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Merge tag 'regmap-fix-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-block.git] / fs / ceph / mds_client.c
CommitLineData
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>
2f2dc053 14
2f2dc053 15#include "super.h"
3d14c5d2
YS		 16#include "mds_client.h"
17
1fe60e51 18#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 19#include <linux/ceph/messenger.h>
20#include <linux/ceph/decode.h>
21#include <linux/ceph/pagelist.h>
22#include <linux/ceph/auth.h>
23#include <linux/ceph/debugfs.h>
2f2dc053 24
81c5a148
YZ		 25#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
26
2f2dc053
SW		 27/*
28 * A cluster of MDS (metadata server) daemons is responsible for
29 * managing the file system namespace (the directory hierarchy and
30 * inodes) and for coordinating shared access to storage. Metadata is
31 * partitioning hierarchically across a number of servers, and that
32 * partition varies over time as the cluster adjusts the distribution
33 * in order to balance load.
34 *
35 * The MDS client is primarily responsible to managing synchronous
36 * metadata requests for operations like open, unlink, and so forth.
37 * If there is a MDS failure, we find out about it when we (possibly
38 * request and) receive a new MDS map, and can resubmit affected
39 * requests.
40 *
41 * For the most part, though, we take advantage of a lossless
42 * communications channel to the MDS, and do not need to worry about
43 * timing out or resubmitting requests.
44 *
45 * We maintain a stateful "session" with each MDS we interact with.
46 * Within each session, we sent periodic heartbeat messages to ensure
47 * any capabilities or leases we have been issues remain valid. If
48 * the session times out and goes stale, our leases and capabilities
49 * are no longer valid.
50 */
51
20cb34ae 52struct ceph_reconnect_state {
81c5a148
YZ		 53 struct ceph_mds_session *session;
54 int nr_caps, nr_realms;
20cb34ae 55 struct ceph_pagelist *pagelist;
121f22a1 56 unsigned msg_version;
81c5a148 57 bool allow_multi;
20cb34ae
SW		 58};
59
2f2dc053
SW		 60static void __wake_requests(struct ceph_mds_client *mdsc,
61 struct list_head *head);
e3ec8d68 62static void ceph_cap_release_work(struct work_struct *work);
37c4efc1 63static void ceph_cap_reclaim_work(struct work_struct *work);
2f2dc053 64
9e32789f 65static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 66
67
68/*
69 * mds reply parsing
70 */
71
b37fe1f9
YZ		 72static int parse_reply_info_quota(void **p, void *end,
73 struct ceph_mds_reply_info_in *info)
74{
75 u8 struct_v, struct_compat;
76 u32 struct_len;
77
78 ceph_decode_8_safe(p, end, struct_v, bad);
79 ceph_decode_8_safe(p, end, struct_compat, bad);
80 /* struct_v is expected to be >= 1. we only
81 * understand encoding with struct_compat == 1. */
82 if (!struct_v || struct_compat != 1)
83 goto bad;
84 ceph_decode_32_safe(p, end, struct_len, bad);
85 ceph_decode_need(p, end, struct_len, bad);
86 end = *p + struct_len;
87 ceph_decode_64_safe(p, end, info->max_bytes, bad);
88 ceph_decode_64_safe(p, end, info->max_files, bad);
89 *p = end;
90 return 0;
91bad:
92 return -EIO;
93}
94
2f2dc053
SW		 95/*
96 * parse individual inode info
97 */
98static int parse_reply_info_in(void **p, void *end,
14303d20 99 struct ceph_mds_reply_info_in *info,
12b4629a 100 u64 features)
2f2dc053 101{
b37fe1f9
YZ		 102 int err = 0;
103 u8 struct_v = 0;
2f2dc053 104
b37fe1f9
YZ		 105 if (features == (u64)-1) {
106 u32 struct_len;
107 u8 struct_compat;
108 ceph_decode_8_safe(p, end, struct_v, bad);
109 ceph_decode_8_safe(p, end, struct_compat, bad);
110 /* struct_v is expected to be >= 1. we only understand
111 * encoding with struct_compat == 1. */
112 if (!struct_v || struct_compat != 1)
113 goto bad;
114 ceph_decode_32_safe(p, end, struct_len, bad);
115 ceph_decode_need(p, end, struct_len, bad);
116 end = *p + struct_len;
117 }
118
119 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
2f2dc053
SW		 120 info->in = *p;
121 *p += sizeof(struct ceph_mds_reply_inode) +
122 sizeof(*info->in->fragtree.splits) *
123 le32_to_cpu(info->in->fragtree.nsplits);
124
125 ceph_decode_32_safe(p, end, info->symlink_len, bad);
126 ceph_decode_need(p, end, info->symlink_len, bad);
127 info->symlink = *p;
128 *p += info->symlink_len;
129
23c625ce
ID		 130 ceph_decode_copy_safe(p, end, &info->dir_layout,
131 sizeof(info->dir_layout), bad);
2f2dc053
SW		 132 ceph_decode_32_safe(p, end, info->xattr_len, bad);
133 ceph_decode_need(p, end, info->xattr_len, bad);
134 info->xattr_data = *p;
135 *p += info->xattr_len;
fb01d1f8 136
b37fe1f9
YZ		 137 if (features == (u64)-1) {
138 /* inline data */
fb01d1f8
YZ		 139 ceph_decode_64_safe(p, end, info->inline_version, bad);
140 ceph_decode_32_safe(p, end, info->inline_len, bad);
141 ceph_decode_need(p, end, info->inline_len, bad);
142 info->inline_data = *p;
143 *p += info->inline_len;
b37fe1f9
YZ		 144 /* quota */
145 err = parse_reply_info_quota(p, end, info);
146 if (err < 0)
147 goto out_bad;
148 /* pool namespace */
149 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
150 if (info->pool_ns_len > 0) {
151 ceph_decode_need(p, end, info->pool_ns_len, bad);
152 info->pool_ns_data = *p;
153 *p += info->pool_ns_len;
154 }
245ce991
JL		 155
156 /* btime */
157 ceph_decode_need(p, end, sizeof(info->btime), bad);
158 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
159
160 /* change attribute */
a35ead31 161 ceph_decode_64_safe(p, end, info->change_attr, bad);
fb01d1f8 162
08796873
YZ		 163 /* dir pin */
164 if (struct_v >= 2) {
165 ceph_decode_32_safe(p, end, info->dir_pin, bad);
166 } else {
167 info->dir_pin = -ENODATA;
168 }
169
193e7b37
DD		 170 /* snapshot birth time, remains zero for v<=2 */
171 if (struct_v >= 3) {
172 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
173 ceph_decode_copy(p, &info->snap_btime,
174 sizeof(info->snap_btime));
175 } else {
176 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
177 }
178
b37fe1f9
YZ		 179 *p = end;
180 } else {
181 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
182 ceph_decode_64_safe(p, end, info->inline_version, bad);
183 ceph_decode_32_safe(p, end, info->inline_len, bad);
184 ceph_decode_need(p, end, info->inline_len, bad);
185 info->inline_data = *p;
186 *p += info->inline_len;
187 } else
188 info->inline_version = CEPH_INLINE_NONE;
189
190 if (features & CEPH_FEATURE_MDS_QUOTA) {
191 err = parse_reply_info_quota(p, end, info);
192 if (err < 0)
193 goto out_bad;
194 } else {
195 info->max_bytes = 0;
196 info->max_files = 0;
197 }
198
199 info->pool_ns_len = 0;
200 info->pool_ns_data = NULL;
201 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
202 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
203 if (info->pool_ns_len > 0) {
204 ceph_decode_need(p, end, info->pool_ns_len, bad);
205 info->pool_ns_data = *p;
206 *p += info->pool_ns_len;
207 }
208 }
08796873 209
245ce991
JL		 210 if (features & CEPH_FEATURE_FS_BTIME) {
211 ceph_decode_need(p, end, sizeof(info->btime), bad);
212 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
a35ead31 213 ceph_decode_64_safe(p, end, info->change_attr, bad);
245ce991
JL		 214 }
215
08796873 216 info->dir_pin = -ENODATA;
193e7b37 217 /* info->snap_btime remains zero */
b37fe1f9
YZ		 218 }
219 return 0;
220bad:
221 err = -EIO;
222out_bad:
223 return err;
224}
225
226static int parse_reply_info_dir(void **p, void *end,
227 struct ceph_mds_reply_dirfrag **dirfrag,
228 u64 features)
229{
230 if (features == (u64)-1) {
fb18a575
LH		 231 u8 struct_v, struct_compat;
232 u32 struct_len;
fb18a575
LH		 233 ceph_decode_8_safe(p, end, struct_v, bad);
234 ceph_decode_8_safe(p, end, struct_compat, bad);
b37fe1f9
YZ		 235 /* struct_v is expected to be >= 1. we only understand
236 * encoding whose struct_compat == 1. */
237 if (!struct_v || struct_compat != 1)
fb18a575
LH		 238 goto bad;
239 ceph_decode_32_safe(p, end, struct_len, bad);
240 ceph_decode_need(p, end, struct_len, bad);
b37fe1f9 241 end = *p + struct_len;
fb18a575
LH		 242 }
243
b37fe1f9
YZ		 244 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
245 *dirfrag = *p;
246 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
247 if (unlikely(*p > end))
248 goto bad;
249 if (features == (u64)-1)
250 *p = end;
251 return 0;
252bad:
253 return -EIO;
254}
255
256static int parse_reply_info_lease(void **p, void *end,
257 struct ceph_mds_reply_lease **lease,
258 u64 features)
259{
260 if (features == (u64)-1) {
261 u8 struct_v, struct_compat;
262 u32 struct_len;
263 ceph_decode_8_safe(p, end, struct_v, bad);
264 ceph_decode_8_safe(p, end, struct_compat, bad);
265 /* struct_v is expected to be >= 1. we only understand
266 * encoding whose struct_compat == 1. */
267 if (!struct_v || struct_compat != 1)
268 goto bad;
269 ceph_decode_32_safe(p, end, struct_len, bad);
270 ceph_decode_need(p, end, struct_len, bad);
271 end = *p + struct_len;
5ea5c5e0
YZ		 272 }
273
b37fe1f9
YZ		 274 ceph_decode_need(p, end, sizeof(**lease), bad);
275 *lease = *p;
276 *p += sizeof(**lease);
277 if (features == (u64)-1)
278 *p = end;
2f2dc053
SW		 279 return 0;
280bad:
b37fe1f9 281 return -EIO;
2f2dc053
SW		 282}
283
284/*
285 * parse a normal reply, which may contain a (dir+)dentry and/or a
286 * target inode.
287 */
288static int parse_reply_info_trace(void **p, void *end,
14303d20 289 struct ceph_mds_reply_info_parsed *info,
12b4629a 290 u64 features)
2f2dc053
SW		 291{
292 int err;
293
294 if (info->head->is_dentry) {
14303d20 295 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 296 if (err < 0)
297 goto out_bad;
298
b37fe1f9
YZ		 299 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
300 if (err < 0)
301 goto out_bad;
2f2dc053
SW		 302
303 ceph_decode_32_safe(p, end, info->dname_len, bad);
304 ceph_decode_need(p, end, info->dname_len, bad);
305 info->dname = *p;
306 *p += info->dname_len;
b37fe1f9
YZ		 307
308 err = parse_reply_info_lease(p, end, &info->dlease, features);
309 if (err < 0)
310 goto out_bad;
2f2dc053
SW		 311 }
312
313 if (info->head->is_target) {
14303d20 314 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 315 if (err < 0)
316 goto out_bad;
317 }
318
319 if (unlikely(*p != end))
320 goto bad;
321 return 0;
322
323bad:
324 err = -EIO;
325out_bad:
326 pr_err("problem parsing mds trace %d\n", err);
327 return err;
328}
329
330/*
331 * parse readdir results
332 */
b37fe1f9 333static int parse_reply_info_readdir(void **p, void *end,
14303d20 334 struct ceph_mds_reply_info_parsed *info,
12b4629a 335 u64 features)
2f2dc053
SW		 336{
337 u32 num, i = 0;
338 int err;
339
b37fe1f9
YZ		 340 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
341 if (err < 0)
342 goto out_bad;
2f2dc053
SW		 343
344 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 345 num = ceph_decode_32(p);
956d39d6
YZ		 346 {
347 u16 flags = ceph_decode_16(p);
348 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
349 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 350 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 351 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 352 }
2f2dc053
SW		 353 if (num == 0)
354 goto done;
355
2a5beea3
YZ		 356 BUG_ON(!info->dir_entries);
357 if ((unsigned long)(info->dir_entries + num) >
358 (unsigned long)info->dir_entries + info->dir_buf_size) {
54008399
YZ		 359 pr_err("dir contents are larger than expected\n");
360 WARN_ON(1);
361 goto bad;
362 }
2f2dc053 363
54008399 364 info->dir_nr = num;
2f2dc053 365 while (num) {
2a5beea3 366 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
2f2dc053 367 /* dentry */
b37fe1f9 368 ceph_decode_32_safe(p, end, rde->name_len, bad);
2a5beea3
YZ		 369 ceph_decode_need(p, end, rde->name_len, bad);
370 rde->name = *p;
371 *p += rde->name_len;
372 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
2f2dc053 373
b37fe1f9
YZ		 374 /* dentry lease */
375 err = parse_reply_info_lease(p, end, &rde->lease, features);
376 if (err)
377 goto out_bad;
2f2dc053 378 /* inode */
2a5beea3 379 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 380 if (err < 0)
381 goto out_bad;
8974eebd
YZ		 382 /* ceph_readdir_prepopulate() will update it */
383 rde->offset = 0;
2f2dc053
SW		 384 i++;
385 num--;
386 }
387
388done:
1d3f8723
JL		 389 /* Skip over any unrecognized fields */
390 *p = end;
2f2dc053
SW		 391 return 0;
392
393bad:
394 err = -EIO;
395out_bad:
396 pr_err("problem parsing dir contents %d\n", err);
397 return err;
398}
399
25933abd
HS		 400/*
401 * parse fcntl F_GETLK results
402 */
403static int parse_reply_info_filelock(void **p, void *end,
14303d20 404 struct ceph_mds_reply_info_parsed *info,
12b4629a 405 u64 features)
25933abd
HS		 406{
407 if (*p + sizeof(*info->filelock_reply) > end)
408 goto bad;
409
410 info->filelock_reply = *p;
25933abd 411
1d3f8723
JL		 412 /* Skip over any unrecognized fields */
413 *p = end;
25933abd 414 return 0;
25933abd
HS		 415bad:
416 return -EIO;
417}
418
d4846487
JL		 419
420#if BITS_PER_LONG == 64
421
422#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
423
424static int ceph_parse_deleg_inos(void **p, void *end,
425 struct ceph_mds_session *s)
426{
427 u32 sets;
428
429 ceph_decode_32_safe(p, end, sets, bad);
430 dout("got %u sets of delegated inodes\n", sets);
431 while (sets--) {
432 u64 start, len, ino;
433
434 ceph_decode_64_safe(p, end, start, bad);
435 ceph_decode_64_safe(p, end, len, bad);
436 while (len--) {
437 int err = xa_insert(&s->s_delegated_inos, ino = start++,
438 DELEGATED_INO_AVAILABLE,
439 GFP_KERNEL);
440 if (!err) {
441 dout("added delegated inode 0x%llx\n",
442 start - 1);
443 } else if (err == -EBUSY) {
444 pr_warn("ceph: MDS delegated inode 0x%llx more than once.\n",
445 start - 1);
446 } else {
447 return err;
448 }
449 }
450 }
451 return 0;
452bad:
453 return -EIO;
454}
455
456u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
457{
458 unsigned long ino;
459 void *val;
460
461 xa_for_each(&s->s_delegated_inos, ino, val) {
462 val = xa_erase(&s->s_delegated_inos, ino);
463 if (val == DELEGATED_INO_AVAILABLE)
464 return ino;
465 }
466 return 0;
467}
468
469int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
470{
471 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
472 GFP_KERNEL);
473}
474#else /* BITS_PER_LONG == 64 */
475/*
476 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
477 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
478 * and bottom words?
479 */
480static int ceph_parse_deleg_inos(void **p, void *end,
481 struct ceph_mds_session *s)
482{
483 u32 sets;
484
485 ceph_decode_32_safe(p, end, sets, bad);
486 if (sets)
487 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
488 return 0;
489bad:
490 return -EIO;
491}
492
493u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
494{
495 return 0;
496}
497
498int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
499{
500 return 0;
501}
502#endif /* BITS_PER_LONG == 64 */
503
6e8575fa
SL		 504/*
505 * parse create results
506 */
507static int parse_reply_info_create(void **p, void *end,
508 struct ceph_mds_reply_info_parsed *info,
d4846487 509 u64 features, struct ceph_mds_session *s)
6e8575fa 510{
d4846487
JL		 511 int ret;
512
b37fe1f9
YZ		 513 if (features == (u64)-1 ||
514 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
6e8575fa 515 if (*p == end) {
d4846487 516 /* Malformed reply? */
6e8575fa 517 info->has_create_ino = false;
d4846487
JL		 518 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
519 u8 struct_v, struct_compat;
520 u32 len;
521
6e8575fa 522 info->has_create_ino = true;
d4846487
JL		 523 ceph_decode_8_safe(p, end, struct_v, bad);
524 ceph_decode_8_safe(p, end, struct_compat, bad);
525 ceph_decode_32_safe(p, end, len, bad);
526 ceph_decode_64_safe(p, end, info->ino, bad);
527 ret = ceph_parse_deleg_inos(p, end, s);
528 if (ret)
529 return ret;
530 } else {
531 /* legacy */
1d3f8723 532 ceph_decode_64_safe(p, end, info->ino, bad);
d4846487 533 info->has_create_ino = true;
6e8575fa 534 }
1d3f8723
JL		 535 } else {
536 if (*p != end)
537 goto bad;
6e8575fa
SL		 538 }
539
1d3f8723
JL		 540 /* Skip over any unrecognized fields */
541 *p = end;
6e8575fa 542 return 0;
6e8575fa
SL		 543bad:
544 return -EIO;
545}
546
25933abd
HS		 547/*
548 * parse extra results
549 */
550static int parse_reply_info_extra(void **p, void *end,
14303d20 551 struct ceph_mds_reply_info_parsed *info,
d4846487 552 u64 features, struct ceph_mds_session *s)
25933abd 553{
6df8c9d8
JL		 554 u32 op = le32_to_cpu(info->head->op);
555
556 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 557 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 558 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
b37fe1f9 559 return parse_reply_info_readdir(p, end, info, features);
6df8c9d8 560 else if (op == CEPH_MDS_OP_CREATE)
d4846487 561 return parse_reply_info_create(p, end, info, features, s);
6e8575fa
SL		 562 else
563 return -EIO;
25933abd
HS		 564}
565
2f2dc053
SW		 566/*
567 * parse entire mds reply
568 */
d4846487 569static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
14303d20 570 struct ceph_mds_reply_info_parsed *info,
12b4629a 571 u64 features)
2f2dc053
SW		 572{
573 void *p, *end;
574 u32 len;
575 int err;
576
577 info->head = msg->front.iov_base;
578 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
579 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
580
581 /* trace */
582 ceph_decode_32_safe(&p, end, len, bad);
583 if (len > 0) {
32852a81 584 ceph_decode_need(&p, end, len, bad);
14303d20 585 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 586 if (err < 0)
587 goto out_bad;
588 }
589
25933abd 590 /* extra */
2f2dc053
SW		 591 ceph_decode_32_safe(&p, end, len, bad);
592 if (len > 0) {
32852a81 593 ceph_decode_need(&p, end, len, bad);
d4846487 594 err = parse_reply_info_extra(&p, p+len, info, features, s);
2f2dc053
SW		 595 if (err < 0)
596 goto out_bad;
597 }
598
599 /* snap blob */
600 ceph_decode_32_safe(&p, end, len, bad);
601 info->snapblob_len = len;
602 info->snapblob = p;
603 p += len;
604
605 if (p != end)
606 goto bad;
607 return 0;
608
609bad:
610 err = -EIO;
611out_bad:
612 pr_err("mds parse_reply err %d\n", err);
613 return err;
614}
615
616static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
617{
2a5beea3 618 if (!info->dir_entries)
54008399 619 return;
2a5beea3 620 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 621}
622
623
624/*
625 * sessions
626 */
a687ecaf 627const char *ceph_session_state_name(int s)
2f2dc053
SW		 628{
629 switch (s) {
630 case CEPH_MDS_SESSION_NEW: return "new";
631 case CEPH_MDS_SESSION_OPENING: return "opening";
632 case CEPH_MDS_SESSION_OPEN: return "open";
633 case CEPH_MDS_SESSION_HUNG: return "hung";
634 case CEPH_MDS_SESSION_CLOSING: return "closing";
4d681c2f 635 case CEPH_MDS_SESSION_CLOSED: return "closed";
44ca18f2 636 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 637 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 638 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 639 default: return "???";
640 }
641}
642
5b3248c6 643struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
2f2dc053 644{
3997c01d 645 if (refcount_inc_not_zero(&s->s_ref)) {
2f2dc053 646 dout("mdsc get_session %p %d -> %d\n", s,
3997c01d 647 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
2f2dc053
SW		 648 return s;
649 } else {
4c069a58 650 dout("mdsc get_session %p 0 -- FAIL\n", s);
2f2dc053
SW		 651 return NULL;
652 }
653}
654
655void ceph_put_mds_session(struct ceph_mds_session *s)
656{
657 dout("mdsc put_session %p %d -> %d\n", s,
3997c01d
ER		 658 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
659 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 660 if (s->s_auth.authorizer)
6c1ea260 661 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
88828190 662 WARN_ON(mutex_is_locked(&s->s_mutex));
d4846487 663 xa_destroy(&s->s_delegated_inos);
2f2dc053 664 kfree(s);
4e7a5dcd 665 }
2f2dc053
SW		 666}
667
668/*
669 * called under mdsc->mutex
670 */
671struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
672 int mds)
673{
d37b1d99 674 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 675 return NULL;
5b3248c6 676 return ceph_get_mds_session(mdsc->sessions[mds]);
2f2dc053
SW		 677}
678
679static bool __have_session(struct ceph_mds_client *mdsc, int mds)
680{
98cfda81 681 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 682 return false;
98cfda81
CX		 683 else
684 return true;
2f2dc053
SW		 685}
686
2600d2dd
SW		 687static int __verify_registered_session(struct ceph_mds_client *mdsc,
688 struct ceph_mds_session *s)
689{
690 if (s->s_mds >= mdsc->max_sessions ||
691 mdsc->sessions[s->s_mds] != s)
692 return -ENOENT;
693 return 0;
694}
695
2f2dc053
SW		 696/*
697 * create+register a new session for given mds.
698 * called under mdsc->mutex.
699 */
700static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
701 int mds)
702{
703 struct ceph_mds_session *s;
704
b38c9eb4 705 if (mds >= mdsc->mdsmap->possible_max_rank)
c338c07c
NY		 706 return ERR_PTR(-EINVAL);
707
2f2dc053 708 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 709 if (!s)
710 return ERR_PTR(-ENOMEM);
47474d0b
CX		 711
712 if (mds >= mdsc->max_sessions) {
713 int newmax = 1 << get_count_order(mds + 1);
714 struct ceph_mds_session **sa;
715
716 dout("%s: realloc to %d\n", __func__, newmax);
717 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
718 if (!sa)
719 goto fail_realloc;
720 if (mdsc->sessions) {
721 memcpy(sa, mdsc->sessions,
722 mdsc->max_sessions * sizeof(void *));
723 kfree(mdsc->sessions);
724 }
725 mdsc->sessions = sa;
726 mdsc->max_sessions = newmax;
727 }
728
729 dout("%s: mds%d\n", __func__, mds);
2f2dc053
SW		 730 s->s_mdsc = mdsc;
731 s->s_mds = mds;
732 s->s_state = CEPH_MDS_SESSION_NEW;
733 s->s_ttl = 0;
734 s->s_seq = 0;
735 mutex_init(&s->s_mutex);
736
b7a9e5dd 737 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 738
d8fb02ab 739 spin_lock_init(&s->s_gen_ttl_lock);
1e9c2eb6 740 s->s_cap_gen = 1;
1ce208a6 741 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 742
743 spin_lock_init(&s->s_cap_lock);
2f2dc053
SW		 744 s->s_renew_requested = 0;
745 s->s_renew_seq = 0;
746 INIT_LIST_HEAD(&s->s_caps);
747 s->s_nr_caps = 0;
3997c01d 748 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 749 INIT_LIST_HEAD(&s->s_waiting);
750 INIT_LIST_HEAD(&s->s_unsafe);
d4846487 751 xa_init(&s->s_delegated_inos);
2f2dc053 752 s->s_num_cap_releases = 0;
99a9c273 753 s->s_cap_reconnect = 0;
7c1332b8 754 s->s_cap_iterator = NULL;
2f2dc053 755 INIT_LIST_HEAD(&s->s_cap_releases);
e3ec8d68
YZ		 756 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
757
1cf03a68 758 INIT_LIST_HEAD(&s->s_cap_dirty);
2f2dc053 759 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053 760
2f2dc053 761 mdsc->sessions[mds] = s;
86d8f67b 762 atomic_inc(&mdsc->num_sessions);
3997c01d 763 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 764
b7a9e5dd
SW		 765 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
766 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 767
2f2dc053 768 return s;
42ce56e5
SW		 769
770fail_realloc:
771 kfree(s);
772 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 773}
774
775/*
776 * called under mdsc->mutex
777 */
2600d2dd 778static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 779 struct ceph_mds_session *s)
2f2dc053 780{
2600d2dd
SW		 781 dout("__unregister_session mds%d %p\n", s->s_mds, s);
782 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 783 mdsc->sessions[s->s_mds] = NULL;
784 ceph_con_close(&s->s_con);
785 ceph_put_mds_session(s);
86d8f67b 786 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 787}
788
789/*
790 * drop session refs in request.
791 *
792 * should be last request ref, or hold mdsc->mutex
793 */
794static void put_request_session(struct ceph_mds_request *req)
795{
796 if (req->r_session) {
797 ceph_put_mds_session(req->r_session);
798 req->r_session = NULL;
799 }
800}
801
153c8e6b 802void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 803{
153c8e6b
SW		 804 struct ceph_mds_request *req = container_of(kref,
805 struct ceph_mds_request,
806 r_kref);
e64f44a8 807 ceph_mdsc_release_dir_caps_no_check(req);
54008399 808 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 809 if (req->r_request)
810 ceph_msg_put(req->r_request);
54008399 811 if (req->r_reply)
153c8e6b 812 ceph_msg_put(req->r_reply);
153c8e6b 813 if (req->r_inode) {
41b02e1f 814 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3e1d0452
YZ		 815 /* avoid calling iput_final() in mds dispatch threads */
816 ceph_async_iput(req->r_inode);
153c8e6b 817 }
9c1c2b35 818 if (req->r_parent) {
3dd69aab 819 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
9c1c2b35
JL		 820 ceph_async_iput(req->r_parent);
821 }
3e1d0452 822 ceph_async_iput(req->r_target_inode);
153c8e6b
SW		 823 if (req->r_dentry)
824 dput(req->r_dentry);
844d87c3
SW		 825 if (req->r_old_dentry)
826 dput(req->r_old_dentry);
827 if (req->r_old_dentry_dir) {
41b02e1f
SW		 828 /*
829 * track (and drop pins for) r_old_dentry_dir
830 * separately, since r_old_dentry's d_parent may have
831 * changed between the dir mutex being dropped and
832 * this request being freed.
833 */
834 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
835 CEPH_CAP_PIN);
3e1d0452 836 ceph_async_iput(req->r_old_dentry_dir);
2f2dc053 837 }
153c8e6b
SW		 838 kfree(req->r_path1);
839 kfree(req->r_path2);
25e6bae3
YZ		 840 if (req->r_pagelist)
841 ceph_pagelist_release(req->r_pagelist);
153c8e6b 842 put_request_session(req);
37151668 843 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
428138c9 844 WARN_ON_ONCE(!list_empty(&req->r_wait));
058daab7 845 kmem_cache_free(ceph_mds_request_cachep, req);
2f2dc053
SW		 846}
847
fcd00b68
ID		 848DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
849
2f2dc053
SW		 850/*
851 * lookup session, bump ref if found.
852 *
853 * called under mdsc->mutex.
854 */
fcd00b68
ID		 855static struct ceph_mds_request *
856lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 857{
858 struct ceph_mds_request *req;
44ca18f2 859
fcd00b68
ID		 860 req = lookup_request(&mdsc->request_tree, tid);
861 if (req)
862 ceph_mdsc_get_request(req);
44ca18f2 863
fcd00b68 864 return req;
2f2dc053
SW		 865}
866
867/*
868 * Register an in-flight request, and assign a tid. Link to directory
869 * are modifying (if any).
870 *
871 * Called under mdsc->mutex.
872 */
873static void __register_request(struct ceph_mds_client *mdsc,
874 struct ceph_mds_request *req,
875 struct inode *dir)
876{
e30ee581
ZZ		 877 int ret = 0;
878
2f2dc053 879 req->r_tid = ++mdsc->last_tid;
e30ee581
ZZ		 880 if (req->r_num_caps) {
881 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
882 req->r_num_caps);
883 if (ret < 0) {
884 pr_err("__register_request %p "
885 "failed to reserve caps: %d\n", req, ret);
886 /* set req->r_err to fail early from __do_request */
887 req->r_err = ret;
888 return;
889 }
890 }
2f2dc053
SW		 891 dout("__register_request %p tid %lld\n", req, req->r_tid);
892 ceph_mdsc_get_request(req);
fcd00b68 893 insert_request(&mdsc->request_tree, req);
2f2dc053 894
cb4276cc
SW		 895 req->r_uid = current_fsuid();
896 req->r_gid = current_fsgid();
897
e8a7b8b1
YZ		 898 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
899 mdsc->oldest_tid = req->r_tid;
900
2f2dc053 901 if (dir) {
3db0a2fc
JL		 902 struct ceph_inode_info *ci = ceph_inode(dir);
903
3b663780 904 ihold(dir);
2f2dc053 905 req->r_unsafe_dir = dir;
3db0a2fc
JL		 906 spin_lock(&ci->i_unsafe_lock);
907 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
908 spin_unlock(&ci->i_unsafe_lock);
2f2dc053
SW		 909 }
910}
911
912static void __unregister_request(struct ceph_mds_client *mdsc,
913 struct ceph_mds_request *req)
914{
915 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
e8a7b8b1 916
df963ea8
JL		 917 /* Never leave an unregistered request on an unsafe list! */
918 list_del_init(&req->r_unsafe_item);
919
e8a7b8b1
YZ		 920 if (req->r_tid == mdsc->oldest_tid) {
921 struct rb_node *p = rb_next(&req->r_node);
922 mdsc->oldest_tid = 0;
923 while (p) {
924 struct ceph_mds_request *next_req =
925 rb_entry(p, struct ceph_mds_request, r_node);
926 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
927 mdsc->oldest_tid = next_req->r_tid;
928 break;
929 }
930 p = rb_next(p);
931 }
932 }
933
fcd00b68 934 erase_request(&mdsc->request_tree, req);
2f2dc053 935
3db0a2fc 936 if (req->r_unsafe_dir) {
2f2dc053 937 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 938 spin_lock(&ci->i_unsafe_lock);
939 list_del_init(&req->r_unsafe_dir_item);
940 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 941 }
bc2de10d
JL		 942 if (req->r_target_inode &&
943 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 944 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
945 spin_lock(&ci->i_unsafe_lock);
946 list_del_init(&req->r_unsafe_target_item);
947 spin_unlock(&ci->i_unsafe_lock);
948 }
3b663780 949
4c06ace8 950 if (req->r_unsafe_dir) {
3e1d0452
YZ		 951 /* avoid calling iput_final() in mds dispatch threads */
952 ceph_async_iput(req->r_unsafe_dir);
3b663780 953 req->r_unsafe_dir = NULL;
2f2dc053 954 }
94aa8ae1 955
fc55d2c9
YZ		 956 complete_all(&req->r_safe_completion);
957
94aa8ae1 958 ceph_mdsc_put_request(req);
2f2dc053
SW		 959}
960
30c71233
JL		 961/*
962 * Walk back up the dentry tree until we hit a dentry representing a
963 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
964 * when calling this) to ensure that the objects won't disappear while we're
965 * working with them. Once we hit a candidate dentry, we attempt to take a
966 * reference to it, and return that as the result.
967 */
f1075480
DC		 968static struct inode *get_nonsnap_parent(struct dentry *dentry)
969{
970 struct inode *inode = NULL;
30c71233
JL		 971
972 while (dentry && !IS_ROOT(dentry)) {
973 inode = d_inode_rcu(dentry);
974 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
975 break;
976 dentry = dentry->d_parent;
977 }
978 if (inode)
979 inode = igrab(inode);
980 return inode;
981}
982
2f2dc053
SW		 983/*
984 * Choose mds to send request to next. If there is a hint set in the
985 * request (e.g., due to a prior forward hint from the mds), use that.
986 * Otherwise, consult frag tree and/or caps to identify the
987 * appropriate mds. If all else fails, choose randomly.
988 *
989 * Called under mdsc->mutex.
990 */
991static int __choose_mds(struct ceph_mds_client *mdsc,
c4853e97
XL		 992 struct ceph_mds_request *req,
993 bool *random)
2f2dc053
SW		 994{
995 struct inode *inode;
996 struct ceph_inode_info *ci;
997 struct ceph_cap *cap;
998 int mode = req->r_direct_mode;
999 int mds = -1;
1000 u32 hash = req->r_direct_hash;
bc2de10d 1001 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
2f2dc053 1002
c4853e97
XL		 1003 if (random)
1004 *random = false;
1005
2f2dc053
SW		 1006 /*
1007 * is there a specific mds we should try? ignore hint if we have
1008 * no session and the mds is not up (active or recovering).
1009 */
1010 if (req->r_resend_mds >= 0 &&
1011 (__have_session(mdsc, req->r_resend_mds) ||
1012 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
3c802092 1013 dout("%s using resend_mds mds%d\n", __func__,
2f2dc053
SW		 1014 req->r_resend_mds);
1015 return req->r_resend_mds;
1016 }
1017
1018 if (mode == USE_RANDOM_MDS)
1019 goto random;
1020
1021 inode = NULL;
1022 if (req->r_inode) {
5d37ca14
YZ		 1023 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1024 inode = req->r_inode;
1025 ihold(inode);
1026 } else {
38f340cc
YZ		 1027 /* req->r_dentry is non-null for LSSNAP request */
1028 rcu_read_lock();
1029 inode = get_nonsnap_parent(req->r_dentry);
1030 rcu_read_unlock();
3c802092 1031 dout("%s using snapdir's parent %p\n", __func__, inode);
5d37ca14 1032 }
38f340cc 1033 } else if (req->r_dentry) {
d79698da 1034 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 1035 struct dentry *parent;
1036 struct inode *dir;
1037
1038 rcu_read_lock();
41883ba8 1039 parent = READ_ONCE(req->r_dentry->d_parent);
3dd69aab 1040 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 1041
30c71233
JL		 1042 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1043 /* not this fs or parent went negative */
2b0143b5 1044 inode = d_inode(req->r_dentry);
30c71233
JL		 1045 if (inode)
1046 ihold(inode);
eb6bb1c5
SW		 1047 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1048 /* direct snapped/virtual snapdir requests
1049 * based on parent dir inode */
30c71233 1050 inode = get_nonsnap_parent(parent);
3c802092 1051 dout("%s using nonsnap parent %p\n", __func__, inode);
ca18bede 1052 } else {
eb6bb1c5 1053 /* dentry target */
2b0143b5 1054 inode = d_inode(req->r_dentry);
ca18bede
YZ		 1055 if (!inode || mode == USE_AUTH_MDS) {
1056 /* dir + name */
30c71233 1057 inode = igrab(dir);
ca18bede
YZ		 1058 hash = ceph_dentry_hash(dir, req->r_dentry);
1059 is_hash = true;
30c71233
JL		 1060 } else {
1061 ihold(inode);
ca18bede 1062 }
2f2dc053 1063 }
30c71233 1064 rcu_read_unlock();
2f2dc053 1065 }
eb6bb1c5 1066
3c802092
XL		 1067 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1068 hash, mode);
2f2dc053
SW		 1069 if (!inode)
1070 goto random;
1071 ci = ceph_inode(inode);
1072
1073 if (is_hash && S_ISDIR(inode->i_mode)) {
1074 struct ceph_inode_frag frag;
1075 int found;
1076
1077 ceph_choose_frag(ci, hash, &frag, &found);
1078 if (found) {
1079 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1080 u8 r;
1081
1082 /* choose a random replica */
1083 get_random_bytes(&r, 1);
1084 r %= frag.ndist;
1085 mds = frag.dist[r];
3c802092
XL		 1086 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1087 __func__, inode, ceph_vinop(inode),
1088 frag.frag, mds, (int)r, frag.ndist);
d66bbd44 1089 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f
XL		 1090 CEPH_MDS_STATE_ACTIVE &&
1091 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
30c71233 1092 goto out;
2f2dc053
SW		 1093 }
1094
1095 /* since this file/dir wasn't known to be
1096 * replicated, then we want to look for the
1097 * authoritative mds. */
2f2dc053
SW		 1098 if (frag.mds >= 0) {
1099 /* choose auth mds */
1100 mds = frag.mds;
3c802092
XL		 1101 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1102 __func__, inode, ceph_vinop(inode),
1103 frag.frag, mds);
d66bbd44 1104 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f
XL		 1105 CEPH_MDS_STATE_ACTIVE) {
1106 if (mode == USE_ANY_MDS &&
1107 !ceph_mdsmap_is_laggy(mdsc->mdsmap,
1108 mds))
1109 goto out;
1110 }
2f2dc053 1111 }
5d47648f 1112 mode = USE_AUTH_MDS;
2f2dc053
SW		 1113 }
1114 }
1115
be655596 1116 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1117 cap = NULL;
1118 if (mode == USE_AUTH_MDS)
1119 cap = ci->i_auth_cap;
1120 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1121 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1122 if (!cap) {
be655596 1123 spin_unlock(&ci->i_ceph_lock);
3e1d0452 1124 ceph_async_iput(inode);
2f2dc053
SW		 1125 goto random;
1126 }
1127 mds = cap->session->s_mds;
3c802092 1128 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
2f2dc053
SW		 1129 inode, ceph_vinop(inode), mds,
1130 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 1131 spin_unlock(&ci->i_ceph_lock);
30c71233 1132out:
3e1d0452
YZ		 1133 /* avoid calling iput_final() while holding mdsc->mutex or
1134 * in mds dispatch threads */
1135 ceph_async_iput(inode);
2f2dc053
SW		 1136 return mds;
1137
1138random:
c4853e97
XL		 1139 if (random)
1140 *random = true;
1141
2f2dc053 1142 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
3c802092 1143 dout("%s chose random mds%d\n", __func__, mds);
2f2dc053
SW		 1144 return mds;
1145}
1146
1147
1148/*
1149 * session messages
1150 */
1151static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1152{
1153 struct ceph_msg *msg;
1154 struct ceph_mds_session_head *h;
1155
b61c2763
SW		 1156 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1157 false);
a79832f2 1158 if (!msg) {
2f2dc053 1159 pr_err("create_session_msg ENOMEM creating msg\n");
a79832f2 1160 return NULL;
2f2dc053
SW		 1161 }
1162 h = msg->front.iov_base;
1163 h->op = cpu_to_le32(op);
1164 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 1165
1166 return msg;
1167}
1168
9ba1e224
XL		 1169static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1170#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
342ce182
YZ		 1171static void encode_supported_features(void **p, void *end)
1172{
9ba1e224 1173 static const size_t count = ARRAY_SIZE(feature_bits);
342ce182
YZ		 1174
1175 if (count > 0) {
1176 size_t i;
9ba1e224 1177 size_t size = FEATURE_BYTES(count);
342ce182
YZ		 1178
1179 BUG_ON(*p + 4 + size > end);
1180 ceph_encode_32(p, size);
1181 memset(*p, 0, size);
1182 for (i = 0; i < count; i++)
9ba1e224 1183 ((unsigned char*)(*p))[i / 8] |= BIT(feature_bits[i] % 8);
342ce182
YZ		 1184 *p += size;
1185 } else {
1186 BUG_ON(*p + 4 > end);
1187 ceph_encode_32(p, 0);
1188 }
1189}
1190
dbd0c8bf
JS		 1191/*
1192 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1193 * to include additional client metadata fields.
1194 */
1195static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1196{
1197 struct ceph_msg *msg;
1198 struct ceph_mds_session_head *h;
1199 int i = -1;
342ce182 1200 int extra_bytes = 0;
dbd0c8bf
JS		 1201 int metadata_key_count = 0;
1202 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 1203 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
9ba1e224 1204 size_t size, count;
342ce182 1205 void *p, *end;
dbd0c8bf 1206
a6a5ce4f 1207 const char* metadata[][2] = {
717e6f28
YZ		 1208 {"hostname", mdsc->nodename},
1209 {"kernel_version", init_utsname()->release},
3f384954
YZ		 1210 {"entity_id", opt->name ? : ""},
1211 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 1212 {NULL, NULL}
1213 };
1214
1215 /* Calculate serialized length of metadata */
342ce182 1216 extra_bytes = 4; /* map length */
d37b1d99 1217 for (i = 0; metadata[i][0]; ++i) {
342ce182 1218 extra_bytes += 8 + strlen(metadata[i][0]) +
dbd0c8bf
JS		 1219 strlen(metadata[i][1]);
1220 metadata_key_count++;
1221 }
9ba1e224 1222
342ce182 1223 /* supported feature */
9ba1e224
XL		 1224 size = 0;
1225 count = ARRAY_SIZE(feature_bits);
1226 if (count > 0)
1227 size = FEATURE_BYTES(count);
1228 extra_bytes += 4 + size;
dbd0c8bf
JS		 1229
1230 /* Allocate the message */
342ce182 1231 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
dbd0c8bf
JS		 1232 GFP_NOFS, false);
1233 if (!msg) {
1234 pr_err("create_session_msg ENOMEM creating msg\n");
1235 return NULL;
1236 }
342ce182
YZ		 1237 p = msg->front.iov_base;
1238 end = p + msg->front.iov_len;
1239
1240 h = p;
dbd0c8bf
JS		 1241 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1242 h->seq = cpu_to_le64(seq);
1243
1244 /*
1245 * Serialize client metadata into waiting buffer space, using
1246 * the format that userspace expects for map<string, string>
7cfa0313 1247 *
9ba1e224 1248 * ClientSession messages with metadata are v3
dbd0c8bf 1249 */
342ce182 1250 msg->hdr.version = cpu_to_le16(3);
7cfa0313 1251 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 1252
1253 /* The write pointer, following the session_head structure */
342ce182 1254 p += sizeof(*h);
dbd0c8bf
JS		 1255
1256 /* Number of entries in the map */
1257 ceph_encode_32(&p, metadata_key_count);
1258
1259 /* Two length-prefixed strings for each entry in the map */
d37b1d99 1260 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 1261 size_t const key_len = strlen(metadata[i][0]);
1262 size_t const val_len = strlen(metadata[i][1]);
1263
1264 ceph_encode_32(&p, key_len);
1265 memcpy(p, metadata[i][0], key_len);
1266 p += key_len;
1267 ceph_encode_32(&p, val_len);
1268 memcpy(p, metadata[i][1], val_len);
1269 p += val_len;
1270 }
1271
342ce182
YZ		 1272 encode_supported_features(&p, end);
1273 msg->front.iov_len = p - msg->front.iov_base;
1274 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1275
2f2dc053
SW		 1276 return msg;
1277}
1278
1279/*
1280 * send session open request.
1281 *
1282 * called under mdsc->mutex
1283 */
1284static int __open_session(struct ceph_mds_client *mdsc,
1285 struct ceph_mds_session *session)
1286{
1287 struct ceph_msg *msg;
1288 int mstate;
1289 int mds = session->s_mds;
2f2dc053
SW		 1290
1291 /* wait for mds to go active? */
1292 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1293 dout("open_session to mds%d (%s)\n", mds,
1294 ceph_mds_state_name(mstate));
1295 session->s_state = CEPH_MDS_SESSION_OPENING;
1296 session->s_renew_requested = jiffies;
1297
1298 /* send connect message */
dbd0c8bf 1299 msg = create_session_open_msg(mdsc, session->s_seq);
a79832f2
SW		 1300 if (!msg)
1301 return -ENOMEM;
2f2dc053 1302 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 1303 return 0;
1304}
1305
ed0552a1
SW		 1306/*
1307 * open sessions for any export targets for the given mds
1308 *
1309 * called under mdsc->mutex
1310 */
5d72d13c
YZ		 1311static struct ceph_mds_session *
1312__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1313{
1314 struct ceph_mds_session *session;
1315
1316 session = __ceph_lookup_mds_session(mdsc, target);
1317 if (!session) {
1318 session = register_session(mdsc, target);
1319 if (IS_ERR(session))
1320 return session;
1321 }
1322 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1323 session->s_state == CEPH_MDS_SESSION_CLOSING)
1324 __open_session(mdsc, session);
1325
1326 return session;
1327}
1328
1329struct ceph_mds_session *
1330ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1331{
1332 struct ceph_mds_session *session;
1333
1334 dout("open_export_target_session to mds%d\n", target);
1335
1336 mutex_lock(&mdsc->mutex);
1337 session = __open_export_target_session(mdsc, target);
1338 mutex_unlock(&mdsc->mutex);
1339
1340 return session;
1341}
1342
ed0552a1
SW		 1343static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1344 struct ceph_mds_session *session)
1345{
1346 struct ceph_mds_info *mi;
1347 struct ceph_mds_session *ts;
1348 int i, mds = session->s_mds;
ed0552a1 1349
b38c9eb4 1350 if (mds >= mdsc->mdsmap->possible_max_rank)
ed0552a1 1351 return;
5d72d13c 1352
ed0552a1
SW		 1353 mi = &mdsc->mdsmap->m_info[mds];
1354 dout("open_export_target_sessions for mds%d (%d targets)\n",
1355 session->s_mds, mi->num_export_targets);
1356
1357 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c
YZ		 1358 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1359 if (!IS_ERR(ts))
1360 ceph_put_mds_session(ts);
ed0552a1
SW		 1361 }
1362}
1363
154f42c2
SW		 1364void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1365 struct ceph_mds_session *session)
1366{
1367 mutex_lock(&mdsc->mutex);
1368 __open_export_target_sessions(mdsc, session);
1369 mutex_unlock(&mdsc->mutex);
1370}
1371
2f2dc053
SW		 1372/*
1373 * session caps
1374 */
1375
c8a96a31
JL		 1376static void detach_cap_releases(struct ceph_mds_session *session,
1377 struct list_head *target)
2f2dc053 1378{
c8a96a31
JL		 1379 lockdep_assert_held(&session->s_cap_lock);
1380
1381 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1382 session->s_num_cap_releases = 0;
c8a96a31
JL		 1383 dout("dispose_cap_releases mds%d\n", session->s_mds);
1384}
2f2dc053 1385
c8a96a31
JL		 1386static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1387 struct list_head *dispose)
1388{
1389 while (!list_empty(dispose)) {
745a8e3b
YZ		 1390 struct ceph_cap *cap;
1391 /* zero out the in-progress message */
c8a96a31 1392 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1393 list_del(&cap->session_caps);
1394 ceph_put_cap(mdsc, cap);
2f2dc053 1395 }
2f2dc053
SW		 1396}
1397
1c841a96
YZ		 1398static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1399 struct ceph_mds_session *session)
1400{
1401 struct ceph_mds_request *req;
1402 struct rb_node *p;
f4b97866 1403 struct ceph_inode_info *ci;
1c841a96
YZ		 1404
1405 dout("cleanup_session_requests mds%d\n", session->s_mds);
1406 mutex_lock(&mdsc->mutex);
1407 while (!list_empty(&session->s_unsafe)) {
1408 req = list_first_entry(&session->s_unsafe,
1409 struct ceph_mds_request, r_unsafe_item);
3e0708b9
YZ		 1410 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1411 req->r_tid);
f4b97866
YZ		 1412 if (req->r_target_inode) {
1413 /* dropping unsafe change of inode's attributes */
1414 ci = ceph_inode(req->r_target_inode);
1415 errseq_set(&ci->i_meta_err, -EIO);
1416 }
1417 if (req->r_unsafe_dir) {
1418 /* dropping unsafe directory operation */
1419 ci = ceph_inode(req->r_unsafe_dir);
1420 errseq_set(&ci->i_meta_err, -EIO);
1421 }
1c841a96
YZ		 1422 __unregister_request(mdsc, req);
1423 }
1424 /* zero r_attempts, so kick_requests() will re-send requests */
1425 p = rb_first(&mdsc->request_tree);
1426 while (p) {
1427 req = rb_entry(p, struct ceph_mds_request, r_node);
1428 p = rb_next(p);
1429 if (req->r_session &&
1430 req->r_session->s_mds == session->s_mds)
1431 req->r_attempts = 0;
1432 }
1433 mutex_unlock(&mdsc->mutex);
1434}
1435
2f2dc053 1436/*
f818a736
SW		 1437 * Helper to safely iterate over all caps associated with a session, with
1438 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1439 *
f818a736 1440 * Caller must hold session s_mutex.
2f2dc053 1441 */
f5d77269
JL		 1442int ceph_iterate_session_caps(struct ceph_mds_session *session,
1443 int (*cb)(struct inode *, struct ceph_cap *,
1444 void *), void *arg)
2f2dc053 1445{
7c1332b8
SW		 1446 struct list_head *p;
1447 struct ceph_cap *cap;
1448 struct inode *inode, *last_inode = NULL;
1449 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1450 int ret;
1451
1452 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1453 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1454 p = session->s_caps.next;
1455 while (p != &session->s_caps) {
1456 cap = list_entry(p, struct ceph_cap, session_caps);
2f2dc053 1457 inode = igrab(&cap->ci->vfs_inode);
7c1332b8
SW		 1458 if (!inode) {
1459 p = p->next;
2f2dc053 1460 continue;
7c1332b8
SW		 1461 }
1462 session->s_cap_iterator = cap;
2f2dc053 1463 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1464
1465 if (last_inode) {
3e1d0452
YZ		 1466 /* avoid calling iput_final() while holding
1467 * s_mutex or in mds dispatch threads */
1468 ceph_async_iput(last_inode);
7c1332b8
SW		 1469 last_inode = NULL;
1470 }
1471 if (old_cap) {
37151668 1472 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1473 old_cap = NULL;
1474 }
1475
2f2dc053 1476 ret = cb(inode, cap, arg);
7c1332b8
SW		 1477 last_inode = inode;
1478
2f2dc053 1479 spin_lock(&session->s_cap_lock);
7c1332b8 1480 p = p->next;
d37b1d99 1481 if (!cap->ci) {
7c1332b8
SW		 1482 dout("iterate_session_caps finishing cap %p removal\n",
1483 cap);
1484 BUG_ON(cap->session != session);
745a8e3b 1485 cap->session = NULL;
7c1332b8
SW		 1486 list_del_init(&cap->session_caps);
1487 session->s_nr_caps--;
e3ec8d68
YZ		 1488 if (cap->queue_release)
1489 __ceph_queue_cap_release(session, cap);
1490 else
745a8e3b 1491 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1492 }
5dacf091
SW		 1493 if (ret < 0)
1494 goto out;
2f2dc053 1495 }
5dacf091
SW		 1496 ret = 0;
1497out:
7c1332b8 1498 session->s_cap_iterator = NULL;
2f2dc053 1499 spin_unlock(&session->s_cap_lock);
7c1332b8 1500
3e1d0452 1501 ceph_async_iput(last_inode);
7c1332b8 1502 if (old_cap)
37151668 1503 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1504
5dacf091 1505 return ret;
2f2dc053
SW		 1506}
1507
1508static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
6c99f254 1509 void *arg)
2f2dc053 1510{
6c93df5d 1511 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
2f2dc053 1512 struct ceph_inode_info *ci = ceph_inode(inode);
553adfd9 1513 LIST_HEAD(to_remove);
f4b97866 1514 bool dirty_dropped = false;
6c93df5d 1515 bool invalidate = false;
6c99f254 1516
2f2dc053
SW		 1517 dout("removing cap %p, ci is %p, inode is %p\n",
1518 cap, ci, &ci->vfs_inode);
be655596 1519 spin_lock(&ci->i_ceph_lock);
a096b09a 1520 __ceph_remove_cap(cap, false);
571ade33 1521 if (!ci->i_auth_cap) {
553adfd9 1522 struct ceph_cap_flush *cf;
6c93df5d 1523 struct ceph_mds_client *mdsc = fsc->mdsc;
6c99f254 1524
d468e729
YZ		 1525 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1526 if (inode->i_data.nrpages > 0)
1527 invalidate = true;
1528 if (ci->i_wrbuffer_ref > 0)
1529 mapping_set_error(&inode->i_data, -EIO);
1530 }
6c93df5d 1531
e4500b5e
YZ		 1532 while (!list_empty(&ci->i_cap_flush_list)) {
1533 cf = list_first_entry(&ci->i_cap_flush_list,
1534 struct ceph_cap_flush, i_list);
8cdcc07d 1535 list_move(&cf->i_list, &to_remove);
553adfd9
YZ		 1536 }
1537
6c99f254 1538 spin_lock(&mdsc->cap_dirty_lock);
8310b089 1539
e4500b5e
YZ		 1540 list_for_each_entry(cf, &to_remove, i_list)
1541 list_del(&cf->g_list);
8310b089 1542
6c99f254 1543 if (!list_empty(&ci->i_dirty_item)) {
3e0708b9
YZ		 1544 pr_warn_ratelimited(
1545 " dropping dirty %s state for %p %lld\n",
6c99f254
SW		 1546 ceph_cap_string(ci->i_dirty_caps),
1547 inode, ceph_ino(inode));
1548 ci->i_dirty_caps = 0;
1549 list_del_init(&ci->i_dirty_item);
f4b97866 1550 dirty_dropped = true;
6c99f254
SW		 1551 }
1552 if (!list_empty(&ci->i_flushing_item)) {
3e0708b9
YZ		 1553 pr_warn_ratelimited(
1554 " dropping dirty+flushing %s state for %p %lld\n",
6c99f254
SW		 1555 ceph_cap_string(ci->i_flushing_caps),
1556 inode, ceph_ino(inode));
1557 ci->i_flushing_caps = 0;
1558 list_del_init(&ci->i_flushing_item);
1559 mdsc->num_cap_flushing--;
f4b97866 1560 dirty_dropped = true;
6c99f254 1561 }
6c99f254 1562 spin_unlock(&mdsc->cap_dirty_lock);
553adfd9 1563
f4b97866
YZ		 1564 if (dirty_dropped) {
1565 errseq_set(&ci->i_meta_err, -EIO);
1566
1567 if (ci->i_wrbuffer_ref_head == 0 &&
1568 ci->i_wr_ref == 0 &&
1569 ci->i_dirty_caps == 0 &&
1570 ci->i_flushing_caps == 0) {
1571 ceph_put_snap_context(ci->i_head_snapc);
1572 ci->i_head_snapc = NULL;
1573 }
1574 }
1575
b3f8d68f
YZ		 1576 if (atomic_read(&ci->i_filelock_ref) > 0) {
1577 /* make further file lock syscall return -EIO */
1578 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1579 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1580 inode, ceph_ino(inode));
1581 }
1582
f66fd9f0 1583 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
e4500b5e 1584 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
f66fd9f0
YZ		 1585 ci->i_prealloc_cap_flush = NULL;
1586 }
6c99f254 1587 }
be655596 1588 spin_unlock(&ci->i_ceph_lock);
553adfd9
YZ		 1589 while (!list_empty(&to_remove)) {
1590 struct ceph_cap_flush *cf;
1591 cf = list_first_entry(&to_remove,
e4500b5e
YZ		 1592 struct ceph_cap_flush, i_list);
1593 list_del(&cf->i_list);
f66fd9f0 1594 ceph_free_cap_flush(cf);
553adfd9 1595 }
77310320
YZ		 1596
1597 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1598 if (invalidate)
1599 ceph_queue_invalidate(inode);
f4b97866 1600 if (dirty_dropped)
6c99f254 1601 iput(inode);
2f2dc053
SW		 1602 return 0;
1603}
1604
1605/*
1606 * caller must hold session s_mutex
1607 */
1608static void remove_session_caps(struct ceph_mds_session *session)
1609{
6c93df5d
YZ		 1610 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1611 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1612 LIST_HEAD(dispose);
1613
2f2dc053 1614 dout("remove_session_caps on %p\n", session);
f5d77269 1615 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1616
c8799fc4
YZ		 1617 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1618
6f60f889
YZ		 1619 spin_lock(&session->s_cap_lock);
1620 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1621 struct inode *inode;
1622 struct ceph_cap *cap, *prev = NULL;
1623 struct ceph_vino vino;
1624 /*
1625 * iterate_session_caps() skips inodes that are being
1626 * deleted, we need to wait until deletions are complete.
1627 * __wait_on_freeing_inode() is designed for the job,
1628 * but it is not exported, so use lookup inode function
1629 * to access it.
1630 */
1631 while (!list_empty(&session->s_caps)) {
1632 cap = list_entry(session->s_caps.next,
1633 struct ceph_cap, session_caps);
1634 if (cap == prev)
1635 break;
1636 prev = cap;
1637 vino = cap->ci->i_vino;
1638 spin_unlock(&session->s_cap_lock);
1639
ed284c49 1640 inode = ceph_find_inode(sb, vino);
3e1d0452
YZ		 1641 /* avoid calling iput_final() while holding s_mutex */
1642 ceph_async_iput(inode);
6f60f889
YZ		 1643
1644 spin_lock(&session->s_cap_lock);
1645 }
1646 }
745a8e3b
YZ		 1647
1648 // drop cap expires and unlock s_cap_lock
c8a96a31 1649 detach_cap_releases(session, &dispose);
6f60f889 1650
2f2dc053 1651 BUG_ON(session->s_nr_caps > 0);
6c99f254 1652 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1653 spin_unlock(&session->s_cap_lock);
1654 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1655}
1656
d2f8bb27
YZ		 1657enum {
1658 RECONNECT,
1659 RENEWCAPS,
1660 FORCE_RO,
1661};
1662
2f2dc053
SW		 1663/*
1664 * wake up any threads waiting on this session's caps. if the cap is
1665 * old (didn't get renewed on the client reconnect), remove it now.
1666 *
1667 * caller must hold s_mutex.
1668 */
1669static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1670 void *arg)
1671{
0dc2570f 1672 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1673 unsigned long ev = (unsigned long)arg;
0dc2570f 1674
d2f8bb27 1675 if (ev == RECONNECT) {
be655596 1676 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1677 ci->i_wanted_max_size = 0;
1678 ci->i_requested_max_size = 0;
be655596 1679 spin_unlock(&ci->i_ceph_lock);
d2f8bb27
YZ		 1680 } else if (ev == RENEWCAPS) {
1681 if (cap->cap_gen < cap->session->s_cap_gen) {
1682 /* mds did not re-issue stale cap */
1683 spin_lock(&ci->i_ceph_lock);
1684 cap->issued = cap->implemented = CEPH_CAP_PIN;
d2f8bb27
YZ		 1685 spin_unlock(&ci->i_ceph_lock);
1686 }
1687 } else if (ev == FORCE_RO) {
0dc2570f 1688 }
e5360309 1689 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1690 return 0;
1691}
1692
d2f8bb27 1693static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053
SW		 1694{
1695 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
f5d77269
JL		 1696 ceph_iterate_session_caps(session, wake_up_session_cb,
1697 (void *)(unsigned long)ev);
2f2dc053
SW		 1698}
1699
1700/*
1701 * Send periodic message to MDS renewing all currently held caps. The
1702 * ack will reset the expiration for all caps from this session.
1703 *
1704 * caller holds s_mutex
1705 */
1706static int send_renew_caps(struct ceph_mds_client *mdsc,
1707 struct ceph_mds_session *session)
1708{
1709 struct ceph_msg *msg;
1710 int state;
1711
1712 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1713 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1714 pr_info("mds%d caps stale\n", session->s_mds);
e4cb4cb8 1715 session->s_renew_requested = jiffies;
2f2dc053
SW		 1716
1717 /* do not try to renew caps until a recovering mds has reconnected
1718 * with its clients. */
1719 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1720 if (state < CEPH_MDS_STATE_RECONNECT) {
1721 dout("send_renew_caps ignoring mds%d (%s)\n",
1722 session->s_mds, ceph_mds_state_name(state));
1723 return 0;
1724 }
1725
1726 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1727 ceph_mds_state_name(state));
2f2dc053
SW		 1728 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1729 ++session->s_renew_seq);
a79832f2
SW		 1730 if (!msg)
1731 return -ENOMEM;
2f2dc053
SW		 1732 ceph_con_send(&session->s_con, msg);
1733 return 0;
1734}
1735
186e4f7a
YZ		 1736static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1737 struct ceph_mds_session *session, u64 seq)
1738{
1739 struct ceph_msg *msg;
1740
1741 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
a687ecaf 1742 session->s_mds, ceph_session_state_name(session->s_state), seq);
186e4f7a
YZ		 1743 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1744 if (!msg)
1745 return -ENOMEM;
1746 ceph_con_send(&session->s_con, msg);
1747 return 0;
1748}
1749
1750
2f2dc053
SW		 1751/*
1752 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 1753 *
1754 * Called under session->s_mutex
2f2dc053
SW		 1755 */
1756static void renewed_caps(struct ceph_mds_client *mdsc,
1757 struct ceph_mds_session *session, int is_renew)
1758{
1759 int was_stale;
1760 int wake = 0;
1761
1762 spin_lock(&session->s_cap_lock);
1ce208a6 1763 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 1764
1765 session->s_cap_ttl = session->s_renew_requested +
1766 mdsc->mdsmap->m_session_timeout*HZ;
1767
1768 if (was_stale) {
1769 if (time_before(jiffies, session->s_cap_ttl)) {
1770 pr_info("mds%d caps renewed\n", session->s_mds);
1771 wake = 1;
1772 } else {
1773 pr_info("mds%d caps still stale\n", session->s_mds);
1774 }
1775 }
1776 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1777 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1778 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1779 spin_unlock(&session->s_cap_lock);
1780
1781 if (wake)
d2f8bb27 1782 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 1783}
1784
1785/*
1786 * send a session close request
1787 */
1788static int request_close_session(struct ceph_mds_client *mdsc,
1789 struct ceph_mds_session *session)
1790{
1791 struct ceph_msg *msg;
2f2dc053
SW		 1792
1793 dout("request_close_session mds%d state %s seq %lld\n",
a687ecaf 1794 session->s_mds, ceph_session_state_name(session->s_state),
2f2dc053
SW		 1795 session->s_seq);
1796 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
a79832f2
SW		 1797 if (!msg)
1798 return -ENOMEM;
1799 ceph_con_send(&session->s_con, msg);
fcff415c 1800 return 1;
2f2dc053
SW		 1801}
1802
1803/*
1804 * Called with s_mutex held.
1805 */
1806static int __close_session(struct ceph_mds_client *mdsc,
1807 struct ceph_mds_session *session)
1808{
1809 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1810 return 0;
1811 session->s_state = CEPH_MDS_SESSION_CLOSING;
1812 return request_close_session(mdsc, session);
1813}
1814
040d7860
YZ		 1815static bool drop_negative_children(struct dentry *dentry)
1816{
1817 struct dentry *child;
1818 bool all_negative = true;
1819
1820 if (!d_is_dir(dentry))
1821 goto out;
1822
1823 spin_lock(&dentry->d_lock);
1824 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1825 if (d_really_is_positive(child)) {
1826 all_negative = false;
1827 break;
1828 }
1829 }
1830 spin_unlock(&dentry->d_lock);
1831
1832 if (all_negative)
1833 shrink_dcache_parent(dentry);
1834out:
1835 return all_negative;
1836}
1837
2f2dc053
SW		 1838/*
1839 * Trim old(er) caps.
1840 *
1841 * Because we can't cache an inode without one or more caps, we do
1842 * this indirectly: if a cap is unused, we prune its aliases, at which
1843 * point the inode will hopefully get dropped to.
1844 *
1845 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1846 * memory pressure from the MDS, though, so it needn't be perfect.
1847 */
1848static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1849{
533a2818 1850 int *remaining = arg;
2f2dc053 1851 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 1852 int used, wanted, oissued, mine;
2f2dc053 1853
533a2818 1854 if (*remaining <= 0)
2f2dc053
SW		 1855 return -1;
1856
be655596 1857 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1858 mine = cap->issued | cap->implemented;
1859 used = __ceph_caps_used(ci);
979abfdd 1860 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 1861 oissued = __ceph_caps_issued_other(ci, cap);
1862
979abfdd 1863 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2f2dc053 1864 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
979abfdd
YZ		 1865 ceph_cap_string(used), ceph_cap_string(wanted));
1866 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 1867 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1868 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 1869 goto out;
1870 if ((used | wanted) & CEPH_CAP_ANY_WR)
1871 goto out;
89aa5930
YZ		 1872 /* Note: it's possible that i_filelock_ref becomes non-zero
1873 * after dropping auth caps. It doesn't hurt because reply
1874 * of lock mds request will re-add auth caps. */
1875 if (atomic_read(&ci->i_filelock_ref) > 0)
1876 goto out;
979abfdd 1877 }
5e804ac4
YZ		 1878 /* The inode has cached pages, but it's no longer used.
1879 * we can safely drop it */
525d15e8
YZ		 1880 if (S_ISREG(inode->i_mode) &&
1881 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
5e804ac4
YZ		 1882 !(oissued & CEPH_CAP_FILE_CACHE)) {
1883 used = 0;
1884 oissued = 0;
1885 }
979abfdd 1886 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 1887 goto out; /* we need these caps */
1888
2f2dc053
SW		 1889 if (oissued) {
1890 /* we aren't the only cap.. just remove us */
a096b09a 1891 __ceph_remove_cap(cap, true);
533a2818 1892 (*remaining)--;
2f2dc053 1893 } else {
040d7860 1894 struct dentry *dentry;
5e804ac4 1895 /* try dropping referring dentries */
be655596 1896 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 1897 dentry = d_find_any_alias(inode);
1898 if (dentry && drop_negative_children(dentry)) {
1899 int count;
1900 dput(dentry);
1901 d_prune_aliases(inode);
1902 count = atomic_read(&inode->i_count);
1903 if (count == 1)
533a2818 1904 (*remaining)--;
040d7860
YZ		 1905 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1906 inode, cap, count);
1907 } else {
1908 dput(dentry);
1909 }
2f2dc053
SW		 1910 return 0;
1911 }
1912
1913out:
be655596 1914 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 1915 return 0;
1916}
1917
1918/*
1919 * Trim session cap count down to some max number.
1920 */
e30ee581
ZZ		 1921int ceph_trim_caps(struct ceph_mds_client *mdsc,
1922 struct ceph_mds_session *session,
1923 int max_caps)
2f2dc053
SW		 1924{
1925 int trim_caps = session->s_nr_caps - max_caps;
1926
1927 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1928 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1929 if (trim_caps > 0) {
533a2818
JL		 1930 int remaining = trim_caps;
1931
1932 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2f2dc053
SW		 1933 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1934 session->s_mds, session->s_nr_caps, max_caps,
533a2818 1935 trim_caps - remaining);
2f2dc053 1936 }
a56371d9 1937
e3ec8d68 1938 ceph_flush_cap_releases(mdsc, session);
2f2dc053
SW		 1939 return 0;
1940}
1941
8310b089
YZ		 1942static int check_caps_flush(struct ceph_mds_client *mdsc,
1943 u64 want_flush_tid)
1944{
8310b089
YZ		 1945 int ret = 1;
1946
1947 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 1948 if (!list_empty(&mdsc->cap_flush_list)) {
1949 struct ceph_cap_flush *cf =
1950 list_first_entry(&mdsc->cap_flush_list,
1951 struct ceph_cap_flush, g_list);
1952 if (cf->tid <= want_flush_tid) {
1953 dout("check_caps_flush still flushing tid "
1954 "%llu <= %llu\n", cf->tid, want_flush_tid);
1955 ret = 0;
1956 }
8310b089
YZ		 1957 }
1958 spin_unlock(&mdsc->cap_dirty_lock);
1959 return ret;
d3383a8e
YZ		 1960}
1961
2f2dc053
SW		 1962/*
1963 * flush all dirty inode data to disk.
1964 *
8310b089 1965 * returns true if we've flushed through want_flush_tid
2f2dc053 1966 */
affbc19a 1967static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 1968 u64 want_flush_tid)
2f2dc053 1969{
0e294387 1970 dout("check_caps_flush want %llu\n", want_flush_tid);
8310b089
YZ		 1971
1972 wait_event(mdsc->cap_flushing_wq,
1973 check_caps_flush(mdsc, want_flush_tid));
1974
1975 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 1976}
1977
1978/*
1979 * called under s_mutex
1980 */
e3ec8d68
YZ		 1981static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1982 struct ceph_mds_session *session)
2f2dc053 1983{
745a8e3b
YZ		 1984 struct ceph_msg *msg = NULL;
1985 struct ceph_mds_cap_release *head;
1986 struct ceph_mds_cap_item *item;
92475f05 1987 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 1988 struct ceph_cap *cap;
1989 LIST_HEAD(tmp_list);
1990 int num_cap_releases;
92475f05
JL		 1991 __le32 barrier, *cap_barrier;
1992
1993 down_read(&osdc->lock);
1994 barrier = cpu_to_le32(osdc->epoch_barrier);
1995 up_read(&osdc->lock);
2f2dc053 1996
0f8605f2 1997 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 1998again:
1999 list_splice_init(&session->s_cap_releases, &tmp_list);
2000 num_cap_releases = session->s_num_cap_releases;
2001 session->s_num_cap_releases = 0;
2f2dc053 2002 spin_unlock(&session->s_cap_lock);
e01a5946 2003
745a8e3b
YZ		 2004 while (!list_empty(&tmp_list)) {
2005 if (!msg) {
2006 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 2007 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 2008 if (!msg)
2009 goto out_err;
2010 head = msg->front.iov_base;
2011 head->num = cpu_to_le32(0);
2012 msg->front.iov_len = sizeof(*head);
92475f05
JL		 2013
2014 msg->hdr.version = cpu_to_le16(2);
2015 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 2016 }
92475f05 2017
745a8e3b
YZ		 2018 cap = list_first_entry(&tmp_list, struct ceph_cap,
2019 session_caps);
2020 list_del(&cap->session_caps);
2021 num_cap_releases--;
e01a5946 2022
00bd8edb 2023 head = msg->front.iov_base;
4198aba4
JL		 2024 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2025 &head->num);
745a8e3b
YZ		 2026 item = msg->front.iov_base + msg->front.iov_len;
2027 item->ino = cpu_to_le64(cap->cap_ino);
2028 item->cap_id = cpu_to_le64(cap->cap_id);
2029 item->migrate_seq = cpu_to_le32(cap->mseq);
2030 item->seq = cpu_to_le32(cap->issue_seq);
2031 msg->front.iov_len += sizeof(*item);
2032
2033 ceph_put_cap(mdsc, cap);
2034
2035 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 2036 // Append cap_barrier field
2037 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2038 *cap_barrier = barrier;
2039 msg->front.iov_len += sizeof(*cap_barrier);
2040
745a8e3b
YZ		 2041 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2042 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2043 ceph_con_send(&session->s_con, msg);
2044 msg = NULL;
2045 }
00bd8edb 2046 }
e01a5946 2047
745a8e3b 2048 BUG_ON(num_cap_releases != 0);
e01a5946 2049
745a8e3b
YZ		 2050 spin_lock(&session->s_cap_lock);
2051 if (!list_empty(&session->s_cap_releases))
2052 goto again;
2053 spin_unlock(&session->s_cap_lock);
2054
2055 if (msg) {
92475f05
JL		 2056 // Append cap_barrier field
2057 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2058 *cap_barrier = barrier;
2059 msg->front.iov_len += sizeof(*cap_barrier);
2060
745a8e3b
YZ		 2061 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2062 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2063 ceph_con_send(&session->s_con, msg);
e01a5946 2064 }
745a8e3b
YZ		 2065 return;
2066out_err:
2067 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2068 session->s_mds);
2069 spin_lock(&session->s_cap_lock);
2070 list_splice(&tmp_list, &session->s_cap_releases);
2071 session->s_num_cap_releases += num_cap_releases;
2072 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 2073}
2074
e3ec8d68
YZ		 2075static void ceph_cap_release_work(struct work_struct *work)
2076{
2077 struct ceph_mds_session *session =
2078 container_of(work, struct ceph_mds_session, s_cap_release_work);
2079
2080 mutex_lock(&session->s_mutex);
2081 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2082 session->s_state == CEPH_MDS_SESSION_HUNG)
2083 ceph_send_cap_releases(session->s_mdsc, session);
2084 mutex_unlock(&session->s_mutex);
2085 ceph_put_mds_session(session);
2086}
2087
2088void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2089 struct ceph_mds_session *session)
2090{
2091 if (mdsc->stopping)
2092 return;
2093
5b3248c6 2094 ceph_get_mds_session(session);
e3ec8d68
YZ		 2095 if (queue_work(mdsc->fsc->cap_wq,
2096 &session->s_cap_release_work)) {
2097 dout("cap release work queued\n");
2098 } else {
2099 ceph_put_mds_session(session);
2100 dout("failed to queue cap release work\n");
2101 }
2102}
2103
2104/*
2105 * caller holds session->s_cap_lock
2106 */
2107void __ceph_queue_cap_release(struct ceph_mds_session *session,
2108 struct ceph_cap *cap)
2109{
2110 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2111 session->s_num_cap_releases++;
2112
2113 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2114 ceph_flush_cap_releases(session->s_mdsc, session);
2115}
2116
37c4efc1
YZ		 2117static void ceph_cap_reclaim_work(struct work_struct *work)
2118{
2119 struct ceph_mds_client *mdsc =
2120 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2121 int ret = ceph_trim_dentries(mdsc);
2122 if (ret == -EAGAIN)
2123 ceph_queue_cap_reclaim_work(mdsc);
2124}
2125
2126void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2127{
2128 if (mdsc->stopping)
2129 return;
2130
2131 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2132 dout("caps reclaim work queued\n");
2133 } else {
2134 dout("failed to queue caps release work\n");
2135 }
2136}
2137
fe33032d
YZ		 2138void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2139{
2140 int val;
2141 if (!nr)
2142 return;
2143 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
bba1560b 2144 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
fe33032d
YZ		 2145 atomic_set(&mdsc->cap_reclaim_pending, 0);
2146 ceph_queue_cap_reclaim_work(mdsc);
2147 }
2148}
2149
2f2dc053
SW		 2150/*
2151 * requests
2152 */
2153
54008399
YZ		 2154int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2155 struct inode *dir)
2156{
2157 struct ceph_inode_info *ci = ceph_inode(dir);
2158 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2159 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2160 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
ad8c28a9
JL		 2161 unsigned int num_entries;
2162 int order;
54008399
YZ		 2163
2164 spin_lock(&ci->i_ceph_lock);
2165 num_entries = ci->i_files + ci->i_subdirs;
2166 spin_unlock(&ci->i_ceph_lock);
ad8c28a9 2167 num_entries = max(num_entries, 1U);
54008399
YZ		 2168 num_entries = min(num_entries, opt->max_readdir);
2169
2170 order = get_order(size * num_entries);
2171 while (order >= 0) {
2a5beea3
YZ		 2172 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2173 __GFP_NOWARN,
2174 order);
2175 if (rinfo->dir_entries)
54008399
YZ		 2176 break;
2177 order--;
2178 }
2a5beea3 2179 if (!rinfo->dir_entries)
54008399
YZ		 2180 return -ENOMEM;
2181
2182 num_entries = (PAGE_SIZE << order) / size;
2183 num_entries = min(num_entries, opt->max_readdir);
2184
2185 rinfo->dir_buf_size = PAGE_SIZE << order;
2186 req->r_num_caps = num_entries + 1;
2187 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2188 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2189 return 0;
2190}
2191
2f2dc053
SW		 2192/*
2193 * Create an mds request.
2194 */
2195struct ceph_mds_request *
2196ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2197{
058daab7 2198 struct ceph_mds_request *req;
2f2dc053 2199
058daab7 2200 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2f2dc053
SW		 2201 if (!req)
2202 return ERR_PTR(-ENOMEM);
2203
b4556396 2204 mutex_init(&req->r_fill_mutex);
37151668 2205 req->r_mdsc = mdsc;
2f2dc053 2206 req->r_started = jiffies;
70c94820 2207 req->r_start_latency = ktime_get();
2f2dc053
SW		 2208 req->r_resend_mds = -1;
2209 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2210 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2211 req->r_fmode = -1;
153c8e6b 2212 kref_init(&req->r_kref);
fcd00b68 2213 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2214 INIT_LIST_HEAD(&req->r_wait);
2215 init_completion(&req->r_completion);
2216 init_completion(&req->r_safe_completion);
2217 INIT_LIST_HEAD(&req->r_unsafe_item);
2218
668c9a61 2219 ktime_get_coarse_real_ts64(&req->r_stamp);
b8e69066 2220
2f2dc053
SW		 2221 req->r_op = op;
2222 req->r_direct_mode = mode;
2223 return req;
2224}
2225
2226/*
44ca18f2 2227 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2228 *
2229 * called under mdsc->mutex.
2230 */
44ca18f2
SW		 2231static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2232{
2233 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2234 return NULL;
2235 return rb_entry(rb_first(&mdsc->request_tree),
2236 struct ceph_mds_request, r_node);
2237}
2238
e8a7b8b1 2239static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2240{
e8a7b8b1 2241 return mdsc->oldest_tid;
2f2dc053
SW		 2242}
2243
2244/*
2245 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2246 * on build_path_from_dentry in fs/cifs/dir.c.
2247 *
2248 * If @stop_on_nosnap, generate path relative to the first non-snapped
2249 * inode.
2250 *
2251 * Encode hidden .snap dirs as a double /, i.e.
2252 * foo/.snap/bar -> foo//bar
2253 */
69a10fb3 2254char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2f2dc053
SW		 2255 int stop_on_nosnap)
2256{
2257 struct dentry *temp;
2258 char *path;
f77f21bb 2259 int pos;
1b71fe2e 2260 unsigned seq;
69a10fb3 2261 u64 base;
2f2dc053 2262
d37b1d99 2263 if (!dentry)
2f2dc053
SW		 2264 return ERR_PTR(-EINVAL);
2265
f77f21bb 2266 path = __getname();
d37b1d99 2267 if (!path)
2f2dc053 2268 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2269retry:
2270 pos = PATH_MAX - 1;
2271 path[pos] = '\0';
2272
2273 seq = read_seqbegin(&rename_lock);
1b71fe2e 2274 rcu_read_lock();
f77f21bb
JL		 2275 temp = dentry;
2276 for (;;) {
1b71fe2e 2277 struct inode *inode;
2f2dc053 2278
1b71fe2e 2279 spin_lock(&temp->d_lock);
2b0143b5 2280 inode = d_inode(temp);
2f2dc053 2281 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
104648ad 2282 dout("build_path path+%d: %p SNAPDIR\n",
2f2dc053 2283 pos, temp);
d6b8bd67 2284 } else if (stop_on_nosnap && inode && dentry != temp &&
2f2dc053 2285 ceph_snap(inode) == CEPH_NOSNAP) {
9d5a09e6 2286 spin_unlock(&temp->d_lock);
d6b8bd67 2287 pos++; /* get rid of any prepended '/' */
2f2dc053
SW		 2288 break;
2289 } else {
2290 pos -= temp->d_name.len;
1b71fe2e
AV		 2291 if (pos < 0) {
2292 spin_unlock(&temp->d_lock);
2f2dc053 2293 break;
1b71fe2e 2294 }
f77f21bb 2295 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2f2dc053 2296 }
1b71fe2e 2297 spin_unlock(&temp->d_lock);
41883ba8 2298 temp = READ_ONCE(temp->d_parent);
f77f21bb
JL		 2299
2300 /* Are we at the root? */
2301 if (IS_ROOT(temp))
2302 break;
2303
2304 /* Are we out of buffer? */
2305 if (--pos < 0)
2306 break;
2307
2308 path[pos] = '/';
2f2dc053 2309 }
69a10fb3 2310 base = ceph_ino(d_inode(temp));
1b71fe2e 2311 rcu_read_unlock();
f5946bcc
JL		 2312
2313 if (read_seqretry(&rename_lock, seq))
2314 goto retry;
2315
2316 if (pos < 0) {
2317 /*
2318 * A rename didn't occur, but somehow we didn't end up where
2319 * we thought we would. Throw a warning and try again.
2320 */
2321 pr_warn("build_path did not end path lookup where "
2322 "expected, pos is %d\n", pos);
2f2dc053
SW		 2323 goto retry;
2324 }
2325
69a10fb3 2326 *pbase = base;
f77f21bb 2327 *plen = PATH_MAX - 1 - pos;
104648ad 2328 dout("build_path on %p %d built %llx '%.*s'\n",
f77f21bb
JL		 2329 dentry, d_count(dentry), base, *plen, path + pos);
2330 return path + pos;
2f2dc053
SW		 2331}
2332
fd36a717 2333static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2f2dc053 2334 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2335 bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2336{
2337 char *path;
2338
c6b0b656 2339 rcu_read_lock();
fd36a717
JL		 2340 if (!dir)
2341 dir = d_inode_rcu(dentry->d_parent);
964fff74 2342 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
c6b0b656
JL		 2343 *pino = ceph_ino(dir);
2344 rcu_read_unlock();
964fff74
JL		 2345 *ppath = dentry->d_name.name;
2346 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2347 return 0;
2348 }
c6b0b656 2349 rcu_read_unlock();
2f2dc053
SW		 2350 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2351 if (IS_ERR(path))
2352 return PTR_ERR(path);
2353 *ppath = path;
1bcb3440 2354 *pfreepath = true;
2f2dc053
SW		 2355 return 0;
2356}
2357
2358static int build_inode_path(struct inode *inode,
2359 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2360 bool *pfreepath)
2f2dc053
SW		 2361{
2362 struct dentry *dentry;
2363 char *path;
2364
2365 if (ceph_snap(inode) == CEPH_NOSNAP) {
2366 *pino = ceph_ino(inode);
2367 *ppathlen = 0;
2368 return 0;
2369 }
2370 dentry = d_find_alias(inode);
2371 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2372 dput(dentry);
2373 if (IS_ERR(path))
2374 return PTR_ERR(path);
2375 *ppath = path;
1bcb3440 2376 *pfreepath = true;
2f2dc053
SW		 2377 return 0;
2378}
2379
2380/*
2381 * request arguments may be specified via an inode *, a dentry *, or
2382 * an explicit ino+path.
2383 */
2384static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
fd36a717
JL		 2385 struct inode *rdiri, const char *rpath,
2386 u64 rino, const char **ppath, int *pathlen,
1bcb3440 2387 u64 *ino, bool *freepath, bool parent_locked)
2f2dc053
SW		 2388{
2389 int r = 0;
2390
2391 if (rinode) {
2392 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2393 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2394 ceph_snap(rinode));
2395 } else if (rdentry) {
fd36a717 2396 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2397 freepath, parent_locked);
2f2dc053
SW		 2398 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2399 *ppath);
795858db 2400 } else if (rpath || rino) {
2f2dc053
SW		 2401 *ino = rino;
2402 *ppath = rpath;
b000056a 2403 *pathlen = rpath ? strlen(rpath) : 0;
2f2dc053
SW		 2404 dout(" path %.*s\n", *pathlen, rpath);
2405 }
2406
2407 return r;
2408}
2409
2410/*
2411 * called under mdsc->mutex
2412 */
2413static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2414 struct ceph_mds_request *req,
6e6f0923 2415 int mds, bool drop_cap_releases)
2f2dc053
SW		 2416{
2417 struct ceph_msg *msg;
2418 struct ceph_mds_request_head *head;
2419 const char *path1 = NULL;
2420 const char *path2 = NULL;
2421 u64 ino1 = 0, ino2 = 0;
2422 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2423 bool freepath1 = false, freepath2 = false;
2f2dc053
SW		 2424 int len;
2425 u16 releases;
2426 void *p, *end;
2427 int ret;
2428
2429 ret = set_request_path_attr(req->r_inode, req->r_dentry,
3dd69aab 2430 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2431 &path1, &pathlen1, &ino1, &freepath1,
2432 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2433 &req->r_req_flags));
2f2dc053
SW		 2434 if (ret < 0) {
2435 msg = ERR_PTR(ret);
2436 goto out;
2437 }
2438
1bcb3440 2439 /* If r_old_dentry is set, then assume that its parent is locked */
2f2dc053 2440 ret = set_request_path_attr(NULL, req->r_old_dentry,
fd36a717 2441 req->r_old_dentry_dir,
2f2dc053 2442 req->r_path2, req->r_ino2.ino,
1bcb3440 2443 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 2444 if (ret < 0) {
2445 msg = ERR_PTR(ret);
2446 goto out_free1;
2447 }
2448
2449 len = sizeof(*head) +
b8e69066 2450 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
777d738a 2451 sizeof(struct ceph_timespec);
2f2dc053
SW		 2452
2453 /* calculate (max) length for cap releases */
2454 len += sizeof(struct ceph_mds_request_release) *
2455 (!!req->r_inode_drop + !!req->r_dentry_drop +
2456 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2457 if (req->r_dentry_drop)
c1dfc277 2458 len += pathlen1;
2f2dc053 2459 if (req->r_old_dentry_drop)
c1dfc277 2460 len += pathlen2;
2f2dc053 2461
0d9c1ab3 2462 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 2463 if (!msg) {
2464 msg = ERR_PTR(-ENOMEM);
2f2dc053 2465 goto out_free2;
a79832f2 2466 }
2f2dc053 2467
7cfa0313 2468 msg->hdr.version = cpu_to_le16(2);
6df058c0
SW		 2469 msg->hdr.tid = cpu_to_le64(req->r_tid);
2470
2f2dc053
SW		 2471 head = msg->front.iov_base;
2472 p = msg->front.iov_base + sizeof(*head);
2473 end = msg->front.iov_base + msg->front.iov_len;
2474
2475 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2476 head->op = cpu_to_le32(req->r_op);
ff3d0046
EB		 2477 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2478 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
6deb8008 2479 head->ino = cpu_to_le64(req->r_deleg_ino);
2f2dc053
SW		 2480 head->args = req->r_args;
2481
2482 ceph_encode_filepath(&p, end, ino1, path1);
2483 ceph_encode_filepath(&p, end, ino2, path2);
2484
e979cf50
SW		 2485 /* make note of release offset, in case we need to replay */
2486 req->r_request_release_offset = p - msg->front.iov_base;
2487
2f2dc053
SW		 2488 /* cap releases */
2489 releases = 0;
2490 if (req->r_inode_drop)
2491 releases += ceph_encode_inode_release(&p,
2b0143b5 2492 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
719a2514
YZ		 2493 mds, req->r_inode_drop, req->r_inode_unless,
2494 req->r_op == CEPH_MDS_OP_READDIR);
2f2dc053
SW		 2495 if (req->r_dentry_drop)
2496 releases += ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 2497 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 2498 req->r_dentry_unless);
2f2dc053
SW		 2499 if (req->r_old_dentry_drop)
2500 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 2501 req->r_old_dentry_dir, mds,
2502 req->r_old_dentry_drop,
2503 req->r_old_dentry_unless);
2f2dc053
SW		 2504 if (req->r_old_inode_drop)
2505 releases += ceph_encode_inode_release(&p,
2b0143b5 2506 d_inode(req->r_old_dentry),
2f2dc053 2507 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 2508
2509 if (drop_cap_releases) {
2510 releases = 0;
2511 p = msg->front.iov_base + req->r_request_release_offset;
2512 }
2513
2f2dc053
SW		 2514 head->num_releases = cpu_to_le16(releases);
2515
b8e69066 2516 /* time stamp */
1f041a89
YZ		 2517 {
2518 struct ceph_timespec ts;
0ed1e90a 2519 ceph_encode_timespec64(&ts, &req->r_stamp);
1f041a89
YZ		 2520 ceph_encode_copy(&p, &ts, sizeof(ts));
2521 }
b8e69066 2522
2f2dc053
SW		 2523 BUG_ON(p > end);
2524 msg->front.iov_len = p - msg->front.iov_base;
2525 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2526
25e6bae3
YZ		 2527 if (req->r_pagelist) {
2528 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 2529 ceph_msg_data_add_pagelist(msg, pagelist);
2530 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2531 } else {
2532 msg->hdr.data_len = 0;
ebf18f47 2533 }
02afca6c 2534
2f2dc053
SW		 2535 msg->hdr.data_off = cpu_to_le16(0);
2536
2537out_free2:
2538 if (freepath2)
f77f21bb 2539 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 2540out_free1:
2541 if (freepath1)
f77f21bb 2542 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 2543out:
2544 return msg;
2545}
2546
2547/*
2548 * called under mdsc->mutex if error, under no mutex if
2549 * success.
2550 */
2551static void complete_request(struct ceph_mds_client *mdsc,
2552 struct ceph_mds_request *req)
2553{
70c94820
XL		 2554 req->r_end_latency = ktime_get();
2555
2f2dc053
SW		 2556 if (req->r_callback)
2557 req->r_callback(mdsc, req);
111c7081 2558 complete_all(&req->r_completion);
2f2dc053
SW		 2559}
2560
2561/*
2562 * called under mdsc->mutex
2563 */
2564static int __prepare_send_request(struct ceph_mds_client *mdsc,
2565 struct ceph_mds_request *req,
6e6f0923 2566 int mds, bool drop_cap_releases)
2f2dc053
SW		 2567{
2568 struct ceph_mds_request_head *rhead;
2569 struct ceph_msg *msg;
2570 int flags = 0;
2571
2f2dc053 2572 req->r_attempts++;
e55b71f8
GF		 2573 if (req->r_inode) {
2574 struct ceph_cap *cap =
2575 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2576
2577 if (cap)
2578 req->r_sent_on_mseq = cap->mseq;
2579 else
2580 req->r_sent_on_mseq = -1;
2581 }
2f2dc053
SW		 2582 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2583 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2584
bc2de10d 2585 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 2586 void *p;
01a92f17
SW		 2587 /*
2588 * Replay. Do not regenerate message (and rebuild
2589 * paths, etc.); just use the original message.
2590 * Rebuilding paths will break for renames because
2591 * d_move mangles the src name.
2592 */
2593 msg = req->r_request;
2594 rhead = msg->front.iov_base;
2595
2596 flags = le32_to_cpu(rhead->flags);
2597 flags |= CEPH_MDS_FLAG_REPLAY;
2598 rhead->flags = cpu_to_le32(flags);
2599
2600 if (req->r_target_inode)
2601 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2602
2603 rhead->num_retry = req->r_attempts - 1;
e979cf50
SW		 2604
2605 /* remove cap/dentry releases from message */
2606 rhead->num_releases = 0;
c5c9a0bf
YZ		 2607
2608 /* time stamp */
2609 p = msg->front.iov_base + req->r_request_release_offset;
1f041a89
YZ		 2610 {
2611 struct ceph_timespec ts;
0ed1e90a 2612 ceph_encode_timespec64(&ts, &req->r_stamp);
1f041a89
YZ		 2613 ceph_encode_copy(&p, &ts, sizeof(ts));
2614 }
c5c9a0bf
YZ		 2615
2616 msg->front.iov_len = p - msg->front.iov_base;
2617 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 2618 return 0;
2619 }
2620
2f2dc053
SW		 2621 if (req->r_request) {
2622 ceph_msg_put(req->r_request);
2623 req->r_request = NULL;
2624 }
6e6f0923 2625 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2f2dc053 2626 if (IS_ERR(msg)) {
e1518c7c 2627 req->r_err = PTR_ERR(msg);
a79832f2 2628 return PTR_ERR(msg);
2f2dc053
SW		 2629 }
2630 req->r_request = msg;
2631
2632 rhead = msg->front.iov_base;
2f2dc053 2633 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 2634 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 2635 flags |= CEPH_MDS_FLAG_REPLAY;
3bb48b41
JL		 2636 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
2637 flags |= CEPH_MDS_FLAG_ASYNC;
3dd69aab 2638 if (req->r_parent)
2f2dc053
SW		 2639 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2640 rhead->flags = cpu_to_le32(flags);
2641 rhead->num_fwd = req->r_num_fwd;
2642 rhead->num_retry = req->r_attempts - 1;
2643
3dd69aab 2644 dout(" r_parent = %p\n", req->r_parent);
2f2dc053
SW		 2645 return 0;
2646}
2647
9cf54563
XL		 2648/*
2649 * called under mdsc->mutex
2650 */
2651static int __send_request(struct ceph_mds_client *mdsc,
2652 struct ceph_mds_session *session,
2653 struct ceph_mds_request *req,
2654 bool drop_cap_releases)
2655{
2656 int err;
2657
2658 err = __prepare_send_request(mdsc, req, session->s_mds,
2659 drop_cap_releases);
2660 if (!err) {
2661 ceph_msg_get(req->r_request);
2662 ceph_con_send(&session->s_con, req->r_request);
2663 }
2664
2665 return err;
2666}
2667
2f2dc053
SW		 2668/*
2669 * send request, or put it on the appropriate wait list.
2670 */
d5548492 2671static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 2672 struct ceph_mds_request *req)
2673{
2674 struct ceph_mds_session *session = NULL;
2675 int mds = -1;
48fec5d0 2676 int err = 0;
c4853e97 2677 bool random;
2f2dc053 2678
bc2de10d
JL		 2679 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2680 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 2681 __unregister_request(mdsc, req);
d5548492 2682 return;
eb1b8af3 2683 }
2f2dc053
SW		 2684
2685 if (req->r_timeout &&
2686 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2687 dout("do_request timed out\n");
8ccf7fcc 2688 err = -ETIMEDOUT;
2f2dc053
SW		 2689 goto finish;
2690 }
52953d55 2691 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
48fec5d0
YZ		 2692 dout("do_request forced umount\n");
2693 err = -EIO;
2694 goto finish;
2695 }
52953d55 2696 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 2697 if (mdsc->mdsmap_err) {
2698 err = mdsc->mdsmap_err;
2699 dout("do_request mdsmap err %d\n", err);
2700 goto finish;
2701 }
cc8e8342
YZ		 2702 if (mdsc->mdsmap->m_epoch == 0) {
2703 dout("do_request no mdsmap, waiting for map\n");
2704 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2705 return;
cc8e8342 2706 }
e9e427f0
YZ		 2707 if (!(mdsc->fsc->mount_options->flags &
2708 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2709 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
97820058 2710 err = -EHOSTUNREACH;
e9e427f0
YZ		 2711 goto finish;
2712 }
2713 }
2f2dc053 2714
dc69e2e9
SW		 2715 put_request_session(req);
2716
c4853e97 2717 mds = __choose_mds(mdsc, req, &random);
2f2dc053
SW		 2718 if (mds < 0 ||
2719 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3bb48b41
JL		 2720 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2721 err = -EJUKEBOX;
2722 goto finish;
2723 }
2f2dc053
SW		 2724 dout("do_request no mds or not active, waiting for map\n");
2725 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 2726 return;
2f2dc053
SW		 2727 }
2728
2729 /* get, open session */
2730 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 2731 if (!session) {
2f2dc053 2732 session = register_session(mdsc, mds);
9c423956
SW		 2733 if (IS_ERR(session)) {
2734 err = PTR_ERR(session);
2735 goto finish;
2736 }
2737 }
5b3248c6 2738 req->r_session = ceph_get_mds_session(session);
dc69e2e9 2739
2f2dc053 2740 dout("do_request mds%d session %p state %s\n", mds, session,
a687ecaf 2741 ceph_session_state_name(session->s_state));
2f2dc053
SW		 2742 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2743 session->s_state != CEPH_MDS_SESSION_HUNG) {
fcff415c
YZ		 2744 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2745 err = -EACCES;
2746 goto out_session;
2747 }
3bb48b41
JL		 2748 /*
2749 * We cannot queue async requests since the caps and delegated
2750 * inodes are bound to the session. Just return -EJUKEBOX and
2751 * let the caller retry a sync request in that case.
2752 */
2753 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
2754 err = -EJUKEBOX;
2755 goto out_session;
2756 }
2f2dc053 2757 if (session->s_state == CEPH_MDS_SESSION_NEW ||
c4853e97 2758 session->s_state == CEPH_MDS_SESSION_CLOSING) {
2f2dc053 2759 __open_session(mdsc, session);
c4853e97
XL		 2760 /* retry the same mds later */
2761 if (random)
2762 req->r_resend_mds = mds;
2763 }
2f2dc053
SW		 2764 list_add(&req->r_wait, &session->s_waiting);
2765 goto out_session;
2766 }
2767
2768 /* send request */
2f2dc053
SW		 2769 req->r_resend_mds = -1; /* forget any previous mds hint */
2770
2771 if (req->r_request_started == 0) /* note request start time */
2772 req->r_request_started = jiffies;
2773
9cf54563 2774 err = __send_request(mdsc, session, req, false);
2f2dc053
SW		 2775
2776out_session:
2777 ceph_put_mds_session(session);
48fec5d0
YZ		 2778finish:
2779 if (err) {
2780 dout("__do_request early error %d\n", err);
2781 req->r_err = err;
2782 complete_request(mdsc, req);
2783 __unregister_request(mdsc, req);
2784 }
d5548492 2785 return;
2f2dc053
SW		 2786}
2787
2788/*
2789 * called under mdsc->mutex
2790 */
2791static void __wake_requests(struct ceph_mds_client *mdsc,
2792 struct list_head *head)
2793{
ed75ec2c
YZ		 2794 struct ceph_mds_request *req;
2795 LIST_HEAD(tmp_list);
2796
2797 list_splice_init(head, &tmp_list);
2f2dc053 2798
ed75ec2c
YZ		 2799 while (!list_empty(&tmp_list)) {
2800 req = list_entry(tmp_list.next,
2801 struct ceph_mds_request, r_wait);
2f2dc053 2802 list_del_init(&req->r_wait);
7971bd92 2803 dout(" wake request %p tid %llu\n", req, req->r_tid);
2f2dc053
SW		 2804 __do_request(mdsc, req);
2805 }
2806}
2807
2808/*
2809 * Wake up threads with requests pending for @mds, so that they can
29790f26 2810 * resubmit their requests to a possibly different mds.
2f2dc053 2811 */
29790f26 2812static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 2813{
44ca18f2 2814 struct ceph_mds_request *req;
282c1052 2815 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053
SW		 2816
2817 dout("kick_requests mds%d\n", mds);
282c1052 2818 while (p) {
44ca18f2 2819 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 2820 p = rb_next(p);
bc2de10d 2821 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 2822 continue;
3de22be6
YZ		 2823 if (req->r_attempts > 0)
2824 continue; /* only new requests */
44ca18f2
SW		 2825 if (req->r_session &&
2826 req->r_session->s_mds == mds) {
2827 dout(" kicking tid %llu\n", req->r_tid);
03974e81 2828 list_del_init(&req->r_wait);
44ca18f2 2829 __do_request(mdsc, req);
2f2dc053
SW		 2830 }
2831 }
2832}
2833
86bda539 2834int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 2835 struct ceph_mds_request *req)
2836{
891f3f5a 2837 int err = 0;
86bda539
JL		 2838
2839 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2840 if (req->r_inode)
2841 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
9c1c2b35 2842 if (req->r_parent) {
719a2514
YZ		 2843 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
2844 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
2845 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
2846 spin_lock(&ci->i_ceph_lock);
2847 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
2848 __ceph_touch_fmode(ci, mdsc, fmode);
2849 spin_unlock(&ci->i_ceph_lock);
9c1c2b35
JL		 2850 ihold(req->r_parent);
2851 }
86bda539
JL		 2852 if (req->r_old_dentry_dir)
2853 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2854 CEPH_CAP_PIN);
2855
891f3f5a
JL		 2856 if (req->r_inode) {
2857 err = ceph_wait_on_async_create(req->r_inode);
2858 if (err) {
2859 dout("%s: wait for async create returned: %d\n",
2860 __func__, err);
2861 return err;
2862 }
2863 }
2864
2865 if (!err && req->r_old_inode) {
2866 err = ceph_wait_on_async_create(req->r_old_inode);
2867 if (err) {
2868 dout("%s: wait for async create returned: %d\n",
2869 __func__, err);
2870 return err;
2871 }
2872 }
2873
86bda539 2874 dout("submit_request on %p for inode %p\n", req, dir);
2f2dc053 2875 mutex_lock(&mdsc->mutex);
86bda539 2876 __register_request(mdsc, req, dir);
2f2dc053 2877 __do_request(mdsc, req);
86bda539 2878 err = req->r_err;
2f2dc053 2879 mutex_unlock(&mdsc->mutex);
86bda539 2880 return err;
2f2dc053
SW		 2881}
2882
8340f22c
JL		 2883static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2884 struct ceph_mds_request *req)
2f2dc053
SW		 2885{
2886 int err;
2887
e1518c7c 2888 /* wait */
e1518c7c 2889 dout("do_request waiting\n");
5be73034 2890 if (!req->r_timeout && req->r_wait_for_completion) {
9280be24 2891 err = req->r_wait_for_completion(mdsc, req);
e1518c7c 2892 } else {
5be73034
ID		 2893 long timeleft = wait_for_completion_killable_timeout(
2894 &req->r_completion,
2895 ceph_timeout_jiffies(req->r_timeout));
2896 if (timeleft > 0)
2897 err = 0;
2898 else if (!timeleft)
8ccf7fcc 2899 err = -ETIMEDOUT; /* timed out */
5be73034
ID		 2900 else
2901 err = timeleft; /* killed */
e1518c7c
SW		 2902 }
2903 dout("do_request waited, got %d\n", err);
2904 mutex_lock(&mdsc->mutex);
5b1daecd 2905
e1518c7c 2906 /* only abort if we didn't race with a real reply */
bc2de10d 2907 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 2908 err = le32_to_cpu(req->r_reply_info.head->result);
2909 } else if (err < 0) {
2910 dout("aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 2911
2912 /*
2913 * ensure we aren't running concurrently with
2914 * ceph_fill_trace or ceph_readdir_prepopulate, which
2915 * rely on locks (dir mutex) held by our caller.
2916 */
2917 mutex_lock(&req->r_fill_mutex);
e1518c7c 2918 req->r_err = err;
bc2de10d 2919 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 2920 mutex_unlock(&req->r_fill_mutex);
5b1daecd 2921
3dd69aab 2922 if (req->r_parent &&
167c9e35
SW		 2923 (req->r_op & CEPH_MDS_OP_WRITE))
2924 ceph_invalidate_dir_request(req);
2f2dc053 2925 } else {
e1518c7c 2926 err = req->r_err;
2f2dc053 2927 }
2f2dc053 2928
e1518c7c 2929 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 2930 return err;
2931}
2932
2933/*
2934 * Synchrously perform an mds request. Take care of all of the
2935 * session setup, forwarding, retry details.
2936 */
2937int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2938 struct inode *dir,
2939 struct ceph_mds_request *req)
2940{
2941 int err;
2942
2943 dout("do_request on %p\n", req);
2944
2945 /* issue */
2946 err = ceph_mdsc_submit_request(mdsc, dir, req);
2947 if (!err)
2948 err = ceph_mdsc_wait_request(mdsc, req);
2f2dc053
SW		 2949 dout("do_request %p done, result %d\n", req, err);
2950 return err;
2951}
2952
167c9e35 2953/*
2f276c51 2954 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 2955 * namespace request.
2956 */
2957void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2958{
8d8f371c
YZ		 2959 struct inode *dir = req->r_parent;
2960 struct inode *old_dir = req->r_old_dentry_dir;
167c9e35 2961
8d8f371c 2962 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
167c9e35 2963
8d8f371c
YZ		 2964 ceph_dir_clear_complete(dir);
2965 if (old_dir)
2966 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 2967 if (req->r_dentry)
2968 ceph_invalidate_dentry_lease(req->r_dentry);
2969 if (req->r_old_dentry)
2970 ceph_invalidate_dentry_lease(req->r_old_dentry);
2971}
2972
2f2dc053
SW		 2973/*
2974 * Handle mds reply.
2975 *
2976 * We take the session mutex and parse and process the reply immediately.
2977 * This preserves the logical ordering of replies, capabilities, etc., sent
2978 * by the MDS as they are applied to our local cache.
2979 */
2980static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2981{
2982 struct ceph_mds_client *mdsc = session->s_mdsc;
2983 struct ceph_mds_request *req;
2984 struct ceph_mds_reply_head *head = msg->front.iov_base;
2985 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 2986 struct ceph_snap_realm *realm;
2f2dc053
SW		 2987 u64 tid;
2988 int err, result;
2600d2dd 2989 int mds = session->s_mds;
2f2dc053 2990
2f2dc053
SW		 2991 if (msg->front.iov_len < sizeof(*head)) {
2992 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
9ec7cab1 2993 ceph_msg_dump(msg);
2f2dc053
SW		 2994 return;
2995 }
2996
2997 /* get request, session */
6df058c0 2998 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 2999 mutex_lock(&mdsc->mutex);
fcd00b68 3000 req = lookup_get_request(mdsc, tid);
2f2dc053
SW		 3001 if (!req) {
3002 dout("handle_reply on unknown tid %llu\n", tid);
3003 mutex_unlock(&mdsc->mutex);
3004 return;
3005 }
3006 dout("handle_reply %p\n", req);
2f2dc053
SW		 3007
3008 /* correct session? */
d96d6049 3009 if (req->r_session != session) {
2f2dc053
SW		 3010 pr_err("mdsc_handle_reply got %llu on session mds%d"
3011 " not mds%d\n", tid, session->s_mds,
3012 req->r_session ? req->r_session->s_mds : -1);
3013 mutex_unlock(&mdsc->mutex);
3014 goto out;
3015 }
3016
3017 /* dup? */
bc2de10d
JL		 3018 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3019 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
f3ae1b97 3020 pr_warn("got a dup %s reply on %llu from mds%d\n",
2f2dc053
SW		 3021 head->safe ? "safe" : "unsafe", tid, mds);
3022 mutex_unlock(&mdsc->mutex);
3023 goto out;
3024 }
bc2de10d 3025 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
f3ae1b97 3026 pr_warn("got unsafe after safe on %llu from mds%d\n",
85792d0d
SW		 3027 tid, mds);
3028 mutex_unlock(&mdsc->mutex);
3029 goto out;
3030 }
2f2dc053
SW		 3031
3032 result = le32_to_cpu(head->result);
3033
3034 /*
e55b71f8
GF		 3035 * Handle an ESTALE
3036 * if we're not talking to the authority, send to them
3037 * if the authority has changed while we weren't looking,
3038 * send to new authority
3039 * Otherwise we just have to return an ESTALE
2f2dc053
SW		 3040 */
3041 if (result == -ESTALE) {
4c069a58 3042 dout("got ESTALE on request %llu\n", req->r_tid);
51da8e8c 3043 req->r_resend_mds = -1;
ca18bede 3044 if (req->r_direct_mode != USE_AUTH_MDS) {
4c069a58 3045 dout("not using auth, setting for that now\n");
e55b71f8 3046 req->r_direct_mode = USE_AUTH_MDS;
2f2dc053
SW		 3047 __do_request(mdsc, req);
3048 mutex_unlock(&mdsc->mutex);
3049 goto out;
e55b71f8 3050 } else {
c4853e97 3051 int mds = __choose_mds(mdsc, req, NULL);
ca18bede 3052 if (mds >= 0 && mds != req->r_session->s_mds) {
4c069a58 3053 dout("but auth changed, so resending\n");
e55b71f8
GF		 3054 __do_request(mdsc, req);
3055 mutex_unlock(&mdsc->mutex);
3056 goto out;
3057 }
2f2dc053 3058 }
4c069a58 3059 dout("have to return ESTALE on request %llu\n", req->r_tid);
2f2dc053
SW		 3060 }
3061
e55b71f8 3062
2f2dc053 3063 if (head->safe) {
bc2de10d 3064 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 3065 __unregister_request(mdsc, req);
2f2dc053 3066
07edc057
XL		 3067 /* last request during umount? */
3068 if (mdsc->stopping && !__get_oldest_req(mdsc))
3069 complete_all(&mdsc->safe_umount_waiters);
3070
bc2de10d 3071 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 3072 /*
3073 * We already handled the unsafe response, now do the
3074 * cleanup. No need to examine the response; the MDS
3075 * doesn't include any result info in the safe
3076 * response. And even if it did, there is nothing
3077 * useful we could do with a revised return value.
3078 */
3079 dout("got safe reply %llu, mds%d\n", tid, mds);
2f2dc053 3080
2f2dc053
SW		 3081 mutex_unlock(&mdsc->mutex);
3082 goto out;
3083 }
e1518c7c 3084 } else {
bc2de10d 3085 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053
SW		 3086 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3087 }
3088
3089 dout("handle_reply tid %lld result %d\n", tid, result);
3090 rinfo = &req->r_reply_info;
b37fe1f9 3091 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
d4846487 3092 err = parse_reply_info(session, msg, rinfo, (u64)-1);
b37fe1f9 3093 else
d4846487 3094 err = parse_reply_info(session, msg, rinfo, session->s_con.peer_features);
2f2dc053
SW		 3095 mutex_unlock(&mdsc->mutex);
3096
3097 mutex_lock(&session->s_mutex);
3098 if (err < 0) {
25933abd 3099 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
9ec7cab1 3100 ceph_msg_dump(msg);
2f2dc053
SW		 3101 goto out_err;
3102 }
3103
3104 /* snap trace */
982d6011 3105 realm = NULL;
2f2dc053
SW		 3106 if (rinfo->snapblob_len) {
3107 down_write(&mdsc->snap_rwsem);
3108 ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 3109 rinfo->snapblob + rinfo->snapblob_len,
3110 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3111 &realm);
2f2dc053
SW		 3112 downgrade_write(&mdsc->snap_rwsem);
3113 } else {
3114 down_read(&mdsc->snap_rwsem);
3115 }
3116
3117 /* insert trace into our cache */
b4556396 3118 mutex_lock(&req->r_fill_mutex);
315f2408 3119 current->journal_info = req;
f5a03b08 3120 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 3121 if (err == 0) {
6e8575fa 3122 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 3123 req->r_op == CEPH_MDS_OP_LSSNAP))
2f2dc053 3124 ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 3125 }
315f2408 3126 current->journal_info = NULL;
b4556396 3127 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 3128
3129 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 3130 if (realm)
3131 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 3132
fe33032d
YZ		 3133 if (err == 0) {
3134 if (req->r_target_inode &&
3135 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3136 struct ceph_inode_info *ci =
3137 ceph_inode(req->r_target_inode);
3138 spin_lock(&ci->i_unsafe_lock);
3139 list_add_tail(&req->r_unsafe_target_item,
3140 &ci->i_unsafe_iops);
3141 spin_unlock(&ci->i_unsafe_lock);
3142 }
3143
3144 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 3145 }
2f2dc053 3146out_err:
e1518c7c 3147 mutex_lock(&mdsc->mutex);
bc2de10d 3148 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 3149 if (err) {
3150 req->r_err = err;
3151 } else {
5fdb1389 3152 req->r_reply = ceph_msg_get(msg);
bc2de10d 3153 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 3154 }
2f2dc053 3155 } else {
e1518c7c 3156 dout("reply arrived after request %lld was aborted\n", tid);
2f2dc053 3157 }
e1518c7c 3158 mutex_unlock(&mdsc->mutex);
2f2dc053 3159
2f2dc053
SW		 3160 mutex_unlock(&session->s_mutex);
3161
3162 /* kick calling process */
3163 complete_request(mdsc, req);
70c94820
XL		 3164
3165 ceph_update_metadata_latency(&mdsc->metric, req->r_start_latency,
3166 req->r_end_latency, err);
2f2dc053
SW		 3167out:
3168 ceph_mdsc_put_request(req);
3169 return;
3170}
3171
3172
3173
3174/*
3175 * handle mds notification that our request has been forwarded.
3176 */
2600d2dd
SW		 3177static void handle_forward(struct ceph_mds_client *mdsc,
3178 struct ceph_mds_session *session,
3179 struct ceph_msg *msg)
2f2dc053
SW		 3180{
3181 struct ceph_mds_request *req;
a1ea787c 3182 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 3183 u32 next_mds;
3184 u32 fwd_seq;
2f2dc053
SW		 3185 int err = -EINVAL;
3186 void *p = msg->front.iov_base;
3187 void *end = p + msg->front.iov_len;
2f2dc053 3188
a1ea787c 3189 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 3190 next_mds = ceph_decode_32(&p);
3191 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 3192
3193 mutex_lock(&mdsc->mutex);
fcd00b68 3194 req = lookup_get_request(mdsc, tid);
2f2dc053 3195 if (!req) {
2a8e5e36 3196 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2f2dc053
SW		 3197 goto out; /* dup reply? */
3198 }
3199
bc2de10d 3200 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2a8e5e36
SW		 3201 dout("forward tid %llu aborted, unregistering\n", tid);
3202 __unregister_request(mdsc, req);
3203 } else if (fwd_seq <= req->r_num_fwd) {
3204 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2f2dc053
SW		 3205 tid, next_mds, req->r_num_fwd, fwd_seq);
3206 } else {
3207 /* resend. forward race not possible; mds would drop */
2a8e5e36
SW		 3208 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3209 BUG_ON(req->r_err);
bc2de10d 3210 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 3211 req->r_attempts = 0;
2f2dc053
SW		 3212 req->r_num_fwd = fwd_seq;
3213 req->r_resend_mds = next_mds;
3214 put_request_session(req);
3215 __do_request(mdsc, req);
3216 }
3217 ceph_mdsc_put_request(req);
3218out:
3219 mutex_unlock(&mdsc->mutex);
3220 return;
3221
3222bad:
3223 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3224}
3225
131d7eb4
YZ		 3226static int __decode_session_metadata(void **p, void *end,
3227 bool *blacklisted)
84bf3950
YZ		 3228{
3229 /* map<string,string> */
3230 u32 n;
131d7eb4 3231 bool err_str;
84bf3950
YZ		 3232 ceph_decode_32_safe(p, end, n, bad);
3233 while (n-- > 0) {
3234 u32 len;
3235 ceph_decode_32_safe(p, end, len, bad);
3236 ceph_decode_need(p, end, len, bad);
131d7eb4 3237 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 3238 *p += len;
3239 ceph_decode_32_safe(p, end, len, bad);
3240 ceph_decode_need(p, end, len, bad);
131d7eb4
YZ		 3241 if (err_str && strnstr(*p, "blacklisted", len))
3242 *blacklisted = true;
84bf3950
YZ		 3243 *p += len;
3244 }
3245 return 0;
3246bad:
3247 return -1;
3248}
3249
2f2dc053
SW		 3250/*
3251 * handle a mds session control message
3252 */
3253static void handle_session(struct ceph_mds_session *session,
3254 struct ceph_msg *msg)
3255{
3256 struct ceph_mds_client *mdsc = session->s_mdsc;
84bf3950
YZ		 3257 int mds = session->s_mds;
3258 int msg_version = le16_to_cpu(msg->hdr.version);
3259 void *p = msg->front.iov_base;
3260 void *end = p + msg->front.iov_len;
3261 struct ceph_mds_session_head *h;
2f2dc053 3262 u32 op;
0fa82633 3263 u64 seq, features = 0;
2f2dc053 3264 int wake = 0;
131d7eb4 3265 bool blacklisted = false;
2f2dc053 3266
2f2dc053 3267 /* decode */
84bf3950
YZ		 3268 ceph_decode_need(&p, end, sizeof(*h), bad);
3269 h = p;
3270 p += sizeof(*h);
3271
2f2dc053
SW		 3272 op = le32_to_cpu(h->op);
3273 seq = le64_to_cpu(h->seq);
3274
84bf3950
YZ		 3275 if (msg_version >= 3) {
3276 u32 len;
3277 /* version >= 2, metadata */
131d7eb4 3278 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
84bf3950
YZ		 3279 goto bad;
3280 /* version >= 3, feature bits */
3281 ceph_decode_32_safe(&p, end, len, bad);
0fa82633
JL		 3282 ceph_decode_64_safe(&p, end, features, bad);
3283 p += len - sizeof(features);
84bf3950
YZ		 3284 }
3285
2f2dc053 3286 mutex_lock(&mdsc->mutex);
0a07fc8c 3287 if (op == CEPH_SESSION_CLOSE) {
5b3248c6 3288 ceph_get_mds_session(session);
2600d2dd 3289 __unregister_session(mdsc, session);
0a07fc8c 3290 }
2f2dc053
SW		 3291 /* FIXME: this ttl calculation is generous */
3292 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3293 mutex_unlock(&mdsc->mutex);
3294
3295 mutex_lock(&session->s_mutex);
3296
3297 dout("handle_session mds%d %s %p state %s seq %llu\n",
3298 mds, ceph_session_op_name(op), session,
a687ecaf 3299 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 3300
3301 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3302 session->s_state = CEPH_MDS_SESSION_OPEN;
3303 pr_info("mds%d came back\n", session->s_mds);
3304 }
3305
3306 switch (op) {
3307 case CEPH_SESSION_OPEN:
29790f26
SW		 3308 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3309 pr_info("mds%d reconnect success\n", session->s_mds);
2f2dc053 3310 session->s_state = CEPH_MDS_SESSION_OPEN;
84bf3950 3311 session->s_features = features;
2f2dc053
SW		 3312 renewed_caps(mdsc, session, 0);
3313 wake = 1;
3314 if (mdsc->stopping)
3315 __close_session(mdsc, session);
3316 break;
3317
3318 case CEPH_SESSION_RENEWCAPS:
3319 if (session->s_renew_seq == seq)
3320 renewed_caps(mdsc, session, 1);
3321 break;
3322
3323 case CEPH_SESSION_CLOSE:
29790f26
SW		 3324 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3325 pr_info("mds%d reconnect denied\n", session->s_mds);
4d681c2f 3326 session->s_state = CEPH_MDS_SESSION_CLOSED;
1c841a96 3327 cleanup_session_requests(mdsc, session);
2f2dc053 3328 remove_session_caps(session);
656e4382 3329 wake = 2; /* for good measure */
f3c60c59 3330 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 3331 break;
3332
3333 case CEPH_SESSION_STALE:
3334 pr_info("mds%d caps went stale, renewing\n",
3335 session->s_mds);
d8fb02ab 3336 spin_lock(&session->s_gen_ttl_lock);
2f2dc053 3337 session->s_cap_gen++;
1ce208a6 3338 session->s_cap_ttl = jiffies - 1;
d8fb02ab 3339 spin_unlock(&session->s_gen_ttl_lock);
2f2dc053
SW		 3340 send_renew_caps(mdsc, session);
3341 break;
3342
3343 case CEPH_SESSION_RECALL_STATE:
e30ee581 3344 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 3345 break;
3346
186e4f7a
YZ		 3347 case CEPH_SESSION_FLUSHMSG:
3348 send_flushmsg_ack(mdsc, session, seq);
3349 break;
3350
03f4fcb0
YZ		 3351 case CEPH_SESSION_FORCE_RO:
3352 dout("force_session_readonly %p\n", session);
3353 spin_lock(&session->s_cap_lock);
3354 session->s_readonly = true;
3355 spin_unlock(&session->s_cap_lock);
d2f8bb27 3356 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 3357 break;
3358
fcff415c
YZ		 3359 case CEPH_SESSION_REJECT:
3360 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3361 pr_info("mds%d rejected session\n", session->s_mds);
3362 session->s_state = CEPH_MDS_SESSION_REJECTED;
3363 cleanup_session_requests(mdsc, session);
3364 remove_session_caps(session);
131d7eb4
YZ		 3365 if (blacklisted)
3366 mdsc->fsc->blacklisted = true;
fcff415c
YZ		 3367 wake = 2; /* for good measure */
3368 break;
3369
2f2dc053
SW		 3370 default:
3371 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3372 WARN_ON(1);
3373 }
3374
3375 mutex_unlock(&session->s_mutex);
3376 if (wake) {
3377 mutex_lock(&mdsc->mutex);
3378 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 3379 if (wake == 2)
3380 kick_requests(mdsc, mds);
2f2dc053
SW		 3381 mutex_unlock(&mdsc->mutex);
3382 }
0a07fc8c
YZ		 3383 if (op == CEPH_SESSION_CLOSE)
3384 ceph_put_mds_session(session);
2f2dc053
SW		 3385 return;
3386
3387bad:
3388 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3389 (int)msg->front.iov_len);
9ec7cab1 3390 ceph_msg_dump(msg);
2f2dc053
SW		 3391 return;
3392}
3393
a25949b9
JL		 3394void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
3395{
3396 int dcaps;
3397
3398 dcaps = xchg(&req->r_dir_caps, 0);
3399 if (dcaps) {
3400 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3401 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
3402 }
3403}
3404
e64f44a8
XL		 3405void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
3406{
3407 int dcaps;
3408
3409 dcaps = xchg(&req->r_dir_caps, 0);
3410 if (dcaps) {
3411 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
3412 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
3413 dcaps);
3414 }
3415}
3416
2f2dc053
SW		 3417/*
3418 * called under session->mutex.
3419 */
3420static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3421 struct ceph_mds_session *session)
3422{
3423 struct ceph_mds_request *req, *nreq;
3de22be6 3424 struct rb_node *p;
2f2dc053
SW		 3425
3426 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3427
3428 mutex_lock(&mdsc->mutex);
9cf54563
XL		 3429 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
3430 __send_request(mdsc, session, req, true);
3de22be6
YZ		 3431
3432 /*
3433 * also re-send old requests when MDS enters reconnect stage. So that MDS
3434 * can process completed request in clientreplay stage.
3435 */
3436 p = rb_first(&mdsc->request_tree);
3437 while (p) {
3438 req = rb_entry(p, struct ceph_mds_request, r_node);
3439 p = rb_next(p);
bc2de10d 3440 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 3441 continue;
3442 if (req->r_attempts == 0)
3443 continue; /* only old requests */
a25949b9
JL		 3444 if (!req->r_session)
3445 continue;
3446 if (req->r_session->s_mds != session->s_mds)
3447 continue;
3448
e64f44a8 3449 ceph_mdsc_release_dir_caps_no_check(req);
a25949b9
JL		 3450
3451 __send_request(mdsc, session, req, true);
3de22be6 3452 }
2f2dc053
SW		 3453 mutex_unlock(&mdsc->mutex);
3454}
3455
81c5a148
YZ		 3456static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3457{
3458 struct ceph_msg *reply;
3459 struct ceph_pagelist *_pagelist;
3460 struct page *page;
3461 __le32 *addr;
3462 int err = -ENOMEM;
3463
3464 if (!recon_state->allow_multi)
3465 return -ENOSPC;
3466
3467 /* can't handle message that contains both caps and realm */
3468 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3469
3470 /* pre-allocate new pagelist */
3471 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3472 if (!_pagelist)
3473 return -ENOMEM;
3474
3475 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3476 if (!reply)
3477 goto fail_msg;
3478
3479 /* placeholder for nr_caps */
3480 err = ceph_pagelist_encode_32(_pagelist, 0);
3481 if (err < 0)
3482 goto fail;
3483
3484 if (recon_state->nr_caps) {
3485 /* currently encoding caps */
3486 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3487 if (err)
3488 goto fail;
3489 } else {
3490 /* placeholder for nr_realms (currently encoding relams) */
3491 err = ceph_pagelist_encode_32(_pagelist, 0);
3492 if (err < 0)
3493 goto fail;
3494 }
3495
3496 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3497 if (err)
3498 goto fail;
3499
3500 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3501 addr = kmap_atomic(page);
3502 if (recon_state->nr_caps) {
3503 /* currently encoding caps */
3504 *addr = cpu_to_le32(recon_state->nr_caps);
3505 } else {
3506 /* currently encoding relams */
3507 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3508 }
3509 kunmap_atomic(addr);
3510
3511 reply->hdr.version = cpu_to_le16(5);
3512 reply->hdr.compat_version = cpu_to_le16(4);
3513
3514 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3515 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3516
3517 ceph_con_send(&recon_state->session->s_con, reply);
3518 ceph_pagelist_release(recon_state->pagelist);
3519
3520 recon_state->pagelist = _pagelist;
3521 recon_state->nr_caps = 0;
3522 recon_state->nr_realms = 0;
3523 recon_state->msg_version = 5;
3524 return 0;
3525fail:
3526 ceph_msg_put(reply);
3527fail_msg:
3528 ceph_pagelist_release(_pagelist);
3529 return err;
3530}
3531
2f2dc053
SW		 3532/*
3533 * Encode information about a cap for a reconnect with the MDS.
3534 */
a25949b9 3535static int reconnect_caps_cb(struct inode *inode, struct ceph_cap *cap,
2f2dc053
SW		 3536 void *arg)
3537{
20cb34ae
SW		 3538 union {
3539 struct ceph_mds_cap_reconnect v2;
3540 struct ceph_mds_cap_reconnect_v1 v1;
3541 } rec;
b3f8d68f 3542 struct ceph_inode_info *ci = cap->ci;
20cb34ae
SW		 3543 struct ceph_reconnect_state *recon_state = arg;
3544 struct ceph_pagelist *pagelist = recon_state->pagelist;
5ccedf1c 3545 int err;
3469ed0d 3546 u64 snap_follows;
2f2dc053 3547
2f2dc053
SW		 3548 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3549 inode, ceph_vinop(inode), cap, cap->cap_id,
3550 ceph_cap_string(cap->issued));
2f2dc053 3551
be655596 3552 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 3553 cap->seq = 0; /* reset cap seq */
3554 cap->issue_seq = 0; /* and issue_seq */
667ca05c 3555 cap->mseq = 0; /* and migrate_seq */
99a9c273 3556 cap->cap_gen = cap->session->s_cap_gen;
20cb34ae 3557
a25949b9 3558 /* These are lost when the session goes away */
785892fe
JL		 3559 if (S_ISDIR(inode->i_mode)) {
3560 if (cap->issued & CEPH_CAP_DIR_CREATE) {
3561 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
3562 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
3563 }
a25949b9 3564 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
785892fe 3565 }
a25949b9 3566
121f22a1 3567 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 3568 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3569 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3570 rec.v2.issued = cpu_to_le32(cap->issued);
3571 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
5ccedf1c 3572 rec.v2.pathbase = 0;
ec1dff25
JL		 3573 rec.v2.flock_len = (__force __le32)
3574 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae
SW		 3575 } else {
3576 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3577 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3578 rec.v1.issued = cpu_to_le32(cap->issued);
3579 rec.v1.size = cpu_to_le64(inode->i_size);
9bbeab41
AB		 3580 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3581 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
20cb34ae 3582 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
5ccedf1c 3583 rec.v1.pathbase = 0;
20cb34ae 3584 }
3469ed0d
YZ		 3585
3586 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 3587 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 3588 } else {
3589 struct ceph_cap_snap *capsnap =
3590 list_first_entry(&ci->i_cap_snaps,
3591 struct ceph_cap_snap, ci_item);
3592 snap_follows = capsnap->follows;
20cb34ae 3593 }
be655596 3594 spin_unlock(&ci->i_ceph_lock);
2f2dc053 3595
121f22a1 3596 if (recon_state->msg_version >= 2) {
40819f6f 3597 int num_fcntl_locks, num_flock_locks;
4deb14a2 3598 struct ceph_filelock *flocks = NULL;
81c5a148 3599 size_t struct_len, total_len = sizeof(u64);
121f22a1 3600 u8 struct_v = 0;
39be95e9
JS		 3601
3602encode_again:
b3f8d68f
YZ		 3603 if (rec.v2.flock_len) {
3604 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3605 } else {
3606 num_fcntl_locks = 0;
3607 num_flock_locks = 0;
3608 }
4deb14a2 3609 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 3610 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3611 sizeof(struct ceph_filelock),
3612 GFP_NOFS);
4deb14a2
YZ		 3613 if (!flocks) {
3614 err = -ENOMEM;
5ccedf1c 3615 goto out_err;
4deb14a2
YZ		 3616 }
3617 err = ceph_encode_locks_to_buffer(inode, flocks,
3618 num_fcntl_locks,
3619 num_flock_locks);
3620 if (err) {
3621 kfree(flocks);
3622 flocks = NULL;
3623 if (err == -ENOSPC)
3624 goto encode_again;
5ccedf1c 3625 goto out_err;
4deb14a2
YZ		 3626 }
3627 } else {
39be95e9 3628 kfree(flocks);
4deb14a2 3629 flocks = NULL;
39be95e9 3630 }
121f22a1
YZ		 3631
3632 if (recon_state->msg_version >= 3) {
3633 /* version, compat_version and struct_len */
81c5a148 3634 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 3635 struct_v = 2;
121f22a1 3636 }
39be95e9
JS		 3637 /*
3638 * number of encoded locks is stable, so copy to pagelist
3639 */
121f22a1
YZ		 3640 struct_len = 2 * sizeof(u32) +
3641 (num_fcntl_locks + num_flock_locks) *
3642 sizeof(struct ceph_filelock);
3643 rec.v2.flock_len = cpu_to_le32(struct_len);
3644
5ccedf1c 3645 struct_len += sizeof(u32) + sizeof(rec.v2);
121f22a1 3646
3469ed0d
YZ		 3647 if (struct_v >= 2)
3648 struct_len += sizeof(u64); /* snap_follows */
3649
121f22a1 3650 total_len += struct_len;
81c5a148
YZ		 3651
3652 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3653 err = send_reconnect_partial(recon_state);
3654 if (err)
3655 goto out_freeflocks;
3656 pagelist = recon_state->pagelist;
5ccedf1c 3657 }
121f22a1 3658
81c5a148
YZ		 3659 err = ceph_pagelist_reserve(pagelist, total_len);
3660 if (err)
3661 goto out_freeflocks;
3662
3663 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3664 if (recon_state->msg_version >= 3) {
3665 ceph_pagelist_encode_8(pagelist, struct_v);
3666 ceph_pagelist_encode_8(pagelist, 1);
3667 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 3668 }
5ccedf1c
YZ		 3669 ceph_pagelist_encode_string(pagelist, NULL, 0);
3670 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3671 ceph_locks_to_pagelist(flocks, pagelist,
3672 num_fcntl_locks, num_flock_locks);
3673 if (struct_v >= 2)
3674 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 3675out_freeflocks:
39be95e9 3676 kfree(flocks);
3612abbd 3677 } else {
5ccedf1c
YZ		 3678 u64 pathbase = 0;
3679 int pathlen = 0;
3680 char *path = NULL;
3681 struct dentry *dentry;
3682
3683 dentry = d_find_alias(inode);
3684 if (dentry) {
3685 path = ceph_mdsc_build_path(dentry,
3686 &pathlen, &pathbase, 0);
3687 dput(dentry);
3688 if (IS_ERR(path)) {
3689 err = PTR_ERR(path);
3690 goto out_err;
3691 }
3692 rec.v1.pathbase = cpu_to_le64(pathbase);
121f22a1 3693 }
5ccedf1c
YZ		 3694
3695 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 3696 sizeof(u64) + sizeof(u32) +
3697 pathlen + sizeof(rec.v1));
5ccedf1c 3698 if (err) {
81c5a148 3699 goto out_freepath;
5ccedf1c
YZ		 3700 }
3701
81c5a148 3702 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 3703 ceph_pagelist_encode_string(pagelist, path, pathlen);
3704 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
81c5a148 3705out_freepath:
f77f21bb 3706 ceph_mdsc_free_path(path, pathlen);
40819f6f 3707 }
44c99757 3708
5ccedf1c 3709out_err:
81c5a148
YZ		 3710 if (err >= 0)
3711 recon_state->nr_caps++;
3712 return err;
3713}
3714
3715static int encode_snap_realms(struct ceph_mds_client *mdsc,
3716 struct ceph_reconnect_state *recon_state)
3717{
3718 struct rb_node *p;
3719 struct ceph_pagelist *pagelist = recon_state->pagelist;
3720 int err = 0;
3721
3722 if (recon_state->msg_version >= 4) {
3723 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3724 if (err < 0)
3725 goto fail;
3726 }
3727
3728 /*
3729 * snaprealms. we provide mds with the ino, seq (version), and
3730 * parent for all of our realms. If the mds has any newer info,
3731 * it will tell us.
3732 */
3733 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3734 struct ceph_snap_realm *realm =
3735 rb_entry(p, struct ceph_snap_realm, node);
3736 struct ceph_mds_snaprealm_reconnect sr_rec;
3737
3738 if (recon_state->msg_version >= 4) {
3739 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3740 sizeof(sr_rec);
3741
3742 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3743 err = send_reconnect_partial(recon_state);
3744 if (err)
3745 goto fail;
3746 pagelist = recon_state->pagelist;
3747 }
3748
3749 err = ceph_pagelist_reserve(pagelist, need);
3750 if (err)
3751 goto fail;
3752
3753 ceph_pagelist_encode_8(pagelist, 1);
3754 ceph_pagelist_encode_8(pagelist, 1);
3755 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3756 }
3757
3758 dout(" adding snap realm %llx seq %lld parent %llx\n",
3759 realm->ino, realm->seq, realm->parent_ino);
3760 sr_rec.ino = cpu_to_le64(realm->ino);
3761 sr_rec.seq = cpu_to_le64(realm->seq);
3762 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3763
3764 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3765 if (err)
3766 goto fail;
3767
3768 recon_state->nr_realms++;
3769 }
3770fail:
93cea5be 3771 return err;
2f2dc053
SW		 3772}
3773
3774
3775/*
3776 * If an MDS fails and recovers, clients need to reconnect in order to
3777 * reestablish shared state. This includes all caps issued through
3778 * this session _and_ the snap_realm hierarchy. Because it's not
3779 * clear which snap realms the mds cares about, we send everything we
3780 * know about.. that ensures we'll then get any new info the
3781 * recovering MDS might have.
3782 *
3783 * This is a relatively heavyweight operation, but it's rare.
2f2dc053 3784 */
34b6c855
SW		 3785static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3786 struct ceph_mds_session *session)
2f2dc053 3787{
2f2dc053 3788 struct ceph_msg *reply;
34b6c855 3789 int mds = session->s_mds;
9abf82b8 3790 int err = -ENOMEM;
81c5a148
YZ		 3791 struct ceph_reconnect_state recon_state = {
3792 .session = session,
3793 };
c8a96a31 3794 LIST_HEAD(dispose);
2f2dc053 3795
34b6c855 3796 pr_info("mds%d reconnect start\n", mds);
2f2dc053 3797
81c5a148
YZ		 3798 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3799 if (!recon_state.pagelist)
93cea5be 3800 goto fail_nopagelist;
93cea5be 3801
0d9c1ab3 3802 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 3803 if (!reply)
93cea5be 3804 goto fail_nomsg;
93cea5be 3805
d4846487
JL		 3806 xa_destroy(&session->s_delegated_inos);
3807
34b6c855
SW		 3808 mutex_lock(&session->s_mutex);
3809 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3810 session->s_seq = 0;
2f2dc053 3811
2f2dc053 3812 dout("session %p state %s\n", session,
a687ecaf 3813 ceph_session_state_name(session->s_state));
2f2dc053 3814
99a9c273
YZ		 3815 spin_lock(&session->s_gen_ttl_lock);
3816 session->s_cap_gen++;
3817 spin_unlock(&session->s_gen_ttl_lock);
3818
3819 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 3820 /* don't know if session is readonly */
3821 session->s_readonly = 0;
99a9c273
YZ		 3822 /*
3823 * notify __ceph_remove_cap() that we are composing cap reconnect.
3824 * If a cap get released before being added to the cap reconnect,
3825 * __ceph_remove_cap() should skip queuing cap release.
3826 */
3827 session->s_cap_reconnect = 1;
e01a5946 3828 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 3829 detach_cap_releases(session, &dispose);
3830 spin_unlock(&session->s_cap_lock);
3831 dispose_cap_releases(mdsc, &dispose);
e01a5946 3832
5d23371f 3833 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 3834 if (mdsc->fsc->sb->s_root)
3835 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 3836
3837 ceph_con_close(&session->s_con);
3838 ceph_con_open(&session->s_con,
3839 CEPH_ENTITY_TYPE_MDS, mds,
3840 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3841
3842 /* replay unsafe requests */
3843 replay_unsafe_requests(mdsc, session);
3844
81c5a148
YZ		 3845 ceph_early_kick_flushing_caps(mdsc, session);
3846
5d23371f
YZ		 3847 down_read(&mdsc->snap_rwsem);
3848
81c5a148
YZ		 3849 /* placeholder for nr_caps */
3850 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 3851 if (err)
3852 goto fail;
20cb34ae 3853
81c5a148 3854 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 3855 recon_state.msg_version = 3;
81c5a148
YZ		 3856 recon_state.allow_multi = true;
3857 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3858 recon_state.msg_version = 3;
3859 } else {
23c625ce 3860 recon_state.msg_version = 2;
81c5a148
YZ		 3861 }
3862 /* trsaverse this session's caps */
a25949b9 3863 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
2f2dc053 3864
99a9c273
YZ		 3865 spin_lock(&session->s_cap_lock);
3866 session->s_cap_reconnect = 0;
3867 spin_unlock(&session->s_cap_lock);
3868
81c5a148
YZ		 3869 if (err < 0)
3870 goto fail;
2f2dc053 3871
81c5a148
YZ		 3872 /* check if all realms can be encoded into current message */
3873 if (mdsc->num_snap_realms) {
3874 size_t total_len =
3875 recon_state.pagelist->length +
3876 mdsc->num_snap_realms *
3877 sizeof(struct ceph_mds_snaprealm_reconnect);
3878 if (recon_state.msg_version >= 4) {
3879 /* number of realms */
3880 total_len += sizeof(u32);
3881 /* version, compat_version and struct_len */
3882 total_len += mdsc->num_snap_realms *
3883 (2 * sizeof(u8) + sizeof(u32));
3884 }
3885 if (total_len > RECONNECT_MAX_SIZE) {
3886 if (!recon_state.allow_multi) {
3887 err = -ENOSPC;
3888 goto fail;
3889 }
3890 if (recon_state.nr_caps) {
3891 err = send_reconnect_partial(&recon_state);
3892 if (err)
3893 goto fail;
3894 }
3895 recon_state.msg_version = 5;
3896 }
2f2dc053 3897 }
2f2dc053 3898
81c5a148
YZ		 3899 err = encode_snap_realms(mdsc, &recon_state);
3900 if (err < 0)
3901 goto fail;
3902
3903 if (recon_state.msg_version >= 5) {
3904 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3905 if (err < 0)
3906 goto fail;
3907 }
44c99757 3908
81c5a148
YZ		 3909 if (recon_state.nr_caps || recon_state.nr_realms) {
3910 struct page *page =
3911 list_first_entry(&recon_state.pagelist->head,
3912 struct page, lru);
44c99757 3913 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 3914 if (recon_state.nr_caps) {
3915 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3916 *addr = cpu_to_le32(recon_state.nr_caps);
3917 } else if (recon_state.msg_version >= 4) {
3918 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3919 }
44c99757 3920 kunmap_atomic(addr);
ebf18f47 3921 }
44c99757 3922
81c5a148
YZ		 3923 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3924 if (recon_state.msg_version >= 4)
3925 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 3926
81c5a148
YZ		 3927 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3928 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 3929
2f2dc053
SW		 3930 ceph_con_send(&session->s_con, reply);
3931
9abf82b8
SW		 3932 mutex_unlock(&session->s_mutex);
3933
3934 mutex_lock(&mdsc->mutex);
3935 __wake_requests(mdsc, &session->s_waiting);
3936 mutex_unlock(&mdsc->mutex);
3937
2f2dc053 3938 up_read(&mdsc->snap_rwsem);
81c5a148 3939 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 3940 return;
3941
93cea5be 3942fail:
2f2dc053 3943 ceph_msg_put(reply);
9abf82b8
SW		 3944 up_read(&mdsc->snap_rwsem);
3945 mutex_unlock(&session->s_mutex);
93cea5be 3946fail_nomsg:
81c5a148 3947 ceph_pagelist_release(recon_state.pagelist);
93cea5be 3948fail_nopagelist:
9abf82b8 3949 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
9abf82b8 3950 return;
2f2dc053
SW		 3951}
3952
3953
3954/*
3955 * compare old and new mdsmaps, kicking requests
3956 * and closing out old connections as necessary
3957 *
3958 * called under mdsc->mutex.
3959 */
3960static void check_new_map(struct ceph_mds_client *mdsc,
3961 struct ceph_mdsmap *newmap,
3962 struct ceph_mdsmap *oldmap)
3963{
3964 int i;
3965 int oldstate, newstate;
3966 struct ceph_mds_session *s;
3967
3968 dout("check_new_map new %u old %u\n",
3969 newmap->m_epoch, oldmap->m_epoch);
3970
b38c9eb4 3971 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
d37b1d99 3972 if (!mdsc->sessions[i])
2f2dc053
SW		 3973 continue;
3974 s = mdsc->sessions[i];
3975 oldstate = ceph_mdsmap_get_state(oldmap, i);
3976 newstate = ceph_mdsmap_get_state(newmap, i);
3977
0deb01c9 3978 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2f2dc053 3979 i, ceph_mds_state_name(oldstate),
0deb01c9 3980 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2f2dc053 3981 ceph_mds_state_name(newstate),
0deb01c9 3982 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
a687ecaf 3983 ceph_session_state_name(s->s_state));
2f2dc053 3984
b38c9eb4 3985 if (i >= newmap->possible_max_rank) {
6f0f597b 3986 /* force close session for stopped mds */
5b3248c6 3987 ceph_get_mds_session(s);
6f0f597b
YZ		 3988 __unregister_session(mdsc, s);
3989 __wake_requests(mdsc, &s->s_waiting);
3990 mutex_unlock(&mdsc->mutex);
2827528d 3991
6f0f597b
YZ		 3992 mutex_lock(&s->s_mutex);
3993 cleanup_session_requests(mdsc, s);
3994 remove_session_caps(s);
3995 mutex_unlock(&s->s_mutex);
2827528d 3996
6f0f597b 3997 ceph_put_mds_session(s);
2827528d 3998
6f0f597b
YZ		 3999 mutex_lock(&mdsc->mutex);
4000 kick_requests(mdsc, i);
4001 continue;
4002 }
4003
4004 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4005 ceph_mdsmap_get_addr(newmap, i),
4006 sizeof(struct ceph_entity_addr))) {
4007 /* just close it */
4008 mutex_unlock(&mdsc->mutex);
4009 mutex_lock(&s->s_mutex);
4010 mutex_lock(&mdsc->mutex);
4011 ceph_con_close(&s->s_con);
4012 mutex_unlock(&s->s_mutex);
4013 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 4014 } else if (oldstate == newstate) {
4015 continue; /* nothing new with this mds */
4016 }
4017
4018 /*
4019 * send reconnect?
4020 */
4021 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 4022 newstate >= CEPH_MDS_STATE_RECONNECT) {
4023 mutex_unlock(&mdsc->mutex);
4024 send_mds_reconnect(mdsc, s);
4025 mutex_lock(&mdsc->mutex);
4026 }
2f2dc053
SW		 4027
4028 /*
29790f26 4029 * kick request on any mds that has gone active.
2f2dc053
SW		 4030 */
4031 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4032 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 4033 if (oldstate != CEPH_MDS_STATE_CREATING &&
4034 oldstate != CEPH_MDS_STATE_STARTING)
4035 pr_info("mds%d recovery completed\n", s->s_mds);
4036 kick_requests(mdsc, i);
ea8412b2 4037 mutex_unlock(&mdsc->mutex);
829ad4db 4038 mutex_lock(&s->s_mutex);
ea8412b2 4039 mutex_lock(&mdsc->mutex);
2f2dc053 4040 ceph_kick_flushing_caps(mdsc, s);
829ad4db 4041 mutex_unlock(&s->s_mutex);
d2f8bb27 4042 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 4043 }
4044 }
cb170a22 4045
b38c9eb4 4046 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
cb170a22
SW		 4047 s = mdsc->sessions[i];
4048 if (!s)
4049 continue;
4050 if (!ceph_mdsmap_is_laggy(newmap, i))
4051 continue;
4052 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4053 s->s_state == CEPH_MDS_SESSION_HUNG ||
4054 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4055 dout(" connecting to export targets of laggy mds%d\n",
4056 i);
4057 __open_export_target_sessions(mdsc, s);
4058 }
4059 }
2f2dc053
SW		 4060}
4061
4062
4063
4064/*
4065 * leases
4066 */
4067
4068/*
4069 * caller must hold session s_mutex, dentry->d_lock
4070 */
4071void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4072{
4073 struct ceph_dentry_info *di = ceph_dentry(dentry);
4074
4075 ceph_put_mds_session(di->lease_session);
4076 di->lease_session = NULL;
4077}
4078
2600d2dd
SW		 4079static void handle_lease(struct ceph_mds_client *mdsc,
4080 struct ceph_mds_session *session,
4081 struct ceph_msg *msg)
2f2dc053 4082{
3d14c5d2 4083 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 4084 struct inode *inode;
2f2dc053
SW		 4085 struct dentry *parent, *dentry;
4086 struct ceph_dentry_info *di;
2600d2dd 4087 int mds = session->s_mds;
2f2dc053 4088 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 4089 u32 seq;
2f2dc053 4090 struct ceph_vino vino;
2f2dc053
SW		 4091 struct qstr dname;
4092 int release = 0;
4093
2f2dc053
SW		 4094 dout("handle_lease from mds%d\n", mds);
4095
4096 /* decode */
4097 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4098 goto bad;
4099 vino.ino = le64_to_cpu(h->ino);
4100 vino.snap = CEPH_NOSNAP;
1e5ea23d 4101 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 4102 dname.len = get_unaligned_le32(h + 1);
4103 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 4104 goto bad;
0fcf6c02 4105 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 4106
2f2dc053
SW		 4107 /* lookup inode */
4108 inode = ceph_find_inode(sb, vino);
2f90b852
SW		 4109 dout("handle_lease %s, ino %llx %p %.*s\n",
4110 ceph_lease_op_name(h->action), vino.ino, inode,
1e5ea23d 4111 dname.len, dname.name);
6cd3bcad
YZ		 4112
4113 mutex_lock(&session->s_mutex);
4114 session->s_seq++;
4115
d37b1d99 4116 if (!inode) {
2f2dc053
SW		 4117 dout("handle_lease no inode %llx\n", vino.ino);
4118 goto release;
4119 }
2f2dc053
SW		 4120
4121 /* dentry */
4122 parent = d_find_alias(inode);
4123 if (!parent) {
4124 dout("no parent dentry on inode %p\n", inode);
4125 WARN_ON(1);
4126 goto release; /* hrm... */
4127 }
8387ff25 4128 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 4129 dentry = d_lookup(parent, &dname);
4130 dput(parent);
4131 if (!dentry)
4132 goto release;
4133
4134 spin_lock(&dentry->d_lock);
4135 di = ceph_dentry(dentry);
4136 switch (h->action) {
4137 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 4138 if (di->lease_session == session) {
1e5ea23d
SW		 4139 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4140 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 4141 __ceph_mdsc_drop_dentry_lease(dentry);
4142 }
4143 release = 1;
4144 break;
4145
4146 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 4147 if (di->lease_session == session &&
2f2dc053
SW		 4148 di->lease_gen == session->s_cap_gen &&
4149 di->lease_renew_from &&
4150 di->lease_renew_after == 0) {
4151 unsigned long duration =
3563dbdd 4152 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 4153
1e5ea23d 4154 di->lease_seq = seq;
9b16f03c 4155 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 4156 di->lease_renew_after = di->lease_renew_from +
4157 (duration >> 1);
4158 di->lease_renew_from = 0;
4159 }
4160 break;
4161 }
4162 spin_unlock(&dentry->d_lock);
4163 dput(dentry);
4164
4165 if (!release)
4166 goto out;
4167
4168release:
4169 /* let's just reuse the same message */
4170 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4171 ceph_msg_get(msg);
4172 ceph_con_send(&session->s_con, msg);
4173
4174out:
2f2dc053 4175 mutex_unlock(&session->s_mutex);
3e1d0452
YZ		 4176 /* avoid calling iput_final() in mds dispatch threads */
4177 ceph_async_iput(inode);
2f2dc053
SW		 4178 return;
4179
4180bad:
4181 pr_err("corrupt lease message\n");
9ec7cab1 4182 ceph_msg_dump(msg);
2f2dc053
SW		 4183}
4184
4185void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 4186 struct dentry *dentry, char action,
4187 u32 seq)
4188{
4189 struct ceph_msg *msg;
4190 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 4191 struct inode *dir;
4192 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 4193
8f2a98ef
YZ		 4194 dout("lease_send_msg identry %p %s to mds%d\n",
4195 dentry, ceph_lease_op_name(action), session->s_mds);
2f2dc053 4196
b61c2763 4197 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 4198 if (!msg)
2f2dc053
SW		 4199 return;
4200 lease = msg->front.iov_base;
4201 lease->action = action;
2f2dc053 4202 lease->seq = cpu_to_le32(seq);
2f2dc053 4203
8f2a98ef
YZ		 4204 spin_lock(&dentry->d_lock);
4205 dir = d_inode(dentry->d_parent);
4206 lease->ino = cpu_to_le64(ceph_ino(dir));
4207 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
4208
4209 put_unaligned_le32(dentry->d_name.len, lease + 1);
4210 memcpy((void *)(lease + 1) + 4,
4211 dentry->d_name.name, dentry->d_name.len);
4212 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 4213 /*
4214 * if this is a preemptive lease RELEASE, no need to
4215 * flush request stream, since the actual request will
4216 * soon follow.
4217 */
4218 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4219
4220 ceph_con_send(&session->s_con, msg);
4221}
4222
2f2dc053 4223/*
7aac453a 4224 * lock unlock sessions, to wait ongoing session activities
2f2dc053 4225 */
7aac453a 4226static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
2f2dc053
SW		 4227{
4228 int i;
4229
2f2dc053
SW		 4230 mutex_lock(&mdsc->mutex);
4231 for (i = 0; i < mdsc->max_sessions; i++) {
4232 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4233 if (!s)
4234 continue;
4235 mutex_unlock(&mdsc->mutex);
4236 mutex_lock(&s->s_mutex);
4237 mutex_unlock(&s->s_mutex);
4238 ceph_put_mds_session(s);
4239 mutex_lock(&mdsc->mutex);
4240 }
4241 mutex_unlock(&mdsc->mutex);
4242}
4243
131d7eb4
YZ		 4244static void maybe_recover_session(struct ceph_mds_client *mdsc)
4245{
4246 struct ceph_fs_client *fsc = mdsc->fsc;
4247
4248 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4249 return;
2f2dc053 4250
131d7eb4
YZ		 4251 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4252 return;
4253
4254 if (!READ_ONCE(fsc->blacklisted))
4255 return;
4256
4257 if (fsc->last_auto_reconnect &&
4258 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4259 return;
4260
4261 pr_info("auto reconnect after blacklisted\n");
4262 fsc->last_auto_reconnect = jiffies;
4263 ceph_force_reconnect(fsc->sb);
4264}
2f2dc053
SW		 4265
4266/*
4267 * delayed work -- periodically trim expired leases, renew caps with mds
4268 */
4269static void schedule_delayed(struct ceph_mds_client *mdsc)
4270{
4271 int delay = 5;
4272 unsigned hz = round_jiffies_relative(HZ * delay);
4273 schedule_delayed_work(&mdsc->delayed_work, hz);
4274}
4275
4276static void delayed_work(struct work_struct *work)
4277{
4278 int i;
4279 struct ceph_mds_client *mdsc =
4280 container_of(work, struct ceph_mds_client, delayed_work.work);
4281 int renew_interval;
4282 int renew_caps;
4283
4284 dout("mdsc delayed_work\n");
75c9627e 4285
2f2dc053
SW		 4286 mutex_lock(&mdsc->mutex);
4287 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4288 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4289 mdsc->last_renew_caps);
4290 if (renew_caps)
4291 mdsc->last_renew_caps = jiffies;
4292
4293 for (i = 0; i < mdsc->max_sessions; i++) {
4294 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 4295 if (!s)
2f2dc053
SW		 4296 continue;
4297 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4298 dout("resending session close request for mds%d\n",
4299 s->s_mds);
4300 request_close_session(mdsc, s);
4301 ceph_put_mds_session(s);
4302 continue;
4303 }
4304 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4305 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4306 s->s_state = CEPH_MDS_SESSION_HUNG;
4307 pr_info("mds%d hung\n", s->s_mds);
4308 }
4309 }
71a228bc
EC		 4310 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4311 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4312 s->s_state == CEPH_MDS_SESSION_REJECTED) {
2f2dc053
SW		 4313 /* this mds is failed or recovering, just wait */
4314 ceph_put_mds_session(s);
4315 continue;
4316 }
4317 mutex_unlock(&mdsc->mutex);
4318
4319 mutex_lock(&s->s_mutex);
4320 if (renew_caps)
4321 send_renew_caps(mdsc, s);
4322 else
4323 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 4324 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4325 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 4326 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 4327 mutex_unlock(&s->s_mutex);
4328 ceph_put_mds_session(s);
4329
4330 mutex_lock(&mdsc->mutex);
4331 }
4332 mutex_unlock(&mdsc->mutex);
4333
37c4efc1
YZ		 4334 ceph_check_delayed_caps(mdsc);
4335
4336 ceph_queue_cap_reclaim_work(mdsc);
4337
4338 ceph_trim_snapid_map(mdsc);
4339
131d7eb4
YZ		 4340 maybe_recover_session(mdsc);
4341
2f2dc053
SW		 4342 schedule_delayed(mdsc);
4343}
4344
3d14c5d2 4345int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 4346
2f2dc053 4347{
3d14c5d2 4348 struct ceph_mds_client *mdsc;
f9009efa 4349 int err;
3d14c5d2
YS		 4350
4351 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4352 if (!mdsc)
4353 return -ENOMEM;
4354 mdsc->fsc = fsc;
2f2dc053
SW		 4355 mutex_init(&mdsc->mutex);
4356 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 4357 if (!mdsc->mdsmap) {
f9009efa
XL		 4358 err = -ENOMEM;
4359 goto err_mdsc;
fb3101b6 4360 }
2d06eeb8 4361
50c55aec 4362 fsc->mdsc = mdsc;
2f2dc053 4363 init_completion(&mdsc->safe_umount_waiters);
f3c60c59 4364 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053
SW		 4365 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4366 mdsc->sessions = NULL;
86d8f67b 4367 atomic_set(&mdsc->num_sessions, 0);
2f2dc053
SW		 4368 mdsc->max_sessions = 0;
4369 mdsc->stopping = 0;
d557c48d 4370 atomic64_set(&mdsc->quotarealms_count, 0);
0c44a8e0
LH		 4371 mdsc->quotarealms_inodes = RB_ROOT;
4372 mutex_init(&mdsc->quotarealms_inodes_mutex);
affbc19a 4373 mdsc->last_snap_seq = 0;
2f2dc053 4374 init_rwsem(&mdsc->snap_rwsem);
a105f00c 4375 mdsc->snap_realms = RB_ROOT;
2f2dc053 4376 INIT_LIST_HEAD(&mdsc->snap_empty);
81c5a148 4377 mdsc->num_snap_realms = 0;
2f2dc053
SW		 4378 spin_lock_init(&mdsc->snap_empty_lock);
4379 mdsc->last_tid = 0;
e8a7b8b1 4380 mdsc->oldest_tid = 0;
44ca18f2 4381 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 4382 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4383 mdsc->last_renew_caps = jiffies;
4384 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3a3430af 4385 INIT_LIST_HEAD(&mdsc->cap_wait_list);
2f2dc053
SW		 4386 spin_lock_init(&mdsc->cap_delay_lock);
4387 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4388 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 4389 mdsc->last_cap_flush_tid = 1;
e4500b5e 4390 INIT_LIST_HEAD(&mdsc->cap_flush_list);
db354052 4391 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 4392 mdsc->num_cap_flushing = 0;
4393 spin_lock_init(&mdsc->cap_dirty_lock);
4394 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 4395 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
fe33032d 4396 atomic_set(&mdsc->cap_reclaim_pending, 0);
f9009efa
XL		 4397 err = ceph_metric_init(&mdsc->metric);
4398 if (err)
4399 goto err_mdsmap;
37c4efc1
YZ		 4400
4401 spin_lock_init(&mdsc->dentry_list_lock);
4402 INIT_LIST_HEAD(&mdsc->dentry_leases);
4403 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 4404
37151668 4405 ceph_caps_init(mdsc);
fe33032d 4406 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 4407
75c9627e
YZ		 4408 spin_lock_init(&mdsc->snapid_map_lock);
4409 mdsc->snapid_map_tree = RB_ROOT;
4410 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4411
10183a69
YZ		 4412 init_rwsem(&mdsc->pool_perm_rwsem);
4413 mdsc->pool_perm_tree = RB_ROOT;
4414
dfeb84d4
YZ		 4415 strscpy(mdsc->nodename, utsname()->nodename,
4416 sizeof(mdsc->nodename));
5f44f142 4417 return 0;
f9009efa
XL		 4418
4419err_mdsmap:
4420 kfree(mdsc->mdsmap);
4421err_mdsc:
4422 kfree(mdsc);
4423 return err;
2f2dc053
SW		 4424}
4425
4426/*
4427 * Wait for safe replies on open mds requests. If we time out, drop
4428 * all requests from the tree to avoid dangling dentry refs.
4429 */
4430static void wait_requests(struct ceph_mds_client *mdsc)
4431{
a319bf56 4432 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 4433 struct ceph_mds_request *req;
2f2dc053
SW		 4434
4435 mutex_lock(&mdsc->mutex);
44ca18f2 4436 if (__get_oldest_req(mdsc)) {
2f2dc053 4437 mutex_unlock(&mdsc->mutex);
44ca18f2 4438
2f2dc053
SW		 4439 dout("wait_requests waiting for requests\n");
4440 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 4441 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4442
4443 /* tear down remaining requests */
44ca18f2
SW		 4444 mutex_lock(&mdsc->mutex);
4445 while ((req = __get_oldest_req(mdsc))) {
2f2dc053
SW		 4446 dout("wait_requests timed out on tid %llu\n",
4447 req->r_tid);
428138c9 4448 list_del_init(&req->r_wait);
44ca18f2 4449 __unregister_request(mdsc, req);
2f2dc053
SW		 4450 }
4451 }
4452 mutex_unlock(&mdsc->mutex);
4453 dout("wait_requests done\n");
4454}
4455
4456/*
4457 * called before mount is ro, and before dentries are torn down.
4458 * (hmm, does this still race with new lookups?)
4459 */
4460void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4461{
4462 dout("pre_umount\n");
4463 mdsc->stopping = 1;
4464
7aac453a 4465 lock_unlock_sessions(mdsc);
afcdaea3 4466 ceph_flush_dirty_caps(mdsc);
2f2dc053 4467 wait_requests(mdsc);
17c688c3
SW		 4468
4469 /*
4470 * wait for reply handlers to drop their request refs and
4471 * their inode/dcache refs
4472 */
4473 ceph_msgr_flush();
0c44a8e0
LH		 4474
4475 ceph_cleanup_quotarealms_inodes(mdsc);
2f2dc053
SW		 4476}
4477
4478/*
4479 * wait for all write mds requests to flush.
4480 */
4481static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4482{
80fc7314 4483 struct ceph_mds_request *req = NULL, *nextreq;
44ca18f2 4484 struct rb_node *n;
2f2dc053
SW		 4485
4486 mutex_lock(&mdsc->mutex);
4487 dout("wait_unsafe_requests want %lld\n", want_tid);
80fc7314 4488restart:
44ca18f2
SW		 4489 req = __get_oldest_req(mdsc);
4490 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 4491 /* find next request */
4492 n = rb_next(&req->r_node);
4493 if (n)
4494 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4495 else
4496 nextreq = NULL;
e8a7b8b1
YZ		 4497 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4498 (req->r_op & CEPH_MDS_OP_WRITE)) {
44ca18f2
SW		 4499 /* write op */
4500 ceph_mdsc_get_request(req);
80fc7314
SW		 4501 if (nextreq)
4502 ceph_mdsc_get_request(nextreq);
44ca18f2
SW		 4503 mutex_unlock(&mdsc->mutex);
4504 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4505 req->r_tid, want_tid);
4506 wait_for_completion(&req->r_safe_completion);
4507 mutex_lock(&mdsc->mutex);
44ca18f2 4508 ceph_mdsc_put_request(req);
80fc7314
SW		 4509 if (!nextreq)
4510 break; /* next dne before, so we're done! */
4511 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4512 /* next request was removed from tree */
4513 ceph_mdsc_put_request(nextreq);
4514 goto restart;
4515 }
4516 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 4517 }
80fc7314 4518 req = nextreq;
2f2dc053
SW		 4519 }
4520 mutex_unlock(&mdsc->mutex);
4521 dout("wait_unsafe_requests done\n");
4522}
4523
4524void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4525{
0e294387 4526 u64 want_tid, want_flush;
2f2dc053 4527
52953d55 4528 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 4529 return;
4530
2f2dc053
SW		 4531 dout("sync\n");
4532 mutex_lock(&mdsc->mutex);
4533 want_tid = mdsc->last_tid;
2f2dc053 4534 mutex_unlock(&mdsc->mutex);
2f2dc053 4535
afcdaea3 4536 ceph_flush_dirty_caps(mdsc);
d3383a8e 4537 spin_lock(&mdsc->cap_dirty_lock);
8310b089 4538 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 4539 if (!list_empty(&mdsc->cap_flush_list)) {
4540 struct ceph_cap_flush *cf =
4541 list_last_entry(&mdsc->cap_flush_list,
4542 struct ceph_cap_flush, g_list);
4543 cf->wake = true;
4544 }
d3383a8e
YZ		 4545 spin_unlock(&mdsc->cap_dirty_lock);
4546
0e294387
YZ		 4547 dout("sync want tid %lld flush_seq %lld\n",
4548 want_tid, want_flush);
2f2dc053
SW		 4549
4550 wait_unsafe_requests(mdsc, want_tid);
0e294387 4551 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 4552}
4553
f3c60c59
SW		 4554/*
4555 * true if all sessions are closed, or we force unmount
4556 */
fcff415c 4557static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 4558{
52953d55 4559 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 4560 return true;
fcff415c 4561 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 4562}
2f2dc053
SW		 4563
4564/*
4565 * called after sb is ro.
4566 */
4567void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4568{
a319bf56 4569 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053
SW		 4570 struct ceph_mds_session *session;
4571 int i;
fcff415c 4572 int skipped = 0;
2f2dc053
SW		 4573
4574 dout("close_sessions\n");
4575
2f2dc053 4576 /* close sessions */
f3c60c59
SW		 4577 mutex_lock(&mdsc->mutex);
4578 for (i = 0; i < mdsc->max_sessions; i++) {
4579 session = __ceph_lookup_mds_session(mdsc, i);
4580 if (!session)
4581 continue;
2f2dc053 4582 mutex_unlock(&mdsc->mutex);
f3c60c59 4583 mutex_lock(&session->s_mutex);
fcff415c
YZ		 4584 if (__close_session(mdsc, session) <= 0)
4585 skipped++;
f3c60c59
SW		 4586 mutex_unlock(&session->s_mutex);
4587 ceph_put_mds_session(session);
2f2dc053
SW		 4588 mutex_lock(&mdsc->mutex);
4589 }
f3c60c59
SW		 4590 mutex_unlock(&mdsc->mutex);
4591
4592 dout("waiting for sessions to close\n");
fcff415c
YZ		 4593 wait_event_timeout(mdsc->session_close_wq,
4594 done_closing_sessions(mdsc, skipped),
a319bf56 4595 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 4596
4597 /* tear down remaining sessions */
f3c60c59 4598 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 4599 for (i = 0; i < mdsc->max_sessions; i++) {
4600 if (mdsc->sessions[i]) {
5b3248c6 4601 session = ceph_get_mds_session(mdsc->sessions[i]);
2600d2dd 4602 __unregister_session(mdsc, session);
2f2dc053
SW		 4603 mutex_unlock(&mdsc->mutex);
4604 mutex_lock(&session->s_mutex);
4605 remove_session_caps(session);
4606 mutex_unlock(&session->s_mutex);
4607 ceph_put_mds_session(session);
4608 mutex_lock(&mdsc->mutex);
4609 }
4610 }
2f2dc053 4611 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 4612 mutex_unlock(&mdsc->mutex);
4613
75c9627e 4614 ceph_cleanup_snapid_map(mdsc);
2f2dc053
SW		 4615 ceph_cleanup_empty_realms(mdsc);
4616
37c4efc1 4617 cancel_work_sync(&mdsc->cap_reclaim_work);
2f2dc053
SW		 4618 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4619
4620 dout("stopped\n");
4621}
4622
48fec5d0
YZ		 4623void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4624{
4625 struct ceph_mds_session *session;
4626 int mds;
4627
4628 dout("force umount\n");
4629
4630 mutex_lock(&mdsc->mutex);
4631 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4632 session = __ceph_lookup_mds_session(mdsc, mds);
4633 if (!session)
4634 continue;
d468e729
YZ		 4635
4636 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4637 __unregister_session(mdsc, session);
4638 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 4639 mutex_unlock(&mdsc->mutex);
d468e729 4640
48fec5d0
YZ		 4641 mutex_lock(&session->s_mutex);
4642 __close_session(mdsc, session);
4643 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4644 cleanup_session_requests(mdsc, session);
4645 remove_session_caps(session);
4646 }
4647 mutex_unlock(&session->s_mutex);
4648 ceph_put_mds_session(session);
d468e729 4649
48fec5d0
YZ		 4650 mutex_lock(&mdsc->mutex);
4651 kick_requests(mdsc, mds);
4652 }
4653 __wake_requests(mdsc, &mdsc->waiting_for_map);
4654 mutex_unlock(&mdsc->mutex);
4655}
4656
3d14c5d2 4657static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053
SW		 4658{
4659 dout("stop\n");
4660 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4661 if (mdsc->mdsmap)
4662 ceph_mdsmap_destroy(mdsc->mdsmap);
4663 kfree(mdsc->sessions);
37151668 4664 ceph_caps_finalize(mdsc);
10183a69 4665 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 4666}
4667
3d14c5d2
YS		 4668void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4669{
4670 struct ceph_mds_client *mdsc = fsc->mdsc;
ef550f6f 4671 dout("mdsc_destroy %p\n", mdsc);
ef550f6f 4672
50c55aec
CX		 4673 if (!mdsc)
4674 return;
4675
ef550f6f
SW		 4676 /* flush out any connection work with references to us */
4677 ceph_msgr_flush();
4678
62a65f36
YZ		 4679 ceph_mdsc_stop(mdsc);
4680
f9009efa
XL		 4681 ceph_metric_destroy(&mdsc->metric);
4682
3d14c5d2
YS		 4683 fsc->mdsc = NULL;
4684 kfree(mdsc);
ef550f6f 4685 dout("mdsc_destroy %p done\n", mdsc);
3d14c5d2
YS		 4686}
4687
430afbad
YZ		 4688void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4689{
4690 struct ceph_fs_client *fsc = mdsc->fsc;
4691 const char *mds_namespace = fsc->mount_options->mds_namespace;
4692 void *p = msg->front.iov_base;
4693 void *end = p + msg->front.iov_len;
4694 u32 epoch;
4695 u32 map_len;
4696 u32 num_fs;
4697 u32 mount_fscid = (u32)-1;
4698 u8 struct_v, struct_cv;
4699 int err = -EINVAL;
4700
4701 ceph_decode_need(&p, end, sizeof(u32), bad);
4702 epoch = ceph_decode_32(&p);
4703
4704 dout("handle_fsmap epoch %u\n", epoch);
4705
4706 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4707 struct_v = ceph_decode_8(&p);
4708 struct_cv = ceph_decode_8(&p);
4709 map_len = ceph_decode_32(&p);
4710
4711 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4712 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4713
4714 num_fs = ceph_decode_32(&p);
4715 while (num_fs-- > 0) {
4716 void *info_p, *info_end;
4717 u32 info_len;
4718 u8 info_v, info_cv;
4719 u32 fscid, namelen;
4720
4721 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4722 info_v = ceph_decode_8(&p);
4723 info_cv = ceph_decode_8(&p);
4724 info_len = ceph_decode_32(&p);
4725 ceph_decode_need(&p, end, info_len, bad);
4726 info_p = p;
4727 info_end = p + info_len;
4728 p = info_end;
4729
4730 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4731 fscid = ceph_decode_32(&info_p);
4732 namelen = ceph_decode_32(&info_p);
4733 ceph_decode_need(&info_p, info_end, namelen, bad);
4734
4735 if (mds_namespace &&
4736 strlen(mds_namespace) == namelen &&
4737 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4738 mount_fscid = fscid;
4739 break;
4740 }
4741 }
4742
4743 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4744 if (mount_fscid != (u32)-1) {
4745 fsc->client->monc.fs_cluster_id = mount_fscid;
4746 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4747 0, true);
4748 ceph_monc_renew_subs(&fsc->client->monc);
4749 } else {
4750 err = -ENOENT;
4751 goto err_out;
4752 }
4753 return;
76bd6ec4 4754
430afbad
YZ		 4755bad:
4756 pr_err("error decoding fsmap\n");
4757err_out:
4758 mutex_lock(&mdsc->mutex);
76bd6ec4 4759 mdsc->mdsmap_err = err;
430afbad
YZ		 4760 __wake_requests(mdsc, &mdsc->waiting_for_map);
4761 mutex_unlock(&mdsc->mutex);
430afbad 4762}
2f2dc053
SW		 4763
4764/*
4765 * handle mds map update.
4766 */
430afbad 4767void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053
SW		 4768{
4769 u32 epoch;
4770 u32 maplen;
4771 void *p = msg->front.iov_base;
4772 void *end = p + msg->front.iov_len;
4773 struct ceph_mdsmap *newmap, *oldmap;
4774 struct ceph_fsid fsid;
4775 int err = -EINVAL;
4776
4777 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4778 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 4779 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 4780 return;
c89136ea
SW		 4781 epoch = ceph_decode_32(&p);
4782 maplen = ceph_decode_32(&p);
2f2dc053
SW		 4783 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4784
4785 /* do we need it? */
2f2dc053
SW		 4786 mutex_lock(&mdsc->mutex);
4787 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4788 dout("handle_map epoch %u <= our %u\n",
4789 epoch, mdsc->mdsmap->m_epoch);
4790 mutex_unlock(&mdsc->mutex);
4791 return;
4792 }
4793
4794 newmap = ceph_mdsmap_decode(&p, end);
4795 if (IS_ERR(newmap)) {
4796 err = PTR_ERR(newmap);
4797 goto bad_unlock;
4798 }
4799
4800 /* swap into place */
4801 if (mdsc->mdsmap) {
4802 oldmap = mdsc->mdsmap;
4803 mdsc->mdsmap = newmap;
4804 check_new_map(mdsc, newmap, oldmap);
4805 ceph_mdsmap_destroy(oldmap);
4806 } else {
4807 mdsc->mdsmap = newmap; /* first mds map */
4808 }
719784ba
CX		 4809 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4810 MAX_LFS_FILESIZE);
2f2dc053
SW		 4811
4812 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 4813 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4814 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 4815
4816 mutex_unlock(&mdsc->mutex);
4817 schedule_delayed(mdsc);
4818 return;
4819
4820bad_unlock:
4821 mutex_unlock(&mdsc->mutex);
4822bad:
4823 pr_err("error decoding mdsmap %d\n", err);
4824 return;
4825}
4826
4827static struct ceph_connection *con_get(struct ceph_connection *con)
4828{
4829 struct ceph_mds_session *s = con->private;
4830
5b3248c6 4831 if (ceph_get_mds_session(s))
2f2dc053 4832 return con;
2f2dc053
SW		 4833 return NULL;
4834}
4835
4836static void con_put(struct ceph_connection *con)
4837{
4838 struct ceph_mds_session *s = con->private;
4839
2f2dc053
SW		 4840 ceph_put_mds_session(s);
4841}
4842
4843/*
4844 * if the client is unresponsive for long enough, the mds will kill
4845 * the session entirely.
4846 */
4847static void peer_reset(struct ceph_connection *con)
4848{
4849 struct ceph_mds_session *s = con->private;
7e70f0ed 4850 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 4851
f3ae1b97 4852 pr_warn("mds%d closed our session\n", s->s_mds);
7e70f0ed 4853 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 4854}
4855
4856static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4857{
4858 struct ceph_mds_session *s = con->private;
4859 struct ceph_mds_client *mdsc = s->s_mdsc;
4860 int type = le16_to_cpu(msg->hdr.type);
4861
2600d2dd
SW		 4862 mutex_lock(&mdsc->mutex);
4863 if (__verify_registered_session(mdsc, s) < 0) {
4864 mutex_unlock(&mdsc->mutex);
4865 goto out;
4866 }
4867 mutex_unlock(&mdsc->mutex);
4868
2f2dc053
SW		 4869 switch (type) {
4870 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 4871 ceph_mdsc_handle_mdsmap(mdsc, msg);
4872 break;
4873 case CEPH_MSG_FS_MAP_USER:
4874 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 4875 break;
4876 case CEPH_MSG_CLIENT_SESSION:
4877 handle_session(s, msg);
4878 break;
4879 case CEPH_MSG_CLIENT_REPLY:
4880 handle_reply(s, msg);
4881 break;
4882 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 4883 handle_forward(mdsc, s, msg);
2f2dc053
SW		 4884 break;
4885 case CEPH_MSG_CLIENT_CAPS:
4886 ceph_handle_caps(s, msg);
4887 break;
4888 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 4889 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 4890 break;
4891 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 4892 handle_lease(mdsc, s, msg);
2f2dc053 4893 break;
fb18a575
LH		 4894 case CEPH_MSG_CLIENT_QUOTA:
4895 ceph_handle_quota(mdsc, s, msg);
4896 break;
2f2dc053
SW		 4897
4898 default:
4899 pr_err("received unknown message type %d %s\n", type,
4900 ceph_msg_type_name(type));
4901 }
2600d2dd 4902out:
2f2dc053
SW		 4903 ceph_msg_put(msg);
4904}
4905
4e7a5dcd
SW		 4906/*
4907 * authentication
4908 */
a3530df3
AE		 4909
4910/*
4911 * Note: returned pointer is the address of a structure that's
4912 * managed separately. Caller must *not* attempt to free it.
4913 */
4914static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
8f43fb53 4915 int *proto, int force_new)
4e7a5dcd
SW		 4916{
4917 struct ceph_mds_session *s = con->private;
4918 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4919 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 4920 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 4921
74f1869f 4922 if (force_new && auth->authorizer) {
6c1ea260 4923 ceph_auth_destroy_authorizer(auth->authorizer);
74f1869f 4924 auth->authorizer = NULL;
4e7a5dcd 4925 }
27859f97
SW		 4926 if (!auth->authorizer) {
4927 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4928 auth);
0bed9b5c
SW		 4929 if (ret)
4930 return ERR_PTR(ret);
27859f97
SW		 4931 } else {
4932 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4933 auth);
a255651d 4934 if (ret)
a3530df3 4935 return ERR_PTR(ret);
4e7a5dcd 4936 }
4e7a5dcd 4937 *proto = ac->protocol;
74f1869f 4938
a3530df3 4939 return auth;
4e7a5dcd
SW		 4940}
4941
6daca13d
ID		 4942static int add_authorizer_challenge(struct ceph_connection *con,
4943 void *challenge_buf, int challenge_buf_len)
4944{
4945 struct ceph_mds_session *s = con->private;
4946 struct ceph_mds_client *mdsc = s->s_mdsc;
4947 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4948
4949 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4950 challenge_buf, challenge_buf_len);
4951}
4e7a5dcd 4952
0dde5848 4953static int verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 4954{
4955 struct ceph_mds_session *s = con->private;
4956 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4957 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4e7a5dcd 4958
0dde5848 4959 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4e7a5dcd
SW		 4960}
4961
9bd2e6f8
SW		 4962static int invalidate_authorizer(struct ceph_connection *con)
4963{
4964 struct ceph_mds_session *s = con->private;
4965 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 4966 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 4967
27859f97 4968 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 4969
3d14c5d2 4970 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 4971}
4972
53ded495
AE		 4973static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4974 struct ceph_msg_header *hdr, int *skip)
4975{
4976 struct ceph_msg *msg;
4977 int type = (int) le16_to_cpu(hdr->type);
4978 int front_len = (int) le32_to_cpu(hdr->front_len);
4979
4980 if (con->in_msg)
4981 return con->in_msg;
4982
4983 *skip = 0;
4984 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4985 if (!msg) {
4986 pr_err("unable to allocate msg type %d len %d\n",
4987 type, front_len);
4988 return NULL;
4989 }
53ded495
AE		 4990
4991 return msg;
4992}
4993
79dbd1ba 4994static int mds_sign_message(struct ceph_msg *msg)
33d07337 4995{
79dbd1ba 4996 struct ceph_mds_session *s = msg->con->private;
33d07337 4997 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 4998
33d07337
YZ		 4999 return ceph_auth_sign_message(auth, msg);
5000}
5001
79dbd1ba 5002static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 5003{
79dbd1ba 5004 struct ceph_mds_session *s = msg->con->private;
33d07337 5005 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 5006
33d07337
YZ		 5007 return ceph_auth_check_message_signature(auth, msg);
5008}
5009
9e32789f 5010static const struct ceph_connection_operations mds_con_ops = {
2f2dc053
SW		 5011 .get = con_get,
5012 .put = con_put,
5013 .dispatch = dispatch,
4e7a5dcd 5014 .get_authorizer = get_authorizer,
6daca13d 5015 .add_authorizer_challenge = add_authorizer_challenge,
4e7a5dcd 5016 .verify_authorizer_reply = verify_authorizer_reply,
9bd2e6f8 5017 .invalidate_authorizer = invalidate_authorizer,
2f2dc053 5018 .peer_reset = peer_reset,
53ded495 5019 .alloc_msg = mds_alloc_msg,
79dbd1ba
ID		 5020 .sign_message = mds_sign_message,
5021 .check_message_signature = mds_check_message_signature,
2f2dc053
SW		 5022};
5023
2f2dc053 5024/* eof */
Linux 6.x block layer and io_uring tree(s)