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47 * are no longer valid.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 */
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;
409 *p += sizeof(*info->filelock_reply);
411 if (unlikely(*p != end))
420 * parse create results
422 static int parse_reply_info_create(void **p, void *end,
423 struct ceph_mds_reply_info_parsed *info,
426 if (features == (u64)-1 ||
427 (features & CEPH_FEATURE_REPLY_CREATE_INODE)) {
429 info->has_create_ino = false;
431 info->has_create_ino = true;
432 info->ino = ceph_decode_64(p);
436 if (unlikely(*p != end))
445 * parse extra results
447 static int parse_reply_info_extra(void **p, void *end,
448 struct ceph_mds_reply_info_parsed *info,
451 u32 op = le32_to_cpu(info->head->op);
453 if (op == CEPH_MDS_OP_GETFILELOCK)
454 return parse_reply_info_filelock(p, end, info, features);
455 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
456 return parse_reply_info_readdir(p, end, info, features);
457 else if (op == CEPH_MDS_OP_CREATE)
458 return parse_reply_info_create(p, end, info, features);
464 * parse entire mds reply
466 static int parse_reply_info(struct ceph_msg *msg,
467 struct ceph_mds_reply_info_parsed *info,
474 info->head = msg->front.iov_base;
475 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
476 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
479 ceph_decode_32_safe(&p, end, len, bad);
481 ceph_decode_need(&p, end, len, bad);
482 err = parse_reply_info_trace(&p, p+len, info, features);
488 ceph_decode_32_safe(&p, end, len, bad);
490 ceph_decode_need(&p, end, len, bad);
491 err = parse_reply_info_extra(&p, p+len, info, features);
497 ceph_decode_32_safe(&p, end, len, bad);
498 info->snapblob_len = len;
509 pr_err("mds parse_reply err %d\n", err);
513 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
515 if (!info->dir_entries)
517 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
524 const char *ceph_session_state_name(int s)
527 case CEPH_MDS_SESSION_NEW: return "new";
528 case CEPH_MDS_SESSION_OPENING: return "opening";
529 case CEPH_MDS_SESSION_OPEN: return "open";
530 case CEPH_MDS_SESSION_HUNG: return "hung";
531 case CEPH_MDS_SESSION_CLOSING: return "closing";
532 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
533 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
534 case CEPH_MDS_SESSION_REJECTED: return "rejected";
535 default: return "???";
539 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
541 if (refcount_inc_not_zero(&s->s_ref)) {
542 dout("mdsc get_session %p %d -> %d\n", s,
543 refcount_read(&s->s_ref)-1, refcount_read(&s->s_ref));
546 dout("mdsc get_session %p 0 -- FAIL\n", s);
551 void ceph_put_mds_session(struct ceph_mds_session *s)
553 dout("mdsc put_session %p %d -> %d\n", s,
554 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
555 if (refcount_dec_and_test(&s->s_ref)) {
556 if (s->s_auth.authorizer)
557 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
563 * called under mdsc->mutex
565 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
568 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
570 return get_session(mdsc->sessions[mds]);
573 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
575 if (mds >= mdsc->max_sessions || !mdsc->sessions[mds])
581 static int __verify_registered_session(struct ceph_mds_client *mdsc,
582 struct ceph_mds_session *s)
584 if (s->s_mds >= mdsc->max_sessions ||
585 mdsc->sessions[s->s_mds] != s)
591 * create+register a new session for given mds.
592 * called under mdsc->mutex.
594 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
597 struct ceph_mds_session *s;
599 if (mds >= mdsc->mdsmap->m_num_mds)
600 return ERR_PTR(-EINVAL);
602 s = kzalloc(sizeof(*s), GFP_NOFS);
604 return ERR_PTR(-ENOMEM);
606 if (mds >= mdsc->max_sessions) {
607 int newmax = 1 << get_count_order(mds + 1);
608 struct ceph_mds_session **sa;
610 dout("%s: realloc to %d\n", __func__, newmax);
611 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
614 if (mdsc->sessions) {
615 memcpy(sa, mdsc->sessions,
616 mdsc->max_sessions * sizeof(void *));
617 kfree(mdsc->sessions);
620 mdsc->max_sessions = newmax;
623 dout("%s: mds%d\n", __func__, mds);
626 s->s_state = CEPH_MDS_SESSION_NEW;
629 mutex_init(&s->s_mutex);
631 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
633 spin_lock_init(&s->s_gen_ttl_lock);
635 s->s_cap_ttl = jiffies - 1;
637 spin_lock_init(&s->s_cap_lock);
638 s->s_renew_requested = 0;
640 INIT_LIST_HEAD(&s->s_caps);
642 refcount_set(&s->s_ref, 1);
643 INIT_LIST_HEAD(&s->s_waiting);
644 INIT_LIST_HEAD(&s->s_unsafe);
645 s->s_num_cap_releases = 0;
646 s->s_cap_reconnect = 0;
647 s->s_cap_iterator = NULL;
648 INIT_LIST_HEAD(&s->s_cap_releases);
649 INIT_WORK(&s->s_cap_release_work, ceph_cap_release_work);
651 INIT_LIST_HEAD(&s->s_cap_flushing);
653 mdsc->sessions[mds] = s;
654 atomic_inc(&mdsc->num_sessions);
655 refcount_inc(&s->s_ref); /* one ref to sessions[], one to caller */
657 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
658 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
664 return ERR_PTR(-ENOMEM);
668 * called under mdsc->mutex
670 static void __unregister_session(struct ceph_mds_client *mdsc,
671 struct ceph_mds_session *s)
673 dout("__unregister_session mds%d %p\n", s->s_mds, s);
674 BUG_ON(mdsc->sessions[s->s_mds] != s);
675 mdsc->sessions[s->s_mds] = NULL;
677 ceph_con_close(&s->s_con);
678 ceph_put_mds_session(s);
679 atomic_dec(&mdsc->num_sessions);
683 * drop session refs in request.
685 * should be last request ref, or hold mdsc->mutex
687 static void put_request_session(struct ceph_mds_request *req)
689 if (req->r_session) {
690 ceph_put_mds_session(req->r_session);
691 req->r_session = NULL;
695 void ceph_mdsc_release_request(struct kref *kref)
697 struct ceph_mds_request *req = container_of(kref,
698 struct ceph_mds_request,
700 destroy_reply_info(&req->r_reply_info);
702 ceph_msg_put(req->r_request);
704 ceph_msg_put(req->r_reply);
706 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
707 /* avoid calling iput_final() in mds dispatch threads */
708 ceph_async_iput(req->r_inode);
711 ceph_put_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
712 ceph_async_iput(req->r_target_inode);
715 if (req->r_old_dentry)
716 dput(req->r_old_dentry);
717 if (req->r_old_dentry_dir) {
719 * track (and drop pins for) r_old_dentry_dir
720 * separately, since r_old_dentry's d_parent may have
721 * changed between the dir mutex being dropped and
722 * this request being freed.
724 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
726 ceph_async_iput(req->r_old_dentry_dir);
731 ceph_pagelist_release(req->r_pagelist);
732 put_request_session(req);
733 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
734 WARN_ON_ONCE(!list_empty(&req->r_wait));
738 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
741 * lookup session, bump ref if found.
743 * called under mdsc->mutex.
745 static struct ceph_mds_request *
746 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
748 struct ceph_mds_request *req;
750 req = lookup_request(&mdsc->request_tree, tid);
752 ceph_mdsc_get_request(req);
758 * Register an in-flight request, and assign a tid. Link to directory
759 * are modifying (if any).
761 * Called under mdsc->mutex.
763 static void __register_request(struct ceph_mds_client *mdsc,
764 struct ceph_mds_request *req,
769 req->r_tid = ++mdsc->last_tid;
770 if (req->r_num_caps) {
771 ret = ceph_reserve_caps(mdsc, &req->r_caps_reservation,
774 pr_err("__register_request %p "
775 "failed to reserve caps: %d\n", req, ret);
776 /* set req->r_err to fail early from __do_request */
781 dout("__register_request %p tid %lld\n", req, req->r_tid);
782 ceph_mdsc_get_request(req);
783 insert_request(&mdsc->request_tree, req);
785 req->r_uid = current_fsuid();
786 req->r_gid = current_fsgid();
788 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
789 mdsc->oldest_tid = req->r_tid;
793 req->r_unsafe_dir = dir;
797 static void __unregister_request(struct ceph_mds_client *mdsc,
798 struct ceph_mds_request *req)
800 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
802 /* Never leave an unregistered request on an unsafe list! */
803 list_del_init(&req->r_unsafe_item);
805 if (req->r_tid == mdsc->oldest_tid) {
806 struct rb_node *p = rb_next(&req->r_node);
807 mdsc->oldest_tid = 0;
809 struct ceph_mds_request *next_req =
810 rb_entry(p, struct ceph_mds_request, r_node);
811 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
812 mdsc->oldest_tid = next_req->r_tid;
819 erase_request(&mdsc->request_tree, req);
821 if (req->r_unsafe_dir &&
822 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
823 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
824 spin_lock(&ci->i_unsafe_lock);
825 list_del_init(&req->r_unsafe_dir_item);
826 spin_unlock(&ci->i_unsafe_lock);
828 if (req->r_target_inode &&
829 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
830 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
831 spin_lock(&ci->i_unsafe_lock);
832 list_del_init(&req->r_unsafe_target_item);
833 spin_unlock(&ci->i_unsafe_lock);
836 if (req->r_unsafe_dir) {
837 /* avoid calling iput_final() in mds dispatch threads */
838 ceph_async_iput(req->r_unsafe_dir);
839 req->r_unsafe_dir = NULL;
842 complete_all(&req->r_safe_completion);
844 ceph_mdsc_put_request(req);
848 * Walk back up the dentry tree until we hit a dentry representing a
849 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
850 * when calling this) to ensure that the objects won't disappear while we're
851 * working with them. Once we hit a candidate dentry, we attempt to take a
852 * reference to it, and return that as the result.
854 static struct inode *get_nonsnap_parent(struct dentry *dentry)
856 struct inode *inode = NULL;
858 while (dentry && !IS_ROOT(dentry)) {
859 inode = d_inode_rcu(dentry);
860 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
862 dentry = dentry->d_parent;
865 inode = igrab(inode);
870 * Choose mds to send request to next. If there is a hint set in the
871 * request (e.g., due to a prior forward hint from the mds), use that.
872 * Otherwise, consult frag tree and/or caps to identify the
873 * appropriate mds. If all else fails, choose randomly.
875 * Called under mdsc->mutex.
877 static int __choose_mds(struct ceph_mds_client *mdsc,
878 struct ceph_mds_request *req)
881 struct ceph_inode_info *ci;
882 struct ceph_cap *cap;
883 int mode = req->r_direct_mode;
885 u32 hash = req->r_direct_hash;
886 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
889 * is there a specific mds we should try? ignore hint if we have
890 * no session and the mds is not up (active or recovering).
892 if (req->r_resend_mds >= 0 &&
893 (__have_session(mdsc, req->r_resend_mds) ||
894 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
895 dout("choose_mds using resend_mds mds%d\n",
897 return req->r_resend_mds;
900 if (mode == USE_RANDOM_MDS)
905 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
906 inode = req->r_inode;
909 /* req->r_dentry is non-null for LSSNAP request */
911 inode = get_nonsnap_parent(req->r_dentry);
913 dout("__choose_mds using snapdir's parent %p\n", inode);
915 } else if (req->r_dentry) {
916 /* ignore race with rename; old or new d_parent is okay */
917 struct dentry *parent;
921 parent = READ_ONCE(req->r_dentry->d_parent);
922 dir = req->r_parent ? : d_inode_rcu(parent);
924 if (!dir || dir->i_sb != mdsc->fsc->sb) {
925 /* not this fs or parent went negative */
926 inode = d_inode(req->r_dentry);
929 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
930 /* direct snapped/virtual snapdir requests
931 * based on parent dir inode */
932 inode = get_nonsnap_parent(parent);
933 dout("__choose_mds using nonsnap parent %p\n", inode);
936 inode = d_inode(req->r_dentry);
937 if (!inode || mode == USE_AUTH_MDS) {
940 hash = ceph_dentry_hash(dir, req->r_dentry);
949 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
953 ci = ceph_inode(inode);
955 if (is_hash && S_ISDIR(inode->i_mode)) {
956 struct ceph_inode_frag frag;
959 ceph_choose_frag(ci, hash, &frag, &found);
961 if (mode == USE_ANY_MDS && frag.ndist > 0) {
964 /* choose a random replica */
965 get_random_bytes(&r, 1);
968 dout("choose_mds %p %llx.%llx "
969 "frag %u mds%d (%d/%d)\n",
970 inode, ceph_vinop(inode),
973 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
974 CEPH_MDS_STATE_ACTIVE)
978 /* since this file/dir wasn't known to be
979 * replicated, then we want to look for the
980 * authoritative mds. */
983 /* choose auth mds */
985 dout("choose_mds %p %llx.%llx "
986 "frag %u mds%d (auth)\n",
987 inode, ceph_vinop(inode), frag.frag, mds);
988 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
989 CEPH_MDS_STATE_ACTIVE)
995 spin_lock(&ci->i_ceph_lock);
997 if (mode == USE_AUTH_MDS)
998 cap = ci->i_auth_cap;
999 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
1000 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
1002 spin_unlock(&ci->i_ceph_lock);
1003 ceph_async_iput(inode);
1006 mds = cap->session->s_mds;
1007 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
1008 inode, ceph_vinop(inode), mds,
1009 cap == ci->i_auth_cap ? "auth " : "", cap);
1010 spin_unlock(&ci->i_ceph_lock);
1012 /* avoid calling iput_final() while holding mdsc->mutex or
1013 * in mds dispatch threads */
1014 ceph_async_iput(inode);
1018 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
1019 dout("choose_mds chose random mds%d\n", mds);
1027 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
1029 struct ceph_msg *msg;
1030 struct ceph_mds_session_head *h;
1032 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
1035 pr_err("create_session_msg ENOMEM creating msg\n");
1038 h = msg->front.iov_base;
1039 h->op = cpu_to_le32(op);
1040 h->seq = cpu_to_le64(seq);
1045 static void encode_supported_features(void **p, void *end)
1047 static const unsigned char bits[] = CEPHFS_FEATURES_CLIENT_SUPPORTED;
1048 static const size_t count = ARRAY_SIZE(bits);
1052 size_t size = ((size_t)bits[count - 1] + 64) / 64 * 8;
1054 BUG_ON(*p + 4 + size > end);
1055 ceph_encode_32(p, size);
1056 memset(*p, 0, size);
1057 for (i = 0; i < count; i++)
1058 ((unsigned char*)(*p))[i / 8] |= 1 << (bits[i] % 8);
1061 BUG_ON(*p + 4 > end);
1062 ceph_encode_32(p, 0);
1067 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
1068 * to include additional client metadata fields.
1070 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
1072 struct ceph_msg *msg;
1073 struct ceph_mds_session_head *h;
1075 int extra_bytes = 0;
1076 int metadata_key_count = 0;
1077 struct ceph_options *opt = mdsc->fsc->client->options;
1078 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
1081 const char* metadata[][2] = {
1082 {"hostname", mdsc->nodename},
1083 {"kernel_version", init_utsname()->release},
1084 {"entity_id", opt->name ? : ""},
1085 {"root", fsopt->server_path ? : "/"},
1089 /* Calculate serialized length of metadata */
1090 extra_bytes = 4; /* map length */
1091 for (i = 0; metadata[i][0]; ++i) {
1092 extra_bytes += 8 + strlen(metadata[i][0]) +
1093 strlen(metadata[i][1]);
1094 metadata_key_count++;
1096 /* supported feature */
1097 extra_bytes += 4 + 8;
1099 /* Allocate the message */
1100 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + extra_bytes,
1103 pr_err("create_session_msg ENOMEM creating msg\n");
1106 p = msg->front.iov_base;
1107 end = p + msg->front.iov_len;
1110 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
1111 h->seq = cpu_to_le64(seq);
1114 * Serialize client metadata into waiting buffer space, using
1115 * the format that userspace expects for map<string, string>
1117 * ClientSession messages with metadata are v2
1119 msg->hdr.version = cpu_to_le16(3);
1120 msg->hdr.compat_version = cpu_to_le16(1);
1122 /* The write pointer, following the session_head structure */
1125 /* Number of entries in the map */
1126 ceph_encode_32(&p, metadata_key_count);
1128 /* Two length-prefixed strings for each entry in the map */
1129 for (i = 0; metadata[i][0]; ++i) {
1130 size_t const key_len = strlen(metadata[i][0]);
1131 size_t const val_len = strlen(metadata[i][1]);
1133 ceph_encode_32(&p, key_len);
1134 memcpy(p, metadata[i][0], key_len);
1136 ceph_encode_32(&p, val_len);
1137 memcpy(p, metadata[i][1], val_len);
1141 encode_supported_features(&p, end);
1142 msg->front.iov_len = p - msg->front.iov_base;
1143 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1149 * send session open request.
1151 * called under mdsc->mutex
1153 static int __open_session(struct ceph_mds_client *mdsc,
1154 struct ceph_mds_session *session)
1156 struct ceph_msg *msg;
1158 int mds = session->s_mds;
1160 /* wait for mds to go active? */
1161 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
1162 dout("open_session to mds%d (%s)\n", mds,
1163 ceph_mds_state_name(mstate));
1164 session->s_state = CEPH_MDS_SESSION_OPENING;
1165 session->s_renew_requested = jiffies;
1167 /* send connect message */
1168 msg = create_session_open_msg(mdsc, session->s_seq);
1171 ceph_con_send(&session->s_con, msg);
1176 * open sessions for any export targets for the given mds
1178 * called under mdsc->mutex
1180 static struct ceph_mds_session *
1181 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
1183 struct ceph_mds_session *session;
1185 session = __ceph_lookup_mds_session(mdsc, target);
1187 session = register_session(mdsc, target);
1188 if (IS_ERR(session))
1191 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1192 session->s_state == CEPH_MDS_SESSION_CLOSING)
1193 __open_session(mdsc, session);
1198 struct ceph_mds_session *
1199 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
1201 struct ceph_mds_session *session;
1203 dout("open_export_target_session to mds%d\n", target);
1205 mutex_lock(&mdsc->mutex);
1206 session = __open_export_target_session(mdsc, target);
1207 mutex_unlock(&mdsc->mutex);
1212 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1213 struct ceph_mds_session *session)
1215 struct ceph_mds_info *mi;
1216 struct ceph_mds_session *ts;
1217 int i, mds = session->s_mds;
1219 if (mds >= mdsc->mdsmap->m_num_mds)
1222 mi = &mdsc->mdsmap->m_info[mds];
1223 dout("open_export_target_sessions for mds%d (%d targets)\n",
1224 session->s_mds, mi->num_export_targets);
1226 for (i = 0; i < mi->num_export_targets; i++) {
1227 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1229 ceph_put_mds_session(ts);
1233 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1234 struct ceph_mds_session *session)
1236 mutex_lock(&mdsc->mutex);
1237 __open_export_target_sessions(mdsc, session);
1238 mutex_unlock(&mdsc->mutex);
1245 static void detach_cap_releases(struct ceph_mds_session *session,
1246 struct list_head *target)
1248 lockdep_assert_held(&session->s_cap_lock);
1250 list_splice_init(&session->s_cap_releases, target);
1251 session->s_num_cap_releases = 0;
1252 dout("dispose_cap_releases mds%d\n", session->s_mds);
1255 static void dispose_cap_releases(struct ceph_mds_client *mdsc,
1256 struct list_head *dispose)
1258 while (!list_empty(dispose)) {
1259 struct ceph_cap *cap;
1260 /* zero out the in-progress message */
1261 cap = list_first_entry(dispose, struct ceph_cap, session_caps);
1262 list_del(&cap->session_caps);
1263 ceph_put_cap(mdsc, cap);
1267 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1268 struct ceph_mds_session *session)
1270 struct ceph_mds_request *req;
1272 struct ceph_inode_info *ci;
1274 dout("cleanup_session_requests mds%d\n", session->s_mds);
1275 mutex_lock(&mdsc->mutex);
1276 while (!list_empty(&session->s_unsafe)) {
1277 req = list_first_entry(&session->s_unsafe,
1278 struct ceph_mds_request, r_unsafe_item);
1279 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1281 if (req->r_target_inode) {
1282 /* dropping unsafe change of inode's attributes */
1283 ci = ceph_inode(req->r_target_inode);
1284 errseq_set(&ci->i_meta_err, -EIO);
1286 if (req->r_unsafe_dir) {
1287 /* dropping unsafe directory operation */
1288 ci = ceph_inode(req->r_unsafe_dir);
1289 errseq_set(&ci->i_meta_err, -EIO);
1291 __unregister_request(mdsc, req);
1293 /* zero r_attempts, so kick_requests() will re-send requests */
1294 p = rb_first(&mdsc->request_tree);
1296 req = rb_entry(p, struct ceph_mds_request, r_node);
1298 if (req->r_session &&
1299 req->r_session->s_mds == session->s_mds)
1300 req->r_attempts = 0;
1302 mutex_unlock(&mdsc->mutex);
1306 * Helper to safely iterate over all caps associated with a session, with
1307 * special care taken to handle a racing __ceph_remove_cap().
1309 * Caller must hold session s_mutex.
1311 int ceph_iterate_session_caps(struct ceph_mds_session *session,
1312 int (*cb)(struct inode *, struct ceph_cap *,
1315 struct list_head *p;
1316 struct ceph_cap *cap;
1317 struct inode *inode, *last_inode = NULL;
1318 struct ceph_cap *old_cap = NULL;
1321 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1322 spin_lock(&session->s_cap_lock);
1323 p = session->s_caps.next;
1324 while (p != &session->s_caps) {
1325 cap = list_entry(p, struct ceph_cap, session_caps);
1326 inode = igrab(&cap->ci->vfs_inode);
1331 session->s_cap_iterator = cap;
1332 spin_unlock(&session->s_cap_lock);
1335 /* avoid calling iput_final() while holding
1336 * s_mutex or in mds dispatch threads */
1337 ceph_async_iput(last_inode);
1341 ceph_put_cap(session->s_mdsc, old_cap);
1345 ret = cb(inode, cap, arg);
1348 spin_lock(&session->s_cap_lock);
1351 dout("iterate_session_caps finishing cap %p removal\n",
1353 BUG_ON(cap->session != session);
1354 cap->session = NULL;
1355 list_del_init(&cap->session_caps);
1356 session->s_nr_caps--;
1357 if (cap->queue_release)
1358 __ceph_queue_cap_release(session, cap);
1360 old_cap = cap; /* put_cap it w/o locks held */
1367 session->s_cap_iterator = NULL;
1368 spin_unlock(&session->s_cap_lock);
1370 ceph_async_iput(last_inode);
1372 ceph_put_cap(session->s_mdsc, old_cap);
1377 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1380 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1381 struct ceph_inode_info *ci = ceph_inode(inode);
1382 LIST_HEAD(to_remove);
1383 bool dirty_dropped = false;
1384 bool invalidate = false;
1386 dout("removing cap %p, ci is %p, inode is %p\n",
1387 cap, ci, &ci->vfs_inode);
1388 spin_lock(&ci->i_ceph_lock);
1389 if (cap->mds_wanted | cap->issued)
1390 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1391 __ceph_remove_cap(cap, false);
1392 if (!ci->i_auth_cap) {
1393 struct ceph_cap_flush *cf;
1394 struct ceph_mds_client *mdsc = fsc->mdsc;
1396 if (READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
1397 if (inode->i_data.nrpages > 0)
1399 if (ci->i_wrbuffer_ref > 0)
1400 mapping_set_error(&inode->i_data, -EIO);
1403 while (!list_empty(&ci->i_cap_flush_list)) {
1404 cf = list_first_entry(&ci->i_cap_flush_list,
1405 struct ceph_cap_flush, i_list);
1406 list_move(&cf->i_list, &to_remove);
1409 spin_lock(&mdsc->cap_dirty_lock);
1411 list_for_each_entry(cf, &to_remove, i_list)
1412 list_del(&cf->g_list);
1414 if (!list_empty(&ci->i_dirty_item)) {
1415 pr_warn_ratelimited(
1416 " dropping dirty %s state for %p %lld\n",
1417 ceph_cap_string(ci->i_dirty_caps),
1418 inode, ceph_ino(inode));
1419 ci->i_dirty_caps = 0;
1420 list_del_init(&ci->i_dirty_item);
1421 dirty_dropped = true;
1423 if (!list_empty(&ci->i_flushing_item)) {
1424 pr_warn_ratelimited(
1425 " dropping dirty+flushing %s state for %p %lld\n",
1426 ceph_cap_string(ci->i_flushing_caps),
1427 inode, ceph_ino(inode));
1428 ci->i_flushing_caps = 0;
1429 list_del_init(&ci->i_flushing_item);
1430 mdsc->num_cap_flushing--;
1431 dirty_dropped = true;
1433 spin_unlock(&mdsc->cap_dirty_lock);
1435 if (dirty_dropped) {
1436 errseq_set(&ci->i_meta_err, -EIO);
1438 if (ci->i_wrbuffer_ref_head == 0 &&
1439 ci->i_wr_ref == 0 &&
1440 ci->i_dirty_caps == 0 &&
1441 ci->i_flushing_caps == 0) {
1442 ceph_put_snap_context(ci->i_head_snapc);
1443 ci->i_head_snapc = NULL;
1447 if (atomic_read(&ci->i_filelock_ref) > 0) {
1448 /* make further file lock syscall return -EIO */
1449 ci->i_ceph_flags |= CEPH_I_ERROR_FILELOCK;
1450 pr_warn_ratelimited(" dropping file locks for %p %lld\n",
1451 inode, ceph_ino(inode));
1454 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1455 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1456 ci->i_prealloc_cap_flush = NULL;
1459 spin_unlock(&ci->i_ceph_lock);
1460 while (!list_empty(&to_remove)) {
1461 struct ceph_cap_flush *cf;
1462 cf = list_first_entry(&to_remove,
1463 struct ceph_cap_flush, i_list);
1464 list_del(&cf->i_list);
1465 ceph_free_cap_flush(cf);
1468 wake_up_all(&ci->i_cap_wq);
1470 ceph_queue_invalidate(inode);
1477 * caller must hold session s_mutex
1479 static void remove_session_caps(struct ceph_mds_session *session)
1481 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1482 struct super_block *sb = fsc->sb;
1485 dout("remove_session_caps on %p\n", session);
1486 ceph_iterate_session_caps(session, remove_session_caps_cb, fsc);
1488 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1490 spin_lock(&session->s_cap_lock);
1491 if (session->s_nr_caps > 0) {
1492 struct inode *inode;
1493 struct ceph_cap *cap, *prev = NULL;
1494 struct ceph_vino vino;
1496 * iterate_session_caps() skips inodes that are being
1497 * deleted, we need to wait until deletions are complete.
1498 * __wait_on_freeing_inode() is designed for the job,
1499 * but it is not exported, so use lookup inode function
1502 while (!list_empty(&session->s_caps)) {
1503 cap = list_entry(session->s_caps.next,
1504 struct ceph_cap, session_caps);
1508 vino = cap->ci->i_vino;
1509 spin_unlock(&session->s_cap_lock);
1511 inode = ceph_find_inode(sb, vino);
1512 /* avoid calling iput_final() while holding s_mutex */
1513 ceph_async_iput(inode);
1515 spin_lock(&session->s_cap_lock);
1519 // drop cap expires and unlock s_cap_lock
1520 detach_cap_releases(session, &dispose);
1522 BUG_ON(session->s_nr_caps > 0);
1523 BUG_ON(!list_empty(&session->s_cap_flushing));
1524 spin_unlock(&session->s_cap_lock);
1525 dispose_cap_releases(session->s_mdsc, &dispose);
1535 * wake up any threads waiting on this session's caps. if the cap is
1536 * old (didn't get renewed on the client reconnect), remove it now.
1538 * caller must hold s_mutex.
1540 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1543 struct ceph_inode_info *ci = ceph_inode(inode);
1544 unsigned long ev = (unsigned long)arg;
1546 if (ev == RECONNECT) {
1547 spin_lock(&ci->i_ceph_lock);
1548 ci->i_wanted_max_size = 0;
1549 ci->i_requested_max_size = 0;
1550 spin_unlock(&ci->i_ceph_lock);
1551 } else if (ev == RENEWCAPS) {
1552 if (cap->cap_gen < cap->session->s_cap_gen) {
1553 /* mds did not re-issue stale cap */
1554 spin_lock(&ci->i_ceph_lock);
1555 cap->issued = cap->implemented = CEPH_CAP_PIN;
1556 /* make sure mds knows what we want */
1557 if (__ceph_caps_file_wanted(ci) & ~cap->mds_wanted)
1558 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1559 spin_unlock(&ci->i_ceph_lock);
1561 } else if (ev == FORCE_RO) {
1563 wake_up_all(&ci->i_cap_wq);
1567 static void wake_up_session_caps(struct ceph_mds_session *session, int ev)
1569 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1570 ceph_iterate_session_caps(session, wake_up_session_cb,
1571 (void *)(unsigned long)ev);
1575 * Send periodic message to MDS renewing all currently held caps. The
1576 * ack will reset the expiration for all caps from this session.
1578 * caller holds s_mutex
1580 static int send_renew_caps(struct ceph_mds_client *mdsc,
1581 struct ceph_mds_session *session)
1583 struct ceph_msg *msg;
1586 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1587 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1588 pr_info("mds%d caps stale\n", session->s_mds);
1589 session->s_renew_requested = jiffies;
1591 /* do not try to renew caps until a recovering mds has reconnected
1592 * with its clients. */
1593 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1594 if (state < CEPH_MDS_STATE_RECONNECT) {
1595 dout("send_renew_caps ignoring mds%d (%s)\n",
1596 session->s_mds, ceph_mds_state_name(state));
1600 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1601 ceph_mds_state_name(state));
1602 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1603 ++session->s_renew_seq);
1606 ceph_con_send(&session->s_con, msg);
1610 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1611 struct ceph_mds_session *session, u64 seq)
1613 struct ceph_msg *msg;
1615 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1616 session->s_mds, ceph_session_state_name(session->s_state), seq);
1617 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1620 ceph_con_send(&session->s_con, msg);
1626 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1628 * Called under session->s_mutex
1630 static void renewed_caps(struct ceph_mds_client *mdsc,
1631 struct ceph_mds_session *session, int is_renew)
1636 spin_lock(&session->s_cap_lock);
1637 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1639 session->s_cap_ttl = session->s_renew_requested +
1640 mdsc->mdsmap->m_session_timeout*HZ;
1643 if (time_before(jiffies, session->s_cap_ttl)) {
1644 pr_info("mds%d caps renewed\n", session->s_mds);
1647 pr_info("mds%d caps still stale\n", session->s_mds);
1650 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1651 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1652 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1653 spin_unlock(&session->s_cap_lock);
1656 wake_up_session_caps(session, RENEWCAPS);
1660 * send a session close request
1662 static int request_close_session(struct ceph_mds_client *mdsc,
1663 struct ceph_mds_session *session)
1665 struct ceph_msg *msg;
1667 dout("request_close_session mds%d state %s seq %lld\n",
1668 session->s_mds, ceph_session_state_name(session->s_state),
1670 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1673 ceph_con_send(&session->s_con, msg);
1678 * Called with s_mutex held.
1680 static int __close_session(struct ceph_mds_client *mdsc,
1681 struct ceph_mds_session *session)
1683 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1685 session->s_state = CEPH_MDS_SESSION_CLOSING;
1686 return request_close_session(mdsc, session);
1689 static bool drop_negative_children(struct dentry *dentry)
1691 struct dentry *child;
1692 bool all_negative = true;
1694 if (!d_is_dir(dentry))
1697 spin_lock(&dentry->d_lock);
1698 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1699 if (d_really_is_positive(child)) {
1700 all_negative = false;
1704 spin_unlock(&dentry->d_lock);
1707 shrink_dcache_parent(dentry);
1709 return all_negative;
1713 * Trim old(er) caps.
1715 * Because we can't cache an inode without one or more caps, we do
1716 * this indirectly: if a cap is unused, we prune its aliases, at which
1717 * point the inode will hopefully get dropped to.
1719 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1720 * memory pressure from the MDS, though, so it needn't be perfect.
1722 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1724 int *remaining = arg;
1725 struct ceph_inode_info *ci = ceph_inode(inode);
1726 int used, wanted, oissued, mine;
1728 if (*remaining <= 0)
1731 spin_lock(&ci->i_ceph_lock);
1732 mine = cap->issued | cap->implemented;
1733 used = __ceph_caps_used(ci);
1734 wanted = __ceph_caps_file_wanted(ci);
1735 oissued = __ceph_caps_issued_other(ci, cap);
1737 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1738 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1739 ceph_cap_string(used), ceph_cap_string(wanted));
1740 if (cap == ci->i_auth_cap) {
1741 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1742 !list_empty(&ci->i_cap_snaps))
1744 if ((used | wanted) & CEPH_CAP_ANY_WR)
1746 /* Note: it's possible that i_filelock_ref becomes non-zero
1747 * after dropping auth caps. It doesn't hurt because reply
1748 * of lock mds request will re-add auth caps. */
1749 if (atomic_read(&ci->i_filelock_ref) > 0)
1752 /* The inode has cached pages, but it's no longer used.
1753 * we can safely drop it */
1754 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1755 !(oissued & CEPH_CAP_FILE_CACHE)) {
1759 if ((used | wanted) & ~oissued & mine)
1760 goto out; /* we need these caps */
1763 /* we aren't the only cap.. just remove us */
1764 __ceph_remove_cap(cap, true);
1767 struct dentry *dentry;
1768 /* try dropping referring dentries */
1769 spin_unlock(&ci->i_ceph_lock);
1770 dentry = d_find_any_alias(inode);
1771 if (dentry && drop_negative_children(dentry)) {
1774 d_prune_aliases(inode);
1775 count = atomic_read(&inode->i_count);
1778 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1787 spin_unlock(&ci->i_ceph_lock);
1792 * Trim session cap count down to some max number.
1794 int ceph_trim_caps(struct ceph_mds_client *mdsc,
1795 struct ceph_mds_session *session,
1798 int trim_caps = session->s_nr_caps - max_caps;
1800 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1801 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1802 if (trim_caps > 0) {
1803 int remaining = trim_caps;
1805 ceph_iterate_session_caps(session, trim_caps_cb, &remaining);
1806 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1807 session->s_mds, session->s_nr_caps, max_caps,
1808 trim_caps - remaining);
1811 ceph_flush_cap_releases(mdsc, session);
1815 static int check_caps_flush(struct ceph_mds_client *mdsc,
1820 spin_lock(&mdsc->cap_dirty_lock);
1821 if (!list_empty(&mdsc->cap_flush_list)) {
1822 struct ceph_cap_flush *cf =
1823 list_first_entry(&mdsc->cap_flush_list,
1824 struct ceph_cap_flush, g_list);
1825 if (cf->tid <= want_flush_tid) {
1826 dout("check_caps_flush still flushing tid "
1827 "%llu <= %llu\n", cf->tid, want_flush_tid);
1831 spin_unlock(&mdsc->cap_dirty_lock);
1836 * flush all dirty inode data to disk.
1838 * returns true if we've flushed through want_flush_tid
1840 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1843 dout("check_caps_flush want %llu\n", want_flush_tid);
1845 wait_event(mdsc->cap_flushing_wq,
1846 check_caps_flush(mdsc, want_flush_tid));
1848 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1852 * called under s_mutex
1854 static void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1855 struct ceph_mds_session *session)
1857 struct ceph_msg *msg = NULL;
1858 struct ceph_mds_cap_release *head;
1859 struct ceph_mds_cap_item *item;
1860 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1861 struct ceph_cap *cap;
1862 LIST_HEAD(tmp_list);
1863 int num_cap_releases;
1864 __le32 barrier, *cap_barrier;
1866 down_read(&osdc->lock);
1867 barrier = cpu_to_le32(osdc->epoch_barrier);
1868 up_read(&osdc->lock);
1870 spin_lock(&session->s_cap_lock);
1872 list_splice_init(&session->s_cap_releases, &tmp_list);
1873 num_cap_releases = session->s_num_cap_releases;
1874 session->s_num_cap_releases = 0;
1875 spin_unlock(&session->s_cap_lock);
1877 while (!list_empty(&tmp_list)) {
1879 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1880 PAGE_SIZE, GFP_NOFS, false);
1883 head = msg->front.iov_base;
1884 head->num = cpu_to_le32(0);
1885 msg->front.iov_len = sizeof(*head);
1887 msg->hdr.version = cpu_to_le16(2);
1888 msg->hdr.compat_version = cpu_to_le16(1);
1891 cap = list_first_entry(&tmp_list, struct ceph_cap,
1893 list_del(&cap->session_caps);
1896 head = msg->front.iov_base;
1897 put_unaligned_le32(get_unaligned_le32(&head->num) + 1,
1899 item = msg->front.iov_base + msg->front.iov_len;
1900 item->ino = cpu_to_le64(cap->cap_ino);
1901 item->cap_id = cpu_to_le64(cap->cap_id);
1902 item->migrate_seq = cpu_to_le32(cap->mseq);
1903 item->seq = cpu_to_le32(cap->issue_seq);
1904 msg->front.iov_len += sizeof(*item);
1906 ceph_put_cap(mdsc, cap);
1908 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1909 // Append cap_barrier field
1910 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1911 *cap_barrier = barrier;
1912 msg->front.iov_len += sizeof(*cap_barrier);
1914 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1915 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1916 ceph_con_send(&session->s_con, msg);
1921 BUG_ON(num_cap_releases != 0);
1923 spin_lock(&session->s_cap_lock);
1924 if (!list_empty(&session->s_cap_releases))
1926 spin_unlock(&session->s_cap_lock);
1929 // Append cap_barrier field
1930 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1931 *cap_barrier = barrier;
1932 msg->front.iov_len += sizeof(*cap_barrier);
1934 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1935 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1936 ceph_con_send(&session->s_con, msg);
1940 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1942 spin_lock(&session->s_cap_lock);
1943 list_splice(&tmp_list, &session->s_cap_releases);
1944 session->s_num_cap_releases += num_cap_releases;
1945 spin_unlock(&session->s_cap_lock);
1948 static void ceph_cap_release_work(struct work_struct *work)
1950 struct ceph_mds_session *session =
1951 container_of(work, struct ceph_mds_session, s_cap_release_work);
1953 mutex_lock(&session->s_mutex);
1954 if (session->s_state == CEPH_MDS_SESSION_OPEN ||
1955 session->s_state == CEPH_MDS_SESSION_HUNG)
1956 ceph_send_cap_releases(session->s_mdsc, session);
1957 mutex_unlock(&session->s_mutex);
1958 ceph_put_mds_session(session);
1961 void ceph_flush_cap_releases(struct ceph_mds_client *mdsc,
1962 struct ceph_mds_session *session)
1967 get_session(session);
1968 if (queue_work(mdsc->fsc->cap_wq,
1969 &session->s_cap_release_work)) {
1970 dout("cap release work queued\n");
1972 ceph_put_mds_session(session);
1973 dout("failed to queue cap release work\n");
1978 * caller holds session->s_cap_lock
1980 void __ceph_queue_cap_release(struct ceph_mds_session *session,
1981 struct ceph_cap *cap)
1983 list_add_tail(&cap->session_caps, &session->s_cap_releases);
1984 session->s_num_cap_releases++;
1986 if (!(session->s_num_cap_releases % CEPH_CAPS_PER_RELEASE))
1987 ceph_flush_cap_releases(session->s_mdsc, session);
1990 static void ceph_cap_reclaim_work(struct work_struct *work)
1992 struct ceph_mds_client *mdsc =
1993 container_of(work, struct ceph_mds_client, cap_reclaim_work);
1994 int ret = ceph_trim_dentries(mdsc);
1996 ceph_queue_cap_reclaim_work(mdsc);
1999 void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc)
2004 if (queue_work(mdsc->fsc->cap_wq, &mdsc->cap_reclaim_work)) {
2005 dout("caps reclaim work queued\n");
2007 dout("failed to queue caps release work\n");
2011 void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr)
2016 val = atomic_add_return(nr, &mdsc->cap_reclaim_pending);
2017 if (!(val % CEPH_CAPS_PER_RELEASE)) {
2018 atomic_set(&mdsc->cap_reclaim_pending, 0);
2019 ceph_queue_cap_reclaim_work(mdsc);
2027 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
2030 struct ceph_inode_info *ci = ceph_inode(dir);
2031 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
2032 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
2033 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
2034 int order, num_entries;
2036 spin_lock(&ci->i_ceph_lock);
2037 num_entries = ci->i_files + ci->i_subdirs;
2038 spin_unlock(&ci->i_ceph_lock);
2039 num_entries = max(num_entries, 1);
2040 num_entries = min(num_entries, opt->max_readdir);
2042 order = get_order(size * num_entries);
2043 while (order >= 0) {
2044 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
2047 if (rinfo->dir_entries)
2051 if (!rinfo->dir_entries)
2054 num_entries = (PAGE_SIZE << order) / size;
2055 num_entries = min(num_entries, opt->max_readdir);
2057 rinfo->dir_buf_size = PAGE_SIZE << order;
2058 req->r_num_caps = num_entries + 1;
2059 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
2060 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
2065 * Create an mds request.
2067 struct ceph_mds_request *
2068 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
2070 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
2071 struct timespec64 ts;
2074 return ERR_PTR(-ENOMEM);
2076 mutex_init(&req->r_fill_mutex);
2078 req->r_started = jiffies;
2079 req->r_resend_mds = -1;
2080 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
2081 INIT_LIST_HEAD(&req->r_unsafe_target_item);
2083 kref_init(&req->r_kref);
2084 RB_CLEAR_NODE(&req->r_node);
2085 INIT_LIST_HEAD(&req->r_wait);
2086 init_completion(&req->r_completion);
2087 init_completion(&req->r_safe_completion);
2088 INIT_LIST_HEAD(&req->r_unsafe_item);
2090 ktime_get_coarse_real_ts64(&ts);
2091 req->r_stamp = timespec64_trunc(ts, mdsc->fsc->sb->s_time_gran);
2094 req->r_direct_mode = mode;
2099 * return oldest (lowest) request, tid in request tree, 0 if none.
2101 * called under mdsc->mutex.
2103 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
2105 if (RB_EMPTY_ROOT(&mdsc->request_tree))
2107 return rb_entry(rb_first(&mdsc->request_tree),
2108 struct ceph_mds_request, r_node);
2111 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
2113 return mdsc->oldest_tid;
2117 * Build a dentry's path. Allocate on heap; caller must kfree. Based
2118 * on build_path_from_dentry in fs/cifs/dir.c.
2120 * If @stop_on_nosnap, generate path relative to the first non-snapped
2123 * Encode hidden .snap dirs as a double /, i.e.
2124 * foo/.snap/bar -> foo//bar
2126 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *pbase,
2129 struct dentry *temp;
2136 return ERR_PTR(-EINVAL);
2140 return ERR_PTR(-ENOMEM);
2145 seq = read_seqbegin(&rename_lock);
2149 struct inode *inode;
2151 spin_lock(&temp->d_lock);
2152 inode = d_inode(temp);
2153 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
2154 dout("build_path path+%d: %p SNAPDIR\n",
2156 } else if (stop_on_nosnap && inode && dentry != temp &&
2157 ceph_snap(inode) == CEPH_NOSNAP) {
2158 spin_unlock(&temp->d_lock);
2159 pos++; /* get rid of any prepended '/' */
2162 pos -= temp->d_name.len;
2164 spin_unlock(&temp->d_lock);
2167 memcpy(path + pos, temp->d_name.name, temp->d_name.len);
2169 spin_unlock(&temp->d_lock);
2170 temp = READ_ONCE(temp->d_parent);
2172 /* Are we at the root? */
2176 /* Are we out of buffer? */
2182 base = ceph_ino(d_inode(temp));
2184 if (pos < 0 || read_seqretry(&rename_lock, seq)) {
2185 pr_err("build_path did not end path lookup where "
2186 "expected, pos is %d\n", pos);
2187 /* presumably this is only possible if racing with a
2188 rename of one of the parent directories (we can not
2189 lock the dentries above us to prevent this, but
2190 retrying should be harmless) */
2195 *plen = PATH_MAX - 1 - pos;
2196 dout("build_path on %p %d built %llx '%.*s'\n",
2197 dentry, d_count(dentry), base, *plen, path + pos);
2201 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
2202 const char **ppath, int *ppathlen, u64 *pino,
2203 bool *pfreepath, bool parent_locked)
2209 dir = d_inode_rcu(dentry->d_parent);
2210 if (dir && parent_locked && ceph_snap(dir) == CEPH_NOSNAP) {
2211 *pino = ceph_ino(dir);
2213 *ppath = dentry->d_name.name;
2214 *ppathlen = dentry->d_name.len;
2218 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2220 return PTR_ERR(path);
2226 static int build_inode_path(struct inode *inode,
2227 const char **ppath, int *ppathlen, u64 *pino,
2230 struct dentry *dentry;
2233 if (ceph_snap(inode) == CEPH_NOSNAP) {
2234 *pino = ceph_ino(inode);
2238 dentry = d_find_alias(inode);
2239 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
2242 return PTR_ERR(path);
2249 * request arguments may be specified via an inode *, a dentry *, or
2250 * an explicit ino+path.
2252 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
2253 struct inode *rdiri, const char *rpath,
2254 u64 rino, const char **ppath, int *pathlen,
2255 u64 *ino, bool *freepath, bool parent_locked)
2260 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
2261 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
2263 } else if (rdentry) {
2264 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
2265 freepath, parent_locked);
2266 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
2268 } else if (rpath || rino) {
2271 *pathlen = rpath ? strlen(rpath) : 0;
2272 dout(" path %.*s\n", *pathlen, rpath);
2279 * called under mdsc->mutex
2281 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
2282 struct ceph_mds_request *req,
2283 int mds, bool drop_cap_releases)
2285 struct ceph_msg *msg;
2286 struct ceph_mds_request_head *head;
2287 const char *path1 = NULL;
2288 const char *path2 = NULL;
2289 u64 ino1 = 0, ino2 = 0;
2290 int pathlen1 = 0, pathlen2 = 0;
2291 bool freepath1 = false, freepath2 = false;
2297 ret = set_request_path_attr(req->r_inode, req->r_dentry,
2298 req->r_parent, req->r_path1, req->r_ino1.ino,
2299 &path1, &pathlen1, &ino1, &freepath1,
2300 test_bit(CEPH_MDS_R_PARENT_LOCKED,
2301 &req->r_req_flags));
2307 /* If r_old_dentry is set, then assume that its parent is locked */
2308 ret = set_request_path_attr(NULL, req->r_old_dentry,
2309 req->r_old_dentry_dir,
2310 req->r_path2, req->r_ino2.ino,
2311 &path2, &pathlen2, &ino2, &freepath2, true);
2317 len = sizeof(*head) +
2318 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
2319 sizeof(struct ceph_timespec);
2321 /* calculate (max) length for cap releases */
2322 len += sizeof(struct ceph_mds_request_release) *
2323 (!!req->r_inode_drop + !!req->r_dentry_drop +
2324 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
2325 if (req->r_dentry_drop)
2327 if (req->r_old_dentry_drop)
2330 msg = ceph_msg_new2(CEPH_MSG_CLIENT_REQUEST, len, 1, GFP_NOFS, false);
2332 msg = ERR_PTR(-ENOMEM);
2336 msg->hdr.version = cpu_to_le16(2);
2337 msg->hdr.tid = cpu_to_le64(req->r_tid);
2339 head = msg->front.iov_base;
2340 p = msg->front.iov_base + sizeof(*head);
2341 end = msg->front.iov_base + msg->front.iov_len;
2343 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
2344 head->op = cpu_to_le32(req->r_op);
2345 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
2346 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
2347 head->args = req->r_args;
2349 ceph_encode_filepath(&p, end, ino1, path1);
2350 ceph_encode_filepath(&p, end, ino2, path2);
2352 /* make note of release offset, in case we need to replay */
2353 req->r_request_release_offset = p - msg->front.iov_base;
2357 if (req->r_inode_drop)
2358 releases += ceph_encode_inode_release(&p,
2359 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
2360 mds, req->r_inode_drop, req->r_inode_unless, 0);
2361 if (req->r_dentry_drop)
2362 releases += ceph_encode_dentry_release(&p, req->r_dentry,
2363 req->r_parent, mds, req->r_dentry_drop,
2364 req->r_dentry_unless);
2365 if (req->r_old_dentry_drop)
2366 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
2367 req->r_old_dentry_dir, mds,
2368 req->r_old_dentry_drop,
2369 req->r_old_dentry_unless);
2370 if (req->r_old_inode_drop)
2371 releases += ceph_encode_inode_release(&p,
2372 d_inode(req->r_old_dentry),
2373 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2375 if (drop_cap_releases) {
2377 p = msg->front.iov_base + req->r_request_release_offset;
2380 head->num_releases = cpu_to_le16(releases);
2384 struct ceph_timespec ts;
2385 ceph_encode_timespec64(&ts, &req->r_stamp);
2386 ceph_encode_copy(&p, &ts, sizeof(ts));
2390 msg->front.iov_len = p - msg->front.iov_base;
2391 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2393 if (req->r_pagelist) {
2394 struct ceph_pagelist *pagelist = req->r_pagelist;
2395 ceph_msg_data_add_pagelist(msg, pagelist);
2396 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2398 msg->hdr.data_len = 0;
2401 msg->hdr.data_off = cpu_to_le16(0);
2405 ceph_mdsc_free_path((char *)path2, pathlen2);
2408 ceph_mdsc_free_path((char *)path1, pathlen1);
2414 * called under mdsc->mutex if error, under no mutex if
2417 static void complete_request(struct ceph_mds_client *mdsc,
2418 struct ceph_mds_request *req)
2420 if (req->r_callback)
2421 req->r_callback(mdsc, req);
2422 complete_all(&req->r_completion);
2426 * called under mdsc->mutex
2428 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2429 struct ceph_mds_request *req,
2430 int mds, bool drop_cap_releases)
2432 struct ceph_mds_request_head *rhead;
2433 struct ceph_msg *msg;
2438 struct ceph_cap *cap =
2439 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2442 req->r_sent_on_mseq = cap->mseq;
2444 req->r_sent_on_mseq = -1;
2446 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2447 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2449 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2452 * Replay. Do not regenerate message (and rebuild
2453 * paths, etc.); just use the original message.
2454 * Rebuilding paths will break for renames because
2455 * d_move mangles the src name.
2457 msg = req->r_request;
2458 rhead = msg->front.iov_base;
2460 flags = le32_to_cpu(rhead->flags);
2461 flags |= CEPH_MDS_FLAG_REPLAY;
2462 rhead->flags = cpu_to_le32(flags);
2464 if (req->r_target_inode)
2465 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2467 rhead->num_retry = req->r_attempts - 1;
2469 /* remove cap/dentry releases from message */
2470 rhead->num_releases = 0;
2473 p = msg->front.iov_base + req->r_request_release_offset;
2475 struct ceph_timespec ts;
2476 ceph_encode_timespec64(&ts, &req->r_stamp);
2477 ceph_encode_copy(&p, &ts, sizeof(ts));
2480 msg->front.iov_len = p - msg->front.iov_base;
2481 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2485 if (req->r_request) {
2486 ceph_msg_put(req->r_request);
2487 req->r_request = NULL;
2489 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2491 req->r_err = PTR_ERR(msg);
2492 return PTR_ERR(msg);
2494 req->r_request = msg;
2496 rhead = msg->front.iov_base;
2497 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2498 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2499 flags |= CEPH_MDS_FLAG_REPLAY;
2501 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2502 rhead->flags = cpu_to_le32(flags);
2503 rhead->num_fwd = req->r_num_fwd;
2504 rhead->num_retry = req->r_attempts - 1;
2507 dout(" r_parent = %p\n", req->r_parent);
2512 * send request, or put it on the appropriate wait list.
2514 static void __do_request(struct ceph_mds_client *mdsc,
2515 struct ceph_mds_request *req)
2517 struct ceph_mds_session *session = NULL;
2521 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2522 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2523 __unregister_request(mdsc, req);
2527 if (req->r_timeout &&
2528 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2529 dout("do_request timed out\n");
2533 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2534 dout("do_request forced umount\n");
2538 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2539 if (mdsc->mdsmap_err) {
2540 err = mdsc->mdsmap_err;
2541 dout("do_request mdsmap err %d\n", err);
2544 if (mdsc->mdsmap->m_epoch == 0) {
2545 dout("do_request no mdsmap, waiting for map\n");
2546 list_add(&req->r_wait, &mdsc->waiting_for_map);
2549 if (!(mdsc->fsc->mount_options->flags &
2550 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2551 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2553 pr_info("probably no mds server is up\n");
2558 put_request_session(req);
2560 mds = __choose_mds(mdsc, req);
2562 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2563 dout("do_request no mds or not active, waiting for map\n");
2564 list_add(&req->r_wait, &mdsc->waiting_for_map);
2568 /* get, open session */
2569 session = __ceph_lookup_mds_session(mdsc, mds);
2571 session = register_session(mdsc, mds);
2572 if (IS_ERR(session)) {
2573 err = PTR_ERR(session);
2577 req->r_session = get_session(session);
2579 dout("do_request mds%d session %p state %s\n", mds, session,
2580 ceph_session_state_name(session->s_state));
2581 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2582 session->s_state != CEPH_MDS_SESSION_HUNG) {
2583 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2587 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2588 session->s_state == CEPH_MDS_SESSION_CLOSING)
2589 __open_session(mdsc, session);
2590 list_add(&req->r_wait, &session->s_waiting);
2595 req->r_resend_mds = -1; /* forget any previous mds hint */
2597 if (req->r_request_started == 0) /* note request start time */
2598 req->r_request_started = jiffies;
2600 err = __prepare_send_request(mdsc, req, mds, false);
2602 ceph_msg_get(req->r_request);
2603 ceph_con_send(&session->s_con, req->r_request);
2607 ceph_put_mds_session(session);
2610 dout("__do_request early error %d\n", err);
2612 complete_request(mdsc, req);
2613 __unregister_request(mdsc, req);
2619 * called under mdsc->mutex
2621 static void __wake_requests(struct ceph_mds_client *mdsc,
2622 struct list_head *head)
2624 struct ceph_mds_request *req;
2625 LIST_HEAD(tmp_list);
2627 list_splice_init(head, &tmp_list);
2629 while (!list_empty(&tmp_list)) {
2630 req = list_entry(tmp_list.next,
2631 struct ceph_mds_request, r_wait);
2632 list_del_init(&req->r_wait);
2633 dout(" wake request %p tid %llu\n", req, req->r_tid);
2634 __do_request(mdsc, req);
2639 * Wake up threads with requests pending for @mds, so that they can
2640 * resubmit their requests to a possibly different mds.
2642 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2644 struct ceph_mds_request *req;
2645 struct rb_node *p = rb_first(&mdsc->request_tree);
2647 dout("kick_requests mds%d\n", mds);
2649 req = rb_entry(p, struct ceph_mds_request, r_node);
2651 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2653 if (req->r_attempts > 0)
2654 continue; /* only new requests */
2655 if (req->r_session &&
2656 req->r_session->s_mds == mds) {
2657 dout(" kicking tid %llu\n", req->r_tid);
2658 list_del_init(&req->r_wait);
2659 __do_request(mdsc, req);
2664 int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, struct inode *dir,
2665 struct ceph_mds_request *req)
2669 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2671 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2673 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2674 if (req->r_old_dentry_dir)
2675 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2678 dout("submit_request on %p for inode %p\n", req, dir);
2679 mutex_lock(&mdsc->mutex);
2680 __register_request(mdsc, req, dir);
2681 __do_request(mdsc, req);
2683 mutex_unlock(&mdsc->mutex);
2687 static int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
2688 struct ceph_mds_request *req)
2693 dout("do_request waiting\n");
2694 if (!req->r_timeout && req->r_wait_for_completion) {
2695 err = req->r_wait_for_completion(mdsc, req);
2697 long timeleft = wait_for_completion_killable_timeout(
2699 ceph_timeout_jiffies(req->r_timeout));
2703 err = -EIO; /* timed out */
2705 err = timeleft; /* killed */
2707 dout("do_request waited, got %d\n", err);
2708 mutex_lock(&mdsc->mutex);
2710 /* only abort if we didn't race with a real reply */
2711 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2712 err = le32_to_cpu(req->r_reply_info.head->result);
2713 } else if (err < 0) {
2714 dout("aborted request %lld with %d\n", req->r_tid, err);
2717 * ensure we aren't running concurrently with
2718 * ceph_fill_trace or ceph_readdir_prepopulate, which
2719 * rely on locks (dir mutex) held by our caller.
2721 mutex_lock(&req->r_fill_mutex);
2723 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2724 mutex_unlock(&req->r_fill_mutex);
2726 if (req->r_parent &&
2727 (req->r_op & CEPH_MDS_OP_WRITE))
2728 ceph_invalidate_dir_request(req);
2733 mutex_unlock(&mdsc->mutex);
2738 * Synchrously perform an mds request. Take care of all of the
2739 * session setup, forwarding, retry details.
2741 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2743 struct ceph_mds_request *req)
2747 dout("do_request on %p\n", req);
2750 err = ceph_mdsc_submit_request(mdsc, dir, req);
2752 err = ceph_mdsc_wait_request(mdsc, req);
2753 dout("do_request %p done, result %d\n", req, err);
2758 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2759 * namespace request.
2761 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2763 struct inode *dir = req->r_parent;
2764 struct inode *old_dir = req->r_old_dentry_dir;
2766 dout("invalidate_dir_request %p %p (complete, lease(s))\n", dir, old_dir);
2768 ceph_dir_clear_complete(dir);
2770 ceph_dir_clear_complete(old_dir);
2772 ceph_invalidate_dentry_lease(req->r_dentry);
2773 if (req->r_old_dentry)
2774 ceph_invalidate_dentry_lease(req->r_old_dentry);
2780 * We take the session mutex and parse and process the reply immediately.
2781 * This preserves the logical ordering of replies, capabilities, etc., sent
2782 * by the MDS as they are applied to our local cache.
2784 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2786 struct ceph_mds_client *mdsc = session->s_mdsc;
2787 struct ceph_mds_request *req;
2788 struct ceph_mds_reply_head *head = msg->front.iov_base;
2789 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2790 struct ceph_snap_realm *realm;
2793 int mds = session->s_mds;
2795 if (msg->front.iov_len < sizeof(*head)) {
2796 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2801 /* get request, session */
2802 tid = le64_to_cpu(msg->hdr.tid);
2803 mutex_lock(&mdsc->mutex);
2804 req = lookup_get_request(mdsc, tid);
2806 dout("handle_reply on unknown tid %llu\n", tid);
2807 mutex_unlock(&mdsc->mutex);
2810 dout("handle_reply %p\n", req);
2812 /* correct session? */
2813 if (req->r_session != session) {
2814 pr_err("mdsc_handle_reply got %llu on session mds%d"
2815 " not mds%d\n", tid, session->s_mds,
2816 req->r_session ? req->r_session->s_mds : -1);
2817 mutex_unlock(&mdsc->mutex);
2822 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2823 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2824 pr_warn("got a dup %s reply on %llu from mds%d\n",
2825 head->safe ? "safe" : "unsafe", tid, mds);
2826 mutex_unlock(&mdsc->mutex);
2829 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2830 pr_warn("got unsafe after safe on %llu from mds%d\n",
2832 mutex_unlock(&mdsc->mutex);
2836 result = le32_to_cpu(head->result);
2840 * if we're not talking to the authority, send to them
2841 * if the authority has changed while we weren't looking,
2842 * send to new authority
2843 * Otherwise we just have to return an ESTALE
2845 if (result == -ESTALE) {
2846 dout("got ESTALE on request %llu\n", req->r_tid);
2847 req->r_resend_mds = -1;
2848 if (req->r_direct_mode != USE_AUTH_MDS) {
2849 dout("not using auth, setting for that now\n");
2850 req->r_direct_mode = USE_AUTH_MDS;
2851 __do_request(mdsc, req);
2852 mutex_unlock(&mdsc->mutex);
2855 int mds = __choose_mds(mdsc, req);
2856 if (mds >= 0 && mds != req->r_session->s_mds) {
2857 dout("but auth changed, so resending\n");
2858 __do_request(mdsc, req);
2859 mutex_unlock(&mdsc->mutex);
2863 dout("have to return ESTALE on request %llu\n", req->r_tid);
2868 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2869 __unregister_request(mdsc, req);
2871 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2873 * We already handled the unsafe response, now do the
2874 * cleanup. No need to examine the response; the MDS
2875 * doesn't include any result info in the safe
2876 * response. And even if it did, there is nothing
2877 * useful we could do with a revised return value.
2879 dout("got safe reply %llu, mds%d\n", tid, mds);
2881 /* last unsafe request during umount? */
2882 if (mdsc->stopping && !__get_oldest_req(mdsc))
2883 complete_all(&mdsc->safe_umount_waiters);
2884 mutex_unlock(&mdsc->mutex);
2888 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2889 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2890 if (req->r_unsafe_dir) {
2891 struct ceph_inode_info *ci =
2892 ceph_inode(req->r_unsafe_dir);
2893 spin_lock(&ci->i_unsafe_lock);
2894 list_add_tail(&req->r_unsafe_dir_item,
2895 &ci->i_unsafe_dirops);
2896 spin_unlock(&ci->i_unsafe_lock);
2900 dout("handle_reply tid %lld result %d\n", tid, result);
2901 rinfo = &req->r_reply_info;
2902 if (test_bit(CEPHFS_FEATURE_REPLY_ENCODING, &session->s_features))
2903 err = parse_reply_info(msg, rinfo, (u64)-1);
2905 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2906 mutex_unlock(&mdsc->mutex);
2908 mutex_lock(&session->s_mutex);
2910 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2917 if (rinfo->snapblob_len) {
2918 down_write(&mdsc->snap_rwsem);
2919 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2920 rinfo->snapblob + rinfo->snapblob_len,
2921 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2923 downgrade_write(&mdsc->snap_rwsem);
2925 down_read(&mdsc->snap_rwsem);
2928 /* insert trace into our cache */
2929 mutex_lock(&req->r_fill_mutex);
2930 current->journal_info = req;
2931 err = ceph_fill_trace(mdsc->fsc->sb, req);
2933 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2934 req->r_op == CEPH_MDS_OP_LSSNAP))
2935 ceph_readdir_prepopulate(req, req->r_session);
2937 current->journal_info = NULL;
2938 mutex_unlock(&req->r_fill_mutex);
2940 up_read(&mdsc->snap_rwsem);
2942 ceph_put_snap_realm(mdsc, realm);
2945 if (req->r_target_inode &&
2946 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2947 struct ceph_inode_info *ci =
2948 ceph_inode(req->r_target_inode);
2949 spin_lock(&ci->i_unsafe_lock);
2950 list_add_tail(&req->r_unsafe_target_item,
2951 &ci->i_unsafe_iops);
2952 spin_unlock(&ci->i_unsafe_lock);
2955 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2958 mutex_lock(&mdsc->mutex);
2959 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2963 req->r_reply = ceph_msg_get(msg);
2964 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2967 dout("reply arrived after request %lld was aborted\n", tid);
2969 mutex_unlock(&mdsc->mutex);
2971 mutex_unlock(&session->s_mutex);
2973 /* kick calling process */
2974 complete_request(mdsc, req);
2976 ceph_mdsc_put_request(req);
2983 * handle mds notification that our request has been forwarded.
2985 static void handle_forward(struct ceph_mds_client *mdsc,
2986 struct ceph_mds_session *session,
2987 struct ceph_msg *msg)
2989 struct ceph_mds_request *req;
2990 u64 tid = le64_to_cpu(msg->hdr.tid);
2994 void *p = msg->front.iov_base;
2995 void *end = p + msg->front.iov_len;
2997 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2998 next_mds = ceph_decode_32(&p);
2999 fwd_seq = ceph_decode_32(&p);
3001 mutex_lock(&mdsc->mutex);
3002 req = lookup_get_request(mdsc, tid);
3004 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
3005 goto out; /* dup reply? */
3008 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
3009 dout("forward tid %llu aborted, unregistering\n", tid);
3010 __unregister_request(mdsc, req);
3011 } else if (fwd_seq <= req->r_num_fwd) {
3012 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
3013 tid, next_mds, req->r_num_fwd, fwd_seq);
3015 /* resend. forward race not possible; mds would drop */
3016 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
3018 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
3019 req->r_attempts = 0;
3020 req->r_num_fwd = fwd_seq;
3021 req->r_resend_mds = next_mds;
3022 put_request_session(req);
3023 __do_request(mdsc, req);
3025 ceph_mdsc_put_request(req);
3027 mutex_unlock(&mdsc->mutex);
3031 pr_err("mdsc_handle_forward decode error err=%d\n", err);
3034 static int __decode_session_metadata(void **p, void *end,
3037 /* map<string,string> */
3040 ceph_decode_32_safe(p, end, n, bad);
3043 ceph_decode_32_safe(p, end, len, bad);
3044 ceph_decode_need(p, end, len, bad);
3045 err_str = !strncmp(*p, "error_string", len);
3047 ceph_decode_32_safe(p, end, len, bad);
3048 ceph_decode_need(p, end, len, bad);
3049 if (err_str && strnstr(*p, "blacklisted", len))
3050 *blacklisted = true;
3059 * handle a mds session control message
3061 static void handle_session(struct ceph_mds_session *session,
3062 struct ceph_msg *msg)
3064 struct ceph_mds_client *mdsc = session->s_mdsc;
3065 int mds = session->s_mds;
3066 int msg_version = le16_to_cpu(msg->hdr.version);
3067 void *p = msg->front.iov_base;
3068 void *end = p + msg->front.iov_len;
3069 struct ceph_mds_session_head *h;
3072 unsigned long features = 0;
3074 bool blacklisted = false;
3077 ceph_decode_need(&p, end, sizeof(*h), bad);
3081 op = le32_to_cpu(h->op);
3082 seq = le64_to_cpu(h->seq);
3084 if (msg_version >= 3) {
3086 /* version >= 2, metadata */
3087 if (__decode_session_metadata(&p, end, &blacklisted) < 0)
3089 /* version >= 3, feature bits */
3090 ceph_decode_32_safe(&p, end, len, bad);
3091 ceph_decode_need(&p, end, len, bad);
3092 memcpy(&features, p, min_t(size_t, len, sizeof(features)));
3096 mutex_lock(&mdsc->mutex);
3097 if (op == CEPH_SESSION_CLOSE) {
3098 get_session(session);
3099 __unregister_session(mdsc, session);
3101 /* FIXME: this ttl calculation is generous */
3102 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
3103 mutex_unlock(&mdsc->mutex);
3105 mutex_lock(&session->s_mutex);
3107 dout("handle_session mds%d %s %p state %s seq %llu\n",
3108 mds, ceph_session_op_name(op), session,
3109 ceph_session_state_name(session->s_state), seq);
3111 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
3112 session->s_state = CEPH_MDS_SESSION_OPEN;
3113 pr_info("mds%d came back\n", session->s_mds);
3117 case CEPH_SESSION_OPEN:
3118 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3119 pr_info("mds%d reconnect success\n", session->s_mds);
3120 session->s_state = CEPH_MDS_SESSION_OPEN;
3121 session->s_features = features;
3122 renewed_caps(mdsc, session, 0);
3125 __close_session(mdsc, session);
3128 case CEPH_SESSION_RENEWCAPS:
3129 if (session->s_renew_seq == seq)
3130 renewed_caps(mdsc, session, 1);
3133 case CEPH_SESSION_CLOSE:
3134 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
3135 pr_info("mds%d reconnect denied\n", session->s_mds);
3136 cleanup_session_requests(mdsc, session);
3137 remove_session_caps(session);
3138 wake = 2; /* for good measure */
3139 wake_up_all(&mdsc->session_close_wq);
3142 case CEPH_SESSION_STALE:
3143 pr_info("mds%d caps went stale, renewing\n",
3145 spin_lock(&session->s_gen_ttl_lock);
3146 session->s_cap_gen++;
3147 session->s_cap_ttl = jiffies - 1;
3148 spin_unlock(&session->s_gen_ttl_lock);
3149 send_renew_caps(mdsc, session);
3152 case CEPH_SESSION_RECALL_STATE:
3153 ceph_trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
3156 case CEPH_SESSION_FLUSHMSG:
3157 send_flushmsg_ack(mdsc, session, seq);
3160 case CEPH_SESSION_FORCE_RO:
3161 dout("force_session_readonly %p\n", session);
3162 spin_lock(&session->s_cap_lock);
3163 session->s_readonly = true;
3164 spin_unlock(&session->s_cap_lock);
3165 wake_up_session_caps(session, FORCE_RO);
3168 case CEPH_SESSION_REJECT:
3169 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
3170 pr_info("mds%d rejected session\n", session->s_mds);
3171 session->s_state = CEPH_MDS_SESSION_REJECTED;
3172 cleanup_session_requests(mdsc, session);
3173 remove_session_caps(session);
3175 mdsc->fsc->blacklisted = true;
3176 wake = 2; /* for good measure */
3180 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
3184 mutex_unlock(&session->s_mutex);
3186 mutex_lock(&mdsc->mutex);
3187 __wake_requests(mdsc, &session->s_waiting);
3189 kick_requests(mdsc, mds);
3190 mutex_unlock(&mdsc->mutex);
3192 if (op == CEPH_SESSION_CLOSE)
3193 ceph_put_mds_session(session);
3197 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
3198 (int)msg->front.iov_len);
3205 * called under session->mutex.
3207 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
3208 struct ceph_mds_session *session)
3210 struct ceph_mds_request *req, *nreq;
3214 dout("replay_unsafe_requests mds%d\n", session->s_mds);
3216 mutex_lock(&mdsc->mutex);
3217 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
3218 err = __prepare_send_request(mdsc, req, session->s_mds, true);
3220 ceph_msg_get(req->r_request);
3221 ceph_con_send(&session->s_con, req->r_request);
3226 * also re-send old requests when MDS enters reconnect stage. So that MDS
3227 * can process completed request in clientreplay stage.
3229 p = rb_first(&mdsc->request_tree);
3231 req = rb_entry(p, struct ceph_mds_request, r_node);
3233 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
3235 if (req->r_attempts == 0)
3236 continue; /* only old requests */
3237 if (req->r_session &&
3238 req->r_session->s_mds == session->s_mds) {
3239 err = __prepare_send_request(mdsc, req,
3240 session->s_mds, true);
3242 ceph_msg_get(req->r_request);
3243 ceph_con_send(&session->s_con, req->r_request);
3247 mutex_unlock(&mdsc->mutex);
3250 static int send_reconnect_partial(struct ceph_reconnect_state *recon_state)
3252 struct ceph_msg *reply;
3253 struct ceph_pagelist *_pagelist;
3258 if (!recon_state->allow_multi)
3261 /* can't handle message that contains both caps and realm */
3262 BUG_ON(!recon_state->nr_caps == !recon_state->nr_realms);
3264 /* pre-allocate new pagelist */
3265 _pagelist = ceph_pagelist_alloc(GFP_NOFS);
3269 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3273 /* placeholder for nr_caps */
3274 err = ceph_pagelist_encode_32(_pagelist, 0);
3278 if (recon_state->nr_caps) {
3279 /* currently encoding caps */
3280 err = ceph_pagelist_encode_32(recon_state->pagelist, 0);
3284 /* placeholder for nr_realms (currently encoding relams) */
3285 err = ceph_pagelist_encode_32(_pagelist, 0);
3290 err = ceph_pagelist_encode_8(recon_state->pagelist, 1);
3294 page = list_first_entry(&recon_state->pagelist->head, struct page, lru);
3295 addr = kmap_atomic(page);
3296 if (recon_state->nr_caps) {
3297 /* currently encoding caps */
3298 *addr = cpu_to_le32(recon_state->nr_caps);
3300 /* currently encoding relams */
3301 *(addr + 1) = cpu_to_le32(recon_state->nr_realms);
3303 kunmap_atomic(addr);
3305 reply->hdr.version = cpu_to_le16(5);
3306 reply->hdr.compat_version = cpu_to_le16(4);
3308 reply->hdr.data_len = cpu_to_le32(recon_state->pagelist->length);
3309 ceph_msg_data_add_pagelist(reply, recon_state->pagelist);
3311 ceph_con_send(&recon_state->session->s_con, reply);
3312 ceph_pagelist_release(recon_state->pagelist);
3314 recon_state->pagelist = _pagelist;
3315 recon_state->nr_caps = 0;
3316 recon_state->nr_realms = 0;
3317 recon_state->msg_version = 5;
3320 ceph_msg_put(reply);
3322 ceph_pagelist_release(_pagelist);
3327 * Encode information about a cap for a reconnect with the MDS.
3329 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
3333 struct ceph_mds_cap_reconnect v2;
3334 struct ceph_mds_cap_reconnect_v1 v1;
3336 struct ceph_inode_info *ci = cap->ci;
3337 struct ceph_reconnect_state *recon_state = arg;
3338 struct ceph_pagelist *pagelist = recon_state->pagelist;
3342 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
3343 inode, ceph_vinop(inode), cap, cap->cap_id,
3344 ceph_cap_string(cap->issued));
3346 spin_lock(&ci->i_ceph_lock);
3347 cap->seq = 0; /* reset cap seq */
3348 cap->issue_seq = 0; /* and issue_seq */
3349 cap->mseq = 0; /* and migrate_seq */
3350 cap->cap_gen = cap->session->s_cap_gen;
3352 if (recon_state->msg_version >= 2) {
3353 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
3354 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3355 rec.v2.issued = cpu_to_le32(cap->issued);
3356 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3357 rec.v2.pathbase = 0;
3358 rec.v2.flock_len = (__force __le32)
3359 ((ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK) ? 0 : 1);
3361 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
3362 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
3363 rec.v1.issued = cpu_to_le32(cap->issued);
3364 rec.v1.size = cpu_to_le64(inode->i_size);
3365 ceph_encode_timespec64(&rec.v1.mtime, &inode->i_mtime);
3366 ceph_encode_timespec64(&rec.v1.atime, &inode->i_atime);
3367 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
3368 rec.v1.pathbase = 0;
3371 if (list_empty(&ci->i_cap_snaps)) {
3372 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
3374 struct ceph_cap_snap *capsnap =
3375 list_first_entry(&ci->i_cap_snaps,
3376 struct ceph_cap_snap, ci_item);
3377 snap_follows = capsnap->follows;
3379 spin_unlock(&ci->i_ceph_lock);
3381 if (recon_state->msg_version >= 2) {
3382 int num_fcntl_locks, num_flock_locks;
3383 struct ceph_filelock *flocks = NULL;
3384 size_t struct_len, total_len = sizeof(u64);
3388 if (rec.v2.flock_len) {
3389 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
3391 num_fcntl_locks = 0;
3392 num_flock_locks = 0;
3394 if (num_fcntl_locks + num_flock_locks > 0) {
3395 flocks = kmalloc_array(num_fcntl_locks + num_flock_locks,
3396 sizeof(struct ceph_filelock),
3402 err = ceph_encode_locks_to_buffer(inode, flocks,
3417 if (recon_state->msg_version >= 3) {
3418 /* version, compat_version and struct_len */
3419 total_len += 2 * sizeof(u8) + sizeof(u32);
3423 * number of encoded locks is stable, so copy to pagelist
3425 struct_len = 2 * sizeof(u32) +
3426 (num_fcntl_locks + num_flock_locks) *
3427 sizeof(struct ceph_filelock);
3428 rec.v2.flock_len = cpu_to_le32(struct_len);
3430 struct_len += sizeof(u32) + sizeof(rec.v2);
3433 struct_len += sizeof(u64); /* snap_follows */
3435 total_len += struct_len;
3437 if (pagelist->length + total_len > RECONNECT_MAX_SIZE) {
3438 err = send_reconnect_partial(recon_state);
3440 goto out_freeflocks;
3441 pagelist = recon_state->pagelist;
3444 err = ceph_pagelist_reserve(pagelist, total_len);
3446 goto out_freeflocks;
3448 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3449 if (recon_state->msg_version >= 3) {
3450 ceph_pagelist_encode_8(pagelist, struct_v);
3451 ceph_pagelist_encode_8(pagelist, 1);
3452 ceph_pagelist_encode_32(pagelist, struct_len);
3454 ceph_pagelist_encode_string(pagelist, NULL, 0);
3455 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
3456 ceph_locks_to_pagelist(flocks, pagelist,
3457 num_fcntl_locks, num_flock_locks);
3459 ceph_pagelist_encode_64(pagelist, snap_follows);
3466 struct dentry *dentry;
3468 dentry = d_find_alias(inode);
3470 path = ceph_mdsc_build_path(dentry,
3471 &pathlen, &pathbase, 0);
3474 err = PTR_ERR(path);
3477 rec.v1.pathbase = cpu_to_le64(pathbase);
3480 err = ceph_pagelist_reserve(pagelist,
3481 sizeof(u64) + sizeof(u32) +
3482 pathlen + sizeof(rec.v1));
3487 ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
3488 ceph_pagelist_encode_string(pagelist, path, pathlen);
3489 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
3491 ceph_mdsc_free_path(path, pathlen);
3496 recon_state->nr_caps++;
3500 static int encode_snap_realms(struct ceph_mds_client *mdsc,
3501 struct ceph_reconnect_state *recon_state)
3504 struct ceph_pagelist *pagelist = recon_state->pagelist;
3507 if (recon_state->msg_version >= 4) {
3508 err = ceph_pagelist_encode_32(pagelist, mdsc->num_snap_realms);
3514 * snaprealms. we provide mds with the ino, seq (version), and
3515 * parent for all of our realms. If the mds has any newer info,
3518 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3519 struct ceph_snap_realm *realm =
3520 rb_entry(p, struct ceph_snap_realm, node);
3521 struct ceph_mds_snaprealm_reconnect sr_rec;
3523 if (recon_state->msg_version >= 4) {
3524 size_t need = sizeof(u8) * 2 + sizeof(u32) +
3527 if (pagelist->length + need > RECONNECT_MAX_SIZE) {
3528 err = send_reconnect_partial(recon_state);
3531 pagelist = recon_state->pagelist;
3534 err = ceph_pagelist_reserve(pagelist, need);
3538 ceph_pagelist_encode_8(pagelist, 1);
3539 ceph_pagelist_encode_8(pagelist, 1);
3540 ceph_pagelist_encode_32(pagelist, sizeof(sr_rec));
3543 dout(" adding snap realm %llx seq %lld parent %llx\n",
3544 realm->ino, realm->seq, realm->parent_ino);
3545 sr_rec.ino = cpu_to_le64(realm->ino);
3546 sr_rec.seq = cpu_to_le64(realm->seq);
3547 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3549 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3553 recon_state->nr_realms++;
3561 * If an MDS fails and recovers, clients need to reconnect in order to
3562 * reestablish shared state. This includes all caps issued through
3563 * this session _and_ the snap_realm hierarchy. Because it's not
3564 * clear which snap realms the mds cares about, we send everything we
3565 * know about.. that ensures we'll then get any new info the
3566 * recovering MDS might have.
3568 * This is a relatively heavyweight operation, but it's rare.
3570 * called with mdsc->mutex held.
3572 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
3573 struct ceph_mds_session *session)
3575 struct ceph_msg *reply;
3576 int mds = session->s_mds;
3578 struct ceph_reconnect_state recon_state = {
3583 pr_info("mds%d reconnect start\n", mds);
3585 recon_state.pagelist = ceph_pagelist_alloc(GFP_NOFS);
3586 if (!recon_state.pagelist)
3587 goto fail_nopagelist;
3589 reply = ceph_msg_new2(CEPH_MSG_CLIENT_RECONNECT, 0, 1, GFP_NOFS, false);
3593 mutex_lock(&session->s_mutex);
3594 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3597 dout("session %p state %s\n", session,
3598 ceph_session_state_name(session->s_state));
3600 spin_lock(&session->s_gen_ttl_lock);
3601 session->s_cap_gen++;
3602 spin_unlock(&session->s_gen_ttl_lock);
3604 spin_lock(&session->s_cap_lock);
3605 /* don't know if session is readonly */
3606 session->s_readonly = 0;
3608 * notify __ceph_remove_cap() that we are composing cap reconnect.
3609 * If a cap get released before being added to the cap reconnect,
3610 * __ceph_remove_cap() should skip queuing cap release.
3612 session->s_cap_reconnect = 1;
3613 /* drop old cap expires; we're about to reestablish that state */
3614 detach_cap_releases(session, &dispose);
3615 spin_unlock(&session->s_cap_lock);
3616 dispose_cap_releases(mdsc, &dispose);
3618 /* trim unused caps to reduce MDS's cache rejoin time */
3619 if (mdsc->fsc->sb->s_root)
3620 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3622 ceph_con_close(&session->s_con);
3623 ceph_con_open(&session->s_con,
3624 CEPH_ENTITY_TYPE_MDS, mds,
3625 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3627 /* replay unsafe requests */
3628 replay_unsafe_requests(mdsc, session);
3630 ceph_early_kick_flushing_caps(mdsc, session);
3632 down_read(&mdsc->snap_rwsem);
3634 /* placeholder for nr_caps */
3635 err = ceph_pagelist_encode_32(recon_state.pagelist, 0);
3639 if (test_bit(CEPHFS_FEATURE_MULTI_RECONNECT, &session->s_features)) {
3640 recon_state.msg_version = 3;
3641 recon_state.allow_multi = true;
3642 } else if (session->s_con.peer_features & CEPH_FEATURE_MDSENC) {
3643 recon_state.msg_version = 3;
3645 recon_state.msg_version = 2;
3647 /* trsaverse this session's caps */
3648 err = ceph_iterate_session_caps(session, encode_caps_cb, &recon_state);
3650 spin_lock(&session->s_cap_lock);
3651 session->s_cap_reconnect = 0;
3652 spin_unlock(&session->s_cap_lock);
3657 /* check if all realms can be encoded into current message */
3658 if (mdsc->num_snap_realms) {
3660 recon_state.pagelist->length +
3661 mdsc->num_snap_realms *
3662 sizeof(struct ceph_mds_snaprealm_reconnect);
3663 if (recon_state.msg_version >= 4) {
3664 /* number of realms */
3665 total_len += sizeof(u32);
3666 /* version, compat_version and struct_len */
3667 total_len += mdsc->num_snap_realms *
3668 (2 * sizeof(u8) + sizeof(u32));
3670 if (total_len > RECONNECT_MAX_SIZE) {
3671 if (!recon_state.allow_multi) {
3675 if (recon_state.nr_caps) {
3676 err = send_reconnect_partial(&recon_state);
3680 recon_state.msg_version = 5;
3684 err = encode_snap_realms(mdsc, &recon_state);
3688 if (recon_state.msg_version >= 5) {
3689 err = ceph_pagelist_encode_8(recon_state.pagelist, 0);
3694 if (recon_state.nr_caps || recon_state.nr_realms) {
3696 list_first_entry(&recon_state.pagelist->head,
3698 __le32 *addr = kmap_atomic(page);
3699 if (recon_state.nr_caps) {
3700 WARN_ON(recon_state.nr_realms != mdsc->num_snap_realms);
3701 *addr = cpu_to_le32(recon_state.nr_caps);
3702 } else if (recon_state.msg_version >= 4) {
3703 *(addr + 1) = cpu_to_le32(recon_state.nr_realms);
3705 kunmap_atomic(addr);
3708 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3709 if (recon_state.msg_version >= 4)
3710 reply->hdr.compat_version = cpu_to_le16(4);
3712 reply->hdr.data_len = cpu_to_le32(recon_state.pagelist->length);
3713 ceph_msg_data_add_pagelist(reply, recon_state.pagelist);
3715 ceph_con_send(&session->s_con, reply);
3717 mutex_unlock(&session->s_mutex);
3719 mutex_lock(&mdsc->mutex);
3720 __wake_requests(mdsc, &session->s_waiting);
3721 mutex_unlock(&mdsc->mutex);
3723 up_read(&mdsc->snap_rwsem);
3724 ceph_pagelist_release(recon_state.pagelist);
3728 ceph_msg_put(reply);
3729 up_read(&mdsc->snap_rwsem);
3730 mutex_unlock(&session->s_mutex);
3732 ceph_pagelist_release(recon_state.pagelist);
3734 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3740 * compare old and new mdsmaps, kicking requests
3741 * and closing out old connections as necessary
3743 * called under mdsc->mutex.
3745 static void check_new_map(struct ceph_mds_client *mdsc,
3746 struct ceph_mdsmap *newmap,
3747 struct ceph_mdsmap *oldmap)
3750 int oldstate, newstate;
3751 struct ceph_mds_session *s;
3753 dout("check_new_map new %u old %u\n",
3754 newmap->m_epoch, oldmap->m_epoch);
3756 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3757 if (!mdsc->sessions[i])
3759 s = mdsc->sessions[i];
3760 oldstate = ceph_mdsmap_get_state(oldmap, i);
3761 newstate = ceph_mdsmap_get_state(newmap, i);
3763 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3764 i, ceph_mds_state_name(oldstate),
3765 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3766 ceph_mds_state_name(newstate),
3767 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3768 ceph_session_state_name(s->s_state));
3770 if (i >= newmap->m_num_mds) {
3771 /* force close session for stopped mds */
3773 __unregister_session(mdsc, s);
3774 __wake_requests(mdsc, &s->s_waiting);
3775 mutex_unlock(&mdsc->mutex);
3777 mutex_lock(&s->s_mutex);
3778 cleanup_session_requests(mdsc, s);
3779 remove_session_caps(s);
3780 mutex_unlock(&s->s_mutex);
3782 ceph_put_mds_session(s);
3784 mutex_lock(&mdsc->mutex);
3785 kick_requests(mdsc, i);
3789 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
3790 ceph_mdsmap_get_addr(newmap, i),
3791 sizeof(struct ceph_entity_addr))) {
3793 mutex_unlock(&mdsc->mutex);
3794 mutex_lock(&s->s_mutex);
3795 mutex_lock(&mdsc->mutex);
3796 ceph_con_close(&s->s_con);
3797 mutex_unlock(&s->s_mutex);
3798 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3799 } else if (oldstate == newstate) {
3800 continue; /* nothing new with this mds */
3806 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3807 newstate >= CEPH_MDS_STATE_RECONNECT) {
3808 mutex_unlock(&mdsc->mutex);
3809 send_mds_reconnect(mdsc, s);
3810 mutex_lock(&mdsc->mutex);
3814 * kick request on any mds that has gone active.
3816 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3817 newstate >= CEPH_MDS_STATE_ACTIVE) {
3818 if (oldstate != CEPH_MDS_STATE_CREATING &&
3819 oldstate != CEPH_MDS_STATE_STARTING)
3820 pr_info("mds%d recovery completed\n", s->s_mds);
3821 kick_requests(mdsc, i);
3822 ceph_kick_flushing_caps(mdsc, s);
3823 wake_up_session_caps(s, RECONNECT);
3827 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3828 s = mdsc->sessions[i];
3831 if (!ceph_mdsmap_is_laggy(newmap, i))
3833 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3834 s->s_state == CEPH_MDS_SESSION_HUNG ||
3835 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3836 dout(" connecting to export targets of laggy mds%d\n",
3838 __open_export_target_sessions(mdsc, s);
3850 * caller must hold session s_mutex, dentry->d_lock
3852 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3854 struct ceph_dentry_info *di = ceph_dentry(dentry);
3856 ceph_put_mds_session(di->lease_session);
3857 di->lease_session = NULL;
3860 static void handle_lease(struct ceph_mds_client *mdsc,
3861 struct ceph_mds_session *session,
3862 struct ceph_msg *msg)
3864 struct super_block *sb = mdsc->fsc->sb;
3865 struct inode *inode;
3866 struct dentry *parent, *dentry;
3867 struct ceph_dentry_info *di;
3868 int mds = session->s_mds;
3869 struct ceph_mds_lease *h = msg->front.iov_base;
3871 struct ceph_vino vino;
3875 dout("handle_lease from mds%d\n", mds);
3878 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3880 vino.ino = le64_to_cpu(h->ino);
3881 vino.snap = CEPH_NOSNAP;
3882 seq = le32_to_cpu(h->seq);
3883 dname.len = get_unaligned_le32(h + 1);
3884 if (msg->front.iov_len < sizeof(*h) + sizeof(u32) + dname.len)
3886 dname.name = (void *)(h + 1) + sizeof(u32);
3889 inode = ceph_find_inode(sb, vino);
3890 dout("handle_lease %s, ino %llx %p %.*s\n",
3891 ceph_lease_op_name(h->action), vino.ino, inode,
3892 dname.len, dname.name);
3894 mutex_lock(&session->s_mutex);
3898 dout("handle_lease no inode %llx\n", vino.ino);
3903 parent = d_find_alias(inode);
3905 dout("no parent dentry on inode %p\n", inode);
3907 goto release; /* hrm... */
3909 dname.hash = full_name_hash(parent, dname.name, dname.len);
3910 dentry = d_lookup(parent, &dname);
3915 spin_lock(&dentry->d_lock);
3916 di = ceph_dentry(dentry);
3917 switch (h->action) {
3918 case CEPH_MDS_LEASE_REVOKE:
3919 if (di->lease_session == session) {
3920 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3921 h->seq = cpu_to_le32(di->lease_seq);
3922 __ceph_mdsc_drop_dentry_lease(dentry);
3927 case CEPH_MDS_LEASE_RENEW:
3928 if (di->lease_session == session &&
3929 di->lease_gen == session->s_cap_gen &&
3930 di->lease_renew_from &&
3931 di->lease_renew_after == 0) {
3932 unsigned long duration =
3933 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3935 di->lease_seq = seq;
3936 di->time = di->lease_renew_from + duration;
3937 di->lease_renew_after = di->lease_renew_from +
3939 di->lease_renew_from = 0;
3943 spin_unlock(&dentry->d_lock);
3950 /* let's just reuse the same message */
3951 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3953 ceph_con_send(&session->s_con, msg);
3956 mutex_unlock(&session->s_mutex);
3957 /* avoid calling iput_final() in mds dispatch threads */
3958 ceph_async_iput(inode);
3962 pr_err("corrupt lease message\n");
3966 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3967 struct dentry *dentry, char action,
3970 struct ceph_msg *msg;
3971 struct ceph_mds_lease *lease;
3973 int len = sizeof(*lease) + sizeof(u32) + NAME_MAX;
3975 dout("lease_send_msg identry %p %s to mds%d\n",
3976 dentry, ceph_lease_op_name(action), session->s_mds);
3978 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3981 lease = msg->front.iov_base;
3982 lease->action = action;
3983 lease->seq = cpu_to_le32(seq);
3985 spin_lock(&dentry->d_lock);
3986 dir = d_inode(dentry->d_parent);
3987 lease->ino = cpu_to_le64(ceph_ino(dir));
3988 lease->first = lease->last = cpu_to_le64(ceph_snap(dir));
3990 put_unaligned_le32(dentry->d_name.len, lease + 1);
3991 memcpy((void *)(lease + 1) + 4,
3992 dentry->d_name.name, dentry->d_name.len);
3993 spin_unlock(&dentry->d_lock);
3995 * if this is a preemptive lease RELEASE, no need to
3996 * flush request stream, since the actual request will
3999 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
4001 ceph_con_send(&session->s_con, msg);
4005 * lock unlock sessions, to wait ongoing session activities
4007 static void lock_unlock_sessions(struct ceph_mds_client *mdsc)
4011 mutex_lock(&mdsc->mutex);
4012 for (i = 0; i < mdsc->max_sessions; i++) {
4013 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4016 mutex_unlock(&mdsc->mutex);
4017 mutex_lock(&s->s_mutex);
4018 mutex_unlock(&s->s_mutex);
4019 ceph_put_mds_session(s);
4020 mutex_lock(&mdsc->mutex);
4022 mutex_unlock(&mdsc->mutex);
4025 static void maybe_recover_session(struct ceph_mds_client *mdsc)
4027 struct ceph_fs_client *fsc = mdsc->fsc;
4029 if (!ceph_test_mount_opt(fsc, CLEANRECOVER))
4032 if (READ_ONCE(fsc->mount_state) != CEPH_MOUNT_MOUNTED)
4035 if (!READ_ONCE(fsc->blacklisted))
4038 if (fsc->last_auto_reconnect &&
4039 time_before(jiffies, fsc->last_auto_reconnect + HZ * 60 * 30))
4042 pr_info("auto reconnect after blacklisted\n");
4043 fsc->last_auto_reconnect = jiffies;
4044 ceph_force_reconnect(fsc->sb);
4048 * delayed work -- periodically trim expired leases, renew caps with mds
4050 static void schedule_delayed(struct ceph_mds_client *mdsc)
4053 unsigned hz = round_jiffies_relative(HZ * delay);
4054 schedule_delayed_work(&mdsc->delayed_work, hz);
4057 static void delayed_work(struct work_struct *work)
4060 struct ceph_mds_client *mdsc =
4061 container_of(work, struct ceph_mds_client, delayed_work.work);
4065 dout("mdsc delayed_work\n");
4067 mutex_lock(&mdsc->mutex);
4068 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
4069 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
4070 mdsc->last_renew_caps);
4072 mdsc->last_renew_caps = jiffies;
4074 for (i = 0; i < mdsc->max_sessions; i++) {
4075 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
4078 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
4079 dout("resending session close request for mds%d\n",
4081 request_close_session(mdsc, s);
4082 ceph_put_mds_session(s);
4085 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
4086 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
4087 s->s_state = CEPH_MDS_SESSION_HUNG;
4088 pr_info("mds%d hung\n", s->s_mds);
4091 if (s->s_state == CEPH_MDS_SESSION_NEW ||
4092 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
4093 s->s_state == CEPH_MDS_SESSION_REJECTED) {
4094 /* this mds is failed or recovering, just wait */
4095 ceph_put_mds_session(s);
4098 mutex_unlock(&mdsc->mutex);
4100 mutex_lock(&s->s_mutex);
4102 send_renew_caps(mdsc, s);
4104 ceph_con_keepalive(&s->s_con);
4105 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
4106 s->s_state == CEPH_MDS_SESSION_HUNG)
4107 ceph_send_cap_releases(mdsc, s);
4108 mutex_unlock(&s->s_mutex);
4109 ceph_put_mds_session(s);
4111 mutex_lock(&mdsc->mutex);
4113 mutex_unlock(&mdsc->mutex);
4115 ceph_check_delayed_caps(mdsc);
4117 ceph_queue_cap_reclaim_work(mdsc);
4119 ceph_trim_snapid_map(mdsc);
4121 maybe_recover_session(mdsc);
4123 schedule_delayed(mdsc);
4126 int ceph_mdsc_init(struct ceph_fs_client *fsc)
4129 struct ceph_mds_client *mdsc;
4131 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
4135 mutex_init(&mdsc->mutex);
4136 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
4137 if (!mdsc->mdsmap) {
4143 init_completion(&mdsc->safe_umount_waiters);
4144 init_waitqueue_head(&mdsc->session_close_wq);
4145 INIT_LIST_HEAD(&mdsc->waiting_for_map);
4146 mdsc->sessions = NULL;
4147 atomic_set(&mdsc->num_sessions, 0);
4148 mdsc->max_sessions = 0;
4150 atomic64_set(&mdsc->quotarealms_count, 0);
4151 mdsc->quotarealms_inodes = RB_ROOT;
4152 mutex_init(&mdsc->quotarealms_inodes_mutex);
4153 mdsc->last_snap_seq = 0;
4154 init_rwsem(&mdsc->snap_rwsem);
4155 mdsc->snap_realms = RB_ROOT;
4156 INIT_LIST_HEAD(&mdsc->snap_empty);
4157 mdsc->num_snap_realms = 0;
4158 spin_lock_init(&mdsc->snap_empty_lock);
4160 mdsc->oldest_tid = 0;
4161 mdsc->request_tree = RB_ROOT;
4162 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
4163 mdsc->last_renew_caps = jiffies;
4164 INIT_LIST_HEAD(&mdsc->cap_delay_list);
4165 spin_lock_init(&mdsc->cap_delay_lock);
4166 INIT_LIST_HEAD(&mdsc->snap_flush_list);
4167 spin_lock_init(&mdsc->snap_flush_lock);
4168 mdsc->last_cap_flush_tid = 1;
4169 INIT_LIST_HEAD(&mdsc->cap_flush_list);
4170 INIT_LIST_HEAD(&mdsc->cap_dirty);
4171 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
4172 mdsc->num_cap_flushing = 0;
4173 spin_lock_init(&mdsc->cap_dirty_lock);
4174 init_waitqueue_head(&mdsc->cap_flushing_wq);
4175 INIT_WORK(&mdsc->cap_reclaim_work, ceph_cap_reclaim_work);
4176 atomic_set(&mdsc->cap_reclaim_pending, 0);
4178 spin_lock_init(&mdsc->dentry_list_lock);
4179 INIT_LIST_HEAD(&mdsc->dentry_leases);
4180 INIT_LIST_HEAD(&mdsc->dentry_dir_leases);
4182 ceph_caps_init(mdsc);
4183 ceph_adjust_caps_max_min(mdsc, fsc->mount_options);
4185 spin_lock_init(&mdsc->snapid_map_lock);
4186 mdsc->snapid_map_tree = RB_ROOT;
4187 INIT_LIST_HEAD(&mdsc->snapid_map_lru);
4189 init_rwsem(&mdsc->pool_perm_rwsem);
4190 mdsc->pool_perm_tree = RB_ROOT;
4192 strscpy(mdsc->nodename, utsname()->nodename,
4193 sizeof(mdsc->nodename));
4198 * Wait for safe replies on open mds requests. If we time out, drop
4199 * all requests from the tree to avoid dangling dentry refs.
4201 static void wait_requests(struct ceph_mds_client *mdsc)
4203 struct ceph_options *opts = mdsc->fsc->client->options;
4204 struct ceph_mds_request *req;
4206 mutex_lock(&mdsc->mutex);
4207 if (__get_oldest_req(mdsc)) {
4208 mutex_unlock(&mdsc->mutex);
4210 dout("wait_requests waiting for requests\n");
4211 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
4212 ceph_timeout_jiffies(opts->mount_timeout));
4214 /* tear down remaining requests */
4215 mutex_lock(&mdsc->mutex);
4216 while ((req = __get_oldest_req(mdsc))) {
4217 dout("wait_requests timed out on tid %llu\n",
4219 list_del_init(&req->r_wait);
4220 __unregister_request(mdsc, req);
4223 mutex_unlock(&mdsc->mutex);
4224 dout("wait_requests done\n");
4228 * called before mount is ro, and before dentries are torn down.
4229 * (hmm, does this still race with new lookups?)
4231 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
4233 dout("pre_umount\n");
4236 lock_unlock_sessions(mdsc);
4237 ceph_flush_dirty_caps(mdsc);
4238 wait_requests(mdsc);
4241 * wait for reply handlers to drop their request refs and
4242 * their inode/dcache refs
4246 ceph_cleanup_quotarealms_inodes(mdsc);
4250 * wait for all write mds requests to flush.
4252 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
4254 struct ceph_mds_request *req = NULL, *nextreq;
4257 mutex_lock(&mdsc->mutex);
4258 dout("wait_unsafe_requests want %lld\n", want_tid);
4260 req = __get_oldest_req(mdsc);
4261 while (req && req->r_tid <= want_tid) {
4262 /* find next request */
4263 n = rb_next(&req->r_node);
4265 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
4268 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
4269 (req->r_op & CEPH_MDS_OP_WRITE)) {
4271 ceph_mdsc_get_request(req);
4273 ceph_mdsc_get_request(nextreq);
4274 mutex_unlock(&mdsc->mutex);
4275 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
4276 req->r_tid, want_tid);
4277 wait_for_completion(&req->r_safe_completion);
4278 mutex_lock(&mdsc->mutex);
4279 ceph_mdsc_put_request(req);
4281 break; /* next dne before, so we're done! */
4282 if (RB_EMPTY_NODE(&nextreq->r_node)) {
4283 /* next request was removed from tree */
4284 ceph_mdsc_put_request(nextreq);
4287 ceph_mdsc_put_request(nextreq); /* won't go away */
4291 mutex_unlock(&mdsc->mutex);
4292 dout("wait_unsafe_requests done\n");
4295 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
4297 u64 want_tid, want_flush;
4299 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4303 mutex_lock(&mdsc->mutex);
4304 want_tid = mdsc->last_tid;
4305 mutex_unlock(&mdsc->mutex);
4307 ceph_flush_dirty_caps(mdsc);
4308 spin_lock(&mdsc->cap_dirty_lock);
4309 want_flush = mdsc->last_cap_flush_tid;
4310 if (!list_empty(&mdsc->cap_flush_list)) {
4311 struct ceph_cap_flush *cf =
4312 list_last_entry(&mdsc->cap_flush_list,
4313 struct ceph_cap_flush, g_list);
4316 spin_unlock(&mdsc->cap_dirty_lock);
4318 dout("sync want tid %lld flush_seq %lld\n",
4319 want_tid, want_flush);
4321 wait_unsafe_requests(mdsc, want_tid);
4322 wait_caps_flush(mdsc, want_flush);
4326 * true if all sessions are closed, or we force unmount
4328 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
4330 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
4332 return atomic_read(&mdsc->num_sessions) <= skipped;
4336 * called after sb is ro.
4338 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
4340 struct ceph_options *opts = mdsc->fsc->client->options;
4341 struct ceph_mds_session *session;
4345 dout("close_sessions\n");
4347 /* close sessions */
4348 mutex_lock(&mdsc->mutex);
4349 for (i = 0; i < mdsc->max_sessions; i++) {
4350 session = __ceph_lookup_mds_session(mdsc, i);
4353 mutex_unlock(&mdsc->mutex);
4354 mutex_lock(&session->s_mutex);
4355 if (__close_session(mdsc, session) <= 0)
4357 mutex_unlock(&session->s_mutex);
4358 ceph_put_mds_session(session);
4359 mutex_lock(&mdsc->mutex);
4361 mutex_unlock(&mdsc->mutex);
4363 dout("waiting for sessions to close\n");
4364 wait_event_timeout(mdsc->session_close_wq,
4365 done_closing_sessions(mdsc, skipped),
4366 ceph_timeout_jiffies(opts->mount_timeout));
4368 /* tear down remaining sessions */
4369 mutex_lock(&mdsc->mutex);
4370 for (i = 0; i < mdsc->max_sessions; i++) {
4371 if (mdsc->sessions[i]) {
4372 session = get_session(mdsc->sessions[i]);
4373 __unregister_session(mdsc, session);
4374 mutex_unlock(&mdsc->mutex);
4375 mutex_lock(&session->s_mutex);
4376 remove_session_caps(session);
4377 mutex_unlock(&session->s_mutex);
4378 ceph_put_mds_session(session);
4379 mutex_lock(&mdsc->mutex);
4382 WARN_ON(!list_empty(&mdsc->cap_delay_list));
4383 mutex_unlock(&mdsc->mutex);
4385 ceph_cleanup_snapid_map(mdsc);
4386 ceph_cleanup_empty_realms(mdsc);
4388 cancel_work_sync(&mdsc->cap_reclaim_work);
4389 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4394 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
4396 struct ceph_mds_session *session;
4399 dout("force umount\n");
4401 mutex_lock(&mdsc->mutex);
4402 for (mds = 0; mds < mdsc->max_sessions; mds++) {
4403 session = __ceph_lookup_mds_session(mdsc, mds);
4407 if (session->s_state == CEPH_MDS_SESSION_REJECTED)
4408 __unregister_session(mdsc, session);
4409 __wake_requests(mdsc, &session->s_waiting);
4410 mutex_unlock(&mdsc->mutex);
4412 mutex_lock(&session->s_mutex);
4413 __close_session(mdsc, session);
4414 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
4415 cleanup_session_requests(mdsc, session);
4416 remove_session_caps(session);
4418 mutex_unlock(&session->s_mutex);
4419 ceph_put_mds_session(session);
4421 mutex_lock(&mdsc->mutex);
4422 kick_requests(mdsc, mds);
4424 __wake_requests(mdsc, &mdsc->waiting_for_map);
4425 mutex_unlock(&mdsc->mutex);
4428 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
4431 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
4433 ceph_mdsmap_destroy(mdsc->mdsmap);
4434 kfree(mdsc->sessions);
4435 ceph_caps_finalize(mdsc);
4436 ceph_pool_perm_destroy(mdsc);
4439 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
4441 struct ceph_mds_client *mdsc = fsc->mdsc;
4442 dout("mdsc_destroy %p\n", mdsc);
4447 /* flush out any connection work with references to us */
4450 ceph_mdsc_stop(mdsc);
4454 dout("mdsc_destroy %p done\n", mdsc);
4457 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4459 struct ceph_fs_client *fsc = mdsc->fsc;
4460 const char *mds_namespace = fsc->mount_options->mds_namespace;
4461 void *p = msg->front.iov_base;
4462 void *end = p + msg->front.iov_len;
4466 u32 mount_fscid = (u32)-1;
4467 u8 struct_v, struct_cv;
4470 ceph_decode_need(&p, end, sizeof(u32), bad);
4471 epoch = ceph_decode_32(&p);
4473 dout("handle_fsmap epoch %u\n", epoch);
4475 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4476 struct_v = ceph_decode_8(&p);
4477 struct_cv = ceph_decode_8(&p);
4478 map_len = ceph_decode_32(&p);
4480 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
4481 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
4483 num_fs = ceph_decode_32(&p);
4484 while (num_fs-- > 0) {
4485 void *info_p, *info_end;
4490 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
4491 info_v = ceph_decode_8(&p);
4492 info_cv = ceph_decode_8(&p);
4493 info_len = ceph_decode_32(&p);
4494 ceph_decode_need(&p, end, info_len, bad);
4496 info_end = p + info_len;
4499 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
4500 fscid = ceph_decode_32(&info_p);
4501 namelen = ceph_decode_32(&info_p);
4502 ceph_decode_need(&info_p, info_end, namelen, bad);
4504 if (mds_namespace &&
4505 strlen(mds_namespace) == namelen &&
4506 !strncmp(mds_namespace, (char *)info_p, namelen)) {
4507 mount_fscid = fscid;
4512 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
4513 if (mount_fscid != (u32)-1) {
4514 fsc->client->monc.fs_cluster_id = mount_fscid;
4515 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
4517 ceph_monc_renew_subs(&fsc->client->monc);
4525 pr_err("error decoding fsmap\n");
4527 mutex_lock(&mdsc->mutex);
4528 mdsc->mdsmap_err = err;
4529 __wake_requests(mdsc, &mdsc->waiting_for_map);
4530 mutex_unlock(&mdsc->mutex);
4534 * handle mds map update.
4536 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
4540 void *p = msg->front.iov_base;
4541 void *end = p + msg->front.iov_len;
4542 struct ceph_mdsmap *newmap, *oldmap;
4543 struct ceph_fsid fsid;
4546 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
4547 ceph_decode_copy(&p, &fsid, sizeof(fsid));
4548 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
4550 epoch = ceph_decode_32(&p);
4551 maplen = ceph_decode_32(&p);
4552 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
4554 /* do we need it? */
4555 mutex_lock(&mdsc->mutex);
4556 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
4557 dout("handle_map epoch %u <= our %u\n",
4558 epoch, mdsc->mdsmap->m_epoch);
4559 mutex_unlock(&mdsc->mutex);
4563 newmap = ceph_mdsmap_decode(&p, end);
4564 if (IS_ERR(newmap)) {
4565 err = PTR_ERR(newmap);
4569 /* swap into place */
4571 oldmap = mdsc->mdsmap;
4572 mdsc->mdsmap = newmap;
4573 check_new_map(mdsc, newmap, oldmap);
4574 ceph_mdsmap_destroy(oldmap);
4576 mdsc->mdsmap = newmap; /* first mds map */
4578 mdsc->fsc->max_file_size = min((loff_t)mdsc->mdsmap->m_max_file_size,
4581 __wake_requests(mdsc, &mdsc->waiting_for_map);
4582 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
4583 mdsc->mdsmap->m_epoch);
4585 mutex_unlock(&mdsc->mutex);
4586 schedule_delayed(mdsc);
4590 mutex_unlock(&mdsc->mutex);
4592 pr_err("error decoding mdsmap %d\n", err);
4596 static struct ceph_connection *con_get(struct ceph_connection *con)
4598 struct ceph_mds_session *s = con->private;
4600 if (get_session(s)) {
4601 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
4604 dout("mdsc con_get %p FAIL\n", s);
4608 static void con_put(struct ceph_connection *con)
4610 struct ceph_mds_session *s = con->private;
4612 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
4613 ceph_put_mds_session(s);
4617 * if the client is unresponsive for long enough, the mds will kill
4618 * the session entirely.
4620 static void peer_reset(struct ceph_connection *con)
4622 struct ceph_mds_session *s = con->private;
4623 struct ceph_mds_client *mdsc = s->s_mdsc;
4625 pr_warn("mds%d closed our session\n", s->s_mds);
4626 send_mds_reconnect(mdsc, s);
4629 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
4631 struct ceph_mds_session *s = con->private;
4632 struct ceph_mds_client *mdsc = s->s_mdsc;
4633 int type = le16_to_cpu(msg->hdr.type);
4635 mutex_lock(&mdsc->mutex);
4636 if (__verify_registered_session(mdsc, s) < 0) {
4637 mutex_unlock(&mdsc->mutex);
4640 mutex_unlock(&mdsc->mutex);
4643 case CEPH_MSG_MDS_MAP:
4644 ceph_mdsc_handle_mdsmap(mdsc, msg);
4646 case CEPH_MSG_FS_MAP_USER:
4647 ceph_mdsc_handle_fsmap(mdsc, msg);
4649 case CEPH_MSG_CLIENT_SESSION:
4650 handle_session(s, msg);
4652 case CEPH_MSG_CLIENT_REPLY:
4653 handle_reply(s, msg);
4655 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
4656 handle_forward(mdsc, s, msg);
4658 case CEPH_MSG_CLIENT_CAPS:
4659 ceph_handle_caps(s, msg);
4661 case CEPH_MSG_CLIENT_SNAP:
4662 ceph_handle_snap(mdsc, s, msg);
4664 case CEPH_MSG_CLIENT_LEASE:
4665 handle_lease(mdsc, s, msg);
4667 case CEPH_MSG_CLIENT_QUOTA:
4668 ceph_handle_quota(mdsc, s, msg);
4672 pr_err("received unknown message type %d %s\n", type,
4673 ceph_msg_type_name(type));
4684 * Note: returned pointer is the address of a structure that's
4685 * managed separately. Caller must *not* attempt to free it.
4687 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4688 int *proto, int force_new)
4690 struct ceph_mds_session *s = con->private;
4691 struct ceph_mds_client *mdsc = s->s_mdsc;
4692 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4693 struct ceph_auth_handshake *auth = &s->s_auth;
4695 if (force_new && auth->authorizer) {
4696 ceph_auth_destroy_authorizer(auth->authorizer);
4697 auth->authorizer = NULL;
4699 if (!auth->authorizer) {
4700 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4703 return ERR_PTR(ret);
4705 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4708 return ERR_PTR(ret);
4710 *proto = ac->protocol;
4715 static int add_authorizer_challenge(struct ceph_connection *con,
4716 void *challenge_buf, int challenge_buf_len)
4718 struct ceph_mds_session *s = con->private;
4719 struct ceph_mds_client *mdsc = s->s_mdsc;
4720 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4722 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4723 challenge_buf, challenge_buf_len);
4726 static int verify_authorizer_reply(struct ceph_connection *con)
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_verify_authorizer_reply(ac, s->s_auth.authorizer);
4735 static int invalidate_authorizer(struct ceph_connection *con)
4737 struct ceph_mds_session *s = con->private;
4738 struct ceph_mds_client *mdsc = s->s_mdsc;
4739 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4741 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4743 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4746 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4747 struct ceph_msg_header *hdr, int *skip)
4749 struct ceph_msg *msg;
4750 int type = (int) le16_to_cpu(hdr->type);
4751 int front_len = (int) le32_to_cpu(hdr->front_len);
4757 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4759 pr_err("unable to allocate msg type %d len %d\n",
4767 static int mds_sign_message(struct ceph_msg *msg)
4769 struct ceph_mds_session *s = msg->con->private;
4770 struct ceph_auth_handshake *auth = &s->s_auth;
4772 return ceph_auth_sign_message(auth, msg);
4775 static int mds_check_message_signature(struct ceph_msg *msg)
4777 struct ceph_mds_session *s = msg->con->private;
4778 struct ceph_auth_handshake *auth = &s->s_auth;
4780 return ceph_auth_check_message_signature(auth, msg);
4783 static const struct ceph_connection_operations mds_con_ops = {
4786 .dispatch = dispatch,
4787 .get_authorizer = get_authorizer,
4788 .add_authorizer_challenge = add_authorizer_challenge,
4789 .verify_authorizer_reply = verify_authorizer_reply,
4790 .invalidate_authorizer = invalidate_authorizer,
4791 .peer_reset = peer_reset,
4792 .alloc_msg = mds_alloc_msg,
4793 .sign_message = mds_sign_message,
4794 .check_message_signature = mds_check_message_signature,