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/ratelimit.h>
13 #include "mds_client.h"
15 #include <linux/ceph/ceph_features.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/decode.h>
18 #include <linux/ceph/pagelist.h>
19 #include <linux/ceph/auth.h>
20 #include <linux/ceph/debugfs.h>
23 * A cluster of MDS (metadata server) daemons is responsible for
24 * managing the file system namespace (the directory hierarchy and
25 * inodes) and for coordinating shared access to storage. Metadata is
26 * partitioning hierarchically across a number of servers, and that
27 * partition varies over time as the cluster adjusts the distribution
28 * in order to balance load.
30 * The MDS client is primarily responsible to managing synchronous
31 * metadata requests for operations like open, unlink, and so forth.
32 * If there is a MDS failure, we find out about it when we (possibly
33 * request and) receive a new MDS map, and can resubmit affected
36 * For the most part, though, we take advantage of a lossless
37 * communications channel to the MDS, and do not need to worry about
38 * timing out or resubmitting requests.
40 * We maintain a stateful "session" with each MDS we interact with.
41 * Within each session, we sent periodic heartbeat messages to ensure
42 * any capabilities or leases we have been issues remain valid. If
43 * the session times out and goes stale, our leases and capabilities
44 * are no longer valid.
47 struct ceph_reconnect_state {
49 struct ceph_pagelist *pagelist;
53 static void __wake_requests(struct ceph_mds_client *mdsc,
54 struct list_head *head);
56 static const struct ceph_connection_operations mds_con_ops;
64 * parse individual inode info
66 static int parse_reply_info_in(void **p, void *end,
67 struct ceph_mds_reply_info_in *info,
73 *p += sizeof(struct ceph_mds_reply_inode) +
74 sizeof(*info->in->fragtree.splits) *
75 le32_to_cpu(info->in->fragtree.nsplits);
77 ceph_decode_32_safe(p, end, info->symlink_len, bad);
78 ceph_decode_need(p, end, info->symlink_len, bad);
80 *p += info->symlink_len;
82 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
83 ceph_decode_copy_safe(p, end, &info->dir_layout,
84 sizeof(info->dir_layout), bad);
86 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
88 ceph_decode_32_safe(p, end, info->xattr_len, bad);
89 ceph_decode_need(p, end, info->xattr_len, bad);
90 info->xattr_data = *p;
91 *p += info->xattr_len;
93 if (features & CEPH_FEATURE_MDS_INLINE_DATA) {
94 ceph_decode_64_safe(p, end, info->inline_version, bad);
95 ceph_decode_32_safe(p, end, info->inline_len, bad);
96 ceph_decode_need(p, end, info->inline_len, bad);
97 info->inline_data = *p;
98 *p += info->inline_len;
100 info->inline_version = CEPH_INLINE_NONE;
102 info->pool_ns_len = 0;
103 info->pool_ns_data = NULL;
104 if (features & CEPH_FEATURE_FS_FILE_LAYOUT_V2) {
105 ceph_decode_32_safe(p, end, info->pool_ns_len, bad);
106 if (info->pool_ns_len > 0) {
107 ceph_decode_need(p, end, info->pool_ns_len, bad);
108 info->pool_ns_data = *p;
109 *p += info->pool_ns_len;
119 * parse a normal reply, which may contain a (dir+)dentry and/or a
122 static int parse_reply_info_trace(void **p, void *end,
123 struct ceph_mds_reply_info_parsed *info,
128 if (info->head->is_dentry) {
129 err = parse_reply_info_in(p, end, &info->diri, features);
133 if (unlikely(*p + sizeof(*info->dirfrag) > end))
136 *p += sizeof(*info->dirfrag) +
137 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
138 if (unlikely(*p > end))
141 ceph_decode_32_safe(p, end, info->dname_len, bad);
142 ceph_decode_need(p, end, info->dname_len, bad);
144 *p += info->dname_len;
146 *p += sizeof(*info->dlease);
149 if (info->head->is_target) {
150 err = parse_reply_info_in(p, end, &info->targeti, features);
155 if (unlikely(*p != end))
162 pr_err("problem parsing mds trace %d\n", err);
167 * parse readdir results
169 static int parse_reply_info_dir(void **p, void *end,
170 struct ceph_mds_reply_info_parsed *info,
177 if (*p + sizeof(*info->dir_dir) > end)
179 *p += sizeof(*info->dir_dir) +
180 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
184 ceph_decode_need(p, end, sizeof(num) + 2, bad);
185 num = ceph_decode_32(p);
187 u16 flags = ceph_decode_16(p);
188 info->dir_end = !!(flags & CEPH_READDIR_FRAG_END);
189 info->dir_complete = !!(flags & CEPH_READDIR_FRAG_COMPLETE);
190 info->hash_order = !!(flags & CEPH_READDIR_HASH_ORDER);
191 info->offset_hash = !!(flags & CEPH_READDIR_OFFSET_HASH);
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 (refcount_inc_not_zero(&s->s_ref)) {
382 dout("mdsc get_session %p %d -> %d\n", s,
383 refcount_read(&s->s_ref)-1, refcount_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 refcount_read(&s->s_ref), refcount_read(&s->s_ref)-1);
395 if (refcount_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])
412 session = mdsc->sessions[mds];
413 dout("lookup_mds_session %p %d\n", session,
414 refcount_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_num_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 refcount_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 refcount_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);
551 ceph_put_cap_refs(ceph_inode(req->r_parent), 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 /* Never leave an unregistered request on an unsafe list! */
632 list_del_init(&req->r_unsafe_item);
634 if (req->r_tid == mdsc->oldest_tid) {
635 struct rb_node *p = rb_next(&req->r_node);
636 mdsc->oldest_tid = 0;
638 struct ceph_mds_request *next_req =
639 rb_entry(p, struct ceph_mds_request, r_node);
640 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
641 mdsc->oldest_tid = next_req->r_tid;
648 erase_request(&mdsc->request_tree, req);
650 if (req->r_unsafe_dir &&
651 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
652 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
653 spin_lock(&ci->i_unsafe_lock);
654 list_del_init(&req->r_unsafe_dir_item);
655 spin_unlock(&ci->i_unsafe_lock);
657 if (req->r_target_inode &&
658 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
659 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
660 spin_lock(&ci->i_unsafe_lock);
661 list_del_init(&req->r_unsafe_target_item);
662 spin_unlock(&ci->i_unsafe_lock);
665 if (req->r_unsafe_dir) {
666 iput(req->r_unsafe_dir);
667 req->r_unsafe_dir = NULL;
670 complete_all(&req->r_safe_completion);
672 ceph_mdsc_put_request(req);
676 * Walk back up the dentry tree until we hit a dentry representing a
677 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
678 * when calling this) to ensure that the objects won't disappear while we're
679 * working with them. Once we hit a candidate dentry, we attempt to take a
680 * reference to it, and return that as the result.
682 static struct inode *get_nonsnap_parent(struct dentry *dentry)
684 struct inode *inode = NULL;
686 while (dentry && !IS_ROOT(dentry)) {
687 inode = d_inode_rcu(dentry);
688 if (!inode || ceph_snap(inode) == CEPH_NOSNAP)
690 dentry = dentry->d_parent;
693 inode = igrab(inode);
698 * Choose mds to send request to next. If there is a hint set in the
699 * request (e.g., due to a prior forward hint from the mds), use that.
700 * Otherwise, consult frag tree and/or caps to identify the
701 * appropriate mds. If all else fails, choose randomly.
703 * Called under mdsc->mutex.
705 static int __choose_mds(struct ceph_mds_client *mdsc,
706 struct ceph_mds_request *req)
709 struct ceph_inode_info *ci;
710 struct ceph_cap *cap;
711 int mode = req->r_direct_mode;
713 u32 hash = req->r_direct_hash;
714 bool is_hash = test_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags);
717 * is there a specific mds we should try? ignore hint if we have
718 * no session and the mds is not up (active or recovering).
720 if (req->r_resend_mds >= 0 &&
721 (__have_session(mdsc, req->r_resend_mds) ||
722 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
723 dout("choose_mds using resend_mds mds%d\n",
725 return req->r_resend_mds;
728 if (mode == USE_RANDOM_MDS)
733 if (ceph_snap(req->r_inode) != CEPH_SNAPDIR) {
734 inode = req->r_inode;
737 /* req->r_dentry is non-null for LSSNAP request */
739 inode = get_nonsnap_parent(req->r_dentry);
741 dout("__choose_mds using snapdir's parent %p\n", inode);
743 } else if (req->r_dentry) {
744 /* ignore race with rename; old or new d_parent is okay */
745 struct dentry *parent;
749 parent = req->r_dentry->d_parent;
750 dir = req->r_parent ? : d_inode_rcu(parent);
752 if (!dir || dir->i_sb != mdsc->fsc->sb) {
753 /* not this fs or parent went negative */
754 inode = d_inode(req->r_dentry);
757 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
758 /* direct snapped/virtual snapdir requests
759 * based on parent dir inode */
760 inode = get_nonsnap_parent(parent);
761 dout("__choose_mds using nonsnap parent %p\n", inode);
764 inode = d_inode(req->r_dentry);
765 if (!inode || mode == USE_AUTH_MDS) {
768 hash = ceph_dentry_hash(dir, req->r_dentry);
777 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
781 ci = ceph_inode(inode);
783 if (is_hash && S_ISDIR(inode->i_mode)) {
784 struct ceph_inode_frag frag;
787 ceph_choose_frag(ci, hash, &frag, &found);
789 if (mode == USE_ANY_MDS && frag.ndist > 0) {
792 /* choose a random replica */
793 get_random_bytes(&r, 1);
796 dout("choose_mds %p %llx.%llx "
797 "frag %u mds%d (%d/%d)\n",
798 inode, ceph_vinop(inode),
801 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
802 CEPH_MDS_STATE_ACTIVE)
806 /* since this file/dir wasn't known to be
807 * replicated, then we want to look for the
808 * authoritative mds. */
811 /* choose auth mds */
813 dout("choose_mds %p %llx.%llx "
814 "frag %u mds%d (auth)\n",
815 inode, ceph_vinop(inode), frag.frag, mds);
816 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
817 CEPH_MDS_STATE_ACTIVE)
823 spin_lock(&ci->i_ceph_lock);
825 if (mode == USE_AUTH_MDS)
826 cap = ci->i_auth_cap;
827 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
828 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
830 spin_unlock(&ci->i_ceph_lock);
834 mds = cap->session->s_mds;
835 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
836 inode, ceph_vinop(inode), mds,
837 cap == ci->i_auth_cap ? "auth " : "", cap);
838 spin_unlock(&ci->i_ceph_lock);
844 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
845 dout("choose_mds chose random mds%d\n", mds);
853 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
855 struct ceph_msg *msg;
856 struct ceph_mds_session_head *h;
858 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
861 pr_err("create_session_msg ENOMEM creating msg\n");
864 h = msg->front.iov_base;
865 h->op = cpu_to_le32(op);
866 h->seq = cpu_to_le64(seq);
872 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
873 * to include additional client metadata fields.
875 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
877 struct ceph_msg *msg;
878 struct ceph_mds_session_head *h;
880 int metadata_bytes = 0;
881 int metadata_key_count = 0;
882 struct ceph_options *opt = mdsc->fsc->client->options;
883 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
886 const char* metadata[][2] = {
887 {"hostname", mdsc->nodename},
888 {"kernel_version", init_utsname()->release},
889 {"entity_id", opt->name ? : ""},
890 {"root", fsopt->server_path ? : "/"},
894 /* Calculate serialized length of metadata */
895 metadata_bytes = 4; /* map length */
896 for (i = 0; metadata[i][0]; ++i) {
897 metadata_bytes += 8 + strlen(metadata[i][0]) +
898 strlen(metadata[i][1]);
899 metadata_key_count++;
902 /* Allocate the message */
903 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
906 pr_err("create_session_msg ENOMEM creating msg\n");
909 h = msg->front.iov_base;
910 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
911 h->seq = cpu_to_le64(seq);
914 * Serialize client metadata into waiting buffer space, using
915 * the format that userspace expects for map<string, string>
917 * ClientSession messages with metadata are v2
919 msg->hdr.version = cpu_to_le16(2);
920 msg->hdr.compat_version = cpu_to_le16(1);
922 /* The write pointer, following the session_head structure */
923 p = msg->front.iov_base + sizeof(*h);
925 /* Number of entries in the map */
926 ceph_encode_32(&p, metadata_key_count);
928 /* Two length-prefixed strings for each entry in the map */
929 for (i = 0; metadata[i][0]; ++i) {
930 size_t const key_len = strlen(metadata[i][0]);
931 size_t const val_len = strlen(metadata[i][1]);
933 ceph_encode_32(&p, key_len);
934 memcpy(p, metadata[i][0], key_len);
936 ceph_encode_32(&p, val_len);
937 memcpy(p, metadata[i][1], val_len);
945 * send session open request.
947 * called under mdsc->mutex
949 static int __open_session(struct ceph_mds_client *mdsc,
950 struct ceph_mds_session *session)
952 struct ceph_msg *msg;
954 int mds = session->s_mds;
956 /* wait for mds to go active? */
957 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
958 dout("open_session to mds%d (%s)\n", mds,
959 ceph_mds_state_name(mstate));
960 session->s_state = CEPH_MDS_SESSION_OPENING;
961 session->s_renew_requested = jiffies;
963 /* send connect message */
964 msg = create_session_open_msg(mdsc, session->s_seq);
967 ceph_con_send(&session->s_con, msg);
972 * open sessions for any export targets for the given mds
974 * called under mdsc->mutex
976 static struct ceph_mds_session *
977 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
979 struct ceph_mds_session *session;
981 session = __ceph_lookup_mds_session(mdsc, target);
983 session = register_session(mdsc, target);
987 if (session->s_state == CEPH_MDS_SESSION_NEW ||
988 session->s_state == CEPH_MDS_SESSION_CLOSING)
989 __open_session(mdsc, session);
994 struct ceph_mds_session *
995 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
997 struct ceph_mds_session *session;
999 dout("open_export_target_session to mds%d\n", target);
1001 mutex_lock(&mdsc->mutex);
1002 session = __open_export_target_session(mdsc, target);
1003 mutex_unlock(&mdsc->mutex);
1008 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
1009 struct ceph_mds_session *session)
1011 struct ceph_mds_info *mi;
1012 struct ceph_mds_session *ts;
1013 int i, mds = session->s_mds;
1015 if (mds >= mdsc->mdsmap->m_num_mds)
1018 mi = &mdsc->mdsmap->m_info[mds];
1019 dout("open_export_target_sessions for mds%d (%d targets)\n",
1020 session->s_mds, mi->num_export_targets);
1022 for (i = 0; i < mi->num_export_targets; i++) {
1023 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
1025 ceph_put_mds_session(ts);
1029 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
1030 struct ceph_mds_session *session)
1032 mutex_lock(&mdsc->mutex);
1033 __open_export_target_sessions(mdsc, session);
1034 mutex_unlock(&mdsc->mutex);
1041 /* caller holds s_cap_lock, we drop it */
1042 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1043 struct ceph_mds_session *session)
1044 __releases(session->s_cap_lock)
1046 LIST_HEAD(tmp_list);
1047 list_splice_init(&session->s_cap_releases, &tmp_list);
1048 session->s_num_cap_releases = 0;
1049 spin_unlock(&session->s_cap_lock);
1051 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1052 while (!list_empty(&tmp_list)) {
1053 struct ceph_cap *cap;
1054 /* zero out the in-progress message */
1055 cap = list_first_entry(&tmp_list,
1056 struct ceph_cap, session_caps);
1057 list_del(&cap->session_caps);
1058 ceph_put_cap(mdsc, cap);
1062 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1063 struct ceph_mds_session *session)
1065 struct ceph_mds_request *req;
1068 dout("cleanup_session_requests mds%d\n", session->s_mds);
1069 mutex_lock(&mdsc->mutex);
1070 while (!list_empty(&session->s_unsafe)) {
1071 req = list_first_entry(&session->s_unsafe,
1072 struct ceph_mds_request, r_unsafe_item);
1073 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1075 __unregister_request(mdsc, req);
1077 /* zero r_attempts, so kick_requests() will re-send requests */
1078 p = rb_first(&mdsc->request_tree);
1080 req = rb_entry(p, struct ceph_mds_request, r_node);
1082 if (req->r_session &&
1083 req->r_session->s_mds == session->s_mds)
1084 req->r_attempts = 0;
1086 mutex_unlock(&mdsc->mutex);
1090 * Helper to safely iterate over all caps associated with a session, with
1091 * special care taken to handle a racing __ceph_remove_cap().
1093 * Caller must hold session s_mutex.
1095 static int iterate_session_caps(struct ceph_mds_session *session,
1096 int (*cb)(struct inode *, struct ceph_cap *,
1099 struct list_head *p;
1100 struct ceph_cap *cap;
1101 struct inode *inode, *last_inode = NULL;
1102 struct ceph_cap *old_cap = NULL;
1105 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1106 spin_lock(&session->s_cap_lock);
1107 p = session->s_caps.next;
1108 while (p != &session->s_caps) {
1109 cap = list_entry(p, struct ceph_cap, session_caps);
1110 inode = igrab(&cap->ci->vfs_inode);
1115 session->s_cap_iterator = cap;
1116 spin_unlock(&session->s_cap_lock);
1123 ceph_put_cap(session->s_mdsc, old_cap);
1127 ret = cb(inode, cap, arg);
1130 spin_lock(&session->s_cap_lock);
1133 dout("iterate_session_caps finishing cap %p removal\n",
1135 BUG_ON(cap->session != session);
1136 cap->session = NULL;
1137 list_del_init(&cap->session_caps);
1138 session->s_nr_caps--;
1139 if (cap->queue_release) {
1140 list_add_tail(&cap->session_caps,
1141 &session->s_cap_releases);
1142 session->s_num_cap_releases++;
1144 old_cap = cap; /* put_cap it w/o locks held */
1152 session->s_cap_iterator = NULL;
1153 spin_unlock(&session->s_cap_lock);
1157 ceph_put_cap(session->s_mdsc, old_cap);
1162 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1165 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1166 struct ceph_inode_info *ci = ceph_inode(inode);
1167 LIST_HEAD(to_remove);
1169 bool invalidate = false;
1171 dout("removing cap %p, ci is %p, inode is %p\n",
1172 cap, ci, &ci->vfs_inode);
1173 spin_lock(&ci->i_ceph_lock);
1174 __ceph_remove_cap(cap, false);
1175 if (!ci->i_auth_cap) {
1176 struct ceph_cap_flush *cf;
1177 struct ceph_mds_client *mdsc = fsc->mdsc;
1179 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1181 if (ci->i_wrbuffer_ref > 0 &&
1182 READ_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1185 while (!list_empty(&ci->i_cap_flush_list)) {
1186 cf = list_first_entry(&ci->i_cap_flush_list,
1187 struct ceph_cap_flush, i_list);
1188 list_move(&cf->i_list, &to_remove);
1191 spin_lock(&mdsc->cap_dirty_lock);
1193 list_for_each_entry(cf, &to_remove, i_list)
1194 list_del(&cf->g_list);
1196 if (!list_empty(&ci->i_dirty_item)) {
1197 pr_warn_ratelimited(
1198 " dropping dirty %s state for %p %lld\n",
1199 ceph_cap_string(ci->i_dirty_caps),
1200 inode, ceph_ino(inode));
1201 ci->i_dirty_caps = 0;
1202 list_del_init(&ci->i_dirty_item);
1205 if (!list_empty(&ci->i_flushing_item)) {
1206 pr_warn_ratelimited(
1207 " dropping dirty+flushing %s state for %p %lld\n",
1208 ceph_cap_string(ci->i_flushing_caps),
1209 inode, ceph_ino(inode));
1210 ci->i_flushing_caps = 0;
1211 list_del_init(&ci->i_flushing_item);
1212 mdsc->num_cap_flushing--;
1215 spin_unlock(&mdsc->cap_dirty_lock);
1217 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1218 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1219 ci->i_prealloc_cap_flush = NULL;
1222 spin_unlock(&ci->i_ceph_lock);
1223 while (!list_empty(&to_remove)) {
1224 struct ceph_cap_flush *cf;
1225 cf = list_first_entry(&to_remove,
1226 struct ceph_cap_flush, i_list);
1227 list_del(&cf->i_list);
1228 ceph_free_cap_flush(cf);
1231 wake_up_all(&ci->i_cap_wq);
1233 ceph_queue_invalidate(inode);
1240 * caller must hold session s_mutex
1242 static void remove_session_caps(struct ceph_mds_session *session)
1244 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1245 struct super_block *sb = fsc->sb;
1246 dout("remove_session_caps on %p\n", session);
1247 iterate_session_caps(session, remove_session_caps_cb, fsc);
1249 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1251 spin_lock(&session->s_cap_lock);
1252 if (session->s_nr_caps > 0) {
1253 struct inode *inode;
1254 struct ceph_cap *cap, *prev = NULL;
1255 struct ceph_vino vino;
1257 * iterate_session_caps() skips inodes that are being
1258 * deleted, we need to wait until deletions are complete.
1259 * __wait_on_freeing_inode() is designed for the job,
1260 * but it is not exported, so use lookup inode function
1263 while (!list_empty(&session->s_caps)) {
1264 cap = list_entry(session->s_caps.next,
1265 struct ceph_cap, session_caps);
1269 vino = cap->ci->i_vino;
1270 spin_unlock(&session->s_cap_lock);
1272 inode = ceph_find_inode(sb, vino);
1275 spin_lock(&session->s_cap_lock);
1279 // drop cap expires and unlock s_cap_lock
1280 cleanup_cap_releases(session->s_mdsc, session);
1282 BUG_ON(session->s_nr_caps > 0);
1283 BUG_ON(!list_empty(&session->s_cap_flushing));
1287 * wake up any threads waiting on this session's caps. if the cap is
1288 * old (didn't get renewed on the client reconnect), remove it now.
1290 * caller must hold s_mutex.
1292 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1295 struct ceph_inode_info *ci = ceph_inode(inode);
1298 spin_lock(&ci->i_ceph_lock);
1299 ci->i_wanted_max_size = 0;
1300 ci->i_requested_max_size = 0;
1301 spin_unlock(&ci->i_ceph_lock);
1303 wake_up_all(&ci->i_cap_wq);
1307 static void wake_up_session_caps(struct ceph_mds_session *session,
1310 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1311 iterate_session_caps(session, wake_up_session_cb,
1312 (void *)(unsigned long)reconnect);
1316 * Send periodic message to MDS renewing all currently held caps. The
1317 * ack will reset the expiration for all caps from this session.
1319 * caller holds s_mutex
1321 static int send_renew_caps(struct ceph_mds_client *mdsc,
1322 struct ceph_mds_session *session)
1324 struct ceph_msg *msg;
1327 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1328 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1329 pr_info("mds%d caps stale\n", session->s_mds);
1330 session->s_renew_requested = jiffies;
1332 /* do not try to renew caps until a recovering mds has reconnected
1333 * with its clients. */
1334 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1335 if (state < CEPH_MDS_STATE_RECONNECT) {
1336 dout("send_renew_caps ignoring mds%d (%s)\n",
1337 session->s_mds, ceph_mds_state_name(state));
1341 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1342 ceph_mds_state_name(state));
1343 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1344 ++session->s_renew_seq);
1347 ceph_con_send(&session->s_con, msg);
1351 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1352 struct ceph_mds_session *session, u64 seq)
1354 struct ceph_msg *msg;
1356 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1357 session->s_mds, ceph_session_state_name(session->s_state), seq);
1358 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1361 ceph_con_send(&session->s_con, msg);
1367 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1369 * Called under session->s_mutex
1371 static void renewed_caps(struct ceph_mds_client *mdsc,
1372 struct ceph_mds_session *session, int is_renew)
1377 spin_lock(&session->s_cap_lock);
1378 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1380 session->s_cap_ttl = session->s_renew_requested +
1381 mdsc->mdsmap->m_session_timeout*HZ;
1384 if (time_before(jiffies, session->s_cap_ttl)) {
1385 pr_info("mds%d caps renewed\n", session->s_mds);
1388 pr_info("mds%d caps still stale\n", session->s_mds);
1391 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1392 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1393 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1394 spin_unlock(&session->s_cap_lock);
1397 wake_up_session_caps(session, 0);
1401 * send a session close request
1403 static int request_close_session(struct ceph_mds_client *mdsc,
1404 struct ceph_mds_session *session)
1406 struct ceph_msg *msg;
1408 dout("request_close_session mds%d state %s seq %lld\n",
1409 session->s_mds, ceph_session_state_name(session->s_state),
1411 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1414 ceph_con_send(&session->s_con, msg);
1419 * Called with s_mutex held.
1421 static int __close_session(struct ceph_mds_client *mdsc,
1422 struct ceph_mds_session *session)
1424 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1426 session->s_state = CEPH_MDS_SESSION_CLOSING;
1427 return request_close_session(mdsc, session);
1431 * Trim old(er) caps.
1433 * Because we can't cache an inode without one or more caps, we do
1434 * this indirectly: if a cap is unused, we prune its aliases, at which
1435 * point the inode will hopefully get dropped to.
1437 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1438 * memory pressure from the MDS, though, so it needn't be perfect.
1440 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1442 struct ceph_mds_session *session = arg;
1443 struct ceph_inode_info *ci = ceph_inode(inode);
1444 int used, wanted, oissued, mine;
1446 if (session->s_trim_caps <= 0)
1449 spin_lock(&ci->i_ceph_lock);
1450 mine = cap->issued | cap->implemented;
1451 used = __ceph_caps_used(ci);
1452 wanted = __ceph_caps_file_wanted(ci);
1453 oissued = __ceph_caps_issued_other(ci, cap);
1455 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1456 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1457 ceph_cap_string(used), ceph_cap_string(wanted));
1458 if (cap == ci->i_auth_cap) {
1459 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1460 !list_empty(&ci->i_cap_snaps))
1462 if ((used | wanted) & CEPH_CAP_ANY_WR)
1465 /* The inode has cached pages, but it's no longer used.
1466 * we can safely drop it */
1467 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1468 !(oissued & CEPH_CAP_FILE_CACHE)) {
1472 if ((used | wanted) & ~oissued & mine)
1473 goto out; /* we need these caps */
1475 session->s_trim_caps--;
1477 /* we aren't the only cap.. just remove us */
1478 __ceph_remove_cap(cap, true);
1480 /* try dropping referring dentries */
1481 spin_unlock(&ci->i_ceph_lock);
1482 d_prune_aliases(inode);
1483 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1484 inode, cap, atomic_read(&inode->i_count));
1489 spin_unlock(&ci->i_ceph_lock);
1494 * Trim session cap count down to some max number.
1496 static int trim_caps(struct ceph_mds_client *mdsc,
1497 struct ceph_mds_session *session,
1500 int trim_caps = session->s_nr_caps - max_caps;
1502 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1503 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1504 if (trim_caps > 0) {
1505 session->s_trim_caps = trim_caps;
1506 iterate_session_caps(session, trim_caps_cb, session);
1507 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1508 session->s_mds, session->s_nr_caps, max_caps,
1509 trim_caps - session->s_trim_caps);
1510 session->s_trim_caps = 0;
1513 ceph_send_cap_releases(mdsc, session);
1517 static int check_caps_flush(struct ceph_mds_client *mdsc,
1522 spin_lock(&mdsc->cap_dirty_lock);
1523 if (!list_empty(&mdsc->cap_flush_list)) {
1524 struct ceph_cap_flush *cf =
1525 list_first_entry(&mdsc->cap_flush_list,
1526 struct ceph_cap_flush, g_list);
1527 if (cf->tid <= want_flush_tid) {
1528 dout("check_caps_flush still flushing tid "
1529 "%llu <= %llu\n", cf->tid, want_flush_tid);
1533 spin_unlock(&mdsc->cap_dirty_lock);
1538 * flush all dirty inode data to disk.
1540 * returns true if we've flushed through want_flush_tid
1542 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1545 dout("check_caps_flush want %llu\n", want_flush_tid);
1547 wait_event(mdsc->cap_flushing_wq,
1548 check_caps_flush(mdsc, want_flush_tid));
1550 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1554 * called under s_mutex
1556 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1557 struct ceph_mds_session *session)
1559 struct ceph_msg *msg = NULL;
1560 struct ceph_mds_cap_release *head;
1561 struct ceph_mds_cap_item *item;
1562 struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc;
1563 struct ceph_cap *cap;
1564 LIST_HEAD(tmp_list);
1565 int num_cap_releases;
1566 __le32 barrier, *cap_barrier;
1568 down_read(&osdc->lock);
1569 barrier = cpu_to_le32(osdc->epoch_barrier);
1570 up_read(&osdc->lock);
1572 spin_lock(&session->s_cap_lock);
1574 list_splice_init(&session->s_cap_releases, &tmp_list);
1575 num_cap_releases = session->s_num_cap_releases;
1576 session->s_num_cap_releases = 0;
1577 spin_unlock(&session->s_cap_lock);
1579 while (!list_empty(&tmp_list)) {
1581 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1582 PAGE_SIZE, GFP_NOFS, false);
1585 head = msg->front.iov_base;
1586 head->num = cpu_to_le32(0);
1587 msg->front.iov_len = sizeof(*head);
1589 msg->hdr.version = cpu_to_le16(2);
1590 msg->hdr.compat_version = cpu_to_le16(1);
1593 cap = list_first_entry(&tmp_list, struct ceph_cap,
1595 list_del(&cap->session_caps);
1598 head = msg->front.iov_base;
1599 le32_add_cpu(&head->num, 1);
1600 item = msg->front.iov_base + msg->front.iov_len;
1601 item->ino = cpu_to_le64(cap->cap_ino);
1602 item->cap_id = cpu_to_le64(cap->cap_id);
1603 item->migrate_seq = cpu_to_le32(cap->mseq);
1604 item->seq = cpu_to_le32(cap->issue_seq);
1605 msg->front.iov_len += sizeof(*item);
1607 ceph_put_cap(mdsc, cap);
1609 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1610 // Append cap_barrier field
1611 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1612 *cap_barrier = barrier;
1613 msg->front.iov_len += sizeof(*cap_barrier);
1615 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1616 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1617 ceph_con_send(&session->s_con, msg);
1622 BUG_ON(num_cap_releases != 0);
1624 spin_lock(&session->s_cap_lock);
1625 if (!list_empty(&session->s_cap_releases))
1627 spin_unlock(&session->s_cap_lock);
1630 // Append cap_barrier field
1631 cap_barrier = msg->front.iov_base + msg->front.iov_len;
1632 *cap_barrier = barrier;
1633 msg->front.iov_len += sizeof(*cap_barrier);
1635 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1636 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1637 ceph_con_send(&session->s_con, msg);
1641 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1643 spin_lock(&session->s_cap_lock);
1644 list_splice(&tmp_list, &session->s_cap_releases);
1645 session->s_num_cap_releases += num_cap_releases;
1646 spin_unlock(&session->s_cap_lock);
1653 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1656 struct ceph_inode_info *ci = ceph_inode(dir);
1657 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1658 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1659 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1660 int order, num_entries;
1662 spin_lock(&ci->i_ceph_lock);
1663 num_entries = ci->i_files + ci->i_subdirs;
1664 spin_unlock(&ci->i_ceph_lock);
1665 num_entries = max(num_entries, 1);
1666 num_entries = min(num_entries, opt->max_readdir);
1668 order = get_order(size * num_entries);
1669 while (order >= 0) {
1670 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1673 if (rinfo->dir_entries)
1677 if (!rinfo->dir_entries)
1680 num_entries = (PAGE_SIZE << order) / size;
1681 num_entries = min(num_entries, opt->max_readdir);
1683 rinfo->dir_buf_size = PAGE_SIZE << order;
1684 req->r_num_caps = num_entries + 1;
1685 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1686 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1691 * Create an mds request.
1693 struct ceph_mds_request *
1694 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1696 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1699 return ERR_PTR(-ENOMEM);
1701 mutex_init(&req->r_fill_mutex);
1703 req->r_started = jiffies;
1704 req->r_resend_mds = -1;
1705 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1706 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1708 kref_init(&req->r_kref);
1709 RB_CLEAR_NODE(&req->r_node);
1710 INIT_LIST_HEAD(&req->r_wait);
1711 init_completion(&req->r_completion);
1712 init_completion(&req->r_safe_completion);
1713 INIT_LIST_HEAD(&req->r_unsafe_item);
1715 req->r_stamp = timespec_trunc(current_kernel_time(), mdsc->fsc->sb->s_time_gran);
1718 req->r_direct_mode = mode;
1723 * return oldest (lowest) request, tid in request tree, 0 if none.
1725 * called under mdsc->mutex.
1727 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1729 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1731 return rb_entry(rb_first(&mdsc->request_tree),
1732 struct ceph_mds_request, r_node);
1735 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1737 return mdsc->oldest_tid;
1741 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1742 * on build_path_from_dentry in fs/cifs/dir.c.
1744 * If @stop_on_nosnap, generate path relative to the first non-snapped
1747 * Encode hidden .snap dirs as a double /, i.e.
1748 * foo/.snap/bar -> foo//bar
1750 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1753 struct dentry *temp;
1759 return ERR_PTR(-EINVAL);
1763 seq = read_seqbegin(&rename_lock);
1765 for (temp = dentry; !IS_ROOT(temp);) {
1766 struct inode *inode = d_inode(temp);
1767 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1768 len++; /* slash only */
1769 else if (stop_on_nosnap && inode &&
1770 ceph_snap(inode) == CEPH_NOSNAP)
1773 len += 1 + temp->d_name.len;
1774 temp = temp->d_parent;
1778 len--; /* no leading '/' */
1780 path = kmalloc(len+1, GFP_NOFS);
1782 return ERR_PTR(-ENOMEM);
1784 path[pos] = 0; /* trailing null */
1786 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1787 struct inode *inode;
1789 spin_lock(&temp->d_lock);
1790 inode = d_inode(temp);
1791 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1792 dout("build_path path+%d: %p SNAPDIR\n",
1794 } else if (stop_on_nosnap && inode &&
1795 ceph_snap(inode) == CEPH_NOSNAP) {
1796 spin_unlock(&temp->d_lock);
1799 pos -= temp->d_name.len;
1801 spin_unlock(&temp->d_lock);
1804 strncpy(path + pos, temp->d_name.name,
1807 spin_unlock(&temp->d_lock);
1810 temp = temp->d_parent;
1813 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1814 pr_err("build_path did not end path lookup where "
1815 "expected, namelen is %d, pos is %d\n", len, pos);
1816 /* presumably this is only possible if racing with a
1817 rename of one of the parent directories (we can not
1818 lock the dentries above us to prevent this, but
1819 retrying should be harmless) */
1824 *base = ceph_ino(d_inode(temp));
1826 dout("build_path on %p %d built %llx '%.*s'\n",
1827 dentry, d_count(dentry), *base, len, path);
1831 static int build_dentry_path(struct dentry *dentry, struct inode *dir,
1832 const char **ppath, int *ppathlen, u64 *pino,
1839 dir = d_inode_rcu(dentry->d_parent);
1840 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1841 *pino = ceph_ino(dir);
1843 *ppath = dentry->d_name.name;
1844 *ppathlen = dentry->d_name.len;
1848 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1850 return PTR_ERR(path);
1856 static int build_inode_path(struct inode *inode,
1857 const char **ppath, int *ppathlen, u64 *pino,
1860 struct dentry *dentry;
1863 if (ceph_snap(inode) == CEPH_NOSNAP) {
1864 *pino = ceph_ino(inode);
1868 dentry = d_find_alias(inode);
1869 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1872 return PTR_ERR(path);
1879 * request arguments may be specified via an inode *, a dentry *, or
1880 * an explicit ino+path.
1882 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1883 struct inode *rdiri, const char *rpath,
1884 u64 rino, const char **ppath, int *pathlen,
1885 u64 *ino, int *freepath)
1890 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1891 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1893 } else if (rdentry) {
1894 r = build_dentry_path(rdentry, rdiri, ppath, pathlen, ino,
1896 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1898 } else if (rpath || rino) {
1901 *pathlen = rpath ? strlen(rpath) : 0;
1902 dout(" path %.*s\n", *pathlen, rpath);
1909 * called under mdsc->mutex
1911 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1912 struct ceph_mds_request *req,
1913 int mds, bool drop_cap_releases)
1915 struct ceph_msg *msg;
1916 struct ceph_mds_request_head *head;
1917 const char *path1 = NULL;
1918 const char *path2 = NULL;
1919 u64 ino1 = 0, ino2 = 0;
1920 int pathlen1 = 0, pathlen2 = 0;
1921 int freepath1 = 0, freepath2 = 0;
1927 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1928 req->r_parent, req->r_path1, req->r_ino1.ino,
1929 &path1, &pathlen1, &ino1, &freepath1);
1935 ret = set_request_path_attr(NULL, req->r_old_dentry,
1936 req->r_old_dentry_dir,
1937 req->r_path2, req->r_ino2.ino,
1938 &path2, &pathlen2, &ino2, &freepath2);
1944 len = sizeof(*head) +
1945 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1946 sizeof(struct ceph_timespec);
1948 /* calculate (max) length for cap releases */
1949 len += sizeof(struct ceph_mds_request_release) *
1950 (!!req->r_inode_drop + !!req->r_dentry_drop +
1951 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1952 if (req->r_dentry_drop)
1953 len += req->r_dentry->d_name.len;
1954 if (req->r_old_dentry_drop)
1955 len += req->r_old_dentry->d_name.len;
1957 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1959 msg = ERR_PTR(-ENOMEM);
1963 msg->hdr.version = cpu_to_le16(2);
1964 msg->hdr.tid = cpu_to_le64(req->r_tid);
1966 head = msg->front.iov_base;
1967 p = msg->front.iov_base + sizeof(*head);
1968 end = msg->front.iov_base + msg->front.iov_len;
1970 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1971 head->op = cpu_to_le32(req->r_op);
1972 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1973 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1974 head->args = req->r_args;
1976 ceph_encode_filepath(&p, end, ino1, path1);
1977 ceph_encode_filepath(&p, end, ino2, path2);
1979 /* make note of release offset, in case we need to replay */
1980 req->r_request_release_offset = p - msg->front.iov_base;
1984 if (req->r_inode_drop)
1985 releases += ceph_encode_inode_release(&p,
1986 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1987 mds, req->r_inode_drop, req->r_inode_unless, 0);
1988 if (req->r_dentry_drop)
1989 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1990 req->r_parent, mds, req->r_dentry_drop,
1991 req->r_dentry_unless);
1992 if (req->r_old_dentry_drop)
1993 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1994 req->r_old_dentry_dir, mds,
1995 req->r_old_dentry_drop,
1996 req->r_old_dentry_unless);
1997 if (req->r_old_inode_drop)
1998 releases += ceph_encode_inode_release(&p,
1999 d_inode(req->r_old_dentry),
2000 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
2002 if (drop_cap_releases) {
2004 p = msg->front.iov_base + req->r_request_release_offset;
2007 head->num_releases = cpu_to_le16(releases);
2011 struct ceph_timespec ts;
2012 ceph_encode_timespec(&ts, &req->r_stamp);
2013 ceph_encode_copy(&p, &ts, sizeof(ts));
2017 msg->front.iov_len = p - msg->front.iov_base;
2018 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2020 if (req->r_pagelist) {
2021 struct ceph_pagelist *pagelist = req->r_pagelist;
2022 refcount_inc(&pagelist->refcnt);
2023 ceph_msg_data_add_pagelist(msg, pagelist);
2024 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2026 msg->hdr.data_len = 0;
2029 msg->hdr.data_off = cpu_to_le16(0);
2033 kfree((char *)path2);
2036 kfree((char *)path1);
2042 * called under mdsc->mutex if error, under no mutex if
2045 static void complete_request(struct ceph_mds_client *mdsc,
2046 struct ceph_mds_request *req)
2048 if (req->r_callback)
2049 req->r_callback(mdsc, req);
2051 complete_all(&req->r_completion);
2055 * called under mdsc->mutex
2057 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2058 struct ceph_mds_request *req,
2059 int mds, bool drop_cap_releases)
2061 struct ceph_mds_request_head *rhead;
2062 struct ceph_msg *msg;
2067 struct ceph_cap *cap =
2068 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2071 req->r_sent_on_mseq = cap->mseq;
2073 req->r_sent_on_mseq = -1;
2075 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2076 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2078 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2081 * Replay. Do not regenerate message (and rebuild
2082 * paths, etc.); just use the original message.
2083 * Rebuilding paths will break for renames because
2084 * d_move mangles the src name.
2086 msg = req->r_request;
2087 rhead = msg->front.iov_base;
2089 flags = le32_to_cpu(rhead->flags);
2090 flags |= CEPH_MDS_FLAG_REPLAY;
2091 rhead->flags = cpu_to_le32(flags);
2093 if (req->r_target_inode)
2094 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2096 rhead->num_retry = req->r_attempts - 1;
2098 /* remove cap/dentry releases from message */
2099 rhead->num_releases = 0;
2102 p = msg->front.iov_base + req->r_request_release_offset;
2104 struct ceph_timespec ts;
2105 ceph_encode_timespec(&ts, &req->r_stamp);
2106 ceph_encode_copy(&p, &ts, sizeof(ts));
2109 msg->front.iov_len = p - msg->front.iov_base;
2110 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2114 if (req->r_request) {
2115 ceph_msg_put(req->r_request);
2116 req->r_request = NULL;
2118 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2120 req->r_err = PTR_ERR(msg);
2121 return PTR_ERR(msg);
2123 req->r_request = msg;
2125 rhead = msg->front.iov_base;
2126 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2127 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2128 flags |= CEPH_MDS_FLAG_REPLAY;
2130 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2131 rhead->flags = cpu_to_le32(flags);
2132 rhead->num_fwd = req->r_num_fwd;
2133 rhead->num_retry = req->r_attempts - 1;
2136 dout(" r_parent = %p\n", req->r_parent);
2141 * send request, or put it on the appropriate wait list.
2143 static int __do_request(struct ceph_mds_client *mdsc,
2144 struct ceph_mds_request *req)
2146 struct ceph_mds_session *session = NULL;
2150 if (req->r_err || test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2151 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
2152 __unregister_request(mdsc, req);
2156 if (req->r_timeout &&
2157 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2158 dout("do_request timed out\n");
2162 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2163 dout("do_request forced umount\n");
2167 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_MOUNTING) {
2168 if (mdsc->mdsmap_err) {
2169 err = mdsc->mdsmap_err;
2170 dout("do_request mdsmap err %d\n", err);
2173 if (mdsc->mdsmap->m_epoch == 0) {
2174 dout("do_request no mdsmap, waiting for map\n");
2175 list_add(&req->r_wait, &mdsc->waiting_for_map);
2178 if (!(mdsc->fsc->mount_options->flags &
2179 CEPH_MOUNT_OPT_MOUNTWAIT) &&
2180 !ceph_mdsmap_is_cluster_available(mdsc->mdsmap)) {
2182 pr_info("probably no mds server is up\n");
2187 put_request_session(req);
2189 mds = __choose_mds(mdsc, req);
2191 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2192 dout("do_request no mds or not active, waiting for map\n");
2193 list_add(&req->r_wait, &mdsc->waiting_for_map);
2197 /* get, open session */
2198 session = __ceph_lookup_mds_session(mdsc, mds);
2200 session = register_session(mdsc, mds);
2201 if (IS_ERR(session)) {
2202 err = PTR_ERR(session);
2206 req->r_session = get_session(session);
2208 dout("do_request mds%d session %p state %s\n", mds, session,
2209 ceph_session_state_name(session->s_state));
2210 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2211 session->s_state != CEPH_MDS_SESSION_HUNG) {
2212 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2216 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2217 session->s_state == CEPH_MDS_SESSION_CLOSING)
2218 __open_session(mdsc, session);
2219 list_add(&req->r_wait, &session->s_waiting);
2224 req->r_resend_mds = -1; /* forget any previous mds hint */
2226 if (req->r_request_started == 0) /* note request start time */
2227 req->r_request_started = jiffies;
2229 err = __prepare_send_request(mdsc, req, mds, false);
2231 ceph_msg_get(req->r_request);
2232 ceph_con_send(&session->s_con, req->r_request);
2236 ceph_put_mds_session(session);
2239 dout("__do_request early error %d\n", err);
2241 complete_request(mdsc, req);
2242 __unregister_request(mdsc, req);
2249 * called under mdsc->mutex
2251 static void __wake_requests(struct ceph_mds_client *mdsc,
2252 struct list_head *head)
2254 struct ceph_mds_request *req;
2255 LIST_HEAD(tmp_list);
2257 list_splice_init(head, &tmp_list);
2259 while (!list_empty(&tmp_list)) {
2260 req = list_entry(tmp_list.next,
2261 struct ceph_mds_request, r_wait);
2262 list_del_init(&req->r_wait);
2263 dout(" wake request %p tid %llu\n", req, req->r_tid);
2264 __do_request(mdsc, req);
2269 * Wake up threads with requests pending for @mds, so that they can
2270 * resubmit their requests to a possibly different mds.
2272 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2274 struct ceph_mds_request *req;
2275 struct rb_node *p = rb_first(&mdsc->request_tree);
2277 dout("kick_requests mds%d\n", mds);
2279 req = rb_entry(p, struct ceph_mds_request, r_node);
2281 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2283 if (req->r_attempts > 0)
2284 continue; /* only new requests */
2285 if (req->r_session &&
2286 req->r_session->s_mds == mds) {
2287 dout(" kicking tid %llu\n", req->r_tid);
2288 list_del_init(&req->r_wait);
2289 __do_request(mdsc, req);
2294 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2295 struct ceph_mds_request *req)
2297 dout("submit_request on %p\n", req);
2298 mutex_lock(&mdsc->mutex);
2299 __register_request(mdsc, req, NULL);
2300 __do_request(mdsc, req);
2301 mutex_unlock(&mdsc->mutex);
2305 * Synchrously perform an mds request. Take care of all of the
2306 * session setup, forwarding, retry details.
2308 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2310 struct ceph_mds_request *req)
2314 dout("do_request on %p\n", req);
2316 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2318 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2320 ceph_get_cap_refs(ceph_inode(req->r_parent), CEPH_CAP_PIN);
2321 if (req->r_old_dentry_dir)
2322 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2326 mutex_lock(&mdsc->mutex);
2327 __register_request(mdsc, req, dir);
2328 __do_request(mdsc, req);
2336 mutex_unlock(&mdsc->mutex);
2337 dout("do_request waiting\n");
2338 if (!req->r_timeout && req->r_wait_for_completion) {
2339 err = req->r_wait_for_completion(mdsc, req);
2341 long timeleft = wait_for_completion_killable_timeout(
2343 ceph_timeout_jiffies(req->r_timeout));
2347 err = -EIO; /* timed out */
2349 err = timeleft; /* killed */
2351 dout("do_request waited, got %d\n", err);
2352 mutex_lock(&mdsc->mutex);
2354 /* only abort if we didn't race with a real reply */
2355 if (test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags)) {
2356 err = le32_to_cpu(req->r_reply_info.head->result);
2357 } else if (err < 0) {
2358 dout("aborted request %lld with %d\n", req->r_tid, err);
2361 * ensure we aren't running concurrently with
2362 * ceph_fill_trace or ceph_readdir_prepopulate, which
2363 * rely on locks (dir mutex) held by our caller.
2365 mutex_lock(&req->r_fill_mutex);
2367 set_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags);
2368 mutex_unlock(&req->r_fill_mutex);
2370 if (req->r_parent &&
2371 (req->r_op & CEPH_MDS_OP_WRITE))
2372 ceph_invalidate_dir_request(req);
2378 mutex_unlock(&mdsc->mutex);
2379 dout("do_request %p done, result %d\n", req, err);
2384 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2385 * namespace request.
2387 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2389 struct inode *inode = req->r_parent;
2391 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2393 ceph_dir_clear_complete(inode);
2395 ceph_invalidate_dentry_lease(req->r_dentry);
2396 if (req->r_old_dentry)
2397 ceph_invalidate_dentry_lease(req->r_old_dentry);
2403 * We take the session mutex and parse and process the reply immediately.
2404 * This preserves the logical ordering of replies, capabilities, etc., sent
2405 * by the MDS as they are applied to our local cache.
2407 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2409 struct ceph_mds_client *mdsc = session->s_mdsc;
2410 struct ceph_mds_request *req;
2411 struct ceph_mds_reply_head *head = msg->front.iov_base;
2412 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2413 struct ceph_snap_realm *realm;
2416 int mds = session->s_mds;
2418 if (msg->front.iov_len < sizeof(*head)) {
2419 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2424 /* get request, session */
2425 tid = le64_to_cpu(msg->hdr.tid);
2426 mutex_lock(&mdsc->mutex);
2427 req = lookup_get_request(mdsc, tid);
2429 dout("handle_reply on unknown tid %llu\n", tid);
2430 mutex_unlock(&mdsc->mutex);
2433 dout("handle_reply %p\n", req);
2435 /* correct session? */
2436 if (req->r_session != session) {
2437 pr_err("mdsc_handle_reply got %llu on session mds%d"
2438 " not mds%d\n", tid, session->s_mds,
2439 req->r_session ? req->r_session->s_mds : -1);
2440 mutex_unlock(&mdsc->mutex);
2445 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags) && !head->safe) ||
2446 (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags) && head->safe)) {
2447 pr_warn("got a dup %s reply on %llu from mds%d\n",
2448 head->safe ? "safe" : "unsafe", tid, mds);
2449 mutex_unlock(&mdsc->mutex);
2452 if (test_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags)) {
2453 pr_warn("got unsafe after safe on %llu from mds%d\n",
2455 mutex_unlock(&mdsc->mutex);
2459 result = le32_to_cpu(head->result);
2463 * if we're not talking to the authority, send to them
2464 * if the authority has changed while we weren't looking,
2465 * send to new authority
2466 * Otherwise we just have to return an ESTALE
2468 if (result == -ESTALE) {
2469 dout("got ESTALE on request %llu", req->r_tid);
2470 req->r_resend_mds = -1;
2471 if (req->r_direct_mode != USE_AUTH_MDS) {
2472 dout("not using auth, setting for that now");
2473 req->r_direct_mode = USE_AUTH_MDS;
2474 __do_request(mdsc, req);
2475 mutex_unlock(&mdsc->mutex);
2478 int mds = __choose_mds(mdsc, req);
2479 if (mds >= 0 && mds != req->r_session->s_mds) {
2480 dout("but auth changed, so resending");
2481 __do_request(mdsc, req);
2482 mutex_unlock(&mdsc->mutex);
2486 dout("have to return ESTALE on request %llu", req->r_tid);
2491 set_bit(CEPH_MDS_R_GOT_SAFE, &req->r_req_flags);
2492 __unregister_request(mdsc, req);
2494 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2496 * We already handled the unsafe response, now do the
2497 * cleanup. No need to examine the response; the MDS
2498 * doesn't include any result info in the safe
2499 * response. And even if it did, there is nothing
2500 * useful we could do with a revised return value.
2502 dout("got safe reply %llu, mds%d\n", tid, mds);
2504 /* last unsafe request during umount? */
2505 if (mdsc->stopping && !__get_oldest_req(mdsc))
2506 complete_all(&mdsc->safe_umount_waiters);
2507 mutex_unlock(&mdsc->mutex);
2511 set_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags);
2512 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2513 if (req->r_unsafe_dir) {
2514 struct ceph_inode_info *ci =
2515 ceph_inode(req->r_unsafe_dir);
2516 spin_lock(&ci->i_unsafe_lock);
2517 list_add_tail(&req->r_unsafe_dir_item,
2518 &ci->i_unsafe_dirops);
2519 spin_unlock(&ci->i_unsafe_lock);
2523 dout("handle_reply tid %lld result %d\n", tid, result);
2524 rinfo = &req->r_reply_info;
2525 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2526 mutex_unlock(&mdsc->mutex);
2528 mutex_lock(&session->s_mutex);
2530 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2537 if (rinfo->snapblob_len) {
2538 down_write(&mdsc->snap_rwsem);
2539 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2540 rinfo->snapblob + rinfo->snapblob_len,
2541 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2543 downgrade_write(&mdsc->snap_rwsem);
2545 down_read(&mdsc->snap_rwsem);
2548 /* insert trace into our cache */
2549 mutex_lock(&req->r_fill_mutex);
2550 current->journal_info = req;
2551 err = ceph_fill_trace(mdsc->fsc->sb, req);
2553 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2554 req->r_op == CEPH_MDS_OP_LSSNAP))
2555 ceph_readdir_prepopulate(req, req->r_session);
2556 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2558 current->journal_info = NULL;
2559 mutex_unlock(&req->r_fill_mutex);
2561 up_read(&mdsc->snap_rwsem);
2563 ceph_put_snap_realm(mdsc, realm);
2565 if (err == 0 && req->r_target_inode &&
2566 test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags)) {
2567 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2568 spin_lock(&ci->i_unsafe_lock);
2569 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2570 spin_unlock(&ci->i_unsafe_lock);
2573 mutex_lock(&mdsc->mutex);
2574 if (!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2578 req->r_reply = ceph_msg_get(msg);
2579 set_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags);
2582 dout("reply arrived after request %lld was aborted\n", tid);
2584 mutex_unlock(&mdsc->mutex);
2586 mutex_unlock(&session->s_mutex);
2588 /* kick calling process */
2589 complete_request(mdsc, req);
2591 ceph_mdsc_put_request(req);
2598 * handle mds notification that our request has been forwarded.
2600 static void handle_forward(struct ceph_mds_client *mdsc,
2601 struct ceph_mds_session *session,
2602 struct ceph_msg *msg)
2604 struct ceph_mds_request *req;
2605 u64 tid = le64_to_cpu(msg->hdr.tid);
2609 void *p = msg->front.iov_base;
2610 void *end = p + msg->front.iov_len;
2612 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2613 next_mds = ceph_decode_32(&p);
2614 fwd_seq = ceph_decode_32(&p);
2616 mutex_lock(&mdsc->mutex);
2617 req = lookup_get_request(mdsc, tid);
2619 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2620 goto out; /* dup reply? */
2623 if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
2624 dout("forward tid %llu aborted, unregistering\n", tid);
2625 __unregister_request(mdsc, req);
2626 } else if (fwd_seq <= req->r_num_fwd) {
2627 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2628 tid, next_mds, req->r_num_fwd, fwd_seq);
2630 /* resend. forward race not possible; mds would drop */
2631 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2633 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT, &req->r_req_flags));
2634 req->r_attempts = 0;
2635 req->r_num_fwd = fwd_seq;
2636 req->r_resend_mds = next_mds;
2637 put_request_session(req);
2638 __do_request(mdsc, req);
2640 ceph_mdsc_put_request(req);
2642 mutex_unlock(&mdsc->mutex);
2646 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2650 * handle a mds session control message
2652 static void handle_session(struct ceph_mds_session *session,
2653 struct ceph_msg *msg)
2655 struct ceph_mds_client *mdsc = session->s_mdsc;
2658 int mds = session->s_mds;
2659 struct ceph_mds_session_head *h = msg->front.iov_base;
2663 if (msg->front.iov_len != sizeof(*h))
2665 op = le32_to_cpu(h->op);
2666 seq = le64_to_cpu(h->seq);
2668 mutex_lock(&mdsc->mutex);
2669 if (op == CEPH_SESSION_CLOSE) {
2670 get_session(session);
2671 __unregister_session(mdsc, session);
2673 /* FIXME: this ttl calculation is generous */
2674 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2675 mutex_unlock(&mdsc->mutex);
2677 mutex_lock(&session->s_mutex);
2679 dout("handle_session mds%d %s %p state %s seq %llu\n",
2680 mds, ceph_session_op_name(op), session,
2681 ceph_session_state_name(session->s_state), seq);
2683 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2684 session->s_state = CEPH_MDS_SESSION_OPEN;
2685 pr_info("mds%d came back\n", session->s_mds);
2689 case CEPH_SESSION_OPEN:
2690 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2691 pr_info("mds%d reconnect success\n", session->s_mds);
2692 session->s_state = CEPH_MDS_SESSION_OPEN;
2693 renewed_caps(mdsc, session, 0);
2696 __close_session(mdsc, session);
2699 case CEPH_SESSION_RENEWCAPS:
2700 if (session->s_renew_seq == seq)
2701 renewed_caps(mdsc, session, 1);
2704 case CEPH_SESSION_CLOSE:
2705 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2706 pr_info("mds%d reconnect denied\n", session->s_mds);
2707 cleanup_session_requests(mdsc, session);
2708 remove_session_caps(session);
2709 wake = 2; /* for good measure */
2710 wake_up_all(&mdsc->session_close_wq);
2713 case CEPH_SESSION_STALE:
2714 pr_info("mds%d caps went stale, renewing\n",
2716 spin_lock(&session->s_gen_ttl_lock);
2717 session->s_cap_gen++;
2718 session->s_cap_ttl = jiffies - 1;
2719 spin_unlock(&session->s_gen_ttl_lock);
2720 send_renew_caps(mdsc, session);
2723 case CEPH_SESSION_RECALL_STATE:
2724 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2727 case CEPH_SESSION_FLUSHMSG:
2728 send_flushmsg_ack(mdsc, session, seq);
2731 case CEPH_SESSION_FORCE_RO:
2732 dout("force_session_readonly %p\n", session);
2733 spin_lock(&session->s_cap_lock);
2734 session->s_readonly = true;
2735 spin_unlock(&session->s_cap_lock);
2736 wake_up_session_caps(session, 0);
2739 case CEPH_SESSION_REJECT:
2740 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2741 pr_info("mds%d rejected session\n", session->s_mds);
2742 session->s_state = CEPH_MDS_SESSION_REJECTED;
2743 cleanup_session_requests(mdsc, session);
2744 remove_session_caps(session);
2745 wake = 2; /* for good measure */
2749 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2753 mutex_unlock(&session->s_mutex);
2755 mutex_lock(&mdsc->mutex);
2756 __wake_requests(mdsc, &session->s_waiting);
2758 kick_requests(mdsc, mds);
2759 mutex_unlock(&mdsc->mutex);
2761 if (op == CEPH_SESSION_CLOSE)
2762 ceph_put_mds_session(session);
2766 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2767 (int)msg->front.iov_len);
2774 * called under session->mutex.
2776 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2777 struct ceph_mds_session *session)
2779 struct ceph_mds_request *req, *nreq;
2783 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2785 mutex_lock(&mdsc->mutex);
2786 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2787 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2789 ceph_msg_get(req->r_request);
2790 ceph_con_send(&session->s_con, req->r_request);
2795 * also re-send old requests when MDS enters reconnect stage. So that MDS
2796 * can process completed request in clientreplay stage.
2798 p = rb_first(&mdsc->request_tree);
2800 req = rb_entry(p, struct ceph_mds_request, r_node);
2802 if (test_bit(CEPH_MDS_R_GOT_UNSAFE, &req->r_req_flags))
2804 if (req->r_attempts == 0)
2805 continue; /* only old requests */
2806 if (req->r_session &&
2807 req->r_session->s_mds == session->s_mds) {
2808 err = __prepare_send_request(mdsc, req,
2809 session->s_mds, true);
2811 ceph_msg_get(req->r_request);
2812 ceph_con_send(&session->s_con, req->r_request);
2816 mutex_unlock(&mdsc->mutex);
2820 * Encode information about a cap for a reconnect with the MDS.
2822 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2826 struct ceph_mds_cap_reconnect v2;
2827 struct ceph_mds_cap_reconnect_v1 v1;
2829 struct ceph_inode_info *ci;
2830 struct ceph_reconnect_state *recon_state = arg;
2831 struct ceph_pagelist *pagelist = recon_state->pagelist;
2836 struct dentry *dentry;
2840 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2841 inode, ceph_vinop(inode), cap, cap->cap_id,
2842 ceph_cap_string(cap->issued));
2843 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2847 dentry = d_find_alias(inode);
2849 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2851 err = PTR_ERR(path);
2860 spin_lock(&ci->i_ceph_lock);
2861 cap->seq = 0; /* reset cap seq */
2862 cap->issue_seq = 0; /* and issue_seq */
2863 cap->mseq = 0; /* and migrate_seq */
2864 cap->cap_gen = cap->session->s_cap_gen;
2866 if (recon_state->msg_version >= 2) {
2867 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2868 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2869 rec.v2.issued = cpu_to_le32(cap->issued);
2870 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2871 rec.v2.pathbase = cpu_to_le64(pathbase);
2872 rec.v2.flock_len = 0;
2874 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2875 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2876 rec.v1.issued = cpu_to_le32(cap->issued);
2877 rec.v1.size = cpu_to_le64(inode->i_size);
2878 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2879 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2880 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2881 rec.v1.pathbase = cpu_to_le64(pathbase);
2884 if (list_empty(&ci->i_cap_snaps)) {
2885 snap_follows = ci->i_head_snapc ? ci->i_head_snapc->seq : 0;
2887 struct ceph_cap_snap *capsnap =
2888 list_first_entry(&ci->i_cap_snaps,
2889 struct ceph_cap_snap, ci_item);
2890 snap_follows = capsnap->follows;
2892 spin_unlock(&ci->i_ceph_lock);
2894 if (recon_state->msg_version >= 2) {
2895 int num_fcntl_locks, num_flock_locks;
2896 struct ceph_filelock *flocks;
2897 size_t struct_len, total_len = 0;
2901 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2902 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2903 sizeof(struct ceph_filelock), GFP_NOFS);
2908 err = ceph_encode_locks_to_buffer(inode, flocks,
2918 if (recon_state->msg_version >= 3) {
2919 /* version, compat_version and struct_len */
2920 total_len = 2 * sizeof(u8) + sizeof(u32);
2924 * number of encoded locks is stable, so copy to pagelist
2926 struct_len = 2 * sizeof(u32) +
2927 (num_fcntl_locks + num_flock_locks) *
2928 sizeof(struct ceph_filelock);
2929 rec.v2.flock_len = cpu_to_le32(struct_len);
2931 struct_len += sizeof(rec.v2);
2932 struct_len += sizeof(u32) + pathlen;
2935 struct_len += sizeof(u64); /* snap_follows */
2937 total_len += struct_len;
2938 err = ceph_pagelist_reserve(pagelist, total_len);
2941 if (recon_state->msg_version >= 3) {
2942 ceph_pagelist_encode_8(pagelist, struct_v);
2943 ceph_pagelist_encode_8(pagelist, 1);
2944 ceph_pagelist_encode_32(pagelist, struct_len);
2946 ceph_pagelist_encode_string(pagelist, path, pathlen);
2947 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2948 ceph_locks_to_pagelist(flocks, pagelist,
2952 ceph_pagelist_encode_64(pagelist, snap_follows);
2956 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2957 err = ceph_pagelist_reserve(pagelist, size);
2959 ceph_pagelist_encode_string(pagelist, path, pathlen);
2960 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2964 recon_state->nr_caps++;
2974 * If an MDS fails and recovers, clients need to reconnect in order to
2975 * reestablish shared state. This includes all caps issued through
2976 * this session _and_ the snap_realm hierarchy. Because it's not
2977 * clear which snap realms the mds cares about, we send everything we
2978 * know about.. that ensures we'll then get any new info the
2979 * recovering MDS might have.
2981 * This is a relatively heavyweight operation, but it's rare.
2983 * called with mdsc->mutex held.
2985 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2986 struct ceph_mds_session *session)
2988 struct ceph_msg *reply;
2990 int mds = session->s_mds;
2993 struct ceph_pagelist *pagelist;
2994 struct ceph_reconnect_state recon_state;
2996 pr_info("mds%d reconnect start\n", mds);
2998 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
3000 goto fail_nopagelist;
3001 ceph_pagelist_init(pagelist);
3003 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
3007 mutex_lock(&session->s_mutex);
3008 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
3011 dout("session %p state %s\n", session,
3012 ceph_session_state_name(session->s_state));
3014 spin_lock(&session->s_gen_ttl_lock);
3015 session->s_cap_gen++;
3016 spin_unlock(&session->s_gen_ttl_lock);
3018 spin_lock(&session->s_cap_lock);
3019 /* don't know if session is readonly */
3020 session->s_readonly = 0;
3022 * notify __ceph_remove_cap() that we are composing cap reconnect.
3023 * If a cap get released before being added to the cap reconnect,
3024 * __ceph_remove_cap() should skip queuing cap release.
3026 session->s_cap_reconnect = 1;
3027 /* drop old cap expires; we're about to reestablish that state */
3028 cleanup_cap_releases(mdsc, session);
3030 /* trim unused caps to reduce MDS's cache rejoin time */
3031 if (mdsc->fsc->sb->s_root)
3032 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3034 ceph_con_close(&session->s_con);
3035 ceph_con_open(&session->s_con,
3036 CEPH_ENTITY_TYPE_MDS, mds,
3037 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3039 /* replay unsafe requests */
3040 replay_unsafe_requests(mdsc, session);
3042 down_read(&mdsc->snap_rwsem);
3044 /* traverse this session's caps */
3045 s_nr_caps = session->s_nr_caps;
3046 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
3050 recon_state.nr_caps = 0;
3051 recon_state.pagelist = pagelist;
3052 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3053 recon_state.msg_version = 3;
3054 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3055 recon_state.msg_version = 2;
3057 recon_state.msg_version = 1;
3058 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
3062 spin_lock(&session->s_cap_lock);
3063 session->s_cap_reconnect = 0;
3064 spin_unlock(&session->s_cap_lock);
3067 * snaprealms. we provide mds with the ino, seq (version), and
3068 * parent for all of our realms. If the mds has any newer info,
3071 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3072 struct ceph_snap_realm *realm =
3073 rb_entry(p, struct ceph_snap_realm, node);
3074 struct ceph_mds_snaprealm_reconnect sr_rec;
3076 dout(" adding snap realm %llx seq %lld parent %llx\n",
3077 realm->ino, realm->seq, realm->parent_ino);
3078 sr_rec.ino = cpu_to_le64(realm->ino);
3079 sr_rec.seq = cpu_to_le64(realm->seq);
3080 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3081 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3086 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3088 /* raced with cap release? */
3089 if (s_nr_caps != recon_state.nr_caps) {
3090 struct page *page = list_first_entry(&pagelist->head,
3092 __le32 *addr = kmap_atomic(page);
3093 *addr = cpu_to_le32(recon_state.nr_caps);
3094 kunmap_atomic(addr);
3097 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3098 ceph_msg_data_add_pagelist(reply, pagelist);
3100 ceph_early_kick_flushing_caps(mdsc, session);
3102 ceph_con_send(&session->s_con, reply);
3104 mutex_unlock(&session->s_mutex);
3106 mutex_lock(&mdsc->mutex);
3107 __wake_requests(mdsc, &session->s_waiting);
3108 mutex_unlock(&mdsc->mutex);
3110 up_read(&mdsc->snap_rwsem);
3114 ceph_msg_put(reply);
3115 up_read(&mdsc->snap_rwsem);
3116 mutex_unlock(&session->s_mutex);
3118 ceph_pagelist_release(pagelist);
3120 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3126 * compare old and new mdsmaps, kicking requests
3127 * and closing out old connections as necessary
3129 * called under mdsc->mutex.
3131 static void check_new_map(struct ceph_mds_client *mdsc,
3132 struct ceph_mdsmap *newmap,
3133 struct ceph_mdsmap *oldmap)
3136 int oldstate, newstate;
3137 struct ceph_mds_session *s;
3139 dout("check_new_map new %u old %u\n",
3140 newmap->m_epoch, oldmap->m_epoch);
3142 for (i = 0; i < oldmap->m_num_mds && i < mdsc->max_sessions; i++) {
3143 if (!mdsc->sessions[i])
3145 s = mdsc->sessions[i];
3146 oldstate = ceph_mdsmap_get_state(oldmap, i);
3147 newstate = ceph_mdsmap_get_state(newmap, i);
3149 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3150 i, ceph_mds_state_name(oldstate),
3151 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3152 ceph_mds_state_name(newstate),
3153 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3154 ceph_session_state_name(s->s_state));
3156 if (i >= newmap->m_num_mds ||
3157 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3158 ceph_mdsmap_get_addr(newmap, i),
3159 sizeof(struct ceph_entity_addr))) {
3160 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3161 /* the session never opened, just close it
3164 __unregister_session(mdsc, s);
3165 __wake_requests(mdsc, &s->s_waiting);
3166 ceph_put_mds_session(s);
3167 } else if (i >= newmap->m_num_mds) {
3168 /* force close session for stopped mds */
3170 __unregister_session(mdsc, s);
3171 __wake_requests(mdsc, &s->s_waiting);
3172 kick_requests(mdsc, i);
3173 mutex_unlock(&mdsc->mutex);
3175 mutex_lock(&s->s_mutex);
3176 cleanup_session_requests(mdsc, s);
3177 remove_session_caps(s);
3178 mutex_unlock(&s->s_mutex);
3180 ceph_put_mds_session(s);
3182 mutex_lock(&mdsc->mutex);
3185 mutex_unlock(&mdsc->mutex);
3186 mutex_lock(&s->s_mutex);
3187 mutex_lock(&mdsc->mutex);
3188 ceph_con_close(&s->s_con);
3189 mutex_unlock(&s->s_mutex);
3190 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3192 } else if (oldstate == newstate) {
3193 continue; /* nothing new with this mds */
3199 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3200 newstate >= CEPH_MDS_STATE_RECONNECT) {
3201 mutex_unlock(&mdsc->mutex);
3202 send_mds_reconnect(mdsc, s);
3203 mutex_lock(&mdsc->mutex);
3207 * kick request on any mds that has gone active.
3209 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3210 newstate >= CEPH_MDS_STATE_ACTIVE) {
3211 if (oldstate != CEPH_MDS_STATE_CREATING &&
3212 oldstate != CEPH_MDS_STATE_STARTING)
3213 pr_info("mds%d recovery completed\n", s->s_mds);
3214 kick_requests(mdsc, i);
3215 ceph_kick_flushing_caps(mdsc, s);
3216 wake_up_session_caps(s, 1);
3220 for (i = 0; i < newmap->m_num_mds && i < mdsc->max_sessions; i++) {
3221 s = mdsc->sessions[i];
3224 if (!ceph_mdsmap_is_laggy(newmap, i))
3226 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3227 s->s_state == CEPH_MDS_SESSION_HUNG ||
3228 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3229 dout(" connecting to export targets of laggy mds%d\n",
3231 __open_export_target_sessions(mdsc, s);
3243 * caller must hold session s_mutex, dentry->d_lock
3245 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3247 struct ceph_dentry_info *di = ceph_dentry(dentry);
3249 ceph_put_mds_session(di->lease_session);
3250 di->lease_session = NULL;
3253 static void handle_lease(struct ceph_mds_client *mdsc,
3254 struct ceph_mds_session *session,
3255 struct ceph_msg *msg)
3257 struct super_block *sb = mdsc->fsc->sb;
3258 struct inode *inode;
3259 struct dentry *parent, *dentry;
3260 struct ceph_dentry_info *di;
3261 int mds = session->s_mds;
3262 struct ceph_mds_lease *h = msg->front.iov_base;
3264 struct ceph_vino vino;
3268 dout("handle_lease from mds%d\n", mds);
3271 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3273 vino.ino = le64_to_cpu(h->ino);
3274 vino.snap = CEPH_NOSNAP;
3275 seq = le32_to_cpu(h->seq);
3276 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3277 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3278 if (dname.len != get_unaligned_le32(h+1))
3282 inode = ceph_find_inode(sb, vino);
3283 dout("handle_lease %s, ino %llx %p %.*s\n",
3284 ceph_lease_op_name(h->action), vino.ino, inode,
3285 dname.len, dname.name);
3287 mutex_lock(&session->s_mutex);
3291 dout("handle_lease no inode %llx\n", vino.ino);
3296 parent = d_find_alias(inode);
3298 dout("no parent dentry on inode %p\n", inode);
3300 goto release; /* hrm... */
3302 dname.hash = full_name_hash(parent, dname.name, dname.len);
3303 dentry = d_lookup(parent, &dname);
3308 spin_lock(&dentry->d_lock);
3309 di = ceph_dentry(dentry);
3310 switch (h->action) {
3311 case CEPH_MDS_LEASE_REVOKE:
3312 if (di->lease_session == session) {
3313 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3314 h->seq = cpu_to_le32(di->lease_seq);
3315 __ceph_mdsc_drop_dentry_lease(dentry);
3320 case CEPH_MDS_LEASE_RENEW:
3321 if (di->lease_session == session &&
3322 di->lease_gen == session->s_cap_gen &&
3323 di->lease_renew_from &&
3324 di->lease_renew_after == 0) {
3325 unsigned long duration =
3326 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3328 di->lease_seq = seq;
3329 di->time = di->lease_renew_from + duration;
3330 di->lease_renew_after = di->lease_renew_from +
3332 di->lease_renew_from = 0;
3336 spin_unlock(&dentry->d_lock);
3343 /* let's just reuse the same message */
3344 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3346 ceph_con_send(&session->s_con, msg);
3350 mutex_unlock(&session->s_mutex);
3354 pr_err("corrupt lease message\n");
3358 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3359 struct inode *inode,
3360 struct dentry *dentry, char action,
3363 struct ceph_msg *msg;
3364 struct ceph_mds_lease *lease;
3365 int len = sizeof(*lease) + sizeof(u32);
3368 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3369 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3370 dnamelen = dentry->d_name.len;
3373 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3376 lease = msg->front.iov_base;
3377 lease->action = action;
3378 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3379 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3380 lease->seq = cpu_to_le32(seq);
3381 put_unaligned_le32(dnamelen, lease + 1);
3382 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3385 * if this is a preemptive lease RELEASE, no need to
3386 * flush request stream, since the actual request will
3389 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3391 ceph_con_send(&session->s_con, msg);
3395 * drop all leases (and dentry refs) in preparation for umount
3397 static void drop_leases(struct ceph_mds_client *mdsc)
3401 dout("drop_leases\n");
3402 mutex_lock(&mdsc->mutex);
3403 for (i = 0; i < mdsc->max_sessions; i++) {
3404 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3407 mutex_unlock(&mdsc->mutex);
3408 mutex_lock(&s->s_mutex);
3409 mutex_unlock(&s->s_mutex);
3410 ceph_put_mds_session(s);
3411 mutex_lock(&mdsc->mutex);
3413 mutex_unlock(&mdsc->mutex);
3419 * delayed work -- periodically trim expired leases, renew caps with mds
3421 static void schedule_delayed(struct ceph_mds_client *mdsc)
3424 unsigned hz = round_jiffies_relative(HZ * delay);
3425 schedule_delayed_work(&mdsc->delayed_work, hz);
3428 static void delayed_work(struct work_struct *work)
3431 struct ceph_mds_client *mdsc =
3432 container_of(work, struct ceph_mds_client, delayed_work.work);
3436 dout("mdsc delayed_work\n");
3437 ceph_check_delayed_caps(mdsc);
3439 mutex_lock(&mdsc->mutex);
3440 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3441 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3442 mdsc->last_renew_caps);
3444 mdsc->last_renew_caps = jiffies;
3446 for (i = 0; i < mdsc->max_sessions; i++) {
3447 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3450 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3451 dout("resending session close request for mds%d\n",
3453 request_close_session(mdsc, s);
3454 ceph_put_mds_session(s);
3457 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3458 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3459 s->s_state = CEPH_MDS_SESSION_HUNG;
3460 pr_info("mds%d hung\n", s->s_mds);
3463 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3464 /* this mds is failed or recovering, just wait */
3465 ceph_put_mds_session(s);
3468 mutex_unlock(&mdsc->mutex);
3470 mutex_lock(&s->s_mutex);
3472 send_renew_caps(mdsc, s);
3474 ceph_con_keepalive(&s->s_con);
3475 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3476 s->s_state == CEPH_MDS_SESSION_HUNG)
3477 ceph_send_cap_releases(mdsc, s);
3478 mutex_unlock(&s->s_mutex);
3479 ceph_put_mds_session(s);
3481 mutex_lock(&mdsc->mutex);
3483 mutex_unlock(&mdsc->mutex);
3485 schedule_delayed(mdsc);
3488 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3491 struct ceph_mds_client *mdsc;
3493 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3498 mutex_init(&mdsc->mutex);
3499 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3500 if (!mdsc->mdsmap) {
3505 init_completion(&mdsc->safe_umount_waiters);
3506 init_waitqueue_head(&mdsc->session_close_wq);
3507 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3508 mdsc->sessions = NULL;
3509 atomic_set(&mdsc->num_sessions, 0);
3510 mdsc->max_sessions = 0;
3512 mdsc->last_snap_seq = 0;
3513 init_rwsem(&mdsc->snap_rwsem);
3514 mdsc->snap_realms = RB_ROOT;
3515 INIT_LIST_HEAD(&mdsc->snap_empty);
3516 spin_lock_init(&mdsc->snap_empty_lock);
3518 mdsc->oldest_tid = 0;
3519 mdsc->request_tree = RB_ROOT;
3520 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3521 mdsc->last_renew_caps = jiffies;
3522 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3523 spin_lock_init(&mdsc->cap_delay_lock);
3524 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3525 spin_lock_init(&mdsc->snap_flush_lock);
3526 mdsc->last_cap_flush_tid = 1;
3527 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3528 INIT_LIST_HEAD(&mdsc->cap_dirty);
3529 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3530 mdsc->num_cap_flushing = 0;
3531 spin_lock_init(&mdsc->cap_dirty_lock);
3532 init_waitqueue_head(&mdsc->cap_flushing_wq);
3533 spin_lock_init(&mdsc->dentry_lru_lock);
3534 INIT_LIST_HEAD(&mdsc->dentry_lru);
3536 ceph_caps_init(mdsc);
3537 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3539 init_rwsem(&mdsc->pool_perm_rwsem);
3540 mdsc->pool_perm_tree = RB_ROOT;
3542 strncpy(mdsc->nodename, utsname()->nodename,
3543 sizeof(mdsc->nodename) - 1);
3548 * Wait for safe replies on open mds requests. If we time out, drop
3549 * all requests from the tree to avoid dangling dentry refs.
3551 static void wait_requests(struct ceph_mds_client *mdsc)
3553 struct ceph_options *opts = mdsc->fsc->client->options;
3554 struct ceph_mds_request *req;
3556 mutex_lock(&mdsc->mutex);
3557 if (__get_oldest_req(mdsc)) {
3558 mutex_unlock(&mdsc->mutex);
3560 dout("wait_requests waiting for requests\n");
3561 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3562 ceph_timeout_jiffies(opts->mount_timeout));
3564 /* tear down remaining requests */
3565 mutex_lock(&mdsc->mutex);
3566 while ((req = __get_oldest_req(mdsc))) {
3567 dout("wait_requests timed out on tid %llu\n",
3569 __unregister_request(mdsc, req);
3572 mutex_unlock(&mdsc->mutex);
3573 dout("wait_requests done\n");
3577 * called before mount is ro, and before dentries are torn down.
3578 * (hmm, does this still race with new lookups?)
3580 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3582 dout("pre_umount\n");
3586 ceph_flush_dirty_caps(mdsc);
3587 wait_requests(mdsc);
3590 * wait for reply handlers to drop their request refs and
3591 * their inode/dcache refs
3597 * wait for all write mds requests to flush.
3599 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3601 struct ceph_mds_request *req = NULL, *nextreq;
3604 mutex_lock(&mdsc->mutex);
3605 dout("wait_unsafe_requests want %lld\n", want_tid);
3607 req = __get_oldest_req(mdsc);
3608 while (req && req->r_tid <= want_tid) {
3609 /* find next request */
3610 n = rb_next(&req->r_node);
3612 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3615 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3616 (req->r_op & CEPH_MDS_OP_WRITE)) {
3618 ceph_mdsc_get_request(req);
3620 ceph_mdsc_get_request(nextreq);
3621 mutex_unlock(&mdsc->mutex);
3622 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3623 req->r_tid, want_tid);
3624 wait_for_completion(&req->r_safe_completion);
3625 mutex_lock(&mdsc->mutex);
3626 ceph_mdsc_put_request(req);
3628 break; /* next dne before, so we're done! */
3629 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3630 /* next request was removed from tree */
3631 ceph_mdsc_put_request(nextreq);
3634 ceph_mdsc_put_request(nextreq); /* won't go away */
3638 mutex_unlock(&mdsc->mutex);
3639 dout("wait_unsafe_requests done\n");
3642 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3644 u64 want_tid, want_flush;
3646 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3650 mutex_lock(&mdsc->mutex);
3651 want_tid = mdsc->last_tid;
3652 mutex_unlock(&mdsc->mutex);
3654 ceph_flush_dirty_caps(mdsc);
3655 spin_lock(&mdsc->cap_dirty_lock);
3656 want_flush = mdsc->last_cap_flush_tid;
3657 if (!list_empty(&mdsc->cap_flush_list)) {
3658 struct ceph_cap_flush *cf =
3659 list_last_entry(&mdsc->cap_flush_list,
3660 struct ceph_cap_flush, g_list);
3663 spin_unlock(&mdsc->cap_dirty_lock);
3665 dout("sync want tid %lld flush_seq %lld\n",
3666 want_tid, want_flush);
3668 wait_unsafe_requests(mdsc, want_tid);
3669 wait_caps_flush(mdsc, want_flush);
3673 * true if all sessions are closed, or we force unmount
3675 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3677 if (READ_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3679 return atomic_read(&mdsc->num_sessions) <= skipped;
3683 * called after sb is ro.
3685 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3687 struct ceph_options *opts = mdsc->fsc->client->options;
3688 struct ceph_mds_session *session;
3692 dout("close_sessions\n");
3694 /* close sessions */
3695 mutex_lock(&mdsc->mutex);
3696 for (i = 0; i < mdsc->max_sessions; i++) {
3697 session = __ceph_lookup_mds_session(mdsc, i);
3700 mutex_unlock(&mdsc->mutex);
3701 mutex_lock(&session->s_mutex);
3702 if (__close_session(mdsc, session) <= 0)
3704 mutex_unlock(&session->s_mutex);
3705 ceph_put_mds_session(session);
3706 mutex_lock(&mdsc->mutex);
3708 mutex_unlock(&mdsc->mutex);
3710 dout("waiting for sessions to close\n");
3711 wait_event_timeout(mdsc->session_close_wq,
3712 done_closing_sessions(mdsc, skipped),
3713 ceph_timeout_jiffies(opts->mount_timeout));
3715 /* tear down remaining sessions */
3716 mutex_lock(&mdsc->mutex);
3717 for (i = 0; i < mdsc->max_sessions; i++) {
3718 if (mdsc->sessions[i]) {
3719 session = get_session(mdsc->sessions[i]);
3720 __unregister_session(mdsc, session);
3721 mutex_unlock(&mdsc->mutex);
3722 mutex_lock(&session->s_mutex);
3723 remove_session_caps(session);
3724 mutex_unlock(&session->s_mutex);
3725 ceph_put_mds_session(session);
3726 mutex_lock(&mdsc->mutex);
3729 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3730 mutex_unlock(&mdsc->mutex);
3732 ceph_cleanup_empty_realms(mdsc);
3734 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3739 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3741 struct ceph_mds_session *session;
3744 dout("force umount\n");
3746 mutex_lock(&mdsc->mutex);
3747 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3748 session = __ceph_lookup_mds_session(mdsc, mds);
3751 mutex_unlock(&mdsc->mutex);
3752 mutex_lock(&session->s_mutex);
3753 __close_session(mdsc, session);
3754 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3755 cleanup_session_requests(mdsc, session);
3756 remove_session_caps(session);
3758 mutex_unlock(&session->s_mutex);
3759 ceph_put_mds_session(session);
3760 mutex_lock(&mdsc->mutex);
3761 kick_requests(mdsc, mds);
3763 __wake_requests(mdsc, &mdsc->waiting_for_map);
3764 mutex_unlock(&mdsc->mutex);
3767 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3770 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3772 ceph_mdsmap_destroy(mdsc->mdsmap);
3773 kfree(mdsc->sessions);
3774 ceph_caps_finalize(mdsc);
3775 ceph_pool_perm_destroy(mdsc);
3778 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3780 struct ceph_mds_client *mdsc = fsc->mdsc;
3781 dout("mdsc_destroy %p\n", mdsc);
3783 /* flush out any connection work with references to us */
3786 ceph_mdsc_stop(mdsc);
3790 dout("mdsc_destroy %p done\n", mdsc);
3793 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3795 struct ceph_fs_client *fsc = mdsc->fsc;
3796 const char *mds_namespace = fsc->mount_options->mds_namespace;
3797 void *p = msg->front.iov_base;
3798 void *end = p + msg->front.iov_len;
3802 u32 mount_fscid = (u32)-1;
3803 u8 struct_v, struct_cv;
3806 ceph_decode_need(&p, end, sizeof(u32), bad);
3807 epoch = ceph_decode_32(&p);
3809 dout("handle_fsmap epoch %u\n", epoch);
3811 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3812 struct_v = ceph_decode_8(&p);
3813 struct_cv = ceph_decode_8(&p);
3814 map_len = ceph_decode_32(&p);
3816 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3817 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3819 num_fs = ceph_decode_32(&p);
3820 while (num_fs-- > 0) {
3821 void *info_p, *info_end;
3826 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3827 info_v = ceph_decode_8(&p);
3828 info_cv = ceph_decode_8(&p);
3829 info_len = ceph_decode_32(&p);
3830 ceph_decode_need(&p, end, info_len, bad);
3832 info_end = p + info_len;
3835 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3836 fscid = ceph_decode_32(&info_p);
3837 namelen = ceph_decode_32(&info_p);
3838 ceph_decode_need(&info_p, info_end, namelen, bad);
3840 if (mds_namespace &&
3841 strlen(mds_namespace) == namelen &&
3842 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3843 mount_fscid = fscid;
3848 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3849 if (mount_fscid != (u32)-1) {
3850 fsc->client->monc.fs_cluster_id = mount_fscid;
3851 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3853 ceph_monc_renew_subs(&fsc->client->monc);
3860 pr_err("error decoding fsmap\n");
3862 mutex_lock(&mdsc->mutex);
3863 mdsc->mdsmap_err = -ENOENT;
3864 __wake_requests(mdsc, &mdsc->waiting_for_map);
3865 mutex_unlock(&mdsc->mutex);
3870 * handle mds map update.
3872 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3876 void *p = msg->front.iov_base;
3877 void *end = p + msg->front.iov_len;
3878 struct ceph_mdsmap *newmap, *oldmap;
3879 struct ceph_fsid fsid;
3882 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3883 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3884 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3886 epoch = ceph_decode_32(&p);
3887 maplen = ceph_decode_32(&p);
3888 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3890 /* do we need it? */
3891 mutex_lock(&mdsc->mutex);
3892 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3893 dout("handle_map epoch %u <= our %u\n",
3894 epoch, mdsc->mdsmap->m_epoch);
3895 mutex_unlock(&mdsc->mutex);
3899 newmap = ceph_mdsmap_decode(&p, end);
3900 if (IS_ERR(newmap)) {
3901 err = PTR_ERR(newmap);
3905 /* swap into place */
3907 oldmap = mdsc->mdsmap;
3908 mdsc->mdsmap = newmap;
3909 check_new_map(mdsc, newmap, oldmap);
3910 ceph_mdsmap_destroy(oldmap);
3912 mdsc->mdsmap = newmap; /* first mds map */
3914 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3916 __wake_requests(mdsc, &mdsc->waiting_for_map);
3917 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3918 mdsc->mdsmap->m_epoch);
3920 mutex_unlock(&mdsc->mutex);
3921 schedule_delayed(mdsc);
3925 mutex_unlock(&mdsc->mutex);
3927 pr_err("error decoding mdsmap %d\n", err);
3931 static struct ceph_connection *con_get(struct ceph_connection *con)
3933 struct ceph_mds_session *s = con->private;
3935 if (get_session(s)) {
3936 dout("mdsc con_get %p ok (%d)\n", s, refcount_read(&s->s_ref));
3939 dout("mdsc con_get %p FAIL\n", s);
3943 static void con_put(struct ceph_connection *con)
3945 struct ceph_mds_session *s = con->private;
3947 dout("mdsc con_put %p (%d)\n", s, refcount_read(&s->s_ref) - 1);
3948 ceph_put_mds_session(s);
3952 * if the client is unresponsive for long enough, the mds will kill
3953 * the session entirely.
3955 static void peer_reset(struct ceph_connection *con)
3957 struct ceph_mds_session *s = con->private;
3958 struct ceph_mds_client *mdsc = s->s_mdsc;
3960 pr_warn("mds%d closed our session\n", s->s_mds);
3961 send_mds_reconnect(mdsc, s);
3964 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3966 struct ceph_mds_session *s = con->private;
3967 struct ceph_mds_client *mdsc = s->s_mdsc;
3968 int type = le16_to_cpu(msg->hdr.type);
3970 mutex_lock(&mdsc->mutex);
3971 if (__verify_registered_session(mdsc, s) < 0) {
3972 mutex_unlock(&mdsc->mutex);
3975 mutex_unlock(&mdsc->mutex);
3978 case CEPH_MSG_MDS_MAP:
3979 ceph_mdsc_handle_mdsmap(mdsc, msg);
3981 case CEPH_MSG_FS_MAP_USER:
3982 ceph_mdsc_handle_fsmap(mdsc, msg);
3984 case CEPH_MSG_CLIENT_SESSION:
3985 handle_session(s, msg);
3987 case CEPH_MSG_CLIENT_REPLY:
3988 handle_reply(s, msg);
3990 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3991 handle_forward(mdsc, s, msg);
3993 case CEPH_MSG_CLIENT_CAPS:
3994 ceph_handle_caps(s, msg);
3996 case CEPH_MSG_CLIENT_SNAP:
3997 ceph_handle_snap(mdsc, s, msg);
3999 case CEPH_MSG_CLIENT_LEASE:
4000 handle_lease(mdsc, s, msg);
4004 pr_err("received unknown message type %d %s\n", type,
4005 ceph_msg_type_name(type));
4016 * Note: returned pointer is the address of a structure that's
4017 * managed separately. Caller must *not* attempt to free it.
4019 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
4020 int *proto, int force_new)
4022 struct ceph_mds_session *s = con->private;
4023 struct ceph_mds_client *mdsc = s->s_mdsc;
4024 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4025 struct ceph_auth_handshake *auth = &s->s_auth;
4027 if (force_new && auth->authorizer) {
4028 ceph_auth_destroy_authorizer(auth->authorizer);
4029 auth->authorizer = NULL;
4031 if (!auth->authorizer) {
4032 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4035 return ERR_PTR(ret);
4037 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4040 return ERR_PTR(ret);
4042 *proto = ac->protocol;
4048 static int verify_authorizer_reply(struct ceph_connection *con)
4050 struct ceph_mds_session *s = con->private;
4051 struct ceph_mds_client *mdsc = s->s_mdsc;
4052 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4054 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4057 static int invalidate_authorizer(struct ceph_connection *con)
4059 struct ceph_mds_session *s = con->private;
4060 struct ceph_mds_client *mdsc = s->s_mdsc;
4061 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4063 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4065 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4068 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4069 struct ceph_msg_header *hdr, int *skip)
4071 struct ceph_msg *msg;
4072 int type = (int) le16_to_cpu(hdr->type);
4073 int front_len = (int) le32_to_cpu(hdr->front_len);
4079 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4081 pr_err("unable to allocate msg type %d len %d\n",
4089 static int mds_sign_message(struct ceph_msg *msg)
4091 struct ceph_mds_session *s = msg->con->private;
4092 struct ceph_auth_handshake *auth = &s->s_auth;
4094 return ceph_auth_sign_message(auth, msg);
4097 static int mds_check_message_signature(struct ceph_msg *msg)
4099 struct ceph_mds_session *s = msg->con->private;
4100 struct ceph_auth_handshake *auth = &s->s_auth;
4102 return ceph_auth_check_message_signature(auth, msg);
4105 static const struct ceph_connection_operations mds_con_ops = {
4108 .dispatch = dispatch,
4109 .get_authorizer = get_authorizer,
4110 .verify_authorizer_reply = verify_authorizer_reply,
4111 .invalidate_authorizer = invalidate_authorizer,
4112 .peer_reset = peer_reset,
4113 .alloc_msg = mds_alloc_msg,
4114 .sign_message = mds_sign_message,
4115 .check_message_signature = mds_check_message_signature,