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41 * are no longer valid.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
,
69 *p
+= sizeof(struct ceph_mds_reply_inode
) +
70 sizeof(*info
->in
->fragtree
.splits
) *
71 le32_to_cpu(info
->in
->fragtree
.nsplits
);
73 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
74 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
76 *p
+= info
->symlink_len
;
78 if (features
& CEPH_FEATURE_DIRLAYOUTHASH
)
79 ceph_decode_copy_safe(p
, end
, &info
->dir_layout
,
80 sizeof(info
->dir_layout
), bad
);
82 memset(&info
->dir_layout
, 0, sizeof(info
->dir_layout
));
84 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
85 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
86 info
->xattr_data
= *p
;
87 *p
+= info
->xattr_len
;
94 * parse a normal reply, which may contain a (dir+)dentry and/or a
97 static int parse_reply_info_trace(void **p
, void *end
,
98 struct ceph_mds_reply_info_parsed
*info
,
103 if (info
->head
->is_dentry
) {
104 err
= parse_reply_info_in(p
, end
, &info
->diri
, features
);
108 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
111 *p
+= sizeof(*info
->dirfrag
) +
112 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
113 if (unlikely(*p
> end
))
116 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
117 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
119 *p
+= info
->dname_len
;
121 *p
+= sizeof(*info
->dlease
);
124 if (info
->head
->is_target
) {
125 err
= parse_reply_info_in(p
, end
, &info
->targeti
, features
);
130 if (unlikely(*p
!= end
))
137 pr_err("problem parsing mds trace %d\n", err
);
142 * parse readdir results
144 static int parse_reply_info_dir(void **p
, void *end
,
145 struct ceph_mds_reply_info_parsed
*info
,
152 if (*p
+ sizeof(*info
->dir_dir
) > end
)
154 *p
+= sizeof(*info
->dir_dir
) +
155 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
159 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
160 num
= ceph_decode_32(p
);
161 info
->dir_end
= ceph_decode_8(p
);
162 info
->dir_complete
= ceph_decode_8(p
);
166 /* alloc large array */
168 info
->dir_in
= kcalloc(num
, sizeof(*info
->dir_in
) +
169 sizeof(*info
->dir_dname
) +
170 sizeof(*info
->dir_dname_len
) +
171 sizeof(*info
->dir_dlease
),
173 if (info
->dir_in
== NULL
) {
177 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
178 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
179 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
183 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
184 info
->dir_dname_len
[i
] = ceph_decode_32(p
);
185 ceph_decode_need(p
, end
, info
->dir_dname_len
[i
], bad
);
186 info
->dir_dname
[i
] = *p
;
187 *p
+= info
->dir_dname_len
[i
];
188 dout("parsed dir dname '%.*s'\n", info
->dir_dname_len
[i
],
190 info
->dir_dlease
[i
] = *p
;
191 *p
+= sizeof(struct ceph_mds_reply_lease
);
194 err
= parse_reply_info_in(p
, end
, &info
->dir_in
[i
], features
);
209 pr_err("problem parsing dir contents %d\n", err
);
214 * parse fcntl F_GETLK results
216 static int parse_reply_info_filelock(void **p
, void *end
,
217 struct ceph_mds_reply_info_parsed
*info
,
220 if (*p
+ sizeof(*info
->filelock_reply
) > end
)
223 info
->filelock_reply
= *p
;
224 *p
+= sizeof(*info
->filelock_reply
);
226 if (unlikely(*p
!= end
))
235 * parse extra results
237 static int parse_reply_info_extra(void **p
, void *end
,
238 struct ceph_mds_reply_info_parsed
*info
,
241 if (info
->head
->op
== CEPH_MDS_OP_GETFILELOCK
)
242 return parse_reply_info_filelock(p
, end
, info
, features
);
244 return parse_reply_info_dir(p
, end
, info
, features
);
248 * parse entire mds reply
250 static int parse_reply_info(struct ceph_msg
*msg
,
251 struct ceph_mds_reply_info_parsed
*info
,
258 info
->head
= msg
->front
.iov_base
;
259 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
260 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
263 ceph_decode_32_safe(&p
, end
, len
, bad
);
265 err
= parse_reply_info_trace(&p
, p
+len
, info
, features
);
271 ceph_decode_32_safe(&p
, end
, len
, bad
);
273 err
= parse_reply_info_extra(&p
, p
+len
, info
, features
);
279 ceph_decode_32_safe(&p
, end
, len
, bad
);
280 info
->snapblob_len
= len
;
291 pr_err("mds parse_reply err %d\n", err
);
295 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
304 static const char *session_state_name(int s
)
307 case CEPH_MDS_SESSION_NEW
: return "new";
308 case CEPH_MDS_SESSION_OPENING
: return "opening";
309 case CEPH_MDS_SESSION_OPEN
: return "open";
310 case CEPH_MDS_SESSION_HUNG
: return "hung";
311 case CEPH_MDS_SESSION_CLOSING
: return "closing";
312 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
313 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
314 default: return "???";
318 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
320 if (atomic_inc_not_zero(&s
->s_ref
)) {
321 dout("mdsc get_session %p %d -> %d\n", s
,
322 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
325 dout("mdsc get_session %p 0 -- FAIL", s
);
330 void ceph_put_mds_session(struct ceph_mds_session
*s
)
332 dout("mdsc put_session %p %d -> %d\n", s
,
333 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
334 if (atomic_dec_and_test(&s
->s_ref
)) {
336 s
->s_mdsc
->fsc
->client
->monc
.auth
->ops
->destroy_authorizer(
337 s
->s_mdsc
->fsc
->client
->monc
.auth
,
344 * called under mdsc->mutex
346 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
349 struct ceph_mds_session
*session
;
351 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
353 session
= mdsc
->sessions
[mds
];
354 dout("lookup_mds_session %p %d\n", session
,
355 atomic_read(&session
->s_ref
));
356 get_session(session
);
360 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
362 if (mds
>= mdsc
->max_sessions
)
364 return mdsc
->sessions
[mds
];
367 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
368 struct ceph_mds_session
*s
)
370 if (s
->s_mds
>= mdsc
->max_sessions
||
371 mdsc
->sessions
[s
->s_mds
] != s
)
377 * create+register a new session for given mds.
378 * called under mdsc->mutex.
380 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
383 struct ceph_mds_session
*s
;
385 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
387 return ERR_PTR(-ENOMEM
);
390 s
->s_state
= CEPH_MDS_SESSION_NEW
;
393 mutex_init(&s
->s_mutex
);
395 ceph_con_init(mdsc
->fsc
->client
->msgr
, &s
->s_con
);
396 s
->s_con
.private = s
;
397 s
->s_con
.ops
= &mds_con_ops
;
398 s
->s_con
.peer_name
.type
= CEPH_ENTITY_TYPE_MDS
;
399 s
->s_con
.peer_name
.num
= cpu_to_le64(mds
);
401 spin_lock_init(&s
->s_cap_lock
);
404 s
->s_renew_requested
= 0;
406 INIT_LIST_HEAD(&s
->s_caps
);
409 atomic_set(&s
->s_ref
, 1);
410 INIT_LIST_HEAD(&s
->s_waiting
);
411 INIT_LIST_HEAD(&s
->s_unsafe
);
412 s
->s_num_cap_releases
= 0;
413 s
->s_cap_iterator
= NULL
;
414 INIT_LIST_HEAD(&s
->s_cap_releases
);
415 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
416 INIT_LIST_HEAD(&s
->s_cap_flushing
);
417 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
419 dout("register_session mds%d\n", mds
);
420 if (mds
>= mdsc
->max_sessions
) {
421 int newmax
= 1 << get_count_order(mds
+1);
422 struct ceph_mds_session
**sa
;
424 dout("register_session realloc to %d\n", newmax
);
425 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
428 if (mdsc
->sessions
) {
429 memcpy(sa
, mdsc
->sessions
,
430 mdsc
->max_sessions
* sizeof(void *));
431 kfree(mdsc
->sessions
);
434 mdsc
->max_sessions
= newmax
;
436 mdsc
->sessions
[mds
] = s
;
437 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
439 ceph_con_open(&s
->s_con
, ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
445 return ERR_PTR(-ENOMEM
);
449 * called under mdsc->mutex
451 static void __unregister_session(struct ceph_mds_client
*mdsc
,
452 struct ceph_mds_session
*s
)
454 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
455 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
456 mdsc
->sessions
[s
->s_mds
] = NULL
;
457 ceph_con_close(&s
->s_con
);
458 ceph_put_mds_session(s
);
462 * drop session refs in request.
464 * should be last request ref, or hold mdsc->mutex
466 static void put_request_session(struct ceph_mds_request
*req
)
468 if (req
->r_session
) {
469 ceph_put_mds_session(req
->r_session
);
470 req
->r_session
= NULL
;
474 void ceph_mdsc_release_request(struct kref
*kref
)
476 struct ceph_mds_request
*req
= container_of(kref
,
477 struct ceph_mds_request
,
480 ceph_msg_put(req
->r_request
);
482 ceph_msg_put(req
->r_reply
);
483 destroy_reply_info(&req
->r_reply_info
);
486 ceph_put_cap_refs(ceph_inode(req
->r_inode
),
490 if (req
->r_locked_dir
)
491 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
),
493 if (req
->r_target_inode
)
494 iput(req
->r_target_inode
);
497 if (req
->r_old_dentry
) {
499 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
501 dput(req
->r_old_dentry
);
505 put_request_session(req
);
506 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
511 * lookup session, bump ref if found.
513 * called under mdsc->mutex.
515 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
518 struct ceph_mds_request
*req
;
519 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
522 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
523 if (tid
< req
->r_tid
)
525 else if (tid
> req
->r_tid
)
528 ceph_mdsc_get_request(req
);
535 static void __insert_request(struct ceph_mds_client
*mdsc
,
536 struct ceph_mds_request
*new)
538 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
539 struct rb_node
*parent
= NULL
;
540 struct ceph_mds_request
*req
= NULL
;
544 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
545 if (new->r_tid
< req
->r_tid
)
547 else if (new->r_tid
> req
->r_tid
)
553 rb_link_node(&new->r_node
, parent
, p
);
554 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
558 * Register an in-flight request, and assign a tid. Link to directory
559 * are modifying (if any).
561 * Called under mdsc->mutex.
563 static void __register_request(struct ceph_mds_client
*mdsc
,
564 struct ceph_mds_request
*req
,
567 req
->r_tid
= ++mdsc
->last_tid
;
569 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
571 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
572 ceph_mdsc_get_request(req
);
573 __insert_request(mdsc
, req
);
575 req
->r_uid
= current_fsuid();
576 req
->r_gid
= current_fsgid();
579 struct ceph_inode_info
*ci
= ceph_inode(dir
);
582 spin_lock(&ci
->i_unsafe_lock
);
583 req
->r_unsafe_dir
= dir
;
584 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
585 spin_unlock(&ci
->i_unsafe_lock
);
589 static void __unregister_request(struct ceph_mds_client
*mdsc
,
590 struct ceph_mds_request
*req
)
592 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
593 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
594 RB_CLEAR_NODE(&req
->r_node
);
596 if (req
->r_unsafe_dir
) {
597 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
599 spin_lock(&ci
->i_unsafe_lock
);
600 list_del_init(&req
->r_unsafe_dir_item
);
601 spin_unlock(&ci
->i_unsafe_lock
);
603 iput(req
->r_unsafe_dir
);
604 req
->r_unsafe_dir
= NULL
;
607 ceph_mdsc_put_request(req
);
611 * Choose mds to send request to next. If there is a hint set in the
612 * request (e.g., due to a prior forward hint from the mds), use that.
613 * Otherwise, consult frag tree and/or caps to identify the
614 * appropriate mds. If all else fails, choose randomly.
616 * Called under mdsc->mutex.
618 struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
620 while (!IS_ROOT(dentry
) && ceph_snap(dentry
->d_inode
) != CEPH_NOSNAP
)
621 dentry
= dentry
->d_parent
;
625 static int __choose_mds(struct ceph_mds_client
*mdsc
,
626 struct ceph_mds_request
*req
)
629 struct ceph_inode_info
*ci
;
630 struct ceph_cap
*cap
;
631 int mode
= req
->r_direct_mode
;
633 u32 hash
= req
->r_direct_hash
;
634 bool is_hash
= req
->r_direct_is_hash
;
637 * is there a specific mds we should try? ignore hint if we have
638 * no session and the mds is not up (active or recovering).
640 if (req
->r_resend_mds
>= 0 &&
641 (__have_session(mdsc
, req
->r_resend_mds
) ||
642 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
643 dout("choose_mds using resend_mds mds%d\n",
645 return req
->r_resend_mds
;
648 if (mode
== USE_RANDOM_MDS
)
653 inode
= req
->r_inode
;
654 } else if (req
->r_dentry
) {
655 struct inode
*dir
= req
->r_dentry
->d_parent
->d_inode
;
657 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
659 inode
= req
->r_dentry
->d_inode
;
660 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
661 /* direct snapped/virtual snapdir requests
662 * based on parent dir inode */
664 get_nonsnap_parent(req
->r_dentry
->d_parent
);
666 dout("__choose_mds using nonsnap parent %p\n", inode
);
667 } else if (req
->r_dentry
->d_inode
) {
669 inode
= req
->r_dentry
->d_inode
;
673 hash
= ceph_dentry_hash(req
->r_dentry
);
678 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
682 ci
= ceph_inode(inode
);
684 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
685 struct ceph_inode_frag frag
;
688 ceph_choose_frag(ci
, hash
, &frag
, &found
);
690 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
693 /* choose a random replica */
694 get_random_bytes(&r
, 1);
697 dout("choose_mds %p %llx.%llx "
698 "frag %u mds%d (%d/%d)\n",
699 inode
, ceph_vinop(inode
),
702 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
703 CEPH_MDS_STATE_ACTIVE
)
707 /* since this file/dir wasn't known to be
708 * replicated, then we want to look for the
709 * authoritative mds. */
712 /* choose auth mds */
714 dout("choose_mds %p %llx.%llx "
715 "frag %u mds%d (auth)\n",
716 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
717 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
718 CEPH_MDS_STATE_ACTIVE
)
724 spin_lock(&inode
->i_lock
);
726 if (mode
== USE_AUTH_MDS
)
727 cap
= ci
->i_auth_cap
;
728 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
729 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
731 spin_unlock(&inode
->i_lock
);
734 mds
= cap
->session
->s_mds
;
735 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
736 inode
, ceph_vinop(inode
), mds
,
737 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
738 spin_unlock(&inode
->i_lock
);
742 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
743 dout("choose_mds chose random mds%d\n", mds
);
751 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
753 struct ceph_msg
*msg
;
754 struct ceph_mds_session_head
*h
;
756 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
);
758 pr_err("create_session_msg ENOMEM creating msg\n");
761 h
= msg
->front
.iov_base
;
762 h
->op
= cpu_to_le32(op
);
763 h
->seq
= cpu_to_le64(seq
);
768 * send session open request.
770 * called under mdsc->mutex
772 static int __open_session(struct ceph_mds_client
*mdsc
,
773 struct ceph_mds_session
*session
)
775 struct ceph_msg
*msg
;
777 int mds
= session
->s_mds
;
779 /* wait for mds to go active? */
780 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
781 dout("open_session to mds%d (%s)\n", mds
,
782 ceph_mds_state_name(mstate
));
783 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
784 session
->s_renew_requested
= jiffies
;
786 /* send connect message */
787 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
790 ceph_con_send(&session
->s_con
, msg
);
795 * open sessions for any export targets for the given mds
797 * called under mdsc->mutex
799 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
800 struct ceph_mds_session
*session
)
802 struct ceph_mds_info
*mi
;
803 struct ceph_mds_session
*ts
;
804 int i
, mds
= session
->s_mds
;
807 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
809 mi
= &mdsc
->mdsmap
->m_info
[mds
];
810 dout("open_export_target_sessions for mds%d (%d targets)\n",
811 session
->s_mds
, mi
->num_export_targets
);
813 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
814 target
= mi
->export_targets
[i
];
815 ts
= __ceph_lookup_mds_session(mdsc
, target
);
817 ts
= register_session(mdsc
, target
);
821 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
822 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
823 __open_session(mdsc
, session
);
825 dout(" mds%d target mds%d %p is %s\n", session
->s_mds
,
826 i
, ts
, session_state_name(ts
->s_state
));
827 ceph_put_mds_session(ts
);
831 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
832 struct ceph_mds_session
*session
)
834 mutex_lock(&mdsc
->mutex
);
835 __open_export_target_sessions(mdsc
, session
);
836 mutex_unlock(&mdsc
->mutex
);
844 * Free preallocated cap messages assigned to this session
846 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
848 struct ceph_msg
*msg
;
850 spin_lock(&session
->s_cap_lock
);
851 while (!list_empty(&session
->s_cap_releases
)) {
852 msg
= list_first_entry(&session
->s_cap_releases
,
853 struct ceph_msg
, list_head
);
854 list_del_init(&msg
->list_head
);
857 while (!list_empty(&session
->s_cap_releases_done
)) {
858 msg
= list_first_entry(&session
->s_cap_releases_done
,
859 struct ceph_msg
, list_head
);
860 list_del_init(&msg
->list_head
);
863 spin_unlock(&session
->s_cap_lock
);
867 * Helper to safely iterate over all caps associated with a session, with
868 * special care taken to handle a racing __ceph_remove_cap().
870 * Caller must hold session s_mutex.
872 static int iterate_session_caps(struct ceph_mds_session
*session
,
873 int (*cb
)(struct inode
*, struct ceph_cap
*,
877 struct ceph_cap
*cap
;
878 struct inode
*inode
, *last_inode
= NULL
;
879 struct ceph_cap
*old_cap
= NULL
;
882 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
883 spin_lock(&session
->s_cap_lock
);
884 p
= session
->s_caps
.next
;
885 while (p
!= &session
->s_caps
) {
886 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
887 inode
= igrab(&cap
->ci
->vfs_inode
);
892 session
->s_cap_iterator
= cap
;
893 spin_unlock(&session
->s_cap_lock
);
900 ceph_put_cap(session
->s_mdsc
, old_cap
);
904 ret
= cb(inode
, cap
, arg
);
907 spin_lock(&session
->s_cap_lock
);
909 if (cap
->ci
== NULL
) {
910 dout("iterate_session_caps finishing cap %p removal\n",
912 BUG_ON(cap
->session
!= session
);
913 list_del_init(&cap
->session_caps
);
914 session
->s_nr_caps
--;
916 old_cap
= cap
; /* put_cap it w/o locks held */
923 session
->s_cap_iterator
= NULL
;
924 spin_unlock(&session
->s_cap_lock
);
929 ceph_put_cap(session
->s_mdsc
, old_cap
);
934 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
937 struct ceph_inode_info
*ci
= ceph_inode(inode
);
940 dout("removing cap %p, ci is %p, inode is %p\n",
941 cap
, ci
, &ci
->vfs_inode
);
942 spin_lock(&inode
->i_lock
);
943 __ceph_remove_cap(cap
);
944 if (!__ceph_is_any_real_caps(ci
)) {
945 struct ceph_mds_client
*mdsc
=
946 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
948 spin_lock(&mdsc
->cap_dirty_lock
);
949 if (!list_empty(&ci
->i_dirty_item
)) {
950 pr_info(" dropping dirty %s state for %p %lld\n",
951 ceph_cap_string(ci
->i_dirty_caps
),
952 inode
, ceph_ino(inode
));
953 ci
->i_dirty_caps
= 0;
954 list_del_init(&ci
->i_dirty_item
);
957 if (!list_empty(&ci
->i_flushing_item
)) {
958 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
959 ceph_cap_string(ci
->i_flushing_caps
),
960 inode
, ceph_ino(inode
));
961 ci
->i_flushing_caps
= 0;
962 list_del_init(&ci
->i_flushing_item
);
963 mdsc
->num_cap_flushing
--;
966 if (drop
&& ci
->i_wrbuffer_ref
) {
967 pr_info(" dropping dirty data for %p %lld\n",
968 inode
, ceph_ino(inode
));
969 ci
->i_wrbuffer_ref
= 0;
970 ci
->i_wrbuffer_ref_head
= 0;
973 spin_unlock(&mdsc
->cap_dirty_lock
);
975 spin_unlock(&inode
->i_lock
);
982 * caller must hold session s_mutex
984 static void remove_session_caps(struct ceph_mds_session
*session
)
986 dout("remove_session_caps on %p\n", session
);
987 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
988 BUG_ON(session
->s_nr_caps
> 0);
989 BUG_ON(!list_empty(&session
->s_cap_flushing
));
990 cleanup_cap_releases(session
);
994 * wake up any threads waiting on this session's caps. if the cap is
995 * old (didn't get renewed on the client reconnect), remove it now.
997 * caller must hold s_mutex.
999 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1002 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1004 wake_up_all(&ci
->i_cap_wq
);
1006 spin_lock(&inode
->i_lock
);
1007 ci
->i_wanted_max_size
= 0;
1008 ci
->i_requested_max_size
= 0;
1009 spin_unlock(&inode
->i_lock
);
1014 static void wake_up_session_caps(struct ceph_mds_session
*session
,
1017 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
1018 iterate_session_caps(session
, wake_up_session_cb
,
1019 (void *)(unsigned long)reconnect
);
1023 * Send periodic message to MDS renewing all currently held caps. The
1024 * ack will reset the expiration for all caps from this session.
1026 * caller holds s_mutex
1028 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
1029 struct ceph_mds_session
*session
)
1031 struct ceph_msg
*msg
;
1034 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
1035 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
1036 pr_info("mds%d caps stale\n", session
->s_mds
);
1037 session
->s_renew_requested
= jiffies
;
1039 /* do not try to renew caps until a recovering mds has reconnected
1040 * with its clients. */
1041 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
1042 if (state
< CEPH_MDS_STATE_RECONNECT
) {
1043 dout("send_renew_caps ignoring mds%d (%s)\n",
1044 session
->s_mds
, ceph_mds_state_name(state
));
1048 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
1049 ceph_mds_state_name(state
));
1050 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
1051 ++session
->s_renew_seq
);
1054 ceph_con_send(&session
->s_con
, msg
);
1059 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1061 * Called under session->s_mutex
1063 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1064 struct ceph_mds_session
*session
, int is_renew
)
1069 spin_lock(&session
->s_cap_lock
);
1070 was_stale
= is_renew
&& (session
->s_cap_ttl
== 0 ||
1071 time_after_eq(jiffies
, session
->s_cap_ttl
));
1073 session
->s_cap_ttl
= session
->s_renew_requested
+
1074 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1077 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1078 pr_info("mds%d caps renewed\n", session
->s_mds
);
1081 pr_info("mds%d caps still stale\n", session
->s_mds
);
1084 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1085 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1086 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1087 spin_unlock(&session
->s_cap_lock
);
1090 wake_up_session_caps(session
, 0);
1094 * send a session close request
1096 static int request_close_session(struct ceph_mds_client
*mdsc
,
1097 struct ceph_mds_session
*session
)
1099 struct ceph_msg
*msg
;
1101 dout("request_close_session mds%d state %s seq %lld\n",
1102 session
->s_mds
, session_state_name(session
->s_state
),
1104 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1107 ceph_con_send(&session
->s_con
, msg
);
1112 * Called with s_mutex held.
1114 static int __close_session(struct ceph_mds_client
*mdsc
,
1115 struct ceph_mds_session
*session
)
1117 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1119 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1120 return request_close_session(mdsc
, session
);
1124 * Trim old(er) caps.
1126 * Because we can't cache an inode without one or more caps, we do
1127 * this indirectly: if a cap is unused, we prune its aliases, at which
1128 * point the inode will hopefully get dropped to.
1130 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1131 * memory pressure from the MDS, though, so it needn't be perfect.
1133 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1135 struct ceph_mds_session
*session
= arg
;
1136 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1137 int used
, oissued
, mine
;
1139 if (session
->s_trim_caps
<= 0)
1142 spin_lock(&inode
->i_lock
);
1143 mine
= cap
->issued
| cap
->implemented
;
1144 used
= __ceph_caps_used(ci
);
1145 oissued
= __ceph_caps_issued_other(ci
, cap
);
1147 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
1148 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1149 ceph_cap_string(used
));
1150 if (ci
->i_dirty_caps
)
1151 goto out
; /* dirty caps */
1152 if ((used
& ~oissued
) & mine
)
1153 goto out
; /* we need these caps */
1155 session
->s_trim_caps
--;
1157 /* we aren't the only cap.. just remove us */
1158 __ceph_remove_cap(cap
);
1160 /* try to drop referring dentries */
1161 spin_unlock(&inode
->i_lock
);
1162 d_prune_aliases(inode
);
1163 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1164 inode
, cap
, atomic_read(&inode
->i_count
));
1169 spin_unlock(&inode
->i_lock
);
1174 * Trim session cap count down to some max number.
1176 static int trim_caps(struct ceph_mds_client
*mdsc
,
1177 struct ceph_mds_session
*session
,
1180 int trim_caps
= session
->s_nr_caps
- max_caps
;
1182 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1183 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1184 if (trim_caps
> 0) {
1185 session
->s_trim_caps
= trim_caps
;
1186 iterate_session_caps(session
, trim_caps_cb
, session
);
1187 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1188 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1189 trim_caps
- session
->s_trim_caps
);
1190 session
->s_trim_caps
= 0;
1196 * Allocate cap_release messages. If there is a partially full message
1197 * in the queue, try to allocate enough to cover it's remainder, so that
1198 * we can send it immediately.
1200 * Called under s_mutex.
1202 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1203 struct ceph_mds_session
*session
)
1205 struct ceph_msg
*msg
, *partial
= NULL
;
1206 struct ceph_mds_cap_release
*head
;
1208 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1211 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1214 spin_lock(&session
->s_cap_lock
);
1216 if (!list_empty(&session
->s_cap_releases
)) {
1217 msg
= list_first_entry(&session
->s_cap_releases
,
1220 head
= msg
->front
.iov_base
;
1221 num
= le32_to_cpu(head
->num
);
1223 dout(" partial %p with (%d/%d)\n", msg
, num
,
1224 (int)CEPH_CAPS_PER_RELEASE
);
1225 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1229 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1230 spin_unlock(&session
->s_cap_lock
);
1231 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1235 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1236 (int)msg
->front
.iov_len
);
1237 head
= msg
->front
.iov_base
;
1238 head
->num
= cpu_to_le32(0);
1239 msg
->front
.iov_len
= sizeof(*head
);
1240 spin_lock(&session
->s_cap_lock
);
1241 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1242 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1246 head
= partial
->front
.iov_base
;
1247 num
= le32_to_cpu(head
->num
);
1248 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1249 (int)CEPH_CAPS_PER_RELEASE
);
1250 list_move_tail(&partial
->list_head
,
1251 &session
->s_cap_releases_done
);
1252 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1255 spin_unlock(&session
->s_cap_lock
);
1261 * flush all dirty inode data to disk.
1263 * returns true if we've flushed through want_flush_seq
1265 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1269 dout("check_cap_flush want %lld\n", want_flush_seq
);
1270 mutex_lock(&mdsc
->mutex
);
1271 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1272 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1276 get_session(session
);
1277 mutex_unlock(&mdsc
->mutex
);
1279 mutex_lock(&session
->s_mutex
);
1280 if (!list_empty(&session
->s_cap_flushing
)) {
1281 struct ceph_inode_info
*ci
=
1282 list_entry(session
->s_cap_flushing
.next
,
1283 struct ceph_inode_info
,
1285 struct inode
*inode
= &ci
->vfs_inode
;
1287 spin_lock(&inode
->i_lock
);
1288 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1289 dout("check_cap_flush still flushing %p "
1290 "seq %lld <= %lld to mds%d\n", inode
,
1291 ci
->i_cap_flush_seq
, want_flush_seq
,
1295 spin_unlock(&inode
->i_lock
);
1297 mutex_unlock(&session
->s_mutex
);
1298 ceph_put_mds_session(session
);
1302 mutex_lock(&mdsc
->mutex
);
1305 mutex_unlock(&mdsc
->mutex
);
1306 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1311 * called under s_mutex
1313 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1314 struct ceph_mds_session
*session
)
1316 struct ceph_msg
*msg
;
1318 dout("send_cap_releases mds%d\n", session
->s_mds
);
1319 spin_lock(&session
->s_cap_lock
);
1320 while (!list_empty(&session
->s_cap_releases_done
)) {
1321 msg
= list_first_entry(&session
->s_cap_releases_done
,
1322 struct ceph_msg
, list_head
);
1323 list_del_init(&msg
->list_head
);
1324 spin_unlock(&session
->s_cap_lock
);
1325 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1326 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1327 ceph_con_send(&session
->s_con
, msg
);
1328 spin_lock(&session
->s_cap_lock
);
1330 spin_unlock(&session
->s_cap_lock
);
1333 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1334 struct ceph_mds_session
*session
)
1336 struct ceph_msg
*msg
;
1337 struct ceph_mds_cap_release
*head
;
1340 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1341 spin_lock(&session
->s_cap_lock
);
1343 /* zero out the in-progress message */
1344 msg
= list_first_entry(&session
->s_cap_releases
,
1345 struct ceph_msg
, list_head
);
1346 head
= msg
->front
.iov_base
;
1347 num
= le32_to_cpu(head
->num
);
1348 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
, num
);
1349 head
->num
= cpu_to_le32(0);
1350 session
->s_num_cap_releases
+= num
;
1352 /* requeue completed messages */
1353 while (!list_empty(&session
->s_cap_releases_done
)) {
1354 msg
= list_first_entry(&session
->s_cap_releases_done
,
1355 struct ceph_msg
, list_head
);
1356 list_del_init(&msg
->list_head
);
1358 head
= msg
->front
.iov_base
;
1359 num
= le32_to_cpu(head
->num
);
1360 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1362 session
->s_num_cap_releases
+= num
;
1363 head
->num
= cpu_to_le32(0);
1364 msg
->front
.iov_len
= sizeof(*head
);
1365 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1368 spin_unlock(&session
->s_cap_lock
);
1376 * Create an mds request.
1378 struct ceph_mds_request
*
1379 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1381 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1384 return ERR_PTR(-ENOMEM
);
1386 mutex_init(&req
->r_fill_mutex
);
1388 req
->r_started
= jiffies
;
1389 req
->r_resend_mds
= -1;
1390 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1392 kref_init(&req
->r_kref
);
1393 INIT_LIST_HEAD(&req
->r_wait
);
1394 init_completion(&req
->r_completion
);
1395 init_completion(&req
->r_safe_completion
);
1396 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1399 req
->r_direct_mode
= mode
;
1404 * return oldest (lowest) request, tid in request tree, 0 if none.
1406 * called under mdsc->mutex.
1408 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1410 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1412 return rb_entry(rb_first(&mdsc
->request_tree
),
1413 struct ceph_mds_request
, r_node
);
1416 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1418 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1426 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1427 * on build_path_from_dentry in fs/cifs/dir.c.
1429 * If @stop_on_nosnap, generate path relative to the first non-snapped
1432 * Encode hidden .snap dirs as a double /, i.e.
1433 * foo/.snap/bar -> foo//bar
1435 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1438 struct dentry
*temp
;
1443 return ERR_PTR(-EINVAL
);
1447 for (temp
= dentry
; !IS_ROOT(temp
);) {
1448 struct inode
*inode
= temp
->d_inode
;
1449 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1450 len
++; /* slash only */
1451 else if (stop_on_nosnap
&& inode
&&
1452 ceph_snap(inode
) == CEPH_NOSNAP
)
1455 len
+= 1 + temp
->d_name
.len
;
1456 temp
= temp
->d_parent
;
1458 pr_err("build_path corrupt dentry %p\n", dentry
);
1459 return ERR_PTR(-EINVAL
);
1463 len
--; /* no leading '/' */
1465 path
= kmalloc(len
+1, GFP_NOFS
);
1467 return ERR_PTR(-ENOMEM
);
1469 path
[pos
] = 0; /* trailing null */
1470 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1471 struct inode
*inode
= temp
->d_inode
;
1473 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1474 dout("build_path path+%d: %p SNAPDIR\n",
1476 } else if (stop_on_nosnap
&& inode
&&
1477 ceph_snap(inode
) == CEPH_NOSNAP
) {
1480 pos
-= temp
->d_name
.len
;
1483 strncpy(path
+ pos
, temp
->d_name
.name
,
1488 temp
= temp
->d_parent
;
1490 pr_err("build_path corrupt dentry\n");
1492 return ERR_PTR(-EINVAL
);
1496 pr_err("build_path did not end path lookup where "
1497 "expected, namelen is %d, pos is %d\n", len
, pos
);
1498 /* presumably this is only possible if racing with a
1499 rename of one of the parent directories (we can not
1500 lock the dentries above us to prevent this, but
1501 retrying should be harmless) */
1506 *base
= ceph_ino(temp
->d_inode
);
1508 dout("build_path on %p %d built %llx '%.*s'\n",
1509 dentry
, dentry
->d_count
, *base
, len
, path
);
1513 static int build_dentry_path(struct dentry
*dentry
,
1514 const char **ppath
, int *ppathlen
, u64
*pino
,
1519 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1520 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1521 *ppath
= dentry
->d_name
.name
;
1522 *ppathlen
= dentry
->d_name
.len
;
1525 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1527 return PTR_ERR(path
);
1533 static int build_inode_path(struct inode
*inode
,
1534 const char **ppath
, int *ppathlen
, u64
*pino
,
1537 struct dentry
*dentry
;
1540 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1541 *pino
= ceph_ino(inode
);
1545 dentry
= d_find_alias(inode
);
1546 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1549 return PTR_ERR(path
);
1556 * request arguments may be specified via an inode *, a dentry *, or
1557 * an explicit ino+path.
1559 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1560 const char *rpath
, u64 rino
,
1561 const char **ppath
, int *pathlen
,
1562 u64
*ino
, int *freepath
)
1567 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1568 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1570 } else if (rdentry
) {
1571 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1572 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1577 *pathlen
= strlen(rpath
);
1578 dout(" path %.*s\n", *pathlen
, rpath
);
1585 * called under mdsc->mutex
1587 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1588 struct ceph_mds_request
*req
,
1591 struct ceph_msg
*msg
;
1592 struct ceph_mds_request_head
*head
;
1593 const char *path1
= NULL
;
1594 const char *path2
= NULL
;
1595 u64 ino1
= 0, ino2
= 0;
1596 int pathlen1
= 0, pathlen2
= 0;
1597 int freepath1
= 0, freepath2
= 0;
1603 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1604 req
->r_path1
, req
->r_ino1
.ino
,
1605 &path1
, &pathlen1
, &ino1
, &freepath1
);
1611 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1612 req
->r_path2
, req
->r_ino2
.ino
,
1613 &path2
, &pathlen2
, &ino2
, &freepath2
);
1619 len
= sizeof(*head
) +
1620 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1622 /* calculate (max) length for cap releases */
1623 len
+= sizeof(struct ceph_mds_request_release
) *
1624 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1625 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1626 if (req
->r_dentry_drop
)
1627 len
+= req
->r_dentry
->d_name
.len
;
1628 if (req
->r_old_dentry_drop
)
1629 len
+= req
->r_old_dentry
->d_name
.len
;
1631 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
);
1633 msg
= ERR_PTR(-ENOMEM
);
1637 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1639 head
= msg
->front
.iov_base
;
1640 p
= msg
->front
.iov_base
+ sizeof(*head
);
1641 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1643 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1644 head
->op
= cpu_to_le32(req
->r_op
);
1645 head
->caller_uid
= cpu_to_le32(req
->r_uid
);
1646 head
->caller_gid
= cpu_to_le32(req
->r_gid
);
1647 head
->args
= req
->r_args
;
1649 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1650 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1652 /* make note of release offset, in case we need to replay */
1653 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1657 if (req
->r_inode_drop
)
1658 releases
+= ceph_encode_inode_release(&p
,
1659 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1660 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1661 if (req
->r_dentry_drop
)
1662 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1663 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1664 if (req
->r_old_dentry_drop
)
1665 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1666 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1667 if (req
->r_old_inode_drop
)
1668 releases
+= ceph_encode_inode_release(&p
,
1669 req
->r_old_dentry
->d_inode
,
1670 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1671 head
->num_releases
= cpu_to_le16(releases
);
1674 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1675 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1677 msg
->pages
= req
->r_pages
;
1678 msg
->nr_pages
= req
->r_num_pages
;
1679 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1680 msg
->hdr
.data_off
= cpu_to_le16(0);
1684 kfree((char *)path2
);
1687 kfree((char *)path1
);
1693 * called under mdsc->mutex if error, under no mutex if
1696 static void complete_request(struct ceph_mds_client
*mdsc
,
1697 struct ceph_mds_request
*req
)
1699 if (req
->r_callback
)
1700 req
->r_callback(mdsc
, req
);
1702 complete_all(&req
->r_completion
);
1706 * called under mdsc->mutex
1708 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1709 struct ceph_mds_request
*req
,
1712 struct ceph_mds_request_head
*rhead
;
1713 struct ceph_msg
*msg
;
1718 struct ceph_cap
*cap
=
1719 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
1722 req
->r_sent_on_mseq
= cap
->mseq
;
1724 req
->r_sent_on_mseq
= -1;
1726 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1727 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1729 if (req
->r_got_unsafe
) {
1731 * Replay. Do not regenerate message (and rebuild
1732 * paths, etc.); just use the original message.
1733 * Rebuilding paths will break for renames because
1734 * d_move mangles the src name.
1736 msg
= req
->r_request
;
1737 rhead
= msg
->front
.iov_base
;
1739 flags
= le32_to_cpu(rhead
->flags
);
1740 flags
|= CEPH_MDS_FLAG_REPLAY
;
1741 rhead
->flags
= cpu_to_le32(flags
);
1743 if (req
->r_target_inode
)
1744 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1746 rhead
->num_retry
= req
->r_attempts
- 1;
1748 /* remove cap/dentry releases from message */
1749 rhead
->num_releases
= 0;
1750 msg
->hdr
.front_len
= cpu_to_le32(req
->r_request_release_offset
);
1751 msg
->front
.iov_len
= req
->r_request_release_offset
;
1755 if (req
->r_request
) {
1756 ceph_msg_put(req
->r_request
);
1757 req
->r_request
= NULL
;
1759 msg
= create_request_message(mdsc
, req
, mds
);
1761 req
->r_err
= PTR_ERR(msg
);
1762 complete_request(mdsc
, req
);
1763 return PTR_ERR(msg
);
1765 req
->r_request
= msg
;
1767 rhead
= msg
->front
.iov_base
;
1768 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1769 if (req
->r_got_unsafe
)
1770 flags
|= CEPH_MDS_FLAG_REPLAY
;
1771 if (req
->r_locked_dir
)
1772 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1773 rhead
->flags
= cpu_to_le32(flags
);
1774 rhead
->num_fwd
= req
->r_num_fwd
;
1775 rhead
->num_retry
= req
->r_attempts
- 1;
1778 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1783 * send request, or put it on the appropriate wait list.
1785 static int __do_request(struct ceph_mds_client
*mdsc
,
1786 struct ceph_mds_request
*req
)
1788 struct ceph_mds_session
*session
= NULL
;
1792 if (req
->r_err
|| req
->r_got_result
)
1795 if (req
->r_timeout
&&
1796 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1797 dout("do_request timed out\n");
1802 put_request_session(req
);
1804 mds
= __choose_mds(mdsc
, req
);
1806 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1807 dout("do_request no mds or not active, waiting for map\n");
1808 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1812 /* get, open session */
1813 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1815 session
= register_session(mdsc
, mds
);
1816 if (IS_ERR(session
)) {
1817 err
= PTR_ERR(session
);
1821 req
->r_session
= get_session(session
);
1823 dout("do_request mds%d session %p state %s\n", mds
, session
,
1824 session_state_name(session
->s_state
));
1825 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1826 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
1827 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
1828 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
1829 __open_session(mdsc
, session
);
1830 list_add(&req
->r_wait
, &session
->s_waiting
);
1835 req
->r_resend_mds
= -1; /* forget any previous mds hint */
1837 if (req
->r_request_started
== 0) /* note request start time */
1838 req
->r_request_started
= jiffies
;
1840 err
= __prepare_send_request(mdsc
, req
, mds
);
1842 ceph_msg_get(req
->r_request
);
1843 ceph_con_send(&session
->s_con
, req
->r_request
);
1847 ceph_put_mds_session(session
);
1853 complete_request(mdsc
, req
);
1858 * called under mdsc->mutex
1860 static void __wake_requests(struct ceph_mds_client
*mdsc
,
1861 struct list_head
*head
)
1863 struct ceph_mds_request
*req
, *nreq
;
1865 list_for_each_entry_safe(req
, nreq
, head
, r_wait
) {
1866 list_del_init(&req
->r_wait
);
1867 __do_request(mdsc
, req
);
1872 * Wake up threads with requests pending for @mds, so that they can
1873 * resubmit their requests to a possibly different mds.
1875 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
1877 struct ceph_mds_request
*req
;
1880 dout("kick_requests mds%d\n", mds
);
1881 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
1882 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1883 if (req
->r_got_unsafe
)
1885 if (req
->r_session
&&
1886 req
->r_session
->s_mds
== mds
) {
1887 dout(" kicking tid %llu\n", req
->r_tid
);
1888 __do_request(mdsc
, req
);
1893 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
1894 struct ceph_mds_request
*req
)
1896 dout("submit_request on %p\n", req
);
1897 mutex_lock(&mdsc
->mutex
);
1898 __register_request(mdsc
, req
, NULL
);
1899 __do_request(mdsc
, req
);
1900 mutex_unlock(&mdsc
->mutex
);
1904 * Synchrously perform an mds request. Take care of all of the
1905 * session setup, forwarding, retry details.
1907 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
1909 struct ceph_mds_request
*req
)
1913 dout("do_request on %p\n", req
);
1915 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1917 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
1918 if (req
->r_locked_dir
)
1919 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
1920 if (req
->r_old_dentry
)
1922 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
1926 mutex_lock(&mdsc
->mutex
);
1927 __register_request(mdsc
, req
, dir
);
1928 __do_request(mdsc
, req
);
1932 __unregister_request(mdsc
, req
);
1933 dout("do_request early error %d\n", err
);
1938 mutex_unlock(&mdsc
->mutex
);
1939 dout("do_request waiting\n");
1940 if (req
->r_timeout
) {
1941 err
= (long)wait_for_completion_killable_timeout(
1942 &req
->r_completion
, req
->r_timeout
);
1946 err
= wait_for_completion_killable(&req
->r_completion
);
1948 dout("do_request waited, got %d\n", err
);
1949 mutex_lock(&mdsc
->mutex
);
1951 /* only abort if we didn't race with a real reply */
1952 if (req
->r_got_result
) {
1953 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
1954 } else if (err
< 0) {
1955 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
1958 * ensure we aren't running concurrently with
1959 * ceph_fill_trace or ceph_readdir_prepopulate, which
1960 * rely on locks (dir mutex) held by our caller.
1962 mutex_lock(&req
->r_fill_mutex
);
1964 req
->r_aborted
= true;
1965 mutex_unlock(&req
->r_fill_mutex
);
1967 if (req
->r_locked_dir
&&
1968 (req
->r_op
& CEPH_MDS_OP_WRITE
))
1969 ceph_invalidate_dir_request(req
);
1975 mutex_unlock(&mdsc
->mutex
);
1976 dout("do_request %p done, result %d\n", req
, err
);
1981 * Invalidate dir I_COMPLETE, dentry lease state on an aborted MDS
1982 * namespace request.
1984 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
1986 struct inode
*inode
= req
->r_locked_dir
;
1987 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1989 dout("invalidate_dir_request %p (I_COMPLETE, lease(s))\n", inode
);
1990 spin_lock(&inode
->i_lock
);
1991 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1992 ci
->i_release_count
++;
1993 spin_unlock(&inode
->i_lock
);
1996 ceph_invalidate_dentry_lease(req
->r_dentry
);
1997 if (req
->r_old_dentry
)
1998 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
2004 * We take the session mutex and parse and process the reply immediately.
2005 * This preserves the logical ordering of replies, capabilities, etc., sent
2006 * by the MDS as they are applied to our local cache.
2008 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
2010 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2011 struct ceph_mds_request
*req
;
2012 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
2013 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
2016 int mds
= session
->s_mds
;
2018 if (msg
->front
.iov_len
< sizeof(*head
)) {
2019 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2024 /* get request, session */
2025 tid
= le64_to_cpu(msg
->hdr
.tid
);
2026 mutex_lock(&mdsc
->mutex
);
2027 req
= __lookup_request(mdsc
, tid
);
2029 dout("handle_reply on unknown tid %llu\n", tid
);
2030 mutex_unlock(&mdsc
->mutex
);
2033 dout("handle_reply %p\n", req
);
2035 /* correct session? */
2036 if (req
->r_session
!= session
) {
2037 pr_err("mdsc_handle_reply got %llu on session mds%d"
2038 " not mds%d\n", tid
, session
->s_mds
,
2039 req
->r_session
? req
->r_session
->s_mds
: -1);
2040 mutex_unlock(&mdsc
->mutex
);
2045 if ((req
->r_got_unsafe
&& !head
->safe
) ||
2046 (req
->r_got_safe
&& head
->safe
)) {
2047 pr_warning("got a dup %s reply on %llu from mds%d\n",
2048 head
->safe
? "safe" : "unsafe", tid
, mds
);
2049 mutex_unlock(&mdsc
->mutex
);
2052 if (req
->r_got_safe
&& !head
->safe
) {
2053 pr_warning("got unsafe after safe on %llu from mds%d\n",
2055 mutex_unlock(&mdsc
->mutex
);
2059 result
= le32_to_cpu(head
->result
);
2063 * if we're not talking to the authority, send to them
2064 * if the authority has changed while we weren't looking,
2065 * send to new authority
2066 * Otherwise we just have to return an ESTALE
2068 if (result
== -ESTALE
) {
2069 dout("got ESTALE on request %llu", req
->r_tid
);
2070 if (!req
->r_inode
) {
2071 /* do nothing; not an authority problem */
2072 } else if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2073 dout("not using auth, setting for that now");
2074 req
->r_direct_mode
= USE_AUTH_MDS
;
2075 __do_request(mdsc
, req
);
2076 mutex_unlock(&mdsc
->mutex
);
2079 struct ceph_inode_info
*ci
= ceph_inode(req
->r_inode
);
2080 struct ceph_cap
*cap
= NULL
;
2083 cap
= ceph_get_cap_for_mds(ci
,
2084 req
->r_session
->s_mds
);
2086 dout("already using auth");
2087 if ((!cap
|| cap
!= ci
->i_auth_cap
) ||
2088 (cap
->mseq
!= req
->r_sent_on_mseq
)) {
2089 dout("but cap changed, so resending");
2090 __do_request(mdsc
, req
);
2091 mutex_unlock(&mdsc
->mutex
);
2095 dout("have to return ESTALE on request %llu", req
->r_tid
);
2100 req
->r_got_safe
= true;
2101 __unregister_request(mdsc
, req
);
2102 complete_all(&req
->r_safe_completion
);
2104 if (req
->r_got_unsafe
) {
2106 * We already handled the unsafe response, now do the
2107 * cleanup. No need to examine the response; the MDS
2108 * doesn't include any result info in the safe
2109 * response. And even if it did, there is nothing
2110 * useful we could do with a revised return value.
2112 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2113 list_del_init(&req
->r_unsafe_item
);
2115 /* last unsafe request during umount? */
2116 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2117 complete_all(&mdsc
->safe_umount_waiters
);
2118 mutex_unlock(&mdsc
->mutex
);
2122 req
->r_got_unsafe
= true;
2123 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2126 dout("handle_reply tid %lld result %d\n", tid
, result
);
2127 rinfo
= &req
->r_reply_info
;
2128 err
= parse_reply_info(msg
, rinfo
, session
->s_con
.peer_features
);
2129 mutex_unlock(&mdsc
->mutex
);
2131 mutex_lock(&session
->s_mutex
);
2133 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds
, tid
);
2139 if (rinfo
->snapblob_len
) {
2140 down_write(&mdsc
->snap_rwsem
);
2141 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2142 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2143 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
2144 downgrade_write(&mdsc
->snap_rwsem
);
2146 down_read(&mdsc
->snap_rwsem
);
2149 /* insert trace into our cache */
2150 mutex_lock(&req
->r_fill_mutex
);
2151 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2153 if (result
== 0 && req
->r_op
!= CEPH_MDS_OP_GETFILELOCK
&&
2155 ceph_readdir_prepopulate(req
, req
->r_session
);
2156 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2158 mutex_unlock(&req
->r_fill_mutex
);
2160 up_read(&mdsc
->snap_rwsem
);
2162 mutex_lock(&mdsc
->mutex
);
2163 if (!req
->r_aborted
) {
2169 req
->r_got_result
= true;
2172 dout("reply arrived after request %lld was aborted\n", tid
);
2174 mutex_unlock(&mdsc
->mutex
);
2176 ceph_add_cap_releases(mdsc
, req
->r_session
);
2177 mutex_unlock(&session
->s_mutex
);
2179 /* kick calling process */
2180 complete_request(mdsc
, req
);
2182 ceph_mdsc_put_request(req
);
2189 * handle mds notification that our request has been forwarded.
2191 static void handle_forward(struct ceph_mds_client
*mdsc
,
2192 struct ceph_mds_session
*session
,
2193 struct ceph_msg
*msg
)
2195 struct ceph_mds_request
*req
;
2196 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2200 void *p
= msg
->front
.iov_base
;
2201 void *end
= p
+ msg
->front
.iov_len
;
2203 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2204 next_mds
= ceph_decode_32(&p
);
2205 fwd_seq
= ceph_decode_32(&p
);
2207 mutex_lock(&mdsc
->mutex
);
2208 req
= __lookup_request(mdsc
, tid
);
2210 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2211 goto out
; /* dup reply? */
2214 if (req
->r_aborted
) {
2215 dout("forward tid %llu aborted, unregistering\n", tid
);
2216 __unregister_request(mdsc
, req
);
2217 } else if (fwd_seq
<= req
->r_num_fwd
) {
2218 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2219 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2221 /* resend. forward race not possible; mds would drop */
2222 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2224 BUG_ON(req
->r_got_result
);
2225 req
->r_num_fwd
= fwd_seq
;
2226 req
->r_resend_mds
= next_mds
;
2227 put_request_session(req
);
2228 __do_request(mdsc
, req
);
2230 ceph_mdsc_put_request(req
);
2232 mutex_unlock(&mdsc
->mutex
);
2236 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2240 * handle a mds session control message
2242 static void handle_session(struct ceph_mds_session
*session
,
2243 struct ceph_msg
*msg
)
2245 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2248 int mds
= session
->s_mds
;
2249 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2253 if (msg
->front
.iov_len
!= sizeof(*h
))
2255 op
= le32_to_cpu(h
->op
);
2256 seq
= le64_to_cpu(h
->seq
);
2258 mutex_lock(&mdsc
->mutex
);
2259 if (op
== CEPH_SESSION_CLOSE
)
2260 __unregister_session(mdsc
, session
);
2261 /* FIXME: this ttl calculation is generous */
2262 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2263 mutex_unlock(&mdsc
->mutex
);
2265 mutex_lock(&session
->s_mutex
);
2267 dout("handle_session mds%d %s %p state %s seq %llu\n",
2268 mds
, ceph_session_op_name(op
), session
,
2269 session_state_name(session
->s_state
), seq
);
2271 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2272 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2273 pr_info("mds%d came back\n", session
->s_mds
);
2277 case CEPH_SESSION_OPEN
:
2278 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2279 pr_info("mds%d reconnect success\n", session
->s_mds
);
2280 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2281 renewed_caps(mdsc
, session
, 0);
2284 __close_session(mdsc
, session
);
2287 case CEPH_SESSION_RENEWCAPS
:
2288 if (session
->s_renew_seq
== seq
)
2289 renewed_caps(mdsc
, session
, 1);
2292 case CEPH_SESSION_CLOSE
:
2293 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2294 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2295 remove_session_caps(session
);
2296 wake
= 1; /* for good measure */
2297 wake_up_all(&mdsc
->session_close_wq
);
2298 kick_requests(mdsc
, mds
);
2301 case CEPH_SESSION_STALE
:
2302 pr_info("mds%d caps went stale, renewing\n",
2304 spin_lock(&session
->s_cap_lock
);
2305 session
->s_cap_gen
++;
2306 session
->s_cap_ttl
= 0;
2307 spin_unlock(&session
->s_cap_lock
);
2308 send_renew_caps(mdsc
, session
);
2311 case CEPH_SESSION_RECALL_STATE
:
2312 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2316 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2320 mutex_unlock(&session
->s_mutex
);
2322 mutex_lock(&mdsc
->mutex
);
2323 __wake_requests(mdsc
, &session
->s_waiting
);
2324 mutex_unlock(&mdsc
->mutex
);
2329 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2330 (int)msg
->front
.iov_len
);
2337 * called under session->mutex.
2339 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2340 struct ceph_mds_session
*session
)
2342 struct ceph_mds_request
*req
, *nreq
;
2345 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2347 mutex_lock(&mdsc
->mutex
);
2348 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2349 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2351 ceph_msg_get(req
->r_request
);
2352 ceph_con_send(&session
->s_con
, req
->r_request
);
2355 mutex_unlock(&mdsc
->mutex
);
2359 * Encode information about a cap for a reconnect with the MDS.
2361 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2365 struct ceph_mds_cap_reconnect v2
;
2366 struct ceph_mds_cap_reconnect_v1 v1
;
2369 struct ceph_inode_info
*ci
;
2370 struct ceph_reconnect_state
*recon_state
= arg
;
2371 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2375 struct dentry
*dentry
;
2379 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2380 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2381 ceph_cap_string(cap
->issued
));
2382 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2386 dentry
= d_find_alias(inode
);
2388 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2390 err
= PTR_ERR(path
);
2397 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2401 spin_lock(&inode
->i_lock
);
2402 cap
->seq
= 0; /* reset cap seq */
2403 cap
->issue_seq
= 0; /* and issue_seq */
2405 if (recon_state
->flock
) {
2406 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2407 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2408 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2409 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2410 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2411 rec
.v2
.flock_len
= 0;
2412 reclen
= sizeof(rec
.v2
);
2414 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2415 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2416 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2417 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2418 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2419 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2420 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2421 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2422 reclen
= sizeof(rec
.v1
);
2424 spin_unlock(&inode
->i_lock
);
2426 if (recon_state
->flock
) {
2427 int num_fcntl_locks
, num_flock_locks
;
2428 struct ceph_pagelist_cursor trunc_point
;
2430 ceph_pagelist_set_cursor(pagelist
, &trunc_point
);
2433 ceph_count_locks(inode
, &num_fcntl_locks
,
2435 rec
.v2
.flock_len
= (2*sizeof(u32
) +
2436 (num_fcntl_locks
+num_flock_locks
) *
2437 sizeof(struct ceph_filelock
));
2440 /* pre-alloc pagelist */
2441 ceph_pagelist_truncate(pagelist
, &trunc_point
);
2442 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2444 err
= ceph_pagelist_reserve(pagelist
,
2450 err
= ceph_encode_locks(inode
,
2456 } while (err
== -ENOSPC
);
2458 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2470 * If an MDS fails and recovers, clients need to reconnect in order to
2471 * reestablish shared state. This includes all caps issued through
2472 * this session _and_ the snap_realm hierarchy. Because it's not
2473 * clear which snap realms the mds cares about, we send everything we
2474 * know about.. that ensures we'll then get any new info the
2475 * recovering MDS might have.
2477 * This is a relatively heavyweight operation, but it's rare.
2479 * called with mdsc->mutex held.
2481 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2482 struct ceph_mds_session
*session
)
2484 struct ceph_msg
*reply
;
2486 int mds
= session
->s_mds
;
2488 struct ceph_pagelist
*pagelist
;
2489 struct ceph_reconnect_state recon_state
;
2491 pr_info("mds%d reconnect start\n", mds
);
2493 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2495 goto fail_nopagelist
;
2496 ceph_pagelist_init(pagelist
);
2498 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
);
2502 mutex_lock(&session
->s_mutex
);
2503 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2506 ceph_con_open(&session
->s_con
,
2507 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2509 /* replay unsafe requests */
2510 replay_unsafe_requests(mdsc
, session
);
2512 down_read(&mdsc
->snap_rwsem
);
2514 dout("session %p state %s\n", session
,
2515 session_state_name(session
->s_state
));
2517 /* drop old cap expires; we're about to reestablish that state */
2518 discard_cap_releases(mdsc
, session
);
2520 /* traverse this session's caps */
2521 err
= ceph_pagelist_encode_32(pagelist
, session
->s_nr_caps
);
2525 recon_state
.pagelist
= pagelist
;
2526 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2527 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2532 * snaprealms. we provide mds with the ino, seq (version), and
2533 * parent for all of our realms. If the mds has any newer info,
2536 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2537 struct ceph_snap_realm
*realm
=
2538 rb_entry(p
, struct ceph_snap_realm
, node
);
2539 struct ceph_mds_snaprealm_reconnect sr_rec
;
2541 dout(" adding snap realm %llx seq %lld parent %llx\n",
2542 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2543 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2544 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2545 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2546 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2551 reply
->pagelist
= pagelist
;
2552 if (recon_state
.flock
)
2553 reply
->hdr
.version
= cpu_to_le16(2);
2554 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2555 reply
->nr_pages
= calc_pages_for(0, pagelist
->length
);
2556 ceph_con_send(&session
->s_con
, reply
);
2558 mutex_unlock(&session
->s_mutex
);
2560 mutex_lock(&mdsc
->mutex
);
2561 __wake_requests(mdsc
, &session
->s_waiting
);
2562 mutex_unlock(&mdsc
->mutex
);
2564 up_read(&mdsc
->snap_rwsem
);
2568 ceph_msg_put(reply
);
2569 up_read(&mdsc
->snap_rwsem
);
2570 mutex_unlock(&session
->s_mutex
);
2572 ceph_pagelist_release(pagelist
);
2575 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2581 * compare old and new mdsmaps, kicking requests
2582 * and closing out old connections as necessary
2584 * called under mdsc->mutex.
2586 static void check_new_map(struct ceph_mds_client
*mdsc
,
2587 struct ceph_mdsmap
*newmap
,
2588 struct ceph_mdsmap
*oldmap
)
2591 int oldstate
, newstate
;
2592 struct ceph_mds_session
*s
;
2594 dout("check_new_map new %u old %u\n",
2595 newmap
->m_epoch
, oldmap
->m_epoch
);
2597 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2598 if (mdsc
->sessions
[i
] == NULL
)
2600 s
= mdsc
->sessions
[i
];
2601 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2602 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2604 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2605 i
, ceph_mds_state_name(oldstate
),
2606 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
2607 ceph_mds_state_name(newstate
),
2608 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
2609 session_state_name(s
->s_state
));
2611 if (memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2612 ceph_mdsmap_get_addr(newmap
, i
),
2613 sizeof(struct ceph_entity_addr
))) {
2614 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2615 /* the session never opened, just close it
2617 __wake_requests(mdsc
, &s
->s_waiting
);
2618 __unregister_session(mdsc
, s
);
2621 mutex_unlock(&mdsc
->mutex
);
2622 mutex_lock(&s
->s_mutex
);
2623 mutex_lock(&mdsc
->mutex
);
2624 ceph_con_close(&s
->s_con
);
2625 mutex_unlock(&s
->s_mutex
);
2626 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2629 /* kick any requests waiting on the recovering mds */
2630 kick_requests(mdsc
, i
);
2631 } else if (oldstate
== newstate
) {
2632 continue; /* nothing new with this mds */
2638 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2639 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
2640 mutex_unlock(&mdsc
->mutex
);
2641 send_mds_reconnect(mdsc
, s
);
2642 mutex_lock(&mdsc
->mutex
);
2646 * kick request on any mds that has gone active.
2648 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2649 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2650 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
2651 oldstate
!= CEPH_MDS_STATE_STARTING
)
2652 pr_info("mds%d recovery completed\n", s
->s_mds
);
2653 kick_requests(mdsc
, i
);
2654 ceph_kick_flushing_caps(mdsc
, s
);
2655 wake_up_session_caps(s
, 1);
2659 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2660 s
= mdsc
->sessions
[i
];
2663 if (!ceph_mdsmap_is_laggy(newmap
, i
))
2665 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2666 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
2667 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2668 dout(" connecting to export targets of laggy mds%d\n",
2670 __open_export_target_sessions(mdsc
, s
);
2682 * caller must hold session s_mutex, dentry->d_lock
2684 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2686 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2688 ceph_put_mds_session(di
->lease_session
);
2689 di
->lease_session
= NULL
;
2692 static void handle_lease(struct ceph_mds_client
*mdsc
,
2693 struct ceph_mds_session
*session
,
2694 struct ceph_msg
*msg
)
2696 struct super_block
*sb
= mdsc
->fsc
->sb
;
2697 struct inode
*inode
;
2698 struct dentry
*parent
, *dentry
;
2699 struct ceph_dentry_info
*di
;
2700 int mds
= session
->s_mds
;
2701 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2703 struct ceph_vino vino
;
2708 dout("handle_lease from mds%d\n", mds
);
2711 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2713 vino
.ino
= le64_to_cpu(h
->ino
);
2714 vino
.snap
= CEPH_NOSNAP
;
2715 mask
= le16_to_cpu(h
->mask
);
2716 seq
= le32_to_cpu(h
->seq
);
2717 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2718 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2719 if (dname
.len
!= get_unaligned_le32(h
+1))
2722 mutex_lock(&session
->s_mutex
);
2726 inode
= ceph_find_inode(sb
, vino
);
2727 dout("handle_lease %s, mask %d, ino %llx %p %.*s\n",
2728 ceph_lease_op_name(h
->action
), mask
, vino
.ino
, inode
,
2729 dname
.len
, dname
.name
);
2730 if (inode
== NULL
) {
2731 dout("handle_lease no inode %llx\n", vino
.ino
);
2736 parent
= d_find_alias(inode
);
2738 dout("no parent dentry on inode %p\n", inode
);
2740 goto release
; /* hrm... */
2742 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2743 dentry
= d_lookup(parent
, &dname
);
2748 spin_lock(&dentry
->d_lock
);
2749 di
= ceph_dentry(dentry
);
2750 switch (h
->action
) {
2751 case CEPH_MDS_LEASE_REVOKE
:
2752 if (di
&& di
->lease_session
== session
) {
2753 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
2754 h
->seq
= cpu_to_le32(di
->lease_seq
);
2755 __ceph_mdsc_drop_dentry_lease(dentry
);
2760 case CEPH_MDS_LEASE_RENEW
:
2761 if (di
&& di
->lease_session
== session
&&
2762 di
->lease_gen
== session
->s_cap_gen
&&
2763 di
->lease_renew_from
&&
2764 di
->lease_renew_after
== 0) {
2765 unsigned long duration
=
2766 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2768 di
->lease_seq
= seq
;
2769 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2770 di
->lease_renew_after
= di
->lease_renew_from
+
2772 di
->lease_renew_from
= 0;
2776 spin_unlock(&dentry
->d_lock
);
2783 /* let's just reuse the same message */
2784 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2786 ceph_con_send(&session
->s_con
, msg
);
2790 mutex_unlock(&session
->s_mutex
);
2794 pr_err("corrupt lease message\n");
2798 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
2799 struct inode
*inode
,
2800 struct dentry
*dentry
, char action
,
2803 struct ceph_msg
*msg
;
2804 struct ceph_mds_lease
*lease
;
2805 int len
= sizeof(*lease
) + sizeof(u32
);
2808 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2809 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
2810 dnamelen
= dentry
->d_name
.len
;
2813 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
);
2816 lease
= msg
->front
.iov_base
;
2817 lease
->action
= action
;
2818 lease
->mask
= cpu_to_le16(1);
2819 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
2820 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
2821 lease
->seq
= cpu_to_le32(seq
);
2822 put_unaligned_le32(dnamelen
, lease
+ 1);
2823 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
2826 * if this is a preemptive lease RELEASE, no need to
2827 * flush request stream, since the actual request will
2830 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
2832 ceph_con_send(&session
->s_con
, msg
);
2836 * Preemptively release a lease we expect to invalidate anyway.
2837 * Pass @inode always, @dentry is optional.
2839 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
2840 struct dentry
*dentry
, int mask
)
2842 struct ceph_dentry_info
*di
;
2843 struct ceph_mds_session
*session
;
2846 BUG_ON(inode
== NULL
);
2847 BUG_ON(dentry
== NULL
);
2850 /* is dentry lease valid? */
2851 spin_lock(&dentry
->d_lock
);
2852 di
= ceph_dentry(dentry
);
2853 if (!di
|| !di
->lease_session
||
2854 di
->lease_session
->s_mds
< 0 ||
2855 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
2856 !time_before(jiffies
, dentry
->d_time
)) {
2857 dout("lease_release inode %p dentry %p -- "
2859 inode
, dentry
, mask
);
2860 spin_unlock(&dentry
->d_lock
);
2864 /* we do have a lease on this dentry; note mds and seq */
2865 session
= ceph_get_mds_session(di
->lease_session
);
2866 seq
= di
->lease_seq
;
2867 __ceph_mdsc_drop_dentry_lease(dentry
);
2868 spin_unlock(&dentry
->d_lock
);
2870 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2871 inode
, dentry
, mask
, session
->s_mds
);
2872 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
2873 CEPH_MDS_LEASE_RELEASE
, seq
);
2874 ceph_put_mds_session(session
);
2878 * drop all leases (and dentry refs) in preparation for umount
2880 static void drop_leases(struct ceph_mds_client
*mdsc
)
2884 dout("drop_leases\n");
2885 mutex_lock(&mdsc
->mutex
);
2886 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2887 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2890 mutex_unlock(&mdsc
->mutex
);
2891 mutex_lock(&s
->s_mutex
);
2892 mutex_unlock(&s
->s_mutex
);
2893 ceph_put_mds_session(s
);
2894 mutex_lock(&mdsc
->mutex
);
2896 mutex_unlock(&mdsc
->mutex
);
2902 * delayed work -- periodically trim expired leases, renew caps with mds
2904 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
2907 unsigned hz
= round_jiffies_relative(HZ
* delay
);
2908 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
2911 static void delayed_work(struct work_struct
*work
)
2914 struct ceph_mds_client
*mdsc
=
2915 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
2919 dout("mdsc delayed_work\n");
2920 ceph_check_delayed_caps(mdsc
);
2922 mutex_lock(&mdsc
->mutex
);
2923 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
2924 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
2925 mdsc
->last_renew_caps
);
2927 mdsc
->last_renew_caps
= jiffies
;
2929 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2930 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2933 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2934 dout("resending session close request for mds%d\n",
2936 request_close_session(mdsc
, s
);
2937 ceph_put_mds_session(s
);
2940 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
2941 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
2942 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
2943 pr_info("mds%d hung\n", s
->s_mds
);
2946 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
2947 /* this mds is failed or recovering, just wait */
2948 ceph_put_mds_session(s
);
2951 mutex_unlock(&mdsc
->mutex
);
2953 mutex_lock(&s
->s_mutex
);
2955 send_renew_caps(mdsc
, s
);
2957 ceph_con_keepalive(&s
->s_con
);
2958 ceph_add_cap_releases(mdsc
, s
);
2959 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2960 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
2961 ceph_send_cap_releases(mdsc
, s
);
2962 mutex_unlock(&s
->s_mutex
);
2963 ceph_put_mds_session(s
);
2965 mutex_lock(&mdsc
->mutex
);
2967 mutex_unlock(&mdsc
->mutex
);
2969 schedule_delayed(mdsc
);
2972 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
2975 struct ceph_mds_client
*mdsc
;
2977 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
2982 mutex_init(&mdsc
->mutex
);
2983 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
2984 if (mdsc
->mdsmap
== NULL
)
2987 init_completion(&mdsc
->safe_umount_waiters
);
2988 init_waitqueue_head(&mdsc
->session_close_wq
);
2989 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
2990 mdsc
->sessions
= NULL
;
2991 mdsc
->max_sessions
= 0;
2993 init_rwsem(&mdsc
->snap_rwsem
);
2994 mdsc
->snap_realms
= RB_ROOT
;
2995 INIT_LIST_HEAD(&mdsc
->snap_empty
);
2996 spin_lock_init(&mdsc
->snap_empty_lock
);
2998 mdsc
->request_tree
= RB_ROOT
;
2999 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
3000 mdsc
->last_renew_caps
= jiffies
;
3001 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
3002 spin_lock_init(&mdsc
->cap_delay_lock
);
3003 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
3004 spin_lock_init(&mdsc
->snap_flush_lock
);
3005 mdsc
->cap_flush_seq
= 0;
3006 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
3007 INIT_LIST_HEAD(&mdsc
->cap_dirty_migrating
);
3008 mdsc
->num_cap_flushing
= 0;
3009 spin_lock_init(&mdsc
->cap_dirty_lock
);
3010 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
3011 spin_lock_init(&mdsc
->dentry_lru_lock
);
3012 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
3014 ceph_caps_init(mdsc
);
3015 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
3021 * Wait for safe replies on open mds requests. If we time out, drop
3022 * all requests from the tree to avoid dangling dentry refs.
3024 static void wait_requests(struct ceph_mds_client
*mdsc
)
3026 struct ceph_mds_request
*req
;
3027 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3029 mutex_lock(&mdsc
->mutex
);
3030 if (__get_oldest_req(mdsc
)) {
3031 mutex_unlock(&mdsc
->mutex
);
3033 dout("wait_requests waiting for requests\n");
3034 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
3035 fsc
->client
->options
->mount_timeout
* HZ
);
3037 /* tear down remaining requests */
3038 mutex_lock(&mdsc
->mutex
);
3039 while ((req
= __get_oldest_req(mdsc
))) {
3040 dout("wait_requests timed out on tid %llu\n",
3042 __unregister_request(mdsc
, req
);
3045 mutex_unlock(&mdsc
->mutex
);
3046 dout("wait_requests done\n");
3050 * called before mount is ro, and before dentries are torn down.
3051 * (hmm, does this still race with new lookups?)
3053 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
3055 dout("pre_umount\n");
3059 ceph_flush_dirty_caps(mdsc
);
3060 wait_requests(mdsc
);
3063 * wait for reply handlers to drop their request refs and
3064 * their inode/dcache refs
3070 * wait for all write mds requests to flush.
3072 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3074 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3077 mutex_lock(&mdsc
->mutex
);
3078 dout("wait_unsafe_requests want %lld\n", want_tid
);
3080 req
= __get_oldest_req(mdsc
);
3081 while (req
&& req
->r_tid
<= want_tid
) {
3082 /* find next request */
3083 n
= rb_next(&req
->r_node
);
3085 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3088 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3090 ceph_mdsc_get_request(req
);
3092 ceph_mdsc_get_request(nextreq
);
3093 mutex_unlock(&mdsc
->mutex
);
3094 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3095 req
->r_tid
, want_tid
);
3096 wait_for_completion(&req
->r_safe_completion
);
3097 mutex_lock(&mdsc
->mutex
);
3098 ceph_mdsc_put_request(req
);
3100 break; /* next dne before, so we're done! */
3101 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3102 /* next request was removed from tree */
3103 ceph_mdsc_put_request(nextreq
);
3106 ceph_mdsc_put_request(nextreq
); /* won't go away */
3110 mutex_unlock(&mdsc
->mutex
);
3111 dout("wait_unsafe_requests done\n");
3114 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3116 u64 want_tid
, want_flush
;
3118 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3122 mutex_lock(&mdsc
->mutex
);
3123 want_tid
= mdsc
->last_tid
;
3124 want_flush
= mdsc
->cap_flush_seq
;
3125 mutex_unlock(&mdsc
->mutex
);
3126 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3128 ceph_flush_dirty_caps(mdsc
);
3130 wait_unsafe_requests(mdsc
, want_tid
);
3131 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
3135 * true if all sessions are closed, or we force unmount
3137 bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3141 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3144 mutex_lock(&mdsc
->mutex
);
3145 for (i
= 0; i
< mdsc
->max_sessions
; i
++)
3146 if (mdsc
->sessions
[i
])
3148 mutex_unlock(&mdsc
->mutex
);
3153 * called after sb is ro.
3155 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3157 struct ceph_mds_session
*session
;
3159 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3160 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3162 dout("close_sessions\n");
3164 /* close sessions */
3165 mutex_lock(&mdsc
->mutex
);
3166 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3167 session
= __ceph_lookup_mds_session(mdsc
, i
);
3170 mutex_unlock(&mdsc
->mutex
);
3171 mutex_lock(&session
->s_mutex
);
3172 __close_session(mdsc
, session
);
3173 mutex_unlock(&session
->s_mutex
);
3174 ceph_put_mds_session(session
);
3175 mutex_lock(&mdsc
->mutex
);
3177 mutex_unlock(&mdsc
->mutex
);
3179 dout("waiting for sessions to close\n");
3180 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3183 /* tear down remaining sessions */
3184 mutex_lock(&mdsc
->mutex
);
3185 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3186 if (mdsc
->sessions
[i
]) {
3187 session
= get_session(mdsc
->sessions
[i
]);
3188 __unregister_session(mdsc
, session
);
3189 mutex_unlock(&mdsc
->mutex
);
3190 mutex_lock(&session
->s_mutex
);
3191 remove_session_caps(session
);
3192 mutex_unlock(&session
->s_mutex
);
3193 ceph_put_mds_session(session
);
3194 mutex_lock(&mdsc
->mutex
);
3197 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3198 mutex_unlock(&mdsc
->mutex
);
3200 ceph_cleanup_empty_realms(mdsc
);
3202 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3207 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3210 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3212 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3213 kfree(mdsc
->sessions
);
3214 ceph_caps_finalize(mdsc
);
3217 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3219 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3221 dout("mdsc_destroy %p\n", mdsc
);
3222 ceph_mdsc_stop(mdsc
);
3224 /* flush out any connection work with references to us */
3229 dout("mdsc_destroy %p done\n", mdsc
);
3234 * handle mds map update.
3236 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3240 void *p
= msg
->front
.iov_base
;
3241 void *end
= p
+ msg
->front
.iov_len
;
3242 struct ceph_mdsmap
*newmap
, *oldmap
;
3243 struct ceph_fsid fsid
;
3246 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3247 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3248 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3250 epoch
= ceph_decode_32(&p
);
3251 maplen
= ceph_decode_32(&p
);
3252 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3254 /* do we need it? */
3255 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3256 mutex_lock(&mdsc
->mutex
);
3257 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3258 dout("handle_map epoch %u <= our %u\n",
3259 epoch
, mdsc
->mdsmap
->m_epoch
);
3260 mutex_unlock(&mdsc
->mutex
);
3264 newmap
= ceph_mdsmap_decode(&p
, end
);
3265 if (IS_ERR(newmap
)) {
3266 err
= PTR_ERR(newmap
);
3270 /* swap into place */
3272 oldmap
= mdsc
->mdsmap
;
3273 mdsc
->mdsmap
= newmap
;
3274 check_new_map(mdsc
, newmap
, oldmap
);
3275 ceph_mdsmap_destroy(oldmap
);
3277 mdsc
->mdsmap
= newmap
; /* first mds map */
3279 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3281 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3283 mutex_unlock(&mdsc
->mutex
);
3284 schedule_delayed(mdsc
);
3288 mutex_unlock(&mdsc
->mutex
);
3290 pr_err("error decoding mdsmap %d\n", err
);
3294 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3296 struct ceph_mds_session
*s
= con
->private;
3298 if (get_session(s
)) {
3299 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3302 dout("mdsc con_get %p FAIL\n", s
);
3306 static void con_put(struct ceph_connection
*con
)
3308 struct ceph_mds_session
*s
= con
->private;
3310 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
) - 1);
3311 ceph_put_mds_session(s
);
3315 * if the client is unresponsive for long enough, the mds will kill
3316 * the session entirely.
3318 static void peer_reset(struct ceph_connection
*con
)
3320 struct ceph_mds_session
*s
= con
->private;
3321 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3323 pr_warning("mds%d closed our session\n", s
->s_mds
);
3324 send_mds_reconnect(mdsc
, s
);
3327 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3329 struct ceph_mds_session
*s
= con
->private;
3330 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3331 int type
= le16_to_cpu(msg
->hdr
.type
);
3333 mutex_lock(&mdsc
->mutex
);
3334 if (__verify_registered_session(mdsc
, s
) < 0) {
3335 mutex_unlock(&mdsc
->mutex
);
3338 mutex_unlock(&mdsc
->mutex
);
3341 case CEPH_MSG_MDS_MAP
:
3342 ceph_mdsc_handle_map(mdsc
, msg
);
3344 case CEPH_MSG_CLIENT_SESSION
:
3345 handle_session(s
, msg
);
3347 case CEPH_MSG_CLIENT_REPLY
:
3348 handle_reply(s
, msg
);
3350 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3351 handle_forward(mdsc
, s
, msg
);
3353 case CEPH_MSG_CLIENT_CAPS
:
3354 ceph_handle_caps(s
, msg
);
3356 case CEPH_MSG_CLIENT_SNAP
:
3357 ceph_handle_snap(mdsc
, s
, msg
);
3359 case CEPH_MSG_CLIENT_LEASE
:
3360 handle_lease(mdsc
, s
, msg
);
3364 pr_err("received unknown message type %d %s\n", type
,
3365 ceph_msg_type_name(type
));
3374 static int get_authorizer(struct ceph_connection
*con
,
3375 void **buf
, int *len
, int *proto
,
3376 void **reply_buf
, int *reply_len
, int force_new
)
3378 struct ceph_mds_session
*s
= con
->private;
3379 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3380 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3383 if (force_new
&& s
->s_authorizer
) {
3384 ac
->ops
->destroy_authorizer(ac
, s
->s_authorizer
);
3385 s
->s_authorizer
= NULL
;
3387 if (s
->s_authorizer
== NULL
) {
3388 if (ac
->ops
->create_authorizer
) {
3389 ret
= ac
->ops
->create_authorizer(
3390 ac
, CEPH_ENTITY_TYPE_MDS
,
3392 &s
->s_authorizer_buf
,
3393 &s
->s_authorizer_buf_len
,
3394 &s
->s_authorizer_reply_buf
,
3395 &s
->s_authorizer_reply_buf_len
);
3401 *proto
= ac
->protocol
;
3402 *buf
= s
->s_authorizer_buf
;
3403 *len
= s
->s_authorizer_buf_len
;
3404 *reply_buf
= s
->s_authorizer_reply_buf
;
3405 *reply_len
= s
->s_authorizer_reply_buf_len
;
3410 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3412 struct ceph_mds_session
*s
= con
->private;
3413 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3414 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3416 return ac
->ops
->verify_authorizer_reply(ac
, s
->s_authorizer
, len
);
3419 static int invalidate_authorizer(struct ceph_connection
*con
)
3421 struct ceph_mds_session
*s
= con
->private;
3422 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3423 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3425 if (ac
->ops
->invalidate_authorizer
)
3426 ac
->ops
->invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3428 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3431 static const struct ceph_connection_operations mds_con_ops
= {
3434 .dispatch
= dispatch
,
3435 .get_authorizer
= get_authorizer
,
3436 .verify_authorizer_reply
= verify_authorizer_reply
,
3437 .invalidate_authorizer
= invalidate_authorizer
,
3438 .peer_reset
= peer_reset
,