Commit | Line | Data |
---|---|---|
3d14c5d2 | 1 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 | 2 | |
496e5955 | 3 | #include <linux/fs.h> |
2f2dc053 | 4 | #include <linux/wait.h> |
5a0e3ad6 | 5 | #include <linux/slab.h> |
54008399 | 6 | #include <linux/gfp.h> |
2f2dc053 | 7 | #include <linux/sched.h> |
3d14c5d2 YS |
8 | #include <linux/debugfs.h> |
9 | #include <linux/seq_file.h> | |
dbd0c8bf | 10 | #include <linux/utsname.h> |
3e0708b9 | 11 | #include <linux/ratelimit.h> |
2f2dc053 | 12 | |
2f2dc053 | 13 | #include "super.h" |
3d14c5d2 YS |
14 | #include "mds_client.h" |
15 | ||
1fe60e51 | 16 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
17 | #include <linux/ceph/messenger.h> |
18 | #include <linux/ceph/decode.h> | |
19 | #include <linux/ceph/pagelist.h> | |
20 | #include <linux/ceph/auth.h> | |
21 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
22 | |
23 | /* | |
24 | * A cluster of MDS (metadata server) daemons is responsible for | |
25 | * managing the file system namespace (the directory hierarchy and | |
26 | * inodes) and for coordinating shared access to storage. Metadata is | |
27 | * partitioning hierarchically across a number of servers, and that | |
28 | * partition varies over time as the cluster adjusts the distribution | |
29 | * in order to balance load. | |
30 | * | |
31 | * The MDS client is primarily responsible to managing synchronous | |
32 | * metadata requests for operations like open, unlink, and so forth. | |
33 | * If there is a MDS failure, we find out about it when we (possibly | |
34 | * request and) receive a new MDS map, and can resubmit affected | |
35 | * requests. | |
36 | * | |
37 | * For the most part, though, we take advantage of a lossless | |
38 | * communications channel to the MDS, and do not need to worry about | |
39 | * timing out or resubmitting requests. | |
40 | * | |
41 | * We maintain a stateful "session" with each MDS we interact with. | |
42 | * Within each session, we sent periodic heartbeat messages to ensure | |
43 | * any capabilities or leases we have been issues remain valid. If | |
44 | * the session times out and goes stale, our leases and capabilities | |
45 | * are no longer valid. | |
46 | */ | |
47 | ||
20cb34ae | 48 | struct ceph_reconnect_state { |
44c99757 | 49 | int nr_caps; |
20cb34ae | 50 | struct ceph_pagelist *pagelist; |
121f22a1 | 51 | unsigned msg_version; |
20cb34ae SW |
52 | }; |
53 | ||
2f2dc053 SW |
54 | static void __wake_requests(struct ceph_mds_client *mdsc, |
55 | struct list_head *head); | |
56 | ||
9e32789f | 57 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
58 | |
59 | ||
60 | /* | |
61 | * mds reply parsing | |
62 | */ | |
63 | ||
64 | /* | |
65 | * parse individual inode info | |
66 | */ | |
67 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 68 | struct ceph_mds_reply_info_in *info, |
12b4629a | 69 | u64 features) |
2f2dc053 SW |
70 | { |
71 | int err = -EIO; | |
72 | ||
73 | info->in = *p; | |
74 | *p += sizeof(struct ceph_mds_reply_inode) + | |
75 | sizeof(*info->in->fragtree.splits) * | |
76 | le32_to_cpu(info->in->fragtree.nsplits); | |
77 | ||
78 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
79 | ceph_decode_need(p, end, info->symlink_len, bad); | |
80 | info->symlink = *p; | |
81 | *p += info->symlink_len; | |
82 | ||
14303d20 SW |
83 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
84 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
85 | sizeof(info->dir_layout), bad); | |
86 | else | |
87 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
88 | ||
2f2dc053 SW |
89 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
90 | ceph_decode_need(p, end, info->xattr_len, bad); | |
91 | info->xattr_data = *p; | |
92 | *p += info->xattr_len; | |
fb01d1f8 YZ |
93 | |
94 | if (features & CEPH_FEATURE_MDS_INLINE_DATA) { | |
95 | ceph_decode_64_safe(p, end, info->inline_version, bad); | |
96 | ceph_decode_32_safe(p, end, info->inline_len, bad); | |
97 | ceph_decode_need(p, end, info->inline_len, bad); | |
98 | info->inline_data = *p; | |
99 | *p += info->inline_len; | |
100 | } else | |
101 | info->inline_version = CEPH_INLINE_NONE; | |
102 | ||
779fe0fb YZ |
103 | info->pool_ns_len = 0; |
104 | info->pool_ns_data = NULL; | |
5ea5c5e0 YZ |
105 | if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { |
106 | ceph_decode_32_safe(p, end, info->pool_ns_len, bad); | |
779fe0fb YZ |
107 | if (info->pool_ns_len > 0) { |
108 | ceph_decode_need(p, end, info->pool_ns_len, bad); | |
109 | info->pool_ns_data = *p; | |
110 | *p += info->pool_ns_len; | |
111 | } | |
5ea5c5e0 YZ |
112 | } |
113 | ||
2f2dc053 SW |
114 | return 0; |
115 | bad: | |
116 | return err; | |
117 | } | |
118 | ||
119 | /* | |
120 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
121 | * target inode. | |
122 | */ | |
123 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 124 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 125 | u64 features) |
2f2dc053 SW |
126 | { |
127 | int err; | |
128 | ||
129 | if (info->head->is_dentry) { | |
14303d20 | 130 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
131 | if (err < 0) |
132 | goto out_bad; | |
133 | ||
134 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
135 | goto bad; | |
136 | info->dirfrag = *p; | |
137 | *p += sizeof(*info->dirfrag) + | |
138 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
139 | if (unlikely(*p > end)) | |
140 | goto bad; | |
141 | ||
142 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
143 | ceph_decode_need(p, end, info->dname_len, bad); | |
144 | info->dname = *p; | |
145 | *p += info->dname_len; | |
146 | info->dlease = *p; | |
147 | *p += sizeof(*info->dlease); | |
148 | } | |
149 | ||
150 | if (info->head->is_target) { | |
14303d20 | 151 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
152 | if (err < 0) |
153 | goto out_bad; | |
154 | } | |
155 | ||
156 | if (unlikely(*p != end)) | |
157 | goto bad; | |
158 | return 0; | |
159 | ||
160 | bad: | |
161 | err = -EIO; | |
162 | out_bad: | |
163 | pr_err("problem parsing mds trace %d\n", err); | |
164 | return err; | |
165 | } | |
166 | ||
167 | /* | |
168 | * parse readdir results | |
169 | */ | |
170 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 171 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 172 | u64 features) |
2f2dc053 SW |
173 | { |
174 | u32 num, i = 0; | |
175 | int err; | |
176 | ||
177 | info->dir_dir = *p; | |
178 | if (*p + sizeof(*info->dir_dir) > end) | |
179 | goto bad; | |
180 | *p += sizeof(*info->dir_dir) + | |
181 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
182 | if (*p > end) | |
183 | goto bad; | |
184 | ||
185 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea | 186 | num = ceph_decode_32(p); |
956d39d6 YZ |
187 | { |
188 | u16 flags = ceph_decode_16(p); | |
189 | info->dir_end = !!(flags & CEPH_READDIR_FRAG_END); | |
190 | info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE); | |
f3c4ebe6 | 191 | info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER); |
956d39d6 | 192 | } |
2f2dc053 SW |
193 | if (num == 0) |
194 | goto done; | |
195 | ||
2a5beea3 YZ |
196 | BUG_ON(!info->dir_entries); |
197 | if ((unsigned long)(info->dir_entries + num) > | |
198 | (unsigned long)info->dir_entries + info->dir_buf_size) { | |
54008399 YZ |
199 | pr_err("dir contents are larger than expected\n"); |
200 | WARN_ON(1); | |
201 | goto bad; | |
202 | } | |
2f2dc053 | 203 | |
54008399 | 204 | info->dir_nr = num; |
2f2dc053 | 205 | while (num) { |
2a5beea3 | 206 | struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; |
2f2dc053 SW |
207 | /* dentry */ |
208 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
2a5beea3 YZ |
209 | rde->name_len = ceph_decode_32(p); |
210 | ceph_decode_need(p, end, rde->name_len, bad); | |
211 | rde->name = *p; | |
212 | *p += rde->name_len; | |
213 | dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); | |
214 | rde->lease = *p; | |
2f2dc053 SW |
215 | *p += sizeof(struct ceph_mds_reply_lease); |
216 | ||
217 | /* inode */ | |
2a5beea3 | 218 | err = parse_reply_info_in(p, end, &rde->inode, features); |
2f2dc053 SW |
219 | if (err < 0) |
220 | goto out_bad; | |
8974eebd YZ |
221 | /* ceph_readdir_prepopulate() will update it */ |
222 | rde->offset = 0; | |
2f2dc053 SW |
223 | i++; |
224 | num--; | |
225 | } | |
226 | ||
227 | done: | |
228 | if (*p != end) | |
229 | goto bad; | |
230 | return 0; | |
231 | ||
232 | bad: | |
233 | err = -EIO; | |
234 | out_bad: | |
235 | pr_err("problem parsing dir contents %d\n", err); | |
236 | return err; | |
237 | } | |
238 | ||
25933abd HS |
239 | /* |
240 | * parse fcntl F_GETLK results | |
241 | */ | |
242 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 243 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 244 | u64 features) |
25933abd HS |
245 | { |
246 | if (*p + sizeof(*info->filelock_reply) > end) | |
247 | goto bad; | |
248 | ||
249 | info->filelock_reply = *p; | |
250 | *p += sizeof(*info->filelock_reply); | |
251 | ||
252 | if (unlikely(*p != end)) | |
253 | goto bad; | |
254 | return 0; | |
255 | ||
256 | bad: | |
257 | return -EIO; | |
258 | } | |
259 | ||
6e8575fa SL |
260 | /* |
261 | * parse create results | |
262 | */ | |
263 | static int parse_reply_info_create(void **p, void *end, | |
264 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 265 | u64 features) |
6e8575fa SL |
266 | { |
267 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
268 | if (*p == end) { | |
269 | info->has_create_ino = false; | |
270 | } else { | |
271 | info->has_create_ino = true; | |
272 | info->ino = ceph_decode_64(p); | |
273 | } | |
274 | } | |
275 | ||
276 | if (unlikely(*p != end)) | |
277 | goto bad; | |
278 | return 0; | |
279 | ||
280 | bad: | |
281 | return -EIO; | |
282 | } | |
283 | ||
25933abd HS |
284 | /* |
285 | * parse extra results | |
286 | */ | |
287 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 288 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 289 | u64 features) |
25933abd HS |
290 | { |
291 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 292 | return parse_reply_info_filelock(p, end, info, features); |
8a034497 YZ |
293 | else if (info->head->op == CEPH_MDS_OP_READDIR || |
294 | info->head->op == CEPH_MDS_OP_LSSNAP) | |
14303d20 | 295 | return parse_reply_info_dir(p, end, info, features); |
6e8575fa SL |
296 | else if (info->head->op == CEPH_MDS_OP_CREATE) |
297 | return parse_reply_info_create(p, end, info, features); | |
298 | else | |
299 | return -EIO; | |
25933abd HS |
300 | } |
301 | ||
2f2dc053 SW |
302 | /* |
303 | * parse entire mds reply | |
304 | */ | |
305 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 306 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 307 | u64 features) |
2f2dc053 SW |
308 | { |
309 | void *p, *end; | |
310 | u32 len; | |
311 | int err; | |
312 | ||
313 | info->head = msg->front.iov_base; | |
314 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
315 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
316 | ||
317 | /* trace */ | |
318 | ceph_decode_32_safe(&p, end, len, bad); | |
319 | if (len > 0) { | |
32852a81 | 320 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 321 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
322 | if (err < 0) |
323 | goto out_bad; | |
324 | } | |
325 | ||
25933abd | 326 | /* extra */ |
2f2dc053 SW |
327 | ceph_decode_32_safe(&p, end, len, bad); |
328 | if (len > 0) { | |
32852a81 | 329 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 330 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
331 | if (err < 0) |
332 | goto out_bad; | |
333 | } | |
334 | ||
335 | /* snap blob */ | |
336 | ceph_decode_32_safe(&p, end, len, bad); | |
337 | info->snapblob_len = len; | |
338 | info->snapblob = p; | |
339 | p += len; | |
340 | ||
341 | if (p != end) | |
342 | goto bad; | |
343 | return 0; | |
344 | ||
345 | bad: | |
346 | err = -EIO; | |
347 | out_bad: | |
348 | pr_err("mds parse_reply err %d\n", err); | |
349 | return err; | |
350 | } | |
351 | ||
352 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
353 | { | |
2a5beea3 | 354 | if (!info->dir_entries) |
54008399 | 355 | return; |
2a5beea3 | 356 | free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size)); |
2f2dc053 SW |
357 | } |
358 | ||
359 | ||
360 | /* | |
361 | * sessions | |
362 | */ | |
a687ecaf | 363 | const char *ceph_session_state_name(int s) |
2f2dc053 SW |
364 | { |
365 | switch (s) { | |
366 | case CEPH_MDS_SESSION_NEW: return "new"; | |
367 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
368 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
369 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
370 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 371 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
372 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
373 | default: return "???"; | |
374 | } | |
375 | } | |
376 | ||
377 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
378 | { | |
379 | if (atomic_inc_not_zero(&s->s_ref)) { | |
380 | dout("mdsc get_session %p %d -> %d\n", s, | |
381 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
382 | return s; | |
383 | } else { | |
384 | dout("mdsc get_session %p 0 -- FAIL", s); | |
385 | return NULL; | |
386 | } | |
387 | } | |
388 | ||
389 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
390 | { | |
391 | dout("mdsc put_session %p %d -> %d\n", s, | |
392 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd | 393 | if (atomic_dec_and_test(&s->s_ref)) { |
6c4a1915 | 394 | if (s->s_auth.authorizer) |
6c1ea260 | 395 | ceph_auth_destroy_authorizer(s->s_auth.authorizer); |
2f2dc053 | 396 | kfree(s); |
4e7a5dcd | 397 | } |
2f2dc053 SW |
398 | } |
399 | ||
400 | /* | |
401 | * called under mdsc->mutex | |
402 | */ | |
403 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
404 | int mds) | |
405 | { | |
406 | struct ceph_mds_session *session; | |
407 | ||
408 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
409 | return NULL; | |
410 | session = mdsc->sessions[mds]; | |
411 | dout("lookup_mds_session %p %d\n", session, | |
412 | atomic_read(&session->s_ref)); | |
413 | get_session(session); | |
414 | return session; | |
415 | } | |
416 | ||
417 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
418 | { | |
419 | if (mds >= mdsc->max_sessions) | |
420 | return false; | |
421 | return mdsc->sessions[mds]; | |
422 | } | |
423 | ||
2600d2dd SW |
424 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
425 | struct ceph_mds_session *s) | |
426 | { | |
427 | if (s->s_mds >= mdsc->max_sessions || | |
428 | mdsc->sessions[s->s_mds] != s) | |
429 | return -ENOENT; | |
430 | return 0; | |
431 | } | |
432 | ||
2f2dc053 SW |
433 | /* |
434 | * create+register a new session for given mds. | |
435 | * called under mdsc->mutex. | |
436 | */ | |
437 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
438 | int mds) | |
439 | { | |
440 | struct ceph_mds_session *s; | |
441 | ||
c338c07c NY |
442 | if (mds >= mdsc->mdsmap->m_max_mds) |
443 | return ERR_PTR(-EINVAL); | |
444 | ||
2f2dc053 | 445 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
446 | if (!s) |
447 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
448 | s->s_mdsc = mdsc; |
449 | s->s_mds = mds; | |
450 | s->s_state = CEPH_MDS_SESSION_NEW; | |
451 | s->s_ttl = 0; | |
452 | s->s_seq = 0; | |
453 | mutex_init(&s->s_mutex); | |
454 | ||
b7a9e5dd | 455 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 456 | |
d8fb02ab | 457 | spin_lock_init(&s->s_gen_ttl_lock); |
2f2dc053 | 458 | s->s_cap_gen = 0; |
1ce208a6 | 459 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
460 | |
461 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 SW |
462 | s->s_renew_requested = 0; |
463 | s->s_renew_seq = 0; | |
464 | INIT_LIST_HEAD(&s->s_caps); | |
465 | s->s_nr_caps = 0; | |
5dacf091 | 466 | s->s_trim_caps = 0; |
2f2dc053 SW |
467 | atomic_set(&s->s_ref, 1); |
468 | INIT_LIST_HEAD(&s->s_waiting); | |
469 | INIT_LIST_HEAD(&s->s_unsafe); | |
470 | s->s_num_cap_releases = 0; | |
99a9c273 | 471 | s->s_cap_reconnect = 0; |
7c1332b8 | 472 | s->s_cap_iterator = NULL; |
2f2dc053 | 473 | INIT_LIST_HEAD(&s->s_cap_releases); |
2f2dc053 | 474 | INIT_LIST_HEAD(&s->s_cap_flushing); |
2f2dc053 SW |
475 | |
476 | dout("register_session mds%d\n", mds); | |
477 | if (mds >= mdsc->max_sessions) { | |
478 | int newmax = 1 << get_count_order(mds+1); | |
479 | struct ceph_mds_session **sa; | |
480 | ||
481 | dout("register_session realloc to %d\n", newmax); | |
482 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
483 | if (sa == NULL) | |
42ce56e5 | 484 | goto fail_realloc; |
2f2dc053 SW |
485 | if (mdsc->sessions) { |
486 | memcpy(sa, mdsc->sessions, | |
487 | mdsc->max_sessions * sizeof(void *)); | |
488 | kfree(mdsc->sessions); | |
489 | } | |
490 | mdsc->sessions = sa; | |
491 | mdsc->max_sessions = newmax; | |
492 | } | |
493 | mdsc->sessions[mds] = s; | |
86d8f67b | 494 | atomic_inc(&mdsc->num_sessions); |
2f2dc053 | 495 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ |
42ce56e5 | 496 | |
b7a9e5dd SW |
497 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
498 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 499 | |
2f2dc053 | 500 | return s; |
42ce56e5 SW |
501 | |
502 | fail_realloc: | |
503 | kfree(s); | |
504 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
505 | } |
506 | ||
507 | /* | |
508 | * called under mdsc->mutex | |
509 | */ | |
2600d2dd | 510 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 511 | struct ceph_mds_session *s) |
2f2dc053 | 512 | { |
2600d2dd SW |
513 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
514 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
515 | mdsc->sessions[s->s_mds] = NULL; |
516 | ceph_con_close(&s->s_con); | |
517 | ceph_put_mds_session(s); | |
86d8f67b | 518 | atomic_dec(&mdsc->num_sessions); |
2f2dc053 SW |
519 | } |
520 | ||
521 | /* | |
522 | * drop session refs in request. | |
523 | * | |
524 | * should be last request ref, or hold mdsc->mutex | |
525 | */ | |
526 | static void put_request_session(struct ceph_mds_request *req) | |
527 | { | |
528 | if (req->r_session) { | |
529 | ceph_put_mds_session(req->r_session); | |
530 | req->r_session = NULL; | |
531 | } | |
532 | } | |
533 | ||
153c8e6b | 534 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 535 | { |
153c8e6b SW |
536 | struct ceph_mds_request *req = container_of(kref, |
537 | struct ceph_mds_request, | |
538 | r_kref); | |
54008399 | 539 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
540 | if (req->r_request) |
541 | ceph_msg_put(req->r_request); | |
54008399 | 542 | if (req->r_reply) |
153c8e6b | 543 | ceph_msg_put(req->r_reply); |
153c8e6b | 544 | if (req->r_inode) { |
41b02e1f | 545 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
546 | iput(req->r_inode); |
547 | } | |
548 | if (req->r_locked_dir) | |
41b02e1f | 549 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
e96a650a | 550 | iput(req->r_target_inode); |
153c8e6b SW |
551 | if (req->r_dentry) |
552 | dput(req->r_dentry); | |
844d87c3 SW |
553 | if (req->r_old_dentry) |
554 | dput(req->r_old_dentry); | |
555 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
556 | /* |
557 | * track (and drop pins for) r_old_dentry_dir | |
558 | * separately, since r_old_dentry's d_parent may have | |
559 | * changed between the dir mutex being dropped and | |
560 | * this request being freed. | |
561 | */ | |
562 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
563 | CEPH_CAP_PIN); | |
41b02e1f | 564 | iput(req->r_old_dentry_dir); |
2f2dc053 | 565 | } |
153c8e6b SW |
566 | kfree(req->r_path1); |
567 | kfree(req->r_path2); | |
25e6bae3 YZ |
568 | if (req->r_pagelist) |
569 | ceph_pagelist_release(req->r_pagelist); | |
153c8e6b | 570 | put_request_session(req); |
37151668 | 571 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 572 | kfree(req); |
2f2dc053 SW |
573 | } |
574 | ||
fcd00b68 ID |
575 | DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node) |
576 | ||
2f2dc053 SW |
577 | /* |
578 | * lookup session, bump ref if found. | |
579 | * | |
580 | * called under mdsc->mutex. | |
581 | */ | |
fcd00b68 ID |
582 | static struct ceph_mds_request * |
583 | lookup_get_request(struct ceph_mds_client *mdsc, u64 tid) | |
2f2dc053 SW |
584 | { |
585 | struct ceph_mds_request *req; | |
44ca18f2 | 586 | |
fcd00b68 ID |
587 | req = lookup_request(&mdsc->request_tree, tid); |
588 | if (req) | |
589 | ceph_mdsc_get_request(req); | |
44ca18f2 | 590 | |
fcd00b68 | 591 | return req; |
2f2dc053 SW |
592 | } |
593 | ||
594 | /* | |
595 | * Register an in-flight request, and assign a tid. Link to directory | |
596 | * are modifying (if any). | |
597 | * | |
598 | * Called under mdsc->mutex. | |
599 | */ | |
600 | static void __register_request(struct ceph_mds_client *mdsc, | |
601 | struct ceph_mds_request *req, | |
602 | struct inode *dir) | |
603 | { | |
604 | req->r_tid = ++mdsc->last_tid; | |
605 | if (req->r_num_caps) | |
37151668 YS |
606 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
607 | req->r_num_caps); | |
2f2dc053 SW |
608 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
609 | ceph_mdsc_get_request(req); | |
fcd00b68 | 610 | insert_request(&mdsc->request_tree, req); |
2f2dc053 | 611 | |
cb4276cc SW |
612 | req->r_uid = current_fsuid(); |
613 | req->r_gid = current_fsgid(); | |
614 | ||
e8a7b8b1 YZ |
615 | if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) |
616 | mdsc->oldest_tid = req->r_tid; | |
617 | ||
2f2dc053 | 618 | if (dir) { |
3b663780 | 619 | ihold(dir); |
2f2dc053 | 620 | req->r_unsafe_dir = dir; |
2f2dc053 SW |
621 | } |
622 | } | |
623 | ||
624 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
625 | struct ceph_mds_request *req) | |
626 | { | |
627 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
e8a7b8b1 YZ |
628 | |
629 | if (req->r_tid == mdsc->oldest_tid) { | |
630 | struct rb_node *p = rb_next(&req->r_node); | |
631 | mdsc->oldest_tid = 0; | |
632 | while (p) { | |
633 | struct ceph_mds_request *next_req = | |
634 | rb_entry(p, struct ceph_mds_request, r_node); | |
635 | if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { | |
636 | mdsc->oldest_tid = next_req->r_tid; | |
637 | break; | |
638 | } | |
639 | p = rb_next(p); | |
640 | } | |
641 | } | |
642 | ||
fcd00b68 | 643 | erase_request(&mdsc->request_tree, req); |
2f2dc053 | 644 | |
4c06ace8 | 645 | if (req->r_unsafe_dir && req->r_got_unsafe) { |
2f2dc053 | 646 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); |
2f2dc053 SW |
647 | spin_lock(&ci->i_unsafe_lock); |
648 | list_del_init(&req->r_unsafe_dir_item); | |
649 | spin_unlock(&ci->i_unsafe_lock); | |
4c06ace8 | 650 | } |
68cd5b4b YZ |
651 | if (req->r_target_inode && req->r_got_unsafe) { |
652 | struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); | |
653 | spin_lock(&ci->i_unsafe_lock); | |
654 | list_del_init(&req->r_unsafe_target_item); | |
655 | spin_unlock(&ci->i_unsafe_lock); | |
656 | } | |
3b663780 | 657 | |
4c06ace8 | 658 | if (req->r_unsafe_dir) { |
3b663780 SW |
659 | iput(req->r_unsafe_dir); |
660 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 661 | } |
94aa8ae1 | 662 | |
fc55d2c9 YZ |
663 | complete_all(&req->r_safe_completion); |
664 | ||
94aa8ae1 | 665 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
666 | } |
667 | ||
668 | /* | |
669 | * Choose mds to send request to next. If there is a hint set in the | |
670 | * request (e.g., due to a prior forward hint from the mds), use that. | |
671 | * Otherwise, consult frag tree and/or caps to identify the | |
672 | * appropriate mds. If all else fails, choose randomly. | |
673 | * | |
674 | * Called under mdsc->mutex. | |
675 | */ | |
7fd7d101 | 676 | static struct dentry *get_nonsnap_parent(struct dentry *dentry) |
eb6bb1c5 | 677 | { |
d79698da SW |
678 | /* |
679 | * we don't need to worry about protecting the d_parent access | |
680 | * here because we never renaming inside the snapped namespace | |
681 | * except to resplice to another snapdir, and either the old or new | |
682 | * result is a valid result. | |
683 | */ | |
2b0143b5 | 684 | while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) |
eb6bb1c5 SW |
685 | dentry = dentry->d_parent; |
686 | return dentry; | |
687 | } | |
688 | ||
2f2dc053 SW |
689 | static int __choose_mds(struct ceph_mds_client *mdsc, |
690 | struct ceph_mds_request *req) | |
691 | { | |
692 | struct inode *inode; | |
693 | struct ceph_inode_info *ci; | |
694 | struct ceph_cap *cap; | |
695 | int mode = req->r_direct_mode; | |
696 | int mds = -1; | |
697 | u32 hash = req->r_direct_hash; | |
698 | bool is_hash = req->r_direct_is_hash; | |
699 | ||
700 | /* | |
701 | * is there a specific mds we should try? ignore hint if we have | |
702 | * no session and the mds is not up (active or recovering). | |
703 | */ | |
704 | if (req->r_resend_mds >= 0 && | |
705 | (__have_session(mdsc, req->r_resend_mds) || | |
706 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
707 | dout("choose_mds using resend_mds mds%d\n", | |
708 | req->r_resend_mds); | |
709 | return req->r_resend_mds; | |
710 | } | |
711 | ||
712 | if (mode == USE_RANDOM_MDS) | |
713 | goto random; | |
714 | ||
715 | inode = NULL; | |
716 | if (req->r_inode) { | |
717 | inode = req->r_inode; | |
718 | } else if (req->r_dentry) { | |
d79698da SW |
719 | /* ignore race with rename; old or new d_parent is okay */ |
720 | struct dentry *parent = req->r_dentry->d_parent; | |
2b0143b5 | 721 | struct inode *dir = d_inode(parent); |
eb6bb1c5 | 722 | |
3d14c5d2 | 723 | if (dir->i_sb != mdsc->fsc->sb) { |
eb6bb1c5 | 724 | /* not this fs! */ |
2b0143b5 | 725 | inode = d_inode(req->r_dentry); |
eb6bb1c5 SW |
726 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { |
727 | /* direct snapped/virtual snapdir requests | |
728 | * based on parent dir inode */ | |
d79698da | 729 | struct dentry *dn = get_nonsnap_parent(parent); |
2b0143b5 | 730 | inode = d_inode(dn); |
eb6bb1c5 | 731 | dout("__choose_mds using nonsnap parent %p\n", inode); |
ca18bede | 732 | } else { |
eb6bb1c5 | 733 | /* dentry target */ |
2b0143b5 | 734 | inode = d_inode(req->r_dentry); |
ca18bede YZ |
735 | if (!inode || mode == USE_AUTH_MDS) { |
736 | /* dir + name */ | |
737 | inode = dir; | |
738 | hash = ceph_dentry_hash(dir, req->r_dentry); | |
739 | is_hash = true; | |
740 | } | |
2f2dc053 SW |
741 | } |
742 | } | |
eb6bb1c5 | 743 | |
2f2dc053 SW |
744 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
745 | (int)hash, mode); | |
746 | if (!inode) | |
747 | goto random; | |
748 | ci = ceph_inode(inode); | |
749 | ||
750 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
751 | struct ceph_inode_frag frag; | |
752 | int found; | |
753 | ||
754 | ceph_choose_frag(ci, hash, &frag, &found); | |
755 | if (found) { | |
756 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
757 | u8 r; | |
758 | ||
759 | /* choose a random replica */ | |
760 | get_random_bytes(&r, 1); | |
761 | r %= frag.ndist; | |
762 | mds = frag.dist[r]; | |
763 | dout("choose_mds %p %llx.%llx " | |
764 | "frag %u mds%d (%d/%d)\n", | |
765 | inode, ceph_vinop(inode), | |
d66bbd44 | 766 | frag.frag, mds, |
2f2dc053 | 767 | (int)r, frag.ndist); |
d66bbd44 SW |
768 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
769 | CEPH_MDS_STATE_ACTIVE) | |
770 | return mds; | |
2f2dc053 SW |
771 | } |
772 | ||
773 | /* since this file/dir wasn't known to be | |
774 | * replicated, then we want to look for the | |
775 | * authoritative mds. */ | |
776 | mode = USE_AUTH_MDS; | |
777 | if (frag.mds >= 0) { | |
778 | /* choose auth mds */ | |
779 | mds = frag.mds; | |
780 | dout("choose_mds %p %llx.%llx " | |
781 | "frag %u mds%d (auth)\n", | |
782 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
783 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
784 | CEPH_MDS_STATE_ACTIVE) | |
785 | return mds; | |
2f2dc053 SW |
786 | } |
787 | } | |
788 | } | |
789 | ||
be655596 | 790 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
791 | cap = NULL; |
792 | if (mode == USE_AUTH_MDS) | |
793 | cap = ci->i_auth_cap; | |
794 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
795 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
796 | if (!cap) { | |
be655596 | 797 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
798 | goto random; |
799 | } | |
800 | mds = cap->session->s_mds; | |
801 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
802 | inode, ceph_vinop(inode), mds, | |
803 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 804 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
805 | return mds; |
806 | ||
807 | random: | |
808 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
809 | dout("choose_mds chose random mds%d\n", mds); | |
810 | return mds; | |
811 | } | |
812 | ||
813 | ||
814 | /* | |
815 | * session messages | |
816 | */ | |
817 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
818 | { | |
819 | struct ceph_msg *msg; | |
820 | struct ceph_mds_session_head *h; | |
821 | ||
b61c2763 SW |
822 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
823 | false); | |
a79832f2 | 824 | if (!msg) { |
2f2dc053 | 825 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 826 | return NULL; |
2f2dc053 SW |
827 | } |
828 | h = msg->front.iov_base; | |
829 | h->op = cpu_to_le32(op); | |
830 | h->seq = cpu_to_le64(seq); | |
dbd0c8bf JS |
831 | |
832 | return msg; | |
833 | } | |
834 | ||
835 | /* | |
836 | * session message, specialization for CEPH_SESSION_REQUEST_OPEN | |
837 | * to include additional client metadata fields. | |
838 | */ | |
839 | static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) | |
840 | { | |
841 | struct ceph_msg *msg; | |
842 | struct ceph_mds_session_head *h; | |
843 | int i = -1; | |
844 | int metadata_bytes = 0; | |
845 | int metadata_key_count = 0; | |
846 | struct ceph_options *opt = mdsc->fsc->client->options; | |
3f384954 | 847 | struct ceph_mount_options *fsopt = mdsc->fsc->mount_options; |
dbd0c8bf JS |
848 | void *p; |
849 | ||
a6a5ce4f | 850 | const char* metadata[][2] = { |
dbd0c8bf | 851 | {"hostname", utsname()->nodename}, |
a6a5ce4f | 852 | {"kernel_version", utsname()->release}, |
3f384954 YZ |
853 | {"entity_id", opt->name ? : ""}, |
854 | {"root", fsopt->server_path ? : "/"}, | |
dbd0c8bf JS |
855 | {NULL, NULL} |
856 | }; | |
857 | ||
858 | /* Calculate serialized length of metadata */ | |
859 | metadata_bytes = 4; /* map length */ | |
860 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
861 | metadata_bytes += 8 + strlen(metadata[i][0]) + | |
862 | strlen(metadata[i][1]); | |
863 | metadata_key_count++; | |
864 | } | |
865 | ||
866 | /* Allocate the message */ | |
867 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, | |
868 | GFP_NOFS, false); | |
869 | if (!msg) { | |
870 | pr_err("create_session_msg ENOMEM creating msg\n"); | |
871 | return NULL; | |
872 | } | |
873 | h = msg->front.iov_base; | |
874 | h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); | |
875 | h->seq = cpu_to_le64(seq); | |
876 | ||
877 | /* | |
878 | * Serialize client metadata into waiting buffer space, using | |
879 | * the format that userspace expects for map<string, string> | |
7cfa0313 JS |
880 | * |
881 | * ClientSession messages with metadata are v2 | |
dbd0c8bf | 882 | */ |
7cfa0313 JS |
883 | msg->hdr.version = cpu_to_le16(2); |
884 | msg->hdr.compat_version = cpu_to_le16(1); | |
dbd0c8bf JS |
885 | |
886 | /* The write pointer, following the session_head structure */ | |
887 | p = msg->front.iov_base + sizeof(*h); | |
888 | ||
889 | /* Number of entries in the map */ | |
890 | ceph_encode_32(&p, metadata_key_count); | |
891 | ||
892 | /* Two length-prefixed strings for each entry in the map */ | |
893 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
894 | size_t const key_len = strlen(metadata[i][0]); | |
895 | size_t const val_len = strlen(metadata[i][1]); | |
896 | ||
897 | ceph_encode_32(&p, key_len); | |
898 | memcpy(p, metadata[i][0], key_len); | |
899 | p += key_len; | |
900 | ceph_encode_32(&p, val_len); | |
901 | memcpy(p, metadata[i][1], val_len); | |
902 | p += val_len; | |
903 | } | |
904 | ||
2f2dc053 SW |
905 | return msg; |
906 | } | |
907 | ||
908 | /* | |
909 | * send session open request. | |
910 | * | |
911 | * called under mdsc->mutex | |
912 | */ | |
913 | static int __open_session(struct ceph_mds_client *mdsc, | |
914 | struct ceph_mds_session *session) | |
915 | { | |
916 | struct ceph_msg *msg; | |
917 | int mstate; | |
918 | int mds = session->s_mds; | |
2f2dc053 SW |
919 | |
920 | /* wait for mds to go active? */ | |
921 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
922 | dout("open_session to mds%d (%s)\n", mds, | |
923 | ceph_mds_state_name(mstate)); | |
924 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
925 | session->s_renew_requested = jiffies; | |
926 | ||
927 | /* send connect message */ | |
dbd0c8bf | 928 | msg = create_session_open_msg(mdsc, session->s_seq); |
a79832f2 SW |
929 | if (!msg) |
930 | return -ENOMEM; | |
2f2dc053 | 931 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
932 | return 0; |
933 | } | |
934 | ||
ed0552a1 SW |
935 | /* |
936 | * open sessions for any export targets for the given mds | |
937 | * | |
938 | * called under mdsc->mutex | |
939 | */ | |
5d72d13c YZ |
940 | static struct ceph_mds_session * |
941 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
942 | { | |
943 | struct ceph_mds_session *session; | |
944 | ||
945 | session = __ceph_lookup_mds_session(mdsc, target); | |
946 | if (!session) { | |
947 | session = register_session(mdsc, target); | |
948 | if (IS_ERR(session)) | |
949 | return session; | |
950 | } | |
951 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
952 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
953 | __open_session(mdsc, session); | |
954 | ||
955 | return session; | |
956 | } | |
957 | ||
958 | struct ceph_mds_session * | |
959 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
960 | { | |
961 | struct ceph_mds_session *session; | |
962 | ||
963 | dout("open_export_target_session to mds%d\n", target); | |
964 | ||
965 | mutex_lock(&mdsc->mutex); | |
966 | session = __open_export_target_session(mdsc, target); | |
967 | mutex_unlock(&mdsc->mutex); | |
968 | ||
969 | return session; | |
970 | } | |
971 | ||
ed0552a1 SW |
972 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
973 | struct ceph_mds_session *session) | |
974 | { | |
975 | struct ceph_mds_info *mi; | |
976 | struct ceph_mds_session *ts; | |
977 | int i, mds = session->s_mds; | |
ed0552a1 SW |
978 | |
979 | if (mds >= mdsc->mdsmap->m_max_mds) | |
980 | return; | |
5d72d13c | 981 | |
ed0552a1 SW |
982 | mi = &mdsc->mdsmap->m_info[mds]; |
983 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
984 | session->s_mds, mi->num_export_targets); | |
985 | ||
986 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c YZ |
987 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
988 | if (!IS_ERR(ts)) | |
989 | ceph_put_mds_session(ts); | |
ed0552a1 SW |
990 | } |
991 | } | |
992 | ||
154f42c2 SW |
993 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
994 | struct ceph_mds_session *session) | |
995 | { | |
996 | mutex_lock(&mdsc->mutex); | |
997 | __open_export_target_sessions(mdsc, session); | |
998 | mutex_unlock(&mdsc->mutex); | |
999 | } | |
1000 | ||
2f2dc053 SW |
1001 | /* |
1002 | * session caps | |
1003 | */ | |
1004 | ||
745a8e3b YZ |
1005 | /* caller holds s_cap_lock, we drop it */ |
1006 | static void cleanup_cap_releases(struct ceph_mds_client *mdsc, | |
1007 | struct ceph_mds_session *session) | |
1008 | __releases(session->s_cap_lock) | |
2f2dc053 | 1009 | { |
745a8e3b YZ |
1010 | LIST_HEAD(tmp_list); |
1011 | list_splice_init(&session->s_cap_releases, &tmp_list); | |
1012 | session->s_num_cap_releases = 0; | |
1013 | spin_unlock(&session->s_cap_lock); | |
2f2dc053 | 1014 | |
745a8e3b YZ |
1015 | dout("cleanup_cap_releases mds%d\n", session->s_mds); |
1016 | while (!list_empty(&tmp_list)) { | |
1017 | struct ceph_cap *cap; | |
1018 | /* zero out the in-progress message */ | |
1019 | cap = list_first_entry(&tmp_list, | |
1020 | struct ceph_cap, session_caps); | |
1021 | list_del(&cap->session_caps); | |
1022 | ceph_put_cap(mdsc, cap); | |
2f2dc053 | 1023 | } |
2f2dc053 SW |
1024 | } |
1025 | ||
1c841a96 YZ |
1026 | static void cleanup_session_requests(struct ceph_mds_client *mdsc, |
1027 | struct ceph_mds_session *session) | |
1028 | { | |
1029 | struct ceph_mds_request *req; | |
1030 | struct rb_node *p; | |
1031 | ||
1032 | dout("cleanup_session_requests mds%d\n", session->s_mds); | |
1033 | mutex_lock(&mdsc->mutex); | |
1034 | while (!list_empty(&session->s_unsafe)) { | |
1035 | req = list_first_entry(&session->s_unsafe, | |
1036 | struct ceph_mds_request, r_unsafe_item); | |
1037 | list_del_init(&req->r_unsafe_item); | |
3e0708b9 YZ |
1038 | pr_warn_ratelimited(" dropping unsafe request %llu\n", |
1039 | req->r_tid); | |
1c841a96 YZ |
1040 | __unregister_request(mdsc, req); |
1041 | } | |
1042 | /* zero r_attempts, so kick_requests() will re-send requests */ | |
1043 | p = rb_first(&mdsc->request_tree); | |
1044 | while (p) { | |
1045 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
1046 | p = rb_next(p); | |
1047 | if (req->r_session && | |
1048 | req->r_session->s_mds == session->s_mds) | |
1049 | req->r_attempts = 0; | |
1050 | } | |
1051 | mutex_unlock(&mdsc->mutex); | |
1052 | } | |
1053 | ||
2f2dc053 | 1054 | /* |
f818a736 SW |
1055 | * Helper to safely iterate over all caps associated with a session, with |
1056 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 1057 | * |
f818a736 | 1058 | * Caller must hold session s_mutex. |
2f2dc053 SW |
1059 | */ |
1060 | static int iterate_session_caps(struct ceph_mds_session *session, | |
1061 | int (*cb)(struct inode *, struct ceph_cap *, | |
1062 | void *), void *arg) | |
1063 | { | |
7c1332b8 SW |
1064 | struct list_head *p; |
1065 | struct ceph_cap *cap; | |
1066 | struct inode *inode, *last_inode = NULL; | |
1067 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
1068 | int ret; |
1069 | ||
1070 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
1071 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
1072 | p = session->s_caps.next; |
1073 | while (p != &session->s_caps) { | |
1074 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 1075 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
1076 | if (!inode) { |
1077 | p = p->next; | |
2f2dc053 | 1078 | continue; |
7c1332b8 SW |
1079 | } |
1080 | session->s_cap_iterator = cap; | |
2f2dc053 | 1081 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1082 | |
1083 | if (last_inode) { | |
1084 | iput(last_inode); | |
1085 | last_inode = NULL; | |
1086 | } | |
1087 | if (old_cap) { | |
37151668 | 1088 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
1089 | old_cap = NULL; |
1090 | } | |
1091 | ||
2f2dc053 | 1092 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
1093 | last_inode = inode; |
1094 | ||
2f2dc053 | 1095 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
1096 | p = p->next; |
1097 | if (cap->ci == NULL) { | |
1098 | dout("iterate_session_caps finishing cap %p removal\n", | |
1099 | cap); | |
1100 | BUG_ON(cap->session != session); | |
745a8e3b | 1101 | cap->session = NULL; |
7c1332b8 SW |
1102 | list_del_init(&cap->session_caps); |
1103 | session->s_nr_caps--; | |
745a8e3b YZ |
1104 | if (cap->queue_release) { |
1105 | list_add_tail(&cap->session_caps, | |
1106 | &session->s_cap_releases); | |
1107 | session->s_num_cap_releases++; | |
1108 | } else { | |
1109 | old_cap = cap; /* put_cap it w/o locks held */ | |
1110 | } | |
7c1332b8 | 1111 | } |
5dacf091 SW |
1112 | if (ret < 0) |
1113 | goto out; | |
2f2dc053 | 1114 | } |
5dacf091 SW |
1115 | ret = 0; |
1116 | out: | |
7c1332b8 | 1117 | session->s_cap_iterator = NULL; |
2f2dc053 | 1118 | spin_unlock(&session->s_cap_lock); |
7c1332b8 | 1119 | |
e96a650a | 1120 | iput(last_inode); |
7c1332b8 | 1121 | if (old_cap) |
37151668 | 1122 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1123 | |
5dacf091 | 1124 | return ret; |
2f2dc053 SW |
1125 | } |
1126 | ||
1127 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1128 | void *arg) |
2f2dc053 | 1129 | { |
6c93df5d | 1130 | struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg; |
2f2dc053 | 1131 | struct ceph_inode_info *ci = ceph_inode(inode); |
553adfd9 | 1132 | LIST_HEAD(to_remove); |
6c93df5d YZ |
1133 | bool drop = false; |
1134 | bool invalidate = false; | |
6c99f254 | 1135 | |
2f2dc053 SW |
1136 | dout("removing cap %p, ci is %p, inode is %p\n", |
1137 | cap, ci, &ci->vfs_inode); | |
be655596 | 1138 | spin_lock(&ci->i_ceph_lock); |
a096b09a | 1139 | __ceph_remove_cap(cap, false); |
571ade33 | 1140 | if (!ci->i_auth_cap) { |
553adfd9 | 1141 | struct ceph_cap_flush *cf; |
6c93df5d | 1142 | struct ceph_mds_client *mdsc = fsc->mdsc; |
6c99f254 | 1143 | |
77310320 YZ |
1144 | ci->i_ceph_flags |= CEPH_I_CAP_DROPPED; |
1145 | ||
6c93df5d YZ |
1146 | if (ci->i_wrbuffer_ref > 0 && |
1147 | ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) | |
1148 | invalidate = true; | |
1149 | ||
e4500b5e YZ |
1150 | while (!list_empty(&ci->i_cap_flush_list)) { |
1151 | cf = list_first_entry(&ci->i_cap_flush_list, | |
1152 | struct ceph_cap_flush, i_list); | |
1153 | list_del(&cf->i_list); | |
1154 | list_add(&cf->i_list, &to_remove); | |
553adfd9 YZ |
1155 | } |
1156 | ||
6c99f254 | 1157 | spin_lock(&mdsc->cap_dirty_lock); |
8310b089 | 1158 | |
e4500b5e YZ |
1159 | list_for_each_entry(cf, &to_remove, i_list) |
1160 | list_del(&cf->g_list); | |
8310b089 | 1161 | |
6c99f254 | 1162 | if (!list_empty(&ci->i_dirty_item)) { |
3e0708b9 YZ |
1163 | pr_warn_ratelimited( |
1164 | " dropping dirty %s state for %p %lld\n", | |
6c99f254 SW |
1165 | ceph_cap_string(ci->i_dirty_caps), |
1166 | inode, ceph_ino(inode)); | |
1167 | ci->i_dirty_caps = 0; | |
1168 | list_del_init(&ci->i_dirty_item); | |
6c93df5d | 1169 | drop = true; |
6c99f254 SW |
1170 | } |
1171 | if (!list_empty(&ci->i_flushing_item)) { | |
3e0708b9 YZ |
1172 | pr_warn_ratelimited( |
1173 | " dropping dirty+flushing %s state for %p %lld\n", | |
6c99f254 SW |
1174 | ceph_cap_string(ci->i_flushing_caps), |
1175 | inode, ceph_ino(inode)); | |
1176 | ci->i_flushing_caps = 0; | |
1177 | list_del_init(&ci->i_flushing_item); | |
1178 | mdsc->num_cap_flushing--; | |
6c93df5d | 1179 | drop = true; |
6c99f254 | 1180 | } |
6c99f254 | 1181 | spin_unlock(&mdsc->cap_dirty_lock); |
553adfd9 | 1182 | |
f66fd9f0 | 1183 | if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) { |
e4500b5e | 1184 | list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove); |
f66fd9f0 YZ |
1185 | ci->i_prealloc_cap_flush = NULL; |
1186 | } | |
6c99f254 | 1187 | } |
be655596 | 1188 | spin_unlock(&ci->i_ceph_lock); |
553adfd9 YZ |
1189 | while (!list_empty(&to_remove)) { |
1190 | struct ceph_cap_flush *cf; | |
1191 | cf = list_first_entry(&to_remove, | |
e4500b5e YZ |
1192 | struct ceph_cap_flush, i_list); |
1193 | list_del(&cf->i_list); | |
f66fd9f0 | 1194 | ceph_free_cap_flush(cf); |
553adfd9 | 1195 | } |
77310320 YZ |
1196 | |
1197 | wake_up_all(&ci->i_cap_wq); | |
6c93df5d YZ |
1198 | if (invalidate) |
1199 | ceph_queue_invalidate(inode); | |
77310320 | 1200 | if (drop) |
6c99f254 | 1201 | iput(inode); |
2f2dc053 SW |
1202 | return 0; |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | * caller must hold session s_mutex | |
1207 | */ | |
1208 | static void remove_session_caps(struct ceph_mds_session *session) | |
1209 | { | |
6c93df5d YZ |
1210 | struct ceph_fs_client *fsc = session->s_mdsc->fsc; |
1211 | struct super_block *sb = fsc->sb; | |
2f2dc053 | 1212 | dout("remove_session_caps on %p\n", session); |
6c93df5d | 1213 | iterate_session_caps(session, remove_session_caps_cb, fsc); |
6f60f889 | 1214 | |
c8799fc4 YZ |
1215 | wake_up_all(&fsc->mdsc->cap_flushing_wq); |
1216 | ||
6f60f889 YZ |
1217 | spin_lock(&session->s_cap_lock); |
1218 | if (session->s_nr_caps > 0) { | |
6f60f889 YZ |
1219 | struct inode *inode; |
1220 | struct ceph_cap *cap, *prev = NULL; | |
1221 | struct ceph_vino vino; | |
1222 | /* | |
1223 | * iterate_session_caps() skips inodes that are being | |
1224 | * deleted, we need to wait until deletions are complete. | |
1225 | * __wait_on_freeing_inode() is designed for the job, | |
1226 | * but it is not exported, so use lookup inode function | |
1227 | * to access it. | |
1228 | */ | |
1229 | while (!list_empty(&session->s_caps)) { | |
1230 | cap = list_entry(session->s_caps.next, | |
1231 | struct ceph_cap, session_caps); | |
1232 | if (cap == prev) | |
1233 | break; | |
1234 | prev = cap; | |
1235 | vino = cap->ci->i_vino; | |
1236 | spin_unlock(&session->s_cap_lock); | |
1237 | ||
ed284c49 | 1238 | inode = ceph_find_inode(sb, vino); |
6f60f889 YZ |
1239 | iput(inode); |
1240 | ||
1241 | spin_lock(&session->s_cap_lock); | |
1242 | } | |
1243 | } | |
745a8e3b YZ |
1244 | |
1245 | // drop cap expires and unlock s_cap_lock | |
1246 | cleanup_cap_releases(session->s_mdsc, session); | |
6f60f889 | 1247 | |
2f2dc053 | 1248 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1249 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
2f2dc053 SW |
1250 | } |
1251 | ||
1252 | /* | |
1253 | * wake up any threads waiting on this session's caps. if the cap is | |
1254 | * old (didn't get renewed on the client reconnect), remove it now. | |
1255 | * | |
1256 | * caller must hold s_mutex. | |
1257 | */ | |
1258 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1259 | void *arg) | |
1260 | { | |
0dc2570f SW |
1261 | struct ceph_inode_info *ci = ceph_inode(inode); |
1262 | ||
0dc2570f | 1263 | if (arg) { |
be655596 | 1264 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1265 | ci->i_wanted_max_size = 0; |
1266 | ci->i_requested_max_size = 0; | |
be655596 | 1267 | spin_unlock(&ci->i_ceph_lock); |
0dc2570f | 1268 | } |
e5360309 | 1269 | wake_up_all(&ci->i_cap_wq); |
2f2dc053 SW |
1270 | return 0; |
1271 | } | |
1272 | ||
0dc2570f SW |
1273 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1274 | int reconnect) | |
2f2dc053 SW |
1275 | { |
1276 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1277 | iterate_session_caps(session, wake_up_session_cb, |
1278 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1279 | } |
1280 | ||
1281 | /* | |
1282 | * Send periodic message to MDS renewing all currently held caps. The | |
1283 | * ack will reset the expiration for all caps from this session. | |
1284 | * | |
1285 | * caller holds s_mutex | |
1286 | */ | |
1287 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1288 | struct ceph_mds_session *session) | |
1289 | { | |
1290 | struct ceph_msg *msg; | |
1291 | int state; | |
1292 | ||
1293 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1294 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1295 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1296 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1297 | |
1298 | /* do not try to renew caps until a recovering mds has reconnected | |
1299 | * with its clients. */ | |
1300 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1301 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1302 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1303 | session->s_mds, ceph_mds_state_name(state)); | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1308 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1309 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1310 | ++session->s_renew_seq); | |
a79832f2 SW |
1311 | if (!msg) |
1312 | return -ENOMEM; | |
2f2dc053 SW |
1313 | ceph_con_send(&session->s_con, msg); |
1314 | return 0; | |
1315 | } | |
1316 | ||
186e4f7a YZ |
1317 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1318 | struct ceph_mds_session *session, u64 seq) | |
1319 | { | |
1320 | struct ceph_msg *msg; | |
1321 | ||
1322 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
a687ecaf | 1323 | session->s_mds, ceph_session_state_name(session->s_state), seq); |
186e4f7a YZ |
1324 | msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); |
1325 | if (!msg) | |
1326 | return -ENOMEM; | |
1327 | ceph_con_send(&session->s_con, msg); | |
1328 | return 0; | |
1329 | } | |
1330 | ||
1331 | ||
2f2dc053 SW |
1332 | /* |
1333 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1334 | * |
1335 | * Called under session->s_mutex | |
2f2dc053 SW |
1336 | */ |
1337 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1338 | struct ceph_mds_session *session, int is_renew) | |
1339 | { | |
1340 | int was_stale; | |
1341 | int wake = 0; | |
1342 | ||
1343 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1344 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1345 | |
1346 | session->s_cap_ttl = session->s_renew_requested + | |
1347 | mdsc->mdsmap->m_session_timeout*HZ; | |
1348 | ||
1349 | if (was_stale) { | |
1350 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1351 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1352 | wake = 1; | |
1353 | } else { | |
1354 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1355 | } | |
1356 | } | |
1357 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1358 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1359 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1360 | spin_unlock(&session->s_cap_lock); | |
1361 | ||
1362 | if (wake) | |
0dc2570f | 1363 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1364 | } |
1365 | ||
1366 | /* | |
1367 | * send a session close request | |
1368 | */ | |
1369 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1370 | struct ceph_mds_session *session) | |
1371 | { | |
1372 | struct ceph_msg *msg; | |
2f2dc053 SW |
1373 | |
1374 | dout("request_close_session mds%d state %s seq %lld\n", | |
a687ecaf | 1375 | session->s_mds, ceph_session_state_name(session->s_state), |
2f2dc053 SW |
1376 | session->s_seq); |
1377 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1378 | if (!msg) |
1379 | return -ENOMEM; | |
1380 | ceph_con_send(&session->s_con, msg); | |
1381 | return 0; | |
2f2dc053 SW |
1382 | } |
1383 | ||
1384 | /* | |
1385 | * Called with s_mutex held. | |
1386 | */ | |
1387 | static int __close_session(struct ceph_mds_client *mdsc, | |
1388 | struct ceph_mds_session *session) | |
1389 | { | |
1390 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1391 | return 0; | |
1392 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1393 | return request_close_session(mdsc, session); | |
1394 | } | |
1395 | ||
1396 | /* | |
1397 | * Trim old(er) caps. | |
1398 | * | |
1399 | * Because we can't cache an inode without one or more caps, we do | |
1400 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1401 | * point the inode will hopefully get dropped to. | |
1402 | * | |
1403 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1404 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1405 | */ | |
1406 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1407 | { | |
1408 | struct ceph_mds_session *session = arg; | |
1409 | struct ceph_inode_info *ci = ceph_inode(inode); | |
979abfdd | 1410 | int used, wanted, oissued, mine; |
2f2dc053 SW |
1411 | |
1412 | if (session->s_trim_caps <= 0) | |
1413 | return -1; | |
1414 | ||
be655596 | 1415 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1416 | mine = cap->issued | cap->implemented; |
1417 | used = __ceph_caps_used(ci); | |
979abfdd | 1418 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1419 | oissued = __ceph_caps_issued_other(ci, cap); |
1420 | ||
979abfdd | 1421 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1422 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1423 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1424 | if (cap == ci->i_auth_cap) { | |
622f3e25 YZ |
1425 | if (ci->i_dirty_caps || ci->i_flushing_caps || |
1426 | !list_empty(&ci->i_cap_snaps)) | |
979abfdd YZ |
1427 | goto out; |
1428 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1429 | goto out; | |
1430 | } | |
5e804ac4 YZ |
1431 | /* The inode has cached pages, but it's no longer used. |
1432 | * we can safely drop it */ | |
1433 | if (wanted == 0 && used == CEPH_CAP_FILE_CACHE && | |
1434 | !(oissued & CEPH_CAP_FILE_CACHE)) { | |
1435 | used = 0; | |
1436 | oissued = 0; | |
1437 | } | |
979abfdd | 1438 | if ((used | wanted) & ~oissued & mine) |
2f2dc053 SW |
1439 | goto out; /* we need these caps */ |
1440 | ||
1441 | session->s_trim_caps--; | |
1442 | if (oissued) { | |
1443 | /* we aren't the only cap.. just remove us */ | |
a096b09a | 1444 | __ceph_remove_cap(cap, true); |
2f2dc053 | 1445 | } else { |
5e804ac4 | 1446 | /* try dropping referring dentries */ |
be655596 | 1447 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1448 | d_prune_aliases(inode); |
1449 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1450 | inode, cap, atomic_read(&inode->i_count)); | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | out: | |
be655596 | 1455 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1456 | return 0; |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * Trim session cap count down to some max number. | |
1461 | */ | |
1462 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1463 | struct ceph_mds_session *session, | |
1464 | int max_caps) | |
1465 | { | |
1466 | int trim_caps = session->s_nr_caps - max_caps; | |
1467 | ||
1468 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1469 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1470 | if (trim_caps > 0) { | |
1471 | session->s_trim_caps = trim_caps; | |
1472 | iterate_session_caps(session, trim_caps_cb, session); | |
1473 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1474 | session->s_mds, session->s_nr_caps, max_caps, | |
1475 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1476 | session->s_trim_caps = 0; |
2f2dc053 | 1477 | } |
a56371d9 | 1478 | |
a56371d9 | 1479 | ceph_send_cap_releases(mdsc, session); |
2f2dc053 SW |
1480 | return 0; |
1481 | } | |
1482 | ||
8310b089 YZ |
1483 | static int check_caps_flush(struct ceph_mds_client *mdsc, |
1484 | u64 want_flush_tid) | |
1485 | { | |
8310b089 YZ |
1486 | int ret = 1; |
1487 | ||
1488 | spin_lock(&mdsc->cap_dirty_lock); | |
e4500b5e YZ |
1489 | if (!list_empty(&mdsc->cap_flush_list)) { |
1490 | struct ceph_cap_flush *cf = | |
1491 | list_first_entry(&mdsc->cap_flush_list, | |
1492 | struct ceph_cap_flush, g_list); | |
1493 | if (cf->tid <= want_flush_tid) { | |
1494 | dout("check_caps_flush still flushing tid " | |
1495 | "%llu <= %llu\n", cf->tid, want_flush_tid); | |
1496 | ret = 0; | |
1497 | } | |
8310b089 YZ |
1498 | } |
1499 | spin_unlock(&mdsc->cap_dirty_lock); | |
1500 | return ret; | |
d3383a8e YZ |
1501 | } |
1502 | ||
2f2dc053 SW |
1503 | /* |
1504 | * flush all dirty inode data to disk. | |
1505 | * | |
8310b089 | 1506 | * returns true if we've flushed through want_flush_tid |
2f2dc053 | 1507 | */ |
affbc19a | 1508 | static void wait_caps_flush(struct ceph_mds_client *mdsc, |
0e294387 | 1509 | u64 want_flush_tid) |
2f2dc053 | 1510 | { |
0e294387 | 1511 | dout("check_caps_flush want %llu\n", want_flush_tid); |
8310b089 YZ |
1512 | |
1513 | wait_event(mdsc->cap_flushing_wq, | |
1514 | check_caps_flush(mdsc, want_flush_tid)); | |
1515 | ||
1516 | dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid); | |
2f2dc053 SW |
1517 | } |
1518 | ||
1519 | /* | |
1520 | * called under s_mutex | |
1521 | */ | |
3d7ded4d SW |
1522 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1523 | struct ceph_mds_session *session) | |
2f2dc053 | 1524 | { |
745a8e3b YZ |
1525 | struct ceph_msg *msg = NULL; |
1526 | struct ceph_mds_cap_release *head; | |
1527 | struct ceph_mds_cap_item *item; | |
1528 | struct ceph_cap *cap; | |
1529 | LIST_HEAD(tmp_list); | |
1530 | int num_cap_releases; | |
2f2dc053 | 1531 | |
0f8605f2 | 1532 | spin_lock(&session->s_cap_lock); |
745a8e3b YZ |
1533 | again: |
1534 | list_splice_init(&session->s_cap_releases, &tmp_list); | |
1535 | num_cap_releases = session->s_num_cap_releases; | |
1536 | session->s_num_cap_releases = 0; | |
2f2dc053 | 1537 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 1538 | |
745a8e3b YZ |
1539 | while (!list_empty(&tmp_list)) { |
1540 | if (!msg) { | |
1541 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, | |
09cbfeaf | 1542 | PAGE_SIZE, GFP_NOFS, false); |
745a8e3b YZ |
1543 | if (!msg) |
1544 | goto out_err; | |
1545 | head = msg->front.iov_base; | |
1546 | head->num = cpu_to_le32(0); | |
1547 | msg->front.iov_len = sizeof(*head); | |
1548 | } | |
1549 | cap = list_first_entry(&tmp_list, struct ceph_cap, | |
1550 | session_caps); | |
1551 | list_del(&cap->session_caps); | |
1552 | num_cap_releases--; | |
e01a5946 | 1553 | |
00bd8edb | 1554 | head = msg->front.iov_base; |
745a8e3b YZ |
1555 | le32_add_cpu(&head->num, 1); |
1556 | item = msg->front.iov_base + msg->front.iov_len; | |
1557 | item->ino = cpu_to_le64(cap->cap_ino); | |
1558 | item->cap_id = cpu_to_le64(cap->cap_id); | |
1559 | item->migrate_seq = cpu_to_le32(cap->mseq); | |
1560 | item->seq = cpu_to_le32(cap->issue_seq); | |
1561 | msg->front.iov_len += sizeof(*item); | |
1562 | ||
1563 | ceph_put_cap(mdsc, cap); | |
1564 | ||
1565 | if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { | |
1566 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1567 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1568 | ceph_con_send(&session->s_con, msg); | |
1569 | msg = NULL; | |
1570 | } | |
00bd8edb | 1571 | } |
e01a5946 | 1572 | |
745a8e3b | 1573 | BUG_ON(num_cap_releases != 0); |
e01a5946 | 1574 | |
745a8e3b YZ |
1575 | spin_lock(&session->s_cap_lock); |
1576 | if (!list_empty(&session->s_cap_releases)) | |
1577 | goto again; | |
1578 | spin_unlock(&session->s_cap_lock); | |
1579 | ||
1580 | if (msg) { | |
1581 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1582 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1583 | ceph_con_send(&session->s_con, msg); | |
e01a5946 | 1584 | } |
745a8e3b YZ |
1585 | return; |
1586 | out_err: | |
1587 | pr_err("send_cap_releases mds%d, failed to allocate message\n", | |
1588 | session->s_mds); | |
1589 | spin_lock(&session->s_cap_lock); | |
1590 | list_splice(&tmp_list, &session->s_cap_releases); | |
1591 | session->s_num_cap_releases += num_cap_releases; | |
1592 | spin_unlock(&session->s_cap_lock); | |
e01a5946 SW |
1593 | } |
1594 | ||
2f2dc053 SW |
1595 | /* |
1596 | * requests | |
1597 | */ | |
1598 | ||
54008399 YZ |
1599 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
1600 | struct inode *dir) | |
1601 | { | |
1602 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1603 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
1604 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
2a5beea3 | 1605 | size_t size = sizeof(struct ceph_mds_reply_dir_entry); |
54008399 YZ |
1606 | int order, num_entries; |
1607 | ||
1608 | spin_lock(&ci->i_ceph_lock); | |
1609 | num_entries = ci->i_files + ci->i_subdirs; | |
1610 | spin_unlock(&ci->i_ceph_lock); | |
1611 | num_entries = max(num_entries, 1); | |
1612 | num_entries = min(num_entries, opt->max_readdir); | |
1613 | ||
1614 | order = get_order(size * num_entries); | |
1615 | while (order >= 0) { | |
2a5beea3 YZ |
1616 | rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL | |
1617 | __GFP_NOWARN, | |
1618 | order); | |
1619 | if (rinfo->dir_entries) | |
54008399 YZ |
1620 | break; |
1621 | order--; | |
1622 | } | |
2a5beea3 | 1623 | if (!rinfo->dir_entries) |
54008399 YZ |
1624 | return -ENOMEM; |
1625 | ||
1626 | num_entries = (PAGE_SIZE << order) / size; | |
1627 | num_entries = min(num_entries, opt->max_readdir); | |
1628 | ||
1629 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
1630 | req->r_num_caps = num_entries + 1; | |
1631 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
1632 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
1633 | return 0; | |
1634 | } | |
1635 | ||
2f2dc053 SW |
1636 | /* |
1637 | * Create an mds request. | |
1638 | */ | |
1639 | struct ceph_mds_request * | |
1640 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1641 | { | |
1642 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1643 | ||
1644 | if (!req) | |
1645 | return ERR_PTR(-ENOMEM); | |
1646 | ||
b4556396 | 1647 | mutex_init(&req->r_fill_mutex); |
37151668 | 1648 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1649 | req->r_started = jiffies; |
1650 | req->r_resend_mds = -1; | |
1651 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
68cd5b4b | 1652 | INIT_LIST_HEAD(&req->r_unsafe_target_item); |
2f2dc053 | 1653 | req->r_fmode = -1; |
153c8e6b | 1654 | kref_init(&req->r_kref); |
fcd00b68 | 1655 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
1656 | INIT_LIST_HEAD(&req->r_wait); |
1657 | init_completion(&req->r_completion); | |
1658 | init_completion(&req->r_safe_completion); | |
1659 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1660 | ||
8bbd4714 | 1661 | req->r_stamp = current_fs_time(mdsc->fsc->sb); |
b8e69066 | 1662 | |
2f2dc053 SW |
1663 | req->r_op = op; |
1664 | req->r_direct_mode = mode; | |
1665 | return req; | |
1666 | } | |
1667 | ||
1668 | /* | |
44ca18f2 | 1669 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1670 | * |
1671 | * called under mdsc->mutex. | |
1672 | */ | |
44ca18f2 SW |
1673 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1674 | { | |
1675 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1676 | return NULL; | |
1677 | return rb_entry(rb_first(&mdsc->request_tree), | |
1678 | struct ceph_mds_request, r_node); | |
1679 | } | |
1680 | ||
e8a7b8b1 | 1681 | static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
2f2dc053 | 1682 | { |
e8a7b8b1 | 1683 | return mdsc->oldest_tid; |
2f2dc053 SW |
1684 | } |
1685 | ||
1686 | /* | |
1687 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1688 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1689 | * | |
1690 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1691 | * inode. | |
1692 | * | |
1693 | * Encode hidden .snap dirs as a double /, i.e. | |
1694 | * foo/.snap/bar -> foo//bar | |
1695 | */ | |
1696 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1697 | int stop_on_nosnap) | |
1698 | { | |
1699 | struct dentry *temp; | |
1700 | char *path; | |
1701 | int len, pos; | |
1b71fe2e | 1702 | unsigned seq; |
2f2dc053 SW |
1703 | |
1704 | if (dentry == NULL) | |
1705 | return ERR_PTR(-EINVAL); | |
1706 | ||
1707 | retry: | |
1708 | len = 0; | |
1b71fe2e AV |
1709 | seq = read_seqbegin(&rename_lock); |
1710 | rcu_read_lock(); | |
2f2dc053 | 1711 | for (temp = dentry; !IS_ROOT(temp);) { |
2b0143b5 | 1712 | struct inode *inode = d_inode(temp); |
2f2dc053 SW |
1713 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) |
1714 | len++; /* slash only */ | |
1715 | else if (stop_on_nosnap && inode && | |
1716 | ceph_snap(inode) == CEPH_NOSNAP) | |
1717 | break; | |
1718 | else | |
1719 | len += 1 + temp->d_name.len; | |
1720 | temp = temp->d_parent; | |
2f2dc053 | 1721 | } |
1b71fe2e | 1722 | rcu_read_unlock(); |
2f2dc053 SW |
1723 | if (len) |
1724 | len--; /* no leading '/' */ | |
1725 | ||
1726 | path = kmalloc(len+1, GFP_NOFS); | |
1727 | if (path == NULL) | |
1728 | return ERR_PTR(-ENOMEM); | |
1729 | pos = len; | |
1730 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1731 | rcu_read_lock(); |
2f2dc053 | 1732 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1733 | struct inode *inode; |
2f2dc053 | 1734 | |
1b71fe2e | 1735 | spin_lock(&temp->d_lock); |
2b0143b5 | 1736 | inode = d_inode(temp); |
2f2dc053 | 1737 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1738 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1739 | pos, temp); |
1740 | } else if (stop_on_nosnap && inode && | |
1741 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1742 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1743 | break; |
1744 | } else { | |
1745 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1746 | if (pos < 0) { |
1747 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1748 | break; |
1b71fe2e | 1749 | } |
2f2dc053 SW |
1750 | strncpy(path + pos, temp->d_name.name, |
1751 | temp->d_name.len); | |
2f2dc053 | 1752 | } |
1b71fe2e | 1753 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1754 | if (pos) |
1755 | path[--pos] = '/'; | |
1756 | temp = temp->d_parent; | |
2f2dc053 | 1757 | } |
1b71fe2e AV |
1758 | rcu_read_unlock(); |
1759 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1760 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1761 | "expected, namelen is %d, pos is %d\n", len, pos); |
1762 | /* presumably this is only possible if racing with a | |
1763 | rename of one of the parent directories (we can not | |
1764 | lock the dentries above us to prevent this, but | |
1765 | retrying should be harmless) */ | |
1766 | kfree(path); | |
1767 | goto retry; | |
1768 | } | |
1769 | ||
2b0143b5 | 1770 | *base = ceph_ino(d_inode(temp)); |
2f2dc053 | 1771 | *plen = len; |
104648ad | 1772 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1773 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1774 | return path; |
1775 | } | |
1776 | ||
1777 | static int build_dentry_path(struct dentry *dentry, | |
1778 | const char **ppath, int *ppathlen, u64 *pino, | |
1779 | int *pfreepath) | |
1780 | { | |
1781 | char *path; | |
1782 | ||
2b0143b5 DH |
1783 | if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) { |
1784 | *pino = ceph_ino(d_inode(dentry->d_parent)); | |
2f2dc053 SW |
1785 | *ppath = dentry->d_name.name; |
1786 | *ppathlen = dentry->d_name.len; | |
1787 | return 0; | |
1788 | } | |
1789 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1790 | if (IS_ERR(path)) | |
1791 | return PTR_ERR(path); | |
1792 | *ppath = path; | |
1793 | *pfreepath = 1; | |
1794 | return 0; | |
1795 | } | |
1796 | ||
1797 | static int build_inode_path(struct inode *inode, | |
1798 | const char **ppath, int *ppathlen, u64 *pino, | |
1799 | int *pfreepath) | |
1800 | { | |
1801 | struct dentry *dentry; | |
1802 | char *path; | |
1803 | ||
1804 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1805 | *pino = ceph_ino(inode); | |
1806 | *ppathlen = 0; | |
1807 | return 0; | |
1808 | } | |
1809 | dentry = d_find_alias(inode); | |
1810 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1811 | dput(dentry); | |
1812 | if (IS_ERR(path)) | |
1813 | return PTR_ERR(path); | |
1814 | *ppath = path; | |
1815 | *pfreepath = 1; | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | /* | |
1820 | * request arguments may be specified via an inode *, a dentry *, or | |
1821 | * an explicit ino+path. | |
1822 | */ | |
1823 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1824 | const char *rpath, u64 rino, | |
1825 | const char **ppath, int *pathlen, | |
1826 | u64 *ino, int *freepath) | |
1827 | { | |
1828 | int r = 0; | |
1829 | ||
1830 | if (rinode) { | |
1831 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1832 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1833 | ceph_snap(rinode)); | |
1834 | } else if (rdentry) { | |
1835 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1836 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1837 | *ppath); | |
795858db | 1838 | } else if (rpath || rino) { |
2f2dc053 SW |
1839 | *ino = rino; |
1840 | *ppath = rpath; | |
b000056a | 1841 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1842 | dout(" path %.*s\n", *pathlen, rpath); |
1843 | } | |
1844 | ||
1845 | return r; | |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * called under mdsc->mutex | |
1850 | */ | |
1851 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1852 | struct ceph_mds_request *req, | |
6e6f0923 | 1853 | int mds, bool drop_cap_releases) |
2f2dc053 SW |
1854 | { |
1855 | struct ceph_msg *msg; | |
1856 | struct ceph_mds_request_head *head; | |
1857 | const char *path1 = NULL; | |
1858 | const char *path2 = NULL; | |
1859 | u64 ino1 = 0, ino2 = 0; | |
1860 | int pathlen1 = 0, pathlen2 = 0; | |
1861 | int freepath1 = 0, freepath2 = 0; | |
1862 | int len; | |
1863 | u16 releases; | |
1864 | void *p, *end; | |
1865 | int ret; | |
1866 | ||
1867 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1868 | req->r_path1, req->r_ino1.ino, | |
1869 | &path1, &pathlen1, &ino1, &freepath1); | |
1870 | if (ret < 0) { | |
1871 | msg = ERR_PTR(ret); | |
1872 | goto out; | |
1873 | } | |
1874 | ||
1875 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1876 | req->r_path2, req->r_ino2.ino, | |
1877 | &path2, &pathlen2, &ino2, &freepath2); | |
1878 | if (ret < 0) { | |
1879 | msg = ERR_PTR(ret); | |
1880 | goto out_free1; | |
1881 | } | |
1882 | ||
1883 | len = sizeof(*head) + | |
b8e69066 | 1884 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
777d738a | 1885 | sizeof(struct ceph_timespec); |
2f2dc053 SW |
1886 | |
1887 | /* calculate (max) length for cap releases */ | |
1888 | len += sizeof(struct ceph_mds_request_release) * | |
1889 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1890 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1891 | if (req->r_dentry_drop) | |
1892 | len += req->r_dentry->d_name.len; | |
1893 | if (req->r_old_dentry_drop) | |
1894 | len += req->r_old_dentry->d_name.len; | |
1895 | ||
b61c2763 | 1896 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
1897 | if (!msg) { |
1898 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1899 | goto out_free2; |
a79832f2 | 1900 | } |
2f2dc053 | 1901 | |
7cfa0313 | 1902 | msg->hdr.version = cpu_to_le16(2); |
6df058c0 SW |
1903 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1904 | ||
2f2dc053 SW |
1905 | head = msg->front.iov_base; |
1906 | p = msg->front.iov_base + sizeof(*head); | |
1907 | end = msg->front.iov_base + msg->front.iov_len; | |
1908 | ||
1909 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1910 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
1911 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
1912 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
1913 | head->args = req->r_args; |
1914 | ||
1915 | ceph_encode_filepath(&p, end, ino1, path1); | |
1916 | ceph_encode_filepath(&p, end, ino2, path2); | |
1917 | ||
e979cf50 SW |
1918 | /* make note of release offset, in case we need to replay */ |
1919 | req->r_request_release_offset = p - msg->front.iov_base; | |
1920 | ||
2f2dc053 SW |
1921 | /* cap releases */ |
1922 | releases = 0; | |
1923 | if (req->r_inode_drop) | |
1924 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 1925 | req->r_inode ? req->r_inode : d_inode(req->r_dentry), |
2f2dc053 SW |
1926 | mds, req->r_inode_drop, req->r_inode_unless, 0); |
1927 | if (req->r_dentry_drop) | |
1928 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1929 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1930 | if (req->r_old_dentry_drop) | |
1931 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1932 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1933 | if (req->r_old_inode_drop) | |
1934 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 1935 | d_inode(req->r_old_dentry), |
2f2dc053 | 1936 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); |
6e6f0923 YZ |
1937 | |
1938 | if (drop_cap_releases) { | |
1939 | releases = 0; | |
1940 | p = msg->front.iov_base + req->r_request_release_offset; | |
1941 | } | |
1942 | ||
2f2dc053 SW |
1943 | head->num_releases = cpu_to_le16(releases); |
1944 | ||
b8e69066 | 1945 | /* time stamp */ |
1f041a89 YZ |
1946 | { |
1947 | struct ceph_timespec ts; | |
1948 | ceph_encode_timespec(&ts, &req->r_stamp); | |
1949 | ceph_encode_copy(&p, &ts, sizeof(ts)); | |
1950 | } | |
b8e69066 | 1951 | |
2f2dc053 SW |
1952 | BUG_ON(p > end); |
1953 | msg->front.iov_len = p - msg->front.iov_base; | |
1954 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1955 | ||
25e6bae3 YZ |
1956 | if (req->r_pagelist) { |
1957 | struct ceph_pagelist *pagelist = req->r_pagelist; | |
1958 | atomic_inc(&pagelist->refcnt); | |
1959 | ceph_msg_data_add_pagelist(msg, pagelist); | |
1960 | msg->hdr.data_len = cpu_to_le32(pagelist->length); | |
1961 | } else { | |
1962 | msg->hdr.data_len = 0; | |
ebf18f47 | 1963 | } |
02afca6c | 1964 | |
2f2dc053 SW |
1965 | msg->hdr.data_off = cpu_to_le16(0); |
1966 | ||
1967 | out_free2: | |
1968 | if (freepath2) | |
1969 | kfree((char *)path2); | |
1970 | out_free1: | |
1971 | if (freepath1) | |
1972 | kfree((char *)path1); | |
1973 | out: | |
1974 | return msg; | |
1975 | } | |
1976 | ||
1977 | /* | |
1978 | * called under mdsc->mutex if error, under no mutex if | |
1979 | * success. | |
1980 | */ | |
1981 | static void complete_request(struct ceph_mds_client *mdsc, | |
1982 | struct ceph_mds_request *req) | |
1983 | { | |
1984 | if (req->r_callback) | |
1985 | req->r_callback(mdsc, req); | |
1986 | else | |
03066f23 | 1987 | complete_all(&req->r_completion); |
2f2dc053 SW |
1988 | } |
1989 | ||
1990 | /* | |
1991 | * called under mdsc->mutex | |
1992 | */ | |
1993 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1994 | struct ceph_mds_request *req, | |
6e6f0923 | 1995 | int mds, bool drop_cap_releases) |
2f2dc053 SW |
1996 | { |
1997 | struct ceph_mds_request_head *rhead; | |
1998 | struct ceph_msg *msg; | |
1999 | int flags = 0; | |
2000 | ||
2f2dc053 | 2001 | req->r_attempts++; |
e55b71f8 GF |
2002 | if (req->r_inode) { |
2003 | struct ceph_cap *cap = | |
2004 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
2005 | ||
2006 | if (cap) | |
2007 | req->r_sent_on_mseq = cap->mseq; | |
2008 | else | |
2009 | req->r_sent_on_mseq = -1; | |
2010 | } | |
2f2dc053 SW |
2011 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
2012 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
2013 | ||
01a92f17 | 2014 | if (req->r_got_unsafe) { |
c5c9a0bf | 2015 | void *p; |
01a92f17 SW |
2016 | /* |
2017 | * Replay. Do not regenerate message (and rebuild | |
2018 | * paths, etc.); just use the original message. | |
2019 | * Rebuilding paths will break for renames because | |
2020 | * d_move mangles the src name. | |
2021 | */ | |
2022 | msg = req->r_request; | |
2023 | rhead = msg->front.iov_base; | |
2024 | ||
2025 | flags = le32_to_cpu(rhead->flags); | |
2026 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2027 | rhead->flags = cpu_to_le32(flags); | |
2028 | ||
2029 | if (req->r_target_inode) | |
2030 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
2031 | ||
2032 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
2033 | |
2034 | /* remove cap/dentry releases from message */ | |
2035 | rhead->num_releases = 0; | |
c5c9a0bf YZ |
2036 | |
2037 | /* time stamp */ | |
2038 | p = msg->front.iov_base + req->r_request_release_offset; | |
1f041a89 YZ |
2039 | { |
2040 | struct ceph_timespec ts; | |
2041 | ceph_encode_timespec(&ts, &req->r_stamp); | |
2042 | ceph_encode_copy(&p, &ts, sizeof(ts)); | |
2043 | } | |
c5c9a0bf YZ |
2044 | |
2045 | msg->front.iov_len = p - msg->front.iov_base; | |
2046 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
01a92f17 SW |
2047 | return 0; |
2048 | } | |
2049 | ||
2f2dc053 SW |
2050 | if (req->r_request) { |
2051 | ceph_msg_put(req->r_request); | |
2052 | req->r_request = NULL; | |
2053 | } | |
6e6f0923 | 2054 | msg = create_request_message(mdsc, req, mds, drop_cap_releases); |
2f2dc053 | 2055 | if (IS_ERR(msg)) { |
e1518c7c | 2056 | req->r_err = PTR_ERR(msg); |
a79832f2 | 2057 | return PTR_ERR(msg); |
2f2dc053 SW |
2058 | } |
2059 | req->r_request = msg; | |
2060 | ||
2061 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
2062 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
2063 | if (req->r_got_unsafe) | |
2064 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2065 | if (req->r_locked_dir) | |
2066 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
2067 | rhead->flags = cpu_to_le32(flags); | |
2068 | rhead->num_fwd = req->r_num_fwd; | |
2069 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 2070 | rhead->ino = 0; |
2f2dc053 SW |
2071 | |
2072 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
2073 | return 0; |
2074 | } | |
2075 | ||
2076 | /* | |
2077 | * send request, or put it on the appropriate wait list. | |
2078 | */ | |
2079 | static int __do_request(struct ceph_mds_client *mdsc, | |
2080 | struct ceph_mds_request *req) | |
2081 | { | |
2082 | struct ceph_mds_session *session = NULL; | |
2083 | int mds = -1; | |
48fec5d0 | 2084 | int err = 0; |
2f2dc053 | 2085 | |
eb1b8af3 YZ |
2086 | if (req->r_err || req->r_got_result) { |
2087 | if (req->r_aborted) | |
2088 | __unregister_request(mdsc, req); | |
2f2dc053 | 2089 | goto out; |
eb1b8af3 | 2090 | } |
2f2dc053 SW |
2091 | |
2092 | if (req->r_timeout && | |
2093 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
2094 | dout("do_request timed out\n"); | |
2095 | err = -EIO; | |
2096 | goto finish; | |
2097 | } | |
48fec5d0 YZ |
2098 | if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
2099 | dout("do_request forced umount\n"); | |
2100 | err = -EIO; | |
2101 | goto finish; | |
2102 | } | |
2f2dc053 | 2103 | |
dc69e2e9 SW |
2104 | put_request_session(req); |
2105 | ||
2f2dc053 SW |
2106 | mds = __choose_mds(mdsc, req); |
2107 | if (mds < 0 || | |
2108 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
430afbad YZ |
2109 | if (mdsc->mdsmap_err) { |
2110 | err = mdsc->mdsmap_err; | |
2111 | dout("do_request mdsmap err %d\n", err); | |
2112 | goto finish; | |
2113 | } | |
2f2dc053 SW |
2114 | dout("do_request no mds or not active, waiting for map\n"); |
2115 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2116 | goto out; | |
2117 | } | |
2118 | ||
2119 | /* get, open session */ | |
2120 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 2121 | if (!session) { |
2f2dc053 | 2122 | session = register_session(mdsc, mds); |
9c423956 SW |
2123 | if (IS_ERR(session)) { |
2124 | err = PTR_ERR(session); | |
2125 | goto finish; | |
2126 | } | |
2127 | } | |
dc69e2e9 SW |
2128 | req->r_session = get_session(session); |
2129 | ||
2f2dc053 | 2130 | dout("do_request mds%d session %p state %s\n", mds, session, |
a687ecaf | 2131 | ceph_session_state_name(session->s_state)); |
2f2dc053 SW |
2132 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
2133 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
2134 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
2135 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
2136 | __open_session(mdsc, session); | |
2137 | list_add(&req->r_wait, &session->s_waiting); | |
2138 | goto out_session; | |
2139 | } | |
2140 | ||
2141 | /* send request */ | |
2f2dc053 SW |
2142 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2143 | ||
2144 | if (req->r_request_started == 0) /* note request start time */ | |
2145 | req->r_request_started = jiffies; | |
2146 | ||
6e6f0923 | 2147 | err = __prepare_send_request(mdsc, req, mds, false); |
2f2dc053 SW |
2148 | if (!err) { |
2149 | ceph_msg_get(req->r_request); | |
2150 | ceph_con_send(&session->s_con, req->r_request); | |
2151 | } | |
2152 | ||
2153 | out_session: | |
2154 | ceph_put_mds_session(session); | |
48fec5d0 YZ |
2155 | finish: |
2156 | if (err) { | |
2157 | dout("__do_request early error %d\n", err); | |
2158 | req->r_err = err; | |
2159 | complete_request(mdsc, req); | |
2160 | __unregister_request(mdsc, req); | |
2161 | } | |
2f2dc053 SW |
2162 | out: |
2163 | return err; | |
2f2dc053 SW |
2164 | } |
2165 | ||
2166 | /* | |
2167 | * called under mdsc->mutex | |
2168 | */ | |
2169 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
2170 | struct list_head *head) | |
2171 | { | |
ed75ec2c YZ |
2172 | struct ceph_mds_request *req; |
2173 | LIST_HEAD(tmp_list); | |
2174 | ||
2175 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 2176 | |
ed75ec2c YZ |
2177 | while (!list_empty(&tmp_list)) { |
2178 | req = list_entry(tmp_list.next, | |
2179 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2180 | list_del_init(&req->r_wait); |
7971bd92 | 2181 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2182 | __do_request(mdsc, req); |
2183 | } | |
2184 | } | |
2185 | ||
2186 | /* | |
2187 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2188 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2189 | */ |
29790f26 | 2190 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2191 | { |
44ca18f2 | 2192 | struct ceph_mds_request *req; |
282c1052 | 2193 | struct rb_node *p = rb_first(&mdsc->request_tree); |
2f2dc053 SW |
2194 | |
2195 | dout("kick_requests mds%d\n", mds); | |
282c1052 | 2196 | while (p) { |
44ca18f2 | 2197 | req = rb_entry(p, struct ceph_mds_request, r_node); |
282c1052 | 2198 | p = rb_next(p); |
44ca18f2 SW |
2199 | if (req->r_got_unsafe) |
2200 | continue; | |
3de22be6 YZ |
2201 | if (req->r_attempts > 0) |
2202 | continue; /* only new requests */ | |
44ca18f2 SW |
2203 | if (req->r_session && |
2204 | req->r_session->s_mds == mds) { | |
2205 | dout(" kicking tid %llu\n", req->r_tid); | |
03974e81 | 2206 | list_del_init(&req->r_wait); |
44ca18f2 | 2207 | __do_request(mdsc, req); |
2f2dc053 SW |
2208 | } |
2209 | } | |
2210 | } | |
2211 | ||
2212 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2213 | struct ceph_mds_request *req) | |
2214 | { | |
2215 | dout("submit_request on %p\n", req); | |
2216 | mutex_lock(&mdsc->mutex); | |
2217 | __register_request(mdsc, req, NULL); | |
2218 | __do_request(mdsc, req); | |
2219 | mutex_unlock(&mdsc->mutex); | |
2220 | } | |
2221 | ||
2222 | /* | |
2223 | * Synchrously perform an mds request. Take care of all of the | |
2224 | * session setup, forwarding, retry details. | |
2225 | */ | |
2226 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2227 | struct inode *dir, | |
2228 | struct ceph_mds_request *req) | |
2229 | { | |
2230 | int err; | |
2231 | ||
2232 | dout("do_request on %p\n", req); | |
2233 | ||
2234 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
2235 | if (req->r_inode) | |
2236 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
2237 | if (req->r_locked_dir) | |
2238 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
844d87c3 | 2239 | if (req->r_old_dentry_dir) |
41b02e1f SW |
2240 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2241 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2242 | |
2243 | /* issue */ | |
2244 | mutex_lock(&mdsc->mutex); | |
2245 | __register_request(mdsc, req, dir); | |
2246 | __do_request(mdsc, req); | |
2247 | ||
e1518c7c SW |
2248 | if (req->r_err) { |
2249 | err = req->r_err; | |
e1518c7c | 2250 | goto out; |
2f2dc053 SW |
2251 | } |
2252 | ||
e1518c7c SW |
2253 | /* wait */ |
2254 | mutex_unlock(&mdsc->mutex); | |
2255 | dout("do_request waiting\n"); | |
5be73034 | 2256 | if (!req->r_timeout && req->r_wait_for_completion) { |
9280be24 | 2257 | err = req->r_wait_for_completion(mdsc, req); |
e1518c7c | 2258 | } else { |
5be73034 ID |
2259 | long timeleft = wait_for_completion_killable_timeout( |
2260 | &req->r_completion, | |
2261 | ceph_timeout_jiffies(req->r_timeout)); | |
2262 | if (timeleft > 0) | |
2263 | err = 0; | |
2264 | else if (!timeleft) | |
2265 | err = -EIO; /* timed out */ | |
2266 | else | |
2267 | err = timeleft; /* killed */ | |
e1518c7c SW |
2268 | } |
2269 | dout("do_request waited, got %d\n", err); | |
2270 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2271 | |
e1518c7c SW |
2272 | /* only abort if we didn't race with a real reply */ |
2273 | if (req->r_got_result) { | |
2274 | err = le32_to_cpu(req->r_reply_info.head->result); | |
2275 | } else if (err < 0) { | |
2276 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2277 | |
2278 | /* | |
2279 | * ensure we aren't running concurrently with | |
2280 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2281 | * rely on locks (dir mutex) held by our caller. | |
2282 | */ | |
2283 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
2284 | req->r_err = err; |
2285 | req->r_aborted = true; | |
b4556396 | 2286 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2287 | |
e1518c7c | 2288 | if (req->r_locked_dir && |
167c9e35 SW |
2289 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2290 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2291 | } else { |
e1518c7c | 2292 | err = req->r_err; |
2f2dc053 | 2293 | } |
2f2dc053 | 2294 | |
e1518c7c SW |
2295 | out: |
2296 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2297 | dout("do_request %p done, result %d\n", req, err); |
2298 | return err; | |
2299 | } | |
2300 | ||
167c9e35 | 2301 | /* |
2f276c51 | 2302 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2303 | * namespace request. |
2304 | */ | |
2305 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2306 | { | |
2307 | struct inode *inode = req->r_locked_dir; | |
167c9e35 | 2308 | |
2f276c51 | 2309 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2310 | |
2f276c51 | 2311 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2312 | if (req->r_dentry) |
2313 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2314 | if (req->r_old_dentry) | |
2315 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2316 | } | |
2317 | ||
2f2dc053 SW |
2318 | /* |
2319 | * Handle mds reply. | |
2320 | * | |
2321 | * We take the session mutex and parse and process the reply immediately. | |
2322 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2323 | * by the MDS as they are applied to our local cache. | |
2324 | */ | |
2325 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2326 | { | |
2327 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2328 | struct ceph_mds_request *req; | |
2329 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2330 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
982d6011 | 2331 | struct ceph_snap_realm *realm; |
2f2dc053 SW |
2332 | u64 tid; |
2333 | int err, result; | |
2600d2dd | 2334 | int mds = session->s_mds; |
2f2dc053 | 2335 | |
2f2dc053 SW |
2336 | if (msg->front.iov_len < sizeof(*head)) { |
2337 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2338 | ceph_msg_dump(msg); |
2f2dc053 SW |
2339 | return; |
2340 | } | |
2341 | ||
2342 | /* get request, session */ | |
6df058c0 | 2343 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 | 2344 | mutex_lock(&mdsc->mutex); |
fcd00b68 | 2345 | req = lookup_get_request(mdsc, tid); |
2f2dc053 SW |
2346 | if (!req) { |
2347 | dout("handle_reply on unknown tid %llu\n", tid); | |
2348 | mutex_unlock(&mdsc->mutex); | |
2349 | return; | |
2350 | } | |
2351 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2352 | |
2353 | /* correct session? */ | |
d96d6049 | 2354 | if (req->r_session != session) { |
2f2dc053 SW |
2355 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2356 | " not mds%d\n", tid, session->s_mds, | |
2357 | req->r_session ? req->r_session->s_mds : -1); | |
2358 | mutex_unlock(&mdsc->mutex); | |
2359 | goto out; | |
2360 | } | |
2361 | ||
2362 | /* dup? */ | |
2363 | if ((req->r_got_unsafe && !head->safe) || | |
2364 | (req->r_got_safe && head->safe)) { | |
f3ae1b97 | 2365 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
2366 | head->safe ? "safe" : "unsafe", tid, mds); |
2367 | mutex_unlock(&mdsc->mutex); | |
2368 | goto out; | |
2369 | } | |
1550d34e | 2370 | if (req->r_got_safe) { |
f3ae1b97 | 2371 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
2372 | tid, mds); |
2373 | mutex_unlock(&mdsc->mutex); | |
2374 | goto out; | |
2375 | } | |
2f2dc053 SW |
2376 | |
2377 | result = le32_to_cpu(head->result); | |
2378 | ||
2379 | /* | |
e55b71f8 GF |
2380 | * Handle an ESTALE |
2381 | * if we're not talking to the authority, send to them | |
2382 | * if the authority has changed while we weren't looking, | |
2383 | * send to new authority | |
2384 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2385 | */ |
2386 | if (result == -ESTALE) { | |
e55b71f8 | 2387 | dout("got ESTALE on request %llu", req->r_tid); |
51da8e8c | 2388 | req->r_resend_mds = -1; |
ca18bede | 2389 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2390 | dout("not using auth, setting for that now"); |
2391 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2392 | __do_request(mdsc, req); |
2393 | mutex_unlock(&mdsc->mutex); | |
2394 | goto out; | |
e55b71f8 | 2395 | } else { |
ca18bede YZ |
2396 | int mds = __choose_mds(mdsc, req); |
2397 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2398 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2399 | __do_request(mdsc, req); |
2400 | mutex_unlock(&mdsc->mutex); | |
2401 | goto out; | |
2402 | } | |
2f2dc053 | 2403 | } |
e55b71f8 | 2404 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2405 | } |
2406 | ||
e55b71f8 | 2407 | |
2f2dc053 SW |
2408 | if (head->safe) { |
2409 | req->r_got_safe = true; | |
2410 | __unregister_request(mdsc, req); | |
2f2dc053 SW |
2411 | |
2412 | if (req->r_got_unsafe) { | |
2413 | /* | |
2414 | * We already handled the unsafe response, now do the | |
2415 | * cleanup. No need to examine the response; the MDS | |
2416 | * doesn't include any result info in the safe | |
2417 | * response. And even if it did, there is nothing | |
2418 | * useful we could do with a revised return value. | |
2419 | */ | |
2420 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2421 | list_del_init(&req->r_unsafe_item); | |
2422 | ||
2423 | /* last unsafe request during umount? */ | |
44ca18f2 | 2424 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2425 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2426 | mutex_unlock(&mdsc->mutex); |
2427 | goto out; | |
2428 | } | |
e1518c7c | 2429 | } else { |
2f2dc053 SW |
2430 | req->r_got_unsafe = true; |
2431 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
4c06ace8 YZ |
2432 | if (req->r_unsafe_dir) { |
2433 | struct ceph_inode_info *ci = | |
2434 | ceph_inode(req->r_unsafe_dir); | |
2435 | spin_lock(&ci->i_unsafe_lock); | |
2436 | list_add_tail(&req->r_unsafe_dir_item, | |
2437 | &ci->i_unsafe_dirops); | |
2438 | spin_unlock(&ci->i_unsafe_lock); | |
2439 | } | |
2f2dc053 SW |
2440 | } |
2441 | ||
2442 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2443 | rinfo = &req->r_reply_info; | |
14303d20 | 2444 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2445 | mutex_unlock(&mdsc->mutex); |
2446 | ||
2447 | mutex_lock(&session->s_mutex); | |
2448 | if (err < 0) { | |
25933abd | 2449 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2450 | ceph_msg_dump(msg); |
2f2dc053 SW |
2451 | goto out_err; |
2452 | } | |
2453 | ||
2454 | /* snap trace */ | |
982d6011 | 2455 | realm = NULL; |
2f2dc053 SW |
2456 | if (rinfo->snapblob_len) { |
2457 | down_write(&mdsc->snap_rwsem); | |
2458 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
982d6011 YZ |
2459 | rinfo->snapblob + rinfo->snapblob_len, |
2460 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, | |
2461 | &realm); | |
2f2dc053 SW |
2462 | downgrade_write(&mdsc->snap_rwsem); |
2463 | } else { | |
2464 | down_read(&mdsc->snap_rwsem); | |
2465 | } | |
2466 | ||
2467 | /* insert trace into our cache */ | |
b4556396 | 2468 | mutex_lock(&req->r_fill_mutex); |
315f2408 | 2469 | current->journal_info = req; |
3d14c5d2 | 2470 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2471 | if (err == 0) { |
6e8575fa | 2472 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2473 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2474 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2475 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2476 | } |
315f2408 | 2477 | current->journal_info = NULL; |
b4556396 | 2478 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2479 | |
2480 | up_read(&mdsc->snap_rwsem); | |
982d6011 YZ |
2481 | if (realm) |
2482 | ceph_put_snap_realm(mdsc, realm); | |
68cd5b4b YZ |
2483 | |
2484 | if (err == 0 && req->r_got_unsafe && req->r_target_inode) { | |
2485 | struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); | |
2486 | spin_lock(&ci->i_unsafe_lock); | |
2487 | list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops); | |
2488 | spin_unlock(&ci->i_unsafe_lock); | |
2489 | } | |
2f2dc053 | 2490 | out_err: |
e1518c7c SW |
2491 | mutex_lock(&mdsc->mutex); |
2492 | if (!req->r_aborted) { | |
2493 | if (err) { | |
2494 | req->r_err = err; | |
2495 | } else { | |
5fdb1389 | 2496 | req->r_reply = ceph_msg_get(msg); |
e1518c7c SW |
2497 | req->r_got_result = true; |
2498 | } | |
2f2dc053 | 2499 | } else { |
e1518c7c | 2500 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2501 | } |
e1518c7c | 2502 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2503 | |
2f2dc053 SW |
2504 | mutex_unlock(&session->s_mutex); |
2505 | ||
2506 | /* kick calling process */ | |
2507 | complete_request(mdsc, req); | |
2508 | out: | |
2509 | ceph_mdsc_put_request(req); | |
2510 | return; | |
2511 | } | |
2512 | ||
2513 | ||
2514 | ||
2515 | /* | |
2516 | * handle mds notification that our request has been forwarded. | |
2517 | */ | |
2600d2dd SW |
2518 | static void handle_forward(struct ceph_mds_client *mdsc, |
2519 | struct ceph_mds_session *session, | |
2520 | struct ceph_msg *msg) | |
2f2dc053 SW |
2521 | { |
2522 | struct ceph_mds_request *req; | |
a1ea787c | 2523 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2524 | u32 next_mds; |
2525 | u32 fwd_seq; | |
2f2dc053 SW |
2526 | int err = -EINVAL; |
2527 | void *p = msg->front.iov_base; | |
2528 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2529 | |
a1ea787c | 2530 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2531 | next_mds = ceph_decode_32(&p); |
2532 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2533 | |
2534 | mutex_lock(&mdsc->mutex); | |
fcd00b68 | 2535 | req = lookup_get_request(mdsc, tid); |
2f2dc053 | 2536 | if (!req) { |
2a8e5e36 | 2537 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2538 | goto out; /* dup reply? */ |
2539 | } | |
2540 | ||
2a8e5e36 SW |
2541 | if (req->r_aborted) { |
2542 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2543 | __unregister_request(mdsc, req); | |
2544 | } else if (fwd_seq <= req->r_num_fwd) { | |
2545 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2546 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2547 | } else { | |
2548 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2549 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2550 | BUG_ON(req->r_err); | |
2551 | BUG_ON(req->r_got_result); | |
3de22be6 | 2552 | req->r_attempts = 0; |
2f2dc053 SW |
2553 | req->r_num_fwd = fwd_seq; |
2554 | req->r_resend_mds = next_mds; | |
2555 | put_request_session(req); | |
2556 | __do_request(mdsc, req); | |
2557 | } | |
2558 | ceph_mdsc_put_request(req); | |
2559 | out: | |
2560 | mutex_unlock(&mdsc->mutex); | |
2561 | return; | |
2562 | ||
2563 | bad: | |
2564 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2565 | } | |
2566 | ||
2567 | /* | |
2568 | * handle a mds session control message | |
2569 | */ | |
2570 | static void handle_session(struct ceph_mds_session *session, | |
2571 | struct ceph_msg *msg) | |
2572 | { | |
2573 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2574 | u32 op; | |
2575 | u64 seq; | |
2600d2dd | 2576 | int mds = session->s_mds; |
2f2dc053 SW |
2577 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2578 | int wake = 0; | |
2579 | ||
2f2dc053 SW |
2580 | /* decode */ |
2581 | if (msg->front.iov_len != sizeof(*h)) | |
2582 | goto bad; | |
2583 | op = le32_to_cpu(h->op); | |
2584 | seq = le64_to_cpu(h->seq); | |
2585 | ||
2586 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2587 | if (op == CEPH_SESSION_CLOSE) |
2588 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2589 | /* FIXME: this ttl calculation is generous */ |
2590 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2591 | mutex_unlock(&mdsc->mutex); | |
2592 | ||
2593 | mutex_lock(&session->s_mutex); | |
2594 | ||
2595 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2596 | mds, ceph_session_op_name(op), session, | |
a687ecaf | 2597 | ceph_session_state_name(session->s_state), seq); |
2f2dc053 SW |
2598 | |
2599 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2600 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2601 | pr_info("mds%d came back\n", session->s_mds); | |
2602 | } | |
2603 | ||
2604 | switch (op) { | |
2605 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2606 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2607 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2608 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2609 | renewed_caps(mdsc, session, 0); | |
2610 | wake = 1; | |
2611 | if (mdsc->stopping) | |
2612 | __close_session(mdsc, session); | |
2613 | break; | |
2614 | ||
2615 | case CEPH_SESSION_RENEWCAPS: | |
2616 | if (session->s_renew_seq == seq) | |
2617 | renewed_caps(mdsc, session, 1); | |
2618 | break; | |
2619 | ||
2620 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2621 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2622 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
1c841a96 | 2623 | cleanup_session_requests(mdsc, session); |
2f2dc053 | 2624 | remove_session_caps(session); |
656e4382 | 2625 | wake = 2; /* for good measure */ |
f3c60c59 | 2626 | wake_up_all(&mdsc->session_close_wq); |
2f2dc053 SW |
2627 | break; |
2628 | ||
2629 | case CEPH_SESSION_STALE: | |
2630 | pr_info("mds%d caps went stale, renewing\n", | |
2631 | session->s_mds); | |
d8fb02ab | 2632 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2633 | session->s_cap_gen++; |
1ce208a6 | 2634 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2635 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2636 | send_renew_caps(mdsc, session); |
2637 | break; | |
2638 | ||
2639 | case CEPH_SESSION_RECALL_STATE: | |
2640 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2641 | break; | |
2642 | ||
186e4f7a YZ |
2643 | case CEPH_SESSION_FLUSHMSG: |
2644 | send_flushmsg_ack(mdsc, session, seq); | |
2645 | break; | |
2646 | ||
03f4fcb0 YZ |
2647 | case CEPH_SESSION_FORCE_RO: |
2648 | dout("force_session_readonly %p\n", session); | |
2649 | spin_lock(&session->s_cap_lock); | |
2650 | session->s_readonly = true; | |
2651 | spin_unlock(&session->s_cap_lock); | |
2652 | wake_up_session_caps(session, 0); | |
2653 | break; | |
2654 | ||
2f2dc053 SW |
2655 | default: |
2656 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2657 | WARN_ON(1); | |
2658 | } | |
2659 | ||
2660 | mutex_unlock(&session->s_mutex); | |
2661 | if (wake) { | |
2662 | mutex_lock(&mdsc->mutex); | |
2663 | __wake_requests(mdsc, &session->s_waiting); | |
656e4382 YZ |
2664 | if (wake == 2) |
2665 | kick_requests(mdsc, mds); | |
2f2dc053 SW |
2666 | mutex_unlock(&mdsc->mutex); |
2667 | } | |
2668 | return; | |
2669 | ||
2670 | bad: | |
2671 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2672 | (int)msg->front.iov_len); | |
9ec7cab1 | 2673 | ceph_msg_dump(msg); |
2f2dc053 SW |
2674 | return; |
2675 | } | |
2676 | ||
2677 | ||
2678 | /* | |
2679 | * called under session->mutex. | |
2680 | */ | |
2681 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2682 | struct ceph_mds_session *session) | |
2683 | { | |
2684 | struct ceph_mds_request *req, *nreq; | |
3de22be6 | 2685 | struct rb_node *p; |
2f2dc053 SW |
2686 | int err; |
2687 | ||
2688 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2689 | ||
2690 | mutex_lock(&mdsc->mutex); | |
2691 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
6e6f0923 | 2692 | err = __prepare_send_request(mdsc, req, session->s_mds, true); |
2f2dc053 SW |
2693 | if (!err) { |
2694 | ceph_msg_get(req->r_request); | |
2695 | ceph_con_send(&session->s_con, req->r_request); | |
2696 | } | |
2697 | } | |
3de22be6 YZ |
2698 | |
2699 | /* | |
2700 | * also re-send old requests when MDS enters reconnect stage. So that MDS | |
2701 | * can process completed request in clientreplay stage. | |
2702 | */ | |
2703 | p = rb_first(&mdsc->request_tree); | |
2704 | while (p) { | |
2705 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
2706 | p = rb_next(p); | |
2707 | if (req->r_got_unsafe) | |
2708 | continue; | |
2709 | if (req->r_attempts == 0) | |
2710 | continue; /* only old requests */ | |
2711 | if (req->r_session && | |
2712 | req->r_session->s_mds == session->s_mds) { | |
6e6f0923 YZ |
2713 | err = __prepare_send_request(mdsc, req, |
2714 | session->s_mds, true); | |
3de22be6 YZ |
2715 | if (!err) { |
2716 | ceph_msg_get(req->r_request); | |
2717 | ceph_con_send(&session->s_con, req->r_request); | |
2718 | } | |
2719 | } | |
2720 | } | |
2f2dc053 SW |
2721 | mutex_unlock(&mdsc->mutex); |
2722 | } | |
2723 | ||
2724 | /* | |
2725 | * Encode information about a cap for a reconnect with the MDS. | |
2726 | */ | |
2f2dc053 SW |
2727 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2728 | void *arg) | |
2729 | { | |
20cb34ae SW |
2730 | union { |
2731 | struct ceph_mds_cap_reconnect v2; | |
2732 | struct ceph_mds_cap_reconnect_v1 v1; | |
2733 | } rec; | |
2f2dc053 | 2734 | struct ceph_inode_info *ci; |
20cb34ae SW |
2735 | struct ceph_reconnect_state *recon_state = arg; |
2736 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2737 | char *path; |
2738 | int pathlen, err; | |
2739 | u64 pathbase; | |
3469ed0d | 2740 | u64 snap_follows; |
2f2dc053 SW |
2741 | struct dentry *dentry; |
2742 | ||
2743 | ci = cap->ci; | |
2744 | ||
2745 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2746 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2747 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2748 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2749 | if (err) | |
2750 | return err; | |
2f2dc053 SW |
2751 | |
2752 | dentry = d_find_alias(inode); | |
2753 | if (dentry) { | |
2754 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2755 | if (IS_ERR(path)) { | |
2756 | err = PTR_ERR(path); | |
e072f8aa | 2757 | goto out_dput; |
2f2dc053 SW |
2758 | } |
2759 | } else { | |
2760 | path = NULL; | |
2761 | pathlen = 0; | |
4eacd4cb | 2762 | pathbase = 0; |
2f2dc053 | 2763 | } |
2f2dc053 | 2764 | |
be655596 | 2765 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2766 | cap->seq = 0; /* reset cap seq */ |
2767 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2768 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2769 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae | 2770 | |
121f22a1 | 2771 | if (recon_state->msg_version >= 2) { |
20cb34ae SW |
2772 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); |
2773 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2774 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2775 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2776 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2777 | rec.v2.flock_len = 0; | |
20cb34ae SW |
2778 | } else { |
2779 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2780 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2781 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2782 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2783 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2784 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2785 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2786 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
20cb34ae | 2787 | } |
3469ed0d YZ |
2788 | |
2789 | if (list_empty(&ci->i_cap_snaps)) { | |
2790 | snap_follows = 0; | |
2791 | } else { | |
2792 | struct ceph_cap_snap *capsnap = | |
2793 | list_first_entry(&ci->i_cap_snaps, | |
2794 | struct ceph_cap_snap, ci_item); | |
2795 | snap_follows = capsnap->follows; | |
20cb34ae | 2796 | } |
be655596 | 2797 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2798 | |
121f22a1 | 2799 | if (recon_state->msg_version >= 2) { |
40819f6f | 2800 | int num_fcntl_locks, num_flock_locks; |
39be95e9 | 2801 | struct ceph_filelock *flocks; |
121f22a1 YZ |
2802 | size_t struct_len, total_len = 0; |
2803 | u8 struct_v = 0; | |
39be95e9 JS |
2804 | |
2805 | encode_again: | |
39be95e9 | 2806 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); |
39be95e9 JS |
2807 | flocks = kmalloc((num_fcntl_locks+num_flock_locks) * |
2808 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2809 | if (!flocks) { | |
2810 | err = -ENOMEM; | |
2811 | goto out_free; | |
2812 | } | |
39be95e9 JS |
2813 | err = ceph_encode_locks_to_buffer(inode, flocks, |
2814 | num_fcntl_locks, | |
2815 | num_flock_locks); | |
39be95e9 JS |
2816 | if (err) { |
2817 | kfree(flocks); | |
2818 | if (err == -ENOSPC) | |
2819 | goto encode_again; | |
2820 | goto out_free; | |
2821 | } | |
121f22a1 YZ |
2822 | |
2823 | if (recon_state->msg_version >= 3) { | |
2824 | /* version, compat_version and struct_len */ | |
2825 | total_len = 2 * sizeof(u8) + sizeof(u32); | |
3469ed0d | 2826 | struct_v = 2; |
121f22a1 | 2827 | } |
39be95e9 JS |
2828 | /* |
2829 | * number of encoded locks is stable, so copy to pagelist | |
2830 | */ | |
121f22a1 YZ |
2831 | struct_len = 2 * sizeof(u32) + |
2832 | (num_fcntl_locks + num_flock_locks) * | |
2833 | sizeof(struct ceph_filelock); | |
2834 | rec.v2.flock_len = cpu_to_le32(struct_len); | |
2835 | ||
2836 | struct_len += sizeof(rec.v2); | |
2837 | struct_len += sizeof(u32) + pathlen; | |
2838 | ||
3469ed0d YZ |
2839 | if (struct_v >= 2) |
2840 | struct_len += sizeof(u64); /* snap_follows */ | |
2841 | ||
121f22a1 YZ |
2842 | total_len += struct_len; |
2843 | err = ceph_pagelist_reserve(pagelist, total_len); | |
2844 | ||
2845 | if (!err) { | |
2846 | if (recon_state->msg_version >= 3) { | |
2847 | ceph_pagelist_encode_8(pagelist, struct_v); | |
2848 | ceph_pagelist_encode_8(pagelist, 1); | |
2849 | ceph_pagelist_encode_32(pagelist, struct_len); | |
2850 | } | |
2851 | ceph_pagelist_encode_string(pagelist, path, pathlen); | |
2852 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2)); | |
2853 | ceph_locks_to_pagelist(flocks, pagelist, | |
2854 | num_fcntl_locks, | |
2855 | num_flock_locks); | |
3469ed0d YZ |
2856 | if (struct_v >= 2) |
2857 | ceph_pagelist_encode_64(pagelist, snap_follows); | |
121f22a1 | 2858 | } |
39be95e9 | 2859 | kfree(flocks); |
3612abbd | 2860 | } else { |
121f22a1 YZ |
2861 | size_t size = sizeof(u32) + pathlen + sizeof(rec.v1); |
2862 | err = ceph_pagelist_reserve(pagelist, size); | |
2863 | if (!err) { | |
2864 | ceph_pagelist_encode_string(pagelist, path, pathlen); | |
2865 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1)); | |
2866 | } | |
40819f6f | 2867 | } |
44c99757 YZ |
2868 | |
2869 | recon_state->nr_caps++; | |
e072f8aa | 2870 | out_free: |
2f2dc053 | 2871 | kfree(path); |
e072f8aa | 2872 | out_dput: |
2f2dc053 | 2873 | dput(dentry); |
93cea5be | 2874 | return err; |
2f2dc053 SW |
2875 | } |
2876 | ||
2877 | ||
2878 | /* | |
2879 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2880 | * reestablish shared state. This includes all caps issued through | |
2881 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2882 | * clear which snap realms the mds cares about, we send everything we | |
2883 | * know about.. that ensures we'll then get any new info the | |
2884 | * recovering MDS might have. | |
2885 | * | |
2886 | * This is a relatively heavyweight operation, but it's rare. | |
2887 | * | |
2888 | * called with mdsc->mutex held. | |
2889 | */ | |
34b6c855 SW |
2890 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2891 | struct ceph_mds_session *session) | |
2f2dc053 | 2892 | { |
2f2dc053 | 2893 | struct ceph_msg *reply; |
a105f00c | 2894 | struct rb_node *p; |
34b6c855 | 2895 | int mds = session->s_mds; |
9abf82b8 | 2896 | int err = -ENOMEM; |
44c99757 | 2897 | int s_nr_caps; |
93cea5be | 2898 | struct ceph_pagelist *pagelist; |
20cb34ae | 2899 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2900 | |
34b6c855 | 2901 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2902 | |
93cea5be SW |
2903 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2904 | if (!pagelist) | |
2905 | goto fail_nopagelist; | |
2906 | ceph_pagelist_init(pagelist); | |
2907 | ||
b61c2763 | 2908 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 2909 | if (!reply) |
93cea5be | 2910 | goto fail_nomsg; |
93cea5be | 2911 | |
34b6c855 SW |
2912 | mutex_lock(&session->s_mutex); |
2913 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2914 | session->s_seq = 0; | |
2f2dc053 | 2915 | |
2f2dc053 | 2916 | dout("session %p state %s\n", session, |
a687ecaf | 2917 | ceph_session_state_name(session->s_state)); |
2f2dc053 | 2918 | |
99a9c273 YZ |
2919 | spin_lock(&session->s_gen_ttl_lock); |
2920 | session->s_cap_gen++; | |
2921 | spin_unlock(&session->s_gen_ttl_lock); | |
2922 | ||
2923 | spin_lock(&session->s_cap_lock); | |
03f4fcb0 YZ |
2924 | /* don't know if session is readonly */ |
2925 | session->s_readonly = 0; | |
99a9c273 YZ |
2926 | /* |
2927 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
2928 | * If a cap get released before being added to the cap reconnect, | |
2929 | * __ceph_remove_cap() should skip queuing cap release. | |
2930 | */ | |
2931 | session->s_cap_reconnect = 1; | |
e01a5946 | 2932 | /* drop old cap expires; we're about to reestablish that state */ |
745a8e3b | 2933 | cleanup_cap_releases(mdsc, session); |
e01a5946 | 2934 | |
5d23371f | 2935 | /* trim unused caps to reduce MDS's cache rejoin time */ |
c0bd50e2 YZ |
2936 | if (mdsc->fsc->sb->s_root) |
2937 | shrink_dcache_parent(mdsc->fsc->sb->s_root); | |
5d23371f YZ |
2938 | |
2939 | ceph_con_close(&session->s_con); | |
2940 | ceph_con_open(&session->s_con, | |
2941 | CEPH_ENTITY_TYPE_MDS, mds, | |
2942 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
2943 | ||
2944 | /* replay unsafe requests */ | |
2945 | replay_unsafe_requests(mdsc, session); | |
2946 | ||
2947 | down_read(&mdsc->snap_rwsem); | |
2948 | ||
2f2dc053 | 2949 | /* traverse this session's caps */ |
44c99757 YZ |
2950 | s_nr_caps = session->s_nr_caps; |
2951 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
2952 | if (err) |
2953 | goto fail; | |
20cb34ae | 2954 | |
44c99757 | 2955 | recon_state.nr_caps = 0; |
20cb34ae | 2956 | recon_state.pagelist = pagelist; |
121f22a1 YZ |
2957 | if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) |
2958 | recon_state.msg_version = 3; | |
2959 | else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK) | |
2960 | recon_state.msg_version = 2; | |
2961 | else | |
2962 | recon_state.msg_version = 1; | |
20cb34ae | 2963 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); |
2f2dc053 | 2964 | if (err < 0) |
9abf82b8 | 2965 | goto fail; |
2f2dc053 | 2966 | |
99a9c273 YZ |
2967 | spin_lock(&session->s_cap_lock); |
2968 | session->s_cap_reconnect = 0; | |
2969 | spin_unlock(&session->s_cap_lock); | |
2970 | ||
2f2dc053 SW |
2971 | /* |
2972 | * snaprealms. we provide mds with the ino, seq (version), and | |
2973 | * parent for all of our realms. If the mds has any newer info, | |
2974 | * it will tell us. | |
2975 | */ | |
a105f00c SW |
2976 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2977 | struct ceph_snap_realm *realm = | |
2978 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2979 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2980 | |
2981 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2982 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2983 | sr_rec.ino = cpu_to_le64(realm->ino); |
2984 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2985 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2986 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2987 | if (err) | |
2988 | goto fail; | |
2f2dc053 | 2989 | } |
2f2dc053 | 2990 | |
121f22a1 | 2991 | reply->hdr.version = cpu_to_le16(recon_state.msg_version); |
44c99757 YZ |
2992 | |
2993 | /* raced with cap release? */ | |
2994 | if (s_nr_caps != recon_state.nr_caps) { | |
2995 | struct page *page = list_first_entry(&pagelist->head, | |
2996 | struct page, lru); | |
2997 | __le32 *addr = kmap_atomic(page); | |
2998 | *addr = cpu_to_le32(recon_state.nr_caps); | |
2999 | kunmap_atomic(addr); | |
ebf18f47 | 3000 | } |
44c99757 YZ |
3001 | |
3002 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
3003 | ceph_msg_data_add_pagelist(reply, pagelist); | |
e548e9b9 YZ |
3004 | |
3005 | ceph_early_kick_flushing_caps(mdsc, session); | |
3006 | ||
2f2dc053 SW |
3007 | ceph_con_send(&session->s_con, reply); |
3008 | ||
9abf82b8 SW |
3009 | mutex_unlock(&session->s_mutex); |
3010 | ||
3011 | mutex_lock(&mdsc->mutex); | |
3012 | __wake_requests(mdsc, &session->s_waiting); | |
3013 | mutex_unlock(&mdsc->mutex); | |
3014 | ||
2f2dc053 | 3015 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
3016 | return; |
3017 | ||
93cea5be | 3018 | fail: |
2f2dc053 | 3019 | ceph_msg_put(reply); |
9abf82b8 SW |
3020 | up_read(&mdsc->snap_rwsem); |
3021 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
3022 | fail_nomsg: |
3023 | ceph_pagelist_release(pagelist); | |
93cea5be | 3024 | fail_nopagelist: |
9abf82b8 | 3025 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 3026 | return; |
2f2dc053 SW |
3027 | } |
3028 | ||
3029 | ||
3030 | /* | |
3031 | * compare old and new mdsmaps, kicking requests | |
3032 | * and closing out old connections as necessary | |
3033 | * | |
3034 | * called under mdsc->mutex. | |
3035 | */ | |
3036 | static void check_new_map(struct ceph_mds_client *mdsc, | |
3037 | struct ceph_mdsmap *newmap, | |
3038 | struct ceph_mdsmap *oldmap) | |
3039 | { | |
3040 | int i; | |
3041 | int oldstate, newstate; | |
3042 | struct ceph_mds_session *s; | |
3043 | ||
3044 | dout("check_new_map new %u old %u\n", | |
3045 | newmap->m_epoch, oldmap->m_epoch); | |
3046 | ||
3047 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
3048 | if (mdsc->sessions[i] == NULL) | |
3049 | continue; | |
3050 | s = mdsc->sessions[i]; | |
3051 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
3052 | newstate = ceph_mdsmap_get_state(newmap, i); | |
3053 | ||
0deb01c9 | 3054 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 3055 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 3056 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 3057 | ceph_mds_state_name(newstate), |
0deb01c9 | 3058 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
a687ecaf | 3059 | ceph_session_state_name(s->s_state)); |
2f2dc053 | 3060 | |
3e8f43a0 YZ |
3061 | if (i >= newmap->m_max_mds || |
3062 | memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2f2dc053 SW |
3063 | ceph_mdsmap_get_addr(newmap, i), |
3064 | sizeof(struct ceph_entity_addr))) { | |
3065 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
3066 | /* the session never opened, just close it | |
3067 | * out now */ | |
3068 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 3069 | __unregister_session(mdsc, s); |
2f2dc053 SW |
3070 | } else { |
3071 | /* just close it */ | |
3072 | mutex_unlock(&mdsc->mutex); | |
3073 | mutex_lock(&s->s_mutex); | |
3074 | mutex_lock(&mdsc->mutex); | |
3075 | ceph_con_close(&s->s_con); | |
3076 | mutex_unlock(&s->s_mutex); | |
3077 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
3078 | } | |
2f2dc053 SW |
3079 | } else if (oldstate == newstate) { |
3080 | continue; /* nothing new with this mds */ | |
3081 | } | |
3082 | ||
3083 | /* | |
3084 | * send reconnect? | |
3085 | */ | |
3086 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
3087 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
3088 | mutex_unlock(&mdsc->mutex); | |
3089 | send_mds_reconnect(mdsc, s); | |
3090 | mutex_lock(&mdsc->mutex); | |
3091 | } | |
2f2dc053 SW |
3092 | |
3093 | /* | |
29790f26 | 3094 | * kick request on any mds that has gone active. |
2f2dc053 SW |
3095 | */ |
3096 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
3097 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
3098 | if (oldstate != CEPH_MDS_STATE_CREATING && |
3099 | oldstate != CEPH_MDS_STATE_STARTING) | |
3100 | pr_info("mds%d recovery completed\n", s->s_mds); | |
3101 | kick_requests(mdsc, i); | |
2f2dc053 | 3102 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 3103 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
3104 | } |
3105 | } | |
cb170a22 SW |
3106 | |
3107 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
3108 | s = mdsc->sessions[i]; | |
3109 | if (!s) | |
3110 | continue; | |
3111 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
3112 | continue; | |
3113 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
3114 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
3115 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3116 | dout(" connecting to export targets of laggy mds%d\n", | |
3117 | i); | |
3118 | __open_export_target_sessions(mdsc, s); | |
3119 | } | |
3120 | } | |
2f2dc053 SW |
3121 | } |
3122 | ||
3123 | ||
3124 | ||
3125 | /* | |
3126 | * leases | |
3127 | */ | |
3128 | ||
3129 | /* | |
3130 | * caller must hold session s_mutex, dentry->d_lock | |
3131 | */ | |
3132 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
3133 | { | |
3134 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
3135 | ||
3136 | ceph_put_mds_session(di->lease_session); | |
3137 | di->lease_session = NULL; | |
3138 | } | |
3139 | ||
2600d2dd SW |
3140 | static void handle_lease(struct ceph_mds_client *mdsc, |
3141 | struct ceph_mds_session *session, | |
3142 | struct ceph_msg *msg) | |
2f2dc053 | 3143 | { |
3d14c5d2 | 3144 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 3145 | struct inode *inode; |
2f2dc053 SW |
3146 | struct dentry *parent, *dentry; |
3147 | struct ceph_dentry_info *di; | |
2600d2dd | 3148 | int mds = session->s_mds; |
2f2dc053 | 3149 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 3150 | u32 seq; |
2f2dc053 | 3151 | struct ceph_vino vino; |
2f2dc053 SW |
3152 | struct qstr dname; |
3153 | int release = 0; | |
3154 | ||
2f2dc053 SW |
3155 | dout("handle_lease from mds%d\n", mds); |
3156 | ||
3157 | /* decode */ | |
3158 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
3159 | goto bad; | |
3160 | vino.ino = le64_to_cpu(h->ino); | |
3161 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 3162 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
3163 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
3164 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
3165 | if (dname.len != get_unaligned_le32(h+1)) | |
3166 | goto bad; | |
3167 | ||
2f2dc053 SW |
3168 | /* lookup inode */ |
3169 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
3170 | dout("handle_lease %s, ino %llx %p %.*s\n", |
3171 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 3172 | dname.len, dname.name); |
6cd3bcad YZ |
3173 | |
3174 | mutex_lock(&session->s_mutex); | |
3175 | session->s_seq++; | |
3176 | ||
2f2dc053 SW |
3177 | if (inode == NULL) { |
3178 | dout("handle_lease no inode %llx\n", vino.ino); | |
3179 | goto release; | |
3180 | } | |
2f2dc053 SW |
3181 | |
3182 | /* dentry */ | |
3183 | parent = d_find_alias(inode); | |
3184 | if (!parent) { | |
3185 | dout("no parent dentry on inode %p\n", inode); | |
3186 | WARN_ON(1); | |
3187 | goto release; /* hrm... */ | |
3188 | } | |
8387ff25 | 3189 | dname.hash = full_name_hash(parent, dname.name, dname.len); |
2f2dc053 SW |
3190 | dentry = d_lookup(parent, &dname); |
3191 | dput(parent); | |
3192 | if (!dentry) | |
3193 | goto release; | |
3194 | ||
3195 | spin_lock(&dentry->d_lock); | |
3196 | di = ceph_dentry(dentry); | |
3197 | switch (h->action) { | |
3198 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 3199 | if (di->lease_session == session) { |
1e5ea23d SW |
3200 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
3201 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
3202 | __ceph_mdsc_drop_dentry_lease(dentry); |
3203 | } | |
3204 | release = 1; | |
3205 | break; | |
3206 | ||
3207 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 3208 | if (di->lease_session == session && |
2f2dc053 SW |
3209 | di->lease_gen == session->s_cap_gen && |
3210 | di->lease_renew_from && | |
3211 | di->lease_renew_after == 0) { | |
3212 | unsigned long duration = | |
3563dbdd | 3213 | msecs_to_jiffies(le32_to_cpu(h->duration_ms)); |
2f2dc053 | 3214 | |
1e5ea23d | 3215 | di->lease_seq = seq; |
9b16f03c | 3216 | di->time = di->lease_renew_from + duration; |
2f2dc053 SW |
3217 | di->lease_renew_after = di->lease_renew_from + |
3218 | (duration >> 1); | |
3219 | di->lease_renew_from = 0; | |
3220 | } | |
3221 | break; | |
3222 | } | |
3223 | spin_unlock(&dentry->d_lock); | |
3224 | dput(dentry); | |
3225 | ||
3226 | if (!release) | |
3227 | goto out; | |
3228 | ||
3229 | release: | |
3230 | /* let's just reuse the same message */ | |
3231 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
3232 | ceph_msg_get(msg); | |
3233 | ceph_con_send(&session->s_con, msg); | |
3234 | ||
3235 | out: | |
3236 | iput(inode); | |
3237 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
3238 | return; |
3239 | ||
3240 | bad: | |
3241 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 3242 | ceph_msg_dump(msg); |
2f2dc053 SW |
3243 | } |
3244 | ||
3245 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
3246 | struct inode *inode, | |
3247 | struct dentry *dentry, char action, | |
3248 | u32 seq) | |
3249 | { | |
3250 | struct ceph_msg *msg; | |
3251 | struct ceph_mds_lease *lease; | |
3252 | int len = sizeof(*lease) + sizeof(u32); | |
3253 | int dnamelen = 0; | |
3254 | ||
3255 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
3256 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
3257 | dnamelen = dentry->d_name.len; | |
3258 | len += dnamelen; | |
3259 | ||
b61c2763 | 3260 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 3261 | if (!msg) |
2f2dc053 SW |
3262 | return; |
3263 | lease = msg->front.iov_base; | |
3264 | lease->action = action; | |
2f2dc053 SW |
3265 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
3266 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
3267 | lease->seq = cpu_to_le32(seq); | |
3268 | put_unaligned_le32(dnamelen, lease + 1); | |
3269 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
3270 | ||
3271 | /* | |
3272 | * if this is a preemptive lease RELEASE, no need to | |
3273 | * flush request stream, since the actual request will | |
3274 | * soon follow. | |
3275 | */ | |
3276 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
3277 | ||
3278 | ceph_con_send(&session->s_con, msg); | |
3279 | } | |
3280 | ||
2f2dc053 SW |
3281 | /* |
3282 | * drop all leases (and dentry refs) in preparation for umount | |
3283 | */ | |
3284 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3285 | { | |
3286 | int i; | |
3287 | ||
3288 | dout("drop_leases\n"); | |
3289 | mutex_lock(&mdsc->mutex); | |
3290 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3291 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3292 | if (!s) | |
3293 | continue; | |
3294 | mutex_unlock(&mdsc->mutex); | |
3295 | mutex_lock(&s->s_mutex); | |
3296 | mutex_unlock(&s->s_mutex); | |
3297 | ceph_put_mds_session(s); | |
3298 | mutex_lock(&mdsc->mutex); | |
3299 | } | |
3300 | mutex_unlock(&mdsc->mutex); | |
3301 | } | |
3302 | ||
3303 | ||
3304 | ||
3305 | /* | |
3306 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3307 | */ | |
3308 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3309 | { | |
3310 | int delay = 5; | |
3311 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3312 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3313 | } | |
3314 | ||
3315 | static void delayed_work(struct work_struct *work) | |
3316 | { | |
3317 | int i; | |
3318 | struct ceph_mds_client *mdsc = | |
3319 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3320 | int renew_interval; | |
3321 | int renew_caps; | |
3322 | ||
3323 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3324 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3325 | |
3326 | mutex_lock(&mdsc->mutex); | |
3327 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3328 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3329 | mdsc->last_renew_caps); | |
3330 | if (renew_caps) | |
3331 | mdsc->last_renew_caps = jiffies; | |
3332 | ||
3333 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3334 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3335 | if (s == NULL) | |
3336 | continue; | |
3337 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3338 | dout("resending session close request for mds%d\n", | |
3339 | s->s_mds); | |
3340 | request_close_session(mdsc, s); | |
3341 | ceph_put_mds_session(s); | |
3342 | continue; | |
3343 | } | |
3344 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3345 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3346 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3347 | pr_info("mds%d hung\n", s->s_mds); | |
3348 | } | |
3349 | } | |
3350 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3351 | /* this mds is failed or recovering, just wait */ | |
3352 | ceph_put_mds_session(s); | |
3353 | continue; | |
3354 | } | |
3355 | mutex_unlock(&mdsc->mutex); | |
3356 | ||
3357 | mutex_lock(&s->s_mutex); | |
3358 | if (renew_caps) | |
3359 | send_renew_caps(mdsc, s); | |
3360 | else | |
3361 | ceph_con_keepalive(&s->s_con); | |
aab53dd9 SW |
3362 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3363 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3364 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3365 | mutex_unlock(&s->s_mutex); |
3366 | ceph_put_mds_session(s); | |
3367 | ||
3368 | mutex_lock(&mdsc->mutex); | |
3369 | } | |
3370 | mutex_unlock(&mdsc->mutex); | |
3371 | ||
3372 | schedule_delayed(mdsc); | |
3373 | } | |
3374 | ||
3d14c5d2 | 3375 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3376 | |
2f2dc053 | 3377 | { |
3d14c5d2 YS |
3378 | struct ceph_mds_client *mdsc; |
3379 | ||
3380 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3381 | if (!mdsc) | |
3382 | return -ENOMEM; | |
3383 | mdsc->fsc = fsc; | |
3384 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3385 | mutex_init(&mdsc->mutex); |
3386 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
fb3101b6 | 3387 | if (mdsc->mdsmap == NULL) { |
3388 | kfree(mdsc); | |
2d06eeb8 | 3389 | return -ENOMEM; |
fb3101b6 | 3390 | } |
2d06eeb8 | 3391 | |
2f2dc053 | 3392 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3393 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3394 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3395 | mdsc->sessions = NULL; | |
86d8f67b | 3396 | atomic_set(&mdsc->num_sessions, 0); |
2f2dc053 SW |
3397 | mdsc->max_sessions = 0; |
3398 | mdsc->stopping = 0; | |
affbc19a | 3399 | mdsc->last_snap_seq = 0; |
2f2dc053 | 3400 | init_rwsem(&mdsc->snap_rwsem); |
a105f00c | 3401 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3402 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3403 | spin_lock_init(&mdsc->snap_empty_lock); | |
3404 | mdsc->last_tid = 0; | |
e8a7b8b1 | 3405 | mdsc->oldest_tid = 0; |
44ca18f2 | 3406 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3407 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3408 | mdsc->last_renew_caps = jiffies; | |
3409 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3410 | spin_lock_init(&mdsc->cap_delay_lock); | |
3411 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3412 | spin_lock_init(&mdsc->snap_flush_lock); | |
553adfd9 | 3413 | mdsc->last_cap_flush_tid = 1; |
e4500b5e | 3414 | INIT_LIST_HEAD(&mdsc->cap_flush_list); |
2f2dc053 | 3415 | INIT_LIST_HEAD(&mdsc->cap_dirty); |
db354052 | 3416 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3417 | mdsc->num_cap_flushing = 0; |
3418 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3419 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3420 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3421 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3422 | |
37151668 | 3423 | ceph_caps_init(mdsc); |
3d14c5d2 | 3424 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3425 | |
10183a69 YZ |
3426 | init_rwsem(&mdsc->pool_perm_rwsem); |
3427 | mdsc->pool_perm_tree = RB_ROOT; | |
3428 | ||
5f44f142 | 3429 | return 0; |
2f2dc053 SW |
3430 | } |
3431 | ||
3432 | /* | |
3433 | * Wait for safe replies on open mds requests. If we time out, drop | |
3434 | * all requests from the tree to avoid dangling dentry refs. | |
3435 | */ | |
3436 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3437 | { | |
a319bf56 | 3438 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 | 3439 | struct ceph_mds_request *req; |
2f2dc053 SW |
3440 | |
3441 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3442 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3443 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3444 | |
2f2dc053 SW |
3445 | dout("wait_requests waiting for requests\n"); |
3446 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
a319bf56 | 3447 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
3448 | |
3449 | /* tear down remaining requests */ | |
44ca18f2 SW |
3450 | mutex_lock(&mdsc->mutex); |
3451 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3452 | dout("wait_requests timed out on tid %llu\n", |
3453 | req->r_tid); | |
44ca18f2 | 3454 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3455 | } |
3456 | } | |
3457 | mutex_unlock(&mdsc->mutex); | |
3458 | dout("wait_requests done\n"); | |
3459 | } | |
3460 | ||
3461 | /* | |
3462 | * called before mount is ro, and before dentries are torn down. | |
3463 | * (hmm, does this still race with new lookups?) | |
3464 | */ | |
3465 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3466 | { | |
3467 | dout("pre_umount\n"); | |
3468 | mdsc->stopping = 1; | |
3469 | ||
3470 | drop_leases(mdsc); | |
afcdaea3 | 3471 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3472 | wait_requests(mdsc); |
17c688c3 SW |
3473 | |
3474 | /* | |
3475 | * wait for reply handlers to drop their request refs and | |
3476 | * their inode/dcache refs | |
3477 | */ | |
3478 | ceph_msgr_flush(); | |
2f2dc053 SW |
3479 | } |
3480 | ||
3481 | /* | |
3482 | * wait for all write mds requests to flush. | |
3483 | */ | |
3484 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3485 | { | |
80fc7314 | 3486 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3487 | struct rb_node *n; |
2f2dc053 SW |
3488 | |
3489 | mutex_lock(&mdsc->mutex); | |
3490 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3491 | restart: |
44ca18f2 SW |
3492 | req = __get_oldest_req(mdsc); |
3493 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3494 | /* find next request */ |
3495 | n = rb_next(&req->r_node); | |
3496 | if (n) | |
3497 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3498 | else | |
3499 | nextreq = NULL; | |
e8a7b8b1 YZ |
3500 | if (req->r_op != CEPH_MDS_OP_SETFILELOCK && |
3501 | (req->r_op & CEPH_MDS_OP_WRITE)) { | |
44ca18f2 SW |
3502 | /* write op */ |
3503 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3504 | if (nextreq) |
3505 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3506 | mutex_unlock(&mdsc->mutex); |
3507 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3508 | req->r_tid, want_tid); | |
3509 | wait_for_completion(&req->r_safe_completion); | |
3510 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3511 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3512 | if (!nextreq) |
3513 | break; /* next dne before, so we're done! */ | |
3514 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3515 | /* next request was removed from tree */ | |
3516 | ceph_mdsc_put_request(nextreq); | |
3517 | goto restart; | |
3518 | } | |
3519 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3520 | } |
80fc7314 | 3521 | req = nextreq; |
2f2dc053 SW |
3522 | } |
3523 | mutex_unlock(&mdsc->mutex); | |
3524 | dout("wait_unsafe_requests done\n"); | |
3525 | } | |
3526 | ||
3527 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3528 | { | |
0e294387 | 3529 | u64 want_tid, want_flush; |
2f2dc053 | 3530 | |
48fec5d0 | 3531 | if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3532 | return; |
3533 | ||
2f2dc053 SW |
3534 | dout("sync\n"); |
3535 | mutex_lock(&mdsc->mutex); | |
3536 | want_tid = mdsc->last_tid; | |
2f2dc053 | 3537 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 3538 | |
afcdaea3 | 3539 | ceph_flush_dirty_caps(mdsc); |
d3383a8e | 3540 | spin_lock(&mdsc->cap_dirty_lock); |
8310b089 | 3541 | want_flush = mdsc->last_cap_flush_tid; |
c8799fc4 YZ |
3542 | if (!list_empty(&mdsc->cap_flush_list)) { |
3543 | struct ceph_cap_flush *cf = | |
3544 | list_last_entry(&mdsc->cap_flush_list, | |
3545 | struct ceph_cap_flush, g_list); | |
3546 | cf->wake = true; | |
3547 | } | |
d3383a8e YZ |
3548 | spin_unlock(&mdsc->cap_dirty_lock); |
3549 | ||
0e294387 YZ |
3550 | dout("sync want tid %lld flush_seq %lld\n", |
3551 | want_tid, want_flush); | |
2f2dc053 SW |
3552 | |
3553 | wait_unsafe_requests(mdsc, want_tid); | |
0e294387 | 3554 | wait_caps_flush(mdsc, want_flush); |
2f2dc053 SW |
3555 | } |
3556 | ||
f3c60c59 SW |
3557 | /* |
3558 | * true if all sessions are closed, or we force unmount | |
3559 | */ | |
7fd7d101 | 3560 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
f3c60c59 | 3561 | { |
48fec5d0 | 3562 | if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 | 3563 | return true; |
86d8f67b | 3564 | return atomic_read(&mdsc->num_sessions) == 0; |
f3c60c59 | 3565 | } |
2f2dc053 SW |
3566 | |
3567 | /* | |
3568 | * called after sb is ro. | |
3569 | */ | |
3570 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3571 | { | |
a319bf56 | 3572 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 SW |
3573 | struct ceph_mds_session *session; |
3574 | int i; | |
2f2dc053 SW |
3575 | |
3576 | dout("close_sessions\n"); | |
3577 | ||
2f2dc053 | 3578 | /* close sessions */ |
f3c60c59 SW |
3579 | mutex_lock(&mdsc->mutex); |
3580 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3581 | session = __ceph_lookup_mds_session(mdsc, i); | |
3582 | if (!session) | |
3583 | continue; | |
2f2dc053 | 3584 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3585 | mutex_lock(&session->s_mutex); |
3586 | __close_session(mdsc, session); | |
3587 | mutex_unlock(&session->s_mutex); | |
3588 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3589 | mutex_lock(&mdsc->mutex); |
3590 | } | |
f3c60c59 SW |
3591 | mutex_unlock(&mdsc->mutex); |
3592 | ||
3593 | dout("waiting for sessions to close\n"); | |
3594 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
a319bf56 | 3595 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
3596 | |
3597 | /* tear down remaining sessions */ | |
f3c60c59 | 3598 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3599 | for (i = 0; i < mdsc->max_sessions; i++) { |
3600 | if (mdsc->sessions[i]) { | |
3601 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3602 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3603 | mutex_unlock(&mdsc->mutex); |
3604 | mutex_lock(&session->s_mutex); | |
3605 | remove_session_caps(session); | |
3606 | mutex_unlock(&session->s_mutex); | |
3607 | ceph_put_mds_session(session); | |
3608 | mutex_lock(&mdsc->mutex); | |
3609 | } | |
3610 | } | |
2f2dc053 | 3611 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3612 | mutex_unlock(&mdsc->mutex); |
3613 | ||
3614 | ceph_cleanup_empty_realms(mdsc); | |
3615 | ||
3616 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3617 | ||
3618 | dout("stopped\n"); | |
3619 | } | |
3620 | ||
48fec5d0 YZ |
3621 | void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) |
3622 | { | |
3623 | struct ceph_mds_session *session; | |
3624 | int mds; | |
3625 | ||
3626 | dout("force umount\n"); | |
3627 | ||
3628 | mutex_lock(&mdsc->mutex); | |
3629 | for (mds = 0; mds < mdsc->max_sessions; mds++) { | |
3630 | session = __ceph_lookup_mds_session(mdsc, mds); | |
3631 | if (!session) | |
3632 | continue; | |
3633 | mutex_unlock(&mdsc->mutex); | |
3634 | mutex_lock(&session->s_mutex); | |
3635 | __close_session(mdsc, session); | |
3636 | if (session->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3637 | cleanup_session_requests(mdsc, session); | |
3638 | remove_session_caps(session); | |
3639 | } | |
3640 | mutex_unlock(&session->s_mutex); | |
3641 | ceph_put_mds_session(session); | |
3642 | mutex_lock(&mdsc->mutex); | |
3643 | kick_requests(mdsc, mds); | |
3644 | } | |
3645 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3646 | mutex_unlock(&mdsc->mutex); | |
3647 | } | |
3648 | ||
3d14c5d2 | 3649 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3650 | { |
3651 | dout("stop\n"); | |
3652 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3653 | if (mdsc->mdsmap) | |
3654 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3655 | kfree(mdsc->sessions); | |
37151668 | 3656 | ceph_caps_finalize(mdsc); |
10183a69 | 3657 | ceph_pool_perm_destroy(mdsc); |
2f2dc053 SW |
3658 | } |
3659 | ||
3d14c5d2 YS |
3660 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3661 | { | |
3662 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3663 | ||
ef550f6f | 3664 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3665 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3666 | |
3667 | /* flush out any connection work with references to us */ | |
3668 | ceph_msgr_flush(); | |
3669 | ||
3d14c5d2 YS |
3670 | fsc->mdsc = NULL; |
3671 | kfree(mdsc); | |
ef550f6f | 3672 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3673 | } |
3674 | ||
430afbad YZ |
3675 | void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
3676 | { | |
3677 | struct ceph_fs_client *fsc = mdsc->fsc; | |
3678 | const char *mds_namespace = fsc->mount_options->mds_namespace; | |
3679 | void *p = msg->front.iov_base; | |
3680 | void *end = p + msg->front.iov_len; | |
3681 | u32 epoch; | |
3682 | u32 map_len; | |
3683 | u32 num_fs; | |
3684 | u32 mount_fscid = (u32)-1; | |
3685 | u8 struct_v, struct_cv; | |
3686 | int err = -EINVAL; | |
3687 | ||
3688 | ceph_decode_need(&p, end, sizeof(u32), bad); | |
3689 | epoch = ceph_decode_32(&p); | |
3690 | ||
3691 | dout("handle_fsmap epoch %u\n", epoch); | |
3692 | ||
3693 | ceph_decode_need(&p, end, 2 + sizeof(u32), bad); | |
3694 | struct_v = ceph_decode_8(&p); | |
3695 | struct_cv = ceph_decode_8(&p); | |
3696 | map_len = ceph_decode_32(&p); | |
3697 | ||
3698 | ceph_decode_need(&p, end, sizeof(u32) * 3, bad); | |
3699 | p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */ | |
3700 | ||
3701 | num_fs = ceph_decode_32(&p); | |
3702 | while (num_fs-- > 0) { | |
3703 | void *info_p, *info_end; | |
3704 | u32 info_len; | |
3705 | u8 info_v, info_cv; | |
3706 | u32 fscid, namelen; | |
3707 | ||
3708 | ceph_decode_need(&p, end, 2 + sizeof(u32), bad); | |
3709 | info_v = ceph_decode_8(&p); | |
3710 | info_cv = ceph_decode_8(&p); | |
3711 | info_len = ceph_decode_32(&p); | |
3712 | ceph_decode_need(&p, end, info_len, bad); | |
3713 | info_p = p; | |
3714 | info_end = p + info_len; | |
3715 | p = info_end; | |
3716 | ||
3717 | ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad); | |
3718 | fscid = ceph_decode_32(&info_p); | |
3719 | namelen = ceph_decode_32(&info_p); | |
3720 | ceph_decode_need(&info_p, info_end, namelen, bad); | |
3721 | ||
3722 | if (mds_namespace && | |
3723 | strlen(mds_namespace) == namelen && | |
3724 | !strncmp(mds_namespace, (char *)info_p, namelen)) { | |
3725 | mount_fscid = fscid; | |
3726 | break; | |
3727 | } | |
3728 | } | |
3729 | ||
3730 | ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch); | |
3731 | if (mount_fscid != (u32)-1) { | |
3732 | fsc->client->monc.fs_cluster_id = mount_fscid; | |
3733 | ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, | |
3734 | 0, true); | |
3735 | ceph_monc_renew_subs(&fsc->client->monc); | |
3736 | } else { | |
3737 | err = -ENOENT; | |
3738 | goto err_out; | |
3739 | } | |
3740 | return; | |
3741 | bad: | |
3742 | pr_err("error decoding fsmap\n"); | |
3743 | err_out: | |
3744 | mutex_lock(&mdsc->mutex); | |
3745 | mdsc->mdsmap_err = -ENOENT; | |
3746 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3747 | mutex_unlock(&mdsc->mutex); | |
3748 | return; | |
3749 | } | |
2f2dc053 SW |
3750 | |
3751 | /* | |
3752 | * handle mds map update. | |
3753 | */ | |
430afbad | 3754 | void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
2f2dc053 SW |
3755 | { |
3756 | u32 epoch; | |
3757 | u32 maplen; | |
3758 | void *p = msg->front.iov_base; | |
3759 | void *end = p + msg->front.iov_len; | |
3760 | struct ceph_mdsmap *newmap, *oldmap; | |
3761 | struct ceph_fsid fsid; | |
3762 | int err = -EINVAL; | |
3763 | ||
3764 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3765 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3766 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3767 | return; |
c89136ea SW |
3768 | epoch = ceph_decode_32(&p); |
3769 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3770 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3771 | ||
3772 | /* do we need it? */ | |
2f2dc053 SW |
3773 | mutex_lock(&mdsc->mutex); |
3774 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3775 | dout("handle_map epoch %u <= our %u\n", | |
3776 | epoch, mdsc->mdsmap->m_epoch); | |
3777 | mutex_unlock(&mdsc->mutex); | |
3778 | return; | |
3779 | } | |
3780 | ||
3781 | newmap = ceph_mdsmap_decode(&p, end); | |
3782 | if (IS_ERR(newmap)) { | |
3783 | err = PTR_ERR(newmap); | |
3784 | goto bad_unlock; | |
3785 | } | |
3786 | ||
3787 | /* swap into place */ | |
3788 | if (mdsc->mdsmap) { | |
3789 | oldmap = mdsc->mdsmap; | |
3790 | mdsc->mdsmap = newmap; | |
3791 | check_new_map(mdsc, newmap, oldmap); | |
3792 | ceph_mdsmap_destroy(oldmap); | |
3793 | } else { | |
3794 | mdsc->mdsmap = newmap; /* first mds map */ | |
3795 | } | |
3d14c5d2 | 3796 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3797 | |
3798 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
82dcabad ID |
3799 | ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, |
3800 | mdsc->mdsmap->m_epoch); | |
2f2dc053 SW |
3801 | |
3802 | mutex_unlock(&mdsc->mutex); | |
3803 | schedule_delayed(mdsc); | |
3804 | return; | |
3805 | ||
3806 | bad_unlock: | |
3807 | mutex_unlock(&mdsc->mutex); | |
3808 | bad: | |
3809 | pr_err("error decoding mdsmap %d\n", err); | |
3810 | return; | |
3811 | } | |
3812 | ||
3813 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3814 | { | |
3815 | struct ceph_mds_session *s = con->private; | |
3816 | ||
3817 | if (get_session(s)) { | |
2600d2dd | 3818 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3819 | return con; |
3820 | } | |
3821 | dout("mdsc con_get %p FAIL\n", s); | |
3822 | return NULL; | |
3823 | } | |
3824 | ||
3825 | static void con_put(struct ceph_connection *con) | |
3826 | { | |
3827 | struct ceph_mds_session *s = con->private; | |
3828 | ||
7d8e18a6 | 3829 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3830 | ceph_put_mds_session(s); |
3831 | } | |
3832 | ||
3833 | /* | |
3834 | * if the client is unresponsive for long enough, the mds will kill | |
3835 | * the session entirely. | |
3836 | */ | |
3837 | static void peer_reset(struct ceph_connection *con) | |
3838 | { | |
3839 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3840 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3841 | |
f3ae1b97 | 3842 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 3843 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
3844 | } |
3845 | ||
3846 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3847 | { | |
3848 | struct ceph_mds_session *s = con->private; | |
3849 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3850 | int type = le16_to_cpu(msg->hdr.type); | |
3851 | ||
2600d2dd SW |
3852 | mutex_lock(&mdsc->mutex); |
3853 | if (__verify_registered_session(mdsc, s) < 0) { | |
3854 | mutex_unlock(&mdsc->mutex); | |
3855 | goto out; | |
3856 | } | |
3857 | mutex_unlock(&mdsc->mutex); | |
3858 | ||
2f2dc053 SW |
3859 | switch (type) { |
3860 | case CEPH_MSG_MDS_MAP: | |
430afbad YZ |
3861 | ceph_mdsc_handle_mdsmap(mdsc, msg); |
3862 | break; | |
3863 | case CEPH_MSG_FS_MAP_USER: | |
3864 | ceph_mdsc_handle_fsmap(mdsc, msg); | |
2f2dc053 SW |
3865 | break; |
3866 | case CEPH_MSG_CLIENT_SESSION: | |
3867 | handle_session(s, msg); | |
3868 | break; | |
3869 | case CEPH_MSG_CLIENT_REPLY: | |
3870 | handle_reply(s, msg); | |
3871 | break; | |
3872 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3873 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3874 | break; |
3875 | case CEPH_MSG_CLIENT_CAPS: | |
3876 | ceph_handle_caps(s, msg); | |
3877 | break; | |
3878 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3879 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3880 | break; |
3881 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3882 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3883 | break; |
3884 | ||
3885 | default: | |
3886 | pr_err("received unknown message type %d %s\n", type, | |
3887 | ceph_msg_type_name(type)); | |
3888 | } | |
2600d2dd | 3889 | out: |
2f2dc053 SW |
3890 | ceph_msg_put(msg); |
3891 | } | |
3892 | ||
4e7a5dcd SW |
3893 | /* |
3894 | * authentication | |
3895 | */ | |
a3530df3 AE |
3896 | |
3897 | /* | |
3898 | * Note: returned pointer is the address of a structure that's | |
3899 | * managed separately. Caller must *not* attempt to free it. | |
3900 | */ | |
3901 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 3902 | int *proto, int force_new) |
4e7a5dcd SW |
3903 | { |
3904 | struct ceph_mds_session *s = con->private; | |
3905 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3906 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 3907 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 3908 | |
74f1869f | 3909 | if (force_new && auth->authorizer) { |
6c1ea260 | 3910 | ceph_auth_destroy_authorizer(auth->authorizer); |
74f1869f | 3911 | auth->authorizer = NULL; |
4e7a5dcd | 3912 | } |
27859f97 SW |
3913 | if (!auth->authorizer) { |
3914 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3915 | auth); | |
0bed9b5c SW |
3916 | if (ret) |
3917 | return ERR_PTR(ret); | |
27859f97 SW |
3918 | } else { |
3919 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3920 | auth); | |
a255651d | 3921 | if (ret) |
a3530df3 | 3922 | return ERR_PTR(ret); |
4e7a5dcd | 3923 | } |
4e7a5dcd | 3924 | *proto = ac->protocol; |
74f1869f | 3925 | |
a3530df3 | 3926 | return auth; |
4e7a5dcd SW |
3927 | } |
3928 | ||
3929 | ||
3930 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3931 | { | |
3932 | struct ceph_mds_session *s = con->private; | |
3933 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3934 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 3935 | |
27859f97 | 3936 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); |
4e7a5dcd SW |
3937 | } |
3938 | ||
9bd2e6f8 SW |
3939 | static int invalidate_authorizer(struct ceph_connection *con) |
3940 | { | |
3941 | struct ceph_mds_session *s = con->private; | |
3942 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3943 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 3944 | |
27859f97 | 3945 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 3946 | |
3d14c5d2 | 3947 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3948 | } |
3949 | ||
53ded495 AE |
3950 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
3951 | struct ceph_msg_header *hdr, int *skip) | |
3952 | { | |
3953 | struct ceph_msg *msg; | |
3954 | int type = (int) le16_to_cpu(hdr->type); | |
3955 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
3956 | ||
3957 | if (con->in_msg) | |
3958 | return con->in_msg; | |
3959 | ||
3960 | *skip = 0; | |
3961 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
3962 | if (!msg) { | |
3963 | pr_err("unable to allocate msg type %d len %d\n", | |
3964 | type, front_len); | |
3965 | return NULL; | |
3966 | } | |
53ded495 AE |
3967 | |
3968 | return msg; | |
3969 | } | |
3970 | ||
79dbd1ba | 3971 | static int mds_sign_message(struct ceph_msg *msg) |
33d07337 | 3972 | { |
79dbd1ba | 3973 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 3974 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 3975 | |
33d07337 YZ |
3976 | return ceph_auth_sign_message(auth, msg); |
3977 | } | |
3978 | ||
79dbd1ba | 3979 | static int mds_check_message_signature(struct ceph_msg *msg) |
33d07337 | 3980 | { |
79dbd1ba | 3981 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 3982 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 3983 | |
33d07337 YZ |
3984 | return ceph_auth_check_message_signature(auth, msg); |
3985 | } | |
3986 | ||
9e32789f | 3987 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3988 | .get = con_get, |
3989 | .put = con_put, | |
3990 | .dispatch = dispatch, | |
4e7a5dcd SW |
3991 | .get_authorizer = get_authorizer, |
3992 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3993 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3994 | .peer_reset = peer_reset, |
53ded495 | 3995 | .alloc_msg = mds_alloc_msg, |
79dbd1ba ID |
3996 | .sign_message = mds_sign_message, |
3997 | .check_message_signature = mds_check_message_signature, | |
2f2dc053 SW |
3998 | }; |
3999 | ||
2f2dc053 | 4000 | /* eof */ |