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/ceph_features.h>
14 #include <linux/ceph/messenger.h>
15 #include <linux/ceph/decode.h>
16 #include <linux/ceph/pagelist.h>
17 #include <linux/ceph/auth.h>
18 #include <linux/ceph/debugfs.h>
21 * A cluster of MDS (metadata server) daemons is responsible for
22 * managing the file system namespace (the directory hierarchy and
23 * inodes) and for coordinating shared access to storage. Metadata is
24 * partitioning hierarchically across a number of servers, and that
25 * partition varies over time as the cluster adjusts the distribution
26 * in order to balance load.
28 * The MDS client is primarily responsible to managing synchronous
29 * metadata requests for operations like open, unlink, and so forth.
30 * If there is a MDS failure, we find out about it when we (possibly
31 * request and) receive a new MDS map, and can resubmit affected
34 * For the most part, though, we take advantage of a lossless
35 * communications channel to the MDS, and do not need to worry about
36 * timing out or resubmitting requests.
38 * We maintain a stateful "session" with each MDS we interact with.
39 * Within each session, we sent periodic heartbeat messages to ensure
40 * any capabilities or leases we have been issues remain valid. If
41 * the session times out and goes stale, our leases and capabilities
42 * are no longer valid.
45 struct ceph_reconnect_state {
46 struct ceph_pagelist *pagelist;
50 static void __wake_requests(struct ceph_mds_client *mdsc,
51 struct list_head *head);
53 static const struct ceph_connection_operations mds_con_ops;
61 * parse individual inode info
63 static int parse_reply_info_in(void **p, void *end,
64 struct ceph_mds_reply_info_in *info,
70 *p += sizeof(struct ceph_mds_reply_inode) +
71 sizeof(*info->in->fragtree.splits) *
72 le32_to_cpu(info->in->fragtree.nsplits);
74 ceph_decode_32_safe(p, end, info->symlink_len, bad);
75 ceph_decode_need(p, end, info->symlink_len, bad);
77 *p += info->symlink_len;
79 if (features & CEPH_FEATURE_DIRLAYOUTHASH)
80 ceph_decode_copy_safe(p, end, &info->dir_layout,
81 sizeof(info->dir_layout), bad);
83 memset(&info->dir_layout, 0, sizeof(info->dir_layout));
85 ceph_decode_32_safe(p, end, info->xattr_len, bad);
86 ceph_decode_need(p, end, info->xattr_len, bad);
87 info->xattr_data = *p;
88 *p += info->xattr_len;
95 * parse a normal reply, which may contain a (dir+)dentry and/or a
98 static int parse_reply_info_trace(void **p, void *end,
99 struct ceph_mds_reply_info_parsed *info,
104 if (info->head->is_dentry) {
105 err = parse_reply_info_in(p, end, &info->diri, features);
109 if (unlikely(*p + sizeof(*info->dirfrag) > end))
112 *p += sizeof(*info->dirfrag) +
113 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
114 if (unlikely(*p > end))
117 ceph_decode_32_safe(p, end, info->dname_len, bad);
118 ceph_decode_need(p, end, info->dname_len, bad);
120 *p += info->dname_len;
122 *p += sizeof(*info->dlease);
125 if (info->head->is_target) {
126 err = parse_reply_info_in(p, end, &info->targeti, features);
131 if (unlikely(*p != end))
138 pr_err("problem parsing mds trace %d\n", err);
143 * parse readdir results
145 static int parse_reply_info_dir(void **p, void *end,
146 struct ceph_mds_reply_info_parsed *info,
153 if (*p + sizeof(*info->dir_dir) > end)
155 *p += sizeof(*info->dir_dir) +
156 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
160 ceph_decode_need(p, end, sizeof(num) + 2, bad);
161 num = ceph_decode_32(p);
162 info->dir_end = ceph_decode_8(p);
163 info->dir_complete = ceph_decode_8(p);
167 /* alloc large array */
169 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
170 sizeof(*info->dir_dname) +
171 sizeof(*info->dir_dname_len) +
172 sizeof(*info->dir_dlease),
174 if (info->dir_in == NULL) {
178 info->dir_dname = (void *)(info->dir_in + num);
179 info->dir_dname_len = (void *)(info->dir_dname + num);
180 info->dir_dlease = (void *)(info->dir_dname_len + num);
184 ceph_decode_need(p, end, sizeof(u32)*2, bad);
185 info->dir_dname_len[i] = ceph_decode_32(p);
186 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
187 info->dir_dname[i] = *p;
188 *p += info->dir_dname_len[i];
189 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
191 info->dir_dlease[i] = *p;
192 *p += sizeof(struct ceph_mds_reply_lease);
195 err = parse_reply_info_in(p, end, &info->dir_in[i], features);
210 pr_err("problem parsing dir contents %d\n", err);
215 * parse fcntl F_GETLK results
217 static int parse_reply_info_filelock(void **p, void *end,
218 struct ceph_mds_reply_info_parsed *info,
221 if (*p + sizeof(*info->filelock_reply) > end)
224 info->filelock_reply = *p;
225 *p += sizeof(*info->filelock_reply);
227 if (unlikely(*p != end))
236 * parse create results
238 static int parse_reply_info_create(void **p, void *end,
239 struct ceph_mds_reply_info_parsed *info,
242 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
244 info->has_create_ino = false;
246 info->has_create_ino = true;
247 info->ino = ceph_decode_64(p);
251 if (unlikely(*p != end))
260 * parse extra results
262 static int parse_reply_info_extra(void **p, void *end,
263 struct ceph_mds_reply_info_parsed *info,
266 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
267 return parse_reply_info_filelock(p, end, info, features);
268 else if (info->head->op == CEPH_MDS_OP_READDIR ||
269 info->head->op == CEPH_MDS_OP_LSSNAP)
270 return parse_reply_info_dir(p, end, info, features);
271 else if (info->head->op == CEPH_MDS_OP_CREATE)
272 return parse_reply_info_create(p, end, info, features);
278 * parse entire mds reply
280 static int parse_reply_info(struct ceph_msg *msg,
281 struct ceph_mds_reply_info_parsed *info,
288 info->head = msg->front.iov_base;
289 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
290 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
293 ceph_decode_32_safe(&p, end, len, bad);
295 ceph_decode_need(&p, end, len, bad);
296 err = parse_reply_info_trace(&p, p+len, info, features);
302 ceph_decode_32_safe(&p, end, len, bad);
304 ceph_decode_need(&p, end, len, bad);
305 err = parse_reply_info_extra(&p, p+len, info, features);
311 ceph_decode_32_safe(&p, end, len, bad);
312 info->snapblob_len = len;
323 pr_err("mds parse_reply err %d\n", err);
327 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
336 static const char *session_state_name(int s)
339 case CEPH_MDS_SESSION_NEW: return "new";
340 case CEPH_MDS_SESSION_OPENING: return "opening";
341 case CEPH_MDS_SESSION_OPEN: return "open";
342 case CEPH_MDS_SESSION_HUNG: return "hung";
343 case CEPH_MDS_SESSION_CLOSING: return "closing";
344 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
345 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
346 default: return "???";
350 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
352 if (atomic_inc_not_zero(&s->s_ref)) {
353 dout("mdsc get_session %p %d -> %d\n", s,
354 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
357 dout("mdsc get_session %p 0 -- FAIL", s);
362 void ceph_put_mds_session(struct ceph_mds_session *s)
364 dout("mdsc put_session %p %d -> %d\n", s,
365 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
366 if (atomic_dec_and_test(&s->s_ref)) {
367 if (s->s_auth.authorizer)
368 ceph_auth_destroy_authorizer(
369 s->s_mdsc->fsc->client->monc.auth,
370 s->s_auth.authorizer);
376 * called under mdsc->mutex
378 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
381 struct ceph_mds_session *session;
383 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
385 session = mdsc->sessions[mds];
386 dout("lookup_mds_session %p %d\n", session,
387 atomic_read(&session->s_ref));
388 get_session(session);
392 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
394 if (mds >= mdsc->max_sessions)
396 return mdsc->sessions[mds];
399 static int __verify_registered_session(struct ceph_mds_client *mdsc,
400 struct ceph_mds_session *s)
402 if (s->s_mds >= mdsc->max_sessions ||
403 mdsc->sessions[s->s_mds] != s)
409 * create+register a new session for given mds.
410 * called under mdsc->mutex.
412 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
415 struct ceph_mds_session *s;
417 if (mds >= mdsc->mdsmap->m_max_mds)
418 return ERR_PTR(-EINVAL);
420 s = kzalloc(sizeof(*s), GFP_NOFS);
422 return ERR_PTR(-ENOMEM);
425 s->s_state = CEPH_MDS_SESSION_NEW;
428 mutex_init(&s->s_mutex);
430 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
432 spin_lock_init(&s->s_gen_ttl_lock);
434 s->s_cap_ttl = jiffies - 1;
436 spin_lock_init(&s->s_cap_lock);
437 s->s_renew_requested = 0;
439 INIT_LIST_HEAD(&s->s_caps);
442 atomic_set(&s->s_ref, 1);
443 INIT_LIST_HEAD(&s->s_waiting);
444 INIT_LIST_HEAD(&s->s_unsafe);
445 s->s_num_cap_releases = 0;
446 s->s_cap_iterator = NULL;
447 INIT_LIST_HEAD(&s->s_cap_releases);
448 INIT_LIST_HEAD(&s->s_cap_releases_done);
449 INIT_LIST_HEAD(&s->s_cap_flushing);
450 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
452 dout("register_session mds%d\n", mds);
453 if (mds >= mdsc->max_sessions) {
454 int newmax = 1 << get_count_order(mds+1);
455 struct ceph_mds_session **sa;
457 dout("register_session realloc to %d\n", newmax);
458 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
461 if (mdsc->sessions) {
462 memcpy(sa, mdsc->sessions,
463 mdsc->max_sessions * sizeof(void *));
464 kfree(mdsc->sessions);
467 mdsc->max_sessions = newmax;
469 mdsc->sessions[mds] = s;
470 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
472 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
473 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
479 return ERR_PTR(-ENOMEM);
483 * called under mdsc->mutex
485 static void __unregister_session(struct ceph_mds_client *mdsc,
486 struct ceph_mds_session *s)
488 dout("__unregister_session mds%d %p\n", s->s_mds, s);
489 BUG_ON(mdsc->sessions[s->s_mds] != s);
490 mdsc->sessions[s->s_mds] = NULL;
491 ceph_con_close(&s->s_con);
492 ceph_put_mds_session(s);
496 * drop session refs in request.
498 * should be last request ref, or hold mdsc->mutex
500 static void put_request_session(struct ceph_mds_request *req)
502 if (req->r_session) {
503 ceph_put_mds_session(req->r_session);
504 req->r_session = NULL;
508 void ceph_mdsc_release_request(struct kref *kref)
510 struct ceph_mds_request *req = container_of(kref,
511 struct ceph_mds_request,
514 ceph_msg_put(req->r_request);
516 ceph_msg_put(req->r_reply);
517 destroy_reply_info(&req->r_reply_info);
520 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
523 if (req->r_locked_dir)
524 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
525 if (req->r_target_inode)
526 iput(req->r_target_inode);
529 if (req->r_old_dentry) {
531 * track (and drop pins for) r_old_dentry_dir
532 * separately, since r_old_dentry's d_parent may have
533 * changed between the dir mutex being dropped and
534 * this request being freed.
536 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
538 dput(req->r_old_dentry);
539 iput(req->r_old_dentry_dir);
543 put_request_session(req);
544 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
549 * lookup session, bump ref if found.
551 * called under mdsc->mutex.
553 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
556 struct ceph_mds_request *req;
557 struct rb_node *n = mdsc->request_tree.rb_node;
560 req = rb_entry(n, struct ceph_mds_request, r_node);
561 if (tid < req->r_tid)
563 else if (tid > req->r_tid)
566 ceph_mdsc_get_request(req);
573 static void __insert_request(struct ceph_mds_client *mdsc,
574 struct ceph_mds_request *new)
576 struct rb_node **p = &mdsc->request_tree.rb_node;
577 struct rb_node *parent = NULL;
578 struct ceph_mds_request *req = NULL;
582 req = rb_entry(parent, struct ceph_mds_request, r_node);
583 if (new->r_tid < req->r_tid)
585 else if (new->r_tid > req->r_tid)
591 rb_link_node(&new->r_node, parent, p);
592 rb_insert_color(&new->r_node, &mdsc->request_tree);
596 * Register an in-flight request, and assign a tid. Link to directory
597 * are modifying (if any).
599 * Called under mdsc->mutex.
601 static void __register_request(struct ceph_mds_client *mdsc,
602 struct ceph_mds_request *req,
605 req->r_tid = ++mdsc->last_tid;
607 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
609 dout("__register_request %p tid %lld\n", req, req->r_tid);
610 ceph_mdsc_get_request(req);
611 __insert_request(mdsc, req);
613 req->r_uid = current_fsuid();
614 req->r_gid = current_fsgid();
617 struct ceph_inode_info *ci = ceph_inode(dir);
620 spin_lock(&ci->i_unsafe_lock);
621 req->r_unsafe_dir = dir;
622 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
623 spin_unlock(&ci->i_unsafe_lock);
627 static void __unregister_request(struct ceph_mds_client *mdsc,
628 struct ceph_mds_request *req)
630 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
631 rb_erase(&req->r_node, &mdsc->request_tree);
632 RB_CLEAR_NODE(&req->r_node);
634 if (req->r_unsafe_dir) {
635 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
637 spin_lock(&ci->i_unsafe_lock);
638 list_del_init(&req->r_unsafe_dir_item);
639 spin_unlock(&ci->i_unsafe_lock);
641 iput(req->r_unsafe_dir);
642 req->r_unsafe_dir = NULL;
645 ceph_mdsc_put_request(req);
649 * Choose mds to send request to next. If there is a hint set in the
650 * request (e.g., due to a prior forward hint from the mds), use that.
651 * Otherwise, consult frag tree and/or caps to identify the
652 * appropriate mds. If all else fails, choose randomly.
654 * Called under mdsc->mutex.
656 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
659 * we don't need to worry about protecting the d_parent access
660 * here because we never renaming inside the snapped namespace
661 * except to resplice to another snapdir, and either the old or new
662 * result is a valid result.
664 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
665 dentry = dentry->d_parent;
669 static int __choose_mds(struct ceph_mds_client *mdsc,
670 struct ceph_mds_request *req)
673 struct ceph_inode_info *ci;
674 struct ceph_cap *cap;
675 int mode = req->r_direct_mode;
677 u32 hash = req->r_direct_hash;
678 bool is_hash = req->r_direct_is_hash;
681 * is there a specific mds we should try? ignore hint if we have
682 * no session and the mds is not up (active or recovering).
684 if (req->r_resend_mds >= 0 &&
685 (__have_session(mdsc, req->r_resend_mds) ||
686 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
687 dout("choose_mds using resend_mds mds%d\n",
689 return req->r_resend_mds;
692 if (mode == USE_RANDOM_MDS)
697 inode = req->r_inode;
698 } else if (req->r_dentry) {
699 /* ignore race with rename; old or new d_parent is okay */
700 struct dentry *parent = req->r_dentry->d_parent;
701 struct inode *dir = parent->d_inode;
703 if (dir->i_sb != mdsc->fsc->sb) {
705 inode = req->r_dentry->d_inode;
706 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
707 /* direct snapped/virtual snapdir requests
708 * based on parent dir inode */
709 struct dentry *dn = get_nonsnap_parent(parent);
711 dout("__choose_mds using nonsnap parent %p\n", inode);
712 } else if (req->r_dentry->d_inode) {
714 inode = req->r_dentry->d_inode;
718 hash = ceph_dentry_hash(dir, req->r_dentry);
723 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
727 ci = ceph_inode(inode);
729 if (is_hash && S_ISDIR(inode->i_mode)) {
730 struct ceph_inode_frag frag;
733 ceph_choose_frag(ci, hash, &frag, &found);
735 if (mode == USE_ANY_MDS && frag.ndist > 0) {
738 /* choose a random replica */
739 get_random_bytes(&r, 1);
742 dout("choose_mds %p %llx.%llx "
743 "frag %u mds%d (%d/%d)\n",
744 inode, ceph_vinop(inode),
747 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
748 CEPH_MDS_STATE_ACTIVE)
752 /* since this file/dir wasn't known to be
753 * replicated, then we want to look for the
754 * authoritative mds. */
757 /* choose auth mds */
759 dout("choose_mds %p %llx.%llx "
760 "frag %u mds%d (auth)\n",
761 inode, ceph_vinop(inode), frag.frag, mds);
762 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
763 CEPH_MDS_STATE_ACTIVE)
769 spin_lock(&ci->i_ceph_lock);
771 if (mode == USE_AUTH_MDS)
772 cap = ci->i_auth_cap;
773 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
774 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
776 spin_unlock(&ci->i_ceph_lock);
779 mds = cap->session->s_mds;
780 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
781 inode, ceph_vinop(inode), mds,
782 cap == ci->i_auth_cap ? "auth " : "", cap);
783 spin_unlock(&ci->i_ceph_lock);
787 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
788 dout("choose_mds chose random mds%d\n", mds);
796 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
798 struct ceph_msg *msg;
799 struct ceph_mds_session_head *h;
801 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
804 pr_err("create_session_msg ENOMEM creating msg\n");
807 h = msg->front.iov_base;
808 h->op = cpu_to_le32(op);
809 h->seq = cpu_to_le64(seq);
814 * send session open request.
816 * called under mdsc->mutex
818 static int __open_session(struct ceph_mds_client *mdsc,
819 struct ceph_mds_session *session)
821 struct ceph_msg *msg;
823 int mds = session->s_mds;
825 /* wait for mds to go active? */
826 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
827 dout("open_session to mds%d (%s)\n", mds,
828 ceph_mds_state_name(mstate));
829 session->s_state = CEPH_MDS_SESSION_OPENING;
830 session->s_renew_requested = jiffies;
832 /* send connect message */
833 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
836 ceph_con_send(&session->s_con, msg);
841 * open sessions for any export targets for the given mds
843 * called under mdsc->mutex
845 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
846 struct ceph_mds_session *session)
848 struct ceph_mds_info *mi;
849 struct ceph_mds_session *ts;
850 int i, mds = session->s_mds;
853 if (mds >= mdsc->mdsmap->m_max_mds)
855 mi = &mdsc->mdsmap->m_info[mds];
856 dout("open_export_target_sessions for mds%d (%d targets)\n",
857 session->s_mds, mi->num_export_targets);
859 for (i = 0; i < mi->num_export_targets; i++) {
860 target = mi->export_targets[i];
861 ts = __ceph_lookup_mds_session(mdsc, target);
863 ts = register_session(mdsc, target);
867 if (session->s_state == CEPH_MDS_SESSION_NEW ||
868 session->s_state == CEPH_MDS_SESSION_CLOSING)
869 __open_session(mdsc, session);
871 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
872 i, ts, session_state_name(ts->s_state));
873 ceph_put_mds_session(ts);
877 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
878 struct ceph_mds_session *session)
880 mutex_lock(&mdsc->mutex);
881 __open_export_target_sessions(mdsc, session);
882 mutex_unlock(&mdsc->mutex);
890 * Free preallocated cap messages assigned to this session
892 static void cleanup_cap_releases(struct ceph_mds_session *session)
894 struct ceph_msg *msg;
896 spin_lock(&session->s_cap_lock);
897 while (!list_empty(&session->s_cap_releases)) {
898 msg = list_first_entry(&session->s_cap_releases,
899 struct ceph_msg, list_head);
900 list_del_init(&msg->list_head);
903 while (!list_empty(&session->s_cap_releases_done)) {
904 msg = list_first_entry(&session->s_cap_releases_done,
905 struct ceph_msg, list_head);
906 list_del_init(&msg->list_head);
909 spin_unlock(&session->s_cap_lock);
913 * Helper to safely iterate over all caps associated with a session, with
914 * special care taken to handle a racing __ceph_remove_cap().
916 * Caller must hold session s_mutex.
918 static int iterate_session_caps(struct ceph_mds_session *session,
919 int (*cb)(struct inode *, struct ceph_cap *,
923 struct ceph_cap *cap;
924 struct inode *inode, *last_inode = NULL;
925 struct ceph_cap *old_cap = NULL;
928 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
929 spin_lock(&session->s_cap_lock);
930 p = session->s_caps.next;
931 while (p != &session->s_caps) {
932 cap = list_entry(p, struct ceph_cap, session_caps);
933 inode = igrab(&cap->ci->vfs_inode);
938 session->s_cap_iterator = cap;
939 spin_unlock(&session->s_cap_lock);
946 ceph_put_cap(session->s_mdsc, old_cap);
950 ret = cb(inode, cap, arg);
953 spin_lock(&session->s_cap_lock);
955 if (cap->ci == NULL) {
956 dout("iterate_session_caps finishing cap %p removal\n",
958 BUG_ON(cap->session != session);
959 list_del_init(&cap->session_caps);
960 session->s_nr_caps--;
962 old_cap = cap; /* put_cap it w/o locks held */
969 session->s_cap_iterator = NULL;
970 spin_unlock(&session->s_cap_lock);
975 ceph_put_cap(session->s_mdsc, old_cap);
980 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
983 struct ceph_inode_info *ci = ceph_inode(inode);
986 dout("removing cap %p, ci is %p, inode is %p\n",
987 cap, ci, &ci->vfs_inode);
988 spin_lock(&ci->i_ceph_lock);
989 __ceph_remove_cap(cap);
990 if (!__ceph_is_any_real_caps(ci)) {
991 struct ceph_mds_client *mdsc =
992 ceph_sb_to_client(inode->i_sb)->mdsc;
994 spin_lock(&mdsc->cap_dirty_lock);
995 if (!list_empty(&ci->i_dirty_item)) {
996 pr_info(" dropping dirty %s state for %p %lld\n",
997 ceph_cap_string(ci->i_dirty_caps),
998 inode, ceph_ino(inode));
999 ci->i_dirty_caps = 0;
1000 list_del_init(&ci->i_dirty_item);
1003 if (!list_empty(&ci->i_flushing_item)) {
1004 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1005 ceph_cap_string(ci->i_flushing_caps),
1006 inode, ceph_ino(inode));
1007 ci->i_flushing_caps = 0;
1008 list_del_init(&ci->i_flushing_item);
1009 mdsc->num_cap_flushing--;
1012 if (drop && ci->i_wrbuffer_ref) {
1013 pr_info(" dropping dirty data for %p %lld\n",
1014 inode, ceph_ino(inode));
1015 ci->i_wrbuffer_ref = 0;
1016 ci->i_wrbuffer_ref_head = 0;
1019 spin_unlock(&mdsc->cap_dirty_lock);
1021 spin_unlock(&ci->i_ceph_lock);
1028 * caller must hold session s_mutex
1030 static void remove_session_caps(struct ceph_mds_session *session)
1032 dout("remove_session_caps on %p\n", session);
1033 iterate_session_caps(session, remove_session_caps_cb, NULL);
1035 spin_lock(&session->s_cap_lock);
1036 if (session->s_nr_caps > 0) {
1037 struct super_block *sb = session->s_mdsc->fsc->sb;
1038 struct inode *inode;
1039 struct ceph_cap *cap, *prev = NULL;
1040 struct ceph_vino vino;
1042 * iterate_session_caps() skips inodes that are being
1043 * deleted, we need to wait until deletions are complete.
1044 * __wait_on_freeing_inode() is designed for the job,
1045 * but it is not exported, so use lookup inode function
1048 while (!list_empty(&session->s_caps)) {
1049 cap = list_entry(session->s_caps.next,
1050 struct ceph_cap, session_caps);
1054 vino = cap->ci->i_vino;
1055 spin_unlock(&session->s_cap_lock);
1057 inode = ceph_find_inode(sb, vino);
1060 spin_lock(&session->s_cap_lock);
1063 spin_unlock(&session->s_cap_lock);
1065 BUG_ON(session->s_nr_caps > 0);
1066 BUG_ON(!list_empty(&session->s_cap_flushing));
1067 cleanup_cap_releases(session);
1071 * wake up any threads waiting on this session's caps. if the cap is
1072 * old (didn't get renewed on the client reconnect), remove it now.
1074 * caller must hold s_mutex.
1076 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1079 struct ceph_inode_info *ci = ceph_inode(inode);
1081 wake_up_all(&ci->i_cap_wq);
1083 spin_lock(&ci->i_ceph_lock);
1084 ci->i_wanted_max_size = 0;
1085 ci->i_requested_max_size = 0;
1086 spin_unlock(&ci->i_ceph_lock);
1091 static void wake_up_session_caps(struct ceph_mds_session *session,
1094 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1095 iterate_session_caps(session, wake_up_session_cb,
1096 (void *)(unsigned long)reconnect);
1100 * Send periodic message to MDS renewing all currently held caps. The
1101 * ack will reset the expiration for all caps from this session.
1103 * caller holds s_mutex
1105 static int send_renew_caps(struct ceph_mds_client *mdsc,
1106 struct ceph_mds_session *session)
1108 struct ceph_msg *msg;
1111 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1112 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1113 pr_info("mds%d caps stale\n", session->s_mds);
1114 session->s_renew_requested = jiffies;
1116 /* do not try to renew caps until a recovering mds has reconnected
1117 * with its clients. */
1118 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1119 if (state < CEPH_MDS_STATE_RECONNECT) {
1120 dout("send_renew_caps ignoring mds%d (%s)\n",
1121 session->s_mds, ceph_mds_state_name(state));
1125 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1126 ceph_mds_state_name(state));
1127 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1128 ++session->s_renew_seq);
1131 ceph_con_send(&session->s_con, msg);
1136 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1138 * Called under session->s_mutex
1140 static void renewed_caps(struct ceph_mds_client *mdsc,
1141 struct ceph_mds_session *session, int is_renew)
1146 spin_lock(&session->s_cap_lock);
1147 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1149 session->s_cap_ttl = session->s_renew_requested +
1150 mdsc->mdsmap->m_session_timeout*HZ;
1153 if (time_before(jiffies, session->s_cap_ttl)) {
1154 pr_info("mds%d caps renewed\n", session->s_mds);
1157 pr_info("mds%d caps still stale\n", session->s_mds);
1160 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1161 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1162 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1163 spin_unlock(&session->s_cap_lock);
1166 wake_up_session_caps(session, 0);
1170 * send a session close request
1172 static int request_close_session(struct ceph_mds_client *mdsc,
1173 struct ceph_mds_session *session)
1175 struct ceph_msg *msg;
1177 dout("request_close_session mds%d state %s seq %lld\n",
1178 session->s_mds, session_state_name(session->s_state),
1180 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1183 ceph_con_send(&session->s_con, msg);
1188 * Called with s_mutex held.
1190 static int __close_session(struct ceph_mds_client *mdsc,
1191 struct ceph_mds_session *session)
1193 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1195 session->s_state = CEPH_MDS_SESSION_CLOSING;
1196 return request_close_session(mdsc, session);
1200 * Trim old(er) caps.
1202 * Because we can't cache an inode without one or more caps, we do
1203 * this indirectly: if a cap is unused, we prune its aliases, at which
1204 * point the inode will hopefully get dropped to.
1206 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1207 * memory pressure from the MDS, though, so it needn't be perfect.
1209 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1211 struct ceph_mds_session *session = arg;
1212 struct ceph_inode_info *ci = ceph_inode(inode);
1213 int used, oissued, mine;
1215 if (session->s_trim_caps <= 0)
1218 spin_lock(&ci->i_ceph_lock);
1219 mine = cap->issued | cap->implemented;
1220 used = __ceph_caps_used(ci);
1221 oissued = __ceph_caps_issued_other(ci, cap);
1223 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1224 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1225 ceph_cap_string(used));
1226 if (ci->i_dirty_caps)
1227 goto out; /* dirty caps */
1228 if ((used & ~oissued) & mine)
1229 goto out; /* we need these caps */
1231 session->s_trim_caps--;
1233 /* we aren't the only cap.. just remove us */
1234 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1235 cap->mseq, cap->issue_seq);
1236 __ceph_remove_cap(cap);
1238 /* try to drop referring dentries */
1239 spin_unlock(&ci->i_ceph_lock);
1240 d_prune_aliases(inode);
1241 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1242 inode, cap, atomic_read(&inode->i_count));
1247 spin_unlock(&ci->i_ceph_lock);
1252 * Trim session cap count down to some max number.
1254 static int trim_caps(struct ceph_mds_client *mdsc,
1255 struct ceph_mds_session *session,
1258 int trim_caps = session->s_nr_caps - max_caps;
1260 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1261 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1262 if (trim_caps > 0) {
1263 session->s_trim_caps = trim_caps;
1264 iterate_session_caps(session, trim_caps_cb, session);
1265 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1266 session->s_mds, session->s_nr_caps, max_caps,
1267 trim_caps - session->s_trim_caps);
1268 session->s_trim_caps = 0;
1274 * Allocate cap_release messages. If there is a partially full message
1275 * in the queue, try to allocate enough to cover it's remainder, so that
1276 * we can send it immediately.
1278 * Called under s_mutex.
1280 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1281 struct ceph_mds_session *session)
1283 struct ceph_msg *msg, *partial = NULL;
1284 struct ceph_mds_cap_release *head;
1286 int extra = mdsc->fsc->mount_options->cap_release_safety;
1289 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1292 spin_lock(&session->s_cap_lock);
1294 if (!list_empty(&session->s_cap_releases)) {
1295 msg = list_first_entry(&session->s_cap_releases,
1298 head = msg->front.iov_base;
1299 num = le32_to_cpu(head->num);
1301 dout(" partial %p with (%d/%d)\n", msg, num,
1302 (int)CEPH_CAPS_PER_RELEASE);
1303 extra += CEPH_CAPS_PER_RELEASE - num;
1307 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1308 spin_unlock(&session->s_cap_lock);
1309 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1313 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1314 (int)msg->front.iov_len);
1315 head = msg->front.iov_base;
1316 head->num = cpu_to_le32(0);
1317 msg->front.iov_len = sizeof(*head);
1318 spin_lock(&session->s_cap_lock);
1319 list_add(&msg->list_head, &session->s_cap_releases);
1320 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1324 head = partial->front.iov_base;
1325 num = le32_to_cpu(head->num);
1326 dout(" queueing partial %p with %d/%d\n", partial, num,
1327 (int)CEPH_CAPS_PER_RELEASE);
1328 list_move_tail(&partial->list_head,
1329 &session->s_cap_releases_done);
1330 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1333 spin_unlock(&session->s_cap_lock);
1339 * flush all dirty inode data to disk.
1341 * returns true if we've flushed through want_flush_seq
1343 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1347 dout("check_cap_flush want %lld\n", want_flush_seq);
1348 mutex_lock(&mdsc->mutex);
1349 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1350 struct ceph_mds_session *session = mdsc->sessions[mds];
1354 get_session(session);
1355 mutex_unlock(&mdsc->mutex);
1357 mutex_lock(&session->s_mutex);
1358 if (!list_empty(&session->s_cap_flushing)) {
1359 struct ceph_inode_info *ci =
1360 list_entry(session->s_cap_flushing.next,
1361 struct ceph_inode_info,
1363 struct inode *inode = &ci->vfs_inode;
1365 spin_lock(&ci->i_ceph_lock);
1366 if (ci->i_cap_flush_seq <= want_flush_seq) {
1367 dout("check_cap_flush still flushing %p "
1368 "seq %lld <= %lld to mds%d\n", inode,
1369 ci->i_cap_flush_seq, want_flush_seq,
1373 spin_unlock(&ci->i_ceph_lock);
1375 mutex_unlock(&session->s_mutex);
1376 ceph_put_mds_session(session);
1380 mutex_lock(&mdsc->mutex);
1383 mutex_unlock(&mdsc->mutex);
1384 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1389 * called under s_mutex
1391 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1392 struct ceph_mds_session *session)
1394 struct ceph_msg *msg;
1396 dout("send_cap_releases mds%d\n", session->s_mds);
1397 spin_lock(&session->s_cap_lock);
1398 while (!list_empty(&session->s_cap_releases_done)) {
1399 msg = list_first_entry(&session->s_cap_releases_done,
1400 struct ceph_msg, list_head);
1401 list_del_init(&msg->list_head);
1402 spin_unlock(&session->s_cap_lock);
1403 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1404 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1405 ceph_con_send(&session->s_con, msg);
1406 spin_lock(&session->s_cap_lock);
1408 spin_unlock(&session->s_cap_lock);
1411 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1412 struct ceph_mds_session *session)
1414 struct ceph_msg *msg;
1415 struct ceph_mds_cap_release *head;
1418 dout("discard_cap_releases mds%d\n", session->s_mds);
1419 spin_lock(&session->s_cap_lock);
1421 /* zero out the in-progress message */
1422 msg = list_first_entry(&session->s_cap_releases,
1423 struct ceph_msg, list_head);
1424 head = msg->front.iov_base;
1425 num = le32_to_cpu(head->num);
1426 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1427 head->num = cpu_to_le32(0);
1428 msg->front.iov_len = sizeof(*head);
1429 session->s_num_cap_releases += num;
1431 /* requeue completed messages */
1432 while (!list_empty(&session->s_cap_releases_done)) {
1433 msg = list_first_entry(&session->s_cap_releases_done,
1434 struct ceph_msg, list_head);
1435 list_del_init(&msg->list_head);
1437 head = msg->front.iov_base;
1438 num = le32_to_cpu(head->num);
1439 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1441 session->s_num_cap_releases += num;
1442 head->num = cpu_to_le32(0);
1443 msg->front.iov_len = sizeof(*head);
1444 list_add(&msg->list_head, &session->s_cap_releases);
1447 spin_unlock(&session->s_cap_lock);
1455 * Create an mds request.
1457 struct ceph_mds_request *
1458 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1460 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1463 return ERR_PTR(-ENOMEM);
1465 mutex_init(&req->r_fill_mutex);
1467 req->r_started = jiffies;
1468 req->r_resend_mds = -1;
1469 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1471 kref_init(&req->r_kref);
1472 INIT_LIST_HEAD(&req->r_wait);
1473 init_completion(&req->r_completion);
1474 init_completion(&req->r_safe_completion);
1475 INIT_LIST_HEAD(&req->r_unsafe_item);
1478 req->r_direct_mode = mode;
1483 * return oldest (lowest) request, tid in request tree, 0 if none.
1485 * called under mdsc->mutex.
1487 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1489 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1491 return rb_entry(rb_first(&mdsc->request_tree),
1492 struct ceph_mds_request, r_node);
1495 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1497 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1505 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1506 * on build_path_from_dentry in fs/cifs/dir.c.
1508 * If @stop_on_nosnap, generate path relative to the first non-snapped
1511 * Encode hidden .snap dirs as a double /, i.e.
1512 * foo/.snap/bar -> foo//bar
1514 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1517 struct dentry *temp;
1523 return ERR_PTR(-EINVAL);
1527 seq = read_seqbegin(&rename_lock);
1529 for (temp = dentry; !IS_ROOT(temp);) {
1530 struct inode *inode = temp->d_inode;
1531 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1532 len++; /* slash only */
1533 else if (stop_on_nosnap && inode &&
1534 ceph_snap(inode) == CEPH_NOSNAP)
1537 len += 1 + temp->d_name.len;
1538 temp = temp->d_parent;
1542 len--; /* no leading '/' */
1544 path = kmalloc(len+1, GFP_NOFS);
1546 return ERR_PTR(-ENOMEM);
1548 path[pos] = 0; /* trailing null */
1550 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1551 struct inode *inode;
1553 spin_lock(&temp->d_lock);
1554 inode = temp->d_inode;
1555 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1556 dout("build_path path+%d: %p SNAPDIR\n",
1558 } else if (stop_on_nosnap && inode &&
1559 ceph_snap(inode) == CEPH_NOSNAP) {
1560 spin_unlock(&temp->d_lock);
1563 pos -= temp->d_name.len;
1565 spin_unlock(&temp->d_lock);
1568 strncpy(path + pos, temp->d_name.name,
1571 spin_unlock(&temp->d_lock);
1574 temp = temp->d_parent;
1577 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1578 pr_err("build_path did not end path lookup where "
1579 "expected, namelen is %d, pos is %d\n", len, pos);
1580 /* presumably this is only possible if racing with a
1581 rename of one of the parent directories (we can not
1582 lock the dentries above us to prevent this, but
1583 retrying should be harmless) */
1588 *base = ceph_ino(temp->d_inode);
1590 dout("build_path on %p %d built %llx '%.*s'\n",
1591 dentry, d_count(dentry), *base, len, path);
1595 static int build_dentry_path(struct dentry *dentry,
1596 const char **ppath, int *ppathlen, u64 *pino,
1601 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1602 *pino = ceph_ino(dentry->d_parent->d_inode);
1603 *ppath = dentry->d_name.name;
1604 *ppathlen = dentry->d_name.len;
1607 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1609 return PTR_ERR(path);
1615 static int build_inode_path(struct inode *inode,
1616 const char **ppath, int *ppathlen, u64 *pino,
1619 struct dentry *dentry;
1622 if (ceph_snap(inode) == CEPH_NOSNAP) {
1623 *pino = ceph_ino(inode);
1627 dentry = d_find_alias(inode);
1628 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1631 return PTR_ERR(path);
1638 * request arguments may be specified via an inode *, a dentry *, or
1639 * an explicit ino+path.
1641 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1642 const char *rpath, u64 rino,
1643 const char **ppath, int *pathlen,
1644 u64 *ino, int *freepath)
1649 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1650 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1652 } else if (rdentry) {
1653 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1654 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1656 } else if (rpath || rino) {
1659 *pathlen = rpath ? strlen(rpath) : 0;
1660 dout(" path %.*s\n", *pathlen, rpath);
1667 * called under mdsc->mutex
1669 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1670 struct ceph_mds_request *req,
1673 struct ceph_msg *msg;
1674 struct ceph_mds_request_head *head;
1675 const char *path1 = NULL;
1676 const char *path2 = NULL;
1677 u64 ino1 = 0, ino2 = 0;
1678 int pathlen1 = 0, pathlen2 = 0;
1679 int freepath1 = 0, freepath2 = 0;
1685 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1686 req->r_path1, req->r_ino1.ino,
1687 &path1, &pathlen1, &ino1, &freepath1);
1693 ret = set_request_path_attr(NULL, req->r_old_dentry,
1694 req->r_path2, req->r_ino2.ino,
1695 &path2, &pathlen2, &ino2, &freepath2);
1701 len = sizeof(*head) +
1702 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1704 /* calculate (max) length for cap releases */
1705 len += sizeof(struct ceph_mds_request_release) *
1706 (!!req->r_inode_drop + !!req->r_dentry_drop +
1707 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1708 if (req->r_dentry_drop)
1709 len += req->r_dentry->d_name.len;
1710 if (req->r_old_dentry_drop)
1711 len += req->r_old_dentry->d_name.len;
1713 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1715 msg = ERR_PTR(-ENOMEM);
1719 msg->hdr.tid = cpu_to_le64(req->r_tid);
1721 head = msg->front.iov_base;
1722 p = msg->front.iov_base + sizeof(*head);
1723 end = msg->front.iov_base + msg->front.iov_len;
1725 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1726 head->op = cpu_to_le32(req->r_op);
1727 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1728 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1729 head->args = req->r_args;
1731 ceph_encode_filepath(&p, end, ino1, path1);
1732 ceph_encode_filepath(&p, end, ino2, path2);
1734 /* make note of release offset, in case we need to replay */
1735 req->r_request_release_offset = p - msg->front.iov_base;
1739 if (req->r_inode_drop)
1740 releases += ceph_encode_inode_release(&p,
1741 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1742 mds, req->r_inode_drop, req->r_inode_unless, 0);
1743 if (req->r_dentry_drop)
1744 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1745 mds, req->r_dentry_drop, req->r_dentry_unless);
1746 if (req->r_old_dentry_drop)
1747 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1748 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1749 if (req->r_old_inode_drop)
1750 releases += ceph_encode_inode_release(&p,
1751 req->r_old_dentry->d_inode,
1752 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1753 head->num_releases = cpu_to_le16(releases);
1756 msg->front.iov_len = p - msg->front.iov_base;
1757 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1759 if (req->r_data_len) {
1760 /* outbound data set only by ceph_sync_setxattr() */
1761 BUG_ON(!req->r_pages);
1762 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
1765 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1766 msg->hdr.data_off = cpu_to_le16(0);
1770 kfree((char *)path2);
1773 kfree((char *)path1);
1779 * called under mdsc->mutex if error, under no mutex if
1782 static void complete_request(struct ceph_mds_client *mdsc,
1783 struct ceph_mds_request *req)
1785 if (req->r_callback)
1786 req->r_callback(mdsc, req);
1788 complete_all(&req->r_completion);
1792 * called under mdsc->mutex
1794 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1795 struct ceph_mds_request *req,
1798 struct ceph_mds_request_head *rhead;
1799 struct ceph_msg *msg;
1804 struct ceph_cap *cap =
1805 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1808 req->r_sent_on_mseq = cap->mseq;
1810 req->r_sent_on_mseq = -1;
1812 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1813 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1815 if (req->r_got_unsafe) {
1817 * Replay. Do not regenerate message (and rebuild
1818 * paths, etc.); just use the original message.
1819 * Rebuilding paths will break for renames because
1820 * d_move mangles the src name.
1822 msg = req->r_request;
1823 rhead = msg->front.iov_base;
1825 flags = le32_to_cpu(rhead->flags);
1826 flags |= CEPH_MDS_FLAG_REPLAY;
1827 rhead->flags = cpu_to_le32(flags);
1829 if (req->r_target_inode)
1830 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1832 rhead->num_retry = req->r_attempts - 1;
1834 /* remove cap/dentry releases from message */
1835 rhead->num_releases = 0;
1836 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1837 msg->front.iov_len = req->r_request_release_offset;
1841 if (req->r_request) {
1842 ceph_msg_put(req->r_request);
1843 req->r_request = NULL;
1845 msg = create_request_message(mdsc, req, mds);
1847 req->r_err = PTR_ERR(msg);
1848 complete_request(mdsc, req);
1849 return PTR_ERR(msg);
1851 req->r_request = msg;
1853 rhead = msg->front.iov_base;
1854 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1855 if (req->r_got_unsafe)
1856 flags |= CEPH_MDS_FLAG_REPLAY;
1857 if (req->r_locked_dir)
1858 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1859 rhead->flags = cpu_to_le32(flags);
1860 rhead->num_fwd = req->r_num_fwd;
1861 rhead->num_retry = req->r_attempts - 1;
1864 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1869 * send request, or put it on the appropriate wait list.
1871 static int __do_request(struct ceph_mds_client *mdsc,
1872 struct ceph_mds_request *req)
1874 struct ceph_mds_session *session = NULL;
1878 if (req->r_err || req->r_got_result)
1881 if (req->r_timeout &&
1882 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1883 dout("do_request timed out\n");
1888 put_request_session(req);
1890 mds = __choose_mds(mdsc, req);
1892 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1893 dout("do_request no mds or not active, waiting for map\n");
1894 list_add(&req->r_wait, &mdsc->waiting_for_map);
1898 /* get, open session */
1899 session = __ceph_lookup_mds_session(mdsc, mds);
1901 session = register_session(mdsc, mds);
1902 if (IS_ERR(session)) {
1903 err = PTR_ERR(session);
1907 req->r_session = get_session(session);
1909 dout("do_request mds%d session %p state %s\n", mds, session,
1910 session_state_name(session->s_state));
1911 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1912 session->s_state != CEPH_MDS_SESSION_HUNG) {
1913 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1914 session->s_state == CEPH_MDS_SESSION_CLOSING)
1915 __open_session(mdsc, session);
1916 list_add(&req->r_wait, &session->s_waiting);
1921 req->r_resend_mds = -1; /* forget any previous mds hint */
1923 if (req->r_request_started == 0) /* note request start time */
1924 req->r_request_started = jiffies;
1926 err = __prepare_send_request(mdsc, req, mds);
1928 ceph_msg_get(req->r_request);
1929 ceph_con_send(&session->s_con, req->r_request);
1933 ceph_put_mds_session(session);
1939 complete_request(mdsc, req);
1944 * called under mdsc->mutex
1946 static void __wake_requests(struct ceph_mds_client *mdsc,
1947 struct list_head *head)
1949 struct ceph_mds_request *req;
1950 LIST_HEAD(tmp_list);
1952 list_splice_init(head, &tmp_list);
1954 while (!list_empty(&tmp_list)) {
1955 req = list_entry(tmp_list.next,
1956 struct ceph_mds_request, r_wait);
1957 list_del_init(&req->r_wait);
1958 dout(" wake request %p tid %llu\n", req, req->r_tid);
1959 __do_request(mdsc, req);
1964 * Wake up threads with requests pending for @mds, so that they can
1965 * resubmit their requests to a possibly different mds.
1967 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1969 struct ceph_mds_request *req;
1972 dout("kick_requests mds%d\n", mds);
1973 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1974 req = rb_entry(p, struct ceph_mds_request, r_node);
1975 if (req->r_got_unsafe)
1977 if (req->r_session &&
1978 req->r_session->s_mds == mds) {
1979 dout(" kicking tid %llu\n", req->r_tid);
1980 __do_request(mdsc, req);
1985 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1986 struct ceph_mds_request *req)
1988 dout("submit_request on %p\n", req);
1989 mutex_lock(&mdsc->mutex);
1990 __register_request(mdsc, req, NULL);
1991 __do_request(mdsc, req);
1992 mutex_unlock(&mdsc->mutex);
1996 * Synchrously perform an mds request. Take care of all of the
1997 * session setup, forwarding, retry details.
1999 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2001 struct ceph_mds_request *req)
2005 dout("do_request on %p\n", req);
2007 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2009 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2010 if (req->r_locked_dir)
2011 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2012 if (req->r_old_dentry)
2013 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2017 mutex_lock(&mdsc->mutex);
2018 __register_request(mdsc, req, dir);
2019 __do_request(mdsc, req);
2023 __unregister_request(mdsc, req);
2024 dout("do_request early error %d\n", err);
2029 mutex_unlock(&mdsc->mutex);
2030 dout("do_request waiting\n");
2031 if (req->r_timeout) {
2032 err = (long)wait_for_completion_killable_timeout(
2033 &req->r_completion, req->r_timeout);
2037 err = wait_for_completion_killable(&req->r_completion);
2039 dout("do_request waited, got %d\n", err);
2040 mutex_lock(&mdsc->mutex);
2042 /* only abort if we didn't race with a real reply */
2043 if (req->r_got_result) {
2044 err = le32_to_cpu(req->r_reply_info.head->result);
2045 } else if (err < 0) {
2046 dout("aborted request %lld with %d\n", req->r_tid, err);
2049 * ensure we aren't running concurrently with
2050 * ceph_fill_trace or ceph_readdir_prepopulate, which
2051 * rely on locks (dir mutex) held by our caller.
2053 mutex_lock(&req->r_fill_mutex);
2055 req->r_aborted = true;
2056 mutex_unlock(&req->r_fill_mutex);
2058 if (req->r_locked_dir &&
2059 (req->r_op & CEPH_MDS_OP_WRITE))
2060 ceph_invalidate_dir_request(req);
2066 mutex_unlock(&mdsc->mutex);
2067 dout("do_request %p done, result %d\n", req, err);
2072 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2073 * namespace request.
2075 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2077 struct inode *inode = req->r_locked_dir;
2079 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2081 ceph_dir_clear_complete(inode);
2083 ceph_invalidate_dentry_lease(req->r_dentry);
2084 if (req->r_old_dentry)
2085 ceph_invalidate_dentry_lease(req->r_old_dentry);
2091 * We take the session mutex and parse and process the reply immediately.
2092 * This preserves the logical ordering of replies, capabilities, etc., sent
2093 * by the MDS as they are applied to our local cache.
2095 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2097 struct ceph_mds_client *mdsc = session->s_mdsc;
2098 struct ceph_mds_request *req;
2099 struct ceph_mds_reply_head *head = msg->front.iov_base;
2100 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2103 int mds = session->s_mds;
2105 if (msg->front.iov_len < sizeof(*head)) {
2106 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2111 /* get request, session */
2112 tid = le64_to_cpu(msg->hdr.tid);
2113 mutex_lock(&mdsc->mutex);
2114 req = __lookup_request(mdsc, tid);
2116 dout("handle_reply on unknown tid %llu\n", tid);
2117 mutex_unlock(&mdsc->mutex);
2120 dout("handle_reply %p\n", req);
2122 /* correct session? */
2123 if (req->r_session != session) {
2124 pr_err("mdsc_handle_reply got %llu on session mds%d"
2125 " not mds%d\n", tid, session->s_mds,
2126 req->r_session ? req->r_session->s_mds : -1);
2127 mutex_unlock(&mdsc->mutex);
2132 if ((req->r_got_unsafe && !head->safe) ||
2133 (req->r_got_safe && head->safe)) {
2134 pr_warning("got a dup %s reply on %llu from mds%d\n",
2135 head->safe ? "safe" : "unsafe", tid, mds);
2136 mutex_unlock(&mdsc->mutex);
2139 if (req->r_got_safe && !head->safe) {
2140 pr_warning("got unsafe after safe on %llu from mds%d\n",
2142 mutex_unlock(&mdsc->mutex);
2146 result = le32_to_cpu(head->result);
2150 * if we're not talking to the authority, send to them
2151 * if the authority has changed while we weren't looking,
2152 * send to new authority
2153 * Otherwise we just have to return an ESTALE
2155 if (result == -ESTALE) {
2156 dout("got ESTALE on request %llu", req->r_tid);
2157 if (!req->r_inode) {
2158 /* do nothing; not an authority problem */
2159 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2160 dout("not using auth, setting for that now");
2161 req->r_direct_mode = USE_AUTH_MDS;
2162 __do_request(mdsc, req);
2163 mutex_unlock(&mdsc->mutex);
2166 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2167 struct ceph_cap *cap = NULL;
2170 cap = ceph_get_cap_for_mds(ci,
2171 req->r_session->s_mds);
2173 dout("already using auth");
2174 if ((!cap || cap != ci->i_auth_cap) ||
2175 (cap->mseq != req->r_sent_on_mseq)) {
2176 dout("but cap changed, so resending");
2177 __do_request(mdsc, req);
2178 mutex_unlock(&mdsc->mutex);
2182 dout("have to return ESTALE on request %llu", req->r_tid);
2187 req->r_got_safe = true;
2188 __unregister_request(mdsc, req);
2189 complete_all(&req->r_safe_completion);
2191 if (req->r_got_unsafe) {
2193 * We already handled the unsafe response, now do the
2194 * cleanup. No need to examine the response; the MDS
2195 * doesn't include any result info in the safe
2196 * response. And even if it did, there is nothing
2197 * useful we could do with a revised return value.
2199 dout("got safe reply %llu, mds%d\n", tid, mds);
2200 list_del_init(&req->r_unsafe_item);
2202 /* last unsafe request during umount? */
2203 if (mdsc->stopping && !__get_oldest_req(mdsc))
2204 complete_all(&mdsc->safe_umount_waiters);
2205 mutex_unlock(&mdsc->mutex);
2209 req->r_got_unsafe = true;
2210 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2213 dout("handle_reply tid %lld result %d\n", tid, result);
2214 rinfo = &req->r_reply_info;
2215 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2216 mutex_unlock(&mdsc->mutex);
2218 mutex_lock(&session->s_mutex);
2220 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2226 if (rinfo->snapblob_len) {
2227 down_write(&mdsc->snap_rwsem);
2228 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2229 rinfo->snapblob + rinfo->snapblob_len,
2230 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2231 downgrade_write(&mdsc->snap_rwsem);
2233 down_read(&mdsc->snap_rwsem);
2236 /* insert trace into our cache */
2237 mutex_lock(&req->r_fill_mutex);
2238 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2240 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2241 req->r_op == CEPH_MDS_OP_LSSNAP))
2242 ceph_readdir_prepopulate(req, req->r_session);
2243 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2245 mutex_unlock(&req->r_fill_mutex);
2247 up_read(&mdsc->snap_rwsem);
2249 mutex_lock(&mdsc->mutex);
2250 if (!req->r_aborted) {
2256 req->r_got_result = true;
2259 dout("reply arrived after request %lld was aborted\n", tid);
2261 mutex_unlock(&mdsc->mutex);
2263 ceph_add_cap_releases(mdsc, req->r_session);
2264 mutex_unlock(&session->s_mutex);
2266 /* kick calling process */
2267 complete_request(mdsc, req);
2269 ceph_mdsc_put_request(req);
2276 * handle mds notification that our request has been forwarded.
2278 static void handle_forward(struct ceph_mds_client *mdsc,
2279 struct ceph_mds_session *session,
2280 struct ceph_msg *msg)
2282 struct ceph_mds_request *req;
2283 u64 tid = le64_to_cpu(msg->hdr.tid);
2287 void *p = msg->front.iov_base;
2288 void *end = p + msg->front.iov_len;
2290 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2291 next_mds = ceph_decode_32(&p);
2292 fwd_seq = ceph_decode_32(&p);
2294 mutex_lock(&mdsc->mutex);
2295 req = __lookup_request(mdsc, tid);
2297 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2298 goto out; /* dup reply? */
2301 if (req->r_aborted) {
2302 dout("forward tid %llu aborted, unregistering\n", tid);
2303 __unregister_request(mdsc, req);
2304 } else if (fwd_seq <= req->r_num_fwd) {
2305 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2306 tid, next_mds, req->r_num_fwd, fwd_seq);
2308 /* resend. forward race not possible; mds would drop */
2309 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2311 BUG_ON(req->r_got_result);
2312 req->r_num_fwd = fwd_seq;
2313 req->r_resend_mds = next_mds;
2314 put_request_session(req);
2315 __do_request(mdsc, req);
2317 ceph_mdsc_put_request(req);
2319 mutex_unlock(&mdsc->mutex);
2323 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2327 * handle a mds session control message
2329 static void handle_session(struct ceph_mds_session *session,
2330 struct ceph_msg *msg)
2332 struct ceph_mds_client *mdsc = session->s_mdsc;
2335 int mds = session->s_mds;
2336 struct ceph_mds_session_head *h = msg->front.iov_base;
2340 if (msg->front.iov_len != sizeof(*h))
2342 op = le32_to_cpu(h->op);
2343 seq = le64_to_cpu(h->seq);
2345 mutex_lock(&mdsc->mutex);
2346 if (op == CEPH_SESSION_CLOSE)
2347 __unregister_session(mdsc, session);
2348 /* FIXME: this ttl calculation is generous */
2349 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2350 mutex_unlock(&mdsc->mutex);
2352 mutex_lock(&session->s_mutex);
2354 dout("handle_session mds%d %s %p state %s seq %llu\n",
2355 mds, ceph_session_op_name(op), session,
2356 session_state_name(session->s_state), seq);
2358 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2359 session->s_state = CEPH_MDS_SESSION_OPEN;
2360 pr_info("mds%d came back\n", session->s_mds);
2364 case CEPH_SESSION_OPEN:
2365 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2366 pr_info("mds%d reconnect success\n", session->s_mds);
2367 session->s_state = CEPH_MDS_SESSION_OPEN;
2368 renewed_caps(mdsc, session, 0);
2371 __close_session(mdsc, session);
2374 case CEPH_SESSION_RENEWCAPS:
2375 if (session->s_renew_seq == seq)
2376 renewed_caps(mdsc, session, 1);
2379 case CEPH_SESSION_CLOSE:
2380 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2381 pr_info("mds%d reconnect denied\n", session->s_mds);
2382 remove_session_caps(session);
2383 wake = 1; /* for good measure */
2384 wake_up_all(&mdsc->session_close_wq);
2385 kick_requests(mdsc, mds);
2388 case CEPH_SESSION_STALE:
2389 pr_info("mds%d caps went stale, renewing\n",
2391 spin_lock(&session->s_gen_ttl_lock);
2392 session->s_cap_gen++;
2393 session->s_cap_ttl = jiffies - 1;
2394 spin_unlock(&session->s_gen_ttl_lock);
2395 send_renew_caps(mdsc, session);
2398 case CEPH_SESSION_RECALL_STATE:
2399 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2403 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2407 mutex_unlock(&session->s_mutex);
2409 mutex_lock(&mdsc->mutex);
2410 __wake_requests(mdsc, &session->s_waiting);
2411 mutex_unlock(&mdsc->mutex);
2416 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2417 (int)msg->front.iov_len);
2424 * called under session->mutex.
2426 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2427 struct ceph_mds_session *session)
2429 struct ceph_mds_request *req, *nreq;
2432 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2434 mutex_lock(&mdsc->mutex);
2435 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2436 err = __prepare_send_request(mdsc, req, session->s_mds);
2438 ceph_msg_get(req->r_request);
2439 ceph_con_send(&session->s_con, req->r_request);
2442 mutex_unlock(&mdsc->mutex);
2446 * Encode information about a cap for a reconnect with the MDS.
2448 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2452 struct ceph_mds_cap_reconnect v2;
2453 struct ceph_mds_cap_reconnect_v1 v1;
2456 struct ceph_inode_info *ci;
2457 struct ceph_reconnect_state *recon_state = arg;
2458 struct ceph_pagelist *pagelist = recon_state->pagelist;
2462 struct dentry *dentry;
2466 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2467 inode, ceph_vinop(inode), cap, cap->cap_id,
2468 ceph_cap_string(cap->issued));
2469 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2473 dentry = d_find_alias(inode);
2475 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2477 err = PTR_ERR(path);
2484 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2488 spin_lock(&ci->i_ceph_lock);
2489 cap->seq = 0; /* reset cap seq */
2490 cap->issue_seq = 0; /* and issue_seq */
2491 cap->mseq = 0; /* and migrate_seq */
2493 if (recon_state->flock) {
2494 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2495 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2496 rec.v2.issued = cpu_to_le32(cap->issued);
2497 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2498 rec.v2.pathbase = cpu_to_le64(pathbase);
2499 rec.v2.flock_len = 0;
2500 reclen = sizeof(rec.v2);
2502 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2503 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2504 rec.v1.issued = cpu_to_le32(cap->issued);
2505 rec.v1.size = cpu_to_le64(inode->i_size);
2506 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2507 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2508 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2509 rec.v1.pathbase = cpu_to_le64(pathbase);
2510 reclen = sizeof(rec.v1);
2512 spin_unlock(&ci->i_ceph_lock);
2514 if (recon_state->flock) {
2515 int num_fcntl_locks, num_flock_locks;
2516 struct ceph_filelock *flocks;
2519 spin_lock(&inode->i_lock);
2520 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2521 spin_unlock(&inode->i_lock);
2522 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2523 sizeof(struct ceph_filelock), GFP_NOFS);
2528 spin_lock(&inode->i_lock);
2529 err = ceph_encode_locks_to_buffer(inode, flocks,
2532 spin_unlock(&inode->i_lock);
2540 * number of encoded locks is stable, so copy to pagelist
2542 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2543 (num_fcntl_locks+num_flock_locks) *
2544 sizeof(struct ceph_filelock));
2545 err = ceph_pagelist_append(pagelist, &rec, reclen);
2547 err = ceph_locks_to_pagelist(flocks, pagelist,
2552 err = ceph_pagelist_append(pagelist, &rec, reclen);
2563 * If an MDS fails and recovers, clients need to reconnect in order to
2564 * reestablish shared state. This includes all caps issued through
2565 * this session _and_ the snap_realm hierarchy. Because it's not
2566 * clear which snap realms the mds cares about, we send everything we
2567 * know about.. that ensures we'll then get any new info the
2568 * recovering MDS might have.
2570 * This is a relatively heavyweight operation, but it's rare.
2572 * called with mdsc->mutex held.
2574 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2575 struct ceph_mds_session *session)
2577 struct ceph_msg *reply;
2579 int mds = session->s_mds;
2581 struct ceph_pagelist *pagelist;
2582 struct ceph_reconnect_state recon_state;
2584 pr_info("mds%d reconnect start\n", mds);
2586 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2588 goto fail_nopagelist;
2589 ceph_pagelist_init(pagelist);
2591 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2595 mutex_lock(&session->s_mutex);
2596 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2599 ceph_con_close(&session->s_con);
2600 ceph_con_open(&session->s_con,
2601 CEPH_ENTITY_TYPE_MDS, mds,
2602 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2604 /* replay unsafe requests */
2605 replay_unsafe_requests(mdsc, session);
2607 down_read(&mdsc->snap_rwsem);
2609 dout("session %p state %s\n", session,
2610 session_state_name(session->s_state));
2612 /* drop old cap expires; we're about to reestablish that state */
2613 discard_cap_releases(mdsc, session);
2615 /* traverse this session's caps */
2616 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2620 recon_state.pagelist = pagelist;
2621 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2622 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2627 * snaprealms. we provide mds with the ino, seq (version), and
2628 * parent for all of our realms. If the mds has any newer info,
2631 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2632 struct ceph_snap_realm *realm =
2633 rb_entry(p, struct ceph_snap_realm, node);
2634 struct ceph_mds_snaprealm_reconnect sr_rec;
2636 dout(" adding snap realm %llx seq %lld parent %llx\n",
2637 realm->ino, realm->seq, realm->parent_ino);
2638 sr_rec.ino = cpu_to_le64(realm->ino);
2639 sr_rec.seq = cpu_to_le64(realm->seq);
2640 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2641 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2646 if (recon_state.flock)
2647 reply->hdr.version = cpu_to_le16(2);
2648 if (pagelist->length) {
2649 /* set up outbound data if we have any */
2650 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2651 ceph_msg_data_add_pagelist(reply, pagelist);
2653 ceph_con_send(&session->s_con, reply);
2655 mutex_unlock(&session->s_mutex);
2657 mutex_lock(&mdsc->mutex);
2658 __wake_requests(mdsc, &session->s_waiting);
2659 mutex_unlock(&mdsc->mutex);
2661 up_read(&mdsc->snap_rwsem);
2665 ceph_msg_put(reply);
2666 up_read(&mdsc->snap_rwsem);
2667 mutex_unlock(&session->s_mutex);
2669 ceph_pagelist_release(pagelist);
2672 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2678 * compare old and new mdsmaps, kicking requests
2679 * and closing out old connections as necessary
2681 * called under mdsc->mutex.
2683 static void check_new_map(struct ceph_mds_client *mdsc,
2684 struct ceph_mdsmap *newmap,
2685 struct ceph_mdsmap *oldmap)
2688 int oldstate, newstate;
2689 struct ceph_mds_session *s;
2691 dout("check_new_map new %u old %u\n",
2692 newmap->m_epoch, oldmap->m_epoch);
2694 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2695 if (mdsc->sessions[i] == NULL)
2697 s = mdsc->sessions[i];
2698 oldstate = ceph_mdsmap_get_state(oldmap, i);
2699 newstate = ceph_mdsmap_get_state(newmap, i);
2701 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2702 i, ceph_mds_state_name(oldstate),
2703 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2704 ceph_mds_state_name(newstate),
2705 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2706 session_state_name(s->s_state));
2708 if (i >= newmap->m_max_mds ||
2709 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2710 ceph_mdsmap_get_addr(newmap, i),
2711 sizeof(struct ceph_entity_addr))) {
2712 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2713 /* the session never opened, just close it
2715 __wake_requests(mdsc, &s->s_waiting);
2716 __unregister_session(mdsc, s);
2719 mutex_unlock(&mdsc->mutex);
2720 mutex_lock(&s->s_mutex);
2721 mutex_lock(&mdsc->mutex);
2722 ceph_con_close(&s->s_con);
2723 mutex_unlock(&s->s_mutex);
2724 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2727 /* kick any requests waiting on the recovering mds */
2728 kick_requests(mdsc, i);
2729 } else if (oldstate == newstate) {
2730 continue; /* nothing new with this mds */
2736 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2737 newstate >= CEPH_MDS_STATE_RECONNECT) {
2738 mutex_unlock(&mdsc->mutex);
2739 send_mds_reconnect(mdsc, s);
2740 mutex_lock(&mdsc->mutex);
2744 * kick request on any mds that has gone active.
2746 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2747 newstate >= CEPH_MDS_STATE_ACTIVE) {
2748 if (oldstate != CEPH_MDS_STATE_CREATING &&
2749 oldstate != CEPH_MDS_STATE_STARTING)
2750 pr_info("mds%d recovery completed\n", s->s_mds);
2751 kick_requests(mdsc, i);
2752 ceph_kick_flushing_caps(mdsc, s);
2753 wake_up_session_caps(s, 1);
2757 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2758 s = mdsc->sessions[i];
2761 if (!ceph_mdsmap_is_laggy(newmap, i))
2763 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2764 s->s_state == CEPH_MDS_SESSION_HUNG ||
2765 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2766 dout(" connecting to export targets of laggy mds%d\n",
2768 __open_export_target_sessions(mdsc, s);
2780 * caller must hold session s_mutex, dentry->d_lock
2782 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2784 struct ceph_dentry_info *di = ceph_dentry(dentry);
2786 ceph_put_mds_session(di->lease_session);
2787 di->lease_session = NULL;
2790 static void handle_lease(struct ceph_mds_client *mdsc,
2791 struct ceph_mds_session *session,
2792 struct ceph_msg *msg)
2794 struct super_block *sb = mdsc->fsc->sb;
2795 struct inode *inode;
2796 struct dentry *parent, *dentry;
2797 struct ceph_dentry_info *di;
2798 int mds = session->s_mds;
2799 struct ceph_mds_lease *h = msg->front.iov_base;
2801 struct ceph_vino vino;
2805 dout("handle_lease from mds%d\n", mds);
2808 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2810 vino.ino = le64_to_cpu(h->ino);
2811 vino.snap = CEPH_NOSNAP;
2812 seq = le32_to_cpu(h->seq);
2813 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2814 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2815 if (dname.len != get_unaligned_le32(h+1))
2818 mutex_lock(&session->s_mutex);
2822 inode = ceph_find_inode(sb, vino);
2823 dout("handle_lease %s, ino %llx %p %.*s\n",
2824 ceph_lease_op_name(h->action), vino.ino, inode,
2825 dname.len, dname.name);
2826 if (inode == NULL) {
2827 dout("handle_lease no inode %llx\n", vino.ino);
2832 parent = d_find_alias(inode);
2834 dout("no parent dentry on inode %p\n", inode);
2836 goto release; /* hrm... */
2838 dname.hash = full_name_hash(dname.name, dname.len);
2839 dentry = d_lookup(parent, &dname);
2844 spin_lock(&dentry->d_lock);
2845 di = ceph_dentry(dentry);
2846 switch (h->action) {
2847 case CEPH_MDS_LEASE_REVOKE:
2848 if (di->lease_session == session) {
2849 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2850 h->seq = cpu_to_le32(di->lease_seq);
2851 __ceph_mdsc_drop_dentry_lease(dentry);
2856 case CEPH_MDS_LEASE_RENEW:
2857 if (di->lease_session == session &&
2858 di->lease_gen == session->s_cap_gen &&
2859 di->lease_renew_from &&
2860 di->lease_renew_after == 0) {
2861 unsigned long duration =
2862 le32_to_cpu(h->duration_ms) * HZ / 1000;
2864 di->lease_seq = seq;
2865 dentry->d_time = di->lease_renew_from + duration;
2866 di->lease_renew_after = di->lease_renew_from +
2868 di->lease_renew_from = 0;
2872 spin_unlock(&dentry->d_lock);
2879 /* let's just reuse the same message */
2880 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2882 ceph_con_send(&session->s_con, msg);
2886 mutex_unlock(&session->s_mutex);
2890 pr_err("corrupt lease message\n");
2894 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2895 struct inode *inode,
2896 struct dentry *dentry, char action,
2899 struct ceph_msg *msg;
2900 struct ceph_mds_lease *lease;
2901 int len = sizeof(*lease) + sizeof(u32);
2904 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2905 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2906 dnamelen = dentry->d_name.len;
2909 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2912 lease = msg->front.iov_base;
2913 lease->action = action;
2914 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2915 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2916 lease->seq = cpu_to_le32(seq);
2917 put_unaligned_le32(dnamelen, lease + 1);
2918 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2921 * if this is a preemptive lease RELEASE, no need to
2922 * flush request stream, since the actual request will
2925 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2927 ceph_con_send(&session->s_con, msg);
2931 * Preemptively release a lease we expect to invalidate anyway.
2932 * Pass @inode always, @dentry is optional.
2934 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2935 struct dentry *dentry)
2937 struct ceph_dentry_info *di;
2938 struct ceph_mds_session *session;
2941 BUG_ON(inode == NULL);
2942 BUG_ON(dentry == NULL);
2944 /* is dentry lease valid? */
2945 spin_lock(&dentry->d_lock);
2946 di = ceph_dentry(dentry);
2947 if (!di || !di->lease_session ||
2948 di->lease_session->s_mds < 0 ||
2949 di->lease_gen != di->lease_session->s_cap_gen ||
2950 !time_before(jiffies, dentry->d_time)) {
2951 dout("lease_release inode %p dentry %p -- "
2954 spin_unlock(&dentry->d_lock);
2958 /* we do have a lease on this dentry; note mds and seq */
2959 session = ceph_get_mds_session(di->lease_session);
2960 seq = di->lease_seq;
2961 __ceph_mdsc_drop_dentry_lease(dentry);
2962 spin_unlock(&dentry->d_lock);
2964 dout("lease_release inode %p dentry %p to mds%d\n",
2965 inode, dentry, session->s_mds);
2966 ceph_mdsc_lease_send_msg(session, inode, dentry,
2967 CEPH_MDS_LEASE_RELEASE, seq);
2968 ceph_put_mds_session(session);
2972 * drop all leases (and dentry refs) in preparation for umount
2974 static void drop_leases(struct ceph_mds_client *mdsc)
2978 dout("drop_leases\n");
2979 mutex_lock(&mdsc->mutex);
2980 for (i = 0; i < mdsc->max_sessions; i++) {
2981 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2984 mutex_unlock(&mdsc->mutex);
2985 mutex_lock(&s->s_mutex);
2986 mutex_unlock(&s->s_mutex);
2987 ceph_put_mds_session(s);
2988 mutex_lock(&mdsc->mutex);
2990 mutex_unlock(&mdsc->mutex);
2996 * delayed work -- periodically trim expired leases, renew caps with mds
2998 static void schedule_delayed(struct ceph_mds_client *mdsc)
3001 unsigned hz = round_jiffies_relative(HZ * delay);
3002 schedule_delayed_work(&mdsc->delayed_work, hz);
3005 static void delayed_work(struct work_struct *work)
3008 struct ceph_mds_client *mdsc =
3009 container_of(work, struct ceph_mds_client, delayed_work.work);
3013 dout("mdsc delayed_work\n");
3014 ceph_check_delayed_caps(mdsc);
3016 mutex_lock(&mdsc->mutex);
3017 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3018 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3019 mdsc->last_renew_caps);
3021 mdsc->last_renew_caps = jiffies;
3023 for (i = 0; i < mdsc->max_sessions; i++) {
3024 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3027 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3028 dout("resending session close request for mds%d\n",
3030 request_close_session(mdsc, s);
3031 ceph_put_mds_session(s);
3034 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3035 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3036 s->s_state = CEPH_MDS_SESSION_HUNG;
3037 pr_info("mds%d hung\n", s->s_mds);
3040 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3041 /* this mds is failed or recovering, just wait */
3042 ceph_put_mds_session(s);
3045 mutex_unlock(&mdsc->mutex);
3047 mutex_lock(&s->s_mutex);
3049 send_renew_caps(mdsc, s);
3051 ceph_con_keepalive(&s->s_con);
3052 ceph_add_cap_releases(mdsc, s);
3053 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3054 s->s_state == CEPH_MDS_SESSION_HUNG)
3055 ceph_send_cap_releases(mdsc, s);
3056 mutex_unlock(&s->s_mutex);
3057 ceph_put_mds_session(s);
3059 mutex_lock(&mdsc->mutex);
3061 mutex_unlock(&mdsc->mutex);
3063 schedule_delayed(mdsc);
3066 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3069 struct ceph_mds_client *mdsc;
3071 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3076 mutex_init(&mdsc->mutex);
3077 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3078 if (mdsc->mdsmap == NULL) {
3083 init_completion(&mdsc->safe_umount_waiters);
3084 init_waitqueue_head(&mdsc->session_close_wq);
3085 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3086 mdsc->sessions = NULL;
3087 mdsc->max_sessions = 0;
3089 init_rwsem(&mdsc->snap_rwsem);
3090 mdsc->snap_realms = RB_ROOT;
3091 INIT_LIST_HEAD(&mdsc->snap_empty);
3092 spin_lock_init(&mdsc->snap_empty_lock);
3094 mdsc->request_tree = RB_ROOT;
3095 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3096 mdsc->last_renew_caps = jiffies;
3097 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3098 spin_lock_init(&mdsc->cap_delay_lock);
3099 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3100 spin_lock_init(&mdsc->snap_flush_lock);
3101 mdsc->cap_flush_seq = 0;
3102 INIT_LIST_HEAD(&mdsc->cap_dirty);
3103 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3104 mdsc->num_cap_flushing = 0;
3105 spin_lock_init(&mdsc->cap_dirty_lock);
3106 init_waitqueue_head(&mdsc->cap_flushing_wq);
3107 spin_lock_init(&mdsc->dentry_lru_lock);
3108 INIT_LIST_HEAD(&mdsc->dentry_lru);
3110 ceph_caps_init(mdsc);
3111 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3117 * Wait for safe replies on open mds requests. If we time out, drop
3118 * all requests from the tree to avoid dangling dentry refs.
3120 static void wait_requests(struct ceph_mds_client *mdsc)
3122 struct ceph_mds_request *req;
3123 struct ceph_fs_client *fsc = mdsc->fsc;
3125 mutex_lock(&mdsc->mutex);
3126 if (__get_oldest_req(mdsc)) {
3127 mutex_unlock(&mdsc->mutex);
3129 dout("wait_requests waiting for requests\n");
3130 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3131 fsc->client->options->mount_timeout * HZ);
3133 /* tear down remaining requests */
3134 mutex_lock(&mdsc->mutex);
3135 while ((req = __get_oldest_req(mdsc))) {
3136 dout("wait_requests timed out on tid %llu\n",
3138 __unregister_request(mdsc, req);
3141 mutex_unlock(&mdsc->mutex);
3142 dout("wait_requests done\n");
3146 * called before mount is ro, and before dentries are torn down.
3147 * (hmm, does this still race with new lookups?)
3149 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3151 dout("pre_umount\n");
3155 ceph_flush_dirty_caps(mdsc);
3156 wait_requests(mdsc);
3159 * wait for reply handlers to drop their request refs and
3160 * their inode/dcache refs
3166 * wait for all write mds requests to flush.
3168 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3170 struct ceph_mds_request *req = NULL, *nextreq;
3173 mutex_lock(&mdsc->mutex);
3174 dout("wait_unsafe_requests want %lld\n", want_tid);
3176 req = __get_oldest_req(mdsc);
3177 while (req && req->r_tid <= want_tid) {
3178 /* find next request */
3179 n = rb_next(&req->r_node);
3181 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3184 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3186 ceph_mdsc_get_request(req);
3188 ceph_mdsc_get_request(nextreq);
3189 mutex_unlock(&mdsc->mutex);
3190 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3191 req->r_tid, want_tid);
3192 wait_for_completion(&req->r_safe_completion);
3193 mutex_lock(&mdsc->mutex);
3194 ceph_mdsc_put_request(req);
3196 break; /* next dne before, so we're done! */
3197 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3198 /* next request was removed from tree */
3199 ceph_mdsc_put_request(nextreq);
3202 ceph_mdsc_put_request(nextreq); /* won't go away */
3206 mutex_unlock(&mdsc->mutex);
3207 dout("wait_unsafe_requests done\n");
3210 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3212 u64 want_tid, want_flush;
3214 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3218 mutex_lock(&mdsc->mutex);
3219 want_tid = mdsc->last_tid;
3220 want_flush = mdsc->cap_flush_seq;
3221 mutex_unlock(&mdsc->mutex);
3222 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3224 ceph_flush_dirty_caps(mdsc);
3226 wait_unsafe_requests(mdsc, want_tid);
3227 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3231 * true if all sessions are closed, or we force unmount
3233 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3237 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3240 mutex_lock(&mdsc->mutex);
3241 for (i = 0; i < mdsc->max_sessions; i++)
3242 if (mdsc->sessions[i])
3244 mutex_unlock(&mdsc->mutex);
3249 * called after sb is ro.
3251 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3253 struct ceph_mds_session *session;
3255 struct ceph_fs_client *fsc = mdsc->fsc;
3256 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3258 dout("close_sessions\n");
3260 /* close sessions */
3261 mutex_lock(&mdsc->mutex);
3262 for (i = 0; i < mdsc->max_sessions; i++) {
3263 session = __ceph_lookup_mds_session(mdsc, i);
3266 mutex_unlock(&mdsc->mutex);
3267 mutex_lock(&session->s_mutex);
3268 __close_session(mdsc, session);
3269 mutex_unlock(&session->s_mutex);
3270 ceph_put_mds_session(session);
3271 mutex_lock(&mdsc->mutex);
3273 mutex_unlock(&mdsc->mutex);
3275 dout("waiting for sessions to close\n");
3276 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3279 /* tear down remaining sessions */
3280 mutex_lock(&mdsc->mutex);
3281 for (i = 0; i < mdsc->max_sessions; i++) {
3282 if (mdsc->sessions[i]) {
3283 session = get_session(mdsc->sessions[i]);
3284 __unregister_session(mdsc, session);
3285 mutex_unlock(&mdsc->mutex);
3286 mutex_lock(&session->s_mutex);
3287 remove_session_caps(session);
3288 mutex_unlock(&session->s_mutex);
3289 ceph_put_mds_session(session);
3290 mutex_lock(&mdsc->mutex);
3293 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3294 mutex_unlock(&mdsc->mutex);
3296 ceph_cleanup_empty_realms(mdsc);
3298 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3303 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3306 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3308 ceph_mdsmap_destroy(mdsc->mdsmap);
3309 kfree(mdsc->sessions);
3310 ceph_caps_finalize(mdsc);
3313 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3315 struct ceph_mds_client *mdsc = fsc->mdsc;
3317 dout("mdsc_destroy %p\n", mdsc);
3318 ceph_mdsc_stop(mdsc);
3320 /* flush out any connection work with references to us */
3325 dout("mdsc_destroy %p done\n", mdsc);
3330 * handle mds map update.
3332 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3336 void *p = msg->front.iov_base;
3337 void *end = p + msg->front.iov_len;
3338 struct ceph_mdsmap *newmap, *oldmap;
3339 struct ceph_fsid fsid;
3342 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3343 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3344 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3346 epoch = ceph_decode_32(&p);
3347 maplen = ceph_decode_32(&p);
3348 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3350 /* do we need it? */
3351 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3352 mutex_lock(&mdsc->mutex);
3353 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3354 dout("handle_map epoch %u <= our %u\n",
3355 epoch, mdsc->mdsmap->m_epoch);
3356 mutex_unlock(&mdsc->mutex);
3360 newmap = ceph_mdsmap_decode(&p, end);
3361 if (IS_ERR(newmap)) {
3362 err = PTR_ERR(newmap);
3366 /* swap into place */
3368 oldmap = mdsc->mdsmap;
3369 mdsc->mdsmap = newmap;
3370 check_new_map(mdsc, newmap, oldmap);
3371 ceph_mdsmap_destroy(oldmap);
3373 mdsc->mdsmap = newmap; /* first mds map */
3375 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3377 __wake_requests(mdsc, &mdsc->waiting_for_map);
3379 mutex_unlock(&mdsc->mutex);
3380 schedule_delayed(mdsc);
3384 mutex_unlock(&mdsc->mutex);
3386 pr_err("error decoding mdsmap %d\n", err);
3390 static struct ceph_connection *con_get(struct ceph_connection *con)
3392 struct ceph_mds_session *s = con->private;
3394 if (get_session(s)) {
3395 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3398 dout("mdsc con_get %p FAIL\n", s);
3402 static void con_put(struct ceph_connection *con)
3404 struct ceph_mds_session *s = con->private;
3406 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3407 ceph_put_mds_session(s);
3411 * if the client is unresponsive for long enough, the mds will kill
3412 * the session entirely.
3414 static void peer_reset(struct ceph_connection *con)
3416 struct ceph_mds_session *s = con->private;
3417 struct ceph_mds_client *mdsc = s->s_mdsc;
3419 pr_warning("mds%d closed our session\n", s->s_mds);
3420 send_mds_reconnect(mdsc, s);
3423 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3425 struct ceph_mds_session *s = con->private;
3426 struct ceph_mds_client *mdsc = s->s_mdsc;
3427 int type = le16_to_cpu(msg->hdr.type);
3429 mutex_lock(&mdsc->mutex);
3430 if (__verify_registered_session(mdsc, s) < 0) {
3431 mutex_unlock(&mdsc->mutex);
3434 mutex_unlock(&mdsc->mutex);
3437 case CEPH_MSG_MDS_MAP:
3438 ceph_mdsc_handle_map(mdsc, msg);
3440 case CEPH_MSG_CLIENT_SESSION:
3441 handle_session(s, msg);
3443 case CEPH_MSG_CLIENT_REPLY:
3444 handle_reply(s, msg);
3446 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3447 handle_forward(mdsc, s, msg);
3449 case CEPH_MSG_CLIENT_CAPS:
3450 ceph_handle_caps(s, msg);
3452 case CEPH_MSG_CLIENT_SNAP:
3453 ceph_handle_snap(mdsc, s, msg);
3455 case CEPH_MSG_CLIENT_LEASE:
3456 handle_lease(mdsc, s, msg);
3460 pr_err("received unknown message type %d %s\n", type,
3461 ceph_msg_type_name(type));
3472 * Note: returned pointer is the address of a structure that's
3473 * managed separately. Caller must *not* attempt to free it.
3475 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3476 int *proto, int force_new)
3478 struct ceph_mds_session *s = con->private;
3479 struct ceph_mds_client *mdsc = s->s_mdsc;
3480 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3481 struct ceph_auth_handshake *auth = &s->s_auth;
3483 if (force_new && auth->authorizer) {
3484 ceph_auth_destroy_authorizer(ac, auth->authorizer);
3485 auth->authorizer = NULL;
3487 if (!auth->authorizer) {
3488 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3491 return ERR_PTR(ret);
3493 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3496 return ERR_PTR(ret);
3498 *proto = ac->protocol;
3504 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3506 struct ceph_mds_session *s = con->private;
3507 struct ceph_mds_client *mdsc = s->s_mdsc;
3508 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3510 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3513 static int invalidate_authorizer(struct ceph_connection *con)
3515 struct ceph_mds_session *s = con->private;
3516 struct ceph_mds_client *mdsc = s->s_mdsc;
3517 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3519 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3521 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3524 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3525 struct ceph_msg_header *hdr, int *skip)
3527 struct ceph_msg *msg;
3528 int type = (int) le16_to_cpu(hdr->type);
3529 int front_len = (int) le32_to_cpu(hdr->front_len);
3535 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3537 pr_err("unable to allocate msg type %d len %d\n",
3545 static const struct ceph_connection_operations mds_con_ops = {
3548 .dispatch = dispatch,
3549 .get_authorizer = get_authorizer,
3550 .verify_authorizer_reply = verify_authorizer_reply,
3551 .invalidate_authorizer = invalidate_authorizer,
3552 .peer_reset = peer_reset,
3553 .alloc_msg = mds_alloc_msg,