1 #include "ceph_debug.h"
3 #include <linux/wait.h>
4 #include <linux/slab.h>
5 #include <linux/sched.h>
7 #include "mds_client.h"
8 #include "mon_client.h"
10 #include "messenger.h"
16 * A cluster of MDS (metadata server) daemons is responsible for
17 * managing the file system namespace (the directory hierarchy and
18 * inodes) and for coordinating shared access to storage. Metadata is
19 * partitioning hierarchically across a number of servers, and that
20 * partition varies over time as the cluster adjusts the distribution
21 * in order to balance load.
23 * The MDS client is primarily responsible to managing synchronous
24 * metadata requests for operations like open, unlink, and so forth.
25 * If there is a MDS failure, we find out about it when we (possibly
26 * request and) receive a new MDS map, and can resubmit affected
29 * For the most part, though, we take advantage of a lossless
30 * communications channel to the MDS, and do not need to worry about
31 * timing out or resubmitting requests.
33 * We maintain a stateful "session" with each MDS we interact with.
34 * Within each session, we sent periodic heartbeat messages to ensure
35 * any capabilities or leases we have been issues remain valid. If
36 * the session times out and goes stale, our leases and capabilities
37 * are no longer valid.
40 static void __wake_requests(struct ceph_mds_client *mdsc,
41 struct list_head *head);
43 static const struct ceph_connection_operations mds_con_ops;
51 * parse individual inode info
53 static int parse_reply_info_in(void **p, void *end,
54 struct ceph_mds_reply_info_in *info)
59 *p += sizeof(struct ceph_mds_reply_inode) +
60 sizeof(*info->in->fragtree.splits) *
61 le32_to_cpu(info->in->fragtree.nsplits);
63 ceph_decode_32_safe(p, end, info->symlink_len, bad);
64 ceph_decode_need(p, end, info->symlink_len, bad);
66 *p += info->symlink_len;
68 ceph_decode_32_safe(p, end, info->xattr_len, bad);
69 ceph_decode_need(p, end, info->xattr_len, bad);
70 info->xattr_data = *p;
71 *p += info->xattr_len;
78 * parse a normal reply, which may contain a (dir+)dentry and/or a
81 static int parse_reply_info_trace(void **p, void *end,
82 struct ceph_mds_reply_info_parsed *info)
86 if (info->head->is_dentry) {
87 err = parse_reply_info_in(p, end, &info->diri);
91 if (unlikely(*p + sizeof(*info->dirfrag) > end))
94 *p += sizeof(*info->dirfrag) +
95 sizeof(u32)*le32_to_cpu(info->dirfrag->ndist);
96 if (unlikely(*p > end))
99 ceph_decode_32_safe(p, end, info->dname_len, bad);
100 ceph_decode_need(p, end, info->dname_len, bad);
102 *p += info->dname_len;
104 *p += sizeof(*info->dlease);
107 if (info->head->is_target) {
108 err = parse_reply_info_in(p, end, &info->targeti);
113 if (unlikely(*p != end))
120 pr_err("problem parsing mds trace %d\n", err);
125 * parse readdir results
127 static int parse_reply_info_dir(void **p, void *end,
128 struct ceph_mds_reply_info_parsed *info)
134 if (*p + sizeof(*info->dir_dir) > end)
136 *p += sizeof(*info->dir_dir) +
137 sizeof(u32)*le32_to_cpu(info->dir_dir->ndist);
141 ceph_decode_need(p, end, sizeof(num) + 2, bad);
142 num = ceph_decode_32(p);
143 info->dir_end = ceph_decode_8(p);
144 info->dir_complete = ceph_decode_8(p);
148 /* alloc large array */
150 info->dir_in = kcalloc(num, sizeof(*info->dir_in) +
151 sizeof(*info->dir_dname) +
152 sizeof(*info->dir_dname_len) +
153 sizeof(*info->dir_dlease),
155 if (info->dir_in == NULL) {
159 info->dir_dname = (void *)(info->dir_in + num);
160 info->dir_dname_len = (void *)(info->dir_dname + num);
161 info->dir_dlease = (void *)(info->dir_dname_len + num);
165 ceph_decode_need(p, end, sizeof(u32)*2, bad);
166 info->dir_dname_len[i] = ceph_decode_32(p);
167 ceph_decode_need(p, end, info->dir_dname_len[i], bad);
168 info->dir_dname[i] = *p;
169 *p += info->dir_dname_len[i];
170 dout("parsed dir dname '%.*s'\n", info->dir_dname_len[i],
172 info->dir_dlease[i] = *p;
173 *p += sizeof(struct ceph_mds_reply_lease);
176 err = parse_reply_info_in(p, end, &info->dir_in[i]);
191 pr_err("problem parsing dir contents %d\n", err);
196 * parse entire mds reply
198 static int parse_reply_info(struct ceph_msg *msg,
199 struct ceph_mds_reply_info_parsed *info)
205 info->head = msg->front.iov_base;
206 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
207 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
210 ceph_decode_32_safe(&p, end, len, bad);
212 err = parse_reply_info_trace(&p, p+len, info);
218 ceph_decode_32_safe(&p, end, len, bad);
220 err = parse_reply_info_dir(&p, p+len, info);
226 ceph_decode_32_safe(&p, end, len, bad);
227 info->snapblob_len = len;
238 pr_err("mds parse_reply err %d\n", err);
242 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
251 static const char *session_state_name(int s)
254 case CEPH_MDS_SESSION_NEW: return "new";
255 case CEPH_MDS_SESSION_OPENING: return "opening";
256 case CEPH_MDS_SESSION_OPEN: return "open";
257 case CEPH_MDS_SESSION_HUNG: return "hung";
258 case CEPH_MDS_SESSION_CLOSING: return "closing";
259 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
260 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
261 default: return "???";
265 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
267 if (atomic_inc_not_zero(&s->s_ref)) {
268 dout("mdsc get_session %p %d -> %d\n", s,
269 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
272 dout("mdsc get_session %p 0 -- FAIL", s);
277 void ceph_put_mds_session(struct ceph_mds_session *s)
279 dout("mdsc put_session %p %d -> %d\n", s,
280 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
281 if (atomic_dec_and_test(&s->s_ref)) {
283 s->s_mdsc->client->monc.auth->ops->destroy_authorizer(
284 s->s_mdsc->client->monc.auth, s->s_authorizer);
290 * called under mdsc->mutex
292 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
295 struct ceph_mds_session *session;
297 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
299 session = mdsc->sessions[mds];
300 dout("lookup_mds_session %p %d\n", session,
301 atomic_read(&session->s_ref));
302 get_session(session);
306 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
308 if (mds >= mdsc->max_sessions)
310 return mdsc->sessions[mds];
313 static int __verify_registered_session(struct ceph_mds_client *mdsc,
314 struct ceph_mds_session *s)
316 if (s->s_mds >= mdsc->max_sessions ||
317 mdsc->sessions[s->s_mds] != s)
323 * create+register a new session for given mds.
324 * called under mdsc->mutex.
326 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
329 struct ceph_mds_session *s;
331 s = kzalloc(sizeof(*s), GFP_NOFS);
333 return ERR_PTR(-ENOMEM);
336 s->s_state = CEPH_MDS_SESSION_NEW;
339 mutex_init(&s->s_mutex);
341 ceph_con_init(mdsc->client->msgr, &s->s_con);
342 s->s_con.private = s;
343 s->s_con.ops = &mds_con_ops;
344 s->s_con.peer_name.type = CEPH_ENTITY_TYPE_MDS;
345 s->s_con.peer_name.num = cpu_to_le64(mds);
347 spin_lock_init(&s->s_cap_lock);
350 s->s_renew_requested = 0;
352 INIT_LIST_HEAD(&s->s_caps);
355 atomic_set(&s->s_ref, 1);
356 INIT_LIST_HEAD(&s->s_waiting);
357 INIT_LIST_HEAD(&s->s_unsafe);
358 s->s_num_cap_releases = 0;
359 s->s_cap_iterator = NULL;
360 INIT_LIST_HEAD(&s->s_cap_releases);
361 INIT_LIST_HEAD(&s->s_cap_releases_done);
362 INIT_LIST_HEAD(&s->s_cap_flushing);
363 INIT_LIST_HEAD(&s->s_cap_snaps_flushing);
365 dout("register_session mds%d\n", mds);
366 if (mds >= mdsc->max_sessions) {
367 int newmax = 1 << get_count_order(mds+1);
368 struct ceph_mds_session **sa;
370 dout("register_session realloc to %d\n", newmax);
371 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
374 if (mdsc->sessions) {
375 memcpy(sa, mdsc->sessions,
376 mdsc->max_sessions * sizeof(void *));
377 kfree(mdsc->sessions);
380 mdsc->max_sessions = newmax;
382 mdsc->sessions[mds] = s;
383 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
385 ceph_con_open(&s->s_con, ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
391 return ERR_PTR(-ENOMEM);
395 * called under mdsc->mutex
397 static void __unregister_session(struct ceph_mds_client *mdsc,
398 struct ceph_mds_session *s)
400 dout("__unregister_session mds%d %p\n", s->s_mds, s);
401 BUG_ON(mdsc->sessions[s->s_mds] != s);
402 mdsc->sessions[s->s_mds] = NULL;
403 ceph_con_close(&s->s_con);
404 ceph_put_mds_session(s);
408 * drop session refs in request.
410 * should be last request ref, or hold mdsc->mutex
412 static void put_request_session(struct ceph_mds_request *req)
414 if (req->r_session) {
415 ceph_put_mds_session(req->r_session);
416 req->r_session = NULL;
420 void ceph_mdsc_release_request(struct kref *kref)
422 struct ceph_mds_request *req = container_of(kref,
423 struct ceph_mds_request,
426 ceph_msg_put(req->r_request);
428 ceph_msg_put(req->r_reply);
429 destroy_reply_info(&req->r_reply_info);
432 ceph_put_cap_refs(ceph_inode(req->r_inode),
436 if (req->r_locked_dir)
437 ceph_put_cap_refs(ceph_inode(req->r_locked_dir),
439 if (req->r_target_inode)
440 iput(req->r_target_inode);
443 if (req->r_old_dentry) {
445 ceph_inode(req->r_old_dentry->d_parent->d_inode),
447 dput(req->r_old_dentry);
451 put_request_session(req);
452 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
457 * lookup session, bump ref if found.
459 * called under mdsc->mutex.
461 static struct ceph_mds_request *__lookup_request(struct ceph_mds_client *mdsc,
464 struct ceph_mds_request *req;
465 struct rb_node *n = mdsc->request_tree.rb_node;
468 req = rb_entry(n, struct ceph_mds_request, r_node);
469 if (tid < req->r_tid)
471 else if (tid > req->r_tid)
474 ceph_mdsc_get_request(req);
481 static void __insert_request(struct ceph_mds_client *mdsc,
482 struct ceph_mds_request *new)
484 struct rb_node **p = &mdsc->request_tree.rb_node;
485 struct rb_node *parent = NULL;
486 struct ceph_mds_request *req = NULL;
490 req = rb_entry(parent, struct ceph_mds_request, r_node);
491 if (new->r_tid < req->r_tid)
493 else if (new->r_tid > req->r_tid)
499 rb_link_node(&new->r_node, parent, p);
500 rb_insert_color(&new->r_node, &mdsc->request_tree);
504 * Register an in-flight request, and assign a tid. Link to directory
505 * are modifying (if any).
507 * Called under mdsc->mutex.
509 static void __register_request(struct ceph_mds_client *mdsc,
510 struct ceph_mds_request *req,
513 req->r_tid = ++mdsc->last_tid;
515 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
517 dout("__register_request %p tid %lld\n", req, req->r_tid);
518 ceph_mdsc_get_request(req);
519 __insert_request(mdsc, req);
522 struct ceph_inode_info *ci = ceph_inode(dir);
524 spin_lock(&ci->i_unsafe_lock);
525 req->r_unsafe_dir = dir;
526 list_add_tail(&req->r_unsafe_dir_item, &ci->i_unsafe_dirops);
527 spin_unlock(&ci->i_unsafe_lock);
531 static void __unregister_request(struct ceph_mds_client *mdsc,
532 struct ceph_mds_request *req)
534 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
535 rb_erase(&req->r_node, &mdsc->request_tree);
536 RB_CLEAR_NODE(&req->r_node);
538 if (req->r_unsafe_dir) {
539 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
541 spin_lock(&ci->i_unsafe_lock);
542 list_del_init(&req->r_unsafe_dir_item);
543 spin_unlock(&ci->i_unsafe_lock);
546 ceph_mdsc_put_request(req);
550 * Choose mds to send request to next. If there is a hint set in the
551 * request (e.g., due to a prior forward hint from the mds), use that.
552 * Otherwise, consult frag tree and/or caps to identify the
553 * appropriate mds. If all else fails, choose randomly.
555 * Called under mdsc->mutex.
557 static int __choose_mds(struct ceph_mds_client *mdsc,
558 struct ceph_mds_request *req)
561 struct ceph_inode_info *ci;
562 struct ceph_cap *cap;
563 int mode = req->r_direct_mode;
565 u32 hash = req->r_direct_hash;
566 bool is_hash = req->r_direct_is_hash;
569 * is there a specific mds we should try? ignore hint if we have
570 * no session and the mds is not up (active or recovering).
572 if (req->r_resend_mds >= 0 &&
573 (__have_session(mdsc, req->r_resend_mds) ||
574 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
575 dout("choose_mds using resend_mds mds%d\n",
577 return req->r_resend_mds;
580 if (mode == USE_RANDOM_MDS)
585 inode = req->r_inode;
586 } else if (req->r_dentry) {
587 if (req->r_dentry->d_inode) {
588 inode = req->r_dentry->d_inode;
590 inode = req->r_dentry->d_parent->d_inode;
591 hash = req->r_dentry->d_name.hash;
595 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
599 ci = ceph_inode(inode);
601 if (is_hash && S_ISDIR(inode->i_mode)) {
602 struct ceph_inode_frag frag;
605 ceph_choose_frag(ci, hash, &frag, &found);
607 if (mode == USE_ANY_MDS && frag.ndist > 0) {
610 /* choose a random replica */
611 get_random_bytes(&r, 1);
614 dout("choose_mds %p %llx.%llx "
615 "frag %u mds%d (%d/%d)\n",
616 inode, ceph_vinop(inode),
622 /* since this file/dir wasn't known to be
623 * replicated, then we want to look for the
624 * authoritative mds. */
627 /* choose auth mds */
629 dout("choose_mds %p %llx.%llx "
630 "frag %u mds%d (auth)\n",
631 inode, ceph_vinop(inode), frag.frag, mds);
637 spin_lock(&inode->i_lock);
639 if (mode == USE_AUTH_MDS)
640 cap = ci->i_auth_cap;
641 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
642 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
644 spin_unlock(&inode->i_lock);
647 mds = cap->session->s_mds;
648 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
649 inode, ceph_vinop(inode), mds,
650 cap == ci->i_auth_cap ? "auth " : "", cap);
651 spin_unlock(&inode->i_lock);
655 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
656 dout("choose_mds chose random mds%d\n", mds);
664 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
666 struct ceph_msg *msg;
667 struct ceph_mds_session_head *h;
669 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS);
671 pr_err("create_session_msg ENOMEM creating msg\n");
674 h = msg->front.iov_base;
675 h->op = cpu_to_le32(op);
676 h->seq = cpu_to_le64(seq);
681 * send session open request.
683 * called under mdsc->mutex
685 static int __open_session(struct ceph_mds_client *mdsc,
686 struct ceph_mds_session *session)
688 struct ceph_msg *msg;
690 int mds = session->s_mds;
692 /* wait for mds to go active? */
693 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
694 dout("open_session to mds%d (%s)\n", mds,
695 ceph_mds_state_name(mstate));
696 session->s_state = CEPH_MDS_SESSION_OPENING;
697 session->s_renew_requested = jiffies;
699 /* send connect message */
700 msg = create_session_msg(CEPH_SESSION_REQUEST_OPEN, session->s_seq);
703 ceph_con_send(&session->s_con, msg);
712 * Free preallocated cap messages assigned to this session
714 static void cleanup_cap_releases(struct ceph_mds_session *session)
716 struct ceph_msg *msg;
718 spin_lock(&session->s_cap_lock);
719 while (!list_empty(&session->s_cap_releases)) {
720 msg = list_first_entry(&session->s_cap_releases,
721 struct ceph_msg, list_head);
722 list_del_init(&msg->list_head);
725 while (!list_empty(&session->s_cap_releases_done)) {
726 msg = list_first_entry(&session->s_cap_releases_done,
727 struct ceph_msg, list_head);
728 list_del_init(&msg->list_head);
731 spin_unlock(&session->s_cap_lock);
735 * Helper to safely iterate over all caps associated with a session, with
736 * special care taken to handle a racing __ceph_remove_cap().
738 * Caller must hold session s_mutex.
740 static int iterate_session_caps(struct ceph_mds_session *session,
741 int (*cb)(struct inode *, struct ceph_cap *,
745 struct ceph_cap *cap;
746 struct inode *inode, *last_inode = NULL;
747 struct ceph_cap *old_cap = NULL;
750 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
751 spin_lock(&session->s_cap_lock);
752 p = session->s_caps.next;
753 while (p != &session->s_caps) {
754 cap = list_entry(p, struct ceph_cap, session_caps);
755 inode = igrab(&cap->ci->vfs_inode);
760 session->s_cap_iterator = cap;
761 spin_unlock(&session->s_cap_lock);
768 ceph_put_cap(session->s_mdsc, old_cap);
772 ret = cb(inode, cap, arg);
775 spin_lock(&session->s_cap_lock);
777 if (cap->ci == NULL) {
778 dout("iterate_session_caps finishing cap %p removal\n",
780 BUG_ON(cap->session != session);
781 list_del_init(&cap->session_caps);
782 session->s_nr_caps--;
784 old_cap = cap; /* put_cap it w/o locks held */
791 session->s_cap_iterator = NULL;
792 spin_unlock(&session->s_cap_lock);
797 ceph_put_cap(session->s_mdsc, old_cap);
802 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
805 struct ceph_inode_info *ci = ceph_inode(inode);
808 dout("removing cap %p, ci is %p, inode is %p\n",
809 cap, ci, &ci->vfs_inode);
810 spin_lock(&inode->i_lock);
811 __ceph_remove_cap(cap);
812 if (!__ceph_is_any_real_caps(ci)) {
813 struct ceph_mds_client *mdsc =
814 &ceph_sb_to_client(inode->i_sb)->mdsc;
816 spin_lock(&mdsc->cap_dirty_lock);
817 if (!list_empty(&ci->i_dirty_item)) {
818 pr_info(" dropping dirty %s state for %p %lld\n",
819 ceph_cap_string(ci->i_dirty_caps),
820 inode, ceph_ino(inode));
821 ci->i_dirty_caps = 0;
822 list_del_init(&ci->i_dirty_item);
825 if (!list_empty(&ci->i_flushing_item)) {
826 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
827 ceph_cap_string(ci->i_flushing_caps),
828 inode, ceph_ino(inode));
829 ci->i_flushing_caps = 0;
830 list_del_init(&ci->i_flushing_item);
831 mdsc->num_cap_flushing--;
834 if (drop && ci->i_wrbuffer_ref) {
835 pr_info(" dropping dirty data for %p %lld\n",
836 inode, ceph_ino(inode));
837 ci->i_wrbuffer_ref = 0;
838 ci->i_wrbuffer_ref_head = 0;
841 spin_unlock(&mdsc->cap_dirty_lock);
843 spin_unlock(&inode->i_lock);
850 * caller must hold session s_mutex
852 static void remove_session_caps(struct ceph_mds_session *session)
854 dout("remove_session_caps on %p\n", session);
855 iterate_session_caps(session, remove_session_caps_cb, NULL);
856 BUG_ON(session->s_nr_caps > 0);
857 BUG_ON(!list_empty(&session->s_cap_flushing));
858 cleanup_cap_releases(session);
862 * wake up any threads waiting on this session's caps. if the cap is
863 * old (didn't get renewed on the client reconnect), remove it now.
865 * caller must hold s_mutex.
867 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
870 struct ceph_inode_info *ci = ceph_inode(inode);
872 wake_up_all(&ci->i_cap_wq);
874 spin_lock(&inode->i_lock);
875 ci->i_wanted_max_size = 0;
876 ci->i_requested_max_size = 0;
877 spin_unlock(&inode->i_lock);
882 static void wake_up_session_caps(struct ceph_mds_session *session,
885 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
886 iterate_session_caps(session, wake_up_session_cb,
887 (void *)(unsigned long)reconnect);
891 * Send periodic message to MDS renewing all currently held caps. The
892 * ack will reset the expiration for all caps from this session.
894 * caller holds s_mutex
896 static int send_renew_caps(struct ceph_mds_client *mdsc,
897 struct ceph_mds_session *session)
899 struct ceph_msg *msg;
902 if (time_after_eq(jiffies, session->s_cap_ttl) &&
903 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
904 pr_info("mds%d caps stale\n", session->s_mds);
905 session->s_renew_requested = jiffies;
907 /* do not try to renew caps until a recovering mds has reconnected
908 * with its clients. */
909 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
910 if (state < CEPH_MDS_STATE_RECONNECT) {
911 dout("send_renew_caps ignoring mds%d (%s)\n",
912 session->s_mds, ceph_mds_state_name(state));
916 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
917 ceph_mds_state_name(state));
918 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
919 ++session->s_renew_seq);
922 ceph_con_send(&session->s_con, msg);
927 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
929 * Called under session->s_mutex
931 static void renewed_caps(struct ceph_mds_client *mdsc,
932 struct ceph_mds_session *session, int is_renew)
937 spin_lock(&session->s_cap_lock);
938 was_stale = is_renew && (session->s_cap_ttl == 0 ||
939 time_after_eq(jiffies, session->s_cap_ttl));
941 session->s_cap_ttl = session->s_renew_requested +
942 mdsc->mdsmap->m_session_timeout*HZ;
945 if (time_before(jiffies, session->s_cap_ttl)) {
946 pr_info("mds%d caps renewed\n", session->s_mds);
949 pr_info("mds%d caps still stale\n", session->s_mds);
952 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
953 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
954 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
955 spin_unlock(&session->s_cap_lock);
958 wake_up_session_caps(session, 0);
962 * send a session close request
964 static int request_close_session(struct ceph_mds_client *mdsc,
965 struct ceph_mds_session *session)
967 struct ceph_msg *msg;
969 dout("request_close_session mds%d state %s seq %lld\n",
970 session->s_mds, session_state_name(session->s_state),
972 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
975 ceph_con_send(&session->s_con, msg);
980 * Called with s_mutex held.
982 static int __close_session(struct ceph_mds_client *mdsc,
983 struct ceph_mds_session *session)
985 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
987 session->s_state = CEPH_MDS_SESSION_CLOSING;
988 return request_close_session(mdsc, session);
994 * Because we can't cache an inode without one or more caps, we do
995 * this indirectly: if a cap is unused, we prune its aliases, at which
996 * point the inode will hopefully get dropped to.
998 * Yes, this is a bit sloppy. Our only real goal here is to respond to
999 * memory pressure from the MDS, though, so it needn't be perfect.
1001 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1003 struct ceph_mds_session *session = arg;
1004 struct ceph_inode_info *ci = ceph_inode(inode);
1005 int used, oissued, mine;
1007 if (session->s_trim_caps <= 0)
1010 spin_lock(&inode->i_lock);
1011 mine = cap->issued | cap->implemented;
1012 used = __ceph_caps_used(ci);
1013 oissued = __ceph_caps_issued_other(ci, cap);
1015 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1016 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1017 ceph_cap_string(used));
1018 if (ci->i_dirty_caps)
1019 goto out; /* dirty caps */
1020 if ((used & ~oissued) & mine)
1021 goto out; /* we need these caps */
1023 session->s_trim_caps--;
1025 /* we aren't the only cap.. just remove us */
1026 __ceph_remove_cap(cap);
1028 /* try to drop referring dentries */
1029 spin_unlock(&inode->i_lock);
1030 d_prune_aliases(inode);
1031 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1032 inode, cap, atomic_read(&inode->i_count));
1037 spin_unlock(&inode->i_lock);
1042 * Trim session cap count down to some max number.
1044 static int trim_caps(struct ceph_mds_client *mdsc,
1045 struct ceph_mds_session *session,
1048 int trim_caps = session->s_nr_caps - max_caps;
1050 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1051 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1052 if (trim_caps > 0) {
1053 session->s_trim_caps = trim_caps;
1054 iterate_session_caps(session, trim_caps_cb, session);
1055 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1056 session->s_mds, session->s_nr_caps, max_caps,
1057 trim_caps - session->s_trim_caps);
1058 session->s_trim_caps = 0;
1064 * Allocate cap_release messages. If there is a partially full message
1065 * in the queue, try to allocate enough to cover it's remainder, so that
1066 * we can send it immediately.
1068 * Called under s_mutex.
1070 int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
1071 struct ceph_mds_session *session)
1073 struct ceph_msg *msg, *partial = NULL;
1074 struct ceph_mds_cap_release *head;
1076 int extra = mdsc->client->mount_args->cap_release_safety;
1079 dout("add_cap_releases %p mds%d extra %d\n", session, session->s_mds,
1082 spin_lock(&session->s_cap_lock);
1084 if (!list_empty(&session->s_cap_releases)) {
1085 msg = list_first_entry(&session->s_cap_releases,
1088 head = msg->front.iov_base;
1089 num = le32_to_cpu(head->num);
1091 dout(" partial %p with (%d/%d)\n", msg, num,
1092 (int)CEPH_CAPS_PER_RELEASE);
1093 extra += CEPH_CAPS_PER_RELEASE - num;
1097 while (session->s_num_cap_releases < session->s_nr_caps + extra) {
1098 spin_unlock(&session->s_cap_lock);
1099 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE, PAGE_CACHE_SIZE,
1103 dout("add_cap_releases %p msg %p now %d\n", session, msg,
1104 (int)msg->front.iov_len);
1105 head = msg->front.iov_base;
1106 head->num = cpu_to_le32(0);
1107 msg->front.iov_len = sizeof(*head);
1108 spin_lock(&session->s_cap_lock);
1109 list_add(&msg->list_head, &session->s_cap_releases);
1110 session->s_num_cap_releases += CEPH_CAPS_PER_RELEASE;
1114 head = partial->front.iov_base;
1115 num = le32_to_cpu(head->num);
1116 dout(" queueing partial %p with %d/%d\n", partial, num,
1117 (int)CEPH_CAPS_PER_RELEASE);
1118 list_move_tail(&partial->list_head,
1119 &session->s_cap_releases_done);
1120 session->s_num_cap_releases -= CEPH_CAPS_PER_RELEASE - num;
1123 spin_unlock(&session->s_cap_lock);
1129 * flush all dirty inode data to disk.
1131 * returns true if we've flushed through want_flush_seq
1133 static int check_cap_flush(struct ceph_mds_client *mdsc, u64 want_flush_seq)
1137 dout("check_cap_flush want %lld\n", want_flush_seq);
1138 mutex_lock(&mdsc->mutex);
1139 for (mds = 0; ret && mds < mdsc->max_sessions; mds++) {
1140 struct ceph_mds_session *session = mdsc->sessions[mds];
1144 get_session(session);
1145 mutex_unlock(&mdsc->mutex);
1147 mutex_lock(&session->s_mutex);
1148 if (!list_empty(&session->s_cap_flushing)) {
1149 struct ceph_inode_info *ci =
1150 list_entry(session->s_cap_flushing.next,
1151 struct ceph_inode_info,
1153 struct inode *inode = &ci->vfs_inode;
1155 spin_lock(&inode->i_lock);
1156 if (ci->i_cap_flush_seq <= want_flush_seq) {
1157 dout("check_cap_flush still flushing %p "
1158 "seq %lld <= %lld to mds%d\n", inode,
1159 ci->i_cap_flush_seq, want_flush_seq,
1163 spin_unlock(&inode->i_lock);
1165 mutex_unlock(&session->s_mutex);
1166 ceph_put_mds_session(session);
1170 mutex_lock(&mdsc->mutex);
1173 mutex_unlock(&mdsc->mutex);
1174 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq);
1179 * called under s_mutex
1181 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1182 struct ceph_mds_session *session)
1184 struct ceph_msg *msg;
1186 dout("send_cap_releases mds%d\n", session->s_mds);
1187 spin_lock(&session->s_cap_lock);
1188 while (!list_empty(&session->s_cap_releases_done)) {
1189 msg = list_first_entry(&session->s_cap_releases_done,
1190 struct ceph_msg, list_head);
1191 list_del_init(&msg->list_head);
1192 spin_unlock(&session->s_cap_lock);
1193 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1194 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1195 ceph_con_send(&session->s_con, msg);
1196 spin_lock(&session->s_cap_lock);
1198 spin_unlock(&session->s_cap_lock);
1201 static void discard_cap_releases(struct ceph_mds_client *mdsc,
1202 struct ceph_mds_session *session)
1204 struct ceph_msg *msg;
1205 struct ceph_mds_cap_release *head;
1208 dout("discard_cap_releases mds%d\n", session->s_mds);
1209 spin_lock(&session->s_cap_lock);
1211 /* zero out the in-progress message */
1212 msg = list_first_entry(&session->s_cap_releases,
1213 struct ceph_msg, list_head);
1214 head = msg->front.iov_base;
1215 num = le32_to_cpu(head->num);
1216 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg, num);
1217 head->num = cpu_to_le32(0);
1218 session->s_num_cap_releases += num;
1220 /* requeue completed messages */
1221 while (!list_empty(&session->s_cap_releases_done)) {
1222 msg = list_first_entry(&session->s_cap_releases_done,
1223 struct ceph_msg, list_head);
1224 list_del_init(&msg->list_head);
1226 head = msg->front.iov_base;
1227 num = le32_to_cpu(head->num);
1228 dout("discard_cap_releases mds%d %p %u\n", session->s_mds, msg,
1230 session->s_num_cap_releases += num;
1231 head->num = cpu_to_le32(0);
1232 msg->front.iov_len = sizeof(*head);
1233 list_add(&msg->list_head, &session->s_cap_releases);
1236 spin_unlock(&session->s_cap_lock);
1244 * Create an mds request.
1246 struct ceph_mds_request *
1247 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1249 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1252 return ERR_PTR(-ENOMEM);
1254 mutex_init(&req->r_fill_mutex);
1256 req->r_started = jiffies;
1257 req->r_resend_mds = -1;
1258 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1260 kref_init(&req->r_kref);
1261 INIT_LIST_HEAD(&req->r_wait);
1262 init_completion(&req->r_completion);
1263 init_completion(&req->r_safe_completion);
1264 INIT_LIST_HEAD(&req->r_unsafe_item);
1267 req->r_direct_mode = mode;
1272 * return oldest (lowest) request, tid in request tree, 0 if none.
1274 * called under mdsc->mutex.
1276 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1278 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1280 return rb_entry(rb_first(&mdsc->request_tree),
1281 struct ceph_mds_request, r_node);
1284 static u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1286 struct ceph_mds_request *req = __get_oldest_req(mdsc);
1294 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1295 * on build_path_from_dentry in fs/cifs/dir.c.
1297 * If @stop_on_nosnap, generate path relative to the first non-snapped
1300 * Encode hidden .snap dirs as a double /, i.e.
1301 * foo/.snap/bar -> foo//bar
1303 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1306 struct dentry *temp;
1311 return ERR_PTR(-EINVAL);
1315 for (temp = dentry; !IS_ROOT(temp);) {
1316 struct inode *inode = temp->d_inode;
1317 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1318 len++; /* slash only */
1319 else if (stop_on_nosnap && inode &&
1320 ceph_snap(inode) == CEPH_NOSNAP)
1323 len += 1 + temp->d_name.len;
1324 temp = temp->d_parent;
1326 pr_err("build_path corrupt dentry %p\n", dentry);
1327 return ERR_PTR(-EINVAL);
1331 len--; /* no leading '/' */
1333 path = kmalloc(len+1, GFP_NOFS);
1335 return ERR_PTR(-ENOMEM);
1337 path[pos] = 0; /* trailing null */
1338 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1339 struct inode *inode = temp->d_inode;
1341 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1342 dout("build_path path+%d: %p SNAPDIR\n",
1344 } else if (stop_on_nosnap && inode &&
1345 ceph_snap(inode) == CEPH_NOSNAP) {
1348 pos -= temp->d_name.len;
1351 strncpy(path + pos, temp->d_name.name,
1356 temp = temp->d_parent;
1358 pr_err("build_path corrupt dentry\n");
1360 return ERR_PTR(-EINVAL);
1364 pr_err("build_path did not end path lookup where "
1365 "expected, namelen is %d, pos is %d\n", len, pos);
1366 /* presumably this is only possible if racing with a
1367 rename of one of the parent directories (we can not
1368 lock the dentries above us to prevent this, but
1369 retrying should be harmless) */
1374 *base = ceph_ino(temp->d_inode);
1376 dout("build_path on %p %d built %llx '%.*s'\n",
1377 dentry, atomic_read(&dentry->d_count), *base, len, path);
1381 static int build_dentry_path(struct dentry *dentry,
1382 const char **ppath, int *ppathlen, u64 *pino,
1387 if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP) {
1388 *pino = ceph_ino(dentry->d_parent->d_inode);
1389 *ppath = dentry->d_name.name;
1390 *ppathlen = dentry->d_name.len;
1393 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1395 return PTR_ERR(path);
1401 static int build_inode_path(struct inode *inode,
1402 const char **ppath, int *ppathlen, u64 *pino,
1405 struct dentry *dentry;
1408 if (ceph_snap(inode) == CEPH_NOSNAP) {
1409 *pino = ceph_ino(inode);
1413 dentry = d_find_alias(inode);
1414 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1417 return PTR_ERR(path);
1424 * request arguments may be specified via an inode *, a dentry *, or
1425 * an explicit ino+path.
1427 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1428 const char *rpath, u64 rino,
1429 const char **ppath, int *pathlen,
1430 u64 *ino, int *freepath)
1435 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1436 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1438 } else if (rdentry) {
1439 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1440 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1445 *pathlen = strlen(rpath);
1446 dout(" path %.*s\n", *pathlen, rpath);
1453 * called under mdsc->mutex
1455 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1456 struct ceph_mds_request *req,
1459 struct ceph_msg *msg;
1460 struct ceph_mds_request_head *head;
1461 const char *path1 = NULL;
1462 const char *path2 = NULL;
1463 u64 ino1 = 0, ino2 = 0;
1464 int pathlen1 = 0, pathlen2 = 0;
1465 int freepath1 = 0, freepath2 = 0;
1471 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1472 req->r_path1, req->r_ino1.ino,
1473 &path1, &pathlen1, &ino1, &freepath1);
1479 ret = set_request_path_attr(NULL, req->r_old_dentry,
1480 req->r_path2, req->r_ino2.ino,
1481 &path2, &pathlen2, &ino2, &freepath2);
1487 len = sizeof(*head) +
1488 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64));
1490 /* calculate (max) length for cap releases */
1491 len += sizeof(struct ceph_mds_request_release) *
1492 (!!req->r_inode_drop + !!req->r_dentry_drop +
1493 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1494 if (req->r_dentry_drop)
1495 len += req->r_dentry->d_name.len;
1496 if (req->r_old_dentry_drop)
1497 len += req->r_old_dentry->d_name.len;
1499 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS);
1501 msg = ERR_PTR(-ENOMEM);
1505 msg->hdr.tid = cpu_to_le64(req->r_tid);
1507 head = msg->front.iov_base;
1508 p = msg->front.iov_base + sizeof(*head);
1509 end = msg->front.iov_base + msg->front.iov_len;
1511 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1512 head->op = cpu_to_le32(req->r_op);
1513 head->caller_uid = cpu_to_le32(current_fsuid());
1514 head->caller_gid = cpu_to_le32(current_fsgid());
1515 head->args = req->r_args;
1517 ceph_encode_filepath(&p, end, ino1, path1);
1518 ceph_encode_filepath(&p, end, ino2, path2);
1520 /* make note of release offset, in case we need to replay */
1521 req->r_request_release_offset = p - msg->front.iov_base;
1525 if (req->r_inode_drop)
1526 releases += ceph_encode_inode_release(&p,
1527 req->r_inode ? req->r_inode : req->r_dentry->d_inode,
1528 mds, req->r_inode_drop, req->r_inode_unless, 0);
1529 if (req->r_dentry_drop)
1530 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1531 mds, req->r_dentry_drop, req->r_dentry_unless);
1532 if (req->r_old_dentry_drop)
1533 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1534 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1535 if (req->r_old_inode_drop)
1536 releases += ceph_encode_inode_release(&p,
1537 req->r_old_dentry->d_inode,
1538 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1539 head->num_releases = cpu_to_le16(releases);
1542 msg->front.iov_len = p - msg->front.iov_base;
1543 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1545 msg->pages = req->r_pages;
1546 msg->nr_pages = req->r_num_pages;
1547 msg->hdr.data_len = cpu_to_le32(req->r_data_len);
1548 msg->hdr.data_off = cpu_to_le16(0);
1552 kfree((char *)path2);
1555 kfree((char *)path1);
1561 * called under mdsc->mutex if error, under no mutex if
1564 static void complete_request(struct ceph_mds_client *mdsc,
1565 struct ceph_mds_request *req)
1567 if (req->r_callback)
1568 req->r_callback(mdsc, req);
1570 complete_all(&req->r_completion);
1574 * called under mdsc->mutex
1576 static int __prepare_send_request(struct ceph_mds_client *mdsc,
1577 struct ceph_mds_request *req,
1580 struct ceph_mds_request_head *rhead;
1581 struct ceph_msg *msg;
1586 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
1587 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
1589 if (req->r_got_unsafe) {
1591 * Replay. Do not regenerate message (and rebuild
1592 * paths, etc.); just use the original message.
1593 * Rebuilding paths will break for renames because
1594 * d_move mangles the src name.
1596 msg = req->r_request;
1597 rhead = msg->front.iov_base;
1599 flags = le32_to_cpu(rhead->flags);
1600 flags |= CEPH_MDS_FLAG_REPLAY;
1601 rhead->flags = cpu_to_le32(flags);
1603 if (req->r_target_inode)
1604 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
1606 rhead->num_retry = req->r_attempts - 1;
1608 /* remove cap/dentry releases from message */
1609 rhead->num_releases = 0;
1610 msg->hdr.front_len = cpu_to_le32(req->r_request_release_offset);
1611 msg->front.iov_len = req->r_request_release_offset;
1615 if (req->r_request) {
1616 ceph_msg_put(req->r_request);
1617 req->r_request = NULL;
1619 msg = create_request_message(mdsc, req, mds);
1621 req->r_err = PTR_ERR(msg);
1622 complete_request(mdsc, req);
1623 return PTR_ERR(msg);
1625 req->r_request = msg;
1627 rhead = msg->front.iov_base;
1628 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
1629 if (req->r_got_unsafe)
1630 flags |= CEPH_MDS_FLAG_REPLAY;
1631 if (req->r_locked_dir)
1632 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
1633 rhead->flags = cpu_to_le32(flags);
1634 rhead->num_fwd = req->r_num_fwd;
1635 rhead->num_retry = req->r_attempts - 1;
1638 dout(" r_locked_dir = %p\n", req->r_locked_dir);
1643 * send request, or put it on the appropriate wait list.
1645 static int __do_request(struct ceph_mds_client *mdsc,
1646 struct ceph_mds_request *req)
1648 struct ceph_mds_session *session = NULL;
1652 if (req->r_err || req->r_got_result)
1655 if (req->r_timeout &&
1656 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
1657 dout("do_request timed out\n");
1662 mds = __choose_mds(mdsc, req);
1664 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
1665 dout("do_request no mds or not active, waiting for map\n");
1666 list_add(&req->r_wait, &mdsc->waiting_for_map);
1670 /* get, open session */
1671 session = __ceph_lookup_mds_session(mdsc, mds);
1673 session = register_session(mdsc, mds);
1674 if (IS_ERR(session)) {
1675 err = PTR_ERR(session);
1679 dout("do_request mds%d session %p state %s\n", mds, session,
1680 session_state_name(session->s_state));
1681 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
1682 session->s_state != CEPH_MDS_SESSION_HUNG) {
1683 if (session->s_state == CEPH_MDS_SESSION_NEW ||
1684 session->s_state == CEPH_MDS_SESSION_CLOSING)
1685 __open_session(mdsc, session);
1686 list_add(&req->r_wait, &session->s_waiting);
1691 req->r_session = get_session(session);
1692 req->r_resend_mds = -1; /* forget any previous mds hint */
1694 if (req->r_request_started == 0) /* note request start time */
1695 req->r_request_started = jiffies;
1697 err = __prepare_send_request(mdsc, req, mds);
1699 ceph_msg_get(req->r_request);
1700 ceph_con_send(&session->s_con, req->r_request);
1704 ceph_put_mds_session(session);
1710 complete_request(mdsc, req);
1715 * called under mdsc->mutex
1717 static void __wake_requests(struct ceph_mds_client *mdsc,
1718 struct list_head *head)
1720 struct ceph_mds_request *req, *nreq;
1722 list_for_each_entry_safe(req, nreq, head, r_wait) {
1723 list_del_init(&req->r_wait);
1724 __do_request(mdsc, req);
1729 * Wake up threads with requests pending for @mds, so that they can
1730 * resubmit their requests to a possibly different mds.
1732 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
1734 struct ceph_mds_request *req;
1737 dout("kick_requests mds%d\n", mds);
1738 for (p = rb_first(&mdsc->request_tree); p; p = rb_next(p)) {
1739 req = rb_entry(p, struct ceph_mds_request, r_node);
1740 if (req->r_got_unsafe)
1742 if (req->r_session &&
1743 req->r_session->s_mds == mds) {
1744 dout(" kicking tid %llu\n", req->r_tid);
1745 put_request_session(req);
1746 __do_request(mdsc, req);
1751 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
1752 struct ceph_mds_request *req)
1754 dout("submit_request on %p\n", req);
1755 mutex_lock(&mdsc->mutex);
1756 __register_request(mdsc, req, NULL);
1757 __do_request(mdsc, req);
1758 mutex_unlock(&mdsc->mutex);
1762 * Synchrously perform an mds request. Take care of all of the
1763 * session setup, forwarding, retry details.
1765 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
1767 struct ceph_mds_request *req)
1771 dout("do_request on %p\n", req);
1773 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1775 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
1776 if (req->r_locked_dir)
1777 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
1778 if (req->r_old_dentry)
1780 ceph_inode(req->r_old_dentry->d_parent->d_inode),
1784 mutex_lock(&mdsc->mutex);
1785 __register_request(mdsc, req, dir);
1786 __do_request(mdsc, req);
1790 __unregister_request(mdsc, req);
1791 dout("do_request early error %d\n", err);
1796 mutex_unlock(&mdsc->mutex);
1797 dout("do_request waiting\n");
1798 if (req->r_timeout) {
1799 err = (long)wait_for_completion_killable_timeout(
1800 &req->r_completion, req->r_timeout);
1804 err = wait_for_completion_killable(&req->r_completion);
1806 dout("do_request waited, got %d\n", err);
1807 mutex_lock(&mdsc->mutex);
1809 /* only abort if we didn't race with a real reply */
1810 if (req->r_got_result) {
1811 err = le32_to_cpu(req->r_reply_info.head->result);
1812 } else if (err < 0) {
1813 dout("aborted request %lld with %d\n", req->r_tid, err);
1816 * ensure we aren't running concurrently with
1817 * ceph_fill_trace or ceph_readdir_prepopulate, which
1818 * rely on locks (dir mutex) held by our caller.
1820 mutex_lock(&req->r_fill_mutex);
1822 req->r_aborted = true;
1823 mutex_unlock(&req->r_fill_mutex);
1825 if (req->r_locked_dir &&
1826 (req->r_op & CEPH_MDS_OP_WRITE))
1827 ceph_invalidate_dir_request(req);
1833 mutex_unlock(&mdsc->mutex);
1834 dout("do_request %p done, result %d\n", req, err);
1839 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
1840 * namespace request.
1842 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
1844 struct inode *inode = req->r_locked_dir;
1845 struct ceph_inode_info *ci = ceph_inode(inode);
1847 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode);
1848 spin_lock(&inode->i_lock);
1849 ci->i_ceph_flags &= ~CEPH_I_COMPLETE;
1850 ci->i_release_count++;
1851 spin_unlock(&inode->i_lock);
1854 ceph_invalidate_dentry_lease(req->r_dentry);
1855 if (req->r_old_dentry)
1856 ceph_invalidate_dentry_lease(req->r_old_dentry);
1862 * We take the session mutex and parse and process the reply immediately.
1863 * This preserves the logical ordering of replies, capabilities, etc., sent
1864 * by the MDS as they are applied to our local cache.
1866 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
1868 struct ceph_mds_client *mdsc = session->s_mdsc;
1869 struct ceph_mds_request *req;
1870 struct ceph_mds_reply_head *head = msg->front.iov_base;
1871 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
1874 int mds = session->s_mds;
1876 if (msg->front.iov_len < sizeof(*head)) {
1877 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
1882 /* get request, session */
1883 tid = le64_to_cpu(msg->hdr.tid);
1884 mutex_lock(&mdsc->mutex);
1885 req = __lookup_request(mdsc, tid);
1887 dout("handle_reply on unknown tid %llu\n", tid);
1888 mutex_unlock(&mdsc->mutex);
1891 dout("handle_reply %p\n", req);
1893 /* correct session? */
1894 if (req->r_session != session) {
1895 pr_err("mdsc_handle_reply got %llu on session mds%d"
1896 " not mds%d\n", tid, session->s_mds,
1897 req->r_session ? req->r_session->s_mds : -1);
1898 mutex_unlock(&mdsc->mutex);
1903 if ((req->r_got_unsafe && !head->safe) ||
1904 (req->r_got_safe && head->safe)) {
1905 pr_warning("got a dup %s reply on %llu from mds%d\n",
1906 head->safe ? "safe" : "unsafe", tid, mds);
1907 mutex_unlock(&mdsc->mutex);
1910 if (req->r_got_safe && !head->safe) {
1911 pr_warning("got unsafe after safe on %llu from mds%d\n",
1913 mutex_unlock(&mdsc->mutex);
1917 result = le32_to_cpu(head->result);
1920 * Tolerate 2 consecutive ESTALEs from the same mds.
1921 * FIXME: we should be looking at the cap migrate_seq.
1923 if (result == -ESTALE) {
1924 req->r_direct_mode = USE_AUTH_MDS;
1926 if (req->r_num_stale <= 2) {
1927 __do_request(mdsc, req);
1928 mutex_unlock(&mdsc->mutex);
1932 req->r_num_stale = 0;
1936 req->r_got_safe = true;
1937 __unregister_request(mdsc, req);
1938 complete_all(&req->r_safe_completion);
1940 if (req->r_got_unsafe) {
1942 * We already handled the unsafe response, now do the
1943 * cleanup. No need to examine the response; the MDS
1944 * doesn't include any result info in the safe
1945 * response. And even if it did, there is nothing
1946 * useful we could do with a revised return value.
1948 dout("got safe reply %llu, mds%d\n", tid, mds);
1949 list_del_init(&req->r_unsafe_item);
1951 /* last unsafe request during umount? */
1952 if (mdsc->stopping && !__get_oldest_req(mdsc))
1953 complete_all(&mdsc->safe_umount_waiters);
1954 mutex_unlock(&mdsc->mutex);
1958 req->r_got_unsafe = true;
1959 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
1962 dout("handle_reply tid %lld result %d\n", tid, result);
1963 rinfo = &req->r_reply_info;
1964 err = parse_reply_info(msg, rinfo);
1965 mutex_unlock(&mdsc->mutex);
1967 mutex_lock(&session->s_mutex);
1969 pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds);
1975 if (rinfo->snapblob_len) {
1976 down_write(&mdsc->snap_rwsem);
1977 ceph_update_snap_trace(mdsc, rinfo->snapblob,
1978 rinfo->snapblob + rinfo->snapblob_len,
1979 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP);
1980 downgrade_write(&mdsc->snap_rwsem);
1982 down_read(&mdsc->snap_rwsem);
1985 /* insert trace into our cache */
1986 mutex_lock(&req->r_fill_mutex);
1987 err = ceph_fill_trace(mdsc->client->sb, req, req->r_session);
1989 if (result == 0 && rinfo->dir_nr)
1990 ceph_readdir_prepopulate(req, req->r_session);
1991 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
1993 mutex_unlock(&req->r_fill_mutex);
1995 up_read(&mdsc->snap_rwsem);
1997 mutex_lock(&mdsc->mutex);
1998 if (!req->r_aborted) {
2004 req->r_got_result = true;
2007 dout("reply arrived after request %lld was aborted\n", tid);
2009 mutex_unlock(&mdsc->mutex);
2011 ceph_add_cap_releases(mdsc, req->r_session);
2012 mutex_unlock(&session->s_mutex);
2014 /* kick calling process */
2015 complete_request(mdsc, req);
2017 ceph_mdsc_put_request(req);
2024 * handle mds notification that our request has been forwarded.
2026 static void handle_forward(struct ceph_mds_client *mdsc,
2027 struct ceph_mds_session *session,
2028 struct ceph_msg *msg)
2030 struct ceph_mds_request *req;
2031 u64 tid = le64_to_cpu(msg->hdr.tid);
2035 void *p = msg->front.iov_base;
2036 void *end = p + msg->front.iov_len;
2038 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2039 next_mds = ceph_decode_32(&p);
2040 fwd_seq = ceph_decode_32(&p);
2042 mutex_lock(&mdsc->mutex);
2043 req = __lookup_request(mdsc, tid);
2045 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2046 goto out; /* dup reply? */
2049 if (req->r_aborted) {
2050 dout("forward tid %llu aborted, unregistering\n", tid);
2051 __unregister_request(mdsc, req);
2052 } else if (fwd_seq <= req->r_num_fwd) {
2053 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2054 tid, next_mds, req->r_num_fwd, fwd_seq);
2056 /* resend. forward race not possible; mds would drop */
2057 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2059 BUG_ON(req->r_got_result);
2060 req->r_num_fwd = fwd_seq;
2061 req->r_resend_mds = next_mds;
2062 put_request_session(req);
2063 __do_request(mdsc, req);
2065 ceph_mdsc_put_request(req);
2067 mutex_unlock(&mdsc->mutex);
2071 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2075 * handle a mds session control message
2077 static void handle_session(struct ceph_mds_session *session,
2078 struct ceph_msg *msg)
2080 struct ceph_mds_client *mdsc = session->s_mdsc;
2083 int mds = session->s_mds;
2084 struct ceph_mds_session_head *h = msg->front.iov_base;
2088 if (msg->front.iov_len != sizeof(*h))
2090 op = le32_to_cpu(h->op);
2091 seq = le64_to_cpu(h->seq);
2093 mutex_lock(&mdsc->mutex);
2094 if (op == CEPH_SESSION_CLOSE)
2095 __unregister_session(mdsc, session);
2096 /* FIXME: this ttl calculation is generous */
2097 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2098 mutex_unlock(&mdsc->mutex);
2100 mutex_lock(&session->s_mutex);
2102 dout("handle_session mds%d %s %p state %s seq %llu\n",
2103 mds, ceph_session_op_name(op), session,
2104 session_state_name(session->s_state), seq);
2106 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2107 session->s_state = CEPH_MDS_SESSION_OPEN;
2108 pr_info("mds%d came back\n", session->s_mds);
2112 case CEPH_SESSION_OPEN:
2113 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2114 pr_info("mds%d reconnect success\n", session->s_mds);
2115 session->s_state = CEPH_MDS_SESSION_OPEN;
2116 renewed_caps(mdsc, session, 0);
2119 __close_session(mdsc, session);
2122 case CEPH_SESSION_RENEWCAPS:
2123 if (session->s_renew_seq == seq)
2124 renewed_caps(mdsc, session, 1);
2127 case CEPH_SESSION_CLOSE:
2128 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2129 pr_info("mds%d reconnect denied\n", session->s_mds);
2130 remove_session_caps(session);
2131 wake = 1; /* for good measure */
2132 complete_all(&mdsc->session_close_waiters);
2133 kick_requests(mdsc, mds);
2136 case CEPH_SESSION_STALE:
2137 pr_info("mds%d caps went stale, renewing\n",
2139 spin_lock(&session->s_cap_lock);
2140 session->s_cap_gen++;
2141 session->s_cap_ttl = 0;
2142 spin_unlock(&session->s_cap_lock);
2143 send_renew_caps(mdsc, session);
2146 case CEPH_SESSION_RECALL_STATE:
2147 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2151 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2155 mutex_unlock(&session->s_mutex);
2157 mutex_lock(&mdsc->mutex);
2158 __wake_requests(mdsc, &session->s_waiting);
2159 mutex_unlock(&mdsc->mutex);
2164 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2165 (int)msg->front.iov_len);
2172 * called under session->mutex.
2174 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2175 struct ceph_mds_session *session)
2177 struct ceph_mds_request *req, *nreq;
2180 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2182 mutex_lock(&mdsc->mutex);
2183 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2184 err = __prepare_send_request(mdsc, req, session->s_mds);
2186 ceph_msg_get(req->r_request);
2187 ceph_con_send(&session->s_con, req->r_request);
2190 mutex_unlock(&mdsc->mutex);
2194 * Encode information about a cap for a reconnect with the MDS.
2196 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2199 struct ceph_mds_cap_reconnect rec;
2200 struct ceph_inode_info *ci;
2201 struct ceph_pagelist *pagelist = arg;
2205 struct dentry *dentry;
2209 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2210 inode, ceph_vinop(inode), cap, cap->cap_id,
2211 ceph_cap_string(cap->issued));
2212 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2216 dentry = d_find_alias(inode);
2218 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2220 err = PTR_ERR(path);
2227 err = ceph_pagelist_encode_string(pagelist, path, pathlen);
2231 spin_lock(&inode->i_lock);
2232 cap->seq = 0; /* reset cap seq */
2233 cap->issue_seq = 0; /* and issue_seq */
2234 rec.cap_id = cpu_to_le64(cap->cap_id);
2235 rec.pathbase = cpu_to_le64(pathbase);
2236 rec.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2237 rec.issued = cpu_to_le32(cap->issued);
2238 rec.size = cpu_to_le64(inode->i_size);
2239 ceph_encode_timespec(&rec.mtime, &inode->i_mtime);
2240 ceph_encode_timespec(&rec.atime, &inode->i_atime);
2241 rec.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2242 spin_unlock(&inode->i_lock);
2244 err = ceph_pagelist_append(pagelist, &rec, sizeof(rec));
2254 * If an MDS fails and recovers, clients need to reconnect in order to
2255 * reestablish shared state. This includes all caps issued through
2256 * this session _and_ the snap_realm hierarchy. Because it's not
2257 * clear which snap realms the mds cares about, we send everything we
2258 * know about.. that ensures we'll then get any new info the
2259 * recovering MDS might have.
2261 * This is a relatively heavyweight operation, but it's rare.
2263 * called with mdsc->mutex held.
2265 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2266 struct ceph_mds_session *session)
2268 struct ceph_msg *reply;
2270 int mds = session->s_mds;
2272 struct ceph_pagelist *pagelist;
2274 pr_info("mds%d reconnect start\n", mds);
2276 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2278 goto fail_nopagelist;
2279 ceph_pagelist_init(pagelist);
2281 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS);
2285 mutex_lock(&session->s_mutex);
2286 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2289 ceph_con_open(&session->s_con,
2290 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
2292 /* replay unsafe requests */
2293 replay_unsafe_requests(mdsc, session);
2295 down_read(&mdsc->snap_rwsem);
2297 dout("session %p state %s\n", session,
2298 session_state_name(session->s_state));
2300 /* drop old cap expires; we're about to reestablish that state */
2301 discard_cap_releases(mdsc, session);
2303 /* traverse this session's caps */
2304 err = ceph_pagelist_encode_32(pagelist, session->s_nr_caps);
2307 err = iterate_session_caps(session, encode_caps_cb, pagelist);
2312 * snaprealms. we provide mds with the ino, seq (version), and
2313 * parent for all of our realms. If the mds has any newer info,
2316 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
2317 struct ceph_snap_realm *realm =
2318 rb_entry(p, struct ceph_snap_realm, node);
2319 struct ceph_mds_snaprealm_reconnect sr_rec;
2321 dout(" adding snap realm %llx seq %lld parent %llx\n",
2322 realm->ino, realm->seq, realm->parent_ino);
2323 sr_rec.ino = cpu_to_le64(realm->ino);
2324 sr_rec.seq = cpu_to_le64(realm->seq);
2325 sr_rec.parent = cpu_to_le64(realm->parent_ino);
2326 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
2331 reply->pagelist = pagelist;
2332 reply->hdr.data_len = cpu_to_le32(pagelist->length);
2333 reply->nr_pages = calc_pages_for(0, pagelist->length);
2334 ceph_con_send(&session->s_con, reply);
2336 mutex_unlock(&session->s_mutex);
2338 mutex_lock(&mdsc->mutex);
2339 __wake_requests(mdsc, &session->s_waiting);
2340 mutex_unlock(&mdsc->mutex);
2342 up_read(&mdsc->snap_rwsem);
2346 ceph_msg_put(reply);
2347 up_read(&mdsc->snap_rwsem);
2348 mutex_unlock(&session->s_mutex);
2350 ceph_pagelist_release(pagelist);
2353 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
2359 * compare old and new mdsmaps, kicking requests
2360 * and closing out old connections as necessary
2362 * called under mdsc->mutex.
2364 static void check_new_map(struct ceph_mds_client *mdsc,
2365 struct ceph_mdsmap *newmap,
2366 struct ceph_mdsmap *oldmap)
2369 int oldstate, newstate;
2370 struct ceph_mds_session *s;
2372 dout("check_new_map new %u old %u\n",
2373 newmap->m_epoch, oldmap->m_epoch);
2375 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
2376 if (mdsc->sessions[i] == NULL)
2378 s = mdsc->sessions[i];
2379 oldstate = ceph_mdsmap_get_state(oldmap, i);
2380 newstate = ceph_mdsmap_get_state(newmap, i);
2382 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2383 i, ceph_mds_state_name(oldstate),
2384 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
2385 ceph_mds_state_name(newstate),
2386 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
2387 session_state_name(s->s_state));
2389 if (memcmp(ceph_mdsmap_get_addr(oldmap, i),
2390 ceph_mdsmap_get_addr(newmap, i),
2391 sizeof(struct ceph_entity_addr))) {
2392 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
2393 /* the session never opened, just close it
2395 __wake_requests(mdsc, &s->s_waiting);
2396 __unregister_session(mdsc, s);
2399 mutex_unlock(&mdsc->mutex);
2400 mutex_lock(&s->s_mutex);
2401 mutex_lock(&mdsc->mutex);
2402 ceph_con_close(&s->s_con);
2403 mutex_unlock(&s->s_mutex);
2404 s->s_state = CEPH_MDS_SESSION_RESTARTING;
2407 /* kick any requests waiting on the recovering mds */
2408 kick_requests(mdsc, i);
2409 } else if (oldstate == newstate) {
2410 continue; /* nothing new with this mds */
2416 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
2417 newstate >= CEPH_MDS_STATE_RECONNECT) {
2418 mutex_unlock(&mdsc->mutex);
2419 send_mds_reconnect(mdsc, s);
2420 mutex_lock(&mdsc->mutex);
2424 * kick request on any mds that has gone active.
2426 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
2427 newstate >= CEPH_MDS_STATE_ACTIVE) {
2428 if (oldstate != CEPH_MDS_STATE_CREATING &&
2429 oldstate != CEPH_MDS_STATE_STARTING)
2430 pr_info("mds%d recovery completed\n", s->s_mds);
2431 kick_requests(mdsc, i);
2432 ceph_kick_flushing_caps(mdsc, s);
2433 wake_up_session_caps(s, 1);
2445 * caller must hold session s_mutex, dentry->d_lock
2447 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
2449 struct ceph_dentry_info *di = ceph_dentry(dentry);
2451 ceph_put_mds_session(di->lease_session);
2452 di->lease_session = NULL;
2455 static void handle_lease(struct ceph_mds_client *mdsc,
2456 struct ceph_mds_session *session,
2457 struct ceph_msg *msg)
2459 struct super_block *sb = mdsc->client->sb;
2460 struct inode *inode;
2461 struct ceph_inode_info *ci;
2462 struct dentry *parent, *dentry;
2463 struct ceph_dentry_info *di;
2464 int mds = session->s_mds;
2465 struct ceph_mds_lease *h = msg->front.iov_base;
2467 struct ceph_vino vino;
2472 dout("handle_lease from mds%d\n", mds);
2475 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
2477 vino.ino = le64_to_cpu(h->ino);
2478 vino.snap = CEPH_NOSNAP;
2479 mask = le16_to_cpu(h->mask);
2480 seq = le32_to_cpu(h->seq);
2481 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
2482 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
2483 if (dname.len != get_unaligned_le32(h+1))
2486 mutex_lock(&session->s_mutex);
2490 inode = ceph_find_inode(sb, vino);
2491 dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
2492 ceph_lease_op_name(h->action), mask, vino.ino, inode,
2493 dname.len, dname.name);
2494 if (inode == NULL) {
2495 dout("handle_lease no inode %llx\n", vino.ino);
2498 ci = ceph_inode(inode);
2501 parent = d_find_alias(inode);
2503 dout("no parent dentry on inode %p\n", inode);
2505 goto release; /* hrm... */
2507 dname.hash = full_name_hash(dname.name, dname.len);
2508 dentry = d_lookup(parent, &dname);
2513 spin_lock(&dentry->d_lock);
2514 di = ceph_dentry(dentry);
2515 switch (h->action) {
2516 case CEPH_MDS_LEASE_REVOKE:
2517 if (di && di->lease_session == session) {
2518 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
2519 h->seq = cpu_to_le32(di->lease_seq);
2520 __ceph_mdsc_drop_dentry_lease(dentry);
2525 case CEPH_MDS_LEASE_RENEW:
2526 if (di && di->lease_session == session &&
2527 di->lease_gen == session->s_cap_gen &&
2528 di->lease_renew_from &&
2529 di->lease_renew_after == 0) {
2530 unsigned long duration =
2531 le32_to_cpu(h->duration_ms) * HZ / 1000;
2533 di->lease_seq = seq;
2534 dentry->d_time = di->lease_renew_from + duration;
2535 di->lease_renew_after = di->lease_renew_from +
2537 di->lease_renew_from = 0;
2541 spin_unlock(&dentry->d_lock);
2548 /* let's just reuse the same message */
2549 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
2551 ceph_con_send(&session->s_con, msg);
2555 mutex_unlock(&session->s_mutex);
2559 pr_err("corrupt lease message\n");
2563 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
2564 struct inode *inode,
2565 struct dentry *dentry, char action,
2568 struct ceph_msg *msg;
2569 struct ceph_mds_lease *lease;
2570 int len = sizeof(*lease) + sizeof(u32);
2573 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2574 inode, dentry, ceph_lease_op_name(action), session->s_mds);
2575 dnamelen = dentry->d_name.len;
2578 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS);
2581 lease = msg->front.iov_base;
2582 lease->action = action;
2583 lease->mask = cpu_to_le16(1);
2584 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
2585 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
2586 lease->seq = cpu_to_le32(seq);
2587 put_unaligned_le32(dnamelen, lease + 1);
2588 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
2591 * if this is a preemptive lease RELEASE, no need to
2592 * flush request stream, since the actual request will
2595 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
2597 ceph_con_send(&session->s_con, msg);
2601 * Preemptively release a lease we expect to invalidate anyway.
2602 * Pass @inode always, @dentry is optional.
2604 void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc, struct inode *inode,
2605 struct dentry *dentry, int mask)
2607 struct ceph_dentry_info *di;
2608 struct ceph_mds_session *session;
2611 BUG_ON(inode == NULL);
2612 BUG_ON(dentry == NULL);
2615 /* is dentry lease valid? */
2616 spin_lock(&dentry->d_lock);
2617 di = ceph_dentry(dentry);
2618 if (!di || !di->lease_session ||
2619 di->lease_session->s_mds < 0 ||
2620 di->lease_gen != di->lease_session->s_cap_gen ||
2621 !time_before(jiffies, dentry->d_time)) {
2622 dout("lease_release inode %p dentry %p -- "
2624 inode, dentry, mask);
2625 spin_unlock(&dentry->d_lock);
2629 /* we do have a lease on this dentry; note mds and seq */
2630 session = ceph_get_mds_session(di->lease_session);
2631 seq = di->lease_seq;
2632 __ceph_mdsc_drop_dentry_lease(dentry);
2633 spin_unlock(&dentry->d_lock);
2635 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2636 inode, dentry, mask, session->s_mds);
2637 ceph_mdsc_lease_send_msg(session, inode, dentry,
2638 CEPH_MDS_LEASE_RELEASE, seq);
2639 ceph_put_mds_session(session);
2643 * drop all leases (and dentry refs) in preparation for umount
2645 static void drop_leases(struct ceph_mds_client *mdsc)
2649 dout("drop_leases\n");
2650 mutex_lock(&mdsc->mutex);
2651 for (i = 0; i < mdsc->max_sessions; i++) {
2652 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2655 mutex_unlock(&mdsc->mutex);
2656 mutex_lock(&s->s_mutex);
2657 mutex_unlock(&s->s_mutex);
2658 ceph_put_mds_session(s);
2659 mutex_lock(&mdsc->mutex);
2661 mutex_unlock(&mdsc->mutex);
2667 * delayed work -- periodically trim expired leases, renew caps with mds
2669 static void schedule_delayed(struct ceph_mds_client *mdsc)
2672 unsigned hz = round_jiffies_relative(HZ * delay);
2673 schedule_delayed_work(&mdsc->delayed_work, hz);
2676 static void delayed_work(struct work_struct *work)
2679 struct ceph_mds_client *mdsc =
2680 container_of(work, struct ceph_mds_client, delayed_work.work);
2684 dout("mdsc delayed_work\n");
2685 ceph_check_delayed_caps(mdsc);
2687 mutex_lock(&mdsc->mutex);
2688 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
2689 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
2690 mdsc->last_renew_caps);
2692 mdsc->last_renew_caps = jiffies;
2694 for (i = 0; i < mdsc->max_sessions; i++) {
2695 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
2698 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
2699 dout("resending session close request for mds%d\n",
2701 request_close_session(mdsc, s);
2702 ceph_put_mds_session(s);
2705 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
2706 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
2707 s->s_state = CEPH_MDS_SESSION_HUNG;
2708 pr_info("mds%d hung\n", s->s_mds);
2711 if (s->s_state < CEPH_MDS_SESSION_OPEN) {
2712 /* this mds is failed or recovering, just wait */
2713 ceph_put_mds_session(s);
2716 mutex_unlock(&mdsc->mutex);
2718 mutex_lock(&s->s_mutex);
2720 send_renew_caps(mdsc, s);
2722 ceph_con_keepalive(&s->s_con);
2723 ceph_add_cap_releases(mdsc, s);
2724 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
2725 s->s_state == CEPH_MDS_SESSION_HUNG)
2726 ceph_send_cap_releases(mdsc, s);
2727 mutex_unlock(&s->s_mutex);
2728 ceph_put_mds_session(s);
2730 mutex_lock(&mdsc->mutex);
2732 mutex_unlock(&mdsc->mutex);
2734 schedule_delayed(mdsc);
2738 int ceph_mdsc_init(struct ceph_mds_client *mdsc, struct ceph_client *client)
2740 mdsc->client = client;
2741 mutex_init(&mdsc->mutex);
2742 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
2743 if (mdsc->mdsmap == NULL)
2746 init_completion(&mdsc->safe_umount_waiters);
2747 init_completion(&mdsc->session_close_waiters);
2748 INIT_LIST_HEAD(&mdsc->waiting_for_map);
2749 mdsc->sessions = NULL;
2750 mdsc->max_sessions = 0;
2752 init_rwsem(&mdsc->snap_rwsem);
2753 mdsc->snap_realms = RB_ROOT;
2754 INIT_LIST_HEAD(&mdsc->snap_empty);
2755 spin_lock_init(&mdsc->snap_empty_lock);
2757 mdsc->request_tree = RB_ROOT;
2758 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
2759 mdsc->last_renew_caps = jiffies;
2760 INIT_LIST_HEAD(&mdsc->cap_delay_list);
2761 spin_lock_init(&mdsc->cap_delay_lock);
2762 INIT_LIST_HEAD(&mdsc->snap_flush_list);
2763 spin_lock_init(&mdsc->snap_flush_lock);
2764 mdsc->cap_flush_seq = 0;
2765 INIT_LIST_HEAD(&mdsc->cap_dirty);
2766 mdsc->num_cap_flushing = 0;
2767 spin_lock_init(&mdsc->cap_dirty_lock);
2768 init_waitqueue_head(&mdsc->cap_flushing_wq);
2769 spin_lock_init(&mdsc->dentry_lru_lock);
2770 INIT_LIST_HEAD(&mdsc->dentry_lru);
2772 ceph_caps_init(mdsc);
2773 ceph_adjust_min_caps(mdsc, client->min_caps);
2779 * Wait for safe replies on open mds requests. If we time out, drop
2780 * all requests from the tree to avoid dangling dentry refs.
2782 static void wait_requests(struct ceph_mds_client *mdsc)
2784 struct ceph_mds_request *req;
2785 struct ceph_client *client = mdsc->client;
2787 mutex_lock(&mdsc->mutex);
2788 if (__get_oldest_req(mdsc)) {
2789 mutex_unlock(&mdsc->mutex);
2791 dout("wait_requests waiting for requests\n");
2792 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
2793 client->mount_args->mount_timeout * HZ);
2795 /* tear down remaining requests */
2796 mutex_lock(&mdsc->mutex);
2797 while ((req = __get_oldest_req(mdsc))) {
2798 dout("wait_requests timed out on tid %llu\n",
2800 __unregister_request(mdsc, req);
2803 mutex_unlock(&mdsc->mutex);
2804 dout("wait_requests done\n");
2808 * called before mount is ro, and before dentries are torn down.
2809 * (hmm, does this still race with new lookups?)
2811 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
2813 dout("pre_umount\n");
2817 ceph_flush_dirty_caps(mdsc);
2818 wait_requests(mdsc);
2821 * wait for reply handlers to drop their request refs and
2822 * their inode/dcache refs
2828 * wait for all write mds requests to flush.
2830 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
2832 struct ceph_mds_request *req = NULL, *nextreq;
2835 mutex_lock(&mdsc->mutex);
2836 dout("wait_unsafe_requests want %lld\n", want_tid);
2838 req = __get_oldest_req(mdsc);
2839 while (req && req->r_tid <= want_tid) {
2840 /* find next request */
2841 n = rb_next(&req->r_node);
2843 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
2846 if ((req->r_op & CEPH_MDS_OP_WRITE)) {
2848 ceph_mdsc_get_request(req);
2850 ceph_mdsc_get_request(nextreq);
2851 mutex_unlock(&mdsc->mutex);
2852 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
2853 req->r_tid, want_tid);
2854 wait_for_completion(&req->r_safe_completion);
2855 mutex_lock(&mdsc->mutex);
2856 ceph_mdsc_put_request(req);
2858 break; /* next dne before, so we're done! */
2859 if (RB_EMPTY_NODE(&nextreq->r_node)) {
2860 /* next request was removed from tree */
2861 ceph_mdsc_put_request(nextreq);
2864 ceph_mdsc_put_request(nextreq); /* won't go away */
2868 mutex_unlock(&mdsc->mutex);
2869 dout("wait_unsafe_requests done\n");
2872 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
2874 u64 want_tid, want_flush;
2876 if (mdsc->client->mount_state == CEPH_MOUNT_SHUTDOWN)
2880 mutex_lock(&mdsc->mutex);
2881 want_tid = mdsc->last_tid;
2882 want_flush = mdsc->cap_flush_seq;
2883 mutex_unlock(&mdsc->mutex);
2884 dout("sync want tid %lld flush_seq %lld\n", want_tid, want_flush);
2886 ceph_flush_dirty_caps(mdsc);
2888 wait_unsafe_requests(mdsc, want_tid);
2889 wait_event(mdsc->cap_flushing_wq, check_cap_flush(mdsc, want_flush));
2894 * called after sb is ro.
2896 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
2898 struct ceph_mds_session *session;
2901 struct ceph_client *client = mdsc->client;
2902 unsigned long started, timeout = client->mount_args->mount_timeout * HZ;
2904 dout("close_sessions\n");
2906 mutex_lock(&mdsc->mutex);
2908 /* close sessions */
2910 while (time_before(jiffies, started + timeout)) {
2911 dout("closing sessions\n");
2913 for (i = 0; i < mdsc->max_sessions; i++) {
2914 session = __ceph_lookup_mds_session(mdsc, i);
2917 mutex_unlock(&mdsc->mutex);
2918 mutex_lock(&session->s_mutex);
2919 __close_session(mdsc, session);
2920 mutex_unlock(&session->s_mutex);
2921 ceph_put_mds_session(session);
2922 mutex_lock(&mdsc->mutex);
2928 if (client->mount_state == CEPH_MOUNT_SHUTDOWN)
2931 dout("waiting for sessions to close\n");
2932 mutex_unlock(&mdsc->mutex);
2933 wait_for_completion_timeout(&mdsc->session_close_waiters,
2935 mutex_lock(&mdsc->mutex);
2938 /* tear down remaining sessions */
2939 for (i = 0; i < mdsc->max_sessions; i++) {
2940 if (mdsc->sessions[i]) {
2941 session = get_session(mdsc->sessions[i]);
2942 __unregister_session(mdsc, session);
2943 mutex_unlock(&mdsc->mutex);
2944 mutex_lock(&session->s_mutex);
2945 remove_session_caps(session);
2946 mutex_unlock(&session->s_mutex);
2947 ceph_put_mds_session(session);
2948 mutex_lock(&mdsc->mutex);
2952 WARN_ON(!list_empty(&mdsc->cap_delay_list));
2954 mutex_unlock(&mdsc->mutex);
2956 ceph_cleanup_empty_realms(mdsc);
2958 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
2963 void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
2966 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
2968 ceph_mdsmap_destroy(mdsc->mdsmap);
2969 kfree(mdsc->sessions);
2970 ceph_caps_finalize(mdsc);
2975 * handle mds map update.
2977 void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
2981 void *p = msg->front.iov_base;
2982 void *end = p + msg->front.iov_len;
2983 struct ceph_mdsmap *newmap, *oldmap;
2984 struct ceph_fsid fsid;
2987 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
2988 ceph_decode_copy(&p, &fsid, sizeof(fsid));
2989 if (ceph_check_fsid(mdsc->client, &fsid) < 0)
2991 epoch = ceph_decode_32(&p);
2992 maplen = ceph_decode_32(&p);
2993 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
2995 /* do we need it? */
2996 ceph_monc_got_mdsmap(&mdsc->client->monc, epoch);
2997 mutex_lock(&mdsc->mutex);
2998 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
2999 dout("handle_map epoch %u <= our %u\n",
3000 epoch, mdsc->mdsmap->m_epoch);
3001 mutex_unlock(&mdsc->mutex);
3005 newmap = ceph_mdsmap_decode(&p, end);
3006 if (IS_ERR(newmap)) {
3007 err = PTR_ERR(newmap);
3011 /* swap into place */
3013 oldmap = mdsc->mdsmap;
3014 mdsc->mdsmap = newmap;
3015 check_new_map(mdsc, newmap, oldmap);
3016 ceph_mdsmap_destroy(oldmap);
3018 mdsc->mdsmap = newmap; /* first mds map */
3020 mdsc->client->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3022 __wake_requests(mdsc, &mdsc->waiting_for_map);
3024 mutex_unlock(&mdsc->mutex);
3025 schedule_delayed(mdsc);
3029 mutex_unlock(&mdsc->mutex);
3031 pr_err("error decoding mdsmap %d\n", err);
3035 static struct ceph_connection *con_get(struct ceph_connection *con)
3037 struct ceph_mds_session *s = con->private;
3039 if (get_session(s)) {
3040 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3043 dout("mdsc con_get %p FAIL\n", s);
3047 static void con_put(struct ceph_connection *con)
3049 struct ceph_mds_session *s = con->private;
3051 ceph_put_mds_session(s);
3052 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref));
3056 * if the client is unresponsive for long enough, the mds will kill
3057 * the session entirely.
3059 static void peer_reset(struct ceph_connection *con)
3061 struct ceph_mds_session *s = con->private;
3062 struct ceph_mds_client *mdsc = s->s_mdsc;
3064 pr_warning("mds%d closed our session\n", s->s_mds);
3065 send_mds_reconnect(mdsc, s);
3068 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3070 struct ceph_mds_session *s = con->private;
3071 struct ceph_mds_client *mdsc = s->s_mdsc;
3072 int type = le16_to_cpu(msg->hdr.type);
3074 mutex_lock(&mdsc->mutex);
3075 if (__verify_registered_session(mdsc, s) < 0) {
3076 mutex_unlock(&mdsc->mutex);
3079 mutex_unlock(&mdsc->mutex);
3082 case CEPH_MSG_MDS_MAP:
3083 ceph_mdsc_handle_map(mdsc, msg);
3085 case CEPH_MSG_CLIENT_SESSION:
3086 handle_session(s, msg);
3088 case CEPH_MSG_CLIENT_REPLY:
3089 handle_reply(s, msg);
3091 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3092 handle_forward(mdsc, s, msg);
3094 case CEPH_MSG_CLIENT_CAPS:
3095 ceph_handle_caps(s, msg);
3097 case CEPH_MSG_CLIENT_SNAP:
3098 ceph_handle_snap(mdsc, s, msg);
3100 case CEPH_MSG_CLIENT_LEASE:
3101 handle_lease(mdsc, s, msg);
3105 pr_err("received unknown message type %d %s\n", type,
3106 ceph_msg_type_name(type));
3115 static int get_authorizer(struct ceph_connection *con,
3116 void **buf, int *len, int *proto,
3117 void **reply_buf, int *reply_len, int force_new)
3119 struct ceph_mds_session *s = con->private;
3120 struct ceph_mds_client *mdsc = s->s_mdsc;
3121 struct ceph_auth_client *ac = mdsc->client->monc.auth;
3124 if (force_new && s->s_authorizer) {
3125 ac->ops->destroy_authorizer(ac, s->s_authorizer);
3126 s->s_authorizer = NULL;
3128 if (s->s_authorizer == NULL) {
3129 if (ac->ops->create_authorizer) {
3130 ret = ac->ops->create_authorizer(
3131 ac, CEPH_ENTITY_TYPE_MDS,
3133 &s->s_authorizer_buf,
3134 &s->s_authorizer_buf_len,
3135 &s->s_authorizer_reply_buf,
3136 &s->s_authorizer_reply_buf_len);
3142 *proto = ac->protocol;
3143 *buf = s->s_authorizer_buf;
3144 *len = s->s_authorizer_buf_len;
3145 *reply_buf = s->s_authorizer_reply_buf;
3146 *reply_len = s->s_authorizer_reply_buf_len;
3151 static int verify_authorizer_reply(struct ceph_connection *con, int len)
3153 struct ceph_mds_session *s = con->private;
3154 struct ceph_mds_client *mdsc = s->s_mdsc;
3155 struct ceph_auth_client *ac = mdsc->client->monc.auth;
3157 return ac->ops->verify_authorizer_reply(ac, s->s_authorizer, len);
3160 static int invalidate_authorizer(struct ceph_connection *con)
3162 struct ceph_mds_session *s = con->private;
3163 struct ceph_mds_client *mdsc = s->s_mdsc;
3164 struct ceph_auth_client *ac = mdsc->client->monc.auth;
3166 if (ac->ops->invalidate_authorizer)
3167 ac->ops->invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
3169 return ceph_monc_validate_auth(&mdsc->client->monc);
3172 static const struct ceph_connection_operations mds_con_ops = {
3175 .dispatch = dispatch,
3176 .get_authorizer = get_authorizer,
3177 .verify_authorizer_reply = verify_authorizer_reply,
3178 .invalidate_authorizer = invalidate_authorizer,
3179 .peer_reset = peer_reset,