Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3d14c5d2 | 2 | #include <linux/ceph/ceph_debug.h> |
2f2dc053 | 3 | |
496e5955 | 4 | #include <linux/fs.h> |
2f2dc053 | 5 | #include <linux/wait.h> |
5a0e3ad6 | 6 | #include <linux/slab.h> |
54008399 | 7 | #include <linux/gfp.h> |
2f2dc053 | 8 | #include <linux/sched.h> |
3d14c5d2 YS |
9 | #include <linux/debugfs.h> |
10 | #include <linux/seq_file.h> | |
3e0708b9 | 11 | #include <linux/ratelimit.h> |
9ba1e224 | 12 | #include <linux/bits.h> |
70c94820 | 13 | #include <linux/ktime.h> |
d517b398 | 14 | #include <linux/bitmap.h> |
2f2dc053 | 15 | |
2f2dc053 | 16 | #include "super.h" |
3d14c5d2 YS |
17 | #include "mds_client.h" |
18 | ||
1fe60e51 | 19 | #include <linux/ceph/ceph_features.h> |
3d14c5d2 YS |
20 | #include <linux/ceph/messenger.h> |
21 | #include <linux/ceph/decode.h> | |
22 | #include <linux/ceph/pagelist.h> | |
23 | #include <linux/ceph/auth.h> | |
24 | #include <linux/ceph/debugfs.h> | |
2f2dc053 | 25 | |
81c5a148 YZ |
26 | #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE) |
27 | ||
2f2dc053 SW |
28 | /* |
29 | * A cluster of MDS (metadata server) daemons is responsible for | |
30 | * managing the file system namespace (the directory hierarchy and | |
31 | * inodes) and for coordinating shared access to storage. Metadata is | |
32 | * partitioning hierarchically across a number of servers, and that | |
33 | * partition varies over time as the cluster adjusts the distribution | |
34 | * in order to balance load. | |
35 | * | |
36 | * The MDS client is primarily responsible to managing synchronous | |
37 | * metadata requests for operations like open, unlink, and so forth. | |
38 | * If there is a MDS failure, we find out about it when we (possibly | |
39 | * request and) receive a new MDS map, and can resubmit affected | |
40 | * requests. | |
41 | * | |
42 | * For the most part, though, we take advantage of a lossless | |
43 | * communications channel to the MDS, and do not need to worry about | |
44 | * timing out or resubmitting requests. | |
45 | * | |
46 | * We maintain a stateful "session" with each MDS we interact with. | |
47 | * Within each session, we sent periodic heartbeat messages to ensure | |
48 | * any capabilities or leases we have been issues remain valid. If | |
49 | * the session times out and goes stale, our leases and capabilities | |
50 | * are no longer valid. | |
51 | */ | |
52 | ||
20cb34ae | 53 | struct ceph_reconnect_state { |
81c5a148 YZ |
54 | struct ceph_mds_session *session; |
55 | int nr_caps, nr_realms; | |
20cb34ae | 56 | struct ceph_pagelist *pagelist; |
121f22a1 | 57 | unsigned msg_version; |
81c5a148 | 58 | bool allow_multi; |
20cb34ae SW |
59 | }; |
60 | ||
2f2dc053 SW |
61 | static void __wake_requests(struct ceph_mds_client *mdsc, |
62 | struct list_head *head); | |
e3ec8d68 | 63 | static void ceph_cap_release_work(struct work_struct *work); |
37c4efc1 | 64 | static void ceph_cap_reclaim_work(struct work_struct *work); |
2f2dc053 | 65 | |
9e32789f | 66 | static const struct ceph_connection_operations mds_con_ops; |
2f2dc053 SW |
67 | |
68 | ||
69 | /* | |
70 | * mds reply parsing | |
71 | */ | |
72 | ||
b37fe1f9 YZ |
73 | static int parse_reply_info_quota(void **p, void *end, |
74 | struct ceph_mds_reply_info_in *info) | |
75 | { | |
76 | u8 struct_v, struct_compat; | |
77 | u32 struct_len; | |
78 | ||
79 | ceph_decode_8_safe(p, end, struct_v, bad); | |
80 | ceph_decode_8_safe(p, end, struct_compat, bad); | |
81 | /* struct_v is expected to be >= 1. we only | |
82 | * understand encoding with struct_compat == 1. */ | |
83 | if (!struct_v || struct_compat != 1) | |
84 | goto bad; | |
85 | ceph_decode_32_safe(p, end, struct_len, bad); | |
86 | ceph_decode_need(p, end, struct_len, bad); | |
87 | end = *p + struct_len; | |
88 | ceph_decode_64_safe(p, end, info->max_bytes, bad); | |
89 | ceph_decode_64_safe(p, end, info->max_files, bad); | |
90 | *p = end; | |
91 | return 0; | |
92 | bad: | |
93 | return -EIO; | |
94 | } | |
95 | ||
2f2dc053 SW |
96 | /* |
97 | * parse individual inode info | |
98 | */ | |
99 | static int parse_reply_info_in(void **p, void *end, | |
14303d20 | 100 | struct ceph_mds_reply_info_in *info, |
12b4629a | 101 | u64 features) |
2f2dc053 | 102 | { |
b37fe1f9 YZ |
103 | int err = 0; |
104 | u8 struct_v = 0; | |
2f2dc053 | 105 | |
b37fe1f9 YZ |
106 | if (features == (u64)-1) { |
107 | u32 struct_len; | |
108 | u8 struct_compat; | |
109 | ceph_decode_8_safe(p, end, struct_v, bad); | |
110 | ceph_decode_8_safe(p, end, struct_compat, bad); | |
111 | /* struct_v is expected to be >= 1. we only understand | |
112 | * encoding with struct_compat == 1. */ | |
113 | if (!struct_v || struct_compat != 1) | |
114 | goto bad; | |
115 | ceph_decode_32_safe(p, end, struct_len, bad); | |
116 | ceph_decode_need(p, end, struct_len, bad); | |
117 | end = *p + struct_len; | |
118 | } | |
119 | ||
120 | ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad); | |
2f2dc053 SW |
121 | info->in = *p; |
122 | *p += sizeof(struct ceph_mds_reply_inode) + | |
123 | sizeof(*info->in->fragtree.splits) * | |
124 | le32_to_cpu(info->in->fragtree.nsplits); | |
125 | ||
126 | ceph_decode_32_safe(p, end, info->symlink_len, bad); | |
127 | ceph_decode_need(p, end, info->symlink_len, bad); | |
128 | info->symlink = *p; | |
129 | *p += info->symlink_len; | |
130 | ||
23c625ce ID |
131 | ceph_decode_copy_safe(p, end, &info->dir_layout, |
132 | sizeof(info->dir_layout), bad); | |
2f2dc053 SW |
133 | ceph_decode_32_safe(p, end, info->xattr_len, bad); |
134 | ceph_decode_need(p, end, info->xattr_len, bad); | |
135 | info->xattr_data = *p; | |
136 | *p += info->xattr_len; | |
fb01d1f8 | 137 | |
b37fe1f9 YZ |
138 | if (features == (u64)-1) { |
139 | /* inline data */ | |
fb01d1f8 YZ |
140 | ceph_decode_64_safe(p, end, info->inline_version, bad); |
141 | ceph_decode_32_safe(p, end, info->inline_len, bad); | |
142 | ceph_decode_need(p, end, info->inline_len, bad); | |
143 | info->inline_data = *p; | |
144 | *p += info->inline_len; | |
b37fe1f9 YZ |
145 | /* quota */ |
146 | err = parse_reply_info_quota(p, end, info); | |
147 | if (err < 0) | |
148 | goto out_bad; | |
149 | /* pool namespace */ | |
150 | ceph_decode_32_safe(p, end, info->pool_ns_len, bad); | |
151 | if (info->pool_ns_len > 0) { | |
152 | ceph_decode_need(p, end, info->pool_ns_len, bad); | |
153 | info->pool_ns_data = *p; | |
154 | *p += info->pool_ns_len; | |
155 | } | |
245ce991 JL |
156 | |
157 | /* btime */ | |
158 | ceph_decode_need(p, end, sizeof(info->btime), bad); | |
159 | ceph_decode_copy(p, &info->btime, sizeof(info->btime)); | |
160 | ||
161 | /* change attribute */ | |
a35ead31 | 162 | ceph_decode_64_safe(p, end, info->change_attr, bad); |
fb01d1f8 | 163 | |
08796873 YZ |
164 | /* dir pin */ |
165 | if (struct_v >= 2) { | |
166 | ceph_decode_32_safe(p, end, info->dir_pin, bad); | |
167 | } else { | |
168 | info->dir_pin = -ENODATA; | |
169 | } | |
170 | ||
193e7b37 DD |
171 | /* snapshot birth time, remains zero for v<=2 */ |
172 | if (struct_v >= 3) { | |
173 | ceph_decode_need(p, end, sizeof(info->snap_btime), bad); | |
174 | ceph_decode_copy(p, &info->snap_btime, | |
175 | sizeof(info->snap_btime)); | |
176 | } else { | |
177 | memset(&info->snap_btime, 0, sizeof(info->snap_btime)); | |
178 | } | |
179 | ||
e7f72952 YC |
180 | /* snapshot count, remains zero for v<=3 */ |
181 | if (struct_v >= 4) { | |
182 | ceph_decode_64_safe(p, end, info->rsnaps, bad); | |
183 | } else { | |
184 | info->rsnaps = 0; | |
185 | } | |
186 | ||
b37fe1f9 YZ |
187 | *p = end; |
188 | } else { | |
189 | if (features & CEPH_FEATURE_MDS_INLINE_DATA) { | |
190 | ceph_decode_64_safe(p, end, info->inline_version, bad); | |
191 | ceph_decode_32_safe(p, end, info->inline_len, bad); | |
192 | ceph_decode_need(p, end, info->inline_len, bad); | |
193 | info->inline_data = *p; | |
194 | *p += info->inline_len; | |
195 | } else | |
196 | info->inline_version = CEPH_INLINE_NONE; | |
197 | ||
198 | if (features & CEPH_FEATURE_MDS_QUOTA) { | |
199 | err = parse_reply_info_quota(p, end, info); | |
200 | if (err < 0) | |
201 | goto out_bad; | |
202 | } else { | |
203 | info->max_bytes = 0; | |
204 | info->max_files = 0; | |
205 | } | |
206 | ||
207 | info->pool_ns_len = 0; | |
208 | info->pool_ns_data = NULL; | |
209 | if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) { | |
210 | ceph_decode_32_safe(p, end, info->pool_ns_len, bad); | |
211 | if (info->pool_ns_len > 0) { | |
212 | ceph_decode_need(p, end, info->pool_ns_len, bad); | |
213 | info->pool_ns_data = *p; | |
214 | *p += info->pool_ns_len; | |
215 | } | |
216 | } | |
08796873 | 217 | |
245ce991 JL |
218 | if (features & CEPH_FEATURE_FS_BTIME) { |
219 | ceph_decode_need(p, end, sizeof(info->btime), bad); | |
220 | ceph_decode_copy(p, &info->btime, sizeof(info->btime)); | |
a35ead31 | 221 | ceph_decode_64_safe(p, end, info->change_attr, bad); |
245ce991 JL |
222 | } |
223 | ||
08796873 | 224 | info->dir_pin = -ENODATA; |
e7f72952 | 225 | /* info->snap_btime and info->rsnaps remain zero */ |
b37fe1f9 YZ |
226 | } |
227 | return 0; | |
228 | bad: | |
229 | err = -EIO; | |
230 | out_bad: | |
231 | return err; | |
232 | } | |
233 | ||
234 | static int parse_reply_info_dir(void **p, void *end, | |
235 | struct ceph_mds_reply_dirfrag **dirfrag, | |
236 | u64 features) | |
237 | { | |
238 | if (features == (u64)-1) { | |
fb18a575 LH |
239 | u8 struct_v, struct_compat; |
240 | u32 struct_len; | |
fb18a575 LH |
241 | ceph_decode_8_safe(p, end, struct_v, bad); |
242 | ceph_decode_8_safe(p, end, struct_compat, bad); | |
b37fe1f9 YZ |
243 | /* struct_v is expected to be >= 1. we only understand |
244 | * encoding whose struct_compat == 1. */ | |
245 | if (!struct_v || struct_compat != 1) | |
fb18a575 LH |
246 | goto bad; |
247 | ceph_decode_32_safe(p, end, struct_len, bad); | |
248 | ceph_decode_need(p, end, struct_len, bad); | |
b37fe1f9 | 249 | end = *p + struct_len; |
fb18a575 LH |
250 | } |
251 | ||
b37fe1f9 YZ |
252 | ceph_decode_need(p, end, sizeof(**dirfrag), bad); |
253 | *dirfrag = *p; | |
254 | *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist); | |
255 | if (unlikely(*p > end)) | |
256 | goto bad; | |
257 | if (features == (u64)-1) | |
258 | *p = end; | |
259 | return 0; | |
260 | bad: | |
261 | return -EIO; | |
262 | } | |
263 | ||
264 | static int parse_reply_info_lease(void **p, void *end, | |
265 | struct ceph_mds_reply_lease **lease, | |
266 | u64 features) | |
267 | { | |
268 | if (features == (u64)-1) { | |
269 | u8 struct_v, struct_compat; | |
270 | u32 struct_len; | |
271 | ceph_decode_8_safe(p, end, struct_v, bad); | |
272 | ceph_decode_8_safe(p, end, struct_compat, bad); | |
273 | /* struct_v is expected to be >= 1. we only understand | |
274 | * encoding whose struct_compat == 1. */ | |
275 | if (!struct_v || struct_compat != 1) | |
276 | goto bad; | |
277 | ceph_decode_32_safe(p, end, struct_len, bad); | |
278 | ceph_decode_need(p, end, struct_len, bad); | |
279 | end = *p + struct_len; | |
5ea5c5e0 YZ |
280 | } |
281 | ||
b37fe1f9 YZ |
282 | ceph_decode_need(p, end, sizeof(**lease), bad); |
283 | *lease = *p; | |
284 | *p += sizeof(**lease); | |
285 | if (features == (u64)-1) | |
286 | *p = end; | |
2f2dc053 SW |
287 | return 0; |
288 | bad: | |
b37fe1f9 | 289 | return -EIO; |
2f2dc053 SW |
290 | } |
291 | ||
292 | /* | |
293 | * parse a normal reply, which may contain a (dir+)dentry and/or a | |
294 | * target inode. | |
295 | */ | |
296 | static int parse_reply_info_trace(void **p, void *end, | |
14303d20 | 297 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 298 | u64 features) |
2f2dc053 SW |
299 | { |
300 | int err; | |
301 | ||
302 | if (info->head->is_dentry) { | |
14303d20 | 303 | err = parse_reply_info_in(p, end, &info->diri, features); |
2f2dc053 SW |
304 | if (err < 0) |
305 | goto out_bad; | |
306 | ||
b37fe1f9 YZ |
307 | err = parse_reply_info_dir(p, end, &info->dirfrag, features); |
308 | if (err < 0) | |
309 | goto out_bad; | |
2f2dc053 SW |
310 | |
311 | ceph_decode_32_safe(p, end, info->dname_len, bad); | |
312 | ceph_decode_need(p, end, info->dname_len, bad); | |
313 | info->dname = *p; | |
314 | *p += info->dname_len; | |
b37fe1f9 YZ |
315 | |
316 | err = parse_reply_info_lease(p, end, &info->dlease, features); | |
317 | if (err < 0) | |
318 | goto out_bad; | |
2f2dc053 SW |
319 | } |
320 | ||
321 | if (info->head->is_target) { | |
14303d20 | 322 | err = parse_reply_info_in(p, end, &info->targeti, features); |
2f2dc053 SW |
323 | if (err < 0) |
324 | goto out_bad; | |
325 | } | |
326 | ||
327 | if (unlikely(*p != end)) | |
328 | goto bad; | |
329 | return 0; | |
330 | ||
331 | bad: | |
332 | err = -EIO; | |
333 | out_bad: | |
334 | pr_err("problem parsing mds trace %d\n", err); | |
335 | return err; | |
336 | } | |
337 | ||
338 | /* | |
339 | * parse readdir results | |
340 | */ | |
b37fe1f9 | 341 | static int parse_reply_info_readdir(void **p, void *end, |
14303d20 | 342 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 343 | u64 features) |
2f2dc053 SW |
344 | { |
345 | u32 num, i = 0; | |
346 | int err; | |
347 | ||
b37fe1f9 YZ |
348 | err = parse_reply_info_dir(p, end, &info->dir_dir, features); |
349 | if (err < 0) | |
350 | goto out_bad; | |
2f2dc053 SW |
351 | |
352 | ceph_decode_need(p, end, sizeof(num) + 2, bad); | |
c89136ea | 353 | num = ceph_decode_32(p); |
956d39d6 YZ |
354 | { |
355 | u16 flags = ceph_decode_16(p); | |
356 | info->dir_end = !!(flags & CEPH_READDIR_FRAG_END); | |
357 | info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE); | |
f3c4ebe6 | 358 | info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER); |
79162547 | 359 | info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH); |
956d39d6 | 360 | } |
2f2dc053 SW |
361 | if (num == 0) |
362 | goto done; | |
363 | ||
2a5beea3 YZ |
364 | BUG_ON(!info->dir_entries); |
365 | if ((unsigned long)(info->dir_entries + num) > | |
366 | (unsigned long)info->dir_entries + info->dir_buf_size) { | |
54008399 YZ |
367 | pr_err("dir contents are larger than expected\n"); |
368 | WARN_ON(1); | |
369 | goto bad; | |
370 | } | |
2f2dc053 | 371 | |
54008399 | 372 | info->dir_nr = num; |
2f2dc053 | 373 | while (num) { |
2a5beea3 | 374 | struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i; |
2f2dc053 | 375 | /* dentry */ |
b37fe1f9 | 376 | ceph_decode_32_safe(p, end, rde->name_len, bad); |
2a5beea3 YZ |
377 | ceph_decode_need(p, end, rde->name_len, bad); |
378 | rde->name = *p; | |
379 | *p += rde->name_len; | |
380 | dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); | |
2f2dc053 | 381 | |
b37fe1f9 YZ |
382 | /* dentry lease */ |
383 | err = parse_reply_info_lease(p, end, &rde->lease, features); | |
384 | if (err) | |
385 | goto out_bad; | |
2f2dc053 | 386 | /* inode */ |
2a5beea3 | 387 | err = parse_reply_info_in(p, end, &rde->inode, features); |
2f2dc053 SW |
388 | if (err < 0) |
389 | goto out_bad; | |
8974eebd YZ |
390 | /* ceph_readdir_prepopulate() will update it */ |
391 | rde->offset = 0; | |
2f2dc053 SW |
392 | i++; |
393 | num--; | |
394 | } | |
395 | ||
396 | done: | |
1d3f8723 JL |
397 | /* Skip over any unrecognized fields */ |
398 | *p = end; | |
2f2dc053 SW |
399 | return 0; |
400 | ||
401 | bad: | |
402 | err = -EIO; | |
403 | out_bad: | |
404 | pr_err("problem parsing dir contents %d\n", err); | |
405 | return err; | |
406 | } | |
407 | ||
25933abd HS |
408 | /* |
409 | * parse fcntl F_GETLK results | |
410 | */ | |
411 | static int parse_reply_info_filelock(void **p, void *end, | |
14303d20 | 412 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 413 | u64 features) |
25933abd HS |
414 | { |
415 | if (*p + sizeof(*info->filelock_reply) > end) | |
416 | goto bad; | |
417 | ||
418 | info->filelock_reply = *p; | |
25933abd | 419 | |
1d3f8723 JL |
420 | /* Skip over any unrecognized fields */ |
421 | *p = end; | |
25933abd | 422 | return 0; |
25933abd HS |
423 | bad: |
424 | return -EIO; | |
425 | } | |
426 | ||
d4846487 JL |
427 | |
428 | #if BITS_PER_LONG == 64 | |
429 | ||
430 | #define DELEGATED_INO_AVAILABLE xa_mk_value(1) | |
431 | ||
432 | static int ceph_parse_deleg_inos(void **p, void *end, | |
433 | struct ceph_mds_session *s) | |
434 | { | |
435 | u32 sets; | |
436 | ||
437 | ceph_decode_32_safe(p, end, sets, bad); | |
438 | dout("got %u sets of delegated inodes\n", sets); | |
439 | while (sets--) { | |
2ecd0edd | 440 | u64 start, len; |
d4846487 JL |
441 | |
442 | ceph_decode_64_safe(p, end, start, bad); | |
443 | ceph_decode_64_safe(p, end, len, bad); | |
d4f6b31d JL |
444 | |
445 | /* Don't accept a delegation of system inodes */ | |
446 | if (start < CEPH_INO_SYSTEM_BASE) { | |
447 | pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n", | |
448 | start, len); | |
449 | continue; | |
450 | } | |
d4846487 | 451 | while (len--) { |
2ecd0edd | 452 | int err = xa_insert(&s->s_delegated_inos, start++, |
d4846487 JL |
453 | DELEGATED_INO_AVAILABLE, |
454 | GFP_KERNEL); | |
455 | if (!err) { | |
456 | dout("added delegated inode 0x%llx\n", | |
457 | start - 1); | |
458 | } else if (err == -EBUSY) { | |
4868e537 | 459 | pr_warn("MDS delegated inode 0x%llx more than once.\n", |
d4846487 JL |
460 | start - 1); |
461 | } else { | |
462 | return err; | |
463 | } | |
464 | } | |
465 | } | |
466 | return 0; | |
467 | bad: | |
468 | return -EIO; | |
469 | } | |
470 | ||
471 | u64 ceph_get_deleg_ino(struct ceph_mds_session *s) | |
472 | { | |
473 | unsigned long ino; | |
474 | void *val; | |
475 | ||
476 | xa_for_each(&s->s_delegated_inos, ino, val) { | |
477 | val = xa_erase(&s->s_delegated_inos, ino); | |
478 | if (val == DELEGATED_INO_AVAILABLE) | |
479 | return ino; | |
480 | } | |
481 | return 0; | |
482 | } | |
483 | ||
484 | int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) | |
485 | { | |
486 | return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE, | |
487 | GFP_KERNEL); | |
488 | } | |
489 | #else /* BITS_PER_LONG == 64 */ | |
490 | /* | |
491 | * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just | |
492 | * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top | |
493 | * and bottom words? | |
494 | */ | |
495 | static int ceph_parse_deleg_inos(void **p, void *end, | |
496 | struct ceph_mds_session *s) | |
497 | { | |
498 | u32 sets; | |
499 | ||
500 | ceph_decode_32_safe(p, end, sets, bad); | |
501 | if (sets) | |
502 | ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad); | |
503 | return 0; | |
504 | bad: | |
505 | return -EIO; | |
506 | } | |
507 | ||
508 | u64 ceph_get_deleg_ino(struct ceph_mds_session *s) | |
509 | { | |
510 | return 0; | |
511 | } | |
512 | ||
513 | int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino) | |
514 | { | |
515 | return 0; | |
516 | } | |
517 | #endif /* BITS_PER_LONG == 64 */ | |
518 | ||
6e8575fa SL |
519 | /* |
520 | * parse create results | |
521 | */ | |
522 | static int parse_reply_info_create(void **p, void *end, | |
523 | struct ceph_mds_reply_info_parsed *info, | |
d4846487 | 524 | u64 features, struct ceph_mds_session *s) |
6e8575fa | 525 | { |
d4846487 JL |
526 | int ret; |
527 | ||
b37fe1f9 YZ |
528 | if (features == (u64)-1 || |
529 | (features & CEPH_FEATURE_REPLY_CREATE_INODE)) { | |
6e8575fa | 530 | if (*p == end) { |
d4846487 | 531 | /* Malformed reply? */ |
6e8575fa | 532 | info->has_create_ino = false; |
d4846487 | 533 | } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) { |
6e8575fa | 534 | info->has_create_ino = true; |
06a1ad43 JL |
535 | /* struct_v, struct_compat, and len */ |
536 | ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad); | |
d4846487 JL |
537 | ceph_decode_64_safe(p, end, info->ino, bad); |
538 | ret = ceph_parse_deleg_inos(p, end, s); | |
539 | if (ret) | |
540 | return ret; | |
541 | } else { | |
542 | /* legacy */ | |
1d3f8723 | 543 | ceph_decode_64_safe(p, end, info->ino, bad); |
d4846487 | 544 | info->has_create_ino = true; |
6e8575fa | 545 | } |
1d3f8723 JL |
546 | } else { |
547 | if (*p != end) | |
548 | goto bad; | |
6e8575fa SL |
549 | } |
550 | ||
1d3f8723 JL |
551 | /* Skip over any unrecognized fields */ |
552 | *p = end; | |
6e8575fa | 553 | return 0; |
6e8575fa SL |
554 | bad: |
555 | return -EIO; | |
556 | } | |
557 | ||
6ddf5f16 MC |
558 | static int parse_reply_info_getvxattr(void **p, void *end, |
559 | struct ceph_mds_reply_info_parsed *info, | |
560 | u64 features) | |
561 | { | |
562 | u32 value_len; | |
563 | ||
564 | ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */ | |
565 | ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */ | |
566 | ceph_decode_skip_32(p, end, bad); /* skip payload length */ | |
567 | ||
568 | ceph_decode_32_safe(p, end, value_len, bad); | |
569 | ||
570 | if (value_len == end - *p) { | |
571 | info->xattr_info.xattr_value = *p; | |
572 | info->xattr_info.xattr_value_len = value_len; | |
573 | *p = end; | |
574 | return value_len; | |
575 | } | |
576 | bad: | |
577 | return -EIO; | |
578 | } | |
579 | ||
25933abd HS |
580 | /* |
581 | * parse extra results | |
582 | */ | |
583 | static int parse_reply_info_extra(void **p, void *end, | |
14303d20 | 584 | struct ceph_mds_reply_info_parsed *info, |
d4846487 | 585 | u64 features, struct ceph_mds_session *s) |
25933abd | 586 | { |
6df8c9d8 JL |
587 | u32 op = le32_to_cpu(info->head->op); |
588 | ||
589 | if (op == CEPH_MDS_OP_GETFILELOCK) | |
14303d20 | 590 | return parse_reply_info_filelock(p, end, info, features); |
6df8c9d8 | 591 | else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP) |
b37fe1f9 | 592 | return parse_reply_info_readdir(p, end, info, features); |
6df8c9d8 | 593 | else if (op == CEPH_MDS_OP_CREATE) |
d4846487 | 594 | return parse_reply_info_create(p, end, info, features, s); |
6ddf5f16 MC |
595 | else if (op == CEPH_MDS_OP_GETVXATTR) |
596 | return parse_reply_info_getvxattr(p, end, info, features); | |
6e8575fa SL |
597 | else |
598 | return -EIO; | |
25933abd HS |
599 | } |
600 | ||
2f2dc053 SW |
601 | /* |
602 | * parse entire mds reply | |
603 | */ | |
d4846487 | 604 | static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg, |
14303d20 | 605 | struct ceph_mds_reply_info_parsed *info, |
12b4629a | 606 | u64 features) |
2f2dc053 SW |
607 | { |
608 | void *p, *end; | |
609 | u32 len; | |
610 | int err; | |
611 | ||
612 | info->head = msg->front.iov_base; | |
613 | p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head); | |
614 | end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head); | |
615 | ||
616 | /* trace */ | |
617 | ceph_decode_32_safe(&p, end, len, bad); | |
618 | if (len > 0) { | |
32852a81 | 619 | ceph_decode_need(&p, end, len, bad); |
14303d20 | 620 | err = parse_reply_info_trace(&p, p+len, info, features); |
2f2dc053 SW |
621 | if (err < 0) |
622 | goto out_bad; | |
623 | } | |
624 | ||
25933abd | 625 | /* extra */ |
2f2dc053 SW |
626 | ceph_decode_32_safe(&p, end, len, bad); |
627 | if (len > 0) { | |
32852a81 | 628 | ceph_decode_need(&p, end, len, bad); |
d4846487 | 629 | err = parse_reply_info_extra(&p, p+len, info, features, s); |
2f2dc053 SW |
630 | if (err < 0) |
631 | goto out_bad; | |
632 | } | |
633 | ||
634 | /* snap blob */ | |
635 | ceph_decode_32_safe(&p, end, len, bad); | |
636 | info->snapblob_len = len; | |
637 | info->snapblob = p; | |
638 | p += len; | |
639 | ||
640 | if (p != end) | |
641 | goto bad; | |
642 | return 0; | |
643 | ||
644 | bad: | |
645 | err = -EIO; | |
646 | out_bad: | |
647 | pr_err("mds parse_reply err %d\n", err); | |
648 | return err; | |
649 | } | |
650 | ||
651 | static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info) | |
652 | { | |
2a5beea3 | 653 | if (!info->dir_entries) |
54008399 | 654 | return; |
2a5beea3 | 655 | free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size)); |
2f2dc053 SW |
656 | } |
657 | ||
4868e537 XL |
658 | /* |
659 | * In async unlink case the kclient won't wait for the first reply | |
660 | * from MDS and just drop all the links and unhash the dentry and then | |
661 | * succeeds immediately. | |
662 | * | |
663 | * For any new create/link/rename,etc requests followed by using the | |
664 | * same file names we must wait for the first reply of the inflight | |
665 | * unlink request, or the MDS possibly will fail these following | |
666 | * requests with -EEXIST if the inflight async unlink request was | |
667 | * delayed for some reasons. | |
668 | * | |
669 | * And the worst case is that for the none async openc request it will | |
670 | * successfully open the file if the CDentry hasn't been unlinked yet, | |
671 | * but later the previous delayed async unlink request will remove the | |
672 | * CDenty. That means the just created file is possiblly deleted later | |
673 | * by accident. | |
674 | * | |
675 | * We need to wait for the inflight async unlink requests to finish | |
676 | * when creating new files/directories by using the same file names. | |
677 | */ | |
678 | int ceph_wait_on_conflict_unlink(struct dentry *dentry) | |
679 | { | |
680 | struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); | |
681 | struct dentry *pdentry = dentry->d_parent; | |
682 | struct dentry *udentry, *found = NULL; | |
683 | struct ceph_dentry_info *di; | |
684 | struct qstr dname; | |
685 | u32 hash = dentry->d_name.hash; | |
686 | int err; | |
687 | ||
688 | dname.name = dentry->d_name.name; | |
689 | dname.len = dentry->d_name.len; | |
690 | ||
691 | rcu_read_lock(); | |
692 | hash_for_each_possible_rcu(fsc->async_unlink_conflict, di, | |
693 | hnode, hash) { | |
694 | udentry = di->dentry; | |
695 | ||
696 | spin_lock(&udentry->d_lock); | |
697 | if (udentry->d_name.hash != hash) | |
698 | goto next; | |
699 | if (unlikely(udentry->d_parent != pdentry)) | |
700 | goto next; | |
701 | if (!hash_hashed(&di->hnode)) | |
702 | goto next; | |
703 | ||
704 | if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags)) | |
705 | pr_warn("%s dentry %p:%pd async unlink bit is not set\n", | |
706 | __func__, dentry, dentry); | |
707 | ||
708 | if (!d_same_name(udentry, pdentry, &dname)) | |
709 | goto next; | |
710 | ||
711 | spin_unlock(&udentry->d_lock); | |
712 | found = dget(udentry); | |
713 | break; | |
714 | next: | |
715 | spin_unlock(&udentry->d_lock); | |
716 | } | |
717 | rcu_read_unlock(); | |
718 | ||
719 | if (likely(!found)) | |
720 | return 0; | |
721 | ||
722 | dout("%s dentry %p:%pd conflict with old %p:%pd\n", __func__, | |
723 | dentry, dentry, found, found); | |
724 | ||
725 | err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT, | |
726 | TASK_KILLABLE); | |
727 | dput(found); | |
728 | return err; | |
729 | } | |
730 | ||
2f2dc053 SW |
731 | |
732 | /* | |
733 | * sessions | |
734 | */ | |
a687ecaf | 735 | const char *ceph_session_state_name(int s) |
2f2dc053 SW |
736 | { |
737 | switch (s) { | |
738 | case CEPH_MDS_SESSION_NEW: return "new"; | |
739 | case CEPH_MDS_SESSION_OPENING: return "opening"; | |
740 | case CEPH_MDS_SESSION_OPEN: return "open"; | |
741 | case CEPH_MDS_SESSION_HUNG: return "hung"; | |
742 | case CEPH_MDS_SESSION_CLOSING: return "closing"; | |
4d681c2f | 743 | case CEPH_MDS_SESSION_CLOSED: return "closed"; |
44ca18f2 | 744 | case CEPH_MDS_SESSION_RESTARTING: return "restarting"; |
2f2dc053 | 745 | case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting"; |
fcff415c | 746 | case CEPH_MDS_SESSION_REJECTED: return "rejected"; |
2f2dc053 SW |
747 | default: return "???"; |
748 | } | |
749 | } | |
750 | ||
5b3248c6 | 751 | struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s) |
2f2dc053 | 752 | { |
9f358999 | 753 | if (refcount_inc_not_zero(&s->s_ref)) |
2f2dc053 | 754 | return s; |
9f358999 | 755 | return NULL; |
2f2dc053 SW |
756 | } |
757 | ||
758 | void ceph_put_mds_session(struct ceph_mds_session *s) | |
759 | { | |
7e65624d JL |
760 | if (IS_ERR_OR_NULL(s)) |
761 | return; | |
762 | ||
3997c01d | 763 | if (refcount_dec_and_test(&s->s_ref)) { |
6c4a1915 | 764 | if (s->s_auth.authorizer) |
6c1ea260 | 765 | ceph_auth_destroy_authorizer(s->s_auth.authorizer); |
88828190 | 766 | WARN_ON(mutex_is_locked(&s->s_mutex)); |
d4846487 | 767 | xa_destroy(&s->s_delegated_inos); |
2f2dc053 | 768 | kfree(s); |
4e7a5dcd | 769 | } |
2f2dc053 SW |
770 | } |
771 | ||
772 | /* | |
773 | * called under mdsc->mutex | |
774 | */ | |
775 | struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc, | |
776 | int mds) | |
777 | { | |
d37b1d99 | 778 | if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) |
2f2dc053 | 779 | return NULL; |
5b3248c6 | 780 | return ceph_get_mds_session(mdsc->sessions[mds]); |
2f2dc053 SW |
781 | } |
782 | ||
783 | static bool __have_session(struct ceph_mds_client *mdsc, int mds) | |
784 | { | |
98cfda81 | 785 | if (mds >= mdsc->max_sessions || !mdsc->sessions[mds]) |
2f2dc053 | 786 | return false; |
98cfda81 CX |
787 | else |
788 | return true; | |
2f2dc053 SW |
789 | } |
790 | ||
2600d2dd SW |
791 | static int __verify_registered_session(struct ceph_mds_client *mdsc, |
792 | struct ceph_mds_session *s) | |
793 | { | |
794 | if (s->s_mds >= mdsc->max_sessions || | |
795 | mdsc->sessions[s->s_mds] != s) | |
796 | return -ENOENT; | |
797 | return 0; | |
798 | } | |
799 | ||
2f2dc053 SW |
800 | /* |
801 | * create+register a new session for given mds. | |
802 | * called under mdsc->mutex. | |
803 | */ | |
804 | static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc, | |
805 | int mds) | |
806 | { | |
807 | struct ceph_mds_session *s; | |
808 | ||
b38c9eb4 | 809 | if (mds >= mdsc->mdsmap->possible_max_rank) |
c338c07c NY |
810 | return ERR_PTR(-EINVAL); |
811 | ||
2f2dc053 | 812 | s = kzalloc(sizeof(*s), GFP_NOFS); |
4736b009 DC |
813 | if (!s) |
814 | return ERR_PTR(-ENOMEM); | |
47474d0b CX |
815 | |
816 | if (mds >= mdsc->max_sessions) { | |
817 | int newmax = 1 << get_count_order(mds + 1); | |
818 | struct ceph_mds_session **sa; | |
819 | ||
820 | dout("%s: realloc to %d\n", __func__, newmax); | |
821 | sa = kcalloc(newmax, sizeof(void *), GFP_NOFS); | |
822 | if (!sa) | |
823 | goto fail_realloc; | |
824 | if (mdsc->sessions) { | |
825 | memcpy(sa, mdsc->sessions, | |
826 | mdsc->max_sessions * sizeof(void *)); | |
827 | kfree(mdsc->sessions); | |
828 | } | |
829 | mdsc->sessions = sa; | |
830 | mdsc->max_sessions = newmax; | |
831 | } | |
832 | ||
833 | dout("%s: mds%d\n", __func__, mds); | |
2f2dc053 SW |
834 | s->s_mdsc = mdsc; |
835 | s->s_mds = mds; | |
836 | s->s_state = CEPH_MDS_SESSION_NEW; | |
2f2dc053 SW |
837 | mutex_init(&s->s_mutex); |
838 | ||
b7a9e5dd | 839 | ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr); |
2f2dc053 | 840 | |
52d60f8e | 841 | atomic_set(&s->s_cap_gen, 1); |
1ce208a6 | 842 | s->s_cap_ttl = jiffies - 1; |
d8fb02ab AE |
843 | |
844 | spin_lock_init(&s->s_cap_lock); | |
2f2dc053 | 845 | INIT_LIST_HEAD(&s->s_caps); |
3997c01d | 846 | refcount_set(&s->s_ref, 1); |
2f2dc053 SW |
847 | INIT_LIST_HEAD(&s->s_waiting); |
848 | INIT_LIST_HEAD(&s->s_unsafe); | |
d4846487 | 849 | xa_init(&s->s_delegated_inos); |
2f2dc053 | 850 | INIT_LIST_HEAD(&s->s_cap_releases); |
e3ec8d68 YZ |
851 | INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work); |
852 | ||
1cf03a68 | 853 | INIT_LIST_HEAD(&s->s_cap_dirty); |
2f2dc053 | 854 | INIT_LIST_HEAD(&s->s_cap_flushing); |
2f2dc053 | 855 | |
2f2dc053 | 856 | mdsc->sessions[mds] = s; |
86d8f67b | 857 | atomic_inc(&mdsc->num_sessions); |
3997c01d | 858 | refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */ |
42ce56e5 | 859 | |
b7a9e5dd SW |
860 | ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds, |
861 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
42ce56e5 | 862 | |
2f2dc053 | 863 | return s; |
42ce56e5 SW |
864 | |
865 | fail_realloc: | |
866 | kfree(s); | |
867 | return ERR_PTR(-ENOMEM); | |
2f2dc053 SW |
868 | } |
869 | ||
870 | /* | |
871 | * called under mdsc->mutex | |
872 | */ | |
2600d2dd | 873 | static void __unregister_session(struct ceph_mds_client *mdsc, |
42ce56e5 | 874 | struct ceph_mds_session *s) |
2f2dc053 | 875 | { |
2600d2dd SW |
876 | dout("__unregister_session mds%d %p\n", s->s_mds, s); |
877 | BUG_ON(mdsc->sessions[s->s_mds] != s); | |
42ce56e5 SW |
878 | mdsc->sessions[s->s_mds] = NULL; |
879 | ceph_con_close(&s->s_con); | |
880 | ceph_put_mds_session(s); | |
86d8f67b | 881 | atomic_dec(&mdsc->num_sessions); |
2f2dc053 SW |
882 | } |
883 | ||
884 | /* | |
885 | * drop session refs in request. | |
886 | * | |
887 | * should be last request ref, or hold mdsc->mutex | |
888 | */ | |
889 | static void put_request_session(struct ceph_mds_request *req) | |
890 | { | |
891 | if (req->r_session) { | |
892 | ceph_put_mds_session(req->r_session); | |
893 | req->r_session = NULL; | |
894 | } | |
895 | } | |
896 | ||
59b312f3 XL |
897 | void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, |
898 | void (*cb)(struct ceph_mds_session *), | |
899 | bool check_state) | |
900 | { | |
901 | int mds; | |
902 | ||
903 | mutex_lock(&mdsc->mutex); | |
904 | for (mds = 0; mds < mdsc->max_sessions; ++mds) { | |
905 | struct ceph_mds_session *s; | |
906 | ||
907 | s = __ceph_lookup_mds_session(mdsc, mds); | |
908 | if (!s) | |
909 | continue; | |
910 | ||
911 | if (check_state && !check_session_state(s)) { | |
912 | ceph_put_mds_session(s); | |
913 | continue; | |
914 | } | |
915 | ||
916 | mutex_unlock(&mdsc->mutex); | |
917 | cb(s); | |
918 | ceph_put_mds_session(s); | |
919 | mutex_lock(&mdsc->mutex); | |
920 | } | |
921 | mutex_unlock(&mdsc->mutex); | |
922 | } | |
923 | ||
153c8e6b | 924 | void ceph_mdsc_release_request(struct kref *kref) |
2f2dc053 | 925 | { |
153c8e6b SW |
926 | struct ceph_mds_request *req = container_of(kref, |
927 | struct ceph_mds_request, | |
928 | r_kref); | |
e64f44a8 | 929 | ceph_mdsc_release_dir_caps_no_check(req); |
54008399 | 930 | destroy_reply_info(&req->r_reply_info); |
153c8e6b SW |
931 | if (req->r_request) |
932 | ceph_msg_put(req->r_request); | |
54008399 | 933 | if (req->r_reply) |
153c8e6b | 934 | ceph_msg_put(req->r_reply); |
153c8e6b | 935 | if (req->r_inode) { |
41b02e1f | 936 | ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); |
23c2c76e | 937 | iput(req->r_inode); |
153c8e6b | 938 | } |
9c1c2b35 | 939 | if (req->r_parent) { |
3dd69aab | 940 | ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN); |
23c2c76e | 941 | iput(req->r_parent); |
9c1c2b35 | 942 | } |
23c2c76e | 943 | iput(req->r_target_inode); |
153c8e6b SW |
944 | if (req->r_dentry) |
945 | dput(req->r_dentry); | |
844d87c3 SW |
946 | if (req->r_old_dentry) |
947 | dput(req->r_old_dentry); | |
948 | if (req->r_old_dentry_dir) { | |
41b02e1f SW |
949 | /* |
950 | * track (and drop pins for) r_old_dentry_dir | |
951 | * separately, since r_old_dentry's d_parent may have | |
952 | * changed between the dir mutex being dropped and | |
953 | * this request being freed. | |
954 | */ | |
955 | ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
956 | CEPH_CAP_PIN); | |
23c2c76e | 957 | iput(req->r_old_dentry_dir); |
2f2dc053 | 958 | } |
153c8e6b SW |
959 | kfree(req->r_path1); |
960 | kfree(req->r_path2); | |
7fe0cdeb | 961 | put_cred(req->r_cred); |
25e6bae3 YZ |
962 | if (req->r_pagelist) |
963 | ceph_pagelist_release(req->r_pagelist); | |
153c8e6b | 964 | put_request_session(req); |
37151668 | 965 | ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); |
428138c9 | 966 | WARN_ON_ONCE(!list_empty(&req->r_wait)); |
058daab7 | 967 | kmem_cache_free(ceph_mds_request_cachep, req); |
2f2dc053 SW |
968 | } |
969 | ||
fcd00b68 ID |
970 | DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node) |
971 | ||
2f2dc053 SW |
972 | /* |
973 | * lookup session, bump ref if found. | |
974 | * | |
975 | * called under mdsc->mutex. | |
976 | */ | |
fcd00b68 ID |
977 | static struct ceph_mds_request * |
978 | lookup_get_request(struct ceph_mds_client *mdsc, u64 tid) | |
2f2dc053 SW |
979 | { |
980 | struct ceph_mds_request *req; | |
44ca18f2 | 981 | |
fcd00b68 ID |
982 | req = lookup_request(&mdsc->request_tree, tid); |
983 | if (req) | |
984 | ceph_mdsc_get_request(req); | |
44ca18f2 | 985 | |
fcd00b68 | 986 | return req; |
2f2dc053 SW |
987 | } |
988 | ||
989 | /* | |
990 | * Register an in-flight request, and assign a tid. Link to directory | |
991 | * are modifying (if any). | |
992 | * | |
993 | * Called under mdsc->mutex. | |
994 | */ | |
995 | static void __register_request(struct ceph_mds_client *mdsc, | |
996 | struct ceph_mds_request *req, | |
997 | struct inode *dir) | |
998 | { | |
e30ee581 ZZ |
999 | int ret = 0; |
1000 | ||
2f2dc053 | 1001 | req->r_tid = ++mdsc->last_tid; |
e30ee581 ZZ |
1002 | if (req->r_num_caps) { |
1003 | ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation, | |
1004 | req->r_num_caps); | |
1005 | if (ret < 0) { | |
1006 | pr_err("__register_request %p " | |
1007 | "failed to reserve caps: %d\n", req, ret); | |
1008 | /* set req->r_err to fail early from __do_request */ | |
1009 | req->r_err = ret; | |
1010 | return; | |
1011 | } | |
1012 | } | |
2f2dc053 SW |
1013 | dout("__register_request %p tid %lld\n", req, req->r_tid); |
1014 | ceph_mdsc_get_request(req); | |
fcd00b68 | 1015 | insert_request(&mdsc->request_tree, req); |
2f2dc053 | 1016 | |
7fe0cdeb | 1017 | req->r_cred = get_current_cred(); |
cb4276cc | 1018 | |
e8a7b8b1 YZ |
1019 | if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK) |
1020 | mdsc->oldest_tid = req->r_tid; | |
1021 | ||
2f2dc053 | 1022 | if (dir) { |
3db0a2fc JL |
1023 | struct ceph_inode_info *ci = ceph_inode(dir); |
1024 | ||
3b663780 | 1025 | ihold(dir); |
2f2dc053 | 1026 | req->r_unsafe_dir = dir; |
3db0a2fc JL |
1027 | spin_lock(&ci->i_unsafe_lock); |
1028 | list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops); | |
1029 | spin_unlock(&ci->i_unsafe_lock); | |
2f2dc053 SW |
1030 | } |
1031 | } | |
1032 | ||
1033 | static void __unregister_request(struct ceph_mds_client *mdsc, | |
1034 | struct ceph_mds_request *req) | |
1035 | { | |
1036 | dout("__unregister_request %p tid %lld\n", req, req->r_tid); | |
e8a7b8b1 | 1037 | |
df963ea8 JL |
1038 | /* Never leave an unregistered request on an unsafe list! */ |
1039 | list_del_init(&req->r_unsafe_item); | |
1040 | ||
e8a7b8b1 YZ |
1041 | if (req->r_tid == mdsc->oldest_tid) { |
1042 | struct rb_node *p = rb_next(&req->r_node); | |
1043 | mdsc->oldest_tid = 0; | |
1044 | while (p) { | |
1045 | struct ceph_mds_request *next_req = | |
1046 | rb_entry(p, struct ceph_mds_request, r_node); | |
1047 | if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) { | |
1048 | mdsc->oldest_tid = next_req->r_tid; | |
1049 | break; | |
1050 | } | |
1051 | p = rb_next(p); | |
1052 | } | |
1053 | } | |
1054 | ||
fcd00b68 | 1055 | erase_request(&mdsc->request_tree, req); |
2f2dc053 | 1056 | |
3db0a2fc | 1057 | if (req->r_unsafe_dir) { |
2f2dc053 | 1058 | struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir); |
2f2dc053 SW |
1059 | spin_lock(&ci->i_unsafe_lock); |
1060 | list_del_init(&req->r_unsafe_dir_item); | |
1061 | spin_unlock(&ci->i_unsafe_lock); | |
4c06ace8 | 1062 | } |
bc2de10d JL |
1063 | if (req->r_target_inode && |
1064 | test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { | |
68cd5b4b YZ |
1065 | struct ceph_inode_info *ci = ceph_inode(req->r_target_inode); |
1066 | spin_lock(&ci->i_unsafe_lock); | |
1067 | list_del_init(&req->r_unsafe_target_item); | |
1068 | spin_unlock(&ci->i_unsafe_lock); | |
1069 | } | |
3b663780 | 1070 | |
4c06ace8 | 1071 | if (req->r_unsafe_dir) { |
23c2c76e | 1072 | iput(req->r_unsafe_dir); |
3b663780 | 1073 | req->r_unsafe_dir = NULL; |
2f2dc053 | 1074 | } |
94aa8ae1 | 1075 | |
fc55d2c9 YZ |
1076 | complete_all(&req->r_safe_completion); |
1077 | ||
94aa8ae1 | 1078 | ceph_mdsc_put_request(req); |
2f2dc053 SW |
1079 | } |
1080 | ||
30c71233 JL |
1081 | /* |
1082 | * Walk back up the dentry tree until we hit a dentry representing a | |
1083 | * non-snapshot inode. We do this using the rcu_read_lock (which must be held | |
1084 | * when calling this) to ensure that the objects won't disappear while we're | |
1085 | * working with them. Once we hit a candidate dentry, we attempt to take a | |
1086 | * reference to it, and return that as the result. | |
1087 | */ | |
f1075480 DC |
1088 | static struct inode *get_nonsnap_parent(struct dentry *dentry) |
1089 | { | |
1090 | struct inode *inode = NULL; | |
30c71233 JL |
1091 | |
1092 | while (dentry && !IS_ROOT(dentry)) { | |
1093 | inode = d_inode_rcu(dentry); | |
1094 | if (!inode || ceph_snap(inode) == CEPH_NOSNAP) | |
1095 | break; | |
1096 | dentry = dentry->d_parent; | |
1097 | } | |
1098 | if (inode) | |
1099 | inode = igrab(inode); | |
1100 | return inode; | |
1101 | } | |
1102 | ||
2f2dc053 SW |
1103 | /* |
1104 | * Choose mds to send request to next. If there is a hint set in the | |
1105 | * request (e.g., due to a prior forward hint from the mds), use that. | |
1106 | * Otherwise, consult frag tree and/or caps to identify the | |
1107 | * appropriate mds. If all else fails, choose randomly. | |
1108 | * | |
1109 | * Called under mdsc->mutex. | |
1110 | */ | |
1111 | static int __choose_mds(struct ceph_mds_client *mdsc, | |
c4853e97 XL |
1112 | struct ceph_mds_request *req, |
1113 | bool *random) | |
2f2dc053 SW |
1114 | { |
1115 | struct inode *inode; | |
1116 | struct ceph_inode_info *ci; | |
1117 | struct ceph_cap *cap; | |
1118 | int mode = req->r_direct_mode; | |
1119 | int mds = -1; | |
1120 | u32 hash = req->r_direct_hash; | |
bc2de10d | 1121 | bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); |
2f2dc053 | 1122 | |
c4853e97 XL |
1123 | if (random) |
1124 | *random = false; | |
1125 | ||
2f2dc053 SW |
1126 | /* |
1127 | * is there a specific mds we should try? ignore hint if we have | |
1128 | * no session and the mds is not up (active or recovering). | |
1129 | */ | |
1130 | if (req->r_resend_mds >= 0 && | |
1131 | (__have_session(mdsc, req->r_resend_mds) || | |
1132 | ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) { | |
3c802092 | 1133 | dout("%s using resend_mds mds%d\n", __func__, |
2f2dc053 SW |
1134 | req->r_resend_mds); |
1135 | return req->r_resend_mds; | |
1136 | } | |
1137 | ||
1138 | if (mode == USE_RANDOM_MDS) | |
1139 | goto random; | |
1140 | ||
1141 | inode = NULL; | |
1142 | if (req->r_inode) { | |
5d37ca14 YZ |
1143 | if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) { |
1144 | inode = req->r_inode; | |
1145 | ihold(inode); | |
1146 | } else { | |
38f340cc YZ |
1147 | /* req->r_dentry is non-null for LSSNAP request */ |
1148 | rcu_read_lock(); | |
1149 | inode = get_nonsnap_parent(req->r_dentry); | |
1150 | rcu_read_unlock(); | |
3c802092 | 1151 | dout("%s using snapdir's parent %p\n", __func__, inode); |
5d37ca14 | 1152 | } |
38f340cc | 1153 | } else if (req->r_dentry) { |
d79698da | 1154 | /* ignore race with rename; old or new d_parent is okay */ |
30c71233 JL |
1155 | struct dentry *parent; |
1156 | struct inode *dir; | |
1157 | ||
1158 | rcu_read_lock(); | |
41883ba8 | 1159 | parent = READ_ONCE(req->r_dentry->d_parent); |
3dd69aab | 1160 | dir = req->r_parent ? : d_inode_rcu(parent); |
eb6bb1c5 | 1161 | |
30c71233 JL |
1162 | if (!dir || dir->i_sb != mdsc->fsc->sb) { |
1163 | /* not this fs or parent went negative */ | |
2b0143b5 | 1164 | inode = d_inode(req->r_dentry); |
30c71233 JL |
1165 | if (inode) |
1166 | ihold(inode); | |
eb6bb1c5 SW |
1167 | } else if (ceph_snap(dir) != CEPH_NOSNAP) { |
1168 | /* direct snapped/virtual snapdir requests | |
1169 | * based on parent dir inode */ | |
30c71233 | 1170 | inode = get_nonsnap_parent(parent); |
3c802092 | 1171 | dout("%s using nonsnap parent %p\n", __func__, inode); |
ca18bede | 1172 | } else { |
eb6bb1c5 | 1173 | /* dentry target */ |
2b0143b5 | 1174 | inode = d_inode(req->r_dentry); |
ca18bede YZ |
1175 | if (!inode || mode == USE_AUTH_MDS) { |
1176 | /* dir + name */ | |
30c71233 | 1177 | inode = igrab(dir); |
ca18bede YZ |
1178 | hash = ceph_dentry_hash(dir, req->r_dentry); |
1179 | is_hash = true; | |
30c71233 JL |
1180 | } else { |
1181 | ihold(inode); | |
ca18bede | 1182 | } |
2f2dc053 | 1183 | } |
30c71233 | 1184 | rcu_read_unlock(); |
2f2dc053 | 1185 | } |
eb6bb1c5 | 1186 | |
3c802092 XL |
1187 | dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash, |
1188 | hash, mode); | |
2f2dc053 SW |
1189 | if (!inode) |
1190 | goto random; | |
1191 | ci = ceph_inode(inode); | |
1192 | ||
1193 | if (is_hash && S_ISDIR(inode->i_mode)) { | |
1194 | struct ceph_inode_frag frag; | |
1195 | int found; | |
1196 | ||
1197 | ceph_choose_frag(ci, hash, &frag, &found); | |
1198 | if (found) { | |
1199 | if (mode == USE_ANY_MDS && frag.ndist > 0) { | |
1200 | u8 r; | |
1201 | ||
1202 | /* choose a random replica */ | |
1203 | get_random_bytes(&r, 1); | |
1204 | r %= frag.ndist; | |
1205 | mds = frag.dist[r]; | |
3c802092 XL |
1206 | dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n", |
1207 | __func__, inode, ceph_vinop(inode), | |
1208 | frag.frag, mds, (int)r, frag.ndist); | |
d66bbd44 | 1209 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
5d47648f XL |
1210 | CEPH_MDS_STATE_ACTIVE && |
1211 | !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds)) | |
30c71233 | 1212 | goto out; |
2f2dc053 SW |
1213 | } |
1214 | ||
1215 | /* since this file/dir wasn't known to be | |
1216 | * replicated, then we want to look for the | |
1217 | * authoritative mds. */ | |
2f2dc053 SW |
1218 | if (frag.mds >= 0) { |
1219 | /* choose auth mds */ | |
1220 | mds = frag.mds; | |
3c802092 XL |
1221 | dout("%s %p %llx.%llx frag %u mds%d (auth)\n", |
1222 | __func__, inode, ceph_vinop(inode), | |
1223 | frag.frag, mds); | |
d66bbd44 | 1224 | if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >= |
5d47648f | 1225 | CEPH_MDS_STATE_ACTIVE) { |
224c7b67 | 1226 | if (!ceph_mdsmap_is_laggy(mdsc->mdsmap, |
5d47648f XL |
1227 | mds)) |
1228 | goto out; | |
1229 | } | |
2f2dc053 | 1230 | } |
5d47648f | 1231 | mode = USE_AUTH_MDS; |
2f2dc053 SW |
1232 | } |
1233 | } | |
1234 | ||
be655596 | 1235 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1236 | cap = NULL; |
1237 | if (mode == USE_AUTH_MDS) | |
1238 | cap = ci->i_auth_cap; | |
1239 | if (!cap && !RB_EMPTY_ROOT(&ci->i_caps)) | |
1240 | cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node); | |
1241 | if (!cap) { | |
be655596 | 1242 | spin_unlock(&ci->i_ceph_lock); |
23c2c76e | 1243 | iput(inode); |
2f2dc053 SW |
1244 | goto random; |
1245 | } | |
1246 | mds = cap->session->s_mds; | |
3c802092 | 1247 | dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__, |
2f2dc053 SW |
1248 | inode, ceph_vinop(inode), mds, |
1249 | cap == ci->i_auth_cap ? "auth " : "", cap); | |
be655596 | 1250 | spin_unlock(&ci->i_ceph_lock); |
30c71233 | 1251 | out: |
23c2c76e | 1252 | iput(inode); |
2f2dc053 SW |
1253 | return mds; |
1254 | ||
1255 | random: | |
c4853e97 XL |
1256 | if (random) |
1257 | *random = true; | |
1258 | ||
2f2dc053 | 1259 | mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap); |
3c802092 | 1260 | dout("%s chose random mds%d\n", __func__, mds); |
2f2dc053 SW |
1261 | return mds; |
1262 | } | |
1263 | ||
1264 | ||
1265 | /* | |
1266 | * session messages | |
1267 | */ | |
fba97e80 | 1268 | struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq) |
2f2dc053 SW |
1269 | { |
1270 | struct ceph_msg *msg; | |
1271 | struct ceph_mds_session_head *h; | |
1272 | ||
b61c2763 SW |
1273 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS, |
1274 | false); | |
a79832f2 | 1275 | if (!msg) { |
fba97e80 XL |
1276 | pr_err("ENOMEM creating session %s msg\n", |
1277 | ceph_session_op_name(op)); | |
a79832f2 | 1278 | return NULL; |
2f2dc053 SW |
1279 | } |
1280 | h = msg->front.iov_base; | |
1281 | h->op = cpu_to_le32(op); | |
1282 | h->seq = cpu_to_le64(seq); | |
dbd0c8bf JS |
1283 | |
1284 | return msg; | |
1285 | } | |
1286 | ||
9ba1e224 XL |
1287 | static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED; |
1288 | #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8) | |
b682c6d4 | 1289 | static int encode_supported_features(void **p, void *end) |
342ce182 | 1290 | { |
9ba1e224 | 1291 | static const size_t count = ARRAY_SIZE(feature_bits); |
342ce182 YZ |
1292 | |
1293 | if (count > 0) { | |
1294 | size_t i; | |
9ba1e224 | 1295 | size_t size = FEATURE_BYTES(count); |
fea013e0 | 1296 | unsigned long bit; |
342ce182 | 1297 | |
b682c6d4 XL |
1298 | if (WARN_ON_ONCE(*p + 4 + size > end)) |
1299 | return -ERANGE; | |
1300 | ||
342ce182 YZ |
1301 | ceph_encode_32(p, size); |
1302 | memset(*p, 0, size); | |
fea013e0 LH |
1303 | for (i = 0; i < count; i++) { |
1304 | bit = feature_bits[i]; | |
1305 | ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8); | |
1306 | } | |
342ce182 YZ |
1307 | *p += size; |
1308 | } else { | |
b682c6d4 XL |
1309 | if (WARN_ON_ONCE(*p + 4 > end)) |
1310 | return -ERANGE; | |
1311 | ||
342ce182 YZ |
1312 | ceph_encode_32(p, 0); |
1313 | } | |
b682c6d4 XL |
1314 | |
1315 | return 0; | |
342ce182 YZ |
1316 | } |
1317 | ||
3b4168dd XL |
1318 | static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED; |
1319 | #define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8) | |
1320 | static int encode_metric_spec(void **p, void *end) | |
1321 | { | |
1322 | static const size_t count = ARRAY_SIZE(metric_bits); | |
1323 | ||
1324 | /* header */ | |
1325 | if (WARN_ON_ONCE(*p + 2 > end)) | |
1326 | return -ERANGE; | |
1327 | ||
1328 | ceph_encode_8(p, 1); /* version */ | |
1329 | ceph_encode_8(p, 1); /* compat */ | |
1330 | ||
1331 | if (count > 0) { | |
1332 | size_t i; | |
1333 | size_t size = METRIC_BYTES(count); | |
1334 | ||
1335 | if (WARN_ON_ONCE(*p + 4 + 4 + size > end)) | |
1336 | return -ERANGE; | |
1337 | ||
1338 | /* metric spec info length */ | |
1339 | ceph_encode_32(p, 4 + size); | |
1340 | ||
1341 | /* metric spec */ | |
1342 | ceph_encode_32(p, size); | |
1343 | memset(*p, 0, size); | |
1344 | for (i = 0; i < count; i++) | |
1345 | ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8); | |
1346 | *p += size; | |
1347 | } else { | |
1348 | if (WARN_ON_ONCE(*p + 4 + 4 > end)) | |
1349 | return -ERANGE; | |
1350 | ||
1351 | /* metric spec info length */ | |
1352 | ceph_encode_32(p, 4); | |
1353 | /* metric spec */ | |
1354 | ceph_encode_32(p, 0); | |
1355 | } | |
1356 | ||
1357 | return 0; | |
1358 | } | |
1359 | ||
dbd0c8bf JS |
1360 | /* |
1361 | * session message, specialization for CEPH_SESSION_REQUEST_OPEN | |
1362 | * to include additional client metadata fields. | |
1363 | */ | |
1364 | static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq) | |
1365 | { | |
1366 | struct ceph_msg *msg; | |
1367 | struct ceph_mds_session_head *h; | |
4a756db2 | 1368 | int i; |
342ce182 | 1369 | int extra_bytes = 0; |
dbd0c8bf JS |
1370 | int metadata_key_count = 0; |
1371 | struct ceph_options *opt = mdsc->fsc->client->options; | |
3f384954 | 1372 | struct ceph_mount_options *fsopt = mdsc->fsc->mount_options; |
9ba1e224 | 1373 | size_t size, count; |
342ce182 | 1374 | void *p, *end; |
b682c6d4 | 1375 | int ret; |
dbd0c8bf | 1376 | |
a6a5ce4f | 1377 | const char* metadata[][2] = { |
717e6f28 YZ |
1378 | {"hostname", mdsc->nodename}, |
1379 | {"kernel_version", init_utsname()->release}, | |
3f384954 YZ |
1380 | {"entity_id", opt->name ? : ""}, |
1381 | {"root", fsopt->server_path ? : "/"}, | |
dbd0c8bf JS |
1382 | {NULL, NULL} |
1383 | }; | |
1384 | ||
1385 | /* Calculate serialized length of metadata */ | |
342ce182 | 1386 | extra_bytes = 4; /* map length */ |
d37b1d99 | 1387 | for (i = 0; metadata[i][0]; ++i) { |
342ce182 | 1388 | extra_bytes += 8 + strlen(metadata[i][0]) + |
dbd0c8bf JS |
1389 | strlen(metadata[i][1]); |
1390 | metadata_key_count++; | |
1391 | } | |
9ba1e224 | 1392 | |
342ce182 | 1393 | /* supported feature */ |
9ba1e224 XL |
1394 | size = 0; |
1395 | count = ARRAY_SIZE(feature_bits); | |
1396 | if (count > 0) | |
1397 | size = FEATURE_BYTES(count); | |
1398 | extra_bytes += 4 + size; | |
dbd0c8bf | 1399 | |
3b4168dd XL |
1400 | /* metric spec */ |
1401 | size = 0; | |
1402 | count = ARRAY_SIZE(metric_bits); | |
1403 | if (count > 0) | |
1404 | size = METRIC_BYTES(count); | |
1405 | extra_bytes += 2 + 4 + 4 + size; | |
1406 | ||
dbd0c8bf | 1407 | /* Allocate the message */ |
342ce182 | 1408 | msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes, |
dbd0c8bf JS |
1409 | GFP_NOFS, false); |
1410 | if (!msg) { | |
fba97e80 | 1411 | pr_err("ENOMEM creating session open msg\n"); |
b682c6d4 | 1412 | return ERR_PTR(-ENOMEM); |
dbd0c8bf | 1413 | } |
342ce182 YZ |
1414 | p = msg->front.iov_base; |
1415 | end = p + msg->front.iov_len; | |
1416 | ||
1417 | h = p; | |
dbd0c8bf JS |
1418 | h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN); |
1419 | h->seq = cpu_to_le64(seq); | |
1420 | ||
1421 | /* | |
1422 | * Serialize client metadata into waiting buffer space, using | |
1423 | * the format that userspace expects for map<string, string> | |
7cfa0313 | 1424 | * |
3b4168dd | 1425 | * ClientSession messages with metadata are v4 |
dbd0c8bf | 1426 | */ |
3b4168dd | 1427 | msg->hdr.version = cpu_to_le16(4); |
7cfa0313 | 1428 | msg->hdr.compat_version = cpu_to_le16(1); |
dbd0c8bf JS |
1429 | |
1430 | /* The write pointer, following the session_head structure */ | |
342ce182 | 1431 | p += sizeof(*h); |
dbd0c8bf JS |
1432 | |
1433 | /* Number of entries in the map */ | |
1434 | ceph_encode_32(&p, metadata_key_count); | |
1435 | ||
1436 | /* Two length-prefixed strings for each entry in the map */ | |
d37b1d99 | 1437 | for (i = 0; metadata[i][0]; ++i) { |
dbd0c8bf JS |
1438 | size_t const key_len = strlen(metadata[i][0]); |
1439 | size_t const val_len = strlen(metadata[i][1]); | |
1440 | ||
1441 | ceph_encode_32(&p, key_len); | |
1442 | memcpy(p, metadata[i][0], key_len); | |
1443 | p += key_len; | |
1444 | ceph_encode_32(&p, val_len); | |
1445 | memcpy(p, metadata[i][1], val_len); | |
1446 | p += val_len; | |
1447 | } | |
1448 | ||
b682c6d4 XL |
1449 | ret = encode_supported_features(&p, end); |
1450 | if (ret) { | |
1451 | pr_err("encode_supported_features failed!\n"); | |
1452 | ceph_msg_put(msg); | |
1453 | return ERR_PTR(ret); | |
1454 | } | |
1455 | ||
3b4168dd XL |
1456 | ret = encode_metric_spec(&p, end); |
1457 | if (ret) { | |
1458 | pr_err("encode_metric_spec failed!\n"); | |
1459 | ceph_msg_put(msg); | |
1460 | return ERR_PTR(ret); | |
1461 | } | |
1462 | ||
342ce182 YZ |
1463 | msg->front.iov_len = p - msg->front.iov_base; |
1464 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
1465 | ||
2f2dc053 SW |
1466 | return msg; |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * send session open request. | |
1471 | * | |
1472 | * called under mdsc->mutex | |
1473 | */ | |
1474 | static int __open_session(struct ceph_mds_client *mdsc, | |
1475 | struct ceph_mds_session *session) | |
1476 | { | |
1477 | struct ceph_msg *msg; | |
1478 | int mstate; | |
1479 | int mds = session->s_mds; | |
2f2dc053 SW |
1480 | |
1481 | /* wait for mds to go active? */ | |
1482 | mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds); | |
1483 | dout("open_session to mds%d (%s)\n", mds, | |
1484 | ceph_mds_state_name(mstate)); | |
1485 | session->s_state = CEPH_MDS_SESSION_OPENING; | |
1486 | session->s_renew_requested = jiffies; | |
1487 | ||
1488 | /* send connect message */ | |
dbd0c8bf | 1489 | msg = create_session_open_msg(mdsc, session->s_seq); |
b682c6d4 XL |
1490 | if (IS_ERR(msg)) |
1491 | return PTR_ERR(msg); | |
2f2dc053 | 1492 | ceph_con_send(&session->s_con, msg); |
2f2dc053 SW |
1493 | return 0; |
1494 | } | |
1495 | ||
ed0552a1 SW |
1496 | /* |
1497 | * open sessions for any export targets for the given mds | |
1498 | * | |
1499 | * called under mdsc->mutex | |
1500 | */ | |
5d72d13c YZ |
1501 | static struct ceph_mds_session * |
1502 | __open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
1503 | { | |
1504 | struct ceph_mds_session *session; | |
b682c6d4 | 1505 | int ret; |
5d72d13c YZ |
1506 | |
1507 | session = __ceph_lookup_mds_session(mdsc, target); | |
1508 | if (!session) { | |
1509 | session = register_session(mdsc, target); | |
1510 | if (IS_ERR(session)) | |
1511 | return session; | |
1512 | } | |
1513 | if (session->s_state == CEPH_MDS_SESSION_NEW || | |
b682c6d4 XL |
1514 | session->s_state == CEPH_MDS_SESSION_CLOSING) { |
1515 | ret = __open_session(mdsc, session); | |
1516 | if (ret) | |
1517 | return ERR_PTR(ret); | |
1518 | } | |
5d72d13c YZ |
1519 | |
1520 | return session; | |
1521 | } | |
1522 | ||
1523 | struct ceph_mds_session * | |
1524 | ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target) | |
1525 | { | |
1526 | struct ceph_mds_session *session; | |
1527 | ||
1528 | dout("open_export_target_session to mds%d\n", target); | |
1529 | ||
1530 | mutex_lock(&mdsc->mutex); | |
1531 | session = __open_export_target_session(mdsc, target); | |
1532 | mutex_unlock(&mdsc->mutex); | |
1533 | ||
1534 | return session; | |
1535 | } | |
1536 | ||
ed0552a1 SW |
1537 | static void __open_export_target_sessions(struct ceph_mds_client *mdsc, |
1538 | struct ceph_mds_session *session) | |
1539 | { | |
1540 | struct ceph_mds_info *mi; | |
1541 | struct ceph_mds_session *ts; | |
1542 | int i, mds = session->s_mds; | |
ed0552a1 | 1543 | |
b38c9eb4 | 1544 | if (mds >= mdsc->mdsmap->possible_max_rank) |
ed0552a1 | 1545 | return; |
5d72d13c | 1546 | |
ed0552a1 SW |
1547 | mi = &mdsc->mdsmap->m_info[mds]; |
1548 | dout("open_export_target_sessions for mds%d (%d targets)\n", | |
1549 | session->s_mds, mi->num_export_targets); | |
1550 | ||
1551 | for (i = 0; i < mi->num_export_targets; i++) { | |
5d72d13c | 1552 | ts = __open_export_target_session(mdsc, mi->export_targets[i]); |
7e65624d | 1553 | ceph_put_mds_session(ts); |
ed0552a1 SW |
1554 | } |
1555 | } | |
1556 | ||
154f42c2 SW |
1557 | void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
1558 | struct ceph_mds_session *session) | |
1559 | { | |
1560 | mutex_lock(&mdsc->mutex); | |
1561 | __open_export_target_sessions(mdsc, session); | |
1562 | mutex_unlock(&mdsc->mutex); | |
1563 | } | |
1564 | ||
2f2dc053 SW |
1565 | /* |
1566 | * session caps | |
1567 | */ | |
1568 | ||
c8a96a31 JL |
1569 | static void detach_cap_releases(struct ceph_mds_session *session, |
1570 | struct list_head *target) | |
2f2dc053 | 1571 | { |
c8a96a31 JL |
1572 | lockdep_assert_held(&session->s_cap_lock); |
1573 | ||
1574 | list_splice_init(&session->s_cap_releases, target); | |
745a8e3b | 1575 | session->s_num_cap_releases = 0; |
c8a96a31 JL |
1576 | dout("dispose_cap_releases mds%d\n", session->s_mds); |
1577 | } | |
2f2dc053 | 1578 | |
c8a96a31 JL |
1579 | static void dispose_cap_releases(struct ceph_mds_client *mdsc, |
1580 | struct list_head *dispose) | |
1581 | { | |
1582 | while (!list_empty(dispose)) { | |
745a8e3b YZ |
1583 | struct ceph_cap *cap; |
1584 | /* zero out the in-progress message */ | |
c8a96a31 | 1585 | cap = list_first_entry(dispose, struct ceph_cap, session_caps); |
745a8e3b YZ |
1586 | list_del(&cap->session_caps); |
1587 | ceph_put_cap(mdsc, cap); | |
2f2dc053 | 1588 | } |
2f2dc053 SW |
1589 | } |
1590 | ||
1c841a96 YZ |
1591 | static void cleanup_session_requests(struct ceph_mds_client *mdsc, |
1592 | struct ceph_mds_session *session) | |
1593 | { | |
1594 | struct ceph_mds_request *req; | |
1595 | struct rb_node *p; | |
1596 | ||
1597 | dout("cleanup_session_requests mds%d\n", session->s_mds); | |
1598 | mutex_lock(&mdsc->mutex); | |
1599 | while (!list_empty(&session->s_unsafe)) { | |
1600 | req = list_first_entry(&session->s_unsafe, | |
1601 | struct ceph_mds_request, r_unsafe_item); | |
3e0708b9 YZ |
1602 | pr_warn_ratelimited(" dropping unsafe request %llu\n", |
1603 | req->r_tid); | |
1bd85aa6 JL |
1604 | if (req->r_target_inode) |
1605 | mapping_set_error(req->r_target_inode->i_mapping, -EIO); | |
1606 | if (req->r_unsafe_dir) | |
1607 | mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO); | |
1c841a96 YZ |
1608 | __unregister_request(mdsc, req); |
1609 | } | |
1610 | /* zero r_attempts, so kick_requests() will re-send requests */ | |
1611 | p = rb_first(&mdsc->request_tree); | |
1612 | while (p) { | |
1613 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
1614 | p = rb_next(p); | |
1615 | if (req->r_session && | |
1616 | req->r_session->s_mds == session->s_mds) | |
1617 | req->r_attempts = 0; | |
1618 | } | |
1619 | mutex_unlock(&mdsc->mutex); | |
1620 | } | |
1621 | ||
2f2dc053 | 1622 | /* |
f818a736 SW |
1623 | * Helper to safely iterate over all caps associated with a session, with |
1624 | * special care taken to handle a racing __ceph_remove_cap(). | |
2f2dc053 | 1625 | * |
f818a736 | 1626 | * Caller must hold session s_mutex. |
2f2dc053 | 1627 | */ |
f5d77269 JL |
1628 | int ceph_iterate_session_caps(struct ceph_mds_session *session, |
1629 | int (*cb)(struct inode *, struct ceph_cap *, | |
1630 | void *), void *arg) | |
2f2dc053 | 1631 | { |
7c1332b8 SW |
1632 | struct list_head *p; |
1633 | struct ceph_cap *cap; | |
1634 | struct inode *inode, *last_inode = NULL; | |
1635 | struct ceph_cap *old_cap = NULL; | |
2f2dc053 SW |
1636 | int ret; |
1637 | ||
1638 | dout("iterate_session_caps %p mds%d\n", session, session->s_mds); | |
1639 | spin_lock(&session->s_cap_lock); | |
7c1332b8 SW |
1640 | p = session->s_caps.next; |
1641 | while (p != &session->s_caps) { | |
1642 | cap = list_entry(p, struct ceph_cap, session_caps); | |
874c8ca1 | 1643 | inode = igrab(&cap->ci->netfs.inode); |
7c1332b8 SW |
1644 | if (!inode) { |
1645 | p = p->next; | |
2f2dc053 | 1646 | continue; |
7c1332b8 SW |
1647 | } |
1648 | session->s_cap_iterator = cap; | |
2f2dc053 | 1649 | spin_unlock(&session->s_cap_lock); |
7c1332b8 SW |
1650 | |
1651 | if (last_inode) { | |
23c2c76e | 1652 | iput(last_inode); |
7c1332b8 SW |
1653 | last_inode = NULL; |
1654 | } | |
1655 | if (old_cap) { | |
37151668 | 1656 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 SW |
1657 | old_cap = NULL; |
1658 | } | |
1659 | ||
2f2dc053 | 1660 | ret = cb(inode, cap, arg); |
7c1332b8 SW |
1661 | last_inode = inode; |
1662 | ||
2f2dc053 | 1663 | spin_lock(&session->s_cap_lock); |
7c1332b8 | 1664 | p = p->next; |
d37b1d99 | 1665 | if (!cap->ci) { |
7c1332b8 SW |
1666 | dout("iterate_session_caps finishing cap %p removal\n", |
1667 | cap); | |
1668 | BUG_ON(cap->session != session); | |
745a8e3b | 1669 | cap->session = NULL; |
7c1332b8 SW |
1670 | list_del_init(&cap->session_caps); |
1671 | session->s_nr_caps--; | |
4f1d756d | 1672 | atomic64_dec(&session->s_mdsc->metric.total_caps); |
e3ec8d68 YZ |
1673 | if (cap->queue_release) |
1674 | __ceph_queue_cap_release(session, cap); | |
1675 | else | |
745a8e3b | 1676 | old_cap = cap; /* put_cap it w/o locks held */ |
7c1332b8 | 1677 | } |
5dacf091 SW |
1678 | if (ret < 0) |
1679 | goto out; | |
2f2dc053 | 1680 | } |
5dacf091 SW |
1681 | ret = 0; |
1682 | out: | |
7c1332b8 | 1683 | session->s_cap_iterator = NULL; |
2f2dc053 | 1684 | spin_unlock(&session->s_cap_lock); |
7c1332b8 | 1685 | |
23c2c76e | 1686 | iput(last_inode); |
7c1332b8 | 1687 | if (old_cap) |
37151668 | 1688 | ceph_put_cap(session->s_mdsc, old_cap); |
7c1332b8 | 1689 | |
5dacf091 | 1690 | return ret; |
2f2dc053 SW |
1691 | } |
1692 | ||
1693 | static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap, | |
6c99f254 | 1694 | void *arg) |
2f2dc053 SW |
1695 | { |
1696 | struct ceph_inode_info *ci = ceph_inode(inode); | |
6c93df5d | 1697 | bool invalidate = false; |
36e6da98 | 1698 | int iputs; |
6c99f254 | 1699 | |
2f2dc053 | 1700 | dout("removing cap %p, ci is %p, inode is %p\n", |
874c8ca1 | 1701 | cap, ci, &ci->netfs.inode); |
be655596 | 1702 | spin_lock(&ci->i_ceph_lock); |
36e6da98 | 1703 | iputs = ceph_purge_inode_cap(inode, cap, &invalidate); |
be655596 | 1704 | spin_unlock(&ci->i_ceph_lock); |
77310320 YZ |
1705 | |
1706 | wake_up_all(&ci->i_cap_wq); | |
6c93df5d YZ |
1707 | if (invalidate) |
1708 | ceph_queue_invalidate(inode); | |
36e6da98 | 1709 | while (iputs--) |
a6d37ccd | 1710 | iput(inode); |
2f2dc053 SW |
1711 | return 0; |
1712 | } | |
1713 | ||
1714 | /* | |
1715 | * caller must hold session s_mutex | |
1716 | */ | |
1717 | static void remove_session_caps(struct ceph_mds_session *session) | |
1718 | { | |
6c93df5d YZ |
1719 | struct ceph_fs_client *fsc = session->s_mdsc->fsc; |
1720 | struct super_block *sb = fsc->sb; | |
c8a96a31 JL |
1721 | LIST_HEAD(dispose); |
1722 | ||
2f2dc053 | 1723 | dout("remove_session_caps on %p\n", session); |
f5d77269 | 1724 | ceph_iterate_session_caps(session, remove_session_caps_cb, fsc); |
6f60f889 | 1725 | |
c8799fc4 YZ |
1726 | wake_up_all(&fsc->mdsc->cap_flushing_wq); |
1727 | ||
6f60f889 YZ |
1728 | spin_lock(&session->s_cap_lock); |
1729 | if (session->s_nr_caps > 0) { | |
6f60f889 YZ |
1730 | struct inode *inode; |
1731 | struct ceph_cap *cap, *prev = NULL; | |
1732 | struct ceph_vino vino; | |
1733 | /* | |
1734 | * iterate_session_caps() skips inodes that are being | |
1735 | * deleted, we need to wait until deletions are complete. | |
1736 | * __wait_on_freeing_inode() is designed for the job, | |
1737 | * but it is not exported, so use lookup inode function | |
1738 | * to access it. | |
1739 | */ | |
1740 | while (!list_empty(&session->s_caps)) { | |
1741 | cap = list_entry(session->s_caps.next, | |
1742 | struct ceph_cap, session_caps); | |
1743 | if (cap == prev) | |
1744 | break; | |
1745 | prev = cap; | |
1746 | vino = cap->ci->i_vino; | |
1747 | spin_unlock(&session->s_cap_lock); | |
1748 | ||
ed284c49 | 1749 | inode = ceph_find_inode(sb, vino); |
23c2c76e | 1750 | iput(inode); |
6f60f889 YZ |
1751 | |
1752 | spin_lock(&session->s_cap_lock); | |
1753 | } | |
1754 | } | |
745a8e3b YZ |
1755 | |
1756 | // drop cap expires and unlock s_cap_lock | |
c8a96a31 | 1757 | detach_cap_releases(session, &dispose); |
6f60f889 | 1758 | |
2f2dc053 | 1759 | BUG_ON(session->s_nr_caps > 0); |
6c99f254 | 1760 | BUG_ON(!list_empty(&session->s_cap_flushing)); |
c8a96a31 JL |
1761 | spin_unlock(&session->s_cap_lock); |
1762 | dispose_cap_releases(session->s_mdsc, &dispose); | |
2f2dc053 SW |
1763 | } |
1764 | ||
d2f8bb27 YZ |
1765 | enum { |
1766 | RECONNECT, | |
1767 | RENEWCAPS, | |
1768 | FORCE_RO, | |
1769 | }; | |
1770 | ||
2f2dc053 SW |
1771 | /* |
1772 | * wake up any threads waiting on this session's caps. if the cap is | |
1773 | * old (didn't get renewed on the client reconnect), remove it now. | |
1774 | * | |
1775 | * caller must hold s_mutex. | |
1776 | */ | |
1777 | static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap, | |
1778 | void *arg) | |
1779 | { | |
0dc2570f | 1780 | struct ceph_inode_info *ci = ceph_inode(inode); |
d2f8bb27 | 1781 | unsigned long ev = (unsigned long)arg; |
0dc2570f | 1782 | |
d2f8bb27 | 1783 | if (ev == RECONNECT) { |
be655596 | 1784 | spin_lock(&ci->i_ceph_lock); |
0dc2570f SW |
1785 | ci->i_wanted_max_size = 0; |
1786 | ci->i_requested_max_size = 0; | |
be655596 | 1787 | spin_unlock(&ci->i_ceph_lock); |
d2f8bb27 | 1788 | } else if (ev == RENEWCAPS) { |
52d60f8e | 1789 | if (cap->cap_gen < atomic_read(&cap->session->s_cap_gen)) { |
d2f8bb27 YZ |
1790 | /* mds did not re-issue stale cap */ |
1791 | spin_lock(&ci->i_ceph_lock); | |
1792 | cap->issued = cap->implemented = CEPH_CAP_PIN; | |
d2f8bb27 YZ |
1793 | spin_unlock(&ci->i_ceph_lock); |
1794 | } | |
1795 | } else if (ev == FORCE_RO) { | |
0dc2570f | 1796 | } |
e5360309 | 1797 | wake_up_all(&ci->i_cap_wq); |
2f2dc053 SW |
1798 | return 0; |
1799 | } | |
1800 | ||
d2f8bb27 | 1801 | static void wake_up_session_caps(struct ceph_mds_session *session, int ev) |
2f2dc053 SW |
1802 | { |
1803 | dout("wake_up_session_caps %p mds%d\n", session, session->s_mds); | |
f5d77269 JL |
1804 | ceph_iterate_session_caps(session, wake_up_session_cb, |
1805 | (void *)(unsigned long)ev); | |
2f2dc053 SW |
1806 | } |
1807 | ||
1808 | /* | |
1809 | * Send periodic message to MDS renewing all currently held caps. The | |
1810 | * ack will reset the expiration for all caps from this session. | |
1811 | * | |
1812 | * caller holds s_mutex | |
1813 | */ | |
1814 | static int send_renew_caps(struct ceph_mds_client *mdsc, | |
1815 | struct ceph_mds_session *session) | |
1816 | { | |
1817 | struct ceph_msg *msg; | |
1818 | int state; | |
1819 | ||
1820 | if (time_after_eq(jiffies, session->s_cap_ttl) && | |
1821 | time_after_eq(session->s_cap_ttl, session->s_renew_requested)) | |
1822 | pr_info("mds%d caps stale\n", session->s_mds); | |
e4cb4cb8 | 1823 | session->s_renew_requested = jiffies; |
2f2dc053 SW |
1824 | |
1825 | /* do not try to renew caps until a recovering mds has reconnected | |
1826 | * with its clients. */ | |
1827 | state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds); | |
1828 | if (state < CEPH_MDS_STATE_RECONNECT) { | |
1829 | dout("send_renew_caps ignoring mds%d (%s)\n", | |
1830 | session->s_mds, ceph_mds_state_name(state)); | |
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | dout("send_renew_caps to mds%d (%s)\n", session->s_mds, | |
1835 | ceph_mds_state_name(state)); | |
fba97e80 XL |
1836 | msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS, |
1837 | ++session->s_renew_seq); | |
a79832f2 SW |
1838 | if (!msg) |
1839 | return -ENOMEM; | |
2f2dc053 SW |
1840 | ceph_con_send(&session->s_con, msg); |
1841 | return 0; | |
1842 | } | |
1843 | ||
186e4f7a YZ |
1844 | static int send_flushmsg_ack(struct ceph_mds_client *mdsc, |
1845 | struct ceph_mds_session *session, u64 seq) | |
1846 | { | |
1847 | struct ceph_msg *msg; | |
1848 | ||
1849 | dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n", | |
a687ecaf | 1850 | session->s_mds, ceph_session_state_name(session->s_state), seq); |
fba97e80 | 1851 | msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq); |
186e4f7a YZ |
1852 | if (!msg) |
1853 | return -ENOMEM; | |
1854 | ceph_con_send(&session->s_con, msg); | |
1855 | return 0; | |
1856 | } | |
1857 | ||
1858 | ||
2f2dc053 SW |
1859 | /* |
1860 | * Note new cap ttl, and any transition from stale -> not stale (fresh?). | |
0dc2570f SW |
1861 | * |
1862 | * Called under session->s_mutex | |
2f2dc053 SW |
1863 | */ |
1864 | static void renewed_caps(struct ceph_mds_client *mdsc, | |
1865 | struct ceph_mds_session *session, int is_renew) | |
1866 | { | |
1867 | int was_stale; | |
1868 | int wake = 0; | |
1869 | ||
1870 | spin_lock(&session->s_cap_lock); | |
1ce208a6 | 1871 | was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl); |
2f2dc053 SW |
1872 | |
1873 | session->s_cap_ttl = session->s_renew_requested + | |
1874 | mdsc->mdsmap->m_session_timeout*HZ; | |
1875 | ||
1876 | if (was_stale) { | |
1877 | if (time_before(jiffies, session->s_cap_ttl)) { | |
1878 | pr_info("mds%d caps renewed\n", session->s_mds); | |
1879 | wake = 1; | |
1880 | } else { | |
1881 | pr_info("mds%d caps still stale\n", session->s_mds); | |
1882 | } | |
1883 | } | |
1884 | dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n", | |
1885 | session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh", | |
1886 | time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh"); | |
1887 | spin_unlock(&session->s_cap_lock); | |
1888 | ||
1889 | if (wake) | |
d2f8bb27 | 1890 | wake_up_session_caps(session, RENEWCAPS); |
2f2dc053 SW |
1891 | } |
1892 | ||
1893 | /* | |
1894 | * send a session close request | |
1895 | */ | |
3e699bd8 | 1896 | static int request_close_session(struct ceph_mds_session *session) |
2f2dc053 SW |
1897 | { |
1898 | struct ceph_msg *msg; | |
2f2dc053 SW |
1899 | |
1900 | dout("request_close_session mds%d state %s seq %lld\n", | |
a687ecaf | 1901 | session->s_mds, ceph_session_state_name(session->s_state), |
2f2dc053 | 1902 | session->s_seq); |
fba97e80 XL |
1903 | msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE, |
1904 | session->s_seq); | |
a79832f2 SW |
1905 | if (!msg) |
1906 | return -ENOMEM; | |
1907 | ceph_con_send(&session->s_con, msg); | |
fcff415c | 1908 | return 1; |
2f2dc053 SW |
1909 | } |
1910 | ||
1911 | /* | |
1912 | * Called with s_mutex held. | |
1913 | */ | |
1914 | static int __close_session(struct ceph_mds_client *mdsc, | |
1915 | struct ceph_mds_session *session) | |
1916 | { | |
1917 | if (session->s_state >= CEPH_MDS_SESSION_CLOSING) | |
1918 | return 0; | |
1919 | session->s_state = CEPH_MDS_SESSION_CLOSING; | |
3e699bd8 | 1920 | return request_close_session(session); |
2f2dc053 SW |
1921 | } |
1922 | ||
040d7860 YZ |
1923 | static bool drop_negative_children(struct dentry *dentry) |
1924 | { | |
1925 | struct dentry *child; | |
1926 | bool all_negative = true; | |
1927 | ||
1928 | if (!d_is_dir(dentry)) | |
1929 | goto out; | |
1930 | ||
1931 | spin_lock(&dentry->d_lock); | |
1932 | list_for_each_entry(child, &dentry->d_subdirs, d_child) { | |
1933 | if (d_really_is_positive(child)) { | |
1934 | all_negative = false; | |
1935 | break; | |
1936 | } | |
1937 | } | |
1938 | spin_unlock(&dentry->d_lock); | |
1939 | ||
1940 | if (all_negative) | |
1941 | shrink_dcache_parent(dentry); | |
1942 | out: | |
1943 | return all_negative; | |
1944 | } | |
1945 | ||
2f2dc053 SW |
1946 | /* |
1947 | * Trim old(er) caps. | |
1948 | * | |
1949 | * Because we can't cache an inode without one or more caps, we do | |
1950 | * this indirectly: if a cap is unused, we prune its aliases, at which | |
1951 | * point the inode will hopefully get dropped to. | |
1952 | * | |
1953 | * Yes, this is a bit sloppy. Our only real goal here is to respond to | |
1954 | * memory pressure from the MDS, though, so it needn't be perfect. | |
1955 | */ | |
1956 | static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg) | |
1957 | { | |
533a2818 | 1958 | int *remaining = arg; |
2f2dc053 | 1959 | struct ceph_inode_info *ci = ceph_inode(inode); |
979abfdd | 1960 | int used, wanted, oissued, mine; |
2f2dc053 | 1961 | |
533a2818 | 1962 | if (*remaining <= 0) |
2f2dc053 SW |
1963 | return -1; |
1964 | ||
be655596 | 1965 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
1966 | mine = cap->issued | cap->implemented; |
1967 | used = __ceph_caps_used(ci); | |
979abfdd | 1968 | wanted = __ceph_caps_file_wanted(ci); |
2f2dc053 SW |
1969 | oissued = __ceph_caps_issued_other(ci, cap); |
1970 | ||
979abfdd | 1971 | dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n", |
2f2dc053 | 1972 | inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued), |
979abfdd YZ |
1973 | ceph_cap_string(used), ceph_cap_string(wanted)); |
1974 | if (cap == ci->i_auth_cap) { | |
622f3e25 YZ |
1975 | if (ci->i_dirty_caps || ci->i_flushing_caps || |
1976 | !list_empty(&ci->i_cap_snaps)) | |
979abfdd YZ |
1977 | goto out; |
1978 | if ((used | wanted) & CEPH_CAP_ANY_WR) | |
1979 | goto out; | |
89aa5930 YZ |
1980 | /* Note: it's possible that i_filelock_ref becomes non-zero |
1981 | * after dropping auth caps. It doesn't hurt because reply | |
1982 | * of lock mds request will re-add auth caps. */ | |
1983 | if (atomic_read(&ci->i_filelock_ref) > 0) | |
1984 | goto out; | |
979abfdd | 1985 | } |
5e804ac4 YZ |
1986 | /* The inode has cached pages, but it's no longer used. |
1987 | * we can safely drop it */ | |
525d15e8 YZ |
1988 | if (S_ISREG(inode->i_mode) && |
1989 | wanted == 0 && used == CEPH_CAP_FILE_CACHE && | |
5e804ac4 YZ |
1990 | !(oissued & CEPH_CAP_FILE_CACHE)) { |
1991 | used = 0; | |
1992 | oissued = 0; | |
1993 | } | |
979abfdd | 1994 | if ((used | wanted) & ~oissued & mine) |
2f2dc053 SW |
1995 | goto out; /* we need these caps */ |
1996 | ||
2f2dc053 SW |
1997 | if (oissued) { |
1998 | /* we aren't the only cap.. just remove us */ | |
a76d0a9c | 1999 | ceph_remove_cap(cap, true); |
533a2818 | 2000 | (*remaining)--; |
2f2dc053 | 2001 | } else { |
040d7860 | 2002 | struct dentry *dentry; |
5e804ac4 | 2003 | /* try dropping referring dentries */ |
be655596 | 2004 | spin_unlock(&ci->i_ceph_lock); |
040d7860 YZ |
2005 | dentry = d_find_any_alias(inode); |
2006 | if (dentry && drop_negative_children(dentry)) { | |
2007 | int count; | |
2008 | dput(dentry); | |
2009 | d_prune_aliases(inode); | |
2010 | count = atomic_read(&inode->i_count); | |
2011 | if (count == 1) | |
533a2818 | 2012 | (*remaining)--; |
040d7860 YZ |
2013 | dout("trim_caps_cb %p cap %p pruned, count now %d\n", |
2014 | inode, cap, count); | |
2015 | } else { | |
2016 | dput(dentry); | |
2017 | } | |
2f2dc053 SW |
2018 | return 0; |
2019 | } | |
2020 | ||
2021 | out: | |
be655596 | 2022 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 SW |
2023 | return 0; |
2024 | } | |
2025 | ||
2026 | /* | |
2027 | * Trim session cap count down to some max number. | |
2028 | */ | |
e30ee581 ZZ |
2029 | int ceph_trim_caps(struct ceph_mds_client *mdsc, |
2030 | struct ceph_mds_session *session, | |
2031 | int max_caps) | |
2f2dc053 SW |
2032 | { |
2033 | int trim_caps = session->s_nr_caps - max_caps; | |
2034 | ||
2035 | dout("trim_caps mds%d start: %d / %d, trim %d\n", | |
2036 | session->s_mds, session->s_nr_caps, max_caps, trim_caps); | |
2037 | if (trim_caps > 0) { | |
533a2818 JL |
2038 | int remaining = trim_caps; |
2039 | ||
2040 | ceph_iterate_session_caps(session, trim_caps_cb, &remaining); | |
2f2dc053 SW |
2041 | dout("trim_caps mds%d done: %d / %d, trimmed %d\n", |
2042 | session->s_mds, session->s_nr_caps, max_caps, | |
533a2818 | 2043 | trim_caps - remaining); |
2f2dc053 | 2044 | } |
a56371d9 | 2045 | |
e3ec8d68 | 2046 | ceph_flush_cap_releases(mdsc, session); |
2f2dc053 SW |
2047 | return 0; |
2048 | } | |
2049 | ||
8310b089 YZ |
2050 | static int check_caps_flush(struct ceph_mds_client *mdsc, |
2051 | u64 want_flush_tid) | |
2052 | { | |
8310b089 YZ |
2053 | int ret = 1; |
2054 | ||
2055 | spin_lock(&mdsc->cap_dirty_lock); | |
e4500b5e YZ |
2056 | if (!list_empty(&mdsc->cap_flush_list)) { |
2057 | struct ceph_cap_flush *cf = | |
2058 | list_first_entry(&mdsc->cap_flush_list, | |
2059 | struct ceph_cap_flush, g_list); | |
2060 | if (cf->tid <= want_flush_tid) { | |
2061 | dout("check_caps_flush still flushing tid " | |
2062 | "%llu <= %llu\n", cf->tid, want_flush_tid); | |
2063 | ret = 0; | |
2064 | } | |
8310b089 YZ |
2065 | } |
2066 | spin_unlock(&mdsc->cap_dirty_lock); | |
2067 | return ret; | |
d3383a8e YZ |
2068 | } |
2069 | ||
2f2dc053 SW |
2070 | /* |
2071 | * flush all dirty inode data to disk. | |
2072 | * | |
8310b089 | 2073 | * returns true if we've flushed through want_flush_tid |
2f2dc053 | 2074 | */ |
affbc19a | 2075 | static void wait_caps_flush(struct ceph_mds_client *mdsc, |
0e294387 | 2076 | u64 want_flush_tid) |
2f2dc053 | 2077 | { |
0e294387 | 2078 | dout("check_caps_flush want %llu\n", want_flush_tid); |
8310b089 YZ |
2079 | |
2080 | wait_event(mdsc->cap_flushing_wq, | |
2081 | check_caps_flush(mdsc, want_flush_tid)); | |
2082 | ||
2083 | dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid); | |
2f2dc053 SW |
2084 | } |
2085 | ||
2086 | /* | |
2087 | * called under s_mutex | |
2088 | */ | |
e3ec8d68 YZ |
2089 | static void ceph_send_cap_releases(struct ceph_mds_client *mdsc, |
2090 | struct ceph_mds_session *session) | |
2f2dc053 | 2091 | { |
745a8e3b YZ |
2092 | struct ceph_msg *msg = NULL; |
2093 | struct ceph_mds_cap_release *head; | |
2094 | struct ceph_mds_cap_item *item; | |
92475f05 | 2095 | struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; |
745a8e3b YZ |
2096 | struct ceph_cap *cap; |
2097 | LIST_HEAD(tmp_list); | |
2098 | int num_cap_releases; | |
92475f05 JL |
2099 | __le32 barrier, *cap_barrier; |
2100 | ||
2101 | down_read(&osdc->lock); | |
2102 | barrier = cpu_to_le32(osdc->epoch_barrier); | |
2103 | up_read(&osdc->lock); | |
2f2dc053 | 2104 | |
0f8605f2 | 2105 | spin_lock(&session->s_cap_lock); |
745a8e3b YZ |
2106 | again: |
2107 | list_splice_init(&session->s_cap_releases, &tmp_list); | |
2108 | num_cap_releases = session->s_num_cap_releases; | |
2109 | session->s_num_cap_releases = 0; | |
2f2dc053 | 2110 | spin_unlock(&session->s_cap_lock); |
e01a5946 | 2111 | |
745a8e3b YZ |
2112 | while (!list_empty(&tmp_list)) { |
2113 | if (!msg) { | |
2114 | msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, | |
09cbfeaf | 2115 | PAGE_SIZE, GFP_NOFS, false); |
745a8e3b YZ |
2116 | if (!msg) |
2117 | goto out_err; | |
2118 | head = msg->front.iov_base; | |
2119 | head->num = cpu_to_le32(0); | |
2120 | msg->front.iov_len = sizeof(*head); | |
92475f05 JL |
2121 | |
2122 | msg->hdr.version = cpu_to_le16(2); | |
2123 | msg->hdr.compat_version = cpu_to_le16(1); | |
745a8e3b | 2124 | } |
92475f05 | 2125 | |
745a8e3b YZ |
2126 | cap = list_first_entry(&tmp_list, struct ceph_cap, |
2127 | session_caps); | |
2128 | list_del(&cap->session_caps); | |
2129 | num_cap_releases--; | |
e01a5946 | 2130 | |
00bd8edb | 2131 | head = msg->front.iov_base; |
4198aba4 JL |
2132 | put_unaligned_le32(get_unaligned_le32(&head->num) + 1, |
2133 | &head->num); | |
745a8e3b YZ |
2134 | item = msg->front.iov_base + msg->front.iov_len; |
2135 | item->ino = cpu_to_le64(cap->cap_ino); | |
2136 | item->cap_id = cpu_to_le64(cap->cap_id); | |
2137 | item->migrate_seq = cpu_to_le32(cap->mseq); | |
2138 | item->seq = cpu_to_le32(cap->issue_seq); | |
2139 | msg->front.iov_len += sizeof(*item); | |
2140 | ||
2141 | ceph_put_cap(mdsc, cap); | |
2142 | ||
2143 | if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) { | |
92475f05 JL |
2144 | // Append cap_barrier field |
2145 | cap_barrier = msg->front.iov_base + msg->front.iov_len; | |
2146 | *cap_barrier = barrier; | |
2147 | msg->front.iov_len += sizeof(*cap_barrier); | |
2148 | ||
745a8e3b YZ |
2149 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
2150 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
2151 | ceph_con_send(&session->s_con, msg); | |
2152 | msg = NULL; | |
2153 | } | |
00bd8edb | 2154 | } |
e01a5946 | 2155 | |
745a8e3b | 2156 | BUG_ON(num_cap_releases != 0); |
e01a5946 | 2157 | |
745a8e3b YZ |
2158 | spin_lock(&session->s_cap_lock); |
2159 | if (!list_empty(&session->s_cap_releases)) | |
2160 | goto again; | |
2161 | spin_unlock(&session->s_cap_lock); | |
2162 | ||
2163 | if (msg) { | |
92475f05 JL |
2164 | // Append cap_barrier field |
2165 | cap_barrier = msg->front.iov_base + msg->front.iov_len; | |
2166 | *cap_barrier = barrier; | |
2167 | msg->front.iov_len += sizeof(*cap_barrier); | |
2168 | ||
745a8e3b YZ |
2169 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); |
2170 | dout("send_cap_releases mds%d %p\n", session->s_mds, msg); | |
2171 | ceph_con_send(&session->s_con, msg); | |
e01a5946 | 2172 | } |
745a8e3b YZ |
2173 | return; |
2174 | out_err: | |
2175 | pr_err("send_cap_releases mds%d, failed to allocate message\n", | |
2176 | session->s_mds); | |
2177 | spin_lock(&session->s_cap_lock); | |
2178 | list_splice(&tmp_list, &session->s_cap_releases); | |
2179 | session->s_num_cap_releases += num_cap_releases; | |
2180 | spin_unlock(&session->s_cap_lock); | |
e01a5946 SW |
2181 | } |
2182 | ||
e3ec8d68 YZ |
2183 | static void ceph_cap_release_work(struct work_struct *work) |
2184 | { | |
2185 | struct ceph_mds_session *session = | |
2186 | container_of(work, struct ceph_mds_session, s_cap_release_work); | |
2187 | ||
2188 | mutex_lock(&session->s_mutex); | |
2189 | if (session->s_state == CEPH_MDS_SESSION_OPEN || | |
2190 | session->s_state == CEPH_MDS_SESSION_HUNG) | |
2191 | ceph_send_cap_releases(session->s_mdsc, session); | |
2192 | mutex_unlock(&session->s_mutex); | |
2193 | ceph_put_mds_session(session); | |
2194 | } | |
2195 | ||
2196 | void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, | |
2197 | struct ceph_mds_session *session) | |
2198 | { | |
2199 | if (mdsc->stopping) | |
2200 | return; | |
2201 | ||
5b3248c6 | 2202 | ceph_get_mds_session(session); |
e3ec8d68 YZ |
2203 | if (queue_work(mdsc->fsc->cap_wq, |
2204 | &session->s_cap_release_work)) { | |
2205 | dout("cap release work queued\n"); | |
2206 | } else { | |
2207 | ceph_put_mds_session(session); | |
2208 | dout("failed to queue cap release work\n"); | |
2209 | } | |
2210 | } | |
2211 | ||
2212 | /* | |
2213 | * caller holds session->s_cap_lock | |
2214 | */ | |
2215 | void __ceph_queue_cap_release(struct ceph_mds_session *session, | |
2216 | struct ceph_cap *cap) | |
2217 | { | |
2218 | list_add_tail(&cap->session_caps, &session->s_cap_releases); | |
2219 | session->s_num_cap_releases++; | |
2220 | ||
2221 | if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE)) | |
2222 | ceph_flush_cap_releases(session->s_mdsc, session); | |
2223 | } | |
2224 | ||
37c4efc1 YZ |
2225 | static void ceph_cap_reclaim_work(struct work_struct *work) |
2226 | { | |
2227 | struct ceph_mds_client *mdsc = | |
2228 | container_of(work, struct ceph_mds_client, cap_reclaim_work); | |
2229 | int ret = ceph_trim_dentries(mdsc); | |
2230 | if (ret == -EAGAIN) | |
2231 | ceph_queue_cap_reclaim_work(mdsc); | |
2232 | } | |
2233 | ||
2234 | void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc) | |
2235 | { | |
2236 | if (mdsc->stopping) | |
2237 | return; | |
2238 | ||
2239 | if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) { | |
2240 | dout("caps reclaim work queued\n"); | |
2241 | } else { | |
2242 | dout("failed to queue caps release work\n"); | |
2243 | } | |
2244 | } | |
2245 | ||
fe33032d YZ |
2246 | void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr) |
2247 | { | |
2248 | int val; | |
2249 | if (!nr) | |
2250 | return; | |
2251 | val = atomic_add_return(nr, &mdsc->cap_reclaim_pending); | |
bba1560b | 2252 | if ((val % CEPH_CAPS_PER_RELEASE) < nr) { |
fe33032d YZ |
2253 | atomic_set(&mdsc->cap_reclaim_pending, 0); |
2254 | ceph_queue_cap_reclaim_work(mdsc); | |
2255 | } | |
2256 | } | |
2257 | ||
2f2dc053 SW |
2258 | /* |
2259 | * requests | |
2260 | */ | |
2261 | ||
54008399 YZ |
2262 | int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
2263 | struct inode *dir) | |
2264 | { | |
2265 | struct ceph_inode_info *ci = ceph_inode(dir); | |
2266 | struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; | |
2267 | struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options; | |
2a5beea3 | 2268 | size_t size = sizeof(struct ceph_mds_reply_dir_entry); |
ad8c28a9 JL |
2269 | unsigned int num_entries; |
2270 | int order; | |
54008399 YZ |
2271 | |
2272 | spin_lock(&ci->i_ceph_lock); | |
2273 | num_entries = ci->i_files + ci->i_subdirs; | |
2274 | spin_unlock(&ci->i_ceph_lock); | |
ad8c28a9 | 2275 | num_entries = max(num_entries, 1U); |
54008399 YZ |
2276 | num_entries = min(num_entries, opt->max_readdir); |
2277 | ||
2278 | order = get_order(size * num_entries); | |
2279 | while (order >= 0) { | |
2a5beea3 | 2280 | rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL | |
2941bf53 XL |
2281 | __GFP_NOWARN | |
2282 | __GFP_ZERO, | |
2a5beea3 YZ |
2283 | order); |
2284 | if (rinfo->dir_entries) | |
54008399 YZ |
2285 | break; |
2286 | order--; | |
2287 | } | |
2a5beea3 | 2288 | if (!rinfo->dir_entries) |
54008399 YZ |
2289 | return -ENOMEM; |
2290 | ||
2291 | num_entries = (PAGE_SIZE << order) / size; | |
2292 | num_entries = min(num_entries, opt->max_readdir); | |
2293 | ||
2294 | rinfo->dir_buf_size = PAGE_SIZE << order; | |
2295 | req->r_num_caps = num_entries + 1; | |
2296 | req->r_args.readdir.max_entries = cpu_to_le32(num_entries); | |
2297 | req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes); | |
2298 | return 0; | |
2299 | } | |
2300 | ||
2f2dc053 SW |
2301 | /* |
2302 | * Create an mds request. | |
2303 | */ | |
2304 | struct ceph_mds_request * | |
2305 | ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode) | |
2306 | { | |
058daab7 | 2307 | struct ceph_mds_request *req; |
2f2dc053 | 2308 | |
058daab7 | 2309 | req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS); |
2f2dc053 SW |
2310 | if (!req) |
2311 | return ERR_PTR(-ENOMEM); | |
2312 | ||
b4556396 | 2313 | mutex_init(&req->r_fill_mutex); |
37151668 | 2314 | req->r_mdsc = mdsc; |
2f2dc053 | 2315 | req->r_started = jiffies; |
70c94820 | 2316 | req->r_start_latency = ktime_get(); |
2f2dc053 SW |
2317 | req->r_resend_mds = -1; |
2318 | INIT_LIST_HEAD(&req->r_unsafe_dir_item); | |
68cd5b4b | 2319 | INIT_LIST_HEAD(&req->r_unsafe_target_item); |
2f2dc053 | 2320 | req->r_fmode = -1; |
153c8e6b | 2321 | kref_init(&req->r_kref); |
fcd00b68 | 2322 | RB_CLEAR_NODE(&req->r_node); |
2f2dc053 SW |
2323 | INIT_LIST_HEAD(&req->r_wait); |
2324 | init_completion(&req->r_completion); | |
2325 | init_completion(&req->r_safe_completion); | |
2326 | INIT_LIST_HEAD(&req->r_unsafe_item); | |
2327 | ||
668c9a61 | 2328 | ktime_get_coarse_real_ts64(&req->r_stamp); |
b8e69066 | 2329 | |
2f2dc053 SW |
2330 | req->r_op = op; |
2331 | req->r_direct_mode = mode; | |
2332 | return req; | |
2333 | } | |
2334 | ||
2335 | /* | |
44ca18f2 | 2336 | * return oldest (lowest) request, tid in request tree, 0 if none. |
2f2dc053 SW |
2337 | * |
2338 | * called under mdsc->mutex. | |
2339 | */ | |
44ca18f2 SW |
2340 | static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc) |
2341 | { | |
2342 | if (RB_EMPTY_ROOT(&mdsc->request_tree)) | |
2343 | return NULL; | |
2344 | return rb_entry(rb_first(&mdsc->request_tree), | |
2345 | struct ceph_mds_request, r_node); | |
2346 | } | |
2347 | ||
e8a7b8b1 | 2348 | static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) |
2f2dc053 | 2349 | { |
e8a7b8b1 | 2350 | return mdsc->oldest_tid; |
2f2dc053 SW |
2351 | } |
2352 | ||
2353 | /* | |
2354 | * Build a dentry's path. Allocate on heap; caller must kfree. Based | |
2355 | * on build_path_from_dentry in fs/cifs/dir.c. | |
2356 | * | |
2357 | * If @stop_on_nosnap, generate path relative to the first non-snapped | |
2358 | * inode. | |
2359 | * | |
2360 | * Encode hidden .snap dirs as a double /, i.e. | |
2361 | * foo/.snap/bar -> foo//bar | |
2362 | */ | |
69a10fb3 | 2363 | char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase, |
2f2dc053 SW |
2364 | int stop_on_nosnap) |
2365 | { | |
2366 | struct dentry *temp; | |
2367 | char *path; | |
f77f21bb | 2368 | int pos; |
1b71fe2e | 2369 | unsigned seq; |
69a10fb3 | 2370 | u64 base; |
2f2dc053 | 2371 | |
d37b1d99 | 2372 | if (!dentry) |
2f2dc053 SW |
2373 | return ERR_PTR(-EINVAL); |
2374 | ||
f77f21bb | 2375 | path = __getname(); |
d37b1d99 | 2376 | if (!path) |
2f2dc053 | 2377 | return ERR_PTR(-ENOMEM); |
f77f21bb JL |
2378 | retry: |
2379 | pos = PATH_MAX - 1; | |
2380 | path[pos] = '\0'; | |
2381 | ||
2382 | seq = read_seqbegin(&rename_lock); | |
1b71fe2e | 2383 | rcu_read_lock(); |
f77f21bb JL |
2384 | temp = dentry; |
2385 | for (;;) { | |
1b71fe2e | 2386 | struct inode *inode; |
2f2dc053 | 2387 | |
1b71fe2e | 2388 | spin_lock(&temp->d_lock); |
2b0143b5 | 2389 | inode = d_inode(temp); |
2f2dc053 | 2390 | if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
104648ad | 2391 | dout("build_path path+%d: %p SNAPDIR\n", |
2f2dc053 | 2392 | pos, temp); |
d6b8bd67 | 2393 | } else if (stop_on_nosnap && inode && dentry != temp && |
2f2dc053 | 2394 | ceph_snap(inode) == CEPH_NOSNAP) { |
9d5a09e6 | 2395 | spin_unlock(&temp->d_lock); |
d6b8bd67 | 2396 | pos++; /* get rid of any prepended '/' */ |
2f2dc053 SW |
2397 | break; |
2398 | } else { | |
2399 | pos -= temp->d_name.len; | |
1b71fe2e AV |
2400 | if (pos < 0) { |
2401 | spin_unlock(&temp->d_lock); | |
2f2dc053 | 2402 | break; |
1b71fe2e | 2403 | } |
f77f21bb | 2404 | memcpy(path + pos, temp->d_name.name, temp->d_name.len); |
2f2dc053 | 2405 | } |
1b71fe2e | 2406 | spin_unlock(&temp->d_lock); |
41883ba8 | 2407 | temp = READ_ONCE(temp->d_parent); |
f77f21bb JL |
2408 | |
2409 | /* Are we at the root? */ | |
2410 | if (IS_ROOT(temp)) | |
2411 | break; | |
2412 | ||
2413 | /* Are we out of buffer? */ | |
2414 | if (--pos < 0) | |
2415 | break; | |
2416 | ||
2417 | path[pos] = '/'; | |
2f2dc053 | 2418 | } |
69a10fb3 | 2419 | base = ceph_ino(d_inode(temp)); |
1b71fe2e | 2420 | rcu_read_unlock(); |
f5946bcc JL |
2421 | |
2422 | if (read_seqretry(&rename_lock, seq)) | |
2423 | goto retry; | |
2424 | ||
2425 | if (pos < 0) { | |
2426 | /* | |
2427 | * A rename didn't occur, but somehow we didn't end up where | |
2428 | * we thought we would. Throw a warning and try again. | |
2429 | */ | |
2430 | pr_warn("build_path did not end path lookup where " | |
2431 | "expected, pos is %d\n", pos); | |
2f2dc053 SW |
2432 | goto retry; |
2433 | } | |
2434 | ||
69a10fb3 | 2435 | *pbase = base; |
f77f21bb | 2436 | *plen = PATH_MAX - 1 - pos; |
104648ad | 2437 | dout("build_path on %p %d built %llx '%.*s'\n", |
f77f21bb JL |
2438 | dentry, d_count(dentry), base, *plen, path + pos); |
2439 | return path + pos; | |
2f2dc053 SW |
2440 | } |
2441 | ||
fd36a717 | 2442 | static int build_dentry_path(struct dentry *dentry, struct inode *dir, |
2f2dc053 | 2443 | const char **ppath, int *ppathlen, u64 *pino, |
1bcb3440 | 2444 | bool *pfreepath, bool parent_locked) |
2f2dc053 SW |
2445 | { |
2446 | char *path; | |
2447 | ||
c6b0b656 | 2448 | rcu_read_lock(); |
fd36a717 JL |
2449 | if (!dir) |
2450 | dir = d_inode_rcu(dentry->d_parent); | |
964fff74 | 2451 | if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) { |
c6b0b656 JL |
2452 | *pino = ceph_ino(dir); |
2453 | rcu_read_unlock(); | |
964fff74 JL |
2454 | *ppath = dentry->d_name.name; |
2455 | *ppathlen = dentry->d_name.len; | |
2f2dc053 SW |
2456 | return 0; |
2457 | } | |
c6b0b656 | 2458 | rcu_read_unlock(); |
2f2dc053 SW |
2459 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); |
2460 | if (IS_ERR(path)) | |
2461 | return PTR_ERR(path); | |
2462 | *ppath = path; | |
1bcb3440 | 2463 | *pfreepath = true; |
2f2dc053 SW |
2464 | return 0; |
2465 | } | |
2466 | ||
2467 | static int build_inode_path(struct inode *inode, | |
2468 | const char **ppath, int *ppathlen, u64 *pino, | |
1bcb3440 | 2469 | bool *pfreepath) |
2f2dc053 SW |
2470 | { |
2471 | struct dentry *dentry; | |
2472 | char *path; | |
2473 | ||
2474 | if (ceph_snap(inode) == CEPH_NOSNAP) { | |
2475 | *pino = ceph_ino(inode); | |
2476 | *ppathlen = 0; | |
2477 | return 0; | |
2478 | } | |
2479 | dentry = d_find_alias(inode); | |
2480 | path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1); | |
2481 | dput(dentry); | |
2482 | if (IS_ERR(path)) | |
2483 | return PTR_ERR(path); | |
2484 | *ppath = path; | |
1bcb3440 | 2485 | *pfreepath = true; |
2f2dc053 SW |
2486 | return 0; |
2487 | } | |
2488 | ||
2489 | /* | |
2490 | * request arguments may be specified via an inode *, a dentry *, or | |
2491 | * an explicit ino+path. | |
2492 | */ | |
2493 | static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry, | |
fd36a717 JL |
2494 | struct inode *rdiri, const char *rpath, |
2495 | u64 rino, const char **ppath, int *pathlen, | |
1bcb3440 | 2496 | u64 *ino, bool *freepath, bool parent_locked) |
2f2dc053 SW |
2497 | { |
2498 | int r = 0; | |
2499 | ||
2500 | if (rinode) { | |
2501 | r = build_inode_path(rinode, ppath, pathlen, ino, freepath); | |
2502 | dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode), | |
2503 | ceph_snap(rinode)); | |
2504 | } else if (rdentry) { | |
fd36a717 | 2505 | r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino, |
1bcb3440 | 2506 | freepath, parent_locked); |
2f2dc053 SW |
2507 | dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, |
2508 | *ppath); | |
795858db | 2509 | } else if (rpath || rino) { |
2f2dc053 SW |
2510 | *ino = rino; |
2511 | *ppath = rpath; | |
b000056a | 2512 | *pathlen = rpath ? strlen(rpath) : 0; |
2f2dc053 SW |
2513 | dout(" path %.*s\n", *pathlen, rpath); |
2514 | } | |
2515 | ||
2516 | return r; | |
2517 | } | |
2518 | ||
60267ba3 ID |
2519 | static void encode_timestamp_and_gids(void **p, |
2520 | const struct ceph_mds_request *req) | |
2521 | { | |
2522 | struct ceph_timespec ts; | |
2523 | int i; | |
2524 | ||
2525 | ceph_encode_timespec64(&ts, &req->r_stamp); | |
2526 | ceph_encode_copy(p, &ts, sizeof(ts)); | |
2527 | ||
2528 | /* gid_list */ | |
2529 | ceph_encode_32(p, req->r_cred->group_info->ngroups); | |
2530 | for (i = 0; i < req->r_cred->group_info->ngroups; i++) | |
2531 | ceph_encode_64(p, from_kgid(&init_user_ns, | |
2532 | req->r_cred->group_info->gid[i])); | |
2533 | } | |
2534 | ||
2f2dc053 SW |
2535 | /* |
2536 | * called under mdsc->mutex | |
2537 | */ | |
4f1ddb1e | 2538 | static struct ceph_msg *create_request_message(struct ceph_mds_session *session, |
2f2dc053 | 2539 | struct ceph_mds_request *req, |
4f1ddb1e | 2540 | bool drop_cap_releases) |
2f2dc053 | 2541 | { |
4f1ddb1e JL |
2542 | int mds = session->s_mds; |
2543 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
2f2dc053 | 2544 | struct ceph_msg *msg; |
4f1ddb1e | 2545 | struct ceph_mds_request_head_old *head; |
2f2dc053 SW |
2546 | const char *path1 = NULL; |
2547 | const char *path2 = NULL; | |
2548 | u64 ino1 = 0, ino2 = 0; | |
2549 | int pathlen1 = 0, pathlen2 = 0; | |
1bcb3440 | 2550 | bool freepath1 = false, freepath2 = false; |
60267ba3 | 2551 | int len; |
2f2dc053 SW |
2552 | u16 releases; |
2553 | void *p, *end; | |
2554 | int ret; | |
4f1ddb1e | 2555 | bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME); |
2f2dc053 SW |
2556 | |
2557 | ret = set_request_path_attr(req->r_inode, req->r_dentry, | |
3dd69aab | 2558 | req->r_parent, req->r_path1, req->r_ino1.ino, |
1bcb3440 JL |
2559 | &path1, &pathlen1, &ino1, &freepath1, |
2560 | test_bit(CEPH_MDS_R_PARENT_LOCKED, | |
2561 | &req->r_req_flags)); | |
2f2dc053 SW |
2562 | if (ret < 0) { |
2563 | msg = ERR_PTR(ret); | |
2564 | goto out; | |
2565 | } | |
2566 | ||
1bcb3440 | 2567 | /* If r_old_dentry is set, then assume that its parent is locked */ |
2f2dc053 | 2568 | ret = set_request_path_attr(NULL, req->r_old_dentry, |
fd36a717 | 2569 | req->r_old_dentry_dir, |
2f2dc053 | 2570 | req->r_path2, req->r_ino2.ino, |
1bcb3440 | 2571 | &path2, &pathlen2, &ino2, &freepath2, true); |
2f2dc053 SW |
2572 | if (ret < 0) { |
2573 | msg = ERR_PTR(ret); | |
2574 | goto out_free1; | |
2575 | } | |
2576 | ||
60267ba3 | 2577 | len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head); |
4f1ddb1e | 2578 | len += pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) + |
777d738a | 2579 | sizeof(struct ceph_timespec); |
60267ba3 | 2580 | len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups); |
2f2dc053 SW |
2581 | |
2582 | /* calculate (max) length for cap releases */ | |
2583 | len += sizeof(struct ceph_mds_request_release) * | |
2584 | (!!req->r_inode_drop + !!req->r_dentry_drop + | |
2585 | !!req->r_old_inode_drop + !!req->r_old_dentry_drop); | |
4f1ddb1e | 2586 | |
2f2dc053 | 2587 | if (req->r_dentry_drop) |
c1dfc277 | 2588 | len += pathlen1; |
2f2dc053 | 2589 | if (req->r_old_dentry_drop) |
c1dfc277 | 2590 | len += pathlen2; |
2f2dc053 | 2591 | |
0d9c1ab3 | 2592 | msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false); |
a79832f2 SW |
2593 | if (!msg) { |
2594 | msg = ERR_PTR(-ENOMEM); | |
2f2dc053 | 2595 | goto out_free2; |
a79832f2 | 2596 | } |
2f2dc053 | 2597 | |
6df058c0 SW |
2598 | msg->hdr.tid = cpu_to_le64(req->r_tid); |
2599 | ||
4f1ddb1e | 2600 | /* |
60267ba3 | 2601 | * The old ceph_mds_request_head didn't contain a version field, and |
4f1ddb1e JL |
2602 | * one was added when we moved the message version from 3->4. |
2603 | */ | |
2604 | if (legacy) { | |
2605 | msg->hdr.version = cpu_to_le16(3); | |
2606 | head = msg->front.iov_base; | |
2607 | p = msg->front.iov_base + sizeof(*head); | |
2608 | } else { | |
2609 | struct ceph_mds_request_head *new_head = msg->front.iov_base; | |
2610 | ||
2611 | msg->hdr.version = cpu_to_le16(4); | |
2612 | new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION); | |
2613 | head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid; | |
2614 | p = msg->front.iov_base + sizeof(*new_head); | |
2615 | } | |
2616 | ||
2f2dc053 SW |
2617 | end = msg->front.iov_base + msg->front.iov_len; |
2618 | ||
2619 | head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch); | |
2620 | head->op = cpu_to_le32(req->r_op); | |
7fe0cdeb JL |
2621 | head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, |
2622 | req->r_cred->fsuid)); | |
2623 | head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, | |
2624 | req->r_cred->fsgid)); | |
6deb8008 | 2625 | head->ino = cpu_to_le64(req->r_deleg_ino); |
2f2dc053 SW |
2626 | head->args = req->r_args; |
2627 | ||
2628 | ceph_encode_filepath(&p, end, ino1, path1); | |
2629 | ceph_encode_filepath(&p, end, ino2, path2); | |
2630 | ||
e979cf50 SW |
2631 | /* make note of release offset, in case we need to replay */ |
2632 | req->r_request_release_offset = p - msg->front.iov_base; | |
2633 | ||
2f2dc053 SW |
2634 | /* cap releases */ |
2635 | releases = 0; | |
2636 | if (req->r_inode_drop) | |
2637 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 2638 | req->r_inode ? req->r_inode : d_inode(req->r_dentry), |
719a2514 YZ |
2639 | mds, req->r_inode_drop, req->r_inode_unless, |
2640 | req->r_op == CEPH_MDS_OP_READDIR); | |
2f2dc053 SW |
2641 | if (req->r_dentry_drop) |
2642 | releases += ceph_encode_dentry_release(&p, req->r_dentry, | |
3dd69aab | 2643 | req->r_parent, mds, req->r_dentry_drop, |
ca6c8ae0 | 2644 | req->r_dentry_unless); |
2f2dc053 SW |
2645 | if (req->r_old_dentry_drop) |
2646 | releases += ceph_encode_dentry_release(&p, req->r_old_dentry, | |
ca6c8ae0 JL |
2647 | req->r_old_dentry_dir, mds, |
2648 | req->r_old_dentry_drop, | |
2649 | req->r_old_dentry_unless); | |
2f2dc053 SW |
2650 | if (req->r_old_inode_drop) |
2651 | releases += ceph_encode_inode_release(&p, | |
2b0143b5 | 2652 | d_inode(req->r_old_dentry), |
2f2dc053 | 2653 | mds, req->r_old_inode_drop, req->r_old_inode_unless, 0); |
6e6f0923 YZ |
2654 | |
2655 | if (drop_cap_releases) { | |
2656 | releases = 0; | |
2657 | p = msg->front.iov_base + req->r_request_release_offset; | |
2658 | } | |
2659 | ||
2f2dc053 SW |
2660 | head->num_releases = cpu_to_le16(releases); |
2661 | ||
60267ba3 | 2662 | encode_timestamp_and_gids(&p, req); |
4f1ddb1e | 2663 | |
b682c6d4 XL |
2664 | if (WARN_ON_ONCE(p > end)) { |
2665 | ceph_msg_put(msg); | |
2666 | msg = ERR_PTR(-ERANGE); | |
2667 | goto out_free2; | |
2668 | } | |
2669 | ||
2f2dc053 SW |
2670 | msg->front.iov_len = p - msg->front.iov_base; |
2671 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
2672 | ||
25e6bae3 YZ |
2673 | if (req->r_pagelist) { |
2674 | struct ceph_pagelist *pagelist = req->r_pagelist; | |
25e6bae3 YZ |
2675 | ceph_msg_data_add_pagelist(msg, pagelist); |
2676 | msg->hdr.data_len = cpu_to_le32(pagelist->length); | |
2677 | } else { | |
2678 | msg->hdr.data_len = 0; | |
ebf18f47 | 2679 | } |
02afca6c | 2680 | |
2f2dc053 SW |
2681 | msg->hdr.data_off = cpu_to_le16(0); |
2682 | ||
2683 | out_free2: | |
2684 | if (freepath2) | |
f77f21bb | 2685 | ceph_mdsc_free_path((char *)path2, pathlen2); |
2f2dc053 SW |
2686 | out_free1: |
2687 | if (freepath1) | |
f77f21bb | 2688 | ceph_mdsc_free_path((char *)path1, pathlen1); |
2f2dc053 SW |
2689 | out: |
2690 | return msg; | |
2691 | } | |
2692 | ||
2693 | /* | |
2694 | * called under mdsc->mutex if error, under no mutex if | |
2695 | * success. | |
2696 | */ | |
2697 | static void complete_request(struct ceph_mds_client *mdsc, | |
2698 | struct ceph_mds_request *req) | |
2699 | { | |
70c94820 XL |
2700 | req->r_end_latency = ktime_get(); |
2701 | ||
2f2dc053 SW |
2702 | if (req->r_callback) |
2703 | req->r_callback(mdsc, req); | |
111c7081 | 2704 | complete_all(&req->r_completion); |
2f2dc053 SW |
2705 | } |
2706 | ||
4f1ddb1e JL |
2707 | static struct ceph_mds_request_head_old * |
2708 | find_old_request_head(void *p, u64 features) | |
2709 | { | |
2710 | bool legacy = !(features & CEPH_FEATURE_FS_BTIME); | |
2711 | struct ceph_mds_request_head *new_head; | |
2712 | ||
2713 | if (legacy) | |
2714 | return (struct ceph_mds_request_head_old *)p; | |
2715 | new_head = (struct ceph_mds_request_head *)p; | |
2716 | return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid; | |
2717 | } | |
2718 | ||
2f2dc053 SW |
2719 | /* |
2720 | * called under mdsc->mutex | |
2721 | */ | |
396bd62c | 2722 | static int __prepare_send_request(struct ceph_mds_session *session, |
2f2dc053 | 2723 | struct ceph_mds_request *req, |
396bd62c | 2724 | bool drop_cap_releases) |
2f2dc053 | 2725 | { |
396bd62c JL |
2726 | int mds = session->s_mds; |
2727 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
4f1ddb1e | 2728 | struct ceph_mds_request_head_old *rhead; |
2f2dc053 | 2729 | struct ceph_msg *msg; |
546a5d61 XL |
2730 | int flags = 0, max_retry; |
2731 | ||
2732 | /* | |
2733 | * The type of 'r_attempts' in kernel 'ceph_mds_request' | |
2734 | * is 'int', while in 'ceph_mds_request_head' the type of | |
2735 | * 'num_retry' is '__u8'. So in case the request retries | |
2736 | * exceeding 256 times, the MDS will receive a incorrect | |
2737 | * retry seq. | |
2738 | * | |
2739 | * In this case it's ususally a bug in MDS and continue | |
2740 | * retrying the request makes no sense. | |
2741 | * | |
2742 | * In future this could be fixed in ceph code, so avoid | |
2743 | * using the hardcode here. | |
2744 | */ | |
2745 | max_retry = sizeof_field(struct ceph_mds_request_head, num_retry); | |
2746 | max_retry = 1 << (max_retry * BITS_PER_BYTE); | |
2747 | if (req->r_attempts >= max_retry) { | |
2748 | pr_warn_ratelimited("%s request tid %llu seq overflow\n", | |
2749 | __func__, req->r_tid); | |
2750 | return -EMULTIHOP; | |
2751 | } | |
2f2dc053 | 2752 | |
2f2dc053 | 2753 | req->r_attempts++; |
e55b71f8 GF |
2754 | if (req->r_inode) { |
2755 | struct ceph_cap *cap = | |
2756 | ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds); | |
2757 | ||
2758 | if (cap) | |
2759 | req->r_sent_on_mseq = cap->mseq; | |
2760 | else | |
2761 | req->r_sent_on_mseq = -1; | |
2762 | } | |
546a5d61 | 2763 | dout("%s %p tid %lld %s (attempt %d)\n", __func__, req, |
2f2dc053 SW |
2764 | req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts); |
2765 | ||
bc2de10d | 2766 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { |
c5c9a0bf | 2767 | void *p; |
4f1ddb1e | 2768 | |
01a92f17 SW |
2769 | /* |
2770 | * Replay. Do not regenerate message (and rebuild | |
2771 | * paths, etc.); just use the original message. | |
2772 | * Rebuilding paths will break for renames because | |
2773 | * d_move mangles the src name. | |
2774 | */ | |
2775 | msg = req->r_request; | |
4f1ddb1e JL |
2776 | rhead = find_old_request_head(msg->front.iov_base, |
2777 | session->s_con.peer_features); | |
01a92f17 SW |
2778 | |
2779 | flags = le32_to_cpu(rhead->flags); | |
2780 | flags |= CEPH_MDS_FLAG_REPLAY; | |
2781 | rhead->flags = cpu_to_le32(flags); | |
2782 | ||
2783 | if (req->r_target_inode) | |
2784 | rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode)); | |
2785 | ||
2786 | rhead->num_retry = req->r_attempts - 1; | |
e979cf50 SW |
2787 | |
2788 | /* remove cap/dentry releases from message */ | |
2789 | rhead->num_releases = 0; | |
c5c9a0bf | 2790 | |
c5c9a0bf | 2791 | p = msg->front.iov_base + req->r_request_release_offset; |
60267ba3 | 2792 | encode_timestamp_and_gids(&p, req); |
c5c9a0bf YZ |
2793 | |
2794 | msg->front.iov_len = p - msg->front.iov_base; | |
2795 | msg->hdr.front_len = cpu_to_le32(msg->front.iov_len); | |
01a92f17 SW |
2796 | return 0; |
2797 | } | |
2798 | ||
2f2dc053 SW |
2799 | if (req->r_request) { |
2800 | ceph_msg_put(req->r_request); | |
2801 | req->r_request = NULL; | |
2802 | } | |
4f1ddb1e | 2803 | msg = create_request_message(session, req, drop_cap_releases); |
2f2dc053 | 2804 | if (IS_ERR(msg)) { |
e1518c7c | 2805 | req->r_err = PTR_ERR(msg); |
a79832f2 | 2806 | return PTR_ERR(msg); |
2f2dc053 SW |
2807 | } |
2808 | req->r_request = msg; | |
2809 | ||
4f1ddb1e JL |
2810 | rhead = find_old_request_head(msg->front.iov_base, |
2811 | session->s_con.peer_features); | |
2f2dc053 | 2812 | rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc)); |
bc2de10d | 2813 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
2f2dc053 | 2814 | flags |= CEPH_MDS_FLAG_REPLAY; |
3bb48b41 JL |
2815 | if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) |
2816 | flags |= CEPH_MDS_FLAG_ASYNC; | |
3dd69aab | 2817 | if (req->r_parent) |
2f2dc053 SW |
2818 | flags |= CEPH_MDS_FLAG_WANT_DENTRY; |
2819 | rhead->flags = cpu_to_le32(flags); | |
2820 | rhead->num_fwd = req->r_num_fwd; | |
2821 | rhead->num_retry = req->r_attempts - 1; | |
2822 | ||
3dd69aab | 2823 | dout(" r_parent = %p\n", req->r_parent); |
2f2dc053 SW |
2824 | return 0; |
2825 | } | |
2826 | ||
9cf54563 XL |
2827 | /* |
2828 | * called under mdsc->mutex | |
2829 | */ | |
396bd62c | 2830 | static int __send_request(struct ceph_mds_session *session, |
9cf54563 XL |
2831 | struct ceph_mds_request *req, |
2832 | bool drop_cap_releases) | |
2833 | { | |
2834 | int err; | |
2835 | ||
396bd62c | 2836 | err = __prepare_send_request(session, req, drop_cap_releases); |
9cf54563 XL |
2837 | if (!err) { |
2838 | ceph_msg_get(req->r_request); | |
2839 | ceph_con_send(&session->s_con, req->r_request); | |
2840 | } | |
2841 | ||
2842 | return err; | |
2843 | } | |
2844 | ||
2f2dc053 SW |
2845 | /* |
2846 | * send request, or put it on the appropriate wait list. | |
2847 | */ | |
d5548492 | 2848 | static void __do_request(struct ceph_mds_client *mdsc, |
2f2dc053 SW |
2849 | struct ceph_mds_request *req) |
2850 | { | |
2851 | struct ceph_mds_session *session = NULL; | |
2852 | int mds = -1; | |
48fec5d0 | 2853 | int err = 0; |
c4853e97 | 2854 | bool random; |
2f2dc053 | 2855 | |
bc2de10d JL |
2856 | if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { |
2857 | if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) | |
eb1b8af3 | 2858 | __unregister_request(mdsc, req); |
d5548492 | 2859 | return; |
eb1b8af3 | 2860 | } |
2f2dc053 SW |
2861 | |
2862 | if (req->r_timeout && | |
2863 | time_after_eq(jiffies, req->r_started + req->r_timeout)) { | |
2864 | dout("do_request timed out\n"); | |
8ccf7fcc | 2865 | err = -ETIMEDOUT; |
2f2dc053 SW |
2866 | goto finish; |
2867 | } | |
52953d55 | 2868 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) { |
48fec5d0 YZ |
2869 | dout("do_request forced umount\n"); |
2870 | err = -EIO; | |
2871 | goto finish; | |
2872 | } | |
52953d55 | 2873 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) { |
e9e427f0 YZ |
2874 | if (mdsc->mdsmap_err) { |
2875 | err = mdsc->mdsmap_err; | |
2876 | dout("do_request mdsmap err %d\n", err); | |
2877 | goto finish; | |
2878 | } | |
cc8e8342 YZ |
2879 | if (mdsc->mdsmap->m_epoch == 0) { |
2880 | dout("do_request no mdsmap, waiting for map\n"); | |
2881 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
d5548492 | 2882 | return; |
cc8e8342 | 2883 | } |
e9e427f0 YZ |
2884 | if (!(mdsc->fsc->mount_options->flags & |
2885 | CEPH_MOUNT_OPT_MOUNTWAIT) && | |
2886 | !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) { | |
97820058 | 2887 | err = -EHOSTUNREACH; |
e9e427f0 YZ |
2888 | goto finish; |
2889 | } | |
2890 | } | |
2f2dc053 | 2891 | |
dc69e2e9 SW |
2892 | put_request_session(req); |
2893 | ||
c4853e97 | 2894 | mds = __choose_mds(mdsc, req, &random); |
2f2dc053 SW |
2895 | if (mds < 0 || |
2896 | ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) { | |
3bb48b41 JL |
2897 | if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { |
2898 | err = -EJUKEBOX; | |
2899 | goto finish; | |
2900 | } | |
2f2dc053 SW |
2901 | dout("do_request no mds or not active, waiting for map\n"); |
2902 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
d5548492 | 2903 | return; |
2f2dc053 SW |
2904 | } |
2905 | ||
2906 | /* get, open session */ | |
2907 | session = __ceph_lookup_mds_session(mdsc, mds); | |
9c423956 | 2908 | if (!session) { |
2f2dc053 | 2909 | session = register_session(mdsc, mds); |
9c423956 SW |
2910 | if (IS_ERR(session)) { |
2911 | err = PTR_ERR(session); | |
2912 | goto finish; | |
2913 | } | |
2914 | } | |
5b3248c6 | 2915 | req->r_session = ceph_get_mds_session(session); |
dc69e2e9 | 2916 | |
2f2dc053 | 2917 | dout("do_request mds%d session %p state %s\n", mds, session, |
a687ecaf | 2918 | ceph_session_state_name(session->s_state)); |
2f2dc053 SW |
2919 | if (session->s_state != CEPH_MDS_SESSION_OPEN && |
2920 | session->s_state != CEPH_MDS_SESSION_HUNG) { | |
3bb48b41 JL |
2921 | /* |
2922 | * We cannot queue async requests since the caps and delegated | |
2923 | * inodes are bound to the session. Just return -EJUKEBOX and | |
2924 | * let the caller retry a sync request in that case. | |
2925 | */ | |
2926 | if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) { | |
2927 | err = -EJUKEBOX; | |
2928 | goto out_session; | |
2929 | } | |
4ae3713f JL |
2930 | |
2931 | /* | |
2932 | * If the session has been REJECTED, then return a hard error, | |
2933 | * unless it's a CLEANRECOVER mount, in which case we'll queue | |
2934 | * it to the mdsc queue. | |
2935 | */ | |
2936 | if (session->s_state == CEPH_MDS_SESSION_REJECTED) { | |
2937 | if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER)) | |
2938 | list_add(&req->r_wait, &mdsc->waiting_for_map); | |
2939 | else | |
2940 | err = -EACCES; | |
2941 | goto out_session; | |
2942 | } | |
2943 | ||
2f2dc053 | 2944 | if (session->s_state == CEPH_MDS_SESSION_NEW || |
c4853e97 | 2945 | session->s_state == CEPH_MDS_SESSION_CLOSING) { |
b682c6d4 XL |
2946 | err = __open_session(mdsc, session); |
2947 | if (err) | |
2948 | goto out_session; | |
c4853e97 XL |
2949 | /* retry the same mds later */ |
2950 | if (random) | |
2951 | req->r_resend_mds = mds; | |
2952 | } | |
2f2dc053 SW |
2953 | list_add(&req->r_wait, &session->s_waiting); |
2954 | goto out_session; | |
2955 | } | |
2956 | ||
2957 | /* send request */ | |
2f2dc053 SW |
2958 | req->r_resend_mds = -1; /* forget any previous mds hint */ |
2959 | ||
2960 | if (req->r_request_started == 0) /* note request start time */ | |
2961 | req->r_request_started = jiffies; | |
2962 | ||
00061645 XL |
2963 | /* |
2964 | * For async create we will choose the auth MDS of frag in parent | |
2965 | * directory to send the request and ususally this works fine, but | |
2966 | * if the migrated the dirtory to another MDS before it could handle | |
2967 | * it the request will be forwarded. | |
2968 | * | |
2969 | * And then the auth cap will be changed. | |
2970 | */ | |
2971 | if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) { | |
2972 | struct ceph_dentry_info *di = ceph_dentry(req->r_dentry); | |
2973 | struct ceph_inode_info *ci; | |
2974 | struct ceph_cap *cap; | |
2975 | ||
2976 | /* | |
2977 | * The request maybe handled very fast and the new inode | |
2978 | * hasn't been linked to the dentry yet. We need to wait | |
2979 | * for the ceph_finish_async_create(), which shouldn't be | |
2980 | * stuck too long or fail in thoery, to finish when forwarding | |
2981 | * the request. | |
2982 | */ | |
2983 | if (!d_inode(req->r_dentry)) { | |
2984 | err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT, | |
2985 | TASK_KILLABLE); | |
2986 | if (err) { | |
2987 | mutex_lock(&req->r_fill_mutex); | |
2988 | set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); | |
2989 | mutex_unlock(&req->r_fill_mutex); | |
2990 | goto out_session; | |
2991 | } | |
2992 | } | |
2993 | ||
2994 | ci = ceph_inode(d_inode(req->r_dentry)); | |
2995 | ||
2996 | spin_lock(&ci->i_ceph_lock); | |
2997 | cap = ci->i_auth_cap; | |
2998 | if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) { | |
2999 | dout("do_request session changed for auth cap %d -> %d\n", | |
3000 | cap->session->s_mds, session->s_mds); | |
3001 | ||
3002 | /* Remove the auth cap from old session */ | |
3003 | spin_lock(&cap->session->s_cap_lock); | |
3004 | cap->session->s_nr_caps--; | |
3005 | list_del_init(&cap->session_caps); | |
3006 | spin_unlock(&cap->session->s_cap_lock); | |
3007 | ||
3008 | /* Add the auth cap to the new session */ | |
3009 | cap->mds = mds; | |
3010 | cap->session = session; | |
3011 | spin_lock(&session->s_cap_lock); | |
3012 | session->s_nr_caps++; | |
3013 | list_add_tail(&cap->session_caps, &session->s_caps); | |
3014 | spin_unlock(&session->s_cap_lock); | |
3015 | ||
3016 | change_auth_cap_ses(ci, session); | |
3017 | } | |
3018 | spin_unlock(&ci->i_ceph_lock); | |
3019 | } | |
3020 | ||
396bd62c | 3021 | err = __send_request(session, req, false); |
2f2dc053 SW |
3022 | |
3023 | out_session: | |
3024 | ceph_put_mds_session(session); | |
48fec5d0 YZ |
3025 | finish: |
3026 | if (err) { | |
3027 | dout("__do_request early error %d\n", err); | |
3028 | req->r_err = err; | |
3029 | complete_request(mdsc, req); | |
3030 | __unregister_request(mdsc, req); | |
3031 | } | |
d5548492 | 3032 | return; |
2f2dc053 SW |
3033 | } |
3034 | ||
3035 | /* | |
3036 | * called under mdsc->mutex | |
3037 | */ | |
3038 | static void __wake_requests(struct ceph_mds_client *mdsc, | |
3039 | struct list_head *head) | |
3040 | { | |
ed75ec2c YZ |
3041 | struct ceph_mds_request *req; |
3042 | LIST_HEAD(tmp_list); | |
3043 | ||
3044 | list_splice_init(head, &tmp_list); | |
2f2dc053 | 3045 | |
ed75ec2c YZ |
3046 | while (!list_empty(&tmp_list)) { |
3047 | req = list_entry(tmp_list.next, | |
3048 | struct ceph_mds_request, r_wait); | |
2f2dc053 | 3049 | list_del_init(&req->r_wait); |
7971bd92 | 3050 | dout(" wake request %p tid %llu\n", req, req->r_tid); |
2f2dc053 SW |
3051 | __do_request(mdsc, req); |
3052 | } | |
3053 | } | |
3054 | ||
3055 | /* | |
3056 | * Wake up threads with requests pending for @mds, so that they can | |
29790f26 | 3057 | * resubmit their requests to a possibly different mds. |
2f2dc053 | 3058 | */ |
29790f26 | 3059 | static void kick_requests(struct ceph_mds_client *mdsc, int mds) |
2f2dc053 | 3060 | { |
44ca18f2 | 3061 | struct ceph_mds_request *req; |
282c1052 | 3062 | struct rb_node *p = rb_first(&mdsc->request_tree); |
2f2dc053 SW |
3063 | |
3064 | dout("kick_requests mds%d\n", mds); | |
282c1052 | 3065 | while (p) { |
44ca18f2 | 3066 | req = rb_entry(p, struct ceph_mds_request, r_node); |
282c1052 | 3067 | p = rb_next(p); |
bc2de10d | 3068 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
44ca18f2 | 3069 | continue; |
3de22be6 YZ |
3070 | if (req->r_attempts > 0) |
3071 | continue; /* only new requests */ | |
44ca18f2 SW |
3072 | if (req->r_session && |
3073 | req->r_session->s_mds == mds) { | |
3074 | dout(" kicking tid %llu\n", req->r_tid); | |
03974e81 | 3075 | list_del_init(&req->r_wait); |
44ca18f2 | 3076 | __do_request(mdsc, req); |
2f2dc053 SW |
3077 | } |
3078 | } | |
3079 | } | |
3080 | ||
86bda539 | 3081 | int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir, |
2f2dc053 SW |
3082 | struct ceph_mds_request *req) |
3083 | { | |
891f3f5a | 3084 | int err = 0; |
86bda539 JL |
3085 | |
3086 | /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */ | |
3087 | if (req->r_inode) | |
3088 | ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN); | |
9c1c2b35 | 3089 | if (req->r_parent) { |
719a2514 YZ |
3090 | struct ceph_inode_info *ci = ceph_inode(req->r_parent); |
3091 | int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ? | |
3092 | CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD; | |
3093 | spin_lock(&ci->i_ceph_lock); | |
3094 | ceph_take_cap_refs(ci, CEPH_CAP_PIN, false); | |
3095 | __ceph_touch_fmode(ci, mdsc, fmode); | |
3096 | spin_unlock(&ci->i_ceph_lock); | |
9c1c2b35 | 3097 | } |
86bda539 JL |
3098 | if (req->r_old_dentry_dir) |
3099 | ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir), | |
3100 | CEPH_CAP_PIN); | |
3101 | ||
891f3f5a JL |
3102 | if (req->r_inode) { |
3103 | err = ceph_wait_on_async_create(req->r_inode); | |
3104 | if (err) { | |
3105 | dout("%s: wait for async create returned: %d\n", | |
3106 | __func__, err); | |
3107 | return err; | |
3108 | } | |
3109 | } | |
3110 | ||
3111 | if (!err && req->r_old_inode) { | |
3112 | err = ceph_wait_on_async_create(req->r_old_inode); | |
3113 | if (err) { | |
3114 | dout("%s: wait for async create returned: %d\n", | |
3115 | __func__, err); | |
3116 | return err; | |
3117 | } | |
3118 | } | |
3119 | ||
86bda539 | 3120 | dout("submit_request on %p for inode %p\n", req, dir); |
2f2dc053 | 3121 | mutex_lock(&mdsc->mutex); |
86bda539 | 3122 | __register_request(mdsc, req, dir); |
2f2dc053 | 3123 | __do_request(mdsc, req); |
86bda539 | 3124 | err = req->r_err; |
2f2dc053 | 3125 | mutex_unlock(&mdsc->mutex); |
86bda539 | 3126 | return err; |
2f2dc053 SW |
3127 | } |
3128 | ||
9eaa7b79 JL |
3129 | int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, |
3130 | struct ceph_mds_request *req, | |
3131 | ceph_mds_request_wait_callback_t wait_func) | |
2f2dc053 SW |
3132 | { |
3133 | int err; | |
3134 | ||
e1518c7c | 3135 | /* wait */ |
e1518c7c | 3136 | dout("do_request waiting\n"); |
9eaa7b79 JL |
3137 | if (wait_func) { |
3138 | err = wait_func(mdsc, req); | |
e1518c7c | 3139 | } else { |
5be73034 ID |
3140 | long timeleft = wait_for_completion_killable_timeout( |
3141 | &req->r_completion, | |
3142 | ceph_timeout_jiffies(req->r_timeout)); | |
3143 | if (timeleft > 0) | |
3144 | err = 0; | |
3145 | else if (!timeleft) | |
8ccf7fcc | 3146 | err = -ETIMEDOUT; /* timed out */ |
5be73034 ID |
3147 | else |
3148 | err = timeleft; /* killed */ | |
e1518c7c SW |
3149 | } |
3150 | dout("do_request waited, got %d\n", err); | |
3151 | mutex_lock(&mdsc->mutex); | |
5b1daecd | 3152 | |
e1518c7c | 3153 | /* only abort if we didn't race with a real reply */ |
bc2de10d | 3154 | if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) { |
e1518c7c SW |
3155 | err = le32_to_cpu(req->r_reply_info.head->result); |
3156 | } else if (err < 0) { | |
3157 | dout("aborted request %lld with %d\n", req->r_tid, err); | |
b4556396 SW |
3158 | |
3159 | /* | |
3160 | * ensure we aren't running concurrently with | |
3161 | * ceph_fill_trace or ceph_readdir_prepopulate, which | |
3162 | * rely on locks (dir mutex) held by our caller. | |
3163 | */ | |
3164 | mutex_lock(&req->r_fill_mutex); | |
e1518c7c | 3165 | req->r_err = err; |
bc2de10d | 3166 | set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); |
b4556396 | 3167 | mutex_unlock(&req->r_fill_mutex); |
5b1daecd | 3168 | |
3dd69aab | 3169 | if (req->r_parent && |
167c9e35 SW |
3170 | (req->r_op & CEPH_MDS_OP_WRITE)) |
3171 | ceph_invalidate_dir_request(req); | |
2f2dc053 | 3172 | } else { |
e1518c7c | 3173 | err = req->r_err; |
2f2dc053 | 3174 | } |
2f2dc053 | 3175 | |
e1518c7c | 3176 | mutex_unlock(&mdsc->mutex); |
8340f22c JL |
3177 | return err; |
3178 | } | |
3179 | ||
3180 | /* | |
3181 | * Synchrously perform an mds request. Take care of all of the | |
3182 | * session setup, forwarding, retry details. | |
3183 | */ | |
3184 | int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, | |
3185 | struct inode *dir, | |
3186 | struct ceph_mds_request *req) | |
3187 | { | |
3188 | int err; | |
3189 | ||
3190 | dout("do_request on %p\n", req); | |
3191 | ||
3192 | /* issue */ | |
3193 | err = ceph_mdsc_submit_request(mdsc, dir, req); | |
3194 | if (!err) | |
9eaa7b79 | 3195 | err = ceph_mdsc_wait_request(mdsc, req, NULL); |
2f2dc053 SW |
3196 | dout("do_request %p done, result %d\n", req, err); |
3197 | return err; | |
3198 | } | |
3199 | ||
167c9e35 | 3200 | /* |
2f276c51 | 3201 | * Invalidate dir's completeness, dentry lease state on an aborted MDS |
167c9e35 SW |
3202 | * namespace request. |
3203 | */ | |
3204 | void ceph_invalidate_dir_request(struct ceph_mds_request *req) | |
3205 | { | |
8d8f371c YZ |
3206 | struct inode *dir = req->r_parent; |
3207 | struct inode *old_dir = req->r_old_dentry_dir; | |
167c9e35 | 3208 | |
8d8f371c | 3209 | dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir); |
167c9e35 | 3210 | |
8d8f371c YZ |
3211 | ceph_dir_clear_complete(dir); |
3212 | if (old_dir) | |
3213 | ceph_dir_clear_complete(old_dir); | |
167c9e35 SW |
3214 | if (req->r_dentry) |
3215 | ceph_invalidate_dentry_lease(req->r_dentry); | |
3216 | if (req->r_old_dentry) | |
3217 | ceph_invalidate_dentry_lease(req->r_old_dentry); | |
3218 | } | |
3219 | ||
2f2dc053 SW |
3220 | /* |
3221 | * Handle mds reply. | |
3222 | * | |
3223 | * We take the session mutex and parse and process the reply immediately. | |
3224 | * This preserves the logical ordering of replies, capabilities, etc., sent | |
3225 | * by the MDS as they are applied to our local cache. | |
3226 | */ | |
3227 | static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg) | |
3228 | { | |
3229 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
3230 | struct ceph_mds_request *req; | |
3231 | struct ceph_mds_reply_head *head = msg->front.iov_base; | |
3232 | struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */ | |
982d6011 | 3233 | struct ceph_snap_realm *realm; |
2f2dc053 SW |
3234 | u64 tid; |
3235 | int err, result; | |
2600d2dd | 3236 | int mds = session->s_mds; |
2f2dc053 | 3237 | |
2f2dc053 SW |
3238 | if (msg->front.iov_len < sizeof(*head)) { |
3239 | pr_err("mdsc_handle_reply got corrupt (short) reply\n"); | |
9ec7cab1 | 3240 | ceph_msg_dump(msg); |
2f2dc053 SW |
3241 | return; |
3242 | } | |
3243 | ||
3244 | /* get request, session */ | |
6df058c0 | 3245 | tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 | 3246 | mutex_lock(&mdsc->mutex); |
fcd00b68 | 3247 | req = lookup_get_request(mdsc, tid); |
2f2dc053 SW |
3248 | if (!req) { |
3249 | dout("handle_reply on unknown tid %llu\n", tid); | |
3250 | mutex_unlock(&mdsc->mutex); | |
3251 | return; | |
3252 | } | |
3253 | dout("handle_reply %p\n", req); | |
2f2dc053 SW |
3254 | |
3255 | /* correct session? */ | |
d96d6049 | 3256 | if (req->r_session != session) { |
2f2dc053 SW |
3257 | pr_err("mdsc_handle_reply got %llu on session mds%d" |
3258 | " not mds%d\n", tid, session->s_mds, | |
3259 | req->r_session ? req->r_session->s_mds : -1); | |
3260 | mutex_unlock(&mdsc->mutex); | |
3261 | goto out; | |
3262 | } | |
3263 | ||
3264 | /* dup? */ | |
bc2de10d JL |
3265 | if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) || |
3266 | (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) { | |
f3ae1b97 | 3267 | pr_warn("got a dup %s reply on %llu from mds%d\n", |
2f2dc053 SW |
3268 | head->safe ? "safe" : "unsafe", tid, mds); |
3269 | mutex_unlock(&mdsc->mutex); | |
3270 | goto out; | |
3271 | } | |
bc2de10d | 3272 | if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) { |
f3ae1b97 | 3273 | pr_warn("got unsafe after safe on %llu from mds%d\n", |
85792d0d SW |
3274 | tid, mds); |
3275 | mutex_unlock(&mdsc->mutex); | |
3276 | goto out; | |
3277 | } | |
2f2dc053 SW |
3278 | |
3279 | result = le32_to_cpu(head->result); | |
3280 | ||
2f2dc053 | 3281 | if (head->safe) { |
bc2de10d | 3282 | set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags); |
2f2dc053 | 3283 | __unregister_request(mdsc, req); |
2f2dc053 | 3284 | |
07edc057 XL |
3285 | /* last request during umount? */ |
3286 | if (mdsc->stopping && !__get_oldest_req(mdsc)) | |
3287 | complete_all(&mdsc->safe_umount_waiters); | |
3288 | ||
bc2de10d | 3289 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { |
2f2dc053 SW |
3290 | /* |
3291 | * We already handled the unsafe response, now do the | |
3292 | * cleanup. No need to examine the response; the MDS | |
3293 | * doesn't include any result info in the safe | |
3294 | * response. And even if it did, there is nothing | |
3295 | * useful we could do with a revised return value. | |
3296 | */ | |
3297 | dout("got safe reply %llu, mds%d\n", tid, mds); | |
2f2dc053 | 3298 | |
2f2dc053 SW |
3299 | mutex_unlock(&mdsc->mutex); |
3300 | goto out; | |
3301 | } | |
e1518c7c | 3302 | } else { |
bc2de10d | 3303 | set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags); |
2f2dc053 SW |
3304 | list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe); |
3305 | } | |
3306 | ||
3307 | dout("handle_reply tid %lld result %d\n", tid, result); | |
3308 | rinfo = &req->r_reply_info; | |
b37fe1f9 | 3309 | if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features)) |
d4846487 | 3310 | err = parse_reply_info(session, msg, rinfo, (u64)-1); |
b37fe1f9 | 3311 | else |
d4846487 | 3312 | err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features); |
2f2dc053 SW |
3313 | mutex_unlock(&mdsc->mutex); |
3314 | ||
bca9fc14 JL |
3315 | /* Must find target inode outside of mutexes to avoid deadlocks */ |
3316 | if ((err >= 0) && rinfo->head->is_target) { | |
3317 | struct inode *in; | |
3318 | struct ceph_vino tvino = { | |
3319 | .ino = le64_to_cpu(rinfo->targeti.in->ino), | |
3320 | .snap = le64_to_cpu(rinfo->targeti.in->snapid) | |
3321 | }; | |
3322 | ||
3323 | in = ceph_get_inode(mdsc->fsc->sb, tvino); | |
3324 | if (IS_ERR(in)) { | |
3325 | err = PTR_ERR(in); | |
3326 | mutex_lock(&session->s_mutex); | |
3327 | goto out_err; | |
3328 | } | |
3329 | req->r_target_inode = in; | |
3330 | } | |
3331 | ||
2f2dc053 SW |
3332 | mutex_lock(&session->s_mutex); |
3333 | if (err < 0) { | |
25933abd | 3334 | pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid); |
9ec7cab1 | 3335 | ceph_msg_dump(msg); |
2f2dc053 SW |
3336 | goto out_err; |
3337 | } | |
3338 | ||
3339 | /* snap trace */ | |
982d6011 | 3340 | realm = NULL; |
2f2dc053 SW |
3341 | if (rinfo->snapblob_len) { |
3342 | down_write(&mdsc->snap_rwsem); | |
3343 | ceph_update_snap_trace(mdsc, rinfo->snapblob, | |
982d6011 YZ |
3344 | rinfo->snapblob + rinfo->snapblob_len, |
3345 | le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP, | |
3346 | &realm); | |
2f2dc053 SW |
3347 | downgrade_write(&mdsc->snap_rwsem); |
3348 | } else { | |
3349 | down_read(&mdsc->snap_rwsem); | |
3350 | } | |
3351 | ||
3352 | /* insert trace into our cache */ | |
b4556396 | 3353 | mutex_lock(&req->r_fill_mutex); |
315f2408 | 3354 | current->journal_info = req; |
f5a03b08 | 3355 | err = ceph_fill_trace(mdsc->fsc->sb, req); |
2f2dc053 | 3356 | if (err == 0) { |
6e8575fa | 3357 | if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR || |
81c6aea5 | 3358 | req->r_op == CEPH_MDS_OP_LSSNAP)) |
2f2dc053 | 3359 | ceph_readdir_prepopulate(req, req->r_session); |
2f2dc053 | 3360 | } |
315f2408 | 3361 | current->journal_info = NULL; |
b4556396 | 3362 | mutex_unlock(&req->r_fill_mutex); |
2f2dc053 SW |
3363 | |
3364 | up_read(&mdsc->snap_rwsem); | |
982d6011 YZ |
3365 | if (realm) |
3366 | ceph_put_snap_realm(mdsc, realm); | |
68cd5b4b | 3367 | |
fe33032d YZ |
3368 | if (err == 0) { |
3369 | if (req->r_target_inode && | |
3370 | test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) { | |
3371 | struct ceph_inode_info *ci = | |
3372 | ceph_inode(req->r_target_inode); | |
3373 | spin_lock(&ci->i_unsafe_lock); | |
3374 | list_add_tail(&req->r_unsafe_target_item, | |
3375 | &ci->i_unsafe_iops); | |
3376 | spin_unlock(&ci->i_unsafe_lock); | |
3377 | } | |
3378 | ||
3379 | ceph_unreserve_caps(mdsc, &req->r_caps_reservation); | |
68cd5b4b | 3380 | } |
2f2dc053 | 3381 | out_err: |
e1518c7c | 3382 | mutex_lock(&mdsc->mutex); |
bc2de10d | 3383 | if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { |
e1518c7c SW |
3384 | if (err) { |
3385 | req->r_err = err; | |
3386 | } else { | |
5fdb1389 | 3387 | req->r_reply = ceph_msg_get(msg); |
bc2de10d | 3388 | set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags); |
e1518c7c | 3389 | } |
2f2dc053 | 3390 | } else { |
e1518c7c | 3391 | dout("reply arrived after request %lld was aborted\n", tid); |
2f2dc053 | 3392 | } |
e1518c7c | 3393 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 3394 | |
2f2dc053 SW |
3395 | mutex_unlock(&session->s_mutex); |
3396 | ||
3397 | /* kick calling process */ | |
3398 | complete_request(mdsc, req); | |
70c94820 | 3399 | |
8ae99ae2 | 3400 | ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency, |
70c94820 | 3401 | req->r_end_latency, err); |
2f2dc053 SW |
3402 | out: |
3403 | ceph_mdsc_put_request(req); | |
3404 | return; | |
3405 | } | |
3406 | ||
3407 | ||
3408 | ||
3409 | /* | |
3410 | * handle mds notification that our request has been forwarded. | |
3411 | */ | |
2600d2dd SW |
3412 | static void handle_forward(struct ceph_mds_client *mdsc, |
3413 | struct ceph_mds_session *session, | |
3414 | struct ceph_msg *msg) | |
2f2dc053 SW |
3415 | { |
3416 | struct ceph_mds_request *req; | |
a1ea787c | 3417 | u64 tid = le64_to_cpu(msg->hdr.tid); |
2f2dc053 SW |
3418 | u32 next_mds; |
3419 | u32 fwd_seq; | |
2f2dc053 SW |
3420 | int err = -EINVAL; |
3421 | void *p = msg->front.iov_base; | |
3422 | void *end = p + msg->front.iov_len; | |
1980b1bf | 3423 | bool aborted = false; |
2f2dc053 | 3424 | |
a1ea787c | 3425 | ceph_decode_need(&p, end, 2*sizeof(u32), bad); |
c89136ea SW |
3426 | next_mds = ceph_decode_32(&p); |
3427 | fwd_seq = ceph_decode_32(&p); | |
2f2dc053 SW |
3428 | |
3429 | mutex_lock(&mdsc->mutex); | |
fcd00b68 | 3430 | req = lookup_get_request(mdsc, tid); |
2f2dc053 | 3431 | if (!req) { |
1980b1bf | 3432 | mutex_unlock(&mdsc->mutex); |
2a8e5e36 | 3433 | dout("forward tid %llu to mds%d - req dne\n", tid, next_mds); |
1980b1bf | 3434 | return; /* dup reply? */ |
2f2dc053 SW |
3435 | } |
3436 | ||
bc2de10d | 3437 | if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) { |
2a8e5e36 SW |
3438 | dout("forward tid %llu aborted, unregistering\n", tid); |
3439 | __unregister_request(mdsc, req); | |
3440 | } else if (fwd_seq <= req->r_num_fwd) { | |
1980b1bf XL |
3441 | /* |
3442 | * The type of 'num_fwd' in ceph 'MClientRequestForward' | |
3443 | * is 'int32_t', while in 'ceph_mds_request_head' the | |
3444 | * type is '__u8'. So in case the request bounces between | |
3445 | * MDSes exceeding 256 times, the client will get stuck. | |
3446 | * | |
3447 | * In this case it's ususally a bug in MDS and continue | |
3448 | * bouncing the request makes no sense. | |
3449 | * | |
3450 | * In future this could be fixed in ceph code, so avoid | |
3451 | * using the hardcode here. | |
3452 | */ | |
3453 | int max = sizeof_field(struct ceph_mds_request_head, num_fwd); | |
3454 | max = 1 << (max * BITS_PER_BYTE); | |
3455 | if (req->r_num_fwd >= max) { | |
3456 | mutex_lock(&req->r_fill_mutex); | |
3457 | req->r_err = -EMULTIHOP; | |
3458 | set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags); | |
3459 | mutex_unlock(&req->r_fill_mutex); | |
3460 | aborted = true; | |
3461 | pr_warn_ratelimited("forward tid %llu seq overflow\n", | |
3462 | tid); | |
3463 | } else { | |
3464 | dout("forward tid %llu to mds%d - old seq %d <= %d\n", | |
3465 | tid, next_mds, req->r_num_fwd, fwd_seq); | |
3466 | } | |
2f2dc053 SW |
3467 | } else { |
3468 | /* resend. forward race not possible; mds would drop */ | |
2a8e5e36 SW |
3469 | dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds); |
3470 | BUG_ON(req->r_err); | |
bc2de10d | 3471 | BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)); |
3de22be6 | 3472 | req->r_attempts = 0; |
2f2dc053 SW |
3473 | req->r_num_fwd = fwd_seq; |
3474 | req->r_resend_mds = next_mds; | |
3475 | put_request_session(req); | |
3476 | __do_request(mdsc, req); | |
3477 | } | |
2f2dc053 | 3478 | mutex_unlock(&mdsc->mutex); |
1980b1bf XL |
3479 | |
3480 | /* kick calling process */ | |
3481 | if (aborted) | |
3482 | complete_request(mdsc, req); | |
3483 | ceph_mdsc_put_request(req); | |
2f2dc053 SW |
3484 | return; |
3485 | ||
3486 | bad: | |
3487 | pr_err("mdsc_handle_forward decode error err=%d\n", err); | |
3488 | } | |
3489 | ||
131d7eb4 | 3490 | static int __decode_session_metadata(void **p, void *end, |
0b98acd6 | 3491 | bool *blocklisted) |
84bf3950 YZ |
3492 | { |
3493 | /* map<string,string> */ | |
3494 | u32 n; | |
131d7eb4 | 3495 | bool err_str; |
84bf3950 YZ |
3496 | ceph_decode_32_safe(p, end, n, bad); |
3497 | while (n-- > 0) { | |
3498 | u32 len; | |
3499 | ceph_decode_32_safe(p, end, len, bad); | |
3500 | ceph_decode_need(p, end, len, bad); | |
131d7eb4 | 3501 | err_str = !strncmp(*p, "error_string", len); |
84bf3950 YZ |
3502 | *p += len; |
3503 | ceph_decode_32_safe(p, end, len, bad); | |
3504 | ceph_decode_need(p, end, len, bad); | |
4bb926e8 ID |
3505 | /* |
3506 | * Match "blocklisted (blacklisted)" from newer MDSes, | |
3507 | * or "blacklisted" from older MDSes. | |
3508 | */ | |
131d7eb4 | 3509 | if (err_str && strnstr(*p, "blacklisted", len)) |
0b98acd6 | 3510 | *blocklisted = true; |
84bf3950 YZ |
3511 | *p += len; |
3512 | } | |
3513 | return 0; | |
3514 | bad: | |
3515 | return -1; | |
3516 | } | |
3517 | ||
2f2dc053 SW |
3518 | /* |
3519 | * handle a mds session control message | |
3520 | */ | |
3521 | static void handle_session(struct ceph_mds_session *session, | |
3522 | struct ceph_msg *msg) | |
3523 | { | |
3524 | struct ceph_mds_client *mdsc = session->s_mdsc; | |
84bf3950 YZ |
3525 | int mds = session->s_mds; |
3526 | int msg_version = le16_to_cpu(msg->hdr.version); | |
3527 | void *p = msg->front.iov_base; | |
3528 | void *end = p + msg->front.iov_len; | |
3529 | struct ceph_mds_session_head *h; | |
2f2dc053 | 3530 | u32 op; |
0fa82633 | 3531 | u64 seq, features = 0; |
2f2dc053 | 3532 | int wake = 0; |
0b98acd6 | 3533 | bool blocklisted = false; |
2f2dc053 | 3534 | |
2f2dc053 | 3535 | /* decode */ |
84bf3950 YZ |
3536 | ceph_decode_need(&p, end, sizeof(*h), bad); |
3537 | h = p; | |
3538 | p += sizeof(*h); | |
3539 | ||
2f2dc053 SW |
3540 | op = le32_to_cpu(h->op); |
3541 | seq = le64_to_cpu(h->seq); | |
3542 | ||
84bf3950 YZ |
3543 | if (msg_version >= 3) { |
3544 | u32 len; | |
e1c9788c KH |
3545 | /* version >= 2 and < 5, decode metadata, skip otherwise |
3546 | * as it's handled via flags. | |
3547 | */ | |
3548 | if (msg_version >= 5) | |
3549 | ceph_decode_skip_map(&p, end, string, string, bad); | |
3550 | else if (__decode_session_metadata(&p, end, &blocklisted) < 0) | |
84bf3950 | 3551 | goto bad; |
e1c9788c | 3552 | |
84bf3950 YZ |
3553 | /* version >= 3, feature bits */ |
3554 | ceph_decode_32_safe(&p, end, len, bad); | |
02e37571 JL |
3555 | if (len) { |
3556 | ceph_decode_64_safe(&p, end, features, bad); | |
3557 | p += len - sizeof(features); | |
3558 | } | |
84bf3950 YZ |
3559 | } |
3560 | ||
e1c9788c | 3561 | if (msg_version >= 5) { |
ea16567f LH |
3562 | u32 flags, len; |
3563 | ||
3564 | /* version >= 4 */ | |
3565 | ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */ | |
3566 | ceph_decode_32_safe(&p, end, len, bad); /* len */ | |
3567 | ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */ | |
3568 | ||
e1c9788c | 3569 | /* version >= 5, flags */ |
ea16567f | 3570 | ceph_decode_32_safe(&p, end, flags, bad); |
e1c9788c | 3571 | if (flags & CEPH_SESSION_BLOCKLISTED) { |
ea16567f | 3572 | pr_warn("mds%d session blocklisted\n", session->s_mds); |
e1c9788c KH |
3573 | blocklisted = true; |
3574 | } | |
3575 | } | |
3576 | ||
2f2dc053 | 3577 | mutex_lock(&mdsc->mutex); |
0a07fc8c | 3578 | if (op == CEPH_SESSION_CLOSE) { |
5b3248c6 | 3579 | ceph_get_mds_session(session); |
2600d2dd | 3580 | __unregister_session(mdsc, session); |
0a07fc8c | 3581 | } |
2f2dc053 SW |
3582 | /* FIXME: this ttl calculation is generous */ |
3583 | session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose; | |
3584 | mutex_unlock(&mdsc->mutex); | |
3585 | ||
3586 | mutex_lock(&session->s_mutex); | |
3587 | ||
3588 | dout("handle_session mds%d %s %p state %s seq %llu\n", | |
3589 | mds, ceph_session_op_name(op), session, | |
a687ecaf | 3590 | ceph_session_state_name(session->s_state), seq); |
2f2dc053 SW |
3591 | |
3592 | if (session->s_state == CEPH_MDS_SESSION_HUNG) { | |
3593 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
3594 | pr_info("mds%d came back\n", session->s_mds); | |
3595 | } | |
3596 | ||
3597 | switch (op) { | |
3598 | case CEPH_SESSION_OPEN: | |
29790f26 SW |
3599 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
3600 | pr_info("mds%d reconnect success\n", session->s_mds); | |
300e42a2 XL |
3601 | |
3602 | if (session->s_state == CEPH_MDS_SESSION_OPEN) { | |
3603 | pr_notice("mds%d is already opened\n", session->s_mds); | |
3604 | } else { | |
3605 | session->s_state = CEPH_MDS_SESSION_OPEN; | |
3606 | session->s_features = features; | |
3607 | renewed_caps(mdsc, session, 0); | |
3608 | if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT, | |
3609 | &session->s_features)) | |
3610 | metric_schedule_delayed(&mdsc->metric); | |
3611 | } | |
3612 | ||
3613 | /* | |
3614 | * The connection maybe broken and the session in client | |
3615 | * side has been reinitialized, need to update the seq | |
3616 | * anyway. | |
3617 | */ | |
3618 | if (!session->s_seq && seq) | |
3619 | session->s_seq = seq; | |
3620 | ||
2f2dc053 SW |
3621 | wake = 1; |
3622 | if (mdsc->stopping) | |
3623 | __close_session(mdsc, session); | |
3624 | break; | |
3625 | ||
3626 | case CEPH_SESSION_RENEWCAPS: | |
3627 | if (session->s_renew_seq == seq) | |
3628 | renewed_caps(mdsc, session, 1); | |
3629 | break; | |
3630 | ||
3631 | case CEPH_SESSION_CLOSE: | |
29790f26 SW |
3632 | if (session->s_state == CEPH_MDS_SESSION_RECONNECTING) |
3633 | pr_info("mds%d reconnect denied\n", session->s_mds); | |
4d681c2f | 3634 | session->s_state = CEPH_MDS_SESSION_CLOSED; |
1c841a96 | 3635 | cleanup_session_requests(mdsc, session); |
2f2dc053 | 3636 | remove_session_caps(session); |
656e4382 | 3637 | wake = 2; /* for good measure */ |
f3c60c59 | 3638 | wake_up_all(&mdsc->session_close_wq); |
2f2dc053 SW |
3639 | break; |
3640 | ||
3641 | case CEPH_SESSION_STALE: | |
3642 | pr_info("mds%d caps went stale, renewing\n", | |
3643 | session->s_mds); | |
52d60f8e | 3644 | atomic_inc(&session->s_cap_gen); |
1ce208a6 | 3645 | session->s_cap_ttl = jiffies - 1; |
2f2dc053 SW |
3646 | send_renew_caps(mdsc, session); |
3647 | break; | |
3648 | ||
3649 | case CEPH_SESSION_RECALL_STATE: | |
e30ee581 | 3650 | ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps)); |
2f2dc053 SW |
3651 | break; |
3652 | ||
186e4f7a YZ |
3653 | case CEPH_SESSION_FLUSHMSG: |
3654 | send_flushmsg_ack(mdsc, session, seq); | |
3655 | break; | |
3656 | ||
03f4fcb0 YZ |
3657 | case CEPH_SESSION_FORCE_RO: |
3658 | dout("force_session_readonly %p\n", session); | |
3659 | spin_lock(&session->s_cap_lock); | |
3660 | session->s_readonly = true; | |
3661 | spin_unlock(&session->s_cap_lock); | |
d2f8bb27 | 3662 | wake_up_session_caps(session, FORCE_RO); |
03f4fcb0 YZ |
3663 | break; |
3664 | ||
fcff415c YZ |
3665 | case CEPH_SESSION_REJECT: |
3666 | WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING); | |
3667 | pr_info("mds%d rejected session\n", session->s_mds); | |
3668 | session->s_state = CEPH_MDS_SESSION_REJECTED; | |
3669 | cleanup_session_requests(mdsc, session); | |
3670 | remove_session_caps(session); | |
0b98acd6 ID |
3671 | if (blocklisted) |
3672 | mdsc->fsc->blocklisted = true; | |
fcff415c YZ |
3673 | wake = 2; /* for good measure */ |
3674 | break; | |
3675 | ||
2f2dc053 SW |
3676 | default: |
3677 | pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds); | |
3678 | WARN_ON(1); | |
3679 | } | |
3680 | ||
3681 | mutex_unlock(&session->s_mutex); | |
3682 | if (wake) { | |
3683 | mutex_lock(&mdsc->mutex); | |
3684 | __wake_requests(mdsc, &session->s_waiting); | |
656e4382 YZ |
3685 | if (wake == 2) |
3686 | kick_requests(mdsc, mds); | |
2f2dc053 SW |
3687 | mutex_unlock(&mdsc->mutex); |
3688 | } | |
0a07fc8c YZ |
3689 | if (op == CEPH_SESSION_CLOSE) |
3690 | ceph_put_mds_session(session); | |
2f2dc053 SW |
3691 | return; |
3692 | ||
3693 | bad: | |
3694 | pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds, | |
3695 | (int)msg->front.iov_len); | |
9ec7cab1 | 3696 | ceph_msg_dump(msg); |
2f2dc053 SW |
3697 | return; |
3698 | } | |
3699 | ||
a25949b9 JL |
3700 | void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req) |
3701 | { | |
3702 | int dcaps; | |
3703 | ||
3704 | dcaps = xchg(&req->r_dir_caps, 0); | |
3705 | if (dcaps) { | |
3706 | dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); | |
3707 | ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps); | |
3708 | } | |
3709 | } | |
3710 | ||
e64f44a8 XL |
3711 | void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req) |
3712 | { | |
3713 | int dcaps; | |
3714 | ||
3715 | dcaps = xchg(&req->r_dir_caps, 0); | |
3716 | if (dcaps) { | |
3717 | dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps)); | |
3718 | ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent), | |
3719 | dcaps); | |
3720 | } | |
3721 | } | |
3722 | ||
2f2dc053 SW |
3723 | /* |
3724 | * called under session->mutex. | |
3725 | */ | |
3726 | static void replay_unsafe_requests(struct ceph_mds_client *mdsc, | |
3727 | struct ceph_mds_session *session) | |
3728 | { | |
3729 | struct ceph_mds_request *req, *nreq; | |
3de22be6 | 3730 | struct rb_node *p; |
2f2dc053 SW |
3731 | |
3732 | dout("replay_unsafe_requests mds%d\n", session->s_mds); | |
3733 | ||
3734 | mutex_lock(&mdsc->mutex); | |
9cf54563 | 3735 | list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) |
396bd62c | 3736 | __send_request(session, req, true); |
3de22be6 YZ |
3737 | |
3738 | /* | |
3739 | * also re-send old requests when MDS enters reconnect stage. So that MDS | |
3740 | * can process completed request in clientreplay stage. | |
3741 | */ | |
3742 | p = rb_first(&mdsc->request_tree); | |
3743 | while (p) { | |
3744 | req = rb_entry(p, struct ceph_mds_request, r_node); | |
3745 | p = rb_next(p); | |
bc2de10d | 3746 | if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) |
3de22be6 YZ |
3747 | continue; |
3748 | if (req->r_attempts == 0) | |
3749 | continue; /* only old requests */ | |
a25949b9 JL |
3750 | if (!req->r_session) |
3751 | continue; | |
3752 | if (req->r_session->s_mds != session->s_mds) | |
3753 | continue; | |
3754 | ||
e64f44a8 | 3755 | ceph_mdsc_release_dir_caps_no_check(req); |
a25949b9 | 3756 | |
396bd62c | 3757 | __send_request(session, req, true); |
3de22be6 | 3758 | } |
2f2dc053 SW |
3759 | mutex_unlock(&mdsc->mutex); |
3760 | } | |
3761 | ||
81c5a148 YZ |
3762 | static int send_reconnect_partial(struct ceph_reconnect_state *recon_state) |
3763 | { | |
3764 | struct ceph_msg *reply; | |
3765 | struct ceph_pagelist *_pagelist; | |
3766 | struct page *page; | |
3767 | __le32 *addr; | |
3768 | int err = -ENOMEM; | |
3769 | ||
3770 | if (!recon_state->allow_multi) | |
3771 | return -ENOSPC; | |
3772 | ||
3773 | /* can't handle message that contains both caps and realm */ | |
3774 | BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms); | |
3775 | ||
3776 | /* pre-allocate new pagelist */ | |
3777 | _pagelist = ceph_pagelist_alloc(GFP_NOFS); | |
3778 | if (!_pagelist) | |
3779 | return -ENOMEM; | |
3780 | ||
3781 | reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); | |
3782 | if (!reply) | |
3783 | goto fail_msg; | |
3784 | ||
3785 | /* placeholder for nr_caps */ | |
3786 | err = ceph_pagelist_encode_32(_pagelist, 0); | |
3787 | if (err < 0) | |
3788 | goto fail; | |
3789 | ||
3790 | if (recon_state->nr_caps) { | |
3791 | /* currently encoding caps */ | |
3792 | err = ceph_pagelist_encode_32(recon_state->pagelist, 0); | |
3793 | if (err) | |
3794 | goto fail; | |
3795 | } else { | |
3796 | /* placeholder for nr_realms (currently encoding relams) */ | |
3797 | err = ceph_pagelist_encode_32(_pagelist, 0); | |
3798 | if (err < 0) | |
3799 | goto fail; | |
3800 | } | |
3801 | ||
3802 | err = ceph_pagelist_encode_8(recon_state->pagelist, 1); | |
3803 | if (err) | |
3804 | goto fail; | |
3805 | ||
3806 | page = list_first_entry(&recon_state->pagelist->head, struct page, lru); | |
3807 | addr = kmap_atomic(page); | |
3808 | if (recon_state->nr_caps) { | |
3809 | /* currently encoding caps */ | |
3810 | *addr = cpu_to_le32(recon_state->nr_caps); | |
3811 | } else { | |
3812 | /* currently encoding relams */ | |
3813 | *(addr + 1) = cpu_to_le32(recon_state->nr_realms); | |
3814 | } | |
3815 | kunmap_atomic(addr); | |
3816 | ||
3817 | reply->hdr.version = cpu_to_le16(5); | |
3818 | reply->hdr.compat_version = cpu_to_le16(4); | |
3819 | ||
3820 | reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length); | |
3821 | ceph_msg_data_add_pagelist(reply, recon_state->pagelist); | |
3822 | ||
3823 | ceph_con_send(&recon_state->session->s_con, reply); | |
3824 | ceph_pagelist_release(recon_state->pagelist); | |
3825 | ||
3826 | recon_state->pagelist = _pagelist; | |
3827 | recon_state->nr_caps = 0; | |
3828 | recon_state->nr_realms = 0; | |
3829 | recon_state->msg_version = 5; | |
3830 | return 0; | |
3831 | fail: | |
3832 | ceph_msg_put(reply); | |
3833 | fail_msg: | |
3834 | ceph_pagelist_release(_pagelist); | |
3835 | return err; | |
3836 | } | |
3837 | ||
a33f6432 YZ |
3838 | static struct dentry* d_find_primary(struct inode *inode) |
3839 | { | |
3840 | struct dentry *alias, *dn = NULL; | |
3841 | ||
3842 | if (hlist_empty(&inode->i_dentry)) | |
3843 | return NULL; | |
3844 | ||
3845 | spin_lock(&inode->i_lock); | |
3846 | if (hlist_empty(&inode->i_dentry)) | |
3847 | goto out_unlock; | |
3848 | ||
3849 | if (S_ISDIR(inode->i_mode)) { | |
3850 | alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias); | |
3851 | if (!IS_ROOT(alias)) | |
3852 | dn = dget(alias); | |
3853 | goto out_unlock; | |
3854 | } | |
3855 | ||
3856 | hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { | |
3857 | spin_lock(&alias->d_lock); | |
3858 | if (!d_unhashed(alias) && | |
3859 | (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) { | |
3860 | dn = dget_dlock(alias); | |
3861 | } | |
3862 | spin_unlock(&alias->d_lock); | |
3863 | if (dn) | |
3864 | break; | |
3865 | } | |
3866 | out_unlock: | |
3867 | spin_unlock(&inode->i_lock); | |
3868 | return dn; | |
3869 | } | |
3870 | ||
2f2dc053 SW |
3871 | /* |
3872 | * Encode information about a cap for a reconnect with the MDS. | |
3873 | */ | |
a25949b9 | 3874 | static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap, |
2f2dc053 SW |
3875 | void *arg) |
3876 | { | |
20cb34ae SW |
3877 | union { |
3878 | struct ceph_mds_cap_reconnect v2; | |
3879 | struct ceph_mds_cap_reconnect_v1 v1; | |
3880 | } rec; | |
b3f8d68f | 3881 | struct ceph_inode_info *ci = cap->ci; |
20cb34ae SW |
3882 | struct ceph_reconnect_state *recon_state = arg; |
3883 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
a33f6432 YZ |
3884 | struct dentry *dentry; |
3885 | char *path; | |
ee2a095d | 3886 | int pathlen = 0, err; |
a33f6432 | 3887 | u64 pathbase; |
3469ed0d | 3888 | u64 snap_follows; |
2f2dc053 | 3889 | |
2f2dc053 SW |
3890 | dout(" adding %p ino %llx.%llx cap %p %lld %s\n", |
3891 | inode, ceph_vinop(inode), cap, cap->cap_id, | |
3892 | ceph_cap_string(cap->issued)); | |
2f2dc053 | 3893 | |
a33f6432 YZ |
3894 | dentry = d_find_primary(inode); |
3895 | if (dentry) { | |
3896 | /* set pathbase to parent dir when msg_version >= 2 */ | |
3897 | path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, | |
3898 | recon_state->msg_version >= 2); | |
3899 | dput(dentry); | |
3900 | if (IS_ERR(path)) { | |
3901 | err = PTR_ERR(path); | |
3902 | goto out_err; | |
3903 | } | |
3904 | } else { | |
3905 | path = NULL; | |
a33f6432 YZ |
3906 | pathbase = 0; |
3907 | } | |
3908 | ||
be655596 | 3909 | spin_lock(&ci->i_ceph_lock); |
2f2dc053 SW |
3910 | cap->seq = 0; /* reset cap seq */ |
3911 | cap->issue_seq = 0; /* and issue_seq */ | |
667ca05c | 3912 | cap->mseq = 0; /* and migrate_seq */ |
52d60f8e | 3913 | cap->cap_gen = atomic_read(&cap->session->s_cap_gen); |
20cb34ae | 3914 | |
a25949b9 | 3915 | /* These are lost when the session goes away */ |
785892fe JL |
3916 | if (S_ISDIR(inode->i_mode)) { |
3917 | if (cap->issued & CEPH_CAP_DIR_CREATE) { | |
3918 | ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); | |
3919 | memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); | |
3920 | } | |
a25949b9 | 3921 | cap->issued &= ~CEPH_CAP_ANY_DIR_OPS; |
785892fe | 3922 | } |
a25949b9 | 3923 | |
121f22a1 | 3924 | if (recon_state->msg_version >= 2) { |
20cb34ae SW |
3925 | rec.v2.cap_id = cpu_to_le64(cap->cap_id); |
3926 | rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
3927 | rec.v2.issued = cpu_to_le32(cap->issued); | |
3928 | rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); | |
a33f6432 | 3929 | rec.v2.pathbase = cpu_to_le64(pathbase); |
ec1dff25 JL |
3930 | rec.v2.flock_len = (__force __le32) |
3931 | ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1); | |
20cb34ae SW |
3932 | } else { |
3933 | rec.v1.cap_id = cpu_to_le64(cap->cap_id); | |
3934 | rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci)); | |
3935 | rec.v1.issued = cpu_to_le32(cap->issued); | |
2d6795fb | 3936 | rec.v1.size = cpu_to_le64(i_size_read(inode)); |
9bbeab41 AB |
3937 | ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime); |
3938 | ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime); | |
20cb34ae | 3939 | rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino); |
a33f6432 | 3940 | rec.v1.pathbase = cpu_to_le64(pathbase); |
20cb34ae | 3941 | } |
3469ed0d YZ |
3942 | |
3943 | if (list_empty(&ci->i_cap_snaps)) { | |
92776fd2 | 3944 | snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0; |
3469ed0d YZ |
3945 | } else { |
3946 | struct ceph_cap_snap *capsnap = | |
3947 | list_first_entry(&ci->i_cap_snaps, | |
3948 | struct ceph_cap_snap, ci_item); | |
3949 | snap_follows = capsnap->follows; | |
20cb34ae | 3950 | } |
be655596 | 3951 | spin_unlock(&ci->i_ceph_lock); |
2f2dc053 | 3952 | |
121f22a1 | 3953 | if (recon_state->msg_version >= 2) { |
40819f6f | 3954 | int num_fcntl_locks, num_flock_locks; |
4deb14a2 | 3955 | struct ceph_filelock *flocks = NULL; |
81c5a148 | 3956 | size_t struct_len, total_len = sizeof(u64); |
121f22a1 | 3957 | u8 struct_v = 0; |
39be95e9 JS |
3958 | |
3959 | encode_again: | |
b3f8d68f YZ |
3960 | if (rec.v2.flock_len) { |
3961 | ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks); | |
3962 | } else { | |
3963 | num_fcntl_locks = 0; | |
3964 | num_flock_locks = 0; | |
3965 | } | |
4deb14a2 | 3966 | if (num_fcntl_locks + num_flock_locks > 0) { |
6da2ec56 KC |
3967 | flocks = kmalloc_array(num_fcntl_locks + num_flock_locks, |
3968 | sizeof(struct ceph_filelock), | |
3969 | GFP_NOFS); | |
4deb14a2 YZ |
3970 | if (!flocks) { |
3971 | err = -ENOMEM; | |
5ccedf1c | 3972 | goto out_err; |
4deb14a2 YZ |
3973 | } |
3974 | err = ceph_encode_locks_to_buffer(inode, flocks, | |
3975 | num_fcntl_locks, | |
3976 | num_flock_locks); | |
3977 | if (err) { | |
3978 | kfree(flocks); | |
3979 | flocks = NULL; | |
3980 | if (err == -ENOSPC) | |
3981 | goto encode_again; | |
5ccedf1c | 3982 | goto out_err; |
4deb14a2 YZ |
3983 | } |
3984 | } else { | |
39be95e9 | 3985 | kfree(flocks); |
4deb14a2 | 3986 | flocks = NULL; |
39be95e9 | 3987 | } |
121f22a1 YZ |
3988 | |
3989 | if (recon_state->msg_version >= 3) { | |
3990 | /* version, compat_version and struct_len */ | |
81c5a148 | 3991 | total_len += 2 * sizeof(u8) + sizeof(u32); |
3469ed0d | 3992 | struct_v = 2; |
121f22a1 | 3993 | } |
39be95e9 JS |
3994 | /* |
3995 | * number of encoded locks is stable, so copy to pagelist | |
3996 | */ | |
121f22a1 YZ |
3997 | struct_len = 2 * sizeof(u32) + |
3998 | (num_fcntl_locks + num_flock_locks) * | |
3999 | sizeof(struct ceph_filelock); | |
4000 | rec.v2.flock_len = cpu_to_le32(struct_len); | |
4001 | ||
a33f6432 | 4002 | struct_len += sizeof(u32) + pathlen + sizeof(rec.v2); |
121f22a1 | 4003 | |
3469ed0d YZ |
4004 | if (struct_v >= 2) |
4005 | struct_len += sizeof(u64); /* snap_follows */ | |
4006 | ||
121f22a1 | 4007 | total_len += struct_len; |
81c5a148 YZ |
4008 | |
4009 | if (pagelist->length + total_len > RECONNECT_MAX_SIZE) { | |
4010 | err = send_reconnect_partial(recon_state); | |
4011 | if (err) | |
4012 | goto out_freeflocks; | |
4013 | pagelist = recon_state->pagelist; | |
5ccedf1c | 4014 | } |
121f22a1 | 4015 | |
81c5a148 YZ |
4016 | err = ceph_pagelist_reserve(pagelist, total_len); |
4017 | if (err) | |
4018 | goto out_freeflocks; | |
4019 | ||
4020 | ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); | |
5ccedf1c YZ |
4021 | if (recon_state->msg_version >= 3) { |
4022 | ceph_pagelist_encode_8(pagelist, struct_v); | |
4023 | ceph_pagelist_encode_8(pagelist, 1); | |
4024 | ceph_pagelist_encode_32(pagelist, struct_len); | |
121f22a1 | 4025 | } |
a33f6432 | 4026 | ceph_pagelist_encode_string(pagelist, path, pathlen); |
5ccedf1c YZ |
4027 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2)); |
4028 | ceph_locks_to_pagelist(flocks, pagelist, | |
4029 | num_fcntl_locks, num_flock_locks); | |
4030 | if (struct_v >= 2) | |
4031 | ceph_pagelist_encode_64(pagelist, snap_follows); | |
81c5a148 | 4032 | out_freeflocks: |
39be95e9 | 4033 | kfree(flocks); |
3612abbd | 4034 | } else { |
5ccedf1c | 4035 | err = ceph_pagelist_reserve(pagelist, |
81c5a148 YZ |
4036 | sizeof(u64) + sizeof(u32) + |
4037 | pathlen + sizeof(rec.v1)); | |
a33f6432 YZ |
4038 | if (err) |
4039 | goto out_err; | |
5ccedf1c | 4040 | |
81c5a148 | 4041 | ceph_pagelist_encode_64(pagelist, ceph_ino(inode)); |
5ccedf1c YZ |
4042 | ceph_pagelist_encode_string(pagelist, path, pathlen); |
4043 | ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1)); | |
40819f6f | 4044 | } |
44c99757 | 4045 | |
5ccedf1c | 4046 | out_err: |
a33f6432 YZ |
4047 | ceph_mdsc_free_path(path, pathlen); |
4048 | if (!err) | |
81c5a148 YZ |
4049 | recon_state->nr_caps++; |
4050 | return err; | |
4051 | } | |
4052 | ||
4053 | static int encode_snap_realms(struct ceph_mds_client *mdsc, | |
4054 | struct ceph_reconnect_state *recon_state) | |
4055 | { | |
4056 | struct rb_node *p; | |
4057 | struct ceph_pagelist *pagelist = recon_state->pagelist; | |
4058 | int err = 0; | |
4059 | ||
4060 | if (recon_state->msg_version >= 4) { | |
4061 | err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms); | |
4062 | if (err < 0) | |
4063 | goto fail; | |
4064 | } | |
4065 | ||
4066 | /* | |
4067 | * snaprealms. we provide mds with the ino, seq (version), and | |
4068 | * parent for all of our realms. If the mds has any newer info, | |
4069 | * it will tell us. | |
4070 | */ | |
4071 | for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) { | |
4072 | struct ceph_snap_realm *realm = | |
4073 | rb_entry(p, struct ceph_snap_realm, node); | |
4074 | struct ceph_mds_snaprealm_reconnect sr_rec; | |
4075 | ||
4076 | if (recon_state->msg_version >= 4) { | |
4077 | size_t need = sizeof(u8) * 2 + sizeof(u32) + | |
4078 | sizeof(sr_rec); | |
4079 | ||
4080 | if (pagelist->length + need > RECONNECT_MAX_SIZE) { | |
4081 | err = send_reconnect_partial(recon_state); | |
4082 | if (err) | |
4083 | goto fail; | |
4084 | pagelist = recon_state->pagelist; | |
4085 | } | |
4086 | ||
4087 | err = ceph_pagelist_reserve(pagelist, need); | |
4088 | if (err) | |
4089 | goto fail; | |
4090 | ||
4091 | ceph_pagelist_encode_8(pagelist, 1); | |
4092 | ceph_pagelist_encode_8(pagelist, 1); | |
4093 | ceph_pagelist_encode_32(pagelist, sizeof(sr_rec)); | |
4094 | } | |
4095 | ||
4096 | dout(" adding snap realm %llx seq %lld parent %llx\n", | |
4097 | realm->ino, realm->seq, realm->parent_ino); | |
4098 | sr_rec.ino = cpu_to_le64(realm->ino); | |
4099 | sr_rec.seq = cpu_to_le64(realm->seq); | |
4100 | sr_rec.parent = cpu_to_le64(realm->parent_ino); | |
4101 | ||
4102 | err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec)); | |
4103 | if (err) | |
4104 | goto fail; | |
4105 | ||
4106 | recon_state->nr_realms++; | |
4107 | } | |
4108 | fail: | |
93cea5be | 4109 | return err; |
2f2dc053 SW |
4110 | } |
4111 | ||
4112 | ||
4113 | /* | |
4114 | * If an MDS fails and recovers, clients need to reconnect in order to | |
4115 | * reestablish shared state. This includes all caps issued through | |
4116 | * this session _and_ the snap_realm hierarchy. Because it's not | |
4117 | * clear which snap realms the mds cares about, we send everything we | |
4118 | * know about.. that ensures we'll then get any new info the | |
4119 | * recovering MDS might have. | |
4120 | * | |
4121 | * This is a relatively heavyweight operation, but it's rare. | |
2f2dc053 | 4122 | */ |
34b6c855 SW |
4123 | static void send_mds_reconnect(struct ceph_mds_client *mdsc, |
4124 | struct ceph_mds_session *session) | |
2f2dc053 | 4125 | { |
2f2dc053 | 4126 | struct ceph_msg *reply; |
34b6c855 | 4127 | int mds = session->s_mds; |
9abf82b8 | 4128 | int err = -ENOMEM; |
81c5a148 YZ |
4129 | struct ceph_reconnect_state recon_state = { |
4130 | .session = session, | |
4131 | }; | |
c8a96a31 | 4132 | LIST_HEAD(dispose); |
2f2dc053 | 4133 | |
34b6c855 | 4134 | pr_info("mds%d reconnect start\n", mds); |
2f2dc053 | 4135 | |
81c5a148 YZ |
4136 | recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS); |
4137 | if (!recon_state.pagelist) | |
93cea5be | 4138 | goto fail_nopagelist; |
93cea5be | 4139 | |
0d9c1ab3 | 4140 | reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false); |
a79832f2 | 4141 | if (!reply) |
93cea5be | 4142 | goto fail_nomsg; |
93cea5be | 4143 | |
d4846487 JL |
4144 | xa_destroy(&session->s_delegated_inos); |
4145 | ||
34b6c855 SW |
4146 | mutex_lock(&session->s_mutex); |
4147 | session->s_state = CEPH_MDS_SESSION_RECONNECTING; | |
4148 | session->s_seq = 0; | |
2f2dc053 | 4149 | |
2f2dc053 | 4150 | dout("session %p state %s\n", session, |
a687ecaf | 4151 | ceph_session_state_name(session->s_state)); |
2f2dc053 | 4152 | |
52d60f8e | 4153 | atomic_inc(&session->s_cap_gen); |
99a9c273 YZ |
4154 | |
4155 | spin_lock(&session->s_cap_lock); | |
03f4fcb0 YZ |
4156 | /* don't know if session is readonly */ |
4157 | session->s_readonly = 0; | |
99a9c273 YZ |
4158 | /* |
4159 | * notify __ceph_remove_cap() that we are composing cap reconnect. | |
4160 | * If a cap get released before being added to the cap reconnect, | |
4161 | * __ceph_remove_cap() should skip queuing cap release. | |
4162 | */ | |
4163 | session->s_cap_reconnect = 1; | |
e01a5946 | 4164 | /* drop old cap expires; we're about to reestablish that state */ |
c8a96a31 JL |
4165 | detach_cap_releases(session, &dispose); |
4166 | spin_unlock(&session->s_cap_lock); | |
4167 | dispose_cap_releases(mdsc, &dispose); | |
e01a5946 | 4168 | |
5d23371f | 4169 | /* trim unused caps to reduce MDS's cache rejoin time */ |
c0bd50e2 YZ |
4170 | if (mdsc->fsc->sb->s_root) |
4171 | shrink_dcache_parent(mdsc->fsc->sb->s_root); | |
5d23371f YZ |
4172 | |
4173 | ceph_con_close(&session->s_con); | |
4174 | ceph_con_open(&session->s_con, | |
4175 | CEPH_ENTITY_TYPE_MDS, mds, | |
4176 | ceph_mdsmap_get_addr(mdsc->mdsmap, mds)); | |
4177 | ||
4178 | /* replay unsafe requests */ | |
4179 | replay_unsafe_requests(mdsc, session); | |
4180 | ||
81c5a148 YZ |
4181 | ceph_early_kick_flushing_caps(mdsc, session); |
4182 | ||
5d23371f YZ |
4183 | down_read(&mdsc->snap_rwsem); |
4184 | ||
81c5a148 YZ |
4185 | /* placeholder for nr_caps */ |
4186 | err = ceph_pagelist_encode_32(recon_state.pagelist, 0); | |
93cea5be SW |
4187 | if (err) |
4188 | goto fail; | |
20cb34ae | 4189 | |
81c5a148 | 4190 | if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) { |
121f22a1 | 4191 | recon_state.msg_version = 3; |
81c5a148 YZ |
4192 | recon_state.allow_multi = true; |
4193 | } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) { | |
4194 | recon_state.msg_version = 3; | |
4195 | } else { | |
23c625ce | 4196 | recon_state.msg_version = 2; |
81c5a148 YZ |
4197 | } |
4198 | /* trsaverse this session's caps */ | |
a25949b9 | 4199 | err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state); |
2f2dc053 | 4200 | |
99a9c273 YZ |
4201 | spin_lock(&session->s_cap_lock); |
4202 | session->s_cap_reconnect = 0; | |
4203 | spin_unlock(&session->s_cap_lock); | |
4204 | ||
81c5a148 YZ |
4205 | if (err < 0) |
4206 | goto fail; | |
2f2dc053 | 4207 | |
81c5a148 YZ |
4208 | /* check if all realms can be encoded into current message */ |
4209 | if (mdsc->num_snap_realms) { | |
4210 | size_t total_len = | |
4211 | recon_state.pagelist->length + | |
4212 | mdsc->num_snap_realms * | |
4213 | sizeof(struct ceph_mds_snaprealm_reconnect); | |
4214 | if (recon_state.msg_version >= 4) { | |
4215 | /* number of realms */ | |
4216 | total_len += sizeof(u32); | |
4217 | /* version, compat_version and struct_len */ | |
4218 | total_len += mdsc->num_snap_realms * | |
4219 | (2 * sizeof(u8) + sizeof(u32)); | |
4220 | } | |
4221 | if (total_len > RECONNECT_MAX_SIZE) { | |
4222 | if (!recon_state.allow_multi) { | |
4223 | err = -ENOSPC; | |
4224 | goto fail; | |
4225 | } | |
4226 | if (recon_state.nr_caps) { | |
4227 | err = send_reconnect_partial(&recon_state); | |
4228 | if (err) | |
4229 | goto fail; | |
4230 | } | |
4231 | recon_state.msg_version = 5; | |
4232 | } | |
2f2dc053 | 4233 | } |
2f2dc053 | 4234 | |
81c5a148 YZ |
4235 | err = encode_snap_realms(mdsc, &recon_state); |
4236 | if (err < 0) | |
4237 | goto fail; | |
4238 | ||
4239 | if (recon_state.msg_version >= 5) { | |
4240 | err = ceph_pagelist_encode_8(recon_state.pagelist, 0); | |
4241 | if (err < 0) | |
4242 | goto fail; | |
4243 | } | |
44c99757 | 4244 | |
81c5a148 YZ |
4245 | if (recon_state.nr_caps || recon_state.nr_realms) { |
4246 | struct page *page = | |
4247 | list_first_entry(&recon_state.pagelist->head, | |
4248 | struct page, lru); | |
44c99757 | 4249 | __le32 *addr = kmap_atomic(page); |
81c5a148 YZ |
4250 | if (recon_state.nr_caps) { |
4251 | WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms); | |
4252 | *addr = cpu_to_le32(recon_state.nr_caps); | |
4253 | } else if (recon_state.msg_version >= 4) { | |
4254 | *(addr + 1) = cpu_to_le32(recon_state.nr_realms); | |
4255 | } | |
44c99757 | 4256 | kunmap_atomic(addr); |
ebf18f47 | 4257 | } |
44c99757 | 4258 | |
81c5a148 YZ |
4259 | reply->hdr.version = cpu_to_le16(recon_state.msg_version); |
4260 | if (recon_state.msg_version >= 4) | |
4261 | reply->hdr.compat_version = cpu_to_le16(4); | |
e548e9b9 | 4262 | |
81c5a148 YZ |
4263 | reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length); |
4264 | ceph_msg_data_add_pagelist(reply, recon_state.pagelist); | |
e548e9b9 | 4265 | |
2f2dc053 SW |
4266 | ceph_con_send(&session->s_con, reply); |
4267 | ||
9abf82b8 SW |
4268 | mutex_unlock(&session->s_mutex); |
4269 | ||
4270 | mutex_lock(&mdsc->mutex); | |
4271 | __wake_requests(mdsc, &session->s_waiting); | |
4272 | mutex_unlock(&mdsc->mutex); | |
4273 | ||
2f2dc053 | 4274 | up_read(&mdsc->snap_rwsem); |
81c5a148 | 4275 | ceph_pagelist_release(recon_state.pagelist); |
2f2dc053 SW |
4276 | return; |
4277 | ||
93cea5be | 4278 | fail: |
2f2dc053 | 4279 | ceph_msg_put(reply); |
9abf82b8 SW |
4280 | up_read(&mdsc->snap_rwsem); |
4281 | mutex_unlock(&session->s_mutex); | |
93cea5be | 4282 | fail_nomsg: |
81c5a148 | 4283 | ceph_pagelist_release(recon_state.pagelist); |
93cea5be | 4284 | fail_nopagelist: |
9abf82b8 | 4285 | pr_err("error %d preparing reconnect for mds%d\n", err, mds); |
9abf82b8 | 4286 | return; |
2f2dc053 SW |
4287 | } |
4288 | ||
4289 | ||
4290 | /* | |
4291 | * compare old and new mdsmaps, kicking requests | |
4292 | * and closing out old connections as necessary | |
4293 | * | |
4294 | * called under mdsc->mutex. | |
4295 | */ | |
4296 | static void check_new_map(struct ceph_mds_client *mdsc, | |
4297 | struct ceph_mdsmap *newmap, | |
4298 | struct ceph_mdsmap *oldmap) | |
4299 | { | |
d517b398 | 4300 | int i, j, err; |
2f2dc053 SW |
4301 | int oldstate, newstate; |
4302 | struct ceph_mds_session *s; | |
d517b398 | 4303 | unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0}; |
2f2dc053 SW |
4304 | |
4305 | dout("check_new_map new %u old %u\n", | |
4306 | newmap->m_epoch, oldmap->m_epoch); | |
4307 | ||
d517b398 XL |
4308 | if (newmap->m_info) { |
4309 | for (i = 0; i < newmap->possible_max_rank; i++) { | |
4310 | for (j = 0; j < newmap->m_info[i].num_export_targets; j++) | |
4311 | set_bit(newmap->m_info[i].export_targets[j], targets); | |
4312 | } | |
4313 | } | |
4314 | ||
b38c9eb4 | 4315 | for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) { |
d37b1d99 | 4316 | if (!mdsc->sessions[i]) |
2f2dc053 SW |
4317 | continue; |
4318 | s = mdsc->sessions[i]; | |
4319 | oldstate = ceph_mdsmap_get_state(oldmap, i); | |
4320 | newstate = ceph_mdsmap_get_state(newmap, i); | |
4321 | ||
0deb01c9 | 4322 | dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n", |
2f2dc053 | 4323 | i, ceph_mds_state_name(oldstate), |
0deb01c9 | 4324 | ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "", |
2f2dc053 | 4325 | ceph_mds_state_name(newstate), |
0deb01c9 | 4326 | ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "", |
a687ecaf | 4327 | ceph_session_state_name(s->s_state)); |
2f2dc053 | 4328 | |
b38c9eb4 | 4329 | if (i >= newmap->possible_max_rank) { |
6f0f597b | 4330 | /* force close session for stopped mds */ |
5b3248c6 | 4331 | ceph_get_mds_session(s); |
6f0f597b YZ |
4332 | __unregister_session(mdsc, s); |
4333 | __wake_requests(mdsc, &s->s_waiting); | |
4334 | mutex_unlock(&mdsc->mutex); | |
2827528d | 4335 | |
6f0f597b YZ |
4336 | mutex_lock(&s->s_mutex); |
4337 | cleanup_session_requests(mdsc, s); | |
4338 | remove_session_caps(s); | |
4339 | mutex_unlock(&s->s_mutex); | |
2827528d | 4340 | |
6f0f597b | 4341 | ceph_put_mds_session(s); |
2827528d | 4342 | |
6f0f597b YZ |
4343 | mutex_lock(&mdsc->mutex); |
4344 | kick_requests(mdsc, i); | |
4345 | continue; | |
4346 | } | |
4347 | ||
4348 | if (memcmp(ceph_mdsmap_get_addr(oldmap, i), | |
4349 | ceph_mdsmap_get_addr(newmap, i), | |
4350 | sizeof(struct ceph_entity_addr))) { | |
4351 | /* just close it */ | |
4352 | mutex_unlock(&mdsc->mutex); | |
4353 | mutex_lock(&s->s_mutex); | |
4354 | mutex_lock(&mdsc->mutex); | |
4355 | ceph_con_close(&s->s_con); | |
4356 | mutex_unlock(&s->s_mutex); | |
4357 | s->s_state = CEPH_MDS_SESSION_RESTARTING; | |
2f2dc053 SW |
4358 | } else if (oldstate == newstate) { |
4359 | continue; /* nothing new with this mds */ | |
4360 | } | |
4361 | ||
4362 | /* | |
4363 | * send reconnect? | |
4364 | */ | |
4365 | if (s->s_state == CEPH_MDS_SESSION_RESTARTING && | |
34b6c855 SW |
4366 | newstate >= CEPH_MDS_STATE_RECONNECT) { |
4367 | mutex_unlock(&mdsc->mutex); | |
d517b398 | 4368 | clear_bit(i, targets); |
34b6c855 SW |
4369 | send_mds_reconnect(mdsc, s); |
4370 | mutex_lock(&mdsc->mutex); | |
4371 | } | |
2f2dc053 SW |
4372 | |
4373 | /* | |
29790f26 | 4374 | * kick request on any mds that has gone active. |
2f2dc053 SW |
4375 | */ |
4376 | if (oldstate < CEPH_MDS_STATE_ACTIVE && | |
4377 | newstate >= CEPH_MDS_STATE_ACTIVE) { | |
29790f26 SW |
4378 | if (oldstate != CEPH_MDS_STATE_CREATING && |
4379 | oldstate != CEPH_MDS_STATE_STARTING) | |
4380 | pr_info("mds%d recovery completed\n", s->s_mds); | |
4381 | kick_requests(mdsc, i); | |
ea8412b2 | 4382 | mutex_unlock(&mdsc->mutex); |
829ad4db | 4383 | mutex_lock(&s->s_mutex); |
ea8412b2 | 4384 | mutex_lock(&mdsc->mutex); |
2f2dc053 | 4385 | ceph_kick_flushing_caps(mdsc, s); |
829ad4db | 4386 | mutex_unlock(&s->s_mutex); |
d2f8bb27 | 4387 | wake_up_session_caps(s, RECONNECT); |
2f2dc053 SW |
4388 | } |
4389 | } | |
cb170a22 | 4390 | |
d517b398 XL |
4391 | /* |
4392 | * Only open and reconnect sessions that don't exist yet. | |
4393 | */ | |
4394 | for (i = 0; i < newmap->possible_max_rank; i++) { | |
4395 | /* | |
4396 | * In case the import MDS is crashed just after | |
4397 | * the EImportStart journal is flushed, so when | |
4398 | * a standby MDS takes over it and is replaying | |
4399 | * the EImportStart journal the new MDS daemon | |
4400 | * will wait the client to reconnect it, but the | |
4401 | * client may never register/open the session yet. | |
4402 | * | |
4403 | * Will try to reconnect that MDS daemon if the | |
4404 | * rank number is in the export targets array and | |
4405 | * is the up:reconnect state. | |
4406 | */ | |
4407 | newstate = ceph_mdsmap_get_state(newmap, i); | |
4408 | if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT) | |
4409 | continue; | |
4410 | ||
4411 | /* | |
4412 | * The session maybe registered and opened by some | |
4413 | * requests which were choosing random MDSes during | |
4414 | * the mdsc->mutex's unlock/lock gap below in rare | |
4415 | * case. But the related MDS daemon will just queue | |
4416 | * that requests and be still waiting for the client's | |
4417 | * reconnection request in up:reconnect state. | |
4418 | */ | |
4419 | s = __ceph_lookup_mds_session(mdsc, i); | |
4420 | if (likely(!s)) { | |
4421 | s = __open_export_target_session(mdsc, i); | |
4422 | if (IS_ERR(s)) { | |
4423 | err = PTR_ERR(s); | |
4424 | pr_err("failed to open export target session, err %d\n", | |
4425 | err); | |
4426 | continue; | |
4427 | } | |
4428 | } | |
4429 | dout("send reconnect to export target mds.%d\n", i); | |
4430 | mutex_unlock(&mdsc->mutex); | |
4431 | send_mds_reconnect(mdsc, s); | |
4432 | ceph_put_mds_session(s); | |
4433 | mutex_lock(&mdsc->mutex); | |
4434 | } | |
4435 | ||
b38c9eb4 | 4436 | for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) { |
cb170a22 SW |
4437 | s = mdsc->sessions[i]; |
4438 | if (!s) | |
4439 | continue; | |
4440 | if (!ceph_mdsmap_is_laggy(newmap, i)) | |
4441 | continue; | |
4442 | if (s->s_state == CEPH_MDS_SESSION_OPEN || | |
4443 | s->s_state == CEPH_MDS_SESSION_HUNG || | |
4444 | s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
4445 | dout(" connecting to export targets of laggy mds%d\n", | |
4446 | i); | |
4447 | __open_export_target_sessions(mdsc, s); | |
4448 | } | |
4449 | } | |
2f2dc053 SW |
4450 | } |
4451 | ||
4452 | ||
4453 | ||
4454 | /* | |
4455 | * leases | |
4456 | */ | |
4457 | ||
4458 | /* | |
4459 | * caller must hold session s_mutex, dentry->d_lock | |
4460 | */ | |
4461 | void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry) | |
4462 | { | |
4463 | struct ceph_dentry_info *di = ceph_dentry(dentry); | |
4464 | ||
4465 | ceph_put_mds_session(di->lease_session); | |
4466 | di->lease_session = NULL; | |
4467 | } | |
4468 | ||
2600d2dd SW |
4469 | static void handle_lease(struct ceph_mds_client *mdsc, |
4470 | struct ceph_mds_session *session, | |
4471 | struct ceph_msg *msg) | |
2f2dc053 | 4472 | { |
3d14c5d2 | 4473 | struct super_block *sb = mdsc->fsc->sb; |
2f2dc053 | 4474 | struct inode *inode; |
2f2dc053 SW |
4475 | struct dentry *parent, *dentry; |
4476 | struct ceph_dentry_info *di; | |
2600d2dd | 4477 | int mds = session->s_mds; |
2f2dc053 | 4478 | struct ceph_mds_lease *h = msg->front.iov_base; |
1e5ea23d | 4479 | u32 seq; |
2f2dc053 | 4480 | struct ceph_vino vino; |
2f2dc053 SW |
4481 | struct qstr dname; |
4482 | int release = 0; | |
4483 | ||
2f2dc053 SW |
4484 | dout("handle_lease from mds%d\n", mds); |
4485 | ||
4486 | /* decode */ | |
4487 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32)) | |
4488 | goto bad; | |
4489 | vino.ino = le64_to_cpu(h->ino); | |
4490 | vino.snap = CEPH_NOSNAP; | |
1e5ea23d | 4491 | seq = le32_to_cpu(h->seq); |
0fcf6c02 YZ |
4492 | dname.len = get_unaligned_le32(h + 1); |
4493 | if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len) | |
2f2dc053 | 4494 | goto bad; |
0fcf6c02 | 4495 | dname.name = (void *)(h + 1) + sizeof(u32); |
2f2dc053 | 4496 | |
2f2dc053 SW |
4497 | /* lookup inode */ |
4498 | inode = ceph_find_inode(sb, vino); | |
2f90b852 SW |
4499 | dout("handle_lease %s, ino %llx %p %.*s\n", |
4500 | ceph_lease_op_name(h->action), vino.ino, inode, | |
1e5ea23d | 4501 | dname.len, dname.name); |
6cd3bcad YZ |
4502 | |
4503 | mutex_lock(&session->s_mutex); | |
62575e27 | 4504 | inc_session_sequence(session); |
6cd3bcad | 4505 | |
d37b1d99 | 4506 | if (!inode) { |
2f2dc053 SW |
4507 | dout("handle_lease no inode %llx\n", vino.ino); |
4508 | goto release; | |
4509 | } | |
2f2dc053 SW |
4510 | |
4511 | /* dentry */ | |
4512 | parent = d_find_alias(inode); | |
4513 | if (!parent) { | |
4514 | dout("no parent dentry on inode %p\n", inode); | |
4515 | WARN_ON(1); | |
4516 | goto release; /* hrm... */ | |
4517 | } | |
8387ff25 | 4518 | dname.hash = full_name_hash(parent, dname.name, dname.len); |
2f2dc053 SW |
4519 | dentry = d_lookup(parent, &dname); |
4520 | dput(parent); | |
4521 | if (!dentry) | |
4522 | goto release; | |
4523 | ||
4524 | spin_lock(&dentry->d_lock); | |
4525 | di = ceph_dentry(dentry); | |
4526 | switch (h->action) { | |
4527 | case CEPH_MDS_LEASE_REVOKE: | |
3d8eb7a9 | 4528 | if (di->lease_session == session) { |
1e5ea23d SW |
4529 | if (ceph_seq_cmp(di->lease_seq, seq) > 0) |
4530 | h->seq = cpu_to_le32(di->lease_seq); | |
2f2dc053 SW |
4531 | __ceph_mdsc_drop_dentry_lease(dentry); |
4532 | } | |
4533 | release = 1; | |
4534 | break; | |
4535 | ||
4536 | case CEPH_MDS_LEASE_RENEW: | |
3d8eb7a9 | 4537 | if (di->lease_session == session && |
52d60f8e | 4538 | di->lease_gen == atomic_read(&session->s_cap_gen) && |
2f2dc053 SW |
4539 | di->lease_renew_from && |
4540 | di->lease_renew_after == 0) { | |
4541 | unsigned long duration = | |
3563dbdd | 4542 | msecs_to_jiffies(le32_to_cpu(h->duration_ms)); |
2f2dc053 | 4543 | |
1e5ea23d | 4544 | di->lease_seq = seq; |
9b16f03c | 4545 | di->time = di->lease_renew_from + duration; |
2f2dc053 SW |
4546 | di->lease_renew_after = di->lease_renew_from + |
4547 | (duration >> 1); | |
4548 | di->lease_renew_from = 0; | |
4549 | } | |
4550 | break; | |
4551 | } | |
4552 | spin_unlock(&dentry->d_lock); | |
4553 | dput(dentry); | |
4554 | ||
4555 | if (!release) | |
4556 | goto out; | |
4557 | ||
4558 | release: | |
4559 | /* let's just reuse the same message */ | |
4560 | h->action = CEPH_MDS_LEASE_REVOKE_ACK; | |
4561 | ceph_msg_get(msg); | |
4562 | ceph_con_send(&session->s_con, msg); | |
4563 | ||
4564 | out: | |
2f2dc053 | 4565 | mutex_unlock(&session->s_mutex); |
23c2c76e | 4566 | iput(inode); |
2f2dc053 SW |
4567 | return; |
4568 | ||
4569 | bad: | |
4570 | pr_err("corrupt lease message\n"); | |
9ec7cab1 | 4571 | ceph_msg_dump(msg); |
2f2dc053 SW |
4572 | } |
4573 | ||
4574 | void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, | |
2f2dc053 SW |
4575 | struct dentry *dentry, char action, |
4576 | u32 seq) | |
4577 | { | |
4578 | struct ceph_msg *msg; | |
4579 | struct ceph_mds_lease *lease; | |
8f2a98ef YZ |
4580 | struct inode *dir; |
4581 | int len = sizeof(*lease) + sizeof(u32) + NAME_MAX; | |
2f2dc053 | 4582 | |
8f2a98ef YZ |
4583 | dout("lease_send_msg identry %p %s to mds%d\n", |
4584 | dentry, ceph_lease_op_name(action), session->s_mds); | |
2f2dc053 | 4585 | |
b61c2763 | 4586 | msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false); |
a79832f2 | 4587 | if (!msg) |
2f2dc053 SW |
4588 | return; |
4589 | lease = msg->front.iov_base; | |
4590 | lease->action = action; | |
2f2dc053 | 4591 | lease->seq = cpu_to_le32(seq); |
2f2dc053 | 4592 | |
8f2a98ef YZ |
4593 | spin_lock(&dentry->d_lock); |
4594 | dir = d_inode(dentry->d_parent); | |
4595 | lease->ino = cpu_to_le64(ceph_ino(dir)); | |
4596 | lease->first = lease->last = cpu_to_le64(ceph_snap(dir)); | |
4597 | ||
4598 | put_unaligned_le32(dentry->d_name.len, lease + 1); | |
4599 | memcpy((void *)(lease + 1) + 4, | |
4600 | dentry->d_name.name, dentry->d_name.len); | |
4601 | spin_unlock(&dentry->d_lock); | |
2f2dc053 SW |
4602 | |
4603 | ceph_con_send(&session->s_con, msg); | |
4604 | } | |
4605 | ||
2f2dc053 | 4606 | /* |
59b312f3 | 4607 | * lock unlock the session, to wait ongoing session activities |
2f2dc053 | 4608 | */ |
59b312f3 | 4609 | static void lock_unlock_session(struct ceph_mds_session *s) |
2f2dc053 | 4610 | { |
59b312f3 XL |
4611 | mutex_lock(&s->s_mutex); |
4612 | mutex_unlock(&s->s_mutex); | |
2f2dc053 SW |
4613 | } |
4614 | ||
131d7eb4 YZ |
4615 | static void maybe_recover_session(struct ceph_mds_client *mdsc) |
4616 | { | |
4617 | struct ceph_fs_client *fsc = mdsc->fsc; | |
4618 | ||
4619 | if (!ceph_test_mount_opt(fsc, CLEANRECOVER)) | |
4620 | return; | |
2f2dc053 | 4621 | |
131d7eb4 YZ |
4622 | if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED) |
4623 | return; | |
4624 | ||
0b98acd6 | 4625 | if (!READ_ONCE(fsc->blocklisted)) |
131d7eb4 YZ |
4626 | return; |
4627 | ||
0b98acd6 | 4628 | pr_info("auto reconnect after blocklisted\n"); |
131d7eb4 YZ |
4629 | ceph_force_reconnect(fsc->sb); |
4630 | } | |
2f2dc053 | 4631 | |
3e699bd8 XL |
4632 | bool check_session_state(struct ceph_mds_session *s) |
4633 | { | |
62575e27 JL |
4634 | switch (s->s_state) { |
4635 | case CEPH_MDS_SESSION_OPEN: | |
4636 | if (s->s_ttl && time_after(jiffies, s->s_ttl)) { | |
3e699bd8 XL |
4637 | s->s_state = CEPH_MDS_SESSION_HUNG; |
4638 | pr_info("mds%d hung\n", s->s_mds); | |
4639 | } | |
62575e27 JL |
4640 | break; |
4641 | case CEPH_MDS_SESSION_CLOSING: | |
62575e27 JL |
4642 | case CEPH_MDS_SESSION_NEW: |
4643 | case CEPH_MDS_SESSION_RESTARTING: | |
4644 | case CEPH_MDS_SESSION_CLOSED: | |
4645 | case CEPH_MDS_SESSION_REJECTED: | |
3e699bd8 | 4646 | return false; |
62575e27 | 4647 | } |
3e699bd8 XL |
4648 | |
4649 | return true; | |
4650 | } | |
4651 | ||
62575e27 JL |
4652 | /* |
4653 | * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply, | |
4654 | * then we need to retransmit that request. | |
4655 | */ | |
4656 | void inc_session_sequence(struct ceph_mds_session *s) | |
4657 | { | |
4658 | lockdep_assert_held(&s->s_mutex); | |
4659 | ||
4660 | s->s_seq++; | |
4661 | ||
4662 | if (s->s_state == CEPH_MDS_SESSION_CLOSING) { | |
4663 | int ret; | |
4664 | ||
4665 | dout("resending session close request for mds%d\n", s->s_mds); | |
4666 | ret = request_close_session(s); | |
4667 | if (ret < 0) | |
4668 | pr_err("unable to close session to mds%d: %d\n", | |
4669 | s->s_mds, ret); | |
4670 | } | |
4671 | } | |
4672 | ||
2f2dc053 | 4673 | /* |
bf2ba432 LH |
4674 | * delayed work -- periodically trim expired leases, renew caps with mds. If |
4675 | * the @delay parameter is set to 0 or if it's more than 5 secs, the default | |
4676 | * workqueue delay value of 5 secs will be used. | |
2f2dc053 | 4677 | */ |
bf2ba432 | 4678 | static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay) |
2f2dc053 | 4679 | { |
bf2ba432 LH |
4680 | unsigned long max_delay = HZ * 5; |
4681 | ||
4682 | /* 5 secs default delay */ | |
4683 | if (!delay || (delay > max_delay)) | |
4684 | delay = max_delay; | |
4685 | schedule_delayed_work(&mdsc->delayed_work, | |
4686 | round_jiffies_relative(delay)); | |
2f2dc053 SW |
4687 | } |
4688 | ||
4689 | static void delayed_work(struct work_struct *work) | |
4690 | { | |
2f2dc053 SW |
4691 | struct ceph_mds_client *mdsc = |
4692 | container_of(work, struct ceph_mds_client, delayed_work.work); | |
bf2ba432 | 4693 | unsigned long delay; |
2f2dc053 SW |
4694 | int renew_interval; |
4695 | int renew_caps; | |
bf2ba432 | 4696 | int i; |
2f2dc053 SW |
4697 | |
4698 | dout("mdsc delayed_work\n"); | |
75c9627e | 4699 | |
fa996773 XL |
4700 | if (mdsc->stopping) |
4701 | return; | |
4702 | ||
2f2dc053 SW |
4703 | mutex_lock(&mdsc->mutex); |
4704 | renew_interval = mdsc->mdsmap->m_session_timeout >> 2; | |
4705 | renew_caps = time_after_eq(jiffies, HZ*renew_interval + | |
4706 | mdsc->last_renew_caps); | |
4707 | if (renew_caps) | |
4708 | mdsc->last_renew_caps = jiffies; | |
4709 | ||
4710 | for (i = 0; i < mdsc->max_sessions; i++) { | |
4711 | struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i); | |
d37b1d99 | 4712 | if (!s) |
2f2dc053 | 4713 | continue; |
3e699bd8 XL |
4714 | |
4715 | if (!check_session_state(s)) { | |
2f2dc053 SW |
4716 | ceph_put_mds_session(s); |
4717 | continue; | |
4718 | } | |
4719 | mutex_unlock(&mdsc->mutex); | |
4720 | ||
4721 | mutex_lock(&s->s_mutex); | |
4722 | if (renew_caps) | |
4723 | send_renew_caps(mdsc, s); | |
4724 | else | |
4725 | ceph_con_keepalive(&s->s_con); | |
aab53dd9 SW |
4726 | if (s->s_state == CEPH_MDS_SESSION_OPEN || |
4727 | s->s_state == CEPH_MDS_SESSION_HUNG) | |
3d7ded4d | 4728 | ceph_send_cap_releases(mdsc, s); |
2f2dc053 SW |
4729 | mutex_unlock(&s->s_mutex); |
4730 | ceph_put_mds_session(s); | |
4731 | ||
4732 | mutex_lock(&mdsc->mutex); | |
4733 | } | |
4734 | mutex_unlock(&mdsc->mutex); | |
4735 | ||
bf2ba432 | 4736 | delay = ceph_check_delayed_caps(mdsc); |
37c4efc1 YZ |
4737 | |
4738 | ceph_queue_cap_reclaim_work(mdsc); | |
4739 | ||
4740 | ceph_trim_snapid_map(mdsc); | |
4741 | ||
131d7eb4 YZ |
4742 | maybe_recover_session(mdsc); |
4743 | ||
bf2ba432 | 4744 | schedule_delayed(mdsc, delay); |
2f2dc053 SW |
4745 | } |
4746 | ||
3d14c5d2 | 4747 | int ceph_mdsc_init(struct ceph_fs_client *fsc) |
2f2dc053 | 4748 | |
2f2dc053 | 4749 | { |
3d14c5d2 | 4750 | struct ceph_mds_client *mdsc; |
f9009efa | 4751 | int err; |
3d14c5d2 YS |
4752 | |
4753 | mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS); | |
4754 | if (!mdsc) | |
4755 | return -ENOMEM; | |
4756 | mdsc->fsc = fsc; | |
2f2dc053 SW |
4757 | mutex_init(&mdsc->mutex); |
4758 | mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS); | |
d37b1d99 | 4759 | if (!mdsc->mdsmap) { |
f9009efa XL |
4760 | err = -ENOMEM; |
4761 | goto err_mdsc; | |
fb3101b6 | 4762 | } |
2d06eeb8 | 4763 | |
2f2dc053 | 4764 | init_completion(&mdsc->safe_umount_waiters); |
f3c60c59 | 4765 | init_waitqueue_head(&mdsc->session_close_wq); |
2f2dc053 | 4766 | INIT_LIST_HEAD(&mdsc->waiting_for_map); |
0c44a8e0 LH |
4767 | mdsc->quotarealms_inodes = RB_ROOT; |
4768 | mutex_init(&mdsc->quotarealms_inodes_mutex); | |
2f2dc053 | 4769 | init_rwsem(&mdsc->snap_rwsem); |
a105f00c | 4770 | mdsc->snap_realms = RB_ROOT; |
2f2dc053 SW |
4771 | INIT_LIST_HEAD(&mdsc->snap_empty); |
4772 | spin_lock_init(&mdsc->snap_empty_lock); | |
44ca18f2 | 4773 | mdsc->request_tree = RB_ROOT; |
2f2dc053 SW |
4774 | INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work); |
4775 | mdsc->last_renew_caps = jiffies; | |
4776 | INIT_LIST_HEAD(&mdsc->cap_delay_list); | |
3a3430af | 4777 | INIT_LIST_HEAD(&mdsc->cap_wait_list); |
2f2dc053 SW |
4778 | spin_lock_init(&mdsc->cap_delay_lock); |
4779 | INIT_LIST_HEAD(&mdsc->snap_flush_list); | |
4780 | spin_lock_init(&mdsc->snap_flush_lock); | |
553adfd9 | 4781 | mdsc->last_cap_flush_tid = 1; |
e4500b5e | 4782 | INIT_LIST_HEAD(&mdsc->cap_flush_list); |
db354052 | 4783 | INIT_LIST_HEAD(&mdsc->cap_dirty_migrating); |
2f2dc053 SW |
4784 | spin_lock_init(&mdsc->cap_dirty_lock); |
4785 | init_waitqueue_head(&mdsc->cap_flushing_wq); | |
37c4efc1 | 4786 | INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work); |
f9009efa XL |
4787 | err = ceph_metric_init(&mdsc->metric); |
4788 | if (err) | |
4789 | goto err_mdsmap; | |
37c4efc1 YZ |
4790 | |
4791 | spin_lock_init(&mdsc->dentry_list_lock); | |
4792 | INIT_LIST_HEAD(&mdsc->dentry_leases); | |
4793 | INIT_LIST_HEAD(&mdsc->dentry_dir_leases); | |
2d06eeb8 | 4794 | |
37151668 | 4795 | ceph_caps_init(mdsc); |
fe33032d | 4796 | ceph_adjust_caps_max_min(mdsc, fsc->mount_options); |
37151668 | 4797 | |
75c9627e YZ |
4798 | spin_lock_init(&mdsc->snapid_map_lock); |
4799 | mdsc->snapid_map_tree = RB_ROOT; | |
4800 | INIT_LIST_HEAD(&mdsc->snapid_map_lru); | |
4801 | ||
10183a69 YZ |
4802 | init_rwsem(&mdsc->pool_perm_rwsem); |
4803 | mdsc->pool_perm_tree = RB_ROOT; | |
4804 | ||
dfeb84d4 YZ |
4805 | strscpy(mdsc->nodename, utsname()->nodename, |
4806 | sizeof(mdsc->nodename)); | |
a7caa88f XL |
4807 | |
4808 | fsc->mdsc = mdsc; | |
5f44f142 | 4809 | return 0; |
f9009efa XL |
4810 | |
4811 | err_mdsmap: | |
4812 | kfree(mdsc->mdsmap); | |
4813 | err_mdsc: | |
4814 | kfree(mdsc); | |
4815 | return err; | |
2f2dc053 SW |
4816 | } |
4817 | ||
4818 | /* | |
4819 | * Wait for safe replies on open mds requests. If we time out, drop | |
4820 | * all requests from the tree to avoid dangling dentry refs. | |
4821 | */ | |
4822 | static void wait_requests(struct ceph_mds_client *mdsc) | |
4823 | { | |
a319bf56 | 4824 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 | 4825 | struct ceph_mds_request *req; |
2f2dc053 SW |
4826 | |
4827 | mutex_lock(&mdsc->mutex); | |
44ca18f2 | 4828 | if (__get_oldest_req(mdsc)) { |
2f2dc053 | 4829 | mutex_unlock(&mdsc->mutex); |
44ca18f2 | 4830 | |
2f2dc053 SW |
4831 | dout("wait_requests waiting for requests\n"); |
4832 | wait_for_completion_timeout(&mdsc->safe_umount_waiters, | |
a319bf56 | 4833 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
4834 | |
4835 | /* tear down remaining requests */ | |
44ca18f2 SW |
4836 | mutex_lock(&mdsc->mutex); |
4837 | while ((req = __get_oldest_req(mdsc))) { | |
2f2dc053 SW |
4838 | dout("wait_requests timed out on tid %llu\n", |
4839 | req->r_tid); | |
428138c9 | 4840 | list_del_init(&req->r_wait); |
44ca18f2 | 4841 | __unregister_request(mdsc, req); |
2f2dc053 SW |
4842 | } |
4843 | } | |
4844 | mutex_unlock(&mdsc->mutex); | |
4845 | dout("wait_requests done\n"); | |
4846 | } | |
4847 | ||
d095559c XL |
4848 | void send_flush_mdlog(struct ceph_mds_session *s) |
4849 | { | |
4850 | struct ceph_msg *msg; | |
4851 | ||
4852 | /* | |
4853 | * Pre-luminous MDS crashes when it sees an unknown session request | |
4854 | */ | |
4855 | if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS)) | |
4856 | return; | |
4857 | ||
4858 | mutex_lock(&s->s_mutex); | |
4859 | dout("request mdlog flush to mds%d (%s)s seq %lld\n", s->s_mds, | |
4860 | ceph_session_state_name(s->s_state), s->s_seq); | |
4861 | msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG, | |
4862 | s->s_seq); | |
4863 | if (!msg) { | |
4864 | pr_err("failed to request mdlog flush to mds%d (%s) seq %lld\n", | |
4865 | s->s_mds, ceph_session_state_name(s->s_state), s->s_seq); | |
4866 | } else { | |
4867 | ceph_con_send(&s->s_con, msg); | |
4868 | } | |
4869 | mutex_unlock(&s->s_mutex); | |
4870 | } | |
4871 | ||
2f2dc053 SW |
4872 | /* |
4873 | * called before mount is ro, and before dentries are torn down. | |
4874 | * (hmm, does this still race with new lookups?) | |
4875 | */ | |
4876 | void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc) | |
4877 | { | |
4878 | dout("pre_umount\n"); | |
4879 | mdsc->stopping = 1; | |
4880 | ||
d095559c | 4881 | ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true); |
59b312f3 | 4882 | ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false); |
afcdaea3 | 4883 | ceph_flush_dirty_caps(mdsc); |
2f2dc053 | 4884 | wait_requests(mdsc); |
17c688c3 SW |
4885 | |
4886 | /* | |
4887 | * wait for reply handlers to drop their request refs and | |
4888 | * their inode/dcache refs | |
4889 | */ | |
4890 | ceph_msgr_flush(); | |
0c44a8e0 LH |
4891 | |
4892 | ceph_cleanup_quotarealms_inodes(mdsc); | |
2f2dc053 SW |
4893 | } |
4894 | ||
4895 | /* | |
1b2ba3c5 | 4896 | * flush the mdlog and wait for all write mds requests to flush. |
2f2dc053 | 4897 | */ |
1b2ba3c5 XL |
4898 | static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc, |
4899 | u64 want_tid) | |
2f2dc053 | 4900 | { |
80fc7314 | 4901 | struct ceph_mds_request *req = NULL, *nextreq; |
1b2ba3c5 | 4902 | struct ceph_mds_session *last_session = NULL; |
44ca18f2 | 4903 | struct rb_node *n; |
2f2dc053 SW |
4904 | |
4905 | mutex_lock(&mdsc->mutex); | |
1b2ba3c5 | 4906 | dout("%s want %lld\n", __func__, want_tid); |
80fc7314 | 4907 | restart: |
44ca18f2 SW |
4908 | req = __get_oldest_req(mdsc); |
4909 | while (req && req->r_tid <= want_tid) { | |
80fc7314 SW |
4910 | /* find next request */ |
4911 | n = rb_next(&req->r_node); | |
4912 | if (n) | |
4913 | nextreq = rb_entry(n, struct ceph_mds_request, r_node); | |
4914 | else | |
4915 | nextreq = NULL; | |
e8a7b8b1 YZ |
4916 | if (req->r_op != CEPH_MDS_OP_SETFILELOCK && |
4917 | (req->r_op & CEPH_MDS_OP_WRITE)) { | |
1b2ba3c5 XL |
4918 | struct ceph_mds_session *s = req->r_session; |
4919 | ||
4920 | if (!s) { | |
4921 | req = nextreq; | |
4922 | continue; | |
4923 | } | |
4924 | ||
44ca18f2 SW |
4925 | /* write op */ |
4926 | ceph_mdsc_get_request(req); | |
80fc7314 SW |
4927 | if (nextreq) |
4928 | ceph_mdsc_get_request(nextreq); | |
1b2ba3c5 | 4929 | s = ceph_get_mds_session(s); |
44ca18f2 | 4930 | mutex_unlock(&mdsc->mutex); |
1b2ba3c5 XL |
4931 | |
4932 | /* send flush mdlog request to MDS */ | |
4933 | if (last_session != s) { | |
4934 | send_flush_mdlog(s); | |
4935 | ceph_put_mds_session(last_session); | |
4936 | last_session = s; | |
4937 | } else { | |
4938 | ceph_put_mds_session(s); | |
4939 | } | |
4940 | dout("%s wait on %llu (want %llu)\n", __func__, | |
44ca18f2 SW |
4941 | req->r_tid, want_tid); |
4942 | wait_for_completion(&req->r_safe_completion); | |
1b2ba3c5 | 4943 | |
44ca18f2 | 4944 | mutex_lock(&mdsc->mutex); |
44ca18f2 | 4945 | ceph_mdsc_put_request(req); |
80fc7314 SW |
4946 | if (!nextreq) |
4947 | break; /* next dne before, so we're done! */ | |
4948 | if (RB_EMPTY_NODE(&nextreq->r_node)) { | |
4949 | /* next request was removed from tree */ | |
4950 | ceph_mdsc_put_request(nextreq); | |
4951 | goto restart; | |
4952 | } | |
4953 | ceph_mdsc_put_request(nextreq); /* won't go away */ | |
44ca18f2 | 4954 | } |
80fc7314 | 4955 | req = nextreq; |
2f2dc053 SW |
4956 | } |
4957 | mutex_unlock(&mdsc->mutex); | |
1b2ba3c5 XL |
4958 | ceph_put_mds_session(last_session); |
4959 | dout("%s done\n", __func__); | |
2f2dc053 SW |
4960 | } |
4961 | ||
4962 | void ceph_mdsc_sync(struct ceph_mds_client *mdsc) | |
4963 | { | |
0e294387 | 4964 | u64 want_tid, want_flush; |
2f2dc053 | 4965 | |
50c9132d | 4966 | if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) |
56b7cf95 SW |
4967 | return; |
4968 | ||
2f2dc053 SW |
4969 | dout("sync\n"); |
4970 | mutex_lock(&mdsc->mutex); | |
4971 | want_tid = mdsc->last_tid; | |
2f2dc053 | 4972 | mutex_unlock(&mdsc->mutex); |
2f2dc053 | 4973 | |
afcdaea3 | 4974 | ceph_flush_dirty_caps(mdsc); |
d3383a8e | 4975 | spin_lock(&mdsc->cap_dirty_lock); |
8310b089 | 4976 | want_flush = mdsc->last_cap_flush_tid; |
c8799fc4 YZ |
4977 | if (!list_empty(&mdsc->cap_flush_list)) { |
4978 | struct ceph_cap_flush *cf = | |
4979 | list_last_entry(&mdsc->cap_flush_list, | |
4980 | struct ceph_cap_flush, g_list); | |
4981 | cf->wake = true; | |
4982 | } | |
d3383a8e YZ |
4983 | spin_unlock(&mdsc->cap_dirty_lock); |
4984 | ||
0e294387 YZ |
4985 | dout("sync want tid %lld flush_seq %lld\n", |
4986 | want_tid, want_flush); | |
2f2dc053 | 4987 | |
1b2ba3c5 | 4988 | flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid); |
0e294387 | 4989 | wait_caps_flush(mdsc, want_flush); |
2f2dc053 SW |
4990 | } |
4991 | ||
f3c60c59 SW |
4992 | /* |
4993 | * true if all sessions are closed, or we force unmount | |
4994 | */ | |
fcff415c | 4995 | static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped) |
f3c60c59 | 4996 | { |
52953d55 | 4997 | if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) |
f3c60c59 | 4998 | return true; |
fcff415c | 4999 | return atomic_read(&mdsc->num_sessions) <= skipped; |
f3c60c59 | 5000 | } |
2f2dc053 SW |
5001 | |
5002 | /* | |
5003 | * called after sb is ro. | |
5004 | */ | |
5005 | void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc) | |
5006 | { | |
a319bf56 | 5007 | struct ceph_options *opts = mdsc->fsc->client->options; |
2f2dc053 SW |
5008 | struct ceph_mds_session *session; |
5009 | int i; | |
fcff415c | 5010 | int skipped = 0; |
2f2dc053 SW |
5011 | |
5012 | dout("close_sessions\n"); | |
5013 | ||
2f2dc053 | 5014 | /* close sessions */ |
f3c60c59 SW |
5015 | mutex_lock(&mdsc->mutex); |
5016 | for (i = 0; i < mdsc->max_sessions; i++) { | |
5017 | session = __ceph_lookup_mds_session(mdsc, i); | |
5018 | if (!session) | |
5019 | continue; | |
2f2dc053 | 5020 | mutex_unlock(&mdsc->mutex); |
f3c60c59 | 5021 | mutex_lock(&session->s_mutex); |
fcff415c YZ |
5022 | if (__close_session(mdsc, session) <= 0) |
5023 | skipped++; | |
f3c60c59 SW |
5024 | mutex_unlock(&session->s_mutex); |
5025 | ceph_put_mds_session(session); | |
2f2dc053 SW |
5026 | mutex_lock(&mdsc->mutex); |
5027 | } | |
f3c60c59 SW |
5028 | mutex_unlock(&mdsc->mutex); |
5029 | ||
5030 | dout("waiting for sessions to close\n"); | |
fcff415c YZ |
5031 | wait_event_timeout(mdsc->session_close_wq, |
5032 | done_closing_sessions(mdsc, skipped), | |
a319bf56 | 5033 | ceph_timeout_jiffies(opts->mount_timeout)); |
2f2dc053 SW |
5034 | |
5035 | /* tear down remaining sessions */ | |
f3c60c59 | 5036 | mutex_lock(&mdsc->mutex); |
2f2dc053 SW |
5037 | for (i = 0; i < mdsc->max_sessions; i++) { |
5038 | if (mdsc->sessions[i]) { | |
5b3248c6 | 5039 | session = ceph_get_mds_session(mdsc->sessions[i]); |
2600d2dd | 5040 | __unregister_session(mdsc, session); |
2f2dc053 SW |
5041 | mutex_unlock(&mdsc->mutex); |
5042 | mutex_lock(&session->s_mutex); | |
5043 | remove_session_caps(session); | |
5044 | mutex_unlock(&session->s_mutex); | |
5045 | ceph_put_mds_session(session); | |
5046 | mutex_lock(&mdsc->mutex); | |
5047 | } | |
5048 | } | |
2f2dc053 | 5049 | WARN_ON(!list_empty(&mdsc->cap_delay_list)); |
2f2dc053 SW |
5050 | mutex_unlock(&mdsc->mutex); |
5051 | ||
75c9627e | 5052 | ceph_cleanup_snapid_map(mdsc); |
5ed91587 | 5053 | ceph_cleanup_global_and_empty_realms(mdsc); |
2f2dc053 | 5054 | |
37c4efc1 | 5055 | cancel_work_sync(&mdsc->cap_reclaim_work); |
2f2dc053 SW |
5056 | cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */ |
5057 | ||
5058 | dout("stopped\n"); | |
5059 | } | |
5060 | ||
48fec5d0 YZ |
5061 | void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc) |
5062 | { | |
5063 | struct ceph_mds_session *session; | |
5064 | int mds; | |
5065 | ||
5066 | dout("force umount\n"); | |
5067 | ||
5068 | mutex_lock(&mdsc->mutex); | |
5069 | for (mds = 0; mds < mdsc->max_sessions; mds++) { | |
5070 | session = __ceph_lookup_mds_session(mdsc, mds); | |
5071 | if (!session) | |
5072 | continue; | |
d468e729 YZ |
5073 | |
5074 | if (session->s_state == CEPH_MDS_SESSION_REJECTED) | |
5075 | __unregister_session(mdsc, session); | |
5076 | __wake_requests(mdsc, &session->s_waiting); | |
48fec5d0 | 5077 | mutex_unlock(&mdsc->mutex); |
d468e729 | 5078 | |
48fec5d0 YZ |
5079 | mutex_lock(&session->s_mutex); |
5080 | __close_session(mdsc, session); | |
5081 | if (session->s_state == CEPH_MDS_SESSION_CLOSING) { | |
5082 | cleanup_session_requests(mdsc, session); | |
5083 | remove_session_caps(session); | |
5084 | } | |
5085 | mutex_unlock(&session->s_mutex); | |
5086 | ceph_put_mds_session(session); | |
d468e729 | 5087 | |
48fec5d0 YZ |
5088 | mutex_lock(&mdsc->mutex); |
5089 | kick_requests(mdsc, mds); | |
5090 | } | |
5091 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
5092 | mutex_unlock(&mdsc->mutex); | |
5093 | } | |
5094 | ||
3d14c5d2 | 5095 | static void ceph_mdsc_stop(struct ceph_mds_client *mdsc) |
2f2dc053 SW |
5096 | { |
5097 | dout("stop\n"); | |
fa996773 XL |
5098 | /* |
5099 | * Make sure the delayed work stopped before releasing | |
5100 | * the resources. | |
5101 | * | |
5102 | * Because the cancel_delayed_work_sync() will only | |
5103 | * guarantee that the work finishes executing. But the | |
5104 | * delayed work will re-arm itself again after that. | |
5105 | */ | |
5106 | flush_delayed_work(&mdsc->delayed_work); | |
5107 | ||
2f2dc053 SW |
5108 | if (mdsc->mdsmap) |
5109 | ceph_mdsmap_destroy(mdsc->mdsmap); | |
5110 | kfree(mdsc->sessions); | |
37151668 | 5111 | ceph_caps_finalize(mdsc); |
10183a69 | 5112 | ceph_pool_perm_destroy(mdsc); |
2f2dc053 SW |
5113 | } |
5114 | ||
3d14c5d2 YS |
5115 | void ceph_mdsc_destroy(struct ceph_fs_client *fsc) |
5116 | { | |
5117 | struct ceph_mds_client *mdsc = fsc->mdsc; | |
ef550f6f | 5118 | dout("mdsc_destroy %p\n", mdsc); |
ef550f6f | 5119 | |
50c55aec CX |
5120 | if (!mdsc) |
5121 | return; | |
5122 | ||
ef550f6f SW |
5123 | /* flush out any connection work with references to us */ |
5124 | ceph_msgr_flush(); | |
5125 | ||
62a65f36 YZ |
5126 | ceph_mdsc_stop(mdsc); |
5127 | ||
f9009efa XL |
5128 | ceph_metric_destroy(&mdsc->metric); |
5129 | ||
3d14c5d2 YS |
5130 | fsc->mdsc = NULL; |
5131 | kfree(mdsc); | |
ef550f6f | 5132 | dout("mdsc_destroy %p done\n", mdsc); |
3d14c5d2 YS |
5133 | } |
5134 | ||
430afbad YZ |
5135 | void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
5136 | { | |
5137 | struct ceph_fs_client *fsc = mdsc->fsc; | |
5138 | const char *mds_namespace = fsc->mount_options->mds_namespace; | |
5139 | void *p = msg->front.iov_base; | |
5140 | void *end = p + msg->front.iov_len; | |
5141 | u32 epoch; | |
430afbad YZ |
5142 | u32 num_fs; |
5143 | u32 mount_fscid = (u32)-1; | |
430afbad YZ |
5144 | int err = -EINVAL; |
5145 | ||
5146 | ceph_decode_need(&p, end, sizeof(u32), bad); | |
5147 | epoch = ceph_decode_32(&p); | |
5148 | ||
5149 | dout("handle_fsmap epoch %u\n", epoch); | |
5150 | ||
06a1ad43 JL |
5151 | /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */ |
5152 | ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad); | |
430afbad | 5153 | |
06a1ad43 | 5154 | ceph_decode_32_safe(&p, end, num_fs, bad); |
430afbad YZ |
5155 | while (num_fs-- > 0) { |
5156 | void *info_p, *info_end; | |
5157 | u32 info_len; | |
430afbad YZ |
5158 | u32 fscid, namelen; |
5159 | ||
5160 | ceph_decode_need(&p, end, 2 + sizeof(u32), bad); | |
06a1ad43 | 5161 | p += 2; // info_v, info_cv |
430afbad YZ |
5162 | info_len = ceph_decode_32(&p); |
5163 | ceph_decode_need(&p, end, info_len, bad); | |
5164 | info_p = p; | |
5165 | info_end = p + info_len; | |
5166 | p = info_end; | |
5167 | ||
5168 | ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad); | |
5169 | fscid = ceph_decode_32(&info_p); | |
5170 | namelen = ceph_decode_32(&info_p); | |
5171 | ceph_decode_need(&info_p, info_end, namelen, bad); | |
5172 | ||
5173 | if (mds_namespace && | |
5174 | strlen(mds_namespace) == namelen && | |
5175 | !strncmp(mds_namespace, (char *)info_p, namelen)) { | |
5176 | mount_fscid = fscid; | |
5177 | break; | |
5178 | } | |
5179 | } | |
5180 | ||
5181 | ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch); | |
5182 | if (mount_fscid != (u32)-1) { | |
5183 | fsc->client->monc.fs_cluster_id = mount_fscid; | |
5184 | ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, | |
5185 | 0, true); | |
5186 | ceph_monc_renew_subs(&fsc->client->monc); | |
5187 | } else { | |
5188 | err = -ENOENT; | |
5189 | goto err_out; | |
5190 | } | |
5191 | return; | |
76bd6ec4 | 5192 | |
430afbad | 5193 | bad: |
631ed4b0 JL |
5194 | pr_err("error decoding fsmap %d. Shutting down mount.\n", err); |
5195 | ceph_umount_begin(mdsc->fsc->sb); | |
430afbad YZ |
5196 | err_out: |
5197 | mutex_lock(&mdsc->mutex); | |
76bd6ec4 | 5198 | mdsc->mdsmap_err = err; |
430afbad YZ |
5199 | __wake_requests(mdsc, &mdsc->waiting_for_map); |
5200 | mutex_unlock(&mdsc->mutex); | |
430afbad | 5201 | } |
2f2dc053 SW |
5202 | |
5203 | /* | |
5204 | * handle mds map update. | |
5205 | */ | |
430afbad | 5206 | void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg) |
2f2dc053 SW |
5207 | { |
5208 | u32 epoch; | |
5209 | u32 maplen; | |
5210 | void *p = msg->front.iov_base; | |
5211 | void *end = p + msg->front.iov_len; | |
5212 | struct ceph_mdsmap *newmap, *oldmap; | |
5213 | struct ceph_fsid fsid; | |
5214 | int err = -EINVAL; | |
5215 | ||
5216 | ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad); | |
5217 | ceph_decode_copy(&p, &fsid, sizeof(fsid)); | |
3d14c5d2 | 5218 | if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0) |
0743304d | 5219 | return; |
c89136ea SW |
5220 | epoch = ceph_decode_32(&p); |
5221 | maplen = ceph_decode_32(&p); | |
2f2dc053 SW |
5222 | dout("handle_map epoch %u len %d\n", epoch, (int)maplen); |
5223 | ||
5224 | /* do we need it? */ | |
2f2dc053 SW |
5225 | mutex_lock(&mdsc->mutex); |
5226 | if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) { | |
5227 | dout("handle_map epoch %u <= our %u\n", | |
5228 | epoch, mdsc->mdsmap->m_epoch); | |
5229 | mutex_unlock(&mdsc->mutex); | |
5230 | return; | |
5231 | } | |
5232 | ||
cd1a677c | 5233 | newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client)); |
2f2dc053 SW |
5234 | if (IS_ERR(newmap)) { |
5235 | err = PTR_ERR(newmap); | |
5236 | goto bad_unlock; | |
5237 | } | |
5238 | ||
5239 | /* swap into place */ | |
5240 | if (mdsc->mdsmap) { | |
5241 | oldmap = mdsc->mdsmap; | |
5242 | mdsc->mdsmap = newmap; | |
5243 | check_new_map(mdsc, newmap, oldmap); | |
5244 | ceph_mdsmap_destroy(oldmap); | |
5245 | } else { | |
5246 | mdsc->mdsmap = newmap; /* first mds map */ | |
5247 | } | |
719784ba CX |
5248 | mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size, |
5249 | MAX_LFS_FILESIZE); | |
2f2dc053 SW |
5250 | |
5251 | __wake_requests(mdsc, &mdsc->waiting_for_map); | |
82dcabad ID |
5252 | ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP, |
5253 | mdsc->mdsmap->m_epoch); | |
2f2dc053 SW |
5254 | |
5255 | mutex_unlock(&mdsc->mutex); | |
bf2ba432 | 5256 | schedule_delayed(mdsc, 0); |
2f2dc053 SW |
5257 | return; |
5258 | ||
5259 | bad_unlock: | |
5260 | mutex_unlock(&mdsc->mutex); | |
5261 | bad: | |
631ed4b0 JL |
5262 | pr_err("error decoding mdsmap %d. Shutting down mount.\n", err); |
5263 | ceph_umount_begin(mdsc->fsc->sb); | |
2f2dc053 SW |
5264 | return; |
5265 | } | |
5266 | ||
4972cf60 | 5267 | static struct ceph_connection *mds_get_con(struct ceph_connection *con) |
2f2dc053 SW |
5268 | { |
5269 | struct ceph_mds_session *s = con->private; | |
5270 | ||
5b3248c6 | 5271 | if (ceph_get_mds_session(s)) |
2f2dc053 | 5272 | return con; |
2f2dc053 SW |
5273 | return NULL; |
5274 | } | |
5275 | ||
4972cf60 | 5276 | static void mds_put_con(struct ceph_connection *con) |
2f2dc053 SW |
5277 | { |
5278 | struct ceph_mds_session *s = con->private; | |
5279 | ||
2f2dc053 SW |
5280 | ceph_put_mds_session(s); |
5281 | } | |
5282 | ||
5283 | /* | |
5284 | * if the client is unresponsive for long enough, the mds will kill | |
5285 | * the session entirely. | |
5286 | */ | |
4972cf60 | 5287 | static void mds_peer_reset(struct ceph_connection *con) |
2f2dc053 SW |
5288 | { |
5289 | struct ceph_mds_session *s = con->private; | |
7e70f0ed | 5290 | struct ceph_mds_client *mdsc = s->s_mdsc; |
2f2dc053 | 5291 | |
f3ae1b97 | 5292 | pr_warn("mds%d closed our session\n", s->s_mds); |
7e70f0ed | 5293 | send_mds_reconnect(mdsc, s); |
2f2dc053 SW |
5294 | } |
5295 | ||
4972cf60 | 5296 | static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg) |
2f2dc053 SW |
5297 | { |
5298 | struct ceph_mds_session *s = con->private; | |
5299 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
5300 | int type = le16_to_cpu(msg->hdr.type); | |
5301 | ||
2600d2dd SW |
5302 | mutex_lock(&mdsc->mutex); |
5303 | if (__verify_registered_session(mdsc, s) < 0) { | |
5304 | mutex_unlock(&mdsc->mutex); | |
5305 | goto out; | |
5306 | } | |
5307 | mutex_unlock(&mdsc->mutex); | |
5308 | ||
2f2dc053 SW |
5309 | switch (type) { |
5310 | case CEPH_MSG_MDS_MAP: | |
430afbad YZ |
5311 | ceph_mdsc_handle_mdsmap(mdsc, msg); |
5312 | break; | |
5313 | case CEPH_MSG_FS_MAP_USER: | |
5314 | ceph_mdsc_handle_fsmap(mdsc, msg); | |
2f2dc053 SW |
5315 | break; |
5316 | case CEPH_MSG_CLIENT_SESSION: | |
5317 | handle_session(s, msg); | |
5318 | break; | |
5319 | case CEPH_MSG_CLIENT_REPLY: | |
5320 | handle_reply(s, msg); | |
5321 | break; | |
5322 | case CEPH_MSG_CLIENT_REQUEST_FORWARD: | |
2600d2dd | 5323 | handle_forward(mdsc, s, msg); |
2f2dc053 SW |
5324 | break; |
5325 | case CEPH_MSG_CLIENT_CAPS: | |
5326 | ceph_handle_caps(s, msg); | |
5327 | break; | |
5328 | case CEPH_MSG_CLIENT_SNAP: | |
2600d2dd | 5329 | ceph_handle_snap(mdsc, s, msg); |
2f2dc053 SW |
5330 | break; |
5331 | case CEPH_MSG_CLIENT_LEASE: | |
2600d2dd | 5332 | handle_lease(mdsc, s, msg); |
2f2dc053 | 5333 | break; |
fb18a575 LH |
5334 | case CEPH_MSG_CLIENT_QUOTA: |
5335 | ceph_handle_quota(mdsc, s, msg); | |
5336 | break; | |
2f2dc053 SW |
5337 | |
5338 | default: | |
5339 | pr_err("received unknown message type %d %s\n", type, | |
5340 | ceph_msg_type_name(type)); | |
5341 | } | |
2600d2dd | 5342 | out: |
2f2dc053 SW |
5343 | ceph_msg_put(msg); |
5344 | } | |
5345 | ||
4e7a5dcd SW |
5346 | /* |
5347 | * authentication | |
5348 | */ | |
a3530df3 AE |
5349 | |
5350 | /* | |
5351 | * Note: returned pointer is the address of a structure that's | |
5352 | * managed separately. Caller must *not* attempt to free it. | |
5353 | */ | |
4972cf60 ID |
5354 | static struct ceph_auth_handshake * |
5355 | mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new) | |
4e7a5dcd SW |
5356 | { |
5357 | struct ceph_mds_session *s = con->private; | |
5358 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 5359 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
74f1869f | 5360 | struct ceph_auth_handshake *auth = &s->s_auth; |
ce287162 | 5361 | int ret; |
4e7a5dcd | 5362 | |
ce287162 ID |
5363 | ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, |
5364 | force_new, proto, NULL, NULL); | |
5365 | if (ret) | |
5366 | return ERR_PTR(ret); | |
74f1869f | 5367 | |
a3530df3 | 5368 | return auth; |
4e7a5dcd SW |
5369 | } |
5370 | ||
4972cf60 | 5371 | static int mds_add_authorizer_challenge(struct ceph_connection *con, |
6daca13d ID |
5372 | void *challenge_buf, int challenge_buf_len) |
5373 | { | |
5374 | struct ceph_mds_session *s = con->private; | |
5375 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
5376 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; | |
5377 | ||
5378 | return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer, | |
5379 | challenge_buf, challenge_buf_len); | |
5380 | } | |
4e7a5dcd | 5381 | |
4972cf60 | 5382 | static int mds_verify_authorizer_reply(struct ceph_connection *con) |
4e7a5dcd SW |
5383 | { |
5384 | struct ceph_mds_session *s = con->private; | |
5385 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 5386 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
285ea34f | 5387 | struct ceph_auth_handshake *auth = &s->s_auth; |
4e7a5dcd | 5388 | |
285ea34f ID |
5389 | return ceph_auth_verify_authorizer_reply(ac, auth->authorizer, |
5390 | auth->authorizer_reply_buf, auth->authorizer_reply_buf_len, | |
5391 | NULL, NULL, NULL, NULL); | |
4e7a5dcd SW |
5392 | } |
5393 | ||
4972cf60 | 5394 | static int mds_invalidate_authorizer(struct ceph_connection *con) |
9bd2e6f8 SW |
5395 | { |
5396 | struct ceph_mds_session *s = con->private; | |
5397 | struct ceph_mds_client *mdsc = s->s_mdsc; | |
3d14c5d2 | 5398 | struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth; |
9bd2e6f8 | 5399 | |
27859f97 | 5400 | ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS); |
9bd2e6f8 | 5401 | |
3d14c5d2 | 5402 | return ceph_monc_validate_auth(&mdsc->fsc->client->monc); |
9bd2e6f8 SW |
5403 | } |
5404 | ||
cd1a677c ID |
5405 | static int mds_get_auth_request(struct ceph_connection *con, |
5406 | void *buf, int *buf_len, | |
5407 | void **authorizer, int *authorizer_len) | |
5408 | { | |
5409 | struct ceph_mds_session *s = con->private; | |
5410 | struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; | |
5411 | struct ceph_auth_handshake *auth = &s->s_auth; | |
5412 | int ret; | |
5413 | ||
5414 | ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS, | |
5415 | buf, buf_len); | |
5416 | if (ret) | |
5417 | return ret; | |
5418 | ||
5419 | *authorizer = auth->authorizer_buf; | |
5420 | *authorizer_len = auth->authorizer_buf_len; | |
5421 | return 0; | |
5422 | } | |
5423 | ||
5424 | static int mds_handle_auth_reply_more(struct ceph_connection *con, | |
5425 | void *reply, int reply_len, | |
5426 | void *buf, int *buf_len, | |
5427 | void **authorizer, int *authorizer_len) | |
5428 | { | |
5429 | struct ceph_mds_session *s = con->private; | |
5430 | struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; | |
5431 | struct ceph_auth_handshake *auth = &s->s_auth; | |
5432 | int ret; | |
5433 | ||
5434 | ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len, | |
5435 | buf, buf_len); | |
5436 | if (ret) | |
5437 | return ret; | |
5438 | ||
5439 | *authorizer = auth->authorizer_buf; | |
5440 | *authorizer_len = auth->authorizer_buf_len; | |
5441 | return 0; | |
5442 | } | |
5443 | ||
5444 | static int mds_handle_auth_done(struct ceph_connection *con, | |
5445 | u64 global_id, void *reply, int reply_len, | |
5446 | u8 *session_key, int *session_key_len, | |
5447 | u8 *con_secret, int *con_secret_len) | |
5448 | { | |
5449 | struct ceph_mds_session *s = con->private; | |
5450 | struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth; | |
5451 | struct ceph_auth_handshake *auth = &s->s_auth; | |
5452 | ||
5453 | return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len, | |
5454 | session_key, session_key_len, | |
5455 | con_secret, con_secret_len); | |
5456 | } | |
5457 | ||
5458 | static int mds_handle_auth_bad_method(struct ceph_connection *con, | |
5459 | int used_proto, int result, | |
5460 | const int *allowed_protos, int proto_cnt, | |
5461 | const int *allowed_modes, int mode_cnt) | |
5462 | { | |
5463 | struct ceph_mds_session *s = con->private; | |
5464 | struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc; | |
5465 | int ret; | |
5466 | ||
5467 | if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS, | |
5468 | used_proto, result, | |
5469 | allowed_protos, proto_cnt, | |
5470 | allowed_modes, mode_cnt)) { | |
5471 | ret = ceph_monc_validate_auth(monc); | |
5472 | if (ret) | |
5473 | return ret; | |
5474 | } | |
5475 | ||
5476 | return -EACCES; | |
5477 | } | |
5478 | ||
53ded495 AE |
5479 | static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con, |
5480 | struct ceph_msg_header *hdr, int *skip) | |
5481 | { | |
5482 | struct ceph_msg *msg; | |
5483 | int type = (int) le16_to_cpu(hdr->type); | |
5484 | int front_len = (int) le32_to_cpu(hdr->front_len); | |
5485 | ||
5486 | if (con->in_msg) | |
5487 | return con->in_msg; | |
5488 | ||
5489 | *skip = 0; | |
5490 | msg = ceph_msg_new(type, front_len, GFP_NOFS, false); | |
5491 | if (!msg) { | |
5492 | pr_err("unable to allocate msg type %d len %d\n", | |
5493 | type, front_len); | |
5494 | return NULL; | |
5495 | } | |
53ded495 AE |
5496 | |
5497 | return msg; | |
5498 | } | |
5499 | ||
79dbd1ba | 5500 | static int mds_sign_message(struct ceph_msg *msg) |
33d07337 | 5501 | { |
79dbd1ba | 5502 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 5503 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 5504 | |
33d07337 YZ |
5505 | return ceph_auth_sign_message(auth, msg); |
5506 | } | |
5507 | ||
79dbd1ba | 5508 | static int mds_check_message_signature(struct ceph_msg *msg) |
33d07337 | 5509 | { |
79dbd1ba | 5510 | struct ceph_mds_session *s = msg->con->private; |
33d07337 | 5511 | struct ceph_auth_handshake *auth = &s->s_auth; |
79dbd1ba | 5512 | |
33d07337 YZ |
5513 | return ceph_auth_check_message_signature(auth, msg); |
5514 | } | |
5515 | ||
9e32789f | 5516 | static const struct ceph_connection_operations mds_con_ops = { |
4972cf60 ID |
5517 | .get = mds_get_con, |
5518 | .put = mds_put_con, | |
53ded495 | 5519 | .alloc_msg = mds_alloc_msg, |
4972cf60 ID |
5520 | .dispatch = mds_dispatch, |
5521 | .peer_reset = mds_peer_reset, | |
5522 | .get_authorizer = mds_get_authorizer, | |
5523 | .add_authorizer_challenge = mds_add_authorizer_challenge, | |
5524 | .verify_authorizer_reply = mds_verify_authorizer_reply, | |
5525 | .invalidate_authorizer = mds_invalidate_authorizer, | |
79dbd1ba ID |
5526 | .sign_message = mds_sign_message, |
5527 | .check_message_signature = mds_check_message_signature, | |
cd1a677c ID |
5528 | .get_auth_request = mds_get_auth_request, |
5529 | .handle_auth_reply_more = mds_handle_auth_reply_more, | |
5530 | .handle_auth_done = mds_handle_auth_done, | |
5531 | .handle_auth_bad_method = mds_handle_auth_bad_method, | |
2f2dc053 SW |
5532 | }; |
5533 | ||
2f2dc053 | 5534 | /* eof */ |