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Commit | Line | Data |
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3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 | 2 | |
496e5955 | 3 | #include <linux/fs.h> |
2f2dc053 | 4 | #include <linux/wait.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
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> | |
dbd0c8bf | 10 | #include <linux/utsname.h> |
2f2dc053 | 11 | |
2f2dc053 | 12 | #include "super.h" |
3d14c5d2 YS |
13 | #include "mds_client.h" |
14 | ||
1fe60e51 | 15 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
16 | #include <linux/ceph/messenger.h> |
17 | #include <linux/ceph/decode.h> | |
18 | #include <linux/ceph/pagelist.h> | |
19 | #include <linux/ceph/auth.h> | |
20 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
21 | |
22 | /* | |
23 | * A cluster of MDS (metadata server) daemons is responsible for | |
24 | * managing the file system namespace (the directory hierarchy and | |
25 | * inodes) and for coordinating shared access to storage. Metadata is | |
26 | * partitioning hierarchically across a number of servers, and that | |
27 | * partition varies over time as the cluster adjusts the distribution | |
28 | * in order to balance load. | |
29 | * | |
30 | * The MDS client is primarily responsible to managing synchronous | |
31 | * metadata requests for operations like open, unlink, and so forth. | |
32 | * If there is a MDS failure, we find out about it when we (possibly | |
33 | * request and) receive a new MDS map, and can resubmit affected | |
34 | * requests. | |
35 | * | |
36 | * For the most part, though, we take advantage of a lossless | |
37 | * communications channel to the MDS, and do not need to worry about | |
38 | * timing out or resubmitting requests. | |
39 | * | |
40 | * We maintain a stateful "session" with each MDS we interact with. | |
41 | * Within each session, we sent periodic heartbeat messages to ensure | |
42 | * any capabilities or leases we have been issues remain valid. If | |
43 | * the session times out and goes stale, our leases and capabilities | |
44 | * are no longer valid. | |
45 | */ | |
46 | ||
20cb34ae | 47 | struct ceph_reconnect_state { |
44c99757 | 48 | int nr_caps; |
20cb34ae SW |
49 | struct ceph_pagelist *pagelist; |
50 | bool flock; | |
51 | }; | |
52 | ||
2f2dc053 SW |
53 | static void __wake_requests(struct ceph_mds_client *mdsc, |
54 | struct list_head *head); | |
55 | ||
9e32789f | 56 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
57 | |
58 | ||
59 | /* | |
60 | * mds reply parsing | |
61 | */ | |
62 | ||
63 | /* | |
64 | * parse individual inode info | |
65 | */ | |
66 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 67 | struct ceph_mds_reply_info_in *info, |
12b4629a | 68 | u64 features) |
2f2dc053 SW |
69 | { |
70 | int err = -EIO; | |
71 | ||
72 | info->in = *p; | |
73 | *p += sizeof(struct ceph_mds_reply_inode) + | |
74 | sizeof(*info->in->fragtree.splits) * | |
75 | le32_to_cpu(info->in->fragtree.nsplits); | |
76 | ||
77 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
78 | ceph_decode_need(p, end, info->symlink_len, bad); | |
79 | info->symlink = *p; | |
80 | *p += info->symlink_len; | |
81 | ||
14303d20 SW |
82 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
83 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
84 | sizeof(info->dir_layout), bad); | |
85 | else | |
86 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
87 | ||
2f2dc053 SW |
88 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
89 | ceph_decode_need(p, end, info->xattr_len, bad); | |
90 | info->xattr_data = *p; | |
91 | *p += info->xattr_len; | |
92 | return 0; | |
93 | bad: | |
94 | return err; | |
95 | } | |
96 | ||
97 | /* | |
98 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
99 | * target inode. | |
100 | */ | |
101 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 102 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 103 | u64 features) |
2f2dc053 SW |
104 | { |
105 | int err; | |
106 | ||
107 | if (info->head->is_dentry) { | |
14303d20 | 108 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
109 | if (err < 0) |
110 | goto out_bad; | |
111 | ||
112 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
113 | goto bad; | |
114 | info->dirfrag = *p; | |
115 | *p += sizeof(*info->dirfrag) + | |
116 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
117 | if (unlikely(*p > end)) | |
118 | goto bad; | |
119 | ||
120 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
121 | ceph_decode_need(p, end, info->dname_len, bad); | |
122 | info->dname = *p; | |
123 | *p += info->dname_len; | |
124 | info->dlease = *p; | |
125 | *p += sizeof(*info->dlease); | |
126 | } | |
127 | ||
128 | if (info->head->is_target) { | |
14303d20 | 129 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
130 | if (err < 0) |
131 | goto out_bad; | |
132 | } | |
133 | ||
134 | if (unlikely(*p != end)) | |
135 | goto bad; | |
136 | return 0; | |
137 | ||
138 | bad: | |
139 | err = -EIO; | |
140 | out_bad: | |
141 | pr_err("problem parsing mds trace %d\n", err); | |
142 | return err; | |
143 | } | |
144 | ||
145 | /* | |
146 | * parse readdir results | |
147 | */ | |
148 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 149 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 150 | u64 features) |
2f2dc053 SW |
151 | { |
152 | u32 num, i = 0; | |
153 | int err; | |
154 | ||
155 | info->dir_dir = *p; | |
156 | if (*p + sizeof(*info->dir_dir) > end) | |
157 | goto bad; | |
158 | *p += sizeof(*info->dir_dir) + | |
159 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
160 | if (*p > end) | |
161 | goto bad; | |
162 | ||
163 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
164 | num = ceph_decode_32(p); |
165 | info->dir_end = ceph_decode_8(p); | |
166 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
167 | if (num == 0) |
168 | goto done; | |
169 | ||
54008399 | 170 | BUG_ON(!info->dir_in); |
2f2dc053 SW |
171 | info->dir_dname = (void *)(info->dir_in + num); |
172 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
173 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
54008399 YZ |
174 | if ((unsigned long)(info->dir_dlease + num) > |
175 | (unsigned long)info->dir_in + info->dir_buf_size) { | |
176 | pr_err("dir contents are larger than expected\n"); | |
177 | WARN_ON(1); | |
178 | goto bad; | |
179 | } | |
2f2dc053 | 180 | |
54008399 | 181 | info->dir_nr = num; |
2f2dc053 SW |
182 | while (num) { |
183 | /* dentry */ | |
184 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 185 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
186 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
187 | info->dir_dname[i] = *p; | |
188 | *p += info->dir_dname_len[i]; | |
189 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
190 | info->dir_dname[i]); | |
191 | info->dir_dlease[i] = *p; | |
192 | *p += sizeof(struct ceph_mds_reply_lease); | |
193 | ||
194 | /* inode */ | |
14303d20 | 195 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
2f2dc053 SW |
196 | if (err < 0) |
197 | goto out_bad; | |
198 | i++; | |
199 | num--; | |
200 | } | |
201 | ||
202 | done: | |
203 | if (*p != end) | |
204 | goto bad; | |
205 | return 0; | |
206 | ||
207 | bad: | |
208 | err = -EIO; | |
209 | out_bad: | |
210 | pr_err("problem parsing dir contents %d\n", err); | |
211 | return err; | |
212 | } | |
213 | ||
25933abd HS |
214 | /* |
215 | * parse fcntl F_GETLK results | |
216 | */ | |
217 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 218 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 219 | u64 features) |
25933abd HS |
220 | { |
221 | if (*p + sizeof(*info->filelock_reply) > end) | |
222 | goto bad; | |
223 | ||
224 | info->filelock_reply = *p; | |
225 | *p += sizeof(*info->filelock_reply); | |
226 | ||
227 | if (unlikely(*p != end)) | |
228 | goto bad; | |
229 | return 0; | |
230 | ||
231 | bad: | |
232 | return -EIO; | |
233 | } | |
234 | ||
6e8575fa SL |
235 | /* |
236 | * parse create results | |
237 | */ | |
238 | static int parse_reply_info_create(void **p, void *end, | |
239 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 240 | u64 features) |
6e8575fa SL |
241 | { |
242 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
243 | if (*p == end) { | |
244 | info->has_create_ino = false; | |
245 | } else { | |
246 | info->has_create_ino = true; | |
247 | info->ino = ceph_decode_64(p); | |
248 | } | |
249 | } | |
250 | ||
251 | if (unlikely(*p != end)) | |
252 | goto bad; | |
253 | return 0; | |
254 | ||
255 | bad: | |
256 | return -EIO; | |
257 | } | |
258 | ||
25933abd HS |
259 | /* |
260 | * parse extra results | |
261 | */ | |
262 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 263 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 264 | u64 features) |
25933abd HS |
265 | { |
266 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 267 | return parse_reply_info_filelock(p, end, info, features); |
8a034497 YZ |
268 | else if (info->head->op == CEPH_MDS_OP_READDIR || |
269 | info->head->op == CEPH_MDS_OP_LSSNAP) | |
14303d20 | 270 | return parse_reply_info_dir(p, end, info, features); |
6e8575fa SL |
271 | else if (info->head->op == CEPH_MDS_OP_CREATE) |
272 | return parse_reply_info_create(p, end, info, features); | |
273 | else | |
274 | return -EIO; | |
25933abd HS |
275 | } |
276 | ||
2f2dc053 SW |
277 | /* |
278 | * parse entire mds reply | |
279 | */ | |
280 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 281 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 282 | u64 features) |
2f2dc053 SW |
283 | { |
284 | void *p, *end; | |
285 | u32 len; | |
286 | int err; | |
287 | ||
288 | info->head = msg->front.iov_base; | |
289 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
290 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
291 | ||
292 | /* trace */ | |
293 | ceph_decode_32_safe(&p, end, len, bad); | |
294 | if (len > 0) { | |
32852a81 | 295 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 296 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
297 | if (err < 0) |
298 | goto out_bad; | |
299 | } | |
300 | ||
25933abd | 301 | /* extra */ |
2f2dc053 SW |
302 | ceph_decode_32_safe(&p, end, len, bad); |
303 | if (len > 0) { | |
32852a81 | 304 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 305 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
306 | if (err < 0) |
307 | goto out_bad; | |
308 | } | |
309 | ||
310 | /* snap blob */ | |
311 | ceph_decode_32_safe(&p, end, len, bad); | |
312 | info->snapblob_len = len; | |
313 | info->snapblob = p; | |
314 | p += len; | |
315 | ||
316 | if (p != end) | |
317 | goto bad; | |
318 | return 0; | |
319 | ||
320 | bad: | |
321 | err = -EIO; | |
322 | out_bad: | |
323 | pr_err("mds parse_reply err %d\n", err); | |
324 | return err; | |
325 | } | |
326 | ||
327 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
328 | { | |
54008399 YZ |
329 | if (!info->dir_in) |
330 | return; | |
331 | free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size)); | |
2f2dc053 SW |
332 | } |
333 | ||
334 | ||
335 | /* | |
336 | * sessions | |
337 | */ | |
a687ecaf | 338 | const char *ceph_session_state_name(int s) |
2f2dc053 SW |
339 | { |
340 | switch (s) { | |
341 | case CEPH_MDS_SESSION_NEW: return "new"; | |
342 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
343 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
344 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
345 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 346 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
347 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
348 | default: return "???"; | |
349 | } | |
350 | } | |
351 | ||
352 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
353 | { | |
354 | if (atomic_inc_not_zero(&s->s_ref)) { | |
355 | dout("mdsc get_session %p %d -> %d\n", s, | |
356 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
357 | return s; | |
358 | } else { | |
359 | dout("mdsc get_session %p 0 -- FAIL", s); | |
360 | return NULL; | |
361 | } | |
362 | } | |
363 | ||
364 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
365 | { | |
366 | dout("mdsc put_session %p %d -> %d\n", s, | |
367 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd | 368 | if (atomic_dec_and_test(&s->s_ref)) { |
6c4a1915 | 369 | if (s->s_auth.authorizer) |
27859f97 SW |
370 | ceph_auth_destroy_authorizer( |
371 | s->s_mdsc->fsc->client->monc.auth, | |
372 | s->s_auth.authorizer); | |
2f2dc053 | 373 | kfree(s); |
4e7a5dcd | 374 | } |
2f2dc053 SW |
375 | } |
376 | ||
377 | /* | |
378 | * called under mdsc->mutex | |
379 | */ | |
380 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
381 | int mds) | |
382 | { | |
383 | struct ceph_mds_session *session; | |
384 | ||
385 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
386 | return NULL; | |
387 | session = mdsc->sessions[mds]; | |
388 | dout("lookup_mds_session %p %d\n", session, | |
389 | atomic_read(&session->s_ref)); | |
390 | get_session(session); | |
391 | return session; | |
392 | } | |
393 | ||
394 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
395 | { | |
396 | if (mds >= mdsc->max_sessions) | |
397 | return false; | |
398 | return mdsc->sessions[mds]; | |
399 | } | |
400 | ||
2600d2dd SW |
401 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
402 | struct ceph_mds_session *s) | |
403 | { | |
404 | if (s->s_mds >= mdsc->max_sessions || | |
405 | mdsc->sessions[s->s_mds] != s) | |
406 | return -ENOENT; | |
407 | return 0; | |
408 | } | |
409 | ||
2f2dc053 SW |
410 | /* |
411 | * create+register a new session for given mds. | |
412 | * called under mdsc->mutex. | |
413 | */ | |
414 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
415 | int mds) | |
416 | { | |
417 | struct ceph_mds_session *s; | |
418 | ||
c338c07c NY |
419 | if (mds >= mdsc->mdsmap->m_max_mds) |
420 | return ERR_PTR(-EINVAL); | |
421 | ||
2f2dc053 | 422 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
423 | if (!s) |
424 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
425 | s->s_mdsc = mdsc; |
426 | s->s_mds = mds; | |
427 | s->s_state = CEPH_MDS_SESSION_NEW; | |
428 | s->s_ttl = 0; | |
429 | s->s_seq = 0; | |
430 | mutex_init(&s->s_mutex); | |
431 | ||
b7a9e5dd | 432 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 433 | |
d8fb02ab | 434 | spin_lock_init(&s->s_gen_ttl_lock); |
2f2dc053 | 435 | s->s_cap_gen = 0; |
1ce208a6 | 436 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
437 | |
438 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 SW |
439 | s->s_renew_requested = 0; |
440 | s->s_renew_seq = 0; | |
441 | INIT_LIST_HEAD(&s->s_caps); | |
442 | s->s_nr_caps = 0; | |
5dacf091 | 443 | s->s_trim_caps = 0; |
2f2dc053 SW |
444 | atomic_set(&s->s_ref, 1); |
445 | INIT_LIST_HEAD(&s->s_waiting); | |
446 | INIT_LIST_HEAD(&s->s_unsafe); | |
447 | s->s_num_cap_releases = 0; | |
99a9c273 | 448 | s->s_cap_reconnect = 0; |
7c1332b8 | 449 | s->s_cap_iterator = NULL; |
2f2dc053 SW |
450 | INIT_LIST_HEAD(&s->s_cap_releases); |
451 | INIT_LIST_HEAD(&s->s_cap_releases_done); | |
452 | INIT_LIST_HEAD(&s->s_cap_flushing); | |
453 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); | |
454 | ||
455 | dout("register_session mds%d\n", mds); | |
456 | if (mds >= mdsc->max_sessions) { | |
457 | int newmax = 1 << get_count_order(mds+1); | |
458 | struct ceph_mds_session **sa; | |
459 | ||
460 | dout("register_session realloc to %d\n", newmax); | |
461 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
462 | if (sa == NULL) | |
42ce56e5 | 463 | goto fail_realloc; |
2f2dc053 SW |
464 | if (mdsc->sessions) { |
465 | memcpy(sa, mdsc->sessions, | |
466 | mdsc->max_sessions * sizeof(void *)); | |
467 | kfree(mdsc->sessions); | |
468 | } | |
469 | mdsc->sessions = sa; | |
470 | mdsc->max_sessions = newmax; | |
471 | } | |
472 | mdsc->sessions[mds] = s; | |
473 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ | |
42ce56e5 | 474 | |
b7a9e5dd SW |
475 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
476 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 477 | |
2f2dc053 | 478 | return s; |
42ce56e5 SW |
479 | |
480 | fail_realloc: | |
481 | kfree(s); | |
482 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
483 | } |
484 | ||
485 | /* | |
486 | * called under mdsc->mutex | |
487 | */ | |
2600d2dd | 488 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 489 | struct ceph_mds_session *s) |
2f2dc053 | 490 | { |
2600d2dd SW |
491 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
492 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
493 | mdsc->sessions[s->s_mds] = NULL; |
494 | ceph_con_close(&s->s_con); | |
495 | ceph_put_mds_session(s); | |
2f2dc053 SW |
496 | } |
497 | ||
498 | /* | |
499 | * drop session refs in request. | |
500 | * | |
501 | * should be last request ref, or hold mdsc->mutex | |
502 | */ | |
503 | static void put_request_session(struct ceph_mds_request *req) | |
504 | { | |
505 | if (req->r_session) { | |
506 | ceph_put_mds_session(req->r_session); | |
507 | req->r_session = NULL; | |
508 | } | |
509 | } | |
510 | ||
153c8e6b | 511 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 512 | { |
153c8e6b SW |
513 | struct ceph_mds_request *req = container_of(kref, |
514 | struct ceph_mds_request, | |
515 | r_kref); | |
54008399 | 516 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
517 | if (req->r_request) |
518 | ceph_msg_put(req->r_request); | |
54008399 | 519 | if (req->r_reply) |
153c8e6b | 520 | ceph_msg_put(req->r_reply); |
153c8e6b | 521 | if (req->r_inode) { |
41b02e1f | 522 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
523 | iput(req->r_inode); |
524 | } | |
525 | if (req->r_locked_dir) | |
41b02e1f | 526 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
153c8e6b SW |
527 | if (req->r_target_inode) |
528 | iput(req->r_target_inode); | |
529 | if (req->r_dentry) | |
530 | dput(req->r_dentry); | |
844d87c3 SW |
531 | if (req->r_old_dentry) |
532 | dput(req->r_old_dentry); | |
533 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
534 | /* |
535 | * track (and drop pins for) r_old_dentry_dir | |
536 | * separately, since r_old_dentry's d_parent may have | |
537 | * changed between the dir mutex being dropped and | |
538 | * this request being freed. | |
539 | */ | |
540 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
541 | CEPH_CAP_PIN); | |
41b02e1f | 542 | iput(req->r_old_dentry_dir); |
2f2dc053 | 543 | } |
153c8e6b SW |
544 | kfree(req->r_path1); |
545 | kfree(req->r_path2); | |
25e6bae3 YZ |
546 | if (req->r_pagelist) |
547 | ceph_pagelist_release(req->r_pagelist); | |
153c8e6b | 548 | put_request_session(req); |
37151668 | 549 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 550 | kfree(req); |
2f2dc053 SW |
551 | } |
552 | ||
553 | /* | |
554 | * lookup session, bump ref if found. | |
555 | * | |
556 | * called under mdsc->mutex. | |
557 | */ | |
558 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, | |
559 | u64 tid) | |
560 | { | |
561 | struct ceph_mds_request *req; | |
44ca18f2 SW |
562 | struct rb_node *n = mdsc->request_tree.rb_node; |
563 | ||
564 | while (n) { | |
565 | req = rb_entry(n, struct ceph_mds_request, r_node); | |
566 | if (tid < req->r_tid) | |
567 | n = n->rb_left; | |
568 | else if (tid > req->r_tid) | |
569 | n = n->rb_right; | |
570 | else { | |
571 | ceph_mdsc_get_request(req); | |
572 | return req; | |
573 | } | |
574 | } | |
575 | return NULL; | |
576 | } | |
577 | ||
578 | static void __insert_request(struct ceph_mds_client *mdsc, | |
579 | struct ceph_mds_request *new) | |
580 | { | |
581 | struct rb_node **p = &mdsc->request_tree.rb_node; | |
582 | struct rb_node *parent = NULL; | |
583 | struct ceph_mds_request *req = NULL; | |
584 | ||
585 | while (*p) { | |
586 | parent = *p; | |
587 | req = rb_entry(parent, struct ceph_mds_request, r_node); | |
588 | if (new->r_tid < req->r_tid) | |
589 | p = &(*p)->rb_left; | |
590 | else if (new->r_tid > req->r_tid) | |
591 | p = &(*p)->rb_right; | |
592 | else | |
593 | BUG(); | |
594 | } | |
595 | ||
596 | rb_link_node(&new->r_node, parent, p); | |
597 | rb_insert_color(&new->r_node, &mdsc->request_tree); | |
2f2dc053 SW |
598 | } |
599 | ||
600 | /* | |
601 | * Register an in-flight request, and assign a tid. Link to directory | |
602 | * are modifying (if any). | |
603 | * | |
604 | * Called under mdsc->mutex. | |
605 | */ | |
606 | static void __register_request(struct ceph_mds_client *mdsc, | |
607 | struct ceph_mds_request *req, | |
608 | struct inode *dir) | |
609 | { | |
610 | req->r_tid = ++mdsc->last_tid; | |
611 | if (req->r_num_caps) | |
37151668 YS |
612 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
613 | req->r_num_caps); | |
2f2dc053 SW |
614 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
615 | ceph_mdsc_get_request(req); | |
44ca18f2 | 616 | __insert_request(mdsc, req); |
2f2dc053 | 617 | |
cb4276cc SW |
618 | req->r_uid = current_fsuid(); |
619 | req->r_gid = current_fsgid(); | |
620 | ||
2f2dc053 SW |
621 | if (dir) { |
622 | struct ceph_inode_info *ci = ceph_inode(dir); | |
623 | ||
3b663780 | 624 | ihold(dir); |
2f2dc053 SW |
625 | spin_lock(&ci->i_unsafe_lock); |
626 | req->r_unsafe_dir = dir; | |
627 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
628 | spin_unlock(&ci->i_unsafe_lock); | |
629 | } | |
630 | } | |
631 | ||
632 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
633 | struct ceph_mds_request *req) | |
634 | { | |
635 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
44ca18f2 | 636 | rb_erase(&req->r_node, &mdsc->request_tree); |
80fc7314 | 637 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
638 | |
639 | if (req->r_unsafe_dir) { | |
640 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); | |
641 | ||
642 | spin_lock(&ci->i_unsafe_lock); | |
643 | list_del_init(&req->r_unsafe_dir_item); | |
644 | spin_unlock(&ci->i_unsafe_lock); | |
3b663780 SW |
645 | |
646 | iput(req->r_unsafe_dir); | |
647 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 648 | } |
94aa8ae1 | 649 | |
fc55d2c9 YZ |
650 | complete_all(&req->r_safe_completion); |
651 | ||
94aa8ae1 | 652 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
653 | } |
654 | ||
655 | /* | |
656 | * Choose mds to send request to next. If there is a hint set in the | |
657 | * request (e.g., due to a prior forward hint from the mds), use that. | |
658 | * Otherwise, consult frag tree and/or caps to identify the | |
659 | * appropriate mds. If all else fails, choose randomly. | |
660 | * | |
661 | * Called under mdsc->mutex. | |
662 | */ | |
7fd7d101 | 663 | static struct dentry *get_nonsnap_parent(struct dentry *dentry) |
eb6bb1c5 | 664 | { |
d79698da SW |
665 | /* |
666 | * we don't need to worry about protecting the d_parent access | |
667 | * here because we never renaming inside the snapped namespace | |
668 | * except to resplice to another snapdir, and either the old or new | |
669 | * result is a valid result. | |
670 | */ | |
eb6bb1c5 SW |
671 | while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) |
672 | dentry = dentry->d_parent; | |
673 | return dentry; | |
674 | } | |
675 | ||
2f2dc053 SW |
676 | static int __choose_mds(struct ceph_mds_client *mdsc, |
677 | struct ceph_mds_request *req) | |
678 | { | |
679 | struct inode *inode; | |
680 | struct ceph_inode_info *ci; | |
681 | struct ceph_cap *cap; | |
682 | int mode = req->r_direct_mode; | |
683 | int mds = -1; | |
684 | u32 hash = req->r_direct_hash; | |
685 | bool is_hash = req->r_direct_is_hash; | |
686 | ||
687 | /* | |
688 | * is there a specific mds we should try? ignore hint if we have | |
689 | * no session and the mds is not up (active or recovering). | |
690 | */ | |
691 | if (req->r_resend_mds >= 0 && | |
692 | (__have_session(mdsc, req->r_resend_mds) || | |
693 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
694 | dout("choose_mds using resend_mds mds%d\n", | |
695 | req->r_resend_mds); | |
696 | return req->r_resend_mds; | |
697 | } | |
698 | ||
699 | if (mode == USE_RANDOM_MDS) | |
700 | goto random; | |
701 | ||
702 | inode = NULL; | |
703 | if (req->r_inode) { | |
704 | inode = req->r_inode; | |
705 | } else if (req->r_dentry) { | |
d79698da SW |
706 | /* ignore race with rename; old or new d_parent is okay */ |
707 | struct dentry *parent = req->r_dentry->d_parent; | |
708 | struct inode *dir = parent->d_inode; | |
eb6bb1c5 | 709 | |
3d14c5d2 | 710 | if (dir->i_sb != mdsc->fsc->sb) { |
eb6bb1c5 SW |
711 | /* not this fs! */ |
712 | inode = req->r_dentry->d_inode; | |
713 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { | |
714 | /* direct snapped/virtual snapdir requests | |
715 | * based on parent dir inode */ | |
d79698da | 716 | struct dentry *dn = get_nonsnap_parent(parent); |
eb6bb1c5 SW |
717 | inode = dn->d_inode; |
718 | dout("__choose_mds using nonsnap parent %p\n", inode); | |
ca18bede | 719 | } else { |
eb6bb1c5 | 720 | /* dentry target */ |
2f2dc053 | 721 | inode = req->r_dentry->d_inode; |
ca18bede YZ |
722 | if (!inode || mode == USE_AUTH_MDS) { |
723 | /* dir + name */ | |
724 | inode = dir; | |
725 | hash = ceph_dentry_hash(dir, req->r_dentry); | |
726 | is_hash = true; | |
727 | } | |
2f2dc053 SW |
728 | } |
729 | } | |
eb6bb1c5 | 730 | |
2f2dc053 SW |
731 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
732 | (int)hash, mode); | |
733 | if (!inode) | |
734 | goto random; | |
735 | ci = ceph_inode(inode); | |
736 | ||
737 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
738 | struct ceph_inode_frag frag; | |
739 | int found; | |
740 | ||
741 | ceph_choose_frag(ci, hash, &frag, &found); | |
742 | if (found) { | |
743 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
744 | u8 r; | |
745 | ||
746 | /* choose a random replica */ | |
747 | get_random_bytes(&r, 1); | |
748 | r %= frag.ndist; | |
749 | mds = frag.dist[r]; | |
750 | dout("choose_mds %p %llx.%llx " | |
751 | "frag %u mds%d (%d/%d)\n", | |
752 | inode, ceph_vinop(inode), | |
d66bbd44 | 753 | frag.frag, mds, |
2f2dc053 | 754 | (int)r, frag.ndist); |
d66bbd44 SW |
755 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
756 | CEPH_MDS_STATE_ACTIVE) | |
757 | return mds; | |
2f2dc053 SW |
758 | } |
759 | ||
760 | /* since this file/dir wasn't known to be | |
761 | * replicated, then we want to look for the | |
762 | * authoritative mds. */ | |
763 | mode = USE_AUTH_MDS; | |
764 | if (frag.mds >= 0) { | |
765 | /* choose auth mds */ | |
766 | mds = frag.mds; | |
767 | dout("choose_mds %p %llx.%llx " | |
768 | "frag %u mds%d (auth)\n", | |
769 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
770 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
771 | CEPH_MDS_STATE_ACTIVE) | |
772 | return mds; | |
2f2dc053 SW |
773 | } |
774 | } | |
775 | } | |
776 | ||
be655596 | 777 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
778 | cap = NULL; |
779 | if (mode == USE_AUTH_MDS) | |
780 | cap = ci->i_auth_cap; | |
781 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
782 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
783 | if (!cap) { | |
be655596 | 784 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
785 | goto random; |
786 | } | |
787 | mds = cap->session->s_mds; | |
788 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
789 | inode, ceph_vinop(inode), mds, | |
790 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 791 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
792 | return mds; |
793 | ||
794 | random: | |
795 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
796 | dout("choose_mds chose random mds%d\n", mds); | |
797 | return mds; | |
798 | } | |
799 | ||
800 | ||
801 | /* | |
802 | * session messages | |
803 | */ | |
804 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
805 | { | |
806 | struct ceph_msg *msg; | |
807 | struct ceph_mds_session_head *h; | |
808 | ||
b61c2763 SW |
809 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
810 | false); | |
a79832f2 | 811 | if (!msg) { |
2f2dc053 | 812 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 813 | return NULL; |
2f2dc053 SW |
814 | } |
815 | h = msg->front.iov_base; | |
816 | h->op = cpu_to_le32(op); | |
817 | h->seq = cpu_to_le64(seq); | |
dbd0c8bf JS |
818 | |
819 | return msg; | |
820 | } | |
821 | ||
822 | /* | |
823 | * session message, specialization for CEPH_SESSION_REQUEST_OPEN | |
824 | * to include additional client metadata fields. | |
825 | */ | |
826 | static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) | |
827 | { | |
828 | struct ceph_msg *msg; | |
829 | struct ceph_mds_session_head *h; | |
830 | int i = -1; | |
831 | int metadata_bytes = 0; | |
832 | int metadata_key_count = 0; | |
833 | struct ceph_options *opt = mdsc->fsc->client->options; | |
834 | void *p; | |
835 | ||
836 | const char* metadata[3][2] = { | |
837 | {"hostname", utsname()->nodename}, | |
838 | {"entity_id", opt->name ? opt->name : ""}, | |
839 | {NULL, NULL} | |
840 | }; | |
841 | ||
842 | /* Calculate serialized length of metadata */ | |
843 | metadata_bytes = 4; /* map length */ | |
844 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
845 | metadata_bytes += 8 + strlen(metadata[i][0]) + | |
846 | strlen(metadata[i][1]); | |
847 | metadata_key_count++; | |
848 | } | |
849 | ||
850 | /* Allocate the message */ | |
851 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, | |
852 | GFP_NOFS, false); | |
853 | if (!msg) { | |
854 | pr_err("create_session_msg ENOMEM creating msg\n"); | |
855 | return NULL; | |
856 | } | |
857 | h = msg->front.iov_base; | |
858 | h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); | |
859 | h->seq = cpu_to_le64(seq); | |
860 | ||
861 | /* | |
862 | * Serialize client metadata into waiting buffer space, using | |
863 | * the format that userspace expects for map<string, string> | |
864 | */ | |
865 | msg->hdr.version = 2; /* ClientSession messages with metadata are v2 */ | |
866 | ||
867 | /* The write pointer, following the session_head structure */ | |
868 | p = msg->front.iov_base + sizeof(*h); | |
869 | ||
870 | /* Number of entries in the map */ | |
871 | ceph_encode_32(&p, metadata_key_count); | |
872 | ||
873 | /* Two length-prefixed strings for each entry in the map */ | |
874 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
875 | size_t const key_len = strlen(metadata[i][0]); | |
876 | size_t const val_len = strlen(metadata[i][1]); | |
877 | ||
878 | ceph_encode_32(&p, key_len); | |
879 | memcpy(p, metadata[i][0], key_len); | |
880 | p += key_len; | |
881 | ceph_encode_32(&p, val_len); | |
882 | memcpy(p, metadata[i][1], val_len); | |
883 | p += val_len; | |
884 | } | |
885 | ||
2f2dc053 SW |
886 | return msg; |
887 | } | |
888 | ||
889 | /* | |
890 | * send session open request. | |
891 | * | |
892 | * called under mdsc->mutex | |
893 | */ | |
894 | static int __open_session(struct ceph_mds_client *mdsc, | |
895 | struct ceph_mds_session *session) | |
896 | { | |
897 | struct ceph_msg *msg; | |
898 | int mstate; | |
899 | int mds = session->s_mds; | |
2f2dc053 SW |
900 | |
901 | /* wait for mds to go active? */ | |
902 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
903 | dout("open_session to mds%d (%s)\n", mds, | |
904 | ceph_mds_state_name(mstate)); | |
905 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
906 | session->s_renew_requested = jiffies; | |
907 | ||
908 | /* send connect message */ | |
dbd0c8bf | 909 | msg = create_session_open_msg(mdsc, session->s_seq); |
a79832f2 SW |
910 | if (!msg) |
911 | return -ENOMEM; | |
2f2dc053 | 912 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
913 | return 0; |
914 | } | |
915 | ||
ed0552a1 SW |
916 | /* |
917 | * open sessions for any export targets for the given mds | |
918 | * | |
919 | * called under mdsc->mutex | |
920 | */ | |
5d72d13c YZ |
921 | static struct ceph_mds_session * |
922 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
923 | { | |
924 | struct ceph_mds_session *session; | |
925 | ||
926 | session = __ceph_lookup_mds_session(mdsc, target); | |
927 | if (!session) { | |
928 | session = register_session(mdsc, target); | |
929 | if (IS_ERR(session)) | |
930 | return session; | |
931 | } | |
932 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
933 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
934 | __open_session(mdsc, session); | |
935 | ||
936 | return session; | |
937 | } | |
938 | ||
939 | struct ceph_mds_session * | |
940 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
941 | { | |
942 | struct ceph_mds_session *session; | |
943 | ||
944 | dout("open_export_target_session to mds%d\n", target); | |
945 | ||
946 | mutex_lock(&mdsc->mutex); | |
947 | session = __open_export_target_session(mdsc, target); | |
948 | mutex_unlock(&mdsc->mutex); | |
949 | ||
950 | return session; | |
951 | } | |
952 | ||
ed0552a1 SW |
953 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
954 | struct ceph_mds_session *session) | |
955 | { | |
956 | struct ceph_mds_info *mi; | |
957 | struct ceph_mds_session *ts; | |
958 | int i, mds = session->s_mds; | |
ed0552a1 SW |
959 | |
960 | if (mds >= mdsc->mdsmap->m_max_mds) | |
961 | return; | |
5d72d13c | 962 | |
ed0552a1 SW |
963 | mi = &mdsc->mdsmap->m_info[mds]; |
964 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
965 | session->s_mds, mi->num_export_targets); | |
966 | ||
967 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c YZ |
968 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
969 | if (!IS_ERR(ts)) | |
970 | ceph_put_mds_session(ts); | |
ed0552a1 SW |
971 | } |
972 | } | |
973 | ||
154f42c2 SW |
974 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
975 | struct ceph_mds_session *session) | |
976 | { | |
977 | mutex_lock(&mdsc->mutex); | |
978 | __open_export_target_sessions(mdsc, session); | |
979 | mutex_unlock(&mdsc->mutex); | |
980 | } | |
981 | ||
2f2dc053 SW |
982 | /* |
983 | * session caps | |
984 | */ | |
985 | ||
986 | /* | |
987 | * Free preallocated cap messages assigned to this session | |
988 | */ | |
989 | static void cleanup_cap_releases(struct ceph_mds_session *session) | |
990 | { | |
991 | struct ceph_msg *msg; | |
992 | ||
993 | spin_lock(&session->s_cap_lock); | |
994 | while (!list_empty(&session->s_cap_releases)) { | |
995 | msg = list_first_entry(&session->s_cap_releases, | |
996 | struct ceph_msg, list_head); | |
997 | list_del_init(&msg->list_head); | |
998 | ceph_msg_put(msg); | |
999 | } | |
1000 | while (!list_empty(&session->s_cap_releases_done)) { | |
1001 | msg = list_first_entry(&session->s_cap_releases_done, | |
1002 | struct ceph_msg, list_head); | |
1003 | list_del_init(&msg->list_head); | |
1004 | ceph_msg_put(msg); | |
1005 | } | |
1006 | spin_unlock(&session->s_cap_lock); | |
1007 | } | |
1008 | ||
1009 | /* | |
f818a736 SW |
1010 | * Helper to safely iterate over all caps associated with a session, with |
1011 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 1012 | * |
f818a736 | 1013 | * Caller must hold session s_mutex. |
2f2dc053 SW |
1014 | */ |
1015 | static int iterate_session_caps(struct ceph_mds_session *session, | |
1016 | int (*cb)(struct inode *, struct ceph_cap *, | |
1017 | void *), void *arg) | |
1018 | { | |
7c1332b8 SW |
1019 | struct list_head *p; |
1020 | struct ceph_cap *cap; | |
1021 | struct inode *inode, *last_inode = NULL; | |
1022 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
1023 | int ret; |
1024 | ||
1025 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
1026 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
1027 | p = session->s_caps.next; |
1028 | while (p != &session->s_caps) { | |
1029 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 1030 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
1031 | if (!inode) { |
1032 | p = p->next; | |
2f2dc053 | 1033 | continue; |
7c1332b8 SW |
1034 | } |
1035 | session->s_cap_iterator = cap; | |
2f2dc053 | 1036 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1037 | |
1038 | if (last_inode) { | |
1039 | iput(last_inode); | |
1040 | last_inode = NULL; | |
1041 | } | |
1042 | if (old_cap) { | |
37151668 | 1043 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
1044 | old_cap = NULL; |
1045 | } | |
1046 | ||
2f2dc053 | 1047 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
1048 | last_inode = inode; |
1049 | ||
2f2dc053 | 1050 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
1051 | p = p->next; |
1052 | if (cap->ci == NULL) { | |
1053 | dout("iterate_session_caps finishing cap %p removal\n", | |
1054 | cap); | |
1055 | BUG_ON(cap->session != session); | |
1056 | list_del_init(&cap->session_caps); | |
1057 | session->s_nr_caps--; | |
1058 | cap->session = NULL; | |
1059 | old_cap = cap; /* put_cap it w/o locks held */ | |
1060 | } | |
5dacf091 SW |
1061 | if (ret < 0) |
1062 | goto out; | |
2f2dc053 | 1063 | } |
5dacf091 SW |
1064 | ret = 0; |
1065 | out: | |
7c1332b8 | 1066 | session->s_cap_iterator = NULL; |
2f2dc053 | 1067 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1068 | |
1069 | if (last_inode) | |
1070 | iput(last_inode); | |
1071 | if (old_cap) | |
37151668 | 1072 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1073 | |
5dacf091 | 1074 | return ret; |
2f2dc053 SW |
1075 | } |
1076 | ||
1077 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1078 | void *arg) |
2f2dc053 SW |
1079 | { |
1080 | struct ceph_inode_info *ci = ceph_inode(inode); | |
6c99f254 SW |
1081 | int drop = 0; |
1082 | ||
2f2dc053 SW |
1083 | dout("removing cap %p, ci is %p, inode is %p\n", |
1084 | cap, ci, &ci->vfs_inode); | |
be655596 | 1085 | spin_lock(&ci->i_ceph_lock); |
a096b09a | 1086 | __ceph_remove_cap(cap, false); |
6c99f254 SW |
1087 | if (!__ceph_is_any_real_caps(ci)) { |
1088 | struct ceph_mds_client *mdsc = | |
3d14c5d2 | 1089 | ceph_sb_to_client(inode->i_sb)->mdsc; |
6c99f254 SW |
1090 | |
1091 | spin_lock(&mdsc->cap_dirty_lock); | |
1092 | if (!list_empty(&ci->i_dirty_item)) { | |
1093 | pr_info(" dropping dirty %s state for %p %lld\n", | |
1094 | ceph_cap_string(ci->i_dirty_caps), | |
1095 | inode, ceph_ino(inode)); | |
1096 | ci->i_dirty_caps = 0; | |
1097 | list_del_init(&ci->i_dirty_item); | |
1098 | drop = 1; | |
1099 | } | |
1100 | if (!list_empty(&ci->i_flushing_item)) { | |
1101 | pr_info(" dropping dirty+flushing %s state for %p %lld\n", | |
1102 | ceph_cap_string(ci->i_flushing_caps), | |
1103 | inode, ceph_ino(inode)); | |
1104 | ci->i_flushing_caps = 0; | |
1105 | list_del_init(&ci->i_flushing_item); | |
1106 | mdsc->num_cap_flushing--; | |
1107 | drop = 1; | |
1108 | } | |
1109 | if (drop && ci->i_wrbuffer_ref) { | |
1110 | pr_info(" dropping dirty data for %p %lld\n", | |
1111 | inode, ceph_ino(inode)); | |
1112 | ci->i_wrbuffer_ref = 0; | |
1113 | ci->i_wrbuffer_ref_head = 0; | |
1114 | drop++; | |
1115 | } | |
1116 | spin_unlock(&mdsc->cap_dirty_lock); | |
1117 | } | |
be655596 | 1118 | spin_unlock(&ci->i_ceph_lock); |
6c99f254 SW |
1119 | while (drop--) |
1120 | iput(inode); | |
2f2dc053 SW |
1121 | return 0; |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * caller must hold session s_mutex | |
1126 | */ | |
1127 | static void remove_session_caps(struct ceph_mds_session *session) | |
1128 | { | |
1129 | dout("remove_session_caps on %p\n", session); | |
1130 | iterate_session_caps(session, remove_session_caps_cb, NULL); | |
6f60f889 YZ |
1131 | |
1132 | spin_lock(&session->s_cap_lock); | |
1133 | if (session->s_nr_caps > 0) { | |
1134 | struct super_block *sb = session->s_mdsc->fsc->sb; | |
1135 | struct inode *inode; | |
1136 | struct ceph_cap *cap, *prev = NULL; | |
1137 | struct ceph_vino vino; | |
1138 | /* | |
1139 | * iterate_session_caps() skips inodes that are being | |
1140 | * deleted, we need to wait until deletions are complete. | |
1141 | * __wait_on_freeing_inode() is designed for the job, | |
1142 | * but it is not exported, so use lookup inode function | |
1143 | * to access it. | |
1144 | */ | |
1145 | while (!list_empty(&session->s_caps)) { | |
1146 | cap = list_entry(session->s_caps.next, | |
1147 | struct ceph_cap, session_caps); | |
1148 | if (cap == prev) | |
1149 | break; | |
1150 | prev = cap; | |
1151 | vino = cap->ci->i_vino; | |
1152 | spin_unlock(&session->s_cap_lock); | |
1153 | ||
ed284c49 | 1154 | inode = ceph_find_inode(sb, vino); |
6f60f889 YZ |
1155 | iput(inode); |
1156 | ||
1157 | spin_lock(&session->s_cap_lock); | |
1158 | } | |
1159 | } | |
1160 | spin_unlock(&session->s_cap_lock); | |
1161 | ||
2f2dc053 | 1162 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1163 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
2f2dc053 SW |
1164 | cleanup_cap_releases(session); |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * wake up any threads waiting on this session's caps. if the cap is | |
1169 | * old (didn't get renewed on the client reconnect), remove it now. | |
1170 | * | |
1171 | * caller must hold s_mutex. | |
1172 | */ | |
1173 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1174 | void *arg) | |
1175 | { | |
0dc2570f SW |
1176 | struct ceph_inode_info *ci = ceph_inode(inode); |
1177 | ||
03066f23 | 1178 | wake_up_all(&ci->i_cap_wq); |
0dc2570f | 1179 | if (arg) { |
be655596 | 1180 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1181 | ci->i_wanted_max_size = 0; |
1182 | ci->i_requested_max_size = 0; | |
be655596 | 1183 | spin_unlock(&ci->i_ceph_lock); |
0dc2570f | 1184 | } |
2f2dc053 SW |
1185 | return 0; |
1186 | } | |
1187 | ||
0dc2570f SW |
1188 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1189 | int reconnect) | |
2f2dc053 SW |
1190 | { |
1191 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1192 | iterate_session_caps(session, wake_up_session_cb, |
1193 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * Send periodic message to MDS renewing all currently held caps. The | |
1198 | * ack will reset the expiration for all caps from this session. | |
1199 | * | |
1200 | * caller holds s_mutex | |
1201 | */ | |
1202 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1203 | struct ceph_mds_session *session) | |
1204 | { | |
1205 | struct ceph_msg *msg; | |
1206 | int state; | |
1207 | ||
1208 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1209 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1210 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1211 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1212 | |
1213 | /* do not try to renew caps until a recovering mds has reconnected | |
1214 | * with its clients. */ | |
1215 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1216 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1217 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1218 | session->s_mds, ceph_mds_state_name(state)); | |
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1223 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1224 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1225 | ++session->s_renew_seq); | |
a79832f2 SW |
1226 | if (!msg) |
1227 | return -ENOMEM; | |
2f2dc053 SW |
1228 | ceph_con_send(&session->s_con, msg); |
1229 | return 0; | |
1230 | } | |
1231 | ||
186e4f7a YZ |
1232 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1233 | struct ceph_mds_session *session, u64 seq) | |
1234 | { | |
1235 | struct ceph_msg *msg; | |
1236 | ||
1237 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
a687ecaf | 1238 | session->s_mds, ceph_session_state_name(session->s_state), seq); |
186e4f7a YZ |
1239 | msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); |
1240 | if (!msg) | |
1241 | return -ENOMEM; | |
1242 | ceph_con_send(&session->s_con, msg); | |
1243 | return 0; | |
1244 | } | |
1245 | ||
1246 | ||
2f2dc053 SW |
1247 | /* |
1248 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1249 | * |
1250 | * Called under session->s_mutex | |
2f2dc053 SW |
1251 | */ |
1252 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1253 | struct ceph_mds_session *session, int is_renew) | |
1254 | { | |
1255 | int was_stale; | |
1256 | int wake = 0; | |
1257 | ||
1258 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1259 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1260 | |
1261 | session->s_cap_ttl = session->s_renew_requested + | |
1262 | mdsc->mdsmap->m_session_timeout*HZ; | |
1263 | ||
1264 | if (was_stale) { | |
1265 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1266 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1267 | wake = 1; | |
1268 | } else { | |
1269 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1270 | } | |
1271 | } | |
1272 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1273 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1274 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1275 | spin_unlock(&session->s_cap_lock); | |
1276 | ||
1277 | if (wake) | |
0dc2570f | 1278 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1279 | } |
1280 | ||
1281 | /* | |
1282 | * send a session close request | |
1283 | */ | |
1284 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1285 | struct ceph_mds_session *session) | |
1286 | { | |
1287 | struct ceph_msg *msg; | |
2f2dc053 SW |
1288 | |
1289 | dout("request_close_session mds%d state %s seq %lld\n", | |
a687ecaf | 1290 | session->s_mds, ceph_session_state_name(session->s_state), |
2f2dc053 SW |
1291 | session->s_seq); |
1292 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1293 | if (!msg) |
1294 | return -ENOMEM; | |
1295 | ceph_con_send(&session->s_con, msg); | |
1296 | return 0; | |
2f2dc053 SW |
1297 | } |
1298 | ||
1299 | /* | |
1300 | * Called with s_mutex held. | |
1301 | */ | |
1302 | static int __close_session(struct ceph_mds_client *mdsc, | |
1303 | struct ceph_mds_session *session) | |
1304 | { | |
1305 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1306 | return 0; | |
1307 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1308 | return request_close_session(mdsc, session); | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Trim old(er) caps. | |
1313 | * | |
1314 | * Because we can't cache an inode without one or more caps, we do | |
1315 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1316 | * point the inode will hopefully get dropped to. | |
1317 | * | |
1318 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1319 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1320 | */ | |
1321 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1322 | { | |
1323 | struct ceph_mds_session *session = arg; | |
1324 | struct ceph_inode_info *ci = ceph_inode(inode); | |
979abfdd | 1325 | int used, wanted, oissued, mine; |
2f2dc053 SW |
1326 | |
1327 | if (session->s_trim_caps <= 0) | |
1328 | return -1; | |
1329 | ||
be655596 | 1330 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1331 | mine = cap->issued | cap->implemented; |
1332 | used = __ceph_caps_used(ci); | |
979abfdd | 1333 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1334 | oissued = __ceph_caps_issued_other(ci, cap); |
1335 | ||
979abfdd | 1336 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1337 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1338 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1339 | if (cap == ci->i_auth_cap) { | |
1340 | if (ci->i_dirty_caps | ci->i_flushing_caps) | |
1341 | goto out; | |
1342 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1343 | goto out; | |
1344 | } | |
1345 | if ((used | wanted) & ~oissued & mine) | |
2f2dc053 SW |
1346 | goto out; /* we need these caps */ |
1347 | ||
1348 | session->s_trim_caps--; | |
1349 | if (oissued) { | |
1350 | /* we aren't the only cap.. just remove us */ | |
a096b09a | 1351 | __ceph_remove_cap(cap, true); |
2f2dc053 SW |
1352 | } else { |
1353 | /* try to drop referring dentries */ | |
be655596 | 1354 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1355 | d_prune_aliases(inode); |
1356 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1357 | inode, cap, atomic_read(&inode->i_count)); | |
1358 | return 0; | |
1359 | } | |
1360 | ||
1361 | out: | |
be655596 | 1362 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1363 | return 0; |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * Trim session cap count down to some max number. | |
1368 | */ | |
1369 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1370 | struct ceph_mds_session *session, | |
1371 | int max_caps) | |
1372 | { | |
1373 | int trim_caps = session->s_nr_caps - max_caps; | |
1374 | ||
1375 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1376 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1377 | if (trim_caps > 0) { | |
1378 | session->s_trim_caps = trim_caps; | |
1379 | iterate_session_caps(session, trim_caps_cb, session); | |
1380 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1381 | session->s_mds, session->s_nr_caps, max_caps, | |
1382 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1383 | session->s_trim_caps = 0; |
2f2dc053 | 1384 | } |
a56371d9 YZ |
1385 | |
1386 | ceph_add_cap_releases(mdsc, session); | |
1387 | ceph_send_cap_releases(mdsc, session); | |
2f2dc053 SW |
1388 | return 0; |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * Allocate cap_release messages. If there is a partially full message | |
1393 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1394 | * we can send it immediately. | |
1395 | * | |
1396 | * Called under s_mutex. | |
1397 | */ | |
2b2300d6 | 1398 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
ee6b272b | 1399 | struct ceph_mds_session *session) |
2f2dc053 | 1400 | { |
38e8883e | 1401 | struct ceph_msg *msg, *partial = NULL; |
2f2dc053 SW |
1402 | struct ceph_mds_cap_release *head; |
1403 | int err = -ENOMEM; | |
3d14c5d2 | 1404 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
38e8883e | 1405 | int num; |
2f2dc053 | 1406 | |
38e8883e SW |
1407 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
1408 | extra); | |
2f2dc053 SW |
1409 | |
1410 | spin_lock(&session->s_cap_lock); | |
1411 | ||
1412 | if (!list_empty(&session->s_cap_releases)) { | |
1413 | msg = list_first_entry(&session->s_cap_releases, | |
1414 | struct ceph_msg, | |
1415 | list_head); | |
1416 | head = msg->front.iov_base; | |
38e8883e SW |
1417 | num = le32_to_cpu(head->num); |
1418 | if (num) { | |
1419 | dout(" partial %p with (%d/%d)\n", msg, num, | |
1420 | (int)CEPH_CAPS_PER_RELEASE); | |
1421 | extra += CEPH_CAPS_PER_RELEASE - num; | |
1422 | partial = msg; | |
1423 | } | |
2f2dc053 | 1424 | } |
2f2dc053 SW |
1425 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
1426 | spin_unlock(&session->s_cap_lock); | |
34d23762 | 1427 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
b61c2763 | 1428 | GFP_NOFS, false); |
2f2dc053 SW |
1429 | if (!msg) |
1430 | goto out_unlocked; | |
1431 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1432 | (int)msg->front.iov_len); | |
1433 | head = msg->front.iov_base; | |
1434 | head->num = cpu_to_le32(0); | |
1435 | msg->front.iov_len = sizeof(*head); | |
1436 | spin_lock(&session->s_cap_lock); | |
1437 | list_add(&msg->list_head, &session->s_cap_releases); | |
1438 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1439 | } | |
1440 | ||
38e8883e SW |
1441 | if (partial) { |
1442 | head = partial->front.iov_base; | |
1443 | num = le32_to_cpu(head->num); | |
1444 | dout(" queueing partial %p with %d/%d\n", partial, num, | |
1445 | (int)CEPH_CAPS_PER_RELEASE); | |
1446 | list_move_tail(&partial->list_head, | |
1447 | &session->s_cap_releases_done); | |
1448 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; | |
2f2dc053 SW |
1449 | } |
1450 | err = 0; | |
1451 | spin_unlock(&session->s_cap_lock); | |
1452 | out_unlocked: | |
1453 | return err; | |
1454 | } | |
1455 | ||
1456 | /* | |
1457 | * flush all dirty inode data to disk. | |
1458 | * | |
1459 | * returns true if we've flushed through want_flush_seq | |
1460 | */ | |
1461 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1462 | { | |
1463 | int mds, ret = 1; | |
1464 | ||
1465 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1466 | mutex_lock(&mdsc->mutex); | |
1467 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1468 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1469 | ||
1470 | if (!session) | |
1471 | continue; | |
1472 | get_session(session); | |
1473 | mutex_unlock(&mdsc->mutex); | |
1474 | ||
1475 | mutex_lock(&session->s_mutex); | |
1476 | if (!list_empty(&session->s_cap_flushing)) { | |
1477 | struct ceph_inode_info *ci = | |
1478 | list_entry(session->s_cap_flushing.next, | |
1479 | struct ceph_inode_info, | |
1480 | i_flushing_item); | |
1481 | struct inode *inode = &ci->vfs_inode; | |
1482 | ||
be655596 | 1483 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1484 | if (ci->i_cap_flush_seq <= want_flush_seq) { |
1485 | dout("check_cap_flush still flushing %p " | |
1486 | "seq %lld <= %lld to mds%d\n", inode, | |
1487 | ci->i_cap_flush_seq, want_flush_seq, | |
1488 | session->s_mds); | |
1489 | ret = 0; | |
1490 | } | |
be655596 | 1491 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1492 | } |
1493 | mutex_unlock(&session->s_mutex); | |
1494 | ceph_put_mds_session(session); | |
1495 | ||
1496 | if (!ret) | |
1497 | return ret; | |
1498 | mutex_lock(&mdsc->mutex); | |
1499 | } | |
1500 | ||
1501 | mutex_unlock(&mdsc->mutex); | |
1502 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1503 | return ret; | |
1504 | } | |
1505 | ||
1506 | /* | |
1507 | * called under s_mutex | |
1508 | */ | |
3d7ded4d SW |
1509 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1510 | struct ceph_mds_session *session) | |
2f2dc053 SW |
1511 | { |
1512 | struct ceph_msg *msg; | |
1513 | ||
1514 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1515 | spin_lock(&session->s_cap_lock); |
1516 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1517 | msg = list_first_entry(&session->s_cap_releases_done, |
1518 | struct ceph_msg, list_head); | |
1519 | list_del_init(&msg->list_head); | |
1520 | spin_unlock(&session->s_cap_lock); | |
1521 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1522 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1523 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1524 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1525 | } |
1526 | spin_unlock(&session->s_cap_lock); | |
1527 | } | |
1528 | ||
e01a5946 SW |
1529 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1530 | struct ceph_mds_session *session) | |
1531 | { | |
1532 | struct ceph_msg *msg; | |
1533 | struct ceph_mds_cap_release *head; | |
1534 | unsigned num; | |
1535 | ||
1536 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
e01a5946 | 1537 | |
00bd8edb YZ |
1538 | if (!list_empty(&session->s_cap_releases)) { |
1539 | /* zero out the in-progress message */ | |
1540 | msg = list_first_entry(&session->s_cap_releases, | |
1541 | struct ceph_msg, list_head); | |
1542 | head = msg->front.iov_base; | |
1543 | num = le32_to_cpu(head->num); | |
1544 | dout("discard_cap_releases mds%d %p %u\n", | |
1545 | session->s_mds, msg, num); | |
1546 | head->num = cpu_to_le32(0); | |
1547 | msg->front.iov_len = sizeof(*head); | |
1548 | session->s_num_cap_releases += num; | |
1549 | } | |
e01a5946 SW |
1550 | |
1551 | /* requeue completed messages */ | |
1552 | while (!list_empty(&session->s_cap_releases_done)) { | |
1553 | msg = list_first_entry(&session->s_cap_releases_done, | |
1554 | struct ceph_msg, list_head); | |
1555 | list_del_init(&msg->list_head); | |
1556 | ||
1557 | head = msg->front.iov_base; | |
1558 | num = le32_to_cpu(head->num); | |
1559 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1560 | num); | |
1561 | session->s_num_cap_releases += num; | |
1562 | head->num = cpu_to_le32(0); | |
1563 | msg->front.iov_len = sizeof(*head); | |
1564 | list_add(&msg->list_head, &session->s_cap_releases); | |
1565 | } | |
e01a5946 SW |
1566 | } |
1567 | ||
2f2dc053 SW |
1568 | /* |
1569 | * requests | |
1570 | */ | |
1571 | ||
54008399 YZ |
1572 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
1573 | struct inode *dir) | |
1574 | { | |
1575 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1576 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
1577 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
1578 | size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) + | |
1579 | sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease); | |
1580 | int order, num_entries; | |
1581 | ||
1582 | spin_lock(&ci->i_ceph_lock); | |
1583 | num_entries = ci->i_files + ci->i_subdirs; | |
1584 | spin_unlock(&ci->i_ceph_lock); | |
1585 | num_entries = max(num_entries, 1); | |
1586 | num_entries = min(num_entries, opt->max_readdir); | |
1587 | ||
1588 | order = get_order(size * num_entries); | |
1589 | while (order >= 0) { | |
1590 | rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN, | |
1591 | order); | |
1592 | if (rinfo->dir_in) | |
1593 | break; | |
1594 | order--; | |
1595 | } | |
1596 | if (!rinfo->dir_in) | |
1597 | return -ENOMEM; | |
1598 | ||
1599 | num_entries = (PAGE_SIZE << order) / size; | |
1600 | num_entries = min(num_entries, opt->max_readdir); | |
1601 | ||
1602 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
1603 | req->r_num_caps = num_entries + 1; | |
1604 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
1605 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
1606 | return 0; | |
1607 | } | |
1608 | ||
2f2dc053 SW |
1609 | /* |
1610 | * Create an mds request. | |
1611 | */ | |
1612 | struct ceph_mds_request * | |
1613 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1614 | { | |
1615 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1616 | ||
1617 | if (!req) | |
1618 | return ERR_PTR(-ENOMEM); | |
1619 | ||
b4556396 | 1620 | mutex_init(&req->r_fill_mutex); |
37151668 | 1621 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1622 | req->r_started = jiffies; |
1623 | req->r_resend_mds = -1; | |
1624 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1625 | req->r_fmode = -1; | |
153c8e6b | 1626 | kref_init(&req->r_kref); |
2f2dc053 SW |
1627 | INIT_LIST_HEAD(&req->r_wait); |
1628 | init_completion(&req->r_completion); | |
1629 | init_completion(&req->r_safe_completion); | |
1630 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1631 | ||
b8e69066 SW |
1632 | req->r_stamp = CURRENT_TIME; |
1633 | ||
2f2dc053 SW |
1634 | req->r_op = op; |
1635 | req->r_direct_mode = mode; | |
1636 | return req; | |
1637 | } | |
1638 | ||
1639 | /* | |
44ca18f2 | 1640 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1641 | * |
1642 | * called under mdsc->mutex. | |
1643 | */ | |
44ca18f2 SW |
1644 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1645 | { | |
1646 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1647 | return NULL; | |
1648 | return rb_entry(rb_first(&mdsc->request_tree), | |
1649 | struct ceph_mds_request, r_node); | |
1650 | } | |
1651 | ||
2f2dc053 SW |
1652 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1653 | { | |
44ca18f2 SW |
1654 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1655 | ||
1656 | if (req) | |
1657 | return req->r_tid; | |
1658 | return 0; | |
2f2dc053 SW |
1659 | } |
1660 | ||
1661 | /* | |
1662 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1663 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1664 | * | |
1665 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1666 | * inode. | |
1667 | * | |
1668 | * Encode hidden .snap dirs as a double /, i.e. | |
1669 | * foo/.snap/bar -> foo//bar | |
1670 | */ | |
1671 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1672 | int stop_on_nosnap) | |
1673 | { | |
1674 | struct dentry *temp; | |
1675 | char *path; | |
1676 | int len, pos; | |
1b71fe2e | 1677 | unsigned seq; |
2f2dc053 SW |
1678 | |
1679 | if (dentry == NULL) | |
1680 | return ERR_PTR(-EINVAL); | |
1681 | ||
1682 | retry: | |
1683 | len = 0; | |
1b71fe2e AV |
1684 | seq = read_seqbegin(&rename_lock); |
1685 | rcu_read_lock(); | |
2f2dc053 SW |
1686 | for (temp = dentry; !IS_ROOT(temp);) { |
1687 | struct inode *inode = temp->d_inode; | |
1688 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1689 | len++; /* slash only */ | |
1690 | else if (stop_on_nosnap && inode && | |
1691 | ceph_snap(inode) == CEPH_NOSNAP) | |
1692 | break; | |
1693 | else | |
1694 | len += 1 + temp->d_name.len; | |
1695 | temp = temp->d_parent; | |
2f2dc053 | 1696 | } |
1b71fe2e | 1697 | rcu_read_unlock(); |
2f2dc053 SW |
1698 | if (len) |
1699 | len--; /* no leading '/' */ | |
1700 | ||
1701 | path = kmalloc(len+1, GFP_NOFS); | |
1702 | if (path == NULL) | |
1703 | return ERR_PTR(-ENOMEM); | |
1704 | pos = len; | |
1705 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1706 | rcu_read_lock(); |
2f2dc053 | 1707 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1708 | struct inode *inode; |
2f2dc053 | 1709 | |
1b71fe2e AV |
1710 | spin_lock(&temp->d_lock); |
1711 | inode = temp->d_inode; | |
2f2dc053 | 1712 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1713 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1714 | pos, temp); |
1715 | } else if (stop_on_nosnap && inode && | |
1716 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1717 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1718 | break; |
1719 | } else { | |
1720 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1721 | if (pos < 0) { |
1722 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1723 | break; |
1b71fe2e | 1724 | } |
2f2dc053 SW |
1725 | strncpy(path + pos, temp->d_name.name, |
1726 | temp->d_name.len); | |
2f2dc053 | 1727 | } |
1b71fe2e | 1728 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1729 | if (pos) |
1730 | path[--pos] = '/'; | |
1731 | temp = temp->d_parent; | |
2f2dc053 | 1732 | } |
1b71fe2e AV |
1733 | rcu_read_unlock(); |
1734 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1735 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1736 | "expected, namelen is %d, pos is %d\n", len, pos); |
1737 | /* presumably this is only possible if racing with a | |
1738 | rename of one of the parent directories (we can not | |
1739 | lock the dentries above us to prevent this, but | |
1740 | retrying should be harmless) */ | |
1741 | kfree(path); | |
1742 | goto retry; | |
1743 | } | |
1744 | ||
1745 | *base = ceph_ino(temp->d_inode); | |
1746 | *plen = len; | |
104648ad | 1747 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1748 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1749 | return path; |
1750 | } | |
1751 | ||
1752 | static int build_dentry_path(struct dentry *dentry, | |
1753 | const char **ppath, int *ppathlen, u64 *pino, | |
1754 | int *pfreepath) | |
1755 | { | |
1756 | char *path; | |
1757 | ||
1758 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1759 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1760 | *ppath = dentry->d_name.name; | |
1761 | *ppathlen = dentry->d_name.len; | |
1762 | return 0; | |
1763 | } | |
1764 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1765 | if (IS_ERR(path)) | |
1766 | return PTR_ERR(path); | |
1767 | *ppath = path; | |
1768 | *pfreepath = 1; | |
1769 | return 0; | |
1770 | } | |
1771 | ||
1772 | static int build_inode_path(struct inode *inode, | |
1773 | const char **ppath, int *ppathlen, u64 *pino, | |
1774 | int *pfreepath) | |
1775 | { | |
1776 | struct dentry *dentry; | |
1777 | char *path; | |
1778 | ||
1779 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1780 | *pino = ceph_ino(inode); | |
1781 | *ppathlen = 0; | |
1782 | return 0; | |
1783 | } | |
1784 | dentry = d_find_alias(inode); | |
1785 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1786 | dput(dentry); | |
1787 | if (IS_ERR(path)) | |
1788 | return PTR_ERR(path); | |
1789 | *ppath = path; | |
1790 | *pfreepath = 1; | |
1791 | return 0; | |
1792 | } | |
1793 | ||
1794 | /* | |
1795 | * request arguments may be specified via an inode *, a dentry *, or | |
1796 | * an explicit ino+path. | |
1797 | */ | |
1798 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1799 | const char *rpath, u64 rino, | |
1800 | const char **ppath, int *pathlen, | |
1801 | u64 *ino, int *freepath) | |
1802 | { | |
1803 | int r = 0; | |
1804 | ||
1805 | if (rinode) { | |
1806 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1807 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1808 | ceph_snap(rinode)); | |
1809 | } else if (rdentry) { | |
1810 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1811 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1812 | *ppath); | |
795858db | 1813 | } else if (rpath || rino) { |
2f2dc053 SW |
1814 | *ino = rino; |
1815 | *ppath = rpath; | |
b000056a | 1816 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1817 | dout(" path %.*s\n", *pathlen, rpath); |
1818 | } | |
1819 | ||
1820 | return r; | |
1821 | } | |
1822 | ||
1823 | /* | |
1824 | * called under mdsc->mutex | |
1825 | */ | |
1826 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1827 | struct ceph_mds_request *req, | |
1828 | int mds) | |
1829 | { | |
1830 | struct ceph_msg *msg; | |
1831 | struct ceph_mds_request_head *head; | |
1832 | const char *path1 = NULL; | |
1833 | const char *path2 = NULL; | |
1834 | u64 ino1 = 0, ino2 = 0; | |
1835 | int pathlen1 = 0, pathlen2 = 0; | |
1836 | int freepath1 = 0, freepath2 = 0; | |
1837 | int len; | |
1838 | u16 releases; | |
1839 | void *p, *end; | |
1840 | int ret; | |
1841 | ||
1842 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1843 | req->r_path1, req->r_ino1.ino, | |
1844 | &path1, &pathlen1, &ino1, &freepath1); | |
1845 | if (ret < 0) { | |
1846 | msg = ERR_PTR(ret); | |
1847 | goto out; | |
1848 | } | |
1849 | ||
1850 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1851 | req->r_path2, req->r_ino2.ino, | |
1852 | &path2, &pathlen2, &ino2, &freepath2); | |
1853 | if (ret < 0) { | |
1854 | msg = ERR_PTR(ret); | |
1855 | goto out_free1; | |
1856 | } | |
1857 | ||
1858 | len = sizeof(*head) + | |
b8e69066 SW |
1859 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
1860 | sizeof(struct timespec); | |
2f2dc053 SW |
1861 | |
1862 | /* calculate (max) length for cap releases */ | |
1863 | len += sizeof(struct ceph_mds_request_release) * | |
1864 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1865 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1866 | if (req->r_dentry_drop) | |
1867 | len += req->r_dentry->d_name.len; | |
1868 | if (req->r_old_dentry_drop) | |
1869 | len += req->r_old_dentry->d_name.len; | |
1870 | ||
b61c2763 | 1871 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
1872 | if (!msg) { |
1873 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1874 | goto out_free2; |
a79832f2 | 1875 | } |
2f2dc053 | 1876 | |
b8e69066 | 1877 | msg->hdr.version = 2; |
6df058c0 SW |
1878 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1879 | ||
2f2dc053 SW |
1880 | head = msg->front.iov_base; |
1881 | p = msg->front.iov_base + sizeof(*head); | |
1882 | end = msg->front.iov_base + msg->front.iov_len; | |
1883 | ||
1884 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1885 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
1886 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
1887 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
1888 | head->args = req->r_args; |
1889 | ||
1890 | ceph_encode_filepath(&p, end, ino1, path1); | |
1891 | ceph_encode_filepath(&p, end, ino2, path2); | |
1892 | ||
e979cf50 SW |
1893 | /* make note of release offset, in case we need to replay */ |
1894 | req->r_request_release_offset = p - msg->front.iov_base; | |
1895 | ||
2f2dc053 SW |
1896 | /* cap releases */ |
1897 | releases = 0; | |
1898 | if (req->r_inode_drop) | |
1899 | releases += ceph_encode_inode_release(&p, | |
1900 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1901 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1902 | if (req->r_dentry_drop) | |
1903 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1904 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1905 | if (req->r_old_dentry_drop) | |
1906 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1907 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1908 | if (req->r_old_inode_drop) | |
1909 | releases += ceph_encode_inode_release(&p, | |
1910 | req->r_old_dentry->d_inode, | |
1911 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1912 | head->num_releases = cpu_to_le16(releases); | |
1913 | ||
b8e69066 SW |
1914 | /* time stamp */ |
1915 | ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp)); | |
1916 | ||
2f2dc053 SW |
1917 | BUG_ON(p > end); |
1918 | msg->front.iov_len = p - msg->front.iov_base; | |
1919 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1920 | ||
25e6bae3 YZ |
1921 | if (req->r_pagelist) { |
1922 | struct ceph_pagelist *pagelist = req->r_pagelist; | |
1923 | atomic_inc(&pagelist->refcnt); | |
1924 | ceph_msg_data_add_pagelist(msg, pagelist); | |
1925 | msg->hdr.data_len = cpu_to_le32(pagelist->length); | |
1926 | } else { | |
1927 | msg->hdr.data_len = 0; | |
ebf18f47 | 1928 | } |
02afca6c | 1929 | |
2f2dc053 SW |
1930 | msg->hdr.data_off = cpu_to_le16(0); |
1931 | ||
1932 | out_free2: | |
1933 | if (freepath2) | |
1934 | kfree((char *)path2); | |
1935 | out_free1: | |
1936 | if (freepath1) | |
1937 | kfree((char *)path1); | |
1938 | out: | |
1939 | return msg; | |
1940 | } | |
1941 | ||
1942 | /* | |
1943 | * called under mdsc->mutex if error, under no mutex if | |
1944 | * success. | |
1945 | */ | |
1946 | static void complete_request(struct ceph_mds_client *mdsc, | |
1947 | struct ceph_mds_request *req) | |
1948 | { | |
1949 | if (req->r_callback) | |
1950 | req->r_callback(mdsc, req); | |
1951 | else | |
03066f23 | 1952 | complete_all(&req->r_completion); |
2f2dc053 SW |
1953 | } |
1954 | ||
1955 | /* | |
1956 | * called under mdsc->mutex | |
1957 | */ | |
1958 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1959 | struct ceph_mds_request *req, | |
1960 | int mds) | |
1961 | { | |
1962 | struct ceph_mds_request_head *rhead; | |
1963 | struct ceph_msg *msg; | |
1964 | int flags = 0; | |
1965 | ||
2f2dc053 | 1966 | req->r_attempts++; |
e55b71f8 GF |
1967 | if (req->r_inode) { |
1968 | struct ceph_cap *cap = | |
1969 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
1970 | ||
1971 | if (cap) | |
1972 | req->r_sent_on_mseq = cap->mseq; | |
1973 | else | |
1974 | req->r_sent_on_mseq = -1; | |
1975 | } | |
2f2dc053 SW |
1976 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
1977 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1978 | ||
01a92f17 | 1979 | if (req->r_got_unsafe) { |
c5c9a0bf | 1980 | void *p; |
01a92f17 SW |
1981 | /* |
1982 | * Replay. Do not regenerate message (and rebuild | |
1983 | * paths, etc.); just use the original message. | |
1984 | * Rebuilding paths will break for renames because | |
1985 | * d_move mangles the src name. | |
1986 | */ | |
1987 | msg = req->r_request; | |
1988 | rhead = msg->front.iov_base; | |
1989 | ||
1990 | flags = le32_to_cpu(rhead->flags); | |
1991 | flags |= CEPH_MDS_FLAG_REPLAY; | |
1992 | rhead->flags = cpu_to_le32(flags); | |
1993 | ||
1994 | if (req->r_target_inode) | |
1995 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
1996 | ||
1997 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
1998 | |
1999 | /* remove cap/dentry releases from message */ | |
2000 | rhead->num_releases = 0; | |
c5c9a0bf YZ |
2001 | |
2002 | /* time stamp */ | |
2003 | p = msg->front.iov_base + req->r_request_release_offset; | |
2004 | ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp)); | |
2005 | ||
2006 | msg->front.iov_len = p - msg->front.iov_base; | |
2007 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
01a92f17 SW |
2008 | return 0; |
2009 | } | |
2010 | ||
2f2dc053 SW |
2011 | if (req->r_request) { |
2012 | ceph_msg_put(req->r_request); | |
2013 | req->r_request = NULL; | |
2014 | } | |
2015 | msg = create_request_message(mdsc, req, mds); | |
2016 | if (IS_ERR(msg)) { | |
e1518c7c | 2017 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 2018 | complete_request(mdsc, req); |
a79832f2 | 2019 | return PTR_ERR(msg); |
2f2dc053 SW |
2020 | } |
2021 | req->r_request = msg; | |
2022 | ||
2023 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
2024 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
2025 | if (req->r_got_unsafe) | |
2026 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2027 | if (req->r_locked_dir) | |
2028 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
2029 | rhead->flags = cpu_to_le32(flags); | |
2030 | rhead->num_fwd = req->r_num_fwd; | |
2031 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 2032 | rhead->ino = 0; |
2f2dc053 SW |
2033 | |
2034 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
2035 | return 0; |
2036 | } | |
2037 | ||
2038 | /* | |
2039 | * send request, or put it on the appropriate wait list. | |
2040 | */ | |
2041 | static int __do_request(struct ceph_mds_client *mdsc, | |
2042 | struct ceph_mds_request *req) | |
2043 | { | |
2044 | struct ceph_mds_session *session = NULL; | |
2045 | int mds = -1; | |
2046 | int err = -EAGAIN; | |
2047 | ||
eb1b8af3 YZ |
2048 | if (req->r_err || req->r_got_result) { |
2049 | if (req->r_aborted) | |
2050 | __unregister_request(mdsc, req); | |
2f2dc053 | 2051 | goto out; |
eb1b8af3 | 2052 | } |
2f2dc053 SW |
2053 | |
2054 | if (req->r_timeout && | |
2055 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
2056 | dout("do_request timed out\n"); | |
2057 | err = -EIO; | |
2058 | goto finish; | |
2059 | } | |
2060 | ||
dc69e2e9 SW |
2061 | put_request_session(req); |
2062 | ||
2f2dc053 SW |
2063 | mds = __choose_mds(mdsc, req); |
2064 | if (mds < 0 || | |
2065 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
2066 | dout("do_request no mds or not active, waiting for map\n"); | |
2067 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2068 | goto out; | |
2069 | } | |
2070 | ||
2071 | /* get, open session */ | |
2072 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 2073 | if (!session) { |
2f2dc053 | 2074 | session = register_session(mdsc, mds); |
9c423956 SW |
2075 | if (IS_ERR(session)) { |
2076 | err = PTR_ERR(session); | |
2077 | goto finish; | |
2078 | } | |
2079 | } | |
dc69e2e9 SW |
2080 | req->r_session = get_session(session); |
2081 | ||
2f2dc053 | 2082 | dout("do_request mds%d session %p state %s\n", mds, session, |
a687ecaf | 2083 | ceph_session_state_name(session->s_state)); |
2f2dc053 SW |
2084 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
2085 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
2086 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
2087 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
2088 | __open_session(mdsc, session); | |
2089 | list_add(&req->r_wait, &session->s_waiting); | |
2090 | goto out_session; | |
2091 | } | |
2092 | ||
2093 | /* send request */ | |
2f2dc053 SW |
2094 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2095 | ||
2096 | if (req->r_request_started == 0) /* note request start time */ | |
2097 | req->r_request_started = jiffies; | |
2098 | ||
2099 | err = __prepare_send_request(mdsc, req, mds); | |
2100 | if (!err) { | |
2101 | ceph_msg_get(req->r_request); | |
2102 | ceph_con_send(&session->s_con, req->r_request); | |
2103 | } | |
2104 | ||
2105 | out_session: | |
2106 | ceph_put_mds_session(session); | |
2107 | out: | |
2108 | return err; | |
2109 | ||
2110 | finish: | |
e1518c7c | 2111 | req->r_err = err; |
2f2dc053 SW |
2112 | complete_request(mdsc, req); |
2113 | goto out; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * called under mdsc->mutex | |
2118 | */ | |
2119 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
2120 | struct list_head *head) | |
2121 | { | |
ed75ec2c YZ |
2122 | struct ceph_mds_request *req; |
2123 | LIST_HEAD(tmp_list); | |
2124 | ||
2125 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 2126 | |
ed75ec2c YZ |
2127 | while (!list_empty(&tmp_list)) { |
2128 | req = list_entry(tmp_list.next, | |
2129 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2130 | list_del_init(&req->r_wait); |
7971bd92 | 2131 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2132 | __do_request(mdsc, req); |
2133 | } | |
2134 | } | |
2135 | ||
2136 | /* | |
2137 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2138 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2139 | */ |
29790f26 | 2140 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2141 | { |
44ca18f2 | 2142 | struct ceph_mds_request *req; |
282c1052 | 2143 | struct rb_node *p = rb_first(&mdsc->request_tree); |
2f2dc053 SW |
2144 | |
2145 | dout("kick_requests mds%d\n", mds); | |
282c1052 | 2146 | while (p) { |
44ca18f2 | 2147 | req = rb_entry(p, struct ceph_mds_request, r_node); |
282c1052 | 2148 | p = rb_next(p); |
44ca18f2 SW |
2149 | if (req->r_got_unsafe) |
2150 | continue; | |
2151 | if (req->r_session && | |
2152 | req->r_session->s_mds == mds) { | |
2153 | dout(" kicking tid %llu\n", req->r_tid); | |
03974e81 | 2154 | list_del_init(&req->r_wait); |
44ca18f2 | 2155 | __do_request(mdsc, req); |
2f2dc053 SW |
2156 | } |
2157 | } | |
2158 | } | |
2159 | ||
2160 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2161 | struct ceph_mds_request *req) | |
2162 | { | |
2163 | dout("submit_request on %p\n", req); | |
2164 | mutex_lock(&mdsc->mutex); | |
2165 | __register_request(mdsc, req, NULL); | |
2166 | __do_request(mdsc, req); | |
2167 | mutex_unlock(&mdsc->mutex); | |
2168 | } | |
2169 | ||
2170 | /* | |
2171 | * Synchrously perform an mds request. Take care of all of the | |
2172 | * session setup, forwarding, retry details. | |
2173 | */ | |
2174 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2175 | struct inode *dir, | |
2176 | struct ceph_mds_request *req) | |
2177 | { | |
2178 | int err; | |
2179 | ||
2180 | dout("do_request on %p\n", req); | |
2181 | ||
2182 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
2183 | if (req->r_inode) | |
2184 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
2185 | if (req->r_locked_dir) | |
2186 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
844d87c3 | 2187 | if (req->r_old_dentry_dir) |
41b02e1f SW |
2188 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2189 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2190 | |
2191 | /* issue */ | |
2192 | mutex_lock(&mdsc->mutex); | |
2193 | __register_request(mdsc, req, dir); | |
2194 | __do_request(mdsc, req); | |
2195 | ||
e1518c7c SW |
2196 | if (req->r_err) { |
2197 | err = req->r_err; | |
2198 | __unregister_request(mdsc, req); | |
2199 | dout("do_request early error %d\n", err); | |
2200 | goto out; | |
2f2dc053 SW |
2201 | } |
2202 | ||
e1518c7c SW |
2203 | /* wait */ |
2204 | mutex_unlock(&mdsc->mutex); | |
2205 | dout("do_request waiting\n"); | |
2206 | if (req->r_timeout) { | |
aa91647c | 2207 | err = (long)wait_for_completion_killable_timeout( |
e1518c7c SW |
2208 | &req->r_completion, req->r_timeout); |
2209 | if (err == 0) | |
2210 | err = -EIO; | |
2211 | } else { | |
aa91647c | 2212 | err = wait_for_completion_killable(&req->r_completion); |
e1518c7c SW |
2213 | } |
2214 | dout("do_request waited, got %d\n", err); | |
2215 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2216 | |
e1518c7c SW |
2217 | /* only abort if we didn't race with a real reply */ |
2218 | if (req->r_got_result) { | |
2219 | err = le32_to_cpu(req->r_reply_info.head->result); | |
2220 | } else if (err < 0) { | |
2221 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2222 | |
2223 | /* | |
2224 | * ensure we aren't running concurrently with | |
2225 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2226 | * rely on locks (dir mutex) held by our caller. | |
2227 | */ | |
2228 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
2229 | req->r_err = err; |
2230 | req->r_aborted = true; | |
b4556396 | 2231 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2232 | |
e1518c7c | 2233 | if (req->r_locked_dir && |
167c9e35 SW |
2234 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2235 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2236 | } else { |
e1518c7c | 2237 | err = req->r_err; |
2f2dc053 | 2238 | } |
2f2dc053 | 2239 | |
e1518c7c SW |
2240 | out: |
2241 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2242 | dout("do_request %p done, result %d\n", req, err); |
2243 | return err; | |
2244 | } | |
2245 | ||
167c9e35 | 2246 | /* |
2f276c51 | 2247 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2248 | * namespace request. |
2249 | */ | |
2250 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2251 | { | |
2252 | struct inode *inode = req->r_locked_dir; | |
167c9e35 | 2253 | |
2f276c51 | 2254 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2255 | |
2f276c51 | 2256 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2257 | if (req->r_dentry) |
2258 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2259 | if (req->r_old_dentry) | |
2260 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2261 | } | |
2262 | ||
2f2dc053 SW |
2263 | /* |
2264 | * Handle mds reply. | |
2265 | * | |
2266 | * We take the session mutex and parse and process the reply immediately. | |
2267 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2268 | * by the MDS as they are applied to our local cache. | |
2269 | */ | |
2270 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2271 | { | |
2272 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2273 | struct ceph_mds_request *req; | |
2274 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2275 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
2276 | u64 tid; | |
2277 | int err, result; | |
2600d2dd | 2278 | int mds = session->s_mds; |
2f2dc053 | 2279 | |
2f2dc053 SW |
2280 | if (msg->front.iov_len < sizeof(*head)) { |
2281 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2282 | ceph_msg_dump(msg); |
2f2dc053 SW |
2283 | return; |
2284 | } | |
2285 | ||
2286 | /* get request, session */ | |
6df058c0 | 2287 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2288 | mutex_lock(&mdsc->mutex); |
2289 | req = __lookup_request(mdsc, tid); | |
2290 | if (!req) { | |
2291 | dout("handle_reply on unknown tid %llu\n", tid); | |
2292 | mutex_unlock(&mdsc->mutex); | |
2293 | return; | |
2294 | } | |
2295 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2296 | |
2297 | /* correct session? */ | |
d96d6049 | 2298 | if (req->r_session != session) { |
2f2dc053 SW |
2299 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2300 | " not mds%d\n", tid, session->s_mds, | |
2301 | req->r_session ? req->r_session->s_mds : -1); | |
2302 | mutex_unlock(&mdsc->mutex); | |
2303 | goto out; | |
2304 | } | |
2305 | ||
2306 | /* dup? */ | |
2307 | if ((req->r_got_unsafe && !head->safe) || | |
2308 | (req->r_got_safe && head->safe)) { | |
f3ae1b97 | 2309 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
2310 | head->safe ? "safe" : "unsafe", tid, mds); |
2311 | mutex_unlock(&mdsc->mutex); | |
2312 | goto out; | |
2313 | } | |
85792d0d | 2314 | if (req->r_got_safe && !head->safe) { |
f3ae1b97 | 2315 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
2316 | tid, mds); |
2317 | mutex_unlock(&mdsc->mutex); | |
2318 | goto out; | |
2319 | } | |
2f2dc053 SW |
2320 | |
2321 | result = le32_to_cpu(head->result); | |
2322 | ||
2323 | /* | |
e55b71f8 GF |
2324 | * Handle an ESTALE |
2325 | * if we're not talking to the authority, send to them | |
2326 | * if the authority has changed while we weren't looking, | |
2327 | * send to new authority | |
2328 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2329 | */ |
2330 | if (result == -ESTALE) { | |
e55b71f8 | 2331 | dout("got ESTALE on request %llu", req->r_tid); |
51da8e8c | 2332 | req->r_resend_mds = -1; |
ca18bede | 2333 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2334 | dout("not using auth, setting for that now"); |
2335 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2336 | __do_request(mdsc, req); |
2337 | mutex_unlock(&mdsc->mutex); | |
2338 | goto out; | |
e55b71f8 | 2339 | } else { |
ca18bede YZ |
2340 | int mds = __choose_mds(mdsc, req); |
2341 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2342 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2343 | __do_request(mdsc, req); |
2344 | mutex_unlock(&mdsc->mutex); | |
2345 | goto out; | |
2346 | } | |
2f2dc053 | 2347 | } |
e55b71f8 | 2348 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2349 | } |
2350 | ||
e55b71f8 | 2351 | |
2f2dc053 SW |
2352 | if (head->safe) { |
2353 | req->r_got_safe = true; | |
2354 | __unregister_request(mdsc, req); | |
2f2dc053 SW |
2355 | |
2356 | if (req->r_got_unsafe) { | |
2357 | /* | |
2358 | * We already handled the unsafe response, now do the | |
2359 | * cleanup. No need to examine the response; the MDS | |
2360 | * doesn't include any result info in the safe | |
2361 | * response. And even if it did, there is nothing | |
2362 | * useful we could do with a revised return value. | |
2363 | */ | |
2364 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2365 | list_del_init(&req->r_unsafe_item); | |
2366 | ||
2367 | /* last unsafe request during umount? */ | |
44ca18f2 | 2368 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2369 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2370 | mutex_unlock(&mdsc->mutex); |
2371 | goto out; | |
2372 | } | |
e1518c7c | 2373 | } else { |
2f2dc053 SW |
2374 | req->r_got_unsafe = true; |
2375 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
2376 | } | |
2377 | ||
2378 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2379 | rinfo = &req->r_reply_info; | |
14303d20 | 2380 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2381 | mutex_unlock(&mdsc->mutex); |
2382 | ||
2383 | mutex_lock(&session->s_mutex); | |
2384 | if (err < 0) { | |
25933abd | 2385 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2386 | ceph_msg_dump(msg); |
2f2dc053 SW |
2387 | goto out_err; |
2388 | } | |
2389 | ||
2390 | /* snap trace */ | |
2391 | if (rinfo->snapblob_len) { | |
2392 | down_write(&mdsc->snap_rwsem); | |
2393 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
2394 | rinfo->snapblob + rinfo->snapblob_len, | |
2395 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
2396 | downgrade_write(&mdsc->snap_rwsem); | |
2397 | } else { | |
2398 | down_read(&mdsc->snap_rwsem); | |
2399 | } | |
2400 | ||
2401 | /* insert trace into our cache */ | |
b4556396 | 2402 | mutex_lock(&req->r_fill_mutex); |
3d14c5d2 | 2403 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2404 | if (err == 0) { |
6e8575fa | 2405 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2406 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2407 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2408 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2409 | } |
b4556396 | 2410 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2411 | |
2412 | up_read(&mdsc->snap_rwsem); | |
2413 | out_err: | |
e1518c7c SW |
2414 | mutex_lock(&mdsc->mutex); |
2415 | if (!req->r_aborted) { | |
2416 | if (err) { | |
2417 | req->r_err = err; | |
2418 | } else { | |
2419 | req->r_reply = msg; | |
2420 | ceph_msg_get(msg); | |
2421 | req->r_got_result = true; | |
2422 | } | |
2f2dc053 | 2423 | } else { |
e1518c7c | 2424 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2425 | } |
e1518c7c | 2426 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2427 | |
ee6b272b | 2428 | ceph_add_cap_releases(mdsc, req->r_session); |
2f2dc053 SW |
2429 | mutex_unlock(&session->s_mutex); |
2430 | ||
2431 | /* kick calling process */ | |
2432 | complete_request(mdsc, req); | |
2433 | out: | |
2434 | ceph_mdsc_put_request(req); | |
2435 | return; | |
2436 | } | |
2437 | ||
2438 | ||
2439 | ||
2440 | /* | |
2441 | * handle mds notification that our request has been forwarded. | |
2442 | */ | |
2600d2dd SW |
2443 | static void handle_forward(struct ceph_mds_client *mdsc, |
2444 | struct ceph_mds_session *session, | |
2445 | struct ceph_msg *msg) | |
2f2dc053 SW |
2446 | { |
2447 | struct ceph_mds_request *req; | |
a1ea787c | 2448 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2449 | u32 next_mds; |
2450 | u32 fwd_seq; | |
2f2dc053 SW |
2451 | int err = -EINVAL; |
2452 | void *p = msg->front.iov_base; | |
2453 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2454 | |
a1ea787c | 2455 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2456 | next_mds = ceph_decode_32(&p); |
2457 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2458 | |
2459 | mutex_lock(&mdsc->mutex); | |
2460 | req = __lookup_request(mdsc, tid); | |
2461 | if (!req) { | |
2a8e5e36 | 2462 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2463 | goto out; /* dup reply? */ |
2464 | } | |
2465 | ||
2a8e5e36 SW |
2466 | if (req->r_aborted) { |
2467 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2468 | __unregister_request(mdsc, req); | |
2469 | } else if (fwd_seq <= req->r_num_fwd) { | |
2470 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2471 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2472 | } else { | |
2473 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2474 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2475 | BUG_ON(req->r_err); | |
2476 | BUG_ON(req->r_got_result); | |
2f2dc053 SW |
2477 | req->r_num_fwd = fwd_seq; |
2478 | req->r_resend_mds = next_mds; | |
2479 | put_request_session(req); | |
2480 | __do_request(mdsc, req); | |
2481 | } | |
2482 | ceph_mdsc_put_request(req); | |
2483 | out: | |
2484 | mutex_unlock(&mdsc->mutex); | |
2485 | return; | |
2486 | ||
2487 | bad: | |
2488 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2489 | } | |
2490 | ||
2491 | /* | |
2492 | * handle a mds session control message | |
2493 | */ | |
2494 | static void handle_session(struct ceph_mds_session *session, | |
2495 | struct ceph_msg *msg) | |
2496 | { | |
2497 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2498 | u32 op; | |
2499 | u64 seq; | |
2600d2dd | 2500 | int mds = session->s_mds; |
2f2dc053 SW |
2501 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2502 | int wake = 0; | |
2503 | ||
2f2dc053 SW |
2504 | /* decode */ |
2505 | if (msg->front.iov_len != sizeof(*h)) | |
2506 | goto bad; | |
2507 | op = le32_to_cpu(h->op); | |
2508 | seq = le64_to_cpu(h->seq); | |
2509 | ||
2510 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2511 | if (op == CEPH_SESSION_CLOSE) |
2512 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2513 | /* FIXME: this ttl calculation is generous */ |
2514 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2515 | mutex_unlock(&mdsc->mutex); | |
2516 | ||
2517 | mutex_lock(&session->s_mutex); | |
2518 | ||
2519 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2520 | mds, ceph_session_op_name(op), session, | |
a687ecaf | 2521 | ceph_session_state_name(session->s_state), seq); |
2f2dc053 SW |
2522 | |
2523 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2524 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2525 | pr_info("mds%d came back\n", session->s_mds); | |
2526 | } | |
2527 | ||
2528 | switch (op) { | |
2529 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2530 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2531 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2532 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2533 | renewed_caps(mdsc, session, 0); | |
2534 | wake = 1; | |
2535 | if (mdsc->stopping) | |
2536 | __close_session(mdsc, session); | |
2537 | break; | |
2538 | ||
2539 | case CEPH_SESSION_RENEWCAPS: | |
2540 | if (session->s_renew_seq == seq) | |
2541 | renewed_caps(mdsc, session, 1); | |
2542 | break; | |
2543 | ||
2544 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2545 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2546 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 | 2547 | remove_session_caps(session); |
656e4382 | 2548 | wake = 2; /* for good measure */ |
f3c60c59 | 2549 | wake_up_all(&mdsc->session_close_wq); |
2f2dc053 SW |
2550 | break; |
2551 | ||
2552 | case CEPH_SESSION_STALE: | |
2553 | pr_info("mds%d caps went stale, renewing\n", | |
2554 | session->s_mds); | |
d8fb02ab | 2555 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2556 | session->s_cap_gen++; |
1ce208a6 | 2557 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2558 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2559 | send_renew_caps(mdsc, session); |
2560 | break; | |
2561 | ||
2562 | case CEPH_SESSION_RECALL_STATE: | |
2563 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2564 | break; | |
2565 | ||
186e4f7a YZ |
2566 | case CEPH_SESSION_FLUSHMSG: |
2567 | send_flushmsg_ack(mdsc, session, seq); | |
2568 | break; | |
2569 | ||
2f2dc053 SW |
2570 | default: |
2571 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2572 | WARN_ON(1); | |
2573 | } | |
2574 | ||
2575 | mutex_unlock(&session->s_mutex); | |
2576 | if (wake) { | |
2577 | mutex_lock(&mdsc->mutex); | |
2578 | __wake_requests(mdsc, &session->s_waiting); | |
656e4382 YZ |
2579 | if (wake == 2) |
2580 | kick_requests(mdsc, mds); | |
2f2dc053 SW |
2581 | mutex_unlock(&mdsc->mutex); |
2582 | } | |
2583 | return; | |
2584 | ||
2585 | bad: | |
2586 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2587 | (int)msg->front.iov_len); | |
9ec7cab1 | 2588 | ceph_msg_dump(msg); |
2f2dc053 SW |
2589 | return; |
2590 | } | |
2591 | ||
2592 | ||
2593 | /* | |
2594 | * called under session->mutex. | |
2595 | */ | |
2596 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2597 | struct ceph_mds_session *session) | |
2598 | { | |
2599 | struct ceph_mds_request *req, *nreq; | |
2600 | int err; | |
2601 | ||
2602 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2603 | ||
2604 | mutex_lock(&mdsc->mutex); | |
2605 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2606 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2607 | if (!err) { | |
2608 | ceph_msg_get(req->r_request); | |
2609 | ceph_con_send(&session->s_con, req->r_request); | |
2610 | } | |
2611 | } | |
2612 | mutex_unlock(&mdsc->mutex); | |
2613 | } | |
2614 | ||
2615 | /* | |
2616 | * Encode information about a cap for a reconnect with the MDS. | |
2617 | */ | |
2f2dc053 SW |
2618 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2619 | void *arg) | |
2620 | { | |
20cb34ae SW |
2621 | union { |
2622 | struct ceph_mds_cap_reconnect v2; | |
2623 | struct ceph_mds_cap_reconnect_v1 v1; | |
2624 | } rec; | |
2625 | size_t reclen; | |
2f2dc053 | 2626 | struct ceph_inode_info *ci; |
20cb34ae SW |
2627 | struct ceph_reconnect_state *recon_state = arg; |
2628 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2629 | char *path; |
2630 | int pathlen, err; | |
2631 | u64 pathbase; | |
2632 | struct dentry *dentry; | |
2633 | ||
2634 | ci = cap->ci; | |
2635 | ||
2636 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2637 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2638 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2639 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2640 | if (err) | |
2641 | return err; | |
2f2dc053 SW |
2642 | |
2643 | dentry = d_find_alias(inode); | |
2644 | if (dentry) { | |
2645 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2646 | if (IS_ERR(path)) { | |
2647 | err = PTR_ERR(path); | |
e072f8aa | 2648 | goto out_dput; |
2f2dc053 SW |
2649 | } |
2650 | } else { | |
2651 | path = NULL; | |
2652 | pathlen = 0; | |
2653 | } | |
93cea5be SW |
2654 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2655 | if (err) | |
e072f8aa | 2656 | goto out_free; |
2f2dc053 | 2657 | |
be655596 | 2658 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2659 | cap->seq = 0; /* reset cap seq */ |
2660 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2661 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2662 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae SW |
2663 | |
2664 | if (recon_state->flock) { | |
2665 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); | |
2666 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2667 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2668 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2669 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2670 | rec.v2.flock_len = 0; | |
2671 | reclen = sizeof(rec.v2); | |
2672 | } else { | |
2673 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2674 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2675 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2676 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2677 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2678 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2679 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2680 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
2681 | reclen = sizeof(rec.v1); | |
2682 | } | |
be655596 | 2683 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2684 | |
40819f6f GF |
2685 | if (recon_state->flock) { |
2686 | int num_fcntl_locks, num_flock_locks; | |
39be95e9 JS |
2687 | struct ceph_filelock *flocks; |
2688 | ||
2689 | encode_again: | |
1c8c601a | 2690 | spin_lock(&inode->i_lock); |
39be95e9 | 2691 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); |
1c8c601a | 2692 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2693 | flocks = kmalloc((num_fcntl_locks+num_flock_locks) * |
2694 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2695 | if (!flocks) { | |
2696 | err = -ENOMEM; | |
2697 | goto out_free; | |
2698 | } | |
1c8c601a | 2699 | spin_lock(&inode->i_lock); |
39be95e9 JS |
2700 | err = ceph_encode_locks_to_buffer(inode, flocks, |
2701 | num_fcntl_locks, | |
2702 | num_flock_locks); | |
1c8c601a | 2703 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2704 | if (err) { |
2705 | kfree(flocks); | |
2706 | if (err == -ENOSPC) | |
2707 | goto encode_again; | |
2708 | goto out_free; | |
2709 | } | |
2710 | /* | |
2711 | * number of encoded locks is stable, so copy to pagelist | |
2712 | */ | |
2713 | rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + | |
2714 | (num_fcntl_locks+num_flock_locks) * | |
2715 | sizeof(struct ceph_filelock)); | |
2716 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
2717 | if (!err) | |
2718 | err = ceph_locks_to_pagelist(flocks, pagelist, | |
2719 | num_fcntl_locks, | |
2720 | num_flock_locks); | |
2721 | kfree(flocks); | |
3612abbd SW |
2722 | } else { |
2723 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
40819f6f | 2724 | } |
44c99757 YZ |
2725 | |
2726 | recon_state->nr_caps++; | |
e072f8aa | 2727 | out_free: |
2f2dc053 | 2728 | kfree(path); |
e072f8aa | 2729 | out_dput: |
2f2dc053 | 2730 | dput(dentry); |
93cea5be | 2731 | return err; |
2f2dc053 SW |
2732 | } |
2733 | ||
2734 | ||
2735 | /* | |
2736 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2737 | * reestablish shared state. This includes all caps issued through | |
2738 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2739 | * clear which snap realms the mds cares about, we send everything we | |
2740 | * know about.. that ensures we'll then get any new info the | |
2741 | * recovering MDS might have. | |
2742 | * | |
2743 | * This is a relatively heavyweight operation, but it's rare. | |
2744 | * | |
2745 | * called with mdsc->mutex held. | |
2746 | */ | |
34b6c855 SW |
2747 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2748 | struct ceph_mds_session *session) | |
2f2dc053 | 2749 | { |
2f2dc053 | 2750 | struct ceph_msg *reply; |
a105f00c | 2751 | struct rb_node *p; |
34b6c855 | 2752 | int mds = session->s_mds; |
9abf82b8 | 2753 | int err = -ENOMEM; |
44c99757 | 2754 | int s_nr_caps; |
93cea5be | 2755 | struct ceph_pagelist *pagelist; |
20cb34ae | 2756 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2757 | |
34b6c855 | 2758 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2759 | |
93cea5be SW |
2760 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2761 | if (!pagelist) | |
2762 | goto fail_nopagelist; | |
2763 | ceph_pagelist_init(pagelist); | |
2764 | ||
b61c2763 | 2765 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 2766 | if (!reply) |
93cea5be | 2767 | goto fail_nomsg; |
93cea5be | 2768 | |
34b6c855 SW |
2769 | mutex_lock(&session->s_mutex); |
2770 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2771 | session->s_seq = 0; | |
2f2dc053 | 2772 | |
2f2dc053 | 2773 | dout("session %p state %s\n", session, |
a687ecaf | 2774 | ceph_session_state_name(session->s_state)); |
2f2dc053 | 2775 | |
99a9c273 YZ |
2776 | spin_lock(&session->s_gen_ttl_lock); |
2777 | session->s_cap_gen++; | |
2778 | spin_unlock(&session->s_gen_ttl_lock); | |
2779 | ||
2780 | spin_lock(&session->s_cap_lock); | |
2781 | /* | |
2782 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
2783 | * If a cap get released before being added to the cap reconnect, | |
2784 | * __ceph_remove_cap() should skip queuing cap release. | |
2785 | */ | |
2786 | session->s_cap_reconnect = 1; | |
e01a5946 SW |
2787 | /* drop old cap expires; we're about to reestablish that state */ |
2788 | discard_cap_releases(mdsc, session); | |
99a9c273 | 2789 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 2790 | |
5d23371f YZ |
2791 | /* trim unused caps to reduce MDS's cache rejoin time */ |
2792 | shrink_dcache_parent(mdsc->fsc->sb->s_root); | |
2793 | ||
2794 | ceph_con_close(&session->s_con); | |
2795 | ceph_con_open(&session->s_con, | |
2796 | CEPH_ENTITY_TYPE_MDS, mds, | |
2797 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
2798 | ||
2799 | /* replay unsafe requests */ | |
2800 | replay_unsafe_requests(mdsc, session); | |
2801 | ||
2802 | down_read(&mdsc->snap_rwsem); | |
2803 | ||
2f2dc053 | 2804 | /* traverse this session's caps */ |
44c99757 YZ |
2805 | s_nr_caps = session->s_nr_caps; |
2806 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
2807 | if (err) |
2808 | goto fail; | |
20cb34ae | 2809 | |
44c99757 | 2810 | recon_state.nr_caps = 0; |
20cb34ae SW |
2811 | recon_state.pagelist = pagelist; |
2812 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; | |
2813 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); | |
2f2dc053 | 2814 | if (err < 0) |
9abf82b8 | 2815 | goto fail; |
2f2dc053 | 2816 | |
99a9c273 YZ |
2817 | spin_lock(&session->s_cap_lock); |
2818 | session->s_cap_reconnect = 0; | |
2819 | spin_unlock(&session->s_cap_lock); | |
2820 | ||
2f2dc053 SW |
2821 | /* |
2822 | * snaprealms. we provide mds with the ino, seq (version), and | |
2823 | * parent for all of our realms. If the mds has any newer info, | |
2824 | * it will tell us. | |
2825 | */ | |
a105f00c SW |
2826 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2827 | struct ceph_snap_realm *realm = | |
2828 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2829 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2830 | |
2831 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2832 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2833 | sr_rec.ino = cpu_to_le64(realm->ino); |
2834 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2835 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2836 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2837 | if (err) | |
2838 | goto fail; | |
2f2dc053 | 2839 | } |
2f2dc053 | 2840 | |
20cb34ae SW |
2841 | if (recon_state.flock) |
2842 | reply->hdr.version = cpu_to_le16(2); | |
44c99757 YZ |
2843 | |
2844 | /* raced with cap release? */ | |
2845 | if (s_nr_caps != recon_state.nr_caps) { | |
2846 | struct page *page = list_first_entry(&pagelist->head, | |
2847 | struct page, lru); | |
2848 | __le32 *addr = kmap_atomic(page); | |
2849 | *addr = cpu_to_le32(recon_state.nr_caps); | |
2850 | kunmap_atomic(addr); | |
ebf18f47 | 2851 | } |
44c99757 YZ |
2852 | |
2853 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
2854 | ceph_msg_data_add_pagelist(reply, pagelist); | |
2f2dc053 SW |
2855 | ceph_con_send(&session->s_con, reply); |
2856 | ||
9abf82b8 SW |
2857 | mutex_unlock(&session->s_mutex); |
2858 | ||
2859 | mutex_lock(&mdsc->mutex); | |
2860 | __wake_requests(mdsc, &session->s_waiting); | |
2861 | mutex_unlock(&mdsc->mutex); | |
2862 | ||
2f2dc053 | 2863 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2864 | return; |
2865 | ||
93cea5be | 2866 | fail: |
2f2dc053 | 2867 | ceph_msg_put(reply); |
9abf82b8 SW |
2868 | up_read(&mdsc->snap_rwsem); |
2869 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
2870 | fail_nomsg: |
2871 | ceph_pagelist_release(pagelist); | |
93cea5be | 2872 | fail_nopagelist: |
9abf82b8 | 2873 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 2874 | return; |
2f2dc053 SW |
2875 | } |
2876 | ||
2877 | ||
2878 | /* | |
2879 | * compare old and new mdsmaps, kicking requests | |
2880 | * and closing out old connections as necessary | |
2881 | * | |
2882 | * called under mdsc->mutex. | |
2883 | */ | |
2884 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2885 | struct ceph_mdsmap *newmap, | |
2886 | struct ceph_mdsmap *oldmap) | |
2887 | { | |
2888 | int i; | |
2889 | int oldstate, newstate; | |
2890 | struct ceph_mds_session *s; | |
2891 | ||
2892 | dout("check_new_map new %u old %u\n", | |
2893 | newmap->m_epoch, oldmap->m_epoch); | |
2894 | ||
2895 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2896 | if (mdsc->sessions[i] == NULL) | |
2897 | continue; | |
2898 | s = mdsc->sessions[i]; | |
2899 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2900 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2901 | ||
0deb01c9 | 2902 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 2903 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 2904 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 2905 | ceph_mds_state_name(newstate), |
0deb01c9 | 2906 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
a687ecaf | 2907 | ceph_session_state_name(s->s_state)); |
2f2dc053 | 2908 | |
3e8f43a0 YZ |
2909 | if (i >= newmap->m_max_mds || |
2910 | memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2f2dc053 SW |
2911 | ceph_mdsmap_get_addr(newmap, i), |
2912 | sizeof(struct ceph_entity_addr))) { | |
2913 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2914 | /* the session never opened, just close it | |
2915 | * out now */ | |
2916 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2917 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2918 | } else { |
2919 | /* just close it */ | |
2920 | mutex_unlock(&mdsc->mutex); | |
2921 | mutex_lock(&s->s_mutex); | |
2922 | mutex_lock(&mdsc->mutex); | |
2923 | ceph_con_close(&s->s_con); | |
2924 | mutex_unlock(&s->s_mutex); | |
2925 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2926 | } | |
2927 | ||
2928 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2929 | kick_requests(mdsc, i); |
2f2dc053 SW |
2930 | } else if (oldstate == newstate) { |
2931 | continue; /* nothing new with this mds */ | |
2932 | } | |
2933 | ||
2934 | /* | |
2935 | * send reconnect? | |
2936 | */ | |
2937 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
2938 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
2939 | mutex_unlock(&mdsc->mutex); | |
2940 | send_mds_reconnect(mdsc, s); | |
2941 | mutex_lock(&mdsc->mutex); | |
2942 | } | |
2f2dc053 SW |
2943 | |
2944 | /* | |
29790f26 | 2945 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2946 | */ |
2947 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2948 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2949 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2950 | oldstate != CEPH_MDS_STATE_STARTING) | |
2951 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2952 | kick_requests(mdsc, i); | |
2f2dc053 | 2953 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2954 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2955 | } |
2956 | } | |
cb170a22 SW |
2957 | |
2958 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2959 | s = mdsc->sessions[i]; | |
2960 | if (!s) | |
2961 | continue; | |
2962 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
2963 | continue; | |
2964 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
2965 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
2966 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2967 | dout(" connecting to export targets of laggy mds%d\n", | |
2968 | i); | |
2969 | __open_export_target_sessions(mdsc, s); | |
2970 | } | |
2971 | } | |
2f2dc053 SW |
2972 | } |
2973 | ||
2974 | ||
2975 | ||
2976 | /* | |
2977 | * leases | |
2978 | */ | |
2979 | ||
2980 | /* | |
2981 | * caller must hold session s_mutex, dentry->d_lock | |
2982 | */ | |
2983 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2984 | { | |
2985 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2986 | ||
2987 | ceph_put_mds_session(di->lease_session); | |
2988 | di->lease_session = NULL; | |
2989 | } | |
2990 | ||
2600d2dd SW |
2991 | static void handle_lease(struct ceph_mds_client *mdsc, |
2992 | struct ceph_mds_session *session, | |
2993 | struct ceph_msg *msg) | |
2f2dc053 | 2994 | { |
3d14c5d2 | 2995 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 2996 | struct inode *inode; |
2f2dc053 SW |
2997 | struct dentry *parent, *dentry; |
2998 | struct ceph_dentry_info *di; | |
2600d2dd | 2999 | int mds = session->s_mds; |
2f2dc053 | 3000 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 3001 | u32 seq; |
2f2dc053 | 3002 | struct ceph_vino vino; |
2f2dc053 SW |
3003 | struct qstr dname; |
3004 | int release = 0; | |
3005 | ||
2f2dc053 SW |
3006 | dout("handle_lease from mds%d\n", mds); |
3007 | ||
3008 | /* decode */ | |
3009 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
3010 | goto bad; | |
3011 | vino.ino = le64_to_cpu(h->ino); | |
3012 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 3013 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
3014 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
3015 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
3016 | if (dname.len != get_unaligned_le32(h+1)) | |
3017 | goto bad; | |
3018 | ||
2f2dc053 SW |
3019 | /* lookup inode */ |
3020 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
3021 | dout("handle_lease %s, ino %llx %p %.*s\n", |
3022 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 3023 | dname.len, dname.name); |
6cd3bcad YZ |
3024 | |
3025 | mutex_lock(&session->s_mutex); | |
3026 | session->s_seq++; | |
3027 | ||
2f2dc053 SW |
3028 | if (inode == NULL) { |
3029 | dout("handle_lease no inode %llx\n", vino.ino); | |
3030 | goto release; | |
3031 | } | |
2f2dc053 SW |
3032 | |
3033 | /* dentry */ | |
3034 | parent = d_find_alias(inode); | |
3035 | if (!parent) { | |
3036 | dout("no parent dentry on inode %p\n", inode); | |
3037 | WARN_ON(1); | |
3038 | goto release; /* hrm... */ | |
3039 | } | |
3040 | dname.hash = full_name_hash(dname.name, dname.len); | |
3041 | dentry = d_lookup(parent, &dname); | |
3042 | dput(parent); | |
3043 | if (!dentry) | |
3044 | goto release; | |
3045 | ||
3046 | spin_lock(&dentry->d_lock); | |
3047 | di = ceph_dentry(dentry); | |
3048 | switch (h->action) { | |
3049 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 3050 | if (di->lease_session == session) { |
1e5ea23d SW |
3051 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
3052 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
3053 | __ceph_mdsc_drop_dentry_lease(dentry); |
3054 | } | |
3055 | release = 1; | |
3056 | break; | |
3057 | ||
3058 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 3059 | if (di->lease_session == session && |
2f2dc053 SW |
3060 | di->lease_gen == session->s_cap_gen && |
3061 | di->lease_renew_from && | |
3062 | di->lease_renew_after == 0) { | |
3063 | unsigned long duration = | |
3064 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
3065 | ||
1e5ea23d | 3066 | di->lease_seq = seq; |
2f2dc053 SW |
3067 | dentry->d_time = di->lease_renew_from + duration; |
3068 | di->lease_renew_after = di->lease_renew_from + | |
3069 | (duration >> 1); | |
3070 | di->lease_renew_from = 0; | |
3071 | } | |
3072 | break; | |
3073 | } | |
3074 | spin_unlock(&dentry->d_lock); | |
3075 | dput(dentry); | |
3076 | ||
3077 | if (!release) | |
3078 | goto out; | |
3079 | ||
3080 | release: | |
3081 | /* let's just reuse the same message */ | |
3082 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
3083 | ceph_msg_get(msg); | |
3084 | ceph_con_send(&session->s_con, msg); | |
3085 | ||
3086 | out: | |
3087 | iput(inode); | |
3088 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
3089 | return; |
3090 | ||
3091 | bad: | |
3092 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 3093 | ceph_msg_dump(msg); |
2f2dc053 SW |
3094 | } |
3095 | ||
3096 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
3097 | struct inode *inode, | |
3098 | struct dentry *dentry, char action, | |
3099 | u32 seq) | |
3100 | { | |
3101 | struct ceph_msg *msg; | |
3102 | struct ceph_mds_lease *lease; | |
3103 | int len = sizeof(*lease) + sizeof(u32); | |
3104 | int dnamelen = 0; | |
3105 | ||
3106 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
3107 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
3108 | dnamelen = dentry->d_name.len; | |
3109 | len += dnamelen; | |
3110 | ||
b61c2763 | 3111 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 3112 | if (!msg) |
2f2dc053 SW |
3113 | return; |
3114 | lease = msg->front.iov_base; | |
3115 | lease->action = action; | |
2f2dc053 SW |
3116 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
3117 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
3118 | lease->seq = cpu_to_le32(seq); | |
3119 | put_unaligned_le32(dnamelen, lease + 1); | |
3120 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
3121 | ||
3122 | /* | |
3123 | * if this is a preemptive lease RELEASE, no need to | |
3124 | * flush request stream, since the actual request will | |
3125 | * soon follow. | |
3126 | */ | |
3127 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
3128 | ||
3129 | ceph_con_send(&session->s_con, msg); | |
3130 | } | |
3131 | ||
3132 | /* | |
3133 | * Preemptively release a lease we expect to invalidate anyway. | |
3134 | * Pass @inode always, @dentry is optional. | |
3135 | */ | |
3136 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2f90b852 | 3137 | struct dentry *dentry) |
2f2dc053 SW |
3138 | { |
3139 | struct ceph_dentry_info *di; | |
3140 | struct ceph_mds_session *session; | |
3141 | u32 seq; | |
3142 | ||
3143 | BUG_ON(inode == NULL); | |
3144 | BUG_ON(dentry == NULL); | |
2f2dc053 SW |
3145 | |
3146 | /* is dentry lease valid? */ | |
3147 | spin_lock(&dentry->d_lock); | |
3148 | di = ceph_dentry(dentry); | |
3149 | if (!di || !di->lease_session || | |
3150 | di->lease_session->s_mds < 0 || | |
3151 | di->lease_gen != di->lease_session->s_cap_gen || | |
3152 | !time_before(jiffies, dentry->d_time)) { | |
3153 | dout("lease_release inode %p dentry %p -- " | |
2f90b852 SW |
3154 | "no lease\n", |
3155 | inode, dentry); | |
2f2dc053 SW |
3156 | spin_unlock(&dentry->d_lock); |
3157 | return; | |
3158 | } | |
3159 | ||
3160 | /* we do have a lease on this dentry; note mds and seq */ | |
3161 | session = ceph_get_mds_session(di->lease_session); | |
3162 | seq = di->lease_seq; | |
3163 | __ceph_mdsc_drop_dentry_lease(dentry); | |
3164 | spin_unlock(&dentry->d_lock); | |
3165 | ||
2f90b852 SW |
3166 | dout("lease_release inode %p dentry %p to mds%d\n", |
3167 | inode, dentry, session->s_mds); | |
2f2dc053 SW |
3168 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
3169 | CEPH_MDS_LEASE_RELEASE, seq); | |
3170 | ceph_put_mds_session(session); | |
3171 | } | |
3172 | ||
3173 | /* | |
3174 | * drop all leases (and dentry refs) in preparation for umount | |
3175 | */ | |
3176 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3177 | { | |
3178 | int i; | |
3179 | ||
3180 | dout("drop_leases\n"); | |
3181 | mutex_lock(&mdsc->mutex); | |
3182 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3183 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3184 | if (!s) | |
3185 | continue; | |
3186 | mutex_unlock(&mdsc->mutex); | |
3187 | mutex_lock(&s->s_mutex); | |
3188 | mutex_unlock(&s->s_mutex); | |
3189 | ceph_put_mds_session(s); | |
3190 | mutex_lock(&mdsc->mutex); | |
3191 | } | |
3192 | mutex_unlock(&mdsc->mutex); | |
3193 | } | |
3194 | ||
3195 | ||
3196 | ||
3197 | /* | |
3198 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3199 | */ | |
3200 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3201 | { | |
3202 | int delay = 5; | |
3203 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3204 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3205 | } | |
3206 | ||
3207 | static void delayed_work(struct work_struct *work) | |
3208 | { | |
3209 | int i; | |
3210 | struct ceph_mds_client *mdsc = | |
3211 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3212 | int renew_interval; | |
3213 | int renew_caps; | |
3214 | ||
3215 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3216 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3217 | |
3218 | mutex_lock(&mdsc->mutex); | |
3219 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3220 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3221 | mdsc->last_renew_caps); | |
3222 | if (renew_caps) | |
3223 | mdsc->last_renew_caps = jiffies; | |
3224 | ||
3225 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3226 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3227 | if (s == NULL) | |
3228 | continue; | |
3229 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3230 | dout("resending session close request for mds%d\n", | |
3231 | s->s_mds); | |
3232 | request_close_session(mdsc, s); | |
3233 | ceph_put_mds_session(s); | |
3234 | continue; | |
3235 | } | |
3236 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3237 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3238 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3239 | pr_info("mds%d hung\n", s->s_mds); | |
3240 | } | |
3241 | } | |
3242 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3243 | /* this mds is failed or recovering, just wait */ | |
3244 | ceph_put_mds_session(s); | |
3245 | continue; | |
3246 | } | |
3247 | mutex_unlock(&mdsc->mutex); | |
3248 | ||
3249 | mutex_lock(&s->s_mutex); | |
3250 | if (renew_caps) | |
3251 | send_renew_caps(mdsc, s); | |
3252 | else | |
3253 | ceph_con_keepalive(&s->s_con); | |
ee6b272b | 3254 | ceph_add_cap_releases(mdsc, s); |
aab53dd9 SW |
3255 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3256 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3257 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3258 | mutex_unlock(&s->s_mutex); |
3259 | ceph_put_mds_session(s); | |
3260 | ||
3261 | mutex_lock(&mdsc->mutex); | |
3262 | } | |
3263 | mutex_unlock(&mdsc->mutex); | |
3264 | ||
3265 | schedule_delayed(mdsc); | |
3266 | } | |
3267 | ||
3d14c5d2 | 3268 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3269 | |
2f2dc053 | 3270 | { |
3d14c5d2 YS |
3271 | struct ceph_mds_client *mdsc; |
3272 | ||
3273 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3274 | if (!mdsc) | |
3275 | return -ENOMEM; | |
3276 | mdsc->fsc = fsc; | |
3277 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3278 | mutex_init(&mdsc->mutex); |
3279 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
fb3101b6 | 3280 | if (mdsc->mdsmap == NULL) { |
3281 | kfree(mdsc); | |
2d06eeb8 | 3282 | return -ENOMEM; |
fb3101b6 | 3283 | } |
2d06eeb8 | 3284 | |
2f2dc053 | 3285 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3286 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3287 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3288 | mdsc->sessions = NULL; | |
3289 | mdsc->max_sessions = 0; | |
3290 | mdsc->stopping = 0; | |
3291 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 3292 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3293 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3294 | spin_lock_init(&mdsc->snap_empty_lock); | |
3295 | mdsc->last_tid = 0; | |
44ca18f2 | 3296 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3297 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3298 | mdsc->last_renew_caps = jiffies; | |
3299 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3300 | spin_lock_init(&mdsc->cap_delay_lock); | |
3301 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3302 | spin_lock_init(&mdsc->snap_flush_lock); | |
3303 | mdsc->cap_flush_seq = 0; | |
3304 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
db354052 | 3305 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3306 | mdsc->num_cap_flushing = 0; |
3307 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3308 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3309 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3310 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3311 | |
37151668 | 3312 | ceph_caps_init(mdsc); |
3d14c5d2 | 3313 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3314 | |
5f44f142 | 3315 | return 0; |
2f2dc053 SW |
3316 | } |
3317 | ||
3318 | /* | |
3319 | * Wait for safe replies on open mds requests. If we time out, drop | |
3320 | * all requests from the tree to avoid dangling dentry refs. | |
3321 | */ | |
3322 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3323 | { | |
3324 | struct ceph_mds_request *req; | |
3d14c5d2 | 3325 | struct ceph_fs_client *fsc = mdsc->fsc; |
2f2dc053 SW |
3326 | |
3327 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3328 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3329 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3330 | |
2f2dc053 SW |
3331 | dout("wait_requests waiting for requests\n"); |
3332 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
3d14c5d2 | 3333 | fsc->client->options->mount_timeout * HZ); |
2f2dc053 SW |
3334 | |
3335 | /* tear down remaining requests */ | |
44ca18f2 SW |
3336 | mutex_lock(&mdsc->mutex); |
3337 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3338 | dout("wait_requests timed out on tid %llu\n", |
3339 | req->r_tid); | |
44ca18f2 | 3340 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3341 | } |
3342 | } | |
3343 | mutex_unlock(&mdsc->mutex); | |
3344 | dout("wait_requests done\n"); | |
3345 | } | |
3346 | ||
3347 | /* | |
3348 | * called before mount is ro, and before dentries are torn down. | |
3349 | * (hmm, does this still race with new lookups?) | |
3350 | */ | |
3351 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3352 | { | |
3353 | dout("pre_umount\n"); | |
3354 | mdsc->stopping = 1; | |
3355 | ||
3356 | drop_leases(mdsc); | |
afcdaea3 | 3357 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3358 | wait_requests(mdsc); |
17c688c3 SW |
3359 | |
3360 | /* | |
3361 | * wait for reply handlers to drop their request refs and | |
3362 | * their inode/dcache refs | |
3363 | */ | |
3364 | ceph_msgr_flush(); | |
2f2dc053 SW |
3365 | } |
3366 | ||
3367 | /* | |
3368 | * wait for all write mds requests to flush. | |
3369 | */ | |
3370 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3371 | { | |
80fc7314 | 3372 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3373 | struct rb_node *n; |
2f2dc053 SW |
3374 | |
3375 | mutex_lock(&mdsc->mutex); | |
3376 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3377 | restart: |
44ca18f2 SW |
3378 | req = __get_oldest_req(mdsc); |
3379 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3380 | /* find next request */ |
3381 | n = rb_next(&req->r_node); | |
3382 | if (n) | |
3383 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3384 | else | |
3385 | nextreq = NULL; | |
44ca18f2 SW |
3386 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
3387 | /* write op */ | |
3388 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3389 | if (nextreq) |
3390 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3391 | mutex_unlock(&mdsc->mutex); |
3392 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3393 | req->r_tid, want_tid); | |
3394 | wait_for_completion(&req->r_safe_completion); | |
3395 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3396 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3397 | if (!nextreq) |
3398 | break; /* next dne before, so we're done! */ | |
3399 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3400 | /* next request was removed from tree */ | |
3401 | ceph_mdsc_put_request(nextreq); | |
3402 | goto restart; | |
3403 | } | |
3404 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3405 | } |
80fc7314 | 3406 | req = nextreq; |
2f2dc053 SW |
3407 | } |
3408 | mutex_unlock(&mdsc->mutex); | |
3409 | dout("wait_unsafe_requests done\n"); | |
3410 | } | |
3411 | ||
3412 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3413 | { | |
3414 | u64 want_tid, want_flush; | |
3415 | ||
3d14c5d2 | 3416 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3417 | return; |
3418 | ||
2f2dc053 SW |
3419 | dout("sync\n"); |
3420 | mutex_lock(&mdsc->mutex); | |
3421 | want_tid = mdsc->last_tid; | |
3422 | want_flush = mdsc->cap_flush_seq; | |
3423 | mutex_unlock(&mdsc->mutex); | |
3424 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
3425 | ||
afcdaea3 | 3426 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
3427 | |
3428 | wait_unsafe_requests(mdsc, want_tid); | |
3429 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
3430 | } | |
3431 | ||
f3c60c59 SW |
3432 | /* |
3433 | * true if all sessions are closed, or we force unmount | |
3434 | */ | |
7fd7d101 | 3435 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
f3c60c59 SW |
3436 | { |
3437 | int i, n = 0; | |
3438 | ||
3d14c5d2 | 3439 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 SW |
3440 | return true; |
3441 | ||
3442 | mutex_lock(&mdsc->mutex); | |
3443 | for (i = 0; i < mdsc->max_sessions; i++) | |
3444 | if (mdsc->sessions[i]) | |
3445 | n++; | |
3446 | mutex_unlock(&mdsc->mutex); | |
3447 | return n == 0; | |
3448 | } | |
2f2dc053 SW |
3449 | |
3450 | /* | |
3451 | * called after sb is ro. | |
3452 | */ | |
3453 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3454 | { | |
3455 | struct ceph_mds_session *session; | |
3456 | int i; | |
3d14c5d2 YS |
3457 | struct ceph_fs_client *fsc = mdsc->fsc; |
3458 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; | |
2f2dc053 SW |
3459 | |
3460 | dout("close_sessions\n"); | |
3461 | ||
2f2dc053 | 3462 | /* close sessions */ |
f3c60c59 SW |
3463 | mutex_lock(&mdsc->mutex); |
3464 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3465 | session = __ceph_lookup_mds_session(mdsc, i); | |
3466 | if (!session) | |
3467 | continue; | |
2f2dc053 | 3468 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3469 | mutex_lock(&session->s_mutex); |
3470 | __close_session(mdsc, session); | |
3471 | mutex_unlock(&session->s_mutex); | |
3472 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3473 | mutex_lock(&mdsc->mutex); |
3474 | } | |
f3c60c59 SW |
3475 | mutex_unlock(&mdsc->mutex); |
3476 | ||
3477 | dout("waiting for sessions to close\n"); | |
3478 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
3479 | timeout); | |
2f2dc053 SW |
3480 | |
3481 | /* tear down remaining sessions */ | |
f3c60c59 | 3482 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3483 | for (i = 0; i < mdsc->max_sessions; i++) { |
3484 | if (mdsc->sessions[i]) { | |
3485 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3486 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3487 | mutex_unlock(&mdsc->mutex); |
3488 | mutex_lock(&session->s_mutex); | |
3489 | remove_session_caps(session); | |
3490 | mutex_unlock(&session->s_mutex); | |
3491 | ceph_put_mds_session(session); | |
3492 | mutex_lock(&mdsc->mutex); | |
3493 | } | |
3494 | } | |
2f2dc053 | 3495 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3496 | mutex_unlock(&mdsc->mutex); |
3497 | ||
3498 | ceph_cleanup_empty_realms(mdsc); | |
3499 | ||
3500 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3501 | ||
3502 | dout("stopped\n"); | |
3503 | } | |
3504 | ||
3d14c5d2 | 3505 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3506 | { |
3507 | dout("stop\n"); | |
3508 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3509 | if (mdsc->mdsmap) | |
3510 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3511 | kfree(mdsc->sessions); | |
37151668 | 3512 | ceph_caps_finalize(mdsc); |
2f2dc053 SW |
3513 | } |
3514 | ||
3d14c5d2 YS |
3515 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3516 | { | |
3517 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3518 | ||
ef550f6f | 3519 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3520 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3521 | |
3522 | /* flush out any connection work with references to us */ | |
3523 | ceph_msgr_flush(); | |
3524 | ||
3d14c5d2 YS |
3525 | fsc->mdsc = NULL; |
3526 | kfree(mdsc); | |
ef550f6f | 3527 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3528 | } |
3529 | ||
2f2dc053 SW |
3530 | |
3531 | /* | |
3532 | * handle mds map update. | |
3533 | */ | |
3534 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
3535 | { | |
3536 | u32 epoch; | |
3537 | u32 maplen; | |
3538 | void *p = msg->front.iov_base; | |
3539 | void *end = p + msg->front.iov_len; | |
3540 | struct ceph_mdsmap *newmap, *oldmap; | |
3541 | struct ceph_fsid fsid; | |
3542 | int err = -EINVAL; | |
3543 | ||
3544 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3545 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3546 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3547 | return; |
c89136ea SW |
3548 | epoch = ceph_decode_32(&p); |
3549 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3550 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3551 | ||
3552 | /* do we need it? */ | |
3d14c5d2 | 3553 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
2f2dc053 SW |
3554 | mutex_lock(&mdsc->mutex); |
3555 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3556 | dout("handle_map epoch %u <= our %u\n", | |
3557 | epoch, mdsc->mdsmap->m_epoch); | |
3558 | mutex_unlock(&mdsc->mutex); | |
3559 | return; | |
3560 | } | |
3561 | ||
3562 | newmap = ceph_mdsmap_decode(&p, end); | |
3563 | if (IS_ERR(newmap)) { | |
3564 | err = PTR_ERR(newmap); | |
3565 | goto bad_unlock; | |
3566 | } | |
3567 | ||
3568 | /* swap into place */ | |
3569 | if (mdsc->mdsmap) { | |
3570 | oldmap = mdsc->mdsmap; | |
3571 | mdsc->mdsmap = newmap; | |
3572 | check_new_map(mdsc, newmap, oldmap); | |
3573 | ceph_mdsmap_destroy(oldmap); | |
3574 | } else { | |
3575 | mdsc->mdsmap = newmap; /* first mds map */ | |
3576 | } | |
3d14c5d2 | 3577 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3578 | |
3579 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3580 | ||
3581 | mutex_unlock(&mdsc->mutex); | |
3582 | schedule_delayed(mdsc); | |
3583 | return; | |
3584 | ||
3585 | bad_unlock: | |
3586 | mutex_unlock(&mdsc->mutex); | |
3587 | bad: | |
3588 | pr_err("error decoding mdsmap %d\n", err); | |
3589 | return; | |
3590 | } | |
3591 | ||
3592 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3593 | { | |
3594 | struct ceph_mds_session *s = con->private; | |
3595 | ||
3596 | if (get_session(s)) { | |
2600d2dd | 3597 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3598 | return con; |
3599 | } | |
3600 | dout("mdsc con_get %p FAIL\n", s); | |
3601 | return NULL; | |
3602 | } | |
3603 | ||
3604 | static void con_put(struct ceph_connection *con) | |
3605 | { | |
3606 | struct ceph_mds_session *s = con->private; | |
3607 | ||
7d8e18a6 | 3608 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3609 | ceph_put_mds_session(s); |
3610 | } | |
3611 | ||
3612 | /* | |
3613 | * if the client is unresponsive for long enough, the mds will kill | |
3614 | * the session entirely. | |
3615 | */ | |
3616 | static void peer_reset(struct ceph_connection *con) | |
3617 | { | |
3618 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3619 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3620 | |
f3ae1b97 | 3621 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 3622 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
3623 | } |
3624 | ||
3625 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3626 | { | |
3627 | struct ceph_mds_session *s = con->private; | |
3628 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3629 | int type = le16_to_cpu(msg->hdr.type); | |
3630 | ||
2600d2dd SW |
3631 | mutex_lock(&mdsc->mutex); |
3632 | if (__verify_registered_session(mdsc, s) < 0) { | |
3633 | mutex_unlock(&mdsc->mutex); | |
3634 | goto out; | |
3635 | } | |
3636 | mutex_unlock(&mdsc->mutex); | |
3637 | ||
2f2dc053 SW |
3638 | switch (type) { |
3639 | case CEPH_MSG_MDS_MAP: | |
3640 | ceph_mdsc_handle_map(mdsc, msg); | |
3641 | break; | |
3642 | case CEPH_MSG_CLIENT_SESSION: | |
3643 | handle_session(s, msg); | |
3644 | break; | |
3645 | case CEPH_MSG_CLIENT_REPLY: | |
3646 | handle_reply(s, msg); | |
3647 | break; | |
3648 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3649 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3650 | break; |
3651 | case CEPH_MSG_CLIENT_CAPS: | |
3652 | ceph_handle_caps(s, msg); | |
3653 | break; | |
3654 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3655 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3656 | break; |
3657 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3658 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3659 | break; |
3660 | ||
3661 | default: | |
3662 | pr_err("received unknown message type %d %s\n", type, | |
3663 | ceph_msg_type_name(type)); | |
3664 | } | |
2600d2dd | 3665 | out: |
2f2dc053 SW |
3666 | ceph_msg_put(msg); |
3667 | } | |
3668 | ||
4e7a5dcd SW |
3669 | /* |
3670 | * authentication | |
3671 | */ | |
a3530df3 AE |
3672 | |
3673 | /* | |
3674 | * Note: returned pointer is the address of a structure that's | |
3675 | * managed separately. Caller must *not* attempt to free it. | |
3676 | */ | |
3677 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 3678 | int *proto, int force_new) |
4e7a5dcd SW |
3679 | { |
3680 | struct ceph_mds_session *s = con->private; | |
3681 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3682 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 3683 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 3684 | |
74f1869f | 3685 | if (force_new && auth->authorizer) { |
27859f97 | 3686 | ceph_auth_destroy_authorizer(ac, auth->authorizer); |
74f1869f | 3687 | auth->authorizer = NULL; |
4e7a5dcd | 3688 | } |
27859f97 SW |
3689 | if (!auth->authorizer) { |
3690 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3691 | auth); | |
0bed9b5c SW |
3692 | if (ret) |
3693 | return ERR_PTR(ret); | |
27859f97 SW |
3694 | } else { |
3695 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3696 | auth); | |
a255651d | 3697 | if (ret) |
a3530df3 | 3698 | return ERR_PTR(ret); |
4e7a5dcd | 3699 | } |
4e7a5dcd | 3700 | *proto = ac->protocol; |
74f1869f | 3701 | |
a3530df3 | 3702 | return auth; |
4e7a5dcd SW |
3703 | } |
3704 | ||
3705 | ||
3706 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3707 | { | |
3708 | struct ceph_mds_session *s = con->private; | |
3709 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3710 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 3711 | |
27859f97 | 3712 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); |
4e7a5dcd SW |
3713 | } |
3714 | ||
9bd2e6f8 SW |
3715 | static int invalidate_authorizer(struct ceph_connection *con) |
3716 | { | |
3717 | struct ceph_mds_session *s = con->private; | |
3718 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3719 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 3720 | |
27859f97 | 3721 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 3722 | |
3d14c5d2 | 3723 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3724 | } |
3725 | ||
53ded495 AE |
3726 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
3727 | struct ceph_msg_header *hdr, int *skip) | |
3728 | { | |
3729 | struct ceph_msg *msg; | |
3730 | int type = (int) le16_to_cpu(hdr->type); | |
3731 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
3732 | ||
3733 | if (con->in_msg) | |
3734 | return con->in_msg; | |
3735 | ||
3736 | *skip = 0; | |
3737 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
3738 | if (!msg) { | |
3739 | pr_err("unable to allocate msg type %d len %d\n", | |
3740 | type, front_len); | |
3741 | return NULL; | |
3742 | } | |
53ded495 AE |
3743 | |
3744 | return msg; | |
3745 | } | |
3746 | ||
9e32789f | 3747 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3748 | .get = con_get, |
3749 | .put = con_put, | |
3750 | .dispatch = dispatch, | |
4e7a5dcd SW |
3751 | .get_authorizer = get_authorizer, |
3752 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3753 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3754 | .peer_reset = peer_reset, |
53ded495 | 3755 | .alloc_msg = mds_alloc_msg, |
2f2dc053 SW |
3756 | }; |
3757 | ||
2f2dc053 | 3758 | /* eof */ |