | inode, dentry, mask); | |
2549 | spin_unlock(&dentry->d_lock); | |
2550 | return; | |
2551 | } | |
2552 | ||
2553 | /* we do have a lease on this dentry; note mds and seq */ | |
2554 | session = ceph_get_mds_session(di->lease_session); | |
2555 | seq = di->lease_seq; | |
2556 | __ceph_mdsc_drop_dentry_lease(dentry); | |
2557 | spin_unlock(&dentry->d_lock); | |
2558 | ||
2559 | dout("lease_release inode %p dentry %p mask %d to mds%d\n", | |
2560 | inode, dentry, mask, session->s_mds); | |
2561 | ceph_mdsc_lease_send_msg(session, inode, dentry, | |
2562 | CEPH_MDS_LEASE_RELEASE, seq); | |
2563 | ceph_put_mds_session(session); | |
2564 | } | |
2565 | ||
2566 | /* | |
2567 | * drop all leases (and dentry refs) in preparation for umount | |
2568 | */ | |
2569 | static void drop_leases(struct ceph_mds_client *mdsc) | |
2570 | { | |
2571 | int i; | |
2572 | ||
2573 | dout("drop_leases\n"); | |
2574 | mutex_lock(&mdsc->mutex); | |
2575 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2576 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
2577 | if (!s) | |
2578 | continue; | |
2579 | mutex_unlock(&mdsc->mutex); | |
2580 | mutex_lock(&s->s_mutex); | |
2581 | mutex_unlock(&s->s_mutex); | |
2582 | ceph_put_mds_session(s); | |
2583 | mutex_lock(&mdsc->mutex); | |
2584 | } | |
2585 | mutex_unlock(&mdsc->mutex); | |
2586 | } | |
2587 | ||
2588 | ||
2589 | ||
2590 | /* | |
2591 | * delayed work -- periodically trim expired leases, renew caps with mds | |
2592 | */ | |
2593 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
2594 | { | |
2595 | int delay = 5; | |
2596 | unsigned hz = round_jiffies_relative(HZ * delay); | |
2597 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
2598 | } | |
2599 | ||
2600 | static void delayed_work(struct work_struct *work) | |
2601 | { | |
2602 | int i; | |
2603 | struct ceph_mds_client *mdsc = | |
2604 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
2605 | int renew_interval; | |
2606 | int renew_caps; | |
2607 | ||
2608 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 2609 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
2610 | |
2611 | mutex_lock(&mdsc->mutex); | |
2612 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
2613 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
2614 | mdsc->last_renew_caps); | |
2615 | if (renew_caps) | |
2616 | mdsc->last_renew_caps = jiffies; | |
2617 | ||
2618 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2619 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
2620 | if (s == NULL) | |
2621 | continue; | |
2622 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2623 | dout("resending session close request for mds%d\n", | |
2624 | s->s_mds); | |
2625 | request_close_session(mdsc, s); | |
2626 | ceph_put_mds_session(s); | |
2627 | continue; | |
2628 | } | |
2629 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
2630 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
2631 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
2632 | pr_info("mds%d hung\n", s->s_mds); | |
2633 | } | |
2634 | } | |
2635 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
2636 | /* this mds is failed or recovering, just wait */ | |
2637 | ceph_put_mds_session(s); | |
2638 | continue; | |
2639 | } | |
2640 | mutex_unlock(&mdsc->mutex); | |
2641 | ||
2642 | mutex_lock(&s->s_mutex); | |
2643 | if (renew_caps) | |
2644 | send_renew_caps(mdsc, s); | |
2645 | else | |
2646 | ceph_con_keepalive(&s->s_con); | |
2647 | add_cap_releases(mdsc, s, -1); | |
aab53dd9 SW |
2648 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
2649 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
2650 | send_cap_releases(mdsc, s); | |
2f2dc053 SW |
2651 | mutex_unlock(&s->s_mutex); |
2652 | ceph_put_mds_session(s); | |
2653 | ||
2654 | mutex_lock(&mdsc->mutex); | |
2655 | } | |
2656 | mutex_unlock(&mdsc->mutex); | |
2657 | ||
2658 | schedule_delayed(mdsc); | |
2659 | } | |
2660 | ||
2661 | ||
5f44f142 | 2662 | int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client) |
2f2dc053 SW |
2663 | { |
2664 | mdsc->client = client; | |
2665 | mutex_init(&mdsc->mutex); | |
2666 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
2d06eeb8 CR |
2667 | if (mdsc->mdsmap == NULL) |
2668 | return -ENOMEM; | |
2669 | ||
2f2dc053 SW |
2670 | init_completion(&mdsc->safe_umount_waiters); |
2671 | init_completion(&mdsc->session_close_waiters); | |
2672 | INIT_LIST_HEAD(&mdsc->waiting_for_map); | |
2673 | mdsc->sessions = NULL; | |
2674 | mdsc->max_sessions = 0; | |
2675 | mdsc->stopping = 0; | |
2676 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 2677 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
2678 | INIT_LIST_HEAD(&mdsc->snap_empty); |
2679 | spin_lock_init(&mdsc->snap_empty_lock); | |
2680 | mdsc->last_tid = 0; | |
44ca18f2 | 2681 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
2682 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
2683 | mdsc->last_renew_caps = jiffies; | |
2684 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
2685 | spin_lock_init(&mdsc->cap_delay_lock); | |
2686 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
2687 | spin_lock_init(&mdsc->snap_flush_lock); | |
2688 | mdsc->cap_flush_seq = 0; | |
2689 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
2690 | mdsc->num_cap_flushing = 0; | |
2691 | spin_lock_init(&mdsc->cap_dirty_lock); | |
2692 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
2693 | spin_lock_init(&mdsc->dentry_lru_lock); | |
2694 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 2695 | |
5f44f142 | 2696 | return 0; |
2f2dc053 SW |
2697 | } |
2698 | ||
2699 | /* | |
2700 | * Wait for safe replies on open mds requests. If we time out, drop | |
2701 | * all requests from the tree to avoid dangling dentry refs. | |
2702 | */ | |
2703 | static void wait_requests(struct ceph_mds_client *mdsc) | |
2704 | { | |
2705 | struct ceph_mds_request *req; | |
2706 | struct ceph_client *client = mdsc->client; | |
2707 | ||
2708 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 2709 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 2710 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 2711 | |
2f2dc053 SW |
2712 | dout("wait_requests waiting for requests\n"); |
2713 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
6b805185 | 2714 | client->mount_args->mount_timeout * HZ); |
2f2dc053 SW |
2715 | |
2716 | /* tear down remaining requests */ | |
44ca18f2 SW |
2717 | mutex_lock(&mdsc->mutex); |
2718 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
2719 | dout("wait_requests timed out on tid %llu\n", |
2720 | req->r_tid); | |
44ca18f2 | 2721 | __unregister_request(mdsc, req); |
2f2dc053 SW |
2722 | } |
2723 | } | |
2724 | mutex_unlock(&mdsc->mutex); | |
2725 | dout("wait_requests done\n"); | |
2726 | } | |
2727 | ||
2728 | /* | |
2729 | * called before mount is ro, and before dentries are torn down. | |
2730 | * (hmm, does this still race with new lookups?) | |
2731 | */ | |
2732 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
2733 | { | |
2734 | dout("pre_umount\n"); | |
2735 | mdsc->stopping = 1; | |
2736 | ||
2737 | drop_leases(mdsc); | |
afcdaea3 | 2738 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
2739 | wait_requests(mdsc); |
2740 | } | |
2741 | ||
2742 | /* | |
2743 | * wait for all write mds requests to flush. | |
2744 | */ | |
2745 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
2746 | { | |
80fc7314 | 2747 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 2748 | struct rb_node *n; |
2f2dc053 SW |
2749 | |
2750 | mutex_lock(&mdsc->mutex); | |
2751 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 2752 | restart: |
44ca18f2 SW |
2753 | req = __get_oldest_req(mdsc); |
2754 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
2755 | /* find next request */ |
2756 | n = rb_next(&req->r_node); | |
2757 | if (n) | |
2758 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
2759 | else | |
2760 | nextreq = NULL; | |
44ca18f2 SW |
2761 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
2762 | /* write op */ | |
2763 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
2764 | if (nextreq) |
2765 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
2766 | mutex_unlock(&mdsc->mutex); |
2767 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
2768 | req->r_tid, want_tid); | |
2769 | wait_for_completion(&req->r_safe_completion); | |
2770 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 2771 | ceph_mdsc_put_request(req); |
80fc7314 SW |
2772 | if (!nextreq) |
2773 | break; /* next dne before, so we're done! */ | |
2774 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
2775 | /* next request was removed from tree */ | |
2776 | ceph_mdsc_put_request(nextreq); | |
2777 | goto restart; | |
2778 | } | |
2779 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 2780 | } |
80fc7314 | 2781 | req = nextreq; |
2f2dc053 SW |
2782 | } |
2783 | mutex_unlock(&mdsc->mutex); | |
2784 | dout("wait_unsafe_requests done\n"); | |
2785 | } | |
2786 | ||
2787 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
2788 | { | |
2789 | u64 want_tid, want_flush; | |
2790 | ||
56b7cf95 SW |
2791 | if (mdsc->client->mount_state == CEPH_MOUNT_SHUTDOWN) |
2792 | return; | |
2793 | ||
2f2dc053 SW |
2794 | dout("sync\n"); |
2795 | mutex_lock(&mdsc->mutex); | |
2796 | want_tid = mdsc->last_tid; | |
2797 | want_flush = mdsc->cap_flush_seq; | |
2798 | mutex_unlock(&mdsc->mutex); | |
2799 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
2800 | ||
afcdaea3 | 2801 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
2802 | |
2803 | wait_unsafe_requests(mdsc, want_tid); | |
2804 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
2805 | } | |
2806 | ||
2807 | ||
2808 | /* | |
2809 | * called after sb is ro. | |
2810 | */ | |
2811 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
2812 | { | |
2813 | struct ceph_mds_session *session; | |
2814 | int i; | |
2815 | int n; | |
2816 | struct ceph_client *client = mdsc->client; | |
6b805185 | 2817 | unsigned long started, timeout = client->mount_args->mount_timeout * HZ; |
2f2dc053 SW |
2818 | |
2819 | dout("close_sessions\n"); | |
2820 | ||
2821 | mutex_lock(&mdsc->mutex); | |
2822 | ||
2823 | /* close sessions */ | |
2824 | started = jiffies; | |
2825 | while (time_before(jiffies, started + timeout)) { | |
2826 | dout("closing sessions\n"); | |
2827 | n = 0; | |
2828 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2829 | session = __ceph_lookup_mds_session(mdsc, i); | |
2830 | if (!session) | |
2831 | continue; | |
2832 | mutex_unlock(&mdsc->mutex); | |
2833 | mutex_lock(&session->s_mutex); | |
2834 | __close_session(mdsc, session); | |
2835 | mutex_unlock(&session->s_mutex); | |
2836 | ceph_put_mds_session(session); | |
2837 | mutex_lock(&mdsc->mutex); | |
2838 | n++; | |
2839 | } | |
2840 | if (n == 0) | |
2841 | break; | |
2842 | ||
2843 | if (client->mount_state == CEPH_MOUNT_SHUTDOWN) | |
2844 | break; | |
2845 | ||
2846 | dout("waiting for sessions to close\n"); | |
2847 | mutex_unlock(&mdsc->mutex); | |
2848 | wait_for_completion_timeout(&mdsc->session_close_waiters, | |
2849 | timeout); | |
2850 | mutex_lock(&mdsc->mutex); | |
2851 | } | |
2852 | ||
2853 | /* tear down remaining sessions */ | |
2854 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2855 | if (mdsc->sessions[i]) { | |
2856 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 2857 | __unregister_session(mdsc, session); |
2f2dc053 SW |
2858 | mutex_unlock(&mdsc->mutex); |
2859 | mutex_lock(&session->s_mutex); | |
2860 | remove_session_caps(session); | |
2861 | mutex_unlock(&session->s_mutex); | |
2862 | ceph_put_mds_session(session); | |
2863 | mutex_lock(&mdsc->mutex); | |
2864 | } | |
2865 | } | |
2866 | ||
2867 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); | |
2868 | ||
2869 | mutex_unlock(&mdsc->mutex); | |
2870 | ||
2871 | ceph_cleanup_empty_realms(mdsc); | |
2872 | ||
2873 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
2874 | ||
2875 | dout("stopped\n"); | |
2876 | } | |
2877 | ||
2878 | void ceph_mdsc_stop(struct ceph_mds_client *mdsc) | |
2879 | { | |
2880 | dout("stop\n"); | |
2881 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
2882 | if (mdsc->mdsmap) | |
2883 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
2884 | kfree(mdsc->sessions); | |
2885 | } | |
2886 | ||
2887 | ||
2888 | /* | |
2889 | * handle mds map update. | |
2890 | */ | |
2891 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
2892 | { | |
2893 | u32 epoch; | |
2894 | u32 maplen; | |
2895 | void *p = msg->front.iov_base; | |
2896 | void *end = p + msg->front.iov_len; | |
2897 | struct ceph_mdsmap *newmap, *oldmap; | |
2898 | struct ceph_fsid fsid; | |
2899 | int err = -EINVAL; | |
2900 | ||
2901 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
2902 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
0743304d SW |
2903 | if (ceph_check_fsid(mdsc->client, &fsid) < 0) |
2904 | return; | |
c89136ea SW |
2905 | epoch = ceph_decode_32(&p); |
2906 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
2907 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
2908 | ||
2909 | /* do we need it? */ | |
2910 | ceph_monc_got_mdsmap(&mdsc->client->monc, epoch); | |
2911 | mutex_lock(&mdsc->mutex); | |
2912 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
2913 | dout("handle_map epoch %u <= our %u\n", | |
2914 | epoch, mdsc->mdsmap->m_epoch); | |
2915 | mutex_unlock(&mdsc->mutex); | |
2916 | return; | |
2917 | } | |
2918 | ||
2919 | newmap = ceph_mdsmap_decode(&p, end); | |
2920 | if (IS_ERR(newmap)) { | |
2921 | err = PTR_ERR(newmap); | |
2922 | goto bad_unlock; | |
2923 | } | |
2924 | ||
2925 | /* swap into place */ | |
2926 | if (mdsc->mdsmap) { | |
2927 | oldmap = mdsc->mdsmap; | |
2928 | mdsc->mdsmap = newmap; | |
2929 | check_new_map(mdsc, newmap, oldmap); | |
2930 | ceph_mdsmap_destroy(oldmap); | |
2931 | } else { | |
2932 | mdsc->mdsmap = newmap; /* first mds map */ | |
2933 | } | |
2934 | mdsc->client->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; | |
2935 | ||
2936 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
2937 | ||
2938 | mutex_unlock(&mdsc->mutex); | |
2939 | schedule_delayed(mdsc); | |
2940 | return; | |
2941 | ||
2942 | bad_unlock: | |
2943 | mutex_unlock(&mdsc->mutex); | |
2944 | bad: | |
2945 | pr_err("error decoding mdsmap %d\n", err); | |
2946 | return; | |
2947 | } | |
2948 | ||
2949 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
2950 | { | |
2951 | struct ceph_mds_session *s = con->private; | |
2952 | ||
2953 | if (get_session(s)) { | |
2600d2dd | 2954 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
2955 | return con; |
2956 | } | |
2957 | dout("mdsc con_get %p FAIL\n", s); | |
2958 | return NULL; | |
2959 | } | |
2960 | ||
2961 | static void con_put(struct ceph_connection *con) | |
2962 | { | |
2963 | struct ceph_mds_session *s = con->private; | |
2964 | ||
2f2dc053 | 2965 | ceph_put_mds_session(s); |
2600d2dd | 2966 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
2967 | } |
2968 | ||
2969 | /* | |
2970 | * if the client is unresponsive for long enough, the mds will kill | |
2971 | * the session entirely. | |
2972 | */ | |
2973 | static void peer_reset(struct ceph_connection *con) | |
2974 | { | |
2975 | struct ceph_mds_session *s = con->private; | |
2976 | ||
2977 | pr_err("mds%d gave us the boot. IMPLEMENT RECONNECT.\n", | |
2978 | s->s_mds); | |
2979 | } | |
2980 | ||
2981 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
2982 | { | |
2983 | struct ceph_mds_session *s = con->private; | |
2984 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
2985 | int type = le16_to_cpu(msg->hdr.type); | |
2986 | ||
2600d2dd SW |
2987 | mutex_lock(&mdsc->mutex); |
2988 | if (__verify_registered_session(mdsc, s) < 0) { | |
2989 | mutex_unlock(&mdsc->mutex); | |
2990 | goto out; | |
2991 | } | |
2992 | mutex_unlock(&mdsc->mutex); | |
2993 | ||
2f2dc053 SW |
2994 | switch (type) { |
2995 | case CEPH_MSG_MDS_MAP: | |
2996 | ceph_mdsc_handle_map(mdsc, msg); | |
2997 | break; | |
2998 | case CEPH_MSG_CLIENT_SESSION: | |
2999 | handle_session(s, msg); | |
3000 | break; | |
3001 | case CEPH_MSG_CLIENT_REPLY: | |
3002 | handle_reply(s, msg); | |
3003 | break; | |
3004 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3005 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3006 | break; |
3007 | case CEPH_MSG_CLIENT_CAPS: | |
3008 | ceph_handle_caps(s, msg); | |
3009 | break; | |
3010 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3011 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3012 | break; |
3013 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3014 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3015 | break; |
3016 | ||
3017 | default: | |
3018 | pr_err("received unknown message type %d %s\n", type, | |
3019 | ceph_msg_type_name(type)); | |
3020 | } | |
2600d2dd | 3021 | out: |
2f2dc053 SW |
3022 | ceph_msg_put(msg); |
3023 | } | |
3024 | ||
4e7a5dcd SW |
3025 | /* |
3026 | * authentication | |
3027 | */ | |
3028 | static int get_authorizer(struct ceph_connection *con, | |
3029 | void **buf, int *len, int *proto, | |
3030 | void **reply_buf, int *reply_len, int force_new) | |
3031 | { | |
3032 | struct ceph_mds_session *s = con->private; | |
3033 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3034 | struct ceph_auth_client *ac = mdsc->client->monc.auth; | |
3035 | int ret = 0; | |
3036 | ||
3037 | if (force_new && s->s_authorizer) { | |
3038 | ac->ops->destroy_authorizer(ac, s->s_authorizer); | |
3039 | s->s_authorizer = NULL; | |
3040 | } | |
3041 | if (s->s_authorizer == NULL) { | |
3042 | if (ac->ops->create_authorizer) { | |
3043 | ret = ac->ops->create_authorizer( | |
3044 | ac, CEPH_ENTITY_TYPE_MDS, | |
3045 | &s->s_authorizer, | |
3046 | &s->s_authorizer_buf, | |
3047 | &s->s_authorizer_buf_len, | |
3048 | &s->s_authorizer_reply_buf, | |
3049 | &s->s_authorizer_reply_buf_len); | |
3050 | if (ret) | |
3051 | return ret; | |
3052 | } | |
3053 | } | |
3054 | ||
3055 | *proto = ac->protocol; | |
3056 | *buf = s->s_authorizer_buf; | |
3057 | *len = s->s_authorizer_buf_len; | |
3058 | *reply_buf = s->s_authorizer_reply_buf; | |
3059 | *reply_len = s->s_authorizer_reply_buf_len; | |
3060 | return 0; | |
3061 | } | |
3062 | ||
3063 | ||
3064 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3065 | { | |
3066 | struct ceph_mds_session *s = con->private; | |
3067 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3068 | struct ceph_auth_client *ac = mdsc->client->monc.auth; | |
3069 | ||
3070 | return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len); | |
3071 | } | |
3072 | ||
9bd2e6f8 SW |
3073 | static int invalidate_authorizer(struct ceph_connection *con) |
3074 | { | |
3075 | struct ceph_mds_session *s = con->private; | |
3076 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3077 | struct ceph_auth_client *ac = mdsc->client->monc.auth; | |
3078 | ||
3079 | if (ac->ops->invalidate_authorizer) | |
3080 | ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); | |
3081 | ||
3082 | return ceph_monc_validate_auth(&mdsc->client->monc); | |
3083 | } | |
3084 | ||
2f2dc053 SW |
3085 | const static struct ceph_connection_operations mds_con_ops = { |
3086 | .get = con_get, | |
3087 | .put = con_put, | |
3088 | .dispatch = dispatch, | |
4e7a5dcd SW |
3089 | .get_authorizer = get_authorizer, |
3090 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3091 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3092 | .peer_reset = peer_reset, |
2f2dc053 SW |
3093 | }; |
3094 | ||
3095 | ||
3096 | ||
3097 | ||
3098 | /* eof */ |