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>
14 #include "mds_client.h"
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
23 #define RECONNECT_MAX_SIZE (INT_MAX - PAGE_SIZE)
26 * A cluster of MDS (metadata server) daemons is responsible for
27 * managing the file system namespace (the directory hierarchy and
28 * inodes) and for coordinating shared access to storage. Metadata is
29 * partitioning hierarchically across a number of servers, and that
30 * partition varies over time as the cluster adjusts the distribution
31 * in order to balance load.
33 * The MDS client is primarily responsible to managing synchronous
34 * metadata requests for operations like open, unlink, and so forth.
35 * If there is a MDS failure, we find out about it when we (possibly
36 * request and) receive a new MDS map, and can resubmit affected
39 * For the most part, though, we take advantage of a lossless
40 * communications channel to the MDS, and do not need to worry about
41 * timing out or resubmitting requests.
43 * We maintain a stateful "session" with each MDS we interact with.
44 * Within each session, we sent periodic heartbeat messages to ensure
45 * any capabilities or leases we have been issues remain valid. If
46 * the session times out and goes stale, our leases and capabilities
47 * are no longer valid.
50 struct ceph_reconnect_state {
51 struct ceph_mds_session *session;
52 int nr_caps, nr_realms;
53 struct ceph_pagelist *pagelist;
58 static void __wake_requests(struct ceph_mds_client *mdsc,
59 struct list_head *head);
60 static void ceph_cap_release_work(struct work_struct *work);
61 static void ceph_cap_reclaim_work(struct work_struct *work);
63 static const struct ceph_connection_operations mds_con_ops;
70 static int parse_reply_info_quota(void **p, void *end,
71 struct ceph_mds_reply_info_in *info)
73 u8 struct_v, struct_compat;
76 ceph_decode_8_safe(p, end, struct_v, bad);
77 ceph_decode_8_safe(p, end, struct_compat, bad);
78 /* struct_v is expected to be >= 1. we only
79 * understand encoding with struct_compat == 1. */
80 if (!struct_v || struct_compat != 1)
82 ceph_decode_32_safe(p, end, struct_len, bad);
83 ceph_decode_need(p, end, struct_len, bad);
84 end = *p + struct_len;
85 ceph_decode_64_safe(p, end, info->max_bytes, bad);
86 ceph_decode_64_safe(p, end, info->max_files, bad);
94 * parse individual inode info
96 static int parse_reply_info_in(void **p, void *end,
97 struct ceph_mds_reply_info_in *info,
103 if (features == (u64)-1) {
106 ceph_decode_8_safe(p, end, struct_v, bad);
107 ceph_decode_8_safe(p, end, struct_compat, bad);
108 /* struct_v is expected to be >= 1. we only understand
109 * encoding with struct_compat == 1. */
110 if (!struct_v || struct_compat != 1)
112 ceph_decode_32_safe(p, end, struct_len, bad);
113 ceph_decode_need(p, end, struct_len, bad);
114 end = *p + struct_len;
117 ceph_decode_need(p, end, sizeof(struct ceph_mds_reply_inode), bad);
119 *p += sizeof(struct ceph_mds_reply_inode) +
120 sizeof(*info->in->fragtree.splits) *
121 le32_to_cpu(info->in->fragtree.nsplits);
123 ceph_decode_32_safe(p, end, info->symlink_len, bad);
124 ceph_decode_need(p, end, info->symlink_len, bad);
126 *p += info->symlink_len;
128 ceph_decode_copy_safe(p, end, &info->dir_layout,
129 sizeof(info->dir_layout), bad);
130 ceph_decode_32_safe(p, end, info->xattr_len, bad);
131 ceph_decode_need(p, end, info->xattr_len, bad);
132 info->xattr_data = *p;
133 *p += info->xattr_len;
135 if (features == (u64)-1) {
137 ceph_decode_64_safe(p, end, info->inline_version, bad);
138 ceph_decode_32_safe(p, end, info->inline_len, bad);
139 ceph_decode_need(p, end, info->inline_len, bad);
140 info->inline_data = *p;
141 *p += info->inline_len;
143 err = parse_reply_info_quota(p, end, info);
147 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
148 if (info->pool_ns_len > 0) {
149 ceph_decode_need(p, end, info->pool_ns_len, bad);
150 info->pool_ns_data = *p;
151 *p += info->pool_ns_len;
155 ceph_decode_need(p, end, sizeof(info->btime), bad);
156 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
158 /* change attribute */
159 ceph_decode_64_safe(p, end, info->change_attr, bad);
163 ceph_decode_32_safe(p, end, info->dir_pin, bad);
165 info->dir_pin = -ENODATA;
168 /* snapshot birth time, remains zero for v<=2 */
170 ceph_decode_need(p, end, sizeof(info->snap_btime), bad);
171 ceph_decode_copy(p, &info->snap_btime,
172 sizeof(info->snap_btime));
174 memset(&info->snap_btime, 0, sizeof(info->snap_btime));
179 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
180 ceph_decode_64_safe(p, end, info->inline_version, bad);
181 ceph_decode_32_safe(p, end, info->inline_len, bad);
182 ceph_decode_need(p, end, info->inline_len, bad);
183 info->inline_data = *p;
184 *p += info->inline_len;
186 info->inline_version = CEPH_INLINE_NONE;
188 if (features & CEPH_FEATURE_MDS_QUOTA) {
189 err = parse_reply_info_quota(p, end, info);
197 info->pool_ns_len = 0;
198 info->pool_ns_data = NULL;
199 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
200 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
201 if (info->pool_ns_len > 0) {
202 ceph_decode_need(p, end, info->pool_ns_len, bad);
203 info->pool_ns_data = *p;
204 *p += info->pool_ns_len;
208 if (features & CEPH_FEATURE_FS_BTIME) {
209 ceph_decode_need(p, end, sizeof(info->btime), bad);
210 ceph_decode_copy(p, &info->btime, sizeof(info->btime));
211 ceph_decode_64_safe(p, end, info->change_attr, bad);
214 info->dir_pin = -ENODATA;
215 /* info->snap_btime remains zero */
224 static int parse_reply_info_dir(void **p, void *end,
225 struct ceph_mds_reply_dirfrag **dirfrag,
228 if (features == (u64)-1) {
229 u8 struct_v, struct_compat;
231 ceph_decode_8_safe(p, end, struct_v, bad);
232 ceph_decode_8_safe(p, end, struct_compat, bad);
233 /* struct_v is expected to be >= 1. we only understand
234 * encoding whose struct_compat == 1. */
235 if (!struct_v || struct_compat != 1)
237 ceph_decode_32_safe(p, end, struct_len, bad);
238 ceph_decode_need(p, end, struct_len, bad);
239 end = *p + struct_len;
242 ceph_decode_need(p, end, sizeof(**dirfrag), bad);
244 *p += sizeof(**dirfrag) + sizeof(u32) * le32_to_cpu((*dirfrag)->ndist);
245 if (unlikely(*p > end))
247 if (features == (u64)-1)
254 static int parse_reply_info_lease(void **p, void *end,
255 struct ceph_mds_reply_lease **lease,
258 if (features == (u64)-1) {
259 u8 struct_v, struct_compat;
261 ceph_decode_8_safe(p, end, struct_v, bad);
262 ceph_decode_8_safe(p, end, struct_compat, bad);
263 /* struct_v is expected to be >= 1. we only understand
264 * encoding whose struct_compat == 1. */
265 if (!struct_v || struct_compat != 1)
267 ceph_decode_32_safe(p, end, struct_len, bad);
268 ceph_decode_need(p, end, struct_len, bad);
269 end = *p + struct_len;
272 ceph_decode_need(p, end, sizeof(**lease), bad);
274 *p += sizeof(**lease);
275 if (features == (u64)-1)
283 * parse a normal reply, which may contain a (dir+)dentry and/or a
286 static int parse_reply_info_trace(void **p, void *end,
287 struct ceph_mds_reply_info_parsed *info,
292 if (info->head->is_dentry) {
293 err = parse_reply_info_in(p, end, &info->diri, features);
297 err = parse_reply_info_dir(p, end, &info->dirfrag, features);
301 ceph_decode_32_safe(p, end, info->dname_len, bad);
302 ceph_decode_need(p, end, info->dname_len, bad);
304 *p += info->dname_len;
306 err = parse_reply_info_lease(p, end, &info->dlease, features);
311 if (info->head->is_target) {
312 err = parse_reply_info_in(p, end, &info->targeti, features);
317 if (unlikely(*p != end))
324 pr_err("problem parsing mds trace %d\n", err);
329 * parse readdir results
331 static int parse_reply_info_readdir(void **p, void *end,
332 struct ceph_mds_reply_info_parsed *info,
338 err = parse_reply_info_dir(p, end, &info->dir_dir, features);
342 ceph_decode_need(p, end, sizeof(num) + 2, bad);
343 num = ceph_decode_32(p);
345 u16 flags = ceph_decode_16(p);
346 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
347 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
348 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
349 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
354 BUG_ON(!info->dir_entries);
355 if ((unsigned long)(info->dir_entries + num) >
356 (unsigned long)info->dir_entries + info->dir_buf_size) {
357 pr_err("dir contents are larger than expected\n");
364 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
366 ceph_decode_32_safe(p, end, rde->name_len, bad);
367 ceph_decode_need(p, end, rde->name_len, bad);
370 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
373 err = parse_reply_info_lease(p, end, &rde->lease, features);
377 err = parse_reply_info_in(p, end, &rde->inode, features);
380 /* ceph_readdir_prepopulate() will update it */
387 /* Skip over any unrecognized fields */
394 pr_err("problem parsing dir contents %d\n", err);
399 * parse fcntl F_GETLK results
401 static int parse_reply_info_filelock(void **p, void *end,
402 struct ceph_mds_reply_info_parsed *info,
405 if (*p + sizeof(*info->filelock_reply) > end)
408 info->filelock_reply = *p;
410 /* Skip over any unrecognized fields */
418 * parse create results
420 static int parse_reply_info_create(void **p, void *end,
421 struct ceph_mds_reply_info_parsed *info,
424 if (features == (u64)-1 ||
425 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
426 /* Malformed reply? */
428 info->has_create_ino = false;
430 info->has_create_ino = true;
431 ceph_decode_64_safe(p, end, info->ino, bad);
438 /* Skip over any unrecognized fields */
446 * parse extra results
448 static int parse_reply_info_extra(void **p, void *end,
449 struct ceph_mds_reply_info_parsed *info,
452 u32 op = le32_to_cpu(info->head->op);
454 if (op == CEPH_MDS_OP_GETFILELOCK)
455 return parse_reply_info_filelock(p, end, info, features);
456 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
457 return parse_reply_info_readdir(p, end, info, features);
458 else if (op == CEPH_MDS_OP_CREATE)
459 return parse_reply_info_create(p, end, info, features);
465 * parse entire mds reply
467 static int parse_reply_info(struct ceph_msg *msg,
468 struct ceph_mds_reply_info_parsed *info,
475 info->head = msg->front.iov_base;
476 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
477 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
480 ceph_decode_32_safe(&p, end, len, bad);
482 ceph_decode_need(&p, end, len, bad);
483 err = parse_reply_info_trace(&p, p+len, info, features);
489 ceph_decode_32_safe(&p, end, len, bad);
491 ceph_decode_need(&p, end, len, bad);
492 err = parse_reply_info_extra(&p, p+len, info, features);
498 ceph_decode_32_safe(&p, end, len, bad);
499 info->snapblob_len = len;
510 pr_err("mds parse_reply err %d\n", err);
514 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
516 if (!info->dir_entries)
518 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
525 const char *ceph_session_state_name(int s)
528 case CEPH_MDS_SESSION_NEW: return "new";
529 case CEPH_MDS_SESSION_OPENING: return "opening";
530 case CEPH_MDS_SESSION_OPEN: return "open";
531 case CEPH_MDS_SESSION_HUNG: return "hung";
532 case CEPH_MDS_SESSION_CLOSING: return "closing";
533 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
534 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
535 case CEPH_MDS_SESSION_REJECTED: return "rejected";
536 default: return "???";
540 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
542 if (refcount_inc_not_zero(&s->s_ref)) {
543 dout("mdsc get_session %p %d -> %d\n", s,
544 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
547 dout("mdsc get_session %p 0 -- FAIL\n", s);
552 void ceph_put_mds_session(struct ceph_mds_session *s)
554 dout("mdsc put_session %p %d -> %d\n", s,
555 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
556 if (refcount_dec_and_test(&s->s_ref)) {
557 if (s->s_auth.authorizer)
558 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
564 * called under mdsc->mutex
566 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
569 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
571 return get_session(mdsc->sessions[mds]);
574 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
576 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
582 static int __verify_registered_session(struct ceph_mds_client *mdsc,
583 struct ceph_mds_session *s)
585 if (s->s_mds >= mdsc->max_sessions ||
586 mdsc->sessions[s->s_mds] != s)
592 * create+register a new session for given mds.
593 * called under mdsc->mutex.
595 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
598 struct ceph_mds_session *s;
600 if (mds >= mdsc->mdsmap->m_num_mds)
601 return ERR_PTR(-EINVAL);
603 s = kzalloc(sizeof(*s), GFP_NOFS);
605 return ERR_PTR(-ENOMEM);
607 if (mds >= mdsc->max_sessions) {
608 int newmax = 1 << get_count_order(mds + 1);
609 struct ceph_mds_session **sa;
611 dout("%s: realloc to %d\n", __func__, newmax);
612 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
615 if (mdsc->sessions) {
616 memcpy(sa, mdsc->sessions,
617 mdsc->max_sessions * sizeof(void *));
618 kfree(mdsc->sessions);
621 mdsc->max_sessions = newmax;
624 dout("%s: mds%d\n", __func__, mds);
627 s->s_state = CEPH_MDS_SESSION_NEW;
630 mutex_init(&s->s_mutex);
632 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
634 spin_lock_init(&s->s_gen_ttl_lock);
636 s->s_cap_ttl = jiffies - 1;
638 spin_lock_init(&s->s_cap_lock);
639 s->s_renew_requested = 0;
641 INIT_LIST_HEAD(&s->s_caps);
643 refcount_set(&s->s_ref, 1);
644 INIT_LIST_HEAD(&s->s_waiting);
645 INIT_LIST_HEAD(&s->s_unsafe);
646 s->s_num_cap_releases = 0;
647 s->s_cap_reconnect = 0;
648 s->s_cap_iterator = NULL;
649 INIT_LIST_HEAD(&s->s_cap_releases);
650 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
652 INIT_LIST_HEAD(&s->s_cap_flushing);
654 mdsc->sessions[mds] = s;
655 atomic_inc(&mdsc->num_sessions);
656 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
658 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
659 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
665 return ERR_PTR(-ENOMEM);
669 * called under mdsc->mutex
671 static void __unregister_session(struct ceph_mds_client *mdsc,
672 struct ceph_mds_session *s)
674 dout("__unregister_session mds%d %p\n", s->s_mds, s);
675 BUG_ON(mdsc->sessions[s->s_mds] != s);
676 mdsc->sessions[s->s_mds] = NULL;
678 ceph_con_close(&s->s_con);
679 ceph_put_mds_session(s);
680 atomic_dec(&mdsc->num_sessions);
684 * drop session refs in request.
686 * should be last request ref, or hold mdsc->mutex
688 static void put_request_session(struct ceph_mds_request *req)
690 if (req->r_session) {
691 ceph_put_mds_session(req->r_session);
692 req->r_session = NULL;
696 void ceph_mdsc_release_request(struct kref *kref)
698 struct ceph_mds_request *req = container_of(kref,
699 struct ceph_mds_request,
701 destroy_reply_info(&req->r_reply_info);
703 ceph_msg_put(req->r_request);
705 ceph_msg_put(req->r_reply);
707 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
708 /* avoid calling iput_final() in mds dispatch threads */
709 ceph_async_iput(req->r_inode);
712 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
713 ceph_async_iput(req->r_target_inode);
716 if (req->r_old_dentry)
717 dput(req->r_old_dentry);
718 if (req->r_old_dentry_dir) {
720 * track (and drop pins for) r_old_dentry_dir
721 * separately, since r_old_dentry's d_parent may have
722 * changed between the dir mutex being dropped and
723 * this request being freed.
725 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
727 ceph_async_iput(req->r_old_dentry_dir);
732 ceph_pagelist_release(req->r_pagelist);
733 put_request_session(req);
734 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
735 WARN_ON_ONCE(!list_empty(&req->r_wait));
739 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
742 * lookup session, bump ref if found.
744 * called under mdsc->mutex.
746 static struct ceph_mds_request *
747 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
749 struct ceph_mds_request *req;
751 req = lookup_request(&mdsc->request_tree, tid);
753 ceph_mdsc_get_request(req);
759 * Register an in-flight request, and assign a tid. Link to directory
760 * are modifying (if any).
762 * Called under mdsc->mutex.
764 static void __register_request(struct ceph_mds_client *mdsc,
765 struct ceph_mds_request *req,
770 req->r_tid = ++mdsc->last_tid;
771 if (req->r_num_caps) {
772 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
775 pr_err("__register_request %p "
776 "failed to reserve caps: %d\n", req, ret);
777 /* set req->r_err to fail early from __do_request */
782 dout("__register_request %p tid %lld\n", req, req->r_tid);
783 ceph_mdsc_get_request(req);
784 insert_request(&mdsc->request_tree, req);
786 req->r_uid = current_fsuid();
787 req->r_gid = current_fsgid();
789 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
790 mdsc->oldest_tid = req->r_tid;
794 req->r_unsafe_dir = dir;
798 static void __unregister_request(struct ceph_mds_client *mdsc,
799 struct ceph_mds_request *req)
801 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
803 /* Never leave an unregistered request on an unsafe list! */
804 list_del_init(&req->r_unsafe_item);
806 if (req->r_tid == mdsc->oldest_tid) {
807 struct rb_node *p = rb_next(&req->r_node);
808 mdsc->oldest_tid = 0;
810 struct ceph_mds_request *next_req =
811 rb_entry(p, struct ceph_mds_request, r_node);
812 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
813 mdsc->oldest_tid = next_req->r_tid;
820 erase_request(&mdsc->request_tree, req);
822 if (req->r_unsafe_dir &&
823 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
824 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
825 spin_lock(&ci->i_unsafe_lock);
826 list_del_init(&req->r_unsafe_dir_item);
827 spin_unlock(&ci->i_unsafe_lock);
829 if (req->r_target_inode &&
830 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
831 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
832 spin_lock(&ci->i_unsafe_lock);
833 list_del_init(&req->r_unsafe_target_item);
834 spin_unlock(&ci->i_unsafe_lock);
837 if (req->r_unsafe_dir) {
838 /* avoid calling iput_final() in mds dispatch threads */
839 ceph_async_iput(req->r_unsafe_dir);
840 req->r_unsafe_dir = NULL;
843 complete_all(&req->r_safe_completion);
845 ceph_mdsc_put_request(req);
849 * Walk back up the dentry tree until we hit a dentry representing a
850 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
851 * when calling this) to ensure that the objects won't disappear while we're
852 * working with them. Once we hit a candidate dentry, we attempt to take a
853 * reference to it, and return that as the result.
855 static struct inode *get_nonsnap_parent(struct dentry *dentry)
857 struct inode *inode = NULL;
859 while (dentry && !IS_ROOT(dentry)) {
860 inode = d_inode_rcu(dentry);
861 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
863 dentry = dentry->d_parent;
866 inode = igrab(inode);
871 * Choose mds to send request to next. If there is a hint set in the
872 * request (e.g., due to a prior forward hint from the mds), use that.
873 * Otherwise, consult frag tree and/or caps to identify the
874 * appropriate mds. If all else fails, choose randomly.
876 * Called under mdsc->mutex.
878 static int __choose_mds(struct ceph_mds_client *mdsc,
879 struct ceph_mds_request *req)
882 struct ceph_inode_info *ci;
883 struct ceph_cap *cap;
884 int mode = req->r_direct_mode;
886 u32 hash = req->r_direct_hash;
887 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
890 * is there a specific mds we should try? ignore hint if we have
891 * no session and the mds is not up (active or recovering).
893 if (req->r_resend_mds >= 0 &&
894 (__have_session(mdsc, req->r_resend_mds) ||
895 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
896 dout("choose_mds using resend_mds mds%d\n",
898 return req->r_resend_mds;
901 if (mode == USE_RANDOM_MDS)
906 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
907 inode = req->r_inode;
910 /* req->r_dentry is non-null for LSSNAP request */
912 inode = get_nonsnap_parent(req->r_dentry);
914 dout("__choose_mds using snapdir's parent %p\n", inode);
916 } else if (req->r_dentry) {
917 /* ignore race with rename; old or new d_parent is okay */
918 struct dentry *parent;
922 parent = READ_ONCE(req->r_dentry->d_parent);
923 dir = req->r_parent ? : d_inode_rcu(parent);
925 if (!dir || dir->i_sb != mdsc->fsc->sb) {
926 /* not this fs or parent went negative */
927 inode = d_inode(req->r_dentry);
930 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
931 /* direct snapped/virtual snapdir requests
932 * based on parent dir inode */
933 inode = get_nonsnap_parent(parent);
934 dout("__choose_mds using nonsnap parent %p\n", inode);
937 inode = d_inode(req->r_dentry);
938 if (!inode || mode == USE_AUTH_MDS) {
941 hash = ceph_dentry_hash(dir, req->r_dentry);
950 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
954 ci = ceph_inode(inode);
956 if (is_hash && S_ISDIR(inode->i_mode)) {
957 struct ceph_inode_frag frag;
960 ceph_choose_frag(ci, hash, &frag, &found);
962 if (mode == USE_ANY_MDS && frag.ndist > 0) {
965 /* choose a random replica */
966 get_random_bytes(&r, 1);
969 dout("choose_mds %p %llx.%llx "
970 "frag %u mds%d (%d/%d)\n",
971 inode, ceph_vinop(inode),
974 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
975 CEPH_MDS_STATE_ACTIVE)
979 /* since this file/dir wasn't known to be
980 * replicated, then we want to look for the
981 * authoritative mds. */
984 /* choose auth mds */
986 dout("choose_mds %p %llx.%llx "
987 "frag %u mds%d (auth)\n",
988 inode, ceph_vinop(inode), frag.frag, mds);
989 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
990 CEPH_MDS_STATE_ACTIVE)
996 spin_lock(&ci->i_ceph_lock);
998 if (mode == USE_AUTH_MDS)
999 cap = ci->i_auth_cap;
1000 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1001 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1003 spin_unlock(&ci->i_ceph_lock);
1004 ceph_async_iput(inode);
1007 mds = cap->session->s_mds;
1008 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
1009 inode, ceph_vinop(inode), mds,
1010 cap == ci->i_auth_cap ? "auth " : "", cap);
1011 spin_unlock(&ci->i_ceph_lock);
1013 /* avoid calling iput_final() while holding mdsc->mutex or
1014 * in mds dispatch threads */
1015 ceph_async_iput(inode);
1019 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1020 dout("choose_mds chose random mds%d\n", mds);
1028 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1030 struct ceph_msg *msg;
1031 struct ceph_mds_session_head *h;
1033 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1036 pr_err("create_session_msg ENOMEM creating msg\n");
1039 h = msg->front.iov_base;
1040 h->op = cpu_to_le32(op);
1041 h->seq = cpu_to_le64(seq);
1046 static void encode_supported_features(void **p, void *end)
1048 static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1049 static const size_t count = ARRAY_SIZE(bits);
1053 size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
1055 BUG_ON(*p + 4 + size > end);
1056 ceph_encode_32(p, size);
1057 memset(*p, 0, size);
1058 for (i = 0; i < count; i++)
1059 ((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
1062 BUG_ON(*p + 4 > end);
1063 ceph_encode_32(p, 0);
1068 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1069 * to include additional client metadata fields.
1071 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1073 struct ceph_msg *msg;
1074 struct ceph_mds_session_head *h;
1076 int extra_bytes = 0;
1077 int metadata_key_count = 0;
1078 struct ceph_options *opt = mdsc->fsc->client->options;
1079 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1082 const char* metadata[][2] = {
1083 {"hostname", mdsc->nodename},
1084 {"kernel_version", init_utsname()->release},
1085 {"entity_id", opt->name ? : ""},
1086 {"root", fsopt->server_path ? : "/"},
1090 /* Calculate serialized length of metadata */
1091 extra_bytes = 4; /* map length */
1092 for (i = 0; metadata[i][0]; ++i) {
1093 extra_bytes += 8 + strlen(metadata[i][0]) +
1094 strlen(metadata[i][1]);
1095 metadata_key_count++;
1097 /* supported feature */
1098 extra_bytes += 4 + 8;
1100 /* Allocate the message */
1101 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1104 pr_err("create_session_msg ENOMEM creating msg\n");
1107 p = msg->front.iov_base;
1108 end = p + msg->front.iov_len;
1111 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1112 h->seq = cpu_to_le64(seq);
1115 * Serialize client metadata into waiting buffer space, using
1116 * the format that userspace expects for map<string, string>
1118 * ClientSession messages with metadata are v2
1120 msg->hdr.version = cpu_to_le16(3);
1121 msg->hdr.compat_version = cpu_to_le16(1);
1123 /* The write pointer, following the session_head structure */
1126 /* Number of entries in the map */
1127 ceph_encode_32(&p, metadata_key_count);
1129 /* Two length-prefixed strings for each entry in the map */
1130 for (i = 0; metadata[i][0]; ++i) {
1131 size_t const key_len = strlen(metadata[i][0]);
1132 size_t const val_len = strlen(metadata[i][1]);
1134 ceph_encode_32(&p, key_len);
1135 memcpy(p, metadata[i][0], key_len);
1137 ceph_encode_32(&p, val_len);
1138 memcpy(p, metadata[i][1], val_len);
1142 encode_supported_features(&p, end);
1143 msg->front.iov_len = p - msg->front.iov_base;
1144 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1150 * send session open request.
1152 * called under mdsc->mutex
1154 static int __open_session(struct ceph_mds_client *mdsc,
1155 struct ceph_mds_session *session)
1157 struct ceph_msg *msg;
1159 int mds = session->s_mds;
1161 /* wait for mds to go active? */
1162 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1163 dout("open_session to mds%d (%s)\n", mds,
1164 ceph_mds_state_name(mstate));
1165 session->s_state = CEPH_MDS_SESSION_OPENING;
1166 session->s_renew_requested = jiffies;
1168 /* send connect message */
1169 msg = create_session_open_msg(mdsc, session->s_seq);
1172 ceph_con_send(&session->s_con, msg);
1177 * open sessions for any export targets for the given mds
1179 * called under mdsc->mutex
1181 static struct ceph_mds_session *
1182 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1184 struct ceph_mds_session *session;
1186 session = __ceph_lookup_mds_session(mdsc, target);
1188 session = register_session(mdsc, target);
1189 if (IS_ERR(session))
1192 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1193 session->s_state == CEPH_MDS_SESSION_CLOSING)
1194 __open_session(mdsc, session);
1199 struct ceph_mds_session *
1200 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1202 struct ceph_mds_session *session;
1204 dout("open_export_target_session to mds%d\n", target);
1206 mutex_lock(&mdsc->mutex);
1207 session = __open_export_target_session(mdsc, target);
1208 mutex_unlock(&mdsc->mutex);
1213 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1214 struct ceph_mds_session *session)
1216 struct ceph_mds_info *mi;
1217 struct ceph_mds_session *ts;
1218 int i, mds = session->s_mds;
1220 if (mds >= mdsc->mdsmap->m_num_mds)
1223 mi = &mdsc->mdsmap->m_info[mds];
1224 dout("open_export_target_sessions for mds%d (%d targets)\n",
1225 session->s_mds, mi->num_export_targets);
1227 for (i = 0; i < mi->num_export_targets; i++) {
1228 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1230 ceph_put_mds_session(ts);
1234 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1235 struct ceph_mds_session *session)
1237 mutex_lock(&mdsc->mutex);
1238 __open_export_target_sessions(mdsc, session);
1239 mutex_unlock(&mdsc->mutex);
1246 static void detach_cap_releases(struct ceph_mds_session *session,
1247 struct list_head *target)
1249 lockdep_assert_held(&session->s_cap_lock);
1251 list_splice_init(&session->s_cap_releases, target);
1252 session->s_num_cap_releases = 0;
1253 dout("dispose_cap_releases mds%d\n", session->s_mds);
1256 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1257 struct list_head *dispose)
1259 while (!list_empty(dispose)) {
1260 struct ceph_cap *cap;
1261 /* zero out the in-progress message */
1262 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1263 list_del(&cap->session_caps);
1264 ceph_put_cap(mdsc, cap);
1268 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1269 struct ceph_mds_session *session)
1271 struct ceph_mds_request *req;
1273 struct ceph_inode_info *ci;
1275 dout("cleanup_session_requests mds%d\n", session->s_mds);
1276 mutex_lock(&mdsc->mutex);
1277 while (!list_empty(&session->s_unsafe)) {
1278 req = list_first_entry(&session->s_unsafe,
1279 struct ceph_mds_request, r_unsafe_item);
1280 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1282 if (req->r_target_inode) {
1283 /* dropping unsafe change of inode's attributes */
1284 ci = ceph_inode(req->r_target_inode);
1285 errseq_set(&ci->i_meta_err, -EIO);
1287 if (req->r_unsafe_dir) {
1288 /* dropping unsafe directory operation */
1289 ci = ceph_inode(req->r_unsafe_dir);
1290 errseq_set(&ci->i_meta_err, -EIO);
1292 __unregister_request(mdsc, req);
1294 /* zero r_attempts, so kick_requests() will re-send requests */
1295 p = rb_first(&mdsc->request_tree);
1297 req = rb_entry(p, struct ceph_mds_request, r_node);
1299 if (req->r_session &&
1300 req->r_session->s_mds == session->s_mds)
1301 req->r_attempts = 0;
1303 mutex_unlock(&mdsc->mutex);
1307 * Helper to safely iterate over all caps associated with a session, with
1308 * special care taken to handle a racing __ceph_remove_cap().
1310 * Caller must hold session s_mutex.
1312 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1313 int (*cb)(struct inode *, struct ceph_cap *,
1316 struct list_head *p;
1317 struct ceph_cap *cap;
1318 struct inode *inode, *last_inode = NULL;
1319 struct ceph_cap *old_cap = NULL;
1322 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1323 spin_lock(&session->s_cap_lock);
1324 p = session->s_caps.next;
1325 while (p != &session->s_caps) {
1326 cap = list_entry(p, struct ceph_cap, session_caps);
1327 inode = igrab(&cap->ci->vfs_inode);
1332 session->s_cap_iterator = cap;
1333 spin_unlock(&session->s_cap_lock);
1336 /* avoid calling iput_final() while holding
1337 * s_mutex or in mds dispatch threads */
1338 ceph_async_iput(last_inode);
1342 ceph_put_cap(session->s_mdsc, old_cap);
1346 ret = cb(inode, cap, arg);
1349 spin_lock(&session->s_cap_lock);
1352 dout("iterate_session_caps finishing cap %p removal\n",
1354 BUG_ON(cap->session != session);
1355 cap->session = NULL;
1356 list_del_init(&cap->session_caps);
1357 session->s_nr_caps--;
1358 if (cap->queue_release)
1359 __ceph_queue_cap_release(session, cap);
1361 old_cap = cap; /* put_cap it w/o locks held */
1368 session->s_cap_iterator = NULL;
1369 spin_unlock(&session->s_cap_lock);
1371 ceph_async_iput(last_inode);
1373 ceph_put_cap(session->s_mdsc, old_cap);
1378 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1381 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1382 struct ceph_inode_info *ci = ceph_inode(inode);
1383 LIST_HEAD(to_remove);
1384 bool dirty_dropped = false;
1385 bool invalidate = false;
1387 dout("removing cap %p, ci is %p, inode is %p\n",
1388 cap, ci, &ci->vfs_inode);
1389 spin_lock(&ci->i_ceph_lock);
1390 if (cap->mds_wanted | cap->issued)
1391 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1392 __ceph_remove_cap(cap, false);
1393 if (!ci->i_auth_cap) {
1394 struct ceph_cap_flush *cf;
1395 struct ceph_mds_client *mdsc = fsc->mdsc;
1397 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1398 if (inode->i_data.nrpages > 0)
1400 if (ci->i_wrbuffer_ref > 0)
1401 mapping_set_error(&inode->i_data, -EIO);
1404 while (!list_empty(&ci->i_cap_flush_list)) {
1405 cf = list_first_entry(&ci->i_cap_flush_list,
1406 struct ceph_cap_flush, i_list);
1407 list_move(&cf->i_list, &to_remove);
1410 spin_lock(&mdsc->cap_dirty_lock);
1412 list_for_each_entry(cf, &to_remove, i_list)
1413 list_del(&cf->g_list);
1415 if (!list_empty(&ci->i_dirty_item)) {
1416 pr_warn_ratelimited(
1417 " dropping dirty %s state for %p %lld\n",
1418 ceph_cap_string(ci->i_dirty_caps),
1419 inode, ceph_ino(inode));
1420 ci->i_dirty_caps = 0;
1421 list_del_init(&ci->i_dirty_item);
1422 dirty_dropped = true;
1424 if (!list_empty(&ci->i_flushing_item)) {
1425 pr_warn_ratelimited(
1426 " dropping dirty+flushing %s state for %p %lld\n",
1427 ceph_cap_string(ci->i_flushing_caps),
1428 inode, ceph_ino(inode));
1429 ci->i_flushing_caps = 0;
1430 list_del_init(&ci->i_flushing_item);
1431 mdsc->num_cap_flushing--;
1432 dirty_dropped = true;
1434 spin_unlock(&mdsc->cap_dirty_lock);
1436 if (dirty_dropped) {
1437 errseq_set(&ci->i_meta_err, -EIO);
1439 if (ci->i_wrbuffer_ref_head == 0 &&
1440 ci->i_wr_ref == 0 &&
1441 ci->i_dirty_caps == 0 &&
1442 ci->i_flushing_caps == 0) {
1443 ceph_put_snap_context(ci->i_head_snapc);
1444 ci->i_head_snapc = NULL;
1448 if (atomic_read(&ci->i_filelock_ref) > 0) {
1449 /* make further file lock syscall return -EIO */
1450 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1451 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1452 inode, ceph_ino(inode));
1455 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1456 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1457 ci->i_prealloc_cap_flush = NULL;
1460 spin_unlock(&ci->i_ceph_lock);
1461 while (!list_empty(&to_remove)) {
1462 struct ceph_cap_flush *cf;
1463 cf = list_first_entry(&to_remove,
1464 struct ceph_cap_flush, i_list);
1465 list_del(&cf->i_list);
1466 ceph_free_cap_flush(cf);
1469 wake_up_all(&ci->i_cap_wq);
1471 ceph_queue_invalidate(inode);
1478 * caller must hold session s_mutex
1480 static void remove_session_caps(struct ceph_mds_session *session)
1482 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1483 struct super_block *sb = fsc->sb;
1486 dout("remove_session_caps on %p\n", session);
1487 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1489 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1491 spin_lock(&session->s_cap_lock);
1492 if (session->s_nr_caps > 0) {
1493 struct inode *inode;
1494 struct ceph_cap *cap, *prev = NULL;
1495 struct ceph_vino vino;
1497 * iterate_session_caps() skips inodes that are being
1498 * deleted, we need to wait until deletions are complete.
1499 * __wait_on_freeing_inode() is designed for the job,
1500 * but it is not exported, so use lookup inode function
1503 while (!list_empty(&session->s_caps)) {
1504 cap = list_entry(session->s_caps.next,
1505 struct ceph_cap, session_caps);
1509 vino = cap->ci->i_vino;
1510 spin_unlock(&session->s_cap_lock);
1512 inode = ceph_find_inode(sb, vino);
1513 /* avoid calling iput_final() while holding s_mutex */
1514 ceph_async_iput(inode);
1516 spin_lock(&session->s_cap_lock);
1520 // drop cap expires and unlock s_cap_lock
1521 detach_cap_releases(session, &dispose);
1523 BUG_ON(session->s_nr_caps > 0);
1524 BUG_ON(!list_empty(&session->s_cap_flushing));
1525 spin_unlock(&session->s_cap_lock);
1526 dispose_cap_releases(session->s_mdsc, &dispose);
1536 * wake up any threads waiting on this session's caps. if the cap is
1537 * old (didn't get renewed on the client reconnect), remove it now.
1539 * caller must hold s_mutex.
1541 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1544 struct ceph_inode_info *ci = ceph_inode(inode);
1545 unsigned long ev = (unsigned long)arg;
1547 if (ev == RECONNECT) {
1548 spin_lock(&ci->i_ceph_lock);
1549 ci->i_wanted_max_size = 0;
1550 ci->i_requested_max_size = 0;
1551 spin_unlock(&ci->i_ceph_lock);
1552 } else if (ev == RENEWCAPS) {
1553 if (cap->cap_gen < cap->session->s_cap_gen) {
1554 /* mds did not re-issue stale cap */
1555 spin_lock(&ci->i_ceph_lock);
1556 cap->issued = cap->implemented = CEPH_CAP_PIN;
1557 /* make sure mds knows what we want */
1558 if (__ceph_caps_file_wanted(ci) & ~cap->mds_wanted)
1559 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1560 spin_unlock(&ci->i_ceph_lock);
1562 } else if (ev == FORCE_RO) {
1564 wake_up_all(&ci->i_cap_wq);
1568 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1570 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1571 ceph_iterate_session_caps(session, wake_up_session_cb,
1572 (void *)(unsigned long)ev);
1576 * Send periodic message to MDS renewing all currently held caps. The
1577 * ack will reset the expiration for all caps from this session.
1579 * caller holds s_mutex
1581 static int send_renew_caps(struct ceph_mds_client *mdsc,
1582 struct ceph_mds_session *session)
1584 struct ceph_msg *msg;
1587 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1588 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1589 pr_info("mds%d caps stale\n", session->s_mds);
1590 session->s_renew_requested = jiffies;
1592 /* do not try to renew caps until a recovering mds has reconnected
1593 * with its clients. */
1594 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1595 if (state < CEPH_MDS_STATE_RECONNECT) {
1596 dout("send_renew_caps ignoring mds%d (%s)\n",
1597 session->s_mds, ceph_mds_state_name(state));
1601 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1602 ceph_mds_state_name(state));
1603 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1604 ++session->s_renew_seq);
1607 ceph_con_send(&session->s_con, msg);
1611 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1612 struct ceph_mds_session *session, u64 seq)
1614 struct ceph_msg *msg;
1616 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1617 session->s_mds, ceph_session_state_name(session->s_state), seq);
1618 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1621 ceph_con_send(&session->s_con, msg);
1627 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1629 * Called under session->s_mutex
1631 static void renewed_caps(struct ceph_mds_client *mdsc,
1632 struct ceph_mds_session *session, int is_renew)
1637 spin_lock(&session->s_cap_lock);
1638 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1640 session->s_cap_ttl = session->s_renew_requested +
1641 mdsc->mdsmap->m_session_timeout*HZ;
1644 if (time_before(jiffies, session->s_cap_ttl)) {
1645 pr_info("mds%d caps renewed\n", session->s_mds);
1648 pr_info("mds%d caps still stale\n", session->s_mds);
1651 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1652 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1653 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1654 spin_unlock(&session->s_cap_lock);
1657 wake_up_session_caps(session, RENEWCAPS);
1661 * send a session close request
1663 static int request_close_session(struct ceph_mds_client *mdsc,
1664 struct ceph_mds_session *session)
1666 struct ceph_msg *msg;
1668 dout("request_close_session mds%d state %s seq %lld\n",
1669 session->s_mds, ceph_session_state_name(session->s_state),
1671 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1674 ceph_con_send(&session->s_con, msg);
1679 * Called with s_mutex held.
1681 static int __close_session(struct ceph_mds_client *mdsc,
1682 struct ceph_mds_session *session)
1684 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1686 session->s_state = CEPH_MDS_SESSION_CLOSING;
1687 return request_close_session(mdsc, session);
1690 static bool drop_negative_children(struct dentry *dentry)
1692 struct dentry *child;
1693 bool all_negative = true;
1695 if (!d_is_dir(dentry))
1698 spin_lock(&dentry->d_lock);
1699 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1700 if (d_really_is_positive(child)) {
1701 all_negative = false;
1705 spin_unlock(&dentry->d_lock);
1708 shrink_dcache_parent(dentry);
1710 return all_negative;
1714 * Trim old(er) caps.
1716 * Because we can't cache an inode without one or more caps, we do
1717 * this indirectly: if a cap is unused, we prune its aliases, at which
1718 * point the inode will hopefully get dropped to.
1720 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1721 * memory pressure from the MDS, though, so it needn't be perfect.
1723 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1725 int *remaining = arg;
1726 struct ceph_inode_info *ci = ceph_inode(inode);
1727 int used, wanted, oissued, mine;
1729 if (*remaining <= 0)
1732 spin_lock(&ci->i_ceph_lock);
1733 mine = cap->issued | cap->implemented;
1734 used = __ceph_caps_used(ci);
1735 wanted = __ceph_caps_file_wanted(ci);
1736 oissued = __ceph_caps_issued_other(ci, cap);
1738 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1739 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1740 ceph_cap_string(used), ceph_cap_string(wanted));
1741 if (cap == ci->i_auth_cap) {
1742 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1743 !list_empty(&ci->i_cap_snaps))
1745 if ((used | wanted) & CEPH_CAP_ANY_WR)
1747 /* Note: it's possible that i_filelock_ref becomes non-zero
1748 * after dropping auth caps. It doesn't hurt because reply
1749 * of lock mds request will re-add auth caps. */
1750 if (atomic_read(&ci->i_filelock_ref) > 0)
1753 /* The inode has cached pages, but it's no longer used.
1754 * we can safely drop it */
1755 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1756 !(oissued & CEPH_CAP_FILE_CACHE)) {
1760 if ((used | wanted) & ~oissued & mine)
1761 goto out; /* we need these caps */
1764 /* we aren't the only cap.. just remove us */
1765 __ceph_remove_cap(cap, true);
1768 struct dentry *dentry;
1769 /* try dropping referring dentries */
1770 spin_unlock(&ci->i_ceph_lock);
1771 dentry = d_find_any_alias(inode);
1772 if (dentry && drop_negative_children(dentry)) {
1775 d_prune_aliases(inode);
1776 count = atomic_read(&inode->i_count);
1779 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1788 spin_unlock(&ci->i_ceph_lock);
1793 * Trim session cap count down to some max number.
1795 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1796 struct ceph_mds_session *session,
1799 int trim_caps = session->s_nr_caps - max_caps;
1801 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1802 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1803 if (trim_caps > 0) {
1804 int remaining = trim_caps;
1806 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
1807 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1808 session->s_mds, session->s_nr_caps, max_caps,
1809 trim_caps - remaining);
1812 ceph_flush_cap_releases(mdsc, session);
1816 static int check_caps_flush(struct ceph_mds_client *mdsc,
1821 spin_lock(&mdsc->cap_dirty_lock);
1822 if (!list_empty(&mdsc->cap_flush_list)) {
1823 struct ceph_cap_flush *cf =
1824 list_first_entry(&mdsc->cap_flush_list,
1825 struct ceph_cap_flush, g_list);
1826 if (cf->tid <= want_flush_tid) {
1827 dout("check_caps_flush still flushing tid "
1828 "%llu <= %llu\n", cf->tid, want_flush_tid);
1832 spin_unlock(&mdsc->cap_dirty_lock);
1837 * flush all dirty inode data to disk.
1839 * returns true if we've flushed through want_flush_tid
1841 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1844 dout("check_caps_flush want %llu\n", want_flush_tid);
1846 wait_event(mdsc->cap_flushing_wq,
1847 check_caps_flush(mdsc, want_flush_tid));
1849 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1853 * called under s_mutex
1855 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1856 struct ceph_mds_session *session)
1858 struct ceph_msg *msg = NULL;
1859 struct ceph_mds_cap_release *head;
1860 struct ceph_mds_cap_item *item;
1861 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1862 struct ceph_cap *cap;
1863 LIST_HEAD(tmp_list);
1864 int num_cap_releases;
1865 __le32 barrier, *cap_barrier;
1867 down_read(&osdc->lock);
1868 barrier = cpu_to_le32(osdc->epoch_barrier);
1869 up_read(&osdc->lock);
1871 spin_lock(&session->s_cap_lock);
1873 list_splice_init(&session->s_cap_releases, &tmp_list);
1874 num_cap_releases = session->s_num_cap_releases;
1875 session->s_num_cap_releases = 0;
1876 spin_unlock(&session->s_cap_lock);
1878 while (!list_empty(&tmp_list)) {
1880 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1881 PAGE_SIZE, GFP_NOFS, false);
1884 head = msg->front.iov_base;
1885 head->num = cpu_to_le32(0);
1886 msg->front.iov_len = sizeof(*head);
1888 msg->hdr.version = cpu_to_le16(2);
1889 msg->hdr.compat_version = cpu_to_le16(1);
1892 cap = list_first_entry(&tmp_list, struct ceph_cap,
1894 list_del(&cap->session_caps);
1897 head = msg->front.iov_base;
1898 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
1900 item = msg->front.iov_base + msg->front.iov_len;
1901 item->ino = cpu_to_le64(cap->cap_ino);
1902 item->cap_id = cpu_to_le64(cap->cap_id);
1903 item->migrate_seq = cpu_to_le32(cap->mseq);
1904 item->seq = cpu_to_le32(cap->issue_seq);
1905 msg->front.iov_len += sizeof(*item);
1907 ceph_put_cap(mdsc, cap);
1909 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1910 // Append cap_barrier field
1911 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1912 *cap_barrier = barrier;
1913 msg->front.iov_len += sizeof(*cap_barrier);
1915 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1916 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1917 ceph_con_send(&session->s_con, msg);
1922 BUG_ON(num_cap_releases != 0);
1924 spin_lock(&session->s_cap_lock);
1925 if (!list_empty(&session->s_cap_releases))
1927 spin_unlock(&session->s_cap_lock);
1930 // Append cap_barrier field
1931 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1932 *cap_barrier = barrier;
1933 msg->front.iov_len += sizeof(*cap_barrier);
1935 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1936 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1937 ceph_con_send(&session->s_con, msg);
1941 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1943 spin_lock(&session->s_cap_lock);
1944 list_splice(&tmp_list, &session->s_cap_releases);
1945 session->s_num_cap_releases += num_cap_releases;
1946 spin_unlock(&session->s_cap_lock);
1949 static void ceph_cap_release_work(struct work_struct *work)
1951 struct ceph_mds_session *session =
1952 container_of(work, struct ceph_mds_session, s_cap_release_work);
1954 mutex_lock(&session->s_mutex);
1955 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
1956 session->s_state == CEPH_MDS_SESSION_HUNG)
1957 ceph_send_cap_releases(session->s_mdsc, session);
1958 mutex_unlock(&session->s_mutex);
1959 ceph_put_mds_session(session);
1962 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
1963 struct ceph_mds_session *session)
1968 get_session(session);
1969 if (queue_work(mdsc->fsc->cap_wq,
1970 &session->s_cap_release_work)) {
1971 dout("cap release work queued\n");
1973 ceph_put_mds_session(session);
1974 dout("failed to queue cap release work\n");
1979 * caller holds session->s_cap_lock
1981 void __ceph_queue_cap_release(struct ceph_mds_session *session,
1982 struct ceph_cap *cap)
1984 list_add_tail(&cap->session_caps, &session->s_cap_releases);
1985 session->s_num_cap_releases++;
1987 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
1988 ceph_flush_cap_releases(session->s_mdsc, session);
1991 static void ceph_cap_reclaim_work(struct work_struct *work)
1993 struct ceph_mds_client *mdsc =
1994 container_of(work, struct ceph_mds_client, cap_reclaim_work);
1995 int ret = ceph_trim_dentries(mdsc);
1997 ceph_queue_cap_reclaim_work(mdsc);
2000 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2005 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2006 dout("caps reclaim work queued\n");
2008 dout("failed to queue caps release work\n");
2012 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2017 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2018 if (!(val % CEPH_CAPS_PER_RELEASE)) {
2019 atomic_set(&mdsc->cap_reclaim_pending, 0);
2020 ceph_queue_cap_reclaim_work(mdsc);
2028 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2031 struct ceph_inode_info *ci = ceph_inode(dir);
2032 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2033 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2034 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2035 int order, num_entries;
2037 spin_lock(&ci->i_ceph_lock);
2038 num_entries = ci->i_files + ci->i_subdirs;
2039 spin_unlock(&ci->i_ceph_lock);
2040 num_entries = max(num_entries, 1);
2041 num_entries = min(num_entries, opt->max_readdir);
2043 order = get_order(size * num_entries);
2044 while (order >= 0) {
2045 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2048 if (rinfo->dir_entries)
2052 if (!rinfo->dir_entries)
2055 num_entries = (PAGE_SIZE << order) / size;
2056 num_entries = min(num_entries, opt->max_readdir);
2058 rinfo->dir_buf_size = PAGE_SIZE << order;
2059 req->r_num_caps = num_entries + 1;
2060 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2061 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2066 * Create an mds request.
2068 struct ceph_mds_request *
2069 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2071 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
2072 struct timespec64 ts;
2075 return ERR_PTR(-ENOMEM);
2077 mutex_init(&req->r_fill_mutex);
2079 req->r_started = jiffies;
2080 req->r_resend_mds = -1;
2081 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2082 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2084 kref_init(&req->r_kref);
2085 RB_CLEAR_NODE(&req->r_node);
2086 INIT_LIST_HEAD(&req->r_wait);
2087 init_completion(&req->r_completion);
2088 init_completion(&req->r_safe_completion);
2089 INIT_LIST_HEAD(&req->r_unsafe_item);
2091 ktime_get_coarse_real_ts64(&ts);
2092 req->r_stamp = timespec64_trunc(ts, mdsc->fsc->sb->s_time_gran);
2095 req->r_direct_mode = mode;
2100 * return oldest (lowest) request, tid in request tree, 0 if none.
2102 * called under mdsc->mutex.
2104 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2106 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2108 return rb_entry(rb_first(&mdsc->request_tree),
2109 struct ceph_mds_request, r_node);
2112 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2114 return mdsc->oldest_tid;
2118 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2119 * on build_path_from_dentry in fs/cifs/dir.c.
2121 * If @stop_on_nosnap, generate path relative to the first non-snapped
2124 * Encode hidden .snap dirs as a double /, i.e.
2125 * foo/.snap/bar -> foo//bar
2127 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2130 struct dentry *temp;
2137 return ERR_PTR(-EINVAL);
2141 return ERR_PTR(-ENOMEM);
2146 seq = read_seqbegin(&rename_lock);
2150 struct inode *inode;
2152 spin_lock(&temp->d_lock);
2153 inode = d_inode(temp);
2154 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2155 dout("build_path path+%d: %p SNAPDIR\n",
2157 } else if (stop_on_nosnap && inode && dentry != temp &&
2158 ceph_snap(inode) == CEPH_NOSNAP) {
2159 spin_unlock(&temp->d_lock);
2160 pos++; /* get rid of any prepended '/' */
2163 pos -= temp->d_name.len;
2165 spin_unlock(&temp->d_lock);
2168 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2170 spin_unlock(&temp->d_lock);
2171 temp = READ_ONCE(temp->d_parent);
2173 /* Are we at the root? */
2177 /* Are we out of buffer? */
2183 base = ceph_ino(d_inode(temp));
2185 if (pos < 0 || read_seqretry(&rename_lock, seq)) {
2186 pr_err("build_path did not end path lookup where "
2187 "expected, pos is %d\n", pos);
2188 /* presumably this is only possible if racing with a
2189 rename of one of the parent directories (we can not
2190 lock the dentries above us to prevent this, but
2191 retrying should be harmless) */
2196 *plen = PATH_MAX - 1 - pos;
2197 dout("build_path on %p %d built %llx '%.*s'\n",
2198 dentry, d_count(dentry), base, *plen, path + pos);
2202 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2203 const char **ppath, int *ppathlen, u64 *pino,
2204 bool *pfreepath, bool parent_locked)
2210 dir = d_inode_rcu(dentry->d_parent);
2211 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2212 *pino = ceph_ino(dir);
2214 *ppath = dentry->d_name.name;
2215 *ppathlen = dentry->d_name.len;
2219 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2221 return PTR_ERR(path);
2227 static int build_inode_path(struct inode *inode,
2228 const char **ppath, int *ppathlen, u64 *pino,
2231 struct dentry *dentry;
2234 if (ceph_snap(inode) == CEPH_NOSNAP) {
2235 *pino = ceph_ino(inode);
2239 dentry = d_find_alias(inode);
2240 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2243 return PTR_ERR(path);
2250 * request arguments may be specified via an inode *, a dentry *, or
2251 * an explicit ino+path.
2253 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2254 struct inode *rdiri, const char *rpath,
2255 u64 rino, const char **ppath, int *pathlen,
2256 u64 *ino, bool *freepath, bool parent_locked)
2261 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2262 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2264 } else if (rdentry) {
2265 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2266 freepath, parent_locked);
2267 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2269 } else if (rpath || rino) {
2272 *pathlen = rpath ? strlen(rpath) : 0;
2273 dout(" path %.*s\n", *pathlen, rpath);
2280 * called under mdsc->mutex
2282 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2283 struct ceph_mds_request *req,
2284 int mds, bool drop_cap_releases)
2286 struct ceph_msg *msg;
2287 struct ceph_mds_request_head *head;
2288 const char *path1 = NULL;
2289 const char *path2 = NULL;
2290 u64 ino1 = 0, ino2 = 0;
2291 int pathlen1 = 0, pathlen2 = 0;
2292 bool freepath1 = false, freepath2 = false;
2298 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2299 req->r_parent, req->r_path1, req->r_ino1.ino,
2300 &path1, &pathlen1, &ino1, &freepath1,
2301 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2302 &req->r_req_flags));
2308 /* If r_old_dentry is set, then assume that its parent is locked */
2309 ret = set_request_path_attr(NULL, req->r_old_dentry,
2310 req->r_old_dentry_dir,
2311 req->r_path2, req->r_ino2.ino,
2312 &path2, &pathlen2, &ino2, &freepath2, true);
2318 len = sizeof(*head) +
2319 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2320 sizeof(struct ceph_timespec);
2322 /* calculate (max) length for cap releases */
2323 len += sizeof(struct ceph_mds_request_release) *
2324 (!!req->r_inode_drop + !!req->r_dentry_drop +
2325 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2326 if (req->r_dentry_drop)
2328 if (req->r_old_dentry_drop)
2331 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2333 msg = ERR_PTR(-ENOMEM);
2337 msg->hdr.version = cpu_to_le16(2);
2338 msg->hdr.tid = cpu_to_le64(req->r_tid);
2340 head = msg->front.iov_base;
2341 p = msg->front.iov_base + sizeof(*head);
2342 end = msg->front.iov_base + msg->front.iov_len;
2344 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2345 head->op = cpu_to_le32(req->r_op);
2346 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2347 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2348 head->args = req->r_args;
2350 ceph_encode_filepath(&p, end, ino1, path1);
2351 ceph_encode_filepath(&p, end, ino2, path2);
2353 /* make note of release offset, in case we need to replay */
2354 req->r_request_release_offset = p - msg->front.iov_base;
2358 if (req->r_inode_drop)
2359 releases += ceph_encode_inode_release(&p,
2360 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2361 mds, req->r_inode_drop, req->r_inode_unless, 0);
2362 if (req->r_dentry_drop)
2363 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2364 req->r_parent, mds, req->r_dentry_drop,
2365 req->r_dentry_unless);
2366 if (req->r_old_dentry_drop)
2367 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2368 req->r_old_dentry_dir, mds,
2369 req->r_old_dentry_drop,
2370 req->r_old_dentry_unless);
2371 if (req->r_old_inode_drop)
2372 releases += ceph_encode_inode_release(&p,
2373 d_inode(req->r_old_dentry),
2374 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2376 if (drop_cap_releases) {
2378 p = msg->front.iov_base + req->r_request_release_offset;
2381 head->num_releases = cpu_to_le16(releases);
2385 struct ceph_timespec ts;
2386 ceph_encode_timespec64(&ts, &req->r_stamp);
2387 ceph_encode_copy(&p, &ts, sizeof(ts));
2391 msg->front.iov_len = p - msg->front.iov_base;
2392 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2394 if (req->r_pagelist) {
2395 struct ceph_pagelist *pagelist = req->r_pagelist;
2396 ceph_msg_data_add_pagelist(msg, pagelist);
2397 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2399 msg->hdr.data_len = 0;
2402 msg->hdr.data_off = cpu_to_le16(0);
2406 ceph_mdsc_free_path((char *)path2, pathlen2);
2409 ceph_mdsc_free_path((char *)path1, pathlen1);
2415 * called under mdsc->mutex if error, under no mutex if
2418 static void complete_request(struct ceph_mds_client *mdsc,
2419 struct ceph_mds_request *req)
2421 if (req->r_callback)
2422 req->r_callback(mdsc, req);
2423 complete_all(&req->r_completion);
2427 * called under mdsc->mutex
2429 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2430 struct ceph_mds_request *req,
2431 int mds, bool drop_cap_releases)
2433 struct ceph_mds_request_head *rhead;
2434 struct ceph_msg *msg;
2439 struct ceph_cap *cap =
2440 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2443 req->r_sent_on_mseq = cap->mseq;
2445 req->r_sent_on_mseq = -1;
2447 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2448 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2450 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2453 * Replay. Do not regenerate message (and rebuild
2454 * paths, etc.); just use the original message.
2455 * Rebuilding paths will break for renames because
2456 * d_move mangles the src name.
2458 msg = req->r_request;
2459 rhead = msg->front.iov_base;
2461 flags = le32_to_cpu(rhead->flags);
2462 flags |= CEPH_MDS_FLAG_REPLAY;
2463 rhead->flags = cpu_to_le32(flags);
2465 if (req->r_target_inode)
2466 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2468 rhead->num_retry = req->r_attempts - 1;
2470 /* remove cap/dentry releases from message */
2471 rhead->num_releases = 0;
2474 p = msg->front.iov_base + req->r_request_release_offset;
2476 struct ceph_timespec ts;
2477 ceph_encode_timespec64(&ts, &req->r_stamp);
2478 ceph_encode_copy(&p, &ts, sizeof(ts));
2481 msg->front.iov_len = p - msg->front.iov_base;
2482 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2486 if (req->r_request) {
2487 ceph_msg_put(req->r_request);
2488 req->r_request = NULL;
2490 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2492 req->r_err = PTR_ERR(msg);
2493 return PTR_ERR(msg);
2495 req->r_request = msg;
2497 rhead = msg->front.iov_base;
2498 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2499 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2500 flags |= CEPH_MDS_FLAG_REPLAY;
2502 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2503 rhead->flags = cpu_to_le32(flags);
2504 rhead->num_fwd = req->r_num_fwd;
2505 rhead->num_retry = req->r_attempts - 1;
2508 dout(" r_parent = %p\n", req->r_parent);
2513 * send request, or put it on the appropriate wait list.
2515 static void __do_request(struct ceph_mds_client *mdsc,
2516 struct ceph_mds_request *req)
2518 struct ceph_mds_session *session = NULL;
2522 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2523 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2524 __unregister_request(mdsc, req);
2528 if (req->r_timeout &&
2529 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2530 dout("do_request timed out\n");
2534 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2535 dout("do_request forced umount\n");
2539 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2540 if (mdsc->mdsmap_err) {
2541 err = mdsc->mdsmap_err;
2542 dout("do_request mdsmap err %d\n", err);
2545 if (mdsc->mdsmap->m_epoch == 0) {
2546 dout("do_request no mdsmap, waiting for map\n");
2547 list_add(&req->r_wait, &mdsc->waiting_for_map);
2550 if (!(mdsc->fsc->mount_options->flags &
2551 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2552 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2554 pr_info("probably no mds server is up\n");
2559 put_request_session(req);
2561 mds = __choose_mds(mdsc, req);
2563 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2564 dout("do_request no mds or not active, waiting for map\n");
2565 list_add(&req->r_wait, &mdsc->waiting_for_map);
2569 /* get, open session */
2570 session = __ceph_lookup_mds_session(mdsc, mds);
2572 session = register_session(mdsc, mds);
2573 if (IS_ERR(session)) {
2574 err = PTR_ERR(session);
2578 req->r_session = get_session(session);
2580 dout("do_request mds%d session %p state %s\n", mds, session,
2581 ceph_session_state_name(session->s_state));
2582 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2583 session->s_state != CEPH_MDS_SESSION_HUNG) {
2584 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2588 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2589 session->s_state == CEPH_MDS_SESSION_CLOSING)
2590 __open_session(mdsc, session);
2591 list_add(&req->r_wait, &session->s_waiting);
2596 req->r_resend_mds = -1; /* forget any previous mds hint */
2598 if (req->r_request_started == 0) /* note request start time */
2599 req->r_request_started = jiffies;
2601 err = __prepare_send_request(mdsc, req, mds, false);
2603 ceph_msg_get(req->r_request);
2604 ceph_con_send(&session->s_con, req->r_request);
2608 ceph_put_mds_session(session);
2611 dout("__do_request early error %d\n", err);
2613 complete_request(mdsc, req);
2614 __unregister_request(mdsc, req);
2620 * called under mdsc->mutex
2622 static void __wake_requests(struct ceph_mds_client *mdsc,
2623 struct list_head *head)
2625 struct ceph_mds_request *req;
2626 LIST_HEAD(tmp_list);
2628 list_splice_init(head, &tmp_list);
2630 while (!list_empty(&tmp_list)) {
2631 req = list_entry(tmp_list.next,
2632 struct ceph_mds_request, r_wait);
2633 list_del_init(&req->r_wait);
2634 dout(" wake request %p tid %llu\n", req, req->r_tid);
2635 __do_request(mdsc, req);
2640 * Wake up threads with requests pending for @mds, so that they can
2641 * resubmit their requests to a possibly different mds.
2643 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2645 struct ceph_mds_request *req;
2646 struct rb_node *p = rb_first(&mdsc->request_tree);
2648 dout("kick_requests mds%d\n", mds);
2650 req = rb_entry(p, struct ceph_mds_request, r_node);
2652 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2654 if (req->r_attempts > 0)
2655 continue; /* only new requests */
2656 if (req->r_session &&
2657 req->r_session->s_mds == mds) {
2658 dout(" kicking tid %llu\n", req->r_tid);
2659 list_del_init(&req->r_wait);
2660 __do_request(mdsc, req);
2665 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2666 struct ceph_mds_request *req)
2670 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2672 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2674 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2675 if (req->r_old_dentry_dir)
2676 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2679 dout("submit_request on %p for inode %p\n", req, dir);
2680 mutex_lock(&mdsc->mutex);
2681 __register_request(mdsc, req, dir);
2682 __do_request(mdsc, req);
2684 mutex_unlock(&mdsc->mutex);
2688 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2689 struct ceph_mds_request *req)
2694 dout("do_request waiting\n");
2695 if (!req->r_timeout && req->r_wait_for_completion) {
2696 err = req->r_wait_for_completion(mdsc, req);
2698 long timeleft = wait_for_completion_killable_timeout(
2700 ceph_timeout_jiffies(req->r_timeout));
2704 err = -EIO; /* timed out */
2706 err = timeleft; /* killed */
2708 dout("do_request waited, got %d\n", err);
2709 mutex_lock(&mdsc->mutex);
2711 /* only abort if we didn't race with a real reply */
2712 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2713 err = le32_to_cpu(req->r_reply_info.head->result);
2714 } else if (err < 0) {
2715 dout("aborted request %lld with %d\n", req->r_tid, err);
2718 * ensure we aren't running concurrently with
2719 * ceph_fill_trace or ceph_readdir_prepopulate, which
2720 * rely on locks (dir mutex) held by our caller.
2722 mutex_lock(&req->r_fill_mutex);
2724 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2725 mutex_unlock(&req->r_fill_mutex);
2727 if (req->r_parent &&
2728 (req->r_op & CEPH_MDS_OP_WRITE))
2729 ceph_invalidate_dir_request(req);
2734 mutex_unlock(&mdsc->mutex);
2739 * Synchrously perform an mds request. Take care of all of the
2740 * session setup, forwarding, retry details.
2742 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2744 struct ceph_mds_request *req)
2748 dout("do_request on %p\n", req);
2751 err = ceph_mdsc_submit_request(mdsc, dir, req);
2753 err = ceph_mdsc_wait_request(mdsc, req);
2754 dout("do_request %p done, result %d\n", req, err);
2759 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2760 * namespace request.
2762 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2764 struct inode *dir = req->r_parent;
2765 struct inode *old_dir = req->r_old_dentry_dir;
2767 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2769 ceph_dir_clear_complete(dir);
2771 ceph_dir_clear_complete(old_dir);
2773 ceph_invalidate_dentry_lease(req->r_dentry);
2774 if (req->r_old_dentry)
2775 ceph_invalidate_dentry_lease(req->r_old_dentry);
2781 * We take the session mutex and parse and process the reply immediately.
2782 * This preserves the logical ordering of replies, capabilities, etc., sent
2783 * by the MDS as they are applied to our local cache.
2785 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2787 struct ceph_mds_client *mdsc = session->s_mdsc;
2788 struct ceph_mds_request *req;
2789 struct ceph_mds_reply_head *head = msg->front.iov_base;
2790 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2791 struct ceph_snap_realm *realm;
2794 int mds = session->s_mds;
2796 if (msg->front.iov_len < sizeof(*head)) {
2797 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2802 /* get request, session */
2803 tid = le64_to_cpu(msg->hdr.tid);
2804 mutex_lock(&mdsc->mutex);
2805 req = lookup_get_request(mdsc, tid);
2807 dout("handle_reply on unknown tid %llu\n", tid);
2808 mutex_unlock(&mdsc->mutex);
2811 dout("handle_reply %p\n", req);
2813 /* correct session? */
2814 if (req->r_session != session) {
2815 pr_err("mdsc_handle_reply got %llu on session mds%d"
2816 " not mds%d\n", tid, session->s_mds,
2817 req->r_session ? req->r_session->s_mds : -1);
2818 mutex_unlock(&mdsc->mutex);
2823 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2824 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2825 pr_warn("got a dup %s reply on %llu from mds%d\n",
2826 head->safe ? "safe" : "unsafe", tid, mds);
2827 mutex_unlock(&mdsc->mutex);
2830 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2831 pr_warn("got unsafe after safe on %llu from mds%d\n",
2833 mutex_unlock(&mdsc->mutex);
2837 result = le32_to_cpu(head->result);
2841 * if we're not talking to the authority, send to them
2842 * if the authority has changed while we weren't looking,
2843 * send to new authority
2844 * Otherwise we just have to return an ESTALE
2846 if (result == -ESTALE) {
2847 dout("got ESTALE on request %llu\n", req->r_tid);
2848 req->r_resend_mds = -1;
2849 if (req->r_direct_mode != USE_AUTH_MDS) {
2850 dout("not using auth, setting for that now\n");
2851 req->r_direct_mode = USE_AUTH_MDS;
2852 __do_request(mdsc, req);
2853 mutex_unlock(&mdsc->mutex);
2856 int mds = __choose_mds(mdsc, req);
2857 if (mds >= 0 && mds != req->r_session->s_mds) {
2858 dout("but auth changed, so resending\n");
2859 __do_request(mdsc, req);
2860 mutex_unlock(&mdsc->mutex);
2864 dout("have to return ESTALE on request %llu\n", req->r_tid);
2869 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2870 __unregister_request(mdsc, req);
2872 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2874 * We already handled the unsafe response, now do the
2875 * cleanup. No need to examine the response; the MDS
2876 * doesn't include any result info in the safe
2877 * response. And even if it did, there is nothing
2878 * useful we could do with a revised return value.
2880 dout("got safe reply %llu, mds%d\n", tid, mds);
2882 /* last unsafe request during umount? */
2883 if (mdsc->stopping && !__get_oldest_req(mdsc))
2884 complete_all(&mdsc->safe_umount_waiters);
2885 mutex_unlock(&mdsc->mutex);
2889 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2890 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2891 if (req->r_unsafe_dir) {
2892 struct ceph_inode_info *ci =
2893 ceph_inode(req->r_unsafe_dir);
2894 spin_lock(&ci->i_unsafe_lock);
2895 list_add_tail(&req->r_unsafe_dir_item,
2896 &ci->i_unsafe_dirops);
2897 spin_unlock(&ci->i_unsafe_lock);
2901 dout("handle_reply tid %lld result %d\n", tid, result);
2902 rinfo = &req->r_reply_info;
2903 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
2904 err = parse_reply_info(msg, rinfo, (u64)-1);
2906 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2907 mutex_unlock(&mdsc->mutex);
2909 mutex_lock(&session->s_mutex);
2911 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2918 if (rinfo->snapblob_len) {
2919 down_write(&mdsc->snap_rwsem);
2920 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2921 rinfo->snapblob + rinfo->snapblob_len,
2922 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2924 downgrade_write(&mdsc->snap_rwsem);
2926 down_read(&mdsc->snap_rwsem);
2929 /* insert trace into our cache */
2930 mutex_lock(&req->r_fill_mutex);
2931 current->journal_info = req;
2932 err = ceph_fill_trace(mdsc->fsc->sb, req);
2934 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2935 req->r_op == CEPH_MDS_OP_LSSNAP))
2936 ceph_readdir_prepopulate(req, req->r_session);
2938 current->journal_info = NULL;
2939 mutex_unlock(&req->r_fill_mutex);
2941 up_read(&mdsc->snap_rwsem);
2943 ceph_put_snap_realm(mdsc, realm);
2946 if (req->r_target_inode &&
2947 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2948 struct ceph_inode_info *ci =
2949 ceph_inode(req->r_target_inode);
2950 spin_lock(&ci->i_unsafe_lock);
2951 list_add_tail(&req->r_unsafe_target_item,
2952 &ci->i_unsafe_iops);
2953 spin_unlock(&ci->i_unsafe_lock);
2956 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2959 mutex_lock(&mdsc->mutex);
2960 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2964 req->r_reply = ceph_msg_get(msg);
2965 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2968 dout("reply arrived after request %lld was aborted\n", tid);
2970 mutex_unlock(&mdsc->mutex);
2972 mutex_unlock(&session->s_mutex);
2974 /* kick calling process */
2975 complete_request(mdsc, req);
2977 ceph_mdsc_put_request(req);
2984 * handle mds notification that our request has been forwarded.
2986 static void handle_forward(struct ceph_mds_client *mdsc,
2987 struct ceph_mds_session *session,
2988 struct ceph_msg *msg)
2990 struct ceph_mds_request *req;
2991 u64 tid = le64_to_cpu(msg->hdr.tid);
2995 void *p = msg->front.iov_base;
2996 void *end = p + msg->front.iov_len;
2998 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2999 next_mds = ceph_decode_32(&p);
3000 fwd_seq = ceph_decode_32(&p);
3002 mutex_lock(&mdsc->mutex);
3003 req = lookup_get_request(mdsc, tid);
3005 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3006 goto out; /* dup reply? */
3009 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3010 dout("forward tid %llu aborted, unregistering\n", tid);
3011 __unregister_request(mdsc, req);
3012 } else if (fwd_seq <= req->r_num_fwd) {
3013 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3014 tid, next_mds, req->r_num_fwd, fwd_seq);
3016 /* resend. forward race not possible; mds would drop */
3017 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3019 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3020 req->r_attempts = 0;
3021 req->r_num_fwd = fwd_seq;
3022 req->r_resend_mds = next_mds;
3023 put_request_session(req);
3024 __do_request(mdsc, req);
3026 ceph_mdsc_put_request(req);
3028 mutex_unlock(&mdsc->mutex);
3032 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3035 static int __decode_session_metadata(void **p, void *end,
3038 /* map<string,string> */
3041 ceph_decode_32_safe(p, end, n, bad);
3044 ceph_decode_32_safe(p, end, len, bad);
3045 ceph_decode_need(p, end, len, bad);
3046 err_str = !strncmp(*p, "error_string", len);
3048 ceph_decode_32_safe(p, end, len, bad);
3049 ceph_decode_need(p, end, len, bad);
3050 if (err_str && strnstr(*p, "blacklisted", len))
3051 *blacklisted = true;
3060 * handle a mds session control message
3062 static void handle_session(struct ceph_mds_session *session,
3063 struct ceph_msg *msg)
3065 struct ceph_mds_client *mdsc = session->s_mdsc;
3066 int mds = session->s_mds;
3067 int msg_version = le16_to_cpu(msg->hdr.version);
3068 void *p = msg->front.iov_base;
3069 void *end = p + msg->front.iov_len;
3070 struct ceph_mds_session_head *h;
3073 unsigned long features = 0;
3075 bool blacklisted = false;
3078 ceph_decode_need(&p, end, sizeof(*h), bad);
3082 op = le32_to_cpu(h->op);
3083 seq = le64_to_cpu(h->seq);
3085 if (msg_version >= 3) {
3087 /* version >= 2, metadata */
3088 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
3090 /* version >= 3, feature bits */
3091 ceph_decode_32_safe(&p, end, len, bad);
3092 ceph_decode_need(&p, end, len, bad);
3093 memcpy(&features, p, min_t(size_t, len, sizeof(features)));
3097 mutex_lock(&mdsc->mutex);
3098 if (op == CEPH_SESSION_CLOSE) {
3099 get_session(session);
3100 __unregister_session(mdsc, session);
3102 /* FIXME: this ttl calculation is generous */
3103 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3104 mutex_unlock(&mdsc->mutex);
3106 mutex_lock(&session->s_mutex);
3108 dout("handle_session mds%d %s %p state %s seq %llu\n",
3109 mds, ceph_session_op_name(op), session,
3110 ceph_session_state_name(session->s_state), seq);
3112 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3113 session->s_state = CEPH_MDS_SESSION_OPEN;
3114 pr_info("mds%d came back\n", session->s_mds);
3118 case CEPH_SESSION_OPEN:
3119 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3120 pr_info("mds%d reconnect success\n", session->s_mds);
3121 session->s_state = CEPH_MDS_SESSION_OPEN;
3122 session->s_features = features;
3123 renewed_caps(mdsc, session, 0);
3126 __close_session(mdsc, session);
3129 case CEPH_SESSION_RENEWCAPS:
3130 if (session->s_renew_seq == seq)
3131 renewed_caps(mdsc, session, 1);
3134 case CEPH_SESSION_CLOSE:
3135 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3136 pr_info("mds%d reconnect denied\n", session->s_mds);
3137 cleanup_session_requests(mdsc, session);
3138 remove_session_caps(session);
3139 wake = 2; /* for good measure */
3140 wake_up_all(&mdsc->session_close_wq);
3143 case CEPH_SESSION_STALE:
3144 pr_info("mds%d caps went stale, renewing\n",
3146 spin_lock(&session->s_gen_ttl_lock);
3147 session->s_cap_gen++;
3148 session->s_cap_ttl = jiffies - 1;
3149 spin_unlock(&session->s_gen_ttl_lock);
3150 send_renew_caps(mdsc, session);
3153 case CEPH_SESSION_RECALL_STATE:
3154 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3157 case CEPH_SESSION_FLUSHMSG:
3158 send_flushmsg_ack(mdsc, session, seq);
3161 case CEPH_SESSION_FORCE_RO:
3162 dout("force_session_readonly %p\n", session);
3163 spin_lock(&session->s_cap_lock);
3164 session->s_readonly = true;
3165 spin_unlock(&session->s_cap_lock);
3166 wake_up_session_caps(session, FORCE_RO);
3169 case CEPH_SESSION_REJECT:
3170 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3171 pr_info("mds%d rejected session\n", session->s_mds);
3172 session->s_state = CEPH_MDS_SESSION_REJECTED;
3173 cleanup_session_requests(mdsc, session);
3174 remove_session_caps(session);
3176 mdsc->fsc->blacklisted = true;
3177 wake = 2; /* for good measure */
3181 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3185 mutex_unlock(&session->s_mutex);
3187 mutex_lock(&mdsc->mutex);
3188 __wake_requests(mdsc, &session->s_waiting);
3190 kick_requests(mdsc, mds);
3191 mutex_unlock(&mdsc->mutex);
3193 if (op == CEPH_SESSION_CLOSE)
3194 ceph_put_mds_session(session);
3198 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3199 (int)msg->front.iov_len);
3206 * called under session->mutex.
3208 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3209 struct ceph_mds_session *session)
3211 struct ceph_mds_request *req, *nreq;
3215 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3217 mutex_lock(&mdsc->mutex);
3218 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
3219 err = __prepare_send_request(mdsc, req, session->s_mds, true);
3221 ceph_msg_get(req->r_request);
3222 ceph_con_send(&session->s_con, req->r_request);
3227 * also re-send old requests when MDS enters reconnect stage. So that MDS
3228 * can process completed request in clientreplay stage.
3230 p = rb_first(&mdsc->request_tree);
3232 req = rb_entry(p, struct ceph_mds_request, r_node);
3234 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3236 if (req->r_attempts == 0)
3237 continue; /* only old requests */
3238 if (req->r_session &&
3239 req->r_session->s_mds == session->s_mds) {
3240 err = __prepare_send_request(mdsc, req,
3241 session->s_mds, true);
3243 ceph_msg_get(req->r_request);
3244 ceph_con_send(&session->s_con, req->r_request);
3248 mutex_unlock(&mdsc->mutex);
3251 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3253 struct ceph_msg *reply;
3254 struct ceph_pagelist *_pagelist;
3259 if (!recon_state->allow_multi)
3262 /* can't handle message that contains both caps and realm */
3263 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3265 /* pre-allocate new pagelist */
3266 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3270 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3274 /* placeholder for nr_caps */
3275 err = ceph_pagelist_encode_32(_pagelist, 0);
3279 if (recon_state->nr_caps) {
3280 /* currently encoding caps */
3281 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3285 /* placeholder for nr_realms (currently encoding relams) */
3286 err = ceph_pagelist_encode_32(_pagelist, 0);
3291 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3295 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3296 addr = kmap_atomic(page);
3297 if (recon_state->nr_caps) {
3298 /* currently encoding caps */
3299 *addr = cpu_to_le32(recon_state->nr_caps);
3301 /* currently encoding relams */
3302 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3304 kunmap_atomic(addr);
3306 reply->hdr.version = cpu_to_le16(5);
3307 reply->hdr.compat_version = cpu_to_le16(4);
3309 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3310 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3312 ceph_con_send(&recon_state->session->s_con, reply);
3313 ceph_pagelist_release(recon_state->pagelist);
3315 recon_state->pagelist = _pagelist;
3316 recon_state->nr_caps = 0;
3317 recon_state->nr_realms = 0;
3318 recon_state->msg_version = 5;
3321 ceph_msg_put(reply);
3323 ceph_pagelist_release(_pagelist);
3328 * Encode information about a cap for a reconnect with the MDS.
3330 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
3334 struct ceph_mds_cap_reconnect v2;
3335 struct ceph_mds_cap_reconnect_v1 v1;
3337 struct ceph_inode_info *ci = cap->ci;
3338 struct ceph_reconnect_state *recon_state = arg;
3339 struct ceph_pagelist *pagelist = recon_state->pagelist;
3343 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3344 inode, ceph_vinop(inode), cap, cap->cap_id,
3345 ceph_cap_string(cap->issued));
3347 spin_lock(&ci->i_ceph_lock);
3348 cap->seq = 0; /* reset cap seq */
3349 cap->issue_seq = 0; /* and issue_seq */
3350 cap->mseq = 0; /* and migrate_seq */
3351 cap->cap_gen = cap->session->s_cap_gen;
3353 if (recon_state->msg_version >= 2) {
3354 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3355 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3356 rec.v2.issued = cpu_to_le32(cap->issued);
3357 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3358 rec.v2.pathbase = 0;
3359 rec.v2.flock_len = (__force __le32)
3360 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3362 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3363 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3364 rec.v1.issued = cpu_to_le32(cap->issued);
3365 rec.v1.size = cpu_to_le64(inode->i_size);
3366 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3367 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3368 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3369 rec.v1.pathbase = 0;
3372 if (list_empty(&ci->i_cap_snaps)) {
3373 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3375 struct ceph_cap_snap *capsnap =
3376 list_first_entry(&ci->i_cap_snaps,
3377 struct ceph_cap_snap, ci_item);
3378 snap_follows = capsnap->follows;
3380 spin_unlock(&ci->i_ceph_lock);
3382 if (recon_state->msg_version >= 2) {
3383 int num_fcntl_locks, num_flock_locks;
3384 struct ceph_filelock *flocks = NULL;
3385 size_t struct_len, total_len = sizeof(u64);
3389 if (rec.v2.flock_len) {
3390 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3392 num_fcntl_locks = 0;
3393 num_flock_locks = 0;
3395 if (num_fcntl_locks + num_flock_locks > 0) {
3396 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3397 sizeof(struct ceph_filelock),
3403 err = ceph_encode_locks_to_buffer(inode, flocks,
3418 if (recon_state->msg_version >= 3) {
3419 /* version, compat_version and struct_len */
3420 total_len += 2 * sizeof(u8) + sizeof(u32);
3424 * number of encoded locks is stable, so copy to pagelist
3426 struct_len = 2 * sizeof(u32) +
3427 (num_fcntl_locks + num_flock_locks) *
3428 sizeof(struct ceph_filelock);
3429 rec.v2.flock_len = cpu_to_le32(struct_len);
3431 struct_len += sizeof(u32) + sizeof(rec.v2);
3434 struct_len += sizeof(u64); /* snap_follows */
3436 total_len += struct_len;
3438 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3439 err = send_reconnect_partial(recon_state);
3441 goto out_freeflocks;
3442 pagelist = recon_state->pagelist;
3445 err = ceph_pagelist_reserve(pagelist, total_len);
3447 goto out_freeflocks;
3449 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3450 if (recon_state->msg_version >= 3) {
3451 ceph_pagelist_encode_8(pagelist, struct_v);
3452 ceph_pagelist_encode_8(pagelist, 1);
3453 ceph_pagelist_encode_32(pagelist, struct_len);
3455 ceph_pagelist_encode_string(pagelist, NULL, 0);
3456 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3457 ceph_locks_to_pagelist(flocks, pagelist,
3458 num_fcntl_locks, num_flock_locks);
3460 ceph_pagelist_encode_64(pagelist, snap_follows);
3467 struct dentry *dentry;
3469 dentry = d_find_alias(inode);
3471 path = ceph_mdsc_build_path(dentry,
3472 &pathlen, &pathbase, 0);
3475 err = PTR_ERR(path);
3478 rec.v1.pathbase = cpu_to_le64(pathbase);
3481 err = ceph_pagelist_reserve(pagelist,
3482 sizeof(u64) + sizeof(u32) +
3483 pathlen + sizeof(rec.v1));
3488 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3489 ceph_pagelist_encode_string(pagelist, path, pathlen);
3490 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3492 ceph_mdsc_free_path(path, pathlen);
3497 recon_state->nr_caps++;
3501 static int encode_snap_realms(struct ceph_mds_client *mdsc,
3502 struct ceph_reconnect_state *recon_state)
3505 struct ceph_pagelist *pagelist = recon_state->pagelist;
3508 if (recon_state->msg_version >= 4) {
3509 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3515 * snaprealms. we provide mds with the ino, seq (version), and
3516 * parent for all of our realms. If the mds has any newer info,
3519 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3520 struct ceph_snap_realm *realm =
3521 rb_entry(p, struct ceph_snap_realm, node);
3522 struct ceph_mds_snaprealm_reconnect sr_rec;
3524 if (recon_state->msg_version >= 4) {
3525 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3528 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3529 err = send_reconnect_partial(recon_state);
3532 pagelist = recon_state->pagelist;
3535 err = ceph_pagelist_reserve(pagelist, need);
3539 ceph_pagelist_encode_8(pagelist, 1);
3540 ceph_pagelist_encode_8(pagelist, 1);
3541 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3544 dout(" adding snap realm %llx seq %lld parent %llx\n",
3545 realm->ino, realm->seq, realm->parent_ino);
3546 sr_rec.ino = cpu_to_le64(realm->ino);
3547 sr_rec.seq = cpu_to_le64(realm->seq);
3548 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3550 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3554 recon_state->nr_realms++;
3562 * If an MDS fails and recovers, clients need to reconnect in order to
3563 * reestablish shared state. This includes all caps issued through
3564 * this session _and_ the snap_realm hierarchy. Because it's not
3565 * clear which snap realms the mds cares about, we send everything we
3566 * know about.. that ensures we'll then get any new info the
3567 * recovering MDS might have.
3569 * This is a relatively heavyweight operation, but it's rare.
3571 * called with mdsc->mutex held.
3573 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3574 struct ceph_mds_session *session)
3576 struct ceph_msg *reply;
3577 int mds = session->s_mds;
3579 struct ceph_reconnect_state recon_state = {
3584 pr_info("mds%d reconnect start\n", mds);
3586 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3587 if (!recon_state.pagelist)
3588 goto fail_nopagelist;
3590 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3594 mutex_lock(&session->s_mutex);
3595 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3598 dout("session %p state %s\n", session,
3599 ceph_session_state_name(session->s_state));
3601 spin_lock(&session->s_gen_ttl_lock);
3602 session->s_cap_gen++;
3603 spin_unlock(&session->s_gen_ttl_lock);
3605 spin_lock(&session->s_cap_lock);
3606 /* don't know if session is readonly */
3607 session->s_readonly = 0;
3609 * notify __ceph_remove_cap() that we are composing cap reconnect.
3610 * If a cap get released before being added to the cap reconnect,
3611 * __ceph_remove_cap() should skip queuing cap release.
3613 session->s_cap_reconnect = 1;
3614 /* drop old cap expires; we're about to reestablish that state */
3615 detach_cap_releases(session, &dispose);
3616 spin_unlock(&session->s_cap_lock);
3617 dispose_cap_releases(mdsc, &dispose);
3619 /* trim unused caps to reduce MDS's cache rejoin time */
3620 if (mdsc->fsc->sb->s_root)
3621 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3623 ceph_con_close(&session->s_con);
3624 ceph_con_open(&session->s_con,
3625 CEPH_ENTITY_TYPE_MDS, mds,
3626 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3628 /* replay unsafe requests */
3629 replay_unsafe_requests(mdsc, session);
3631 ceph_early_kick_flushing_caps(mdsc, session);
3633 down_read(&mdsc->snap_rwsem);
3635 /* placeholder for nr_caps */
3636 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
3640 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
3641 recon_state.msg_version = 3;
3642 recon_state.allow_multi = true;
3643 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3644 recon_state.msg_version = 3;
3646 recon_state.msg_version = 2;
3648 /* trsaverse this session's caps */
3649 err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
3651 spin_lock(&session->s_cap_lock);
3652 session->s_cap_reconnect = 0;
3653 spin_unlock(&session->s_cap_lock);
3658 /* check if all realms can be encoded into current message */
3659 if (mdsc->num_snap_realms) {
3661 recon_state.pagelist->length +
3662 mdsc->num_snap_realms *
3663 sizeof(struct ceph_mds_snaprealm_reconnect);
3664 if (recon_state.msg_version >= 4) {
3665 /* number of realms */
3666 total_len += sizeof(u32);
3667 /* version, compat_version and struct_len */
3668 total_len += mdsc->num_snap_realms *
3669 (2 * sizeof(u8) + sizeof(u32));
3671 if (total_len > RECONNECT_MAX_SIZE) {
3672 if (!recon_state.allow_multi) {
3676 if (recon_state.nr_caps) {
3677 err = send_reconnect_partial(&recon_state);
3681 recon_state.msg_version = 5;
3685 err = encode_snap_realms(mdsc, &recon_state);
3689 if (recon_state.msg_version >= 5) {
3690 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3695 if (recon_state.nr_caps || recon_state.nr_realms) {
3697 list_first_entry(&recon_state.pagelist->head,
3699 __le32 *addr = kmap_atomic(page);
3700 if (recon_state.nr_caps) {
3701 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3702 *addr = cpu_to_le32(recon_state.nr_caps);
3703 } else if (recon_state.msg_version >= 4) {
3704 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3706 kunmap_atomic(addr);
3709 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3710 if (recon_state.msg_version >= 4)
3711 reply->hdr.compat_version = cpu_to_le16(4);
3713 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3714 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
3716 ceph_con_send(&session->s_con, reply);
3718 mutex_unlock(&session->s_mutex);
3720 mutex_lock(&mdsc->mutex);
3721 __wake_requests(mdsc, &session->s_waiting);
3722 mutex_unlock(&mdsc->mutex);
3724 up_read(&mdsc->snap_rwsem);
3725 ceph_pagelist_release(recon_state.pagelist);
3729 ceph_msg_put(reply);
3730 up_read(&mdsc->snap_rwsem);
3731 mutex_unlock(&session->s_mutex);
3733 ceph_pagelist_release(recon_state.pagelist);
3735 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3741 * compare old and new mdsmaps, kicking requests
3742 * and closing out old connections as necessary
3744 * called under mdsc->mutex.
3746 static void check_new_map(struct ceph_mds_client *mdsc,
3747 struct ceph_mdsmap *newmap,
3748 struct ceph_mdsmap *oldmap)
3751 int oldstate, newstate;
3752 struct ceph_mds_session *s;
3754 dout("check_new_map new %u old %u\n",
3755 newmap->m_epoch, oldmap->m_epoch);
3757 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3758 if (!mdsc->sessions[i])
3760 s = mdsc->sessions[i];
3761 oldstate = ceph_mdsmap_get_state(oldmap, i);
3762 newstate = ceph_mdsmap_get_state(newmap, i);
3764 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3765 i, ceph_mds_state_name(oldstate),
3766 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3767 ceph_mds_state_name(newstate),
3768 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3769 ceph_session_state_name(s->s_state));
3771 if (i >= newmap->m_num_mds) {
3772 /* force close session for stopped mds */
3774 __unregister_session(mdsc, s);
3775 __wake_requests(mdsc, &s->s_waiting);
3776 mutex_unlock(&mdsc->mutex);
3778 mutex_lock(&s->s_mutex);
3779 cleanup_session_requests(mdsc, s);
3780 remove_session_caps(s);
3781 mutex_unlock(&s->s_mutex);
3783 ceph_put_mds_session(s);
3785 mutex_lock(&mdsc->mutex);
3786 kick_requests(mdsc, i);
3790 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
3791 ceph_mdsmap_get_addr(newmap, i),
3792 sizeof(struct ceph_entity_addr))) {
3794 mutex_unlock(&mdsc->mutex);
3795 mutex_lock(&s->s_mutex);
3796 mutex_lock(&mdsc->mutex);
3797 ceph_con_close(&s->s_con);
3798 mutex_unlock(&s->s_mutex);
3799 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3800 } else if (oldstate == newstate) {
3801 continue; /* nothing new with this mds */
3807 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3808 newstate >= CEPH_MDS_STATE_RECONNECT) {
3809 mutex_unlock(&mdsc->mutex);
3810 send_mds_reconnect(mdsc, s);
3811 mutex_lock(&mdsc->mutex);
3815 * kick request on any mds that has gone active.
3817 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3818 newstate >= CEPH_MDS_STATE_ACTIVE) {
3819 if (oldstate != CEPH_MDS_STATE_CREATING &&
3820 oldstate != CEPH_MDS_STATE_STARTING)
3821 pr_info("mds%d recovery completed\n", s->s_mds);
3822 kick_requests(mdsc, i);
3823 ceph_kick_flushing_caps(mdsc, s);
3824 wake_up_session_caps(s, RECONNECT);
3828 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3829 s = mdsc->sessions[i];
3832 if (!ceph_mdsmap_is_laggy(newmap, i))
3834 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3835 s->s_state == CEPH_MDS_SESSION_HUNG ||
3836 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3837 dout(" connecting to export targets of laggy mds%d\n",
3839 __open_export_target_sessions(mdsc, s);
3851 * caller must hold session s_mutex, dentry->d_lock
3853 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3855 struct ceph_dentry_info *di = ceph_dentry(dentry);
3857 ceph_put_mds_session(di->lease_session);
3858 di->lease_session = NULL;
3861 static void handle_lease(struct ceph_mds_client *mdsc,
3862 struct ceph_mds_session *session,
3863 struct ceph_msg *msg)
3865 struct super_block *sb = mdsc->fsc->sb;
3866 struct inode *inode;
3867 struct dentry *parent, *dentry;
3868 struct ceph_dentry_info *di;
3869 int mds = session->s_mds;
3870 struct ceph_mds_lease *h = msg->front.iov_base;
3872 struct ceph_vino vino;
3876 dout("handle_lease from mds%d\n", mds);
3879 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3881 vino.ino = le64_to_cpu(h->ino);
3882 vino.snap = CEPH_NOSNAP;
3883 seq = le32_to_cpu(h->seq);
3884 dname.len = get_unaligned_le32(h + 1);
3885 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
3887 dname.name = (void *)(h + 1) + sizeof(u32);
3890 inode = ceph_find_inode(sb, vino);
3891 dout("handle_lease %s, ino %llx %p %.*s\n",
3892 ceph_lease_op_name(h->action), vino.ino, inode,
3893 dname.len, dname.name);
3895 mutex_lock(&session->s_mutex);
3899 dout("handle_lease no inode %llx\n", vino.ino);
3904 parent = d_find_alias(inode);
3906 dout("no parent dentry on inode %p\n", inode);
3908 goto release; /* hrm... */
3910 dname.hash = full_name_hash(parent, dname.name, dname.len);
3911 dentry = d_lookup(parent, &dname);
3916 spin_lock(&dentry->d_lock);
3917 di = ceph_dentry(dentry);
3918 switch (h->action) {
3919 case CEPH_MDS_LEASE_REVOKE:
3920 if (di->lease_session == session) {
3921 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3922 h->seq = cpu_to_le32(di->lease_seq);
3923 __ceph_mdsc_drop_dentry_lease(dentry);
3928 case CEPH_MDS_LEASE_RENEW:
3929 if (di->lease_session == session &&
3930 di->lease_gen == session->s_cap_gen &&
3931 di->lease_renew_from &&
3932 di->lease_renew_after == 0) {
3933 unsigned long duration =
3934 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3936 di->lease_seq = seq;
3937 di->time = di->lease_renew_from + duration;
3938 di->lease_renew_after = di->lease_renew_from +
3940 di->lease_renew_from = 0;
3944 spin_unlock(&dentry->d_lock);
3951 /* let's just reuse the same message */
3952 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3954 ceph_con_send(&session->s_con, msg);
3957 mutex_unlock(&session->s_mutex);
3958 /* avoid calling iput_final() in mds dispatch threads */
3959 ceph_async_iput(inode);
3963 pr_err("corrupt lease message\n");
3967 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3968 struct dentry *dentry, char action,
3971 struct ceph_msg *msg;
3972 struct ceph_mds_lease *lease;
3974 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
3976 dout("lease_send_msg identry %p %s to mds%d\n",
3977 dentry, ceph_lease_op_name(action), session->s_mds);
3979 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3982 lease = msg->front.iov_base;
3983 lease->action = action;
3984 lease->seq = cpu_to_le32(seq);
3986 spin_lock(&dentry->d_lock);
3987 dir = d_inode(dentry->d_parent);
3988 lease->ino = cpu_to_le64(ceph_ino(dir));
3989 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
3991 put_unaligned_le32(dentry->d_name.len, lease + 1);
3992 memcpy((void *)(lease + 1) + 4,
3993 dentry->d_name.name, dentry->d_name.len);
3994 spin_unlock(&dentry->d_lock);
3996 * if this is a preemptive lease RELEASE, no need to
3997 * flush request stream, since the actual request will
4000 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4002 ceph_con_send(&session->s_con, msg);
4006 * lock unlock sessions, to wait ongoing session activities
4008 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4012 mutex_lock(&mdsc->mutex);
4013 for (i = 0; i < mdsc->max_sessions; i++) {
4014 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4017 mutex_unlock(&mdsc->mutex);
4018 mutex_lock(&s->s_mutex);
4019 mutex_unlock(&s->s_mutex);
4020 ceph_put_mds_session(s);
4021 mutex_lock(&mdsc->mutex);
4023 mutex_unlock(&mdsc->mutex);
4026 static void maybe_recover_session(struct ceph_mds_client *mdsc)
4028 struct ceph_fs_client *fsc = mdsc->fsc;
4030 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4033 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4036 if (!READ_ONCE(fsc->blacklisted))
4039 if (fsc->last_auto_reconnect &&
4040 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4043 pr_info("auto reconnect after blacklisted\n");
4044 fsc->last_auto_reconnect = jiffies;
4045 ceph_force_reconnect(fsc->sb);
4049 * delayed work -- periodically trim expired leases, renew caps with mds
4051 static void schedule_delayed(struct ceph_mds_client *mdsc)
4054 unsigned hz = round_jiffies_relative(HZ * delay);
4055 schedule_delayed_work(&mdsc->delayed_work, hz);
4058 static void delayed_work(struct work_struct *work)
4061 struct ceph_mds_client *mdsc =
4062 container_of(work, struct ceph_mds_client, delayed_work.work);
4066 dout("mdsc delayed_work\n");
4068 mutex_lock(&mdsc->mutex);
4069 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4070 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4071 mdsc->last_renew_caps);
4073 mdsc->last_renew_caps = jiffies;
4075 for (i = 0; i < mdsc->max_sessions; i++) {
4076 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4079 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4080 dout("resending session close request for mds%d\n",
4082 request_close_session(mdsc, s);
4083 ceph_put_mds_session(s);
4086 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4087 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4088 s->s_state = CEPH_MDS_SESSION_HUNG;
4089 pr_info("mds%d hung\n", s->s_mds);
4092 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4093 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4094 s->s_state == CEPH_MDS_SESSION_REJECTED) {
4095 /* this mds is failed or recovering, just wait */
4096 ceph_put_mds_session(s);
4099 mutex_unlock(&mdsc->mutex);
4101 mutex_lock(&s->s_mutex);
4103 send_renew_caps(mdsc, s);
4105 ceph_con_keepalive(&s->s_con);
4106 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4107 s->s_state == CEPH_MDS_SESSION_HUNG)
4108 ceph_send_cap_releases(mdsc, s);
4109 mutex_unlock(&s->s_mutex);
4110 ceph_put_mds_session(s);
4112 mutex_lock(&mdsc->mutex);
4114 mutex_unlock(&mdsc->mutex);
4116 ceph_check_delayed_caps(mdsc);
4118 ceph_queue_cap_reclaim_work(mdsc);
4120 ceph_trim_snapid_map(mdsc);
4122 maybe_recover_session(mdsc);
4124 schedule_delayed(mdsc);
4127 int ceph_mdsc_init(struct ceph_fs_client *fsc)
4130 struct ceph_mds_client *mdsc;
4132 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4136 mutex_init(&mdsc->mutex);
4137 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4138 if (!mdsc->mdsmap) {
4144 init_completion(&mdsc->safe_umount_waiters);
4145 init_waitqueue_head(&mdsc->session_close_wq);
4146 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4147 mdsc->sessions = NULL;
4148 atomic_set(&mdsc->num_sessions, 0);
4149 mdsc->max_sessions = 0;
4151 atomic64_set(&mdsc->quotarealms_count, 0);
4152 mdsc->quotarealms_inodes = RB_ROOT;
4153 mutex_init(&mdsc->quotarealms_inodes_mutex);
4154 mdsc->last_snap_seq = 0;
4155 init_rwsem(&mdsc->snap_rwsem);
4156 mdsc->snap_realms = RB_ROOT;
4157 INIT_LIST_HEAD(&mdsc->snap_empty);
4158 mdsc->num_snap_realms = 0;
4159 spin_lock_init(&mdsc->snap_empty_lock);
4161 mdsc->oldest_tid = 0;
4162 mdsc->request_tree = RB_ROOT;
4163 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4164 mdsc->last_renew_caps = jiffies;
4165 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4166 spin_lock_init(&mdsc->cap_delay_lock);
4167 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4168 spin_lock_init(&mdsc->snap_flush_lock);
4169 mdsc->last_cap_flush_tid = 1;
4170 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4171 INIT_LIST_HEAD(&mdsc->cap_dirty);
4172 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4173 mdsc->num_cap_flushing = 0;
4174 spin_lock_init(&mdsc->cap_dirty_lock);
4175 init_waitqueue_head(&mdsc->cap_flushing_wq);
4176 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4177 atomic_set(&mdsc->cap_reclaim_pending, 0);
4179 spin_lock_init(&mdsc->dentry_list_lock);
4180 INIT_LIST_HEAD(&mdsc->dentry_leases);
4181 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4183 ceph_caps_init(mdsc);
4184 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4186 spin_lock_init(&mdsc->snapid_map_lock);
4187 mdsc->snapid_map_tree = RB_ROOT;
4188 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4190 init_rwsem(&mdsc->pool_perm_rwsem);
4191 mdsc->pool_perm_tree = RB_ROOT;
4193 strscpy(mdsc->nodename, utsname()->nodename,
4194 sizeof(mdsc->nodename));
4199 * Wait for safe replies on open mds requests. If we time out, drop
4200 * all requests from the tree to avoid dangling dentry refs.
4202 static void wait_requests(struct ceph_mds_client *mdsc)
4204 struct ceph_options *opts = mdsc->fsc->client->options;
4205 struct ceph_mds_request *req;
4207 mutex_lock(&mdsc->mutex);
4208 if (__get_oldest_req(mdsc)) {
4209 mutex_unlock(&mdsc->mutex);
4211 dout("wait_requests waiting for requests\n");
4212 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4213 ceph_timeout_jiffies(opts->mount_timeout));
4215 /* tear down remaining requests */
4216 mutex_lock(&mdsc->mutex);
4217 while ((req = __get_oldest_req(mdsc))) {
4218 dout("wait_requests timed out on tid %llu\n",
4220 list_del_init(&req->r_wait);
4221 __unregister_request(mdsc, req);
4224 mutex_unlock(&mdsc->mutex);
4225 dout("wait_requests done\n");
4229 * called before mount is ro, and before dentries are torn down.
4230 * (hmm, does this still race with new lookups?)
4232 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4234 dout("pre_umount\n");
4237 lock_unlock_sessions(mdsc);
4238 ceph_flush_dirty_caps(mdsc);
4239 wait_requests(mdsc);
4242 * wait for reply handlers to drop their request refs and
4243 * their inode/dcache refs
4247 ceph_cleanup_quotarealms_inodes(mdsc);
4251 * wait for all write mds requests to flush.
4253 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4255 struct ceph_mds_request *req = NULL, *nextreq;
4258 mutex_lock(&mdsc->mutex);
4259 dout("wait_unsafe_requests want %lld\n", want_tid);
4261 req = __get_oldest_req(mdsc);
4262 while (req && req->r_tid <= want_tid) {
4263 /* find next request */
4264 n = rb_next(&req->r_node);
4266 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4269 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4270 (req->r_op & CEPH_MDS_OP_WRITE)) {
4272 ceph_mdsc_get_request(req);
4274 ceph_mdsc_get_request(nextreq);
4275 mutex_unlock(&mdsc->mutex);
4276 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4277 req->r_tid, want_tid);
4278 wait_for_completion(&req->r_safe_completion);
4279 mutex_lock(&mdsc->mutex);
4280 ceph_mdsc_put_request(req);
4282 break; /* next dne before, so we're done! */
4283 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4284 /* next request was removed from tree */
4285 ceph_mdsc_put_request(nextreq);
4288 ceph_mdsc_put_request(nextreq); /* won't go away */
4292 mutex_unlock(&mdsc->mutex);
4293 dout("wait_unsafe_requests done\n");
4296 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4298 u64 want_tid, want_flush;
4300 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4304 mutex_lock(&mdsc->mutex);
4305 want_tid = mdsc->last_tid;
4306 mutex_unlock(&mdsc->mutex);
4308 ceph_flush_dirty_caps(mdsc);
4309 spin_lock(&mdsc->cap_dirty_lock);
4310 want_flush = mdsc->last_cap_flush_tid;
4311 if (!list_empty(&mdsc->cap_flush_list)) {
4312 struct ceph_cap_flush *cf =
4313 list_last_entry(&mdsc->cap_flush_list,
4314 struct ceph_cap_flush, g_list);
4317 spin_unlock(&mdsc->cap_dirty_lock);
4319 dout("sync want tid %lld flush_seq %lld\n",
4320 want_tid, want_flush);
4322 wait_unsafe_requests(mdsc, want_tid);
4323 wait_caps_flush(mdsc, want_flush);
4327 * true if all sessions are closed, or we force unmount
4329 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4331 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4333 return atomic_read(&mdsc->num_sessions) <= skipped;
4337 * called after sb is ro.
4339 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4341 struct ceph_options *opts = mdsc->fsc->client->options;
4342 struct ceph_mds_session *session;
4346 dout("close_sessions\n");
4348 /* close sessions */
4349 mutex_lock(&mdsc->mutex);
4350 for (i = 0; i < mdsc->max_sessions; i++) {
4351 session = __ceph_lookup_mds_session(mdsc, i);
4354 mutex_unlock(&mdsc->mutex);
4355 mutex_lock(&session->s_mutex);
4356 if (__close_session(mdsc, session) <= 0)
4358 mutex_unlock(&session->s_mutex);
4359 ceph_put_mds_session(session);
4360 mutex_lock(&mdsc->mutex);
4362 mutex_unlock(&mdsc->mutex);
4364 dout("waiting for sessions to close\n");
4365 wait_event_timeout(mdsc->session_close_wq,
4366 done_closing_sessions(mdsc, skipped),
4367 ceph_timeout_jiffies(opts->mount_timeout));
4369 /* tear down remaining sessions */
4370 mutex_lock(&mdsc->mutex);
4371 for (i = 0; i < mdsc->max_sessions; i++) {
4372 if (mdsc->sessions[i]) {
4373 session = get_session(mdsc->sessions[i]);
4374 __unregister_session(mdsc, session);
4375 mutex_unlock(&mdsc->mutex);
4376 mutex_lock(&session->s_mutex);
4377 remove_session_caps(session);
4378 mutex_unlock(&session->s_mutex);
4379 ceph_put_mds_session(session);
4380 mutex_lock(&mdsc->mutex);
4383 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4384 mutex_unlock(&mdsc->mutex);
4386 ceph_cleanup_snapid_map(mdsc);
4387 ceph_cleanup_empty_realms(mdsc);
4389 cancel_work_sync(&mdsc->cap_reclaim_work);
4390 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4395 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4397 struct ceph_mds_session *session;
4400 dout("force umount\n");
4402 mutex_lock(&mdsc->mutex);
4403 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4404 session = __ceph_lookup_mds_session(mdsc, mds);
4408 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4409 __unregister_session(mdsc, session);
4410 __wake_requests(mdsc, &session->s_waiting);
4411 mutex_unlock(&mdsc->mutex);
4413 mutex_lock(&session->s_mutex);
4414 __close_session(mdsc, session);
4415 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4416 cleanup_session_requests(mdsc, session);
4417 remove_session_caps(session);
4419 mutex_unlock(&session->s_mutex);
4420 ceph_put_mds_session(session);
4422 mutex_lock(&mdsc->mutex);
4423 kick_requests(mdsc, mds);
4425 __wake_requests(mdsc, &mdsc->waiting_for_map);
4426 mutex_unlock(&mdsc->mutex);
4429 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4432 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4434 ceph_mdsmap_destroy(mdsc->mdsmap);
4435 kfree(mdsc->sessions);
4436 ceph_caps_finalize(mdsc);
4437 ceph_pool_perm_destroy(mdsc);
4440 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4442 struct ceph_mds_client *mdsc = fsc->mdsc;
4443 dout("mdsc_destroy %p\n", mdsc);
4448 /* flush out any connection work with references to us */
4451 ceph_mdsc_stop(mdsc);
4455 dout("mdsc_destroy %p done\n", mdsc);
4458 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4460 struct ceph_fs_client *fsc = mdsc->fsc;
4461 const char *mds_namespace = fsc->mount_options->mds_namespace;
4462 void *p = msg->front.iov_base;
4463 void *end = p + msg->front.iov_len;
4467 u32 mount_fscid = (u32)-1;
4468 u8 struct_v, struct_cv;
4471 ceph_decode_need(&p, end, sizeof(u32), bad);
4472 epoch = ceph_decode_32(&p);
4474 dout("handle_fsmap epoch %u\n", epoch);
4476 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4477 struct_v = ceph_decode_8(&p);
4478 struct_cv = ceph_decode_8(&p);
4479 map_len = ceph_decode_32(&p);
4481 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4482 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4484 num_fs = ceph_decode_32(&p);
4485 while (num_fs-- > 0) {
4486 void *info_p, *info_end;
4491 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4492 info_v = ceph_decode_8(&p);
4493 info_cv = ceph_decode_8(&p);
4494 info_len = ceph_decode_32(&p);
4495 ceph_decode_need(&p, end, info_len, bad);
4497 info_end = p + info_len;
4500 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4501 fscid = ceph_decode_32(&info_p);
4502 namelen = ceph_decode_32(&info_p);
4503 ceph_decode_need(&info_p, info_end, namelen, bad);
4505 if (mds_namespace &&
4506 strlen(mds_namespace) == namelen &&
4507 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4508 mount_fscid = fscid;
4513 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4514 if (mount_fscid != (u32)-1) {
4515 fsc->client->monc.fs_cluster_id = mount_fscid;
4516 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4518 ceph_monc_renew_subs(&fsc->client->monc);
4526 pr_err("error decoding fsmap\n");
4528 mutex_lock(&mdsc->mutex);
4529 mdsc->mdsmap_err = err;
4530 __wake_requests(mdsc, &mdsc->waiting_for_map);
4531 mutex_unlock(&mdsc->mutex);
4535 * handle mds map update.
4537 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4541 void *p = msg->front.iov_base;
4542 void *end = p + msg->front.iov_len;
4543 struct ceph_mdsmap *newmap, *oldmap;
4544 struct ceph_fsid fsid;
4547 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4548 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4549 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4551 epoch = ceph_decode_32(&p);
4552 maplen = ceph_decode_32(&p);
4553 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4555 /* do we need it? */
4556 mutex_lock(&mdsc->mutex);
4557 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4558 dout("handle_map epoch %u <= our %u\n",
4559 epoch, mdsc->mdsmap->m_epoch);
4560 mutex_unlock(&mdsc->mutex);
4564 newmap = ceph_mdsmap_decode(&p, end);
4565 if (IS_ERR(newmap)) {
4566 err = PTR_ERR(newmap);
4570 /* swap into place */
4572 oldmap = mdsc->mdsmap;
4573 mdsc->mdsmap = newmap;
4574 check_new_map(mdsc, newmap, oldmap);
4575 ceph_mdsmap_destroy(oldmap);
4577 mdsc->mdsmap = newmap; /* first mds map */
4579 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4582 __wake_requests(mdsc, &mdsc->waiting_for_map);
4583 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4584 mdsc->mdsmap->m_epoch);
4586 mutex_unlock(&mdsc->mutex);
4587 schedule_delayed(mdsc);
4591 mutex_unlock(&mdsc->mutex);
4593 pr_err("error decoding mdsmap %d\n", err);
4597 static struct ceph_connection *con_get(struct ceph_connection *con)
4599 struct ceph_mds_session *s = con->private;
4601 if (get_session(s)) {
4602 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
4605 dout("mdsc con_get %p FAIL\n", s);
4609 static void con_put(struct ceph_connection *con)
4611 struct ceph_mds_session *s = con->private;
4613 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
4614 ceph_put_mds_session(s);
4618 * if the client is unresponsive for long enough, the mds will kill
4619 * the session entirely.
4621 static void peer_reset(struct ceph_connection *con)
4623 struct ceph_mds_session *s = con->private;
4624 struct ceph_mds_client *mdsc = s->s_mdsc;
4626 pr_warn("mds%d closed our session\n", s->s_mds);
4627 send_mds_reconnect(mdsc, s);
4630 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4632 struct ceph_mds_session *s = con->private;
4633 struct ceph_mds_client *mdsc = s->s_mdsc;
4634 int type = le16_to_cpu(msg->hdr.type);
4636 mutex_lock(&mdsc->mutex);
4637 if (__verify_registered_session(mdsc, s) < 0) {
4638 mutex_unlock(&mdsc->mutex);
4641 mutex_unlock(&mdsc->mutex);
4644 case CEPH_MSG_MDS_MAP:
4645 ceph_mdsc_handle_mdsmap(mdsc, msg);
4647 case CEPH_MSG_FS_MAP_USER:
4648 ceph_mdsc_handle_fsmap(mdsc, msg);
4650 case CEPH_MSG_CLIENT_SESSION:
4651 handle_session(s, msg);
4653 case CEPH_MSG_CLIENT_REPLY:
4654 handle_reply(s, msg);
4656 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4657 handle_forward(mdsc, s, msg);
4659 case CEPH_MSG_CLIENT_CAPS:
4660 ceph_handle_caps(s, msg);
4662 case CEPH_MSG_CLIENT_SNAP:
4663 ceph_handle_snap(mdsc, s, msg);
4665 case CEPH_MSG_CLIENT_LEASE:
4666 handle_lease(mdsc, s, msg);
4668 case CEPH_MSG_CLIENT_QUOTA:
4669 ceph_handle_quota(mdsc, s, msg);
4673 pr_err("received unknown message type %d %s\n", type,
4674 ceph_msg_type_name(type));
4685 * Note: returned pointer is the address of a structure that's
4686 * managed separately. Caller must *not* attempt to free it.
4688 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4689 int *proto, int force_new)
4691 struct ceph_mds_session *s = con->private;
4692 struct ceph_mds_client *mdsc = s->s_mdsc;
4693 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4694 struct ceph_auth_handshake *auth = &s->s_auth;
4696 if (force_new && auth->authorizer) {
4697 ceph_auth_destroy_authorizer(auth->authorizer);
4698 auth->authorizer = NULL;
4700 if (!auth->authorizer) {
4701 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4704 return ERR_PTR(ret);
4706 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4709 return ERR_PTR(ret);
4711 *proto = ac->protocol;
4716 static int add_authorizer_challenge(struct ceph_connection *con,
4717 void *challenge_buf, int challenge_buf_len)
4719 struct ceph_mds_session *s = con->private;
4720 struct ceph_mds_client *mdsc = s->s_mdsc;
4721 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4723 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4724 challenge_buf, challenge_buf_len);
4727 static int verify_authorizer_reply(struct ceph_connection *con)
4729 struct ceph_mds_session *s = con->private;
4730 struct ceph_mds_client *mdsc = s->s_mdsc;
4731 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4733 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4736 static int invalidate_authorizer(struct ceph_connection *con)
4738 struct ceph_mds_session *s = con->private;
4739 struct ceph_mds_client *mdsc = s->s_mdsc;
4740 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4742 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4744 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4747 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4748 struct ceph_msg_header *hdr, int *skip)
4750 struct ceph_msg *msg;
4751 int type = (int) le16_to_cpu(hdr->type);
4752 int front_len = (int) le32_to_cpu(hdr->front_len);
4758 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4760 pr_err("unable to allocate msg type %d len %d\n",
4768 static int mds_sign_message(struct ceph_msg *msg)
4770 struct ceph_mds_session *s = msg->con->private;
4771 struct ceph_auth_handshake *auth = &s->s_auth;
4773 return ceph_auth_sign_message(auth, msg);
4776 static int mds_check_message_signature(struct ceph_msg *msg)
4778 struct ceph_mds_session *s = msg->con->private;
4779 struct ceph_auth_handshake *auth = &s->s_auth;
4781 return ceph_auth_check_message_signature(auth, msg);
4784 static const struct ceph_connection_operations mds_con_ops = {
4787 .dispatch = dispatch,
4788 .get_authorizer = get_authorizer,
4789 .add_authorizer_challenge = add_authorizer_challenge,
4790 .verify_authorizer_reply = verify_authorizer_reply,
4791 .invalidate_authorizer = invalidate_authorizer,
4792 .peer_reset = peer_reset,
4793 .alloc_msg = mds_alloc_msg,
4794 .sign_message = mds_sign_message,
4795 .check_message_signature = mds_check_message_signature,