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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 | 2 | |
496e5955 | 3 | #include <linux/fs.h> |
2f2dc053 | 4 | #include <linux/wait.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
2f2dc053 | 6 | #include <linux/sched.h> |
3d14c5d2 YS |
7 | #include <linux/debugfs.h> |
8 | #include <linux/seq_file.h> | |
2f2dc053 | 9 | |
2f2dc053 | 10 | #include "super.h" |
3d14c5d2 YS |
11 | #include "mds_client.h" |
12 | ||
13 | #include <linux/ceph/messenger.h> | |
14 | #include <linux/ceph/decode.h> | |
15 | #include <linux/ceph/pagelist.h> | |
16 | #include <linux/ceph/auth.h> | |
17 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
18 | |
19 | /* | |
20 | * A cluster of MDS (metadata server) daemons is responsible for | |
21 | * managing the file system namespace (the directory hierarchy and | |
22 | * inodes) and for coordinating shared access to storage. Metadata is | |
23 | * partitioning hierarchically across a number of servers, and that | |
24 | * partition varies over time as the cluster adjusts the distribution | |
25 | * in order to balance load. | |
26 | * | |
27 | * The MDS client is primarily responsible to managing synchronous | |
28 | * metadata requests for operations like open, unlink, and so forth. | |
29 | * If there is a MDS failure, we find out about it when we (possibly | |
30 | * request and) receive a new MDS map, and can resubmit affected | |
31 | * requests. | |
32 | * | |
33 | * For the most part, though, we take advantage of a lossless | |
34 | * communications channel to the MDS, and do not need to worry about | |
35 | * timing out or resubmitting requests. | |
36 | * | |
37 | * We maintain a stateful "session" with each MDS we interact with. | |
38 | * Within each session, we sent periodic heartbeat messages to ensure | |
39 | * any capabilities or leases we have been issues remain valid. If | |
40 | * the session times out and goes stale, our leases and capabilities | |
41 | * are no longer valid. | |
42 | */ | |
43 | ||
20cb34ae SW |
44 | struct ceph_reconnect_state { |
45 | struct ceph_pagelist *pagelist; | |
46 | bool flock; | |
47 | }; | |
48 | ||
2f2dc053 SW |
49 | static void __wake_requests(struct ceph_mds_client *mdsc, |
50 | struct list_head *head); | |
51 | ||
9e32789f | 52 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
53 | |
54 | ||
55 | /* | |
56 | * mds reply parsing | |
57 | */ | |
58 | ||
59 | /* | |
60 | * parse individual inode info | |
61 | */ | |
62 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 SW |
63 | struct ceph_mds_reply_info_in *info, |
64 | int features) | |
2f2dc053 SW |
65 | { |
66 | int err = -EIO; | |
67 | ||
68 | info->in = *p; | |
69 | *p += sizeof(struct ceph_mds_reply_inode) + | |
70 | sizeof(*info->in->fragtree.splits) * | |
71 | le32_to_cpu(info->in->fragtree.nsplits); | |
72 | ||
73 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
74 | ceph_decode_need(p, end, info->symlink_len, bad); | |
75 | info->symlink = *p; | |
76 | *p += info->symlink_len; | |
77 | ||
14303d20 SW |
78 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
79 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
80 | sizeof(info->dir_layout), bad); | |
81 | else | |
82 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
83 | ||
2f2dc053 SW |
84 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
85 | ceph_decode_need(p, end, info->xattr_len, bad); | |
86 | info->xattr_data = *p; | |
87 | *p += info->xattr_len; | |
88 | return 0; | |
89 | bad: | |
90 | return err; | |
91 | } | |
92 | ||
93 | /* | |
94 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
95 | * target inode. | |
96 | */ | |
97 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 SW |
98 | struct ceph_mds_reply_info_parsed *info, |
99 | int features) | |
2f2dc053 SW |
100 | { |
101 | int err; | |
102 | ||
103 | if (info->head->is_dentry) { | |
14303d20 | 104 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
105 | if (err < 0) |
106 | goto out_bad; | |
107 | ||
108 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
109 | goto bad; | |
110 | info->dirfrag = *p; | |
111 | *p += sizeof(*info->dirfrag) + | |
112 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
113 | if (unlikely(*p > end)) | |
114 | goto bad; | |
115 | ||
116 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
117 | ceph_decode_need(p, end, info->dname_len, bad); | |
118 | info->dname = *p; | |
119 | *p += info->dname_len; | |
120 | info->dlease = *p; | |
121 | *p += sizeof(*info->dlease); | |
122 | } | |
123 | ||
124 | if (info->head->is_target) { | |
14303d20 | 125 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
126 | if (err < 0) |
127 | goto out_bad; | |
128 | } | |
129 | ||
130 | if (unlikely(*p != end)) | |
131 | goto bad; | |
132 | return 0; | |
133 | ||
134 | bad: | |
135 | err = -EIO; | |
136 | out_bad: | |
137 | pr_err("problem parsing mds trace %d\n", err); | |
138 | return err; | |
139 | } | |
140 | ||
141 | /* | |
142 | * parse readdir results | |
143 | */ | |
144 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 SW |
145 | struct ceph_mds_reply_info_parsed *info, |
146 | int features) | |
2f2dc053 SW |
147 | { |
148 | u32 num, i = 0; | |
149 | int err; | |
150 | ||
151 | info->dir_dir = *p; | |
152 | if (*p + sizeof(*info->dir_dir) > end) | |
153 | goto bad; | |
154 | *p += sizeof(*info->dir_dir) + | |
155 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
156 | if (*p > end) | |
157 | goto bad; | |
158 | ||
159 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
160 | num = ceph_decode_32(p); |
161 | info->dir_end = ceph_decode_8(p); | |
162 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
163 | if (num == 0) |
164 | goto done; | |
165 | ||
166 | /* alloc large array */ | |
167 | info->dir_nr = num; | |
168 | info->dir_in = kcalloc(num, sizeof(*info->dir_in) + | |
169 | sizeof(*info->dir_dname) + | |
170 | sizeof(*info->dir_dname_len) + | |
171 | sizeof(*info->dir_dlease), | |
172 | GFP_NOFS); | |
173 | if (info->dir_in == NULL) { | |
174 | err = -ENOMEM; | |
175 | goto out_bad; | |
176 | } | |
177 | info->dir_dname = (void *)(info->dir_in + num); | |
178 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
179 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
180 | ||
181 | while (num) { | |
182 | /* dentry */ | |
183 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 184 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
185 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
186 | info->dir_dname[i] = *p; | |
187 | *p += info->dir_dname_len[i]; | |
188 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
189 | info->dir_dname[i]); | |
190 | info->dir_dlease[i] = *p; | |
191 | *p += sizeof(struct ceph_mds_reply_lease); | |
192 | ||
193 | /* inode */ | |
14303d20 | 194 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
2f2dc053 SW |
195 | if (err < 0) |
196 | goto out_bad; | |
197 | i++; | |
198 | num--; | |
199 | } | |
200 | ||
201 | done: | |
202 | if (*p != end) | |
203 | goto bad; | |
204 | return 0; | |
205 | ||
206 | bad: | |
207 | err = -EIO; | |
208 | out_bad: | |
209 | pr_err("problem parsing dir contents %d\n", err); | |
210 | return err; | |
211 | } | |
212 | ||
25933abd HS |
213 | /* |
214 | * parse fcntl F_GETLK results | |
215 | */ | |
216 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 SW |
217 | struct ceph_mds_reply_info_parsed *info, |
218 | int features) | |
25933abd HS |
219 | { |
220 | if (*p + sizeof(*info->filelock_reply) > end) | |
221 | goto bad; | |
222 | ||
223 | info->filelock_reply = *p; | |
224 | *p += sizeof(*info->filelock_reply); | |
225 | ||
226 | if (unlikely(*p != end)) | |
227 | goto bad; | |
228 | return 0; | |
229 | ||
230 | bad: | |
231 | return -EIO; | |
232 | } | |
233 | ||
234 | /* | |
235 | * parse extra results | |
236 | */ | |
237 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 SW |
238 | struct ceph_mds_reply_info_parsed *info, |
239 | int features) | |
25933abd HS |
240 | { |
241 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 242 | return parse_reply_info_filelock(p, end, info, features); |
25933abd | 243 | else |
14303d20 | 244 | return parse_reply_info_dir(p, end, info, features); |
25933abd HS |
245 | } |
246 | ||
2f2dc053 SW |
247 | /* |
248 | * parse entire mds reply | |
249 | */ | |
250 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 SW |
251 | struct ceph_mds_reply_info_parsed *info, |
252 | int features) | |
2f2dc053 SW |
253 | { |
254 | void *p, *end; | |
255 | u32 len; | |
256 | int err; | |
257 | ||
258 | info->head = msg->front.iov_base; | |
259 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
260 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
261 | ||
262 | /* trace */ | |
263 | ceph_decode_32_safe(&p, end, len, bad); | |
264 | if (len > 0) { | |
14303d20 | 265 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
266 | if (err < 0) |
267 | goto out_bad; | |
268 | } | |
269 | ||
25933abd | 270 | /* extra */ |
2f2dc053 SW |
271 | ceph_decode_32_safe(&p, end, len, bad); |
272 | if (len > 0) { | |
14303d20 | 273 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
274 | if (err < 0) |
275 | goto out_bad; | |
276 | } | |
277 | ||
278 | /* snap blob */ | |
279 | ceph_decode_32_safe(&p, end, len, bad); | |
280 | info->snapblob_len = len; | |
281 | info->snapblob = p; | |
282 | p += len; | |
283 | ||
284 | if (p != end) | |
285 | goto bad; | |
286 | return 0; | |
287 | ||
288 | bad: | |
289 | err = -EIO; | |
290 | out_bad: | |
291 | pr_err("mds parse_reply err %d\n", err); | |
292 | return err; | |
293 | } | |
294 | ||
295 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
296 | { | |
297 | kfree(info->dir_in); | |
298 | } | |
299 | ||
300 | ||
301 | /* | |
302 | * sessions | |
303 | */ | |
304 | static const char *session_state_name(int s) | |
305 | { | |
306 | switch (s) { | |
307 | case CEPH_MDS_SESSION_NEW: return "new"; | |
308 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
309 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
310 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
311 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 312 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
313 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
314 | default: return "???"; | |
315 | } | |
316 | } | |
317 | ||
318 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
319 | { | |
320 | if (atomic_inc_not_zero(&s->s_ref)) { | |
321 | dout("mdsc get_session %p %d -> %d\n", s, | |
322 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
323 | return s; | |
324 | } else { | |
325 | dout("mdsc get_session %p 0 -- FAIL", s); | |
326 | return NULL; | |
327 | } | |
328 | } | |
329 | ||
330 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
331 | { | |
332 | dout("mdsc put_session %p %d -> %d\n", s, | |
333 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd SW |
334 | if (atomic_dec_and_test(&s->s_ref)) { |
335 | if (s->s_authorizer) | |
3d14c5d2 YS |
336 | s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer( |
337 | s->s_mdsc->fsc->client->monc.auth, | |
338 | s->s_authorizer); | |
2f2dc053 | 339 | kfree(s); |
4e7a5dcd | 340 | } |
2f2dc053 SW |
341 | } |
342 | ||
343 | /* | |
344 | * called under mdsc->mutex | |
345 | */ | |
346 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
347 | int mds) | |
348 | { | |
349 | struct ceph_mds_session *session; | |
350 | ||
351 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
352 | return NULL; | |
353 | session = mdsc->sessions[mds]; | |
354 | dout("lookup_mds_session %p %d\n", session, | |
355 | atomic_read(&session->s_ref)); | |
356 | get_session(session); | |
357 | return session; | |
358 | } | |
359 | ||
360 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
361 | { | |
362 | if (mds >= mdsc->max_sessions) | |
363 | return false; | |
364 | return mdsc->sessions[mds]; | |
365 | } | |
366 | ||
2600d2dd SW |
367 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
368 | struct ceph_mds_session *s) | |
369 | { | |
370 | if (s->s_mds >= mdsc->max_sessions || | |
371 | mdsc->sessions[s->s_mds] != s) | |
372 | return -ENOENT; | |
373 | return 0; | |
374 | } | |
375 | ||
2f2dc053 SW |
376 | /* |
377 | * create+register a new session for given mds. | |
378 | * called under mdsc->mutex. | |
379 | */ | |
380 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
381 | int mds) | |
382 | { | |
383 | struct ceph_mds_session *s; | |
384 | ||
385 | s = kzalloc(sizeof(*s), GFP_NOFS); | |
4736b009 DC |
386 | if (!s) |
387 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
388 | s->s_mdsc = mdsc; |
389 | s->s_mds = mds; | |
390 | s->s_state = CEPH_MDS_SESSION_NEW; | |
391 | s->s_ttl = 0; | |
392 | s->s_seq = 0; | |
393 | mutex_init(&s->s_mutex); | |
394 | ||
3d14c5d2 | 395 | ceph_con_init(mdsc->fsc->client->msgr, &s->s_con); |
2f2dc053 SW |
396 | s->s_con.private = s; |
397 | s->s_con.ops = &mds_con_ops; | |
398 | s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS; | |
399 | s->s_con.peer_name.num = cpu_to_le64(mds); | |
2f2dc053 SW |
400 | |
401 | spin_lock_init(&s->s_cap_lock); | |
402 | s->s_cap_gen = 0; | |
403 | s->s_cap_ttl = 0; | |
404 | s->s_renew_requested = 0; | |
405 | s->s_renew_seq = 0; | |
406 | INIT_LIST_HEAD(&s->s_caps); | |
407 | s->s_nr_caps = 0; | |
5dacf091 | 408 | s->s_trim_caps = 0; |
2f2dc053 SW |
409 | atomic_set(&s->s_ref, 1); |
410 | INIT_LIST_HEAD(&s->s_waiting); | |
411 | INIT_LIST_HEAD(&s->s_unsafe); | |
412 | s->s_num_cap_releases = 0; | |
7c1332b8 | 413 | s->s_cap_iterator = NULL; |
2f2dc053 SW |
414 | INIT_LIST_HEAD(&s->s_cap_releases); |
415 | INIT_LIST_HEAD(&s->s_cap_releases_done); | |
416 | INIT_LIST_HEAD(&s->s_cap_flushing); | |
417 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); | |
418 | ||
419 | dout("register_session mds%d\n", mds); | |
420 | if (mds >= mdsc->max_sessions) { | |
421 | int newmax = 1 << get_count_order(mds+1); | |
422 | struct ceph_mds_session **sa; | |
423 | ||
424 | dout("register_session realloc to %d\n", newmax); | |
425 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
426 | if (sa == NULL) | |
42ce56e5 | 427 | goto fail_realloc; |
2f2dc053 SW |
428 | if (mdsc->sessions) { |
429 | memcpy(sa, mdsc->sessions, | |
430 | mdsc->max_sessions * sizeof(void *)); | |
431 | kfree(mdsc->sessions); | |
432 | } | |
433 | mdsc->sessions = sa; | |
434 | mdsc->max_sessions = newmax; | |
435 | } | |
436 | mdsc->sessions[mds] = s; | |
437 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ | |
42ce56e5 SW |
438 | |
439 | ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
440 | ||
2f2dc053 | 441 | return s; |
42ce56e5 SW |
442 | |
443 | fail_realloc: | |
444 | kfree(s); | |
445 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
446 | } |
447 | ||
448 | /* | |
449 | * called under mdsc->mutex | |
450 | */ | |
2600d2dd | 451 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 452 | struct ceph_mds_session *s) |
2f2dc053 | 453 | { |
2600d2dd SW |
454 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
455 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
456 | mdsc->sessions[s->s_mds] = NULL; |
457 | ceph_con_close(&s->s_con); | |
458 | ceph_put_mds_session(s); | |
2f2dc053 SW |
459 | } |
460 | ||
461 | /* | |
462 | * drop session refs in request. | |
463 | * | |
464 | * should be last request ref, or hold mdsc->mutex | |
465 | */ | |
466 | static void put_request_session(struct ceph_mds_request *req) | |
467 | { | |
468 | if (req->r_session) { | |
469 | ceph_put_mds_session(req->r_session); | |
470 | req->r_session = NULL; | |
471 | } | |
472 | } | |
473 | ||
153c8e6b | 474 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 475 | { |
153c8e6b SW |
476 | struct ceph_mds_request *req = container_of(kref, |
477 | struct ceph_mds_request, | |
478 | r_kref); | |
479 | if (req->r_request) | |
480 | ceph_msg_put(req->r_request); | |
481 | if (req->r_reply) { | |
482 | ceph_msg_put(req->r_reply); | |
483 | destroy_reply_info(&req->r_reply_info); | |
484 | } | |
485 | if (req->r_inode) { | |
486 | ceph_put_cap_refs(ceph_inode(req->r_inode), | |
487 | CEPH_CAP_PIN); | |
488 | iput(req->r_inode); | |
489 | } | |
490 | if (req->r_locked_dir) | |
491 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), | |
492 | CEPH_CAP_PIN); | |
493 | if (req->r_target_inode) | |
494 | iput(req->r_target_inode); | |
495 | if (req->r_dentry) | |
496 | dput(req->r_dentry); | |
497 | if (req->r_old_dentry) { | |
498 | ceph_put_cap_refs( | |
499 | ceph_inode(req->r_old_dentry->d_parent->d_inode), | |
500 | CEPH_CAP_PIN); | |
501 | dput(req->r_old_dentry); | |
2f2dc053 | 502 | } |
153c8e6b SW |
503 | kfree(req->r_path1); |
504 | kfree(req->r_path2); | |
505 | put_request_session(req); | |
37151668 | 506 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 507 | kfree(req); |
2f2dc053 SW |
508 | } |
509 | ||
510 | /* | |
511 | * lookup session, bump ref if found. | |
512 | * | |
513 | * called under mdsc->mutex. | |
514 | */ | |
515 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, | |
516 | u64 tid) | |
517 | { | |
518 | struct ceph_mds_request *req; | |
44ca18f2 SW |
519 | struct rb_node *n = mdsc->request_tree.rb_node; |
520 | ||
521 | while (n) { | |
522 | req = rb_entry(n, struct ceph_mds_request, r_node); | |
523 | if (tid < req->r_tid) | |
524 | n = n->rb_left; | |
525 | else if (tid > req->r_tid) | |
526 | n = n->rb_right; | |
527 | else { | |
528 | ceph_mdsc_get_request(req); | |
529 | return req; | |
530 | } | |
531 | } | |
532 | return NULL; | |
533 | } | |
534 | ||
535 | static void __insert_request(struct ceph_mds_client *mdsc, | |
536 | struct ceph_mds_request *new) | |
537 | { | |
538 | struct rb_node **p = &mdsc->request_tree.rb_node; | |
539 | struct rb_node *parent = NULL; | |
540 | struct ceph_mds_request *req = NULL; | |
541 | ||
542 | while (*p) { | |
543 | parent = *p; | |
544 | req = rb_entry(parent, struct ceph_mds_request, r_node); | |
545 | if (new->r_tid < req->r_tid) | |
546 | p = &(*p)->rb_left; | |
547 | else if (new->r_tid > req->r_tid) | |
548 | p = &(*p)->rb_right; | |
549 | else | |
550 | BUG(); | |
551 | } | |
552 | ||
553 | rb_link_node(&new->r_node, parent, p); | |
554 | rb_insert_color(&new->r_node, &mdsc->request_tree); | |
2f2dc053 SW |
555 | } |
556 | ||
557 | /* | |
558 | * Register an in-flight request, and assign a tid. Link to directory | |
559 | * are modifying (if any). | |
560 | * | |
561 | * Called under mdsc->mutex. | |
562 | */ | |
563 | static void __register_request(struct ceph_mds_client *mdsc, | |
564 | struct ceph_mds_request *req, | |
565 | struct inode *dir) | |
566 | { | |
567 | req->r_tid = ++mdsc->last_tid; | |
568 | if (req->r_num_caps) | |
37151668 YS |
569 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
570 | req->r_num_caps); | |
2f2dc053 SW |
571 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
572 | ceph_mdsc_get_request(req); | |
44ca18f2 | 573 | __insert_request(mdsc, req); |
2f2dc053 | 574 | |
cb4276cc SW |
575 | req->r_uid = current_fsuid(); |
576 | req->r_gid = current_fsgid(); | |
577 | ||
2f2dc053 SW |
578 | if (dir) { |
579 | struct ceph_inode_info *ci = ceph_inode(dir); | |
580 | ||
3b663780 | 581 | ihold(dir); |
2f2dc053 SW |
582 | spin_lock(&ci->i_unsafe_lock); |
583 | req->r_unsafe_dir = dir; | |
584 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
585 | spin_unlock(&ci->i_unsafe_lock); | |
586 | } | |
587 | } | |
588 | ||
589 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
590 | struct ceph_mds_request *req) | |
591 | { | |
592 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
44ca18f2 | 593 | rb_erase(&req->r_node, &mdsc->request_tree); |
80fc7314 | 594 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
595 | |
596 | if (req->r_unsafe_dir) { | |
597 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); | |
598 | ||
599 | spin_lock(&ci->i_unsafe_lock); | |
600 | list_del_init(&req->r_unsafe_dir_item); | |
601 | spin_unlock(&ci->i_unsafe_lock); | |
3b663780 SW |
602 | |
603 | iput(req->r_unsafe_dir); | |
604 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 605 | } |
94aa8ae1 SW |
606 | |
607 | ceph_mdsc_put_request(req); | |
2f2dc053 SW |
608 | } |
609 | ||
610 | /* | |
611 | * Choose mds to send request to next. If there is a hint set in the | |
612 | * request (e.g., due to a prior forward hint from the mds), use that. | |
613 | * Otherwise, consult frag tree and/or caps to identify the | |
614 | * appropriate mds. If all else fails, choose randomly. | |
615 | * | |
616 | * Called under mdsc->mutex. | |
617 | */ | |
eb6bb1c5 SW |
618 | struct dentry *get_nonsnap_parent(struct dentry *dentry) |
619 | { | |
620 | while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) | |
621 | dentry = dentry->d_parent; | |
622 | return dentry; | |
623 | } | |
624 | ||
2f2dc053 SW |
625 | static int __choose_mds(struct ceph_mds_client *mdsc, |
626 | struct ceph_mds_request *req) | |
627 | { | |
628 | struct inode *inode; | |
629 | struct ceph_inode_info *ci; | |
630 | struct ceph_cap *cap; | |
631 | int mode = req->r_direct_mode; | |
632 | int mds = -1; | |
633 | u32 hash = req->r_direct_hash; | |
634 | bool is_hash = req->r_direct_is_hash; | |
635 | ||
636 | /* | |
637 | * is there a specific mds we should try? ignore hint if we have | |
638 | * no session and the mds is not up (active or recovering). | |
639 | */ | |
640 | if (req->r_resend_mds >= 0 && | |
641 | (__have_session(mdsc, req->r_resend_mds) || | |
642 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
643 | dout("choose_mds using resend_mds mds%d\n", | |
644 | req->r_resend_mds); | |
645 | return req->r_resend_mds; | |
646 | } | |
647 | ||
648 | if (mode == USE_RANDOM_MDS) | |
649 | goto random; | |
650 | ||
651 | inode = NULL; | |
652 | if (req->r_inode) { | |
653 | inode = req->r_inode; | |
654 | } else if (req->r_dentry) { | |
eb6bb1c5 SW |
655 | struct inode *dir = req->r_dentry->d_parent->d_inode; |
656 | ||
3d14c5d2 | 657 | if (dir->i_sb != mdsc->fsc->sb) { |
eb6bb1c5 SW |
658 | /* not this fs! */ |
659 | inode = req->r_dentry->d_inode; | |
660 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { | |
661 | /* direct snapped/virtual snapdir requests | |
662 | * based on parent dir inode */ | |
663 | struct dentry *dn = | |
664 | get_nonsnap_parent(req->r_dentry->d_parent); | |
665 | inode = dn->d_inode; | |
666 | dout("__choose_mds using nonsnap parent %p\n", inode); | |
667 | } else if (req->r_dentry->d_inode) { | |
668 | /* dentry target */ | |
2f2dc053 SW |
669 | inode = req->r_dentry->d_inode; |
670 | } else { | |
eb6bb1c5 SW |
671 | /* dir + name */ |
672 | inode = dir; | |
e5f86dc3 | 673 | hash = ceph_dentry_hash(dir, req->r_dentry); |
2f2dc053 SW |
674 | is_hash = true; |
675 | } | |
676 | } | |
eb6bb1c5 | 677 | |
2f2dc053 SW |
678 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
679 | (int)hash, mode); | |
680 | if (!inode) | |
681 | goto random; | |
682 | ci = ceph_inode(inode); | |
683 | ||
684 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
685 | struct ceph_inode_frag frag; | |
686 | int found; | |
687 | ||
688 | ceph_choose_frag(ci, hash, &frag, &found); | |
689 | if (found) { | |
690 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
691 | u8 r; | |
692 | ||
693 | /* choose a random replica */ | |
694 | get_random_bytes(&r, 1); | |
695 | r %= frag.ndist; | |
696 | mds = frag.dist[r]; | |
697 | dout("choose_mds %p %llx.%llx " | |
698 | "frag %u mds%d (%d/%d)\n", | |
699 | inode, ceph_vinop(inode), | |
d66bbd44 | 700 | frag.frag, mds, |
2f2dc053 | 701 | (int)r, frag.ndist); |
d66bbd44 SW |
702 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
703 | CEPH_MDS_STATE_ACTIVE) | |
704 | return mds; | |
2f2dc053 SW |
705 | } |
706 | ||
707 | /* since this file/dir wasn't known to be | |
708 | * replicated, then we want to look for the | |
709 | * authoritative mds. */ | |
710 | mode = USE_AUTH_MDS; | |
711 | if (frag.mds >= 0) { | |
712 | /* choose auth mds */ | |
713 | mds = frag.mds; | |
714 | dout("choose_mds %p %llx.%llx " | |
715 | "frag %u mds%d (auth)\n", | |
716 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
717 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
718 | CEPH_MDS_STATE_ACTIVE) | |
719 | return mds; | |
2f2dc053 SW |
720 | } |
721 | } | |
722 | } | |
723 | ||
724 | spin_lock(&inode->i_lock); | |
725 | cap = NULL; | |
726 | if (mode == USE_AUTH_MDS) | |
727 | cap = ci->i_auth_cap; | |
728 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
729 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
730 | if (!cap) { | |
731 | spin_unlock(&inode->i_lock); | |
732 | goto random; | |
733 | } | |
734 | mds = cap->session->s_mds; | |
735 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
736 | inode, ceph_vinop(inode), mds, | |
737 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
738 | spin_unlock(&inode->i_lock); | |
739 | return mds; | |
740 | ||
741 | random: | |
742 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
743 | dout("choose_mds chose random mds%d\n", mds); | |
744 | return mds; | |
745 | } | |
746 | ||
747 | ||
748 | /* | |
749 | * session messages | |
750 | */ | |
751 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
752 | { | |
753 | struct ceph_msg *msg; | |
754 | struct ceph_mds_session_head *h; | |
755 | ||
34d23762 | 756 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS); |
a79832f2 | 757 | if (!msg) { |
2f2dc053 | 758 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 759 | return NULL; |
2f2dc053 SW |
760 | } |
761 | h = msg->front.iov_base; | |
762 | h->op = cpu_to_le32(op); | |
763 | h->seq = cpu_to_le64(seq); | |
764 | return msg; | |
765 | } | |
766 | ||
767 | /* | |
768 | * send session open request. | |
769 | * | |
770 | * called under mdsc->mutex | |
771 | */ | |
772 | static int __open_session(struct ceph_mds_client *mdsc, | |
773 | struct ceph_mds_session *session) | |
774 | { | |
775 | struct ceph_msg *msg; | |
776 | int mstate; | |
777 | int mds = session->s_mds; | |
2f2dc053 SW |
778 | |
779 | /* wait for mds to go active? */ | |
780 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
781 | dout("open_session to mds%d (%s)\n", mds, | |
782 | ceph_mds_state_name(mstate)); | |
783 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
784 | session->s_renew_requested = jiffies; | |
785 | ||
786 | /* send connect message */ | |
787 | msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq); | |
a79832f2 SW |
788 | if (!msg) |
789 | return -ENOMEM; | |
2f2dc053 | 790 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
791 | return 0; |
792 | } | |
793 | ||
ed0552a1 SW |
794 | /* |
795 | * open sessions for any export targets for the given mds | |
796 | * | |
797 | * called under mdsc->mutex | |
798 | */ | |
799 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, | |
800 | struct ceph_mds_session *session) | |
801 | { | |
802 | struct ceph_mds_info *mi; | |
803 | struct ceph_mds_session *ts; | |
804 | int i, mds = session->s_mds; | |
805 | int target; | |
806 | ||
807 | if (mds >= mdsc->mdsmap->m_max_mds) | |
808 | return; | |
809 | mi = &mdsc->mdsmap->m_info[mds]; | |
810 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
811 | session->s_mds, mi->num_export_targets); | |
812 | ||
813 | for (i = 0; i < mi->num_export_targets; i++) { | |
814 | target = mi->export_targets[i]; | |
815 | ts = __ceph_lookup_mds_session(mdsc, target); | |
816 | if (!ts) { | |
817 | ts = register_session(mdsc, target); | |
818 | if (IS_ERR(ts)) | |
819 | return; | |
820 | } | |
821 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
822 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
823 | __open_session(mdsc, session); | |
824 | else | |
825 | dout(" mds%d target mds%d %p is %s\n", session->s_mds, | |
826 | i, ts, session_state_name(ts->s_state)); | |
827 | ceph_put_mds_session(ts); | |
828 | } | |
829 | } | |
830 | ||
154f42c2 SW |
831 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
832 | struct ceph_mds_session *session) | |
833 | { | |
834 | mutex_lock(&mdsc->mutex); | |
835 | __open_export_target_sessions(mdsc, session); | |
836 | mutex_unlock(&mdsc->mutex); | |
837 | } | |
838 | ||
2f2dc053 SW |
839 | /* |
840 | * session caps | |
841 | */ | |
842 | ||
843 | /* | |
844 | * Free preallocated cap messages assigned to this session | |
845 | */ | |
846 | static void cleanup_cap_releases(struct ceph_mds_session *session) | |
847 | { | |
848 | struct ceph_msg *msg; | |
849 | ||
850 | spin_lock(&session->s_cap_lock); | |
851 | while (!list_empty(&session->s_cap_releases)) { | |
852 | msg = list_first_entry(&session->s_cap_releases, | |
853 | struct ceph_msg, list_head); | |
854 | list_del_init(&msg->list_head); | |
855 | ceph_msg_put(msg); | |
856 | } | |
857 | while (!list_empty(&session->s_cap_releases_done)) { | |
858 | msg = list_first_entry(&session->s_cap_releases_done, | |
859 | struct ceph_msg, list_head); | |
860 | list_del_init(&msg->list_head); | |
861 | ceph_msg_put(msg); | |
862 | } | |
863 | spin_unlock(&session->s_cap_lock); | |
864 | } | |
865 | ||
866 | /* | |
f818a736 SW |
867 | * Helper to safely iterate over all caps associated with a session, with |
868 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 869 | * |
f818a736 | 870 | * Caller must hold session s_mutex. |
2f2dc053 SW |
871 | */ |
872 | static int iterate_session_caps(struct ceph_mds_session *session, | |
873 | int (*cb)(struct inode *, struct ceph_cap *, | |
874 | void *), void *arg) | |
875 | { | |
7c1332b8 SW |
876 | struct list_head *p; |
877 | struct ceph_cap *cap; | |
878 | struct inode *inode, *last_inode = NULL; | |
879 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
880 | int ret; |
881 | ||
882 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
883 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
884 | p = session->s_caps.next; |
885 | while (p != &session->s_caps) { | |
886 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 887 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
888 | if (!inode) { |
889 | p = p->next; | |
2f2dc053 | 890 | continue; |
7c1332b8 SW |
891 | } |
892 | session->s_cap_iterator = cap; | |
2f2dc053 | 893 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
894 | |
895 | if (last_inode) { | |
896 | iput(last_inode); | |
897 | last_inode = NULL; | |
898 | } | |
899 | if (old_cap) { | |
37151668 | 900 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
901 | old_cap = NULL; |
902 | } | |
903 | ||
2f2dc053 | 904 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
905 | last_inode = inode; |
906 | ||
2f2dc053 | 907 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
908 | p = p->next; |
909 | if (cap->ci == NULL) { | |
910 | dout("iterate_session_caps finishing cap %p removal\n", | |
911 | cap); | |
912 | BUG_ON(cap->session != session); | |
913 | list_del_init(&cap->session_caps); | |
914 | session->s_nr_caps--; | |
915 | cap->session = NULL; | |
916 | old_cap = cap; /* put_cap it w/o locks held */ | |
917 | } | |
5dacf091 SW |
918 | if (ret < 0) |
919 | goto out; | |
2f2dc053 | 920 | } |
5dacf091 SW |
921 | ret = 0; |
922 | out: | |
7c1332b8 | 923 | session->s_cap_iterator = NULL; |
2f2dc053 | 924 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
925 | |
926 | if (last_inode) | |
927 | iput(last_inode); | |
928 | if (old_cap) | |
37151668 | 929 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 930 | |
5dacf091 | 931 | return ret; |
2f2dc053 SW |
932 | } |
933 | ||
934 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 935 | void *arg) |
2f2dc053 SW |
936 | { |
937 | struct ceph_inode_info *ci = ceph_inode(inode); | |
6c99f254 SW |
938 | int drop = 0; |
939 | ||
2f2dc053 SW |
940 | dout("removing cap %p, ci is %p, inode is %p\n", |
941 | cap, ci, &ci->vfs_inode); | |
6c99f254 SW |
942 | spin_lock(&inode->i_lock); |
943 | __ceph_remove_cap(cap); | |
944 | if (!__ceph_is_any_real_caps(ci)) { | |
945 | struct ceph_mds_client *mdsc = | |
3d14c5d2 | 946 | ceph_sb_to_client(inode->i_sb)->mdsc; |
6c99f254 SW |
947 | |
948 | spin_lock(&mdsc->cap_dirty_lock); | |
949 | if (!list_empty(&ci->i_dirty_item)) { | |
950 | pr_info(" dropping dirty %s state for %p %lld\n", | |
951 | ceph_cap_string(ci->i_dirty_caps), | |
952 | inode, ceph_ino(inode)); | |
953 | ci->i_dirty_caps = 0; | |
954 | list_del_init(&ci->i_dirty_item); | |
955 | drop = 1; | |
956 | } | |
957 | if (!list_empty(&ci->i_flushing_item)) { | |
958 | pr_info(" dropping dirty+flushing %s state for %p %lld\n", | |
959 | ceph_cap_string(ci->i_flushing_caps), | |
960 | inode, ceph_ino(inode)); | |
961 | ci->i_flushing_caps = 0; | |
962 | list_del_init(&ci->i_flushing_item); | |
963 | mdsc->num_cap_flushing--; | |
964 | drop = 1; | |
965 | } | |
966 | if (drop && ci->i_wrbuffer_ref) { | |
967 | pr_info(" dropping dirty data for %p %lld\n", | |
968 | inode, ceph_ino(inode)); | |
969 | ci->i_wrbuffer_ref = 0; | |
970 | ci->i_wrbuffer_ref_head = 0; | |
971 | drop++; | |
972 | } | |
973 | spin_unlock(&mdsc->cap_dirty_lock); | |
974 | } | |
975 | spin_unlock(&inode->i_lock); | |
976 | while (drop--) | |
977 | iput(inode); | |
2f2dc053 SW |
978 | return 0; |
979 | } | |
980 | ||
981 | /* | |
982 | * caller must hold session s_mutex | |
983 | */ | |
984 | static void remove_session_caps(struct ceph_mds_session *session) | |
985 | { | |
986 | dout("remove_session_caps on %p\n", session); | |
987 | iterate_session_caps(session, remove_session_caps_cb, NULL); | |
988 | BUG_ON(session->s_nr_caps > 0); | |
6c99f254 | 989 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
2f2dc053 SW |
990 | cleanup_cap_releases(session); |
991 | } | |
992 | ||
993 | /* | |
994 | * wake up any threads waiting on this session's caps. if the cap is | |
995 | * old (didn't get renewed on the client reconnect), remove it now. | |
996 | * | |
997 | * caller must hold s_mutex. | |
998 | */ | |
999 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1000 | void *arg) | |
1001 | { | |
0dc2570f SW |
1002 | struct ceph_inode_info *ci = ceph_inode(inode); |
1003 | ||
03066f23 | 1004 | wake_up_all(&ci->i_cap_wq); |
0dc2570f SW |
1005 | if (arg) { |
1006 | spin_lock(&inode->i_lock); | |
1007 | ci->i_wanted_max_size = 0; | |
1008 | ci->i_requested_max_size = 0; | |
1009 | spin_unlock(&inode->i_lock); | |
1010 | } | |
2f2dc053 SW |
1011 | return 0; |
1012 | } | |
1013 | ||
0dc2570f SW |
1014 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1015 | int reconnect) | |
2f2dc053 SW |
1016 | { |
1017 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1018 | iterate_session_caps(session, wake_up_session_cb, |
1019 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1020 | } |
1021 | ||
1022 | /* | |
1023 | * Send periodic message to MDS renewing all currently held caps. The | |
1024 | * ack will reset the expiration for all caps from this session. | |
1025 | * | |
1026 | * caller holds s_mutex | |
1027 | */ | |
1028 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1029 | struct ceph_mds_session *session) | |
1030 | { | |
1031 | struct ceph_msg *msg; | |
1032 | int state; | |
1033 | ||
1034 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1035 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1036 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1037 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1038 | |
1039 | /* do not try to renew caps until a recovering mds has reconnected | |
1040 | * with its clients. */ | |
1041 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1042 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1043 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1044 | session->s_mds, ceph_mds_state_name(state)); | |
1045 | return 0; | |
1046 | } | |
1047 | ||
1048 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1049 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1050 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1051 | ++session->s_renew_seq); | |
a79832f2 SW |
1052 | if (!msg) |
1053 | return -ENOMEM; | |
2f2dc053 SW |
1054 | ceph_con_send(&session->s_con, msg); |
1055 | return 0; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1060 | * |
1061 | * Called under session->s_mutex | |
2f2dc053 SW |
1062 | */ |
1063 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1064 | struct ceph_mds_session *session, int is_renew) | |
1065 | { | |
1066 | int was_stale; | |
1067 | int wake = 0; | |
1068 | ||
1069 | spin_lock(&session->s_cap_lock); | |
1070 | was_stale = is_renew && (session->s_cap_ttl == 0 || | |
1071 | time_after_eq(jiffies, session->s_cap_ttl)); | |
1072 | ||
1073 | session->s_cap_ttl = session->s_renew_requested + | |
1074 | mdsc->mdsmap->m_session_timeout*HZ; | |
1075 | ||
1076 | if (was_stale) { | |
1077 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1078 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1079 | wake = 1; | |
1080 | } else { | |
1081 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1082 | } | |
1083 | } | |
1084 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1085 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1086 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1087 | spin_unlock(&session->s_cap_lock); | |
1088 | ||
1089 | if (wake) | |
0dc2570f | 1090 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1091 | } |
1092 | ||
1093 | /* | |
1094 | * send a session close request | |
1095 | */ | |
1096 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1097 | struct ceph_mds_session *session) | |
1098 | { | |
1099 | struct ceph_msg *msg; | |
2f2dc053 SW |
1100 | |
1101 | dout("request_close_session mds%d state %s seq %lld\n", | |
1102 | session->s_mds, session_state_name(session->s_state), | |
1103 | session->s_seq); | |
1104 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1105 | if (!msg) |
1106 | return -ENOMEM; | |
1107 | ceph_con_send(&session->s_con, msg); | |
1108 | return 0; | |
2f2dc053 SW |
1109 | } |
1110 | ||
1111 | /* | |
1112 | * Called with s_mutex held. | |
1113 | */ | |
1114 | static int __close_session(struct ceph_mds_client *mdsc, | |
1115 | struct ceph_mds_session *session) | |
1116 | { | |
1117 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1118 | return 0; | |
1119 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1120 | return request_close_session(mdsc, session); | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Trim old(er) caps. | |
1125 | * | |
1126 | * Because we can't cache an inode without one or more caps, we do | |
1127 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1128 | * point the inode will hopefully get dropped to. | |
1129 | * | |
1130 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1131 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1132 | */ | |
1133 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1134 | { | |
1135 | struct ceph_mds_session *session = arg; | |
1136 | struct ceph_inode_info *ci = ceph_inode(inode); | |
1137 | int used, oissued, mine; | |
1138 | ||
1139 | if (session->s_trim_caps <= 0) | |
1140 | return -1; | |
1141 | ||
1142 | spin_lock(&inode->i_lock); | |
1143 | mine = cap->issued | cap->implemented; | |
1144 | used = __ceph_caps_used(ci); | |
1145 | oissued = __ceph_caps_issued_other(ci, cap); | |
1146 | ||
1147 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n", | |
1148 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), | |
1149 | ceph_cap_string(used)); | |
1150 | if (ci->i_dirty_caps) | |
1151 | goto out; /* dirty caps */ | |
1152 | if ((used & ~oissued) & mine) | |
1153 | goto out; /* we need these caps */ | |
1154 | ||
1155 | session->s_trim_caps--; | |
1156 | if (oissued) { | |
1157 | /* we aren't the only cap.. just remove us */ | |
7c1332b8 | 1158 | __ceph_remove_cap(cap); |
2f2dc053 SW |
1159 | } else { |
1160 | /* try to drop referring dentries */ | |
1161 | spin_unlock(&inode->i_lock); | |
1162 | d_prune_aliases(inode); | |
1163 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1164 | inode, cap, atomic_read(&inode->i_count)); | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | out: | |
1169 | spin_unlock(&inode->i_lock); | |
1170 | return 0; | |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * Trim session cap count down to some max number. | |
1175 | */ | |
1176 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1177 | struct ceph_mds_session *session, | |
1178 | int max_caps) | |
1179 | { | |
1180 | int trim_caps = session->s_nr_caps - max_caps; | |
1181 | ||
1182 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1183 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1184 | if (trim_caps > 0) { | |
1185 | session->s_trim_caps = trim_caps; | |
1186 | iterate_session_caps(session, trim_caps_cb, session); | |
1187 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1188 | session->s_mds, session->s_nr_caps, max_caps, | |
1189 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1190 | session->s_trim_caps = 0; |
2f2dc053 SW |
1191 | } |
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Allocate cap_release messages. If there is a partially full message | |
1197 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1198 | * we can send it immediately. | |
1199 | * | |
1200 | * Called under s_mutex. | |
1201 | */ | |
2b2300d6 | 1202 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
ee6b272b | 1203 | struct ceph_mds_session *session) |
2f2dc053 | 1204 | { |
38e8883e | 1205 | struct ceph_msg *msg, *partial = NULL; |
2f2dc053 SW |
1206 | struct ceph_mds_cap_release *head; |
1207 | int err = -ENOMEM; | |
3d14c5d2 | 1208 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
38e8883e | 1209 | int num; |
2f2dc053 | 1210 | |
38e8883e SW |
1211 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
1212 | extra); | |
2f2dc053 SW |
1213 | |
1214 | spin_lock(&session->s_cap_lock); | |
1215 | ||
1216 | if (!list_empty(&session->s_cap_releases)) { | |
1217 | msg = list_first_entry(&session->s_cap_releases, | |
1218 | struct ceph_msg, | |
1219 | list_head); | |
1220 | head = msg->front.iov_base; | |
38e8883e SW |
1221 | num = le32_to_cpu(head->num); |
1222 | if (num) { | |
1223 | dout(" partial %p with (%d/%d)\n", msg, num, | |
1224 | (int)CEPH_CAPS_PER_RELEASE); | |
1225 | extra += CEPH_CAPS_PER_RELEASE - num; | |
1226 | partial = msg; | |
1227 | } | |
2f2dc053 | 1228 | } |
2f2dc053 SW |
1229 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
1230 | spin_unlock(&session->s_cap_lock); | |
34d23762 YS |
1231 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
1232 | GFP_NOFS); | |
2f2dc053 SW |
1233 | if (!msg) |
1234 | goto out_unlocked; | |
1235 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1236 | (int)msg->front.iov_len); | |
1237 | head = msg->front.iov_base; | |
1238 | head->num = cpu_to_le32(0); | |
1239 | msg->front.iov_len = sizeof(*head); | |
1240 | spin_lock(&session->s_cap_lock); | |
1241 | list_add(&msg->list_head, &session->s_cap_releases); | |
1242 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1243 | } | |
1244 | ||
38e8883e SW |
1245 | if (partial) { |
1246 | head = partial->front.iov_base; | |
1247 | num = le32_to_cpu(head->num); | |
1248 | dout(" queueing partial %p with %d/%d\n", partial, num, | |
1249 | (int)CEPH_CAPS_PER_RELEASE); | |
1250 | list_move_tail(&partial->list_head, | |
1251 | &session->s_cap_releases_done); | |
1252 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; | |
2f2dc053 SW |
1253 | } |
1254 | err = 0; | |
1255 | spin_unlock(&session->s_cap_lock); | |
1256 | out_unlocked: | |
1257 | return err; | |
1258 | } | |
1259 | ||
1260 | /* | |
1261 | * flush all dirty inode data to disk. | |
1262 | * | |
1263 | * returns true if we've flushed through want_flush_seq | |
1264 | */ | |
1265 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1266 | { | |
1267 | int mds, ret = 1; | |
1268 | ||
1269 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1270 | mutex_lock(&mdsc->mutex); | |
1271 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1272 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1273 | ||
1274 | if (!session) | |
1275 | continue; | |
1276 | get_session(session); | |
1277 | mutex_unlock(&mdsc->mutex); | |
1278 | ||
1279 | mutex_lock(&session->s_mutex); | |
1280 | if (!list_empty(&session->s_cap_flushing)) { | |
1281 | struct ceph_inode_info *ci = | |
1282 | list_entry(session->s_cap_flushing.next, | |
1283 | struct ceph_inode_info, | |
1284 | i_flushing_item); | |
1285 | struct inode *inode = &ci->vfs_inode; | |
1286 | ||
1287 | spin_lock(&inode->i_lock); | |
1288 | if (ci->i_cap_flush_seq <= want_flush_seq) { | |
1289 | dout("check_cap_flush still flushing %p " | |
1290 | "seq %lld <= %lld to mds%d\n", inode, | |
1291 | ci->i_cap_flush_seq, want_flush_seq, | |
1292 | session->s_mds); | |
1293 | ret = 0; | |
1294 | } | |
1295 | spin_unlock(&inode->i_lock); | |
1296 | } | |
1297 | mutex_unlock(&session->s_mutex); | |
1298 | ceph_put_mds_session(session); | |
1299 | ||
1300 | if (!ret) | |
1301 | return ret; | |
1302 | mutex_lock(&mdsc->mutex); | |
1303 | } | |
1304 | ||
1305 | mutex_unlock(&mdsc->mutex); | |
1306 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1307 | return ret; | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * called under s_mutex | |
1312 | */ | |
3d7ded4d SW |
1313 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1314 | struct ceph_mds_session *session) | |
2f2dc053 SW |
1315 | { |
1316 | struct ceph_msg *msg; | |
1317 | ||
1318 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1319 | spin_lock(&session->s_cap_lock); |
1320 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1321 | msg = list_first_entry(&session->s_cap_releases_done, |
1322 | struct ceph_msg, list_head); | |
1323 | list_del_init(&msg->list_head); | |
1324 | spin_unlock(&session->s_cap_lock); | |
1325 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1326 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1327 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1328 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1329 | } |
1330 | spin_unlock(&session->s_cap_lock); | |
1331 | } | |
1332 | ||
e01a5946 SW |
1333 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1334 | struct ceph_mds_session *session) | |
1335 | { | |
1336 | struct ceph_msg *msg; | |
1337 | struct ceph_mds_cap_release *head; | |
1338 | unsigned num; | |
1339 | ||
1340 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
1341 | spin_lock(&session->s_cap_lock); | |
1342 | ||
1343 | /* zero out the in-progress message */ | |
1344 | msg = list_first_entry(&session->s_cap_releases, | |
1345 | struct ceph_msg, list_head); | |
1346 | head = msg->front.iov_base; | |
1347 | num = le32_to_cpu(head->num); | |
1348 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num); | |
1349 | head->num = cpu_to_le32(0); | |
1350 | session->s_num_cap_releases += num; | |
1351 | ||
1352 | /* requeue completed messages */ | |
1353 | while (!list_empty(&session->s_cap_releases_done)) { | |
1354 | msg = list_first_entry(&session->s_cap_releases_done, | |
1355 | struct ceph_msg, list_head); | |
1356 | list_del_init(&msg->list_head); | |
1357 | ||
1358 | head = msg->front.iov_base; | |
1359 | num = le32_to_cpu(head->num); | |
1360 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1361 | num); | |
1362 | session->s_num_cap_releases += num; | |
1363 | head->num = cpu_to_le32(0); | |
1364 | msg->front.iov_len = sizeof(*head); | |
1365 | list_add(&msg->list_head, &session->s_cap_releases); | |
1366 | } | |
1367 | ||
1368 | spin_unlock(&session->s_cap_lock); | |
1369 | } | |
1370 | ||
2f2dc053 SW |
1371 | /* |
1372 | * requests | |
1373 | */ | |
1374 | ||
1375 | /* | |
1376 | * Create an mds request. | |
1377 | */ | |
1378 | struct ceph_mds_request * | |
1379 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1380 | { | |
1381 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1382 | ||
1383 | if (!req) | |
1384 | return ERR_PTR(-ENOMEM); | |
1385 | ||
b4556396 | 1386 | mutex_init(&req->r_fill_mutex); |
37151668 | 1387 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1388 | req->r_started = jiffies; |
1389 | req->r_resend_mds = -1; | |
1390 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1391 | req->r_fmode = -1; | |
153c8e6b | 1392 | kref_init(&req->r_kref); |
2f2dc053 SW |
1393 | INIT_LIST_HEAD(&req->r_wait); |
1394 | init_completion(&req->r_completion); | |
1395 | init_completion(&req->r_safe_completion); | |
1396 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1397 | ||
1398 | req->r_op = op; | |
1399 | req->r_direct_mode = mode; | |
1400 | return req; | |
1401 | } | |
1402 | ||
1403 | /* | |
44ca18f2 | 1404 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1405 | * |
1406 | * called under mdsc->mutex. | |
1407 | */ | |
44ca18f2 SW |
1408 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1409 | { | |
1410 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1411 | return NULL; | |
1412 | return rb_entry(rb_first(&mdsc->request_tree), | |
1413 | struct ceph_mds_request, r_node); | |
1414 | } | |
1415 | ||
2f2dc053 SW |
1416 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1417 | { | |
44ca18f2 SW |
1418 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1419 | ||
1420 | if (req) | |
1421 | return req->r_tid; | |
1422 | return 0; | |
2f2dc053 SW |
1423 | } |
1424 | ||
1425 | /* | |
1426 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1427 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1428 | * | |
1429 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1430 | * inode. | |
1431 | * | |
1432 | * Encode hidden .snap dirs as a double /, i.e. | |
1433 | * foo/.snap/bar -> foo//bar | |
1434 | */ | |
1435 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1436 | int stop_on_nosnap) | |
1437 | { | |
1438 | struct dentry *temp; | |
1439 | char *path; | |
1440 | int len, pos; | |
1b71fe2e | 1441 | unsigned seq; |
2f2dc053 SW |
1442 | |
1443 | if (dentry == NULL) | |
1444 | return ERR_PTR(-EINVAL); | |
1445 | ||
1446 | retry: | |
1447 | len = 0; | |
1b71fe2e AV |
1448 | seq = read_seqbegin(&rename_lock); |
1449 | rcu_read_lock(); | |
2f2dc053 SW |
1450 | for (temp = dentry; !IS_ROOT(temp);) { |
1451 | struct inode *inode = temp->d_inode; | |
1452 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1453 | len++; /* slash only */ | |
1454 | else if (stop_on_nosnap && inode && | |
1455 | ceph_snap(inode) == CEPH_NOSNAP) | |
1456 | break; | |
1457 | else | |
1458 | len += 1 + temp->d_name.len; | |
1459 | temp = temp->d_parent; | |
1460 | if (temp == NULL) { | |
1b71fe2e | 1461 | rcu_read_unlock(); |
6c99f254 | 1462 | pr_err("build_path corrupt dentry %p\n", dentry); |
2f2dc053 SW |
1463 | return ERR_PTR(-EINVAL); |
1464 | } | |
1465 | } | |
1b71fe2e | 1466 | rcu_read_unlock(); |
2f2dc053 SW |
1467 | if (len) |
1468 | len--; /* no leading '/' */ | |
1469 | ||
1470 | path = kmalloc(len+1, GFP_NOFS); | |
1471 | if (path == NULL) | |
1472 | return ERR_PTR(-ENOMEM); | |
1473 | pos = len; | |
1474 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1475 | rcu_read_lock(); |
2f2dc053 | 1476 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1477 | struct inode *inode; |
2f2dc053 | 1478 | |
1b71fe2e AV |
1479 | spin_lock(&temp->d_lock); |
1480 | inode = temp->d_inode; | |
2f2dc053 | 1481 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1482 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1483 | pos, temp); |
1484 | } else if (stop_on_nosnap && inode && | |
1485 | ceph_snap(inode) == CEPH_NOSNAP) { | |
1486 | break; | |
1487 | } else { | |
1488 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1489 | if (pos < 0) { |
1490 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1491 | break; |
1b71fe2e | 1492 | } |
2f2dc053 SW |
1493 | strncpy(path + pos, temp->d_name.name, |
1494 | temp->d_name.len); | |
2f2dc053 | 1495 | } |
1b71fe2e | 1496 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1497 | if (pos) |
1498 | path[--pos] = '/'; | |
1499 | temp = temp->d_parent; | |
1500 | if (temp == NULL) { | |
1b71fe2e | 1501 | rcu_read_unlock(); |
104648ad | 1502 | pr_err("build_path corrupt dentry\n"); |
2f2dc053 SW |
1503 | kfree(path); |
1504 | return ERR_PTR(-EINVAL); | |
1505 | } | |
1506 | } | |
1b71fe2e AV |
1507 | rcu_read_unlock(); |
1508 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1509 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1510 | "expected, namelen is %d, pos is %d\n", len, pos); |
1511 | /* presumably this is only possible if racing with a | |
1512 | rename of one of the parent directories (we can not | |
1513 | lock the dentries above us to prevent this, but | |
1514 | retrying should be harmless) */ | |
1515 | kfree(path); | |
1516 | goto retry; | |
1517 | } | |
1518 | ||
1519 | *base = ceph_ino(temp->d_inode); | |
1520 | *plen = len; | |
104648ad | 1521 | dout("build_path on %p %d built %llx '%.*s'\n", |
b7ab39f6 | 1522 | dentry, dentry->d_count, *base, len, path); |
2f2dc053 SW |
1523 | return path; |
1524 | } | |
1525 | ||
1526 | static int build_dentry_path(struct dentry *dentry, | |
1527 | const char **ppath, int *ppathlen, u64 *pino, | |
1528 | int *pfreepath) | |
1529 | { | |
1530 | char *path; | |
1531 | ||
1532 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1533 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1534 | *ppath = dentry->d_name.name; | |
1535 | *ppathlen = dentry->d_name.len; | |
1536 | return 0; | |
1537 | } | |
1538 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1539 | if (IS_ERR(path)) | |
1540 | return PTR_ERR(path); | |
1541 | *ppath = path; | |
1542 | *pfreepath = 1; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static int build_inode_path(struct inode *inode, | |
1547 | const char **ppath, int *ppathlen, u64 *pino, | |
1548 | int *pfreepath) | |
1549 | { | |
1550 | struct dentry *dentry; | |
1551 | char *path; | |
1552 | ||
1553 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1554 | *pino = ceph_ino(inode); | |
1555 | *ppathlen = 0; | |
1556 | return 0; | |
1557 | } | |
1558 | dentry = d_find_alias(inode); | |
1559 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1560 | dput(dentry); | |
1561 | if (IS_ERR(path)) | |
1562 | return PTR_ERR(path); | |
1563 | *ppath = path; | |
1564 | *pfreepath = 1; | |
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | /* | |
1569 | * request arguments may be specified via an inode *, a dentry *, or | |
1570 | * an explicit ino+path. | |
1571 | */ | |
1572 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1573 | const char *rpath, u64 rino, | |
1574 | const char **ppath, int *pathlen, | |
1575 | u64 *ino, int *freepath) | |
1576 | { | |
1577 | int r = 0; | |
1578 | ||
1579 | if (rinode) { | |
1580 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1581 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1582 | ceph_snap(rinode)); | |
1583 | } else if (rdentry) { | |
1584 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1585 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1586 | *ppath); | |
1587 | } else if (rpath) { | |
1588 | *ino = rino; | |
1589 | *ppath = rpath; | |
1590 | *pathlen = strlen(rpath); | |
1591 | dout(" path %.*s\n", *pathlen, rpath); | |
1592 | } | |
1593 | ||
1594 | return r; | |
1595 | } | |
1596 | ||
1597 | /* | |
1598 | * called under mdsc->mutex | |
1599 | */ | |
1600 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1601 | struct ceph_mds_request *req, | |
1602 | int mds) | |
1603 | { | |
1604 | struct ceph_msg *msg; | |
1605 | struct ceph_mds_request_head *head; | |
1606 | const char *path1 = NULL; | |
1607 | const char *path2 = NULL; | |
1608 | u64 ino1 = 0, ino2 = 0; | |
1609 | int pathlen1 = 0, pathlen2 = 0; | |
1610 | int freepath1 = 0, freepath2 = 0; | |
1611 | int len; | |
1612 | u16 releases; | |
1613 | void *p, *end; | |
1614 | int ret; | |
1615 | ||
1616 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1617 | req->r_path1, req->r_ino1.ino, | |
1618 | &path1, &pathlen1, &ino1, &freepath1); | |
1619 | if (ret < 0) { | |
1620 | msg = ERR_PTR(ret); | |
1621 | goto out; | |
1622 | } | |
1623 | ||
1624 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1625 | req->r_path2, req->r_ino2.ino, | |
1626 | &path2, &pathlen2, &ino2, &freepath2); | |
1627 | if (ret < 0) { | |
1628 | msg = ERR_PTR(ret); | |
1629 | goto out_free1; | |
1630 | } | |
1631 | ||
1632 | len = sizeof(*head) + | |
ac8839d7 | 1633 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)); |
2f2dc053 SW |
1634 | |
1635 | /* calculate (max) length for cap releases */ | |
1636 | len += sizeof(struct ceph_mds_request_release) * | |
1637 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1638 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1639 | if (req->r_dentry_drop) | |
1640 | len += req->r_dentry->d_name.len; | |
1641 | if (req->r_old_dentry_drop) | |
1642 | len += req->r_old_dentry->d_name.len; | |
1643 | ||
34d23762 | 1644 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS); |
a79832f2 SW |
1645 | if (!msg) { |
1646 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1647 | goto out_free2; |
a79832f2 | 1648 | } |
2f2dc053 | 1649 | |
6df058c0 SW |
1650 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1651 | ||
2f2dc053 SW |
1652 | head = msg->front.iov_base; |
1653 | p = msg->front.iov_base + sizeof(*head); | |
1654 | end = msg->front.iov_base + msg->front.iov_len; | |
1655 | ||
1656 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1657 | head->op = cpu_to_le32(req->r_op); | |
cb4276cc SW |
1658 | head->caller_uid = cpu_to_le32(req->r_uid); |
1659 | head->caller_gid = cpu_to_le32(req->r_gid); | |
2f2dc053 SW |
1660 | head->args = req->r_args; |
1661 | ||
1662 | ceph_encode_filepath(&p, end, ino1, path1); | |
1663 | ceph_encode_filepath(&p, end, ino2, path2); | |
1664 | ||
e979cf50 SW |
1665 | /* make note of release offset, in case we need to replay */ |
1666 | req->r_request_release_offset = p - msg->front.iov_base; | |
1667 | ||
2f2dc053 SW |
1668 | /* cap releases */ |
1669 | releases = 0; | |
1670 | if (req->r_inode_drop) | |
1671 | releases += ceph_encode_inode_release(&p, | |
1672 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1673 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1674 | if (req->r_dentry_drop) | |
1675 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1676 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1677 | if (req->r_old_dentry_drop) | |
1678 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1679 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1680 | if (req->r_old_inode_drop) | |
1681 | releases += ceph_encode_inode_release(&p, | |
1682 | req->r_old_dentry->d_inode, | |
1683 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1684 | head->num_releases = cpu_to_le16(releases); | |
1685 | ||
1686 | BUG_ON(p > end); | |
1687 | msg->front.iov_len = p - msg->front.iov_base; | |
1688 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1689 | ||
1690 | msg->pages = req->r_pages; | |
1691 | msg->nr_pages = req->r_num_pages; | |
1692 | msg->hdr.data_len = cpu_to_le32(req->r_data_len); | |
1693 | msg->hdr.data_off = cpu_to_le16(0); | |
1694 | ||
1695 | out_free2: | |
1696 | if (freepath2) | |
1697 | kfree((char *)path2); | |
1698 | out_free1: | |
1699 | if (freepath1) | |
1700 | kfree((char *)path1); | |
1701 | out: | |
1702 | return msg; | |
1703 | } | |
1704 | ||
1705 | /* | |
1706 | * called under mdsc->mutex if error, under no mutex if | |
1707 | * success. | |
1708 | */ | |
1709 | static void complete_request(struct ceph_mds_client *mdsc, | |
1710 | struct ceph_mds_request *req) | |
1711 | { | |
1712 | if (req->r_callback) | |
1713 | req->r_callback(mdsc, req); | |
1714 | else | |
03066f23 | 1715 | complete_all(&req->r_completion); |
2f2dc053 SW |
1716 | } |
1717 | ||
1718 | /* | |
1719 | * called under mdsc->mutex | |
1720 | */ | |
1721 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1722 | struct ceph_mds_request *req, | |
1723 | int mds) | |
1724 | { | |
1725 | struct ceph_mds_request_head *rhead; | |
1726 | struct ceph_msg *msg; | |
1727 | int flags = 0; | |
1728 | ||
2f2dc053 | 1729 | req->r_attempts++; |
e55b71f8 GF |
1730 | if (req->r_inode) { |
1731 | struct ceph_cap *cap = | |
1732 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
1733 | ||
1734 | if (cap) | |
1735 | req->r_sent_on_mseq = cap->mseq; | |
1736 | else | |
1737 | req->r_sent_on_mseq = -1; | |
1738 | } | |
2f2dc053 SW |
1739 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
1740 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1741 | ||
01a92f17 SW |
1742 | if (req->r_got_unsafe) { |
1743 | /* | |
1744 | * Replay. Do not regenerate message (and rebuild | |
1745 | * paths, etc.); just use the original message. | |
1746 | * Rebuilding paths will break for renames because | |
1747 | * d_move mangles the src name. | |
1748 | */ | |
1749 | msg = req->r_request; | |
1750 | rhead = msg->front.iov_base; | |
1751 | ||
1752 | flags = le32_to_cpu(rhead->flags); | |
1753 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1754 | rhead->flags = cpu_to_le32(flags); | |
1755 | ||
1756 | if (req->r_target_inode) | |
1757 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
1758 | ||
1759 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
1760 | |
1761 | /* remove cap/dentry releases from message */ | |
1762 | rhead->num_releases = 0; | |
1763 | msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset); | |
1764 | msg->front.iov_len = req->r_request_release_offset; | |
01a92f17 SW |
1765 | return 0; |
1766 | } | |
1767 | ||
2f2dc053 SW |
1768 | if (req->r_request) { |
1769 | ceph_msg_put(req->r_request); | |
1770 | req->r_request = NULL; | |
1771 | } | |
1772 | msg = create_request_message(mdsc, req, mds); | |
1773 | if (IS_ERR(msg)) { | |
e1518c7c | 1774 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 1775 | complete_request(mdsc, req); |
a79832f2 | 1776 | return PTR_ERR(msg); |
2f2dc053 SW |
1777 | } |
1778 | req->r_request = msg; | |
1779 | ||
1780 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
1781 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
1782 | if (req->r_got_unsafe) | |
1783 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1784 | if (req->r_locked_dir) | |
1785 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
1786 | rhead->flags = cpu_to_le32(flags); | |
1787 | rhead->num_fwd = req->r_num_fwd; | |
1788 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 1789 | rhead->ino = 0; |
2f2dc053 SW |
1790 | |
1791 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
1792 | return 0; |
1793 | } | |
1794 | ||
1795 | /* | |
1796 | * send request, or put it on the appropriate wait list. | |
1797 | */ | |
1798 | static int __do_request(struct ceph_mds_client *mdsc, | |
1799 | struct ceph_mds_request *req) | |
1800 | { | |
1801 | struct ceph_mds_session *session = NULL; | |
1802 | int mds = -1; | |
1803 | int err = -EAGAIN; | |
1804 | ||
e1518c7c | 1805 | if (req->r_err || req->r_got_result) |
2f2dc053 SW |
1806 | goto out; |
1807 | ||
1808 | if (req->r_timeout && | |
1809 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
1810 | dout("do_request timed out\n"); | |
1811 | err = -EIO; | |
1812 | goto finish; | |
1813 | } | |
1814 | ||
dc69e2e9 SW |
1815 | put_request_session(req); |
1816 | ||
2f2dc053 SW |
1817 | mds = __choose_mds(mdsc, req); |
1818 | if (mds < 0 || | |
1819 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
1820 | dout("do_request no mds or not active, waiting for map\n"); | |
1821 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
1822 | goto out; | |
1823 | } | |
1824 | ||
1825 | /* get, open session */ | |
1826 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 1827 | if (!session) { |
2f2dc053 | 1828 | session = register_session(mdsc, mds); |
9c423956 SW |
1829 | if (IS_ERR(session)) { |
1830 | err = PTR_ERR(session); | |
1831 | goto finish; | |
1832 | } | |
1833 | } | |
dc69e2e9 SW |
1834 | req->r_session = get_session(session); |
1835 | ||
2f2dc053 SW |
1836 | dout("do_request mds%d session %p state %s\n", mds, session, |
1837 | session_state_name(session->s_state)); | |
1838 | if (session->s_state != CEPH_MDS_SESSION_OPEN && | |
1839 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
1840 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
1841 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
1842 | __open_session(mdsc, session); | |
1843 | list_add(&req->r_wait, &session->s_waiting); | |
1844 | goto out_session; | |
1845 | } | |
1846 | ||
1847 | /* send request */ | |
2f2dc053 SW |
1848 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
1849 | ||
1850 | if (req->r_request_started == 0) /* note request start time */ | |
1851 | req->r_request_started = jiffies; | |
1852 | ||
1853 | err = __prepare_send_request(mdsc, req, mds); | |
1854 | if (!err) { | |
1855 | ceph_msg_get(req->r_request); | |
1856 | ceph_con_send(&session->s_con, req->r_request); | |
1857 | } | |
1858 | ||
1859 | out_session: | |
1860 | ceph_put_mds_session(session); | |
1861 | out: | |
1862 | return err; | |
1863 | ||
1864 | finish: | |
e1518c7c | 1865 | req->r_err = err; |
2f2dc053 SW |
1866 | complete_request(mdsc, req); |
1867 | goto out; | |
1868 | } | |
1869 | ||
1870 | /* | |
1871 | * called under mdsc->mutex | |
1872 | */ | |
1873 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
1874 | struct list_head *head) | |
1875 | { | |
1876 | struct ceph_mds_request *req, *nreq; | |
1877 | ||
1878 | list_for_each_entry_safe(req, nreq, head, r_wait) { | |
1879 | list_del_init(&req->r_wait); | |
1880 | __do_request(mdsc, req); | |
1881 | } | |
1882 | } | |
1883 | ||
1884 | /* | |
1885 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 1886 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 1887 | */ |
29790f26 | 1888 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 1889 | { |
44ca18f2 SW |
1890 | struct ceph_mds_request *req; |
1891 | struct rb_node *p; | |
2f2dc053 SW |
1892 | |
1893 | dout("kick_requests mds%d\n", mds); | |
44ca18f2 SW |
1894 | for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
1895 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
1896 | if (req->r_got_unsafe) | |
1897 | continue; | |
1898 | if (req->r_session && | |
1899 | req->r_session->s_mds == mds) { | |
1900 | dout(" kicking tid %llu\n", req->r_tid); | |
44ca18f2 | 1901 | __do_request(mdsc, req); |
2f2dc053 SW |
1902 | } |
1903 | } | |
1904 | } | |
1905 | ||
1906 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
1907 | struct ceph_mds_request *req) | |
1908 | { | |
1909 | dout("submit_request on %p\n", req); | |
1910 | mutex_lock(&mdsc->mutex); | |
1911 | __register_request(mdsc, req, NULL); | |
1912 | __do_request(mdsc, req); | |
1913 | mutex_unlock(&mdsc->mutex); | |
1914 | } | |
1915 | ||
1916 | /* | |
1917 | * Synchrously perform an mds request. Take care of all of the | |
1918 | * session setup, forwarding, retry details. | |
1919 | */ | |
1920 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
1921 | struct inode *dir, | |
1922 | struct ceph_mds_request *req) | |
1923 | { | |
1924 | int err; | |
1925 | ||
1926 | dout("do_request on %p\n", req); | |
1927 | ||
1928 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
1929 | if (req->r_inode) | |
1930 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
1931 | if (req->r_locked_dir) | |
1932 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
1933 | if (req->r_old_dentry) | |
1934 | ceph_get_cap_refs( | |
1935 | ceph_inode(req->r_old_dentry->d_parent->d_inode), | |
1936 | CEPH_CAP_PIN); | |
1937 | ||
1938 | /* issue */ | |
1939 | mutex_lock(&mdsc->mutex); | |
1940 | __register_request(mdsc, req, dir); | |
1941 | __do_request(mdsc, req); | |
1942 | ||
e1518c7c SW |
1943 | if (req->r_err) { |
1944 | err = req->r_err; | |
1945 | __unregister_request(mdsc, req); | |
1946 | dout("do_request early error %d\n", err); | |
1947 | goto out; | |
2f2dc053 SW |
1948 | } |
1949 | ||
e1518c7c SW |
1950 | /* wait */ |
1951 | mutex_unlock(&mdsc->mutex); | |
1952 | dout("do_request waiting\n"); | |
1953 | if (req->r_timeout) { | |
aa91647c | 1954 | err = (long)wait_for_completion_killable_timeout( |
e1518c7c SW |
1955 | &req->r_completion, req->r_timeout); |
1956 | if (err == 0) | |
1957 | err = -EIO; | |
1958 | } else { | |
aa91647c | 1959 | err = wait_for_completion_killable(&req->r_completion); |
e1518c7c SW |
1960 | } |
1961 | dout("do_request waited, got %d\n", err); | |
1962 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 1963 | |
e1518c7c SW |
1964 | /* only abort if we didn't race with a real reply */ |
1965 | if (req->r_got_result) { | |
1966 | err = le32_to_cpu(req->r_reply_info.head->result); | |
1967 | } else if (err < 0) { | |
1968 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
1969 | |
1970 | /* | |
1971 | * ensure we aren't running concurrently with | |
1972 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
1973 | * rely on locks (dir mutex) held by our caller. | |
1974 | */ | |
1975 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
1976 | req->r_err = err; |
1977 | req->r_aborted = true; | |
b4556396 | 1978 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 1979 | |
e1518c7c | 1980 | if (req->r_locked_dir && |
167c9e35 SW |
1981 | (req->r_op & CEPH_MDS_OP_WRITE)) |
1982 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 1983 | } else { |
e1518c7c | 1984 | err = req->r_err; |
2f2dc053 | 1985 | } |
2f2dc053 | 1986 | |
e1518c7c SW |
1987 | out: |
1988 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
1989 | dout("do_request %p done, result %d\n", req, err); |
1990 | return err; | |
1991 | } | |
1992 | ||
167c9e35 SW |
1993 | /* |
1994 | * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS | |
1995 | * namespace request. | |
1996 | */ | |
1997 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
1998 | { | |
1999 | struct inode *inode = req->r_locked_dir; | |
2000 | struct ceph_inode_info *ci = ceph_inode(inode); | |
2001 | ||
2002 | dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode); | |
2003 | spin_lock(&inode->i_lock); | |
2004 | ci->i_ceph_flags &= ~CEPH_I_COMPLETE; | |
2005 | ci->i_release_count++; | |
2006 | spin_unlock(&inode->i_lock); | |
2007 | ||
2008 | if (req->r_dentry) | |
2009 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2010 | if (req->r_old_dentry) | |
2011 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2012 | } | |
2013 | ||
2f2dc053 SW |
2014 | /* |
2015 | * Handle mds reply. | |
2016 | * | |
2017 | * We take the session mutex and parse and process the reply immediately. | |
2018 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2019 | * by the MDS as they are applied to our local cache. | |
2020 | */ | |
2021 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2022 | { | |
2023 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2024 | struct ceph_mds_request *req; | |
2025 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2026 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
2027 | u64 tid; | |
2028 | int err, result; | |
2600d2dd | 2029 | int mds = session->s_mds; |
2f2dc053 | 2030 | |
2f2dc053 SW |
2031 | if (msg->front.iov_len < sizeof(*head)) { |
2032 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2033 | ceph_msg_dump(msg); |
2f2dc053 SW |
2034 | return; |
2035 | } | |
2036 | ||
2037 | /* get request, session */ | |
6df058c0 | 2038 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2039 | mutex_lock(&mdsc->mutex); |
2040 | req = __lookup_request(mdsc, tid); | |
2041 | if (!req) { | |
2042 | dout("handle_reply on unknown tid %llu\n", tid); | |
2043 | mutex_unlock(&mdsc->mutex); | |
2044 | return; | |
2045 | } | |
2046 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2047 | |
2048 | /* correct session? */ | |
d96d6049 | 2049 | if (req->r_session != session) { |
2f2dc053 SW |
2050 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2051 | " not mds%d\n", tid, session->s_mds, | |
2052 | req->r_session ? req->r_session->s_mds : -1); | |
2053 | mutex_unlock(&mdsc->mutex); | |
2054 | goto out; | |
2055 | } | |
2056 | ||
2057 | /* dup? */ | |
2058 | if ((req->r_got_unsafe && !head->safe) || | |
2059 | (req->r_got_safe && head->safe)) { | |
2060 | pr_warning("got a dup %s reply on %llu from mds%d\n", | |
2061 | head->safe ? "safe" : "unsafe", tid, mds); | |
2062 | mutex_unlock(&mdsc->mutex); | |
2063 | goto out; | |
2064 | } | |
85792d0d SW |
2065 | if (req->r_got_safe && !head->safe) { |
2066 | pr_warning("got unsafe after safe on %llu from mds%d\n", | |
2067 | tid, mds); | |
2068 | mutex_unlock(&mdsc->mutex); | |
2069 | goto out; | |
2070 | } | |
2f2dc053 SW |
2071 | |
2072 | result = le32_to_cpu(head->result); | |
2073 | ||
2074 | /* | |
e55b71f8 GF |
2075 | * Handle an ESTALE |
2076 | * if we're not talking to the authority, send to them | |
2077 | * if the authority has changed while we weren't looking, | |
2078 | * send to new authority | |
2079 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2080 | */ |
2081 | if (result == -ESTALE) { | |
e55b71f8 | 2082 | dout("got ESTALE on request %llu", req->r_tid); |
213c99ee SW |
2083 | if (!req->r_inode) { |
2084 | /* do nothing; not an authority problem */ | |
2085 | } else if (req->r_direct_mode != USE_AUTH_MDS) { | |
e55b71f8 GF |
2086 | dout("not using auth, setting for that now"); |
2087 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2088 | __do_request(mdsc, req); |
2089 | mutex_unlock(&mdsc->mutex); | |
2090 | goto out; | |
e55b71f8 GF |
2091 | } else { |
2092 | struct ceph_inode_info *ci = ceph_inode(req->r_inode); | |
4af25fdd SW |
2093 | struct ceph_cap *cap = NULL; |
2094 | ||
2095 | if (req->r_session) | |
2096 | cap = ceph_get_cap_for_mds(ci, | |
2097 | req->r_session->s_mds); | |
e55b71f8 GF |
2098 | |
2099 | dout("already using auth"); | |
2100 | if ((!cap || cap != ci->i_auth_cap) || | |
2101 | (cap->mseq != req->r_sent_on_mseq)) { | |
2102 | dout("but cap changed, so resending"); | |
2103 | __do_request(mdsc, req); | |
2104 | mutex_unlock(&mdsc->mutex); | |
2105 | goto out; | |
2106 | } | |
2f2dc053 | 2107 | } |
e55b71f8 | 2108 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2109 | } |
2110 | ||
e55b71f8 | 2111 | |
2f2dc053 SW |
2112 | if (head->safe) { |
2113 | req->r_got_safe = true; | |
2114 | __unregister_request(mdsc, req); | |
03066f23 | 2115 | complete_all(&req->r_safe_completion); |
2f2dc053 SW |
2116 | |
2117 | if (req->r_got_unsafe) { | |
2118 | /* | |
2119 | * We already handled the unsafe response, now do the | |
2120 | * cleanup. No need to examine the response; the MDS | |
2121 | * doesn't include any result info in the safe | |
2122 | * response. And even if it did, there is nothing | |
2123 | * useful we could do with a revised return value. | |
2124 | */ | |
2125 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2126 | list_del_init(&req->r_unsafe_item); | |
2127 | ||
2128 | /* last unsafe request during umount? */ | |
44ca18f2 | 2129 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2130 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2131 | mutex_unlock(&mdsc->mutex); |
2132 | goto out; | |
2133 | } | |
e1518c7c | 2134 | } else { |
2f2dc053 SW |
2135 | req->r_got_unsafe = true; |
2136 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
2137 | } | |
2138 | ||
2139 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2140 | rinfo = &req->r_reply_info; | |
14303d20 | 2141 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2142 | mutex_unlock(&mdsc->mutex); |
2143 | ||
2144 | mutex_lock(&session->s_mutex); | |
2145 | if (err < 0) { | |
25933abd | 2146 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2147 | ceph_msg_dump(msg); |
2f2dc053 SW |
2148 | goto out_err; |
2149 | } | |
2150 | ||
2151 | /* snap trace */ | |
2152 | if (rinfo->snapblob_len) { | |
2153 | down_write(&mdsc->snap_rwsem); | |
2154 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
2155 | rinfo->snapblob + rinfo->snapblob_len, | |
2156 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
2157 | downgrade_write(&mdsc->snap_rwsem); | |
2158 | } else { | |
2159 | down_read(&mdsc->snap_rwsem); | |
2160 | } | |
2161 | ||
2162 | /* insert trace into our cache */ | |
b4556396 | 2163 | mutex_lock(&req->r_fill_mutex); |
3d14c5d2 | 2164 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2165 | if (err == 0) { |
25933abd HS |
2166 | if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK && |
2167 | rinfo->dir_nr) | |
2f2dc053 | 2168 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2169 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2170 | } |
b4556396 | 2171 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2172 | |
2173 | up_read(&mdsc->snap_rwsem); | |
2174 | out_err: | |
e1518c7c SW |
2175 | mutex_lock(&mdsc->mutex); |
2176 | if (!req->r_aborted) { | |
2177 | if (err) { | |
2178 | req->r_err = err; | |
2179 | } else { | |
2180 | req->r_reply = msg; | |
2181 | ceph_msg_get(msg); | |
2182 | req->r_got_result = true; | |
2183 | } | |
2f2dc053 | 2184 | } else { |
e1518c7c | 2185 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2186 | } |
e1518c7c | 2187 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2188 | |
ee6b272b | 2189 | ceph_add_cap_releases(mdsc, req->r_session); |
2f2dc053 SW |
2190 | mutex_unlock(&session->s_mutex); |
2191 | ||
2192 | /* kick calling process */ | |
2193 | complete_request(mdsc, req); | |
2194 | out: | |
2195 | ceph_mdsc_put_request(req); | |
2196 | return; | |
2197 | } | |
2198 | ||
2199 | ||
2200 | ||
2201 | /* | |
2202 | * handle mds notification that our request has been forwarded. | |
2203 | */ | |
2600d2dd SW |
2204 | static void handle_forward(struct ceph_mds_client *mdsc, |
2205 | struct ceph_mds_session *session, | |
2206 | struct ceph_msg *msg) | |
2f2dc053 SW |
2207 | { |
2208 | struct ceph_mds_request *req; | |
a1ea787c | 2209 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2210 | u32 next_mds; |
2211 | u32 fwd_seq; | |
2f2dc053 SW |
2212 | int err = -EINVAL; |
2213 | void *p = msg->front.iov_base; | |
2214 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2215 | |
a1ea787c | 2216 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2217 | next_mds = ceph_decode_32(&p); |
2218 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2219 | |
2220 | mutex_lock(&mdsc->mutex); | |
2221 | req = __lookup_request(mdsc, tid); | |
2222 | if (!req) { | |
2a8e5e36 | 2223 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2224 | goto out; /* dup reply? */ |
2225 | } | |
2226 | ||
2a8e5e36 SW |
2227 | if (req->r_aborted) { |
2228 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2229 | __unregister_request(mdsc, req); | |
2230 | } else if (fwd_seq <= req->r_num_fwd) { | |
2231 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2232 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2233 | } else { | |
2234 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2235 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2236 | BUG_ON(req->r_err); | |
2237 | BUG_ON(req->r_got_result); | |
2f2dc053 SW |
2238 | req->r_num_fwd = fwd_seq; |
2239 | req->r_resend_mds = next_mds; | |
2240 | put_request_session(req); | |
2241 | __do_request(mdsc, req); | |
2242 | } | |
2243 | ceph_mdsc_put_request(req); | |
2244 | out: | |
2245 | mutex_unlock(&mdsc->mutex); | |
2246 | return; | |
2247 | ||
2248 | bad: | |
2249 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2250 | } | |
2251 | ||
2252 | /* | |
2253 | * handle a mds session control message | |
2254 | */ | |
2255 | static void handle_session(struct ceph_mds_session *session, | |
2256 | struct ceph_msg *msg) | |
2257 | { | |
2258 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2259 | u32 op; | |
2260 | u64 seq; | |
2600d2dd | 2261 | int mds = session->s_mds; |
2f2dc053 SW |
2262 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2263 | int wake = 0; | |
2264 | ||
2f2dc053 SW |
2265 | /* decode */ |
2266 | if (msg->front.iov_len != sizeof(*h)) | |
2267 | goto bad; | |
2268 | op = le32_to_cpu(h->op); | |
2269 | seq = le64_to_cpu(h->seq); | |
2270 | ||
2271 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2272 | if (op == CEPH_SESSION_CLOSE) |
2273 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2274 | /* FIXME: this ttl calculation is generous */ |
2275 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2276 | mutex_unlock(&mdsc->mutex); | |
2277 | ||
2278 | mutex_lock(&session->s_mutex); | |
2279 | ||
2280 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2281 | mds, ceph_session_op_name(op), session, | |
2282 | session_state_name(session->s_state), seq); | |
2283 | ||
2284 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2285 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2286 | pr_info("mds%d came back\n", session->s_mds); | |
2287 | } | |
2288 | ||
2289 | switch (op) { | |
2290 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2291 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2292 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2293 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2294 | renewed_caps(mdsc, session, 0); | |
2295 | wake = 1; | |
2296 | if (mdsc->stopping) | |
2297 | __close_session(mdsc, session); | |
2298 | break; | |
2299 | ||
2300 | case CEPH_SESSION_RENEWCAPS: | |
2301 | if (session->s_renew_seq == seq) | |
2302 | renewed_caps(mdsc, session, 1); | |
2303 | break; | |
2304 | ||
2305 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2306 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2307 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 SW |
2308 | remove_session_caps(session); |
2309 | wake = 1; /* for good measure */ | |
f3c60c59 | 2310 | wake_up_all(&mdsc->session_close_wq); |
29790f26 | 2311 | kick_requests(mdsc, mds); |
2f2dc053 SW |
2312 | break; |
2313 | ||
2314 | case CEPH_SESSION_STALE: | |
2315 | pr_info("mds%d caps went stale, renewing\n", | |
2316 | session->s_mds); | |
2317 | spin_lock(&session->s_cap_lock); | |
2318 | session->s_cap_gen++; | |
2319 | session->s_cap_ttl = 0; | |
2320 | spin_unlock(&session->s_cap_lock); | |
2321 | send_renew_caps(mdsc, session); | |
2322 | break; | |
2323 | ||
2324 | case CEPH_SESSION_RECALL_STATE: | |
2325 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2326 | break; | |
2327 | ||
2328 | default: | |
2329 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2330 | WARN_ON(1); | |
2331 | } | |
2332 | ||
2333 | mutex_unlock(&session->s_mutex); | |
2334 | if (wake) { | |
2335 | mutex_lock(&mdsc->mutex); | |
2336 | __wake_requests(mdsc, &session->s_waiting); | |
2337 | mutex_unlock(&mdsc->mutex); | |
2338 | } | |
2339 | return; | |
2340 | ||
2341 | bad: | |
2342 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2343 | (int)msg->front.iov_len); | |
9ec7cab1 | 2344 | ceph_msg_dump(msg); |
2f2dc053 SW |
2345 | return; |
2346 | } | |
2347 | ||
2348 | ||
2349 | /* | |
2350 | * called under session->mutex. | |
2351 | */ | |
2352 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2353 | struct ceph_mds_session *session) | |
2354 | { | |
2355 | struct ceph_mds_request *req, *nreq; | |
2356 | int err; | |
2357 | ||
2358 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2359 | ||
2360 | mutex_lock(&mdsc->mutex); | |
2361 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2362 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2363 | if (!err) { | |
2364 | ceph_msg_get(req->r_request); | |
2365 | ceph_con_send(&session->s_con, req->r_request); | |
2366 | } | |
2367 | } | |
2368 | mutex_unlock(&mdsc->mutex); | |
2369 | } | |
2370 | ||
2371 | /* | |
2372 | * Encode information about a cap for a reconnect with the MDS. | |
2373 | */ | |
2f2dc053 SW |
2374 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2375 | void *arg) | |
2376 | { | |
20cb34ae SW |
2377 | union { |
2378 | struct ceph_mds_cap_reconnect v2; | |
2379 | struct ceph_mds_cap_reconnect_v1 v1; | |
2380 | } rec; | |
2381 | size_t reclen; | |
2f2dc053 | 2382 | struct ceph_inode_info *ci; |
20cb34ae SW |
2383 | struct ceph_reconnect_state *recon_state = arg; |
2384 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2385 | char *path; |
2386 | int pathlen, err; | |
2387 | u64 pathbase; | |
2388 | struct dentry *dentry; | |
2389 | ||
2390 | ci = cap->ci; | |
2391 | ||
2392 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2393 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2394 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2395 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2396 | if (err) | |
2397 | return err; | |
2f2dc053 SW |
2398 | |
2399 | dentry = d_find_alias(inode); | |
2400 | if (dentry) { | |
2401 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2402 | if (IS_ERR(path)) { | |
2403 | err = PTR_ERR(path); | |
e072f8aa | 2404 | goto out_dput; |
2f2dc053 SW |
2405 | } |
2406 | } else { | |
2407 | path = NULL; | |
2408 | pathlen = 0; | |
2409 | } | |
93cea5be SW |
2410 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2411 | if (err) | |
e072f8aa | 2412 | goto out_free; |
2f2dc053 | 2413 | |
2f2dc053 SW |
2414 | spin_lock(&inode->i_lock); |
2415 | cap->seq = 0; /* reset cap seq */ | |
2416 | cap->issue_seq = 0; /* and issue_seq */ | |
20cb34ae SW |
2417 | |
2418 | if (recon_state->flock) { | |
2419 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); | |
2420 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2421 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2422 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2423 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2424 | rec.v2.flock_len = 0; | |
2425 | reclen = sizeof(rec.v2); | |
2426 | } else { | |
2427 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2428 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2429 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2430 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2431 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2432 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2433 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2434 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
2435 | reclen = sizeof(rec.v1); | |
2436 | } | |
2f2dc053 SW |
2437 | spin_unlock(&inode->i_lock); |
2438 | ||
40819f6f GF |
2439 | if (recon_state->flock) { |
2440 | int num_fcntl_locks, num_flock_locks; | |
fca4451a GF |
2441 | struct ceph_pagelist_cursor trunc_point; |
2442 | ||
2443 | ceph_pagelist_set_cursor(pagelist, &trunc_point); | |
2444 | do { | |
496e5955 | 2445 | lock_flocks(); |
fca4451a GF |
2446 | ceph_count_locks(inode, &num_fcntl_locks, |
2447 | &num_flock_locks); | |
2448 | rec.v2.flock_len = (2*sizeof(u32) + | |
2449 | (num_fcntl_locks+num_flock_locks) * | |
2450 | sizeof(struct ceph_filelock)); | |
496e5955 | 2451 | unlock_flocks(); |
fca4451a GF |
2452 | |
2453 | /* pre-alloc pagelist */ | |
2454 | ceph_pagelist_truncate(pagelist, &trunc_point); | |
2455 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
2456 | if (!err) | |
2457 | err = ceph_pagelist_reserve(pagelist, | |
2458 | rec.v2.flock_len); | |
2459 | ||
2460 | /* encode locks */ | |
2461 | if (!err) { | |
496e5955 | 2462 | lock_flocks(); |
fca4451a GF |
2463 | err = ceph_encode_locks(inode, |
2464 | pagelist, | |
2465 | num_fcntl_locks, | |
2466 | num_flock_locks); | |
496e5955 | 2467 | unlock_flocks(); |
fca4451a GF |
2468 | } |
2469 | } while (err == -ENOSPC); | |
3612abbd SW |
2470 | } else { |
2471 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
40819f6f | 2472 | } |
93cea5be | 2473 | |
e072f8aa | 2474 | out_free: |
2f2dc053 | 2475 | kfree(path); |
e072f8aa | 2476 | out_dput: |
2f2dc053 | 2477 | dput(dentry); |
93cea5be | 2478 | return err; |
2f2dc053 SW |
2479 | } |
2480 | ||
2481 | ||
2482 | /* | |
2483 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2484 | * reestablish shared state. This includes all caps issued through | |
2485 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2486 | * clear which snap realms the mds cares about, we send everything we | |
2487 | * know about.. that ensures we'll then get any new info the | |
2488 | * recovering MDS might have. | |
2489 | * | |
2490 | * This is a relatively heavyweight operation, but it's rare. | |
2491 | * | |
2492 | * called with mdsc->mutex held. | |
2493 | */ | |
34b6c855 SW |
2494 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2495 | struct ceph_mds_session *session) | |
2f2dc053 | 2496 | { |
2f2dc053 | 2497 | struct ceph_msg *reply; |
a105f00c | 2498 | struct rb_node *p; |
34b6c855 | 2499 | int mds = session->s_mds; |
9abf82b8 | 2500 | int err = -ENOMEM; |
93cea5be | 2501 | struct ceph_pagelist *pagelist; |
20cb34ae | 2502 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2503 | |
34b6c855 | 2504 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2505 | |
93cea5be SW |
2506 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2507 | if (!pagelist) | |
2508 | goto fail_nopagelist; | |
2509 | ceph_pagelist_init(pagelist); | |
2510 | ||
34d23762 | 2511 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS); |
a79832f2 | 2512 | if (!reply) |
93cea5be | 2513 | goto fail_nomsg; |
93cea5be | 2514 | |
34b6c855 SW |
2515 | mutex_lock(&session->s_mutex); |
2516 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2517 | session->s_seq = 0; | |
2f2dc053 | 2518 | |
34b6c855 SW |
2519 | ceph_con_open(&session->s_con, |
2520 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
2f2dc053 | 2521 | |
34b6c855 SW |
2522 | /* replay unsafe requests */ |
2523 | replay_unsafe_requests(mdsc, session); | |
2f2dc053 SW |
2524 | |
2525 | down_read(&mdsc->snap_rwsem); | |
2526 | ||
2f2dc053 SW |
2527 | dout("session %p state %s\n", session, |
2528 | session_state_name(session->s_state)); | |
2529 | ||
e01a5946 SW |
2530 | /* drop old cap expires; we're about to reestablish that state */ |
2531 | discard_cap_releases(mdsc, session); | |
2532 | ||
2f2dc053 | 2533 | /* traverse this session's caps */ |
93cea5be SW |
2534 | err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps); |
2535 | if (err) | |
2536 | goto fail; | |
20cb34ae SW |
2537 | |
2538 | recon_state.pagelist = pagelist; | |
2539 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; | |
2540 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); | |
2f2dc053 | 2541 | if (err < 0) |
9abf82b8 | 2542 | goto fail; |
2f2dc053 SW |
2543 | |
2544 | /* | |
2545 | * snaprealms. we provide mds with the ino, seq (version), and | |
2546 | * parent for all of our realms. If the mds has any newer info, | |
2547 | * it will tell us. | |
2548 | */ | |
a105f00c SW |
2549 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2550 | struct ceph_snap_realm *realm = | |
2551 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2552 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2553 | |
2554 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2555 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2556 | sr_rec.ino = cpu_to_le64(realm->ino); |
2557 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2558 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2559 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2560 | if (err) | |
2561 | goto fail; | |
2f2dc053 | 2562 | } |
2f2dc053 | 2563 | |
93cea5be | 2564 | reply->pagelist = pagelist; |
20cb34ae SW |
2565 | if (recon_state.flock) |
2566 | reply->hdr.version = cpu_to_le16(2); | |
93cea5be SW |
2567 | reply->hdr.data_len = cpu_to_le32(pagelist->length); |
2568 | reply->nr_pages = calc_pages_for(0, pagelist->length); | |
2f2dc053 SW |
2569 | ceph_con_send(&session->s_con, reply); |
2570 | ||
9abf82b8 SW |
2571 | mutex_unlock(&session->s_mutex); |
2572 | ||
2573 | mutex_lock(&mdsc->mutex); | |
2574 | __wake_requests(mdsc, &session->s_waiting); | |
2575 | mutex_unlock(&mdsc->mutex); | |
2576 | ||
2f2dc053 | 2577 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2578 | return; |
2579 | ||
93cea5be | 2580 | fail: |
2f2dc053 | 2581 | ceph_msg_put(reply); |
9abf82b8 SW |
2582 | up_read(&mdsc->snap_rwsem); |
2583 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
2584 | fail_nomsg: |
2585 | ceph_pagelist_release(pagelist); | |
2586 | kfree(pagelist); | |
2587 | fail_nopagelist: | |
9abf82b8 | 2588 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 2589 | return; |
2f2dc053 SW |
2590 | } |
2591 | ||
2592 | ||
2593 | /* | |
2594 | * compare old and new mdsmaps, kicking requests | |
2595 | * and closing out old connections as necessary | |
2596 | * | |
2597 | * called under mdsc->mutex. | |
2598 | */ | |
2599 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2600 | struct ceph_mdsmap *newmap, | |
2601 | struct ceph_mdsmap *oldmap) | |
2602 | { | |
2603 | int i; | |
2604 | int oldstate, newstate; | |
2605 | struct ceph_mds_session *s; | |
2606 | ||
2607 | dout("check_new_map new %u old %u\n", | |
2608 | newmap->m_epoch, oldmap->m_epoch); | |
2609 | ||
2610 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2611 | if (mdsc->sessions[i] == NULL) | |
2612 | continue; | |
2613 | s = mdsc->sessions[i]; | |
2614 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2615 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2616 | ||
0deb01c9 | 2617 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 2618 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 2619 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 2620 | ceph_mds_state_name(newstate), |
0deb01c9 | 2621 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
2f2dc053 SW |
2622 | session_state_name(s->s_state)); |
2623 | ||
2624 | if (memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2625 | ceph_mdsmap_get_addr(newmap, i), | |
2626 | sizeof(struct ceph_entity_addr))) { | |
2627 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2628 | /* the session never opened, just close it | |
2629 | * out now */ | |
2630 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2631 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2632 | } else { |
2633 | /* just close it */ | |
2634 | mutex_unlock(&mdsc->mutex); | |
2635 | mutex_lock(&s->s_mutex); | |
2636 | mutex_lock(&mdsc->mutex); | |
2637 | ceph_con_close(&s->s_con); | |
2638 | mutex_unlock(&s->s_mutex); | |
2639 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2640 | } | |
2641 | ||
2642 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2643 | kick_requests(mdsc, i); |
2f2dc053 SW |
2644 | } else if (oldstate == newstate) { |
2645 | continue; /* nothing new with this mds */ | |
2646 | } | |
2647 | ||
2648 | /* | |
2649 | * send reconnect? | |
2650 | */ | |
2651 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
2652 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
2653 | mutex_unlock(&mdsc->mutex); | |
2654 | send_mds_reconnect(mdsc, s); | |
2655 | mutex_lock(&mdsc->mutex); | |
2656 | } | |
2f2dc053 SW |
2657 | |
2658 | /* | |
29790f26 | 2659 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2660 | */ |
2661 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2662 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2663 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2664 | oldstate != CEPH_MDS_STATE_STARTING) | |
2665 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2666 | kick_requests(mdsc, i); | |
2f2dc053 | 2667 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2668 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2669 | } |
2670 | } | |
cb170a22 SW |
2671 | |
2672 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2673 | s = mdsc->sessions[i]; | |
2674 | if (!s) | |
2675 | continue; | |
2676 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
2677 | continue; | |
2678 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
2679 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
2680 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2681 | dout(" connecting to export targets of laggy mds%d\n", | |
2682 | i); | |
2683 | __open_export_target_sessions(mdsc, s); | |
2684 | } | |
2685 | } | |
2f2dc053 SW |
2686 | } |
2687 | ||
2688 | ||
2689 | ||
2690 | /* | |
2691 | * leases | |
2692 | */ | |
2693 | ||
2694 | /* | |
2695 | * caller must hold session s_mutex, dentry->d_lock | |
2696 | */ | |
2697 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2698 | { | |
2699 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2700 | ||
2701 | ceph_put_mds_session(di->lease_session); | |
2702 | di->lease_session = NULL; | |
2703 | } | |
2704 | ||
2600d2dd SW |
2705 | static void handle_lease(struct ceph_mds_client *mdsc, |
2706 | struct ceph_mds_session *session, | |
2707 | struct ceph_msg *msg) | |
2f2dc053 | 2708 | { |
3d14c5d2 | 2709 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 2710 | struct inode *inode; |
2f2dc053 SW |
2711 | struct dentry *parent, *dentry; |
2712 | struct ceph_dentry_info *di; | |
2600d2dd | 2713 | int mds = session->s_mds; |
2f2dc053 | 2714 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 2715 | u32 seq; |
2f2dc053 | 2716 | struct ceph_vino vino; |
2f2dc053 SW |
2717 | struct qstr dname; |
2718 | int release = 0; | |
2719 | ||
2f2dc053 SW |
2720 | dout("handle_lease from mds%d\n", mds); |
2721 | ||
2722 | /* decode */ | |
2723 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
2724 | goto bad; | |
2725 | vino.ino = le64_to_cpu(h->ino); | |
2726 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 2727 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
2728 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
2729 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
2730 | if (dname.len != get_unaligned_le32(h+1)) | |
2731 | goto bad; | |
2732 | ||
2f2dc053 SW |
2733 | mutex_lock(&session->s_mutex); |
2734 | session->s_seq++; | |
2735 | ||
2736 | /* lookup inode */ | |
2737 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
2738 | dout("handle_lease %s, ino %llx %p %.*s\n", |
2739 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 2740 | dname.len, dname.name); |
2f2dc053 SW |
2741 | if (inode == NULL) { |
2742 | dout("handle_lease no inode %llx\n", vino.ino); | |
2743 | goto release; | |
2744 | } | |
2f2dc053 SW |
2745 | |
2746 | /* dentry */ | |
2747 | parent = d_find_alias(inode); | |
2748 | if (!parent) { | |
2749 | dout("no parent dentry on inode %p\n", inode); | |
2750 | WARN_ON(1); | |
2751 | goto release; /* hrm... */ | |
2752 | } | |
2753 | dname.hash = full_name_hash(dname.name, dname.len); | |
2754 | dentry = d_lookup(parent, &dname); | |
2755 | dput(parent); | |
2756 | if (!dentry) | |
2757 | goto release; | |
2758 | ||
2759 | spin_lock(&dentry->d_lock); | |
2760 | di = ceph_dentry(dentry); | |
2761 | switch (h->action) { | |
2762 | case CEPH_MDS_LEASE_REVOKE: | |
2763 | if (di && di->lease_session == session) { | |
1e5ea23d SW |
2764 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
2765 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
2766 | __ceph_mdsc_drop_dentry_lease(dentry); |
2767 | } | |
2768 | release = 1; | |
2769 | break; | |
2770 | ||
2771 | case CEPH_MDS_LEASE_RENEW: | |
2772 | if (di && di->lease_session == session && | |
2773 | di->lease_gen == session->s_cap_gen && | |
2774 | di->lease_renew_from && | |
2775 | di->lease_renew_after == 0) { | |
2776 | unsigned long duration = | |
2777 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
2778 | ||
1e5ea23d | 2779 | di->lease_seq = seq; |
2f2dc053 SW |
2780 | dentry->d_time = di->lease_renew_from + duration; |
2781 | di->lease_renew_after = di->lease_renew_from + | |
2782 | (duration >> 1); | |
2783 | di->lease_renew_from = 0; | |
2784 | } | |
2785 | break; | |
2786 | } | |
2787 | spin_unlock(&dentry->d_lock); | |
2788 | dput(dentry); | |
2789 | ||
2790 | if (!release) | |
2791 | goto out; | |
2792 | ||
2793 | release: | |
2794 | /* let's just reuse the same message */ | |
2795 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
2796 | ceph_msg_get(msg); | |
2797 | ceph_con_send(&session->s_con, msg); | |
2798 | ||
2799 | out: | |
2800 | iput(inode); | |
2801 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
2802 | return; |
2803 | ||
2804 | bad: | |
2805 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 2806 | ceph_msg_dump(msg); |
2f2dc053 SW |
2807 | } |
2808 | ||
2809 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
2810 | struct inode *inode, | |
2811 | struct dentry *dentry, char action, | |
2812 | u32 seq) | |
2813 | { | |
2814 | struct ceph_msg *msg; | |
2815 | struct ceph_mds_lease *lease; | |
2816 | int len = sizeof(*lease) + sizeof(u32); | |
2817 | int dnamelen = 0; | |
2818 | ||
2819 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
2820 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
2821 | dnamelen = dentry->d_name.len; | |
2822 | len += dnamelen; | |
2823 | ||
34d23762 | 2824 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS); |
a79832f2 | 2825 | if (!msg) |
2f2dc053 SW |
2826 | return; |
2827 | lease = msg->front.iov_base; | |
2828 | lease->action = action; | |
2f2dc053 SW |
2829 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
2830 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
2831 | lease->seq = cpu_to_le32(seq); | |
2832 | put_unaligned_le32(dnamelen, lease + 1); | |
2833 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
2834 | ||
2835 | /* | |
2836 | * if this is a preemptive lease RELEASE, no need to | |
2837 | * flush request stream, since the actual request will | |
2838 | * soon follow. | |
2839 | */ | |
2840 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
2841 | ||
2842 | ceph_con_send(&session->s_con, msg); | |
2843 | } | |
2844 | ||
2845 | /* | |
2846 | * Preemptively release a lease we expect to invalidate anyway. | |
2847 | * Pass @inode always, @dentry is optional. | |
2848 | */ | |
2849 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2f90b852 | 2850 | struct dentry *dentry) |
2f2dc053 SW |
2851 | { |
2852 | struct ceph_dentry_info *di; | |
2853 | struct ceph_mds_session *session; | |
2854 | u32 seq; | |
2855 | ||
2856 | BUG_ON(inode == NULL); | |
2857 | BUG_ON(dentry == NULL); | |
2f2dc053 SW |
2858 | |
2859 | /* is dentry lease valid? */ | |
2860 | spin_lock(&dentry->d_lock); | |
2861 | di = ceph_dentry(dentry); | |
2862 | if (!di || !di->lease_session || | |
2863 | di->lease_session->s_mds < 0 || | |
2864 | di->lease_gen != di->lease_session->s_cap_gen || | |
2865 | !time_before(jiffies, dentry->d_time)) { | |
2866 | dout("lease_release inode %p dentry %p -- " | |
2f90b852 SW |
2867 | "no lease\n", |
2868 | inode, dentry); | |
2f2dc053 SW |
2869 | spin_unlock(&dentry->d_lock); |
2870 | return; | |
2871 | } | |
2872 | ||
2873 | /* we do have a lease on this dentry; note mds and seq */ | |
2874 | session = ceph_get_mds_session(di->lease_session); | |
2875 | seq = di->lease_seq; | |
2876 | __ceph_mdsc_drop_dentry_lease(dentry); | |
2877 | spin_unlock(&dentry->d_lock); | |
2878 | ||
2f90b852 SW |
2879 | dout("lease_release inode %p dentry %p to mds%d\n", |
2880 | inode, dentry, session->s_mds); | |
2f2dc053 SW |
2881 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
2882 | CEPH_MDS_LEASE_RELEASE, seq); | |
2883 | ceph_put_mds_session(session); | |
2884 | } | |
2885 | ||
2886 | /* | |
2887 | * drop all leases (and dentry refs) in preparation for umount | |
2888 | */ | |
2889 | static void drop_leases(struct ceph_mds_client *mdsc) | |
2890 | { | |
2891 | int i; | |
2892 | ||
2893 | dout("drop_leases\n"); | |
2894 | mutex_lock(&mdsc->mutex); | |
2895 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2896 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
2897 | if (!s) | |
2898 | continue; | |
2899 | mutex_unlock(&mdsc->mutex); | |
2900 | mutex_lock(&s->s_mutex); | |
2901 | mutex_unlock(&s->s_mutex); | |
2902 | ceph_put_mds_session(s); | |
2903 | mutex_lock(&mdsc->mutex); | |
2904 | } | |
2905 | mutex_unlock(&mdsc->mutex); | |
2906 | } | |
2907 | ||
2908 | ||
2909 | ||
2910 | /* | |
2911 | * delayed work -- periodically trim expired leases, renew caps with mds | |
2912 | */ | |
2913 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
2914 | { | |
2915 | int delay = 5; | |
2916 | unsigned hz = round_jiffies_relative(HZ * delay); | |
2917 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
2918 | } | |
2919 | ||
2920 | static void delayed_work(struct work_struct *work) | |
2921 | { | |
2922 | int i; | |
2923 | struct ceph_mds_client *mdsc = | |
2924 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
2925 | int renew_interval; | |
2926 | int renew_caps; | |
2927 | ||
2928 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 2929 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
2930 | |
2931 | mutex_lock(&mdsc->mutex); | |
2932 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
2933 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
2934 | mdsc->last_renew_caps); | |
2935 | if (renew_caps) | |
2936 | mdsc->last_renew_caps = jiffies; | |
2937 | ||
2938 | for (i = 0; i < mdsc->max_sessions; i++) { | |
2939 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
2940 | if (s == NULL) | |
2941 | continue; | |
2942 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2943 | dout("resending session close request for mds%d\n", | |
2944 | s->s_mds); | |
2945 | request_close_session(mdsc, s); | |
2946 | ceph_put_mds_session(s); | |
2947 | continue; | |
2948 | } | |
2949 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
2950 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
2951 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
2952 | pr_info("mds%d hung\n", s->s_mds); | |
2953 | } | |
2954 | } | |
2955 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
2956 | /* this mds is failed or recovering, just wait */ | |
2957 | ceph_put_mds_session(s); | |
2958 | continue; | |
2959 | } | |
2960 | mutex_unlock(&mdsc->mutex); | |
2961 | ||
2962 | mutex_lock(&s->s_mutex); | |
2963 | if (renew_caps) | |
2964 | send_renew_caps(mdsc, s); | |
2965 | else | |
2966 | ceph_con_keepalive(&s->s_con); | |
ee6b272b | 2967 | ceph_add_cap_releases(mdsc, s); |
aab53dd9 SW |
2968 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
2969 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 2970 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
2971 | mutex_unlock(&s->s_mutex); |
2972 | ceph_put_mds_session(s); | |
2973 | ||
2974 | mutex_lock(&mdsc->mutex); | |
2975 | } | |
2976 | mutex_unlock(&mdsc->mutex); | |
2977 | ||
2978 | schedule_delayed(mdsc); | |
2979 | } | |
2980 | ||
3d14c5d2 | 2981 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 2982 | |
2f2dc053 | 2983 | { |
3d14c5d2 YS |
2984 | struct ceph_mds_client *mdsc; |
2985 | ||
2986 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
2987 | if (!mdsc) | |
2988 | return -ENOMEM; | |
2989 | mdsc->fsc = fsc; | |
2990 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
2991 | mutex_init(&mdsc->mutex); |
2992 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
2d06eeb8 CR |
2993 | if (mdsc->mdsmap == NULL) |
2994 | return -ENOMEM; | |
2995 | ||
2f2dc053 | 2996 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 2997 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
2998 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
2999 | mdsc->sessions = NULL; | |
3000 | mdsc->max_sessions = 0; | |
3001 | mdsc->stopping = 0; | |
3002 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 3003 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3004 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3005 | spin_lock_init(&mdsc->snap_empty_lock); | |
3006 | mdsc->last_tid = 0; | |
44ca18f2 | 3007 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3008 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3009 | mdsc->last_renew_caps = jiffies; | |
3010 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3011 | spin_lock_init(&mdsc->cap_delay_lock); | |
3012 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3013 | spin_lock_init(&mdsc->snap_flush_lock); | |
3014 | mdsc->cap_flush_seq = 0; | |
3015 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
db354052 | 3016 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3017 | mdsc->num_cap_flushing = 0; |
3018 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3019 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3020 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3021 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3022 | |
37151668 | 3023 | ceph_caps_init(mdsc); |
3d14c5d2 | 3024 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3025 | |
5f44f142 | 3026 | return 0; |
2f2dc053 SW |
3027 | } |
3028 | ||
3029 | /* | |
3030 | * Wait for safe replies on open mds requests. If we time out, drop | |
3031 | * all requests from the tree to avoid dangling dentry refs. | |
3032 | */ | |
3033 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3034 | { | |
3035 | struct ceph_mds_request *req; | |
3d14c5d2 | 3036 | struct ceph_fs_client *fsc = mdsc->fsc; |
2f2dc053 SW |
3037 | |
3038 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3039 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3040 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3041 | |
2f2dc053 SW |
3042 | dout("wait_requests waiting for requests\n"); |
3043 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
3d14c5d2 | 3044 | fsc->client->options->mount_timeout * HZ); |
2f2dc053 SW |
3045 | |
3046 | /* tear down remaining requests */ | |
44ca18f2 SW |
3047 | mutex_lock(&mdsc->mutex); |
3048 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3049 | dout("wait_requests timed out on tid %llu\n", |
3050 | req->r_tid); | |
44ca18f2 | 3051 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3052 | } |
3053 | } | |
3054 | mutex_unlock(&mdsc->mutex); | |
3055 | dout("wait_requests done\n"); | |
3056 | } | |
3057 | ||
3058 | /* | |
3059 | * called before mount is ro, and before dentries are torn down. | |
3060 | * (hmm, does this still race with new lookups?) | |
3061 | */ | |
3062 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3063 | { | |
3064 | dout("pre_umount\n"); | |
3065 | mdsc->stopping = 1; | |
3066 | ||
3067 | drop_leases(mdsc); | |
afcdaea3 | 3068 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3069 | wait_requests(mdsc); |
17c688c3 SW |
3070 | |
3071 | /* | |
3072 | * wait for reply handlers to drop their request refs and | |
3073 | * their inode/dcache refs | |
3074 | */ | |
3075 | ceph_msgr_flush(); | |
2f2dc053 SW |
3076 | } |
3077 | ||
3078 | /* | |
3079 | * wait for all write mds requests to flush. | |
3080 | */ | |
3081 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3082 | { | |
80fc7314 | 3083 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3084 | struct rb_node *n; |
2f2dc053 SW |
3085 | |
3086 | mutex_lock(&mdsc->mutex); | |
3087 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3088 | restart: |
44ca18f2 SW |
3089 | req = __get_oldest_req(mdsc); |
3090 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3091 | /* find next request */ |
3092 | n = rb_next(&req->r_node); | |
3093 | if (n) | |
3094 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3095 | else | |
3096 | nextreq = NULL; | |
44ca18f2 SW |
3097 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
3098 | /* write op */ | |
3099 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3100 | if (nextreq) |
3101 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3102 | mutex_unlock(&mdsc->mutex); |
3103 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3104 | req->r_tid, want_tid); | |
3105 | wait_for_completion(&req->r_safe_completion); | |
3106 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3107 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3108 | if (!nextreq) |
3109 | break; /* next dne before, so we're done! */ | |
3110 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3111 | /* next request was removed from tree */ | |
3112 | ceph_mdsc_put_request(nextreq); | |
3113 | goto restart; | |
3114 | } | |
3115 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3116 | } |
80fc7314 | 3117 | req = nextreq; |
2f2dc053 SW |
3118 | } |
3119 | mutex_unlock(&mdsc->mutex); | |
3120 | dout("wait_unsafe_requests done\n"); | |
3121 | } | |
3122 | ||
3123 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3124 | { | |
3125 | u64 want_tid, want_flush; | |
3126 | ||
3d14c5d2 | 3127 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3128 | return; |
3129 | ||
2f2dc053 SW |
3130 | dout("sync\n"); |
3131 | mutex_lock(&mdsc->mutex); | |
3132 | want_tid = mdsc->last_tid; | |
3133 | want_flush = mdsc->cap_flush_seq; | |
3134 | mutex_unlock(&mdsc->mutex); | |
3135 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
3136 | ||
afcdaea3 | 3137 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
3138 | |
3139 | wait_unsafe_requests(mdsc, want_tid); | |
3140 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
3141 | } | |
3142 | ||
f3c60c59 SW |
3143 | /* |
3144 | * true if all sessions are closed, or we force unmount | |
3145 | */ | |
3146 | bool done_closing_sessions(struct ceph_mds_client *mdsc) | |
3147 | { | |
3148 | int i, n = 0; | |
3149 | ||
3d14c5d2 | 3150 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 SW |
3151 | return true; |
3152 | ||
3153 | mutex_lock(&mdsc->mutex); | |
3154 | for (i = 0; i < mdsc->max_sessions; i++) | |
3155 | if (mdsc->sessions[i]) | |
3156 | n++; | |
3157 | mutex_unlock(&mdsc->mutex); | |
3158 | return n == 0; | |
3159 | } | |
2f2dc053 SW |
3160 | |
3161 | /* | |
3162 | * called after sb is ro. | |
3163 | */ | |
3164 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3165 | { | |
3166 | struct ceph_mds_session *session; | |
3167 | int i; | |
3d14c5d2 YS |
3168 | struct ceph_fs_client *fsc = mdsc->fsc; |
3169 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; | |
2f2dc053 SW |
3170 | |
3171 | dout("close_sessions\n"); | |
3172 | ||
2f2dc053 | 3173 | /* close sessions */ |
f3c60c59 SW |
3174 | mutex_lock(&mdsc->mutex); |
3175 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3176 | session = __ceph_lookup_mds_session(mdsc, i); | |
3177 | if (!session) | |
3178 | continue; | |
2f2dc053 | 3179 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3180 | mutex_lock(&session->s_mutex); |
3181 | __close_session(mdsc, session); | |
3182 | mutex_unlock(&session->s_mutex); | |
3183 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3184 | mutex_lock(&mdsc->mutex); |
3185 | } | |
f3c60c59 SW |
3186 | mutex_unlock(&mdsc->mutex); |
3187 | ||
3188 | dout("waiting for sessions to close\n"); | |
3189 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
3190 | timeout); | |
2f2dc053 SW |
3191 | |
3192 | /* tear down remaining sessions */ | |
f3c60c59 | 3193 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3194 | for (i = 0; i < mdsc->max_sessions; i++) { |
3195 | if (mdsc->sessions[i]) { | |
3196 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3197 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3198 | mutex_unlock(&mdsc->mutex); |
3199 | mutex_lock(&session->s_mutex); | |
3200 | remove_session_caps(session); | |
3201 | mutex_unlock(&session->s_mutex); | |
3202 | ceph_put_mds_session(session); | |
3203 | mutex_lock(&mdsc->mutex); | |
3204 | } | |
3205 | } | |
2f2dc053 | 3206 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3207 | mutex_unlock(&mdsc->mutex); |
3208 | ||
3209 | ceph_cleanup_empty_realms(mdsc); | |
3210 | ||
3211 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3212 | ||
3213 | dout("stopped\n"); | |
3214 | } | |
3215 | ||
3d14c5d2 | 3216 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3217 | { |
3218 | dout("stop\n"); | |
3219 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3220 | if (mdsc->mdsmap) | |
3221 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3222 | kfree(mdsc->sessions); | |
37151668 | 3223 | ceph_caps_finalize(mdsc); |
2f2dc053 SW |
3224 | } |
3225 | ||
3d14c5d2 YS |
3226 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3227 | { | |
3228 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3229 | ||
ef550f6f | 3230 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3231 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3232 | |
3233 | /* flush out any connection work with references to us */ | |
3234 | ceph_msgr_flush(); | |
3235 | ||
3d14c5d2 YS |
3236 | fsc->mdsc = NULL; |
3237 | kfree(mdsc); | |
ef550f6f | 3238 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3239 | } |
3240 | ||
2f2dc053 SW |
3241 | |
3242 | /* | |
3243 | * handle mds map update. | |
3244 | */ | |
3245 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
3246 | { | |
3247 | u32 epoch; | |
3248 | u32 maplen; | |
3249 | void *p = msg->front.iov_base; | |
3250 | void *end = p + msg->front.iov_len; | |
3251 | struct ceph_mdsmap *newmap, *oldmap; | |
3252 | struct ceph_fsid fsid; | |
3253 | int err = -EINVAL; | |
3254 | ||
3255 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3256 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3257 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3258 | return; |
c89136ea SW |
3259 | epoch = ceph_decode_32(&p); |
3260 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3261 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3262 | ||
3263 | /* do we need it? */ | |
3d14c5d2 | 3264 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
2f2dc053 SW |
3265 | mutex_lock(&mdsc->mutex); |
3266 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3267 | dout("handle_map epoch %u <= our %u\n", | |
3268 | epoch, mdsc->mdsmap->m_epoch); | |
3269 | mutex_unlock(&mdsc->mutex); | |
3270 | return; | |
3271 | } | |
3272 | ||
3273 | newmap = ceph_mdsmap_decode(&p, end); | |
3274 | if (IS_ERR(newmap)) { | |
3275 | err = PTR_ERR(newmap); | |
3276 | goto bad_unlock; | |
3277 | } | |
3278 | ||
3279 | /* swap into place */ | |
3280 | if (mdsc->mdsmap) { | |
3281 | oldmap = mdsc->mdsmap; | |
3282 | mdsc->mdsmap = newmap; | |
3283 | check_new_map(mdsc, newmap, oldmap); | |
3284 | ceph_mdsmap_destroy(oldmap); | |
3285 | } else { | |
3286 | mdsc->mdsmap = newmap; /* first mds map */ | |
3287 | } | |
3d14c5d2 | 3288 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3289 | |
3290 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3291 | ||
3292 | mutex_unlock(&mdsc->mutex); | |
3293 | schedule_delayed(mdsc); | |
3294 | return; | |
3295 | ||
3296 | bad_unlock: | |
3297 | mutex_unlock(&mdsc->mutex); | |
3298 | bad: | |
3299 | pr_err("error decoding mdsmap %d\n", err); | |
3300 | return; | |
3301 | } | |
3302 | ||
3303 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3304 | { | |
3305 | struct ceph_mds_session *s = con->private; | |
3306 | ||
3307 | if (get_session(s)) { | |
2600d2dd | 3308 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3309 | return con; |
3310 | } | |
3311 | dout("mdsc con_get %p FAIL\n", s); | |
3312 | return NULL; | |
3313 | } | |
3314 | ||
3315 | static void con_put(struct ceph_connection *con) | |
3316 | { | |
3317 | struct ceph_mds_session *s = con->private; | |
3318 | ||
7d8e18a6 | 3319 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3320 | ceph_put_mds_session(s); |
3321 | } | |
3322 | ||
3323 | /* | |
3324 | * if the client is unresponsive for long enough, the mds will kill | |
3325 | * the session entirely. | |
3326 | */ | |
3327 | static void peer_reset(struct ceph_connection *con) | |
3328 | { | |
3329 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3330 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3331 | |
7e70f0ed SW |
3332 | pr_warning("mds%d closed our session\n", s->s_mds); |
3333 | send_mds_reconnect(mdsc, s); | |
2f2dc053 SW |
3334 | } |
3335 | ||
3336 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3337 | { | |
3338 | struct ceph_mds_session *s = con->private; | |
3339 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3340 | int type = le16_to_cpu(msg->hdr.type); | |
3341 | ||
2600d2dd SW |
3342 | mutex_lock(&mdsc->mutex); |
3343 | if (__verify_registered_session(mdsc, s) < 0) { | |
3344 | mutex_unlock(&mdsc->mutex); | |
3345 | goto out; | |
3346 | } | |
3347 | mutex_unlock(&mdsc->mutex); | |
3348 | ||
2f2dc053 SW |
3349 | switch (type) { |
3350 | case CEPH_MSG_MDS_MAP: | |
3351 | ceph_mdsc_handle_map(mdsc, msg); | |
3352 | break; | |
3353 | case CEPH_MSG_CLIENT_SESSION: | |
3354 | handle_session(s, msg); | |
3355 | break; | |
3356 | case CEPH_MSG_CLIENT_REPLY: | |
3357 | handle_reply(s, msg); | |
3358 | break; | |
3359 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3360 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3361 | break; |
3362 | case CEPH_MSG_CLIENT_CAPS: | |
3363 | ceph_handle_caps(s, msg); | |
3364 | break; | |
3365 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3366 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3367 | break; |
3368 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3369 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3370 | break; |
3371 | ||
3372 | default: | |
3373 | pr_err("received unknown message type %d %s\n", type, | |
3374 | ceph_msg_type_name(type)); | |
3375 | } | |
2600d2dd | 3376 | out: |
2f2dc053 SW |
3377 | ceph_msg_put(msg); |
3378 | } | |
3379 | ||
4e7a5dcd SW |
3380 | /* |
3381 | * authentication | |
3382 | */ | |
3383 | static int get_authorizer(struct ceph_connection *con, | |
3384 | void **buf, int *len, int *proto, | |
3385 | void **reply_buf, int *reply_len, int force_new) | |
3386 | { | |
3387 | struct ceph_mds_session *s = con->private; | |
3388 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3389 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd SW |
3390 | int ret = 0; |
3391 | ||
3392 | if (force_new && s->s_authorizer) { | |
3393 | ac->ops->destroy_authorizer(ac, s->s_authorizer); | |
3394 | s->s_authorizer = NULL; | |
3395 | } | |
3396 | if (s->s_authorizer == NULL) { | |
3397 | if (ac->ops->create_authorizer) { | |
3398 | ret = ac->ops->create_authorizer( | |
3399 | ac, CEPH_ENTITY_TYPE_MDS, | |
3400 | &s->s_authorizer, | |
3401 | &s->s_authorizer_buf, | |
3402 | &s->s_authorizer_buf_len, | |
3403 | &s->s_authorizer_reply_buf, | |
3404 | &s->s_authorizer_reply_buf_len); | |
3405 | if (ret) | |
3406 | return ret; | |
3407 | } | |
3408 | } | |
3409 | ||
3410 | *proto = ac->protocol; | |
3411 | *buf = s->s_authorizer_buf; | |
3412 | *len = s->s_authorizer_buf_len; | |
3413 | *reply_buf = s->s_authorizer_reply_buf; | |
3414 | *reply_len = s->s_authorizer_reply_buf_len; | |
3415 | return 0; | |
3416 | } | |
3417 | ||
3418 | ||
3419 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3420 | { | |
3421 | struct ceph_mds_session *s = con->private; | |
3422 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3423 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd SW |
3424 | |
3425 | return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len); | |
3426 | } | |
3427 | ||
9bd2e6f8 SW |
3428 | static int invalidate_authorizer(struct ceph_connection *con) |
3429 | { | |
3430 | struct ceph_mds_session *s = con->private; | |
3431 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3432 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 SW |
3433 | |
3434 | if (ac->ops->invalidate_authorizer) | |
3435 | ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); | |
3436 | ||
3d14c5d2 | 3437 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3438 | } |
3439 | ||
9e32789f | 3440 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3441 | .get = con_get, |
3442 | .put = con_put, | |
3443 | .dispatch = dispatch, | |
4e7a5dcd SW |
3444 | .get_authorizer = get_authorizer, |
3445 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3446 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3447 | .peer_reset = peer_reset, |
2f2dc053 SW |
3448 | }; |
3449 | ||
2f2dc053 | 3450 | /* eof */ |