1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
5 #include <linux/wait.h>
6 #include <linux/slab.h>
8 #include <linux/sched.h>
9 #include <linux/debugfs.h>
10 #include <linux/seq_file.h>
11 #include <linux/ratelimit.h>
12 #include <linux/bits.h>
13 #include <linux/ktime.h>
14 #include <linux/bitmap.h>
17 #include "mds_client.h"
20 #include <linux/ceph/ceph_features.h>
21 #include <linux/ceph/messenger.h>
22 #include <linux/ceph/decode.h>
23 #include <linux/ceph/pagelist.h>
24 #include <linux/ceph/auth.h>
25 #include <linux/ceph/debugfs.h>
27 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
30 * A cluster of MDS (metadata server) daemons is responsible for
31 * managing the file system namespace (the directory hierarchy and
32 * inodes) and for coordinating shared access to storage. Metadata is
33 * partitioning hierarchically across a number of servers, and that
34 * partition varies over time as the cluster adjusts the distribution
35 * in order to balance load.
37 * The MDS client is primarily responsible to managing synchronous
38 * metadata requests for operations like open, unlink, and so forth.
39 * If there is a MDS failure, we find out about it when we (possibly
40 * request and) receive a new MDS map, and can resubmit affected
43 * For the most part, though, we take advantage of a lossless
44 * communications channel to the MDS, and do not need to worry about
45 * timing out or resubmitting requests.
47 * We maintain a stateful "session" with each MDS we interact with.
48 * Within each session, we sent periodic heartbeat messages to ensure
49 * any capabilities or leases we have been issues remain valid. If
50 * the session times out and goes stale, our leases and capabilities
51 * are no longer valid.
54 struct ceph_reconnect_state {
55 struct ceph_mds_session *session;
56 int nr_caps, nr_realms;
57 struct ceph_pagelist *pagelist;
62 static void __wake_requests(struct ceph_mds_client *mdsc,
63 struct list_head *head);
64 static void ceph_cap_release_work(struct work_struct *work);
65 static void ceph_cap_reclaim_work(struct work_struct *work);
67 static const struct ceph_connection_operations mds_con_ops;
74 static int parse_reply_info_quota(void **p, void *end,
75 struct ceph_mds_reply_info_in *info)
77 u8 struct_v, struct_compat;
80 ceph_decode_8_safe(p, end, struct_v, bad);
81 ceph_decode_8_safe(p, end, struct_compat, bad);
82 /* struct_v is expected to be >= 1. we only
83 * understand encoding with struct_compat == 1. */
84 if (!struct_v || struct_compat != 1)
86 ceph_decode_32_safe(p, end, struct_len, bad);
87 ceph_decode_need(p, end, struct_len, bad);
88 end = *p + struct_len;
89 ceph_decode_64_safe(p, end, info->max_bytes, bad);
90 ceph_decode_64_safe(p, end, info->max_files, bad);
98 * parse individual inode info
100 static int parse_reply_info_in(void **p, void *end,
101 struct ceph_mds_reply_info_in *info,
107 if (features == (u64)-1) {
110 ceph_decode_8_safe(p, end, struct_v, bad);
111 ceph_decode_8_safe(p, end, struct_compat, bad);
112 /* struct_v is expected to be >= 1. we only understand
113 * encoding with struct_compat == 1. */
114 if (!struct_v || struct_compat != 1)
116 ceph_decode_32_safe(p, end, struct_len, bad);
117 ceph_decode_need(p, end, struct_len, bad);
118 end = *p + struct_len;
121 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
123 *p += sizeof(struct ceph_mds_reply_inode) +
124 sizeof(*info->in->fragtree.splits) *
125 le32_to_cpu(info->in->fragtree.nsplits);
127 ceph_decode_32_safe(p, end, info->symlink_len, bad);
128 ceph_decode_need(p, end, info->symlink_len, bad);
130 *p += info->symlink_len;
132 ceph_decode_copy_safe(p, end, &info->dir_layout,
133 sizeof(info->dir_layout), bad);
134 ceph_decode_32_safe(p, end, info->xattr_len, bad);
135 ceph_decode_need(p, end, info->xattr_len, bad);
136 info->xattr_data = *p;
137 *p += info->xattr_len;
139 if (features == (u64)-1) {
141 ceph_decode_64_safe(p, end, info->inline_version, bad);
142 ceph_decode_32_safe(p, end, info->inline_len, bad);
143 ceph_decode_need(p, end, info->inline_len, bad);
144 info->inline_data = *p;
145 *p += info->inline_len;
147 err = parse_reply_info_quota(p, end, info);
151 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
152 if (info->pool_ns_len > 0) {
153 ceph_decode_need(p, end, info->pool_ns_len, bad);
154 info->pool_ns_data = *p;
155 *p += info->pool_ns_len;
159 ceph_decode_need(p, end, sizeof(info->btime), bad);
160 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
162 /* change attribute */
163 ceph_decode_64_safe(p, end, info->change_attr, bad);
167 ceph_decode_32_safe(p, end, info->dir_pin, bad);
169 info->dir_pin = -ENODATA;
172 /* snapshot birth time, remains zero for v<=2 */
174 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
175 ceph_decode_copy(p, &info->snap_btime,
176 sizeof(info->snap_btime));
178 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
181 /* snapshot count, remains zero for v<=3 */
183 ceph_decode_64_safe(p, end, info->rsnaps, bad);
191 ceph_decode_32_safe(p, end, alen, bad);
197 ceph_decode_32_safe(p, end, len, bad);
198 ceph_decode_skip_n(p, end, len, bad);
200 ceph_decode_32_safe(p, end, len, bad);
201 ceph_decode_skip_n(p, end, len, bad);
205 /* fscrypt flag -- ignore */
207 ceph_decode_skip_8(p, end, bad);
209 info->fscrypt_auth = NULL;
210 info->fscrypt_auth_len = 0;
211 info->fscrypt_file = NULL;
212 info->fscrypt_file_len = 0;
214 ceph_decode_32_safe(p, end, info->fscrypt_auth_len, bad);
215 if (info->fscrypt_auth_len) {
216 info->fscrypt_auth = kmalloc(info->fscrypt_auth_len,
218 if (!info->fscrypt_auth)
220 ceph_decode_copy_safe(p, end, info->fscrypt_auth,
221 info->fscrypt_auth_len, bad);
223 ceph_decode_32_safe(p, end, info->fscrypt_file_len, bad);
224 if (info->fscrypt_file_len) {
225 info->fscrypt_file = kmalloc(info->fscrypt_file_len,
227 if (!info->fscrypt_file)
229 ceph_decode_copy_safe(p, end, info->fscrypt_file,
230 info->fscrypt_file_len, bad);
235 /* legacy (unversioned) struct */
236 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
237 ceph_decode_64_safe(p, end, info->inline_version, bad);
238 ceph_decode_32_safe(p, end, info->inline_len, bad);
239 ceph_decode_need(p, end, info->inline_len, bad);
240 info->inline_data = *p;
241 *p += info->inline_len;
243 info->inline_version = CEPH_INLINE_NONE;
245 if (features & CEPH_FEATURE_MDS_QUOTA) {
246 err = parse_reply_info_quota(p, end, info);
254 info->pool_ns_len = 0;
255 info->pool_ns_data = NULL;
256 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
257 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
258 if (info->pool_ns_len > 0) {
259 ceph_decode_need(p, end, info->pool_ns_len, bad);
260 info->pool_ns_data = *p;
261 *p += info->pool_ns_len;
265 if (features & CEPH_FEATURE_FS_BTIME) {
266 ceph_decode_need(p, end, sizeof(info->btime), bad);
267 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
268 ceph_decode_64_safe(p, end, info->change_attr, bad);
271 info->dir_pin = -ENODATA;
272 /* info->snap_btime and info->rsnaps remain zero */
281 static int parse_reply_info_dir(void **p, void *end,
282 struct ceph_mds_reply_dirfrag **dirfrag,
285 if (features == (u64)-1) {
286 u8 struct_v, struct_compat;
288 ceph_decode_8_safe(p, end, struct_v, bad);
289 ceph_decode_8_safe(p, end, struct_compat, bad);
290 /* struct_v is expected to be >= 1. we only understand
291 * encoding whose struct_compat == 1. */
292 if (!struct_v || struct_compat != 1)
294 ceph_decode_32_safe(p, end, struct_len, bad);
295 ceph_decode_need(p, end, struct_len, bad);
296 end = *p + struct_len;
299 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
301 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
302 if (unlikely(*p > end))
304 if (features == (u64)-1)
311 static int parse_reply_info_lease(void **p, void *end,
312 struct ceph_mds_reply_lease **lease,
313 u64 features, u32 *altname_len, u8 **altname)
319 if (features == (u64)-1) {
322 ceph_decode_8_safe(p, end, struct_v, bad);
323 ceph_decode_8_safe(p, end, struct_compat, bad);
325 /* struct_v is expected to be >= 1. we only understand
326 * encoding whose struct_compat == 1. */
327 if (!struct_v || struct_compat != 1)
330 ceph_decode_32_safe(p, end, struct_len, bad);
332 struct_len = sizeof(**lease);
337 lend = *p + struct_len;
338 ceph_decode_need(p, end, struct_len, bad);
340 *p += sizeof(**lease);
342 if (features == (u64)-1) {
344 ceph_decode_32_safe(p, end, *altname_len, bad);
345 ceph_decode_need(p, end, *altname_len, bad);
360 * parse a normal reply, which may contain a (dir+)dentry and/or a
363 static int parse_reply_info_trace(void **p, void *end,
364 struct ceph_mds_reply_info_parsed *info,
369 if (info->head->is_dentry) {
370 err = parse_reply_info_in(p, end, &info->diri, features);
374 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
378 ceph_decode_32_safe(p, end, info->dname_len, bad);
379 ceph_decode_need(p, end, info->dname_len, bad);
381 *p += info->dname_len;
383 err = parse_reply_info_lease(p, end, &info->dlease, features,
384 &info->altname_len, &info->altname);
389 if (info->head->is_target) {
390 err = parse_reply_info_in(p, end, &info->targeti, features);
395 if (unlikely(*p != end))
402 pr_err("problem parsing mds trace %d\n", err);
407 * parse readdir results
409 static int parse_reply_info_readdir(void **p, void *end,
410 struct ceph_mds_request *req,
413 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
417 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
421 ceph_decode_need(p, end, sizeof(num) + 2, bad);
422 num = ceph_decode_32(p);
424 u16 flags = ceph_decode_16(p);
425 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
426 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
427 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
428 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
433 BUG_ON(!info->dir_entries);
434 if ((unsigned long)(info->dir_entries + num) >
435 (unsigned long)info->dir_entries + info->dir_buf_size) {
436 pr_err("dir contents are larger than expected\n");
443 struct inode *inode = d_inode(req->r_dentry);
444 struct ceph_inode_info *ci = ceph_inode(inode);
445 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
446 struct fscrypt_str tname = FSTR_INIT(NULL, 0);
447 struct fscrypt_str oname = FSTR_INIT(NULL, 0);
448 struct ceph_fname fname;
449 u32 altname_len, _name_len;
453 ceph_decode_32_safe(p, end, _name_len, bad);
454 ceph_decode_need(p, end, _name_len, bad);
457 dout("parsed dir dname '%.*s'\n", _name_len, _name);
459 if (info->hash_order)
460 rde->raw_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
464 err = parse_reply_info_lease(p, end, &rde->lease, features,
465 &altname_len, &altname);
470 * Try to dencrypt the dentry names and update them
471 * in the ceph_mds_reply_dir_entry struct.
475 fname.name_len = _name_len;
476 fname.ctext = altname;
477 fname.ctext_len = altname_len;
479 * The _name_len maybe larger than altname_len, such as
480 * when the human readable name length is in range of
481 * (CEPH_NOHASH_NAME_MAX, CEPH_NOHASH_NAME_MAX + SHA256_DIGEST_SIZE),
482 * then the copy in ceph_fname_to_usr will corrupt the
483 * data if there has no encryption key.
485 * Just set the no_copy flag and then if there has no
486 * encryption key the oname.name will be assigned to
489 fname.no_copy = true;
490 if (altname_len == 0) {
492 * Set tname to _name, and this will be used
493 * to do the base64_decode in-place. It's
494 * safe because the decoded string should
495 * always be shorter, which is 3/4 of origin
501 * Set oname to _name too, and this will be
502 * used to do the dencryption in-place.
505 oname.len = _name_len;
508 * This will do the decryption only in-place
509 * from altname cryptext directly.
511 oname.name = altname;
512 oname.len = altname_len;
514 rde->is_nokey = false;
515 err = ceph_fname_to_usr(&fname, &tname, &oname, &rde->is_nokey);
517 pr_err("%s unable to decode %.*s, got %d\n", __func__,
518 _name_len, _name, err);
521 rde->name = oname.name;
522 rde->name_len = oname.len;
525 err = parse_reply_info_in(p, end, &rde->inode, features);
528 /* ceph_readdir_prepopulate() will update it */
535 /* Skip over any unrecognized fields */
542 pr_err("problem parsing dir contents %d\n", err);
547 * parse fcntl F_GETLK results
549 static int parse_reply_info_filelock(void **p, void *end,
550 struct ceph_mds_reply_info_parsed *info,
553 if (*p + sizeof(*info->filelock_reply) > end)
556 info->filelock_reply = *p;
558 /* Skip over any unrecognized fields */
566 #if BITS_PER_LONG == 64
568 #define DELEGATED_INO_AVAILABLE xa_mk_value(1)
570 static int ceph_parse_deleg_inos(void **p, void *end,
571 struct ceph_mds_session *s)
575 ceph_decode_32_safe(p, end, sets, bad);
576 dout("got %u sets of delegated inodes\n", sets);
580 ceph_decode_64_safe(p, end, start, bad);
581 ceph_decode_64_safe(p, end, len, bad);
583 /* Don't accept a delegation of system inodes */
584 if (start < CEPH_INO_SYSTEM_BASE) {
585 pr_warn_ratelimited("ceph: ignoring reserved inode range delegation (start=0x%llx len=0x%llx)\n",
590 int err = xa_insert(&s->s_delegated_inos, start++,
591 DELEGATED_INO_AVAILABLE,
594 dout("added delegated inode 0x%llx\n",
596 } else if (err == -EBUSY) {
597 pr_warn("MDS delegated inode 0x%llx more than once.\n",
609 u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
614 xa_for_each(&s->s_delegated_inos, ino, val) {
615 val = xa_erase(&s->s_delegated_inos, ino);
616 if (val == DELEGATED_INO_AVAILABLE)
622 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
624 return xa_insert(&s->s_delegated_inos, ino, DELEGATED_INO_AVAILABLE,
627 #else /* BITS_PER_LONG == 64 */
629 * FIXME: xarrays can't handle 64-bit indexes on a 32-bit arch. For now, just
630 * ignore delegated_inos on 32 bit arch. Maybe eventually add xarrays for top
633 static int ceph_parse_deleg_inos(void **p, void *end,
634 struct ceph_mds_session *s)
638 ceph_decode_32_safe(p, end, sets, bad);
640 ceph_decode_skip_n(p, end, sets * 2 * sizeof(__le64), bad);
646 u64 ceph_get_deleg_ino(struct ceph_mds_session *s)
651 int ceph_restore_deleg_ino(struct ceph_mds_session *s, u64 ino)
655 #endif /* BITS_PER_LONG == 64 */
658 * parse create results
660 static int parse_reply_info_create(void **p, void *end,
661 struct ceph_mds_reply_info_parsed *info,
662 u64 features, struct ceph_mds_session *s)
666 if (features == (u64)-1 ||
667 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
669 /* Malformed reply? */
670 info->has_create_ino = false;
671 } else if (test_bit(CEPHFS_FEATURE_DELEG_INO, &s->s_features)) {
672 info->has_create_ino = true;
673 /* struct_v, struct_compat, and len */
674 ceph_decode_skip_n(p, end, 2 + sizeof(u32), bad);
675 ceph_decode_64_safe(p, end, info->ino, bad);
676 ret = ceph_parse_deleg_inos(p, end, s);
681 ceph_decode_64_safe(p, end, info->ino, bad);
682 info->has_create_ino = true;
689 /* Skip over any unrecognized fields */
696 static int parse_reply_info_getvxattr(void **p, void *end,
697 struct ceph_mds_reply_info_parsed *info,
702 ceph_decode_skip_8(p, end, bad); /* skip current version: 1 */
703 ceph_decode_skip_8(p, end, bad); /* skip first version: 1 */
704 ceph_decode_skip_32(p, end, bad); /* skip payload length */
706 ceph_decode_32_safe(p, end, value_len, bad);
708 if (value_len == end - *p) {
709 info->xattr_info.xattr_value = *p;
710 info->xattr_info.xattr_value_len = value_len;
719 * parse extra results
721 static int parse_reply_info_extra(void **p, void *end,
722 struct ceph_mds_request *req,
723 u64 features, struct ceph_mds_session *s)
725 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
726 u32 op = le32_to_cpu(info->head->op);
728 if (op == CEPH_MDS_OP_GETFILELOCK)
729 return parse_reply_info_filelock(p, end, info, features);
730 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
731 return parse_reply_info_readdir(p, end, req, features);
732 else if (op == CEPH_MDS_OP_CREATE)
733 return parse_reply_info_create(p, end, info, features, s);
734 else if (op == CEPH_MDS_OP_GETVXATTR)
735 return parse_reply_info_getvxattr(p, end, info, features);
741 * parse entire mds reply
743 static int parse_reply_info(struct ceph_mds_session *s, struct ceph_msg *msg,
744 struct ceph_mds_request *req, u64 features)
746 struct ceph_mds_reply_info_parsed *info = &req->r_reply_info;
751 info->head = msg->front.iov_base;
752 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
753 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
756 ceph_decode_32_safe(&p, end, len, bad);
758 ceph_decode_need(&p, end, len, bad);
759 err = parse_reply_info_trace(&p, p+len, info, features);
765 ceph_decode_32_safe(&p, end, len, bad);
767 ceph_decode_need(&p, end, len, bad);
768 err = parse_reply_info_extra(&p, p+len, req, features, s);
774 ceph_decode_32_safe(&p, end, len, bad);
775 info->snapblob_len = len;
786 pr_err("mds parse_reply err %d\n", err);
791 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
795 kfree(info->diri.fscrypt_auth);
796 kfree(info->diri.fscrypt_file);
797 kfree(info->targeti.fscrypt_auth);
798 kfree(info->targeti.fscrypt_file);
799 if (!info->dir_entries)
802 for (i = 0; i < info->dir_nr; i++) {
803 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
805 kfree(rde->inode.fscrypt_auth);
806 kfree(rde->inode.fscrypt_file);
808 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
812 * In async unlink case the kclient won't wait for the first reply
813 * from MDS and just drop all the links and unhash the dentry and then
814 * succeeds immediately.
816 * For any new create/link/rename,etc requests followed by using the
817 * same file names we must wait for the first reply of the inflight
818 * unlink request, or the MDS possibly will fail these following
819 * requests with -EEXIST if the inflight async unlink request was
820 * delayed for some reasons.
822 * And the worst case is that for the none async openc request it will
823 * successfully open the file if the CDentry hasn't been unlinked yet,
824 * but later the previous delayed async unlink request will remove the
825 * CDenty. That means the just created file is possiblly deleted later
828 * We need to wait for the inflight async unlink requests to finish
829 * when creating new files/directories by using the same file names.
831 int ceph_wait_on_conflict_unlink(struct dentry *dentry)
833 struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
834 struct dentry *pdentry = dentry->d_parent;
835 struct dentry *udentry, *found = NULL;
836 struct ceph_dentry_info *di;
838 u32 hash = dentry->d_name.hash;
841 dname.name = dentry->d_name.name;
842 dname.len = dentry->d_name.len;
845 hash_for_each_possible_rcu(fsc->async_unlink_conflict, di,
847 udentry = di->dentry;
849 spin_lock(&udentry->d_lock);
850 if (udentry->d_name.hash != hash)
852 if (unlikely(udentry->d_parent != pdentry))
854 if (!hash_hashed(&di->hnode))
857 if (!test_bit(CEPH_DENTRY_ASYNC_UNLINK_BIT, &di->flags))
858 pr_warn("%s dentry %p:%pd async unlink bit is not set\n",
859 __func__, dentry, dentry);
861 if (!d_same_name(udentry, pdentry, &dname))
864 spin_unlock(&udentry->d_lock);
865 found = dget(udentry);
868 spin_unlock(&udentry->d_lock);
875 dout("%s dentry %p:%pd conflict with old %p:%pd\n", __func__,
876 dentry, dentry, found, found);
878 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_UNLINK_BIT,
888 const char *ceph_session_state_name(int s)
891 case CEPH_MDS_SESSION_NEW: return "new";
892 case CEPH_MDS_SESSION_OPENING: return "opening";
893 case CEPH_MDS_SESSION_OPEN: return "open";
894 case CEPH_MDS_SESSION_HUNG: return "hung";
895 case CEPH_MDS_SESSION_CLOSING: return "closing";
896 case CEPH_MDS_SESSION_CLOSED: return "closed";
897 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
898 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
899 case CEPH_MDS_SESSION_REJECTED: return "rejected";
900 default: return "???";
904 struct ceph_mds_session *ceph_get_mds_session(struct ceph_mds_session *s)
906 if (refcount_inc_not_zero(&s->s_ref))
911 void ceph_put_mds_session(struct ceph_mds_session *s)
913 if (IS_ERR_OR_NULL(s))
916 if (refcount_dec_and_test(&s->s_ref)) {
917 if (s->s_auth.authorizer)
918 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
919 WARN_ON(mutex_is_locked(&s->s_mutex));
920 xa_destroy(&s->s_delegated_inos);
926 * called under mdsc->mutex
928 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
931 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
933 return ceph_get_mds_session(mdsc->sessions[mds]);
936 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
938 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
944 static int __verify_registered_session(struct ceph_mds_client *mdsc,
945 struct ceph_mds_session *s)
947 if (s->s_mds >= mdsc->max_sessions ||
948 mdsc->sessions[s->s_mds] != s)
954 * create+register a new session for given mds.
955 * called under mdsc->mutex.
957 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
960 struct ceph_mds_session *s;
962 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
963 return ERR_PTR(-EIO);
965 if (mds >= mdsc->mdsmap->possible_max_rank)
966 return ERR_PTR(-EINVAL);
968 s = kzalloc(sizeof(*s), GFP_NOFS);
970 return ERR_PTR(-ENOMEM);
972 if (mds >= mdsc->max_sessions) {
973 int newmax = 1 << get_count_order(mds + 1);
974 struct ceph_mds_session **sa;
976 dout("%s: realloc to %d\n", __func__, newmax);
977 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
980 if (mdsc->sessions) {
981 memcpy(sa, mdsc->sessions,
982 mdsc->max_sessions * sizeof(void *));
983 kfree(mdsc->sessions);
986 mdsc->max_sessions = newmax;
989 dout("%s: mds%d\n", __func__, mds);
992 s->s_state = CEPH_MDS_SESSION_NEW;
993 mutex_init(&s->s_mutex);
995 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
997 atomic_set(&s->s_cap_gen, 1);
998 s->s_cap_ttl = jiffies - 1;
1000 spin_lock_init(&s->s_cap_lock);
1001 INIT_LIST_HEAD(&s->s_caps);
1002 refcount_set(&s->s_ref, 1);
1003 INIT_LIST_HEAD(&s->s_waiting);
1004 INIT_LIST_HEAD(&s->s_unsafe);
1005 xa_init(&s->s_delegated_inos);
1006 INIT_LIST_HEAD(&s->s_cap_releases);
1007 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
1009 INIT_LIST_HEAD(&s->s_cap_dirty);
1010 INIT_LIST_HEAD(&s->s_cap_flushing);
1012 mdsc->sessions[mds] = s;
1013 atomic_inc(&mdsc->num_sessions);
1014 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
1016 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
1017 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
1023 return ERR_PTR(-ENOMEM);
1027 * called under mdsc->mutex
1029 static void __unregister_session(struct ceph_mds_client *mdsc,
1030 struct ceph_mds_session *s)
1032 dout("__unregister_session mds%d %p\n", s->s_mds, s);
1033 BUG_ON(mdsc->sessions[s->s_mds] != s);
1034 mdsc->sessions[s->s_mds] = NULL;
1035 ceph_con_close(&s->s_con);
1036 ceph_put_mds_session(s);
1037 atomic_dec(&mdsc->num_sessions);
1041 * drop session refs in request.
1043 * should be last request ref, or hold mdsc->mutex
1045 static void put_request_session(struct ceph_mds_request *req)
1047 if (req->r_session) {
1048 ceph_put_mds_session(req->r_session);
1049 req->r_session = NULL;
1053 void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
1054 void (*cb)(struct ceph_mds_session *),
1059 mutex_lock(&mdsc->mutex);
1060 for (mds = 0; mds < mdsc->max_sessions; ++mds) {
1061 struct ceph_mds_session *s;
1063 s = __ceph_lookup_mds_session(mdsc, mds);
1067 if (check_state && !check_session_state(s)) {
1068 ceph_put_mds_session(s);
1072 mutex_unlock(&mdsc->mutex);
1074 ceph_put_mds_session(s);
1075 mutex_lock(&mdsc->mutex);
1077 mutex_unlock(&mdsc->mutex);
1080 void ceph_mdsc_release_request(struct kref *kref)
1082 struct ceph_mds_request *req = container_of(kref,
1083 struct ceph_mds_request,
1085 ceph_mdsc_release_dir_caps_no_check(req);
1086 destroy_reply_info(&req->r_reply_info);
1088 ceph_msg_put(req->r_request);
1090 ceph_msg_put(req->r_reply);
1092 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1095 if (req->r_parent) {
1096 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
1097 iput(req->r_parent);
1099 iput(req->r_target_inode);
1100 iput(req->r_new_inode);
1102 dput(req->r_dentry);
1103 if (req->r_old_dentry)
1104 dput(req->r_old_dentry);
1105 if (req->r_old_dentry_dir) {
1107 * track (and drop pins for) r_old_dentry_dir
1108 * separately, since r_old_dentry's d_parent may have
1109 * changed between the dir mutex being dropped and
1110 * this request being freed.
1112 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
1114 iput(req->r_old_dentry_dir);
1116 kfree(req->r_path1);
1117 kfree(req->r_path2);
1118 put_cred(req->r_cred);
1119 if (req->r_pagelist)
1120 ceph_pagelist_release(req->r_pagelist);
1121 kfree(req->r_fscrypt_auth);
1122 kfree(req->r_altname);
1123 put_request_session(req);
1124 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
1125 WARN_ON_ONCE(!list_empty(&req->r_wait));
1126 kmem_cache_free(ceph_mds_request_cachep, req);
1129 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
1132 * lookup session, bump ref if found.
1134 * called under mdsc->mutex.
1136 static struct ceph_mds_request *
1137 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
1139 struct ceph_mds_request *req;
1141 req = lookup_request(&mdsc->request_tree, tid);
1143 ceph_mdsc_get_request(req);
1149 * Register an in-flight request, and assign a tid. Link to directory
1150 * are modifying (if any).
1152 * Called under mdsc->mutex.
1154 static void __register_request(struct ceph_mds_client *mdsc,
1155 struct ceph_mds_request *req,
1160 req->r_tid = ++mdsc->last_tid;
1161 if (req->r_num_caps) {
1162 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
1165 pr_err("__register_request %p "
1166 "failed to reserve caps: %d\n", req, ret);
1167 /* set req->r_err to fail early from __do_request */
1172 dout("__register_request %p tid %lld\n", req, req->r_tid);
1173 ceph_mdsc_get_request(req);
1174 insert_request(&mdsc->request_tree, req);
1176 req->r_cred = get_current_cred();
1178 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
1179 mdsc->oldest_tid = req->r_tid;
1182 struct ceph_inode_info *ci = ceph_inode(dir);
1185 req->r_unsafe_dir = dir;
1186 spin_lock(&ci->i_unsafe_lock);
1187 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
1188 spin_unlock(&ci->i_unsafe_lock);
1192 static void __unregister_request(struct ceph_mds_client *mdsc,
1193 struct ceph_mds_request *req)
1195 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
1197 /* Never leave an unregistered request on an unsafe list! */
1198 list_del_init(&req->r_unsafe_item);
1200 if (req->r_tid == mdsc->oldest_tid) {
1201 struct rb_node *p = rb_next(&req->r_node);
1202 mdsc->oldest_tid = 0;
1204 struct ceph_mds_request *next_req =
1205 rb_entry(p, struct ceph_mds_request, r_node);
1206 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
1207 mdsc->oldest_tid = next_req->r_tid;
1214 erase_request(&mdsc->request_tree, req);
1216 if (req->r_unsafe_dir) {
1217 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
1218 spin_lock(&ci->i_unsafe_lock);
1219 list_del_init(&req->r_unsafe_dir_item);
1220 spin_unlock(&ci->i_unsafe_lock);
1222 if (req->r_target_inode &&
1223 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
1224 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
1225 spin_lock(&ci->i_unsafe_lock);
1226 list_del_init(&req->r_unsafe_target_item);
1227 spin_unlock(&ci->i_unsafe_lock);
1230 if (req->r_unsafe_dir) {
1231 iput(req->r_unsafe_dir);
1232 req->r_unsafe_dir = NULL;
1235 complete_all(&req->r_safe_completion);
1237 ceph_mdsc_put_request(req);
1241 * Walk back up the dentry tree until we hit a dentry representing a
1242 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
1243 * when calling this) to ensure that the objects won't disappear while we're
1244 * working with them. Once we hit a candidate dentry, we attempt to take a
1245 * reference to it, and return that as the result.
1247 static struct inode *get_nonsnap_parent(struct dentry *dentry)
1249 struct inode *inode = NULL;
1251 while (dentry && !IS_ROOT(dentry)) {
1252 inode = d_inode_rcu(dentry);
1253 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
1255 dentry = dentry->d_parent;
1258 inode = igrab(inode);
1263 * Choose mds to send request to next. If there is a hint set in the
1264 * request (e.g., due to a prior forward hint from the mds), use that.
1265 * Otherwise, consult frag tree and/or caps to identify the
1266 * appropriate mds. If all else fails, choose randomly.
1268 * Called under mdsc->mutex.
1270 static int __choose_mds(struct ceph_mds_client *mdsc,
1271 struct ceph_mds_request *req,
1274 struct inode *inode;
1275 struct ceph_inode_info *ci;
1276 struct ceph_cap *cap;
1277 int mode = req->r_direct_mode;
1279 u32 hash = req->r_direct_hash;
1280 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
1286 * is there a specific mds we should try? ignore hint if we have
1287 * no session and the mds is not up (active or recovering).
1289 if (req->r_resend_mds >= 0 &&
1290 (__have_session(mdsc, req->r_resend_mds) ||
1291 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
1292 dout("%s using resend_mds mds%d\n", __func__,
1294 return req->r_resend_mds;
1297 if (mode == USE_RANDOM_MDS)
1302 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
1303 inode = req->r_inode;
1306 /* req->r_dentry is non-null for LSSNAP request */
1308 inode = get_nonsnap_parent(req->r_dentry);
1310 dout("%s using snapdir's parent %p\n", __func__, inode);
1312 } else if (req->r_dentry) {
1313 /* ignore race with rename; old or new d_parent is okay */
1314 struct dentry *parent;
1318 parent = READ_ONCE(req->r_dentry->d_parent);
1319 dir = req->r_parent ? : d_inode_rcu(parent);
1321 if (!dir || dir->i_sb != mdsc->fsc->sb) {
1322 /* not this fs or parent went negative */
1323 inode = d_inode(req->r_dentry);
1326 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
1327 /* direct snapped/virtual snapdir requests
1328 * based on parent dir inode */
1329 inode = get_nonsnap_parent(parent);
1330 dout("%s using nonsnap parent %p\n", __func__, inode);
1333 inode = d_inode(req->r_dentry);
1334 if (!inode || mode == USE_AUTH_MDS) {
1337 hash = ceph_dentry_hash(dir, req->r_dentry);
1346 dout("%s %p is_hash=%d (0x%x) mode %d\n", __func__, inode, (int)is_hash,
1350 ci = ceph_inode(inode);
1352 if (is_hash && S_ISDIR(inode->i_mode)) {
1353 struct ceph_inode_frag frag;
1356 ceph_choose_frag(ci, hash, &frag, &found);
1358 if (mode == USE_ANY_MDS && frag.ndist > 0) {
1361 /* choose a random replica */
1362 get_random_bytes(&r, 1);
1365 dout("%s %p %llx.%llx frag %u mds%d (%d/%d)\n",
1366 __func__, inode, ceph_vinop(inode),
1367 frag.frag, mds, (int)r, frag.ndist);
1368 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1369 CEPH_MDS_STATE_ACTIVE &&
1370 !ceph_mdsmap_is_laggy(mdsc->mdsmap, mds))
1374 /* since this file/dir wasn't known to be
1375 * replicated, then we want to look for the
1376 * authoritative mds. */
1377 if (frag.mds >= 0) {
1378 /* choose auth mds */
1380 dout("%s %p %llx.%llx frag %u mds%d (auth)\n",
1381 __func__, inode, ceph_vinop(inode),
1383 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
1384 CEPH_MDS_STATE_ACTIVE) {
1385 if (!ceph_mdsmap_is_laggy(mdsc->mdsmap,
1390 mode = USE_AUTH_MDS;
1394 spin_lock(&ci->i_ceph_lock);
1396 if (mode == USE_AUTH_MDS)
1397 cap = ci->i_auth_cap;
1398 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1399 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1401 spin_unlock(&ci->i_ceph_lock);
1405 mds = cap->session->s_mds;
1406 dout("%s %p %llx.%llx mds%d (%scap %p)\n", __func__,
1407 inode, ceph_vinop(inode), mds,
1408 cap == ci->i_auth_cap ? "auth " : "", cap);
1409 spin_unlock(&ci->i_ceph_lock);
1418 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1419 dout("%s chose random mds%d\n", __func__, mds);
1427 struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq)
1429 struct ceph_msg *msg;
1430 struct ceph_mds_session_head *h;
1432 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1435 pr_err("ENOMEM creating session %s msg\n",
1436 ceph_session_op_name(op));
1439 h = msg->front.iov_base;
1440 h->op = cpu_to_le32(op);
1441 h->seq = cpu_to_le64(seq);
1446 static const unsigned char feature_bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1447 #define FEATURE_BYTES(c) (DIV_ROUND_UP((size_t)feature_bits[c - 1] + 1, 64) * 8)
1448 static int encode_supported_features(void **p, void *end)
1450 static const size_t count = ARRAY_SIZE(feature_bits);
1454 size_t size = FEATURE_BYTES(count);
1457 if (WARN_ON_ONCE(*p + 4 + size > end))
1460 ceph_encode_32(p, size);
1461 memset(*p, 0, size);
1462 for (i = 0; i < count; i++) {
1463 bit = feature_bits[i];
1464 ((unsigned char *)(*p))[bit / 8] |= BIT(bit % 8);
1468 if (WARN_ON_ONCE(*p + 4 > end))
1471 ceph_encode_32(p, 0);
1477 static const unsigned char metric_bits[] = CEPHFS_METRIC_SPEC_CLIENT_SUPPORTED;
1478 #define METRIC_BYTES(cnt) (DIV_ROUND_UP((size_t)metric_bits[cnt - 1] + 1, 64) * 8)
1479 static int encode_metric_spec(void **p, void *end)
1481 static const size_t count = ARRAY_SIZE(metric_bits);
1484 if (WARN_ON_ONCE(*p + 2 > end))
1487 ceph_encode_8(p, 1); /* version */
1488 ceph_encode_8(p, 1); /* compat */
1492 size_t size = METRIC_BYTES(count);
1494 if (WARN_ON_ONCE(*p + 4 + 4 + size > end))
1497 /* metric spec info length */
1498 ceph_encode_32(p, 4 + size);
1501 ceph_encode_32(p, size);
1502 memset(*p, 0, size);
1503 for (i = 0; i < count; i++)
1504 ((unsigned char *)(*p))[i / 8] |= BIT(metric_bits[i] % 8);
1507 if (WARN_ON_ONCE(*p + 4 + 4 > end))
1510 /* metric spec info length */
1511 ceph_encode_32(p, 4);
1513 ceph_encode_32(p, 0);
1520 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1521 * to include additional client metadata fields.
1523 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1525 struct ceph_msg *msg;
1526 struct ceph_mds_session_head *h;
1528 int extra_bytes = 0;
1529 int metadata_key_count = 0;
1530 struct ceph_options *opt = mdsc->fsc->client->options;
1531 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1536 const char* metadata[][2] = {
1537 {"hostname", mdsc->nodename},
1538 {"kernel_version", init_utsname()->release},
1539 {"entity_id", opt->name ? : ""},
1540 {"root", fsopt->server_path ? : "/"},
1544 /* Calculate serialized length of metadata */
1545 extra_bytes = 4; /* map length */
1546 for (i = 0; metadata[i][0]; ++i) {
1547 extra_bytes += 8 + strlen(metadata[i][0]) +
1548 strlen(metadata[i][1]);
1549 metadata_key_count++;
1552 /* supported feature */
1554 count = ARRAY_SIZE(feature_bits);
1556 size = FEATURE_BYTES(count);
1557 extra_bytes += 4 + size;
1561 count = ARRAY_SIZE(metric_bits);
1563 size = METRIC_BYTES(count);
1564 extra_bytes += 2 + 4 + 4 + size;
1566 /* Allocate the message */
1567 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1570 pr_err("ENOMEM creating session open msg\n");
1571 return ERR_PTR(-ENOMEM);
1573 p = msg->front.iov_base;
1574 end = p + msg->front.iov_len;
1577 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1578 h->seq = cpu_to_le64(seq);
1581 * Serialize client metadata into waiting buffer space, using
1582 * the format that userspace expects for map<string, string>
1584 * ClientSession messages with metadata are v4
1586 msg->hdr.version = cpu_to_le16(4);
1587 msg->hdr.compat_version = cpu_to_le16(1);
1589 /* The write pointer, following the session_head structure */
1592 /* Number of entries in the map */
1593 ceph_encode_32(&p, metadata_key_count);
1595 /* Two length-prefixed strings for each entry in the map */
1596 for (i = 0; metadata[i][0]; ++i) {
1597 size_t const key_len = strlen(metadata[i][0]);
1598 size_t const val_len = strlen(metadata[i][1]);
1600 ceph_encode_32(&p, key_len);
1601 memcpy(p, metadata[i][0], key_len);
1603 ceph_encode_32(&p, val_len);
1604 memcpy(p, metadata[i][1], val_len);
1608 ret = encode_supported_features(&p, end);
1610 pr_err("encode_supported_features failed!\n");
1612 return ERR_PTR(ret);
1615 ret = encode_metric_spec(&p, end);
1617 pr_err("encode_metric_spec failed!\n");
1619 return ERR_PTR(ret);
1622 msg->front.iov_len = p - msg->front.iov_base;
1623 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1629 * send session open request.
1631 * called under mdsc->mutex
1633 static int __open_session(struct ceph_mds_client *mdsc,
1634 struct ceph_mds_session *session)
1636 struct ceph_msg *msg;
1638 int mds = session->s_mds;
1640 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO)
1643 /* wait for mds to go active? */
1644 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1645 dout("open_session to mds%d (%s)\n", mds,
1646 ceph_mds_state_name(mstate));
1647 session->s_state = CEPH_MDS_SESSION_OPENING;
1648 session->s_renew_requested = jiffies;
1650 /* send connect message */
1651 msg = create_session_open_msg(mdsc, session->s_seq);
1653 return PTR_ERR(msg);
1654 ceph_con_send(&session->s_con, msg);
1659 * open sessions for any export targets for the given mds
1661 * called under mdsc->mutex
1663 static struct ceph_mds_session *
1664 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1666 struct ceph_mds_session *session;
1669 session = __ceph_lookup_mds_session(mdsc, target);
1671 session = register_session(mdsc, target);
1672 if (IS_ERR(session))
1675 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1676 session->s_state == CEPH_MDS_SESSION_CLOSING) {
1677 ret = __open_session(mdsc, session);
1679 return ERR_PTR(ret);
1685 struct ceph_mds_session *
1686 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1688 struct ceph_mds_session *session;
1690 dout("open_export_target_session to mds%d\n", target);
1692 mutex_lock(&mdsc->mutex);
1693 session = __open_export_target_session(mdsc, target);
1694 mutex_unlock(&mdsc->mutex);
1699 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1700 struct ceph_mds_session *session)
1702 struct ceph_mds_info *mi;
1703 struct ceph_mds_session *ts;
1704 int i, mds = session->s_mds;
1706 if (mds >= mdsc->mdsmap->possible_max_rank)
1709 mi = &mdsc->mdsmap->m_info[mds];
1710 dout("open_export_target_sessions for mds%d (%d targets)\n",
1711 session->s_mds, mi->num_export_targets);
1713 for (i = 0; i < mi->num_export_targets; i++) {
1714 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1715 ceph_put_mds_session(ts);
1719 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1720 struct ceph_mds_session *session)
1722 mutex_lock(&mdsc->mutex);
1723 __open_export_target_sessions(mdsc, session);
1724 mutex_unlock(&mdsc->mutex);
1731 static void detach_cap_releases(struct ceph_mds_session *session,
1732 struct list_head *target)
1734 lockdep_assert_held(&session->s_cap_lock);
1736 list_splice_init(&session->s_cap_releases, target);
1737 session->s_num_cap_releases = 0;
1738 dout("dispose_cap_releases mds%d\n", session->s_mds);
1741 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1742 struct list_head *dispose)
1744 while (!list_empty(dispose)) {
1745 struct ceph_cap *cap;
1746 /* zero out the in-progress message */
1747 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1748 list_del(&cap->session_caps);
1749 ceph_put_cap(mdsc, cap);
1753 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1754 struct ceph_mds_session *session)
1756 struct ceph_mds_request *req;
1759 dout("cleanup_session_requests mds%d\n", session->s_mds);
1760 mutex_lock(&mdsc->mutex);
1761 while (!list_empty(&session->s_unsafe)) {
1762 req = list_first_entry(&session->s_unsafe,
1763 struct ceph_mds_request, r_unsafe_item);
1764 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1766 if (req->r_target_inode)
1767 mapping_set_error(req->r_target_inode->i_mapping, -EIO);
1768 if (req->r_unsafe_dir)
1769 mapping_set_error(req->r_unsafe_dir->i_mapping, -EIO);
1770 __unregister_request(mdsc, req);
1772 /* zero r_attempts, so kick_requests() will re-send requests */
1773 p = rb_first(&mdsc->request_tree);
1775 req = rb_entry(p, struct ceph_mds_request, r_node);
1777 if (req->r_session &&
1778 req->r_session->s_mds == session->s_mds)
1779 req->r_attempts = 0;
1781 mutex_unlock(&mdsc->mutex);
1785 * Helper to safely iterate over all caps associated with a session, with
1786 * special care taken to handle a racing __ceph_remove_cap().
1788 * Caller must hold session s_mutex.
1790 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1791 int (*cb)(struct inode *, int mds, void *),
1794 struct list_head *p;
1795 struct ceph_cap *cap;
1796 struct inode *inode, *last_inode = NULL;
1797 struct ceph_cap *old_cap = NULL;
1800 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1801 spin_lock(&session->s_cap_lock);
1802 p = session->s_caps.next;
1803 while (p != &session->s_caps) {
1806 cap = list_entry(p, struct ceph_cap, session_caps);
1807 inode = igrab(&cap->ci->netfs.inode);
1812 session->s_cap_iterator = cap;
1814 spin_unlock(&session->s_cap_lock);
1821 ceph_put_cap(session->s_mdsc, old_cap);
1825 ret = cb(inode, mds, arg);
1828 spin_lock(&session->s_cap_lock);
1831 dout("iterate_session_caps finishing cap %p removal\n",
1833 BUG_ON(cap->session != session);
1834 cap->session = NULL;
1835 list_del_init(&cap->session_caps);
1836 session->s_nr_caps--;
1837 atomic64_dec(&session->s_mdsc->metric.total_caps);
1838 if (cap->queue_release)
1839 __ceph_queue_cap_release(session, cap);
1841 old_cap = cap; /* put_cap it w/o locks held */
1848 session->s_cap_iterator = NULL;
1849 spin_unlock(&session->s_cap_lock);
1853 ceph_put_cap(session->s_mdsc, old_cap);
1858 static int remove_session_caps_cb(struct inode *inode, int mds, void *arg)
1860 struct ceph_inode_info *ci = ceph_inode(inode);
1861 bool invalidate = false;
1862 struct ceph_cap *cap;
1865 spin_lock(&ci->i_ceph_lock);
1866 cap = __get_cap_for_mds(ci, mds);
1868 dout(" removing cap %p, ci is %p, inode is %p\n",
1869 cap, ci, &ci->netfs.inode);
1871 iputs = ceph_purge_inode_cap(inode, cap, &invalidate);
1873 spin_unlock(&ci->i_ceph_lock);
1876 wake_up_all(&ci->i_cap_wq);
1878 ceph_queue_invalidate(inode);
1885 * caller must hold session s_mutex
1887 static void remove_session_caps(struct ceph_mds_session *session)
1889 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1890 struct super_block *sb = fsc->sb;
1893 dout("remove_session_caps on %p\n", session);
1894 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1896 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1898 spin_lock(&session->s_cap_lock);
1899 if (session->s_nr_caps > 0) {
1900 struct inode *inode;
1901 struct ceph_cap *cap, *prev = NULL;
1902 struct ceph_vino vino;
1904 * iterate_session_caps() skips inodes that are being
1905 * deleted, we need to wait until deletions are complete.
1906 * __wait_on_freeing_inode() is designed for the job,
1907 * but it is not exported, so use lookup inode function
1910 while (!list_empty(&session->s_caps)) {
1911 cap = list_entry(session->s_caps.next,
1912 struct ceph_cap, session_caps);
1916 vino = cap->ci->i_vino;
1917 spin_unlock(&session->s_cap_lock);
1919 inode = ceph_find_inode(sb, vino);
1922 spin_lock(&session->s_cap_lock);
1926 // drop cap expires and unlock s_cap_lock
1927 detach_cap_releases(session, &dispose);
1929 BUG_ON(session->s_nr_caps > 0);
1930 BUG_ON(!list_empty(&session->s_cap_flushing));
1931 spin_unlock(&session->s_cap_lock);
1932 dispose_cap_releases(session->s_mdsc, &dispose);
1942 * wake up any threads waiting on this session's caps. if the cap is
1943 * old (didn't get renewed on the client reconnect), remove it now.
1945 * caller must hold s_mutex.
1947 static int wake_up_session_cb(struct inode *inode, int mds, void *arg)
1949 struct ceph_inode_info *ci = ceph_inode(inode);
1950 unsigned long ev = (unsigned long)arg;
1952 if (ev == RECONNECT) {
1953 spin_lock(&ci->i_ceph_lock);
1954 ci->i_wanted_max_size = 0;
1955 ci->i_requested_max_size = 0;
1956 spin_unlock(&ci->i_ceph_lock);
1957 } else if (ev == RENEWCAPS) {
1958 struct ceph_cap *cap;
1960 spin_lock(&ci->i_ceph_lock);
1961 cap = __get_cap_for_mds(ci, mds);
1962 /* mds did not re-issue stale cap */
1963 if (cap && cap->cap_gen < atomic_read(&cap->session->s_cap_gen))
1964 cap->issued = cap->implemented = CEPH_CAP_PIN;
1965 spin_unlock(&ci->i_ceph_lock);
1966 } else if (ev == FORCE_RO) {
1968 wake_up_all(&ci->i_cap_wq);
1972 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1974 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1975 ceph_iterate_session_caps(session, wake_up_session_cb,
1976 (void *)(unsigned long)ev);
1980 * Send periodic message to MDS renewing all currently held caps. The
1981 * ack will reset the expiration for all caps from this session.
1983 * caller holds s_mutex
1985 static int send_renew_caps(struct ceph_mds_client *mdsc,
1986 struct ceph_mds_session *session)
1988 struct ceph_msg *msg;
1991 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1992 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1993 pr_info("mds%d caps stale\n", session->s_mds);
1994 session->s_renew_requested = jiffies;
1996 /* do not try to renew caps until a recovering mds has reconnected
1997 * with its clients. */
1998 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1999 if (state < CEPH_MDS_STATE_RECONNECT) {
2000 dout("send_renew_caps ignoring mds%d (%s)\n",
2001 session->s_mds, ceph_mds_state_name(state));
2005 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
2006 ceph_mds_state_name(state));
2007 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
2008 ++session->s_renew_seq);
2011 ceph_con_send(&session->s_con, msg);
2015 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
2016 struct ceph_mds_session *session, u64 seq)
2018 struct ceph_msg *msg;
2020 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
2021 session->s_mds, ceph_session_state_name(session->s_state), seq);
2022 msg = ceph_create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
2025 ceph_con_send(&session->s_con, msg);
2031 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
2033 * Called under session->s_mutex
2035 static void renewed_caps(struct ceph_mds_client *mdsc,
2036 struct ceph_mds_session *session, int is_renew)
2041 spin_lock(&session->s_cap_lock);
2042 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
2044 session->s_cap_ttl = session->s_renew_requested +
2045 mdsc->mdsmap->m_session_timeout*HZ;
2048 if (time_before(jiffies, session->s_cap_ttl)) {
2049 pr_info("mds%d caps renewed\n", session->s_mds);
2052 pr_info("mds%d caps still stale\n", session->s_mds);
2055 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
2056 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
2057 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
2058 spin_unlock(&session->s_cap_lock);
2061 wake_up_session_caps(session, RENEWCAPS);
2065 * send a session close request
2067 static int request_close_session(struct ceph_mds_session *session)
2069 struct ceph_msg *msg;
2071 dout("request_close_session mds%d state %s seq %lld\n",
2072 session->s_mds, ceph_session_state_name(session->s_state),
2074 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_CLOSE,
2078 ceph_con_send(&session->s_con, msg);
2083 * Called with s_mutex held.
2085 static int __close_session(struct ceph_mds_client *mdsc,
2086 struct ceph_mds_session *session)
2088 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
2090 session->s_state = CEPH_MDS_SESSION_CLOSING;
2091 return request_close_session(session);
2094 static bool drop_negative_children(struct dentry *dentry)
2096 struct dentry *child;
2097 bool all_negative = true;
2099 if (!d_is_dir(dentry))
2102 spin_lock(&dentry->d_lock);
2103 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
2104 if (d_really_is_positive(child)) {
2105 all_negative = false;
2109 spin_unlock(&dentry->d_lock);
2112 shrink_dcache_parent(dentry);
2114 return all_negative;
2118 * Trim old(er) caps.
2120 * Because we can't cache an inode without one or more caps, we do
2121 * this indirectly: if a cap is unused, we prune its aliases, at which
2122 * point the inode will hopefully get dropped to.
2124 * Yes, this is a bit sloppy. Our only real goal here is to respond to
2125 * memory pressure from the MDS, though, so it needn't be perfect.
2127 static int trim_caps_cb(struct inode *inode, int mds, void *arg)
2129 int *remaining = arg;
2130 struct ceph_inode_info *ci = ceph_inode(inode);
2131 int used, wanted, oissued, mine;
2132 struct ceph_cap *cap;
2134 if (*remaining <= 0)
2137 spin_lock(&ci->i_ceph_lock);
2138 cap = __get_cap_for_mds(ci, mds);
2140 spin_unlock(&ci->i_ceph_lock);
2143 mine = cap->issued | cap->implemented;
2144 used = __ceph_caps_used(ci);
2145 wanted = __ceph_caps_file_wanted(ci);
2146 oissued = __ceph_caps_issued_other(ci, cap);
2148 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
2149 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
2150 ceph_cap_string(used), ceph_cap_string(wanted));
2151 if (cap == ci->i_auth_cap) {
2152 if (ci->i_dirty_caps || ci->i_flushing_caps ||
2153 !list_empty(&ci->i_cap_snaps))
2155 if ((used | wanted) & CEPH_CAP_ANY_WR)
2157 /* Note: it's possible that i_filelock_ref becomes non-zero
2158 * after dropping auth caps. It doesn't hurt because reply
2159 * of lock mds request will re-add auth caps. */
2160 if (atomic_read(&ci->i_filelock_ref) > 0)
2163 /* The inode has cached pages, but it's no longer used.
2164 * we can safely drop it */
2165 if (S_ISREG(inode->i_mode) &&
2166 wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
2167 !(oissued & CEPH_CAP_FILE_CACHE)) {
2171 if ((used | wanted) & ~oissued & mine)
2172 goto out; /* we need these caps */
2175 /* we aren't the only cap.. just remove us */
2176 ceph_remove_cap(cap, true);
2179 struct dentry *dentry;
2180 /* try dropping referring dentries */
2181 spin_unlock(&ci->i_ceph_lock);
2182 dentry = d_find_any_alias(inode);
2183 if (dentry && drop_negative_children(dentry)) {
2186 d_prune_aliases(inode);
2187 count = atomic_read(&inode->i_count);
2190 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
2199 spin_unlock(&ci->i_ceph_lock);
2204 * Trim session cap count down to some max number.
2206 int ceph_trim_caps(struct ceph_mds_client *mdsc,
2207 struct ceph_mds_session *session,
2210 int trim_caps = session->s_nr_caps - max_caps;
2212 dout("trim_caps mds%d start: %d / %d, trim %d\n",
2213 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
2214 if (trim_caps > 0) {
2215 int remaining = trim_caps;
2217 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
2218 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
2219 session->s_mds, session->s_nr_caps, max_caps,
2220 trim_caps - remaining);
2223 ceph_flush_cap_releases(mdsc, session);
2227 static int check_caps_flush(struct ceph_mds_client *mdsc,
2232 spin_lock(&mdsc->cap_dirty_lock);
2233 if (!list_empty(&mdsc->cap_flush_list)) {
2234 struct ceph_cap_flush *cf =
2235 list_first_entry(&mdsc->cap_flush_list,
2236 struct ceph_cap_flush, g_list);
2237 if (cf->tid <= want_flush_tid) {
2238 dout("check_caps_flush still flushing tid "
2239 "%llu <= %llu\n", cf->tid, want_flush_tid);
2243 spin_unlock(&mdsc->cap_dirty_lock);
2248 * flush all dirty inode data to disk.
2250 * returns true if we've flushed through want_flush_tid
2252 static void wait_caps_flush(struct ceph_mds_client *mdsc,
2255 dout("check_caps_flush want %llu\n", want_flush_tid);
2257 wait_event(mdsc->cap_flushing_wq,
2258 check_caps_flush(mdsc, want_flush_tid));
2260 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
2264 * called under s_mutex
2266 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
2267 struct ceph_mds_session *session)
2269 struct ceph_msg *msg = NULL;
2270 struct ceph_mds_cap_release *head;
2271 struct ceph_mds_cap_item *item;
2272 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
2273 struct ceph_cap *cap;
2274 LIST_HEAD(tmp_list);
2275 int num_cap_releases;
2276 __le32 barrier, *cap_barrier;
2278 down_read(&osdc->lock);
2279 barrier = cpu_to_le32(osdc->epoch_barrier);
2280 up_read(&osdc->lock);
2282 spin_lock(&session->s_cap_lock);
2284 list_splice_init(&session->s_cap_releases, &tmp_list);
2285 num_cap_releases = session->s_num_cap_releases;
2286 session->s_num_cap_releases = 0;
2287 spin_unlock(&session->s_cap_lock);
2289 while (!list_empty(&tmp_list)) {
2291 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
2292 PAGE_SIZE, GFP_NOFS, false);
2295 head = msg->front.iov_base;
2296 head->num = cpu_to_le32(0);
2297 msg->front.iov_len = sizeof(*head);
2299 msg->hdr.version = cpu_to_le16(2);
2300 msg->hdr.compat_version = cpu_to_le16(1);
2303 cap = list_first_entry(&tmp_list, struct ceph_cap,
2305 list_del(&cap->session_caps);
2308 head = msg->front.iov_base;
2309 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
2311 item = msg->front.iov_base + msg->front.iov_len;
2312 item->ino = cpu_to_le64(cap->cap_ino);
2313 item->cap_id = cpu_to_le64(cap->cap_id);
2314 item->migrate_seq = cpu_to_le32(cap->mseq);
2315 item->seq = cpu_to_le32(cap->issue_seq);
2316 msg->front.iov_len += sizeof(*item);
2318 ceph_put_cap(mdsc, cap);
2320 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
2321 // Append cap_barrier field
2322 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2323 *cap_barrier = barrier;
2324 msg->front.iov_len += sizeof(*cap_barrier);
2326 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2327 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2328 ceph_con_send(&session->s_con, msg);
2333 BUG_ON(num_cap_releases != 0);
2335 spin_lock(&session->s_cap_lock);
2336 if (!list_empty(&session->s_cap_releases))
2338 spin_unlock(&session->s_cap_lock);
2341 // Append cap_barrier field
2342 cap_barrier = msg->front.iov_base + msg->front.iov_len;
2343 *cap_barrier = barrier;
2344 msg->front.iov_len += sizeof(*cap_barrier);
2346 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2347 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
2348 ceph_con_send(&session->s_con, msg);
2352 pr_err("send_cap_releases mds%d, failed to allocate message\n",
2354 spin_lock(&session->s_cap_lock);
2355 list_splice(&tmp_list, &session->s_cap_releases);
2356 session->s_num_cap_releases += num_cap_releases;
2357 spin_unlock(&session->s_cap_lock);
2360 static void ceph_cap_release_work(struct work_struct *work)
2362 struct ceph_mds_session *session =
2363 container_of(work, struct ceph_mds_session, s_cap_release_work);
2365 mutex_lock(&session->s_mutex);
2366 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
2367 session->s_state == CEPH_MDS_SESSION_HUNG)
2368 ceph_send_cap_releases(session->s_mdsc, session);
2369 mutex_unlock(&session->s_mutex);
2370 ceph_put_mds_session(session);
2373 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
2374 struct ceph_mds_session *session)
2379 ceph_get_mds_session(session);
2380 if (queue_work(mdsc->fsc->cap_wq,
2381 &session->s_cap_release_work)) {
2382 dout("cap release work queued\n");
2384 ceph_put_mds_session(session);
2385 dout("failed to queue cap release work\n");
2390 * caller holds session->s_cap_lock
2392 void __ceph_queue_cap_release(struct ceph_mds_session *session,
2393 struct ceph_cap *cap)
2395 list_add_tail(&cap->session_caps, &session->s_cap_releases);
2396 session->s_num_cap_releases++;
2398 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
2399 ceph_flush_cap_releases(session->s_mdsc, session);
2402 static void ceph_cap_reclaim_work(struct work_struct *work)
2404 struct ceph_mds_client *mdsc =
2405 container_of(work, struct ceph_mds_client, cap_reclaim_work);
2406 int ret = ceph_trim_dentries(mdsc);
2408 ceph_queue_cap_reclaim_work(mdsc);
2411 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2416 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2417 dout("caps reclaim work queued\n");
2419 dout("failed to queue caps release work\n");
2423 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2428 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2429 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2430 atomic_set(&mdsc->cap_reclaim_pending, 0);
2431 ceph_queue_cap_reclaim_work(mdsc);
2439 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2442 struct ceph_inode_info *ci = ceph_inode(dir);
2443 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2444 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2445 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2446 unsigned int num_entries;
2449 spin_lock(&ci->i_ceph_lock);
2450 num_entries = ci->i_files + ci->i_subdirs;
2451 spin_unlock(&ci->i_ceph_lock);
2452 num_entries = max(num_entries, 1U);
2453 num_entries = min(num_entries, opt->max_readdir);
2455 order = get_order(size * num_entries);
2456 while (order >= 0) {
2457 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2461 if (rinfo->dir_entries)
2465 if (!rinfo->dir_entries)
2468 num_entries = (PAGE_SIZE << order) / size;
2469 num_entries = min(num_entries, opt->max_readdir);
2471 rinfo->dir_buf_size = PAGE_SIZE << order;
2472 req->r_num_caps = num_entries + 1;
2473 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2474 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2479 * Create an mds request.
2481 struct ceph_mds_request *
2482 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2484 struct ceph_mds_request *req;
2486 req = kmem_cache_zalloc(ceph_mds_request_cachep, GFP_NOFS);
2488 return ERR_PTR(-ENOMEM);
2490 mutex_init(&req->r_fill_mutex);
2492 req->r_started = jiffies;
2493 req->r_start_latency = ktime_get();
2494 req->r_resend_mds = -1;
2495 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2496 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2498 req->r_feature_needed = -1;
2499 kref_init(&req->r_kref);
2500 RB_CLEAR_NODE(&req->r_node);
2501 INIT_LIST_HEAD(&req->r_wait);
2502 init_completion(&req->r_completion);
2503 init_completion(&req->r_safe_completion);
2504 INIT_LIST_HEAD(&req->r_unsafe_item);
2506 ktime_get_coarse_real_ts64(&req->r_stamp);
2509 req->r_direct_mode = mode;
2514 * return oldest (lowest) request, tid in request tree, 0 if none.
2516 * called under mdsc->mutex.
2518 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2520 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2522 return rb_entry(rb_first(&mdsc->request_tree),
2523 struct ceph_mds_request, r_node);
2526 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2528 return mdsc->oldest_tid;
2531 #if IS_ENABLED(CONFIG_FS_ENCRYPTION)
2532 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2534 struct inode *dir = req->r_parent;
2535 struct dentry *dentry = req->r_dentry;
2536 u8 *cryptbuf = NULL;
2540 /* only encode if we have parent and dentry */
2541 if (!dir || !dentry)
2544 /* No-op unless this is encrypted */
2545 if (!IS_ENCRYPTED(dir))
2548 ret = ceph_fscrypt_prepare_readdir(dir);
2550 return ERR_PTR(ret);
2552 /* No key? Just ignore it. */
2553 if (!fscrypt_has_encryption_key(dir))
2556 if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX,
2559 return ERR_PTR(-ENAMETOOLONG);
2562 /* No need to append altname if name is short enough */
2563 if (len <= CEPH_NOHASH_NAME_MAX) {
2568 cryptbuf = kmalloc(len, GFP_KERNEL);
2570 return ERR_PTR(-ENOMEM);
2572 ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len);
2575 return ERR_PTR(ret);
2582 static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen)
2590 * ceph_mdsc_build_path - build a path string to a given dentry
2591 * @dentry: dentry to which path should be built
2592 * @plen: returned length of string
2593 * @pbase: returned base inode number
2594 * @for_wire: is this path going to be sent to the MDS?
2596 * Build a string that represents the path to the dentry. This is mostly called
2597 * for two different purposes:
2599 * 1) we need to build a path string to send to the MDS (for_wire == true)
2600 * 2) we need a path string for local presentation (e.g. debugfs)
2601 * (for_wire == false)
2603 * The path is built in reverse, starting with the dentry. Walk back up toward
2604 * the root, building the path until the first non-snapped inode is reached
2605 * (for_wire) or the root inode is reached (!for_wire).
2607 * Encode hidden .snap dirs as a double /, i.e.
2608 * foo/.snap/bar -> foo//bar
2610 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2614 struct inode *inode;
2621 return ERR_PTR(-EINVAL);
2625 return ERR_PTR(-ENOMEM);
2630 seq = read_seqbegin(&rename_lock);
2633 struct dentry *parent;
2635 spin_lock(&cur->d_lock);
2636 inode = d_inode(cur);
2637 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2638 dout("build_path path+%d: %p SNAPDIR\n",
2640 spin_unlock(&cur->d_lock);
2641 parent = dget_parent(cur);
2642 } else if (for_wire && inode && dentry != cur &&
2643 ceph_snap(inode) == CEPH_NOSNAP) {
2644 spin_unlock(&cur->d_lock);
2645 pos++; /* get rid of any prepended '/' */
2647 } else if (!for_wire || !IS_ENCRYPTED(d_inode(cur->d_parent))) {
2648 pos -= cur->d_name.len;
2650 spin_unlock(&cur->d_lock);
2653 memcpy(path + pos, cur->d_name.name, cur->d_name.len);
2654 spin_unlock(&cur->d_lock);
2655 parent = dget_parent(cur);
2661 * Proactively copy name into buf, in case we need to
2664 memcpy(buf, cur->d_name.name, cur->d_name.len);
2665 len = cur->d_name.len;
2666 spin_unlock(&cur->d_lock);
2667 parent = dget_parent(cur);
2669 ret = ceph_fscrypt_prepare_readdir(d_inode(parent));
2673 return ERR_PTR(ret);
2676 if (fscrypt_has_encryption_key(d_inode(parent))) {
2677 len = ceph_encode_encrypted_fname(d_inode(parent),
2682 return ERR_PTR(len);
2690 memcpy(path + pos, buf, len);
2695 /* Are we at the root? */
2699 /* Are we out of buffer? */
2705 inode = d_inode(cur);
2706 base = inode ? ceph_ino(inode) : 0;
2709 if (read_seqretry(&rename_lock, seq))
2714 * A rename didn't occur, but somehow we didn't end up where
2715 * we thought we would. Throw a warning and try again.
2717 pr_warn("build_path did not end path lookup where expected (pos = %d)\n",
2723 *plen = PATH_MAX - 1 - pos;
2724 dout("build_path on %p %d built %llx '%.*s'\n",
2725 dentry, d_count(dentry), base, *plen, path + pos);
2729 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2730 const char **ppath, int *ppathlen, u64 *pino,
2731 bool *pfreepath, bool parent_locked)
2737 dir = d_inode_rcu(dentry->d_parent);
2738 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP &&
2739 !IS_ENCRYPTED(dir)) {
2740 *pino = ceph_ino(dir);
2742 *ppath = dentry->d_name.name;
2743 *ppathlen = dentry->d_name.len;
2747 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2749 return PTR_ERR(path);
2755 static int build_inode_path(struct inode *inode,
2756 const char **ppath, int *ppathlen, u64 *pino,
2759 struct dentry *dentry;
2762 if (ceph_snap(inode) == CEPH_NOSNAP) {
2763 *pino = ceph_ino(inode);
2767 dentry = d_find_alias(inode);
2768 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2771 return PTR_ERR(path);
2778 * request arguments may be specified via an inode *, a dentry *, or
2779 * an explicit ino+path.
2781 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2782 struct inode *rdiri, const char *rpath,
2783 u64 rino, const char **ppath, int *pathlen,
2784 u64 *ino, bool *freepath, bool parent_locked)
2789 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2790 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2792 } else if (rdentry) {
2793 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2794 freepath, parent_locked);
2795 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2797 } else if (rpath || rino) {
2800 *pathlen = rpath ? strlen(rpath) : 0;
2801 dout(" path %.*s\n", *pathlen, rpath);
2807 static void encode_mclientrequest_tail(void **p,
2808 const struct ceph_mds_request *req)
2810 struct ceph_timespec ts;
2813 ceph_encode_timespec64(&ts, &req->r_stamp);
2814 ceph_encode_copy(p, &ts, sizeof(ts));
2817 ceph_encode_32(p, req->r_cred->group_info->ngroups);
2818 for (i = 0; i < req->r_cred->group_info->ngroups; i++)
2819 ceph_encode_64(p, from_kgid(&init_user_ns,
2820 req->r_cred->group_info->gid[i]));
2823 ceph_encode_32(p, req->r_altname_len);
2824 ceph_encode_copy(p, req->r_altname, req->r_altname_len);
2826 /* v6: fscrypt_auth and fscrypt_file */
2827 if (req->r_fscrypt_auth) {
2828 u32 authlen = ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2830 ceph_encode_32(p, authlen);
2831 ceph_encode_copy(p, req->r_fscrypt_auth, authlen);
2833 ceph_encode_32(p, 0);
2835 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags)) {
2836 ceph_encode_32(p, sizeof(__le64));
2837 ceph_encode_64(p, req->r_fscrypt_file);
2839 ceph_encode_32(p, 0);
2844 * called under mdsc->mutex
2846 static struct ceph_msg *create_request_message(struct ceph_mds_session *session,
2847 struct ceph_mds_request *req,
2848 bool drop_cap_releases)
2850 int mds = session->s_mds;
2851 struct ceph_mds_client *mdsc = session->s_mdsc;
2852 struct ceph_msg *msg;
2853 struct ceph_mds_request_head_old *head;
2854 const char *path1 = NULL;
2855 const char *path2 = NULL;
2856 u64 ino1 = 0, ino2 = 0;
2857 int pathlen1 = 0, pathlen2 = 0;
2858 bool freepath1 = false, freepath2 = false;
2859 struct dentry *old_dentry = NULL;
2864 bool legacy = !(session->s_con.peer_features & CEPH_FEATURE_FS_BTIME);
2866 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2867 req->r_parent, req->r_path1, req->r_ino1.ino,
2868 &path1, &pathlen1, &ino1, &freepath1,
2869 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2870 &req->r_req_flags));
2876 /* If r_old_dentry is set, then assume that its parent is locked */
2877 if (req->r_old_dentry &&
2878 !(req->r_old_dentry->d_flags & DCACHE_DISCONNECTED))
2879 old_dentry = req->r_old_dentry;
2880 ret = set_request_path_attr(NULL, old_dentry,
2881 req->r_old_dentry_dir,
2882 req->r_path2, req->r_ino2.ino,
2883 &path2, &pathlen2, &ino2, &freepath2, true);
2889 req->r_altname = get_fscrypt_altname(req, &req->r_altname_len);
2890 if (IS_ERR(req->r_altname)) {
2891 msg = ERR_CAST(req->r_altname);
2892 req->r_altname = NULL;
2896 len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head);
2899 len += 2 * (1 + sizeof(u32) + sizeof(u64));
2900 len += pathlen1 + pathlen2;
2903 len += sizeof(struct ceph_mds_request_release) *
2904 (!!req->r_inode_drop + !!req->r_dentry_drop +
2905 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2907 if (req->r_dentry_drop)
2909 if (req->r_old_dentry_drop)
2912 /* MClientRequest tail */
2915 len += sizeof(struct ceph_timespec);
2918 len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups);
2920 /* alternate name */
2921 len += sizeof(u32) + req->r_altname_len;
2924 len += sizeof(u32); // fscrypt_auth
2925 if (req->r_fscrypt_auth)
2926 len += ceph_fscrypt_auth_len(req->r_fscrypt_auth);
2930 if (test_bit(CEPH_MDS_R_FSCRYPT_FILE, &req->r_req_flags))
2931 len += sizeof(__le64);
2933 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2935 msg = ERR_PTR(-ENOMEM);
2939 msg->hdr.tid = cpu_to_le64(req->r_tid);
2942 * The old ceph_mds_request_head didn't contain a version field, and
2943 * one was added when we moved the message version from 3->4.
2946 msg->hdr.version = cpu_to_le16(3);
2947 head = msg->front.iov_base;
2948 p = msg->front.iov_base + sizeof(*head);
2950 struct ceph_mds_request_head *new_head = msg->front.iov_base;
2952 msg->hdr.version = cpu_to_le16(6);
2953 new_head->version = cpu_to_le16(CEPH_MDS_REQUEST_HEAD_VERSION);
2954 head = (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
2955 p = msg->front.iov_base + sizeof(*new_head);
2958 end = msg->front.iov_base + msg->front.iov_len;
2960 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2961 head->op = cpu_to_le32(req->r_op);
2962 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns,
2963 req->r_cred->fsuid));
2964 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns,
2965 req->r_cred->fsgid));
2966 head->ino = cpu_to_le64(req->r_deleg_ino);
2967 head->args = req->r_args;
2969 ceph_encode_filepath(&p, end, ino1, path1);
2970 ceph_encode_filepath(&p, end, ino2, path2);
2972 /* make note of release offset, in case we need to replay */
2973 req->r_request_release_offset = p - msg->front.iov_base;
2977 if (req->r_inode_drop)
2978 releases += ceph_encode_inode_release(&p,
2979 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2980 mds, req->r_inode_drop, req->r_inode_unless,
2981 req->r_op == CEPH_MDS_OP_READDIR);
2982 if (req->r_dentry_drop) {
2983 ret = ceph_encode_dentry_release(&p, req->r_dentry,
2984 req->r_parent, mds, req->r_dentry_drop,
2985 req->r_dentry_unless);
2990 if (req->r_old_dentry_drop) {
2991 ret = ceph_encode_dentry_release(&p, req->r_old_dentry,
2992 req->r_old_dentry_dir, mds,
2993 req->r_old_dentry_drop,
2994 req->r_old_dentry_unless);
2999 if (req->r_old_inode_drop)
3000 releases += ceph_encode_inode_release(&p,
3001 d_inode(req->r_old_dentry),
3002 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
3004 if (drop_cap_releases) {
3006 p = msg->front.iov_base + req->r_request_release_offset;
3009 head->num_releases = cpu_to_le16(releases);
3011 encode_mclientrequest_tail(&p, req);
3013 if (WARN_ON_ONCE(p > end)) {
3015 msg = ERR_PTR(-ERANGE);
3019 msg->front.iov_len = p - msg->front.iov_base;
3020 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3022 if (req->r_pagelist) {
3023 struct ceph_pagelist *pagelist = req->r_pagelist;
3024 ceph_msg_data_add_pagelist(msg, pagelist);
3025 msg->hdr.data_len = cpu_to_le32(pagelist->length);
3027 msg->hdr.data_len = 0;
3030 msg->hdr.data_off = cpu_to_le16(0);
3034 ceph_mdsc_free_path((char *)path2, pathlen2);
3037 ceph_mdsc_free_path((char *)path1, pathlen1);
3047 * called under mdsc->mutex if error, under no mutex if
3050 static void complete_request(struct ceph_mds_client *mdsc,
3051 struct ceph_mds_request *req)
3053 req->r_end_latency = ktime_get();
3055 if (req->r_callback)
3056 req->r_callback(mdsc, req);
3057 complete_all(&req->r_completion);
3060 static struct ceph_mds_request_head_old *
3061 find_old_request_head(void *p, u64 features)
3063 bool legacy = !(features & CEPH_FEATURE_FS_BTIME);
3064 struct ceph_mds_request_head *new_head;
3067 return (struct ceph_mds_request_head_old *)p;
3068 new_head = (struct ceph_mds_request_head *)p;
3069 return (struct ceph_mds_request_head_old *)&new_head->oldest_client_tid;
3073 * called under mdsc->mutex
3075 static int __prepare_send_request(struct ceph_mds_session *session,
3076 struct ceph_mds_request *req,
3077 bool drop_cap_releases)
3079 int mds = session->s_mds;
3080 struct ceph_mds_client *mdsc = session->s_mdsc;
3081 struct ceph_mds_request_head_old *rhead;
3082 struct ceph_msg *msg;
3083 int flags = 0, max_retry;
3086 * The type of 'r_attempts' in kernel 'ceph_mds_request'
3087 * is 'int', while in 'ceph_mds_request_head' the type of
3088 * 'num_retry' is '__u8'. So in case the request retries
3089 * exceeding 256 times, the MDS will receive a incorrect
3092 * In this case it's ususally a bug in MDS and continue
3093 * retrying the request makes no sense.
3095 * In future this could be fixed in ceph code, so avoid
3096 * using the hardcode here.
3098 max_retry = sizeof_field(struct ceph_mds_request_head, num_retry);
3099 max_retry = 1 << (max_retry * BITS_PER_BYTE);
3100 if (req->r_attempts >= max_retry) {
3101 pr_warn_ratelimited("%s request tid %llu seq overflow\n",
3102 __func__, req->r_tid);
3108 struct ceph_cap *cap =
3109 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
3112 req->r_sent_on_mseq = cap->mseq;
3114 req->r_sent_on_mseq = -1;
3116 dout("%s %p tid %lld %s (attempt %d)\n", __func__, req,
3117 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
3119 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3123 * Replay. Do not regenerate message (and rebuild
3124 * paths, etc.); just use the original message.
3125 * Rebuilding paths will break for renames because
3126 * d_move mangles the src name.
3128 msg = req->r_request;
3129 rhead = find_old_request_head(msg->front.iov_base,
3130 session->s_con.peer_features);
3132 flags = le32_to_cpu(rhead->flags);
3133 flags |= CEPH_MDS_FLAG_REPLAY;
3134 rhead->flags = cpu_to_le32(flags);
3136 if (req->r_target_inode)
3137 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
3139 rhead->num_retry = req->r_attempts - 1;
3141 /* remove cap/dentry releases from message */
3142 rhead->num_releases = 0;
3144 p = msg->front.iov_base + req->r_request_release_offset;
3145 encode_mclientrequest_tail(&p, req);
3147 msg->front.iov_len = p - msg->front.iov_base;
3148 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
3152 if (req->r_request) {
3153 ceph_msg_put(req->r_request);
3154 req->r_request = NULL;
3156 msg = create_request_message(session, req, drop_cap_releases);
3158 req->r_err = PTR_ERR(msg);
3159 return PTR_ERR(msg);
3161 req->r_request = msg;
3163 rhead = find_old_request_head(msg->front.iov_base,
3164 session->s_con.peer_features);
3165 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
3166 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3167 flags |= CEPH_MDS_FLAG_REPLAY;
3168 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags))
3169 flags |= CEPH_MDS_FLAG_ASYNC;
3171 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
3172 rhead->flags = cpu_to_le32(flags);
3173 rhead->num_fwd = req->r_num_fwd;
3174 rhead->num_retry = req->r_attempts - 1;
3176 dout(" r_parent = %p\n", req->r_parent);
3181 * called under mdsc->mutex
3183 static int __send_request(struct ceph_mds_session *session,
3184 struct ceph_mds_request *req,
3185 bool drop_cap_releases)
3189 err = __prepare_send_request(session, req, drop_cap_releases);
3191 ceph_msg_get(req->r_request);
3192 ceph_con_send(&session->s_con, req->r_request);
3199 * send request, or put it on the appropriate wait list.
3201 static void __do_request(struct ceph_mds_client *mdsc,
3202 struct ceph_mds_request *req)
3204 struct ceph_mds_session *session = NULL;
3209 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3210 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
3211 __unregister_request(mdsc, req);
3215 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_FENCE_IO) {
3216 dout("do_request metadata corrupted\n");
3220 if (req->r_timeout &&
3221 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
3222 dout("do_request timed out\n");
3226 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
3227 dout("do_request forced umount\n");
3231 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
3232 if (mdsc->mdsmap_err) {
3233 err = mdsc->mdsmap_err;
3234 dout("do_request mdsmap err %d\n", err);
3237 if (mdsc->mdsmap->m_epoch == 0) {
3238 dout("do_request no mdsmap, waiting for map\n");
3239 list_add(&req->r_wait, &mdsc->waiting_for_map);
3242 if (!(mdsc->fsc->mount_options->flags &
3243 CEPH_MOUNT_OPT_MOUNTWAIT) &&
3244 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
3245 err = -EHOSTUNREACH;
3250 put_request_session(req);
3252 mds = __choose_mds(mdsc, req, &random);
3254 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
3255 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3259 dout("do_request no mds or not active, waiting for map\n");
3260 list_add(&req->r_wait, &mdsc->waiting_for_map);
3264 /* get, open session */
3265 session = __ceph_lookup_mds_session(mdsc, mds);
3267 session = register_session(mdsc, mds);
3268 if (IS_ERR(session)) {
3269 err = PTR_ERR(session);
3273 req->r_session = ceph_get_mds_session(session);
3275 dout("do_request mds%d session %p state %s\n", mds, session,
3276 ceph_session_state_name(session->s_state));
3279 * The old ceph will crash the MDSs when see unknown OPs
3281 if (req->r_feature_needed > 0 &&
3282 !test_bit(req->r_feature_needed, &session->s_features)) {
3287 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
3288 session->s_state != CEPH_MDS_SESSION_HUNG) {
3290 * We cannot queue async requests since the caps and delegated
3291 * inodes are bound to the session. Just return -EJUKEBOX and
3292 * let the caller retry a sync request in that case.
3294 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags)) {
3300 * If the session has been REJECTED, then return a hard error,
3301 * unless it's a CLEANRECOVER mount, in which case we'll queue
3302 * it to the mdsc queue.
3304 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
3305 if (ceph_test_mount_opt(mdsc->fsc, CLEANRECOVER))
3306 list_add(&req->r_wait, &mdsc->waiting_for_map);
3312 if (session->s_state == CEPH_MDS_SESSION_NEW ||
3313 session->s_state == CEPH_MDS_SESSION_CLOSING) {
3314 err = __open_session(mdsc, session);
3317 /* retry the same mds later */
3319 req->r_resend_mds = mds;
3321 list_add(&req->r_wait, &session->s_waiting);
3326 req->r_resend_mds = -1; /* forget any previous mds hint */
3328 if (req->r_request_started == 0) /* note request start time */
3329 req->r_request_started = jiffies;
3332 * For async create we will choose the auth MDS of frag in parent
3333 * directory to send the request and ususally this works fine, but
3334 * if the migrated the dirtory to another MDS before it could handle
3335 * it the request will be forwarded.
3337 * And then the auth cap will be changed.
3339 if (test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) && req->r_num_fwd) {
3340 struct ceph_dentry_info *di = ceph_dentry(req->r_dentry);
3341 struct ceph_inode_info *ci;
3342 struct ceph_cap *cap;
3345 * The request maybe handled very fast and the new inode
3346 * hasn't been linked to the dentry yet. We need to wait
3347 * for the ceph_finish_async_create(), which shouldn't be
3348 * stuck too long or fail in thoery, to finish when forwarding
3351 if (!d_inode(req->r_dentry)) {
3352 err = wait_on_bit(&di->flags, CEPH_DENTRY_ASYNC_CREATE_BIT,
3355 mutex_lock(&req->r_fill_mutex);
3356 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3357 mutex_unlock(&req->r_fill_mutex);
3362 ci = ceph_inode(d_inode(req->r_dentry));
3364 spin_lock(&ci->i_ceph_lock);
3365 cap = ci->i_auth_cap;
3366 if (ci->i_ceph_flags & CEPH_I_ASYNC_CREATE && mds != cap->mds) {
3367 dout("do_request session changed for auth cap %d -> %d\n",
3368 cap->session->s_mds, session->s_mds);
3370 /* Remove the auth cap from old session */
3371 spin_lock(&cap->session->s_cap_lock);
3372 cap->session->s_nr_caps--;
3373 list_del_init(&cap->session_caps);
3374 spin_unlock(&cap->session->s_cap_lock);
3376 /* Add the auth cap to the new session */
3378 cap->session = session;
3379 spin_lock(&session->s_cap_lock);
3380 session->s_nr_caps++;
3381 list_add_tail(&cap->session_caps, &session->s_caps);
3382 spin_unlock(&session->s_cap_lock);
3384 change_auth_cap_ses(ci, session);
3386 spin_unlock(&ci->i_ceph_lock);
3389 err = __send_request(session, req, false);
3392 ceph_put_mds_session(session);
3395 dout("__do_request early error %d\n", err);
3397 complete_request(mdsc, req);
3398 __unregister_request(mdsc, req);
3404 * called under mdsc->mutex
3406 static void __wake_requests(struct ceph_mds_client *mdsc,
3407 struct list_head *head)
3409 struct ceph_mds_request *req;
3410 LIST_HEAD(tmp_list);
3412 list_splice_init(head, &tmp_list);
3414 while (!list_empty(&tmp_list)) {
3415 req = list_entry(tmp_list.next,
3416 struct ceph_mds_request, r_wait);
3417 list_del_init(&req->r_wait);
3418 dout(" wake request %p tid %llu\n", req, req->r_tid);
3419 __do_request(mdsc, req);
3424 * Wake up threads with requests pending for @mds, so that they can
3425 * resubmit their requests to a possibly different mds.
3427 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
3429 struct ceph_mds_request *req;
3430 struct rb_node *p = rb_first(&mdsc->request_tree);
3432 dout("kick_requests mds%d\n", mds);
3434 req = rb_entry(p, struct ceph_mds_request, r_node);
3436 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3438 if (req->r_attempts > 0)
3439 continue; /* only new requests */
3440 if (req->r_session &&
3441 req->r_session->s_mds == mds) {
3442 dout(" kicking tid %llu\n", req->r_tid);
3443 list_del_init(&req->r_wait);
3444 __do_request(mdsc, req);
3449 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
3450 struct ceph_mds_request *req)
3454 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
3456 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
3457 if (req->r_parent) {
3458 struct ceph_inode_info *ci = ceph_inode(req->r_parent);
3459 int fmode = (req->r_op & CEPH_MDS_OP_WRITE) ?
3460 CEPH_FILE_MODE_WR : CEPH_FILE_MODE_RD;
3461 spin_lock(&ci->i_ceph_lock);
3462 ceph_take_cap_refs(ci, CEPH_CAP_PIN, false);
3463 __ceph_touch_fmode(ci, mdsc, fmode);
3464 spin_unlock(&ci->i_ceph_lock);
3466 if (req->r_old_dentry_dir)
3467 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
3471 err = ceph_wait_on_async_create(req->r_inode);
3473 dout("%s: wait for async create returned: %d\n",
3479 if (!err && req->r_old_inode) {
3480 err = ceph_wait_on_async_create(req->r_old_inode);
3482 dout("%s: wait for async create returned: %d\n",
3488 dout("submit_request on %p for inode %p\n", req, dir);
3489 mutex_lock(&mdsc->mutex);
3490 __register_request(mdsc, req, dir);
3491 __do_request(mdsc, req);
3493 mutex_unlock(&mdsc->mutex);
3497 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
3498 struct ceph_mds_request *req,
3499 ceph_mds_request_wait_callback_t wait_func)
3504 dout("do_request waiting\n");
3506 err = wait_func(mdsc, req);
3508 long timeleft = wait_for_completion_killable_timeout(
3510 ceph_timeout_jiffies(req->r_timeout));
3514 err = -ETIMEDOUT; /* timed out */
3516 err = timeleft; /* killed */
3518 dout("do_request waited, got %d\n", err);
3519 mutex_lock(&mdsc->mutex);
3521 /* only abort if we didn't race with a real reply */
3522 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
3523 err = le32_to_cpu(req->r_reply_info.head->result);
3524 } else if (err < 0) {
3525 dout("aborted request %lld with %d\n", req->r_tid, err);
3528 * ensure we aren't running concurrently with
3529 * ceph_fill_trace or ceph_readdir_prepopulate, which
3530 * rely on locks (dir mutex) held by our caller.
3532 mutex_lock(&req->r_fill_mutex);
3534 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3535 mutex_unlock(&req->r_fill_mutex);
3537 if (req->r_parent &&
3538 (req->r_op & CEPH_MDS_OP_WRITE))
3539 ceph_invalidate_dir_request(req);
3544 mutex_unlock(&mdsc->mutex);
3549 * Synchrously perform an mds request. Take care of all of the
3550 * session setup, forwarding, retry details.
3552 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
3554 struct ceph_mds_request *req)
3558 dout("do_request on %p\n", req);
3561 err = ceph_mdsc_submit_request(mdsc, dir, req);
3563 err = ceph_mdsc_wait_request(mdsc, req, NULL);
3564 dout("do_request %p done, result %d\n", req, err);
3569 * Invalidate dir's completeness, dentry lease state on an aborted MDS
3570 * namespace request.
3572 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
3574 struct inode *dir = req->r_parent;
3575 struct inode *old_dir = req->r_old_dentry_dir;
3577 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
3579 ceph_dir_clear_complete(dir);
3581 ceph_dir_clear_complete(old_dir);
3583 ceph_invalidate_dentry_lease(req->r_dentry);
3584 if (req->r_old_dentry)
3585 ceph_invalidate_dentry_lease(req->r_old_dentry);
3591 * We take the session mutex and parse and process the reply immediately.
3592 * This preserves the logical ordering of replies, capabilities, etc., sent
3593 * by the MDS as they are applied to our local cache.
3595 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
3597 struct ceph_mds_client *mdsc = session->s_mdsc;
3598 struct ceph_mds_request *req;
3599 struct ceph_mds_reply_head *head = msg->front.iov_base;
3600 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
3601 struct ceph_snap_realm *realm;
3604 int mds = session->s_mds;
3605 bool close_sessions = false;
3607 if (msg->front.iov_len < sizeof(*head)) {
3608 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
3613 /* get request, session */
3614 tid = le64_to_cpu(msg->hdr.tid);
3615 mutex_lock(&mdsc->mutex);
3616 req = lookup_get_request(mdsc, tid);
3618 dout("handle_reply on unknown tid %llu\n", tid);
3619 mutex_unlock(&mdsc->mutex);
3622 dout("handle_reply %p\n", req);
3624 /* correct session? */
3625 if (req->r_session != session) {
3626 pr_err("mdsc_handle_reply got %llu on session mds%d"
3627 " not mds%d\n", tid, session->s_mds,
3628 req->r_session ? req->r_session->s_mds : -1);
3629 mutex_unlock(&mdsc->mutex);
3634 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
3635 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
3636 pr_warn("got a dup %s reply on %llu from mds%d\n",
3637 head->safe ? "safe" : "unsafe", tid, mds);
3638 mutex_unlock(&mdsc->mutex);
3641 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
3642 pr_warn("got unsafe after safe on %llu from mds%d\n",
3644 mutex_unlock(&mdsc->mutex);
3648 result = le32_to_cpu(head->result);
3651 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
3652 __unregister_request(mdsc, req);
3654 /* last request during umount? */
3655 if (mdsc->stopping && !__get_oldest_req(mdsc))
3656 complete_all(&mdsc->safe_umount_waiters);
3658 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3660 * We already handled the unsafe response, now do the
3661 * cleanup. No need to examine the response; the MDS
3662 * doesn't include any result info in the safe
3663 * response. And even if it did, there is nothing
3664 * useful we could do with a revised return value.
3666 dout("got safe reply %llu, mds%d\n", tid, mds);
3668 mutex_unlock(&mdsc->mutex);
3672 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
3673 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
3676 dout("handle_reply tid %lld result %d\n", tid, result);
3677 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
3678 err = parse_reply_info(session, msg, req, (u64)-1);
3680 err = parse_reply_info(session, msg, req,
3681 session->s_con.peer_features);
3682 mutex_unlock(&mdsc->mutex);
3684 /* Must find target inode outside of mutexes to avoid deadlocks */
3685 rinfo = &req->r_reply_info;
3686 if ((err >= 0) && rinfo->head->is_target) {
3687 struct inode *in = xchg(&req->r_new_inode, NULL);
3688 struct ceph_vino tvino = {
3689 .ino = le64_to_cpu(rinfo->targeti.in->ino),
3690 .snap = le64_to_cpu(rinfo->targeti.in->snapid)
3694 * If we ended up opening an existing inode, discard
3697 if (req->r_op == CEPH_MDS_OP_CREATE &&
3698 !req->r_reply_info.has_create_ino) {
3699 /* This should never happen on an async create */
3700 WARN_ON_ONCE(req->r_deleg_ino);
3705 in = ceph_get_inode(mdsc->fsc->sb, tvino, in);
3708 mutex_lock(&session->s_mutex);
3711 req->r_target_inode = in;
3714 mutex_lock(&session->s_mutex);
3716 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
3723 if (rinfo->snapblob_len) {
3724 down_write(&mdsc->snap_rwsem);
3725 err = ceph_update_snap_trace(mdsc, rinfo->snapblob,
3726 rinfo->snapblob + rinfo->snapblob_len,
3727 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
3730 up_write(&mdsc->snap_rwsem);
3731 close_sessions = true;
3736 downgrade_write(&mdsc->snap_rwsem);
3738 down_read(&mdsc->snap_rwsem);
3741 /* insert trace into our cache */
3742 mutex_lock(&req->r_fill_mutex);
3743 current->journal_info = req;
3744 err = ceph_fill_trace(mdsc->fsc->sb, req);
3746 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
3747 req->r_op == CEPH_MDS_OP_LSSNAP))
3748 err = ceph_readdir_prepopulate(req, req->r_session);
3750 current->journal_info = NULL;
3751 mutex_unlock(&req->r_fill_mutex);
3753 up_read(&mdsc->snap_rwsem);
3755 ceph_put_snap_realm(mdsc, realm);
3758 if (req->r_target_inode &&
3759 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
3760 struct ceph_inode_info *ci =
3761 ceph_inode(req->r_target_inode);
3762 spin_lock(&ci->i_unsafe_lock);
3763 list_add_tail(&req->r_unsafe_target_item,
3764 &ci->i_unsafe_iops);
3765 spin_unlock(&ci->i_unsafe_lock);
3768 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
3771 mutex_lock(&mdsc->mutex);
3772 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3776 req->r_reply = ceph_msg_get(msg);
3777 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
3780 dout("reply arrived after request %lld was aborted\n", tid);
3782 mutex_unlock(&mdsc->mutex);
3784 mutex_unlock(&session->s_mutex);
3786 /* kick calling process */
3787 complete_request(mdsc, req);
3789 ceph_update_metadata_metrics(&mdsc->metric, req->r_start_latency,
3790 req->r_end_latency, err);
3792 ceph_mdsc_put_request(req);
3794 /* Defer closing the sessions after s_mutex lock being released */
3796 ceph_mdsc_close_sessions(mdsc);
3803 * handle mds notification that our request has been forwarded.
3805 static void handle_forward(struct ceph_mds_client *mdsc,
3806 struct ceph_mds_session *session,
3807 struct ceph_msg *msg)
3809 struct ceph_mds_request *req;
3810 u64 tid = le64_to_cpu(msg->hdr.tid);
3814 void *p = msg->front.iov_base;
3815 void *end = p + msg->front.iov_len;
3816 bool aborted = false;
3818 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3819 next_mds = ceph_decode_32(&p);
3820 fwd_seq = ceph_decode_32(&p);
3822 mutex_lock(&mdsc->mutex);
3823 req = lookup_get_request(mdsc, tid);
3825 mutex_unlock(&mdsc->mutex);
3826 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3827 return; /* dup reply? */
3830 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3831 dout("forward tid %llu aborted, unregistering\n", tid);
3832 __unregister_request(mdsc, req);
3833 } else if (fwd_seq <= req->r_num_fwd) {
3835 * The type of 'num_fwd' in ceph 'MClientRequestForward'
3836 * is 'int32_t', while in 'ceph_mds_request_head' the
3837 * type is '__u8'. So in case the request bounces between
3838 * MDSes exceeding 256 times, the client will get stuck.
3840 * In this case it's ususally a bug in MDS and continue
3841 * bouncing the request makes no sense.
3843 * In future this could be fixed in ceph code, so avoid
3844 * using the hardcode here.
3846 int max = sizeof_field(struct ceph_mds_request_head, num_fwd);
3847 max = 1 << (max * BITS_PER_BYTE);
3848 if (req->r_num_fwd >= max) {
3849 mutex_lock(&req->r_fill_mutex);
3850 req->r_err = -EMULTIHOP;
3851 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
3852 mutex_unlock(&req->r_fill_mutex);
3854 pr_warn_ratelimited("forward tid %llu seq overflow\n",
3857 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3858 tid, next_mds, req->r_num_fwd, fwd_seq);
3861 /* resend. forward race not possible; mds would drop */
3862 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3864 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3865 req->r_attempts = 0;
3866 req->r_num_fwd = fwd_seq;
3867 req->r_resend_mds = next_mds;
3868 put_request_session(req);
3869 __do_request(mdsc, req);
3871 mutex_unlock(&mdsc->mutex);
3873 /* kick calling process */
3875 complete_request(mdsc, req);
3876 ceph_mdsc_put_request(req);
3880 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3884 static int __decode_session_metadata(void **p, void *end,
3887 /* map<string,string> */
3890 ceph_decode_32_safe(p, end, n, bad);
3893 ceph_decode_32_safe(p, end, len, bad);
3894 ceph_decode_need(p, end, len, bad);
3895 err_str = !strncmp(*p, "error_string", len);
3897 ceph_decode_32_safe(p, end, len, bad);
3898 ceph_decode_need(p, end, len, bad);
3900 * Match "blocklisted (blacklisted)" from newer MDSes,
3901 * or "blacklisted" from older MDSes.
3903 if (err_str && strnstr(*p, "blacklisted", len))
3904 *blocklisted = true;
3913 * handle a mds session control message
3915 static void handle_session(struct ceph_mds_session *session,
3916 struct ceph_msg *msg)
3918 struct ceph_mds_client *mdsc = session->s_mdsc;
3919 int mds = session->s_mds;
3920 int msg_version = le16_to_cpu(msg->hdr.version);
3921 void *p = msg->front.iov_base;
3922 void *end = p + msg->front.iov_len;
3923 struct ceph_mds_session_head *h;
3925 u64 seq, features = 0;
3927 bool blocklisted = false;
3930 ceph_decode_need(&p, end, sizeof(*h), bad);
3934 op = le32_to_cpu(h->op);
3935 seq = le64_to_cpu(h->seq);
3937 if (msg_version >= 3) {
3939 /* version >= 2 and < 5, decode metadata, skip otherwise
3940 * as it's handled via flags.
3942 if (msg_version >= 5)
3943 ceph_decode_skip_map(&p, end, string, string, bad);
3944 else if (__decode_session_metadata(&p, end, &blocklisted) < 0)
3947 /* version >= 3, feature bits */
3948 ceph_decode_32_safe(&p, end, len, bad);
3950 ceph_decode_64_safe(&p, end, features, bad);
3951 p += len - sizeof(features);
3955 if (msg_version >= 5) {
3959 ceph_decode_skip_16(&p, end, bad); /* struct_v, struct_cv */
3960 ceph_decode_32_safe(&p, end, len, bad); /* len */
3961 ceph_decode_skip_n(&p, end, len, bad); /* metric_spec */
3963 /* version >= 5, flags */
3964 ceph_decode_32_safe(&p, end, flags, bad);
3965 if (flags & CEPH_SESSION_BLOCKLISTED) {
3966 pr_warn("mds%d session blocklisted\n", session->s_mds);
3971 mutex_lock(&mdsc->mutex);
3972 if (op == CEPH_SESSION_CLOSE) {
3973 ceph_get_mds_session(session);
3974 __unregister_session(mdsc, session);
3976 /* FIXME: this ttl calculation is generous */
3977 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3978 mutex_unlock(&mdsc->mutex);
3980 mutex_lock(&session->s_mutex);
3982 dout("handle_session mds%d %s %p state %s seq %llu\n",
3983 mds, ceph_session_op_name(op), session,
3984 ceph_session_state_name(session->s_state), seq);
3986 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3987 session->s_state = CEPH_MDS_SESSION_OPEN;
3988 pr_info("mds%d came back\n", session->s_mds);
3992 case CEPH_SESSION_OPEN:
3993 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3994 pr_info("mds%d reconnect success\n", session->s_mds);
3996 if (session->s_state == CEPH_MDS_SESSION_OPEN) {
3997 pr_notice("mds%d is already opened\n", session->s_mds);
3999 session->s_state = CEPH_MDS_SESSION_OPEN;
4000 session->s_features = features;
4001 renewed_caps(mdsc, session, 0);
4002 if (test_bit(CEPHFS_FEATURE_METRIC_COLLECT,
4003 &session->s_features))
4004 metric_schedule_delayed(&mdsc->metric);
4008 * The connection maybe broken and the session in client
4009 * side has been reinitialized, need to update the seq
4012 if (!session->s_seq && seq)
4013 session->s_seq = seq;
4017 __close_session(mdsc, session);
4020 case CEPH_SESSION_RENEWCAPS:
4021 if (session->s_renew_seq == seq)
4022 renewed_caps(mdsc, session, 1);
4025 case CEPH_SESSION_CLOSE:
4026 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
4027 pr_info("mds%d reconnect denied\n", session->s_mds);
4028 session->s_state = CEPH_MDS_SESSION_CLOSED;
4029 cleanup_session_requests(mdsc, session);
4030 remove_session_caps(session);
4031 wake = 2; /* for good measure */
4032 wake_up_all(&mdsc->session_close_wq);
4035 case CEPH_SESSION_STALE:
4036 pr_info("mds%d caps went stale, renewing\n",
4038 atomic_inc(&session->s_cap_gen);
4039 session->s_cap_ttl = jiffies - 1;
4040 send_renew_caps(mdsc, session);
4043 case CEPH_SESSION_RECALL_STATE:
4044 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
4047 case CEPH_SESSION_FLUSHMSG:
4048 /* flush cap releases */
4049 spin_lock(&session->s_cap_lock);
4050 if (session->s_num_cap_releases)
4051 ceph_flush_cap_releases(mdsc, session);
4052 spin_unlock(&session->s_cap_lock);
4054 send_flushmsg_ack(mdsc, session, seq);
4057 case CEPH_SESSION_FORCE_RO:
4058 dout("force_session_readonly %p\n", session);
4059 spin_lock(&session->s_cap_lock);
4060 session->s_readonly = true;
4061 spin_unlock(&session->s_cap_lock);
4062 wake_up_session_caps(session, FORCE_RO);
4065 case CEPH_SESSION_REJECT:
4066 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
4067 pr_info("mds%d rejected session\n", session->s_mds);
4068 session->s_state = CEPH_MDS_SESSION_REJECTED;
4069 cleanup_session_requests(mdsc, session);
4070 remove_session_caps(session);
4072 mdsc->fsc->blocklisted = true;
4073 wake = 2; /* for good measure */
4077 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
4081 mutex_unlock(&session->s_mutex);
4083 mutex_lock(&mdsc->mutex);
4084 __wake_requests(mdsc, &session->s_waiting);
4086 kick_requests(mdsc, mds);
4087 mutex_unlock(&mdsc->mutex);
4089 if (op == CEPH_SESSION_CLOSE)
4090 ceph_put_mds_session(session);
4094 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
4095 (int)msg->front.iov_len);
4100 void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req)
4104 dcaps = xchg(&req->r_dir_caps, 0);
4106 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4107 ceph_put_cap_refs(ceph_inode(req->r_parent), dcaps);
4111 void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req)
4115 dcaps = xchg(&req->r_dir_caps, 0);
4117 dout("releasing r_dir_caps=%s\n", ceph_cap_string(dcaps));
4118 ceph_put_cap_refs_no_check_caps(ceph_inode(req->r_parent),
4124 * called under session->mutex.
4126 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
4127 struct ceph_mds_session *session)
4129 struct ceph_mds_request *req, *nreq;
4132 dout("replay_unsafe_requests mds%d\n", session->s_mds);
4134 mutex_lock(&mdsc->mutex);
4135 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item)
4136 __send_request(session, req, true);
4139 * also re-send old requests when MDS enters reconnect stage. So that MDS
4140 * can process completed request in clientreplay stage.
4142 p = rb_first(&mdsc->request_tree);
4144 req = rb_entry(p, struct ceph_mds_request, r_node);
4146 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
4148 if (req->r_attempts == 0)
4149 continue; /* only old requests */
4150 if (!req->r_session)
4152 if (req->r_session->s_mds != session->s_mds)
4155 ceph_mdsc_release_dir_caps_no_check(req);
4157 __send_request(session, req, true);
4159 mutex_unlock(&mdsc->mutex);
4162 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
4164 struct ceph_msg *reply;
4165 struct ceph_pagelist *_pagelist;
4170 if (!recon_state->allow_multi)
4173 /* can't handle message that contains both caps and realm */
4174 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
4176 /* pre-allocate new pagelist */
4177 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
4181 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4185 /* placeholder for nr_caps */
4186 err = ceph_pagelist_encode_32(_pagelist, 0);
4190 if (recon_state->nr_caps) {
4191 /* currently encoding caps */
4192 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
4196 /* placeholder for nr_realms (currently encoding relams) */
4197 err = ceph_pagelist_encode_32(_pagelist, 0);
4202 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
4206 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
4207 addr = kmap_atomic(page);
4208 if (recon_state->nr_caps) {
4209 /* currently encoding caps */
4210 *addr = cpu_to_le32(recon_state->nr_caps);
4212 /* currently encoding relams */
4213 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
4215 kunmap_atomic(addr);
4217 reply->hdr.version = cpu_to_le16(5);
4218 reply->hdr.compat_version = cpu_to_le16(4);
4220 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
4221 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
4223 ceph_con_send(&recon_state->session->s_con, reply);
4224 ceph_pagelist_release(recon_state->pagelist);
4226 recon_state->pagelist = _pagelist;
4227 recon_state->nr_caps = 0;
4228 recon_state->nr_realms = 0;
4229 recon_state->msg_version = 5;
4232 ceph_msg_put(reply);
4234 ceph_pagelist_release(_pagelist);
4238 static struct dentry* d_find_primary(struct inode *inode)
4240 struct dentry *alias, *dn = NULL;
4242 if (hlist_empty(&inode->i_dentry))
4245 spin_lock(&inode->i_lock);
4246 if (hlist_empty(&inode->i_dentry))
4249 if (S_ISDIR(inode->i_mode)) {
4250 alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
4251 if (!IS_ROOT(alias))
4256 hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
4257 spin_lock(&alias->d_lock);
4258 if (!d_unhashed(alias) &&
4259 (ceph_dentry(alias)->flags & CEPH_DENTRY_PRIMARY_LINK)) {
4260 dn = dget_dlock(alias);
4262 spin_unlock(&alias->d_lock);
4267 spin_unlock(&inode->i_lock);
4272 * Encode information about a cap for a reconnect with the MDS.
4274 static int reconnect_caps_cb(struct inode *inode, int mds, void *arg)
4277 struct ceph_mds_cap_reconnect v2;
4278 struct ceph_mds_cap_reconnect_v1 v1;
4280 struct ceph_inode_info *ci = ceph_inode(inode);
4281 struct ceph_reconnect_state *recon_state = arg;
4282 struct ceph_pagelist *pagelist = recon_state->pagelist;
4283 struct dentry *dentry;
4284 struct ceph_cap *cap;
4286 int pathlen = 0, err;
4290 dentry = d_find_primary(inode);
4292 /* set pathbase to parent dir when msg_version >= 2 */
4293 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase,
4294 recon_state->msg_version >= 2);
4297 err = PTR_ERR(path);
4305 spin_lock(&ci->i_ceph_lock);
4306 cap = __get_cap_for_mds(ci, mds);
4308 spin_unlock(&ci->i_ceph_lock);
4312 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
4313 inode, ceph_vinop(inode), cap, cap->cap_id,
4314 ceph_cap_string(cap->issued));
4316 cap->seq = 0; /* reset cap seq */
4317 cap->issue_seq = 0; /* and issue_seq */
4318 cap->mseq = 0; /* and migrate_seq */
4319 cap->cap_gen = atomic_read(&cap->session->s_cap_gen);
4321 /* These are lost when the session goes away */
4322 if (S_ISDIR(inode->i_mode)) {
4323 if (cap->issued & CEPH_CAP_DIR_CREATE) {
4324 ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
4325 memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
4327 cap->issued &= ~CEPH_CAP_ANY_DIR_OPS;
4330 if (recon_state->msg_version >= 2) {
4331 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
4332 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4333 rec.v2.issued = cpu_to_le32(cap->issued);
4334 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4335 rec.v2.pathbase = cpu_to_le64(pathbase);
4336 rec.v2.flock_len = (__force __le32)
4337 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
4339 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
4340 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
4341 rec.v1.issued = cpu_to_le32(cap->issued);
4342 rec.v1.size = cpu_to_le64(i_size_read(inode));
4343 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
4344 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
4345 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
4346 rec.v1.pathbase = cpu_to_le64(pathbase);
4349 if (list_empty(&ci->i_cap_snaps)) {
4350 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
4352 struct ceph_cap_snap *capsnap =
4353 list_first_entry(&ci->i_cap_snaps,
4354 struct ceph_cap_snap, ci_item);
4355 snap_follows = capsnap->follows;
4357 spin_unlock(&ci->i_ceph_lock);
4359 if (recon_state->msg_version >= 2) {
4360 int num_fcntl_locks, num_flock_locks;
4361 struct ceph_filelock *flocks = NULL;
4362 size_t struct_len, total_len = sizeof(u64);
4366 if (rec.v2.flock_len) {
4367 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
4369 num_fcntl_locks = 0;
4370 num_flock_locks = 0;
4372 if (num_fcntl_locks + num_flock_locks > 0) {
4373 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
4374 sizeof(struct ceph_filelock),
4380 err = ceph_encode_locks_to_buffer(inode, flocks,
4395 if (recon_state->msg_version >= 3) {
4396 /* version, compat_version and struct_len */
4397 total_len += 2 * sizeof(u8) + sizeof(u32);
4401 * number of encoded locks is stable, so copy to pagelist
4403 struct_len = 2 * sizeof(u32) +
4404 (num_fcntl_locks + num_flock_locks) *
4405 sizeof(struct ceph_filelock);
4406 rec.v2.flock_len = cpu_to_le32(struct_len);
4408 struct_len += sizeof(u32) + pathlen + sizeof(rec.v2);
4411 struct_len += sizeof(u64); /* snap_follows */
4413 total_len += struct_len;
4415 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
4416 err = send_reconnect_partial(recon_state);
4418 goto out_freeflocks;
4419 pagelist = recon_state->pagelist;
4422 err = ceph_pagelist_reserve(pagelist, total_len);
4424 goto out_freeflocks;
4426 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4427 if (recon_state->msg_version >= 3) {
4428 ceph_pagelist_encode_8(pagelist, struct_v);
4429 ceph_pagelist_encode_8(pagelist, 1);
4430 ceph_pagelist_encode_32(pagelist, struct_len);
4432 ceph_pagelist_encode_string(pagelist, path, pathlen);
4433 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
4434 ceph_locks_to_pagelist(flocks, pagelist,
4435 num_fcntl_locks, num_flock_locks);
4437 ceph_pagelist_encode_64(pagelist, snap_follows);
4441 err = ceph_pagelist_reserve(pagelist,
4442 sizeof(u64) + sizeof(u32) +
4443 pathlen + sizeof(rec.v1));
4447 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
4448 ceph_pagelist_encode_string(pagelist, path, pathlen);
4449 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
4453 ceph_mdsc_free_path(path, pathlen);
4455 recon_state->nr_caps++;
4459 static int encode_snap_realms(struct ceph_mds_client *mdsc,
4460 struct ceph_reconnect_state *recon_state)
4463 struct ceph_pagelist *pagelist = recon_state->pagelist;
4466 if (recon_state->msg_version >= 4) {
4467 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
4473 * snaprealms. we provide mds with the ino, seq (version), and
4474 * parent for all of our realms. If the mds has any newer info,
4477 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
4478 struct ceph_snap_realm *realm =
4479 rb_entry(p, struct ceph_snap_realm, node);
4480 struct ceph_mds_snaprealm_reconnect sr_rec;
4482 if (recon_state->msg_version >= 4) {
4483 size_t need = sizeof(u8) * 2 + sizeof(u32) +
4486 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
4487 err = send_reconnect_partial(recon_state);
4490 pagelist = recon_state->pagelist;
4493 err = ceph_pagelist_reserve(pagelist, need);
4497 ceph_pagelist_encode_8(pagelist, 1);
4498 ceph_pagelist_encode_8(pagelist, 1);
4499 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
4502 dout(" adding snap realm %llx seq %lld parent %llx\n",
4503 realm->ino, realm->seq, realm->parent_ino);
4504 sr_rec.ino = cpu_to_le64(realm->ino);
4505 sr_rec.seq = cpu_to_le64(realm->seq);
4506 sr_rec.parent = cpu_to_le64(realm->parent_ino);
4508 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
4512 recon_state->nr_realms++;
4520 * If an MDS fails and recovers, clients need to reconnect in order to
4521 * reestablish shared state. This includes all caps issued through
4522 * this session _and_ the snap_realm hierarchy. Because it's not
4523 * clear which snap realms the mds cares about, we send everything we
4524 * know about.. that ensures we'll then get any new info the
4525 * recovering MDS might have.
4527 * This is a relatively heavyweight operation, but it's rare.
4529 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
4530 struct ceph_mds_session *session)
4532 struct ceph_msg *reply;
4533 int mds = session->s_mds;
4535 struct ceph_reconnect_state recon_state = {
4540 pr_info("mds%d reconnect start\n", mds);
4542 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
4543 if (!recon_state.pagelist)
4544 goto fail_nopagelist;
4546 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
4550 xa_destroy(&session->s_delegated_inos);
4552 mutex_lock(&session->s_mutex);
4553 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
4556 dout("session %p state %s\n", session,
4557 ceph_session_state_name(session->s_state));
4559 atomic_inc(&session->s_cap_gen);
4561 spin_lock(&session->s_cap_lock);
4562 /* don't know if session is readonly */
4563 session->s_readonly = 0;
4565 * notify __ceph_remove_cap() that we are composing cap reconnect.
4566 * If a cap get released before being added to the cap reconnect,
4567 * __ceph_remove_cap() should skip queuing cap release.
4569 session->s_cap_reconnect = 1;
4570 /* drop old cap expires; we're about to reestablish that state */
4571 detach_cap_releases(session, &dispose);
4572 spin_unlock(&session->s_cap_lock);
4573 dispose_cap_releases(mdsc, &dispose);
4575 /* trim unused caps to reduce MDS's cache rejoin time */
4576 if (mdsc->fsc->sb->s_root)
4577 shrink_dcache_parent(mdsc->fsc->sb->s_root);
4579 ceph_con_close(&session->s_con);
4580 ceph_con_open(&session->s_con,
4581 CEPH_ENTITY_TYPE_MDS, mds,
4582 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
4584 /* replay unsafe requests */
4585 replay_unsafe_requests(mdsc, session);
4587 ceph_early_kick_flushing_caps(mdsc, session);
4589 down_read(&mdsc->snap_rwsem);
4591 /* placeholder for nr_caps */
4592 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
4596 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
4597 recon_state.msg_version = 3;
4598 recon_state.allow_multi = true;
4599 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
4600 recon_state.msg_version = 3;
4602 recon_state.msg_version = 2;
4604 /* trsaverse this session's caps */
4605 err = ceph_iterate_session_caps(session, reconnect_caps_cb, &recon_state);
4607 spin_lock(&session->s_cap_lock);
4608 session->s_cap_reconnect = 0;
4609 spin_unlock(&session->s_cap_lock);
4614 /* check if all realms can be encoded into current message */
4615 if (mdsc->num_snap_realms) {
4617 recon_state.pagelist->length +
4618 mdsc->num_snap_realms *
4619 sizeof(struct ceph_mds_snaprealm_reconnect);
4620 if (recon_state.msg_version >= 4) {
4621 /* number of realms */
4622 total_len += sizeof(u32);
4623 /* version, compat_version and struct_len */
4624 total_len += mdsc->num_snap_realms *
4625 (2 * sizeof(u8) + sizeof(u32));
4627 if (total_len > RECONNECT_MAX_SIZE) {
4628 if (!recon_state.allow_multi) {
4632 if (recon_state.nr_caps) {
4633 err = send_reconnect_partial(&recon_state);
4637 recon_state.msg_version = 5;
4641 err = encode_snap_realms(mdsc, &recon_state);
4645 if (recon_state.msg_version >= 5) {
4646 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
4651 if (recon_state.nr_caps || recon_state.nr_realms) {
4653 list_first_entry(&recon_state.pagelist->head,
4655 __le32 *addr = kmap_atomic(page);
4656 if (recon_state.nr_caps) {
4657 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
4658 *addr = cpu_to_le32(recon_state.nr_caps);
4659 } else if (recon_state.msg_version >= 4) {
4660 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
4662 kunmap_atomic(addr);
4665 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
4666 if (recon_state.msg_version >= 4)
4667 reply->hdr.compat_version = cpu_to_le16(4);
4669 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
4670 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
4672 ceph_con_send(&session->s_con, reply);
4674 mutex_unlock(&session->s_mutex);
4676 mutex_lock(&mdsc->mutex);
4677 __wake_requests(mdsc, &session->s_waiting);
4678 mutex_unlock(&mdsc->mutex);
4680 up_read(&mdsc->snap_rwsem);
4681 ceph_pagelist_release(recon_state.pagelist);
4685 ceph_msg_put(reply);
4686 up_read(&mdsc->snap_rwsem);
4687 mutex_unlock(&session->s_mutex);
4689 ceph_pagelist_release(recon_state.pagelist);
4691 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
4697 * compare old and new mdsmaps, kicking requests
4698 * and closing out old connections as necessary
4700 * called under mdsc->mutex.
4702 static void check_new_map(struct ceph_mds_client *mdsc,
4703 struct ceph_mdsmap *newmap,
4704 struct ceph_mdsmap *oldmap)
4707 int oldstate, newstate;
4708 struct ceph_mds_session *s;
4709 unsigned long targets[DIV_ROUND_UP(CEPH_MAX_MDS, sizeof(unsigned long))] = {0};
4711 dout("check_new_map new %u old %u\n",
4712 newmap->m_epoch, oldmap->m_epoch);
4714 if (newmap->m_info) {
4715 for (i = 0; i < newmap->possible_max_rank; i++) {
4716 for (j = 0; j < newmap->m_info[i].num_export_targets; j++)
4717 set_bit(newmap->m_info[i].export_targets[j], targets);
4721 for (i = 0; i < oldmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4722 if (!mdsc->sessions[i])
4724 s = mdsc->sessions[i];
4725 oldstate = ceph_mdsmap_get_state(oldmap, i);
4726 newstate = ceph_mdsmap_get_state(newmap, i);
4728 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
4729 i, ceph_mds_state_name(oldstate),
4730 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
4731 ceph_mds_state_name(newstate),
4732 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
4733 ceph_session_state_name(s->s_state));
4735 if (i >= newmap->possible_max_rank) {
4736 /* force close session for stopped mds */
4737 ceph_get_mds_session(s);
4738 __unregister_session(mdsc, s);
4739 __wake_requests(mdsc, &s->s_waiting);
4740 mutex_unlock(&mdsc->mutex);
4742 mutex_lock(&s->s_mutex);
4743 cleanup_session_requests(mdsc, s);
4744 remove_session_caps(s);
4745 mutex_unlock(&s->s_mutex);
4747 ceph_put_mds_session(s);
4749 mutex_lock(&mdsc->mutex);
4750 kick_requests(mdsc, i);
4754 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
4755 ceph_mdsmap_get_addr(newmap, i),
4756 sizeof(struct ceph_entity_addr))) {
4758 mutex_unlock(&mdsc->mutex);
4759 mutex_lock(&s->s_mutex);
4760 mutex_lock(&mdsc->mutex);
4761 ceph_con_close(&s->s_con);
4762 mutex_unlock(&s->s_mutex);
4763 s->s_state = CEPH_MDS_SESSION_RESTARTING;
4764 } else if (oldstate == newstate) {
4765 continue; /* nothing new with this mds */
4771 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
4772 newstate >= CEPH_MDS_STATE_RECONNECT) {
4773 mutex_unlock(&mdsc->mutex);
4774 clear_bit(i, targets);
4775 send_mds_reconnect(mdsc, s);
4776 mutex_lock(&mdsc->mutex);
4780 * kick request on any mds that has gone active.
4782 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
4783 newstate >= CEPH_MDS_STATE_ACTIVE) {
4784 if (oldstate != CEPH_MDS_STATE_CREATING &&
4785 oldstate != CEPH_MDS_STATE_STARTING)
4786 pr_info("mds%d recovery completed\n", s->s_mds);
4787 kick_requests(mdsc, i);
4788 mutex_unlock(&mdsc->mutex);
4789 mutex_lock(&s->s_mutex);
4790 mutex_lock(&mdsc->mutex);
4791 ceph_kick_flushing_caps(mdsc, s);
4792 mutex_unlock(&s->s_mutex);
4793 wake_up_session_caps(s, RECONNECT);
4798 * Only open and reconnect sessions that don't exist yet.
4800 for (i = 0; i < newmap->possible_max_rank; i++) {
4802 * In case the import MDS is crashed just after
4803 * the EImportStart journal is flushed, so when
4804 * a standby MDS takes over it and is replaying
4805 * the EImportStart journal the new MDS daemon
4806 * will wait the client to reconnect it, but the
4807 * client may never register/open the session yet.
4809 * Will try to reconnect that MDS daemon if the
4810 * rank number is in the export targets array and
4811 * is the up:reconnect state.
4813 newstate = ceph_mdsmap_get_state(newmap, i);
4814 if (!test_bit(i, targets) || newstate != CEPH_MDS_STATE_RECONNECT)
4818 * The session maybe registered and opened by some
4819 * requests which were choosing random MDSes during
4820 * the mdsc->mutex's unlock/lock gap below in rare
4821 * case. But the related MDS daemon will just queue
4822 * that requests and be still waiting for the client's
4823 * reconnection request in up:reconnect state.
4825 s = __ceph_lookup_mds_session(mdsc, i);
4827 s = __open_export_target_session(mdsc, i);
4830 pr_err("failed to open export target session, err %d\n",
4835 dout("send reconnect to export target mds.%d\n", i);
4836 mutex_unlock(&mdsc->mutex);
4837 send_mds_reconnect(mdsc, s);
4838 ceph_put_mds_session(s);
4839 mutex_lock(&mdsc->mutex);
4842 for (i = 0; i < newmap->possible_max_rank && i < mdsc->max_sessions; i++) {
4843 s = mdsc->sessions[i];
4846 if (!ceph_mdsmap_is_laggy(newmap, i))
4848 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4849 s->s_state == CEPH_MDS_SESSION_HUNG ||
4850 s->s_state == CEPH_MDS_SESSION_CLOSING) {
4851 dout(" connecting to export targets of laggy mds%d\n",
4853 __open_export_target_sessions(mdsc, s);
4865 * caller must hold session s_mutex, dentry->d_lock
4867 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
4869 struct ceph_dentry_info *di = ceph_dentry(dentry);
4871 ceph_put_mds_session(di->lease_session);
4872 di->lease_session = NULL;
4875 static void handle_lease(struct ceph_mds_client *mdsc,
4876 struct ceph_mds_session *session,
4877 struct ceph_msg *msg)
4879 struct super_block *sb = mdsc->fsc->sb;
4880 struct inode *inode;
4881 struct dentry *parent, *dentry;
4882 struct ceph_dentry_info *di;
4883 int mds = session->s_mds;
4884 struct ceph_mds_lease *h = msg->front.iov_base;
4886 struct ceph_vino vino;
4890 dout("handle_lease from mds%d\n", mds);
4892 if (!ceph_inc_mds_stopping_blocker(mdsc, session))
4896 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
4898 vino.ino = le64_to_cpu(h->ino);
4899 vino.snap = CEPH_NOSNAP;
4900 seq = le32_to_cpu(h->seq);
4901 dname.len = get_unaligned_le32(h + 1);
4902 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
4904 dname.name = (void *)(h + 1) + sizeof(u32);
4907 inode = ceph_find_inode(sb, vino);
4908 dout("handle_lease %s, ino %llx %p %.*s\n",
4909 ceph_lease_op_name(h->action), vino.ino, inode,
4910 dname.len, dname.name);
4912 mutex_lock(&session->s_mutex);
4914 dout("handle_lease no inode %llx\n", vino.ino);
4919 parent = d_find_alias(inode);
4921 dout("no parent dentry on inode %p\n", inode);
4923 goto release; /* hrm... */
4925 dname.hash = full_name_hash(parent, dname.name, dname.len);
4926 dentry = d_lookup(parent, &dname);
4931 spin_lock(&dentry->d_lock);
4932 di = ceph_dentry(dentry);
4933 switch (h->action) {
4934 case CEPH_MDS_LEASE_REVOKE:
4935 if (di->lease_session == session) {
4936 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
4937 h->seq = cpu_to_le32(di->lease_seq);
4938 __ceph_mdsc_drop_dentry_lease(dentry);
4943 case CEPH_MDS_LEASE_RENEW:
4944 if (di->lease_session == session &&
4945 di->lease_gen == atomic_read(&session->s_cap_gen) &&
4946 di->lease_renew_from &&
4947 di->lease_renew_after == 0) {
4948 unsigned long duration =
4949 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
4951 di->lease_seq = seq;
4952 di->time = di->lease_renew_from + duration;
4953 di->lease_renew_after = di->lease_renew_from +
4955 di->lease_renew_from = 0;
4959 spin_unlock(&dentry->d_lock);
4966 /* let's just reuse the same message */
4967 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
4969 ceph_con_send(&session->s_con, msg);
4972 mutex_unlock(&session->s_mutex);
4975 ceph_dec_mds_stopping_blocker(mdsc);
4979 ceph_dec_mds_stopping_blocker(mdsc);
4981 pr_err("corrupt lease message\n");
4985 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
4986 struct dentry *dentry, char action,
4989 struct ceph_msg *msg;
4990 struct ceph_mds_lease *lease;
4992 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
4994 dout("lease_send_msg identry %p %s to mds%d\n",
4995 dentry, ceph_lease_op_name(action), session->s_mds);
4997 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
5000 lease = msg->front.iov_base;
5001 lease->action = action;
5002 lease->seq = cpu_to_le32(seq);
5004 spin_lock(&dentry->d_lock);
5005 dir = d_inode(dentry->d_parent);
5006 lease->ino = cpu_to_le64(ceph_ino(dir));
5007 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
5009 put_unaligned_le32(dentry->d_name.len, lease + 1);
5010 memcpy((void *)(lease + 1) + 4,
5011 dentry->d_name.name, dentry->d_name.len);
5012 spin_unlock(&dentry->d_lock);
5014 ceph_con_send(&session->s_con, msg);
5018 * lock unlock the session, to wait ongoing session activities
5020 static void lock_unlock_session(struct ceph_mds_session *s)
5022 mutex_lock(&s->s_mutex);
5023 mutex_unlock(&s->s_mutex);
5026 static void maybe_recover_session(struct ceph_mds_client *mdsc)
5028 struct ceph_fs_client *fsc = mdsc->fsc;
5030 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
5033 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
5036 if (!READ_ONCE(fsc->blocklisted))
5039 pr_info("auto reconnect after blocklisted\n");
5040 ceph_force_reconnect(fsc->sb);
5043 bool check_session_state(struct ceph_mds_session *s)
5045 switch (s->s_state) {
5046 case CEPH_MDS_SESSION_OPEN:
5047 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
5048 s->s_state = CEPH_MDS_SESSION_HUNG;
5049 pr_info("mds%d hung\n", s->s_mds);
5052 case CEPH_MDS_SESSION_CLOSING:
5053 case CEPH_MDS_SESSION_NEW:
5054 case CEPH_MDS_SESSION_RESTARTING:
5055 case CEPH_MDS_SESSION_CLOSED:
5056 case CEPH_MDS_SESSION_REJECTED:
5064 * If the sequence is incremented while we're waiting on a REQUEST_CLOSE reply,
5065 * then we need to retransmit that request.
5067 void inc_session_sequence(struct ceph_mds_session *s)
5069 lockdep_assert_held(&s->s_mutex);
5073 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
5076 dout("resending session close request for mds%d\n", s->s_mds);
5077 ret = request_close_session(s);
5079 pr_err("unable to close session to mds%d: %d\n",
5085 * delayed work -- periodically trim expired leases, renew caps with mds. If
5086 * the @delay parameter is set to 0 or if it's more than 5 secs, the default
5087 * workqueue delay value of 5 secs will be used.
5089 static void schedule_delayed(struct ceph_mds_client *mdsc, unsigned long delay)
5091 unsigned long max_delay = HZ * 5;
5093 /* 5 secs default delay */
5094 if (!delay || (delay > max_delay))
5096 schedule_delayed_work(&mdsc->delayed_work,
5097 round_jiffies_relative(delay));
5100 static void delayed_work(struct work_struct *work)
5102 struct ceph_mds_client *mdsc =
5103 container_of(work, struct ceph_mds_client, delayed_work.work);
5104 unsigned long delay;
5109 dout("mdsc delayed_work\n");
5111 if (mdsc->stopping >= CEPH_MDSC_STOPPING_FLUSHED)
5114 mutex_lock(&mdsc->mutex);
5115 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
5116 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
5117 mdsc->last_renew_caps);
5119 mdsc->last_renew_caps = jiffies;
5121 for (i = 0; i < mdsc->max_sessions; i++) {
5122 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
5126 if (!check_session_state(s)) {
5127 ceph_put_mds_session(s);
5130 mutex_unlock(&mdsc->mutex);
5132 mutex_lock(&s->s_mutex);
5134 send_renew_caps(mdsc, s);
5136 ceph_con_keepalive(&s->s_con);
5137 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
5138 s->s_state == CEPH_MDS_SESSION_HUNG)
5139 ceph_send_cap_releases(mdsc, s);
5140 mutex_unlock(&s->s_mutex);
5141 ceph_put_mds_session(s);
5143 mutex_lock(&mdsc->mutex);
5145 mutex_unlock(&mdsc->mutex);
5147 delay = ceph_check_delayed_caps(mdsc);
5149 ceph_queue_cap_reclaim_work(mdsc);
5151 ceph_trim_snapid_map(mdsc);
5153 maybe_recover_session(mdsc);
5155 schedule_delayed(mdsc, delay);
5158 int ceph_mdsc_init(struct ceph_fs_client *fsc)
5161 struct ceph_mds_client *mdsc;
5164 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
5168 mutex_init(&mdsc->mutex);
5169 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
5170 if (!mdsc->mdsmap) {
5175 init_completion(&mdsc->safe_umount_waiters);
5176 spin_lock_init(&mdsc->stopping_lock);
5177 atomic_set(&mdsc->stopping_blockers, 0);
5178 init_completion(&mdsc->stopping_waiter);
5179 init_waitqueue_head(&mdsc->session_close_wq);
5180 INIT_LIST_HEAD(&mdsc->waiting_for_map);
5181 mdsc->quotarealms_inodes = RB_ROOT;
5182 mutex_init(&mdsc->quotarealms_inodes_mutex);
5183 init_rwsem(&mdsc->snap_rwsem);
5184 mdsc->snap_realms = RB_ROOT;
5185 INIT_LIST_HEAD(&mdsc->snap_empty);
5186 spin_lock_init(&mdsc->snap_empty_lock);
5187 mdsc->request_tree = RB_ROOT;
5188 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
5189 mdsc->last_renew_caps = jiffies;
5190 INIT_LIST_HEAD(&mdsc->cap_delay_list);
5191 INIT_LIST_HEAD(&mdsc->cap_wait_list);
5192 spin_lock_init(&mdsc->cap_delay_lock);
5193 INIT_LIST_HEAD(&mdsc->snap_flush_list);
5194 spin_lock_init(&mdsc->snap_flush_lock);
5195 mdsc->last_cap_flush_tid = 1;
5196 INIT_LIST_HEAD(&mdsc->cap_flush_list);
5197 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
5198 spin_lock_init(&mdsc->cap_dirty_lock);
5199 init_waitqueue_head(&mdsc->cap_flushing_wq);
5200 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
5201 err = ceph_metric_init(&mdsc->metric);
5205 spin_lock_init(&mdsc->dentry_list_lock);
5206 INIT_LIST_HEAD(&mdsc->dentry_leases);
5207 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
5209 ceph_caps_init(mdsc);
5210 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
5212 spin_lock_init(&mdsc->snapid_map_lock);
5213 mdsc->snapid_map_tree = RB_ROOT;
5214 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
5216 init_rwsem(&mdsc->pool_perm_rwsem);
5217 mdsc->pool_perm_tree = RB_ROOT;
5219 strscpy(mdsc->nodename, utsname()->nodename,
5220 sizeof(mdsc->nodename));
5226 kfree(mdsc->mdsmap);
5233 * Wait for safe replies on open mds requests. If we time out, drop
5234 * all requests from the tree to avoid dangling dentry refs.
5236 static void wait_requests(struct ceph_mds_client *mdsc)
5238 struct ceph_options *opts = mdsc->fsc->client->options;
5239 struct ceph_mds_request *req;
5241 mutex_lock(&mdsc->mutex);
5242 if (__get_oldest_req(mdsc)) {
5243 mutex_unlock(&mdsc->mutex);
5245 dout("wait_requests waiting for requests\n");
5246 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
5247 ceph_timeout_jiffies(opts->mount_timeout));
5249 /* tear down remaining requests */
5250 mutex_lock(&mdsc->mutex);
5251 while ((req = __get_oldest_req(mdsc))) {
5252 dout("wait_requests timed out on tid %llu\n",
5254 list_del_init(&req->r_wait);
5255 __unregister_request(mdsc, req);
5258 mutex_unlock(&mdsc->mutex);
5259 dout("wait_requests done\n");
5262 void send_flush_mdlog(struct ceph_mds_session *s)
5264 struct ceph_msg *msg;
5267 * Pre-luminous MDS crashes when it sees an unknown session request
5269 if (!CEPH_HAVE_FEATURE(s->s_con.peer_features, SERVER_LUMINOUS))
5272 mutex_lock(&s->s_mutex);
5273 dout("request mdlog flush to mds%d (%s)s seq %lld\n", s->s_mds,
5274 ceph_session_state_name(s->s_state), s->s_seq);
5275 msg = ceph_create_session_msg(CEPH_SESSION_REQUEST_FLUSH_MDLOG,
5278 pr_err("failed to request mdlog flush to mds%d (%s) seq %lld\n",
5279 s->s_mds, ceph_session_state_name(s->s_state), s->s_seq);
5281 ceph_con_send(&s->s_con, msg);
5283 mutex_unlock(&s->s_mutex);
5287 * called before mount is ro, and before dentries are torn down.
5288 * (hmm, does this still race with new lookups?)
5290 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
5292 dout("pre_umount\n");
5293 mdsc->stopping = CEPH_MDSC_STOPPING_BEGIN;
5295 ceph_mdsc_iterate_sessions(mdsc, send_flush_mdlog, true);
5296 ceph_mdsc_iterate_sessions(mdsc, lock_unlock_session, false);
5297 ceph_flush_dirty_caps(mdsc);
5298 wait_requests(mdsc);
5301 * wait for reply handlers to drop their request refs and
5302 * their inode/dcache refs
5306 ceph_cleanup_quotarealms_inodes(mdsc);
5310 * flush the mdlog and wait for all write mds requests to flush.
5312 static void flush_mdlog_and_wait_mdsc_unsafe_requests(struct ceph_mds_client *mdsc,
5315 struct ceph_mds_request *req = NULL, *nextreq;
5316 struct ceph_mds_session *last_session = NULL;
5319 mutex_lock(&mdsc->mutex);
5320 dout("%s want %lld\n", __func__, want_tid);
5322 req = __get_oldest_req(mdsc);
5323 while (req && req->r_tid <= want_tid) {
5324 /* find next request */
5325 n = rb_next(&req->r_node);
5327 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
5330 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
5331 (req->r_op & CEPH_MDS_OP_WRITE)) {
5332 struct ceph_mds_session *s = req->r_session;
5340 ceph_mdsc_get_request(req);
5342 ceph_mdsc_get_request(nextreq);
5343 s = ceph_get_mds_session(s);
5344 mutex_unlock(&mdsc->mutex);
5346 /* send flush mdlog request to MDS */
5347 if (last_session != s) {
5348 send_flush_mdlog(s);
5349 ceph_put_mds_session(last_session);
5352 ceph_put_mds_session(s);
5354 dout("%s wait on %llu (want %llu)\n", __func__,
5355 req->r_tid, want_tid);
5356 wait_for_completion(&req->r_safe_completion);
5358 mutex_lock(&mdsc->mutex);
5359 ceph_mdsc_put_request(req);
5361 break; /* next dne before, so we're done! */
5362 if (RB_EMPTY_NODE(&nextreq->r_node)) {
5363 /* next request was removed from tree */
5364 ceph_mdsc_put_request(nextreq);
5367 ceph_mdsc_put_request(nextreq); /* won't go away */
5371 mutex_unlock(&mdsc->mutex);
5372 ceph_put_mds_session(last_session);
5373 dout("%s done\n", __func__);
5376 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
5378 u64 want_tid, want_flush;
5380 if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN)
5384 mutex_lock(&mdsc->mutex);
5385 want_tid = mdsc->last_tid;
5386 mutex_unlock(&mdsc->mutex);
5388 ceph_flush_dirty_caps(mdsc);
5389 spin_lock(&mdsc->cap_dirty_lock);
5390 want_flush = mdsc->last_cap_flush_tid;
5391 if (!list_empty(&mdsc->cap_flush_list)) {
5392 struct ceph_cap_flush *cf =
5393 list_last_entry(&mdsc->cap_flush_list,
5394 struct ceph_cap_flush, g_list);
5397 spin_unlock(&mdsc->cap_dirty_lock);
5399 dout("sync want tid %lld flush_seq %lld\n",
5400 want_tid, want_flush);
5402 flush_mdlog_and_wait_mdsc_unsafe_requests(mdsc, want_tid);
5403 wait_caps_flush(mdsc, want_flush);
5407 * true if all sessions are closed, or we force unmount
5409 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
5411 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
5413 return atomic_read(&mdsc->num_sessions) <= skipped;
5417 * called after sb is ro or when metadata corrupted.
5419 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
5421 struct ceph_options *opts = mdsc->fsc->client->options;
5422 struct ceph_mds_session *session;
5426 dout("close_sessions\n");
5428 /* close sessions */
5429 mutex_lock(&mdsc->mutex);
5430 for (i = 0; i < mdsc->max_sessions; i++) {
5431 session = __ceph_lookup_mds_session(mdsc, i);
5434 mutex_unlock(&mdsc->mutex);
5435 mutex_lock(&session->s_mutex);
5436 if (__close_session(mdsc, session) <= 0)
5438 mutex_unlock(&session->s_mutex);
5439 ceph_put_mds_session(session);
5440 mutex_lock(&mdsc->mutex);
5442 mutex_unlock(&mdsc->mutex);
5444 dout("waiting for sessions to close\n");
5445 wait_event_timeout(mdsc->session_close_wq,
5446 done_closing_sessions(mdsc, skipped),
5447 ceph_timeout_jiffies(opts->mount_timeout));
5449 /* tear down remaining sessions */
5450 mutex_lock(&mdsc->mutex);
5451 for (i = 0; i < mdsc->max_sessions; i++) {
5452 if (mdsc->sessions[i]) {
5453 session = ceph_get_mds_session(mdsc->sessions[i]);
5454 __unregister_session(mdsc, session);
5455 mutex_unlock(&mdsc->mutex);
5456 mutex_lock(&session->s_mutex);
5457 remove_session_caps(session);
5458 mutex_unlock(&session->s_mutex);
5459 ceph_put_mds_session(session);
5460 mutex_lock(&mdsc->mutex);
5463 WARN_ON(!list_empty(&mdsc->cap_delay_list));
5464 mutex_unlock(&mdsc->mutex);
5466 ceph_cleanup_snapid_map(mdsc);
5467 ceph_cleanup_global_and_empty_realms(mdsc);
5469 cancel_work_sync(&mdsc->cap_reclaim_work);
5470 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
5475 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
5477 struct ceph_mds_session *session;
5480 dout("force umount\n");
5482 mutex_lock(&mdsc->mutex);
5483 for (mds = 0; mds < mdsc->max_sessions; mds++) {
5484 session = __ceph_lookup_mds_session(mdsc, mds);
5488 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
5489 __unregister_session(mdsc, session);
5490 __wake_requests(mdsc, &session->s_waiting);
5491 mutex_unlock(&mdsc->mutex);
5493 mutex_lock(&session->s_mutex);
5494 __close_session(mdsc, session);
5495 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
5496 cleanup_session_requests(mdsc, session);
5497 remove_session_caps(session);
5499 mutex_unlock(&session->s_mutex);
5500 ceph_put_mds_session(session);
5502 mutex_lock(&mdsc->mutex);
5503 kick_requests(mdsc, mds);
5505 __wake_requests(mdsc, &mdsc->waiting_for_map);
5506 mutex_unlock(&mdsc->mutex);
5509 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
5513 * Make sure the delayed work stopped before releasing
5516 * Because the cancel_delayed_work_sync() will only
5517 * guarantee that the work finishes executing. But the
5518 * delayed work will re-arm itself again after that.
5520 flush_delayed_work(&mdsc->delayed_work);
5523 ceph_mdsmap_destroy(mdsc->mdsmap);
5524 kfree(mdsc->sessions);
5525 ceph_caps_finalize(mdsc);
5526 ceph_pool_perm_destroy(mdsc);
5529 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
5531 struct ceph_mds_client *mdsc = fsc->mdsc;
5532 dout("mdsc_destroy %p\n", mdsc);
5537 /* flush out any connection work with references to us */
5540 ceph_mdsc_stop(mdsc);
5542 ceph_metric_destroy(&mdsc->metric);
5546 dout("mdsc_destroy %p done\n", mdsc);
5549 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5551 struct ceph_fs_client *fsc = mdsc->fsc;
5552 const char *mds_namespace = fsc->mount_options->mds_namespace;
5553 void *p = msg->front.iov_base;
5554 void *end = p + msg->front.iov_len;
5557 u32 mount_fscid = (u32)-1;
5560 ceph_decode_need(&p, end, sizeof(u32), bad);
5561 epoch = ceph_decode_32(&p);
5563 dout("handle_fsmap epoch %u\n", epoch);
5565 /* struct_v, struct_cv, map_len, epoch, legacy_client_fscid */
5566 ceph_decode_skip_n(&p, end, 2 + sizeof(u32) * 3, bad);
5568 ceph_decode_32_safe(&p, end, num_fs, bad);
5569 while (num_fs-- > 0) {
5570 void *info_p, *info_end;
5574 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
5575 p += 2; // info_v, info_cv
5576 info_len = ceph_decode_32(&p);
5577 ceph_decode_need(&p, end, info_len, bad);
5579 info_end = p + info_len;
5582 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
5583 fscid = ceph_decode_32(&info_p);
5584 namelen = ceph_decode_32(&info_p);
5585 ceph_decode_need(&info_p, info_end, namelen, bad);
5587 if (mds_namespace &&
5588 strlen(mds_namespace) == namelen &&
5589 !strncmp(mds_namespace, (char *)info_p, namelen)) {
5590 mount_fscid = fscid;
5595 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
5596 if (mount_fscid != (u32)-1) {
5597 fsc->client->monc.fs_cluster_id = mount_fscid;
5598 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
5600 ceph_monc_renew_subs(&fsc->client->monc);
5608 pr_err("error decoding fsmap %d. Shutting down mount.\n", err);
5609 ceph_umount_begin(mdsc->fsc->sb);
5612 mutex_lock(&mdsc->mutex);
5613 mdsc->mdsmap_err = err;
5614 __wake_requests(mdsc, &mdsc->waiting_for_map);
5615 mutex_unlock(&mdsc->mutex);
5619 * handle mds map update.
5621 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
5625 void *p = msg->front.iov_base;
5626 void *end = p + msg->front.iov_len;
5627 struct ceph_mdsmap *newmap, *oldmap;
5628 struct ceph_fsid fsid;
5631 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
5632 ceph_decode_copy(&p, &fsid, sizeof(fsid));
5633 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
5635 epoch = ceph_decode_32(&p);
5636 maplen = ceph_decode_32(&p);
5637 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
5639 /* do we need it? */
5640 mutex_lock(&mdsc->mutex);
5641 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
5642 dout("handle_map epoch %u <= our %u\n",
5643 epoch, mdsc->mdsmap->m_epoch);
5644 mutex_unlock(&mdsc->mutex);
5648 newmap = ceph_mdsmap_decode(&p, end, ceph_msgr2(mdsc->fsc->client));
5649 if (IS_ERR(newmap)) {
5650 err = PTR_ERR(newmap);
5654 /* swap into place */
5656 oldmap = mdsc->mdsmap;
5657 mdsc->mdsmap = newmap;
5658 check_new_map(mdsc, newmap, oldmap);
5659 ceph_mdsmap_destroy(oldmap);
5661 mdsc->mdsmap = newmap; /* first mds map */
5663 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
5666 __wake_requests(mdsc, &mdsc->waiting_for_map);
5667 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
5668 mdsc->mdsmap->m_epoch);
5670 mutex_unlock(&mdsc->mutex);
5671 schedule_delayed(mdsc, 0);
5675 mutex_unlock(&mdsc->mutex);
5677 pr_err("error decoding mdsmap %d. Shutting down mount.\n", err);
5678 ceph_umount_begin(mdsc->fsc->sb);
5683 static struct ceph_connection *mds_get_con(struct ceph_connection *con)
5685 struct ceph_mds_session *s = con->private;
5687 if (ceph_get_mds_session(s))
5692 static void mds_put_con(struct ceph_connection *con)
5694 struct ceph_mds_session *s = con->private;
5696 ceph_put_mds_session(s);
5700 * if the client is unresponsive for long enough, the mds will kill
5701 * the session entirely.
5703 static void mds_peer_reset(struct ceph_connection *con)
5705 struct ceph_mds_session *s = con->private;
5706 struct ceph_mds_client *mdsc = s->s_mdsc;
5708 pr_warn("mds%d closed our session\n", s->s_mds);
5709 if (READ_ONCE(mdsc->fsc->mount_state) != CEPH_MOUNT_FENCE_IO)
5710 send_mds_reconnect(mdsc, s);
5713 static void mds_dispatch(struct ceph_connection *con, struct ceph_msg *msg)
5715 struct ceph_mds_session *s = con->private;
5716 struct ceph_mds_client *mdsc = s->s_mdsc;
5717 int type = le16_to_cpu(msg->hdr.type);
5719 mutex_lock(&mdsc->mutex);
5720 if (__verify_registered_session(mdsc, s) < 0) {
5721 mutex_unlock(&mdsc->mutex);
5724 mutex_unlock(&mdsc->mutex);
5727 case CEPH_MSG_MDS_MAP:
5728 ceph_mdsc_handle_mdsmap(mdsc, msg);
5730 case CEPH_MSG_FS_MAP_USER:
5731 ceph_mdsc_handle_fsmap(mdsc, msg);
5733 case CEPH_MSG_CLIENT_SESSION:
5734 handle_session(s, msg);
5736 case CEPH_MSG_CLIENT_REPLY:
5737 handle_reply(s, msg);
5739 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
5740 handle_forward(mdsc, s, msg);
5742 case CEPH_MSG_CLIENT_CAPS:
5743 ceph_handle_caps(s, msg);
5745 case CEPH_MSG_CLIENT_SNAP:
5746 ceph_handle_snap(mdsc, s, msg);
5748 case CEPH_MSG_CLIENT_LEASE:
5749 handle_lease(mdsc, s, msg);
5751 case CEPH_MSG_CLIENT_QUOTA:
5752 ceph_handle_quota(mdsc, s, msg);
5756 pr_err("received unknown message type %d %s\n", type,
5757 ceph_msg_type_name(type));
5768 * Note: returned pointer is the address of a structure that's
5769 * managed separately. Caller must *not* attempt to free it.
5771 static struct ceph_auth_handshake *
5772 mds_get_authorizer(struct ceph_connection *con, int *proto, int force_new)
5774 struct ceph_mds_session *s = con->private;
5775 struct ceph_mds_client *mdsc = s->s_mdsc;
5776 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5777 struct ceph_auth_handshake *auth = &s->s_auth;
5780 ret = __ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5781 force_new, proto, NULL, NULL);
5783 return ERR_PTR(ret);
5788 static int mds_add_authorizer_challenge(struct ceph_connection *con,
5789 void *challenge_buf, int challenge_buf_len)
5791 struct ceph_mds_session *s = con->private;
5792 struct ceph_mds_client *mdsc = s->s_mdsc;
5793 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5795 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
5796 challenge_buf, challenge_buf_len);
5799 static int mds_verify_authorizer_reply(struct ceph_connection *con)
5801 struct ceph_mds_session *s = con->private;
5802 struct ceph_mds_client *mdsc = s->s_mdsc;
5803 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5804 struct ceph_auth_handshake *auth = &s->s_auth;
5806 return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
5807 auth->authorizer_reply_buf, auth->authorizer_reply_buf_len,
5808 NULL, NULL, NULL, NULL);
5811 static int mds_invalidate_authorizer(struct ceph_connection *con)
5813 struct ceph_mds_session *s = con->private;
5814 struct ceph_mds_client *mdsc = s->s_mdsc;
5815 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
5817 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
5819 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
5822 static int mds_get_auth_request(struct ceph_connection *con,
5823 void *buf, int *buf_len,
5824 void **authorizer, int *authorizer_len)
5826 struct ceph_mds_session *s = con->private;
5827 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5828 struct ceph_auth_handshake *auth = &s->s_auth;
5831 ret = ceph_auth_get_authorizer(ac, auth, CEPH_ENTITY_TYPE_MDS,
5836 *authorizer = auth->authorizer_buf;
5837 *authorizer_len = auth->authorizer_buf_len;
5841 static int mds_handle_auth_reply_more(struct ceph_connection *con,
5842 void *reply, int reply_len,
5843 void *buf, int *buf_len,
5844 void **authorizer, int *authorizer_len)
5846 struct ceph_mds_session *s = con->private;
5847 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5848 struct ceph_auth_handshake *auth = &s->s_auth;
5851 ret = ceph_auth_handle_svc_reply_more(ac, auth, reply, reply_len,
5856 *authorizer = auth->authorizer_buf;
5857 *authorizer_len = auth->authorizer_buf_len;
5861 static int mds_handle_auth_done(struct ceph_connection *con,
5862 u64 global_id, void *reply, int reply_len,
5863 u8 *session_key, int *session_key_len,
5864 u8 *con_secret, int *con_secret_len)
5866 struct ceph_mds_session *s = con->private;
5867 struct ceph_auth_client *ac = s->s_mdsc->fsc->client->monc.auth;
5868 struct ceph_auth_handshake *auth = &s->s_auth;
5870 return ceph_auth_handle_svc_reply_done(ac, auth, reply, reply_len,
5871 session_key, session_key_len,
5872 con_secret, con_secret_len);
5875 static int mds_handle_auth_bad_method(struct ceph_connection *con,
5876 int used_proto, int result,
5877 const int *allowed_protos, int proto_cnt,
5878 const int *allowed_modes, int mode_cnt)
5880 struct ceph_mds_session *s = con->private;
5881 struct ceph_mon_client *monc = &s->s_mdsc->fsc->client->monc;
5884 if (ceph_auth_handle_bad_authorizer(monc->auth, CEPH_ENTITY_TYPE_MDS,
5886 allowed_protos, proto_cnt,
5887 allowed_modes, mode_cnt)) {
5888 ret = ceph_monc_validate_auth(monc);
5896 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
5897 struct ceph_msg_header *hdr, int *skip)
5899 struct ceph_msg *msg;
5900 int type = (int) le16_to_cpu(hdr->type);
5901 int front_len = (int) le32_to_cpu(hdr->front_len);
5907 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
5909 pr_err("unable to allocate msg type %d len %d\n",
5917 static int mds_sign_message(struct ceph_msg *msg)
5919 struct ceph_mds_session *s = msg->con->private;
5920 struct ceph_auth_handshake *auth = &s->s_auth;
5922 return ceph_auth_sign_message(auth, msg);
5925 static int mds_check_message_signature(struct ceph_msg *msg)
5927 struct ceph_mds_session *s = msg->con->private;
5928 struct ceph_auth_handshake *auth = &s->s_auth;
5930 return ceph_auth_check_message_signature(auth, msg);
5933 static const struct ceph_connection_operations mds_con_ops = {
5936 .alloc_msg = mds_alloc_msg,
5937 .dispatch = mds_dispatch,
5938 .peer_reset = mds_peer_reset,
5939 .get_authorizer = mds_get_authorizer,
5940 .add_authorizer_challenge = mds_add_authorizer_challenge,
5941 .verify_authorizer_reply = mds_verify_authorizer_reply,
5942 .invalidate_authorizer = mds_invalidate_authorizer,
5943 .sign_message = mds_sign_message,
5944 .check_message_signature = mds_check_message_signature,
5945 .get_auth_request = mds_get_auth_request,
5946 .handle_auth_reply_more = mds_handle_auth_reply_more,
5947 .handle_auth_done = mds_handle_auth_done,
5948 .handle_auth_bad_method = mds_handle_auth_bad_method,