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47 * are no longer valid.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_parent);
715 ceph_async_iput(req->r_target_inode);
718 if (req->r_old_dentry)
719 dput(req->r_old_dentry);
720 if (req->r_old_dentry_dir) {
722 * track (and drop pins for) r_old_dentry_dir
723 * separately, since r_old_dentry's d_parent may have
724 * changed between the dir mutex being dropped and
725 * this request being freed.
727 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
729 ceph_async_iput(req->r_old_dentry_dir);
734 ceph_pagelist_release(req->r_pagelist);
735 put_request_session(req);
736 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
737 WARN_ON_ONCE(!list_empty(&req->r_wait));
741 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
744 * lookup session, bump ref if found.
746 * called under mdsc->mutex.
748 static struct ceph_mds_request *
749 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
751 struct ceph_mds_request *req;
753 req = lookup_request(&mdsc->request_tree, tid);
755 ceph_mdsc_get_request(req);
761 * Register an in-flight request, and assign a tid. Link to directory
762 * are modifying (if any).
764 * Called under mdsc->mutex.
766 static void __register_request(struct ceph_mds_client *mdsc,
767 struct ceph_mds_request *req,
772 req->r_tid = ++mdsc->last_tid;
773 if (req->r_num_caps) {
774 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
777 pr_err("__register_request %p "
778 "failed to reserve caps: %d\n", req, ret);
779 /* set req->r_err to fail early from __do_request */
784 dout("__register_request %p tid %lld\n", req, req->r_tid);
785 ceph_mdsc_get_request(req);
786 insert_request(&mdsc->request_tree, req);
788 req->r_uid = current_fsuid();
789 req->r_gid = current_fsgid();
791 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
792 mdsc->oldest_tid = req->r_tid;
796 req->r_unsafe_dir = dir;
800 static void __unregister_request(struct ceph_mds_client *mdsc,
801 struct ceph_mds_request *req)
803 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
805 /* Never leave an unregistered request on an unsafe list! */
806 list_del_init(&req->r_unsafe_item);
808 if (req->r_tid == mdsc->oldest_tid) {
809 struct rb_node *p = rb_next(&req->r_node);
810 mdsc->oldest_tid = 0;
812 struct ceph_mds_request *next_req =
813 rb_entry(p, struct ceph_mds_request, r_node);
814 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
815 mdsc->oldest_tid = next_req->r_tid;
822 erase_request(&mdsc->request_tree, req);
824 if (req->r_unsafe_dir &&
825 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
826 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
827 spin_lock(&ci->i_unsafe_lock);
828 list_del_init(&req->r_unsafe_dir_item);
829 spin_unlock(&ci->i_unsafe_lock);
831 if (req->r_target_inode &&
832 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
833 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
834 spin_lock(&ci->i_unsafe_lock);
835 list_del_init(&req->r_unsafe_target_item);
836 spin_unlock(&ci->i_unsafe_lock);
839 if (req->r_unsafe_dir) {
840 /* avoid calling iput_final() in mds dispatch threads */
841 ceph_async_iput(req->r_unsafe_dir);
842 req->r_unsafe_dir = NULL;
845 complete_all(&req->r_safe_completion);
847 ceph_mdsc_put_request(req);
851 * Walk back up the dentry tree until we hit a dentry representing a
852 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
853 * when calling this) to ensure that the objects won't disappear while we're
854 * working with them. Once we hit a candidate dentry, we attempt to take a
855 * reference to it, and return that as the result.
857 static struct inode *get_nonsnap_parent(struct dentry *dentry)
859 struct inode *inode = NULL;
861 while (dentry && !IS_ROOT(dentry)) {
862 inode = d_inode_rcu(dentry);
863 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
865 dentry = dentry->d_parent;
868 inode = igrab(inode);
873 * Choose mds to send request to next. If there is a hint set in the
874 * request (e.g., due to a prior forward hint from the mds), use that.
875 * Otherwise, consult frag tree and/or caps to identify the
876 * appropriate mds. If all else fails, choose randomly.
878 * Called under mdsc->mutex.
880 static int __choose_mds(struct ceph_mds_client *mdsc,
881 struct ceph_mds_request *req)
884 struct ceph_inode_info *ci;
885 struct ceph_cap *cap;
886 int mode = req->r_direct_mode;
888 u32 hash = req->r_direct_hash;
889 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
892 * is there a specific mds we should try? ignore hint if we have
893 * no session and the mds is not up (active or recovering).
895 if (req->r_resend_mds >= 0 &&
896 (__have_session(mdsc, req->r_resend_mds) ||
897 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
898 dout("choose_mds using resend_mds mds%d\n",
900 return req->r_resend_mds;
903 if (mode == USE_RANDOM_MDS)
908 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
909 inode = req->r_inode;
912 /* req->r_dentry is non-null for LSSNAP request */
914 inode = get_nonsnap_parent(req->r_dentry);
916 dout("__choose_mds using snapdir's parent %p\n", inode);
918 } else if (req->r_dentry) {
919 /* ignore race with rename; old or new d_parent is okay */
920 struct dentry *parent;
924 parent = READ_ONCE(req->r_dentry->d_parent);
925 dir = req->r_parent ? : d_inode_rcu(parent);
927 if (!dir || dir->i_sb != mdsc->fsc->sb) {
928 /* not this fs or parent went negative */
929 inode = d_inode(req->r_dentry);
932 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
933 /* direct snapped/virtual snapdir requests
934 * based on parent dir inode */
935 inode = get_nonsnap_parent(parent);
936 dout("__choose_mds using nonsnap parent %p\n", inode);
939 inode = d_inode(req->r_dentry);
940 if (!inode || mode == USE_AUTH_MDS) {
943 hash = ceph_dentry_hash(dir, req->r_dentry);
952 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
956 ci = ceph_inode(inode);
958 if (is_hash && S_ISDIR(inode->i_mode)) {
959 struct ceph_inode_frag frag;
962 ceph_choose_frag(ci, hash, &frag, &found);
964 if (mode == USE_ANY_MDS && frag.ndist > 0) {
967 /* choose a random replica */
968 get_random_bytes(&r, 1);
971 dout("choose_mds %p %llx.%llx "
972 "frag %u mds%d (%d/%d)\n",
973 inode, ceph_vinop(inode),
976 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
977 CEPH_MDS_STATE_ACTIVE)
981 /* since this file/dir wasn't known to be
982 * replicated, then we want to look for the
983 * authoritative mds. */
986 /* choose auth mds */
988 dout("choose_mds %p %llx.%llx "
989 "frag %u mds%d (auth)\n",
990 inode, ceph_vinop(inode), frag.frag, mds);
991 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
992 CEPH_MDS_STATE_ACTIVE)
998 spin_lock(&ci->i_ceph_lock);
1000 if (mode == USE_AUTH_MDS)
1001 cap = ci->i_auth_cap;
1002 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1003 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1005 spin_unlock(&ci->i_ceph_lock);
1006 ceph_async_iput(inode);
1009 mds = cap->session->s_mds;
1010 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
1011 inode, ceph_vinop(inode), mds,
1012 cap == ci->i_auth_cap ? "auth " : "", cap);
1013 spin_unlock(&ci->i_ceph_lock);
1015 /* avoid calling iput_final() while holding mdsc->mutex or
1016 * in mds dispatch threads */
1017 ceph_async_iput(inode);
1021 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1022 dout("choose_mds chose random mds%d\n", mds);
1030 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1032 struct ceph_msg *msg;
1033 struct ceph_mds_session_head *h;
1035 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1038 pr_err("create_session_msg ENOMEM creating msg\n");
1041 h = msg->front.iov_base;
1042 h->op = cpu_to_le32(op);
1043 h->seq = cpu_to_le64(seq);
1048 static void encode_supported_features(void **p, void *end)
1050 static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1051 static const size_t count = ARRAY_SIZE(bits);
1055 size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
1057 BUG_ON(*p + 4 + size > end);
1058 ceph_encode_32(p, size);
1059 memset(*p, 0, size);
1060 for (i = 0; i < count; i++)
1061 ((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
1064 BUG_ON(*p + 4 > end);
1065 ceph_encode_32(p, 0);
1070 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1071 * to include additional client metadata fields.
1073 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1075 struct ceph_msg *msg;
1076 struct ceph_mds_session_head *h;
1078 int extra_bytes = 0;
1079 int metadata_key_count = 0;
1080 struct ceph_options *opt = mdsc->fsc->client->options;
1081 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1084 const char* metadata[][2] = {
1085 {"hostname", mdsc->nodename},
1086 {"kernel_version", init_utsname()->release},
1087 {"entity_id", opt->name ? : ""},
1088 {"root", fsopt->server_path ? : "/"},
1092 /* Calculate serialized length of metadata */
1093 extra_bytes = 4; /* map length */
1094 for (i = 0; metadata[i][0]; ++i) {
1095 extra_bytes += 8 + strlen(metadata[i][0]) +
1096 strlen(metadata[i][1]);
1097 metadata_key_count++;
1099 /* supported feature */
1100 extra_bytes += 4 + 8;
1102 /* Allocate the message */
1103 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1106 pr_err("create_session_msg ENOMEM creating msg\n");
1109 p = msg->front.iov_base;
1110 end = p + msg->front.iov_len;
1113 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1114 h->seq = cpu_to_le64(seq);
1117 * Serialize client metadata into waiting buffer space, using
1118 * the format that userspace expects for map<string, string>
1120 * ClientSession messages with metadata are v2
1122 msg->hdr.version = cpu_to_le16(3);
1123 msg->hdr.compat_version = cpu_to_le16(1);
1125 /* The write pointer, following the session_head structure */
1128 /* Number of entries in the map */
1129 ceph_encode_32(&p, metadata_key_count);
1131 /* Two length-prefixed strings for each entry in the map */
1132 for (i = 0; metadata[i][0]; ++i) {
1133 size_t const key_len = strlen(metadata[i][0]);
1134 size_t const val_len = strlen(metadata[i][1]);
1136 ceph_encode_32(&p, key_len);
1137 memcpy(p, metadata[i][0], key_len);
1139 ceph_encode_32(&p, val_len);
1140 memcpy(p, metadata[i][1], val_len);
1144 encode_supported_features(&p, end);
1145 msg->front.iov_len = p - msg->front.iov_base;
1146 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1152 * send session open request.
1154 * called under mdsc->mutex
1156 static int __open_session(struct ceph_mds_client *mdsc,
1157 struct ceph_mds_session *session)
1159 struct ceph_msg *msg;
1161 int mds = session->s_mds;
1163 /* wait for mds to go active? */
1164 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1165 dout("open_session to mds%d (%s)\n", mds,
1166 ceph_mds_state_name(mstate));
1167 session->s_state = CEPH_MDS_SESSION_OPENING;
1168 session->s_renew_requested = jiffies;
1170 /* send connect message */
1171 msg = create_session_open_msg(mdsc, session->s_seq);
1174 ceph_con_send(&session->s_con, msg);
1179 * open sessions for any export targets for the given mds
1181 * called under mdsc->mutex
1183 static struct ceph_mds_session *
1184 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1186 struct ceph_mds_session *session;
1188 session = __ceph_lookup_mds_session(mdsc, target);
1190 session = register_session(mdsc, target);
1191 if (IS_ERR(session))
1194 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1195 session->s_state == CEPH_MDS_SESSION_CLOSING)
1196 __open_session(mdsc, session);
1201 struct ceph_mds_session *
1202 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1204 struct ceph_mds_session *session;
1206 dout("open_export_target_session to mds%d\n", target);
1208 mutex_lock(&mdsc->mutex);
1209 session = __open_export_target_session(mdsc, target);
1210 mutex_unlock(&mdsc->mutex);
1215 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1216 struct ceph_mds_session *session)
1218 struct ceph_mds_info *mi;
1219 struct ceph_mds_session *ts;
1220 int i, mds = session->s_mds;
1222 if (mds >= mdsc->mdsmap->m_num_mds)
1225 mi = &mdsc->mdsmap->m_info[mds];
1226 dout("open_export_target_sessions for mds%d (%d targets)\n",
1227 session->s_mds, mi->num_export_targets);
1229 for (i = 0; i < mi->num_export_targets; i++) {
1230 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1232 ceph_put_mds_session(ts);
1236 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1237 struct ceph_mds_session *session)
1239 mutex_lock(&mdsc->mutex);
1240 __open_export_target_sessions(mdsc, session);
1241 mutex_unlock(&mdsc->mutex);
1248 static void detach_cap_releases(struct ceph_mds_session *session,
1249 struct list_head *target)
1251 lockdep_assert_held(&session->s_cap_lock);
1253 list_splice_init(&session->s_cap_releases, target);
1254 session->s_num_cap_releases = 0;
1255 dout("dispose_cap_releases mds%d\n", session->s_mds);
1258 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1259 struct list_head *dispose)
1261 while (!list_empty(dispose)) {
1262 struct ceph_cap *cap;
1263 /* zero out the in-progress message */
1264 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1265 list_del(&cap->session_caps);
1266 ceph_put_cap(mdsc, cap);
1270 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1271 struct ceph_mds_session *session)
1273 struct ceph_mds_request *req;
1275 struct ceph_inode_info *ci;
1277 dout("cleanup_session_requests mds%d\n", session->s_mds);
1278 mutex_lock(&mdsc->mutex);
1279 while (!list_empty(&session->s_unsafe)) {
1280 req = list_first_entry(&session->s_unsafe,
1281 struct ceph_mds_request, r_unsafe_item);
1282 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1284 if (req->r_target_inode) {
1285 /* dropping unsafe change of inode's attributes */
1286 ci = ceph_inode(req->r_target_inode);
1287 errseq_set(&ci->i_meta_err, -EIO);
1289 if (req->r_unsafe_dir) {
1290 /* dropping unsafe directory operation */
1291 ci = ceph_inode(req->r_unsafe_dir);
1292 errseq_set(&ci->i_meta_err, -EIO);
1294 __unregister_request(mdsc, req);
1296 /* zero r_attempts, so kick_requests() will re-send requests */
1297 p = rb_first(&mdsc->request_tree);
1299 req = rb_entry(p, struct ceph_mds_request, r_node);
1301 if (req->r_session &&
1302 req->r_session->s_mds == session->s_mds)
1303 req->r_attempts = 0;
1305 mutex_unlock(&mdsc->mutex);
1309 * Helper to safely iterate over all caps associated with a session, with
1310 * special care taken to handle a racing __ceph_remove_cap().
1312 * Caller must hold session s_mutex.
1314 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1315 int (*cb)(struct inode *, struct ceph_cap *,
1318 struct list_head *p;
1319 struct ceph_cap *cap;
1320 struct inode *inode, *last_inode = NULL;
1321 struct ceph_cap *old_cap = NULL;
1324 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1325 spin_lock(&session->s_cap_lock);
1326 p = session->s_caps.next;
1327 while (p != &session->s_caps) {
1328 cap = list_entry(p, struct ceph_cap, session_caps);
1329 inode = igrab(&cap->ci->vfs_inode);
1334 session->s_cap_iterator = cap;
1335 spin_unlock(&session->s_cap_lock);
1338 /* avoid calling iput_final() while holding
1339 * s_mutex or in mds dispatch threads */
1340 ceph_async_iput(last_inode);
1344 ceph_put_cap(session->s_mdsc, old_cap);
1348 ret = cb(inode, cap, arg);
1351 spin_lock(&session->s_cap_lock);
1354 dout("iterate_session_caps finishing cap %p removal\n",
1356 BUG_ON(cap->session != session);
1357 cap->session = NULL;
1358 list_del_init(&cap->session_caps);
1359 session->s_nr_caps--;
1360 if (cap->queue_release)
1361 __ceph_queue_cap_release(session, cap);
1363 old_cap = cap; /* put_cap it w/o locks held */
1370 session->s_cap_iterator = NULL;
1371 spin_unlock(&session->s_cap_lock);
1373 ceph_async_iput(last_inode);
1375 ceph_put_cap(session->s_mdsc, old_cap);
1380 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1383 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1384 struct ceph_inode_info *ci = ceph_inode(inode);
1385 LIST_HEAD(to_remove);
1386 bool dirty_dropped = false;
1387 bool invalidate = false;
1389 dout("removing cap %p, ci is %p, inode is %p\n",
1390 cap, ci, &ci->vfs_inode);
1391 spin_lock(&ci->i_ceph_lock);
1392 if (cap->mds_wanted | cap->issued)
1393 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1394 __ceph_remove_cap(cap, false);
1395 if (!ci->i_auth_cap) {
1396 struct ceph_cap_flush *cf;
1397 struct ceph_mds_client *mdsc = fsc->mdsc;
1399 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1400 if (inode->i_data.nrpages > 0)
1402 if (ci->i_wrbuffer_ref > 0)
1403 mapping_set_error(&inode->i_data, -EIO);
1406 while (!list_empty(&ci->i_cap_flush_list)) {
1407 cf = list_first_entry(&ci->i_cap_flush_list,
1408 struct ceph_cap_flush, i_list);
1409 list_move(&cf->i_list, &to_remove);
1412 spin_lock(&mdsc->cap_dirty_lock);
1414 list_for_each_entry(cf, &to_remove, i_list)
1415 list_del(&cf->g_list);
1417 if (!list_empty(&ci->i_dirty_item)) {
1418 pr_warn_ratelimited(
1419 " dropping dirty %s state for %p %lld\n",
1420 ceph_cap_string(ci->i_dirty_caps),
1421 inode, ceph_ino(inode));
1422 ci->i_dirty_caps = 0;
1423 list_del_init(&ci->i_dirty_item);
1424 dirty_dropped = true;
1426 if (!list_empty(&ci->i_flushing_item)) {
1427 pr_warn_ratelimited(
1428 " dropping dirty+flushing %s state for %p %lld\n",
1429 ceph_cap_string(ci->i_flushing_caps),
1430 inode, ceph_ino(inode));
1431 ci->i_flushing_caps = 0;
1432 list_del_init(&ci->i_flushing_item);
1433 mdsc->num_cap_flushing--;
1434 dirty_dropped = true;
1436 spin_unlock(&mdsc->cap_dirty_lock);
1438 if (dirty_dropped) {
1439 errseq_set(&ci->i_meta_err, -EIO);
1441 if (ci->i_wrbuffer_ref_head == 0 &&
1442 ci->i_wr_ref == 0 &&
1443 ci->i_dirty_caps == 0 &&
1444 ci->i_flushing_caps == 0) {
1445 ceph_put_snap_context(ci->i_head_snapc);
1446 ci->i_head_snapc = NULL;
1450 if (atomic_read(&ci->i_filelock_ref) > 0) {
1451 /* make further file lock syscall return -EIO */
1452 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1453 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1454 inode, ceph_ino(inode));
1457 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1458 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1459 ci->i_prealloc_cap_flush = NULL;
1462 spin_unlock(&ci->i_ceph_lock);
1463 while (!list_empty(&to_remove)) {
1464 struct ceph_cap_flush *cf;
1465 cf = list_first_entry(&to_remove,
1466 struct ceph_cap_flush, i_list);
1467 list_del(&cf->i_list);
1468 ceph_free_cap_flush(cf);
1471 wake_up_all(&ci->i_cap_wq);
1473 ceph_queue_invalidate(inode);
1480 * caller must hold session s_mutex
1482 static void remove_session_caps(struct ceph_mds_session *session)
1484 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1485 struct super_block *sb = fsc->sb;
1488 dout("remove_session_caps on %p\n", session);
1489 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1491 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1493 spin_lock(&session->s_cap_lock);
1494 if (session->s_nr_caps > 0) {
1495 struct inode *inode;
1496 struct ceph_cap *cap, *prev = NULL;
1497 struct ceph_vino vino;
1499 * iterate_session_caps() skips inodes that are being
1500 * deleted, we need to wait until deletions are complete.
1501 * __wait_on_freeing_inode() is designed for the job,
1502 * but it is not exported, so use lookup inode function
1505 while (!list_empty(&session->s_caps)) {
1506 cap = list_entry(session->s_caps.next,
1507 struct ceph_cap, session_caps);
1511 vino = cap->ci->i_vino;
1512 spin_unlock(&session->s_cap_lock);
1514 inode = ceph_find_inode(sb, vino);
1515 /* avoid calling iput_final() while holding s_mutex */
1516 ceph_async_iput(inode);
1518 spin_lock(&session->s_cap_lock);
1522 // drop cap expires and unlock s_cap_lock
1523 detach_cap_releases(session, &dispose);
1525 BUG_ON(session->s_nr_caps > 0);
1526 BUG_ON(!list_empty(&session->s_cap_flushing));
1527 spin_unlock(&session->s_cap_lock);
1528 dispose_cap_releases(session->s_mdsc, &dispose);
1538 * wake up any threads waiting on this session's caps. if the cap is
1539 * old (didn't get renewed on the client reconnect), remove it now.
1541 * caller must hold s_mutex.
1543 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1546 struct ceph_inode_info *ci = ceph_inode(inode);
1547 unsigned long ev = (unsigned long)arg;
1549 if (ev == RECONNECT) {
1550 spin_lock(&ci->i_ceph_lock);
1551 ci->i_wanted_max_size = 0;
1552 ci->i_requested_max_size = 0;
1553 spin_unlock(&ci->i_ceph_lock);
1554 } else if (ev == RENEWCAPS) {
1555 if (cap->cap_gen < cap->session->s_cap_gen) {
1556 /* mds did not re-issue stale cap */
1557 spin_lock(&ci->i_ceph_lock);
1558 cap->issued = cap->implemented = CEPH_CAP_PIN;
1559 /* make sure mds knows what we want */
1560 if (__ceph_caps_file_wanted(ci) & ~cap->mds_wanted)
1561 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1562 spin_unlock(&ci->i_ceph_lock);
1564 } else if (ev == FORCE_RO) {
1566 wake_up_all(&ci->i_cap_wq);
1570 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1572 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1573 ceph_iterate_session_caps(session, wake_up_session_cb,
1574 (void *)(unsigned long)ev);
1578 * Send periodic message to MDS renewing all currently held caps. The
1579 * ack will reset the expiration for all caps from this session.
1581 * caller holds s_mutex
1583 static int send_renew_caps(struct ceph_mds_client *mdsc,
1584 struct ceph_mds_session *session)
1586 struct ceph_msg *msg;
1589 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1590 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1591 pr_info("mds%d caps stale\n", session->s_mds);
1592 session->s_renew_requested = jiffies;
1594 /* do not try to renew caps until a recovering mds has reconnected
1595 * with its clients. */
1596 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1597 if (state < CEPH_MDS_STATE_RECONNECT) {
1598 dout("send_renew_caps ignoring mds%d (%s)\n",
1599 session->s_mds, ceph_mds_state_name(state));
1603 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1604 ceph_mds_state_name(state));
1605 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1606 ++session->s_renew_seq);
1609 ceph_con_send(&session->s_con, msg);
1613 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1614 struct ceph_mds_session *session, u64 seq)
1616 struct ceph_msg *msg;
1618 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1619 session->s_mds, ceph_session_state_name(session->s_state), seq);
1620 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1623 ceph_con_send(&session->s_con, msg);
1629 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1631 * Called under session->s_mutex
1633 static void renewed_caps(struct ceph_mds_client *mdsc,
1634 struct ceph_mds_session *session, int is_renew)
1639 spin_lock(&session->s_cap_lock);
1640 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1642 session->s_cap_ttl = session->s_renew_requested +
1643 mdsc->mdsmap->m_session_timeout*HZ;
1646 if (time_before(jiffies, session->s_cap_ttl)) {
1647 pr_info("mds%d caps renewed\n", session->s_mds);
1650 pr_info("mds%d caps still stale\n", session->s_mds);
1653 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1654 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1655 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1656 spin_unlock(&session->s_cap_lock);
1659 wake_up_session_caps(session, RENEWCAPS);
1663 * send a session close request
1665 static int request_close_session(struct ceph_mds_client *mdsc,
1666 struct ceph_mds_session *session)
1668 struct ceph_msg *msg;
1670 dout("request_close_session mds%d state %s seq %lld\n",
1671 session->s_mds, ceph_session_state_name(session->s_state),
1673 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1676 ceph_con_send(&session->s_con, msg);
1681 * Called with s_mutex held.
1683 static int __close_session(struct ceph_mds_client *mdsc,
1684 struct ceph_mds_session *session)
1686 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1688 session->s_state = CEPH_MDS_SESSION_CLOSING;
1689 return request_close_session(mdsc, session);
1692 static bool drop_negative_children(struct dentry *dentry)
1694 struct dentry *child;
1695 bool all_negative = true;
1697 if (!d_is_dir(dentry))
1700 spin_lock(&dentry->d_lock);
1701 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1702 if (d_really_is_positive(child)) {
1703 all_negative = false;
1707 spin_unlock(&dentry->d_lock);
1710 shrink_dcache_parent(dentry);
1712 return all_negative;
1716 * Trim old(er) caps.
1718 * Because we can't cache an inode without one or more caps, we do
1719 * this indirectly: if a cap is unused, we prune its aliases, at which
1720 * point the inode will hopefully get dropped to.
1722 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1723 * memory pressure from the MDS, though, so it needn't be perfect.
1725 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1727 int *remaining = arg;
1728 struct ceph_inode_info *ci = ceph_inode(inode);
1729 int used, wanted, oissued, mine;
1731 if (*remaining <= 0)
1734 spin_lock(&ci->i_ceph_lock);
1735 mine = cap->issued | cap->implemented;
1736 used = __ceph_caps_used(ci);
1737 wanted = __ceph_caps_file_wanted(ci);
1738 oissued = __ceph_caps_issued_other(ci, cap);
1740 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1741 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1742 ceph_cap_string(used), ceph_cap_string(wanted));
1743 if (cap == ci->i_auth_cap) {
1744 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1745 !list_empty(&ci->i_cap_snaps))
1747 if ((used | wanted) & CEPH_CAP_ANY_WR)
1749 /* Note: it's possible that i_filelock_ref becomes non-zero
1750 * after dropping auth caps. It doesn't hurt because reply
1751 * of lock mds request will re-add auth caps. */
1752 if (atomic_read(&ci->i_filelock_ref) > 0)
1755 /* The inode has cached pages, but it's no longer used.
1756 * we can safely drop it */
1757 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1758 !(oissued & CEPH_CAP_FILE_CACHE)) {
1762 if ((used | wanted) & ~oissued & mine)
1763 goto out; /* we need these caps */
1766 /* we aren't the only cap.. just remove us */
1767 __ceph_remove_cap(cap, true);
1770 struct dentry *dentry;
1771 /* try dropping referring dentries */
1772 spin_unlock(&ci->i_ceph_lock);
1773 dentry = d_find_any_alias(inode);
1774 if (dentry && drop_negative_children(dentry)) {
1777 d_prune_aliases(inode);
1778 count = atomic_read(&inode->i_count);
1781 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1790 spin_unlock(&ci->i_ceph_lock);
1795 * Trim session cap count down to some max number.
1797 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1798 struct ceph_mds_session *session,
1801 int trim_caps = session->s_nr_caps - max_caps;
1803 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1804 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1805 if (trim_caps > 0) {
1806 int remaining = trim_caps;
1808 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
1809 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1810 session->s_mds, session->s_nr_caps, max_caps,
1811 trim_caps - remaining);
1814 ceph_flush_cap_releases(mdsc, session);
1818 static int check_caps_flush(struct ceph_mds_client *mdsc,
1823 spin_lock(&mdsc->cap_dirty_lock);
1824 if (!list_empty(&mdsc->cap_flush_list)) {
1825 struct ceph_cap_flush *cf =
1826 list_first_entry(&mdsc->cap_flush_list,
1827 struct ceph_cap_flush, g_list);
1828 if (cf->tid <= want_flush_tid) {
1829 dout("check_caps_flush still flushing tid "
1830 "%llu <= %llu\n", cf->tid, want_flush_tid);
1834 spin_unlock(&mdsc->cap_dirty_lock);
1839 * flush all dirty inode data to disk.
1841 * returns true if we've flushed through want_flush_tid
1843 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1846 dout("check_caps_flush want %llu\n", want_flush_tid);
1848 wait_event(mdsc->cap_flushing_wq,
1849 check_caps_flush(mdsc, want_flush_tid));
1851 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1855 * called under s_mutex
1857 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1858 struct ceph_mds_session *session)
1860 struct ceph_msg *msg = NULL;
1861 struct ceph_mds_cap_release *head;
1862 struct ceph_mds_cap_item *item;
1863 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1864 struct ceph_cap *cap;
1865 LIST_HEAD(tmp_list);
1866 int num_cap_releases;
1867 __le32 barrier, *cap_barrier;
1869 down_read(&osdc->lock);
1870 barrier = cpu_to_le32(osdc->epoch_barrier);
1871 up_read(&osdc->lock);
1873 spin_lock(&session->s_cap_lock);
1875 list_splice_init(&session->s_cap_releases, &tmp_list);
1876 num_cap_releases = session->s_num_cap_releases;
1877 session->s_num_cap_releases = 0;
1878 spin_unlock(&session->s_cap_lock);
1880 while (!list_empty(&tmp_list)) {
1882 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1883 PAGE_SIZE, GFP_NOFS, false);
1886 head = msg->front.iov_base;
1887 head->num = cpu_to_le32(0);
1888 msg->front.iov_len = sizeof(*head);
1890 msg->hdr.version = cpu_to_le16(2);
1891 msg->hdr.compat_version = cpu_to_le16(1);
1894 cap = list_first_entry(&tmp_list, struct ceph_cap,
1896 list_del(&cap->session_caps);
1899 head = msg->front.iov_base;
1900 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
1902 item = msg->front.iov_base + msg->front.iov_len;
1903 item->ino = cpu_to_le64(cap->cap_ino);
1904 item->cap_id = cpu_to_le64(cap->cap_id);
1905 item->migrate_seq = cpu_to_le32(cap->mseq);
1906 item->seq = cpu_to_le32(cap->issue_seq);
1907 msg->front.iov_len += sizeof(*item);
1909 ceph_put_cap(mdsc, cap);
1911 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1912 // Append cap_barrier field
1913 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1914 *cap_barrier = barrier;
1915 msg->front.iov_len += sizeof(*cap_barrier);
1917 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1918 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1919 ceph_con_send(&session->s_con, msg);
1924 BUG_ON(num_cap_releases != 0);
1926 spin_lock(&session->s_cap_lock);
1927 if (!list_empty(&session->s_cap_releases))
1929 spin_unlock(&session->s_cap_lock);
1932 // Append cap_barrier field
1933 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1934 *cap_barrier = barrier;
1935 msg->front.iov_len += sizeof(*cap_barrier);
1937 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1938 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1939 ceph_con_send(&session->s_con, msg);
1943 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1945 spin_lock(&session->s_cap_lock);
1946 list_splice(&tmp_list, &session->s_cap_releases);
1947 session->s_num_cap_releases += num_cap_releases;
1948 spin_unlock(&session->s_cap_lock);
1951 static void ceph_cap_release_work(struct work_struct *work)
1953 struct ceph_mds_session *session =
1954 container_of(work, struct ceph_mds_session, s_cap_release_work);
1956 mutex_lock(&session->s_mutex);
1957 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
1958 session->s_state == CEPH_MDS_SESSION_HUNG)
1959 ceph_send_cap_releases(session->s_mdsc, session);
1960 mutex_unlock(&session->s_mutex);
1961 ceph_put_mds_session(session);
1964 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
1965 struct ceph_mds_session *session)
1970 get_session(session);
1971 if (queue_work(mdsc->fsc->cap_wq,
1972 &session->s_cap_release_work)) {
1973 dout("cap release work queued\n");
1975 ceph_put_mds_session(session);
1976 dout("failed to queue cap release work\n");
1981 * caller holds session->s_cap_lock
1983 void __ceph_queue_cap_release(struct ceph_mds_session *session,
1984 struct ceph_cap *cap)
1986 list_add_tail(&cap->session_caps, &session->s_cap_releases);
1987 session->s_num_cap_releases++;
1989 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
1990 ceph_flush_cap_releases(session->s_mdsc, session);
1993 static void ceph_cap_reclaim_work(struct work_struct *work)
1995 struct ceph_mds_client *mdsc =
1996 container_of(work, struct ceph_mds_client, cap_reclaim_work);
1997 int ret = ceph_trim_dentries(mdsc);
1999 ceph_queue_cap_reclaim_work(mdsc);
2002 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2007 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2008 dout("caps reclaim work queued\n");
2010 dout("failed to queue caps release work\n");
2014 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2019 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2020 if ((val % CEPH_CAPS_PER_RELEASE) < nr) {
2021 atomic_set(&mdsc->cap_reclaim_pending, 0);
2022 ceph_queue_cap_reclaim_work(mdsc);
2030 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2033 struct ceph_inode_info *ci = ceph_inode(dir);
2034 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2035 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2036 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2037 unsigned int num_entries;
2040 spin_lock(&ci->i_ceph_lock);
2041 num_entries = ci->i_files + ci->i_subdirs;
2042 spin_unlock(&ci->i_ceph_lock);
2043 num_entries = max(num_entries, 1U);
2044 num_entries = min(num_entries, opt->max_readdir);
2046 order = get_order(size * num_entries);
2047 while (order >= 0) {
2048 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2051 if (rinfo->dir_entries)
2055 if (!rinfo->dir_entries)
2058 num_entries = (PAGE_SIZE << order) / size;
2059 num_entries = min(num_entries, opt->max_readdir);
2061 rinfo->dir_buf_size = PAGE_SIZE << order;
2062 req->r_num_caps = num_entries + 1;
2063 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2064 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2069 * Create an mds request.
2071 struct ceph_mds_request *
2072 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2074 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
2077 return ERR_PTR(-ENOMEM);
2079 mutex_init(&req->r_fill_mutex);
2081 req->r_started = jiffies;
2082 req->r_resend_mds = -1;
2083 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2084 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2086 kref_init(&req->r_kref);
2087 RB_CLEAR_NODE(&req->r_node);
2088 INIT_LIST_HEAD(&req->r_wait);
2089 init_completion(&req->r_completion);
2090 init_completion(&req->r_safe_completion);
2091 INIT_LIST_HEAD(&req->r_unsafe_item);
2093 ktime_get_coarse_real_ts64(&req->r_stamp);
2096 req->r_direct_mode = mode;
2101 * return oldest (lowest) request, tid in request tree, 0 if none.
2103 * called under mdsc->mutex.
2105 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2107 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2109 return rb_entry(rb_first(&mdsc->request_tree),
2110 struct ceph_mds_request, r_node);
2113 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2115 return mdsc->oldest_tid;
2119 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2120 * on build_path_from_dentry in fs/cifs/dir.c.
2122 * If @stop_on_nosnap, generate path relative to the first non-snapped
2125 * Encode hidden .snap dirs as a double /, i.e.
2126 * foo/.snap/bar -> foo//bar
2128 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2131 struct dentry *temp;
2138 return ERR_PTR(-EINVAL);
2142 return ERR_PTR(-ENOMEM);
2147 seq = read_seqbegin(&rename_lock);
2151 struct inode *inode;
2153 spin_lock(&temp->d_lock);
2154 inode = d_inode(temp);
2155 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2156 dout("build_path path+%d: %p SNAPDIR\n",
2158 } else if (stop_on_nosnap && inode && dentry != temp &&
2159 ceph_snap(inode) == CEPH_NOSNAP) {
2160 spin_unlock(&temp->d_lock);
2161 pos++; /* get rid of any prepended '/' */
2164 pos -= temp->d_name.len;
2166 spin_unlock(&temp->d_lock);
2169 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2171 spin_unlock(&temp->d_lock);
2172 temp = READ_ONCE(temp->d_parent);
2174 /* Are we at the root? */
2178 /* Are we out of buffer? */
2184 base = ceph_ino(d_inode(temp));
2187 if (read_seqretry(&rename_lock, seq))
2192 * A rename didn't occur, but somehow we didn't end up where
2193 * we thought we would. Throw a warning and try again.
2195 pr_warn("build_path did not end path lookup where "
2196 "expected, pos is %d\n", pos);
2201 *plen = PATH_MAX - 1 - pos;
2202 dout("build_path on %p %d built %llx '%.*s'\n",
2203 dentry, d_count(dentry), base, *plen, path + pos);
2207 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2208 const char **ppath, int *ppathlen, u64 *pino,
2209 bool *pfreepath, bool parent_locked)
2215 dir = d_inode_rcu(dentry->d_parent);
2216 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2217 *pino = ceph_ino(dir);
2219 *ppath = dentry->d_name.name;
2220 *ppathlen = dentry->d_name.len;
2224 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2226 return PTR_ERR(path);
2232 static int build_inode_path(struct inode *inode,
2233 const char **ppath, int *ppathlen, u64 *pino,
2236 struct dentry *dentry;
2239 if (ceph_snap(inode) == CEPH_NOSNAP) {
2240 *pino = ceph_ino(inode);
2244 dentry = d_find_alias(inode);
2245 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2248 return PTR_ERR(path);
2255 * request arguments may be specified via an inode *, a dentry *, or
2256 * an explicit ino+path.
2258 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2259 struct inode *rdiri, const char *rpath,
2260 u64 rino, const char **ppath, int *pathlen,
2261 u64 *ino, bool *freepath, bool parent_locked)
2266 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2267 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2269 } else if (rdentry) {
2270 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2271 freepath, parent_locked);
2272 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2274 } else if (rpath || rino) {
2277 *pathlen = rpath ? strlen(rpath) : 0;
2278 dout(" path %.*s\n", *pathlen, rpath);
2285 * called under mdsc->mutex
2287 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2288 struct ceph_mds_request *req,
2289 int mds, bool drop_cap_releases)
2291 struct ceph_msg *msg;
2292 struct ceph_mds_request_head *head;
2293 const char *path1 = NULL;
2294 const char *path2 = NULL;
2295 u64 ino1 = 0, ino2 = 0;
2296 int pathlen1 = 0, pathlen2 = 0;
2297 bool freepath1 = false, freepath2 = false;
2303 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2304 req->r_parent, req->r_path1, req->r_ino1.ino,
2305 &path1, &pathlen1, &ino1, &freepath1,
2306 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2307 &req->r_req_flags));
2313 /* If r_old_dentry is set, then assume that its parent is locked */
2314 ret = set_request_path_attr(NULL, req->r_old_dentry,
2315 req->r_old_dentry_dir,
2316 req->r_path2, req->r_ino2.ino,
2317 &path2, &pathlen2, &ino2, &freepath2, true);
2323 len = sizeof(*head) +
2324 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2325 sizeof(struct ceph_timespec);
2327 /* calculate (max) length for cap releases */
2328 len += sizeof(struct ceph_mds_request_release) *
2329 (!!req->r_inode_drop + !!req->r_dentry_drop +
2330 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2331 if (req->r_dentry_drop)
2333 if (req->r_old_dentry_drop)
2336 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2338 msg = ERR_PTR(-ENOMEM);
2342 msg->hdr.version = cpu_to_le16(2);
2343 msg->hdr.tid = cpu_to_le64(req->r_tid);
2345 head = msg->front.iov_base;
2346 p = msg->front.iov_base + sizeof(*head);
2347 end = msg->front.iov_base + msg->front.iov_len;
2349 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2350 head->op = cpu_to_le32(req->r_op);
2351 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2352 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2354 head->args = req->r_args;
2356 ceph_encode_filepath(&p, end, ino1, path1);
2357 ceph_encode_filepath(&p, end, ino2, path2);
2359 /* make note of release offset, in case we need to replay */
2360 req->r_request_release_offset = p - msg->front.iov_base;
2364 if (req->r_inode_drop)
2365 releases += ceph_encode_inode_release(&p,
2366 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2367 mds, req->r_inode_drop, req->r_inode_unless, 0);
2368 if (req->r_dentry_drop)
2369 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2370 req->r_parent, mds, req->r_dentry_drop,
2371 req->r_dentry_unless);
2372 if (req->r_old_dentry_drop)
2373 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2374 req->r_old_dentry_dir, mds,
2375 req->r_old_dentry_drop,
2376 req->r_old_dentry_unless);
2377 if (req->r_old_inode_drop)
2378 releases += ceph_encode_inode_release(&p,
2379 d_inode(req->r_old_dentry),
2380 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2382 if (drop_cap_releases) {
2384 p = msg->front.iov_base + req->r_request_release_offset;
2387 head->num_releases = cpu_to_le16(releases);
2391 struct ceph_timespec ts;
2392 ceph_encode_timespec64(&ts, &req->r_stamp);
2393 ceph_encode_copy(&p, &ts, sizeof(ts));
2397 msg->front.iov_len = p - msg->front.iov_base;
2398 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2400 if (req->r_pagelist) {
2401 struct ceph_pagelist *pagelist = req->r_pagelist;
2402 ceph_msg_data_add_pagelist(msg, pagelist);
2403 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2405 msg->hdr.data_len = 0;
2408 msg->hdr.data_off = cpu_to_le16(0);
2412 ceph_mdsc_free_path((char *)path2, pathlen2);
2415 ceph_mdsc_free_path((char *)path1, pathlen1);
2421 * called under mdsc->mutex if error, under no mutex if
2424 static void complete_request(struct ceph_mds_client *mdsc,
2425 struct ceph_mds_request *req)
2427 if (req->r_callback)
2428 req->r_callback(mdsc, req);
2429 complete_all(&req->r_completion);
2433 * called under mdsc->mutex
2435 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2436 struct ceph_mds_request *req,
2437 int mds, bool drop_cap_releases)
2439 struct ceph_mds_request_head *rhead;
2440 struct ceph_msg *msg;
2445 struct ceph_cap *cap =
2446 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2449 req->r_sent_on_mseq = cap->mseq;
2451 req->r_sent_on_mseq = -1;
2453 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2454 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2456 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2459 * Replay. Do not regenerate message (and rebuild
2460 * paths, etc.); just use the original message.
2461 * Rebuilding paths will break for renames because
2462 * d_move mangles the src name.
2464 msg = req->r_request;
2465 rhead = msg->front.iov_base;
2467 flags = le32_to_cpu(rhead->flags);
2468 flags |= CEPH_MDS_FLAG_REPLAY;
2469 rhead->flags = cpu_to_le32(flags);
2471 if (req->r_target_inode)
2472 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2474 rhead->num_retry = req->r_attempts - 1;
2476 /* remove cap/dentry releases from message */
2477 rhead->num_releases = 0;
2480 p = msg->front.iov_base + req->r_request_release_offset;
2482 struct ceph_timespec ts;
2483 ceph_encode_timespec64(&ts, &req->r_stamp);
2484 ceph_encode_copy(&p, &ts, sizeof(ts));
2487 msg->front.iov_len = p - msg->front.iov_base;
2488 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2492 if (req->r_request) {
2493 ceph_msg_put(req->r_request);
2494 req->r_request = NULL;
2496 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2498 req->r_err = PTR_ERR(msg);
2499 return PTR_ERR(msg);
2501 req->r_request = msg;
2503 rhead = msg->front.iov_base;
2504 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2505 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2506 flags |= CEPH_MDS_FLAG_REPLAY;
2508 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2509 rhead->flags = cpu_to_le32(flags);
2510 rhead->num_fwd = req->r_num_fwd;
2511 rhead->num_retry = req->r_attempts - 1;
2514 dout(" r_parent = %p\n", req->r_parent);
2519 * send request, or put it on the appropriate wait list.
2521 static void __do_request(struct ceph_mds_client *mdsc,
2522 struct ceph_mds_request *req)
2524 struct ceph_mds_session *session = NULL;
2528 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2529 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2530 __unregister_request(mdsc, req);
2534 if (req->r_timeout &&
2535 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2536 dout("do_request timed out\n");
2540 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2541 dout("do_request forced umount\n");
2545 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2546 if (mdsc->mdsmap_err) {
2547 err = mdsc->mdsmap_err;
2548 dout("do_request mdsmap err %d\n", err);
2551 if (mdsc->mdsmap->m_epoch == 0) {
2552 dout("do_request no mdsmap, waiting for map\n");
2553 list_add(&req->r_wait, &mdsc->waiting_for_map);
2556 if (!(mdsc->fsc->mount_options->flags &
2557 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2558 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2560 pr_info("probably no mds server is up\n");
2565 put_request_session(req);
2567 mds = __choose_mds(mdsc, req);
2569 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2570 dout("do_request no mds or not active, waiting for map\n");
2571 list_add(&req->r_wait, &mdsc->waiting_for_map);
2575 /* get, open session */
2576 session = __ceph_lookup_mds_session(mdsc, mds);
2578 session = register_session(mdsc, mds);
2579 if (IS_ERR(session)) {
2580 err = PTR_ERR(session);
2584 req->r_session = get_session(session);
2586 dout("do_request mds%d session %p state %s\n", mds, session,
2587 ceph_session_state_name(session->s_state));
2588 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2589 session->s_state != CEPH_MDS_SESSION_HUNG) {
2590 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2594 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2595 session->s_state == CEPH_MDS_SESSION_CLOSING)
2596 __open_session(mdsc, session);
2597 list_add(&req->r_wait, &session->s_waiting);
2602 req->r_resend_mds = -1; /* forget any previous mds hint */
2604 if (req->r_request_started == 0) /* note request start time */
2605 req->r_request_started = jiffies;
2607 err = __prepare_send_request(mdsc, req, mds, false);
2609 ceph_msg_get(req->r_request);
2610 ceph_con_send(&session->s_con, req->r_request);
2614 ceph_put_mds_session(session);
2617 dout("__do_request early error %d\n", err);
2619 complete_request(mdsc, req);
2620 __unregister_request(mdsc, req);
2626 * called under mdsc->mutex
2628 static void __wake_requests(struct ceph_mds_client *mdsc,
2629 struct list_head *head)
2631 struct ceph_mds_request *req;
2632 LIST_HEAD(tmp_list);
2634 list_splice_init(head, &tmp_list);
2636 while (!list_empty(&tmp_list)) {
2637 req = list_entry(tmp_list.next,
2638 struct ceph_mds_request, r_wait);
2639 list_del_init(&req->r_wait);
2640 dout(" wake request %p tid %llu\n", req, req->r_tid);
2641 __do_request(mdsc, req);
2646 * Wake up threads with requests pending for @mds, so that they can
2647 * resubmit their requests to a possibly different mds.
2649 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2651 struct ceph_mds_request *req;
2652 struct rb_node *p = rb_first(&mdsc->request_tree);
2654 dout("kick_requests mds%d\n", mds);
2656 req = rb_entry(p, struct ceph_mds_request, r_node);
2658 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2660 if (req->r_attempts > 0)
2661 continue; /* only new requests */
2662 if (req->r_session &&
2663 req->r_session->s_mds == mds) {
2664 dout(" kicking tid %llu\n", req->r_tid);
2665 list_del_init(&req->r_wait);
2666 __do_request(mdsc, req);
2671 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2672 struct ceph_mds_request *req)
2676 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2678 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2679 if (req->r_parent) {
2680 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2681 ihold(req->r_parent);
2683 if (req->r_old_dentry_dir)
2684 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2687 dout("submit_request on %p for inode %p\n", req, dir);
2688 mutex_lock(&mdsc->mutex);
2689 __register_request(mdsc, req, dir);
2690 __do_request(mdsc, req);
2692 mutex_unlock(&mdsc->mutex);
2696 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2697 struct ceph_mds_request *req)
2702 dout("do_request waiting\n");
2703 if (!req->r_timeout && req->r_wait_for_completion) {
2704 err = req->r_wait_for_completion(mdsc, req);
2706 long timeleft = wait_for_completion_killable_timeout(
2708 ceph_timeout_jiffies(req->r_timeout));
2712 err = -EIO; /* timed out */
2714 err = timeleft; /* killed */
2716 dout("do_request waited, got %d\n", err);
2717 mutex_lock(&mdsc->mutex);
2719 /* only abort if we didn't race with a real reply */
2720 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2721 err = le32_to_cpu(req->r_reply_info.head->result);
2722 } else if (err < 0) {
2723 dout("aborted request %lld with %d\n", req->r_tid, err);
2726 * ensure we aren't running concurrently with
2727 * ceph_fill_trace or ceph_readdir_prepopulate, which
2728 * rely on locks (dir mutex) held by our caller.
2730 mutex_lock(&req->r_fill_mutex);
2732 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2733 mutex_unlock(&req->r_fill_mutex);
2735 if (req->r_parent &&
2736 (req->r_op & CEPH_MDS_OP_WRITE))
2737 ceph_invalidate_dir_request(req);
2742 mutex_unlock(&mdsc->mutex);
2747 * Synchrously perform an mds request. Take care of all of the
2748 * session setup, forwarding, retry details.
2750 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2752 struct ceph_mds_request *req)
2756 dout("do_request on %p\n", req);
2759 err = ceph_mdsc_submit_request(mdsc, dir, req);
2761 err = ceph_mdsc_wait_request(mdsc, req);
2762 dout("do_request %p done, result %d\n", req, err);
2767 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2768 * namespace request.
2770 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2772 struct inode *dir = req->r_parent;
2773 struct inode *old_dir = req->r_old_dentry_dir;
2775 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2777 ceph_dir_clear_complete(dir);
2779 ceph_dir_clear_complete(old_dir);
2781 ceph_invalidate_dentry_lease(req->r_dentry);
2782 if (req->r_old_dentry)
2783 ceph_invalidate_dentry_lease(req->r_old_dentry);
2789 * We take the session mutex and parse and process the reply immediately.
2790 * This preserves the logical ordering of replies, capabilities, etc., sent
2791 * by the MDS as they are applied to our local cache.
2793 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2795 struct ceph_mds_client *mdsc = session->s_mdsc;
2796 struct ceph_mds_request *req;
2797 struct ceph_mds_reply_head *head = msg->front.iov_base;
2798 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2799 struct ceph_snap_realm *realm;
2802 int mds = session->s_mds;
2804 if (msg->front.iov_len < sizeof(*head)) {
2805 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2810 /* get request, session */
2811 tid = le64_to_cpu(msg->hdr.tid);
2812 mutex_lock(&mdsc->mutex);
2813 req = lookup_get_request(mdsc, tid);
2815 dout("handle_reply on unknown tid %llu\n", tid);
2816 mutex_unlock(&mdsc->mutex);
2819 dout("handle_reply %p\n", req);
2821 /* correct session? */
2822 if (req->r_session != session) {
2823 pr_err("mdsc_handle_reply got %llu on session mds%d"
2824 " not mds%d\n", tid, session->s_mds,
2825 req->r_session ? req->r_session->s_mds : -1);
2826 mutex_unlock(&mdsc->mutex);
2831 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2832 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2833 pr_warn("got a dup %s reply on %llu from mds%d\n",
2834 head->safe ? "safe" : "unsafe", tid, mds);
2835 mutex_unlock(&mdsc->mutex);
2838 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2839 pr_warn("got unsafe after safe on %llu from mds%d\n",
2841 mutex_unlock(&mdsc->mutex);
2845 result = le32_to_cpu(head->result);
2849 * if we're not talking to the authority, send to them
2850 * if the authority has changed while we weren't looking,
2851 * send to new authority
2852 * Otherwise we just have to return an ESTALE
2854 if (result == -ESTALE) {
2855 dout("got ESTALE on request %llu\n", req->r_tid);
2856 req->r_resend_mds = -1;
2857 if (req->r_direct_mode != USE_AUTH_MDS) {
2858 dout("not using auth, setting for that now\n");
2859 req->r_direct_mode = USE_AUTH_MDS;
2860 __do_request(mdsc, req);
2861 mutex_unlock(&mdsc->mutex);
2864 int mds = __choose_mds(mdsc, req);
2865 if (mds >= 0 && mds != req->r_session->s_mds) {
2866 dout("but auth changed, so resending\n");
2867 __do_request(mdsc, req);
2868 mutex_unlock(&mdsc->mutex);
2872 dout("have to return ESTALE on request %llu\n", req->r_tid);
2877 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2878 __unregister_request(mdsc, req);
2880 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2882 * We already handled the unsafe response, now do the
2883 * cleanup. No need to examine the response; the MDS
2884 * doesn't include any result info in the safe
2885 * response. And even if it did, there is nothing
2886 * useful we could do with a revised return value.
2888 dout("got safe reply %llu, mds%d\n", tid, mds);
2890 /* last unsafe request during umount? */
2891 if (mdsc->stopping && !__get_oldest_req(mdsc))
2892 complete_all(&mdsc->safe_umount_waiters);
2893 mutex_unlock(&mdsc->mutex);
2897 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2898 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2899 if (req->r_unsafe_dir) {
2900 struct ceph_inode_info *ci =
2901 ceph_inode(req->r_unsafe_dir);
2902 spin_lock(&ci->i_unsafe_lock);
2903 list_add_tail(&req->r_unsafe_dir_item,
2904 &ci->i_unsafe_dirops);
2905 spin_unlock(&ci->i_unsafe_lock);
2909 dout("handle_reply tid %lld result %d\n", tid, result);
2910 rinfo = &req->r_reply_info;
2911 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
2912 err = parse_reply_info(msg, rinfo, (u64)-1);
2914 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2915 mutex_unlock(&mdsc->mutex);
2917 mutex_lock(&session->s_mutex);
2919 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2926 if (rinfo->snapblob_len) {
2927 down_write(&mdsc->snap_rwsem);
2928 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2929 rinfo->snapblob + rinfo->snapblob_len,
2930 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2932 downgrade_write(&mdsc->snap_rwsem);
2934 down_read(&mdsc->snap_rwsem);
2937 /* insert trace into our cache */
2938 mutex_lock(&req->r_fill_mutex);
2939 current->journal_info = req;
2940 err = ceph_fill_trace(mdsc->fsc->sb, req);
2942 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2943 req->r_op == CEPH_MDS_OP_LSSNAP))
2944 ceph_readdir_prepopulate(req, req->r_session);
2946 current->journal_info = NULL;
2947 mutex_unlock(&req->r_fill_mutex);
2949 up_read(&mdsc->snap_rwsem);
2951 ceph_put_snap_realm(mdsc, realm);
2954 if (req->r_target_inode &&
2955 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2956 struct ceph_inode_info *ci =
2957 ceph_inode(req->r_target_inode);
2958 spin_lock(&ci->i_unsafe_lock);
2959 list_add_tail(&req->r_unsafe_target_item,
2960 &ci->i_unsafe_iops);
2961 spin_unlock(&ci->i_unsafe_lock);
2964 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2967 mutex_lock(&mdsc->mutex);
2968 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2972 req->r_reply = ceph_msg_get(msg);
2973 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2976 dout("reply arrived after request %lld was aborted\n", tid);
2978 mutex_unlock(&mdsc->mutex);
2980 mutex_unlock(&session->s_mutex);
2982 /* kick calling process */
2983 complete_request(mdsc, req);
2985 ceph_mdsc_put_request(req);
2992 * handle mds notification that our request has been forwarded.
2994 static void handle_forward(struct ceph_mds_client *mdsc,
2995 struct ceph_mds_session *session,
2996 struct ceph_msg *msg)
2998 struct ceph_mds_request *req;
2999 u64 tid = le64_to_cpu(msg->hdr.tid);
3003 void *p = msg->front.iov_base;
3004 void *end = p + msg->front.iov_len;
3006 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
3007 next_mds = ceph_decode_32(&p);
3008 fwd_seq = ceph_decode_32(&p);
3010 mutex_lock(&mdsc->mutex);
3011 req = lookup_get_request(mdsc, tid);
3013 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3014 goto out; /* dup reply? */
3017 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3018 dout("forward tid %llu aborted, unregistering\n", tid);
3019 __unregister_request(mdsc, req);
3020 } else if (fwd_seq <= req->r_num_fwd) {
3021 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3022 tid, next_mds, req->r_num_fwd, fwd_seq);
3024 /* resend. forward race not possible; mds would drop */
3025 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3027 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3028 req->r_attempts = 0;
3029 req->r_num_fwd = fwd_seq;
3030 req->r_resend_mds = next_mds;
3031 put_request_session(req);
3032 __do_request(mdsc, req);
3034 ceph_mdsc_put_request(req);
3036 mutex_unlock(&mdsc->mutex);
3040 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3043 static int __decode_session_metadata(void **p, void *end,
3046 /* map<string,string> */
3049 ceph_decode_32_safe(p, end, n, bad);
3052 ceph_decode_32_safe(p, end, len, bad);
3053 ceph_decode_need(p, end, len, bad);
3054 err_str = !strncmp(*p, "error_string", len);
3056 ceph_decode_32_safe(p, end, len, bad);
3057 ceph_decode_need(p, end, len, bad);
3058 if (err_str && strnstr(*p, "blacklisted", len))
3059 *blacklisted = true;
3068 * handle a mds session control message
3070 static void handle_session(struct ceph_mds_session *session,
3071 struct ceph_msg *msg)
3073 struct ceph_mds_client *mdsc = session->s_mdsc;
3074 int mds = session->s_mds;
3075 int msg_version = le16_to_cpu(msg->hdr.version);
3076 void *p = msg->front.iov_base;
3077 void *end = p + msg->front.iov_len;
3078 struct ceph_mds_session_head *h;
3081 unsigned long features = 0;
3083 bool blacklisted = false;
3086 ceph_decode_need(&p, end, sizeof(*h), bad);
3090 op = le32_to_cpu(h->op);
3091 seq = le64_to_cpu(h->seq);
3093 if (msg_version >= 3) {
3095 /* version >= 2, metadata */
3096 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
3098 /* version >= 3, feature bits */
3099 ceph_decode_32_safe(&p, end, len, bad);
3100 ceph_decode_need(&p, end, len, bad);
3101 memcpy(&features, p, min_t(size_t, len, sizeof(features)));
3105 mutex_lock(&mdsc->mutex);
3106 if (op == CEPH_SESSION_CLOSE) {
3107 get_session(session);
3108 __unregister_session(mdsc, session);
3110 /* FIXME: this ttl calculation is generous */
3111 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3112 mutex_unlock(&mdsc->mutex);
3114 mutex_lock(&session->s_mutex);
3116 dout("handle_session mds%d %s %p state %s seq %llu\n",
3117 mds, ceph_session_op_name(op), session,
3118 ceph_session_state_name(session->s_state), seq);
3120 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3121 session->s_state = CEPH_MDS_SESSION_OPEN;
3122 pr_info("mds%d came back\n", session->s_mds);
3126 case CEPH_SESSION_OPEN:
3127 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3128 pr_info("mds%d reconnect success\n", session->s_mds);
3129 session->s_state = CEPH_MDS_SESSION_OPEN;
3130 session->s_features = features;
3131 renewed_caps(mdsc, session, 0);
3134 __close_session(mdsc, session);
3137 case CEPH_SESSION_RENEWCAPS:
3138 if (session->s_renew_seq == seq)
3139 renewed_caps(mdsc, session, 1);
3142 case CEPH_SESSION_CLOSE:
3143 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3144 pr_info("mds%d reconnect denied\n", session->s_mds);
3145 cleanup_session_requests(mdsc, session);
3146 remove_session_caps(session);
3147 wake = 2; /* for good measure */
3148 wake_up_all(&mdsc->session_close_wq);
3151 case CEPH_SESSION_STALE:
3152 pr_info("mds%d caps went stale, renewing\n",
3154 spin_lock(&session->s_gen_ttl_lock);
3155 session->s_cap_gen++;
3156 session->s_cap_ttl = jiffies - 1;
3157 spin_unlock(&session->s_gen_ttl_lock);
3158 send_renew_caps(mdsc, session);
3161 case CEPH_SESSION_RECALL_STATE:
3162 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3165 case CEPH_SESSION_FLUSHMSG:
3166 send_flushmsg_ack(mdsc, session, seq);
3169 case CEPH_SESSION_FORCE_RO:
3170 dout("force_session_readonly %p\n", session);
3171 spin_lock(&session->s_cap_lock);
3172 session->s_readonly = true;
3173 spin_unlock(&session->s_cap_lock);
3174 wake_up_session_caps(session, FORCE_RO);
3177 case CEPH_SESSION_REJECT:
3178 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3179 pr_info("mds%d rejected session\n", session->s_mds);
3180 session->s_state = CEPH_MDS_SESSION_REJECTED;
3181 cleanup_session_requests(mdsc, session);
3182 remove_session_caps(session);
3184 mdsc->fsc->blacklisted = true;
3185 wake = 2; /* for good measure */
3189 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3193 mutex_unlock(&session->s_mutex);
3195 mutex_lock(&mdsc->mutex);
3196 __wake_requests(mdsc, &session->s_waiting);
3198 kick_requests(mdsc, mds);
3199 mutex_unlock(&mdsc->mutex);
3201 if (op == CEPH_SESSION_CLOSE)
3202 ceph_put_mds_session(session);
3206 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3207 (int)msg->front.iov_len);
3214 * called under session->mutex.
3216 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3217 struct ceph_mds_session *session)
3219 struct ceph_mds_request *req, *nreq;
3223 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3225 mutex_lock(&mdsc->mutex);
3226 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
3227 err = __prepare_send_request(mdsc, req, session->s_mds, true);
3229 ceph_msg_get(req->r_request);
3230 ceph_con_send(&session->s_con, req->r_request);
3235 * also re-send old requests when MDS enters reconnect stage. So that MDS
3236 * can process completed request in clientreplay stage.
3238 p = rb_first(&mdsc->request_tree);
3240 req = rb_entry(p, struct ceph_mds_request, r_node);
3242 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3244 if (req->r_attempts == 0)
3245 continue; /* only old requests */
3246 if (req->r_session &&
3247 req->r_session->s_mds == session->s_mds) {
3248 err = __prepare_send_request(mdsc, req,
3249 session->s_mds, true);
3251 ceph_msg_get(req->r_request);
3252 ceph_con_send(&session->s_con, req->r_request);
3256 mutex_unlock(&mdsc->mutex);
3259 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3261 struct ceph_msg *reply;
3262 struct ceph_pagelist *_pagelist;
3267 if (!recon_state->allow_multi)
3270 /* can't handle message that contains both caps and realm */
3271 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3273 /* pre-allocate new pagelist */
3274 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3278 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3282 /* placeholder for nr_caps */
3283 err = ceph_pagelist_encode_32(_pagelist, 0);
3287 if (recon_state->nr_caps) {
3288 /* currently encoding caps */
3289 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3293 /* placeholder for nr_realms (currently encoding relams) */
3294 err = ceph_pagelist_encode_32(_pagelist, 0);
3299 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3303 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3304 addr = kmap_atomic(page);
3305 if (recon_state->nr_caps) {
3306 /* currently encoding caps */
3307 *addr = cpu_to_le32(recon_state->nr_caps);
3309 /* currently encoding relams */
3310 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3312 kunmap_atomic(addr);
3314 reply->hdr.version = cpu_to_le16(5);
3315 reply->hdr.compat_version = cpu_to_le16(4);
3317 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3318 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3320 ceph_con_send(&recon_state->session->s_con, reply);
3321 ceph_pagelist_release(recon_state->pagelist);
3323 recon_state->pagelist = _pagelist;
3324 recon_state->nr_caps = 0;
3325 recon_state->nr_realms = 0;
3326 recon_state->msg_version = 5;
3329 ceph_msg_put(reply);
3331 ceph_pagelist_release(_pagelist);
3336 * Encode information about a cap for a reconnect with the MDS.
3338 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
3342 struct ceph_mds_cap_reconnect v2;
3343 struct ceph_mds_cap_reconnect_v1 v1;
3345 struct ceph_inode_info *ci = cap->ci;
3346 struct ceph_reconnect_state *recon_state = arg;
3347 struct ceph_pagelist *pagelist = recon_state->pagelist;
3351 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3352 inode, ceph_vinop(inode), cap, cap->cap_id,
3353 ceph_cap_string(cap->issued));
3355 spin_lock(&ci->i_ceph_lock);
3356 cap->seq = 0; /* reset cap seq */
3357 cap->issue_seq = 0; /* and issue_seq */
3358 cap->mseq = 0; /* and migrate_seq */
3359 cap->cap_gen = cap->session->s_cap_gen;
3361 if (recon_state->msg_version >= 2) {
3362 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3363 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3364 rec.v2.issued = cpu_to_le32(cap->issued);
3365 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3366 rec.v2.pathbase = 0;
3367 rec.v2.flock_len = (__force __le32)
3368 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3370 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3371 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3372 rec.v1.issued = cpu_to_le32(cap->issued);
3373 rec.v1.size = cpu_to_le64(inode->i_size);
3374 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3375 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3376 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3377 rec.v1.pathbase = 0;
3380 if (list_empty(&ci->i_cap_snaps)) {
3381 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3383 struct ceph_cap_snap *capsnap =
3384 list_first_entry(&ci->i_cap_snaps,
3385 struct ceph_cap_snap, ci_item);
3386 snap_follows = capsnap->follows;
3388 spin_unlock(&ci->i_ceph_lock);
3390 if (recon_state->msg_version >= 2) {
3391 int num_fcntl_locks, num_flock_locks;
3392 struct ceph_filelock *flocks = NULL;
3393 size_t struct_len, total_len = sizeof(u64);
3397 if (rec.v2.flock_len) {
3398 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3400 num_fcntl_locks = 0;
3401 num_flock_locks = 0;
3403 if (num_fcntl_locks + num_flock_locks > 0) {
3404 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3405 sizeof(struct ceph_filelock),
3411 err = ceph_encode_locks_to_buffer(inode, flocks,
3426 if (recon_state->msg_version >= 3) {
3427 /* version, compat_version and struct_len */
3428 total_len += 2 * sizeof(u8) + sizeof(u32);
3432 * number of encoded locks is stable, so copy to pagelist
3434 struct_len = 2 * sizeof(u32) +
3435 (num_fcntl_locks + num_flock_locks) *
3436 sizeof(struct ceph_filelock);
3437 rec.v2.flock_len = cpu_to_le32(struct_len);
3439 struct_len += sizeof(u32) + sizeof(rec.v2);
3442 struct_len += sizeof(u64); /* snap_follows */
3444 total_len += struct_len;
3446 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3447 err = send_reconnect_partial(recon_state);
3449 goto out_freeflocks;
3450 pagelist = recon_state->pagelist;
3453 err = ceph_pagelist_reserve(pagelist, total_len);
3455 goto out_freeflocks;
3457 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3458 if (recon_state->msg_version >= 3) {
3459 ceph_pagelist_encode_8(pagelist, struct_v);
3460 ceph_pagelist_encode_8(pagelist, 1);
3461 ceph_pagelist_encode_32(pagelist, struct_len);
3463 ceph_pagelist_encode_string(pagelist, NULL, 0);
3464 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3465 ceph_locks_to_pagelist(flocks, pagelist,
3466 num_fcntl_locks, num_flock_locks);
3468 ceph_pagelist_encode_64(pagelist, snap_follows);
3475 struct dentry *dentry;
3477 dentry = d_find_alias(inode);
3479 path = ceph_mdsc_build_path(dentry,
3480 &pathlen, &pathbase, 0);
3483 err = PTR_ERR(path);
3486 rec.v1.pathbase = cpu_to_le64(pathbase);
3489 err = ceph_pagelist_reserve(pagelist,
3490 sizeof(u64) + sizeof(u32) +
3491 pathlen + sizeof(rec.v1));
3496 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3497 ceph_pagelist_encode_string(pagelist, path, pathlen);
3498 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3500 ceph_mdsc_free_path(path, pathlen);
3505 recon_state->nr_caps++;
3509 static int encode_snap_realms(struct ceph_mds_client *mdsc,
3510 struct ceph_reconnect_state *recon_state)
3513 struct ceph_pagelist *pagelist = recon_state->pagelist;
3516 if (recon_state->msg_version >= 4) {
3517 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3523 * snaprealms. we provide mds with the ino, seq (version), and
3524 * parent for all of our realms. If the mds has any newer info,
3527 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3528 struct ceph_snap_realm *realm =
3529 rb_entry(p, struct ceph_snap_realm, node);
3530 struct ceph_mds_snaprealm_reconnect sr_rec;
3532 if (recon_state->msg_version >= 4) {
3533 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3536 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3537 err = send_reconnect_partial(recon_state);
3540 pagelist = recon_state->pagelist;
3543 err = ceph_pagelist_reserve(pagelist, need);
3547 ceph_pagelist_encode_8(pagelist, 1);
3548 ceph_pagelist_encode_8(pagelist, 1);
3549 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3552 dout(" adding snap realm %llx seq %lld parent %llx\n",
3553 realm->ino, realm->seq, realm->parent_ino);
3554 sr_rec.ino = cpu_to_le64(realm->ino);
3555 sr_rec.seq = cpu_to_le64(realm->seq);
3556 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3558 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3562 recon_state->nr_realms++;
3570 * If an MDS fails and recovers, clients need to reconnect in order to
3571 * reestablish shared state. This includes all caps issued through
3572 * this session _and_ the snap_realm hierarchy. Because it's not
3573 * clear which snap realms the mds cares about, we send everything we
3574 * know about.. that ensures we'll then get any new info the
3575 * recovering MDS might have.
3577 * This is a relatively heavyweight operation, but it's rare.
3579 * called with mdsc->mutex held.
3581 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3582 struct ceph_mds_session *session)
3584 struct ceph_msg *reply;
3585 int mds = session->s_mds;
3587 struct ceph_reconnect_state recon_state = {
3592 pr_info("mds%d reconnect start\n", mds);
3594 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3595 if (!recon_state.pagelist)
3596 goto fail_nopagelist;
3598 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3602 mutex_lock(&session->s_mutex);
3603 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3606 dout("session %p state %s\n", session,
3607 ceph_session_state_name(session->s_state));
3609 spin_lock(&session->s_gen_ttl_lock);
3610 session->s_cap_gen++;
3611 spin_unlock(&session->s_gen_ttl_lock);
3613 spin_lock(&session->s_cap_lock);
3614 /* don't know if session is readonly */
3615 session->s_readonly = 0;
3617 * notify __ceph_remove_cap() that we are composing cap reconnect.
3618 * If a cap get released before being added to the cap reconnect,
3619 * __ceph_remove_cap() should skip queuing cap release.
3621 session->s_cap_reconnect = 1;
3622 /* drop old cap expires; we're about to reestablish that state */
3623 detach_cap_releases(session, &dispose);
3624 spin_unlock(&session->s_cap_lock);
3625 dispose_cap_releases(mdsc, &dispose);
3627 /* trim unused caps to reduce MDS's cache rejoin time */
3628 if (mdsc->fsc->sb->s_root)
3629 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3631 ceph_con_close(&session->s_con);
3632 ceph_con_open(&session->s_con,
3633 CEPH_ENTITY_TYPE_MDS, mds,
3634 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3636 /* replay unsafe requests */
3637 replay_unsafe_requests(mdsc, session);
3639 ceph_early_kick_flushing_caps(mdsc, session);
3641 down_read(&mdsc->snap_rwsem);
3643 /* placeholder for nr_caps */
3644 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
3648 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
3649 recon_state.msg_version = 3;
3650 recon_state.allow_multi = true;
3651 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3652 recon_state.msg_version = 3;
3654 recon_state.msg_version = 2;
3656 /* trsaverse this session's caps */
3657 err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
3659 spin_lock(&session->s_cap_lock);
3660 session->s_cap_reconnect = 0;
3661 spin_unlock(&session->s_cap_lock);
3666 /* check if all realms can be encoded into current message */
3667 if (mdsc->num_snap_realms) {
3669 recon_state.pagelist->length +
3670 mdsc->num_snap_realms *
3671 sizeof(struct ceph_mds_snaprealm_reconnect);
3672 if (recon_state.msg_version >= 4) {
3673 /* number of realms */
3674 total_len += sizeof(u32);
3675 /* version, compat_version and struct_len */
3676 total_len += mdsc->num_snap_realms *
3677 (2 * sizeof(u8) + sizeof(u32));
3679 if (total_len > RECONNECT_MAX_SIZE) {
3680 if (!recon_state.allow_multi) {
3684 if (recon_state.nr_caps) {
3685 err = send_reconnect_partial(&recon_state);
3689 recon_state.msg_version = 5;
3693 err = encode_snap_realms(mdsc, &recon_state);
3697 if (recon_state.msg_version >= 5) {
3698 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3703 if (recon_state.nr_caps || recon_state.nr_realms) {
3705 list_first_entry(&recon_state.pagelist->head,
3707 __le32 *addr = kmap_atomic(page);
3708 if (recon_state.nr_caps) {
3709 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3710 *addr = cpu_to_le32(recon_state.nr_caps);
3711 } else if (recon_state.msg_version >= 4) {
3712 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3714 kunmap_atomic(addr);
3717 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3718 if (recon_state.msg_version >= 4)
3719 reply->hdr.compat_version = cpu_to_le16(4);
3721 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3722 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
3724 ceph_con_send(&session->s_con, reply);
3726 mutex_unlock(&session->s_mutex);
3728 mutex_lock(&mdsc->mutex);
3729 __wake_requests(mdsc, &session->s_waiting);
3730 mutex_unlock(&mdsc->mutex);
3732 up_read(&mdsc->snap_rwsem);
3733 ceph_pagelist_release(recon_state.pagelist);
3737 ceph_msg_put(reply);
3738 up_read(&mdsc->snap_rwsem);
3739 mutex_unlock(&session->s_mutex);
3741 ceph_pagelist_release(recon_state.pagelist);
3743 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3749 * compare old and new mdsmaps, kicking requests
3750 * and closing out old connections as necessary
3752 * called under mdsc->mutex.
3754 static void check_new_map(struct ceph_mds_client *mdsc,
3755 struct ceph_mdsmap *newmap,
3756 struct ceph_mdsmap *oldmap)
3759 int oldstate, newstate;
3760 struct ceph_mds_session *s;
3762 dout("check_new_map new %u old %u\n",
3763 newmap->m_epoch, oldmap->m_epoch);
3765 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3766 if (!mdsc->sessions[i])
3768 s = mdsc->sessions[i];
3769 oldstate = ceph_mdsmap_get_state(oldmap, i);
3770 newstate = ceph_mdsmap_get_state(newmap, i);
3772 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3773 i, ceph_mds_state_name(oldstate),
3774 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3775 ceph_mds_state_name(newstate),
3776 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3777 ceph_session_state_name(s->s_state));
3779 if (i >= newmap->m_num_mds) {
3780 /* force close session for stopped mds */
3782 __unregister_session(mdsc, s);
3783 __wake_requests(mdsc, &s->s_waiting);
3784 mutex_unlock(&mdsc->mutex);
3786 mutex_lock(&s->s_mutex);
3787 cleanup_session_requests(mdsc, s);
3788 remove_session_caps(s);
3789 mutex_unlock(&s->s_mutex);
3791 ceph_put_mds_session(s);
3793 mutex_lock(&mdsc->mutex);
3794 kick_requests(mdsc, i);
3798 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
3799 ceph_mdsmap_get_addr(newmap, i),
3800 sizeof(struct ceph_entity_addr))) {
3802 mutex_unlock(&mdsc->mutex);
3803 mutex_lock(&s->s_mutex);
3804 mutex_lock(&mdsc->mutex);
3805 ceph_con_close(&s->s_con);
3806 mutex_unlock(&s->s_mutex);
3807 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3808 } else if (oldstate == newstate) {
3809 continue; /* nothing new with this mds */
3815 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3816 newstate >= CEPH_MDS_STATE_RECONNECT) {
3817 mutex_unlock(&mdsc->mutex);
3818 send_mds_reconnect(mdsc, s);
3819 mutex_lock(&mdsc->mutex);
3823 * kick request on any mds that has gone active.
3825 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3826 newstate >= CEPH_MDS_STATE_ACTIVE) {
3827 if (oldstate != CEPH_MDS_STATE_CREATING &&
3828 oldstate != CEPH_MDS_STATE_STARTING)
3829 pr_info("mds%d recovery completed\n", s->s_mds);
3830 kick_requests(mdsc, i);
3831 ceph_kick_flushing_caps(mdsc, s);
3832 wake_up_session_caps(s, RECONNECT);
3836 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3837 s = mdsc->sessions[i];
3840 if (!ceph_mdsmap_is_laggy(newmap, i))
3842 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3843 s->s_state == CEPH_MDS_SESSION_HUNG ||
3844 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3845 dout(" connecting to export targets of laggy mds%d\n",
3847 __open_export_target_sessions(mdsc, s);
3859 * caller must hold session s_mutex, dentry->d_lock
3861 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3863 struct ceph_dentry_info *di = ceph_dentry(dentry);
3865 ceph_put_mds_session(di->lease_session);
3866 di->lease_session = NULL;
3869 static void handle_lease(struct ceph_mds_client *mdsc,
3870 struct ceph_mds_session *session,
3871 struct ceph_msg *msg)
3873 struct super_block *sb = mdsc->fsc->sb;
3874 struct inode *inode;
3875 struct dentry *parent, *dentry;
3876 struct ceph_dentry_info *di;
3877 int mds = session->s_mds;
3878 struct ceph_mds_lease *h = msg->front.iov_base;
3880 struct ceph_vino vino;
3884 dout("handle_lease from mds%d\n", mds);
3887 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3889 vino.ino = le64_to_cpu(h->ino);
3890 vino.snap = CEPH_NOSNAP;
3891 seq = le32_to_cpu(h->seq);
3892 dname.len = get_unaligned_le32(h + 1);
3893 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
3895 dname.name = (void *)(h + 1) + sizeof(u32);
3898 inode = ceph_find_inode(sb, vino);
3899 dout("handle_lease %s, ino %llx %p %.*s\n",
3900 ceph_lease_op_name(h->action), vino.ino, inode,
3901 dname.len, dname.name);
3903 mutex_lock(&session->s_mutex);
3907 dout("handle_lease no inode %llx\n", vino.ino);
3912 parent = d_find_alias(inode);
3914 dout("no parent dentry on inode %p\n", inode);
3916 goto release; /* hrm... */
3918 dname.hash = full_name_hash(parent, dname.name, dname.len);
3919 dentry = d_lookup(parent, &dname);
3924 spin_lock(&dentry->d_lock);
3925 di = ceph_dentry(dentry);
3926 switch (h->action) {
3927 case CEPH_MDS_LEASE_REVOKE:
3928 if (di->lease_session == session) {
3929 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3930 h->seq = cpu_to_le32(di->lease_seq);
3931 __ceph_mdsc_drop_dentry_lease(dentry);
3936 case CEPH_MDS_LEASE_RENEW:
3937 if (di->lease_session == session &&
3938 di->lease_gen == session->s_cap_gen &&
3939 di->lease_renew_from &&
3940 di->lease_renew_after == 0) {
3941 unsigned long duration =
3942 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3944 di->lease_seq = seq;
3945 di->time = di->lease_renew_from + duration;
3946 di->lease_renew_after = di->lease_renew_from +
3948 di->lease_renew_from = 0;
3952 spin_unlock(&dentry->d_lock);
3959 /* let's just reuse the same message */
3960 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3962 ceph_con_send(&session->s_con, msg);
3965 mutex_unlock(&session->s_mutex);
3966 /* avoid calling iput_final() in mds dispatch threads */
3967 ceph_async_iput(inode);
3971 pr_err("corrupt lease message\n");
3975 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3976 struct dentry *dentry, char action,
3979 struct ceph_msg *msg;
3980 struct ceph_mds_lease *lease;
3982 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
3984 dout("lease_send_msg identry %p %s to mds%d\n",
3985 dentry, ceph_lease_op_name(action), session->s_mds);
3987 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3990 lease = msg->front.iov_base;
3991 lease->action = action;
3992 lease->seq = cpu_to_le32(seq);
3994 spin_lock(&dentry->d_lock);
3995 dir = d_inode(dentry->d_parent);
3996 lease->ino = cpu_to_le64(ceph_ino(dir));
3997 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
3999 put_unaligned_le32(dentry->d_name.len, lease + 1);
4000 memcpy((void *)(lease + 1) + 4,
4001 dentry->d_name.name, dentry->d_name.len);
4002 spin_unlock(&dentry->d_lock);
4004 * if this is a preemptive lease RELEASE, no need to
4005 * flush request stream, since the actual request will
4008 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4010 ceph_con_send(&session->s_con, msg);
4014 * lock unlock sessions, to wait ongoing session activities
4016 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4020 mutex_lock(&mdsc->mutex);
4021 for (i = 0; i < mdsc->max_sessions; i++) {
4022 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4025 mutex_unlock(&mdsc->mutex);
4026 mutex_lock(&s->s_mutex);
4027 mutex_unlock(&s->s_mutex);
4028 ceph_put_mds_session(s);
4029 mutex_lock(&mdsc->mutex);
4031 mutex_unlock(&mdsc->mutex);
4034 static void maybe_recover_session(struct ceph_mds_client *mdsc)
4036 struct ceph_fs_client *fsc = mdsc->fsc;
4038 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4041 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4044 if (!READ_ONCE(fsc->blacklisted))
4047 if (fsc->last_auto_reconnect &&
4048 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4051 pr_info("auto reconnect after blacklisted\n");
4052 fsc->last_auto_reconnect = jiffies;
4053 ceph_force_reconnect(fsc->sb);
4057 * delayed work -- periodically trim expired leases, renew caps with mds
4059 static void schedule_delayed(struct ceph_mds_client *mdsc)
4062 unsigned hz = round_jiffies_relative(HZ * delay);
4063 schedule_delayed_work(&mdsc->delayed_work, hz);
4066 static void delayed_work(struct work_struct *work)
4069 struct ceph_mds_client *mdsc =
4070 container_of(work, struct ceph_mds_client, delayed_work.work);
4074 dout("mdsc delayed_work\n");
4076 mutex_lock(&mdsc->mutex);
4077 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4078 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4079 mdsc->last_renew_caps);
4081 mdsc->last_renew_caps = jiffies;
4083 for (i = 0; i < mdsc->max_sessions; i++) {
4084 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4087 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4088 dout("resending session close request for mds%d\n",
4090 request_close_session(mdsc, s);
4091 ceph_put_mds_session(s);
4094 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4095 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4096 s->s_state = CEPH_MDS_SESSION_HUNG;
4097 pr_info("mds%d hung\n", s->s_mds);
4100 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4101 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4102 s->s_state == CEPH_MDS_SESSION_REJECTED) {
4103 /* this mds is failed or recovering, just wait */
4104 ceph_put_mds_session(s);
4107 mutex_unlock(&mdsc->mutex);
4109 mutex_lock(&s->s_mutex);
4111 send_renew_caps(mdsc, s);
4113 ceph_con_keepalive(&s->s_con);
4114 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4115 s->s_state == CEPH_MDS_SESSION_HUNG)
4116 ceph_send_cap_releases(mdsc, s);
4117 mutex_unlock(&s->s_mutex);
4118 ceph_put_mds_session(s);
4120 mutex_lock(&mdsc->mutex);
4122 mutex_unlock(&mdsc->mutex);
4124 ceph_check_delayed_caps(mdsc);
4126 ceph_queue_cap_reclaim_work(mdsc);
4128 ceph_trim_snapid_map(mdsc);
4130 maybe_recover_session(mdsc);
4132 schedule_delayed(mdsc);
4135 int ceph_mdsc_init(struct ceph_fs_client *fsc)
4138 struct ceph_mds_client *mdsc;
4140 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4144 mutex_init(&mdsc->mutex);
4145 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4146 if (!mdsc->mdsmap) {
4152 init_completion(&mdsc->safe_umount_waiters);
4153 init_waitqueue_head(&mdsc->session_close_wq);
4154 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4155 mdsc->sessions = NULL;
4156 atomic_set(&mdsc->num_sessions, 0);
4157 mdsc->max_sessions = 0;
4159 atomic64_set(&mdsc->quotarealms_count, 0);
4160 mdsc->quotarealms_inodes = RB_ROOT;
4161 mutex_init(&mdsc->quotarealms_inodes_mutex);
4162 mdsc->last_snap_seq = 0;
4163 init_rwsem(&mdsc->snap_rwsem);
4164 mdsc->snap_realms = RB_ROOT;
4165 INIT_LIST_HEAD(&mdsc->snap_empty);
4166 mdsc->num_snap_realms = 0;
4167 spin_lock_init(&mdsc->snap_empty_lock);
4169 mdsc->oldest_tid = 0;
4170 mdsc->request_tree = RB_ROOT;
4171 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4172 mdsc->last_renew_caps = jiffies;
4173 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4174 INIT_LIST_HEAD(&mdsc->cap_wait_list);
4175 spin_lock_init(&mdsc->cap_delay_lock);
4176 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4177 spin_lock_init(&mdsc->snap_flush_lock);
4178 mdsc->last_cap_flush_tid = 1;
4179 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4180 INIT_LIST_HEAD(&mdsc->cap_dirty);
4181 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4182 mdsc->num_cap_flushing = 0;
4183 spin_lock_init(&mdsc->cap_dirty_lock);
4184 init_waitqueue_head(&mdsc->cap_flushing_wq);
4185 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4186 atomic_set(&mdsc->cap_reclaim_pending, 0);
4188 spin_lock_init(&mdsc->dentry_list_lock);
4189 INIT_LIST_HEAD(&mdsc->dentry_leases);
4190 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4192 ceph_caps_init(mdsc);
4193 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4195 spin_lock_init(&mdsc->snapid_map_lock);
4196 mdsc->snapid_map_tree = RB_ROOT;
4197 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4199 init_rwsem(&mdsc->pool_perm_rwsem);
4200 mdsc->pool_perm_tree = RB_ROOT;
4202 strscpy(mdsc->nodename, utsname()->nodename,
4203 sizeof(mdsc->nodename));
4208 * Wait for safe replies on open mds requests. If we time out, drop
4209 * all requests from the tree to avoid dangling dentry refs.
4211 static void wait_requests(struct ceph_mds_client *mdsc)
4213 struct ceph_options *opts = mdsc->fsc->client->options;
4214 struct ceph_mds_request *req;
4216 mutex_lock(&mdsc->mutex);
4217 if (__get_oldest_req(mdsc)) {
4218 mutex_unlock(&mdsc->mutex);
4220 dout("wait_requests waiting for requests\n");
4221 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4222 ceph_timeout_jiffies(opts->mount_timeout));
4224 /* tear down remaining requests */
4225 mutex_lock(&mdsc->mutex);
4226 while ((req = __get_oldest_req(mdsc))) {
4227 dout("wait_requests timed out on tid %llu\n",
4229 list_del_init(&req->r_wait);
4230 __unregister_request(mdsc, req);
4233 mutex_unlock(&mdsc->mutex);
4234 dout("wait_requests done\n");
4238 * called before mount is ro, and before dentries are torn down.
4239 * (hmm, does this still race with new lookups?)
4241 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4243 dout("pre_umount\n");
4246 lock_unlock_sessions(mdsc);
4247 ceph_flush_dirty_caps(mdsc);
4248 wait_requests(mdsc);
4251 * wait for reply handlers to drop their request refs and
4252 * their inode/dcache refs
4256 ceph_cleanup_quotarealms_inodes(mdsc);
4260 * wait for all write mds requests to flush.
4262 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4264 struct ceph_mds_request *req = NULL, *nextreq;
4267 mutex_lock(&mdsc->mutex);
4268 dout("wait_unsafe_requests want %lld\n", want_tid);
4270 req = __get_oldest_req(mdsc);
4271 while (req && req->r_tid <= want_tid) {
4272 /* find next request */
4273 n = rb_next(&req->r_node);
4275 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4278 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4279 (req->r_op & CEPH_MDS_OP_WRITE)) {
4281 ceph_mdsc_get_request(req);
4283 ceph_mdsc_get_request(nextreq);
4284 mutex_unlock(&mdsc->mutex);
4285 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4286 req->r_tid, want_tid);
4287 wait_for_completion(&req->r_safe_completion);
4288 mutex_lock(&mdsc->mutex);
4289 ceph_mdsc_put_request(req);
4291 break; /* next dne before, so we're done! */
4292 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4293 /* next request was removed from tree */
4294 ceph_mdsc_put_request(nextreq);
4297 ceph_mdsc_put_request(nextreq); /* won't go away */
4301 mutex_unlock(&mdsc->mutex);
4302 dout("wait_unsafe_requests done\n");
4305 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4307 u64 want_tid, want_flush;
4309 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4313 mutex_lock(&mdsc->mutex);
4314 want_tid = mdsc->last_tid;
4315 mutex_unlock(&mdsc->mutex);
4317 ceph_flush_dirty_caps(mdsc);
4318 spin_lock(&mdsc->cap_dirty_lock);
4319 want_flush = mdsc->last_cap_flush_tid;
4320 if (!list_empty(&mdsc->cap_flush_list)) {
4321 struct ceph_cap_flush *cf =
4322 list_last_entry(&mdsc->cap_flush_list,
4323 struct ceph_cap_flush, g_list);
4326 spin_unlock(&mdsc->cap_dirty_lock);
4328 dout("sync want tid %lld flush_seq %lld\n",
4329 want_tid, want_flush);
4331 wait_unsafe_requests(mdsc, want_tid);
4332 wait_caps_flush(mdsc, want_flush);
4336 * true if all sessions are closed, or we force unmount
4338 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4340 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4342 return atomic_read(&mdsc->num_sessions) <= skipped;
4346 * called after sb is ro.
4348 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4350 struct ceph_options *opts = mdsc->fsc->client->options;
4351 struct ceph_mds_session *session;
4355 dout("close_sessions\n");
4357 /* close sessions */
4358 mutex_lock(&mdsc->mutex);
4359 for (i = 0; i < mdsc->max_sessions; i++) {
4360 session = __ceph_lookup_mds_session(mdsc, i);
4363 mutex_unlock(&mdsc->mutex);
4364 mutex_lock(&session->s_mutex);
4365 if (__close_session(mdsc, session) <= 0)
4367 mutex_unlock(&session->s_mutex);
4368 ceph_put_mds_session(session);
4369 mutex_lock(&mdsc->mutex);
4371 mutex_unlock(&mdsc->mutex);
4373 dout("waiting for sessions to close\n");
4374 wait_event_timeout(mdsc->session_close_wq,
4375 done_closing_sessions(mdsc, skipped),
4376 ceph_timeout_jiffies(opts->mount_timeout));
4378 /* tear down remaining sessions */
4379 mutex_lock(&mdsc->mutex);
4380 for (i = 0; i < mdsc->max_sessions; i++) {
4381 if (mdsc->sessions[i]) {
4382 session = get_session(mdsc->sessions[i]);
4383 __unregister_session(mdsc, session);
4384 mutex_unlock(&mdsc->mutex);
4385 mutex_lock(&session->s_mutex);
4386 remove_session_caps(session);
4387 mutex_unlock(&session->s_mutex);
4388 ceph_put_mds_session(session);
4389 mutex_lock(&mdsc->mutex);
4392 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4393 mutex_unlock(&mdsc->mutex);
4395 ceph_cleanup_snapid_map(mdsc);
4396 ceph_cleanup_empty_realms(mdsc);
4398 cancel_work_sync(&mdsc->cap_reclaim_work);
4399 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4404 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4406 struct ceph_mds_session *session;
4409 dout("force umount\n");
4411 mutex_lock(&mdsc->mutex);
4412 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4413 session = __ceph_lookup_mds_session(mdsc, mds);
4417 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4418 __unregister_session(mdsc, session);
4419 __wake_requests(mdsc, &session->s_waiting);
4420 mutex_unlock(&mdsc->mutex);
4422 mutex_lock(&session->s_mutex);
4423 __close_session(mdsc, session);
4424 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4425 cleanup_session_requests(mdsc, session);
4426 remove_session_caps(session);
4428 mutex_unlock(&session->s_mutex);
4429 ceph_put_mds_session(session);
4431 mutex_lock(&mdsc->mutex);
4432 kick_requests(mdsc, mds);
4434 __wake_requests(mdsc, &mdsc->waiting_for_map);
4435 mutex_unlock(&mdsc->mutex);
4438 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4441 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4443 ceph_mdsmap_destroy(mdsc->mdsmap);
4444 kfree(mdsc->sessions);
4445 ceph_caps_finalize(mdsc);
4446 ceph_pool_perm_destroy(mdsc);
4449 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4451 struct ceph_mds_client *mdsc = fsc->mdsc;
4452 dout("mdsc_destroy %p\n", mdsc);
4457 /* flush out any connection work with references to us */
4460 ceph_mdsc_stop(mdsc);
4464 dout("mdsc_destroy %p done\n", mdsc);
4467 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4469 struct ceph_fs_client *fsc = mdsc->fsc;
4470 const char *mds_namespace = fsc->mount_options->mds_namespace;
4471 void *p = msg->front.iov_base;
4472 void *end = p + msg->front.iov_len;
4476 u32 mount_fscid = (u32)-1;
4477 u8 struct_v, struct_cv;
4480 ceph_decode_need(&p, end, sizeof(u32), bad);
4481 epoch = ceph_decode_32(&p);
4483 dout("handle_fsmap epoch %u\n", epoch);
4485 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4486 struct_v = ceph_decode_8(&p);
4487 struct_cv = ceph_decode_8(&p);
4488 map_len = ceph_decode_32(&p);
4490 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4491 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4493 num_fs = ceph_decode_32(&p);
4494 while (num_fs-- > 0) {
4495 void *info_p, *info_end;
4500 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4501 info_v = ceph_decode_8(&p);
4502 info_cv = ceph_decode_8(&p);
4503 info_len = ceph_decode_32(&p);
4504 ceph_decode_need(&p, end, info_len, bad);
4506 info_end = p + info_len;
4509 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4510 fscid = ceph_decode_32(&info_p);
4511 namelen = ceph_decode_32(&info_p);
4512 ceph_decode_need(&info_p, info_end, namelen, bad);
4514 if (mds_namespace &&
4515 strlen(mds_namespace) == namelen &&
4516 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4517 mount_fscid = fscid;
4522 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4523 if (mount_fscid != (u32)-1) {
4524 fsc->client->monc.fs_cluster_id = mount_fscid;
4525 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4527 ceph_monc_renew_subs(&fsc->client->monc);
4535 pr_err("error decoding fsmap\n");
4537 mutex_lock(&mdsc->mutex);
4538 mdsc->mdsmap_err = err;
4539 __wake_requests(mdsc, &mdsc->waiting_for_map);
4540 mutex_unlock(&mdsc->mutex);
4544 * handle mds map update.
4546 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4550 void *p = msg->front.iov_base;
4551 void *end = p + msg->front.iov_len;
4552 struct ceph_mdsmap *newmap, *oldmap;
4553 struct ceph_fsid fsid;
4556 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4557 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4558 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4560 epoch = ceph_decode_32(&p);
4561 maplen = ceph_decode_32(&p);
4562 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4564 /* do we need it? */
4565 mutex_lock(&mdsc->mutex);
4566 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4567 dout("handle_map epoch %u <= our %u\n",
4568 epoch, mdsc->mdsmap->m_epoch);
4569 mutex_unlock(&mdsc->mutex);
4573 newmap = ceph_mdsmap_decode(&p, end);
4574 if (IS_ERR(newmap)) {
4575 err = PTR_ERR(newmap);
4579 /* swap into place */
4581 oldmap = mdsc->mdsmap;
4582 mdsc->mdsmap = newmap;
4583 check_new_map(mdsc, newmap, oldmap);
4584 ceph_mdsmap_destroy(oldmap);
4586 mdsc->mdsmap = newmap; /* first mds map */
4588 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4591 __wake_requests(mdsc, &mdsc->waiting_for_map);
4592 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4593 mdsc->mdsmap->m_epoch);
4595 mutex_unlock(&mdsc->mutex);
4596 schedule_delayed(mdsc);
4600 mutex_unlock(&mdsc->mutex);
4602 pr_err("error decoding mdsmap %d\n", err);
4606 static struct ceph_connection *con_get(struct ceph_connection *con)
4608 struct ceph_mds_session *s = con->private;
4610 if (get_session(s)) {
4611 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
4614 dout("mdsc con_get %p FAIL\n", s);
4618 static void con_put(struct ceph_connection *con)
4620 struct ceph_mds_session *s = con->private;
4622 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
4623 ceph_put_mds_session(s);
4627 * if the client is unresponsive for long enough, the mds will kill
4628 * the session entirely.
4630 static void peer_reset(struct ceph_connection *con)
4632 struct ceph_mds_session *s = con->private;
4633 struct ceph_mds_client *mdsc = s->s_mdsc;
4635 pr_warn("mds%d closed our session\n", s->s_mds);
4636 send_mds_reconnect(mdsc, s);
4639 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4641 struct ceph_mds_session *s = con->private;
4642 struct ceph_mds_client *mdsc = s->s_mdsc;
4643 int type = le16_to_cpu(msg->hdr.type);
4645 mutex_lock(&mdsc->mutex);
4646 if (__verify_registered_session(mdsc, s) < 0) {
4647 mutex_unlock(&mdsc->mutex);
4650 mutex_unlock(&mdsc->mutex);
4653 case CEPH_MSG_MDS_MAP:
4654 ceph_mdsc_handle_mdsmap(mdsc, msg);
4656 case CEPH_MSG_FS_MAP_USER:
4657 ceph_mdsc_handle_fsmap(mdsc, msg);
4659 case CEPH_MSG_CLIENT_SESSION:
4660 handle_session(s, msg);
4662 case CEPH_MSG_CLIENT_REPLY:
4663 handle_reply(s, msg);
4665 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4666 handle_forward(mdsc, s, msg);
4668 case CEPH_MSG_CLIENT_CAPS:
4669 ceph_handle_caps(s, msg);
4671 case CEPH_MSG_CLIENT_SNAP:
4672 ceph_handle_snap(mdsc, s, msg);
4674 case CEPH_MSG_CLIENT_LEASE:
4675 handle_lease(mdsc, s, msg);
4677 case CEPH_MSG_CLIENT_QUOTA:
4678 ceph_handle_quota(mdsc, s, msg);
4682 pr_err("received unknown message type %d %s\n", type,
4683 ceph_msg_type_name(type));
4694 * Note: returned pointer is the address of a structure that's
4695 * managed separately. Caller must *not* attempt to free it.
4697 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4698 int *proto, int force_new)
4700 struct ceph_mds_session *s = con->private;
4701 struct ceph_mds_client *mdsc = s->s_mdsc;
4702 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4703 struct ceph_auth_handshake *auth = &s->s_auth;
4705 if (force_new && auth->authorizer) {
4706 ceph_auth_destroy_authorizer(auth->authorizer);
4707 auth->authorizer = NULL;
4709 if (!auth->authorizer) {
4710 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4713 return ERR_PTR(ret);
4715 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4718 return ERR_PTR(ret);
4720 *proto = ac->protocol;
4725 static int add_authorizer_challenge(struct ceph_connection *con,
4726 void *challenge_buf, int challenge_buf_len)
4728 struct ceph_mds_session *s = con->private;
4729 struct ceph_mds_client *mdsc = s->s_mdsc;
4730 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4732 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4733 challenge_buf, challenge_buf_len);
4736 static int verify_authorizer_reply(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 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4745 static int invalidate_authorizer(struct ceph_connection *con)
4747 struct ceph_mds_session *s = con->private;
4748 struct ceph_mds_client *mdsc = s->s_mdsc;
4749 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4751 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4753 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4756 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4757 struct ceph_msg_header *hdr, int *skip)
4759 struct ceph_msg *msg;
4760 int type = (int) le16_to_cpu(hdr->type);
4761 int front_len = (int) le32_to_cpu(hdr->front_len);
4767 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4769 pr_err("unable to allocate msg type %d len %d\n",
4777 static int mds_sign_message(struct ceph_msg *msg)
4779 struct ceph_mds_session *s = msg->con->private;
4780 struct ceph_auth_handshake *auth = &s->s_auth;
4782 return ceph_auth_sign_message(auth, msg);
4785 static int mds_check_message_signature(struct ceph_msg *msg)
4787 struct ceph_mds_session *s = msg->con->private;
4788 struct ceph_auth_handshake *auth = &s->s_auth;
4790 return ceph_auth_check_message_signature(auth, msg);
4793 static const struct ceph_connection_operations mds_con_ops = {
4796 .dispatch = dispatch,
4797 .get_authorizer = get_authorizer,
4798 .add_authorizer_challenge = add_authorizer_challenge,
4799 .verify_authorizer_reply = verify_authorizer_reply,
4800 .invalidate_authorizer = invalidate_authorizer,
4801 .peer_reset = peer_reset,
4802 .alloc_msg = mds_alloc_msg,
4803 .sign_message = mds_sign_message,
4804 .check_message_signature = mds_check_message_signature,