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41 * are no longer valid.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
);
531 req
->r_uid
= current_fsuid();
532 req
->r_gid
= current_fsgid();
535 struct ceph_inode_info
*ci
= ceph_inode(dir
);
537 spin_lock(&ci
->i_unsafe_lock
);
538 req
->r_unsafe_dir
= dir
;
539 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
540 spin_unlock(&ci
->i_unsafe_lock
);
544 static void __unregister_request(struct ceph_mds_client
*mdsc
,
545 struct ceph_mds_request
*req
)
547 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
548 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
549 RB_CLEAR_NODE(&req
->r_node
);
551 if (req
->r_unsafe_dir
) {
552 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
554 spin_lock(&ci
->i_unsafe_lock
);
555 list_del_init(&req
->r_unsafe_dir_item
);
556 spin_unlock(&ci
->i_unsafe_lock
);
559 ceph_mdsc_put_request(req
);
563 * Choose mds to send request to next. If there is a hint set in the
564 * request (e.g., due to a prior forward hint from the mds), use that.
565 * Otherwise, consult frag tree and/or caps to identify the
566 * appropriate mds. If all else fails, choose randomly.
568 * Called under mdsc->mutex.
570 struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
572 while (!IS_ROOT(dentry
) && ceph_snap(dentry
->d_inode
) != CEPH_NOSNAP
)
573 dentry
= dentry
->d_parent
;
577 static int __choose_mds(struct ceph_mds_client
*mdsc
,
578 struct ceph_mds_request
*req
)
581 struct ceph_inode_info
*ci
;
582 struct ceph_cap
*cap
;
583 int mode
= req
->r_direct_mode
;
585 u32 hash
= req
->r_direct_hash
;
586 bool is_hash
= req
->r_direct_is_hash
;
589 * is there a specific mds we should try? ignore hint if we have
590 * no session and the mds is not up (active or recovering).
592 if (req
->r_resend_mds
>= 0 &&
593 (__have_session(mdsc
, req
->r_resend_mds
) ||
594 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
595 dout("choose_mds using resend_mds mds%d\n",
597 return req
->r_resend_mds
;
600 if (mode
== USE_RANDOM_MDS
)
605 inode
= req
->r_inode
;
606 } else if (req
->r_dentry
) {
607 struct inode
*dir
= req
->r_dentry
->d_parent
->d_inode
;
609 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
611 inode
= req
->r_dentry
->d_inode
;
612 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
613 /* direct snapped/virtual snapdir requests
614 * based on parent dir inode */
616 get_nonsnap_parent(req
->r_dentry
->d_parent
);
618 dout("__choose_mds using nonsnap parent %p\n", inode
);
619 } else if (req
->r_dentry
->d_inode
) {
621 inode
= req
->r_dentry
->d_inode
;
625 hash
= req
->r_dentry
->d_name
.hash
;
630 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
634 ci
= ceph_inode(inode
);
636 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
637 struct ceph_inode_frag frag
;
640 ceph_choose_frag(ci
, hash
, &frag
, &found
);
642 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
645 /* choose a random replica */
646 get_random_bytes(&r
, 1);
649 dout("choose_mds %p %llx.%llx "
650 "frag %u mds%d (%d/%d)\n",
651 inode
, ceph_vinop(inode
),
657 /* since this file/dir wasn't known to be
658 * replicated, then we want to look for the
659 * authoritative mds. */
662 /* choose auth mds */
664 dout("choose_mds %p %llx.%llx "
665 "frag %u mds%d (auth)\n",
666 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
672 spin_lock(&inode
->i_lock
);
674 if (mode
== USE_AUTH_MDS
)
675 cap
= ci
->i_auth_cap
;
676 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
677 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
679 spin_unlock(&inode
->i_lock
);
682 mds
= cap
->session
->s_mds
;
683 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
684 inode
, ceph_vinop(inode
), mds
,
685 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
686 spin_unlock(&inode
->i_lock
);
690 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
691 dout("choose_mds chose random mds%d\n", mds
);
699 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
701 struct ceph_msg
*msg
;
702 struct ceph_mds_session_head
*h
;
704 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
);
706 pr_err("create_session_msg ENOMEM creating msg\n");
709 h
= msg
->front
.iov_base
;
710 h
->op
= cpu_to_le32(op
);
711 h
->seq
= cpu_to_le64(seq
);
716 * send session open request.
718 * called under mdsc->mutex
720 static int __open_session(struct ceph_mds_client
*mdsc
,
721 struct ceph_mds_session
*session
)
723 struct ceph_msg
*msg
;
725 int mds
= session
->s_mds
;
727 /* wait for mds to go active? */
728 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
729 dout("open_session to mds%d (%s)\n", mds
,
730 ceph_mds_state_name(mstate
));
731 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
732 session
->s_renew_requested
= jiffies
;
734 /* send connect message */
735 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
738 ceph_con_send(&session
->s_con
, msg
);
743 * open sessions for any export targets for the given mds
745 * called under mdsc->mutex
747 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
748 struct ceph_mds_session
*session
)
750 struct ceph_mds_info
*mi
;
751 struct ceph_mds_session
*ts
;
752 int i
, mds
= session
->s_mds
;
755 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
757 mi
= &mdsc
->mdsmap
->m_info
[mds
];
758 dout("open_export_target_sessions for mds%d (%d targets)\n",
759 session
->s_mds
, mi
->num_export_targets
);
761 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
762 target
= mi
->export_targets
[i
];
763 ts
= __ceph_lookup_mds_session(mdsc
, target
);
765 ts
= register_session(mdsc
, target
);
769 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
770 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
771 __open_session(mdsc
, session
);
773 dout(" mds%d target mds%d %p is %s\n", session
->s_mds
,
774 i
, ts
, session_state_name(ts
->s_state
));
775 ceph_put_mds_session(ts
);
779 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
780 struct ceph_mds_session
*session
)
782 mutex_lock(&mdsc
->mutex
);
783 __open_export_target_sessions(mdsc
, session
);
784 mutex_unlock(&mdsc
->mutex
);
792 * Free preallocated cap messages assigned to this session
794 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
796 struct ceph_msg
*msg
;
798 spin_lock(&session
->s_cap_lock
);
799 while (!list_empty(&session
->s_cap_releases
)) {
800 msg
= list_first_entry(&session
->s_cap_releases
,
801 struct ceph_msg
, list_head
);
802 list_del_init(&msg
->list_head
);
805 while (!list_empty(&session
->s_cap_releases_done
)) {
806 msg
= list_first_entry(&session
->s_cap_releases_done
,
807 struct ceph_msg
, list_head
);
808 list_del_init(&msg
->list_head
);
811 spin_unlock(&session
->s_cap_lock
);
815 * Helper to safely iterate over all caps associated with a session, with
816 * special care taken to handle a racing __ceph_remove_cap().
818 * Caller must hold session s_mutex.
820 static int iterate_session_caps(struct ceph_mds_session
*session
,
821 int (*cb
)(struct inode
*, struct ceph_cap
*,
825 struct ceph_cap
*cap
;
826 struct inode
*inode
, *last_inode
= NULL
;
827 struct ceph_cap
*old_cap
= NULL
;
830 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
831 spin_lock(&session
->s_cap_lock
);
832 p
= session
->s_caps
.next
;
833 while (p
!= &session
->s_caps
) {
834 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
835 inode
= igrab(&cap
->ci
->vfs_inode
);
840 session
->s_cap_iterator
= cap
;
841 spin_unlock(&session
->s_cap_lock
);
848 ceph_put_cap(session
->s_mdsc
, old_cap
);
852 ret
= cb(inode
, cap
, arg
);
855 spin_lock(&session
->s_cap_lock
);
857 if (cap
->ci
== NULL
) {
858 dout("iterate_session_caps finishing cap %p removal\n",
860 BUG_ON(cap
->session
!= session
);
861 list_del_init(&cap
->session_caps
);
862 session
->s_nr_caps
--;
864 old_cap
= cap
; /* put_cap it w/o locks held */
871 session
->s_cap_iterator
= NULL
;
872 spin_unlock(&session
->s_cap_lock
);
877 ceph_put_cap(session
->s_mdsc
, old_cap
);
882 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
885 struct ceph_inode_info
*ci
= ceph_inode(inode
);
888 dout("removing cap %p, ci is %p, inode is %p\n",
889 cap
, ci
, &ci
->vfs_inode
);
890 spin_lock(&inode
->i_lock
);
891 __ceph_remove_cap(cap
);
892 if (!__ceph_is_any_real_caps(ci
)) {
893 struct ceph_mds_client
*mdsc
=
894 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
896 spin_lock(&mdsc
->cap_dirty_lock
);
897 if (!list_empty(&ci
->i_dirty_item
)) {
898 pr_info(" dropping dirty %s state for %p %lld\n",
899 ceph_cap_string(ci
->i_dirty_caps
),
900 inode
, ceph_ino(inode
));
901 ci
->i_dirty_caps
= 0;
902 list_del_init(&ci
->i_dirty_item
);
905 if (!list_empty(&ci
->i_flushing_item
)) {
906 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
907 ceph_cap_string(ci
->i_flushing_caps
),
908 inode
, ceph_ino(inode
));
909 ci
->i_flushing_caps
= 0;
910 list_del_init(&ci
->i_flushing_item
);
911 mdsc
->num_cap_flushing
--;
914 if (drop
&& ci
->i_wrbuffer_ref
) {
915 pr_info(" dropping dirty data for %p %lld\n",
916 inode
, ceph_ino(inode
));
917 ci
->i_wrbuffer_ref
= 0;
918 ci
->i_wrbuffer_ref_head
= 0;
921 spin_unlock(&mdsc
->cap_dirty_lock
);
923 spin_unlock(&inode
->i_lock
);
930 * caller must hold session s_mutex
932 static void remove_session_caps(struct ceph_mds_session
*session
)
934 dout("remove_session_caps on %p\n", session
);
935 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
936 BUG_ON(session
->s_nr_caps
> 0);
937 BUG_ON(!list_empty(&session
->s_cap_flushing
));
938 cleanup_cap_releases(session
);
942 * wake up any threads waiting on this session's caps. if the cap is
943 * old (didn't get renewed on the client reconnect), remove it now.
945 * caller must hold s_mutex.
947 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
950 struct ceph_inode_info
*ci
= ceph_inode(inode
);
952 wake_up_all(&ci
->i_cap_wq
);
954 spin_lock(&inode
->i_lock
);
955 ci
->i_wanted_max_size
= 0;
956 ci
->i_requested_max_size
= 0;
957 spin_unlock(&inode
->i_lock
);
962 static void wake_up_session_caps(struct ceph_mds_session
*session
,
965 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
966 iterate_session_caps(session
, wake_up_session_cb
,
967 (void *)(unsigned long)reconnect
);
971 * Send periodic message to MDS renewing all currently held caps. The
972 * ack will reset the expiration for all caps from this session.
974 * caller holds s_mutex
976 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
977 struct ceph_mds_session
*session
)
979 struct ceph_msg
*msg
;
982 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
983 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
984 pr_info("mds%d caps stale\n", session
->s_mds
);
985 session
->s_renew_requested
= jiffies
;
987 /* do not try to renew caps until a recovering mds has reconnected
988 * with its clients. */
989 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
990 if (state
< CEPH_MDS_STATE_RECONNECT
) {
991 dout("send_renew_caps ignoring mds%d (%s)\n",
992 session
->s_mds
, ceph_mds_state_name(state
));
996 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
997 ceph_mds_state_name(state
));
998 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
999 ++session
->s_renew_seq
);
1002 ceph_con_send(&session
->s_con
, msg
);
1007 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1009 * Called under session->s_mutex
1011 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1012 struct ceph_mds_session
*session
, int is_renew
)
1017 spin_lock(&session
->s_cap_lock
);
1018 was_stale
= is_renew
&& (session
->s_cap_ttl
== 0 ||
1019 time_after_eq(jiffies
, session
->s_cap_ttl
));
1021 session
->s_cap_ttl
= session
->s_renew_requested
+
1022 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1025 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1026 pr_info("mds%d caps renewed\n", session
->s_mds
);
1029 pr_info("mds%d caps still stale\n", session
->s_mds
);
1032 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1033 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1034 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1035 spin_unlock(&session
->s_cap_lock
);
1038 wake_up_session_caps(session
, 0);
1042 * send a session close request
1044 static int request_close_session(struct ceph_mds_client
*mdsc
,
1045 struct ceph_mds_session
*session
)
1047 struct ceph_msg
*msg
;
1049 dout("request_close_session mds%d state %s seq %lld\n",
1050 session
->s_mds
, session_state_name(session
->s_state
),
1052 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1055 ceph_con_send(&session
->s_con
, msg
);
1060 * Called with s_mutex held.
1062 static int __close_session(struct ceph_mds_client
*mdsc
,
1063 struct ceph_mds_session
*session
)
1065 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1067 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1068 return request_close_session(mdsc
, session
);
1072 * Trim old(er) caps.
1074 * Because we can't cache an inode without one or more caps, we do
1075 * this indirectly: if a cap is unused, we prune its aliases, at which
1076 * point the inode will hopefully get dropped to.
1078 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1079 * memory pressure from the MDS, though, so it needn't be perfect.
1081 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1083 struct ceph_mds_session
*session
= arg
;
1084 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1085 int used
, oissued
, mine
;
1087 if (session
->s_trim_caps
<= 0)
1090 spin_lock(&inode
->i_lock
);
1091 mine
= cap
->issued
| cap
->implemented
;
1092 used
= __ceph_caps_used(ci
);
1093 oissued
= __ceph_caps_issued_other(ci
, cap
);
1095 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1096 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1097 ceph_cap_string(used
));
1098 if (ci
->i_dirty_caps
)
1099 goto out
; /* dirty caps */
1100 if ((used
& ~oissued
) & mine
)
1101 goto out
; /* we need these caps */
1103 session
->s_trim_caps
--;
1105 /* we aren't the only cap.. just remove us */
1106 __ceph_remove_cap(cap
);
1108 /* try to drop referring dentries */
1109 spin_unlock(&inode
->i_lock
);
1110 d_prune_aliases(inode
);
1111 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1112 inode
, cap
, atomic_read(&inode
->i_count
));
1117 spin_unlock(&inode
->i_lock
);
1122 * Trim session cap count down to some max number.
1124 static int trim_caps(struct ceph_mds_client
*mdsc
,
1125 struct ceph_mds_session
*session
,
1128 int trim_caps
= session
->s_nr_caps
- max_caps
;
1130 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1131 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1132 if (trim_caps
> 0) {
1133 session
->s_trim_caps
= trim_caps
;
1134 iterate_session_caps(session
, trim_caps_cb
, session
);
1135 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1136 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1137 trim_caps
- session
->s_trim_caps
);
1138 session
->s_trim_caps
= 0;
1144 * Allocate cap_release messages. If there is a partially full message
1145 * in the queue, try to allocate enough to cover it's remainder, so that
1146 * we can send it immediately.
1148 * Called under s_mutex.
1150 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1151 struct ceph_mds_session
*session
)
1153 struct ceph_msg
*msg
, *partial
= NULL
;
1154 struct ceph_mds_cap_release
*head
;
1156 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1159 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1162 spin_lock(&session
->s_cap_lock
);
1164 if (!list_empty(&session
->s_cap_releases
)) {
1165 msg
= list_first_entry(&session
->s_cap_releases
,
1168 head
= msg
->front
.iov_base
;
1169 num
= le32_to_cpu(head
->num
);
1171 dout(" partial %p with (%d/%d)\n", msg
, num
,
1172 (int)CEPH_CAPS_PER_RELEASE
);
1173 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1177 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1178 spin_unlock(&session
->s_cap_lock
);
1179 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1183 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1184 (int)msg
->front
.iov_len
);
1185 head
= msg
->front
.iov_base
;
1186 head
->num
= cpu_to_le32(0);
1187 msg
->front
.iov_len
= sizeof(*head
);
1188 spin_lock(&session
->s_cap_lock
);
1189 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1190 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1194 head
= partial
->front
.iov_base
;
1195 num
= le32_to_cpu(head
->num
);
1196 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1197 (int)CEPH_CAPS_PER_RELEASE
);
1198 list_move_tail(&partial
->list_head
,
1199 &session
->s_cap_releases_done
);
1200 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1203 spin_unlock(&session
->s_cap_lock
);
1209 * flush all dirty inode data to disk.
1211 * returns true if we've flushed through want_flush_seq
1213 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1217 dout("check_cap_flush want %lld\n", want_flush_seq
);
1218 mutex_lock(&mdsc
->mutex
);
1219 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1220 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1224 get_session(session
);
1225 mutex_unlock(&mdsc
->mutex
);
1227 mutex_lock(&session
->s_mutex
);
1228 if (!list_empty(&session
->s_cap_flushing
)) {
1229 struct ceph_inode_info
*ci
=
1230 list_entry(session
->s_cap_flushing
.next
,
1231 struct ceph_inode_info
,
1233 struct inode
*inode
= &ci
->vfs_inode
;
1235 spin_lock(&inode
->i_lock
);
1236 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1237 dout("check_cap_flush still flushing %p "
1238 "seq %lld <= %lld to mds%d\n", inode
,
1239 ci
->i_cap_flush_seq
, want_flush_seq
,
1243 spin_unlock(&inode
->i_lock
);
1245 mutex_unlock(&session
->s_mutex
);
1246 ceph_put_mds_session(session
);
1250 mutex_lock(&mdsc
->mutex
);
1253 mutex_unlock(&mdsc
->mutex
);
1254 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1259 * called under s_mutex
1261 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1262 struct ceph_mds_session
*session
)
1264 struct ceph_msg
*msg
;
1266 dout("send_cap_releases mds%d\n", session
->s_mds
);
1267 spin_lock(&session
->s_cap_lock
);
1268 while (!list_empty(&session
->s_cap_releases_done
)) {
1269 msg
= list_first_entry(&session
->s_cap_releases_done
,
1270 struct ceph_msg
, list_head
);
1271 list_del_init(&msg
->list_head
);
1272 spin_unlock(&session
->s_cap_lock
);
1273 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1274 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1275 ceph_con_send(&session
->s_con
, msg
);
1276 spin_lock(&session
->s_cap_lock
);
1278 spin_unlock(&session
->s_cap_lock
);
1281 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1282 struct ceph_mds_session
*session
)
1284 struct ceph_msg
*msg
;
1285 struct ceph_mds_cap_release
*head
;
1288 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1289 spin_lock(&session
->s_cap_lock
);
1291 /* zero out the in-progress message */
1292 msg
= list_first_entry(&session
->s_cap_releases
,
1293 struct ceph_msg
, list_head
);
1294 head
= msg
->front
.iov_base
;
1295 num
= le32_to_cpu(head
->num
);
1296 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
, num
);
1297 head
->num
= cpu_to_le32(0);
1298 session
->s_num_cap_releases
+= num
;
1300 /* requeue completed messages */
1301 while (!list_empty(&session
->s_cap_releases_done
)) {
1302 msg
= list_first_entry(&session
->s_cap_releases_done
,
1303 struct ceph_msg
, list_head
);
1304 list_del_init(&msg
->list_head
);
1306 head
= msg
->front
.iov_base
;
1307 num
= le32_to_cpu(head
->num
);
1308 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1310 session
->s_num_cap_releases
+= num
;
1311 head
->num
= cpu_to_le32(0);
1312 msg
->front
.iov_len
= sizeof(*head
);
1313 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1316 spin_unlock(&session
->s_cap_lock
);
1324 * Create an mds request.
1326 struct ceph_mds_request
*
1327 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1329 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1332 return ERR_PTR(-ENOMEM
);
1334 mutex_init(&req
->r_fill_mutex
);
1336 req
->r_started
= jiffies
;
1337 req
->r_resend_mds
= -1;
1338 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1340 kref_init(&req
->r_kref
);
1341 INIT_LIST_HEAD(&req
->r_wait
);
1342 init_completion(&req
->r_completion
);
1343 init_completion(&req
->r_safe_completion
);
1344 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1347 req
->r_direct_mode
= mode
;
1352 * return oldest (lowest) request, tid in request tree, 0 if none.
1354 * called under mdsc->mutex.
1356 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1358 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1360 return rb_entry(rb_first(&mdsc
->request_tree
),
1361 struct ceph_mds_request
, r_node
);
1364 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1366 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1374 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1375 * on build_path_from_dentry in fs/cifs/dir.c.
1377 * If @stop_on_nosnap, generate path relative to the first non-snapped
1380 * Encode hidden .snap dirs as a double /, i.e.
1381 * foo/.snap/bar -> foo//bar
1383 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1386 struct dentry
*temp
;
1391 return ERR_PTR(-EINVAL
);
1395 for (temp
= dentry
; !IS_ROOT(temp
);) {
1396 struct inode
*inode
= temp
->d_inode
;
1397 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1398 len
++; /* slash only */
1399 else if (stop_on_nosnap
&& inode
&&
1400 ceph_snap(inode
) == CEPH_NOSNAP
)
1403 len
+= 1 + temp
->d_name
.len
;
1404 temp
= temp
->d_parent
;
1406 pr_err("build_path corrupt dentry %p\n", dentry
);
1407 return ERR_PTR(-EINVAL
);
1411 len
--; /* no leading '/' */
1413 path
= kmalloc(len
+1, GFP_NOFS
);
1415 return ERR_PTR(-ENOMEM
);
1417 path
[pos
] = 0; /* trailing null */
1418 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1419 struct inode
*inode
= temp
->d_inode
;
1421 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1422 dout("build_path path+%d: %p SNAPDIR\n",
1424 } else if (stop_on_nosnap
&& inode
&&
1425 ceph_snap(inode
) == CEPH_NOSNAP
) {
1428 pos
-= temp
->d_name
.len
;
1431 strncpy(path
+ pos
, temp
->d_name
.name
,
1436 temp
= temp
->d_parent
;
1438 pr_err("build_path corrupt dentry\n");
1440 return ERR_PTR(-EINVAL
);
1444 pr_err("build_path did not end path lookup where "
1445 "expected, namelen is %d, pos is %d\n", len
, pos
);
1446 /* presumably this is only possible if racing with a
1447 rename of one of the parent directories (we can not
1448 lock the dentries above us to prevent this, but
1449 retrying should be harmless) */
1454 *base
= ceph_ino(temp
->d_inode
);
1456 dout("build_path on %p %d built %llx '%.*s'\n",
1457 dentry
, atomic_read(&dentry
->d_count
), *base
, len
, path
);
1461 static int build_dentry_path(struct dentry
*dentry
,
1462 const char **ppath
, int *ppathlen
, u64
*pino
,
1467 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1468 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1469 *ppath
= dentry
->d_name
.name
;
1470 *ppathlen
= dentry
->d_name
.len
;
1473 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1475 return PTR_ERR(path
);
1481 static int build_inode_path(struct inode
*inode
,
1482 const char **ppath
, int *ppathlen
, u64
*pino
,
1485 struct dentry
*dentry
;
1488 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1489 *pino
= ceph_ino(inode
);
1493 dentry
= d_find_alias(inode
);
1494 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1497 return PTR_ERR(path
);
1504 * request arguments may be specified via an inode *, a dentry *, or
1505 * an explicit ino+path.
1507 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1508 const char *rpath
, u64 rino
,
1509 const char **ppath
, int *pathlen
,
1510 u64
*ino
, int *freepath
)
1515 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1516 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1518 } else if (rdentry
) {
1519 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1520 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1525 *pathlen
= strlen(rpath
);
1526 dout(" path %.*s\n", *pathlen
, rpath
);
1533 * called under mdsc->mutex
1535 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1536 struct ceph_mds_request
*req
,
1539 struct ceph_msg
*msg
;
1540 struct ceph_mds_request_head
*head
;
1541 const char *path1
= NULL
;
1542 const char *path2
= NULL
;
1543 u64 ino1
= 0, ino2
= 0;
1544 int pathlen1
= 0, pathlen2
= 0;
1545 int freepath1
= 0, freepath2
= 0;
1551 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1552 req
->r_path1
, req
->r_ino1
.ino
,
1553 &path1
, &pathlen1
, &ino1
, &freepath1
);
1559 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1560 req
->r_path2
, req
->r_ino2
.ino
,
1561 &path2
, &pathlen2
, &ino2
, &freepath2
);
1567 len
= sizeof(*head
) +
1568 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1570 /* calculate (max) length for cap releases */
1571 len
+= sizeof(struct ceph_mds_request_release
) *
1572 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1573 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1574 if (req
->r_dentry_drop
)
1575 len
+= req
->r_dentry
->d_name
.len
;
1576 if (req
->r_old_dentry_drop
)
1577 len
+= req
->r_old_dentry
->d_name
.len
;
1579 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
);
1581 msg
= ERR_PTR(-ENOMEM
);
1585 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1587 head
= msg
->front
.iov_base
;
1588 p
= msg
->front
.iov_base
+ sizeof(*head
);
1589 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1591 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1592 head
->op
= cpu_to_le32(req
->r_op
);
1593 head
->caller_uid
= cpu_to_le32(req
->r_uid
);
1594 head
->caller_gid
= cpu_to_le32(req
->r_gid
);
1595 head
->args
= req
->r_args
;
1597 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1598 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1600 /* make note of release offset, in case we need to replay */
1601 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1605 if (req
->r_inode_drop
)
1606 releases
+= ceph_encode_inode_release(&p
,
1607 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1608 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1609 if (req
->r_dentry_drop
)
1610 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1611 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1612 if (req
->r_old_dentry_drop
)
1613 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1614 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1615 if (req
->r_old_inode_drop
)
1616 releases
+= ceph_encode_inode_release(&p
,
1617 req
->r_old_dentry
->d_inode
,
1618 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1619 head
->num_releases
= cpu_to_le16(releases
);
1622 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1623 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1625 msg
->pages
= req
->r_pages
;
1626 msg
->nr_pages
= req
->r_num_pages
;
1627 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1628 msg
->hdr
.data_off
= cpu_to_le16(0);
1632 kfree((char *)path2
);
1635 kfree((char *)path1
);
1641 * called under mdsc->mutex if error, under no mutex if
1644 static void complete_request(struct ceph_mds_client
*mdsc
,
1645 struct ceph_mds_request
*req
)
1647 if (req
->r_callback
)
1648 req
->r_callback(mdsc
, req
);
1650 complete_all(&req
->r_completion
);
1654 * called under mdsc->mutex
1656 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1657 struct ceph_mds_request
*req
,
1660 struct ceph_mds_request_head
*rhead
;
1661 struct ceph_msg
*msg
;
1667 struct ceph_cap
*cap
=
1668 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
1671 req
->r_sent_on_mseq
= cap
->mseq
;
1673 req
->r_sent_on_mseq
= -1;
1675 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1676 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1678 if (req
->r_got_unsafe
) {
1680 * Replay. Do not regenerate message (and rebuild
1681 * paths, etc.); just use the original message.
1682 * Rebuilding paths will break for renames because
1683 * d_move mangles the src name.
1685 msg
= req
->r_request
;
1686 rhead
= msg
->front
.iov_base
;
1688 flags
= le32_to_cpu(rhead
->flags
);
1689 flags
|= CEPH_MDS_FLAG_REPLAY
;
1690 rhead
->flags
= cpu_to_le32(flags
);
1692 if (req
->r_target_inode
)
1693 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1695 rhead
->num_retry
= req
->r_attempts
- 1;
1697 /* remove cap/dentry releases from message */
1698 rhead
->num_releases
= 0;
1699 msg
->hdr
.front_len
= cpu_to_le32(req
->r_request_release_offset
);
1700 msg
->front
.iov_len
= req
->r_request_release_offset
;
1704 if (req
->r_request
) {
1705 ceph_msg_put(req
->r_request
);
1706 req
->r_request
= NULL
;
1708 msg
= create_request_message(mdsc
, req
, mds
);
1710 req
->r_err
= PTR_ERR(msg
);
1711 complete_request(mdsc
, req
);
1712 return PTR_ERR(msg
);
1714 req
->r_request
= msg
;
1716 rhead
= msg
->front
.iov_base
;
1717 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1718 if (req
->r_got_unsafe
)
1719 flags
|= CEPH_MDS_FLAG_REPLAY
;
1720 if (req
->r_locked_dir
)
1721 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1722 rhead
->flags
= cpu_to_le32(flags
);
1723 rhead
->num_fwd
= req
->r_num_fwd
;
1724 rhead
->num_retry
= req
->r_attempts
- 1;
1727 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1732 * send request, or put it on the appropriate wait list.
1734 static int __do_request(struct ceph_mds_client
*mdsc
,
1735 struct ceph_mds_request
*req
)
1737 struct ceph_mds_session
*session
= NULL
;
1741 if (req
->r_err
|| req
->r_got_result
)
1744 if (req
->r_timeout
&&
1745 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1746 dout("do_request timed out\n");
1751 mds
= __choose_mds(mdsc
, req
);
1753 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1754 dout("do_request no mds or not active, waiting for map\n");
1755 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1759 /* get, open session */
1760 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1762 session
= register_session(mdsc
, mds
);
1763 if (IS_ERR(session
)) {
1764 err
= PTR_ERR(session
);
1768 dout("do_request mds%d session %p state %s\n", mds
, session
,
1769 session_state_name(session
->s_state
));
1770 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1771 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
1772 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
1773 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
1774 __open_session(mdsc
, session
);
1775 list_add(&req
->r_wait
, &session
->s_waiting
);
1780 req
->r_session
= get_session(session
);
1781 req
->r_resend_mds
= -1; /* forget any previous mds hint */
1783 if (req
->r_request_started
== 0) /* note request start time */
1784 req
->r_request_started
= jiffies
;
1786 err
= __prepare_send_request(mdsc
, req
, mds
);
1788 ceph_msg_get(req
->r_request
);
1789 ceph_con_send(&session
->s_con
, req
->r_request
);
1793 ceph_put_mds_session(session
);
1799 complete_request(mdsc
, req
);
1804 * called under mdsc->mutex
1806 static void __wake_requests(struct ceph_mds_client
*mdsc
,
1807 struct list_head
*head
)
1809 struct ceph_mds_request
*req
, *nreq
;
1811 list_for_each_entry_safe(req
, nreq
, head
, r_wait
) {
1812 list_del_init(&req
->r_wait
);
1813 __do_request(mdsc
, req
);
1818 * Wake up threads with requests pending for @mds, so that they can
1819 * resubmit their requests to a possibly different mds.
1821 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
1823 struct ceph_mds_request
*req
;
1826 dout("kick_requests mds%d\n", mds
);
1827 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
1828 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1829 if (req
->r_got_unsafe
)
1831 if (req
->r_session
&&
1832 req
->r_session
->s_mds
== mds
) {
1833 dout(" kicking tid %llu\n", req
->r_tid
);
1834 put_request_session(req
);
1835 __do_request(mdsc
, req
);
1840 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
1841 struct ceph_mds_request
*req
)
1843 dout("submit_request on %p\n", req
);
1844 mutex_lock(&mdsc
->mutex
);
1845 __register_request(mdsc
, req
, NULL
);
1846 __do_request(mdsc
, req
);
1847 mutex_unlock(&mdsc
->mutex
);
1851 * Synchrously perform an mds request. Take care of all of the
1852 * session setup, forwarding, retry details.
1854 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
1856 struct ceph_mds_request
*req
)
1860 dout("do_request on %p\n", req
);
1862 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1864 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
1865 if (req
->r_locked_dir
)
1866 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
1867 if (req
->r_old_dentry
)
1869 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
1873 mutex_lock(&mdsc
->mutex
);
1874 __register_request(mdsc
, req
, dir
);
1875 __do_request(mdsc
, req
);
1879 __unregister_request(mdsc
, req
);
1880 dout("do_request early error %d\n", err
);
1885 mutex_unlock(&mdsc
->mutex
);
1886 dout("do_request waiting\n");
1887 if (req
->r_timeout
) {
1888 err
= (long)wait_for_completion_killable_timeout(
1889 &req
->r_completion
, req
->r_timeout
);
1893 err
= wait_for_completion_killable(&req
->r_completion
);
1895 dout("do_request waited, got %d\n", err
);
1896 mutex_lock(&mdsc
->mutex
);
1898 /* only abort if we didn't race with a real reply */
1899 if (req
->r_got_result
) {
1900 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
1901 } else if (err
< 0) {
1902 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
1905 * ensure we aren't running concurrently with
1906 * ceph_fill_trace or ceph_readdir_prepopulate, which
1907 * rely on locks (dir mutex) held by our caller.
1909 mutex_lock(&req
->r_fill_mutex
);
1911 req
->r_aborted
= true;
1912 mutex_unlock(&req
->r_fill_mutex
);
1914 if (req
->r_locked_dir
&&
1915 (req
->r_op
& CEPH_MDS_OP_WRITE
))
1916 ceph_invalidate_dir_request(req
);
1922 mutex_unlock(&mdsc
->mutex
);
1923 dout("do_request %p done, result %d\n", req
, err
);
1928 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
1929 * namespace request.
1931 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
1933 struct inode
*inode
= req
->r_locked_dir
;
1934 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1936 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode
);
1937 spin_lock(&inode
->i_lock
);
1938 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1939 ci
->i_release_count
++;
1940 spin_unlock(&inode
->i_lock
);
1943 ceph_invalidate_dentry_lease(req
->r_dentry
);
1944 if (req
->r_old_dentry
)
1945 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
1951 * We take the session mutex and parse and process the reply immediately.
1952 * This preserves the logical ordering of replies, capabilities, etc., sent
1953 * by the MDS as they are applied to our local cache.
1955 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
1957 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
1958 struct ceph_mds_request
*req
;
1959 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
1960 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
1963 int mds
= session
->s_mds
;
1965 if (msg
->front
.iov_len
< sizeof(*head
)) {
1966 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
1971 /* get request, session */
1972 tid
= le64_to_cpu(msg
->hdr
.tid
);
1973 mutex_lock(&mdsc
->mutex
);
1974 req
= __lookup_request(mdsc
, tid
);
1976 dout("handle_reply on unknown tid %llu\n", tid
);
1977 mutex_unlock(&mdsc
->mutex
);
1980 dout("handle_reply %p\n", req
);
1982 /* correct session? */
1983 if (req
->r_session
!= session
) {
1984 pr_err("mdsc_handle_reply got %llu on session mds%d"
1985 " not mds%d\n", tid
, session
->s_mds
,
1986 req
->r_session
? req
->r_session
->s_mds
: -1);
1987 mutex_unlock(&mdsc
->mutex
);
1992 if ((req
->r_got_unsafe
&& !head
->safe
) ||
1993 (req
->r_got_safe
&& head
->safe
)) {
1994 pr_warning("got a dup %s reply on %llu from mds%d\n",
1995 head
->safe
? "safe" : "unsafe", tid
, mds
);
1996 mutex_unlock(&mdsc
->mutex
);
1999 if (req
->r_got_safe
&& !head
->safe
) {
2000 pr_warning("got unsafe after safe on %llu from mds%d\n",
2002 mutex_unlock(&mdsc
->mutex
);
2006 result
= le32_to_cpu(head
->result
);
2010 * if we're not talking to the authority, send to them
2011 * if the authority has changed while we weren't looking,
2012 * send to new authority
2013 * Otherwise we just have to return an ESTALE
2015 if (result
== -ESTALE
) {
2016 dout("got ESTALE on request %llu", req
->r_tid
);
2017 if (!req
->r_inode
) {
2018 /* do nothing; not an authority problem */
2019 } else if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2020 dout("not using auth, setting for that now");
2021 req
->r_direct_mode
= USE_AUTH_MDS
;
2022 __do_request(mdsc
, req
);
2023 mutex_unlock(&mdsc
->mutex
);
2026 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
2027 struct ceph_cap
*cap
=
2028 ceph_get_cap_for_mds(ci
, req
->r_mds
);;
2030 dout("already using auth");
2031 if ((!cap
|| cap
!= ci
->i_auth_cap
) ||
2032 (cap
->mseq
!= req
->r_sent_on_mseq
)) {
2033 dout("but cap changed, so resending");
2034 __do_request(mdsc
, req
);
2035 mutex_unlock(&mdsc
->mutex
);
2039 dout("have to return ESTALE on request %llu", req
->r_tid
);
2044 req
->r_got_safe
= true;
2045 __unregister_request(mdsc
, req
);
2046 complete_all(&req
->r_safe_completion
);
2048 if (req
->r_got_unsafe
) {
2050 * We already handled the unsafe response, now do the
2051 * cleanup. No need to examine the response; the MDS
2052 * doesn't include any result info in the safe
2053 * response. And even if it did, there is nothing
2054 * useful we could do with a revised return value.
2056 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2057 list_del_init(&req
->r_unsafe_item
);
2059 /* last unsafe request during umount? */
2060 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2061 complete_all(&mdsc
->safe_umount_waiters
);
2062 mutex_unlock(&mdsc
->mutex
);
2066 req
->r_got_unsafe
= true;
2067 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2070 dout("handle_reply tid %lld result %d\n", tid
, result
);
2071 rinfo
= &req
->r_reply_info
;
2072 err
= parse_reply_info(msg
, rinfo
);
2073 mutex_unlock(&mdsc
->mutex
);
2075 mutex_lock(&session
->s_mutex
);
2077 pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds
);
2083 if (rinfo
->snapblob_len
) {
2084 down_write(&mdsc
->snap_rwsem
);
2085 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2086 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2087 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
2088 downgrade_write(&mdsc
->snap_rwsem
);
2090 down_read(&mdsc
->snap_rwsem
);
2093 /* insert trace into our cache */
2094 mutex_lock(&req
->r_fill_mutex
);
2095 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2097 if (result
== 0 && rinfo
->dir_nr
)
2098 ceph_readdir_prepopulate(req
, req
->r_session
);
2099 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2101 mutex_unlock(&req
->r_fill_mutex
);
2103 up_read(&mdsc
->snap_rwsem
);
2105 mutex_lock(&mdsc
->mutex
);
2106 if (!req
->r_aborted
) {
2112 req
->r_got_result
= true;
2115 dout("reply arrived after request %lld was aborted\n", tid
);
2117 mutex_unlock(&mdsc
->mutex
);
2119 ceph_add_cap_releases(mdsc
, req
->r_session
);
2120 mutex_unlock(&session
->s_mutex
);
2122 /* kick calling process */
2123 complete_request(mdsc
, req
);
2125 ceph_mdsc_put_request(req
);
2132 * handle mds notification that our request has been forwarded.
2134 static void handle_forward(struct ceph_mds_client
*mdsc
,
2135 struct ceph_mds_session
*session
,
2136 struct ceph_msg
*msg
)
2138 struct ceph_mds_request
*req
;
2139 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2143 void *p
= msg
->front
.iov_base
;
2144 void *end
= p
+ msg
->front
.iov_len
;
2146 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2147 next_mds
= ceph_decode_32(&p
);
2148 fwd_seq
= ceph_decode_32(&p
);
2150 mutex_lock(&mdsc
->mutex
);
2151 req
= __lookup_request(mdsc
, tid
);
2153 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2154 goto out
; /* dup reply? */
2157 if (req
->r_aborted
) {
2158 dout("forward tid %llu aborted, unregistering\n", tid
);
2159 __unregister_request(mdsc
, req
);
2160 } else if (fwd_seq
<= req
->r_num_fwd
) {
2161 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2162 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2164 /* resend. forward race not possible; mds would drop */
2165 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2167 BUG_ON(req
->r_got_result
);
2168 req
->r_num_fwd
= fwd_seq
;
2169 req
->r_resend_mds
= next_mds
;
2170 put_request_session(req
);
2171 __do_request(mdsc
, req
);
2173 ceph_mdsc_put_request(req
);
2175 mutex_unlock(&mdsc
->mutex
);
2179 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2183 * handle a mds session control message
2185 static void handle_session(struct ceph_mds_session
*session
,
2186 struct ceph_msg
*msg
)
2188 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2191 int mds
= session
->s_mds
;
2192 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2196 if (msg
->front
.iov_len
!= sizeof(*h
))
2198 op
= le32_to_cpu(h
->op
);
2199 seq
= le64_to_cpu(h
->seq
);
2201 mutex_lock(&mdsc
->mutex
);
2202 if (op
== CEPH_SESSION_CLOSE
)
2203 __unregister_session(mdsc
, session
);
2204 /* FIXME: this ttl calculation is generous */
2205 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2206 mutex_unlock(&mdsc
->mutex
);
2208 mutex_lock(&session
->s_mutex
);
2210 dout("handle_session mds%d %s %p state %s seq %llu\n",
2211 mds
, ceph_session_op_name(op
), session
,
2212 session_state_name(session
->s_state
), seq
);
2214 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2215 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2216 pr_info("mds%d came back\n", session
->s_mds
);
2220 case CEPH_SESSION_OPEN
:
2221 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2222 pr_info("mds%d reconnect success\n", session
->s_mds
);
2223 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2224 renewed_caps(mdsc
, session
, 0);
2227 __close_session(mdsc
, session
);
2230 case CEPH_SESSION_RENEWCAPS
:
2231 if (session
->s_renew_seq
== seq
)
2232 renewed_caps(mdsc
, session
, 1);
2235 case CEPH_SESSION_CLOSE
:
2236 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2237 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2238 remove_session_caps(session
);
2239 wake
= 1; /* for good measure */
2240 wake_up_all(&mdsc
->session_close_wq
);
2241 kick_requests(mdsc
, mds
);
2244 case CEPH_SESSION_STALE
:
2245 pr_info("mds%d caps went stale, renewing\n",
2247 spin_lock(&session
->s_cap_lock
);
2248 session
->s_cap_gen
++;
2249 session
->s_cap_ttl
= 0;
2250 spin_unlock(&session
->s_cap_lock
);
2251 send_renew_caps(mdsc
, session
);
2254 case CEPH_SESSION_RECALL_STATE
:
2255 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2259 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2263 mutex_unlock(&session
->s_mutex
);
2265 mutex_lock(&mdsc
->mutex
);
2266 __wake_requests(mdsc
, &session
->s_waiting
);
2267 mutex_unlock(&mdsc
->mutex
);
2272 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2273 (int)msg
->front
.iov_len
);
2280 * called under session->mutex.
2282 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2283 struct ceph_mds_session
*session
)
2285 struct ceph_mds_request
*req
, *nreq
;
2288 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2290 mutex_lock(&mdsc
->mutex
);
2291 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2292 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2294 ceph_msg_get(req
->r_request
);
2295 ceph_con_send(&session
->s_con
, req
->r_request
);
2298 mutex_unlock(&mdsc
->mutex
);
2302 * Encode information about a cap for a reconnect with the MDS.
2304 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2308 struct ceph_mds_cap_reconnect v2
;
2309 struct ceph_mds_cap_reconnect_v1 v1
;
2312 struct ceph_inode_info
*ci
;
2313 struct ceph_reconnect_state
*recon_state
= arg
;
2314 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2318 struct dentry
*dentry
;
2322 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2323 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2324 ceph_cap_string(cap
->issued
));
2325 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2329 dentry
= d_find_alias(inode
);
2331 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2333 err
= PTR_ERR(path
);
2340 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2344 spin_lock(&inode
->i_lock
);
2345 cap
->seq
= 0; /* reset cap seq */
2346 cap
->issue_seq
= 0; /* and issue_seq */
2348 if (recon_state
->flock
) {
2349 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2350 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2351 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2352 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2353 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2354 rec
.v2
.flock_len
= 0;
2355 reclen
= sizeof(rec
.v2
);
2357 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2358 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2359 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2360 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2361 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2362 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2363 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2364 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2365 reclen
= sizeof(rec
.v1
);
2367 spin_unlock(&inode
->i_lock
);
2369 if (recon_state
->flock
) {
2370 int num_fcntl_locks
, num_flock_locks
;
2371 struct ceph_pagelist_cursor trunc_point
;
2373 ceph_pagelist_set_cursor(pagelist
, &trunc_point
);
2376 ceph_count_locks(inode
, &num_fcntl_locks
,
2378 rec
.v2
.flock_len
= (2*sizeof(u32
) +
2379 (num_fcntl_locks
+num_flock_locks
) *
2380 sizeof(struct ceph_filelock
));
2383 /* pre-alloc pagelist */
2384 ceph_pagelist_truncate(pagelist
, &trunc_point
);
2385 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2387 err
= ceph_pagelist_reserve(pagelist
,
2393 err
= ceph_encode_locks(inode
,
2399 } while (err
== -ENOSPC
);
2401 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2413 * If an MDS fails and recovers, clients need to reconnect in order to
2414 * reestablish shared state. This includes all caps issued through
2415 * this session _and_ the snap_realm hierarchy. Because it's not
2416 * clear which snap realms the mds cares about, we send everything we
2417 * know about.. that ensures we'll then get any new info the
2418 * recovering MDS might have.
2420 * This is a relatively heavyweight operation, but it's rare.
2422 * called with mdsc->mutex held.
2424 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2425 struct ceph_mds_session
*session
)
2427 struct ceph_msg
*reply
;
2429 int mds
= session
->s_mds
;
2431 struct ceph_pagelist
*pagelist
;
2432 struct ceph_reconnect_state recon_state
;
2434 pr_info("mds%d reconnect start\n", mds
);
2436 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2438 goto fail_nopagelist
;
2439 ceph_pagelist_init(pagelist
);
2441 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
);
2445 mutex_lock(&session
->s_mutex
);
2446 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2449 ceph_con_open(&session
->s_con
,
2450 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2452 /* replay unsafe requests */
2453 replay_unsafe_requests(mdsc
, session
);
2455 down_read(&mdsc
->snap_rwsem
);
2457 dout("session %p state %s\n", session
,
2458 session_state_name(session
->s_state
));
2460 /* drop old cap expires; we're about to reestablish that state */
2461 discard_cap_releases(mdsc
, session
);
2463 /* traverse this session's caps */
2464 err
= ceph_pagelist_encode_32(pagelist
, session
->s_nr_caps
);
2468 recon_state
.pagelist
= pagelist
;
2469 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2470 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2475 * snaprealms. we provide mds with the ino, seq (version), and
2476 * parent for all of our realms. If the mds has any newer info,
2479 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2480 struct ceph_snap_realm
*realm
=
2481 rb_entry(p
, struct ceph_snap_realm
, node
);
2482 struct ceph_mds_snaprealm_reconnect sr_rec
;
2484 dout(" adding snap realm %llx seq %lld parent %llx\n",
2485 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2486 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2487 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2488 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2489 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2494 reply
->pagelist
= pagelist
;
2495 if (recon_state
.flock
)
2496 reply
->hdr
.version
= cpu_to_le16(2);
2497 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2498 reply
->nr_pages
= calc_pages_for(0, pagelist
->length
);
2499 ceph_con_send(&session
->s_con
, reply
);
2501 mutex_unlock(&session
->s_mutex
);
2503 mutex_lock(&mdsc
->mutex
);
2504 __wake_requests(mdsc
, &session
->s_waiting
);
2505 mutex_unlock(&mdsc
->mutex
);
2507 up_read(&mdsc
->snap_rwsem
);
2511 ceph_msg_put(reply
);
2512 up_read(&mdsc
->snap_rwsem
);
2513 mutex_unlock(&session
->s_mutex
);
2515 ceph_pagelist_release(pagelist
);
2518 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2524 * compare old and new mdsmaps, kicking requests
2525 * and closing out old connections as necessary
2527 * called under mdsc->mutex.
2529 static void check_new_map(struct ceph_mds_client
*mdsc
,
2530 struct ceph_mdsmap
*newmap
,
2531 struct ceph_mdsmap
*oldmap
)
2534 int oldstate
, newstate
;
2535 struct ceph_mds_session
*s
;
2537 dout("check_new_map new %u old %u\n",
2538 newmap
->m_epoch
, oldmap
->m_epoch
);
2540 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2541 if (mdsc
->sessions
[i
] == NULL
)
2543 s
= mdsc
->sessions
[i
];
2544 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2545 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2547 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2548 i
, ceph_mds_state_name(oldstate
),
2549 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
2550 ceph_mds_state_name(newstate
),
2551 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
2552 session_state_name(s
->s_state
));
2554 if (memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2555 ceph_mdsmap_get_addr(newmap
, i
),
2556 sizeof(struct ceph_entity_addr
))) {
2557 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2558 /* the session never opened, just close it
2560 __wake_requests(mdsc
, &s
->s_waiting
);
2561 __unregister_session(mdsc
, s
);
2564 mutex_unlock(&mdsc
->mutex
);
2565 mutex_lock(&s
->s_mutex
);
2566 mutex_lock(&mdsc
->mutex
);
2567 ceph_con_close(&s
->s_con
);
2568 mutex_unlock(&s
->s_mutex
);
2569 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2572 /* kick any requests waiting on the recovering mds */
2573 kick_requests(mdsc
, i
);
2574 } else if (oldstate
== newstate
) {
2575 continue; /* nothing new with this mds */
2581 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2582 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
2583 mutex_unlock(&mdsc
->mutex
);
2584 send_mds_reconnect(mdsc
, s
);
2585 mutex_lock(&mdsc
->mutex
);
2589 * kick request on any mds that has gone active.
2591 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2592 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2593 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
2594 oldstate
!= CEPH_MDS_STATE_STARTING
)
2595 pr_info("mds%d recovery completed\n", s
->s_mds
);
2596 kick_requests(mdsc
, i
);
2597 ceph_kick_flushing_caps(mdsc
, s
);
2598 wake_up_session_caps(s
, 1);
2602 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2603 s
= mdsc
->sessions
[i
];
2606 if (!ceph_mdsmap_is_laggy(newmap
, i
))
2608 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2609 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
2610 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2611 dout(" connecting to export targets of laggy mds%d\n",
2613 __open_export_target_sessions(mdsc
, s
);
2625 * caller must hold session s_mutex, dentry->d_lock
2627 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2629 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2631 ceph_put_mds_session(di
->lease_session
);
2632 di
->lease_session
= NULL
;
2635 static void handle_lease(struct ceph_mds_client
*mdsc
,
2636 struct ceph_mds_session
*session
,
2637 struct ceph_msg
*msg
)
2639 struct super_block
*sb
= mdsc
->fsc
->sb
;
2640 struct inode
*inode
;
2641 struct ceph_inode_info
*ci
;
2642 struct dentry
*parent
, *dentry
;
2643 struct ceph_dentry_info
*di
;
2644 int mds
= session
->s_mds
;
2645 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2647 struct ceph_vino vino
;
2652 dout("handle_lease from mds%d\n", mds
);
2655 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2657 vino
.ino
= le64_to_cpu(h
->ino
);
2658 vino
.snap
= CEPH_NOSNAP
;
2659 mask
= le16_to_cpu(h
->mask
);
2660 seq
= le32_to_cpu(h
->seq
);
2661 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2662 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2663 if (dname
.len
!= get_unaligned_le32(h
+1))
2666 mutex_lock(&session
->s_mutex
);
2670 inode
= ceph_find_inode(sb
, vino
);
2671 dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
2672 ceph_lease_op_name(h
->action
), mask
, vino
.ino
, inode
,
2673 dname
.len
, dname
.name
);
2674 if (inode
== NULL
) {
2675 dout("handle_lease no inode %llx\n", vino
.ino
);
2678 ci
= ceph_inode(inode
);
2681 parent
= d_find_alias(inode
);
2683 dout("no parent dentry on inode %p\n", inode
);
2685 goto release
; /* hrm... */
2687 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2688 dentry
= d_lookup(parent
, &dname
);
2693 spin_lock(&dentry
->d_lock
);
2694 di
= ceph_dentry(dentry
);
2695 switch (h
->action
) {
2696 case CEPH_MDS_LEASE_REVOKE
:
2697 if (di
&& di
->lease_session
== session
) {
2698 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
2699 h
->seq
= cpu_to_le32(di
->lease_seq
);
2700 __ceph_mdsc_drop_dentry_lease(dentry
);
2705 case CEPH_MDS_LEASE_RENEW
:
2706 if (di
&& di
->lease_session
== session
&&
2707 di
->lease_gen
== session
->s_cap_gen
&&
2708 di
->lease_renew_from
&&
2709 di
->lease_renew_after
== 0) {
2710 unsigned long duration
=
2711 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2713 di
->lease_seq
= seq
;
2714 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2715 di
->lease_renew_after
= di
->lease_renew_from
+
2717 di
->lease_renew_from
= 0;
2721 spin_unlock(&dentry
->d_lock
);
2728 /* let's just reuse the same message */
2729 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2731 ceph_con_send(&session
->s_con
, msg
);
2735 mutex_unlock(&session
->s_mutex
);
2739 pr_err("corrupt lease message\n");
2743 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
2744 struct inode
*inode
,
2745 struct dentry
*dentry
, char action
,
2748 struct ceph_msg
*msg
;
2749 struct ceph_mds_lease
*lease
;
2750 int len
= sizeof(*lease
) + sizeof(u32
);
2753 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2754 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
2755 dnamelen
= dentry
->d_name
.len
;
2758 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
);
2761 lease
= msg
->front
.iov_base
;
2762 lease
->action
= action
;
2763 lease
->mask
= cpu_to_le16(1);
2764 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
2765 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
2766 lease
->seq
= cpu_to_le32(seq
);
2767 put_unaligned_le32(dnamelen
, lease
+ 1);
2768 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
2771 * if this is a preemptive lease RELEASE, no need to
2772 * flush request stream, since the actual request will
2775 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
2777 ceph_con_send(&session
->s_con
, msg
);
2781 * Preemptively release a lease we expect to invalidate anyway.
2782 * Pass @inode always, @dentry is optional.
2784 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
2785 struct dentry
*dentry
, int mask
)
2787 struct ceph_dentry_info
*di
;
2788 struct ceph_mds_session
*session
;
2791 BUG_ON(inode
== NULL
);
2792 BUG_ON(dentry
== NULL
);
2795 /* is dentry lease valid? */
2796 spin_lock(&dentry
->d_lock
);
2797 di
= ceph_dentry(dentry
);
2798 if (!di
|| !di
->lease_session
||
2799 di
->lease_session
->s_mds
< 0 ||
2800 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
2801 !time_before(jiffies
, dentry
->d_time
)) {
2802 dout("lease_release inode %p dentry %p -- "
2804 inode
, dentry
, mask
);
2805 spin_unlock(&dentry
->d_lock
);
2809 /* we do have a lease on this dentry; note mds and seq */
2810 session
= ceph_get_mds_session(di
->lease_session
);
2811 seq
= di
->lease_seq
;
2812 __ceph_mdsc_drop_dentry_lease(dentry
);
2813 spin_unlock(&dentry
->d_lock
);
2815 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2816 inode
, dentry
, mask
, session
->s_mds
);
2817 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
2818 CEPH_MDS_LEASE_RELEASE
, seq
);
2819 ceph_put_mds_session(session
);
2823 * drop all leases (and dentry refs) in preparation for umount
2825 static void drop_leases(struct ceph_mds_client
*mdsc
)
2829 dout("drop_leases\n");
2830 mutex_lock(&mdsc
->mutex
);
2831 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2832 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2835 mutex_unlock(&mdsc
->mutex
);
2836 mutex_lock(&s
->s_mutex
);
2837 mutex_unlock(&s
->s_mutex
);
2838 ceph_put_mds_session(s
);
2839 mutex_lock(&mdsc
->mutex
);
2841 mutex_unlock(&mdsc
->mutex
);
2847 * delayed work -- periodically trim expired leases, renew caps with mds
2849 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
2852 unsigned hz
= round_jiffies_relative(HZ
* delay
);
2853 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
2856 static void delayed_work(struct work_struct
*work
)
2859 struct ceph_mds_client
*mdsc
=
2860 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
2864 dout("mdsc delayed_work\n");
2865 ceph_check_delayed_caps(mdsc
);
2867 mutex_lock(&mdsc
->mutex
);
2868 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
2869 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
2870 mdsc
->last_renew_caps
);
2872 mdsc
->last_renew_caps
= jiffies
;
2874 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2875 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2878 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2879 dout("resending session close request for mds%d\n",
2881 request_close_session(mdsc
, s
);
2882 ceph_put_mds_session(s
);
2885 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
2886 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
2887 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
2888 pr_info("mds%d hung\n", s
->s_mds
);
2891 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
2892 /* this mds is failed or recovering, just wait */
2893 ceph_put_mds_session(s
);
2896 mutex_unlock(&mdsc
->mutex
);
2898 mutex_lock(&s
->s_mutex
);
2900 send_renew_caps(mdsc
, s
);
2902 ceph_con_keepalive(&s
->s_con
);
2903 ceph_add_cap_releases(mdsc
, s
);
2904 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2905 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
2906 ceph_send_cap_releases(mdsc
, s
);
2907 mutex_unlock(&s
->s_mutex
);
2908 ceph_put_mds_session(s
);
2910 mutex_lock(&mdsc
->mutex
);
2912 mutex_unlock(&mdsc
->mutex
);
2914 schedule_delayed(mdsc
);
2917 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
2920 struct ceph_mds_client
*mdsc
;
2922 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
2927 mutex_init(&mdsc
->mutex
);
2928 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
2929 if (mdsc
->mdsmap
== NULL
)
2932 init_completion(&mdsc
->safe_umount_waiters
);
2933 init_waitqueue_head(&mdsc
->session_close_wq
);
2934 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
2935 mdsc
->sessions
= NULL
;
2936 mdsc
->max_sessions
= 0;
2938 init_rwsem(&mdsc
->snap_rwsem
);
2939 mdsc
->snap_realms
= RB_ROOT
;
2940 INIT_LIST_HEAD(&mdsc
->snap_empty
);
2941 spin_lock_init(&mdsc
->snap_empty_lock
);
2943 mdsc
->request_tree
= RB_ROOT
;
2944 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
2945 mdsc
->last_renew_caps
= jiffies
;
2946 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
2947 spin_lock_init(&mdsc
->cap_delay_lock
);
2948 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
2949 spin_lock_init(&mdsc
->snap_flush_lock
);
2950 mdsc
->cap_flush_seq
= 0;
2951 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
2952 mdsc
->num_cap_flushing
= 0;
2953 spin_lock_init(&mdsc
->cap_dirty_lock
);
2954 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
2955 spin_lock_init(&mdsc
->dentry_lru_lock
);
2956 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
2958 ceph_caps_init(mdsc
);
2959 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
2965 * Wait for safe replies on open mds requests. If we time out, drop
2966 * all requests from the tree to avoid dangling dentry refs.
2968 static void wait_requests(struct ceph_mds_client
*mdsc
)
2970 struct ceph_mds_request
*req
;
2971 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
2973 mutex_lock(&mdsc
->mutex
);
2974 if (__get_oldest_req(mdsc
)) {
2975 mutex_unlock(&mdsc
->mutex
);
2977 dout("wait_requests waiting for requests\n");
2978 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
2979 fsc
->client
->options
->mount_timeout
* HZ
);
2981 /* tear down remaining requests */
2982 mutex_lock(&mdsc
->mutex
);
2983 while ((req
= __get_oldest_req(mdsc
))) {
2984 dout("wait_requests timed out on tid %llu\n",
2986 __unregister_request(mdsc
, req
);
2989 mutex_unlock(&mdsc
->mutex
);
2990 dout("wait_requests done\n");
2994 * called before mount is ro, and before dentries are torn down.
2995 * (hmm, does this still race with new lookups?)
2997 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
2999 dout("pre_umount\n");
3003 ceph_flush_dirty_caps(mdsc
);
3004 wait_requests(mdsc
);
3007 * wait for reply handlers to drop their request refs and
3008 * their inode/dcache refs
3014 * wait for all write mds requests to flush.
3016 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3018 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3021 mutex_lock(&mdsc
->mutex
);
3022 dout("wait_unsafe_requests want %lld\n", want_tid
);
3024 req
= __get_oldest_req(mdsc
);
3025 while (req
&& req
->r_tid
<= want_tid
) {
3026 /* find next request */
3027 n
= rb_next(&req
->r_node
);
3029 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3032 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3034 ceph_mdsc_get_request(req
);
3036 ceph_mdsc_get_request(nextreq
);
3037 mutex_unlock(&mdsc
->mutex
);
3038 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3039 req
->r_tid
, want_tid
);
3040 wait_for_completion(&req
->r_safe_completion
);
3041 mutex_lock(&mdsc
->mutex
);
3042 ceph_mdsc_put_request(req
);
3044 break; /* next dne before, so we're done! */
3045 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3046 /* next request was removed from tree */
3047 ceph_mdsc_put_request(nextreq
);
3050 ceph_mdsc_put_request(nextreq
); /* won't go away */
3054 mutex_unlock(&mdsc
->mutex
);
3055 dout("wait_unsafe_requests done\n");
3058 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3060 u64 want_tid
, want_flush
;
3062 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3066 mutex_lock(&mdsc
->mutex
);
3067 want_tid
= mdsc
->last_tid
;
3068 want_flush
= mdsc
->cap_flush_seq
;
3069 mutex_unlock(&mdsc
->mutex
);
3070 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3072 ceph_flush_dirty_caps(mdsc
);
3074 wait_unsafe_requests(mdsc
, want_tid
);
3075 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
3079 * true if all sessions are closed, or we force unmount
3081 bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3085 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3088 mutex_lock(&mdsc
->mutex
);
3089 for (i
= 0; i
< mdsc
->max_sessions
; i
++)
3090 if (mdsc
->sessions
[i
])
3092 mutex_unlock(&mdsc
->mutex
);
3097 * called after sb is ro.
3099 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3101 struct ceph_mds_session
*session
;
3103 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3104 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3106 dout("close_sessions\n");
3108 /* close sessions */
3109 mutex_lock(&mdsc
->mutex
);
3110 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3111 session
= __ceph_lookup_mds_session(mdsc
, i
);
3114 mutex_unlock(&mdsc
->mutex
);
3115 mutex_lock(&session
->s_mutex
);
3116 __close_session(mdsc
, session
);
3117 mutex_unlock(&session
->s_mutex
);
3118 ceph_put_mds_session(session
);
3119 mutex_lock(&mdsc
->mutex
);
3121 mutex_unlock(&mdsc
->mutex
);
3123 dout("waiting for sessions to close\n");
3124 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3127 /* tear down remaining sessions */
3128 mutex_lock(&mdsc
->mutex
);
3129 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3130 if (mdsc
->sessions
[i
]) {
3131 session
= get_session(mdsc
->sessions
[i
]);
3132 __unregister_session(mdsc
, session
);
3133 mutex_unlock(&mdsc
->mutex
);
3134 mutex_lock(&session
->s_mutex
);
3135 remove_session_caps(session
);
3136 mutex_unlock(&session
->s_mutex
);
3137 ceph_put_mds_session(session
);
3138 mutex_lock(&mdsc
->mutex
);
3141 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3142 mutex_unlock(&mdsc
->mutex
);
3144 ceph_cleanup_empty_realms(mdsc
);
3146 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3151 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3154 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3156 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3157 kfree(mdsc
->sessions
);
3158 ceph_caps_finalize(mdsc
);
3161 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3163 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3165 ceph_mdsc_stop(mdsc
);
3172 * handle mds map update.
3174 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3178 void *p
= msg
->front
.iov_base
;
3179 void *end
= p
+ msg
->front
.iov_len
;
3180 struct ceph_mdsmap
*newmap
, *oldmap
;
3181 struct ceph_fsid fsid
;
3184 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3185 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3186 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3188 epoch
= ceph_decode_32(&p
);
3189 maplen
= ceph_decode_32(&p
);
3190 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3192 /* do we need it? */
3193 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3194 mutex_lock(&mdsc
->mutex
);
3195 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3196 dout("handle_map epoch %u <= our %u\n",
3197 epoch
, mdsc
->mdsmap
->m_epoch
);
3198 mutex_unlock(&mdsc
->mutex
);
3202 newmap
= ceph_mdsmap_decode(&p
, end
);
3203 if (IS_ERR(newmap
)) {
3204 err
= PTR_ERR(newmap
);
3208 /* swap into place */
3210 oldmap
= mdsc
->mdsmap
;
3211 mdsc
->mdsmap
= newmap
;
3212 check_new_map(mdsc
, newmap
, oldmap
);
3213 ceph_mdsmap_destroy(oldmap
);
3215 mdsc
->mdsmap
= newmap
; /* first mds map */
3217 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3219 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3221 mutex_unlock(&mdsc
->mutex
);
3222 schedule_delayed(mdsc
);
3226 mutex_unlock(&mdsc
->mutex
);
3228 pr_err("error decoding mdsmap %d\n", err
);
3232 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3234 struct ceph_mds_session
*s
= con
->private;
3236 if (get_session(s
)) {
3237 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3240 dout("mdsc con_get %p FAIL\n", s
);
3244 static void con_put(struct ceph_connection
*con
)
3246 struct ceph_mds_session
*s
= con
->private;
3248 ceph_put_mds_session(s
);
3249 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
));
3253 * if the client is unresponsive for long enough, the mds will kill
3254 * the session entirely.
3256 static void peer_reset(struct ceph_connection
*con
)
3258 struct ceph_mds_session
*s
= con
->private;
3259 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3261 pr_warning("mds%d closed our session\n", s
->s_mds
);
3262 send_mds_reconnect(mdsc
, s
);
3265 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3267 struct ceph_mds_session
*s
= con
->private;
3268 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3269 int type
= le16_to_cpu(msg
->hdr
.type
);
3271 mutex_lock(&mdsc
->mutex
);
3272 if (__verify_registered_session(mdsc
, s
) < 0) {
3273 mutex_unlock(&mdsc
->mutex
);
3276 mutex_unlock(&mdsc
->mutex
);
3279 case CEPH_MSG_MDS_MAP
:
3280 ceph_mdsc_handle_map(mdsc
, msg
);
3282 case CEPH_MSG_CLIENT_SESSION
:
3283 handle_session(s
, msg
);
3285 case CEPH_MSG_CLIENT_REPLY
:
3286 handle_reply(s
, msg
);
3288 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3289 handle_forward(mdsc
, s
, msg
);
3291 case CEPH_MSG_CLIENT_CAPS
:
3292 ceph_handle_caps(s
, msg
);
3294 case CEPH_MSG_CLIENT_SNAP
:
3295 ceph_handle_snap(mdsc
, s
, msg
);
3297 case CEPH_MSG_CLIENT_LEASE
:
3298 handle_lease(mdsc
, s
, msg
);
3302 pr_err("received unknown message type %d %s\n", type
,
3303 ceph_msg_type_name(type
));
3312 static int get_authorizer(struct ceph_connection
*con
,
3313 void **buf
, int *len
, int *proto
,
3314 void **reply_buf
, int *reply_len
, int force_new
)
3316 struct ceph_mds_session
*s
= con
->private;
3317 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3318 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3321 if (force_new
&& s
->s_authorizer
) {
3322 ac
->ops
->destroy_authorizer(ac
, s
->s_authorizer
);
3323 s
->s_authorizer
= NULL
;
3325 if (s
->s_authorizer
== NULL
) {
3326 if (ac
->ops
->create_authorizer
) {
3327 ret
= ac
->ops
->create_authorizer(
3328 ac
, CEPH_ENTITY_TYPE_MDS
,
3330 &s
->s_authorizer_buf
,
3331 &s
->s_authorizer_buf_len
,
3332 &s
->s_authorizer_reply_buf
,
3333 &s
->s_authorizer_reply_buf_len
);
3339 *proto
= ac
->protocol
;
3340 *buf
= s
->s_authorizer_buf
;
3341 *len
= s
->s_authorizer_buf_len
;
3342 *reply_buf
= s
->s_authorizer_reply_buf
;
3343 *reply_len
= s
->s_authorizer_reply_buf_len
;
3348 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3350 struct ceph_mds_session
*s
= con
->private;
3351 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3352 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3354 return ac
->ops
->verify_authorizer_reply(ac
, s
->s_authorizer
, len
);
3357 static int invalidate_authorizer(struct ceph_connection
*con
)
3359 struct ceph_mds_session
*s
= con
->private;
3360 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3361 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3363 if (ac
->ops
->invalidate_authorizer
)
3364 ac
->ops
->invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3366 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3369 static const struct ceph_connection_operations mds_con_ops
= {
3372 .dispatch
= dispatch
,
3373 .get_authorizer
= get_authorizer
,
3374 .verify_authorizer_reply
= verify_authorizer_reply
,
3375 .invalidate_authorizer
= invalidate_authorizer
,
3376 .peer_reset
= peer_reset
,