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> |
2f2dc053 | 11 | |
2f2dc053 | 12 | #include "super.h" |
3d14c5d2 YS |
13 | #include "mds_client.h" |
14 | ||
1fe60e51 | 15 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
16 | #include <linux/ceph/messenger.h> |
17 | #include <linux/ceph/decode.h> | |
18 | #include <linux/ceph/pagelist.h> | |
19 | #include <linux/ceph/auth.h> | |
20 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
21 | |
22 | /* | |
23 | * A cluster of MDS (metadata server) daemons is responsible for | |
24 | * managing the file system namespace (the directory hierarchy and | |
25 | * inodes) and for coordinating shared access to storage. Metadata is | |
26 | * partitioning hierarchically across a number of servers, and that | |
27 | * partition varies over time as the cluster adjusts the distribution | |
28 | * in order to balance load. | |
29 | * | |
30 | * The MDS client is primarily responsible to managing synchronous | |
31 | * metadata requests for operations like open, unlink, and so forth. | |
32 | * If there is a MDS failure, we find out about it when we (possibly | |
33 | * request and) receive a new MDS map, and can resubmit affected | |
34 | * requests. | |
35 | * | |
36 | * For the most part, though, we take advantage of a lossless | |
37 | * communications channel to the MDS, and do not need to worry about | |
38 | * timing out or resubmitting requests. | |
39 | * | |
40 | * We maintain a stateful "session" with each MDS we interact with. | |
41 | * Within each session, we sent periodic heartbeat messages to ensure | |
42 | * any capabilities or leases we have been issues remain valid. If | |
43 | * the session times out and goes stale, our leases and capabilities | |
44 | * are no longer valid. | |
45 | */ | |
46 | ||
20cb34ae | 47 | struct ceph_reconnect_state { |
44c99757 | 48 | int nr_caps; |
20cb34ae SW |
49 | struct ceph_pagelist *pagelist; |
50 | bool flock; | |
51 | }; | |
52 | ||
2f2dc053 SW |
53 | static void __wake_requests(struct ceph_mds_client *mdsc, |
54 | struct list_head *head); | |
55 | ||
9e32789f | 56 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
57 | |
58 | ||
59 | /* | |
60 | * mds reply parsing | |
61 | */ | |
62 | ||
63 | /* | |
64 | * parse individual inode info | |
65 | */ | |
66 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 67 | struct ceph_mds_reply_info_in *info, |
12b4629a | 68 | u64 features) |
2f2dc053 SW |
69 | { |
70 | int err = -EIO; | |
71 | ||
72 | info->in = *p; | |
73 | *p += sizeof(struct ceph_mds_reply_inode) + | |
74 | sizeof(*info->in->fragtree.splits) * | |
75 | le32_to_cpu(info->in->fragtree.nsplits); | |
76 | ||
77 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
78 | ceph_decode_need(p, end, info->symlink_len, bad); | |
79 | info->symlink = *p; | |
80 | *p += info->symlink_len; | |
81 | ||
14303d20 SW |
82 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
83 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
84 | sizeof(info->dir_layout), bad); | |
85 | else | |
86 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
87 | ||
2f2dc053 SW |
88 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
89 | ceph_decode_need(p, end, info->xattr_len, bad); | |
90 | info->xattr_data = *p; | |
91 | *p += info->xattr_len; | |
fb01d1f8 YZ |
92 | |
93 | if (features & CEPH_FEATURE_MDS_INLINE_DATA) { | |
94 | ceph_decode_64_safe(p, end, info->inline_version, bad); | |
95 | ceph_decode_32_safe(p, end, info->inline_len, bad); | |
96 | ceph_decode_need(p, end, info->inline_len, bad); | |
97 | info->inline_data = *p; | |
98 | *p += info->inline_len; | |
99 | } else | |
100 | info->inline_version = CEPH_INLINE_NONE; | |
101 | ||
2f2dc053 SW |
102 | return 0; |
103 | bad: | |
104 | return err; | |
105 | } | |
106 | ||
107 | /* | |
108 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
109 | * target inode. | |
110 | */ | |
111 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 112 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 113 | u64 features) |
2f2dc053 SW |
114 | { |
115 | int err; | |
116 | ||
117 | if (info->head->is_dentry) { | |
14303d20 | 118 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
119 | if (err < 0) |
120 | goto out_bad; | |
121 | ||
122 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
123 | goto bad; | |
124 | info->dirfrag = *p; | |
125 | *p += sizeof(*info->dirfrag) + | |
126 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
127 | if (unlikely(*p > end)) | |
128 | goto bad; | |
129 | ||
130 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
131 | ceph_decode_need(p, end, info->dname_len, bad); | |
132 | info->dname = *p; | |
133 | *p += info->dname_len; | |
134 | info->dlease = *p; | |
135 | *p += sizeof(*info->dlease); | |
136 | } | |
137 | ||
138 | if (info->head->is_target) { | |
14303d20 | 139 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
140 | if (err < 0) |
141 | goto out_bad; | |
142 | } | |
143 | ||
144 | if (unlikely(*p != end)) | |
145 | goto bad; | |
146 | return 0; | |
147 | ||
148 | bad: | |
149 | err = -EIO; | |
150 | out_bad: | |
151 | pr_err("problem parsing mds trace %d\n", err); | |
152 | return err; | |
153 | } | |
154 | ||
155 | /* | |
156 | * parse readdir results | |
157 | */ | |
158 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 159 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 160 | u64 features) |
2f2dc053 SW |
161 | { |
162 | u32 num, i = 0; | |
163 | int err; | |
164 | ||
165 | info->dir_dir = *p; | |
166 | if (*p + sizeof(*info->dir_dir) > end) | |
167 | goto bad; | |
168 | *p += sizeof(*info->dir_dir) + | |
169 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
170 | if (*p > end) | |
171 | goto bad; | |
172 | ||
173 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea SW |
174 | num = ceph_decode_32(p); |
175 | info->dir_end = ceph_decode_8(p); | |
176 | info->dir_complete = ceph_decode_8(p); | |
2f2dc053 SW |
177 | if (num == 0) |
178 | goto done; | |
179 | ||
54008399 | 180 | BUG_ON(!info->dir_in); |
2f2dc053 SW |
181 | info->dir_dname = (void *)(info->dir_in + num); |
182 | info->dir_dname_len = (void *)(info->dir_dname + num); | |
183 | info->dir_dlease = (void *)(info->dir_dname_len + num); | |
54008399 YZ |
184 | if ((unsigned long)(info->dir_dlease + num) > |
185 | (unsigned long)info->dir_in + info->dir_buf_size) { | |
186 | pr_err("dir contents are larger than expected\n"); | |
187 | WARN_ON(1); | |
188 | goto bad; | |
189 | } | |
2f2dc053 | 190 | |
54008399 | 191 | info->dir_nr = num; |
2f2dc053 SW |
192 | while (num) { |
193 | /* dentry */ | |
194 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
c89136ea | 195 | info->dir_dname_len[i] = ceph_decode_32(p); |
2f2dc053 SW |
196 | ceph_decode_need(p, end, info->dir_dname_len[i], bad); |
197 | info->dir_dname[i] = *p; | |
198 | *p += info->dir_dname_len[i]; | |
199 | dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i], | |
200 | info->dir_dname[i]); | |
201 | info->dir_dlease[i] = *p; | |
202 | *p += sizeof(struct ceph_mds_reply_lease); | |
203 | ||
204 | /* inode */ | |
14303d20 | 205 | err = parse_reply_info_in(p, end, &info->dir_in[i], features); |
2f2dc053 SW |
206 | if (err < 0) |
207 | goto out_bad; | |
208 | i++; | |
209 | num--; | |
210 | } | |
211 | ||
212 | done: | |
213 | if (*p != end) | |
214 | goto bad; | |
215 | return 0; | |
216 | ||
217 | bad: | |
218 | err = -EIO; | |
219 | out_bad: | |
220 | pr_err("problem parsing dir contents %d\n", err); | |
221 | return err; | |
222 | } | |
223 | ||
25933abd HS |
224 | /* |
225 | * parse fcntl F_GETLK results | |
226 | */ | |
227 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 228 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 229 | u64 features) |
25933abd HS |
230 | { |
231 | if (*p + sizeof(*info->filelock_reply) > end) | |
232 | goto bad; | |
233 | ||
234 | info->filelock_reply = *p; | |
235 | *p += sizeof(*info->filelock_reply); | |
236 | ||
237 | if (unlikely(*p != end)) | |
238 | goto bad; | |
239 | return 0; | |
240 | ||
241 | bad: | |
242 | return -EIO; | |
243 | } | |
244 | ||
6e8575fa SL |
245 | /* |
246 | * parse create results | |
247 | */ | |
248 | static int parse_reply_info_create(void **p, void *end, | |
249 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 250 | u64 features) |
6e8575fa SL |
251 | { |
252 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
253 | if (*p == end) { | |
254 | info->has_create_ino = false; | |
255 | } else { | |
256 | info->has_create_ino = true; | |
257 | info->ino = ceph_decode_64(p); | |
258 | } | |
259 | } | |
260 | ||
261 | if (unlikely(*p != end)) | |
262 | goto bad; | |
263 | return 0; | |
264 | ||
265 | bad: | |
266 | return -EIO; | |
267 | } | |
268 | ||
25933abd HS |
269 | /* |
270 | * parse extra results | |
271 | */ | |
272 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 273 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 274 | u64 features) |
25933abd HS |
275 | { |
276 | if (info->head->op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 277 | return parse_reply_info_filelock(p, end, info, features); |
8a034497 YZ |
278 | else if (info->head->op == CEPH_MDS_OP_READDIR || |
279 | info->head->op == CEPH_MDS_OP_LSSNAP) | |
14303d20 | 280 | return parse_reply_info_dir(p, end, info, features); |
6e8575fa SL |
281 | else if (info->head->op == CEPH_MDS_OP_CREATE) |
282 | return parse_reply_info_create(p, end, info, features); | |
283 | else | |
284 | return -EIO; | |
25933abd HS |
285 | } |
286 | ||
2f2dc053 SW |
287 | /* |
288 | * parse entire mds reply | |
289 | */ | |
290 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 291 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 292 | u64 features) |
2f2dc053 SW |
293 | { |
294 | void *p, *end; | |
295 | u32 len; | |
296 | int err; | |
297 | ||
298 | info->head = msg->front.iov_base; | |
299 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
300 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
301 | ||
302 | /* trace */ | |
303 | ceph_decode_32_safe(&p, end, len, bad); | |
304 | if (len > 0) { | |
32852a81 | 305 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 306 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
307 | if (err < 0) |
308 | goto out_bad; | |
309 | } | |
310 | ||
25933abd | 311 | /* extra */ |
2f2dc053 SW |
312 | ceph_decode_32_safe(&p, end, len, bad); |
313 | if (len > 0) { | |
32852a81 | 314 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 315 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
316 | if (err < 0) |
317 | goto out_bad; | |
318 | } | |
319 | ||
320 | /* snap blob */ | |
321 | ceph_decode_32_safe(&p, end, len, bad); | |
322 | info->snapblob_len = len; | |
323 | info->snapblob = p; | |
324 | p += len; | |
325 | ||
326 | if (p != end) | |
327 | goto bad; | |
328 | return 0; | |
329 | ||
330 | bad: | |
331 | err = -EIO; | |
332 | out_bad: | |
333 | pr_err("mds parse_reply err %d\n", err); | |
334 | return err; | |
335 | } | |
336 | ||
337 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
338 | { | |
54008399 YZ |
339 | if (!info->dir_in) |
340 | return; | |
341 | free_pages((unsigned long)info->dir_in, get_order(info->dir_buf_size)); | |
2f2dc053 SW |
342 | } |
343 | ||
344 | ||
345 | /* | |
346 | * sessions | |
347 | */ | |
a687ecaf | 348 | const char *ceph_session_state_name(int s) |
2f2dc053 SW |
349 | { |
350 | switch (s) { | |
351 | case CEPH_MDS_SESSION_NEW: return "new"; | |
352 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
353 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
354 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
355 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 356 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 SW |
357 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
358 | default: return "???"; | |
359 | } | |
360 | } | |
361 | ||
362 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
363 | { | |
364 | if (atomic_inc_not_zero(&s->s_ref)) { | |
365 | dout("mdsc get_session %p %d -> %d\n", s, | |
366 | atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref)); | |
367 | return s; | |
368 | } else { | |
369 | dout("mdsc get_session %p 0 -- FAIL", s); | |
370 | return NULL; | |
371 | } | |
372 | } | |
373 | ||
374 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
375 | { | |
376 | dout("mdsc put_session %p %d -> %d\n", s, | |
377 | atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1); | |
4e7a5dcd | 378 | if (atomic_dec_and_test(&s->s_ref)) { |
6c4a1915 | 379 | if (s->s_auth.authorizer) |
27859f97 SW |
380 | ceph_auth_destroy_authorizer( |
381 | s->s_mdsc->fsc->client->monc.auth, | |
382 | s->s_auth.authorizer); | |
2f2dc053 | 383 | kfree(s); |
4e7a5dcd | 384 | } |
2f2dc053 SW |
385 | } |
386 | ||
387 | /* | |
388 | * called under mdsc->mutex | |
389 | */ | |
390 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
391 | int mds) | |
392 | { | |
393 | struct ceph_mds_session *session; | |
394 | ||
395 | if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL) | |
396 | return NULL; | |
397 | session = mdsc->sessions[mds]; | |
398 | dout("lookup_mds_session %p %d\n", session, | |
399 | atomic_read(&session->s_ref)); | |
400 | get_session(session); | |
401 | return session; | |
402 | } | |
403 | ||
404 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
405 | { | |
406 | if (mds >= mdsc->max_sessions) | |
407 | return false; | |
408 | return mdsc->sessions[mds]; | |
409 | } | |
410 | ||
2600d2dd SW |
411 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
412 | struct ceph_mds_session *s) | |
413 | { | |
414 | if (s->s_mds >= mdsc->max_sessions || | |
415 | mdsc->sessions[s->s_mds] != s) | |
416 | return -ENOENT; | |
417 | return 0; | |
418 | } | |
419 | ||
2f2dc053 SW |
420 | /* |
421 | * create+register a new session for given mds. | |
422 | * called under mdsc->mutex. | |
423 | */ | |
424 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
425 | int mds) | |
426 | { | |
427 | struct ceph_mds_session *s; | |
428 | ||
c338c07c NY |
429 | if (mds >= mdsc->mdsmap->m_max_mds) |
430 | return ERR_PTR(-EINVAL); | |
431 | ||
2f2dc053 | 432 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
433 | if (!s) |
434 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
435 | s->s_mdsc = mdsc; |
436 | s->s_mds = mds; | |
437 | s->s_state = CEPH_MDS_SESSION_NEW; | |
438 | s->s_ttl = 0; | |
439 | s->s_seq = 0; | |
440 | mutex_init(&s->s_mutex); | |
441 | ||
b7a9e5dd | 442 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 443 | |
d8fb02ab | 444 | spin_lock_init(&s->s_gen_ttl_lock); |
2f2dc053 | 445 | s->s_cap_gen = 0; |
1ce208a6 | 446 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
447 | |
448 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 SW |
449 | s->s_renew_requested = 0; |
450 | s->s_renew_seq = 0; | |
451 | INIT_LIST_HEAD(&s->s_caps); | |
452 | s->s_nr_caps = 0; | |
5dacf091 | 453 | s->s_trim_caps = 0; |
2f2dc053 SW |
454 | atomic_set(&s->s_ref, 1); |
455 | INIT_LIST_HEAD(&s->s_waiting); | |
456 | INIT_LIST_HEAD(&s->s_unsafe); | |
457 | s->s_num_cap_releases = 0; | |
99a9c273 | 458 | s->s_cap_reconnect = 0; |
7c1332b8 | 459 | s->s_cap_iterator = NULL; |
2f2dc053 SW |
460 | INIT_LIST_HEAD(&s->s_cap_releases); |
461 | INIT_LIST_HEAD(&s->s_cap_releases_done); | |
462 | INIT_LIST_HEAD(&s->s_cap_flushing); | |
463 | INIT_LIST_HEAD(&s->s_cap_snaps_flushing); | |
464 | ||
465 | dout("register_session mds%d\n", mds); | |
466 | if (mds >= mdsc->max_sessions) { | |
467 | int newmax = 1 << get_count_order(mds+1); | |
468 | struct ceph_mds_session **sa; | |
469 | ||
470 | dout("register_session realloc to %d\n", newmax); | |
471 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
472 | if (sa == NULL) | |
42ce56e5 | 473 | goto fail_realloc; |
2f2dc053 SW |
474 | if (mdsc->sessions) { |
475 | memcpy(sa, mdsc->sessions, | |
476 | mdsc->max_sessions * sizeof(void *)); | |
477 | kfree(mdsc->sessions); | |
478 | } | |
479 | mdsc->sessions = sa; | |
480 | mdsc->max_sessions = newmax; | |
481 | } | |
482 | mdsc->sessions[mds] = s; | |
483 | atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */ | |
42ce56e5 | 484 | |
b7a9e5dd SW |
485 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
486 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 487 | |
2f2dc053 | 488 | return s; |
42ce56e5 SW |
489 | |
490 | fail_realloc: | |
491 | kfree(s); | |
492 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
493 | } |
494 | ||
495 | /* | |
496 | * called under mdsc->mutex | |
497 | */ | |
2600d2dd | 498 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 499 | struct ceph_mds_session *s) |
2f2dc053 | 500 | { |
2600d2dd SW |
501 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
502 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
503 | mdsc->sessions[s->s_mds] = NULL; |
504 | ceph_con_close(&s->s_con); | |
505 | ceph_put_mds_session(s); | |
2f2dc053 SW |
506 | } |
507 | ||
508 | /* | |
509 | * drop session refs in request. | |
510 | * | |
511 | * should be last request ref, or hold mdsc->mutex | |
512 | */ | |
513 | static void put_request_session(struct ceph_mds_request *req) | |
514 | { | |
515 | if (req->r_session) { | |
516 | ceph_put_mds_session(req->r_session); | |
517 | req->r_session = NULL; | |
518 | } | |
519 | } | |
520 | ||
153c8e6b | 521 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 522 | { |
153c8e6b SW |
523 | struct ceph_mds_request *req = container_of(kref, |
524 | struct ceph_mds_request, | |
525 | r_kref); | |
54008399 | 526 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
527 | if (req->r_request) |
528 | ceph_msg_put(req->r_request); | |
54008399 | 529 | if (req->r_reply) |
153c8e6b | 530 | ceph_msg_put(req->r_reply); |
153c8e6b | 531 | if (req->r_inode) { |
41b02e1f | 532 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
533 | iput(req->r_inode); |
534 | } | |
535 | if (req->r_locked_dir) | |
41b02e1f | 536 | ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); |
e96a650a | 537 | iput(req->r_target_inode); |
153c8e6b SW |
538 | if (req->r_dentry) |
539 | dput(req->r_dentry); | |
844d87c3 SW |
540 | if (req->r_old_dentry) |
541 | dput(req->r_old_dentry); | |
542 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
543 | /* |
544 | * track (and drop pins for) r_old_dentry_dir | |
545 | * separately, since r_old_dentry's d_parent may have | |
546 | * changed between the dir mutex being dropped and | |
547 | * this request being freed. | |
548 | */ | |
549 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
550 | CEPH_CAP_PIN); | |
41b02e1f | 551 | iput(req->r_old_dentry_dir); |
2f2dc053 | 552 | } |
153c8e6b SW |
553 | kfree(req->r_path1); |
554 | kfree(req->r_path2); | |
25e6bae3 YZ |
555 | if (req->r_pagelist) |
556 | ceph_pagelist_release(req->r_pagelist); | |
153c8e6b | 557 | put_request_session(req); |
37151668 | 558 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 559 | kfree(req); |
2f2dc053 SW |
560 | } |
561 | ||
562 | /* | |
563 | * lookup session, bump ref if found. | |
564 | * | |
565 | * called under mdsc->mutex. | |
566 | */ | |
567 | static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc, | |
568 | u64 tid) | |
569 | { | |
570 | struct ceph_mds_request *req; | |
44ca18f2 SW |
571 | struct rb_node *n = mdsc->request_tree.rb_node; |
572 | ||
573 | while (n) { | |
574 | req = rb_entry(n, struct ceph_mds_request, r_node); | |
575 | if (tid < req->r_tid) | |
576 | n = n->rb_left; | |
577 | else if (tid > req->r_tid) | |
578 | n = n->rb_right; | |
579 | else { | |
580 | ceph_mdsc_get_request(req); | |
581 | return req; | |
582 | } | |
583 | } | |
584 | return NULL; | |
585 | } | |
586 | ||
587 | static void __insert_request(struct ceph_mds_client *mdsc, | |
588 | struct ceph_mds_request *new) | |
589 | { | |
590 | struct rb_node **p = &mdsc->request_tree.rb_node; | |
591 | struct rb_node *parent = NULL; | |
592 | struct ceph_mds_request *req = NULL; | |
593 | ||
594 | while (*p) { | |
595 | parent = *p; | |
596 | req = rb_entry(parent, struct ceph_mds_request, r_node); | |
597 | if (new->r_tid < req->r_tid) | |
598 | p = &(*p)->rb_left; | |
599 | else if (new->r_tid > req->r_tid) | |
600 | p = &(*p)->rb_right; | |
601 | else | |
602 | BUG(); | |
603 | } | |
604 | ||
605 | rb_link_node(&new->r_node, parent, p); | |
606 | rb_insert_color(&new->r_node, &mdsc->request_tree); | |
2f2dc053 SW |
607 | } |
608 | ||
609 | /* | |
610 | * Register an in-flight request, and assign a tid. Link to directory | |
611 | * are modifying (if any). | |
612 | * | |
613 | * Called under mdsc->mutex. | |
614 | */ | |
615 | static void __register_request(struct ceph_mds_client *mdsc, | |
616 | struct ceph_mds_request *req, | |
617 | struct inode *dir) | |
618 | { | |
619 | req->r_tid = ++mdsc->last_tid; | |
620 | if (req->r_num_caps) | |
37151668 YS |
621 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
622 | req->r_num_caps); | |
2f2dc053 SW |
623 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
624 | ceph_mdsc_get_request(req); | |
44ca18f2 | 625 | __insert_request(mdsc, req); |
2f2dc053 | 626 | |
cb4276cc SW |
627 | req->r_uid = current_fsuid(); |
628 | req->r_gid = current_fsgid(); | |
629 | ||
2f2dc053 SW |
630 | if (dir) { |
631 | struct ceph_inode_info *ci = ceph_inode(dir); | |
632 | ||
3b663780 | 633 | ihold(dir); |
2f2dc053 SW |
634 | spin_lock(&ci->i_unsafe_lock); |
635 | req->r_unsafe_dir = dir; | |
636 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
637 | spin_unlock(&ci->i_unsafe_lock); | |
638 | } | |
639 | } | |
640 | ||
641 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
642 | struct ceph_mds_request *req) | |
643 | { | |
644 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
44ca18f2 | 645 | rb_erase(&req->r_node, &mdsc->request_tree); |
80fc7314 | 646 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
647 | |
648 | if (req->r_unsafe_dir) { | |
649 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); | |
650 | ||
651 | spin_lock(&ci->i_unsafe_lock); | |
652 | list_del_init(&req->r_unsafe_dir_item); | |
653 | spin_unlock(&ci->i_unsafe_lock); | |
3b663780 SW |
654 | |
655 | iput(req->r_unsafe_dir); | |
656 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 657 | } |
94aa8ae1 | 658 | |
fc55d2c9 YZ |
659 | complete_all(&req->r_safe_completion); |
660 | ||
94aa8ae1 | 661 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
662 | } |
663 | ||
664 | /* | |
665 | * Choose mds to send request to next. If there is a hint set in the | |
666 | * request (e.g., due to a prior forward hint from the mds), use that. | |
667 | * Otherwise, consult frag tree and/or caps to identify the | |
668 | * appropriate mds. If all else fails, choose randomly. | |
669 | * | |
670 | * Called under mdsc->mutex. | |
671 | */ | |
7fd7d101 | 672 | static struct dentry *get_nonsnap_parent(struct dentry *dentry) |
eb6bb1c5 | 673 | { |
d79698da SW |
674 | /* |
675 | * we don't need to worry about protecting the d_parent access | |
676 | * here because we never renaming inside the snapped namespace | |
677 | * except to resplice to another snapdir, and either the old or new | |
678 | * result is a valid result. | |
679 | */ | |
eb6bb1c5 SW |
680 | while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP) |
681 | dentry = dentry->d_parent; | |
682 | return dentry; | |
683 | } | |
684 | ||
2f2dc053 SW |
685 | static int __choose_mds(struct ceph_mds_client *mdsc, |
686 | struct ceph_mds_request *req) | |
687 | { | |
688 | struct inode *inode; | |
689 | struct ceph_inode_info *ci; | |
690 | struct ceph_cap *cap; | |
691 | int mode = req->r_direct_mode; | |
692 | int mds = -1; | |
693 | u32 hash = req->r_direct_hash; | |
694 | bool is_hash = req->r_direct_is_hash; | |
695 | ||
696 | /* | |
697 | * is there a specific mds we should try? ignore hint if we have | |
698 | * no session and the mds is not up (active or recovering). | |
699 | */ | |
700 | if (req->r_resend_mds >= 0 && | |
701 | (__have_session(mdsc, req->r_resend_mds) || | |
702 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
703 | dout("choose_mds using resend_mds mds%d\n", | |
704 | req->r_resend_mds); | |
705 | return req->r_resend_mds; | |
706 | } | |
707 | ||
708 | if (mode == USE_RANDOM_MDS) | |
709 | goto random; | |
710 | ||
711 | inode = NULL; | |
712 | if (req->r_inode) { | |
713 | inode = req->r_inode; | |
714 | } else if (req->r_dentry) { | |
d79698da SW |
715 | /* ignore race with rename; old or new d_parent is okay */ |
716 | struct dentry *parent = req->r_dentry->d_parent; | |
717 | struct inode *dir = parent->d_inode; | |
eb6bb1c5 | 718 | |
3d14c5d2 | 719 | if (dir->i_sb != mdsc->fsc->sb) { |
eb6bb1c5 SW |
720 | /* not this fs! */ |
721 | inode = req->r_dentry->d_inode; | |
722 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { | |
723 | /* direct snapped/virtual snapdir requests | |
724 | * based on parent dir inode */ | |
d79698da | 725 | struct dentry *dn = get_nonsnap_parent(parent); |
eb6bb1c5 SW |
726 | inode = dn->d_inode; |
727 | dout("__choose_mds using nonsnap parent %p\n", inode); | |
ca18bede | 728 | } else { |
eb6bb1c5 | 729 | /* dentry target */ |
2f2dc053 | 730 | inode = req->r_dentry->d_inode; |
ca18bede YZ |
731 | if (!inode || mode == USE_AUTH_MDS) { |
732 | /* dir + name */ | |
733 | inode = dir; | |
734 | hash = ceph_dentry_hash(dir, req->r_dentry); | |
735 | is_hash = true; | |
736 | } | |
2f2dc053 SW |
737 | } |
738 | } | |
eb6bb1c5 | 739 | |
2f2dc053 SW |
740 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
741 | (int)hash, mode); | |
742 | if (!inode) | |
743 | goto random; | |
744 | ci = ceph_inode(inode); | |
745 | ||
746 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
747 | struct ceph_inode_frag frag; | |
748 | int found; | |
749 | ||
750 | ceph_choose_frag(ci, hash, &frag, &found); | |
751 | if (found) { | |
752 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
753 | u8 r; | |
754 | ||
755 | /* choose a random replica */ | |
756 | get_random_bytes(&r, 1); | |
757 | r %= frag.ndist; | |
758 | mds = frag.dist[r]; | |
759 | dout("choose_mds %p %llx.%llx " | |
760 | "frag %u mds%d (%d/%d)\n", | |
761 | inode, ceph_vinop(inode), | |
d66bbd44 | 762 | frag.frag, mds, |
2f2dc053 | 763 | (int)r, frag.ndist); |
d66bbd44 SW |
764 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
765 | CEPH_MDS_STATE_ACTIVE) | |
766 | return mds; | |
2f2dc053 SW |
767 | } |
768 | ||
769 | /* since this file/dir wasn't known to be | |
770 | * replicated, then we want to look for the | |
771 | * authoritative mds. */ | |
772 | mode = USE_AUTH_MDS; | |
773 | if (frag.mds >= 0) { | |
774 | /* choose auth mds */ | |
775 | mds = frag.mds; | |
776 | dout("choose_mds %p %llx.%llx " | |
777 | "frag %u mds%d (auth)\n", | |
778 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
779 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
780 | CEPH_MDS_STATE_ACTIVE) | |
781 | return mds; | |
2f2dc053 SW |
782 | } |
783 | } | |
784 | } | |
785 | ||
be655596 | 786 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
787 | cap = NULL; |
788 | if (mode == USE_AUTH_MDS) | |
789 | cap = ci->i_auth_cap; | |
790 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
791 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
792 | if (!cap) { | |
be655596 | 793 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
794 | goto random; |
795 | } | |
796 | mds = cap->session->s_mds; | |
797 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
798 | inode, ceph_vinop(inode), mds, | |
799 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 800 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
801 | return mds; |
802 | ||
803 | random: | |
804 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
805 | dout("choose_mds chose random mds%d\n", mds); | |
806 | return mds; | |
807 | } | |
808 | ||
809 | ||
810 | /* | |
811 | * session messages | |
812 | */ | |
813 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
814 | { | |
815 | struct ceph_msg *msg; | |
816 | struct ceph_mds_session_head *h; | |
817 | ||
b61c2763 SW |
818 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
819 | false); | |
a79832f2 | 820 | if (!msg) { |
2f2dc053 | 821 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 822 | return NULL; |
2f2dc053 SW |
823 | } |
824 | h = msg->front.iov_base; | |
825 | h->op = cpu_to_le32(op); | |
826 | h->seq = cpu_to_le64(seq); | |
dbd0c8bf JS |
827 | |
828 | return msg; | |
829 | } | |
830 | ||
831 | /* | |
832 | * session message, specialization for CEPH_SESSION_REQUEST_OPEN | |
833 | * to include additional client metadata fields. | |
834 | */ | |
835 | static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) | |
836 | { | |
837 | struct ceph_msg *msg; | |
838 | struct ceph_mds_session_head *h; | |
839 | int i = -1; | |
840 | int metadata_bytes = 0; | |
841 | int metadata_key_count = 0; | |
842 | struct ceph_options *opt = mdsc->fsc->client->options; | |
843 | void *p; | |
844 | ||
845 | const char* metadata[3][2] = { | |
846 | {"hostname", utsname()->nodename}, | |
847 | {"entity_id", opt->name ? opt->name : ""}, | |
848 | {NULL, NULL} | |
849 | }; | |
850 | ||
851 | /* Calculate serialized length of metadata */ | |
852 | metadata_bytes = 4; /* map length */ | |
853 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
854 | metadata_bytes += 8 + strlen(metadata[i][0]) + | |
855 | strlen(metadata[i][1]); | |
856 | metadata_key_count++; | |
857 | } | |
858 | ||
859 | /* Allocate the message */ | |
860 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, | |
861 | GFP_NOFS, false); | |
862 | if (!msg) { | |
863 | pr_err("create_session_msg ENOMEM creating msg\n"); | |
864 | return NULL; | |
865 | } | |
866 | h = msg->front.iov_base; | |
867 | h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); | |
868 | h->seq = cpu_to_le64(seq); | |
869 | ||
870 | /* | |
871 | * Serialize client metadata into waiting buffer space, using | |
872 | * the format that userspace expects for map<string, string> | |
7cfa0313 JS |
873 | * |
874 | * ClientSession messages with metadata are v2 | |
dbd0c8bf | 875 | */ |
7cfa0313 JS |
876 | msg->hdr.version = cpu_to_le16(2); |
877 | msg->hdr.compat_version = cpu_to_le16(1); | |
dbd0c8bf JS |
878 | |
879 | /* The write pointer, following the session_head structure */ | |
880 | p = msg->front.iov_base + sizeof(*h); | |
881 | ||
882 | /* Number of entries in the map */ | |
883 | ceph_encode_32(&p, metadata_key_count); | |
884 | ||
885 | /* Two length-prefixed strings for each entry in the map */ | |
886 | for (i = 0; metadata[i][0] != NULL; ++i) { | |
887 | size_t const key_len = strlen(metadata[i][0]); | |
888 | size_t const val_len = strlen(metadata[i][1]); | |
889 | ||
890 | ceph_encode_32(&p, key_len); | |
891 | memcpy(p, metadata[i][0], key_len); | |
892 | p += key_len; | |
893 | ceph_encode_32(&p, val_len); | |
894 | memcpy(p, metadata[i][1], val_len); | |
895 | p += val_len; | |
896 | } | |
897 | ||
2f2dc053 SW |
898 | return msg; |
899 | } | |
900 | ||
901 | /* | |
902 | * send session open request. | |
903 | * | |
904 | * called under mdsc->mutex | |
905 | */ | |
906 | static int __open_session(struct ceph_mds_client *mdsc, | |
907 | struct ceph_mds_session *session) | |
908 | { | |
909 | struct ceph_msg *msg; | |
910 | int mstate; | |
911 | int mds = session->s_mds; | |
2f2dc053 SW |
912 | |
913 | /* wait for mds to go active? */ | |
914 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
915 | dout("open_session to mds%d (%s)\n", mds, | |
916 | ceph_mds_state_name(mstate)); | |
917 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
918 | session->s_renew_requested = jiffies; | |
919 | ||
920 | /* send connect message */ | |
dbd0c8bf | 921 | msg = create_session_open_msg(mdsc, session->s_seq); |
a79832f2 SW |
922 | if (!msg) |
923 | return -ENOMEM; | |
2f2dc053 | 924 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
925 | return 0; |
926 | } | |
927 | ||
ed0552a1 SW |
928 | /* |
929 | * open sessions for any export targets for the given mds | |
930 | * | |
931 | * called under mdsc->mutex | |
932 | */ | |
5d72d13c YZ |
933 | static struct ceph_mds_session * |
934 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
935 | { | |
936 | struct ceph_mds_session *session; | |
937 | ||
938 | session = __ceph_lookup_mds_session(mdsc, target); | |
939 | if (!session) { | |
940 | session = register_session(mdsc, target); | |
941 | if (IS_ERR(session)) | |
942 | return session; | |
943 | } | |
944 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
945 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
946 | __open_session(mdsc, session); | |
947 | ||
948 | return session; | |
949 | } | |
950 | ||
951 | struct ceph_mds_session * | |
952 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
953 | { | |
954 | struct ceph_mds_session *session; | |
955 | ||
956 | dout("open_export_target_session to mds%d\n", target); | |
957 | ||
958 | mutex_lock(&mdsc->mutex); | |
959 | session = __open_export_target_session(mdsc, target); | |
960 | mutex_unlock(&mdsc->mutex); | |
961 | ||
962 | return session; | |
963 | } | |
964 | ||
ed0552a1 SW |
965 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
966 | struct ceph_mds_session *session) | |
967 | { | |
968 | struct ceph_mds_info *mi; | |
969 | struct ceph_mds_session *ts; | |
970 | int i, mds = session->s_mds; | |
ed0552a1 SW |
971 | |
972 | if (mds >= mdsc->mdsmap->m_max_mds) | |
973 | return; | |
5d72d13c | 974 | |
ed0552a1 SW |
975 | mi = &mdsc->mdsmap->m_info[mds]; |
976 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
977 | session->s_mds, mi->num_export_targets); | |
978 | ||
979 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c YZ |
980 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
981 | if (!IS_ERR(ts)) | |
982 | ceph_put_mds_session(ts); | |
ed0552a1 SW |
983 | } |
984 | } | |
985 | ||
154f42c2 SW |
986 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
987 | struct ceph_mds_session *session) | |
988 | { | |
989 | mutex_lock(&mdsc->mutex); | |
990 | __open_export_target_sessions(mdsc, session); | |
991 | mutex_unlock(&mdsc->mutex); | |
992 | } | |
993 | ||
2f2dc053 SW |
994 | /* |
995 | * session caps | |
996 | */ | |
997 | ||
998 | /* | |
999 | * Free preallocated cap messages assigned to this session | |
1000 | */ | |
1001 | static void cleanup_cap_releases(struct ceph_mds_session *session) | |
1002 | { | |
1003 | struct ceph_msg *msg; | |
1004 | ||
1005 | spin_lock(&session->s_cap_lock); | |
1006 | while (!list_empty(&session->s_cap_releases)) { | |
1007 | msg = list_first_entry(&session->s_cap_releases, | |
1008 | struct ceph_msg, list_head); | |
1009 | list_del_init(&msg->list_head); | |
1010 | ceph_msg_put(msg); | |
1011 | } | |
1012 | while (!list_empty(&session->s_cap_releases_done)) { | |
1013 | msg = list_first_entry(&session->s_cap_releases_done, | |
1014 | struct ceph_msg, list_head); | |
1015 | list_del_init(&msg->list_head); | |
1016 | ceph_msg_put(msg); | |
1017 | } | |
1018 | spin_unlock(&session->s_cap_lock); | |
1019 | } | |
1020 | ||
1021 | /* | |
f818a736 SW |
1022 | * Helper to safely iterate over all caps associated with a session, with |
1023 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 1024 | * |
f818a736 | 1025 | * Caller must hold session s_mutex. |
2f2dc053 SW |
1026 | */ |
1027 | static int iterate_session_caps(struct ceph_mds_session *session, | |
1028 | int (*cb)(struct inode *, struct ceph_cap *, | |
1029 | void *), void *arg) | |
1030 | { | |
7c1332b8 SW |
1031 | struct list_head *p; |
1032 | struct ceph_cap *cap; | |
1033 | struct inode *inode, *last_inode = NULL; | |
1034 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
1035 | int ret; |
1036 | ||
1037 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
1038 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
1039 | p = session->s_caps.next; |
1040 | while (p != &session->s_caps) { | |
1041 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 1042 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
1043 | if (!inode) { |
1044 | p = p->next; | |
2f2dc053 | 1045 | continue; |
7c1332b8 SW |
1046 | } |
1047 | session->s_cap_iterator = cap; | |
2f2dc053 | 1048 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1049 | |
1050 | if (last_inode) { | |
1051 | iput(last_inode); | |
1052 | last_inode = NULL; | |
1053 | } | |
1054 | if (old_cap) { | |
37151668 | 1055 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
1056 | old_cap = NULL; |
1057 | } | |
1058 | ||
2f2dc053 | 1059 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
1060 | last_inode = inode; |
1061 | ||
2f2dc053 | 1062 | spin_lock(&session->s_cap_lock); |
7c1332b8 SW |
1063 | p = p->next; |
1064 | if (cap->ci == NULL) { | |
1065 | dout("iterate_session_caps finishing cap %p removal\n", | |
1066 | cap); | |
1067 | BUG_ON(cap->session != session); | |
1068 | list_del_init(&cap->session_caps); | |
1069 | session->s_nr_caps--; | |
1070 | cap->session = NULL; | |
1071 | old_cap = cap; /* put_cap it w/o locks held */ | |
1072 | } | |
5dacf091 SW |
1073 | if (ret < 0) |
1074 | goto out; | |
2f2dc053 | 1075 | } |
5dacf091 SW |
1076 | ret = 0; |
1077 | out: | |
7c1332b8 | 1078 | session->s_cap_iterator = NULL; |
2f2dc053 | 1079 | spin_unlock(&session->s_cap_lock); |
7c1332b8 | 1080 | |
e96a650a | 1081 | iput(last_inode); |
7c1332b8 | 1082 | if (old_cap) |
37151668 | 1083 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1084 | |
5dacf091 | 1085 | return ret; |
2f2dc053 SW |
1086 | } |
1087 | ||
1088 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1089 | void *arg) |
2f2dc053 SW |
1090 | { |
1091 | struct ceph_inode_info *ci = ceph_inode(inode); | |
6c99f254 SW |
1092 | int drop = 0; |
1093 | ||
2f2dc053 SW |
1094 | dout("removing cap %p, ci is %p, inode is %p\n", |
1095 | cap, ci, &ci->vfs_inode); | |
be655596 | 1096 | spin_lock(&ci->i_ceph_lock); |
a096b09a | 1097 | __ceph_remove_cap(cap, false); |
6c99f254 SW |
1098 | if (!__ceph_is_any_real_caps(ci)) { |
1099 | struct ceph_mds_client *mdsc = | |
3d14c5d2 | 1100 | ceph_sb_to_client(inode->i_sb)->mdsc; |
6c99f254 SW |
1101 | |
1102 | spin_lock(&mdsc->cap_dirty_lock); | |
1103 | if (!list_empty(&ci->i_dirty_item)) { | |
1104 | pr_info(" dropping dirty %s state for %p %lld\n", | |
1105 | ceph_cap_string(ci->i_dirty_caps), | |
1106 | inode, ceph_ino(inode)); | |
1107 | ci->i_dirty_caps = 0; | |
1108 | list_del_init(&ci->i_dirty_item); | |
1109 | drop = 1; | |
1110 | } | |
1111 | if (!list_empty(&ci->i_flushing_item)) { | |
1112 | pr_info(" dropping dirty+flushing %s state for %p %lld\n", | |
1113 | ceph_cap_string(ci->i_flushing_caps), | |
1114 | inode, ceph_ino(inode)); | |
1115 | ci->i_flushing_caps = 0; | |
1116 | list_del_init(&ci->i_flushing_item); | |
1117 | mdsc->num_cap_flushing--; | |
1118 | drop = 1; | |
1119 | } | |
1120 | if (drop && ci->i_wrbuffer_ref) { | |
1121 | pr_info(" dropping dirty data for %p %lld\n", | |
1122 | inode, ceph_ino(inode)); | |
1123 | ci->i_wrbuffer_ref = 0; | |
1124 | ci->i_wrbuffer_ref_head = 0; | |
1125 | drop++; | |
1126 | } | |
1127 | spin_unlock(&mdsc->cap_dirty_lock); | |
1128 | } | |
be655596 | 1129 | spin_unlock(&ci->i_ceph_lock); |
6c99f254 SW |
1130 | while (drop--) |
1131 | iput(inode); | |
2f2dc053 SW |
1132 | return 0; |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * caller must hold session s_mutex | |
1137 | */ | |
1138 | static void remove_session_caps(struct ceph_mds_session *session) | |
1139 | { | |
1140 | dout("remove_session_caps on %p\n", session); | |
1141 | iterate_session_caps(session, remove_session_caps_cb, NULL); | |
6f60f889 YZ |
1142 | |
1143 | spin_lock(&session->s_cap_lock); | |
1144 | if (session->s_nr_caps > 0) { | |
1145 | struct super_block *sb = session->s_mdsc->fsc->sb; | |
1146 | struct inode *inode; | |
1147 | struct ceph_cap *cap, *prev = NULL; | |
1148 | struct ceph_vino vino; | |
1149 | /* | |
1150 | * iterate_session_caps() skips inodes that are being | |
1151 | * deleted, we need to wait until deletions are complete. | |
1152 | * __wait_on_freeing_inode() is designed for the job, | |
1153 | * but it is not exported, so use lookup inode function | |
1154 | * to access it. | |
1155 | */ | |
1156 | while (!list_empty(&session->s_caps)) { | |
1157 | cap = list_entry(session->s_caps.next, | |
1158 | struct ceph_cap, session_caps); | |
1159 | if (cap == prev) | |
1160 | break; | |
1161 | prev = cap; | |
1162 | vino = cap->ci->i_vino; | |
1163 | spin_unlock(&session->s_cap_lock); | |
1164 | ||
ed284c49 | 1165 | inode = ceph_find_inode(sb, vino); |
6f60f889 YZ |
1166 | iput(inode); |
1167 | ||
1168 | spin_lock(&session->s_cap_lock); | |
1169 | } | |
1170 | } | |
1171 | spin_unlock(&session->s_cap_lock); | |
1172 | ||
2f2dc053 | 1173 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1174 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
2f2dc053 SW |
1175 | cleanup_cap_releases(session); |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * wake up any threads waiting on this session's caps. if the cap is | |
1180 | * old (didn't get renewed on the client reconnect), remove it now. | |
1181 | * | |
1182 | * caller must hold s_mutex. | |
1183 | */ | |
1184 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1185 | void *arg) | |
1186 | { | |
0dc2570f SW |
1187 | struct ceph_inode_info *ci = ceph_inode(inode); |
1188 | ||
03066f23 | 1189 | wake_up_all(&ci->i_cap_wq); |
0dc2570f | 1190 | if (arg) { |
be655596 | 1191 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1192 | ci->i_wanted_max_size = 0; |
1193 | ci->i_requested_max_size = 0; | |
be655596 | 1194 | spin_unlock(&ci->i_ceph_lock); |
0dc2570f | 1195 | } |
2f2dc053 SW |
1196 | return 0; |
1197 | } | |
1198 | ||
0dc2570f SW |
1199 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1200 | int reconnect) | |
2f2dc053 SW |
1201 | { |
1202 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1203 | iterate_session_caps(session, wake_up_session_cb, |
1204 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1205 | } |
1206 | ||
1207 | /* | |
1208 | * Send periodic message to MDS renewing all currently held caps. The | |
1209 | * ack will reset the expiration for all caps from this session. | |
1210 | * | |
1211 | * caller holds s_mutex | |
1212 | */ | |
1213 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1214 | struct ceph_mds_session *session) | |
1215 | { | |
1216 | struct ceph_msg *msg; | |
1217 | int state; | |
1218 | ||
1219 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1220 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1221 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1222 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1223 | |
1224 | /* do not try to renew caps until a recovering mds has reconnected | |
1225 | * with its clients. */ | |
1226 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1227 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1228 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1229 | session->s_mds, ceph_mds_state_name(state)); | |
1230 | return 0; | |
1231 | } | |
1232 | ||
1233 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1234 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1235 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1236 | ++session->s_renew_seq); | |
a79832f2 SW |
1237 | if (!msg) |
1238 | return -ENOMEM; | |
2f2dc053 SW |
1239 | ceph_con_send(&session->s_con, msg); |
1240 | return 0; | |
1241 | } | |
1242 | ||
186e4f7a YZ |
1243 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1244 | struct ceph_mds_session *session, u64 seq) | |
1245 | { | |
1246 | struct ceph_msg *msg; | |
1247 | ||
1248 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
a687ecaf | 1249 | session->s_mds, ceph_session_state_name(session->s_state), seq); |
186e4f7a YZ |
1250 | msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); |
1251 | if (!msg) | |
1252 | return -ENOMEM; | |
1253 | ceph_con_send(&session->s_con, msg); | |
1254 | return 0; | |
1255 | } | |
1256 | ||
1257 | ||
2f2dc053 SW |
1258 | /* |
1259 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1260 | * |
1261 | * Called under session->s_mutex | |
2f2dc053 SW |
1262 | */ |
1263 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1264 | struct ceph_mds_session *session, int is_renew) | |
1265 | { | |
1266 | int was_stale; | |
1267 | int wake = 0; | |
1268 | ||
1269 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1270 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1271 | |
1272 | session->s_cap_ttl = session->s_renew_requested + | |
1273 | mdsc->mdsmap->m_session_timeout*HZ; | |
1274 | ||
1275 | if (was_stale) { | |
1276 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1277 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1278 | wake = 1; | |
1279 | } else { | |
1280 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1281 | } | |
1282 | } | |
1283 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1284 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1285 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1286 | spin_unlock(&session->s_cap_lock); | |
1287 | ||
1288 | if (wake) | |
0dc2570f | 1289 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1290 | } |
1291 | ||
1292 | /* | |
1293 | * send a session close request | |
1294 | */ | |
1295 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1296 | struct ceph_mds_session *session) | |
1297 | { | |
1298 | struct ceph_msg *msg; | |
2f2dc053 SW |
1299 | |
1300 | dout("request_close_session mds%d state %s seq %lld\n", | |
a687ecaf | 1301 | session->s_mds, ceph_session_state_name(session->s_state), |
2f2dc053 SW |
1302 | session->s_seq); |
1303 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1304 | if (!msg) |
1305 | return -ENOMEM; | |
1306 | ceph_con_send(&session->s_con, msg); | |
1307 | return 0; | |
2f2dc053 SW |
1308 | } |
1309 | ||
1310 | /* | |
1311 | * Called with s_mutex held. | |
1312 | */ | |
1313 | static int __close_session(struct ceph_mds_client *mdsc, | |
1314 | struct ceph_mds_session *session) | |
1315 | { | |
1316 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1317 | return 0; | |
1318 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1319 | return request_close_session(mdsc, session); | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Trim old(er) caps. | |
1324 | * | |
1325 | * Because we can't cache an inode without one or more caps, we do | |
1326 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1327 | * point the inode will hopefully get dropped to. | |
1328 | * | |
1329 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1330 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1331 | */ | |
1332 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1333 | { | |
1334 | struct ceph_mds_session *session = arg; | |
1335 | struct ceph_inode_info *ci = ceph_inode(inode); | |
979abfdd | 1336 | int used, wanted, oissued, mine; |
2f2dc053 SW |
1337 | |
1338 | if (session->s_trim_caps <= 0) | |
1339 | return -1; | |
1340 | ||
be655596 | 1341 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1342 | mine = cap->issued | cap->implemented; |
1343 | used = __ceph_caps_used(ci); | |
979abfdd | 1344 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1345 | oissued = __ceph_caps_issued_other(ci, cap); |
1346 | ||
979abfdd | 1347 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1348 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1349 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1350 | if (cap == ci->i_auth_cap) { | |
1351 | if (ci->i_dirty_caps | ci->i_flushing_caps) | |
1352 | goto out; | |
1353 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1354 | goto out; | |
1355 | } | |
1356 | if ((used | wanted) & ~oissued & mine) | |
2f2dc053 SW |
1357 | goto out; /* we need these caps */ |
1358 | ||
1359 | session->s_trim_caps--; | |
1360 | if (oissued) { | |
1361 | /* we aren't the only cap.. just remove us */ | |
a096b09a | 1362 | __ceph_remove_cap(cap, true); |
2f2dc053 SW |
1363 | } else { |
1364 | /* try to drop referring dentries */ | |
be655596 | 1365 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1366 | d_prune_aliases(inode); |
1367 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1368 | inode, cap, atomic_read(&inode->i_count)); | |
1369 | return 0; | |
1370 | } | |
1371 | ||
1372 | out: | |
be655596 | 1373 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1374 | return 0; |
1375 | } | |
1376 | ||
1377 | /* | |
1378 | * Trim session cap count down to some max number. | |
1379 | */ | |
1380 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1381 | struct ceph_mds_session *session, | |
1382 | int max_caps) | |
1383 | { | |
1384 | int trim_caps = session->s_nr_caps - max_caps; | |
1385 | ||
1386 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1387 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1388 | if (trim_caps > 0) { | |
1389 | session->s_trim_caps = trim_caps; | |
1390 | iterate_session_caps(session, trim_caps_cb, session); | |
1391 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1392 | session->s_mds, session->s_nr_caps, max_caps, | |
1393 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1394 | session->s_trim_caps = 0; |
2f2dc053 | 1395 | } |
a56371d9 YZ |
1396 | |
1397 | ceph_add_cap_releases(mdsc, session); | |
1398 | ceph_send_cap_releases(mdsc, session); | |
2f2dc053 SW |
1399 | return 0; |
1400 | } | |
1401 | ||
1402 | /* | |
1403 | * Allocate cap_release messages. If there is a partially full message | |
1404 | * in the queue, try to allocate enough to cover it's remainder, so that | |
1405 | * we can send it immediately. | |
1406 | * | |
1407 | * Called under s_mutex. | |
1408 | */ | |
2b2300d6 | 1409 | int ceph_add_cap_releases(struct ceph_mds_client *mdsc, |
ee6b272b | 1410 | struct ceph_mds_session *session) |
2f2dc053 | 1411 | { |
38e8883e | 1412 | struct ceph_msg *msg, *partial = NULL; |
2f2dc053 SW |
1413 | struct ceph_mds_cap_release *head; |
1414 | int err = -ENOMEM; | |
3d14c5d2 | 1415 | int extra = mdsc->fsc->mount_options->cap_release_safety; |
38e8883e | 1416 | int num; |
2f2dc053 | 1417 | |
38e8883e SW |
1418 | dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds, |
1419 | extra); | |
2f2dc053 SW |
1420 | |
1421 | spin_lock(&session->s_cap_lock); | |
1422 | ||
1423 | if (!list_empty(&session->s_cap_releases)) { | |
1424 | msg = list_first_entry(&session->s_cap_releases, | |
1425 | struct ceph_msg, | |
1426 | list_head); | |
1427 | head = msg->front.iov_base; | |
38e8883e SW |
1428 | num = le32_to_cpu(head->num); |
1429 | if (num) { | |
1430 | dout(" partial %p with (%d/%d)\n", msg, num, | |
1431 | (int)CEPH_CAPS_PER_RELEASE); | |
1432 | extra += CEPH_CAPS_PER_RELEASE - num; | |
1433 | partial = msg; | |
1434 | } | |
2f2dc053 | 1435 | } |
2f2dc053 SW |
1436 | while (session->s_num_cap_releases < session->s_nr_caps + extra) { |
1437 | spin_unlock(&session->s_cap_lock); | |
34d23762 | 1438 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE, |
b61c2763 | 1439 | GFP_NOFS, false); |
2f2dc053 SW |
1440 | if (!msg) |
1441 | goto out_unlocked; | |
1442 | dout("add_cap_releases %p msg %p now %d\n", session, msg, | |
1443 | (int)msg->front.iov_len); | |
1444 | head = msg->front.iov_base; | |
1445 | head->num = cpu_to_le32(0); | |
1446 | msg->front.iov_len = sizeof(*head); | |
1447 | spin_lock(&session->s_cap_lock); | |
1448 | list_add(&msg->list_head, &session->s_cap_releases); | |
1449 | session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE; | |
1450 | } | |
1451 | ||
38e8883e SW |
1452 | if (partial) { |
1453 | head = partial->front.iov_base; | |
1454 | num = le32_to_cpu(head->num); | |
1455 | dout(" queueing partial %p with %d/%d\n", partial, num, | |
1456 | (int)CEPH_CAPS_PER_RELEASE); | |
1457 | list_move_tail(&partial->list_head, | |
1458 | &session->s_cap_releases_done); | |
1459 | session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num; | |
2f2dc053 SW |
1460 | } |
1461 | err = 0; | |
1462 | spin_unlock(&session->s_cap_lock); | |
1463 | out_unlocked: | |
1464 | return err; | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * flush all dirty inode data to disk. | |
1469 | * | |
1470 | * returns true if we've flushed through want_flush_seq | |
1471 | */ | |
1472 | static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq) | |
1473 | { | |
1474 | int mds, ret = 1; | |
1475 | ||
1476 | dout("check_cap_flush want %lld\n", want_flush_seq); | |
1477 | mutex_lock(&mdsc->mutex); | |
1478 | for (mds = 0; ret && mds < mdsc->max_sessions; mds++) { | |
1479 | struct ceph_mds_session *session = mdsc->sessions[mds]; | |
1480 | ||
1481 | if (!session) | |
1482 | continue; | |
1483 | get_session(session); | |
1484 | mutex_unlock(&mdsc->mutex); | |
1485 | ||
1486 | mutex_lock(&session->s_mutex); | |
1487 | if (!list_empty(&session->s_cap_flushing)) { | |
1488 | struct ceph_inode_info *ci = | |
1489 | list_entry(session->s_cap_flushing.next, | |
1490 | struct ceph_inode_info, | |
1491 | i_flushing_item); | |
1492 | struct inode *inode = &ci->vfs_inode; | |
1493 | ||
be655596 | 1494 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1495 | if (ci->i_cap_flush_seq <= want_flush_seq) { |
1496 | dout("check_cap_flush still flushing %p " | |
1497 | "seq %lld <= %lld to mds%d\n", inode, | |
1498 | ci->i_cap_flush_seq, want_flush_seq, | |
1499 | session->s_mds); | |
1500 | ret = 0; | |
1501 | } | |
be655596 | 1502 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1503 | } |
1504 | mutex_unlock(&session->s_mutex); | |
1505 | ceph_put_mds_session(session); | |
1506 | ||
1507 | if (!ret) | |
1508 | return ret; | |
1509 | mutex_lock(&mdsc->mutex); | |
1510 | } | |
1511 | ||
1512 | mutex_unlock(&mdsc->mutex); | |
1513 | dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq); | |
1514 | return ret; | |
1515 | } | |
1516 | ||
1517 | /* | |
1518 | * called under s_mutex | |
1519 | */ | |
3d7ded4d SW |
1520 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1521 | struct ceph_mds_session *session) | |
2f2dc053 SW |
1522 | { |
1523 | struct ceph_msg *msg; | |
1524 | ||
1525 | dout("send_cap_releases mds%d\n", session->s_mds); | |
0f8605f2 SW |
1526 | spin_lock(&session->s_cap_lock); |
1527 | while (!list_empty(&session->s_cap_releases_done)) { | |
2f2dc053 SW |
1528 | msg = list_first_entry(&session->s_cap_releases_done, |
1529 | struct ceph_msg, list_head); | |
1530 | list_del_init(&msg->list_head); | |
1531 | spin_unlock(&session->s_cap_lock); | |
1532 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1533 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1534 | ceph_con_send(&session->s_con, msg); | |
0f8605f2 | 1535 | spin_lock(&session->s_cap_lock); |
2f2dc053 SW |
1536 | } |
1537 | spin_unlock(&session->s_cap_lock); | |
1538 | } | |
1539 | ||
e01a5946 SW |
1540 | static void discard_cap_releases(struct ceph_mds_client *mdsc, |
1541 | struct ceph_mds_session *session) | |
1542 | { | |
1543 | struct ceph_msg *msg; | |
1544 | struct ceph_mds_cap_release *head; | |
1545 | unsigned num; | |
1546 | ||
1547 | dout("discard_cap_releases mds%d\n", session->s_mds); | |
e01a5946 | 1548 | |
00bd8edb YZ |
1549 | if (!list_empty(&session->s_cap_releases)) { |
1550 | /* zero out the in-progress message */ | |
1551 | msg = list_first_entry(&session->s_cap_releases, | |
1552 | struct ceph_msg, list_head); | |
1553 | head = msg->front.iov_base; | |
1554 | num = le32_to_cpu(head->num); | |
1555 | dout("discard_cap_releases mds%d %p %u\n", | |
1556 | session->s_mds, msg, num); | |
1557 | head->num = cpu_to_le32(0); | |
1558 | msg->front.iov_len = sizeof(*head); | |
1559 | session->s_num_cap_releases += num; | |
1560 | } | |
e01a5946 SW |
1561 | |
1562 | /* requeue completed messages */ | |
1563 | while (!list_empty(&session->s_cap_releases_done)) { | |
1564 | msg = list_first_entry(&session->s_cap_releases_done, | |
1565 | struct ceph_msg, list_head); | |
1566 | list_del_init(&msg->list_head); | |
1567 | ||
1568 | head = msg->front.iov_base; | |
1569 | num = le32_to_cpu(head->num); | |
1570 | dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, | |
1571 | num); | |
1572 | session->s_num_cap_releases += num; | |
1573 | head->num = cpu_to_le32(0); | |
1574 | msg->front.iov_len = sizeof(*head); | |
1575 | list_add(&msg->list_head, &session->s_cap_releases); | |
1576 | } | |
e01a5946 SW |
1577 | } |
1578 | ||
2f2dc053 SW |
1579 | /* |
1580 | * requests | |
1581 | */ | |
1582 | ||
54008399 YZ |
1583 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
1584 | struct inode *dir) | |
1585 | { | |
1586 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1587 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
1588 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
1589 | size_t size = sizeof(*rinfo->dir_in) + sizeof(*rinfo->dir_dname_len) + | |
1590 | sizeof(*rinfo->dir_dname) + sizeof(*rinfo->dir_dlease); | |
1591 | int order, num_entries; | |
1592 | ||
1593 | spin_lock(&ci->i_ceph_lock); | |
1594 | num_entries = ci->i_files + ci->i_subdirs; | |
1595 | spin_unlock(&ci->i_ceph_lock); | |
1596 | num_entries = max(num_entries, 1); | |
1597 | num_entries = min(num_entries, opt->max_readdir); | |
1598 | ||
1599 | order = get_order(size * num_entries); | |
1600 | while (order >= 0) { | |
1601 | rinfo->dir_in = (void*)__get_free_pages(GFP_NOFS | __GFP_NOWARN, | |
1602 | order); | |
1603 | if (rinfo->dir_in) | |
1604 | break; | |
1605 | order--; | |
1606 | } | |
1607 | if (!rinfo->dir_in) | |
1608 | return -ENOMEM; | |
1609 | ||
1610 | num_entries = (PAGE_SIZE << order) / size; | |
1611 | num_entries = min(num_entries, opt->max_readdir); | |
1612 | ||
1613 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
1614 | req->r_num_caps = num_entries + 1; | |
1615 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
1616 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
1617 | return 0; | |
1618 | } | |
1619 | ||
2f2dc053 SW |
1620 | /* |
1621 | * Create an mds request. | |
1622 | */ | |
1623 | struct ceph_mds_request * | |
1624 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1625 | { | |
1626 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1627 | ||
1628 | if (!req) | |
1629 | return ERR_PTR(-ENOMEM); | |
1630 | ||
b4556396 | 1631 | mutex_init(&req->r_fill_mutex); |
37151668 | 1632 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1633 | req->r_started = jiffies; |
1634 | req->r_resend_mds = -1; | |
1635 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
1636 | req->r_fmode = -1; | |
153c8e6b | 1637 | kref_init(&req->r_kref); |
2f2dc053 SW |
1638 | INIT_LIST_HEAD(&req->r_wait); |
1639 | init_completion(&req->r_completion); | |
1640 | init_completion(&req->r_safe_completion); | |
1641 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1642 | ||
b8e69066 SW |
1643 | req->r_stamp = CURRENT_TIME; |
1644 | ||
2f2dc053 SW |
1645 | req->r_op = op; |
1646 | req->r_direct_mode = mode; | |
1647 | return req; | |
1648 | } | |
1649 | ||
1650 | /* | |
44ca18f2 | 1651 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1652 | * |
1653 | * called under mdsc->mutex. | |
1654 | */ | |
44ca18f2 SW |
1655 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1656 | { | |
1657 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1658 | return NULL; | |
1659 | return rb_entry(rb_first(&mdsc->request_tree), | |
1660 | struct ceph_mds_request, r_node); | |
1661 | } | |
1662 | ||
2f2dc053 SW |
1663 | static u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
1664 | { | |
44ca18f2 SW |
1665 | struct ceph_mds_request *req = __get_oldest_req(mdsc); |
1666 | ||
1667 | if (req) | |
1668 | return req->r_tid; | |
1669 | return 0; | |
2f2dc053 SW |
1670 | } |
1671 | ||
1672 | /* | |
1673 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1674 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1675 | * | |
1676 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1677 | * inode. | |
1678 | * | |
1679 | * Encode hidden .snap dirs as a double /, i.e. | |
1680 | * foo/.snap/bar -> foo//bar | |
1681 | */ | |
1682 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1683 | int stop_on_nosnap) | |
1684 | { | |
1685 | struct dentry *temp; | |
1686 | char *path; | |
1687 | int len, pos; | |
1b71fe2e | 1688 | unsigned seq; |
2f2dc053 SW |
1689 | |
1690 | if (dentry == NULL) | |
1691 | return ERR_PTR(-EINVAL); | |
1692 | ||
1693 | retry: | |
1694 | len = 0; | |
1b71fe2e AV |
1695 | seq = read_seqbegin(&rename_lock); |
1696 | rcu_read_lock(); | |
2f2dc053 SW |
1697 | for (temp = dentry; !IS_ROOT(temp);) { |
1698 | struct inode *inode = temp->d_inode; | |
1699 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) | |
1700 | len++; /* slash only */ | |
1701 | else if (stop_on_nosnap && inode && | |
1702 | ceph_snap(inode) == CEPH_NOSNAP) | |
1703 | break; | |
1704 | else | |
1705 | len += 1 + temp->d_name.len; | |
1706 | temp = temp->d_parent; | |
2f2dc053 | 1707 | } |
1b71fe2e | 1708 | rcu_read_unlock(); |
2f2dc053 SW |
1709 | if (len) |
1710 | len--; /* no leading '/' */ | |
1711 | ||
1712 | path = kmalloc(len+1, GFP_NOFS); | |
1713 | if (path == NULL) | |
1714 | return ERR_PTR(-ENOMEM); | |
1715 | pos = len; | |
1716 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1717 | rcu_read_lock(); |
2f2dc053 | 1718 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1719 | struct inode *inode; |
2f2dc053 | 1720 | |
1b71fe2e AV |
1721 | spin_lock(&temp->d_lock); |
1722 | inode = temp->d_inode; | |
2f2dc053 | 1723 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1724 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1725 | pos, temp); |
1726 | } else if (stop_on_nosnap && inode && | |
1727 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1728 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1729 | break; |
1730 | } else { | |
1731 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1732 | if (pos < 0) { |
1733 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1734 | break; |
1b71fe2e | 1735 | } |
2f2dc053 SW |
1736 | strncpy(path + pos, temp->d_name.name, |
1737 | temp->d_name.len); | |
2f2dc053 | 1738 | } |
1b71fe2e | 1739 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1740 | if (pos) |
1741 | path[--pos] = '/'; | |
1742 | temp = temp->d_parent; | |
2f2dc053 | 1743 | } |
1b71fe2e AV |
1744 | rcu_read_unlock(); |
1745 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1746 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1747 | "expected, namelen is %d, pos is %d\n", len, pos); |
1748 | /* presumably this is only possible if racing with a | |
1749 | rename of one of the parent directories (we can not | |
1750 | lock the dentries above us to prevent this, but | |
1751 | retrying should be harmless) */ | |
1752 | kfree(path); | |
1753 | goto retry; | |
1754 | } | |
1755 | ||
1756 | *base = ceph_ino(temp->d_inode); | |
1757 | *plen = len; | |
104648ad | 1758 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1759 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1760 | return path; |
1761 | } | |
1762 | ||
1763 | static int build_dentry_path(struct dentry *dentry, | |
1764 | const char **ppath, int *ppathlen, u64 *pino, | |
1765 | int *pfreepath) | |
1766 | { | |
1767 | char *path; | |
1768 | ||
1769 | if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) { | |
1770 | *pino = ceph_ino(dentry->d_parent->d_inode); | |
1771 | *ppath = dentry->d_name.name; | |
1772 | *ppathlen = dentry->d_name.len; | |
1773 | return 0; | |
1774 | } | |
1775 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1776 | if (IS_ERR(path)) | |
1777 | return PTR_ERR(path); | |
1778 | *ppath = path; | |
1779 | *pfreepath = 1; | |
1780 | return 0; | |
1781 | } | |
1782 | ||
1783 | static int build_inode_path(struct inode *inode, | |
1784 | const char **ppath, int *ppathlen, u64 *pino, | |
1785 | int *pfreepath) | |
1786 | { | |
1787 | struct dentry *dentry; | |
1788 | char *path; | |
1789 | ||
1790 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1791 | *pino = ceph_ino(inode); | |
1792 | *ppathlen = 0; | |
1793 | return 0; | |
1794 | } | |
1795 | dentry = d_find_alias(inode); | |
1796 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1797 | dput(dentry); | |
1798 | if (IS_ERR(path)) | |
1799 | return PTR_ERR(path); | |
1800 | *ppath = path; | |
1801 | *pfreepath = 1; | |
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | /* | |
1806 | * request arguments may be specified via an inode *, a dentry *, or | |
1807 | * an explicit ino+path. | |
1808 | */ | |
1809 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
1810 | const char *rpath, u64 rino, | |
1811 | const char **ppath, int *pathlen, | |
1812 | u64 *ino, int *freepath) | |
1813 | { | |
1814 | int r = 0; | |
1815 | ||
1816 | if (rinode) { | |
1817 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1818 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1819 | ceph_snap(rinode)); | |
1820 | } else if (rdentry) { | |
1821 | r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath); | |
1822 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, | |
1823 | *ppath); | |
795858db | 1824 | } else if (rpath || rino) { |
2f2dc053 SW |
1825 | *ino = rino; |
1826 | *ppath = rpath; | |
b000056a | 1827 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1828 | dout(" path %.*s\n", *pathlen, rpath); |
1829 | } | |
1830 | ||
1831 | return r; | |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * called under mdsc->mutex | |
1836 | */ | |
1837 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1838 | struct ceph_mds_request *req, | |
1839 | int mds) | |
1840 | { | |
1841 | struct ceph_msg *msg; | |
1842 | struct ceph_mds_request_head *head; | |
1843 | const char *path1 = NULL; | |
1844 | const char *path2 = NULL; | |
1845 | u64 ino1 = 0, ino2 = 0; | |
1846 | int pathlen1 = 0, pathlen2 = 0; | |
1847 | int freepath1 = 0, freepath2 = 0; | |
1848 | int len; | |
1849 | u16 releases; | |
1850 | void *p, *end; | |
1851 | int ret; | |
1852 | ||
1853 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
1854 | req->r_path1, req->r_ino1.ino, | |
1855 | &path1, &pathlen1, &ino1, &freepath1); | |
1856 | if (ret < 0) { | |
1857 | msg = ERR_PTR(ret); | |
1858 | goto out; | |
1859 | } | |
1860 | ||
1861 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
1862 | req->r_path2, req->r_ino2.ino, | |
1863 | &path2, &pathlen2, &ino2, &freepath2); | |
1864 | if (ret < 0) { | |
1865 | msg = ERR_PTR(ret); | |
1866 | goto out_free1; | |
1867 | } | |
1868 | ||
1869 | len = sizeof(*head) + | |
b8e69066 SW |
1870 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
1871 | sizeof(struct timespec); | |
2f2dc053 SW |
1872 | |
1873 | /* calculate (max) length for cap releases */ | |
1874 | len += sizeof(struct ceph_mds_request_release) * | |
1875 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
1876 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
1877 | if (req->r_dentry_drop) | |
1878 | len += req->r_dentry->d_name.len; | |
1879 | if (req->r_old_dentry_drop) | |
1880 | len += req->r_old_dentry->d_name.len; | |
1881 | ||
b61c2763 | 1882 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
1883 | if (!msg) { |
1884 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 1885 | goto out_free2; |
a79832f2 | 1886 | } |
2f2dc053 | 1887 | |
7cfa0313 | 1888 | msg->hdr.version = cpu_to_le16(2); |
6df058c0 SW |
1889 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
1890 | ||
2f2dc053 SW |
1891 | head = msg->front.iov_base; |
1892 | p = msg->front.iov_base + sizeof(*head); | |
1893 | end = msg->front.iov_base + msg->front.iov_len; | |
1894 | ||
1895 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
1896 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
1897 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
1898 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
1899 | head->args = req->r_args; |
1900 | ||
1901 | ceph_encode_filepath(&p, end, ino1, path1); | |
1902 | ceph_encode_filepath(&p, end, ino2, path2); | |
1903 | ||
e979cf50 SW |
1904 | /* make note of release offset, in case we need to replay */ |
1905 | req->r_request_release_offset = p - msg->front.iov_base; | |
1906 | ||
2f2dc053 SW |
1907 | /* cap releases */ |
1908 | releases = 0; | |
1909 | if (req->r_inode_drop) | |
1910 | releases += ceph_encode_inode_release(&p, | |
1911 | req->r_inode ? req->r_inode : req->r_dentry->d_inode, | |
1912 | mds, req->r_inode_drop, req->r_inode_unless, 0); | |
1913 | if (req->r_dentry_drop) | |
1914 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
1915 | mds, req->r_dentry_drop, req->r_dentry_unless); | |
1916 | if (req->r_old_dentry_drop) | |
1917 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
1918 | mds, req->r_old_dentry_drop, req->r_old_dentry_unless); | |
1919 | if (req->r_old_inode_drop) | |
1920 | releases += ceph_encode_inode_release(&p, | |
1921 | req->r_old_dentry->d_inode, | |
1922 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); | |
1923 | head->num_releases = cpu_to_le16(releases); | |
1924 | ||
b8e69066 SW |
1925 | /* time stamp */ |
1926 | ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp)); | |
1927 | ||
2f2dc053 SW |
1928 | BUG_ON(p > end); |
1929 | msg->front.iov_len = p - msg->front.iov_base; | |
1930 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1931 | ||
25e6bae3 YZ |
1932 | if (req->r_pagelist) { |
1933 | struct ceph_pagelist *pagelist = req->r_pagelist; | |
1934 | atomic_inc(&pagelist->refcnt); | |
1935 | ceph_msg_data_add_pagelist(msg, pagelist); | |
1936 | msg->hdr.data_len = cpu_to_le32(pagelist->length); | |
1937 | } else { | |
1938 | msg->hdr.data_len = 0; | |
ebf18f47 | 1939 | } |
02afca6c | 1940 | |
2f2dc053 SW |
1941 | msg->hdr.data_off = cpu_to_le16(0); |
1942 | ||
1943 | out_free2: | |
1944 | if (freepath2) | |
1945 | kfree((char *)path2); | |
1946 | out_free1: | |
1947 | if (freepath1) | |
1948 | kfree((char *)path1); | |
1949 | out: | |
1950 | return msg; | |
1951 | } | |
1952 | ||
1953 | /* | |
1954 | * called under mdsc->mutex if error, under no mutex if | |
1955 | * success. | |
1956 | */ | |
1957 | static void complete_request(struct ceph_mds_client *mdsc, | |
1958 | struct ceph_mds_request *req) | |
1959 | { | |
1960 | if (req->r_callback) | |
1961 | req->r_callback(mdsc, req); | |
1962 | else | |
03066f23 | 1963 | complete_all(&req->r_completion); |
2f2dc053 SW |
1964 | } |
1965 | ||
1966 | /* | |
1967 | * called under mdsc->mutex | |
1968 | */ | |
1969 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
1970 | struct ceph_mds_request *req, | |
1971 | int mds) | |
1972 | { | |
1973 | struct ceph_mds_request_head *rhead; | |
1974 | struct ceph_msg *msg; | |
1975 | int flags = 0; | |
1976 | ||
2f2dc053 | 1977 | req->r_attempts++; |
e55b71f8 GF |
1978 | if (req->r_inode) { |
1979 | struct ceph_cap *cap = | |
1980 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
1981 | ||
1982 | if (cap) | |
1983 | req->r_sent_on_mseq = cap->mseq; | |
1984 | else | |
1985 | req->r_sent_on_mseq = -1; | |
1986 | } | |
2f2dc053 SW |
1987 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
1988 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
1989 | ||
01a92f17 | 1990 | if (req->r_got_unsafe) { |
c5c9a0bf | 1991 | void *p; |
01a92f17 SW |
1992 | /* |
1993 | * Replay. Do not regenerate message (and rebuild | |
1994 | * paths, etc.); just use the original message. | |
1995 | * Rebuilding paths will break for renames because | |
1996 | * d_move mangles the src name. | |
1997 | */ | |
1998 | msg = req->r_request; | |
1999 | rhead = msg->front.iov_base; | |
2000 | ||
2001 | flags = le32_to_cpu(rhead->flags); | |
2002 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2003 | rhead->flags = cpu_to_le32(flags); | |
2004 | ||
2005 | if (req->r_target_inode) | |
2006 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
2007 | ||
2008 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
2009 | |
2010 | /* remove cap/dentry releases from message */ | |
2011 | rhead->num_releases = 0; | |
c5c9a0bf YZ |
2012 | |
2013 | /* time stamp */ | |
2014 | p = msg->front.iov_base + req->r_request_release_offset; | |
2015 | ceph_encode_copy(&p, &req->r_stamp, sizeof(req->r_stamp)); | |
2016 | ||
2017 | msg->front.iov_len = p - msg->front.iov_base; | |
2018 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
01a92f17 SW |
2019 | return 0; |
2020 | } | |
2021 | ||
2f2dc053 SW |
2022 | if (req->r_request) { |
2023 | ceph_msg_put(req->r_request); | |
2024 | req->r_request = NULL; | |
2025 | } | |
2026 | msg = create_request_message(mdsc, req, mds); | |
2027 | if (IS_ERR(msg)) { | |
e1518c7c | 2028 | req->r_err = PTR_ERR(msg); |
2f2dc053 | 2029 | complete_request(mdsc, req); |
a79832f2 | 2030 | return PTR_ERR(msg); |
2f2dc053 SW |
2031 | } |
2032 | req->r_request = msg; | |
2033 | ||
2034 | rhead = msg->front.iov_base; | |
2f2dc053 SW |
2035 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
2036 | if (req->r_got_unsafe) | |
2037 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2038 | if (req->r_locked_dir) | |
2039 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; | |
2040 | rhead->flags = cpu_to_le32(flags); | |
2041 | rhead->num_fwd = req->r_num_fwd; | |
2042 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 2043 | rhead->ino = 0; |
2f2dc053 SW |
2044 | |
2045 | dout(" r_locked_dir = %p\n", req->r_locked_dir); | |
2f2dc053 SW |
2046 | return 0; |
2047 | } | |
2048 | ||
2049 | /* | |
2050 | * send request, or put it on the appropriate wait list. | |
2051 | */ | |
2052 | static int __do_request(struct ceph_mds_client *mdsc, | |
2053 | struct ceph_mds_request *req) | |
2054 | { | |
2055 | struct ceph_mds_session *session = NULL; | |
2056 | int mds = -1; | |
2057 | int err = -EAGAIN; | |
2058 | ||
eb1b8af3 YZ |
2059 | if (req->r_err || req->r_got_result) { |
2060 | if (req->r_aborted) | |
2061 | __unregister_request(mdsc, req); | |
2f2dc053 | 2062 | goto out; |
eb1b8af3 | 2063 | } |
2f2dc053 SW |
2064 | |
2065 | if (req->r_timeout && | |
2066 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
2067 | dout("do_request timed out\n"); | |
2068 | err = -EIO; | |
2069 | goto finish; | |
2070 | } | |
2071 | ||
dc69e2e9 SW |
2072 | put_request_session(req); |
2073 | ||
2f2dc053 SW |
2074 | mds = __choose_mds(mdsc, req); |
2075 | if (mds < 0 || | |
2076 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
2077 | dout("do_request no mds or not active, waiting for map\n"); | |
2078 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2079 | goto out; | |
2080 | } | |
2081 | ||
2082 | /* get, open session */ | |
2083 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 2084 | if (!session) { |
2f2dc053 | 2085 | session = register_session(mdsc, mds); |
9c423956 SW |
2086 | if (IS_ERR(session)) { |
2087 | err = PTR_ERR(session); | |
2088 | goto finish; | |
2089 | } | |
2090 | } | |
dc69e2e9 SW |
2091 | req->r_session = get_session(session); |
2092 | ||
2f2dc053 | 2093 | dout("do_request mds%d session %p state %s\n", mds, session, |
a687ecaf | 2094 | ceph_session_state_name(session->s_state)); |
2f2dc053 SW |
2095 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
2096 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
2097 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
2098 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
2099 | __open_session(mdsc, session); | |
2100 | list_add(&req->r_wait, &session->s_waiting); | |
2101 | goto out_session; | |
2102 | } | |
2103 | ||
2104 | /* send request */ | |
2f2dc053 SW |
2105 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2106 | ||
2107 | if (req->r_request_started == 0) /* note request start time */ | |
2108 | req->r_request_started = jiffies; | |
2109 | ||
2110 | err = __prepare_send_request(mdsc, req, mds); | |
2111 | if (!err) { | |
2112 | ceph_msg_get(req->r_request); | |
2113 | ceph_con_send(&session->s_con, req->r_request); | |
2114 | } | |
2115 | ||
2116 | out_session: | |
2117 | ceph_put_mds_session(session); | |
2118 | out: | |
2119 | return err; | |
2120 | ||
2121 | finish: | |
e1518c7c | 2122 | req->r_err = err; |
2f2dc053 SW |
2123 | complete_request(mdsc, req); |
2124 | goto out; | |
2125 | } | |
2126 | ||
2127 | /* | |
2128 | * called under mdsc->mutex | |
2129 | */ | |
2130 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
2131 | struct list_head *head) | |
2132 | { | |
ed75ec2c YZ |
2133 | struct ceph_mds_request *req; |
2134 | LIST_HEAD(tmp_list); | |
2135 | ||
2136 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 2137 | |
ed75ec2c YZ |
2138 | while (!list_empty(&tmp_list)) { |
2139 | req = list_entry(tmp_list.next, | |
2140 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2141 | list_del_init(&req->r_wait); |
7971bd92 | 2142 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2143 | __do_request(mdsc, req); |
2144 | } | |
2145 | } | |
2146 | ||
2147 | /* | |
2148 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2149 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2150 | */ |
29790f26 | 2151 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2152 | { |
44ca18f2 | 2153 | struct ceph_mds_request *req; |
282c1052 | 2154 | struct rb_node *p = rb_first(&mdsc->request_tree); |
2f2dc053 SW |
2155 | |
2156 | dout("kick_requests mds%d\n", mds); | |
282c1052 | 2157 | while (p) { |
44ca18f2 | 2158 | req = rb_entry(p, struct ceph_mds_request, r_node); |
282c1052 | 2159 | p = rb_next(p); |
44ca18f2 SW |
2160 | if (req->r_got_unsafe) |
2161 | continue; | |
2162 | if (req->r_session && | |
2163 | req->r_session->s_mds == mds) { | |
2164 | dout(" kicking tid %llu\n", req->r_tid); | |
03974e81 | 2165 | list_del_init(&req->r_wait); |
44ca18f2 | 2166 | __do_request(mdsc, req); |
2f2dc053 SW |
2167 | } |
2168 | } | |
2169 | } | |
2170 | ||
2171 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2172 | struct ceph_mds_request *req) | |
2173 | { | |
2174 | dout("submit_request on %p\n", req); | |
2175 | mutex_lock(&mdsc->mutex); | |
2176 | __register_request(mdsc, req, NULL); | |
2177 | __do_request(mdsc, req); | |
2178 | mutex_unlock(&mdsc->mutex); | |
2179 | } | |
2180 | ||
2181 | /* | |
2182 | * Synchrously perform an mds request. Take care of all of the | |
2183 | * session setup, forwarding, retry details. | |
2184 | */ | |
2185 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2186 | struct inode *dir, | |
2187 | struct ceph_mds_request *req) | |
2188 | { | |
2189 | int err; | |
2190 | ||
2191 | dout("do_request on %p\n", req); | |
2192 | ||
2193 | /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */ | |
2194 | if (req->r_inode) | |
2195 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
2196 | if (req->r_locked_dir) | |
2197 | ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN); | |
844d87c3 | 2198 | if (req->r_old_dentry_dir) |
41b02e1f SW |
2199 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2200 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2201 | |
2202 | /* issue */ | |
2203 | mutex_lock(&mdsc->mutex); | |
2204 | __register_request(mdsc, req, dir); | |
2205 | __do_request(mdsc, req); | |
2206 | ||
e1518c7c SW |
2207 | if (req->r_err) { |
2208 | err = req->r_err; | |
2209 | __unregister_request(mdsc, req); | |
2210 | dout("do_request early error %d\n", err); | |
2211 | goto out; | |
2f2dc053 SW |
2212 | } |
2213 | ||
e1518c7c SW |
2214 | /* wait */ |
2215 | mutex_unlock(&mdsc->mutex); | |
2216 | dout("do_request waiting\n"); | |
2217 | if (req->r_timeout) { | |
aa91647c | 2218 | err = (long)wait_for_completion_killable_timeout( |
e1518c7c SW |
2219 | &req->r_completion, req->r_timeout); |
2220 | if (err == 0) | |
2221 | err = -EIO; | |
9280be24 YZ |
2222 | } else if (req->r_wait_for_completion) { |
2223 | err = req->r_wait_for_completion(mdsc, req); | |
e1518c7c | 2224 | } else { |
aa91647c | 2225 | err = wait_for_completion_killable(&req->r_completion); |
e1518c7c SW |
2226 | } |
2227 | dout("do_request waited, got %d\n", err); | |
2228 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2229 | |
e1518c7c SW |
2230 | /* only abort if we didn't race with a real reply */ |
2231 | if (req->r_got_result) { | |
2232 | err = le32_to_cpu(req->r_reply_info.head->result); | |
2233 | } else if (err < 0) { | |
2234 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2235 | |
2236 | /* | |
2237 | * ensure we aren't running concurrently with | |
2238 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2239 | * rely on locks (dir mutex) held by our caller. | |
2240 | */ | |
2241 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c SW |
2242 | req->r_err = err; |
2243 | req->r_aborted = true; | |
b4556396 | 2244 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2245 | |
e1518c7c | 2246 | if (req->r_locked_dir && |
167c9e35 SW |
2247 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2248 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2249 | } else { |
e1518c7c | 2250 | err = req->r_err; |
2f2dc053 | 2251 | } |
2f2dc053 | 2252 | |
e1518c7c SW |
2253 | out: |
2254 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2255 | dout("do_request %p done, result %d\n", req, err); |
2256 | return err; | |
2257 | } | |
2258 | ||
167c9e35 | 2259 | /* |
2f276c51 | 2260 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2261 | * namespace request. |
2262 | */ | |
2263 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2264 | { | |
2265 | struct inode *inode = req->r_locked_dir; | |
167c9e35 | 2266 | |
2f276c51 | 2267 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2268 | |
2f276c51 | 2269 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2270 | if (req->r_dentry) |
2271 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2272 | if (req->r_old_dentry) | |
2273 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2274 | } | |
2275 | ||
2f2dc053 SW |
2276 | /* |
2277 | * Handle mds reply. | |
2278 | * | |
2279 | * We take the session mutex and parse and process the reply immediately. | |
2280 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2281 | * by the MDS as they are applied to our local cache. | |
2282 | */ | |
2283 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2284 | { | |
2285 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2286 | struct ceph_mds_request *req; | |
2287 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2288 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
2289 | u64 tid; | |
2290 | int err, result; | |
2600d2dd | 2291 | int mds = session->s_mds; |
2f2dc053 | 2292 | |
2f2dc053 SW |
2293 | if (msg->front.iov_len < sizeof(*head)) { |
2294 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2295 | ceph_msg_dump(msg); |
2f2dc053 SW |
2296 | return; |
2297 | } | |
2298 | ||
2299 | /* get request, session */ | |
6df058c0 | 2300 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2301 | mutex_lock(&mdsc->mutex); |
2302 | req = __lookup_request(mdsc, tid); | |
2303 | if (!req) { | |
2304 | dout("handle_reply on unknown tid %llu\n", tid); | |
2305 | mutex_unlock(&mdsc->mutex); | |
2306 | return; | |
2307 | } | |
2308 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2309 | |
2310 | /* correct session? */ | |
d96d6049 | 2311 | if (req->r_session != session) { |
2f2dc053 SW |
2312 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2313 | " not mds%d\n", tid, session->s_mds, | |
2314 | req->r_session ? req->r_session->s_mds : -1); | |
2315 | mutex_unlock(&mdsc->mutex); | |
2316 | goto out; | |
2317 | } | |
2318 | ||
2319 | /* dup? */ | |
2320 | if ((req->r_got_unsafe && !head->safe) || | |
2321 | (req->r_got_safe && head->safe)) { | |
f3ae1b97 | 2322 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
2323 | head->safe ? "safe" : "unsafe", tid, mds); |
2324 | mutex_unlock(&mdsc->mutex); | |
2325 | goto out; | |
2326 | } | |
85792d0d | 2327 | if (req->r_got_safe && !head->safe) { |
f3ae1b97 | 2328 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
2329 | tid, mds); |
2330 | mutex_unlock(&mdsc->mutex); | |
2331 | goto out; | |
2332 | } | |
2f2dc053 SW |
2333 | |
2334 | result = le32_to_cpu(head->result); | |
2335 | ||
2336 | /* | |
e55b71f8 GF |
2337 | * Handle an ESTALE |
2338 | * if we're not talking to the authority, send to them | |
2339 | * if the authority has changed while we weren't looking, | |
2340 | * send to new authority | |
2341 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2342 | */ |
2343 | if (result == -ESTALE) { | |
e55b71f8 | 2344 | dout("got ESTALE on request %llu", req->r_tid); |
51da8e8c | 2345 | req->r_resend_mds = -1; |
ca18bede | 2346 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2347 | dout("not using auth, setting for that now"); |
2348 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2349 | __do_request(mdsc, req); |
2350 | mutex_unlock(&mdsc->mutex); | |
2351 | goto out; | |
e55b71f8 | 2352 | } else { |
ca18bede YZ |
2353 | int mds = __choose_mds(mdsc, req); |
2354 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2355 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2356 | __do_request(mdsc, req); |
2357 | mutex_unlock(&mdsc->mutex); | |
2358 | goto out; | |
2359 | } | |
2f2dc053 | 2360 | } |
e55b71f8 | 2361 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2362 | } |
2363 | ||
e55b71f8 | 2364 | |
2f2dc053 SW |
2365 | if (head->safe) { |
2366 | req->r_got_safe = true; | |
2367 | __unregister_request(mdsc, req); | |
2f2dc053 SW |
2368 | |
2369 | if (req->r_got_unsafe) { | |
2370 | /* | |
2371 | * We already handled the unsafe response, now do the | |
2372 | * cleanup. No need to examine the response; the MDS | |
2373 | * doesn't include any result info in the safe | |
2374 | * response. And even if it did, there is nothing | |
2375 | * useful we could do with a revised return value. | |
2376 | */ | |
2377 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2378 | list_del_init(&req->r_unsafe_item); | |
2379 | ||
2380 | /* last unsafe request during umount? */ | |
44ca18f2 | 2381 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2382 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2383 | mutex_unlock(&mdsc->mutex); |
2384 | goto out; | |
2385 | } | |
e1518c7c | 2386 | } else { |
2f2dc053 SW |
2387 | req->r_got_unsafe = true; |
2388 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); | |
2389 | } | |
2390 | ||
2391 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2392 | rinfo = &req->r_reply_info; | |
14303d20 | 2393 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2394 | mutex_unlock(&mdsc->mutex); |
2395 | ||
2396 | mutex_lock(&session->s_mutex); | |
2397 | if (err < 0) { | |
25933abd | 2398 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2399 | ceph_msg_dump(msg); |
2f2dc053 SW |
2400 | goto out_err; |
2401 | } | |
2402 | ||
2403 | /* snap trace */ | |
2404 | if (rinfo->snapblob_len) { | |
2405 | down_write(&mdsc->snap_rwsem); | |
2406 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
2407 | rinfo->snapblob + rinfo->snapblob_len, | |
2408 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP); | |
2409 | downgrade_write(&mdsc->snap_rwsem); | |
2410 | } else { | |
2411 | down_read(&mdsc->snap_rwsem); | |
2412 | } | |
2413 | ||
2414 | /* insert trace into our cache */ | |
b4556396 | 2415 | mutex_lock(&req->r_fill_mutex); |
3d14c5d2 | 2416 | err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session); |
2f2dc053 | 2417 | if (err == 0) { |
6e8575fa | 2418 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2419 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2420 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2421 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2422 | } |
b4556396 | 2423 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2424 | |
2425 | up_read(&mdsc->snap_rwsem); | |
2426 | out_err: | |
e1518c7c SW |
2427 | mutex_lock(&mdsc->mutex); |
2428 | if (!req->r_aborted) { | |
2429 | if (err) { | |
2430 | req->r_err = err; | |
2431 | } else { | |
2432 | req->r_reply = msg; | |
2433 | ceph_msg_get(msg); | |
2434 | req->r_got_result = true; | |
2435 | } | |
2f2dc053 | 2436 | } else { |
e1518c7c | 2437 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2438 | } |
e1518c7c | 2439 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2440 | |
ee6b272b | 2441 | ceph_add_cap_releases(mdsc, req->r_session); |
2f2dc053 SW |
2442 | mutex_unlock(&session->s_mutex); |
2443 | ||
2444 | /* kick calling process */ | |
2445 | complete_request(mdsc, req); | |
2446 | out: | |
2447 | ceph_mdsc_put_request(req); | |
2448 | return; | |
2449 | } | |
2450 | ||
2451 | ||
2452 | ||
2453 | /* | |
2454 | * handle mds notification that our request has been forwarded. | |
2455 | */ | |
2600d2dd SW |
2456 | static void handle_forward(struct ceph_mds_client *mdsc, |
2457 | struct ceph_mds_session *session, | |
2458 | struct ceph_msg *msg) | |
2f2dc053 SW |
2459 | { |
2460 | struct ceph_mds_request *req; | |
a1ea787c | 2461 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2462 | u32 next_mds; |
2463 | u32 fwd_seq; | |
2f2dc053 SW |
2464 | int err = -EINVAL; |
2465 | void *p = msg->front.iov_base; | |
2466 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2467 | |
a1ea787c | 2468 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2469 | next_mds = ceph_decode_32(&p); |
2470 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2471 | |
2472 | mutex_lock(&mdsc->mutex); | |
2473 | req = __lookup_request(mdsc, tid); | |
2474 | if (!req) { | |
2a8e5e36 | 2475 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2476 | goto out; /* dup reply? */ |
2477 | } | |
2478 | ||
2a8e5e36 SW |
2479 | if (req->r_aborted) { |
2480 | dout("forward tid %llu aborted, unregistering\n", tid); | |
2481 | __unregister_request(mdsc, req); | |
2482 | } else if (fwd_seq <= req->r_num_fwd) { | |
2483 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2484 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2485 | } else { | |
2486 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2487 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2488 | BUG_ON(req->r_err); | |
2489 | BUG_ON(req->r_got_result); | |
2f2dc053 SW |
2490 | req->r_num_fwd = fwd_seq; |
2491 | req->r_resend_mds = next_mds; | |
2492 | put_request_session(req); | |
2493 | __do_request(mdsc, req); | |
2494 | } | |
2495 | ceph_mdsc_put_request(req); | |
2496 | out: | |
2497 | mutex_unlock(&mdsc->mutex); | |
2498 | return; | |
2499 | ||
2500 | bad: | |
2501 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2502 | } | |
2503 | ||
2504 | /* | |
2505 | * handle a mds session control message | |
2506 | */ | |
2507 | static void handle_session(struct ceph_mds_session *session, | |
2508 | struct ceph_msg *msg) | |
2509 | { | |
2510 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2511 | u32 op; | |
2512 | u64 seq; | |
2600d2dd | 2513 | int mds = session->s_mds; |
2f2dc053 SW |
2514 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2515 | int wake = 0; | |
2516 | ||
2f2dc053 SW |
2517 | /* decode */ |
2518 | if (msg->front.iov_len != sizeof(*h)) | |
2519 | goto bad; | |
2520 | op = le32_to_cpu(h->op); | |
2521 | seq = le64_to_cpu(h->seq); | |
2522 | ||
2523 | mutex_lock(&mdsc->mutex); | |
2600d2dd SW |
2524 | if (op == CEPH_SESSION_CLOSE) |
2525 | __unregister_session(mdsc, session); | |
2f2dc053 SW |
2526 | /* FIXME: this ttl calculation is generous */ |
2527 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2528 | mutex_unlock(&mdsc->mutex); | |
2529 | ||
2530 | mutex_lock(&session->s_mutex); | |
2531 | ||
2532 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2533 | mds, ceph_session_op_name(op), session, | |
a687ecaf | 2534 | ceph_session_state_name(session->s_state), seq); |
2f2dc053 SW |
2535 | |
2536 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2537 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2538 | pr_info("mds%d came back\n", session->s_mds); | |
2539 | } | |
2540 | ||
2541 | switch (op) { | |
2542 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2543 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2544 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2545 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2546 | renewed_caps(mdsc, session, 0); | |
2547 | wake = 1; | |
2548 | if (mdsc->stopping) | |
2549 | __close_session(mdsc, session); | |
2550 | break; | |
2551 | ||
2552 | case CEPH_SESSION_RENEWCAPS: | |
2553 | if (session->s_renew_seq == seq) | |
2554 | renewed_caps(mdsc, session, 1); | |
2555 | break; | |
2556 | ||
2557 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2558 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2559 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
2f2dc053 | 2560 | remove_session_caps(session); |
656e4382 | 2561 | wake = 2; /* for good measure */ |
f3c60c59 | 2562 | wake_up_all(&mdsc->session_close_wq); |
2f2dc053 SW |
2563 | break; |
2564 | ||
2565 | case CEPH_SESSION_STALE: | |
2566 | pr_info("mds%d caps went stale, renewing\n", | |
2567 | session->s_mds); | |
d8fb02ab | 2568 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2569 | session->s_cap_gen++; |
1ce208a6 | 2570 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2571 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2572 | send_renew_caps(mdsc, session); |
2573 | break; | |
2574 | ||
2575 | case CEPH_SESSION_RECALL_STATE: | |
2576 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2577 | break; | |
2578 | ||
186e4f7a YZ |
2579 | case CEPH_SESSION_FLUSHMSG: |
2580 | send_flushmsg_ack(mdsc, session, seq); | |
2581 | break; | |
2582 | ||
2f2dc053 SW |
2583 | default: |
2584 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2585 | WARN_ON(1); | |
2586 | } | |
2587 | ||
2588 | mutex_unlock(&session->s_mutex); | |
2589 | if (wake) { | |
2590 | mutex_lock(&mdsc->mutex); | |
2591 | __wake_requests(mdsc, &session->s_waiting); | |
656e4382 YZ |
2592 | if (wake == 2) |
2593 | kick_requests(mdsc, mds); | |
2f2dc053 SW |
2594 | mutex_unlock(&mdsc->mutex); |
2595 | } | |
2596 | return; | |
2597 | ||
2598 | bad: | |
2599 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2600 | (int)msg->front.iov_len); | |
9ec7cab1 | 2601 | ceph_msg_dump(msg); |
2f2dc053 SW |
2602 | return; |
2603 | } | |
2604 | ||
2605 | ||
2606 | /* | |
2607 | * called under session->mutex. | |
2608 | */ | |
2609 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2610 | struct ceph_mds_session *session) | |
2611 | { | |
2612 | struct ceph_mds_request *req, *nreq; | |
2613 | int err; | |
2614 | ||
2615 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2616 | ||
2617 | mutex_lock(&mdsc->mutex); | |
2618 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
2619 | err = __prepare_send_request(mdsc, req, session->s_mds); | |
2620 | if (!err) { | |
2621 | ceph_msg_get(req->r_request); | |
2622 | ceph_con_send(&session->s_con, req->r_request); | |
2623 | } | |
2624 | } | |
2625 | mutex_unlock(&mdsc->mutex); | |
2626 | } | |
2627 | ||
2628 | /* | |
2629 | * Encode information about a cap for a reconnect with the MDS. | |
2630 | */ | |
2f2dc053 SW |
2631 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2632 | void *arg) | |
2633 | { | |
20cb34ae SW |
2634 | union { |
2635 | struct ceph_mds_cap_reconnect v2; | |
2636 | struct ceph_mds_cap_reconnect_v1 v1; | |
2637 | } rec; | |
2638 | size_t reclen; | |
2f2dc053 | 2639 | struct ceph_inode_info *ci; |
20cb34ae SW |
2640 | struct ceph_reconnect_state *recon_state = arg; |
2641 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2642 | char *path; |
2643 | int pathlen, err; | |
2644 | u64 pathbase; | |
2645 | struct dentry *dentry; | |
2646 | ||
2647 | ci = cap->ci; | |
2648 | ||
2649 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", | |
2650 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2651 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2652 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2653 | if (err) | |
2654 | return err; | |
2f2dc053 SW |
2655 | |
2656 | dentry = d_find_alias(inode); | |
2657 | if (dentry) { | |
2658 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2659 | if (IS_ERR(path)) { | |
2660 | err = PTR_ERR(path); | |
e072f8aa | 2661 | goto out_dput; |
2f2dc053 SW |
2662 | } |
2663 | } else { | |
2664 | path = NULL; | |
2665 | pathlen = 0; | |
2666 | } | |
93cea5be SW |
2667 | err = ceph_pagelist_encode_string(pagelist, path, pathlen); |
2668 | if (err) | |
e072f8aa | 2669 | goto out_free; |
2f2dc053 | 2670 | |
be655596 | 2671 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2672 | cap->seq = 0; /* reset cap seq */ |
2673 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2674 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2675 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae SW |
2676 | |
2677 | if (recon_state->flock) { | |
2678 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); | |
2679 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2680 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2681 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2682 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
2683 | rec.v2.flock_len = 0; | |
2684 | reclen = sizeof(rec.v2); | |
2685 | } else { | |
2686 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2687 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2688 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2689 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2690 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2691 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2692 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2693 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
2694 | reclen = sizeof(rec.v1); | |
2695 | } | |
be655596 | 2696 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2697 | |
40819f6f GF |
2698 | if (recon_state->flock) { |
2699 | int num_fcntl_locks, num_flock_locks; | |
39be95e9 JS |
2700 | struct ceph_filelock *flocks; |
2701 | ||
2702 | encode_again: | |
1c8c601a | 2703 | spin_lock(&inode->i_lock); |
39be95e9 | 2704 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); |
1c8c601a | 2705 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2706 | flocks = kmalloc((num_fcntl_locks+num_flock_locks) * |
2707 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2708 | if (!flocks) { | |
2709 | err = -ENOMEM; | |
2710 | goto out_free; | |
2711 | } | |
1c8c601a | 2712 | spin_lock(&inode->i_lock); |
39be95e9 JS |
2713 | err = ceph_encode_locks_to_buffer(inode, flocks, |
2714 | num_fcntl_locks, | |
2715 | num_flock_locks); | |
1c8c601a | 2716 | spin_unlock(&inode->i_lock); |
39be95e9 JS |
2717 | if (err) { |
2718 | kfree(flocks); | |
2719 | if (err == -ENOSPC) | |
2720 | goto encode_again; | |
2721 | goto out_free; | |
2722 | } | |
2723 | /* | |
2724 | * number of encoded locks is stable, so copy to pagelist | |
2725 | */ | |
2726 | rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) + | |
2727 | (num_fcntl_locks+num_flock_locks) * | |
2728 | sizeof(struct ceph_filelock)); | |
2729 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
2730 | if (!err) | |
2731 | err = ceph_locks_to_pagelist(flocks, pagelist, | |
2732 | num_fcntl_locks, | |
2733 | num_flock_locks); | |
2734 | kfree(flocks); | |
3612abbd SW |
2735 | } else { |
2736 | err = ceph_pagelist_append(pagelist, &rec, reclen); | |
40819f6f | 2737 | } |
44c99757 YZ |
2738 | |
2739 | recon_state->nr_caps++; | |
e072f8aa | 2740 | out_free: |
2f2dc053 | 2741 | kfree(path); |
e072f8aa | 2742 | out_dput: |
2f2dc053 | 2743 | dput(dentry); |
93cea5be | 2744 | return err; |
2f2dc053 SW |
2745 | } |
2746 | ||
2747 | ||
2748 | /* | |
2749 | * If an MDS fails and recovers, clients need to reconnect in order to | |
2750 | * reestablish shared state. This includes all caps issued through | |
2751 | * this session _and_ the snap_realm hierarchy. Because it's not | |
2752 | * clear which snap realms the mds cares about, we send everything we | |
2753 | * know about.. that ensures we'll then get any new info the | |
2754 | * recovering MDS might have. | |
2755 | * | |
2756 | * This is a relatively heavyweight operation, but it's rare. | |
2757 | * | |
2758 | * called with mdsc->mutex held. | |
2759 | */ | |
34b6c855 SW |
2760 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
2761 | struct ceph_mds_session *session) | |
2f2dc053 | 2762 | { |
2f2dc053 | 2763 | struct ceph_msg *reply; |
a105f00c | 2764 | struct rb_node *p; |
34b6c855 | 2765 | int mds = session->s_mds; |
9abf82b8 | 2766 | int err = -ENOMEM; |
44c99757 | 2767 | int s_nr_caps; |
93cea5be | 2768 | struct ceph_pagelist *pagelist; |
20cb34ae | 2769 | struct ceph_reconnect_state recon_state; |
2f2dc053 | 2770 | |
34b6c855 | 2771 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 2772 | |
93cea5be SW |
2773 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
2774 | if (!pagelist) | |
2775 | goto fail_nopagelist; | |
2776 | ceph_pagelist_init(pagelist); | |
2777 | ||
b61c2763 | 2778 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 2779 | if (!reply) |
93cea5be | 2780 | goto fail_nomsg; |
93cea5be | 2781 | |
34b6c855 SW |
2782 | mutex_lock(&session->s_mutex); |
2783 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
2784 | session->s_seq = 0; | |
2f2dc053 | 2785 | |
2f2dc053 | 2786 | dout("session %p state %s\n", session, |
a687ecaf | 2787 | ceph_session_state_name(session->s_state)); |
2f2dc053 | 2788 | |
99a9c273 YZ |
2789 | spin_lock(&session->s_gen_ttl_lock); |
2790 | session->s_cap_gen++; | |
2791 | spin_unlock(&session->s_gen_ttl_lock); | |
2792 | ||
2793 | spin_lock(&session->s_cap_lock); | |
2794 | /* | |
2795 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
2796 | * If a cap get released before being added to the cap reconnect, | |
2797 | * __ceph_remove_cap() should skip queuing cap release. | |
2798 | */ | |
2799 | session->s_cap_reconnect = 1; | |
e01a5946 SW |
2800 | /* drop old cap expires; we're about to reestablish that state */ |
2801 | discard_cap_releases(mdsc, session); | |
99a9c273 | 2802 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 2803 | |
5d23371f YZ |
2804 | /* trim unused caps to reduce MDS's cache rejoin time */ |
2805 | shrink_dcache_parent(mdsc->fsc->sb->s_root); | |
2806 | ||
2807 | ceph_con_close(&session->s_con); | |
2808 | ceph_con_open(&session->s_con, | |
2809 | CEPH_ENTITY_TYPE_MDS, mds, | |
2810 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
2811 | ||
2812 | /* replay unsafe requests */ | |
2813 | replay_unsafe_requests(mdsc, session); | |
2814 | ||
2815 | down_read(&mdsc->snap_rwsem); | |
2816 | ||
2f2dc053 | 2817 | /* traverse this session's caps */ |
44c99757 YZ |
2818 | s_nr_caps = session->s_nr_caps; |
2819 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
2820 | if (err) |
2821 | goto fail; | |
20cb34ae | 2822 | |
44c99757 | 2823 | recon_state.nr_caps = 0; |
20cb34ae SW |
2824 | recon_state.pagelist = pagelist; |
2825 | recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK; | |
2826 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); | |
2f2dc053 | 2827 | if (err < 0) |
9abf82b8 | 2828 | goto fail; |
2f2dc053 | 2829 | |
99a9c273 YZ |
2830 | spin_lock(&session->s_cap_lock); |
2831 | session->s_cap_reconnect = 0; | |
2832 | spin_unlock(&session->s_cap_lock); | |
2833 | ||
2f2dc053 SW |
2834 | /* |
2835 | * snaprealms. we provide mds with the ino, seq (version), and | |
2836 | * parent for all of our realms. If the mds has any newer info, | |
2837 | * it will tell us. | |
2838 | */ | |
a105f00c SW |
2839 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
2840 | struct ceph_snap_realm *realm = | |
2841 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 2842 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
2843 | |
2844 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
2845 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
2846 | sr_rec.ino = cpu_to_le64(realm->ino); |
2847 | sr_rec.seq = cpu_to_le64(realm->seq); | |
2848 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
2849 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
2850 | if (err) | |
2851 | goto fail; | |
2f2dc053 | 2852 | } |
2f2dc053 | 2853 | |
20cb34ae SW |
2854 | if (recon_state.flock) |
2855 | reply->hdr.version = cpu_to_le16(2); | |
44c99757 YZ |
2856 | |
2857 | /* raced with cap release? */ | |
2858 | if (s_nr_caps != recon_state.nr_caps) { | |
2859 | struct page *page = list_first_entry(&pagelist->head, | |
2860 | struct page, lru); | |
2861 | __le32 *addr = kmap_atomic(page); | |
2862 | *addr = cpu_to_le32(recon_state.nr_caps); | |
2863 | kunmap_atomic(addr); | |
ebf18f47 | 2864 | } |
44c99757 YZ |
2865 | |
2866 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
2867 | ceph_msg_data_add_pagelist(reply, pagelist); | |
2f2dc053 SW |
2868 | ceph_con_send(&session->s_con, reply); |
2869 | ||
9abf82b8 SW |
2870 | mutex_unlock(&session->s_mutex); |
2871 | ||
2872 | mutex_lock(&mdsc->mutex); | |
2873 | __wake_requests(mdsc, &session->s_waiting); | |
2874 | mutex_unlock(&mdsc->mutex); | |
2875 | ||
2f2dc053 | 2876 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
2877 | return; |
2878 | ||
93cea5be | 2879 | fail: |
2f2dc053 | 2880 | ceph_msg_put(reply); |
9abf82b8 SW |
2881 | up_read(&mdsc->snap_rwsem); |
2882 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
2883 | fail_nomsg: |
2884 | ceph_pagelist_release(pagelist); | |
93cea5be | 2885 | fail_nopagelist: |
9abf82b8 | 2886 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 2887 | return; |
2f2dc053 SW |
2888 | } |
2889 | ||
2890 | ||
2891 | /* | |
2892 | * compare old and new mdsmaps, kicking requests | |
2893 | * and closing out old connections as necessary | |
2894 | * | |
2895 | * called under mdsc->mutex. | |
2896 | */ | |
2897 | static void check_new_map(struct ceph_mds_client *mdsc, | |
2898 | struct ceph_mdsmap *newmap, | |
2899 | struct ceph_mdsmap *oldmap) | |
2900 | { | |
2901 | int i; | |
2902 | int oldstate, newstate; | |
2903 | struct ceph_mds_session *s; | |
2904 | ||
2905 | dout("check_new_map new %u old %u\n", | |
2906 | newmap->m_epoch, oldmap->m_epoch); | |
2907 | ||
2908 | for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2909 | if (mdsc->sessions[i] == NULL) | |
2910 | continue; | |
2911 | s = mdsc->sessions[i]; | |
2912 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
2913 | newstate = ceph_mdsmap_get_state(newmap, i); | |
2914 | ||
0deb01c9 | 2915 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 2916 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 2917 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 2918 | ceph_mds_state_name(newstate), |
0deb01c9 | 2919 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
a687ecaf | 2920 | ceph_session_state_name(s->s_state)); |
2f2dc053 | 2921 | |
3e8f43a0 YZ |
2922 | if (i >= newmap->m_max_mds || |
2923 | memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
2f2dc053 SW |
2924 | ceph_mdsmap_get_addr(newmap, i), |
2925 | sizeof(struct ceph_entity_addr))) { | |
2926 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
2927 | /* the session never opened, just close it | |
2928 | * out now */ | |
2929 | __wake_requests(mdsc, &s->s_waiting); | |
2600d2dd | 2930 | __unregister_session(mdsc, s); |
2f2dc053 SW |
2931 | } else { |
2932 | /* just close it */ | |
2933 | mutex_unlock(&mdsc->mutex); | |
2934 | mutex_lock(&s->s_mutex); | |
2935 | mutex_lock(&mdsc->mutex); | |
2936 | ceph_con_close(&s->s_con); | |
2937 | mutex_unlock(&s->s_mutex); | |
2938 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2939 | } | |
2940 | ||
2941 | /* kick any requests waiting on the recovering mds */ | |
29790f26 | 2942 | kick_requests(mdsc, i); |
2f2dc053 SW |
2943 | } else if (oldstate == newstate) { |
2944 | continue; /* nothing new with this mds */ | |
2945 | } | |
2946 | ||
2947 | /* | |
2948 | * send reconnect? | |
2949 | */ | |
2950 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
2951 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
2952 | mutex_unlock(&mdsc->mutex); | |
2953 | send_mds_reconnect(mdsc, s); | |
2954 | mutex_lock(&mdsc->mutex); | |
2955 | } | |
2f2dc053 SW |
2956 | |
2957 | /* | |
29790f26 | 2958 | * kick request on any mds that has gone active. |
2f2dc053 SW |
2959 | */ |
2960 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
2961 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
2962 | if (oldstate != CEPH_MDS_STATE_CREATING && |
2963 | oldstate != CEPH_MDS_STATE_STARTING) | |
2964 | pr_info("mds%d recovery completed\n", s->s_mds); | |
2965 | kick_requests(mdsc, i); | |
2f2dc053 | 2966 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 2967 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
2968 | } |
2969 | } | |
cb170a22 SW |
2970 | |
2971 | for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) { | |
2972 | s = mdsc->sessions[i]; | |
2973 | if (!s) | |
2974 | continue; | |
2975 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
2976 | continue; | |
2977 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
2978 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
2979 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
2980 | dout(" connecting to export targets of laggy mds%d\n", | |
2981 | i); | |
2982 | __open_export_target_sessions(mdsc, s); | |
2983 | } | |
2984 | } | |
2f2dc053 SW |
2985 | } |
2986 | ||
2987 | ||
2988 | ||
2989 | /* | |
2990 | * leases | |
2991 | */ | |
2992 | ||
2993 | /* | |
2994 | * caller must hold session s_mutex, dentry->d_lock | |
2995 | */ | |
2996 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
2997 | { | |
2998 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
2999 | ||
3000 | ceph_put_mds_session(di->lease_session); | |
3001 | di->lease_session = NULL; | |
3002 | } | |
3003 | ||
2600d2dd SW |
3004 | static void handle_lease(struct ceph_mds_client *mdsc, |
3005 | struct ceph_mds_session *session, | |
3006 | struct ceph_msg *msg) | |
2f2dc053 | 3007 | { |
3d14c5d2 | 3008 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 3009 | struct inode *inode; |
2f2dc053 SW |
3010 | struct dentry *parent, *dentry; |
3011 | struct ceph_dentry_info *di; | |
2600d2dd | 3012 | int mds = session->s_mds; |
2f2dc053 | 3013 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 3014 | u32 seq; |
2f2dc053 | 3015 | struct ceph_vino vino; |
2f2dc053 SW |
3016 | struct qstr dname; |
3017 | int release = 0; | |
3018 | ||
2f2dc053 SW |
3019 | dout("handle_lease from mds%d\n", mds); |
3020 | ||
3021 | /* decode */ | |
3022 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
3023 | goto bad; | |
3024 | vino.ino = le64_to_cpu(h->ino); | |
3025 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 3026 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
3027 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
3028 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
3029 | if (dname.len != get_unaligned_le32(h+1)) | |
3030 | goto bad; | |
3031 | ||
2f2dc053 SW |
3032 | /* lookup inode */ |
3033 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
3034 | dout("handle_lease %s, ino %llx %p %.*s\n", |
3035 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 3036 | dname.len, dname.name); |
6cd3bcad YZ |
3037 | |
3038 | mutex_lock(&session->s_mutex); | |
3039 | session->s_seq++; | |
3040 | ||
2f2dc053 SW |
3041 | if (inode == NULL) { |
3042 | dout("handle_lease no inode %llx\n", vino.ino); | |
3043 | goto release; | |
3044 | } | |
2f2dc053 SW |
3045 | |
3046 | /* dentry */ | |
3047 | parent = d_find_alias(inode); | |
3048 | if (!parent) { | |
3049 | dout("no parent dentry on inode %p\n", inode); | |
3050 | WARN_ON(1); | |
3051 | goto release; /* hrm... */ | |
3052 | } | |
3053 | dname.hash = full_name_hash(dname.name, dname.len); | |
3054 | dentry = d_lookup(parent, &dname); | |
3055 | dput(parent); | |
3056 | if (!dentry) | |
3057 | goto release; | |
3058 | ||
3059 | spin_lock(&dentry->d_lock); | |
3060 | di = ceph_dentry(dentry); | |
3061 | switch (h->action) { | |
3062 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 3063 | if (di->lease_session == session) { |
1e5ea23d SW |
3064 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
3065 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
3066 | __ceph_mdsc_drop_dentry_lease(dentry); |
3067 | } | |
3068 | release = 1; | |
3069 | break; | |
3070 | ||
3071 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 3072 | if (di->lease_session == session && |
2f2dc053 SW |
3073 | di->lease_gen == session->s_cap_gen && |
3074 | di->lease_renew_from && | |
3075 | di->lease_renew_after == 0) { | |
3076 | unsigned long duration = | |
3077 | le32_to_cpu(h->duration_ms) * HZ / 1000; | |
3078 | ||
1e5ea23d | 3079 | di->lease_seq = seq; |
2f2dc053 SW |
3080 | dentry->d_time = di->lease_renew_from + duration; |
3081 | di->lease_renew_after = di->lease_renew_from + | |
3082 | (duration >> 1); | |
3083 | di->lease_renew_from = 0; | |
3084 | } | |
3085 | break; | |
3086 | } | |
3087 | spin_unlock(&dentry->d_lock); | |
3088 | dput(dentry); | |
3089 | ||
3090 | if (!release) | |
3091 | goto out; | |
3092 | ||
3093 | release: | |
3094 | /* let's just reuse the same message */ | |
3095 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
3096 | ceph_msg_get(msg); | |
3097 | ceph_con_send(&session->s_con, msg); | |
3098 | ||
3099 | out: | |
3100 | iput(inode); | |
3101 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
3102 | return; |
3103 | ||
3104 | bad: | |
3105 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 3106 | ceph_msg_dump(msg); |
2f2dc053 SW |
3107 | } |
3108 | ||
3109 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
3110 | struct inode *inode, | |
3111 | struct dentry *dentry, char action, | |
3112 | u32 seq) | |
3113 | { | |
3114 | struct ceph_msg *msg; | |
3115 | struct ceph_mds_lease *lease; | |
3116 | int len = sizeof(*lease) + sizeof(u32); | |
3117 | int dnamelen = 0; | |
3118 | ||
3119 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
3120 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
3121 | dnamelen = dentry->d_name.len; | |
3122 | len += dnamelen; | |
3123 | ||
b61c2763 | 3124 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 3125 | if (!msg) |
2f2dc053 SW |
3126 | return; |
3127 | lease = msg->front.iov_base; | |
3128 | lease->action = action; | |
2f2dc053 SW |
3129 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
3130 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
3131 | lease->seq = cpu_to_le32(seq); | |
3132 | put_unaligned_le32(dnamelen, lease + 1); | |
3133 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
3134 | ||
3135 | /* | |
3136 | * if this is a preemptive lease RELEASE, no need to | |
3137 | * flush request stream, since the actual request will | |
3138 | * soon follow. | |
3139 | */ | |
3140 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
3141 | ||
3142 | ceph_con_send(&session->s_con, msg); | |
3143 | } | |
3144 | ||
3145 | /* | |
3146 | * Preemptively release a lease we expect to invalidate anyway. | |
3147 | * Pass @inode always, @dentry is optional. | |
3148 | */ | |
3149 | void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode, | |
2f90b852 | 3150 | struct dentry *dentry) |
2f2dc053 SW |
3151 | { |
3152 | struct ceph_dentry_info *di; | |
3153 | struct ceph_mds_session *session; | |
3154 | u32 seq; | |
3155 | ||
3156 | BUG_ON(inode == NULL); | |
3157 | BUG_ON(dentry == NULL); | |
2f2dc053 SW |
3158 | |
3159 | /* is dentry lease valid? */ | |
3160 | spin_lock(&dentry->d_lock); | |
3161 | di = ceph_dentry(dentry); | |
3162 | if (!di || !di->lease_session || | |
3163 | di->lease_session->s_mds < 0 || | |
3164 | di->lease_gen != di->lease_session->s_cap_gen || | |
3165 | !time_before(jiffies, dentry->d_time)) { | |
3166 | dout("lease_release inode %p dentry %p -- " | |
2f90b852 SW |
3167 | "no lease\n", |
3168 | inode, dentry); | |
2f2dc053 SW |
3169 | spin_unlock(&dentry->d_lock); |
3170 | return; | |
3171 | } | |
3172 | ||
3173 | /* we do have a lease on this dentry; note mds and seq */ | |
3174 | session = ceph_get_mds_session(di->lease_session); | |
3175 | seq = di->lease_seq; | |
3176 | __ceph_mdsc_drop_dentry_lease(dentry); | |
3177 | spin_unlock(&dentry->d_lock); | |
3178 | ||
2f90b852 SW |
3179 | dout("lease_release inode %p dentry %p to mds%d\n", |
3180 | inode, dentry, session->s_mds); | |
2f2dc053 SW |
3181 | ceph_mdsc_lease_send_msg(session, inode, dentry, |
3182 | CEPH_MDS_LEASE_RELEASE, seq); | |
3183 | ceph_put_mds_session(session); | |
3184 | } | |
3185 | ||
3186 | /* | |
3187 | * drop all leases (and dentry refs) in preparation for umount | |
3188 | */ | |
3189 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3190 | { | |
3191 | int i; | |
3192 | ||
3193 | dout("drop_leases\n"); | |
3194 | mutex_lock(&mdsc->mutex); | |
3195 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3196 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3197 | if (!s) | |
3198 | continue; | |
3199 | mutex_unlock(&mdsc->mutex); | |
3200 | mutex_lock(&s->s_mutex); | |
3201 | mutex_unlock(&s->s_mutex); | |
3202 | ceph_put_mds_session(s); | |
3203 | mutex_lock(&mdsc->mutex); | |
3204 | } | |
3205 | mutex_unlock(&mdsc->mutex); | |
3206 | } | |
3207 | ||
3208 | ||
3209 | ||
3210 | /* | |
3211 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3212 | */ | |
3213 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3214 | { | |
3215 | int delay = 5; | |
3216 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3217 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3218 | } | |
3219 | ||
3220 | static void delayed_work(struct work_struct *work) | |
3221 | { | |
3222 | int i; | |
3223 | struct ceph_mds_client *mdsc = | |
3224 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3225 | int renew_interval; | |
3226 | int renew_caps; | |
3227 | ||
3228 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3229 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3230 | |
3231 | mutex_lock(&mdsc->mutex); | |
3232 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3233 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3234 | mdsc->last_renew_caps); | |
3235 | if (renew_caps) | |
3236 | mdsc->last_renew_caps = jiffies; | |
3237 | ||
3238 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3239 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3240 | if (s == NULL) | |
3241 | continue; | |
3242 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3243 | dout("resending session close request for mds%d\n", | |
3244 | s->s_mds); | |
3245 | request_close_session(mdsc, s); | |
3246 | ceph_put_mds_session(s); | |
3247 | continue; | |
3248 | } | |
3249 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3250 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3251 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3252 | pr_info("mds%d hung\n", s->s_mds); | |
3253 | } | |
3254 | } | |
3255 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3256 | /* this mds is failed or recovering, just wait */ | |
3257 | ceph_put_mds_session(s); | |
3258 | continue; | |
3259 | } | |
3260 | mutex_unlock(&mdsc->mutex); | |
3261 | ||
3262 | mutex_lock(&s->s_mutex); | |
3263 | if (renew_caps) | |
3264 | send_renew_caps(mdsc, s); | |
3265 | else | |
3266 | ceph_con_keepalive(&s->s_con); | |
ee6b272b | 3267 | ceph_add_cap_releases(mdsc, s); |
aab53dd9 SW |
3268 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3269 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3270 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3271 | mutex_unlock(&s->s_mutex); |
3272 | ceph_put_mds_session(s); | |
3273 | ||
3274 | mutex_lock(&mdsc->mutex); | |
3275 | } | |
3276 | mutex_unlock(&mdsc->mutex); | |
3277 | ||
3278 | schedule_delayed(mdsc); | |
3279 | } | |
3280 | ||
3d14c5d2 | 3281 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3282 | |
2f2dc053 | 3283 | { |
3d14c5d2 YS |
3284 | struct ceph_mds_client *mdsc; |
3285 | ||
3286 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3287 | if (!mdsc) | |
3288 | return -ENOMEM; | |
3289 | mdsc->fsc = fsc; | |
3290 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3291 | mutex_init(&mdsc->mutex); |
3292 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
fb3101b6 | 3293 | if (mdsc->mdsmap == NULL) { |
3294 | kfree(mdsc); | |
2d06eeb8 | 3295 | return -ENOMEM; |
fb3101b6 | 3296 | } |
2d06eeb8 | 3297 | |
2f2dc053 | 3298 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3299 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3300 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3301 | mdsc->sessions = NULL; | |
3302 | mdsc->max_sessions = 0; | |
3303 | mdsc->stopping = 0; | |
3304 | init_rwsem(&mdsc->snap_rwsem); | |
a105f00c | 3305 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3306 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3307 | spin_lock_init(&mdsc->snap_empty_lock); | |
3308 | mdsc->last_tid = 0; | |
44ca18f2 | 3309 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3310 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3311 | mdsc->last_renew_caps = jiffies; | |
3312 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3313 | spin_lock_init(&mdsc->cap_delay_lock); | |
3314 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3315 | spin_lock_init(&mdsc->snap_flush_lock); | |
3316 | mdsc->cap_flush_seq = 0; | |
3317 | INIT_LIST_HEAD(&mdsc->cap_dirty); | |
db354052 | 3318 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3319 | mdsc->num_cap_flushing = 0; |
3320 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3321 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3322 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3323 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3324 | |
37151668 | 3325 | ceph_caps_init(mdsc); |
3d14c5d2 | 3326 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3327 | |
5f44f142 | 3328 | return 0; |
2f2dc053 SW |
3329 | } |
3330 | ||
3331 | /* | |
3332 | * Wait for safe replies on open mds requests. If we time out, drop | |
3333 | * all requests from the tree to avoid dangling dentry refs. | |
3334 | */ | |
3335 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3336 | { | |
3337 | struct ceph_mds_request *req; | |
3d14c5d2 | 3338 | struct ceph_fs_client *fsc = mdsc->fsc; |
2f2dc053 SW |
3339 | |
3340 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3341 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3342 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3343 | |
2f2dc053 SW |
3344 | dout("wait_requests waiting for requests\n"); |
3345 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
3d14c5d2 | 3346 | fsc->client->options->mount_timeout * HZ); |
2f2dc053 SW |
3347 | |
3348 | /* tear down remaining requests */ | |
44ca18f2 SW |
3349 | mutex_lock(&mdsc->mutex); |
3350 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3351 | dout("wait_requests timed out on tid %llu\n", |
3352 | req->r_tid); | |
44ca18f2 | 3353 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3354 | } |
3355 | } | |
3356 | mutex_unlock(&mdsc->mutex); | |
3357 | dout("wait_requests done\n"); | |
3358 | } | |
3359 | ||
3360 | /* | |
3361 | * called before mount is ro, and before dentries are torn down. | |
3362 | * (hmm, does this still race with new lookups?) | |
3363 | */ | |
3364 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3365 | { | |
3366 | dout("pre_umount\n"); | |
3367 | mdsc->stopping = 1; | |
3368 | ||
3369 | drop_leases(mdsc); | |
afcdaea3 | 3370 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3371 | wait_requests(mdsc); |
17c688c3 SW |
3372 | |
3373 | /* | |
3374 | * wait for reply handlers to drop their request refs and | |
3375 | * their inode/dcache refs | |
3376 | */ | |
3377 | ceph_msgr_flush(); | |
2f2dc053 SW |
3378 | } |
3379 | ||
3380 | /* | |
3381 | * wait for all write mds requests to flush. | |
3382 | */ | |
3383 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3384 | { | |
80fc7314 | 3385 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3386 | struct rb_node *n; |
2f2dc053 SW |
3387 | |
3388 | mutex_lock(&mdsc->mutex); | |
3389 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3390 | restart: |
44ca18f2 SW |
3391 | req = __get_oldest_req(mdsc); |
3392 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3393 | /* find next request */ |
3394 | n = rb_next(&req->r_node); | |
3395 | if (n) | |
3396 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3397 | else | |
3398 | nextreq = NULL; | |
44ca18f2 SW |
3399 | if ((req->r_op & CEPH_MDS_OP_WRITE)) { |
3400 | /* write op */ | |
3401 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3402 | if (nextreq) |
3403 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3404 | mutex_unlock(&mdsc->mutex); |
3405 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3406 | req->r_tid, want_tid); | |
3407 | wait_for_completion(&req->r_safe_completion); | |
3408 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3409 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3410 | if (!nextreq) |
3411 | break; /* next dne before, so we're done! */ | |
3412 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3413 | /* next request was removed from tree */ | |
3414 | ceph_mdsc_put_request(nextreq); | |
3415 | goto restart; | |
3416 | } | |
3417 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3418 | } |
80fc7314 | 3419 | req = nextreq; |
2f2dc053 SW |
3420 | } |
3421 | mutex_unlock(&mdsc->mutex); | |
3422 | dout("wait_unsafe_requests done\n"); | |
3423 | } | |
3424 | ||
3425 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3426 | { | |
3427 | u64 want_tid, want_flush; | |
3428 | ||
3d14c5d2 | 3429 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3430 | return; |
3431 | ||
2f2dc053 SW |
3432 | dout("sync\n"); |
3433 | mutex_lock(&mdsc->mutex); | |
3434 | want_tid = mdsc->last_tid; | |
3435 | want_flush = mdsc->cap_flush_seq; | |
3436 | mutex_unlock(&mdsc->mutex); | |
3437 | dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush); | |
3438 | ||
afcdaea3 | 3439 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 SW |
3440 | |
3441 | wait_unsafe_requests(mdsc, want_tid); | |
3442 | wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush)); | |
3443 | } | |
3444 | ||
f3c60c59 SW |
3445 | /* |
3446 | * true if all sessions are closed, or we force unmount | |
3447 | */ | |
7fd7d101 | 3448 | static bool done_closing_sessions(struct ceph_mds_client *mdsc) |
f3c60c59 SW |
3449 | { |
3450 | int i, n = 0; | |
3451 | ||
3d14c5d2 | 3452 | if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 SW |
3453 | return true; |
3454 | ||
3455 | mutex_lock(&mdsc->mutex); | |
3456 | for (i = 0; i < mdsc->max_sessions; i++) | |
3457 | if (mdsc->sessions[i]) | |
3458 | n++; | |
3459 | mutex_unlock(&mdsc->mutex); | |
3460 | return n == 0; | |
3461 | } | |
2f2dc053 SW |
3462 | |
3463 | /* | |
3464 | * called after sb is ro. | |
3465 | */ | |
3466 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3467 | { | |
3468 | struct ceph_mds_session *session; | |
3469 | int i; | |
3d14c5d2 YS |
3470 | struct ceph_fs_client *fsc = mdsc->fsc; |
3471 | unsigned long timeout = fsc->client->options->mount_timeout * HZ; | |
2f2dc053 SW |
3472 | |
3473 | dout("close_sessions\n"); | |
3474 | ||
2f2dc053 | 3475 | /* close sessions */ |
f3c60c59 SW |
3476 | mutex_lock(&mdsc->mutex); |
3477 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3478 | session = __ceph_lookup_mds_session(mdsc, i); | |
3479 | if (!session) | |
3480 | continue; | |
2f2dc053 | 3481 | mutex_unlock(&mdsc->mutex); |
f3c60c59 SW |
3482 | mutex_lock(&session->s_mutex); |
3483 | __close_session(mdsc, session); | |
3484 | mutex_unlock(&session->s_mutex); | |
3485 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3486 | mutex_lock(&mdsc->mutex); |
3487 | } | |
f3c60c59 SW |
3488 | mutex_unlock(&mdsc->mutex); |
3489 | ||
3490 | dout("waiting for sessions to close\n"); | |
3491 | wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc), | |
3492 | timeout); | |
2f2dc053 SW |
3493 | |
3494 | /* tear down remaining sessions */ | |
f3c60c59 | 3495 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3496 | for (i = 0; i < mdsc->max_sessions; i++) { |
3497 | if (mdsc->sessions[i]) { | |
3498 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3499 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3500 | mutex_unlock(&mdsc->mutex); |
3501 | mutex_lock(&session->s_mutex); | |
3502 | remove_session_caps(session); | |
3503 | mutex_unlock(&session->s_mutex); | |
3504 | ceph_put_mds_session(session); | |
3505 | mutex_lock(&mdsc->mutex); | |
3506 | } | |
3507 | } | |
2f2dc053 | 3508 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3509 | mutex_unlock(&mdsc->mutex); |
3510 | ||
3511 | ceph_cleanup_empty_realms(mdsc); | |
3512 | ||
3513 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3514 | ||
3515 | dout("stopped\n"); | |
3516 | } | |
3517 | ||
3d14c5d2 | 3518 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3519 | { |
3520 | dout("stop\n"); | |
3521 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3522 | if (mdsc->mdsmap) | |
3523 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3524 | kfree(mdsc->sessions); | |
37151668 | 3525 | ceph_caps_finalize(mdsc); |
2f2dc053 SW |
3526 | } |
3527 | ||
3d14c5d2 YS |
3528 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3529 | { | |
3530 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
3531 | ||
ef550f6f | 3532 | dout("mdsc_destroy %p\n", mdsc); |
3d14c5d2 | 3533 | ceph_mdsc_stop(mdsc); |
ef550f6f SW |
3534 | |
3535 | /* flush out any connection work with references to us */ | |
3536 | ceph_msgr_flush(); | |
3537 | ||
3d14c5d2 YS |
3538 | fsc->mdsc = NULL; |
3539 | kfree(mdsc); | |
ef550f6f | 3540 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3541 | } |
3542 | ||
2f2dc053 SW |
3543 | |
3544 | /* | |
3545 | * handle mds map update. | |
3546 | */ | |
3547 | void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg) | |
3548 | { | |
3549 | u32 epoch; | |
3550 | u32 maplen; | |
3551 | void *p = msg->front.iov_base; | |
3552 | void *end = p + msg->front.iov_len; | |
3553 | struct ceph_mdsmap *newmap, *oldmap; | |
3554 | struct ceph_fsid fsid; | |
3555 | int err = -EINVAL; | |
3556 | ||
3557 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3558 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3559 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3560 | return; |
c89136ea SW |
3561 | epoch = ceph_decode_32(&p); |
3562 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3563 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3564 | ||
3565 | /* do we need it? */ | |
3d14c5d2 | 3566 | ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch); |
2f2dc053 SW |
3567 | mutex_lock(&mdsc->mutex); |
3568 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3569 | dout("handle_map epoch %u <= our %u\n", | |
3570 | epoch, mdsc->mdsmap->m_epoch); | |
3571 | mutex_unlock(&mdsc->mutex); | |
3572 | return; | |
3573 | } | |
3574 | ||
3575 | newmap = ceph_mdsmap_decode(&p, end); | |
3576 | if (IS_ERR(newmap)) { | |
3577 | err = PTR_ERR(newmap); | |
3578 | goto bad_unlock; | |
3579 | } | |
3580 | ||
3581 | /* swap into place */ | |
3582 | if (mdsc->mdsmap) { | |
3583 | oldmap = mdsc->mdsmap; | |
3584 | mdsc->mdsmap = newmap; | |
3585 | check_new_map(mdsc, newmap, oldmap); | |
3586 | ceph_mdsmap_destroy(oldmap); | |
3587 | } else { | |
3588 | mdsc->mdsmap = newmap; /* first mds map */ | |
3589 | } | |
3d14c5d2 | 3590 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3591 | |
3592 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3593 | ||
3594 | mutex_unlock(&mdsc->mutex); | |
3595 | schedule_delayed(mdsc); | |
3596 | return; | |
3597 | ||
3598 | bad_unlock: | |
3599 | mutex_unlock(&mdsc->mutex); | |
3600 | bad: | |
3601 | pr_err("error decoding mdsmap %d\n", err); | |
3602 | return; | |
3603 | } | |
3604 | ||
3605 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3606 | { | |
3607 | struct ceph_mds_session *s = con->private; | |
3608 | ||
3609 | if (get_session(s)) { | |
2600d2dd | 3610 | dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref)); |
2f2dc053 SW |
3611 | return con; |
3612 | } | |
3613 | dout("mdsc con_get %p FAIL\n", s); | |
3614 | return NULL; | |
3615 | } | |
3616 | ||
3617 | static void con_put(struct ceph_connection *con) | |
3618 | { | |
3619 | struct ceph_mds_session *s = con->private; | |
3620 | ||
7d8e18a6 | 3621 | dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1); |
2f2dc053 SW |
3622 | ceph_put_mds_session(s); |
3623 | } | |
3624 | ||
3625 | /* | |
3626 | * if the client is unresponsive for long enough, the mds will kill | |
3627 | * the session entirely. | |
3628 | */ | |
3629 | static void peer_reset(struct ceph_connection *con) | |
3630 | { | |
3631 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 3632 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 3633 | |
f3ae1b97 | 3634 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 3635 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
3636 | } |
3637 | ||
3638 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
3639 | { | |
3640 | struct ceph_mds_session *s = con->private; | |
3641 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3642 | int type = le16_to_cpu(msg->hdr.type); | |
3643 | ||
2600d2dd SW |
3644 | mutex_lock(&mdsc->mutex); |
3645 | if (__verify_registered_session(mdsc, s) < 0) { | |
3646 | mutex_unlock(&mdsc->mutex); | |
3647 | goto out; | |
3648 | } | |
3649 | mutex_unlock(&mdsc->mutex); | |
3650 | ||
2f2dc053 SW |
3651 | switch (type) { |
3652 | case CEPH_MSG_MDS_MAP: | |
3653 | ceph_mdsc_handle_map(mdsc, msg); | |
3654 | break; | |
3655 | case CEPH_MSG_CLIENT_SESSION: | |
3656 | handle_session(s, msg); | |
3657 | break; | |
3658 | case CEPH_MSG_CLIENT_REPLY: | |
3659 | handle_reply(s, msg); | |
3660 | break; | |
3661 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 3662 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
3663 | break; |
3664 | case CEPH_MSG_CLIENT_CAPS: | |
3665 | ceph_handle_caps(s, msg); | |
3666 | break; | |
3667 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 3668 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
3669 | break; |
3670 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 3671 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
3672 | break; |
3673 | ||
3674 | default: | |
3675 | pr_err("received unknown message type %d %s\n", type, | |
3676 | ceph_msg_type_name(type)); | |
3677 | } | |
2600d2dd | 3678 | out: |
2f2dc053 SW |
3679 | ceph_msg_put(msg); |
3680 | } | |
3681 | ||
4e7a5dcd SW |
3682 | /* |
3683 | * authentication | |
3684 | */ | |
a3530df3 AE |
3685 | |
3686 | /* | |
3687 | * Note: returned pointer is the address of a structure that's | |
3688 | * managed separately. Caller must *not* attempt to free it. | |
3689 | */ | |
3690 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 3691 | int *proto, int force_new) |
4e7a5dcd SW |
3692 | { |
3693 | struct ceph_mds_session *s = con->private; | |
3694 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3695 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 3696 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 3697 | |
74f1869f | 3698 | if (force_new && auth->authorizer) { |
27859f97 | 3699 | ceph_auth_destroy_authorizer(ac, auth->authorizer); |
74f1869f | 3700 | auth->authorizer = NULL; |
4e7a5dcd | 3701 | } |
27859f97 SW |
3702 | if (!auth->authorizer) { |
3703 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3704 | auth); | |
0bed9b5c SW |
3705 | if (ret) |
3706 | return ERR_PTR(ret); | |
27859f97 SW |
3707 | } else { |
3708 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
3709 | auth); | |
a255651d | 3710 | if (ret) |
a3530df3 | 3711 | return ERR_PTR(ret); |
4e7a5dcd | 3712 | } |
4e7a5dcd | 3713 | *proto = ac->protocol; |
74f1869f | 3714 | |
a3530df3 | 3715 | return auth; |
4e7a5dcd SW |
3716 | } |
3717 | ||
3718 | ||
3719 | static int verify_authorizer_reply(struct ceph_connection *con, int len) | |
3720 | { | |
3721 | struct ceph_mds_session *s = con->private; | |
3722 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3723 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 3724 | |
27859f97 | 3725 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len); |
4e7a5dcd SW |
3726 | } |
3727 | ||
9bd2e6f8 SW |
3728 | static int invalidate_authorizer(struct ceph_connection *con) |
3729 | { | |
3730 | struct ceph_mds_session *s = con->private; | |
3731 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 3732 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 3733 | |
27859f97 | 3734 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 3735 | |
3d14c5d2 | 3736 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
3737 | } |
3738 | ||
53ded495 AE |
3739 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
3740 | struct ceph_msg_header *hdr, int *skip) | |
3741 | { | |
3742 | struct ceph_msg *msg; | |
3743 | int type = (int) le16_to_cpu(hdr->type); | |
3744 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
3745 | ||
3746 | if (con->in_msg) | |
3747 | return con->in_msg; | |
3748 | ||
3749 | *skip = 0; | |
3750 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
3751 | if (!msg) { | |
3752 | pr_err("unable to allocate msg type %d len %d\n", | |
3753 | type, front_len); | |
3754 | return NULL; | |
3755 | } | |
53ded495 AE |
3756 | |
3757 | return msg; | |
3758 | } | |
3759 | ||
33d07337 YZ |
3760 | static int sign_message(struct ceph_connection *con, struct ceph_msg *msg) |
3761 | { | |
3762 | struct ceph_mds_session *s = con->private; | |
3763 | struct ceph_auth_handshake *auth = &s->s_auth; | |
3764 | return ceph_auth_sign_message(auth, msg); | |
3765 | } | |
3766 | ||
3767 | static int check_message_signature(struct ceph_connection *con, struct ceph_msg *msg) | |
3768 | { | |
3769 | struct ceph_mds_session *s = con->private; | |
3770 | struct ceph_auth_handshake *auth = &s->s_auth; | |
3771 | return ceph_auth_check_message_signature(auth, msg); | |
3772 | } | |
3773 | ||
9e32789f | 3774 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
3775 | .get = con_get, |
3776 | .put = con_put, | |
3777 | .dispatch = dispatch, | |
4e7a5dcd SW |
3778 | .get_authorizer = get_authorizer, |
3779 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 3780 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 3781 | .peer_reset = peer_reset, |
53ded495 | 3782 | .alloc_msg = mds_alloc_msg, |
33d07337 YZ |
3783 | .sign_message = sign_message, |
3784 | .check_message_signature = check_message_signature, | |
2f2dc053 SW |
3785 | }; |
3786 | ||
2f2dc053 | 3787 | /* eof */ |