1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
6 #include <linux/sched.h>
7 #include <linux/debugfs.h>
8 #include <linux/seq_file.h>
11 #include "mds_client.h"
13 #include <linux/ceph/ceph_features.h>
14 #include <linux/ceph/messenger.h>
15 #include <linux/ceph/decode.h>
16 #include <linux/ceph/pagelist.h>
17 #include <linux/ceph/auth.h>
18 #include <linux/ceph/debugfs.h>
21 * A cluster of MDS (metadata server) daemons is responsible for
22 * managing the file system namespace (the directory hierarchy and
23 * inodes) and for coordinating shared access to storage. Metadata is
24 * partitioning hierarchically across a number of servers, and that
25 * partition varies over time as the cluster adjusts the distribution
26 * in order to balance load.
28 * The MDS client is primarily responsible to managing synchronous
29 * metadata requests for operations like open, unlink, and so forth.
30 * If there is a MDS failure, we find out about it when we (possibly
31 * request and) receive a new MDS map, and can resubmit affected
34 * For the most part, though, we take advantage of a lossless
35 * communications channel to the MDS, and do not need to worry about
36 * timing out or resubmitting requests.
38 * We maintain a stateful "session" with each MDS we interact with.
39 * Within each session, we sent periodic heartbeat messages to ensure
40 * any capabilities or leases we have been issues remain valid. If
41 * the session times out and goes stale, our leases and capabilities
42 * are no longer valid.
45 struct ceph_reconnect_state
{
47 struct ceph_pagelist
*pagelist
;
51 static void __wake_requests(struct ceph_mds_client
*mdsc
,
52 struct list_head
*head
);
54 static const struct ceph_connection_operations mds_con_ops
;
62 * parse individual inode info
64 static int parse_reply_info_in(void **p
, void *end
,
65 struct ceph_mds_reply_info_in
*info
,
71 *p
+= sizeof(struct ceph_mds_reply_inode
) +
72 sizeof(*info
->in
->fragtree
.splits
) *
73 le32_to_cpu(info
->in
->fragtree
.nsplits
);
75 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
76 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
78 *p
+= info
->symlink_len
;
80 if (features
& CEPH_FEATURE_DIRLAYOUTHASH
)
81 ceph_decode_copy_safe(p
, end
, &info
->dir_layout
,
82 sizeof(info
->dir_layout
), bad
);
84 memset(&info
->dir_layout
, 0, sizeof(info
->dir_layout
));
86 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
87 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
88 info
->xattr_data
= *p
;
89 *p
+= info
->xattr_len
;
96 * parse a normal reply, which may contain a (dir+)dentry and/or a
99 static int parse_reply_info_trace(void **p
, void *end
,
100 struct ceph_mds_reply_info_parsed
*info
,
105 if (info
->head
->is_dentry
) {
106 err
= parse_reply_info_in(p
, end
, &info
->diri
, features
);
110 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
113 *p
+= sizeof(*info
->dirfrag
) +
114 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
115 if (unlikely(*p
> end
))
118 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
119 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
121 *p
+= info
->dname_len
;
123 *p
+= sizeof(*info
->dlease
);
126 if (info
->head
->is_target
) {
127 err
= parse_reply_info_in(p
, end
, &info
->targeti
, features
);
132 if (unlikely(*p
!= end
))
139 pr_err("problem parsing mds trace %d\n", err
);
144 * parse readdir results
146 static int parse_reply_info_dir(void **p
, void *end
,
147 struct ceph_mds_reply_info_parsed
*info
,
154 if (*p
+ sizeof(*info
->dir_dir
) > end
)
156 *p
+= sizeof(*info
->dir_dir
) +
157 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
161 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
162 num
= ceph_decode_32(p
);
163 info
->dir_end
= ceph_decode_8(p
);
164 info
->dir_complete
= ceph_decode_8(p
);
168 /* alloc large array */
170 info
->dir_in
= kcalloc(num
, sizeof(*info
->dir_in
) +
171 sizeof(*info
->dir_dname
) +
172 sizeof(*info
->dir_dname_len
) +
173 sizeof(*info
->dir_dlease
),
175 if (info
->dir_in
== NULL
) {
179 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
180 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
181 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
185 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
186 info
->dir_dname_len
[i
] = ceph_decode_32(p
);
187 ceph_decode_need(p
, end
, info
->dir_dname_len
[i
], bad
);
188 info
->dir_dname
[i
] = *p
;
189 *p
+= info
->dir_dname_len
[i
];
190 dout("parsed dir dname '%.*s'\n", info
->dir_dname_len
[i
],
192 info
->dir_dlease
[i
] = *p
;
193 *p
+= sizeof(struct ceph_mds_reply_lease
);
196 err
= parse_reply_info_in(p
, end
, &info
->dir_in
[i
], features
);
211 pr_err("problem parsing dir contents %d\n", err
);
216 * parse fcntl F_GETLK results
218 static int parse_reply_info_filelock(void **p
, void *end
,
219 struct ceph_mds_reply_info_parsed
*info
,
222 if (*p
+ sizeof(*info
->filelock_reply
) > end
)
225 info
->filelock_reply
= *p
;
226 *p
+= sizeof(*info
->filelock_reply
);
228 if (unlikely(*p
!= end
))
237 * parse create results
239 static int parse_reply_info_create(void **p
, void *end
,
240 struct ceph_mds_reply_info_parsed
*info
,
243 if (features
& CEPH_FEATURE_REPLY_CREATE_INODE
) {
245 info
->has_create_ino
= false;
247 info
->has_create_ino
= true;
248 info
->ino
= ceph_decode_64(p
);
252 if (unlikely(*p
!= end
))
261 * parse extra results
263 static int parse_reply_info_extra(void **p
, void *end
,
264 struct ceph_mds_reply_info_parsed
*info
,
267 if (info
->head
->op
== CEPH_MDS_OP_GETFILELOCK
)
268 return parse_reply_info_filelock(p
, end
, info
, features
);
269 else if (info
->head
->op
== CEPH_MDS_OP_READDIR
||
270 info
->head
->op
== CEPH_MDS_OP_LSSNAP
)
271 return parse_reply_info_dir(p
, end
, info
, features
);
272 else if (info
->head
->op
== CEPH_MDS_OP_CREATE
)
273 return parse_reply_info_create(p
, end
, info
, features
);
279 * parse entire mds reply
281 static int parse_reply_info(struct ceph_msg
*msg
,
282 struct ceph_mds_reply_info_parsed
*info
,
289 info
->head
= msg
->front
.iov_base
;
290 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
291 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
294 ceph_decode_32_safe(&p
, end
, len
, bad
);
296 ceph_decode_need(&p
, end
, len
, bad
);
297 err
= parse_reply_info_trace(&p
, p
+len
, info
, features
);
303 ceph_decode_32_safe(&p
, end
, len
, bad
);
305 ceph_decode_need(&p
, end
, len
, bad
);
306 err
= parse_reply_info_extra(&p
, p
+len
, info
, features
);
312 ceph_decode_32_safe(&p
, end
, len
, bad
);
313 info
->snapblob_len
= len
;
324 pr_err("mds parse_reply err %d\n", err
);
328 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
337 static const char *session_state_name(int s
)
340 case CEPH_MDS_SESSION_NEW
: return "new";
341 case CEPH_MDS_SESSION_OPENING
: return "opening";
342 case CEPH_MDS_SESSION_OPEN
: return "open";
343 case CEPH_MDS_SESSION_HUNG
: return "hung";
344 case CEPH_MDS_SESSION_CLOSING
: return "closing";
345 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
346 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
347 default: return "???";
351 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
353 if (atomic_inc_not_zero(&s
->s_ref
)) {
354 dout("mdsc get_session %p %d -> %d\n", s
,
355 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
358 dout("mdsc get_session %p 0 -- FAIL", s
);
363 void ceph_put_mds_session(struct ceph_mds_session
*s
)
365 dout("mdsc put_session %p %d -> %d\n", s
,
366 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
367 if (atomic_dec_and_test(&s
->s_ref
)) {
368 if (s
->s_auth
.authorizer
)
369 ceph_auth_destroy_authorizer(
370 s
->s_mdsc
->fsc
->client
->monc
.auth
,
371 s
->s_auth
.authorizer
);
377 * called under mdsc->mutex
379 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
382 struct ceph_mds_session
*session
;
384 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
386 session
= mdsc
->sessions
[mds
];
387 dout("lookup_mds_session %p %d\n", session
,
388 atomic_read(&session
->s_ref
));
389 get_session(session
);
393 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
395 if (mds
>= mdsc
->max_sessions
)
397 return mdsc
->sessions
[mds
];
400 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
401 struct ceph_mds_session
*s
)
403 if (s
->s_mds
>= mdsc
->max_sessions
||
404 mdsc
->sessions
[s
->s_mds
] != s
)
410 * create+register a new session for given mds.
411 * called under mdsc->mutex.
413 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
416 struct ceph_mds_session
*s
;
418 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
419 return ERR_PTR(-EINVAL
);
421 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
423 return ERR_PTR(-ENOMEM
);
426 s
->s_state
= CEPH_MDS_SESSION_NEW
;
429 mutex_init(&s
->s_mutex
);
431 ceph_con_init(&s
->s_con
, s
, &mds_con_ops
, &mdsc
->fsc
->client
->msgr
);
433 spin_lock_init(&s
->s_gen_ttl_lock
);
435 s
->s_cap_ttl
= jiffies
- 1;
437 spin_lock_init(&s
->s_cap_lock
);
438 s
->s_renew_requested
= 0;
440 INIT_LIST_HEAD(&s
->s_caps
);
443 atomic_set(&s
->s_ref
, 1);
444 INIT_LIST_HEAD(&s
->s_waiting
);
445 INIT_LIST_HEAD(&s
->s_unsafe
);
446 s
->s_num_cap_releases
= 0;
447 s
->s_cap_reconnect
= 0;
448 s
->s_cap_iterator
= NULL
;
449 INIT_LIST_HEAD(&s
->s_cap_releases
);
450 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
451 INIT_LIST_HEAD(&s
->s_cap_flushing
);
452 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
454 dout("register_session mds%d\n", mds
);
455 if (mds
>= mdsc
->max_sessions
) {
456 int newmax
= 1 << get_count_order(mds
+1);
457 struct ceph_mds_session
**sa
;
459 dout("register_session realloc to %d\n", newmax
);
460 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
463 if (mdsc
->sessions
) {
464 memcpy(sa
, mdsc
->sessions
,
465 mdsc
->max_sessions
* sizeof(void *));
466 kfree(mdsc
->sessions
);
469 mdsc
->max_sessions
= newmax
;
471 mdsc
->sessions
[mds
] = s
;
472 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
474 ceph_con_open(&s
->s_con
, CEPH_ENTITY_TYPE_MDS
, mds
,
475 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
481 return ERR_PTR(-ENOMEM
);
485 * called under mdsc->mutex
487 static void __unregister_session(struct ceph_mds_client
*mdsc
,
488 struct ceph_mds_session
*s
)
490 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
491 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
492 mdsc
->sessions
[s
->s_mds
] = NULL
;
493 ceph_con_close(&s
->s_con
);
494 ceph_put_mds_session(s
);
498 * drop session refs in request.
500 * should be last request ref, or hold mdsc->mutex
502 static void put_request_session(struct ceph_mds_request
*req
)
504 if (req
->r_session
) {
505 ceph_put_mds_session(req
->r_session
);
506 req
->r_session
= NULL
;
510 void ceph_mdsc_release_request(struct kref
*kref
)
512 struct ceph_mds_request
*req
= container_of(kref
,
513 struct ceph_mds_request
,
516 ceph_msg_put(req
->r_request
);
518 ceph_msg_put(req
->r_reply
);
519 destroy_reply_info(&req
->r_reply_info
);
522 ceph_put_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
525 if (req
->r_locked_dir
)
526 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
527 if (req
->r_target_inode
)
528 iput(req
->r_target_inode
);
531 if (req
->r_old_dentry
) {
533 * track (and drop pins for) r_old_dentry_dir
534 * separately, since r_old_dentry's d_parent may have
535 * changed between the dir mutex being dropped and
536 * this request being freed.
538 ceph_put_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
540 dput(req
->r_old_dentry
);
541 iput(req
->r_old_dentry_dir
);
545 put_request_session(req
);
546 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
551 * lookup session, bump ref if found.
553 * called under mdsc->mutex.
555 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
558 struct ceph_mds_request
*req
;
559 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
562 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
563 if (tid
< req
->r_tid
)
565 else if (tid
> req
->r_tid
)
568 ceph_mdsc_get_request(req
);
575 static void __insert_request(struct ceph_mds_client
*mdsc
,
576 struct ceph_mds_request
*new)
578 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
579 struct rb_node
*parent
= NULL
;
580 struct ceph_mds_request
*req
= NULL
;
584 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
585 if (new->r_tid
< req
->r_tid
)
587 else if (new->r_tid
> req
->r_tid
)
593 rb_link_node(&new->r_node
, parent
, p
);
594 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
601 * Called under mdsc->mutex.
603 static void __register_request(struct ceph_mds_client
*mdsc
,
604 struct ceph_mds_request
*req
,
607 req
->r_tid
= ++mdsc
->last_tid
;
609 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
611 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
612 ceph_mdsc_get_request(req
);
613 __insert_request(mdsc
, req
);
615 req
->r_uid
= current_fsuid();
616 req
->r_gid
= current_fsgid();
619 struct ceph_inode_info
*ci
= ceph_inode(dir
);
622 spin_lock(&ci
->i_unsafe_lock
);
623 req
->r_unsafe_dir
= dir
;
624 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
625 spin_unlock(&ci
->i_unsafe_lock
);
629 static void __unregister_request(struct ceph_mds_client
*mdsc
,
630 struct ceph_mds_request
*req
)
632 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
633 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
634 RB_CLEAR_NODE(&req
->r_node
);
636 if (req
->r_unsafe_dir
) {
637 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
639 spin_lock(&ci
->i_unsafe_lock
);
640 list_del_init(&req
->r_unsafe_dir_item
);
641 spin_unlock(&ci
->i_unsafe_lock
);
643 iput(req
->r_unsafe_dir
);
644 req
->r_unsafe_dir
= NULL
;
647 complete_all(&req
->r_safe_completion
);
649 ceph_mdsc_put_request(req
);
653 * Choose mds to send request to next. If there is a hint set in the
654 * request (e.g., due to a prior forward hint from the mds), use that.
655 * Otherwise, consult frag tree and/or caps to identify the
656 * appropriate mds. If all else fails, choose randomly.
658 * Called under mdsc->mutex.
660 static struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
663 * we don't need to worry about protecting the d_parent access
664 * here because we never renaming inside the snapped namespace
665 * except to resplice to another snapdir, and either the old or new
666 * result is a valid result.
668 while (!IS_ROOT(dentry
) && ceph_snap(dentry
->d_inode
) != CEPH_NOSNAP
)
669 dentry
= dentry
->d_parent
;
673 static int __choose_mds(struct ceph_mds_client
*mdsc
,
674 struct ceph_mds_request
*req
)
677 struct ceph_inode_info
*ci
;
678 struct ceph_cap
*cap
;
679 int mode
= req
->r_direct_mode
;
681 u32 hash
= req
->r_direct_hash
;
682 bool is_hash
= req
->r_direct_is_hash
;
685 * is there a specific mds we should try? ignore hint if we have
686 * no session and the mds is not up (active or recovering).
688 if (req
->r_resend_mds
>= 0 &&
689 (__have_session(mdsc
, req
->r_resend_mds
) ||
690 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
691 dout("choose_mds using resend_mds mds%d\n",
693 return req
->r_resend_mds
;
696 if (mode
== USE_RANDOM_MDS
)
701 inode
= req
->r_inode
;
702 } else if (req
->r_dentry
) {
703 /* ignore race with rename; old or new d_parent is okay */
704 struct dentry
*parent
= req
->r_dentry
->d_parent
;
705 struct inode
*dir
= parent
->d_inode
;
707 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
709 inode
= req
->r_dentry
->d_inode
;
710 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
711 /* direct snapped/virtual snapdir requests
712 * based on parent dir inode */
713 struct dentry
*dn
= get_nonsnap_parent(parent
);
715 dout("__choose_mds using nonsnap parent %p\n", inode
);
716 } else if (req
->r_dentry
->d_inode
) {
718 inode
= req
->r_dentry
->d_inode
;
722 hash
= ceph_dentry_hash(dir
, req
->r_dentry
);
727 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
731 ci
= ceph_inode(inode
);
733 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
734 struct ceph_inode_frag frag
;
737 ceph_choose_frag(ci
, hash
, &frag
, &found
);
739 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
742 /* choose a random replica */
743 get_random_bytes(&r
, 1);
746 dout("choose_mds %p %llx.%llx "
747 "frag %u mds%d (%d/%d)\n",
748 inode
, ceph_vinop(inode
),
751 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
752 CEPH_MDS_STATE_ACTIVE
)
756 /* since this file/dir wasn't known to be
757 * replicated, then we want to look for the
758 * authoritative mds. */
761 /* choose auth mds */
763 dout("choose_mds %p %llx.%llx "
764 "frag %u mds%d (auth)\n",
765 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
766 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
767 CEPH_MDS_STATE_ACTIVE
)
773 spin_lock(&ci
->i_ceph_lock
);
775 if (mode
== USE_AUTH_MDS
)
776 cap
= ci
->i_auth_cap
;
777 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
778 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
780 spin_unlock(&ci
->i_ceph_lock
);
783 mds
= cap
->session
->s_mds
;
784 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
785 inode
, ceph_vinop(inode
), mds
,
786 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
787 spin_unlock(&ci
->i_ceph_lock
);
791 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
792 dout("choose_mds chose random mds%d\n", mds
);
800 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
802 struct ceph_msg
*msg
;
803 struct ceph_mds_session_head
*h
;
805 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
,
808 pr_err("create_session_msg ENOMEM creating msg\n");
811 h
= msg
->front
.iov_base
;
812 h
->op
= cpu_to_le32(op
);
813 h
->seq
= cpu_to_le64(seq
);
818 * send session open request.
820 * called under mdsc->mutex
822 static int __open_session(struct ceph_mds_client
*mdsc
,
823 struct ceph_mds_session
*session
)
825 struct ceph_msg
*msg
;
827 int mds
= session
->s_mds
;
829 /* wait for mds to go active? */
830 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
831 dout("open_session to mds%d (%s)\n", mds
,
832 ceph_mds_state_name(mstate
));
833 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
834 session
->s_renew_requested
= jiffies
;
836 /* send connect message */
837 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
840 ceph_con_send(&session
->s_con
, msg
);
845 * open sessions for any export targets for the given mds
847 * called under mdsc->mutex
849 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
850 struct ceph_mds_session
*session
)
852 struct ceph_mds_info
*mi
;
853 struct ceph_mds_session
*ts
;
854 int i
, mds
= session
->s_mds
;
857 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
859 mi
= &mdsc
->mdsmap
->m_info
[mds
];
860 dout("open_export_target_sessions for mds%d (%d targets)\n",
861 session
->s_mds
, mi
->num_export_targets
);
863 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
864 target
= mi
->export_targets
[i
];
865 ts
= __ceph_lookup_mds_session(mdsc
, target
);
867 ts
= register_session(mdsc
, target
);
871 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
872 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
873 __open_session(mdsc
, session
);
875 dout(" mds%d target mds%d %p is %s\n", session
->s_mds
,
876 i
, ts
, session_state_name(ts
->s_state
));
877 ceph_put_mds_session(ts
);
881 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
882 struct ceph_mds_session
*session
)
884 mutex_lock(&mdsc
->mutex
);
885 __open_export_target_sessions(mdsc
, session
);
886 mutex_unlock(&mdsc
->mutex
);
894 * Free preallocated cap messages assigned to this session
896 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
898 struct ceph_msg
*msg
;
900 spin_lock(&session
->s_cap_lock
);
901 while (!list_empty(&session
->s_cap_releases
)) {
902 msg
= list_first_entry(&session
->s_cap_releases
,
903 struct ceph_msg
, list_head
);
904 list_del_init(&msg
->list_head
);
907 while (!list_empty(&session
->s_cap_releases_done
)) {
908 msg
= list_first_entry(&session
->s_cap_releases_done
,
909 struct ceph_msg
, list_head
);
910 list_del_init(&msg
->list_head
);
913 spin_unlock(&session
->s_cap_lock
);
917 * Helper to safely iterate over all caps associated with a session, with
918 * special care taken to handle a racing __ceph_remove_cap().
920 * Caller must hold session s_mutex.
922 static int iterate_session_caps(struct ceph_mds_session
*session
,
923 int (*cb
)(struct inode
*, struct ceph_cap
*,
927 struct ceph_cap
*cap
;
928 struct inode
*inode
, *last_inode
= NULL
;
929 struct ceph_cap
*old_cap
= NULL
;
932 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
933 spin_lock(&session
->s_cap_lock
);
934 p
= session
->s_caps
.next
;
935 while (p
!= &session
->s_caps
) {
936 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
937 inode
= igrab(&cap
->ci
->vfs_inode
);
942 session
->s_cap_iterator
= cap
;
943 spin_unlock(&session
->s_cap_lock
);
950 ceph_put_cap(session
->s_mdsc
, old_cap
);
954 ret
= cb(inode
, cap
, arg
);
957 spin_lock(&session
->s_cap_lock
);
959 if (cap
->ci
== NULL
) {
960 dout("iterate_session_caps finishing cap %p removal\n",
962 BUG_ON(cap
->session
!= session
);
963 list_del_init(&cap
->session_caps
);
964 session
->s_nr_caps
--;
966 old_cap
= cap
; /* put_cap it w/o locks held */
973 session
->s_cap_iterator
= NULL
;
974 spin_unlock(&session
->s_cap_lock
);
979 ceph_put_cap(session
->s_mdsc
, old_cap
);
984 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
987 struct ceph_inode_info
*ci
= ceph_inode(inode
);
990 dout("removing cap %p, ci is %p, inode is %p\n",
991 cap
, ci
, &ci
->vfs_inode
);
992 spin_lock(&ci
->i_ceph_lock
);
993 __ceph_remove_cap(cap
, false);
994 if (!__ceph_is_any_real_caps(ci
)) {
995 struct ceph_mds_client
*mdsc
=
996 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
998 spin_lock(&mdsc
->cap_dirty_lock
);
999 if (!list_empty(&ci
->i_dirty_item
)) {
1000 pr_info(" dropping dirty %s state for %p %lld\n",
1001 ceph_cap_string(ci
->i_dirty_caps
),
1002 inode
, ceph_ino(inode
));
1003 ci
->i_dirty_caps
= 0;
1004 list_del_init(&ci
->i_dirty_item
);
1007 if (!list_empty(&ci
->i_flushing_item
)) {
1008 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1009 ceph_cap_string(ci
->i_flushing_caps
),
1010 inode
, ceph_ino(inode
));
1011 ci
->i_flushing_caps
= 0;
1012 list_del_init(&ci
->i_flushing_item
);
1013 mdsc
->num_cap_flushing
--;
1016 if (drop
&& ci
->i_wrbuffer_ref
) {
1017 pr_info(" dropping dirty data for %p %lld\n",
1018 inode
, ceph_ino(inode
));
1019 ci
->i_wrbuffer_ref
= 0;
1020 ci
->i_wrbuffer_ref_head
= 0;
1023 spin_unlock(&mdsc
->cap_dirty_lock
);
1025 spin_unlock(&ci
->i_ceph_lock
);
1032 * caller must hold session s_mutex
1034 static void remove_session_caps(struct ceph_mds_session
*session
)
1036 dout("remove_session_caps on %p\n", session
);
1037 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
1039 spin_lock(&session
->s_cap_lock
);
1040 if (session
->s_nr_caps
> 0) {
1041 struct super_block
*sb
= session
->s_mdsc
->fsc
->sb
;
1042 struct inode
*inode
;
1043 struct ceph_cap
*cap
, *prev
= NULL
;
1044 struct ceph_vino vino
;
1046 * iterate_session_caps() skips inodes that are being
1047 * deleted, we need to wait until deletions are complete.
1048 * __wait_on_freeing_inode() is designed for the job,
1049 * but it is not exported, so use lookup inode function
1052 while (!list_empty(&session
->s_caps
)) {
1053 cap
= list_entry(session
->s_caps
.next
,
1054 struct ceph_cap
, session_caps
);
1058 vino
= cap
->ci
->i_vino
;
1059 spin_unlock(&session
->s_cap_lock
);
1061 inode
= ceph_find_inode(sb
, vino
);
1064 spin_lock(&session
->s_cap_lock
);
1067 spin_unlock(&session
->s_cap_lock
);
1069 BUG_ON(session
->s_nr_caps
> 0);
1070 BUG_ON(!list_empty(&session
->s_cap_flushing
));
1071 cleanup_cap_releases(session
);
1075 * wake up any threads waiting on this session's caps. if the cap is
1076 * old (didn't get renewed on the client reconnect), remove it now.
1078 * caller must hold s_mutex.
1080 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1083 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1085 wake_up_all(&ci
->i_cap_wq
);
1087 spin_lock(&ci
->i_ceph_lock
);
1088 ci
->i_wanted_max_size
= 0;
1089 ci
->i_requested_max_size
= 0;
1090 spin_unlock(&ci
->i_ceph_lock
);
1095 static void wake_up_session_caps(struct ceph_mds_session
*session
,
1098 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
1099 iterate_session_caps(session
, wake_up_session_cb
,
1100 (void *)(unsigned long)reconnect
);
1104 * Send periodic message to MDS renewing all currently held caps. The
1105 * ack will reset the expiration for all caps from this session.
1107 * caller holds s_mutex
1109 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
1110 struct ceph_mds_session
*session
)
1112 struct ceph_msg
*msg
;
1115 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
1116 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
1117 pr_info("mds%d caps stale\n", session
->s_mds
);
1118 session
->s_renew_requested
= jiffies
;
1120 /* do not try to renew caps until a recovering mds has reconnected
1121 * with its clients. */
1122 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
1123 if (state
< CEPH_MDS_STATE_RECONNECT
) {
1124 dout("send_renew_caps ignoring mds%d (%s)\n",
1125 session
->s_mds
, ceph_mds_state_name(state
));
1129 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
1130 ceph_mds_state_name(state
));
1131 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
1132 ++session
->s_renew_seq
);
1135 ceph_con_send(&session
->s_con
, msg
);
1140 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1142 * Called under session->s_mutex
1144 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1145 struct ceph_mds_session
*session
, int is_renew
)
1150 spin_lock(&session
->s_cap_lock
);
1151 was_stale
= is_renew
&& time_after_eq(jiffies
, session
->s_cap_ttl
);
1153 session
->s_cap_ttl
= session
->s_renew_requested
+
1154 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1157 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1158 pr_info("mds%d caps renewed\n", session
->s_mds
);
1161 pr_info("mds%d caps still stale\n", session
->s_mds
);
1164 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1165 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1166 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1167 spin_unlock(&session
->s_cap_lock
);
1170 wake_up_session_caps(session
, 0);
1174 * send a session close request
1176 static int request_close_session(struct ceph_mds_client
*mdsc
,
1177 struct ceph_mds_session
*session
)
1179 struct ceph_msg
*msg
;
1181 dout("request_close_session mds%d state %s seq %lld\n",
1182 session
->s_mds
, session_state_name(session
->s_state
),
1184 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1187 ceph_con_send(&session
->s_con
, msg
);
1192 * Called with s_mutex held.
1194 static int __close_session(struct ceph_mds_client
*mdsc
,
1195 struct ceph_mds_session
*session
)
1197 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1199 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1200 return request_close_session(mdsc
, session
);
1204 * Trim old(er) caps.
1206 * Because we can't cache an inode without one or more caps, we do
1207 * this indirectly: if a cap is unused, we prune its aliases, at which
1208 * point the inode will hopefully get dropped to.
1210 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1211 * memory pressure from the MDS, though, so it needn't be perfect.
1213 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1215 struct ceph_mds_session
*session
= arg
;
1216 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1217 int used
, oissued
, mine
;
1219 if (session
->s_trim_caps
<= 0)
1222 spin_lock(&ci
->i_ceph_lock
);
1223 mine
= cap
->issued
| cap
->implemented
;
1224 used
= __ceph_caps_used(ci
);
1225 oissued
= __ceph_caps_issued_other(ci
, cap
);
1227 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1228 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1229 ceph_cap_string(used
));
1230 if (ci
->i_dirty_caps
)
1231 goto out
; /* dirty caps */
1232 if ((used
& ~oissued
) & mine
)
1233 goto out
; /* we need these caps */
1235 session
->s_trim_caps
--;
1237 /* we aren't the only cap.. just remove us */
1238 __ceph_remove_cap(cap
, true);
1240 /* try to drop referring dentries */
1241 spin_unlock(&ci
->i_ceph_lock
);
1242 d_prune_aliases(inode
);
1243 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1244 inode
, cap
, atomic_read(&inode
->i_count
));
1249 spin_unlock(&ci
->i_ceph_lock
);
1254 * Trim session cap count down to some max number.
1256 static int trim_caps(struct ceph_mds_client
*mdsc
,
1257 struct ceph_mds_session
*session
,
1260 int trim_caps
= session
->s_nr_caps
- max_caps
;
1262 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1263 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1264 if (trim_caps
> 0) {
1265 session
->s_trim_caps
= trim_caps
;
1266 iterate_session_caps(session
, trim_caps_cb
, session
);
1267 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1268 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1269 trim_caps
- session
->s_trim_caps
);
1270 session
->s_trim_caps
= 0;
1276 * Allocate cap_release messages. If there is a partially full message
1277 * in the queue, try to allocate enough to cover it's remainder, so that
1278 * we can send it immediately.
1280 * Called under s_mutex.
1282 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1283 struct ceph_mds_session
*session
)
1285 struct ceph_msg
*msg
, *partial
= NULL
;
1286 struct ceph_mds_cap_release
*head
;
1288 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1291 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1294 spin_lock(&session
->s_cap_lock
);
1296 if (!list_empty(&session
->s_cap_releases
)) {
1297 msg
= list_first_entry(&session
->s_cap_releases
,
1300 head
= msg
->front
.iov_base
;
1301 num
= le32_to_cpu(head
->num
);
1303 dout(" partial %p with (%d/%d)\n", msg
, num
,
1304 (int)CEPH_CAPS_PER_RELEASE
);
1305 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1309 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1310 spin_unlock(&session
->s_cap_lock
);
1311 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1315 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1316 (int)msg
->front
.iov_len
);
1317 head
= msg
->front
.iov_base
;
1318 head
->num
= cpu_to_le32(0);
1319 msg
->front
.iov_len
= sizeof(*head
);
1320 spin_lock(&session
->s_cap_lock
);
1321 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1322 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1326 head
= partial
->front
.iov_base
;
1327 num
= le32_to_cpu(head
->num
);
1328 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1329 (int)CEPH_CAPS_PER_RELEASE
);
1330 list_move_tail(&partial
->list_head
,
1331 &session
->s_cap_releases_done
);
1332 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1335 spin_unlock(&session
->s_cap_lock
);
1341 * flush all dirty inode data to disk.
1343 * returns true if we've flushed through want_flush_seq
1345 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1349 dout("check_cap_flush want %lld\n", want_flush_seq
);
1350 mutex_lock(&mdsc
->mutex
);
1351 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1352 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1356 get_session(session
);
1357 mutex_unlock(&mdsc
->mutex
);
1359 mutex_lock(&session
->s_mutex
);
1360 if (!list_empty(&session
->s_cap_flushing
)) {
1361 struct ceph_inode_info
*ci
=
1362 list_entry(session
->s_cap_flushing
.next
,
1363 struct ceph_inode_info
,
1365 struct inode
*inode
= &ci
->vfs_inode
;
1367 spin_lock(&ci
->i_ceph_lock
);
1368 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1369 dout("check_cap_flush still flushing %p "
1370 "seq %lld <= %lld to mds%d\n", inode
,
1371 ci
->i_cap_flush_seq
, want_flush_seq
,
1375 spin_unlock(&ci
->i_ceph_lock
);
1377 mutex_unlock(&session
->s_mutex
);
1378 ceph_put_mds_session(session
);
1382 mutex_lock(&mdsc
->mutex
);
1385 mutex_unlock(&mdsc
->mutex
);
1386 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1391 * called under s_mutex
1393 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1394 struct ceph_mds_session
*session
)
1396 struct ceph_msg
*msg
;
1398 dout("send_cap_releases mds%d\n", session
->s_mds
);
1399 spin_lock(&session
->s_cap_lock
);
1400 while (!list_empty(&session
->s_cap_releases_done
)) {
1401 msg
= list_first_entry(&session
->s_cap_releases_done
,
1402 struct ceph_msg
, list_head
);
1403 list_del_init(&msg
->list_head
);
1404 spin_unlock(&session
->s_cap_lock
);
1405 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1406 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1407 ceph_con_send(&session
->s_con
, msg
);
1408 spin_lock(&session
->s_cap_lock
);
1410 spin_unlock(&session
->s_cap_lock
);
1413 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1414 struct ceph_mds_session
*session
)
1416 struct ceph_msg
*msg
;
1417 struct ceph_mds_cap_release
*head
;
1420 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1422 /* zero out the in-progress message */
1423 msg
= list_first_entry(&session
->s_cap_releases
,
1424 struct ceph_msg
, list_head
);
1425 head
= msg
->front
.iov_base
;
1426 num
= le32_to_cpu(head
->num
);
1427 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
, num
);
1428 head
->num
= cpu_to_le32(0);
1429 msg
->front
.iov_len
= sizeof(*head
);
1430 session
->s_num_cap_releases
+= num
;
1432 /* requeue completed messages */
1433 while (!list_empty(&session
->s_cap_releases_done
)) {
1434 msg
= list_first_entry(&session
->s_cap_releases_done
,
1435 struct ceph_msg
, list_head
);
1436 list_del_init(&msg
->list_head
);
1438 head
= msg
->front
.iov_base
;
1439 num
= le32_to_cpu(head
->num
);
1440 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1442 session
->s_num_cap_releases
+= num
;
1443 head
->num
= cpu_to_le32(0);
1444 msg
->front
.iov_len
= sizeof(*head
);
1445 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1454 * Create an mds request.
1456 struct ceph_mds_request
*
1457 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1459 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1462 return ERR_PTR(-ENOMEM
);
1464 mutex_init(&req
->r_fill_mutex
);
1466 req
->r_started
= jiffies
;
1467 req
->r_resend_mds
= -1;
1468 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1470 kref_init(&req
->r_kref
);
1471 INIT_LIST_HEAD(&req
->r_wait
);
1472 init_completion(&req
->r_completion
);
1473 init_completion(&req
->r_safe_completion
);
1474 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1477 req
->r_direct_mode
= mode
;
1482 * return oldest (lowest) request, tid in request tree, 0 if none.
1484 * called under mdsc->mutex.
1486 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1488 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1490 return rb_entry(rb_first(&mdsc
->request_tree
),
1491 struct ceph_mds_request
, r_node
);
1494 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1496 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1504 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1505 * on build_path_from_dentry in fs/cifs/dir.c.
1507 * If @stop_on_nosnap, generate path relative to the first non-snapped
1510 * Encode hidden .snap dirs as a double /, i.e.
1511 * foo/.snap/bar -> foo//bar
1513 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1516 struct dentry
*temp
;
1522 return ERR_PTR(-EINVAL
);
1526 seq
= read_seqbegin(&rename_lock
);
1528 for (temp
= dentry
; !IS_ROOT(temp
);) {
1529 struct inode
*inode
= temp
->d_inode
;
1530 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1531 len
++; /* slash only */
1532 else if (stop_on_nosnap
&& inode
&&
1533 ceph_snap(inode
) == CEPH_NOSNAP
)
1536 len
+= 1 + temp
->d_name
.len
;
1537 temp
= temp
->d_parent
;
1541 len
--; /* no leading '/' */
1543 path
= kmalloc(len
+1, GFP_NOFS
);
1545 return ERR_PTR(-ENOMEM
);
1547 path
[pos
] = 0; /* trailing null */
1549 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1550 struct inode
*inode
;
1552 spin_lock(&temp
->d_lock
);
1553 inode
= temp
->d_inode
;
1554 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1555 dout("build_path path+%d: %p SNAPDIR\n",
1557 } else if (stop_on_nosnap
&& inode
&&
1558 ceph_snap(inode
) == CEPH_NOSNAP
) {
1559 spin_unlock(&temp
->d_lock
);
1562 pos
-= temp
->d_name
.len
;
1564 spin_unlock(&temp
->d_lock
);
1567 strncpy(path
+ pos
, temp
->d_name
.name
,
1570 spin_unlock(&temp
->d_lock
);
1573 temp
= temp
->d_parent
;
1576 if (pos
!= 0 || read_seqretry(&rename_lock
, seq
)) {
1577 pr_err("build_path did not end path lookup where "
1578 "expected, namelen is %d, pos is %d\n", len
, pos
);
1579 /* presumably this is only possible if racing with a
1580 rename of one of the parent directories (we can not
1581 lock the dentries above us to prevent this, but
1582 retrying should be harmless) */
1587 *base
= ceph_ino(temp
->d_inode
);
1589 dout("build_path on %p %d built %llx '%.*s'\n",
1590 dentry
, d_count(dentry
), *base
, len
, path
);
1594 static int build_dentry_path(struct dentry
*dentry
,
1595 const char **ppath
, int *ppathlen
, u64
*pino
,
1600 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1601 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1602 *ppath
= dentry
->d_name
.name
;
1603 *ppathlen
= dentry
->d_name
.len
;
1606 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1608 return PTR_ERR(path
);
1614 static int build_inode_path(struct inode
*inode
,
1615 const char **ppath
, int *ppathlen
, u64
*pino
,
1618 struct dentry
*dentry
;
1621 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1622 *pino
= ceph_ino(inode
);
1626 dentry
= d_find_alias(inode
);
1627 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1630 return PTR_ERR(path
);
1637 * request arguments may be specified via an inode *, a dentry *, or
1638 * an explicit ino+path.
1640 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1641 const char *rpath
, u64 rino
,
1642 const char **ppath
, int *pathlen
,
1643 u64
*ino
, int *freepath
)
1648 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1649 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1651 } else if (rdentry
) {
1652 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1653 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1655 } else if (rpath
|| rino
) {
1658 *pathlen
= rpath
? strlen(rpath
) : 0;
1659 dout(" path %.*s\n", *pathlen
, rpath
);
1666 * called under mdsc->mutex
1668 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1669 struct ceph_mds_request
*req
,
1672 struct ceph_msg
*msg
;
1673 struct ceph_mds_request_head
*head
;
1674 const char *path1
= NULL
;
1675 const char *path2
= NULL
;
1676 u64 ino1
= 0, ino2
= 0;
1677 int pathlen1
= 0, pathlen2
= 0;
1678 int freepath1
= 0, freepath2
= 0;
1684 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1685 req
->r_path1
, req
->r_ino1
.ino
,
1686 &path1
, &pathlen1
, &ino1
, &freepath1
);
1692 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1693 req
->r_path2
, req
->r_ino2
.ino
,
1694 &path2
, &pathlen2
, &ino2
, &freepath2
);
1700 len
= sizeof(*head
) +
1701 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1703 /* calculate (max) length for cap releases */
1704 len
+= sizeof(struct ceph_mds_request_release
) *
1705 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1706 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1707 if (req
->r_dentry_drop
)
1708 len
+= req
->r_dentry
->d_name
.len
;
1709 if (req
->r_old_dentry_drop
)
1710 len
+= req
->r_old_dentry
->d_name
.len
;
1712 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
, false);
1714 msg
= ERR_PTR(-ENOMEM
);
1718 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1720 head
= msg
->front
.iov_base
;
1721 p
= msg
->front
.iov_base
+ sizeof(*head
);
1722 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1724 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1725 head
->op
= cpu_to_le32(req
->r_op
);
1726 head
->caller_uid
= cpu_to_le32(from_kuid(&init_user_ns
, req
->r_uid
));
1727 head
->caller_gid
= cpu_to_le32(from_kgid(&init_user_ns
, req
->r_gid
));
1728 head
->args
= req
->r_args
;
1730 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1731 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1733 /* make note of release offset, in case we need to replay */
1734 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1738 if (req
->r_inode_drop
)
1739 releases
+= ceph_encode_inode_release(&p
,
1740 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1741 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1742 if (req
->r_dentry_drop
)
1743 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1744 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1745 if (req
->r_old_dentry_drop
)
1746 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1747 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1748 if (req
->r_old_inode_drop
)
1749 releases
+= ceph_encode_inode_release(&p
,
1750 req
->r_old_dentry
->d_inode
,
1751 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1752 head
->num_releases
= cpu_to_le16(releases
);
1755 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1756 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1758 if (req
->r_data_len
) {
1759 /* outbound data set only by ceph_sync_setxattr() */
1760 BUG_ON(!req
->r_pages
);
1761 ceph_msg_data_add_pages(msg
, req
->r_pages
, req
->r_data_len
, 0);
1764 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1765 msg
->hdr
.data_off
= cpu_to_le16(0);
1769 kfree((char *)path2
);
1772 kfree((char *)path1
);
1778 * called under mdsc->mutex if error, under no mutex if
1781 static void complete_request(struct ceph_mds_client
*mdsc
,
1782 struct ceph_mds_request
*req
)
1784 if (req
->r_callback
)
1785 req
->r_callback(mdsc
, req
);
1787 complete_all(&req
->r_completion
);
1791 * called under mdsc->mutex
1793 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1794 struct ceph_mds_request
*req
,
1797 struct ceph_mds_request_head
*rhead
;
1798 struct ceph_msg
*msg
;
1803 struct ceph_cap
*cap
=
1804 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
1807 req
->r_sent_on_mseq
= cap
->mseq
;
1809 req
->r_sent_on_mseq
= -1;
1811 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1812 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1814 if (req
->r_got_unsafe
) {
1816 * Replay. Do not regenerate message (and rebuild
1817 * paths, etc.); just use the original message.
1818 * Rebuilding paths will break for renames because
1819 * d_move mangles the src name.
1821 msg
= req
->r_request
;
1822 rhead
= msg
->front
.iov_base
;
1824 flags
= le32_to_cpu(rhead
->flags
);
1825 flags
|= CEPH_MDS_FLAG_REPLAY
;
1826 rhead
->flags
= cpu_to_le32(flags
);
1828 if (req
->r_target_inode
)
1829 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1831 rhead
->num_retry
= req
->r_attempts
- 1;
1833 /* remove cap/dentry releases from message */
1834 rhead
->num_releases
= 0;
1835 msg
->hdr
.front_len
= cpu_to_le32(req
->r_request_release_offset
);
1836 msg
->front
.iov_len
= req
->r_request_release_offset
;
1840 if (req
->r_request
) {
1841 ceph_msg_put(req
->r_request
);
1842 req
->r_request
= NULL
;
1844 msg
= create_request_message(mdsc
, req
, mds
);
1846 req
->r_err
= PTR_ERR(msg
);
1847 complete_request(mdsc
, req
);
1848 return PTR_ERR(msg
);
1850 req
->r_request
= msg
;
1852 rhead
= msg
->front
.iov_base
;
1853 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1854 if (req
->r_got_unsafe
)
1855 flags
|= CEPH_MDS_FLAG_REPLAY
;
1856 if (req
->r_locked_dir
)
1857 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1858 rhead
->flags
= cpu_to_le32(flags
);
1859 rhead
->num_fwd
= req
->r_num_fwd
;
1860 rhead
->num_retry
= req
->r_attempts
- 1;
1863 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1868 * send request, or put it on the appropriate wait list.
1870 static int __do_request(struct ceph_mds_client
*mdsc
,
1871 struct ceph_mds_request
*req
)
1873 struct ceph_mds_session
*session
= NULL
;
1877 if (req
->r_err
|| req
->r_got_result
) {
1879 __unregister_request(mdsc
, req
);
1883 if (req
->r_timeout
&&
1884 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1885 dout("do_request timed out\n");
1890 put_request_session(req
);
1892 mds
= __choose_mds(mdsc
, req
);
1894 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1895 dout("do_request no mds or not active, waiting for map\n");
1896 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1900 /* get, open session */
1901 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1903 session
= register_session(mdsc
, mds
);
1904 if (IS_ERR(session
)) {
1905 err
= PTR_ERR(session
);
1909 req
->r_session
= get_session(session
);
1911 dout("do_request mds%d session %p state %s\n", mds
, session
,
1912 session_state_name(session
->s_state
));
1913 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1914 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
1915 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
1916 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
1917 __open_session(mdsc
, session
);
1918 list_add(&req
->r_wait
, &session
->s_waiting
);
1923 req
->r_resend_mds
= -1; /* forget any previous mds hint */
1925 if (req
->r_request_started
== 0) /* note request start time */
1926 req
->r_request_started
= jiffies
;
1928 err
= __prepare_send_request(mdsc
, req
, mds
);
1930 ceph_msg_get(req
->r_request
);
1931 ceph_con_send(&session
->s_con
, req
->r_request
);
1935 ceph_put_mds_session(session
);
1941 complete_request(mdsc
, req
);
1946 * called under mdsc->mutex
1948 static void __wake_requests(struct ceph_mds_client
*mdsc
,
1949 struct list_head
*head
)
1951 struct ceph_mds_request
*req
;
1952 LIST_HEAD(tmp_list
);
1954 list_splice_init(head
, &tmp_list
);
1956 while (!list_empty(&tmp_list
)) {
1957 req
= list_entry(tmp_list
.next
,
1958 struct ceph_mds_request
, r_wait
);
1959 list_del_init(&req
->r_wait
);
1960 dout(" wake request %p tid %llu\n", req
, req
->r_tid
);
1961 __do_request(mdsc
, req
);
1966 * Wake up threads with requests pending for @mds, so that they can
1967 * resubmit their requests to a possibly different mds.
1969 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
1971 struct ceph_mds_request
*req
;
1974 dout("kick_requests mds%d\n", mds
);
1975 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
1976 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1977 if (req
->r_got_unsafe
)
1979 if (req
->r_session
&&
1980 req
->r_session
->s_mds
== mds
) {
1981 dout(" kicking tid %llu\n", req
->r_tid
);
1982 __do_request(mdsc
, req
);
1987 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
1988 struct ceph_mds_request
*req
)
1990 dout("submit_request on %p\n", req
);
1991 mutex_lock(&mdsc
->mutex
);
1992 __register_request(mdsc
, req
, NULL
);
1993 __do_request(mdsc
, req
);
1994 mutex_unlock(&mdsc
->mutex
);
1998 * Synchrously perform an mds request. Take care of all of the
1999 * session setup, forwarding, retry details.
2001 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
2003 struct ceph_mds_request
*req
)
2007 dout("do_request on %p\n", req
);
2009 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2011 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
2012 if (req
->r_locked_dir
)
2013 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
2014 if (req
->r_old_dentry
)
2015 ceph_get_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
2019 mutex_lock(&mdsc
->mutex
);
2020 __register_request(mdsc
, req
, dir
);
2021 __do_request(mdsc
, req
);
2025 __unregister_request(mdsc
, req
);
2026 dout("do_request early error %d\n", err
);
2031 mutex_unlock(&mdsc
->mutex
);
2032 dout("do_request waiting\n");
2033 if (req
->r_timeout
) {
2034 err
= (long)wait_for_completion_killable_timeout(
2035 &req
->r_completion
, req
->r_timeout
);
2039 err
= wait_for_completion_killable(&req
->r_completion
);
2041 dout("do_request waited, got %d\n", err
);
2042 mutex_lock(&mdsc
->mutex
);
2044 /* only abort if we didn't race with a real reply */
2045 if (req
->r_got_result
) {
2046 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
2047 } else if (err
< 0) {
2048 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
2051 * ensure we aren't running concurrently with
2052 * ceph_fill_trace or ceph_readdir_prepopulate, which
2053 * rely on locks (dir mutex) held by our caller.
2055 mutex_lock(&req
->r_fill_mutex
);
2057 req
->r_aborted
= true;
2058 mutex_unlock(&req
->r_fill_mutex
);
2060 if (req
->r_locked_dir
&&
2061 (req
->r_op
& CEPH_MDS_OP_WRITE
))
2062 ceph_invalidate_dir_request(req
);
2068 mutex_unlock(&mdsc
->mutex
);
2069 dout("do_request %p done, result %d\n", req
, err
);
2074 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2075 * namespace request.
2077 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
2079 struct inode
*inode
= req
->r_locked_dir
;
2081 dout("invalidate_dir_request %p (complete, lease(s))\n", inode
);
2083 ceph_dir_clear_complete(inode
);
2085 ceph_invalidate_dentry_lease(req
->r_dentry
);
2086 if (req
->r_old_dentry
)
2087 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
2093 * We take the session mutex and parse and process the reply immediately.
2094 * This preserves the logical ordering of replies, capabilities, etc., sent
2095 * by the MDS as they are applied to our local cache.
2097 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
2099 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2100 struct ceph_mds_request
*req
;
2101 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
2102 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
2105 int mds
= session
->s_mds
;
2107 if (msg
->front
.iov_len
< sizeof(*head
)) {
2108 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2113 /* get request, session */
2114 tid
= le64_to_cpu(msg
->hdr
.tid
);
2115 mutex_lock(&mdsc
->mutex
);
2116 req
= __lookup_request(mdsc
, tid
);
2118 dout("handle_reply on unknown tid %llu\n", tid
);
2119 mutex_unlock(&mdsc
->mutex
);
2122 dout("handle_reply %p\n", req
);
2124 /* correct session? */
2125 if (req
->r_session
!= session
) {
2126 pr_err("mdsc_handle_reply got %llu on session mds%d"
2127 " not mds%d\n", tid
, session
->s_mds
,
2128 req
->r_session
? req
->r_session
->s_mds
: -1);
2129 mutex_unlock(&mdsc
->mutex
);
2134 if ((req
->r_got_unsafe
&& !head
->safe
) ||
2135 (req
->r_got_safe
&& head
->safe
)) {
2136 pr_warning("got a dup %s reply on %llu from mds%d\n",
2137 head
->safe
? "safe" : "unsafe", tid
, mds
);
2138 mutex_unlock(&mdsc
->mutex
);
2141 if (req
->r_got_safe
&& !head
->safe
) {
2142 pr_warning("got unsafe after safe on %llu from mds%d\n",
2144 mutex_unlock(&mdsc
->mutex
);
2148 result
= le32_to_cpu(head
->result
);
2152 * if we're not talking to the authority, send to them
2153 * if the authority has changed while we weren't looking,
2154 * send to new authority
2155 * Otherwise we just have to return an ESTALE
2157 if (result
== -ESTALE
) {
2158 dout("got ESTALE on request %llu", req
->r_tid
);
2159 if (!req
->r_inode
) {
2160 /* do nothing; not an authority problem */
2161 } else if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2162 dout("not using auth, setting for that now");
2163 req
->r_direct_mode
= USE_AUTH_MDS
;
2164 __do_request(mdsc
, req
);
2165 mutex_unlock(&mdsc
->mutex
);
2168 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
2169 struct ceph_cap
*cap
= NULL
;
2172 cap
= ceph_get_cap_for_mds(ci
,
2173 req
->r_session
->s_mds
);
2175 dout("already using auth");
2176 if ((!cap
|| cap
!= ci
->i_auth_cap
) ||
2177 (cap
->mseq
!= req
->r_sent_on_mseq
)) {
2178 dout("but cap changed, so resending");
2179 __do_request(mdsc
, req
);
2180 mutex_unlock(&mdsc
->mutex
);
2184 dout("have to return ESTALE on request %llu", req
->r_tid
);
2189 req
->r_got_safe
= true;
2190 __unregister_request(mdsc
, req
);
2192 if (req
->r_got_unsafe
) {
2194 * We already handled the unsafe response, now do the
2195 * cleanup. No need to examine the response; the MDS
2196 * doesn't include any result info in the safe
2197 * response. And even if it did, there is nothing
2198 * useful we could do with a revised return value.
2200 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2201 list_del_init(&req
->r_unsafe_item
);
2203 /* last unsafe request during umount? */
2204 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2205 complete_all(&mdsc
->safe_umount_waiters
);
2206 mutex_unlock(&mdsc
->mutex
);
2210 req
->r_got_unsafe
= true;
2211 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2214 dout("handle_reply tid %lld result %d\n", tid
, result
);
2215 rinfo
= &req
->r_reply_info
;
2216 err
= parse_reply_info(msg
, rinfo
, session
->s_con
.peer_features
);
2217 mutex_unlock(&mdsc
->mutex
);
2219 mutex_lock(&session
->s_mutex
);
2221 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds
, tid
);
2227 if (rinfo
->snapblob_len
) {
2228 down_write(&mdsc
->snap_rwsem
);
2229 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2230 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2231 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
2232 downgrade_write(&mdsc
->snap_rwsem
);
2234 down_read(&mdsc
->snap_rwsem
);
2237 /* insert trace into our cache */
2238 mutex_lock(&req
->r_fill_mutex
);
2239 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2241 if (result
== 0 && (req
->r_op
== CEPH_MDS_OP_READDIR
||
2242 req
->r_op
== CEPH_MDS_OP_LSSNAP
))
2243 ceph_readdir_prepopulate(req
, req
->r_session
);
2244 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2246 mutex_unlock(&req
->r_fill_mutex
);
2248 up_read(&mdsc
->snap_rwsem
);
2250 mutex_lock(&mdsc
->mutex
);
2251 if (!req
->r_aborted
) {
2257 req
->r_got_result
= true;
2260 dout("reply arrived after request %lld was aborted\n", tid
);
2262 mutex_unlock(&mdsc
->mutex
);
2264 ceph_add_cap_releases(mdsc
, req
->r_session
);
2265 mutex_unlock(&session
->s_mutex
);
2267 /* kick calling process */
2268 complete_request(mdsc
, req
);
2270 ceph_mdsc_put_request(req
);
2277 * handle mds notification that our request has been forwarded.
2279 static void handle_forward(struct ceph_mds_client
*mdsc
,
2280 struct ceph_mds_session
*session
,
2281 struct ceph_msg
*msg
)
2283 struct ceph_mds_request
*req
;
2284 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2288 void *p
= msg
->front
.iov_base
;
2289 void *end
= p
+ msg
->front
.iov_len
;
2291 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2292 next_mds
= ceph_decode_32(&p
);
2293 fwd_seq
= ceph_decode_32(&p
);
2295 mutex_lock(&mdsc
->mutex
);
2296 req
= __lookup_request(mdsc
, tid
);
2298 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2299 goto out
; /* dup reply? */
2302 if (req
->r_aborted
) {
2303 dout("forward tid %llu aborted, unregistering\n", tid
);
2304 __unregister_request(mdsc
, req
);
2305 } else if (fwd_seq
<= req
->r_num_fwd
) {
2306 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2307 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2309 /* resend. forward race not possible; mds would drop */
2310 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2312 BUG_ON(req
->r_got_result
);
2313 req
->r_num_fwd
= fwd_seq
;
2314 req
->r_resend_mds
= next_mds
;
2315 put_request_session(req
);
2316 __do_request(mdsc
, req
);
2318 ceph_mdsc_put_request(req
);
2320 mutex_unlock(&mdsc
->mutex
);
2324 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2328 * handle a mds session control message
2330 static void handle_session(struct ceph_mds_session
*session
,
2331 struct ceph_msg
*msg
)
2333 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2336 int mds
= session
->s_mds
;
2337 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2341 if (msg
->front
.iov_len
!= sizeof(*h
))
2343 op
= le32_to_cpu(h
->op
);
2344 seq
= le64_to_cpu(h
->seq
);
2346 mutex_lock(&mdsc
->mutex
);
2347 if (op
== CEPH_SESSION_CLOSE
)
2348 __unregister_session(mdsc
, session
);
2349 /* FIXME: this ttl calculation is generous */
2350 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2351 mutex_unlock(&mdsc
->mutex
);
2353 mutex_lock(&session
->s_mutex
);
2355 dout("handle_session mds%d %s %p state %s seq %llu\n",
2356 mds
, ceph_session_op_name(op
), session
,
2357 session_state_name(session
->s_state
), seq
);
2359 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2360 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2361 pr_info("mds%d came back\n", session
->s_mds
);
2365 case CEPH_SESSION_OPEN
:
2366 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2367 pr_info("mds%d reconnect success\n", session
->s_mds
);
2368 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2369 renewed_caps(mdsc
, session
, 0);
2372 __close_session(mdsc
, session
);
2375 case CEPH_SESSION_RENEWCAPS
:
2376 if (session
->s_renew_seq
== seq
)
2377 renewed_caps(mdsc
, session
, 1);
2380 case CEPH_SESSION_CLOSE
:
2381 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2382 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2383 remove_session_caps(session
);
2384 wake
= 1; /* for good measure */
2385 wake_up_all(&mdsc
->session_close_wq
);
2386 kick_requests(mdsc
, mds
);
2389 case CEPH_SESSION_STALE
:
2390 pr_info("mds%d caps went stale, renewing\n",
2392 spin_lock(&session
->s_gen_ttl_lock
);
2393 session
->s_cap_gen
++;
2394 session
->s_cap_ttl
= jiffies
- 1;
2395 spin_unlock(&session
->s_gen_ttl_lock
);
2396 send_renew_caps(mdsc
, session
);
2399 case CEPH_SESSION_RECALL_STATE
:
2400 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2404 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2408 mutex_unlock(&session
->s_mutex
);
2410 mutex_lock(&mdsc
->mutex
);
2411 __wake_requests(mdsc
, &session
->s_waiting
);
2412 mutex_unlock(&mdsc
->mutex
);
2417 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2418 (int)msg
->front
.iov_len
);
2425 * called under session->mutex.
2427 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2428 struct ceph_mds_session
*session
)
2430 struct ceph_mds_request
*req
, *nreq
;
2433 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2435 mutex_lock(&mdsc
->mutex
);
2436 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2437 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2439 ceph_msg_get(req
->r_request
);
2440 ceph_con_send(&session
->s_con
, req
->r_request
);
2443 mutex_unlock(&mdsc
->mutex
);
2447 * Encode information about a cap for a reconnect with the MDS.
2449 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2453 struct ceph_mds_cap_reconnect v2
;
2454 struct ceph_mds_cap_reconnect_v1 v1
;
2457 struct ceph_inode_info
*ci
;
2458 struct ceph_reconnect_state
*recon_state
= arg
;
2459 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2463 struct dentry
*dentry
;
2467 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2468 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2469 ceph_cap_string(cap
->issued
));
2470 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2474 dentry
= d_find_alias(inode
);
2476 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2478 err
= PTR_ERR(path
);
2485 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2489 spin_lock(&ci
->i_ceph_lock
);
2490 cap
->seq
= 0; /* reset cap seq */
2491 cap
->issue_seq
= 0; /* and issue_seq */
2492 cap
->mseq
= 0; /* and migrate_seq */
2493 cap
->cap_gen
= cap
->session
->s_cap_gen
;
2495 if (recon_state
->flock
) {
2496 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2497 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2498 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2499 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2500 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2501 rec
.v2
.flock_len
= 0;
2502 reclen
= sizeof(rec
.v2
);
2504 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2505 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2506 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2507 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2508 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2509 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2510 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2511 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2512 reclen
= sizeof(rec
.v1
);
2514 spin_unlock(&ci
->i_ceph_lock
);
2516 if (recon_state
->flock
) {
2517 int num_fcntl_locks
, num_flock_locks
;
2518 struct ceph_filelock
*flocks
;
2521 spin_lock(&inode
->i_lock
);
2522 ceph_count_locks(inode
, &num_fcntl_locks
, &num_flock_locks
);
2523 spin_unlock(&inode
->i_lock
);
2524 flocks
= kmalloc((num_fcntl_locks
+num_flock_locks
) *
2525 sizeof(struct ceph_filelock
), GFP_NOFS
);
2530 spin_lock(&inode
->i_lock
);
2531 err
= ceph_encode_locks_to_buffer(inode
, flocks
,
2534 spin_unlock(&inode
->i_lock
);
2542 * number of encoded locks is stable, so copy to pagelist
2544 rec
.v2
.flock_len
= cpu_to_le32(2*sizeof(u32
) +
2545 (num_fcntl_locks
+num_flock_locks
) *
2546 sizeof(struct ceph_filelock
));
2547 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2549 err
= ceph_locks_to_pagelist(flocks
, pagelist
,
2554 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2557 recon_state
->nr_caps
++;
2567 * If an MDS fails and recovers, clients need to reconnect in order to
2568 * reestablish shared state. This includes all caps issued through
2569 * this session _and_ the snap_realm hierarchy. Because it's not
2570 * clear which snap realms the mds cares about, we send everything we
2571 * know about.. that ensures we'll then get any new info the
2572 * recovering MDS might have.
2574 * This is a relatively heavyweight operation, but it's rare.
2576 * called with mdsc->mutex held.
2578 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2579 struct ceph_mds_session
*session
)
2581 struct ceph_msg
*reply
;
2583 int mds
= session
->s_mds
;
2586 struct ceph_pagelist
*pagelist
;
2587 struct ceph_reconnect_state recon_state
;
2589 pr_info("mds%d reconnect start\n", mds
);
2591 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2593 goto fail_nopagelist
;
2594 ceph_pagelist_init(pagelist
);
2596 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
, false);
2600 mutex_lock(&session
->s_mutex
);
2601 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2604 ceph_con_close(&session
->s_con
);
2605 ceph_con_open(&session
->s_con
,
2606 CEPH_ENTITY_TYPE_MDS
, mds
,
2607 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2609 /* replay unsafe requests */
2610 replay_unsafe_requests(mdsc
, session
);
2612 down_read(&mdsc
->snap_rwsem
);
2614 dout("session %p state %s\n", session
,
2615 session_state_name(session
->s_state
));
2617 spin_lock(&session
->s_gen_ttl_lock
);
2618 session
->s_cap_gen
++;
2619 spin_unlock(&session
->s_gen_ttl_lock
);
2621 spin_lock(&session
->s_cap_lock
);
2623 * notify __ceph_remove_cap() that we are composing cap reconnect.
2624 * If a cap get released before being added to the cap reconnect,
2625 * __ceph_remove_cap() should skip queuing cap release.
2627 session
->s_cap_reconnect
= 1;
2628 /* drop old cap expires; we're about to reestablish that state */
2629 discard_cap_releases(mdsc
, session
);
2630 spin_unlock(&session
->s_cap_lock
);
2632 /* traverse this session's caps */
2633 s_nr_caps
= session
->s_nr_caps
;
2634 err
= ceph_pagelist_encode_32(pagelist
, s_nr_caps
);
2638 recon_state
.nr_caps
= 0;
2639 recon_state
.pagelist
= pagelist
;
2640 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2641 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2645 spin_lock(&session
->s_cap_lock
);
2646 session
->s_cap_reconnect
= 0;
2647 spin_unlock(&session
->s_cap_lock
);
2650 * snaprealms. we provide mds with the ino, seq (version), and
2651 * parent for all of our realms. If the mds has any newer info,
2654 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2655 struct ceph_snap_realm
*realm
=
2656 rb_entry(p
, struct ceph_snap_realm
, node
);
2657 struct ceph_mds_snaprealm_reconnect sr_rec
;
2659 dout(" adding snap realm %llx seq %lld parent %llx\n",
2660 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2661 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2662 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2663 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2664 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2669 if (recon_state
.flock
)
2670 reply
->hdr
.version
= cpu_to_le16(2);
2672 /* raced with cap release? */
2673 if (s_nr_caps
!= recon_state
.nr_caps
) {
2674 struct page
*page
= list_first_entry(&pagelist
->head
,
2676 __le32
*addr
= kmap_atomic(page
);
2677 *addr
= cpu_to_le32(recon_state
.nr_caps
);
2678 kunmap_atomic(addr
);
2681 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2682 ceph_msg_data_add_pagelist(reply
, pagelist
);
2683 ceph_con_send(&session
->s_con
, reply
);
2685 mutex_unlock(&session
->s_mutex
);
2687 mutex_lock(&mdsc
->mutex
);
2688 __wake_requests(mdsc
, &session
->s_waiting
);
2689 mutex_unlock(&mdsc
->mutex
);
2691 up_read(&mdsc
->snap_rwsem
);
2695 ceph_msg_put(reply
);
2696 up_read(&mdsc
->snap_rwsem
);
2697 mutex_unlock(&session
->s_mutex
);
2699 ceph_pagelist_release(pagelist
);
2702 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2708 * compare old and new mdsmaps, kicking requests
2709 * and closing out old connections as necessary
2711 * called under mdsc->mutex.
2713 static void check_new_map(struct ceph_mds_client
*mdsc
,
2714 struct ceph_mdsmap
*newmap
,
2715 struct ceph_mdsmap
*oldmap
)
2718 int oldstate
, newstate
;
2719 struct ceph_mds_session
*s
;
2721 dout("check_new_map new %u old %u\n",
2722 newmap
->m_epoch
, oldmap
->m_epoch
);
2724 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2725 if (mdsc
->sessions
[i
] == NULL
)
2727 s
= mdsc
->sessions
[i
];
2728 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2729 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2731 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2732 i
, ceph_mds_state_name(oldstate
),
2733 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
2734 ceph_mds_state_name(newstate
),
2735 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
2736 session_state_name(s
->s_state
));
2738 if (i
>= newmap
->m_max_mds
||
2739 memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2740 ceph_mdsmap_get_addr(newmap
, i
),
2741 sizeof(struct ceph_entity_addr
))) {
2742 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2743 /* the session never opened, just close it
2745 __wake_requests(mdsc
, &s
->s_waiting
);
2746 __unregister_session(mdsc
, s
);
2749 mutex_unlock(&mdsc
->mutex
);
2750 mutex_lock(&s
->s_mutex
);
2751 mutex_lock(&mdsc
->mutex
);
2752 ceph_con_close(&s
->s_con
);
2753 mutex_unlock(&s
->s_mutex
);
2754 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2757 /* kick any requests waiting on the recovering mds */
2758 kick_requests(mdsc
, i
);
2759 } else if (oldstate
== newstate
) {
2760 continue; /* nothing new with this mds */
2766 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2767 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
2768 mutex_unlock(&mdsc
->mutex
);
2769 send_mds_reconnect(mdsc
, s
);
2770 mutex_lock(&mdsc
->mutex
);
2774 * kick request on any mds that has gone active.
2776 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2777 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2778 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
2779 oldstate
!= CEPH_MDS_STATE_STARTING
)
2780 pr_info("mds%d recovery completed\n", s
->s_mds
);
2781 kick_requests(mdsc
, i
);
2782 ceph_kick_flushing_caps(mdsc
, s
);
2783 wake_up_session_caps(s
, 1);
2787 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2788 s
= mdsc
->sessions
[i
];
2791 if (!ceph_mdsmap_is_laggy(newmap
, i
))
2793 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2794 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
2795 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2796 dout(" connecting to export targets of laggy mds%d\n",
2798 __open_export_target_sessions(mdsc
, s
);
2810 * caller must hold session s_mutex, dentry->d_lock
2812 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2814 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2816 ceph_put_mds_session(di
->lease_session
);
2817 di
->lease_session
= NULL
;
2820 static void handle_lease(struct ceph_mds_client
*mdsc
,
2821 struct ceph_mds_session
*session
,
2822 struct ceph_msg
*msg
)
2824 struct super_block
*sb
= mdsc
->fsc
->sb
;
2825 struct inode
*inode
;
2826 struct dentry
*parent
, *dentry
;
2827 struct ceph_dentry_info
*di
;
2828 int mds
= session
->s_mds
;
2829 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2831 struct ceph_vino vino
;
2835 dout("handle_lease from mds%d\n", mds
);
2838 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2840 vino
.ino
= le64_to_cpu(h
->ino
);
2841 vino
.snap
= CEPH_NOSNAP
;
2842 seq
= le32_to_cpu(h
->seq
);
2843 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2844 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2845 if (dname
.len
!= get_unaligned_le32(h
+1))
2848 mutex_lock(&session
->s_mutex
);
2852 inode
= ceph_find_inode(sb
, vino
);
2853 dout("handle_lease %s, ino %llx %p %.*s\n",
2854 ceph_lease_op_name(h
->action
), vino
.ino
, inode
,
2855 dname
.len
, dname
.name
);
2856 if (inode
== NULL
) {
2857 dout("handle_lease no inode %llx\n", vino
.ino
);
2862 parent
= d_find_alias(inode
);
2864 dout("no parent dentry on inode %p\n", inode
);
2866 goto release
; /* hrm... */
2868 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2869 dentry
= d_lookup(parent
, &dname
);
2874 spin_lock(&dentry
->d_lock
);
2875 di
= ceph_dentry(dentry
);
2876 switch (h
->action
) {
2877 case CEPH_MDS_LEASE_REVOKE
:
2878 if (di
->lease_session
== session
) {
2879 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
2880 h
->seq
= cpu_to_le32(di
->lease_seq
);
2881 __ceph_mdsc_drop_dentry_lease(dentry
);
2886 case CEPH_MDS_LEASE_RENEW
:
2887 if (di
->lease_session
== session
&&
2888 di
->lease_gen
== session
->s_cap_gen
&&
2889 di
->lease_renew_from
&&
2890 di
->lease_renew_after
== 0) {
2891 unsigned long duration
=
2892 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2894 di
->lease_seq
= seq
;
2895 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2896 di
->lease_renew_after
= di
->lease_renew_from
+
2898 di
->lease_renew_from
= 0;
2902 spin_unlock(&dentry
->d_lock
);
2909 /* let's just reuse the same message */
2910 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2912 ceph_con_send(&session
->s_con
, msg
);
2916 mutex_unlock(&session
->s_mutex
);
2920 pr_err("corrupt lease message\n");
2924 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
2925 struct inode
*inode
,
2926 struct dentry
*dentry
, char action
,
2929 struct ceph_msg
*msg
;
2930 struct ceph_mds_lease
*lease
;
2931 int len
= sizeof(*lease
) + sizeof(u32
);
2934 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2935 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
2936 dnamelen
= dentry
->d_name
.len
;
2939 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
, false);
2942 lease
= msg
->front
.iov_base
;
2943 lease
->action
= action
;
2944 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
2945 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
2946 lease
->seq
= cpu_to_le32(seq
);
2947 put_unaligned_le32(dnamelen
, lease
+ 1);
2948 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
2951 * if this is a preemptive lease RELEASE, no need to
2952 * flush request stream, since the actual request will
2955 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
2957 ceph_con_send(&session
->s_con
, msg
);
2961 * Preemptively release a lease we expect to invalidate anyway.
2962 * Pass @inode always, @dentry is optional.
2964 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
2965 struct dentry
*dentry
)
2967 struct ceph_dentry_info
*di
;
2968 struct ceph_mds_session
*session
;
2971 BUG_ON(inode
== NULL
);
2972 BUG_ON(dentry
== NULL
);
2974 /* is dentry lease valid? */
2975 spin_lock(&dentry
->d_lock
);
2976 di
= ceph_dentry(dentry
);
2977 if (!di
|| !di
->lease_session
||
2978 di
->lease_session
->s_mds
< 0 ||
2979 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
2980 !time_before(jiffies
, dentry
->d_time
)) {
2981 dout("lease_release inode %p dentry %p -- "
2984 spin_unlock(&dentry
->d_lock
);
2988 /* we do have a lease on this dentry; note mds and seq */
2989 session
= ceph_get_mds_session(di
->lease_session
);
2990 seq
= di
->lease_seq
;
2991 __ceph_mdsc_drop_dentry_lease(dentry
);
2992 spin_unlock(&dentry
->d_lock
);
2994 dout("lease_release inode %p dentry %p to mds%d\n",
2995 inode
, dentry
, session
->s_mds
);
2996 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
2997 CEPH_MDS_LEASE_RELEASE
, seq
);
2998 ceph_put_mds_session(session
);
3002 * drop all leases (and dentry refs) in preparation for umount
3004 static void drop_leases(struct ceph_mds_client
*mdsc
)
3008 dout("drop_leases\n");
3009 mutex_lock(&mdsc
->mutex
);
3010 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3011 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3014 mutex_unlock(&mdsc
->mutex
);
3015 mutex_lock(&s
->s_mutex
);
3016 mutex_unlock(&s
->s_mutex
);
3017 ceph_put_mds_session(s
);
3018 mutex_lock(&mdsc
->mutex
);
3020 mutex_unlock(&mdsc
->mutex
);
3026 * delayed work -- periodically trim expired leases, renew caps with mds
3028 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
3031 unsigned hz
= round_jiffies_relative(HZ
* delay
);
3032 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
3035 static void delayed_work(struct work_struct
*work
)
3038 struct ceph_mds_client
*mdsc
=
3039 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
3043 dout("mdsc delayed_work\n");
3044 ceph_check_delayed_caps(mdsc
);
3046 mutex_lock(&mdsc
->mutex
);
3047 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
3048 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
3049 mdsc
->last_renew_caps
);
3051 mdsc
->last_renew_caps
= jiffies
;
3053 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3054 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3057 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3058 dout("resending session close request for mds%d\n",
3060 request_close_session(mdsc
, s
);
3061 ceph_put_mds_session(s
);
3064 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
3065 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
3066 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
3067 pr_info("mds%d hung\n", s
->s_mds
);
3070 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
3071 /* this mds is failed or recovering, just wait */
3072 ceph_put_mds_session(s
);
3075 mutex_unlock(&mdsc
->mutex
);
3077 mutex_lock(&s
->s_mutex
);
3079 send_renew_caps(mdsc
, s
);
3081 ceph_con_keepalive(&s
->s_con
);
3082 ceph_add_cap_releases(mdsc
, s
);
3083 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3084 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
3085 ceph_send_cap_releases(mdsc
, s
);
3086 mutex_unlock(&s
->s_mutex
);
3087 ceph_put_mds_session(s
);
3089 mutex_lock(&mdsc
->mutex
);
3091 mutex_unlock(&mdsc
->mutex
);
3093 schedule_delayed(mdsc
);
3096 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
3099 struct ceph_mds_client
*mdsc
;
3101 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
3106 mutex_init(&mdsc
->mutex
);
3107 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
3108 if (mdsc
->mdsmap
== NULL
) {
3113 init_completion(&mdsc
->safe_umount_waiters
);
3114 init_waitqueue_head(&mdsc
->session_close_wq
);
3115 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
3116 mdsc
->sessions
= NULL
;
3117 mdsc
->max_sessions
= 0;
3119 init_rwsem(&mdsc
->snap_rwsem
);
3120 mdsc
->snap_realms
= RB_ROOT
;
3121 INIT_LIST_HEAD(&mdsc
->snap_empty
);
3122 spin_lock_init(&mdsc
->snap_empty_lock
);
3124 mdsc
->request_tree
= RB_ROOT
;
3125 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
3126 mdsc
->last_renew_caps
= jiffies
;
3127 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
3128 spin_lock_init(&mdsc
->cap_delay_lock
);
3129 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
3130 spin_lock_init(&mdsc
->snap_flush_lock
);
3131 mdsc
->cap_flush_seq
= 0;
3132 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
3133 INIT_LIST_HEAD(&mdsc
->cap_dirty_migrating
);
3134 mdsc
->num_cap_flushing
= 0;
3135 spin_lock_init(&mdsc
->cap_dirty_lock
);
3136 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
3137 spin_lock_init(&mdsc
->dentry_lru_lock
);
3138 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
3140 ceph_caps_init(mdsc
);
3141 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
3147 * Wait for safe replies on open mds requests. If we time out, drop
3148 * all requests from the tree to avoid dangling dentry refs.
3150 static void wait_requests(struct ceph_mds_client
*mdsc
)
3152 struct ceph_mds_request
*req
;
3153 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3155 mutex_lock(&mdsc
->mutex
);
3156 if (__get_oldest_req(mdsc
)) {
3157 mutex_unlock(&mdsc
->mutex
);
3159 dout("wait_requests waiting for requests\n");
3160 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
3161 fsc
->client
->options
->mount_timeout
* HZ
);
3163 /* tear down remaining requests */
3164 mutex_lock(&mdsc
->mutex
);
3165 while ((req
= __get_oldest_req(mdsc
))) {
3166 dout("wait_requests timed out on tid %llu\n",
3168 __unregister_request(mdsc
, req
);
3171 mutex_unlock(&mdsc
->mutex
);
3172 dout("wait_requests done\n");
3176 * called before mount is ro, and before dentries are torn down.
3177 * (hmm, does this still race with new lookups?)
3179 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
3181 dout("pre_umount\n");
3185 ceph_flush_dirty_caps(mdsc
);
3186 wait_requests(mdsc
);
3189 * wait for reply handlers to drop their request refs and
3190 * their inode/dcache refs
3196 * wait for all write mds requests to flush.
3198 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3200 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3203 mutex_lock(&mdsc
->mutex
);
3204 dout("wait_unsafe_requests want %lld\n", want_tid
);
3206 req
= __get_oldest_req(mdsc
);
3207 while (req
&& req
->r_tid
<= want_tid
) {
3208 /* find next request */
3209 n
= rb_next(&req
->r_node
);
3211 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3214 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3216 ceph_mdsc_get_request(req
);
3218 ceph_mdsc_get_request(nextreq
);
3219 mutex_unlock(&mdsc
->mutex
);
3220 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3221 req
->r_tid
, want_tid
);
3222 wait_for_completion(&req
->r_safe_completion
);
3223 mutex_lock(&mdsc
->mutex
);
3224 ceph_mdsc_put_request(req
);
3226 break; /* next dne before, so we're done! */
3227 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3228 /* next request was removed from tree */
3229 ceph_mdsc_put_request(nextreq
);
3232 ceph_mdsc_put_request(nextreq
); /* won't go away */
3236 mutex_unlock(&mdsc
->mutex
);
3237 dout("wait_unsafe_requests done\n");
3240 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3242 u64 want_tid
, want_flush
;
3244 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3248 mutex_lock(&mdsc
->mutex
);
3249 want_tid
= mdsc
->last_tid
;
3250 want_flush
= mdsc
->cap_flush_seq
;
3251 mutex_unlock(&mdsc
->mutex
);
3252 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3254 ceph_flush_dirty_caps(mdsc
);
3256 wait_unsafe_requests(mdsc
, want_tid
);
3257 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
3261 * true if all sessions are closed, or we force unmount
3263 static bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3267 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3270 mutex_lock(&mdsc
->mutex
);
3271 for (i
= 0; i
< mdsc
->max_sessions
; i
++)
3272 if (mdsc
->sessions
[i
])
3274 mutex_unlock(&mdsc
->mutex
);
3279 * called after sb is ro.
3281 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3283 struct ceph_mds_session
*session
;
3285 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3286 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3288 dout("close_sessions\n");
3290 /* close sessions */
3291 mutex_lock(&mdsc
->mutex
);
3292 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3293 session
= __ceph_lookup_mds_session(mdsc
, i
);
3296 mutex_unlock(&mdsc
->mutex
);
3297 mutex_lock(&session
->s_mutex
);
3298 __close_session(mdsc
, session
);
3299 mutex_unlock(&session
->s_mutex
);
3300 ceph_put_mds_session(session
);
3301 mutex_lock(&mdsc
->mutex
);
3303 mutex_unlock(&mdsc
->mutex
);
3305 dout("waiting for sessions to close\n");
3306 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3309 /* tear down remaining sessions */
3310 mutex_lock(&mdsc
->mutex
);
3311 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3312 if (mdsc
->sessions
[i
]) {
3313 session
= get_session(mdsc
->sessions
[i
]);
3314 __unregister_session(mdsc
, session
);
3315 mutex_unlock(&mdsc
->mutex
);
3316 mutex_lock(&session
->s_mutex
);
3317 remove_session_caps(session
);
3318 mutex_unlock(&session
->s_mutex
);
3319 ceph_put_mds_session(session
);
3320 mutex_lock(&mdsc
->mutex
);
3323 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3324 mutex_unlock(&mdsc
->mutex
);
3326 ceph_cleanup_empty_realms(mdsc
);
3328 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3333 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3336 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3338 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3339 kfree(mdsc
->sessions
);
3340 ceph_caps_finalize(mdsc
);
3343 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3345 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3347 dout("mdsc_destroy %p\n", mdsc
);
3348 ceph_mdsc_stop(mdsc
);
3350 /* flush out any connection work with references to us */
3355 dout("mdsc_destroy %p done\n", mdsc
);
3360 * handle mds map update.
3362 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3366 void *p
= msg
->front
.iov_base
;
3367 void *end
= p
+ msg
->front
.iov_len
;
3368 struct ceph_mdsmap
*newmap
, *oldmap
;
3369 struct ceph_fsid fsid
;
3372 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3373 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3374 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3376 epoch
= ceph_decode_32(&p
);
3377 maplen
= ceph_decode_32(&p
);
3378 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3380 /* do we need it? */
3381 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3382 mutex_lock(&mdsc
->mutex
);
3383 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3384 dout("handle_map epoch %u <= our %u\n",
3385 epoch
, mdsc
->mdsmap
->m_epoch
);
3386 mutex_unlock(&mdsc
->mutex
);
3390 newmap
= ceph_mdsmap_decode(&p
, end
);
3391 if (IS_ERR(newmap
)) {
3392 err
= PTR_ERR(newmap
);
3396 /* swap into place */
3398 oldmap
= mdsc
->mdsmap
;
3399 mdsc
->mdsmap
= newmap
;
3400 check_new_map(mdsc
, newmap
, oldmap
);
3401 ceph_mdsmap_destroy(oldmap
);
3403 mdsc
->mdsmap
= newmap
; /* first mds map */
3405 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3407 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3409 mutex_unlock(&mdsc
->mutex
);
3410 schedule_delayed(mdsc
);
3414 mutex_unlock(&mdsc
->mutex
);
3416 pr_err("error decoding mdsmap %d\n", err
);
3420 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3422 struct ceph_mds_session
*s
= con
->private;
3424 if (get_session(s
)) {
3425 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3428 dout("mdsc con_get %p FAIL\n", s
);
3432 static void con_put(struct ceph_connection
*con
)
3434 struct ceph_mds_session
*s
= con
->private;
3436 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
) - 1);
3437 ceph_put_mds_session(s
);
3441 * if the client is unresponsive for long enough, the mds will kill
3442 * the session entirely.
3444 static void peer_reset(struct ceph_connection
*con
)
3446 struct ceph_mds_session
*s
= con
->private;
3447 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3449 pr_warning("mds%d closed our session\n", s
->s_mds
);
3450 send_mds_reconnect(mdsc
, s
);
3453 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3455 struct ceph_mds_session
*s
= con
->private;
3456 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3457 int type
= le16_to_cpu(msg
->hdr
.type
);
3459 mutex_lock(&mdsc
->mutex
);
3460 if (__verify_registered_session(mdsc
, s
) < 0) {
3461 mutex_unlock(&mdsc
->mutex
);
3464 mutex_unlock(&mdsc
->mutex
);
3467 case CEPH_MSG_MDS_MAP
:
3468 ceph_mdsc_handle_map(mdsc
, msg
);
3470 case CEPH_MSG_CLIENT_SESSION
:
3471 handle_session(s
, msg
);
3473 case CEPH_MSG_CLIENT_REPLY
:
3474 handle_reply(s
, msg
);
3476 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3477 handle_forward(mdsc
, s
, msg
);
3479 case CEPH_MSG_CLIENT_CAPS
:
3480 ceph_handle_caps(s
, msg
);
3482 case CEPH_MSG_CLIENT_SNAP
:
3483 ceph_handle_snap(mdsc
, s
, msg
);
3485 case CEPH_MSG_CLIENT_LEASE
:
3486 handle_lease(mdsc
, s
, msg
);
3490 pr_err("received unknown message type %d %s\n", type
,
3491 ceph_msg_type_name(type
));
3502 * Note: returned pointer is the address of a structure that's
3503 * managed separately. Caller must *not* attempt to free it.
3505 static struct ceph_auth_handshake
*get_authorizer(struct ceph_connection
*con
,
3506 int *proto
, int force_new
)
3508 struct ceph_mds_session
*s
= con
->private;
3509 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3510 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3511 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
3513 if (force_new
&& auth
->authorizer
) {
3514 ceph_auth_destroy_authorizer(ac
, auth
->authorizer
);
3515 auth
->authorizer
= NULL
;
3517 if (!auth
->authorizer
) {
3518 int ret
= ceph_auth_create_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3521 return ERR_PTR(ret
);
3523 int ret
= ceph_auth_update_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3526 return ERR_PTR(ret
);
3528 *proto
= ac
->protocol
;
3534 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3536 struct ceph_mds_session
*s
= con
->private;
3537 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3538 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3540 return ceph_auth_verify_authorizer_reply(ac
, s
->s_auth
.authorizer
, len
);
3543 static int invalidate_authorizer(struct ceph_connection
*con
)
3545 struct ceph_mds_session
*s
= con
->private;
3546 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3547 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3549 ceph_auth_invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3551 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3554 static struct ceph_msg
*mds_alloc_msg(struct ceph_connection
*con
,
3555 struct ceph_msg_header
*hdr
, int *skip
)
3557 struct ceph_msg
*msg
;
3558 int type
= (int) le16_to_cpu(hdr
->type
);
3559 int front_len
= (int) le32_to_cpu(hdr
->front_len
);
3565 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
3567 pr_err("unable to allocate msg type %d len %d\n",
3575 static const struct ceph_connection_operations mds_con_ops
= {
3578 .dispatch
= dispatch
,
3579 .get_authorizer
= get_authorizer
,
3580 .verify_authorizer_reply
= verify_authorizer_reply
,
3581 .invalidate_authorizer
= invalidate_authorizer
,
3582 .peer_reset
= peer_reset
,
3583 .alloc_msg
= mds_alloc_msg
,