1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
7 #include <linux/sched.h>
8 #include <linux/debugfs.h>
9 #include <linux/seq_file.h>
10 #include <linux/utsname.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>
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
48 struct ceph_reconnect_state {
50 struct ceph_pagelist *pagelist;
54 static void __wake_requests(struct ceph_mds_client *mdsc,
55 struct list_head *head);
57 static const struct ceph_connection_operations mds_con_ops;
65 * parse individual inode info
67 static int parse_reply_info_in(void **p, void *end,
68 struct ceph_mds_reply_info_in *info,
74 *p += sizeof(struct ceph_mds_reply_inode) +
75 sizeof(*info->in->fragtree.splits) *
76 le32_to_cpu(info->in->fragtree.nsplits);
78 ceph_decode_32_safe(p, end, info->symlink_len, bad);
79 ceph_decode_need(p, end, info->symlink_len, bad);
81 *p += info->symlink_len;
83 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
84 ceph_decode_copy_safe(p, end, &info->dir_layout,
85 sizeof(info->dir_layout), bad);
87 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
89 ceph_decode_32_safe(p, end, info->xattr_len, bad);
90 ceph_decode_need(p, end, info->xattr_len, bad);
91 info->xattr_data = *p;
92 *p += info->xattr_len;
94 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
95 ceph_decode_64_safe(p, end, info->inline_version, bad);
96 ceph_decode_32_safe(p, end, info->inline_len, bad);
97 ceph_decode_need(p, end, info->inline_len, bad);
98 info->inline_data = *p;
99 *p += info->inline_len;
101 info->inline_version = CEPH_INLINE_NONE;
103 info->pool_ns_len = 0;
104 info->pool_ns_data = NULL;
105 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
106 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
107 if (info->pool_ns_len > 0) {
108 ceph_decode_need(p, end, info->pool_ns_len, bad);
109 info->pool_ns_data = *p;
110 *p += info->pool_ns_len;
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
123 static int parse_reply_info_trace(void **p, void *end,
124 struct ceph_mds_reply_info_parsed *info,
129 if (info->head->is_dentry) {
130 err = parse_reply_info_in(p, end, &info->diri, features);
134 if (unlikely(*p + sizeof(*info->dirfrag) > end))
137 *p += sizeof(*info->dirfrag) +
138 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
139 if (unlikely(*p > end))
142 ceph_decode_32_safe(p, end, info->dname_len, bad);
143 ceph_decode_need(p, end, info->dname_len, bad);
145 *p += info->dname_len;
147 *p += sizeof(*info->dlease);
150 if (info->head->is_target) {
151 err = parse_reply_info_in(p, end, &info->targeti, features);
156 if (unlikely(*p != end))
163 pr_err("problem parsing mds trace %d\n", err);
168 * parse readdir results
170 static int parse_reply_info_dir(void **p, void *end,
171 struct ceph_mds_reply_info_parsed *info,
178 if (*p + sizeof(*info->dir_dir) > end)
180 *p += sizeof(*info->dir_dir) +
181 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
185 ceph_decode_need(p, end, sizeof(num) + 2, bad);
186 num = ceph_decode_32(p);
188 u16 flags = ceph_decode_16(p);
189 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
190 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
191 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
196 BUG_ON(!info->dir_entries);
197 if ((unsigned long)(info->dir_entries + num) >
198 (unsigned long)info->dir_entries + info->dir_buf_size) {
199 pr_err("dir contents are larger than expected\n");
206 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
208 ceph_decode_need(p, end, sizeof(u32)*2, bad);
209 rde->name_len = ceph_decode_32(p);
210 ceph_decode_need(p, end, rde->name_len, bad);
213 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
215 *p += sizeof(struct ceph_mds_reply_lease);
218 err = parse_reply_info_in(p, end, &rde->inode, features);
221 /* ceph_readdir_prepopulate() will update it */
235 pr_err("problem parsing dir contents %d\n", err);
240 * parse fcntl F_GETLK results
242 static int parse_reply_info_filelock(void **p, void *end,
243 struct ceph_mds_reply_info_parsed *info,
246 if (*p + sizeof(*info->filelock_reply) > end)
249 info->filelock_reply = *p;
250 *p += sizeof(*info->filelock_reply);
252 if (unlikely(*p != end))
261 * parse create results
263 static int parse_reply_info_create(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
267 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
269 info->has_create_ino = false;
271 info->has_create_ino = true;
272 info->ino = ceph_decode_64(p);
276 if (unlikely(*p != end))
285 * parse extra results
287 static int parse_reply_info_extra(void **p, void *end,
288 struct ceph_mds_reply_info_parsed *info,
291 u32 op = le32_to_cpu(info->head->op);
293 if (op == CEPH_MDS_OP_GETFILELOCK)
294 return parse_reply_info_filelock(p, end, info, features);
295 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
296 return parse_reply_info_dir(p, end, info, features);
297 else if (op == CEPH_MDS_OP_CREATE)
298 return parse_reply_info_create(p, end, info, features);
304 * parse entire mds reply
306 static int parse_reply_info(struct ceph_msg *msg,
307 struct ceph_mds_reply_info_parsed *info,
314 info->head = msg->front.iov_base;
315 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
316 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
319 ceph_decode_32_safe(&p, end, len, bad);
321 ceph_decode_need(&p, end, len, bad);
322 err = parse_reply_info_trace(&p, p+len, info, features);
328 ceph_decode_32_safe(&p, end, len, bad);
330 ceph_decode_need(&p, end, len, bad);
331 err = parse_reply_info_extra(&p, p+len, info, features);
337 ceph_decode_32_safe(&p, end, len, bad);
338 info->snapblob_len = len;
349 pr_err("mds parse_reply err %d\n", err);
353 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
355 if (!info->dir_entries)
357 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
364 const char *ceph_session_state_name(int s)
367 case CEPH_MDS_SESSION_NEW: return "new";
368 case CEPH_MDS_SESSION_OPENING: return "opening";
369 case CEPH_MDS_SESSION_OPEN: return "open";
370 case CEPH_MDS_SESSION_HUNG: return "hung";
371 case CEPH_MDS_SESSION_CLOSING: return "closing";
372 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
373 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
374 case CEPH_MDS_SESSION_REJECTED: return "rejected";
375 default: return "???";
379 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
381 if (atomic_inc_not_zero(&s->s_ref)) {
382 dout("mdsc get_session %p %d -> %d\n", s,
383 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
386 dout("mdsc get_session %p 0 -- FAIL", s);
391 void ceph_put_mds_session(struct ceph_mds_session *s)
393 dout("mdsc put_session %p %d -> %d\n", s,
394 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
395 if (atomic_dec_and_test(&s->s_ref)) {
396 if (s->s_auth.authorizer)
397 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
403 * called under mdsc->mutex
405 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
408 struct ceph_mds_session *session;
410 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
412 session = mdsc->sessions[mds];
413 dout("lookup_mds_session %p %d\n", session,
414 atomic_read(&session->s_ref));
415 get_session(session);
419 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
421 if (mds >= mdsc->max_sessions)
423 return mdsc->sessions[mds];
426 static int __verify_registered_session(struct ceph_mds_client *mdsc,
427 struct ceph_mds_session *s)
429 if (s->s_mds >= mdsc->max_sessions ||
430 mdsc->sessions[s->s_mds] != s)
436 * create+register a new session for given mds.
437 * called under mdsc->mutex.
439 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
442 struct ceph_mds_session *s;
444 if (mds >= mdsc->mdsmap->m_max_mds)
445 return ERR_PTR(-EINVAL);
447 s = kzalloc(sizeof(*s), GFP_NOFS);
449 return ERR_PTR(-ENOMEM);
452 s->s_state = CEPH_MDS_SESSION_NEW;
455 mutex_init(&s->s_mutex);
457 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
459 spin_lock_init(&s->s_gen_ttl_lock);
461 s->s_cap_ttl = jiffies - 1;
463 spin_lock_init(&s->s_cap_lock);
464 s->s_renew_requested = 0;
466 INIT_LIST_HEAD(&s->s_caps);
469 atomic_set(&s->s_ref, 1);
470 INIT_LIST_HEAD(&s->s_waiting);
471 INIT_LIST_HEAD(&s->s_unsafe);
472 s->s_num_cap_releases = 0;
473 s->s_cap_reconnect = 0;
474 s->s_cap_iterator = NULL;
475 INIT_LIST_HEAD(&s->s_cap_releases);
476 INIT_LIST_HEAD(&s->s_cap_flushing);
478 dout("register_session mds%d\n", mds);
479 if (mds >= mdsc->max_sessions) {
480 int newmax = 1 << get_count_order(mds+1);
481 struct ceph_mds_session **sa;
483 dout("register_session realloc to %d\n", newmax);
484 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
487 if (mdsc->sessions) {
488 memcpy(sa, mdsc->sessions,
489 mdsc->max_sessions * sizeof(void *));
490 kfree(mdsc->sessions);
493 mdsc->max_sessions = newmax;
495 mdsc->sessions[mds] = s;
496 atomic_inc(&mdsc->num_sessions);
497 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
499 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
500 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
506 return ERR_PTR(-ENOMEM);
510 * called under mdsc->mutex
512 static void __unregister_session(struct ceph_mds_client *mdsc,
513 struct ceph_mds_session *s)
515 dout("__unregister_session mds%d %p\n", s->s_mds, s);
516 BUG_ON(mdsc->sessions[s->s_mds] != s);
517 mdsc->sessions[s->s_mds] = NULL;
518 ceph_con_close(&s->s_con);
519 ceph_put_mds_session(s);
520 atomic_dec(&mdsc->num_sessions);
524 * drop session refs in request.
526 * should be last request ref, or hold mdsc->mutex
528 static void put_request_session(struct ceph_mds_request *req)
530 if (req->r_session) {
531 ceph_put_mds_session(req->r_session);
532 req->r_session = NULL;
536 void ceph_mdsc_release_request(struct kref *kref)
538 struct ceph_mds_request *req = container_of(kref,
539 struct ceph_mds_request,
541 destroy_reply_info(&req->r_reply_info);
543 ceph_msg_put(req->r_request);
545 ceph_msg_put(req->r_reply);
547 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
550 if (req->r_locked_dir)
551 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
552 iput(req->r_target_inode);
555 if (req->r_old_dentry)
556 dput(req->r_old_dentry);
557 if (req->r_old_dentry_dir) {
559 * track (and drop pins for) r_old_dentry_dir
560 * separately, since r_old_dentry's d_parent may have
561 * changed between the dir mutex being dropped and
562 * this request being freed.
564 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
566 iput(req->r_old_dentry_dir);
571 ceph_pagelist_release(req->r_pagelist);
572 put_request_session(req);
573 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
577 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
580 * lookup session, bump ref if found.
582 * called under mdsc->mutex.
584 static struct ceph_mds_request *
585 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
587 struct ceph_mds_request *req;
589 req = lookup_request(&mdsc->request_tree, tid);
591 ceph_mdsc_get_request(req);
597 * Register an in-flight request, and assign a tid. Link to directory
598 * are modifying (if any).
600 * Called under mdsc->mutex.
602 static void __register_request(struct ceph_mds_client *mdsc,
603 struct ceph_mds_request *req,
606 req->r_tid = ++mdsc->last_tid;
608 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 dout("__register_request %p tid %lld\n", req, req->r_tid);
611 ceph_mdsc_get_request(req);
612 insert_request(&mdsc->request_tree, req);
614 req->r_uid = current_fsuid();
615 req->r_gid = current_fsgid();
617 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
618 mdsc->oldest_tid = req->r_tid;
622 req->r_unsafe_dir = dir;
626 static void __unregister_request(struct ceph_mds_client *mdsc,
627 struct ceph_mds_request *req)
629 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
631 if (req->r_tid == mdsc->oldest_tid) {
632 struct rb_node *p = rb_next(&req->r_node);
633 mdsc->oldest_tid = 0;
635 struct ceph_mds_request *next_req =
636 rb_entry(p, struct ceph_mds_request, r_node);
637 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
638 mdsc->oldest_tid = next_req->r_tid;
645 erase_request(&mdsc->request_tree, req);
647 if (req->r_unsafe_dir && req->r_got_unsafe) {
648 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
649 spin_lock(&ci->i_unsafe_lock);
650 list_del_init(&req->r_unsafe_dir_item);
651 spin_unlock(&ci->i_unsafe_lock);
653 if (req->r_target_inode && req->r_got_unsafe) {
654 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
655 spin_lock(&ci->i_unsafe_lock);
656 list_del_init(&req->r_unsafe_target_item);
657 spin_unlock(&ci->i_unsafe_lock);
660 if (req->r_unsafe_dir) {
661 iput(req->r_unsafe_dir);
662 req->r_unsafe_dir = NULL;
665 complete_all(&req->r_safe_completion);
667 ceph_mdsc_put_request(req);
671 * Choose mds to send request to next. If there is a hint set in the
672 * request (e.g., due to a prior forward hint from the mds), use that.
673 * Otherwise, consult frag tree and/or caps to identify the
674 * appropriate mds. If all else fails, choose randomly.
676 * Called under mdsc->mutex.
678 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
681 * we don't need to worry about protecting the d_parent access
682 * here because we never renaming inside the snapped namespace
683 * except to resplice to another snapdir, and either the old or new
684 * result is a valid result.
686 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
687 dentry = dentry->d_parent;
691 static int __choose_mds(struct ceph_mds_client *mdsc,
692 struct ceph_mds_request *req)
695 struct ceph_inode_info *ci;
696 struct ceph_cap *cap;
697 int mode = req->r_direct_mode;
699 u32 hash = req->r_direct_hash;
700 bool is_hash = req->r_direct_is_hash;
703 * is there a specific mds we should try? ignore hint if we have
704 * no session and the mds is not up (active or recovering).
706 if (req->r_resend_mds >= 0 &&
707 (__have_session(mdsc, req->r_resend_mds) ||
708 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
709 dout("choose_mds using resend_mds mds%d\n",
711 return req->r_resend_mds;
714 if (mode == USE_RANDOM_MDS)
719 inode = req->r_inode;
720 } else if (req->r_dentry) {
721 /* ignore race with rename; old or new d_parent is okay */
722 struct dentry *parent = req->r_dentry->d_parent;
723 struct inode *dir = d_inode(parent);
725 if (dir->i_sb != mdsc->fsc->sb) {
727 inode = d_inode(req->r_dentry);
728 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
729 /* direct snapped/virtual snapdir requests
730 * based on parent dir inode */
731 struct dentry *dn = get_nonsnap_parent(parent);
733 dout("__choose_mds using nonsnap parent %p\n", inode);
736 inode = d_inode(req->r_dentry);
737 if (!inode || mode == USE_AUTH_MDS) {
740 hash = ceph_dentry_hash(dir, req->r_dentry);
746 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
750 ci = ceph_inode(inode);
752 if (is_hash && S_ISDIR(inode->i_mode)) {
753 struct ceph_inode_frag frag;
756 ceph_choose_frag(ci, hash, &frag, &found);
758 if (mode == USE_ANY_MDS && frag.ndist > 0) {
761 /* choose a random replica */
762 get_random_bytes(&r, 1);
765 dout("choose_mds %p %llx.%llx "
766 "frag %u mds%d (%d/%d)\n",
767 inode, ceph_vinop(inode),
770 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
771 CEPH_MDS_STATE_ACTIVE)
775 /* since this file/dir wasn't known to be
776 * replicated, then we want to look for the
777 * authoritative mds. */
780 /* choose auth mds */
782 dout("choose_mds %p %llx.%llx "
783 "frag %u mds%d (auth)\n",
784 inode, ceph_vinop(inode), frag.frag, mds);
785 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
786 CEPH_MDS_STATE_ACTIVE)
792 spin_lock(&ci->i_ceph_lock);
794 if (mode == USE_AUTH_MDS)
795 cap = ci->i_auth_cap;
796 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
797 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
799 spin_unlock(&ci->i_ceph_lock);
802 mds = cap->session->s_mds;
803 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
804 inode, ceph_vinop(inode), mds,
805 cap == ci->i_auth_cap ? "auth " : "", cap);
806 spin_unlock(&ci->i_ceph_lock);
810 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
811 dout("choose_mds chose random mds%d\n", mds);
819 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
821 struct ceph_msg *msg;
822 struct ceph_mds_session_head *h;
824 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
827 pr_err("create_session_msg ENOMEM creating msg\n");
830 h = msg->front.iov_base;
831 h->op = cpu_to_le32(op);
832 h->seq = cpu_to_le64(seq);
838 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
839 * to include additional client metadata fields.
841 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
843 struct ceph_msg *msg;
844 struct ceph_mds_session_head *h;
846 int metadata_bytes = 0;
847 int metadata_key_count = 0;
848 struct ceph_options *opt = mdsc->fsc->client->options;
849 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
852 const char* metadata[][2] = {
853 {"hostname", utsname()->nodename},
854 {"kernel_version", utsname()->release},
855 {"entity_id", opt->name ? : ""},
856 {"root", fsopt->server_path ? : "/"},
860 /* Calculate serialized length of metadata */
861 metadata_bytes = 4; /* map length */
862 for (i = 0; metadata[i][0] != NULL; ++i) {
863 metadata_bytes += 8 + strlen(metadata[i][0]) +
864 strlen(metadata[i][1]);
865 metadata_key_count++;
868 /* Allocate the message */
869 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
872 pr_err("create_session_msg ENOMEM creating msg\n");
875 h = msg->front.iov_base;
876 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
877 h->seq = cpu_to_le64(seq);
880 * Serialize client metadata into waiting buffer space, using
881 * the format that userspace expects for map<string, string>
883 * ClientSession messages with metadata are v2
885 msg->hdr.version = cpu_to_le16(2);
886 msg->hdr.compat_version = cpu_to_le16(1);
888 /* The write pointer, following the session_head structure */
889 p = msg->front.iov_base + sizeof(*h);
891 /* Number of entries in the map */
892 ceph_encode_32(&p, metadata_key_count);
894 /* Two length-prefixed strings for each entry in the map */
895 for (i = 0; metadata[i][0] != NULL; ++i) {
896 size_t const key_len = strlen(metadata[i][0]);
897 size_t const val_len = strlen(metadata[i][1]);
899 ceph_encode_32(&p, key_len);
900 memcpy(p, metadata[i][0], key_len);
902 ceph_encode_32(&p, val_len);
903 memcpy(p, metadata[i][1], val_len);
911 * send session open request.
913 * called under mdsc->mutex
915 static int __open_session(struct ceph_mds_client *mdsc,
916 struct ceph_mds_session *session)
918 struct ceph_msg *msg;
920 int mds = session->s_mds;
922 /* wait for mds to go active? */
923 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
924 dout("open_session to mds%d (%s)\n", mds,
925 ceph_mds_state_name(mstate));
926 session->s_state = CEPH_MDS_SESSION_OPENING;
927 session->s_renew_requested = jiffies;
929 /* send connect message */
930 msg = create_session_open_msg(mdsc, session->s_seq);
933 ceph_con_send(&session->s_con, msg);
938 * open sessions for any export targets for the given mds
940 * called under mdsc->mutex
942 static struct ceph_mds_session *
943 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
945 struct ceph_mds_session *session;
947 session = __ceph_lookup_mds_session(mdsc, target);
949 session = register_session(mdsc, target);
953 if (session->s_state == CEPH_MDS_SESSION_NEW ||
954 session->s_state == CEPH_MDS_SESSION_CLOSING)
955 __open_session(mdsc, session);
960 struct ceph_mds_session *
961 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
963 struct ceph_mds_session *session;
965 dout("open_export_target_session to mds%d\n", target);
967 mutex_lock(&mdsc->mutex);
968 session = __open_export_target_session(mdsc, target);
969 mutex_unlock(&mdsc->mutex);
974 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
975 struct ceph_mds_session *session)
977 struct ceph_mds_info *mi;
978 struct ceph_mds_session *ts;
979 int i, mds = session->s_mds;
981 if (mds >= mdsc->mdsmap->m_max_mds)
984 mi = &mdsc->mdsmap->m_info[mds];
985 dout("open_export_target_sessions for mds%d (%d targets)\n",
986 session->s_mds, mi->num_export_targets);
988 for (i = 0; i < mi->num_export_targets; i++) {
989 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
991 ceph_put_mds_session(ts);
995 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
996 struct ceph_mds_session *session)
998 mutex_lock(&mdsc->mutex);
999 __open_export_target_sessions(mdsc, session);
1000 mutex_unlock(&mdsc->mutex);
1007 /* caller holds s_cap_lock, we drop it */
1008 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1009 struct ceph_mds_session *session)
1010 __releases(session->s_cap_lock)
1012 LIST_HEAD(tmp_list);
1013 list_splice_init(&session->s_cap_releases, &tmp_list);
1014 session->s_num_cap_releases = 0;
1015 spin_unlock(&session->s_cap_lock);
1017 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1018 while (!list_empty(&tmp_list)) {
1019 struct ceph_cap *cap;
1020 /* zero out the in-progress message */
1021 cap = list_first_entry(&tmp_list,
1022 struct ceph_cap, session_caps);
1023 list_del(&cap->session_caps);
1024 ceph_put_cap(mdsc, cap);
1028 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1029 struct ceph_mds_session *session)
1031 struct ceph_mds_request *req;
1034 dout("cleanup_session_requests mds%d\n", session->s_mds);
1035 mutex_lock(&mdsc->mutex);
1036 while (!list_empty(&session->s_unsafe)) {
1037 req = list_first_entry(&session->s_unsafe,
1038 struct ceph_mds_request, r_unsafe_item);
1039 list_del_init(&req->r_unsafe_item);
1040 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1042 __unregister_request(mdsc, req);
1044 /* zero r_attempts, so kick_requests() will re-send requests */
1045 p = rb_first(&mdsc->request_tree);
1047 req = rb_entry(p, struct ceph_mds_request, r_node);
1049 if (req->r_session &&
1050 req->r_session->s_mds == session->s_mds)
1051 req->r_attempts = 0;
1053 mutex_unlock(&mdsc->mutex);
1057 * Helper to safely iterate over all caps associated with a session, with
1058 * special care taken to handle a racing __ceph_remove_cap().
1060 * Caller must hold session s_mutex.
1062 static int iterate_session_caps(struct ceph_mds_session *session,
1063 int (*cb)(struct inode *, struct ceph_cap *,
1066 struct list_head *p;
1067 struct ceph_cap *cap;
1068 struct inode *inode, *last_inode = NULL;
1069 struct ceph_cap *old_cap = NULL;
1072 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1073 spin_lock(&session->s_cap_lock);
1074 p = session->s_caps.next;
1075 while (p != &session->s_caps) {
1076 cap = list_entry(p, struct ceph_cap, session_caps);
1077 inode = igrab(&cap->ci->vfs_inode);
1082 session->s_cap_iterator = cap;
1083 spin_unlock(&session->s_cap_lock);
1090 ceph_put_cap(session->s_mdsc, old_cap);
1094 ret = cb(inode, cap, arg);
1097 spin_lock(&session->s_cap_lock);
1099 if (cap->ci == NULL) {
1100 dout("iterate_session_caps finishing cap %p removal\n",
1102 BUG_ON(cap->session != session);
1103 cap->session = NULL;
1104 list_del_init(&cap->session_caps);
1105 session->s_nr_caps--;
1106 if (cap->queue_release) {
1107 list_add_tail(&cap->session_caps,
1108 &session->s_cap_releases);
1109 session->s_num_cap_releases++;
1111 old_cap = cap; /* put_cap it w/o locks held */
1119 session->s_cap_iterator = NULL;
1120 spin_unlock(&session->s_cap_lock);
1124 ceph_put_cap(session->s_mdsc, old_cap);
1129 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1132 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1133 struct ceph_inode_info *ci = ceph_inode(inode);
1134 LIST_HEAD(to_remove);
1136 bool invalidate = false;
1138 dout("removing cap %p, ci is %p, inode is %p\n",
1139 cap, ci, &ci->vfs_inode);
1140 spin_lock(&ci->i_ceph_lock);
1141 __ceph_remove_cap(cap, false);
1142 if (!ci->i_auth_cap) {
1143 struct ceph_cap_flush *cf;
1144 struct ceph_mds_client *mdsc = fsc->mdsc;
1146 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1148 if (ci->i_wrbuffer_ref > 0 &&
1149 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1152 while (!list_empty(&ci->i_cap_flush_list)) {
1153 cf = list_first_entry(&ci->i_cap_flush_list,
1154 struct ceph_cap_flush, i_list);
1155 list_move(&cf->i_list, &to_remove);
1158 spin_lock(&mdsc->cap_dirty_lock);
1160 list_for_each_entry(cf, &to_remove, i_list)
1161 list_del(&cf->g_list);
1163 if (!list_empty(&ci->i_dirty_item)) {
1164 pr_warn_ratelimited(
1165 " dropping dirty %s state for %p %lld\n",
1166 ceph_cap_string(ci->i_dirty_caps),
1167 inode, ceph_ino(inode));
1168 ci->i_dirty_caps = 0;
1169 list_del_init(&ci->i_dirty_item);
1172 if (!list_empty(&ci->i_flushing_item)) {
1173 pr_warn_ratelimited(
1174 " dropping dirty+flushing %s state for %p %lld\n",
1175 ceph_cap_string(ci->i_flushing_caps),
1176 inode, ceph_ino(inode));
1177 ci->i_flushing_caps = 0;
1178 list_del_init(&ci->i_flushing_item);
1179 mdsc->num_cap_flushing--;
1182 spin_unlock(&mdsc->cap_dirty_lock);
1184 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1185 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1186 ci->i_prealloc_cap_flush = NULL;
1189 spin_unlock(&ci->i_ceph_lock);
1190 while (!list_empty(&to_remove)) {
1191 struct ceph_cap_flush *cf;
1192 cf = list_first_entry(&to_remove,
1193 struct ceph_cap_flush, i_list);
1194 list_del(&cf->i_list);
1195 ceph_free_cap_flush(cf);
1198 wake_up_all(&ci->i_cap_wq);
1200 ceph_queue_invalidate(inode);
1207 * caller must hold session s_mutex
1209 static void remove_session_caps(struct ceph_mds_session *session)
1211 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1212 struct super_block *sb = fsc->sb;
1213 dout("remove_session_caps on %p\n", session);
1214 iterate_session_caps(session, remove_session_caps_cb, fsc);
1216 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1218 spin_lock(&session->s_cap_lock);
1219 if (session->s_nr_caps > 0) {
1220 struct inode *inode;
1221 struct ceph_cap *cap, *prev = NULL;
1222 struct ceph_vino vino;
1224 * iterate_session_caps() skips inodes that are being
1225 * deleted, we need to wait until deletions are complete.
1226 * __wait_on_freeing_inode() is designed for the job,
1227 * but it is not exported, so use lookup inode function
1230 while (!list_empty(&session->s_caps)) {
1231 cap = list_entry(session->s_caps.next,
1232 struct ceph_cap, session_caps);
1236 vino = cap->ci->i_vino;
1237 spin_unlock(&session->s_cap_lock);
1239 inode = ceph_find_inode(sb, vino);
1242 spin_lock(&session->s_cap_lock);
1246 // drop cap expires and unlock s_cap_lock
1247 cleanup_cap_releases(session->s_mdsc, session);
1249 BUG_ON(session->s_nr_caps > 0);
1250 BUG_ON(!list_empty(&session->s_cap_flushing));
1254 * wake up any threads waiting on this session's caps. if the cap is
1255 * old (didn't get renewed on the client reconnect), remove it now.
1257 * caller must hold s_mutex.
1259 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1262 struct ceph_inode_info *ci = ceph_inode(inode);
1265 spin_lock(&ci->i_ceph_lock);
1266 ci->i_wanted_max_size = 0;
1267 ci->i_requested_max_size = 0;
1268 spin_unlock(&ci->i_ceph_lock);
1270 wake_up_all(&ci->i_cap_wq);
1274 static void wake_up_session_caps(struct ceph_mds_session *session,
1277 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1278 iterate_session_caps(session, wake_up_session_cb,
1279 (void *)(unsigned long)reconnect);
1283 * Send periodic message to MDS renewing all currently held caps. The
1284 * ack will reset the expiration for all caps from this session.
1286 * caller holds s_mutex
1288 static int send_renew_caps(struct ceph_mds_client *mdsc,
1289 struct ceph_mds_session *session)
1291 struct ceph_msg *msg;
1294 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1295 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1296 pr_info("mds%d caps stale\n", session->s_mds);
1297 session->s_renew_requested = jiffies;
1299 /* do not try to renew caps until a recovering mds has reconnected
1300 * with its clients. */
1301 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1302 if (state < CEPH_MDS_STATE_RECONNECT) {
1303 dout("send_renew_caps ignoring mds%d (%s)\n",
1304 session->s_mds, ceph_mds_state_name(state));
1308 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1309 ceph_mds_state_name(state));
1310 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1311 ++session->s_renew_seq);
1314 ceph_con_send(&session->s_con, msg);
1318 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1319 struct ceph_mds_session *session, u64 seq)
1321 struct ceph_msg *msg;
1323 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1324 session->s_mds, ceph_session_state_name(session->s_state), seq);
1325 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1328 ceph_con_send(&session->s_con, msg);
1334 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1336 * Called under session->s_mutex
1338 static void renewed_caps(struct ceph_mds_client *mdsc,
1339 struct ceph_mds_session *session, int is_renew)
1344 spin_lock(&session->s_cap_lock);
1345 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1347 session->s_cap_ttl = session->s_renew_requested +
1348 mdsc->mdsmap->m_session_timeout*HZ;
1351 if (time_before(jiffies, session->s_cap_ttl)) {
1352 pr_info("mds%d caps renewed\n", session->s_mds);
1355 pr_info("mds%d caps still stale\n", session->s_mds);
1358 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1359 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1360 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1361 spin_unlock(&session->s_cap_lock);
1364 wake_up_session_caps(session, 0);
1368 * send a session close request
1370 static int request_close_session(struct ceph_mds_client *mdsc,
1371 struct ceph_mds_session *session)
1373 struct ceph_msg *msg;
1375 dout("request_close_session mds%d state %s seq %lld\n",
1376 session->s_mds, ceph_session_state_name(session->s_state),
1378 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1381 ceph_con_send(&session->s_con, msg);
1386 * Called with s_mutex held.
1388 static int __close_session(struct ceph_mds_client *mdsc,
1389 struct ceph_mds_session *session)
1391 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1393 session->s_state = CEPH_MDS_SESSION_CLOSING;
1394 return request_close_session(mdsc, session);
1398 * Trim old(er) caps.
1400 * Because we can't cache an inode without one or more caps, we do
1401 * this indirectly: if a cap is unused, we prune its aliases, at which
1402 * point the inode will hopefully get dropped to.
1404 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1405 * memory pressure from the MDS, though, so it needn't be perfect.
1407 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1409 struct ceph_mds_session *session = arg;
1410 struct ceph_inode_info *ci = ceph_inode(inode);
1411 int used, wanted, oissued, mine;
1413 if (session->s_trim_caps <= 0)
1416 spin_lock(&ci->i_ceph_lock);
1417 mine = cap->issued | cap->implemented;
1418 used = __ceph_caps_used(ci);
1419 wanted = __ceph_caps_file_wanted(ci);
1420 oissued = __ceph_caps_issued_other(ci, cap);
1422 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1423 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1424 ceph_cap_string(used), ceph_cap_string(wanted));
1425 if (cap == ci->i_auth_cap) {
1426 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1427 !list_empty(&ci->i_cap_snaps))
1429 if ((used | wanted) & CEPH_CAP_ANY_WR)
1432 /* The inode has cached pages, but it's no longer used.
1433 * we can safely drop it */
1434 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1435 !(oissued & CEPH_CAP_FILE_CACHE)) {
1439 if ((used | wanted) & ~oissued & mine)
1440 goto out; /* we need these caps */
1442 session->s_trim_caps--;
1444 /* we aren't the only cap.. just remove us */
1445 __ceph_remove_cap(cap, true);
1447 /* try dropping referring dentries */
1448 spin_unlock(&ci->i_ceph_lock);
1449 d_prune_aliases(inode);
1450 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1451 inode, cap, atomic_read(&inode->i_count));
1456 spin_unlock(&ci->i_ceph_lock);
1461 * Trim session cap count down to some max number.
1463 static int trim_caps(struct ceph_mds_client *mdsc,
1464 struct ceph_mds_session *session,
1467 int trim_caps = session->s_nr_caps - max_caps;
1469 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1470 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1471 if (trim_caps > 0) {
1472 session->s_trim_caps = trim_caps;
1473 iterate_session_caps(session, trim_caps_cb, session);
1474 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1475 session->s_mds, session->s_nr_caps, max_caps,
1476 trim_caps - session->s_trim_caps);
1477 session->s_trim_caps = 0;
1480 ceph_send_cap_releases(mdsc, session);
1484 static int check_caps_flush(struct ceph_mds_client *mdsc,
1489 spin_lock(&mdsc->cap_dirty_lock);
1490 if (!list_empty(&mdsc->cap_flush_list)) {
1491 struct ceph_cap_flush *cf =
1492 list_first_entry(&mdsc->cap_flush_list,
1493 struct ceph_cap_flush, g_list);
1494 if (cf->tid <= want_flush_tid) {
1495 dout("check_caps_flush still flushing tid "
1496 "%llu <= %llu\n", cf->tid, want_flush_tid);
1500 spin_unlock(&mdsc->cap_dirty_lock);
1505 * flush all dirty inode data to disk.
1507 * returns true if we've flushed through want_flush_tid
1509 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1512 dout("check_caps_flush want %llu\n", want_flush_tid);
1514 wait_event(mdsc->cap_flushing_wq,
1515 check_caps_flush(mdsc, want_flush_tid));
1517 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1521 * called under s_mutex
1523 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1524 struct ceph_mds_session *session)
1526 struct ceph_msg *msg = NULL;
1527 struct ceph_mds_cap_release *head;
1528 struct ceph_mds_cap_item *item;
1529 struct ceph_cap *cap;
1530 LIST_HEAD(tmp_list);
1531 int num_cap_releases;
1533 spin_lock(&session->s_cap_lock);
1535 list_splice_init(&session->s_cap_releases, &tmp_list);
1536 num_cap_releases = session->s_num_cap_releases;
1537 session->s_num_cap_releases = 0;
1538 spin_unlock(&session->s_cap_lock);
1540 while (!list_empty(&tmp_list)) {
1542 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1543 PAGE_SIZE, GFP_NOFS, false);
1546 head = msg->front.iov_base;
1547 head->num = cpu_to_le32(0);
1548 msg->front.iov_len = sizeof(*head);
1550 cap = list_first_entry(&tmp_list, struct ceph_cap,
1552 list_del(&cap->session_caps);
1555 head = msg->front.iov_base;
1556 le32_add_cpu(&head->num, 1);
1557 item = msg->front.iov_base + msg->front.iov_len;
1558 item->ino = cpu_to_le64(cap->cap_ino);
1559 item->cap_id = cpu_to_le64(cap->cap_id);
1560 item->migrate_seq = cpu_to_le32(cap->mseq);
1561 item->seq = cpu_to_le32(cap->issue_seq);
1562 msg->front.iov_len += sizeof(*item);
1564 ceph_put_cap(mdsc, cap);
1566 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1567 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1568 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1569 ceph_con_send(&session->s_con, msg);
1574 BUG_ON(num_cap_releases != 0);
1576 spin_lock(&session->s_cap_lock);
1577 if (!list_empty(&session->s_cap_releases))
1579 spin_unlock(&session->s_cap_lock);
1582 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1583 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1584 ceph_con_send(&session->s_con, msg);
1588 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1590 spin_lock(&session->s_cap_lock);
1591 list_splice(&tmp_list, &session->s_cap_releases);
1592 session->s_num_cap_releases += num_cap_releases;
1593 spin_unlock(&session->s_cap_lock);
1600 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1603 struct ceph_inode_info *ci = ceph_inode(dir);
1604 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1605 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1606 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1607 int order, num_entries;
1609 spin_lock(&ci->i_ceph_lock);
1610 num_entries = ci->i_files + ci->i_subdirs;
1611 spin_unlock(&ci->i_ceph_lock);
1612 num_entries = max(num_entries, 1);
1613 num_entries = min(num_entries, opt->max_readdir);
1615 order = get_order(size * num_entries);
1616 while (order >= 0) {
1617 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1620 if (rinfo->dir_entries)
1624 if (!rinfo->dir_entries)
1627 num_entries = (PAGE_SIZE << order) / size;
1628 num_entries = min(num_entries, opt->max_readdir);
1630 rinfo->dir_buf_size = PAGE_SIZE << order;
1631 req->r_num_caps = num_entries + 1;
1632 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1633 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1638 * Create an mds request.
1640 struct ceph_mds_request *
1641 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1643 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1646 return ERR_PTR(-ENOMEM);
1648 mutex_init(&req->r_fill_mutex);
1650 req->r_started = jiffies;
1651 req->r_resend_mds = -1;
1652 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1653 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1655 kref_init(&req->r_kref);
1656 RB_CLEAR_NODE(&req->r_node);
1657 INIT_LIST_HEAD(&req->r_wait);
1658 init_completion(&req->r_completion);
1659 init_completion(&req->r_safe_completion);
1660 INIT_LIST_HEAD(&req->r_unsafe_item);
1662 req->r_stamp = current_fs_time(mdsc->fsc->sb);
1665 req->r_direct_mode = mode;
1670 * return oldest (lowest) request, tid in request tree, 0 if none.
1672 * called under mdsc->mutex.
1674 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1676 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1678 return rb_entry(rb_first(&mdsc->request_tree),
1679 struct ceph_mds_request, r_node);
1682 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1684 return mdsc->oldest_tid;
1688 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1689 * on build_path_from_dentry in fs/cifs/dir.c.
1691 * If @stop_on_nosnap, generate path relative to the first non-snapped
1694 * Encode hidden .snap dirs as a double /, i.e.
1695 * foo/.snap/bar -> foo//bar
1697 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1700 struct dentry *temp;
1706 return ERR_PTR(-EINVAL);
1710 seq = read_seqbegin(&rename_lock);
1712 for (temp = dentry; !IS_ROOT(temp);) {
1713 struct inode *inode = d_inode(temp);
1714 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1715 len++; /* slash only */
1716 else if (stop_on_nosnap && inode &&
1717 ceph_snap(inode) == CEPH_NOSNAP)
1720 len += 1 + temp->d_name.len;
1721 temp = temp->d_parent;
1725 len--; /* no leading '/' */
1727 path = kmalloc(len+1, GFP_NOFS);
1729 return ERR_PTR(-ENOMEM);
1731 path[pos] = 0; /* trailing null */
1733 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1734 struct inode *inode;
1736 spin_lock(&temp->d_lock);
1737 inode = d_inode(temp);
1738 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1739 dout("build_path path+%d: %p SNAPDIR\n",
1741 } else if (stop_on_nosnap && inode &&
1742 ceph_snap(inode) == CEPH_NOSNAP) {
1743 spin_unlock(&temp->d_lock);
1746 pos -= temp->d_name.len;
1748 spin_unlock(&temp->d_lock);
1751 strncpy(path + pos, temp->d_name.name,
1754 spin_unlock(&temp->d_lock);
1757 temp = temp->d_parent;
1760 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1761 pr_err("build_path did not end path lookup where "
1762 "expected, namelen is %d, pos is %d\n", len, pos);
1763 /* presumably this is only possible if racing with a
1764 rename of one of the parent directories (we can not
1765 lock the dentries above us to prevent this, but
1766 retrying should be harmless) */
1771 *base = ceph_ino(d_inode(temp));
1773 dout("build_path on %p %d built %llx '%.*s'\n",
1774 dentry, d_count(dentry), *base, len, path);
1778 static int build_dentry_path(struct dentry *dentry,
1779 const char **ppath, int *ppathlen, u64 *pino,
1784 if (ceph_snap(d_inode(dentry->d_parent)) == CEPH_NOSNAP) {
1785 *pino = ceph_ino(d_inode(dentry->d_parent));
1786 *ppath = dentry->d_name.name;
1787 *ppathlen = dentry->d_name.len;
1790 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1792 return PTR_ERR(path);
1798 static int build_inode_path(struct inode *inode,
1799 const char **ppath, int *ppathlen, u64 *pino,
1802 struct dentry *dentry;
1805 if (ceph_snap(inode) == CEPH_NOSNAP) {
1806 *pino = ceph_ino(inode);
1810 dentry = d_find_alias(inode);
1811 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1814 return PTR_ERR(path);
1821 * request arguments may be specified via an inode *, a dentry *, or
1822 * an explicit ino+path.
1824 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1825 const char *rpath, u64 rino,
1826 const char **ppath, int *pathlen,
1827 u64 *ino, int *freepath)
1832 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1833 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1835 } else if (rdentry) {
1836 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1837 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1839 } else if (rpath || rino) {
1842 *pathlen = rpath ? strlen(rpath) : 0;
1843 dout(" path %.*s\n", *pathlen, rpath);
1850 * called under mdsc->mutex
1852 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1853 struct ceph_mds_request *req,
1854 int mds, bool drop_cap_releases)
1856 struct ceph_msg *msg;
1857 struct ceph_mds_request_head *head;
1858 const char *path1 = NULL;
1859 const char *path2 = NULL;
1860 u64 ino1 = 0, ino2 = 0;
1861 int pathlen1 = 0, pathlen2 = 0;
1862 int freepath1 = 0, freepath2 = 0;
1868 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1869 req->r_path1, req->r_ino1.ino,
1870 &path1, &pathlen1, &ino1, &freepath1);
1876 ret = set_request_path_attr(NULL, req->r_old_dentry,
1877 req->r_path2, req->r_ino2.ino,
1878 &path2, &pathlen2, &ino2, &freepath2);
1884 len = sizeof(*head) +
1885 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1886 sizeof(struct ceph_timespec);
1888 /* calculate (max) length for cap releases */
1889 len += sizeof(struct ceph_mds_request_release) *
1890 (!!req->r_inode_drop + !!req->r_dentry_drop +
1891 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1892 if (req->r_dentry_drop)
1893 len += req->r_dentry->d_name.len;
1894 if (req->r_old_dentry_drop)
1895 len += req->r_old_dentry->d_name.len;
1897 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1899 msg = ERR_PTR(-ENOMEM);
1903 msg->hdr.version = cpu_to_le16(2);
1904 msg->hdr.tid = cpu_to_le64(req->r_tid);
1906 head = msg->front.iov_base;
1907 p = msg->front.iov_base + sizeof(*head);
1908 end = msg->front.iov_base + msg->front.iov_len;
1910 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1911 head->op = cpu_to_le32(req->r_op);
1912 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1913 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1914 head->args = req->r_args;
1916 ceph_encode_filepath(&p, end, ino1, path1);
1917 ceph_encode_filepath(&p, end, ino2, path2);
1919 /* make note of release offset, in case we need to replay */
1920 req->r_request_release_offset = p - msg->front.iov_base;
1924 if (req->r_inode_drop)
1925 releases += ceph_encode_inode_release(&p,
1926 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1927 mds, req->r_inode_drop, req->r_inode_unless, 0);
1928 if (req->r_dentry_drop)
1929 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1930 mds, req->r_dentry_drop, req->r_dentry_unless);
1931 if (req->r_old_dentry_drop)
1932 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1933 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1934 if (req->r_old_inode_drop)
1935 releases += ceph_encode_inode_release(&p,
1936 d_inode(req->r_old_dentry),
1937 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1939 if (drop_cap_releases) {
1941 p = msg->front.iov_base + req->r_request_release_offset;
1944 head->num_releases = cpu_to_le16(releases);
1948 struct ceph_timespec ts;
1949 ceph_encode_timespec(&ts, &req->r_stamp);
1950 ceph_encode_copy(&p, &ts, sizeof(ts));
1954 msg->front.iov_len = p - msg->front.iov_base;
1955 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1957 if (req->r_pagelist) {
1958 struct ceph_pagelist *pagelist = req->r_pagelist;
1959 atomic_inc(&pagelist->refcnt);
1960 ceph_msg_data_add_pagelist(msg, pagelist);
1961 msg->hdr.data_len = cpu_to_le32(pagelist->length);
1963 msg->hdr.data_len = 0;
1966 msg->hdr.data_off = cpu_to_le16(0);
1970 kfree((char *)path2);
1973 kfree((char *)path1);
1979 * called under mdsc->mutex if error, under no mutex if
1982 static void complete_request(struct ceph_mds_client *mdsc,
1983 struct ceph_mds_request *req)
1985 if (req->r_callback)
1986 req->r_callback(mdsc, req);
1988 complete_all(&req->r_completion);
1992 * called under mdsc->mutex
1994 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1995 struct ceph_mds_request *req,
1996 int mds, bool drop_cap_releases)
1998 struct ceph_mds_request_head *rhead;
1999 struct ceph_msg *msg;
2004 struct ceph_cap *cap =
2005 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2008 req->r_sent_on_mseq = cap->mseq;
2010 req->r_sent_on_mseq = -1;
2012 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2013 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2015 if (req->r_got_unsafe) {
2018 * Replay. Do not regenerate message (and rebuild
2019 * paths, etc.); just use the original message.
2020 * Rebuilding paths will break for renames because
2021 * d_move mangles the src name.
2023 msg = req->r_request;
2024 rhead = msg->front.iov_base;
2026 flags = le32_to_cpu(rhead->flags);
2027 flags |= CEPH_MDS_FLAG_REPLAY;
2028 rhead->flags = cpu_to_le32(flags);
2030 if (req->r_target_inode)
2031 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2033 rhead->num_retry = req->r_attempts - 1;
2035 /* remove cap/dentry releases from message */
2036 rhead->num_releases = 0;
2039 p = msg->front.iov_base + req->r_request_release_offset;
2041 struct ceph_timespec ts;
2042 ceph_encode_timespec(&ts, &req->r_stamp);
2043 ceph_encode_copy(&p, &ts, sizeof(ts));
2046 msg->front.iov_len = p - msg->front.iov_base;
2047 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2051 if (req->r_request) {
2052 ceph_msg_put(req->r_request);
2053 req->r_request = NULL;
2055 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2057 req->r_err = PTR_ERR(msg);
2058 return PTR_ERR(msg);
2060 req->r_request = msg;
2062 rhead = msg->front.iov_base;
2063 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2064 if (req->r_got_unsafe)
2065 flags |= CEPH_MDS_FLAG_REPLAY;
2066 if (req->r_locked_dir)
2067 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2068 rhead->flags = cpu_to_le32(flags);
2069 rhead->num_fwd = req->r_num_fwd;
2070 rhead->num_retry = req->r_attempts - 1;
2073 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2078 * send request, or put it on the appropriate wait list.
2080 static int __do_request(struct ceph_mds_client *mdsc,
2081 struct ceph_mds_request *req)
2083 struct ceph_mds_session *session = NULL;
2087 if (req->r_err || req->r_got_result) {
2089 __unregister_request(mdsc, req);
2093 if (req->r_timeout &&
2094 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2095 dout("do_request timed out\n");
2099 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2100 dout("do_request forced umount\n");
2104 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2105 if (mdsc->mdsmap_err) {
2106 err = mdsc->mdsmap_err;
2107 dout("do_request mdsmap err %d\n", err);
2110 if (mdsc->mdsmap->m_epoch == 0) {
2111 dout("do_request no mdsmap, waiting for map\n");
2112 list_add(&req->r_wait, &mdsc->waiting_for_map);
2115 if (!(mdsc->fsc->mount_options->flags &
2116 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2117 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2119 pr_info("probably no mds server is up\n");
2124 put_request_session(req);
2126 mds = __choose_mds(mdsc, req);
2128 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2129 dout("do_request no mds or not active, waiting for map\n");
2130 list_add(&req->r_wait, &mdsc->waiting_for_map);
2134 /* get, open session */
2135 session = __ceph_lookup_mds_session(mdsc, mds);
2137 session = register_session(mdsc, mds);
2138 if (IS_ERR(session)) {
2139 err = PTR_ERR(session);
2143 req->r_session = get_session(session);
2145 dout("do_request mds%d session %p state %s\n", mds, session,
2146 ceph_session_state_name(session->s_state));
2147 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2148 session->s_state != CEPH_MDS_SESSION_HUNG) {
2149 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2153 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2154 session->s_state == CEPH_MDS_SESSION_CLOSING)
2155 __open_session(mdsc, session);
2156 list_add(&req->r_wait, &session->s_waiting);
2161 req->r_resend_mds = -1; /* forget any previous mds hint */
2163 if (req->r_request_started == 0) /* note request start time */
2164 req->r_request_started = jiffies;
2166 err = __prepare_send_request(mdsc, req, mds, false);
2168 ceph_msg_get(req->r_request);
2169 ceph_con_send(&session->s_con, req->r_request);
2173 ceph_put_mds_session(session);
2176 dout("__do_request early error %d\n", err);
2178 complete_request(mdsc, req);
2179 __unregister_request(mdsc, req);
2186 * called under mdsc->mutex
2188 static void __wake_requests(struct ceph_mds_client *mdsc,
2189 struct list_head *head)
2191 struct ceph_mds_request *req;
2192 LIST_HEAD(tmp_list);
2194 list_splice_init(head, &tmp_list);
2196 while (!list_empty(&tmp_list)) {
2197 req = list_entry(tmp_list.next,
2198 struct ceph_mds_request, r_wait);
2199 list_del_init(&req->r_wait);
2200 dout(" wake request %p tid %llu\n", req, req->r_tid);
2201 __do_request(mdsc, req);
2206 * Wake up threads with requests pending for @mds, so that they can
2207 * resubmit their requests to a possibly different mds.
2209 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2211 struct ceph_mds_request *req;
2212 struct rb_node *p = rb_first(&mdsc->request_tree);
2214 dout("kick_requests mds%d\n", mds);
2216 req = rb_entry(p, struct ceph_mds_request, r_node);
2218 if (req->r_got_unsafe)
2220 if (req->r_attempts > 0)
2221 continue; /* only new requests */
2222 if (req->r_session &&
2223 req->r_session->s_mds == mds) {
2224 dout(" kicking tid %llu\n", req->r_tid);
2225 list_del_init(&req->r_wait);
2226 __do_request(mdsc, req);
2231 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2232 struct ceph_mds_request *req)
2234 dout("submit_request on %p\n", req);
2235 mutex_lock(&mdsc->mutex);
2236 __register_request(mdsc, req, NULL);
2237 __do_request(mdsc, req);
2238 mutex_unlock(&mdsc->mutex);
2242 * Synchrously perform an mds request. Take care of all of the
2243 * session setup, forwarding, retry details.
2245 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2247 struct ceph_mds_request *req)
2251 dout("do_request on %p\n", req);
2253 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2255 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2256 if (req->r_locked_dir)
2257 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2258 if (req->r_old_dentry_dir)
2259 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2263 mutex_lock(&mdsc->mutex);
2264 __register_request(mdsc, req, dir);
2265 __do_request(mdsc, req);
2273 mutex_unlock(&mdsc->mutex);
2274 dout("do_request waiting\n");
2275 if (!req->r_timeout && req->r_wait_for_completion) {
2276 err = req->r_wait_for_completion(mdsc, req);
2278 long timeleft = wait_for_completion_killable_timeout(
2280 ceph_timeout_jiffies(req->r_timeout));
2284 err = -EIO; /* timed out */
2286 err = timeleft; /* killed */
2288 dout("do_request waited, got %d\n", err);
2289 mutex_lock(&mdsc->mutex);
2291 /* only abort if we didn't race with a real reply */
2292 if (req->r_got_result) {
2293 err = le32_to_cpu(req->r_reply_info.head->result);
2294 } else if (err < 0) {
2295 dout("aborted request %lld with %d\n", req->r_tid, err);
2298 * ensure we aren't running concurrently with
2299 * ceph_fill_trace or ceph_readdir_prepopulate, which
2300 * rely on locks (dir mutex) held by our caller.
2302 mutex_lock(&req->r_fill_mutex);
2304 req->r_aborted = true;
2305 mutex_unlock(&req->r_fill_mutex);
2307 if (req->r_locked_dir &&
2308 (req->r_op & CEPH_MDS_OP_WRITE))
2309 ceph_invalidate_dir_request(req);
2315 mutex_unlock(&mdsc->mutex);
2316 dout("do_request %p done, result %d\n", req, err);
2321 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2322 * namespace request.
2324 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2326 struct inode *inode = req->r_locked_dir;
2328 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2330 ceph_dir_clear_complete(inode);
2332 ceph_invalidate_dentry_lease(req->r_dentry);
2333 if (req->r_old_dentry)
2334 ceph_invalidate_dentry_lease(req->r_old_dentry);
2340 * We take the session mutex and parse and process the reply immediately.
2341 * This preserves the logical ordering of replies, capabilities, etc., sent
2342 * by the MDS as they are applied to our local cache.
2344 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2346 struct ceph_mds_client *mdsc = session->s_mdsc;
2347 struct ceph_mds_request *req;
2348 struct ceph_mds_reply_head *head = msg->front.iov_base;
2349 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2350 struct ceph_snap_realm *realm;
2353 int mds = session->s_mds;
2355 if (msg->front.iov_len < sizeof(*head)) {
2356 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2361 /* get request, session */
2362 tid = le64_to_cpu(msg->hdr.tid);
2363 mutex_lock(&mdsc->mutex);
2364 req = lookup_get_request(mdsc, tid);
2366 dout("handle_reply on unknown tid %llu\n", tid);
2367 mutex_unlock(&mdsc->mutex);
2370 dout("handle_reply %p\n", req);
2372 /* correct session? */
2373 if (req->r_session != session) {
2374 pr_err("mdsc_handle_reply got %llu on session mds%d"
2375 " not mds%d\n", tid, session->s_mds,
2376 req->r_session ? req->r_session->s_mds : -1);
2377 mutex_unlock(&mdsc->mutex);
2382 if ((req->r_got_unsafe && !head->safe) ||
2383 (req->r_got_safe && head->safe)) {
2384 pr_warn("got a dup %s reply on %llu from mds%d\n",
2385 head->safe ? "safe" : "unsafe", tid, mds);
2386 mutex_unlock(&mdsc->mutex);
2389 if (req->r_got_safe) {
2390 pr_warn("got unsafe after safe on %llu from mds%d\n",
2392 mutex_unlock(&mdsc->mutex);
2396 result = le32_to_cpu(head->result);
2400 * if we're not talking to the authority, send to them
2401 * if the authority has changed while we weren't looking,
2402 * send to new authority
2403 * Otherwise we just have to return an ESTALE
2405 if (result == -ESTALE) {
2406 dout("got ESTALE on request %llu", req->r_tid);
2407 req->r_resend_mds = -1;
2408 if (req->r_direct_mode != USE_AUTH_MDS) {
2409 dout("not using auth, setting for that now");
2410 req->r_direct_mode = USE_AUTH_MDS;
2411 __do_request(mdsc, req);
2412 mutex_unlock(&mdsc->mutex);
2415 int mds = __choose_mds(mdsc, req);
2416 if (mds >= 0 && mds != req->r_session->s_mds) {
2417 dout("but auth changed, so resending");
2418 __do_request(mdsc, req);
2419 mutex_unlock(&mdsc->mutex);
2423 dout("have to return ESTALE on request %llu", req->r_tid);
2428 req->r_got_safe = true;
2429 __unregister_request(mdsc, req);
2431 if (req->r_got_unsafe) {
2433 * We already handled the unsafe response, now do the
2434 * cleanup. No need to examine the response; the MDS
2435 * doesn't include any result info in the safe
2436 * response. And even if it did, there is nothing
2437 * useful we could do with a revised return value.
2439 dout("got safe reply %llu, mds%d\n", tid, mds);
2440 list_del_init(&req->r_unsafe_item);
2442 /* last unsafe request during umount? */
2443 if (mdsc->stopping && !__get_oldest_req(mdsc))
2444 complete_all(&mdsc->safe_umount_waiters);
2445 mutex_unlock(&mdsc->mutex);
2449 req->r_got_unsafe = true;
2450 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2451 if (req->r_unsafe_dir) {
2452 struct ceph_inode_info *ci =
2453 ceph_inode(req->r_unsafe_dir);
2454 spin_lock(&ci->i_unsafe_lock);
2455 list_add_tail(&req->r_unsafe_dir_item,
2456 &ci->i_unsafe_dirops);
2457 spin_unlock(&ci->i_unsafe_lock);
2461 dout("handle_reply tid %lld result %d\n", tid, result);
2462 rinfo = &req->r_reply_info;
2463 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2464 mutex_unlock(&mdsc->mutex);
2466 mutex_lock(&session->s_mutex);
2468 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2475 if (rinfo->snapblob_len) {
2476 down_write(&mdsc->snap_rwsem);
2477 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2478 rinfo->snapblob + rinfo->snapblob_len,
2479 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2481 downgrade_write(&mdsc->snap_rwsem);
2483 down_read(&mdsc->snap_rwsem);
2486 /* insert trace into our cache */
2487 mutex_lock(&req->r_fill_mutex);
2488 current->journal_info = req;
2489 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2491 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2492 req->r_op == CEPH_MDS_OP_LSSNAP))
2493 ceph_readdir_prepopulate(req, req->r_session);
2494 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2496 current->journal_info = NULL;
2497 mutex_unlock(&req->r_fill_mutex);
2499 up_read(&mdsc->snap_rwsem);
2501 ceph_put_snap_realm(mdsc, realm);
2503 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2504 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2505 spin_lock(&ci->i_unsafe_lock);
2506 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2507 spin_unlock(&ci->i_unsafe_lock);
2510 mutex_lock(&mdsc->mutex);
2511 if (!req->r_aborted) {
2515 req->r_reply = ceph_msg_get(msg);
2516 req->r_got_result = true;
2519 dout("reply arrived after request %lld was aborted\n", tid);
2521 mutex_unlock(&mdsc->mutex);
2523 mutex_unlock(&session->s_mutex);
2525 /* kick calling process */
2526 complete_request(mdsc, req);
2528 ceph_mdsc_put_request(req);
2535 * handle mds notification that our request has been forwarded.
2537 static void handle_forward(struct ceph_mds_client *mdsc,
2538 struct ceph_mds_session *session,
2539 struct ceph_msg *msg)
2541 struct ceph_mds_request *req;
2542 u64 tid = le64_to_cpu(msg->hdr.tid);
2546 void *p = msg->front.iov_base;
2547 void *end = p + msg->front.iov_len;
2549 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2550 next_mds = ceph_decode_32(&p);
2551 fwd_seq = ceph_decode_32(&p);
2553 mutex_lock(&mdsc->mutex);
2554 req = lookup_get_request(mdsc, tid);
2556 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2557 goto out; /* dup reply? */
2560 if (req->r_aborted) {
2561 dout("forward tid %llu aborted, unregistering\n", tid);
2562 __unregister_request(mdsc, req);
2563 } else if (fwd_seq <= req->r_num_fwd) {
2564 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2565 tid, next_mds, req->r_num_fwd, fwd_seq);
2567 /* resend. forward race not possible; mds would drop */
2568 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2570 BUG_ON(req->r_got_result);
2571 req->r_attempts = 0;
2572 req->r_num_fwd = fwd_seq;
2573 req->r_resend_mds = next_mds;
2574 put_request_session(req);
2575 __do_request(mdsc, req);
2577 ceph_mdsc_put_request(req);
2579 mutex_unlock(&mdsc->mutex);
2583 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2587 * handle a mds session control message
2589 static void handle_session(struct ceph_mds_session *session,
2590 struct ceph_msg *msg)
2592 struct ceph_mds_client *mdsc = session->s_mdsc;
2595 int mds = session->s_mds;
2596 struct ceph_mds_session_head *h = msg->front.iov_base;
2600 if (msg->front.iov_len != sizeof(*h))
2602 op = le32_to_cpu(h->op);
2603 seq = le64_to_cpu(h->seq);
2605 mutex_lock(&mdsc->mutex);
2606 if (op == CEPH_SESSION_CLOSE)
2607 __unregister_session(mdsc, session);
2608 /* FIXME: this ttl calculation is generous */
2609 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2610 mutex_unlock(&mdsc->mutex);
2612 mutex_lock(&session->s_mutex);
2614 dout("handle_session mds%d %s %p state %s seq %llu\n",
2615 mds, ceph_session_op_name(op), session,
2616 ceph_session_state_name(session->s_state), seq);
2618 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2619 session->s_state = CEPH_MDS_SESSION_OPEN;
2620 pr_info("mds%d came back\n", session->s_mds);
2624 case CEPH_SESSION_OPEN:
2625 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2626 pr_info("mds%d reconnect success\n", session->s_mds);
2627 session->s_state = CEPH_MDS_SESSION_OPEN;
2628 renewed_caps(mdsc, session, 0);
2631 __close_session(mdsc, session);
2634 case CEPH_SESSION_RENEWCAPS:
2635 if (session->s_renew_seq == seq)
2636 renewed_caps(mdsc, session, 1);
2639 case CEPH_SESSION_CLOSE:
2640 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2641 pr_info("mds%d reconnect denied\n", session->s_mds);
2642 cleanup_session_requests(mdsc, session);
2643 remove_session_caps(session);
2644 wake = 2; /* for good measure */
2645 wake_up_all(&mdsc->session_close_wq);
2648 case CEPH_SESSION_STALE:
2649 pr_info("mds%d caps went stale, renewing\n",
2651 spin_lock(&session->s_gen_ttl_lock);
2652 session->s_cap_gen++;
2653 session->s_cap_ttl = jiffies - 1;
2654 spin_unlock(&session->s_gen_ttl_lock);
2655 send_renew_caps(mdsc, session);
2658 case CEPH_SESSION_RECALL_STATE:
2659 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2662 case CEPH_SESSION_FLUSHMSG:
2663 send_flushmsg_ack(mdsc, session, seq);
2666 case CEPH_SESSION_FORCE_RO:
2667 dout("force_session_readonly %p\n", session);
2668 spin_lock(&session->s_cap_lock);
2669 session->s_readonly = true;
2670 spin_unlock(&session->s_cap_lock);
2671 wake_up_session_caps(session, 0);
2674 case CEPH_SESSION_REJECT:
2675 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2676 pr_info("mds%d rejected session\n", session->s_mds);
2677 session->s_state = CEPH_MDS_SESSION_REJECTED;
2678 cleanup_session_requests(mdsc, session);
2679 remove_session_caps(session);
2680 wake = 2; /* for good measure */
2684 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2688 mutex_unlock(&session->s_mutex);
2690 mutex_lock(&mdsc->mutex);
2691 __wake_requests(mdsc, &session->s_waiting);
2693 kick_requests(mdsc, mds);
2694 mutex_unlock(&mdsc->mutex);
2699 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2700 (int)msg->front.iov_len);
2707 * called under session->mutex.
2709 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2710 struct ceph_mds_session *session)
2712 struct ceph_mds_request *req, *nreq;
2716 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2718 mutex_lock(&mdsc->mutex);
2719 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2720 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2722 ceph_msg_get(req->r_request);
2723 ceph_con_send(&session->s_con, req->r_request);
2728 * also re-send old requests when MDS enters reconnect stage. So that MDS
2729 * can process completed request in clientreplay stage.
2731 p = rb_first(&mdsc->request_tree);
2733 req = rb_entry(p, struct ceph_mds_request, r_node);
2735 if (req->r_got_unsafe)
2737 if (req->r_attempts == 0)
2738 continue; /* only old requests */
2739 if (req->r_session &&
2740 req->r_session->s_mds == session->s_mds) {
2741 err = __prepare_send_request(mdsc, req,
2742 session->s_mds, true);
2744 ceph_msg_get(req->r_request);
2745 ceph_con_send(&session->s_con, req->r_request);
2749 mutex_unlock(&mdsc->mutex);
2753 * Encode information about a cap for a reconnect with the MDS.
2755 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2759 struct ceph_mds_cap_reconnect v2;
2760 struct ceph_mds_cap_reconnect_v1 v1;
2762 struct ceph_inode_info *ci;
2763 struct ceph_reconnect_state *recon_state = arg;
2764 struct ceph_pagelist *pagelist = recon_state->pagelist;
2769 struct dentry *dentry;
2773 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2774 inode, ceph_vinop(inode), cap, cap->cap_id,
2775 ceph_cap_string(cap->issued));
2776 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2780 dentry = d_find_alias(inode);
2782 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2784 err = PTR_ERR(path);
2793 spin_lock(&ci->i_ceph_lock);
2794 cap->seq = 0; /* reset cap seq */
2795 cap->issue_seq = 0; /* and issue_seq */
2796 cap->mseq = 0; /* and migrate_seq */
2797 cap->cap_gen = cap->session->s_cap_gen;
2799 if (recon_state->msg_version >= 2) {
2800 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2801 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2802 rec.v2.issued = cpu_to_le32(cap->issued);
2803 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2804 rec.v2.pathbase = cpu_to_le64(pathbase);
2805 rec.v2.flock_len = 0;
2807 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2808 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2809 rec.v1.issued = cpu_to_le32(cap->issued);
2810 rec.v1.size = cpu_to_le64(inode->i_size);
2811 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2812 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2813 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2814 rec.v1.pathbase = cpu_to_le64(pathbase);
2817 if (list_empty(&ci->i_cap_snaps)) {
2820 struct ceph_cap_snap *capsnap =
2821 list_first_entry(&ci->i_cap_snaps,
2822 struct ceph_cap_snap, ci_item);
2823 snap_follows = capsnap->follows;
2825 spin_unlock(&ci->i_ceph_lock);
2827 if (recon_state->msg_version >= 2) {
2828 int num_fcntl_locks, num_flock_locks;
2829 struct ceph_filelock *flocks;
2830 size_t struct_len, total_len = 0;
2834 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2835 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2836 sizeof(struct ceph_filelock), GFP_NOFS);
2841 err = ceph_encode_locks_to_buffer(inode, flocks,
2851 if (recon_state->msg_version >= 3) {
2852 /* version, compat_version and struct_len */
2853 total_len = 2 * sizeof(u8) + sizeof(u32);
2857 * number of encoded locks is stable, so copy to pagelist
2859 struct_len = 2 * sizeof(u32) +
2860 (num_fcntl_locks + num_flock_locks) *
2861 sizeof(struct ceph_filelock);
2862 rec.v2.flock_len = cpu_to_le32(struct_len);
2864 struct_len += sizeof(rec.v2);
2865 struct_len += sizeof(u32) + pathlen;
2868 struct_len += sizeof(u64); /* snap_follows */
2870 total_len += struct_len;
2871 err = ceph_pagelist_reserve(pagelist, total_len);
2874 if (recon_state->msg_version >= 3) {
2875 ceph_pagelist_encode_8(pagelist, struct_v);
2876 ceph_pagelist_encode_8(pagelist, 1);
2877 ceph_pagelist_encode_32(pagelist, struct_len);
2879 ceph_pagelist_encode_string(pagelist, path, pathlen);
2880 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2881 ceph_locks_to_pagelist(flocks, pagelist,
2885 ceph_pagelist_encode_64(pagelist, snap_follows);
2889 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2890 err = ceph_pagelist_reserve(pagelist, size);
2892 ceph_pagelist_encode_string(pagelist, path, pathlen);
2893 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2897 recon_state->nr_caps++;
2907 * If an MDS fails and recovers, clients need to reconnect in order to
2908 * reestablish shared state. This includes all caps issued through
2909 * this session _and_ the snap_realm hierarchy. Because it's not
2910 * clear which snap realms the mds cares about, we send everything we
2911 * know about.. that ensures we'll then get any new info the
2912 * recovering MDS might have.
2914 * This is a relatively heavyweight operation, but it's rare.
2916 * called with mdsc->mutex held.
2918 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2919 struct ceph_mds_session *session)
2921 struct ceph_msg *reply;
2923 int mds = session->s_mds;
2926 struct ceph_pagelist *pagelist;
2927 struct ceph_reconnect_state recon_state;
2929 pr_info("mds%d reconnect start\n", mds);
2931 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2933 goto fail_nopagelist;
2934 ceph_pagelist_init(pagelist);
2936 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2940 mutex_lock(&session->s_mutex);
2941 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2944 dout("session %p state %s\n", session,
2945 ceph_session_state_name(session->s_state));
2947 spin_lock(&session->s_gen_ttl_lock);
2948 session->s_cap_gen++;
2949 spin_unlock(&session->s_gen_ttl_lock);
2951 spin_lock(&session->s_cap_lock);
2952 /* don't know if session is readonly */
2953 session->s_readonly = 0;
2955 * notify __ceph_remove_cap() that we are composing cap reconnect.
2956 * If a cap get released before being added to the cap reconnect,
2957 * __ceph_remove_cap() should skip queuing cap release.
2959 session->s_cap_reconnect = 1;
2960 /* drop old cap expires; we're about to reestablish that state */
2961 cleanup_cap_releases(mdsc, session);
2963 /* trim unused caps to reduce MDS's cache rejoin time */
2964 if (mdsc->fsc->sb->s_root)
2965 shrink_dcache_parent(mdsc->fsc->sb->s_root);
2967 ceph_con_close(&session->s_con);
2968 ceph_con_open(&session->s_con,
2969 CEPH_ENTITY_TYPE_MDS, mds,
2970 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2972 /* replay unsafe requests */
2973 replay_unsafe_requests(mdsc, session);
2975 down_read(&mdsc->snap_rwsem);
2977 /* traverse this session's caps */
2978 s_nr_caps = session->s_nr_caps;
2979 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
2983 recon_state.nr_caps = 0;
2984 recon_state.pagelist = pagelist;
2985 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
2986 recon_state.msg_version = 3;
2987 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
2988 recon_state.msg_version = 2;
2990 recon_state.msg_version = 1;
2991 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2995 spin_lock(&session->s_cap_lock);
2996 session->s_cap_reconnect = 0;
2997 spin_unlock(&session->s_cap_lock);
3000 * snaprealms. we provide mds with the ino, seq (version), and
3001 * parent for all of our realms. If the mds has any newer info,
3004 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3005 struct ceph_snap_realm *realm =
3006 rb_entry(p, struct ceph_snap_realm, node);
3007 struct ceph_mds_snaprealm_reconnect sr_rec;
3009 dout(" adding snap realm %llx seq %lld parent %llx\n",
3010 realm->ino, realm->seq, realm->parent_ino);
3011 sr_rec.ino = cpu_to_le64(realm->ino);
3012 sr_rec.seq = cpu_to_le64(realm->seq);
3013 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3014 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3019 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3021 /* raced with cap release? */
3022 if (s_nr_caps != recon_state.nr_caps) {
3023 struct page *page = list_first_entry(&pagelist->head,
3025 __le32 *addr = kmap_atomic(page);
3026 *addr = cpu_to_le32(recon_state.nr_caps);
3027 kunmap_atomic(addr);
3030 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3031 ceph_msg_data_add_pagelist(reply, pagelist);
3033 ceph_early_kick_flushing_caps(mdsc, session);
3035 ceph_con_send(&session->s_con, reply);
3037 mutex_unlock(&session->s_mutex);
3039 mutex_lock(&mdsc->mutex);
3040 __wake_requests(mdsc, &session->s_waiting);
3041 mutex_unlock(&mdsc->mutex);
3043 up_read(&mdsc->snap_rwsem);
3047 ceph_msg_put(reply);
3048 up_read(&mdsc->snap_rwsem);
3049 mutex_unlock(&session->s_mutex);
3051 ceph_pagelist_release(pagelist);
3053 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3059 * compare old and new mdsmaps, kicking requests
3060 * and closing out old connections as necessary
3062 * called under mdsc->mutex.
3064 static void check_new_map(struct ceph_mds_client *mdsc,
3065 struct ceph_mdsmap *newmap,
3066 struct ceph_mdsmap *oldmap)
3069 int oldstate, newstate;
3070 struct ceph_mds_session *s;
3072 dout("check_new_map new %u old %u\n",
3073 newmap->m_epoch, oldmap->m_epoch);
3075 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3076 if (mdsc->sessions[i] == NULL)
3078 s = mdsc->sessions[i];
3079 oldstate = ceph_mdsmap_get_state(oldmap, i);
3080 newstate = ceph_mdsmap_get_state(newmap, i);
3082 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3083 i, ceph_mds_state_name(oldstate),
3084 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3085 ceph_mds_state_name(newstate),
3086 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3087 ceph_session_state_name(s->s_state));
3089 if (i >= newmap->m_max_mds ||
3090 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3091 ceph_mdsmap_get_addr(newmap, i),
3092 sizeof(struct ceph_entity_addr))) {
3093 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3094 /* the session never opened, just close it
3096 __wake_requests(mdsc, &s->s_waiting);
3097 __unregister_session(mdsc, s);
3100 mutex_unlock(&mdsc->mutex);
3101 mutex_lock(&s->s_mutex);
3102 mutex_lock(&mdsc->mutex);
3103 ceph_con_close(&s->s_con);
3104 mutex_unlock(&s->s_mutex);
3105 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3107 } else if (oldstate == newstate) {
3108 continue; /* nothing new with this mds */
3114 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3115 newstate >= CEPH_MDS_STATE_RECONNECT) {
3116 mutex_unlock(&mdsc->mutex);
3117 send_mds_reconnect(mdsc, s);
3118 mutex_lock(&mdsc->mutex);
3122 * kick request on any mds that has gone active.
3124 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3125 newstate >= CEPH_MDS_STATE_ACTIVE) {
3126 if (oldstate != CEPH_MDS_STATE_CREATING &&
3127 oldstate != CEPH_MDS_STATE_STARTING)
3128 pr_info("mds%d recovery completed\n", s->s_mds);
3129 kick_requests(mdsc, i);
3130 ceph_kick_flushing_caps(mdsc, s);
3131 wake_up_session_caps(s, 1);
3135 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3136 s = mdsc->sessions[i];
3139 if (!ceph_mdsmap_is_laggy(newmap, i))
3141 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3142 s->s_state == CEPH_MDS_SESSION_HUNG ||
3143 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3144 dout(" connecting to export targets of laggy mds%d\n",
3146 __open_export_target_sessions(mdsc, s);
3158 * caller must hold session s_mutex, dentry->d_lock
3160 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3162 struct ceph_dentry_info *di = ceph_dentry(dentry);
3164 ceph_put_mds_session(di->lease_session);
3165 di->lease_session = NULL;
3168 static void handle_lease(struct ceph_mds_client *mdsc,
3169 struct ceph_mds_session *session,
3170 struct ceph_msg *msg)
3172 struct super_block *sb = mdsc->fsc->sb;
3173 struct inode *inode;
3174 struct dentry *parent, *dentry;
3175 struct ceph_dentry_info *di;
3176 int mds = session->s_mds;
3177 struct ceph_mds_lease *h = msg->front.iov_base;
3179 struct ceph_vino vino;
3183 dout("handle_lease from mds%d\n", mds);
3186 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3188 vino.ino = le64_to_cpu(h->ino);
3189 vino.snap = CEPH_NOSNAP;
3190 seq = le32_to_cpu(h->seq);
3191 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3192 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3193 if (dname.len != get_unaligned_le32(h+1))
3197 inode = ceph_find_inode(sb, vino);
3198 dout("handle_lease %s, ino %llx %p %.*s\n",
3199 ceph_lease_op_name(h->action), vino.ino, inode,
3200 dname.len, dname.name);
3202 mutex_lock(&session->s_mutex);
3205 if (inode == NULL) {
3206 dout("handle_lease no inode %llx\n", vino.ino);
3211 parent = d_find_alias(inode);
3213 dout("no parent dentry on inode %p\n", inode);
3215 goto release; /* hrm... */
3217 dname.hash = full_name_hash(parent, dname.name, dname.len);
3218 dentry = d_lookup(parent, &dname);
3223 spin_lock(&dentry->d_lock);
3224 di = ceph_dentry(dentry);
3225 switch (h->action) {
3226 case CEPH_MDS_LEASE_REVOKE:
3227 if (di->lease_session == session) {
3228 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3229 h->seq = cpu_to_le32(di->lease_seq);
3230 __ceph_mdsc_drop_dentry_lease(dentry);
3235 case CEPH_MDS_LEASE_RENEW:
3236 if (di->lease_session == session &&
3237 di->lease_gen == session->s_cap_gen &&
3238 di->lease_renew_from &&
3239 di->lease_renew_after == 0) {
3240 unsigned long duration =
3241 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3243 di->lease_seq = seq;
3244 di->time = di->lease_renew_from + duration;
3245 di->lease_renew_after = di->lease_renew_from +
3247 di->lease_renew_from = 0;
3251 spin_unlock(&dentry->d_lock);
3258 /* let's just reuse the same message */
3259 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3261 ceph_con_send(&session->s_con, msg);
3265 mutex_unlock(&session->s_mutex);
3269 pr_err("corrupt lease message\n");
3273 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3274 struct inode *inode,
3275 struct dentry *dentry, char action,
3278 struct ceph_msg *msg;
3279 struct ceph_mds_lease *lease;
3280 int len = sizeof(*lease) + sizeof(u32);
3283 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3284 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3285 dnamelen = dentry->d_name.len;
3288 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3291 lease = msg->front.iov_base;
3292 lease->action = action;
3293 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3294 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3295 lease->seq = cpu_to_le32(seq);
3296 put_unaligned_le32(dnamelen, lease + 1);
3297 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3300 * if this is a preemptive lease RELEASE, no need to
3301 * flush request stream, since the actual request will
3304 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3306 ceph_con_send(&session->s_con, msg);
3310 * drop all leases (and dentry refs) in preparation for umount
3312 static void drop_leases(struct ceph_mds_client *mdsc)
3316 dout("drop_leases\n");
3317 mutex_lock(&mdsc->mutex);
3318 for (i = 0; i < mdsc->max_sessions; i++) {
3319 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3322 mutex_unlock(&mdsc->mutex);
3323 mutex_lock(&s->s_mutex);
3324 mutex_unlock(&s->s_mutex);
3325 ceph_put_mds_session(s);
3326 mutex_lock(&mdsc->mutex);
3328 mutex_unlock(&mdsc->mutex);
3334 * delayed work -- periodically trim expired leases, renew caps with mds
3336 static void schedule_delayed(struct ceph_mds_client *mdsc)
3339 unsigned hz = round_jiffies_relative(HZ * delay);
3340 schedule_delayed_work(&mdsc->delayed_work, hz);
3343 static void delayed_work(struct work_struct *work)
3346 struct ceph_mds_client *mdsc =
3347 container_of(work, struct ceph_mds_client, delayed_work.work);
3351 dout("mdsc delayed_work\n");
3352 ceph_check_delayed_caps(mdsc);
3354 mutex_lock(&mdsc->mutex);
3355 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3356 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3357 mdsc->last_renew_caps);
3359 mdsc->last_renew_caps = jiffies;
3361 for (i = 0; i < mdsc->max_sessions; i++) {
3362 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3365 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3366 dout("resending session close request for mds%d\n",
3368 request_close_session(mdsc, s);
3369 ceph_put_mds_session(s);
3372 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3373 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3374 s->s_state = CEPH_MDS_SESSION_HUNG;
3375 pr_info("mds%d hung\n", s->s_mds);
3378 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3379 /* this mds is failed or recovering, just wait */
3380 ceph_put_mds_session(s);
3383 mutex_unlock(&mdsc->mutex);
3385 mutex_lock(&s->s_mutex);
3387 send_renew_caps(mdsc, s);
3389 ceph_con_keepalive(&s->s_con);
3390 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3391 s->s_state == CEPH_MDS_SESSION_HUNG)
3392 ceph_send_cap_releases(mdsc, s);
3393 mutex_unlock(&s->s_mutex);
3394 ceph_put_mds_session(s);
3396 mutex_lock(&mdsc->mutex);
3398 mutex_unlock(&mdsc->mutex);
3400 schedule_delayed(mdsc);
3403 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3406 struct ceph_mds_client *mdsc;
3408 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3413 mutex_init(&mdsc->mutex);
3414 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3415 if (mdsc->mdsmap == NULL) {
3420 init_completion(&mdsc->safe_umount_waiters);
3421 init_waitqueue_head(&mdsc->session_close_wq);
3422 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3423 mdsc->sessions = NULL;
3424 atomic_set(&mdsc->num_sessions, 0);
3425 mdsc->max_sessions = 0;
3427 mdsc->last_snap_seq = 0;
3428 init_rwsem(&mdsc->snap_rwsem);
3429 mdsc->snap_realms = RB_ROOT;
3430 INIT_LIST_HEAD(&mdsc->snap_empty);
3431 spin_lock_init(&mdsc->snap_empty_lock);
3433 mdsc->oldest_tid = 0;
3434 mdsc->request_tree = RB_ROOT;
3435 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3436 mdsc->last_renew_caps = jiffies;
3437 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3438 spin_lock_init(&mdsc->cap_delay_lock);
3439 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3440 spin_lock_init(&mdsc->snap_flush_lock);
3441 mdsc->last_cap_flush_tid = 1;
3442 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3443 INIT_LIST_HEAD(&mdsc->cap_dirty);
3444 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3445 mdsc->num_cap_flushing = 0;
3446 spin_lock_init(&mdsc->cap_dirty_lock);
3447 init_waitqueue_head(&mdsc->cap_flushing_wq);
3448 spin_lock_init(&mdsc->dentry_lru_lock);
3449 INIT_LIST_HEAD(&mdsc->dentry_lru);
3451 ceph_caps_init(mdsc);
3452 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3454 init_rwsem(&mdsc->pool_perm_rwsem);
3455 mdsc->pool_perm_tree = RB_ROOT;
3461 * Wait for safe replies on open mds requests. If we time out, drop
3462 * all requests from the tree to avoid dangling dentry refs.
3464 static void wait_requests(struct ceph_mds_client *mdsc)
3466 struct ceph_options *opts = mdsc->fsc->client->options;
3467 struct ceph_mds_request *req;
3469 mutex_lock(&mdsc->mutex);
3470 if (__get_oldest_req(mdsc)) {
3471 mutex_unlock(&mdsc->mutex);
3473 dout("wait_requests waiting for requests\n");
3474 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3475 ceph_timeout_jiffies(opts->mount_timeout));
3477 /* tear down remaining requests */
3478 mutex_lock(&mdsc->mutex);
3479 while ((req = __get_oldest_req(mdsc))) {
3480 dout("wait_requests timed out on tid %llu\n",
3482 __unregister_request(mdsc, req);
3485 mutex_unlock(&mdsc->mutex);
3486 dout("wait_requests done\n");
3490 * called before mount is ro, and before dentries are torn down.
3491 * (hmm, does this still race with new lookups?)
3493 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3495 dout("pre_umount\n");
3499 ceph_flush_dirty_caps(mdsc);
3500 wait_requests(mdsc);
3503 * wait for reply handlers to drop their request refs and
3504 * their inode/dcache refs
3510 * wait for all write mds requests to flush.
3512 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3514 struct ceph_mds_request *req = NULL, *nextreq;
3517 mutex_lock(&mdsc->mutex);
3518 dout("wait_unsafe_requests want %lld\n", want_tid);
3520 req = __get_oldest_req(mdsc);
3521 while (req && req->r_tid <= want_tid) {
3522 /* find next request */
3523 n = rb_next(&req->r_node);
3525 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3528 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3529 (req->r_op & CEPH_MDS_OP_WRITE)) {
3531 ceph_mdsc_get_request(req);
3533 ceph_mdsc_get_request(nextreq);
3534 mutex_unlock(&mdsc->mutex);
3535 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3536 req->r_tid, want_tid);
3537 wait_for_completion(&req->r_safe_completion);
3538 mutex_lock(&mdsc->mutex);
3539 ceph_mdsc_put_request(req);
3541 break; /* next dne before, so we're done! */
3542 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3543 /* next request was removed from tree */
3544 ceph_mdsc_put_request(nextreq);
3547 ceph_mdsc_put_request(nextreq); /* won't go away */
3551 mutex_unlock(&mdsc->mutex);
3552 dout("wait_unsafe_requests done\n");
3555 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3557 u64 want_tid, want_flush;
3559 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3563 mutex_lock(&mdsc->mutex);
3564 want_tid = mdsc->last_tid;
3565 mutex_unlock(&mdsc->mutex);
3567 ceph_flush_dirty_caps(mdsc);
3568 spin_lock(&mdsc->cap_dirty_lock);
3569 want_flush = mdsc->last_cap_flush_tid;
3570 if (!list_empty(&mdsc->cap_flush_list)) {
3571 struct ceph_cap_flush *cf =
3572 list_last_entry(&mdsc->cap_flush_list,
3573 struct ceph_cap_flush, g_list);
3576 spin_unlock(&mdsc->cap_dirty_lock);
3578 dout("sync want tid %lld flush_seq %lld\n",
3579 want_tid, want_flush);
3581 wait_unsafe_requests(mdsc, want_tid);
3582 wait_caps_flush(mdsc, want_flush);
3586 * true if all sessions are closed, or we force unmount
3588 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3590 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3592 return atomic_read(&mdsc->num_sessions) <= skipped;
3596 * called after sb is ro.
3598 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3600 struct ceph_options *opts = mdsc->fsc->client->options;
3601 struct ceph_mds_session *session;
3605 dout("close_sessions\n");
3607 /* close sessions */
3608 mutex_lock(&mdsc->mutex);
3609 for (i = 0; i < mdsc->max_sessions; i++) {
3610 session = __ceph_lookup_mds_session(mdsc, i);
3613 mutex_unlock(&mdsc->mutex);
3614 mutex_lock(&session->s_mutex);
3615 if (__close_session(mdsc, session) <= 0)
3617 mutex_unlock(&session->s_mutex);
3618 ceph_put_mds_session(session);
3619 mutex_lock(&mdsc->mutex);
3621 mutex_unlock(&mdsc->mutex);
3623 dout("waiting for sessions to close\n");
3624 wait_event_timeout(mdsc->session_close_wq,
3625 done_closing_sessions(mdsc, skipped),
3626 ceph_timeout_jiffies(opts->mount_timeout));
3628 /* tear down remaining sessions */
3629 mutex_lock(&mdsc->mutex);
3630 for (i = 0; i < mdsc->max_sessions; i++) {
3631 if (mdsc->sessions[i]) {
3632 session = get_session(mdsc->sessions[i]);
3633 __unregister_session(mdsc, session);
3634 mutex_unlock(&mdsc->mutex);
3635 mutex_lock(&session->s_mutex);
3636 remove_session_caps(session);
3637 mutex_unlock(&session->s_mutex);
3638 ceph_put_mds_session(session);
3639 mutex_lock(&mdsc->mutex);
3642 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3643 mutex_unlock(&mdsc->mutex);
3645 ceph_cleanup_empty_realms(mdsc);
3647 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3652 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3654 struct ceph_mds_session *session;
3657 dout("force umount\n");
3659 mutex_lock(&mdsc->mutex);
3660 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3661 session = __ceph_lookup_mds_session(mdsc, mds);
3664 mutex_unlock(&mdsc->mutex);
3665 mutex_lock(&session->s_mutex);
3666 __close_session(mdsc, session);
3667 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3668 cleanup_session_requests(mdsc, session);
3669 remove_session_caps(session);
3671 mutex_unlock(&session->s_mutex);
3672 ceph_put_mds_session(session);
3673 mutex_lock(&mdsc->mutex);
3674 kick_requests(mdsc, mds);
3676 __wake_requests(mdsc, &mdsc->waiting_for_map);
3677 mutex_unlock(&mdsc->mutex);
3680 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3683 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3685 ceph_mdsmap_destroy(mdsc->mdsmap);
3686 kfree(mdsc->sessions);
3687 ceph_caps_finalize(mdsc);
3688 ceph_pool_perm_destroy(mdsc);
3691 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3693 struct ceph_mds_client *mdsc = fsc->mdsc;
3695 dout("mdsc_destroy %p\n", mdsc);
3696 ceph_mdsc_stop(mdsc);
3698 /* flush out any connection work with references to us */
3703 dout("mdsc_destroy %p done\n", mdsc);
3706 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3708 struct ceph_fs_client *fsc = mdsc->fsc;
3709 const char *mds_namespace = fsc->mount_options->mds_namespace;
3710 void *p = msg->front.iov_base;
3711 void *end = p + msg->front.iov_len;
3715 u32 mount_fscid = (u32)-1;
3716 u8 struct_v, struct_cv;
3719 ceph_decode_need(&p, end, sizeof(u32), bad);
3720 epoch = ceph_decode_32(&p);
3722 dout("handle_fsmap epoch %u\n", epoch);
3724 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3725 struct_v = ceph_decode_8(&p);
3726 struct_cv = ceph_decode_8(&p);
3727 map_len = ceph_decode_32(&p);
3729 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3730 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3732 num_fs = ceph_decode_32(&p);
3733 while (num_fs-- > 0) {
3734 void *info_p, *info_end;
3739 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3740 info_v = ceph_decode_8(&p);
3741 info_cv = ceph_decode_8(&p);
3742 info_len = ceph_decode_32(&p);
3743 ceph_decode_need(&p, end, info_len, bad);
3745 info_end = p + info_len;
3748 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3749 fscid = ceph_decode_32(&info_p);
3750 namelen = ceph_decode_32(&info_p);
3751 ceph_decode_need(&info_p, info_end, namelen, bad);
3753 if (mds_namespace &&
3754 strlen(mds_namespace) == namelen &&
3755 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3756 mount_fscid = fscid;
3761 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3762 if (mount_fscid != (u32)-1) {
3763 fsc->client->monc.fs_cluster_id = mount_fscid;
3764 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3766 ceph_monc_renew_subs(&fsc->client->monc);
3773 pr_err("error decoding fsmap\n");
3775 mutex_lock(&mdsc->mutex);
3776 mdsc->mdsmap_err = -ENOENT;
3777 __wake_requests(mdsc, &mdsc->waiting_for_map);
3778 mutex_unlock(&mdsc->mutex);
3783 * handle mds map update.
3785 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3789 void *p = msg->front.iov_base;
3790 void *end = p + msg->front.iov_len;
3791 struct ceph_mdsmap *newmap, *oldmap;
3792 struct ceph_fsid fsid;
3795 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3796 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3797 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3799 epoch = ceph_decode_32(&p);
3800 maplen = ceph_decode_32(&p);
3801 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3803 /* do we need it? */
3804 mutex_lock(&mdsc->mutex);
3805 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3806 dout("handle_map epoch %u <= our %u\n",
3807 epoch, mdsc->mdsmap->m_epoch);
3808 mutex_unlock(&mdsc->mutex);
3812 newmap = ceph_mdsmap_decode(&p, end);
3813 if (IS_ERR(newmap)) {
3814 err = PTR_ERR(newmap);
3818 /* swap into place */
3820 oldmap = mdsc->mdsmap;
3821 mdsc->mdsmap = newmap;
3822 check_new_map(mdsc, newmap, oldmap);
3823 ceph_mdsmap_destroy(oldmap);
3825 mdsc->mdsmap = newmap; /* first mds map */
3827 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3829 __wake_requests(mdsc, &mdsc->waiting_for_map);
3830 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3831 mdsc->mdsmap->m_epoch);
3833 mutex_unlock(&mdsc->mutex);
3834 schedule_delayed(mdsc);
3838 mutex_unlock(&mdsc->mutex);
3840 pr_err("error decoding mdsmap %d\n", err);
3844 static struct ceph_connection *con_get(struct ceph_connection *con)
3846 struct ceph_mds_session *s = con->private;
3848 if (get_session(s)) {
3849 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3852 dout("mdsc con_get %p FAIL\n", s);
3856 static void con_put(struct ceph_connection *con)
3858 struct ceph_mds_session *s = con->private;
3860 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3861 ceph_put_mds_session(s);
3865 * if the client is unresponsive for long enough, the mds will kill
3866 * the session entirely.
3868 static void peer_reset(struct ceph_connection *con)
3870 struct ceph_mds_session *s = con->private;
3871 struct ceph_mds_client *mdsc = s->s_mdsc;
3873 pr_warn("mds%d closed our session\n", s->s_mds);
3874 send_mds_reconnect(mdsc, s);
3877 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3879 struct ceph_mds_session *s = con->private;
3880 struct ceph_mds_client *mdsc = s->s_mdsc;
3881 int type = le16_to_cpu(msg->hdr.type);
3883 mutex_lock(&mdsc->mutex);
3884 if (__verify_registered_session(mdsc, s) < 0) {
3885 mutex_unlock(&mdsc->mutex);
3888 mutex_unlock(&mdsc->mutex);
3891 case CEPH_MSG_MDS_MAP:
3892 ceph_mdsc_handle_mdsmap(mdsc, msg);
3894 case CEPH_MSG_FS_MAP_USER:
3895 ceph_mdsc_handle_fsmap(mdsc, msg);
3897 case CEPH_MSG_CLIENT_SESSION:
3898 handle_session(s, msg);
3900 case CEPH_MSG_CLIENT_REPLY:
3901 handle_reply(s, msg);
3903 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3904 handle_forward(mdsc, s, msg);
3906 case CEPH_MSG_CLIENT_CAPS:
3907 ceph_handle_caps(s, msg);
3909 case CEPH_MSG_CLIENT_SNAP:
3910 ceph_handle_snap(mdsc, s, msg);
3912 case CEPH_MSG_CLIENT_LEASE:
3913 handle_lease(mdsc, s, msg);
3917 pr_err("received unknown message type %d %s\n", type,
3918 ceph_msg_type_name(type));
3929 * Note: returned pointer is the address of a structure that's
3930 * managed separately. Caller must *not* attempt to free it.
3932 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3933 int *proto, int force_new)
3935 struct ceph_mds_session *s = con->private;
3936 struct ceph_mds_client *mdsc = s->s_mdsc;
3937 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3938 struct ceph_auth_handshake *auth = &s->s_auth;
3940 if (force_new && auth->authorizer) {
3941 ceph_auth_destroy_authorizer(auth->authorizer);
3942 auth->authorizer = NULL;
3944 if (!auth->authorizer) {
3945 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3948 return ERR_PTR(ret);
3950 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3953 return ERR_PTR(ret);
3955 *proto = ac->protocol;
3961 static int verify_authorizer_reply(struct ceph_connection *con)
3963 struct ceph_mds_session *s = con->private;
3964 struct ceph_mds_client *mdsc = s->s_mdsc;
3965 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3967 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
3970 static int invalidate_authorizer(struct ceph_connection *con)
3972 struct ceph_mds_session *s = con->private;
3973 struct ceph_mds_client *mdsc = s->s_mdsc;
3974 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3976 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3978 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3981 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3982 struct ceph_msg_header *hdr, int *skip)
3984 struct ceph_msg *msg;
3985 int type = (int) le16_to_cpu(hdr->type);
3986 int front_len = (int) le32_to_cpu(hdr->front_len);
3992 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3994 pr_err("unable to allocate msg type %d len %d\n",
4002 static int mds_sign_message(struct ceph_msg *msg)
4004 struct ceph_mds_session *s = msg->con->private;
4005 struct ceph_auth_handshake *auth = &s->s_auth;
4007 return ceph_auth_sign_message(auth, msg);
4010 static int mds_check_message_signature(struct ceph_msg *msg)
4012 struct ceph_mds_session *s = msg->con->private;
4013 struct ceph_auth_handshake *auth = &s->s_auth;
4015 return ceph_auth_check_message_signature(auth, msg);
4018 static const struct ceph_connection_operations mds_con_ops = {
4021 .dispatch = dispatch,
4022 .get_authorizer = get_authorizer,
4023 .verify_authorizer_reply = verify_authorizer_reply,
4024 .invalidate_authorizer = invalidate_authorizer,
4025 .peer_reset = peer_reset,
4026 .alloc_msg = mds_alloc_msg,
4027 .sign_message = mds_sign_message,
4028 .check_message_signature = mds_check_message_signature,