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Merge tag 'net-6.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
[linux-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52 * are no longer valid.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
830 * CDenty. That means the just created file is possiblly deleted later
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
154f42c2
SW		 1750void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1751 struct ceph_mds_session *session)
1752{
1753 mutex_lock(&mdsc->mutex);
1754 __open_export_target_sessions(mdsc, session);
1755 mutex_unlock(&mdsc->mutex);
1756}
1757
2f2dc053
SW		 1758/*
1759 * session caps
1760 */
1761
c8a96a31
JL		 1762static void detach_cap_releases(struct ceph_mds_session *session,
1763 struct list_head *target)
2f2dc053 1764{
38d46409
XL		 1765 struct ceph_client *cl = session->s_mdsc->fsc->client;
1766
c8a96a31
JL		 1767 lockdep_assert_held(&session->s_cap_lock);
1768
1769 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1770 session->s_num_cap_releases = 0;
38d46409 1771 doutc(cl, "mds%d\n", session->s_mds);
c8a96a31 1772}
2f2dc053 1773
c8a96a31
JL		 1774static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1775 struct list_head *dispose)
1776{
1777 while (!list_empty(dispose)) {
745a8e3b
YZ		 1778 struct ceph_cap *cap;
1779 /* zero out the in-progress message */
c8a96a31 1780 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1781 list_del(&cap->session_caps);
1782 ceph_put_cap(mdsc, cap);
2f2dc053 1783 }
2f2dc053
SW		 1784}
1785
1c841a96
YZ		 1786static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1787 struct ceph_mds_session *session)
1788{
38d46409 1789 struct ceph_client *cl = mdsc->fsc->client;
1c841a96
YZ		 1790 struct ceph_mds_request *req;
1791 struct rb_node *p;
1792
38d46409 1793 doutc(cl, "mds%d\n", session->s_mds);
1c841a96
YZ		 1794 mutex_lock(&mdsc->mutex);
1795 while (!list_empty(&session->s_unsafe)) {
1796 req = list_first_entry(&session->s_unsafe,
1797 struct ceph_mds_request, r_unsafe_item);
38d46409
XL		 1798 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1799 req->r_tid);
1bd85aa6
JL		 1800 if (req->r_target_inode)
1801 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1802 if (req->r_unsafe_dir)
1803 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1c841a96
YZ		 1804 __unregister_request(mdsc, req);
1805 }
1806 /* zero r_attempts, so kick_requests() will re-send requests */
1807 p = rb_first(&mdsc->request_tree);
1808 while (p) {
1809 req = rb_entry(p, struct ceph_mds_request, r_node);
1810 p = rb_next(p);
1811 if (req->r_session &&
1812 req->r_session->s_mds == session->s_mds)
1813 req->r_attempts = 0;
1814 }
1815 mutex_unlock(&mdsc->mutex);
1816}
1817
2f2dc053 1818/*
f818a736
SW		 1819 * Helper to safely iterate over all caps associated with a session, with
1820 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1821 *
f818a736 1822 * Caller must hold session s_mutex.
2f2dc053 1823 */
f5d77269 1824int ceph_iterate_session_caps(struct ceph_mds_session *session,
aaf67de7
XL		 1825 int (*cb)(struct inode *, int mds, void *),
1826 void *arg)
2f2dc053 1827{
38d46409 1828 struct ceph_client *cl = session->s_mdsc->fsc->client;
7c1332b8
SW		 1829 struct list_head *p;
1830 struct ceph_cap *cap;
1831 struct inode *inode, *last_inode = NULL;
1832 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1833 int ret;
1834
38d46409 1835 doutc(cl, "%p mds%d\n", session, session->s_mds);
2f2dc053 1836 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1837 p = session->s_caps.next;
1838 while (p != &session->s_caps) {
aaf67de7
XL		 1839 int mds;
1840
7c1332b8 1841 cap = list_entry(p, struct ceph_cap, session_caps);
874c8ca1 1842 inode = igrab(&cap->ci->netfs.inode);
7c1332b8
SW		 1843 if (!inode) {
1844 p = p->next;
2f2dc053 1845 continue;
7c1332b8
SW		 1846 }
1847 session->s_cap_iterator = cap;
aaf67de7 1848 mds = cap->mds;
2f2dc053 1849 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1850
1851 if (last_inode) {
23c2c76e 1852 iput(last_inode);
7c1332b8
SW		 1853 last_inode = NULL;
1854 }
1855 if (old_cap) {
37151668 1856 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1857 old_cap = NULL;
1858 }
1859
aaf67de7 1860 ret = cb(inode, mds, arg);
7c1332b8
SW		 1861 last_inode = inode;
1862
2f2dc053 1863 spin_lock(&session->s_cap_lock);
7c1332b8 1864 p = p->next;
d37b1d99 1865 if (!cap->ci) {
38d46409 1866 doutc(cl, "finishing cap %p removal\n", cap);
7c1332b8 1867 BUG_ON(cap->session != session);
745a8e3b 1868 cap->session = NULL;
7c1332b8
SW		 1869 list_del_init(&cap->session_caps);
1870 session->s_nr_caps--;
4f1d756d 1871 atomic64_dec(&session->s_mdsc->metric.total_caps);
e3ec8d68
YZ		 1872 if (cap->queue_release)
1873 __ceph_queue_cap_release(session, cap);
1874 else
745a8e3b 1875 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1876 }
5dacf091
SW		 1877 if (ret < 0)
1878 goto out;
2f2dc053 1879 }
5dacf091
SW		 1880 ret = 0;
1881out:
7c1332b8 1882 session->s_cap_iterator = NULL;
2f2dc053 1883 spin_unlock(&session->s_cap_lock);
7c1332b8 1884
23c2c76e 1885 iput(last_inode);
7c1332b8 1886 if (old_cap)
37151668 1887 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1888
5dacf091 1889 return ret;
2f2dc053
SW		 1890}
1891
aaf67de7 1892static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053
SW		 1893{
1894 struct ceph_inode_info *ci = ceph_inode(inode);
38d46409 1895 struct ceph_client *cl = ceph_inode_to_client(inode);
6c93df5d 1896 bool invalidate = false;
aaf67de7
XL		 1897 struct ceph_cap *cap;
1898 int iputs = 0;
6c99f254 1899
be655596 1900 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 1901 cap = __get_cap_for_mds(ci, mds);
1902 if (cap) {
38d46409
XL		 1903 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1904 cap, ci, &ci->netfs.inode);
aaf67de7
XL		 1905
1906 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1907 }
be655596 1908 spin_unlock(&ci->i_ceph_lock);
77310320 1909
aaf67de7
XL		 1910 if (cap)
1911 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1912 if (invalidate)
1913 ceph_queue_invalidate(inode);
36e6da98 1914 while (iputs--)
a6d37ccd 1915 iput(inode);
2f2dc053
SW		 1916 return 0;
1917}
1918
1919/*
1920 * caller must hold session s_mutex
1921 */
1922static void remove_session_caps(struct ceph_mds_session *session)
1923{
6c93df5d
YZ		 1924 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1925 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1926 LIST_HEAD(dispose);
1927
38d46409 1928 doutc(fsc->client, "on %p\n", session);
f5d77269 1929 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1930
c8799fc4
YZ		 1931 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1932
6f60f889
YZ		 1933 spin_lock(&session->s_cap_lock);
1934 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1935 struct inode *inode;
1936 struct ceph_cap *cap, *prev = NULL;
1937 struct ceph_vino vino;
1938 /*
1939 * iterate_session_caps() skips inodes that are being
1940 * deleted, we need to wait until deletions are complete.
1941 * __wait_on_freeing_inode() is designed for the job,
1942 * but it is not exported, so use lookup inode function
1943 * to access it.
1944 */
1945 while (!list_empty(&session->s_caps)) {
1946 cap = list_entry(session->s_caps.next,
1947 struct ceph_cap, session_caps);
1948 if (cap == prev)
1949 break;
1950 prev = cap;
1951 vino = cap->ci->i_vino;
1952 spin_unlock(&session->s_cap_lock);
1953
ed284c49 1954 inode = ceph_find_inode(sb, vino);
23c2c76e 1955 iput(inode);
6f60f889
YZ		 1956
1957 spin_lock(&session->s_cap_lock);
1958 }
1959 }
745a8e3b
YZ		 1960
1961 // drop cap expires and unlock s_cap_lock
c8a96a31 1962 detach_cap_releases(session, &dispose);
6f60f889 1963
2f2dc053 1964 BUG_ON(session->s_nr_caps > 0);
6c99f254 1965 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1966 spin_unlock(&session->s_cap_lock);
1967 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1968}
1969
d2f8bb27
YZ		 1970enum {
1971 RECONNECT,
1972 RENEWCAPS,
1973 FORCE_RO,
1974};
1975
2f2dc053
SW		 1976/*
1977 * wake up any threads waiting on this session's caps. if the cap is
1978 * old (didn't get renewed on the client reconnect), remove it now.
1979 *
1980 * caller must hold s_mutex.
1981 */
aaf67de7 1982static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
2f2dc053 1983{
0dc2570f 1984 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1985 unsigned long ev = (unsigned long)arg;
0dc2570f 1986
d2f8bb27 1987 if (ev == RECONNECT) {
be655596 1988 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1989 ci->i_wanted_max_size = 0;
1990 ci->i_requested_max_size = 0;
be655596 1991 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1992 } else if (ev == RENEWCAPS) {
aaf67de7
XL		 1993 struct ceph_cap *cap;
1994
1995 spin_lock(&ci->i_ceph_lock);
1996 cap = __get_cap_for_mds(ci, mds);
1997 /* mds did not re-issue stale cap */
1998 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
d2f8bb27 1999 cap->issued = cap->implemented = CEPH_CAP_PIN;
aaf67de7 2000 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 2001 } else if (ev == FORCE_RO) {
0dc2570f 2002 }
e5360309 2003 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 2004 return 0;
2005}
2006
d2f8bb27 2007static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053 2008{
38d46409
XL		 2009 struct ceph_client *cl = session->s_mdsc->fsc->client;
2010
2011 doutc(cl, "session %p mds%d\n", session, session->s_mds);
f5d77269
JL		 2012 ceph_iterate_session_caps(session, wake_up_session_cb,
2013 (void *)(unsigned long)ev);
2f2dc053
SW		 2014}
2015
2016/*
2017 * Send periodic message to MDS renewing all currently held caps. The
2018 * ack will reset the expiration for all caps from this session.
2019 *
2020 * caller holds s_mutex
2021 */
2022static int send_renew_caps(struct ceph_mds_client *mdsc,
2023 struct ceph_mds_session *session)
2024{
38d46409 2025 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2026 struct ceph_msg *msg;
2027 int state;
2028
2029 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2030 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
38d46409 2031 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
e4cb4cb8 2032 session->s_renew_requested = jiffies;
2f2dc053
SW		 2033
2034 /* do not try to renew caps until a recovering mds has reconnected
2035 * with its clients. */
2036 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2037 if (state < CEPH_MDS_STATE_RECONNECT) {
38d46409
XL		 2038 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2039 ceph_mds_state_name(state));
2f2dc053
SW		 2040 return 0;
2041 }
2042
38d46409
XL		 2043 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2044 ceph_mds_state_name(state));
6df89bf2 2045 msg = create_session_full_msg(mdsc, CEPH_SESSION_REQUEST_RENEWCAPS,
fba97e80 2046 ++session->s_renew_seq);
6df89bf2
XL		 2047 if (IS_ERR(msg))
2048 return PTR_ERR(msg);
2f2dc053
SW		 2049 ceph_con_send(&session->s_con, msg);
2050 return 0;
2051}
2052
186e4f7a
YZ		 2053static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2054 struct ceph_mds_session *session, u64 seq)
2055{
38d46409 2056 struct ceph_client *cl = mdsc->fsc->client;
186e4f7a
YZ		 2057 struct ceph_msg *msg;
2058
38d46409
XL		 2059 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2060 ceph_session_state_name(session->s_state), seq);
fba97e80 2061 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
186e4f7a
YZ		 2062 if (!msg)
2063 return -ENOMEM;
2064 ceph_con_send(&session->s_con, msg);
2065 return 0;
2066}
2067
2068
2f2dc053
SW		 2069/*
2070 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 2071 *
2072 * Called under session->s_mutex
2f2dc053
SW		 2073 */
2074static void renewed_caps(struct ceph_mds_client *mdsc,
2075 struct ceph_mds_session *session, int is_renew)
2076{
38d46409 2077 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2078 int was_stale;
2079 int wake = 0;
2080
2081 spin_lock(&session->s_cap_lock);
1ce208a6 2082 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 2083
2084 session->s_cap_ttl = session->s_renew_requested +
2085 mdsc->mdsmap->m_session_timeout*HZ;
2086
2087 if (was_stale) {
2088 if (time_before(jiffies, session->s_cap_ttl)) {
38d46409
XL		 2089 pr_info_client(cl, "mds%d caps renewed\n",
2090 session->s_mds);
2f2dc053
SW		 2091 wake = 1;
2092 } else {
38d46409
XL		 2093 pr_info_client(cl, "mds%d caps still stale\n",
2094 session->s_mds);
2f2dc053
SW		 2095 }
2096 }
38d46409
XL		 2097 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2098 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2099 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2f2dc053
SW		 2100 spin_unlock(&session->s_cap_lock);
2101
2102 if (wake)
d2f8bb27 2103 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 2104}
2105
2106/*
2107 * send a session close request
2108 */
3e699bd8 2109static int request_close_session(struct ceph_mds_session *session)
2f2dc053 2110{
38d46409 2111 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053 2112 struct ceph_msg *msg;
2f2dc053 2113
38d46409
XL		 2114 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2115 ceph_session_state_name(session->s_state), session->s_seq);
fba97e80
XL		 2116 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2117 session->s_seq);
a79832f2
SW		 2118 if (!msg)
2119 return -ENOMEM;
2120 ceph_con_send(&session->s_con, msg);
fcff415c 2121 return 1;
2f2dc053
SW		 2122}
2123
2124/*
2125 * Called with s_mutex held.
2126 */
2127static int __close_session(struct ceph_mds_client *mdsc,
2128 struct ceph_mds_session *session)
2129{
2130 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2131 return 0;
2132 session->s_state = CEPH_MDS_SESSION_CLOSING;
3e699bd8 2133 return request_close_session(session);
2f2dc053
SW		 2134}
2135
040d7860
YZ		 2136static bool drop_negative_children(struct dentry *dentry)
2137{
2138 struct dentry *child;
2139 bool all_negative = true;
2140
2141 if (!d_is_dir(dentry))
2142 goto out;
2143
2144 spin_lock(&dentry->d_lock);
da549bdd 2145 hlist_for_each_entry(child, &dentry->d_children, d_sib) {
040d7860
YZ		 2146 if (d_really_is_positive(child)) {
2147 all_negative = false;
2148 break;
2149 }
2150 }
2151 spin_unlock(&dentry->d_lock);
2152
2153 if (all_negative)
2154 shrink_dcache_parent(dentry);
2155out:
2156 return all_negative;
2157}
2158
2f2dc053
SW		 2159/*
2160 * Trim old(er) caps.
2161 *
2162 * Because we can't cache an inode without one or more caps, we do
2163 * this indirectly: if a cap is unused, we prune its aliases, at which
2164 * point the inode will hopefully get dropped to.
2165 *
2166 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2167 * memory pressure from the MDS, though, so it needn't be perfect.
2168 */
aaf67de7 2169static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 2170{
197b7d79 2171 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 2172 struct ceph_client *cl = mdsc->fsc->client;
533a2818 2173 int *remaining = arg;
2f2dc053 2174 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 2175 int used, wanted, oissued, mine;
aaf67de7 2176 struct ceph_cap *cap;
2f2dc053 2177
533a2818 2178 if (*remaining <= 0)
2f2dc053
SW		 2179 return -1;
2180
be655596 2181 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 2182 cap = __get_cap_for_mds(ci, mds);
2183 if (!cap) {
2184 spin_unlock(&ci->i_ceph_lock);
2185 return 0;
2186 }
2f2dc053
SW		 2187 mine = cap->issued | cap->implemented;
2188 used = __ceph_caps_used(ci);
979abfdd 2189 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 2190 oissued = __ceph_caps_issued_other(ci, cap);
2191
38d46409
XL		 2192 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2193 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2194 ceph_cap_string(oissued), ceph_cap_string(used),
2195 ceph_cap_string(wanted));
979abfdd 2196 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 2197 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2198 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 2199 goto out;
2200 if ((used | wanted) & CEPH_CAP_ANY_WR)
2201 goto out;
89aa5930
YZ		 2202 /* Note: it's possible that i_filelock_ref becomes non-zero
2203 * after dropping auth caps. It doesn't hurt because reply
2204 * of lock mds request will re-add auth caps. */
2205 if (atomic_read(&ci->i_filelock_ref) > 0)
2206 goto out;
979abfdd 2207 }
5e804ac4
YZ		 2208 /* The inode has cached pages, but it's no longer used.
2209 * we can safely drop it */
525d15e8
YZ		 2210 if (S_ISREG(inode->i_mode) &&
2211 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
5e804ac4
YZ		 2212 !(oissued & CEPH_CAP_FILE_CACHE)) {
2213 used = 0;
2214 oissued = 0;
2215 }
979abfdd 2216 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 2217 goto out; /* we need these caps */
2218
2f2dc053
SW		 2219 if (oissued) {
2220 /* we aren't the only cap.. just remove us */
197b7d79 2221 ceph_remove_cap(mdsc, cap, true);
533a2818 2222 (*remaining)--;
2f2dc053 2223 } else {
040d7860 2224 struct dentry *dentry;
5e804ac4 2225 /* try dropping referring dentries */
be655596 2226 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 2227 dentry = d_find_any_alias(inode);
2228 if (dentry && drop_negative_children(dentry)) {
2229 int count;
2230 dput(dentry);
2231 d_prune_aliases(inode);
2232 count = atomic_read(&inode->i_count);
2233 if (count == 1)
533a2818 2234 (*remaining)--;
38d46409
XL		 2235 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2236 inode, ceph_vinop(inode), cap, count);
040d7860
YZ		 2237 } else {
2238 dput(dentry);
2239 }
2f2dc053
SW		 2240 return 0;
2241 }
2242
2243out:
be655596 2244 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 2245 return 0;
2246}
2247
2248/*
2249 * Trim session cap count down to some max number.
2250 */
e30ee581
ZZ		 2251int ceph_trim_caps(struct ceph_mds_client *mdsc,
2252 struct ceph_mds_session *session,
2253 int max_caps)
2f2dc053 2254{
38d46409 2255 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2256 int trim_caps = session->s_nr_caps - max_caps;
2257
38d46409
XL		 2258 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2259 session->s_nr_caps, max_caps, trim_caps);
2f2dc053 2260 if (trim_caps > 0) {
533a2818
JL		 2261 int remaining = trim_caps;
2262
2263 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
38d46409
XL		 2264 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2265 session->s_mds, session->s_nr_caps, max_caps,
2266 trim_caps - remaining);
2f2dc053 2267 }
a56371d9 2268
e3ec8d68 2269 ceph_flush_cap_releases(mdsc, session);
2f2dc053
SW		 2270 return 0;
2271}
2272
8310b089
YZ		 2273static int check_caps_flush(struct ceph_mds_client *mdsc,
2274 u64 want_flush_tid)
2275{
38d46409 2276 struct ceph_client *cl = mdsc->fsc->client;
8310b089
YZ		 2277 int ret = 1;
2278
2279 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 2280 if (!list_empty(&mdsc->cap_flush_list)) {
2281 struct ceph_cap_flush *cf =
2282 list_first_entry(&mdsc->cap_flush_list,
2283 struct ceph_cap_flush, g_list);
2284 if (cf->tid <= want_flush_tid) {
38d46409
XL		 2285 doutc(cl, "still flushing tid %llu <= %llu\n",
2286 cf->tid, want_flush_tid);
e4500b5e
YZ		 2287 ret = 0;
2288 }
8310b089
YZ		 2289 }
2290 spin_unlock(&mdsc->cap_dirty_lock);
2291 return ret;
d3383a8e
YZ		 2292}
2293
2f2dc053
SW		 2294/*
2295 * flush all dirty inode data to disk.
2296 *
8310b089 2297 * returns true if we've flushed through want_flush_tid
2f2dc053 2298 */
affbc19a 2299static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 2300 u64 want_flush_tid)
2f2dc053 2301{
38d46409
XL		 2302 struct ceph_client *cl = mdsc->fsc->client;
2303
2304 doutc(cl, "want %llu\n", want_flush_tid);
8310b089
YZ		 2305
2306 wait_event(mdsc->cap_flushing_wq,
2307 check_caps_flush(mdsc, want_flush_tid));
2308
38d46409 2309 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 2310}
2311
2312/*
2313 * called under s_mutex
2314 */
e3ec8d68
YZ		 2315static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2316 struct ceph_mds_session *session)
2f2dc053 2317{
38d46409 2318 struct ceph_client *cl = mdsc->fsc->client;
745a8e3b
YZ		 2319 struct ceph_msg *msg = NULL;
2320 struct ceph_mds_cap_release *head;
2321 struct ceph_mds_cap_item *item;
92475f05 2322 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 2323 struct ceph_cap *cap;
2324 LIST_HEAD(tmp_list);
2325 int num_cap_releases;
92475f05
JL		 2326 __le32 barrier, *cap_barrier;
2327
2328 down_read(&osdc->lock);
2329 barrier = cpu_to_le32(osdc->epoch_barrier);
2330 up_read(&osdc->lock);
2f2dc053 2331
0f8605f2 2332 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 2333again:
2334 list_splice_init(&session->s_cap_releases, &tmp_list);
2335 num_cap_releases = session->s_num_cap_releases;
2336 session->s_num_cap_releases = 0;
2f2dc053 2337 spin_unlock(&session->s_cap_lock);
e01a5946 2338
745a8e3b
YZ		 2339 while (!list_empty(&tmp_list)) {
2340 if (!msg) {
2341 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 2342 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 2343 if (!msg)
2344 goto out_err;
2345 head = msg->front.iov_base;
2346 head->num = cpu_to_le32(0);
2347 msg->front.iov_len = sizeof(*head);
92475f05
JL		 2348
2349 msg->hdr.version = cpu_to_le16(2);
2350 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 2351 }
92475f05 2352
745a8e3b
YZ		 2353 cap = list_first_entry(&tmp_list, struct ceph_cap,
2354 session_caps);
2355 list_del(&cap->session_caps);
2356 num_cap_releases--;
e01a5946 2357
00bd8edb 2358 head = msg->front.iov_base;
4198aba4
JL		 2359 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2360 &head->num);
745a8e3b
YZ		 2361 item = msg->front.iov_base + msg->front.iov_len;
2362 item->ino = cpu_to_le64(cap->cap_ino);
2363 item->cap_id = cpu_to_le64(cap->cap_id);
2364 item->migrate_seq = cpu_to_le32(cap->mseq);
2365 item->seq = cpu_to_le32(cap->issue_seq);
2366 msg->front.iov_len += sizeof(*item);
2367
2368 ceph_put_cap(mdsc, cap);
2369
2370 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 2371 // Append cap_barrier field
2372 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2373 *cap_barrier = barrier;
2374 msg->front.iov_len += sizeof(*cap_barrier);
2375
745a8e3b 2376 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2377 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b
YZ		 2378 ceph_con_send(&session->s_con, msg);
2379 msg = NULL;
2380 }
00bd8edb 2381 }
e01a5946 2382
745a8e3b 2383 BUG_ON(num_cap_releases != 0);
e01a5946 2384
745a8e3b
YZ		 2385 spin_lock(&session->s_cap_lock);
2386 if (!list_empty(&session->s_cap_releases))
2387 goto again;
2388 spin_unlock(&session->s_cap_lock);
2389
2390 if (msg) {
92475f05
JL		 2391 // Append cap_barrier field
2392 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2393 *cap_barrier = barrier;
2394 msg->front.iov_len += sizeof(*cap_barrier);
2395
745a8e3b 2396 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2397 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b 2398 ceph_con_send(&session->s_con, msg);
e01a5946 2399 }
745a8e3b
YZ		 2400 return;
2401out_err:
38d46409
XL		 2402 pr_err_client(cl, "mds%d, failed to allocate message\n",
2403 session->s_mds);
745a8e3b
YZ		 2404 spin_lock(&session->s_cap_lock);
2405 list_splice(&tmp_list, &session->s_cap_releases);
2406 session->s_num_cap_releases += num_cap_releases;
2407 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 2408}
2409
e3ec8d68
YZ		 2410static void ceph_cap_release_work(struct work_struct *work)
2411{
2412 struct ceph_mds_session *session =
2413 container_of(work, struct ceph_mds_session, s_cap_release_work);
2414
2415 mutex_lock(&session->s_mutex);
2416 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2417 session->s_state == CEPH_MDS_SESSION_HUNG)
2418 ceph_send_cap_releases(session->s_mdsc, session);
2419 mutex_unlock(&session->s_mutex);
2420 ceph_put_mds_session(session);
2421}
2422
2423void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2424 struct ceph_mds_session *session)
2425{
38d46409 2426 struct ceph_client *cl = mdsc->fsc->client;
e3ec8d68
YZ		 2427 if (mdsc->stopping)
2428 return;
2429
5b3248c6 2430 ceph_get_mds_session(session);
e3ec8d68
YZ		 2431 if (queue_work(mdsc->fsc->cap_wq,
2432 &session->s_cap_release_work)) {
38d46409 2433 doutc(cl, "cap release work queued\n");
e3ec8d68
YZ		 2434 } else {
2435 ceph_put_mds_session(session);
38d46409 2436 doutc(cl, "failed to queue cap release work\n");
e3ec8d68
YZ		 2437 }
2438}
2439
2440/*
2441 * caller holds session->s_cap_lock
2442 */
2443void __ceph_queue_cap_release(struct ceph_mds_session *session,
2444 struct ceph_cap *cap)
2445{
2446 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2447 session->s_num_cap_releases++;
2448
2449 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2450 ceph_flush_cap_releases(session->s_mdsc, session);
2451}
2452
37c4efc1
YZ		 2453static void ceph_cap_reclaim_work(struct work_struct *work)
2454{
2455 struct ceph_mds_client *mdsc =
2456 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2457 int ret = ceph_trim_dentries(mdsc);
2458 if (ret == -EAGAIN)
2459 ceph_queue_cap_reclaim_work(mdsc);
2460}
2461
2462void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2463{
38d46409 2464 struct ceph_client *cl = mdsc->fsc->client;
37c4efc1
YZ		 2465 if (mdsc->stopping)
2466 return;
2467
2468 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
38d46409 2469 doutc(cl, "caps reclaim work queued\n");
37c4efc1 2470 } else {
38d46409 2471 doutc(cl, "failed to queue caps release work\n");
37c4efc1
YZ		 2472 }
2473}
2474
fe33032d
YZ		 2475void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2476{
2477 int val;
2478 if (!nr)
2479 return;
2480 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
bba1560b 2481 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
fe33032d
YZ		 2482 atomic_set(&mdsc->cap_reclaim_pending, 0);
2483 ceph_queue_cap_reclaim_work(mdsc);
2484 }
2485}
2486
dbc347ef
XL		 2487void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc)
2488{
2489 struct ceph_client *cl = mdsc->fsc->client;
2490 if (mdsc->stopping)
2491 return;
2492
2493 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_unlink_work)) {
2494 doutc(cl, "caps unlink work queued\n");
2495 } else {
2496 doutc(cl, "failed to queue caps unlink work\n");
2497 }
2498}
2499
2500static void ceph_cap_unlink_work(struct work_struct *work)
2501{
2502 struct ceph_mds_client *mdsc =
2503 container_of(work, struct ceph_mds_client, cap_unlink_work);
2504 struct ceph_client *cl = mdsc->fsc->client;
2505
2506 doutc(cl, "begin\n");
17f8dc2d 2507 spin_lock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2508 while (!list_empty(&mdsc->cap_unlink_delay_list)) {
2509 struct ceph_inode_info *ci;
2510 struct inode *inode;
2511
2512 ci = list_first_entry(&mdsc->cap_unlink_delay_list,
2513 struct ceph_inode_info,
2514 i_cap_delay_list);
2515 list_del_init(&ci->i_cap_delay_list);
2516
2517 inode = igrab(&ci->netfs.inode);
2518 if (inode) {
17f8dc2d 2519 spin_unlock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2520 doutc(cl, "on %p %llx.%llx\n", inode,
2521 ceph_vinop(inode));
2522 ceph_check_caps(ci, CHECK_CAPS_FLUSH);
2523 iput(inode);
17f8dc2d 2524 spin_lock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2525 }
2526 }
17f8dc2d 2527 spin_unlock(&mdsc->cap_delay_lock);
dbc347ef
XL		 2528 doutc(cl, "done\n");
2529}
2530
2f2dc053
SW		 2531/*
2532 * requests
2533 */
2534
54008399
YZ		 2535int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2536 struct inode *dir)
2537{
2538 struct ceph_inode_info *ci = ceph_inode(dir);
2539 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2540 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2541 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
ad8c28a9
JL		 2542 unsigned int num_entries;
2543 int order;
54008399
YZ		 2544
2545 spin_lock(&ci->i_ceph_lock);
2546 num_entries = ci->i_files + ci->i_subdirs;
2547 spin_unlock(&ci->i_ceph_lock);
ad8c28a9 2548 num_entries = max(num_entries, 1U);
54008399
YZ		 2549 num_entries = min(num_entries, opt->max_readdir);
2550
2551 order = get_order(size * num_entries);
2552 while (order >= 0) {
2a5beea3 2553 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2941bf53
XL		 2554 __GFP_NOWARN |
2555 __GFP_ZERO,
2a5beea3
YZ		 2556 order);
2557 if (rinfo->dir_entries)
54008399
YZ		 2558 break;
2559 order--;
2560 }
2a5beea3 2561 if (!rinfo->dir_entries)
54008399
YZ		 2562 return -ENOMEM;
2563
2564 num_entries = (PAGE_SIZE << order) / size;
2565 num_entries = min(num_entries, opt->max_readdir);
2566
2567 rinfo->dir_buf_size = PAGE_SIZE << order;
2568 req->r_num_caps = num_entries + 1;
2569 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2570 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2571 return 0;
2572}
2573
2f2dc053
SW		 2574/*
2575 * Create an mds request.
2576 */
2577struct ceph_mds_request *
2578ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2579{
058daab7 2580 struct ceph_mds_request *req;
2f2dc053 2581
058daab7 2582 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2f2dc053
SW		 2583 if (!req)
2584 return ERR_PTR(-ENOMEM);
2585
b4556396 2586 mutex_init(&req->r_fill_mutex);
37151668 2587 req->r_mdsc = mdsc;
2f2dc053 2588 req->r_started = jiffies;
70c94820 2589 req->r_start_latency = ktime_get();
2f2dc053
SW		 2590 req->r_resend_mds = -1;
2591 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2592 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2593 req->r_fmode = -1;
6eb06c46 2594 req->r_feature_needed = -1;
153c8e6b 2595 kref_init(&req->r_kref);
fcd00b68 2596 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2597 INIT_LIST_HEAD(&req->r_wait);
2598 init_completion(&req->r_completion);
2599 init_completion(&req->r_safe_completion);
2600 INIT_LIST_HEAD(&req->r_unsafe_item);
2601
668c9a61 2602 ktime_get_coarse_real_ts64(&req->r_stamp);
b8e69066 2603
2f2dc053
SW		 2604 req->r_op = op;
2605 req->r_direct_mode = mode;
2606 return req;
2607}
2608
2609/*
44ca18f2 2610 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2611 *
2612 * called under mdsc->mutex.
2613 */
44ca18f2
SW		 2614static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2615{
2616 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2617 return NULL;
2618 return rb_entry(rb_first(&mdsc->request_tree),
2619 struct ceph_mds_request, r_node);
2620}
2621
e8a7b8b1 2622static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2623{
e8a7b8b1 2624 return mdsc->oldest_tid;
2f2dc053
SW		 2625}
2626
24865e75
JL		 2627#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2628static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2629{
2630 struct inode *dir = req->r_parent;
2631 struct dentry *dentry = req->r_dentry;
2632 u8 *cryptbuf = NULL;
2633 u32 len = 0;
2634 int ret = 0;
2635
2636 /* only encode if we have parent and dentry */
2637 if (!dir || !dentry)
2638 goto success;
2639
2640 /* No-op unless this is encrypted */
2641 if (!IS_ENCRYPTED(dir))
2642 goto success;
2643
14e034a6
LH		 2644 ret = ceph_fscrypt_prepare_readdir(dir);
2645 if (ret < 0)
24865e75
JL		 2646 return ERR_PTR(ret);
2647
2648 /* No key? Just ignore it. */
2649 if (!fscrypt_has_encryption_key(dir))
2650 goto success;
2651
2652 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX,
2653 &len)) {
2654 WARN_ON_ONCE(1);
2655 return ERR_PTR(-ENAMETOOLONG);
2656 }
2657
2658 /* No need to append altname if name is short enough */
2659 if (len <= CEPH_NOHASH_NAME_MAX) {
2660 len = 0;
2661 goto success;
2662 }
2663
2664 cryptbuf = kmalloc(len, GFP_KERNEL);
2665 if (!cryptbuf)
2666 return ERR_PTR(-ENOMEM);
2667
2668 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len);
2669 if (ret) {
2670 kfree(cryptbuf);
2671 return ERR_PTR(ret);
2672 }
2673success:
2674 *plen = len;
2675 return cryptbuf;
2676}
2677#else
2678static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2679{
2680 *plen = 0;
2681 return NULL;
2682}
2683#endif
2684
3fd945a7
JL		 2685/**
2686 * ceph_mdsc_build_path - build a path string to a given dentry
197b7d79 2687 * @mdsc: mds client
3fd945a7
JL		 2688 * @dentry: dentry to which path should be built
2689 * @plen: returned length of string
2690 * @pbase: returned base inode number
2691 * @for_wire: is this path going to be sent to the MDS?
2692 *
2693 * Build a string that represents the path to the dentry. This is mostly called
2694 * for two different purposes:
2695 *
2696 * 1) we need to build a path string to send to the MDS (for_wire == true)
2697 * 2) we need a path string for local presentation (e.g. debugfs)
2698 * (for_wire == false)
2f2dc053 2699 *
3fd945a7
JL		 2700 * The path is built in reverse, starting with the dentry. Walk back up toward
2701 * the root, building the path until the first non-snapped inode is reached
2702 * (for_wire) or the root inode is reached (!for_wire).
2f2dc053
SW		 2703 *
2704 * Encode hidden .snap dirs as a double /, i.e.
2705 * foo/.snap/bar -> foo//bar
2706 */
197b7d79
XL		 2707char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2708 int *plen, u64 *pbase, int for_wire)
2f2dc053 2709{
38d46409 2710 struct ceph_client *cl = mdsc->fsc->client;
4c793d4c
JL		 2711 struct dentry *cur;
2712 struct inode *inode;
2f2dc053 2713 char *path;
f77f21bb 2714 int pos;
1b71fe2e 2715 unsigned seq;
69a10fb3 2716 u64 base;
2f2dc053 2717
d37b1d99 2718 if (!dentry)
2f2dc053
SW		 2719 return ERR_PTR(-EINVAL);
2720
f77f21bb 2721 path = __getname();
d37b1d99 2722 if (!path)
2f2dc053 2723 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2724retry:
2725 pos = PATH_MAX - 1;
2726 path[pos] = '\0';
2727
2728 seq = read_seqbegin(&rename_lock);
4c793d4c 2729 cur = dget(dentry);
f77f21bb 2730 for (;;) {
3fd945a7 2731 struct dentry *parent;
2f2dc053 2732
4c793d4c
JL		 2733 spin_lock(&cur->d_lock);
2734 inode = d_inode(cur);
2f2dc053 2735 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
38d46409 2736 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
3fd945a7
JL		 2737 spin_unlock(&cur->d_lock);
2738 parent = dget_parent(cur);
2739 } else if (for_wire && inode && dentry != cur &&
2f2dc053 2740 ceph_snap(inode) == CEPH_NOSNAP) {
4c793d4c 2741 spin_unlock(&cur->d_lock);
d6b8bd67 2742 pos++; /* get rid of any prepended '/' */
2f2dc053 2743 break;
3fd945a7 2744 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
4c793d4c 2745 pos -= cur->d_name.len;
1b71fe2e 2746 if (pos < 0) {
4c793d4c 2747 spin_unlock(&cur->d_lock);
2f2dc053 2748 break;
1b71fe2e 2749 }
4c793d4c 2750 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
3fd945a7
JL		 2751 spin_unlock(&cur->d_lock);
2752 parent = dget_parent(cur);
2753 } else {
2754 int len, ret;
2755 char buf[NAME_MAX];
2756
2757 /*
2758 * Proactively copy name into buf, in case we need to
2759 * present it as-is.
2760 */
2761 memcpy(buf, cur->d_name.name, cur->d_name.len);
2762 len = cur->d_name.len;
2763 spin_unlock(&cur->d_lock);
2764 parent = dget_parent(cur);
2765
14e034a6 2766 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
3fd945a7
JL		 2767 if (ret < 0) {
2768 dput(parent);
2769 dput(cur);
2770 return ERR_PTR(ret);
2771 }
2772
2773 if (fscrypt_has_encryption_key(d_inode(parent))) {
2774 len = ceph_encode_encrypted_fname(d_inode(parent),
2775 cur, buf);
2776 if (len < 0) {
2777 dput(parent);
2778 dput(cur);
2779 return ERR_PTR(len);
2780 }
2781 }
2782 pos -= len;
2783 if (pos < 0) {
2784 dput(parent);
2785 break;
2786 }
2787 memcpy(path + pos, buf, len);
2f2dc053 2788 }
3fd945a7
JL		 2789 dput(cur);
2790 cur = parent;
f77f21bb
JL		 2791
2792 /* Are we at the root? */
4c793d4c 2793 if (IS_ROOT(cur))
f77f21bb
JL		 2794 break;
2795
2796 /* Are we out of buffer? */
2797 if (--pos < 0)
2798 break;
2799
2800 path[pos] = '/';
2f2dc053 2801 }
4c793d4c
JL		 2802 inode = d_inode(cur);
2803 base = inode ? ceph_ino(inode) : 0;
2804 dput(cur);
f5946bcc
JL		 2805
2806 if (read_seqretry(&rename_lock, seq))
2807 goto retry;
2808
2809 if (pos < 0) {
2810 /*
2811 * A rename didn't occur, but somehow we didn't end up where
2812 * we thought we would. Throw a warning and try again.
2813 */
38d46409
XL		 2814 pr_warn_client(cl, "did not end path lookup where expected (pos = %d)\n",
2815 pos);
2f2dc053
SW		 2816 goto retry;
2817 }
2818
69a10fb3 2819 *pbase = base;
f77f21bb 2820 *plen = PATH_MAX - 1 - pos;
38d46409
XL		 2821 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2822 base, *plen, path + pos);
f77f21bb 2823 return path + pos;
2f2dc053
SW		 2824}
2825
197b7d79
XL		 2826static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2827 struct inode *dir, const char **ppath, int *ppathlen,
2828 u64 *pino, bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2829{
2830 char *path;
2831
c6b0b656 2832 rcu_read_lock();
fd36a717
JL		 2833 if (!dir)
2834 dir = d_inode_rcu(dentry->d_parent);
3fd945a7
JL		 2835 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2836 !IS_ENCRYPTED(dir)) {
c6b0b656
JL		 2837 *pino = ceph_ino(dir);
2838 rcu_read_unlock();
964fff74
JL		 2839 *ppath = dentry->d_name.name;
2840 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2841 return 0;
2842 }
c6b0b656 2843 rcu_read_unlock();
197b7d79 2844 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2845 if (IS_ERR(path))
2846 return PTR_ERR(path);
2847 *ppath = path;
1bcb3440 2848 *pfreepath = true;
2f2dc053
SW		 2849 return 0;
2850}
2851
2852static int build_inode_path(struct inode *inode,
2853 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2854 bool *pfreepath)
2f2dc053 2855{
197b7d79 2856 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2f2dc053
SW		 2857 struct dentry *dentry;
2858 char *path;
2859
2860 if (ceph_snap(inode) == CEPH_NOSNAP) {
2861 *pino = ceph_ino(inode);
2862 *ppathlen = 0;
2863 return 0;
2864 }
2865 dentry = d_find_alias(inode);
197b7d79 2866 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2867 dput(dentry);
2868 if (IS_ERR(path))
2869 return PTR_ERR(path);
2870 *ppath = path;
1bcb3440 2871 *pfreepath = true;
2f2dc053
SW		 2872 return 0;
2873}
2874
2875/*
2876 * request arguments may be specified via an inode *, a dentry *, or
2877 * an explicit ino+path.
2878 */
197b7d79
XL		 2879static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2880 struct dentry *rdentry, struct inode *rdiri,
2881 const char *rpath, u64 rino, const char **ppath,
2882 int *pathlen, u64 *ino, bool *freepath,
2883 bool parent_locked)
2f2dc053 2884{
38d46409 2885 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2886 int r = 0;
2887
2888 if (rinode) {
2889 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
38d46409
XL		 2890 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2891 ceph_snap(rinode));
2f2dc053 2892 } else if (rdentry) {
197b7d79 2893 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2894 freepath, parent_locked);
38d46409 2895 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
795858db 2896 } else if (rpath || rino) {
2f2dc053
SW		 2897 *ino = rino;
2898 *ppath = rpath;
b000056a 2899 *pathlen = rpath ? strlen(rpath) : 0;
38d46409 2900 doutc(cl, " path %.*s\n", *pathlen, rpath);
2f2dc053
SW		 2901 }
2902
2903 return r;
2904}
2905
2d332d5b
JL		 2906static void encode_mclientrequest_tail(void **p,
2907 const struct ceph_mds_request *req)
60267ba3
ID		 2908{
2909 struct ceph_timespec ts;
2910 int i;
2911
2912 ceph_encode_timespec64(&ts, &req->r_stamp);
2913 ceph_encode_copy(p, &ts, sizeof(ts));
2914
24865e75 2915 /* v4: gid_list */
60267ba3
ID		 2916 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2917 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2918 ceph_encode_64(p, from_kgid(&init_user_ns,
2919 req->r_cred->group_info->gid[i]));
2d332d5b 2920
24865e75
JL		 2921 /* v5: altname */
2922 ceph_encode_32(p, req->r_altname_len);
2923 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2d332d5b
JL		 2924
2925 /* v6: fscrypt_auth and fscrypt_file */
2926 if (req->r_fscrypt_auth) {
2927 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2928
2929 ceph_encode_32(p, authlen);
2930 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2931 } else {
2932 ceph_encode_32(p, 0);
2933 }
16be62fc
JL		 2934 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2935 ceph_encode_32(p, sizeof(__le64));
2936 ceph_encode_64(p, req->r_fscrypt_file);
2937 } else {
2938 ceph_encode_32(p, 0);
2939 }
60267ba3
ID		 2940}
2941
5ccd8530
CB		 2942static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2943{
2944 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2945 return 1;
2946
2947 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2948 return 2;
2949
2950 return CEPH_MDS_REQUEST_HEAD_VERSION;
2951}
2952
ce0d5bd3
XL		 2953static struct ceph_mds_request_head_legacy *
2954find_legacy_request_head(void *p, u64 features)
2955{
2956 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2957 struct ceph_mds_request_head_old *ohead;
2958
2959 if (legacy)
2960 return (struct ceph_mds_request_head_legacy *)p;
2961 ohead = (struct ceph_mds_request_head_old *)p;
2962 return (struct ceph_mds_request_head_legacy *)&ohead->oldest_client_tid;
2963}
2964
2f2dc053
SW		 2965/*
2966 * called under mdsc->mutex
2967 */
4f1ddb1e 2968static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2f2dc053 2969 struct ceph_mds_request *req,
4f1ddb1e 2970 bool drop_cap_releases)
2f2dc053 2971{
4f1ddb1e
JL		 2972 int mds = session->s_mds;
2973 struct ceph_mds_client *mdsc = session->s_mdsc;
5ccd8530 2974 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 2975 struct ceph_msg *msg;
ce0d5bd3 2976 struct ceph_mds_request_head_legacy *lhead;
2f2dc053
SW		 2977 const char *path1 = NULL;
2978 const char *path2 = NULL;
2979 u64 ino1 = 0, ino2 = 0;
2980 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2981 bool freepath1 = false, freepath2 = false;
a5ffd7b6 2982 struct dentry *old_dentry = NULL;
60267ba3 2983 int len;
2f2dc053
SW		 2984 u16 releases;
2985 void *p, *end;
2986 int ret;
4f1ddb1e 2987 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
5ccd8530 2988 u16 request_head_version = mds_supported_head_version(session);
673478b6
AM		 2989 kuid_t caller_fsuid = req->r_cred->fsuid;
2990 kgid_t caller_fsgid = req->r_cred->fsgid;
2f2dc053 2991
197b7d79 2992 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
3dd69aab 2993 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2994 &path1, &pathlen1, &ino1, &freepath1,
2995 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2996 &req->r_req_flags));
2f2dc053
SW		 2997 if (ret < 0) {
2998 msg = ERR_PTR(ret);
2999 goto out;
3000 }
3001
1bcb3440 3002 /* If r_old_dentry is set, then assume that its parent is locked */
a5ffd7b6
XL		 3003 if (req->r_old_dentry &&
3004 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
3005 old_dentry = req->r_old_dentry;
197b7d79 3006 ret = set_request_path_attr(mdsc, NULL, old_dentry,
fd36a717 3007 req->r_old_dentry_dir,
2f2dc053 3008 req->r_path2, req->r_ino2.ino,
1bcb3440 3009 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 3010 if (ret < 0) {
3011 msg = ERR_PTR(ret);
3012 goto out_free1;
3013 }
3014
24865e75
JL		 3015 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
3016 if (IS_ERR(req->r_altname)) {
3017 msg = ERR_CAST(req->r_altname);
3018 req->r_altname = NULL;
3019 goto out_free2;
3020 }
3021
ce0d5bd3
XL		 3022 /*
3023 * For old cephs without supporting the 32bit retry/fwd feature
3024 * it will copy the raw memories directly when decoding the
3025 * requests. While new cephs will decode the head depending the
3026 * version member, so we need to make sure it will be compatible
3027 * with them both.
3028 */
3029 if (legacy)
3030 len = sizeof(struct ceph_mds_request_head_legacy);
5ccd8530 3031 else if (request_head_version == 1)
ce0d5bd3 3032 len = sizeof(struct ceph_mds_request_head_old);
5ccd8530
CB		 3033 else if (request_head_version == 2)
3034 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
ce0d5bd3
XL		 3035 else
3036 len = sizeof(struct ceph_mds_request_head);
2f2dc053 3037
2d332d5b
JL		 3038 /* filepaths */
3039 len += 2 * (1 + sizeof(u32) + sizeof(u64));
3040 len += pathlen1 + pathlen2;
3041
3042 /* cap releases */
2f2dc053
SW		 3043 len += sizeof(struct ceph_mds_request_release) *
3044 (!!req->r_inode_drop + !!req->r_dentry_drop +
3045 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
4f1ddb1e 3046
2f2dc053 3047 if (req->r_dentry_drop)
c1dfc277 3048 len += pathlen1;
2f2dc053 3049 if (req->r_old_dentry_drop)
c1dfc277 3050 len += pathlen2;
2f2dc053 3051
2d332d5b
JL		 3052 /* MClientRequest tail */
3053
3054 /* req->r_stamp */
3055 len += sizeof(struct ceph_timespec);
3056
3057 /* gid list */
3058 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3059
3060 /* alternate name */
24865e75 3061 len += sizeof(u32) + req->r_altname_len;
2d332d5b
JL		 3062
3063 /* fscrypt_auth */
3064 len += sizeof(u32); // fscrypt_auth
3065 if (req->r_fscrypt_auth)
3066 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3067
3068 /* fscrypt_file */
3069 len += sizeof(u32);
16be62fc
JL		 3070 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3071 len += sizeof(__le64);
2d332d5b 3072
0d9c1ab3 3073 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 3074 if (!msg) {
3075 msg = ERR_PTR(-ENOMEM);
2f2dc053 3076 goto out_free2;
a79832f2 3077 }
2f2dc053 3078
6df058c0
SW		 3079 msg->hdr.tid = cpu_to_le64(req->r_tid);
3080
ce0d5bd3
XL		 3081 lhead = find_legacy_request_head(msg->front.iov_base,
3082 session->s_con.peer_features);
3083
5ccd8530
CB		 3084 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3085 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3086 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3087
673478b6
AM		 3088 if (enable_unsafe_idmap) {
3089 pr_warn_once_client(cl,
3090 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3091 " is not supported by MDS. UID/GID-based restrictions may"
3092 " not work properly.\n");
5ccd8530 3093
673478b6
AM		 3094 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3095 VFSUIDT_INIT(req->r_cred->fsuid));
3096 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3097 VFSGIDT_INIT(req->r_cred->fsgid));
3098 } else {
3099 pr_err_ratelimited_client(cl,
3100 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3101 " is not supported by MDS. Fail request with -EIO.\n");
3102
3103 ret = -EIO;
3104 goto out_err;
3105 }
5ccd8530
CB		 3106 }
3107
4f1ddb1e 3108 /*
ce0d5bd3 3109 * The ceph_mds_request_head_legacy didn't contain a version field, and
4f1ddb1e
JL		 3110 * one was added when we moved the message version from 3->4.
3111 */
3112 if (legacy) {
3113 msg->hdr.version = cpu_to_le16(3);
ce0d5bd3 3114 p = msg->front.iov_base + sizeof(*lhead);
5ccd8530 3115 } else if (request_head_version == 1) {
ce0d5bd3
XL		 3116 struct ceph_mds_request_head_old *ohead = msg->front.iov_base;
3117
3118 msg->hdr.version = cpu_to_le16(4);
3119 ohead->version = cpu_to_le16(1);
3120 p = msg->front.iov_base + sizeof(*ohead);
5ccd8530
CB		 3121 } else if (request_head_version == 2) {
3122 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3123
3124 msg->hdr.version = cpu_to_le16(6);
3125 nhead->version = cpu_to_le16(2);
3126
3127 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
4f1ddb1e 3128 } else {
ce0d5bd3 3129 struct ceph_mds_request_head *nhead = msg->front.iov_base;
5ccd8530
CB		 3130 kuid_t owner_fsuid;
3131 kgid_t owner_fsgid;
4f1ddb1e 3132
2d332d5b 3133 msg->hdr.version = cpu_to_le16(6);
ce0d5bd3 3134 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
5ccd8530
CB		 3135 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3136
3137 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3138 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3139 VFSUIDT_INIT(req->r_cred->fsuid));
3140 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3141 VFSGIDT_INIT(req->r_cred->fsgid));
3142 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3143 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3144 } else {
3145 nhead->owner_uid = cpu_to_le32(-1);
3146 nhead->owner_gid = cpu_to_le32(-1);
3147 }
3148
ce0d5bd3 3149 p = msg->front.iov_base + sizeof(*nhead);
4f1ddb1e
JL		 3150 }
3151
2f2dc053
SW		 3152 end = msg->front.iov_base + msg->front.iov_len;
3153
ce0d5bd3
XL		 3154 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3155 lhead->op = cpu_to_le32(req->r_op);
3156 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
673478b6 3157 caller_fsuid));
ce0d5bd3 3158 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
673478b6 3159 caller_fsgid));
ce0d5bd3
XL		 3160 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3161 lhead->args = req->r_args;
2f2dc053
SW		 3162
3163 ceph_encode_filepath(&p, end, ino1, path1);
3164 ceph_encode_filepath(&p, end, ino2, path2);
3165
e979cf50
SW		 3166 /* make note of release offset, in case we need to replay */
3167 req->r_request_release_offset = p - msg->front.iov_base;
3168
2f2dc053
SW		 3169 /* cap releases */
3170 releases = 0;
3171 if (req->r_inode_drop)
3172 releases += ceph_encode_inode_release(&p,
2b0143b5 3173 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
719a2514
YZ		 3174 mds, req->r_inode_drop, req->r_inode_unless,
3175 req->r_op == CEPH_MDS_OP_READDIR);
3fd945a7
JL		 3176 if (req->r_dentry_drop) {
3177 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 3178 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 3179 req->r_dentry_unless);
3fd945a7
JL		 3180 if (ret < 0)
3181 goto out_err;
3182 releases += ret;
3183 }
3184 if (req->r_old_dentry_drop) {
3185 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 3186 req->r_old_dentry_dir, mds,
3187 req->r_old_dentry_drop,
3188 req->r_old_dentry_unless);
3fd945a7
JL		 3189 if (ret < 0)
3190 goto out_err;
3191 releases += ret;
3192 }
2f2dc053
SW		 3193 if (req->r_old_inode_drop)
3194 releases += ceph_encode_inode_release(&p,
2b0143b5 3195 d_inode(req->r_old_dentry),
2f2dc053 3196 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 3197
3198 if (drop_cap_releases) {
3199 releases = 0;
3200 p = msg->front.iov_base + req->r_request_release_offset;
3201 }
3202
ce0d5bd3 3203 lhead->num_releases = cpu_to_le16(releases);
2f2dc053 3204
2d332d5b 3205 encode_mclientrequest_tail(&p, req);
4f1ddb1e 3206
b682c6d4
XL		 3207 if (WARN_ON_ONCE(p > end)) {
3208 ceph_msg_put(msg);
3209 msg = ERR_PTR(-ERANGE);
3210 goto out_free2;
3211 }
3212
2f2dc053
SW		 3213 msg->front.iov_len = p - msg->front.iov_base;
3214 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3215
25e6bae3
YZ		 3216 if (req->r_pagelist) {
3217 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 3218 ceph_msg_data_add_pagelist(msg, pagelist);
3219 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3220 } else {
3221 msg->hdr.data_len = 0;
ebf18f47 3222 }
02afca6c 3223
2f2dc053
SW		 3224 msg->hdr.data_off = cpu_to_le16(0);
3225
3226out_free2:
3227 if (freepath2)
f77f21bb 3228 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 3229out_free1:
3230 if (freepath1)
f77f21bb 3231 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 3232out:
3233 return msg;
3fd945a7
JL		 3234out_err:
3235 ceph_msg_put(msg);
3236 msg = ERR_PTR(ret);
3237 goto out_free2;
2f2dc053
SW		 3238}
3239
3240/*
3241 * called under mdsc->mutex if error, under no mutex if
3242 * success.
3243 */
3244static void complete_request(struct ceph_mds_client *mdsc,
3245 struct ceph_mds_request *req)
3246{
70c94820
XL		 3247 req->r_end_latency = ktime_get();
3248
2f2dc053
SW		 3249 if (req->r_callback)
3250 req->r_callback(mdsc, req);
111c7081 3251 complete_all(&req->r_completion);
2f2dc053
SW		 3252}
3253
3254/*
3255 * called under mdsc->mutex
3256 */
396bd62c 3257static int __prepare_send_request(struct ceph_mds_session *session,
2f2dc053 3258 struct ceph_mds_request *req,
396bd62c 3259 bool drop_cap_releases)
2f2dc053 3260{
396bd62c
JL		 3261 int mds = session->s_mds;
3262 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3263 struct ceph_client *cl = mdsc->fsc->client;
ce0d5bd3
XL		 3264 struct ceph_mds_request_head_legacy *lhead;
3265 struct ceph_mds_request_head *nhead;
2f2dc053 3266 struct ceph_msg *msg;
ce0d5bd3
XL		 3267 int flags = 0, old_max_retry;
3268 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3269 &session->s_features);
546a5d61
XL		 3270
3271 /*
ce0d5bd3
XL		 3272 * Avoid inifinite retrying after overflow. The client will
3273 * increase the retry count and if the MDS is old version,
3274 * so we limit to retry at most 256 times.
546a5d61 3275 */
ce0d5bd3
XL		 3276 if (req->r_attempts) {
3277 old_max_retry = sizeof_field(struct ceph_mds_request_head_old,
3278 num_retry);
3279 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3280 if ((old_version && req->r_attempts >= old_max_retry) ||
3281 ((uint32_t)req->r_attempts >= U32_MAX)) {
38d46409
XL		 3282 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3283 req->r_tid);
ce0d5bd3
XL		 3284 return -EMULTIHOP;
3285 }
546a5d61 3286 }
2f2dc053 3287
2f2dc053 3288 req->r_attempts++;
e55b71f8
GF		 3289 if (req->r_inode) {
3290 struct ceph_cap *cap =
3291 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3292
3293 if (cap)
3294 req->r_sent_on_mseq = cap->mseq;
3295 else
3296 req->r_sent_on_mseq = -1;
3297 }
38d46409
XL		 3298 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3299 ceph_mds_op_name(req->r_op), req->r_attempts);
2f2dc053 3300
bc2de10d 3301 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 3302 void *p;
4f1ddb1e 3303
01a92f17
SW		 3304 /*
3305 * Replay. Do not regenerate message (and rebuild
3306 * paths, etc.); just use the original message.
3307 * Rebuilding paths will break for renames because
3308 * d_move mangles the src name.
3309 */
3310 msg = req->r_request;
ce0d5bd3
XL		 3311 lhead = find_legacy_request_head(msg->front.iov_base,
3312 session->s_con.peer_features);
01a92f17 3313
ce0d5bd3 3314 flags = le32_to_cpu(lhead->flags);
01a92f17 3315 flags |= CEPH_MDS_FLAG_REPLAY;
ce0d5bd3 3316 lhead->flags = cpu_to_le32(flags);
01a92f17
SW		 3317
3318 if (req->r_target_inode)
ce0d5bd3 3319 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
01a92f17 3320
ce0d5bd3
XL		 3321 lhead->num_retry = req->r_attempts - 1;
3322 if (!old_version) {
3323 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3324 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3325 }
e979cf50
SW		 3326
3327 /* remove cap/dentry releases from message */
ce0d5bd3 3328 lhead->num_releases = 0;
c5c9a0bf 3329
c5c9a0bf 3330 p = msg->front.iov_base + req->r_request_release_offset;
2d332d5b 3331 encode_mclientrequest_tail(&p, req);
c5c9a0bf
YZ		 3332
3333 msg->front.iov_len = p - msg->front.iov_base;
3334 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 3335 return 0;
3336 }
3337
2f2dc053
SW		 3338 if (req->r_request) {
3339 ceph_msg_put(req->r_request);
3340 req->r_request = NULL;
3341 }
4f1ddb1e 3342 msg = create_request_message(session, req, drop_cap_releases);
2f2dc053 3343 if (IS_ERR(msg)) {
e1518c7c 3344 req->r_err = PTR_ERR(msg);
a79832f2 3345 return PTR_ERR(msg);
2f2dc053
SW		 3346 }
3347 req->r_request = msg;
3348
ce0d5bd3
XL		 3349 lhead = find_legacy_request_head(msg->front.iov_base,
3350 session->s_con.peer_features);
3351 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 3352 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 3353 flags |= CEPH_MDS_FLAG_REPLAY;
3bb48b41
JL		 3354 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3355 flags |= CEPH_MDS_FLAG_ASYNC;
3dd69aab 3356 if (req->r_parent)
2f2dc053 3357 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
ce0d5bd3
XL		 3358 lhead->flags = cpu_to_le32(flags);
3359 lhead->num_fwd = req->r_num_fwd;
3360 lhead->num_retry = req->r_attempts - 1;
3361 if (!old_version) {
3362 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3363 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3364 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3365 }
2f2dc053 3366
38d46409 3367 doutc(cl, " r_parent = %p\n", req->r_parent);
2f2dc053
SW		 3368 return 0;
3369}
3370
9cf54563
XL		 3371/*
3372 * called under mdsc->mutex
3373 */
396bd62c 3374static int __send_request(struct ceph_mds_session *session,
9cf54563
XL		 3375 struct ceph_mds_request *req,
3376 bool drop_cap_releases)
3377{
3378 int err;
3379
396bd62c 3380 err = __prepare_send_request(session, req, drop_cap_releases);
9cf54563
XL		 3381 if (!err) {
3382 ceph_msg_get(req->r_request);
3383 ceph_con_send(&session->s_con, req->r_request);
3384 }
3385
3386 return err;
3387}
3388
2f2dc053
SW		 3389/*
3390 * send request, or put it on the appropriate wait list.
3391 */
d5548492 3392static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 3393 struct ceph_mds_request *req)
3394{
38d46409 3395 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3396 struct ceph_mds_session *session = NULL;
3397 int mds = -1;
48fec5d0 3398 int err = 0;
c4853e97 3399 bool random;
2f2dc053 3400
bc2de10d
JL		 3401 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3402 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 3403 __unregister_request(mdsc, req);
d5548492 3404 return;
eb1b8af3 3405 }
2f2dc053 3406
a68e564a 3407 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
38d46409 3408 doutc(cl, "metadata corrupted\n");
a68e564a
XL		 3409 err = -EIO;
3410 goto finish;
3411 }
2f2dc053
SW		 3412 if (req->r_timeout &&
3413 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
38d46409 3414 doutc(cl, "timed out\n");
8ccf7fcc 3415 err = -ETIMEDOUT;
2f2dc053
SW		 3416 goto finish;
3417 }
52953d55 3418 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
38d46409 3419 doutc(cl, "forced umount\n");
48fec5d0
YZ		 3420 err = -EIO;
3421 goto finish;
3422 }
52953d55 3423 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 3424 if (mdsc->mdsmap_err) {
3425 err = mdsc->mdsmap_err;
38d46409 3426 doutc(cl, "mdsmap err %d\n", err);
e9e427f0
YZ		 3427 goto finish;
3428 }
cc8e8342 3429 if (mdsc->mdsmap->m_epoch == 0) {
38d46409 3430 doutc(cl, "no mdsmap, waiting for map\n");
cc8e8342 3431 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3432 return;
cc8e8342 3433 }
e9e427f0
YZ		 3434 if (!(mdsc->fsc->mount_options->flags &
3435 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3436 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
97820058 3437 err = -EHOSTUNREACH;
e9e427f0
YZ		 3438 goto finish;
3439 }
3440 }
2f2dc053 3441
dc69e2e9
SW		 3442 put_request_session(req);
3443
c4853e97 3444 mds = __choose_mds(mdsc, req, &random);
2f2dc053
SW		 3445 if (mds < 0 ||
3446 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3bb48b41
JL		 3447 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3448 err = -EJUKEBOX;
3449 goto finish;
3450 }
38d46409 3451 doutc(cl, "no mds or not active, waiting for map\n");
2f2dc053 3452 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3453 return;
2f2dc053
SW		 3454 }
3455
3456 /* get, open session */
3457 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 3458 if (!session) {
2f2dc053 3459 session = register_session(mdsc, mds);
9c423956
SW		 3460 if (IS_ERR(session)) {
3461 err = PTR_ERR(session);
3462 goto finish;
3463 }
3464 }
5b3248c6 3465 req->r_session = ceph_get_mds_session(session);
dc69e2e9 3466
38d46409
XL		 3467 doutc(cl, "mds%d session %p state %s\n", mds, session,
3468 ceph_session_state_name(session->s_state));
6eb06c46
XL		 3469
3470 /*
3471 * The old ceph will crash the MDSs when see unknown OPs
3472 */
3473 if (req->r_feature_needed > 0 &&
3474 !test_bit(req->r_feature_needed, &session->s_features)) {
3475 err = -EOPNOTSUPP;
3476 goto out_session;
3477 }
3478
2f2dc053
SW		 3479 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3480 session->s_state != CEPH_MDS_SESSION_HUNG) {
3bb48b41
JL		 3481 /*
3482 * We cannot queue async requests since the caps and delegated
3483 * inodes are bound to the session. Just return -EJUKEBOX and
3484 * let the caller retry a sync request in that case.
3485 */
3486 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3487 err = -EJUKEBOX;
3488 goto out_session;
3489 }
4ae3713f
JL		 3490
3491 /*
3492 * If the session has been REJECTED, then return a hard error,
3493 * unless it's a CLEANRECOVER mount, in which case we'll queue
3494 * it to the mdsc queue.
3495 */
3496 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3497 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3498 list_add(&req->r_wait, &mdsc->waiting_for_map);
3499 else
3500 err = -EACCES;
3501 goto out_session;
3502 }
3503
2f2dc053 3504 if (session->s_state == CEPH_MDS_SESSION_NEW ||
c4853e97 3505 session->s_state == CEPH_MDS_SESSION_CLOSING) {
b682c6d4
XL		 3506 err = __open_session(mdsc, session);
3507 if (err)
3508 goto out_session;
c4853e97
XL		 3509 /* retry the same mds later */
3510 if (random)
3511 req->r_resend_mds = mds;
3512 }
2f2dc053
SW		 3513 list_add(&req->r_wait, &session->s_waiting);
3514 goto out_session;
3515 }
3516
3517 /* send request */
2f2dc053
SW		 3518 req->r_resend_mds = -1; /* forget any previous mds hint */
3519
3520 if (req->r_request_started == 0) /* note request start time */
3521 req->r_request_started = jiffies;
3522
00061645
XL		 3523 /*
3524 * For async create we will choose the auth MDS of frag in parent
3525 * directory to send the request and ususally this works fine, but
3526 * if the migrated the dirtory to another MDS before it could handle
3527 * it the request will be forwarded.
3528 *
3529 * And then the auth cap will be changed.
3530 */
3531 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3532 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3533 struct ceph_inode_info *ci;
3534 struct ceph_cap *cap;
3535
3536 /*
3537 * The request maybe handled very fast and the new inode
3538 * hasn't been linked to the dentry yet. We need to wait
3539 * for the ceph_finish_async_create(), which shouldn't be
3540 * stuck too long or fail in thoery, to finish when forwarding
3541 * the request.
3542 */
3543 if (!d_inode(req->r_dentry)) {
3544 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3545 TASK_KILLABLE);
3546 if (err) {
3547 mutex_lock(&req->r_fill_mutex);
3548 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3549 mutex_unlock(&req->r_fill_mutex);
3550 goto out_session;
3551 }
3552 }
3553
3554 ci = ceph_inode(d_inode(req->r_dentry));
3555
3556 spin_lock(&ci->i_ceph_lock);
3557 cap = ci->i_auth_cap;
3558 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
38d46409
XL		 3559 doutc(cl, "session changed for auth cap %d -> %d\n",
3560 cap->session->s_mds, session->s_mds);
00061645
XL		 3561
3562 /* Remove the auth cap from old session */
3563 spin_lock(&cap->session->s_cap_lock);
3564 cap->session->s_nr_caps--;
3565 list_del_init(&cap->session_caps);
3566 spin_unlock(&cap->session->s_cap_lock);
3567
3568 /* Add the auth cap to the new session */
3569 cap->mds = mds;
3570 cap->session = session;
3571 spin_lock(&session->s_cap_lock);
3572 session->s_nr_caps++;
3573 list_add_tail(&cap->session_caps, &session->s_caps);
3574 spin_unlock(&session->s_cap_lock);
3575
3576 change_auth_cap_ses(ci, session);
3577 }
3578 spin_unlock(&ci->i_ceph_lock);
3579 }
3580
396bd62c 3581 err = __send_request(session, req, false);
2f2dc053
SW		 3582
3583out_session:
3584 ceph_put_mds_session(session);
48fec5d0
YZ		 3585finish:
3586 if (err) {
38d46409 3587 doutc(cl, "early error %d\n", err);
48fec5d0
YZ		 3588 req->r_err = err;
3589 complete_request(mdsc, req);
3590 __unregister_request(mdsc, req);
3591 }
d5548492 3592 return;
2f2dc053
SW		 3593}
3594
3595/*
3596 * called under mdsc->mutex
3597 */
3598static void __wake_requests(struct ceph_mds_client *mdsc,
3599 struct list_head *head)
3600{
38d46409 3601 struct ceph_client *cl = mdsc->fsc->client;
ed75ec2c
YZ		 3602 struct ceph_mds_request *req;
3603 LIST_HEAD(tmp_list);
3604
3605 list_splice_init(head, &tmp_list);
2f2dc053 3606
ed75ec2c
YZ		 3607 while (!list_empty(&tmp_list)) {
3608 req = list_entry(tmp_list.next,
3609 struct ceph_mds_request, r_wait);
2f2dc053 3610 list_del_init(&req->r_wait);
38d46409
XL		 3611 doutc(cl, " wake request %p tid %llu\n", req,
3612 req->r_tid);
2f2dc053
SW		 3613 __do_request(mdsc, req);
3614 }
3615}
3616
3617/*
3618 * Wake up threads with requests pending for @mds, so that they can
29790f26 3619 * resubmit their requests to a possibly different mds.
2f2dc053 3620 */
29790f26 3621static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 3622{
38d46409 3623 struct ceph_client *cl = mdsc->fsc->client;
44ca18f2 3624 struct ceph_mds_request *req;
282c1052 3625 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053 3626
38d46409 3627 doutc(cl, "kick_requests mds%d\n", mds);
282c1052 3628 while (p) {
44ca18f2 3629 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 3630 p = rb_next(p);
bc2de10d 3631 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 3632 continue;
3de22be6
YZ		 3633 if (req->r_attempts > 0)
3634 continue; /* only new requests */
44ca18f2
SW		 3635 if (req->r_session &&
3636 req->r_session->s_mds == mds) {
38d46409 3637 doutc(cl, " kicking tid %llu\n", req->r_tid);
03974e81 3638 list_del_init(&req->r_wait);
44ca18f2 3639 __do_request(mdsc, req);
2f2dc053
SW		 3640 }
3641 }
3642}
3643
86bda539 3644int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 3645 struct ceph_mds_request *req)
3646{
38d46409 3647 struct ceph_client *cl = mdsc->fsc->client;
891f3f5a 3648 int err = 0;
86bda539
JL		 3649
3650 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3651 if (req->r_inode)
3652 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
9c1c2b35 3653 if (req->r_parent) {
719a2514
YZ		 3654 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3655 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3656 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3657 spin_lock(&ci->i_ceph_lock);
3658 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3659 __ceph_touch_fmode(ci, mdsc, fmode);
3660 spin_unlock(&ci->i_ceph_lock);
9c1c2b35 3661 }
86bda539
JL		 3662 if (req->r_old_dentry_dir)
3663 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3664 CEPH_CAP_PIN);
3665
891f3f5a
JL		 3666 if (req->r_inode) {
3667 err = ceph_wait_on_async_create(req->r_inode);
3668 if (err) {
38d46409 3669 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3670 return err;
3671 }
3672 }
3673
3674 if (!err && req->r_old_inode) {
3675 err = ceph_wait_on_async_create(req->r_old_inode);
3676 if (err) {
38d46409 3677 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3678 return err;
3679 }
3680 }
3681
38d46409 3682 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
2f2dc053 3683 mutex_lock(&mdsc->mutex);
86bda539 3684 __register_request(mdsc, req, dir);
2f2dc053 3685 __do_request(mdsc, req);
86bda539 3686 err = req->r_err;
2f2dc053 3687 mutex_unlock(&mdsc->mutex);
86bda539 3688 return err;
2f2dc053
SW		 3689}
3690
9eaa7b79
JL		 3691int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3692 struct ceph_mds_request *req,
3693 ceph_mds_request_wait_callback_t wait_func)
2f2dc053 3694{
38d46409 3695 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3696 int err;
3697
e1518c7c 3698 /* wait */
38d46409 3699 doutc(cl, "do_request waiting\n");
9eaa7b79
JL		 3700 if (wait_func) {
3701 err = wait_func(mdsc, req);
e1518c7c 3702 } else {
5be73034
ID		 3703 long timeleft = wait_for_completion_killable_timeout(
3704 &req->r_completion,
3705 ceph_timeout_jiffies(req->r_timeout));
3706 if (timeleft > 0)
3707 err = 0;
3708 else if (!timeleft)
8ccf7fcc 3709 err = -ETIMEDOUT; /* timed out */
5be73034
ID		 3710 else
3711 err = timeleft; /* killed */
e1518c7c 3712 }
38d46409 3713 doutc(cl, "do_request waited, got %d\n", err);
e1518c7c 3714 mutex_lock(&mdsc->mutex);
5b1daecd 3715
e1518c7c 3716 /* only abort if we didn't race with a real reply */
bc2de10d 3717 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 3718 err = le32_to_cpu(req->r_reply_info.head->result);
3719 } else if (err < 0) {
38d46409 3720 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 3721
3722 /*
3723 * ensure we aren't running concurrently with
3724 * ceph_fill_trace or ceph_readdir_prepopulate, which
3725 * rely on locks (dir mutex) held by our caller.
3726 */
3727 mutex_lock(&req->r_fill_mutex);
e1518c7c 3728 req->r_err = err;
bc2de10d 3729 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 3730 mutex_unlock(&req->r_fill_mutex);
5b1daecd 3731
3dd69aab 3732 if (req->r_parent &&
167c9e35
SW		 3733 (req->r_op & CEPH_MDS_OP_WRITE))
3734 ceph_invalidate_dir_request(req);
2f2dc053 3735 } else {
e1518c7c 3736 err = req->r_err;
2f2dc053 3737 }
2f2dc053 3738
e1518c7c 3739 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 3740 return err;
3741}
3742
3743/*
3744 * Synchrously perform an mds request. Take care of all of the
3745 * session setup, forwarding, retry details.
3746 */
3747int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3748 struct inode *dir,
3749 struct ceph_mds_request *req)
3750{
38d46409 3751 struct ceph_client *cl = mdsc->fsc->client;
8340f22c
JL		 3752 int err;
3753
38d46409 3754 doutc(cl, "do_request on %p\n", req);
8340f22c
JL		 3755
3756 /* issue */
3757 err = ceph_mdsc_submit_request(mdsc, dir, req);
3758 if (!err)
9eaa7b79 3759 err = ceph_mdsc_wait_request(mdsc, req, NULL);
38d46409 3760 doutc(cl, "do_request %p done, result %d\n", req, err);
2f2dc053
SW		 3761 return err;
3762}
3763
167c9e35 3764/*
2f276c51 3765 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 3766 * namespace request.
3767 */
3768void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3769{
8d8f371c
YZ		 3770 struct inode *dir = req->r_parent;
3771 struct inode *old_dir = req->r_old_dentry_dir;
38d46409 3772 struct ceph_client *cl = req->r_mdsc->fsc->client;
167c9e35 3773
38d46409
XL		 3774 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3775 dir, old_dir);
167c9e35 3776
8d8f371c
YZ		 3777 ceph_dir_clear_complete(dir);
3778 if (old_dir)
3779 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 3780 if (req->r_dentry)
3781 ceph_invalidate_dentry_lease(req->r_dentry);
3782 if (req->r_old_dentry)
3783 ceph_invalidate_dentry_lease(req->r_old_dentry);
3784}
3785
2f2dc053
SW		 3786/*
3787 * Handle mds reply.
3788 *
3789 * We take the session mutex and parse and process the reply immediately.
3790 * This preserves the logical ordering of replies, capabilities, etc., sent
3791 * by the MDS as they are applied to our local cache.
3792 */
3793static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3794{
3795 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3796 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3797 struct ceph_mds_request *req;
3798 struct ceph_mds_reply_head *head = msg->front.iov_base;
3799 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 3800 struct ceph_snap_realm *realm;
2f2dc053
SW		 3801 u64 tid;
3802 int err, result;
2600d2dd 3803 int mds = session->s_mds;
a68e564a 3804 bool close_sessions = false;
2f2dc053 3805
2f2dc053 3806 if (msg->front.iov_len < sizeof(*head)) {
38d46409 3807 pr_err_client(cl, "got corrupt (short) reply\n");
9ec7cab1 3808 ceph_msg_dump(msg);
2f2dc053
SW		 3809 return;
3810 }
3811
3812 /* get request, session */
6df058c0 3813 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 3814 mutex_lock(&mdsc->mutex);
fcd00b68 3815 req = lookup_get_request(mdsc, tid);
2f2dc053 3816 if (!req) {
38d46409 3817 doutc(cl, "on unknown tid %llu\n", tid);
2f2dc053
SW		 3818 mutex_unlock(&mdsc->mutex);
3819 return;
3820 }
38d46409 3821 doutc(cl, "handle_reply %p\n", req);
2f2dc053
SW		 3822
3823 /* correct session? */
d96d6049 3824 if (req->r_session != session) {
38d46409
XL		 3825 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3826 tid, session->s_mds,
3827 req->r_session ? req->r_session->s_mds : -1);
2f2dc053
SW		 3828 mutex_unlock(&mdsc->mutex);
3829 goto out;
3830 }
3831
3832 /* dup? */
bc2de10d
JL		 3833 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3834 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
38d46409
XL		 3835 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3836 head->safe ? "safe" : "unsafe", tid, mds);
2f2dc053
SW		 3837 mutex_unlock(&mdsc->mutex);
3838 goto out;
3839 }
bc2de10d 3840 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
38d46409
XL		 3841 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3842 tid, mds);
85792d0d
SW		 3843 mutex_unlock(&mdsc->mutex);
3844 goto out;
3845 }
2f2dc053
SW		 3846
3847 result = le32_to_cpu(head->result);
3848
2f2dc053 3849 if (head->safe) {
bc2de10d 3850 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 3851 __unregister_request(mdsc, req);
2f2dc053 3852
07edc057
XL		 3853 /* last request during umount? */
3854 if (mdsc->stopping && !__get_oldest_req(mdsc))
3855 complete_all(&mdsc->safe_umount_waiters);
3856
bc2de10d 3857 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 3858 /*
3859 * We already handled the unsafe response, now do the
3860 * cleanup. No need to examine the response; the MDS
3861 * doesn't include any result info in the safe
3862 * response. And even if it did, there is nothing
3863 * useful we could do with a revised return value.
3864 */
38d46409 3865 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
2f2dc053 3866
2f2dc053
SW		 3867 mutex_unlock(&mdsc->mutex);
3868 goto out;
3869 }
e1518c7c 3870 } else {
bc2de10d 3871 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053
SW		 3872 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3873 }
3874
38d46409 3875 doutc(cl, "tid %lld result %d\n", tid, result);
b37fe1f9 3876 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3859af9e 3877 err = parse_reply_info(session, msg, req, (u64)-1);
b37fe1f9 3878 else
3859af9e
XL		 3879 err = parse_reply_info(session, msg, req,
3880 session->s_con.peer_features);
2f2dc053
SW		 3881 mutex_unlock(&mdsc->mutex);
3882
bca9fc14 3883 /* Must find target inode outside of mutexes to avoid deadlocks */
3859af9e 3884 rinfo = &req->r_reply_info;
bca9fc14 3885 if ((err >= 0) && rinfo->head->is_target) {
ec9595c0 3886 struct inode *in = xchg(&req->r_new_inode, NULL);
bca9fc14
JL		 3887 struct ceph_vino tvino = {
3888 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3889 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3890 };
3891
ec9595c0
JL		 3892 /*
3893 * If we ended up opening an existing inode, discard
3894 * r_new_inode
3895 */
3896 if (req->r_op == CEPH_MDS_OP_CREATE &&
3897 !req->r_reply_info.has_create_ino) {
3898 /* This should never happen on an async create */
3899 WARN_ON_ONCE(req->r_deleg_ino);
3900 iput(in);
3901 in = NULL;
3902 }
3903
3904 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
bca9fc14
JL		 3905 if (IS_ERR(in)) {
3906 err = PTR_ERR(in);
3907 mutex_lock(&session->s_mutex);
3908 goto out_err;
3909 }
3910 req->r_target_inode = in;
3911 }
3912
2f2dc053
SW		 3913 mutex_lock(&session->s_mutex);
3914 if (err < 0) {
38d46409
XL		 3915 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3916 mds, tid);
9ec7cab1 3917 ceph_msg_dump(msg);
2f2dc053
SW		 3918 goto out_err;
3919 }
3920
3921 /* snap trace */
982d6011 3922 realm = NULL;
2f2dc053
SW		 3923 if (rinfo->snapblob_len) {
3924 down_write(&mdsc->snap_rwsem);
a68e564a 3925 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 3926 rinfo->snapblob + rinfo->snapblob_len,
3927 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3928 &realm);
a68e564a
XL		 3929 if (err) {
3930 up_write(&mdsc->snap_rwsem);
3931 close_sessions = true;
3932 if (err == -EIO)
3933 ceph_msg_dump(msg);
3934 goto out_err;
3935 }
2f2dc053
SW		 3936 downgrade_write(&mdsc->snap_rwsem);
3937 } else {
3938 down_read(&mdsc->snap_rwsem);
3939 }
3940
3941 /* insert trace into our cache */
b4556396 3942 mutex_lock(&req->r_fill_mutex);
315f2408 3943 current->journal_info = req;
f5a03b08 3944 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 3945 if (err == 0) {
6e8575fa 3946 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 3947 req->r_op == CEPH_MDS_OP_LSSNAP))
af9ffa6d 3948 err = ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 3949 }
315f2408 3950 current->journal_info = NULL;
b4556396 3951 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 3952
3953 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 3954 if (realm)
3955 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 3956
fe33032d
YZ		 3957 if (err == 0) {
3958 if (req->r_target_inode &&
3959 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3960 struct ceph_inode_info *ci =
3961 ceph_inode(req->r_target_inode);
3962 spin_lock(&ci->i_unsafe_lock);
3963 list_add_tail(&req->r_unsafe_target_item,
3964 &ci->i_unsafe_iops);
3965 spin_unlock(&ci->i_unsafe_lock);
3966 }
3967
3968 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 3969 }
2f2dc053 3970out_err:
e1518c7c 3971 mutex_lock(&mdsc->mutex);
bc2de10d 3972 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 3973 if (err) {
3974 req->r_err = err;
3975 } else {
5fdb1389 3976 req->r_reply = ceph_msg_get(msg);
bc2de10d 3977 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 3978 }
2f2dc053 3979 } else {
38d46409 3980 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
2f2dc053 3981 }
e1518c7c 3982 mutex_unlock(&mdsc->mutex);
2f2dc053 3983
2f2dc053
SW		 3984 mutex_unlock(&session->s_mutex);
3985
3986 /* kick calling process */
3987 complete_request(mdsc, req);
70c94820 3988
8ae99ae2 3989 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
70c94820 3990 req->r_end_latency, err);
2f2dc053
SW		 3991out:
3992 ceph_mdsc_put_request(req);
a68e564a
XL		 3993
3994 /* Defer closing the sessions after s_mutex lock being released */
3995 if (close_sessions)
3996 ceph_mdsc_close_sessions(mdsc);
2f2dc053
SW		 3997 return;
3998}
3999
4000
4001
4002/*
4003 * handle mds notification that our request has been forwarded.
4004 */
2600d2dd
SW		 4005static void handle_forward(struct ceph_mds_client *mdsc,
4006 struct ceph_mds_session *session,
4007 struct ceph_msg *msg)
2f2dc053 4008{
38d46409 4009 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4010 struct ceph_mds_request *req;
a1ea787c 4011 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 4012 u32 next_mds;
4013 u32 fwd_seq;
2f2dc053
SW		 4014 int err = -EINVAL;
4015 void *p = msg->front.iov_base;
4016 void *end = p + msg->front.iov_len;
1980b1bf 4017 bool aborted = false;
2f2dc053 4018
a1ea787c 4019 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 4020 next_mds = ceph_decode_32(&p);
4021 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 4022
4023 mutex_lock(&mdsc->mutex);
fcd00b68 4024 req = lookup_get_request(mdsc, tid);
2f2dc053 4025 if (!req) {
1980b1bf 4026 mutex_unlock(&mdsc->mutex);
38d46409 4027 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
1980b1bf 4028 return; /* dup reply? */
2f2dc053
SW		 4029 }
4030
bc2de10d 4031 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
38d46409 4032 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
2a8e5e36 4033 __unregister_request(mdsc, req);
ce0d5bd3 4034 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
1980b1bf 4035 /*
ce0d5bd3 4036 * Avoid inifinite retrying after overflow.
1980b1bf 4037 *
ce0d5bd3
XL		 4038 * The MDS will increase the fwd count and in client side
4039 * if the num_fwd is less than the one saved in request
4040 * that means the MDS is an old version and overflowed of
4041 * 8 bits.
1980b1bf 4042 */
ce0d5bd3
XL		 4043 mutex_lock(&req->r_fill_mutex);
4044 req->r_err = -EMULTIHOP;
4045 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
4046 mutex_unlock(&req->r_fill_mutex);
4047 aborted = true;
38d46409
XL		 4048 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
4049 tid);
2f2dc053
SW		 4050 } else {
4051 /* resend. forward race not possible; mds would drop */
38d46409 4052 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2a8e5e36 4053 BUG_ON(req->r_err);
bc2de10d 4054 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 4055 req->r_attempts = 0;
2f2dc053
SW		 4056 req->r_num_fwd = fwd_seq;
4057 req->r_resend_mds = next_mds;
4058 put_request_session(req);
4059 __do_request(mdsc, req);
4060 }
2f2dc053 4061 mutex_unlock(&mdsc->mutex);
1980b1bf
XL		 4062
4063 /* kick calling process */
4064 if (aborted)
4065 complete_request(mdsc, req);
4066 ceph_mdsc_put_request(req);
2f2dc053
SW		 4067 return;
4068
4069bad:
38d46409 4070 pr_err_client(cl, "decode error err=%d\n", err);
8b0da5c5 4071 ceph_msg_dump(msg);
2f2dc053
SW		 4072}
4073
131d7eb4 4074static int __decode_session_metadata(void **p, void *end,
0b98acd6 4075 bool *blocklisted)
84bf3950
YZ		 4076{
4077 /* map<string,string> */
4078 u32 n;
131d7eb4 4079 bool err_str;
84bf3950
YZ		 4080 ceph_decode_32_safe(p, end, n, bad);
4081 while (n-- > 0) {
4082 u32 len;
4083 ceph_decode_32_safe(p, end, len, bad);
4084 ceph_decode_need(p, end, len, bad);
131d7eb4 4085 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 4086 *p += len;
4087 ceph_decode_32_safe(p, end, len, bad);
4088 ceph_decode_need(p, end, len, bad);
4bb926e8
ID		 4089 /*
4090 * Match "blocklisted (blacklisted)" from newer MDSes,
4091 * or "blacklisted" from older MDSes.
4092 */
131d7eb4 4093 if (err_str && strnstr(*p, "blacklisted", len))
0b98acd6 4094 *blocklisted = true;
84bf3950
YZ		 4095 *p += len;
4096 }
4097 return 0;
4098bad:
4099 return -1;
4100}
4101
2f2dc053
SW		 4102/*
4103 * handle a mds session control message
4104 */
4105static void handle_session(struct ceph_mds_session *session,
4106 struct ceph_msg *msg)
4107{
4108 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 4109 struct ceph_client *cl = mdsc->fsc->client;
84bf3950
YZ		 4110 int mds = session->s_mds;
4111 int msg_version = le16_to_cpu(msg->hdr.version);
4112 void *p = msg->front.iov_base;
4113 void *end = p + msg->front.iov_len;
4114 struct ceph_mds_session_head *h;
2f2dc053 4115 u32 op;
0fa82633 4116 u64 seq, features = 0;
2f2dc053 4117 int wake = 0;
0b98acd6 4118 bool blocklisted = false;
2f2dc053 4119
2f2dc053 4120 /* decode */
84bf3950
YZ		 4121 ceph_decode_need(&p, end, sizeof(*h), bad);
4122 h = p;
4123 p += sizeof(*h);
4124
2f2dc053
SW		 4125 op = le32_to_cpu(h->op);
4126 seq = le64_to_cpu(h->seq);
4127
84bf3950
YZ		 4128 if (msg_version >= 3) {
4129 u32 len;
e1c9788c
KH		 4130 /* version >= 2 and < 5, decode metadata, skip otherwise
4131 * as it's handled via flags.
4132 */
4133 if (msg_version >= 5)
4134 ceph_decode_skip_map(&p, end, string, string, bad);
4135 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
84bf3950 4136 goto bad;
e1c9788c 4137
84bf3950
YZ		 4138 /* version >= 3, feature bits */
4139 ceph_decode_32_safe(&p, end, len, bad);
02e37571
JL		 4140 if (len) {
4141 ceph_decode_64_safe(&p, end, features, bad);
4142 p += len - sizeof(features);
4143 }
84bf3950
YZ		 4144 }
4145
e1c9788c 4146 if (msg_version >= 5) {
ea16567f
LH		 4147 u32 flags, len;
4148
4149 /* version >= 4 */
4150 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4151 ceph_decode_32_safe(&p, end, len, bad); /* len */
4152 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4153
e1c9788c 4154 /* version >= 5, flags */
ea16567f 4155 ceph_decode_32_safe(&p, end, flags, bad);
e1c9788c 4156 if (flags & CEPH_SESSION_BLOCKLISTED) {
38d46409
XL		 4157 pr_warn_client(cl, "mds%d session blocklisted\n",
4158 session->s_mds);
e1c9788c
KH		 4159 blocklisted = true;
4160 }
4161 }
4162
2f2dc053 4163 mutex_lock(&mdsc->mutex);
0a07fc8c 4164 if (op == CEPH_SESSION_CLOSE) {
5b3248c6 4165 ceph_get_mds_session(session);
2600d2dd 4166 __unregister_session(mdsc, session);
0a07fc8c 4167 }
2f2dc053
SW		 4168 /* FIXME: this ttl calculation is generous */
4169 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4170 mutex_unlock(&mdsc->mutex);
4171
4172 mutex_lock(&session->s_mutex);
4173
38d46409
XL		 4174 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4175 ceph_session_op_name(op), session,
4176 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 4177
4178 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4179 session->s_state = CEPH_MDS_SESSION_OPEN;
38d46409 4180 pr_info_client(cl, "mds%d came back\n", session->s_mds);
2f2dc053
SW		 4181 }
4182
4183 switch (op) {
4184 case CEPH_SESSION_OPEN:
29790f26 4185 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4186 pr_info_client(cl, "mds%d reconnect success\n",
4187 session->s_mds);
300e42a2 4188
f48e0342 4189 session->s_features = features;
300e42a2 4190 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
38d46409
XL		 4191 pr_notice_client(cl, "mds%d is already opened\n",
4192 session->s_mds);
300e42a2
XL		 4193 } else {
4194 session->s_state = CEPH_MDS_SESSION_OPEN;
300e42a2
XL		 4195 renewed_caps(mdsc, session, 0);
4196 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4197 &session->s_features))
4198 metric_schedule_delayed(&mdsc->metric);
4199 }
4200
4201 /*
4202 * The connection maybe broken and the session in client
4203 * side has been reinitialized, need to update the seq
4204 * anyway.
4205 */
4206 if (!session->s_seq && seq)
4207 session->s_seq = seq;
4208
2f2dc053
SW		 4209 wake = 1;
4210 if (mdsc->stopping)
4211 __close_session(mdsc, session);
4212 break;
4213
4214 case CEPH_SESSION_RENEWCAPS:
4215 if (session->s_renew_seq == seq)
4216 renewed_caps(mdsc, session, 1);
4217 break;
4218
4219 case CEPH_SESSION_CLOSE:
29790f26 4220 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4221 pr_info_client(cl, "mds%d reconnect denied\n",
4222 session->s_mds);
4d681c2f 4223 session->s_state = CEPH_MDS_SESSION_CLOSED;
1c841a96 4224 cleanup_session_requests(mdsc, session);
2f2dc053 4225 remove_session_caps(session);
656e4382 4226 wake = 2; /* for good measure */
f3c60c59 4227 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 4228 break;
4229
4230 case CEPH_SESSION_STALE:
38d46409
XL		 4231 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4232 session->s_mds);
52d60f8e 4233 atomic_inc(&session->s_cap_gen);
1ce208a6 4234 session->s_cap_ttl = jiffies - 1;
2f2dc053
SW		 4235 send_renew_caps(mdsc, session);
4236 break;
4237
4238 case CEPH_SESSION_RECALL_STATE:
e30ee581 4239 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 4240 break;
4241
186e4f7a 4242 case CEPH_SESSION_FLUSHMSG:
e7d84c6a
XL		 4243 /* flush cap releases */
4244 spin_lock(&session->s_cap_lock);
4245 if (session->s_num_cap_releases)
4246 ceph_flush_cap_releases(mdsc, session);
4247 spin_unlock(&session->s_cap_lock);
4248
186e4f7a
YZ		 4249 send_flushmsg_ack(mdsc, session, seq);
4250 break;
4251
03f4fcb0 4252 case CEPH_SESSION_FORCE_RO:
38d46409 4253 doutc(cl, "force_session_readonly %p\n", session);
03f4fcb0
YZ		 4254 spin_lock(&session->s_cap_lock);
4255 session->s_readonly = true;
4256 spin_unlock(&session->s_cap_lock);
d2f8bb27 4257 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 4258 break;
4259
fcff415c
YZ		 4260 case CEPH_SESSION_REJECT:
4261 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
38d46409
XL		 4262 pr_info_client(cl, "mds%d rejected session\n",
4263 session->s_mds);
fcff415c
YZ		 4264 session->s_state = CEPH_MDS_SESSION_REJECTED;
4265 cleanup_session_requests(mdsc, session);
4266 remove_session_caps(session);
0b98acd6
ID		 4267 if (blocklisted)
4268 mdsc->fsc->blocklisted = true;
fcff415c
YZ		 4269 wake = 2; /* for good measure */
4270 break;
4271
2f2dc053 4272 default:
38d46409 4273 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
2f2dc053
SW		 4274 WARN_ON(1);
4275 }
4276
4277 mutex_unlock(&session->s_mutex);
4278 if (wake) {
4279 mutex_lock(&mdsc->mutex);
4280 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 4281 if (wake == 2)
4282 kick_requests(mdsc, mds);
2f2dc053
SW		 4283 mutex_unlock(&mdsc->mutex);
4284 }
0a07fc8c
YZ		 4285 if (op == CEPH_SESSION_CLOSE)
4286 ceph_put_mds_session(session);
2f2dc053
SW		 4287 return;
4288
4289bad:
38d46409
XL		 4290 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4291 (int)msg->front.iov_len);
9ec7cab1 4292 ceph_msg_dump(msg);
2f2dc053
SW		 4293 return;
4294}
4295
a25949b9
JL		 4296void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4297{
38d46409 4298 struct ceph_client *cl = req->r_mdsc->fsc->client;
a25949b9
JL		 4299 int dcaps;
4300
4301 dcaps = xchg(&req->r_dir_caps, 0);
4302 if (dcaps) {
38d46409 4303 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
a25949b9
JL		 4304 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4305 }
4306}
4307
07045648 4308void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req)
e64f44a8 4309{
38d46409 4310 struct ceph_client *cl = req->r_mdsc->fsc->client;
e64f44a8
XL		 4311 int dcaps;
4312
4313 dcaps = xchg(&req->r_dir_caps, 0);
4314 if (dcaps) {
38d46409 4315 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
07045648 4316 ceph_put_cap_refs_async(ceph_inode(req->r_parent), dcaps);
e64f44a8
XL		 4317 }
4318}
4319
2f2dc053
SW		 4320/*
4321 * called under session->mutex.
4322 */
4323static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4324 struct ceph_mds_session *session)
4325{
4326 struct ceph_mds_request *req, *nreq;
3de22be6 4327 struct rb_node *p;
2f2dc053 4328
38d46409 4329 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
2f2dc053
SW		 4330
4331 mutex_lock(&mdsc->mutex);
9cf54563 4332 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
396bd62c 4333 __send_request(session, req, true);
3de22be6
YZ		 4334
4335 /*
4336 * also re-send old requests when MDS enters reconnect stage. So that MDS
4337 * can process completed request in clientreplay stage.
4338 */
4339 p = rb_first(&mdsc->request_tree);
4340 while (p) {
4341 req = rb_entry(p, struct ceph_mds_request, r_node);
4342 p = rb_next(p);
bc2de10d 4343 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 4344 continue;
4345 if (req->r_attempts == 0)
4346 continue; /* only old requests */
a25949b9
JL		 4347 if (!req->r_session)
4348 continue;
4349 if (req->r_session->s_mds != session->s_mds)
4350 continue;
4351
07045648 4352 ceph_mdsc_release_dir_caps_async(req);
a25949b9 4353
396bd62c 4354 __send_request(session, req, true);
3de22be6 4355 }
2f2dc053
SW		 4356 mutex_unlock(&mdsc->mutex);
4357}
4358
81c5a148
YZ		 4359static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4360{
4361 struct ceph_msg *reply;
4362 struct ceph_pagelist *_pagelist;
4363 struct page *page;
4364 __le32 *addr;
4365 int err = -ENOMEM;
4366
4367 if (!recon_state->allow_multi)
4368 return -ENOSPC;
4369
4370 /* can't handle message that contains both caps and realm */
4371 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4372
4373 /* pre-allocate new pagelist */
4374 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4375 if (!_pagelist)
4376 return -ENOMEM;
4377
4378 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4379 if (!reply)
4380 goto fail_msg;
4381
4382 /* placeholder for nr_caps */
4383 err = ceph_pagelist_encode_32(_pagelist, 0);
4384 if (err < 0)
4385 goto fail;
4386
4387 if (recon_state->nr_caps) {
4388 /* currently encoding caps */
4389 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4390 if (err)
4391 goto fail;
4392 } else {
4393 /* placeholder for nr_realms (currently encoding relams) */
4394 err = ceph_pagelist_encode_32(_pagelist, 0);
4395 if (err < 0)
4396 goto fail;
4397 }
4398
4399 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4400 if (err)
4401 goto fail;
4402
4403 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4404 addr = kmap_atomic(page);
4405 if (recon_state->nr_caps) {
4406 /* currently encoding caps */
4407 *addr = cpu_to_le32(recon_state->nr_caps);
4408 } else {
4409 /* currently encoding relams */
4410 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4411 }
4412 kunmap_atomic(addr);
4413
4414 reply->hdr.version = cpu_to_le16(5);
4415 reply->hdr.compat_version = cpu_to_le16(4);
4416
4417 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4418 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4419
4420 ceph_con_send(&recon_state->session->s_con, reply);
4421 ceph_pagelist_release(recon_state->pagelist);
4422
4423 recon_state->pagelist = _pagelist;
4424 recon_state->nr_caps = 0;
4425 recon_state->nr_realms = 0;
4426 recon_state->msg_version = 5;
4427 return 0;
4428fail:
4429 ceph_msg_put(reply);
4430fail_msg:
4431 ceph_pagelist_release(_pagelist);
4432 return err;
4433}
4434
a33f6432
YZ		 4435static struct dentry* d_find_primary(struct inode *inode)
4436{
4437 struct dentry *alias, *dn = NULL;
4438
4439 if (hlist_empty(&inode->i_dentry))
4440 return NULL;
4441
4442 spin_lock(&inode->i_lock);
4443 if (hlist_empty(&inode->i_dentry))
4444 goto out_unlock;
4445
4446 if (S_ISDIR(inode->i_mode)) {
4447 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4448 if (!IS_ROOT(alias))
4449 dn = dget(alias);
4450 goto out_unlock;
4451 }
4452
4453 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4454 spin_lock(&alias->d_lock);
4455 if (!d_unhashed(alias) &&
4456 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4457 dn = dget_dlock(alias);
4458 }
4459 spin_unlock(&alias->d_lock);
4460 if (dn)
4461 break;
4462 }
4463out_unlock:
4464 spin_unlock(&inode->i_lock);
4465 return dn;
4466}
4467
2f2dc053
SW		 4468/*
4469 * Encode information about a cap for a reconnect with the MDS.
4470 */
aaf67de7 4471static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 4472{
197b7d79 4473 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 4474 struct ceph_client *cl = ceph_inode_to_client(inode);
20cb34ae
SW		 4475 union {
4476 struct ceph_mds_cap_reconnect v2;
4477 struct ceph_mds_cap_reconnect_v1 v1;
4478 } rec;
aaf67de7 4479 struct ceph_inode_info *ci = ceph_inode(inode);
20cb34ae
SW		 4480 struct ceph_reconnect_state *recon_state = arg;
4481 struct ceph_pagelist *pagelist = recon_state->pagelist;
a33f6432 4482 struct dentry *dentry;
aaf67de7 4483 struct ceph_cap *cap;
a33f6432 4484 char *path;
9aaa7eb0 4485 int pathlen = 0, err;
a33f6432 4486 u64 pathbase;
3469ed0d 4487 u64 snap_follows;
2f2dc053 4488
a33f6432
YZ		 4489 dentry = d_find_primary(inode);
4490 if (dentry) {
4491 /* set pathbase to parent dir when msg_version >= 2 */
197b7d79 4492 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
a33f6432
YZ		 4493 recon_state->msg_version >= 2);
4494 dput(dentry);
4495 if (IS_ERR(path)) {
4496 err = PTR_ERR(path);
4497 goto out_err;
4498 }
4499 } else {
4500 path = NULL;
a33f6432
YZ		 4501 pathbase = 0;
4502 }
4503
be655596 4504 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 4505 cap = __get_cap_for_mds(ci, mds);
4506 if (!cap) {
4507 spin_unlock(&ci->i_ceph_lock);
9aaa7eb0 4508 err = 0;
aaf67de7
XL		 4509 goto out_err;
4510 }
38d46409
XL		 4511 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4512 ceph_vinop(inode), cap, cap->cap_id,
4513 ceph_cap_string(cap->issued));
aaf67de7 4514
2f2dc053
SW		 4515 cap->seq = 0; /* reset cap seq */
4516 cap->issue_seq = 0; /* and issue_seq */
667ca05c 4517 cap->mseq = 0; /* and migrate_seq */
52d60f8e 4518 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
20cb34ae 4519
a25949b9 4520 /* These are lost when the session goes away */
785892fe
JL		 4521 if (S_ISDIR(inode->i_mode)) {
4522 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4523 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4524 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4525 }
a25949b9 4526 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
785892fe 4527 }
a25949b9 4528
121f22a1 4529 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 4530 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4531 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4532 rec.v2.issued = cpu_to_le32(cap->issued);
4533 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4534 rec.v2.pathbase = cpu_to_le64(pathbase);
ec1dff25
JL		 4535 rec.v2.flock_len = (__force __le32)
4536 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae 4537 } else {
c453bdb5
JL		 4538 struct timespec64 ts;
4539
20cb34ae
SW		 4540 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4541 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4542 rec.v1.issued = cpu_to_le32(cap->issued);
2d6795fb 4543 rec.v1.size = cpu_to_le64(i_size_read(inode));
c453bdb5
JL		 4544 ts = inode_get_mtime(inode);
4545 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4546 ts = inode_get_atime(inode);
4547 ceph_encode_timespec64(&rec.v1.atime, &ts);
20cb34ae 4548 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4549 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 4550 }
3469ed0d
YZ		 4551
4552 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 4553 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 4554 } else {
4555 struct ceph_cap_snap *capsnap =
4556 list_first_entry(&ci->i_cap_snaps,
4557 struct ceph_cap_snap, ci_item);
4558 snap_follows = capsnap->follows;
20cb34ae 4559 }
be655596 4560 spin_unlock(&ci->i_ceph_lock);
2f2dc053 4561
121f22a1 4562 if (recon_state->msg_version >= 2) {
40819f6f 4563 int num_fcntl_locks, num_flock_locks;
4deb14a2 4564 struct ceph_filelock *flocks = NULL;
81c5a148 4565 size_t struct_len, total_len = sizeof(u64);
121f22a1 4566 u8 struct_v = 0;
39be95e9
JS		 4567
4568encode_again:
b3f8d68f
YZ		 4569 if (rec.v2.flock_len) {
4570 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4571 } else {
4572 num_fcntl_locks = 0;
4573 num_flock_locks = 0;
4574 }
4deb14a2 4575 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 4576 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4577 sizeof(struct ceph_filelock),
4578 GFP_NOFS);
4deb14a2
YZ		 4579 if (!flocks) {
4580 err = -ENOMEM;
5ccedf1c 4581 goto out_err;
4deb14a2
YZ		 4582 }
4583 err = ceph_encode_locks_to_buffer(inode, flocks,
4584 num_fcntl_locks,
4585 num_flock_locks);
4586 if (err) {
4587 kfree(flocks);
4588 flocks = NULL;
4589 if (err == -ENOSPC)
4590 goto encode_again;
5ccedf1c 4591 goto out_err;
4deb14a2
YZ		 4592 }
4593 } else {
39be95e9 4594 kfree(flocks);
4deb14a2 4595 flocks = NULL;
39be95e9 4596 }
121f22a1
YZ		 4597
4598 if (recon_state->msg_version >= 3) {
4599 /* version, compat_version and struct_len */
81c5a148 4600 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 4601 struct_v = 2;
121f22a1 4602 }
39be95e9
JS		 4603 /*
4604 * number of encoded locks is stable, so copy to pagelist
4605 */
121f22a1
YZ		 4606 struct_len = 2 * sizeof(u32) +
4607 (num_fcntl_locks + num_flock_locks) *
4608 sizeof(struct ceph_filelock);
4609 rec.v2.flock_len = cpu_to_le32(struct_len);
4610
a33f6432 4611 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
121f22a1 4612
3469ed0d
YZ		 4613 if (struct_v >= 2)
4614 struct_len += sizeof(u64); /* snap_follows */
4615
121f22a1 4616 total_len += struct_len;
81c5a148
YZ		 4617
4618 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4619 err = send_reconnect_partial(recon_state);
4620 if (err)
4621 goto out_freeflocks;
4622 pagelist = recon_state->pagelist;
5ccedf1c 4623 }
121f22a1 4624
81c5a148
YZ		 4625 err = ceph_pagelist_reserve(pagelist, total_len);
4626 if (err)
4627 goto out_freeflocks;
4628
4629 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4630 if (recon_state->msg_version >= 3) {
4631 ceph_pagelist_encode_8(pagelist, struct_v);
4632 ceph_pagelist_encode_8(pagelist, 1);
4633 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 4634 }
a33f6432 4635 ceph_pagelist_encode_string(pagelist, path, pathlen);
5ccedf1c
YZ		 4636 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4637 ceph_locks_to_pagelist(flocks, pagelist,
4638 num_fcntl_locks, num_flock_locks);
4639 if (struct_v >= 2)
4640 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 4641out_freeflocks:
39be95e9 4642 kfree(flocks);
3612abbd 4643 } else {
5ccedf1c 4644 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 4645 sizeof(u64) + sizeof(u32) +
4646 pathlen + sizeof(rec.v1));
a33f6432
YZ		 4647 if (err)
4648 goto out_err;
5ccedf1c 4649
81c5a148 4650 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4651 ceph_pagelist_encode_string(pagelist, path, pathlen);
4652 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
40819f6f 4653 }
44c99757 4654
5ccedf1c 4655out_err:
a33f6432
YZ		 4656 ceph_mdsc_free_path(path, pathlen);
4657 if (!err)
81c5a148
YZ		 4658 recon_state->nr_caps++;
4659 return err;
4660}
4661
4662static int encode_snap_realms(struct ceph_mds_client *mdsc,
4663 struct ceph_reconnect_state *recon_state)
4664{
4665 struct rb_node *p;
4666 struct ceph_pagelist *pagelist = recon_state->pagelist;
38d46409 4667 struct ceph_client *cl = mdsc->fsc->client;
81c5a148
YZ		 4668 int err = 0;
4669
4670 if (recon_state->msg_version >= 4) {
4671 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4672 if (err < 0)
4673 goto fail;
4674 }
4675
4676 /*
4677 * snaprealms. we provide mds with the ino, seq (version), and
4678 * parent for all of our realms. If the mds has any newer info,
4679 * it will tell us.
4680 */
4681 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4682 struct ceph_snap_realm *realm =
4683 rb_entry(p, struct ceph_snap_realm, node);
4684 struct ceph_mds_snaprealm_reconnect sr_rec;
4685
4686 if (recon_state->msg_version >= 4) {
4687 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4688 sizeof(sr_rec);
4689
4690 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4691 err = send_reconnect_partial(recon_state);
4692 if (err)
4693 goto fail;
4694 pagelist = recon_state->pagelist;
4695 }
4696
4697 err = ceph_pagelist_reserve(pagelist, need);
4698 if (err)
4699 goto fail;
4700
4701 ceph_pagelist_encode_8(pagelist, 1);
4702 ceph_pagelist_encode_8(pagelist, 1);
4703 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4704 }
4705
38d46409
XL		 4706 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4707 realm->ino, realm->seq, realm->parent_ino);
81c5a148
YZ		 4708 sr_rec.ino = cpu_to_le64(realm->ino);
4709 sr_rec.seq = cpu_to_le64(realm->seq);
4710 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4711
4712 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4713 if (err)
4714 goto fail;
4715
4716 recon_state->nr_realms++;
4717 }
4718fail:
93cea5be 4719 return err;
2f2dc053
SW		 4720}
4721
4722
4723/*
4724 * If an MDS fails and recovers, clients need to reconnect in order to
4725 * reestablish shared state. This includes all caps issued through
4726 * this session _and_ the snap_realm hierarchy. Because it's not
4727 * clear which snap realms the mds cares about, we send everything we
4728 * know about.. that ensures we'll then get any new info the
4729 * recovering MDS might have.
4730 *
4731 * This is a relatively heavyweight operation, but it's rare.
2f2dc053 4732 */
34b6c855
SW		 4733static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4734 struct ceph_mds_session *session)
2f2dc053 4735{
38d46409 4736 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4737 struct ceph_msg *reply;
34b6c855 4738 int mds = session->s_mds;
9abf82b8 4739 int err = -ENOMEM;
81c5a148
YZ		 4740 struct ceph_reconnect_state recon_state = {
4741 .session = session,
4742 };
c8a96a31 4743 LIST_HEAD(dispose);
2f2dc053 4744
38d46409 4745 pr_info_client(cl, "mds%d reconnect start\n", mds);
2f2dc053 4746
81c5a148
YZ		 4747 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4748 if (!recon_state.pagelist)
93cea5be 4749 goto fail_nopagelist;
93cea5be 4750
0d9c1ab3 4751 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 4752 if (!reply)
93cea5be 4753 goto fail_nomsg;
93cea5be 4754
d4846487
JL		 4755 xa_destroy(&session->s_delegated_inos);
4756
34b6c855
SW		 4757 mutex_lock(&session->s_mutex);
4758 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4759 session->s_seq = 0;
2f2dc053 4760
38d46409
XL		 4761 doutc(cl, "session %p state %s\n", session,
4762 ceph_session_state_name(session->s_state));
2f2dc053 4763
52d60f8e 4764 atomic_inc(&session->s_cap_gen);
99a9c273
YZ		 4765
4766 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 4767 /* don't know if session is readonly */
4768 session->s_readonly = 0;
99a9c273
YZ		 4769 /*
4770 * notify __ceph_remove_cap() that we are composing cap reconnect.
4771 * If a cap get released before being added to the cap reconnect,
4772 * __ceph_remove_cap() should skip queuing cap release.
4773 */
4774 session->s_cap_reconnect = 1;
e01a5946 4775 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 4776 detach_cap_releases(session, &dispose);
4777 spin_unlock(&session->s_cap_lock);
4778 dispose_cap_releases(mdsc, &dispose);
e01a5946 4779
5d23371f 4780 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 4781 if (mdsc->fsc->sb->s_root)
4782 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 4783
4784 ceph_con_close(&session->s_con);
4785 ceph_con_open(&session->s_con,
4786 CEPH_ENTITY_TYPE_MDS, mds,
4787 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4788
4789 /* replay unsafe requests */
4790 replay_unsafe_requests(mdsc, session);
4791
81c5a148
YZ		 4792 ceph_early_kick_flushing_caps(mdsc, session);
4793
5d23371f
YZ		 4794 down_read(&mdsc->snap_rwsem);
4795
81c5a148
YZ		 4796 /* placeholder for nr_caps */
4797 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 4798 if (err)
4799 goto fail;
20cb34ae 4800
81c5a148 4801 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 4802 recon_state.msg_version = 3;
81c5a148
YZ		 4803 recon_state.allow_multi = true;
4804 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4805 recon_state.msg_version = 3;
4806 } else {
23c625ce 4807 recon_state.msg_version = 2;
81c5a148
YZ		 4808 }
4809 /* trsaverse this session's caps */
a25949b9 4810 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
2f2dc053 4811
99a9c273
YZ		 4812 spin_lock(&session->s_cap_lock);
4813 session->s_cap_reconnect = 0;
4814 spin_unlock(&session->s_cap_lock);
4815
81c5a148
YZ		 4816 if (err < 0)
4817 goto fail;
2f2dc053 4818
81c5a148
YZ		 4819 /* check if all realms can be encoded into current message */
4820 if (mdsc->num_snap_realms) {
4821 size_t total_len =
4822 recon_state.pagelist->length +
4823 mdsc->num_snap_realms *
4824 sizeof(struct ceph_mds_snaprealm_reconnect);
4825 if (recon_state.msg_version >= 4) {
4826 /* number of realms */
4827 total_len += sizeof(u32);
4828 /* version, compat_version and struct_len */
4829 total_len += mdsc->num_snap_realms *
4830 (2 * sizeof(u8) + sizeof(u32));
4831 }
4832 if (total_len > RECONNECT_MAX_SIZE) {
4833 if (!recon_state.allow_multi) {
4834 err = -ENOSPC;
4835 goto fail;
4836 }
4837 if (recon_state.nr_caps) {
4838 err = send_reconnect_partial(&recon_state);
4839 if (err)
4840 goto fail;
4841 }
4842 recon_state.msg_version = 5;
4843 }
2f2dc053 4844 }
2f2dc053 4845
81c5a148
YZ		 4846 err = encode_snap_realms(mdsc, &recon_state);
4847 if (err < 0)
4848 goto fail;
4849
4850 if (recon_state.msg_version >= 5) {
4851 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4852 if (err < 0)
4853 goto fail;
4854 }
44c99757 4855
81c5a148
YZ		 4856 if (recon_state.nr_caps || recon_state.nr_realms) {
4857 struct page *page =
4858 list_first_entry(&recon_state.pagelist->head,
4859 struct page, lru);
44c99757 4860 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 4861 if (recon_state.nr_caps) {
4862 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4863 *addr = cpu_to_le32(recon_state.nr_caps);
4864 } else if (recon_state.msg_version >= 4) {
4865 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4866 }
44c99757 4867 kunmap_atomic(addr);
ebf18f47 4868 }
44c99757 4869
81c5a148
YZ		 4870 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4871 if (recon_state.msg_version >= 4)
4872 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 4873
81c5a148
YZ		 4874 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4875 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 4876
2f2dc053
SW		 4877 ceph_con_send(&session->s_con, reply);
4878
9abf82b8
SW		 4879 mutex_unlock(&session->s_mutex);
4880
4881 mutex_lock(&mdsc->mutex);
4882 __wake_requests(mdsc, &session->s_waiting);
4883 mutex_unlock(&mdsc->mutex);
4884
2f2dc053 4885 up_read(&mdsc->snap_rwsem);
81c5a148 4886 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 4887 return;
4888
93cea5be 4889fail:
2f2dc053 4890 ceph_msg_put(reply);
9abf82b8
SW		 4891 up_read(&mdsc->snap_rwsem);
4892 mutex_unlock(&session->s_mutex);
93cea5be 4893fail_nomsg:
81c5a148 4894 ceph_pagelist_release(recon_state.pagelist);
93cea5be 4895fail_nopagelist:
38d46409
XL		 4896 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
4897 err, mds);
9abf82b8 4898 return;
2f2dc053
SW		 4899}
4900
4901
4902/*
4903 * compare old and new mdsmaps, kicking requests
4904 * and closing out old connections as necessary
4905 *
4906 * called under mdsc->mutex.
4907 */
4908static void check_new_map(struct ceph_mds_client *mdsc,
4909 struct ceph_mdsmap *newmap,
4910 struct ceph_mdsmap *oldmap)
4911{
d517b398 4912 int i, j, err;
2f2dc053
SW		 4913 int oldstate, newstate;
4914 struct ceph_mds_session *s;
d517b398 4915 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
38d46409 4916 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4917
38d46409 4918 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
2f2dc053 4919
d517b398
XL		 4920 if (newmap->m_info) {
4921 for (i = 0; i < newmap->possible_max_rank; i++) {
4922 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4923 set_bit(newmap->m_info[i].export_targets[j], targets);
4924 }
4925 }
4926
b38c9eb4 4927 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
d37b1d99 4928 if (!mdsc->sessions[i])
2f2dc053
SW		 4929 continue;
4930 s = mdsc->sessions[i];
4931 oldstate = ceph_mdsmap_get_state(oldmap, i);
4932 newstate = ceph_mdsmap_get_state(newmap, i);
4933
38d46409
XL		 4934 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
4935 i, ceph_mds_state_name(oldstate),
4936 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4937 ceph_mds_state_name(newstate),
4938 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4939 ceph_session_state_name(s->s_state));
2f2dc053 4940
b38c9eb4 4941 if (i >= newmap->possible_max_rank) {
6f0f597b 4942 /* force close session for stopped mds */
5b3248c6 4943 ceph_get_mds_session(s);
6f0f597b
YZ		 4944 __unregister_session(mdsc, s);
4945 __wake_requests(mdsc, &s->s_waiting);
4946 mutex_unlock(&mdsc->mutex);
2827528d 4947
6f0f597b
YZ		 4948 mutex_lock(&s->s_mutex);
4949 cleanup_session_requests(mdsc, s);
4950 remove_session_caps(s);
4951 mutex_unlock(&s->s_mutex);
2827528d 4952
6f0f597b 4953 ceph_put_mds_session(s);
2827528d 4954
6f0f597b
YZ		 4955 mutex_lock(&mdsc->mutex);
4956 kick_requests(mdsc, i);
4957 continue;
4958 }
4959
4960 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4961 ceph_mdsmap_get_addr(newmap, i),
4962 sizeof(struct ceph_entity_addr))) {
4963 /* just close it */
4964 mutex_unlock(&mdsc->mutex);
4965 mutex_lock(&s->s_mutex);
4966 mutex_lock(&mdsc->mutex);
4967 ceph_con_close(&s->s_con);
4968 mutex_unlock(&s->s_mutex);
4969 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 4970 } else if (oldstate == newstate) {
4971 continue; /* nothing new with this mds */
4972 }
4973
4974 /*
4975 * send reconnect?
4976 */
4977 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 4978 newstate >= CEPH_MDS_STATE_RECONNECT) {
4979 mutex_unlock(&mdsc->mutex);
d517b398 4980 clear_bit(i, targets);
34b6c855
SW		 4981 send_mds_reconnect(mdsc, s);
4982 mutex_lock(&mdsc->mutex);
4983 }
2f2dc053
SW		 4984
4985 /*
29790f26 4986 * kick request on any mds that has gone active.
2f2dc053
SW		 4987 */
4988 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4989 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 4990 if (oldstate != CEPH_MDS_STATE_CREATING &&
4991 oldstate != CEPH_MDS_STATE_STARTING)
38d46409
XL		 4992 pr_info_client(cl, "mds%d recovery completed\n",
4993 s->s_mds);
29790f26 4994 kick_requests(mdsc, i);
ea8412b2 4995 mutex_unlock(&mdsc->mutex);
829ad4db 4996 mutex_lock(&s->s_mutex);
ea8412b2 4997 mutex_lock(&mdsc->mutex);
2f2dc053 4998 ceph_kick_flushing_caps(mdsc, s);
829ad4db 4999 mutex_unlock(&s->s_mutex);
d2f8bb27 5000 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 5001 }
5002 }
cb170a22 5003
d517b398
XL		 5004 /*
5005 * Only open and reconnect sessions that don't exist yet.
5006 */
5007 for (i = 0; i < newmap->possible_max_rank; i++) {
5008 /*
5009 * In case the import MDS is crashed just after
5010 * the EImportStart journal is flushed, so when
5011 * a standby MDS takes over it and is replaying
5012 * the EImportStart journal the new MDS daemon
5013 * will wait the client to reconnect it, but the
5014 * client may never register/open the session yet.
5015 *
5016 * Will try to reconnect that MDS daemon if the
5017 * rank number is in the export targets array and
5018 * is the up:reconnect state.
5019 */
5020 newstate = ceph_mdsmap_get_state(newmap, i);
5021 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
5022 continue;
5023
5024 /*
5025 * The session maybe registered and opened by some
5026 * requests which were choosing random MDSes during
5027 * the mdsc->mutex's unlock/lock gap below in rare
5028 * case. But the related MDS daemon will just queue
5029 * that requests and be still waiting for the client's
5030 * reconnection request in up:reconnect state.
5031 */
5032 s = __ceph_lookup_mds_session(mdsc, i);
5033 if (likely(!s)) {
5034 s = __open_export_target_session(mdsc, i);
5035 if (IS_ERR(s)) {
5036 err = PTR_ERR(s);
38d46409
XL		 5037 pr_err_client(cl,
5038 "failed to open export target session, err %d\n",
5039 err);
d517b398
XL		 5040 continue;
5041 }
5042 }
38d46409 5043 doutc(cl, "send reconnect to export target mds.%d\n", i);
d517b398
XL		 5044 mutex_unlock(&mdsc->mutex);
5045 send_mds_reconnect(mdsc, s);
5046 ceph_put_mds_session(s);
5047 mutex_lock(&mdsc->mutex);
5048 }
5049
b38c9eb4 5050 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
cb170a22
SW		 5051 s = mdsc->sessions[i];
5052 if (!s)
5053 continue;
5054 if (!ceph_mdsmap_is_laggy(newmap, i))
5055 continue;
5056 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5057 s->s_state == CEPH_MDS_SESSION_HUNG ||
5058 s->s_state == CEPH_MDS_SESSION_CLOSING) {
38d46409 5059 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
cb170a22
SW		 5060 __open_export_target_sessions(mdsc, s);
5061 }
5062 }
2f2dc053
SW		 5063}
5064
5065
5066
5067/*
5068 * leases
5069 */
5070
5071/*
5072 * caller must hold session s_mutex, dentry->d_lock
5073 */
5074void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5075{
5076 struct ceph_dentry_info *di = ceph_dentry(dentry);
5077
5078 ceph_put_mds_session(di->lease_session);
5079 di->lease_session = NULL;
5080}
5081
2600d2dd
SW		 5082static void handle_lease(struct ceph_mds_client *mdsc,
5083 struct ceph_mds_session *session,
5084 struct ceph_msg *msg)
2f2dc053 5085{
38d46409 5086 struct ceph_client *cl = mdsc->fsc->client;
3d14c5d2 5087 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 5088 struct inode *inode;
2f2dc053
SW		 5089 struct dentry *parent, *dentry;
5090 struct ceph_dentry_info *di;
2600d2dd 5091 int mds = session->s_mds;
2f2dc053 5092 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 5093 u32 seq;
2f2dc053 5094 struct ceph_vino vino;
2f2dc053
SW		 5095 struct qstr dname;
5096 int release = 0;
5097
38d46409 5098 doutc(cl, "from mds%d\n", mds);
2f2dc053 5099
e3dfcab2
XL		 5100 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5101 return;
5102
2f2dc053
SW		 5103 /* decode */
5104 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5105 goto bad;
5106 vino.ino = le64_to_cpu(h->ino);
5107 vino.snap = CEPH_NOSNAP;
1e5ea23d 5108 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 5109 dname.len = get_unaligned_le32(h + 1);
5110 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 5111 goto bad;
0fcf6c02 5112 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 5113
2f2dc053
SW		 5114 /* lookup inode */
5115 inode = ceph_find_inode(sb, vino);
38d46409
XL		 5116 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5117 vino.ino, inode, dname.len, dname.name);
6cd3bcad
YZ		 5118
5119 mutex_lock(&session->s_mutex);
d37b1d99 5120 if (!inode) {
38d46409 5121 doutc(cl, "no inode %llx\n", vino.ino);
2f2dc053
SW		 5122 goto release;
5123 }
2f2dc053
SW		 5124
5125 /* dentry */
5126 parent = d_find_alias(inode);
5127 if (!parent) {
38d46409 5128 doutc(cl, "no parent dentry on inode %p\n", inode);
2f2dc053
SW		 5129 WARN_ON(1);
5130 goto release; /* hrm... */
5131 }
8387ff25 5132 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 5133 dentry = d_lookup(parent, &dname);
5134 dput(parent);
5135 if (!dentry)
5136 goto release;
5137
5138 spin_lock(&dentry->d_lock);
5139 di = ceph_dentry(dentry);
5140 switch (h->action) {
5141 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 5142 if (di->lease_session == session) {
1e5ea23d
SW		 5143 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5144 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 5145 __ceph_mdsc_drop_dentry_lease(dentry);
5146 }
5147 release = 1;
5148 break;
5149
5150 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 5151 if (di->lease_session == session &&
52d60f8e 5152 di->lease_gen == atomic_read(&session->s_cap_gen) &&
2f2dc053
SW		 5153 di->lease_renew_from &&
5154 di->lease_renew_after == 0) {
5155 unsigned long duration =
3563dbdd 5156 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 5157
1e5ea23d 5158 di->lease_seq = seq;
9b16f03c 5159 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 5160 di->lease_renew_after = di->lease_renew_from +
5161 (duration >> 1);
5162 di->lease_renew_from = 0;
5163 }
5164 break;
5165 }
5166 spin_unlock(&dentry->d_lock);
5167 dput(dentry);
5168
5169 if (!release)
5170 goto out;
5171
5172release:
5173 /* let's just reuse the same message */
5174 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5175 ceph_msg_get(msg);
5176 ceph_con_send(&session->s_con, msg);
5177
5178out:
2f2dc053 5179 mutex_unlock(&session->s_mutex);
23c2c76e 5180 iput(inode);
e3dfcab2
XL		 5181
5182 ceph_dec_mds_stopping_blocker(mdsc);
2f2dc053
SW		 5183 return;
5184
5185bad:
e3dfcab2
XL		 5186 ceph_dec_mds_stopping_blocker(mdsc);
5187
38d46409 5188 pr_err_client(cl, "corrupt lease message\n");
9ec7cab1 5189 ceph_msg_dump(msg);
2f2dc053
SW		 5190}
5191
5192void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 5193 struct dentry *dentry, char action,
5194 u32 seq)
5195{
38d46409 5196 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053
SW		 5197 struct ceph_msg *msg;
5198 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 5199 struct inode *dir;
5200 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 5201
38d46409
XL		 5202 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5203 session->s_mds);
2f2dc053 5204
b61c2763 5205 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 5206 if (!msg)
2f2dc053
SW		 5207 return;
5208 lease = msg->front.iov_base;
5209 lease->action = action;
2f2dc053 5210 lease->seq = cpu_to_le32(seq);
2f2dc053 5211
8f2a98ef
YZ		 5212 spin_lock(&dentry->d_lock);
5213 dir = d_inode(dentry->d_parent);
5214 lease->ino = cpu_to_le64(ceph_ino(dir));
5215 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5216
5217 put_unaligned_le32(dentry->d_name.len, lease + 1);
5218 memcpy((void *)(lease + 1) + 4,
5219 dentry->d_name.name, dentry->d_name.len);
5220 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 5221
5222 ceph_con_send(&session->s_con, msg);
5223}
5224
2f2dc053 5225/*
59b312f3 5226 * lock unlock the session, to wait ongoing session activities
2f2dc053 5227 */
59b312f3 5228static void lock_unlock_session(struct ceph_mds_session *s)
2f2dc053 5229{
59b312f3
XL		 5230 mutex_lock(&s->s_mutex);
5231 mutex_unlock(&s->s_mutex);
2f2dc053
SW		 5232}
5233
131d7eb4
YZ		 5234static void maybe_recover_session(struct ceph_mds_client *mdsc)
5235{
38d46409 5236 struct ceph_client *cl = mdsc->fsc->client;
131d7eb4
YZ		 5237 struct ceph_fs_client *fsc = mdsc->fsc;
5238
5239 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5240 return;
2f2dc053 5241
131d7eb4
YZ		 5242 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5243 return;
5244
0b98acd6 5245 if (!READ_ONCE(fsc->blocklisted))
131d7eb4
YZ		 5246 return;
5247
38d46409 5248 pr_info_client(cl, "auto reconnect after blocklisted\n");
131d7eb4
YZ		 5249 ceph_force_reconnect(fsc->sb);
5250}
2f2dc053 5251
3e699bd8
XL		 5252bool check_session_state(struct ceph_mds_session *s)
5253{
38d46409
XL		 5254 struct ceph_client *cl = s->s_mdsc->fsc->client;
5255
62575e27
JL		 5256 switch (s->s_state) {
5257 case CEPH_MDS_SESSION_OPEN:
5258 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3e699bd8 5259 s->s_state = CEPH_MDS_SESSION_HUNG;
38d46409 5260 pr_info_client(cl, "mds%d hung\n", s->s_mds);
3e699bd8 5261 }
62575e27
JL		 5262 break;
5263 case CEPH_MDS_SESSION_CLOSING:
62575e27
JL		 5264 case CEPH_MDS_SESSION_NEW:
5265 case CEPH_MDS_SESSION_RESTARTING:
5266 case CEPH_MDS_SESSION_CLOSED:
5267 case CEPH_MDS_SESSION_REJECTED:
3e699bd8 5268 return false;
62575e27 5269 }
3e699bd8
XL		 5270
5271 return true;
5272}
5273
62575e27
JL		 5274/*
5275 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5276 * then we need to retransmit that request.
5277 */
5278void inc_session_sequence(struct ceph_mds_session *s)
5279{
38d46409
XL		 5280 struct ceph_client *cl = s->s_mdsc->fsc->client;
5281
62575e27
JL		 5282 lockdep_assert_held(&s->s_mutex);
5283
5284 s->s_seq++;
5285
5286 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5287 int ret;
5288
38d46409 5289 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
62575e27
JL		 5290 ret = request_close_session(s);
5291 if (ret < 0)
38d46409
XL		 5292 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5293 s->s_mds, ret);
62575e27
JL		 5294 }
5295}
5296
2f2dc053 5297/*
bf2ba432
LH		 5298 * delayed work -- periodically trim expired leases, renew caps with mds. If
5299 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5300 * workqueue delay value of 5 secs will be used.
2f2dc053 5301 */
bf2ba432 5302static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
2f2dc053 5303{
bf2ba432
LH		 5304 unsigned long max_delay = HZ * 5;
5305
5306 /* 5 secs default delay */
5307 if (!delay || (delay > max_delay))
5308 delay = max_delay;
5309 schedule_delayed_work(&mdsc->delayed_work,
5310 round_jiffies_relative(delay));
2f2dc053
SW		 5311}
5312
5313static void delayed_work(struct work_struct *work)
5314{
2f2dc053
SW		 5315 struct ceph_mds_client *mdsc =
5316 container_of(work, struct ceph_mds_client, delayed_work.work);
bf2ba432 5317 unsigned long delay;
2f2dc053
SW		 5318 int renew_interval;
5319 int renew_caps;
bf2ba432 5320 int i;
2f2dc053 5321
38d46409 5322 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
75c9627e 5323
e7e607bd 5324 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
fa996773
XL		 5325 return;
5326
2f2dc053
SW		 5327 mutex_lock(&mdsc->mutex);
5328 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5329 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5330 mdsc->last_renew_caps);
5331 if (renew_caps)
5332 mdsc->last_renew_caps = jiffies;
5333
5334 for (i = 0; i < mdsc->max_sessions; i++) {
5335 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 5336 if (!s)
2f2dc053 5337 continue;
3e699bd8
XL		 5338
5339 if (!check_session_state(s)) {
2f2dc053
SW		 5340 ceph_put_mds_session(s);
5341 continue;
5342 }
5343 mutex_unlock(&mdsc->mutex);
5344
5345 mutex_lock(&s->s_mutex);
5346 if (renew_caps)
5347 send_renew_caps(mdsc, s);
5348 else
5349 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 5350 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5351 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 5352 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 5353 mutex_unlock(&s->s_mutex);
5354 ceph_put_mds_session(s);
5355
5356 mutex_lock(&mdsc->mutex);
5357 }
5358 mutex_unlock(&mdsc->mutex);
5359
bf2ba432 5360 delay = ceph_check_delayed_caps(mdsc);
37c4efc1
YZ		 5361
5362 ceph_queue_cap_reclaim_work(mdsc);
5363
5364 ceph_trim_snapid_map(mdsc);
5365
131d7eb4
YZ		 5366 maybe_recover_session(mdsc);
5367
bf2ba432 5368 schedule_delayed(mdsc, delay);
2f2dc053
SW		 5369}
5370
3d14c5d2 5371int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 5372
2f2dc053 5373{
3d14c5d2 5374 struct ceph_mds_client *mdsc;
f9009efa 5375 int err;
3d14c5d2
YS		 5376
5377 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5378 if (!mdsc)
5379 return -ENOMEM;
5380 mdsc->fsc = fsc;
2f2dc053
SW		 5381 mutex_init(&mdsc->mutex);
5382 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 5383 if (!mdsc->mdsmap) {
f9009efa
XL		 5384 err = -ENOMEM;
5385 goto err_mdsc;
fb3101b6 5386 }
2d06eeb8 5387
2f2dc053 5388 init_completion(&mdsc->safe_umount_waiters);
e3dfcab2
XL		 5389 spin_lock_init(&mdsc->stopping_lock);
5390 atomic_set(&mdsc->stopping_blockers, 0);
5391 init_completion(&mdsc->stopping_waiter);
f3c60c59 5392 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053 5393 INIT_LIST_HEAD(&mdsc->waiting_for_map);
0c44a8e0
LH		 5394 mdsc->quotarealms_inodes = RB_ROOT;
5395 mutex_init(&mdsc->quotarealms_inodes_mutex);
2f2dc053 5396 init_rwsem(&mdsc->snap_rwsem);
a105f00c 5397 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 5398 INIT_LIST_HEAD(&mdsc->snap_empty);
5399 spin_lock_init(&mdsc->snap_empty_lock);
44ca18f2 5400 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 5401 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5402 mdsc->last_renew_caps = jiffies;
5403 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3a3430af 5404 INIT_LIST_HEAD(&mdsc->cap_wait_list);
2f2dc053 5405 spin_lock_init(&mdsc->cap_delay_lock);
dbc347ef 5406 INIT_LIST_HEAD(&mdsc->cap_unlink_delay_list);
2f2dc053
SW		 5407 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5408 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 5409 mdsc->last_cap_flush_tid = 1;
e4500b5e 5410 INIT_LIST_HEAD(&mdsc->cap_flush_list);
db354052 5411 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 5412 spin_lock_init(&mdsc->cap_dirty_lock);
5413 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 5414 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
dbc347ef 5415 INIT_WORK(&mdsc->cap_unlink_work, ceph_cap_unlink_work);
f9009efa
XL		 5416 err = ceph_metric_init(&mdsc->metric);
5417 if (err)
5418 goto err_mdsmap;
37c4efc1
YZ		 5419
5420 spin_lock_init(&mdsc->dentry_list_lock);
5421 INIT_LIST_HEAD(&mdsc->dentry_leases);
5422 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 5423
37151668 5424 ceph_caps_init(mdsc);
fe33032d 5425 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 5426
75c9627e
YZ		 5427 spin_lock_init(&mdsc->snapid_map_lock);
5428 mdsc->snapid_map_tree = RB_ROOT;
5429 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5430
10183a69
YZ		 5431 init_rwsem(&mdsc->pool_perm_rwsem);
5432 mdsc->pool_perm_tree = RB_ROOT;
5433
dfeb84d4
YZ		 5434 strscpy(mdsc->nodename, utsname()->nodename,
5435 sizeof(mdsc->nodename));
a7caa88f
XL		 5436
5437 fsc->mdsc = mdsc;
5f44f142 5438 return 0;
f9009efa
XL		 5439
5440err_mdsmap:
5441 kfree(mdsc->mdsmap);
5442err_mdsc:
5443 kfree(mdsc);
5444 return err;
2f2dc053
SW		 5445}
5446
5447/*
5448 * Wait for safe replies on open mds requests. If we time out, drop
5449 * all requests from the tree to avoid dangling dentry refs.
5450 */
5451static void wait_requests(struct ceph_mds_client *mdsc)
5452{
38d46409 5453 struct ceph_client *cl = mdsc->fsc->client;
a319bf56 5454 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 5455 struct ceph_mds_request *req;
2f2dc053
SW		 5456
5457 mutex_lock(&mdsc->mutex);
44ca18f2 5458 if (__get_oldest_req(mdsc)) {
2f2dc053 5459 mutex_unlock(&mdsc->mutex);
44ca18f2 5460
38d46409 5461 doutc(cl, "waiting for requests\n");
2f2dc053 5462 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 5463 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5464
5465 /* tear down remaining requests */
44ca18f2
SW		 5466 mutex_lock(&mdsc->mutex);
5467 while ((req = __get_oldest_req(mdsc))) {
38d46409 5468 doutc(cl, "timed out on tid %llu\n", req->r_tid);
428138c9 5469 list_del_init(&req->r_wait);
44ca18f2 5470 __unregister_request(mdsc, req);
2f2dc053
SW		 5471 }
5472 }
5473 mutex_unlock(&mdsc->mutex);
38d46409 5474 doutc(cl, "done\n");
2f2dc053
SW		 5475}
5476
d095559c
XL		 5477void send_flush_mdlog(struct ceph_mds_session *s)
5478{
38d46409 5479 struct ceph_client *cl = s->s_mdsc->fsc->client;
d095559c
XL		 5480 struct ceph_msg *msg;
5481
5482 /*
5483 * Pre-luminous MDS crashes when it sees an unknown session request
5484 */
5485 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5486 return;
5487
5488 mutex_lock(&s->s_mutex);
38d46409
XL		 5489 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5490 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5491 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5492 s->s_seq);
5493 if (!msg) {
38d46409
XL		 5494 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5495 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5496 } else {
5497 ceph_con_send(&s->s_con, msg);
5498 }
5499 mutex_unlock(&s->s_mutex);
5500}
5501
2f2dc053
SW		 5502/*
5503 * called before mount is ro, and before dentries are torn down.
5504 * (hmm, does this still race with new lookups?)
5505 */
5506void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5507{
38d46409 5508 doutc(mdsc->fsc->client, "begin\n");
e7e607bd 5509 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
2f2dc053 5510
d095559c 5511 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
59b312f3 5512 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
afcdaea3 5513 ceph_flush_dirty_caps(mdsc);
2f2dc053 5514 wait_requests(mdsc);
17c688c3
SW		 5515
5516 /*
5517 * wait for reply handlers to drop their request refs and
5518 * their inode/dcache refs
5519 */
5520 ceph_msgr_flush();
0c44a8e0
LH		 5521
5522 ceph_cleanup_quotarealms_inodes(mdsc);
38d46409 5523 doutc(mdsc->fsc->client, "done\n");
2f2dc053
SW		 5524}
5525
5526/*
1b2ba3c5 5527 * flush the mdlog and wait for all write mds requests to flush.
2f2dc053 5528 */
1b2ba3c5
XL		 5529static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5530 u64 want_tid)
2f2dc053 5531{
38d46409 5532 struct ceph_client *cl = mdsc->fsc->client;
80fc7314 5533 struct ceph_mds_request *req = NULL, *nextreq;
1b2ba3c5 5534 struct ceph_mds_session *last_session = NULL;
44ca18f2 5535 struct rb_node *n;
2f2dc053
SW		 5536
5537 mutex_lock(&mdsc->mutex);
38d46409 5538 doutc(cl, "want %lld\n", want_tid);
80fc7314 5539restart:
44ca18f2
SW		 5540 req = __get_oldest_req(mdsc);
5541 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 5542 /* find next request */
5543 n = rb_next(&req->r_node);
5544 if (n)
5545 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5546 else
5547 nextreq = NULL;
e8a7b8b1
YZ		 5548 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5549 (req->r_op & CEPH_MDS_OP_WRITE)) {
1b2ba3c5
XL		 5550 struct ceph_mds_session *s = req->r_session;
5551
5552 if (!s) {
5553 req = nextreq;
5554 continue;
5555 }
5556
44ca18f2
SW		 5557 /* write op */
5558 ceph_mdsc_get_request(req);
80fc7314
SW		 5559 if (nextreq)
5560 ceph_mdsc_get_request(nextreq);
1b2ba3c5 5561 s = ceph_get_mds_session(s);
44ca18f2 5562 mutex_unlock(&mdsc->mutex);
1b2ba3c5
XL		 5563
5564 /* send flush mdlog request to MDS */
5565 if (last_session != s) {
5566 send_flush_mdlog(s);
5567 ceph_put_mds_session(last_session);
5568 last_session = s;
5569 } else {
5570 ceph_put_mds_session(s);
5571 }
38d46409
XL		 5572 doutc(cl, "wait on %llu (want %llu)\n",
5573 req->r_tid, want_tid);
44ca18f2 5574 wait_for_completion(&req->r_safe_completion);
1b2ba3c5 5575
44ca18f2 5576 mutex_lock(&mdsc->mutex);
44ca18f2 5577 ceph_mdsc_put_request(req);
80fc7314
SW		 5578 if (!nextreq)
5579 break; /* next dne before, so we're done! */
5580 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5581 /* next request was removed from tree */
5582 ceph_mdsc_put_request(nextreq);
5583 goto restart;
5584 }
5585 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 5586 }
80fc7314 5587 req = nextreq;
2f2dc053
SW		 5588 }
5589 mutex_unlock(&mdsc->mutex);
1b2ba3c5 5590 ceph_put_mds_session(last_session);
38d46409 5591 doutc(cl, "done\n");
2f2dc053
SW		 5592}
5593
5594void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5595{
38d46409 5596 struct ceph_client *cl = mdsc->fsc->client;
0e294387 5597 u64 want_tid, want_flush;
2f2dc053 5598
50c9132d 5599 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 5600 return;
5601
38d46409 5602 doutc(cl, "sync\n");
2f2dc053
SW		 5603 mutex_lock(&mdsc->mutex);
5604 want_tid = mdsc->last_tid;
2f2dc053 5605 mutex_unlock(&mdsc->mutex);
2f2dc053 5606
afcdaea3 5607 ceph_flush_dirty_caps(mdsc);
d3383a8e 5608 spin_lock(&mdsc->cap_dirty_lock);
8310b089 5609 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 5610 if (!list_empty(&mdsc->cap_flush_list)) {
5611 struct ceph_cap_flush *cf =
5612 list_last_entry(&mdsc->cap_flush_list,
5613 struct ceph_cap_flush, g_list);
5614 cf->wake = true;
5615 }
d3383a8e
YZ		 5616 spin_unlock(&mdsc->cap_dirty_lock);
5617
38d46409 5618 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2f2dc053 5619
1b2ba3c5 5620 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
0e294387 5621 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 5622}
5623
f3c60c59
SW		 5624/*
5625 * true if all sessions are closed, or we force unmount
5626 */
fcff415c 5627static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 5628{
52953d55 5629 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 5630 return true;
fcff415c 5631 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 5632}
2f2dc053
SW		 5633
5634/*
a68e564a 5635 * called after sb is ro or when metadata corrupted.
2f2dc053
SW		 5636 */
5637void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5638{
a319bf56 5639 struct ceph_options *opts = mdsc->fsc->client->options;
38d46409 5640 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5641 struct ceph_mds_session *session;
5642 int i;
fcff415c 5643 int skipped = 0;
2f2dc053 5644
38d46409 5645 doutc(cl, "begin\n");
2f2dc053 5646
2f2dc053 5647 /* close sessions */
f3c60c59
SW		 5648 mutex_lock(&mdsc->mutex);
5649 for (i = 0; i < mdsc->max_sessions; i++) {
5650 session = __ceph_lookup_mds_session(mdsc, i);
5651 if (!session)
5652 continue;
2f2dc053 5653 mutex_unlock(&mdsc->mutex);
f3c60c59 5654 mutex_lock(&session->s_mutex);
fcff415c
YZ		 5655 if (__close_session(mdsc, session) <= 0)
5656 skipped++;
f3c60c59
SW		 5657 mutex_unlock(&session->s_mutex);
5658 ceph_put_mds_session(session);
2f2dc053
SW		 5659 mutex_lock(&mdsc->mutex);
5660 }
f3c60c59
SW		 5661 mutex_unlock(&mdsc->mutex);
5662
38d46409 5663 doutc(cl, "waiting for sessions to close\n");
fcff415c
YZ		 5664 wait_event_timeout(mdsc->session_close_wq,
5665 done_closing_sessions(mdsc, skipped),
a319bf56 5666 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5667
5668 /* tear down remaining sessions */
f3c60c59 5669 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 5670 for (i = 0; i < mdsc->max_sessions; i++) {
5671 if (mdsc->sessions[i]) {
5b3248c6 5672 session = ceph_get_mds_session(mdsc->sessions[i]);
2600d2dd 5673 __unregister_session(mdsc, session);
2f2dc053
SW		 5674 mutex_unlock(&mdsc->mutex);
5675 mutex_lock(&session->s_mutex);
5676 remove_session_caps(session);
5677 mutex_unlock(&session->s_mutex);
5678 ceph_put_mds_session(session);
5679 mutex_lock(&mdsc->mutex);
5680 }
5681 }
2f2dc053 5682 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 5683 mutex_unlock(&mdsc->mutex);
5684
75c9627e 5685 ceph_cleanup_snapid_map(mdsc);
5ed91587 5686 ceph_cleanup_global_and_empty_realms(mdsc);
2f2dc053 5687
37c4efc1 5688 cancel_work_sync(&mdsc->cap_reclaim_work);
dbc347ef 5689 cancel_work_sync(&mdsc->cap_unlink_work);
2f2dc053
SW		 5690 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5691
38d46409 5692 doutc(cl, "done\n");
2f2dc053
SW		 5693}
5694
48fec5d0
YZ		 5695void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5696{
5697 struct ceph_mds_session *session;
5698 int mds;
5699
38d46409 5700 doutc(mdsc->fsc->client, "force umount\n");
48fec5d0
YZ		 5701
5702 mutex_lock(&mdsc->mutex);
5703 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5704 session = __ceph_lookup_mds_session(mdsc, mds);
5705 if (!session)
5706 continue;
d468e729
YZ		 5707
5708 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5709 __unregister_session(mdsc, session);
5710 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 5711 mutex_unlock(&mdsc->mutex);
d468e729 5712
48fec5d0
YZ		 5713 mutex_lock(&session->s_mutex);
5714 __close_session(mdsc, session);
5715 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5716 cleanup_session_requests(mdsc, session);
5717 remove_session_caps(session);
5718 }
5719 mutex_unlock(&session->s_mutex);
5720 ceph_put_mds_session(session);
d468e729 5721
48fec5d0
YZ		 5722 mutex_lock(&mdsc->mutex);
5723 kick_requests(mdsc, mds);
5724 }
5725 __wake_requests(mdsc, &mdsc->waiting_for_map);
5726 mutex_unlock(&mdsc->mutex);
5727}
5728
3d14c5d2 5729static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053 5730{
38d46409 5731 doutc(mdsc->fsc->client, "stop\n");
fa996773
XL		 5732 /*
5733 * Make sure the delayed work stopped before releasing
5734 * the resources.
5735 *
5736 * Because the cancel_delayed_work_sync() will only
5737 * guarantee that the work finishes executing. But the
5738 * delayed work will re-arm itself again after that.
5739 */
5740 flush_delayed_work(&mdsc->delayed_work);
5741
2f2dc053
SW		 5742 if (mdsc->mdsmap)
5743 ceph_mdsmap_destroy(mdsc->mdsmap);
5744 kfree(mdsc->sessions);
37151668 5745 ceph_caps_finalize(mdsc);
10183a69 5746 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 5747}
5748
3d14c5d2
YS		 5749void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
5750{
5751 struct ceph_mds_client *mdsc = fsc->mdsc;
38d46409 5752 doutc(fsc->client, "%p\n", mdsc);
ef550f6f 5753
50c55aec
CX		 5754 if (!mdsc)
5755 return;
5756
ef550f6f
SW		 5757 /* flush out any connection work with references to us */
5758 ceph_msgr_flush();
5759
62a65f36
YZ		 5760 ceph_mdsc_stop(mdsc);
5761
f9009efa
XL		 5762 ceph_metric_destroy(&mdsc->metric);
5763
3d14c5d2
YS		 5764 fsc->mdsc = NULL;
5765 kfree(mdsc);
38d46409 5766 doutc(fsc->client, "%p done\n", mdsc);
3d14c5d2
YS		 5767}
5768
430afbad
YZ		 5769void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5770{
5771 struct ceph_fs_client *fsc = mdsc->fsc;
38d46409 5772 struct ceph_client *cl = fsc->client;
430afbad
YZ		 5773 const char *mds_namespace = fsc->mount_options->mds_namespace;
5774 void *p = msg->front.iov_base;
5775 void *end = p + msg->front.iov_len;
5776 u32 epoch;
430afbad
YZ		 5777 u32 num_fs;
5778 u32 mount_fscid = (u32)-1;
430afbad
YZ		 5779 int err = -EINVAL;
5780
5781 ceph_decode_need(&p, end, sizeof(u32), bad);
5782 epoch = ceph_decode_32(&p);
5783
38d46409 5784 doutc(cl, "epoch %u\n", epoch);
430afbad 5785
06a1ad43
JL		 5786 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5787 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
430afbad 5788
06a1ad43 5789 ceph_decode_32_safe(&p, end, num_fs, bad);
430afbad
YZ		 5790 while (num_fs-- > 0) {
5791 void *info_p, *info_end;
5792 u32 info_len;
430afbad
YZ		 5793 u32 fscid, namelen;
5794
5795 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
06a1ad43 5796 p += 2; // info_v, info_cv
430afbad
YZ		 5797 info_len = ceph_decode_32(&p);
5798 ceph_decode_need(&p, end, info_len, bad);
5799 info_p = p;
5800 info_end = p + info_len;
5801 p = info_end;
5802
5803 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5804 fscid = ceph_decode_32(&info_p);
5805 namelen = ceph_decode_32(&info_p);
5806 ceph_decode_need(&info_p, info_end, namelen, bad);
5807
5808 if (mds_namespace &&
5809 strlen(mds_namespace) == namelen &&
5810 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5811 mount_fscid = fscid;
5812 break;
5813 }
5814 }
5815
5816 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5817 if (mount_fscid != (u32)-1) {
5818 fsc->client->monc.fs_cluster_id = mount_fscid;
5819 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5820 0, true);
5821 ceph_monc_renew_subs(&fsc->client->monc);
5822 } else {
5823 err = -ENOENT;
5824 goto err_out;
5825 }
5826 return;
76bd6ec4 5827
430afbad 5828bad:
38d46409
XL		 5829 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
5830 err);
631ed4b0 5831 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 5832 ceph_msg_dump(msg);
430afbad
YZ		 5833err_out:
5834 mutex_lock(&mdsc->mutex);
76bd6ec4 5835 mdsc->mdsmap_err = err;
430afbad
YZ		 5836 __wake_requests(mdsc, &mdsc->waiting_for_map);
5837 mutex_unlock(&mdsc->mutex);
430afbad 5838}
2f2dc053
SW		 5839
5840/*
5841 * handle mds map update.
5842 */
430afbad 5843void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053 5844{
38d46409 5845 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5846 u32 epoch;
5847 u32 maplen;
5848 void *p = msg->front.iov_base;
5849 void *end = p + msg->front.iov_len;
5850 struct ceph_mdsmap *newmap, *oldmap;
5851 struct ceph_fsid fsid;
5852 int err = -EINVAL;
5853
5854 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5855 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 5856 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 5857 return;
c89136ea
SW		 5858 epoch = ceph_decode_32(&p);
5859 maplen = ceph_decode_32(&p);
38d46409 5860 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
2f2dc053
SW		 5861
5862 /* do we need it? */
2f2dc053
SW		 5863 mutex_lock(&mdsc->mutex);
5864 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
38d46409 5865 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
2f2dc053
SW		 5866 mutex_unlock(&mdsc->mutex);
5867 return;
5868 }
5869
197b7d79 5870 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
2f2dc053
SW		 5871 if (IS_ERR(newmap)) {
5872 err = PTR_ERR(newmap);
5873 goto bad_unlock;
5874 }
5875
5876 /* swap into place */
5877 if (mdsc->mdsmap) {
5878 oldmap = mdsc->mdsmap;
5879 mdsc->mdsmap = newmap;
5880 check_new_map(mdsc, newmap, oldmap);
5881 ceph_mdsmap_destroy(oldmap);
5882 } else {
5883 mdsc->mdsmap = newmap; /* first mds map */
5884 }
719784ba
CX		 5885 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5886 MAX_LFS_FILESIZE);
2f2dc053
SW		 5887
5888 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 5889 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5890 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 5891
5892 mutex_unlock(&mdsc->mutex);
bf2ba432 5893 schedule_delayed(mdsc, 0);
2f2dc053
SW		 5894 return;
5895
5896bad_unlock:
5897 mutex_unlock(&mdsc->mutex);
5898bad:
38d46409
XL		 5899 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
5900 err);
631ed4b0 5901 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 5902 ceph_msg_dump(msg);
2f2dc053
SW		 5903 return;
5904}
5905
4972cf60 5906static struct ceph_connection *mds_get_con(struct ceph_connection *con)
2f2dc053
SW		 5907{
5908 struct ceph_mds_session *s = con->private;
5909
5b3248c6 5910 if (ceph_get_mds_session(s))
2f2dc053 5911 return con;
2f2dc053
SW		 5912 return NULL;
5913}
5914
4972cf60 5915static void mds_put_con(struct ceph_connection *con)
2f2dc053
SW		 5916{
5917 struct ceph_mds_session *s = con->private;
5918
2f2dc053
SW		 5919 ceph_put_mds_session(s);
5920}
5921
5922/*
5923 * if the client is unresponsive for long enough, the mds will kill
5924 * the session entirely.
5925 */
4972cf60 5926static void mds_peer_reset(struct ceph_connection *con)
2f2dc053
SW		 5927{
5928 struct ceph_mds_session *s = con->private;
7e70f0ed 5929 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 5930
38d46409
XL		 5931 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
5932 s->s_mds);
cbcb358b
XL		 5933 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO &&
5934 ceph_mdsmap_get_state(mdsc->mdsmap, s->s_mds) >= CEPH_MDS_STATE_RECONNECT)
a68e564a 5935 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 5936}
5937
4972cf60 5938static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2f2dc053
SW		 5939{
5940 struct ceph_mds_session *s = con->private;
5941 struct ceph_mds_client *mdsc = s->s_mdsc;
38d46409 5942 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5943 int type = le16_to_cpu(msg->hdr.type);
5944
2600d2dd
SW		 5945 mutex_lock(&mdsc->mutex);
5946 if (__verify_registered_session(mdsc, s) < 0) {
5947 mutex_unlock(&mdsc->mutex);
5948 goto out;
5949 }
5950 mutex_unlock(&mdsc->mutex);
5951
2f2dc053
SW		 5952 switch (type) {
5953 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 5954 ceph_mdsc_handle_mdsmap(mdsc, msg);
5955 break;
5956 case CEPH_MSG_FS_MAP_USER:
5957 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 5958 break;
5959 case CEPH_MSG_CLIENT_SESSION:
5960 handle_session(s, msg);
5961 break;
5962 case CEPH_MSG_CLIENT_REPLY:
5963 handle_reply(s, msg);
5964 break;
5965 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 5966 handle_forward(mdsc, s, msg);
2f2dc053
SW		 5967 break;
5968 case CEPH_MSG_CLIENT_CAPS:
5969 ceph_handle_caps(s, msg);
5970 break;
5971 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 5972 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 5973 break;
5974 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 5975 handle_lease(mdsc, s, msg);
2f2dc053 5976 break;
fb18a575
LH		 5977 case CEPH_MSG_CLIENT_QUOTA:
5978 ceph_handle_quota(mdsc, s, msg);
5979 break;
2f2dc053
SW		 5980
5981 default:
38d46409
XL		 5982 pr_err_client(cl, "received unknown message type %d %s\n",
5983 type, ceph_msg_type_name(type));
2f2dc053 5984 }
2600d2dd 5985out:
2f2dc053
SW		 5986 ceph_msg_put(msg);
5987}
5988
4e7a5dcd
SW		 5989/*
5990 * authentication
5991 */
a3530df3
AE		 5992
5993/*
5994 * Note: returned pointer is the address of a structure that's
5995 * managed separately. Caller must *not* attempt to free it.
5996 */
4972cf60
ID		 5997static struct ceph_auth_handshake *
5998mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
4e7a5dcd
SW		 5999{
6000 struct ceph_mds_session *s = con->private;
6001 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6002 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 6003 struct ceph_auth_handshake *auth = &s->s_auth;
ce287162 6004 int ret;
4e7a5dcd 6005
ce287162
ID		 6006 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6007 force_new, proto, NULL, NULL);
6008 if (ret)
6009 return ERR_PTR(ret);
74f1869f 6010
a3530df3 6011 return auth;
4e7a5dcd
SW		 6012}
6013
4972cf60 6014static int mds_add_authorizer_challenge(struct ceph_connection *con,
6daca13d
ID		 6015 void *challenge_buf, int challenge_buf_len)
6016{
6017 struct ceph_mds_session *s = con->private;
6018 struct ceph_mds_client *mdsc = s->s_mdsc;
6019 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
6020
6021 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
6022 challenge_buf, challenge_buf_len);
6023}
4e7a5dcd 6024
4972cf60 6025static int mds_verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 6026{
6027 struct ceph_mds_session *s = con->private;
6028 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6029 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
285ea34f 6030 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 6031
285ea34f
ID		 6032 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
6033 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
6034 NULL, NULL, NULL, NULL);
4e7a5dcd
SW		 6035}
6036
4972cf60 6037static int mds_invalidate_authorizer(struct ceph_connection *con)
9bd2e6f8
SW		 6038{
6039 struct ceph_mds_session *s = con->private;
6040 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 6041 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 6042
27859f97 6043 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 6044
3d14c5d2 6045 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 6046}
6047
cd1a677c
ID		 6048static int mds_get_auth_request(struct ceph_connection *con,
6049 void *buf, int *buf_len,
6050 void **authorizer, int *authorizer_len)
6051{
6052 struct ceph_mds_session *s = con->private;
6053 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6054 struct ceph_auth_handshake *auth = &s->s_auth;
6055 int ret;
6056
6057 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
6058 buf, buf_len);
6059 if (ret)
6060 return ret;
6061
6062 *authorizer = auth->authorizer_buf;
6063 *authorizer_len = auth->authorizer_buf_len;
6064 return 0;
6065}
6066
6067static int mds_handle_auth_reply_more(struct ceph_connection *con,
6068 void *reply, int reply_len,
6069 void *buf, int *buf_len,
6070 void **authorizer, int *authorizer_len)
6071{
6072 struct ceph_mds_session *s = con->private;
6073 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6074 struct ceph_auth_handshake *auth = &s->s_auth;
6075 int ret;
6076
6077 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6078 buf, buf_len);
6079 if (ret)
6080 return ret;
6081
6082 *authorizer = auth->authorizer_buf;
6083 *authorizer_len = auth->authorizer_buf_len;
6084 return 0;
6085}
6086
6087static int mds_handle_auth_done(struct ceph_connection *con,
6088 u64 global_id, void *reply, int reply_len,
6089 u8 *session_key, int *session_key_len,
6090 u8 *con_secret, int *con_secret_len)
6091{
6092 struct ceph_mds_session *s = con->private;
6093 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6094 struct ceph_auth_handshake *auth = &s->s_auth;
6095
6096 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6097 session_key, session_key_len,
6098 con_secret, con_secret_len);
6099}
6100
6101static int mds_handle_auth_bad_method(struct ceph_connection *con,
6102 int used_proto, int result,
6103 const int *allowed_protos, int proto_cnt,
6104 const int *allowed_modes, int mode_cnt)
6105{
6106 struct ceph_mds_session *s = con->private;
6107 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6108 int ret;
6109
6110 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6111 used_proto, result,
6112 allowed_protos, proto_cnt,
6113 allowed_modes, mode_cnt)) {
6114 ret = ceph_monc_validate_auth(monc);
6115 if (ret)
6116 return ret;
6117 }
6118
6119 return -EACCES;
6120}
6121
53ded495
AE		 6122static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6123 struct ceph_msg_header *hdr, int *skip)
6124{
6125 struct ceph_msg *msg;
6126 int type = (int) le16_to_cpu(hdr->type);
6127 int front_len = (int) le32_to_cpu(hdr->front_len);
6128
6129 if (con->in_msg)
6130 return con->in_msg;
6131
6132 *skip = 0;
6133 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6134 if (!msg) {
6135 pr_err("unable to allocate msg type %d len %d\n",
6136 type, front_len);
6137 return NULL;
6138 }
53ded495
AE		 6139
6140 return msg;
6141}
6142
79dbd1ba 6143static int mds_sign_message(struct ceph_msg *msg)
33d07337 6144{
79dbd1ba 6145 struct ceph_mds_session *s = msg->con->private;
33d07337 6146 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6147
33d07337
YZ		 6148 return ceph_auth_sign_message(auth, msg);
6149}
6150
79dbd1ba 6151static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 6152{
79dbd1ba 6153 struct ceph_mds_session *s = msg->con->private;
33d07337 6154 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6155
33d07337
YZ		 6156 return ceph_auth_check_message_signature(auth, msg);
6157}
6158
9e32789f 6159static const struct ceph_connection_operations mds_con_ops = {
4972cf60
ID		 6160 .get = mds_get_con,
6161 .put = mds_put_con,
53ded495 6162 .alloc_msg = mds_alloc_msg,
4972cf60
ID		 6163 .dispatch = mds_dispatch,
6164 .peer_reset = mds_peer_reset,
6165 .get_authorizer = mds_get_authorizer,
6166 .add_authorizer_challenge = mds_add_authorizer_challenge,
6167 .verify_authorizer_reply = mds_verify_authorizer_reply,
6168 .invalidate_authorizer = mds_invalidate_authorizer,
79dbd1ba
ID		 6169 .sign_message = mds_sign_message,
6170 .check_message_signature = mds_check_message_signature,
cd1a677c
ID		 6171 .get_auth_request = mds_get_auth_request,
6172 .handle_auth_reply_more = mds_handle_auth_reply_more,
6173 .handle_auth_done = mds_handle_auth_done,
6174 .handle_auth_bad_method = mds_handle_auth_bad_method,
2f2dc053
SW		 6175};
6176
2f2dc053 6177/* eof */
Linux 6.x block layer and io_uring tree(s)