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45 | * are no longer valid.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