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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 | ||
1fe60e51 | 13 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
14 | #include <linux/ceph/messenger.h> |
15 | #include <linux/ceph/decode.h> | |
16 | #include <linux/ceph/pagelist.h> | |
17 | #include <linux/ceph/auth.h> | |
18 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
19 | |
20 | /* | |
21 | * A cluster of MDS (metadata server) daemons is responsible for | |
22 | * managing the file system namespace (the directory hierarchy and | |
23 | * inodes) and for coordinating shared access to storage. Metadata is | |
24 | * partitioning hierarchically across a number of servers, and that | |
25 | * partition varies over time as the cluster adjusts the distribution | |
26 | * in order to balance load. | |
27 | * | |
28 | * The MDS client is primarily responsible to managing synchronous | |
29 | * metadata requests for operations like open, unlink, and so forth. | |
30 | * If there is a MDS failure, we find out about it when we (possibly | |
31 | * request and) receive a new MDS map, and can resubmit affected | |
32 | * requests. | |
33 | * | |
34 | * For the most part, though, we take advantage of a lossless | |
35 | * communications channel to the MDS, and do not need to worry about | |
36 | * timing out or resubmitting requests. | |
37 | * | |
38 | * We maintain a stateful "session" with each MDS we interact with. | |
39 | * Within each session, we sent periodic heartbeat messages to ensure | |
40 | * any capabilities or leases we have been issues remain valid. If | |
41 | * the session times out and goes stale, our leases and capabilities | |
42 | * are no longer valid. | |
43 | */ | |
44 | ||
20cb34ae | 45 | struct ceph_reconnect_state { |
44c99757 | 46 | int nr_caps; |
20cb34ae SW |
47 | struct ceph_pagelist *pagelist; |
48 | bool flock; | |
49 | }; | |
50 | ||
2f2dc053 SW |
51 | static void __wake_requests(struct ceph_mds_client *mdsc, |
52 | struct list_head *head); | |
53 | ||
9e32789f | 54 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
55 | |
56 | ||
57 | /* | |
58 | * mds reply parsing | |
59 | */ | |
60 | ||
61 | /* | |
62 | * parse individual inode info | |
63 | */ | |
64 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 65 | struct ceph_mds_reply_info_in *info, |
12b4629a | 66 | u64 features) |
2f2dc053 SW |
67 | { |
68 | int err = -EIO; | |
69 | ||
70 | info->in = *p; | |
71 | *p += sizeof(struct ceph_mds_reply_inode) + | |
72 | sizeof(*info->in->fragtree.splits) * | |
73 | le32_to_cpu(info->in->fragtree.nsplits); | |
74 | ||
75 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
76 | ceph_decode_need(p, end, info->symlink_len, bad); | |
77 | info->symlink = *p; | |
78 | *p += info->symlink_len; | |
79 | ||
14303d20 SW |
80 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
81 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
82 | sizeof(info->dir_layout), bad); | |
83 | else | |
84 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
85 | ||
2f2dc053 SW |
86 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
87 | ceph_decode_need(p, end, info->xattr_len, bad); | |
88 | info->xattr_data = *p; | |
89 | *p += info->xattr_len; | |
90 | return 0; | |
91 | bad: | |
92 | return err; | |
93 | } | |
94 | ||
95 | /* | |
96 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
97 | * target inode. | |
98 | */ | |
99 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 100 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 101 | u64 features) |
2f2dc053 SW |
102 | { |
103 | int err; | |
104 | ||
105 | if (info->head->is_dentry) { | |
14303d20 | 106 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
107 | if (err < 0) |
108 | goto out_bad; | |
109 | ||
110 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
111 | goto bad; | |
112 | info->dirfrag = *p; | |
113 | *p += sizeof(*info->dirfrag) + | |
114 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
115 | if (unlikely(*p > end)) | |
116 | goto bad; | |
117 | ||
118 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
119 | ceph_decode_need(p, end, info->dname_len, bad); | |
120 | info->dname = *p; | |
121 | *p += info->dname_len; | |
122 | info->dlease = *p; | |
123 | *p += sizeof(*info->dlease); | |
124 | } | |
125 | ||
126 | if (info->head->is_target) { | |
14303d20 | 127 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
128 | if (err < 0) |
129 | goto out_bad; | |
130 | } | |
131 | ||
132 | if (unlikely(*p != end)) | |
133 | goto bad; | |
134 | return 0; | |
135 | ||
136 | bad: | |
137 | err = -EIO; | |
138 | out_bad: | |
139 | pr_err("problem parsing mds trace %d\n", err); | |
140 | return err; | |
141 | } | |
142 | ||
143 | /* | |
144 | * parse readdir results | |
145 | */ | |
146 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 147 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 148 | u64 features) |
2f2dc053 SW |
149 | { |
150 | u32 num, i = 0; | |
151 | int err; | |
152 | ||
153 | info->dir_dir = *p; | |
154 | if (*p + sizeof(*info->dir_dir) > end) | |
155 | goto bad; | |
156 | *p += sizeof(*info->dir_dir) + | |
157 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
158 | if (*p > end) | |
159 | goto bad; | |
160 | ||
161 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
162 | num = ceph_decode_32(p); |
163 | info->dir_end = ceph_decode_8(p); | |
164 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
165 | if (num == 0) |
166 | goto done; | |
167 | ||
168 | /* alloc large array */ | |
169 | info->dir_nr = num; | |
170 | info->dir_in = kcalloc(num, sizeof(*info->dir_in) + | |
171 | sizeof(*info->dir_dname) + | |
172 | sizeof(*info->dir_dname_len) + | |
173 | sizeof(*info->dir_dlease), | |
174 | GFP_NOFS); | |
175 | if (info->dir_in == NULL) { | |
176 | err = -ENOMEM; | |
177 | goto out_bad; | |
178 | } | |
179 | info->dir_dname = (void *)(info->dir_in + num); | |
180 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
181 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
182 | ||
183 | while (num) { | |
184 | /* dentry */ | |
185 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 186 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
187 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
188 | info->dir_dname[i] = *p; | |
189 | *p += info->dir_dname_len[i]; | |
190 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
191 | info->dir_dname[i]); | |
192 | info->dir_dlease[i] = *p; | |
193 | *p += sizeof(struct ceph_mds_reply_lease); | |
194 | ||
195 | /* inode */ | |
14303d20 | 196 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
2f2dc053 SW |
197 | if (err < 0) |
198 | goto out_bad; | |
199 | i++; | |
200 | num--; | |
201 | } | |
202 | ||
203 | done: | |
204 | if (*p != end) | |
205 | goto bad; | |
206 | return 0; | |
207 | ||
208 | bad: | |
209 | err = -EIO; | |
210 | out_bad: | |
211 | pr_err("problem parsing dir contents %d\n", err); | |
212 | return err; | |
213 | } | |
214 | ||
25933abd HS |
215 | /* |
216 | * parse fcntl F_GETLK results | |
217 | */ | |
218 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 219 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 220 | u64 features) |
25933abd HS |
221 | { |
222 | if (*p + sizeof(*info->filelock_reply) > end) | |
223 | goto bad; | |
224 | ||
225 | info->filelock_reply = *p; | |
226 | *p += sizeof(*info->filelock_reply); | |
227 | ||
228 | if (unlikely(*p != end)) | |
229 | goto bad; | |
230 | return 0; | |
231 | ||
232 | bad: | |
233 | return -EIO; | |
234 | } | |
235 | ||
6e8575fa SL |
236 | /* |
237 | * parse create results | |
238 | */ | |
239 | static int parse_reply_info_create(void **p, void *end, | |
240 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 241 | u64 features) |
6e8575fa SL |
242 | { |
243 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
244 | if (*p == end) { | |
245 | info->has_create_ino = false; | |
246 | } else { | |
247 | info->has_create_ino = true; | |
248 | info->ino = ceph_decode_64(p); | |
249 | } | |
250 | } | |
251 | ||
252 | if (unlikely(*p != end)) | |
253 | goto bad; | |
254 | return 0; | |
255 | ||
256 | bad: | |
257 | return -EIO; | |
258 | } | |
259 | ||
25933abd HS |
260 | /* |
261 | * parse extra results | |
262 | */ | |
263 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 264 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 265 | u64 features) |
25933abd HS |
266 | { |
267 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 268 | return parse_reply_info_filelock(p, end, info, features); |
8a034497 YZ |
269 | else if (info->head->op == CEPH_MDS_OP_READDIR || |
270 | info->head->op == CEPH_MDS_OP_LSSNAP) | |
14303d20 | 271 | return parse_reply_info_dir(p, end, info, features); |
6e8575fa SL |
272 | else if (info->head->op == CEPH_MDS_OP_CREATE) |
273 | return parse_reply_info_create(p, end, info, features); | |
274 | else | |
275 | return -EIO; | |
25933abd HS |
276 | } |
277 | ||
2f2dc053 SW |
278 | /* |
279 | * parse entire mds reply | |
280 | */ | |
281 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 282 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 283 | u64 features) |
2f2dc053 SW |
284 | { |
285 | void *p, *end; | |
286 | u32 len; | |
287 | int err; | |
288 | ||
289 | info->head = msg->front.iov_base; | |
290 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
291 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
292 | ||
293 | /* trace */ | |
294 | ceph_decode_32_safe(&p, end, len, bad); | |
295 | if (len > 0) { | |
32852a81 | 296 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 297 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
298 | if (err < 0) |
299 | goto out_bad; | |
300 | } | |
301 | ||
25933abd | 302 | /* extra */ |
2f2dc053 SW |
303 | ceph_decode_32_safe(&p, end, len, bad); |
304 | if (len > 0) { | |
32852a81 | 305 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 306 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
307 | if (err < 0) |
308 | goto out_bad; | |
309 | } | |
310 | ||
311 | /* snap blob */ | |
312 | ceph_decode_32_safe(&p, end, len, bad); | |
313 | info->snapblob_len = len; | |
314 | info->snapblob = p; | |
315 | p += len; | |
316 | ||
317 | if (p != end) | |
318 | goto bad; | |
319 | return 0; | |
320 | ||
321 | bad: | |
322 | err = -EIO; | |
323 | out_bad: | |
324 | pr_err("mds parse_reply err %d\n", err); | |
325 | return err; | |
326 | } | |
327 | ||
328 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
329 | { | |
330 | kfree(info->dir_in); | |
331 | } | |
332 | ||
333 | ||
334 | /* | |
335 | * sessions | |
336 | */ | |
337 | static const char *session_state_name(int s) | |
338 | { | |
339 | switch (s) { | |
340 | case CEPH_MDS_SESSION_NEW: return "new"; | |
341 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
342 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
343 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
344 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 345 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
346 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
347 | default: return "???"; | |
348 | } | |
349 | } | |
350 | ||
351 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
352 | { | |
353 | if (atomic_inc_not_zero(&s->s_ref)) { | |
354 | dout("mdsc get_session %p %d -> %d\n", s, | |
355 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
356 | return s; | |
357 | } else { | |
358 | dout("mdsc get_session %p 0 -- FAIL", s); | |
359 | return NULL; | |
360 | } | |
361 | } | |
362 | ||
363 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
364 | { | |
365 | dout("mdsc put_session %p %d -> %d\n", s, | |
366 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd | 367 | if (atomic_dec_and_test(&s->s_ref)) { |
6c4a1915 | 368 | if (s->s_auth.authorizer) |
27859f97 SW |
369 | ceph_auth_destroy_authorizer( |
370 | s->s_mdsc->fsc->client->monc.auth, | |
371 | s->s_auth.authorizer); | |
2f2dc053 | 372 | kfree(s); |
4e7a5dcd | 373 | } |
2f2dc053 SW |
374 | } |
375 | ||
376 | /* | |
377 | * called under mdsc->mutex | |
378 | */ | |
379 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
380 | int mds) | |
381 | { | |
382 | struct ceph_mds_session *session; | |
383 | ||
384 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
385 | return NULL; | |
386 | session = mdsc->sessions[mds]; | |
387 | dout("lookup_mds_session %p %d\n", session, | |
388 | atomic_read(&session->s_ref)); | |
389 | get_session(session); | |
390 | return session; | |
391 | } | |
392 | ||
393 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
394 | { | |
395 | if (mds >= mdsc->max_sessions) | |
396 | return false; | |
397 | return mdsc->sessions[mds]; | |
398 | } | |
399 | ||
2600d2dd SW |
400 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
401 | struct ceph_mds_session *s) | |
402 | { | |
403 | if (s->s_mds >= mdsc->max_sessions || | |
404 | mdsc->sessions[s->s_mds] != s) | |
405 | return -ENOENT; | |
406 | return 0; | |
407 | } | |
408 | ||
2f2dc053 SW |
409 | /* |
410 | * create+register a new session for given mds. | |
411 | * called under mdsc->mutex. | |
412 | */ | |
413 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
414 | int mds) | |
415 | { | |
416 | struct ceph_mds_session *s; | |
417 | ||
c338c07c NY |
418 | if (mds >= mdsc->mdsmap->m_max_mds) |
419 | return ERR_PTR(-EINVAL); | |
420 | ||
2f2dc053 | 421 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
422 | if (!s) |
423 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
424 | s->s_mdsc = mdsc; |
425 | s->s_mds = mds; | |
426 | s->s_state = CEPH_MDS_SESSION_NEW; | |
427 | s->s_ttl = 0; | |
428 | s->s_seq = 0; | |
429 | mutex_init(&s->s_mutex); | |
430 | ||
b7a9e5dd | 431 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 432 | |
d8fb02ab | 433 | spin_lock_init(&s->s_gen_ttl_lock); |
2f2dc053 | 434 | s->s_cap_gen = 0; |
1ce208a6 | 435 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
436 | |
437 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 SW |
438 | s->s_renew_requested = 0; |
439 | s->s_renew_seq = 0; | |
440 | INIT_LIST_HEAD(&s->s_caps); | |
441 | s->s_nr_caps = 0; | |
5dacf091 | 442 | s->s_trim_caps = 0; |
2f2dc053 SW |
443 | atomic_set(&s->s_ref, 1); |
444 | INIT_LIST_HEAD(&s->s_waiting); | |
445 | INIT_LIST_HEAD(&s->s_unsafe); | |
446 | s->s_num_cap_releases = 0; | |
99a9c273 | 447 | s->s_cap_reconnect = 0; |
7c1332b8 | 448 | s->s_cap_iterator = NULL; |
2f2dc053 SW |
449 | INIT_LIST_HEAD(&s->s_cap_releases); |
450 | INIT_LIST_HEAD(&s->s_cap_releases_done); | |
451 | INIT_LIST_HEAD(&s->s_cap_flushing); | |
452 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); | |
453 | ||
454 | dout("register_session mds%d\n", mds); | |
455 | if (mds >= mdsc->max_sessions) { | |
456 | int newmax = 1 << get_count_order(mds+1); | |
457 | struct ceph_mds_session **sa; | |
458 | ||
459 | dout("register_session realloc to %d\n", newmax); | |
460 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
461 | if (sa == NULL) | |
42ce56e5 | 462 | goto fail_realloc; |
2f2dc053 SW |
463 | if (mdsc->sessions) { |
464 | memcpy(sa, mdsc->sessions, | |
465 | mdsc->max_sessions * sizeof(void *)); | |
466 | kfree(mdsc->sessions); | |
467 | } | |
468 | mdsc->sessions = sa; | |
469 | mdsc->max_sessions = newmax; | |
470 | } | |
471 | mdsc->sessions[mds] = s; | |
472 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ | |
42ce56e5 | 473 | |
b7a9e5dd SW |
474 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
475 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 476 | |
2f2dc053 | 477 | return s; |
42ce56e5 SW |
478 | |
479 | fail_realloc: | |
480 | kfree(s); | |
481 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
482 | } |
483 | ||
484 | /* | |
485 | * called under mdsc->mutex | |
486 | */ | |
2600d2dd | 487 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 488 | struct ceph_mds_session *s) |
2f2dc053 | 489 | { |
2600d2dd SW |
490 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
491 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
492 | mdsc->sessions[s->s_mds] = NULL; |
493 | ceph_con_close(&s->s_con); | |
494 | ceph_put_mds_session(s); | |
2f2dc053 SW |
495 | } |
496 | ||
497 | /* | |
498 | * drop session refs in request. | |
499 | * | |
500 | * should be last request ref, or hold mdsc->mutex | |
501 | */ | |
502 | static void put_request_session(struct ceph_mds_request *req) | |
503 | { | |
504 | if (req->r_session) { | |
505 | ceph_put_mds_session(req->r_session); | |
506 | req->r_session = NULL; | |
507 | } | |
508 | } | |
509 | ||
153c8e6b | 510 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 511 | { |
153c8e6b SW |
512 | struct ceph_mds_request *req = container_of(kref, |
513 | struct ceph_mds_request, | |
514 | r_kref); | |
515 | if (req->r_request) | |
516 | ceph_msg_put(req->r_request); | |
517 | if (req->r_reply) { | |
518 | ceph_msg_put(req->r_reply); | |
519 | destroy_reply_info(&req->r_reply_info); | |
520 | } | |
521 | if (req->r_inode) { | |
41b02e1f | 522 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
523 | iput(req->r_inode); |
524 | } | |
525 | if (req->r_locked_dir) | |
41b02e1f | 526 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
153c8e6b SW |
527 | if (req->r_target_inode) |
528 | iput(req->r_target_inode); | |
529 | if (req->r_dentry) | |
530 | dput(req->r_dentry); | |
531 | if (req->r_old_dentry) { | |
41b02e1f SW |
532 | /* |
533 | * track (and drop pins for) r_old_dentry_dir | |
534 | * separately, since r_old_dentry's d_parent may have | |
535 | * changed between the dir mutex being dropped and | |
536 | * this request being freed. | |
537 | */ | |
538 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
539 | CEPH_CAP_PIN); | |
153c8e6b | 540 | dput(req->r_old_dentry); |
41b02e1f | 541 | iput(req->r_old_dentry_dir); |
2f2dc053 | 542 | } |
153c8e6b SW |
543 | kfree(req->r_path1); |
544 | kfree(req->r_path2); | |
545 | put_request_session(req); | |
37151668 | 546 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 547 | kfree(req); |
2f2dc053 SW |
548 | } |
549 | ||
550 | /* | |
551 | * lookup session, bump ref if found. | |
552 | * | |
553 | * called under mdsc->mutex. | |
554 | */ | |
555 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, | |
556 | u64 tid) | |
557 | { | |
558 | struct ceph_mds_request *req; | |
44ca18f2 SW |
559 | struct rb_node *n = mdsc->request_tree.rb_node; |
560 | ||
561 | while (n) { | |
562 | req = rb_entry(n, struct ceph_mds_request, r_node); | |
563 | if (tid < req->r_tid) | |
564 | n = n->rb_left; | |
565 | else if (tid > req->r_tid) | |
566 | n = n->rb_right; | |
567 | else { | |
568 | ceph_mdsc_get_request(req); | |
569 | return req; | |
570 | } | |
571 | } | |
572 | return NULL; | |
573 | } | |
574 | ||
575 | static void __insert_request(struct ceph_mds_client *mdsc, | |
576 | struct ceph_mds_request *new) | |
577 | { | |
578 | struct rb_node **p = &mdsc->request_tree.rb_node; | |
579 | struct rb_node *parent = NULL; | |
580 | struct ceph_mds_request *req = NULL; | |
581 | ||
582 | while (*p) { | |
583 | parent = *p; | |
584 | req = rb_entry(parent, struct ceph_mds_request, r_node); | |
585 | if (new->r_tid < req->r_tid) | |
586 | p = &(*p)->rb_left; | |
587 | else if (new->r_tid > req->r_tid) | |
588 | p = &(*p)->rb_right; | |
589 | else | |
590 | BUG(); | |
591 | } | |
592 | ||
593 | rb_link_node(&new->r_node, parent, p); | |
594 | rb_insert_color(&new->r_node, &mdsc->request_tree); | |
2f2dc053 SW |
595 | } |
596 | ||
597 | /* | |
598 | * Register an in-flight request, and assign a tid. Link to directory | |
599 | * are modifying (if any). | |
600 | * | |
601 | * Called under mdsc->mutex. | |
602 | */ | |
603 | static void __register_request(struct ceph_mds_client *mdsc, | |
604 | struct ceph_mds_request *req, | |
605 | struct inode *dir) | |
606 | { | |
607 | req->r_tid = ++mdsc->last_tid; | |
608 | if (req->r_num_caps) | |
37151668 YS |
609 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
610 | req->r_num_caps); | |
2f2dc053 SW |
611 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
612 | ceph_mdsc_get_request(req); | |
44ca18f2 | 613 | __insert_request(mdsc, req); |
2f2dc053 | 614 | |
cb4276cc SW |
615 | req->r_uid = current_fsuid(); |
616 | req->r_gid = current_fsgid(); | |
617 | ||
2f2dc053 SW |
618 | if (dir) { |
619 | struct ceph_inode_info *ci = ceph_inode(dir); | |
620 | ||
3b663780 | 621 | ihold(dir); |
2f2dc053 SW |
622 | spin_lock(&ci->i_unsafe_lock); |
623 | req->r_unsafe_dir = dir; | |
624 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
625 | spin_unlock(&ci->i_unsafe_lock); | |
626 | } | |
627 | } | |
628 | ||
629 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
630 | struct ceph_mds_request *req) | |
631 | { | |
632 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
44ca18f2 | 633 | rb_erase(&req->r_node, &mdsc->request_tree); |
80fc7314 | 634 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
635 | |
636 | if (req->r_unsafe_dir) { | |
637 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); | |
638 | ||
639 | spin_lock(&ci->i_unsafe_lock); | |
640 | list_del_init(&req->r_unsafe_dir_item); | |
641 | spin_unlock(&ci->i_unsafe_lock); | |
3b663780 SW |
642 | |
643 | iput(req->r_unsafe_dir); | |
644 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 645 | } |
94aa8ae1 | 646 | |
fc55d2c9 YZ |
647 | complete_all(&req->r_safe_completion); |
648 | ||
94aa8ae1 | 649 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
650 | } |
651 | ||
652 | /* | |
653 | * Choose mds to send request to next. If there is a hint set in the | |
654 | * request (e.g., due to a prior forward hint from the mds), use that. | |
655 | * Otherwise, consult frag tree and/or caps to identify the | |
656 | * appropriate mds. If all else fails, choose randomly. | |
657 | * | |
658 | * Called under mdsc->mutex. | |
659 | */ | |
7fd7d101 | 660 | static struct dentry *get_nonsnap_parent(struct dentry *dentry) |
eb6bb1c5 | 661 | { |
d79698da SW |
662 | /* |
663 | * we don't need to worry about protecting the d_parent access | |
664 | * here because we never renaming inside the snapped namespace | |
665 | * except to resplice to another snapdir, and either the old or new | |
666 | * result is a valid result. | |
667 | */ | |
eb6bb1c5 SW |
668 | while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) |
669 | dentry = dentry->d_parent; | |
670 | return dentry; | |
671 | } | |
672 | ||
2f2dc053 SW |
673 | static int __choose_mds(struct ceph_mds_client *mdsc, |
674 | struct ceph_mds_request *req) | |
675 | { | |
676 | struct inode *inode; | |
677 | struct ceph_inode_info *ci; | |
678 | struct ceph_cap *cap; | |
679 | int mode = req->r_direct_mode; | |
680 | int mds = -1; | |
681 | u32 hash = req->r_direct_hash; | |
682 | bool is_hash = req->r_direct_is_hash; | |
683 | ||
684 | /* | |
685 | * is there a specific mds we should try? ignore hint if we have | |
686 | * no session and the mds is not up (active or recovering). | |
687 | */ | |
688 | if (req->r_resend_mds >= 0 && | |
689 | (__have_session(mdsc, req->r_resend_mds) || | |
690 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
691 | dout("choose_mds using resend_mds mds%d\n", | |
692 | req->r_resend_mds); | |
693 | return req->r_resend_mds; | |
694 | } | |
695 | ||
696 | if (mode == USE_RANDOM_MDS) | |
697 | goto random; | |
698 | ||
699 | inode = NULL; | |
700 | if (req->r_inode) { | |
701 | inode = req->r_inode; | |
702 | } else if (req->r_dentry) { | |
d79698da SW |
703 | /* ignore race with rename; old or new d_parent is okay */ |
704 | struct dentry *parent = req->r_dentry->d_parent; | |
705 | struct inode *dir = parent->d_inode; | |
eb6bb1c5 | 706 | |
3d14c5d2 | 707 | if (dir->i_sb != mdsc->fsc->sb) { |
eb6bb1c5 SW |
708 | /* not this fs! */ |
709 | inode = req->r_dentry->d_inode; | |
710 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { | |
711 | /* direct snapped/virtual snapdir requests | |
712 | * based on parent dir inode */ | |
d79698da | 713 | struct dentry *dn = get_nonsnap_parent(parent); |
eb6bb1c5 SW |
714 | inode = dn->d_inode; |
715 | dout("__choose_mds using nonsnap parent %p\n", inode); | |
ca18bede | 716 | } else { |
eb6bb1c5 | 717 | /* dentry target */ |
2f2dc053 | 718 | inode = req->r_dentry->d_inode; |
ca18bede YZ |
719 | if (!inode || mode == USE_AUTH_MDS) { |
720 | /* dir + name */ | |
721 | inode = dir; | |
722 | hash = ceph_dentry_hash(dir, req->r_dentry); | |
723 | is_hash = true; | |
724 | } | |
2f2dc053 SW |
725 | } |
726 | } | |
eb6bb1c5 | 727 | |
2f2dc053 SW |
728 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
729 | (int)hash, mode); | |
730 | if (!inode) | |
731 | goto random; | |
732 | ci = ceph_inode(inode); | |
733 | ||
734 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
735 | struct ceph_inode_frag frag; | |
736 | int found; | |
737 | ||
738 | ceph_choose_frag(ci, hash, &frag, &found); | |
739 | if (found) { | |
740 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
741 | u8 r; | |
742 | ||
743 | /* choose a random replica */ | |
744 | get_random_bytes(&r, 1); | |
745 | r %= frag.ndist; | |
746 | mds = frag.dist[r]; | |
747 | dout("choose_mds %p %llx.%llx " | |
748 | "frag %u mds%d (%d/%d)\n", | |
749 | inode, ceph_vinop(inode), | |
d66bbd44 | 750 | frag.frag, mds, |
2f2dc053 | 751 | (int)r, frag.ndist); |
d66bbd44 SW |
752 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
753 | CEPH_MDS_STATE_ACTIVE) | |
754 | return mds; | |
2f2dc053 SW |
755 | } |
756 | ||
757 | /* since this file/dir wasn't known to be | |
758 | * replicated, then we want to look for the | |
759 | * authoritative mds. */ | |
760 | mode = USE_AUTH_MDS; | |
761 | if (frag.mds >= 0) { | |
762 | /* choose auth mds */ | |
763 | mds = frag.mds; | |
764 | dout("choose_mds %p %llx.%llx " | |
765 | "frag %u mds%d (auth)\n", | |
766 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
767 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
768 | CEPH_MDS_STATE_ACTIVE) | |
769 | return mds; | |
2f2dc053 SW |
770 | } |
771 | } | |
772 | } | |
773 | ||
be655596 | 774 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
775 | cap = NULL; |
776 | if (mode == USE_AUTH_MDS) | |
777 | cap = ci->i_auth_cap; | |
778 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
779 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
780 | if (!cap) { | |
be655596 | 781 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
782 | goto random; |
783 | } | |
784 | mds = cap->session->s_mds; | |
785 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
786 | inode, ceph_vinop(inode), mds, | |
787 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 788 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
789 | return mds; |
790 | ||
791 | random: | |
792 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
793 | dout("choose_mds chose random mds%d\n", mds); | |
794 | return mds; | |
795 | } | |
796 | ||
797 | ||
798 | /* | |
799 | * session messages | |
800 | */ | |
801 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
802 | { | |
803 | struct ceph_msg *msg; | |
804 | struct ceph_mds_session_head *h; | |
805 | ||
b61c2763 SW |
806 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
807 | false); | |
a79832f2 | 808 | if (!msg) { |
2f2dc053 | 809 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 810 | return NULL; |
2f2dc053 SW |
811 | } |
812 | h = msg->front.iov_base; | |
813 | h->op = cpu_to_le32(op); | |
814 | h->seq = cpu_to_le64(seq); | |
815 | return msg; | |
816 | } | |
817 | ||
818 | /* | |
819 | * send session open request. | |
820 | * | |
821 | * called under mdsc->mutex | |
822 | */ | |
823 | static int __open_session(struct ceph_mds_client *mdsc, | |
824 | struct ceph_mds_session *session) | |
825 | { | |
826 | struct ceph_msg *msg; | |
827 | int mstate; | |
828 | int mds = session->s_mds; | |
2f2dc053 SW |
829 | |
830 | /* wait for mds to go active? */ | |
831 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
832 | dout("open_session to mds%d (%s)\n", mds, | |
833 | ceph_mds_state_name(mstate)); | |
834 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
835 | session->s_renew_requested = jiffies; | |
836 | ||
837 | /* send connect message */ | |
838 | msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq); | |
a79832f2 SW |
839 | if (!msg) |
840 | return -ENOMEM; | |
2f2dc053 | 841 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
842 | return 0; |
843 | } | |
844 | ||
ed0552a1 SW |
845 | /* |
846 | * open sessions for any export targets for the given mds | |
847 | * | |
848 | * called under mdsc->mutex | |
849 | */ | |
5d72d13c YZ |
850 | static struct ceph_mds_session * |
851 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
852 | { | |
853 | struct ceph_mds_session *session; | |
854 | ||
855 | session = __ceph_lookup_mds_session(mdsc, target); | |
856 | if (!session) { | |
857 | session = register_session(mdsc, target); | |
858 | if (IS_ERR(session)) | |
859 | return session; | |
860 | } | |
861 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
862 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
863 | __open_session(mdsc, session); | |
864 | ||
865 | return session; | |
866 | } | |
867 | ||
868 | struct ceph_mds_session * | |
869 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
870 | { | |
871 | struct ceph_mds_session *session; | |
872 | ||
873 | dout("open_export_target_session to mds%d\n", target); | |
874 | ||
875 | mutex_lock(&mdsc->mutex); | |
876 | session = __open_export_target_session(mdsc, target); | |
877 | mutex_unlock(&mdsc->mutex); | |
878 | ||
879 | return session; | |
880 | } | |
881 | ||
ed0552a1 SW |
882 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
883 | struct ceph_mds_session *session) | |
884 | { | |
885 | struct ceph_mds_info *mi; | |
886 | struct ceph_mds_session *ts; | |
887 | int i, mds = session->s_mds; | |
ed0552a1 SW |
888 | |
889 | if (mds >= mdsc->mdsmap->m_max_mds) | |
890 | return; | |
5d72d13c | 891 | |
ed0552a1 SW |
892 | mi = &mdsc->mdsmap->m_info[mds]; |
893 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
894 | session->s_mds, mi->num_export_targets); | |
895 | ||
896 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c YZ |
897 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
898 | if (!IS_ERR(ts)) | |
899 | ceph_put_mds_session(ts); | |
ed0552a1 SW |
900 | } |
901 | } | |
902 | ||
154f42c2 SW |
903 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
904 | struct ceph_mds_session *session) | |
905 | { | |
906 | mutex_lock(&mdsc->mutex); | |
907 | __open_export_target_sessions(mdsc, session); | |
908 | mutex_unlock(&mdsc->mutex); | |
909 | } | |
910 | ||
2f2dc053 SW |
911 | /* |
912 | * session caps | |
913 | */ | |
914 | ||
915 | /* | |
916 | * Free preallocated cap messages assigned to this session | |
917 | */ | |
918 | static void cleanup_cap_releases(struct ceph_mds_session *session) | |
919 | { | |
920 | struct ceph_msg *msg; | |
921 | ||
922 | spin_lock(&session->s_cap_lock); | |
923 | while (!list_empty(&session->s_cap_releases)) { | |
924 | msg = list_first_entry(&session->s_cap_releases, | |
925 | struct ceph_msg, list_head); | |
926 | list_del_init(&msg->list_head); | |
927 | ceph_msg_put(msg); | |
928 | } | |
929 | while (!list_empty(&session->s_cap_releases_done)) { | |
930 | msg = list_first_entry(&session->s_cap_releases_done, | |
931 | struct ceph_msg, list_head); | |
932 | list_del_init(&msg->list_head); | |
933 | ceph_msg_put(msg); | |
934 | } | |
935 | spin_unlock(&session->s_cap_lock); | |
936 | } | |
937 | ||
938 | /* | |
f818a736 SW |
939 | * Helper to safely iterate over all caps associated with a session, with |
940 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 941 | * |
f818a736 | 942 | * Caller must hold session s_mutex. |
2f2dc053 SW |
943 | */ |
944 | static int iterate_session_caps(struct ceph_mds_session *session, | |
945 | int (*cb)(struct inode *, struct ceph_cap *, | |
946 | void *), void *arg) | |
947 | { | |
7c1332b8 SW |
948 | struct list_head *p; |
949 | struct ceph_cap *cap; | |
950 | struct inode *inode, *last_inode = NULL; | |
951 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
952 | int ret; |
953 | ||
954 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
955 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
956 | p = session->s_caps.next; |
957 | while (p != &session->s_caps) { | |
958 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 959 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
960 | if (!inode) { |
961 | p = p->next; | |
2f2dc053 | 962 | continue; |
7c1332b8 SW |
963 | } |
964 | session->s_cap_iterator = cap; | |
2f2dc053 | 965 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
966 | |
967 | if (last_inode) { | |
968 | iput(last_inode); | |
969 | last_inode = NULL; | |
970 | } | |
971 | if (old_cap) { | |
37151668 | 972 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
973 | old_cap = NULL; |
974 | } | |
975 | ||
2f2dc053 | 976 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
977 | last_inode = inode; |
978 | ||
2f2dc053 | 979 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
980 | p = p->next; |
981 | if (cap->ci == NULL) { | |
982 | dout("iterate_session_caps finishing cap %p removal\n", | |
983 | cap); | |
984 | BUG_ON(cap->session != session); | |
985 | list_del_init(&cap->session_caps); | |
986 | session->s_nr_caps--; | |
987 | cap->session = NULL; | |
988 | old_cap = cap; /* put_cap it w/o locks held */ | |
989 | } | |
5dacf091 SW |
990 | if (ret < 0) |
991 | goto out; | |
2f2dc053 | 992 | } |
5dacf091 SW |
993 | ret = 0; |
994 | out: | |
7c1332b8 | 995 | session->s_cap_iterator = NULL; |
2f2dc053 | 996 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
997 | |
998 | if (last_inode) | |
999 | iput(last_inode); | |
1000 | if (old_cap) | |
37151668 | 1001 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1002 | |
5dacf091 | 1003 | return ret; |
2f2dc053 SW |
1004 | } |
1005 | ||
1006 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1007 | void *arg) |
2f2dc053 SW |
1008 | { |
1009 | struct ceph_inode_info *ci = ceph_inode(inode); | |
6c99f254 SW |
1010 | int drop = 0; |
1011 | ||
2f2dc053 SW |
1012 | dout("removing cap %p, ci is %p, inode is %p\n", |
1013 | cap, ci, &ci->vfs_inode); | |
be655596 | 1014 | spin_lock(&ci->i_ceph_lock); |
a096b09a | 1015 | __ceph_remove_cap(cap, false); |
6c99f254 SW |
1016 | if (!__ceph_is_any_real_caps(ci)) { |
1017 | struct ceph_mds_client *mdsc = | |
3d14c5d2 | 1018 | ceph_sb_to_client(inode->i_sb)->mdsc; |
6c99f254 SW |
1019 | |
1020 | spin_lock(&mdsc->cap_dirty_lock); | |
1021 | if (!list_empty(&ci->i_dirty_item)) { | |
1022 | pr_info(" dropping dirty %s state for %p %lld\n", | |
1023 | ceph_cap_string(ci->i_dirty_caps), | |
1024 | inode, ceph_ino(inode)); | |
1025 | ci->i_dirty_caps = 0; | |
1026 | list_del_init(&ci->i_dirty_item); | |
1027 | drop = 1; | |
1028 | } | |
1029 | if (!list_empty(&ci->i_flushing_item)) { | |
1030 | pr_info(" dropping dirty+flushing %s state for %p %lld\n", | |
1031 | ceph_cap_string(ci->i_flushing_caps), | |
1032 | inode, ceph_ino(inode)); | |
1033 | ci->i_flushing_caps = 0; | |
1034 | list_del_init(&ci->i_flushing_item); | |
1035 | mdsc->num_cap_flushing--; | |
1036 | drop = 1; | |
1037 | } | |
1038 | if (drop && ci->i_wrbuffer_ref) { | |
1039 | pr_info(" dropping dirty data for %p %lld\n", | |
1040 | inode, ceph_ino(inode)); | |
1041 | ci->i_wrbuffer_ref = 0; | |
1042 | ci->i_wrbuffer_ref_head = 0; | |
1043 | drop++; | |
1044 | } | |
1045 | spin_unlock(&mdsc->cap_dirty_lock); | |
1046 | } | |
be655596 | 1047 | spin_unlock(&ci->i_ceph_lock); |
6c99f254 SW |
1048 | while (drop--) |
1049 | iput(inode); | |
2f2dc053 SW |
1050 | return 0; |
1051 | } | |
1052 | ||
1053 | /* | |
1054 | * caller must hold session s_mutex | |
1055 | */ | |
1056 | static void remove_session_caps(struct ceph_mds_session *session) | |
1057 | { | |
1058 | dout("remove_session_caps on %p\n", session); | |
1059 | iterate_session_caps(session, remove_session_caps_cb, NULL); | |
6f60f889 YZ |
1060 | |
1061 | spin_lock(&session->s_cap_lock); | |
1062 | if (session->s_nr_caps > 0) { | |
1063 | struct super_block *sb = session->s_mdsc->fsc->sb; | |
1064 | struct inode *inode; | |
1065 | struct ceph_cap *cap, *prev = NULL; | |
1066 | struct ceph_vino vino; | |
1067 | /* | |
1068 | * iterate_session_caps() skips inodes that are being | |
1069 | * deleted, we need to wait until deletions are complete. | |
1070 | * __wait_on_freeing_inode() is designed for the job, | |
1071 | * but it is not exported, so use lookup inode function | |
1072 | * to access it. | |
1073 | */ | |
1074 | while (!list_empty(&session->s_caps)) { | |
1075 | cap = list_entry(session->s_caps.next, | |
1076 | struct ceph_cap, session_caps); | |
1077 | if (cap == prev) | |
1078 | break; | |
1079 | prev = cap; | |
1080 | vino = cap->ci->i_vino; | |
1081 | spin_unlock(&session->s_cap_lock); | |
1082 | ||
ed284c49 | 1083 | inode = ceph_find_inode(sb, vino); |
6f60f889 YZ |
1084 | iput(inode); |
1085 | ||
1086 | spin_lock(&session->s_cap_lock); | |
1087 | } | |
1088 | } | |
1089 | spin_unlock(&session->s_cap_lock); | |
1090 | ||
2f2dc053 | 1091 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1092 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
2f2dc053 SW |
1093 | cleanup_cap_releases(session); |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * wake up any threads waiting on this session's caps. if the cap is | |
1098 | * old (didn't get renewed on the client reconnect), remove it now. | |
1099 | * | |
1100 | * caller must hold s_mutex. | |
1101 | */ | |
1102 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1103 | void *arg) | |
1104 | { | |
0dc2570f SW |
1105 | struct ceph_inode_info *ci = ceph_inode(inode); |
1106 | ||
03066f23 | 1107 | wake_up_all(&ci->i_cap_wq); |
0dc2570f | 1108 | if (arg) { |
be655596 | 1109 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1110 | ci->i_wanted_max_size = 0; |
1111 | ci->i_requested_max_size = 0; | |
be655596 | 1112 | spin_unlock(&ci->i_ceph_lock); |
0dc2570f | 1113 | } |
2f2dc053 SW |
1114 | return 0; |
1115 | } | |
1116 | ||
0dc2570f SW |
1117 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1118 | int reconnect) | |
2f2dc053 SW |
1119 | { |
1120 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1121 | iterate_session_caps(session, wake_up_session_cb, |
1122 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1123 | } |
1124 | ||
1125 | /* | |
1126 | * Send periodic message to MDS renewing all currently held caps. The | |
1127 | * ack will reset the expiration for all caps from this session. | |
1128 | * | |
1129 | * caller holds s_mutex | |
1130 | */ | |
1131 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1132 | struct ceph_mds_session *session) | |
1133 | { | |
1134 | struct ceph_msg *msg; | |
1135 | int state; | |
1136 | ||
1137 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1138 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1139 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1140 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1141 | |
1142 | /* do not try to renew caps until a recovering mds has reconnected | |
1143 | * with its clients. */ | |
1144 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1145 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1146 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1147 | session->s_mds, ceph_mds_state_name(state)); | |
1148 | return 0; | |
1149 | } | |
1150 | ||
1151 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1152 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1153 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1154 | ++session->s_renew_seq); | |
a79832f2 SW |
1155 | if (!msg) |
1156 | return -ENOMEM; | |
2f2dc053 SW |
1157 | ceph_con_send(&session->s_con, msg); |
1158 | return 0; | |
1159 | } | |
1160 | ||
186e4f7a YZ |
1161 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1162 | struct ceph_mds_session *session, u64 seq) | |
1163 | { | |
1164 | struct ceph_msg *msg; | |
1165 | ||
1166 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
1167 | session->s_mds, session_state_name(session->s_state), seq); | |
1168 | msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); | |
1169 | if (!msg) | |
1170 | return -ENOMEM; | |
1171 | ceph_con_send(&session->s_con, msg); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
1175 | ||
2f2dc053 SW |
1176 | /* |
1177 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1178 | * |
1179 | * Called under session->s_mutex | |
2f2dc053 SW |
1180 | */ |
1181 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1182 | struct ceph_mds_session *session, int is_renew) | |
1183 | { | |
1184 | int was_stale; | |
1185 | int wake = 0; | |
1186 | ||
1187 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1188 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1189 | |
1190 | session->s_cap_ttl = session->s_renew_requested + | |
1191 | mdsc->mdsmap->m_session_timeout*HZ; | |
1192 | ||
1193 | if (was_stale) { | |
1194 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1195 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1196 | wake = 1; | |
1197 | } else { | |
1198 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1199 | } | |
1200 | } | |
1201 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1202 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1203 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1204 | spin_unlock(&session->s_cap_lock); | |
1205 | ||
1206 | if (wake) | |
0dc2570f | 1207 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1208 | } |
1209 | ||
1210 | /* | |
1211 | * send a session close request | |
1212 | */ | |
1213 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1214 | struct ceph_mds_session *session) | |
1215 | { | |
1216 | struct ceph_msg *msg; | |
2f2dc053 SW |
1217 | |
1218 | dout("request_close_session mds%d state %s seq %lld\n", | |
1219 | session->s_mds, session_state_name(session->s_state), | |
1220 | session->s_seq); | |
1221 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1222 | if (!msg) |
1223 | return -ENOMEM; | |
1224 | ceph_con_send(&session->s_con, msg); | |
1225 | return 0; | |
2f2dc053 SW |
1226 | } |
1227 | ||
1228 | /* | |
1229 | * Called with s_mutex held. | |
1230 | */ | |
1231 | static int __close_session(struct ceph_mds_client *mdsc, | |
1232 | struct ceph_mds_session *session) | |
1233 | { | |
1234 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1235 | return 0; | |
1236 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1237 | return request_close_session(mdsc, session); | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Trim old(er) caps. | |
1242 | * | |
1243 | * Because we can't cache an inode without one or more caps, we do | |
1244 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1245 | * point the inode will hopefully get dropped to. | |
1246 | * | |
1247 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1248 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1249 | */ | |
1250 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1251 | { | |
1252 | struct ceph_mds_session *session = arg; | |
1253 | struct ceph_inode_info *ci = ceph_inode(inode); | |
979abfdd | 1254 | int used, wanted, oissued, mine; |
2f2dc053 SW |
1255 | |
1256 | if (session->s_trim_caps <= 0) | |
1257 | return -1; | |
1258 | ||
be655596 | 1259 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1260 | mine = cap->issued | cap->implemented; |
1261 | used = __ceph_caps_used(ci); | |
979abfdd | 1262 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1263 | oissued = __ceph_caps_issued_other(ci, cap); |
1264 | ||
979abfdd | 1265 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1266 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1267 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1268 | if (cap == ci->i_auth_cap) { | |
1269 | if (ci->i_dirty_caps | ci->i_flushing_caps) | |
1270 | goto out; | |
1271 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1272 | goto out; | |
1273 | } | |
1274 | if ((used | wanted) & ~oissued & mine) | |
2f2dc053 SW |
1275 | goto out; /* we need these caps */ |
1276 | ||
1277 | session->s_trim_caps--; | |
1278 | if (oissued) { | |
1279 | /* we aren't the only cap.. just remove us */ | |
a096b09a | 1280 | __ceph_remove_cap(cap, true); |
2f2dc053 SW |
1281 | } else { |
1282 | /* try to drop referring dentries */ | |
be655596 | 1283 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1284 | d_prune_aliases(inode); |
1285 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1286 | inode, cap, atomic_read(&inode->i_count)); | |
1287 | return 0; | |
1288 | } | |
1289 | ||
1290 | out: | |
be655596 | 1291 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1292 | return 0; |
1293 | } | |
1294 | ||
1295 | /* | |
1296 | * Trim session cap count down to some max number. | |
1297 | */ | |
1298 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1299 | struct ceph_mds_session *session, | |
1300 | int max_caps) | |
1301 | { | |
1302 | int trim_caps = session->s_nr_caps - max_caps; | |
1303 | ||
1304 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1305 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1306 | if (trim_caps > 0) { | |
1307 | session->s_trim_caps = trim_caps; | |
1308 | iterate_session_caps(session, trim_caps_cb, session); | |
1309 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1310 | session->s_mds, session->s_nr_caps, max_caps, | |
1311 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1312 | session->s_trim_caps = 0; |
2f2dc053 SW |
1313 | } |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Allocate cap_release messages. If there is a partially full message | |
1319 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1320 | * we can send it immediately. | |
1321 | * | |
1322 | * Called under s_mutex. | |
1323 | */ | |
2b2300d6 | 1324 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
ee6b272b | 1325 | struct ceph_mds_session *session) |
2f2dc053 | 1326 | { |
38e8883e | 1327 | struct ceph_msg *msg, *partial = NULL; |
2f2dc053 SW |
1328 | struct ceph_mds_cap_release *head; |
1329 | int err = -ENOMEM; | |
3d14c5d2 | 1330 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
38e8883e | 1331 | int num; |
2f2dc053 | 1332 | |
38e8883e SW |
1333 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
1334 | extra); | |
2f2dc053 SW |
1335 | |
1336 | spin_lock(&session->s_cap_lock); | |
1337 | ||
1338 | if (!list_empty(&session->s_cap_releases)) { | |
1339 | msg = list_first_entry(&session->s_cap_releases, | |
1340 | struct ceph_msg, | |
1341 | list_head); | |
1342 | head = msg->front.iov_base; | |
38e8883e SW |
1343 | num = le32_to_cpu(head->num); |
1344 | if (num) { | |
1345 | dout(" partial %p with (%d/%d)\n", msg, num, | |
1346 | (int)CEPH_CAPS_PER_RELEASE); | |
1347 | extra += CEPH_CAPS_PER_RELEASE - num; | |
1348 | partial = msg; | |
1349 | } | |
2f2dc053 | 1350 | } |
2f2dc053 SW |
1351 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
1352 | spin_unlock(&session->s_cap_lock); | |
34d23762 | 1353 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
b61c2763 | 1354 | GFP_NOFS, false); |
2f2dc053 SW |
1355 | if (!msg) |
1356 | goto out_unlocked; | |
1357 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1358 | (int)msg->front.iov_len); | |
1359 | head = msg->front.iov_base; | |
1360 | head->num = cpu_to_le32(0); | |
1361 | msg->front.iov_len = sizeof(*head); | |
1362 | spin_lock(&session->s_cap_lock); | |
1363 | list_add(&msg->list_head, &session->s_cap_releases); | |
1364 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1365 | } | |
1366 | ||
38e8883e SW |
1367 | if (partial) { |
1368 | head = partial->front.iov_base; | |
1369 | num = le32_to_cpu(head->num); | |
1370 | dout(" queueing partial %p with %d/%d\n", partial, num, | |
1371 | (int)CEPH_CAPS_PER_RELEASE); | |
1372 | list_move_tail(&partial->list_head, | |
1373 | &session->s_cap_releases_done); | |
1374 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; | |
2f2dc053 SW |
1375 | } |
1376 | err = 0; | |
1377 | spin_unlock(&session->s_cap_lock); | |
1378 | out_unlocked: | |
1379 | return err; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * flush all dirty inode data to disk. | |
1384 | * | |
1385 | * returns true if we've flushed through want_flush_seq | |
1386 | */ | |
1387 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1388 | { | |
1389 | int mds, ret = 1; | |
1390 | ||
1391 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1392 | mutex_lock(&mdsc->mutex); | |
1393 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1394 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1395 | ||
1396 | if (!session) | |
1397 | continue; | |
1398 | get_session(session); | |
1399 | mutex_unlock(&mdsc->mutex); | |
1400 | ||
1401 | mutex_lock(&session->s_mutex); | |
1402 | if (!list_empty(&session->s_cap_flushing)) { | |
1403 | struct ceph_inode_info *ci = | |
1404 | list_entry(session->s_cap_flushing.next, | |
1405 | struct ceph_inode_info, | |
1406 | i_flushing_item); | |
1407 | struct inode *inode = &ci->vfs_inode; | |
1408 | ||
be655596 | 1409 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1410 | if (ci->i_cap_flush_seq <= want_flush_seq) { |
1411 | dout("check_cap_flush still flushing %p " | |
1412 | "seq %lld <= %lld to mds%d\n", inode, | |
1413 | ci->i_cap_flush_seq, want_flush_seq, | |
1414 | session->s_mds); | |
1415 | ret = 0; | |
1416 | } | |
be655596 | 1417 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1418 | } |
1419 | mutex_unlock(&session->s_mutex); | |
1420 | ceph_put_mds_session(session); | |
1421 | ||
1422 | if (!ret) | |
1423 | return ret; | |
1424 | mutex_lock(&mdsc->mutex); | |
1425 | } | |
1426 | ||
1427 | mutex_unlock(&mdsc->mutex); | |
1428 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1429 | return ret; | |
1430 | } | |
1431 | ||
1432 | /* | |
1433 | * called under s_mutex | |
1434 | */ | |
3d7ded4d SW |
1435 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1436 | struct ceph_mds_session *session) | |
2f2dc053 SW |
1437 | { |
1438 | struct ceph_msg *msg; | |
1439 | ||
1440 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1441 | spin_lock(&session->s_cap_lock); |
1442 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1443 | msg = list_first_entry(&session->s_cap_releases_done, |
1444 | struct ceph_msg, list_head); | |
1445 | list_del_init(&msg->list_head); | |
1446 | spin_unlock(&session->s_cap_lock); | |
1447 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1448 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1449 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1450 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1451 | } |
1452 | spin_unlock(&session->s_cap_lock); | |
1453 | } | |
1454 | ||
e01a5946 SW |
1455 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1456 | struct ceph_mds_session *session) | |
1457 | { | |
1458 | struct ceph_msg *msg; | |
1459 | struct ceph_mds_cap_release *head; | |
1460 | unsigned num; | |
1461 | ||
1462 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
e01a5946 SW |
1463 | |
1464 | /* zero out the in-progress message */ | |
1465 | msg = list_first_entry(&session->s_cap_releases, | |
1466 | struct ceph_msg, list_head); | |
1467 | head = msg->front.iov_base; | |
1468 | num = le32_to_cpu(head->num); | |
1469 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num); | |
1470 | head->num = cpu_to_le32(0); | |
3803da49 | 1471 | msg->front.iov_len = sizeof(*head); |
e01a5946 SW |
1472 | session->s_num_cap_releases += num; |
1473 | ||
1474 | /* requeue completed messages */ | |
1475 | while (!list_empty(&session->s_cap_releases_done)) { | |
1476 | msg = list_first_entry(&session->s_cap_releases_done, | |
1477 | struct ceph_msg, list_head); | |
1478 | list_del_init(&msg->list_head); | |
1479 | ||
1480 | head = msg->front.iov_base; | |
1481 | num = le32_to_cpu(head->num); | |
1482 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1483 | num); | |
1484 | session->s_num_cap_releases += num; | |
1485 | head->num = cpu_to_le32(0); | |
1486 | msg->front.iov_len = sizeof(*head); | |
1487 | list_add(&msg->list_head, &session->s_cap_releases); | |
1488 | } | |
e01a5946 SW |
1489 | } |
1490 | ||
2f2dc053 SW |
1491 | /* |
1492 | * requests | |
1493 | */ | |
1494 | ||
1495 | /* | |
1496 | * Create an mds request. | |
1497 | */ | |
1498 | struct ceph_mds_request * | |
1499 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1500 | { | |
1501 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1502 | ||
1503 | if (!req) | |
1504 | return ERR_PTR(-ENOMEM); | |
1505 | ||
b4556396 | 1506 | mutex_init(&req->r_fill_mutex); |
37151668 | 1507 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1508 | req->r_started = jiffies; |
1509 | req->r_resend_mds = -1; | |
1510 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1511 | req->r_fmode = -1; | |
153c8e6b | 1512 | kref_init(&req->r_kref); |
2f2dc053 SW |
1513 | INIT_LIST_HEAD(&req->r_wait); |
1514 | init_completion(&req->r_completion); | |
1515 | init_completion(&req->r_safe_completion); | |
1516 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1517 | ||
1518 | req->r_op = op; | |
1519 | req->r_direct_mode = mode; | |
1520 | return req; | |
1521 | } | |
1522 | ||
1523 | /* | |
44ca18f2 | 1524 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1525 | * |
1526 | * called under mdsc->mutex. | |
1527 | */ | |
44ca18f2 SW |
1528 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1529 | { | |
1530 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1531 | return NULL; | |
1532 | return rb_entry(rb_first(&mdsc->request_tree), | |
1533 | struct ceph_mds_request, r_node); | |
1534 | } | |
1535 | ||
2f2dc053 SW |
1536 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1537 | { | |
44ca18f2 SW |
1538 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1539 | ||
1540 | if (req) | |
1541 | return req->r_tid; | |
1542 | return 0; | |
2f2dc053 SW |
1543 | } |
1544 | ||
1545 | /* | |
1546 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1547 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1548 | * | |
1549 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1550 | * inode. | |
1551 | * | |
1552 | * Encode hidden .snap dirs as a double /, i.e. | |
1553 | * foo/.snap/bar -> foo//bar | |
1554 | */ | |
1555 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1556 | int stop_on_nosnap) | |
1557 | { | |
1558 | struct dentry *temp; | |
1559 | char *path; | |
1560 | int len, pos; | |
1b71fe2e | 1561 | unsigned seq; |
2f2dc053 SW |
1562 | |
1563 | if (dentry == NULL) | |
1564 | return ERR_PTR(-EINVAL); | |
1565 | ||
1566 | retry: | |
1567 | len = 0; | |
1b71fe2e AV |
1568 | seq = read_seqbegin(&rename_lock); |
1569 | rcu_read_lock(); | |
2f2dc053 SW |
1570 | for (temp = dentry; !IS_ROOT(temp);) { |
1571 | struct inode *inode = temp->d_inode; | |
1572 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1573 | len++; /* slash only */ | |
1574 | else if (stop_on_nosnap && inode && | |
1575 | ceph_snap(inode) == CEPH_NOSNAP) | |
1576 | break; | |
1577 | else | |
1578 | len += 1 + temp->d_name.len; | |
1579 | temp = temp->d_parent; | |
2f2dc053 | 1580 | } |
1b71fe2e | 1581 | rcu_read_unlock(); |
2f2dc053 SW |
1582 | if (len) |
1583 | len--; /* no leading '/' */ | |
1584 | ||
1585 | path = kmalloc(len+1, GFP_NOFS); | |
1586 | if (path == NULL) | |
1587 | return ERR_PTR(-ENOMEM); | |
1588 | pos = len; | |
1589 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1590 | rcu_read_lock(); |
2f2dc053 | 1591 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1592 | struct inode *inode; |
2f2dc053 | 1593 | |
1b71fe2e AV |
1594 | spin_lock(&temp->d_lock); |
1595 | inode = temp->d_inode; | |
2f2dc053 | 1596 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1597 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1598 | pos, temp); |
1599 | } else if (stop_on_nosnap && inode && | |
1600 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1601 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1602 | break; |
1603 | } else { | |
1604 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1605 | if (pos < 0) { |
1606 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1607 | break; |
1b71fe2e | 1608 | } |
2f2dc053 SW |
1609 | strncpy(path + pos, temp->d_name.name, |
1610 | temp->d_name.len); | |
2f2dc053 | 1611 | } |
1b71fe2e | 1612 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1613 | if (pos) |
1614 | path[--pos] = '/'; | |
1615 | temp = temp->d_parent; | |
2f2dc053 | 1616 | } |
1b71fe2e AV |
1617 | rcu_read_unlock(); |
1618 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1619 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1620 | "expected, namelen is %d, pos is %d\n", len, pos); |
1621 | /* presumably this is only possible if racing with a | |
1622 | rename of one of the parent directories (we can not | |
1623 | lock the dentries above us to prevent this, but | |
1624 | retrying should be harmless) */ | |
1625 | kfree(path); | |
1626 | goto retry; | |
1627 | } | |
1628 | ||
1629 | *base = ceph_ino(temp->d_inode); | |
1630 | *plen = len; | |
104648ad | 1631 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1632 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1633 | return path; |
1634 | } | |
1635 | ||
1636 | static int build_dentry_path(struct dentry *dentry, | |
1637 | const char **ppath, int *ppathlen, u64 *pino, | |
1638 | int *pfreepath) | |
1639 | { | |
1640 | char *path; | |
1641 | ||
1642 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1643 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1644 | *ppath = dentry->d_name.name; | |
1645 | *ppathlen = dentry->d_name.len; | |
1646 | return 0; | |
1647 | } | |
1648 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1649 | if (IS_ERR(path)) | |
1650 | return PTR_ERR(path); | |
1651 | *ppath = path; | |
1652 | *pfreepath = 1; | |
1653 | return 0; | |
1654 | } | |
1655 | ||
1656 | static int build_inode_path(struct inode *inode, | |
1657 | const char **ppath, int *ppathlen, u64 *pino, | |
1658 | int *pfreepath) | |
1659 | { | |
1660 | struct dentry *dentry; | |
1661 | char *path; | |
1662 | ||
1663 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1664 | *pino = ceph_ino(inode); | |
1665 | *ppathlen = 0; | |
1666 | return 0; | |
1667 | } | |
1668 | dentry = d_find_alias(inode); | |
1669 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1670 | dput(dentry); | |
1671 | if (IS_ERR(path)) | |
1672 | return PTR_ERR(path); | |
1673 | *ppath = path; | |
1674 | *pfreepath = 1; | |
1675 | return 0; | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * request arguments may be specified via an inode *, a dentry *, or | |
1680 | * an explicit ino+path. | |
1681 | */ | |
1682 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1683 | const char *rpath, u64 rino, | |
1684 | const char **ppath, int *pathlen, | |
1685 | u64 *ino, int *freepath) | |
1686 | { | |
1687 | int r = 0; | |
1688 | ||
1689 | if (rinode) { | |
1690 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1691 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1692 | ceph_snap(rinode)); | |
1693 | } else if (rdentry) { | |
1694 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1695 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1696 | *ppath); | |
795858db | 1697 | } else if (rpath || rino) { |
2f2dc053 SW |
1698 | *ino = rino; |
1699 | *ppath = rpath; | |
b000056a | 1700 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1701 | dout(" path %.*s\n", *pathlen, rpath); |
1702 | } | |
1703 | ||
1704 | return r; | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * called under mdsc->mutex | |
1709 | */ | |
1710 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1711 | struct ceph_mds_request *req, | |
1712 | int mds) | |
1713 | { | |
1714 | struct ceph_msg *msg; | |
1715 | struct ceph_mds_request_head *head; | |
1716 | const char *path1 = NULL; | |
1717 | const char *path2 = NULL; | |
1718 | u64 ino1 = 0, ino2 = 0; | |
1719 | int pathlen1 = 0, pathlen2 = 0; | |
1720 | int freepath1 = 0, freepath2 = 0; | |
1721 | int len; | |
1722 | u16 releases; | |
1723 | void *p, *end; | |
1724 | int ret; | |
1725 | ||
1726 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1727 | req->r_path1, req->r_ino1.ino, | |
1728 | &path1, &pathlen1, &ino1, &freepath1); | |
1729 | if (ret < 0) { | |
1730 | msg = ERR_PTR(ret); | |
1731 | goto out; | |
1732 | } | |
1733 | ||
1734 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1735 | req->r_path2, req->r_ino2.ino, | |
1736 | &path2, &pathlen2, &ino2, &freepath2); | |
1737 | if (ret < 0) { | |
1738 | msg = ERR_PTR(ret); | |
1739 | goto out_free1; | |
1740 | } | |
1741 | ||
1742 | len = sizeof(*head) + | |
ac8839d7 | 1743 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)); |
2f2dc053 SW |
1744 | |
1745 | /* calculate (max) length for cap releases */ | |
1746 | len += sizeof(struct ceph_mds_request_release) * | |
1747 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1748 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1749 | if (req->r_dentry_drop) | |
1750 | len += req->r_dentry->d_name.len; | |
1751 | if (req->r_old_dentry_drop) | |
1752 | len += req->r_old_dentry->d_name.len; | |
1753 | ||
b61c2763 | 1754 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
1755 | if (!msg) { |
1756 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1757 | goto out_free2; |
a79832f2 | 1758 | } |
2f2dc053 | 1759 | |
6df058c0 SW |
1760 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1761 | ||
2f2dc053 SW |
1762 | head = msg->front.iov_base; |
1763 | p = msg->front.iov_base + sizeof(*head); | |
1764 | end = msg->front.iov_base + msg->front.iov_len; | |
1765 | ||
1766 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1767 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
1768 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
1769 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
1770 | head->args = req->r_args; |
1771 | ||
1772 | ceph_encode_filepath(&p, end, ino1, path1); | |
1773 | ceph_encode_filepath(&p, end, ino2, path2); | |
1774 | ||
e979cf50 SW |
1775 | /* make note of release offset, in case we need to replay */ |
1776 | req->r_request_release_offset = p - msg->front.iov_base; | |
1777 | ||
2f2dc053 SW |
1778 | /* cap releases */ |
1779 | releases = 0; | |
1780 | if (req->r_inode_drop) | |
1781 | releases += ceph_encode_inode_release(&p, | |
1782 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1783 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1784 | if (req->r_dentry_drop) | |
1785 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1786 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1787 | if (req->r_old_dentry_drop) | |
1788 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1789 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1790 | if (req->r_old_inode_drop) | |
1791 | releases += ceph_encode_inode_release(&p, | |
1792 | req->r_old_dentry->d_inode, | |
1793 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1794 | head->num_releases = cpu_to_le16(releases); | |
1795 | ||
1796 | BUG_ON(p > end); | |
1797 | msg->front.iov_len = p - msg->front.iov_base; | |
1798 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1799 | ||
ebf18f47 AE |
1800 | if (req->r_data_len) { |
1801 | /* outbound data set only by ceph_sync_setxattr() */ | |
1802 | BUG_ON(!req->r_pages); | |
90af3602 | 1803 | ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0); |
ebf18f47 | 1804 | } |
02afca6c | 1805 | |
2f2dc053 SW |
1806 | msg->hdr.data_len = cpu_to_le32(req->r_data_len); |
1807 | msg->hdr.data_off = cpu_to_le16(0); | |
1808 | ||
1809 | out_free2: | |
1810 | if (freepath2) | |
1811 | kfree((char *)path2); | |
1812 | out_free1: | |
1813 | if (freepath1) | |
1814 | kfree((char *)path1); | |
1815 | out: | |
1816 | return msg; | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * called under mdsc->mutex if error, under no mutex if | |
1821 | * success. | |
1822 | */ | |
1823 | static void complete_request(struct ceph_mds_client *mdsc, | |
1824 | struct ceph_mds_request *req) | |
1825 | { | |
1826 | if (req->r_callback) | |
1827 | req->r_callback(mdsc, req); | |
1828 | else | |
03066f23 | 1829 | complete_all(&req->r_completion); |
2f2dc053 SW |
1830 | } |
1831 | ||
1832 | /* | |
1833 | * called under mdsc->mutex | |
1834 | */ | |
1835 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1836 | struct ceph_mds_request *req, | |
1837 | int mds) | |
1838 | { | |
1839 | struct ceph_mds_request_head *rhead; | |
1840 | struct ceph_msg *msg; | |
1841 | int flags = 0; | |
1842 | ||
2f2dc053 | 1843 | req->r_attempts++; |
e55b71f8 GF |
1844 | if (req->r_inode) { |
1845 | struct ceph_cap *cap = | |
1846 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
1847 | ||
1848 | if (cap) | |
1849 | req->r_sent_on_mseq = cap->mseq; | |
1850 | else | |
1851 | req->r_sent_on_mseq = -1; | |
1852 | } | |
2f2dc053 SW |
1853 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
1854 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1855 | ||
01a92f17 SW |
1856 | if (req->r_got_unsafe) { |
1857 | /* | |
1858 | * Replay. Do not regenerate message (and rebuild | |
1859 | * paths, etc.); just use the original message. | |
1860 | * Rebuilding paths will break for renames because | |
1861 | * d_move mangles the src name. | |
1862 | */ | |
1863 | msg = req->r_request; | |
1864 | rhead = msg->front.iov_base; | |
1865 | ||
1866 | flags = le32_to_cpu(rhead->flags); | |
1867 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1868 | rhead->flags = cpu_to_le32(flags); | |
1869 | ||
1870 | if (req->r_target_inode) | |
1871 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
1872 | ||
1873 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
1874 | |
1875 | /* remove cap/dentry releases from message */ | |
1876 | rhead->num_releases = 0; | |
1877 | msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset); | |
1878 | msg->front.iov_len = req->r_request_release_offset; | |
01a92f17 SW |
1879 | return 0; |
1880 | } | |
1881 | ||
2f2dc053 SW |
1882 | if (req->r_request) { |
1883 | ceph_msg_put(req->r_request); | |
1884 | req->r_request = NULL; | |
1885 | } | |
1886 | msg = create_request_message(mdsc, req, mds); | |
1887 | if (IS_ERR(msg)) { | |
e1518c7c | 1888 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 1889 | complete_request(mdsc, req); |
a79832f2 | 1890 | return PTR_ERR(msg); |
2f2dc053 SW |
1891 | } |
1892 | req->r_request = msg; | |
1893 | ||
1894 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
1895 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
1896 | if (req->r_got_unsafe) | |
1897 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1898 | if (req->r_locked_dir) | |
1899 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
1900 | rhead->flags = cpu_to_le32(flags); | |
1901 | rhead->num_fwd = req->r_num_fwd; | |
1902 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 1903 | rhead->ino = 0; |
2f2dc053 SW |
1904 | |
1905 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
1906 | return 0; |
1907 | } | |
1908 | ||
1909 | /* | |
1910 | * send request, or put it on the appropriate wait list. | |
1911 | */ | |
1912 | static int __do_request(struct ceph_mds_client *mdsc, | |
1913 | struct ceph_mds_request *req) | |
1914 | { | |
1915 | struct ceph_mds_session *session = NULL; | |
1916 | int mds = -1; | |
1917 | int err = -EAGAIN; | |
1918 | ||
eb1b8af3 YZ |
1919 | if (req->r_err || req->r_got_result) { |
1920 | if (req->r_aborted) | |
1921 | __unregister_request(mdsc, req); | |
2f2dc053 | 1922 | goto out; |
eb1b8af3 | 1923 | } |
2f2dc053 SW |
1924 | |
1925 | if (req->r_timeout && | |
1926 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
1927 | dout("do_request timed out\n"); | |
1928 | err = -EIO; | |
1929 | goto finish; | |
1930 | } | |
1931 | ||
dc69e2e9 SW |
1932 | put_request_session(req); |
1933 | ||
2f2dc053 SW |
1934 | mds = __choose_mds(mdsc, req); |
1935 | if (mds < 0 || | |
1936 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
1937 | dout("do_request no mds or not active, waiting for map\n"); | |
1938 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
1939 | goto out; | |
1940 | } | |
1941 | ||
1942 | /* get, open session */ | |
1943 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 1944 | if (!session) { |
2f2dc053 | 1945 | session = register_session(mdsc, mds); |
9c423956 SW |
1946 | if (IS_ERR(session)) { |
1947 | err = PTR_ERR(session); | |
1948 | goto finish; | |
1949 | } | |
1950 | } | |
dc69e2e9 SW |
1951 | req->r_session = get_session(session); |
1952 | ||
2f2dc053 SW |
1953 | dout("do_request mds%d session %p state %s\n", mds, session, |
1954 | session_state_name(session->s_state)); | |
1955 | if (session->s_state != CEPH_MDS_SESSION_OPEN && | |
1956 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
1957 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
1958 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
1959 | __open_session(mdsc, session); | |
1960 | list_add(&req->r_wait, &session->s_waiting); | |
1961 | goto out_session; | |
1962 | } | |
1963 | ||
1964 | /* send request */ | |
2f2dc053 SW |
1965 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
1966 | ||
1967 | if (req->r_request_started == 0) /* note request start time */ | |
1968 | req->r_request_started = jiffies; | |
1969 | ||
1970 | err = __prepare_send_request(mdsc, req, mds); | |
1971 | if (!err) { | |
1972 | ceph_msg_get(req->r_request); | |
1973 | ceph_con_send(&session->s_con, req->r_request); | |
1974 | } | |
1975 | ||
1976 | out_session: | |
1977 | ceph_put_mds_session(session); | |
1978 | out: | |
1979 | return err; | |
1980 | ||
1981 | finish: | |
e1518c7c | 1982 | req->r_err = err; |
2f2dc053 SW |
1983 | complete_request(mdsc, req); |
1984 | goto out; | |
1985 | } | |
1986 | ||
1987 | /* | |
1988 | * called under mdsc->mutex | |
1989 | */ | |
1990 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
1991 | struct list_head *head) | |
1992 | { | |
ed75ec2c YZ |
1993 | struct ceph_mds_request *req; |
1994 | LIST_HEAD(tmp_list); | |
1995 | ||
1996 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 1997 | |
ed75ec2c YZ |
1998 | while (!list_empty(&tmp_list)) { |
1999 | req = list_entry(tmp_list.next, | |
2000 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2001 | list_del_init(&req->r_wait); |
7971bd92 | 2002 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2003 | __do_request(mdsc, req); |
2004 | } | |
2005 | } | |
2006 | ||
2007 | /* | |
2008 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2009 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2010 | */ |
29790f26 | 2011 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2012 | { |
44ca18f2 SW |
2013 | struct ceph_mds_request *req; |
2014 | struct rb_node *p; | |
2f2dc053 SW |
2015 | |
2016 | dout("kick_requests mds%d\n", mds); | |
44ca18f2 SW |
2017 | for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
2018 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
2019 | if (req->r_got_unsafe) | |
2020 | continue; | |
2021 | if (req->r_session && | |
2022 | req->r_session->s_mds == mds) { | |
2023 | dout(" kicking tid %llu\n", req->r_tid); | |
44ca18f2 | 2024 | __do_request(mdsc, req); |
2f2dc053 SW |
2025 | } |
2026 | } | |
2027 | } | |
2028 | ||
2029 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2030 | struct ceph_mds_request *req) | |
2031 | { | |
2032 | dout("submit_request on %p\n", req); | |
2033 | mutex_lock(&mdsc->mutex); | |
2034 | __register_request(mdsc, req, NULL); | |
2035 | __do_request(mdsc, req); | |
2036 | mutex_unlock(&mdsc->mutex); | |
2037 | } | |
2038 | ||
2039 | /* | |
2040 | * Synchrously perform an mds request. Take care of all of the | |
2041 | * session setup, forwarding, retry details. | |
2042 | */ | |
2043 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2044 | struct inode *dir, | |
2045 | struct ceph_mds_request *req) | |
2046 | { | |
2047 | int err; | |
2048 | ||
2049 | dout("do_request on %p\n", req); | |
2050 | ||
2051 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
2052 | if (req->r_inode) | |
2053 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
2054 | if (req->r_locked_dir) | |
2055 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
2056 | if (req->r_old_dentry) | |
41b02e1f SW |
2057 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2058 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2059 | |
2060 | /* issue */ | |
2061 | mutex_lock(&mdsc->mutex); | |
2062 | __register_request(mdsc, req, dir); | |
2063 | __do_request(mdsc, req); | |
2064 | ||
e1518c7c SW |
2065 | if (req->r_err) { |
2066 | err = req->r_err; | |
2067 | __unregister_request(mdsc, req); | |
2068 | dout("do_request early error %d\n", err); | |
2069 | goto out; | |
2f2dc053 SW |
2070 | } |
2071 | ||
e1518c7c SW |
2072 | /* wait */ |
2073 | mutex_unlock(&mdsc->mutex); | |
2074 | dout("do_request waiting\n"); | |
2075 | if (req->r_timeout) { | |
aa91647c | 2076 | err = (long)wait_for_completion_killable_timeout( |
e1518c7c SW |
2077 | &req->r_completion, req->r_timeout); |
2078 | if (err == 0) | |
2079 | err = -EIO; | |
2080 | } else { | |
aa91647c | 2081 | err = wait_for_completion_killable(&req->r_completion); |
e1518c7c SW |
2082 | } |
2083 | dout("do_request waited, got %d\n", err); | |
2084 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2085 | |
e1518c7c SW |
2086 | /* only abort if we didn't race with a real reply */ |
2087 | if (req->r_got_result) { | |
2088 | err = le32_to_cpu(req->r_reply_info.head->result); | |
2089 | } else if (err < 0) { | |
2090 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2091 | |
2092 | /* | |
2093 | * ensure we aren't running concurrently with | |
2094 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2095 | * rely on locks (dir mutex) held by our caller. | |
2096 | */ | |
2097 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
2098 | req->r_err = err; |
2099 | req->r_aborted = true; | |
b4556396 | 2100 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2101 | |
e1518c7c | 2102 | if (req->r_locked_dir && |
167c9e35 SW |
2103 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2104 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2105 | } else { |
e1518c7c | 2106 | err = req->r_err; |
2f2dc053 | 2107 | } |
2f2dc053 | 2108 | |
e1518c7c SW |
2109 | out: |
2110 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2111 | dout("do_request %p done, result %d\n", req, err); |
2112 | return err; | |
2113 | } | |
2114 | ||
167c9e35 | 2115 | /* |
2f276c51 | 2116 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2117 | * namespace request. |
2118 | */ | |
2119 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2120 | { | |
2121 | struct inode *inode = req->r_locked_dir; | |
167c9e35 | 2122 | |
2f276c51 | 2123 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2124 | |
2f276c51 | 2125 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2126 | if (req->r_dentry) |
2127 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2128 | if (req->r_old_dentry) | |
2129 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2130 | } | |
2131 | ||
2f2dc053 SW |
2132 | /* |
2133 | * Handle mds reply. | |
2134 | * | |
2135 | * We take the session mutex and parse and process the reply immediately. | |
2136 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2137 | * by the MDS as they are applied to our local cache. | |
2138 | */ | |
2139 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2140 | { | |
2141 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2142 | struct ceph_mds_request *req; | |
2143 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2144 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
2145 | u64 tid; | |
2146 | int err, result; | |
2600d2dd | 2147 | int mds = session->s_mds; |
2f2dc053 | 2148 | |
2f2dc053 SW |
2149 | if (msg->front.iov_len < sizeof(*head)) { |
2150 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2151 | ceph_msg_dump(msg); |
2f2dc053 SW |
2152 | return; |
2153 | } | |
2154 | ||
2155 | /* get request, session */ | |
6df058c0 | 2156 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2157 | mutex_lock(&mdsc->mutex); |
2158 | req = __lookup_request(mdsc, tid); | |
2159 | if (!req) { | |
2160 | dout("handle_reply on unknown tid %llu\n", tid); | |
2161 | mutex_unlock(&mdsc->mutex); | |
2162 | return; | |
2163 | } | |
2164 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2165 | |
2166 | /* correct session? */ | |
d96d6049 | 2167 | if (req->r_session != session) { |
2f2dc053 SW |
2168 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2169 | " not mds%d\n", tid, session->s_mds, | |
2170 | req->r_session ? req->r_session->s_mds : -1); | |
2171 | mutex_unlock(&mdsc->mutex); | |
2172 | goto out; | |
2173 | } | |
2174 | ||
2175 | /* dup? */ | |
2176 | if ((req->r_got_unsafe && !head->safe) || | |
2177 | (req->r_got_safe && head->safe)) { | |
2178 | pr_warning("got a dup %s reply on %llu from mds%d\n", | |
2179 | head->safe ? "safe" : "unsafe", tid, mds); | |
2180 | mutex_unlock(&mdsc->mutex); | |
2181 | goto out; | |
2182 | } | |
85792d0d SW |
2183 | if (req->r_got_safe && !head->safe) { |
2184 | pr_warning("got unsafe after safe on %llu from mds%d\n", | |
2185 | tid, mds); | |
2186 | mutex_unlock(&mdsc->mutex); | |
2187 | goto out; | |
2188 | } | |
2f2dc053 SW |
2189 | |
2190 | result = le32_to_cpu(head->result); | |
2191 | ||
2192 | /* | |
e55b71f8 GF |
2193 | * Handle an ESTALE |
2194 | * if we're not talking to the authority, send to them | |
2195 | * if the authority has changed while we weren't looking, | |
2196 | * send to new authority | |
2197 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2198 | */ |
2199 | if (result == -ESTALE) { | |
e55b71f8 | 2200 | dout("got ESTALE on request %llu", req->r_tid); |
ca18bede | 2201 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2202 | dout("not using auth, setting for that now"); |
2203 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2204 | __do_request(mdsc, req); |
2205 | mutex_unlock(&mdsc->mutex); | |
2206 | goto out; | |
e55b71f8 | 2207 | } else { |
ca18bede YZ |
2208 | int mds = __choose_mds(mdsc, req); |
2209 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2210 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2211 | __do_request(mdsc, req); |
2212 | mutex_unlock(&mdsc->mutex); | |
2213 | goto out; | |
2214 | } | |
2f2dc053 | 2215 | } |
e55b71f8 | 2216 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2217 | } |
2218 | ||
e55b71f8 | 2219 | |
2f2dc053 SW |
2220 | if (head->safe) { |
2221 | req->r_got_safe = true; | |
2222 | __unregister_request(mdsc, req); | |
2f2dc053 SW |
2223 | |
2224 | if (req->r_got_unsafe) { | |
2225 | /* | |
2226 | * We already handled the unsafe response, now do the | |
2227 | * cleanup. No need to examine the response; the MDS | |
2228 | * doesn't include any result info in the safe | |
2229 | * response. And even if it did, there is nothing | |
2230 | * useful we could do with a revised return value. | |
2231 | */ | |
2232 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2233 | list_del_init(&req->r_unsafe_item); | |
2234 | ||
2235 | /* last unsafe request during umount? */ | |
44ca18f2 | 2236 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2237 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2238 | mutex_unlock(&mdsc->mutex); |
2239 | goto out; | |
2240 | } | |
e1518c7c | 2241 | } else { |
2f2dc053 SW |
2242 | req->r_got_unsafe = true; |
2243 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
2244 | } | |
2245 | ||
2246 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2247 | rinfo = &req->r_reply_info; | |
14303d20 | 2248 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2249 | mutex_unlock(&mdsc->mutex); |
2250 | ||
2251 | mutex_lock(&session->s_mutex); | |
2252 | if (err < 0) { | |
25933abd | 2253 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2254 | ceph_msg_dump(msg); |
2f2dc053 SW |
2255 | goto out_err; |
2256 | } | |
2257 | ||
2258 | /* snap trace */ | |
2259 | if (rinfo->snapblob_len) { | |
2260 | down_write(&mdsc->snap_rwsem); | |
2261 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
2262 | rinfo->snapblob + rinfo->snapblob_len, | |
2263 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
2264 | downgrade_write(&mdsc->snap_rwsem); | |
2265 | } else { | |
2266 | down_read(&mdsc->snap_rwsem); | |
2267 | } | |
2268 | ||
2269 | /* insert trace into our cache */ | |
b4556396 | 2270 | mutex_lock(&req->r_fill_mutex); |
3d14c5d2 | 2271 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2272 | if (err == 0) { |
6e8575fa | 2273 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2274 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2275 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2276 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2277 | } |
b4556396 | 2278 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2279 | |
2280 | up_read(&mdsc->snap_rwsem); | |
2281 | out_err: | |
e1518c7c SW |
2282 | mutex_lock(&mdsc->mutex); |
2283 | if (!req->r_aborted) { | |
2284 | if (err) { | |
2285 | req->r_err = err; | |
2286 | } else { | |
2287 | req->r_reply = msg; | |
2288 | ceph_msg_get(msg); | |
2289 | req->r_got_result = true; | |
2290 | } | |
2f2dc053 | 2291 | } else { |
e1518c7c | 2292 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2293 | } |
e1518c7c | 2294 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2295 | |
ee6b272b | 2296 | ceph_add_cap_releases(mdsc, req->r_session); |
2f2dc053 SW |
2297 | mutex_unlock(&session->s_mutex); |
2298 | ||
2299 | /* kick calling process */ | |
2300 | complete_request(mdsc, req); | |
2301 | out: | |
2302 | ceph_mdsc_put_request(req); | |
2303 | return; | |
2304 | } | |
2305 | ||
2306 | ||
2307 | ||
2308 | /* | |
2309 | * handle mds notification that our request has been forwarded. | |
2310 | */ | |
2600d2dd SW |
2311 | static void handle_forward(struct ceph_mds_client *mdsc, |
2312 | struct ceph_mds_session *session, | |
2313 | struct ceph_msg *msg) | |
2f2dc053 SW |
2314 | { |
2315 | struct ceph_mds_request *req; | |
a1ea787c | 2316 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2317 | u32 next_mds; |
2318 | u32 fwd_seq; | |
2f2dc053 SW |
2319 | int err = -EINVAL; |
2320 | void *p = msg->front.iov_base; | |
2321 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2322 | |
a1ea787c | 2323 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2324 | next_mds = ceph_decode_32(&p); |
2325 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2326 | |
2327 | mutex_lock(&mdsc->mutex); | |
2328 | req = __lookup_request(mdsc, tid); | |
2329 | if (!req) { | |
2a8e5e36 | 2330 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2331 | goto out; /* dup reply? */ |
2332 | } | |
2333 | ||
2a8e5e36 SW |
2334 | if (req->r_aborted) { |
2335 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2336 | __unregister_request(mdsc, req); | |
2337 | } else if (fwd_seq <= req->r_num_fwd) { | |
2338 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2339 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2340 | } else { | |
2341 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2342 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2343 | BUG_ON(req->r_err); | |
2344 | BUG_ON(req->r_got_result); | |
2f2dc053 SW |
2345 | req->r_num_fwd = fwd_seq; |
2346 | req->r_resend_mds = next_mds; | |
2347 | put_request_session(req); | |
2348 | __do_request(mdsc, req); | |
2349 | } | |
2350 | ceph_mdsc_put_request(req); | |
2351 | out: | |
2352 | mutex_unlock(&mdsc->mutex); | |
2353 | return; | |
2354 | ||
2355 | bad: | |
2356 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2357 | } | |
2358 | ||
2359 | /* | |
2360 | * handle a mds session control message | |
2361 | */ | |
2362 | static void handle_session(struct ceph_mds_session *session, | |
2363 | struct ceph_msg *msg) | |
2364 | { | |
2365 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2366 | u32 op; | |
2367 | u64 seq; | |
2600d2dd | 2368 | int mds = session->s_mds; |
2f2dc053 SW |
2369 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2370 | int wake = 0; | |
2371 | ||
2f2dc053 SW |
2372 | /* decode */ |
2373 | if (msg->front.iov_len != sizeof(*h)) | |
2374 | goto bad; | |
2375 | op = le32_to_cpu(h->op); | |
2376 | seq = le64_to_cpu(h->seq); | |
2377 | ||
2378 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2379 | if (op == CEPH_SESSION_CLOSE) |
2380 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2381 | /* FIXME: this ttl calculation is generous */ |
2382 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2383 | mutex_unlock(&mdsc->mutex); | |
2384 | ||
2385 | mutex_lock(&session->s_mutex); | |
2386 | ||
2387 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2388 | mds, ceph_session_op_name(op), session, | |
2389 | session_state_name(session->s_state), seq); | |
2390 | ||
2391 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2392 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2393 | pr_info("mds%d came back\n", session->s_mds); | |
2394 | } | |
2395 | ||
2396 | switch (op) { | |
2397 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2398 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2399 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2400 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2401 | renewed_caps(mdsc, session, 0); | |
2402 | wake = 1; | |
2403 | if (mdsc->stopping) | |
2404 | __close_session(mdsc, session); | |
2405 | break; | |
2406 | ||
2407 | case CEPH_SESSION_RENEWCAPS: | |
2408 | if (session->s_renew_seq == seq) | |
2409 | renewed_caps(mdsc, session, 1); | |
2410 | break; | |
2411 | ||
2412 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2413 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2414 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 SW |
2415 | remove_session_caps(session); |
2416 | wake = 1; /* for good measure */ | |
f3c60c59 | 2417 | wake_up_all(&mdsc->session_close_wq); |
29790f26 | 2418 | kick_requests(mdsc, mds); |
2f2dc053 SW |
2419 | break; |
2420 | ||
2421 | case CEPH_SESSION_STALE: | |
2422 | pr_info("mds%d caps went stale, renewing\n", | |
2423 | session->s_mds); | |
d8fb02ab | 2424 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2425 | session->s_cap_gen++; |
1ce208a6 | 2426 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2427 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2428 | send_renew_caps(mdsc, session); |
2429 | break; | |
2430 | ||
2431 | case CEPH_SESSION_RECALL_STATE: | |
2432 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2433 | break; | |
2434 | ||
186e4f7a YZ |
2435 | case CEPH_SESSION_FLUSHMSG: |
2436 | send_flushmsg_ack(mdsc, session, seq); | |
2437 | break; | |
2438 | ||
2f2dc053 SW |
2439 | default: |
2440 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2441 | WARN_ON(1); | |
2442 | } | |
2443 | ||
2444 | mutex_unlock(&session->s_mutex); | |
2445 | if (wake) { | |
2446 | mutex_lock(&mdsc->mutex); | |
2447 | __wake_requests(mdsc, &session->s_waiting); | |
2448 | mutex_unlock(&mdsc->mutex); | |
2449 | } | |
2450 | return; | |
2451 | ||
2452 | bad: | |
2453 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2454 | (int)msg->front.iov_len); | |
9ec7cab1 | 2455 | ceph_msg_dump(msg); |
2f2dc053 SW |
2456 | return; |
2457 | } | |
2458 | ||
2459 | ||
2460 | /* | |
2461 | * called under session->mutex. | |
2462 | */ | |
2463 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2464 | struct ceph_mds_session *session) | |
2465 | { | |
2466 | struct ceph_mds_request *req, *nreq; | |
2467 | int err; | |
2468 | ||
2469 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2470 | ||
2471 | mutex_lock(&mdsc->mutex); | |
2472 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2473 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2474 | if (!err) { | |
2475 | ceph_msg_get(req->r_request); | |
2476 | ceph_con_send(&session->s_con, req->r_request); | |
2477 | } | |
2478 | } | |
2479 | mutex_unlock(&mdsc->mutex); | |
2480 | } | |
2481 | ||
2482 | /* | |
2483 | * Encode information about a cap for a reconnect with the MDS. | |
2484 | */ | |
2f2dc053 SW |
2485 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2486 | void *arg) | |
2487 | { | |
20cb34ae SW |
2488 | union { |
2489 | struct ceph_mds_cap_reconnect v2; | |
2490 | struct ceph_mds_cap_reconnect_v1 v1; | |
2491 | } rec; | |
2492 | size_t reclen; | |
2f2dc053 | 2493 | struct ceph_inode_info *ci; |
20cb34ae SW |
2494 | struct ceph_reconnect_state *recon_state = arg; |
2495 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2496 | char *path; |
2497 | int pathlen, err; | |
2498 | u64 pathbase; | |
2499 | struct dentry *dentry; | |
2500 | ||
2501 | ci = cap->ci; | |
2502 | ||
2503 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2504 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2505 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2506 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2507 | if (err) | |
2508 | return err; | |
2f2dc053 SW |
2509 | |
2510 | dentry = d_find_alias(inode); | |
2511 | if (dentry) { | |
2512 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2513 | if (IS_ERR(path)) { | |
2514 | err = PTR_ERR(path); | |
e072f8aa | 2515 | goto out_dput; |
2f2dc053 SW |
2516 | } |
2517 | } else { | |
2518 | path = NULL; | |
2519 | pathlen = 0; | |
2520 | } | |
93cea5be SW |
2521 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2522 | if (err) | |
e072f8aa | 2523 | goto out_free; |
2f2dc053 | 2524 | |
be655596 | 2525 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2526 | cap->seq = 0; /* reset cap seq */ |
2527 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2528 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2529 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae SW |
2530 | |
2531 | if (recon_state->flock) { | |
2532 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); | |
2533 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2534 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2535 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2536 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2537 | rec.v2.flock_len = 0; | |
2538 | reclen = sizeof(rec.v2); | |
2539 | } else { | |
2540 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2541 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2542 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2543 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2544 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2545 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2546 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2547 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
2548 | reclen = sizeof(rec.v1); | |
2549 | } | |
be655596 | 2550 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2551 | |
40819f6f GF |
2552 | if (recon_state->flock) { |
2553 | int num_fcntl_locks, num_flock_locks; | |
39be95e9 JS |
2554 | struct ceph_filelock *flocks; |
2555 | ||
2556 | encode_again: | |
1c8c601a | 2557 | spin_lock(&inode->i_lock); |
39be95e9 | 2558 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); |
1c8c601a | 2559 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2560 | flocks = kmalloc((num_fcntl_locks+num_flock_locks) * |
2561 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2562 | if (!flocks) { | |
2563 | err = -ENOMEM; | |
2564 | goto out_free; | |
2565 | } | |
1c8c601a | 2566 | spin_lock(&inode->i_lock); |
39be95e9 JS |
2567 | err = ceph_encode_locks_to_buffer(inode, flocks, |
2568 | num_fcntl_locks, | |
2569 | num_flock_locks); | |
1c8c601a | 2570 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2571 | if (err) { |
2572 | kfree(flocks); | |
2573 | if (err == -ENOSPC) | |
2574 | goto encode_again; | |
2575 | goto out_free; | |
2576 | } | |
2577 | /* | |
2578 | * number of encoded locks is stable, so copy to pagelist | |
2579 | */ | |
2580 | rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + | |
2581 | (num_fcntl_locks+num_flock_locks) * | |
2582 | sizeof(struct ceph_filelock)); | |
2583 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
2584 | if (!err) | |
2585 | err = ceph_locks_to_pagelist(flocks, pagelist, | |
2586 | num_fcntl_locks, | |
2587 | num_flock_locks); | |
2588 | kfree(flocks); | |
3612abbd SW |
2589 | } else { |
2590 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
40819f6f | 2591 | } |
44c99757 YZ |
2592 | |
2593 | recon_state->nr_caps++; | |
e072f8aa | 2594 | out_free: |
2f2dc053 | 2595 | kfree(path); |
e072f8aa | 2596 | out_dput: |
2f2dc053 | 2597 | dput(dentry); |
93cea5be | 2598 | return err; |
2f2dc053 SW |
2599 | } |
2600 | ||
2601 | ||
2602 | /* | |
2603 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2604 | * reestablish shared state. This includes all caps issued through | |
2605 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2606 | * clear which snap realms the mds cares about, we send everything we | |
2607 | * know about.. that ensures we'll then get any new info the | |
2608 | * recovering MDS might have. | |
2609 | * | |
2610 | * This is a relatively heavyweight operation, but it's rare. | |
2611 | * | |
2612 | * called with mdsc->mutex held. | |
2613 | */ | |
34b6c855 SW |
2614 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2615 | struct ceph_mds_session *session) | |
2f2dc053 | 2616 | { |
2f2dc053 | 2617 | struct ceph_msg *reply; |
a105f00c | 2618 | struct rb_node *p; |
34b6c855 | 2619 | int mds = session->s_mds; |
9abf82b8 | 2620 | int err = -ENOMEM; |
44c99757 | 2621 | int s_nr_caps; |
93cea5be | 2622 | struct ceph_pagelist *pagelist; |
20cb34ae | 2623 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2624 | |
34b6c855 | 2625 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2626 | |
93cea5be SW |
2627 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2628 | if (!pagelist) | |
2629 | goto fail_nopagelist; | |
2630 | ceph_pagelist_init(pagelist); | |
2631 | ||
b61c2763 | 2632 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 2633 | if (!reply) |
93cea5be | 2634 | goto fail_nomsg; |
93cea5be | 2635 | |
34b6c855 SW |
2636 | mutex_lock(&session->s_mutex); |
2637 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2638 | session->s_seq = 0; | |
2f2dc053 | 2639 | |
a53aab64 | 2640 | ceph_con_close(&session->s_con); |
34b6c855 | 2641 | ceph_con_open(&session->s_con, |
b7a9e5dd | 2642 | CEPH_ENTITY_TYPE_MDS, mds, |
34b6c855 | 2643 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); |
2f2dc053 | 2644 | |
34b6c855 SW |
2645 | /* replay unsafe requests */ |
2646 | replay_unsafe_requests(mdsc, session); | |
2f2dc053 SW |
2647 | |
2648 | down_read(&mdsc->snap_rwsem); | |
2649 | ||
2f2dc053 SW |
2650 | dout("session %p state %s\n", session, |
2651 | session_state_name(session->s_state)); | |
2652 | ||
99a9c273 YZ |
2653 | spin_lock(&session->s_gen_ttl_lock); |
2654 | session->s_cap_gen++; | |
2655 | spin_unlock(&session->s_gen_ttl_lock); | |
2656 | ||
2657 | spin_lock(&session->s_cap_lock); | |
2658 | /* | |
2659 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
2660 | * If a cap get released before being added to the cap reconnect, | |
2661 | * __ceph_remove_cap() should skip queuing cap release. | |
2662 | */ | |
2663 | session->s_cap_reconnect = 1; | |
e01a5946 SW |
2664 | /* drop old cap expires; we're about to reestablish that state */ |
2665 | discard_cap_releases(mdsc, session); | |
99a9c273 | 2666 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 2667 | |
2f2dc053 | 2668 | /* traverse this session's caps */ |
44c99757 YZ |
2669 | s_nr_caps = session->s_nr_caps; |
2670 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
2671 | if (err) |
2672 | goto fail; | |
20cb34ae | 2673 | |
44c99757 | 2674 | recon_state.nr_caps = 0; |
20cb34ae SW |
2675 | recon_state.pagelist = pagelist; |
2676 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; | |
2677 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); | |
2f2dc053 | 2678 | if (err < 0) |
9abf82b8 | 2679 | goto fail; |
2f2dc053 | 2680 | |
99a9c273 YZ |
2681 | spin_lock(&session->s_cap_lock); |
2682 | session->s_cap_reconnect = 0; | |
2683 | spin_unlock(&session->s_cap_lock); | |
2684 | ||
2f2dc053 SW |
2685 | /* |
2686 | * snaprealms. we provide mds with the ino, seq (version), and | |
2687 | * parent for all of our realms. If the mds has any newer info, | |
2688 | * it will tell us. | |
2689 | */ | |
a105f00c SW |
2690 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2691 | struct ceph_snap_realm *realm = | |
2692 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2693 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2694 | |
2695 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2696 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2697 | sr_rec.ino = cpu_to_le64(realm->ino); |
2698 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2699 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2700 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2701 | if (err) | |
2702 | goto fail; | |
2f2dc053 | 2703 | } |
2f2dc053 | 2704 | |
20cb34ae SW |
2705 | if (recon_state.flock) |
2706 | reply->hdr.version = cpu_to_le16(2); | |
44c99757 YZ |
2707 | |
2708 | /* raced with cap release? */ | |
2709 | if (s_nr_caps != recon_state.nr_caps) { | |
2710 | struct page *page = list_first_entry(&pagelist->head, | |
2711 | struct page, lru); | |
2712 | __le32 *addr = kmap_atomic(page); | |
2713 | *addr = cpu_to_le32(recon_state.nr_caps); | |
2714 | kunmap_atomic(addr); | |
ebf18f47 | 2715 | } |
44c99757 YZ |
2716 | |
2717 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
2718 | ceph_msg_data_add_pagelist(reply, pagelist); | |
2f2dc053 SW |
2719 | ceph_con_send(&session->s_con, reply); |
2720 | ||
9abf82b8 SW |
2721 | mutex_unlock(&session->s_mutex); |
2722 | ||
2723 | mutex_lock(&mdsc->mutex); | |
2724 | __wake_requests(mdsc, &session->s_waiting); | |
2725 | mutex_unlock(&mdsc->mutex); | |
2726 | ||
2f2dc053 | 2727 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2728 | return; |
2729 | ||
93cea5be | 2730 | fail: |
2f2dc053 | 2731 | ceph_msg_put(reply); |
9abf82b8 SW |
2732 | up_read(&mdsc->snap_rwsem); |
2733 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
2734 | fail_nomsg: |
2735 | ceph_pagelist_release(pagelist); | |
2736 | kfree(pagelist); | |
2737 | fail_nopagelist: | |
9abf82b8 | 2738 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 2739 | return; |
2f2dc053 SW |
2740 | } |
2741 | ||
2742 | ||
2743 | /* | |
2744 | * compare old and new mdsmaps, kicking requests | |
2745 | * and closing out old connections as necessary | |
2746 | * | |
2747 | * called under mdsc->mutex. | |
2748 | */ | |
2749 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2750 | struct ceph_mdsmap *newmap, | |
2751 | struct ceph_mdsmap *oldmap) | |
2752 | { | |
2753 | int i; | |
2754 | int oldstate, newstate; | |
2755 | struct ceph_mds_session *s; | |
2756 | ||
2757 | dout("check_new_map new %u old %u\n", | |
2758 | newmap->m_epoch, oldmap->m_epoch); | |
2759 | ||
2760 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2761 | if (mdsc->sessions[i] == NULL) | |
2762 | continue; | |
2763 | s = mdsc->sessions[i]; | |
2764 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2765 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2766 | ||
0deb01c9 | 2767 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 2768 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 2769 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 2770 | ceph_mds_state_name(newstate), |
0deb01c9 | 2771 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
2f2dc053 SW |
2772 | session_state_name(s->s_state)); |
2773 | ||
3e8f43a0 YZ |
2774 | if (i >= newmap->m_max_mds || |
2775 | memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2f2dc053 SW |
2776 | ceph_mdsmap_get_addr(newmap, i), |
2777 | sizeof(struct ceph_entity_addr))) { | |
2778 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2779 | /* the session never opened, just close it | |
2780 | * out now */ | |
2781 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2782 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2783 | } else { |
2784 | /* just close it */ | |
2785 | mutex_unlock(&mdsc->mutex); | |
2786 | mutex_lock(&s->s_mutex); | |
2787 | mutex_lock(&mdsc->mutex); | |
2788 | ceph_con_close(&s->s_con); | |
2789 | mutex_unlock(&s->s_mutex); | |
2790 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2791 | } | |
2792 | ||
2793 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2794 | kick_requests(mdsc, i); |
2f2dc053 SW |
2795 | } else if (oldstate == newstate) { |
2796 | continue; /* nothing new with this mds */ | |
2797 | } | |
2798 | ||
2799 | /* | |
2800 | * send reconnect? | |
2801 | */ | |
2802 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
2803 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
2804 | mutex_unlock(&mdsc->mutex); | |
2805 | send_mds_reconnect(mdsc, s); | |
2806 | mutex_lock(&mdsc->mutex); | |
2807 | } | |
2f2dc053 SW |
2808 | |
2809 | /* | |
29790f26 | 2810 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2811 | */ |
2812 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2813 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2814 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2815 | oldstate != CEPH_MDS_STATE_STARTING) | |
2816 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2817 | kick_requests(mdsc, i); | |
2f2dc053 | 2818 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2819 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2820 | } |
2821 | } | |
cb170a22 SW |
2822 | |
2823 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2824 | s = mdsc->sessions[i]; | |
2825 | if (!s) | |
2826 | continue; | |
2827 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
2828 | continue; | |
2829 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
2830 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
2831 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2832 | dout(" connecting to export targets of laggy mds%d\n", | |
2833 | i); | |
2834 | __open_export_target_sessions(mdsc, s); | |
2835 | } | |
2836 | } | |
2f2dc053 SW |
2837 | } |
2838 | ||
2839 | ||
2840 | ||
2841 | /* | |
2842 | * leases | |
2843 | */ | |
2844 | ||
2845 | /* | |
2846 | * caller must hold session s_mutex, dentry->d_lock | |
2847 | */ | |
2848 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2849 | { | |
2850 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2851 | ||
2852 | ceph_put_mds_session(di->lease_session); | |
2853 | di->lease_session = NULL; | |
2854 | } | |
2855 | ||
2600d2dd SW |
2856 | static void handle_lease(struct ceph_mds_client *mdsc, |
2857 | struct ceph_mds_session *session, | |
2858 | struct ceph_msg *msg) | |
2f2dc053 | 2859 | { |
3d14c5d2 | 2860 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 2861 | struct inode *inode; |
2f2dc053 SW |
2862 | struct dentry *parent, *dentry; |
2863 | struct ceph_dentry_info *di; | |
2600d2dd | 2864 | int mds = session->s_mds; |
2f2dc053 | 2865 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 2866 | u32 seq; |
2f2dc053 | 2867 | struct ceph_vino vino; |
2f2dc053 SW |
2868 | struct qstr dname; |
2869 | int release = 0; | |
2870 | ||
2f2dc053 SW |
2871 | dout("handle_lease from mds%d\n", mds); |
2872 | ||
2873 | /* decode */ | |
2874 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
2875 | goto bad; | |
2876 | vino.ino = le64_to_cpu(h->ino); | |
2877 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 2878 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
2879 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
2880 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
2881 | if (dname.len != get_unaligned_le32(h+1)) | |
2882 | goto bad; | |
2883 | ||
2f2dc053 SW |
2884 | mutex_lock(&session->s_mutex); |
2885 | session->s_seq++; | |
2886 | ||
2887 | /* lookup inode */ | |
2888 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
2889 | dout("handle_lease %s, ino %llx %p %.*s\n", |
2890 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 2891 | dname.len, dname.name); |
2f2dc053 SW |
2892 | if (inode == NULL) { |
2893 | dout("handle_lease no inode %llx\n", vino.ino); | |
2894 | goto release; | |
2895 | } | |
2f2dc053 SW |
2896 | |
2897 | /* dentry */ | |
2898 | parent = d_find_alias(inode); | |
2899 | if (!parent) { | |
2900 | dout("no parent dentry on inode %p\n", inode); | |
2901 | WARN_ON(1); | |
2902 | goto release; /* hrm... */ | |
2903 | } | |
2904 | dname.hash = full_name_hash(dname.name, dname.len); | |
2905 | dentry = d_lookup(parent, &dname); | |
2906 | dput(parent); | |
2907 | if (!dentry) | |
2908 | goto release; | |
2909 | ||
2910 | spin_lock(&dentry->d_lock); | |
2911 | di = ceph_dentry(dentry); | |
2912 | switch (h->action) { | |
2913 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 2914 | if (di->lease_session == session) { |
1e5ea23d SW |
2915 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
2916 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
2917 | __ceph_mdsc_drop_dentry_lease(dentry); |
2918 | } | |
2919 | release = 1; | |
2920 | break; | |
2921 | ||
2922 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 2923 | if (di->lease_session == session && |
2f2dc053 SW |
2924 | di->lease_gen == session->s_cap_gen && |
2925 | di->lease_renew_from && | |
2926 | di->lease_renew_after == 0) { | |
2927 | unsigned long duration = | |
2928 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
2929 | ||
1e5ea23d | 2930 | di->lease_seq = seq; |
2f2dc053 SW |
2931 | dentry->d_time = di->lease_renew_from + duration; |
2932 | di->lease_renew_after = di->lease_renew_from + | |
2933 | (duration >> 1); | |
2934 | di->lease_renew_from = 0; | |
2935 | } | |
2936 | break; | |
2937 | } | |
2938 | spin_unlock(&dentry->d_lock); | |
2939 | dput(dentry); | |
2940 | ||
2941 | if (!release) | |
2942 | goto out; | |
2943 | ||
2944 | release: | |
2945 | /* let's just reuse the same message */ | |
2946 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
2947 | ceph_msg_get(msg); | |
2948 | ceph_con_send(&session->s_con, msg); | |
2949 | ||
2950 | out: | |
2951 | iput(inode); | |
2952 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
2953 | return; |
2954 | ||
2955 | bad: | |
2956 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 2957 | ceph_msg_dump(msg); |
2f2dc053 SW |
2958 | } |
2959 | ||
2960 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
2961 | struct inode *inode, | |
2962 | struct dentry *dentry, char action, | |
2963 | u32 seq) | |
2964 | { | |
2965 | struct ceph_msg *msg; | |
2966 | struct ceph_mds_lease *lease; | |
2967 | int len = sizeof(*lease) + sizeof(u32); | |
2968 | int dnamelen = 0; | |
2969 | ||
2970 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
2971 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
2972 | dnamelen = dentry->d_name.len; | |
2973 | len += dnamelen; | |
2974 | ||
b61c2763 | 2975 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 2976 | if (!msg) |
2f2dc053 SW |
2977 | return; |
2978 | lease = msg->front.iov_base; | |
2979 | lease->action = action; | |
2f2dc053 SW |
2980 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
2981 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
2982 | lease->seq = cpu_to_le32(seq); | |
2983 | put_unaligned_le32(dnamelen, lease + 1); | |
2984 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
2985 | ||
2986 | /* | |
2987 | * if this is a preemptive lease RELEASE, no need to | |
2988 | * flush request stream, since the actual request will | |
2989 | * soon follow. | |
2990 | */ | |
2991 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
2992 | ||
2993 | ceph_con_send(&session->s_con, msg); | |
2994 | } | |
2995 | ||
2996 | /* | |
2997 | * Preemptively release a lease we expect to invalidate anyway. | |
2998 | * Pass @inode always, @dentry is optional. | |
2999 | */ | |
3000 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2f90b852 | 3001 | struct dentry *dentry) |
2f2dc053 SW |
3002 | { |
3003 | struct ceph_dentry_info *di; | |
3004 | struct ceph_mds_session *session; | |
3005 | u32 seq; | |
3006 | ||
3007 | BUG_ON(inode == NULL); | |
3008 | BUG_ON(dentry == NULL); | |
2f2dc053 SW |
3009 | |
3010 | /* is dentry lease valid? */ | |
3011 | spin_lock(&dentry->d_lock); | |
3012 | di = ceph_dentry(dentry); | |
3013 | if (!di || !di->lease_session || | |
3014 | di->lease_session->s_mds < 0 || | |
3015 | di->lease_gen != di->lease_session->s_cap_gen || | |
3016 | !time_before(jiffies, dentry->d_time)) { | |
3017 | dout("lease_release inode %p dentry %p -- " | |
2f90b852 SW |
3018 | "no lease\n", |
3019 | inode, dentry); | |
2f2dc053 SW |
3020 | spin_unlock(&dentry->d_lock); |
3021 | return; | |
3022 | } | |
3023 | ||
3024 | /* we do have a lease on this dentry; note mds and seq */ | |
3025 | session = ceph_get_mds_session(di->lease_session); | |
3026 | seq = di->lease_seq; | |
3027 | __ceph_mdsc_drop_dentry_lease(dentry); | |
3028 | spin_unlock(&dentry->d_lock); | |
3029 | ||
2f90b852 SW |
3030 | dout("lease_release inode %p dentry %p to mds%d\n", |
3031 | inode, dentry, session->s_mds); | |
2f2dc053 SW |
3032 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
3033 | CEPH_MDS_LEASE_RELEASE, seq); | |
3034 | ceph_put_mds_session(session); | |
3035 | } | |
3036 | ||
3037 | /* | |
3038 | * drop all leases (and dentry refs) in preparation for umount | |
3039 | */ | |
3040 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3041 | { | |
3042 | int i; | |
3043 | ||
3044 | dout("drop_leases\n"); | |
3045 | mutex_lock(&mdsc->mutex); | |
3046 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3047 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3048 | if (!s) | |
3049 | continue; | |
3050 | mutex_unlock(&mdsc->mutex); | |
3051 | mutex_lock(&s->s_mutex); | |
3052 | mutex_unlock(&s->s_mutex); | |
3053 | ceph_put_mds_session(s); | |
3054 | mutex_lock(&mdsc->mutex); | |
3055 | } | |
3056 | mutex_unlock(&mdsc->mutex); | |
3057 | } | |
3058 | ||
3059 | ||
3060 | ||
3061 | /* | |
3062 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3063 | */ | |
3064 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3065 | { | |
3066 | int delay = 5; | |
3067 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3068 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3069 | } | |
3070 | ||
3071 | static void delayed_work(struct work_struct *work) | |
3072 | { | |
3073 | int i; | |
3074 | struct ceph_mds_client *mdsc = | |
3075 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3076 | int renew_interval; | |
3077 | int renew_caps; | |
3078 | ||
3079 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3080 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3081 | |
3082 | mutex_lock(&mdsc->mutex); | |
3083 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3084 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3085 | mdsc->last_renew_caps); | |
3086 | if (renew_caps) | |
3087 | mdsc->last_renew_caps = jiffies; | |
3088 | ||
3089 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3090 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3091 | if (s == NULL) | |
3092 | continue; | |
3093 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3094 | dout("resending session close request for mds%d\n", | |
3095 | s->s_mds); | |
3096 | request_close_session(mdsc, s); | |
3097 | ceph_put_mds_session(s); | |
3098 | continue; | |
3099 | } | |
3100 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3101 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3102 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3103 | pr_info("mds%d hung\n", s->s_mds); | |
3104 | } | |
3105 | } | |
3106 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3107 | /* this mds is failed or recovering, just wait */ | |
3108 | ceph_put_mds_session(s); | |
3109 | continue; | |
3110 | } | |
3111 | mutex_unlock(&mdsc->mutex); | |
3112 | ||
3113 | mutex_lock(&s->s_mutex); | |
3114 | if (renew_caps) | |
3115 | send_renew_caps(mdsc, s); | |
3116 | else | |
3117 | ceph_con_keepalive(&s->s_con); | |
ee6b272b | 3118 | ceph_add_cap_releases(mdsc, s); |
aab53dd9 SW |
3119 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3120 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3121 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3122 | mutex_unlock(&s->s_mutex); |
3123 | ceph_put_mds_session(s); | |
3124 | ||
3125 | mutex_lock(&mdsc->mutex); | |
3126 | } | |
3127 | mutex_unlock(&mdsc->mutex); | |
3128 | ||
3129 | schedule_delayed(mdsc); | |
3130 | } | |
3131 | ||
3d14c5d2 | 3132 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3133 | |
2f2dc053 | 3134 | { |
3d14c5d2 YS |
3135 | struct ceph_mds_client *mdsc; |
3136 | ||
3137 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3138 | if (!mdsc) | |
3139 | return -ENOMEM; | |
3140 | mdsc->fsc = fsc; | |
3141 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3142 | mutex_init(&mdsc->mutex); |
3143 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
fb3101b6 | 3144 | if (mdsc->mdsmap == NULL) { |
3145 | kfree(mdsc); | |
2d06eeb8 | 3146 | return -ENOMEM; |
fb3101b6 | 3147 | } |
2d06eeb8 | 3148 | |
2f2dc053 | 3149 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3150 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3151 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3152 | mdsc->sessions = NULL; | |
3153 | mdsc->max_sessions = 0; | |
3154 | mdsc->stopping = 0; | |
3155 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 3156 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3157 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3158 | spin_lock_init(&mdsc->snap_empty_lock); | |
3159 | mdsc->last_tid = 0; | |
44ca18f2 | 3160 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3161 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3162 | mdsc->last_renew_caps = jiffies; | |
3163 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3164 | spin_lock_init(&mdsc->cap_delay_lock); | |
3165 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3166 | spin_lock_init(&mdsc->snap_flush_lock); | |
3167 | mdsc->cap_flush_seq = 0; | |
3168 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
db354052 | 3169 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3170 | mdsc->num_cap_flushing = 0; |
3171 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3172 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3173 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3174 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3175 | |
37151668 | 3176 | ceph_caps_init(mdsc); |
3d14c5d2 | 3177 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3178 | |
5f44f142 | 3179 | return 0; |
2f2dc053 SW |
3180 | } |
3181 | ||
3182 | /* | |
3183 | * Wait for safe replies on open mds requests. If we time out, drop | |
3184 | * all requests from the tree to avoid dangling dentry refs. | |
3185 | */ | |
3186 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3187 | { | |
3188 | struct ceph_mds_request *req; | |
3d14c5d2 | 3189 | struct ceph_fs_client *fsc = mdsc->fsc; |
2f2dc053 SW |
3190 | |
3191 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3192 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3193 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3194 | |
2f2dc053 SW |
3195 | dout("wait_requests waiting for requests\n"); |
3196 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
3d14c5d2 | 3197 | fsc->client->options->mount_timeout * HZ); |
2f2dc053 SW |
3198 | |
3199 | /* tear down remaining requests */ | |
44ca18f2 SW |
3200 | mutex_lock(&mdsc->mutex); |
3201 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3202 | dout("wait_requests timed out on tid %llu\n", |
3203 | req->r_tid); | |
44ca18f2 | 3204 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3205 | } |
3206 | } | |
3207 | mutex_unlock(&mdsc->mutex); | |
3208 | dout("wait_requests done\n"); | |
3209 | } | |
3210 | ||
3211 | /* | |
3212 | * called before mount is ro, and before dentries are torn down. | |
3213 | * (hmm, does this still race with new lookups?) | |
3214 | */ | |
3215 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3216 | { | |
3217 | dout("pre_umount\n"); | |
3218 | mdsc->stopping = 1; | |
3219 | ||
3220 | drop_leases(mdsc); | |
afcdaea3 | 3221 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3222 | wait_requests(mdsc); |
17c688c3 SW |
3223 | |
3224 | /* | |
3225 | * wait for reply handlers to drop their request refs and | |
3226 | * their inode/dcache refs | |
3227 | */ | |
3228 | ceph_msgr_flush(); | |
2f2dc053 SW |
3229 | } |
3230 | ||
3231 | /* | |
3232 | * wait for all write mds requests to flush. | |
3233 | */ | |
3234 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3235 | { | |
80fc7314 | 3236 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3237 | struct rb_node *n; |
2f2dc053 SW |
3238 | |
3239 | mutex_lock(&mdsc->mutex); | |
3240 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3241 | restart: |
44ca18f2 SW |
3242 | req = __get_oldest_req(mdsc); |
3243 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3244 | /* find next request */ |
3245 | n = rb_next(&req->r_node); | |
3246 | if (n) | |
3247 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3248 | else | |
3249 | nextreq = NULL; | |
44ca18f2 SW |
3250 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
3251 | /* write op */ | |
3252 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3253 | if (nextreq) |
3254 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3255 | mutex_unlock(&mdsc->mutex); |
3256 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3257 | req->r_tid, want_tid); | |
3258 | wait_for_completion(&req->r_safe_completion); | |
3259 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3260 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3261 | if (!nextreq) |
3262 | break; /* next dne before, so we're done! */ | |
3263 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3264 | /* next request was removed from tree */ | |
3265 | ceph_mdsc_put_request(nextreq); | |
3266 | goto restart; | |
3267 | } | |
3268 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3269 | } |
80fc7314 | 3270 | req = nextreq; |
2f2dc053 SW |
3271 | } |
3272 | mutex_unlock(&mdsc->mutex); | |
3273 | dout("wait_unsafe_requests done\n"); | |
3274 | } | |
3275 | ||
3276 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3277 | { | |
3278 | u64 want_tid, want_flush; | |
3279 | ||
3d14c5d2 | 3280 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3281 | return; |
3282 | ||
2f2dc053 SW |
3283 | dout("sync\n"); |
3284 | mutex_lock(&mdsc->mutex); | |
3285 | want_tid = mdsc->last_tid; | |
3286 | want_flush = mdsc->cap_flush_seq; | |
3287 | mutex_unlock(&mdsc->mutex); | |
3288 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
3289 | ||
afcdaea3 | 3290 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
3291 | |
3292 | wait_unsafe_requests(mdsc, want_tid); | |
3293 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
3294 | } | |
3295 | ||
f3c60c59 SW |
3296 | /* |
3297 | * true if all sessions are closed, or we force unmount | |
3298 | */ | |
7fd7d101 | 3299 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
f3c60c59 SW |
3300 | { |
3301 | int i, n = 0; | |
3302 | ||
3d14c5d2 | 3303 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 SW |
3304 | return true; |
3305 | ||
3306 | mutex_lock(&mdsc->mutex); | |
3307 | for (i = 0; i < mdsc->max_sessions; i++) | |
3308 | if (mdsc->sessions[i]) | |
3309 | n++; | |
3310 | mutex_unlock(&mdsc->mutex); | |
3311 | return n == 0; | |
3312 | } | |
2f2dc053 SW |
3313 | |
3314 | /* | |
3315 | * called after sb is ro. | |
3316 | */ | |
3317 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3318 | { | |
3319 | struct ceph_mds_session *session; | |
3320 | int i; | |
3d14c5d2 YS |
3321 | struct ceph_fs_client *fsc = mdsc->fsc; |
3322 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; | |
2f2dc053 SW |
3323 | |
3324 | dout("close_sessions\n"); | |
3325 | ||
2f2dc053 | 3326 | /* close sessions */ |
f3c60c59 SW |
3327 | mutex_lock(&mdsc->mutex); |
3328 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3329 | session = __ceph_lookup_mds_session(mdsc, i); | |
3330 | if (!session) | |
3331 | continue; | |
2f2dc053 | 3332 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3333 | mutex_lock(&session->s_mutex); |
3334 | __close_session(mdsc, session); | |
3335 | mutex_unlock(&session->s_mutex); | |
3336 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3337 | mutex_lock(&mdsc->mutex); |
3338 | } | |
f3c60c59 SW |
3339 | mutex_unlock(&mdsc->mutex); |
3340 | ||
3341 | dout("waiting for sessions to close\n"); | |
3342 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
3343 | timeout); | |
2f2dc053 SW |
3344 | |
3345 | /* tear down remaining sessions */ | |
f3c60c59 | 3346 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3347 | for (i = 0; i < mdsc->max_sessions; i++) { |
3348 | if (mdsc->sessions[i]) { | |
3349 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3350 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3351 | mutex_unlock(&mdsc->mutex); |
3352 | mutex_lock(&session->s_mutex); | |
3353 | remove_session_caps(session); | |
3354 | mutex_unlock(&session->s_mutex); | |
3355 | ceph_put_mds_session(session); | |
3356 | mutex_lock(&mdsc->mutex); | |
3357 | } | |
3358 | } | |
2f2dc053 | 3359 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3360 | mutex_unlock(&mdsc->mutex); |
3361 | ||
3362 | ceph_cleanup_empty_realms(mdsc); | |
3363 | ||
3364 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3365 | ||
3366 | dout("stopped\n"); | |
3367 | } | |
3368 | ||
3d14c5d2 | 3369 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3370 | { |
3371 | dout("stop\n"); | |
3372 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3373 | if (mdsc->mdsmap) | |
3374 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3375 | kfree(mdsc->sessions); | |
37151668 | 3376 | ceph_caps_finalize(mdsc); |
2f2dc053 SW |
3377 | } |
3378 | ||
3d14c5d2 YS |
3379 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3380 | { | |
3381 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3382 | ||
ef550f6f | 3383 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3384 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3385 | |
3386 | /* flush out any connection work with references to us */ | |
3387 | ceph_msgr_flush(); | |
3388 | ||
3d14c5d2 YS |
3389 | fsc->mdsc = NULL; |
3390 | kfree(mdsc); | |
ef550f6f | 3391 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3392 | } |
3393 | ||
2f2dc053 SW |
3394 | |
3395 | /* | |
3396 | * handle mds map update. | |
3397 | */ | |
3398 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
3399 | { | |
3400 | u32 epoch; | |
3401 | u32 maplen; | |
3402 | void *p = msg->front.iov_base; | |
3403 | void *end = p + msg->front.iov_len; | |
3404 | struct ceph_mdsmap *newmap, *oldmap; | |
3405 | struct ceph_fsid fsid; | |
3406 | int err = -EINVAL; | |
3407 | ||
3408 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3409 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3410 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3411 | return; |
c89136ea SW |
3412 | epoch = ceph_decode_32(&p); |
3413 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3414 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3415 | ||
3416 | /* do we need it? */ | |
3d14c5d2 | 3417 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
2f2dc053 SW |
3418 | mutex_lock(&mdsc->mutex); |
3419 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3420 | dout("handle_map epoch %u <= our %u\n", | |
3421 | epoch, mdsc->mdsmap->m_epoch); | |
3422 | mutex_unlock(&mdsc->mutex); | |
3423 | return; | |
3424 | } | |
3425 | ||
3426 | newmap = ceph_mdsmap_decode(&p, end); | |
3427 | if (IS_ERR(newmap)) { | |
3428 | err = PTR_ERR(newmap); | |
3429 | goto bad_unlock; | |
3430 | } | |
3431 | ||
3432 | /* swap into place */ | |
3433 | if (mdsc->mdsmap) { | |
3434 | oldmap = mdsc->mdsmap; | |
3435 | mdsc->mdsmap = newmap; | |
3436 | check_new_map(mdsc, newmap, oldmap); | |
3437 | ceph_mdsmap_destroy(oldmap); | |
3438 | } else { | |
3439 | mdsc->mdsmap = newmap; /* first mds map */ | |
3440 | } | |
3d14c5d2 | 3441 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3442 | |
3443 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3444 | ||
3445 | mutex_unlock(&mdsc->mutex); | |
3446 | schedule_delayed(mdsc); | |
3447 | return; | |
3448 | ||
3449 | bad_unlock: | |
3450 | mutex_unlock(&mdsc->mutex); | |
3451 | bad: | |
3452 | pr_err("error decoding mdsmap %d\n", err); | |
3453 | return; | |
3454 | } | |
3455 | ||
3456 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3457 | { | |
3458 | struct ceph_mds_session *s = con->private; | |
3459 | ||
3460 | if (get_session(s)) { | |
2600d2dd | 3461 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3462 | return con; |
3463 | } | |
3464 | dout("mdsc con_get %p FAIL\n", s); | |
3465 | return NULL; | |
3466 | } | |
3467 | ||
3468 | static void con_put(struct ceph_connection *con) | |
3469 | { | |
3470 | struct ceph_mds_session *s = con->private; | |
3471 | ||
7d8e18a6 | 3472 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3473 | ceph_put_mds_session(s); |
3474 | } | |
3475 | ||
3476 | /* | |
3477 | * if the client is unresponsive for long enough, the mds will kill | |
3478 | * the session entirely. | |
3479 | */ | |
3480 | static void peer_reset(struct ceph_connection *con) | |
3481 | { | |
3482 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3483 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3484 | |
7e70f0ed SW |
3485 | pr_warning("mds%d closed our session\n", s->s_mds); |
3486 | send_mds_reconnect(mdsc, s); | |
2f2dc053 SW |
3487 | } |
3488 | ||
3489 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3490 | { | |
3491 | struct ceph_mds_session *s = con->private; | |
3492 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3493 | int type = le16_to_cpu(msg->hdr.type); | |
3494 | ||
2600d2dd SW |
3495 | mutex_lock(&mdsc->mutex); |
3496 | if (__verify_registered_session(mdsc, s) < 0) { | |
3497 | mutex_unlock(&mdsc->mutex); | |
3498 | goto out; | |
3499 | } | |
3500 | mutex_unlock(&mdsc->mutex); | |
3501 | ||
2f2dc053 SW |
3502 | switch (type) { |
3503 | case CEPH_MSG_MDS_MAP: | |
3504 | ceph_mdsc_handle_map(mdsc, msg); | |
3505 | break; | |
3506 | case CEPH_MSG_CLIENT_SESSION: | |
3507 | handle_session(s, msg); | |
3508 | break; | |
3509 | case CEPH_MSG_CLIENT_REPLY: | |
3510 | handle_reply(s, msg); | |
3511 | break; | |
3512 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3513 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3514 | break; |
3515 | case CEPH_MSG_CLIENT_CAPS: | |
3516 | ceph_handle_caps(s, msg); | |
3517 | break; | |
3518 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3519 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3520 | break; |
3521 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3522 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3523 | break; |
3524 | ||
3525 | default: | |
3526 | pr_err("received unknown message type %d %s\n", type, | |
3527 | ceph_msg_type_name(type)); | |
3528 | } | |
2600d2dd | 3529 | out: |
2f2dc053 SW |
3530 | ceph_msg_put(msg); |
3531 | } | |
3532 | ||
4e7a5dcd SW |
3533 | /* |
3534 | * authentication | |
3535 | */ | |
a3530df3 AE |
3536 | |
3537 | /* | |
3538 | * Note: returned pointer is the address of a structure that's | |
3539 | * managed separately. Caller must *not* attempt to free it. | |
3540 | */ | |
3541 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 3542 | int *proto, int force_new) |
4e7a5dcd SW |
3543 | { |
3544 | struct ceph_mds_session *s = con->private; | |
3545 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3546 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 3547 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 3548 | |
74f1869f | 3549 | if (force_new && auth->authorizer) { |
27859f97 | 3550 | ceph_auth_destroy_authorizer(ac, auth->authorizer); |
74f1869f | 3551 | auth->authorizer = NULL; |
4e7a5dcd | 3552 | } |
27859f97 SW |
3553 | if (!auth->authorizer) { |
3554 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3555 | auth); | |
0bed9b5c SW |
3556 | if (ret) |
3557 | return ERR_PTR(ret); | |
27859f97 SW |
3558 | } else { |
3559 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3560 | auth); | |
a255651d | 3561 | if (ret) |
a3530df3 | 3562 | return ERR_PTR(ret); |
4e7a5dcd | 3563 | } |
4e7a5dcd | 3564 | *proto = ac->protocol; |
74f1869f | 3565 | |
a3530df3 | 3566 | return auth; |
4e7a5dcd SW |
3567 | } |
3568 | ||
3569 | ||
3570 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3571 | { | |
3572 | struct ceph_mds_session *s = con->private; | |
3573 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3574 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 3575 | |
27859f97 | 3576 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); |
4e7a5dcd SW |
3577 | } |
3578 | ||
9bd2e6f8 SW |
3579 | static int invalidate_authorizer(struct ceph_connection *con) |
3580 | { | |
3581 | struct ceph_mds_session *s = con->private; | |
3582 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3583 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 3584 | |
27859f97 | 3585 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 3586 | |
3d14c5d2 | 3587 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3588 | } |
3589 | ||
53ded495 AE |
3590 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
3591 | struct ceph_msg_header *hdr, int *skip) | |
3592 | { | |
3593 | struct ceph_msg *msg; | |
3594 | int type = (int) le16_to_cpu(hdr->type); | |
3595 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
3596 | ||
3597 | if (con->in_msg) | |
3598 | return con->in_msg; | |
3599 | ||
3600 | *skip = 0; | |
3601 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
3602 | if (!msg) { | |
3603 | pr_err("unable to allocate msg type %d len %d\n", | |
3604 | type, front_len); | |
3605 | return NULL; | |
3606 | } | |
53ded495 AE |
3607 | |
3608 | return msg; | |
3609 | } | |
3610 | ||
9e32789f | 3611 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3612 | .get = con_get, |
3613 | .put = con_put, | |
3614 | .dispatch = dispatch, | |
4e7a5dcd SW |
3615 | .get_authorizer = get_authorizer, |
3616 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3617 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3618 | .peer_reset = peer_reset, |
53ded495 | 3619 | .alloc_msg = mds_alloc_msg, |
2f2dc053 SW |
3620 | }; |
3621 | ||
2f2dc053 | 3622 | /* eof */ |