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42 * are no longer valid.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 complete_all(&req->r_safe_completion);
647 ceph_mdsc_put_request(req);
651 * Choose mds to send request to next. If there is a hint set in the
652 * request (e.g., due to a prior forward hint from the mds), use that.
653 * Otherwise, consult frag tree and/or caps to identify the
654 * appropriate mds. If all else fails, choose randomly.
656 * Called under mdsc->mutex.
658 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
661 * we don't need to worry about protecting the d_parent access
662 * here because we never renaming inside the snapped namespace
663 * except to resplice to another snapdir, and either the old or new
664 * result is a valid result.
666 while (!IS_ROOT(dentry) && ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
667 dentry = dentry->d_parent;
671 static int __choose_mds(struct ceph_mds_client *mdsc,
672 struct ceph_mds_request *req)
675 struct ceph_inode_info *ci;
676 struct ceph_cap *cap;
677 int mode = req->r_direct_mode;
679 u32 hash = req->r_direct_hash;
680 bool is_hash = req->r_direct_is_hash;
683 * is there a specific mds we should try? ignore hint if we have
684 * no session and the mds is not up (active or recovering).
686 if (req->r_resend_mds >= 0 &&
687 (__have_session(mdsc, req->r_resend_mds) ||
688 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
689 dout("choose_mds using resend_mds mds%d\n",
691 return req->r_resend_mds;
694 if (mode == USE_RANDOM_MDS)
699 inode = req->r_inode;
700 } else if (req->r_dentry) {
701 /* ignore race with rename; old or new d_parent is okay */
702 struct dentry *parent = req->r_dentry->d_parent;
703 struct inode *dir = parent->d_inode;
705 if (dir->i_sb != mdsc->fsc->sb) {
707 inode = req->r_dentry->d_inode;
708 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
709 /* direct snapped/virtual snapdir requests
710 * based on parent dir inode */
711 struct dentry *dn = get_nonsnap_parent(parent);
713 dout("__choose_mds using nonsnap parent %p\n", inode);
714 } else if (req->r_dentry->d_inode) {
716 inode = req->r_dentry->d_inode;
720 hash = ceph_dentry_hash(dir, req->r_dentry);
725 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
729 ci = ceph_inode(inode);
731 if (is_hash && S_ISDIR(inode->i_mode)) {
732 struct ceph_inode_frag frag;
735 ceph_choose_frag(ci, hash, &frag, &found);
737 if (mode == USE_ANY_MDS && frag.ndist > 0) {
740 /* choose a random replica */
741 get_random_bytes(&r, 1);
744 dout("choose_mds %p %llx.%llx "
745 "frag %u mds%d (%d/%d)\n",
746 inode, ceph_vinop(inode),
749 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
750 CEPH_MDS_STATE_ACTIVE)
754 /* since this file/dir wasn't known to be
755 * replicated, then we want to look for the
756 * authoritative mds. */
759 /* choose auth mds */
761 dout("choose_mds %p %llx.%llx "
762 "frag %u mds%d (auth)\n",
763 inode, ceph_vinop(inode), frag.frag, mds);
764 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
765 CEPH_MDS_STATE_ACTIVE)
771 spin_lock(&ci->i_ceph_lock);
773 if (mode == USE_AUTH_MDS)
774 cap = ci->i_auth_cap;
775 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
776 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
778 spin_unlock(&ci->i_ceph_lock);
781 mds = cap->session->s_mds;
782 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
783 inode, ceph_vinop(inode), mds,
784 cap == ci->i_auth_cap ? "auth " : "", cap);
785 spin_unlock(&ci->i_ceph_lock);
789 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
790 dout("choose_mds chose random mds%d\n", mds);
798 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
800 struct ceph_msg *msg;
801 struct ceph_mds_session_head *h;
803 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
806 pr_err("create_session_msg ENOMEM creating msg\n");
809 h = msg->front.iov_base;
810 h->op = cpu_to_le32(op);
811 h->seq = cpu_to_le64(seq);
816 * send session open request.
818 * called under mdsc->mutex
820 static int __open_session(struct ceph_mds_client *mdsc,
821 struct ceph_mds_session *session)
823 struct ceph_msg *msg;
825 int mds = session->s_mds;
827 /* wait for mds to go active? */
828 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
829 dout("open_session to mds%d (%s)\n", mds,
830 ceph_mds_state_name(mstate));
831 session->s_state = CEPH_MDS_SESSION_OPENING;
832 session->s_renew_requested = jiffies;
834 /* send connect message */
835 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
838 ceph_con_send(&session->s_con, msg);
843 * open sessions for any export targets for the given mds
845 * called under mdsc->mutex
847 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
848 struct ceph_mds_session *session)
850 struct ceph_mds_info *mi;
851 struct ceph_mds_session *ts;
852 int i, mds = session->s_mds;
855 if (mds >= mdsc->mdsmap->m_max_mds)
857 mi = &mdsc->mdsmap->m_info[mds];
858 dout("open_export_target_sessions for mds%d (%d targets)\n",
859 session->s_mds, mi->num_export_targets);
861 for (i = 0; i < mi->num_export_targets; i++) {
862 target = mi->export_targets[i];
863 ts = __ceph_lookup_mds_session(mdsc, target);
865 ts = register_session(mdsc, target);
869 if (session->s_state == CEPH_MDS_SESSION_NEW ||
870 session->s_state == CEPH_MDS_SESSION_CLOSING)
871 __open_session(mdsc, session);
873 dout(" mds%d target mds%d %p is %s\n", session->s_mds,
874 i, ts, session_state_name(ts->s_state));
875 ceph_put_mds_session(ts);
879 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
880 struct ceph_mds_session *session)
882 mutex_lock(&mdsc->mutex);
883 __open_export_target_sessions(mdsc, session);
884 mutex_unlock(&mdsc->mutex);
892 * Free preallocated cap messages assigned to this session
894 static void cleanup_cap_releases(struct ceph_mds_session *session)
896 struct ceph_msg *msg;
898 spin_lock(&session->s_cap_lock);
899 while (!list_empty(&session->s_cap_releases)) {
900 msg = list_first_entry(&session->s_cap_releases,
901 struct ceph_msg, list_head);
902 list_del_init(&msg->list_head);
905 while (!list_empty(&session->s_cap_releases_done)) {
906 msg = list_first_entry(&session->s_cap_releases_done,
907 struct ceph_msg, list_head);
908 list_del_init(&msg->list_head);
911 spin_unlock(&session->s_cap_lock);
915 * Helper to safely iterate over all caps associated with a session, with
916 * special care taken to handle a racing __ceph_remove_cap().
918 * Caller must hold session s_mutex.
920 static int iterate_session_caps(struct ceph_mds_session *session,
921 int (*cb)(struct inode *, struct ceph_cap *,
925 struct ceph_cap *cap;
926 struct inode *inode, *last_inode = NULL;
927 struct ceph_cap *old_cap = NULL;
930 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
931 spin_lock(&session->s_cap_lock);
932 p = session->s_caps.next;
933 while (p != &session->s_caps) {
934 cap = list_entry(p, struct ceph_cap, session_caps);
935 inode = igrab(&cap->ci->vfs_inode);
940 session->s_cap_iterator = cap;
941 spin_unlock(&session->s_cap_lock);
948 ceph_put_cap(session->s_mdsc, old_cap);
952 ret = cb(inode, cap, arg);
955 spin_lock(&session->s_cap_lock);
957 if (cap->ci == NULL) {
958 dout("iterate_session_caps finishing cap %p removal\n",
960 BUG_ON(cap->session != session);
961 list_del_init(&cap->session_caps);
962 session->s_nr_caps--;
964 old_cap = cap; /* put_cap it w/o locks held */
971 session->s_cap_iterator = NULL;
972 spin_unlock(&session->s_cap_lock);
977 ceph_put_cap(session->s_mdsc, old_cap);
982 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
985 struct ceph_inode_info *ci = ceph_inode(inode);
988 dout("removing cap %p, ci is %p, inode is %p\n",
989 cap, ci, &ci->vfs_inode);
990 spin_lock(&ci->i_ceph_lock);
991 __ceph_remove_cap(cap);
992 if (!__ceph_is_any_real_caps(ci)) {
993 struct ceph_mds_client *mdsc =
994 ceph_sb_to_client(inode->i_sb)->mdsc;
996 spin_lock(&mdsc->cap_dirty_lock);
997 if (!list_empty(&ci->i_dirty_item)) {
998 pr_info(" dropping dirty %s state for %p %lld\n",
999 ceph_cap_string(ci->i_dirty_caps),
1000 inode, ceph_ino(inode));
1001 ci->i_dirty_caps = 0;
1002 list_del_init(&ci->i_dirty_item);
1005 if (!list_empty(&ci->i_flushing_item)) {
1006 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1007 ceph_cap_string(ci->i_flushing_caps),
1008 inode, ceph_ino(inode));
1009 ci->i_flushing_caps = 0;
1010 list_del_init(&ci->i_flushing_item);
1011 mdsc->num_cap_flushing--;
1014 if (drop && ci->i_wrbuffer_ref) {
1015 pr_info(" dropping dirty data for %p %lld\n",
1016 inode, ceph_ino(inode));
1017 ci->i_wrbuffer_ref = 0;
1018 ci->i_wrbuffer_ref_head = 0;
1021 spin_unlock(&mdsc->cap_dirty_lock);
1023 spin_unlock(&ci->i_ceph_lock);
1030 * caller must hold session s_mutex
1032 static void remove_session_caps(struct ceph_mds_session *session)
1034 dout("remove_session_caps on %p\n", session);
1035 iterate_session_caps(session, remove_session_caps_cb, NULL);
1036 BUG_ON(session->s_nr_caps > 0);
1037 BUG_ON(!list_empty(&session->s_cap_flushing));
1038 cleanup_cap_releases(session);
1042 * wake up any threads waiting on this session's caps. if the cap is
1043 * old (didn't get renewed on the client reconnect), remove it now.
1045 * caller must hold s_mutex.
1047 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1050 struct ceph_inode_info *ci = ceph_inode(inode);
1052 wake_up_all(&ci->i_cap_wq);
1054 spin_lock(&ci->i_ceph_lock);
1055 ci->i_wanted_max_size = 0;
1056 ci->i_requested_max_size = 0;
1057 spin_unlock(&ci->i_ceph_lock);
1062 static void wake_up_session_caps(struct ceph_mds_session *session,
1065 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1066 iterate_session_caps(session, wake_up_session_cb,
1067 (void *)(unsigned long)reconnect);
1071 * Send periodic message to MDS renewing all currently held caps. The
1072 * ack will reset the expiration for all caps from this session.
1074 * caller holds s_mutex
1076 static int send_renew_caps(struct ceph_mds_client *mdsc,
1077 struct ceph_mds_session *session)
1079 struct ceph_msg *msg;
1082 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1083 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1084 pr_info("mds%d caps stale\n", session->s_mds);
1085 session->s_renew_requested = jiffies;
1087 /* do not try to renew caps until a recovering mds has reconnected
1088 * with its clients. */
1089 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1090 if (state < CEPH_MDS_STATE_RECONNECT) {
1091 dout("send_renew_caps ignoring mds%d (%s)\n",
1092 session->s_mds, ceph_mds_state_name(state));
1096 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1097 ceph_mds_state_name(state));
1098 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1099 ++session->s_renew_seq);
1102 ceph_con_send(&session->s_con, msg);
1107 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1109 * Called under session->s_mutex
1111 static void renewed_caps(struct ceph_mds_client *mdsc,
1112 struct ceph_mds_session *session, int is_renew)
1117 spin_lock(&session->s_cap_lock);
1118 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1120 session->s_cap_ttl = session->s_renew_requested +
1121 mdsc->mdsmap->m_session_timeout*HZ;
1124 if (time_before(jiffies, session->s_cap_ttl)) {
1125 pr_info("mds%d caps renewed\n", session->s_mds);
1128 pr_info("mds%d caps still stale\n", session->s_mds);
1131 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1132 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1133 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1134 spin_unlock(&session->s_cap_lock);
1137 wake_up_session_caps(session, 0);
1141 * send a session close request
1143 static int request_close_session(struct ceph_mds_client *mdsc,
1144 struct ceph_mds_session *session)
1146 struct ceph_msg *msg;
1148 dout("request_close_session mds%d state %s seq %lld\n",
1149 session->s_mds, session_state_name(session->s_state),
1151 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1154 ceph_con_send(&session->s_con, msg);
1159 * Called with s_mutex held.
1161 static int __close_session(struct ceph_mds_client *mdsc,
1162 struct ceph_mds_session *session)
1164 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1166 session->s_state = CEPH_MDS_SESSION_CLOSING;
1167 return request_close_session(mdsc, session);
1171 * Trim old(er) caps.
1173 * Because we can't cache an inode without one or more caps, we do
1174 * this indirectly: if a cap is unused, we prune its aliases, at which
1175 * point the inode will hopefully get dropped to.
1177 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1178 * memory pressure from the MDS, though, so it needn't be perfect.
1180 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1182 struct ceph_mds_session *session = arg;
1183 struct ceph_inode_info *ci = ceph_inode(inode);
1184 int used, oissued, mine;
1186 if (session->s_trim_caps <= 0)
1189 spin_lock(&ci->i_ceph_lock);
1190 mine = cap->issued | cap->implemented;
1191 used = __ceph_caps_used(ci);
1192 oissued = __ceph_caps_issued_other(ci, cap);
1194 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1195 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1196 ceph_cap_string(used));
1197 if (ci->i_dirty_caps)
1198 goto out; /* dirty caps */
1199 if ((used & ~oissued) & mine)
1200 goto out; /* we need these caps */
1202 session->s_trim_caps--;
1204 /* we aren't the only cap.. just remove us */
1205 __queue_cap_release(session, ceph_ino(inode), cap->cap_id,
1206 cap->mseq, cap->issue_seq);
1207 __ceph_remove_cap(cap);
1209 /* try to drop referring dentries */
1210 spin_unlock(&ci->i_ceph_lock);
1211 d_prune_aliases(inode);
1212 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1213 inode, cap, atomic_read(&inode->i_count));
1218 spin_unlock(&ci->i_ceph_lock);
1223 * Trim session cap count down to some max number.
1225 static int trim_caps(struct ceph_mds_client *mdsc,
1226 struct ceph_mds_session *session,
1229 int trim_caps = session->s_nr_caps - max_caps;
1231 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1232 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1233 if (trim_caps > 0) {
1234 session->s_trim_caps = trim_caps;
1235 iterate_session_caps(session, trim_caps_cb, session);
1236 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1237 session->s_mds, session->s_nr_caps, max_caps,
1238 trim_caps - session->s_trim_caps);
1239 session->s_trim_caps = 0;
1245 * Allocate cap_release messages. If there is a partially full message
1246 * in the queue, try to allocate enough to cover it's remainder, so that
1247 * we can send it immediately.
1249 * Called under s_mutex.
1251 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1252 struct ceph_mds_session *session)
1254 struct ceph_msg *msg, *partial = NULL;
1255 struct ceph_mds_cap_release *head;
1257 int extra = mdsc->fsc->mount_options->cap_release_safety;
1260 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1263 spin_lock(&session->s_cap_lock);
1265 if (!list_empty(&session->s_cap_releases)) {
1266 msg = list_first_entry(&session->s_cap_releases,
1269 head = msg->front.iov_base;
1270 num = le32_to_cpu(head->num);
1272 dout(" partial %p with (%d/%d)\n", msg, num,
1273 (int)CEPH_CAPS_PER_RELEASE);
1274 extra += CEPH_CAPS_PER_RELEASE - num;
1278 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1279 spin_unlock(&session->s_cap_lock);
1280 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1284 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1285 (int)msg->front.iov_len);
1286 head = msg->front.iov_base;
1287 head->num = cpu_to_le32(0);
1288 msg->front.iov_len = sizeof(*head);
1289 spin_lock(&session->s_cap_lock);
1290 list_add(&msg->list_head, &session->s_cap_releases);
1291 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1295 head = partial->front.iov_base;
1296 num = le32_to_cpu(head->num);
1297 dout(" queueing partial %p with %d/%d\n", partial, num,
1298 (int)CEPH_CAPS_PER_RELEASE);
1299 list_move_tail(&partial->list_head,
1300 &session->s_cap_releases_done);
1301 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1304 spin_unlock(&session->s_cap_lock);
1310 * flush all dirty inode data to disk.
1312 * returns true if we've flushed through want_flush_seq
1314 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1318 dout("check_cap_flush want %lld\n", want_flush_seq);
1319 mutex_lock(&mdsc->mutex);
1320 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1321 struct ceph_mds_session *session = mdsc->sessions[mds];
1325 get_session(session);
1326 mutex_unlock(&mdsc->mutex);
1328 mutex_lock(&session->s_mutex);
1329 if (!list_empty(&session->s_cap_flushing)) {
1330 struct ceph_inode_info *ci =
1331 list_entry(session->s_cap_flushing.next,
1332 struct ceph_inode_info,
1334 struct inode *inode = &ci->vfs_inode;
1336 spin_lock(&ci->i_ceph_lock);
1337 if (ci->i_cap_flush_seq <= want_flush_seq) {
1338 dout("check_cap_flush still flushing %p "
1339 "seq %lld <= %lld to mds%d\n", inode,
1340 ci->i_cap_flush_seq, want_flush_seq,
1344 spin_unlock(&ci->i_ceph_lock);
1346 mutex_unlock(&session->s_mutex);
1347 ceph_put_mds_session(session);
1351 mutex_lock(&mdsc->mutex);
1354 mutex_unlock(&mdsc->mutex);
1355 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1360 * called under s_mutex
1362 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1363 struct ceph_mds_session *session)
1365 struct ceph_msg *msg;
1367 dout("send_cap_releases mds%d\n", session->s_mds);
1368 spin_lock(&session->s_cap_lock);
1369 while (!list_empty(&session->s_cap_releases_done)) {
1370 msg = list_first_entry(&session->s_cap_releases_done,
1371 struct ceph_msg, list_head);
1372 list_del_init(&msg->list_head);
1373 spin_unlock(&session->s_cap_lock);
1374 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1375 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1376 ceph_con_send(&session->s_con, msg);
1377 spin_lock(&session->s_cap_lock);
1379 spin_unlock(&session->s_cap_lock);
1382 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1383 struct ceph_mds_session *session)
1385 struct ceph_msg *msg;
1386 struct ceph_mds_cap_release *head;
1389 dout("discard_cap_releases mds%d\n", session->s_mds);
1390 spin_lock(&session->s_cap_lock);
1392 /* zero out the in-progress message */
1393 msg = list_first_entry(&session->s_cap_releases,
1394 struct ceph_msg, list_head);
1395 head = msg->front.iov_base;
1396 num = le32_to_cpu(head->num);
1397 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1398 head->num = cpu_to_le32(0);
1399 session->s_num_cap_releases += num;
1401 /* requeue completed messages */
1402 while (!list_empty(&session->s_cap_releases_done)) {
1403 msg = list_first_entry(&session->s_cap_releases_done,
1404 struct ceph_msg, list_head);
1405 list_del_init(&msg->list_head);
1407 head = msg->front.iov_base;
1408 num = le32_to_cpu(head->num);
1409 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1411 session->s_num_cap_releases += num;
1412 head->num = cpu_to_le32(0);
1413 msg->front.iov_len = sizeof(*head);
1414 list_add(&msg->list_head, &session->s_cap_releases);
1417 spin_unlock(&session->s_cap_lock);
1425 * Create an mds request.
1427 struct ceph_mds_request *
1428 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1430 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1433 return ERR_PTR(-ENOMEM);
1435 mutex_init(&req->r_fill_mutex);
1437 req->r_started = jiffies;
1438 req->r_resend_mds = -1;
1439 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1441 kref_init(&req->r_kref);
1442 INIT_LIST_HEAD(&req->r_wait);
1443 init_completion(&req->r_completion);
1444 init_completion(&req->r_safe_completion);
1445 INIT_LIST_HEAD(&req->r_unsafe_item);
1448 req->r_direct_mode = mode;
1453 * return oldest (lowest) request, tid in request tree, 0 if none.
1455 * called under mdsc->mutex.
1457 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1459 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1461 return rb_entry(rb_first(&mdsc->request_tree),
1462 struct ceph_mds_request, r_node);
1465 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1467 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1475 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1476 * on build_path_from_dentry in fs/cifs/dir.c.
1478 * If @stop_on_nosnap, generate path relative to the first non-snapped
1481 * Encode hidden .snap dirs as a double /, i.e.
1482 * foo/.snap/bar -> foo//bar
1484 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1487 struct dentry *temp;
1493 return ERR_PTR(-EINVAL);
1497 seq = read_seqbegin(&rename_lock);
1499 for (temp = dentry; !IS_ROOT(temp);) {
1500 struct inode *inode = temp->d_inode;
1501 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1502 len++; /* slash only */
1503 else if (stop_on_nosnap && inode &&
1504 ceph_snap(inode) == CEPH_NOSNAP)
1507 len += 1 + temp->d_name.len;
1508 temp = temp->d_parent;
1512 len--; /* no leading '/' */
1514 path = kmalloc(len+1, GFP_NOFS);
1516 return ERR_PTR(-ENOMEM);
1518 path[pos] = 0; /* trailing null */
1520 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1521 struct inode *inode;
1523 spin_lock(&temp->d_lock);
1524 inode = temp->d_inode;
1525 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1526 dout("build_path path+%d: %p SNAPDIR\n",
1528 } else if (stop_on_nosnap && inode &&
1529 ceph_snap(inode) == CEPH_NOSNAP) {
1530 spin_unlock(&temp->d_lock);
1533 pos -= temp->d_name.len;
1535 spin_unlock(&temp->d_lock);
1538 strncpy(path + pos, temp->d_name.name,
1541 spin_unlock(&temp->d_lock);
1544 temp = temp->d_parent;
1547 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1548 pr_err("build_path did not end path lookup where "
1549 "expected, namelen is %d, pos is %d\n", len, pos);
1550 /* presumably this is only possible if racing with a
1551 rename of one of the parent directories (we can not
1552 lock the dentries above us to prevent this, but
1553 retrying should be harmless) */
1558 *base = ceph_ino(temp->d_inode);
1560 dout("build_path on %p %d built %llx '%.*s'\n",
1561 dentry, dentry->d_count, *base, len, path);
1565 static int build_dentry_path(struct dentry *dentry,
1566 const char **ppath, int *ppathlen, u64 *pino,
1571 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1572 *pino = ceph_ino(dentry->d_parent->d_inode);
1573 *ppath = dentry->d_name.name;
1574 *ppathlen = dentry->d_name.len;
1577 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1579 return PTR_ERR(path);
1585 static int build_inode_path(struct inode *inode,
1586 const char **ppath, int *ppathlen, u64 *pino,
1589 struct dentry *dentry;
1592 if (ceph_snap(inode) == CEPH_NOSNAP) {
1593 *pino = ceph_ino(inode);
1597 dentry = d_find_alias(inode);
1598 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1601 return PTR_ERR(path);
1608 * request arguments may be specified via an inode *, a dentry *, or
1609 * an explicit ino+path.
1611 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1612 const char *rpath, u64 rino,
1613 const char **ppath, int *pathlen,
1614 u64 *ino, int *freepath)
1619 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1620 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1622 } else if (rdentry) {
1623 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1624 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1626 } else if (rpath || rino) {
1629 *pathlen = rpath ? strlen(rpath) : 0;
1630 dout(" path %.*s\n", *pathlen, rpath);
1637 * called under mdsc->mutex
1639 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1640 struct ceph_mds_request *req,
1643 struct ceph_msg *msg;
1644 struct ceph_mds_request_head *head;
1645 const char *path1 = NULL;
1646 const char *path2 = NULL;
1647 u64 ino1 = 0, ino2 = 0;
1648 int pathlen1 = 0, pathlen2 = 0;
1649 int freepath1 = 0, freepath2 = 0;
1655 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1656 req->r_path1, req->r_ino1.ino,
1657 &path1, &pathlen1, &ino1, &freepath1);
1663 ret = set_request_path_attr(NULL, req->r_old_dentry,
1664 req->r_path2, req->r_ino2.ino,
1665 &path2, &pathlen2, &ino2, &freepath2);
1671 len = sizeof(*head) +
1672 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1674 /* calculate (max) length for cap releases */
1675 len += sizeof(struct ceph_mds_request_release) *
1676 (!!req->r_inode_drop + !!req->r_dentry_drop +
1677 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1678 if (req->r_dentry_drop)
1679 len += req->r_dentry->d_name.len;
1680 if (req->r_old_dentry_drop)
1681 len += req->r_old_dentry->d_name.len;
1683 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1685 msg = ERR_PTR(-ENOMEM);
1689 msg->hdr.tid = cpu_to_le64(req->r_tid);
1691 head = msg->front.iov_base;
1692 p = msg->front.iov_base + sizeof(*head);
1693 end = msg->front.iov_base + msg->front.iov_len;
1695 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1696 head->op = cpu_to_le32(req->r_op);
1697 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1698 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1699 head->args = req->r_args;
1701 ceph_encode_filepath(&p, end, ino1, path1);
1702 ceph_encode_filepath(&p, end, ino2, path2);
1704 /* make note of release offset, in case we need to replay */
1705 req->r_request_release_offset = p - msg->front.iov_base;
1709 if (req->r_inode_drop)
1710 releases += ceph_encode_inode_release(&p,
1711 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1712 mds, req->r_inode_drop, req->r_inode_unless, 0);
1713 if (req->r_dentry_drop)
1714 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1715 mds, req->r_dentry_drop, req->r_dentry_unless);
1716 if (req->r_old_dentry_drop)
1717 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1718 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1719 if (req->r_old_inode_drop)
1720 releases += ceph_encode_inode_release(&p,
1721 req->r_old_dentry->d_inode,
1722 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1723 head->num_releases = cpu_to_le16(releases);
1726 msg->front.iov_len = p - msg->front.iov_base;
1727 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1729 if (req->r_data_len) {
1730 /* outbound data set only by ceph_sync_setxattr() */
1731 BUG_ON(!req->r_pages);
1732 ceph_msg_data_add_pages(msg, req->r_pages, req->r_data_len, 0);
1735 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1736 msg->hdr.data_off = cpu_to_le16(0);
1740 kfree((char *)path2);
1743 kfree((char *)path1);
1749 * called under mdsc->mutex if error, under no mutex if
1752 static void complete_request(struct ceph_mds_client *mdsc,
1753 struct ceph_mds_request *req)
1755 if (req->r_callback)
1756 req->r_callback(mdsc, req);
1758 complete_all(&req->r_completion);
1762 * called under mdsc->mutex
1764 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1765 struct ceph_mds_request *req,
1768 struct ceph_mds_request_head *rhead;
1769 struct ceph_msg *msg;
1774 struct ceph_cap *cap =
1775 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
1778 req->r_sent_on_mseq = cap->mseq;
1780 req->r_sent_on_mseq = -1;
1782 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1783 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1785 if (req->r_got_unsafe) {
1787 * Replay. Do not regenerate message (and rebuild
1788 * paths, etc.); just use the original message.
1789 * Rebuilding paths will break for renames because
1790 * d_move mangles the src name.
1792 msg = req->r_request;
1793 rhead = msg->front.iov_base;
1795 flags = le32_to_cpu(rhead->flags);
1796 flags |= CEPH_MDS_FLAG_REPLAY;
1797 rhead->flags = cpu_to_le32(flags);
1799 if (req->r_target_inode)
1800 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1802 rhead->num_retry = req->r_attempts - 1;
1804 /* remove cap/dentry releases from message */
1805 rhead->num_releases = 0;
1806 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1807 msg->front.iov_len = req->r_request_release_offset;
1811 if (req->r_request) {
1812 ceph_msg_put(req->r_request);
1813 req->r_request = NULL;
1815 msg = create_request_message(mdsc, req, mds);
1817 req->r_err = PTR_ERR(msg);
1818 complete_request(mdsc, req);
1819 return PTR_ERR(msg);
1821 req->r_request = msg;
1823 rhead = msg->front.iov_base;
1824 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1825 if (req->r_got_unsafe)
1826 flags |= CEPH_MDS_FLAG_REPLAY;
1827 if (req->r_locked_dir)
1828 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1829 rhead->flags = cpu_to_le32(flags);
1830 rhead->num_fwd = req->r_num_fwd;
1831 rhead->num_retry = req->r_attempts - 1;
1834 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1839 * send request, or put it on the appropriate wait list.
1841 static int __do_request(struct ceph_mds_client *mdsc,
1842 struct ceph_mds_request *req)
1844 struct ceph_mds_session *session = NULL;
1848 if (req->r_err || req->r_got_result) {
1850 __unregister_request(mdsc, req);
1854 if (req->r_timeout &&
1855 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1856 dout("do_request timed out\n");
1861 put_request_session(req);
1863 mds = __choose_mds(mdsc, req);
1865 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1866 dout("do_request no mds or not active, waiting for map\n");
1867 list_add(&req->r_wait, &mdsc->waiting_for_map);
1871 /* get, open session */
1872 session = __ceph_lookup_mds_session(mdsc, mds);
1874 session = register_session(mdsc, mds);
1875 if (IS_ERR(session)) {
1876 err = PTR_ERR(session);
1880 req->r_session = get_session(session);
1882 dout("do_request mds%d session %p state %s\n", mds, session,
1883 session_state_name(session->s_state));
1884 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1885 session->s_state != CEPH_MDS_SESSION_HUNG) {
1886 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1887 session->s_state == CEPH_MDS_SESSION_CLOSING)
1888 __open_session(mdsc, session);
1889 list_add(&req->r_wait, &session->s_waiting);
1894 req->r_resend_mds = -1; /* forget any previous mds hint */
1896 if (req->r_request_started == 0) /* note request start time */
1897 req->r_request_started = jiffies;
1899 err = __prepare_send_request(mdsc, req, mds);
1901 ceph_msg_get(req->r_request);
1902 ceph_con_send(&session->s_con, req->r_request);
1906 ceph_put_mds_session(session);
1912 complete_request(mdsc, req);
1917 * called under mdsc->mutex
1919 static void __wake_requests(struct ceph_mds_client *mdsc,
1920 struct list_head *head)
1922 struct ceph_mds_request *req;
1923 LIST_HEAD(tmp_list);
1925 list_splice_init(head, &tmp_list);
1927 while (!list_empty(&tmp_list)) {
1928 req = list_entry(tmp_list.next,
1929 struct ceph_mds_request, r_wait);
1930 list_del_init(&req->r_wait);
1931 dout(" wake request %p tid %llu\n", req, req->r_tid);
1932 __do_request(mdsc, req);
1937 * Wake up threads with requests pending for @mds, so that they can
1938 * resubmit their requests to a possibly different mds.
1940 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1942 struct ceph_mds_request *req;
1945 dout("kick_requests mds%d\n", mds);
1946 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1947 req = rb_entry(p, struct ceph_mds_request, r_node);
1948 if (req->r_got_unsafe)
1950 if (req->r_session &&
1951 req->r_session->s_mds == mds) {
1952 dout(" kicking tid %llu\n", req->r_tid);
1953 __do_request(mdsc, req);
1958 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1959 struct ceph_mds_request *req)
1961 dout("submit_request on %p\n", req);
1962 mutex_lock(&mdsc->mutex);
1963 __register_request(mdsc, req, NULL);
1964 __do_request(mdsc, req);
1965 mutex_unlock(&mdsc->mutex);
1969 * Synchrously perform an mds request. Take care of all of the
1970 * session setup, forwarding, retry details.
1972 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1974 struct ceph_mds_request *req)
1978 dout("do_request on %p\n", req);
1980 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1982 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1983 if (req->r_locked_dir)
1984 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1985 if (req->r_old_dentry)
1986 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
1990 mutex_lock(&mdsc->mutex);
1991 __register_request(mdsc, req, dir);
1992 __do_request(mdsc, req);
1996 __unregister_request(mdsc, req);
1997 dout("do_request early error %d\n", err);
2002 mutex_unlock(&mdsc->mutex);
2003 dout("do_request waiting\n");
2004 if (req->r_timeout) {
2005 err = (long)wait_for_completion_killable_timeout(
2006 &req->r_completion, req->r_timeout);
2010 err = wait_for_completion_killable(&req->r_completion);
2012 dout("do_request waited, got %d\n", err);
2013 mutex_lock(&mdsc->mutex);
2015 /* only abort if we didn't race with a real reply */
2016 if (req->r_got_result) {
2017 err = le32_to_cpu(req->r_reply_info.head->result);
2018 } else if (err < 0) {
2019 dout("aborted request %lld with %d\n", req->r_tid, err);
2022 * ensure we aren't running concurrently with
2023 * ceph_fill_trace or ceph_readdir_prepopulate, which
2024 * rely on locks (dir mutex) held by our caller.
2026 mutex_lock(&req->r_fill_mutex);
2028 req->r_aborted = true;
2029 mutex_unlock(&req->r_fill_mutex);
2031 if (req->r_locked_dir &&
2032 (req->r_op & CEPH_MDS_OP_WRITE))
2033 ceph_invalidate_dir_request(req);
2039 mutex_unlock(&mdsc->mutex);
2040 dout("do_request %p done, result %d\n", req, err);
2045 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2046 * namespace request.
2048 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2050 struct inode *inode = req->r_locked_dir;
2052 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2054 ceph_dir_clear_complete(inode);
2056 ceph_invalidate_dentry_lease(req->r_dentry);
2057 if (req->r_old_dentry)
2058 ceph_invalidate_dentry_lease(req->r_old_dentry);
2064 * We take the session mutex and parse and process the reply immediately.
2065 * This preserves the logical ordering of replies, capabilities, etc., sent
2066 * by the MDS as they are applied to our local cache.
2068 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2070 struct ceph_mds_client *mdsc = session->s_mdsc;
2071 struct ceph_mds_request *req;
2072 struct ceph_mds_reply_head *head = msg->front.iov_base;
2073 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2076 int mds = session->s_mds;
2078 if (msg->front.iov_len < sizeof(*head)) {
2079 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2084 /* get request, session */
2085 tid = le64_to_cpu(msg->hdr.tid);
2086 mutex_lock(&mdsc->mutex);
2087 req = __lookup_request(mdsc, tid);
2089 dout("handle_reply on unknown tid %llu\n", tid);
2090 mutex_unlock(&mdsc->mutex);
2093 dout("handle_reply %p\n", req);
2095 /* correct session? */
2096 if (req->r_session != session) {
2097 pr_err("mdsc_handle_reply got %llu on session mds%d"
2098 " not mds%d\n", tid, session->s_mds,
2099 req->r_session ? req->r_session->s_mds : -1);
2100 mutex_unlock(&mdsc->mutex);
2105 if ((req->r_got_unsafe && !head->safe) ||
2106 (req->r_got_safe && head->safe)) {
2107 pr_warning("got a dup %s reply on %llu from mds%d\n",
2108 head->safe ? "safe" : "unsafe", tid, mds);
2109 mutex_unlock(&mdsc->mutex);
2112 if (req->r_got_safe && !head->safe) {
2113 pr_warning("got unsafe after safe on %llu from mds%d\n",
2115 mutex_unlock(&mdsc->mutex);
2119 result = le32_to_cpu(head->result);
2123 * if we're not talking to the authority, send to them
2124 * if the authority has changed while we weren't looking,
2125 * send to new authority
2126 * Otherwise we just have to return an ESTALE
2128 if (result == -ESTALE) {
2129 dout("got ESTALE on request %llu", req->r_tid);
2130 if (!req->r_inode) {
2131 /* do nothing; not an authority problem */
2132 } else if (req->r_direct_mode != USE_AUTH_MDS) {
2133 dout("not using auth, setting for that now");
2134 req->r_direct_mode = USE_AUTH_MDS;
2135 __do_request(mdsc, req);
2136 mutex_unlock(&mdsc->mutex);
2139 struct ceph_inode_info *ci = ceph_inode(req->r_inode);
2140 struct ceph_cap *cap = NULL;
2143 cap = ceph_get_cap_for_mds(ci,
2144 req->r_session->s_mds);
2146 dout("already using auth");
2147 if ((!cap || cap != ci->i_auth_cap) ||
2148 (cap->mseq != req->r_sent_on_mseq)) {
2149 dout("but cap changed, so resending");
2150 __do_request(mdsc, req);
2151 mutex_unlock(&mdsc->mutex);
2155 dout("have to return ESTALE on request %llu", req->r_tid);
2160 req->r_got_safe = true;
2161 __unregister_request(mdsc, req);
2163 if (req->r_got_unsafe) {
2165 * We already handled the unsafe response, now do the
2166 * cleanup. No need to examine the response; the MDS
2167 * doesn't include any result info in the safe
2168 * response. And even if it did, there is nothing
2169 * useful we could do with a revised return value.
2171 dout("got safe reply %llu, mds%d\n", tid, mds);
2172 list_del_init(&req->r_unsafe_item);
2174 /* last unsafe request during umount? */
2175 if (mdsc->stopping && !__get_oldest_req(mdsc))
2176 complete_all(&mdsc->safe_umount_waiters);
2177 mutex_unlock(&mdsc->mutex);
2181 req->r_got_unsafe = true;
2182 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2185 dout("handle_reply tid %lld result %d\n", tid, result);
2186 rinfo = &req->r_reply_info;
2187 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2188 mutex_unlock(&mdsc->mutex);
2190 mutex_lock(&session->s_mutex);
2192 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2198 if (rinfo->snapblob_len) {
2199 down_write(&mdsc->snap_rwsem);
2200 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2201 rinfo->snapblob + rinfo->snapblob_len,
2202 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
2203 downgrade_write(&mdsc->snap_rwsem);
2205 down_read(&mdsc->snap_rwsem);
2208 /* insert trace into our cache */
2209 mutex_lock(&req->r_fill_mutex);
2210 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2212 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2213 req->r_op == CEPH_MDS_OP_LSSNAP) &&
2215 ceph_readdir_prepopulate(req, req->r_session);
2216 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2218 mutex_unlock(&req->r_fill_mutex);
2220 up_read(&mdsc->snap_rwsem);
2222 mutex_lock(&mdsc->mutex);
2223 if (!req->r_aborted) {
2229 req->r_got_result = true;
2232 dout("reply arrived after request %lld was aborted\n", tid);
2234 mutex_unlock(&mdsc->mutex);
2236 ceph_add_cap_releases(mdsc, req->r_session);
2237 mutex_unlock(&session->s_mutex);
2239 /* kick calling process */
2240 complete_request(mdsc, req);
2242 ceph_mdsc_put_request(req);
2249 * handle mds notification that our request has been forwarded.
2251 static void handle_forward(struct ceph_mds_client *mdsc,
2252 struct ceph_mds_session *session,
2253 struct ceph_msg *msg)
2255 struct ceph_mds_request *req;
2256 u64 tid = le64_to_cpu(msg->hdr.tid);
2260 void *p = msg->front.iov_base;
2261 void *end = p + msg->front.iov_len;
2263 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2264 next_mds = ceph_decode_32(&p);
2265 fwd_seq = ceph_decode_32(&p);
2267 mutex_lock(&mdsc->mutex);
2268 req = __lookup_request(mdsc, tid);
2270 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2271 goto out; /* dup reply? */
2274 if (req->r_aborted) {
2275 dout("forward tid %llu aborted, unregistering\n", tid);
2276 __unregister_request(mdsc, req);
2277 } else if (fwd_seq <= req->r_num_fwd) {
2278 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2279 tid, next_mds, req->r_num_fwd, fwd_seq);
2281 /* resend. forward race not possible; mds would drop */
2282 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2284 BUG_ON(req->r_got_result);
2285 req->r_num_fwd = fwd_seq;
2286 req->r_resend_mds = next_mds;
2287 put_request_session(req);
2288 __do_request(mdsc, req);
2290 ceph_mdsc_put_request(req);
2292 mutex_unlock(&mdsc->mutex);
2296 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2300 * handle a mds session control message
2302 static void handle_session(struct ceph_mds_session *session,
2303 struct ceph_msg *msg)
2305 struct ceph_mds_client *mdsc = session->s_mdsc;
2308 int mds = session->s_mds;
2309 struct ceph_mds_session_head *h = msg->front.iov_base;
2313 if (msg->front.iov_len != sizeof(*h))
2315 op = le32_to_cpu(h->op);
2316 seq = le64_to_cpu(h->seq);
2318 mutex_lock(&mdsc->mutex);
2319 if (op == CEPH_SESSION_CLOSE)
2320 __unregister_session(mdsc, session);
2321 /* FIXME: this ttl calculation is generous */
2322 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2323 mutex_unlock(&mdsc->mutex);
2325 mutex_lock(&session->s_mutex);
2327 dout("handle_session mds%d %s %p state %s seq %llu\n",
2328 mds, ceph_session_op_name(op), session,
2329 session_state_name(session->s_state), seq);
2331 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2332 session->s_state = CEPH_MDS_SESSION_OPEN;
2333 pr_info("mds%d came back\n", session->s_mds);
2337 case CEPH_SESSION_OPEN:
2338 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2339 pr_info("mds%d reconnect success\n", session->s_mds);
2340 session->s_state = CEPH_MDS_SESSION_OPEN;
2341 renewed_caps(mdsc, session, 0);
2344 __close_session(mdsc, session);
2347 case CEPH_SESSION_RENEWCAPS:
2348 if (session->s_renew_seq == seq)
2349 renewed_caps(mdsc, session, 1);
2352 case CEPH_SESSION_CLOSE:
2353 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2354 pr_info("mds%d reconnect denied\n", session->s_mds);
2355 remove_session_caps(session);
2356 wake = 1; /* for good measure */
2357 wake_up_all(&mdsc->session_close_wq);
2358 kick_requests(mdsc, mds);
2361 case CEPH_SESSION_STALE:
2362 pr_info("mds%d caps went stale, renewing\n",
2364 spin_lock(&session->s_gen_ttl_lock);
2365 session->s_cap_gen++;
2366 session->s_cap_ttl = jiffies - 1;
2367 spin_unlock(&session->s_gen_ttl_lock);
2368 send_renew_caps(mdsc, session);
2371 case CEPH_SESSION_RECALL_STATE:
2372 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2376 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2380 mutex_unlock(&session->s_mutex);
2382 mutex_lock(&mdsc->mutex);
2383 __wake_requests(mdsc, &session->s_waiting);
2384 mutex_unlock(&mdsc->mutex);
2389 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2390 (int)msg->front.iov_len);
2397 * called under session->mutex.
2399 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2400 struct ceph_mds_session *session)
2402 struct ceph_mds_request *req, *nreq;
2405 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2407 mutex_lock(&mdsc->mutex);
2408 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2409 err = __prepare_send_request(mdsc, req, session->s_mds);
2411 ceph_msg_get(req->r_request);
2412 ceph_con_send(&session->s_con, req->r_request);
2415 mutex_unlock(&mdsc->mutex);
2419 * Encode information about a cap for a reconnect with the MDS.
2421 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2425 struct ceph_mds_cap_reconnect v2;
2426 struct ceph_mds_cap_reconnect_v1 v1;
2429 struct ceph_inode_info *ci;
2430 struct ceph_reconnect_state *recon_state = arg;
2431 struct ceph_pagelist *pagelist = recon_state->pagelist;
2435 struct dentry *dentry;
2439 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2440 inode, ceph_vinop(inode), cap, cap->cap_id,
2441 ceph_cap_string(cap->issued));
2442 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2446 dentry = d_find_alias(inode);
2448 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2450 err = PTR_ERR(path);
2457 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2461 spin_lock(&ci->i_ceph_lock);
2462 cap->seq = 0; /* reset cap seq */
2463 cap->issue_seq = 0; /* and issue_seq */
2465 if (recon_state->flock) {
2466 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2467 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2468 rec.v2.issued = cpu_to_le32(cap->issued);
2469 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2470 rec.v2.pathbase = cpu_to_le64(pathbase);
2471 rec.v2.flock_len = 0;
2472 reclen = sizeof(rec.v2);
2474 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2475 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2476 rec.v1.issued = cpu_to_le32(cap->issued);
2477 rec.v1.size = cpu_to_le64(inode->i_size);
2478 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2479 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2480 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2481 rec.v1.pathbase = cpu_to_le64(pathbase);
2482 reclen = sizeof(rec.v1);
2484 spin_unlock(&ci->i_ceph_lock);
2486 if (recon_state->flock) {
2487 int num_fcntl_locks, num_flock_locks;
2488 struct ceph_filelock *flocks;
2492 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2494 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2495 sizeof(struct ceph_filelock), GFP_NOFS);
2501 err = ceph_encode_locks_to_buffer(inode, flocks,
2512 * number of encoded locks is stable, so copy to pagelist
2514 rec.v2.flock_len = cpu_to_le32(2*sizeof(u32) +
2515 (num_fcntl_locks+num_flock_locks) *
2516 sizeof(struct ceph_filelock));
2517 err = ceph_pagelist_append(pagelist, &rec, reclen);
2519 err = ceph_locks_to_pagelist(flocks, pagelist,
2524 err = ceph_pagelist_append(pagelist, &rec, reclen);
2535 * If an MDS fails and recovers, clients need to reconnect in order to
2536 * reestablish shared state. This includes all caps issued through
2537 * this session _and_ the snap_realm hierarchy. Because it's not
2538 * clear which snap realms the mds cares about, we send everything we
2539 * know about.. that ensures we'll then get any new info the
2540 * recovering MDS might have.
2542 * This is a relatively heavyweight operation, but it's rare.
2544 * called with mdsc->mutex held.
2546 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2547 struct ceph_mds_session *session)
2549 struct ceph_msg *reply;
2551 int mds = session->s_mds;
2553 struct ceph_pagelist *pagelist;
2554 struct ceph_reconnect_state recon_state;
2556 pr_info("mds%d reconnect start\n", mds);
2558 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2560 goto fail_nopagelist;
2561 ceph_pagelist_init(pagelist);
2563 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2567 mutex_lock(&session->s_mutex);
2568 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2571 ceph_con_close(&session->s_con);
2572 ceph_con_open(&session->s_con,
2573 CEPH_ENTITY_TYPE_MDS, mds,
2574 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2576 /* replay unsafe requests */
2577 replay_unsafe_requests(mdsc, session);
2579 down_read(&mdsc->snap_rwsem);
2581 dout("session %p state %s\n", session,
2582 session_state_name(session->s_state));
2584 /* drop old cap expires; we're about to reestablish that state */
2585 discard_cap_releases(mdsc, session);
2587 /* traverse this session's caps */
2588 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2592 recon_state.pagelist = pagelist;
2593 recon_state.flock = session->s_con.peer_features & CEPH_FEATURE_FLOCK;
2594 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
2599 * snaprealms. we provide mds with the ino, seq (version), and
2600 * parent for all of our realms. If the mds has any newer info,
2603 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2604 struct ceph_snap_realm *realm =
2605 rb_entry(p, struct ceph_snap_realm, node);
2606 struct ceph_mds_snaprealm_reconnect sr_rec;
2608 dout(" adding snap realm %llx seq %lld parent %llx\n",
2609 realm->ino, realm->seq, realm->parent_ino);
2610 sr_rec.ino = cpu_to_le64(realm->ino);
2611 sr_rec.seq = cpu_to_le64(realm->seq);
2612 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2613 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2618 if (recon_state.flock)
2619 reply->hdr.version = cpu_to_le16(2);
2620 if (pagelist->length) {
2621 /* set up outbound data if we have any */
2622 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2623 ceph_msg_data_add_pagelist(reply, pagelist);
2625 ceph_con_send(&session->s_con, reply);
2627 mutex_unlock(&session->s_mutex);
2629 mutex_lock(&mdsc->mutex);
2630 __wake_requests(mdsc, &session->s_waiting);
2631 mutex_unlock(&mdsc->mutex);
2633 up_read(&mdsc->snap_rwsem);
2637 ceph_msg_put(reply);
2638 up_read(&mdsc->snap_rwsem);
2639 mutex_unlock(&session->s_mutex);
2641 ceph_pagelist_release(pagelist);
2644 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2650 * compare old and new mdsmaps, kicking requests
2651 * and closing out old connections as necessary
2653 * called under mdsc->mutex.
2655 static void check_new_map(struct ceph_mds_client *mdsc,
2656 struct ceph_mdsmap *newmap,
2657 struct ceph_mdsmap *oldmap)
2660 int oldstate, newstate;
2661 struct ceph_mds_session *s;
2663 dout("check_new_map new %u old %u\n",
2664 newmap->m_epoch, oldmap->m_epoch);
2666 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2667 if (mdsc->sessions[i] == NULL)
2669 s = mdsc->sessions[i];
2670 oldstate = ceph_mdsmap_get_state(oldmap, i);
2671 newstate = ceph_mdsmap_get_state(newmap, i);
2673 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2674 i, ceph_mds_state_name(oldstate),
2675 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2676 ceph_mds_state_name(newstate),
2677 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2678 session_state_name(s->s_state));
2680 if (i >= newmap->m_max_mds ||
2681 memcmp(ceph_mdsmap_get_addr(oldmap, i),
2682 ceph_mdsmap_get_addr(newmap, i),
2683 sizeof(struct ceph_entity_addr))) {
2684 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2685 /* the session never opened, just close it
2687 __wake_requests(mdsc, &s->s_waiting);
2688 __unregister_session(mdsc, s);
2691 mutex_unlock(&mdsc->mutex);
2692 mutex_lock(&s->s_mutex);
2693 mutex_lock(&mdsc->mutex);
2694 ceph_con_close(&s->s_con);
2695 mutex_unlock(&s->s_mutex);
2696 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2699 /* kick any requests waiting on the recovering mds */
2700 kick_requests(mdsc, i);
2701 } else if (oldstate == newstate) {
2702 continue; /* nothing new with this mds */
2708 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2709 newstate >= CEPH_MDS_STATE_RECONNECT) {
2710 mutex_unlock(&mdsc->mutex);
2711 send_mds_reconnect(mdsc, s);
2712 mutex_lock(&mdsc->mutex);
2716 * kick request on any mds that has gone active.
2718 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2719 newstate >= CEPH_MDS_STATE_ACTIVE) {
2720 if (oldstate != CEPH_MDS_STATE_CREATING &&
2721 oldstate != CEPH_MDS_STATE_STARTING)
2722 pr_info("mds%d recovery completed\n", s->s_mds);
2723 kick_requests(mdsc, i);
2724 ceph_kick_flushing_caps(mdsc, s);
2725 wake_up_session_caps(s, 1);
2729 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
2730 s = mdsc->sessions[i];
2733 if (!ceph_mdsmap_is_laggy(newmap, i))
2735 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2736 s->s_state == CEPH_MDS_SESSION_HUNG ||
2737 s->s_state == CEPH_MDS_SESSION_CLOSING) {
2738 dout(" connecting to export targets of laggy mds%d\n",
2740 __open_export_target_sessions(mdsc, s);
2752 * caller must hold session s_mutex, dentry->d_lock
2754 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2756 struct ceph_dentry_info *di = ceph_dentry(dentry);
2758 ceph_put_mds_session(di->lease_session);
2759 di->lease_session = NULL;
2762 static void handle_lease(struct ceph_mds_client *mdsc,
2763 struct ceph_mds_session *session,
2764 struct ceph_msg *msg)
2766 struct super_block *sb = mdsc->fsc->sb;
2767 struct inode *inode;
2768 struct dentry *parent, *dentry;
2769 struct ceph_dentry_info *di;
2770 int mds = session->s_mds;
2771 struct ceph_mds_lease *h = msg->front.iov_base;
2773 struct ceph_vino vino;
2777 dout("handle_lease from mds%d\n", mds);
2780 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2782 vino.ino = le64_to_cpu(h->ino);
2783 vino.snap = CEPH_NOSNAP;
2784 seq = le32_to_cpu(h->seq);
2785 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2786 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2787 if (dname.len != get_unaligned_le32(h+1))
2790 mutex_lock(&session->s_mutex);
2794 inode = ceph_find_inode(sb, vino);
2795 dout("handle_lease %s, ino %llx %p %.*s\n",
2796 ceph_lease_op_name(h->action), vino.ino, inode,
2797 dname.len, dname.name);
2798 if (inode == NULL) {
2799 dout("handle_lease no inode %llx\n", vino.ino);
2804 parent = d_find_alias(inode);
2806 dout("no parent dentry on inode %p\n", inode);
2808 goto release; /* hrm... */
2810 dname.hash = full_name_hash(dname.name, dname.len);
2811 dentry = d_lookup(parent, &dname);
2816 spin_lock(&dentry->d_lock);
2817 di = ceph_dentry(dentry);
2818 switch (h->action) {
2819 case CEPH_MDS_LEASE_REVOKE:
2820 if (di->lease_session == session) {
2821 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2822 h->seq = cpu_to_le32(di->lease_seq);
2823 __ceph_mdsc_drop_dentry_lease(dentry);
2828 case CEPH_MDS_LEASE_RENEW:
2829 if (di->lease_session == session &&
2830 di->lease_gen == session->s_cap_gen &&
2831 di->lease_renew_from &&
2832 di->lease_renew_after == 0) {
2833 unsigned long duration =
2834 le32_to_cpu(h->duration_ms) * HZ / 1000;
2836 di->lease_seq = seq;
2837 dentry->d_time = di->lease_renew_from + duration;
2838 di->lease_renew_after = di->lease_renew_from +
2840 di->lease_renew_from = 0;
2844 spin_unlock(&dentry->d_lock);
2851 /* let's just reuse the same message */
2852 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2854 ceph_con_send(&session->s_con, msg);
2858 mutex_unlock(&session->s_mutex);
2862 pr_err("corrupt lease message\n");
2866 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2867 struct inode *inode,
2868 struct dentry *dentry, char action,
2871 struct ceph_msg *msg;
2872 struct ceph_mds_lease *lease;
2873 int len = sizeof(*lease) + sizeof(u32);
2876 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2877 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2878 dnamelen = dentry->d_name.len;
2881 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
2884 lease = msg->front.iov_base;
2885 lease->action = action;
2886 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2887 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2888 lease->seq = cpu_to_le32(seq);
2889 put_unaligned_le32(dnamelen, lease + 1);
2890 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2893 * if this is a preemptive lease RELEASE, no need to
2894 * flush request stream, since the actual request will
2897 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2899 ceph_con_send(&session->s_con, msg);
2903 * Preemptively release a lease we expect to invalidate anyway.
2904 * Pass @inode always, @dentry is optional.
2906 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2907 struct dentry *dentry)
2909 struct ceph_dentry_info *di;
2910 struct ceph_mds_session *session;
2913 BUG_ON(inode == NULL);
2914 BUG_ON(dentry == NULL);
2916 /* is dentry lease valid? */
2917 spin_lock(&dentry->d_lock);
2918 di = ceph_dentry(dentry);
2919 if (!di || !di->lease_session ||
2920 di->lease_session->s_mds < 0 ||
2921 di->lease_gen != di->lease_session->s_cap_gen ||
2922 !time_before(jiffies, dentry->d_time)) {
2923 dout("lease_release inode %p dentry %p -- "
2926 spin_unlock(&dentry->d_lock);
2930 /* we do have a lease on this dentry; note mds and seq */
2931 session = ceph_get_mds_session(di->lease_session);
2932 seq = di->lease_seq;
2933 __ceph_mdsc_drop_dentry_lease(dentry);
2934 spin_unlock(&dentry->d_lock);
2936 dout("lease_release inode %p dentry %p to mds%d\n",
2937 inode, dentry, session->s_mds);
2938 ceph_mdsc_lease_send_msg(session, inode, dentry,
2939 CEPH_MDS_LEASE_RELEASE, seq);
2940 ceph_put_mds_session(session);
2944 * drop all leases (and dentry refs) in preparation for umount
2946 static void drop_leases(struct ceph_mds_client *mdsc)
2950 dout("drop_leases\n");
2951 mutex_lock(&mdsc->mutex);
2952 for (i = 0; i < mdsc->max_sessions; i++) {
2953 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2956 mutex_unlock(&mdsc->mutex);
2957 mutex_lock(&s->s_mutex);
2958 mutex_unlock(&s->s_mutex);
2959 ceph_put_mds_session(s);
2960 mutex_lock(&mdsc->mutex);
2962 mutex_unlock(&mdsc->mutex);
2968 * delayed work -- periodically trim expired leases, renew caps with mds
2970 static void schedule_delayed(struct ceph_mds_client *mdsc)
2973 unsigned hz = round_jiffies_relative(HZ * delay);
2974 schedule_delayed_work(&mdsc->delayed_work, hz);
2977 static void delayed_work(struct work_struct *work)
2980 struct ceph_mds_client *mdsc =
2981 container_of(work, struct ceph_mds_client, delayed_work.work);
2985 dout("mdsc delayed_work\n");
2986 ceph_check_delayed_caps(mdsc);
2988 mutex_lock(&mdsc->mutex);
2989 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2990 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2991 mdsc->last_renew_caps);
2993 mdsc->last_renew_caps = jiffies;
2995 for (i = 0; i < mdsc->max_sessions; i++) {
2996 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2999 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3000 dout("resending session close request for mds%d\n",
3002 request_close_session(mdsc, s);
3003 ceph_put_mds_session(s);
3006 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3007 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3008 s->s_state = CEPH_MDS_SESSION_HUNG;
3009 pr_info("mds%d hung\n", s->s_mds);
3012 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
3013 /* this mds is failed or recovering, just wait */
3014 ceph_put_mds_session(s);
3017 mutex_unlock(&mdsc->mutex);
3019 mutex_lock(&s->s_mutex);
3021 send_renew_caps(mdsc, s);
3023 ceph_con_keepalive(&s->s_con);
3024 ceph_add_cap_releases(mdsc, s);
3025 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3026 s->s_state == CEPH_MDS_SESSION_HUNG)
3027 ceph_send_cap_releases(mdsc, s);
3028 mutex_unlock(&s->s_mutex);
3029 ceph_put_mds_session(s);
3031 mutex_lock(&mdsc->mutex);
3033 mutex_unlock(&mdsc->mutex);
3035 schedule_delayed(mdsc);
3038 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3041 struct ceph_mds_client *mdsc;
3043 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3048 mutex_init(&mdsc->mutex);
3049 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3050 if (mdsc->mdsmap == NULL) {
3055 init_completion(&mdsc->safe_umount_waiters);
3056 init_waitqueue_head(&mdsc->session_close_wq);
3057 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3058 mdsc->sessions = NULL;
3059 mdsc->max_sessions = 0;
3061 init_rwsem(&mdsc->snap_rwsem);
3062 mdsc->snap_realms = RB_ROOT;
3063 INIT_LIST_HEAD(&mdsc->snap_empty);
3064 spin_lock_init(&mdsc->snap_empty_lock);
3066 mdsc->request_tree = RB_ROOT;
3067 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3068 mdsc->last_renew_caps = jiffies;
3069 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3070 spin_lock_init(&mdsc->cap_delay_lock);
3071 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3072 spin_lock_init(&mdsc->snap_flush_lock);
3073 mdsc->cap_flush_seq = 0;
3074 INIT_LIST_HEAD(&mdsc->cap_dirty);
3075 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3076 mdsc->num_cap_flushing = 0;
3077 spin_lock_init(&mdsc->cap_dirty_lock);
3078 init_waitqueue_head(&mdsc->cap_flushing_wq);
3079 spin_lock_init(&mdsc->dentry_lru_lock);
3080 INIT_LIST_HEAD(&mdsc->dentry_lru);
3082 ceph_caps_init(mdsc);
3083 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3089 * Wait for safe replies on open mds requests. If we time out, drop
3090 * all requests from the tree to avoid dangling dentry refs.
3092 static void wait_requests(struct ceph_mds_client *mdsc)
3094 struct ceph_mds_request *req;
3095 struct ceph_fs_client *fsc = mdsc->fsc;
3097 mutex_lock(&mdsc->mutex);
3098 if (__get_oldest_req(mdsc)) {
3099 mutex_unlock(&mdsc->mutex);
3101 dout("wait_requests waiting for requests\n");
3102 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3103 fsc->client->options->mount_timeout * HZ);
3105 /* tear down remaining requests */
3106 mutex_lock(&mdsc->mutex);
3107 while ((req = __get_oldest_req(mdsc))) {
3108 dout("wait_requests timed out on tid %llu\n",
3110 __unregister_request(mdsc, req);
3113 mutex_unlock(&mdsc->mutex);
3114 dout("wait_requests done\n");
3118 * called before mount is ro, and before dentries are torn down.
3119 * (hmm, does this still race with new lookups?)
3121 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3123 dout("pre_umount\n");
3127 ceph_flush_dirty_caps(mdsc);
3128 wait_requests(mdsc);
3131 * wait for reply handlers to drop their request refs and
3132 * their inode/dcache refs
3138 * wait for all write mds requests to flush.
3140 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3142 struct ceph_mds_request *req = NULL, *nextreq;
3145 mutex_lock(&mdsc->mutex);
3146 dout("wait_unsafe_requests want %lld\n", want_tid);
3148 req = __get_oldest_req(mdsc);
3149 while (req && req->r_tid <= want_tid) {
3150 /* find next request */
3151 n = rb_next(&req->r_node);
3153 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3156 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
3158 ceph_mdsc_get_request(req);
3160 ceph_mdsc_get_request(nextreq);
3161 mutex_unlock(&mdsc->mutex);
3162 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3163 req->r_tid, want_tid);
3164 wait_for_completion(&req->r_safe_completion);
3165 mutex_lock(&mdsc->mutex);
3166 ceph_mdsc_put_request(req);
3168 break; /* next dne before, so we're done! */
3169 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3170 /* next request was removed from tree */
3171 ceph_mdsc_put_request(nextreq);
3174 ceph_mdsc_put_request(nextreq); /* won't go away */
3178 mutex_unlock(&mdsc->mutex);
3179 dout("wait_unsafe_requests done\n");
3182 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3184 u64 want_tid, want_flush;
3186 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3190 mutex_lock(&mdsc->mutex);
3191 want_tid = mdsc->last_tid;
3192 want_flush = mdsc->cap_flush_seq;
3193 mutex_unlock(&mdsc->mutex);
3194 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
3196 ceph_flush_dirty_caps(mdsc);
3198 wait_unsafe_requests(mdsc, want_tid);
3199 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
3203 * true if all sessions are closed, or we force unmount
3205 static bool done_closing_sessions(struct ceph_mds_client *mdsc)
3209 if (mdsc->fsc->mount_state == CEPH_MOUNT_SHUTDOWN)
3212 mutex_lock(&mdsc->mutex);
3213 for (i = 0; i < mdsc->max_sessions; i++)
3214 if (mdsc->sessions[i])
3216 mutex_unlock(&mdsc->mutex);
3221 * called after sb is ro.
3223 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3225 struct ceph_mds_session *session;
3227 struct ceph_fs_client *fsc = mdsc->fsc;
3228 unsigned long timeout = fsc->client->options->mount_timeout * HZ;
3230 dout("close_sessions\n");
3232 /* close sessions */
3233 mutex_lock(&mdsc->mutex);
3234 for (i = 0; i < mdsc->max_sessions; i++) {
3235 session = __ceph_lookup_mds_session(mdsc, i);
3238 mutex_unlock(&mdsc->mutex);
3239 mutex_lock(&session->s_mutex);
3240 __close_session(mdsc, session);
3241 mutex_unlock(&session->s_mutex);
3242 ceph_put_mds_session(session);
3243 mutex_lock(&mdsc->mutex);
3245 mutex_unlock(&mdsc->mutex);
3247 dout("waiting for sessions to close\n");
3248 wait_event_timeout(mdsc->session_close_wq, done_closing_sessions(mdsc),
3251 /* tear down remaining sessions */
3252 mutex_lock(&mdsc->mutex);
3253 for (i = 0; i < mdsc->max_sessions; i++) {
3254 if (mdsc->sessions[i]) {
3255 session = get_session(mdsc->sessions[i]);
3256 __unregister_session(mdsc, session);
3257 mutex_unlock(&mdsc->mutex);
3258 mutex_lock(&session->s_mutex);
3259 remove_session_caps(session);
3260 mutex_unlock(&session->s_mutex);
3261 ceph_put_mds_session(session);
3262 mutex_lock(&mdsc->mutex);
3265 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3266 mutex_unlock(&mdsc->mutex);
3268 ceph_cleanup_empty_realms(mdsc);
3270 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3275 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3278 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3280 ceph_mdsmap_destroy(mdsc->mdsmap);
3281 kfree(mdsc->sessions);
3282 ceph_caps_finalize(mdsc);
3285 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3287 struct ceph_mds_client *mdsc = fsc->mdsc;
3289 dout("mdsc_destroy %p\n", mdsc);
3290 ceph_mdsc_stop(mdsc);
3292 /* flush out any connection work with references to us */
3297 dout("mdsc_destroy %p done\n", mdsc);
3302 * handle mds map update.
3304 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3308 void *p = msg->front.iov_base;
3309 void *end = p + msg->front.iov_len;
3310 struct ceph_mdsmap *newmap, *oldmap;
3311 struct ceph_fsid fsid;
3314 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3315 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3316 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3318 epoch = ceph_decode_32(&p);
3319 maplen = ceph_decode_32(&p);
3320 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3322 /* do we need it? */
3323 ceph_monc_got_mdsmap(&mdsc->fsc->client->monc, epoch);
3324 mutex_lock(&mdsc->mutex);
3325 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3326 dout("handle_map epoch %u <= our %u\n",
3327 epoch, mdsc->mdsmap->m_epoch);
3328 mutex_unlock(&mdsc->mutex);
3332 newmap = ceph_mdsmap_decode(&p, end);
3333 if (IS_ERR(newmap)) {
3334 err = PTR_ERR(newmap);
3338 /* swap into place */
3340 oldmap = mdsc->mdsmap;
3341 mdsc->mdsmap = newmap;
3342 check_new_map(mdsc, newmap, oldmap);
3343 ceph_mdsmap_destroy(oldmap);
3345 mdsc->mdsmap = newmap; /* first mds map */
3347 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3349 __wake_requests(mdsc, &mdsc->waiting_for_map);
3351 mutex_unlock(&mdsc->mutex);
3352 schedule_delayed(mdsc);
3356 mutex_unlock(&mdsc->mutex);
3358 pr_err("error decoding mdsmap %d\n", err);
3362 static struct ceph_connection *con_get(struct ceph_connection *con)
3364 struct ceph_mds_session *s = con->private;
3366 if (get_session(s)) {
3367 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3370 dout("mdsc con_get %p FAIL\n", s);
3374 static void con_put(struct ceph_connection *con)
3376 struct ceph_mds_session *s = con->private;
3378 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3379 ceph_put_mds_session(s);
3383 * if the client is unresponsive for long enough, the mds will kill
3384 * the session entirely.
3386 static void peer_reset(struct ceph_connection *con)
3388 struct ceph_mds_session *s = con->private;
3389 struct ceph_mds_client *mdsc = s->s_mdsc;
3391 pr_warning("mds%d closed our session\n", s->s_mds);
3392 send_mds_reconnect(mdsc, s);
3395 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3397 struct ceph_mds_session *s = con->private;
3398 struct ceph_mds_client *mdsc = s->s_mdsc;
3399 int type = le16_to_cpu(msg->hdr.type);
3401 mutex_lock(&mdsc->mutex);
3402 if (__verify_registered_session(mdsc, s) < 0) {
3403 mutex_unlock(&mdsc->mutex);
3406 mutex_unlock(&mdsc->mutex);
3409 case CEPH_MSG_MDS_MAP:
3410 ceph_mdsc_handle_map(mdsc, msg);
3412 case CEPH_MSG_CLIENT_SESSION:
3413 handle_session(s, msg);
3415 case CEPH_MSG_CLIENT_REPLY:
3416 handle_reply(s, msg);
3418 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3419 handle_forward(mdsc, s, msg);
3421 case CEPH_MSG_CLIENT_CAPS:
3422 ceph_handle_caps(s, msg);
3424 case CEPH_MSG_CLIENT_SNAP:
3425 ceph_handle_snap(mdsc, s, msg);
3427 case CEPH_MSG_CLIENT_LEASE:
3428 handle_lease(mdsc, s, msg);
3432 pr_err("received unknown message type %d %s\n", type,
3433 ceph_msg_type_name(type));
3444 * Note: returned pointer is the address of a structure that's
3445 * managed separately. Caller must *not* attempt to free it.
3447 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3448 int *proto, int force_new)
3450 struct ceph_mds_session *s = con->private;
3451 struct ceph_mds_client *mdsc = s->s_mdsc;
3452 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3453 struct ceph_auth_handshake *auth = &s->s_auth;
3455 if (force_new && auth->authorizer) {
3456 ceph_auth_destroy_authorizer(ac, auth->authorizer);
3457 auth->authorizer = NULL;
3459 if (!auth->authorizer) {
3460 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3463 return ERR_PTR(ret);
3465 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3468 return ERR_PTR(ret);
3470 *proto = ac->protocol;
3476 static int verify_authorizer_reply(struct ceph_connection *con, int len)
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;
3482 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer, len);
3485 static int invalidate_authorizer(struct ceph_connection *con)
3487 struct ceph_mds_session *s = con->private;
3488 struct ceph_mds_client *mdsc = s->s_mdsc;
3489 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3491 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3493 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
3496 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
3497 struct ceph_msg_header *hdr, int *skip)
3499 struct ceph_msg *msg;
3500 int type = (int) le16_to_cpu(hdr->type);
3501 int front_len = (int) le32_to_cpu(hdr->front_len);
3507 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
3509 pr_err("unable to allocate msg type %d len %d\n",
3517 static const struct ceph_connection_operations mds_con_ops = {
3520 .dispatch = dispatch,
3521 .get_authorizer = get_authorizer,
3522 .verify_authorizer_reply = verify_authorizer_reply,
3523 .invalidate_authorizer = invalidate_authorizer,
3524 .peer_reset = peer_reset,
3525 .alloc_msg = mds_alloc_msg,