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Merge tag 'pm-6.16-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
[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>
d517b398 14#include <linux/bitmap.h>
9c2df227 15#include <linux/mnt_idmapping.h>
2f2dc053 16
2f2dc053 17#include "super.h"
3d14c5d2 18#include "mds_client.h"
2d332d5b 19#include "crypto.h"
3d14c5d2 20
1fe60e51 21#include <linux/ceph/ceph_features.h>
3d14c5d2
YS		 22#include <linux/ceph/messenger.h>
23#include <linux/ceph/decode.h>
24#include <linux/ceph/pagelist.h>
25#include <linux/ceph/auth.h>
26#include <linux/ceph/debugfs.h>
2f2dc053 27
81c5a148
YZ		 28#define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
29
2f2dc053
SW		 30/*
31 * A cluster of MDS (metadata server) daemons is responsible for
32 * managing the file system namespace (the directory hierarchy and
33 * inodes) and for coordinating shared access to storage. Metadata is
34 * partitioning hierarchically across a number of servers, and that
35 * partition varies over time as the cluster adjusts the distribution
36 * in order to balance load.
37 *
38 * The MDS client is primarily responsible to managing synchronous
39 * metadata requests for operations like open, unlink, and so forth.
40 * If there is a MDS failure, we find out about it when we (possibly
41 * request and) receive a new MDS map, and can resubmit affected
42 * requests.
43 *
44 * For the most part, though, we take advantage of a lossless
45 * communications channel to the MDS, and do not need to worry about
46 * timing out or resubmitting requests.
47 *
48 * We maintain a stateful "session" with each MDS we interact with.
49 * Within each session, we sent periodic heartbeat messages to ensure
50 * any capabilities or leases we have been issues remain valid. If
51 * the session times out and goes stale, our leases and capabilities
52 * are no longer valid.
53 */
54
20cb34ae 55struct ceph_reconnect_state {
81c5a148
YZ		 56 struct ceph_mds_session *session;
57 int nr_caps, nr_realms;
20cb34ae 58 struct ceph_pagelist *pagelist;
121f22a1 59 unsigned msg_version;
81c5a148 60 bool allow_multi;
20cb34ae
SW		 61};
62
2f2dc053
SW		 63static void __wake_requests(struct ceph_mds_client *mdsc,
64 struct list_head *head);
e3ec8d68 65static void ceph_cap_release_work(struct work_struct *work);
37c4efc1 66static void ceph_cap_reclaim_work(struct work_struct *work);
2f2dc053 67
9e32789f 68static const struct ceph_connection_operations mds_con_ops;
2f2dc053
SW		 69
70
71/*
72 * mds reply parsing
73 */
74
b37fe1f9
YZ		 75static int parse_reply_info_quota(void **p, void *end,
76 struct ceph_mds_reply_info_in *info)
77{
78 u8 struct_v, struct_compat;
79 u32 struct_len;
80
81 ceph_decode_8_safe(p, end, struct_v, bad);
82 ceph_decode_8_safe(p, end, struct_compat, bad);
83 /* struct_v is expected to be >= 1. we only
84 * understand encoding with struct_compat == 1. */
85 if (!struct_v || struct_compat != 1)
86 goto bad;
87 ceph_decode_32_safe(p, end, struct_len, bad);
88 ceph_decode_need(p, end, struct_len, bad);
89 end = *p + struct_len;
90 ceph_decode_64_safe(p, end, info->max_bytes, bad);
91 ceph_decode_64_safe(p, end, info->max_files, bad);
92 *p = end;
93 return 0;
94bad:
95 return -EIO;
96}
97
2f2dc053
SW		 98/*
99 * parse individual inode info
100 */
101static int parse_reply_info_in(void **p, void *end,
14303d20 102 struct ceph_mds_reply_info_in *info,
12b4629a 103 u64 features)
2f2dc053 104{
b37fe1f9
YZ		 105 int err = 0;
106 u8 struct_v = 0;
2f2dc053 107
b37fe1f9
YZ		 108 if (features == (u64)-1) {
109 u32 struct_len;
110 u8 struct_compat;
111 ceph_decode_8_safe(p, end, struct_v, bad);
112 ceph_decode_8_safe(p, end, struct_compat, bad);
113 /* struct_v is expected to be >= 1. we only understand
114 * encoding with struct_compat == 1. */
115 if (!struct_v || struct_compat != 1)
116 goto bad;
117 ceph_decode_32_safe(p, end, struct_len, bad);
118 ceph_decode_need(p, end, struct_len, bad);
119 end = *p + struct_len;
120 }
121
122 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
2f2dc053
SW		 123 info->in = *p;
124 *p += sizeof(struct ceph_mds_reply_inode) +
125 sizeof(*info->in->fragtree.splits) *
126 le32_to_cpu(info->in->fragtree.nsplits);
127
128 ceph_decode_32_safe(p, end, info->symlink_len, bad);
129 ceph_decode_need(p, end, info->symlink_len, bad);
130 info->symlink = *p;
131 *p += info->symlink_len;
132
23c625ce
ID		 133 ceph_decode_copy_safe(p, end, &info->dir_layout,
134 sizeof(info->dir_layout), bad);
2f2dc053
SW		 135 ceph_decode_32_safe(p, end, info->xattr_len, bad);
136 ceph_decode_need(p, end, info->xattr_len, bad);
137 info->xattr_data = *p;
138 *p += info->xattr_len;
fb01d1f8 139
b37fe1f9
YZ		 140 if (features == (u64)-1) {
141 /* inline data */
fb01d1f8
YZ		 142 ceph_decode_64_safe(p, end, info->inline_version, bad);
143 ceph_decode_32_safe(p, end, info->inline_len, bad);
144 ceph_decode_need(p, end, info->inline_len, bad);
145 info->inline_data = *p;
146 *p += info->inline_len;
b37fe1f9
YZ		 147 /* quota */
148 err = parse_reply_info_quota(p, end, info);
149 if (err < 0)
150 goto out_bad;
151 /* pool namespace */
152 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
153 if (info->pool_ns_len > 0) {
154 ceph_decode_need(p, end, info->pool_ns_len, bad);
155 info->pool_ns_data = *p;
156 *p += info->pool_ns_len;
157 }
245ce991
JL		 158
159 /* btime */
160 ceph_decode_need(p, end, sizeof(info->btime), bad);
161 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
162
163 /* change attribute */
a35ead31 164 ceph_decode_64_safe(p, end, info->change_attr, bad);
fb01d1f8 165
08796873
YZ		 166 /* dir pin */
167 if (struct_v >= 2) {
168 ceph_decode_32_safe(p, end, info->dir_pin, bad);
169 } else {
170 info->dir_pin = -ENODATA;
171 }
172
193e7b37
DD		 173 /* snapshot birth time, remains zero for v<=2 */
174 if (struct_v >= 3) {
175 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
176 ceph_decode_copy(p, &info->snap_btime,
177 sizeof(info->snap_btime));
178 } else {
179 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
180 }
181
e7f72952
YC		 182 /* snapshot count, remains zero for v<=3 */
183 if (struct_v >= 4) {
184 ceph_decode_64_safe(p, end, info->rsnaps, bad);
185 } else {
186 info->rsnaps = 0;
187 }
188
2d332d5b
JL		 189 if (struct_v >= 5) {
190 u32 alen;
191
192 ceph_decode_32_safe(p, end, alen, bad);
193
194 while (alen--) {
195 u32 len;
196
197 /* key */
198 ceph_decode_32_safe(p, end, len, bad);
199 ceph_decode_skip_n(p, end, len, bad);
200 /* value */
201 ceph_decode_32_safe(p, end, len, bad);
202 ceph_decode_skip_n(p, end, len, bad);
203 }
204 }
205
206 /* fscrypt flag -- ignore */
207 if (struct_v >= 6)
208 ceph_decode_skip_8(p, end, bad);
209
210 info->fscrypt_auth = NULL;
211 info->fscrypt_auth_len = 0;
212 info->fscrypt_file = NULL;
213 info->fscrypt_file_len = 0;
214 if (struct_v >= 7) {
215 ceph_decode_32_safe(p, end, info->fscrypt_auth_len, bad);
216 if (info->fscrypt_auth_len) {
217 info->fscrypt_auth = kmalloc(info->fscrypt_auth_len,
218 GFP_KERNEL);
219 if (!info->fscrypt_auth)
220 return -ENOMEM;
221 ceph_decode_copy_safe(p, end, info->fscrypt_auth,
222 info->fscrypt_auth_len, bad);
223 }
224 ceph_decode_32_safe(p, end, info->fscrypt_file_len, bad);
225 if (info->fscrypt_file_len) {
226 info->fscrypt_file = kmalloc(info->fscrypt_file_len,
227 GFP_KERNEL);
228 if (!info->fscrypt_file)
229 return -ENOMEM;
230 ceph_decode_copy_safe(p, end, info->fscrypt_file,
231 info->fscrypt_file_len, bad);
232 }
233 }
b37fe1f9
YZ		 234 *p = end;
235 } else {
2d332d5b 236 /* legacy (unversioned) struct */
b37fe1f9
YZ		 237 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
238 ceph_decode_64_safe(p, end, info->inline_version, bad);
239 ceph_decode_32_safe(p, end, info->inline_len, bad);
240 ceph_decode_need(p, end, info->inline_len, bad);
241 info->inline_data = *p;
242 *p += info->inline_len;
243 } else
244 info->inline_version = CEPH_INLINE_NONE;
245
246 if (features & CEPH_FEATURE_MDS_QUOTA) {
247 err = parse_reply_info_quota(p, end, info);
248 if (err < 0)
249 goto out_bad;
250 } else {
251 info->max_bytes = 0;
252 info->max_files = 0;
253 }
254
255 info->pool_ns_len = 0;
256 info->pool_ns_data = NULL;
257 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
258 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
259 if (info->pool_ns_len > 0) {
260 ceph_decode_need(p, end, info->pool_ns_len, bad);
261 info->pool_ns_data = *p;
262 *p += info->pool_ns_len;
263 }
264 }
08796873 265
245ce991
JL		 266 if (features & CEPH_FEATURE_FS_BTIME) {
267 ceph_decode_need(p, end, sizeof(info->btime), bad);
268 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
a35ead31 269 ceph_decode_64_safe(p, end, info->change_attr, bad);
245ce991
JL		 270 }
271
08796873 272 info->dir_pin = -ENODATA;
e7f72952 273 /* info->snap_btime and info->rsnaps remain zero */
b37fe1f9
YZ		 274 }
275 return 0;
276bad:
277 err = -EIO;
278out_bad:
279 return err;
280}
281
282static int parse_reply_info_dir(void **p, void *end,
283 struct ceph_mds_reply_dirfrag **dirfrag,
284 u64 features)
285{
286 if (features == (u64)-1) {
fb18a575
LH		 287 u8 struct_v, struct_compat;
288 u32 struct_len;
fb18a575
LH		 289 ceph_decode_8_safe(p, end, struct_v, bad);
290 ceph_decode_8_safe(p, end, struct_compat, bad);
b37fe1f9
YZ		 291 /* struct_v is expected to be >= 1. we only understand
292 * encoding whose struct_compat == 1. */
293 if (!struct_v || struct_compat != 1)
fb18a575
LH		 294 goto bad;
295 ceph_decode_32_safe(p, end, struct_len, bad);
296 ceph_decode_need(p, end, struct_len, bad);
b37fe1f9 297 end = *p + struct_len;
fb18a575
LH		 298 }
299
b37fe1f9
YZ		 300 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
301 *dirfrag = *p;
302 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
303 if (unlikely(*p > end))
304 goto bad;
305 if (features == (u64)-1)
306 *p = end;
307 return 0;
308bad:
309 return -EIO;
310}
311
312static int parse_reply_info_lease(void **p, void *end,
313 struct ceph_mds_reply_lease **lease,
4ac4c23e 314 u64 features, u32 *altname_len, u8 **altname)
b37fe1f9 315{
4ac4c23e
JL		 316 u8 struct_v;
317 u32 struct_len;
318 void *lend;
319
b37fe1f9 320 if (features == (u64)-1) {
4ac4c23e
JL		 321 u8 struct_compat;
322
b37fe1f9
YZ		 323 ceph_decode_8_safe(p, end, struct_v, bad);
324 ceph_decode_8_safe(p, end, struct_compat, bad);
4ac4c23e 325
b37fe1f9
YZ		 326 /* struct_v is expected to be >= 1. we only understand
327 * encoding whose struct_compat == 1. */
328 if (!struct_v || struct_compat != 1)
329 goto bad;
4ac4c23e 330
b37fe1f9 331 ceph_decode_32_safe(p, end, struct_len, bad);
4ac4c23e
JL		 332 } else {
333 struct_len = sizeof(**lease);
334 *altname_len = 0;
335 *altname = NULL;
5ea5c5e0
YZ		 336 }
337
4ac4c23e
JL		 338 lend = *p + struct_len;
339 ceph_decode_need(p, end, struct_len, bad);
b37fe1f9
YZ		 340 *lease = *p;
341 *p += sizeof(**lease);
4ac4c23e
JL		 342
343 if (features == (u64)-1) {
344 if (struct_v >= 2) {
345 ceph_decode_32_safe(p, end, *altname_len, bad);
346 ceph_decode_need(p, end, *altname_len, bad);
347 *altname = *p;
348 *p += *altname_len;
349 } else {
350 *altname = NULL;
351 *altname_len = 0;
352 }
353 }
354 *p = lend;
2f2dc053
SW		 355 return 0;
356bad:
b37fe1f9 357 return -EIO;
2f2dc053
SW		 358}
359
360/*
361 * parse a normal reply, which may contain a (dir+)dentry and/or a
362 * target inode.
363 */
364static int parse_reply_info_trace(void **p, void *end,
14303d20 365 struct ceph_mds_reply_info_parsed *info,
12b4629a 366 u64 features)
2f2dc053
SW		 367{
368 int err;
369
370 if (info->head->is_dentry) {
14303d20 371 err = parse_reply_info_in(p, end, &info->diri, features);
2f2dc053
SW		 372 if (err < 0)
373 goto out_bad;
374
b37fe1f9
YZ		 375 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
376 if (err < 0)
377 goto out_bad;
2f2dc053
SW		 378
379 ceph_decode_32_safe(p, end, info->dname_len, bad);
380 ceph_decode_need(p, end, info->dname_len, bad);
381 info->dname = *p;
382 *p += info->dname_len;
b37fe1f9 383
4ac4c23e
JL		 384 err = parse_reply_info_lease(p, end, &info->dlease, features,
385 &info->altname_len, &info->altname);
b37fe1f9
YZ		 386 if (err < 0)
387 goto out_bad;
2f2dc053
SW		 388 }
389
390 if (info->head->is_target) {
14303d20 391 err = parse_reply_info_in(p, end, &info->targeti, features);
2f2dc053
SW		 392 if (err < 0)
393 goto out_bad;
394 }
395
396 if (unlikely(*p != end))
397 goto bad;
398 return 0;
399
400bad:
401 err = -EIO;
402out_bad:
403 pr_err("problem parsing mds trace %d\n", err);
404 return err;
405}
406
407/*
408 * parse readdir results
409 */
b37fe1f9 410static int parse_reply_info_readdir(void **p, void *end,
3859af9e
XL		 411 struct ceph_mds_request *req,
412 u64 features)
2f2dc053 413{
3859af9e 414 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
38d46409 415 struct ceph_client *cl = req->r_mdsc->fsc->client;
2f2dc053
SW		 416 u32 num, i = 0;
417 int err;
418
b37fe1f9
YZ		 419 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
420 if (err < 0)
421 goto out_bad;
2f2dc053
SW		 422
423 ceph_decode_need(p, end, sizeof(num) + 2, bad);
c89136ea 424 num = ceph_decode_32(p);
956d39d6
YZ		 425 {
426 u16 flags = ceph_decode_16(p);
427 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
428 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
f3c4ebe6 429 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
79162547 430 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
956d39d6 431 }
2f2dc053
SW		 432 if (num == 0)
433 goto done;
434
2a5beea3
YZ		 435 BUG_ON(!info->dir_entries);
436 if ((unsigned long)(info->dir_entries + num) >
437 (unsigned long)info->dir_entries + info->dir_buf_size) {
38d46409 438 pr_err_client(cl, "dir contents are larger than expected\n");
54008399
YZ		 439 WARN_ON(1);
440 goto bad;
441 }
2f2dc053 442
54008399 443 info->dir_nr = num;
2f2dc053 444 while (num) {
af9ffa6d
XL		 445 struct inode *inode = d_inode(req->r_dentry);
446 struct ceph_inode_info *ci = ceph_inode(inode);
2a5beea3 447 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
af9ffa6d
XL		 448 struct fscrypt_str tname = FSTR_INIT(NULL, 0);
449 struct fscrypt_str oname = FSTR_INIT(NULL, 0);
450 struct ceph_fname fname;
451 u32 altname_len, _name_len;
452 u8 *altname, *_name;
453
2f2dc053 454 /* dentry */
af9ffa6d
XL		 455 ceph_decode_32_safe(p, end, _name_len, bad);
456 ceph_decode_need(p, end, _name_len, bad);
457 _name = *p;
458 *p += _name_len;
38d46409 459 doutc(cl, "parsed dir dname '%.*s'\n", _name_len, _name);
af9ffa6d
XL		 460
461 if (info->hash_order)
462 rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
463 _name, _name_len);
2f2dc053 464
b37fe1f9 465 /* dentry lease */
4ac4c23e 466 err = parse_reply_info_lease(p, end, &rde->lease, features,
af9ffa6d 467 &altname_len, &altname);
b37fe1f9
YZ		 468 if (err)
469 goto out_bad;
4ac4c23e 470
af9ffa6d
XL		 471 /*
472 * Try to dencrypt the dentry names and update them
473 * in the ceph_mds_reply_dir_entry struct.
474 */
475 fname.dir = inode;
476 fname.name = _name;
477 fname.name_len = _name_len;
478 fname.ctext = altname;
479 fname.ctext_len = altname_len;
480 /*
481 * The _name_len maybe larger than altname_len, such as
482 * when the human readable name length is in range of
483 * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE),
484 * then the copy in ceph_fname_to_usr will corrupt the
485 * data if there has no encryption key.
486 *
487 * Just set the no_copy flag and then if there has no
488 * encryption key the oname.name will be assigned to
489 * _name always.
490 */
491 fname.no_copy = true;
492 if (altname_len == 0) {
493 /*
494 * Set tname to _name, and this will be used
495 * to do the base64_decode in-place. It's
496 * safe because the decoded string should
497 * always be shorter, which is 3/4 of origin
498 * string.
499 */
500 tname.name = _name;
501
502 /*
503 * Set oname to _name too, and this will be
504 * used to do the dencryption in-place.
505 */
506 oname.name = _name;
507 oname.len = _name_len;
508 } else {
509 /*
510 * This will do the decryption only in-place
511 * from altname cryptext directly.
512 */
513 oname.name = altname;
514 oname.len = altname_len;
515 }
516 rde->is_nokey = false;
517 err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey);
518 if (err) {
38d46409
XL		 519 pr_err_client(cl, "unable to decode %.*s, got %d\n",
520 _name_len, _name, err);
af9ffa6d
XL		 521 goto out_bad;
522 }
523 rde->name = oname.name;
524 rde->name_len = oname.len;
525
2f2dc053 526 /* inode */
2a5beea3 527 err = parse_reply_info_in(p, end, &rde->inode, features);
2f2dc053
SW		 528 if (err < 0)
529 goto out_bad;
8974eebd
YZ		 530 /* ceph_readdir_prepopulate() will update it */
531 rde->offset = 0;
2f2dc053
SW		 532 i++;
533 num--;
534 }
535
536done:
1d3f8723
JL		 537 /* Skip over any unrecognized fields */
538 *p = end;
2f2dc053
SW		 539 return 0;
540
541bad:
542 err = -EIO;
543out_bad:
38d46409 544 pr_err_client(cl, "problem parsing dir contents %d\n", err);
2f2dc053
SW		 545 return err;
546}
547
25933abd
HS		 548/*
549 * parse fcntl F_GETLK results
550 */
551static int parse_reply_info_filelock(void **p, void *end,
14303d20 552 struct ceph_mds_reply_info_parsed *info,
12b4629a 553 u64 features)
25933abd
HS		 554{
555 if (*p + sizeof(*info->filelock_reply) > end)
556 goto bad;
557
558 info->filelock_reply = *p;
25933abd 559
1d3f8723
JL		 560 /* Skip over any unrecognized fields */
561 *p = end;
25933abd 562 return 0;
25933abd
HS		 563bad:
564 return -EIO;
565}
566
d4846487
JL		 567
568#if BITS_PER_LONG == 64
569
570#define DELEGATED_INO_AVAILABLE xa_mk_value(1)
571
572static int ceph_parse_deleg_inos(void **p, void *end,
573 struct ceph_mds_session *s)
574{
38d46409 575 struct ceph_client *cl = s->s_mdsc->fsc->client;
d4846487
JL		 576 u32 sets;
577
578 ceph_decode_32_safe(p, end, sets, bad);
38d46409 579 doutc(cl, "got %u sets of delegated inodes\n", sets);
d4846487 580 while (sets--) {
2ecd0edd 581 u64 start, len;
d4846487
JL		 582
583 ceph_decode_64_safe(p, end, start, bad);
584 ceph_decode_64_safe(p, end, len, bad);
d4f6b31d
JL		 585
586 /* Don't accept a delegation of system inodes */
587 if (start < CEPH_INO_SYSTEM_BASE) {
38d46409
XL		 588 pr_warn_ratelimited_client(cl,
589 "ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
590 start, len);
d4f6b31d
JL		 591 continue;
592 }
d4846487 593 while (len--) {
2ecd0edd 594 int err = xa_insert(&s->s_delegated_inos, start++,
d4846487
JL		 595 DELEGATED_INO_AVAILABLE,
596 GFP_KERNEL);
597 if (!err) {
38d46409 598 doutc(cl, "added delegated inode 0x%llx\n", start - 1);
d4846487 599 } else if (err == -EBUSY) {
38d46409
XL		 600 pr_warn_client(cl,
601 "MDS delegated inode 0x%llx more than once.\n",
d4846487
JL		 602 start - 1);
603 } else {
604 return err;
605 }
606 }
607 }
608 return 0;
609bad:
610 return -EIO;
611}
612
613u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
614{
615 unsigned long ino;
616 void *val;
617
618 xa_for_each(&s->s_delegated_inos, ino, val) {
619 val = xa_erase(&s->s_delegated_inos, ino);
620 if (val == DELEGATED_INO_AVAILABLE)
621 return ino;
622 }
623 return 0;
624}
625
626int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
627{
628 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
629 GFP_KERNEL);
630}
631#else /* BITS_PER_LONG == 64 */
632/*
633 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
634 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
635 * and bottom words?
636 */
637static int ceph_parse_deleg_inos(void **p, void *end,
638 struct ceph_mds_session *s)
639{
640 u32 sets;
641
642 ceph_decode_32_safe(p, end, sets, bad);
643 if (sets)
644 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
645 return 0;
646bad:
647 return -EIO;
648}
649
650u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
651{
652 return 0;
653}
654
655int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
656{
657 return 0;
658}
659#endif /* BITS_PER_LONG == 64 */
660
6e8575fa
SL		 661/*
662 * parse create results
663 */
664static int parse_reply_info_create(void **p, void *end,
665 struct ceph_mds_reply_info_parsed *info,
d4846487 666 u64 features, struct ceph_mds_session *s)
6e8575fa 667{
d4846487
JL		 668 int ret;
669
b37fe1f9
YZ		 670 if (features == (u64)-1 ||
671 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
6e8575fa 672 if (*p == end) {
d4846487 673 /* Malformed reply? */
6e8575fa 674 info->has_create_ino = false;
d4846487 675 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
6e8575fa 676 info->has_create_ino = true;
06a1ad43
JL		 677 /* struct_v, struct_compat, and len */
678 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
d4846487
JL		 679 ceph_decode_64_safe(p, end, info->ino, bad);
680 ret = ceph_parse_deleg_inos(p, end, s);
681 if (ret)
682 return ret;
683 } else {
684 /* legacy */
1d3f8723 685 ceph_decode_64_safe(p, end, info->ino, bad);
d4846487 686 info->has_create_ino = true;
6e8575fa 687 }
1d3f8723
JL		 688 } else {
689 if (*p != end)
690 goto bad;
6e8575fa
SL		 691 }
692
1d3f8723
JL		 693 /* Skip over any unrecognized fields */
694 *p = end;
6e8575fa 695 return 0;
6e8575fa
SL		 696bad:
697 return -EIO;
698}
699
6ddf5f16
MC		 700static int parse_reply_info_getvxattr(void **p, void *end,
701 struct ceph_mds_reply_info_parsed *info,
702 u64 features)
703{
704 u32 value_len;
705
706 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */
707 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */
708 ceph_decode_skip_32(p, end, bad); /* skip payload length */
709
710 ceph_decode_32_safe(p, end, value_len, bad);
711
712 if (value_len == end - *p) {
713 info->xattr_info.xattr_value = *p;
714 info->xattr_info.xattr_value_len = value_len;
715 *p = end;
716 return value_len;
717 }
718bad:
719 return -EIO;
720}
721
25933abd
HS		 722/*
723 * parse extra results
724 */
725static int parse_reply_info_extra(void **p, void *end,
3859af9e 726 struct ceph_mds_request *req,
d4846487 727 u64 features, struct ceph_mds_session *s)
25933abd 728{
3859af9e 729 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
6df8c9d8
JL		 730 u32 op = le32_to_cpu(info->head->op);
731
732 if (op == CEPH_MDS_OP_GETFILELOCK)
14303d20 733 return parse_reply_info_filelock(p, end, info, features);
6df8c9d8 734 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
3859af9e 735 return parse_reply_info_readdir(p, end, req, features);
6df8c9d8 736 else if (op == CEPH_MDS_OP_CREATE)
d4846487 737 return parse_reply_info_create(p, end, info, features, s);
6ddf5f16
MC		 738 else if (op == CEPH_MDS_OP_GETVXATTR)
739 return parse_reply_info_getvxattr(p, end, info, features);
6e8575fa
SL		 740 else
741 return -EIO;
25933abd
HS		 742}
743
2f2dc053
SW		 744/*
745 * parse entire mds reply
746 */
d4846487 747static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
3859af9e 748 struct ceph_mds_request *req, u64 features)
2f2dc053 749{
3859af9e 750 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
38d46409 751 struct ceph_client *cl = s->s_mdsc->fsc->client;
2f2dc053
SW		 752 void *p, *end;
753 u32 len;
754 int err;
755
756 info->head = msg->front.iov_base;
757 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
758 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
759
760 /* trace */
761 ceph_decode_32_safe(&p, end, len, bad);
762 if (len > 0) {
32852a81 763 ceph_decode_need(&p, end, len, bad);
14303d20 764 err = parse_reply_info_trace(&p, p+len, info, features);
2f2dc053
SW		 765 if (err < 0)
766 goto out_bad;
767 }
768
25933abd 769 /* extra */
2f2dc053
SW		 770 ceph_decode_32_safe(&p, end, len, bad);
771 if (len > 0) {
32852a81 772 ceph_decode_need(&p, end, len, bad);
3859af9e 773 err = parse_reply_info_extra(&p, p+len, req, features, s);
2f2dc053
SW		 774 if (err < 0)
775 goto out_bad;
776 }
777
778 /* snap blob */
779 ceph_decode_32_safe(&p, end, len, bad);
780 info->snapblob_len = len;
781 info->snapblob = p;
782 p += len;
783
784 if (p != end)
785 goto bad;
786 return 0;
787
788bad:
789 err = -EIO;
790out_bad:
38d46409 791 pr_err_client(cl, "mds parse_reply err %d\n", err);
8b0da5c5 792 ceph_msg_dump(msg);
2f2dc053
SW		 793 return err;
794}
795
796static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
797{
2d332d5b
JL		 798 int i;
799
800 kfree(info->diri.fscrypt_auth);
801 kfree(info->diri.fscrypt_file);
802 kfree(info->targeti.fscrypt_auth);
803 kfree(info->targeti.fscrypt_file);
2a5beea3 804 if (!info->dir_entries)
54008399 805 return;
2d332d5b
JL		 806
807 for (i = 0; i < info->dir_nr; i++) {
808 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
809
810 kfree(rde->inode.fscrypt_auth);
811 kfree(rde->inode.fscrypt_file);
812 }
2a5beea3 813 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
2f2dc053
SW		 814}
815
4868e537
XL		 816/*
817 * In async unlink case the kclient won't wait for the first reply
818 * from MDS and just drop all the links and unhash the dentry and then
819 * succeeds immediately.
820 *
821 * For any new create/link/rename,etc requests followed by using the
822 * same file names we must wait for the first reply of the inflight
823 * unlink request, or the MDS possibly will fail these following
824 * requests with -EEXIST if the inflight async unlink request was
825 * delayed for some reasons.
826 *
827 * And the worst case is that for the none async openc request it will
828 * successfully open the file if the CDentry hasn't been unlinked yet,
829 * but later the previous delayed async unlink request will remove the
3500000b 830 * CDentry. That means the just created file is possibly deleted later
4868e537
XL		 831 * by accident.
832 *
833 * We need to wait for the inflight async unlink requests to finish
834 * when creating new files/directories by using the same file names.
835 */
836int ceph_wait_on_conflict_unlink(struct dentry *dentry)
837{
5995d90d 838 struct ceph_fs_client *fsc = ceph_sb_to_fs_client(dentry->d_sb);
38d46409 839 struct ceph_client *cl = fsc->client;
4868e537
XL		 840 struct dentry *pdentry = dentry->d_parent;
841 struct dentry *udentry, *found = NULL;
842 struct ceph_dentry_info *di;
843 struct qstr dname;
844 u32 hash = dentry->d_name.hash;
845 int err;
846
847 dname.name = dentry->d_name.name;
848 dname.len = dentry->d_name.len;
849
850 rcu_read_lock();
851 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di,
852 hnode, hash) {
853 udentry = di->dentry;
854
855 spin_lock(&udentry->d_lock);
856 if (udentry->d_name.hash != hash)
857 goto next;
858 if (unlikely(udentry->d_parent != pdentry))
859 goto next;
860 if (!hash_hashed(&di->hnode))
861 goto next;
862
863 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
38d46409
XL		 864 pr_warn_client(cl, "dentry %p:%pd async unlink bit is not set\n",
865 dentry, dentry);
4868e537
XL		 866
867 if (!d_same_name(udentry, pdentry, &dname))
868 goto next;
869
dc32464a 870 found = dget_dlock(udentry);
4868e537 871 spin_unlock(&udentry->d_lock);
4868e537
XL		 872 break;
873next:
874 spin_unlock(&udentry->d_lock);
875 }
876 rcu_read_unlock();
877
878 if (likely(!found))
879 return 0;
880
38d46409
XL		 881 doutc(cl, "dentry %p:%pd conflict with old %p:%pd\n", dentry, dentry,
882 found, found);
4868e537
XL		 883
884 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT,
885 TASK_KILLABLE);
886 dput(found);
887 return err;
888}
889
2f2dc053
SW		 890
891/*
892 * sessions
893 */
a687ecaf 894const char *ceph_session_state_name(int s)
2f2dc053
SW		 895{
896 switch (s) {
897 case CEPH_MDS_SESSION_NEW: return "new";
898 case CEPH_MDS_SESSION_OPENING: return "opening";
899 case CEPH_MDS_SESSION_OPEN: return "open";
900 case CEPH_MDS_SESSION_HUNG: return "hung";
901 case CEPH_MDS_SESSION_CLOSING: return "closing";
4d681c2f 902 case CEPH_MDS_SESSION_CLOSED: return "closed";
44ca18f2 903 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
2f2dc053 904 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
fcff415c 905 case CEPH_MDS_SESSION_REJECTED: return "rejected";
2f2dc053
SW		 906 default: return "???";
907 }
908}
909
5b3248c6 910struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
2f2dc053 911{
9f358999 912 if (refcount_inc_not_zero(&s->s_ref))
2f2dc053 913 return s;
9f358999 914 return NULL;
2f2dc053
SW		 915}
916
917void ceph_put_mds_session(struct ceph_mds_session *s)
918{
7e65624d
JL		 919 if (IS_ERR_OR_NULL(s))
920 return;
921
3997c01d 922 if (refcount_dec_and_test(&s->s_ref)) {
6c4a1915 923 if (s->s_auth.authorizer)
6c1ea260 924 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
88828190 925 WARN_ON(mutex_is_locked(&s->s_mutex));
d4846487 926 xa_destroy(&s->s_delegated_inos);
2f2dc053 927 kfree(s);
4e7a5dcd 928 }
2f2dc053
SW		 929}
930
931/*
932 * called under mdsc->mutex
933 */
934struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
935 int mds)
936{
d37b1d99 937 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 938 return NULL;
5b3248c6 939 return ceph_get_mds_session(mdsc->sessions[mds]);
2f2dc053
SW		 940}
941
942static bool __have_session(struct ceph_mds_client *mdsc, int mds)
943{
98cfda81 944 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
2f2dc053 945 return false;
98cfda81
CX		 946 else
947 return true;
2f2dc053
SW		 948}
949
2600d2dd
SW		 950static int __verify_registered_session(struct ceph_mds_client *mdsc,
951 struct ceph_mds_session *s)
952{
953 if (s->s_mds >= mdsc->max_sessions ||
954 mdsc->sessions[s->s_mds] != s)
955 return -ENOENT;
956 return 0;
957}
958
2f2dc053
SW		 959/*
960 * create+register a new session for given mds.
961 * called under mdsc->mutex.
962 */
963static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
964 int mds)
965{
38d46409 966 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 967 struct ceph_mds_session *s;
968
a68e564a
XL		 969 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
970 return ERR_PTR(-EIO);
971
b38c9eb4 972 if (mds >= mdsc->mdsmap->possible_max_rank)
c338c07c
NY		 973 return ERR_PTR(-EINVAL);
974
2f2dc053 975 s = kzalloc(sizeof(*s), GFP_NOFS);
4736b009
DC		 976 if (!s)
977 return ERR_PTR(-ENOMEM);
47474d0b
CX		 978
979 if (mds >= mdsc->max_sessions) {
980 int newmax = 1 << get_count_order(mds + 1);
981 struct ceph_mds_session **sa;
982
38d46409 983 doutc(cl, "realloc to %d\n", newmax);
47474d0b
CX		 984 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
985 if (!sa)
986 goto fail_realloc;
987 if (mdsc->sessions) {
988 memcpy(sa, mdsc->sessions,
989 mdsc->max_sessions * sizeof(void *));
990 kfree(mdsc->sessions);
991 }
992 mdsc->sessions = sa;
993 mdsc->max_sessions = newmax;
994 }
995
38d46409 996 doutc(cl, "mds%d\n", mds);
2f2dc053
SW		 997 s->s_mdsc = mdsc;
998 s->s_mds = mds;
999 s->s_state = CEPH_MDS_SESSION_NEW;
2f2dc053
SW		 1000 mutex_init(&s->s_mutex);
1001
b7a9e5dd 1002 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
2f2dc053 1003
52d60f8e 1004 atomic_set(&s->s_cap_gen, 1);
1ce208a6 1005 s->s_cap_ttl = jiffies - 1;
d8fb02ab
AE		 1006
1007 spin_lock_init(&s->s_cap_lock);
2f2dc053 1008 INIT_LIST_HEAD(&s->s_caps);
3997c01d 1009 refcount_set(&s->s_ref, 1);
2f2dc053
SW		 1010 INIT_LIST_HEAD(&s->s_waiting);
1011 INIT_LIST_HEAD(&s->s_unsafe);
d4846487 1012 xa_init(&s->s_delegated_inos);
2f2dc053 1013 INIT_LIST_HEAD(&s->s_cap_releases);
e3ec8d68
YZ		 1014 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
1015
1cf03a68 1016 INIT_LIST_HEAD(&s->s_cap_dirty);
2f2dc053 1017 INIT_LIST_HEAD(&s->s_cap_flushing);
2f2dc053 1018
2f2dc053 1019 mdsc->sessions[mds] = s;
86d8f67b 1020 atomic_inc(&mdsc->num_sessions);
3997c01d 1021 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
42ce56e5 1022
b7a9e5dd
SW		 1023 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
1024 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
42ce56e5 1025
2f2dc053 1026 return s;
42ce56e5
SW		 1027
1028fail_realloc:
1029 kfree(s);
1030 return ERR_PTR(-ENOMEM);
2f2dc053
SW		 1031}
1032
1033/*
1034 * called under mdsc->mutex
1035 */
2600d2dd 1036static void __unregister_session(struct ceph_mds_client *mdsc,
42ce56e5 1037 struct ceph_mds_session *s)
2f2dc053 1038{
38d46409 1039 doutc(mdsc->fsc->client, "mds%d %p\n", s->s_mds, s);
2600d2dd 1040 BUG_ON(mdsc->sessions[s->s_mds] != s);
42ce56e5
SW		 1041 mdsc->sessions[s->s_mds] = NULL;
1042 ceph_con_close(&s->s_con);
1043 ceph_put_mds_session(s);
86d8f67b 1044 atomic_dec(&mdsc->num_sessions);
2f2dc053
SW		 1045}
1046
1047/*
1048 * drop session refs in request.
1049 *
1050 * should be last request ref, or hold mdsc->mutex
1051 */
1052static void put_request_session(struct ceph_mds_request *req)
1053{
1054 if (req->r_session) {
1055 ceph_put_mds_session(req->r_session);
1056 req->r_session = NULL;
1057 }
1058}
1059
59b312f3
XL		 1060void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
1061 void (*cb)(struct ceph_mds_session *),
1062 bool check_state)
1063{
1064 int mds;
1065
1066 mutex_lock(&mdsc->mutex);
1067 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
1068 struct ceph_mds_session *s;
1069
1070 s = __ceph_lookup_mds_session(mdsc, mds);
1071 if (!s)
1072 continue;
1073
1074 if (check_state && !check_session_state(s)) {
1075 ceph_put_mds_session(s);
1076 continue;
1077 }
1078
1079 mutex_unlock(&mdsc->mutex);
1080 cb(s);
1081 ceph_put_mds_session(s);
1082 mutex_lock(&mdsc->mutex);
1083 }
1084 mutex_unlock(&mdsc->mutex);
1085}
1086
153c8e6b 1087void ceph_mdsc_release_request(struct kref *kref)
2f2dc053 1088{
153c8e6b
SW		 1089 struct ceph_mds_request *req = container_of(kref,
1090 struct ceph_mds_request,
1091 r_kref);
07045648 1092 ceph_mdsc_release_dir_caps_async(req);
54008399 1093 destroy_reply_info(&req->r_reply_info);
153c8e6b
SW		 1094 if (req->r_request)
1095 ceph_msg_put(req->r_request);
54008399 1096 if (req->r_reply)
153c8e6b 1097 ceph_msg_put(req->r_reply);
153c8e6b 1098 if (req->r_inode) {
41b02e1f 1099 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
23c2c76e 1100 iput(req->r_inode);
153c8e6b 1101 }
9c1c2b35 1102 if (req->r_parent) {
3dd69aab 1103 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
23c2c76e 1104 iput(req->r_parent);
9c1c2b35 1105 }
23c2c76e 1106 iput(req->r_target_inode);
ec9595c0 1107 iput(req->r_new_inode);
153c8e6b
SW		 1108 if (req->r_dentry)
1109 dput(req->r_dentry);
844d87c3
SW		 1110 if (req->r_old_dentry)
1111 dput(req->r_old_dentry);
1112 if (req->r_old_dentry_dir) {
41b02e1f
SW		 1113 /*
1114 * track (and drop pins for) r_old_dentry_dir
1115 * separately, since r_old_dentry's d_parent may have
1116 * changed between the dir mutex being dropped and
1117 * this request being freed.
1118 */
1119 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
1120 CEPH_CAP_PIN);
23c2c76e 1121 iput(req->r_old_dentry_dir);
2f2dc053 1122 }
153c8e6b
SW		 1123 kfree(req->r_path1);
1124 kfree(req->r_path2);
7fe0cdeb 1125 put_cred(req->r_cred);
9c2df227
CB		 1126 if (req->r_mnt_idmap)
1127 mnt_idmap_put(req->r_mnt_idmap);
25e6bae3
YZ		 1128 if (req->r_pagelist)
1129 ceph_pagelist_release(req->r_pagelist);
2d332d5b 1130 kfree(req->r_fscrypt_auth);
24865e75 1131 kfree(req->r_altname);
153c8e6b 1132 put_request_session(req);
37151668 1133 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
428138c9 1134 WARN_ON_ONCE(!list_empty(&req->r_wait));
058daab7 1135 kmem_cache_free(ceph_mds_request_cachep, req);
2f2dc053
SW		 1136}
1137
fcd00b68
ID		 1138DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
1139
2f2dc053
SW		 1140/*
1141 * lookup session, bump ref if found.
1142 *
1143 * called under mdsc->mutex.
1144 */
fcd00b68
ID		 1145static struct ceph_mds_request *
1146lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
2f2dc053
SW		 1147{
1148 struct ceph_mds_request *req;
44ca18f2 1149
fcd00b68
ID		 1150 req = lookup_request(&mdsc->request_tree, tid);
1151 if (req)
1152 ceph_mdsc_get_request(req);
44ca18f2 1153
fcd00b68 1154 return req;
2f2dc053
SW		 1155}
1156
1157/*
1158 * Register an in-flight request, and assign a tid. Link to directory
1159 * are modifying (if any).
1160 *
1161 * Called under mdsc->mutex.
1162 */
1163static void __register_request(struct ceph_mds_client *mdsc,
1164 struct ceph_mds_request *req,
1165 struct inode *dir)
1166{
38d46409 1167 struct ceph_client *cl = mdsc->fsc->client;
e30ee581
ZZ		 1168 int ret = 0;
1169
2f2dc053 1170 req->r_tid = ++mdsc->last_tid;
e30ee581
ZZ		 1171 if (req->r_num_caps) {
1172 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
1173 req->r_num_caps);
1174 if (ret < 0) {
38d46409
XL		 1175 pr_err_client(cl, "%p failed to reserve caps: %d\n",
1176 req, ret);
e30ee581
ZZ		 1177 /* set req->r_err to fail early from __do_request */
1178 req->r_err = ret;
1179 return;
1180 }
1181 }
38d46409 1182 doutc(cl, "%p tid %lld\n", req, req->r_tid);
2f2dc053 1183 ceph_mdsc_get_request(req);
fcd00b68 1184 insert_request(&mdsc->request_tree, req);
2f2dc053 1185
7fe0cdeb 1186 req->r_cred = get_current_cred();
9c2df227
CB		 1187 if (!req->r_mnt_idmap)
1188 req->r_mnt_idmap = &nop_mnt_idmap;
cb4276cc 1189
e8a7b8b1
YZ		 1190 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
1191 mdsc->oldest_tid = req->r_tid;
1192
2f2dc053 1193 if (dir) {
3db0a2fc
JL		 1194 struct ceph_inode_info *ci = ceph_inode(dir);
1195
3b663780 1196 ihold(dir);
2f2dc053 1197 req->r_unsafe_dir = dir;
3db0a2fc
JL		 1198 spin_lock(&ci->i_unsafe_lock);
1199 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
1200 spin_unlock(&ci->i_unsafe_lock);
2f2dc053
SW		 1201 }
1202}
1203
1204static void __unregister_request(struct ceph_mds_client *mdsc,
1205 struct ceph_mds_request *req)
1206{
38d46409 1207 doutc(mdsc->fsc->client, "%p tid %lld\n", req, req->r_tid);
e8a7b8b1 1208
df963ea8
JL		 1209 /* Never leave an unregistered request on an unsafe list! */
1210 list_del_init(&req->r_unsafe_item);
1211
e8a7b8b1
YZ		 1212 if (req->r_tid == mdsc->oldest_tid) {
1213 struct rb_node *p = rb_next(&req->r_node);
1214 mdsc->oldest_tid = 0;
1215 while (p) {
1216 struct ceph_mds_request *next_req =
1217 rb_entry(p, struct ceph_mds_request, r_node);
1218 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
1219 mdsc->oldest_tid = next_req->r_tid;
1220 break;
1221 }
1222 p = rb_next(p);
1223 }
1224 }
1225
fcd00b68 1226 erase_request(&mdsc->request_tree, req);
2f2dc053 1227
3db0a2fc 1228 if (req->r_unsafe_dir) {
2f2dc053 1229 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
2f2dc053
SW		 1230 spin_lock(&ci->i_unsafe_lock);
1231 list_del_init(&req->r_unsafe_dir_item);
1232 spin_unlock(&ci->i_unsafe_lock);
4c06ace8 1233 }
bc2de10d
JL		 1234 if (req->r_target_inode &&
1235 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
68cd5b4b
YZ		 1236 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
1237 spin_lock(&ci->i_unsafe_lock);
1238 list_del_init(&req->r_unsafe_target_item);
1239 spin_unlock(&ci->i_unsafe_lock);
1240 }
3b663780 1241
4c06ace8 1242 if (req->r_unsafe_dir) {
23c2c76e 1243 iput(req->r_unsafe_dir);
3b663780 1244 req->r_unsafe_dir = NULL;
2f2dc053 1245 }
94aa8ae1 1246
fc55d2c9
YZ		 1247 complete_all(&req->r_safe_completion);
1248
94aa8ae1 1249 ceph_mdsc_put_request(req);
2f2dc053
SW		 1250}
1251
30c71233
JL		 1252/*
1253 * Walk back up the dentry tree until we hit a dentry representing a
1254 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
1255 * when calling this) to ensure that the objects won't disappear while we're
1256 * working with them. Once we hit a candidate dentry, we attempt to take a
1257 * reference to it, and return that as the result.
1258 */
f1075480
DC		 1259static struct inode *get_nonsnap_parent(struct dentry *dentry)
1260{
1261 struct inode *inode = NULL;
30c71233
JL		 1262
1263 while (dentry && !IS_ROOT(dentry)) {
1264 inode = d_inode_rcu(dentry);
1265 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
1266 break;
1267 dentry = dentry->d_parent;
1268 }
1269 if (inode)
1270 inode = igrab(inode);
1271 return inode;
1272}
1273
2f2dc053
SW		 1274/*
1275 * Choose mds to send request to next. If there is a hint set in the
1276 * request (e.g., due to a prior forward hint from the mds), use that.
1277 * Otherwise, consult frag tree and/or caps to identify the
1278 * appropriate mds. If all else fails, choose randomly.
1279 *
1280 * Called under mdsc->mutex.
1281 */
1282static int __choose_mds(struct ceph_mds_client *mdsc,
c4853e97
XL		 1283 struct ceph_mds_request *req,
1284 bool *random)
2f2dc053
SW		 1285{
1286 struct inode *inode;
1287 struct ceph_inode_info *ci;
1288 struct ceph_cap *cap;
1289 int mode = req->r_direct_mode;
1290 int mds = -1;
1291 u32 hash = req->r_direct_hash;
bc2de10d 1292 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
38d46409 1293 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 1294
c4853e97
XL		 1295 if (random)
1296 *random = false;
1297
2f2dc053
SW		 1298 /*
1299 * is there a specific mds we should try? ignore hint if we have
1300 * no session and the mds is not up (active or recovering).
1301 */
1302 if (req->r_resend_mds >= 0 &&
1303 (__have_session(mdsc, req->r_resend_mds) ||
1304 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
38d46409 1305 doutc(cl, "using resend_mds mds%d\n", req->r_resend_mds);
2f2dc053
SW		 1306 return req->r_resend_mds;
1307 }
1308
1309 if (mode == USE_RANDOM_MDS)
1310 goto random;
1311
1312 inode = NULL;
1313 if (req->r_inode) {
5d37ca14
YZ		 1314 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1315 inode = req->r_inode;
1316 ihold(inode);
1317 } else {
38f340cc
YZ		 1318 /* req->r_dentry is non-null for LSSNAP request */
1319 rcu_read_lock();
1320 inode = get_nonsnap_parent(req->r_dentry);
1321 rcu_read_unlock();
38d46409
XL		 1322 doutc(cl, "using snapdir's parent %p %llx.%llx\n",
1323 inode, ceph_vinop(inode));
5d37ca14 1324 }
38f340cc 1325 } else if (req->r_dentry) {
d79698da 1326 /* ignore race with rename; old or new d_parent is okay */
30c71233
JL		 1327 struct dentry *parent;
1328 struct inode *dir;
1329
1330 rcu_read_lock();
41883ba8 1331 parent = READ_ONCE(req->r_dentry->d_parent);
3dd69aab 1332 dir = req->r_parent ? : d_inode_rcu(parent);
eb6bb1c5 1333
30c71233
JL		 1334 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1335 /* not this fs or parent went negative */
2b0143b5 1336 inode = d_inode(req->r_dentry);
30c71233
JL		 1337 if (inode)
1338 ihold(inode);
eb6bb1c5
SW		 1339 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1340 /* direct snapped/virtual snapdir requests
1341 * based on parent dir inode */
30c71233 1342 inode = get_nonsnap_parent(parent);
38d46409
XL		 1343 doutc(cl, "using nonsnap parent %p %llx.%llx\n",
1344 inode, ceph_vinop(inode));
ca18bede 1345 } else {
eb6bb1c5 1346 /* dentry target */
2b0143b5 1347 inode = d_inode(req->r_dentry);
ca18bede
YZ		 1348 if (!inode || mode == USE_AUTH_MDS) {
1349 /* dir + name */
30c71233 1350 inode = igrab(dir);
ca18bede
YZ		 1351 hash = ceph_dentry_hash(dir, req->r_dentry);
1352 is_hash = true;
30c71233
JL		 1353 } else {
1354 ihold(inode);
ca18bede 1355 }
2f2dc053 1356 }
30c71233 1357 rcu_read_unlock();
2f2dc053 1358 }
eb6bb1c5 1359
2f2dc053
SW		 1360 if (!inode)
1361 goto random;
38d46409
XL		 1362
1363 doutc(cl, "%p %llx.%llx is_hash=%d (0x%x) mode %d\n", inode,
1364 ceph_vinop(inode), (int)is_hash, hash, mode);
2f2dc053
SW		 1365 ci = ceph_inode(inode);
1366
1367 if (is_hash && S_ISDIR(inode->i_mode)) {
1368 struct ceph_inode_frag frag;
1369 int found;
1370
1371 ceph_choose_frag(ci, hash, &frag, &found);
1372 if (found) {
1373 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1374 u8 r;
1375
1376 /* choose a random replica */
1377 get_random_bytes(&r, 1);
1378 r %= frag.ndist;
1379 mds = frag.dist[r];
38d46409
XL		 1380 doutc(cl, "%p %llx.%llx frag %u mds%d (%d/%d)\n",
1381 inode, ceph_vinop(inode), frag.frag,
1382 mds, (int)r, frag.ndist);
d66bbd44 1383 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f
XL		 1384 CEPH_MDS_STATE_ACTIVE &&
1385 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
30c71233 1386 goto out;
2f2dc053
SW		 1387 }
1388
1389 /* since this file/dir wasn't known to be
1390 * replicated, then we want to look for the
1391 * authoritative mds. */
2f2dc053
SW		 1392 if (frag.mds >= 0) {
1393 /* choose auth mds */
1394 mds = frag.mds;
38d46409
XL		 1395 doutc(cl, "%p %llx.%llx frag %u mds%d (auth)\n",
1396 inode, ceph_vinop(inode), frag.frag, mds);
d66bbd44 1397 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
5d47648f 1398 CEPH_MDS_STATE_ACTIVE) {
224c7b67 1399 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
5d47648f
XL		 1400 mds))
1401 goto out;
1402 }
2f2dc053 1403 }
5d47648f 1404 mode = USE_AUTH_MDS;
2f2dc053
SW		 1405 }
1406 }
1407
be655596 1408 spin_lock(&ci->i_ceph_lock);
2f2dc053
SW		 1409 cap = NULL;
1410 if (mode == USE_AUTH_MDS)
1411 cap = ci->i_auth_cap;
1412 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1413 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1414 if (!cap) {
be655596 1415 spin_unlock(&ci->i_ceph_lock);
23c2c76e 1416 iput(inode);
2f2dc053
SW		 1417 goto random;
1418 }
1419 mds = cap->session->s_mds;
38d46409
XL		 1420 doutc(cl, "%p %llx.%llx mds%d (%scap %p)\n", inode,
1421 ceph_vinop(inode), mds,
1422 cap == ci->i_auth_cap ? "auth " : "", cap);
be655596 1423 spin_unlock(&ci->i_ceph_lock);
30c71233 1424out:
23c2c76e 1425 iput(inode);
2f2dc053
SW		 1426 return mds;
1427
1428random:
c4853e97
XL		 1429 if (random)
1430 *random = true;
1431
2f2dc053 1432 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
38d46409 1433 doutc(cl, "chose random mds%d\n", mds);
2f2dc053
SW		 1434 return mds;
1435}
1436
1437
1438/*
1439 * session messages
1440 */
fba97e80 1441struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
2f2dc053
SW		 1442{
1443 struct ceph_msg *msg;
1444 struct ceph_mds_session_head *h;
1445
b61c2763
SW		 1446 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1447 false);
a79832f2 1448 if (!msg) {
fba97e80
XL		 1449 pr_err("ENOMEM creating session %s msg\n",
1450 ceph_session_op_name(op));
a79832f2 1451 return NULL;
2f2dc053
SW		 1452 }
1453 h = msg->front.iov_base;
1454 h->op = cpu_to_le32(op);
1455 h->seq = cpu_to_le64(seq);
dbd0c8bf
JS		 1456
1457 return msg;
1458}
1459
9ba1e224
XL		 1460static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1461#define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
b682c6d4 1462static int encode_supported_features(void **p, void *end)
342ce182 1463{
9ba1e224 1464 static const size_t count = ARRAY_SIZE(feature_bits);
342ce182
YZ		 1465
1466 if (count > 0) {
1467 size_t i;
9ba1e224 1468 size_t size = FEATURE_BYTES(count);
fea013e0 1469 unsigned long bit;
342ce182 1470
b682c6d4
XL		 1471 if (WARN_ON_ONCE(*p + 4 + size > end))
1472 return -ERANGE;
1473
342ce182
YZ		 1474 ceph_encode_32(p, size);
1475 memset(*p, 0, size);
fea013e0
LH		 1476 for (i = 0; i < count; i++) {
1477 bit = feature_bits[i];
1478 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
1479 }
342ce182
YZ		 1480 *p += size;
1481 } else {
b682c6d4
XL		 1482 if (WARN_ON_ONCE(*p + 4 > end))
1483 return -ERANGE;
1484
342ce182
YZ		 1485 ceph_encode_32(p, 0);
1486 }
b682c6d4
XL		 1487
1488 return 0;
342ce182
YZ		 1489}
1490
3b4168dd
XL		 1491static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1492#define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1493static int encode_metric_spec(void **p, void *end)
1494{
1495 static const size_t count = ARRAY_SIZE(metric_bits);
1496
1497 /* header */
1498 if (WARN_ON_ONCE(*p + 2 > end))
1499 return -ERANGE;
1500
1501 ceph_encode_8(p, 1); /* version */
1502 ceph_encode_8(p, 1); /* compat */
1503
1504 if (count > 0) {
1505 size_t i;
1506 size_t size = METRIC_BYTES(count);
1507
1508 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1509 return -ERANGE;
1510
1511 /* metric spec info length */
1512 ceph_encode_32(p, 4 + size);
1513
1514 /* metric spec */
1515 ceph_encode_32(p, size);
1516 memset(*p, 0, size);
1517 for (i = 0; i < count; i++)
1518 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1519 *p += size;
1520 } else {
1521 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1522 return -ERANGE;
1523
1524 /* metric spec info length */
1525 ceph_encode_32(p, 4);
1526 /* metric spec */
1527 ceph_encode_32(p, 0);
1528 }
1529
1530 return 0;
1531}
1532
dbd0c8bf
JS		 1533/*
1534 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1535 * to include additional client metadata fields.
1536 */
66207de3
XL		 1537static struct ceph_msg *
1538create_session_full_msg(struct ceph_mds_client *mdsc, int op, u64 seq)
dbd0c8bf
JS		 1539{
1540 struct ceph_msg *msg;
1541 struct ceph_mds_session_head *h;
4a756db2 1542 int i;
342ce182 1543 int extra_bytes = 0;
dbd0c8bf
JS		 1544 int metadata_key_count = 0;
1545 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 1546 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
38d46409 1547 struct ceph_client *cl = mdsc->fsc->client;
9ba1e224 1548 size_t size, count;
342ce182 1549 void *p, *end;
b682c6d4 1550 int ret;
dbd0c8bf 1551
a6a5ce4f 1552 const char* metadata[][2] = {
717e6f28
YZ		 1553 {"hostname", mdsc->nodename},
1554 {"kernel_version", init_utsname()->release},
3f384954
YZ		 1555 {"entity_id", opt->name ? : ""},
1556 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 1557 {NULL, NULL}
1558 };
1559
1560 /* Calculate serialized length of metadata */
342ce182 1561 extra_bytes = 4; /* map length */
d37b1d99 1562 for (i = 0; metadata[i][0]; ++i) {
342ce182 1563 extra_bytes += 8 + strlen(metadata[i][0]) +
dbd0c8bf
JS		 1564 strlen(metadata[i][1]);
1565 metadata_key_count++;
1566 }
9ba1e224 1567
342ce182 1568 /* supported feature */
9ba1e224
XL		 1569 size = 0;
1570 count = ARRAY_SIZE(feature_bits);
1571 if (count > 0)
1572 size = FEATURE_BYTES(count);
1573 extra_bytes += 4 + size;
dbd0c8bf 1574
3b4168dd
XL		 1575 /* metric spec */
1576 size = 0;
1577 count = ARRAY_SIZE(metric_bits);
1578 if (count > 0)
1579 size = METRIC_BYTES(count);
1580 extra_bytes += 2 + 4 + 4 + size;
1581
6df89bf2
XL		 1582 /* flags, mds auth caps and oldest_client_tid */
1583 extra_bytes += 4 + 4 + 8;
1584
dbd0c8bf 1585 /* Allocate the message */
342ce182 1586 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
dbd0c8bf
JS		 1587 GFP_NOFS, false);
1588 if (!msg) {
38d46409 1589 pr_err_client(cl, "ENOMEM creating session open msg\n");
b682c6d4 1590 return ERR_PTR(-ENOMEM);
dbd0c8bf 1591 }
342ce182
YZ		 1592 p = msg->front.iov_base;
1593 end = p + msg->front.iov_len;
1594
1595 h = p;
66207de3 1596 h->op = cpu_to_le32(op);
dbd0c8bf
JS		 1597 h->seq = cpu_to_le64(seq);
1598
1599 /*
1600 * Serialize client metadata into waiting buffer space, using
1601 * the format that userspace expects for map<string, string>
7cfa0313 1602 *
6df89bf2 1603 * ClientSession messages with metadata are v7
dbd0c8bf 1604 */
6df89bf2 1605 msg->hdr.version = cpu_to_le16(7);
7cfa0313 1606 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 1607
1608 /* The write pointer, following the session_head structure */
342ce182 1609 p += sizeof(*h);
dbd0c8bf
JS		 1610
1611 /* Number of entries in the map */
1612 ceph_encode_32(&p, metadata_key_count);
1613
1614 /* Two length-prefixed strings for each entry in the map */
d37b1d99 1615 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 1616 size_t const key_len = strlen(metadata[i][0]);
1617 size_t const val_len = strlen(metadata[i][1]);
1618
1619 ceph_encode_32(&p, key_len);
1620 memcpy(p, metadata[i][0], key_len);
1621 p += key_len;
1622 ceph_encode_32(&p, val_len);
1623 memcpy(p, metadata[i][1], val_len);
1624 p += val_len;
1625 }
1626
b682c6d4
XL		 1627 ret = encode_supported_features(&p, end);
1628 if (ret) {
38d46409 1629 pr_err_client(cl, "encode_supported_features failed!\n");
b682c6d4
XL		 1630 ceph_msg_put(msg);
1631 return ERR_PTR(ret);
1632 }
1633
3b4168dd
XL		 1634 ret = encode_metric_spec(&p, end);
1635 if (ret) {
38d46409 1636 pr_err_client(cl, "encode_metric_spec failed!\n");
3b4168dd
XL		 1637 ceph_msg_put(msg);
1638 return ERR_PTR(ret);
1639 }
1640
6df89bf2
XL		 1641 /* version == 5, flags */
1642 ceph_encode_32(&p, 0);
1643
1644 /* version == 6, mds auth caps */
1645 ceph_encode_32(&p, 0);
1646
1647 /* version == 7, oldest_client_tid */
1648 ceph_encode_64(&p, mdsc->oldest_tid);
1649
342ce182
YZ		 1650 msg->front.iov_len = p - msg->front.iov_base;
1651 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1652
2f2dc053
SW		 1653 return msg;
1654}
1655
1656/*
1657 * send session open request.
1658 *
1659 * called under mdsc->mutex
1660 */
1661static int __open_session(struct ceph_mds_client *mdsc,
1662 struct ceph_mds_session *session)
1663{
1664 struct ceph_msg *msg;
1665 int mstate;
1666 int mds = session->s_mds;
2f2dc053 1667
a68e564a
XL		 1668 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1669 return -EIO;
1670
2f2dc053
SW		 1671 /* wait for mds to go active? */
1672 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
38d46409
XL		 1673 doutc(mdsc->fsc->client, "open_session to mds%d (%s)\n", mds,
1674 ceph_mds_state_name(mstate));
2f2dc053
SW		 1675 session->s_state = CEPH_MDS_SESSION_OPENING;
1676 session->s_renew_requested = jiffies;
1677
1678 /* send connect message */
66207de3
XL		 1679 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_OPEN,
1680 session->s_seq);
b682c6d4
XL		 1681 if (IS_ERR(msg))
1682 return PTR_ERR(msg);
2f2dc053 1683 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 1684 return 0;
1685}
1686
ed0552a1
SW		 1687/*
1688 * open sessions for any export targets for the given mds
1689 *
1690 * called under mdsc->mutex
1691 */
5d72d13c
YZ		 1692static struct ceph_mds_session *
1693__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1694{
1695 struct ceph_mds_session *session;
b682c6d4 1696 int ret;
5d72d13c
YZ		 1697
1698 session = __ceph_lookup_mds_session(mdsc, target);
1699 if (!session) {
1700 session = register_session(mdsc, target);
1701 if (IS_ERR(session))
1702 return session;
1703 }
1704 if (session->s_state == CEPH_MDS_SESSION_NEW ||
b682c6d4
XL		 1705 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1706 ret = __open_session(mdsc, session);
1707 if (ret)
1708 return ERR_PTR(ret);
1709 }
5d72d13c
YZ		 1710
1711 return session;
1712}
1713
1714struct ceph_mds_session *
1715ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1716{
1717 struct ceph_mds_session *session;
38d46409 1718 struct ceph_client *cl = mdsc->fsc->client;
5d72d13c 1719
38d46409 1720 doutc(cl, "to mds%d\n", target);
5d72d13c
YZ		 1721
1722 mutex_lock(&mdsc->mutex);
1723 session = __open_export_target_session(mdsc, target);
1724 mutex_unlock(&mdsc->mutex);
1725
1726 return session;
1727}
1728
ed0552a1
SW		 1729static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1730 struct ceph_mds_session *session)
1731{
1732 struct ceph_mds_info *mi;
1733 struct ceph_mds_session *ts;
1734 int i, mds = session->s_mds;
38d46409 1735 struct ceph_client *cl = mdsc->fsc->client;
ed0552a1 1736
b38c9eb4 1737 if (mds >= mdsc->mdsmap->possible_max_rank)
ed0552a1 1738 return;
5d72d13c 1739
ed0552a1 1740 mi = &mdsc->mdsmap->m_info[mds];
38d46409
XL		 1741 doutc(cl, "for mds%d (%d targets)\n", session->s_mds,
1742 mi->num_export_targets);
ed0552a1
SW		 1743
1744 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c 1745 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
7e65624d 1746 ceph_put_mds_session(ts);
ed0552a1
SW		 1747 }
1748}
1749
2f2dc053
SW		 1750/*
1751 * session caps
1752 */
1753
c8a96a31
JL		 1754static void detach_cap_releases(struct ceph_mds_session *session,
1755 struct list_head *target)
2f2dc053 1756{
38d46409
XL		 1757 struct ceph_client *cl = session->s_mdsc->fsc->client;
1758
c8a96a31
JL		 1759 lockdep_assert_held(&session->s_cap_lock);
1760
1761 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1762 session->s_num_cap_releases = 0;
38d46409 1763 doutc(cl, "mds%d\n", session->s_mds);
c8a96a31 1764}
2f2dc053 1765
c8a96a31
JL		 1766static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1767 struct list_head *dispose)
1768{
1769 while (!list_empty(dispose)) {
745a8e3b
YZ		 1770 struct ceph_cap *cap;
1771 /* zero out the in-progress message */
c8a96a31 1772 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1773 list_del(&cap->session_caps);
1774 ceph_put_cap(mdsc, cap);
2f2dc053 1775 }
2f2dc053
SW		 1776}
1777
1c841a96
YZ		 1778static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1779 struct ceph_mds_session *session)
1780{
38d46409 1781 struct ceph_client *cl = mdsc->fsc->client;
1c841a96
YZ		 1782 struct ceph_mds_request *req;
1783 struct rb_node *p;
1784
38d46409 1785 doutc(cl, "mds%d\n", session->s_mds);
1c841a96
YZ		 1786 mutex_lock(&mdsc->mutex);
1787 while (!list_empty(&session->s_unsafe)) {
1788 req = list_first_entry(&session->s_unsafe,
1789 struct ceph_mds_request, r_unsafe_item);
38d46409
XL		 1790 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1791 req->r_tid);
1bd85aa6
JL		 1792 if (req->r_target_inode)
1793 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1794 if (req->r_unsafe_dir)
1795 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1c841a96
YZ		 1796 __unregister_request(mdsc, req);
1797 }
1798 /* zero r_attempts, so kick_requests() will re-send requests */
1799 p = rb_first(&mdsc->request_tree);
1800 while (p) {
1801 req = rb_entry(p, struct ceph_mds_request, r_node);
1802 p = rb_next(p);
1803 if (req->r_session &&
1804 req->r_session->s_mds == session->s_mds)
1805 req->r_attempts = 0;
1806 }
1807 mutex_unlock(&mdsc->mutex);
1808}
1809
2f2dc053 1810/*
f818a736
SW		 1811 * Helper to safely iterate over all caps associated with a session, with
1812 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1813 *
f818a736 1814 * Caller must hold session s_mutex.
2f2dc053 1815 */
f5d77269 1816int ceph_iterate_session_caps(struct ceph_mds_session *session,
aaf67de7
XL		 1817 int (*cb)(struct inode *, int mds, void *),
1818 void *arg)
2f2dc053 1819{
38d46409 1820 struct ceph_client *cl = session->s_mdsc->fsc->client;
7c1332b8
SW		 1821 struct list_head *p;
1822 struct ceph_cap *cap;
1823 struct inode *inode, *last_inode = NULL;
1824 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1825 int ret;
1826
38d46409 1827 doutc(cl, "%p mds%d\n", session, session->s_mds);
2f2dc053 1828 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1829 p = session->s_caps.next;
1830 while (p != &session->s_caps) {
aaf67de7
XL		 1831 int mds;
1832
7c1332b8 1833 cap = list_entry(p, struct ceph_cap, session_caps);
874c8ca1 1834 inode = igrab(&cap->ci->netfs.inode);
7c1332b8
SW		 1835 if (!inode) {
1836 p = p->next;
2f2dc053 1837 continue;
7c1332b8
SW		 1838 }
1839 session->s_cap_iterator = cap;
aaf67de7 1840 mds = cap->mds;
2f2dc053 1841 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1842
1843 if (last_inode) {
23c2c76e 1844 iput(last_inode);
7c1332b8
SW		 1845 last_inode = NULL;
1846 }
1847 if (old_cap) {
37151668 1848 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1849 old_cap = NULL;
1850 }
1851
aaf67de7 1852 ret = cb(inode, mds, arg);
7c1332b8
SW		 1853 last_inode = inode;
1854
2f2dc053 1855 spin_lock(&session->s_cap_lock);
7c1332b8 1856 p = p->next;
d37b1d99 1857 if (!cap->ci) {
38d46409 1858 doutc(cl, "finishing cap %p removal\n", cap);
7c1332b8 1859 BUG_ON(cap->session != session);
745a8e3b 1860 cap->session = NULL;
7c1332b8
SW		 1861 list_del_init(&cap->session_caps);
1862 session->s_nr_caps--;
4f1d756d 1863 atomic64_dec(&session->s_mdsc->metric.total_caps);
e3ec8d68
YZ		 1864 if (cap->queue_release)
1865 __ceph_queue_cap_release(session, cap);
1866 else
745a8e3b 1867 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1868 }
5dacf091
SW		 1869 if (ret < 0)
1870 goto out;
2f2dc053 1871 }
5dacf091
SW		 1872 ret = 0;
1873out:
7c1332b8 1874 session->s_cap_iterator = NULL;
2f2dc053 1875 spin_unlock(&session->s_cap_lock);
7c1332b8 1876
23c2c76e 1877 iput(last_inode);
7c1332b8 1878 if (old_cap)
37151668 1879 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1880
5dacf091 1881 return ret;
2f2dc053
SW		 1882}
1883
aaf67de7 1884static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053
SW		 1885{
1886 struct ceph_inode_info *ci = ceph_inode(inode);
38d46409 1887 struct ceph_client *cl = ceph_inode_to_client(inode);
6c93df5d 1888 bool invalidate = false;
aaf67de7
XL		 1889 struct ceph_cap *cap;
1890 int iputs = 0;
6c99f254 1891
be655596 1892 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 1893 cap = __get_cap_for_mds(ci, mds);
1894 if (cap) {
38d46409
XL		 1895 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1896 cap, ci, &ci->netfs.inode);
aaf67de7
XL		 1897
1898 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1899 }
be655596 1900 spin_unlock(&ci->i_ceph_lock);
77310320 1901
aaf67de7
XL		 1902 if (cap)
1903 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1904 if (invalidate)
1905 ceph_queue_invalidate(inode);
36e6da98 1906 while (iputs--)
a6d37ccd 1907 iput(inode);
2f2dc053
SW		 1908 return 0;
1909}
1910
1911/*
1912 * caller must hold session s_mutex
1913 */
1914static void remove_session_caps(struct ceph_mds_session *session)
1915{
6c93df5d
YZ		 1916 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1917 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1918 LIST_HEAD(dispose);
1919
38d46409 1920 doutc(fsc->client, "on %p\n", session);
f5d77269 1921 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1922
c8799fc4
YZ		 1923 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1924
6f60f889
YZ		 1925 spin_lock(&session->s_cap_lock);
1926 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1927 struct inode *inode;
1928 struct ceph_cap *cap, *prev = NULL;
1929 struct ceph_vino vino;
1930 /*
1931 * iterate_session_caps() skips inodes that are being
1932 * deleted, we need to wait until deletions are complete.
1933 * __wait_on_freeing_inode() is designed for the job,
1934 * but it is not exported, so use lookup inode function
1935 * to access it.
1936 */
1937 while (!list_empty(&session->s_caps)) {
1938 cap = list_entry(session->s_caps.next,
1939 struct ceph_cap, session_caps);
1940 if (cap == prev)
1941 break;
1942 prev = cap;
1943 vino = cap->ci->i_vino;
1944 spin_unlock(&session->s_cap_lock);
1945
ed284c49 1946 inode = ceph_find_inode(sb, vino);
23c2c76e 1947 iput(inode);
6f60f889
YZ		 1948
1949 spin_lock(&session->s_cap_lock);
1950 }
1951 }
745a8e3b
YZ		 1952
1953 // drop cap expires and unlock s_cap_lock
c8a96a31 1954 detach_cap_releases(session, &dispose);
6f60f889 1955
2f2dc053 1956 BUG_ON(session->s_nr_caps > 0);
6c99f254 1957 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1958 spin_unlock(&session->s_cap_lock);
1959 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1960}
1961
d2f8bb27
YZ		 1962enum {
1963 RECONNECT,
1964 RENEWCAPS,
1965 FORCE_RO,
1966};
1967
2f2dc053
SW		 1968/*
1969 * wake up any threads waiting on this session's caps. if the cap is
1970 * old (didn't get renewed on the client reconnect), remove it now.
1971 *
1972 * caller must hold s_mutex.
1973 */
aaf67de7 1974static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
2f2dc053 1975{
0dc2570f 1976 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1977 unsigned long ev = (unsigned long)arg;
0dc2570f 1978
d2f8bb27 1979 if (ev == RECONNECT) {
be655596 1980 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1981 ci->i_wanted_max_size = 0;
1982 ci->i_requested_max_size = 0;
be655596 1983 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1984 } else if (ev == RENEWCAPS) {
aaf67de7
XL		 1985 struct ceph_cap *cap;
1986
1987 spin_lock(&ci->i_ceph_lock);
1988 cap = __get_cap_for_mds(ci, mds);
1989 /* mds did not re-issue stale cap */
1990 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
d2f8bb27 1991 cap->issued = cap->implemented = CEPH_CAP_PIN;
aaf67de7 1992 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1993 } else if (ev == FORCE_RO) {
0dc2570f 1994 }
e5360309 1995 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1996 return 0;
1997}
1998
d2f8bb27 1999static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053 2000{
38d46409
XL		 2001 struct ceph_client *cl = session->s_mdsc->fsc->client;
2002
2003 doutc(cl, "session %p mds%d\n", session, session->s_mds);
f5d77269
JL		 2004 ceph_iterate_session_caps(session, wake_up_session_cb,
2005 (void *)(unsigned long)ev);
2f2dc053
SW		 2006}
2007
2008/*
2009 * Send periodic message to MDS renewing all currently held caps. The
2010 * ack will reset the expiration for all caps from this session.
2011 *
2012 * caller holds s_mutex
2013 */
2014static int send_renew_caps(struct ceph_mds_client *mdsc,
2015 struct ceph_mds_session *session)
2016{
38d46409 2017 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2018 struct ceph_msg *msg;
2019 int state;
2020
2021 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2022 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
38d46409 2023 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
e4cb4cb8 2024 session->s_renew_requested = jiffies;
2f2dc053
SW		 2025
2026 /* do not try to renew caps until a recovering mds has reconnected
2027 * with its clients. */
2028 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2029 if (state < CEPH_MDS_STATE_RECONNECT) {
38d46409
XL		 2030 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2031 ceph_mds_state_name(state));
2f2dc053
SW		 2032 return 0;
2033 }
2034
38d46409
XL		 2035 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2036 ceph_mds_state_name(state));
6df89bf2 2037 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS,
fba97e80 2038 ++session->s_renew_seq);
6df89bf2
XL		 2039 if (IS_ERR(msg))
2040 return PTR_ERR(msg);
2f2dc053
SW		 2041 ceph_con_send(&session->s_con, msg);
2042 return 0;
2043}
2044
186e4f7a
YZ		 2045static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2046 struct ceph_mds_session *session, u64 seq)
2047{
38d46409 2048 struct ceph_client *cl = mdsc->fsc->client;
186e4f7a
YZ		 2049 struct ceph_msg *msg;
2050
38d46409
XL		 2051 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2052 ceph_session_state_name(session->s_state), seq);
fba97e80 2053 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
186e4f7a
YZ		 2054 if (!msg)
2055 return -ENOMEM;
2056 ceph_con_send(&session->s_con, msg);
2057 return 0;
2058}
2059
2060
2f2dc053
SW		 2061/*
2062 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 2063 *
2064 * Called under session->s_mutex
2f2dc053
SW		 2065 */
2066static void renewed_caps(struct ceph_mds_client *mdsc,
2067 struct ceph_mds_session *session, int is_renew)
2068{
38d46409 2069 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2070 int was_stale;
2071 int wake = 0;
2072
2073 spin_lock(&session->s_cap_lock);
1ce208a6 2074 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 2075
2076 session->s_cap_ttl = session->s_renew_requested +
2077 mdsc->mdsmap->m_session_timeout*HZ;
2078
2079 if (was_stale) {
2080 if (time_before(jiffies, session->s_cap_ttl)) {
38d46409
XL		 2081 pr_info_client(cl, "mds%d caps renewed\n",
2082 session->s_mds);
2f2dc053
SW		 2083 wake = 1;
2084 } else {
38d46409
XL		 2085 pr_info_client(cl, "mds%d caps still stale\n",
2086 session->s_mds);
2f2dc053
SW		 2087 }
2088 }
38d46409
XL		 2089 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2090 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2091 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2f2dc053
SW		 2092 spin_unlock(&session->s_cap_lock);
2093
2094 if (wake)
d2f8bb27 2095 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 2096}
2097
2098/*
2099 * send a session close request
2100 */
3e699bd8 2101static int request_close_session(struct ceph_mds_session *session)
2f2dc053 2102{
38d46409 2103 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053 2104 struct ceph_msg *msg;
2f2dc053 2105
38d46409
XL		 2106 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2107 ceph_session_state_name(session->s_state), session->s_seq);
fba97e80
XL		 2108 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2109 session->s_seq);
a79832f2
SW		 2110 if (!msg)
2111 return -ENOMEM;
2112 ceph_con_send(&session->s_con, msg);
fcff415c 2113 return 1;
2f2dc053
SW		 2114}
2115
2116/*
2117 * Called with s_mutex held.
2118 */
2119static int __close_session(struct ceph_mds_client *mdsc,
2120 struct ceph_mds_session *session)
2121{
2122 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2123 return 0;
2124 session->s_state = CEPH_MDS_SESSION_CLOSING;
3e699bd8 2125 return request_close_session(session);
2f2dc053
SW		 2126}
2127
040d7860
YZ		 2128static bool drop_negative_children(struct dentry *dentry)
2129{
2130 struct dentry *child;
2131 bool all_negative = true;
2132
2133 if (!d_is_dir(dentry))
2134 goto out;
2135
2136 spin_lock(&dentry->d_lock);
da549bdd 2137 hlist_for_each_entry(child, &dentry->d_children, d_sib) {
040d7860
YZ		 2138 if (d_really_is_positive(child)) {
2139 all_negative = false;
2140 break;
2141 }
2142 }
2143 spin_unlock(&dentry->d_lock);
2144
2145 if (all_negative)
2146 shrink_dcache_parent(dentry);
2147out:
2148 return all_negative;
2149}
2150
2f2dc053
SW		 2151/*
2152 * Trim old(er) caps.
2153 *
2154 * Because we can't cache an inode without one or more caps, we do
2155 * this indirectly: if a cap is unused, we prune its aliases, at which
2156 * point the inode will hopefully get dropped to.
2157 *
2158 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2159 * memory pressure from the MDS, though, so it needn't be perfect.
2160 */
aaf67de7 2161static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 2162{
197b7d79 2163 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 2164 struct ceph_client *cl = mdsc->fsc->client;
533a2818 2165 int *remaining = arg;
2f2dc053 2166 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 2167 int used, wanted, oissued, mine;
aaf67de7 2168 struct ceph_cap *cap;
2f2dc053 2169
533a2818 2170 if (*remaining <= 0)
2f2dc053
SW		 2171 return -1;
2172
be655596 2173 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 2174 cap = __get_cap_for_mds(ci, mds);
2175 if (!cap) {
2176 spin_unlock(&ci->i_ceph_lock);
2177 return 0;
2178 }
2f2dc053
SW		 2179 mine = cap->issued | cap->implemented;
2180 used = __ceph_caps_used(ci);
979abfdd 2181 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 2182 oissued = __ceph_caps_issued_other(ci, cap);
2183
38d46409
XL		 2184 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2185 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2186 ceph_cap_string(oissued), ceph_cap_string(used),
2187 ceph_cap_string(wanted));
979abfdd 2188 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 2189 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2190 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 2191 goto out;
2192 if ((used | wanted) & CEPH_CAP_ANY_WR)
2193 goto out;
89aa5930
YZ		 2194 /* Note: it's possible that i_filelock_ref becomes non-zero
2195 * after dropping auth caps. It doesn't hurt because reply
2196 * of lock mds request will re-add auth caps. */
2197 if (atomic_read(&ci->i_filelock_ref) > 0)
2198 goto out;
979abfdd 2199 }
5e804ac4
YZ		 2200 /* The inode has cached pages, but it's no longer used.
2201 * we can safely drop it */
525d15e8
YZ		 2202 if (S_ISREG(inode->i_mode) &&
2203 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
5e804ac4
YZ		 2204 !(oissued & CEPH_CAP_FILE_CACHE)) {
2205 used = 0;
2206 oissued = 0;
2207 }
979abfdd 2208 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 2209 goto out; /* we need these caps */
2210
2f2dc053
SW		 2211 if (oissued) {
2212 /* we aren't the only cap.. just remove us */
197b7d79 2213 ceph_remove_cap(mdsc, cap, true);
533a2818 2214 (*remaining)--;
2f2dc053 2215 } else {
040d7860 2216 struct dentry *dentry;
5e804ac4 2217 /* try dropping referring dentries */
be655596 2218 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 2219 dentry = d_find_any_alias(inode);
2220 if (dentry && drop_negative_children(dentry)) {
2221 int count;
2222 dput(dentry);
2223 d_prune_aliases(inode);
2224 count = atomic_read(&inode->i_count);
2225 if (count == 1)
533a2818 2226 (*remaining)--;
38d46409
XL		 2227 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2228 inode, ceph_vinop(inode), cap, count);
040d7860
YZ		 2229 } else {
2230 dput(dentry);
2231 }
2f2dc053
SW		 2232 return 0;
2233 }
2234
2235out:
be655596 2236 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 2237 return 0;
2238}
2239
2240/*
2241 * Trim session cap count down to some max number.
2242 */
e30ee581
ZZ		 2243int ceph_trim_caps(struct ceph_mds_client *mdsc,
2244 struct ceph_mds_session *session,
2245 int max_caps)
2f2dc053 2246{
38d46409 2247 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2248 int trim_caps = session->s_nr_caps - max_caps;
2249
38d46409
XL		 2250 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2251 session->s_nr_caps, max_caps, trim_caps);
2f2dc053 2252 if (trim_caps > 0) {
533a2818
JL		 2253 int remaining = trim_caps;
2254
2255 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
38d46409
XL		 2256 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2257 session->s_mds, session->s_nr_caps, max_caps,
2258 trim_caps - remaining);
2f2dc053 2259 }
a56371d9 2260
c085f6ca 2261 ceph_flush_session_cap_releases(mdsc, session);
2f2dc053
SW		 2262 return 0;
2263}
2264
8310b089
YZ		 2265static int check_caps_flush(struct ceph_mds_client *mdsc,
2266 u64 want_flush_tid)
2267{
38d46409 2268 struct ceph_client *cl = mdsc->fsc->client;
8310b089
YZ		 2269 int ret = 1;
2270
2271 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 2272 if (!list_empty(&mdsc->cap_flush_list)) {
2273 struct ceph_cap_flush *cf =
2274 list_first_entry(&mdsc->cap_flush_list,
2275 struct ceph_cap_flush, g_list);
2276 if (cf->tid <= want_flush_tid) {
38d46409
XL		 2277 doutc(cl, "still flushing tid %llu <= %llu\n",
2278 cf->tid, want_flush_tid);
e4500b5e
YZ		 2279 ret = 0;
2280 }
8310b089
YZ		 2281 }
2282 spin_unlock(&mdsc->cap_dirty_lock);
2283 return ret;
d3383a8e
YZ		 2284}
2285
2f2dc053
SW		 2286/*
2287 * flush all dirty inode data to disk.
2288 *
8310b089 2289 * returns true if we've flushed through want_flush_tid
2f2dc053 2290 */
affbc19a 2291static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 2292 u64 want_flush_tid)
2f2dc053 2293{
38d46409
XL		 2294 struct ceph_client *cl = mdsc->fsc->client;
2295
2296 doutc(cl, "want %llu\n", want_flush_tid);
8310b089
YZ		 2297
2298 wait_event(mdsc->cap_flushing_wq,
2299 check_caps_flush(mdsc, want_flush_tid));
2300
38d46409 2301 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 2302}
2303
2304/*
2305 * called under s_mutex
2306 */
e3ec8d68
YZ		 2307static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2308 struct ceph_mds_session *session)
2f2dc053 2309{
38d46409 2310 struct ceph_client *cl = mdsc->fsc->client;
745a8e3b
YZ		 2311 struct ceph_msg *msg = NULL;
2312 struct ceph_mds_cap_release *head;
2313 struct ceph_mds_cap_item *item;
92475f05 2314 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 2315 struct ceph_cap *cap;
2316 LIST_HEAD(tmp_list);
2317 int num_cap_releases;
92475f05
JL		 2318 __le32 barrier, *cap_barrier;
2319
2320 down_read(&osdc->lock);
2321 barrier = cpu_to_le32(osdc->epoch_barrier);
2322 up_read(&osdc->lock);
2f2dc053 2323
0f8605f2 2324 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 2325again:
2326 list_splice_init(&session->s_cap_releases, &tmp_list);
2327 num_cap_releases = session->s_num_cap_releases;
2328 session->s_num_cap_releases = 0;
2f2dc053 2329 spin_unlock(&session->s_cap_lock);
e01a5946 2330
745a8e3b
YZ		 2331 while (!list_empty(&tmp_list)) {
2332 if (!msg) {
2333 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 2334 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 2335 if (!msg)
2336 goto out_err;
2337 head = msg->front.iov_base;
2338 head->num = cpu_to_le32(0);
2339 msg->front.iov_len = sizeof(*head);
92475f05
JL		 2340
2341 msg->hdr.version = cpu_to_le16(2);
2342 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 2343 }
92475f05 2344
745a8e3b
YZ		 2345 cap = list_first_entry(&tmp_list, struct ceph_cap,
2346 session_caps);
2347 list_del(&cap->session_caps);
2348 num_cap_releases--;
e01a5946 2349
00bd8edb 2350 head = msg->front.iov_base;
4198aba4
JL		 2351 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2352 &head->num);
745a8e3b
YZ		 2353 item = msg->front.iov_base + msg->front.iov_len;
2354 item->ino = cpu_to_le64(cap->cap_ino);
2355 item->cap_id = cpu_to_le64(cap->cap_id);
2356 item->migrate_seq = cpu_to_le32(cap->mseq);
50f42c48 2357 item->issue_seq = cpu_to_le32(cap->issue_seq);
745a8e3b
YZ		 2358 msg->front.iov_len += sizeof(*item);
2359
2360 ceph_put_cap(mdsc, cap);
2361
2362 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 2363 // Append cap_barrier field
2364 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2365 *cap_barrier = barrier;
2366 msg->front.iov_len += sizeof(*cap_barrier);
2367
745a8e3b 2368 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2369 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b
YZ		 2370 ceph_con_send(&session->s_con, msg);
2371 msg = NULL;
2372 }
00bd8edb 2373 }
e01a5946 2374
745a8e3b 2375 BUG_ON(num_cap_releases != 0);
e01a5946 2376
745a8e3b
YZ		 2377 spin_lock(&session->s_cap_lock);
2378 if (!list_empty(&session->s_cap_releases))
2379 goto again;
2380 spin_unlock(&session->s_cap_lock);
2381
2382 if (msg) {
92475f05
JL		 2383 // Append cap_barrier field
2384 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2385 *cap_barrier = barrier;
2386 msg->front.iov_len += sizeof(*cap_barrier);
2387
745a8e3b 2388 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2389 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b 2390 ceph_con_send(&session->s_con, msg);
e01a5946 2391 }
745a8e3b
YZ		 2392 return;
2393out_err:
38d46409
XL		 2394 pr_err_client(cl, "mds%d, failed to allocate message\n",
2395 session->s_mds);
745a8e3b
YZ		 2396 spin_lock(&session->s_cap_lock);
2397 list_splice(&tmp_list, &session->s_cap_releases);
2398 session->s_num_cap_releases += num_cap_releases;
2399 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 2400}
2401
e3ec8d68
YZ		 2402static void ceph_cap_release_work(struct work_struct *work)
2403{
2404 struct ceph_mds_session *session =
2405 container_of(work, struct ceph_mds_session, s_cap_release_work);
2406
2407 mutex_lock(&session->s_mutex);
2408 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2409 session->s_state == CEPH_MDS_SESSION_HUNG)
2410 ceph_send_cap_releases(session->s_mdsc, session);
2411 mutex_unlock(&session->s_mutex);
2412 ceph_put_mds_session(session);
2413}
2414
c085f6ca 2415void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
e3ec8d68
YZ		 2416 struct ceph_mds_session *session)
2417{
38d46409 2418 struct ceph_client *cl = mdsc->fsc->client;
e3ec8d68
YZ		 2419 if (mdsc->stopping)
2420 return;
2421
5b3248c6 2422 ceph_get_mds_session(session);
e3ec8d68
YZ		 2423 if (queue_work(mdsc->fsc->cap_wq,
2424 &session->s_cap_release_work)) {
38d46409 2425 doutc(cl, "cap release work queued\n");
e3ec8d68
YZ		 2426 } else {
2427 ceph_put_mds_session(session);
38d46409 2428 doutc(cl, "failed to queue cap release work\n");
e3ec8d68
YZ		 2429 }
2430}
2431
2432/*
2433 * caller holds session->s_cap_lock
2434 */
2435void __ceph_queue_cap_release(struct ceph_mds_session *session,
2436 struct ceph_cap *cap)
2437{
2438 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2439 session->s_num_cap_releases++;
2440
2441 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
c085f6ca 2442 ceph_flush_session_cap_releases(session->s_mdsc, session);
e3ec8d68
YZ		 2443}
2444
37c4efc1
YZ		 2445static void ceph_cap_reclaim_work(struct work_struct *work)
2446{
2447 struct ceph_mds_client *mdsc =
2448 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2449 int ret = ceph_trim_dentries(mdsc);
2450 if (ret == -EAGAIN)
2451 ceph_queue_cap_reclaim_work(mdsc);
2452}
2453
2454void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2455{
38d46409 2456 struct ceph_client *cl = mdsc->fsc->client;
37c4efc1
YZ		 2457 if (mdsc->stopping)
2458 return;
2459
2460 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
38d46409 2461 doutc(cl, "caps reclaim work queued\n");
37c4efc1 2462 } else {
38d46409 2463 doutc(cl, "failed to queue caps release work\n");
37c4efc1
YZ		 2464 }
2465}
2466
fe33032d
YZ		 2467void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2468{
2469 int val;
2470 if (!nr)
2471 return;
2472 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
bba1560b 2473 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
fe33032d
YZ		 2474 atomic_set(&mdsc->cap_reclaim_pending, 0);
2475 ceph_queue_cap_reclaim_work(mdsc);
2476 }
2477}
2478
dbc347ef
XL		 2479void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc)
2480{
2481 struct ceph_client *cl = mdsc->fsc->client;
2482 if (mdsc->stopping)
2483 return;
2484
2485 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) {
2486 doutc(cl, "caps unlink work queued\n");
2487 } else {
2488 doutc(cl, "failed to queue caps unlink work\n");
2489 }
2490}
2491
2492static void ceph_cap_unlink_work(struct work_struct *work)
2493{
2494 struct ceph_mds_client *mdsc =
2495 container_of(work, struct ceph_mds_client, cap_unlink_work);
2496 struct ceph_client *cl = mdsc->fsc->client;
2497
2498 doutc(cl, "begin\n");
17f8dc2d 2499 spin_lock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2500 while (!list_empty(&mdsc->cap_unlink_delay_list)) {
2501 struct ceph_inode_info *ci;
2502 struct inode *inode;
2503
2504 ci = list_first_entry(&mdsc->cap_unlink_delay_list,
2505 struct ceph_inode_info,
2506 i_cap_delay_list);
2507 list_del_init(&ci->i_cap_delay_list);
2508
2509 inode = igrab(&ci->netfs.inode);
2510 if (inode) {
17f8dc2d 2511 spin_unlock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2512 doutc(cl, "on %p %llx.%llx\n", inode,
2513 ceph_vinop(inode));
2514 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2515 iput(inode);
17f8dc2d 2516 spin_lock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2517 }
2518 }
17f8dc2d 2519 spin_unlock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2520 doutc(cl, "done\n");
2521}
2522
2f2dc053
SW		 2523/*
2524 * requests
2525 */
2526
54008399
YZ		 2527int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2528 struct inode *dir)
2529{
2530 struct ceph_inode_info *ci = ceph_inode(dir);
2531 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2532 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2533 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
ad8c28a9
JL		 2534 unsigned int num_entries;
2535 int order;
54008399
YZ		 2536
2537 spin_lock(&ci->i_ceph_lock);
2538 num_entries = ci->i_files + ci->i_subdirs;
2539 spin_unlock(&ci->i_ceph_lock);
ad8c28a9 2540 num_entries = max(num_entries, 1U);
54008399
YZ		 2541 num_entries = min(num_entries, opt->max_readdir);
2542
2543 order = get_order(size * num_entries);
2544 while (order >= 0) {
2a5beea3 2545 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2941bf53
XL		 2546 __GFP_NOWARN |
2547 __GFP_ZERO,
2a5beea3
YZ		 2548 order);
2549 if (rinfo->dir_entries)
54008399
YZ		 2550 break;
2551 order--;
2552 }
2a5beea3 2553 if (!rinfo->dir_entries)
54008399
YZ		 2554 return -ENOMEM;
2555
2556 num_entries = (PAGE_SIZE << order) / size;
2557 num_entries = min(num_entries, opt->max_readdir);
2558
2559 rinfo->dir_buf_size = PAGE_SIZE << order;
2560 req->r_num_caps = num_entries + 1;
2561 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2562 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2563 return 0;
2564}
2565
2f2dc053
SW		 2566/*
2567 * Create an mds request.
2568 */
2569struct ceph_mds_request *
2570ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2571{
058daab7 2572 struct ceph_mds_request *req;
2f2dc053 2573
058daab7 2574 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2f2dc053
SW		 2575 if (!req)
2576 return ERR_PTR(-ENOMEM);
2577
b4556396 2578 mutex_init(&req->r_fill_mutex);
37151668 2579 req->r_mdsc = mdsc;
2f2dc053 2580 req->r_started = jiffies;
70c94820 2581 req->r_start_latency = ktime_get();
2f2dc053
SW		 2582 req->r_resend_mds = -1;
2583 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2584 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2585 req->r_fmode = -1;
6eb06c46 2586 req->r_feature_needed = -1;
153c8e6b 2587 kref_init(&req->r_kref);
fcd00b68 2588 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2589 INIT_LIST_HEAD(&req->r_wait);
2590 init_completion(&req->r_completion);
2591 init_completion(&req->r_safe_completion);
2592 INIT_LIST_HEAD(&req->r_unsafe_item);
2593
668c9a61 2594 ktime_get_coarse_real_ts64(&req->r_stamp);
b8e69066 2595
2f2dc053
SW		 2596 req->r_op = op;
2597 req->r_direct_mode = mode;
2598 return req;
2599}
2600
2601/*
44ca18f2 2602 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2603 *
2604 * called under mdsc->mutex.
2605 */
44ca18f2
SW		 2606static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2607{
2608 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2609 return NULL;
2610 return rb_entry(rb_first(&mdsc->request_tree),
2611 struct ceph_mds_request, r_node);
2612}
2613
e8a7b8b1 2614static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2615{
e8a7b8b1 2616 return mdsc->oldest_tid;
2f2dc053
SW		 2617}
2618
24865e75
JL		 2619#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2620static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2621{
2622 struct inode *dir = req->r_parent;
2623 struct dentry *dentry = req->r_dentry;
541795cb 2624 const struct qstr *name = req->r_dname;
24865e75
JL		 2625 u8 *cryptbuf = NULL;
2626 u32 len = 0;
2627 int ret = 0;
2628
2629 /* only encode if we have parent and dentry */
2630 if (!dir || !dentry)
2631 goto success;
2632
2633 /* No-op unless this is encrypted */
2634 if (!IS_ENCRYPTED(dir))
2635 goto success;
2636
14e034a6
LH		 2637 ret = ceph_fscrypt_prepare_readdir(dir);
2638 if (ret < 0)
24865e75
JL		 2639 return ERR_PTR(ret);
2640
2641 /* No key? Just ignore it. */
2642 if (!fscrypt_has_encryption_key(dir))
2643 goto success;
2644
541795cb
AV		 2645 if (!name)
2646 name = &dentry->d_name;
2647
2648 if (!fscrypt_fname_encrypted_size(dir, name->len, NAME_MAX, &len)) {
24865e75
JL		 2649 WARN_ON_ONCE(1);
2650 return ERR_PTR(-ENAMETOOLONG);
2651 }
2652
2653 /* No need to append altname if name is short enough */
2654 if (len <= CEPH_NOHASH_NAME_MAX) {
2655 len = 0;
2656 goto success;
2657 }
2658
2659 cryptbuf = kmalloc(len, GFP_KERNEL);
2660 if (!cryptbuf)
2661 return ERR_PTR(-ENOMEM);
2662
541795cb 2663 ret = fscrypt_fname_encrypt(dir, name, cryptbuf, len);
24865e75
JL		 2664 if (ret) {
2665 kfree(cryptbuf);
2666 return ERR_PTR(ret);
2667 }
2668success:
2669 *plen = len;
2670 return cryptbuf;
2671}
2672#else
2673static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2674{
2675 *plen = 0;
2676 return NULL;
2677}
2678#endif
2679
3fd945a7
JL		 2680/**
2681 * ceph_mdsc_build_path - build a path string to a given dentry
197b7d79 2682 * @mdsc: mds client
3fd945a7
JL		 2683 * @dentry: dentry to which path should be built
2684 * @plen: returned length of string
2685 * @pbase: returned base inode number
2686 * @for_wire: is this path going to be sent to the MDS?
2687 *
2688 * Build a string that represents the path to the dentry. This is mostly called
2689 * for two different purposes:
2690 *
2691 * 1) we need to build a path string to send to the MDS (for_wire == true)
2692 * 2) we need a path string for local presentation (e.g. debugfs)
2693 * (for_wire == false)
2f2dc053 2694 *
3fd945a7
JL		 2695 * The path is built in reverse, starting with the dentry. Walk back up toward
2696 * the root, building the path until the first non-snapped inode is reached
2697 * (for_wire) or the root inode is reached (!for_wire).
2f2dc053
SW		 2698 *
2699 * Encode hidden .snap dirs as a double /, i.e.
2700 * foo/.snap/bar -> foo//bar
2701 */
197b7d79
XL		 2702char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2703 int *plen, u64 *pbase, int for_wire)
2f2dc053 2704{
38d46409 2705 struct ceph_client *cl = mdsc->fsc->client;
4c793d4c
JL		 2706 struct dentry *cur;
2707 struct inode *inode;
2f2dc053 2708 char *path;
f77f21bb 2709 int pos;
1b71fe2e 2710 unsigned seq;
69a10fb3 2711 u64 base;
2f2dc053 2712
d37b1d99 2713 if (!dentry)
2f2dc053
SW		 2714 return ERR_PTR(-EINVAL);
2715
f77f21bb 2716 path = __getname();
d37b1d99 2717 if (!path)
2f2dc053 2718 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2719retry:
2720 pos = PATH_MAX - 1;
2721 path[pos] = '\0';
2722
2723 seq = read_seqbegin(&rename_lock);
4c793d4c 2724 cur = dget(dentry);
f77f21bb 2725 for (;;) {
3fd945a7 2726 struct dentry *parent;
2f2dc053 2727
4c793d4c
JL		 2728 spin_lock(&cur->d_lock);
2729 inode = d_inode(cur);
2f2dc053 2730 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
38d46409 2731 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
3fd945a7
JL		 2732 spin_unlock(&cur->d_lock);
2733 parent = dget_parent(cur);
2734 } else if (for_wire && inode && dentry != cur &&
2f2dc053 2735 ceph_snap(inode) == CEPH_NOSNAP) {
4c793d4c 2736 spin_unlock(&cur->d_lock);
d6b8bd67 2737 pos++; /* get rid of any prepended '/' */
2f2dc053 2738 break;
3fd945a7 2739 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
4c793d4c 2740 pos -= cur->d_name.len;
1b71fe2e 2741 if (pos < 0) {
4c793d4c 2742 spin_unlock(&cur->d_lock);
2f2dc053 2743 break;
1b71fe2e 2744 }
4c793d4c 2745 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
3fd945a7
JL		 2746 spin_unlock(&cur->d_lock);
2747 parent = dget_parent(cur);
2748 } else {
2749 int len, ret;
2750 char buf[NAME_MAX];
2751
2752 /*
2753 * Proactively copy name into buf, in case we need to
2754 * present it as-is.
2755 */
2756 memcpy(buf, cur->d_name.name, cur->d_name.len);
2757 len = cur->d_name.len;
2758 spin_unlock(&cur->d_lock);
2759 parent = dget_parent(cur);
2760
14e034a6 2761 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
3fd945a7
JL		 2762 if (ret < 0) {
2763 dput(parent);
2764 dput(cur);
2765 return ERR_PTR(ret);
2766 }
2767
2768 if (fscrypt_has_encryption_key(d_inode(parent))) {
2769 len = ceph_encode_encrypted_fname(d_inode(parent),
2770 cur, buf);
2771 if (len < 0) {
2772 dput(parent);
2773 dput(cur);
2774 return ERR_PTR(len);
2775 }
2776 }
2777 pos -= len;
2778 if (pos < 0) {
2779 dput(parent);
2780 break;
2781 }
2782 memcpy(path + pos, buf, len);
2f2dc053 2783 }
3fd945a7
JL		 2784 dput(cur);
2785 cur = parent;
f77f21bb
JL		 2786
2787 /* Are we at the root? */
4c793d4c 2788 if (IS_ROOT(cur))
f77f21bb
JL		 2789 break;
2790
2791 /* Are we out of buffer? */
2792 if (--pos < 0)
2793 break;
2794
2795 path[pos] = '/';
2f2dc053 2796 }
4c793d4c
JL		 2797 inode = d_inode(cur);
2798 base = inode ? ceph_ino(inode) : 0;
2799 dput(cur);
f5946bcc
JL		 2800
2801 if (read_seqretry(&rename_lock, seq))
2802 goto retry;
2803
2804 if (pos < 0) {
2805 /*
550f7ca9
MK		 2806 * The path is longer than PATH_MAX and this function
2807 * cannot ever succeed. Creating paths that long is
2808 * possible with Ceph, but Linux cannot use them.
f5946bcc 2809 */
550f7ca9 2810 return ERR_PTR(-ENAMETOOLONG);
2f2dc053
SW		 2811 }
2812
69a10fb3 2813 *pbase = base;
f77f21bb 2814 *plen = PATH_MAX - 1 - pos;
38d46409
XL		 2815 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2816 base, *plen, path + pos);
f77f21bb 2817 return path + pos;
2f2dc053
SW		 2818}
2819
197b7d79
XL		 2820static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2821 struct inode *dir, const char **ppath, int *ppathlen,
2822 u64 *pino, bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2823{
2824 char *path;
2825
c6b0b656 2826 rcu_read_lock();
fd36a717
JL		 2827 if (!dir)
2828 dir = d_inode_rcu(dentry->d_parent);
3fd945a7
JL		 2829 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2830 !IS_ENCRYPTED(dir)) {
c6b0b656
JL		 2831 *pino = ceph_ino(dir);
2832 rcu_read_unlock();
964fff74
JL		 2833 *ppath = dentry->d_name.name;
2834 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2835 return 0;
2836 }
c6b0b656 2837 rcu_read_unlock();
197b7d79 2838 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2839 if (IS_ERR(path))
2840 return PTR_ERR(path);
2841 *ppath = path;
1bcb3440 2842 *pfreepath = true;
2f2dc053
SW		 2843 return 0;
2844}
2845
2846static int build_inode_path(struct inode *inode,
2847 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2848 bool *pfreepath)
2f2dc053 2849{
197b7d79 2850 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2f2dc053
SW		 2851 struct dentry *dentry;
2852 char *path;
2853
2854 if (ceph_snap(inode) == CEPH_NOSNAP) {
2855 *pino = ceph_ino(inode);
2856 *ppathlen = 0;
2857 return 0;
2858 }
2859 dentry = d_find_alias(inode);
197b7d79 2860 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2861 dput(dentry);
2862 if (IS_ERR(path))
2863 return PTR_ERR(path);
2864 *ppath = path;
1bcb3440 2865 *pfreepath = true;
2f2dc053
SW		 2866 return 0;
2867}
2868
2869/*
2870 * request arguments may be specified via an inode *, a dentry *, or
2871 * an explicit ino+path.
2872 */
197b7d79
XL		 2873static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2874 struct dentry *rdentry, struct inode *rdiri,
2875 const char *rpath, u64 rino, const char **ppath,
2876 int *pathlen, u64 *ino, bool *freepath,
2877 bool parent_locked)
2f2dc053 2878{
38d46409 2879 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2880 int r = 0;
2881
2882 if (rinode) {
2883 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
38d46409
XL		 2884 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2885 ceph_snap(rinode));
2f2dc053 2886 } else if (rdentry) {
197b7d79 2887 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2888 freepath, parent_locked);
38d46409 2889 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
795858db 2890 } else if (rpath || rino) {
2f2dc053
SW		 2891 *ino = rino;
2892 *ppath = rpath;
b000056a 2893 *pathlen = rpath ? strlen(rpath) : 0;
38d46409 2894 doutc(cl, " path %.*s\n", *pathlen, rpath);
2f2dc053
SW		 2895 }
2896
2897 return r;
2898}
2899
2d332d5b
JL		 2900static void encode_mclientrequest_tail(void **p,
2901 const struct ceph_mds_request *req)
60267ba3
ID		 2902{
2903 struct ceph_timespec ts;
2904 int i;
2905
2906 ceph_encode_timespec64(&ts, &req->r_stamp);
2907 ceph_encode_copy(p, &ts, sizeof(ts));
2908
24865e75 2909 /* v4: gid_list */
60267ba3
ID		 2910 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2911 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2912 ceph_encode_64(p, from_kgid(&init_user_ns,
2913 req->r_cred->group_info->gid[i]));
2d332d5b 2914
24865e75
JL		 2915 /* v5: altname */
2916 ceph_encode_32(p, req->r_altname_len);
2917 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2d332d5b
JL		 2918
2919 /* v6: fscrypt_auth and fscrypt_file */
2920 if (req->r_fscrypt_auth) {
2921 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2922
2923 ceph_encode_32(p, authlen);
2924 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2925 } else {
2926 ceph_encode_32(p, 0);
2927 }
16be62fc
JL		 2928 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2929 ceph_encode_32(p, sizeof(__le64));
2930 ceph_encode_64(p, req->r_fscrypt_file);
2931 } else {
2932 ceph_encode_32(p, 0);
2933 }
60267ba3
ID		 2934}
2935
5ccd8530
CB		 2936static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2937{
2938 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2939 return 1;
2940
2941 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2942 return 2;
2943
2944 return CEPH_MDS_REQUEST_HEAD_VERSION;
2945}
2946
ce0d5bd3
XL		 2947static struct ceph_mds_request_head_legacy *
2948find_legacy_request_head(void *p, u64 features)
2949{
2950 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2f0805d7 2951 struct ceph_mds_request_head *head;
ce0d5bd3
XL		 2952
2953 if (legacy)
2954 return (struct ceph_mds_request_head_legacy *)p;
2f0805d7
LJ		 2955 head = (struct ceph_mds_request_head *)p;
2956 return (struct ceph_mds_request_head_legacy *)&head->oldest_client_tid;
ce0d5bd3
XL		 2957}
2958
2f2dc053
SW		 2959/*
2960 * called under mdsc->mutex
2961 */
4f1ddb1e 2962static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2f2dc053 2963 struct ceph_mds_request *req,
4f1ddb1e 2964 bool drop_cap_releases)
2f2dc053 2965{
4f1ddb1e
JL		 2966 int mds = session->s_mds;
2967 struct ceph_mds_client *mdsc = session->s_mdsc;
5ccd8530 2968 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 2969 struct ceph_msg *msg;
ce0d5bd3 2970 struct ceph_mds_request_head_legacy *lhead;
2f2dc053
SW		 2971 const char *path1 = NULL;
2972 const char *path2 = NULL;
2973 u64 ino1 = 0, ino2 = 0;
2974 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2975 bool freepath1 = false, freepath2 = false;
a5ffd7b6 2976 struct dentry *old_dentry = NULL;
60267ba3 2977 int len;
2f2dc053
SW		 2978 u16 releases;
2979 void *p, *end;
2980 int ret;
4f1ddb1e 2981 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
5ccd8530 2982 u16 request_head_version = mds_supported_head_version(session);
673478b6
AM		 2983 kuid_t caller_fsuid = req->r_cred->fsuid;
2984 kgid_t caller_fsgid = req->r_cred->fsgid;
2f2dc053 2985
197b7d79 2986 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
3dd69aab 2987 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2988 &path1, &pathlen1, &ino1, &freepath1,
2989 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2990 &req->r_req_flags));
2f2dc053
SW		 2991 if (ret < 0) {
2992 msg = ERR_PTR(ret);
2993 goto out;
2994 }
2995
1bcb3440 2996 /* If r_old_dentry is set, then assume that its parent is locked */
a5ffd7b6
XL		 2997 if (req->r_old_dentry &&
2998 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
2999 old_dentry = req->r_old_dentry;
197b7d79 3000 ret = set_request_path_attr(mdsc, NULL, old_dentry,
fd36a717 3001 req->r_old_dentry_dir,
2f2dc053 3002 req->r_path2, req->r_ino2.ino,
1bcb3440 3003 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 3004 if (ret < 0) {
3005 msg = ERR_PTR(ret);
3006 goto out_free1;
3007 }
3008
24865e75
JL		 3009 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
3010 if (IS_ERR(req->r_altname)) {
3011 msg = ERR_CAST(req->r_altname);
3012 req->r_altname = NULL;
3013 goto out_free2;
3014 }
3015
ce0d5bd3
XL		 3016 /*
3017 * For old cephs without supporting the 32bit retry/fwd feature
3018 * it will copy the raw memories directly when decoding the
3019 * requests. While new cephs will decode the head depending the
3020 * version member, so we need to make sure it will be compatible
3021 * with them both.
3022 */
3023 if (legacy)
3024 len = sizeof(struct ceph_mds_request_head_legacy);
5ccd8530 3025 else if (request_head_version == 1)
2f0805d7 3026 len = offsetofend(struct ceph_mds_request_head, args);
5ccd8530
CB		 3027 else if (request_head_version == 2)
3028 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
ce0d5bd3
XL		 3029 else
3030 len = sizeof(struct ceph_mds_request_head);
2f2dc053 3031
2d332d5b
JL		 3032 /* filepaths */
3033 len += 2 * (1 + sizeof(u32) + sizeof(u64));
3034 len += pathlen1 + pathlen2;
3035
3036 /* cap releases */
2f2dc053
SW		 3037 len += sizeof(struct ceph_mds_request_release) *
3038 (!!req->r_inode_drop + !!req->r_dentry_drop +
3039 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
4f1ddb1e 3040
2f2dc053 3041 if (req->r_dentry_drop)
c1dfc277 3042 len += pathlen1;
2f2dc053 3043 if (req->r_old_dentry_drop)
c1dfc277 3044 len += pathlen2;
2f2dc053 3045
2d332d5b
JL		 3046 /* MClientRequest tail */
3047
3048 /* req->r_stamp */
3049 len += sizeof(struct ceph_timespec);
3050
3051 /* gid list */
3052 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3053
3054 /* alternate name */
24865e75 3055 len += sizeof(u32) + req->r_altname_len;
2d332d5b
JL		 3056
3057 /* fscrypt_auth */
3058 len += sizeof(u32); // fscrypt_auth
3059 if (req->r_fscrypt_auth)
3060 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3061
3062 /* fscrypt_file */
3063 len += sizeof(u32);
16be62fc
JL		 3064 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3065 len += sizeof(__le64);
2d332d5b 3066
0d9c1ab3 3067 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 3068 if (!msg) {
3069 msg = ERR_PTR(-ENOMEM);
2f2dc053 3070 goto out_free2;
a79832f2 3071 }
2f2dc053 3072
6df058c0
SW		 3073 msg->hdr.tid = cpu_to_le64(req->r_tid);
3074
ce0d5bd3
XL		 3075 lhead = find_legacy_request_head(msg->front.iov_base,
3076 session->s_con.peer_features);
3077
5ccd8530
CB		 3078 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3079 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3080 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3081
673478b6
AM		 3082 if (enable_unsafe_idmap) {
3083 pr_warn_once_client(cl,
3084 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3085 " is not supported by MDS. UID/GID-based restrictions may"
3086 " not work properly.\n");
5ccd8530 3087
673478b6
AM		 3088 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3089 VFSUIDT_INIT(req->r_cred->fsuid));
3090 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3091 VFSGIDT_INIT(req->r_cred->fsgid));
3092 } else {
3093 pr_err_ratelimited_client(cl,
3094 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3095 " is not supported by MDS. Fail request with -EIO.\n");
3096
3097 ret = -EIO;
3098 goto out_err;
3099 }
5ccd8530
CB		 3100 }
3101
4f1ddb1e 3102 /*
ce0d5bd3 3103 * The ceph_mds_request_head_legacy didn't contain a version field, and
4f1ddb1e
JL		 3104 * one was added when we moved the message version from 3->4.
3105 */
3106 if (legacy) {
3107 msg->hdr.version = cpu_to_le16(3);
ce0d5bd3 3108 p = msg->front.iov_base + sizeof(*lhead);
5ccd8530 3109 } else if (request_head_version == 1) {
2f0805d7 3110 struct ceph_mds_request_head *nhead = msg->front.iov_base;
ce0d5bd3
XL		 3111
3112 msg->hdr.version = cpu_to_le16(4);
2f0805d7
LJ		 3113 nhead->version = cpu_to_le16(1);
3114 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, args);
5ccd8530
CB		 3115 } else if (request_head_version == 2) {
3116 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3117
3118 msg->hdr.version = cpu_to_le16(6);
3119 nhead->version = cpu_to_le16(2);
3120
3121 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
4f1ddb1e 3122 } else {
ce0d5bd3 3123 struct ceph_mds_request_head *nhead = msg->front.iov_base;
5ccd8530
CB		 3124 kuid_t owner_fsuid;
3125 kgid_t owner_fsgid;
4f1ddb1e 3126
2d332d5b 3127 msg->hdr.version = cpu_to_le16(6);
ce0d5bd3 3128 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
5ccd8530
CB		 3129 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3130
3131 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3132 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3133 VFSUIDT_INIT(req->r_cred->fsuid));
3134 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3135 VFSGIDT_INIT(req->r_cred->fsgid));
3136 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3137 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3138 } else {
3139 nhead->owner_uid = cpu_to_le32(-1);
3140 nhead->owner_gid = cpu_to_le32(-1);
3141 }
3142
ce0d5bd3 3143 p = msg->front.iov_base + sizeof(*nhead);
4f1ddb1e
JL		 3144 }
3145
2f2dc053
SW		 3146 end = msg->front.iov_base + msg->front.iov_len;
3147
ce0d5bd3
XL		 3148 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3149 lhead->op = cpu_to_le32(req->r_op);
3150 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
673478b6 3151 caller_fsuid));
ce0d5bd3 3152 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
673478b6 3153 caller_fsgid));
ce0d5bd3
XL		 3154 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3155 lhead->args = req->r_args;
2f2dc053
SW		 3156
3157 ceph_encode_filepath(&p, end, ino1, path1);
3158 ceph_encode_filepath(&p, end, ino2, path2);
3159
e979cf50
SW		 3160 /* make note of release offset, in case we need to replay */
3161 req->r_request_release_offset = p - msg->front.iov_base;
3162
2f2dc053
SW		 3163 /* cap releases */
3164 releases = 0;
3165 if (req->r_inode_drop)
3166 releases += ceph_encode_inode_release(&p,
2b0143b5 3167 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
719a2514
YZ		 3168 mds, req->r_inode_drop, req->r_inode_unless,
3169 req->r_op == CEPH_MDS_OP_READDIR);
3fd945a7
JL		 3170 if (req->r_dentry_drop) {
3171 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 3172 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 3173 req->r_dentry_unless);
3fd945a7
JL		 3174 if (ret < 0)
3175 goto out_err;
3176 releases += ret;
3177 }
3178 if (req->r_old_dentry_drop) {
3179 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 3180 req->r_old_dentry_dir, mds,
3181 req->r_old_dentry_drop,
3182 req->r_old_dentry_unless);
3fd945a7
JL		 3183 if (ret < 0)
3184 goto out_err;
3185 releases += ret;
3186 }
2f2dc053
SW		 3187 if (req->r_old_inode_drop)
3188 releases += ceph_encode_inode_release(&p,
2b0143b5 3189 d_inode(req->r_old_dentry),
2f2dc053 3190 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 3191
3192 if (drop_cap_releases) {
3193 releases = 0;
3194 p = msg->front.iov_base + req->r_request_release_offset;
3195 }
3196
ce0d5bd3 3197 lhead->num_releases = cpu_to_le16(releases);
2f2dc053 3198
2d332d5b 3199 encode_mclientrequest_tail(&p, req);
4f1ddb1e 3200
b682c6d4
XL		 3201 if (WARN_ON_ONCE(p > end)) {
3202 ceph_msg_put(msg);
3203 msg = ERR_PTR(-ERANGE);
3204 goto out_free2;
3205 }
3206
2f2dc053
SW		 3207 msg->front.iov_len = p - msg->front.iov_base;
3208 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3209
25e6bae3
YZ		 3210 if (req->r_pagelist) {
3211 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 3212 ceph_msg_data_add_pagelist(msg, pagelist);
3213 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3214 } else {
3215 msg->hdr.data_len = 0;
ebf18f47 3216 }
02afca6c 3217
2f2dc053
SW		 3218 msg->hdr.data_off = cpu_to_le16(0);
3219
3220out_free2:
3221 if (freepath2)
f77f21bb 3222 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 3223out_free1:
3224 if (freepath1)
f77f21bb 3225 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 3226out:
3227 return msg;
3fd945a7
JL		 3228out_err:
3229 ceph_msg_put(msg);
3230 msg = ERR_PTR(ret);
3231 goto out_free2;
2f2dc053
SW		 3232}
3233
3234/*
3235 * called under mdsc->mutex if error, under no mutex if
3236 * success.
3237 */
3238static void complete_request(struct ceph_mds_client *mdsc,
3239 struct ceph_mds_request *req)
3240{
70c94820
XL		 3241 req->r_end_latency = ktime_get();
3242
2f2dc053
SW		 3243 if (req->r_callback)
3244 req->r_callback(mdsc, req);
111c7081 3245 complete_all(&req->r_completion);
2f2dc053
SW		 3246}
3247
3248/*
3249 * called under mdsc->mutex
3250 */
396bd62c 3251static int __prepare_send_request(struct ceph_mds_session *session,
2f2dc053 3252 struct ceph_mds_request *req,
396bd62c 3253 bool drop_cap_releases)
2f2dc053 3254{
396bd62c
JL		 3255 int mds = session->s_mds;
3256 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3257 struct ceph_client *cl = mdsc->fsc->client;
ce0d5bd3
XL		 3258 struct ceph_mds_request_head_legacy *lhead;
3259 struct ceph_mds_request_head *nhead;
2f2dc053 3260 struct ceph_msg *msg;
ce0d5bd3
XL		 3261 int flags = 0, old_max_retry;
3262 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3263 &session->s_features);
546a5d61
XL		 3264
3265 /*
3500000b 3266 * Avoid infinite retrying after overflow. The client will
ce0d5bd3
XL		 3267 * increase the retry count and if the MDS is old version,
3268 * so we limit to retry at most 256 times.
546a5d61 3269 */
ce0d5bd3 3270 if (req->r_attempts) {
2f0805d7 3271 old_max_retry = sizeof_field(struct ceph_mds_request_head,
ce0d5bd3
XL		 3272 num_retry);
3273 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3274 if ((old_version && req->r_attempts >= old_max_retry) ||
3275 ((uint32_t)req->r_attempts >= U32_MAX)) {
38d46409
XL		 3276 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3277 req->r_tid);
ce0d5bd3
XL		 3278 return -EMULTIHOP;
3279 }
546a5d61 3280 }
2f2dc053 3281
2f2dc053 3282 req->r_attempts++;
e55b71f8
GF		 3283 if (req->r_inode) {
3284 struct ceph_cap *cap =
3285 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3286
3287 if (cap)
3288 req->r_sent_on_mseq = cap->mseq;
3289 else
3290 req->r_sent_on_mseq = -1;
3291 }
38d46409
XL		 3292 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3293 ceph_mds_op_name(req->r_op), req->r_attempts);
2f2dc053 3294
bc2de10d 3295 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 3296 void *p;
4f1ddb1e 3297
01a92f17
SW		 3298 /*
3299 * Replay. Do not regenerate message (and rebuild
3300 * paths, etc.); just use the original message.
3301 * Rebuilding paths will break for renames because
3302 * d_move mangles the src name.
3303 */
3304 msg = req->r_request;
ce0d5bd3
XL		 3305 lhead = find_legacy_request_head(msg->front.iov_base,
3306 session->s_con.peer_features);
01a92f17 3307
ce0d5bd3 3308 flags = le32_to_cpu(lhead->flags);
01a92f17 3309 flags |= CEPH_MDS_FLAG_REPLAY;
ce0d5bd3 3310 lhead->flags = cpu_to_le32(flags);
01a92f17
SW		 3311
3312 if (req->r_target_inode)
ce0d5bd3 3313 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
01a92f17 3314
ce0d5bd3
XL		 3315 lhead->num_retry = req->r_attempts - 1;
3316 if (!old_version) {
3317 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3318 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3319 }
e979cf50
SW		 3320
3321 /* remove cap/dentry releases from message */
ce0d5bd3 3322 lhead->num_releases = 0;
c5c9a0bf 3323
c5c9a0bf 3324 p = msg->front.iov_base + req->r_request_release_offset;
2d332d5b 3325 encode_mclientrequest_tail(&p, req);
c5c9a0bf
YZ		 3326
3327 msg->front.iov_len = p - msg->front.iov_base;
3328 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 3329 return 0;
3330 }
3331
2f2dc053
SW		 3332 if (req->r_request) {
3333 ceph_msg_put(req->r_request);
3334 req->r_request = NULL;
3335 }
4f1ddb1e 3336 msg = create_request_message(session, req, drop_cap_releases);
2f2dc053 3337 if (IS_ERR(msg)) {
e1518c7c 3338 req->r_err = PTR_ERR(msg);
a79832f2 3339 return PTR_ERR(msg);
2f2dc053
SW		 3340 }
3341 req->r_request = msg;
3342
ce0d5bd3
XL		 3343 lhead = find_legacy_request_head(msg->front.iov_base,
3344 session->s_con.peer_features);
3345 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 3346 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 3347 flags |= CEPH_MDS_FLAG_REPLAY;
3bb48b41
JL		 3348 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3349 flags |= CEPH_MDS_FLAG_ASYNC;
3dd69aab 3350 if (req->r_parent)
2f2dc053 3351 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
ce0d5bd3
XL		 3352 lhead->flags = cpu_to_le32(flags);
3353 lhead->num_fwd = req->r_num_fwd;
3354 lhead->num_retry = req->r_attempts - 1;
3355 if (!old_version) {
3356 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3357 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3358 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3359 }
2f2dc053 3360
38d46409 3361 doutc(cl, " r_parent = %p\n", req->r_parent);
2f2dc053
SW		 3362 return 0;
3363}
3364
9cf54563
XL		 3365/*
3366 * called under mdsc->mutex
3367 */
396bd62c 3368static int __send_request(struct ceph_mds_session *session,
9cf54563
XL		 3369 struct ceph_mds_request *req,
3370 bool drop_cap_releases)
3371{
3372 int err;
3373
396bd62c 3374 err = __prepare_send_request(session, req, drop_cap_releases);
9cf54563
XL		 3375 if (!err) {
3376 ceph_msg_get(req->r_request);
3377 ceph_con_send(&session->s_con, req->r_request);
3378 }
3379
3380 return err;
3381}
3382
2f2dc053
SW		 3383/*
3384 * send request, or put it on the appropriate wait list.
3385 */
d5548492 3386static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 3387 struct ceph_mds_request *req)
3388{
38d46409 3389 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3390 struct ceph_mds_session *session = NULL;
3391 int mds = -1;
48fec5d0 3392 int err = 0;
c4853e97 3393 bool random;
2f2dc053 3394
bc2de10d
JL		 3395 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3396 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 3397 __unregister_request(mdsc, req);
d5548492 3398 return;
eb1b8af3 3399 }
2f2dc053 3400
a68e564a 3401 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
38d46409 3402 doutc(cl, "metadata corrupted\n");
a68e564a
XL		 3403 err = -EIO;
3404 goto finish;
3405 }
2f2dc053
SW		 3406 if (req->r_timeout &&
3407 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
38d46409 3408 doutc(cl, "timed out\n");
8ccf7fcc 3409 err = -ETIMEDOUT;
2f2dc053
SW		 3410 goto finish;
3411 }
52953d55 3412 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
38d46409 3413 doutc(cl, "forced umount\n");
48fec5d0
YZ		 3414 err = -EIO;
3415 goto finish;
3416 }
52953d55 3417 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 3418 if (mdsc->mdsmap_err) {
3419 err = mdsc->mdsmap_err;
38d46409 3420 doutc(cl, "mdsmap err %d\n", err);
e9e427f0
YZ		 3421 goto finish;
3422 }
cc8e8342 3423 if (mdsc->mdsmap->m_epoch == 0) {
38d46409 3424 doutc(cl, "no mdsmap, waiting for map\n");
cc8e8342 3425 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3426 return;
cc8e8342 3427 }
e9e427f0
YZ		 3428 if (!(mdsc->fsc->mount_options->flags &
3429 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3430 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
97820058 3431 err = -EHOSTUNREACH;
e9e427f0
YZ		 3432 goto finish;
3433 }
3434 }
2f2dc053 3435
dc69e2e9
SW		 3436 put_request_session(req);
3437
c4853e97 3438 mds = __choose_mds(mdsc, req, &random);
2f2dc053
SW		 3439 if (mds < 0 ||
3440 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3bb48b41
JL		 3441 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3442 err = -EJUKEBOX;
3443 goto finish;
3444 }
38d46409 3445 doutc(cl, "no mds or not active, waiting for map\n");
2f2dc053 3446 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3447 return;
2f2dc053
SW		 3448 }
3449
3450 /* get, open session */
3451 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 3452 if (!session) {
2f2dc053 3453 session = register_session(mdsc, mds);
9c423956
SW		 3454 if (IS_ERR(session)) {
3455 err = PTR_ERR(session);
3456 goto finish;
3457 }
3458 }
5b3248c6 3459 req->r_session = ceph_get_mds_session(session);
dc69e2e9 3460
38d46409
XL		 3461 doutc(cl, "mds%d session %p state %s\n", mds, session,
3462 ceph_session_state_name(session->s_state));
6eb06c46
XL		 3463
3464 /*
3465 * The old ceph will crash the MDSs when see unknown OPs
3466 */
3467 if (req->r_feature_needed > 0 &&
3468 !test_bit(req->r_feature_needed, &session->s_features)) {
3469 err = -EOPNOTSUPP;
3470 goto out_session;
3471 }
3472
2f2dc053
SW		 3473 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3474 session->s_state != CEPH_MDS_SESSION_HUNG) {
3bb48b41
JL		 3475 /*
3476 * We cannot queue async requests since the caps and delegated
3477 * inodes are bound to the session. Just return -EJUKEBOX and
3478 * let the caller retry a sync request in that case.
3479 */
3480 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3481 err = -EJUKEBOX;
3482 goto out_session;
3483 }
4ae3713f
JL		 3484
3485 /*
3486 * If the session has been REJECTED, then return a hard error,
3487 * unless it's a CLEANRECOVER mount, in which case we'll queue
3488 * it to the mdsc queue.
3489 */
3490 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3491 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3492 list_add(&req->r_wait, &mdsc->waiting_for_map);
3493 else
3494 err = -EACCES;
3495 goto out_session;
3496 }
3497
2f2dc053 3498 if (session->s_state == CEPH_MDS_SESSION_NEW ||
c4853e97 3499 session->s_state == CEPH_MDS_SESSION_CLOSING) {
b682c6d4
XL		 3500 err = __open_session(mdsc, session);
3501 if (err)
3502 goto out_session;
c4853e97
XL		 3503 /* retry the same mds later */
3504 if (random)
3505 req->r_resend_mds = mds;
3506 }
2f2dc053
SW		 3507 list_add(&req->r_wait, &session->s_waiting);
3508 goto out_session;
3509 }
3510
3511 /* send request */
2f2dc053
SW		 3512 req->r_resend_mds = -1; /* forget any previous mds hint */
3513
3514 if (req->r_request_started == 0) /* note request start time */
3515 req->r_request_started = jiffies;
3516
00061645
XL		 3517 /*
3518 * For async create we will choose the auth MDS of frag in parent
3500000b 3519 * directory to send the request and usually this works fine, but
00061645
XL		 3520 * if the migrated the dirtory to another MDS before it could handle
3521 * it the request will be forwarded.
3522 *
3523 * And then the auth cap will be changed.
3524 */
3525 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3526 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3527 struct ceph_inode_info *ci;
3528 struct ceph_cap *cap;
3529
3530 /*
3531 * The request maybe handled very fast and the new inode
3532 * hasn't been linked to the dentry yet. We need to wait
3533 * for the ceph_finish_async_create(), which shouldn't be
3534 * stuck too long or fail in thoery, to finish when forwarding
3535 * the request.
3536 */
3537 if (!d_inode(req->r_dentry)) {
3538 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3539 TASK_KILLABLE);
3540 if (err) {
3541 mutex_lock(&req->r_fill_mutex);
3542 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3543 mutex_unlock(&req->r_fill_mutex);
3544 goto out_session;
3545 }
3546 }
3547
3548 ci = ceph_inode(d_inode(req->r_dentry));
3549
3550 spin_lock(&ci->i_ceph_lock);
3551 cap = ci->i_auth_cap;
3552 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
38d46409
XL		 3553 doutc(cl, "session changed for auth cap %d -> %d\n",
3554 cap->session->s_mds, session->s_mds);
00061645
XL		 3555
3556 /* Remove the auth cap from old session */
3557 spin_lock(&cap->session->s_cap_lock);
3558 cap->session->s_nr_caps--;
3559 list_del_init(&cap->session_caps);
3560 spin_unlock(&cap->session->s_cap_lock);
3561
3562 /* Add the auth cap to the new session */
3563 cap->mds = mds;
3564 cap->session = session;
3565 spin_lock(&session->s_cap_lock);
3566 session->s_nr_caps++;
3567 list_add_tail(&cap->session_caps, &session->s_caps);
3568 spin_unlock(&session->s_cap_lock);
3569
3570 change_auth_cap_ses(ci, session);
3571 }
3572 spin_unlock(&ci->i_ceph_lock);
3573 }
3574
396bd62c 3575 err = __send_request(session, req, false);
2f2dc053
SW		 3576
3577out_session:
3578 ceph_put_mds_session(session);
48fec5d0
YZ		 3579finish:
3580 if (err) {
38d46409 3581 doutc(cl, "early error %d\n", err);
48fec5d0
YZ		 3582 req->r_err = err;
3583 complete_request(mdsc, req);
3584 __unregister_request(mdsc, req);
3585 }
d5548492 3586 return;
2f2dc053
SW		 3587}
3588
3589/*
3590 * called under mdsc->mutex
3591 */
3592static void __wake_requests(struct ceph_mds_client *mdsc,
3593 struct list_head *head)
3594{
38d46409 3595 struct ceph_client *cl = mdsc->fsc->client;
ed75ec2c
YZ		 3596 struct ceph_mds_request *req;
3597 LIST_HEAD(tmp_list);
3598
3599 list_splice_init(head, &tmp_list);
2f2dc053 3600
ed75ec2c
YZ		 3601 while (!list_empty(&tmp_list)) {
3602 req = list_entry(tmp_list.next,
3603 struct ceph_mds_request, r_wait);
2f2dc053 3604 list_del_init(&req->r_wait);
38d46409
XL		 3605 doutc(cl, " wake request %p tid %llu\n", req,
3606 req->r_tid);
2f2dc053
SW		 3607 __do_request(mdsc, req);
3608 }
3609}
3610
3611/*
3612 * Wake up threads with requests pending for @mds, so that they can
29790f26 3613 * resubmit their requests to a possibly different mds.
2f2dc053 3614 */
29790f26 3615static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 3616{
38d46409 3617 struct ceph_client *cl = mdsc->fsc->client;
44ca18f2 3618 struct ceph_mds_request *req;
282c1052 3619 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053 3620
38d46409 3621 doutc(cl, "kick_requests mds%d\n", mds);
282c1052 3622 while (p) {
44ca18f2 3623 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 3624 p = rb_next(p);
bc2de10d 3625 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 3626 continue;
3de22be6
YZ		 3627 if (req->r_attempts > 0)
3628 continue; /* only new requests */
44ca18f2
SW		 3629 if (req->r_session &&
3630 req->r_session->s_mds == mds) {
38d46409 3631 doutc(cl, " kicking tid %llu\n", req->r_tid);
03974e81 3632 list_del_init(&req->r_wait);
44ca18f2 3633 __do_request(mdsc, req);
2f2dc053
SW		 3634 }
3635 }
3636}
3637
86bda539 3638int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 3639 struct ceph_mds_request *req)
3640{
38d46409 3641 struct ceph_client *cl = mdsc->fsc->client;
891f3f5a 3642 int err = 0;
86bda539
JL		 3643
3644 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3645 if (req->r_inode)
3646 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
9c1c2b35 3647 if (req->r_parent) {
719a2514
YZ		 3648 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3649 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3650 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3651 spin_lock(&ci->i_ceph_lock);
3652 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3653 __ceph_touch_fmode(ci, mdsc, fmode);
3654 spin_unlock(&ci->i_ceph_lock);
9c1c2b35 3655 }
86bda539
JL		 3656 if (req->r_old_dentry_dir)
3657 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3658 CEPH_CAP_PIN);
3659
891f3f5a
JL		 3660 if (req->r_inode) {
3661 err = ceph_wait_on_async_create(req->r_inode);
3662 if (err) {
38d46409 3663 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3664 return err;
3665 }
3666 }
3667
3668 if (!err && req->r_old_inode) {
3669 err = ceph_wait_on_async_create(req->r_old_inode);
3670 if (err) {
38d46409 3671 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3672 return err;
3673 }
3674 }
3675
38d46409 3676 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
2f2dc053 3677 mutex_lock(&mdsc->mutex);
86bda539 3678 __register_request(mdsc, req, dir);
2f2dc053 3679 __do_request(mdsc, req);
86bda539 3680 err = req->r_err;
2f2dc053 3681 mutex_unlock(&mdsc->mutex);
86bda539 3682 return err;
2f2dc053
SW		 3683}
3684
9eaa7b79
JL		 3685int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3686 struct ceph_mds_request *req,
3687 ceph_mds_request_wait_callback_t wait_func)
2f2dc053 3688{
38d46409 3689 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3690 int err;
3691
e1518c7c 3692 /* wait */
38d46409 3693 doutc(cl, "do_request waiting\n");
9eaa7b79
JL		 3694 if (wait_func) {
3695 err = wait_func(mdsc, req);
e1518c7c 3696 } else {
5be73034
ID		 3697 long timeleft = wait_for_completion_killable_timeout(
3698 &req->r_completion,
3699 ceph_timeout_jiffies(req->r_timeout));
3700 if (timeleft > 0)
3701 err = 0;
3702 else if (!timeleft)
8ccf7fcc 3703 err = -ETIMEDOUT; /* timed out */
5be73034
ID		 3704 else
3705 err = timeleft; /* killed */
e1518c7c 3706 }
38d46409 3707 doutc(cl, "do_request waited, got %d\n", err);
e1518c7c 3708 mutex_lock(&mdsc->mutex);
5b1daecd 3709
e1518c7c 3710 /* only abort if we didn't race with a real reply */
bc2de10d 3711 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 3712 err = le32_to_cpu(req->r_reply_info.head->result);
3713 } else if (err < 0) {
38d46409 3714 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 3715
3716 /*
3717 * ensure we aren't running concurrently with
3718 * ceph_fill_trace or ceph_readdir_prepopulate, which
3719 * rely on locks (dir mutex) held by our caller.
3720 */
3721 mutex_lock(&req->r_fill_mutex);
e1518c7c 3722 req->r_err = err;
bc2de10d 3723 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 3724 mutex_unlock(&req->r_fill_mutex);
5b1daecd 3725
3dd69aab 3726 if (req->r_parent &&
167c9e35
SW		 3727 (req->r_op & CEPH_MDS_OP_WRITE))
3728 ceph_invalidate_dir_request(req);
2f2dc053 3729 } else {
e1518c7c 3730 err = req->r_err;
2f2dc053 3731 }
2f2dc053 3732
e1518c7c 3733 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 3734 return err;
3735}
3736
3737/*
3738 * Synchrously perform an mds request. Take care of all of the
3739 * session setup, forwarding, retry details.
3740 */
3741int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3742 struct inode *dir,
3743 struct ceph_mds_request *req)
3744{
38d46409 3745 struct ceph_client *cl = mdsc->fsc->client;
8340f22c
JL		 3746 int err;
3747
38d46409 3748 doutc(cl, "do_request on %p\n", req);
8340f22c
JL		 3749
3750 /* issue */
3751 err = ceph_mdsc_submit_request(mdsc, dir, req);
3752 if (!err)
9eaa7b79 3753 err = ceph_mdsc_wait_request(mdsc, req, NULL);
38d46409 3754 doutc(cl, "do_request %p done, result %d\n", req, err);
2f2dc053
SW		 3755 return err;
3756}
3757
167c9e35 3758/*
2f276c51 3759 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 3760 * namespace request.
3761 */
3762void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3763{
8d8f371c
YZ		 3764 struct inode *dir = req->r_parent;
3765 struct inode *old_dir = req->r_old_dentry_dir;
38d46409 3766 struct ceph_client *cl = req->r_mdsc->fsc->client;
167c9e35 3767
38d46409
XL		 3768 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3769 dir, old_dir);
167c9e35 3770
8d8f371c
YZ		 3771 ceph_dir_clear_complete(dir);
3772 if (old_dir)
3773 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 3774 if (req->r_dentry)
3775 ceph_invalidate_dentry_lease(req->r_dentry);
3776 if (req->r_old_dentry)
3777 ceph_invalidate_dentry_lease(req->r_old_dentry);
3778}
3779
2f2dc053
SW		 3780/*
3781 * Handle mds reply.
3782 *
3783 * We take the session mutex and parse and process the reply immediately.
3784 * This preserves the logical ordering of replies, capabilities, etc., sent
3785 * by the MDS as they are applied to our local cache.
3786 */
3787static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3788{
3789 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3790 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3791 struct ceph_mds_request *req;
3792 struct ceph_mds_reply_head *head = msg->front.iov_base;
3793 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 3794 struct ceph_snap_realm *realm;
2f2dc053
SW		 3795 u64 tid;
3796 int err, result;
2600d2dd 3797 int mds = session->s_mds;
a68e564a 3798 bool close_sessions = false;
2f2dc053 3799
2f2dc053 3800 if (msg->front.iov_len < sizeof(*head)) {
38d46409 3801 pr_err_client(cl, "got corrupt (short) reply\n");
9ec7cab1 3802 ceph_msg_dump(msg);
2f2dc053
SW		 3803 return;
3804 }
3805
3806 /* get request, session */
6df058c0 3807 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 3808 mutex_lock(&mdsc->mutex);
fcd00b68 3809 req = lookup_get_request(mdsc, tid);
2f2dc053 3810 if (!req) {
38d46409 3811 doutc(cl, "on unknown tid %llu\n", tid);
2f2dc053
SW		 3812 mutex_unlock(&mdsc->mutex);
3813 return;
3814 }
38d46409 3815 doutc(cl, "handle_reply %p\n", req);
2f2dc053
SW		 3816
3817 /* correct session? */
d96d6049 3818 if (req->r_session != session) {
38d46409
XL		 3819 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3820 tid, session->s_mds,
3821 req->r_session ? req->r_session->s_mds : -1);
2f2dc053
SW		 3822 mutex_unlock(&mdsc->mutex);
3823 goto out;
3824 }
3825
3826 /* dup? */
bc2de10d
JL		 3827 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3828 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
38d46409
XL		 3829 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3830 head->safe ? "safe" : "unsafe", tid, mds);
2f2dc053
SW		 3831 mutex_unlock(&mdsc->mutex);
3832 goto out;
3833 }
bc2de10d 3834 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
38d46409
XL		 3835 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3836 tid, mds);
85792d0d
SW		 3837 mutex_unlock(&mdsc->mutex);
3838 goto out;
3839 }
2f2dc053
SW		 3840
3841 result = le32_to_cpu(head->result);
3842
2f2dc053 3843 if (head->safe) {
bc2de10d 3844 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 3845 __unregister_request(mdsc, req);
2f2dc053 3846
07edc057
XL		 3847 /* last request during umount? */
3848 if (mdsc->stopping && !__get_oldest_req(mdsc))
3849 complete_all(&mdsc->safe_umount_waiters);
3850
bc2de10d 3851 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 3852 /*
3853 * We already handled the unsafe response, now do the
3854 * cleanup. No need to examine the response; the MDS
3855 * doesn't include any result info in the safe
3856 * response. And even if it did, there is nothing
3857 * useful we could do with a revised return value.
3858 */
38d46409 3859 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
2f2dc053 3860
2f2dc053
SW		 3861 mutex_unlock(&mdsc->mutex);
3862 goto out;
3863 }
e1518c7c 3864 } else {
bc2de10d 3865 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053
SW		 3866 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3867 }
3868
38d46409 3869 doutc(cl, "tid %lld result %d\n", tid, result);
b37fe1f9 3870 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3859af9e 3871 err = parse_reply_info(session, msg, req, (u64)-1);
b37fe1f9 3872 else
3859af9e
XL		 3873 err = parse_reply_info(session, msg, req,
3874 session->s_con.peer_features);
2f2dc053
SW		 3875 mutex_unlock(&mdsc->mutex);
3876
bca9fc14 3877 /* Must find target inode outside of mutexes to avoid deadlocks */
3859af9e 3878 rinfo = &req->r_reply_info;
bca9fc14 3879 if ((err >= 0) && rinfo->head->is_target) {
ec9595c0 3880 struct inode *in = xchg(&req->r_new_inode, NULL);
bca9fc14
JL		 3881 struct ceph_vino tvino = {
3882 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3883 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3884 };
3885
ec9595c0
JL		 3886 /*
3887 * If we ended up opening an existing inode, discard
3888 * r_new_inode
3889 */
3890 if (req->r_op == CEPH_MDS_OP_CREATE &&
3891 !req->r_reply_info.has_create_ino) {
3892 /* This should never happen on an async create */
3893 WARN_ON_ONCE(req->r_deleg_ino);
3894 iput(in);
3895 in = NULL;
3896 }
3897
3898 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
bca9fc14
JL		 3899 if (IS_ERR(in)) {
3900 err = PTR_ERR(in);
3901 mutex_lock(&session->s_mutex);
3902 goto out_err;
3903 }
3904 req->r_target_inode = in;
3905 }
3906
2f2dc053
SW		 3907 mutex_lock(&session->s_mutex);
3908 if (err < 0) {
38d46409
XL		 3909 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3910 mds, tid);
9ec7cab1 3911 ceph_msg_dump(msg);
2f2dc053
SW		 3912 goto out_err;
3913 }
3914
3915 /* snap trace */
982d6011 3916 realm = NULL;
2f2dc053
SW		 3917 if (rinfo->snapblob_len) {
3918 down_write(&mdsc->snap_rwsem);
a68e564a 3919 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 3920 rinfo->snapblob + rinfo->snapblob_len,
3921 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3922 &realm);
a68e564a
XL		 3923 if (err) {
3924 up_write(&mdsc->snap_rwsem);
3925 close_sessions = true;
3926 if (err == -EIO)
3927 ceph_msg_dump(msg);
3928 goto out_err;
3929 }
2f2dc053
SW		 3930 downgrade_write(&mdsc->snap_rwsem);
3931 } else {
3932 down_read(&mdsc->snap_rwsem);
3933 }
3934
3935 /* insert trace into our cache */
b4556396 3936 mutex_lock(&req->r_fill_mutex);
315f2408 3937 current->journal_info = req;
f5a03b08 3938 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 3939 if (err == 0) {
6e8575fa 3940 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 3941 req->r_op == CEPH_MDS_OP_LSSNAP))
af9ffa6d 3942 err = ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 3943 }
315f2408 3944 current->journal_info = NULL;
b4556396 3945 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 3946
3947 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 3948 if (realm)
3949 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 3950
fe33032d
YZ		 3951 if (err == 0) {
3952 if (req->r_target_inode &&
3953 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3954 struct ceph_inode_info *ci =
3955 ceph_inode(req->r_target_inode);
3956 spin_lock(&ci->i_unsafe_lock);
3957 list_add_tail(&req->r_unsafe_target_item,
3958 &ci->i_unsafe_iops);
3959 spin_unlock(&ci->i_unsafe_lock);
3960 }
3961
3962 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 3963 }
2f2dc053 3964out_err:
e1518c7c 3965 mutex_lock(&mdsc->mutex);
bc2de10d 3966 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 3967 if (err) {
3968 req->r_err = err;
3969 } else {
5fdb1389 3970 req->r_reply = ceph_msg_get(msg);
bc2de10d 3971 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 3972 }
2f2dc053 3973 } else {
38d46409 3974 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
2f2dc053 3975 }
e1518c7c 3976 mutex_unlock(&mdsc->mutex);
2f2dc053 3977
2f2dc053
SW		 3978 mutex_unlock(&session->s_mutex);
3979
3980 /* kick calling process */
3981 complete_request(mdsc, req);
70c94820 3982
8ae99ae2 3983 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
70c94820 3984 req->r_end_latency, err);
2f2dc053
SW		 3985out:
3986 ceph_mdsc_put_request(req);
a68e564a
XL		 3987
3988 /* Defer closing the sessions after s_mutex lock being released */
3989 if (close_sessions)
3990 ceph_mdsc_close_sessions(mdsc);
2f2dc053
SW		 3991 return;
3992}
3993
3994
3995
3996/*
3997 * handle mds notification that our request has been forwarded.
3998 */
2600d2dd
SW		 3999static void handle_forward(struct ceph_mds_client *mdsc,
4000 struct ceph_mds_session *session,
4001 struct ceph_msg *msg)
2f2dc053 4002{
38d46409 4003 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4004 struct ceph_mds_request *req;
a1ea787c 4005 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 4006 u32 next_mds;
4007 u32 fwd_seq;
2f2dc053
SW		 4008 int err = -EINVAL;
4009 void *p = msg->front.iov_base;
4010 void *end = p + msg->front.iov_len;
1980b1bf 4011 bool aborted = false;
2f2dc053 4012
a1ea787c 4013 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 4014 next_mds = ceph_decode_32(&p);
4015 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 4016
4017 mutex_lock(&mdsc->mutex);
fcd00b68 4018 req = lookup_get_request(mdsc, tid);
2f2dc053 4019 if (!req) {
1980b1bf 4020 mutex_unlock(&mdsc->mutex);
38d46409 4021 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
1980b1bf 4022 return; /* dup reply? */
2f2dc053
SW		 4023 }
4024
bc2de10d 4025 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
38d46409 4026 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
2a8e5e36 4027 __unregister_request(mdsc, req);
ce0d5bd3 4028 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
1980b1bf 4029 /*
3500000b 4030 * Avoid infinite retrying after overflow.
1980b1bf 4031 *
ce0d5bd3
XL		 4032 * The MDS will increase the fwd count and in client side
4033 * if the num_fwd is less than the one saved in request
4034 * that means the MDS is an old version and overflowed of
4035 * 8 bits.
1980b1bf 4036 */
ce0d5bd3
XL		 4037 mutex_lock(&req->r_fill_mutex);
4038 req->r_err = -EMULTIHOP;
4039 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
4040 mutex_unlock(&req->r_fill_mutex);
4041 aborted = true;
38d46409
XL		 4042 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
4043 tid);
2f2dc053
SW		 4044 } else {
4045 /* resend. forward race not possible; mds would drop */
38d46409 4046 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2a8e5e36 4047 BUG_ON(req->r_err);
bc2de10d 4048 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 4049 req->r_attempts = 0;
2f2dc053
SW		 4050 req->r_num_fwd = fwd_seq;
4051 req->r_resend_mds = next_mds;
4052 put_request_session(req);
4053 __do_request(mdsc, req);
4054 }
2f2dc053 4055 mutex_unlock(&mdsc->mutex);
1980b1bf
XL		 4056
4057 /* kick calling process */
4058 if (aborted)
4059 complete_request(mdsc, req);
4060 ceph_mdsc_put_request(req);
2f2dc053
SW		 4061 return;
4062
4063bad:
38d46409 4064 pr_err_client(cl, "decode error err=%d\n", err);
8b0da5c5 4065 ceph_msg_dump(msg);
2f2dc053
SW		 4066}
4067
131d7eb4 4068static int __decode_session_metadata(void **p, void *end,
0b98acd6 4069 bool *blocklisted)
84bf3950
YZ		 4070{
4071 /* map<string,string> */
4072 u32 n;
131d7eb4 4073 bool err_str;
84bf3950
YZ		 4074 ceph_decode_32_safe(p, end, n, bad);
4075 while (n-- > 0) {
4076 u32 len;
4077 ceph_decode_32_safe(p, end, len, bad);
4078 ceph_decode_need(p, end, len, bad);
131d7eb4 4079 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 4080 *p += len;
4081 ceph_decode_32_safe(p, end, len, bad);
4082 ceph_decode_need(p, end, len, bad);
4bb926e8
ID		 4083 /*
4084 * Match "blocklisted (blacklisted)" from newer MDSes,
4085 * or "blacklisted" from older MDSes.
4086 */
131d7eb4 4087 if (err_str && strnstr(*p, "blacklisted", len))
0b98acd6 4088 *blocklisted = true;
84bf3950
YZ		 4089 *p += len;
4090 }
4091 return 0;
4092bad:
4093 return -1;
4094}
4095
2f2dc053
SW		 4096/*
4097 * handle a mds session control message
4098 */
4099static void handle_session(struct ceph_mds_session *session,
4100 struct ceph_msg *msg)
4101{
4102 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 4103 struct ceph_client *cl = mdsc->fsc->client;
84bf3950
YZ		 4104 int mds = session->s_mds;
4105 int msg_version = le16_to_cpu(msg->hdr.version);
4106 void *p = msg->front.iov_base;
4107 void *end = p + msg->front.iov_len;
4108 struct ceph_mds_session_head *h;
1d17de95
XL		 4109 struct ceph_mds_cap_auth *cap_auths = NULL;
4110 u32 op, cap_auths_num = 0;
0fa82633 4111 u64 seq, features = 0;
2f2dc053 4112 int wake = 0;
0b98acd6 4113 bool blocklisted = false;
1d17de95
XL		 4114 u32 i;
4115
2f2dc053 4116
2f2dc053 4117 /* decode */
84bf3950
YZ		 4118 ceph_decode_need(&p, end, sizeof(*h), bad);
4119 h = p;
4120 p += sizeof(*h);
4121
2f2dc053
SW		 4122 op = le32_to_cpu(h->op);
4123 seq = le64_to_cpu(h->seq);
4124
84bf3950
YZ		 4125 if (msg_version >= 3) {
4126 u32 len;
e1c9788c
KH		 4127 /* version >= 2 and < 5, decode metadata, skip otherwise
4128 * as it's handled via flags.
4129 */
4130 if (msg_version >= 5)
4131 ceph_decode_skip_map(&p, end, string, string, bad);
4132 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
84bf3950 4133 goto bad;
e1c9788c 4134
84bf3950
YZ		 4135 /* version >= 3, feature bits */
4136 ceph_decode_32_safe(&p, end, len, bad);
02e37571
JL		 4137 if (len) {
4138 ceph_decode_64_safe(&p, end, features, bad);
4139 p += len - sizeof(features);
4140 }
84bf3950
YZ		 4141 }
4142
e1c9788c 4143 if (msg_version >= 5) {
ea16567f
LH		 4144 u32 flags, len;
4145
4146 /* version >= 4 */
4147 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4148 ceph_decode_32_safe(&p, end, len, bad); /* len */
4149 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4150
e1c9788c 4151 /* version >= 5, flags */
ea16567f 4152 ceph_decode_32_safe(&p, end, flags, bad);
e1c9788c 4153 if (flags & CEPH_SESSION_BLOCKLISTED) {
38d46409
XL		 4154 pr_warn_client(cl, "mds%d session blocklisted\n",
4155 session->s_mds);
e1c9788c
KH		 4156 blocklisted = true;
4157 }
4158 }
4159
1d17de95
XL		 4160 if (msg_version >= 6) {
4161 ceph_decode_32_safe(&p, end, cap_auths_num, bad);
4162 doutc(cl, "cap_auths_num %d\n", cap_auths_num);
4163
4164 if (cap_auths_num && op != CEPH_SESSION_OPEN) {
4165 WARN_ON_ONCE(op != CEPH_SESSION_OPEN);
4166 goto skip_cap_auths;
4167 }
4168
4169 cap_auths = kcalloc(cap_auths_num,
4170 sizeof(struct ceph_mds_cap_auth),
4171 GFP_KERNEL);
4172 if (!cap_auths) {
4173 pr_err_client(cl, "No memory for cap_auths\n");
4174 return;
4175 }
4176
4177 for (i = 0; i < cap_auths_num; i++) {
4178 u32 _len, j;
4179
4180 /* struct_v, struct_compat, and struct_len in MDSCapAuth */
4181 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4182
4183 /* struct_v, struct_compat, and struct_len in MDSCapMatch */
4184 ceph_decode_skip_n(&p, end, 2 + sizeof(u32), bad);
4185 ceph_decode_64_safe(&p, end, cap_auths[i].match.uid, bad);
4186 ceph_decode_32_safe(&p, end, _len, bad);
4187 if (_len) {
4188 cap_auths[i].match.gids = kcalloc(_len, sizeof(u32),
4189 GFP_KERNEL);
4190 if (!cap_auths[i].match.gids) {
4191 pr_err_client(cl, "No memory for gids\n");
4192 goto fail;
4193 }
4194
4195 cap_auths[i].match.num_gids = _len;
4196 for (j = 0; j < _len; j++)
4197 ceph_decode_32_safe(&p, end,
4198 cap_auths[i].match.gids[j],
4199 bad);
4200 }
4201
4202 ceph_decode_32_safe(&p, end, _len, bad);
4203 if (_len) {
4204 cap_auths[i].match.path = kcalloc(_len + 1, sizeof(char),
4205 GFP_KERNEL);
4206 if (!cap_auths[i].match.path) {
4207 pr_err_client(cl, "No memory for path\n");
4208 goto fail;
4209 }
4210 ceph_decode_copy(&p, cap_auths[i].match.path, _len);
4211
4212 /* Remove the tailing '/' */
4213 while (_len && cap_auths[i].match.path[_len - 1] == '/') {
4214 cap_auths[i].match.path[_len - 1] = '\0';
4215 _len -= 1;
4216 }
4217 }
4218
4219 ceph_decode_32_safe(&p, end, _len, bad);
4220 if (_len) {
4221 cap_auths[i].match.fs_name = kcalloc(_len + 1, sizeof(char),
4222 GFP_KERNEL);
4223 if (!cap_auths[i].match.fs_name) {
4224 pr_err_client(cl, "No memory for fs_name\n");
4225 goto fail;
4226 }
4227 ceph_decode_copy(&p, cap_auths[i].match.fs_name, _len);
4228 }
4229
4230 ceph_decode_8_safe(&p, end, cap_auths[i].match.root_squash, bad);
4231 ceph_decode_8_safe(&p, end, cap_auths[i].readable, bad);
4232 ceph_decode_8_safe(&p, end, cap_auths[i].writeable, bad);
4233 doutc(cl, "uid %lld, num_gids %u, path %s, fs_name %s, root_squash %d, readable %d, writeable %d\n",
4234 cap_auths[i].match.uid, cap_auths[i].match.num_gids,
4235 cap_auths[i].match.path, cap_auths[i].match.fs_name,
4236 cap_auths[i].match.root_squash,
4237 cap_auths[i].readable, cap_auths[i].writeable);
4238 }
4239 }
4240
4241skip_cap_auths:
2f2dc053 4242 mutex_lock(&mdsc->mutex);
1d17de95
XL		 4243 if (op == CEPH_SESSION_OPEN) {
4244 if (mdsc->s_cap_auths) {
4245 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
4246 kfree(mdsc->s_cap_auths[i].match.gids);
4247 kfree(mdsc->s_cap_auths[i].match.path);
4248 kfree(mdsc->s_cap_auths[i].match.fs_name);
4249 }
4250 kfree(mdsc->s_cap_auths);
4251 }
4252 mdsc->s_cap_auths_num = cap_auths_num;
4253 mdsc->s_cap_auths = cap_auths;
4254 }
0a07fc8c 4255 if (op == CEPH_SESSION_CLOSE) {
5b3248c6 4256 ceph_get_mds_session(session);
2600d2dd 4257 __unregister_session(mdsc, session);
0a07fc8c 4258 }
2f2dc053
SW		 4259 /* FIXME: this ttl calculation is generous */
4260 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4261 mutex_unlock(&mdsc->mutex);
4262
4263 mutex_lock(&session->s_mutex);
4264
38d46409
XL		 4265 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4266 ceph_session_op_name(op), session,
4267 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 4268
4269 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4270 session->s_state = CEPH_MDS_SESSION_OPEN;
38d46409 4271 pr_info_client(cl, "mds%d came back\n", session->s_mds);
2f2dc053
SW		 4272 }
4273
4274 switch (op) {
4275 case CEPH_SESSION_OPEN:
29790f26 4276 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4277 pr_info_client(cl, "mds%d reconnect success\n",
4278 session->s_mds);
300e42a2 4279
f48e0342 4280 session->s_features = features;
300e42a2 4281 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
38d46409
XL		 4282 pr_notice_client(cl, "mds%d is already opened\n",
4283 session->s_mds);
300e42a2
XL		 4284 } else {
4285 session->s_state = CEPH_MDS_SESSION_OPEN;
300e42a2
XL		 4286 renewed_caps(mdsc, session, 0);
4287 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4288 &session->s_features))
4289 metric_schedule_delayed(&mdsc->metric);
4290 }
4291
4292 /*
4293 * The connection maybe broken and the session in client
4294 * side has been reinitialized, need to update the seq
4295 * anyway.
4296 */
4297 if (!session->s_seq && seq)
4298 session->s_seq = seq;
4299
2f2dc053
SW		 4300 wake = 1;
4301 if (mdsc->stopping)
4302 __close_session(mdsc, session);
4303 break;
4304
4305 case CEPH_SESSION_RENEWCAPS:
4306 if (session->s_renew_seq == seq)
4307 renewed_caps(mdsc, session, 1);
4308 break;
4309
4310 case CEPH_SESSION_CLOSE:
29790f26 4311 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4312 pr_info_client(cl, "mds%d reconnect denied\n",
4313 session->s_mds);
4d681c2f 4314 session->s_state = CEPH_MDS_SESSION_CLOSED;
1c841a96 4315 cleanup_session_requests(mdsc, session);
2f2dc053 4316 remove_session_caps(session);
656e4382 4317 wake = 2; /* for good measure */
f3c60c59 4318 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 4319 break;
4320
4321 case CEPH_SESSION_STALE:
38d46409
XL		 4322 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4323 session->s_mds);
52d60f8e 4324 atomic_inc(&session->s_cap_gen);
1ce208a6 4325 session->s_cap_ttl = jiffies - 1;
2f2dc053
SW		 4326 send_renew_caps(mdsc, session);
4327 break;
4328
4329 case CEPH_SESSION_RECALL_STATE:
e30ee581 4330 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 4331 break;
4332
186e4f7a 4333 case CEPH_SESSION_FLUSHMSG:
e7d84c6a
XL		 4334 /* flush cap releases */
4335 spin_lock(&session->s_cap_lock);
4336 if (session->s_num_cap_releases)
c085f6ca 4337 ceph_flush_session_cap_releases(mdsc, session);
e7d84c6a
XL		 4338 spin_unlock(&session->s_cap_lock);
4339
186e4f7a
YZ		 4340 send_flushmsg_ack(mdsc, session, seq);
4341 break;
4342
03f4fcb0 4343 case CEPH_SESSION_FORCE_RO:
38d46409 4344 doutc(cl, "force_session_readonly %p\n", session);
03f4fcb0
YZ		 4345 spin_lock(&session->s_cap_lock);
4346 session->s_readonly = true;
4347 spin_unlock(&session->s_cap_lock);
d2f8bb27 4348 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 4349 break;
4350
fcff415c
YZ		 4351 case CEPH_SESSION_REJECT:
4352 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
38d46409
XL		 4353 pr_info_client(cl, "mds%d rejected session\n",
4354 session->s_mds);
fcff415c
YZ		 4355 session->s_state = CEPH_MDS_SESSION_REJECTED;
4356 cleanup_session_requests(mdsc, session);
4357 remove_session_caps(session);
0b98acd6
ID		 4358 if (blocklisted)
4359 mdsc->fsc->blocklisted = true;
fcff415c
YZ		 4360 wake = 2; /* for good measure */
4361 break;
4362
2f2dc053 4363 default:
38d46409 4364 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
2f2dc053
SW		 4365 WARN_ON(1);
4366 }
4367
4368 mutex_unlock(&session->s_mutex);
4369 if (wake) {
4370 mutex_lock(&mdsc->mutex);
4371 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 4372 if (wake == 2)
4373 kick_requests(mdsc, mds);
2f2dc053
SW		 4374 mutex_unlock(&mdsc->mutex);
4375 }
0a07fc8c
YZ		 4376 if (op == CEPH_SESSION_CLOSE)
4377 ceph_put_mds_session(session);
2f2dc053
SW		 4378 return;
4379
4380bad:
38d46409
XL		 4381 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4382 (int)msg->front.iov_len);
9ec7cab1 4383 ceph_msg_dump(msg);
1d17de95
XL		 4384fail:
4385 for (i = 0; i < cap_auths_num; i++) {
4386 kfree(cap_auths[i].match.gids);
4387 kfree(cap_auths[i].match.path);
4388 kfree(cap_auths[i].match.fs_name);
4389 }
4390 kfree(cap_auths);
2f2dc053
SW		 4391 return;
4392}
4393
a25949b9
JL		 4394void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4395{
38d46409 4396 struct ceph_client *cl = req->r_mdsc->fsc->client;
a25949b9
JL		 4397 int dcaps;
4398
4399 dcaps = xchg(&req->r_dir_caps, 0);
4400 if (dcaps) {
38d46409 4401 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
a25949b9
JL		 4402 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4403 }
4404}
4405
07045648 4406void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req)
e64f44a8 4407{
38d46409 4408 struct ceph_client *cl = req->r_mdsc->fsc->client;
e64f44a8
XL		 4409 int dcaps;
4410
4411 dcaps = xchg(&req->r_dir_caps, 0);
4412 if (dcaps) {
38d46409 4413 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
07045648 4414 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps);
e64f44a8
XL		 4415 }
4416}
4417
2f2dc053
SW		 4418/*
4419 * called under session->mutex.
4420 */
4421static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4422 struct ceph_mds_session *session)
4423{
4424 struct ceph_mds_request *req, *nreq;
3de22be6 4425 struct rb_node *p;
2f2dc053 4426
38d46409 4427 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
2f2dc053
SW		 4428
4429 mutex_lock(&mdsc->mutex);
9cf54563 4430 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
396bd62c 4431 __send_request(session, req, true);
3de22be6
YZ		 4432
4433 /*
4434 * also re-send old requests when MDS enters reconnect stage. So that MDS
4435 * can process completed request in clientreplay stage.
4436 */
4437 p = rb_first(&mdsc->request_tree);
4438 while (p) {
4439 req = rb_entry(p, struct ceph_mds_request, r_node);
4440 p = rb_next(p);
bc2de10d 4441 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 4442 continue;
4443 if (req->r_attempts == 0)
4444 continue; /* only old requests */
a25949b9
JL		 4445 if (!req->r_session)
4446 continue;
4447 if (req->r_session->s_mds != session->s_mds)
4448 continue;
4449
07045648 4450 ceph_mdsc_release_dir_caps_async(req);
a25949b9 4451
396bd62c 4452 __send_request(session, req, true);
3de22be6 4453 }
2f2dc053
SW		 4454 mutex_unlock(&mdsc->mutex);
4455}
4456
81c5a148
YZ		 4457static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4458{
4459 struct ceph_msg *reply;
4460 struct ceph_pagelist *_pagelist;
4461 struct page *page;
4462 __le32 *addr;
4463 int err = -ENOMEM;
4464
4465 if (!recon_state->allow_multi)
4466 return -ENOSPC;
4467
4468 /* can't handle message that contains both caps and realm */
4469 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4470
4471 /* pre-allocate new pagelist */
4472 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4473 if (!_pagelist)
4474 return -ENOMEM;
4475
4476 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4477 if (!reply)
4478 goto fail_msg;
4479
4480 /* placeholder for nr_caps */
4481 err = ceph_pagelist_encode_32(_pagelist, 0);
4482 if (err < 0)
4483 goto fail;
4484
4485 if (recon_state->nr_caps) {
4486 /* currently encoding caps */
4487 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4488 if (err)
4489 goto fail;
4490 } else {
4491 /* placeholder for nr_realms (currently encoding relams) */
4492 err = ceph_pagelist_encode_32(_pagelist, 0);
4493 if (err < 0)
4494 goto fail;
4495 }
4496
4497 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4498 if (err)
4499 goto fail;
4500
4501 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4502 addr = kmap_atomic(page);
4503 if (recon_state->nr_caps) {
4504 /* currently encoding caps */
4505 *addr = cpu_to_le32(recon_state->nr_caps);
4506 } else {
4507 /* currently encoding relams */
4508 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4509 }
4510 kunmap_atomic(addr);
4511
4512 reply->hdr.version = cpu_to_le16(5);
4513 reply->hdr.compat_version = cpu_to_le16(4);
4514
4515 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4516 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4517
4518 ceph_con_send(&recon_state->session->s_con, reply);
4519 ceph_pagelist_release(recon_state->pagelist);
4520
4521 recon_state->pagelist = _pagelist;
4522 recon_state->nr_caps = 0;
4523 recon_state->nr_realms = 0;
4524 recon_state->msg_version = 5;
4525 return 0;
4526fail:
4527 ceph_msg_put(reply);
4528fail_msg:
4529 ceph_pagelist_release(_pagelist);
4530 return err;
4531}
4532
a33f6432
YZ		 4533static struct dentry* d_find_primary(struct inode *inode)
4534{
4535 struct dentry *alias, *dn = NULL;
4536
4537 if (hlist_empty(&inode->i_dentry))
4538 return NULL;
4539
4540 spin_lock(&inode->i_lock);
4541 if (hlist_empty(&inode->i_dentry))
4542 goto out_unlock;
4543
4544 if (S_ISDIR(inode->i_mode)) {
4545 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4546 if (!IS_ROOT(alias))
4547 dn = dget(alias);
4548 goto out_unlock;
4549 }
4550
4551 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4552 spin_lock(&alias->d_lock);
4553 if (!d_unhashed(alias) &&
4554 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4555 dn = dget_dlock(alias);
4556 }
4557 spin_unlock(&alias->d_lock);
4558 if (dn)
4559 break;
4560 }
4561out_unlock:
4562 spin_unlock(&inode->i_lock);
4563 return dn;
4564}
4565
2f2dc053
SW		 4566/*
4567 * Encode information about a cap for a reconnect with the MDS.
4568 */
aaf67de7 4569static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 4570{
197b7d79 4571 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 4572 struct ceph_client *cl = ceph_inode_to_client(inode);
20cb34ae
SW		 4573 union {
4574 struct ceph_mds_cap_reconnect v2;
4575 struct ceph_mds_cap_reconnect_v1 v1;
4576 } rec;
aaf67de7 4577 struct ceph_inode_info *ci = ceph_inode(inode);
20cb34ae
SW		 4578 struct ceph_reconnect_state *recon_state = arg;
4579 struct ceph_pagelist *pagelist = recon_state->pagelist;
a33f6432 4580 struct dentry *dentry;
aaf67de7 4581 struct ceph_cap *cap;
a33f6432 4582 char *path;
9aaa7eb0 4583 int pathlen = 0, err;
a33f6432 4584 u64 pathbase;
3469ed0d 4585 u64 snap_follows;
2f2dc053 4586
a33f6432
YZ		 4587 dentry = d_find_primary(inode);
4588 if (dentry) {
4589 /* set pathbase to parent dir when msg_version >= 2 */
197b7d79 4590 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
a33f6432
YZ		 4591 recon_state->msg_version >= 2);
4592 dput(dentry);
4593 if (IS_ERR(path)) {
4594 err = PTR_ERR(path);
4595 goto out_err;
4596 }
4597 } else {
4598 path = NULL;
a33f6432
YZ		 4599 pathbase = 0;
4600 }
4601
be655596 4602 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 4603 cap = __get_cap_for_mds(ci, mds);
4604 if (!cap) {
4605 spin_unlock(&ci->i_ceph_lock);
9aaa7eb0 4606 err = 0;
aaf67de7
XL		 4607 goto out_err;
4608 }
38d46409
XL		 4609 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4610 ceph_vinop(inode), cap, cap->cap_id,
4611 ceph_cap_string(cap->issued));
aaf67de7 4612
2f2dc053
SW		 4613 cap->seq = 0; /* reset cap seq */
4614 cap->issue_seq = 0; /* and issue_seq */
667ca05c 4615 cap->mseq = 0; /* and migrate_seq */
52d60f8e 4616 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
20cb34ae 4617
a25949b9 4618 /* These are lost when the session goes away */
785892fe
JL		 4619 if (S_ISDIR(inode->i_mode)) {
4620 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4621 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4622 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4623 }
a25949b9 4624 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
785892fe 4625 }
a25949b9 4626
121f22a1 4627 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 4628 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4629 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4630 rec.v2.issued = cpu_to_le32(cap->issued);
4631 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4632 rec.v2.pathbase = cpu_to_le64(pathbase);
ec1dff25
JL		 4633 rec.v2.flock_len = (__force __le32)
4634 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae 4635 } else {
c453bdb5
JL		 4636 struct timespec64 ts;
4637
20cb34ae
SW		 4638 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4639 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4640 rec.v1.issued = cpu_to_le32(cap->issued);
2d6795fb 4641 rec.v1.size = cpu_to_le64(i_size_read(inode));
c453bdb5
JL		 4642 ts = inode_get_mtime(inode);
4643 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4644 ts = inode_get_atime(inode);
4645 ceph_encode_timespec64(&rec.v1.atime, &ts);
20cb34ae 4646 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4647 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 4648 }
3469ed0d
YZ		 4649
4650 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 4651 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 4652 } else {
4653 struct ceph_cap_snap *capsnap =
4654 list_first_entry(&ci->i_cap_snaps,
4655 struct ceph_cap_snap, ci_item);
4656 snap_follows = capsnap->follows;
20cb34ae 4657 }
be655596 4658 spin_unlock(&ci->i_ceph_lock);
2f2dc053 4659
121f22a1 4660 if (recon_state->msg_version >= 2) {
40819f6f 4661 int num_fcntl_locks, num_flock_locks;
4deb14a2 4662 struct ceph_filelock *flocks = NULL;
81c5a148 4663 size_t struct_len, total_len = sizeof(u64);
121f22a1 4664 u8 struct_v = 0;
39be95e9
JS		 4665
4666encode_again:
b3f8d68f
YZ		 4667 if (rec.v2.flock_len) {
4668 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4669 } else {
4670 num_fcntl_locks = 0;
4671 num_flock_locks = 0;
4672 }
4deb14a2 4673 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 4674 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4675 sizeof(struct ceph_filelock),
4676 GFP_NOFS);
4deb14a2
YZ		 4677 if (!flocks) {
4678 err = -ENOMEM;
5ccedf1c 4679 goto out_err;
4deb14a2
YZ		 4680 }
4681 err = ceph_encode_locks_to_buffer(inode, flocks,
4682 num_fcntl_locks,
4683 num_flock_locks);
4684 if (err) {
4685 kfree(flocks);
4686 flocks = NULL;
4687 if (err == -ENOSPC)
4688 goto encode_again;
5ccedf1c 4689 goto out_err;
4deb14a2
YZ		 4690 }
4691 } else {
39be95e9 4692 kfree(flocks);
4deb14a2 4693 flocks = NULL;
39be95e9 4694 }
121f22a1
YZ		 4695
4696 if (recon_state->msg_version >= 3) {
4697 /* version, compat_version and struct_len */
81c5a148 4698 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 4699 struct_v = 2;
121f22a1 4700 }
39be95e9
JS		 4701 /*
4702 * number of encoded locks is stable, so copy to pagelist
4703 */
121f22a1
YZ		 4704 struct_len = 2 * sizeof(u32) +
4705 (num_fcntl_locks + num_flock_locks) *
4706 sizeof(struct ceph_filelock);
4707 rec.v2.flock_len = cpu_to_le32(struct_len);
4708
a33f6432 4709 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
121f22a1 4710
3469ed0d
YZ		 4711 if (struct_v >= 2)
4712 struct_len += sizeof(u64); /* snap_follows */
4713
121f22a1 4714 total_len += struct_len;
81c5a148
YZ		 4715
4716 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4717 err = send_reconnect_partial(recon_state);
4718 if (err)
4719 goto out_freeflocks;
4720 pagelist = recon_state->pagelist;
5ccedf1c 4721 }
121f22a1 4722
81c5a148
YZ		 4723 err = ceph_pagelist_reserve(pagelist, total_len);
4724 if (err)
4725 goto out_freeflocks;
4726
4727 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4728 if (recon_state->msg_version >= 3) {
4729 ceph_pagelist_encode_8(pagelist, struct_v);
4730 ceph_pagelist_encode_8(pagelist, 1);
4731 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 4732 }
a33f6432 4733 ceph_pagelist_encode_string(pagelist, path, pathlen);
5ccedf1c
YZ		 4734 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4735 ceph_locks_to_pagelist(flocks, pagelist,
4736 num_fcntl_locks, num_flock_locks);
4737 if (struct_v >= 2)
4738 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 4739out_freeflocks:
39be95e9 4740 kfree(flocks);
3612abbd 4741 } else {
5ccedf1c 4742 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 4743 sizeof(u64) + sizeof(u32) +
4744 pathlen + sizeof(rec.v1));
a33f6432
YZ		 4745 if (err)
4746 goto out_err;
5ccedf1c 4747
81c5a148 4748 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4749 ceph_pagelist_encode_string(pagelist, path, pathlen);
4750 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
40819f6f 4751 }
44c99757 4752
5ccedf1c 4753out_err:
a33f6432
YZ		 4754 ceph_mdsc_free_path(path, pathlen);
4755 if (!err)
81c5a148
YZ		 4756 recon_state->nr_caps++;
4757 return err;
4758}
4759
4760static int encode_snap_realms(struct ceph_mds_client *mdsc,
4761 struct ceph_reconnect_state *recon_state)
4762{
4763 struct rb_node *p;
4764 struct ceph_pagelist *pagelist = recon_state->pagelist;
38d46409 4765 struct ceph_client *cl = mdsc->fsc->client;
81c5a148
YZ		 4766 int err = 0;
4767
4768 if (recon_state->msg_version >= 4) {
4769 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4770 if (err < 0)
4771 goto fail;
4772 }
4773
4774 /*
4775 * snaprealms. we provide mds with the ino, seq (version), and
4776 * parent for all of our realms. If the mds has any newer info,
4777 * it will tell us.
4778 */
4779 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4780 struct ceph_snap_realm *realm =
4781 rb_entry(p, struct ceph_snap_realm, node);
4782 struct ceph_mds_snaprealm_reconnect sr_rec;
4783
4784 if (recon_state->msg_version >= 4) {
4785 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4786 sizeof(sr_rec);
4787
4788 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4789 err = send_reconnect_partial(recon_state);
4790 if (err)
4791 goto fail;
4792 pagelist = recon_state->pagelist;
4793 }
4794
4795 err = ceph_pagelist_reserve(pagelist, need);
4796 if (err)
4797 goto fail;
4798
4799 ceph_pagelist_encode_8(pagelist, 1);
4800 ceph_pagelist_encode_8(pagelist, 1);
4801 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4802 }
4803
38d46409
XL		 4804 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4805 realm->ino, realm->seq, realm->parent_ino);
81c5a148
YZ		 4806 sr_rec.ino = cpu_to_le64(realm->ino);
4807 sr_rec.seq = cpu_to_le64(realm->seq);
4808 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4809
4810 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4811 if (err)
4812 goto fail;
4813
4814 recon_state->nr_realms++;
4815 }
4816fail:
93cea5be 4817 return err;
2f2dc053
SW		 4818}
4819
4820
4821/*
4822 * If an MDS fails and recovers, clients need to reconnect in order to
4823 * reestablish shared state. This includes all caps issued through
4824 * this session _and_ the snap_realm hierarchy. Because it's not
4825 * clear which snap realms the mds cares about, we send everything we
4826 * know about.. that ensures we'll then get any new info the
4827 * recovering MDS might have.
4828 *
4829 * This is a relatively heavyweight operation, but it's rare.
2f2dc053 4830 */
34b6c855
SW		 4831static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4832 struct ceph_mds_session *session)
2f2dc053 4833{
38d46409 4834 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4835 struct ceph_msg *reply;
34b6c855 4836 int mds = session->s_mds;
9abf82b8 4837 int err = -ENOMEM;
81c5a148
YZ		 4838 struct ceph_reconnect_state recon_state = {
4839 .session = session,
4840 };
c8a96a31 4841 LIST_HEAD(dispose);
2f2dc053 4842
38d46409 4843 pr_info_client(cl, "mds%d reconnect start\n", mds);
2f2dc053 4844
81c5a148
YZ		 4845 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4846 if (!recon_state.pagelist)
93cea5be 4847 goto fail_nopagelist;
93cea5be 4848
0d9c1ab3 4849 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 4850 if (!reply)
93cea5be 4851 goto fail_nomsg;
93cea5be 4852
d4846487
JL		 4853 xa_destroy(&session->s_delegated_inos);
4854
34b6c855
SW		 4855 mutex_lock(&session->s_mutex);
4856 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4857 session->s_seq = 0;
2f2dc053 4858
38d46409
XL		 4859 doutc(cl, "session %p state %s\n", session,
4860 ceph_session_state_name(session->s_state));
2f2dc053 4861
52d60f8e 4862 atomic_inc(&session->s_cap_gen);
99a9c273
YZ		 4863
4864 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 4865 /* don't know if session is readonly */
4866 session->s_readonly = 0;
99a9c273
YZ		 4867 /*
4868 * notify __ceph_remove_cap() that we are composing cap reconnect.
4869 * If a cap get released before being added to the cap reconnect,
4870 * __ceph_remove_cap() should skip queuing cap release.
4871 */
4872 session->s_cap_reconnect = 1;
e01a5946 4873 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 4874 detach_cap_releases(session, &dispose);
4875 spin_unlock(&session->s_cap_lock);
4876 dispose_cap_releases(mdsc, &dispose);
e01a5946 4877
5d23371f 4878 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 4879 if (mdsc->fsc->sb->s_root)
4880 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 4881
4882 ceph_con_close(&session->s_con);
4883 ceph_con_open(&session->s_con,
4884 CEPH_ENTITY_TYPE_MDS, mds,
4885 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4886
4887 /* replay unsafe requests */
4888 replay_unsafe_requests(mdsc, session);
4889
81c5a148
YZ		 4890 ceph_early_kick_flushing_caps(mdsc, session);
4891
5d23371f
YZ		 4892 down_read(&mdsc->snap_rwsem);
4893
81c5a148
YZ		 4894 /* placeholder for nr_caps */
4895 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 4896 if (err)
4897 goto fail;
20cb34ae 4898
81c5a148 4899 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 4900 recon_state.msg_version = 3;
81c5a148
YZ		 4901 recon_state.allow_multi = true;
4902 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4903 recon_state.msg_version = 3;
4904 } else {
23c625ce 4905 recon_state.msg_version = 2;
81c5a148 4906 }
0039aebf 4907 /* traverse this session's caps */
a25949b9 4908 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
2f2dc053 4909
99a9c273
YZ		 4910 spin_lock(&session->s_cap_lock);
4911 session->s_cap_reconnect = 0;
4912 spin_unlock(&session->s_cap_lock);
4913
81c5a148
YZ		 4914 if (err < 0)
4915 goto fail;
2f2dc053 4916
81c5a148
YZ		 4917 /* check if all realms can be encoded into current message */
4918 if (mdsc->num_snap_realms) {
4919 size_t total_len =
4920 recon_state.pagelist->length +
4921 mdsc->num_snap_realms *
4922 sizeof(struct ceph_mds_snaprealm_reconnect);
4923 if (recon_state.msg_version >= 4) {
4924 /* number of realms */
4925 total_len += sizeof(u32);
4926 /* version, compat_version and struct_len */
4927 total_len += mdsc->num_snap_realms *
4928 (2 * sizeof(u8) + sizeof(u32));
4929 }
4930 if (total_len > RECONNECT_MAX_SIZE) {
4931 if (!recon_state.allow_multi) {
4932 err = -ENOSPC;
4933 goto fail;
4934 }
4935 if (recon_state.nr_caps) {
4936 err = send_reconnect_partial(&recon_state);
4937 if (err)
4938 goto fail;
4939 }
4940 recon_state.msg_version = 5;
4941 }
2f2dc053 4942 }
2f2dc053 4943
81c5a148
YZ		 4944 err = encode_snap_realms(mdsc, &recon_state);
4945 if (err < 0)
4946 goto fail;
4947
4948 if (recon_state.msg_version >= 5) {
4949 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4950 if (err < 0)
4951 goto fail;
4952 }
44c99757 4953
81c5a148
YZ		 4954 if (recon_state.nr_caps || recon_state.nr_realms) {
4955 struct page *page =
4956 list_first_entry(&recon_state.pagelist->head,
4957 struct page, lru);
44c99757 4958 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 4959 if (recon_state.nr_caps) {
4960 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4961 *addr = cpu_to_le32(recon_state.nr_caps);
4962 } else if (recon_state.msg_version >= 4) {
4963 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4964 }
44c99757 4965 kunmap_atomic(addr);
ebf18f47 4966 }
44c99757 4967
81c5a148
YZ		 4968 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4969 if (recon_state.msg_version >= 4)
4970 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 4971
81c5a148
YZ		 4972 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4973 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 4974
2f2dc053
SW		 4975 ceph_con_send(&session->s_con, reply);
4976
9abf82b8
SW		 4977 mutex_unlock(&session->s_mutex);
4978
4979 mutex_lock(&mdsc->mutex);
4980 __wake_requests(mdsc, &session->s_waiting);
4981 mutex_unlock(&mdsc->mutex);
4982
2f2dc053 4983 up_read(&mdsc->snap_rwsem);
81c5a148 4984 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 4985 return;
4986
93cea5be 4987fail:
2f2dc053 4988 ceph_msg_put(reply);
9abf82b8
SW		 4989 up_read(&mdsc->snap_rwsem);
4990 mutex_unlock(&session->s_mutex);
93cea5be 4991fail_nomsg:
81c5a148 4992 ceph_pagelist_release(recon_state.pagelist);
93cea5be 4993fail_nopagelist:
38d46409
XL		 4994 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
4995 err, mds);
9abf82b8 4996 return;
2f2dc053
SW		 4997}
4998
4999
5000/*
5001 * compare old and new mdsmaps, kicking requests
5002 * and closing out old connections as necessary
5003 *
5004 * called under mdsc->mutex.
5005 */
5006static void check_new_map(struct ceph_mds_client *mdsc,
5007 struct ceph_mdsmap *newmap,
5008 struct ceph_mdsmap *oldmap)
5009{
d517b398 5010 int i, j, err;
2f2dc053
SW		 5011 int oldstate, newstate;
5012 struct ceph_mds_session *s;
d517b398 5013 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
38d46409 5014 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 5015
38d46409 5016 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
2f2dc053 5017
d517b398
XL		 5018 if (newmap->m_info) {
5019 for (i = 0; i < newmap->possible_max_rank; i++) {
5020 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
5021 set_bit(newmap->m_info[i].export_targets[j], targets);
5022 }
5023 }
5024
b38c9eb4 5025 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
d37b1d99 5026 if (!mdsc->sessions[i])
2f2dc053
SW		 5027 continue;
5028 s = mdsc->sessions[i];
5029 oldstate = ceph_mdsmap_get_state(oldmap, i);
5030 newstate = ceph_mdsmap_get_state(newmap, i);
5031
38d46409
XL		 5032 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
5033 i, ceph_mds_state_name(oldstate),
5034 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
5035 ceph_mds_state_name(newstate),
5036 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
5037 ceph_session_state_name(s->s_state));
2f2dc053 5038
b38c9eb4 5039 if (i >= newmap->possible_max_rank) {
6f0f597b 5040 /* force close session for stopped mds */
5b3248c6 5041 ceph_get_mds_session(s);
6f0f597b
YZ		 5042 __unregister_session(mdsc, s);
5043 __wake_requests(mdsc, &s->s_waiting);
5044 mutex_unlock(&mdsc->mutex);
2827528d 5045
6f0f597b
YZ		 5046 mutex_lock(&s->s_mutex);
5047 cleanup_session_requests(mdsc, s);
5048 remove_session_caps(s);
5049 mutex_unlock(&s->s_mutex);
2827528d 5050
6f0f597b 5051 ceph_put_mds_session(s);
2827528d 5052
6f0f597b
YZ		 5053 mutex_lock(&mdsc->mutex);
5054 kick_requests(mdsc, i);
5055 continue;
5056 }
5057
5058 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
5059 ceph_mdsmap_get_addr(newmap, i),
5060 sizeof(struct ceph_entity_addr))) {
5061 /* just close it */
5062 mutex_unlock(&mdsc->mutex);
5063 mutex_lock(&s->s_mutex);
5064 mutex_lock(&mdsc->mutex);
5065 ceph_con_close(&s->s_con);
5066 mutex_unlock(&s->s_mutex);
5067 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 5068 } else if (oldstate == newstate) {
5069 continue; /* nothing new with this mds */
5070 }
5071
5072 /*
5073 * send reconnect?
5074 */
5075 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 5076 newstate >= CEPH_MDS_STATE_RECONNECT) {
5077 mutex_unlock(&mdsc->mutex);
d517b398 5078 clear_bit(i, targets);
34b6c855
SW		 5079 send_mds_reconnect(mdsc, s);
5080 mutex_lock(&mdsc->mutex);
5081 }
2f2dc053
SW		 5082
5083 /*
29790f26 5084 * kick request on any mds that has gone active.
2f2dc053
SW		 5085 */
5086 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
5087 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 5088 if (oldstate != CEPH_MDS_STATE_CREATING &&
5089 oldstate != CEPH_MDS_STATE_STARTING)
38d46409
XL		 5090 pr_info_client(cl, "mds%d recovery completed\n",
5091 s->s_mds);
29790f26 5092 kick_requests(mdsc, i);
ea8412b2 5093 mutex_unlock(&mdsc->mutex);
829ad4db 5094 mutex_lock(&s->s_mutex);
ea8412b2 5095 mutex_lock(&mdsc->mutex);
2f2dc053 5096 ceph_kick_flushing_caps(mdsc, s);
829ad4db 5097 mutex_unlock(&s->s_mutex);
d2f8bb27 5098 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 5099 }
5100 }
cb170a22 5101
d517b398
XL		 5102 /*
5103 * Only open and reconnect sessions that don't exist yet.
5104 */
5105 for (i = 0; i < newmap->possible_max_rank; i++) {
5106 /*
5107 * In case the import MDS is crashed just after
5108 * the EImportStart journal is flushed, so when
5109 * a standby MDS takes over it and is replaying
5110 * the EImportStart journal the new MDS daemon
5111 * will wait the client to reconnect it, but the
5112 * client may never register/open the session yet.
5113 *
5114 * Will try to reconnect that MDS daemon if the
5115 * rank number is in the export targets array and
5116 * is the up:reconnect state.
5117 */
5118 newstate = ceph_mdsmap_get_state(newmap, i);
5119 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
5120 continue;
5121
5122 /*
5123 * The session maybe registered and opened by some
5124 * requests which were choosing random MDSes during
5125 * the mdsc->mutex's unlock/lock gap below in rare
5126 * case. But the related MDS daemon will just queue
5127 * that requests and be still waiting for the client's
5128 * reconnection request in up:reconnect state.
5129 */
5130 s = __ceph_lookup_mds_session(mdsc, i);
5131 if (likely(!s)) {
5132 s = __open_export_target_session(mdsc, i);
5133 if (IS_ERR(s)) {
5134 err = PTR_ERR(s);
38d46409
XL		 5135 pr_err_client(cl,
5136 "failed to open export target session, err %d\n",
5137 err);
d517b398
XL		 5138 continue;
5139 }
5140 }
38d46409 5141 doutc(cl, "send reconnect to export target mds.%d\n", i);
d517b398
XL		 5142 mutex_unlock(&mdsc->mutex);
5143 send_mds_reconnect(mdsc, s);
5144 ceph_put_mds_session(s);
5145 mutex_lock(&mdsc->mutex);
5146 }
5147
b38c9eb4 5148 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
cb170a22
SW		 5149 s = mdsc->sessions[i];
5150 if (!s)
5151 continue;
5152 if (!ceph_mdsmap_is_laggy(newmap, i))
5153 continue;
5154 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5155 s->s_state == CEPH_MDS_SESSION_HUNG ||
5156 s->s_state == CEPH_MDS_SESSION_CLOSING) {
38d46409 5157 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
cb170a22
SW		 5158 __open_export_target_sessions(mdsc, s);
5159 }
5160 }
2f2dc053
SW		 5161}
5162
5163
5164
5165/*
5166 * leases
5167 */
5168
5169/*
5170 * caller must hold session s_mutex, dentry->d_lock
5171 */
5172void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5173{
5174 struct ceph_dentry_info *di = ceph_dentry(dentry);
5175
5176 ceph_put_mds_session(di->lease_session);
5177 di->lease_session = NULL;
5178}
5179
2600d2dd
SW		 5180static void handle_lease(struct ceph_mds_client *mdsc,
5181 struct ceph_mds_session *session,
5182 struct ceph_msg *msg)
2f2dc053 5183{
38d46409 5184 struct ceph_client *cl = mdsc->fsc->client;
3d14c5d2 5185 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 5186 struct inode *inode;
2f2dc053
SW		 5187 struct dentry *parent, *dentry;
5188 struct ceph_dentry_info *di;
2600d2dd 5189 int mds = session->s_mds;
2f2dc053 5190 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 5191 u32 seq;
2f2dc053 5192 struct ceph_vino vino;
2f2dc053
SW		 5193 struct qstr dname;
5194 int release = 0;
5195
38d46409 5196 doutc(cl, "from mds%d\n", mds);
2f2dc053 5197
e3dfcab2
XL		 5198 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5199 return;
5200
2f2dc053
SW		 5201 /* decode */
5202 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5203 goto bad;
5204 vino.ino = le64_to_cpu(h->ino);
5205 vino.snap = CEPH_NOSNAP;
1e5ea23d 5206 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 5207 dname.len = get_unaligned_le32(h + 1);
5208 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 5209 goto bad;
0fcf6c02 5210 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 5211
2f2dc053
SW		 5212 /* lookup inode */
5213 inode = ceph_find_inode(sb, vino);
38d46409
XL		 5214 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5215 vino.ino, inode, dname.len, dname.name);
6cd3bcad
YZ		 5216
5217 mutex_lock(&session->s_mutex);
d37b1d99 5218 if (!inode) {
38d46409 5219 doutc(cl, "no inode %llx\n", vino.ino);
2f2dc053
SW		 5220 goto release;
5221 }
2f2dc053
SW		 5222
5223 /* dentry */
5224 parent = d_find_alias(inode);
5225 if (!parent) {
38d46409 5226 doutc(cl, "no parent dentry on inode %p\n", inode);
2f2dc053
SW		 5227 WARN_ON(1);
5228 goto release; /* hrm... */
5229 }
8387ff25 5230 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 5231 dentry = d_lookup(parent, &dname);
5232 dput(parent);
5233 if (!dentry)
5234 goto release;
5235
5236 spin_lock(&dentry->d_lock);
5237 di = ceph_dentry(dentry);
5238 switch (h->action) {
5239 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 5240 if (di->lease_session == session) {
1e5ea23d
SW		 5241 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5242 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 5243 __ceph_mdsc_drop_dentry_lease(dentry);
5244 }
5245 release = 1;
5246 break;
5247
5248 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 5249 if (di->lease_session == session &&
52d60f8e 5250 di->lease_gen == atomic_read(&session->s_cap_gen) &&
2f2dc053
SW		 5251 di->lease_renew_from &&
5252 di->lease_renew_after == 0) {
5253 unsigned long duration =
3563dbdd 5254 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 5255
1e5ea23d 5256 di->lease_seq = seq;
9b16f03c 5257 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 5258 di->lease_renew_after = di->lease_renew_from +
5259 (duration >> 1);
5260 di->lease_renew_from = 0;
5261 }
5262 break;
5263 }
5264 spin_unlock(&dentry->d_lock);
5265 dput(dentry);
5266
5267 if (!release)
5268 goto out;
5269
5270release:
5271 /* let's just reuse the same message */
5272 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5273 ceph_msg_get(msg);
5274 ceph_con_send(&session->s_con, msg);
5275
5276out:
2f2dc053 5277 mutex_unlock(&session->s_mutex);
23c2c76e 5278 iput(inode);
e3dfcab2
XL		 5279
5280 ceph_dec_mds_stopping_blocker(mdsc);
2f2dc053
SW		 5281 return;
5282
5283bad:
e3dfcab2
XL		 5284 ceph_dec_mds_stopping_blocker(mdsc);
5285
38d46409 5286 pr_err_client(cl, "corrupt lease message\n");
9ec7cab1 5287 ceph_msg_dump(msg);
2f2dc053
SW		 5288}
5289
5290void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 5291 struct dentry *dentry, char action,
5292 u32 seq)
5293{
38d46409 5294 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053
SW		 5295 struct ceph_msg *msg;
5296 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 5297 struct inode *dir;
5298 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 5299
38d46409
XL		 5300 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5301 session->s_mds);
2f2dc053 5302
b61c2763 5303 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 5304 if (!msg)
2f2dc053
SW		 5305 return;
5306 lease = msg->front.iov_base;
5307 lease->action = action;
2f2dc053 5308 lease->seq = cpu_to_le32(seq);
2f2dc053 5309
8f2a98ef
YZ		 5310 spin_lock(&dentry->d_lock);
5311 dir = d_inode(dentry->d_parent);
5312 lease->ino = cpu_to_le64(ceph_ino(dir));
5313 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5314
5315 put_unaligned_le32(dentry->d_name.len, lease + 1);
5316 memcpy((void *)(lease + 1) + 4,
5317 dentry->d_name.name, dentry->d_name.len);
5318 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 5319
5320 ceph_con_send(&session->s_con, msg);
5321}
5322
2f2dc053 5323/*
59b312f3 5324 * lock unlock the session, to wait ongoing session activities
2f2dc053 5325 */
59b312f3 5326static void lock_unlock_session(struct ceph_mds_session *s)
2f2dc053 5327{
59b312f3
XL		 5328 mutex_lock(&s->s_mutex);
5329 mutex_unlock(&s->s_mutex);
2f2dc053
SW		 5330}
5331
131d7eb4
YZ		 5332static void maybe_recover_session(struct ceph_mds_client *mdsc)
5333{
38d46409 5334 struct ceph_client *cl = mdsc->fsc->client;
131d7eb4
YZ		 5335 struct ceph_fs_client *fsc = mdsc->fsc;
5336
5337 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5338 return;
2f2dc053 5339
131d7eb4
YZ		 5340 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5341 return;
5342
0b98acd6 5343 if (!READ_ONCE(fsc->blocklisted))
131d7eb4
YZ		 5344 return;
5345
38d46409 5346 pr_info_client(cl, "auto reconnect after blocklisted\n");
131d7eb4
YZ		 5347 ceph_force_reconnect(fsc->sb);
5348}
2f2dc053 5349
3e699bd8
XL		 5350bool check_session_state(struct ceph_mds_session *s)
5351{
38d46409
XL		 5352 struct ceph_client *cl = s->s_mdsc->fsc->client;
5353
62575e27
JL		 5354 switch (s->s_state) {
5355 case CEPH_MDS_SESSION_OPEN:
5356 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3e699bd8 5357 s->s_state = CEPH_MDS_SESSION_HUNG;
38d46409 5358 pr_info_client(cl, "mds%d hung\n", s->s_mds);
3e699bd8 5359 }
62575e27
JL		 5360 break;
5361 case CEPH_MDS_SESSION_CLOSING:
62575e27
JL		 5362 case CEPH_MDS_SESSION_NEW:
5363 case CEPH_MDS_SESSION_RESTARTING:
5364 case CEPH_MDS_SESSION_CLOSED:
5365 case CEPH_MDS_SESSION_REJECTED:
3e699bd8 5366 return false;
62575e27 5367 }
3e699bd8
XL		 5368
5369 return true;
5370}
5371
62575e27
JL		 5372/*
5373 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5374 * then we need to retransmit that request.
5375 */
5376void inc_session_sequence(struct ceph_mds_session *s)
5377{
38d46409
XL		 5378 struct ceph_client *cl = s->s_mdsc->fsc->client;
5379
62575e27
JL		 5380 lockdep_assert_held(&s->s_mutex);
5381
5382 s->s_seq++;
5383
5384 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5385 int ret;
5386
38d46409 5387 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
62575e27
JL		 5388 ret = request_close_session(s);
5389 if (ret < 0)
38d46409
XL		 5390 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5391 s->s_mds, ret);
62575e27
JL		 5392 }
5393}
5394
2f2dc053 5395/*
bf2ba432
LH		 5396 * delayed work -- periodically trim expired leases, renew caps with mds. If
5397 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5398 * workqueue delay value of 5 secs will be used.
2f2dc053 5399 */
bf2ba432 5400static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
2f2dc053 5401{
bf2ba432
LH		 5402 unsigned long max_delay = HZ * 5;
5403
5404 /* 5 secs default delay */
5405 if (!delay || (delay > max_delay))
5406 delay = max_delay;
5407 schedule_delayed_work(&mdsc->delayed_work,
5408 round_jiffies_relative(delay));
2f2dc053
SW		 5409}
5410
5411static void delayed_work(struct work_struct *work)
5412{
2f2dc053
SW		 5413 struct ceph_mds_client *mdsc =
5414 container_of(work, struct ceph_mds_client, delayed_work.work);
bf2ba432 5415 unsigned long delay;
2f2dc053
SW		 5416 int renew_interval;
5417 int renew_caps;
bf2ba432 5418 int i;
2f2dc053 5419
38d46409 5420 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
75c9627e 5421
e7e607bd 5422 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
fa996773
XL		 5423 return;
5424
2f2dc053
SW		 5425 mutex_lock(&mdsc->mutex);
5426 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5427 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5428 mdsc->last_renew_caps);
5429 if (renew_caps)
5430 mdsc->last_renew_caps = jiffies;
5431
5432 for (i = 0; i < mdsc->max_sessions; i++) {
5433 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 5434 if (!s)
2f2dc053 5435 continue;
3e699bd8
XL		 5436
5437 if (!check_session_state(s)) {
2f2dc053
SW		 5438 ceph_put_mds_session(s);
5439 continue;
5440 }
5441 mutex_unlock(&mdsc->mutex);
5442
c085f6ca 5443 ceph_flush_session_cap_releases(mdsc, s);
578eb54c 5444
2f2dc053
SW		 5445 mutex_lock(&s->s_mutex);
5446 if (renew_caps)
5447 send_renew_caps(mdsc, s);
5448 else
5449 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 5450 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5451 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 5452 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 5453 mutex_unlock(&s->s_mutex);
5454 ceph_put_mds_session(s);
5455
5456 mutex_lock(&mdsc->mutex);
5457 }
5458 mutex_unlock(&mdsc->mutex);
5459
bf2ba432 5460 delay = ceph_check_delayed_caps(mdsc);
37c4efc1
YZ		 5461
5462 ceph_queue_cap_reclaim_work(mdsc);
5463
5464 ceph_trim_snapid_map(mdsc);
5465
131d7eb4
YZ		 5466 maybe_recover_session(mdsc);
5467
bf2ba432 5468 schedule_delayed(mdsc, delay);
2f2dc053
SW		 5469}
5470
3d14c5d2 5471int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 5472
2f2dc053 5473{
3d14c5d2 5474 struct ceph_mds_client *mdsc;
f9009efa 5475 int err;
3d14c5d2
YS		 5476
5477 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5478 if (!mdsc)
5479 return -ENOMEM;
5480 mdsc->fsc = fsc;
2f2dc053
SW		 5481 mutex_init(&mdsc->mutex);
5482 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 5483 if (!mdsc->mdsmap) {
f9009efa
XL		 5484 err = -ENOMEM;
5485 goto err_mdsc;
fb3101b6 5486 }
2d06eeb8 5487
2f2dc053 5488 init_completion(&mdsc->safe_umount_waiters);
e3dfcab2
XL		 5489 spin_lock_init(&mdsc->stopping_lock);
5490 atomic_set(&mdsc->stopping_blockers, 0);
5491 init_completion(&mdsc->stopping_waiter);
fd7449d9
VD		 5492 atomic64_set(&mdsc->dirty_folios, 0);
5493 init_waitqueue_head(&mdsc->flush_end_wq);
f3c60c59 5494 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053 5495 INIT_LIST_HEAD(&mdsc->waiting_for_map);
0c44a8e0
LH		 5496 mdsc->quotarealms_inodes = RB_ROOT;
5497 mutex_init(&mdsc->quotarealms_inodes_mutex);
2f2dc053 5498 init_rwsem(&mdsc->snap_rwsem);
a105f00c 5499 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 5500 INIT_LIST_HEAD(&mdsc->snap_empty);
5501 spin_lock_init(&mdsc->snap_empty_lock);
44ca18f2 5502 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 5503 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5504 mdsc->last_renew_caps = jiffies;
5505 INIT_LIST_HEAD(&mdsc->cap_delay_list);
65d284a3 5506#ifdef CONFIG_DEBUG_FS
3a3430af 5507 INIT_LIST_HEAD(&mdsc->cap_wait_list);
65d284a3 5508#endif
2f2dc053 5509 spin_lock_init(&mdsc->cap_delay_lock);
dbc347ef 5510 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
2f2dc053
SW		 5511 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5512 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 5513 mdsc->last_cap_flush_tid = 1;
e4500b5e 5514 INIT_LIST_HEAD(&mdsc->cap_flush_list);
db354052 5515 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 5516 spin_lock_init(&mdsc->cap_dirty_lock);
5517 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 5518 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
dbc347ef 5519 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work);
f9009efa
XL		 5520 err = ceph_metric_init(&mdsc->metric);
5521 if (err)
5522 goto err_mdsmap;
37c4efc1
YZ		 5523
5524 spin_lock_init(&mdsc->dentry_list_lock);
5525 INIT_LIST_HEAD(&mdsc->dentry_leases);
5526 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 5527
37151668 5528 ceph_caps_init(mdsc);
fe33032d 5529 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 5530
75c9627e
YZ		 5531 spin_lock_init(&mdsc->snapid_map_lock);
5532 mdsc->snapid_map_tree = RB_ROOT;
5533 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5534
10183a69
YZ		 5535 init_rwsem(&mdsc->pool_perm_rwsem);
5536 mdsc->pool_perm_tree = RB_ROOT;
5537
dfeb84d4
YZ		 5538 strscpy(mdsc->nodename, utsname()->nodename,
5539 sizeof(mdsc->nodename));
a7caa88f
XL		 5540
5541 fsc->mdsc = mdsc;
5f44f142 5542 return 0;
f9009efa
XL		 5543
5544err_mdsmap:
5545 kfree(mdsc->mdsmap);
5546err_mdsc:
5547 kfree(mdsc);
5548 return err;
2f2dc053
SW		 5549}
5550
5551/*
5552 * Wait for safe replies on open mds requests. If we time out, drop
5553 * all requests from the tree to avoid dangling dentry refs.
5554 */
5555static void wait_requests(struct ceph_mds_client *mdsc)
5556{
38d46409 5557 struct ceph_client *cl = mdsc->fsc->client;
a319bf56 5558 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 5559 struct ceph_mds_request *req;
2f2dc053
SW		 5560
5561 mutex_lock(&mdsc->mutex);
44ca18f2 5562 if (__get_oldest_req(mdsc)) {
2f2dc053 5563 mutex_unlock(&mdsc->mutex);
44ca18f2 5564
38d46409 5565 doutc(cl, "waiting for requests\n");
2f2dc053 5566 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 5567 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5568
5569 /* tear down remaining requests */
44ca18f2
SW		 5570 mutex_lock(&mdsc->mutex);
5571 while ((req = __get_oldest_req(mdsc))) {
38d46409 5572 doutc(cl, "timed out on tid %llu\n", req->r_tid);
428138c9 5573 list_del_init(&req->r_wait);
44ca18f2 5574 __unregister_request(mdsc, req);
2f2dc053
SW		 5575 }
5576 }
5577 mutex_unlock(&mdsc->mutex);
38d46409 5578 doutc(cl, "done\n");
2f2dc053
SW		 5579}
5580
d095559c
XL		 5581void send_flush_mdlog(struct ceph_mds_session *s)
5582{
38d46409 5583 struct ceph_client *cl = s->s_mdsc->fsc->client;
d095559c
XL		 5584 struct ceph_msg *msg;
5585
5586 /*
5587 * Pre-luminous MDS crashes when it sees an unknown session request
5588 */
5589 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5590 return;
5591
5592 mutex_lock(&s->s_mutex);
38d46409
XL		 5593 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5594 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5595 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5596 s->s_seq);
5597 if (!msg) {
38d46409
XL		 5598 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5599 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5600 } else {
5601 ceph_con_send(&s->s_con, msg);
5602 }
5603 mutex_unlock(&s->s_mutex);
5604}
5605
596afb0b
XL		 5606static int ceph_mds_auth_match(struct ceph_mds_client *mdsc,
5607 struct ceph_mds_cap_auth *auth,
23426309 5608 const struct cred *cred,
596afb0b
XL		 5609 char *tpath)
5610{
596afb0b
XL		 5611 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5612 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5613 struct ceph_client *cl = mdsc->fsc->client;
5614 const char *spath = mdsc->fsc->mount_options->server_path;
5615 bool gid_matched = false;
5616 u32 gid, tlen, len;
5617 int i, j;
5618
5619 doutc(cl, "match.uid %lld\n", auth->match.uid);
5620 if (auth->match.uid != MDS_AUTH_UID_ANY) {
5621 if (auth->match.uid != caller_uid)
5622 return 0;
5623 if (auth->match.num_gids) {
5624 for (i = 0; i < auth->match.num_gids; i++) {
5625 if (caller_gid == auth->match.gids[i])
5626 gid_matched = true;
5627 }
5628 if (!gid_matched && cred->group_info->ngroups) {
5629 for (i = 0; i < cred->group_info->ngroups; i++) {
5630 gid = from_kgid(&init_user_ns,
5631 cred->group_info->gid[i]);
5632 for (j = 0; j < auth->match.num_gids; j++) {
5633 if (gid == auth->match.gids[j]) {
5634 gid_matched = true;
5635 break;
5636 }
5637 }
5638 if (gid_matched)
5639 break;
5640 }
5641 }
5642 if (!gid_matched)
5643 return 0;
5644 }
5645 }
5646
5647 /* path match */
5648 if (auth->match.path) {
5649 if (!tpath)
5650 return 0;
5651
5652 tlen = strlen(tpath);
5653 len = strlen(auth->match.path);
5654 if (len) {
5655 char *_tpath = tpath;
5656 bool free_tpath = false;
5657 int m, n;
5658
5659 doutc(cl, "server path %s, tpath %s, match.path %s\n",
5660 spath, tpath, auth->match.path);
5661 if (spath && (m = strlen(spath)) != 1) {
5662 /* mount path + '/' + tpath + an extra space */
5663 n = m + 1 + tlen + 1;
5664 _tpath = kmalloc(n, GFP_NOFS);
5665 if (!_tpath)
5666 return -ENOMEM;
5667 /* remove the leading '/' */
5668 snprintf(_tpath, n, "%s/%s", spath + 1, tpath);
5669 free_tpath = true;
5670 tlen = strlen(_tpath);
5671 }
5672
5673 /*
5674 * Please note the tailing '/' for match.path has already
5675 * been removed when parsing.
5676 *
5677 * Remove the tailing '/' for the target path.
5678 */
5679 while (tlen && _tpath[tlen - 1] == '/') {
5680 _tpath[tlen - 1] = '\0';
5681 tlen -= 1;
5682 }
5683 doutc(cl, "_tpath %s\n", _tpath);
5684
5685 /*
5686 * In case first == _tpath && tlen == len:
5687 * match.path=/foo --> /foo _path=/foo --> match
5688 * match.path=/foo/ --> /foo _path=/foo --> match
5689 *
5690 * In case first == _tmatch.path && tlen > len:
5691 * match.path=/foo/ --> /foo _path=/foo/ --> match
5692 * match.path=/foo --> /foo _path=/foo/ --> match
5693 * match.path=/foo/ --> /foo _path=/foo/d --> match
5694 * match.path=/foo --> /foo _path=/food --> mismatch
5695 *
5696 * All the other cases --> mismatch
5697 */
3b7d93db 5698 bool path_matched = true;
596afb0b 5699 char *first = strstr(_tpath, auth->match.path);
3b7d93db
AV		 5700 if (first != _tpath ||
5701 (tlen > len && _tpath[len] != '/')) {
5702 path_matched = false;
596afb0b
XL		 5703 }
5704
3b7d93db
AV		 5705 if (free_tpath)
5706 kfree(_tpath);
5707
5708 if (!path_matched)
596afb0b 5709 return 0;
596afb0b
XL		 5710 }
5711 }
5712
5713 doutc(cl, "matched\n");
5714 return 1;
5715}
5716
5717int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, int mask)
5718{
5719 const struct cred *cred = get_current_cred();
5720 u32 caller_uid = from_kuid(&init_user_ns, cred->fsuid);
5721 u32 caller_gid = from_kgid(&init_user_ns, cred->fsgid);
5722 struct ceph_mds_cap_auth *rw_perms_s = NULL;
5723 struct ceph_client *cl = mdsc->fsc->client;
5724 bool root_squash_perms = true;
5725 int i, err;
5726
5727 doutc(cl, "tpath '%s', mask %d, caller_uid %d, caller_gid %d\n",
5728 tpath, mask, caller_uid, caller_gid);
5729
5730 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
5731 struct ceph_mds_cap_auth *s = &mdsc->s_cap_auths[i];
5732
23426309 5733 err = ceph_mds_auth_match(mdsc, s, cred, tpath);
596afb0b 5734 if (err < 0) {
c5cf4203 5735 put_cred(cred);
596afb0b
XL		 5736 return err;
5737 } else if (err > 0) {
3500000b 5738 /* always follow the last auth caps' permission */
596afb0b
XL		 5739 root_squash_perms = true;
5740 rw_perms_s = NULL;
5741 if ((mask & MAY_WRITE) && s->writeable &&
5742 s->match.root_squash && (!caller_uid || !caller_gid))
5743 root_squash_perms = false;
5744
5745 if (((mask & MAY_WRITE) && !s->writeable) ||
5746 ((mask & MAY_READ) && !s->readable))
5747 rw_perms_s = s;
5748 }
5749 }
5750
c5cf4203
MK		 5751 put_cred(cred);
5752
596afb0b
XL		 5753 doutc(cl, "root_squash_perms %d, rw_perms_s %p\n", root_squash_perms,
5754 rw_perms_s);
5755 if (root_squash_perms && rw_perms_s == NULL) {
5756 doutc(cl, "access allowed\n");
5757 return 0;
5758 }
5759
5760 if (!root_squash_perms) {
5761 doutc(cl, "root_squash is enabled and user(%d %d) isn't allowed to write",
5762 caller_uid, caller_gid);
5763 }
5764 if (rw_perms_s) {
5765 doutc(cl, "mds auth caps readable/writeable %d/%d while request r/w %d/%d",
5766 rw_perms_s->readable, rw_perms_s->writeable,
5767 !!(mask & MAY_READ), !!(mask & MAY_WRITE));
5768 }
5769 doutc(cl, "access denied\n");
5770 return -EACCES;
5771}
5772
2f2dc053
SW		 5773/*
5774 * called before mount is ro, and before dentries are torn down.
5775 * (hmm, does this still race with new lookups?)
5776 */
5777void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5778{
38d46409 5779 doutc(mdsc->fsc->client, "begin\n");
e7e607bd 5780 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
2f2dc053 5781
d095559c 5782 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
59b312f3 5783 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
afcdaea3 5784 ceph_flush_dirty_caps(mdsc);
2f2dc053 5785 wait_requests(mdsc);
17c688c3
SW		 5786
5787 /*
5788 * wait for reply handlers to drop their request refs and
5789 * their inode/dcache refs
5790 */
5791 ceph_msgr_flush();
0c44a8e0
LH		 5792
5793 ceph_cleanup_quotarealms_inodes(mdsc);
38d46409 5794 doutc(mdsc->fsc->client, "done\n");
2f2dc053
SW		 5795}
5796
5797/*
1b2ba3c5 5798 * flush the mdlog and wait for all write mds requests to flush.
2f2dc053 5799 */
1b2ba3c5
XL		 5800static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5801 u64 want_tid)
2f2dc053 5802{
38d46409 5803 struct ceph_client *cl = mdsc->fsc->client;
80fc7314 5804 struct ceph_mds_request *req = NULL, *nextreq;
1b2ba3c5 5805 struct ceph_mds_session *last_session = NULL;
44ca18f2 5806 struct rb_node *n;
2f2dc053
SW		 5807
5808 mutex_lock(&mdsc->mutex);
38d46409 5809 doutc(cl, "want %lld\n", want_tid);
80fc7314 5810restart:
44ca18f2
SW		 5811 req = __get_oldest_req(mdsc);
5812 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 5813 /* find next request */
5814 n = rb_next(&req->r_node);
5815 if (n)
5816 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5817 else
5818 nextreq = NULL;
e8a7b8b1
YZ		 5819 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5820 (req->r_op & CEPH_MDS_OP_WRITE)) {
1b2ba3c5
XL		 5821 struct ceph_mds_session *s = req->r_session;
5822
5823 if (!s) {
5824 req = nextreq;
5825 continue;
5826 }
5827
44ca18f2
SW		 5828 /* write op */
5829 ceph_mdsc_get_request(req);
80fc7314
SW		 5830 if (nextreq)
5831 ceph_mdsc_get_request(nextreq);
1b2ba3c5 5832 s = ceph_get_mds_session(s);
44ca18f2 5833 mutex_unlock(&mdsc->mutex);
1b2ba3c5
XL		 5834
5835 /* send flush mdlog request to MDS */
5836 if (last_session != s) {
5837 send_flush_mdlog(s);
5838 ceph_put_mds_session(last_session);
5839 last_session = s;
5840 } else {
5841 ceph_put_mds_session(s);
5842 }
38d46409
XL		 5843 doutc(cl, "wait on %llu (want %llu)\n",
5844 req->r_tid, want_tid);
44ca18f2 5845 wait_for_completion(&req->r_safe_completion);
1b2ba3c5 5846
44ca18f2 5847 mutex_lock(&mdsc->mutex);
44ca18f2 5848 ceph_mdsc_put_request(req);
80fc7314
SW		 5849 if (!nextreq)
5850 break; /* next dne before, so we're done! */
5851 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5852 /* next request was removed from tree */
5853 ceph_mdsc_put_request(nextreq);
5854 goto restart;
5855 }
5856 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 5857 }
80fc7314 5858 req = nextreq;
2f2dc053
SW		 5859 }
5860 mutex_unlock(&mdsc->mutex);
1b2ba3c5 5861 ceph_put_mds_session(last_session);
38d46409 5862 doutc(cl, "done\n");
2f2dc053
SW		 5863}
5864
5865void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5866{
38d46409 5867 struct ceph_client *cl = mdsc->fsc->client;
0e294387 5868 u64 want_tid, want_flush;
2f2dc053 5869
50c9132d 5870 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 5871 return;
5872
38d46409 5873 doutc(cl, "sync\n");
2f2dc053
SW		 5874 mutex_lock(&mdsc->mutex);
5875 want_tid = mdsc->last_tid;
2f2dc053 5876 mutex_unlock(&mdsc->mutex);
2f2dc053 5877
afcdaea3 5878 ceph_flush_dirty_caps(mdsc);
adc52461 5879 ceph_flush_cap_releases(mdsc);
d3383a8e 5880 spin_lock(&mdsc->cap_dirty_lock);
8310b089 5881 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 5882 if (!list_empty(&mdsc->cap_flush_list)) {
5883 struct ceph_cap_flush *cf =
5884 list_last_entry(&mdsc->cap_flush_list,
5885 struct ceph_cap_flush, g_list);
5886 cf->wake = true;
5887 }
d3383a8e
YZ		 5888 spin_unlock(&mdsc->cap_dirty_lock);
5889
38d46409 5890 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2f2dc053 5891
1b2ba3c5 5892 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
0e294387 5893 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 5894}
5895
f3c60c59
SW		 5896/*
5897 * true if all sessions are closed, or we force unmount
5898 */
fcff415c 5899static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 5900{
52953d55 5901 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 5902 return true;
fcff415c 5903 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 5904}
2f2dc053
SW		 5905
5906/*
a68e564a 5907 * called after sb is ro or when metadata corrupted.
2f2dc053
SW		 5908 */
5909void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5910{
a319bf56 5911 struct ceph_options *opts = mdsc->fsc->client->options;
38d46409 5912 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5913 struct ceph_mds_session *session;
5914 int i;
fcff415c 5915 int skipped = 0;
2f2dc053 5916
38d46409 5917 doutc(cl, "begin\n");
2f2dc053 5918
2f2dc053 5919 /* close sessions */
f3c60c59
SW		 5920 mutex_lock(&mdsc->mutex);
5921 for (i = 0; i < mdsc->max_sessions; i++) {
5922 session = __ceph_lookup_mds_session(mdsc, i);
5923 if (!session)
5924 continue;
2f2dc053 5925 mutex_unlock(&mdsc->mutex);
f3c60c59 5926 mutex_lock(&session->s_mutex);
fcff415c
YZ		 5927 if (__close_session(mdsc, session) <= 0)
5928 skipped++;
f3c60c59
SW		 5929 mutex_unlock(&session->s_mutex);
5930 ceph_put_mds_session(session);
2f2dc053
SW		 5931 mutex_lock(&mdsc->mutex);
5932 }
f3c60c59
SW		 5933 mutex_unlock(&mdsc->mutex);
5934
38d46409 5935 doutc(cl, "waiting for sessions to close\n");
fcff415c
YZ		 5936 wait_event_timeout(mdsc->session_close_wq,
5937 done_closing_sessions(mdsc, skipped),
a319bf56 5938 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5939
5940 /* tear down remaining sessions */
f3c60c59 5941 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 5942 for (i = 0; i < mdsc->max_sessions; i++) {
5943 if (mdsc->sessions[i]) {
5b3248c6 5944 session = ceph_get_mds_session(mdsc->sessions[i]);
2600d2dd 5945 __unregister_session(mdsc, session);
2f2dc053
SW		 5946 mutex_unlock(&mdsc->mutex);
5947 mutex_lock(&session->s_mutex);
5948 remove_session_caps(session);
5949 mutex_unlock(&session->s_mutex);
5950 ceph_put_mds_session(session);
5951 mutex_lock(&mdsc->mutex);
5952 }
5953 }
2f2dc053 5954 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 5955 mutex_unlock(&mdsc->mutex);
5956
75c9627e 5957 ceph_cleanup_snapid_map(mdsc);
5ed91587 5958 ceph_cleanup_global_and_empty_realms(mdsc);
2f2dc053 5959
37c4efc1 5960 cancel_work_sync(&mdsc->cap_reclaim_work);
dbc347ef 5961 cancel_work_sync(&mdsc->cap_unlink_work);
2f2dc053
SW		 5962 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5963
38d46409 5964 doutc(cl, "done\n");
2f2dc053
SW		 5965}
5966
48fec5d0
YZ		 5967void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5968{
5969 struct ceph_mds_session *session;
5970 int mds;
5971
38d46409 5972 doutc(mdsc->fsc->client, "force umount\n");
48fec5d0
YZ		 5973
5974 mutex_lock(&mdsc->mutex);
5975 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5976 session = __ceph_lookup_mds_session(mdsc, mds);
5977 if (!session)
5978 continue;
d468e729
YZ		 5979
5980 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5981 __unregister_session(mdsc, session);
5982 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 5983 mutex_unlock(&mdsc->mutex);
d468e729 5984
48fec5d0
YZ		 5985 mutex_lock(&session->s_mutex);
5986 __close_session(mdsc, session);
5987 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5988 cleanup_session_requests(mdsc, session);
5989 remove_session_caps(session);
5990 }
5991 mutex_unlock(&session->s_mutex);
5992 ceph_put_mds_session(session);
d468e729 5993
48fec5d0
YZ		 5994 mutex_lock(&mdsc->mutex);
5995 kick_requests(mdsc, mds);
5996 }
5997 __wake_requests(mdsc, &mdsc->waiting_for_map);
5998 mutex_unlock(&mdsc->mutex);
5999}
6000
3d14c5d2 6001static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053 6002{
38d46409 6003 doutc(mdsc->fsc->client, "stop\n");
fa996773
XL		 6004 /*
6005 * Make sure the delayed work stopped before releasing
6006 * the resources.
6007 *
6008 * Because the cancel_delayed_work_sync() will only
6009 * guarantee that the work finishes executing. But the
6010 * delayed work will re-arm itself again after that.
6011 */
6012 flush_delayed_work(&mdsc->delayed_work);
6013
2f2dc053
SW		 6014 if (mdsc->mdsmap)
6015 ceph_mdsmap_destroy(mdsc->mdsmap);
6016 kfree(mdsc->sessions);
37151668 6017 ceph_caps_finalize(mdsc);
d97079e9
LHS		 6018
6019 if (mdsc->s_cap_auths) {
6020 int i;
6021
6022 for (i = 0; i < mdsc->s_cap_auths_num; i++) {
6023 kfree(mdsc->s_cap_auths[i].match.gids);
6024 kfree(mdsc->s_cap_auths[i].match.path);
6025 kfree(mdsc->s_cap_auths[i].match.fs_name);
6026 }
6027 kfree(mdsc->s_cap_auths);
6028 }
6029
10183a69 6030 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 6031}
6032
3d14c5d2
YS		 6033void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
6034{
6035 struct ceph_mds_client *mdsc = fsc->mdsc;
38d46409 6036 doutc(fsc->client, "%p\n", mdsc);
ef550f6f 6037
50c55aec
CX		 6038 if (!mdsc)
6039 return;
6040
ef550f6f
SW		 6041 /* flush out any connection work with references to us */
6042 ceph_msgr_flush();
6043
62a65f36
YZ		 6044 ceph_mdsc_stop(mdsc);
6045
f9009efa
XL		 6046 ceph_metric_destroy(&mdsc->metric);
6047
3d14c5d2
YS		 6048 fsc->mdsc = NULL;
6049 kfree(mdsc);
38d46409 6050 doutc(fsc->client, "%p done\n", mdsc);
3d14c5d2
YS		 6051}
6052
430afbad
YZ		 6053void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
6054{
6055 struct ceph_fs_client *fsc = mdsc->fsc;
38d46409 6056 struct ceph_client *cl = fsc->client;
430afbad
YZ		 6057 const char *mds_namespace = fsc->mount_options->mds_namespace;
6058 void *p = msg->front.iov_base;
6059 void *end = p + msg->front.iov_len;
6060 u32 epoch;
430afbad
YZ		 6061 u32 num_fs;
6062 u32 mount_fscid = (u32)-1;
430afbad
YZ		 6063 int err = -EINVAL;
6064
6065 ceph_decode_need(&p, end, sizeof(u32), bad);
6066 epoch = ceph_decode_32(&p);
6067
38d46409 6068 doutc(cl, "epoch %u\n", epoch);
430afbad 6069
06a1ad43
JL		 6070 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
6071 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
430afbad 6072
06a1ad43 6073 ceph_decode_32_safe(&p, end, num_fs, bad);
430afbad
YZ		 6074 while (num_fs-- > 0) {
6075 void *info_p, *info_end;
6076 u32 info_len;
430afbad
YZ		 6077 u32 fscid, namelen;
6078
6079 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
06a1ad43 6080 p += 2; // info_v, info_cv
430afbad
YZ		 6081 info_len = ceph_decode_32(&p);
6082 ceph_decode_need(&p, end, info_len, bad);
6083 info_p = p;
6084 info_end = p + info_len;
6085 p = info_end;
6086
6087 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
6088 fscid = ceph_decode_32(&info_p);
6089 namelen = ceph_decode_32(&info_p);
6090 ceph_decode_need(&info_p, info_end, namelen, bad);
6091
6092 if (mds_namespace &&
6093 strlen(mds_namespace) == namelen &&
6094 !strncmp(mds_namespace, (char *)info_p, namelen)) {
6095 mount_fscid = fscid;
6096 break;
6097 }
6098 }
6099
6100 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
6101 if (mount_fscid != (u32)-1) {
6102 fsc->client->monc.fs_cluster_id = mount_fscid;
6103 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
6104 0, true);
6105 ceph_monc_renew_subs(&fsc->client->monc);
6106 } else {
6107 err = -ENOENT;
6108 goto err_out;
6109 }
6110 return;
76bd6ec4 6111
430afbad 6112bad:
38d46409
XL		 6113 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
6114 err);
631ed4b0 6115 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 6116 ceph_msg_dump(msg);
430afbad
YZ		 6117err_out:
6118 mutex_lock(&mdsc->mutex);
76bd6ec4 6119 mdsc->mdsmap_err = err;
430afbad
YZ		 6120 __wake_requests(mdsc, &mdsc->waiting_for_map);
6121 mutex_unlock(&mdsc->mutex);
430afbad 6122}
2f2dc053
SW		 6123
6124/*
6125 * handle mds map update.
6126 */
430afbad 6127void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053 6128{
38d46409 6129 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 6130 u32 epoch;
6131 u32 maplen;
6132 void *p = msg->front.iov_base;
6133 void *end = p + msg->front.iov_len;
6134 struct ceph_mdsmap *newmap, *oldmap;
6135 struct ceph_fsid fsid;
6136 int err = -EINVAL;
6137
6138 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
6139 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 6140 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 6141 return;
c89136ea
SW		 6142 epoch = ceph_decode_32(&p);
6143 maplen = ceph_decode_32(&p);
38d46409 6144 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
2f2dc053
SW		 6145
6146 /* do we need it? */
2f2dc053
SW		 6147 mutex_lock(&mdsc->mutex);
6148 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
38d46409 6149 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
2f2dc053
SW		 6150 mutex_unlock(&mdsc->mutex);
6151 return;
6152 }
6153
197b7d79 6154 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
2f2dc053
SW		 6155 if (IS_ERR(newmap)) {
6156 err = PTR_ERR(newmap);
6157 goto bad_unlock;
6158 }
6159
6160 /* swap into place */
6161 if (mdsc->mdsmap) {
6162 oldmap = mdsc->mdsmap;
6163 mdsc->mdsmap = newmap;
6164 check_new_map(mdsc, newmap, oldmap);
6165 ceph_mdsmap_destroy(oldmap);
6166 } else {
6167 mdsc->mdsmap = newmap; /* first mds map */
6168 }
719784ba
CX		 6169 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
6170 MAX_LFS_FILESIZE);
2f2dc053
SW		 6171
6172 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 6173 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
6174 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 6175
6176 mutex_unlock(&mdsc->mutex);
bf2ba432 6177 schedule_delayed(mdsc, 0);
2f2dc053
SW		 6178 return;
6179
6180bad_unlock:
6181 mutex_unlock(&mdsc->mutex);
6182bad:
38d46409
XL		 6183 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
6184 err);
631ed4b0 6185 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 6186 ceph_msg_dump(msg);
2f2dc053
SW		 6187 return;
6188}
6189
4972cf60 6190static struct ceph_connection *mds_get_con(struct ceph_connection *con)
2f2dc053
SW		 6191{
6192 struct ceph_mds_session *s = con->private;
6193
5b3248c6 6194 if (ceph_get_mds_session(s))
2f2dc053 6195 return con;
2f2dc053
SW		 6196 return NULL;
6197}
6198
4972cf60 6199static void mds_put_con(struct ceph_connection *con)
2f2dc053
SW		 6200{
6201 struct ceph_mds_session *s = con->private;
6202
2f2dc053
SW		 6203 ceph_put_mds_session(s);
6204}
6205
6206/*
6207 * if the client is unresponsive for long enough, the mds will kill
6208 * the session entirely.
6209 */
4972cf60 6210static void mds_peer_reset(struct ceph_connection *con)
2f2dc053
SW		 6211{
6212 struct ceph_mds_session *s = con->private;
7e70f0ed 6213 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 6214
38d46409
XL		 6215 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
6216 s->s_mds);
cbcb358b
XL		 6217 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO &&
6218 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT)
a68e564a 6219 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 6220}
6221
4972cf60 6222static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2f2dc053
SW		 6223{
6224 struct ceph_mds_session *s = con->private;
6225 struct ceph_mds_client *mdsc = s->s_mdsc;
38d46409 6226 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 6227 int type = le16_to_cpu(msg->hdr.type);
6228
2600d2dd
SW		 6229 mutex_lock(&mdsc->mutex);
6230 if (__verify_registered_session(mdsc, s) < 0) {
6231 mutex_unlock(&mdsc->mutex);
6232 goto out;
6233 }
6234 mutex_unlock(&mdsc->mutex);
6235
2f2dc053
SW		 6236 switch (type) {
6237 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 6238 ceph_mdsc_handle_mdsmap(mdsc, msg);
6239 break;
6240 case CEPH_MSG_FS_MAP_USER:
6241 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 6242 break;
6243 case CEPH_MSG_CLIENT_SESSION:
6244 handle_session(s, msg);
6245 break;
6246 case CEPH_MSG_CLIENT_REPLY:
6247 handle_reply(s, msg);
6248 break;
6249 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 6250 handle_forward(mdsc, s, msg);
2f2dc053
SW		 6251 break;
6252 case CEPH_MSG_CLIENT_CAPS:
6253 ceph_handle_caps(s, msg);
6254 break;
6255 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 6256 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 6257 break;
6258 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 6259 handle_lease(mdsc, s, msg);
2f2dc053 6260 break;
fb18a575
LH		 6261 case CEPH_MSG_CLIENT_QUOTA:
6262 ceph_handle_quota(mdsc, s, msg);
6263 break;
2f2dc053
SW		 6264
6265 default:
38d46409
XL		 6266 pr_err_client(cl, "received unknown message type %d %s\n",
6267 type, ceph_msg_type_name(type));
2f2dc053 6268 }
2600d2dd 6269out:
2f2dc053
SW		 6270 ceph_msg_put(msg);
6271}
6272
4e7a5dcd
SW		 6273/*
6274 * authentication
6275 */
a3530df3
AE		 6276
6277/*
6278 * Note: returned pointer is the address of a structure that's
6279 * managed separately. Caller must *not* attempt to free it.
6280 */
4972cf60
ID		 6281static struct ceph_auth_handshake *
6282mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
4e7a5dcd
SW		 6283{
6284 struct ceph_mds_session *s = con->private;
6285 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6286 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 6287 struct ceph_auth_handshake *auth = &s->s_auth;
ce287162 6288 int ret;
4e7a5dcd 6289
ce287162
ID		 6290 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6291 force_new, proto, NULL, NULL);
6292 if (ret)
6293 return ERR_PTR(ret);
74f1869f 6294
a3530df3 6295 return auth;
4e7a5dcd
SW		 6296}
6297
4972cf60 6298static int mds_add_authorizer_challenge(struct ceph_connection *con,
6daca13d
ID		 6299 void *challenge_buf, int challenge_buf_len)
6300{
6301 struct ceph_mds_session *s = con->private;
6302 struct ceph_mds_client *mdsc = s->s_mdsc;
6303 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6304
6305 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
6306 challenge_buf, challenge_buf_len);
6307}
4e7a5dcd 6308
4972cf60 6309static int mds_verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 6310{
6311 struct ceph_mds_session *s = con->private;
6312 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6313 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
285ea34f 6314 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 6315
285ea34f
ID		 6316 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
6317 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
6318 NULL, NULL, NULL, NULL);
4e7a5dcd
SW		 6319}
6320
4972cf60 6321static int mds_invalidate_authorizer(struct ceph_connection *con)
9bd2e6f8
SW		 6322{
6323 struct ceph_mds_session *s = con->private;
6324 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6325 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 6326
27859f97 6327 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 6328
3d14c5d2 6329 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 6330}
6331
cd1a677c
ID		 6332static int mds_get_auth_request(struct ceph_connection *con,
6333 void *buf, int *buf_len,
6334 void **authorizer, int *authorizer_len)
6335{
6336 struct ceph_mds_session *s = con->private;
6337 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6338 struct ceph_auth_handshake *auth = &s->s_auth;
6339 int ret;
6340
6341 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6342 buf, buf_len);
6343 if (ret)
6344 return ret;
6345
6346 *authorizer = auth->authorizer_buf;
6347 *authorizer_len = auth->authorizer_buf_len;
6348 return 0;
6349}
6350
6351static int mds_handle_auth_reply_more(struct ceph_connection *con,
6352 void *reply, int reply_len,
6353 void *buf, int *buf_len,
6354 void **authorizer, int *authorizer_len)
6355{
6356 struct ceph_mds_session *s = con->private;
6357 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6358 struct ceph_auth_handshake *auth = &s->s_auth;
6359 int ret;
6360
6361 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6362 buf, buf_len);
6363 if (ret)
6364 return ret;
6365
6366 *authorizer = auth->authorizer_buf;
6367 *authorizer_len = auth->authorizer_buf_len;
6368 return 0;
6369}
6370
6371static int mds_handle_auth_done(struct ceph_connection *con,
6372 u64 global_id, void *reply, int reply_len,
6373 u8 *session_key, int *session_key_len,
6374 u8 *con_secret, int *con_secret_len)
6375{
6376 struct ceph_mds_session *s = con->private;
6377 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6378 struct ceph_auth_handshake *auth = &s->s_auth;
6379
6380 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6381 session_key, session_key_len,
6382 con_secret, con_secret_len);
6383}
6384
6385static int mds_handle_auth_bad_method(struct ceph_connection *con,
6386 int used_proto, int result,
6387 const int *allowed_protos, int proto_cnt,
6388 const int *allowed_modes, int mode_cnt)
6389{
6390 struct ceph_mds_session *s = con->private;
6391 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6392 int ret;
6393
6394 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6395 used_proto, result,
6396 allowed_protos, proto_cnt,
6397 allowed_modes, mode_cnt)) {
6398 ret = ceph_monc_validate_auth(monc);
6399 if (ret)
6400 return ret;
6401 }
6402
6403 return -EACCES;
6404}
6405
53ded495
AE		 6406static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6407 struct ceph_msg_header *hdr, int *skip)
6408{
6409 struct ceph_msg *msg;
6410 int type = (int) le16_to_cpu(hdr->type);
6411 int front_len = (int) le32_to_cpu(hdr->front_len);
6412
6413 if (con->in_msg)
6414 return con->in_msg;
6415
6416 *skip = 0;
6417 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6418 if (!msg) {
6419 pr_err("unable to allocate msg type %d len %d\n",
6420 type, front_len);
6421 return NULL;
6422 }
53ded495
AE		 6423
6424 return msg;
6425}
6426
79dbd1ba 6427static int mds_sign_message(struct ceph_msg *msg)
33d07337 6428{
79dbd1ba 6429 struct ceph_mds_session *s = msg->con->private;
33d07337 6430 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6431
33d07337
YZ		 6432 return ceph_auth_sign_message(auth, msg);
6433}
6434
79dbd1ba 6435static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 6436{
79dbd1ba 6437 struct ceph_mds_session *s = msg->con->private;
33d07337 6438 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6439
33d07337
YZ		 6440 return ceph_auth_check_message_signature(auth, msg);
6441}
6442
9e32789f 6443static const struct ceph_connection_operations mds_con_ops = {
4972cf60
ID		 6444 .get = mds_get_con,
6445 .put = mds_put_con,
53ded495 6446 .alloc_msg = mds_alloc_msg,
4972cf60
ID		 6447 .dispatch = mds_dispatch,
6448 .peer_reset = mds_peer_reset,
6449 .get_authorizer = mds_get_authorizer,
6450 .add_authorizer_challenge = mds_add_authorizer_challenge,
6451 .verify_authorizer_reply = mds_verify_authorizer_reply,
6452 .invalidate_authorizer = mds_invalidate_authorizer,
79dbd1ba
ID		 6453 .sign_message = mds_sign_message,
6454 .check_message_signature = mds_check_message_signature,
cd1a677c
ID		 6455 .get_auth_request = mds_get_auth_request,
6456 .handle_auth_reply_more = mds_handle_auth_reply_more,
6457 .handle_auth_done = mds_handle_auth_done,
6458 .handle_auth_bad_method = mds_handle_auth_bad_method,
2f2dc053
SW		 6459};
6460
2f2dc053 6461/* eof */
Linux 6.x block layer and io_uring tree(s)