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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 | 3 | |
496e5955 | 4 | #include <linux/fs.h> |
2f2dc053 | 5 | #include <linux/wait.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
54008399 | 7 | #include <linux/gfp.h> |
2f2dc053 | 8 | #include <linux/sched.h> |
3d14c5d2 YS |
9 | #include <linux/debugfs.h> |
10 | #include <linux/seq_file.h> | |
3e0708b9 | 11 | #include <linux/ratelimit.h> |
2f2dc053 | 12 | |
2f2dc053 | 13 | #include "super.h" |
3d14c5d2 YS |
14 | #include "mds_client.h" |
15 | ||
1fe60e51 | 16 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
17 | #include <linux/ceph/messenger.h> |
18 | #include <linux/ceph/decode.h> | |
19 | #include <linux/ceph/pagelist.h> | |
20 | #include <linux/ceph/auth.h> | |
21 | #include <linux/ceph/debugfs.h> | |
2f2dc053 SW |
22 | |
23 | /* | |
24 | * A cluster of MDS (metadata server) daemons is responsible for | |
25 | * managing the file system namespace (the directory hierarchy and | |
26 | * inodes) and for coordinating shared access to storage. Metadata is | |
27 | * partitioning hierarchically across a number of servers, and that | |
28 | * partition varies over time as the cluster adjusts the distribution | |
29 | * in order to balance load. | |
30 | * | |
31 | * The MDS client is primarily responsible to managing synchronous | |
32 | * metadata requests for operations like open, unlink, and so forth. | |
33 | * If there is a MDS failure, we find out about it when we (possibly | |
34 | * request and) receive a new MDS map, and can resubmit affected | |
35 | * requests. | |
36 | * | |
37 | * For the most part, though, we take advantage of a lossless | |
38 | * communications channel to the MDS, and do not need to worry about | |
39 | * timing out or resubmitting requests. | |
40 | * | |
41 | * We maintain a stateful "session" with each MDS we interact with. | |
42 | * Within each session, we sent periodic heartbeat messages to ensure | |
43 | * any capabilities or leases we have been issues remain valid. If | |
44 | * the session times out and goes stale, our leases and capabilities | |
45 | * are no longer valid. | |
46 | */ | |
47 | ||
20cb34ae | 48 | struct ceph_reconnect_state { |
44c99757 | 49 | int nr_caps; |
20cb34ae | 50 | struct ceph_pagelist *pagelist; |
121f22a1 | 51 | unsigned msg_version; |
20cb34ae SW |
52 | }; |
53 | ||
2f2dc053 SW |
54 | static void __wake_requests(struct ceph_mds_client *mdsc, |
55 | struct list_head *head); | |
56 | ||
9e32789f | 57 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
58 | |
59 | ||
60 | /* | |
61 | * mds reply parsing | |
62 | */ | |
63 | ||
64 | /* | |
65 | * parse individual inode info | |
66 | */ | |
67 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 68 | struct ceph_mds_reply_info_in *info, |
12b4629a | 69 | u64 features) |
2f2dc053 SW |
70 | { |
71 | int err = -EIO; | |
72 | ||
73 | info->in = *p; | |
74 | *p += sizeof(struct ceph_mds_reply_inode) + | |
75 | sizeof(*info->in->fragtree.splits) * | |
76 | le32_to_cpu(info->in->fragtree.nsplits); | |
77 | ||
78 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
79 | ceph_decode_need(p, end, info->symlink_len, bad); | |
80 | info->symlink = *p; | |
81 | *p += info->symlink_len; | |
82 | ||
14303d20 SW |
83 | if (features & CEPH_FEATURE_DIRLAYOUTHASH) |
84 | ceph_decode_copy_safe(p, end, &info->dir_layout, | |
85 | sizeof(info->dir_layout), bad); | |
86 | else | |
87 | memset(&info->dir_layout, 0, sizeof(info->dir_layout)); | |
88 | ||
2f2dc053 SW |
89 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
90 | ceph_decode_need(p, end, info->xattr_len, bad); | |
91 | info->xattr_data = *p; | |
92 | *p += info->xattr_len; | |
fb01d1f8 YZ |
93 | |
94 | if (features & CEPH_FEATURE_MDS_INLINE_DATA) { | |
95 | ceph_decode_64_safe(p, end, info->inline_version, bad); | |
96 | ceph_decode_32_safe(p, end, info->inline_len, bad); | |
97 | ceph_decode_need(p, end, info->inline_len, bad); | |
98 | info->inline_data = *p; | |
99 | *p += info->inline_len; | |
100 | } else | |
101 | info->inline_version = CEPH_INLINE_NONE; | |
102 | ||
779fe0fb YZ |
103 | info->pool_ns_len = 0; |
104 | info->pool_ns_data = NULL; | |
5ea5c5e0 YZ |
105 | if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { |
106 | ceph_decode_32_safe(p, end, info->pool_ns_len, bad); | |
779fe0fb YZ |
107 | if (info->pool_ns_len > 0) { |
108 | ceph_decode_need(p, end, info->pool_ns_len, bad); | |
109 | info->pool_ns_data = *p; | |
110 | *p += info->pool_ns_len; | |
111 | } | |
5ea5c5e0 YZ |
112 | } |
113 | ||
2f2dc053 SW |
114 | return 0; |
115 | bad: | |
116 | return err; | |
117 | } | |
118 | ||
119 | /* | |
120 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
121 | * target inode. | |
122 | */ | |
123 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 124 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 125 | u64 features) |
2f2dc053 SW |
126 | { |
127 | int err; | |
128 | ||
129 | if (info->head->is_dentry) { | |
14303d20 | 130 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
131 | if (err < 0) |
132 | goto out_bad; | |
133 | ||
134 | if (unlikely(*p + sizeof(*info->dirfrag) > end)) | |
135 | goto bad; | |
136 | info->dirfrag = *p; | |
137 | *p += sizeof(*info->dirfrag) + | |
138 | sizeof(u32)*le32_to_cpu(info->dirfrag->ndist); | |
139 | if (unlikely(*p > end)) | |
140 | goto bad; | |
141 | ||
142 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
143 | ceph_decode_need(p, end, info->dname_len, bad); | |
144 | info->dname = *p; | |
145 | *p += info->dname_len; | |
146 | info->dlease = *p; | |
147 | *p += sizeof(*info->dlease); | |
148 | } | |
149 | ||
150 | if (info->head->is_target) { | |
14303d20 | 151 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
152 | if (err < 0) |
153 | goto out_bad; | |
154 | } | |
155 | ||
156 | if (unlikely(*p != end)) | |
157 | goto bad; | |
158 | return 0; | |
159 | ||
160 | bad: | |
161 | err = -EIO; | |
162 | out_bad: | |
163 | pr_err("problem parsing mds trace %d\n", err); | |
164 | return err; | |
165 | } | |
166 | ||
167 | /* | |
168 | * parse readdir results | |
169 | */ | |
170 | static int parse_reply_info_dir(void **p, void *end, | |
14303d20 | 171 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 172 | u64 features) |
2f2dc053 SW |
173 | { |
174 | u32 num, i = 0; | |
175 | int err; | |
176 | ||
177 | info->dir_dir = *p; | |
178 | if (*p + sizeof(*info->dir_dir) > end) | |
179 | goto bad; | |
180 | *p += sizeof(*info->dir_dir) + | |
181 | sizeof(u32)*le32_to_cpu(info->dir_dir->ndist); | |
182 | if (*p > end) | |
183 | goto bad; | |
184 | ||
185 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea | 186 | num = ceph_decode_32(p); |
956d39d6 YZ |
187 | { |
188 | u16 flags = ceph_decode_16(p); | |
189 | info->dir_end = !!(flags & CEPH_READDIR_FRAG_END); | |
190 | info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE); | |
f3c4ebe6 | 191 | info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER); |
79162547 | 192 | info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH); |
956d39d6 | 193 | } |
2f2dc053 SW |
194 | if (num == 0) |
195 | goto done; | |
196 | ||
2a5beea3 YZ |
197 | BUG_ON(!info->dir_entries); |
198 | if ((unsigned long)(info->dir_entries + num) > | |
199 | (unsigned long)info->dir_entries + info->dir_buf_size) { | |
54008399 YZ |
200 | pr_err("dir contents are larger than expected\n"); |
201 | WARN_ON(1); | |
202 | goto bad; | |
203 | } | |
2f2dc053 | 204 | |
54008399 | 205 | info->dir_nr = num; |
2f2dc053 | 206 | while (num) { |
2a5beea3 | 207 | struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; |
2f2dc053 SW |
208 | /* dentry */ |
209 | ceph_decode_need(p, end, sizeof(u32)*2, bad); | |
2a5beea3 YZ |
210 | rde->name_len = ceph_decode_32(p); |
211 | ceph_decode_need(p, end, rde->name_len, bad); | |
212 | rde->name = *p; | |
213 | *p += rde->name_len; | |
214 | dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); | |
215 | rde->lease = *p; | |
2f2dc053 SW |
216 | *p += sizeof(struct ceph_mds_reply_lease); |
217 | ||
218 | /* inode */ | |
2a5beea3 | 219 | err = parse_reply_info_in(p, end, &rde->inode, features); |
2f2dc053 SW |
220 | if (err < 0) |
221 | goto out_bad; | |
8974eebd YZ |
222 | /* ceph_readdir_prepopulate() will update it */ |
223 | rde->offset = 0; | |
2f2dc053 SW |
224 | i++; |
225 | num--; | |
226 | } | |
227 | ||
228 | done: | |
229 | if (*p != end) | |
230 | goto bad; | |
231 | return 0; | |
232 | ||
233 | bad: | |
234 | err = -EIO; | |
235 | out_bad: | |
236 | pr_err("problem parsing dir contents %d\n", err); | |
237 | return err; | |
238 | } | |
239 | ||
25933abd HS |
240 | /* |
241 | * parse fcntl F_GETLK results | |
242 | */ | |
243 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 244 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 245 | u64 features) |
25933abd HS |
246 | { |
247 | if (*p + sizeof(*info->filelock_reply) > end) | |
248 | goto bad; | |
249 | ||
250 | info->filelock_reply = *p; | |
251 | *p += sizeof(*info->filelock_reply); | |
252 | ||
253 | if (unlikely(*p != end)) | |
254 | goto bad; | |
255 | return 0; | |
256 | ||
257 | bad: | |
258 | return -EIO; | |
259 | } | |
260 | ||
6e8575fa SL |
261 | /* |
262 | * parse create results | |
263 | */ | |
264 | static int parse_reply_info_create(void **p, void *end, | |
265 | struct ceph_mds_reply_info_parsed *info, | |
12b4629a | 266 | u64 features) |
6e8575fa SL |
267 | { |
268 | if (features & CEPH_FEATURE_REPLY_CREATE_INODE) { | |
269 | if (*p == end) { | |
270 | info->has_create_ino = false; | |
271 | } else { | |
272 | info->has_create_ino = true; | |
273 | info->ino = ceph_decode_64(p); | |
274 | } | |
275 | } | |
276 | ||
277 | if (unlikely(*p != end)) | |
278 | goto bad; | |
279 | return 0; | |
280 | ||
281 | bad: | |
282 | return -EIO; | |
283 | } | |
284 | ||
25933abd HS |
285 | /* |
286 | * parse extra results | |
287 | */ | |
288 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 289 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 290 | u64 features) |
25933abd | 291 | { |
6df8c9d8 JL |
292 | u32 op = le32_to_cpu(info->head->op); |
293 | ||
294 | if (op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 295 | return parse_reply_info_filelock(p, end, info, features); |
6df8c9d8 | 296 | else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP) |
14303d20 | 297 | return parse_reply_info_dir(p, end, info, features); |
6df8c9d8 | 298 | else if (op == CEPH_MDS_OP_CREATE) |
6e8575fa SL |
299 | return parse_reply_info_create(p, end, info, features); |
300 | else | |
301 | return -EIO; | |
25933abd HS |
302 | } |
303 | ||
2f2dc053 SW |
304 | /* |
305 | * parse entire mds reply | |
306 | */ | |
307 | static int parse_reply_info(struct ceph_msg *msg, | |
14303d20 | 308 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 309 | u64 features) |
2f2dc053 SW |
310 | { |
311 | void *p, *end; | |
312 | u32 len; | |
313 | int err; | |
314 | ||
315 | info->head = msg->front.iov_base; | |
316 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
317 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
318 | ||
319 | /* trace */ | |
320 | ceph_decode_32_safe(&p, end, len, bad); | |
321 | if (len > 0) { | |
32852a81 | 322 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 323 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
324 | if (err < 0) |
325 | goto out_bad; | |
326 | } | |
327 | ||
25933abd | 328 | /* extra */ |
2f2dc053 SW |
329 | ceph_decode_32_safe(&p, end, len, bad); |
330 | if (len > 0) { | |
32852a81 | 331 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 332 | err = parse_reply_info_extra(&p, p+len, info, features); |
2f2dc053 SW |
333 | if (err < 0) |
334 | goto out_bad; | |
335 | } | |
336 | ||
337 | /* snap blob */ | |
338 | ceph_decode_32_safe(&p, end, len, bad); | |
339 | info->snapblob_len = len; | |
340 | info->snapblob = p; | |
341 | p += len; | |
342 | ||
343 | if (p != end) | |
344 | goto bad; | |
345 | return 0; | |
346 | ||
347 | bad: | |
348 | err = -EIO; | |
349 | out_bad: | |
350 | pr_err("mds parse_reply err %d\n", err); | |
351 | return err; | |
352 | } | |
353 | ||
354 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
355 | { | |
2a5beea3 | 356 | if (!info->dir_entries) |
54008399 | 357 | return; |
2a5beea3 | 358 | free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size)); |
2f2dc053 SW |
359 | } |
360 | ||
361 | ||
362 | /* | |
363 | * sessions | |
364 | */ | |
a687ecaf | 365 | const char *ceph_session_state_name(int s) |
2f2dc053 SW |
366 | { |
367 | switch (s) { | |
368 | case CEPH_MDS_SESSION_NEW: return "new"; | |
369 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
370 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
371 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
372 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
44ca18f2 | 373 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 | 374 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
fcff415c | 375 | case CEPH_MDS_SESSION_REJECTED: return "rejected"; |
2f2dc053 SW |
376 | default: return "???"; |
377 | } | |
378 | } | |
379 | ||
380 | static struct ceph_mds_session *get_session(struct ceph_mds_session *s) | |
381 | { | |
3997c01d | 382 | if (refcount_inc_not_zero(&s->s_ref)) { |
2f2dc053 | 383 | dout("mdsc get_session %p %d -> %d\n", s, |
3997c01d | 384 | refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref)); |
2f2dc053 SW |
385 | return s; |
386 | } else { | |
387 | dout("mdsc get_session %p 0 -- FAIL", s); | |
388 | return NULL; | |
389 | } | |
390 | } | |
391 | ||
392 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
393 | { | |
394 | dout("mdsc put_session %p %d -> %d\n", s, | |
3997c01d ER |
395 | refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1); |
396 | if (refcount_dec_and_test(&s->s_ref)) { | |
6c4a1915 | 397 | if (s->s_auth.authorizer) |
6c1ea260 | 398 | ceph_auth_destroy_authorizer(s->s_auth.authorizer); |
2f2dc053 | 399 | kfree(s); |
4e7a5dcd | 400 | } |
2f2dc053 SW |
401 | } |
402 | ||
403 | /* | |
404 | * called under mdsc->mutex | |
405 | */ | |
406 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
407 | int mds) | |
408 | { | |
409 | struct ceph_mds_session *session; | |
410 | ||
d37b1d99 | 411 | if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) |
2f2dc053 SW |
412 | return NULL; |
413 | session = mdsc->sessions[mds]; | |
414 | dout("lookup_mds_session %p %d\n", session, | |
3997c01d | 415 | refcount_read(&session->s_ref)); |
2f2dc053 SW |
416 | get_session(session); |
417 | return session; | |
418 | } | |
419 | ||
420 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
421 | { | |
422 | if (mds >= mdsc->max_sessions) | |
423 | return false; | |
424 | return mdsc->sessions[mds]; | |
425 | } | |
426 | ||
2600d2dd SW |
427 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
428 | struct ceph_mds_session *s) | |
429 | { | |
430 | if (s->s_mds >= mdsc->max_sessions || | |
431 | mdsc->sessions[s->s_mds] != s) | |
432 | return -ENOENT; | |
433 | return 0; | |
434 | } | |
435 | ||
2f2dc053 SW |
436 | /* |
437 | * create+register a new session for given mds. | |
438 | * called under mdsc->mutex. | |
439 | */ | |
440 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
441 | int mds) | |
442 | { | |
443 | struct ceph_mds_session *s; | |
444 | ||
76201b63 | 445 | if (mds >= mdsc->mdsmap->m_num_mds) |
c338c07c NY |
446 | return ERR_PTR(-EINVAL); |
447 | ||
2f2dc053 | 448 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
449 | if (!s) |
450 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
451 | s->s_mdsc = mdsc; |
452 | s->s_mds = mds; | |
453 | s->s_state = CEPH_MDS_SESSION_NEW; | |
454 | s->s_ttl = 0; | |
455 | s->s_seq = 0; | |
456 | mutex_init(&s->s_mutex); | |
457 | ||
b7a9e5dd | 458 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 459 | |
d8fb02ab | 460 | spin_lock_init(&s->s_gen_ttl_lock); |
2f2dc053 | 461 | s->s_cap_gen = 0; |
1ce208a6 | 462 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
463 | |
464 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 SW |
465 | s->s_renew_requested = 0; |
466 | s->s_renew_seq = 0; | |
467 | INIT_LIST_HEAD(&s->s_caps); | |
468 | s->s_nr_caps = 0; | |
5dacf091 | 469 | s->s_trim_caps = 0; |
3997c01d | 470 | refcount_set(&s->s_ref, 1); |
2f2dc053 SW |
471 | INIT_LIST_HEAD(&s->s_waiting); |
472 | INIT_LIST_HEAD(&s->s_unsafe); | |
473 | s->s_num_cap_releases = 0; | |
99a9c273 | 474 | s->s_cap_reconnect = 0; |
7c1332b8 | 475 | s->s_cap_iterator = NULL; |
2f2dc053 | 476 | INIT_LIST_HEAD(&s->s_cap_releases); |
2f2dc053 | 477 | INIT_LIST_HEAD(&s->s_cap_flushing); |
2f2dc053 SW |
478 | |
479 | dout("register_session mds%d\n", mds); | |
480 | if (mds >= mdsc->max_sessions) { | |
481 | int newmax = 1 << get_count_order(mds+1); | |
482 | struct ceph_mds_session **sa; | |
483 | ||
484 | dout("register_session realloc to %d\n", newmax); | |
485 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
d37b1d99 | 486 | if (!sa) |
42ce56e5 | 487 | goto fail_realloc; |
2f2dc053 SW |
488 | if (mdsc->sessions) { |
489 | memcpy(sa, mdsc->sessions, | |
490 | mdsc->max_sessions * sizeof(void *)); | |
491 | kfree(mdsc->sessions); | |
492 | } | |
493 | mdsc->sessions = sa; | |
494 | mdsc->max_sessions = newmax; | |
495 | } | |
496 | mdsc->sessions[mds] = s; | |
86d8f67b | 497 | atomic_inc(&mdsc->num_sessions); |
3997c01d | 498 | refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */ |
42ce56e5 | 499 | |
b7a9e5dd SW |
500 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
501 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 502 | |
2f2dc053 | 503 | return s; |
42ce56e5 SW |
504 | |
505 | fail_realloc: | |
506 | kfree(s); | |
507 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
508 | } |
509 | ||
510 | /* | |
511 | * called under mdsc->mutex | |
512 | */ | |
2600d2dd | 513 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 514 | struct ceph_mds_session *s) |
2f2dc053 | 515 | { |
2600d2dd SW |
516 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
517 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
518 | mdsc->sessions[s->s_mds] = NULL; |
519 | ceph_con_close(&s->s_con); | |
520 | ceph_put_mds_session(s); | |
86d8f67b | 521 | atomic_dec(&mdsc->num_sessions); |
2f2dc053 SW |
522 | } |
523 | ||
524 | /* | |
525 | * drop session refs in request. | |
526 | * | |
527 | * should be last request ref, or hold mdsc->mutex | |
528 | */ | |
529 | static void put_request_session(struct ceph_mds_request *req) | |
530 | { | |
531 | if (req->r_session) { | |
532 | ceph_put_mds_session(req->r_session); | |
533 | req->r_session = NULL; | |
534 | } | |
535 | } | |
536 | ||
153c8e6b | 537 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 538 | { |
153c8e6b SW |
539 | struct ceph_mds_request *req = container_of(kref, |
540 | struct ceph_mds_request, | |
541 | r_kref); | |
54008399 | 542 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
543 | if (req->r_request) |
544 | ceph_msg_put(req->r_request); | |
54008399 | 545 | if (req->r_reply) |
153c8e6b | 546 | ceph_msg_put(req->r_reply); |
153c8e6b | 547 | if (req->r_inode) { |
41b02e1f | 548 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
153c8e6b SW |
549 | iput(req->r_inode); |
550 | } | |
3dd69aab JL |
551 | if (req->r_parent) |
552 | ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN); | |
e96a650a | 553 | iput(req->r_target_inode); |
153c8e6b SW |
554 | if (req->r_dentry) |
555 | dput(req->r_dentry); | |
844d87c3 SW |
556 | if (req->r_old_dentry) |
557 | dput(req->r_old_dentry); | |
558 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
559 | /* |
560 | * track (and drop pins for) r_old_dentry_dir | |
561 | * separately, since r_old_dentry's d_parent may have | |
562 | * changed between the dir mutex being dropped and | |
563 | * this request being freed. | |
564 | */ | |
565 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
566 | CEPH_CAP_PIN); | |
41b02e1f | 567 | iput(req->r_old_dentry_dir); |
2f2dc053 | 568 | } |
153c8e6b SW |
569 | kfree(req->r_path1); |
570 | kfree(req->r_path2); | |
25e6bae3 YZ |
571 | if (req->r_pagelist) |
572 | ceph_pagelist_release(req->r_pagelist); | |
153c8e6b | 573 | put_request_session(req); |
37151668 | 574 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
153c8e6b | 575 | kfree(req); |
2f2dc053 SW |
576 | } |
577 | ||
fcd00b68 ID |
578 | DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node) |
579 | ||
2f2dc053 SW |
580 | /* |
581 | * lookup session, bump ref if found. | |
582 | * | |
583 | * called under mdsc->mutex. | |
584 | */ | |
fcd00b68 ID |
585 | static struct ceph_mds_request * |
586 | lookup_get_request(struct ceph_mds_client *mdsc, u64 tid) | |
2f2dc053 SW |
587 | { |
588 | struct ceph_mds_request *req; | |
44ca18f2 | 589 | |
fcd00b68 ID |
590 | req = lookup_request(&mdsc->request_tree, tid); |
591 | if (req) | |
592 | ceph_mdsc_get_request(req); | |
44ca18f2 | 593 | |
fcd00b68 | 594 | return req; |
2f2dc053 SW |
595 | } |
596 | ||
597 | /* | |
598 | * Register an in-flight request, and assign a tid. Link to directory | |
599 | * are modifying (if any). | |
600 | * | |
601 | * Called under mdsc->mutex. | |
602 | */ | |
603 | static void __register_request(struct ceph_mds_client *mdsc, | |
604 | struct ceph_mds_request *req, | |
605 | struct inode *dir) | |
606 | { | |
607 | req->r_tid = ++mdsc->last_tid; | |
608 | if (req->r_num_caps) | |
37151668 YS |
609 | ceph_reserve_caps(mdsc, &req->r_caps_reservation, |
610 | req->r_num_caps); | |
2f2dc053 SW |
611 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
612 | ceph_mdsc_get_request(req); | |
fcd00b68 | 613 | insert_request(&mdsc->request_tree, req); |
2f2dc053 | 614 | |
cb4276cc SW |
615 | req->r_uid = current_fsuid(); |
616 | req->r_gid = current_fsgid(); | |
617 | ||
e8a7b8b1 YZ |
618 | if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) |
619 | mdsc->oldest_tid = req->r_tid; | |
620 | ||
2f2dc053 | 621 | if (dir) { |
3b663780 | 622 | ihold(dir); |
2f2dc053 | 623 | req->r_unsafe_dir = dir; |
2f2dc053 SW |
624 | } |
625 | } | |
626 | ||
627 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
628 | struct ceph_mds_request *req) | |
629 | { | |
630 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
e8a7b8b1 | 631 | |
df963ea8 JL |
632 | /* Never leave an unregistered request on an unsafe list! */ |
633 | list_del_init(&req->r_unsafe_item); | |
634 | ||
e8a7b8b1 YZ |
635 | if (req->r_tid == mdsc->oldest_tid) { |
636 | struct rb_node *p = rb_next(&req->r_node); | |
637 | mdsc->oldest_tid = 0; | |
638 | while (p) { | |
639 | struct ceph_mds_request *next_req = | |
640 | rb_entry(p, struct ceph_mds_request, r_node); | |
641 | if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { | |
642 | mdsc->oldest_tid = next_req->r_tid; | |
643 | break; | |
644 | } | |
645 | p = rb_next(p); | |
646 | } | |
647 | } | |
648 | ||
fcd00b68 | 649 | erase_request(&mdsc->request_tree, req); |
2f2dc053 | 650 | |
bc2de10d JL |
651 | if (req->r_unsafe_dir && |
652 | test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { | |
2f2dc053 | 653 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); |
2f2dc053 SW |
654 | spin_lock(&ci->i_unsafe_lock); |
655 | list_del_init(&req->r_unsafe_dir_item); | |
656 | spin_unlock(&ci->i_unsafe_lock); | |
4c06ace8 | 657 | } |
bc2de10d JL |
658 | if (req->r_target_inode && |
659 | test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { | |
68cd5b4b YZ |
660 | struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); |
661 | spin_lock(&ci->i_unsafe_lock); | |
662 | list_del_init(&req->r_unsafe_target_item); | |
663 | spin_unlock(&ci->i_unsafe_lock); | |
664 | } | |
3b663780 | 665 | |
4c06ace8 | 666 | if (req->r_unsafe_dir) { |
3b663780 SW |
667 | iput(req->r_unsafe_dir); |
668 | req->r_unsafe_dir = NULL; | |
2f2dc053 | 669 | } |
94aa8ae1 | 670 | |
fc55d2c9 YZ |
671 | complete_all(&req->r_safe_completion); |
672 | ||
94aa8ae1 | 673 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
674 | } |
675 | ||
30c71233 JL |
676 | /* |
677 | * Walk back up the dentry tree until we hit a dentry representing a | |
678 | * non-snapshot inode. We do this using the rcu_read_lock (which must be held | |
679 | * when calling this) to ensure that the objects won't disappear while we're | |
680 | * working with them. Once we hit a candidate dentry, we attempt to take a | |
681 | * reference to it, and return that as the result. | |
682 | */ | |
f1075480 DC |
683 | static struct inode *get_nonsnap_parent(struct dentry *dentry) |
684 | { | |
685 | struct inode *inode = NULL; | |
30c71233 JL |
686 | |
687 | while (dentry && !IS_ROOT(dentry)) { | |
688 | inode = d_inode_rcu(dentry); | |
689 | if (!inode || ceph_snap(inode) == CEPH_NOSNAP) | |
690 | break; | |
691 | dentry = dentry->d_parent; | |
692 | } | |
693 | if (inode) | |
694 | inode = igrab(inode); | |
695 | return inode; | |
696 | } | |
697 | ||
2f2dc053 SW |
698 | /* |
699 | * Choose mds to send request to next. If there is a hint set in the | |
700 | * request (e.g., due to a prior forward hint from the mds), use that. | |
701 | * Otherwise, consult frag tree and/or caps to identify the | |
702 | * appropriate mds. If all else fails, choose randomly. | |
703 | * | |
704 | * Called under mdsc->mutex. | |
705 | */ | |
706 | static int __choose_mds(struct ceph_mds_client *mdsc, | |
707 | struct ceph_mds_request *req) | |
708 | { | |
709 | struct inode *inode; | |
710 | struct ceph_inode_info *ci; | |
711 | struct ceph_cap *cap; | |
712 | int mode = req->r_direct_mode; | |
713 | int mds = -1; | |
714 | u32 hash = req->r_direct_hash; | |
bc2de10d | 715 | bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); |
2f2dc053 SW |
716 | |
717 | /* | |
718 | * is there a specific mds we should try? ignore hint if we have | |
719 | * no session and the mds is not up (active or recovering). | |
720 | */ | |
721 | if (req->r_resend_mds >= 0 && | |
722 | (__have_session(mdsc, req->r_resend_mds) || | |
723 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
724 | dout("choose_mds using resend_mds mds%d\n", | |
725 | req->r_resend_mds); | |
726 | return req->r_resend_mds; | |
727 | } | |
728 | ||
729 | if (mode == USE_RANDOM_MDS) | |
730 | goto random; | |
731 | ||
732 | inode = NULL; | |
733 | if (req->r_inode) { | |
5d37ca14 YZ |
734 | if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) { |
735 | inode = req->r_inode; | |
736 | ihold(inode); | |
737 | } else { | |
38f340cc YZ |
738 | /* req->r_dentry is non-null for LSSNAP request */ |
739 | rcu_read_lock(); | |
740 | inode = get_nonsnap_parent(req->r_dentry); | |
741 | rcu_read_unlock(); | |
742 | dout("__choose_mds using snapdir's parent %p\n", inode); | |
5d37ca14 | 743 | } |
38f340cc | 744 | } else if (req->r_dentry) { |
d79698da | 745 | /* ignore race with rename; old or new d_parent is okay */ |
30c71233 JL |
746 | struct dentry *parent; |
747 | struct inode *dir; | |
748 | ||
749 | rcu_read_lock(); | |
750 | parent = req->r_dentry->d_parent; | |
3dd69aab | 751 | dir = req->r_parent ? : d_inode_rcu(parent); |
eb6bb1c5 | 752 | |
30c71233 JL |
753 | if (!dir || dir->i_sb != mdsc->fsc->sb) { |
754 | /* not this fs or parent went negative */ | |
2b0143b5 | 755 | inode = d_inode(req->r_dentry); |
30c71233 JL |
756 | if (inode) |
757 | ihold(inode); | |
eb6bb1c5 SW |
758 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { |
759 | /* direct snapped/virtual snapdir requests | |
760 | * based on parent dir inode */ | |
30c71233 | 761 | inode = get_nonsnap_parent(parent); |
eb6bb1c5 | 762 | dout("__choose_mds using nonsnap parent %p\n", inode); |
ca18bede | 763 | } else { |
eb6bb1c5 | 764 | /* dentry target */ |
2b0143b5 | 765 | inode = d_inode(req->r_dentry); |
ca18bede YZ |
766 | if (!inode || mode == USE_AUTH_MDS) { |
767 | /* dir + name */ | |
30c71233 | 768 | inode = igrab(dir); |
ca18bede YZ |
769 | hash = ceph_dentry_hash(dir, req->r_dentry); |
770 | is_hash = true; | |
30c71233 JL |
771 | } else { |
772 | ihold(inode); | |
ca18bede | 773 | } |
2f2dc053 | 774 | } |
30c71233 | 775 | rcu_read_unlock(); |
2f2dc053 | 776 | } |
eb6bb1c5 | 777 | |
2f2dc053 SW |
778 | dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash, |
779 | (int)hash, mode); | |
780 | if (!inode) | |
781 | goto random; | |
782 | ci = ceph_inode(inode); | |
783 | ||
784 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
785 | struct ceph_inode_frag frag; | |
786 | int found; | |
787 | ||
788 | ceph_choose_frag(ci, hash, &frag, &found); | |
789 | if (found) { | |
790 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
791 | u8 r; | |
792 | ||
793 | /* choose a random replica */ | |
794 | get_random_bytes(&r, 1); | |
795 | r %= frag.ndist; | |
796 | mds = frag.dist[r]; | |
797 | dout("choose_mds %p %llx.%llx " | |
798 | "frag %u mds%d (%d/%d)\n", | |
799 | inode, ceph_vinop(inode), | |
d66bbd44 | 800 | frag.frag, mds, |
2f2dc053 | 801 | (int)r, frag.ndist); |
d66bbd44 SW |
802 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
803 | CEPH_MDS_STATE_ACTIVE) | |
30c71233 | 804 | goto out; |
2f2dc053 SW |
805 | } |
806 | ||
807 | /* since this file/dir wasn't known to be | |
808 | * replicated, then we want to look for the | |
809 | * authoritative mds. */ | |
810 | mode = USE_AUTH_MDS; | |
811 | if (frag.mds >= 0) { | |
812 | /* choose auth mds */ | |
813 | mds = frag.mds; | |
814 | dout("choose_mds %p %llx.%llx " | |
815 | "frag %u mds%d (auth)\n", | |
816 | inode, ceph_vinop(inode), frag.frag, mds); | |
d66bbd44 SW |
817 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
818 | CEPH_MDS_STATE_ACTIVE) | |
30c71233 | 819 | goto out; |
2f2dc053 SW |
820 | } |
821 | } | |
822 | } | |
823 | ||
be655596 | 824 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
825 | cap = NULL; |
826 | if (mode == USE_AUTH_MDS) | |
827 | cap = ci->i_auth_cap; | |
828 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
829 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
830 | if (!cap) { | |
be655596 | 831 | spin_unlock(&ci->i_ceph_lock); |
30c71233 | 832 | iput(inode); |
2f2dc053 SW |
833 | goto random; |
834 | } | |
835 | mds = cap->session->s_mds; | |
836 | dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n", | |
837 | inode, ceph_vinop(inode), mds, | |
838 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 839 | spin_unlock(&ci->i_ceph_lock); |
30c71233 JL |
840 | out: |
841 | iput(inode); | |
2f2dc053 SW |
842 | return mds; |
843 | ||
844 | random: | |
845 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); | |
846 | dout("choose_mds chose random mds%d\n", mds); | |
847 | return mds; | |
848 | } | |
849 | ||
850 | ||
851 | /* | |
852 | * session messages | |
853 | */ | |
854 | static struct ceph_msg *create_session_msg(u32 op, u64 seq) | |
855 | { | |
856 | struct ceph_msg *msg; | |
857 | struct ceph_mds_session_head *h; | |
858 | ||
b61c2763 SW |
859 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
860 | false); | |
a79832f2 | 861 | if (!msg) { |
2f2dc053 | 862 | pr_err("create_session_msg ENOMEM creating msg\n"); |
a79832f2 | 863 | return NULL; |
2f2dc053 SW |
864 | } |
865 | h = msg->front.iov_base; | |
866 | h->op = cpu_to_le32(op); | |
867 | h->seq = cpu_to_le64(seq); | |
dbd0c8bf JS |
868 | |
869 | return msg; | |
870 | } | |
871 | ||
872 | /* | |
873 | * session message, specialization for CEPH_SESSION_REQUEST_OPEN | |
874 | * to include additional client metadata fields. | |
875 | */ | |
876 | static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) | |
877 | { | |
878 | struct ceph_msg *msg; | |
879 | struct ceph_mds_session_head *h; | |
880 | int i = -1; | |
881 | int metadata_bytes = 0; | |
882 | int metadata_key_count = 0; | |
883 | struct ceph_options *opt = mdsc->fsc->client->options; | |
3f384954 | 884 | struct ceph_mount_options *fsopt = mdsc->fsc->mount_options; |
dbd0c8bf JS |
885 | void *p; |
886 | ||
a6a5ce4f | 887 | const char* metadata[][2] = { |
717e6f28 YZ |
888 | {"hostname", mdsc->nodename}, |
889 | {"kernel_version", init_utsname()->release}, | |
3f384954 YZ |
890 | {"entity_id", opt->name ? : ""}, |
891 | {"root", fsopt->server_path ? : "/"}, | |
dbd0c8bf JS |
892 | {NULL, NULL} |
893 | }; | |
894 | ||
895 | /* Calculate serialized length of metadata */ | |
896 | metadata_bytes = 4; /* map length */ | |
d37b1d99 | 897 | for (i = 0; metadata[i][0]; ++i) { |
dbd0c8bf JS |
898 | metadata_bytes += 8 + strlen(metadata[i][0]) + |
899 | strlen(metadata[i][1]); | |
900 | metadata_key_count++; | |
901 | } | |
902 | ||
903 | /* Allocate the message */ | |
904 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes, | |
905 | GFP_NOFS, false); | |
906 | if (!msg) { | |
907 | pr_err("create_session_msg ENOMEM creating msg\n"); | |
908 | return NULL; | |
909 | } | |
910 | h = msg->front.iov_base; | |
911 | h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); | |
912 | h->seq = cpu_to_le64(seq); | |
913 | ||
914 | /* | |
915 | * Serialize client metadata into waiting buffer space, using | |
916 | * the format that userspace expects for map<string, string> | |
7cfa0313 JS |
917 | * |
918 | * ClientSession messages with metadata are v2 | |
dbd0c8bf | 919 | */ |
7cfa0313 JS |
920 | msg->hdr.version = cpu_to_le16(2); |
921 | msg->hdr.compat_version = cpu_to_le16(1); | |
dbd0c8bf JS |
922 | |
923 | /* The write pointer, following the session_head structure */ | |
924 | p = msg->front.iov_base + sizeof(*h); | |
925 | ||
926 | /* Number of entries in the map */ | |
927 | ceph_encode_32(&p, metadata_key_count); | |
928 | ||
929 | /* Two length-prefixed strings for each entry in the map */ | |
d37b1d99 | 930 | for (i = 0; metadata[i][0]; ++i) { |
dbd0c8bf JS |
931 | size_t const key_len = strlen(metadata[i][0]); |
932 | size_t const val_len = strlen(metadata[i][1]); | |
933 | ||
934 | ceph_encode_32(&p, key_len); | |
935 | memcpy(p, metadata[i][0], key_len); | |
936 | p += key_len; | |
937 | ceph_encode_32(&p, val_len); | |
938 | memcpy(p, metadata[i][1], val_len); | |
939 | p += val_len; | |
940 | } | |
941 | ||
2f2dc053 SW |
942 | return msg; |
943 | } | |
944 | ||
945 | /* | |
946 | * send session open request. | |
947 | * | |
948 | * called under mdsc->mutex | |
949 | */ | |
950 | static int __open_session(struct ceph_mds_client *mdsc, | |
951 | struct ceph_mds_session *session) | |
952 | { | |
953 | struct ceph_msg *msg; | |
954 | int mstate; | |
955 | int mds = session->s_mds; | |
2f2dc053 SW |
956 | |
957 | /* wait for mds to go active? */ | |
958 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
959 | dout("open_session to mds%d (%s)\n", mds, | |
960 | ceph_mds_state_name(mstate)); | |
961 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
962 | session->s_renew_requested = jiffies; | |
963 | ||
964 | /* send connect message */ | |
dbd0c8bf | 965 | msg = create_session_open_msg(mdsc, session->s_seq); |
a79832f2 SW |
966 | if (!msg) |
967 | return -ENOMEM; | |
2f2dc053 | 968 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
969 | return 0; |
970 | } | |
971 | ||
ed0552a1 SW |
972 | /* |
973 | * open sessions for any export targets for the given mds | |
974 | * | |
975 | * called under mdsc->mutex | |
976 | */ | |
5d72d13c YZ |
977 | static struct ceph_mds_session * |
978 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
979 | { | |
980 | struct ceph_mds_session *session; | |
981 | ||
982 | session = __ceph_lookup_mds_session(mdsc, target); | |
983 | if (!session) { | |
984 | session = register_session(mdsc, target); | |
985 | if (IS_ERR(session)) | |
986 | return session; | |
987 | } | |
988 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
989 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
990 | __open_session(mdsc, session); | |
991 | ||
992 | return session; | |
993 | } | |
994 | ||
995 | struct ceph_mds_session * | |
996 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
997 | { | |
998 | struct ceph_mds_session *session; | |
999 | ||
1000 | dout("open_export_target_session to mds%d\n", target); | |
1001 | ||
1002 | mutex_lock(&mdsc->mutex); | |
1003 | session = __open_export_target_session(mdsc, target); | |
1004 | mutex_unlock(&mdsc->mutex); | |
1005 | ||
1006 | return session; | |
1007 | } | |
1008 | ||
ed0552a1 SW |
1009 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
1010 | struct ceph_mds_session *session) | |
1011 | { | |
1012 | struct ceph_mds_info *mi; | |
1013 | struct ceph_mds_session *ts; | |
1014 | int i, mds = session->s_mds; | |
ed0552a1 | 1015 | |
76201b63 | 1016 | if (mds >= mdsc->mdsmap->m_num_mds) |
ed0552a1 | 1017 | return; |
5d72d13c | 1018 | |
ed0552a1 SW |
1019 | mi = &mdsc->mdsmap->m_info[mds]; |
1020 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
1021 | session->s_mds, mi->num_export_targets); | |
1022 | ||
1023 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c YZ |
1024 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
1025 | if (!IS_ERR(ts)) | |
1026 | ceph_put_mds_session(ts); | |
ed0552a1 SW |
1027 | } |
1028 | } | |
1029 | ||
154f42c2 SW |
1030 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
1031 | struct ceph_mds_session *session) | |
1032 | { | |
1033 | mutex_lock(&mdsc->mutex); | |
1034 | __open_export_target_sessions(mdsc, session); | |
1035 | mutex_unlock(&mdsc->mutex); | |
1036 | } | |
1037 | ||
2f2dc053 SW |
1038 | /* |
1039 | * session caps | |
1040 | */ | |
1041 | ||
c8a96a31 JL |
1042 | static void detach_cap_releases(struct ceph_mds_session *session, |
1043 | struct list_head *target) | |
2f2dc053 | 1044 | { |
c8a96a31 JL |
1045 | lockdep_assert_held(&session->s_cap_lock); |
1046 | ||
1047 | list_splice_init(&session->s_cap_releases, target); | |
745a8e3b | 1048 | session->s_num_cap_releases = 0; |
c8a96a31 JL |
1049 | dout("dispose_cap_releases mds%d\n", session->s_mds); |
1050 | } | |
2f2dc053 | 1051 | |
c8a96a31 JL |
1052 | static void dispose_cap_releases(struct ceph_mds_client *mdsc, |
1053 | struct list_head *dispose) | |
1054 | { | |
1055 | while (!list_empty(dispose)) { | |
745a8e3b YZ |
1056 | struct ceph_cap *cap; |
1057 | /* zero out the in-progress message */ | |
c8a96a31 | 1058 | cap = list_first_entry(dispose, struct ceph_cap, session_caps); |
745a8e3b YZ |
1059 | list_del(&cap->session_caps); |
1060 | ceph_put_cap(mdsc, cap); | |
2f2dc053 | 1061 | } |
2f2dc053 SW |
1062 | } |
1063 | ||
1c841a96 YZ |
1064 | static void cleanup_session_requests(struct ceph_mds_client *mdsc, |
1065 | struct ceph_mds_session *session) | |
1066 | { | |
1067 | struct ceph_mds_request *req; | |
1068 | struct rb_node *p; | |
1069 | ||
1070 | dout("cleanup_session_requests mds%d\n", session->s_mds); | |
1071 | mutex_lock(&mdsc->mutex); | |
1072 | while (!list_empty(&session->s_unsafe)) { | |
1073 | req = list_first_entry(&session->s_unsafe, | |
1074 | struct ceph_mds_request, r_unsafe_item); | |
3e0708b9 YZ |
1075 | pr_warn_ratelimited(" dropping unsafe request %llu\n", |
1076 | req->r_tid); | |
1c841a96 YZ |
1077 | __unregister_request(mdsc, req); |
1078 | } | |
1079 | /* zero r_attempts, so kick_requests() will re-send requests */ | |
1080 | p = rb_first(&mdsc->request_tree); | |
1081 | while (p) { | |
1082 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
1083 | p = rb_next(p); | |
1084 | if (req->r_session && | |
1085 | req->r_session->s_mds == session->s_mds) | |
1086 | req->r_attempts = 0; | |
1087 | } | |
1088 | mutex_unlock(&mdsc->mutex); | |
1089 | } | |
1090 | ||
2f2dc053 | 1091 | /* |
f818a736 SW |
1092 | * Helper to safely iterate over all caps associated with a session, with |
1093 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 1094 | * |
f818a736 | 1095 | * Caller must hold session s_mutex. |
2f2dc053 SW |
1096 | */ |
1097 | static int iterate_session_caps(struct ceph_mds_session *session, | |
1098 | int (*cb)(struct inode *, struct ceph_cap *, | |
1099 | void *), void *arg) | |
1100 | { | |
7c1332b8 SW |
1101 | struct list_head *p; |
1102 | struct ceph_cap *cap; | |
1103 | struct inode *inode, *last_inode = NULL; | |
1104 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
1105 | int ret; |
1106 | ||
1107 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
1108 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
1109 | p = session->s_caps.next; |
1110 | while (p != &session->s_caps) { | |
1111 | cap = list_entry(p, struct ceph_cap, session_caps); | |
2f2dc053 | 1112 | inode = igrab(&cap->ci->vfs_inode); |
7c1332b8 SW |
1113 | if (!inode) { |
1114 | p = p->next; | |
2f2dc053 | 1115 | continue; |
7c1332b8 SW |
1116 | } |
1117 | session->s_cap_iterator = cap; | |
2f2dc053 | 1118 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1119 | |
1120 | if (last_inode) { | |
1121 | iput(last_inode); | |
1122 | last_inode = NULL; | |
1123 | } | |
1124 | if (old_cap) { | |
37151668 | 1125 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
1126 | old_cap = NULL; |
1127 | } | |
1128 | ||
2f2dc053 | 1129 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
1130 | last_inode = inode; |
1131 | ||
2f2dc053 | 1132 | spin_lock(&session->s_cap_lock); |
7c1332b8 | 1133 | p = p->next; |
d37b1d99 | 1134 | if (!cap->ci) { |
7c1332b8 SW |
1135 | dout("iterate_session_caps finishing cap %p removal\n", |
1136 | cap); | |
1137 | BUG_ON(cap->session != session); | |
745a8e3b | 1138 | cap->session = NULL; |
7c1332b8 SW |
1139 | list_del_init(&cap->session_caps); |
1140 | session->s_nr_caps--; | |
745a8e3b YZ |
1141 | if (cap->queue_release) { |
1142 | list_add_tail(&cap->session_caps, | |
1143 | &session->s_cap_releases); | |
1144 | session->s_num_cap_releases++; | |
1145 | } else { | |
1146 | old_cap = cap; /* put_cap it w/o locks held */ | |
1147 | } | |
7c1332b8 | 1148 | } |
5dacf091 SW |
1149 | if (ret < 0) |
1150 | goto out; | |
2f2dc053 | 1151 | } |
5dacf091 SW |
1152 | ret = 0; |
1153 | out: | |
7c1332b8 | 1154 | session->s_cap_iterator = NULL; |
2f2dc053 | 1155 | spin_unlock(&session->s_cap_lock); |
7c1332b8 | 1156 | |
e96a650a | 1157 | iput(last_inode); |
7c1332b8 | 1158 | if (old_cap) |
37151668 | 1159 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1160 | |
5dacf091 | 1161 | return ret; |
2f2dc053 SW |
1162 | } |
1163 | ||
1164 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1165 | void *arg) |
2f2dc053 | 1166 | { |
6c93df5d | 1167 | struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg; |
2f2dc053 | 1168 | struct ceph_inode_info *ci = ceph_inode(inode); |
553adfd9 | 1169 | LIST_HEAD(to_remove); |
6c93df5d YZ |
1170 | bool drop = false; |
1171 | bool invalidate = false; | |
6c99f254 | 1172 | |
2f2dc053 SW |
1173 | dout("removing cap %p, ci is %p, inode is %p\n", |
1174 | cap, ci, &ci->vfs_inode); | |
be655596 | 1175 | spin_lock(&ci->i_ceph_lock); |
a096b09a | 1176 | __ceph_remove_cap(cap, false); |
571ade33 | 1177 | if (!ci->i_auth_cap) { |
553adfd9 | 1178 | struct ceph_cap_flush *cf; |
6c93df5d | 1179 | struct ceph_mds_client *mdsc = fsc->mdsc; |
6c99f254 | 1180 | |
77310320 YZ |
1181 | ci->i_ceph_flags |= CEPH_I_CAP_DROPPED; |
1182 | ||
6c93df5d | 1183 | if (ci->i_wrbuffer_ref > 0 && |
52953d55 | 1184 | READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
6c93df5d YZ |
1185 | invalidate = true; |
1186 | ||
e4500b5e YZ |
1187 | while (!list_empty(&ci->i_cap_flush_list)) { |
1188 | cf = list_first_entry(&ci->i_cap_flush_list, | |
1189 | struct ceph_cap_flush, i_list); | |
8cdcc07d | 1190 | list_move(&cf->i_list, &to_remove); |
553adfd9 YZ |
1191 | } |
1192 | ||
6c99f254 | 1193 | spin_lock(&mdsc->cap_dirty_lock); |
8310b089 | 1194 | |
e4500b5e YZ |
1195 | list_for_each_entry(cf, &to_remove, i_list) |
1196 | list_del(&cf->g_list); | |
8310b089 | 1197 | |
6c99f254 | 1198 | if (!list_empty(&ci->i_dirty_item)) { |
3e0708b9 YZ |
1199 | pr_warn_ratelimited( |
1200 | " dropping dirty %s state for %p %lld\n", | |
6c99f254 SW |
1201 | ceph_cap_string(ci->i_dirty_caps), |
1202 | inode, ceph_ino(inode)); | |
1203 | ci->i_dirty_caps = 0; | |
1204 | list_del_init(&ci->i_dirty_item); | |
6c93df5d | 1205 | drop = true; |
6c99f254 SW |
1206 | } |
1207 | if (!list_empty(&ci->i_flushing_item)) { | |
3e0708b9 YZ |
1208 | pr_warn_ratelimited( |
1209 | " dropping dirty+flushing %s state for %p %lld\n", | |
6c99f254 SW |
1210 | ceph_cap_string(ci->i_flushing_caps), |
1211 | inode, ceph_ino(inode)); | |
1212 | ci->i_flushing_caps = 0; | |
1213 | list_del_init(&ci->i_flushing_item); | |
1214 | mdsc->num_cap_flushing--; | |
6c93df5d | 1215 | drop = true; |
6c99f254 | 1216 | } |
6c99f254 | 1217 | spin_unlock(&mdsc->cap_dirty_lock); |
553adfd9 | 1218 | |
b3f8d68f YZ |
1219 | if (atomic_read(&ci->i_filelock_ref) > 0) { |
1220 | /* make further file lock syscall return -EIO */ | |
1221 | ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK; | |
1222 | pr_warn_ratelimited(" dropping file locks for %p %lld\n", | |
1223 | inode, ceph_ino(inode)); | |
1224 | } | |
1225 | ||
f66fd9f0 | 1226 | if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) { |
e4500b5e | 1227 | list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove); |
f66fd9f0 YZ |
1228 | ci->i_prealloc_cap_flush = NULL; |
1229 | } | |
6c99f254 | 1230 | } |
be655596 | 1231 | spin_unlock(&ci->i_ceph_lock); |
553adfd9 YZ |
1232 | while (!list_empty(&to_remove)) { |
1233 | struct ceph_cap_flush *cf; | |
1234 | cf = list_first_entry(&to_remove, | |
e4500b5e YZ |
1235 | struct ceph_cap_flush, i_list); |
1236 | list_del(&cf->i_list); | |
f66fd9f0 | 1237 | ceph_free_cap_flush(cf); |
553adfd9 | 1238 | } |
77310320 YZ |
1239 | |
1240 | wake_up_all(&ci->i_cap_wq); | |
6c93df5d YZ |
1241 | if (invalidate) |
1242 | ceph_queue_invalidate(inode); | |
77310320 | 1243 | if (drop) |
6c99f254 | 1244 | iput(inode); |
2f2dc053 SW |
1245 | return 0; |
1246 | } | |
1247 | ||
1248 | /* | |
1249 | * caller must hold session s_mutex | |
1250 | */ | |
1251 | static void remove_session_caps(struct ceph_mds_session *session) | |
1252 | { | |
6c93df5d YZ |
1253 | struct ceph_fs_client *fsc = session->s_mdsc->fsc; |
1254 | struct super_block *sb = fsc->sb; | |
c8a96a31 JL |
1255 | LIST_HEAD(dispose); |
1256 | ||
2f2dc053 | 1257 | dout("remove_session_caps on %p\n", session); |
6c93df5d | 1258 | iterate_session_caps(session, remove_session_caps_cb, fsc); |
6f60f889 | 1259 | |
c8799fc4 YZ |
1260 | wake_up_all(&fsc->mdsc->cap_flushing_wq); |
1261 | ||
6f60f889 YZ |
1262 | spin_lock(&session->s_cap_lock); |
1263 | if (session->s_nr_caps > 0) { | |
6f60f889 YZ |
1264 | struct inode *inode; |
1265 | struct ceph_cap *cap, *prev = NULL; | |
1266 | struct ceph_vino vino; | |
1267 | /* | |
1268 | * iterate_session_caps() skips inodes that are being | |
1269 | * deleted, we need to wait until deletions are complete. | |
1270 | * __wait_on_freeing_inode() is designed for the job, | |
1271 | * but it is not exported, so use lookup inode function | |
1272 | * to access it. | |
1273 | */ | |
1274 | while (!list_empty(&session->s_caps)) { | |
1275 | cap = list_entry(session->s_caps.next, | |
1276 | struct ceph_cap, session_caps); | |
1277 | if (cap == prev) | |
1278 | break; | |
1279 | prev = cap; | |
1280 | vino = cap->ci->i_vino; | |
1281 | spin_unlock(&session->s_cap_lock); | |
1282 | ||
ed284c49 | 1283 | inode = ceph_find_inode(sb, vino); |
6f60f889 YZ |
1284 | iput(inode); |
1285 | ||
1286 | spin_lock(&session->s_cap_lock); | |
1287 | } | |
1288 | } | |
745a8e3b YZ |
1289 | |
1290 | // drop cap expires and unlock s_cap_lock | |
c8a96a31 | 1291 | detach_cap_releases(session, &dispose); |
6f60f889 | 1292 | |
2f2dc053 | 1293 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1294 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
c8a96a31 JL |
1295 | spin_unlock(&session->s_cap_lock); |
1296 | dispose_cap_releases(session->s_mdsc, &dispose); | |
2f2dc053 SW |
1297 | } |
1298 | ||
1299 | /* | |
1300 | * wake up any threads waiting on this session's caps. if the cap is | |
1301 | * old (didn't get renewed on the client reconnect), remove it now. | |
1302 | * | |
1303 | * caller must hold s_mutex. | |
1304 | */ | |
1305 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1306 | void *arg) | |
1307 | { | |
0dc2570f SW |
1308 | struct ceph_inode_info *ci = ceph_inode(inode); |
1309 | ||
0dc2570f | 1310 | if (arg) { |
be655596 | 1311 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1312 | ci->i_wanted_max_size = 0; |
1313 | ci->i_requested_max_size = 0; | |
be655596 | 1314 | spin_unlock(&ci->i_ceph_lock); |
0dc2570f | 1315 | } |
e5360309 | 1316 | wake_up_all(&ci->i_cap_wq); |
2f2dc053 SW |
1317 | return 0; |
1318 | } | |
1319 | ||
0dc2570f SW |
1320 | static void wake_up_session_caps(struct ceph_mds_session *session, |
1321 | int reconnect) | |
2f2dc053 SW |
1322 | { |
1323 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
0dc2570f SW |
1324 | iterate_session_caps(session, wake_up_session_cb, |
1325 | (void *)(unsigned long)reconnect); | |
2f2dc053 SW |
1326 | } |
1327 | ||
1328 | /* | |
1329 | * Send periodic message to MDS renewing all currently held caps. The | |
1330 | * ack will reset the expiration for all caps from this session. | |
1331 | * | |
1332 | * caller holds s_mutex | |
1333 | */ | |
1334 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1335 | struct ceph_mds_session *session) | |
1336 | { | |
1337 | struct ceph_msg *msg; | |
1338 | int state; | |
1339 | ||
1340 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1341 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1342 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1343 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1344 | |
1345 | /* do not try to renew caps until a recovering mds has reconnected | |
1346 | * with its clients. */ | |
1347 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1348 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1349 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1350 | session->s_mds, ceph_mds_state_name(state)); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1354 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1355 | ceph_mds_state_name(state)); | |
2f2dc053 SW |
1356 | msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1357 | ++session->s_renew_seq); | |
a79832f2 SW |
1358 | if (!msg) |
1359 | return -ENOMEM; | |
2f2dc053 SW |
1360 | ceph_con_send(&session->s_con, msg); |
1361 | return 0; | |
1362 | } | |
1363 | ||
186e4f7a YZ |
1364 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1365 | struct ceph_mds_session *session, u64 seq) | |
1366 | { | |
1367 | struct ceph_msg *msg; | |
1368 | ||
1369 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
a687ecaf | 1370 | session->s_mds, ceph_session_state_name(session->s_state), seq); |
186e4f7a YZ |
1371 | msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); |
1372 | if (!msg) | |
1373 | return -ENOMEM; | |
1374 | ceph_con_send(&session->s_con, msg); | |
1375 | return 0; | |
1376 | } | |
1377 | ||
1378 | ||
2f2dc053 SW |
1379 | /* |
1380 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1381 | * |
1382 | * Called under session->s_mutex | |
2f2dc053 SW |
1383 | */ |
1384 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1385 | struct ceph_mds_session *session, int is_renew) | |
1386 | { | |
1387 | int was_stale; | |
1388 | int wake = 0; | |
1389 | ||
1390 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1391 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1392 | |
1393 | session->s_cap_ttl = session->s_renew_requested + | |
1394 | mdsc->mdsmap->m_session_timeout*HZ; | |
1395 | ||
1396 | if (was_stale) { | |
1397 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1398 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1399 | wake = 1; | |
1400 | } else { | |
1401 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1402 | } | |
1403 | } | |
1404 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1405 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1406 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1407 | spin_unlock(&session->s_cap_lock); | |
1408 | ||
1409 | if (wake) | |
0dc2570f | 1410 | wake_up_session_caps(session, 0); |
2f2dc053 SW |
1411 | } |
1412 | ||
1413 | /* | |
1414 | * send a session close request | |
1415 | */ | |
1416 | static int request_close_session(struct ceph_mds_client *mdsc, | |
1417 | struct ceph_mds_session *session) | |
1418 | { | |
1419 | struct ceph_msg *msg; | |
2f2dc053 SW |
1420 | |
1421 | dout("request_close_session mds%d state %s seq %lld\n", | |
a687ecaf | 1422 | session->s_mds, ceph_session_state_name(session->s_state), |
2f2dc053 SW |
1423 | session->s_seq); |
1424 | msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq); | |
a79832f2 SW |
1425 | if (!msg) |
1426 | return -ENOMEM; | |
1427 | ceph_con_send(&session->s_con, msg); | |
fcff415c | 1428 | return 1; |
2f2dc053 SW |
1429 | } |
1430 | ||
1431 | /* | |
1432 | * Called with s_mutex held. | |
1433 | */ | |
1434 | static int __close_session(struct ceph_mds_client *mdsc, | |
1435 | struct ceph_mds_session *session) | |
1436 | { | |
1437 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1438 | return 0; | |
1439 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
1440 | return request_close_session(mdsc, session); | |
1441 | } | |
1442 | ||
040d7860 YZ |
1443 | static bool drop_negative_children(struct dentry *dentry) |
1444 | { | |
1445 | struct dentry *child; | |
1446 | bool all_negative = true; | |
1447 | ||
1448 | if (!d_is_dir(dentry)) | |
1449 | goto out; | |
1450 | ||
1451 | spin_lock(&dentry->d_lock); | |
1452 | list_for_each_entry(child, &dentry->d_subdirs, d_child) { | |
1453 | if (d_really_is_positive(child)) { | |
1454 | all_negative = false; | |
1455 | break; | |
1456 | } | |
1457 | } | |
1458 | spin_unlock(&dentry->d_lock); | |
1459 | ||
1460 | if (all_negative) | |
1461 | shrink_dcache_parent(dentry); | |
1462 | out: | |
1463 | return all_negative; | |
1464 | } | |
1465 | ||
2f2dc053 SW |
1466 | /* |
1467 | * Trim old(er) caps. | |
1468 | * | |
1469 | * Because we can't cache an inode without one or more caps, we do | |
1470 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1471 | * point the inode will hopefully get dropped to. | |
1472 | * | |
1473 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1474 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1475 | */ | |
1476 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1477 | { | |
1478 | struct ceph_mds_session *session = arg; | |
1479 | struct ceph_inode_info *ci = ceph_inode(inode); | |
979abfdd | 1480 | int used, wanted, oissued, mine; |
2f2dc053 SW |
1481 | |
1482 | if (session->s_trim_caps <= 0) | |
1483 | return -1; | |
1484 | ||
be655596 | 1485 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1486 | mine = cap->issued | cap->implemented; |
1487 | used = __ceph_caps_used(ci); | |
979abfdd | 1488 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1489 | oissued = __ceph_caps_issued_other(ci, cap); |
1490 | ||
979abfdd | 1491 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1492 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1493 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1494 | if (cap == ci->i_auth_cap) { | |
622f3e25 YZ |
1495 | if (ci->i_dirty_caps || ci->i_flushing_caps || |
1496 | !list_empty(&ci->i_cap_snaps)) | |
979abfdd YZ |
1497 | goto out; |
1498 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1499 | goto out; | |
89aa5930 YZ |
1500 | /* Note: it's possible that i_filelock_ref becomes non-zero |
1501 | * after dropping auth caps. It doesn't hurt because reply | |
1502 | * of lock mds request will re-add auth caps. */ | |
1503 | if (atomic_read(&ci->i_filelock_ref) > 0) | |
1504 | goto out; | |
979abfdd | 1505 | } |
5e804ac4 YZ |
1506 | /* The inode has cached pages, but it's no longer used. |
1507 | * we can safely drop it */ | |
1508 | if (wanted == 0 && used == CEPH_CAP_FILE_CACHE && | |
1509 | !(oissued & CEPH_CAP_FILE_CACHE)) { | |
1510 | used = 0; | |
1511 | oissued = 0; | |
1512 | } | |
979abfdd | 1513 | if ((used | wanted) & ~oissued & mine) |
2f2dc053 SW |
1514 | goto out; /* we need these caps */ |
1515 | ||
2f2dc053 SW |
1516 | if (oissued) { |
1517 | /* we aren't the only cap.. just remove us */ | |
a096b09a | 1518 | __ceph_remove_cap(cap, true); |
040d7860 | 1519 | session->s_trim_caps--; |
2f2dc053 | 1520 | } else { |
040d7860 | 1521 | struct dentry *dentry; |
5e804ac4 | 1522 | /* try dropping referring dentries */ |
be655596 | 1523 | spin_unlock(&ci->i_ceph_lock); |
040d7860 YZ |
1524 | dentry = d_find_any_alias(inode); |
1525 | if (dentry && drop_negative_children(dentry)) { | |
1526 | int count; | |
1527 | dput(dentry); | |
1528 | d_prune_aliases(inode); | |
1529 | count = atomic_read(&inode->i_count); | |
1530 | if (count == 1) | |
1531 | session->s_trim_caps--; | |
1532 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", | |
1533 | inode, cap, count); | |
1534 | } else { | |
1535 | dput(dentry); | |
1536 | } | |
2f2dc053 SW |
1537 | return 0; |
1538 | } | |
1539 | ||
1540 | out: | |
be655596 | 1541 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
1542 | return 0; |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * Trim session cap count down to some max number. | |
1547 | */ | |
1548 | static int trim_caps(struct ceph_mds_client *mdsc, | |
1549 | struct ceph_mds_session *session, | |
1550 | int max_caps) | |
1551 | { | |
1552 | int trim_caps = session->s_nr_caps - max_caps; | |
1553 | ||
1554 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
1555 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
1556 | if (trim_caps > 0) { | |
1557 | session->s_trim_caps = trim_caps; | |
1558 | iterate_session_caps(session, trim_caps_cb, session); | |
1559 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", | |
1560 | session->s_mds, session->s_nr_caps, max_caps, | |
1561 | trim_caps - session->s_trim_caps); | |
5dacf091 | 1562 | session->s_trim_caps = 0; |
2f2dc053 | 1563 | } |
a56371d9 | 1564 | |
a56371d9 | 1565 | ceph_send_cap_releases(mdsc, session); |
2f2dc053 SW |
1566 | return 0; |
1567 | } | |
1568 | ||
8310b089 YZ |
1569 | static int check_caps_flush(struct ceph_mds_client *mdsc, |
1570 | u64 want_flush_tid) | |
1571 | { | |
8310b089 YZ |
1572 | int ret = 1; |
1573 | ||
1574 | spin_lock(&mdsc->cap_dirty_lock); | |
e4500b5e YZ |
1575 | if (!list_empty(&mdsc->cap_flush_list)) { |
1576 | struct ceph_cap_flush *cf = | |
1577 | list_first_entry(&mdsc->cap_flush_list, | |
1578 | struct ceph_cap_flush, g_list); | |
1579 | if (cf->tid <= want_flush_tid) { | |
1580 | dout("check_caps_flush still flushing tid " | |
1581 | "%llu <= %llu\n", cf->tid, want_flush_tid); | |
1582 | ret = 0; | |
1583 | } | |
8310b089 YZ |
1584 | } |
1585 | spin_unlock(&mdsc->cap_dirty_lock); | |
1586 | return ret; | |
d3383a8e YZ |
1587 | } |
1588 | ||
2f2dc053 SW |
1589 | /* |
1590 | * flush all dirty inode data to disk. | |
1591 | * | |
8310b089 | 1592 | * returns true if we've flushed through want_flush_tid |
2f2dc053 | 1593 | */ |
affbc19a | 1594 | static void wait_caps_flush(struct ceph_mds_client *mdsc, |
0e294387 | 1595 | u64 want_flush_tid) |
2f2dc053 | 1596 | { |
0e294387 | 1597 | dout("check_caps_flush want %llu\n", want_flush_tid); |
8310b089 YZ |
1598 | |
1599 | wait_event(mdsc->cap_flushing_wq, | |
1600 | check_caps_flush(mdsc, want_flush_tid)); | |
1601 | ||
1602 | dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid); | |
2f2dc053 SW |
1603 | } |
1604 | ||
1605 | /* | |
1606 | * called under s_mutex | |
1607 | */ | |
3d7ded4d SW |
1608 | void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
1609 | struct ceph_mds_session *session) | |
2f2dc053 | 1610 | { |
745a8e3b YZ |
1611 | struct ceph_msg *msg = NULL; |
1612 | struct ceph_mds_cap_release *head; | |
1613 | struct ceph_mds_cap_item *item; | |
92475f05 | 1614 | struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; |
745a8e3b YZ |
1615 | struct ceph_cap *cap; |
1616 | LIST_HEAD(tmp_list); | |
1617 | int num_cap_releases; | |
92475f05 JL |
1618 | __le32 barrier, *cap_barrier; |
1619 | ||
1620 | down_read(&osdc->lock); | |
1621 | barrier = cpu_to_le32(osdc->epoch_barrier); | |
1622 | up_read(&osdc->lock); | |
2f2dc053 | 1623 | |
0f8605f2 | 1624 | spin_lock(&session->s_cap_lock); |
745a8e3b YZ |
1625 | again: |
1626 | list_splice_init(&session->s_cap_releases, &tmp_list); | |
1627 | num_cap_releases = session->s_num_cap_releases; | |
1628 | session->s_num_cap_releases = 0; | |
2f2dc053 | 1629 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 1630 | |
745a8e3b YZ |
1631 | while (!list_empty(&tmp_list)) { |
1632 | if (!msg) { | |
1633 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, | |
09cbfeaf | 1634 | PAGE_SIZE, GFP_NOFS, false); |
745a8e3b YZ |
1635 | if (!msg) |
1636 | goto out_err; | |
1637 | head = msg->front.iov_base; | |
1638 | head->num = cpu_to_le32(0); | |
1639 | msg->front.iov_len = sizeof(*head); | |
92475f05 JL |
1640 | |
1641 | msg->hdr.version = cpu_to_le16(2); | |
1642 | msg->hdr.compat_version = cpu_to_le16(1); | |
745a8e3b | 1643 | } |
92475f05 | 1644 | |
745a8e3b YZ |
1645 | cap = list_first_entry(&tmp_list, struct ceph_cap, |
1646 | session_caps); | |
1647 | list_del(&cap->session_caps); | |
1648 | num_cap_releases--; | |
e01a5946 | 1649 | |
00bd8edb | 1650 | head = msg->front.iov_base; |
745a8e3b YZ |
1651 | le32_add_cpu(&head->num, 1); |
1652 | item = msg->front.iov_base + msg->front.iov_len; | |
1653 | item->ino = cpu_to_le64(cap->cap_ino); | |
1654 | item->cap_id = cpu_to_le64(cap->cap_id); | |
1655 | item->migrate_seq = cpu_to_le32(cap->mseq); | |
1656 | item->seq = cpu_to_le32(cap->issue_seq); | |
1657 | msg->front.iov_len += sizeof(*item); | |
1658 | ||
1659 | ceph_put_cap(mdsc, cap); | |
1660 | ||
1661 | if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { | |
92475f05 JL |
1662 | // Append cap_barrier field |
1663 | cap_barrier = msg->front.iov_base + msg->front.iov_len; | |
1664 | *cap_barrier = barrier; | |
1665 | msg->front.iov_len += sizeof(*cap_barrier); | |
1666 | ||
745a8e3b YZ |
1667 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
1668 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1669 | ceph_con_send(&session->s_con, msg); | |
1670 | msg = NULL; | |
1671 | } | |
00bd8edb | 1672 | } |
e01a5946 | 1673 | |
745a8e3b | 1674 | BUG_ON(num_cap_releases != 0); |
e01a5946 | 1675 | |
745a8e3b YZ |
1676 | spin_lock(&session->s_cap_lock); |
1677 | if (!list_empty(&session->s_cap_releases)) | |
1678 | goto again; | |
1679 | spin_unlock(&session->s_cap_lock); | |
1680 | ||
1681 | if (msg) { | |
92475f05 JL |
1682 | // Append cap_barrier field |
1683 | cap_barrier = msg->front.iov_base + msg->front.iov_len; | |
1684 | *cap_barrier = barrier; | |
1685 | msg->front.iov_len += sizeof(*cap_barrier); | |
1686 | ||
745a8e3b YZ |
1687 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
1688 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
1689 | ceph_con_send(&session->s_con, msg); | |
e01a5946 | 1690 | } |
745a8e3b YZ |
1691 | return; |
1692 | out_err: | |
1693 | pr_err("send_cap_releases mds%d, failed to allocate message\n", | |
1694 | session->s_mds); | |
1695 | spin_lock(&session->s_cap_lock); | |
1696 | list_splice(&tmp_list, &session->s_cap_releases); | |
1697 | session->s_num_cap_releases += num_cap_releases; | |
1698 | spin_unlock(&session->s_cap_lock); | |
e01a5946 SW |
1699 | } |
1700 | ||
2f2dc053 SW |
1701 | /* |
1702 | * requests | |
1703 | */ | |
1704 | ||
54008399 YZ |
1705 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
1706 | struct inode *dir) | |
1707 | { | |
1708 | struct ceph_inode_info *ci = ceph_inode(dir); | |
1709 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
1710 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
2a5beea3 | 1711 | size_t size = sizeof(struct ceph_mds_reply_dir_entry); |
54008399 YZ |
1712 | int order, num_entries; |
1713 | ||
1714 | spin_lock(&ci->i_ceph_lock); | |
1715 | num_entries = ci->i_files + ci->i_subdirs; | |
1716 | spin_unlock(&ci->i_ceph_lock); | |
1717 | num_entries = max(num_entries, 1); | |
1718 | num_entries = min(num_entries, opt->max_readdir); | |
1719 | ||
1720 | order = get_order(size * num_entries); | |
1721 | while (order >= 0) { | |
2a5beea3 YZ |
1722 | rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL | |
1723 | __GFP_NOWARN, | |
1724 | order); | |
1725 | if (rinfo->dir_entries) | |
54008399 YZ |
1726 | break; |
1727 | order--; | |
1728 | } | |
2a5beea3 | 1729 | if (!rinfo->dir_entries) |
54008399 YZ |
1730 | return -ENOMEM; |
1731 | ||
1732 | num_entries = (PAGE_SIZE << order) / size; | |
1733 | num_entries = min(num_entries, opt->max_readdir); | |
1734 | ||
1735 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
1736 | req->r_num_caps = num_entries + 1; | |
1737 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
1738 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
1739 | return 0; | |
1740 | } | |
1741 | ||
2f2dc053 SW |
1742 | /* |
1743 | * Create an mds request. | |
1744 | */ | |
1745 | struct ceph_mds_request * | |
1746 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
1747 | { | |
1748 | struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS); | |
1749 | ||
1750 | if (!req) | |
1751 | return ERR_PTR(-ENOMEM); | |
1752 | ||
b4556396 | 1753 | mutex_init(&req->r_fill_mutex); |
37151668 | 1754 | req->r_mdsc = mdsc; |
2f2dc053 SW |
1755 | req->r_started = jiffies; |
1756 | req->r_resend_mds = -1; | |
1757 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
68cd5b4b | 1758 | INIT_LIST_HEAD(&req->r_unsafe_target_item); |
2f2dc053 | 1759 | req->r_fmode = -1; |
153c8e6b | 1760 | kref_init(&req->r_kref); |
fcd00b68 | 1761 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
1762 | INIT_LIST_HEAD(&req->r_wait); |
1763 | init_completion(&req->r_completion); | |
1764 | init_completion(&req->r_safe_completion); | |
1765 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
1766 | ||
56199016 | 1767 | req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran); |
b8e69066 | 1768 | |
2f2dc053 SW |
1769 | req->r_op = op; |
1770 | req->r_direct_mode = mode; | |
1771 | return req; | |
1772 | } | |
1773 | ||
1774 | /* | |
44ca18f2 | 1775 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
1776 | * |
1777 | * called under mdsc->mutex. | |
1778 | */ | |
44ca18f2 SW |
1779 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
1780 | { | |
1781 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
1782 | return NULL; | |
1783 | return rb_entry(rb_first(&mdsc->request_tree), | |
1784 | struct ceph_mds_request, r_node); | |
1785 | } | |
1786 | ||
e8a7b8b1 | 1787 | static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
2f2dc053 | 1788 | { |
e8a7b8b1 | 1789 | return mdsc->oldest_tid; |
2f2dc053 SW |
1790 | } |
1791 | ||
1792 | /* | |
1793 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
1794 | * on build_path_from_dentry in fs/cifs/dir.c. | |
1795 | * | |
1796 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
1797 | * inode. | |
1798 | * | |
1799 | * Encode hidden .snap dirs as a double /, i.e. | |
1800 | * foo/.snap/bar -> foo//bar | |
1801 | */ | |
1802 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, | |
1803 | int stop_on_nosnap) | |
1804 | { | |
1805 | struct dentry *temp; | |
1806 | char *path; | |
1807 | int len, pos; | |
1b71fe2e | 1808 | unsigned seq; |
2f2dc053 | 1809 | |
d37b1d99 | 1810 | if (!dentry) |
2f2dc053 SW |
1811 | return ERR_PTR(-EINVAL); |
1812 | ||
1813 | retry: | |
1814 | len = 0; | |
1b71fe2e AV |
1815 | seq = read_seqbegin(&rename_lock); |
1816 | rcu_read_lock(); | |
2f2dc053 | 1817 | for (temp = dentry; !IS_ROOT(temp);) { |
2b0143b5 | 1818 | struct inode *inode = d_inode(temp); |
2f2dc053 SW |
1819 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) |
1820 | len++; /* slash only */ | |
1821 | else if (stop_on_nosnap && inode && | |
1822 | ceph_snap(inode) == CEPH_NOSNAP) | |
1823 | break; | |
1824 | else | |
1825 | len += 1 + temp->d_name.len; | |
1826 | temp = temp->d_parent; | |
2f2dc053 | 1827 | } |
1b71fe2e | 1828 | rcu_read_unlock(); |
2f2dc053 SW |
1829 | if (len) |
1830 | len--; /* no leading '/' */ | |
1831 | ||
1832 | path = kmalloc(len+1, GFP_NOFS); | |
d37b1d99 | 1833 | if (!path) |
2f2dc053 SW |
1834 | return ERR_PTR(-ENOMEM); |
1835 | pos = len; | |
1836 | path[pos] = 0; /* trailing null */ | |
1b71fe2e | 1837 | rcu_read_lock(); |
2f2dc053 | 1838 | for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) { |
1b71fe2e | 1839 | struct inode *inode; |
2f2dc053 | 1840 | |
1b71fe2e | 1841 | spin_lock(&temp->d_lock); |
2b0143b5 | 1842 | inode = d_inode(temp); |
2f2dc053 | 1843 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 1844 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 SW |
1845 | pos, temp); |
1846 | } else if (stop_on_nosnap && inode && | |
1847 | ceph_snap(inode) == CEPH_NOSNAP) { | |
9d5a09e6 | 1848 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1849 | break; |
1850 | } else { | |
1851 | pos -= temp->d_name.len; | |
1b71fe2e AV |
1852 | if (pos < 0) { |
1853 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 1854 | break; |
1b71fe2e | 1855 | } |
2f2dc053 SW |
1856 | strncpy(path + pos, temp->d_name.name, |
1857 | temp->d_name.len); | |
2f2dc053 | 1858 | } |
1b71fe2e | 1859 | spin_unlock(&temp->d_lock); |
2f2dc053 SW |
1860 | if (pos) |
1861 | path[--pos] = '/'; | |
1862 | temp = temp->d_parent; | |
2f2dc053 | 1863 | } |
1b71fe2e AV |
1864 | rcu_read_unlock(); |
1865 | if (pos != 0 || read_seqretry(&rename_lock, seq)) { | |
104648ad | 1866 | pr_err("build_path did not end path lookup where " |
2f2dc053 SW |
1867 | "expected, namelen is %d, pos is %d\n", len, pos); |
1868 | /* presumably this is only possible if racing with a | |
1869 | rename of one of the parent directories (we can not | |
1870 | lock the dentries above us to prevent this, but | |
1871 | retrying should be harmless) */ | |
1872 | kfree(path); | |
1873 | goto retry; | |
1874 | } | |
1875 | ||
2b0143b5 | 1876 | *base = ceph_ino(d_inode(temp)); |
2f2dc053 | 1877 | *plen = len; |
104648ad | 1878 | dout("build_path on %p %d built %llx '%.*s'\n", |
84d08fa8 | 1879 | dentry, d_count(dentry), *base, len, path); |
2f2dc053 SW |
1880 | return path; |
1881 | } | |
1882 | ||
fd36a717 | 1883 | static int build_dentry_path(struct dentry *dentry, struct inode *dir, |
2f2dc053 SW |
1884 | const char **ppath, int *ppathlen, u64 *pino, |
1885 | int *pfreepath) | |
1886 | { | |
1887 | char *path; | |
1888 | ||
c6b0b656 | 1889 | rcu_read_lock(); |
fd36a717 JL |
1890 | if (!dir) |
1891 | dir = d_inode_rcu(dentry->d_parent); | |
c6b0b656 JL |
1892 | if (dir && ceph_snap(dir) == CEPH_NOSNAP) { |
1893 | *pino = ceph_ino(dir); | |
1894 | rcu_read_unlock(); | |
2f2dc053 SW |
1895 | *ppath = dentry->d_name.name; |
1896 | *ppathlen = dentry->d_name.len; | |
1897 | return 0; | |
1898 | } | |
c6b0b656 | 1899 | rcu_read_unlock(); |
2f2dc053 SW |
1900 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); |
1901 | if (IS_ERR(path)) | |
1902 | return PTR_ERR(path); | |
1903 | *ppath = path; | |
1904 | *pfreepath = 1; | |
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | static int build_inode_path(struct inode *inode, | |
1909 | const char **ppath, int *ppathlen, u64 *pino, | |
1910 | int *pfreepath) | |
1911 | { | |
1912 | struct dentry *dentry; | |
1913 | char *path; | |
1914 | ||
1915 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
1916 | *pino = ceph_ino(inode); | |
1917 | *ppathlen = 0; | |
1918 | return 0; | |
1919 | } | |
1920 | dentry = d_find_alias(inode); | |
1921 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
1922 | dput(dentry); | |
1923 | if (IS_ERR(path)) | |
1924 | return PTR_ERR(path); | |
1925 | *ppath = path; | |
1926 | *pfreepath = 1; | |
1927 | return 0; | |
1928 | } | |
1929 | ||
1930 | /* | |
1931 | * request arguments may be specified via an inode *, a dentry *, or | |
1932 | * an explicit ino+path. | |
1933 | */ | |
1934 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
fd36a717 JL |
1935 | struct inode *rdiri, const char *rpath, |
1936 | u64 rino, const char **ppath, int *pathlen, | |
2f2dc053 SW |
1937 | u64 *ino, int *freepath) |
1938 | { | |
1939 | int r = 0; | |
1940 | ||
1941 | if (rinode) { | |
1942 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
1943 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
1944 | ceph_snap(rinode)); | |
1945 | } else if (rdentry) { | |
fd36a717 JL |
1946 | r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino, |
1947 | freepath); | |
2f2dc053 SW |
1948 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, |
1949 | *ppath); | |
795858db | 1950 | } else if (rpath || rino) { |
2f2dc053 SW |
1951 | *ino = rino; |
1952 | *ppath = rpath; | |
b000056a | 1953 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
1954 | dout(" path %.*s\n", *pathlen, rpath); |
1955 | } | |
1956 | ||
1957 | return r; | |
1958 | } | |
1959 | ||
1960 | /* | |
1961 | * called under mdsc->mutex | |
1962 | */ | |
1963 | static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc, | |
1964 | struct ceph_mds_request *req, | |
6e6f0923 | 1965 | int mds, bool drop_cap_releases) |
2f2dc053 SW |
1966 | { |
1967 | struct ceph_msg *msg; | |
1968 | struct ceph_mds_request_head *head; | |
1969 | const char *path1 = NULL; | |
1970 | const char *path2 = NULL; | |
1971 | u64 ino1 = 0, ino2 = 0; | |
1972 | int pathlen1 = 0, pathlen2 = 0; | |
1973 | int freepath1 = 0, freepath2 = 0; | |
1974 | int len; | |
1975 | u16 releases; | |
1976 | void *p, *end; | |
1977 | int ret; | |
1978 | ||
1979 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
3dd69aab | 1980 | req->r_parent, req->r_path1, req->r_ino1.ino, |
2f2dc053 SW |
1981 | &path1, &pathlen1, &ino1, &freepath1); |
1982 | if (ret < 0) { | |
1983 | msg = ERR_PTR(ret); | |
1984 | goto out; | |
1985 | } | |
1986 | ||
1987 | ret = set_request_path_attr(NULL, req->r_old_dentry, | |
fd36a717 | 1988 | req->r_old_dentry_dir, |
2f2dc053 SW |
1989 | req->r_path2, req->r_ino2.ino, |
1990 | &path2, &pathlen2, &ino2, &freepath2); | |
1991 | if (ret < 0) { | |
1992 | msg = ERR_PTR(ret); | |
1993 | goto out_free1; | |
1994 | } | |
1995 | ||
1996 | len = sizeof(*head) + | |
b8e69066 | 1997 | pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
777d738a | 1998 | sizeof(struct ceph_timespec); |
2f2dc053 SW |
1999 | |
2000 | /* calculate (max) length for cap releases */ | |
2001 | len += sizeof(struct ceph_mds_request_release) * | |
2002 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
2003 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
2004 | if (req->r_dentry_drop) | |
2005 | len += req->r_dentry->d_name.len; | |
2006 | if (req->r_old_dentry_drop) | |
2007 | len += req->r_old_dentry->d_name.len; | |
2008 | ||
b61c2763 | 2009 | msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false); |
a79832f2 SW |
2010 | if (!msg) { |
2011 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 2012 | goto out_free2; |
a79832f2 | 2013 | } |
2f2dc053 | 2014 | |
7cfa0313 | 2015 | msg->hdr.version = cpu_to_le16(2); |
6df058c0 SW |
2016 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
2017 | ||
2f2dc053 SW |
2018 | head = msg->front.iov_base; |
2019 | p = msg->front.iov_base + sizeof(*head); | |
2020 | end = msg->front.iov_base + msg->front.iov_len; | |
2021 | ||
2022 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
2023 | head->op = cpu_to_le32(req->r_op); | |
ff3d0046 EB |
2024 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid)); |
2025 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid)); | |
2f2dc053 SW |
2026 | head->args = req->r_args; |
2027 | ||
2028 | ceph_encode_filepath(&p, end, ino1, path1); | |
2029 | ceph_encode_filepath(&p, end, ino2, path2); | |
2030 | ||
e979cf50 SW |
2031 | /* make note of release offset, in case we need to replay */ |
2032 | req->r_request_release_offset = p - msg->front.iov_base; | |
2033 | ||
2f2dc053 SW |
2034 | /* cap releases */ |
2035 | releases = 0; | |
2036 | if (req->r_inode_drop) | |
2037 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 2038 | req->r_inode ? req->r_inode : d_inode(req->r_dentry), |
2f2dc053 SW |
2039 | mds, req->r_inode_drop, req->r_inode_unless, 0); |
2040 | if (req->r_dentry_drop) | |
2041 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
3dd69aab | 2042 | req->r_parent, mds, req->r_dentry_drop, |
ca6c8ae0 | 2043 | req->r_dentry_unless); |
2f2dc053 SW |
2044 | if (req->r_old_dentry_drop) |
2045 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
ca6c8ae0 JL |
2046 | req->r_old_dentry_dir, mds, |
2047 | req->r_old_dentry_drop, | |
2048 | req->r_old_dentry_unless); | |
2f2dc053 SW |
2049 | if (req->r_old_inode_drop) |
2050 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 2051 | d_inode(req->r_old_dentry), |
2f2dc053 | 2052 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); |
6e6f0923 YZ |
2053 | |
2054 | if (drop_cap_releases) { | |
2055 | releases = 0; | |
2056 | p = msg->front.iov_base + req->r_request_release_offset; | |
2057 | } | |
2058 | ||
2f2dc053 SW |
2059 | head->num_releases = cpu_to_le16(releases); |
2060 | ||
b8e69066 | 2061 | /* time stamp */ |
1f041a89 YZ |
2062 | { |
2063 | struct ceph_timespec ts; | |
2064 | ceph_encode_timespec(&ts, &req->r_stamp); | |
2065 | ceph_encode_copy(&p, &ts, sizeof(ts)); | |
2066 | } | |
b8e69066 | 2067 | |
2f2dc053 SW |
2068 | BUG_ON(p > end); |
2069 | msg->front.iov_len = p - msg->front.iov_base; | |
2070 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
2071 | ||
25e6bae3 YZ |
2072 | if (req->r_pagelist) { |
2073 | struct ceph_pagelist *pagelist = req->r_pagelist; | |
0e1a5ee6 | 2074 | refcount_inc(&pagelist->refcnt); |
25e6bae3 YZ |
2075 | ceph_msg_data_add_pagelist(msg, pagelist); |
2076 | msg->hdr.data_len = cpu_to_le32(pagelist->length); | |
2077 | } else { | |
2078 | msg->hdr.data_len = 0; | |
ebf18f47 | 2079 | } |
02afca6c | 2080 | |
2f2dc053 SW |
2081 | msg->hdr.data_off = cpu_to_le16(0); |
2082 | ||
2083 | out_free2: | |
2084 | if (freepath2) | |
2085 | kfree((char *)path2); | |
2086 | out_free1: | |
2087 | if (freepath1) | |
2088 | kfree((char *)path1); | |
2089 | out: | |
2090 | return msg; | |
2091 | } | |
2092 | ||
2093 | /* | |
2094 | * called under mdsc->mutex if error, under no mutex if | |
2095 | * success. | |
2096 | */ | |
2097 | static void complete_request(struct ceph_mds_client *mdsc, | |
2098 | struct ceph_mds_request *req) | |
2099 | { | |
2100 | if (req->r_callback) | |
2101 | req->r_callback(mdsc, req); | |
2102 | else | |
03066f23 | 2103 | complete_all(&req->r_completion); |
2f2dc053 SW |
2104 | } |
2105 | ||
2106 | /* | |
2107 | * called under mdsc->mutex | |
2108 | */ | |
2109 | static int __prepare_send_request(struct ceph_mds_client *mdsc, | |
2110 | struct ceph_mds_request *req, | |
6e6f0923 | 2111 | int mds, bool drop_cap_releases) |
2f2dc053 SW |
2112 | { |
2113 | struct ceph_mds_request_head *rhead; | |
2114 | struct ceph_msg *msg; | |
2115 | int flags = 0; | |
2116 | ||
2f2dc053 | 2117 | req->r_attempts++; |
e55b71f8 GF |
2118 | if (req->r_inode) { |
2119 | struct ceph_cap *cap = | |
2120 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
2121 | ||
2122 | if (cap) | |
2123 | req->r_sent_on_mseq = cap->mseq; | |
2124 | else | |
2125 | req->r_sent_on_mseq = -1; | |
2126 | } | |
2f2dc053 SW |
2127 | dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req, |
2128 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); | |
2129 | ||
bc2de10d | 2130 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { |
c5c9a0bf | 2131 | void *p; |
01a92f17 SW |
2132 | /* |
2133 | * Replay. Do not regenerate message (and rebuild | |
2134 | * paths, etc.); just use the original message. | |
2135 | * Rebuilding paths will break for renames because | |
2136 | * d_move mangles the src name. | |
2137 | */ | |
2138 | msg = req->r_request; | |
2139 | rhead = msg->front.iov_base; | |
2140 | ||
2141 | flags = le32_to_cpu(rhead->flags); | |
2142 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2143 | rhead->flags = cpu_to_le32(flags); | |
2144 | ||
2145 | if (req->r_target_inode) | |
2146 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
2147 | ||
2148 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
2149 | |
2150 | /* remove cap/dentry releases from message */ | |
2151 | rhead->num_releases = 0; | |
c5c9a0bf YZ |
2152 | |
2153 | /* time stamp */ | |
2154 | p = msg->front.iov_base + req->r_request_release_offset; | |
1f041a89 YZ |
2155 | { |
2156 | struct ceph_timespec ts; | |
2157 | ceph_encode_timespec(&ts, &req->r_stamp); | |
2158 | ceph_encode_copy(&p, &ts, sizeof(ts)); | |
2159 | } | |
c5c9a0bf YZ |
2160 | |
2161 | msg->front.iov_len = p - msg->front.iov_base; | |
2162 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
01a92f17 SW |
2163 | return 0; |
2164 | } | |
2165 | ||
2f2dc053 SW |
2166 | if (req->r_request) { |
2167 | ceph_msg_put(req->r_request); | |
2168 | req->r_request = NULL; | |
2169 | } | |
6e6f0923 | 2170 | msg = create_request_message(mdsc, req, mds, drop_cap_releases); |
2f2dc053 | 2171 | if (IS_ERR(msg)) { |
e1518c7c | 2172 | req->r_err = PTR_ERR(msg); |
a79832f2 | 2173 | return PTR_ERR(msg); |
2f2dc053 SW |
2174 | } |
2175 | req->r_request = msg; | |
2176 | ||
2177 | rhead = msg->front.iov_base; | |
2f2dc053 | 2178 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
bc2de10d | 2179 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
2f2dc053 | 2180 | flags |= CEPH_MDS_FLAG_REPLAY; |
3dd69aab | 2181 | if (req->r_parent) |
2f2dc053 SW |
2182 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; |
2183 | rhead->flags = cpu_to_le32(flags); | |
2184 | rhead->num_fwd = req->r_num_fwd; | |
2185 | rhead->num_retry = req->r_attempts - 1; | |
01a92f17 | 2186 | rhead->ino = 0; |
2f2dc053 | 2187 | |
3dd69aab | 2188 | dout(" r_parent = %p\n", req->r_parent); |
2f2dc053 SW |
2189 | return 0; |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * send request, or put it on the appropriate wait list. | |
2194 | */ | |
2195 | static int __do_request(struct ceph_mds_client *mdsc, | |
2196 | struct ceph_mds_request *req) | |
2197 | { | |
2198 | struct ceph_mds_session *session = NULL; | |
2199 | int mds = -1; | |
48fec5d0 | 2200 | int err = 0; |
2f2dc053 | 2201 | |
bc2de10d JL |
2202 | if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { |
2203 | if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) | |
eb1b8af3 | 2204 | __unregister_request(mdsc, req); |
2f2dc053 | 2205 | goto out; |
eb1b8af3 | 2206 | } |
2f2dc053 SW |
2207 | |
2208 | if (req->r_timeout && | |
2209 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
2210 | dout("do_request timed out\n"); | |
2211 | err = -EIO; | |
2212 | goto finish; | |
2213 | } | |
52953d55 | 2214 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
48fec5d0 YZ |
2215 | dout("do_request forced umount\n"); |
2216 | err = -EIO; | |
2217 | goto finish; | |
2218 | } | |
52953d55 | 2219 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) { |
e9e427f0 YZ |
2220 | if (mdsc->mdsmap_err) { |
2221 | err = mdsc->mdsmap_err; | |
2222 | dout("do_request mdsmap err %d\n", err); | |
2223 | goto finish; | |
2224 | } | |
cc8e8342 YZ |
2225 | if (mdsc->mdsmap->m_epoch == 0) { |
2226 | dout("do_request no mdsmap, waiting for map\n"); | |
2227 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2228 | goto finish; | |
2229 | } | |
e9e427f0 YZ |
2230 | if (!(mdsc->fsc->mount_options->flags & |
2231 | CEPH_MOUNT_OPT_MOUNTWAIT) && | |
2232 | !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) { | |
2233 | err = -ENOENT; | |
2234 | pr_info("probably no mds server is up\n"); | |
2235 | goto finish; | |
2236 | } | |
2237 | } | |
2f2dc053 | 2238 | |
dc69e2e9 SW |
2239 | put_request_session(req); |
2240 | ||
2f2dc053 SW |
2241 | mds = __choose_mds(mdsc, req); |
2242 | if (mds < 0 || | |
2243 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
2244 | dout("do_request no mds or not active, waiting for map\n"); | |
2245 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2246 | goto out; | |
2247 | } | |
2248 | ||
2249 | /* get, open session */ | |
2250 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 2251 | if (!session) { |
2f2dc053 | 2252 | session = register_session(mdsc, mds); |
9c423956 SW |
2253 | if (IS_ERR(session)) { |
2254 | err = PTR_ERR(session); | |
2255 | goto finish; | |
2256 | } | |
2257 | } | |
dc69e2e9 SW |
2258 | req->r_session = get_session(session); |
2259 | ||
2f2dc053 | 2260 | dout("do_request mds%d session %p state %s\n", mds, session, |
a687ecaf | 2261 | ceph_session_state_name(session->s_state)); |
2f2dc053 SW |
2262 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
2263 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
fcff415c YZ |
2264 | if (session->s_state == CEPH_MDS_SESSION_REJECTED) { |
2265 | err = -EACCES; | |
2266 | goto out_session; | |
2267 | } | |
2f2dc053 SW |
2268 | if (session->s_state == CEPH_MDS_SESSION_NEW || |
2269 | session->s_state == CEPH_MDS_SESSION_CLOSING) | |
2270 | __open_session(mdsc, session); | |
2271 | list_add(&req->r_wait, &session->s_waiting); | |
2272 | goto out_session; | |
2273 | } | |
2274 | ||
2275 | /* send request */ | |
2f2dc053 SW |
2276 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2277 | ||
2278 | if (req->r_request_started == 0) /* note request start time */ | |
2279 | req->r_request_started = jiffies; | |
2280 | ||
6e6f0923 | 2281 | err = __prepare_send_request(mdsc, req, mds, false); |
2f2dc053 SW |
2282 | if (!err) { |
2283 | ceph_msg_get(req->r_request); | |
2284 | ceph_con_send(&session->s_con, req->r_request); | |
2285 | } | |
2286 | ||
2287 | out_session: | |
2288 | ceph_put_mds_session(session); | |
48fec5d0 YZ |
2289 | finish: |
2290 | if (err) { | |
2291 | dout("__do_request early error %d\n", err); | |
2292 | req->r_err = err; | |
2293 | complete_request(mdsc, req); | |
2294 | __unregister_request(mdsc, req); | |
2295 | } | |
2f2dc053 SW |
2296 | out: |
2297 | return err; | |
2f2dc053 SW |
2298 | } |
2299 | ||
2300 | /* | |
2301 | * called under mdsc->mutex | |
2302 | */ | |
2303 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
2304 | struct list_head *head) | |
2305 | { | |
ed75ec2c YZ |
2306 | struct ceph_mds_request *req; |
2307 | LIST_HEAD(tmp_list); | |
2308 | ||
2309 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 2310 | |
ed75ec2c YZ |
2311 | while (!list_empty(&tmp_list)) { |
2312 | req = list_entry(tmp_list.next, | |
2313 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 2314 | list_del_init(&req->r_wait); |
7971bd92 | 2315 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
2316 | __do_request(mdsc, req); |
2317 | } | |
2318 | } | |
2319 | ||
2320 | /* | |
2321 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 2322 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 2323 | */ |
29790f26 | 2324 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 2325 | { |
44ca18f2 | 2326 | struct ceph_mds_request *req; |
282c1052 | 2327 | struct rb_node *p = rb_first(&mdsc->request_tree); |
2f2dc053 SW |
2328 | |
2329 | dout("kick_requests mds%d\n", mds); | |
282c1052 | 2330 | while (p) { |
44ca18f2 | 2331 | req = rb_entry(p, struct ceph_mds_request, r_node); |
282c1052 | 2332 | p = rb_next(p); |
bc2de10d | 2333 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
44ca18f2 | 2334 | continue; |
3de22be6 YZ |
2335 | if (req->r_attempts > 0) |
2336 | continue; /* only new requests */ | |
44ca18f2 SW |
2337 | if (req->r_session && |
2338 | req->r_session->s_mds == mds) { | |
2339 | dout(" kicking tid %llu\n", req->r_tid); | |
03974e81 | 2340 | list_del_init(&req->r_wait); |
44ca18f2 | 2341 | __do_request(mdsc, req); |
2f2dc053 SW |
2342 | } |
2343 | } | |
2344 | } | |
2345 | ||
2346 | void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, | |
2347 | struct ceph_mds_request *req) | |
2348 | { | |
2349 | dout("submit_request on %p\n", req); | |
2350 | mutex_lock(&mdsc->mutex); | |
2351 | __register_request(mdsc, req, NULL); | |
2352 | __do_request(mdsc, req); | |
2353 | mutex_unlock(&mdsc->mutex); | |
2354 | } | |
2355 | ||
2356 | /* | |
2357 | * Synchrously perform an mds request. Take care of all of the | |
2358 | * session setup, forwarding, retry details. | |
2359 | */ | |
2360 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
2361 | struct inode *dir, | |
2362 | struct ceph_mds_request *req) | |
2363 | { | |
2364 | int err; | |
2365 | ||
2366 | dout("do_request on %p\n", req); | |
2367 | ||
3dd69aab | 2368 | /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */ |
2f2dc053 SW |
2369 | if (req->r_inode) |
2370 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
3dd69aab JL |
2371 | if (req->r_parent) |
2372 | ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN); | |
844d87c3 | 2373 | if (req->r_old_dentry_dir) |
41b02e1f SW |
2374 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), |
2375 | CEPH_CAP_PIN); | |
2f2dc053 SW |
2376 | |
2377 | /* issue */ | |
2378 | mutex_lock(&mdsc->mutex); | |
2379 | __register_request(mdsc, req, dir); | |
2380 | __do_request(mdsc, req); | |
2381 | ||
e1518c7c SW |
2382 | if (req->r_err) { |
2383 | err = req->r_err; | |
e1518c7c | 2384 | goto out; |
2f2dc053 SW |
2385 | } |
2386 | ||
e1518c7c SW |
2387 | /* wait */ |
2388 | mutex_unlock(&mdsc->mutex); | |
2389 | dout("do_request waiting\n"); | |
5be73034 | 2390 | if (!req->r_timeout && req->r_wait_for_completion) { |
9280be24 | 2391 | err = req->r_wait_for_completion(mdsc, req); |
e1518c7c | 2392 | } else { |
5be73034 ID |
2393 | long timeleft = wait_for_completion_killable_timeout( |
2394 | &req->r_completion, | |
2395 | ceph_timeout_jiffies(req->r_timeout)); | |
2396 | if (timeleft > 0) | |
2397 | err = 0; | |
2398 | else if (!timeleft) | |
2399 | err = -EIO; /* timed out */ | |
2400 | else | |
2401 | err = timeleft; /* killed */ | |
e1518c7c SW |
2402 | } |
2403 | dout("do_request waited, got %d\n", err); | |
2404 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 2405 | |
e1518c7c | 2406 | /* only abort if we didn't race with a real reply */ |
bc2de10d | 2407 | if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { |
e1518c7c SW |
2408 | err = le32_to_cpu(req->r_reply_info.head->result); |
2409 | } else if (err < 0) { | |
2410 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
2411 | |
2412 | /* | |
2413 | * ensure we aren't running concurrently with | |
2414 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
2415 | * rely on locks (dir mutex) held by our caller. | |
2416 | */ | |
2417 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c | 2418 | req->r_err = err; |
bc2de10d | 2419 | set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); |
b4556396 | 2420 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 2421 | |
3dd69aab | 2422 | if (req->r_parent && |
167c9e35 SW |
2423 | (req->r_op & CEPH_MDS_OP_WRITE)) |
2424 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 2425 | } else { |
e1518c7c | 2426 | err = req->r_err; |
2f2dc053 | 2427 | } |
2f2dc053 | 2428 | |
e1518c7c SW |
2429 | out: |
2430 | mutex_unlock(&mdsc->mutex); | |
2f2dc053 SW |
2431 | dout("do_request %p done, result %d\n", req, err); |
2432 | return err; | |
2433 | } | |
2434 | ||
167c9e35 | 2435 | /* |
2f276c51 | 2436 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
2437 | * namespace request. |
2438 | */ | |
2439 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
2440 | { | |
3dd69aab | 2441 | struct inode *inode = req->r_parent; |
167c9e35 | 2442 | |
2f276c51 | 2443 | dout("invalidate_dir_request %p (complete, lease(s))\n", inode); |
167c9e35 | 2444 | |
2f276c51 | 2445 | ceph_dir_clear_complete(inode); |
167c9e35 SW |
2446 | if (req->r_dentry) |
2447 | ceph_invalidate_dentry_lease(req->r_dentry); | |
2448 | if (req->r_old_dentry) | |
2449 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
2450 | } | |
2451 | ||
2f2dc053 SW |
2452 | /* |
2453 | * Handle mds reply. | |
2454 | * | |
2455 | * We take the session mutex and parse and process the reply immediately. | |
2456 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
2457 | * by the MDS as they are applied to our local cache. | |
2458 | */ | |
2459 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
2460 | { | |
2461 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2462 | struct ceph_mds_request *req; | |
2463 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
2464 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
982d6011 | 2465 | struct ceph_snap_realm *realm; |
2f2dc053 SW |
2466 | u64 tid; |
2467 | int err, result; | |
2600d2dd | 2468 | int mds = session->s_mds; |
2f2dc053 | 2469 | |
2f2dc053 SW |
2470 | if (msg->front.iov_len < sizeof(*head)) { |
2471 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 2472 | ceph_msg_dump(msg); |
2f2dc053 SW |
2473 | return; |
2474 | } | |
2475 | ||
2476 | /* get request, session */ | |
6df058c0 | 2477 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 | 2478 | mutex_lock(&mdsc->mutex); |
fcd00b68 | 2479 | req = lookup_get_request(mdsc, tid); |
2f2dc053 SW |
2480 | if (!req) { |
2481 | dout("handle_reply on unknown tid %llu\n", tid); | |
2482 | mutex_unlock(&mdsc->mutex); | |
2483 | return; | |
2484 | } | |
2485 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
2486 | |
2487 | /* correct session? */ | |
d96d6049 | 2488 | if (req->r_session != session) { |
2f2dc053 SW |
2489 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
2490 | " not mds%d\n", tid, session->s_mds, | |
2491 | req->r_session ? req->r_session->s_mds : -1); | |
2492 | mutex_unlock(&mdsc->mutex); | |
2493 | goto out; | |
2494 | } | |
2495 | ||
2496 | /* dup? */ | |
bc2de10d JL |
2497 | if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) || |
2498 | (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) { | |
f3ae1b97 | 2499 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
2500 | head->safe ? "safe" : "unsafe", tid, mds); |
2501 | mutex_unlock(&mdsc->mutex); | |
2502 | goto out; | |
2503 | } | |
bc2de10d | 2504 | if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) { |
f3ae1b97 | 2505 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
2506 | tid, mds); |
2507 | mutex_unlock(&mdsc->mutex); | |
2508 | goto out; | |
2509 | } | |
2f2dc053 SW |
2510 | |
2511 | result = le32_to_cpu(head->result); | |
2512 | ||
2513 | /* | |
e55b71f8 GF |
2514 | * Handle an ESTALE |
2515 | * if we're not talking to the authority, send to them | |
2516 | * if the authority has changed while we weren't looking, | |
2517 | * send to new authority | |
2518 | * Otherwise we just have to return an ESTALE | |
2f2dc053 SW |
2519 | */ |
2520 | if (result == -ESTALE) { | |
e55b71f8 | 2521 | dout("got ESTALE on request %llu", req->r_tid); |
51da8e8c | 2522 | req->r_resend_mds = -1; |
ca18bede | 2523 | if (req->r_direct_mode != USE_AUTH_MDS) { |
e55b71f8 GF |
2524 | dout("not using auth, setting for that now"); |
2525 | req->r_direct_mode = USE_AUTH_MDS; | |
2f2dc053 SW |
2526 | __do_request(mdsc, req); |
2527 | mutex_unlock(&mdsc->mutex); | |
2528 | goto out; | |
e55b71f8 | 2529 | } else { |
ca18bede YZ |
2530 | int mds = __choose_mds(mdsc, req); |
2531 | if (mds >= 0 && mds != req->r_session->s_mds) { | |
2532 | dout("but auth changed, so resending"); | |
e55b71f8 GF |
2533 | __do_request(mdsc, req); |
2534 | mutex_unlock(&mdsc->mutex); | |
2535 | goto out; | |
2536 | } | |
2f2dc053 | 2537 | } |
e55b71f8 | 2538 | dout("have to return ESTALE on request %llu", req->r_tid); |
2f2dc053 SW |
2539 | } |
2540 | ||
e55b71f8 | 2541 | |
2f2dc053 | 2542 | if (head->safe) { |
bc2de10d | 2543 | set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags); |
2f2dc053 | 2544 | __unregister_request(mdsc, req); |
2f2dc053 | 2545 | |
bc2de10d | 2546 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { |
2f2dc053 SW |
2547 | /* |
2548 | * We already handled the unsafe response, now do the | |
2549 | * cleanup. No need to examine the response; the MDS | |
2550 | * doesn't include any result info in the safe | |
2551 | * response. And even if it did, there is nothing | |
2552 | * useful we could do with a revised return value. | |
2553 | */ | |
2554 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2f2dc053 SW |
2555 | |
2556 | /* last unsafe request during umount? */ | |
44ca18f2 | 2557 | if (mdsc->stopping && !__get_oldest_req(mdsc)) |
03066f23 | 2558 | complete_all(&mdsc->safe_umount_waiters); |
2f2dc053 SW |
2559 | mutex_unlock(&mdsc->mutex); |
2560 | goto out; | |
2561 | } | |
e1518c7c | 2562 | } else { |
bc2de10d | 2563 | set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags); |
2f2dc053 | 2564 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); |
4c06ace8 YZ |
2565 | if (req->r_unsafe_dir) { |
2566 | struct ceph_inode_info *ci = | |
2567 | ceph_inode(req->r_unsafe_dir); | |
2568 | spin_lock(&ci->i_unsafe_lock); | |
2569 | list_add_tail(&req->r_unsafe_dir_item, | |
2570 | &ci->i_unsafe_dirops); | |
2571 | spin_unlock(&ci->i_unsafe_lock); | |
2572 | } | |
2f2dc053 SW |
2573 | } |
2574 | ||
2575 | dout("handle_reply tid %lld result %d\n", tid, result); | |
2576 | rinfo = &req->r_reply_info; | |
14303d20 | 2577 | err = parse_reply_info(msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
2578 | mutex_unlock(&mdsc->mutex); |
2579 | ||
2580 | mutex_lock(&session->s_mutex); | |
2581 | if (err < 0) { | |
25933abd | 2582 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 2583 | ceph_msg_dump(msg); |
2f2dc053 SW |
2584 | goto out_err; |
2585 | } | |
2586 | ||
2587 | /* snap trace */ | |
982d6011 | 2588 | realm = NULL; |
2f2dc053 SW |
2589 | if (rinfo->snapblob_len) { |
2590 | down_write(&mdsc->snap_rwsem); | |
2591 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
982d6011 YZ |
2592 | rinfo->snapblob + rinfo->snapblob_len, |
2593 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, | |
2594 | &realm); | |
2f2dc053 SW |
2595 | downgrade_write(&mdsc->snap_rwsem); |
2596 | } else { | |
2597 | down_read(&mdsc->snap_rwsem); | |
2598 | } | |
2599 | ||
2600 | /* insert trace into our cache */ | |
b4556396 | 2601 | mutex_lock(&req->r_fill_mutex); |
315f2408 | 2602 | current->journal_info = req; |
f5a03b08 | 2603 | err = ceph_fill_trace(mdsc->fsc->sb, req); |
2f2dc053 | 2604 | if (err == 0) { |
6e8575fa | 2605 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 2606 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 2607 | ceph_readdir_prepopulate(req, req->r_session); |
37151668 | 2608 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); |
2f2dc053 | 2609 | } |
315f2408 | 2610 | current->journal_info = NULL; |
b4556396 | 2611 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
2612 | |
2613 | up_read(&mdsc->snap_rwsem); | |
982d6011 YZ |
2614 | if (realm) |
2615 | ceph_put_snap_realm(mdsc, realm); | |
68cd5b4b | 2616 | |
bc2de10d JL |
2617 | if (err == 0 && req->r_target_inode && |
2618 | test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { | |
68cd5b4b YZ |
2619 | struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); |
2620 | spin_lock(&ci->i_unsafe_lock); | |
2621 | list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops); | |
2622 | spin_unlock(&ci->i_unsafe_lock); | |
2623 | } | |
2f2dc053 | 2624 | out_err: |
e1518c7c | 2625 | mutex_lock(&mdsc->mutex); |
bc2de10d | 2626 | if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { |
e1518c7c SW |
2627 | if (err) { |
2628 | req->r_err = err; | |
2629 | } else { | |
5fdb1389 | 2630 | req->r_reply = ceph_msg_get(msg); |
bc2de10d | 2631 | set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags); |
e1518c7c | 2632 | } |
2f2dc053 | 2633 | } else { |
e1518c7c | 2634 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 2635 | } |
e1518c7c | 2636 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 2637 | |
2f2dc053 SW |
2638 | mutex_unlock(&session->s_mutex); |
2639 | ||
2640 | /* kick calling process */ | |
2641 | complete_request(mdsc, req); | |
2642 | out: | |
2643 | ceph_mdsc_put_request(req); | |
2644 | return; | |
2645 | } | |
2646 | ||
2647 | ||
2648 | ||
2649 | /* | |
2650 | * handle mds notification that our request has been forwarded. | |
2651 | */ | |
2600d2dd SW |
2652 | static void handle_forward(struct ceph_mds_client *mdsc, |
2653 | struct ceph_mds_session *session, | |
2654 | struct ceph_msg *msg) | |
2f2dc053 SW |
2655 | { |
2656 | struct ceph_mds_request *req; | |
a1ea787c | 2657 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
2658 | u32 next_mds; |
2659 | u32 fwd_seq; | |
2f2dc053 SW |
2660 | int err = -EINVAL; |
2661 | void *p = msg->front.iov_base; | |
2662 | void *end = p + msg->front.iov_len; | |
2f2dc053 | 2663 | |
a1ea787c | 2664 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
2665 | next_mds = ceph_decode_32(&p); |
2666 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
2667 | |
2668 | mutex_lock(&mdsc->mutex); | |
fcd00b68 | 2669 | req = lookup_get_request(mdsc, tid); |
2f2dc053 | 2670 | if (!req) { |
2a8e5e36 | 2671 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
2f2dc053 SW |
2672 | goto out; /* dup reply? */ |
2673 | } | |
2674 | ||
bc2de10d | 2675 | if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { |
2a8e5e36 SW |
2676 | dout("forward tid %llu aborted, unregistering\n", tid); |
2677 | __unregister_request(mdsc, req); | |
2678 | } else if (fwd_seq <= req->r_num_fwd) { | |
2679 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
2f2dc053 SW |
2680 | tid, next_mds, req->r_num_fwd, fwd_seq); |
2681 | } else { | |
2682 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
2683 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
2684 | BUG_ON(req->r_err); | |
bc2de10d | 2685 | BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)); |
3de22be6 | 2686 | req->r_attempts = 0; |
2f2dc053 SW |
2687 | req->r_num_fwd = fwd_seq; |
2688 | req->r_resend_mds = next_mds; | |
2689 | put_request_session(req); | |
2690 | __do_request(mdsc, req); | |
2691 | } | |
2692 | ceph_mdsc_put_request(req); | |
2693 | out: | |
2694 | mutex_unlock(&mdsc->mutex); | |
2695 | return; | |
2696 | ||
2697 | bad: | |
2698 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
2699 | } | |
2700 | ||
2701 | /* | |
2702 | * handle a mds session control message | |
2703 | */ | |
2704 | static void handle_session(struct ceph_mds_session *session, | |
2705 | struct ceph_msg *msg) | |
2706 | { | |
2707 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2708 | u32 op; | |
2709 | u64 seq; | |
2600d2dd | 2710 | int mds = session->s_mds; |
2f2dc053 SW |
2711 | struct ceph_mds_session_head *h = msg->front.iov_base; |
2712 | int wake = 0; | |
2713 | ||
2f2dc053 SW |
2714 | /* decode */ |
2715 | if (msg->front.iov_len != sizeof(*h)) | |
2716 | goto bad; | |
2717 | op = le32_to_cpu(h->op); | |
2718 | seq = le64_to_cpu(h->seq); | |
2719 | ||
2720 | mutex_lock(&mdsc->mutex); | |
0a07fc8c YZ |
2721 | if (op == CEPH_SESSION_CLOSE) { |
2722 | get_session(session); | |
2600d2dd | 2723 | __unregister_session(mdsc, session); |
0a07fc8c | 2724 | } |
2f2dc053 SW |
2725 | /* FIXME: this ttl calculation is generous */ |
2726 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
2727 | mutex_unlock(&mdsc->mutex); | |
2728 | ||
2729 | mutex_lock(&session->s_mutex); | |
2730 | ||
2731 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
2732 | mds, ceph_session_op_name(op), session, | |
a687ecaf | 2733 | ceph_session_state_name(session->s_state), seq); |
2f2dc053 SW |
2734 | |
2735 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
2736 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
2737 | pr_info("mds%d came back\n", session->s_mds); | |
2738 | } | |
2739 | ||
2740 | switch (op) { | |
2741 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
2742 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2743 | pr_info("mds%d reconnect success\n", session->s_mds); | |
2f2dc053 SW |
2744 | session->s_state = CEPH_MDS_SESSION_OPEN; |
2745 | renewed_caps(mdsc, session, 0); | |
2746 | wake = 1; | |
2747 | if (mdsc->stopping) | |
2748 | __close_session(mdsc, session); | |
2749 | break; | |
2750 | ||
2751 | case CEPH_SESSION_RENEWCAPS: | |
2752 | if (session->s_renew_seq == seq) | |
2753 | renewed_caps(mdsc, session, 1); | |
2754 | break; | |
2755 | ||
2756 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
2757 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
2758 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
1c841a96 | 2759 | cleanup_session_requests(mdsc, session); |
2f2dc053 | 2760 | remove_session_caps(session); |
656e4382 | 2761 | wake = 2; /* for good measure */ |
f3c60c59 | 2762 | wake_up_all(&mdsc->session_close_wq); |
2f2dc053 SW |
2763 | break; |
2764 | ||
2765 | case CEPH_SESSION_STALE: | |
2766 | pr_info("mds%d caps went stale, renewing\n", | |
2767 | session->s_mds); | |
d8fb02ab | 2768 | spin_lock(&session->s_gen_ttl_lock); |
2f2dc053 | 2769 | session->s_cap_gen++; |
1ce208a6 | 2770 | session->s_cap_ttl = jiffies - 1; |
d8fb02ab | 2771 | spin_unlock(&session->s_gen_ttl_lock); |
2f2dc053 SW |
2772 | send_renew_caps(mdsc, session); |
2773 | break; | |
2774 | ||
2775 | case CEPH_SESSION_RECALL_STATE: | |
2776 | trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); | |
2777 | break; | |
2778 | ||
186e4f7a YZ |
2779 | case CEPH_SESSION_FLUSHMSG: |
2780 | send_flushmsg_ack(mdsc, session, seq); | |
2781 | break; | |
2782 | ||
03f4fcb0 YZ |
2783 | case CEPH_SESSION_FORCE_RO: |
2784 | dout("force_session_readonly %p\n", session); | |
2785 | spin_lock(&session->s_cap_lock); | |
2786 | session->s_readonly = true; | |
2787 | spin_unlock(&session->s_cap_lock); | |
2788 | wake_up_session_caps(session, 0); | |
2789 | break; | |
2790 | ||
fcff415c YZ |
2791 | case CEPH_SESSION_REJECT: |
2792 | WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING); | |
2793 | pr_info("mds%d rejected session\n", session->s_mds); | |
2794 | session->s_state = CEPH_MDS_SESSION_REJECTED; | |
2795 | cleanup_session_requests(mdsc, session); | |
2796 | remove_session_caps(session); | |
2797 | wake = 2; /* for good measure */ | |
2798 | break; | |
2799 | ||
2f2dc053 SW |
2800 | default: |
2801 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
2802 | WARN_ON(1); | |
2803 | } | |
2804 | ||
2805 | mutex_unlock(&session->s_mutex); | |
2806 | if (wake) { | |
2807 | mutex_lock(&mdsc->mutex); | |
2808 | __wake_requests(mdsc, &session->s_waiting); | |
656e4382 YZ |
2809 | if (wake == 2) |
2810 | kick_requests(mdsc, mds); | |
2f2dc053 SW |
2811 | mutex_unlock(&mdsc->mutex); |
2812 | } | |
0a07fc8c YZ |
2813 | if (op == CEPH_SESSION_CLOSE) |
2814 | ceph_put_mds_session(session); | |
2f2dc053 SW |
2815 | return; |
2816 | ||
2817 | bad: | |
2818 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
2819 | (int)msg->front.iov_len); | |
9ec7cab1 | 2820 | ceph_msg_dump(msg); |
2f2dc053 SW |
2821 | return; |
2822 | } | |
2823 | ||
2824 | ||
2825 | /* | |
2826 | * called under session->mutex. | |
2827 | */ | |
2828 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
2829 | struct ceph_mds_session *session) | |
2830 | { | |
2831 | struct ceph_mds_request *req, *nreq; | |
3de22be6 | 2832 | struct rb_node *p; |
2f2dc053 SW |
2833 | int err; |
2834 | ||
2835 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
2836 | ||
2837 | mutex_lock(&mdsc->mutex); | |
2838 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) { | |
6e6f0923 | 2839 | err = __prepare_send_request(mdsc, req, session->s_mds, true); |
2f2dc053 SW |
2840 | if (!err) { |
2841 | ceph_msg_get(req->r_request); | |
2842 | ceph_con_send(&session->s_con, req->r_request); | |
2843 | } | |
2844 | } | |
3de22be6 YZ |
2845 | |
2846 | /* | |
2847 | * also re-send old requests when MDS enters reconnect stage. So that MDS | |
2848 | * can process completed request in clientreplay stage. | |
2849 | */ | |
2850 | p = rb_first(&mdsc->request_tree); | |
2851 | while (p) { | |
2852 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
2853 | p = rb_next(p); | |
bc2de10d | 2854 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
3de22be6 YZ |
2855 | continue; |
2856 | if (req->r_attempts == 0) | |
2857 | continue; /* only old requests */ | |
2858 | if (req->r_session && | |
2859 | req->r_session->s_mds == session->s_mds) { | |
6e6f0923 YZ |
2860 | err = __prepare_send_request(mdsc, req, |
2861 | session->s_mds, true); | |
3de22be6 YZ |
2862 | if (!err) { |
2863 | ceph_msg_get(req->r_request); | |
2864 | ceph_con_send(&session->s_con, req->r_request); | |
2865 | } | |
2866 | } | |
2867 | } | |
2f2dc053 SW |
2868 | mutex_unlock(&mdsc->mutex); |
2869 | } | |
2870 | ||
2871 | /* | |
2872 | * Encode information about a cap for a reconnect with the MDS. | |
2873 | */ | |
2f2dc053 SW |
2874 | static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2875 | void *arg) | |
2876 | { | |
20cb34ae SW |
2877 | union { |
2878 | struct ceph_mds_cap_reconnect v2; | |
2879 | struct ceph_mds_cap_reconnect_v1 v1; | |
2880 | } rec; | |
b3f8d68f | 2881 | struct ceph_inode_info *ci = cap->ci; |
20cb34ae SW |
2882 | struct ceph_reconnect_state *recon_state = arg; |
2883 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
2f2dc053 SW |
2884 | char *path; |
2885 | int pathlen, err; | |
2886 | u64 pathbase; | |
3469ed0d | 2887 | u64 snap_follows; |
2f2dc053 SW |
2888 | struct dentry *dentry; |
2889 | ||
2f2dc053 SW |
2890 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", |
2891 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
2892 | ceph_cap_string(cap->issued)); | |
93cea5be SW |
2893 | err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
2894 | if (err) | |
2895 | return err; | |
2f2dc053 SW |
2896 | |
2897 | dentry = d_find_alias(inode); | |
2898 | if (dentry) { | |
2899 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0); | |
2900 | if (IS_ERR(path)) { | |
2901 | err = PTR_ERR(path); | |
e072f8aa | 2902 | goto out_dput; |
2f2dc053 SW |
2903 | } |
2904 | } else { | |
2905 | path = NULL; | |
2906 | pathlen = 0; | |
4eacd4cb | 2907 | pathbase = 0; |
2f2dc053 | 2908 | } |
2f2dc053 | 2909 | |
be655596 | 2910 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
2911 | cap->seq = 0; /* reset cap seq */ |
2912 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 2913 | cap->mseq = 0; /* and migrate_seq */ |
99a9c273 | 2914 | cap->cap_gen = cap->session->s_cap_gen; |
20cb34ae | 2915 | |
121f22a1 | 2916 | if (recon_state->msg_version >= 2) { |
20cb34ae SW |
2917 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); |
2918 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2919 | rec.v2.issued = cpu_to_le32(cap->issued); | |
2920 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2921 | rec.v2.pathbase = cpu_to_le64(pathbase); | |
ec1dff25 JL |
2922 | rec.v2.flock_len = (__force __le32) |
2923 | ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1); | |
20cb34ae SW |
2924 | } else { |
2925 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
2926 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
2927 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2928 | rec.v1.size = cpu_to_le64(inode->i_size); | |
2929 | ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime); | |
2930 | ceph_encode_timespec(&rec.v1.atime, &inode->i_atime); | |
2931 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
2932 | rec.v1.pathbase = cpu_to_le64(pathbase); | |
20cb34ae | 2933 | } |
3469ed0d YZ |
2934 | |
2935 | if (list_empty(&ci->i_cap_snaps)) { | |
92776fd2 | 2936 | snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0; |
3469ed0d YZ |
2937 | } else { |
2938 | struct ceph_cap_snap *capsnap = | |
2939 | list_first_entry(&ci->i_cap_snaps, | |
2940 | struct ceph_cap_snap, ci_item); | |
2941 | snap_follows = capsnap->follows; | |
20cb34ae | 2942 | } |
be655596 | 2943 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 2944 | |
121f22a1 | 2945 | if (recon_state->msg_version >= 2) { |
40819f6f | 2946 | int num_fcntl_locks, num_flock_locks; |
4deb14a2 | 2947 | struct ceph_filelock *flocks = NULL; |
121f22a1 YZ |
2948 | size_t struct_len, total_len = 0; |
2949 | u8 struct_v = 0; | |
39be95e9 JS |
2950 | |
2951 | encode_again: | |
b3f8d68f YZ |
2952 | if (rec.v2.flock_len) { |
2953 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); | |
2954 | } else { | |
2955 | num_fcntl_locks = 0; | |
2956 | num_flock_locks = 0; | |
2957 | } | |
4deb14a2 YZ |
2958 | if (num_fcntl_locks + num_flock_locks > 0) { |
2959 | flocks = kmalloc((num_fcntl_locks + num_flock_locks) * | |
2960 | sizeof(struct ceph_filelock), GFP_NOFS); | |
2961 | if (!flocks) { | |
2962 | err = -ENOMEM; | |
2963 | goto out_free; | |
2964 | } | |
2965 | err = ceph_encode_locks_to_buffer(inode, flocks, | |
2966 | num_fcntl_locks, | |
2967 | num_flock_locks); | |
2968 | if (err) { | |
2969 | kfree(flocks); | |
2970 | flocks = NULL; | |
2971 | if (err == -ENOSPC) | |
2972 | goto encode_again; | |
2973 | goto out_free; | |
2974 | } | |
2975 | } else { | |
39be95e9 | 2976 | kfree(flocks); |
4deb14a2 | 2977 | flocks = NULL; |
39be95e9 | 2978 | } |
121f22a1 YZ |
2979 | |
2980 | if (recon_state->msg_version >= 3) { | |
2981 | /* version, compat_version and struct_len */ | |
2982 | total_len = 2 * sizeof(u8) + sizeof(u32); | |
3469ed0d | 2983 | struct_v = 2; |
121f22a1 | 2984 | } |
39be95e9 JS |
2985 | /* |
2986 | * number of encoded locks is stable, so copy to pagelist | |
2987 | */ | |
121f22a1 YZ |
2988 | struct_len = 2 * sizeof(u32) + |
2989 | (num_fcntl_locks + num_flock_locks) * | |
2990 | sizeof(struct ceph_filelock); | |
2991 | rec.v2.flock_len = cpu_to_le32(struct_len); | |
2992 | ||
2993 | struct_len += sizeof(rec.v2); | |
2994 | struct_len += sizeof(u32) + pathlen; | |
2995 | ||
3469ed0d YZ |
2996 | if (struct_v >= 2) |
2997 | struct_len += sizeof(u64); /* snap_follows */ | |
2998 | ||
121f22a1 YZ |
2999 | total_len += struct_len; |
3000 | err = ceph_pagelist_reserve(pagelist, total_len); | |
3001 | ||
3002 | if (!err) { | |
3003 | if (recon_state->msg_version >= 3) { | |
3004 | ceph_pagelist_encode_8(pagelist, struct_v); | |
3005 | ceph_pagelist_encode_8(pagelist, 1); | |
3006 | ceph_pagelist_encode_32(pagelist, struct_len); | |
3007 | } | |
3008 | ceph_pagelist_encode_string(pagelist, path, pathlen); | |
3009 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2)); | |
3010 | ceph_locks_to_pagelist(flocks, pagelist, | |
3011 | num_fcntl_locks, | |
3012 | num_flock_locks); | |
3469ed0d YZ |
3013 | if (struct_v >= 2) |
3014 | ceph_pagelist_encode_64(pagelist, snap_follows); | |
121f22a1 | 3015 | } |
39be95e9 | 3016 | kfree(flocks); |
3612abbd | 3017 | } else { |
121f22a1 YZ |
3018 | size_t size = sizeof(u32) + pathlen + sizeof(rec.v1); |
3019 | err = ceph_pagelist_reserve(pagelist, size); | |
3020 | if (!err) { | |
3021 | ceph_pagelist_encode_string(pagelist, path, pathlen); | |
3022 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1)); | |
3023 | } | |
40819f6f | 3024 | } |
44c99757 YZ |
3025 | |
3026 | recon_state->nr_caps++; | |
e072f8aa | 3027 | out_free: |
2f2dc053 | 3028 | kfree(path); |
e072f8aa | 3029 | out_dput: |
2f2dc053 | 3030 | dput(dentry); |
93cea5be | 3031 | return err; |
2f2dc053 SW |
3032 | } |
3033 | ||
3034 | ||
3035 | /* | |
3036 | * If an MDS fails and recovers, clients need to reconnect in order to | |
3037 | * reestablish shared state. This includes all caps issued through | |
3038 | * this session _and_ the snap_realm hierarchy. Because it's not | |
3039 | * clear which snap realms the mds cares about, we send everything we | |
3040 | * know about.. that ensures we'll then get any new info the | |
3041 | * recovering MDS might have. | |
3042 | * | |
3043 | * This is a relatively heavyweight operation, but it's rare. | |
3044 | * | |
3045 | * called with mdsc->mutex held. | |
3046 | */ | |
34b6c855 SW |
3047 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
3048 | struct ceph_mds_session *session) | |
2f2dc053 | 3049 | { |
2f2dc053 | 3050 | struct ceph_msg *reply; |
a105f00c | 3051 | struct rb_node *p; |
34b6c855 | 3052 | int mds = session->s_mds; |
9abf82b8 | 3053 | int err = -ENOMEM; |
44c99757 | 3054 | int s_nr_caps; |
93cea5be | 3055 | struct ceph_pagelist *pagelist; |
20cb34ae | 3056 | struct ceph_reconnect_state recon_state; |
c8a96a31 | 3057 | LIST_HEAD(dispose); |
2f2dc053 | 3058 | |
34b6c855 | 3059 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 3060 | |
93cea5be SW |
3061 | pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS); |
3062 | if (!pagelist) | |
3063 | goto fail_nopagelist; | |
3064 | ceph_pagelist_init(pagelist); | |
3065 | ||
b61c2763 | 3066 | reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false); |
a79832f2 | 3067 | if (!reply) |
93cea5be | 3068 | goto fail_nomsg; |
93cea5be | 3069 | |
34b6c855 SW |
3070 | mutex_lock(&session->s_mutex); |
3071 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
3072 | session->s_seq = 0; | |
2f2dc053 | 3073 | |
2f2dc053 | 3074 | dout("session %p state %s\n", session, |
a687ecaf | 3075 | ceph_session_state_name(session->s_state)); |
2f2dc053 | 3076 | |
99a9c273 YZ |
3077 | spin_lock(&session->s_gen_ttl_lock); |
3078 | session->s_cap_gen++; | |
3079 | spin_unlock(&session->s_gen_ttl_lock); | |
3080 | ||
3081 | spin_lock(&session->s_cap_lock); | |
03f4fcb0 YZ |
3082 | /* don't know if session is readonly */ |
3083 | session->s_readonly = 0; | |
99a9c273 YZ |
3084 | /* |
3085 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
3086 | * If a cap get released before being added to the cap reconnect, | |
3087 | * __ceph_remove_cap() should skip queuing cap release. | |
3088 | */ | |
3089 | session->s_cap_reconnect = 1; | |
e01a5946 | 3090 | /* drop old cap expires; we're about to reestablish that state */ |
c8a96a31 JL |
3091 | detach_cap_releases(session, &dispose); |
3092 | spin_unlock(&session->s_cap_lock); | |
3093 | dispose_cap_releases(mdsc, &dispose); | |
e01a5946 | 3094 | |
5d23371f | 3095 | /* trim unused caps to reduce MDS's cache rejoin time */ |
c0bd50e2 YZ |
3096 | if (mdsc->fsc->sb->s_root) |
3097 | shrink_dcache_parent(mdsc->fsc->sb->s_root); | |
5d23371f YZ |
3098 | |
3099 | ceph_con_close(&session->s_con); | |
3100 | ceph_con_open(&session->s_con, | |
3101 | CEPH_ENTITY_TYPE_MDS, mds, | |
3102 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
3103 | ||
3104 | /* replay unsafe requests */ | |
3105 | replay_unsafe_requests(mdsc, session); | |
3106 | ||
3107 | down_read(&mdsc->snap_rwsem); | |
3108 | ||
2f2dc053 | 3109 | /* traverse this session's caps */ |
44c99757 YZ |
3110 | s_nr_caps = session->s_nr_caps; |
3111 | err = ceph_pagelist_encode_32(pagelist, s_nr_caps); | |
93cea5be SW |
3112 | if (err) |
3113 | goto fail; | |
20cb34ae | 3114 | |
44c99757 | 3115 | recon_state.nr_caps = 0; |
20cb34ae | 3116 | recon_state.pagelist = pagelist; |
121f22a1 YZ |
3117 | if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) |
3118 | recon_state.msg_version = 3; | |
3119 | else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK) | |
3120 | recon_state.msg_version = 2; | |
3121 | else | |
3122 | recon_state.msg_version = 1; | |
20cb34ae | 3123 | err = iterate_session_caps(session, encode_caps_cb, &recon_state); |
2f2dc053 | 3124 | if (err < 0) |
9abf82b8 | 3125 | goto fail; |
2f2dc053 | 3126 | |
99a9c273 YZ |
3127 | spin_lock(&session->s_cap_lock); |
3128 | session->s_cap_reconnect = 0; | |
3129 | spin_unlock(&session->s_cap_lock); | |
3130 | ||
2f2dc053 SW |
3131 | /* |
3132 | * snaprealms. we provide mds with the ino, seq (version), and | |
3133 | * parent for all of our realms. If the mds has any newer info, | |
3134 | * it will tell us. | |
3135 | */ | |
a105f00c SW |
3136 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { |
3137 | struct ceph_snap_realm *realm = | |
3138 | rb_entry(p, struct ceph_snap_realm, node); | |
93cea5be | 3139 | struct ceph_mds_snaprealm_reconnect sr_rec; |
2f2dc053 SW |
3140 | |
3141 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
3142 | realm->ino, realm->seq, realm->parent_ino); | |
93cea5be SW |
3143 | sr_rec.ino = cpu_to_le64(realm->ino); |
3144 | sr_rec.seq = cpu_to_le64(realm->seq); | |
3145 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
3146 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
3147 | if (err) | |
3148 | goto fail; | |
2f2dc053 | 3149 | } |
2f2dc053 | 3150 | |
121f22a1 | 3151 | reply->hdr.version = cpu_to_le16(recon_state.msg_version); |
44c99757 YZ |
3152 | |
3153 | /* raced with cap release? */ | |
3154 | if (s_nr_caps != recon_state.nr_caps) { | |
3155 | struct page *page = list_first_entry(&pagelist->head, | |
3156 | struct page, lru); | |
3157 | __le32 *addr = kmap_atomic(page); | |
3158 | *addr = cpu_to_le32(recon_state.nr_caps); | |
3159 | kunmap_atomic(addr); | |
ebf18f47 | 3160 | } |
44c99757 YZ |
3161 | |
3162 | reply->hdr.data_len = cpu_to_le32(pagelist->length); | |
3163 | ceph_msg_data_add_pagelist(reply, pagelist); | |
e548e9b9 YZ |
3164 | |
3165 | ceph_early_kick_flushing_caps(mdsc, session); | |
3166 | ||
2f2dc053 SW |
3167 | ceph_con_send(&session->s_con, reply); |
3168 | ||
9abf82b8 SW |
3169 | mutex_unlock(&session->s_mutex); |
3170 | ||
3171 | mutex_lock(&mdsc->mutex); | |
3172 | __wake_requests(mdsc, &session->s_waiting); | |
3173 | mutex_unlock(&mdsc->mutex); | |
3174 | ||
2f2dc053 | 3175 | up_read(&mdsc->snap_rwsem); |
2f2dc053 SW |
3176 | return; |
3177 | ||
93cea5be | 3178 | fail: |
2f2dc053 | 3179 | ceph_msg_put(reply); |
9abf82b8 SW |
3180 | up_read(&mdsc->snap_rwsem); |
3181 | mutex_unlock(&session->s_mutex); | |
93cea5be SW |
3182 | fail_nomsg: |
3183 | ceph_pagelist_release(pagelist); | |
93cea5be | 3184 | fail_nopagelist: |
9abf82b8 | 3185 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 3186 | return; |
2f2dc053 SW |
3187 | } |
3188 | ||
3189 | ||
3190 | /* | |
3191 | * compare old and new mdsmaps, kicking requests | |
3192 | * and closing out old connections as necessary | |
3193 | * | |
3194 | * called under mdsc->mutex. | |
3195 | */ | |
3196 | static void check_new_map(struct ceph_mds_client *mdsc, | |
3197 | struct ceph_mdsmap *newmap, | |
3198 | struct ceph_mdsmap *oldmap) | |
3199 | { | |
3200 | int i; | |
3201 | int oldstate, newstate; | |
3202 | struct ceph_mds_session *s; | |
3203 | ||
3204 | dout("check_new_map new %u old %u\n", | |
3205 | newmap->m_epoch, oldmap->m_epoch); | |
3206 | ||
76201b63 | 3207 | for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) { |
d37b1d99 | 3208 | if (!mdsc->sessions[i]) |
2f2dc053 SW |
3209 | continue; |
3210 | s = mdsc->sessions[i]; | |
3211 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
3212 | newstate = ceph_mdsmap_get_state(newmap, i); | |
3213 | ||
0deb01c9 | 3214 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 3215 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 3216 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 3217 | ceph_mds_state_name(newstate), |
0deb01c9 | 3218 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
a687ecaf | 3219 | ceph_session_state_name(s->s_state)); |
2f2dc053 | 3220 | |
76201b63 | 3221 | if (i >= newmap->m_num_mds || |
3e8f43a0 | 3222 | memcmp(ceph_mdsmap_get_addr(oldmap, i), |
2f2dc053 SW |
3223 | ceph_mdsmap_get_addr(newmap, i), |
3224 | sizeof(struct ceph_entity_addr))) { | |
3225 | if (s->s_state == CEPH_MDS_SESSION_OPENING) { | |
3226 | /* the session never opened, just close it | |
3227 | * out now */ | |
0a07fc8c | 3228 | get_session(s); |
2600d2dd | 3229 | __unregister_session(mdsc, s); |
2f2dc053 | 3230 | __wake_requests(mdsc, &s->s_waiting); |
0a07fc8c | 3231 | ceph_put_mds_session(s); |
2827528d YZ |
3232 | } else if (i >= newmap->m_num_mds) { |
3233 | /* force close session for stopped mds */ | |
3234 | get_session(s); | |
2600d2dd | 3235 | __unregister_session(mdsc, s); |
2827528d YZ |
3236 | __wake_requests(mdsc, &s->s_waiting); |
3237 | kick_requests(mdsc, i); | |
3238 | mutex_unlock(&mdsc->mutex); | |
3239 | ||
3240 | mutex_lock(&s->s_mutex); | |
3241 | cleanup_session_requests(mdsc, s); | |
3242 | remove_session_caps(s); | |
3243 | mutex_unlock(&s->s_mutex); | |
3244 | ||
3245 | ceph_put_mds_session(s); | |
3246 | ||
3247 | mutex_lock(&mdsc->mutex); | |
2f2dc053 SW |
3248 | } else { |
3249 | /* just close it */ | |
3250 | mutex_unlock(&mdsc->mutex); | |
3251 | mutex_lock(&s->s_mutex); | |
3252 | mutex_lock(&mdsc->mutex); | |
3253 | ceph_con_close(&s->s_con); | |
3254 | mutex_unlock(&s->s_mutex); | |
3255 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
3256 | } | |
2f2dc053 SW |
3257 | } else if (oldstate == newstate) { |
3258 | continue; /* nothing new with this mds */ | |
3259 | } | |
3260 | ||
3261 | /* | |
3262 | * send reconnect? | |
3263 | */ | |
3264 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
3265 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
3266 | mutex_unlock(&mdsc->mutex); | |
3267 | send_mds_reconnect(mdsc, s); | |
3268 | mutex_lock(&mdsc->mutex); | |
3269 | } | |
2f2dc053 SW |
3270 | |
3271 | /* | |
29790f26 | 3272 | * kick request on any mds that has gone active. |
2f2dc053 SW |
3273 | */ |
3274 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
3275 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
3276 | if (oldstate != CEPH_MDS_STATE_CREATING && |
3277 | oldstate != CEPH_MDS_STATE_STARTING) | |
3278 | pr_info("mds%d recovery completed\n", s->s_mds); | |
3279 | kick_requests(mdsc, i); | |
2f2dc053 | 3280 | ceph_kick_flushing_caps(mdsc, s); |
0dc2570f | 3281 | wake_up_session_caps(s, 1); |
2f2dc053 SW |
3282 | } |
3283 | } | |
cb170a22 | 3284 | |
76201b63 | 3285 | for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) { |
cb170a22 SW |
3286 | s = mdsc->sessions[i]; |
3287 | if (!s) | |
3288 | continue; | |
3289 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
3290 | continue; | |
3291 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
3292 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
3293 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3294 | dout(" connecting to export targets of laggy mds%d\n", | |
3295 | i); | |
3296 | __open_export_target_sessions(mdsc, s); | |
3297 | } | |
3298 | } | |
2f2dc053 SW |
3299 | } |
3300 | ||
3301 | ||
3302 | ||
3303 | /* | |
3304 | * leases | |
3305 | */ | |
3306 | ||
3307 | /* | |
3308 | * caller must hold session s_mutex, dentry->d_lock | |
3309 | */ | |
3310 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
3311 | { | |
3312 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
3313 | ||
3314 | ceph_put_mds_session(di->lease_session); | |
3315 | di->lease_session = NULL; | |
3316 | } | |
3317 | ||
2600d2dd SW |
3318 | static void handle_lease(struct ceph_mds_client *mdsc, |
3319 | struct ceph_mds_session *session, | |
3320 | struct ceph_msg *msg) | |
2f2dc053 | 3321 | { |
3d14c5d2 | 3322 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 3323 | struct inode *inode; |
2f2dc053 SW |
3324 | struct dentry *parent, *dentry; |
3325 | struct ceph_dentry_info *di; | |
2600d2dd | 3326 | int mds = session->s_mds; |
2f2dc053 | 3327 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 3328 | u32 seq; |
2f2dc053 | 3329 | struct ceph_vino vino; |
2f2dc053 SW |
3330 | struct qstr dname; |
3331 | int release = 0; | |
3332 | ||
2f2dc053 SW |
3333 | dout("handle_lease from mds%d\n", mds); |
3334 | ||
3335 | /* decode */ | |
3336 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
3337 | goto bad; | |
3338 | vino.ino = le64_to_cpu(h->ino); | |
3339 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 3340 | seq = le32_to_cpu(h->seq); |
2f2dc053 SW |
3341 | dname.name = (void *)h + sizeof(*h) + sizeof(u32); |
3342 | dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32); | |
3343 | if (dname.len != get_unaligned_le32(h+1)) | |
3344 | goto bad; | |
3345 | ||
2f2dc053 SW |
3346 | /* lookup inode */ |
3347 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
3348 | dout("handle_lease %s, ino %llx %p %.*s\n", |
3349 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 3350 | dname.len, dname.name); |
6cd3bcad YZ |
3351 | |
3352 | mutex_lock(&session->s_mutex); | |
3353 | session->s_seq++; | |
3354 | ||
d37b1d99 | 3355 | if (!inode) { |
2f2dc053 SW |
3356 | dout("handle_lease no inode %llx\n", vino.ino); |
3357 | goto release; | |
3358 | } | |
2f2dc053 SW |
3359 | |
3360 | /* dentry */ | |
3361 | parent = d_find_alias(inode); | |
3362 | if (!parent) { | |
3363 | dout("no parent dentry on inode %p\n", inode); | |
3364 | WARN_ON(1); | |
3365 | goto release; /* hrm... */ | |
3366 | } | |
8387ff25 | 3367 | dname.hash = full_name_hash(parent, dname.name, dname.len); |
2f2dc053 SW |
3368 | dentry = d_lookup(parent, &dname); |
3369 | dput(parent); | |
3370 | if (!dentry) | |
3371 | goto release; | |
3372 | ||
3373 | spin_lock(&dentry->d_lock); | |
3374 | di = ceph_dentry(dentry); | |
3375 | switch (h->action) { | |
3376 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 3377 | if (di->lease_session == session) { |
1e5ea23d SW |
3378 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
3379 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
3380 | __ceph_mdsc_drop_dentry_lease(dentry); |
3381 | } | |
3382 | release = 1; | |
3383 | break; | |
3384 | ||
3385 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 3386 | if (di->lease_session == session && |
2f2dc053 SW |
3387 | di->lease_gen == session->s_cap_gen && |
3388 | di->lease_renew_from && | |
3389 | di->lease_renew_after == 0) { | |
3390 | unsigned long duration = | |
3563dbdd | 3391 | msecs_to_jiffies(le32_to_cpu(h->duration_ms)); |
2f2dc053 | 3392 | |
1e5ea23d | 3393 | di->lease_seq = seq; |
9b16f03c | 3394 | di->time = di->lease_renew_from + duration; |
2f2dc053 SW |
3395 | di->lease_renew_after = di->lease_renew_from + |
3396 | (duration >> 1); | |
3397 | di->lease_renew_from = 0; | |
3398 | } | |
3399 | break; | |
3400 | } | |
3401 | spin_unlock(&dentry->d_lock); | |
3402 | dput(dentry); | |
3403 | ||
3404 | if (!release) | |
3405 | goto out; | |
3406 | ||
3407 | release: | |
3408 | /* let's just reuse the same message */ | |
3409 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
3410 | ceph_msg_get(msg); | |
3411 | ceph_con_send(&session->s_con, msg); | |
3412 | ||
3413 | out: | |
3414 | iput(inode); | |
3415 | mutex_unlock(&session->s_mutex); | |
2f2dc053 SW |
3416 | return; |
3417 | ||
3418 | bad: | |
3419 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 3420 | ceph_msg_dump(msg); |
2f2dc053 SW |
3421 | } |
3422 | ||
3423 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
3424 | struct inode *inode, | |
3425 | struct dentry *dentry, char action, | |
3426 | u32 seq) | |
3427 | { | |
3428 | struct ceph_msg *msg; | |
3429 | struct ceph_mds_lease *lease; | |
3430 | int len = sizeof(*lease) + sizeof(u32); | |
3431 | int dnamelen = 0; | |
3432 | ||
3433 | dout("lease_send_msg inode %p dentry %p %s to mds%d\n", | |
3434 | inode, dentry, ceph_lease_op_name(action), session->s_mds); | |
3435 | dnamelen = dentry->d_name.len; | |
3436 | len += dnamelen; | |
3437 | ||
b61c2763 | 3438 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 3439 | if (!msg) |
2f2dc053 SW |
3440 | return; |
3441 | lease = msg->front.iov_base; | |
3442 | lease->action = action; | |
2f2dc053 SW |
3443 | lease->ino = cpu_to_le64(ceph_vino(inode).ino); |
3444 | lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap); | |
3445 | lease->seq = cpu_to_le32(seq); | |
3446 | put_unaligned_le32(dnamelen, lease + 1); | |
3447 | memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen); | |
3448 | ||
3449 | /* | |
3450 | * if this is a preemptive lease RELEASE, no need to | |
3451 | * flush request stream, since the actual request will | |
3452 | * soon follow. | |
3453 | */ | |
3454 | msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE); | |
3455 | ||
3456 | ceph_con_send(&session->s_con, msg); | |
3457 | } | |
3458 | ||
2f2dc053 SW |
3459 | /* |
3460 | * drop all leases (and dentry refs) in preparation for umount | |
3461 | */ | |
3462 | static void drop_leases(struct ceph_mds_client *mdsc) | |
3463 | { | |
3464 | int i; | |
3465 | ||
3466 | dout("drop_leases\n"); | |
3467 | mutex_lock(&mdsc->mutex); | |
3468 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3469 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
3470 | if (!s) | |
3471 | continue; | |
3472 | mutex_unlock(&mdsc->mutex); | |
3473 | mutex_lock(&s->s_mutex); | |
3474 | mutex_unlock(&s->s_mutex); | |
3475 | ceph_put_mds_session(s); | |
3476 | mutex_lock(&mdsc->mutex); | |
3477 | } | |
3478 | mutex_unlock(&mdsc->mutex); | |
3479 | } | |
3480 | ||
3481 | ||
3482 | ||
3483 | /* | |
3484 | * delayed work -- periodically trim expired leases, renew caps with mds | |
3485 | */ | |
3486 | static void schedule_delayed(struct ceph_mds_client *mdsc) | |
3487 | { | |
3488 | int delay = 5; | |
3489 | unsigned hz = round_jiffies_relative(HZ * delay); | |
3490 | schedule_delayed_work(&mdsc->delayed_work, hz); | |
3491 | } | |
3492 | ||
3493 | static void delayed_work(struct work_struct *work) | |
3494 | { | |
3495 | int i; | |
3496 | struct ceph_mds_client *mdsc = | |
3497 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
3498 | int renew_interval; | |
3499 | int renew_caps; | |
3500 | ||
3501 | dout("mdsc delayed_work\n"); | |
afcdaea3 | 3502 | ceph_check_delayed_caps(mdsc); |
2f2dc053 SW |
3503 | |
3504 | mutex_lock(&mdsc->mutex); | |
3505 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
3506 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
3507 | mdsc->last_renew_caps); | |
3508 | if (renew_caps) | |
3509 | mdsc->last_renew_caps = jiffies; | |
3510 | ||
3511 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3512 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
d37b1d99 | 3513 | if (!s) |
2f2dc053 SW |
3514 | continue; |
3515 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3516 | dout("resending session close request for mds%d\n", | |
3517 | s->s_mds); | |
3518 | request_close_session(mdsc, s); | |
3519 | ceph_put_mds_session(s); | |
3520 | continue; | |
3521 | } | |
3522 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3523 | if (s->s_state == CEPH_MDS_SESSION_OPEN) { | |
3524 | s->s_state = CEPH_MDS_SESSION_HUNG; | |
3525 | pr_info("mds%d hung\n", s->s_mds); | |
3526 | } | |
3527 | } | |
3528 | if (s->s_state < CEPH_MDS_SESSION_OPEN) { | |
3529 | /* this mds is failed or recovering, just wait */ | |
3530 | ceph_put_mds_session(s); | |
3531 | continue; | |
3532 | } | |
3533 | mutex_unlock(&mdsc->mutex); | |
3534 | ||
3535 | mutex_lock(&s->s_mutex); | |
3536 | if (renew_caps) | |
3537 | send_renew_caps(mdsc, s); | |
3538 | else | |
3539 | ceph_con_keepalive(&s->s_con); | |
aab53dd9 SW |
3540 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
3541 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 3542 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
3543 | mutex_unlock(&s->s_mutex); |
3544 | ceph_put_mds_session(s); | |
3545 | ||
3546 | mutex_lock(&mdsc->mutex); | |
3547 | } | |
3548 | mutex_unlock(&mdsc->mutex); | |
3549 | ||
3550 | schedule_delayed(mdsc); | |
3551 | } | |
3552 | ||
3d14c5d2 | 3553 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 3554 | |
2f2dc053 | 3555 | { |
3d14c5d2 YS |
3556 | struct ceph_mds_client *mdsc; |
3557 | ||
3558 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
3559 | if (!mdsc) | |
3560 | return -ENOMEM; | |
3561 | mdsc->fsc = fsc; | |
3562 | fsc->mdsc = mdsc; | |
2f2dc053 SW |
3563 | mutex_init(&mdsc->mutex); |
3564 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
d37b1d99 | 3565 | if (!mdsc->mdsmap) { |
fb3101b6 | 3566 | kfree(mdsc); |
2d06eeb8 | 3567 | return -ENOMEM; |
fb3101b6 | 3568 | } |
2d06eeb8 | 3569 | |
2f2dc053 | 3570 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 3571 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 SW |
3572 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
3573 | mdsc->sessions = NULL; | |
86d8f67b | 3574 | atomic_set(&mdsc->num_sessions, 0); |
2f2dc053 SW |
3575 | mdsc->max_sessions = 0; |
3576 | mdsc->stopping = 0; | |
affbc19a | 3577 | mdsc->last_snap_seq = 0; |
2f2dc053 | 3578 | init_rwsem(&mdsc->snap_rwsem); |
a105f00c | 3579 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
3580 | INIT_LIST_HEAD(&mdsc->snap_empty); |
3581 | spin_lock_init(&mdsc->snap_empty_lock); | |
3582 | mdsc->last_tid = 0; | |
e8a7b8b1 | 3583 | mdsc->oldest_tid = 0; |
44ca18f2 | 3584 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
3585 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
3586 | mdsc->last_renew_caps = jiffies; | |
3587 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3588 | spin_lock_init(&mdsc->cap_delay_lock); | |
3589 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
3590 | spin_lock_init(&mdsc->snap_flush_lock); | |
553adfd9 | 3591 | mdsc->last_cap_flush_tid = 1; |
e4500b5e | 3592 | INIT_LIST_HEAD(&mdsc->cap_flush_list); |
2f2dc053 | 3593 | INIT_LIST_HEAD(&mdsc->cap_dirty); |
db354052 | 3594 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
3595 | mdsc->num_cap_flushing = 0; |
3596 | spin_lock_init(&mdsc->cap_dirty_lock); | |
3597 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
3598 | spin_lock_init(&mdsc->dentry_lru_lock); | |
3599 | INIT_LIST_HEAD(&mdsc->dentry_lru); | |
2d06eeb8 | 3600 | |
37151668 | 3601 | ceph_caps_init(mdsc); |
3d14c5d2 | 3602 | ceph_adjust_min_caps(mdsc, fsc->min_caps); |
37151668 | 3603 | |
10183a69 YZ |
3604 | init_rwsem(&mdsc->pool_perm_rwsem); |
3605 | mdsc->pool_perm_tree = RB_ROOT; | |
3606 | ||
717e6f28 YZ |
3607 | strncpy(mdsc->nodename, utsname()->nodename, |
3608 | sizeof(mdsc->nodename) - 1); | |
5f44f142 | 3609 | return 0; |
2f2dc053 SW |
3610 | } |
3611 | ||
3612 | /* | |
3613 | * Wait for safe replies on open mds requests. If we time out, drop | |
3614 | * all requests from the tree to avoid dangling dentry refs. | |
3615 | */ | |
3616 | static void wait_requests(struct ceph_mds_client *mdsc) | |
3617 | { | |
a319bf56 | 3618 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 | 3619 | struct ceph_mds_request *req; |
2f2dc053 SW |
3620 | |
3621 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3622 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 3623 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 3624 | |
2f2dc053 SW |
3625 | dout("wait_requests waiting for requests\n"); |
3626 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
a319bf56 | 3627 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
3628 | |
3629 | /* tear down remaining requests */ | |
44ca18f2 SW |
3630 | mutex_lock(&mdsc->mutex); |
3631 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
3632 | dout("wait_requests timed out on tid %llu\n", |
3633 | req->r_tid); | |
44ca18f2 | 3634 | __unregister_request(mdsc, req); |
2f2dc053 SW |
3635 | } |
3636 | } | |
3637 | mutex_unlock(&mdsc->mutex); | |
3638 | dout("wait_requests done\n"); | |
3639 | } | |
3640 | ||
3641 | /* | |
3642 | * called before mount is ro, and before dentries are torn down. | |
3643 | * (hmm, does this still race with new lookups?) | |
3644 | */ | |
3645 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
3646 | { | |
3647 | dout("pre_umount\n"); | |
3648 | mdsc->stopping = 1; | |
3649 | ||
3650 | drop_leases(mdsc); | |
afcdaea3 | 3651 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 3652 | wait_requests(mdsc); |
17c688c3 SW |
3653 | |
3654 | /* | |
3655 | * wait for reply handlers to drop their request refs and | |
3656 | * their inode/dcache refs | |
3657 | */ | |
3658 | ceph_msgr_flush(); | |
2f2dc053 SW |
3659 | } |
3660 | ||
3661 | /* | |
3662 | * wait for all write mds requests to flush. | |
3663 | */ | |
3664 | static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid) | |
3665 | { | |
80fc7314 | 3666 | struct ceph_mds_request *req = NULL, *nextreq; |
44ca18f2 | 3667 | struct rb_node *n; |
2f2dc053 SW |
3668 | |
3669 | mutex_lock(&mdsc->mutex); | |
3670 | dout("wait_unsafe_requests want %lld\n", want_tid); | |
80fc7314 | 3671 | restart: |
44ca18f2 SW |
3672 | req = __get_oldest_req(mdsc); |
3673 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
3674 | /* find next request */ |
3675 | n = rb_next(&req->r_node); | |
3676 | if (n) | |
3677 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
3678 | else | |
3679 | nextreq = NULL; | |
e8a7b8b1 YZ |
3680 | if (req->r_op != CEPH_MDS_OP_SETFILELOCK && |
3681 | (req->r_op & CEPH_MDS_OP_WRITE)) { | |
44ca18f2 SW |
3682 | /* write op */ |
3683 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
3684 | if (nextreq) |
3685 | ceph_mdsc_get_request(nextreq); | |
44ca18f2 SW |
3686 | mutex_unlock(&mdsc->mutex); |
3687 | dout("wait_unsafe_requests wait on %llu (want %llu)\n", | |
3688 | req->r_tid, want_tid); | |
3689 | wait_for_completion(&req->r_safe_completion); | |
3690 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 3691 | ceph_mdsc_put_request(req); |
80fc7314 SW |
3692 | if (!nextreq) |
3693 | break; /* next dne before, so we're done! */ | |
3694 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
3695 | /* next request was removed from tree */ | |
3696 | ceph_mdsc_put_request(nextreq); | |
3697 | goto restart; | |
3698 | } | |
3699 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 3700 | } |
80fc7314 | 3701 | req = nextreq; |
2f2dc053 SW |
3702 | } |
3703 | mutex_unlock(&mdsc->mutex); | |
3704 | dout("wait_unsafe_requests done\n"); | |
3705 | } | |
3706 | ||
3707 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
3708 | { | |
0e294387 | 3709 | u64 want_tid, want_flush; |
2f2dc053 | 3710 | |
52953d55 | 3711 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
3712 | return; |
3713 | ||
2f2dc053 SW |
3714 | dout("sync\n"); |
3715 | mutex_lock(&mdsc->mutex); | |
3716 | want_tid = mdsc->last_tid; | |
2f2dc053 | 3717 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 3718 | |
afcdaea3 | 3719 | ceph_flush_dirty_caps(mdsc); |
d3383a8e | 3720 | spin_lock(&mdsc->cap_dirty_lock); |
8310b089 | 3721 | want_flush = mdsc->last_cap_flush_tid; |
c8799fc4 YZ |
3722 | if (!list_empty(&mdsc->cap_flush_list)) { |
3723 | struct ceph_cap_flush *cf = | |
3724 | list_last_entry(&mdsc->cap_flush_list, | |
3725 | struct ceph_cap_flush, g_list); | |
3726 | cf->wake = true; | |
3727 | } | |
d3383a8e YZ |
3728 | spin_unlock(&mdsc->cap_dirty_lock); |
3729 | ||
0e294387 YZ |
3730 | dout("sync want tid %lld flush_seq %lld\n", |
3731 | want_tid, want_flush); | |
2f2dc053 SW |
3732 | |
3733 | wait_unsafe_requests(mdsc, want_tid); | |
0e294387 | 3734 | wait_caps_flush(mdsc, want_flush); |
2f2dc053 SW |
3735 | } |
3736 | ||
f3c60c59 SW |
3737 | /* |
3738 | * true if all sessions are closed, or we force unmount | |
3739 | */ | |
fcff415c | 3740 | static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped) |
f3c60c59 | 3741 | { |
52953d55 | 3742 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 | 3743 | return true; |
fcff415c | 3744 | return atomic_read(&mdsc->num_sessions) <= skipped; |
f3c60c59 | 3745 | } |
2f2dc053 SW |
3746 | |
3747 | /* | |
3748 | * called after sb is ro. | |
3749 | */ | |
3750 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
3751 | { | |
a319bf56 | 3752 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 SW |
3753 | struct ceph_mds_session *session; |
3754 | int i; | |
fcff415c | 3755 | int skipped = 0; |
2f2dc053 SW |
3756 | |
3757 | dout("close_sessions\n"); | |
3758 | ||
2f2dc053 | 3759 | /* close sessions */ |
f3c60c59 SW |
3760 | mutex_lock(&mdsc->mutex); |
3761 | for (i = 0; i < mdsc->max_sessions; i++) { | |
3762 | session = __ceph_lookup_mds_session(mdsc, i); | |
3763 | if (!session) | |
3764 | continue; | |
2f2dc053 | 3765 | mutex_unlock(&mdsc->mutex); |
f3c60c59 | 3766 | mutex_lock(&session->s_mutex); |
fcff415c YZ |
3767 | if (__close_session(mdsc, session) <= 0) |
3768 | skipped++; | |
f3c60c59 SW |
3769 | mutex_unlock(&session->s_mutex); |
3770 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3771 | mutex_lock(&mdsc->mutex); |
3772 | } | |
f3c60c59 SW |
3773 | mutex_unlock(&mdsc->mutex); |
3774 | ||
3775 | dout("waiting for sessions to close\n"); | |
fcff415c YZ |
3776 | wait_event_timeout(mdsc->session_close_wq, |
3777 | done_closing_sessions(mdsc, skipped), | |
a319bf56 | 3778 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
3779 | |
3780 | /* tear down remaining sessions */ | |
f3c60c59 | 3781 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
3782 | for (i = 0; i < mdsc->max_sessions; i++) { |
3783 | if (mdsc->sessions[i]) { | |
3784 | session = get_session(mdsc->sessions[i]); | |
2600d2dd | 3785 | __unregister_session(mdsc, session); |
2f2dc053 SW |
3786 | mutex_unlock(&mdsc->mutex); |
3787 | mutex_lock(&session->s_mutex); | |
3788 | remove_session_caps(session); | |
3789 | mutex_unlock(&session->s_mutex); | |
3790 | ceph_put_mds_session(session); | |
3791 | mutex_lock(&mdsc->mutex); | |
3792 | } | |
3793 | } | |
2f2dc053 | 3794 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
3795 | mutex_unlock(&mdsc->mutex); |
3796 | ||
3797 | ceph_cleanup_empty_realms(mdsc); | |
3798 | ||
3799 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3800 | ||
3801 | dout("stopped\n"); | |
3802 | } | |
3803 | ||
48fec5d0 YZ |
3804 | void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) |
3805 | { | |
3806 | struct ceph_mds_session *session; | |
3807 | int mds; | |
3808 | ||
3809 | dout("force umount\n"); | |
3810 | ||
3811 | mutex_lock(&mdsc->mutex); | |
3812 | for (mds = 0; mds < mdsc->max_sessions; mds++) { | |
3813 | session = __ceph_lookup_mds_session(mdsc, mds); | |
3814 | if (!session) | |
3815 | continue; | |
3816 | mutex_unlock(&mdsc->mutex); | |
3817 | mutex_lock(&session->s_mutex); | |
3818 | __close_session(mdsc, session); | |
3819 | if (session->s_state == CEPH_MDS_SESSION_CLOSING) { | |
3820 | cleanup_session_requests(mdsc, session); | |
3821 | remove_session_caps(session); | |
3822 | } | |
3823 | mutex_unlock(&session->s_mutex); | |
3824 | ceph_put_mds_session(session); | |
3825 | mutex_lock(&mdsc->mutex); | |
3826 | kick_requests(mdsc, mds); | |
3827 | } | |
3828 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
3829 | mutex_unlock(&mdsc->mutex); | |
3830 | } | |
3831 | ||
3d14c5d2 | 3832 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
3833 | { |
3834 | dout("stop\n"); | |
3835 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ | |
3836 | if (mdsc->mdsmap) | |
3837 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
3838 | kfree(mdsc->sessions); | |
37151668 | 3839 | ceph_caps_finalize(mdsc); |
10183a69 | 3840 | ceph_pool_perm_destroy(mdsc); |
2f2dc053 SW |
3841 | } |
3842 | ||
3d14c5d2 YS |
3843 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
3844 | { | |
3845 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
ef550f6f | 3846 | dout("mdsc_destroy %p\n", mdsc); |
ef550f6f SW |
3847 | |
3848 | /* flush out any connection work with references to us */ | |
3849 | ceph_msgr_flush(); | |
3850 | ||
62a65f36 YZ |
3851 | ceph_mdsc_stop(mdsc); |
3852 | ||
3d14c5d2 YS |
3853 | fsc->mdsc = NULL; |
3854 | kfree(mdsc); | |
ef550f6f | 3855 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
3856 | } |
3857 | ||
430afbad YZ |
3858 | void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
3859 | { | |
3860 | struct ceph_fs_client *fsc = mdsc->fsc; | |
3861 | const char *mds_namespace = fsc->mount_options->mds_namespace; | |
3862 | void *p = msg->front.iov_base; | |
3863 | void *end = p + msg->front.iov_len; | |
3864 | u32 epoch; | |
3865 | u32 map_len; | |
3866 | u32 num_fs; | |
3867 | u32 mount_fscid = (u32)-1; | |
3868 | u8 struct_v, struct_cv; | |
3869 | int err = -EINVAL; | |
3870 | ||
3871 | ceph_decode_need(&p, end, sizeof(u32), bad); | |
3872 | epoch = ceph_decode_32(&p); | |
3873 | ||
3874 | dout("handle_fsmap epoch %u\n", epoch); | |
3875 | ||
3876 | ceph_decode_need(&p, end, 2 + sizeof(u32), bad); | |
3877 | struct_v = ceph_decode_8(&p); | |
3878 | struct_cv = ceph_decode_8(&p); | |
3879 | map_len = ceph_decode_32(&p); | |
3880 | ||
3881 | ceph_decode_need(&p, end, sizeof(u32) * 3, bad); | |
3882 | p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */ | |
3883 | ||
3884 | num_fs = ceph_decode_32(&p); | |
3885 | while (num_fs-- > 0) { | |
3886 | void *info_p, *info_end; | |
3887 | u32 info_len; | |
3888 | u8 info_v, info_cv; | |
3889 | u32 fscid, namelen; | |
3890 | ||
3891 | ceph_decode_need(&p, end, 2 + sizeof(u32), bad); | |
3892 | info_v = ceph_decode_8(&p); | |
3893 | info_cv = ceph_decode_8(&p); | |
3894 | info_len = ceph_decode_32(&p); | |
3895 | ceph_decode_need(&p, end, info_len, bad); | |
3896 | info_p = p; | |
3897 | info_end = p + info_len; | |
3898 | p = info_end; | |
3899 | ||
3900 | ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad); | |
3901 | fscid = ceph_decode_32(&info_p); | |
3902 | namelen = ceph_decode_32(&info_p); | |
3903 | ceph_decode_need(&info_p, info_end, namelen, bad); | |
3904 | ||
3905 | if (mds_namespace && | |
3906 | strlen(mds_namespace) == namelen && | |
3907 | !strncmp(mds_namespace, (char *)info_p, namelen)) { | |
3908 | mount_fscid = fscid; | |
3909 | break; | |
3910 | } | |
3911 | } | |
3912 | ||
3913 | ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch); | |
3914 | if (mount_fscid != (u32)-1) { | |
3915 | fsc->client->monc.fs_cluster_id = mount_fscid; | |
3916 | ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, | |
3917 | 0, true); | |
3918 | ceph_monc_renew_subs(&fsc->client->monc); | |
3919 | } else { | |
3920 | err = -ENOENT; | |
3921 | goto err_out; | |
3922 | } | |
3923 | return; | |
76bd6ec4 | 3924 | |
430afbad YZ |
3925 | bad: |
3926 | pr_err("error decoding fsmap\n"); | |
3927 | err_out: | |
3928 | mutex_lock(&mdsc->mutex); | |
76bd6ec4 | 3929 | mdsc->mdsmap_err = err; |
430afbad YZ |
3930 | __wake_requests(mdsc, &mdsc->waiting_for_map); |
3931 | mutex_unlock(&mdsc->mutex); | |
430afbad | 3932 | } |
2f2dc053 SW |
3933 | |
3934 | /* | |
3935 | * handle mds map update. | |
3936 | */ | |
430afbad | 3937 | void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
2f2dc053 SW |
3938 | { |
3939 | u32 epoch; | |
3940 | u32 maplen; | |
3941 | void *p = msg->front.iov_base; | |
3942 | void *end = p + msg->front.iov_len; | |
3943 | struct ceph_mdsmap *newmap, *oldmap; | |
3944 | struct ceph_fsid fsid; | |
3945 | int err = -EINVAL; | |
3946 | ||
3947 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
3948 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 3949 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 3950 | return; |
c89136ea SW |
3951 | epoch = ceph_decode_32(&p); |
3952 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
3953 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
3954 | ||
3955 | /* do we need it? */ | |
2f2dc053 SW |
3956 | mutex_lock(&mdsc->mutex); |
3957 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
3958 | dout("handle_map epoch %u <= our %u\n", | |
3959 | epoch, mdsc->mdsmap->m_epoch); | |
3960 | mutex_unlock(&mdsc->mutex); | |
3961 | return; | |
3962 | } | |
3963 | ||
3964 | newmap = ceph_mdsmap_decode(&p, end); | |
3965 | if (IS_ERR(newmap)) { | |
3966 | err = PTR_ERR(newmap); | |
3967 | goto bad_unlock; | |
3968 | } | |
3969 | ||
3970 | /* swap into place */ | |
3971 | if (mdsc->mdsmap) { | |
3972 | oldmap = mdsc->mdsmap; | |
3973 | mdsc->mdsmap = newmap; | |
3974 | check_new_map(mdsc, newmap, oldmap); | |
3975 | ceph_mdsmap_destroy(oldmap); | |
3976 | } else { | |
3977 | mdsc->mdsmap = newmap; /* first mds map */ | |
3978 | } | |
3d14c5d2 | 3979 | mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size; |
2f2dc053 SW |
3980 | |
3981 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
82dcabad ID |
3982 | ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, |
3983 | mdsc->mdsmap->m_epoch); | |
2f2dc053 SW |
3984 | |
3985 | mutex_unlock(&mdsc->mutex); | |
3986 | schedule_delayed(mdsc); | |
3987 | return; | |
3988 | ||
3989 | bad_unlock: | |
3990 | mutex_unlock(&mdsc->mutex); | |
3991 | bad: | |
3992 | pr_err("error decoding mdsmap %d\n", err); | |
3993 | return; | |
3994 | } | |
3995 | ||
3996 | static struct ceph_connection *con_get(struct ceph_connection *con) | |
3997 | { | |
3998 | struct ceph_mds_session *s = con->private; | |
3999 | ||
4000 | if (get_session(s)) { | |
3997c01d | 4001 | dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref)); |
2f2dc053 SW |
4002 | return con; |
4003 | } | |
4004 | dout("mdsc con_get %p FAIL\n", s); | |
4005 | return NULL; | |
4006 | } | |
4007 | ||
4008 | static void con_put(struct ceph_connection *con) | |
4009 | { | |
4010 | struct ceph_mds_session *s = con->private; | |
4011 | ||
3997c01d | 4012 | dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1); |
2f2dc053 SW |
4013 | ceph_put_mds_session(s); |
4014 | } | |
4015 | ||
4016 | /* | |
4017 | * if the client is unresponsive for long enough, the mds will kill | |
4018 | * the session entirely. | |
4019 | */ | |
4020 | static void peer_reset(struct ceph_connection *con) | |
4021 | { | |
4022 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 4023 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 4024 | |
f3ae1b97 | 4025 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 4026 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
4027 | } |
4028 | ||
4029 | static void dispatch(struct ceph_connection *con, struct ceph_msg *msg) | |
4030 | { | |
4031 | struct ceph_mds_session *s = con->private; | |
4032 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
4033 | int type = le16_to_cpu(msg->hdr.type); | |
4034 | ||
2600d2dd SW |
4035 | mutex_lock(&mdsc->mutex); |
4036 | if (__verify_registered_session(mdsc, s) < 0) { | |
4037 | mutex_unlock(&mdsc->mutex); | |
4038 | goto out; | |
4039 | } | |
4040 | mutex_unlock(&mdsc->mutex); | |
4041 | ||
2f2dc053 SW |
4042 | switch (type) { |
4043 | case CEPH_MSG_MDS_MAP: | |
430afbad YZ |
4044 | ceph_mdsc_handle_mdsmap(mdsc, msg); |
4045 | break; | |
4046 | case CEPH_MSG_FS_MAP_USER: | |
4047 | ceph_mdsc_handle_fsmap(mdsc, msg); | |
2f2dc053 SW |
4048 | break; |
4049 | case CEPH_MSG_CLIENT_SESSION: | |
4050 | handle_session(s, msg); | |
4051 | break; | |
4052 | case CEPH_MSG_CLIENT_REPLY: | |
4053 | handle_reply(s, msg); | |
4054 | break; | |
4055 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 4056 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
4057 | break; |
4058 | case CEPH_MSG_CLIENT_CAPS: | |
4059 | ceph_handle_caps(s, msg); | |
4060 | break; | |
4061 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 4062 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
4063 | break; |
4064 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 4065 | handle_lease(mdsc, s, msg); |
2f2dc053 SW |
4066 | break; |
4067 | ||
4068 | default: | |
4069 | pr_err("received unknown message type %d %s\n", type, | |
4070 | ceph_msg_type_name(type)); | |
4071 | } | |
2600d2dd | 4072 | out: |
2f2dc053 SW |
4073 | ceph_msg_put(msg); |
4074 | } | |
4075 | ||
4e7a5dcd SW |
4076 | /* |
4077 | * authentication | |
4078 | */ | |
a3530df3 AE |
4079 | |
4080 | /* | |
4081 | * Note: returned pointer is the address of a structure that's | |
4082 | * managed separately. Caller must *not* attempt to free it. | |
4083 | */ | |
4084 | static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con, | |
8f43fb53 | 4085 | int *proto, int force_new) |
4e7a5dcd SW |
4086 | { |
4087 | struct ceph_mds_session *s = con->private; | |
4088 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 4089 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 4090 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 4091 | |
74f1869f | 4092 | if (force_new && auth->authorizer) { |
6c1ea260 | 4093 | ceph_auth_destroy_authorizer(auth->authorizer); |
74f1869f | 4094 | auth->authorizer = NULL; |
4e7a5dcd | 4095 | } |
27859f97 SW |
4096 | if (!auth->authorizer) { |
4097 | int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
4098 | auth); | |
0bed9b5c SW |
4099 | if (ret) |
4100 | return ERR_PTR(ret); | |
27859f97 SW |
4101 | } else { |
4102 | int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS, | |
4103 | auth); | |
a255651d | 4104 | if (ret) |
a3530df3 | 4105 | return ERR_PTR(ret); |
4e7a5dcd | 4106 | } |
4e7a5dcd | 4107 | *proto = ac->protocol; |
74f1869f | 4108 | |
a3530df3 | 4109 | return auth; |
4e7a5dcd SW |
4110 | } |
4111 | ||
4112 | ||
0dde5848 | 4113 | static int verify_authorizer_reply(struct ceph_connection *con) |
4e7a5dcd SW |
4114 | { |
4115 | struct ceph_mds_session *s = con->private; | |
4116 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 4117 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
4e7a5dcd | 4118 | |
0dde5848 | 4119 | return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer); |
4e7a5dcd SW |
4120 | } |
4121 | ||
9bd2e6f8 SW |
4122 | static int invalidate_authorizer(struct ceph_connection *con) |
4123 | { | |
4124 | struct ceph_mds_session *s = con->private; | |
4125 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 4126 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 4127 | |
27859f97 | 4128 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 4129 | |
3d14c5d2 | 4130 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
4131 | } |
4132 | ||
53ded495 AE |
4133 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
4134 | struct ceph_msg_header *hdr, int *skip) | |
4135 | { | |
4136 | struct ceph_msg *msg; | |
4137 | int type = (int) le16_to_cpu(hdr->type); | |
4138 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
4139 | ||
4140 | if (con->in_msg) | |
4141 | return con->in_msg; | |
4142 | ||
4143 | *skip = 0; | |
4144 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
4145 | if (!msg) { | |
4146 | pr_err("unable to allocate msg type %d len %d\n", | |
4147 | type, front_len); | |
4148 | return NULL; | |
4149 | } | |
53ded495 AE |
4150 | |
4151 | return msg; | |
4152 | } | |
4153 | ||
79dbd1ba | 4154 | static int mds_sign_message(struct ceph_msg *msg) |
33d07337 | 4155 | { |
79dbd1ba | 4156 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 4157 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 4158 | |
33d07337 YZ |
4159 | return ceph_auth_sign_message(auth, msg); |
4160 | } | |
4161 | ||
79dbd1ba | 4162 | static int mds_check_message_signature(struct ceph_msg *msg) |
33d07337 | 4163 | { |
79dbd1ba | 4164 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 4165 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 4166 | |
33d07337 YZ |
4167 | return ceph_auth_check_message_signature(auth, msg); |
4168 | } | |
4169 | ||
9e32789f | 4170 | static const struct ceph_connection_operations mds_con_ops = { |
2f2dc053 SW |
4171 | .get = con_get, |
4172 | .put = con_put, | |
4173 | .dispatch = dispatch, | |
4e7a5dcd SW |
4174 | .get_authorizer = get_authorizer, |
4175 | .verify_authorizer_reply = verify_authorizer_reply, | |
9bd2e6f8 | 4176 | .invalidate_authorizer = invalidate_authorizer, |
2f2dc053 | 4177 | .peer_reset = peer_reset, |
53ded495 | 4178 | .alloc_msg = mds_alloc_msg, |
79dbd1ba ID |
4179 | .sign_message = mds_sign_message, |
4180 | .check_message_signature = mds_check_message_signature, | |
2f2dc053 SW |
4181 | }; |
4182 | ||
2f2dc053 | 4183 | /* eof */ |