Commit | Line | Data |
---|---|---|
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> |
54008399 | 6 | #include <linux/gfp.h> |
2f2dc053 | 7 | #include <linux/sched.h> |
3d14c5d2 YS |
8 | #include <linux/debugfs.h> |
9 | #include <linux/seq_file.h> | |
2f2dc053 | 10 | |
2f2dc053 | 11 | #include "super.h" |
3d14c5d2 YS |
12 | #include "mds_client.h" |
13 | ||
1fe60e51 | 14 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
15 | #include <linux/ceph/messenger.h> |
16 | #include <linux/ceph/decode.h> | |
17 | #include <linux/ceph/pagelist.h> | |
18 | #include <linux/ceph/auth.h> | |
19 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
20 | |
21 | /* | |
22 | * A cluster of MDS (metadata server) daemons is responsible for | |
23 | * managing the file system namespace (the directory hierarchy and | |
24 | * inodes) and for coordinating shared access to storage. Metadata is | |
25 | * partitioning hierarchically across a number of servers, and that | |
26 | * partition varies over time as the cluster adjusts the distribution | |
27 | * in order to balance load. | |
28 | * | |
29 | * The MDS client is primarily responsible to managing synchronous | |
30 | * metadata requests for operations like open, unlink, and so forth. | |
31 | * If there is a MDS failure, we find out about it when we (possibly | |
32 | * request and) receive a new MDS map, and can resubmit affected | |
33 | * requests. | |
34 | * | |
35 | * For the most part, though, we take advantage of a lossless | |
36 | * communications channel to the MDS, and do not need to worry about | |
37 | * timing out or resubmitting requests. | |
38 | * | |
39 | * We maintain a stateful "session" with each MDS we interact with. | |
40 | * Within each session, we sent periodic heartbeat messages to ensure | |
41 | * any capabilities or leases we have been issues remain valid. If | |
42 | * the session times out and goes stale, our leases and capabilities | |
43 | * are no longer valid. | |
44 | */ | |
45 | ||
20cb34ae | 46 | struct ceph_reconnect_state { |
44c99757 | 47 | int nr_caps; |
20cb34ae SW |
48 | struct ceph_pagelist *pagelist; |
49 | bool flock; | |
50 | }; | |
51 | ||
2f2dc053 SW |
52 | static void __wake_requests(struct ceph_mds_client *mdsc, |
53 | struct list_head *head); | |
54 | ||
9e32789f | 55 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
56 | |
57 | ||
58 | /* | |
59 | * mds reply parsing | |
60 | */ | |
61 | ||
62 | /* | |
63 | * parse individual inode info | |
64 | */ | |
65 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 66 | struct ceph_mds_reply_info_in *info, |
12b4629a | 67 | u64 features) |
2f2dc053 SW |
68 | { |
69 | int err = -EIO; | |
70 | ||
71 | info->in = *p; | |
72 | *p += sizeof(struct ceph_mds_reply_inode) + | |
73 | sizeof(*info->in->fragtree.splits) * | |
74 | le32_to_cpu(info->in->fragtree.nsplits); | |
75 | ||
76 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
77 | ceph_decode_need(p, end, info->symlink_len, bad); | |
78 | info->symlink = *p; | |
79 | *p += info->symlink_len; | |
80 | ||
14303d20 SW |
81 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
82 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
83 | sizeof(info->dir_layout), bad); | |
84 | else | |
85 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
86 | ||
2f2dc053 SW |
87 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
88 | ceph_decode_need(p, end, info->xattr_len, bad); | |
89 | info->xattr_data = *p; | |
90 | *p += info->xattr_len; | |
91 | return 0; | |
92 | bad: | |
93 | return err; | |
94 | } | |
95 | ||
96 | /* | |
97 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
98 | * target inode. | |
99 | */ | |
100 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 101 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 102 | u64 features) |
2f2dc053 SW |
103 | { |
104 | int err; | |
105 | ||
106 | if (info->head->is_dentry) { | |
14303d20 | 107 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
108 | if (err < 0) |
109 | goto out_bad; | |
110 | ||
111 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
112 | goto bad; | |
113 | info->dirfrag = *p; | |
114 | *p += sizeof(*info->dirfrag) + | |
115 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
116 | if (unlikely(*p > end)) | |
117 | goto bad; | |
118 | ||
119 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
120 | ceph_decode_need(p, end, info->dname_len, bad); | |
121 | info->dname = *p; | |
122 | *p += info->dname_len; | |
123 | info->dlease = *p; | |
124 | *p += sizeof(*info->dlease); | |
125 | } | |
126 | ||
127 | if (info->head->is_target) { | |
14303d20 | 128 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
129 | if (err < 0) |
130 | goto out_bad; | |
131 | } | |
132 | ||
133 | if (unlikely(*p != end)) | |
134 | goto bad; | |
135 | return 0; | |
136 | ||
137 | bad: | |
138 | err = -EIO; | |
139 | out_bad: | |
140 | pr_err("problem parsing mds trace %d\n", err); | |
141 | return err; | |
142 | } | |
143 | ||
144 | /* | |
145 | * parse readdir results | |
146 | */ | |
147 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 148 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 149 | u64 features) |
2f2dc053 SW |
150 | { |
151 | u32 num, i = 0; | |
152 | int err; | |
153 | ||
154 | info->dir_dir = *p; | |
155 | if (*p + sizeof(*info->dir_dir) > end) | |
156 | goto bad; | |
157 | *p += sizeof(*info->dir_dir) + | |
158 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
159 | if (*p > end) | |
160 | goto bad; | |
161 | ||
162 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
163 | num = ceph_decode_32(p); |
164 | info->dir_end = ceph_decode_8(p); | |
165 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
166 | if (num == 0) |
167 | goto done; | |
168 | ||
54008399 | 169 | BUG_ON(!info->dir_in); |
2f2dc053 SW |
170 | info->dir_dname = (void *)(info->dir_in + num); |
171 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
172 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
54008399 YZ |
173 | if ((unsigned long)(info->dir_dlease + num) > |
174 | (unsigned long)info->dir_in + info->dir_buf_size) { | |
175 | pr_err("dir contents are larger than expected\n"); | |
176 | WARN_ON(1); | |
177 | goto bad; | |
178 | } | |
2f2dc053 | 179 | |
54008399 | 180 | info->dir_nr = num; |
2f2dc053 SW |
181 | while (num) { |
182 | /* dentry */ | |
183 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 184 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
185 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
186 | info->dir_dname[i] = *p; | |
187 | *p += info->dir_dname_len[i]; | |
188 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
189 | info->dir_dname[i]); | |
190 | info->dir_dlease[i] = *p; | |
191 | *p += sizeof(struct ceph_mds_reply_lease); | |
192 | ||
193 | /* inode */ | |
14303d20 | 194 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
2f2dc053 SW |
195 | if (err < 0) |
196 | goto out_bad; | |
197 | i++; | |
198 | num--; | |
199 | } | |
200 | ||
201 | done: | |
202 | if (*p != end) | |
203 | goto bad; | |
204 | return 0; | |
205 | ||
206 | bad: | |
207 | err = -EIO; | |
208 | out_bad: | |
209 | pr_err("problem parsing dir contents %d\n", err); | |
210 | return err; | |
211 | } | |
212 | ||
25933abd HS |
213 | /* |
214 | * parse fcntl F_GETLK results | |
215 | */ | |
216 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 217 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 218 | u64 features) |
25933abd HS |
219 | { |
220 | if (*p + sizeof(*info->filelock_reply) > end) | |
221 | goto bad; | |
222 | ||
223 | info->filelock_reply = *p; | |
224 | *p += sizeof(*info->filelock_reply); | |
225 | ||
226 | if (unlikely(*p != end)) | |
227 | goto bad; | |
228 | return 0; | |
229 | ||
230 | bad: | |
231 | return -EIO; | |
232 | } | |
233 | ||
6e8575fa SL |
234 | /* |
235 | * parse create results | |
236 | */ | |
237 | static int parse_reply_info_create(void **p, void *end, | |
238 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 239 | u64 features) |
6e8575fa SL |
240 | { |
241 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
242 | if (*p == end) { | |
243 | info->has_create_ino = false; | |
244 | } else { | |
245 | info->has_create_ino = true; | |
246 | info->ino = ceph_decode_64(p); | |
247 | } | |
248 | } | |
249 | ||
250 | if (unlikely(*p != end)) | |
251 | goto bad; | |
252 | return 0; | |
253 | ||
254 | bad: | |
255 | return -EIO; | |
256 | } | |
257 | ||
25933abd HS |
258 | /* |
259 | * parse extra results | |
260 | */ | |
261 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 262 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 263 | u64 features) |
25933abd HS |
264 | { |
265 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 266 | return parse_reply_info_filelock(p, end, info, features); |
8a034497 YZ |
267 | else if (info->head->op == CEPH_MDS_OP_READDIR || |
268 | info->head->op == CEPH_MDS_OP_LSSNAP) | |
14303d20 | 269 | return parse_reply_info_dir(p, end, info, features); |
6e8575fa SL |
270 | else if (info->head->op == CEPH_MDS_OP_CREATE) |
271 | return parse_reply_info_create(p, end, info, features); | |
272 | else | |
273 | return -EIO; | |
25933abd HS |
274 | } |
275 | ||
2f2dc053 SW |
276 | /* |
277 | * parse entire mds reply | |
278 | */ | |
279 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 280 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 281 | u64 features) |
2f2dc053 SW |
282 | { |
283 | void *p, *end; | |
284 | u32 len; | |
285 | int err; | |
286 | ||
287 | info->head = msg->front.iov_base; | |
288 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
289 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
290 | ||
291 | /* trace */ | |
292 | ceph_decode_32_safe(&p, end, len, bad); | |
293 | if (len > 0) { | |
32852a81 | 294 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 295 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
296 | if (err < 0) |
297 | goto out_bad; | |
298 | } | |
299 | ||
25933abd | 300 | /* extra */ |
2f2dc053 SW |
301 | ceph_decode_32_safe(&p, end, len, bad); |
302 | if (len > 0) { | |
32852a81 | 303 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 304 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
305 | if (err < 0) |
306 | goto out_bad; | |
307 | } | |
308 | ||
309 | /* snap blob */ | |
310 | ceph_decode_32_safe(&p, end, len, bad); | |
311 | info->snapblob_len = len; | |
312 | info->snapblob = p; | |
313 | p += len; | |
314 | ||
315 | if (p != end) | |
316 | goto bad; | |
317 | return 0; | |
318 | ||
319 | bad: | |
320 | err = -EIO; | |
321 | out_bad: | |
322 | pr_err("mds parse_reply err %d\n", err); | |
323 | return err; | |
324 | } | |
325 | ||
326 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
327 | { | |
54008399 YZ |
328 | if (!info->dir_in) |
329 | return; | |
330 | free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size)); | |
2f2dc053 SW |
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); | |
54008399 | 515 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
516 | if (req->r_request) |
517 | ceph_msg_put(req->r_request); | |
54008399 | 518 | if (req->r_reply) |
153c8e6b | 519 | ceph_msg_put(req->r_reply); |
153c8e6b | 520 | if (req->r_inode) { |
41b02e1f | 521 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
522 | iput(req->r_inode); |
523 | } | |
524 | if (req->r_locked_dir) | |
41b02e1f | 525 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
153c8e6b SW |
526 | if (req->r_target_inode) |
527 | iput(req->r_target_inode); | |
528 | if (req->r_dentry) | |
529 | dput(req->r_dentry); | |
844d87c3 SW |
530 | if (req->r_old_dentry) |
531 | dput(req->r_old_dentry); | |
532 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
533 | /* |
534 | * track (and drop pins for) r_old_dentry_dir | |
535 | * separately, since r_old_dentry's d_parent may have | |
536 | * changed between the dir mutex being dropped and | |
537 | * this request being freed. | |
538 | */ | |
539 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
540 | CEPH_CAP_PIN); | |
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 | 1313 | } |
a56371d9 YZ |
1314 | |
1315 | ceph_add_cap_releases(mdsc, session); | |
1316 | ceph_send_cap_releases(mdsc, session); | |
2f2dc053 SW |
1317 | return 0; |
1318 | } | |
1319 | ||
1320 | /* | |
1321 | * Allocate cap_release messages. If there is a partially full message | |
1322 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1323 | * we can send it immediately. | |
1324 | * | |
1325 | * Called under s_mutex. | |
1326 | */ | |
2b2300d6 | 1327 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
ee6b272b | 1328 | struct ceph_mds_session *session) |
2f2dc053 | 1329 | { |
38e8883e | 1330 | struct ceph_msg *msg, *partial = NULL; |
2f2dc053 SW |
1331 | struct ceph_mds_cap_release *head; |
1332 | int err = -ENOMEM; | |
3d14c5d2 | 1333 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
38e8883e | 1334 | int num; |
2f2dc053 | 1335 | |
38e8883e SW |
1336 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
1337 | extra); | |
2f2dc053 SW |
1338 | |
1339 | spin_lock(&session->s_cap_lock); | |
1340 | ||
1341 | if (!list_empty(&session->s_cap_releases)) { | |
1342 | msg = list_first_entry(&session->s_cap_releases, | |
1343 | struct ceph_msg, | |
1344 | list_head); | |
1345 | head = msg->front.iov_base; | |
38e8883e SW |
1346 | num = le32_to_cpu(head->num); |
1347 | if (num) { | |
1348 | dout(" partial %p with (%d/%d)\n", msg, num, | |
1349 | (int)CEPH_CAPS_PER_RELEASE); | |
1350 | extra += CEPH_CAPS_PER_RELEASE - num; | |
1351 | partial = msg; | |
1352 | } | |
2f2dc053 | 1353 | } |
2f2dc053 SW |
1354 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
1355 | spin_unlock(&session->s_cap_lock); | |
34d23762 | 1356 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
b61c2763 | 1357 | GFP_NOFS, false); |
2f2dc053 SW |
1358 | if (!msg) |
1359 | goto out_unlocked; | |
1360 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1361 | (int)msg->front.iov_len); | |
1362 | head = msg->front.iov_base; | |
1363 | head->num = cpu_to_le32(0); | |
1364 | msg->front.iov_len = sizeof(*head); | |
1365 | spin_lock(&session->s_cap_lock); | |
1366 | list_add(&msg->list_head, &session->s_cap_releases); | |
1367 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1368 | } | |
1369 | ||
38e8883e SW |
1370 | if (partial) { |
1371 | head = partial->front.iov_base; | |
1372 | num = le32_to_cpu(head->num); | |
1373 | dout(" queueing partial %p with %d/%d\n", partial, num, | |
1374 | (int)CEPH_CAPS_PER_RELEASE); | |
1375 | list_move_tail(&partial->list_head, | |
1376 | &session->s_cap_releases_done); | |
1377 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; | |
2f2dc053 SW |
1378 | } |
1379 | err = 0; | |
1380 | spin_unlock(&session->s_cap_lock); | |
1381 | out_unlocked: | |
1382 | return err; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * flush all dirty inode data to disk. | |
1387 | * | |
1388 | * returns true if we've flushed through want_flush_seq | |
1389 | */ | |
1390 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1391 | { | |
1392 | int mds, ret = 1; | |
1393 | ||
1394 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1395 | mutex_lock(&mdsc->mutex); | |
1396 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1397 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1398 | ||
1399 | if (!session) | |
1400 | continue; | |
1401 | get_session(session); | |
1402 | mutex_unlock(&mdsc->mutex); | |
1403 | ||
1404 | mutex_lock(&session->s_mutex); | |
1405 | if (!list_empty(&session->s_cap_flushing)) { | |
1406 | struct ceph_inode_info *ci = | |
1407 | list_entry(session->s_cap_flushing.next, | |
1408 | struct ceph_inode_info, | |
1409 | i_flushing_item); | |
1410 | struct inode *inode = &ci->vfs_inode; | |
1411 | ||
be655596 | 1412 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1413 | if (ci->i_cap_flush_seq <= want_flush_seq) { |
1414 | dout("check_cap_flush still flushing %p " | |
1415 | "seq %lld <= %lld to mds%d\n", inode, | |
1416 | ci->i_cap_flush_seq, want_flush_seq, | |
1417 | session->s_mds); | |
1418 | ret = 0; | |
1419 | } | |
be655596 | 1420 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1421 | } |
1422 | mutex_unlock(&session->s_mutex); | |
1423 | ceph_put_mds_session(session); | |
1424 | ||
1425 | if (!ret) | |
1426 | return ret; | |
1427 | mutex_lock(&mdsc->mutex); | |
1428 | } | |
1429 | ||
1430 | mutex_unlock(&mdsc->mutex); | |
1431 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | /* | |
1436 | * called under s_mutex | |
1437 | */ | |
3d7ded4d SW |
1438 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1439 | struct ceph_mds_session *session) | |
2f2dc053 SW |
1440 | { |
1441 | struct ceph_msg *msg; | |
1442 | ||
1443 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1444 | spin_lock(&session->s_cap_lock); |
1445 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1446 | msg = list_first_entry(&session->s_cap_releases_done, |
1447 | struct ceph_msg, list_head); | |
1448 | list_del_init(&msg->list_head); | |
1449 | spin_unlock(&session->s_cap_lock); | |
1450 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1451 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1452 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1453 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1454 | } |
1455 | spin_unlock(&session->s_cap_lock); | |
1456 | } | |
1457 | ||
e01a5946 SW |
1458 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1459 | struct ceph_mds_session *session) | |
1460 | { | |
1461 | struct ceph_msg *msg; | |
1462 | struct ceph_mds_cap_release *head; | |
1463 | unsigned num; | |
1464 | ||
1465 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
e01a5946 | 1466 | |
00bd8edb YZ |
1467 | if (!list_empty(&session->s_cap_releases)) { |
1468 | /* zero out the in-progress message */ | |
1469 | msg = list_first_entry(&session->s_cap_releases, | |
1470 | struct ceph_msg, list_head); | |
1471 | head = msg->front.iov_base; | |
1472 | num = le32_to_cpu(head->num); | |
1473 | dout("discard_cap_releases mds%d %p %u\n", | |
1474 | session->s_mds, msg, num); | |
1475 | head->num = cpu_to_le32(0); | |
1476 | msg->front.iov_len = sizeof(*head); | |
1477 | session->s_num_cap_releases += num; | |
1478 | } | |
e01a5946 SW |
1479 | |
1480 | /* requeue completed messages */ | |
1481 | while (!list_empty(&session->s_cap_releases_done)) { | |
1482 | msg = list_first_entry(&session->s_cap_releases_done, | |
1483 | struct ceph_msg, list_head); | |
1484 | list_del_init(&msg->list_head); | |
1485 | ||
1486 | head = msg->front.iov_base; | |
1487 | num = le32_to_cpu(head->num); | |
1488 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1489 | num); | |
1490 | session->s_num_cap_releases += num; | |
1491 | head->num = cpu_to_le32(0); | |
1492 | msg->front.iov_len = sizeof(*head); | |
1493 | list_add(&msg->list_head, &session->s_cap_releases); | |
1494 | } | |
e01a5946 SW |
1495 | } |
1496 | ||
2f2dc053 SW |
1497 | /* |
1498 | * requests | |
1499 | */ | |
1500 | ||
54008399 YZ |
1501 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
1502 | struct inode *dir) | |
1503 | { | |
1504 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1505 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
1506 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
1507 | size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) + | |
1508 | sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease); | |
1509 | int order, num_entries; | |
1510 | ||
1511 | spin_lock(&ci->i_ceph_lock); | |
1512 | num_entries = ci->i_files + ci->i_subdirs; | |
1513 | spin_unlock(&ci->i_ceph_lock); | |
1514 | num_entries = max(num_entries, 1); | |
1515 | num_entries = min(num_entries, opt->max_readdir); | |
1516 | ||
1517 | order = get_order(size * num_entries); | |
1518 | while (order >= 0) { | |
1519 | rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN, | |
1520 | order); | |
1521 | if (rinfo->dir_in) | |
1522 | break; | |
1523 | order--; | |
1524 | } | |
1525 | if (!rinfo->dir_in) | |
1526 | return -ENOMEM; | |
1527 | ||
1528 | num_entries = (PAGE_SIZE << order) / size; | |
1529 | num_entries = min(num_entries, opt->max_readdir); | |
1530 | ||
1531 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
1532 | req->r_num_caps = num_entries + 1; | |
1533 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
1534 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
1535 | return 0; | |
1536 | } | |
1537 | ||
2f2dc053 SW |
1538 | /* |
1539 | * Create an mds request. | |
1540 | */ | |
1541 | struct ceph_mds_request * | |
1542 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1543 | { | |
1544 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1545 | ||
1546 | if (!req) | |
1547 | return ERR_PTR(-ENOMEM); | |
1548 | ||
b4556396 | 1549 | mutex_init(&req->r_fill_mutex); |
37151668 | 1550 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1551 | req->r_started = jiffies; |
1552 | req->r_resend_mds = -1; | |
1553 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1554 | req->r_fmode = -1; | |
153c8e6b | 1555 | kref_init(&req->r_kref); |
2f2dc053 SW |
1556 | INIT_LIST_HEAD(&req->r_wait); |
1557 | init_completion(&req->r_completion); | |
1558 | init_completion(&req->r_safe_completion); | |
1559 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1560 | ||
b8e69066 SW |
1561 | req->r_stamp = CURRENT_TIME; |
1562 | ||
2f2dc053 SW |
1563 | req->r_op = op; |
1564 | req->r_direct_mode = mode; | |
1565 | return req; | |
1566 | } | |
1567 | ||
1568 | /* | |
44ca18f2 | 1569 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1570 | * |
1571 | * called under mdsc->mutex. | |
1572 | */ | |
44ca18f2 SW |
1573 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1574 | { | |
1575 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1576 | return NULL; | |
1577 | return rb_entry(rb_first(&mdsc->request_tree), | |
1578 | struct ceph_mds_request, r_node); | |
1579 | } | |
1580 | ||
2f2dc053 SW |
1581 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1582 | { | |
44ca18f2 SW |
1583 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1584 | ||
1585 | if (req) | |
1586 | return req->r_tid; | |
1587 | return 0; | |
2f2dc053 SW |
1588 | } |
1589 | ||
1590 | /* | |
1591 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1592 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1593 | * | |
1594 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1595 | * inode. | |
1596 | * | |
1597 | * Encode hidden .snap dirs as a double /, i.e. | |
1598 | * foo/.snap/bar -> foo//bar | |
1599 | */ | |
1600 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1601 | int stop_on_nosnap) | |
1602 | { | |
1603 | struct dentry *temp; | |
1604 | char *path; | |
1605 | int len, pos; | |
1b71fe2e | 1606 | unsigned seq; |
2f2dc053 SW |
1607 | |
1608 | if (dentry == NULL) | |
1609 | return ERR_PTR(-EINVAL); | |
1610 | ||
1611 | retry: | |
1612 | len = 0; | |
1b71fe2e AV |
1613 | seq = read_seqbegin(&rename_lock); |
1614 | rcu_read_lock(); | |
2f2dc053 SW |
1615 | for (temp = dentry; !IS_ROOT(temp);) { |
1616 | struct inode *inode = temp->d_inode; | |
1617 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1618 | len++; /* slash only */ | |
1619 | else if (stop_on_nosnap && inode && | |
1620 | ceph_snap(inode) == CEPH_NOSNAP) | |
1621 | break; | |
1622 | else | |
1623 | len += 1 + temp->d_name.len; | |
1624 | temp = temp->d_parent; | |
2f2dc053 | 1625 | } |
1b71fe2e | 1626 | rcu_read_unlock(); |
2f2dc053 SW |
1627 | if (len) |
1628 | len--; /* no leading '/' */ | |
1629 | ||
1630 | path = kmalloc(len+1, GFP_NOFS); | |
1631 | if (path == NULL) | |
1632 | return ERR_PTR(-ENOMEM); | |
1633 | pos = len; | |
1634 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1635 | rcu_read_lock(); |
2f2dc053 | 1636 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1637 | struct inode *inode; |
2f2dc053 | 1638 | |
1b71fe2e AV |
1639 | spin_lock(&temp->d_lock); |
1640 | inode = temp->d_inode; | |
2f2dc053 | 1641 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1642 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1643 | pos, temp); |
1644 | } else if (stop_on_nosnap && inode && | |
1645 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1646 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1647 | break; |
1648 | } else { | |
1649 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1650 | if (pos < 0) { |
1651 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1652 | break; |
1b71fe2e | 1653 | } |
2f2dc053 SW |
1654 | strncpy(path + pos, temp->d_name.name, |
1655 | temp->d_name.len); | |
2f2dc053 | 1656 | } |
1b71fe2e | 1657 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1658 | if (pos) |
1659 | path[--pos] = '/'; | |
1660 | temp = temp->d_parent; | |
2f2dc053 | 1661 | } |
1b71fe2e AV |
1662 | rcu_read_unlock(); |
1663 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1664 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1665 | "expected, namelen is %d, pos is %d\n", len, pos); |
1666 | /* presumably this is only possible if racing with a | |
1667 | rename of one of the parent directories (we can not | |
1668 | lock the dentries above us to prevent this, but | |
1669 | retrying should be harmless) */ | |
1670 | kfree(path); | |
1671 | goto retry; | |
1672 | } | |
1673 | ||
1674 | *base = ceph_ino(temp->d_inode); | |
1675 | *plen = len; | |
104648ad | 1676 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1677 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1678 | return path; |
1679 | } | |
1680 | ||
1681 | static int build_dentry_path(struct dentry *dentry, | |
1682 | const char **ppath, int *ppathlen, u64 *pino, | |
1683 | int *pfreepath) | |
1684 | { | |
1685 | char *path; | |
1686 | ||
1687 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1688 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1689 | *ppath = dentry->d_name.name; | |
1690 | *ppathlen = dentry->d_name.len; | |
1691 | return 0; | |
1692 | } | |
1693 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1694 | if (IS_ERR(path)) | |
1695 | return PTR_ERR(path); | |
1696 | *ppath = path; | |
1697 | *pfreepath = 1; | |
1698 | return 0; | |
1699 | } | |
1700 | ||
1701 | static int build_inode_path(struct inode *inode, | |
1702 | const char **ppath, int *ppathlen, u64 *pino, | |
1703 | int *pfreepath) | |
1704 | { | |
1705 | struct dentry *dentry; | |
1706 | char *path; | |
1707 | ||
1708 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1709 | *pino = ceph_ino(inode); | |
1710 | *ppathlen = 0; | |
1711 | return 0; | |
1712 | } | |
1713 | dentry = d_find_alias(inode); | |
1714 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1715 | dput(dentry); | |
1716 | if (IS_ERR(path)) | |
1717 | return PTR_ERR(path); | |
1718 | *ppath = path; | |
1719 | *pfreepath = 1; | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * request arguments may be specified via an inode *, a dentry *, or | |
1725 | * an explicit ino+path. | |
1726 | */ | |
1727 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1728 | const char *rpath, u64 rino, | |
1729 | const char **ppath, int *pathlen, | |
1730 | u64 *ino, int *freepath) | |
1731 | { | |
1732 | int r = 0; | |
1733 | ||
1734 | if (rinode) { | |
1735 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1736 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1737 | ceph_snap(rinode)); | |
1738 | } else if (rdentry) { | |
1739 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1740 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1741 | *ppath); | |
795858db | 1742 | } else if (rpath || rino) { |
2f2dc053 SW |
1743 | *ino = rino; |
1744 | *ppath = rpath; | |
b000056a | 1745 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1746 | dout(" path %.*s\n", *pathlen, rpath); |
1747 | } | |
1748 | ||
1749 | return r; | |
1750 | } | |
1751 | ||
1752 | /* | |
1753 | * called under mdsc->mutex | |
1754 | */ | |
1755 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1756 | struct ceph_mds_request *req, | |
1757 | int mds) | |
1758 | { | |
1759 | struct ceph_msg *msg; | |
1760 | struct ceph_mds_request_head *head; | |
1761 | const char *path1 = NULL; | |
1762 | const char *path2 = NULL; | |
1763 | u64 ino1 = 0, ino2 = 0; | |
1764 | int pathlen1 = 0, pathlen2 = 0; | |
1765 | int freepath1 = 0, freepath2 = 0; | |
1766 | int len; | |
1767 | u16 releases; | |
1768 | void *p, *end; | |
1769 | int ret; | |
1770 | ||
1771 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1772 | req->r_path1, req->r_ino1.ino, | |
1773 | &path1, &pathlen1, &ino1, &freepath1); | |
1774 | if (ret < 0) { | |
1775 | msg = ERR_PTR(ret); | |
1776 | goto out; | |
1777 | } | |
1778 | ||
1779 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1780 | req->r_path2, req->r_ino2.ino, | |
1781 | &path2, &pathlen2, &ino2, &freepath2); | |
1782 | if (ret < 0) { | |
1783 | msg = ERR_PTR(ret); | |
1784 | goto out_free1; | |
1785 | } | |
1786 | ||
1787 | len = sizeof(*head) + | |
b8e69066 SW |
1788 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
1789 | sizeof(struct timespec); | |
2f2dc053 SW |
1790 | |
1791 | /* calculate (max) length for cap releases */ | |
1792 | len += sizeof(struct ceph_mds_request_release) * | |
1793 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1794 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1795 | if (req->r_dentry_drop) | |
1796 | len += req->r_dentry->d_name.len; | |
1797 | if (req->r_old_dentry_drop) | |
1798 | len += req->r_old_dentry->d_name.len; | |
1799 | ||
b61c2763 | 1800 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
1801 | if (!msg) { |
1802 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1803 | goto out_free2; |
a79832f2 | 1804 | } |
2f2dc053 | 1805 | |
b8e69066 | 1806 | msg->hdr.version = 2; |
6df058c0 SW |
1807 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1808 | ||
2f2dc053 SW |
1809 | head = msg->front.iov_base; |
1810 | p = msg->front.iov_base + sizeof(*head); | |
1811 | end = msg->front.iov_base + msg->front.iov_len; | |
1812 | ||
1813 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1814 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
1815 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
1816 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
1817 | head->args = req->r_args; |
1818 | ||
1819 | ceph_encode_filepath(&p, end, ino1, path1); | |
1820 | ceph_encode_filepath(&p, end, ino2, path2); | |
1821 | ||
e979cf50 SW |
1822 | /* make note of release offset, in case we need to replay */ |
1823 | req->r_request_release_offset = p - msg->front.iov_base; | |
1824 | ||
2f2dc053 SW |
1825 | /* cap releases */ |
1826 | releases = 0; | |
1827 | if (req->r_inode_drop) | |
1828 | releases += ceph_encode_inode_release(&p, | |
1829 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1830 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1831 | if (req->r_dentry_drop) | |
1832 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1833 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1834 | if (req->r_old_dentry_drop) | |
1835 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1836 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1837 | if (req->r_old_inode_drop) | |
1838 | releases += ceph_encode_inode_release(&p, | |
1839 | req->r_old_dentry->d_inode, | |
1840 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1841 | head->num_releases = cpu_to_le16(releases); | |
1842 | ||
b8e69066 SW |
1843 | /* time stamp */ |
1844 | ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp)); | |
1845 | ||
2f2dc053 SW |
1846 | BUG_ON(p > end); |
1847 | msg->front.iov_len = p - msg->front.iov_base; | |
1848 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1849 | ||
ebf18f47 AE |
1850 | if (req->r_data_len) { |
1851 | /* outbound data set only by ceph_sync_setxattr() */ | |
1852 | BUG_ON(!req->r_pages); | |
90af3602 | 1853 | ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0); |
ebf18f47 | 1854 | } |
02afca6c | 1855 | |
2f2dc053 SW |
1856 | msg->hdr.data_len = cpu_to_le32(req->r_data_len); |
1857 | msg->hdr.data_off = cpu_to_le16(0); | |
1858 | ||
1859 | out_free2: | |
1860 | if (freepath2) | |
1861 | kfree((char *)path2); | |
1862 | out_free1: | |
1863 | if (freepath1) | |
1864 | kfree((char *)path1); | |
1865 | out: | |
1866 | return msg; | |
1867 | } | |
1868 | ||
1869 | /* | |
1870 | * called under mdsc->mutex if error, under no mutex if | |
1871 | * success. | |
1872 | */ | |
1873 | static void complete_request(struct ceph_mds_client *mdsc, | |
1874 | struct ceph_mds_request *req) | |
1875 | { | |
1876 | if (req->r_callback) | |
1877 | req->r_callback(mdsc, req); | |
1878 | else | |
03066f23 | 1879 | complete_all(&req->r_completion); |
2f2dc053 SW |
1880 | } |
1881 | ||
1882 | /* | |
1883 | * called under mdsc->mutex | |
1884 | */ | |
1885 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1886 | struct ceph_mds_request *req, | |
1887 | int mds) | |
1888 | { | |
1889 | struct ceph_mds_request_head *rhead; | |
1890 | struct ceph_msg *msg; | |
1891 | int flags = 0; | |
1892 | ||
2f2dc053 | 1893 | req->r_attempts++; |
e55b71f8 GF |
1894 | if (req->r_inode) { |
1895 | struct ceph_cap *cap = | |
1896 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
1897 | ||
1898 | if (cap) | |
1899 | req->r_sent_on_mseq = cap->mseq; | |
1900 | else | |
1901 | req->r_sent_on_mseq = -1; | |
1902 | } | |
2f2dc053 SW |
1903 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
1904 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1905 | ||
01a92f17 SW |
1906 | if (req->r_got_unsafe) { |
1907 | /* | |
1908 | * Replay. Do not regenerate message (and rebuild | |
1909 | * paths, etc.); just use the original message. | |
1910 | * Rebuilding paths will break for renames because | |
1911 | * d_move mangles the src name. | |
1912 | */ | |
1913 | msg = req->r_request; | |
1914 | rhead = msg->front.iov_base; | |
1915 | ||
1916 | flags = le32_to_cpu(rhead->flags); | |
1917 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1918 | rhead->flags = cpu_to_le32(flags); | |
1919 | ||
1920 | if (req->r_target_inode) | |
1921 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
1922 | ||
1923 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
1924 | |
1925 | /* remove cap/dentry releases from message */ | |
1926 | rhead->num_releases = 0; | |
1927 | msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset); | |
1928 | msg->front.iov_len = req->r_request_release_offset; | |
01a92f17 SW |
1929 | return 0; |
1930 | } | |
1931 | ||
2f2dc053 SW |
1932 | if (req->r_request) { |
1933 | ceph_msg_put(req->r_request); | |
1934 | req->r_request = NULL; | |
1935 | } | |
1936 | msg = create_request_message(mdsc, req, mds); | |
1937 | if (IS_ERR(msg)) { | |
e1518c7c | 1938 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 1939 | complete_request(mdsc, req); |
a79832f2 | 1940 | return PTR_ERR(msg); |
2f2dc053 SW |
1941 | } |
1942 | req->r_request = msg; | |
1943 | ||
1944 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
1945 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
1946 | if (req->r_got_unsafe) | |
1947 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1948 | if (req->r_locked_dir) | |
1949 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
1950 | rhead->flags = cpu_to_le32(flags); | |
1951 | rhead->num_fwd = req->r_num_fwd; | |
1952 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 1953 | rhead->ino = 0; |
2f2dc053 SW |
1954 | |
1955 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
1956 | return 0; |
1957 | } | |
1958 | ||
1959 | /* | |
1960 | * send request, or put it on the appropriate wait list. | |
1961 | */ | |
1962 | static int __do_request(struct ceph_mds_client *mdsc, | |
1963 | struct ceph_mds_request *req) | |
1964 | { | |
1965 | struct ceph_mds_session *session = NULL; | |
1966 | int mds = -1; | |
1967 | int err = -EAGAIN; | |
1968 | ||
eb1b8af3 YZ |
1969 | if (req->r_err || req->r_got_result) { |
1970 | if (req->r_aborted) | |
1971 | __unregister_request(mdsc, req); | |
2f2dc053 | 1972 | goto out; |
eb1b8af3 | 1973 | } |
2f2dc053 SW |
1974 | |
1975 | if (req->r_timeout && | |
1976 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
1977 | dout("do_request timed out\n"); | |
1978 | err = -EIO; | |
1979 | goto finish; | |
1980 | } | |
1981 | ||
dc69e2e9 SW |
1982 | put_request_session(req); |
1983 | ||
2f2dc053 SW |
1984 | mds = __choose_mds(mdsc, req); |
1985 | if (mds < 0 || | |
1986 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
1987 | dout("do_request no mds or not active, waiting for map\n"); | |
1988 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
1989 | goto out; | |
1990 | } | |
1991 | ||
1992 | /* get, open session */ | |
1993 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 1994 | if (!session) { |
2f2dc053 | 1995 | session = register_session(mdsc, mds); |
9c423956 SW |
1996 | if (IS_ERR(session)) { |
1997 | err = PTR_ERR(session); | |
1998 | goto finish; | |
1999 | } | |
2000 | } | |
dc69e2e9 SW |
2001 | req->r_session = get_session(session); |
2002 | ||
2f2dc053 SW |
2003 | dout("do_request mds%d session %p state %s\n", mds, session, |
2004 | session_state_name(session->s_state)); | |
2005 | if (session->s_state != CEPH_MDS_SESSION_OPEN && | |
2006 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
2007 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
2008 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
2009 | __open_session(mdsc, session); | |
2010 | list_add(&req->r_wait, &session->s_waiting); | |
2011 | goto out_session; | |
2012 | } | |
2013 | ||
2014 | /* send request */ | |
2f2dc053 SW |
2015 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2016 | ||
2017 | if (req->r_request_started == 0) /* note request start time */ | |
2018 | req->r_request_started = jiffies; | |
2019 | ||
2020 | err = __prepare_send_request(mdsc, req, mds); | |
2021 | if (!err) { | |
2022 | ceph_msg_get(req->r_request); | |
2023 | ceph_con_send(&session->s_con, req->r_request); | |
2024 | } | |
2025 | ||
2026 | out_session: | |
2027 | ceph_put_mds_session(session); | |
2028 | out: | |
2029 | return err; | |
2030 | ||
2031 | finish: | |
e1518c7c | 2032 | req->r_err = err; |
2f2dc053 SW |
2033 | complete_request(mdsc, req); |
2034 | goto out; | |
2035 | } | |
2036 | ||
2037 | /* | |
2038 | * called under mdsc->mutex | |
2039 | */ | |
2040 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
2041 | struct list_head *head) | |
2042 | { | |
ed75ec2c YZ |
2043 | struct ceph_mds_request *req; |
2044 | LIST_HEAD(tmp_list); | |
2045 | ||
2046 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 2047 | |
ed75ec2c YZ |
2048 | while (!list_empty(&tmp_list)) { |
2049 | req = list_entry(tmp_list.next, | |
2050 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2051 | list_del_init(&req->r_wait); |
7971bd92 | 2052 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2053 | __do_request(mdsc, req); |
2054 | } | |
2055 | } | |
2056 | ||
2057 | /* | |
2058 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2059 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2060 | */ |
29790f26 | 2061 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2062 | { |
44ca18f2 SW |
2063 | struct ceph_mds_request *req; |
2064 | struct rb_node *p; | |
2f2dc053 SW |
2065 | |
2066 | dout("kick_requests mds%d\n", mds); | |
44ca18f2 SW |
2067 | for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) { |
2068 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
2069 | if (req->r_got_unsafe) | |
2070 | continue; | |
2071 | if (req->r_session && | |
2072 | req->r_session->s_mds == mds) { | |
2073 | dout(" kicking tid %llu\n", req->r_tid); | |
44ca18f2 | 2074 | __do_request(mdsc, req); |
2f2dc053 SW |
2075 | } |
2076 | } | |
2077 | } | |
2078 | ||
2079 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2080 | struct ceph_mds_request *req) | |
2081 | { | |
2082 | dout("submit_request on %p\n", req); | |
2083 | mutex_lock(&mdsc->mutex); | |
2084 | __register_request(mdsc, req, NULL); | |
2085 | __do_request(mdsc, req); | |
2086 | mutex_unlock(&mdsc->mutex); | |
2087 | } | |
2088 | ||
2089 | /* | |
2090 | * Synchrously perform an mds request. Take care of all of the | |
2091 | * session setup, forwarding, retry details. | |
2092 | */ | |
2093 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2094 | struct inode *dir, | |
2095 | struct ceph_mds_request *req) | |
2096 | { | |
2097 | int err; | |
2098 | ||
2099 | dout("do_request on %p\n", req); | |
2100 | ||
2101 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
2102 | if (req->r_inode) | |
2103 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
2104 | if (req->r_locked_dir) | |
2105 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
844d87c3 | 2106 | if (req->r_old_dentry_dir) |
41b02e1f SW |
2107 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2108 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2109 | |
2110 | /* issue */ | |
2111 | mutex_lock(&mdsc->mutex); | |
2112 | __register_request(mdsc, req, dir); | |
2113 | __do_request(mdsc, req); | |
2114 | ||
e1518c7c SW |
2115 | if (req->r_err) { |
2116 | err = req->r_err; | |
2117 | __unregister_request(mdsc, req); | |
2118 | dout("do_request early error %d\n", err); | |
2119 | goto out; | |
2f2dc053 SW |
2120 | } |
2121 | ||
e1518c7c SW |
2122 | /* wait */ |
2123 | mutex_unlock(&mdsc->mutex); | |
2124 | dout("do_request waiting\n"); | |
2125 | if (req->r_timeout) { | |
aa91647c | 2126 | err = (long)wait_for_completion_killable_timeout( |
e1518c7c SW |
2127 | &req->r_completion, req->r_timeout); |
2128 | if (err == 0) | |
2129 | err = -EIO; | |
2130 | } else { | |
aa91647c | 2131 | err = wait_for_completion_killable(&req->r_completion); |
e1518c7c SW |
2132 | } |
2133 | dout("do_request waited, got %d\n", err); | |
2134 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2135 | |
e1518c7c SW |
2136 | /* only abort if we didn't race with a real reply */ |
2137 | if (req->r_got_result) { | |
2138 | err = le32_to_cpu(req->r_reply_info.head->result); | |
2139 | } else if (err < 0) { | |
2140 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2141 | |
2142 | /* | |
2143 | * ensure we aren't running concurrently with | |
2144 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2145 | * rely on locks (dir mutex) held by our caller. | |
2146 | */ | |
2147 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
2148 | req->r_err = err; |
2149 | req->r_aborted = true; | |
b4556396 | 2150 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2151 | |
e1518c7c | 2152 | if (req->r_locked_dir && |
167c9e35 SW |
2153 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2154 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2155 | } else { |
e1518c7c | 2156 | err = req->r_err; |
2f2dc053 | 2157 | } |
2f2dc053 | 2158 | |
e1518c7c SW |
2159 | out: |
2160 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2161 | dout("do_request %p done, result %d\n", req, err); |
2162 | return err; | |
2163 | } | |
2164 | ||
167c9e35 | 2165 | /* |
2f276c51 | 2166 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2167 | * namespace request. |
2168 | */ | |
2169 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2170 | { | |
2171 | struct inode *inode = req->r_locked_dir; | |
167c9e35 | 2172 | |
2f276c51 | 2173 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2174 | |
2f276c51 | 2175 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2176 | if (req->r_dentry) |
2177 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2178 | if (req->r_old_dentry) | |
2179 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2180 | } | |
2181 | ||
2f2dc053 SW |
2182 | /* |
2183 | * Handle mds reply. | |
2184 | * | |
2185 | * We take the session mutex and parse and process the reply immediately. | |
2186 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2187 | * by the MDS as they are applied to our local cache. | |
2188 | */ | |
2189 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2190 | { | |
2191 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2192 | struct ceph_mds_request *req; | |
2193 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2194 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
2195 | u64 tid; | |
2196 | int err, result; | |
2600d2dd | 2197 | int mds = session->s_mds; |
2f2dc053 | 2198 | |
2f2dc053 SW |
2199 | if (msg->front.iov_len < sizeof(*head)) { |
2200 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2201 | ceph_msg_dump(msg); |
2f2dc053 SW |
2202 | return; |
2203 | } | |
2204 | ||
2205 | /* get request, session */ | |
6df058c0 | 2206 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2207 | mutex_lock(&mdsc->mutex); |
2208 | req = __lookup_request(mdsc, tid); | |
2209 | if (!req) { | |
2210 | dout("handle_reply on unknown tid %llu\n", tid); | |
2211 | mutex_unlock(&mdsc->mutex); | |
2212 | return; | |
2213 | } | |
2214 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2215 | |
2216 | /* correct session? */ | |
d96d6049 | 2217 | if (req->r_session != session) { |
2f2dc053 SW |
2218 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2219 | " not mds%d\n", tid, session->s_mds, | |
2220 | req->r_session ? req->r_session->s_mds : -1); | |
2221 | mutex_unlock(&mdsc->mutex); | |
2222 | goto out; | |
2223 | } | |
2224 | ||
2225 | /* dup? */ | |
2226 | if ((req->r_got_unsafe && !head->safe) || | |
2227 | (req->r_got_safe && head->safe)) { | |
f3ae1b97 | 2228 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
2229 | head->safe ? "safe" : "unsafe", tid, mds); |
2230 | mutex_unlock(&mdsc->mutex); | |
2231 | goto out; | |
2232 | } | |
85792d0d | 2233 | if (req->r_got_safe && !head->safe) { |
f3ae1b97 | 2234 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
2235 | tid, mds); |
2236 | mutex_unlock(&mdsc->mutex); | |
2237 | goto out; | |
2238 | } | |
2f2dc053 SW |
2239 | |
2240 | result = le32_to_cpu(head->result); | |
2241 | ||
2242 | /* | |
e55b71f8 GF |
2243 | * Handle an ESTALE |
2244 | * if we're not talking to the authority, send to them | |
2245 | * if the authority has changed while we weren't looking, | |
2246 | * send to new authority | |
2247 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2248 | */ |
2249 | if (result == -ESTALE) { | |
e55b71f8 | 2250 | dout("got ESTALE on request %llu", req->r_tid); |
ca18bede | 2251 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2252 | dout("not using auth, setting for that now"); |
2253 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2254 | __do_request(mdsc, req); |
2255 | mutex_unlock(&mdsc->mutex); | |
2256 | goto out; | |
e55b71f8 | 2257 | } else { |
ca18bede YZ |
2258 | int mds = __choose_mds(mdsc, req); |
2259 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2260 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2261 | __do_request(mdsc, req); |
2262 | mutex_unlock(&mdsc->mutex); | |
2263 | goto out; | |
2264 | } | |
2f2dc053 | 2265 | } |
e55b71f8 | 2266 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2267 | } |
2268 | ||
e55b71f8 | 2269 | |
2f2dc053 SW |
2270 | if (head->safe) { |
2271 | req->r_got_safe = true; | |
2272 | __unregister_request(mdsc, req); | |
2f2dc053 SW |
2273 | |
2274 | if (req->r_got_unsafe) { | |
2275 | /* | |
2276 | * We already handled the unsafe response, now do the | |
2277 | * cleanup. No need to examine the response; the MDS | |
2278 | * doesn't include any result info in the safe | |
2279 | * response. And even if it did, there is nothing | |
2280 | * useful we could do with a revised return value. | |
2281 | */ | |
2282 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2283 | list_del_init(&req->r_unsafe_item); | |
2284 | ||
2285 | /* last unsafe request during umount? */ | |
44ca18f2 | 2286 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2287 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2288 | mutex_unlock(&mdsc->mutex); |
2289 | goto out; | |
2290 | } | |
e1518c7c | 2291 | } else { |
2f2dc053 SW |
2292 | req->r_got_unsafe = true; |
2293 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
2294 | } | |
2295 | ||
2296 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2297 | rinfo = &req->r_reply_info; | |
14303d20 | 2298 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2299 | mutex_unlock(&mdsc->mutex); |
2300 | ||
2301 | mutex_lock(&session->s_mutex); | |
2302 | if (err < 0) { | |
25933abd | 2303 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2304 | ceph_msg_dump(msg); |
2f2dc053 SW |
2305 | goto out_err; |
2306 | } | |
2307 | ||
2308 | /* snap trace */ | |
2309 | if (rinfo->snapblob_len) { | |
2310 | down_write(&mdsc->snap_rwsem); | |
2311 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
2312 | rinfo->snapblob + rinfo->snapblob_len, | |
2313 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
2314 | downgrade_write(&mdsc->snap_rwsem); | |
2315 | } else { | |
2316 | down_read(&mdsc->snap_rwsem); | |
2317 | } | |
2318 | ||
2319 | /* insert trace into our cache */ | |
b4556396 | 2320 | mutex_lock(&req->r_fill_mutex); |
3d14c5d2 | 2321 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2322 | if (err == 0) { |
6e8575fa | 2323 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2324 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2325 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2326 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2327 | } |
b4556396 | 2328 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2329 | |
2330 | up_read(&mdsc->snap_rwsem); | |
2331 | out_err: | |
e1518c7c SW |
2332 | mutex_lock(&mdsc->mutex); |
2333 | if (!req->r_aborted) { | |
2334 | if (err) { | |
2335 | req->r_err = err; | |
2336 | } else { | |
2337 | req->r_reply = msg; | |
2338 | ceph_msg_get(msg); | |
2339 | req->r_got_result = true; | |
2340 | } | |
2f2dc053 | 2341 | } else { |
e1518c7c | 2342 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2343 | } |
e1518c7c | 2344 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2345 | |
ee6b272b | 2346 | ceph_add_cap_releases(mdsc, req->r_session); |
2f2dc053 SW |
2347 | mutex_unlock(&session->s_mutex); |
2348 | ||
2349 | /* kick calling process */ | |
2350 | complete_request(mdsc, req); | |
2351 | out: | |
2352 | ceph_mdsc_put_request(req); | |
2353 | return; | |
2354 | } | |
2355 | ||
2356 | ||
2357 | ||
2358 | /* | |
2359 | * handle mds notification that our request has been forwarded. | |
2360 | */ | |
2600d2dd SW |
2361 | static void handle_forward(struct ceph_mds_client *mdsc, |
2362 | struct ceph_mds_session *session, | |
2363 | struct ceph_msg *msg) | |
2f2dc053 SW |
2364 | { |
2365 | struct ceph_mds_request *req; | |
a1ea787c | 2366 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2367 | u32 next_mds; |
2368 | u32 fwd_seq; | |
2f2dc053 SW |
2369 | int err = -EINVAL; |
2370 | void *p = msg->front.iov_base; | |
2371 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2372 | |
a1ea787c | 2373 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2374 | next_mds = ceph_decode_32(&p); |
2375 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2376 | |
2377 | mutex_lock(&mdsc->mutex); | |
2378 | req = __lookup_request(mdsc, tid); | |
2379 | if (!req) { | |
2a8e5e36 | 2380 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2381 | goto out; /* dup reply? */ |
2382 | } | |
2383 | ||
2a8e5e36 SW |
2384 | if (req->r_aborted) { |
2385 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2386 | __unregister_request(mdsc, req); | |
2387 | } else if (fwd_seq <= req->r_num_fwd) { | |
2388 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2389 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2390 | } else { | |
2391 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2392 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2393 | BUG_ON(req->r_err); | |
2394 | BUG_ON(req->r_got_result); | |
2f2dc053 SW |
2395 | req->r_num_fwd = fwd_seq; |
2396 | req->r_resend_mds = next_mds; | |
2397 | put_request_session(req); | |
2398 | __do_request(mdsc, req); | |
2399 | } | |
2400 | ceph_mdsc_put_request(req); | |
2401 | out: | |
2402 | mutex_unlock(&mdsc->mutex); | |
2403 | return; | |
2404 | ||
2405 | bad: | |
2406 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2407 | } | |
2408 | ||
2409 | /* | |
2410 | * handle a mds session control message | |
2411 | */ | |
2412 | static void handle_session(struct ceph_mds_session *session, | |
2413 | struct ceph_msg *msg) | |
2414 | { | |
2415 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2416 | u32 op; | |
2417 | u64 seq; | |
2600d2dd | 2418 | int mds = session->s_mds; |
2f2dc053 SW |
2419 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2420 | int wake = 0; | |
2421 | ||
2f2dc053 SW |
2422 | /* decode */ |
2423 | if (msg->front.iov_len != sizeof(*h)) | |
2424 | goto bad; | |
2425 | op = le32_to_cpu(h->op); | |
2426 | seq = le64_to_cpu(h->seq); | |
2427 | ||
2428 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2429 | if (op == CEPH_SESSION_CLOSE) |
2430 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2431 | /* FIXME: this ttl calculation is generous */ |
2432 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2433 | mutex_unlock(&mdsc->mutex); | |
2434 | ||
2435 | mutex_lock(&session->s_mutex); | |
2436 | ||
2437 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2438 | mds, ceph_session_op_name(op), session, | |
2439 | session_state_name(session->s_state), seq); | |
2440 | ||
2441 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2442 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2443 | pr_info("mds%d came back\n", session->s_mds); | |
2444 | } | |
2445 | ||
2446 | switch (op) { | |
2447 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2448 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2449 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2450 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2451 | renewed_caps(mdsc, session, 0); | |
2452 | wake = 1; | |
2453 | if (mdsc->stopping) | |
2454 | __close_session(mdsc, session); | |
2455 | break; | |
2456 | ||
2457 | case CEPH_SESSION_RENEWCAPS: | |
2458 | if (session->s_renew_seq == seq) | |
2459 | renewed_caps(mdsc, session, 1); | |
2460 | break; | |
2461 | ||
2462 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2463 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2464 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 SW |
2465 | remove_session_caps(session); |
2466 | wake = 1; /* for good measure */ | |
f3c60c59 | 2467 | wake_up_all(&mdsc->session_close_wq); |
29790f26 | 2468 | kick_requests(mdsc, mds); |
2f2dc053 SW |
2469 | break; |
2470 | ||
2471 | case CEPH_SESSION_STALE: | |
2472 | pr_info("mds%d caps went stale, renewing\n", | |
2473 | session->s_mds); | |
d8fb02ab | 2474 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2475 | session->s_cap_gen++; |
1ce208a6 | 2476 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2477 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2478 | send_renew_caps(mdsc, session); |
2479 | break; | |
2480 | ||
2481 | case CEPH_SESSION_RECALL_STATE: | |
2482 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2483 | break; | |
2484 | ||
186e4f7a YZ |
2485 | case CEPH_SESSION_FLUSHMSG: |
2486 | send_flushmsg_ack(mdsc, session, seq); | |
2487 | break; | |
2488 | ||
2f2dc053 SW |
2489 | default: |
2490 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2491 | WARN_ON(1); | |
2492 | } | |
2493 | ||
2494 | mutex_unlock(&session->s_mutex); | |
2495 | if (wake) { | |
2496 | mutex_lock(&mdsc->mutex); | |
2497 | __wake_requests(mdsc, &session->s_waiting); | |
2498 | mutex_unlock(&mdsc->mutex); | |
2499 | } | |
2500 | return; | |
2501 | ||
2502 | bad: | |
2503 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2504 | (int)msg->front.iov_len); | |
9ec7cab1 | 2505 | ceph_msg_dump(msg); |
2f2dc053 SW |
2506 | return; |
2507 | } | |
2508 | ||
2509 | ||
2510 | /* | |
2511 | * called under session->mutex. | |
2512 | */ | |
2513 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2514 | struct ceph_mds_session *session) | |
2515 | { | |
2516 | struct ceph_mds_request *req, *nreq; | |
2517 | int err; | |
2518 | ||
2519 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2520 | ||
2521 | mutex_lock(&mdsc->mutex); | |
2522 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2523 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2524 | if (!err) { | |
2525 | ceph_msg_get(req->r_request); | |
2526 | ceph_con_send(&session->s_con, req->r_request); | |
2527 | } | |
2528 | } | |
2529 | mutex_unlock(&mdsc->mutex); | |
2530 | } | |
2531 | ||
2532 | /* | |
2533 | * Encode information about a cap for a reconnect with the MDS. | |
2534 | */ | |
2f2dc053 SW |
2535 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2536 | void *arg) | |
2537 | { | |
20cb34ae SW |
2538 | union { |
2539 | struct ceph_mds_cap_reconnect v2; | |
2540 | struct ceph_mds_cap_reconnect_v1 v1; | |
2541 | } rec; | |
2542 | size_t reclen; | |
2f2dc053 | 2543 | struct ceph_inode_info *ci; |
20cb34ae SW |
2544 | struct ceph_reconnect_state *recon_state = arg; |
2545 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2546 | char *path; |
2547 | int pathlen, err; | |
2548 | u64 pathbase; | |
2549 | struct dentry *dentry; | |
2550 | ||
2551 | ci = cap->ci; | |
2552 | ||
2553 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2554 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2555 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2556 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2557 | if (err) | |
2558 | return err; | |
2f2dc053 SW |
2559 | |
2560 | dentry = d_find_alias(inode); | |
2561 | if (dentry) { | |
2562 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2563 | if (IS_ERR(path)) { | |
2564 | err = PTR_ERR(path); | |
e072f8aa | 2565 | goto out_dput; |
2f2dc053 SW |
2566 | } |
2567 | } else { | |
2568 | path = NULL; | |
2569 | pathlen = 0; | |
2570 | } | |
93cea5be SW |
2571 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2572 | if (err) | |
e072f8aa | 2573 | goto out_free; |
2f2dc053 | 2574 | |
be655596 | 2575 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2576 | cap->seq = 0; /* reset cap seq */ |
2577 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2578 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2579 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae SW |
2580 | |
2581 | if (recon_state->flock) { | |
2582 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); | |
2583 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2584 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2585 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2586 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2587 | rec.v2.flock_len = 0; | |
2588 | reclen = sizeof(rec.v2); | |
2589 | } else { | |
2590 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2591 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2592 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2593 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2594 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2595 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2596 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2597 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
2598 | reclen = sizeof(rec.v1); | |
2599 | } | |
be655596 | 2600 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2601 | |
40819f6f GF |
2602 | if (recon_state->flock) { |
2603 | int num_fcntl_locks, num_flock_locks; | |
39be95e9 JS |
2604 | struct ceph_filelock *flocks; |
2605 | ||
2606 | encode_again: | |
1c8c601a | 2607 | spin_lock(&inode->i_lock); |
39be95e9 | 2608 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); |
1c8c601a | 2609 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2610 | flocks = kmalloc((num_fcntl_locks+num_flock_locks) * |
2611 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2612 | if (!flocks) { | |
2613 | err = -ENOMEM; | |
2614 | goto out_free; | |
2615 | } | |
1c8c601a | 2616 | spin_lock(&inode->i_lock); |
39be95e9 JS |
2617 | err = ceph_encode_locks_to_buffer(inode, flocks, |
2618 | num_fcntl_locks, | |
2619 | num_flock_locks); | |
1c8c601a | 2620 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2621 | if (err) { |
2622 | kfree(flocks); | |
2623 | if (err == -ENOSPC) | |
2624 | goto encode_again; | |
2625 | goto out_free; | |
2626 | } | |
2627 | /* | |
2628 | * number of encoded locks is stable, so copy to pagelist | |
2629 | */ | |
2630 | rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + | |
2631 | (num_fcntl_locks+num_flock_locks) * | |
2632 | sizeof(struct ceph_filelock)); | |
2633 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
2634 | if (!err) | |
2635 | err = ceph_locks_to_pagelist(flocks, pagelist, | |
2636 | num_fcntl_locks, | |
2637 | num_flock_locks); | |
2638 | kfree(flocks); | |
3612abbd SW |
2639 | } else { |
2640 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
40819f6f | 2641 | } |
44c99757 YZ |
2642 | |
2643 | recon_state->nr_caps++; | |
e072f8aa | 2644 | out_free: |
2f2dc053 | 2645 | kfree(path); |
e072f8aa | 2646 | out_dput: |
2f2dc053 | 2647 | dput(dentry); |
93cea5be | 2648 | return err; |
2f2dc053 SW |
2649 | } |
2650 | ||
2651 | ||
2652 | /* | |
2653 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2654 | * reestablish shared state. This includes all caps issued through | |
2655 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2656 | * clear which snap realms the mds cares about, we send everything we | |
2657 | * know about.. that ensures we'll then get any new info the | |
2658 | * recovering MDS might have. | |
2659 | * | |
2660 | * This is a relatively heavyweight operation, but it's rare. | |
2661 | * | |
2662 | * called with mdsc->mutex held. | |
2663 | */ | |
34b6c855 SW |
2664 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2665 | struct ceph_mds_session *session) | |
2f2dc053 | 2666 | { |
2f2dc053 | 2667 | struct ceph_msg *reply; |
a105f00c | 2668 | struct rb_node *p; |
34b6c855 | 2669 | int mds = session->s_mds; |
9abf82b8 | 2670 | int err = -ENOMEM; |
44c99757 | 2671 | int s_nr_caps; |
93cea5be | 2672 | struct ceph_pagelist *pagelist; |
20cb34ae | 2673 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2674 | |
34b6c855 | 2675 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2676 | |
93cea5be SW |
2677 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2678 | if (!pagelist) | |
2679 | goto fail_nopagelist; | |
2680 | ceph_pagelist_init(pagelist); | |
2681 | ||
b61c2763 | 2682 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 2683 | if (!reply) |
93cea5be | 2684 | goto fail_nomsg; |
93cea5be | 2685 | |
34b6c855 SW |
2686 | mutex_lock(&session->s_mutex); |
2687 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2688 | session->s_seq = 0; | |
2f2dc053 | 2689 | |
a53aab64 | 2690 | ceph_con_close(&session->s_con); |
34b6c855 | 2691 | ceph_con_open(&session->s_con, |
b7a9e5dd | 2692 | CEPH_ENTITY_TYPE_MDS, mds, |
34b6c855 | 2693 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); |
2f2dc053 | 2694 | |
34b6c855 SW |
2695 | /* replay unsafe requests */ |
2696 | replay_unsafe_requests(mdsc, session); | |
2f2dc053 SW |
2697 | |
2698 | down_read(&mdsc->snap_rwsem); | |
2699 | ||
2f2dc053 SW |
2700 | dout("session %p state %s\n", session, |
2701 | session_state_name(session->s_state)); | |
2702 | ||
99a9c273 YZ |
2703 | spin_lock(&session->s_gen_ttl_lock); |
2704 | session->s_cap_gen++; | |
2705 | spin_unlock(&session->s_gen_ttl_lock); | |
2706 | ||
2707 | spin_lock(&session->s_cap_lock); | |
2708 | /* | |
2709 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
2710 | * If a cap get released before being added to the cap reconnect, | |
2711 | * __ceph_remove_cap() should skip queuing cap release. | |
2712 | */ | |
2713 | session->s_cap_reconnect = 1; | |
e01a5946 SW |
2714 | /* drop old cap expires; we're about to reestablish that state */ |
2715 | discard_cap_releases(mdsc, session); | |
99a9c273 | 2716 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 2717 | |
2f2dc053 | 2718 | /* traverse this session's caps */ |
44c99757 YZ |
2719 | s_nr_caps = session->s_nr_caps; |
2720 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
2721 | if (err) |
2722 | goto fail; | |
20cb34ae | 2723 | |
44c99757 | 2724 | recon_state.nr_caps = 0; |
20cb34ae SW |
2725 | recon_state.pagelist = pagelist; |
2726 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; | |
2727 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); | |
2f2dc053 | 2728 | if (err < 0) |
9abf82b8 | 2729 | goto fail; |
2f2dc053 | 2730 | |
99a9c273 YZ |
2731 | spin_lock(&session->s_cap_lock); |
2732 | session->s_cap_reconnect = 0; | |
2733 | spin_unlock(&session->s_cap_lock); | |
2734 | ||
2f2dc053 SW |
2735 | /* |
2736 | * snaprealms. we provide mds with the ino, seq (version), and | |
2737 | * parent for all of our realms. If the mds has any newer info, | |
2738 | * it will tell us. | |
2739 | */ | |
a105f00c SW |
2740 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2741 | struct ceph_snap_realm *realm = | |
2742 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2743 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2744 | |
2745 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2746 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2747 | sr_rec.ino = cpu_to_le64(realm->ino); |
2748 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2749 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2750 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2751 | if (err) | |
2752 | goto fail; | |
2f2dc053 | 2753 | } |
2f2dc053 | 2754 | |
20cb34ae SW |
2755 | if (recon_state.flock) |
2756 | reply->hdr.version = cpu_to_le16(2); | |
44c99757 YZ |
2757 | |
2758 | /* raced with cap release? */ | |
2759 | if (s_nr_caps != recon_state.nr_caps) { | |
2760 | struct page *page = list_first_entry(&pagelist->head, | |
2761 | struct page, lru); | |
2762 | __le32 *addr = kmap_atomic(page); | |
2763 | *addr = cpu_to_le32(recon_state.nr_caps); | |
2764 | kunmap_atomic(addr); | |
ebf18f47 | 2765 | } |
44c99757 YZ |
2766 | |
2767 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
2768 | ceph_msg_data_add_pagelist(reply, pagelist); | |
2f2dc053 SW |
2769 | ceph_con_send(&session->s_con, reply); |
2770 | ||
9abf82b8 SW |
2771 | mutex_unlock(&session->s_mutex); |
2772 | ||
2773 | mutex_lock(&mdsc->mutex); | |
2774 | __wake_requests(mdsc, &session->s_waiting); | |
2775 | mutex_unlock(&mdsc->mutex); | |
2776 | ||
2f2dc053 | 2777 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2778 | return; |
2779 | ||
93cea5be | 2780 | fail: |
2f2dc053 | 2781 | ceph_msg_put(reply); |
9abf82b8 SW |
2782 | up_read(&mdsc->snap_rwsem); |
2783 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
2784 | fail_nomsg: |
2785 | ceph_pagelist_release(pagelist); | |
2786 | kfree(pagelist); | |
2787 | fail_nopagelist: | |
9abf82b8 | 2788 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 2789 | return; |
2f2dc053 SW |
2790 | } |
2791 | ||
2792 | ||
2793 | /* | |
2794 | * compare old and new mdsmaps, kicking requests | |
2795 | * and closing out old connections as necessary | |
2796 | * | |
2797 | * called under mdsc->mutex. | |
2798 | */ | |
2799 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2800 | struct ceph_mdsmap *newmap, | |
2801 | struct ceph_mdsmap *oldmap) | |
2802 | { | |
2803 | int i; | |
2804 | int oldstate, newstate; | |
2805 | struct ceph_mds_session *s; | |
2806 | ||
2807 | dout("check_new_map new %u old %u\n", | |
2808 | newmap->m_epoch, oldmap->m_epoch); | |
2809 | ||
2810 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2811 | if (mdsc->sessions[i] == NULL) | |
2812 | continue; | |
2813 | s = mdsc->sessions[i]; | |
2814 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2815 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2816 | ||
0deb01c9 | 2817 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 2818 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 2819 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 2820 | ceph_mds_state_name(newstate), |
0deb01c9 | 2821 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
2f2dc053 SW |
2822 | session_state_name(s->s_state)); |
2823 | ||
3e8f43a0 YZ |
2824 | if (i >= newmap->m_max_mds || |
2825 | memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2f2dc053 SW |
2826 | ceph_mdsmap_get_addr(newmap, i), |
2827 | sizeof(struct ceph_entity_addr))) { | |
2828 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2829 | /* the session never opened, just close it | |
2830 | * out now */ | |
2831 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2832 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2833 | } else { |
2834 | /* just close it */ | |
2835 | mutex_unlock(&mdsc->mutex); | |
2836 | mutex_lock(&s->s_mutex); | |
2837 | mutex_lock(&mdsc->mutex); | |
2838 | ceph_con_close(&s->s_con); | |
2839 | mutex_unlock(&s->s_mutex); | |
2840 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2841 | } | |
2842 | ||
2843 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2844 | kick_requests(mdsc, i); |
2f2dc053 SW |
2845 | } else if (oldstate == newstate) { |
2846 | continue; /* nothing new with this mds */ | |
2847 | } | |
2848 | ||
2849 | /* | |
2850 | * send reconnect? | |
2851 | */ | |
2852 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
2853 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
2854 | mutex_unlock(&mdsc->mutex); | |
2855 | send_mds_reconnect(mdsc, s); | |
2856 | mutex_lock(&mdsc->mutex); | |
2857 | } | |
2f2dc053 SW |
2858 | |
2859 | /* | |
29790f26 | 2860 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2861 | */ |
2862 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2863 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2864 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2865 | oldstate != CEPH_MDS_STATE_STARTING) | |
2866 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2867 | kick_requests(mdsc, i); | |
2f2dc053 | 2868 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2869 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2870 | } |
2871 | } | |
cb170a22 SW |
2872 | |
2873 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2874 | s = mdsc->sessions[i]; | |
2875 | if (!s) | |
2876 | continue; | |
2877 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
2878 | continue; | |
2879 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
2880 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
2881 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2882 | dout(" connecting to export targets of laggy mds%d\n", | |
2883 | i); | |
2884 | __open_export_target_sessions(mdsc, s); | |
2885 | } | |
2886 | } | |
2f2dc053 SW |
2887 | } |
2888 | ||
2889 | ||
2890 | ||
2891 | /* | |
2892 | * leases | |
2893 | */ | |
2894 | ||
2895 | /* | |
2896 | * caller must hold session s_mutex, dentry->d_lock | |
2897 | */ | |
2898 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2899 | { | |
2900 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2901 | ||
2902 | ceph_put_mds_session(di->lease_session); | |
2903 | di->lease_session = NULL; | |
2904 | } | |
2905 | ||
2600d2dd SW |
2906 | static void handle_lease(struct ceph_mds_client *mdsc, |
2907 | struct ceph_mds_session *session, | |
2908 | struct ceph_msg *msg) | |
2f2dc053 | 2909 | { |
3d14c5d2 | 2910 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 2911 | struct inode *inode; |
2f2dc053 SW |
2912 | struct dentry *parent, *dentry; |
2913 | struct ceph_dentry_info *di; | |
2600d2dd | 2914 | int mds = session->s_mds; |
2f2dc053 | 2915 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 2916 | u32 seq; |
2f2dc053 | 2917 | struct ceph_vino vino; |
2f2dc053 SW |
2918 | struct qstr dname; |
2919 | int release = 0; | |
2920 | ||
2f2dc053 SW |
2921 | dout("handle_lease from mds%d\n", mds); |
2922 | ||
2923 | /* decode */ | |
2924 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
2925 | goto bad; | |
2926 | vino.ino = le64_to_cpu(h->ino); | |
2927 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 2928 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
2929 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
2930 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
2931 | if (dname.len != get_unaligned_le32(h+1)) | |
2932 | goto bad; | |
2933 | ||
2f2dc053 SW |
2934 | mutex_lock(&session->s_mutex); |
2935 | session->s_seq++; | |
2936 | ||
2937 | /* lookup inode */ | |
2938 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
2939 | dout("handle_lease %s, ino %llx %p %.*s\n", |
2940 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 2941 | dname.len, dname.name); |
2f2dc053 SW |
2942 | if (inode == NULL) { |
2943 | dout("handle_lease no inode %llx\n", vino.ino); | |
2944 | goto release; | |
2945 | } | |
2f2dc053 SW |
2946 | |
2947 | /* dentry */ | |
2948 | parent = d_find_alias(inode); | |
2949 | if (!parent) { | |
2950 | dout("no parent dentry on inode %p\n", inode); | |
2951 | WARN_ON(1); | |
2952 | goto release; /* hrm... */ | |
2953 | } | |
2954 | dname.hash = full_name_hash(dname.name, dname.len); | |
2955 | dentry = d_lookup(parent, &dname); | |
2956 | dput(parent); | |
2957 | if (!dentry) | |
2958 | goto release; | |
2959 | ||
2960 | spin_lock(&dentry->d_lock); | |
2961 | di = ceph_dentry(dentry); | |
2962 | switch (h->action) { | |
2963 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 2964 | if (di->lease_session == session) { |
1e5ea23d SW |
2965 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
2966 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
2967 | __ceph_mdsc_drop_dentry_lease(dentry); |
2968 | } | |
2969 | release = 1; | |
2970 | break; | |
2971 | ||
2972 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 2973 | if (di->lease_session == session && |
2f2dc053 SW |
2974 | di->lease_gen == session->s_cap_gen && |
2975 | di->lease_renew_from && | |
2976 | di->lease_renew_after == 0) { | |
2977 | unsigned long duration = | |
2978 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
2979 | ||
1e5ea23d | 2980 | di->lease_seq = seq; |
2f2dc053 SW |
2981 | dentry->d_time = di->lease_renew_from + duration; |
2982 | di->lease_renew_after = di->lease_renew_from + | |
2983 | (duration >> 1); | |
2984 | di->lease_renew_from = 0; | |
2985 | } | |
2986 | break; | |
2987 | } | |
2988 | spin_unlock(&dentry->d_lock); | |
2989 | dput(dentry); | |
2990 | ||
2991 | if (!release) | |
2992 | goto out; | |
2993 | ||
2994 | release: | |
2995 | /* let's just reuse the same message */ | |
2996 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
2997 | ceph_msg_get(msg); | |
2998 | ceph_con_send(&session->s_con, msg); | |
2999 | ||
3000 | out: | |
3001 | iput(inode); | |
3002 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
3003 | return; |
3004 | ||
3005 | bad: | |
3006 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 3007 | ceph_msg_dump(msg); |
2f2dc053 SW |
3008 | } |
3009 | ||
3010 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
3011 | struct inode *inode, | |
3012 | struct dentry *dentry, char action, | |
3013 | u32 seq) | |
3014 | { | |
3015 | struct ceph_msg *msg; | |
3016 | struct ceph_mds_lease *lease; | |
3017 | int len = sizeof(*lease) + sizeof(u32); | |
3018 | int dnamelen = 0; | |
3019 | ||
3020 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
3021 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
3022 | dnamelen = dentry->d_name.len; | |
3023 | len += dnamelen; | |
3024 | ||
b61c2763 | 3025 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 3026 | if (!msg) |
2f2dc053 SW |
3027 | return; |
3028 | lease = msg->front.iov_base; | |
3029 | lease->action = action; | |
2f2dc053 SW |
3030 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
3031 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
3032 | lease->seq = cpu_to_le32(seq); | |
3033 | put_unaligned_le32(dnamelen, lease + 1); | |
3034 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
3035 | ||
3036 | /* | |
3037 | * if this is a preemptive lease RELEASE, no need to | |
3038 | * flush request stream, since the actual request will | |
3039 | * soon follow. | |
3040 | */ | |
3041 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
3042 | ||
3043 | ceph_con_send(&session->s_con, msg); | |
3044 | } | |
3045 | ||
3046 | /* | |
3047 | * Preemptively release a lease we expect to invalidate anyway. | |
3048 | * Pass @inode always, @dentry is optional. | |
3049 | */ | |
3050 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2f90b852 | 3051 | struct dentry *dentry) |
2f2dc053 SW |
3052 | { |
3053 | struct ceph_dentry_info *di; | |
3054 | struct ceph_mds_session *session; | |
3055 | u32 seq; | |
3056 | ||
3057 | BUG_ON(inode == NULL); | |
3058 | BUG_ON(dentry == NULL); | |
2f2dc053 SW |
3059 | |
3060 | /* is dentry lease valid? */ | |
3061 | spin_lock(&dentry->d_lock); | |
3062 | di = ceph_dentry(dentry); | |
3063 | if (!di || !di->lease_session || | |
3064 | di->lease_session->s_mds < 0 || | |
3065 | di->lease_gen != di->lease_session->s_cap_gen || | |
3066 | !time_before(jiffies, dentry->d_time)) { | |
3067 | dout("lease_release inode %p dentry %p -- " | |
2f90b852 SW |
3068 | "no lease\n", |
3069 | inode, dentry); | |
2f2dc053 SW |
3070 | spin_unlock(&dentry->d_lock); |
3071 | return; | |
3072 | } | |
3073 | ||
3074 | /* we do have a lease on this dentry; note mds and seq */ | |
3075 | session = ceph_get_mds_session(di->lease_session); | |
3076 | seq = di->lease_seq; | |
3077 | __ceph_mdsc_drop_dentry_lease(dentry); | |
3078 | spin_unlock(&dentry->d_lock); | |
3079 | ||
2f90b852 SW |
3080 | dout("lease_release inode %p dentry %p to mds%d\n", |
3081 | inode, dentry, session->s_mds); | |
2f2dc053 SW |
3082 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
3083 | CEPH_MDS_LEASE_RELEASE, seq); | |
3084 | ceph_put_mds_session(session); | |
3085 | } | |
3086 | ||
3087 | /* | |
3088 | * drop all leases (and dentry refs) in preparation for umount | |
3089 | */ | |
3090 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3091 | { | |
3092 | int i; | |
3093 | ||
3094 | dout("drop_leases\n"); | |
3095 | mutex_lock(&mdsc->mutex); | |
3096 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3097 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3098 | if (!s) | |
3099 | continue; | |
3100 | mutex_unlock(&mdsc->mutex); | |
3101 | mutex_lock(&s->s_mutex); | |
3102 | mutex_unlock(&s->s_mutex); | |
3103 | ceph_put_mds_session(s); | |
3104 | mutex_lock(&mdsc->mutex); | |
3105 | } | |
3106 | mutex_unlock(&mdsc->mutex); | |
3107 | } | |
3108 | ||
3109 | ||
3110 | ||
3111 | /* | |
3112 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3113 | */ | |
3114 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3115 | { | |
3116 | int delay = 5; | |
3117 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3118 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3119 | } | |
3120 | ||
3121 | static void delayed_work(struct work_struct *work) | |
3122 | { | |
3123 | int i; | |
3124 | struct ceph_mds_client *mdsc = | |
3125 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3126 | int renew_interval; | |
3127 | int renew_caps; | |
3128 | ||
3129 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3130 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3131 | |
3132 | mutex_lock(&mdsc->mutex); | |
3133 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3134 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3135 | mdsc->last_renew_caps); | |
3136 | if (renew_caps) | |
3137 | mdsc->last_renew_caps = jiffies; | |
3138 | ||
3139 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3140 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3141 | if (s == NULL) | |
3142 | continue; | |
3143 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3144 | dout("resending session close request for mds%d\n", | |
3145 | s->s_mds); | |
3146 | request_close_session(mdsc, s); | |
3147 | ceph_put_mds_session(s); | |
3148 | continue; | |
3149 | } | |
3150 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3151 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3152 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3153 | pr_info("mds%d hung\n", s->s_mds); | |
3154 | } | |
3155 | } | |
3156 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3157 | /* this mds is failed or recovering, just wait */ | |
3158 | ceph_put_mds_session(s); | |
3159 | continue; | |
3160 | } | |
3161 | mutex_unlock(&mdsc->mutex); | |
3162 | ||
3163 | mutex_lock(&s->s_mutex); | |
3164 | if (renew_caps) | |
3165 | send_renew_caps(mdsc, s); | |
3166 | else | |
3167 | ceph_con_keepalive(&s->s_con); | |
ee6b272b | 3168 | ceph_add_cap_releases(mdsc, s); |
aab53dd9 SW |
3169 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3170 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3171 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3172 | mutex_unlock(&s->s_mutex); |
3173 | ceph_put_mds_session(s); | |
3174 | ||
3175 | mutex_lock(&mdsc->mutex); | |
3176 | } | |
3177 | mutex_unlock(&mdsc->mutex); | |
3178 | ||
3179 | schedule_delayed(mdsc); | |
3180 | } | |
3181 | ||
3d14c5d2 | 3182 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3183 | |
2f2dc053 | 3184 | { |
3d14c5d2 YS |
3185 | struct ceph_mds_client *mdsc; |
3186 | ||
3187 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3188 | if (!mdsc) | |
3189 | return -ENOMEM; | |
3190 | mdsc->fsc = fsc; | |
3191 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3192 | mutex_init(&mdsc->mutex); |
3193 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
fb3101b6 | 3194 | if (mdsc->mdsmap == NULL) { |
3195 | kfree(mdsc); | |
2d06eeb8 | 3196 | return -ENOMEM; |
fb3101b6 | 3197 | } |
2d06eeb8 | 3198 | |
2f2dc053 | 3199 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3200 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3201 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3202 | mdsc->sessions = NULL; | |
3203 | mdsc->max_sessions = 0; | |
3204 | mdsc->stopping = 0; | |
3205 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 3206 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3207 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3208 | spin_lock_init(&mdsc->snap_empty_lock); | |
3209 | mdsc->last_tid = 0; | |
44ca18f2 | 3210 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3211 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3212 | mdsc->last_renew_caps = jiffies; | |
3213 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3214 | spin_lock_init(&mdsc->cap_delay_lock); | |
3215 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3216 | spin_lock_init(&mdsc->snap_flush_lock); | |
3217 | mdsc->cap_flush_seq = 0; | |
3218 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
db354052 | 3219 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3220 | mdsc->num_cap_flushing = 0; |
3221 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3222 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3223 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3224 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3225 | |
37151668 | 3226 | ceph_caps_init(mdsc); |
3d14c5d2 | 3227 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3228 | |
5f44f142 | 3229 | return 0; |
2f2dc053 SW |
3230 | } |
3231 | ||
3232 | /* | |
3233 | * Wait for safe replies on open mds requests. If we time out, drop | |
3234 | * all requests from the tree to avoid dangling dentry refs. | |
3235 | */ | |
3236 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3237 | { | |
3238 | struct ceph_mds_request *req; | |
3d14c5d2 | 3239 | struct ceph_fs_client *fsc = mdsc->fsc; |
2f2dc053 SW |
3240 | |
3241 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3242 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3243 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3244 | |
2f2dc053 SW |
3245 | dout("wait_requests waiting for requests\n"); |
3246 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
3d14c5d2 | 3247 | fsc->client->options->mount_timeout * HZ); |
2f2dc053 SW |
3248 | |
3249 | /* tear down remaining requests */ | |
44ca18f2 SW |
3250 | mutex_lock(&mdsc->mutex); |
3251 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3252 | dout("wait_requests timed out on tid %llu\n", |
3253 | req->r_tid); | |
44ca18f2 | 3254 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3255 | } |
3256 | } | |
3257 | mutex_unlock(&mdsc->mutex); | |
3258 | dout("wait_requests done\n"); | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * called before mount is ro, and before dentries are torn down. | |
3263 | * (hmm, does this still race with new lookups?) | |
3264 | */ | |
3265 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3266 | { | |
3267 | dout("pre_umount\n"); | |
3268 | mdsc->stopping = 1; | |
3269 | ||
3270 | drop_leases(mdsc); | |
afcdaea3 | 3271 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3272 | wait_requests(mdsc); |
17c688c3 SW |
3273 | |
3274 | /* | |
3275 | * wait for reply handlers to drop their request refs and | |
3276 | * their inode/dcache refs | |
3277 | */ | |
3278 | ceph_msgr_flush(); | |
2f2dc053 SW |
3279 | } |
3280 | ||
3281 | /* | |
3282 | * wait for all write mds requests to flush. | |
3283 | */ | |
3284 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3285 | { | |
80fc7314 | 3286 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3287 | struct rb_node *n; |
2f2dc053 SW |
3288 | |
3289 | mutex_lock(&mdsc->mutex); | |
3290 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3291 | restart: |
44ca18f2 SW |
3292 | req = __get_oldest_req(mdsc); |
3293 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3294 | /* find next request */ |
3295 | n = rb_next(&req->r_node); | |
3296 | if (n) | |
3297 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3298 | else | |
3299 | nextreq = NULL; | |
44ca18f2 SW |
3300 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
3301 | /* write op */ | |
3302 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3303 | if (nextreq) |
3304 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3305 | mutex_unlock(&mdsc->mutex); |
3306 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3307 | req->r_tid, want_tid); | |
3308 | wait_for_completion(&req->r_safe_completion); | |
3309 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3310 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3311 | if (!nextreq) |
3312 | break; /* next dne before, so we're done! */ | |
3313 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3314 | /* next request was removed from tree */ | |
3315 | ceph_mdsc_put_request(nextreq); | |
3316 | goto restart; | |
3317 | } | |
3318 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3319 | } |
80fc7314 | 3320 | req = nextreq; |
2f2dc053 SW |
3321 | } |
3322 | mutex_unlock(&mdsc->mutex); | |
3323 | dout("wait_unsafe_requests done\n"); | |
3324 | } | |
3325 | ||
3326 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3327 | { | |
3328 | u64 want_tid, want_flush; | |
3329 | ||
3d14c5d2 | 3330 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3331 | return; |
3332 | ||
2f2dc053 SW |
3333 | dout("sync\n"); |
3334 | mutex_lock(&mdsc->mutex); | |
3335 | want_tid = mdsc->last_tid; | |
3336 | want_flush = mdsc->cap_flush_seq; | |
3337 | mutex_unlock(&mdsc->mutex); | |
3338 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
3339 | ||
afcdaea3 | 3340 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
3341 | |
3342 | wait_unsafe_requests(mdsc, want_tid); | |
3343 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
3344 | } | |
3345 | ||
f3c60c59 SW |
3346 | /* |
3347 | * true if all sessions are closed, or we force unmount | |
3348 | */ | |
7fd7d101 | 3349 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
f3c60c59 SW |
3350 | { |
3351 | int i, n = 0; | |
3352 | ||
3d14c5d2 | 3353 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 SW |
3354 | return true; |
3355 | ||
3356 | mutex_lock(&mdsc->mutex); | |
3357 | for (i = 0; i < mdsc->max_sessions; i++) | |
3358 | if (mdsc->sessions[i]) | |
3359 | n++; | |
3360 | mutex_unlock(&mdsc->mutex); | |
3361 | return n == 0; | |
3362 | } | |
2f2dc053 SW |
3363 | |
3364 | /* | |
3365 | * called after sb is ro. | |
3366 | */ | |
3367 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3368 | { | |
3369 | struct ceph_mds_session *session; | |
3370 | int i; | |
3d14c5d2 YS |
3371 | struct ceph_fs_client *fsc = mdsc->fsc; |
3372 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; | |
2f2dc053 SW |
3373 | |
3374 | dout("close_sessions\n"); | |
3375 | ||
2f2dc053 | 3376 | /* close sessions */ |
f3c60c59 SW |
3377 | mutex_lock(&mdsc->mutex); |
3378 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3379 | session = __ceph_lookup_mds_session(mdsc, i); | |
3380 | if (!session) | |
3381 | continue; | |
2f2dc053 | 3382 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3383 | mutex_lock(&session->s_mutex); |
3384 | __close_session(mdsc, session); | |
3385 | mutex_unlock(&session->s_mutex); | |
3386 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3387 | mutex_lock(&mdsc->mutex); |
3388 | } | |
f3c60c59 SW |
3389 | mutex_unlock(&mdsc->mutex); |
3390 | ||
3391 | dout("waiting for sessions to close\n"); | |
3392 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
3393 | timeout); | |
2f2dc053 SW |
3394 | |
3395 | /* tear down remaining sessions */ | |
f3c60c59 | 3396 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3397 | for (i = 0; i < mdsc->max_sessions; i++) { |
3398 | if (mdsc->sessions[i]) { | |
3399 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3400 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3401 | mutex_unlock(&mdsc->mutex); |
3402 | mutex_lock(&session->s_mutex); | |
3403 | remove_session_caps(session); | |
3404 | mutex_unlock(&session->s_mutex); | |
3405 | ceph_put_mds_session(session); | |
3406 | mutex_lock(&mdsc->mutex); | |
3407 | } | |
3408 | } | |
2f2dc053 | 3409 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3410 | mutex_unlock(&mdsc->mutex); |
3411 | ||
3412 | ceph_cleanup_empty_realms(mdsc); | |
3413 | ||
3414 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3415 | ||
3416 | dout("stopped\n"); | |
3417 | } | |
3418 | ||
3d14c5d2 | 3419 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3420 | { |
3421 | dout("stop\n"); | |
3422 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3423 | if (mdsc->mdsmap) | |
3424 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3425 | kfree(mdsc->sessions); | |
37151668 | 3426 | ceph_caps_finalize(mdsc); |
2f2dc053 SW |
3427 | } |
3428 | ||
3d14c5d2 YS |
3429 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3430 | { | |
3431 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3432 | ||
ef550f6f | 3433 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3434 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3435 | |
3436 | /* flush out any connection work with references to us */ | |
3437 | ceph_msgr_flush(); | |
3438 | ||
3d14c5d2 YS |
3439 | fsc->mdsc = NULL; |
3440 | kfree(mdsc); | |
ef550f6f | 3441 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3442 | } |
3443 | ||
2f2dc053 SW |
3444 | |
3445 | /* | |
3446 | * handle mds map update. | |
3447 | */ | |
3448 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
3449 | { | |
3450 | u32 epoch; | |
3451 | u32 maplen; | |
3452 | void *p = msg->front.iov_base; | |
3453 | void *end = p + msg->front.iov_len; | |
3454 | struct ceph_mdsmap *newmap, *oldmap; | |
3455 | struct ceph_fsid fsid; | |
3456 | int err = -EINVAL; | |
3457 | ||
3458 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3459 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3460 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3461 | return; |
c89136ea SW |
3462 | epoch = ceph_decode_32(&p); |
3463 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3464 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3465 | ||
3466 | /* do we need it? */ | |
3d14c5d2 | 3467 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
2f2dc053 SW |
3468 | mutex_lock(&mdsc->mutex); |
3469 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3470 | dout("handle_map epoch %u <= our %u\n", | |
3471 | epoch, mdsc->mdsmap->m_epoch); | |
3472 | mutex_unlock(&mdsc->mutex); | |
3473 | return; | |
3474 | } | |
3475 | ||
3476 | newmap = ceph_mdsmap_decode(&p, end); | |
3477 | if (IS_ERR(newmap)) { | |
3478 | err = PTR_ERR(newmap); | |
3479 | goto bad_unlock; | |
3480 | } | |
3481 | ||
3482 | /* swap into place */ | |
3483 | if (mdsc->mdsmap) { | |
3484 | oldmap = mdsc->mdsmap; | |
3485 | mdsc->mdsmap = newmap; | |
3486 | check_new_map(mdsc, newmap, oldmap); | |
3487 | ceph_mdsmap_destroy(oldmap); | |
3488 | } else { | |
3489 | mdsc->mdsmap = newmap; /* first mds map */ | |
3490 | } | |
3d14c5d2 | 3491 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3492 | |
3493 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3494 | ||
3495 | mutex_unlock(&mdsc->mutex); | |
3496 | schedule_delayed(mdsc); | |
3497 | return; | |
3498 | ||
3499 | bad_unlock: | |
3500 | mutex_unlock(&mdsc->mutex); | |
3501 | bad: | |
3502 | pr_err("error decoding mdsmap %d\n", err); | |
3503 | return; | |
3504 | } | |
3505 | ||
3506 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3507 | { | |
3508 | struct ceph_mds_session *s = con->private; | |
3509 | ||
3510 | if (get_session(s)) { | |
2600d2dd | 3511 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3512 | return con; |
3513 | } | |
3514 | dout("mdsc con_get %p FAIL\n", s); | |
3515 | return NULL; | |
3516 | } | |
3517 | ||
3518 | static void con_put(struct ceph_connection *con) | |
3519 | { | |
3520 | struct ceph_mds_session *s = con->private; | |
3521 | ||
7d8e18a6 | 3522 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3523 | ceph_put_mds_session(s); |
3524 | } | |
3525 | ||
3526 | /* | |
3527 | * if the client is unresponsive for long enough, the mds will kill | |
3528 | * the session entirely. | |
3529 | */ | |
3530 | static void peer_reset(struct ceph_connection *con) | |
3531 | { | |
3532 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3533 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3534 | |
f3ae1b97 | 3535 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 3536 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
3537 | } |
3538 | ||
3539 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3540 | { | |
3541 | struct ceph_mds_session *s = con->private; | |
3542 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3543 | int type = le16_to_cpu(msg->hdr.type); | |
3544 | ||
2600d2dd SW |
3545 | mutex_lock(&mdsc->mutex); |
3546 | if (__verify_registered_session(mdsc, s) < 0) { | |
3547 | mutex_unlock(&mdsc->mutex); | |
3548 | goto out; | |
3549 | } | |
3550 | mutex_unlock(&mdsc->mutex); | |
3551 | ||
2f2dc053 SW |
3552 | switch (type) { |
3553 | case CEPH_MSG_MDS_MAP: | |
3554 | ceph_mdsc_handle_map(mdsc, msg); | |
3555 | break; | |
3556 | case CEPH_MSG_CLIENT_SESSION: | |
3557 | handle_session(s, msg); | |
3558 | break; | |
3559 | case CEPH_MSG_CLIENT_REPLY: | |
3560 | handle_reply(s, msg); | |
3561 | break; | |
3562 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3563 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3564 | break; |
3565 | case CEPH_MSG_CLIENT_CAPS: | |
3566 | ceph_handle_caps(s, msg); | |
3567 | break; | |
3568 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3569 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3570 | break; |
3571 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3572 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3573 | break; |
3574 | ||
3575 | default: | |
3576 | pr_err("received unknown message type %d %s\n", type, | |
3577 | ceph_msg_type_name(type)); | |
3578 | } | |
2600d2dd | 3579 | out: |
2f2dc053 SW |
3580 | ceph_msg_put(msg); |
3581 | } | |
3582 | ||
4e7a5dcd SW |
3583 | /* |
3584 | * authentication | |
3585 | */ | |
a3530df3 AE |
3586 | |
3587 | /* | |
3588 | * Note: returned pointer is the address of a structure that's | |
3589 | * managed separately. Caller must *not* attempt to free it. | |
3590 | */ | |
3591 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 3592 | int *proto, int force_new) |
4e7a5dcd SW |
3593 | { |
3594 | struct ceph_mds_session *s = con->private; | |
3595 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3596 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 3597 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 3598 | |
74f1869f | 3599 | if (force_new && auth->authorizer) { |
27859f97 | 3600 | ceph_auth_destroy_authorizer(ac, auth->authorizer); |
74f1869f | 3601 | auth->authorizer = NULL; |
4e7a5dcd | 3602 | } |
27859f97 SW |
3603 | if (!auth->authorizer) { |
3604 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3605 | auth); | |
0bed9b5c SW |
3606 | if (ret) |
3607 | return ERR_PTR(ret); | |
27859f97 SW |
3608 | } else { |
3609 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3610 | auth); | |
a255651d | 3611 | if (ret) |
a3530df3 | 3612 | return ERR_PTR(ret); |
4e7a5dcd | 3613 | } |
4e7a5dcd | 3614 | *proto = ac->protocol; |
74f1869f | 3615 | |
a3530df3 | 3616 | return auth; |
4e7a5dcd SW |
3617 | } |
3618 | ||
3619 | ||
3620 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3621 | { | |
3622 | struct ceph_mds_session *s = con->private; | |
3623 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3624 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 3625 | |
27859f97 | 3626 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); |
4e7a5dcd SW |
3627 | } |
3628 | ||
9bd2e6f8 SW |
3629 | static int invalidate_authorizer(struct ceph_connection *con) |
3630 | { | |
3631 | struct ceph_mds_session *s = con->private; | |
3632 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3633 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 3634 | |
27859f97 | 3635 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 3636 | |
3d14c5d2 | 3637 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3638 | } |
3639 | ||
53ded495 AE |
3640 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
3641 | struct ceph_msg_header *hdr, int *skip) | |
3642 | { | |
3643 | struct ceph_msg *msg; | |
3644 | int type = (int) le16_to_cpu(hdr->type); | |
3645 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
3646 | ||
3647 | if (con->in_msg) | |
3648 | return con->in_msg; | |
3649 | ||
3650 | *skip = 0; | |
3651 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
3652 | if (!msg) { | |
3653 | pr_err("unable to allocate msg type %d len %d\n", | |
3654 | type, front_len); | |
3655 | return NULL; | |
3656 | } | |
53ded495 AE |
3657 | |
3658 | return msg; | |
3659 | } | |
3660 | ||
9e32789f | 3661 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3662 | .get = con_get, |
3663 | .put = con_put, | |
3664 | .dispatch = dispatch, | |
4e7a5dcd SW |
3665 | .get_authorizer = get_authorizer, |
3666 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3667 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3668 | .peer_reset = peer_reset, |
53ded495 | 3669 | .alloc_msg = mds_alloc_msg, |
2f2dc053 SW |
3670 | }; |
3671 | ||
2f2dc053 | 3672 | /* eof */ |