1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/sched.h>
7 #include <linux/debugfs.h>
8 #include <linux/seq_file.h>
11 #include "mds_client.h"
13 #include <linux/ceph/messenger.h>
14 #include <linux/ceph/decode.h>
15 #include <linux/ceph/pagelist.h>
16 #include <linux/ceph/auth.h>
17 #include <linux/ceph/debugfs.h>
20 * A cluster of MDS (metadata server) daemons is responsible for
21 * managing the file system namespace (the directory hierarchy and
22 * inodes) and for coordinating shared access to storage. Metadata is
23 * partitioning hierarchically across a number of servers, and that
24 * partition varies over time as the cluster adjusts the distribution
25 * in order to balance load.
27 * The MDS client is primarily responsible to managing synchronous
28 * metadata requests for operations like open, unlink, and so forth.
29 * If there is a MDS failure, we find out about it when we (possibly
30 * request and) receive a new MDS map, and can resubmit affected
33 * For the most part, though, we take advantage of a lossless
34 * communications channel to the MDS, and do not need to worry about
35 * timing out or resubmitting requests.
37 * We maintain a stateful "session" with each MDS we interact with.
38 * Within each session, we sent periodic heartbeat messages to ensure
39 * any capabilities or leases we have been issues remain valid. If
40 * the session times out and goes stale, our leases and capabilities
41 * are no longer valid.
44 struct ceph_reconnect_state
{
45 struct ceph_pagelist
*pagelist
;
49 static void __wake_requests(struct ceph_mds_client
*mdsc
,
50 struct list_head
*head
);
52 static const struct ceph_connection_operations mds_con_ops
;
60 * parse individual inode info
62 static int parse_reply_info_in(void **p
, void *end
,
63 struct ceph_mds_reply_info_in
*info
)
68 *p
+= sizeof(struct ceph_mds_reply_inode
) +
69 sizeof(*info
->in
->fragtree
.splits
) *
70 le32_to_cpu(info
->in
->fragtree
.nsplits
);
72 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
73 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
75 *p
+= info
->symlink_len
;
77 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
78 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
79 info
->xattr_data
= *p
;
80 *p
+= info
->xattr_len
;
87 * parse a normal reply, which may contain a (dir+)dentry and/or a
90 static int parse_reply_info_trace(void **p
, void *end
,
91 struct ceph_mds_reply_info_parsed
*info
)
95 if (info
->head
->is_dentry
) {
96 err
= parse_reply_info_in(p
, end
, &info
->diri
);
100 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
103 *p
+= sizeof(*info
->dirfrag
) +
104 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
105 if (unlikely(*p
> end
))
108 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
109 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
111 *p
+= info
->dname_len
;
113 *p
+= sizeof(*info
->dlease
);
116 if (info
->head
->is_target
) {
117 err
= parse_reply_info_in(p
, end
, &info
->targeti
);
122 if (unlikely(*p
!= end
))
129 pr_err("problem parsing mds trace %d\n", err
);
134 * parse readdir results
136 static int parse_reply_info_dir(void **p
, void *end
,
137 struct ceph_mds_reply_info_parsed
*info
)
143 if (*p
+ sizeof(*info
->dir_dir
) > end
)
145 *p
+= sizeof(*info
->dir_dir
) +
146 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
150 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
151 num
= ceph_decode_32(p
);
152 info
->dir_end
= ceph_decode_8(p
);
153 info
->dir_complete
= ceph_decode_8(p
);
157 /* alloc large array */
159 info
->dir_in
= kcalloc(num
, sizeof(*info
->dir_in
) +
160 sizeof(*info
->dir_dname
) +
161 sizeof(*info
->dir_dname_len
) +
162 sizeof(*info
->dir_dlease
),
164 if (info
->dir_in
== NULL
) {
168 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
169 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
170 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
174 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
175 info
->dir_dname_len
[i
] = ceph_decode_32(p
);
176 ceph_decode_need(p
, end
, info
->dir_dname_len
[i
], bad
);
177 info
->dir_dname
[i
] = *p
;
178 *p
+= info
->dir_dname_len
[i
];
179 dout("parsed dir dname '%.*s'\n", info
->dir_dname_len
[i
],
181 info
->dir_dlease
[i
] = *p
;
182 *p
+= sizeof(struct ceph_mds_reply_lease
);
185 err
= parse_reply_info_in(p
, end
, &info
->dir_in
[i
]);
200 pr_err("problem parsing dir contents %d\n", err
);
205 * parse entire mds reply
207 static int parse_reply_info(struct ceph_msg
*msg
,
208 struct ceph_mds_reply_info_parsed
*info
)
214 info
->head
= msg
->front
.iov_base
;
215 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
216 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
219 ceph_decode_32_safe(&p
, end
, len
, bad
);
221 err
= parse_reply_info_trace(&p
, p
+len
, info
);
227 ceph_decode_32_safe(&p
, end
, len
, bad
);
229 err
= parse_reply_info_dir(&p
, p
+len
, info
);
235 ceph_decode_32_safe(&p
, end
, len
, bad
);
236 info
->snapblob_len
= len
;
247 pr_err("mds parse_reply err %d\n", err
);
251 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
260 static const char *session_state_name(int s
)
263 case CEPH_MDS_SESSION_NEW
: return "new";
264 case CEPH_MDS_SESSION_OPENING
: return "opening";
265 case CEPH_MDS_SESSION_OPEN
: return "open";
266 case CEPH_MDS_SESSION_HUNG
: return "hung";
267 case CEPH_MDS_SESSION_CLOSING
: return "closing";
268 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
269 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
270 default: return "???";
274 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
276 if (atomic_inc_not_zero(&s
->s_ref
)) {
277 dout("mdsc get_session %p %d -> %d\n", s
,
278 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
281 dout("mdsc get_session %p 0 -- FAIL", s
);
286 void ceph_put_mds_session(struct ceph_mds_session
*s
)
288 dout("mdsc put_session %p %d -> %d\n", s
,
289 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
290 if (atomic_dec_and_test(&s
->s_ref
)) {
292 s
->s_mdsc
->fsc
->client
->monc
.auth
->ops
->destroy_authorizer(
293 s
->s_mdsc
->fsc
->client
->monc
.auth
,
300 * called under mdsc->mutex
302 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
305 struct ceph_mds_session
*session
;
307 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
309 session
= mdsc
->sessions
[mds
];
310 dout("lookup_mds_session %p %d\n", session
,
311 atomic_read(&session
->s_ref
));
312 get_session(session
);
316 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
318 if (mds
>= mdsc
->max_sessions
)
320 return mdsc
->sessions
[mds
];
323 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
324 struct ceph_mds_session
*s
)
326 if (s
->s_mds
>= mdsc
->max_sessions
||
327 mdsc
->sessions
[s
->s_mds
] != s
)
333 * create+register a new session for given mds.
334 * called under mdsc->mutex.
336 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
339 struct ceph_mds_session
*s
;
341 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
343 return ERR_PTR(-ENOMEM
);
346 s
->s_state
= CEPH_MDS_SESSION_NEW
;
349 mutex_init(&s
->s_mutex
);
351 ceph_con_init(mdsc
->fsc
->client
->msgr
, &s
->s_con
);
352 s
->s_con
.private = s
;
353 s
->s_con
.ops
= &mds_con_ops
;
354 s
->s_con
.peer_name
.type
= CEPH_ENTITY_TYPE_MDS
;
355 s
->s_con
.peer_name
.num
= cpu_to_le64(mds
);
357 spin_lock_init(&s
->s_cap_lock
);
360 s
->s_renew_requested
= 0;
362 INIT_LIST_HEAD(&s
->s_caps
);
365 atomic_set(&s
->s_ref
, 1);
366 INIT_LIST_HEAD(&s
->s_waiting
);
367 INIT_LIST_HEAD(&s
->s_unsafe
);
368 s
->s_num_cap_releases
= 0;
369 s
->s_cap_iterator
= NULL
;
370 INIT_LIST_HEAD(&s
->s_cap_releases
);
371 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
372 INIT_LIST_HEAD(&s
->s_cap_flushing
);
373 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
375 dout("register_session mds%d\n", mds
);
376 if (mds
>= mdsc
->max_sessions
) {
377 int newmax
= 1 << get_count_order(mds
+1);
378 struct ceph_mds_session
**sa
;
380 dout("register_session realloc to %d\n", newmax
);
381 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
384 if (mdsc
->sessions
) {
385 memcpy(sa
, mdsc
->sessions
,
386 mdsc
->max_sessions
* sizeof(void *));
387 kfree(mdsc
->sessions
);
390 mdsc
->max_sessions
= newmax
;
392 mdsc
->sessions
[mds
] = s
;
393 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
395 ceph_con_open(&s
->s_con
, ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
401 return ERR_PTR(-ENOMEM
);
405 * called under mdsc->mutex
407 static void __unregister_session(struct ceph_mds_client
*mdsc
,
408 struct ceph_mds_session
*s
)
410 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
411 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
412 mdsc
->sessions
[s
->s_mds
] = NULL
;
413 ceph_con_close(&s
->s_con
);
414 ceph_put_mds_session(s
);
418 * drop session refs in request.
420 * should be last request ref, or hold mdsc->mutex
422 static void put_request_session(struct ceph_mds_request
*req
)
424 if (req
->r_session
) {
425 ceph_put_mds_session(req
->r_session
);
426 req
->r_session
= NULL
;
430 void ceph_mdsc_release_request(struct kref
*kref
)
432 struct ceph_mds_request
*req
= container_of(kref
,
433 struct ceph_mds_request
,
436 ceph_msg_put(req
->r_request
);
438 ceph_msg_put(req
->r_reply
);
439 destroy_reply_info(&req
->r_reply_info
);
442 ceph_put_cap_refs(ceph_inode(req
->r_inode
),
446 if (req
->r_locked_dir
)
447 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
),
449 if (req
->r_target_inode
)
450 iput(req
->r_target_inode
);
453 if (req
->r_old_dentry
) {
455 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
457 dput(req
->r_old_dentry
);
461 put_request_session(req
);
462 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
467 * lookup session, bump ref if found.
469 * called under mdsc->mutex.
471 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
474 struct ceph_mds_request
*req
;
475 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
478 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
479 if (tid
< req
->r_tid
)
481 else if (tid
> req
->r_tid
)
484 ceph_mdsc_get_request(req
);
491 static void __insert_request(struct ceph_mds_client
*mdsc
,
492 struct ceph_mds_request
*new)
494 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
495 struct rb_node
*parent
= NULL
;
496 struct ceph_mds_request
*req
= NULL
;
500 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
501 if (new->r_tid
< req
->r_tid
)
503 else if (new->r_tid
> req
->r_tid
)
509 rb_link_node(&new->r_node
, parent
, p
);
510 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
514 * Register an in-flight request, and assign a tid. Link to directory
515 * are modifying (if any).
517 * Called under mdsc->mutex.
519 static void __register_request(struct ceph_mds_client
*mdsc
,
520 struct ceph_mds_request
*req
,
523 req
->r_tid
= ++mdsc
->last_tid
;
525 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
527 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
528 ceph_mdsc_get_request(req
);
529 __insert_request(mdsc
, req
);
532 struct ceph_inode_info
*ci
= ceph_inode(dir
);
534 spin_lock(&ci
->i_unsafe_lock
);
535 req
->r_unsafe_dir
= dir
;
536 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
537 spin_unlock(&ci
->i_unsafe_lock
);
541 static void __unregister_request(struct ceph_mds_client
*mdsc
,
542 struct ceph_mds_request
*req
)
544 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
545 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
546 RB_CLEAR_NODE(&req
->r_node
);
548 if (req
->r_unsafe_dir
) {
549 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
551 spin_lock(&ci
->i_unsafe_lock
);
552 list_del_init(&req
->r_unsafe_dir_item
);
553 spin_unlock(&ci
->i_unsafe_lock
);
556 ceph_mdsc_put_request(req
);
560 * Choose mds to send request to next. If there is a hint set in the
561 * request (e.g., due to a prior forward hint from the mds), use that.
562 * Otherwise, consult frag tree and/or caps to identify the
563 * appropriate mds. If all else fails, choose randomly.
565 * Called under mdsc->mutex.
567 struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
569 while (!IS_ROOT(dentry
) && ceph_snap(dentry
->d_inode
) != CEPH_NOSNAP
)
570 dentry
= dentry
->d_parent
;
574 static int __choose_mds(struct ceph_mds_client
*mdsc
,
575 struct ceph_mds_request
*req
)
578 struct ceph_inode_info
*ci
;
579 struct ceph_cap
*cap
;
580 int mode
= req
->r_direct_mode
;
582 u32 hash
= req
->r_direct_hash
;
583 bool is_hash
= req
->r_direct_is_hash
;
586 * is there a specific mds we should try? ignore hint if we have
587 * no session and the mds is not up (active or recovering).
589 if (req
->r_resend_mds
>= 0 &&
590 (__have_session(mdsc
, req
->r_resend_mds
) ||
591 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
592 dout("choose_mds using resend_mds mds%d\n",
594 return req
->r_resend_mds
;
597 if (mode
== USE_RANDOM_MDS
)
602 inode
= req
->r_inode
;
603 } else if (req
->r_dentry
) {
604 struct inode
*dir
= req
->r_dentry
->d_parent
->d_inode
;
606 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
608 inode
= req
->r_dentry
->d_inode
;
609 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
610 /* direct snapped/virtual snapdir requests
611 * based on parent dir inode */
613 get_nonsnap_parent(req
->r_dentry
->d_parent
);
615 dout("__choose_mds using nonsnap parent %p\n", inode
);
616 } else if (req
->r_dentry
->d_inode
) {
618 inode
= req
->r_dentry
->d_inode
;
622 hash
= req
->r_dentry
->d_name
.hash
;
627 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
631 ci
= ceph_inode(inode
);
633 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
634 struct ceph_inode_frag frag
;
637 ceph_choose_frag(ci
, hash
, &frag
, &found
);
639 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
642 /* choose a random replica */
643 get_random_bytes(&r
, 1);
646 dout("choose_mds %p %llx.%llx "
647 "frag %u mds%d (%d/%d)\n",
648 inode
, ceph_vinop(inode
),
654 /* since this file/dir wasn't known to be
655 * replicated, then we want to look for the
656 * authoritative mds. */
659 /* choose auth mds */
661 dout("choose_mds %p %llx.%llx "
662 "frag %u mds%d (auth)\n",
663 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
669 spin_lock(&inode
->i_lock
);
671 if (mode
== USE_AUTH_MDS
)
672 cap
= ci
->i_auth_cap
;
673 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
674 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
676 spin_unlock(&inode
->i_lock
);
679 mds
= cap
->session
->s_mds
;
680 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
681 inode
, ceph_vinop(inode
), mds
,
682 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
683 spin_unlock(&inode
->i_lock
);
687 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
688 dout("choose_mds chose random mds%d\n", mds
);
696 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
698 struct ceph_msg
*msg
;
699 struct ceph_mds_session_head
*h
;
701 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
);
703 pr_err("create_session_msg ENOMEM creating msg\n");
706 h
= msg
->front
.iov_base
;
707 h
->op
= cpu_to_le32(op
);
708 h
->seq
= cpu_to_le64(seq
);
713 * send session open request.
715 * called under mdsc->mutex
717 static int __open_session(struct ceph_mds_client
*mdsc
,
718 struct ceph_mds_session
*session
)
720 struct ceph_msg
*msg
;
722 int mds
= session
->s_mds
;
724 /* wait for mds to go active? */
725 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
726 dout("open_session to mds%d (%s)\n", mds
,
727 ceph_mds_state_name(mstate
));
728 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
729 session
->s_renew_requested
= jiffies
;
731 /* send connect message */
732 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
735 ceph_con_send(&session
->s_con
, msg
);
740 * open sessions for any export targets for the given mds
742 * called under mdsc->mutex
744 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
745 struct ceph_mds_session
*session
)
747 struct ceph_mds_info
*mi
;
748 struct ceph_mds_session
*ts
;
749 int i
, mds
= session
->s_mds
;
752 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
754 mi
= &mdsc
->mdsmap
->m_info
[mds
];
755 dout("open_export_target_sessions for mds%d (%d targets)\n",
756 session
->s_mds
, mi
->num_export_targets
);
758 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
759 target
= mi
->export_targets
[i
];
760 ts
= __ceph_lookup_mds_session(mdsc
, target
);
762 ts
= register_session(mdsc
, target
);
766 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
767 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
768 __open_session(mdsc
, session
);
770 dout(" mds%d target mds%d %p is %s\n", session
->s_mds
,
771 i
, ts
, session_state_name(ts
->s_state
));
772 ceph_put_mds_session(ts
);
776 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
777 struct ceph_mds_session
*session
)
779 mutex_lock(&mdsc
->mutex
);
780 __open_export_target_sessions(mdsc
, session
);
781 mutex_unlock(&mdsc
->mutex
);
789 * Free preallocated cap messages assigned to this session
791 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
793 struct ceph_msg
*msg
;
795 spin_lock(&session
->s_cap_lock
);
796 while (!list_empty(&session
->s_cap_releases
)) {
797 msg
= list_first_entry(&session
->s_cap_releases
,
798 struct ceph_msg
, list_head
);
799 list_del_init(&msg
->list_head
);
802 while (!list_empty(&session
->s_cap_releases_done
)) {
803 msg
= list_first_entry(&session
->s_cap_releases_done
,
804 struct ceph_msg
, list_head
);
805 list_del_init(&msg
->list_head
);
808 spin_unlock(&session
->s_cap_lock
);
812 * Helper to safely iterate over all caps associated with a session, with
813 * special care taken to handle a racing __ceph_remove_cap().
815 * Caller must hold session s_mutex.
817 static int iterate_session_caps(struct ceph_mds_session
*session
,
818 int (*cb
)(struct inode
*, struct ceph_cap
*,
822 struct ceph_cap
*cap
;
823 struct inode
*inode
, *last_inode
= NULL
;
824 struct ceph_cap
*old_cap
= NULL
;
827 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
828 spin_lock(&session
->s_cap_lock
);
829 p
= session
->s_caps
.next
;
830 while (p
!= &session
->s_caps
) {
831 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
832 inode
= igrab(&cap
->ci
->vfs_inode
);
837 session
->s_cap_iterator
= cap
;
838 spin_unlock(&session
->s_cap_lock
);
845 ceph_put_cap(session
->s_mdsc
, old_cap
);
849 ret
= cb(inode
, cap
, arg
);
852 spin_lock(&session
->s_cap_lock
);
854 if (cap
->ci
== NULL
) {
855 dout("iterate_session_caps finishing cap %p removal\n",
857 BUG_ON(cap
->session
!= session
);
858 list_del_init(&cap
->session_caps
);
859 session
->s_nr_caps
--;
861 old_cap
= cap
; /* put_cap it w/o locks held */
868 session
->s_cap_iterator
= NULL
;
869 spin_unlock(&session
->s_cap_lock
);
874 ceph_put_cap(session
->s_mdsc
, old_cap
);
879 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
882 struct ceph_inode_info
*ci
= ceph_inode(inode
);
885 dout("removing cap %p, ci is %p, inode is %p\n",
886 cap
, ci
, &ci
->vfs_inode
);
887 spin_lock(&inode
->i_lock
);
888 __ceph_remove_cap(cap
);
889 if (!__ceph_is_any_real_caps(ci
)) {
890 struct ceph_mds_client
*mdsc
=
891 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
893 spin_lock(&mdsc
->cap_dirty_lock
);
894 if (!list_empty(&ci
->i_dirty_item
)) {
895 pr_info(" dropping dirty %s state for %p %lld\n",
896 ceph_cap_string(ci
->i_dirty_caps
),
897 inode
, ceph_ino(inode
));
898 ci
->i_dirty_caps
= 0;
899 list_del_init(&ci
->i_dirty_item
);
902 if (!list_empty(&ci
->i_flushing_item
)) {
903 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
904 ceph_cap_string(ci
->i_flushing_caps
),
905 inode
, ceph_ino(inode
));
906 ci
->i_flushing_caps
= 0;
907 list_del_init(&ci
->i_flushing_item
);
908 mdsc
->num_cap_flushing
--;
911 if (drop
&& ci
->i_wrbuffer_ref
) {
912 pr_info(" dropping dirty data for %p %lld\n",
913 inode
, ceph_ino(inode
));
914 ci
->i_wrbuffer_ref
= 0;
915 ci
->i_wrbuffer_ref_head
= 0;
918 spin_unlock(&mdsc
->cap_dirty_lock
);
920 spin_unlock(&inode
->i_lock
);
927 * caller must hold session s_mutex
929 static void remove_session_caps(struct ceph_mds_session
*session
)
931 dout("remove_session_caps on %p\n", session
);
932 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
933 BUG_ON(session
->s_nr_caps
> 0);
934 BUG_ON(!list_empty(&session
->s_cap_flushing
));
935 cleanup_cap_releases(session
);
939 * wake up any threads waiting on this session's caps. if the cap is
940 * old (didn't get renewed on the client reconnect), remove it now.
942 * caller must hold s_mutex.
944 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
947 struct ceph_inode_info
*ci
= ceph_inode(inode
);
949 wake_up_all(&ci
->i_cap_wq
);
951 spin_lock(&inode
->i_lock
);
952 ci
->i_wanted_max_size
= 0;
953 ci
->i_requested_max_size
= 0;
954 spin_unlock(&inode
->i_lock
);
959 static void wake_up_session_caps(struct ceph_mds_session
*session
,
962 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
963 iterate_session_caps(session
, wake_up_session_cb
,
964 (void *)(unsigned long)reconnect
);
968 * Send periodic message to MDS renewing all currently held caps. The
969 * ack will reset the expiration for all caps from this session.
971 * caller holds s_mutex
973 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
974 struct ceph_mds_session
*session
)
976 struct ceph_msg
*msg
;
979 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
980 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
981 pr_info("mds%d caps stale\n", session
->s_mds
);
982 session
->s_renew_requested
= jiffies
;
984 /* do not try to renew caps until a recovering mds has reconnected
985 * with its clients. */
986 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
987 if (state
< CEPH_MDS_STATE_RECONNECT
) {
988 dout("send_renew_caps ignoring mds%d (%s)\n",
989 session
->s_mds
, ceph_mds_state_name(state
));
993 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
994 ceph_mds_state_name(state
));
995 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
996 ++session
->s_renew_seq
);
999 ceph_con_send(&session
->s_con
, msg
);
1004 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1006 * Called under session->s_mutex
1008 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1009 struct ceph_mds_session
*session
, int is_renew
)
1014 spin_lock(&session
->s_cap_lock
);
1015 was_stale
= is_renew
&& (session
->s_cap_ttl
== 0 ||
1016 time_after_eq(jiffies
, session
->s_cap_ttl
));
1018 session
->s_cap_ttl
= session
->s_renew_requested
+
1019 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1022 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1023 pr_info("mds%d caps renewed\n", session
->s_mds
);
1026 pr_info("mds%d caps still stale\n", session
->s_mds
);
1029 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1030 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1031 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1032 spin_unlock(&session
->s_cap_lock
);
1035 wake_up_session_caps(session
, 0);
1039 * send a session close request
1041 static int request_close_session(struct ceph_mds_client
*mdsc
,
1042 struct ceph_mds_session
*session
)
1044 struct ceph_msg
*msg
;
1046 dout("request_close_session mds%d state %s seq %lld\n",
1047 session
->s_mds
, session_state_name(session
->s_state
),
1049 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1052 ceph_con_send(&session
->s_con
, msg
);
1057 * Called with s_mutex held.
1059 static int __close_session(struct ceph_mds_client
*mdsc
,
1060 struct ceph_mds_session
*session
)
1062 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1064 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1065 return request_close_session(mdsc
, session
);
1069 * Trim old(er) caps.
1071 * Because we can't cache an inode without one or more caps, we do
1072 * this indirectly: if a cap is unused, we prune its aliases, at which
1073 * point the inode will hopefully get dropped to.
1075 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1076 * memory pressure from the MDS, though, so it needn't be perfect.
1078 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1080 struct ceph_mds_session
*session
= arg
;
1081 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1082 int used
, oissued
, mine
;
1084 if (session
->s_trim_caps
<= 0)
1087 spin_lock(&inode
->i_lock
);
1088 mine
= cap
->issued
| cap
->implemented
;
1089 used
= __ceph_caps_used(ci
);
1090 oissued
= __ceph_caps_issued_other(ci
, cap
);
1092 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1093 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1094 ceph_cap_string(used
));
1095 if (ci
->i_dirty_caps
)
1096 goto out
; /* dirty caps */
1097 if ((used
& ~oissued
) & mine
)
1098 goto out
; /* we need these caps */
1100 session
->s_trim_caps
--;
1102 /* we aren't the only cap.. just remove us */
1103 __ceph_remove_cap(cap
);
1105 /* try to drop referring dentries */
1106 spin_unlock(&inode
->i_lock
);
1107 d_prune_aliases(inode
);
1108 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1109 inode
, cap
, atomic_read(&inode
->i_count
));
1114 spin_unlock(&inode
->i_lock
);
1119 * Trim session cap count down to some max number.
1121 static int trim_caps(struct ceph_mds_client
*mdsc
,
1122 struct ceph_mds_session
*session
,
1125 int trim_caps
= session
->s_nr_caps
- max_caps
;
1127 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1128 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1129 if (trim_caps
> 0) {
1130 session
->s_trim_caps
= trim_caps
;
1131 iterate_session_caps(session
, trim_caps_cb
, session
);
1132 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1133 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1134 trim_caps
- session
->s_trim_caps
);
1135 session
->s_trim_caps
= 0;
1141 * Allocate cap_release messages. If there is a partially full message
1142 * in the queue, try to allocate enough to cover it's remainder, so that
1143 * we can send it immediately.
1145 * Called under s_mutex.
1147 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1148 struct ceph_mds_session
*session
)
1150 struct ceph_msg
*msg
, *partial
= NULL
;
1151 struct ceph_mds_cap_release
*head
;
1153 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1156 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1159 spin_lock(&session
->s_cap_lock
);
1161 if (!list_empty(&session
->s_cap_releases
)) {
1162 msg
= list_first_entry(&session
->s_cap_releases
,
1165 head
= msg
->front
.iov_base
;
1166 num
= le32_to_cpu(head
->num
);
1168 dout(" partial %p with (%d/%d)\n", msg
, num
,
1169 (int)CEPH_CAPS_PER_RELEASE
);
1170 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1174 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1175 spin_unlock(&session
->s_cap_lock
);
1176 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1180 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1181 (int)msg
->front
.iov_len
);
1182 head
= msg
->front
.iov_base
;
1183 head
->num
= cpu_to_le32(0);
1184 msg
->front
.iov_len
= sizeof(*head
);
1185 spin_lock(&session
->s_cap_lock
);
1186 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1187 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1191 head
= partial
->front
.iov_base
;
1192 num
= le32_to_cpu(head
->num
);
1193 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1194 (int)CEPH_CAPS_PER_RELEASE
);
1195 list_move_tail(&partial
->list_head
,
1196 &session
->s_cap_releases_done
);
1197 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1200 spin_unlock(&session
->s_cap_lock
);
1206 * flush all dirty inode data to disk.
1208 * returns true if we've flushed through want_flush_seq
1210 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1214 dout("check_cap_flush want %lld\n", want_flush_seq
);
1215 mutex_lock(&mdsc
->mutex
);
1216 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1217 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1221 get_session(session
);
1222 mutex_unlock(&mdsc
->mutex
);
1224 mutex_lock(&session
->s_mutex
);
1225 if (!list_empty(&session
->s_cap_flushing
)) {
1226 struct ceph_inode_info
*ci
=
1227 list_entry(session
->s_cap_flushing
.next
,
1228 struct ceph_inode_info
,
1230 struct inode
*inode
= &ci
->vfs_inode
;
1232 spin_lock(&inode
->i_lock
);
1233 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1234 dout("check_cap_flush still flushing %p "
1235 "seq %lld <= %lld to mds%d\n", inode
,
1236 ci
->i_cap_flush_seq
, want_flush_seq
,
1240 spin_unlock(&inode
->i_lock
);
1242 mutex_unlock(&session
->s_mutex
);
1243 ceph_put_mds_session(session
);
1247 mutex_lock(&mdsc
->mutex
);
1250 mutex_unlock(&mdsc
->mutex
);
1251 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1256 * called under s_mutex
1258 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1259 struct ceph_mds_session
*session
)
1261 struct ceph_msg
*msg
;
1263 dout("send_cap_releases mds%d\n", session
->s_mds
);
1264 spin_lock(&session
->s_cap_lock
);
1265 while (!list_empty(&session
->s_cap_releases_done
)) {
1266 msg
= list_first_entry(&session
->s_cap_releases_done
,
1267 struct ceph_msg
, list_head
);
1268 list_del_init(&msg
->list_head
);
1269 spin_unlock(&session
->s_cap_lock
);
1270 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1271 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1272 ceph_con_send(&session
->s_con
, msg
);
1273 spin_lock(&session
->s_cap_lock
);
1275 spin_unlock(&session
->s_cap_lock
);
1278 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1279 struct ceph_mds_session
*session
)
1281 struct ceph_msg
*msg
;
1282 struct ceph_mds_cap_release
*head
;
1285 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1286 spin_lock(&session
->s_cap_lock
);
1288 /* zero out the in-progress message */
1289 msg
= list_first_entry(&session
->s_cap_releases
,
1290 struct ceph_msg
, list_head
);
1291 head
= msg
->front
.iov_base
;
1292 num
= le32_to_cpu(head
->num
);
1293 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
, num
);
1294 head
->num
= cpu_to_le32(0);
1295 session
->s_num_cap_releases
+= num
;
1297 /* requeue completed messages */
1298 while (!list_empty(&session
->s_cap_releases_done
)) {
1299 msg
= list_first_entry(&session
->s_cap_releases_done
,
1300 struct ceph_msg
, list_head
);
1301 list_del_init(&msg
->list_head
);
1303 head
= msg
->front
.iov_base
;
1304 num
= le32_to_cpu(head
->num
);
1305 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1307 session
->s_num_cap_releases
+= num
;
1308 head
->num
= cpu_to_le32(0);
1309 msg
->front
.iov_len
= sizeof(*head
);
1310 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1313 spin_unlock(&session
->s_cap_lock
);
1321 * Create an mds request.
1323 struct ceph_mds_request
*
1324 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1326 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1329 return ERR_PTR(-ENOMEM
);
1331 mutex_init(&req
->r_fill_mutex
);
1333 req
->r_started
= jiffies
;
1334 req
->r_resend_mds
= -1;
1335 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1337 kref_init(&req
->r_kref
);
1338 INIT_LIST_HEAD(&req
->r_wait
);
1339 init_completion(&req
->r_completion
);
1340 init_completion(&req
->r_safe_completion
);
1341 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1344 req
->r_direct_mode
= mode
;
1349 * return oldest (lowest) request, tid in request tree, 0 if none.
1351 * called under mdsc->mutex.
1353 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1355 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1357 return rb_entry(rb_first(&mdsc
->request_tree
),
1358 struct ceph_mds_request
, r_node
);
1361 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1363 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1371 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1372 * on build_path_from_dentry in fs/cifs/dir.c.
1374 * If @stop_on_nosnap, generate path relative to the first non-snapped
1377 * Encode hidden .snap dirs as a double /, i.e.
1378 * foo/.snap/bar -> foo//bar
1380 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1383 struct dentry
*temp
;
1388 return ERR_PTR(-EINVAL
);
1392 for (temp
= dentry
; !IS_ROOT(temp
);) {
1393 struct inode
*inode
= temp
->d_inode
;
1394 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1395 len
++; /* slash only */
1396 else if (stop_on_nosnap
&& inode
&&
1397 ceph_snap(inode
) == CEPH_NOSNAP
)
1400 len
+= 1 + temp
->d_name
.len
;
1401 temp
= temp
->d_parent
;
1403 pr_err("build_path corrupt dentry %p\n", dentry
);
1404 return ERR_PTR(-EINVAL
);
1408 len
--; /* no leading '/' */
1410 path
= kmalloc(len
+1, GFP_NOFS
);
1412 return ERR_PTR(-ENOMEM
);
1414 path
[pos
] = 0; /* trailing null */
1415 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1416 struct inode
*inode
= temp
->d_inode
;
1418 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1419 dout("build_path path+%d: %p SNAPDIR\n",
1421 } else if (stop_on_nosnap
&& inode
&&
1422 ceph_snap(inode
) == CEPH_NOSNAP
) {
1425 pos
-= temp
->d_name
.len
;
1428 strncpy(path
+ pos
, temp
->d_name
.name
,
1433 temp
= temp
->d_parent
;
1435 pr_err("build_path corrupt dentry\n");
1437 return ERR_PTR(-EINVAL
);
1441 pr_err("build_path did not end path lookup where "
1442 "expected, namelen is %d, pos is %d\n", len
, pos
);
1443 /* presumably this is only possible if racing with a
1444 rename of one of the parent directories (we can not
1445 lock the dentries above us to prevent this, but
1446 retrying should be harmless) */
1451 *base
= ceph_ino(temp
->d_inode
);
1453 dout("build_path on %p %d built %llx '%.*s'\n",
1454 dentry
, atomic_read(&dentry
->d_count
), *base
, len
, path
);
1458 static int build_dentry_path(struct dentry
*dentry
,
1459 const char **ppath
, int *ppathlen
, u64
*pino
,
1464 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1465 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1466 *ppath
= dentry
->d_name
.name
;
1467 *ppathlen
= dentry
->d_name
.len
;
1470 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1472 return PTR_ERR(path
);
1478 static int build_inode_path(struct inode
*inode
,
1479 const char **ppath
, int *ppathlen
, u64
*pino
,
1482 struct dentry
*dentry
;
1485 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1486 *pino
= ceph_ino(inode
);
1490 dentry
= d_find_alias(inode
);
1491 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1494 return PTR_ERR(path
);
1501 * request arguments may be specified via an inode *, a dentry *, or
1502 * an explicit ino+path.
1504 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1505 const char *rpath
, u64 rino
,
1506 const char **ppath
, int *pathlen
,
1507 u64
*ino
, int *freepath
)
1512 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1513 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1515 } else if (rdentry
) {
1516 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1517 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1522 *pathlen
= strlen(rpath
);
1523 dout(" path %.*s\n", *pathlen
, rpath
);
1530 * called under mdsc->mutex
1532 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1533 struct ceph_mds_request
*req
,
1536 struct ceph_msg
*msg
;
1537 struct ceph_mds_request_head
*head
;
1538 const char *path1
= NULL
;
1539 const char *path2
= NULL
;
1540 u64 ino1
= 0, ino2
= 0;
1541 int pathlen1
= 0, pathlen2
= 0;
1542 int freepath1
= 0, freepath2
= 0;
1548 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1549 req
->r_path1
, req
->r_ino1
.ino
,
1550 &path1
, &pathlen1
, &ino1
, &freepath1
);
1556 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1557 req
->r_path2
, req
->r_ino2
.ino
,
1558 &path2
, &pathlen2
, &ino2
, &freepath2
);
1564 len
= sizeof(*head
) +
1565 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1567 /* calculate (max) length for cap releases */
1568 len
+= sizeof(struct ceph_mds_request_release
) *
1569 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1570 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1571 if (req
->r_dentry_drop
)
1572 len
+= req
->r_dentry
->d_name
.len
;
1573 if (req
->r_old_dentry_drop
)
1574 len
+= req
->r_old_dentry
->d_name
.len
;
1576 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
);
1578 msg
= ERR_PTR(-ENOMEM
);
1582 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1584 head
= msg
->front
.iov_base
;
1585 p
= msg
->front
.iov_base
+ sizeof(*head
);
1586 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1588 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1589 head
->op
= cpu_to_le32(req
->r_op
);
1590 head
->caller_uid
= cpu_to_le32(current_fsuid());
1591 head
->caller_gid
= cpu_to_le32(current_fsgid());
1592 head
->args
= req
->r_args
;
1594 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1595 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1597 /* make note of release offset, in case we need to replay */
1598 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1602 if (req
->r_inode_drop
)
1603 releases
+= ceph_encode_inode_release(&p
,
1604 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1605 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1606 if (req
->r_dentry_drop
)
1607 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1608 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1609 if (req
->r_old_dentry_drop
)
1610 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1611 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1612 if (req
->r_old_inode_drop
)
1613 releases
+= ceph_encode_inode_release(&p
,
1614 req
->r_old_dentry
->d_inode
,
1615 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1616 head
->num_releases
= cpu_to_le16(releases
);
1619 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1620 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1622 msg
->pages
= req
->r_pages
;
1623 msg
->nr_pages
= req
->r_num_pages
;
1624 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1625 msg
->hdr
.data_off
= cpu_to_le16(0);
1629 kfree((char *)path2
);
1632 kfree((char *)path1
);
1638 * called under mdsc->mutex if error, under no mutex if
1641 static void complete_request(struct ceph_mds_client
*mdsc
,
1642 struct ceph_mds_request
*req
)
1644 if (req
->r_callback
)
1645 req
->r_callback(mdsc
, req
);
1647 complete_all(&req
->r_completion
);
1651 * called under mdsc->mutex
1653 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1654 struct ceph_mds_request
*req
,
1657 struct ceph_mds_request_head
*rhead
;
1658 struct ceph_msg
*msg
;
1664 struct ceph_cap
*cap
=
1665 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
1668 req
->r_sent_on_mseq
= cap
->mseq
;
1670 req
->r_sent_on_mseq
= -1;
1672 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1673 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1675 if (req
->r_got_unsafe
) {
1677 * Replay. Do not regenerate message (and rebuild
1678 * paths, etc.); just use the original message.
1679 * Rebuilding paths will break for renames because
1680 * d_move mangles the src name.
1682 msg
= req
->r_request
;
1683 rhead
= msg
->front
.iov_base
;
1685 flags
= le32_to_cpu(rhead
->flags
);
1686 flags
|= CEPH_MDS_FLAG_REPLAY
;
1687 rhead
->flags
= cpu_to_le32(flags
);
1689 if (req
->r_target_inode
)
1690 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1692 rhead
->num_retry
= req
->r_attempts
- 1;
1694 /* remove cap/dentry releases from message */
1695 rhead
->num_releases
= 0;
1696 msg
->hdr
.front_len
= cpu_to_le32(req
->r_request_release_offset
);
1697 msg
->front
.iov_len
= req
->r_request_release_offset
;
1701 if (req
->r_request
) {
1702 ceph_msg_put(req
->r_request
);
1703 req
->r_request
= NULL
;
1705 msg
= create_request_message(mdsc
, req
, mds
);
1707 req
->r_err
= PTR_ERR(msg
);
1708 complete_request(mdsc
, req
);
1709 return PTR_ERR(msg
);
1711 req
->r_request
= msg
;
1713 rhead
= msg
->front
.iov_base
;
1714 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1715 if (req
->r_got_unsafe
)
1716 flags
|= CEPH_MDS_FLAG_REPLAY
;
1717 if (req
->r_locked_dir
)
1718 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1719 rhead
->flags
= cpu_to_le32(flags
);
1720 rhead
->num_fwd
= req
->r_num_fwd
;
1721 rhead
->num_retry
= req
->r_attempts
- 1;
1724 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1729 * send request, or put it on the appropriate wait list.
1731 static int __do_request(struct ceph_mds_client
*mdsc
,
1732 struct ceph_mds_request
*req
)
1734 struct ceph_mds_session
*session
= NULL
;
1738 if (req
->r_err
|| req
->r_got_result
)
1741 if (req
->r_timeout
&&
1742 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1743 dout("do_request timed out\n");
1748 mds
= __choose_mds(mdsc
, req
);
1750 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1751 dout("do_request no mds or not active, waiting for map\n");
1752 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1756 /* get, open session */
1757 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1759 session
= register_session(mdsc
, mds
);
1760 if (IS_ERR(session
)) {
1761 err
= PTR_ERR(session
);
1765 dout("do_request mds%d session %p state %s\n", mds
, session
,
1766 session_state_name(session
->s_state
));
1767 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1768 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
1769 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
1770 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
1771 __open_session(mdsc
, session
);
1772 list_add(&req
->r_wait
, &session
->s_waiting
);
1777 req
->r_session
= get_session(session
);
1778 req
->r_resend_mds
= -1; /* forget any previous mds hint */
1780 if (req
->r_request_started
== 0) /* note request start time */
1781 req
->r_request_started
= jiffies
;
1783 err
= __prepare_send_request(mdsc
, req
, mds
);
1785 ceph_msg_get(req
->r_request
);
1786 ceph_con_send(&session
->s_con
, req
->r_request
);
1790 ceph_put_mds_session(session
);
1796 complete_request(mdsc
, req
);
1801 * called under mdsc->mutex
1803 static void __wake_requests(struct ceph_mds_client
*mdsc
,
1804 struct list_head
*head
)
1806 struct ceph_mds_request
*req
, *nreq
;
1808 list_for_each_entry_safe(req
, nreq
, head
, r_wait
) {
1809 list_del_init(&req
->r_wait
);
1810 __do_request(mdsc
, req
);
1815 * Wake up threads with requests pending for @mds, so that they can
1816 * resubmit their requests to a possibly different mds.
1818 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
1820 struct ceph_mds_request
*req
;
1823 dout("kick_requests mds%d\n", mds
);
1824 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
1825 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1826 if (req
->r_got_unsafe
)
1828 if (req
->r_session
&&
1829 req
->r_session
->s_mds
== mds
) {
1830 dout(" kicking tid %llu\n", req
->r_tid
);
1831 put_request_session(req
);
1832 __do_request(mdsc
, req
);
1837 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
1838 struct ceph_mds_request
*req
)
1840 dout("submit_request on %p\n", req
);
1841 mutex_lock(&mdsc
->mutex
);
1842 __register_request(mdsc
, req
, NULL
);
1843 __do_request(mdsc
, req
);
1844 mutex_unlock(&mdsc
->mutex
);
1848 * Synchrously perform an mds request. Take care of all of the
1849 * session setup, forwarding, retry details.
1851 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
1853 struct ceph_mds_request
*req
)
1857 dout("do_request on %p\n", req
);
1859 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1861 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
1862 if (req
->r_locked_dir
)
1863 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
1864 if (req
->r_old_dentry
)
1866 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
1870 mutex_lock(&mdsc
->mutex
);
1871 __register_request(mdsc
, req
, dir
);
1872 __do_request(mdsc
, req
);
1876 __unregister_request(mdsc
, req
);
1877 dout("do_request early error %d\n", err
);
1882 mutex_unlock(&mdsc
->mutex
);
1883 dout("do_request waiting\n");
1884 if (req
->r_timeout
) {
1885 err
= (long)wait_for_completion_killable_timeout(
1886 &req
->r_completion
, req
->r_timeout
);
1890 err
= wait_for_completion_killable(&req
->r_completion
);
1892 dout("do_request waited, got %d\n", err
);
1893 mutex_lock(&mdsc
->mutex
);
1895 /* only abort if we didn't race with a real reply */
1896 if (req
->r_got_result
) {
1897 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
1898 } else if (err
< 0) {
1899 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
1902 * ensure we aren't running concurrently with
1903 * ceph_fill_trace or ceph_readdir_prepopulate, which
1904 * rely on locks (dir mutex) held by our caller.
1906 mutex_lock(&req
->r_fill_mutex
);
1908 req
->r_aborted
= true;
1909 mutex_unlock(&req
->r_fill_mutex
);
1911 if (req
->r_locked_dir
&&
1912 (req
->r_op
& CEPH_MDS_OP_WRITE
))
1913 ceph_invalidate_dir_request(req
);
1919 mutex_unlock(&mdsc
->mutex
);
1920 dout("do_request %p done, result %d\n", req
, err
);
1925 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
1926 * namespace request.
1928 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
1930 struct inode
*inode
= req
->r_locked_dir
;
1931 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1933 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode
);
1934 spin_lock(&inode
->i_lock
);
1935 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1936 ci
->i_release_count
++;
1937 spin_unlock(&inode
->i_lock
);
1940 ceph_invalidate_dentry_lease(req
->r_dentry
);
1941 if (req
->r_old_dentry
)
1942 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
1948 * We take the session mutex and parse and process the reply immediately.
1949 * This preserves the logical ordering of replies, capabilities, etc., sent
1950 * by the MDS as they are applied to our local cache.
1952 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
1954 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
1955 struct ceph_mds_request
*req
;
1956 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
1957 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
1960 int mds
= session
->s_mds
;
1962 if (msg
->front
.iov_len
< sizeof(*head
)) {
1963 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
1968 /* get request, session */
1969 tid
= le64_to_cpu(msg
->hdr
.tid
);
1970 mutex_lock(&mdsc
->mutex
);
1971 req
= __lookup_request(mdsc
, tid
);
1973 dout("handle_reply on unknown tid %llu\n", tid
);
1974 mutex_unlock(&mdsc
->mutex
);
1977 dout("handle_reply %p\n", req
);
1979 /* correct session? */
1980 if (req
->r_session
!= session
) {
1981 pr_err("mdsc_handle_reply got %llu on session mds%d"
1982 " not mds%d\n", tid
, session
->s_mds
,
1983 req
->r_session
? req
->r_session
->s_mds
: -1);
1984 mutex_unlock(&mdsc
->mutex
);
1989 if ((req
->r_got_unsafe
&& !head
->safe
) ||
1990 (req
->r_got_safe
&& head
->safe
)) {
1991 pr_warning("got a dup %s reply on %llu from mds%d\n",
1992 head
->safe
? "safe" : "unsafe", tid
, mds
);
1993 mutex_unlock(&mdsc
->mutex
);
1996 if (req
->r_got_safe
&& !head
->safe
) {
1997 pr_warning("got unsafe after safe on %llu from mds%d\n",
1999 mutex_unlock(&mdsc
->mutex
);
2003 result
= le32_to_cpu(head
->result
);
2007 * if we're not talking to the authority, send to them
2008 * if the authority has changed while we weren't looking,
2009 * send to new authority
2010 * Otherwise we just have to return an ESTALE
2012 if (result
== -ESTALE
) {
2013 dout("got ESTALE on request %llu", req
->r_tid
);
2014 if (!req
->r_inode
) {
2015 /* do nothing; not an authority problem */
2016 } else if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2017 dout("not using auth, setting for that now");
2018 req
->r_direct_mode
= USE_AUTH_MDS
;
2019 __do_request(mdsc
, req
);
2020 mutex_unlock(&mdsc
->mutex
);
2023 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
2024 struct ceph_cap
*cap
=
2025 ceph_get_cap_for_mds(ci
, req
->r_mds
);;
2027 dout("already using auth");
2028 if ((!cap
|| cap
!= ci
->i_auth_cap
) ||
2029 (cap
->mseq
!= req
->r_sent_on_mseq
)) {
2030 dout("but cap changed, so resending");
2031 __do_request(mdsc
, req
);
2032 mutex_unlock(&mdsc
->mutex
);
2036 dout("have to return ESTALE on request %llu", req
->r_tid
);
2041 req
->r_got_safe
= true;
2042 __unregister_request(mdsc
, req
);
2043 complete_all(&req
->r_safe_completion
);
2045 if (req
->r_got_unsafe
) {
2047 * We already handled the unsafe response, now do the
2048 * cleanup. No need to examine the response; the MDS
2049 * doesn't include any result info in the safe
2050 * response. And even if it did, there is nothing
2051 * useful we could do with a revised return value.
2053 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2054 list_del_init(&req
->r_unsafe_item
);
2056 /* last unsafe request during umount? */
2057 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2058 complete_all(&mdsc
->safe_umount_waiters
);
2059 mutex_unlock(&mdsc
->mutex
);
2063 req
->r_got_unsafe
= true;
2064 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2067 dout("handle_reply tid %lld result %d\n", tid
, result
);
2068 rinfo
= &req
->r_reply_info
;
2069 err
= parse_reply_info(msg
, rinfo
);
2070 mutex_unlock(&mdsc
->mutex
);
2072 mutex_lock(&session
->s_mutex
);
2074 pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds
);
2080 if (rinfo
->snapblob_len
) {
2081 down_write(&mdsc
->snap_rwsem
);
2082 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2083 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2084 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
2085 downgrade_write(&mdsc
->snap_rwsem
);
2087 down_read(&mdsc
->snap_rwsem
);
2090 /* insert trace into our cache */
2091 mutex_lock(&req
->r_fill_mutex
);
2092 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2094 if (result
== 0 && rinfo
->dir_nr
)
2095 ceph_readdir_prepopulate(req
, req
->r_session
);
2096 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2098 mutex_unlock(&req
->r_fill_mutex
);
2100 up_read(&mdsc
->snap_rwsem
);
2102 mutex_lock(&mdsc
->mutex
);
2103 if (!req
->r_aborted
) {
2109 req
->r_got_result
= true;
2112 dout("reply arrived after request %lld was aborted\n", tid
);
2114 mutex_unlock(&mdsc
->mutex
);
2116 ceph_add_cap_releases(mdsc
, req
->r_session
);
2117 mutex_unlock(&session
->s_mutex
);
2119 /* kick calling process */
2120 complete_request(mdsc
, req
);
2122 ceph_mdsc_put_request(req
);
2129 * handle mds notification that our request has been forwarded.
2131 static void handle_forward(struct ceph_mds_client
*mdsc
,
2132 struct ceph_mds_session
*session
,
2133 struct ceph_msg
*msg
)
2135 struct ceph_mds_request
*req
;
2136 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2140 void *p
= msg
->front
.iov_base
;
2141 void *end
= p
+ msg
->front
.iov_len
;
2143 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2144 next_mds
= ceph_decode_32(&p
);
2145 fwd_seq
= ceph_decode_32(&p
);
2147 mutex_lock(&mdsc
->mutex
);
2148 req
= __lookup_request(mdsc
, tid
);
2150 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2151 goto out
; /* dup reply? */
2154 if (req
->r_aborted
) {
2155 dout("forward tid %llu aborted, unregistering\n", tid
);
2156 __unregister_request(mdsc
, req
);
2157 } else if (fwd_seq
<= req
->r_num_fwd
) {
2158 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2159 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2161 /* resend. forward race not possible; mds would drop */
2162 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2164 BUG_ON(req
->r_got_result
);
2165 req
->r_num_fwd
= fwd_seq
;
2166 req
->r_resend_mds
= next_mds
;
2167 put_request_session(req
);
2168 __do_request(mdsc
, req
);
2170 ceph_mdsc_put_request(req
);
2172 mutex_unlock(&mdsc
->mutex
);
2176 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2180 * handle a mds session control message
2182 static void handle_session(struct ceph_mds_session
*session
,
2183 struct ceph_msg
*msg
)
2185 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2188 int mds
= session
->s_mds
;
2189 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2193 if (msg
->front
.iov_len
!= sizeof(*h
))
2195 op
= le32_to_cpu(h
->op
);
2196 seq
= le64_to_cpu(h
->seq
);
2198 mutex_lock(&mdsc
->mutex
);
2199 if (op
== CEPH_SESSION_CLOSE
)
2200 __unregister_session(mdsc
, session
);
2201 /* FIXME: this ttl calculation is generous */
2202 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2203 mutex_unlock(&mdsc
->mutex
);
2205 mutex_lock(&session
->s_mutex
);
2207 dout("handle_session mds%d %s %p state %s seq %llu\n",
2208 mds
, ceph_session_op_name(op
), session
,
2209 session_state_name(session
->s_state
), seq
);
2211 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2212 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2213 pr_info("mds%d came back\n", session
->s_mds
);
2217 case CEPH_SESSION_OPEN
:
2218 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2219 pr_info("mds%d reconnect success\n", session
->s_mds
);
2220 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2221 renewed_caps(mdsc
, session
, 0);
2224 __close_session(mdsc
, session
);
2227 case CEPH_SESSION_RENEWCAPS
:
2228 if (session
->s_renew_seq
== seq
)
2229 renewed_caps(mdsc
, session
, 1);
2232 case CEPH_SESSION_CLOSE
:
2233 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2234 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2235 remove_session_caps(session
);
2236 wake
= 1; /* for good measure */
2237 wake_up_all(&mdsc
->session_close_wq
);
2238 kick_requests(mdsc
, mds
);
2241 case CEPH_SESSION_STALE
:
2242 pr_info("mds%d caps went stale, renewing\n",
2244 spin_lock(&session
->s_cap_lock
);
2245 session
->s_cap_gen
++;
2246 session
->s_cap_ttl
= 0;
2247 spin_unlock(&session
->s_cap_lock
);
2248 send_renew_caps(mdsc
, session
);
2251 case CEPH_SESSION_RECALL_STATE
:
2252 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2256 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2260 mutex_unlock(&session
->s_mutex
);
2262 mutex_lock(&mdsc
->mutex
);
2263 __wake_requests(mdsc
, &session
->s_waiting
);
2264 mutex_unlock(&mdsc
->mutex
);
2269 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2270 (int)msg
->front
.iov_len
);
2277 * called under session->mutex.
2279 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2280 struct ceph_mds_session
*session
)
2282 struct ceph_mds_request
*req
, *nreq
;
2285 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2287 mutex_lock(&mdsc
->mutex
);
2288 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2289 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2291 ceph_msg_get(req
->r_request
);
2292 ceph_con_send(&session
->s_con
, req
->r_request
);
2295 mutex_unlock(&mdsc
->mutex
);
2299 * Encode information about a cap for a reconnect with the MDS.
2301 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2305 struct ceph_mds_cap_reconnect v2
;
2306 struct ceph_mds_cap_reconnect_v1 v1
;
2309 struct ceph_inode_info
*ci
;
2310 struct ceph_reconnect_state
*recon_state
= arg
;
2311 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2315 struct dentry
*dentry
;
2319 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2320 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2321 ceph_cap_string(cap
->issued
));
2322 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2326 dentry
= d_find_alias(inode
);
2328 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2330 err
= PTR_ERR(path
);
2337 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2341 spin_lock(&inode
->i_lock
);
2342 cap
->seq
= 0; /* reset cap seq */
2343 cap
->issue_seq
= 0; /* and issue_seq */
2345 if (recon_state
->flock
) {
2346 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2347 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2348 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2349 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2350 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2351 rec
.v2
.flock_len
= 0;
2352 reclen
= sizeof(rec
.v2
);
2354 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2355 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2356 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2357 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2358 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2359 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2360 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2361 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2362 reclen
= sizeof(rec
.v1
);
2364 spin_unlock(&inode
->i_lock
);
2366 if (recon_state
->flock
) {
2367 int num_fcntl_locks
, num_flock_locks
;
2368 struct ceph_pagelist_cursor trunc_point
;
2370 ceph_pagelist_set_cursor(pagelist
, &trunc_point
);
2373 ceph_count_locks(inode
, &num_fcntl_locks
,
2375 rec
.v2
.flock_len
= (2*sizeof(u32
) +
2376 (num_fcntl_locks
+num_flock_locks
) *
2377 sizeof(struct ceph_filelock
));
2380 /* pre-alloc pagelist */
2381 ceph_pagelist_truncate(pagelist
, &trunc_point
);
2382 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2384 err
= ceph_pagelist_reserve(pagelist
,
2390 err
= ceph_encode_locks(inode
,
2396 } while (err
== -ENOSPC
);
2398 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2410 * If an MDS fails and recovers, clients need to reconnect in order to
2411 * reestablish shared state. This includes all caps issued through
2412 * this session _and_ the snap_realm hierarchy. Because it's not
2413 * clear which snap realms the mds cares about, we send everything we
2414 * know about.. that ensures we'll then get any new info the
2415 * recovering MDS might have.
2417 * This is a relatively heavyweight operation, but it's rare.
2419 * called with mdsc->mutex held.
2421 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2422 struct ceph_mds_session
*session
)
2424 struct ceph_msg
*reply
;
2426 int mds
= session
->s_mds
;
2428 struct ceph_pagelist
*pagelist
;
2429 struct ceph_reconnect_state recon_state
;
2431 pr_info("mds%d reconnect start\n", mds
);
2433 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2435 goto fail_nopagelist
;
2436 ceph_pagelist_init(pagelist
);
2438 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
);
2442 mutex_lock(&session
->s_mutex
);
2443 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2446 ceph_con_open(&session
->s_con
,
2447 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2449 /* replay unsafe requests */
2450 replay_unsafe_requests(mdsc
, session
);
2452 down_read(&mdsc
->snap_rwsem
);
2454 dout("session %p state %s\n", session
,
2455 session_state_name(session
->s_state
));
2457 /* drop old cap expires; we're about to reestablish that state */
2458 discard_cap_releases(mdsc
, session
);
2460 /* traverse this session's caps */
2461 err
= ceph_pagelist_encode_32(pagelist
, session
->s_nr_caps
);
2465 recon_state
.pagelist
= pagelist
;
2466 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2467 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2472 * snaprealms. we provide mds with the ino, seq (version), and
2473 * parent for all of our realms. If the mds has any newer info,
2476 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2477 struct ceph_snap_realm
*realm
=
2478 rb_entry(p
, struct ceph_snap_realm
, node
);
2479 struct ceph_mds_snaprealm_reconnect sr_rec
;
2481 dout(" adding snap realm %llx seq %lld parent %llx\n",
2482 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2483 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2484 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2485 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2486 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2491 reply
->pagelist
= pagelist
;
2492 if (recon_state
.flock
)
2493 reply
->hdr
.version
= cpu_to_le16(2);
2494 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2495 reply
->nr_pages
= calc_pages_for(0, pagelist
->length
);
2496 ceph_con_send(&session
->s_con
, reply
);
2498 mutex_unlock(&session
->s_mutex
);
2500 mutex_lock(&mdsc
->mutex
);
2501 __wake_requests(mdsc
, &session
->s_waiting
);
2502 mutex_unlock(&mdsc
->mutex
);
2504 up_read(&mdsc
->snap_rwsem
);
2508 ceph_msg_put(reply
);
2509 up_read(&mdsc
->snap_rwsem
);
2510 mutex_unlock(&session
->s_mutex
);
2512 ceph_pagelist_release(pagelist
);
2515 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2521 * compare old and new mdsmaps, kicking requests
2522 * and closing out old connections as necessary
2524 * called under mdsc->mutex.
2526 static void check_new_map(struct ceph_mds_client
*mdsc
,
2527 struct ceph_mdsmap
*newmap
,
2528 struct ceph_mdsmap
*oldmap
)
2531 int oldstate
, newstate
;
2532 struct ceph_mds_session
*s
;
2534 dout("check_new_map new %u old %u\n",
2535 newmap
->m_epoch
, oldmap
->m_epoch
);
2537 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2538 if (mdsc
->sessions
[i
] == NULL
)
2540 s
= mdsc
->sessions
[i
];
2541 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2542 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2544 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2545 i
, ceph_mds_state_name(oldstate
),
2546 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
2547 ceph_mds_state_name(newstate
),
2548 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
2549 session_state_name(s
->s_state
));
2551 if (memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2552 ceph_mdsmap_get_addr(newmap
, i
),
2553 sizeof(struct ceph_entity_addr
))) {
2554 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2555 /* the session never opened, just close it
2557 __wake_requests(mdsc
, &s
->s_waiting
);
2558 __unregister_session(mdsc
, s
);
2561 mutex_unlock(&mdsc
->mutex
);
2562 mutex_lock(&s
->s_mutex
);
2563 mutex_lock(&mdsc
->mutex
);
2564 ceph_con_close(&s
->s_con
);
2565 mutex_unlock(&s
->s_mutex
);
2566 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2569 /* kick any requests waiting on the recovering mds */
2570 kick_requests(mdsc
, i
);
2571 } else if (oldstate
== newstate
) {
2572 continue; /* nothing new with this mds */
2578 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2579 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
2580 mutex_unlock(&mdsc
->mutex
);
2581 send_mds_reconnect(mdsc
, s
);
2582 mutex_lock(&mdsc
->mutex
);
2586 * kick request on any mds that has gone active.
2588 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2589 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2590 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
2591 oldstate
!= CEPH_MDS_STATE_STARTING
)
2592 pr_info("mds%d recovery completed\n", s
->s_mds
);
2593 kick_requests(mdsc
, i
);
2594 ceph_kick_flushing_caps(mdsc
, s
);
2595 wake_up_session_caps(s
, 1);
2599 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2600 s
= mdsc
->sessions
[i
];
2603 if (!ceph_mdsmap_is_laggy(newmap
, i
))
2605 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2606 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
2607 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2608 dout(" connecting to export targets of laggy mds%d\n",
2610 __open_export_target_sessions(mdsc
, s
);
2622 * caller must hold session s_mutex, dentry->d_lock
2624 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2626 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2628 ceph_put_mds_session(di
->lease_session
);
2629 di
->lease_session
= NULL
;
2632 static void handle_lease(struct ceph_mds_client
*mdsc
,
2633 struct ceph_mds_session
*session
,
2634 struct ceph_msg
*msg
)
2636 struct super_block
*sb
= mdsc
->fsc
->sb
;
2637 struct inode
*inode
;
2638 struct ceph_inode_info
*ci
;
2639 struct dentry
*parent
, *dentry
;
2640 struct ceph_dentry_info
*di
;
2641 int mds
= session
->s_mds
;
2642 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2644 struct ceph_vino vino
;
2649 dout("handle_lease from mds%d\n", mds
);
2652 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2654 vino
.ino
= le64_to_cpu(h
->ino
);
2655 vino
.snap
= CEPH_NOSNAP
;
2656 mask
= le16_to_cpu(h
->mask
);
2657 seq
= le32_to_cpu(h
->seq
);
2658 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2659 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2660 if (dname
.len
!= get_unaligned_le32(h
+1))
2663 mutex_lock(&session
->s_mutex
);
2667 inode
= ceph_find_inode(sb
, vino
);
2668 dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
2669 ceph_lease_op_name(h
->action
), mask
, vino
.ino
, inode
,
2670 dname
.len
, dname
.name
);
2671 if (inode
== NULL
) {
2672 dout("handle_lease no inode %llx\n", vino
.ino
);
2675 ci
= ceph_inode(inode
);
2678 parent
= d_find_alias(inode
);
2680 dout("no parent dentry on inode %p\n", inode
);
2682 goto release
; /* hrm... */
2684 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2685 dentry
= d_lookup(parent
, &dname
);
2690 spin_lock(&dentry
->d_lock
);
2691 di
= ceph_dentry(dentry
);
2692 switch (h
->action
) {
2693 case CEPH_MDS_LEASE_REVOKE
:
2694 if (di
&& di
->lease_session
== session
) {
2695 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
2696 h
->seq
= cpu_to_le32(di
->lease_seq
);
2697 __ceph_mdsc_drop_dentry_lease(dentry
);
2702 case CEPH_MDS_LEASE_RENEW
:
2703 if (di
&& di
->lease_session
== session
&&
2704 di
->lease_gen
== session
->s_cap_gen
&&
2705 di
->lease_renew_from
&&
2706 di
->lease_renew_after
== 0) {
2707 unsigned long duration
=
2708 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2710 di
->lease_seq
= seq
;
2711 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2712 di
->lease_renew_after
= di
->lease_renew_from
+
2714 di
->lease_renew_from
= 0;
2718 spin_unlock(&dentry
->d_lock
);
2725 /* let's just reuse the same message */
2726 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2728 ceph_con_send(&session
->s_con
, msg
);
2732 mutex_unlock(&session
->s_mutex
);
2736 pr_err("corrupt lease message\n");
2740 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
2741 struct inode
*inode
,
2742 struct dentry
*dentry
, char action
,
2745 struct ceph_msg
*msg
;
2746 struct ceph_mds_lease
*lease
;
2747 int len
= sizeof(*lease
) + sizeof(u32
);
2750 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2751 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
2752 dnamelen
= dentry
->d_name
.len
;
2755 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
);
2758 lease
= msg
->front
.iov_base
;
2759 lease
->action
= action
;
2760 lease
->mask
= cpu_to_le16(1);
2761 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
2762 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
2763 lease
->seq
= cpu_to_le32(seq
);
2764 put_unaligned_le32(dnamelen
, lease
+ 1);
2765 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
2768 * if this is a preemptive lease RELEASE, no need to
2769 * flush request stream, since the actual request will
2772 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
2774 ceph_con_send(&session
->s_con
, msg
);
2778 * Preemptively release a lease we expect to invalidate anyway.
2779 * Pass @inode always, @dentry is optional.
2781 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
2782 struct dentry
*dentry
, int mask
)
2784 struct ceph_dentry_info
*di
;
2785 struct ceph_mds_session
*session
;
2788 BUG_ON(inode
== NULL
);
2789 BUG_ON(dentry
== NULL
);
2792 /* is dentry lease valid? */
2793 spin_lock(&dentry
->d_lock
);
2794 di
= ceph_dentry(dentry
);
2795 if (!di
|| !di
->lease_session
||
2796 di
->lease_session
->s_mds
< 0 ||
2797 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
2798 !time_before(jiffies
, dentry
->d_time
)) {
2799 dout("lease_release inode %p dentry %p -- "
2801 inode
, dentry
, mask
);
2802 spin_unlock(&dentry
->d_lock
);
2806 /* we do have a lease on this dentry; note mds and seq */
2807 session
= ceph_get_mds_session(di
->lease_session
);
2808 seq
= di
->lease_seq
;
2809 __ceph_mdsc_drop_dentry_lease(dentry
);
2810 spin_unlock(&dentry
->d_lock
);
2812 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2813 inode
, dentry
, mask
, session
->s_mds
);
2814 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
2815 CEPH_MDS_LEASE_RELEASE
, seq
);
2816 ceph_put_mds_session(session
);
2820 * drop all leases (and dentry refs) in preparation for umount
2822 static void drop_leases(struct ceph_mds_client
*mdsc
)
2826 dout("drop_leases\n");
2827 mutex_lock(&mdsc
->mutex
);
2828 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2829 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2832 mutex_unlock(&mdsc
->mutex
);
2833 mutex_lock(&s
->s_mutex
);
2834 mutex_unlock(&s
->s_mutex
);
2835 ceph_put_mds_session(s
);
2836 mutex_lock(&mdsc
->mutex
);
2838 mutex_unlock(&mdsc
->mutex
);
2844 * delayed work -- periodically trim expired leases, renew caps with mds
2846 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
2849 unsigned hz
= round_jiffies_relative(HZ
* delay
);
2850 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
2853 static void delayed_work(struct work_struct
*work
)
2856 struct ceph_mds_client
*mdsc
=
2857 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
2861 dout("mdsc delayed_work\n");
2862 ceph_check_delayed_caps(mdsc
);
2864 mutex_lock(&mdsc
->mutex
);
2865 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
2866 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
2867 mdsc
->last_renew_caps
);
2869 mdsc
->last_renew_caps
= jiffies
;
2871 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2872 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2875 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2876 dout("resending session close request for mds%d\n",
2878 request_close_session(mdsc
, s
);
2879 ceph_put_mds_session(s
);
2882 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
2883 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
2884 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
2885 pr_info("mds%d hung\n", s
->s_mds
);
2888 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
2889 /* this mds is failed or recovering, just wait */
2890 ceph_put_mds_session(s
);
2893 mutex_unlock(&mdsc
->mutex
);
2895 mutex_lock(&s
->s_mutex
);
2897 send_renew_caps(mdsc
, s
);
2899 ceph_con_keepalive(&s
->s_con
);
2900 ceph_add_cap_releases(mdsc
, s
);
2901 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2902 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
2903 ceph_send_cap_releases(mdsc
, s
);
2904 mutex_unlock(&s
->s_mutex
);
2905 ceph_put_mds_session(s
);
2907 mutex_lock(&mdsc
->mutex
);
2909 mutex_unlock(&mdsc
->mutex
);
2911 schedule_delayed(mdsc
);
2914 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
2917 struct ceph_mds_client
*mdsc
;
2919 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
2924 mutex_init(&mdsc
->mutex
);
2925 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
2926 if (mdsc
->mdsmap
== NULL
)
2929 init_completion(&mdsc
->safe_umount_waiters
);
2930 init_waitqueue_head(&mdsc
->session_close_wq
);
2931 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
2932 mdsc
->sessions
= NULL
;
2933 mdsc
->max_sessions
= 0;
2935 init_rwsem(&mdsc
->snap_rwsem
);
2936 mdsc
->snap_realms
= RB_ROOT
;
2937 INIT_LIST_HEAD(&mdsc
->snap_empty
);
2938 spin_lock_init(&mdsc
->snap_empty_lock
);
2940 mdsc
->request_tree
= RB_ROOT
;
2941 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
2942 mdsc
->last_renew_caps
= jiffies
;
2943 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
2944 spin_lock_init(&mdsc
->cap_delay_lock
);
2945 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
2946 spin_lock_init(&mdsc
->snap_flush_lock
);
2947 mdsc
->cap_flush_seq
= 0;
2948 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
2949 mdsc
->num_cap_flushing
= 0;
2950 spin_lock_init(&mdsc
->cap_dirty_lock
);
2951 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
2952 spin_lock_init(&mdsc
->dentry_lru_lock
);
2953 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
2955 ceph_caps_init(mdsc
);
2956 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
2962 * Wait for safe replies on open mds requests. If we time out, drop
2963 * all requests from the tree to avoid dangling dentry refs.
2965 static void wait_requests(struct ceph_mds_client
*mdsc
)
2967 struct ceph_mds_request
*req
;
2968 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
2970 mutex_lock(&mdsc
->mutex
);
2971 if (__get_oldest_req(mdsc
)) {
2972 mutex_unlock(&mdsc
->mutex
);
2974 dout("wait_requests waiting for requests\n");
2975 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
2976 fsc
->client
->options
->mount_timeout
* HZ
);
2978 /* tear down remaining requests */
2979 mutex_lock(&mdsc
->mutex
);
2980 while ((req
= __get_oldest_req(mdsc
))) {
2981 dout("wait_requests timed out on tid %llu\n",
2983 __unregister_request(mdsc
, req
);
2986 mutex_unlock(&mdsc
->mutex
);
2987 dout("wait_requests done\n");
2991 * called before mount is ro, and before dentries are torn down.
2992 * (hmm, does this still race with new lookups?)
2994 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
2996 dout("pre_umount\n");
3000 ceph_flush_dirty_caps(mdsc
);
3001 wait_requests(mdsc
);
3004 * wait for reply handlers to drop their request refs and
3005 * their inode/dcache refs
3011 * wait for all write mds requests to flush.
3013 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3015 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3018 mutex_lock(&mdsc
->mutex
);
3019 dout("wait_unsafe_requests want %lld\n", want_tid
);
3021 req
= __get_oldest_req(mdsc
);
3022 while (req
&& req
->r_tid
<= want_tid
) {
3023 /* find next request */
3024 n
= rb_next(&req
->r_node
);
3026 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3029 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3031 ceph_mdsc_get_request(req
);
3033 ceph_mdsc_get_request(nextreq
);
3034 mutex_unlock(&mdsc
->mutex
);
3035 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3036 req
->r_tid
, want_tid
);
3037 wait_for_completion(&req
->r_safe_completion
);
3038 mutex_lock(&mdsc
->mutex
);
3039 ceph_mdsc_put_request(req
);
3041 break; /* next dne before, so we're done! */
3042 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3043 /* next request was removed from tree */
3044 ceph_mdsc_put_request(nextreq
);
3047 ceph_mdsc_put_request(nextreq
); /* won't go away */
3051 mutex_unlock(&mdsc
->mutex
);
3052 dout("wait_unsafe_requests done\n");
3055 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3057 u64 want_tid
, want_flush
;
3059 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3063 mutex_lock(&mdsc
->mutex
);
3064 want_tid
= mdsc
->last_tid
;
3065 want_flush
= mdsc
->cap_flush_seq
;
3066 mutex_unlock(&mdsc
->mutex
);
3067 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3069 ceph_flush_dirty_caps(mdsc
);
3071 wait_unsafe_requests(mdsc
, want_tid
);
3072 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
3076 * true if all sessions are closed, or we force unmount
3078 bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3082 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3085 mutex_lock(&mdsc
->mutex
);
3086 for (i
= 0; i
< mdsc
->max_sessions
; i
++)
3087 if (mdsc
->sessions
[i
])
3089 mutex_unlock(&mdsc
->mutex
);
3094 * called after sb is ro.
3096 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3098 struct ceph_mds_session
*session
;
3100 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3101 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3103 dout("close_sessions\n");
3105 /* close sessions */
3106 mutex_lock(&mdsc
->mutex
);
3107 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3108 session
= __ceph_lookup_mds_session(mdsc
, i
);
3111 mutex_unlock(&mdsc
->mutex
);
3112 mutex_lock(&session
->s_mutex
);
3113 __close_session(mdsc
, session
);
3114 mutex_unlock(&session
->s_mutex
);
3115 ceph_put_mds_session(session
);
3116 mutex_lock(&mdsc
->mutex
);
3118 mutex_unlock(&mdsc
->mutex
);
3120 dout("waiting for sessions to close\n");
3121 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3124 /* tear down remaining sessions */
3125 mutex_lock(&mdsc
->mutex
);
3126 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3127 if (mdsc
->sessions
[i
]) {
3128 session
= get_session(mdsc
->sessions
[i
]);
3129 __unregister_session(mdsc
, session
);
3130 mutex_unlock(&mdsc
->mutex
);
3131 mutex_lock(&session
->s_mutex
);
3132 remove_session_caps(session
);
3133 mutex_unlock(&session
->s_mutex
);
3134 ceph_put_mds_session(session
);
3135 mutex_lock(&mdsc
->mutex
);
3138 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3139 mutex_unlock(&mdsc
->mutex
);
3141 ceph_cleanup_empty_realms(mdsc
);
3143 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3148 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3151 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3153 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3154 kfree(mdsc
->sessions
);
3155 ceph_caps_finalize(mdsc
);
3158 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3160 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3162 ceph_mdsc_stop(mdsc
);
3169 * handle mds map update.
3171 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3175 void *p
= msg
->front
.iov_base
;
3176 void *end
= p
+ msg
->front
.iov_len
;
3177 struct ceph_mdsmap
*newmap
, *oldmap
;
3178 struct ceph_fsid fsid
;
3181 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3182 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3183 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3185 epoch
= ceph_decode_32(&p
);
3186 maplen
= ceph_decode_32(&p
);
3187 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3189 /* do we need it? */
3190 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3191 mutex_lock(&mdsc
->mutex
);
3192 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3193 dout("handle_map epoch %u <= our %u\n",
3194 epoch
, mdsc
->mdsmap
->m_epoch
);
3195 mutex_unlock(&mdsc
->mutex
);
3199 newmap
= ceph_mdsmap_decode(&p
, end
);
3200 if (IS_ERR(newmap
)) {
3201 err
= PTR_ERR(newmap
);
3205 /* swap into place */
3207 oldmap
= mdsc
->mdsmap
;
3208 mdsc
->mdsmap
= newmap
;
3209 check_new_map(mdsc
, newmap
, oldmap
);
3210 ceph_mdsmap_destroy(oldmap
);
3212 mdsc
->mdsmap
= newmap
; /* first mds map */
3214 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3216 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3218 mutex_unlock(&mdsc
->mutex
);
3219 schedule_delayed(mdsc
);
3223 mutex_unlock(&mdsc
->mutex
);
3225 pr_err("error decoding mdsmap %d\n", err
);
3229 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3231 struct ceph_mds_session
*s
= con
->private;
3233 if (get_session(s
)) {
3234 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3237 dout("mdsc con_get %p FAIL\n", s
);
3241 static void con_put(struct ceph_connection
*con
)
3243 struct ceph_mds_session
*s
= con
->private;
3245 ceph_put_mds_session(s
);
3246 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
));
3250 * if the client is unresponsive for long enough, the mds will kill
3251 * the session entirely.
3253 static void peer_reset(struct ceph_connection
*con
)
3255 struct ceph_mds_session
*s
= con
->private;
3256 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3258 pr_warning("mds%d closed our session\n", s
->s_mds
);
3259 send_mds_reconnect(mdsc
, s
);
3262 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3264 struct ceph_mds_session
*s
= con
->private;
3265 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3266 int type
= le16_to_cpu(msg
->hdr
.type
);
3268 mutex_lock(&mdsc
->mutex
);
3269 if (__verify_registered_session(mdsc
, s
) < 0) {
3270 mutex_unlock(&mdsc
->mutex
);
3273 mutex_unlock(&mdsc
->mutex
);
3276 case CEPH_MSG_MDS_MAP
:
3277 ceph_mdsc_handle_map(mdsc
, msg
);
3279 case CEPH_MSG_CLIENT_SESSION
:
3280 handle_session(s
, msg
);
3282 case CEPH_MSG_CLIENT_REPLY
:
3283 handle_reply(s
, msg
);
3285 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3286 handle_forward(mdsc
, s
, msg
);
3288 case CEPH_MSG_CLIENT_CAPS
:
3289 ceph_handle_caps(s
, msg
);
3291 case CEPH_MSG_CLIENT_SNAP
:
3292 ceph_handle_snap(mdsc
, s
, msg
);
3294 case CEPH_MSG_CLIENT_LEASE
:
3295 handle_lease(mdsc
, s
, msg
);
3299 pr_err("received unknown message type %d %s\n", type
,
3300 ceph_msg_type_name(type
));
3309 static int get_authorizer(struct ceph_connection
*con
,
3310 void **buf
, int *len
, int *proto
,
3311 void **reply_buf
, int *reply_len
, int force_new
)
3313 struct ceph_mds_session
*s
= con
->private;
3314 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3315 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3318 if (force_new
&& s
->s_authorizer
) {
3319 ac
->ops
->destroy_authorizer(ac
, s
->s_authorizer
);
3320 s
->s_authorizer
= NULL
;
3322 if (s
->s_authorizer
== NULL
) {
3323 if (ac
->ops
->create_authorizer
) {
3324 ret
= ac
->ops
->create_authorizer(
3325 ac
, CEPH_ENTITY_TYPE_MDS
,
3327 &s
->s_authorizer_buf
,
3328 &s
->s_authorizer_buf_len
,
3329 &s
->s_authorizer_reply_buf
,
3330 &s
->s_authorizer_reply_buf_len
);
3336 *proto
= ac
->protocol
;
3337 *buf
= s
->s_authorizer_buf
;
3338 *len
= s
->s_authorizer_buf_len
;
3339 *reply_buf
= s
->s_authorizer_reply_buf
;
3340 *reply_len
= s
->s_authorizer_reply_buf_len
;
3345 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3347 struct ceph_mds_session
*s
= con
->private;
3348 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3349 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3351 return ac
->ops
->verify_authorizer_reply(ac
, s
->s_authorizer
, len
);
3354 static int invalidate_authorizer(struct ceph_connection
*con
)
3356 struct ceph_mds_session
*s
= con
->private;
3357 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3358 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3360 if (ac
->ops
->invalidate_authorizer
)
3361 ac
->ops
->invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3363 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3366 static const struct ceph_connection_operations mds_con_ops
= {
3369 .dispatch
= dispatch
,
3370 .get_authorizer
= get_authorizer
,
3371 .verify_authorizer_reply
= verify_authorizer_reply
,
3372 .invalidate_authorizer
= invalidate_authorizer
,
3373 .peer_reset
= peer_reset
,