1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/sched.h>
7 #include <linux/debugfs.h>
8 #include <linux/seq_file.h>
11 #include "mds_client.h"
13 #include <linux/ceph/messenger.h>
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/pagelist.h>
16 #include <linux/ceph/auth.h>
17 #include <linux/ceph/debugfs.h>
20 * A cluster of MDS (metadata server) daemons is responsible for
21 * managing the file system namespace (the directory hierarchy and
22 * inodes) and for coordinating shared access to storage. Metadata is
23 * partitioning hierarchically across a number of servers, and that
24 * partition varies over time as the cluster adjusts the distribution
25 * in order to balance load.
27 * The MDS client is primarily responsible to managing synchronous
28 * metadata requests for operations like open, unlink, and so forth.
29 * If there is a MDS failure, we find out about it when we (possibly
30 * request and) receive a new MDS map, and can resubmit affected
33 * For the most part, though, we take advantage of a lossless
34 * communications channel to the MDS, and do not need to worry about
35 * timing out or resubmitting requests.
37 * We maintain a stateful "session" with each MDS we interact with.
38 * Within each session, we sent periodic heartbeat messages to ensure
39 * any capabilities or leases we have been issues remain valid. If
40 * the session times out and goes stale, our leases and capabilities
41 * are no longer valid.
44 struct ceph_reconnect_state {
45 struct ceph_pagelist *pagelist;
49 static void __wake_requests(struct ceph_mds_client *mdsc,
50 struct list_head *head);
52 static const struct ceph_connection_operations mds_con_ops;
60 * parse individual inode info
62 static int parse_reply_info_in(void **p, void *end,
63 struct ceph_mds_reply_info_in *info,
69 *p += sizeof(struct ceph_mds_reply_inode) +
70 sizeof(*info->in->fragtree.splits) *
71 le32_to_cpu(info->in->fragtree.nsplits);
73 ceph_decode_32_safe(p, end, info->symlink_len, bad);
74 ceph_decode_need(p, end, info->symlink_len, bad);
76 *p += info->symlink_len;
78 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
79 ceph_decode_copy_safe(p, end, &info->dir_layout,
80 sizeof(info->dir_layout), bad);
82 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
84 ceph_decode_32_safe(p, end, info->xattr_len, bad);
85 ceph_decode_need(p, end, info->xattr_len, bad);
86 info->xattr_data = *p;
87 *p += info->xattr_len;
94 * parse a normal reply, which may contain a (dir+)dentry and/or a
97 static int parse_reply_info_trace(void **p, void *end,
98 struct ceph_mds_reply_info_parsed *info,
103 if (info->head->is_dentry) {
104 err = parse_reply_info_in(p, end, &info->diri, features);
108 if (unlikely(*p + sizeof(*info->dirfrag) > end))
111 *p += sizeof(*info->dirfrag) +
112 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
113 if (unlikely(*p > end))
116 ceph_decode_32_safe(p, end, info->dname_len, bad);
117 ceph_decode_need(p, end, info->dname_len, bad);
119 *p += info->dname_len;
121 *p += sizeof(*info->dlease);
124 if (info->head->is_target) {
125 err = parse_reply_info_in(p, end, &info->targeti, features);
130 if (unlikely(*p != end))
137 pr_err("problem parsing mds trace %d\n", err);
142 * parse readdir results
144 static int parse_reply_info_dir(void **p, void *end,
145 struct ceph_mds_reply_info_parsed *info,
152 if (*p + sizeof(*info->dir_dir) > end)
154 *p += sizeof(*info->dir_dir) +
155 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
159 ceph_decode_need(p, end, sizeof(num) + 2, bad);
160 num = ceph_decode_32(p);
161 info->dir_end = ceph_decode_8(p);
162 info->dir_complete = ceph_decode_8(p);
166 /* alloc large array */
168 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
169 sizeof(*info->dir_dname) +
170 sizeof(*info->dir_dname_len) +
171 sizeof(*info->dir_dlease),
173 if (info->dir_in == NULL) {
177 info->dir_dname = (void *)(info->dir_in + num);
178 info->dir_dname_len = (void *)(info->dir_dname + num);
179 info->dir_dlease = (void *)(info->dir_dname_len + num);
183 ceph_decode_need(p, end, sizeof(u32)*2, bad);
184 info->dir_dname_len[i] = ceph_decode_32(p);
185 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
186 info->dir_dname[i] = *p;
187 *p += info->dir_dname_len[i];
188 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
190 info->dir_dlease[i] = *p;
191 *p += sizeof(struct ceph_mds_reply_lease);
194 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
209 pr_err("problem parsing dir contents %d\n", err);
214 * parse fcntl F_GETLK results
216 static int parse_reply_info_filelock(void **p, void *end,
217 struct ceph_mds_reply_info_parsed *info,
220 if (*p + sizeof(*info->filelock_reply) > end)
223 info->filelock_reply = *p;
224 *p += sizeof(*info->filelock_reply);
226 if (unlikely(*p != end))
235 * parse extra results
237 static int parse_reply_info_extra(void **p, void *end,
238 struct ceph_mds_reply_info_parsed *info,
241 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
242 return parse_reply_info_filelock(p, end, info, features);
244 return parse_reply_info_dir(p, end, info, features);
248 * parse entire mds reply
250 static int parse_reply_info(struct ceph_msg *msg,
251 struct ceph_mds_reply_info_parsed *info,
258 info->head = msg->front.iov_base;
259 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
260 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
263 ceph_decode_32_safe(&p, end, len, bad);
265 ceph_decode_need(&p, end, len, bad);
266 err = parse_reply_info_trace(&p, p+len, info, features);
272 ceph_decode_32_safe(&p, end, len, bad);
274 ceph_decode_need(&p, end, len, bad);
275 err = parse_reply_info_extra(&p, p+len, info, features);
281 ceph_decode_32_safe(&p, end, len, bad);
282 info->snapblob_len = len;
293 pr_err("mds parse_reply err %d\n", err);
297 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
306 static const char *session_state_name(int s)
309 case CEPH_MDS_SESSION_NEW: return "new";
310 case CEPH_MDS_SESSION_OPENING: return "opening";
311 case CEPH_MDS_SESSION_OPEN: return "open";
312 case CEPH_MDS_SESSION_HUNG: return "hung";
313 case CEPH_MDS_SESSION_CLOSING: return "closing";
314 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
315 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
316 default: return "???";
320 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
322 if (atomic_inc_not_zero(&s->s_ref)) {
323 dout("mdsc get_session %p %d -> %d\n", s,
324 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
327 dout("mdsc get_session %p 0 -- FAIL", s);
332 void ceph_put_mds_session(struct ceph_mds_session *s)
334 dout("mdsc put_session %p %d -> %d\n", s,
335 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
336 if (atomic_dec_and_test(&s->s_ref)) {
337 if (s->s_auth.authorizer)
338 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
339 s->s_mdsc->fsc->client->monc.auth,
340 s->s_auth.authorizer);
346 * called under mdsc->mutex
348 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
351 struct ceph_mds_session *session;
353 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
355 session = mdsc->sessions[mds];
356 dout("lookup_mds_session %p %d\n", session,
357 atomic_read(&session->s_ref));
358 get_session(session);
362 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
364 if (mds >= mdsc->max_sessions)
366 return mdsc->sessions[mds];
369 static int __verify_registered_session(struct ceph_mds_client *mdsc,
370 struct ceph_mds_session *s)
372 if (s->s_mds >= mdsc->max_sessions ||
373 mdsc->sessions[s->s_mds] != s)
379 * create+register a new session for given mds.
380 * called under mdsc->mutex.
382 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
385 struct ceph_mds_session *s;
387 s = kzalloc(sizeof(*s), GFP_NOFS);
389 return ERR_PTR(-ENOMEM);
392 s->s_state = CEPH_MDS_SESSION_NEW;
395 mutex_init(&s->s_mutex);
397 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
399 spin_lock_init(&s->s_gen_ttl_lock);
401 s->s_cap_ttl = jiffies - 1;
403 spin_lock_init(&s->s_cap_lock);
404 s->s_renew_requested = 0;
406 INIT_LIST_HEAD(&s->s_caps);
409 atomic_set(&s->s_ref, 1);
410 INIT_LIST_HEAD(&s->s_waiting);
411 INIT_LIST_HEAD(&s->s_unsafe);
412 s->s_num_cap_releases = 0;
413 s->s_cap_iterator = NULL;
414 INIT_LIST_HEAD(&s->s_cap_releases);
415 INIT_LIST_HEAD(&s->s_cap_releases_done);
416 INIT_LIST_HEAD(&s->s_cap_flushing);
417 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
419 dout("register_session mds%d\n", mds);
420 if (mds >= mdsc->max_sessions) {
421 int newmax = 1 << get_count_order(mds+1);
422 struct ceph_mds_session **sa;
424 dout("register_session realloc to %d\n", newmax);
425 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
428 if (mdsc->sessions) {
429 memcpy(sa, mdsc->sessions,
430 mdsc->max_sessions * sizeof(void *));
431 kfree(mdsc->sessions);
434 mdsc->max_sessions = newmax;
436 mdsc->sessions[mds] = s;
437 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
439 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
440 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
446 return ERR_PTR(-ENOMEM);
450 * called under mdsc->mutex
452 static void __unregister_session(struct ceph_mds_client *mdsc,
453 struct ceph_mds_session *s)
455 dout("__unregister_session mds%d %p\n", s->s_mds, s);
456 BUG_ON(mdsc->sessions[s->s_mds] != s);
457 mdsc->sessions[s->s_mds] = NULL;
458 ceph_con_close(&s->s_con);
459 ceph_put_mds_session(s);
463 * drop session refs in request.
465 * should be last request ref, or hold mdsc->mutex
467 static void put_request_session(struct ceph_mds_request *req)
469 if (req->r_session) {
470 ceph_put_mds_session(req->r_session);
471 req->r_session = NULL;
475 void ceph_mdsc_release_request(struct kref *kref)
477 struct ceph_mds_request *req = container_of(kref,
478 struct ceph_mds_request,
481 ceph_msg_put(req->r_request);
483 ceph_msg_put(req->r_reply);
484 destroy_reply_info(&req->r_reply_info);
487 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
490 if (req->r_locked_dir)
491 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
492 if (req->r_target_inode)
493 iput(req->r_target_inode);
496 if (req->r_old_dentry) {
498 * track (and drop pins for) r_old_dentry_dir
499 * separately, since r_old_dentry's d_parent may have
500 * changed between the dir mutex being dropped and
501 * this request being freed.
503 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
505 dput(req->r_old_dentry);
506 iput(req->r_old_dentry_dir);
510 put_request_session(req);
511 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
516 * lookup session, bump ref if found.
518 * called under mdsc->mutex.
520 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
523 struct ceph_mds_request *req;
524 struct rb_node *n = mdsc->request_tree.rb_node;
527 req = rb_entry(n, struct ceph_mds_request, r_node);
528 if (tid < req->r_tid)
530 else if (tid > req->r_tid)
533 ceph_mdsc_get_request(req);
540 static void __insert_request(struct ceph_mds_client *mdsc,
541 struct ceph_mds_request *new)
543 struct rb_node **p = &mdsc->request_tree.rb_node;
544 struct rb_node *parent = NULL;
545 struct ceph_mds_request *req = NULL;
549 req = rb_entry(parent, struct ceph_mds_request, r_node);
550 if (new->r_tid < req->r_tid)
552 else if (new->r_tid > req->r_tid)
558 rb_link_node(&new->r_node, parent, p);
559 rb_insert_color(&new->r_node, &mdsc->request_tree);
563 * Register an in-flight request, and assign a tid. Link to directory
564 * are modifying (if any).
566 * Called under mdsc->mutex.
568 static void __register_request(struct ceph_mds_client *mdsc,
569 struct ceph_mds_request *req,
572 req->r_tid = ++mdsc->last_tid;
574 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
576 dout("__register_request %p tid %lld\n", req, req->r_tid);
577 ceph_mdsc_get_request(req);
578 __insert_request(mdsc, req);
580 req->r_uid = current_fsuid();
581 req->r_gid = current_fsgid();
584 struct ceph_inode_info *ci = ceph_inode(dir);
587 spin_lock(&ci->i_unsafe_lock);
588 req->r_unsafe_dir = dir;
589 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
590 spin_unlock(&ci->i_unsafe_lock);
594 static void __unregister_request(struct ceph_mds_client *mdsc,
595 struct ceph_mds_request *req)
597 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
598 rb_erase(&req->r_node, &mdsc->request_tree);
599 RB_CLEAR_NODE(&req->r_node);
601 if (req->r_unsafe_dir) {
602 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
604 spin_lock(&ci->i_unsafe_lock);
605 list_del_init(&req->r_unsafe_dir_item);
606 spin_unlock(&ci->i_unsafe_lock);
608 iput(req->r_unsafe_dir);
609 req->r_unsafe_dir = NULL;
612 ceph_mdsc_put_request(req);
616 * Choose mds to send request to next. If there is a hint set in the
617 * request (e.g., due to a prior forward hint from the mds), use that.
618 * Otherwise, consult frag tree and/or caps to identify the
619 * appropriate mds. If all else fails, choose randomly.
621 * Called under mdsc->mutex.
623 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
626 * we don't need to worry about protecting the d_parent access
627 * here because we never renaming inside the snapped namespace
628 * except to resplice to another snapdir, and either the old or new
629 * result is a valid result.
631 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
632 dentry = dentry->d_parent;
636 static int __choose_mds(struct ceph_mds_client *mdsc,
637 struct ceph_mds_request *req)
640 struct ceph_inode_info *ci;
641 struct ceph_cap *cap;
642 int mode = req->r_direct_mode;
644 u32 hash = req->r_direct_hash;
645 bool is_hash = req->r_direct_is_hash;
648 * is there a specific mds we should try? ignore hint if we have
649 * no session and the mds is not up (active or recovering).
651 if (req->r_resend_mds >= 0 &&
652 (__have_session(mdsc, req->r_resend_mds) ||
653 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
654 dout("choose_mds using resend_mds mds%d\n",
656 return req->r_resend_mds;
659 if (mode == USE_RANDOM_MDS)
664 inode = req->r_inode;
665 } else if (req->r_dentry) {
666 /* ignore race with rename; old or new d_parent is okay */
667 struct dentry *parent = req->r_dentry->d_parent;
668 struct inode *dir = parent->d_inode;
670 if (dir->i_sb != mdsc->fsc->sb) {
672 inode = req->r_dentry->d_inode;
673 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
674 /* direct snapped/virtual snapdir requests
675 * based on parent dir inode */
676 struct dentry *dn = get_nonsnap_parent(parent);
678 dout("__choose_mds using nonsnap parent %p\n", inode);
679 } else if (req->r_dentry->d_inode) {
681 inode = req->r_dentry->d_inode;
685 hash = ceph_dentry_hash(dir, req->r_dentry);
690 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
694 ci = ceph_inode(inode);
696 if (is_hash && S_ISDIR(inode->i_mode)) {
697 struct ceph_inode_frag frag;
700 ceph_choose_frag(ci, hash, &frag, &found);
702 if (mode == USE_ANY_MDS && frag.ndist > 0) {
705 /* choose a random replica */
706 get_random_bytes(&r, 1);
709 dout("choose_mds %p %llx.%llx "
710 "frag %u mds%d (%d/%d)\n",
711 inode, ceph_vinop(inode),
714 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
715 CEPH_MDS_STATE_ACTIVE)
719 /* since this file/dir wasn't known to be
720 * replicated, then we want to look for the
721 * authoritative mds. */
724 /* choose auth mds */
726 dout("choose_mds %p %llx.%llx "
727 "frag %u mds%d (auth)\n",
728 inode, ceph_vinop(inode), frag.frag, mds);
729 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
730 CEPH_MDS_STATE_ACTIVE)
736 spin_lock(&ci->i_ceph_lock);
738 if (mode == USE_AUTH_MDS)
739 cap = ci->i_auth_cap;
740 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
741 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
743 spin_unlock(&ci->i_ceph_lock);
746 mds = cap->session->s_mds;
747 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
748 inode, ceph_vinop(inode), mds,
749 cap == ci->i_auth_cap ? "auth " : "", cap);
750 spin_unlock(&ci->i_ceph_lock);
754 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
755 dout("choose_mds chose random mds%d\n", mds);
763 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
765 struct ceph_msg *msg;
766 struct ceph_mds_session_head *h;
768 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
771 pr_err("create_session_msg ENOMEM creating msg\n");
774 h = msg->front.iov_base;
775 h->op = cpu_to_le32(op);
776 h->seq = cpu_to_le64(seq);
781 * send session open request.
783 * called under mdsc->mutex
785 static int __open_session(struct ceph_mds_client *mdsc,
786 struct ceph_mds_session *session)
788 struct ceph_msg *msg;
790 int mds = session->s_mds;
792 /* wait for mds to go active? */
793 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
794 dout("open_session to mds%d (%s)\n", mds,
795 ceph_mds_state_name(mstate));
796 session->s_state = CEPH_MDS_SESSION_OPENING;
797 session->s_renew_requested = jiffies;
799 /* send connect message */
800 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
803 ceph_con_send(&session->s_con, msg);
808 * open sessions for any export targets for the given mds
810 * called under mdsc->mutex
812 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
813 struct ceph_mds_session *session)
815 struct ceph_mds_info *mi;
816 struct ceph_mds_session *ts;
817 int i, mds = session->s_mds;
820 if (mds >= mdsc->mdsmap->m_max_mds)
822 mi = &mdsc->mdsmap->m_info[mds];
823 dout("open_export_target_sessions for mds%d (%d targets)\n",
824 session->s_mds, mi->num_export_targets);
826 for (i = 0; i < mi->num_export_targets; i++) {
827 target = mi->export_targets[i];
828 ts = __ceph_lookup_mds_session(mdsc, target);
830 ts = register_session(mdsc, target);
834 if (session->s_state == CEPH_MDS_SESSION_NEW ||
835 session->s_state == CEPH_MDS_SESSION_CLOSING)
836 __open_session(mdsc, session);
838 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
839 i, ts, session_state_name(ts->s_state));
840 ceph_put_mds_session(ts);
844 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
845 struct ceph_mds_session *session)
847 mutex_lock(&mdsc->mutex);
848 __open_export_target_sessions(mdsc, session);
849 mutex_unlock(&mdsc->mutex);
857 * Free preallocated cap messages assigned to this session
859 static void cleanup_cap_releases(struct ceph_mds_session *session)
861 struct ceph_msg *msg;
863 spin_lock(&session->s_cap_lock);
864 while (!list_empty(&session->s_cap_releases)) {
865 msg = list_first_entry(&session->s_cap_releases,
866 struct ceph_msg, list_head);
867 list_del_init(&msg->list_head);
870 while (!list_empty(&session->s_cap_releases_done)) {
871 msg = list_first_entry(&session->s_cap_releases_done,
872 struct ceph_msg, list_head);
873 list_del_init(&msg->list_head);
876 spin_unlock(&session->s_cap_lock);
880 * Helper to safely iterate over all caps associated with a session, with
881 * special care taken to handle a racing __ceph_remove_cap().
883 * Caller must hold session s_mutex.
885 static int iterate_session_caps(struct ceph_mds_session *session,
886 int (*cb)(struct inode *, struct ceph_cap *,
890 struct ceph_cap *cap;
891 struct inode *inode, *last_inode = NULL;
892 struct ceph_cap *old_cap = NULL;
895 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
896 spin_lock(&session->s_cap_lock);
897 p = session->s_caps.next;
898 while (p != &session->s_caps) {
899 cap = list_entry(p, struct ceph_cap, session_caps);
900 inode = igrab(&cap->ci->vfs_inode);
905 session->s_cap_iterator = cap;
906 spin_unlock(&session->s_cap_lock);
913 ceph_put_cap(session->s_mdsc, old_cap);
917 ret = cb(inode, cap, arg);
920 spin_lock(&session->s_cap_lock);
922 if (cap->ci == NULL) {
923 dout("iterate_session_caps finishing cap %p removal\n",
925 BUG_ON(cap->session != session);
926 list_del_init(&cap->session_caps);
927 session->s_nr_caps--;
929 old_cap = cap; /* put_cap it w/o locks held */
936 session->s_cap_iterator = NULL;
937 spin_unlock(&session->s_cap_lock);
942 ceph_put_cap(session->s_mdsc, old_cap);
947 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
950 struct ceph_inode_info *ci = ceph_inode(inode);
953 dout("removing cap %p, ci is %p, inode is %p\n",
954 cap, ci, &ci->vfs_inode);
955 spin_lock(&ci->i_ceph_lock);
956 __ceph_remove_cap(cap);
957 if (!__ceph_is_any_real_caps(ci)) {
958 struct ceph_mds_client *mdsc =
959 ceph_sb_to_client(inode->i_sb)->mdsc;
961 spin_lock(&mdsc->cap_dirty_lock);
962 if (!list_empty(&ci->i_dirty_item)) {
963 pr_info(" dropping dirty %s state for %p %lld\n",
964 ceph_cap_string(ci->i_dirty_caps),
965 inode, ceph_ino(inode));
966 ci->i_dirty_caps = 0;
967 list_del_init(&ci->i_dirty_item);
970 if (!list_empty(&ci->i_flushing_item)) {
971 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
972 ceph_cap_string(ci->i_flushing_caps),
973 inode, ceph_ino(inode));
974 ci->i_flushing_caps = 0;
975 list_del_init(&ci->i_flushing_item);
976 mdsc->num_cap_flushing--;
979 if (drop && ci->i_wrbuffer_ref) {
980 pr_info(" dropping dirty data for %p %lld\n",
981 inode, ceph_ino(inode));
982 ci->i_wrbuffer_ref = 0;
983 ci->i_wrbuffer_ref_head = 0;
986 spin_unlock(&mdsc->cap_dirty_lock);
988 spin_unlock(&ci->i_ceph_lock);
995 * caller must hold session s_mutex
997 static void remove_session_caps(struct ceph_mds_session *session)
999 dout("remove_session_caps on %p\n", session);
1000 iterate_session_caps(session, remove_session_caps_cb, NULL);
1001 BUG_ON(session->s_nr_caps > 0);
1002 BUG_ON(!list_empty(&session->s_cap_flushing));
1003 cleanup_cap_releases(session);
1007 * wake up any threads waiting on this session's caps. if the cap is
1008 * old (didn't get renewed on the client reconnect), remove it now.
1010 * caller must hold s_mutex.
1012 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1015 struct ceph_inode_info *ci = ceph_inode(inode);
1017 wake_up_all(&ci->i_cap_wq);
1019 spin_lock(&ci->i_ceph_lock);
1020 ci->i_wanted_max_size = 0;
1021 ci->i_requested_max_size = 0;
1022 spin_unlock(&ci->i_ceph_lock);
1027 static void wake_up_session_caps(struct ceph_mds_session *session,
1030 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1031 iterate_session_caps(session, wake_up_session_cb,
1032 (void *)(unsigned long)reconnect);
1036 * Send periodic message to MDS renewing all currently held caps. The
1037 * ack will reset the expiration for all caps from this session.
1039 * caller holds s_mutex
1041 static int send_renew_caps(struct ceph_mds_client *mdsc,
1042 struct ceph_mds_session *session)
1044 struct ceph_msg *msg;
1047 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1048 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1049 pr_info("mds%d caps stale\n", session->s_mds);
1050 session->s_renew_requested = jiffies;
1052 /* do not try to renew caps until a recovering mds has reconnected
1053 * with its clients. */
1054 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1055 if (state < CEPH_MDS_STATE_RECONNECT) {
1056 dout("send_renew_caps ignoring mds%d (%s)\n",
1057 session->s_mds, ceph_mds_state_name(state));
1061 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1062 ceph_mds_state_name(state));
1063 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1064 ++session->s_renew_seq);
1067 ceph_con_send(&session->s_con, msg);
1072 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1074 * Called under session->s_mutex
1076 static void renewed_caps(struct ceph_mds_client *mdsc,
1077 struct ceph_mds_session *session, int is_renew)
1082 spin_lock(&session->s_cap_lock);
1083 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1085 session->s_cap_ttl = session->s_renew_requested +
1086 mdsc->mdsmap->m_session_timeout*HZ;
1089 if (time_before(jiffies, session->s_cap_ttl)) {
1090 pr_info("mds%d caps renewed\n", session->s_mds);
1093 pr_info("mds%d caps still stale\n", session->s_mds);
1096 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1097 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1098 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1099 spin_unlock(&session->s_cap_lock);
1102 wake_up_session_caps(session, 0);
1106 * send a session close request
1108 static int request_close_session(struct ceph_mds_client *mdsc,
1109 struct ceph_mds_session *session)
1111 struct ceph_msg *msg;
1113 dout("request_close_session mds%d state %s seq %lld\n",
1114 session->s_mds, session_state_name(session->s_state),
1116 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1119 ceph_con_send(&session->s_con, msg);
1124 * Called with s_mutex held.
1126 static int __close_session(struct ceph_mds_client *mdsc,
1127 struct ceph_mds_session *session)
1129 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1131 session->s_state = CEPH_MDS_SESSION_CLOSING;
1132 return request_close_session(mdsc, session);
1136 * Trim old(er) caps.
1138 * Because we can't cache an inode without one or more caps, we do
1139 * this indirectly: if a cap is unused, we prune its aliases, at which
1140 * point the inode will hopefully get dropped to.
1142 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1143 * memory pressure from the MDS, though, so it needn't be perfect.
1145 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1147 struct ceph_mds_session *session = arg;
1148 struct ceph_inode_info *ci = ceph_inode(inode);
1149 int used, oissued, mine;
1151 if (session->s_trim_caps <= 0)
1154 spin_lock(&ci->i_ceph_lock);
1155 mine = cap->issued | cap->implemented;
1156 used = __ceph_caps_used(ci);
1157 oissued = __ceph_caps_issued_other(ci, cap);
1159 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1160 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1161 ceph_cap_string(used));
1162 if (ci->i_dirty_caps)
1163 goto out; /* dirty caps */
1164 if ((used & ~oissued) & mine)
1165 goto out; /* we need these caps */
1167 session->s_trim_caps--;
1169 /* we aren't the only cap.. just remove us */
1170 __ceph_remove_cap(cap);
1172 /* try to drop referring dentries */
1173 spin_unlock(&ci->i_ceph_lock);
1174 d_prune_aliases(inode);
1175 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1176 inode, cap, atomic_read(&inode->i_count));
1181 spin_unlock(&ci->i_ceph_lock);
1186 * Trim session cap count down to some max number.
1188 static int trim_caps(struct ceph_mds_client *mdsc,
1189 struct ceph_mds_session *session,
1192 int trim_caps = session->s_nr_caps - max_caps;
1194 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1195 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1196 if (trim_caps > 0) {
1197 session->s_trim_caps = trim_caps;
1198 iterate_session_caps(session, trim_caps_cb, session);
1199 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1200 session->s_mds, session->s_nr_caps, max_caps,
1201 trim_caps - session->s_trim_caps);
1202 session->s_trim_caps = 0;
1208 * Allocate cap_release messages. If there is a partially full message
1209 * in the queue, try to allocate enough to cover it's remainder, so that
1210 * we can send it immediately.
1212 * Called under s_mutex.
1214 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1215 struct ceph_mds_session *session)
1217 struct ceph_msg *msg, *partial = NULL;
1218 struct ceph_mds_cap_release *head;
1220 int extra = mdsc->fsc->mount_options->cap_release_safety;
1223 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1226 spin_lock(&session->s_cap_lock);
1228 if (!list_empty(&session->s_cap_releases)) {
1229 msg = list_first_entry(&session->s_cap_releases,
1232 head = msg->front.iov_base;
1233 num = le32_to_cpu(head->num);
1235 dout(" partial %p with (%d/%d)\n", msg, num,
1236 (int)CEPH_CAPS_PER_RELEASE);
1237 extra += CEPH_CAPS_PER_RELEASE - num;
1241 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1242 spin_unlock(&session->s_cap_lock);
1243 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1247 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1248 (int)msg->front.iov_len);
1249 head = msg->front.iov_base;
1250 head->num = cpu_to_le32(0);
1251 msg->front.iov_len = sizeof(*head);
1252 spin_lock(&session->s_cap_lock);
1253 list_add(&msg->list_head, &session->s_cap_releases);
1254 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1258 head = partial->front.iov_base;
1259 num = le32_to_cpu(head->num);
1260 dout(" queueing partial %p with %d/%d\n", partial, num,
1261 (int)CEPH_CAPS_PER_RELEASE);
1262 list_move_tail(&partial->list_head,
1263 &session->s_cap_releases_done);
1264 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1267 spin_unlock(&session->s_cap_lock);
1273 * flush all dirty inode data to disk.
1275 * returns true if we've flushed through want_flush_seq
1277 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1281 dout("check_cap_flush want %lld\n", want_flush_seq);
1282 mutex_lock(&mdsc->mutex);
1283 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1284 struct ceph_mds_session *session = mdsc->sessions[mds];
1288 get_session(session);
1289 mutex_unlock(&mdsc->mutex);
1291 mutex_lock(&session->s_mutex);
1292 if (!list_empty(&session->s_cap_flushing)) {
1293 struct ceph_inode_info *ci =
1294 list_entry(session->s_cap_flushing.next,
1295 struct ceph_inode_info,
1297 struct inode *inode = &ci->vfs_inode;
1299 spin_lock(&ci->i_ceph_lock);
1300 if (ci->i_cap_flush_seq <= want_flush_seq) {
1301 dout("check_cap_flush still flushing %p "
1302 "seq %lld <= %lld to mds%d\n", inode,
1303 ci->i_cap_flush_seq, want_flush_seq,
1307 spin_unlock(&ci->i_ceph_lock);
1309 mutex_unlock(&session->s_mutex);
1310 ceph_put_mds_session(session);
1314 mutex_lock(&mdsc->mutex);
1317 mutex_unlock(&mdsc->mutex);
1318 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1323 * called under s_mutex
1325 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1326 struct ceph_mds_session *session)
1328 struct ceph_msg *msg;
1330 dout("send_cap_releases mds%d\n", session->s_mds);
1331 spin_lock(&session->s_cap_lock);
1332 while (!list_empty(&session->s_cap_releases_done)) {
1333 msg = list_first_entry(&session->s_cap_releases_done,
1334 struct ceph_msg, list_head);
1335 list_del_init(&msg->list_head);
1336 spin_unlock(&session->s_cap_lock);
1337 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1338 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1339 ceph_con_send(&session->s_con, msg);
1340 spin_lock(&session->s_cap_lock);
1342 spin_unlock(&session->s_cap_lock);
1345 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1346 struct ceph_mds_session *session)
1348 struct ceph_msg *msg;
1349 struct ceph_mds_cap_release *head;
1352 dout("discard_cap_releases mds%d\n", session->s_mds);
1353 spin_lock(&session->s_cap_lock);
1355 /* zero out the in-progress message */
1356 msg = list_first_entry(&session->s_cap_releases,
1357 struct ceph_msg, list_head);
1358 head = msg->front.iov_base;
1359 num = le32_to_cpu(head->num);
1360 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1361 head->num = cpu_to_le32(0);
1362 session->s_num_cap_releases += num;
1364 /* requeue completed messages */
1365 while (!list_empty(&session->s_cap_releases_done)) {
1366 msg = list_first_entry(&session->s_cap_releases_done,
1367 struct ceph_msg, list_head);
1368 list_del_init(&msg->list_head);
1370 head = msg->front.iov_base;
1371 num = le32_to_cpu(head->num);
1372 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1374 session->s_num_cap_releases += num;
1375 head->num = cpu_to_le32(0);
1376 msg->front.iov_len = sizeof(*head);
1377 list_add(&msg->list_head, &session->s_cap_releases);
1380 spin_unlock(&session->s_cap_lock);
1388 * Create an mds request.
1390 struct ceph_mds_request *
1391 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1393 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1396 return ERR_PTR(-ENOMEM);
1398 mutex_init(&req->r_fill_mutex);
1400 req->r_started = jiffies;
1401 req->r_resend_mds = -1;
1402 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1404 kref_init(&req->r_kref);
1405 INIT_LIST_HEAD(&req->r_wait);
1406 init_completion(&req->r_completion);
1407 init_completion(&req->r_safe_completion);
1408 INIT_LIST_HEAD(&req->r_unsafe_item);
1411 req->r_direct_mode = mode;
1416 * return oldest (lowest) request, tid in request tree, 0 if none.
1418 * called under mdsc->mutex.
1420 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1422 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1424 return rb_entry(rb_first(&mdsc->request_tree),
1425 struct ceph_mds_request, r_node);
1428 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1430 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1438 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1439 * on build_path_from_dentry in fs/cifs/dir.c.
1441 * If @stop_on_nosnap, generate path relative to the first non-snapped
1444 * Encode hidden .snap dirs as a double /, i.e.
1445 * foo/.snap/bar -> foo//bar
1447 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1450 struct dentry *temp;
1456 return ERR_PTR(-EINVAL);
1460 seq = read_seqbegin(&rename_lock);
1462 for (temp = dentry; !IS_ROOT(temp);) {
1463 struct inode *inode = temp->d_inode;
1464 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1465 len++; /* slash only */
1466 else if (stop_on_nosnap && inode &&
1467 ceph_snap(inode) == CEPH_NOSNAP)
1470 len += 1 + temp->d_name.len;
1471 temp = temp->d_parent;
1474 pr_err("build_path corrupt dentry %p\n", dentry);
1475 return ERR_PTR(-EINVAL);
1480 len--; /* no leading '/' */
1482 path = kmalloc(len+1, GFP_NOFS);
1484 return ERR_PTR(-ENOMEM);
1486 path[pos] = 0; /* trailing null */
1488 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1489 struct inode *inode;
1491 spin_lock(&temp->d_lock);
1492 inode = temp->d_inode;
1493 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1494 dout("build_path path+%d: %p SNAPDIR\n",
1496 } else if (stop_on_nosnap && inode &&
1497 ceph_snap(inode) == CEPH_NOSNAP) {
1498 spin_unlock(&temp->d_lock);
1501 pos -= temp->d_name.len;
1503 spin_unlock(&temp->d_lock);
1506 strncpy(path + pos, temp->d_name.name,
1509 spin_unlock(&temp->d_lock);
1512 temp = temp->d_parent;
1515 pr_err("build_path corrupt dentry\n");
1517 return ERR_PTR(-EINVAL);
1521 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1522 pr_err("build_path did not end path lookup where "
1523 "expected, namelen is %d, pos is %d\n", len, pos);
1524 /* presumably this is only possible if racing with a
1525 rename of one of the parent directories (we can not
1526 lock the dentries above us to prevent this, but
1527 retrying should be harmless) */
1532 *base = ceph_ino(temp->d_inode);
1534 dout("build_path on %p %d built %llx '%.*s'\n",
1535 dentry, dentry->d_count, *base, len, path);
1539 static int build_dentry_path(struct dentry *dentry,
1540 const char **ppath, int *ppathlen, u64 *pino,
1545 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1546 *pino = ceph_ino(dentry->d_parent->d_inode);
1547 *ppath = dentry->d_name.name;
1548 *ppathlen = dentry->d_name.len;
1551 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1553 return PTR_ERR(path);
1559 static int build_inode_path(struct inode *inode,
1560 const char **ppath, int *ppathlen, u64 *pino,
1563 struct dentry *dentry;
1566 if (ceph_snap(inode) == CEPH_NOSNAP) {
1567 *pino = ceph_ino(inode);
1571 dentry = d_find_alias(inode);
1572 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1575 return PTR_ERR(path);
1582 * request arguments may be specified via an inode *, a dentry *, or
1583 * an explicit ino+path.
1585 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1586 const char *rpath, u64 rino,
1587 const char **ppath, int *pathlen,
1588 u64 *ino, int *freepath)
1593 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1594 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1596 } else if (rdentry) {
1597 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1598 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1600 } else if (rpath || rino) {
1603 *pathlen = strlen(rpath);
1604 dout(" path %.*s\n", *pathlen, rpath);
1611 * called under mdsc->mutex
1613 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1614 struct ceph_mds_request *req,
1617 struct ceph_msg *msg;
1618 struct ceph_mds_request_head *head;
1619 const char *path1 = NULL;
1620 const char *path2 = NULL;
1621 u64 ino1 = 0, ino2 = 0;
1622 int pathlen1 = 0, pathlen2 = 0;
1623 int freepath1 = 0, freepath2 = 0;
1629 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1630 req->r_path1, req->r_ino1.ino,
1631 &path1, &pathlen1, &ino1, &freepath1);
1637 ret = set_request_path_attr(NULL, req->r_old_dentry,
1638 req->r_path2, req->r_ino2.ino,
1639 &path2, &pathlen2, &ino2, &freepath2);
1645 len = sizeof(*head) +
1646 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1648 /* calculate (max) length for cap releases */
1649 len += sizeof(struct ceph_mds_request_release) *
1650 (!!req->r_inode_drop + !!req->r_dentry_drop +
1651 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1652 if (req->r_dentry_drop)
1653 len += req->r_dentry->d_name.len;
1654 if (req->r_old_dentry_drop)
1655 len += req->r_old_dentry->d_name.len;
1657 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1659 msg = ERR_PTR(-ENOMEM);
1663 msg->hdr.tid = cpu_to_le64(req->r_tid);
1665 head = msg->front.iov_base;
1666 p = msg->front.iov_base + sizeof(*head);
1667 end = msg->front.iov_base + msg->front.iov_len;
1669 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1670 head->op = cpu_to_le32(req->r_op);
1671 head->caller_uid = cpu_to_le32(req->r_uid);
1672 head->caller_gid = cpu_to_le32(req->r_gid);
1673 head->args = req->r_args;
1675 ceph_encode_filepath(&p, end, ino1, path1);
1676 ceph_encode_filepath(&p, end, ino2, path2);
1678 /* make note of release offset, in case we need to replay */
1679 req->r_request_release_offset = p - msg->front.iov_base;
1683 if (req->r_inode_drop)
1684 releases += ceph_encode_inode_release(&p,
1685 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1686 mds, req->r_inode_drop, req->r_inode_unless, 0);
1687 if (req->r_dentry_drop)
1688 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1689 mds, req->r_dentry_drop, req->r_dentry_unless);
1690 if (req->r_old_dentry_drop)
1691 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1692 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1693 if (req->r_old_inode_drop)
1694 releases += ceph_encode_inode_release(&p,
1695 req->r_old_dentry->d_inode,
1696 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1697 head->num_releases = cpu_to_le16(releases);
1700 msg->front.iov_len = p - msg->front.iov_base;
1701 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1703 msg->pages = req->r_pages;
1704 msg->nr_pages = req->r_num_pages;
1705 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1706 msg->hdr.data_off = cpu_to_le16(0);
1710 kfree((char *)path2);
1713 kfree((char *)path1);
1719 * called under mdsc->mutex if error, under no mutex if
1722 static void complete_request(struct ceph_mds_client *mdsc,
1723 struct ceph_mds_request *req)
1725 if (req->r_callback)
1726 req->r_callback(mdsc, req);
1728 complete_all(&req->r_completion);
1732 * called under mdsc->mutex
1734 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1735 struct ceph_mds_request *req,
1738 struct ceph_mds_request_head *rhead;
1739 struct ceph_msg *msg;
1744 struct ceph_cap *cap =
1745 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1748 req->r_sent_on_mseq = cap->mseq;
1750 req->r_sent_on_mseq = -1;
1752 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1753 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1755 if (req->r_got_unsafe) {
1757 * Replay. Do not regenerate message (and rebuild
1758 * paths, etc.); just use the original message.
1759 * Rebuilding paths will break for renames because
1760 * d_move mangles the src name.
1762 msg = req->r_request;
1763 rhead = msg->front.iov_base;
1765 flags = le32_to_cpu(rhead->flags);
1766 flags |= CEPH_MDS_FLAG_REPLAY;
1767 rhead->flags = cpu_to_le32(flags);
1769 if (req->r_target_inode)
1770 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1772 rhead->num_retry = req->r_attempts - 1;
1774 /* remove cap/dentry releases from message */
1775 rhead->num_releases = 0;
1776 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1777 msg->front.iov_len = req->r_request_release_offset;
1781 if (req->r_request) {
1782 ceph_msg_put(req->r_request);
1783 req->r_request = NULL;
1785 msg = create_request_message(mdsc, req, mds);
1787 req->r_err = PTR_ERR(msg);
1788 complete_request(mdsc, req);
1789 return PTR_ERR(msg);
1791 req->r_request = msg;
1793 rhead = msg->front.iov_base;
1794 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1795 if (req->r_got_unsafe)
1796 flags |= CEPH_MDS_FLAG_REPLAY;
1797 if (req->r_locked_dir)
1798 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1799 rhead->flags = cpu_to_le32(flags);
1800 rhead->num_fwd = req->r_num_fwd;
1801 rhead->num_retry = req->r_attempts - 1;
1804 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1809 * send request, or put it on the appropriate wait list.
1811 static int __do_request(struct ceph_mds_client *mdsc,
1812 struct ceph_mds_request *req)
1814 struct ceph_mds_session *session = NULL;
1818 if (req->r_err || req->r_got_result)
1821 if (req->r_timeout &&
1822 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1823 dout("do_request timed out\n");
1828 put_request_session(req);
1830 mds = __choose_mds(mdsc, req);
1832 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1833 dout("do_request no mds or not active, waiting for map\n");
1834 list_add(&req->r_wait, &mdsc->waiting_for_map);
1838 /* get, open session */
1839 session = __ceph_lookup_mds_session(mdsc, mds);
1841 session = register_session(mdsc, mds);
1842 if (IS_ERR(session)) {
1843 err = PTR_ERR(session);
1847 req->r_session = get_session(session);
1849 dout("do_request mds%d session %p state %s\n", mds, session,
1850 session_state_name(session->s_state));
1851 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1852 session->s_state != CEPH_MDS_SESSION_HUNG) {
1853 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1854 session->s_state == CEPH_MDS_SESSION_CLOSING)
1855 __open_session(mdsc, session);
1856 list_add(&req->r_wait, &session->s_waiting);
1861 req->r_resend_mds = -1; /* forget any previous mds hint */
1863 if (req->r_request_started == 0) /* note request start time */
1864 req->r_request_started = jiffies;
1866 err = __prepare_send_request(mdsc, req, mds);
1868 ceph_msg_get(req->r_request);
1869 ceph_con_send(&session->s_con, req->r_request);
1873 ceph_put_mds_session(session);
1879 complete_request(mdsc, req);
1884 * called under mdsc->mutex
1886 static void __wake_requests(struct ceph_mds_client *mdsc,
1887 struct list_head *head)
1889 struct ceph_mds_request *req, *nreq;
1891 list_for_each_entry_safe(req, nreq, head, r_wait) {
1892 list_del_init(&req->r_wait);
1893 __do_request(mdsc, req);
1898 * Wake up threads with requests pending for @mds, so that they can
1899 * resubmit their requests to a possibly different mds.
1901 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1903 struct ceph_mds_request *req;
1906 dout("kick_requests mds%d\n", mds);
1907 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1908 req = rb_entry(p, struct ceph_mds_request, r_node);
1909 if (req->r_got_unsafe)
1911 if (req->r_session &&
1912 req->r_session->s_mds == mds) {
1913 dout(" kicking tid %llu\n", req->r_tid);
1914 __do_request(mdsc, req);
1919 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1920 struct ceph_mds_request *req)
1922 dout("submit_request on %p\n", req);
1923 mutex_lock(&mdsc->mutex);
1924 __register_request(mdsc, req, NULL);
1925 __do_request(mdsc, req);
1926 mutex_unlock(&mdsc->mutex);
1930 * Synchrously perform an mds request. Take care of all of the
1931 * session setup, forwarding, retry details.
1933 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1935 struct ceph_mds_request *req)
1939 dout("do_request on %p\n", req);
1941 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1943 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1944 if (req->r_locked_dir)
1945 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1946 if (req->r_old_dentry)
1947 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1951 mutex_lock(&mdsc->mutex);
1952 __register_request(mdsc, req, dir);
1953 __do_request(mdsc, req);
1957 __unregister_request(mdsc, req);
1958 dout("do_request early error %d\n", err);
1963 mutex_unlock(&mdsc->mutex);
1964 dout("do_request waiting\n");
1965 if (req->r_timeout) {
1966 err = (long)wait_for_completion_killable_timeout(
1967 &req->r_completion, req->r_timeout);
1971 err = wait_for_completion_killable(&req->r_completion);
1973 dout("do_request waited, got %d\n", err);
1974 mutex_lock(&mdsc->mutex);
1976 /* only abort if we didn't race with a real reply */
1977 if (req->r_got_result) {
1978 err = le32_to_cpu(req->r_reply_info.head->result);
1979 } else if (err < 0) {
1980 dout("aborted request %lld with %d\n", req->r_tid, err);
1983 * ensure we aren't running concurrently with
1984 * ceph_fill_trace or ceph_readdir_prepopulate, which
1985 * rely on locks (dir mutex) held by our caller.
1987 mutex_lock(&req->r_fill_mutex);
1989 req->r_aborted = true;
1990 mutex_unlock(&req->r_fill_mutex);
1992 if (req->r_locked_dir &&
1993 (req->r_op & CEPH_MDS_OP_WRITE))
1994 ceph_invalidate_dir_request(req);
2000 mutex_unlock(&mdsc->mutex);
2001 dout("do_request %p done, result %d\n", req, err);
2006 * Invalidate dir D_COMPLETE, dentry lease state on an aborted MDS
2007 * namespace request.
2009 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2011 struct inode *inode = req->r_locked_dir;
2012 struct ceph_inode_info *ci = ceph_inode(inode);
2014 dout("invalidate_dir_request %p (D_COMPLETE, lease(s))\n", inode);
2015 spin_lock(&ci->i_ceph_lock);
2016 ceph_dir_clear_complete(inode);
2017 ci->i_release_count++;
2018 spin_unlock(&ci->i_ceph_lock);
2021 ceph_invalidate_dentry_lease(req->r_dentry);
2022 if (req->r_old_dentry)
2023 ceph_invalidate_dentry_lease(req->r_old_dentry);
2029 * We take the session mutex and parse and process the reply immediately.
2030 * This preserves the logical ordering of replies, capabilities, etc., sent
2031 * by the MDS as they are applied to our local cache.
2033 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2035 struct ceph_mds_client *mdsc = session->s_mdsc;
2036 struct ceph_mds_request *req;
2037 struct ceph_mds_reply_head *head = msg->front.iov_base;
2038 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2041 int mds = session->s_mds;
2043 if (msg->front.iov_len < sizeof(*head)) {
2044 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2049 /* get request, session */
2050 tid = le64_to_cpu(msg->hdr.tid);
2051 mutex_lock(&mdsc->mutex);
2052 req = __lookup_request(mdsc, tid);
2054 dout("handle_reply on unknown tid %llu\n", tid);
2055 mutex_unlock(&mdsc->mutex);
2058 dout("handle_reply %p\n", req);
2060 /* correct session? */
2061 if (req->r_session != session) {
2062 pr_err("mdsc_handle_reply got %llu on session mds%d"
2063 " not mds%d\n", tid, session->s_mds,
2064 req->r_session ? req->r_session->s_mds : -1);
2065 mutex_unlock(&mdsc->mutex);
2070 if ((req->r_got_unsafe && !head->safe) ||
2071 (req->r_got_safe && head->safe)) {
2072 pr_warning("got a dup %s reply on %llu from mds%d\n",
2073 head->safe ? "safe" : "unsafe", tid, mds);
2074 mutex_unlock(&mdsc->mutex);
2077 if (req->r_got_safe && !head->safe) {
2078 pr_warning("got unsafe after safe on %llu from mds%d\n",
2080 mutex_unlock(&mdsc->mutex);
2084 result = le32_to_cpu(head->result);
2088 * if we're not talking to the authority, send to them
2089 * if the authority has changed while we weren't looking,
2090 * send to new authority
2091 * Otherwise we just have to return an ESTALE
2093 if (result == -ESTALE) {
2094 dout("got ESTALE on request %llu", req->r_tid);
2095 if (!req->r_inode) {
2096 /* do nothing; not an authority problem */
2097 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2098 dout("not using auth, setting for that now");
2099 req->r_direct_mode = USE_AUTH_MDS;
2100 __do_request(mdsc, req);
2101 mutex_unlock(&mdsc->mutex);
2104 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2105 struct ceph_cap *cap = NULL;
2108 cap = ceph_get_cap_for_mds(ci,
2109 req->r_session->s_mds);
2111 dout("already using auth");
2112 if ((!cap || cap != ci->i_auth_cap) ||
2113 (cap->mseq != req->r_sent_on_mseq)) {
2114 dout("but cap changed, so resending");
2115 __do_request(mdsc, req);
2116 mutex_unlock(&mdsc->mutex);
2120 dout("have to return ESTALE on request %llu", req->r_tid);
2125 req->r_got_safe = true;
2126 __unregister_request(mdsc, req);
2127 complete_all(&req->r_safe_completion);
2129 if (req->r_got_unsafe) {
2131 * We already handled the unsafe response, now do the
2132 * cleanup. No need to examine the response; the MDS
2133 * doesn't include any result info in the safe
2134 * response. And even if it did, there is nothing
2135 * useful we could do with a revised return value.
2137 dout("got safe reply %llu, mds%d\n", tid, mds);
2138 list_del_init(&req->r_unsafe_item);
2140 /* last unsafe request during umount? */
2141 if (mdsc->stopping && !__get_oldest_req(mdsc))
2142 complete_all(&mdsc->safe_umount_waiters);
2143 mutex_unlock(&mdsc->mutex);
2147 req->r_got_unsafe = true;
2148 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2151 dout("handle_reply tid %lld result %d\n", tid, result);
2152 rinfo = &req->r_reply_info;
2153 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2154 mutex_unlock(&mdsc->mutex);
2156 mutex_lock(&session->s_mutex);
2158 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2164 if (rinfo->snapblob_len) {
2165 down_write(&mdsc->snap_rwsem);
2166 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2167 rinfo->snapblob + rinfo->snapblob_len,
2168 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2169 downgrade_write(&mdsc->snap_rwsem);
2171 down_read(&mdsc->snap_rwsem);
2174 /* insert trace into our cache */
2175 mutex_lock(&req->r_fill_mutex);
2176 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2178 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2180 ceph_readdir_prepopulate(req, req->r_session);
2181 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2183 mutex_unlock(&req->r_fill_mutex);
2185 up_read(&mdsc->snap_rwsem);
2187 mutex_lock(&mdsc->mutex);
2188 if (!req->r_aborted) {
2194 req->r_got_result = true;
2197 dout("reply arrived after request %lld was aborted\n", tid);
2199 mutex_unlock(&mdsc->mutex);
2201 ceph_add_cap_releases(mdsc, req->r_session);
2202 mutex_unlock(&session->s_mutex);
2204 /* kick calling process */
2205 complete_request(mdsc, req);
2207 ceph_mdsc_put_request(req);
2214 * handle mds notification that our request has been forwarded.
2216 static void handle_forward(struct ceph_mds_client *mdsc,
2217 struct ceph_mds_session *session,
2218 struct ceph_msg *msg)
2220 struct ceph_mds_request *req;
2221 u64 tid = le64_to_cpu(msg->hdr.tid);
2225 void *p = msg->front.iov_base;
2226 void *end = p + msg->front.iov_len;
2228 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2229 next_mds = ceph_decode_32(&p);
2230 fwd_seq = ceph_decode_32(&p);
2232 mutex_lock(&mdsc->mutex);
2233 req = __lookup_request(mdsc, tid);
2235 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2236 goto out; /* dup reply? */
2239 if (req->r_aborted) {
2240 dout("forward tid %llu aborted, unregistering\n", tid);
2241 __unregister_request(mdsc, req);
2242 } else if (fwd_seq <= req->r_num_fwd) {
2243 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2244 tid, next_mds, req->r_num_fwd, fwd_seq);
2246 /* resend. forward race not possible; mds would drop */
2247 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2249 BUG_ON(req->r_got_result);
2250 req->r_num_fwd = fwd_seq;
2251 req->r_resend_mds = next_mds;
2252 put_request_session(req);
2253 __do_request(mdsc, req);
2255 ceph_mdsc_put_request(req);
2257 mutex_unlock(&mdsc->mutex);
2261 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2265 * handle a mds session control message
2267 static void handle_session(struct ceph_mds_session *session,
2268 struct ceph_msg *msg)
2270 struct ceph_mds_client *mdsc = session->s_mdsc;
2273 int mds = session->s_mds;
2274 struct ceph_mds_session_head *h = msg->front.iov_base;
2278 if (msg->front.iov_len != sizeof(*h))
2280 op = le32_to_cpu(h->op);
2281 seq = le64_to_cpu(h->seq);
2283 mutex_lock(&mdsc->mutex);
2284 if (op == CEPH_SESSION_CLOSE)
2285 __unregister_session(mdsc, session);
2286 /* FIXME: this ttl calculation is generous */
2287 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2288 mutex_unlock(&mdsc->mutex);
2290 mutex_lock(&session->s_mutex);
2292 dout("handle_session mds%d %s %p state %s seq %llu\n",
2293 mds, ceph_session_op_name(op), session,
2294 session_state_name(session->s_state), seq);
2296 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2297 session->s_state = CEPH_MDS_SESSION_OPEN;
2298 pr_info("mds%d came back\n", session->s_mds);
2302 case CEPH_SESSION_OPEN:
2303 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2304 pr_info("mds%d reconnect success\n", session->s_mds);
2305 session->s_state = CEPH_MDS_SESSION_OPEN;
2306 renewed_caps(mdsc, session, 0);
2309 __close_session(mdsc, session);
2312 case CEPH_SESSION_RENEWCAPS:
2313 if (session->s_renew_seq == seq)
2314 renewed_caps(mdsc, session, 1);
2317 case CEPH_SESSION_CLOSE:
2318 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2319 pr_info("mds%d reconnect denied\n", session->s_mds);
2320 remove_session_caps(session);
2321 wake = 1; /* for good measure */
2322 wake_up_all(&mdsc->session_close_wq);
2323 kick_requests(mdsc, mds);
2326 case CEPH_SESSION_STALE:
2327 pr_info("mds%d caps went stale, renewing\n",
2329 spin_lock(&session->s_gen_ttl_lock);
2330 session->s_cap_gen++;
2331 session->s_cap_ttl = jiffies - 1;
2332 spin_unlock(&session->s_gen_ttl_lock);
2333 send_renew_caps(mdsc, session);
2336 case CEPH_SESSION_RECALL_STATE:
2337 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2341 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2345 mutex_unlock(&session->s_mutex);
2347 mutex_lock(&mdsc->mutex);
2348 __wake_requests(mdsc, &session->s_waiting);
2349 mutex_unlock(&mdsc->mutex);
2354 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2355 (int)msg->front.iov_len);
2362 * called under session->mutex.
2364 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2365 struct ceph_mds_session *session)
2367 struct ceph_mds_request *req, *nreq;
2370 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2372 mutex_lock(&mdsc->mutex);
2373 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2374 err = __prepare_send_request(mdsc, req, session->s_mds);
2376 ceph_msg_get(req->r_request);
2377 ceph_con_send(&session->s_con, req->r_request);
2380 mutex_unlock(&mdsc->mutex);
2384 * Encode information about a cap for a reconnect with the MDS.
2386 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2390 struct ceph_mds_cap_reconnect v2;
2391 struct ceph_mds_cap_reconnect_v1 v1;
2394 struct ceph_inode_info *ci;
2395 struct ceph_reconnect_state *recon_state = arg;
2396 struct ceph_pagelist *pagelist = recon_state->pagelist;
2400 struct dentry *dentry;
2404 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2405 inode, ceph_vinop(inode), cap, cap->cap_id,
2406 ceph_cap_string(cap->issued));
2407 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2411 dentry = d_find_alias(inode);
2413 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2415 err = PTR_ERR(path);
2422 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2426 spin_lock(&ci->i_ceph_lock);
2427 cap->seq = 0; /* reset cap seq */
2428 cap->issue_seq = 0; /* and issue_seq */
2430 if (recon_state->flock) {
2431 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2432 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2433 rec.v2.issued = cpu_to_le32(cap->issued);
2434 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2435 rec.v2.pathbase = cpu_to_le64(pathbase);
2436 rec.v2.flock_len = 0;
2437 reclen = sizeof(rec.v2);
2439 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2440 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2441 rec.v1.issued = cpu_to_le32(cap->issued);
2442 rec.v1.size = cpu_to_le64(inode->i_size);
2443 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2444 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2445 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2446 rec.v1.pathbase = cpu_to_le64(pathbase);
2447 reclen = sizeof(rec.v1);
2449 spin_unlock(&ci->i_ceph_lock);
2451 if (recon_state->flock) {
2452 int num_fcntl_locks, num_flock_locks;
2453 struct ceph_pagelist_cursor trunc_point;
2455 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2458 ceph_count_locks(inode, &num_fcntl_locks,
2460 rec.v2.flock_len = (2*sizeof(u32) +
2461 (num_fcntl_locks+num_flock_locks) *
2462 sizeof(struct ceph_filelock));
2465 /* pre-alloc pagelist */
2466 ceph_pagelist_truncate(pagelist, &trunc_point);
2467 err = ceph_pagelist_append(pagelist, &rec, reclen);
2469 err = ceph_pagelist_reserve(pagelist,
2475 err = ceph_encode_locks(inode,
2481 } while (err == -ENOSPC);
2483 err = ceph_pagelist_append(pagelist, &rec, reclen);
2495 * If an MDS fails and recovers, clients need to reconnect in order to
2496 * reestablish shared state. This includes all caps issued through
2497 * this session _and_ the snap_realm hierarchy. Because it's not
2498 * clear which snap realms the mds cares about, we send everything we
2499 * know about.. that ensures we'll then get any new info the
2500 * recovering MDS might have.
2502 * This is a relatively heavyweight operation, but it's rare.
2504 * called with mdsc->mutex held.
2506 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2507 struct ceph_mds_session *session)
2509 struct ceph_msg *reply;
2511 int mds = session->s_mds;
2513 struct ceph_pagelist *pagelist;
2514 struct ceph_reconnect_state recon_state;
2516 pr_info("mds%d reconnect start\n", mds);
2518 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2520 goto fail_nopagelist;
2521 ceph_pagelist_init(pagelist);
2523 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2527 mutex_lock(&session->s_mutex);
2528 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2531 ceph_con_open(&session->s_con,
2532 CEPH_ENTITY_TYPE_MDS, mds,
2533 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2535 /* replay unsafe requests */
2536 replay_unsafe_requests(mdsc, session);
2538 down_read(&mdsc->snap_rwsem);
2540 dout("session %p state %s\n", session,
2541 session_state_name(session->s_state));
2543 /* drop old cap expires; we're about to reestablish that state */
2544 discard_cap_releases(mdsc, session);
2546 /* traverse this session's caps */
2547 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2551 recon_state.pagelist = pagelist;
2552 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2553 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2558 * snaprealms. we provide mds with the ino, seq (version), and
2559 * parent for all of our realms. If the mds has any newer info,
2562 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2563 struct ceph_snap_realm *realm =
2564 rb_entry(p, struct ceph_snap_realm, node);
2565 struct ceph_mds_snaprealm_reconnect sr_rec;
2567 dout(" adding snap realm %llx seq %lld parent %llx\n",
2568 realm->ino, realm->seq, realm->parent_ino);
2569 sr_rec.ino = cpu_to_le64(realm->ino);
2570 sr_rec.seq = cpu_to_le64(realm->seq);
2571 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2572 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2577 reply->pagelist = pagelist;
2578 if (recon_state.flock)
2579 reply->hdr.version = cpu_to_le16(2);
2580 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2581 reply->nr_pages = calc_pages_for(0, pagelist->length);
2582 ceph_con_send(&session->s_con, reply);
2584 mutex_unlock(&session->s_mutex);
2586 mutex_lock(&mdsc->mutex);
2587 __wake_requests(mdsc, &session->s_waiting);
2588 mutex_unlock(&mdsc->mutex);
2590 up_read(&mdsc->snap_rwsem);
2594 ceph_msg_put(reply);
2595 up_read(&mdsc->snap_rwsem);
2596 mutex_unlock(&session->s_mutex);
2598 ceph_pagelist_release(pagelist);
2601 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2607 * compare old and new mdsmaps, kicking requests
2608 * and closing out old connections as necessary
2610 * called under mdsc->mutex.
2612 static void check_new_map(struct ceph_mds_client *mdsc,
2613 struct ceph_mdsmap *newmap,
2614 struct ceph_mdsmap *oldmap)
2617 int oldstate, newstate;
2618 struct ceph_mds_session *s;
2620 dout("check_new_map new %u old %u\n",
2621 newmap->m_epoch, oldmap->m_epoch);
2623 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2624 if (mdsc->sessions[i] == NULL)
2626 s = mdsc->sessions[i];
2627 oldstate = ceph_mdsmap_get_state(oldmap, i);
2628 newstate = ceph_mdsmap_get_state(newmap, i);
2630 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2631 i, ceph_mds_state_name(oldstate),
2632 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2633 ceph_mds_state_name(newstate),
2634 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2635 session_state_name(s->s_state));
2637 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2638 ceph_mdsmap_get_addr(newmap, i),
2639 sizeof(struct ceph_entity_addr))) {
2640 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2641 /* the session never opened, just close it
2643 __wake_requests(mdsc, &s->s_waiting);
2644 __unregister_session(mdsc, s);
2647 mutex_unlock(&mdsc->mutex);
2648 mutex_lock(&s->s_mutex);
2649 mutex_lock(&mdsc->mutex);
2650 ceph_con_close(&s->s_con);
2651 mutex_unlock(&s->s_mutex);
2652 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2655 /* kick any requests waiting on the recovering mds */
2656 kick_requests(mdsc, i);
2657 } else if (oldstate == newstate) {
2658 continue; /* nothing new with this mds */
2664 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2665 newstate >= CEPH_MDS_STATE_RECONNECT) {
2666 mutex_unlock(&mdsc->mutex);
2667 send_mds_reconnect(mdsc, s);
2668 mutex_lock(&mdsc->mutex);
2672 * kick request on any mds that has gone active.
2674 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2675 newstate >= CEPH_MDS_STATE_ACTIVE) {
2676 if (oldstate != CEPH_MDS_STATE_CREATING &&
2677 oldstate != CEPH_MDS_STATE_STARTING)
2678 pr_info("mds%d recovery completed\n", s->s_mds);
2679 kick_requests(mdsc, i);
2680 ceph_kick_flushing_caps(mdsc, s);
2681 wake_up_session_caps(s, 1);
2685 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2686 s = mdsc->sessions[i];
2689 if (!ceph_mdsmap_is_laggy(newmap, i))
2691 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2692 s->s_state == CEPH_MDS_SESSION_HUNG ||
2693 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2694 dout(" connecting to export targets of laggy mds%d\n",
2696 __open_export_target_sessions(mdsc, s);
2708 * caller must hold session s_mutex, dentry->d_lock
2710 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2712 struct ceph_dentry_info *di = ceph_dentry(dentry);
2714 ceph_put_mds_session(di->lease_session);
2715 di->lease_session = NULL;
2718 static void handle_lease(struct ceph_mds_client *mdsc,
2719 struct ceph_mds_session *session,
2720 struct ceph_msg *msg)
2722 struct super_block *sb = mdsc->fsc->sb;
2723 struct inode *inode;
2724 struct dentry *parent, *dentry;
2725 struct ceph_dentry_info *di;
2726 int mds = session->s_mds;
2727 struct ceph_mds_lease *h = msg->front.iov_base;
2729 struct ceph_vino vino;
2733 dout("handle_lease from mds%d\n", mds);
2736 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2738 vino.ino = le64_to_cpu(h->ino);
2739 vino.snap = CEPH_NOSNAP;
2740 seq = le32_to_cpu(h->seq);
2741 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2742 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2743 if (dname.len != get_unaligned_le32(h+1))
2746 mutex_lock(&session->s_mutex);
2750 inode = ceph_find_inode(sb, vino);
2751 dout("handle_lease %s, ino %llx %p %.*s\n",
2752 ceph_lease_op_name(h->action), vino.ino, inode,
2753 dname.len, dname.name);
2754 if (inode == NULL) {
2755 dout("handle_lease no inode %llx\n", vino.ino);
2760 parent = d_find_alias(inode);
2762 dout("no parent dentry on inode %p\n", inode);
2764 goto release; /* hrm... */
2766 dname.hash = full_name_hash(dname.name, dname.len);
2767 dentry = d_lookup(parent, &dname);
2772 spin_lock(&dentry->d_lock);
2773 di = ceph_dentry(dentry);
2774 switch (h->action) {
2775 case CEPH_MDS_LEASE_REVOKE:
2776 if (di->lease_session == session) {
2777 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2778 h->seq = cpu_to_le32(di->lease_seq);
2779 __ceph_mdsc_drop_dentry_lease(dentry);
2784 case CEPH_MDS_LEASE_RENEW:
2785 if (di->lease_session == session &&
2786 di->lease_gen == session->s_cap_gen &&
2787 di->lease_renew_from &&
2788 di->lease_renew_after == 0) {
2789 unsigned long duration =
2790 le32_to_cpu(h->duration_ms) * HZ / 1000;
2792 di->lease_seq = seq;
2793 dentry->d_time = di->lease_renew_from + duration;
2794 di->lease_renew_after = di->lease_renew_from +
2796 di->lease_renew_from = 0;
2800 spin_unlock(&dentry->d_lock);
2807 /* let's just reuse the same message */
2808 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2810 ceph_con_send(&session->s_con, msg);
2814 mutex_unlock(&session->s_mutex);
2818 pr_err("corrupt lease message\n");
2822 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2823 struct inode *inode,
2824 struct dentry *dentry, char action,
2827 struct ceph_msg *msg;
2828 struct ceph_mds_lease *lease;
2829 int len = sizeof(*lease) + sizeof(u32);
2832 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2833 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2834 dnamelen = dentry->d_name.len;
2837 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2840 lease = msg->front.iov_base;
2841 lease->action = action;
2842 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2843 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2844 lease->seq = cpu_to_le32(seq);
2845 put_unaligned_le32(dnamelen, lease + 1);
2846 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2849 * if this is a preemptive lease RELEASE, no need to
2850 * flush request stream, since the actual request will
2853 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2855 ceph_con_send(&session->s_con, msg);
2859 * Preemptively release a lease we expect to invalidate anyway.
2860 * Pass @inode always, @dentry is optional.
2862 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2863 struct dentry *dentry)
2865 struct ceph_dentry_info *di;
2866 struct ceph_mds_session *session;
2869 BUG_ON(inode == NULL);
2870 BUG_ON(dentry == NULL);
2872 /* is dentry lease valid? */
2873 spin_lock(&dentry->d_lock);
2874 di = ceph_dentry(dentry);
2875 if (!di || !di->lease_session ||
2876 di->lease_session->s_mds < 0 ||
2877 di->lease_gen != di->lease_session->s_cap_gen ||
2878 !time_before(jiffies, dentry->d_time)) {
2879 dout("lease_release inode %p dentry %p -- "
2882 spin_unlock(&dentry->d_lock);
2886 /* we do have a lease on this dentry; note mds and seq */
2887 session = ceph_get_mds_session(di->lease_session);
2888 seq = di->lease_seq;
2889 __ceph_mdsc_drop_dentry_lease(dentry);
2890 spin_unlock(&dentry->d_lock);
2892 dout("lease_release inode %p dentry %p to mds%d\n",
2893 inode, dentry, session->s_mds);
2894 ceph_mdsc_lease_send_msg(session, inode, dentry,
2895 CEPH_MDS_LEASE_RELEASE, seq);
2896 ceph_put_mds_session(session);
2900 * drop all leases (and dentry refs) in preparation for umount
2902 static void drop_leases(struct ceph_mds_client *mdsc)
2906 dout("drop_leases\n");
2907 mutex_lock(&mdsc->mutex);
2908 for (i = 0; i < mdsc->max_sessions; i++) {
2909 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2912 mutex_unlock(&mdsc->mutex);
2913 mutex_lock(&s->s_mutex);
2914 mutex_unlock(&s->s_mutex);
2915 ceph_put_mds_session(s);
2916 mutex_lock(&mdsc->mutex);
2918 mutex_unlock(&mdsc->mutex);
2924 * delayed work -- periodically trim expired leases, renew caps with mds
2926 static void schedule_delayed(struct ceph_mds_client *mdsc)
2929 unsigned hz = round_jiffies_relative(HZ * delay);
2930 schedule_delayed_work(&mdsc->delayed_work, hz);
2933 static void delayed_work(struct work_struct *work)
2936 struct ceph_mds_client *mdsc =
2937 container_of(work, struct ceph_mds_client, delayed_work.work);
2941 dout("mdsc delayed_work\n");
2942 ceph_check_delayed_caps(mdsc);
2944 mutex_lock(&mdsc->mutex);
2945 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2946 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2947 mdsc->last_renew_caps);
2949 mdsc->last_renew_caps = jiffies;
2951 for (i = 0; i < mdsc->max_sessions; i++) {
2952 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2955 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2956 dout("resending session close request for mds%d\n",
2958 request_close_session(mdsc, s);
2959 ceph_put_mds_session(s);
2962 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2963 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2964 s->s_state = CEPH_MDS_SESSION_HUNG;
2965 pr_info("mds%d hung\n", s->s_mds);
2968 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2969 /* this mds is failed or recovering, just wait */
2970 ceph_put_mds_session(s);
2973 mutex_unlock(&mdsc->mutex);
2975 mutex_lock(&s->s_mutex);
2977 send_renew_caps(mdsc, s);
2979 ceph_con_keepalive(&s->s_con);
2980 ceph_add_cap_releases(mdsc, s);
2981 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2982 s->s_state == CEPH_MDS_SESSION_HUNG)
2983 ceph_send_cap_releases(mdsc, s);
2984 mutex_unlock(&s->s_mutex);
2985 ceph_put_mds_session(s);
2987 mutex_lock(&mdsc->mutex);
2989 mutex_unlock(&mdsc->mutex);
2991 schedule_delayed(mdsc);
2994 int ceph_mdsc_init(struct ceph_fs_client *fsc)
2997 struct ceph_mds_client *mdsc;
2999 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3004 mutex_init(&mdsc->mutex);
3005 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3006 if (mdsc->mdsmap == NULL)
3009 init_completion(&mdsc->safe_umount_waiters);
3010 init_waitqueue_head(&mdsc->session_close_wq);
3011 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3012 mdsc->sessions = NULL;
3013 mdsc->max_sessions = 0;
3015 init_rwsem(&mdsc->snap_rwsem);
3016 mdsc->snap_realms = RB_ROOT;
3017 INIT_LIST_HEAD(&mdsc->snap_empty);
3018 spin_lock_init(&mdsc->snap_empty_lock);
3020 mdsc->request_tree = RB_ROOT;
3021 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3022 mdsc->last_renew_caps = jiffies;
3023 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3024 spin_lock_init(&mdsc->cap_delay_lock);
3025 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3026 spin_lock_init(&mdsc->snap_flush_lock);
3027 mdsc->cap_flush_seq = 0;
3028 INIT_LIST_HEAD(&mdsc->cap_dirty);
3029 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3030 mdsc->num_cap_flushing = 0;
3031 spin_lock_init(&mdsc->cap_dirty_lock);
3032 init_waitqueue_head(&mdsc->cap_flushing_wq);
3033 spin_lock_init(&mdsc->dentry_lru_lock);
3034 INIT_LIST_HEAD(&mdsc->dentry_lru);
3036 ceph_caps_init(mdsc);
3037 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3043 * Wait for safe replies on open mds requests. If we time out, drop
3044 * all requests from the tree to avoid dangling dentry refs.
3046 static void wait_requests(struct ceph_mds_client *mdsc)
3048 struct ceph_mds_request *req;
3049 struct ceph_fs_client *fsc = mdsc->fsc;
3051 mutex_lock(&mdsc->mutex);
3052 if (__get_oldest_req(mdsc)) {
3053 mutex_unlock(&mdsc->mutex);
3055 dout("wait_requests waiting for requests\n");
3056 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3057 fsc->client->options->mount_timeout * HZ);
3059 /* tear down remaining requests */
3060 mutex_lock(&mdsc->mutex);
3061 while ((req = __get_oldest_req(mdsc))) {
3062 dout("wait_requests timed out on tid %llu\n",
3064 __unregister_request(mdsc, req);
3067 mutex_unlock(&mdsc->mutex);
3068 dout("wait_requests done\n");
3072 * called before mount is ro, and before dentries are torn down.
3073 * (hmm, does this still race with new lookups?)
3075 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3077 dout("pre_umount\n");
3081 ceph_flush_dirty_caps(mdsc);
3082 wait_requests(mdsc);
3085 * wait for reply handlers to drop their request refs and
3086 * their inode/dcache refs
3092 * wait for all write mds requests to flush.
3094 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3096 struct ceph_mds_request *req = NULL, *nextreq;
3099 mutex_lock(&mdsc->mutex);
3100 dout("wait_unsafe_requests want %lld\n", want_tid);
3102 req = __get_oldest_req(mdsc);
3103 while (req && req->r_tid <= want_tid) {
3104 /* find next request */
3105 n = rb_next(&req->r_node);
3107 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3110 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3112 ceph_mdsc_get_request(req);
3114 ceph_mdsc_get_request(nextreq);
3115 mutex_unlock(&mdsc->mutex);
3116 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3117 req->r_tid, want_tid);
3118 wait_for_completion(&req->r_safe_completion);
3119 mutex_lock(&mdsc->mutex);
3120 ceph_mdsc_put_request(req);
3122 break; /* next dne before, so we're done! */
3123 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3124 /* next request was removed from tree */
3125 ceph_mdsc_put_request(nextreq);
3128 ceph_mdsc_put_request(nextreq); /* won't go away */
3132 mutex_unlock(&mdsc->mutex);
3133 dout("wait_unsafe_requests done\n");
3136 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3138 u64 want_tid, want_flush;
3140 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3144 mutex_lock(&mdsc->mutex);
3145 want_tid = mdsc->last_tid;
3146 want_flush = mdsc->cap_flush_seq;
3147 mutex_unlock(&mdsc->mutex);
3148 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3150 ceph_flush_dirty_caps(mdsc);
3152 wait_unsafe_requests(mdsc, want_tid);
3153 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3157 * true if all sessions are closed, or we force unmount
3159 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3163 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3166 mutex_lock(&mdsc->mutex);
3167 for (i = 0; i < mdsc->max_sessions; i++)
3168 if (mdsc->sessions[i])
3170 mutex_unlock(&mdsc->mutex);
3175 * called after sb is ro.
3177 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3179 struct ceph_mds_session *session;
3181 struct ceph_fs_client *fsc = mdsc->fsc;
3182 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3184 dout("close_sessions\n");
3186 /* close sessions */
3187 mutex_lock(&mdsc->mutex);
3188 for (i = 0; i < mdsc->max_sessions; i++) {
3189 session = __ceph_lookup_mds_session(mdsc, i);
3192 mutex_unlock(&mdsc->mutex);
3193 mutex_lock(&session->s_mutex);
3194 __close_session(mdsc, session);
3195 mutex_unlock(&session->s_mutex);
3196 ceph_put_mds_session(session);
3197 mutex_lock(&mdsc->mutex);
3199 mutex_unlock(&mdsc->mutex);
3201 dout("waiting for sessions to close\n");
3202 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3205 /* tear down remaining sessions */
3206 mutex_lock(&mdsc->mutex);
3207 for (i = 0; i < mdsc->max_sessions; i++) {
3208 if (mdsc->sessions[i]) {
3209 session = get_session(mdsc->sessions[i]);
3210 __unregister_session(mdsc, session);
3211 mutex_unlock(&mdsc->mutex);
3212 mutex_lock(&session->s_mutex);
3213 remove_session_caps(session);
3214 mutex_unlock(&session->s_mutex);
3215 ceph_put_mds_session(session);
3216 mutex_lock(&mdsc->mutex);
3219 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3220 mutex_unlock(&mdsc->mutex);
3222 ceph_cleanup_empty_realms(mdsc);
3224 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3229 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3232 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3234 ceph_mdsmap_destroy(mdsc->mdsmap);
3235 kfree(mdsc->sessions);
3236 ceph_caps_finalize(mdsc);
3239 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3241 struct ceph_mds_client *mdsc = fsc->mdsc;
3243 dout("mdsc_destroy %p\n", mdsc);
3244 ceph_mdsc_stop(mdsc);
3246 /* flush out any connection work with references to us */
3251 dout("mdsc_destroy %p done\n", mdsc);
3256 * handle mds map update.
3258 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3262 void *p = msg->front.iov_base;
3263 void *end = p + msg->front.iov_len;
3264 struct ceph_mdsmap *newmap, *oldmap;
3265 struct ceph_fsid fsid;
3268 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3269 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3270 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3272 epoch = ceph_decode_32(&p);
3273 maplen = ceph_decode_32(&p);
3274 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3276 /* do we need it? */
3277 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3278 mutex_lock(&mdsc->mutex);
3279 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3280 dout("handle_map epoch %u <= our %u\n",
3281 epoch, mdsc->mdsmap->m_epoch);
3282 mutex_unlock(&mdsc->mutex);
3286 newmap = ceph_mdsmap_decode(&p, end);
3287 if (IS_ERR(newmap)) {
3288 err = PTR_ERR(newmap);
3292 /* swap into place */
3294 oldmap = mdsc->mdsmap;
3295 mdsc->mdsmap = newmap;
3296 check_new_map(mdsc, newmap, oldmap);
3297 ceph_mdsmap_destroy(oldmap);
3299 mdsc->mdsmap = newmap; /* first mds map */
3301 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3303 __wake_requests(mdsc, &mdsc->waiting_for_map);
3305 mutex_unlock(&mdsc->mutex);
3306 schedule_delayed(mdsc);
3310 mutex_unlock(&mdsc->mutex);
3312 pr_err("error decoding mdsmap %d\n", err);
3316 static struct ceph_connection *con_get(struct ceph_connection *con)
3318 struct ceph_mds_session *s = con->private;
3320 if (get_session(s)) {
3321 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3324 dout("mdsc con_get %p FAIL\n", s);
3328 static void con_put(struct ceph_connection *con)
3330 struct ceph_mds_session *s = con->private;
3332 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3333 ceph_put_mds_session(s);
3337 * if the client is unresponsive for long enough, the mds will kill
3338 * the session entirely.
3340 static void peer_reset(struct ceph_connection *con)
3342 struct ceph_mds_session *s = con->private;
3343 struct ceph_mds_client *mdsc = s->s_mdsc;
3345 pr_warning("mds%d closed our session\n", s->s_mds);
3346 send_mds_reconnect(mdsc, s);
3349 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3351 struct ceph_mds_session *s = con->private;
3352 struct ceph_mds_client *mdsc = s->s_mdsc;
3353 int type = le16_to_cpu(msg->hdr.type);
3355 mutex_lock(&mdsc->mutex);
3356 if (__verify_registered_session(mdsc, s) < 0) {
3357 mutex_unlock(&mdsc->mutex);
3360 mutex_unlock(&mdsc->mutex);
3363 case CEPH_MSG_MDS_MAP:
3364 ceph_mdsc_handle_map(mdsc, msg);
3366 case CEPH_MSG_CLIENT_SESSION:
3367 handle_session(s, msg);
3369 case CEPH_MSG_CLIENT_REPLY:
3370 handle_reply(s, msg);
3372 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3373 handle_forward(mdsc, s, msg);
3375 case CEPH_MSG_CLIENT_CAPS:
3376 ceph_handle_caps(s, msg);
3378 case CEPH_MSG_CLIENT_SNAP:
3379 ceph_handle_snap(mdsc, s, msg);
3381 case CEPH_MSG_CLIENT_LEASE:
3382 handle_lease(mdsc, s, msg);
3386 pr_err("received unknown message type %d %s\n", type,
3387 ceph_msg_type_name(type));
3398 * Note: returned pointer is the address of a structure that's
3399 * managed separately. Caller must *not* attempt to free it.
3401 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3402 int *proto, int force_new)
3404 struct ceph_mds_session *s = con->private;
3405 struct ceph_mds_client *mdsc = s->s_mdsc;
3406 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3407 struct ceph_auth_handshake *auth = &s->s_auth;
3409 if (force_new && auth->authorizer) {
3410 if (ac->ops && ac->ops->destroy_authorizer)
3411 ac->ops->destroy_authorizer(ac, auth->authorizer);
3412 auth->authorizer = NULL;
3414 if (!auth->authorizer && ac->ops && ac->ops->create_authorizer) {
3415 int ret = ac->ops->create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3418 return ERR_PTR(ret);
3420 *proto = ac->protocol;
3426 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3428 struct ceph_mds_session *s = con->private;
3429 struct ceph_mds_client *mdsc = s->s_mdsc;
3430 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3432 return ac->ops->verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3435 static int invalidate_authorizer(struct ceph_connection *con)
3437 struct ceph_mds_session *s = con->private;
3438 struct ceph_mds_client *mdsc = s->s_mdsc;
3439 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3441 if (ac->ops->invalidate_authorizer)
3442 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3444 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3447 static const struct ceph_connection_operations mds_con_ops = {
3450 .dispatch = dispatch,
3451 .get_authorizer = get_authorizer,
3452 .verify_authorizer_reply = verify_authorizer_reply,
3453 .invalidate_authorizer = invalidate_authorizer,
3454 .peer_reset = peer_reset,