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41 * are no longer valid.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)
68 *p += sizeof(struct ceph_mds_reply_inode) +
69 sizeof(*info->in->fragtree.splits) *
70 le32_to_cpu(info->in->fragtree.nsplits);
72 ceph_decode_32_safe(p, end, info->symlink_len, bad);
73 ceph_decode_need(p, end, info->symlink_len, bad);
75 *p += info->symlink_len;
77 ceph_decode_32_safe(p, end, info->xattr_len, bad);
78 ceph_decode_need(p, end, info->xattr_len, bad);
79 info->xattr_data = *p;
80 *p += info->xattr_len;
87 * parse a normal reply, which may contain a (dir+)dentry and/or a
90 static int parse_reply_info_trace(void **p, void *end,
91 struct ceph_mds_reply_info_parsed *info)
95 if (info->head->is_dentry) {
96 err = parse_reply_info_in(p, end, &info->diri);
100 if (unlikely(*p + sizeof(*info->dirfrag) > end))
103 *p += sizeof(*info->dirfrag) +
104 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
105 if (unlikely(*p > end))
108 ceph_decode_32_safe(p, end, info->dname_len, bad);
109 ceph_decode_need(p, end, info->dname_len, bad);
111 *p += info->dname_len;
113 *p += sizeof(*info->dlease);
116 if (info->head->is_target) {
117 err = parse_reply_info_in(p, end, &info->targeti);
122 if (unlikely(*p != end))
129 pr_err("problem parsing mds trace %d\n", err);
134 * parse readdir results
136 static int parse_reply_info_dir(void **p, void *end,
137 struct ceph_mds_reply_info_parsed *info)
143 if (*p + sizeof(*info->dir_dir) > end)
145 *p += sizeof(*info->dir_dir) +
146 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
150 ceph_decode_need(p, end, sizeof(num) + 2, bad);
151 num = ceph_decode_32(p);
152 info->dir_end = ceph_decode_8(p);
153 info->dir_complete = ceph_decode_8(p);
157 /* alloc large array */
159 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
160 sizeof(*info->dir_dname) +
161 sizeof(*info->dir_dname_len) +
162 sizeof(*info->dir_dlease),
164 if (info->dir_in == NULL) {
168 info->dir_dname = (void *)(info->dir_in + num);
169 info->dir_dname_len = (void *)(info->dir_dname + num);
170 info->dir_dlease = (void *)(info->dir_dname_len + num);
174 ceph_decode_need(p, end, sizeof(u32)*2, bad);
175 info->dir_dname_len[i] = ceph_decode_32(p);
176 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
177 info->dir_dname[i] = *p;
178 *p += info->dir_dname_len[i];
179 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
181 info->dir_dlease[i] = *p;
182 *p += sizeof(struct ceph_mds_reply_lease);
185 err = parse_reply_info_in(p, end, &info->dir_in[i]);
200 pr_err("problem parsing dir contents %d\n", err);
205 * parse fcntl F_GETLK results
207 static int parse_reply_info_filelock(void **p, void *end,
208 struct ceph_mds_reply_info_parsed *info)
210 if (*p + sizeof(*info->filelock_reply) > end)
213 info->filelock_reply = *p;
214 *p += sizeof(*info->filelock_reply);
216 if (unlikely(*p != end))
225 * parse extra results
227 static int parse_reply_info_extra(void **p, void *end,
228 struct ceph_mds_reply_info_parsed *info)
230 if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
231 return parse_reply_info_filelock(p, end, info);
233 return parse_reply_info_dir(p, end, info);
237 * parse entire mds reply
239 static int parse_reply_info(struct ceph_msg *msg,
240 struct ceph_mds_reply_info_parsed *info)
246 info->head = msg->front.iov_base;
247 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
248 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
251 ceph_decode_32_safe(&p, end, len, bad);
253 err = parse_reply_info_trace(&p, p+len, info);
259 ceph_decode_32_safe(&p, end, len, bad);
261 err = parse_reply_info_extra(&p, p+len, info);
267 ceph_decode_32_safe(&p, end, len, bad);
268 info->snapblob_len = len;
279 pr_err("mds parse_reply err %d\n", err);
283 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
292 static const char *session_state_name(int s)
295 case CEPH_MDS_SESSION_NEW: return "new";
296 case CEPH_MDS_SESSION_OPENING: return "opening";
297 case CEPH_MDS_SESSION_OPEN: return "open";
298 case CEPH_MDS_SESSION_HUNG: return "hung";
299 case CEPH_MDS_SESSION_CLOSING: return "closing";
300 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
301 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
302 default: return "???";
306 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
308 if (atomic_inc_not_zero(&s->s_ref)) {
309 dout("mdsc get_session %p %d -> %d\n", s,
310 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
313 dout("mdsc get_session %p 0 -- FAIL", s);
318 void ceph_put_mds_session(struct ceph_mds_session *s)
320 dout("mdsc put_session %p %d -> %d\n", s,
321 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
322 if (atomic_dec_and_test(&s->s_ref)) {
324 s->s_mdsc->fsc->client->monc.auth->ops->destroy_authorizer(
325 s->s_mdsc->fsc->client->monc.auth,
332 * called under mdsc->mutex
334 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
337 struct ceph_mds_session *session;
339 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
341 session = mdsc->sessions[mds];
342 dout("lookup_mds_session %p %d\n", session,
343 atomic_read(&session->s_ref));
344 get_session(session);
348 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
350 if (mds >= mdsc->max_sessions)
352 return mdsc->sessions[mds];
355 static int __verify_registered_session(struct ceph_mds_client *mdsc,
356 struct ceph_mds_session *s)
358 if (s->s_mds >= mdsc->max_sessions ||
359 mdsc->sessions[s->s_mds] != s)
365 * create+register a new session for given mds.
366 * called under mdsc->mutex.
368 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
371 struct ceph_mds_session *s;
373 s = kzalloc(sizeof(*s), GFP_NOFS);
375 return ERR_PTR(-ENOMEM);
378 s->s_state = CEPH_MDS_SESSION_NEW;
381 mutex_init(&s->s_mutex);
383 ceph_con_init(mdsc->fsc->client->msgr, &s->s_con);
384 s->s_con.private = s;
385 s->s_con.ops = &mds_con_ops;
386 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
387 s->s_con.peer_name.num = cpu_to_le64(mds);
389 spin_lock_init(&s->s_cap_lock);
392 s->s_renew_requested = 0;
394 INIT_LIST_HEAD(&s->s_caps);
397 atomic_set(&s->s_ref, 1);
398 INIT_LIST_HEAD(&s->s_waiting);
399 INIT_LIST_HEAD(&s->s_unsafe);
400 s->s_num_cap_releases = 0;
401 s->s_cap_iterator = NULL;
402 INIT_LIST_HEAD(&s->s_cap_releases);
403 INIT_LIST_HEAD(&s->s_cap_releases_done);
404 INIT_LIST_HEAD(&s->s_cap_flushing);
405 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
407 dout("register_session mds%d\n", mds);
408 if (mds >= mdsc->max_sessions) {
409 int newmax = 1 << get_count_order(mds+1);
410 struct ceph_mds_session **sa;
412 dout("register_session realloc to %d\n", newmax);
413 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
416 if (mdsc->sessions) {
417 memcpy(sa, mdsc->sessions,
418 mdsc->max_sessions * sizeof(void *));
419 kfree(mdsc->sessions);
422 mdsc->max_sessions = newmax;
424 mdsc->sessions[mds] = s;
425 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
427 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
433 return ERR_PTR(-ENOMEM);
437 * called under mdsc->mutex
439 static void __unregister_session(struct ceph_mds_client *mdsc,
440 struct ceph_mds_session *s)
442 dout("__unregister_session mds%d %p\n", s->s_mds, s);
443 BUG_ON(mdsc->sessions[s->s_mds] != s);
444 mdsc->sessions[s->s_mds] = NULL;
445 ceph_con_close(&s->s_con);
446 ceph_put_mds_session(s);
450 * drop session refs in request.
452 * should be last request ref, or hold mdsc->mutex
454 static void put_request_session(struct ceph_mds_request *req)
456 if (req->r_session) {
457 ceph_put_mds_session(req->r_session);
458 req->r_session = NULL;
462 void ceph_mdsc_release_request(struct kref *kref)
464 struct ceph_mds_request *req = container_of(kref,
465 struct ceph_mds_request,
468 ceph_msg_put(req->r_request);
470 ceph_msg_put(req->r_reply);
471 destroy_reply_info(&req->r_reply_info);
474 ceph_put_cap_refs(ceph_inode(req->r_inode),
478 if (req->r_locked_dir)
479 ceph_put_cap_refs(ceph_inode(req->r_locked_dir),
481 if (req->r_target_inode)
482 iput(req->r_target_inode);
485 if (req->r_old_dentry) {
487 ceph_inode(req->r_old_dentry->d_parent->d_inode),
489 dput(req->r_old_dentry);
493 put_request_session(req);
494 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
499 * lookup session, bump ref if found.
501 * called under mdsc->mutex.
503 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
506 struct ceph_mds_request *req;
507 struct rb_node *n = mdsc->request_tree.rb_node;
510 req = rb_entry(n, struct ceph_mds_request, r_node);
511 if (tid < req->r_tid)
513 else if (tid > req->r_tid)
516 ceph_mdsc_get_request(req);
523 static void __insert_request(struct ceph_mds_client *mdsc,
524 struct ceph_mds_request *new)
526 struct rb_node **p = &mdsc->request_tree.rb_node;
527 struct rb_node *parent = NULL;
528 struct ceph_mds_request *req = NULL;
532 req = rb_entry(parent, struct ceph_mds_request, r_node);
533 if (new->r_tid < req->r_tid)
535 else if (new->r_tid > req->r_tid)
541 rb_link_node(&new->r_node, parent, p);
542 rb_insert_color(&new->r_node, &mdsc->request_tree);
546 * Register an in-flight request, and assign a tid. Link to directory
547 * are modifying (if any).
549 * Called under mdsc->mutex.
551 static void __register_request(struct ceph_mds_client *mdsc,
552 struct ceph_mds_request *req,
555 req->r_tid = ++mdsc->last_tid;
557 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
559 dout("__register_request %p tid %lld\n", req, req->r_tid);
560 ceph_mdsc_get_request(req);
561 __insert_request(mdsc, req);
563 req->r_uid = current_fsuid();
564 req->r_gid = current_fsgid();
567 struct ceph_inode_info *ci = ceph_inode(dir);
569 spin_lock(&ci->i_unsafe_lock);
570 req->r_unsafe_dir = dir;
571 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
572 spin_unlock(&ci->i_unsafe_lock);
576 static void __unregister_request(struct ceph_mds_client *mdsc,
577 struct ceph_mds_request *req)
579 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
580 rb_erase(&req->r_node, &mdsc->request_tree);
581 RB_CLEAR_NODE(&req->r_node);
583 if (req->r_unsafe_dir) {
584 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
586 spin_lock(&ci->i_unsafe_lock);
587 list_del_init(&req->r_unsafe_dir_item);
588 spin_unlock(&ci->i_unsafe_lock);
591 ceph_mdsc_put_request(req);
595 * Choose mds to send request to next. If there is a hint set in the
596 * request (e.g., due to a prior forward hint from the mds), use that.
597 * Otherwise, consult frag tree and/or caps to identify the
598 * appropriate mds. If all else fails, choose randomly.
600 * Called under mdsc->mutex.
602 struct dentry *get_nonsnap_parent(struct dentry *dentry)
604 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
605 dentry = dentry->d_parent;
609 static int __choose_mds(struct ceph_mds_client *mdsc,
610 struct ceph_mds_request *req)
613 struct ceph_inode_info *ci;
614 struct ceph_cap *cap;
615 int mode = req->r_direct_mode;
617 u32 hash = req->r_direct_hash;
618 bool is_hash = req->r_direct_is_hash;
621 * is there a specific mds we should try? ignore hint if we have
622 * no session and the mds is not up (active or recovering).
624 if (req->r_resend_mds >= 0 &&
625 (__have_session(mdsc, req->r_resend_mds) ||
626 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
627 dout("choose_mds using resend_mds mds%d\n",
629 return req->r_resend_mds;
632 if (mode == USE_RANDOM_MDS)
637 inode = req->r_inode;
638 } else if (req->r_dentry) {
639 struct inode *dir = req->r_dentry->d_parent->d_inode;
641 if (dir->i_sb != mdsc->fsc->sb) {
643 inode = req->r_dentry->d_inode;
644 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
645 /* direct snapped/virtual snapdir requests
646 * based on parent dir inode */
648 get_nonsnap_parent(req->r_dentry->d_parent);
650 dout("__choose_mds using nonsnap parent %p\n", inode);
651 } else if (req->r_dentry->d_inode) {
653 inode = req->r_dentry->d_inode;
657 hash = req->r_dentry->d_name.hash;
662 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
666 ci = ceph_inode(inode);
668 if (is_hash && S_ISDIR(inode->i_mode)) {
669 struct ceph_inode_frag frag;
672 ceph_choose_frag(ci, hash, &frag, &found);
674 if (mode == USE_ANY_MDS && frag.ndist > 0) {
677 /* choose a random replica */
678 get_random_bytes(&r, 1);
681 dout("choose_mds %p %llx.%llx "
682 "frag %u mds%d (%d/%d)\n",
683 inode, ceph_vinop(inode),
689 /* since this file/dir wasn't known to be
690 * replicated, then we want to look for the
691 * authoritative mds. */
694 /* choose auth mds */
696 dout("choose_mds %p %llx.%llx "
697 "frag %u mds%d (auth)\n",
698 inode, ceph_vinop(inode), frag.frag, mds);
704 spin_lock(&inode->i_lock);
706 if (mode == USE_AUTH_MDS)
707 cap = ci->i_auth_cap;
708 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
709 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
711 spin_unlock(&inode->i_lock);
714 mds = cap->session->s_mds;
715 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
716 inode, ceph_vinop(inode), mds,
717 cap == ci->i_auth_cap ? "auth " : "", cap);
718 spin_unlock(&inode->i_lock);
722 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
723 dout("choose_mds chose random mds%d\n", mds);
731 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
733 struct ceph_msg *msg;
734 struct ceph_mds_session_head *h;
736 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS);
738 pr_err("create_session_msg ENOMEM creating msg\n");
741 h = msg->front.iov_base;
742 h->op = cpu_to_le32(op);
743 h->seq = cpu_to_le64(seq);
748 * send session open request.
750 * called under mdsc->mutex
752 static int __open_session(struct ceph_mds_client *mdsc,
753 struct ceph_mds_session *session)
755 struct ceph_msg *msg;
757 int mds = session->s_mds;
759 /* wait for mds to go active? */
760 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
761 dout("open_session to mds%d (%s)\n", mds,
762 ceph_mds_state_name(mstate));
763 session->s_state = CEPH_MDS_SESSION_OPENING;
764 session->s_renew_requested = jiffies;
766 /* send connect message */
767 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
770 ceph_con_send(&session->s_con, msg);
775 * open sessions for any export targets for the given mds
777 * called under mdsc->mutex
779 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
780 struct ceph_mds_session *session)
782 struct ceph_mds_info *mi;
783 struct ceph_mds_session *ts;
784 int i, mds = session->s_mds;
787 if (mds >= mdsc->mdsmap->m_max_mds)
789 mi = &mdsc->mdsmap->m_info[mds];
790 dout("open_export_target_sessions for mds%d (%d targets)\n",
791 session->s_mds, mi->num_export_targets);
793 for (i = 0; i < mi->num_export_targets; i++) {
794 target = mi->export_targets[i];
795 ts = __ceph_lookup_mds_session(mdsc, target);
797 ts = register_session(mdsc, target);
801 if (session->s_state == CEPH_MDS_SESSION_NEW ||
802 session->s_state == CEPH_MDS_SESSION_CLOSING)
803 __open_session(mdsc, session);
805 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
806 i, ts, session_state_name(ts->s_state));
807 ceph_put_mds_session(ts);
811 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
812 struct ceph_mds_session *session)
814 mutex_lock(&mdsc->mutex);
815 __open_export_target_sessions(mdsc, session);
816 mutex_unlock(&mdsc->mutex);
824 * Free preallocated cap messages assigned to this session
826 static void cleanup_cap_releases(struct ceph_mds_session *session)
828 struct ceph_msg *msg;
830 spin_lock(&session->s_cap_lock);
831 while (!list_empty(&session->s_cap_releases)) {
832 msg = list_first_entry(&session->s_cap_releases,
833 struct ceph_msg, list_head);
834 list_del_init(&msg->list_head);
837 while (!list_empty(&session->s_cap_releases_done)) {
838 msg = list_first_entry(&session->s_cap_releases_done,
839 struct ceph_msg, list_head);
840 list_del_init(&msg->list_head);
843 spin_unlock(&session->s_cap_lock);
847 * Helper to safely iterate over all caps associated with a session, with
848 * special care taken to handle a racing __ceph_remove_cap().
850 * Caller must hold session s_mutex.
852 static int iterate_session_caps(struct ceph_mds_session *session,
853 int (*cb)(struct inode *, struct ceph_cap *,
857 struct ceph_cap *cap;
858 struct inode *inode, *last_inode = NULL;
859 struct ceph_cap *old_cap = NULL;
862 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
863 spin_lock(&session->s_cap_lock);
864 p = session->s_caps.next;
865 while (p != &session->s_caps) {
866 cap = list_entry(p, struct ceph_cap, session_caps);
867 inode = igrab(&cap->ci->vfs_inode);
872 session->s_cap_iterator = cap;
873 spin_unlock(&session->s_cap_lock);
880 ceph_put_cap(session->s_mdsc, old_cap);
884 ret = cb(inode, cap, arg);
887 spin_lock(&session->s_cap_lock);
889 if (cap->ci == NULL) {
890 dout("iterate_session_caps finishing cap %p removal\n",
892 BUG_ON(cap->session != session);
893 list_del_init(&cap->session_caps);
894 session->s_nr_caps--;
896 old_cap = cap; /* put_cap it w/o locks held */
903 session->s_cap_iterator = NULL;
904 spin_unlock(&session->s_cap_lock);
909 ceph_put_cap(session->s_mdsc, old_cap);
914 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
917 struct ceph_inode_info *ci = ceph_inode(inode);
920 dout("removing cap %p, ci is %p, inode is %p\n",
921 cap, ci, &ci->vfs_inode);
922 spin_lock(&inode->i_lock);
923 __ceph_remove_cap(cap);
924 if (!__ceph_is_any_real_caps(ci)) {
925 struct ceph_mds_client *mdsc =
926 ceph_sb_to_client(inode->i_sb)->mdsc;
928 spin_lock(&mdsc->cap_dirty_lock);
929 if (!list_empty(&ci->i_dirty_item)) {
930 pr_info(" dropping dirty %s state for %p %lld\n",
931 ceph_cap_string(ci->i_dirty_caps),
932 inode, ceph_ino(inode));
933 ci->i_dirty_caps = 0;
934 list_del_init(&ci->i_dirty_item);
937 if (!list_empty(&ci->i_flushing_item)) {
938 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
939 ceph_cap_string(ci->i_flushing_caps),
940 inode, ceph_ino(inode));
941 ci->i_flushing_caps = 0;
942 list_del_init(&ci->i_flushing_item);
943 mdsc->num_cap_flushing--;
946 if (drop && ci->i_wrbuffer_ref) {
947 pr_info(" dropping dirty data for %p %lld\n",
948 inode, ceph_ino(inode));
949 ci->i_wrbuffer_ref = 0;
950 ci->i_wrbuffer_ref_head = 0;
953 spin_unlock(&mdsc->cap_dirty_lock);
955 spin_unlock(&inode->i_lock);
962 * caller must hold session s_mutex
964 static void remove_session_caps(struct ceph_mds_session *session)
966 dout("remove_session_caps on %p\n", session);
967 iterate_session_caps(session, remove_session_caps_cb, NULL);
968 BUG_ON(session->s_nr_caps > 0);
969 BUG_ON(!list_empty(&session->s_cap_flushing));
970 cleanup_cap_releases(session);
974 * wake up any threads waiting on this session's caps. if the cap is
975 * old (didn't get renewed on the client reconnect), remove it now.
977 * caller must hold s_mutex.
979 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
982 struct ceph_inode_info *ci = ceph_inode(inode);
984 wake_up_all(&ci->i_cap_wq);
986 spin_lock(&inode->i_lock);
987 ci->i_wanted_max_size = 0;
988 ci->i_requested_max_size = 0;
989 spin_unlock(&inode->i_lock);
994 static void wake_up_session_caps(struct ceph_mds_session *session,
997 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
998 iterate_session_caps(session, wake_up_session_cb,
999 (void *)(unsigned long)reconnect);
1003 * Send periodic message to MDS renewing all currently held caps. The
1004 * ack will reset the expiration for all caps from this session.
1006 * caller holds s_mutex
1008 static int send_renew_caps(struct ceph_mds_client *mdsc,
1009 struct ceph_mds_session *session)
1011 struct ceph_msg *msg;
1014 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1015 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1016 pr_info("mds%d caps stale\n", session->s_mds);
1017 session->s_renew_requested = jiffies;
1019 /* do not try to renew caps until a recovering mds has reconnected
1020 * with its clients. */
1021 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1022 if (state < CEPH_MDS_STATE_RECONNECT) {
1023 dout("send_renew_caps ignoring mds%d (%s)\n",
1024 session->s_mds, ceph_mds_state_name(state));
1028 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1029 ceph_mds_state_name(state));
1030 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1031 ++session->s_renew_seq);
1034 ceph_con_send(&session->s_con, msg);
1039 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1041 * Called under session->s_mutex
1043 static void renewed_caps(struct ceph_mds_client *mdsc,
1044 struct ceph_mds_session *session, int is_renew)
1049 spin_lock(&session->s_cap_lock);
1050 was_stale = is_renew && (session->s_cap_ttl == 0 ||
1051 time_after_eq(jiffies, session->s_cap_ttl));
1053 session->s_cap_ttl = session->s_renew_requested +
1054 mdsc->mdsmap->m_session_timeout*HZ;
1057 if (time_before(jiffies, session->s_cap_ttl)) {
1058 pr_info("mds%d caps renewed\n", session->s_mds);
1061 pr_info("mds%d caps still stale\n", session->s_mds);
1064 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1065 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1066 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1067 spin_unlock(&session->s_cap_lock);
1070 wake_up_session_caps(session, 0);
1074 * send a session close request
1076 static int request_close_session(struct ceph_mds_client *mdsc,
1077 struct ceph_mds_session *session)
1079 struct ceph_msg *msg;
1081 dout("request_close_session mds%d state %s seq %lld\n",
1082 session->s_mds, session_state_name(session->s_state),
1084 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1087 ceph_con_send(&session->s_con, msg);
1092 * Called with s_mutex held.
1094 static int __close_session(struct ceph_mds_client *mdsc,
1095 struct ceph_mds_session *session)
1097 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1099 session->s_state = CEPH_MDS_SESSION_CLOSING;
1100 return request_close_session(mdsc, session);
1104 * Trim old(er) caps.
1106 * Because we can't cache an inode without one or more caps, we do
1107 * this indirectly: if a cap is unused, we prune its aliases, at which
1108 * point the inode will hopefully get dropped to.
1110 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1111 * memory pressure from the MDS, though, so it needn't be perfect.
1113 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1115 struct ceph_mds_session *session = arg;
1116 struct ceph_inode_info *ci = ceph_inode(inode);
1117 int used, oissued, mine;
1119 if (session->s_trim_caps <= 0)
1122 spin_lock(&inode->i_lock);
1123 mine = cap->issued | cap->implemented;
1124 used = __ceph_caps_used(ci);
1125 oissued = __ceph_caps_issued_other(ci, cap);
1127 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1128 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1129 ceph_cap_string(used));
1130 if (ci->i_dirty_caps)
1131 goto out; /* dirty caps */
1132 if ((used & ~oissued) & mine)
1133 goto out; /* we need these caps */
1135 session->s_trim_caps--;
1137 /* we aren't the only cap.. just remove us */
1138 __ceph_remove_cap(cap);
1140 /* try to drop referring dentries */
1141 spin_unlock(&inode->i_lock);
1142 d_prune_aliases(inode);
1143 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1144 inode, cap, atomic_read(&inode->i_count));
1149 spin_unlock(&inode->i_lock);
1154 * Trim session cap count down to some max number.
1156 static int trim_caps(struct ceph_mds_client *mdsc,
1157 struct ceph_mds_session *session,
1160 int trim_caps = session->s_nr_caps - max_caps;
1162 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1163 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1164 if (trim_caps > 0) {
1165 session->s_trim_caps = trim_caps;
1166 iterate_session_caps(session, trim_caps_cb, session);
1167 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1168 session->s_mds, session->s_nr_caps, max_caps,
1169 trim_caps - session->s_trim_caps);
1170 session->s_trim_caps = 0;
1176 * Allocate cap_release messages. If there is a partially full message
1177 * in the queue, try to allocate enough to cover it's remainder, so that
1178 * we can send it immediately.
1180 * Called under s_mutex.
1182 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1183 struct ceph_mds_session *session)
1185 struct ceph_msg *msg, *partial = NULL;
1186 struct ceph_mds_cap_release *head;
1188 int extra = mdsc->fsc->mount_options->cap_release_safety;
1191 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1194 spin_lock(&session->s_cap_lock);
1196 if (!list_empty(&session->s_cap_releases)) {
1197 msg = list_first_entry(&session->s_cap_releases,
1200 head = msg->front.iov_base;
1201 num = le32_to_cpu(head->num);
1203 dout(" partial %p with (%d/%d)\n", msg, num,
1204 (int)CEPH_CAPS_PER_RELEASE);
1205 extra += CEPH_CAPS_PER_RELEASE - num;
1209 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1210 spin_unlock(&session->s_cap_lock);
1211 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1215 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1216 (int)msg->front.iov_len);
1217 head = msg->front.iov_base;
1218 head->num = cpu_to_le32(0);
1219 msg->front.iov_len = sizeof(*head);
1220 spin_lock(&session->s_cap_lock);
1221 list_add(&msg->list_head, &session->s_cap_releases);
1222 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1226 head = partial->front.iov_base;
1227 num = le32_to_cpu(head->num);
1228 dout(" queueing partial %p with %d/%d\n", partial, num,
1229 (int)CEPH_CAPS_PER_RELEASE);
1230 list_move_tail(&partial->list_head,
1231 &session->s_cap_releases_done);
1232 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1235 spin_unlock(&session->s_cap_lock);
1241 * flush all dirty inode data to disk.
1243 * returns true if we've flushed through want_flush_seq
1245 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1249 dout("check_cap_flush want %lld\n", want_flush_seq);
1250 mutex_lock(&mdsc->mutex);
1251 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1252 struct ceph_mds_session *session = mdsc->sessions[mds];
1256 get_session(session);
1257 mutex_unlock(&mdsc->mutex);
1259 mutex_lock(&session->s_mutex);
1260 if (!list_empty(&session->s_cap_flushing)) {
1261 struct ceph_inode_info *ci =
1262 list_entry(session->s_cap_flushing.next,
1263 struct ceph_inode_info,
1265 struct inode *inode = &ci->vfs_inode;
1267 spin_lock(&inode->i_lock);
1268 if (ci->i_cap_flush_seq <= want_flush_seq) {
1269 dout("check_cap_flush still flushing %p "
1270 "seq %lld <= %lld to mds%d\n", inode,
1271 ci->i_cap_flush_seq, want_flush_seq,
1275 spin_unlock(&inode->i_lock);
1277 mutex_unlock(&session->s_mutex);
1278 ceph_put_mds_session(session);
1282 mutex_lock(&mdsc->mutex);
1285 mutex_unlock(&mdsc->mutex);
1286 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1291 * called under s_mutex
1293 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1294 struct ceph_mds_session *session)
1296 struct ceph_msg *msg;
1298 dout("send_cap_releases mds%d\n", session->s_mds);
1299 spin_lock(&session->s_cap_lock);
1300 while (!list_empty(&session->s_cap_releases_done)) {
1301 msg = list_first_entry(&session->s_cap_releases_done,
1302 struct ceph_msg, list_head);
1303 list_del_init(&msg->list_head);
1304 spin_unlock(&session->s_cap_lock);
1305 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1306 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1307 ceph_con_send(&session->s_con, msg);
1308 spin_lock(&session->s_cap_lock);
1310 spin_unlock(&session->s_cap_lock);
1313 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1314 struct ceph_mds_session *session)
1316 struct ceph_msg *msg;
1317 struct ceph_mds_cap_release *head;
1320 dout("discard_cap_releases mds%d\n", session->s_mds);
1321 spin_lock(&session->s_cap_lock);
1323 /* zero out the in-progress message */
1324 msg = list_first_entry(&session->s_cap_releases,
1325 struct ceph_msg, list_head);
1326 head = msg->front.iov_base;
1327 num = le32_to_cpu(head->num);
1328 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1329 head->num = cpu_to_le32(0);
1330 session->s_num_cap_releases += num;
1332 /* requeue completed messages */
1333 while (!list_empty(&session->s_cap_releases_done)) {
1334 msg = list_first_entry(&session->s_cap_releases_done,
1335 struct ceph_msg, list_head);
1336 list_del_init(&msg->list_head);
1338 head = msg->front.iov_base;
1339 num = le32_to_cpu(head->num);
1340 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1342 session->s_num_cap_releases += num;
1343 head->num = cpu_to_le32(0);
1344 msg->front.iov_len = sizeof(*head);
1345 list_add(&msg->list_head, &session->s_cap_releases);
1348 spin_unlock(&session->s_cap_lock);
1356 * Create an mds request.
1358 struct ceph_mds_request *
1359 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1361 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1364 return ERR_PTR(-ENOMEM);
1366 mutex_init(&req->r_fill_mutex);
1368 req->r_started = jiffies;
1369 req->r_resend_mds = -1;
1370 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1372 kref_init(&req->r_kref);
1373 INIT_LIST_HEAD(&req->r_wait);
1374 init_completion(&req->r_completion);
1375 init_completion(&req->r_safe_completion);
1376 INIT_LIST_HEAD(&req->r_unsafe_item);
1379 req->r_direct_mode = mode;
1384 * return oldest (lowest) request, tid in request tree, 0 if none.
1386 * called under mdsc->mutex.
1388 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1390 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1392 return rb_entry(rb_first(&mdsc->request_tree),
1393 struct ceph_mds_request, r_node);
1396 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1398 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1406 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1407 * on build_path_from_dentry in fs/cifs/dir.c.
1409 * If @stop_on_nosnap, generate path relative to the first non-snapped
1412 * Encode hidden .snap dirs as a double /, i.e.
1413 * foo/.snap/bar -> foo//bar
1415 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1418 struct dentry *temp;
1423 return ERR_PTR(-EINVAL);
1427 for (temp = dentry; !IS_ROOT(temp);) {
1428 struct inode *inode = temp->d_inode;
1429 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1430 len++; /* slash only */
1431 else if (stop_on_nosnap && inode &&
1432 ceph_snap(inode) == CEPH_NOSNAP)
1435 len += 1 + temp->d_name.len;
1436 temp = temp->d_parent;
1438 pr_err("build_path corrupt dentry %p\n", dentry);
1439 return ERR_PTR(-EINVAL);
1443 len--; /* no leading '/' */
1445 path = kmalloc(len+1, GFP_NOFS);
1447 return ERR_PTR(-ENOMEM);
1449 path[pos] = 0; /* trailing null */
1450 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1451 struct inode *inode = temp->d_inode;
1453 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1454 dout("build_path path+%d: %p SNAPDIR\n",
1456 } else if (stop_on_nosnap && inode &&
1457 ceph_snap(inode) == CEPH_NOSNAP) {
1460 pos -= temp->d_name.len;
1463 strncpy(path + pos, temp->d_name.name,
1468 temp = temp->d_parent;
1470 pr_err("build_path corrupt dentry\n");
1472 return ERR_PTR(-EINVAL);
1476 pr_err("build_path did not end path lookup where "
1477 "expected, namelen is %d, pos is %d\n", len, pos);
1478 /* presumably this is only possible if racing with a
1479 rename of one of the parent directories (we can not
1480 lock the dentries above us to prevent this, but
1481 retrying should be harmless) */
1486 *base = ceph_ino(temp->d_inode);
1488 dout("build_path on %p %d built %llx '%.*s'\n",
1489 dentry, dentry->d_count, *base, len, path);
1493 static int build_dentry_path(struct dentry *dentry,
1494 const char **ppath, int *ppathlen, u64 *pino,
1499 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1500 *pino = ceph_ino(dentry->d_parent->d_inode);
1501 *ppath = dentry->d_name.name;
1502 *ppathlen = dentry->d_name.len;
1505 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1507 return PTR_ERR(path);
1513 static int build_inode_path(struct inode *inode,
1514 const char **ppath, int *ppathlen, u64 *pino,
1517 struct dentry *dentry;
1520 if (ceph_snap(inode) == CEPH_NOSNAP) {
1521 *pino = ceph_ino(inode);
1525 dentry = d_find_alias(inode);
1526 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1529 return PTR_ERR(path);
1536 * request arguments may be specified via an inode *, a dentry *, or
1537 * an explicit ino+path.
1539 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1540 const char *rpath, u64 rino,
1541 const char **ppath, int *pathlen,
1542 u64 *ino, int *freepath)
1547 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1548 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1550 } else if (rdentry) {
1551 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1552 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1557 *pathlen = strlen(rpath);
1558 dout(" path %.*s\n", *pathlen, rpath);
1565 * called under mdsc->mutex
1567 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1568 struct ceph_mds_request *req,
1571 struct ceph_msg *msg;
1572 struct ceph_mds_request_head *head;
1573 const char *path1 = NULL;
1574 const char *path2 = NULL;
1575 u64 ino1 = 0, ino2 = 0;
1576 int pathlen1 = 0, pathlen2 = 0;
1577 int freepath1 = 0, freepath2 = 0;
1583 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1584 req->r_path1, req->r_ino1.ino,
1585 &path1, &pathlen1, &ino1, &freepath1);
1591 ret = set_request_path_attr(NULL, req->r_old_dentry,
1592 req->r_path2, req->r_ino2.ino,
1593 &path2, &pathlen2, &ino2, &freepath2);
1599 len = sizeof(*head) +
1600 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1602 /* calculate (max) length for cap releases */
1603 len += sizeof(struct ceph_mds_request_release) *
1604 (!!req->r_inode_drop + !!req->r_dentry_drop +
1605 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1606 if (req->r_dentry_drop)
1607 len += req->r_dentry->d_name.len;
1608 if (req->r_old_dentry_drop)
1609 len += req->r_old_dentry->d_name.len;
1611 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS);
1613 msg = ERR_PTR(-ENOMEM);
1617 msg->hdr.tid = cpu_to_le64(req->r_tid);
1619 head = msg->front.iov_base;
1620 p = msg->front.iov_base + sizeof(*head);
1621 end = msg->front.iov_base + msg->front.iov_len;
1623 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1624 head->op = cpu_to_le32(req->r_op);
1625 head->caller_uid = cpu_to_le32(req->r_uid);
1626 head->caller_gid = cpu_to_le32(req->r_gid);
1627 head->args = req->r_args;
1629 ceph_encode_filepath(&p, end, ino1, path1);
1630 ceph_encode_filepath(&p, end, ino2, path2);
1632 /* make note of release offset, in case we need to replay */
1633 req->r_request_release_offset = p - msg->front.iov_base;
1637 if (req->r_inode_drop)
1638 releases += ceph_encode_inode_release(&p,
1639 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1640 mds, req->r_inode_drop, req->r_inode_unless, 0);
1641 if (req->r_dentry_drop)
1642 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1643 mds, req->r_dentry_drop, req->r_dentry_unless);
1644 if (req->r_old_dentry_drop)
1645 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1646 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1647 if (req->r_old_inode_drop)
1648 releases += ceph_encode_inode_release(&p,
1649 req->r_old_dentry->d_inode,
1650 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1651 head->num_releases = cpu_to_le16(releases);
1654 msg->front.iov_len = p - msg->front.iov_base;
1655 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1657 msg->pages = req->r_pages;
1658 msg->nr_pages = req->r_num_pages;
1659 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1660 msg->hdr.data_off = cpu_to_le16(0);
1664 kfree((char *)path2);
1667 kfree((char *)path1);
1673 * called under mdsc->mutex if error, under no mutex if
1676 static void complete_request(struct ceph_mds_client *mdsc,
1677 struct ceph_mds_request *req)
1679 if (req->r_callback)
1680 req->r_callback(mdsc, req);
1682 complete_all(&req->r_completion);
1686 * called under mdsc->mutex
1688 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1689 struct ceph_mds_request *req,
1692 struct ceph_mds_request_head *rhead;
1693 struct ceph_msg *msg;
1699 struct ceph_cap *cap =
1700 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1703 req->r_sent_on_mseq = cap->mseq;
1705 req->r_sent_on_mseq = -1;
1707 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1708 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1710 if (req->r_got_unsafe) {
1712 * Replay. Do not regenerate message (and rebuild
1713 * paths, etc.); just use the original message.
1714 * Rebuilding paths will break for renames because
1715 * d_move mangles the src name.
1717 msg = req->r_request;
1718 rhead = msg->front.iov_base;
1720 flags = le32_to_cpu(rhead->flags);
1721 flags |= CEPH_MDS_FLAG_REPLAY;
1722 rhead->flags = cpu_to_le32(flags);
1724 if (req->r_target_inode)
1725 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1727 rhead->num_retry = req->r_attempts - 1;
1729 /* remove cap/dentry releases from message */
1730 rhead->num_releases = 0;
1731 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1732 msg->front.iov_len = req->r_request_release_offset;
1736 if (req->r_request) {
1737 ceph_msg_put(req->r_request);
1738 req->r_request = NULL;
1740 msg = create_request_message(mdsc, req, mds);
1742 req->r_err = PTR_ERR(msg);
1743 complete_request(mdsc, req);
1744 return PTR_ERR(msg);
1746 req->r_request = msg;
1748 rhead = msg->front.iov_base;
1749 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1750 if (req->r_got_unsafe)
1751 flags |= CEPH_MDS_FLAG_REPLAY;
1752 if (req->r_locked_dir)
1753 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1754 rhead->flags = cpu_to_le32(flags);
1755 rhead->num_fwd = req->r_num_fwd;
1756 rhead->num_retry = req->r_attempts - 1;
1759 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1764 * send request, or put it on the appropriate wait list.
1766 static int __do_request(struct ceph_mds_client *mdsc,
1767 struct ceph_mds_request *req)
1769 struct ceph_mds_session *session = NULL;
1773 if (req->r_err || req->r_got_result)
1776 if (req->r_timeout &&
1777 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1778 dout("do_request timed out\n");
1783 mds = __choose_mds(mdsc, req);
1785 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1786 dout("do_request no mds or not active, waiting for map\n");
1787 list_add(&req->r_wait, &mdsc->waiting_for_map);
1791 /* get, open session */
1792 session = __ceph_lookup_mds_session(mdsc, mds);
1794 session = register_session(mdsc, mds);
1795 if (IS_ERR(session)) {
1796 err = PTR_ERR(session);
1800 dout("do_request mds%d session %p state %s\n", mds, session,
1801 session_state_name(session->s_state));
1802 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1803 session->s_state != CEPH_MDS_SESSION_HUNG) {
1804 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1805 session->s_state == CEPH_MDS_SESSION_CLOSING)
1806 __open_session(mdsc, session);
1807 list_add(&req->r_wait, &session->s_waiting);
1812 req->r_session = get_session(session);
1813 req->r_resend_mds = -1; /* forget any previous mds hint */
1815 if (req->r_request_started == 0) /* note request start time */
1816 req->r_request_started = jiffies;
1818 err = __prepare_send_request(mdsc, req, mds);
1820 ceph_msg_get(req->r_request);
1821 ceph_con_send(&session->s_con, req->r_request);
1825 ceph_put_mds_session(session);
1831 complete_request(mdsc, req);
1836 * called under mdsc->mutex
1838 static void __wake_requests(struct ceph_mds_client *mdsc,
1839 struct list_head *head)
1841 struct ceph_mds_request *req, *nreq;
1843 list_for_each_entry_safe(req, nreq, head, r_wait) {
1844 list_del_init(&req->r_wait);
1845 __do_request(mdsc, req);
1850 * Wake up threads with requests pending for @mds, so that they can
1851 * resubmit their requests to a possibly different mds.
1853 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1855 struct ceph_mds_request *req;
1858 dout("kick_requests mds%d\n", mds);
1859 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1860 req = rb_entry(p, struct ceph_mds_request, r_node);
1861 if (req->r_got_unsafe)
1863 if (req->r_session &&
1864 req->r_session->s_mds == mds) {
1865 dout(" kicking tid %llu\n", req->r_tid);
1866 put_request_session(req);
1867 __do_request(mdsc, req);
1872 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1873 struct ceph_mds_request *req)
1875 dout("submit_request on %p\n", req);
1876 mutex_lock(&mdsc->mutex);
1877 __register_request(mdsc, req, NULL);
1878 __do_request(mdsc, req);
1879 mutex_unlock(&mdsc->mutex);
1883 * Synchrously perform an mds request. Take care of all of the
1884 * session setup, forwarding, retry details.
1886 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1888 struct ceph_mds_request *req)
1892 dout("do_request on %p\n", req);
1894 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1896 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1897 if (req->r_locked_dir)
1898 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1899 if (req->r_old_dentry)
1901 ceph_inode(req->r_old_dentry->d_parent->d_inode),
1905 mutex_lock(&mdsc->mutex);
1906 __register_request(mdsc, req, dir);
1907 __do_request(mdsc, req);
1911 __unregister_request(mdsc, req);
1912 dout("do_request early error %d\n", err);
1917 mutex_unlock(&mdsc->mutex);
1918 dout("do_request waiting\n");
1919 if (req->r_timeout) {
1920 err = (long)wait_for_completion_killable_timeout(
1921 &req->r_completion, req->r_timeout);
1925 err = wait_for_completion_killable(&req->r_completion);
1927 dout("do_request waited, got %d\n", err);
1928 mutex_lock(&mdsc->mutex);
1930 /* only abort if we didn't race with a real reply */
1931 if (req->r_got_result) {
1932 err = le32_to_cpu(req->r_reply_info.head->result);
1933 } else if (err < 0) {
1934 dout("aborted request %lld with %d\n", req->r_tid, err);
1937 * ensure we aren't running concurrently with
1938 * ceph_fill_trace or ceph_readdir_prepopulate, which
1939 * rely on locks (dir mutex) held by our caller.
1941 mutex_lock(&req->r_fill_mutex);
1943 req->r_aborted = true;
1944 mutex_unlock(&req->r_fill_mutex);
1946 if (req->r_locked_dir &&
1947 (req->r_op & CEPH_MDS_OP_WRITE))
1948 ceph_invalidate_dir_request(req);
1954 mutex_unlock(&mdsc->mutex);
1955 dout("do_request %p done, result %d\n", req, err);
1960 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
1961 * namespace request.
1963 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
1965 struct inode *inode = req->r_locked_dir;
1966 struct ceph_inode_info *ci = ceph_inode(inode);
1968 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
1969 spin_lock(&inode->i_lock);
1970 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
1971 ci->i_release_count++;
1972 spin_unlock(&inode->i_lock);
1975 ceph_invalidate_dentry_lease(req->r_dentry);
1976 if (req->r_old_dentry)
1977 ceph_invalidate_dentry_lease(req->r_old_dentry);
1983 * We take the session mutex and parse and process the reply immediately.
1984 * This preserves the logical ordering of replies, capabilities, etc., sent
1985 * by the MDS as they are applied to our local cache.
1987 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
1989 struct ceph_mds_client *mdsc = session->s_mdsc;
1990 struct ceph_mds_request *req;
1991 struct ceph_mds_reply_head *head = msg->front.iov_base;
1992 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
1995 int mds = session->s_mds;
1997 if (msg->front.iov_len < sizeof(*head)) {
1998 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2003 /* get request, session */
2004 tid = le64_to_cpu(msg->hdr.tid);
2005 mutex_lock(&mdsc->mutex);
2006 req = __lookup_request(mdsc, tid);
2008 dout("handle_reply on unknown tid %llu\n", tid);
2009 mutex_unlock(&mdsc->mutex);
2012 dout("handle_reply %p\n", req);
2014 /* correct session? */
2015 if (req->r_session != session) {
2016 pr_err("mdsc_handle_reply got %llu on session mds%d"
2017 " not mds%d\n", tid, session->s_mds,
2018 req->r_session ? req->r_session->s_mds : -1);
2019 mutex_unlock(&mdsc->mutex);
2024 if ((req->r_got_unsafe && !head->safe) ||
2025 (req->r_got_safe && head->safe)) {
2026 pr_warning("got a dup %s reply on %llu from mds%d\n",
2027 head->safe ? "safe" : "unsafe", tid, mds);
2028 mutex_unlock(&mdsc->mutex);
2031 if (req->r_got_safe && !head->safe) {
2032 pr_warning("got unsafe after safe on %llu from mds%d\n",
2034 mutex_unlock(&mdsc->mutex);
2038 result = le32_to_cpu(head->result);
2042 * if we're not talking to the authority, send to them
2043 * if the authority has changed while we weren't looking,
2044 * send to new authority
2045 * Otherwise we just have to return an ESTALE
2047 if (result == -ESTALE) {
2048 dout("got ESTALE on request %llu", req->r_tid);
2049 if (!req->r_inode) {
2050 /* do nothing; not an authority problem */
2051 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2052 dout("not using auth, setting for that now");
2053 req->r_direct_mode = USE_AUTH_MDS;
2054 __do_request(mdsc, req);
2055 mutex_unlock(&mdsc->mutex);
2058 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2059 struct ceph_cap *cap =
2060 ceph_get_cap_for_mds(ci, req->r_mds);;
2062 dout("already using auth");
2063 if ((!cap || cap != ci->i_auth_cap) ||
2064 (cap->mseq != req->r_sent_on_mseq)) {
2065 dout("but cap changed, so resending");
2066 __do_request(mdsc, req);
2067 mutex_unlock(&mdsc->mutex);
2071 dout("have to return ESTALE on request %llu", req->r_tid);
2076 req->r_got_safe = true;
2077 __unregister_request(mdsc, req);
2078 complete_all(&req->r_safe_completion);
2080 if (req->r_got_unsafe) {
2082 * We already handled the unsafe response, now do the
2083 * cleanup. No need to examine the response; the MDS
2084 * doesn't include any result info in the safe
2085 * response. And even if it did, there is nothing
2086 * useful we could do with a revised return value.
2088 dout("got safe reply %llu, mds%d\n", tid, mds);
2089 list_del_init(&req->r_unsafe_item);
2091 /* last unsafe request during umount? */
2092 if (mdsc->stopping && !__get_oldest_req(mdsc))
2093 complete_all(&mdsc->safe_umount_waiters);
2094 mutex_unlock(&mdsc->mutex);
2098 req->r_got_unsafe = true;
2099 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2102 dout("handle_reply tid %lld result %d\n", tid, result);
2103 rinfo = &req->r_reply_info;
2104 err = parse_reply_info(msg, rinfo);
2105 mutex_unlock(&mdsc->mutex);
2107 mutex_lock(&session->s_mutex);
2109 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2115 if (rinfo->snapblob_len) {
2116 down_write(&mdsc->snap_rwsem);
2117 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2118 rinfo->snapblob + rinfo->snapblob_len,
2119 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2120 downgrade_write(&mdsc->snap_rwsem);
2122 down_read(&mdsc->snap_rwsem);
2125 /* insert trace into our cache */
2126 mutex_lock(&req->r_fill_mutex);
2127 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2129 if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
2131 ceph_readdir_prepopulate(req, req->r_session);
2132 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2134 mutex_unlock(&req->r_fill_mutex);
2136 up_read(&mdsc->snap_rwsem);
2138 mutex_lock(&mdsc->mutex);
2139 if (!req->r_aborted) {
2145 req->r_got_result = true;
2148 dout("reply arrived after request %lld was aborted\n", tid);
2150 mutex_unlock(&mdsc->mutex);
2152 ceph_add_cap_releases(mdsc, req->r_session);
2153 mutex_unlock(&session->s_mutex);
2155 /* kick calling process */
2156 complete_request(mdsc, req);
2158 ceph_mdsc_put_request(req);
2165 * handle mds notification that our request has been forwarded.
2167 static void handle_forward(struct ceph_mds_client *mdsc,
2168 struct ceph_mds_session *session,
2169 struct ceph_msg *msg)
2171 struct ceph_mds_request *req;
2172 u64 tid = le64_to_cpu(msg->hdr.tid);
2176 void *p = msg->front.iov_base;
2177 void *end = p + msg->front.iov_len;
2179 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2180 next_mds = ceph_decode_32(&p);
2181 fwd_seq = ceph_decode_32(&p);
2183 mutex_lock(&mdsc->mutex);
2184 req = __lookup_request(mdsc, tid);
2186 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2187 goto out; /* dup reply? */
2190 if (req->r_aborted) {
2191 dout("forward tid %llu aborted, unregistering\n", tid);
2192 __unregister_request(mdsc, req);
2193 } else if (fwd_seq <= req->r_num_fwd) {
2194 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2195 tid, next_mds, req->r_num_fwd, fwd_seq);
2197 /* resend. forward race not possible; mds would drop */
2198 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2200 BUG_ON(req->r_got_result);
2201 req->r_num_fwd = fwd_seq;
2202 req->r_resend_mds = next_mds;
2203 put_request_session(req);
2204 __do_request(mdsc, req);
2206 ceph_mdsc_put_request(req);
2208 mutex_unlock(&mdsc->mutex);
2212 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2216 * handle a mds session control message
2218 static void handle_session(struct ceph_mds_session *session,
2219 struct ceph_msg *msg)
2221 struct ceph_mds_client *mdsc = session->s_mdsc;
2224 int mds = session->s_mds;
2225 struct ceph_mds_session_head *h = msg->front.iov_base;
2229 if (msg->front.iov_len != sizeof(*h))
2231 op = le32_to_cpu(h->op);
2232 seq = le64_to_cpu(h->seq);
2234 mutex_lock(&mdsc->mutex);
2235 if (op == CEPH_SESSION_CLOSE)
2236 __unregister_session(mdsc, session);
2237 /* FIXME: this ttl calculation is generous */
2238 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2239 mutex_unlock(&mdsc->mutex);
2241 mutex_lock(&session->s_mutex);
2243 dout("handle_session mds%d %s %p state %s seq %llu\n",
2244 mds, ceph_session_op_name(op), session,
2245 session_state_name(session->s_state), seq);
2247 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2248 session->s_state = CEPH_MDS_SESSION_OPEN;
2249 pr_info("mds%d came back\n", session->s_mds);
2253 case CEPH_SESSION_OPEN:
2254 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2255 pr_info("mds%d reconnect success\n", session->s_mds);
2256 session->s_state = CEPH_MDS_SESSION_OPEN;
2257 renewed_caps(mdsc, session, 0);
2260 __close_session(mdsc, session);
2263 case CEPH_SESSION_RENEWCAPS:
2264 if (session->s_renew_seq == seq)
2265 renewed_caps(mdsc, session, 1);
2268 case CEPH_SESSION_CLOSE:
2269 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2270 pr_info("mds%d reconnect denied\n", session->s_mds);
2271 remove_session_caps(session);
2272 wake = 1; /* for good measure */
2273 wake_up_all(&mdsc->session_close_wq);
2274 kick_requests(mdsc, mds);
2277 case CEPH_SESSION_STALE:
2278 pr_info("mds%d caps went stale, renewing\n",
2280 spin_lock(&session->s_cap_lock);
2281 session->s_cap_gen++;
2282 session->s_cap_ttl = 0;
2283 spin_unlock(&session->s_cap_lock);
2284 send_renew_caps(mdsc, session);
2287 case CEPH_SESSION_RECALL_STATE:
2288 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2292 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2296 mutex_unlock(&session->s_mutex);
2298 mutex_lock(&mdsc->mutex);
2299 __wake_requests(mdsc, &session->s_waiting);
2300 mutex_unlock(&mdsc->mutex);
2305 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2306 (int)msg->front.iov_len);
2313 * called under session->mutex.
2315 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2316 struct ceph_mds_session *session)
2318 struct ceph_mds_request *req, *nreq;
2321 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2323 mutex_lock(&mdsc->mutex);
2324 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2325 err = __prepare_send_request(mdsc, req, session->s_mds);
2327 ceph_msg_get(req->r_request);
2328 ceph_con_send(&session->s_con, req->r_request);
2331 mutex_unlock(&mdsc->mutex);
2335 * Encode information about a cap for a reconnect with the MDS.
2337 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2341 struct ceph_mds_cap_reconnect v2;
2342 struct ceph_mds_cap_reconnect_v1 v1;
2345 struct ceph_inode_info *ci;
2346 struct ceph_reconnect_state *recon_state = arg;
2347 struct ceph_pagelist *pagelist = recon_state->pagelist;
2351 struct dentry *dentry;
2355 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2356 inode, ceph_vinop(inode), cap, cap->cap_id,
2357 ceph_cap_string(cap->issued));
2358 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2362 dentry = d_find_alias(inode);
2364 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2366 err = PTR_ERR(path);
2373 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2377 spin_lock(&inode->i_lock);
2378 cap->seq = 0; /* reset cap seq */
2379 cap->issue_seq = 0; /* and issue_seq */
2381 if (recon_state->flock) {
2382 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2383 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2384 rec.v2.issued = cpu_to_le32(cap->issued);
2385 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2386 rec.v2.pathbase = cpu_to_le64(pathbase);
2387 rec.v2.flock_len = 0;
2388 reclen = sizeof(rec.v2);
2390 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2391 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2392 rec.v1.issued = cpu_to_le32(cap->issued);
2393 rec.v1.size = cpu_to_le64(inode->i_size);
2394 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2395 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2396 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2397 rec.v1.pathbase = cpu_to_le64(pathbase);
2398 reclen = sizeof(rec.v1);
2400 spin_unlock(&inode->i_lock);
2402 if (recon_state->flock) {
2403 int num_fcntl_locks, num_flock_locks;
2404 struct ceph_pagelist_cursor trunc_point;
2406 ceph_pagelist_set_cursor(pagelist, &trunc_point);
2409 ceph_count_locks(inode, &num_fcntl_locks,
2411 rec.v2.flock_len = (2*sizeof(u32) +
2412 (num_fcntl_locks+num_flock_locks) *
2413 sizeof(struct ceph_filelock));
2416 /* pre-alloc pagelist */
2417 ceph_pagelist_truncate(pagelist, &trunc_point);
2418 err = ceph_pagelist_append(pagelist, &rec, reclen);
2420 err = ceph_pagelist_reserve(pagelist,
2426 err = ceph_encode_locks(inode,
2432 } while (err == -ENOSPC);
2434 err = ceph_pagelist_append(pagelist, &rec, reclen);
2446 * If an MDS fails and recovers, clients need to reconnect in order to
2447 * reestablish shared state. This includes all caps issued through
2448 * this session _and_ the snap_realm hierarchy. Because it's not
2449 * clear which snap realms the mds cares about, we send everything we
2450 * know about.. that ensures we'll then get any new info the
2451 * recovering MDS might have.
2453 * This is a relatively heavyweight operation, but it's rare.
2455 * called with mdsc->mutex held.
2457 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2458 struct ceph_mds_session *session)
2460 struct ceph_msg *reply;
2462 int mds = session->s_mds;
2464 struct ceph_pagelist *pagelist;
2465 struct ceph_reconnect_state recon_state;
2467 pr_info("mds%d reconnect start\n", mds);
2469 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2471 goto fail_nopagelist;
2472 ceph_pagelist_init(pagelist);
2474 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS);
2478 mutex_lock(&session->s_mutex);
2479 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2482 ceph_con_open(&session->s_con,
2483 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2485 /* replay unsafe requests */
2486 replay_unsafe_requests(mdsc, session);
2488 down_read(&mdsc->snap_rwsem);
2490 dout("session %p state %s\n", session,
2491 session_state_name(session->s_state));
2493 /* drop old cap expires; we're about to reestablish that state */
2494 discard_cap_releases(mdsc, session);
2496 /* traverse this session's caps */
2497 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2501 recon_state.pagelist = pagelist;
2502 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2503 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2508 * snaprealms. we provide mds with the ino, seq (version), and
2509 * parent for all of our realms. If the mds has any newer info,
2512 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2513 struct ceph_snap_realm *realm =
2514 rb_entry(p, struct ceph_snap_realm, node);
2515 struct ceph_mds_snaprealm_reconnect sr_rec;
2517 dout(" adding snap realm %llx seq %lld parent %llx\n",
2518 realm->ino, realm->seq, realm->parent_ino);
2519 sr_rec.ino = cpu_to_le64(realm->ino);
2520 sr_rec.seq = cpu_to_le64(realm->seq);
2521 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2522 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2527 reply->pagelist = pagelist;
2528 if (recon_state.flock)
2529 reply->hdr.version = cpu_to_le16(2);
2530 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2531 reply->nr_pages = calc_pages_for(0, pagelist->length);
2532 ceph_con_send(&session->s_con, reply);
2534 mutex_unlock(&session->s_mutex);
2536 mutex_lock(&mdsc->mutex);
2537 __wake_requests(mdsc, &session->s_waiting);
2538 mutex_unlock(&mdsc->mutex);
2540 up_read(&mdsc->snap_rwsem);
2544 ceph_msg_put(reply);
2545 up_read(&mdsc->snap_rwsem);
2546 mutex_unlock(&session->s_mutex);
2548 ceph_pagelist_release(pagelist);
2551 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2557 * compare old and new mdsmaps, kicking requests
2558 * and closing out old connections as necessary
2560 * called under mdsc->mutex.
2562 static void check_new_map(struct ceph_mds_client *mdsc,
2563 struct ceph_mdsmap *newmap,
2564 struct ceph_mdsmap *oldmap)
2567 int oldstate, newstate;
2568 struct ceph_mds_session *s;
2570 dout("check_new_map new %u old %u\n",
2571 newmap->m_epoch, oldmap->m_epoch);
2573 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2574 if (mdsc->sessions[i] == NULL)
2576 s = mdsc->sessions[i];
2577 oldstate = ceph_mdsmap_get_state(oldmap, i);
2578 newstate = ceph_mdsmap_get_state(newmap, i);
2580 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2581 i, ceph_mds_state_name(oldstate),
2582 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2583 ceph_mds_state_name(newstate),
2584 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2585 session_state_name(s->s_state));
2587 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2588 ceph_mdsmap_get_addr(newmap, i),
2589 sizeof(struct ceph_entity_addr))) {
2590 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2591 /* the session never opened, just close it
2593 __wake_requests(mdsc, &s->s_waiting);
2594 __unregister_session(mdsc, s);
2597 mutex_unlock(&mdsc->mutex);
2598 mutex_lock(&s->s_mutex);
2599 mutex_lock(&mdsc->mutex);
2600 ceph_con_close(&s->s_con);
2601 mutex_unlock(&s->s_mutex);
2602 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2605 /* kick any requests waiting on the recovering mds */
2606 kick_requests(mdsc, i);
2607 } else if (oldstate == newstate) {
2608 continue; /* nothing new with this mds */
2614 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2615 newstate >= CEPH_MDS_STATE_RECONNECT) {
2616 mutex_unlock(&mdsc->mutex);
2617 send_mds_reconnect(mdsc, s);
2618 mutex_lock(&mdsc->mutex);
2622 * kick request on any mds that has gone active.
2624 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2625 newstate >= CEPH_MDS_STATE_ACTIVE) {
2626 if (oldstate != CEPH_MDS_STATE_CREATING &&
2627 oldstate != CEPH_MDS_STATE_STARTING)
2628 pr_info("mds%d recovery completed\n", s->s_mds);
2629 kick_requests(mdsc, i);
2630 ceph_kick_flushing_caps(mdsc, s);
2631 wake_up_session_caps(s, 1);
2635 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2636 s = mdsc->sessions[i];
2639 if (!ceph_mdsmap_is_laggy(newmap, i))
2641 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2642 s->s_state == CEPH_MDS_SESSION_HUNG ||
2643 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2644 dout(" connecting to export targets of laggy mds%d\n",
2646 __open_export_target_sessions(mdsc, s);
2658 * caller must hold session s_mutex, dentry->d_lock
2660 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2662 struct ceph_dentry_info *di = ceph_dentry(dentry);
2664 ceph_put_mds_session(di->lease_session);
2665 di->lease_session = NULL;
2668 static void handle_lease(struct ceph_mds_client *mdsc,
2669 struct ceph_mds_session *session,
2670 struct ceph_msg *msg)
2672 struct super_block *sb = mdsc->fsc->sb;
2673 struct inode *inode;
2674 struct ceph_inode_info *ci;
2675 struct dentry *parent, *dentry;
2676 struct ceph_dentry_info *di;
2677 int mds = session->s_mds;
2678 struct ceph_mds_lease *h = msg->front.iov_base;
2680 struct ceph_vino vino;
2685 dout("handle_lease from mds%d\n", mds);
2688 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2690 vino.ino = le64_to_cpu(h->ino);
2691 vino.snap = CEPH_NOSNAP;
2692 mask = le16_to_cpu(h->mask);
2693 seq = le32_to_cpu(h->seq);
2694 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2695 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2696 if (dname.len != get_unaligned_le32(h+1))
2699 mutex_lock(&session->s_mutex);
2703 inode = ceph_find_inode(sb, vino);
2704 dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
2705 ceph_lease_op_name(h->action), mask, vino.ino, inode,
2706 dname.len, dname.name);
2707 if (inode == NULL) {
2708 dout("handle_lease no inode %llx\n", vino.ino);
2711 ci = ceph_inode(inode);
2714 parent = d_find_alias(inode);
2716 dout("no parent dentry on inode %p\n", inode);
2718 goto release; /* hrm... */
2720 dname.hash = full_name_hash(dname.name, dname.len);
2721 dentry = d_lookup(parent, &dname);
2726 spin_lock(&dentry->d_lock);
2727 di = ceph_dentry(dentry);
2728 switch (h->action) {
2729 case CEPH_MDS_LEASE_REVOKE:
2730 if (di && di->lease_session == session) {
2731 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2732 h->seq = cpu_to_le32(di->lease_seq);
2733 __ceph_mdsc_drop_dentry_lease(dentry);
2738 case CEPH_MDS_LEASE_RENEW:
2739 if (di && di->lease_session == session &&
2740 di->lease_gen == session->s_cap_gen &&
2741 di->lease_renew_from &&
2742 di->lease_renew_after == 0) {
2743 unsigned long duration =
2744 le32_to_cpu(h->duration_ms) * HZ / 1000;
2746 di->lease_seq = seq;
2747 dentry->d_time = di->lease_renew_from + duration;
2748 di->lease_renew_after = di->lease_renew_from +
2750 di->lease_renew_from = 0;
2754 spin_unlock(&dentry->d_lock);
2761 /* let's just reuse the same message */
2762 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2764 ceph_con_send(&session->s_con, msg);
2768 mutex_unlock(&session->s_mutex);
2772 pr_err("corrupt lease message\n");
2776 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2777 struct inode *inode,
2778 struct dentry *dentry, char action,
2781 struct ceph_msg *msg;
2782 struct ceph_mds_lease *lease;
2783 int len = sizeof(*lease) + sizeof(u32);
2786 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2787 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2788 dnamelen = dentry->d_name.len;
2791 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS);
2794 lease = msg->front.iov_base;
2795 lease->action = action;
2796 lease->mask = cpu_to_le16(1);
2797 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2798 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2799 lease->seq = cpu_to_le32(seq);
2800 put_unaligned_le32(dnamelen, lease + 1);
2801 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2804 * if this is a preemptive lease RELEASE, no need to
2805 * flush request stream, since the actual request will
2808 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2810 ceph_con_send(&session->s_con, msg);
2814 * Preemptively release a lease we expect to invalidate anyway.
2815 * Pass @inode always, @dentry is optional.
2817 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2818 struct dentry *dentry, int mask)
2820 struct ceph_dentry_info *di;
2821 struct ceph_mds_session *session;
2824 BUG_ON(inode == NULL);
2825 BUG_ON(dentry == NULL);
2828 /* is dentry lease valid? */
2829 spin_lock(&dentry->d_lock);
2830 di = ceph_dentry(dentry);
2831 if (!di || !di->lease_session ||
2832 di->lease_session->s_mds < 0 ||
2833 di->lease_gen != di->lease_session->s_cap_gen ||
2834 !time_before(jiffies, dentry->d_time)) {
2835 dout("lease_release inode %p dentry %p -- "
2837 inode, dentry, mask);
2838 spin_unlock(&dentry->d_lock);
2842 /* we do have a lease on this dentry; note mds and seq */
2843 session = ceph_get_mds_session(di->lease_session);
2844 seq = di->lease_seq;
2845 __ceph_mdsc_drop_dentry_lease(dentry);
2846 spin_unlock(&dentry->d_lock);
2848 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2849 inode, dentry, mask, session->s_mds);
2850 ceph_mdsc_lease_send_msg(session, inode, dentry,
2851 CEPH_MDS_LEASE_RELEASE, seq);
2852 ceph_put_mds_session(session);
2856 * drop all leases (and dentry refs) in preparation for umount
2858 static void drop_leases(struct ceph_mds_client *mdsc)
2862 dout("drop_leases\n");
2863 mutex_lock(&mdsc->mutex);
2864 for (i = 0; i < mdsc->max_sessions; i++) {
2865 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2868 mutex_unlock(&mdsc->mutex);
2869 mutex_lock(&s->s_mutex);
2870 mutex_unlock(&s->s_mutex);
2871 ceph_put_mds_session(s);
2872 mutex_lock(&mdsc->mutex);
2874 mutex_unlock(&mdsc->mutex);
2880 * delayed work -- periodically trim expired leases, renew caps with mds
2882 static void schedule_delayed(struct ceph_mds_client *mdsc)
2885 unsigned hz = round_jiffies_relative(HZ * delay);
2886 schedule_delayed_work(&mdsc->delayed_work, hz);
2889 static void delayed_work(struct work_struct *work)
2892 struct ceph_mds_client *mdsc =
2893 container_of(work, struct ceph_mds_client, delayed_work.work);
2897 dout("mdsc delayed_work\n");
2898 ceph_check_delayed_caps(mdsc);
2900 mutex_lock(&mdsc->mutex);
2901 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2902 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2903 mdsc->last_renew_caps);
2905 mdsc->last_renew_caps = jiffies;
2907 for (i = 0; i < mdsc->max_sessions; i++) {
2908 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2911 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2912 dout("resending session close request for mds%d\n",
2914 request_close_session(mdsc, s);
2915 ceph_put_mds_session(s);
2918 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2919 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2920 s->s_state = CEPH_MDS_SESSION_HUNG;
2921 pr_info("mds%d hung\n", s->s_mds);
2924 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2925 /* this mds is failed or recovering, just wait */
2926 ceph_put_mds_session(s);
2929 mutex_unlock(&mdsc->mutex);
2931 mutex_lock(&s->s_mutex);
2933 send_renew_caps(mdsc, s);
2935 ceph_con_keepalive(&s->s_con);
2936 ceph_add_cap_releases(mdsc, s);
2937 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2938 s->s_state == CEPH_MDS_SESSION_HUNG)
2939 ceph_send_cap_releases(mdsc, s);
2940 mutex_unlock(&s->s_mutex);
2941 ceph_put_mds_session(s);
2943 mutex_lock(&mdsc->mutex);
2945 mutex_unlock(&mdsc->mutex);
2947 schedule_delayed(mdsc);
2950 int ceph_mdsc_init(struct ceph_fs_client *fsc)
2953 struct ceph_mds_client *mdsc;
2955 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
2960 mutex_init(&mdsc->mutex);
2961 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
2962 if (mdsc->mdsmap == NULL)
2965 init_completion(&mdsc->safe_umount_waiters);
2966 init_waitqueue_head(&mdsc->session_close_wq);
2967 INIT_LIST_HEAD(&mdsc->waiting_for_map);
2968 mdsc->sessions = NULL;
2969 mdsc->max_sessions = 0;
2971 init_rwsem(&mdsc->snap_rwsem);
2972 mdsc->snap_realms = RB_ROOT;
2973 INIT_LIST_HEAD(&mdsc->snap_empty);
2974 spin_lock_init(&mdsc->snap_empty_lock);
2976 mdsc->request_tree = RB_ROOT;
2977 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
2978 mdsc->last_renew_caps = jiffies;
2979 INIT_LIST_HEAD(&mdsc->cap_delay_list);
2980 spin_lock_init(&mdsc->cap_delay_lock);
2981 INIT_LIST_HEAD(&mdsc->snap_flush_list);
2982 spin_lock_init(&mdsc->snap_flush_lock);
2983 mdsc->cap_flush_seq = 0;
2984 INIT_LIST_HEAD(&mdsc->cap_dirty);
2985 mdsc->num_cap_flushing = 0;
2986 spin_lock_init(&mdsc->cap_dirty_lock);
2987 init_waitqueue_head(&mdsc->cap_flushing_wq);
2988 spin_lock_init(&mdsc->dentry_lru_lock);
2989 INIT_LIST_HEAD(&mdsc->dentry_lru);
2991 ceph_caps_init(mdsc);
2992 ceph_adjust_min_caps(mdsc, fsc->min_caps);
2998 * Wait for safe replies on open mds requests. If we time out, drop
2999 * all requests from the tree to avoid dangling dentry refs.
3001 static void wait_requests(struct ceph_mds_client *mdsc)
3003 struct ceph_mds_request *req;
3004 struct ceph_fs_client *fsc = mdsc->fsc;
3006 mutex_lock(&mdsc->mutex);
3007 if (__get_oldest_req(mdsc)) {
3008 mutex_unlock(&mdsc->mutex);
3010 dout("wait_requests waiting for requests\n");
3011 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3012 fsc->client->options->mount_timeout * HZ);
3014 /* tear down remaining requests */
3015 mutex_lock(&mdsc->mutex);
3016 while ((req = __get_oldest_req(mdsc))) {
3017 dout("wait_requests timed out on tid %llu\n",
3019 __unregister_request(mdsc, req);
3022 mutex_unlock(&mdsc->mutex);
3023 dout("wait_requests done\n");
3027 * called before mount is ro, and before dentries are torn down.
3028 * (hmm, does this still race with new lookups?)
3030 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3032 dout("pre_umount\n");
3036 ceph_flush_dirty_caps(mdsc);
3037 wait_requests(mdsc);
3040 * wait for reply handlers to drop their request refs and
3041 * their inode/dcache refs
3047 * wait for all write mds requests to flush.
3049 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3051 struct ceph_mds_request *req = NULL, *nextreq;
3054 mutex_lock(&mdsc->mutex);
3055 dout("wait_unsafe_requests want %lld\n", want_tid);
3057 req = __get_oldest_req(mdsc);
3058 while (req && req->r_tid <= want_tid) {
3059 /* find next request */
3060 n = rb_next(&req->r_node);
3062 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3065 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3067 ceph_mdsc_get_request(req);
3069 ceph_mdsc_get_request(nextreq);
3070 mutex_unlock(&mdsc->mutex);
3071 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3072 req->r_tid, want_tid);
3073 wait_for_completion(&req->r_safe_completion);
3074 mutex_lock(&mdsc->mutex);
3075 ceph_mdsc_put_request(req);
3077 break; /* next dne before, so we're done! */
3078 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3079 /* next request was removed from tree */
3080 ceph_mdsc_put_request(nextreq);
3083 ceph_mdsc_put_request(nextreq); /* won't go away */
3087 mutex_unlock(&mdsc->mutex);
3088 dout("wait_unsafe_requests done\n");
3091 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3093 u64 want_tid, want_flush;
3095 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3099 mutex_lock(&mdsc->mutex);
3100 want_tid = mdsc->last_tid;
3101 want_flush = mdsc->cap_flush_seq;
3102 mutex_unlock(&mdsc->mutex);
3103 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3105 ceph_flush_dirty_caps(mdsc);
3107 wait_unsafe_requests(mdsc, want_tid);
3108 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3112 * true if all sessions are closed, or we force unmount
3114 bool done_closing_sessions(struct ceph_mds_client *mdsc)
3118 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3121 mutex_lock(&mdsc->mutex);
3122 for (i = 0; i < mdsc->max_sessions; i++)
3123 if (mdsc->sessions[i])
3125 mutex_unlock(&mdsc->mutex);
3130 * called after sb is ro.
3132 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3134 struct ceph_mds_session *session;
3136 struct ceph_fs_client *fsc = mdsc->fsc;
3137 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3139 dout("close_sessions\n");
3141 /* close sessions */
3142 mutex_lock(&mdsc->mutex);
3143 for (i = 0; i < mdsc->max_sessions; i++) {
3144 session = __ceph_lookup_mds_session(mdsc, i);
3147 mutex_unlock(&mdsc->mutex);
3148 mutex_lock(&session->s_mutex);
3149 __close_session(mdsc, session);
3150 mutex_unlock(&session->s_mutex);
3151 ceph_put_mds_session(session);
3152 mutex_lock(&mdsc->mutex);
3154 mutex_unlock(&mdsc->mutex);
3156 dout("waiting for sessions to close\n");
3157 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3160 /* tear down remaining sessions */
3161 mutex_lock(&mdsc->mutex);
3162 for (i = 0; i < mdsc->max_sessions; i++) {
3163 if (mdsc->sessions[i]) {
3164 session = get_session(mdsc->sessions[i]);
3165 __unregister_session(mdsc, session);
3166 mutex_unlock(&mdsc->mutex);
3167 mutex_lock(&session->s_mutex);
3168 remove_session_caps(session);
3169 mutex_unlock(&session->s_mutex);
3170 ceph_put_mds_session(session);
3171 mutex_lock(&mdsc->mutex);
3174 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3175 mutex_unlock(&mdsc->mutex);
3177 ceph_cleanup_empty_realms(mdsc);
3179 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3184 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3187 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3189 ceph_mdsmap_destroy(mdsc->mdsmap);
3190 kfree(mdsc->sessions);
3191 ceph_caps_finalize(mdsc);
3194 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3196 struct ceph_mds_client *mdsc = fsc->mdsc;
3198 ceph_mdsc_stop(mdsc);
3205 * handle mds map update.
3207 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3211 void *p = msg->front.iov_base;
3212 void *end = p + msg->front.iov_len;
3213 struct ceph_mdsmap *newmap, *oldmap;
3214 struct ceph_fsid fsid;
3217 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3218 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3219 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3221 epoch = ceph_decode_32(&p);
3222 maplen = ceph_decode_32(&p);
3223 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3225 /* do we need it? */
3226 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3227 mutex_lock(&mdsc->mutex);
3228 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3229 dout("handle_map epoch %u <= our %u\n",
3230 epoch, mdsc->mdsmap->m_epoch);
3231 mutex_unlock(&mdsc->mutex);
3235 newmap = ceph_mdsmap_decode(&p, end);
3236 if (IS_ERR(newmap)) {
3237 err = PTR_ERR(newmap);
3241 /* swap into place */
3243 oldmap = mdsc->mdsmap;
3244 mdsc->mdsmap = newmap;
3245 check_new_map(mdsc, newmap, oldmap);
3246 ceph_mdsmap_destroy(oldmap);
3248 mdsc->mdsmap = newmap; /* first mds map */
3250 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3252 __wake_requests(mdsc, &mdsc->waiting_for_map);
3254 mutex_unlock(&mdsc->mutex);
3255 schedule_delayed(mdsc);
3259 mutex_unlock(&mdsc->mutex);
3261 pr_err("error decoding mdsmap %d\n", err);
3265 static struct ceph_connection *con_get(struct ceph_connection *con)
3267 struct ceph_mds_session *s = con->private;
3269 if (get_session(s)) {
3270 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3273 dout("mdsc con_get %p FAIL\n", s);
3277 static void con_put(struct ceph_connection *con)
3279 struct ceph_mds_session *s = con->private;
3281 ceph_put_mds_session(s);
3282 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref));
3286 * if the client is unresponsive for long enough, the mds will kill
3287 * the session entirely.
3289 static void peer_reset(struct ceph_connection *con)
3291 struct ceph_mds_session *s = con->private;
3292 struct ceph_mds_client *mdsc = s->s_mdsc;
3294 pr_warning("mds%d closed our session\n", s->s_mds);
3295 send_mds_reconnect(mdsc, s);
3298 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3300 struct ceph_mds_session *s = con->private;
3301 struct ceph_mds_client *mdsc = s->s_mdsc;
3302 int type = le16_to_cpu(msg->hdr.type);
3304 mutex_lock(&mdsc->mutex);
3305 if (__verify_registered_session(mdsc, s) < 0) {
3306 mutex_unlock(&mdsc->mutex);
3309 mutex_unlock(&mdsc->mutex);
3312 case CEPH_MSG_MDS_MAP:
3313 ceph_mdsc_handle_map(mdsc, msg);
3315 case CEPH_MSG_CLIENT_SESSION:
3316 handle_session(s, msg);
3318 case CEPH_MSG_CLIENT_REPLY:
3319 handle_reply(s, msg);
3321 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3322 handle_forward(mdsc, s, msg);
3324 case CEPH_MSG_CLIENT_CAPS:
3325 ceph_handle_caps(s, msg);
3327 case CEPH_MSG_CLIENT_SNAP:
3328 ceph_handle_snap(mdsc, s, msg);
3330 case CEPH_MSG_CLIENT_LEASE:
3331 handle_lease(mdsc, s, msg);
3335 pr_err("received unknown message type %d %s\n", type,
3336 ceph_msg_type_name(type));
3345 static int get_authorizer(struct ceph_connection *con,
3346 void **buf, int *len, int *proto,
3347 void **reply_buf, int *reply_len, int force_new)
3349 struct ceph_mds_session *s = con->private;
3350 struct ceph_mds_client *mdsc = s->s_mdsc;
3351 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3354 if (force_new && s->s_authorizer) {
3355 ac->ops->destroy_authorizer(ac, s->s_authorizer);
3356 s->s_authorizer = NULL;
3358 if (s->s_authorizer == NULL) {
3359 if (ac->ops->create_authorizer) {
3360 ret = ac->ops->create_authorizer(
3361 ac, CEPH_ENTITY_TYPE_MDS,
3363 &s->s_authorizer_buf,
3364 &s->s_authorizer_buf_len,
3365 &s->s_authorizer_reply_buf,
3366 &s->s_authorizer_reply_buf_len);
3372 *proto = ac->protocol;
3373 *buf = s->s_authorizer_buf;
3374 *len = s->s_authorizer_buf_len;
3375 *reply_buf = s->s_authorizer_reply_buf;
3376 *reply_len = s->s_authorizer_reply_buf_len;
3381 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3383 struct ceph_mds_session *s = con->private;
3384 struct ceph_mds_client *mdsc = s->s_mdsc;
3385 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3387 return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
3390 static int invalidate_authorizer(struct ceph_connection *con)
3392 struct ceph_mds_session *s = con->private;
3393 struct ceph_mds_client *mdsc = s->s_mdsc;
3394 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3396 if (ac->ops->invalidate_authorizer)
3397 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3399 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3402 static const struct ceph_connection_operations mds_con_ops = {
3405 .dispatch = dispatch,
3406 .get_authorizer = get_authorizer,
3407 .verify_authorizer_reply = verify_authorizer_reply,
3408 .invalidate_authorizer = invalidate_authorizer,
3409 .peer_reset = peer_reset,