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Merge tag 'block-6.7-2023-12-22' of git://git.kernel.dk/linux
[thirdparty/linux.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52 * are no longer valid.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);
e64f44a8 1092 ceph_mdsc_release_dir_caps_no_check(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 */
1537static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1538{
1539 struct ceph_msg *msg;
1540 struct ceph_mds_session_head *h;
4a756db2 1541 int i;
342ce182 1542 int extra_bytes = 0;
dbd0c8bf
JS		 1543 int metadata_key_count = 0;
1544 struct ceph_options *opt = mdsc->fsc->client->options;
3f384954 1545 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
38d46409 1546 struct ceph_client *cl = mdsc->fsc->client;
9ba1e224 1547 size_t size, count;
342ce182 1548 void *p, *end;
b682c6d4 1549 int ret;
dbd0c8bf 1550
a6a5ce4f 1551 const char* metadata[][2] = {
717e6f28
YZ		 1552 {"hostname", mdsc->nodename},
1553 {"kernel_version", init_utsname()->release},
3f384954
YZ		 1554 {"entity_id", opt->name ? : ""},
1555 {"root", fsopt->server_path ? : "/"},
dbd0c8bf
JS		 1556 {NULL, NULL}
1557 };
1558
1559 /* Calculate serialized length of metadata */
342ce182 1560 extra_bytes = 4; /* map length */
d37b1d99 1561 for (i = 0; metadata[i][0]; ++i) {
342ce182 1562 extra_bytes += 8 + strlen(metadata[i][0]) +
dbd0c8bf
JS		 1563 strlen(metadata[i][1]);
1564 metadata_key_count++;
1565 }
9ba1e224 1566
342ce182 1567 /* supported feature */
9ba1e224
XL		 1568 size = 0;
1569 count = ARRAY_SIZE(feature_bits);
1570 if (count > 0)
1571 size = FEATURE_BYTES(count);
1572 extra_bytes += 4 + size;
dbd0c8bf 1573
3b4168dd
XL		 1574 /* metric spec */
1575 size = 0;
1576 count = ARRAY_SIZE(metric_bits);
1577 if (count > 0)
1578 size = METRIC_BYTES(count);
1579 extra_bytes += 2 + 4 + 4 + size;
1580
dbd0c8bf 1581 /* Allocate the message */
342ce182 1582 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
dbd0c8bf
JS		 1583 GFP_NOFS, false);
1584 if (!msg) {
38d46409 1585 pr_err_client(cl, "ENOMEM creating session open msg\n");
b682c6d4 1586 return ERR_PTR(-ENOMEM);
dbd0c8bf 1587 }
342ce182
YZ		 1588 p = msg->front.iov_base;
1589 end = p + msg->front.iov_len;
1590
1591 h = p;
dbd0c8bf
JS		 1592 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1593 h->seq = cpu_to_le64(seq);
1594
1595 /*
1596 * Serialize client metadata into waiting buffer space, using
1597 * the format that userspace expects for map<string, string>
7cfa0313 1598 *
3b4168dd 1599 * ClientSession messages with metadata are v4
dbd0c8bf 1600 */
3b4168dd 1601 msg->hdr.version = cpu_to_le16(4);
7cfa0313 1602 msg->hdr.compat_version = cpu_to_le16(1);
dbd0c8bf
JS		 1603
1604 /* The write pointer, following the session_head structure */
342ce182 1605 p += sizeof(*h);
dbd0c8bf
JS		 1606
1607 /* Number of entries in the map */
1608 ceph_encode_32(&p, metadata_key_count);
1609
1610 /* Two length-prefixed strings for each entry in the map */
d37b1d99 1611 for (i = 0; metadata[i][0]; ++i) {
dbd0c8bf
JS		 1612 size_t const key_len = strlen(metadata[i][0]);
1613 size_t const val_len = strlen(metadata[i][1]);
1614
1615 ceph_encode_32(&p, key_len);
1616 memcpy(p, metadata[i][0], key_len);
1617 p += key_len;
1618 ceph_encode_32(&p, val_len);
1619 memcpy(p, metadata[i][1], val_len);
1620 p += val_len;
1621 }
1622
b682c6d4
XL		 1623 ret = encode_supported_features(&p, end);
1624 if (ret) {
38d46409 1625 pr_err_client(cl, "encode_supported_features failed!\n");
b682c6d4
XL		 1626 ceph_msg_put(msg);
1627 return ERR_PTR(ret);
1628 }
1629
3b4168dd
XL		 1630 ret = encode_metric_spec(&p, end);
1631 if (ret) {
38d46409 1632 pr_err_client(cl, "encode_metric_spec failed!\n");
3b4168dd
XL		 1633 ceph_msg_put(msg);
1634 return ERR_PTR(ret);
1635 }
1636
342ce182
YZ		 1637 msg->front.iov_len = p - msg->front.iov_base;
1638 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1639
2f2dc053
SW		 1640 return msg;
1641}
1642
1643/*
1644 * send session open request.
1645 *
1646 * called under mdsc->mutex
1647 */
1648static int __open_session(struct ceph_mds_client *mdsc,
1649 struct ceph_mds_session *session)
1650{
1651 struct ceph_msg *msg;
1652 int mstate;
1653 int mds = session->s_mds;
2f2dc053 1654
a68e564a
XL		 1655 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1656 return -EIO;
1657
2f2dc053
SW		 1658 /* wait for mds to go active? */
1659 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
38d46409
XL		 1660 doutc(mdsc->fsc->client, "open_session to mds%d (%s)\n", mds,
1661 ceph_mds_state_name(mstate));
2f2dc053
SW		 1662 session->s_state = CEPH_MDS_SESSION_OPENING;
1663 session->s_renew_requested = jiffies;
1664
1665 /* send connect message */
dbd0c8bf 1666 msg = create_session_open_msg(mdsc, session->s_seq);
b682c6d4
XL		 1667 if (IS_ERR(msg))
1668 return PTR_ERR(msg);
2f2dc053 1669 ceph_con_send(&session->s_con, msg);
2f2dc053
SW		 1670 return 0;
1671}
1672
ed0552a1
SW		 1673/*
1674 * open sessions for any export targets for the given mds
1675 *
1676 * called under mdsc->mutex
1677 */
5d72d13c
YZ		 1678static struct ceph_mds_session *
1679__open_export_target_session(struct ceph_mds_client *mdsc, int target)
1680{
1681 struct ceph_mds_session *session;
b682c6d4 1682 int ret;
5d72d13c
YZ		 1683
1684 session = __ceph_lookup_mds_session(mdsc, target);
1685 if (!session) {
1686 session = register_session(mdsc, target);
1687 if (IS_ERR(session))
1688 return session;
1689 }
1690 if (session->s_state == CEPH_MDS_SESSION_NEW ||
b682c6d4
XL		 1691 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1692 ret = __open_session(mdsc, session);
1693 if (ret)
1694 return ERR_PTR(ret);
1695 }
5d72d13c
YZ		 1696
1697 return session;
1698}
1699
1700struct ceph_mds_session *
1701ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1702{
1703 struct ceph_mds_session *session;
38d46409 1704 struct ceph_client *cl = mdsc->fsc->client;
5d72d13c 1705
38d46409 1706 doutc(cl, "to mds%d\n", target);
5d72d13c
YZ		 1707
1708 mutex_lock(&mdsc->mutex);
1709 session = __open_export_target_session(mdsc, target);
1710 mutex_unlock(&mdsc->mutex);
1711
1712 return session;
1713}
1714
ed0552a1
SW		 1715static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1716 struct ceph_mds_session *session)
1717{
1718 struct ceph_mds_info *mi;
1719 struct ceph_mds_session *ts;
1720 int i, mds = session->s_mds;
38d46409 1721 struct ceph_client *cl = mdsc->fsc->client;
ed0552a1 1722
b38c9eb4 1723 if (mds >= mdsc->mdsmap->possible_max_rank)
ed0552a1 1724 return;
5d72d13c 1725
ed0552a1 1726 mi = &mdsc->mdsmap->m_info[mds];
38d46409
XL		 1727 doutc(cl, "for mds%d (%d targets)\n", session->s_mds,
1728 mi->num_export_targets);
ed0552a1
SW		 1729
1730 for (i = 0; i < mi->num_export_targets; i++) {
5d72d13c 1731 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
7e65624d 1732 ceph_put_mds_session(ts);
ed0552a1
SW		 1733 }
1734}
1735
154f42c2
SW		 1736void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1737 struct ceph_mds_session *session)
1738{
1739 mutex_lock(&mdsc->mutex);
1740 __open_export_target_sessions(mdsc, session);
1741 mutex_unlock(&mdsc->mutex);
1742}
1743
2f2dc053
SW		 1744/*
1745 * session caps
1746 */
1747
c8a96a31
JL		 1748static void detach_cap_releases(struct ceph_mds_session *session,
1749 struct list_head *target)
2f2dc053 1750{
38d46409
XL		 1751 struct ceph_client *cl = session->s_mdsc->fsc->client;
1752
c8a96a31
JL		 1753 lockdep_assert_held(&session->s_cap_lock);
1754
1755 list_splice_init(&session->s_cap_releases, target);
745a8e3b 1756 session->s_num_cap_releases = 0;
38d46409 1757 doutc(cl, "mds%d\n", session->s_mds);
c8a96a31 1758}
2f2dc053 1759
c8a96a31
JL		 1760static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1761 struct list_head *dispose)
1762{
1763 while (!list_empty(dispose)) {
745a8e3b
YZ		 1764 struct ceph_cap *cap;
1765 /* zero out the in-progress message */
c8a96a31 1766 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
745a8e3b
YZ		 1767 list_del(&cap->session_caps);
1768 ceph_put_cap(mdsc, cap);
2f2dc053 1769 }
2f2dc053
SW		 1770}
1771
1c841a96
YZ		 1772static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1773 struct ceph_mds_session *session)
1774{
38d46409 1775 struct ceph_client *cl = mdsc->fsc->client;
1c841a96
YZ		 1776 struct ceph_mds_request *req;
1777 struct rb_node *p;
1778
38d46409 1779 doutc(cl, "mds%d\n", session->s_mds);
1c841a96
YZ		 1780 mutex_lock(&mdsc->mutex);
1781 while (!list_empty(&session->s_unsafe)) {
1782 req = list_first_entry(&session->s_unsafe,
1783 struct ceph_mds_request, r_unsafe_item);
38d46409
XL		 1784 pr_warn_ratelimited_client(cl, " dropping unsafe request %llu\n",
1785 req->r_tid);
1bd85aa6
JL		 1786 if (req->r_target_inode)
1787 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1788 if (req->r_unsafe_dir)
1789 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1c841a96
YZ		 1790 __unregister_request(mdsc, req);
1791 }
1792 /* zero r_attempts, so kick_requests() will re-send requests */
1793 p = rb_first(&mdsc->request_tree);
1794 while (p) {
1795 req = rb_entry(p, struct ceph_mds_request, r_node);
1796 p = rb_next(p);
1797 if (req->r_session &&
1798 req->r_session->s_mds == session->s_mds)
1799 req->r_attempts = 0;
1800 }
1801 mutex_unlock(&mdsc->mutex);
1802}
1803
2f2dc053 1804/*
f818a736
SW		 1805 * Helper to safely iterate over all caps associated with a session, with
1806 * special care taken to handle a racing __ceph_remove_cap().
2f2dc053 1807 *
f818a736 1808 * Caller must hold session s_mutex.
2f2dc053 1809 */
f5d77269 1810int ceph_iterate_session_caps(struct ceph_mds_session *session,
aaf67de7
XL		 1811 int (*cb)(struct inode *, int mds, void *),
1812 void *arg)
2f2dc053 1813{
38d46409 1814 struct ceph_client *cl = session->s_mdsc->fsc->client;
7c1332b8
SW		 1815 struct list_head *p;
1816 struct ceph_cap *cap;
1817 struct inode *inode, *last_inode = NULL;
1818 struct ceph_cap *old_cap = NULL;
2f2dc053
SW		 1819 int ret;
1820
38d46409 1821 doutc(cl, "%p mds%d\n", session, session->s_mds);
2f2dc053 1822 spin_lock(&session->s_cap_lock);
7c1332b8
SW		 1823 p = session->s_caps.next;
1824 while (p != &session->s_caps) {
aaf67de7
XL		 1825 int mds;
1826
7c1332b8 1827 cap = list_entry(p, struct ceph_cap, session_caps);
874c8ca1 1828 inode = igrab(&cap->ci->netfs.inode);
7c1332b8
SW		 1829 if (!inode) {
1830 p = p->next;
2f2dc053 1831 continue;
7c1332b8
SW		 1832 }
1833 session->s_cap_iterator = cap;
aaf67de7 1834 mds = cap->mds;
2f2dc053 1835 spin_unlock(&session->s_cap_lock);
7c1332b8
SW		 1836
1837 if (last_inode) {
23c2c76e 1838 iput(last_inode);
7c1332b8
SW		 1839 last_inode = NULL;
1840 }
1841 if (old_cap) {
37151668 1842 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8
SW		 1843 old_cap = NULL;
1844 }
1845
aaf67de7 1846 ret = cb(inode, mds, arg);
7c1332b8
SW		 1847 last_inode = inode;
1848
2f2dc053 1849 spin_lock(&session->s_cap_lock);
7c1332b8 1850 p = p->next;
d37b1d99 1851 if (!cap->ci) {
38d46409 1852 doutc(cl, "finishing cap %p removal\n", cap);
7c1332b8 1853 BUG_ON(cap->session != session);
745a8e3b 1854 cap->session = NULL;
7c1332b8
SW		 1855 list_del_init(&cap->session_caps);
1856 session->s_nr_caps--;
4f1d756d 1857 atomic64_dec(&session->s_mdsc->metric.total_caps);
e3ec8d68
YZ		 1858 if (cap->queue_release)
1859 __ceph_queue_cap_release(session, cap);
1860 else
745a8e3b 1861 old_cap = cap; /* put_cap it w/o locks held */
7c1332b8 1862 }
5dacf091
SW		 1863 if (ret < 0)
1864 goto out;
2f2dc053 1865 }
5dacf091
SW		 1866 ret = 0;
1867out:
7c1332b8 1868 session->s_cap_iterator = NULL;
2f2dc053 1869 spin_unlock(&session->s_cap_lock);
7c1332b8 1870
23c2c76e 1871 iput(last_inode);
7c1332b8 1872 if (old_cap)
37151668 1873 ceph_put_cap(session->s_mdsc, old_cap);
7c1332b8 1874
5dacf091 1875 return ret;
2f2dc053
SW		 1876}
1877
aaf67de7 1878static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053
SW		 1879{
1880 struct ceph_inode_info *ci = ceph_inode(inode);
38d46409 1881 struct ceph_client *cl = ceph_inode_to_client(inode);
6c93df5d 1882 bool invalidate = false;
aaf67de7
XL		 1883 struct ceph_cap *cap;
1884 int iputs = 0;
6c99f254 1885
be655596 1886 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 1887 cap = __get_cap_for_mds(ci, mds);
1888 if (cap) {
38d46409
XL		 1889 doutc(cl, " removing cap %p, ci is %p, inode is %p\n",
1890 cap, ci, &ci->netfs.inode);
aaf67de7
XL		 1891
1892 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1893 }
be655596 1894 spin_unlock(&ci->i_ceph_lock);
77310320 1895
aaf67de7
XL		 1896 if (cap)
1897 wake_up_all(&ci->i_cap_wq);
6c93df5d
YZ		 1898 if (invalidate)
1899 ceph_queue_invalidate(inode);
36e6da98 1900 while (iputs--)
a6d37ccd 1901 iput(inode);
2f2dc053
SW		 1902 return 0;
1903}
1904
1905/*
1906 * caller must hold session s_mutex
1907 */
1908static void remove_session_caps(struct ceph_mds_session *session)
1909{
6c93df5d
YZ		 1910 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1911 struct super_block *sb = fsc->sb;
c8a96a31
JL		 1912 LIST_HEAD(dispose);
1913
38d46409 1914 doutc(fsc->client, "on %p\n", session);
f5d77269 1915 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
6f60f889 1916
c8799fc4
YZ		 1917 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1918
6f60f889
YZ		 1919 spin_lock(&session->s_cap_lock);
1920 if (session->s_nr_caps > 0) {
6f60f889
YZ		 1921 struct inode *inode;
1922 struct ceph_cap *cap, *prev = NULL;
1923 struct ceph_vino vino;
1924 /*
1925 * iterate_session_caps() skips inodes that are being
1926 * deleted, we need to wait until deletions are complete.
1927 * __wait_on_freeing_inode() is designed for the job,
1928 * but it is not exported, so use lookup inode function
1929 * to access it.
1930 */
1931 while (!list_empty(&session->s_caps)) {
1932 cap = list_entry(session->s_caps.next,
1933 struct ceph_cap, session_caps);
1934 if (cap == prev)
1935 break;
1936 prev = cap;
1937 vino = cap->ci->i_vino;
1938 spin_unlock(&session->s_cap_lock);
1939
ed284c49 1940 inode = ceph_find_inode(sb, vino);
23c2c76e 1941 iput(inode);
6f60f889
YZ		 1942
1943 spin_lock(&session->s_cap_lock);
1944 }
1945 }
745a8e3b
YZ		 1946
1947 // drop cap expires and unlock s_cap_lock
c8a96a31 1948 detach_cap_releases(session, &dispose);
6f60f889 1949
2f2dc053 1950 BUG_ON(session->s_nr_caps > 0);
6c99f254 1951 BUG_ON(!list_empty(&session->s_cap_flushing));
c8a96a31
JL		 1952 spin_unlock(&session->s_cap_lock);
1953 dispose_cap_releases(session->s_mdsc, &dispose);
2f2dc053
SW		 1954}
1955
d2f8bb27
YZ		 1956enum {
1957 RECONNECT,
1958 RENEWCAPS,
1959 FORCE_RO,
1960};
1961
2f2dc053
SW		 1962/*
1963 * wake up any threads waiting on this session's caps. if the cap is
1964 * old (didn't get renewed on the client reconnect), remove it now.
1965 *
1966 * caller must hold s_mutex.
1967 */
aaf67de7 1968static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
2f2dc053 1969{
0dc2570f 1970 struct ceph_inode_info *ci = ceph_inode(inode);
d2f8bb27 1971 unsigned long ev = (unsigned long)arg;
0dc2570f 1972
d2f8bb27 1973 if (ev == RECONNECT) {
be655596 1974 spin_lock(&ci->i_ceph_lock);
0dc2570f
SW		 1975 ci->i_wanted_max_size = 0;
1976 ci->i_requested_max_size = 0;
be655596 1977 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1978 } else if (ev == RENEWCAPS) {
aaf67de7
XL		 1979 struct ceph_cap *cap;
1980
1981 spin_lock(&ci->i_ceph_lock);
1982 cap = __get_cap_for_mds(ci, mds);
1983 /* mds did not re-issue stale cap */
1984 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
d2f8bb27 1985 cap->issued = cap->implemented = CEPH_CAP_PIN;
aaf67de7 1986 spin_unlock(&ci->i_ceph_lock);
d2f8bb27 1987 } else if (ev == FORCE_RO) {
0dc2570f 1988 }
e5360309 1989 wake_up_all(&ci->i_cap_wq);
2f2dc053
SW		 1990 return 0;
1991}
1992
d2f8bb27 1993static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
2f2dc053 1994{
38d46409
XL		 1995 struct ceph_client *cl = session->s_mdsc->fsc->client;
1996
1997 doutc(cl, "session %p mds%d\n", session, session->s_mds);
f5d77269
JL		 1998 ceph_iterate_session_caps(session, wake_up_session_cb,
1999 (void *)(unsigned long)ev);
2f2dc053
SW		 2000}
2001
2002/*
2003 * Send periodic message to MDS renewing all currently held caps. The
2004 * ack will reset the expiration for all caps from this session.
2005 *
2006 * caller holds s_mutex
2007 */
2008static int send_renew_caps(struct ceph_mds_client *mdsc,
2009 struct ceph_mds_session *session)
2010{
38d46409 2011 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2012 struct ceph_msg *msg;
2013 int state;
2014
2015 if (time_after_eq(jiffies, session->s_cap_ttl) &&
2016 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
38d46409 2017 pr_info_client(cl, "mds%d caps stale\n", session->s_mds);
e4cb4cb8 2018 session->s_renew_requested = jiffies;
2f2dc053
SW		 2019
2020 /* do not try to renew caps until a recovering mds has reconnected
2021 * with its clients. */
2022 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
2023 if (state < CEPH_MDS_STATE_RECONNECT) {
38d46409
XL		 2024 doutc(cl, "ignoring mds%d (%s)\n", session->s_mds,
2025 ceph_mds_state_name(state));
2f2dc053
SW		 2026 return 0;
2027 }
2028
38d46409
XL		 2029 doutc(cl, "to mds%d (%s)\n", session->s_mds,
2030 ceph_mds_state_name(state));
fba97e80
XL		 2031 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
2032 ++session->s_renew_seq);
a79832f2
SW		 2033 if (!msg)
2034 return -ENOMEM;
2f2dc053
SW		 2035 ceph_con_send(&session->s_con, msg);
2036 return 0;
2037}
2038
186e4f7a
YZ		 2039static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2040 struct ceph_mds_session *session, u64 seq)
2041{
38d46409 2042 struct ceph_client *cl = mdsc->fsc->client;
186e4f7a
YZ		 2043 struct ceph_msg *msg;
2044
38d46409
XL		 2045 doutc(cl, "to mds%d (%s)s seq %lld\n", session->s_mds,
2046 ceph_session_state_name(session->s_state), seq);
fba97e80 2047 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
186e4f7a
YZ		 2048 if (!msg)
2049 return -ENOMEM;
2050 ceph_con_send(&session->s_con, msg);
2051 return 0;
2052}
2053
2054
2f2dc053
SW		 2055/*
2056 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
0dc2570f
SW		 2057 *
2058 * Called under session->s_mutex
2f2dc053
SW		 2059 */
2060static void renewed_caps(struct ceph_mds_client *mdsc,
2061 struct ceph_mds_session *session, int is_renew)
2062{
38d46409 2063 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2064 int was_stale;
2065 int wake = 0;
2066
2067 spin_lock(&session->s_cap_lock);
1ce208a6 2068 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2f2dc053
SW		 2069
2070 session->s_cap_ttl = session->s_renew_requested +
2071 mdsc->mdsmap->m_session_timeout*HZ;
2072
2073 if (was_stale) {
2074 if (time_before(jiffies, session->s_cap_ttl)) {
38d46409
XL		 2075 pr_info_client(cl, "mds%d caps renewed\n",
2076 session->s_mds);
2f2dc053
SW		 2077 wake = 1;
2078 } else {
38d46409
XL		 2079 pr_info_client(cl, "mds%d caps still stale\n",
2080 session->s_mds);
2f2dc053
SW		 2081 }
2082 }
38d46409
XL		 2083 doutc(cl, "mds%d ttl now %lu, was %s, now %s\n", session->s_mds,
2084 session->s_cap_ttl, was_stale ? "stale" : "fresh",
2085 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2f2dc053
SW		 2086 spin_unlock(&session->s_cap_lock);
2087
2088 if (wake)
d2f8bb27 2089 wake_up_session_caps(session, RENEWCAPS);
2f2dc053
SW		 2090}
2091
2092/*
2093 * send a session close request
2094 */
3e699bd8 2095static int request_close_session(struct ceph_mds_session *session)
2f2dc053 2096{
38d46409 2097 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053 2098 struct ceph_msg *msg;
2f2dc053 2099
38d46409
XL		 2100 doutc(cl, "mds%d state %s seq %lld\n", session->s_mds,
2101 ceph_session_state_name(session->s_state), session->s_seq);
fba97e80
XL		 2102 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2103 session->s_seq);
a79832f2
SW		 2104 if (!msg)
2105 return -ENOMEM;
2106 ceph_con_send(&session->s_con, msg);
fcff415c 2107 return 1;
2f2dc053
SW		 2108}
2109
2110/*
2111 * Called with s_mutex held.
2112 */
2113static int __close_session(struct ceph_mds_client *mdsc,
2114 struct ceph_mds_session *session)
2115{
2116 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2117 return 0;
2118 session->s_state = CEPH_MDS_SESSION_CLOSING;
3e699bd8 2119 return request_close_session(session);
2f2dc053
SW		 2120}
2121
040d7860
YZ		 2122static bool drop_negative_children(struct dentry *dentry)
2123{
2124 struct dentry *child;
2125 bool all_negative = true;
2126
2127 if (!d_is_dir(dentry))
2128 goto out;
2129
2130 spin_lock(&dentry->d_lock);
2131 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
2132 if (d_really_is_positive(child)) {
2133 all_negative = false;
2134 break;
2135 }
2136 }
2137 spin_unlock(&dentry->d_lock);
2138
2139 if (all_negative)
2140 shrink_dcache_parent(dentry);
2141out:
2142 return all_negative;
2143}
2144
2f2dc053
SW		 2145/*
2146 * Trim old(er) caps.
2147 *
2148 * Because we can't cache an inode without one or more caps, we do
2149 * this indirectly: if a cap is unused, we prune its aliases, at which
2150 * point the inode will hopefully get dropped to.
2151 *
2152 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2153 * memory pressure from the MDS, though, so it needn't be perfect.
2154 */
aaf67de7 2155static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 2156{
197b7d79 2157 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 2158 struct ceph_client *cl = mdsc->fsc->client;
533a2818 2159 int *remaining = arg;
2f2dc053 2160 struct ceph_inode_info *ci = ceph_inode(inode);
979abfdd 2161 int used, wanted, oissued, mine;
aaf67de7 2162 struct ceph_cap *cap;
2f2dc053 2163
533a2818 2164 if (*remaining <= 0)
2f2dc053
SW		 2165 return -1;
2166
be655596 2167 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 2168 cap = __get_cap_for_mds(ci, mds);
2169 if (!cap) {
2170 spin_unlock(&ci->i_ceph_lock);
2171 return 0;
2172 }
2f2dc053
SW		 2173 mine = cap->issued | cap->implemented;
2174 used = __ceph_caps_used(ci);
979abfdd 2175 wanted = __ceph_caps_file_wanted(ci);
2f2dc053
SW		 2176 oissued = __ceph_caps_issued_other(ci, cap);
2177
38d46409
XL		 2178 doutc(cl, "%p %llx.%llx cap %p mine %s oissued %s used %s wanted %s\n",
2179 inode, ceph_vinop(inode), cap, ceph_cap_string(mine),
2180 ceph_cap_string(oissued), ceph_cap_string(used),
2181 ceph_cap_string(wanted));
979abfdd 2182 if (cap == ci->i_auth_cap) {
622f3e25
YZ		 2183 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2184 !list_empty(&ci->i_cap_snaps))
979abfdd
YZ		 2185 goto out;
2186 if ((used | wanted) & CEPH_CAP_ANY_WR)
2187 goto out;
89aa5930
YZ		 2188 /* Note: it's possible that i_filelock_ref becomes non-zero
2189 * after dropping auth caps. It doesn't hurt because reply
2190 * of lock mds request will re-add auth caps. */
2191 if (atomic_read(&ci->i_filelock_ref) > 0)
2192 goto out;
979abfdd 2193 }
5e804ac4
YZ		 2194 /* The inode has cached pages, but it's no longer used.
2195 * we can safely drop it */
525d15e8
YZ		 2196 if (S_ISREG(inode->i_mode) &&
2197 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
5e804ac4
YZ		 2198 !(oissued & CEPH_CAP_FILE_CACHE)) {
2199 used = 0;
2200 oissued = 0;
2201 }
979abfdd 2202 if ((used | wanted) & ~oissued & mine)
2f2dc053
SW		 2203 goto out; /* we need these caps */
2204
2f2dc053
SW		 2205 if (oissued) {
2206 /* we aren't the only cap.. just remove us */
197b7d79 2207 ceph_remove_cap(mdsc, cap, true);
533a2818 2208 (*remaining)--;
2f2dc053 2209 } else {
040d7860 2210 struct dentry *dentry;
5e804ac4 2211 /* try dropping referring dentries */
be655596 2212 spin_unlock(&ci->i_ceph_lock);
040d7860
YZ		 2213 dentry = d_find_any_alias(inode);
2214 if (dentry && drop_negative_children(dentry)) {
2215 int count;
2216 dput(dentry);
2217 d_prune_aliases(inode);
2218 count = atomic_read(&inode->i_count);
2219 if (count == 1)
533a2818 2220 (*remaining)--;
38d46409
XL		 2221 doutc(cl, "%p %llx.%llx cap %p pruned, count now %d\n",
2222 inode, ceph_vinop(inode), cap, count);
040d7860
YZ		 2223 } else {
2224 dput(dentry);
2225 }
2f2dc053
SW		 2226 return 0;
2227 }
2228
2229out:
be655596 2230 spin_unlock(&ci->i_ceph_lock);
2f2dc053
SW		 2231 return 0;
2232}
2233
2234/*
2235 * Trim session cap count down to some max number.
2236 */
e30ee581
ZZ		 2237int ceph_trim_caps(struct ceph_mds_client *mdsc,
2238 struct ceph_mds_session *session,
2239 int max_caps)
2f2dc053 2240{
38d46409 2241 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2242 int trim_caps = session->s_nr_caps - max_caps;
2243
38d46409
XL		 2244 doutc(cl, "mds%d start: %d / %d, trim %d\n", session->s_mds,
2245 session->s_nr_caps, max_caps, trim_caps);
2f2dc053 2246 if (trim_caps > 0) {
533a2818
JL		 2247 int remaining = trim_caps;
2248
2249 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
38d46409
XL		 2250 doutc(cl, "mds%d done: %d / %d, trimmed %d\n",
2251 session->s_mds, session->s_nr_caps, max_caps,
2252 trim_caps - remaining);
2f2dc053 2253 }
a56371d9 2254
e3ec8d68 2255 ceph_flush_cap_releases(mdsc, session);
2f2dc053
SW		 2256 return 0;
2257}
2258
8310b089
YZ		 2259static int check_caps_flush(struct ceph_mds_client *mdsc,
2260 u64 want_flush_tid)
2261{
38d46409 2262 struct ceph_client *cl = mdsc->fsc->client;
8310b089
YZ		 2263 int ret = 1;
2264
2265 spin_lock(&mdsc->cap_dirty_lock);
e4500b5e
YZ		 2266 if (!list_empty(&mdsc->cap_flush_list)) {
2267 struct ceph_cap_flush *cf =
2268 list_first_entry(&mdsc->cap_flush_list,
2269 struct ceph_cap_flush, g_list);
2270 if (cf->tid <= want_flush_tid) {
38d46409
XL		 2271 doutc(cl, "still flushing tid %llu <= %llu\n",
2272 cf->tid, want_flush_tid);
e4500b5e
YZ		 2273 ret = 0;
2274 }
8310b089
YZ		 2275 }
2276 spin_unlock(&mdsc->cap_dirty_lock);
2277 return ret;
d3383a8e
YZ		 2278}
2279
2f2dc053
SW		 2280/*
2281 * flush all dirty inode data to disk.
2282 *
8310b089 2283 * returns true if we've flushed through want_flush_tid
2f2dc053 2284 */
affbc19a 2285static void wait_caps_flush(struct ceph_mds_client *mdsc,
0e294387 2286 u64 want_flush_tid)
2f2dc053 2287{
38d46409
XL		 2288 struct ceph_client *cl = mdsc->fsc->client;
2289
2290 doutc(cl, "want %llu\n", want_flush_tid);
8310b089
YZ		 2291
2292 wait_event(mdsc->cap_flushing_wq,
2293 check_caps_flush(mdsc, want_flush_tid));
2294
38d46409 2295 doutc(cl, "ok, flushed thru %llu\n", want_flush_tid);
2f2dc053
SW		 2296}
2297
2298/*
2299 * called under s_mutex
2300 */
e3ec8d68
YZ		 2301static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2302 struct ceph_mds_session *session)
2f2dc053 2303{
38d46409 2304 struct ceph_client *cl = mdsc->fsc->client;
745a8e3b
YZ		 2305 struct ceph_msg *msg = NULL;
2306 struct ceph_mds_cap_release *head;
2307 struct ceph_mds_cap_item *item;
92475f05 2308 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
745a8e3b
YZ		 2309 struct ceph_cap *cap;
2310 LIST_HEAD(tmp_list);
2311 int num_cap_releases;
92475f05
JL		 2312 __le32 barrier, *cap_barrier;
2313
2314 down_read(&osdc->lock);
2315 barrier = cpu_to_le32(osdc->epoch_barrier);
2316 up_read(&osdc->lock);
2f2dc053 2317
0f8605f2 2318 spin_lock(&session->s_cap_lock);
745a8e3b
YZ		 2319again:
2320 list_splice_init(&session->s_cap_releases, &tmp_list);
2321 num_cap_releases = session->s_num_cap_releases;
2322 session->s_num_cap_releases = 0;
2f2dc053 2323 spin_unlock(&session->s_cap_lock);
e01a5946 2324
745a8e3b
YZ		 2325 while (!list_empty(&tmp_list)) {
2326 if (!msg) {
2327 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
09cbfeaf 2328 PAGE_SIZE, GFP_NOFS, false);
745a8e3b
YZ		 2329 if (!msg)
2330 goto out_err;
2331 head = msg->front.iov_base;
2332 head->num = cpu_to_le32(0);
2333 msg->front.iov_len = sizeof(*head);
92475f05
JL		 2334
2335 msg->hdr.version = cpu_to_le16(2);
2336 msg->hdr.compat_version = cpu_to_le16(1);
745a8e3b 2337 }
92475f05 2338
745a8e3b
YZ		 2339 cap = list_first_entry(&tmp_list, struct ceph_cap,
2340 session_caps);
2341 list_del(&cap->session_caps);
2342 num_cap_releases--;
e01a5946 2343
00bd8edb 2344 head = msg->front.iov_base;
4198aba4
JL		 2345 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2346 &head->num);
745a8e3b
YZ		 2347 item = msg->front.iov_base + msg->front.iov_len;
2348 item->ino = cpu_to_le64(cap->cap_ino);
2349 item->cap_id = cpu_to_le64(cap->cap_id);
2350 item->migrate_seq = cpu_to_le32(cap->mseq);
2351 item->seq = cpu_to_le32(cap->issue_seq);
2352 msg->front.iov_len += sizeof(*item);
2353
2354 ceph_put_cap(mdsc, cap);
2355
2356 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
92475f05
JL		 2357 // Append cap_barrier field
2358 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2359 *cap_barrier = barrier;
2360 msg->front.iov_len += sizeof(*cap_barrier);
2361
745a8e3b 2362 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2363 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b
YZ		 2364 ceph_con_send(&session->s_con, msg);
2365 msg = NULL;
2366 }
00bd8edb 2367 }
e01a5946 2368
745a8e3b 2369 BUG_ON(num_cap_releases != 0);
e01a5946 2370
745a8e3b
YZ		 2371 spin_lock(&session->s_cap_lock);
2372 if (!list_empty(&session->s_cap_releases))
2373 goto again;
2374 spin_unlock(&session->s_cap_lock);
2375
2376 if (msg) {
92475f05
JL		 2377 // Append cap_barrier field
2378 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2379 *cap_barrier = barrier;
2380 msg->front.iov_len += sizeof(*cap_barrier);
2381
745a8e3b 2382 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
38d46409 2383 doutc(cl, "mds%d %p\n", session->s_mds, msg);
745a8e3b 2384 ceph_con_send(&session->s_con, msg);
e01a5946 2385 }
745a8e3b
YZ		 2386 return;
2387out_err:
38d46409
XL		 2388 pr_err_client(cl, "mds%d, failed to allocate message\n",
2389 session->s_mds);
745a8e3b
YZ		 2390 spin_lock(&session->s_cap_lock);
2391 list_splice(&tmp_list, &session->s_cap_releases);
2392 session->s_num_cap_releases += num_cap_releases;
2393 spin_unlock(&session->s_cap_lock);
e01a5946
SW		 2394}
2395
e3ec8d68
YZ		 2396static void ceph_cap_release_work(struct work_struct *work)
2397{
2398 struct ceph_mds_session *session =
2399 container_of(work, struct ceph_mds_session, s_cap_release_work);
2400
2401 mutex_lock(&session->s_mutex);
2402 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2403 session->s_state == CEPH_MDS_SESSION_HUNG)
2404 ceph_send_cap_releases(session->s_mdsc, session);
2405 mutex_unlock(&session->s_mutex);
2406 ceph_put_mds_session(session);
2407}
2408
2409void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2410 struct ceph_mds_session *session)
2411{
38d46409 2412 struct ceph_client *cl = mdsc->fsc->client;
e3ec8d68
YZ		 2413 if (mdsc->stopping)
2414 return;
2415
5b3248c6 2416 ceph_get_mds_session(session);
e3ec8d68
YZ		 2417 if (queue_work(mdsc->fsc->cap_wq,
2418 &session->s_cap_release_work)) {
38d46409 2419 doutc(cl, "cap release work queued\n");
e3ec8d68
YZ		 2420 } else {
2421 ceph_put_mds_session(session);
38d46409 2422 doutc(cl, "failed to queue cap release work\n");
e3ec8d68
YZ		 2423 }
2424}
2425
2426/*
2427 * caller holds session->s_cap_lock
2428 */
2429void __ceph_queue_cap_release(struct ceph_mds_session *session,
2430 struct ceph_cap *cap)
2431{
2432 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2433 session->s_num_cap_releases++;
2434
2435 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2436 ceph_flush_cap_releases(session->s_mdsc, session);
2437}
2438
37c4efc1
YZ		 2439static void ceph_cap_reclaim_work(struct work_struct *work)
2440{
2441 struct ceph_mds_client *mdsc =
2442 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2443 int ret = ceph_trim_dentries(mdsc);
2444 if (ret == -EAGAIN)
2445 ceph_queue_cap_reclaim_work(mdsc);
2446}
2447
2448void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2449{
38d46409 2450 struct ceph_client *cl = mdsc->fsc->client;
37c4efc1
YZ		 2451 if (mdsc->stopping)
2452 return;
2453
2454 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
38d46409 2455 doutc(cl, "caps reclaim work queued\n");
37c4efc1 2456 } else {
38d46409 2457 doutc(cl, "failed to queue caps release work\n");
37c4efc1
YZ		 2458 }
2459}
2460
fe33032d
YZ		 2461void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2462{
2463 int val;
2464 if (!nr)
2465 return;
2466 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
bba1560b 2467 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
fe33032d
YZ		 2468 atomic_set(&mdsc->cap_reclaim_pending, 0);
2469 ceph_queue_cap_reclaim_work(mdsc);
2470 }
2471}
2472
2f2dc053
SW		 2473/*
2474 * requests
2475 */
2476
54008399
YZ		 2477int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2478 struct inode *dir)
2479{
2480 struct ceph_inode_info *ci = ceph_inode(dir);
2481 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2482 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2a5beea3 2483 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
ad8c28a9
JL		 2484 unsigned int num_entries;
2485 int order;
54008399
YZ		 2486
2487 spin_lock(&ci->i_ceph_lock);
2488 num_entries = ci->i_files + ci->i_subdirs;
2489 spin_unlock(&ci->i_ceph_lock);
ad8c28a9 2490 num_entries = max(num_entries, 1U);
54008399
YZ		 2491 num_entries = min(num_entries, opt->max_readdir);
2492
2493 order = get_order(size * num_entries);
2494 while (order >= 0) {
2a5beea3 2495 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2941bf53
XL		 2496 __GFP_NOWARN |
2497 __GFP_ZERO,
2a5beea3
YZ		 2498 order);
2499 if (rinfo->dir_entries)
54008399
YZ		 2500 break;
2501 order--;
2502 }
2a5beea3 2503 if (!rinfo->dir_entries)
54008399
YZ		 2504 return -ENOMEM;
2505
2506 num_entries = (PAGE_SIZE << order) / size;
2507 num_entries = min(num_entries, opt->max_readdir);
2508
2509 rinfo->dir_buf_size = PAGE_SIZE << order;
2510 req->r_num_caps = num_entries + 1;
2511 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2512 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2513 return 0;
2514}
2515
2f2dc053
SW		 2516/*
2517 * Create an mds request.
2518 */
2519struct ceph_mds_request *
2520ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2521{
058daab7 2522 struct ceph_mds_request *req;
2f2dc053 2523
058daab7 2524 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2f2dc053
SW		 2525 if (!req)
2526 return ERR_PTR(-ENOMEM);
2527
b4556396 2528 mutex_init(&req->r_fill_mutex);
37151668 2529 req->r_mdsc = mdsc;
2f2dc053 2530 req->r_started = jiffies;
70c94820 2531 req->r_start_latency = ktime_get();
2f2dc053
SW		 2532 req->r_resend_mds = -1;
2533 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
68cd5b4b 2534 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2f2dc053 2535 req->r_fmode = -1;
6eb06c46 2536 req->r_feature_needed = -1;
153c8e6b 2537 kref_init(&req->r_kref);
fcd00b68 2538 RB_CLEAR_NODE(&req->r_node);
2f2dc053
SW		 2539 INIT_LIST_HEAD(&req->r_wait);
2540 init_completion(&req->r_completion);
2541 init_completion(&req->r_safe_completion);
2542 INIT_LIST_HEAD(&req->r_unsafe_item);
2543
668c9a61 2544 ktime_get_coarse_real_ts64(&req->r_stamp);
b8e69066 2545
2f2dc053
SW		 2546 req->r_op = op;
2547 req->r_direct_mode = mode;
2548 return req;
2549}
2550
2551/*
44ca18f2 2552 * return oldest (lowest) request, tid in request tree, 0 if none.
2f2dc053
SW		 2553 *
2554 * called under mdsc->mutex.
2555 */
44ca18f2
SW		 2556static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2557{
2558 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2559 return NULL;
2560 return rb_entry(rb_first(&mdsc->request_tree),
2561 struct ceph_mds_request, r_node);
2562}
2563
e8a7b8b1 2564static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2f2dc053 2565{
e8a7b8b1 2566 return mdsc->oldest_tid;
2f2dc053
SW		 2567}
2568
24865e75
JL		 2569#if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2570static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2571{
2572 struct inode *dir = req->r_parent;
2573 struct dentry *dentry = req->r_dentry;
2574 u8 *cryptbuf = NULL;
2575 u32 len = 0;
2576 int ret = 0;
2577
2578 /* only encode if we have parent and dentry */
2579 if (!dir || !dentry)
2580 goto success;
2581
2582 /* No-op unless this is encrypted */
2583 if (!IS_ENCRYPTED(dir))
2584 goto success;
2585
14e034a6
LH		 2586 ret = ceph_fscrypt_prepare_readdir(dir);
2587 if (ret < 0)
24865e75
JL		 2588 return ERR_PTR(ret);
2589
2590 /* No key? Just ignore it. */
2591 if (!fscrypt_has_encryption_key(dir))
2592 goto success;
2593
2594 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX,
2595 &len)) {
2596 WARN_ON_ONCE(1);
2597 return ERR_PTR(-ENAMETOOLONG);
2598 }
2599
2600 /* No need to append altname if name is short enough */
2601 if (len <= CEPH_NOHASH_NAME_MAX) {
2602 len = 0;
2603 goto success;
2604 }
2605
2606 cryptbuf = kmalloc(len, GFP_KERNEL);
2607 if (!cryptbuf)
2608 return ERR_PTR(-ENOMEM);
2609
2610 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len);
2611 if (ret) {
2612 kfree(cryptbuf);
2613 return ERR_PTR(ret);
2614 }
2615success:
2616 *plen = len;
2617 return cryptbuf;
2618}
2619#else
2620static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2621{
2622 *plen = 0;
2623 return NULL;
2624}
2625#endif
2626
3fd945a7
JL		 2627/**
2628 * ceph_mdsc_build_path - build a path string to a given dentry
197b7d79 2629 * @mdsc: mds client
3fd945a7
JL		 2630 * @dentry: dentry to which path should be built
2631 * @plen: returned length of string
2632 * @pbase: returned base inode number
2633 * @for_wire: is this path going to be sent to the MDS?
2634 *
2635 * Build a string that represents the path to the dentry. This is mostly called
2636 * for two different purposes:
2637 *
2638 * 1) we need to build a path string to send to the MDS (for_wire == true)
2639 * 2) we need a path string for local presentation (e.g. debugfs)
2640 * (for_wire == false)
2f2dc053 2641 *
3fd945a7
JL		 2642 * The path is built in reverse, starting with the dentry. Walk back up toward
2643 * the root, building the path until the first non-snapped inode is reached
2644 * (for_wire) or the root inode is reached (!for_wire).
2f2dc053
SW		 2645 *
2646 * Encode hidden .snap dirs as a double /, i.e.
2647 * foo/.snap/bar -> foo//bar
2648 */
197b7d79
XL		 2649char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2650 int *plen, u64 *pbase, int for_wire)
2f2dc053 2651{
38d46409 2652 struct ceph_client *cl = mdsc->fsc->client;
4c793d4c
JL		 2653 struct dentry *cur;
2654 struct inode *inode;
2f2dc053 2655 char *path;
f77f21bb 2656 int pos;
1b71fe2e 2657 unsigned seq;
69a10fb3 2658 u64 base;
2f2dc053 2659
d37b1d99 2660 if (!dentry)
2f2dc053
SW		 2661 return ERR_PTR(-EINVAL);
2662
f77f21bb 2663 path = __getname();
d37b1d99 2664 if (!path)
2f2dc053 2665 return ERR_PTR(-ENOMEM);
f77f21bb
JL		 2666retry:
2667 pos = PATH_MAX - 1;
2668 path[pos] = '\0';
2669
2670 seq = read_seqbegin(&rename_lock);
4c793d4c 2671 cur = dget(dentry);
f77f21bb 2672 for (;;) {
3fd945a7 2673 struct dentry *parent;
2f2dc053 2674
4c793d4c
JL		 2675 spin_lock(&cur->d_lock);
2676 inode = d_inode(cur);
2f2dc053 2677 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
38d46409 2678 doutc(cl, "path+%d: %p SNAPDIR\n", pos, cur);
3fd945a7
JL		 2679 spin_unlock(&cur->d_lock);
2680 parent = dget_parent(cur);
2681 } else if (for_wire && inode && dentry != cur &&
2f2dc053 2682 ceph_snap(inode) == CEPH_NOSNAP) {
4c793d4c 2683 spin_unlock(&cur->d_lock);
d6b8bd67 2684 pos++; /* get rid of any prepended '/' */
2f2dc053 2685 break;
3fd945a7 2686 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
4c793d4c 2687 pos -= cur->d_name.len;
1b71fe2e 2688 if (pos < 0) {
4c793d4c 2689 spin_unlock(&cur->d_lock);
2f2dc053 2690 break;
1b71fe2e 2691 }
4c793d4c 2692 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
3fd945a7
JL		 2693 spin_unlock(&cur->d_lock);
2694 parent = dget_parent(cur);
2695 } else {
2696 int len, ret;
2697 char buf[NAME_MAX];
2698
2699 /*
2700 * Proactively copy name into buf, in case we need to
2701 * present it as-is.
2702 */
2703 memcpy(buf, cur->d_name.name, cur->d_name.len);
2704 len = cur->d_name.len;
2705 spin_unlock(&cur->d_lock);
2706 parent = dget_parent(cur);
2707
14e034a6 2708 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
3fd945a7
JL		 2709 if (ret < 0) {
2710 dput(parent);
2711 dput(cur);
2712 return ERR_PTR(ret);
2713 }
2714
2715 if (fscrypt_has_encryption_key(d_inode(parent))) {
2716 len = ceph_encode_encrypted_fname(d_inode(parent),
2717 cur, buf);
2718 if (len < 0) {
2719 dput(parent);
2720 dput(cur);
2721 return ERR_PTR(len);
2722 }
2723 }
2724 pos -= len;
2725 if (pos < 0) {
2726 dput(parent);
2727 break;
2728 }
2729 memcpy(path + pos, buf, len);
2f2dc053 2730 }
3fd945a7
JL		 2731 dput(cur);
2732 cur = parent;
f77f21bb
JL		 2733
2734 /* Are we at the root? */
4c793d4c 2735 if (IS_ROOT(cur))
f77f21bb
JL		 2736 break;
2737
2738 /* Are we out of buffer? */
2739 if (--pos < 0)
2740 break;
2741
2742 path[pos] = '/';
2f2dc053 2743 }
4c793d4c
JL		 2744 inode = d_inode(cur);
2745 base = inode ? ceph_ino(inode) : 0;
2746 dput(cur);
f5946bcc
JL		 2747
2748 if (read_seqretry(&rename_lock, seq))
2749 goto retry;
2750
2751 if (pos < 0) {
2752 /*
2753 * A rename didn't occur, but somehow we didn't end up where
2754 * we thought we would. Throw a warning and try again.
2755 */
38d46409
XL		 2756 pr_warn_client(cl, "did not end path lookup where expected (pos = %d)\n",
2757 pos);
2f2dc053
SW		 2758 goto retry;
2759 }
2760
69a10fb3 2761 *pbase = base;
f77f21bb 2762 *plen = PATH_MAX - 1 - pos;
38d46409
XL		 2763 doutc(cl, "on %p %d built %llx '%.*s'\n", dentry, d_count(dentry),
2764 base, *plen, path + pos);
f77f21bb 2765 return path + pos;
2f2dc053
SW		 2766}
2767
197b7d79
XL		 2768static int build_dentry_path(struct ceph_mds_client *mdsc, struct dentry *dentry,
2769 struct inode *dir, const char **ppath, int *ppathlen,
2770 u64 *pino, bool *pfreepath, bool parent_locked)
2f2dc053
SW		 2771{
2772 char *path;
2773
c6b0b656 2774 rcu_read_lock();
fd36a717
JL		 2775 if (!dir)
2776 dir = d_inode_rcu(dentry->d_parent);
3fd945a7
JL		 2777 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2778 !IS_ENCRYPTED(dir)) {
c6b0b656
JL		 2779 *pino = ceph_ino(dir);
2780 rcu_read_unlock();
964fff74
JL		 2781 *ppath = dentry->d_name.name;
2782 *ppathlen = dentry->d_name.len;
2f2dc053
SW		 2783 return 0;
2784 }
c6b0b656 2785 rcu_read_unlock();
197b7d79 2786 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2787 if (IS_ERR(path))
2788 return PTR_ERR(path);
2789 *ppath = path;
1bcb3440 2790 *pfreepath = true;
2f2dc053
SW		 2791 return 0;
2792}
2793
2794static int build_inode_path(struct inode *inode,
2795 const char **ppath, int *ppathlen, u64 *pino,
1bcb3440 2796 bool *pfreepath)
2f2dc053 2797{
197b7d79 2798 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
2f2dc053
SW		 2799 struct dentry *dentry;
2800 char *path;
2801
2802 if (ceph_snap(inode) == CEPH_NOSNAP) {
2803 *pino = ceph_ino(inode);
2804 *ppathlen = 0;
2805 return 0;
2806 }
2807 dentry = d_find_alias(inode);
197b7d79 2808 path = ceph_mdsc_build_path(mdsc, dentry, ppathlen, pino, 1);
2f2dc053
SW		 2809 dput(dentry);
2810 if (IS_ERR(path))
2811 return PTR_ERR(path);
2812 *ppath = path;
1bcb3440 2813 *pfreepath = true;
2f2dc053
SW		 2814 return 0;
2815}
2816
2817/*
2818 * request arguments may be specified via an inode *, a dentry *, or
2819 * an explicit ino+path.
2820 */
197b7d79
XL		 2821static int set_request_path_attr(struct ceph_mds_client *mdsc, struct inode *rinode,
2822 struct dentry *rdentry, struct inode *rdiri,
2823 const char *rpath, u64 rino, const char **ppath,
2824 int *pathlen, u64 *ino, bool *freepath,
2825 bool parent_locked)
2f2dc053 2826{
38d46409 2827 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 2828 int r = 0;
2829
2830 if (rinode) {
2831 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
38d46409
XL		 2832 doutc(cl, " inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2833 ceph_snap(rinode));
2f2dc053 2834 } else if (rdentry) {
197b7d79 2835 r = build_dentry_path(mdsc, rdentry, rdiri, ppath, pathlen, ino,
1bcb3440 2836 freepath, parent_locked);
38d46409 2837 doutc(cl, " dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen, *ppath);
795858db 2838 } else if (rpath || rino) {
2f2dc053
SW		 2839 *ino = rino;
2840 *ppath = rpath;
b000056a 2841 *pathlen = rpath ? strlen(rpath) : 0;
38d46409 2842 doutc(cl, " path %.*s\n", *pathlen, rpath);
2f2dc053
SW		 2843 }
2844
2845 return r;
2846}
2847
2d332d5b
JL		 2848static void encode_mclientrequest_tail(void **p,
2849 const struct ceph_mds_request *req)
60267ba3
ID		 2850{
2851 struct ceph_timespec ts;
2852 int i;
2853
2854 ceph_encode_timespec64(&ts, &req->r_stamp);
2855 ceph_encode_copy(p, &ts, sizeof(ts));
2856
24865e75 2857 /* v4: gid_list */
60267ba3
ID		 2858 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2859 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2860 ceph_encode_64(p, from_kgid(&init_user_ns,
2861 req->r_cred->group_info->gid[i]));
2d332d5b 2862
24865e75
JL		 2863 /* v5: altname */
2864 ceph_encode_32(p, req->r_altname_len);
2865 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2d332d5b
JL		 2866
2867 /* v6: fscrypt_auth and fscrypt_file */
2868 if (req->r_fscrypt_auth) {
2869 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2870
2871 ceph_encode_32(p, authlen);
2872 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2873 } else {
2874 ceph_encode_32(p, 0);
2875 }
16be62fc
JL		 2876 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2877 ceph_encode_32(p, sizeof(__le64));
2878 ceph_encode_64(p, req->r_fscrypt_file);
2879 } else {
2880 ceph_encode_32(p, 0);
2881 }
60267ba3
ID		 2882}
2883
5ccd8530
CB		 2884static inline u16 mds_supported_head_version(struct ceph_mds_session *session)
2885{
2886 if (!test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD, &session->s_features))
2887 return 1;
2888
2889 if (!test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features))
2890 return 2;
2891
2892 return CEPH_MDS_REQUEST_HEAD_VERSION;
2893}
2894
ce0d5bd3
XL		 2895static struct ceph_mds_request_head_legacy *
2896find_legacy_request_head(void *p, u64 features)
2897{
2898 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
2899 struct ceph_mds_request_head_old *ohead;
2900
2901 if (legacy)
2902 return (struct ceph_mds_request_head_legacy *)p;
2903 ohead = (struct ceph_mds_request_head_old *)p;
2904 return (struct ceph_mds_request_head_legacy *)&ohead->oldest_client_tid;
2905}
2906
2f2dc053
SW		 2907/*
2908 * called under mdsc->mutex
2909 */
4f1ddb1e 2910static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2f2dc053 2911 struct ceph_mds_request *req,
4f1ddb1e 2912 bool drop_cap_releases)
2f2dc053 2913{
4f1ddb1e
JL		 2914 int mds = session->s_mds;
2915 struct ceph_mds_client *mdsc = session->s_mdsc;
5ccd8530 2916 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 2917 struct ceph_msg *msg;
ce0d5bd3 2918 struct ceph_mds_request_head_legacy *lhead;
2f2dc053
SW		 2919 const char *path1 = NULL;
2920 const char *path2 = NULL;
2921 u64 ino1 = 0, ino2 = 0;
2922 int pathlen1 = 0, pathlen2 = 0;
1bcb3440 2923 bool freepath1 = false, freepath2 = false;
a5ffd7b6 2924 struct dentry *old_dentry = NULL;
60267ba3 2925 int len;
2f2dc053
SW		 2926 u16 releases;
2927 void *p, *end;
2928 int ret;
4f1ddb1e 2929 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
5ccd8530 2930 u16 request_head_version = mds_supported_head_version(session);
673478b6
AM		 2931 kuid_t caller_fsuid = req->r_cred->fsuid;
2932 kgid_t caller_fsgid = req->r_cred->fsgid;
2f2dc053 2933
197b7d79 2934 ret = set_request_path_attr(mdsc, req->r_inode, req->r_dentry,
3dd69aab 2935 req->r_parent, req->r_path1, req->r_ino1.ino,
1bcb3440
JL		 2936 &path1, &pathlen1, &ino1, &freepath1,
2937 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2938 &req->r_req_flags));
2f2dc053
SW		 2939 if (ret < 0) {
2940 msg = ERR_PTR(ret);
2941 goto out;
2942 }
2943
1bcb3440 2944 /* If r_old_dentry is set, then assume that its parent is locked */
a5ffd7b6
XL		 2945 if (req->r_old_dentry &&
2946 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
2947 old_dentry = req->r_old_dentry;
197b7d79 2948 ret = set_request_path_attr(mdsc, NULL, old_dentry,
fd36a717 2949 req->r_old_dentry_dir,
2f2dc053 2950 req->r_path2, req->r_ino2.ino,
1bcb3440 2951 &path2, &pathlen2, &ino2, &freepath2, true);
2f2dc053
SW		 2952 if (ret < 0) {
2953 msg = ERR_PTR(ret);
2954 goto out_free1;
2955 }
2956
24865e75
JL		 2957 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
2958 if (IS_ERR(req->r_altname)) {
2959 msg = ERR_CAST(req->r_altname);
2960 req->r_altname = NULL;
2961 goto out_free2;
2962 }
2963
ce0d5bd3
XL		 2964 /*
2965 * For old cephs without supporting the 32bit retry/fwd feature
2966 * it will copy the raw memories directly when decoding the
2967 * requests. While new cephs will decode the head depending the
2968 * version member, so we need to make sure it will be compatible
2969 * with them both.
2970 */
2971 if (legacy)
2972 len = sizeof(struct ceph_mds_request_head_legacy);
5ccd8530 2973 else if (request_head_version == 1)
ce0d5bd3 2974 len = sizeof(struct ceph_mds_request_head_old);
5ccd8530
CB		 2975 else if (request_head_version == 2)
2976 len = offsetofend(struct ceph_mds_request_head, ext_num_fwd);
ce0d5bd3
XL		 2977 else
2978 len = sizeof(struct ceph_mds_request_head);
2f2dc053 2979
2d332d5b
JL		 2980 /* filepaths */
2981 len += 2 * (1 + sizeof(u32) + sizeof(u64));
2982 len += pathlen1 + pathlen2;
2983
2984 /* cap releases */
2f2dc053
SW		 2985 len += sizeof(struct ceph_mds_request_release) *
2986 (!!req->r_inode_drop + !!req->r_dentry_drop +
2987 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
4f1ddb1e 2988
2f2dc053 2989 if (req->r_dentry_drop)
c1dfc277 2990 len += pathlen1;
2f2dc053 2991 if (req->r_old_dentry_drop)
c1dfc277 2992 len += pathlen2;
2f2dc053 2993
2d332d5b
JL		 2994 /* MClientRequest tail */
2995
2996 /* req->r_stamp */
2997 len += sizeof(struct ceph_timespec);
2998
2999 /* gid list */
3000 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
3001
3002 /* alternate name */
24865e75 3003 len += sizeof(u32) + req->r_altname_len;
2d332d5b
JL		 3004
3005 /* fscrypt_auth */
3006 len += sizeof(u32); // fscrypt_auth
3007 if (req->r_fscrypt_auth)
3008 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
3009
3010 /* fscrypt_file */
3011 len += sizeof(u32);
16be62fc
JL		 3012 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
3013 len += sizeof(__le64);
2d332d5b 3014
0d9c1ab3 3015 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
a79832f2
SW		 3016 if (!msg) {
3017 msg = ERR_PTR(-ENOMEM);
2f2dc053 3018 goto out_free2;
a79832f2 3019 }
2f2dc053 3020
6df058c0
SW		 3021 msg->hdr.tid = cpu_to_le64(req->r_tid);
3022
ce0d5bd3
XL		 3023 lhead = find_legacy_request_head(msg->front.iov_base,
3024 session->s_con.peer_features);
3025
5ccd8530
CB		 3026 if ((req->r_mnt_idmap != &nop_mnt_idmap) &&
3027 !test_bit(CEPHFS_FEATURE_HAS_OWNER_UIDGID, &session->s_features)) {
3028 WARN_ON_ONCE(!IS_CEPH_MDS_OP_NEWINODE(req->r_op));
3029
673478b6
AM		 3030 if (enable_unsafe_idmap) {
3031 pr_warn_once_client(cl,
3032 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3033 " is not supported by MDS. UID/GID-based restrictions may"
3034 " not work properly.\n");
5ccd8530 3035
673478b6
AM		 3036 caller_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3037 VFSUIDT_INIT(req->r_cred->fsuid));
3038 caller_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3039 VFSGIDT_INIT(req->r_cred->fsgid));
3040 } else {
3041 pr_err_ratelimited_client(cl,
3042 "idmapped mount is used and CEPHFS_FEATURE_HAS_OWNER_UIDGID"
3043 " is not supported by MDS. Fail request with -EIO.\n");
3044
3045 ret = -EIO;
3046 goto out_err;
3047 }
5ccd8530
CB		 3048 }
3049
4f1ddb1e 3050 /*
ce0d5bd3 3051 * The ceph_mds_request_head_legacy didn't contain a version field, and
4f1ddb1e
JL		 3052 * one was added when we moved the message version from 3->4.
3053 */
3054 if (legacy) {
3055 msg->hdr.version = cpu_to_le16(3);
ce0d5bd3 3056 p = msg->front.iov_base + sizeof(*lhead);
5ccd8530 3057 } else if (request_head_version == 1) {
ce0d5bd3
XL		 3058 struct ceph_mds_request_head_old *ohead = msg->front.iov_base;
3059
3060 msg->hdr.version = cpu_to_le16(4);
3061 ohead->version = cpu_to_le16(1);
3062 p = msg->front.iov_base + sizeof(*ohead);
5ccd8530
CB		 3063 } else if (request_head_version == 2) {
3064 struct ceph_mds_request_head *nhead = msg->front.iov_base;
3065
3066 msg->hdr.version = cpu_to_le16(6);
3067 nhead->version = cpu_to_le16(2);
3068
3069 p = msg->front.iov_base + offsetofend(struct ceph_mds_request_head, ext_num_fwd);
4f1ddb1e 3070 } else {
ce0d5bd3 3071 struct ceph_mds_request_head *nhead = msg->front.iov_base;
5ccd8530
CB		 3072 kuid_t owner_fsuid;
3073 kgid_t owner_fsgid;
4f1ddb1e 3074
2d332d5b 3075 msg->hdr.version = cpu_to_le16(6);
ce0d5bd3 3076 nhead->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
5ccd8530
CB		 3077 nhead->struct_len = cpu_to_le32(sizeof(struct ceph_mds_request_head));
3078
3079 if (IS_CEPH_MDS_OP_NEWINODE(req->r_op)) {
3080 owner_fsuid = from_vfsuid(req->r_mnt_idmap, &init_user_ns,
3081 VFSUIDT_INIT(req->r_cred->fsuid));
3082 owner_fsgid = from_vfsgid(req->r_mnt_idmap, &init_user_ns,
3083 VFSGIDT_INIT(req->r_cred->fsgid));
3084 nhead->owner_uid = cpu_to_le32(from_kuid(&init_user_ns, owner_fsuid));
3085 nhead->owner_gid = cpu_to_le32(from_kgid(&init_user_ns, owner_fsgid));
3086 } else {
3087 nhead->owner_uid = cpu_to_le32(-1);
3088 nhead->owner_gid = cpu_to_le32(-1);
3089 }
3090
ce0d5bd3 3091 p = msg->front.iov_base + sizeof(*nhead);
4f1ddb1e
JL		 3092 }
3093
2f2dc053
SW		 3094 end = msg->front.iov_base + msg->front.iov_len;
3095
ce0d5bd3
XL		 3096 lhead->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
3097 lhead->op = cpu_to_le32(req->r_op);
3098 lhead->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
673478b6 3099 caller_fsuid));
ce0d5bd3 3100 lhead->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
673478b6 3101 caller_fsgid));
ce0d5bd3
XL		 3102 lhead->ino = cpu_to_le64(req->r_deleg_ino);
3103 lhead->args = req->r_args;
2f2dc053
SW		 3104
3105 ceph_encode_filepath(&p, end, ino1, path1);
3106 ceph_encode_filepath(&p, end, ino2, path2);
3107
e979cf50
SW		 3108 /* make note of release offset, in case we need to replay */
3109 req->r_request_release_offset = p - msg->front.iov_base;
3110
2f2dc053
SW		 3111 /* cap releases */
3112 releases = 0;
3113 if (req->r_inode_drop)
3114 releases += ceph_encode_inode_release(&p,
2b0143b5 3115 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
719a2514
YZ		 3116 mds, req->r_inode_drop, req->r_inode_unless,
3117 req->r_op == CEPH_MDS_OP_READDIR);
3fd945a7
JL		 3118 if (req->r_dentry_drop) {
3119 ret = ceph_encode_dentry_release(&p, req->r_dentry,
3dd69aab 3120 req->r_parent, mds, req->r_dentry_drop,
ca6c8ae0 3121 req->r_dentry_unless);
3fd945a7
JL		 3122 if (ret < 0)
3123 goto out_err;
3124 releases += ret;
3125 }
3126 if (req->r_old_dentry_drop) {
3127 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
ca6c8ae0
JL		 3128 req->r_old_dentry_dir, mds,
3129 req->r_old_dentry_drop,
3130 req->r_old_dentry_unless);
3fd945a7
JL		 3131 if (ret < 0)
3132 goto out_err;
3133 releases += ret;
3134 }
2f2dc053
SW		 3135 if (req->r_old_inode_drop)
3136 releases += ceph_encode_inode_release(&p,
2b0143b5 3137 d_inode(req->r_old_dentry),
2f2dc053 3138 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
6e6f0923
YZ		 3139
3140 if (drop_cap_releases) {
3141 releases = 0;
3142 p = msg->front.iov_base + req->r_request_release_offset;
3143 }
3144
ce0d5bd3 3145 lhead->num_releases = cpu_to_le16(releases);
2f2dc053 3146
2d332d5b 3147 encode_mclientrequest_tail(&p, req);
4f1ddb1e 3148
b682c6d4
XL		 3149 if (WARN_ON_ONCE(p > end)) {
3150 ceph_msg_put(msg);
3151 msg = ERR_PTR(-ERANGE);
3152 goto out_free2;
3153 }
3154
2f2dc053
SW		 3155 msg->front.iov_len = p - msg->front.iov_base;
3156 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3157
25e6bae3
YZ		 3158 if (req->r_pagelist) {
3159 struct ceph_pagelist *pagelist = req->r_pagelist;
25e6bae3
YZ		 3160 ceph_msg_data_add_pagelist(msg, pagelist);
3161 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3162 } else {
3163 msg->hdr.data_len = 0;
ebf18f47 3164 }
02afca6c 3165
2f2dc053
SW		 3166 msg->hdr.data_off = cpu_to_le16(0);
3167
3168out_free2:
3169 if (freepath2)
f77f21bb 3170 ceph_mdsc_free_path((char *)path2, pathlen2);
2f2dc053
SW		 3171out_free1:
3172 if (freepath1)
f77f21bb 3173 ceph_mdsc_free_path((char *)path1, pathlen1);
2f2dc053
SW		 3174out:
3175 return msg;
3fd945a7
JL		 3176out_err:
3177 ceph_msg_put(msg);
3178 msg = ERR_PTR(ret);
3179 goto out_free2;
2f2dc053
SW		 3180}
3181
3182/*
3183 * called under mdsc->mutex if error, under no mutex if
3184 * success.
3185 */
3186static void complete_request(struct ceph_mds_client *mdsc,
3187 struct ceph_mds_request *req)
3188{
70c94820
XL		 3189 req->r_end_latency = ktime_get();
3190
2f2dc053
SW		 3191 if (req->r_callback)
3192 req->r_callback(mdsc, req);
111c7081 3193 complete_all(&req->r_completion);
2f2dc053
SW		 3194}
3195
3196/*
3197 * called under mdsc->mutex
3198 */
396bd62c 3199static int __prepare_send_request(struct ceph_mds_session *session,
2f2dc053 3200 struct ceph_mds_request *req,
396bd62c 3201 bool drop_cap_releases)
2f2dc053 3202{
396bd62c
JL		 3203 int mds = session->s_mds;
3204 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3205 struct ceph_client *cl = mdsc->fsc->client;
ce0d5bd3
XL		 3206 struct ceph_mds_request_head_legacy *lhead;
3207 struct ceph_mds_request_head *nhead;
2f2dc053 3208 struct ceph_msg *msg;
ce0d5bd3
XL		 3209 int flags = 0, old_max_retry;
3210 bool old_version = !test_bit(CEPHFS_FEATURE_32BITS_RETRY_FWD,
3211 &session->s_features);
546a5d61
XL		 3212
3213 /*
ce0d5bd3
XL		 3214 * Avoid inifinite retrying after overflow. The client will
3215 * increase the retry count and if the MDS is old version,
3216 * so we limit to retry at most 256 times.
546a5d61 3217 */
ce0d5bd3
XL		 3218 if (req->r_attempts) {
3219 old_max_retry = sizeof_field(struct ceph_mds_request_head_old,
3220 num_retry);
3221 old_max_retry = 1 << (old_max_retry * BITS_PER_BYTE);
3222 if ((old_version && req->r_attempts >= old_max_retry) ||
3223 ((uint32_t)req->r_attempts >= U32_MAX)) {
38d46409
XL		 3224 pr_warn_ratelimited_client(cl, "request tid %llu seq overflow\n",
3225 req->r_tid);
ce0d5bd3
XL		 3226 return -EMULTIHOP;
3227 }
546a5d61 3228 }
2f2dc053 3229
2f2dc053 3230 req->r_attempts++;
e55b71f8
GF		 3231 if (req->r_inode) {
3232 struct ceph_cap *cap =
3233 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3234
3235 if (cap)
3236 req->r_sent_on_mseq = cap->mseq;
3237 else
3238 req->r_sent_on_mseq = -1;
3239 }
38d46409
XL		 3240 doutc(cl, "%p tid %lld %s (attempt %d)\n", req, req->r_tid,
3241 ceph_mds_op_name(req->r_op), req->r_attempts);
2f2dc053 3242
bc2de10d 3243 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
c5c9a0bf 3244 void *p;
4f1ddb1e 3245
01a92f17
SW		 3246 /*
3247 * Replay. Do not regenerate message (and rebuild
3248 * paths, etc.); just use the original message.
3249 * Rebuilding paths will break for renames because
3250 * d_move mangles the src name.
3251 */
3252 msg = req->r_request;
ce0d5bd3
XL		 3253 lhead = find_legacy_request_head(msg->front.iov_base,
3254 session->s_con.peer_features);
01a92f17 3255
ce0d5bd3 3256 flags = le32_to_cpu(lhead->flags);
01a92f17 3257 flags |= CEPH_MDS_FLAG_REPLAY;
ce0d5bd3 3258 lhead->flags = cpu_to_le32(flags);
01a92f17
SW		 3259
3260 if (req->r_target_inode)
ce0d5bd3 3261 lhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
01a92f17 3262
ce0d5bd3
XL		 3263 lhead->num_retry = req->r_attempts - 1;
3264 if (!old_version) {
3265 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3266 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3267 }
e979cf50
SW		 3268
3269 /* remove cap/dentry releases from message */
ce0d5bd3 3270 lhead->num_releases = 0;
c5c9a0bf 3271
c5c9a0bf 3272 p = msg->front.iov_base + req->r_request_release_offset;
2d332d5b 3273 encode_mclientrequest_tail(&p, req);
c5c9a0bf
YZ		 3274
3275 msg->front.iov_len = p - msg->front.iov_base;
3276 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
01a92f17
SW		 3277 return 0;
3278 }
3279
2f2dc053
SW		 3280 if (req->r_request) {
3281 ceph_msg_put(req->r_request);
3282 req->r_request = NULL;
3283 }
4f1ddb1e 3284 msg = create_request_message(session, req, drop_cap_releases);
2f2dc053 3285 if (IS_ERR(msg)) {
e1518c7c 3286 req->r_err = PTR_ERR(msg);
a79832f2 3287 return PTR_ERR(msg);
2f2dc053
SW		 3288 }
3289 req->r_request = msg;
3290
ce0d5bd3
XL		 3291 lhead = find_legacy_request_head(msg->front.iov_base,
3292 session->s_con.peer_features);
3293 lhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
bc2de10d 3294 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2f2dc053 3295 flags |= CEPH_MDS_FLAG_REPLAY;
3bb48b41
JL		 3296 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3297 flags |= CEPH_MDS_FLAG_ASYNC;
3dd69aab 3298 if (req->r_parent)
2f2dc053 3299 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
ce0d5bd3
XL		 3300 lhead->flags = cpu_to_le32(flags);
3301 lhead->num_fwd = req->r_num_fwd;
3302 lhead->num_retry = req->r_attempts - 1;
3303 if (!old_version) {
3304 nhead = (struct ceph_mds_request_head*)msg->front.iov_base;
3305 nhead->ext_num_fwd = cpu_to_le32(req->r_num_fwd);
3306 nhead->ext_num_retry = cpu_to_le32(req->r_attempts - 1);
3307 }
2f2dc053 3308
38d46409 3309 doutc(cl, " r_parent = %p\n", req->r_parent);
2f2dc053
SW		 3310 return 0;
3311}
3312
9cf54563
XL		 3313/*
3314 * called under mdsc->mutex
3315 */
396bd62c 3316static int __send_request(struct ceph_mds_session *session,
9cf54563
XL		 3317 struct ceph_mds_request *req,
3318 bool drop_cap_releases)
3319{
3320 int err;
3321
396bd62c 3322 err = __prepare_send_request(session, req, drop_cap_releases);
9cf54563
XL		 3323 if (!err) {
3324 ceph_msg_get(req->r_request);
3325 ceph_con_send(&session->s_con, req->r_request);
3326 }
3327
3328 return err;
3329}
3330
2f2dc053
SW		 3331/*
3332 * send request, or put it on the appropriate wait list.
3333 */
d5548492 3334static void __do_request(struct ceph_mds_client *mdsc,
2f2dc053
SW		 3335 struct ceph_mds_request *req)
3336{
38d46409 3337 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3338 struct ceph_mds_session *session = NULL;
3339 int mds = -1;
48fec5d0 3340 int err = 0;
c4853e97 3341 bool random;
2f2dc053 3342
bc2de10d
JL		 3343 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3344 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
eb1b8af3 3345 __unregister_request(mdsc, req);
d5548492 3346 return;
eb1b8af3 3347 }
2f2dc053 3348
a68e564a 3349 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
38d46409 3350 doutc(cl, "metadata corrupted\n");
a68e564a
XL		 3351 err = -EIO;
3352 goto finish;
3353 }
2f2dc053
SW		 3354 if (req->r_timeout &&
3355 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
38d46409 3356 doutc(cl, "timed out\n");
8ccf7fcc 3357 err = -ETIMEDOUT;
2f2dc053
SW		 3358 goto finish;
3359 }
52953d55 3360 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
38d46409 3361 doutc(cl, "forced umount\n");
48fec5d0
YZ		 3362 err = -EIO;
3363 goto finish;
3364 }
52953d55 3365 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
e9e427f0
YZ		 3366 if (mdsc->mdsmap_err) {
3367 err = mdsc->mdsmap_err;
38d46409 3368 doutc(cl, "mdsmap err %d\n", err);
e9e427f0
YZ		 3369 goto finish;
3370 }
cc8e8342 3371 if (mdsc->mdsmap->m_epoch == 0) {
38d46409 3372 doutc(cl, "no mdsmap, waiting for map\n");
cc8e8342 3373 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3374 return;
cc8e8342 3375 }
e9e427f0
YZ		 3376 if (!(mdsc->fsc->mount_options->flags &
3377 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3378 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
97820058 3379 err = -EHOSTUNREACH;
e9e427f0
YZ		 3380 goto finish;
3381 }
3382 }
2f2dc053 3383
dc69e2e9
SW		 3384 put_request_session(req);
3385
c4853e97 3386 mds = __choose_mds(mdsc, req, &random);
2f2dc053
SW		 3387 if (mds < 0 ||
3388 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3bb48b41
JL		 3389 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3390 err = -EJUKEBOX;
3391 goto finish;
3392 }
38d46409 3393 doutc(cl, "no mds or not active, waiting for map\n");
2f2dc053 3394 list_add(&req->r_wait, &mdsc->waiting_for_map);
d5548492 3395 return;
2f2dc053
SW		 3396 }
3397
3398 /* get, open session */
3399 session = __ceph_lookup_mds_session(mdsc, mds);
9c423956 3400 if (!session) {
2f2dc053 3401 session = register_session(mdsc, mds);
9c423956
SW		 3402 if (IS_ERR(session)) {
3403 err = PTR_ERR(session);
3404 goto finish;
3405 }
3406 }
5b3248c6 3407 req->r_session = ceph_get_mds_session(session);
dc69e2e9 3408
38d46409
XL		 3409 doutc(cl, "mds%d session %p state %s\n", mds, session,
3410 ceph_session_state_name(session->s_state));
6eb06c46
XL		 3411
3412 /*
3413 * The old ceph will crash the MDSs when see unknown OPs
3414 */
3415 if (req->r_feature_needed > 0 &&
3416 !test_bit(req->r_feature_needed, &session->s_features)) {
3417 err = -EOPNOTSUPP;
3418 goto out_session;
3419 }
3420
2f2dc053
SW		 3421 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3422 session->s_state != CEPH_MDS_SESSION_HUNG) {
3bb48b41
JL		 3423 /*
3424 * We cannot queue async requests since the caps and delegated
3425 * inodes are bound to the session. Just return -EJUKEBOX and
3426 * let the caller retry a sync request in that case.
3427 */
3428 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3429 err = -EJUKEBOX;
3430 goto out_session;
3431 }
4ae3713f
JL		 3432
3433 /*
3434 * If the session has been REJECTED, then return a hard error,
3435 * unless it's a CLEANRECOVER mount, in which case we'll queue
3436 * it to the mdsc queue.
3437 */
3438 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3439 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3440 list_add(&req->r_wait, &mdsc->waiting_for_map);
3441 else
3442 err = -EACCES;
3443 goto out_session;
3444 }
3445
2f2dc053 3446 if (session->s_state == CEPH_MDS_SESSION_NEW ||
c4853e97 3447 session->s_state == CEPH_MDS_SESSION_CLOSING) {
b682c6d4
XL		 3448 err = __open_session(mdsc, session);
3449 if (err)
3450 goto out_session;
c4853e97
XL		 3451 /* retry the same mds later */
3452 if (random)
3453 req->r_resend_mds = mds;
3454 }
2f2dc053
SW		 3455 list_add(&req->r_wait, &session->s_waiting);
3456 goto out_session;
3457 }
3458
3459 /* send request */
2f2dc053
SW		 3460 req->r_resend_mds = -1; /* forget any previous mds hint */
3461
3462 if (req->r_request_started == 0) /* note request start time */
3463 req->r_request_started = jiffies;
3464
00061645
XL		 3465 /*
3466 * For async create we will choose the auth MDS of frag in parent
3467 * directory to send the request and ususally this works fine, but
3468 * if the migrated the dirtory to another MDS before it could handle
3469 * it the request will be forwarded.
3470 *
3471 * And then the auth cap will be changed.
3472 */
3473 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3474 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3475 struct ceph_inode_info *ci;
3476 struct ceph_cap *cap;
3477
3478 /*
3479 * The request maybe handled very fast and the new inode
3480 * hasn't been linked to the dentry yet. We need to wait
3481 * for the ceph_finish_async_create(), which shouldn't be
3482 * stuck too long or fail in thoery, to finish when forwarding
3483 * the request.
3484 */
3485 if (!d_inode(req->r_dentry)) {
3486 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3487 TASK_KILLABLE);
3488 if (err) {
3489 mutex_lock(&req->r_fill_mutex);
3490 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3491 mutex_unlock(&req->r_fill_mutex);
3492 goto out_session;
3493 }
3494 }
3495
3496 ci = ceph_inode(d_inode(req->r_dentry));
3497
3498 spin_lock(&ci->i_ceph_lock);
3499 cap = ci->i_auth_cap;
3500 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
38d46409
XL		 3501 doutc(cl, "session changed for auth cap %d -> %d\n",
3502 cap->session->s_mds, session->s_mds);
00061645
XL		 3503
3504 /* Remove the auth cap from old session */
3505 spin_lock(&cap->session->s_cap_lock);
3506 cap->session->s_nr_caps--;
3507 list_del_init(&cap->session_caps);
3508 spin_unlock(&cap->session->s_cap_lock);
3509
3510 /* Add the auth cap to the new session */
3511 cap->mds = mds;
3512 cap->session = session;
3513 spin_lock(&session->s_cap_lock);
3514 session->s_nr_caps++;
3515 list_add_tail(&cap->session_caps, &session->s_caps);
3516 spin_unlock(&session->s_cap_lock);
3517
3518 change_auth_cap_ses(ci, session);
3519 }
3520 spin_unlock(&ci->i_ceph_lock);
3521 }
3522
396bd62c 3523 err = __send_request(session, req, false);
2f2dc053
SW		 3524
3525out_session:
3526 ceph_put_mds_session(session);
48fec5d0
YZ		 3527finish:
3528 if (err) {
38d46409 3529 doutc(cl, "early error %d\n", err);
48fec5d0
YZ		 3530 req->r_err = err;
3531 complete_request(mdsc, req);
3532 __unregister_request(mdsc, req);
3533 }
d5548492 3534 return;
2f2dc053
SW		 3535}
3536
3537/*
3538 * called under mdsc->mutex
3539 */
3540static void __wake_requests(struct ceph_mds_client *mdsc,
3541 struct list_head *head)
3542{
38d46409 3543 struct ceph_client *cl = mdsc->fsc->client;
ed75ec2c
YZ		 3544 struct ceph_mds_request *req;
3545 LIST_HEAD(tmp_list);
3546
3547 list_splice_init(head, &tmp_list);
2f2dc053 3548
ed75ec2c
YZ		 3549 while (!list_empty(&tmp_list)) {
3550 req = list_entry(tmp_list.next,
3551 struct ceph_mds_request, r_wait);
2f2dc053 3552 list_del_init(&req->r_wait);
38d46409
XL		 3553 doutc(cl, " wake request %p tid %llu\n", req,
3554 req->r_tid);
2f2dc053
SW		 3555 __do_request(mdsc, req);
3556 }
3557}
3558
3559/*
3560 * Wake up threads with requests pending for @mds, so that they can
29790f26 3561 * resubmit their requests to a possibly different mds.
2f2dc053 3562 */
29790f26 3563static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2f2dc053 3564{
38d46409 3565 struct ceph_client *cl = mdsc->fsc->client;
44ca18f2 3566 struct ceph_mds_request *req;
282c1052 3567 struct rb_node *p = rb_first(&mdsc->request_tree);
2f2dc053 3568
38d46409 3569 doutc(cl, "kick_requests mds%d\n", mds);
282c1052 3570 while (p) {
44ca18f2 3571 req = rb_entry(p, struct ceph_mds_request, r_node);
282c1052 3572 p = rb_next(p);
bc2de10d 3573 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
44ca18f2 3574 continue;
3de22be6
YZ		 3575 if (req->r_attempts > 0)
3576 continue; /* only new requests */
44ca18f2
SW		 3577 if (req->r_session &&
3578 req->r_session->s_mds == mds) {
38d46409 3579 doutc(cl, " kicking tid %llu\n", req->r_tid);
03974e81 3580 list_del_init(&req->r_wait);
44ca18f2 3581 __do_request(mdsc, req);
2f2dc053
SW		 3582 }
3583 }
3584}
3585
86bda539 3586int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2f2dc053
SW		 3587 struct ceph_mds_request *req)
3588{
38d46409 3589 struct ceph_client *cl = mdsc->fsc->client;
891f3f5a 3590 int err = 0;
86bda539
JL		 3591
3592 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3593 if (req->r_inode)
3594 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
9c1c2b35 3595 if (req->r_parent) {
719a2514
YZ		 3596 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3597 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3598 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3599 spin_lock(&ci->i_ceph_lock);
3600 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3601 __ceph_touch_fmode(ci, mdsc, fmode);
3602 spin_unlock(&ci->i_ceph_lock);
9c1c2b35 3603 }
86bda539
JL		 3604 if (req->r_old_dentry_dir)
3605 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3606 CEPH_CAP_PIN);
3607
891f3f5a
JL		 3608 if (req->r_inode) {
3609 err = ceph_wait_on_async_create(req->r_inode);
3610 if (err) {
38d46409 3611 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3612 return err;
3613 }
3614 }
3615
3616 if (!err && req->r_old_inode) {
3617 err = ceph_wait_on_async_create(req->r_old_inode);
3618 if (err) {
38d46409 3619 doutc(cl, "wait for async create returned: %d\n", err);
891f3f5a
JL		 3620 return err;
3621 }
3622 }
3623
38d46409 3624 doutc(cl, "submit_request on %p for inode %p\n", req, dir);
2f2dc053 3625 mutex_lock(&mdsc->mutex);
86bda539 3626 __register_request(mdsc, req, dir);
2f2dc053 3627 __do_request(mdsc, req);
86bda539 3628 err = req->r_err;
2f2dc053 3629 mutex_unlock(&mdsc->mutex);
86bda539 3630 return err;
2f2dc053
SW		 3631}
3632
9eaa7b79
JL		 3633int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3634 struct ceph_mds_request *req,
3635 ceph_mds_request_wait_callback_t wait_func)
2f2dc053 3636{
38d46409 3637 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3638 int err;
3639
e1518c7c 3640 /* wait */
38d46409 3641 doutc(cl, "do_request waiting\n");
9eaa7b79
JL		 3642 if (wait_func) {
3643 err = wait_func(mdsc, req);
e1518c7c 3644 } else {
5be73034
ID		 3645 long timeleft = wait_for_completion_killable_timeout(
3646 &req->r_completion,
3647 ceph_timeout_jiffies(req->r_timeout));
3648 if (timeleft > 0)
3649 err = 0;
3650 else if (!timeleft)
8ccf7fcc 3651 err = -ETIMEDOUT; /* timed out */
5be73034
ID		 3652 else
3653 err = timeleft; /* killed */
e1518c7c 3654 }
38d46409 3655 doutc(cl, "do_request waited, got %d\n", err);
e1518c7c 3656 mutex_lock(&mdsc->mutex);
5b1daecd 3657
e1518c7c 3658 /* only abort if we didn't race with a real reply */
bc2de10d 3659 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
e1518c7c
SW		 3660 err = le32_to_cpu(req->r_reply_info.head->result);
3661 } else if (err < 0) {
38d46409 3662 doutc(cl, "aborted request %lld with %d\n", req->r_tid, err);
b4556396
SW		 3663
3664 /*
3665 * ensure we aren't running concurrently with
3666 * ceph_fill_trace or ceph_readdir_prepopulate, which
3667 * rely on locks (dir mutex) held by our caller.
3668 */
3669 mutex_lock(&req->r_fill_mutex);
e1518c7c 3670 req->r_err = err;
bc2de10d 3671 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
b4556396 3672 mutex_unlock(&req->r_fill_mutex);
5b1daecd 3673
3dd69aab 3674 if (req->r_parent &&
167c9e35
SW		 3675 (req->r_op & CEPH_MDS_OP_WRITE))
3676 ceph_invalidate_dir_request(req);
2f2dc053 3677 } else {
e1518c7c 3678 err = req->r_err;
2f2dc053 3679 }
2f2dc053 3680
e1518c7c 3681 mutex_unlock(&mdsc->mutex);
8340f22c
JL		 3682 return err;
3683}
3684
3685/*
3686 * Synchrously perform an mds request. Take care of all of the
3687 * session setup, forwarding, retry details.
3688 */
3689int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3690 struct inode *dir,
3691 struct ceph_mds_request *req)
3692{
38d46409 3693 struct ceph_client *cl = mdsc->fsc->client;
8340f22c
JL		 3694 int err;
3695
38d46409 3696 doutc(cl, "do_request on %p\n", req);
8340f22c
JL		 3697
3698 /* issue */
3699 err = ceph_mdsc_submit_request(mdsc, dir, req);
3700 if (!err)
9eaa7b79 3701 err = ceph_mdsc_wait_request(mdsc, req, NULL);
38d46409 3702 doutc(cl, "do_request %p done, result %d\n", req, err);
2f2dc053
SW		 3703 return err;
3704}
3705
167c9e35 3706/*
2f276c51 3707 * Invalidate dir's completeness, dentry lease state on an aborted MDS
167c9e35
SW		 3708 * namespace request.
3709 */
3710void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3711{
8d8f371c
YZ		 3712 struct inode *dir = req->r_parent;
3713 struct inode *old_dir = req->r_old_dentry_dir;
38d46409 3714 struct ceph_client *cl = req->r_mdsc->fsc->client;
167c9e35 3715
38d46409
XL		 3716 doutc(cl, "invalidate_dir_request %p %p (complete, lease(s))\n",
3717 dir, old_dir);
167c9e35 3718
8d8f371c
YZ		 3719 ceph_dir_clear_complete(dir);
3720 if (old_dir)
3721 ceph_dir_clear_complete(old_dir);
167c9e35
SW		 3722 if (req->r_dentry)
3723 ceph_invalidate_dentry_lease(req->r_dentry);
3724 if (req->r_old_dentry)
3725 ceph_invalidate_dentry_lease(req->r_old_dentry);
3726}
3727
2f2dc053
SW		 3728/*
3729 * Handle mds reply.
3730 *
3731 * We take the session mutex and parse and process the reply immediately.
3732 * This preserves the logical ordering of replies, capabilities, etc., sent
3733 * by the MDS as they are applied to our local cache.
3734 */
3735static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3736{
3737 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 3738 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 3739 struct ceph_mds_request *req;
3740 struct ceph_mds_reply_head *head = msg->front.iov_base;
3741 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
982d6011 3742 struct ceph_snap_realm *realm;
2f2dc053
SW		 3743 u64 tid;
3744 int err, result;
2600d2dd 3745 int mds = session->s_mds;
a68e564a 3746 bool close_sessions = false;
2f2dc053 3747
2f2dc053 3748 if (msg->front.iov_len < sizeof(*head)) {
38d46409 3749 pr_err_client(cl, "got corrupt (short) reply\n");
9ec7cab1 3750 ceph_msg_dump(msg);
2f2dc053
SW		 3751 return;
3752 }
3753
3754 /* get request, session */
6df058c0 3755 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053 3756 mutex_lock(&mdsc->mutex);
fcd00b68 3757 req = lookup_get_request(mdsc, tid);
2f2dc053 3758 if (!req) {
38d46409 3759 doutc(cl, "on unknown tid %llu\n", tid);
2f2dc053
SW		 3760 mutex_unlock(&mdsc->mutex);
3761 return;
3762 }
38d46409 3763 doutc(cl, "handle_reply %p\n", req);
2f2dc053
SW		 3764
3765 /* correct session? */
d96d6049 3766 if (req->r_session != session) {
38d46409
XL		 3767 pr_err_client(cl, "got %llu on session mds%d not mds%d\n",
3768 tid, session->s_mds,
3769 req->r_session ? req->r_session->s_mds : -1);
2f2dc053
SW		 3770 mutex_unlock(&mdsc->mutex);
3771 goto out;
3772 }
3773
3774 /* dup? */
bc2de10d
JL		 3775 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3776 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
38d46409
XL		 3777 pr_warn_client(cl, "got a dup %s reply on %llu from mds%d\n",
3778 head->safe ? "safe" : "unsafe", tid, mds);
2f2dc053
SW		 3779 mutex_unlock(&mdsc->mutex);
3780 goto out;
3781 }
bc2de10d 3782 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
38d46409
XL		 3783 pr_warn_client(cl, "got unsafe after safe on %llu from mds%d\n",
3784 tid, mds);
85792d0d
SW		 3785 mutex_unlock(&mdsc->mutex);
3786 goto out;
3787 }
2f2dc053
SW		 3788
3789 result = le32_to_cpu(head->result);
3790
2f2dc053 3791 if (head->safe) {
bc2de10d 3792 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2f2dc053 3793 __unregister_request(mdsc, req);
2f2dc053 3794
07edc057
XL		 3795 /* last request during umount? */
3796 if (mdsc->stopping && !__get_oldest_req(mdsc))
3797 complete_all(&mdsc->safe_umount_waiters);
3798
bc2de10d 3799 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2f2dc053
SW		 3800 /*
3801 * We already handled the unsafe response, now do the
3802 * cleanup. No need to examine the response; the MDS
3803 * doesn't include any result info in the safe
3804 * response. And even if it did, there is nothing
3805 * useful we could do with a revised return value.
3806 */
38d46409 3807 doutc(cl, "got safe reply %llu, mds%d\n", tid, mds);
2f2dc053 3808
2f2dc053
SW		 3809 mutex_unlock(&mdsc->mutex);
3810 goto out;
3811 }
e1518c7c 3812 } else {
bc2de10d 3813 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2f2dc053
SW		 3814 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3815 }
3816
38d46409 3817 doutc(cl, "tid %lld result %d\n", tid, result);
b37fe1f9 3818 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3859af9e 3819 err = parse_reply_info(session, msg, req, (u64)-1);
b37fe1f9 3820 else
3859af9e
XL		 3821 err = parse_reply_info(session, msg, req,
3822 session->s_con.peer_features);
2f2dc053
SW		 3823 mutex_unlock(&mdsc->mutex);
3824
bca9fc14 3825 /* Must find target inode outside of mutexes to avoid deadlocks */
3859af9e 3826 rinfo = &req->r_reply_info;
bca9fc14 3827 if ((err >= 0) && rinfo->head->is_target) {
ec9595c0 3828 struct inode *in = xchg(&req->r_new_inode, NULL);
bca9fc14
JL		 3829 struct ceph_vino tvino = {
3830 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3831 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3832 };
3833
ec9595c0
JL		 3834 /*
3835 * If we ended up opening an existing inode, discard
3836 * r_new_inode
3837 */
3838 if (req->r_op == CEPH_MDS_OP_CREATE &&
3839 !req->r_reply_info.has_create_ino) {
3840 /* This should never happen on an async create */
3841 WARN_ON_ONCE(req->r_deleg_ino);
3842 iput(in);
3843 in = NULL;
3844 }
3845
3846 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
bca9fc14
JL		 3847 if (IS_ERR(in)) {
3848 err = PTR_ERR(in);
3849 mutex_lock(&session->s_mutex);
3850 goto out_err;
3851 }
3852 req->r_target_inode = in;
3853 }
3854
2f2dc053
SW		 3855 mutex_lock(&session->s_mutex);
3856 if (err < 0) {
38d46409
XL		 3857 pr_err_client(cl, "got corrupt reply mds%d(tid:%lld)\n",
3858 mds, tid);
9ec7cab1 3859 ceph_msg_dump(msg);
2f2dc053
SW		 3860 goto out_err;
3861 }
3862
3863 /* snap trace */
982d6011 3864 realm = NULL;
2f2dc053
SW		 3865 if (rinfo->snapblob_len) {
3866 down_write(&mdsc->snap_rwsem);
a68e564a 3867 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
982d6011
YZ		 3868 rinfo->snapblob + rinfo->snapblob_len,
3869 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3870 &realm);
a68e564a
XL		 3871 if (err) {
3872 up_write(&mdsc->snap_rwsem);
3873 close_sessions = true;
3874 if (err == -EIO)
3875 ceph_msg_dump(msg);
3876 goto out_err;
3877 }
2f2dc053
SW		 3878 downgrade_write(&mdsc->snap_rwsem);
3879 } else {
3880 down_read(&mdsc->snap_rwsem);
3881 }
3882
3883 /* insert trace into our cache */
b4556396 3884 mutex_lock(&req->r_fill_mutex);
315f2408 3885 current->journal_info = req;
f5a03b08 3886 err = ceph_fill_trace(mdsc->fsc->sb, req);
2f2dc053 3887 if (err == 0) {
6e8575fa 3888 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
81c6aea5 3889 req->r_op == CEPH_MDS_OP_LSSNAP))
af9ffa6d 3890 err = ceph_readdir_prepopulate(req, req->r_session);
2f2dc053 3891 }
315f2408 3892 current->journal_info = NULL;
b4556396 3893 mutex_unlock(&req->r_fill_mutex);
2f2dc053
SW		 3894
3895 up_read(&mdsc->snap_rwsem);
982d6011
YZ		 3896 if (realm)
3897 ceph_put_snap_realm(mdsc, realm);
68cd5b4b 3898
fe33032d
YZ		 3899 if (err == 0) {
3900 if (req->r_target_inode &&
3901 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3902 struct ceph_inode_info *ci =
3903 ceph_inode(req->r_target_inode);
3904 spin_lock(&ci->i_unsafe_lock);
3905 list_add_tail(&req->r_unsafe_target_item,
3906 &ci->i_unsafe_iops);
3907 spin_unlock(&ci->i_unsafe_lock);
3908 }
3909
3910 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
68cd5b4b 3911 }
2f2dc053 3912out_err:
e1518c7c 3913 mutex_lock(&mdsc->mutex);
bc2de10d 3914 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
e1518c7c
SW		 3915 if (err) {
3916 req->r_err = err;
3917 } else {
5fdb1389 3918 req->r_reply = ceph_msg_get(msg);
bc2de10d 3919 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
e1518c7c 3920 }
2f2dc053 3921 } else {
38d46409 3922 doutc(cl, "reply arrived after request %lld was aborted\n", tid);
2f2dc053 3923 }
e1518c7c 3924 mutex_unlock(&mdsc->mutex);
2f2dc053 3925
2f2dc053
SW		 3926 mutex_unlock(&session->s_mutex);
3927
3928 /* kick calling process */
3929 complete_request(mdsc, req);
70c94820 3930
8ae99ae2 3931 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
70c94820 3932 req->r_end_latency, err);
2f2dc053
SW		 3933out:
3934 ceph_mdsc_put_request(req);
a68e564a
XL		 3935
3936 /* Defer closing the sessions after s_mutex lock being released */
3937 if (close_sessions)
3938 ceph_mdsc_close_sessions(mdsc);
2f2dc053
SW		 3939 return;
3940}
3941
3942
3943
3944/*
3945 * handle mds notification that our request has been forwarded.
3946 */
2600d2dd
SW		 3947static void handle_forward(struct ceph_mds_client *mdsc,
3948 struct ceph_mds_session *session,
3949 struct ceph_msg *msg)
2f2dc053 3950{
38d46409 3951 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 3952 struct ceph_mds_request *req;
a1ea787c 3953 u64 tid = le64_to_cpu(msg->hdr.tid);
2f2dc053
SW		 3954 u32 next_mds;
3955 u32 fwd_seq;
2f2dc053
SW		 3956 int err = -EINVAL;
3957 void *p = msg->front.iov_base;
3958 void *end = p + msg->front.iov_len;
1980b1bf 3959 bool aborted = false;
2f2dc053 3960
a1ea787c 3961 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
c89136ea
SW		 3962 next_mds = ceph_decode_32(&p);
3963 fwd_seq = ceph_decode_32(&p);
2f2dc053
SW		 3964
3965 mutex_lock(&mdsc->mutex);
fcd00b68 3966 req = lookup_get_request(mdsc, tid);
2f2dc053 3967 if (!req) {
1980b1bf 3968 mutex_unlock(&mdsc->mutex);
38d46409 3969 doutc(cl, "forward tid %llu to mds%d - req dne\n", tid, next_mds);
1980b1bf 3970 return; /* dup reply? */
2f2dc053
SW		 3971 }
3972
bc2de10d 3973 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
38d46409 3974 doutc(cl, "forward tid %llu aborted, unregistering\n", tid);
2a8e5e36 3975 __unregister_request(mdsc, req);
ce0d5bd3 3976 } else if (fwd_seq <= req->r_num_fwd || (uint32_t)fwd_seq >= U32_MAX) {
1980b1bf 3977 /*
ce0d5bd3 3978 * Avoid inifinite retrying after overflow.
1980b1bf 3979 *
ce0d5bd3
XL		 3980 * The MDS will increase the fwd count and in client side
3981 * if the num_fwd is less than the one saved in request
3982 * that means the MDS is an old version and overflowed of
3983 * 8 bits.
1980b1bf 3984 */
ce0d5bd3
XL		 3985 mutex_lock(&req->r_fill_mutex);
3986 req->r_err = -EMULTIHOP;
3987 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3988 mutex_unlock(&req->r_fill_mutex);
3989 aborted = true;
38d46409
XL		 3990 pr_warn_ratelimited_client(cl, "forward tid %llu seq overflow\n",
3991 tid);
2f2dc053
SW		 3992 } else {
3993 /* resend. forward race not possible; mds would drop */
38d46409 3994 doutc(cl, "forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2a8e5e36 3995 BUG_ON(req->r_err);
bc2de10d 3996 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3de22be6 3997 req->r_attempts = 0;
2f2dc053
SW		 3998 req->r_num_fwd = fwd_seq;
3999 req->r_resend_mds = next_mds;
4000 put_request_session(req);
4001 __do_request(mdsc, req);
4002 }
2f2dc053 4003 mutex_unlock(&mdsc->mutex);
1980b1bf
XL		 4004
4005 /* kick calling process */
4006 if (aborted)
4007 complete_request(mdsc, req);
4008 ceph_mdsc_put_request(req);
2f2dc053
SW		 4009 return;
4010
4011bad:
38d46409 4012 pr_err_client(cl, "decode error err=%d\n", err);
8b0da5c5 4013 ceph_msg_dump(msg);
2f2dc053
SW		 4014}
4015
131d7eb4 4016static int __decode_session_metadata(void **p, void *end,
0b98acd6 4017 bool *blocklisted)
84bf3950
YZ		 4018{
4019 /* map<string,string> */
4020 u32 n;
131d7eb4 4021 bool err_str;
84bf3950
YZ		 4022 ceph_decode_32_safe(p, end, n, bad);
4023 while (n-- > 0) {
4024 u32 len;
4025 ceph_decode_32_safe(p, end, len, bad);
4026 ceph_decode_need(p, end, len, bad);
131d7eb4 4027 err_str = !strncmp(*p, "error_string", len);
84bf3950
YZ		 4028 *p += len;
4029 ceph_decode_32_safe(p, end, len, bad);
4030 ceph_decode_need(p, end, len, bad);
4bb926e8
ID		 4031 /*
4032 * Match "blocklisted (blacklisted)" from newer MDSes,
4033 * or "blacklisted" from older MDSes.
4034 */
131d7eb4 4035 if (err_str && strnstr(*p, "blacklisted", len))
0b98acd6 4036 *blocklisted = true;
84bf3950
YZ		 4037 *p += len;
4038 }
4039 return 0;
4040bad:
4041 return -1;
4042}
4043
2f2dc053
SW		 4044/*
4045 * handle a mds session control message
4046 */
4047static void handle_session(struct ceph_mds_session *session,
4048 struct ceph_msg *msg)
4049{
4050 struct ceph_mds_client *mdsc = session->s_mdsc;
38d46409 4051 struct ceph_client *cl = mdsc->fsc->client;
84bf3950
YZ		 4052 int mds = session->s_mds;
4053 int msg_version = le16_to_cpu(msg->hdr.version);
4054 void *p = msg->front.iov_base;
4055 void *end = p + msg->front.iov_len;
4056 struct ceph_mds_session_head *h;
2f2dc053 4057 u32 op;
0fa82633 4058 u64 seq, features = 0;
2f2dc053 4059 int wake = 0;
0b98acd6 4060 bool blocklisted = false;
2f2dc053 4061
2f2dc053 4062 /* decode */
84bf3950
YZ		 4063 ceph_decode_need(&p, end, sizeof(*h), bad);
4064 h = p;
4065 p += sizeof(*h);
4066
2f2dc053
SW		 4067 op = le32_to_cpu(h->op);
4068 seq = le64_to_cpu(h->seq);
4069
84bf3950
YZ		 4070 if (msg_version >= 3) {
4071 u32 len;
e1c9788c
KH		 4072 /* version >= 2 and < 5, decode metadata, skip otherwise
4073 * as it's handled via flags.
4074 */
4075 if (msg_version >= 5)
4076 ceph_decode_skip_map(&p, end, string, string, bad);
4077 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
84bf3950 4078 goto bad;
e1c9788c 4079
84bf3950
YZ		 4080 /* version >= 3, feature bits */
4081 ceph_decode_32_safe(&p, end, len, bad);
02e37571
JL		 4082 if (len) {
4083 ceph_decode_64_safe(&p, end, features, bad);
4084 p += len - sizeof(features);
4085 }
84bf3950
YZ		 4086 }
4087
e1c9788c 4088 if (msg_version >= 5) {
ea16567f
LH		 4089 u32 flags, len;
4090
4091 /* version >= 4 */
4092 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
4093 ceph_decode_32_safe(&p, end, len, bad); /* len */
4094 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
4095
e1c9788c 4096 /* version >= 5, flags */
ea16567f 4097 ceph_decode_32_safe(&p, end, flags, bad);
e1c9788c 4098 if (flags & CEPH_SESSION_BLOCKLISTED) {
38d46409
XL		 4099 pr_warn_client(cl, "mds%d session blocklisted\n",
4100 session->s_mds);
e1c9788c
KH		 4101 blocklisted = true;
4102 }
4103 }
4104
2f2dc053 4105 mutex_lock(&mdsc->mutex);
0a07fc8c 4106 if (op == CEPH_SESSION_CLOSE) {
5b3248c6 4107 ceph_get_mds_session(session);
2600d2dd 4108 __unregister_session(mdsc, session);
0a07fc8c 4109 }
2f2dc053
SW		 4110 /* FIXME: this ttl calculation is generous */
4111 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
4112 mutex_unlock(&mdsc->mutex);
4113
4114 mutex_lock(&session->s_mutex);
4115
38d46409
XL		 4116 doutc(cl, "mds%d %s %p state %s seq %llu\n", mds,
4117 ceph_session_op_name(op), session,
4118 ceph_session_state_name(session->s_state), seq);
2f2dc053
SW		 4119
4120 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
4121 session->s_state = CEPH_MDS_SESSION_OPEN;
38d46409 4122 pr_info_client(cl, "mds%d came back\n", session->s_mds);
2f2dc053
SW		 4123 }
4124
4125 switch (op) {
4126 case CEPH_SESSION_OPEN:
29790f26 4127 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4128 pr_info_client(cl, "mds%d reconnect success\n",
4129 session->s_mds);
300e42a2
XL		 4130
4131 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
38d46409
XL		 4132 pr_notice_client(cl, "mds%d is already opened\n",
4133 session->s_mds);
300e42a2
XL		 4134 } else {
4135 session->s_state = CEPH_MDS_SESSION_OPEN;
4136 session->s_features = features;
4137 renewed_caps(mdsc, session, 0);
4138 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4139 &session->s_features))
4140 metric_schedule_delayed(&mdsc->metric);
4141 }
4142
4143 /*
4144 * The connection maybe broken and the session in client
4145 * side has been reinitialized, need to update the seq
4146 * anyway.
4147 */
4148 if (!session->s_seq && seq)
4149 session->s_seq = seq;
4150
2f2dc053
SW		 4151 wake = 1;
4152 if (mdsc->stopping)
4153 __close_session(mdsc, session);
4154 break;
4155
4156 case CEPH_SESSION_RENEWCAPS:
4157 if (session->s_renew_seq == seq)
4158 renewed_caps(mdsc, session, 1);
4159 break;
4160
4161 case CEPH_SESSION_CLOSE:
29790f26 4162 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
38d46409
XL		 4163 pr_info_client(cl, "mds%d reconnect denied\n",
4164 session->s_mds);
4d681c2f 4165 session->s_state = CEPH_MDS_SESSION_CLOSED;
1c841a96 4166 cleanup_session_requests(mdsc, session);
2f2dc053 4167 remove_session_caps(session);
656e4382 4168 wake = 2; /* for good measure */
f3c60c59 4169 wake_up_all(&mdsc->session_close_wq);
2f2dc053
SW		 4170 break;
4171
4172 case CEPH_SESSION_STALE:
38d46409
XL		 4173 pr_info_client(cl, "mds%d caps went stale, renewing\n",
4174 session->s_mds);
52d60f8e 4175 atomic_inc(&session->s_cap_gen);
1ce208a6 4176 session->s_cap_ttl = jiffies - 1;
2f2dc053
SW		 4177 send_renew_caps(mdsc, session);
4178 break;
4179
4180 case CEPH_SESSION_RECALL_STATE:
e30ee581 4181 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2f2dc053
SW		 4182 break;
4183
186e4f7a 4184 case CEPH_SESSION_FLUSHMSG:
e7d84c6a
XL		 4185 /* flush cap releases */
4186 spin_lock(&session->s_cap_lock);
4187 if (session->s_num_cap_releases)
4188 ceph_flush_cap_releases(mdsc, session);
4189 spin_unlock(&session->s_cap_lock);
4190
186e4f7a
YZ		 4191 send_flushmsg_ack(mdsc, session, seq);
4192 break;
4193
03f4fcb0 4194 case CEPH_SESSION_FORCE_RO:
38d46409 4195 doutc(cl, "force_session_readonly %p\n", session);
03f4fcb0
YZ		 4196 spin_lock(&session->s_cap_lock);
4197 session->s_readonly = true;
4198 spin_unlock(&session->s_cap_lock);
d2f8bb27 4199 wake_up_session_caps(session, FORCE_RO);
03f4fcb0
YZ		 4200 break;
4201
fcff415c
YZ		 4202 case CEPH_SESSION_REJECT:
4203 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
38d46409
XL		 4204 pr_info_client(cl, "mds%d rejected session\n",
4205 session->s_mds);
fcff415c
YZ		 4206 session->s_state = CEPH_MDS_SESSION_REJECTED;
4207 cleanup_session_requests(mdsc, session);
4208 remove_session_caps(session);
0b98acd6
ID		 4209 if (blocklisted)
4210 mdsc->fsc->blocklisted = true;
fcff415c
YZ		 4211 wake = 2; /* for good measure */
4212 break;
4213
2f2dc053 4214 default:
38d46409 4215 pr_err_client(cl, "bad op %d mds%d\n", op, mds);
2f2dc053
SW		 4216 WARN_ON(1);
4217 }
4218
4219 mutex_unlock(&session->s_mutex);
4220 if (wake) {
4221 mutex_lock(&mdsc->mutex);
4222 __wake_requests(mdsc, &session->s_waiting);
656e4382
YZ		 4223 if (wake == 2)
4224 kick_requests(mdsc, mds);
2f2dc053
SW		 4225 mutex_unlock(&mdsc->mutex);
4226 }
0a07fc8c
YZ		 4227 if (op == CEPH_SESSION_CLOSE)
4228 ceph_put_mds_session(session);
2f2dc053
SW		 4229 return;
4230
4231bad:
38d46409
XL		 4232 pr_err_client(cl, "corrupt message mds%d len %d\n", mds,
4233 (int)msg->front.iov_len);
9ec7cab1 4234 ceph_msg_dump(msg);
2f2dc053
SW		 4235 return;
4236}
4237
a25949b9
JL		 4238void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4239{
38d46409 4240 struct ceph_client *cl = req->r_mdsc->fsc->client;
a25949b9
JL		 4241 int dcaps;
4242
4243 dcaps = xchg(&req->r_dir_caps, 0);
4244 if (dcaps) {
38d46409 4245 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
a25949b9
JL		 4246 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4247 }
4248}
4249
e64f44a8
XL		 4250void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
4251{
38d46409 4252 struct ceph_client *cl = req->r_mdsc->fsc->client;
e64f44a8
XL		 4253 int dcaps;
4254
4255 dcaps = xchg(&req->r_dir_caps, 0);
4256 if (dcaps) {
38d46409 4257 doutc(cl, "releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
e64f44a8
XL		 4258 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
4259 dcaps);
4260 }
4261}
4262
2f2dc053
SW		 4263/*
4264 * called under session->mutex.
4265 */
4266static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4267 struct ceph_mds_session *session)
4268{
4269 struct ceph_mds_request *req, *nreq;
3de22be6 4270 struct rb_node *p;
2f2dc053 4271
38d46409 4272 doutc(mdsc->fsc->client, "mds%d\n", session->s_mds);
2f2dc053
SW		 4273
4274 mutex_lock(&mdsc->mutex);
9cf54563 4275 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
396bd62c 4276 __send_request(session, req, true);
3de22be6
YZ		 4277
4278 /*
4279 * also re-send old requests when MDS enters reconnect stage. So that MDS
4280 * can process completed request in clientreplay stage.
4281 */
4282 p = rb_first(&mdsc->request_tree);
4283 while (p) {
4284 req = rb_entry(p, struct ceph_mds_request, r_node);
4285 p = rb_next(p);
bc2de10d 4286 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3de22be6
YZ		 4287 continue;
4288 if (req->r_attempts == 0)
4289 continue; /* only old requests */
a25949b9
JL		 4290 if (!req->r_session)
4291 continue;
4292 if (req->r_session->s_mds != session->s_mds)
4293 continue;
4294
e64f44a8 4295 ceph_mdsc_release_dir_caps_no_check(req);
a25949b9 4296
396bd62c 4297 __send_request(session, req, true);
3de22be6 4298 }
2f2dc053
SW		 4299 mutex_unlock(&mdsc->mutex);
4300}
4301
81c5a148
YZ		 4302static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4303{
4304 struct ceph_msg *reply;
4305 struct ceph_pagelist *_pagelist;
4306 struct page *page;
4307 __le32 *addr;
4308 int err = -ENOMEM;
4309
4310 if (!recon_state->allow_multi)
4311 return -ENOSPC;
4312
4313 /* can't handle message that contains both caps and realm */
4314 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4315
4316 /* pre-allocate new pagelist */
4317 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4318 if (!_pagelist)
4319 return -ENOMEM;
4320
4321 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4322 if (!reply)
4323 goto fail_msg;
4324
4325 /* placeholder for nr_caps */
4326 err = ceph_pagelist_encode_32(_pagelist, 0);
4327 if (err < 0)
4328 goto fail;
4329
4330 if (recon_state->nr_caps) {
4331 /* currently encoding caps */
4332 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4333 if (err)
4334 goto fail;
4335 } else {
4336 /* placeholder for nr_realms (currently encoding relams) */
4337 err = ceph_pagelist_encode_32(_pagelist, 0);
4338 if (err < 0)
4339 goto fail;
4340 }
4341
4342 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4343 if (err)
4344 goto fail;
4345
4346 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4347 addr = kmap_atomic(page);
4348 if (recon_state->nr_caps) {
4349 /* currently encoding caps */
4350 *addr = cpu_to_le32(recon_state->nr_caps);
4351 } else {
4352 /* currently encoding relams */
4353 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4354 }
4355 kunmap_atomic(addr);
4356
4357 reply->hdr.version = cpu_to_le16(5);
4358 reply->hdr.compat_version = cpu_to_le16(4);
4359
4360 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4361 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4362
4363 ceph_con_send(&recon_state->session->s_con, reply);
4364 ceph_pagelist_release(recon_state->pagelist);
4365
4366 recon_state->pagelist = _pagelist;
4367 recon_state->nr_caps = 0;
4368 recon_state->nr_realms = 0;
4369 recon_state->msg_version = 5;
4370 return 0;
4371fail:
4372 ceph_msg_put(reply);
4373fail_msg:
4374 ceph_pagelist_release(_pagelist);
4375 return err;
4376}
4377
a33f6432
YZ		 4378static struct dentry* d_find_primary(struct inode *inode)
4379{
4380 struct dentry *alias, *dn = NULL;
4381
4382 if (hlist_empty(&inode->i_dentry))
4383 return NULL;
4384
4385 spin_lock(&inode->i_lock);
4386 if (hlist_empty(&inode->i_dentry))
4387 goto out_unlock;
4388
4389 if (S_ISDIR(inode->i_mode)) {
4390 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4391 if (!IS_ROOT(alias))
4392 dn = dget(alias);
4393 goto out_unlock;
4394 }
4395
4396 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4397 spin_lock(&alias->d_lock);
4398 if (!d_unhashed(alias) &&
4399 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4400 dn = dget_dlock(alias);
4401 }
4402 spin_unlock(&alias->d_lock);
4403 if (dn)
4404 break;
4405 }
4406out_unlock:
4407 spin_unlock(&inode->i_lock);
4408 return dn;
4409}
4410
2f2dc053
SW		 4411/*
4412 * Encode information about a cap for a reconnect with the MDS.
4413 */
aaf67de7 4414static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
2f2dc053 4415{
197b7d79 4416 struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
38d46409 4417 struct ceph_client *cl = ceph_inode_to_client(inode);
20cb34ae
SW		 4418 union {
4419 struct ceph_mds_cap_reconnect v2;
4420 struct ceph_mds_cap_reconnect_v1 v1;
4421 } rec;
aaf67de7 4422 struct ceph_inode_info *ci = ceph_inode(inode);
20cb34ae
SW		 4423 struct ceph_reconnect_state *recon_state = arg;
4424 struct ceph_pagelist *pagelist = recon_state->pagelist;
a33f6432 4425 struct dentry *dentry;
aaf67de7 4426 struct ceph_cap *cap;
a33f6432 4427 char *path;
9aaa7eb0 4428 int pathlen = 0, err;
a33f6432 4429 u64 pathbase;
3469ed0d 4430 u64 snap_follows;
2f2dc053 4431
a33f6432
YZ		 4432 dentry = d_find_primary(inode);
4433 if (dentry) {
4434 /* set pathbase to parent dir when msg_version >= 2 */
197b7d79 4435 path = ceph_mdsc_build_path(mdsc, dentry, &pathlen, &pathbase,
a33f6432
YZ		 4436 recon_state->msg_version >= 2);
4437 dput(dentry);
4438 if (IS_ERR(path)) {
4439 err = PTR_ERR(path);
4440 goto out_err;
4441 }
4442 } else {
4443 path = NULL;
a33f6432
YZ		 4444 pathbase = 0;
4445 }
4446
be655596 4447 spin_lock(&ci->i_ceph_lock);
aaf67de7
XL		 4448 cap = __get_cap_for_mds(ci, mds);
4449 if (!cap) {
4450 spin_unlock(&ci->i_ceph_lock);
9aaa7eb0 4451 err = 0;
aaf67de7
XL		 4452 goto out_err;
4453 }
38d46409
XL		 4454 doutc(cl, " adding %p ino %llx.%llx cap %p %lld %s\n", inode,
4455 ceph_vinop(inode), cap, cap->cap_id,
4456 ceph_cap_string(cap->issued));
aaf67de7 4457
2f2dc053
SW		 4458 cap->seq = 0; /* reset cap seq */
4459 cap->issue_seq = 0; /* and issue_seq */
667ca05c 4460 cap->mseq = 0; /* and migrate_seq */
52d60f8e 4461 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
20cb34ae 4462
a25949b9 4463 /* These are lost when the session goes away */
785892fe
JL		 4464 if (S_ISDIR(inode->i_mode)) {
4465 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4466 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4467 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4468 }
a25949b9 4469 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
785892fe 4470 }
a25949b9 4471
121f22a1 4472 if (recon_state->msg_version >= 2) {
20cb34ae
SW		 4473 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4474 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4475 rec.v2.issued = cpu_to_le32(cap->issued);
4476 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4477 rec.v2.pathbase = cpu_to_le64(pathbase);
ec1dff25
JL		 4478 rec.v2.flock_len = (__force __le32)
4479 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
20cb34ae 4480 } else {
c453bdb5
JL		 4481 struct timespec64 ts;
4482
20cb34ae
SW		 4483 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4484 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4485 rec.v1.issued = cpu_to_le32(cap->issued);
2d6795fb 4486 rec.v1.size = cpu_to_le64(i_size_read(inode));
c453bdb5
JL		 4487 ts = inode_get_mtime(inode);
4488 ceph_encode_timespec64(&rec.v1.mtime, &ts);
4489 ts = inode_get_atime(inode);
4490 ceph_encode_timespec64(&rec.v1.atime, &ts);
20cb34ae 4491 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
a33f6432 4492 rec.v1.pathbase = cpu_to_le64(pathbase);
20cb34ae 4493 }
3469ed0d
YZ		 4494
4495 if (list_empty(&ci->i_cap_snaps)) {
92776fd2 4496 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3469ed0d
YZ		 4497 } else {
4498 struct ceph_cap_snap *capsnap =
4499 list_first_entry(&ci->i_cap_snaps,
4500 struct ceph_cap_snap, ci_item);
4501 snap_follows = capsnap->follows;
20cb34ae 4502 }
be655596 4503 spin_unlock(&ci->i_ceph_lock);
2f2dc053 4504
121f22a1 4505 if (recon_state->msg_version >= 2) {
40819f6f 4506 int num_fcntl_locks, num_flock_locks;
4deb14a2 4507 struct ceph_filelock *flocks = NULL;
81c5a148 4508 size_t struct_len, total_len = sizeof(u64);
121f22a1 4509 u8 struct_v = 0;
39be95e9
JS		 4510
4511encode_again:
b3f8d68f
YZ		 4512 if (rec.v2.flock_len) {
4513 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4514 } else {
4515 num_fcntl_locks = 0;
4516 num_flock_locks = 0;
4517 }
4deb14a2 4518 if (num_fcntl_locks + num_flock_locks > 0) {
6da2ec56
KC		 4519 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4520 sizeof(struct ceph_filelock),
4521 GFP_NOFS);
4deb14a2
YZ		 4522 if (!flocks) {
4523 err = -ENOMEM;
5ccedf1c 4524 goto out_err;
4deb14a2
YZ		 4525 }
4526 err = ceph_encode_locks_to_buffer(inode, flocks,
4527 num_fcntl_locks,
4528 num_flock_locks);
4529 if (err) {
4530 kfree(flocks);
4531 flocks = NULL;
4532 if (err == -ENOSPC)
4533 goto encode_again;
5ccedf1c 4534 goto out_err;
4deb14a2
YZ		 4535 }
4536 } else {
39be95e9 4537 kfree(flocks);
4deb14a2 4538 flocks = NULL;
39be95e9 4539 }
121f22a1
YZ		 4540
4541 if (recon_state->msg_version >= 3) {
4542 /* version, compat_version and struct_len */
81c5a148 4543 total_len += 2 * sizeof(u8) + sizeof(u32);
3469ed0d 4544 struct_v = 2;
121f22a1 4545 }
39be95e9
JS		 4546 /*
4547 * number of encoded locks is stable, so copy to pagelist
4548 */
121f22a1
YZ		 4549 struct_len = 2 * sizeof(u32) +
4550 (num_fcntl_locks + num_flock_locks) *
4551 sizeof(struct ceph_filelock);
4552 rec.v2.flock_len = cpu_to_le32(struct_len);
4553
a33f6432 4554 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
121f22a1 4555
3469ed0d
YZ		 4556 if (struct_v >= 2)
4557 struct_len += sizeof(u64); /* snap_follows */
4558
121f22a1 4559 total_len += struct_len;
81c5a148
YZ		 4560
4561 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4562 err = send_reconnect_partial(recon_state);
4563 if (err)
4564 goto out_freeflocks;
4565 pagelist = recon_state->pagelist;
5ccedf1c 4566 }
121f22a1 4567
81c5a148
YZ		 4568 err = ceph_pagelist_reserve(pagelist, total_len);
4569 if (err)
4570 goto out_freeflocks;
4571
4572 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4573 if (recon_state->msg_version >= 3) {
4574 ceph_pagelist_encode_8(pagelist, struct_v);
4575 ceph_pagelist_encode_8(pagelist, 1);
4576 ceph_pagelist_encode_32(pagelist, struct_len);
121f22a1 4577 }
a33f6432 4578 ceph_pagelist_encode_string(pagelist, path, pathlen);
5ccedf1c
YZ		 4579 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4580 ceph_locks_to_pagelist(flocks, pagelist,
4581 num_fcntl_locks, num_flock_locks);
4582 if (struct_v >= 2)
4583 ceph_pagelist_encode_64(pagelist, snap_follows);
81c5a148 4584out_freeflocks:
39be95e9 4585 kfree(flocks);
3612abbd 4586 } else {
5ccedf1c 4587 err = ceph_pagelist_reserve(pagelist,
81c5a148
YZ		 4588 sizeof(u64) + sizeof(u32) +
4589 pathlen + sizeof(rec.v1));
a33f6432
YZ		 4590 if (err)
4591 goto out_err;
5ccedf1c 4592
81c5a148 4593 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
5ccedf1c
YZ		 4594 ceph_pagelist_encode_string(pagelist, path, pathlen);
4595 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
40819f6f 4596 }
44c99757 4597
5ccedf1c 4598out_err:
a33f6432
YZ		 4599 ceph_mdsc_free_path(path, pathlen);
4600 if (!err)
81c5a148
YZ		 4601 recon_state->nr_caps++;
4602 return err;
4603}
4604
4605static int encode_snap_realms(struct ceph_mds_client *mdsc,
4606 struct ceph_reconnect_state *recon_state)
4607{
4608 struct rb_node *p;
4609 struct ceph_pagelist *pagelist = recon_state->pagelist;
38d46409 4610 struct ceph_client *cl = mdsc->fsc->client;
81c5a148
YZ		 4611 int err = 0;
4612
4613 if (recon_state->msg_version >= 4) {
4614 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4615 if (err < 0)
4616 goto fail;
4617 }
4618
4619 /*
4620 * snaprealms. we provide mds with the ino, seq (version), and
4621 * parent for all of our realms. If the mds has any newer info,
4622 * it will tell us.
4623 */
4624 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4625 struct ceph_snap_realm *realm =
4626 rb_entry(p, struct ceph_snap_realm, node);
4627 struct ceph_mds_snaprealm_reconnect sr_rec;
4628
4629 if (recon_state->msg_version >= 4) {
4630 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4631 sizeof(sr_rec);
4632
4633 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4634 err = send_reconnect_partial(recon_state);
4635 if (err)
4636 goto fail;
4637 pagelist = recon_state->pagelist;
4638 }
4639
4640 err = ceph_pagelist_reserve(pagelist, need);
4641 if (err)
4642 goto fail;
4643
4644 ceph_pagelist_encode_8(pagelist, 1);
4645 ceph_pagelist_encode_8(pagelist, 1);
4646 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4647 }
4648
38d46409
XL		 4649 doutc(cl, " adding snap realm %llx seq %lld parent %llx\n",
4650 realm->ino, realm->seq, realm->parent_ino);
81c5a148
YZ		 4651 sr_rec.ino = cpu_to_le64(realm->ino);
4652 sr_rec.seq = cpu_to_le64(realm->seq);
4653 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4654
4655 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4656 if (err)
4657 goto fail;
4658
4659 recon_state->nr_realms++;
4660 }
4661fail:
93cea5be 4662 return err;
2f2dc053
SW		 4663}
4664
4665
4666/*
4667 * If an MDS fails and recovers, clients need to reconnect in order to
4668 * reestablish shared state. This includes all caps issued through
4669 * this session _and_ the snap_realm hierarchy. Because it's not
4670 * clear which snap realms the mds cares about, we send everything we
4671 * know about.. that ensures we'll then get any new info the
4672 * recovering MDS might have.
4673 *
4674 * This is a relatively heavyweight operation, but it's rare.
2f2dc053 4675 */
34b6c855
SW		 4676static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4677 struct ceph_mds_session *session)
2f2dc053 4678{
38d46409 4679 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4680 struct ceph_msg *reply;
34b6c855 4681 int mds = session->s_mds;
9abf82b8 4682 int err = -ENOMEM;
81c5a148
YZ		 4683 struct ceph_reconnect_state recon_state = {
4684 .session = session,
4685 };
c8a96a31 4686 LIST_HEAD(dispose);
2f2dc053 4687
38d46409 4688 pr_info_client(cl, "mds%d reconnect start\n", mds);
2f2dc053 4689
81c5a148
YZ		 4690 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4691 if (!recon_state.pagelist)
93cea5be 4692 goto fail_nopagelist;
93cea5be 4693
0d9c1ab3 4694 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
a79832f2 4695 if (!reply)
93cea5be 4696 goto fail_nomsg;
93cea5be 4697
d4846487
JL		 4698 xa_destroy(&session->s_delegated_inos);
4699
34b6c855
SW		 4700 mutex_lock(&session->s_mutex);
4701 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4702 session->s_seq = 0;
2f2dc053 4703
38d46409
XL		 4704 doutc(cl, "session %p state %s\n", session,
4705 ceph_session_state_name(session->s_state));
2f2dc053 4706
52d60f8e 4707 atomic_inc(&session->s_cap_gen);
99a9c273
YZ		 4708
4709 spin_lock(&session->s_cap_lock);
03f4fcb0
YZ		 4710 /* don't know if session is readonly */
4711 session->s_readonly = 0;
99a9c273
YZ		 4712 /*
4713 * notify __ceph_remove_cap() that we are composing cap reconnect.
4714 * If a cap get released before being added to the cap reconnect,
4715 * __ceph_remove_cap() should skip queuing cap release.
4716 */
4717 session->s_cap_reconnect = 1;
e01a5946 4718 /* drop old cap expires; we're about to reestablish that state */
c8a96a31
JL		 4719 detach_cap_releases(session, &dispose);
4720 spin_unlock(&session->s_cap_lock);
4721 dispose_cap_releases(mdsc, &dispose);
e01a5946 4722
5d23371f 4723 /* trim unused caps to reduce MDS's cache rejoin time */
c0bd50e2
YZ		 4724 if (mdsc->fsc->sb->s_root)
4725 shrink_dcache_parent(mdsc->fsc->sb->s_root);
5d23371f
YZ		 4726
4727 ceph_con_close(&session->s_con);
4728 ceph_con_open(&session->s_con,
4729 CEPH_ENTITY_TYPE_MDS, mds,
4730 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4731
4732 /* replay unsafe requests */
4733 replay_unsafe_requests(mdsc, session);
4734
81c5a148
YZ		 4735 ceph_early_kick_flushing_caps(mdsc, session);
4736
5d23371f
YZ		 4737 down_read(&mdsc->snap_rwsem);
4738
81c5a148
YZ		 4739 /* placeholder for nr_caps */
4740 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
93cea5be
SW		 4741 if (err)
4742 goto fail;
20cb34ae 4743
81c5a148 4744 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
121f22a1 4745 recon_state.msg_version = 3;
81c5a148
YZ		 4746 recon_state.allow_multi = true;
4747 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4748 recon_state.msg_version = 3;
4749 } else {
23c625ce 4750 recon_state.msg_version = 2;
81c5a148
YZ		 4751 }
4752 /* trsaverse this session's caps */
a25949b9 4753 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
2f2dc053 4754
99a9c273
YZ		 4755 spin_lock(&session->s_cap_lock);
4756 session->s_cap_reconnect = 0;
4757 spin_unlock(&session->s_cap_lock);
4758
81c5a148
YZ		 4759 if (err < 0)
4760 goto fail;
2f2dc053 4761
81c5a148
YZ		 4762 /* check if all realms can be encoded into current message */
4763 if (mdsc->num_snap_realms) {
4764 size_t total_len =
4765 recon_state.pagelist->length +
4766 mdsc->num_snap_realms *
4767 sizeof(struct ceph_mds_snaprealm_reconnect);
4768 if (recon_state.msg_version >= 4) {
4769 /* number of realms */
4770 total_len += sizeof(u32);
4771 /* version, compat_version and struct_len */
4772 total_len += mdsc->num_snap_realms *
4773 (2 * sizeof(u8) + sizeof(u32));
4774 }
4775 if (total_len > RECONNECT_MAX_SIZE) {
4776 if (!recon_state.allow_multi) {
4777 err = -ENOSPC;
4778 goto fail;
4779 }
4780 if (recon_state.nr_caps) {
4781 err = send_reconnect_partial(&recon_state);
4782 if (err)
4783 goto fail;
4784 }
4785 recon_state.msg_version = 5;
4786 }
2f2dc053 4787 }
2f2dc053 4788
81c5a148
YZ		 4789 err = encode_snap_realms(mdsc, &recon_state);
4790 if (err < 0)
4791 goto fail;
4792
4793 if (recon_state.msg_version >= 5) {
4794 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4795 if (err < 0)
4796 goto fail;
4797 }
44c99757 4798
81c5a148
YZ		 4799 if (recon_state.nr_caps || recon_state.nr_realms) {
4800 struct page *page =
4801 list_first_entry(&recon_state.pagelist->head,
4802 struct page, lru);
44c99757 4803 __le32 *addr = kmap_atomic(page);
81c5a148
YZ		 4804 if (recon_state.nr_caps) {
4805 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4806 *addr = cpu_to_le32(recon_state.nr_caps);
4807 } else if (recon_state.msg_version >= 4) {
4808 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4809 }
44c99757 4810 kunmap_atomic(addr);
ebf18f47 4811 }
44c99757 4812
81c5a148
YZ		 4813 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4814 if (recon_state.msg_version >= 4)
4815 reply->hdr.compat_version = cpu_to_le16(4);
e548e9b9 4816
81c5a148
YZ		 4817 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4818 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
e548e9b9 4819
2f2dc053
SW		 4820 ceph_con_send(&session->s_con, reply);
4821
9abf82b8
SW		 4822 mutex_unlock(&session->s_mutex);
4823
4824 mutex_lock(&mdsc->mutex);
4825 __wake_requests(mdsc, &session->s_waiting);
4826 mutex_unlock(&mdsc->mutex);
4827
2f2dc053 4828 up_read(&mdsc->snap_rwsem);
81c5a148 4829 ceph_pagelist_release(recon_state.pagelist);
2f2dc053
SW		 4830 return;
4831
93cea5be 4832fail:
2f2dc053 4833 ceph_msg_put(reply);
9abf82b8
SW		 4834 up_read(&mdsc->snap_rwsem);
4835 mutex_unlock(&session->s_mutex);
93cea5be 4836fail_nomsg:
81c5a148 4837 ceph_pagelist_release(recon_state.pagelist);
93cea5be 4838fail_nopagelist:
38d46409
XL		 4839 pr_err_client(cl, "error %d preparing reconnect for mds%d\n",
4840 err, mds);
9abf82b8 4841 return;
2f2dc053
SW		 4842}
4843
4844
4845/*
4846 * compare old and new mdsmaps, kicking requests
4847 * and closing out old connections as necessary
4848 *
4849 * called under mdsc->mutex.
4850 */
4851static void check_new_map(struct ceph_mds_client *mdsc,
4852 struct ceph_mdsmap *newmap,
4853 struct ceph_mdsmap *oldmap)
4854{
d517b398 4855 int i, j, err;
2f2dc053
SW		 4856 int oldstate, newstate;
4857 struct ceph_mds_session *s;
d517b398 4858 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
38d46409 4859 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053 4860
38d46409 4861 doutc(cl, "new %u old %u\n", newmap->m_epoch, oldmap->m_epoch);
2f2dc053 4862
d517b398
XL		 4863 if (newmap->m_info) {
4864 for (i = 0; i < newmap->possible_max_rank; i++) {
4865 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4866 set_bit(newmap->m_info[i].export_targets[j], targets);
4867 }
4868 }
4869
b38c9eb4 4870 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
d37b1d99 4871 if (!mdsc->sessions[i])
2f2dc053
SW		 4872 continue;
4873 s = mdsc->sessions[i];
4874 oldstate = ceph_mdsmap_get_state(oldmap, i);
4875 newstate = ceph_mdsmap_get_state(newmap, i);
4876
38d46409
XL		 4877 doutc(cl, "mds%d state %s%s -> %s%s (session %s)\n",
4878 i, ceph_mds_state_name(oldstate),
4879 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4880 ceph_mds_state_name(newstate),
4881 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4882 ceph_session_state_name(s->s_state));
2f2dc053 4883
b38c9eb4 4884 if (i >= newmap->possible_max_rank) {
6f0f597b 4885 /* force close session for stopped mds */
5b3248c6 4886 ceph_get_mds_session(s);
6f0f597b
YZ		 4887 __unregister_session(mdsc, s);
4888 __wake_requests(mdsc, &s->s_waiting);
4889 mutex_unlock(&mdsc->mutex);
2827528d 4890
6f0f597b
YZ		 4891 mutex_lock(&s->s_mutex);
4892 cleanup_session_requests(mdsc, s);
4893 remove_session_caps(s);
4894 mutex_unlock(&s->s_mutex);
2827528d 4895
6f0f597b 4896 ceph_put_mds_session(s);
2827528d 4897
6f0f597b
YZ		 4898 mutex_lock(&mdsc->mutex);
4899 kick_requests(mdsc, i);
4900 continue;
4901 }
4902
4903 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4904 ceph_mdsmap_get_addr(newmap, i),
4905 sizeof(struct ceph_entity_addr))) {
4906 /* just close it */
4907 mutex_unlock(&mdsc->mutex);
4908 mutex_lock(&s->s_mutex);
4909 mutex_lock(&mdsc->mutex);
4910 ceph_con_close(&s->s_con);
4911 mutex_unlock(&s->s_mutex);
4912 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2f2dc053
SW		 4913 } else if (oldstate == newstate) {
4914 continue; /* nothing new with this mds */
4915 }
4916
4917 /*
4918 * send reconnect?
4919 */
4920 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
34b6c855
SW		 4921 newstate >= CEPH_MDS_STATE_RECONNECT) {
4922 mutex_unlock(&mdsc->mutex);
d517b398 4923 clear_bit(i, targets);
34b6c855
SW		 4924 send_mds_reconnect(mdsc, s);
4925 mutex_lock(&mdsc->mutex);
4926 }
2f2dc053
SW		 4927
4928 /*
29790f26 4929 * kick request on any mds that has gone active.
2f2dc053
SW		 4930 */
4931 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4932 newstate >= CEPH_MDS_STATE_ACTIVE) {
29790f26
SW		 4933 if (oldstate != CEPH_MDS_STATE_CREATING &&
4934 oldstate != CEPH_MDS_STATE_STARTING)
38d46409
XL		 4935 pr_info_client(cl, "mds%d recovery completed\n",
4936 s->s_mds);
29790f26 4937 kick_requests(mdsc, i);
ea8412b2 4938 mutex_unlock(&mdsc->mutex);
829ad4db 4939 mutex_lock(&s->s_mutex);
ea8412b2 4940 mutex_lock(&mdsc->mutex);
2f2dc053 4941 ceph_kick_flushing_caps(mdsc, s);
829ad4db 4942 mutex_unlock(&s->s_mutex);
d2f8bb27 4943 wake_up_session_caps(s, RECONNECT);
2f2dc053
SW		 4944 }
4945 }
cb170a22 4946
d517b398
XL		 4947 /*
4948 * Only open and reconnect sessions that don't exist yet.
4949 */
4950 for (i = 0; i < newmap->possible_max_rank; i++) {
4951 /*
4952 * In case the import MDS is crashed just after
4953 * the EImportStart journal is flushed, so when
4954 * a standby MDS takes over it and is replaying
4955 * the EImportStart journal the new MDS daemon
4956 * will wait the client to reconnect it, but the
4957 * client may never register/open the session yet.
4958 *
4959 * Will try to reconnect that MDS daemon if the
4960 * rank number is in the export targets array and
4961 * is the up:reconnect state.
4962 */
4963 newstate = ceph_mdsmap_get_state(newmap, i);
4964 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
4965 continue;
4966
4967 /*
4968 * The session maybe registered and opened by some
4969 * requests which were choosing random MDSes during
4970 * the mdsc->mutex's unlock/lock gap below in rare
4971 * case. But the related MDS daemon will just queue
4972 * that requests and be still waiting for the client's
4973 * reconnection request in up:reconnect state.
4974 */
4975 s = __ceph_lookup_mds_session(mdsc, i);
4976 if (likely(!s)) {
4977 s = __open_export_target_session(mdsc, i);
4978 if (IS_ERR(s)) {
4979 err = PTR_ERR(s);
38d46409
XL		 4980 pr_err_client(cl,
4981 "failed to open export target session, err %d\n",
4982 err);
d517b398
XL		 4983 continue;
4984 }
4985 }
38d46409 4986 doutc(cl, "send reconnect to export target mds.%d\n", i);
d517b398
XL		 4987 mutex_unlock(&mdsc->mutex);
4988 send_mds_reconnect(mdsc, s);
4989 ceph_put_mds_session(s);
4990 mutex_lock(&mdsc->mutex);
4991 }
4992
b38c9eb4 4993 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
cb170a22
SW		 4994 s = mdsc->sessions[i];
4995 if (!s)
4996 continue;
4997 if (!ceph_mdsmap_is_laggy(newmap, i))
4998 continue;
4999 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5000 s->s_state == CEPH_MDS_SESSION_HUNG ||
5001 s->s_state == CEPH_MDS_SESSION_CLOSING) {
38d46409 5002 doutc(cl, " connecting to export targets of laggy mds%d\n", i);
cb170a22
SW		 5003 __open_export_target_sessions(mdsc, s);
5004 }
5005 }
2f2dc053
SW		 5006}
5007
5008
5009
5010/*
5011 * leases
5012 */
5013
5014/*
5015 * caller must hold session s_mutex, dentry->d_lock
5016 */
5017void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
5018{
5019 struct ceph_dentry_info *di = ceph_dentry(dentry);
5020
5021 ceph_put_mds_session(di->lease_session);
5022 di->lease_session = NULL;
5023}
5024
2600d2dd
SW		 5025static void handle_lease(struct ceph_mds_client *mdsc,
5026 struct ceph_mds_session *session,
5027 struct ceph_msg *msg)
2f2dc053 5028{
38d46409 5029 struct ceph_client *cl = mdsc->fsc->client;
3d14c5d2 5030 struct super_block *sb = mdsc->fsc->sb;
2f2dc053 5031 struct inode *inode;
2f2dc053
SW		 5032 struct dentry *parent, *dentry;
5033 struct ceph_dentry_info *di;
2600d2dd 5034 int mds = session->s_mds;
2f2dc053 5035 struct ceph_mds_lease *h = msg->front.iov_base;
1e5ea23d 5036 u32 seq;
2f2dc053 5037 struct ceph_vino vino;
2f2dc053
SW		 5038 struct qstr dname;
5039 int release = 0;
5040
38d46409 5041 doutc(cl, "from mds%d\n", mds);
2f2dc053 5042
e3dfcab2
XL		 5043 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
5044 return;
5045
2f2dc053
SW		 5046 /* decode */
5047 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
5048 goto bad;
5049 vino.ino = le64_to_cpu(h->ino);
5050 vino.snap = CEPH_NOSNAP;
1e5ea23d 5051 seq = le32_to_cpu(h->seq);
0fcf6c02
YZ		 5052 dname.len = get_unaligned_le32(h + 1);
5053 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
2f2dc053 5054 goto bad;
0fcf6c02 5055 dname.name = (void *)(h + 1) + sizeof(u32);
2f2dc053 5056
2f2dc053
SW		 5057 /* lookup inode */
5058 inode = ceph_find_inode(sb, vino);
38d46409
XL		 5059 doutc(cl, "%s, ino %llx %p %.*s\n", ceph_lease_op_name(h->action),
5060 vino.ino, inode, dname.len, dname.name);
6cd3bcad
YZ		 5061
5062 mutex_lock(&session->s_mutex);
d37b1d99 5063 if (!inode) {
38d46409 5064 doutc(cl, "no inode %llx\n", vino.ino);
2f2dc053
SW		 5065 goto release;
5066 }
2f2dc053
SW		 5067
5068 /* dentry */
5069 parent = d_find_alias(inode);
5070 if (!parent) {
38d46409 5071 doutc(cl, "no parent dentry on inode %p\n", inode);
2f2dc053
SW		 5072 WARN_ON(1);
5073 goto release; /* hrm... */
5074 }
8387ff25 5075 dname.hash = full_name_hash(parent, dname.name, dname.len);
2f2dc053
SW		 5076 dentry = d_lookup(parent, &dname);
5077 dput(parent);
5078 if (!dentry)
5079 goto release;
5080
5081 spin_lock(&dentry->d_lock);
5082 di = ceph_dentry(dentry);
5083 switch (h->action) {
5084 case CEPH_MDS_LEASE_REVOKE:
3d8eb7a9 5085 if (di->lease_session == session) {
1e5ea23d
SW		 5086 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
5087 h->seq = cpu_to_le32(di->lease_seq);
2f2dc053
SW		 5088 __ceph_mdsc_drop_dentry_lease(dentry);
5089 }
5090 release = 1;
5091 break;
5092
5093 case CEPH_MDS_LEASE_RENEW:
3d8eb7a9 5094 if (di->lease_session == session &&
52d60f8e 5095 di->lease_gen == atomic_read(&session->s_cap_gen) &&
2f2dc053
SW		 5096 di->lease_renew_from &&
5097 di->lease_renew_after == 0) {
5098 unsigned long duration =
3563dbdd 5099 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
2f2dc053 5100
1e5ea23d 5101 di->lease_seq = seq;
9b16f03c 5102 di->time = di->lease_renew_from + duration;
2f2dc053
SW		 5103 di->lease_renew_after = di->lease_renew_from +
5104 (duration >> 1);
5105 di->lease_renew_from = 0;
5106 }
5107 break;
5108 }
5109 spin_unlock(&dentry->d_lock);
5110 dput(dentry);
5111
5112 if (!release)
5113 goto out;
5114
5115release:
5116 /* let's just reuse the same message */
5117 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
5118 ceph_msg_get(msg);
5119 ceph_con_send(&session->s_con, msg);
5120
5121out:
2f2dc053 5122 mutex_unlock(&session->s_mutex);
23c2c76e 5123 iput(inode);
e3dfcab2
XL		 5124
5125 ceph_dec_mds_stopping_blocker(mdsc);
2f2dc053
SW		 5126 return;
5127
5128bad:
e3dfcab2
XL		 5129 ceph_dec_mds_stopping_blocker(mdsc);
5130
38d46409 5131 pr_err_client(cl, "corrupt lease message\n");
9ec7cab1 5132 ceph_msg_dump(msg);
2f2dc053
SW		 5133}
5134
5135void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2f2dc053
SW		 5136 struct dentry *dentry, char action,
5137 u32 seq)
5138{
38d46409 5139 struct ceph_client *cl = session->s_mdsc->fsc->client;
2f2dc053
SW		 5140 struct ceph_msg *msg;
5141 struct ceph_mds_lease *lease;
8f2a98ef
YZ		 5142 struct inode *dir;
5143 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
2f2dc053 5144
38d46409
XL		 5145 doutc(cl, "identry %p %s to mds%d\n", dentry, ceph_lease_op_name(action),
5146 session->s_mds);
2f2dc053 5147
b61c2763 5148 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
a79832f2 5149 if (!msg)
2f2dc053
SW		 5150 return;
5151 lease = msg->front.iov_base;
5152 lease->action = action;
2f2dc053 5153 lease->seq = cpu_to_le32(seq);
2f2dc053 5154
8f2a98ef
YZ		 5155 spin_lock(&dentry->d_lock);
5156 dir = d_inode(dentry->d_parent);
5157 lease->ino = cpu_to_le64(ceph_ino(dir));
5158 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5159
5160 put_unaligned_le32(dentry->d_name.len, lease + 1);
5161 memcpy((void *)(lease + 1) + 4,
5162 dentry->d_name.name, dentry->d_name.len);
5163 spin_unlock(&dentry->d_lock);
2f2dc053
SW		 5164
5165 ceph_con_send(&session->s_con, msg);
5166}
5167
2f2dc053 5168/*
59b312f3 5169 * lock unlock the session, to wait ongoing session activities
2f2dc053 5170 */
59b312f3 5171static void lock_unlock_session(struct ceph_mds_session *s)
2f2dc053 5172{
59b312f3
XL		 5173 mutex_lock(&s->s_mutex);
5174 mutex_unlock(&s->s_mutex);
2f2dc053
SW		 5175}
5176
131d7eb4
YZ		 5177static void maybe_recover_session(struct ceph_mds_client *mdsc)
5178{
38d46409 5179 struct ceph_client *cl = mdsc->fsc->client;
131d7eb4
YZ		 5180 struct ceph_fs_client *fsc = mdsc->fsc;
5181
5182 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5183 return;
2f2dc053 5184
131d7eb4
YZ		 5185 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5186 return;
5187
0b98acd6 5188 if (!READ_ONCE(fsc->blocklisted))
131d7eb4
YZ		 5189 return;
5190
38d46409 5191 pr_info_client(cl, "auto reconnect after blocklisted\n");
131d7eb4
YZ		 5192 ceph_force_reconnect(fsc->sb);
5193}
2f2dc053 5194
3e699bd8
XL		 5195bool check_session_state(struct ceph_mds_session *s)
5196{
38d46409
XL		 5197 struct ceph_client *cl = s->s_mdsc->fsc->client;
5198
62575e27
JL		 5199 switch (s->s_state) {
5200 case CEPH_MDS_SESSION_OPEN:
5201 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3e699bd8 5202 s->s_state = CEPH_MDS_SESSION_HUNG;
38d46409 5203 pr_info_client(cl, "mds%d hung\n", s->s_mds);
3e699bd8 5204 }
62575e27
JL		 5205 break;
5206 case CEPH_MDS_SESSION_CLOSING:
62575e27
JL		 5207 case CEPH_MDS_SESSION_NEW:
5208 case CEPH_MDS_SESSION_RESTARTING:
5209 case CEPH_MDS_SESSION_CLOSED:
5210 case CEPH_MDS_SESSION_REJECTED:
3e699bd8 5211 return false;
62575e27 5212 }
3e699bd8
XL		 5213
5214 return true;
5215}
5216
62575e27
JL		 5217/*
5218 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5219 * then we need to retransmit that request.
5220 */
5221void inc_session_sequence(struct ceph_mds_session *s)
5222{
38d46409
XL		 5223 struct ceph_client *cl = s->s_mdsc->fsc->client;
5224
62575e27
JL		 5225 lockdep_assert_held(&s->s_mutex);
5226
5227 s->s_seq++;
5228
5229 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5230 int ret;
5231
38d46409 5232 doutc(cl, "resending session close request for mds%d\n", s->s_mds);
62575e27
JL		 5233 ret = request_close_session(s);
5234 if (ret < 0)
38d46409
XL		 5235 pr_err_client(cl, "unable to close session to mds%d: %d\n",
5236 s->s_mds, ret);
62575e27
JL		 5237 }
5238}
5239
2f2dc053 5240/*
bf2ba432
LH		 5241 * delayed work -- periodically trim expired leases, renew caps with mds. If
5242 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5243 * workqueue delay value of 5 secs will be used.
2f2dc053 5244 */
bf2ba432 5245static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
2f2dc053 5246{
bf2ba432
LH		 5247 unsigned long max_delay = HZ * 5;
5248
5249 /* 5 secs default delay */
5250 if (!delay || (delay > max_delay))
5251 delay = max_delay;
5252 schedule_delayed_work(&mdsc->delayed_work,
5253 round_jiffies_relative(delay));
2f2dc053
SW		 5254}
5255
5256static void delayed_work(struct work_struct *work)
5257{
2f2dc053
SW		 5258 struct ceph_mds_client *mdsc =
5259 container_of(work, struct ceph_mds_client, delayed_work.work);
bf2ba432 5260 unsigned long delay;
2f2dc053
SW		 5261 int renew_interval;
5262 int renew_caps;
bf2ba432 5263 int i;
2f2dc053 5264
38d46409 5265 doutc(mdsc->fsc->client, "mdsc delayed_work\n");
75c9627e 5266
e7e607bd 5267 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
fa996773
XL		 5268 return;
5269
2f2dc053
SW		 5270 mutex_lock(&mdsc->mutex);
5271 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5272 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5273 mdsc->last_renew_caps);
5274 if (renew_caps)
5275 mdsc->last_renew_caps = jiffies;
5276
5277 for (i = 0; i < mdsc->max_sessions; i++) {
5278 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
d37b1d99 5279 if (!s)
2f2dc053 5280 continue;
3e699bd8
XL		 5281
5282 if (!check_session_state(s)) {
2f2dc053
SW		 5283 ceph_put_mds_session(s);
5284 continue;
5285 }
5286 mutex_unlock(&mdsc->mutex);
5287
5288 mutex_lock(&s->s_mutex);
5289 if (renew_caps)
5290 send_renew_caps(mdsc, s);
5291 else
5292 ceph_con_keepalive(&s->s_con);
aab53dd9
SW		 5293 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5294 s->s_state == CEPH_MDS_SESSION_HUNG)
3d7ded4d 5295 ceph_send_cap_releases(mdsc, s);
2f2dc053
SW		 5296 mutex_unlock(&s->s_mutex);
5297 ceph_put_mds_session(s);
5298
5299 mutex_lock(&mdsc->mutex);
5300 }
5301 mutex_unlock(&mdsc->mutex);
5302
bf2ba432 5303 delay = ceph_check_delayed_caps(mdsc);
37c4efc1
YZ		 5304
5305 ceph_queue_cap_reclaim_work(mdsc);
5306
5307 ceph_trim_snapid_map(mdsc);
5308
131d7eb4
YZ		 5309 maybe_recover_session(mdsc);
5310
bf2ba432 5311 schedule_delayed(mdsc, delay);
2f2dc053
SW		 5312}
5313
3d14c5d2 5314int ceph_mdsc_init(struct ceph_fs_client *fsc)
2f2dc053 5315
2f2dc053 5316{
3d14c5d2 5317 struct ceph_mds_client *mdsc;
f9009efa 5318 int err;
3d14c5d2
YS		 5319
5320 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5321 if (!mdsc)
5322 return -ENOMEM;
5323 mdsc->fsc = fsc;
2f2dc053
SW		 5324 mutex_init(&mdsc->mutex);
5325 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
d37b1d99 5326 if (!mdsc->mdsmap) {
f9009efa
XL		 5327 err = -ENOMEM;
5328 goto err_mdsc;
fb3101b6 5329 }
2d06eeb8 5330
2f2dc053 5331 init_completion(&mdsc->safe_umount_waiters);
e3dfcab2
XL		 5332 spin_lock_init(&mdsc->stopping_lock);
5333 atomic_set(&mdsc->stopping_blockers, 0);
5334 init_completion(&mdsc->stopping_waiter);
f3c60c59 5335 init_waitqueue_head(&mdsc->session_close_wq);
2f2dc053 5336 INIT_LIST_HEAD(&mdsc->waiting_for_map);
0c44a8e0
LH		 5337 mdsc->quotarealms_inodes = RB_ROOT;
5338 mutex_init(&mdsc->quotarealms_inodes_mutex);
2f2dc053 5339 init_rwsem(&mdsc->snap_rwsem);
a105f00c 5340 mdsc->snap_realms = RB_ROOT;
2f2dc053
SW		 5341 INIT_LIST_HEAD(&mdsc->snap_empty);
5342 spin_lock_init(&mdsc->snap_empty_lock);
44ca18f2 5343 mdsc->request_tree = RB_ROOT;
2f2dc053
SW		 5344 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5345 mdsc->last_renew_caps = jiffies;
5346 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3a3430af 5347 INIT_LIST_HEAD(&mdsc->cap_wait_list);
2f2dc053
SW		 5348 spin_lock_init(&mdsc->cap_delay_lock);
5349 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5350 spin_lock_init(&mdsc->snap_flush_lock);
553adfd9 5351 mdsc->last_cap_flush_tid = 1;
e4500b5e 5352 INIT_LIST_HEAD(&mdsc->cap_flush_list);
db354052 5353 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
2f2dc053
SW		 5354 spin_lock_init(&mdsc->cap_dirty_lock);
5355 init_waitqueue_head(&mdsc->cap_flushing_wq);
37c4efc1 5356 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
f9009efa
XL		 5357 err = ceph_metric_init(&mdsc->metric);
5358 if (err)
5359 goto err_mdsmap;
37c4efc1
YZ		 5360
5361 spin_lock_init(&mdsc->dentry_list_lock);
5362 INIT_LIST_HEAD(&mdsc->dentry_leases);
5363 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
2d06eeb8 5364
37151668 5365 ceph_caps_init(mdsc);
fe33032d 5366 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
37151668 5367
75c9627e
YZ		 5368 spin_lock_init(&mdsc->snapid_map_lock);
5369 mdsc->snapid_map_tree = RB_ROOT;
5370 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5371
10183a69
YZ		 5372 init_rwsem(&mdsc->pool_perm_rwsem);
5373 mdsc->pool_perm_tree = RB_ROOT;
5374
dfeb84d4
YZ		 5375 strscpy(mdsc->nodename, utsname()->nodename,
5376 sizeof(mdsc->nodename));
a7caa88f
XL		 5377
5378 fsc->mdsc = mdsc;
5f44f142 5379 return 0;
f9009efa
XL		 5380
5381err_mdsmap:
5382 kfree(mdsc->mdsmap);
5383err_mdsc:
5384 kfree(mdsc);
5385 return err;
2f2dc053
SW		 5386}
5387
5388/*
5389 * Wait for safe replies on open mds requests. If we time out, drop
5390 * all requests from the tree to avoid dangling dentry refs.
5391 */
5392static void wait_requests(struct ceph_mds_client *mdsc)
5393{
38d46409 5394 struct ceph_client *cl = mdsc->fsc->client;
a319bf56 5395 struct ceph_options *opts = mdsc->fsc->client->options;
2f2dc053 5396 struct ceph_mds_request *req;
2f2dc053
SW		 5397
5398 mutex_lock(&mdsc->mutex);
44ca18f2 5399 if (__get_oldest_req(mdsc)) {
2f2dc053 5400 mutex_unlock(&mdsc->mutex);
44ca18f2 5401
38d46409 5402 doutc(cl, "waiting for requests\n");
2f2dc053 5403 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
a319bf56 5404 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5405
5406 /* tear down remaining requests */
44ca18f2
SW		 5407 mutex_lock(&mdsc->mutex);
5408 while ((req = __get_oldest_req(mdsc))) {
38d46409 5409 doutc(cl, "timed out on tid %llu\n", req->r_tid);
428138c9 5410 list_del_init(&req->r_wait);
44ca18f2 5411 __unregister_request(mdsc, req);
2f2dc053
SW		 5412 }
5413 }
5414 mutex_unlock(&mdsc->mutex);
38d46409 5415 doutc(cl, "done\n");
2f2dc053
SW		 5416}
5417
d095559c
XL		 5418void send_flush_mdlog(struct ceph_mds_session *s)
5419{
38d46409 5420 struct ceph_client *cl = s->s_mdsc->fsc->client;
d095559c
XL		 5421 struct ceph_msg *msg;
5422
5423 /*
5424 * Pre-luminous MDS crashes when it sees an unknown session request
5425 */
5426 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5427 return;
5428
5429 mutex_lock(&s->s_mutex);
38d46409
XL		 5430 doutc(cl, "request mdlog flush to mds%d (%s)s seq %lld\n",
5431 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5432 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5433 s->s_seq);
5434 if (!msg) {
38d46409
XL		 5435 pr_err_client(cl, "failed to request mdlog flush to mds%d (%s) seq %lld\n",
5436 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
d095559c
XL		 5437 } else {
5438 ceph_con_send(&s->s_con, msg);
5439 }
5440 mutex_unlock(&s->s_mutex);
5441}
5442
2f2dc053
SW		 5443/*
5444 * called before mount is ro, and before dentries are torn down.
5445 * (hmm, does this still race with new lookups?)
5446 */
5447void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5448{
38d46409 5449 doutc(mdsc->fsc->client, "begin\n");
e7e607bd 5450 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
2f2dc053 5451
d095559c 5452 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
59b312f3 5453 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
afcdaea3 5454 ceph_flush_dirty_caps(mdsc);
2f2dc053 5455 wait_requests(mdsc);
17c688c3
SW		 5456
5457 /*
5458 * wait for reply handlers to drop their request refs and
5459 * their inode/dcache refs
5460 */
5461 ceph_msgr_flush();
0c44a8e0
LH		 5462
5463 ceph_cleanup_quotarealms_inodes(mdsc);
38d46409 5464 doutc(mdsc->fsc->client, "done\n");
2f2dc053
SW		 5465}
5466
5467/*
1b2ba3c5 5468 * flush the mdlog and wait for all write mds requests to flush.
2f2dc053 5469 */
1b2ba3c5
XL		 5470static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5471 u64 want_tid)
2f2dc053 5472{
38d46409 5473 struct ceph_client *cl = mdsc->fsc->client;
80fc7314 5474 struct ceph_mds_request *req = NULL, *nextreq;
1b2ba3c5 5475 struct ceph_mds_session *last_session = NULL;
44ca18f2 5476 struct rb_node *n;
2f2dc053
SW		 5477
5478 mutex_lock(&mdsc->mutex);
38d46409 5479 doutc(cl, "want %lld\n", want_tid);
80fc7314 5480restart:
44ca18f2
SW		 5481 req = __get_oldest_req(mdsc);
5482 while (req && req->r_tid <= want_tid) {
80fc7314
SW		 5483 /* find next request */
5484 n = rb_next(&req->r_node);
5485 if (n)
5486 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5487 else
5488 nextreq = NULL;
e8a7b8b1
YZ		 5489 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5490 (req->r_op & CEPH_MDS_OP_WRITE)) {
1b2ba3c5
XL		 5491 struct ceph_mds_session *s = req->r_session;
5492
5493 if (!s) {
5494 req = nextreq;
5495 continue;
5496 }
5497
44ca18f2
SW		 5498 /* write op */
5499 ceph_mdsc_get_request(req);
80fc7314
SW		 5500 if (nextreq)
5501 ceph_mdsc_get_request(nextreq);
1b2ba3c5 5502 s = ceph_get_mds_session(s);
44ca18f2 5503 mutex_unlock(&mdsc->mutex);
1b2ba3c5
XL		 5504
5505 /* send flush mdlog request to MDS */
5506 if (last_session != s) {
5507 send_flush_mdlog(s);
5508 ceph_put_mds_session(last_session);
5509 last_session = s;
5510 } else {
5511 ceph_put_mds_session(s);
5512 }
38d46409
XL		 5513 doutc(cl, "wait on %llu (want %llu)\n",
5514 req->r_tid, want_tid);
44ca18f2 5515 wait_for_completion(&req->r_safe_completion);
1b2ba3c5 5516
44ca18f2 5517 mutex_lock(&mdsc->mutex);
44ca18f2 5518 ceph_mdsc_put_request(req);
80fc7314
SW		 5519 if (!nextreq)
5520 break; /* next dne before, so we're done! */
5521 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5522 /* next request was removed from tree */
5523 ceph_mdsc_put_request(nextreq);
5524 goto restart;
5525 }
5526 ceph_mdsc_put_request(nextreq); /* won't go away */
44ca18f2 5527 }
80fc7314 5528 req = nextreq;
2f2dc053
SW		 5529 }
5530 mutex_unlock(&mdsc->mutex);
1b2ba3c5 5531 ceph_put_mds_session(last_session);
38d46409 5532 doutc(cl, "done\n");
2f2dc053
SW		 5533}
5534
5535void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5536{
38d46409 5537 struct ceph_client *cl = mdsc->fsc->client;
0e294387 5538 u64 want_tid, want_flush;
2f2dc053 5539
50c9132d 5540 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
56b7cf95
SW		 5541 return;
5542
38d46409 5543 doutc(cl, "sync\n");
2f2dc053
SW		 5544 mutex_lock(&mdsc->mutex);
5545 want_tid = mdsc->last_tid;
2f2dc053 5546 mutex_unlock(&mdsc->mutex);
2f2dc053 5547
afcdaea3 5548 ceph_flush_dirty_caps(mdsc);
d3383a8e 5549 spin_lock(&mdsc->cap_dirty_lock);
8310b089 5550 want_flush = mdsc->last_cap_flush_tid;
c8799fc4
YZ		 5551 if (!list_empty(&mdsc->cap_flush_list)) {
5552 struct ceph_cap_flush *cf =
5553 list_last_entry(&mdsc->cap_flush_list,
5554 struct ceph_cap_flush, g_list);
5555 cf->wake = true;
5556 }
d3383a8e
YZ		 5557 spin_unlock(&mdsc->cap_dirty_lock);
5558
38d46409 5559 doutc(cl, "sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2f2dc053 5560
1b2ba3c5 5561 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
0e294387 5562 wait_caps_flush(mdsc, want_flush);
2f2dc053
SW		 5563}
5564
f3c60c59
SW		 5565/*
5566 * true if all sessions are closed, or we force unmount
5567 */
fcff415c 5568static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
f3c60c59 5569{
52953d55 5570 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
f3c60c59 5571 return true;
fcff415c 5572 return atomic_read(&mdsc->num_sessions) <= skipped;
f3c60c59 5573}
2f2dc053
SW		 5574
5575/*
a68e564a 5576 * called after sb is ro or when metadata corrupted.
2f2dc053
SW		 5577 */
5578void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5579{
a319bf56 5580 struct ceph_options *opts = mdsc->fsc->client->options;
38d46409 5581 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5582 struct ceph_mds_session *session;
5583 int i;
fcff415c 5584 int skipped = 0;
2f2dc053 5585
38d46409 5586 doutc(cl, "begin\n");
2f2dc053 5587
2f2dc053 5588 /* close sessions */
f3c60c59
SW		 5589 mutex_lock(&mdsc->mutex);
5590 for (i = 0; i < mdsc->max_sessions; i++) {
5591 session = __ceph_lookup_mds_session(mdsc, i);
5592 if (!session)
5593 continue;
2f2dc053 5594 mutex_unlock(&mdsc->mutex);
f3c60c59 5595 mutex_lock(&session->s_mutex);
fcff415c
YZ		 5596 if (__close_session(mdsc, session) <= 0)
5597 skipped++;
f3c60c59
SW		 5598 mutex_unlock(&session->s_mutex);
5599 ceph_put_mds_session(session);
2f2dc053
SW		 5600 mutex_lock(&mdsc->mutex);
5601 }
f3c60c59
SW		 5602 mutex_unlock(&mdsc->mutex);
5603
38d46409 5604 doutc(cl, "waiting for sessions to close\n");
fcff415c
YZ		 5605 wait_event_timeout(mdsc->session_close_wq,
5606 done_closing_sessions(mdsc, skipped),
a319bf56 5607 ceph_timeout_jiffies(opts->mount_timeout));
2f2dc053
SW		 5608
5609 /* tear down remaining sessions */
f3c60c59 5610 mutex_lock(&mdsc->mutex);
2f2dc053
SW		 5611 for (i = 0; i < mdsc->max_sessions; i++) {
5612 if (mdsc->sessions[i]) {
5b3248c6 5613 session = ceph_get_mds_session(mdsc->sessions[i]);
2600d2dd 5614 __unregister_session(mdsc, session);
2f2dc053
SW		 5615 mutex_unlock(&mdsc->mutex);
5616 mutex_lock(&session->s_mutex);
5617 remove_session_caps(session);
5618 mutex_unlock(&session->s_mutex);
5619 ceph_put_mds_session(session);
5620 mutex_lock(&mdsc->mutex);
5621 }
5622 }
2f2dc053 5623 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2f2dc053
SW		 5624 mutex_unlock(&mdsc->mutex);
5625
75c9627e 5626 ceph_cleanup_snapid_map(mdsc);
5ed91587 5627 ceph_cleanup_global_and_empty_realms(mdsc);
2f2dc053 5628
37c4efc1 5629 cancel_work_sync(&mdsc->cap_reclaim_work);
2f2dc053
SW		 5630 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5631
38d46409 5632 doutc(cl, "done\n");
2f2dc053
SW		 5633}
5634
48fec5d0
YZ		 5635void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5636{
5637 struct ceph_mds_session *session;
5638 int mds;
5639
38d46409 5640 doutc(mdsc->fsc->client, "force umount\n");
48fec5d0
YZ		 5641
5642 mutex_lock(&mdsc->mutex);
5643 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5644 session = __ceph_lookup_mds_session(mdsc, mds);
5645 if (!session)
5646 continue;
d468e729
YZ		 5647
5648 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5649 __unregister_session(mdsc, session);
5650 __wake_requests(mdsc, &session->s_waiting);
48fec5d0 5651 mutex_unlock(&mdsc->mutex);
d468e729 5652
48fec5d0
YZ		 5653 mutex_lock(&session->s_mutex);
5654 __close_session(mdsc, session);
5655 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5656 cleanup_session_requests(mdsc, session);
5657 remove_session_caps(session);
5658 }
5659 mutex_unlock(&session->s_mutex);
5660 ceph_put_mds_session(session);
d468e729 5661
48fec5d0
YZ		 5662 mutex_lock(&mdsc->mutex);
5663 kick_requests(mdsc, mds);
5664 }
5665 __wake_requests(mdsc, &mdsc->waiting_for_map);
5666 mutex_unlock(&mdsc->mutex);
5667}
5668
3d14c5d2 5669static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2f2dc053 5670{
38d46409 5671 doutc(mdsc->fsc->client, "stop\n");
fa996773
XL		 5672 /*
5673 * Make sure the delayed work stopped before releasing
5674 * the resources.
5675 *
5676 * Because the cancel_delayed_work_sync() will only
5677 * guarantee that the work finishes executing. But the
5678 * delayed work will re-arm itself again after that.
5679 */
5680 flush_delayed_work(&mdsc->delayed_work);
5681
2f2dc053
SW		 5682 if (mdsc->mdsmap)
5683 ceph_mdsmap_destroy(mdsc->mdsmap);
5684 kfree(mdsc->sessions);
37151668 5685 ceph_caps_finalize(mdsc);
10183a69 5686 ceph_pool_perm_destroy(mdsc);
2f2dc053
SW		 5687}
5688
3d14c5d2
YS		 5689void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
5690{
5691 struct ceph_mds_client *mdsc = fsc->mdsc;
38d46409 5692 doutc(fsc->client, "%p\n", mdsc);
ef550f6f 5693
50c55aec
CX		 5694 if (!mdsc)
5695 return;
5696
ef550f6f
SW		 5697 /* flush out any connection work with references to us */
5698 ceph_msgr_flush();
5699
62a65f36
YZ		 5700 ceph_mdsc_stop(mdsc);
5701
f9009efa
XL		 5702 ceph_metric_destroy(&mdsc->metric);
5703
3d14c5d2
YS		 5704 fsc->mdsc = NULL;
5705 kfree(mdsc);
38d46409 5706 doutc(fsc->client, "%p done\n", mdsc);
3d14c5d2
YS		 5707}
5708
430afbad
YZ		 5709void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5710{
5711 struct ceph_fs_client *fsc = mdsc->fsc;
38d46409 5712 struct ceph_client *cl = fsc->client;
430afbad
YZ		 5713 const char *mds_namespace = fsc->mount_options->mds_namespace;
5714 void *p = msg->front.iov_base;
5715 void *end = p + msg->front.iov_len;
5716 u32 epoch;
430afbad
YZ		 5717 u32 num_fs;
5718 u32 mount_fscid = (u32)-1;
430afbad
YZ		 5719 int err = -EINVAL;
5720
5721 ceph_decode_need(&p, end, sizeof(u32), bad);
5722 epoch = ceph_decode_32(&p);
5723
38d46409 5724 doutc(cl, "epoch %u\n", epoch);
430afbad 5725
06a1ad43
JL		 5726 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5727 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
430afbad 5728
06a1ad43 5729 ceph_decode_32_safe(&p, end, num_fs, bad);
430afbad
YZ		 5730 while (num_fs-- > 0) {
5731 void *info_p, *info_end;
5732 u32 info_len;
430afbad
YZ		 5733 u32 fscid, namelen;
5734
5735 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
06a1ad43 5736 p += 2; // info_v, info_cv
430afbad
YZ		 5737 info_len = ceph_decode_32(&p);
5738 ceph_decode_need(&p, end, info_len, bad);
5739 info_p = p;
5740 info_end = p + info_len;
5741 p = info_end;
5742
5743 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5744 fscid = ceph_decode_32(&info_p);
5745 namelen = ceph_decode_32(&info_p);
5746 ceph_decode_need(&info_p, info_end, namelen, bad);
5747
5748 if (mds_namespace &&
5749 strlen(mds_namespace) == namelen &&
5750 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5751 mount_fscid = fscid;
5752 break;
5753 }
5754 }
5755
5756 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5757 if (mount_fscid != (u32)-1) {
5758 fsc->client->monc.fs_cluster_id = mount_fscid;
5759 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5760 0, true);
5761 ceph_monc_renew_subs(&fsc->client->monc);
5762 } else {
5763 err = -ENOENT;
5764 goto err_out;
5765 }
5766 return;
76bd6ec4 5767
430afbad 5768bad:
38d46409
XL		 5769 pr_err_client(cl, "error decoding fsmap %d. Shutting down mount.\n",
5770 err);
631ed4b0 5771 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 5772 ceph_msg_dump(msg);
430afbad
YZ		 5773err_out:
5774 mutex_lock(&mdsc->mutex);
76bd6ec4 5775 mdsc->mdsmap_err = err;
430afbad
YZ		 5776 __wake_requests(mdsc, &mdsc->waiting_for_map);
5777 mutex_unlock(&mdsc->mutex);
430afbad 5778}
2f2dc053
SW		 5779
5780/*
5781 * handle mds map update.
5782 */
430afbad 5783void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2f2dc053 5784{
38d46409 5785 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5786 u32 epoch;
5787 u32 maplen;
5788 void *p = msg->front.iov_base;
5789 void *end = p + msg->front.iov_len;
5790 struct ceph_mdsmap *newmap, *oldmap;
5791 struct ceph_fsid fsid;
5792 int err = -EINVAL;
5793
5794 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5795 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3d14c5d2 5796 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
0743304d 5797 return;
c89136ea
SW		 5798 epoch = ceph_decode_32(&p);
5799 maplen = ceph_decode_32(&p);
38d46409 5800 doutc(cl, "epoch %u len %d\n", epoch, (int)maplen);
2f2dc053
SW		 5801
5802 /* do we need it? */
2f2dc053
SW		 5803 mutex_lock(&mdsc->mutex);
5804 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
38d46409 5805 doutc(cl, "epoch %u <= our %u\n", epoch, mdsc->mdsmap->m_epoch);
2f2dc053
SW		 5806 mutex_unlock(&mdsc->mutex);
5807 return;
5808 }
5809
197b7d79 5810 newmap = ceph_mdsmap_decode(mdsc, &p, end, ceph_msgr2(mdsc->fsc->client));
2f2dc053
SW		 5811 if (IS_ERR(newmap)) {
5812 err = PTR_ERR(newmap);
5813 goto bad_unlock;
5814 }
5815
5816 /* swap into place */
5817 if (mdsc->mdsmap) {
5818 oldmap = mdsc->mdsmap;
5819 mdsc->mdsmap = newmap;
5820 check_new_map(mdsc, newmap, oldmap);
5821 ceph_mdsmap_destroy(oldmap);
5822 } else {
5823 mdsc->mdsmap = newmap; /* first mds map */
5824 }
719784ba
CX		 5825 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5826 MAX_LFS_FILESIZE);
2f2dc053
SW		 5827
5828 __wake_requests(mdsc, &mdsc->waiting_for_map);
82dcabad
ID		 5829 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5830 mdsc->mdsmap->m_epoch);
2f2dc053
SW		 5831
5832 mutex_unlock(&mdsc->mutex);
bf2ba432 5833 schedule_delayed(mdsc, 0);
2f2dc053
SW		 5834 return;
5835
5836bad_unlock:
5837 mutex_unlock(&mdsc->mutex);
5838bad:
38d46409
XL		 5839 pr_err_client(cl, "error decoding mdsmap %d. Shutting down mount.\n",
5840 err);
631ed4b0 5841 ceph_umount_begin(mdsc->fsc->sb);
8b0da5c5 5842 ceph_msg_dump(msg);
2f2dc053
SW		 5843 return;
5844}
5845
4972cf60 5846static struct ceph_connection *mds_get_con(struct ceph_connection *con)
2f2dc053
SW		 5847{
5848 struct ceph_mds_session *s = con->private;
5849
5b3248c6 5850 if (ceph_get_mds_session(s))
2f2dc053 5851 return con;
2f2dc053
SW		 5852 return NULL;
5853}
5854
4972cf60 5855static void mds_put_con(struct ceph_connection *con)
2f2dc053
SW		 5856{
5857 struct ceph_mds_session *s = con->private;
5858
2f2dc053
SW		 5859 ceph_put_mds_session(s);
5860}
5861
5862/*
5863 * if the client is unresponsive for long enough, the mds will kill
5864 * the session entirely.
5865 */
4972cf60 5866static void mds_peer_reset(struct ceph_connection *con)
2f2dc053
SW		 5867{
5868 struct ceph_mds_session *s = con->private;
7e70f0ed 5869 struct ceph_mds_client *mdsc = s->s_mdsc;
2f2dc053 5870
38d46409
XL		 5871 pr_warn_client(mdsc->fsc->client, "mds%d closed our session\n",
5872 s->s_mds);
a68e564a
XL		 5873 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO)
5874 send_mds_reconnect(mdsc, s);
2f2dc053
SW		 5875}
5876
4972cf60 5877static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
2f2dc053
SW		 5878{
5879 struct ceph_mds_session *s = con->private;
5880 struct ceph_mds_client *mdsc = s->s_mdsc;
38d46409 5881 struct ceph_client *cl = mdsc->fsc->client;
2f2dc053
SW		 5882 int type = le16_to_cpu(msg->hdr.type);
5883
2600d2dd
SW		 5884 mutex_lock(&mdsc->mutex);
5885 if (__verify_registered_session(mdsc, s) < 0) {
5886 mutex_unlock(&mdsc->mutex);
5887 goto out;
5888 }
5889 mutex_unlock(&mdsc->mutex);
5890
2f2dc053
SW		 5891 switch (type) {
5892 case CEPH_MSG_MDS_MAP:
430afbad
YZ		 5893 ceph_mdsc_handle_mdsmap(mdsc, msg);
5894 break;
5895 case CEPH_MSG_FS_MAP_USER:
5896 ceph_mdsc_handle_fsmap(mdsc, msg);
2f2dc053
SW		 5897 break;
5898 case CEPH_MSG_CLIENT_SESSION:
5899 handle_session(s, msg);
5900 break;
5901 case CEPH_MSG_CLIENT_REPLY:
5902 handle_reply(s, msg);
5903 break;
5904 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
2600d2dd 5905 handle_forward(mdsc, s, msg);
2f2dc053
SW		 5906 break;
5907 case CEPH_MSG_CLIENT_CAPS:
5908 ceph_handle_caps(s, msg);
5909 break;
5910 case CEPH_MSG_CLIENT_SNAP:
2600d2dd 5911 ceph_handle_snap(mdsc, s, msg);
2f2dc053
SW		 5912 break;
5913 case CEPH_MSG_CLIENT_LEASE:
2600d2dd 5914 handle_lease(mdsc, s, msg);
2f2dc053 5915 break;
fb18a575
LH		 5916 case CEPH_MSG_CLIENT_QUOTA:
5917 ceph_handle_quota(mdsc, s, msg);
5918 break;
2f2dc053
SW		 5919
5920 default:
38d46409
XL		 5921 pr_err_client(cl, "received unknown message type %d %s\n",
5922 type, ceph_msg_type_name(type));
2f2dc053 5923 }
2600d2dd 5924out:
2f2dc053
SW		 5925 ceph_msg_put(msg);
5926}
5927
4e7a5dcd
SW		 5928/*
5929 * authentication
5930 */
a3530df3
AE		 5931
5932/*
5933 * Note: returned pointer is the address of a structure that's
5934 * managed separately. Caller must *not* attempt to free it.
5935 */
4972cf60
ID		 5936static struct ceph_auth_handshake *
5937mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
4e7a5dcd
SW		 5938{
5939 struct ceph_mds_session *s = con->private;
5940 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5941 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
74f1869f 5942 struct ceph_auth_handshake *auth = &s->s_auth;
ce287162 5943 int ret;
4e7a5dcd 5944
ce287162
ID		 5945 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5946 force_new, proto, NULL, NULL);
5947 if (ret)
5948 return ERR_PTR(ret);
74f1869f 5949
a3530df3 5950 return auth;
4e7a5dcd
SW		 5951}
5952
4972cf60 5953static int mds_add_authorizer_challenge(struct ceph_connection *con,
6daca13d
ID		 5954 void *challenge_buf, int challenge_buf_len)
5955{
5956 struct ceph_mds_session *s = con->private;
5957 struct ceph_mds_client *mdsc = s->s_mdsc;
5958 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5959
5960 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5961 challenge_buf, challenge_buf_len);
5962}
4e7a5dcd 5963
4972cf60 5964static int mds_verify_authorizer_reply(struct ceph_connection *con)
4e7a5dcd
SW		 5965{
5966 struct ceph_mds_session *s = con->private;
5967 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5968 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
285ea34f 5969 struct ceph_auth_handshake *auth = &s->s_auth;
4e7a5dcd 5970
285ea34f
ID		 5971 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5972 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5973 NULL, NULL, NULL, NULL);
4e7a5dcd
SW		 5974}
5975
4972cf60 5976static int mds_invalidate_authorizer(struct ceph_connection *con)
9bd2e6f8
SW		 5977{
5978 struct ceph_mds_session *s = con->private;
5979 struct ceph_mds_client *mdsc = s->s_mdsc;
3d14c5d2 5980 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
9bd2e6f8 5981
27859f97 5982 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
9bd2e6f8 5983
3d14c5d2 5984 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
9bd2e6f8
SW		 5985}
5986
cd1a677c
ID		 5987static int mds_get_auth_request(struct ceph_connection *con,
5988 void *buf, int *buf_len,
5989 void **authorizer, int *authorizer_len)
5990{
5991 struct ceph_mds_session *s = con->private;
5992 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5993 struct ceph_auth_handshake *auth = &s->s_auth;
5994 int ret;
5995
5996 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5997 buf, buf_len);
5998 if (ret)
5999 return ret;
6000
6001 *authorizer = auth->authorizer_buf;
6002 *authorizer_len = auth->authorizer_buf_len;
6003 return 0;
6004}
6005
6006static int mds_handle_auth_reply_more(struct ceph_connection *con,
6007 void *reply, int reply_len,
6008 void *buf, int *buf_len,
6009 void **authorizer, int *authorizer_len)
6010{
6011 struct ceph_mds_session *s = con->private;
6012 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6013 struct ceph_auth_handshake *auth = &s->s_auth;
6014 int ret;
6015
6016 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
6017 buf, buf_len);
6018 if (ret)
6019 return ret;
6020
6021 *authorizer = auth->authorizer_buf;
6022 *authorizer_len = auth->authorizer_buf_len;
6023 return 0;
6024}
6025
6026static int mds_handle_auth_done(struct ceph_connection *con,
6027 u64 global_id, void *reply, int reply_len,
6028 u8 *session_key, int *session_key_len,
6029 u8 *con_secret, int *con_secret_len)
6030{
6031 struct ceph_mds_session *s = con->private;
6032 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
6033 struct ceph_auth_handshake *auth = &s->s_auth;
6034
6035 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
6036 session_key, session_key_len,
6037 con_secret, con_secret_len);
6038}
6039
6040static int mds_handle_auth_bad_method(struct ceph_connection *con,
6041 int used_proto, int result,
6042 const int *allowed_protos, int proto_cnt,
6043 const int *allowed_modes, int mode_cnt)
6044{
6045 struct ceph_mds_session *s = con->private;
6046 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
6047 int ret;
6048
6049 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
6050 used_proto, result,
6051 allowed_protos, proto_cnt,
6052 allowed_modes, mode_cnt)) {
6053 ret = ceph_monc_validate_auth(monc);
6054 if (ret)
6055 return ret;
6056 }
6057
6058 return -EACCES;
6059}
6060
53ded495
AE		 6061static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
6062 struct ceph_msg_header *hdr, int *skip)
6063{
6064 struct ceph_msg *msg;
6065 int type = (int) le16_to_cpu(hdr->type);
6066 int front_len = (int) le32_to_cpu(hdr->front_len);
6067
6068 if (con->in_msg)
6069 return con->in_msg;
6070
6071 *skip = 0;
6072 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
6073 if (!msg) {
6074 pr_err("unable to allocate msg type %d len %d\n",
6075 type, front_len);
6076 return NULL;
6077 }
53ded495
AE		 6078
6079 return msg;
6080}
6081
79dbd1ba 6082static int mds_sign_message(struct ceph_msg *msg)
33d07337 6083{
79dbd1ba 6084 struct ceph_mds_session *s = msg->con->private;
33d07337 6085 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6086
33d07337
YZ		 6087 return ceph_auth_sign_message(auth, msg);
6088}
6089
79dbd1ba 6090static int mds_check_message_signature(struct ceph_msg *msg)
33d07337 6091{
79dbd1ba 6092 struct ceph_mds_session *s = msg->con->private;
33d07337 6093 struct ceph_auth_handshake *auth = &s->s_auth;
79dbd1ba 6094
33d07337
YZ		 6095 return ceph_auth_check_message_signature(auth, msg);
6096}
6097
9e32789f 6098static const struct ceph_connection_operations mds_con_ops = {
4972cf60
ID		 6099 .get = mds_get_con,
6100 .put = mds_put_con,
53ded495 6101 .alloc_msg = mds_alloc_msg,
4972cf60
ID		 6102 .dispatch = mds_dispatch,
6103 .peer_reset = mds_peer_reset,
6104 .get_authorizer = mds_get_authorizer,
6105 .add_authorizer_challenge = mds_add_authorizer_challenge,
6106 .verify_authorizer_reply = mds_verify_authorizer_reply,
6107 .invalidate_authorizer = mds_invalidate_authorizer,
79dbd1ba
ID		 6108 .sign_message = mds_sign_message,
6109 .check_message_signature = mds_check_message_signature,
cd1a677c
ID		 6110 .get_auth_request = mds_get_auth_request,
6111 .handle_auth_reply_more = mds_handle_auth_reply_more,
6112 .handle_auth_done = mds_handle_auth_done,
6113 .handle_auth_bad_method = mds_handle_auth_bad_method,
2f2dc053
SW		 6114};
6115
2f2dc053 6116/* eof */
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