1 #include "ceph_debug.h"
3 #include <linux/wait.h>
4 #include <linux/sched.h>
6 #include "mds_client.h"
7 #include "mon_client.h"
15 * A cluster of MDS (metadata server) daemons is responsible for
16 * managing the file system namespace (the directory hierarchy and
17 * inodes) and for coordinating shared access to storage. Metadata is
18 * partitioning hierarchically across a number of servers, and that
19 * partition varies over time as the cluster adjusts the distribution
20 * in order to balance load.
22 * The MDS client is primarily responsible to managing synchronous
23 * metadata requests for operations like open, unlink, and so forth.
24 * If there is a MDS failure, we find out about it when we (possibly
25 * request and) receive a new MDS map, and can resubmit affected
28 * For the most part, though, we take advantage of a lossless
29 * communications channel to the MDS, and do not need to worry about
30 * timing out or resubmitting requests.
32 * We maintain a stateful "session" with each MDS we interact with.
33 * Within each session, we sent periodic heartbeat messages to ensure
34 * any capabilities or leases we have been issues remain valid. If
35 * the session times out and goes stale, our leases and capabilities
36 * are no longer valid.
39 static void __wake_requests(struct ceph_mds_client
*mdsc
,
40 struct list_head
*head
);
42 const static struct ceph_connection_operations mds_con_ops
;
50 * parse individual inode info
52 static int parse_reply_info_in(void **p
, void *end
,
53 struct ceph_mds_reply_info_in
*info
)
58 *p
+= sizeof(struct ceph_mds_reply_inode
) +
59 sizeof(*info
->in
->fragtree
.splits
) *
60 le32_to_cpu(info
->in
->fragtree
.nsplits
);
62 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
63 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
65 *p
+= info
->symlink_len
;
67 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
68 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
69 info
->xattr_data
= *p
;
70 *p
+= info
->xattr_len
;
77 * parse a normal reply, which may contain a (dir+)dentry and/or a
80 static int parse_reply_info_trace(void **p
, void *end
,
81 struct ceph_mds_reply_info_parsed
*info
)
85 if (info
->head
->is_dentry
) {
86 err
= parse_reply_info_in(p
, end
, &info
->diri
);
90 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
93 *p
+= sizeof(*info
->dirfrag
) +
94 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
95 if (unlikely(*p
> end
))
98 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
99 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
101 *p
+= info
->dname_len
;
103 *p
+= sizeof(*info
->dlease
);
106 if (info
->head
->is_target
) {
107 err
= parse_reply_info_in(p
, end
, &info
->targeti
);
112 if (unlikely(*p
!= end
))
119 pr_err("problem parsing mds trace %d\n", err
);
124 * parse readdir results
126 static int parse_reply_info_dir(void **p
, void *end
,
127 struct ceph_mds_reply_info_parsed
*info
)
133 if (*p
+ sizeof(*info
->dir_dir
) > end
)
135 *p
+= sizeof(*info
->dir_dir
) +
136 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
140 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
141 num
= ceph_decode_32(p
);
142 info
->dir_end
= ceph_decode_8(p
);
143 info
->dir_complete
= ceph_decode_8(p
);
147 /* alloc large array */
149 info
->dir_in
= kcalloc(num
, sizeof(*info
->dir_in
) +
150 sizeof(*info
->dir_dname
) +
151 sizeof(*info
->dir_dname_len
) +
152 sizeof(*info
->dir_dlease
),
154 if (info
->dir_in
== NULL
) {
158 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
159 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
160 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
164 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
165 info
->dir_dname_len
[i
] = ceph_decode_32(p
);
166 ceph_decode_need(p
, end
, info
->dir_dname_len
[i
], bad
);
167 info
->dir_dname
[i
] = *p
;
168 *p
+= info
->dir_dname_len
[i
];
169 dout("parsed dir dname '%.*s'\n", info
->dir_dname_len
[i
],
171 info
->dir_dlease
[i
] = *p
;
172 *p
+= sizeof(struct ceph_mds_reply_lease
);
175 err
= parse_reply_info_in(p
, end
, &info
->dir_in
[i
]);
190 pr_err("problem parsing dir contents %d\n", err
);
195 * parse entire mds reply
197 static int parse_reply_info(struct ceph_msg
*msg
,
198 struct ceph_mds_reply_info_parsed
*info
)
204 info
->head
= msg
->front
.iov_base
;
205 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
206 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
209 ceph_decode_32_safe(&p
, end
, len
, bad
);
211 err
= parse_reply_info_trace(&p
, p
+len
, info
);
217 ceph_decode_32_safe(&p
, end
, len
, bad
);
219 err
= parse_reply_info_dir(&p
, p
+len
, info
);
225 ceph_decode_32_safe(&p
, end
, len
, bad
);
226 info
->snapblob_len
= len
;
237 pr_err("mds parse_reply err %d\n", err
);
241 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
250 static const char *session_state_name(int s
)
253 case CEPH_MDS_SESSION_NEW
: return "new";
254 case CEPH_MDS_SESSION_OPENING
: return "opening";
255 case CEPH_MDS_SESSION_OPEN
: return "open";
256 case CEPH_MDS_SESSION_HUNG
: return "hung";
257 case CEPH_MDS_SESSION_CLOSING
: return "closing";
258 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
259 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
260 default: return "???";
264 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
266 if (atomic_inc_not_zero(&s
->s_ref
)) {
267 dout("mdsc get_session %p %d -> %d\n", s
,
268 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
271 dout("mdsc get_session %p 0 -- FAIL", s
);
276 void ceph_put_mds_session(struct ceph_mds_session
*s
)
278 dout("mdsc put_session %p %d -> %d\n", s
,
279 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
280 if (atomic_dec_and_test(&s
->s_ref
)) {
282 s
->s_mdsc
->client
->monc
.auth
->ops
->destroy_authorizer(
283 s
->s_mdsc
->client
->monc
.auth
, s
->s_authorizer
);
289 * called under mdsc->mutex
291 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
294 struct ceph_mds_session
*session
;
296 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
298 session
= mdsc
->sessions
[mds
];
299 dout("lookup_mds_session %p %d\n", session
,
300 atomic_read(&session
->s_ref
));
301 get_session(session
);
305 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
307 if (mds
>= mdsc
->max_sessions
)
309 return mdsc
->sessions
[mds
];
312 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
313 struct ceph_mds_session
*s
)
315 if (s
->s_mds
>= mdsc
->max_sessions
||
316 mdsc
->sessions
[s
->s_mds
] != s
)
322 * create+register a new session for given mds.
323 * called under mdsc->mutex.
325 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
328 struct ceph_mds_session
*s
;
330 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
332 return ERR_PTR(-ENOMEM
);
335 s
->s_state
= CEPH_MDS_SESSION_NEW
;
338 mutex_init(&s
->s_mutex
);
340 ceph_con_init(mdsc
->client
->msgr
, &s
->s_con
);
341 s
->s_con
.private = s
;
342 s
->s_con
.ops
= &mds_con_ops
;
343 s
->s_con
.peer_name
.type
= CEPH_ENTITY_TYPE_MDS
;
344 s
->s_con
.peer_name
.num
= cpu_to_le64(mds
);
346 spin_lock_init(&s
->s_cap_lock
);
349 s
->s_renew_requested
= 0;
351 INIT_LIST_HEAD(&s
->s_caps
);
354 atomic_set(&s
->s_ref
, 1);
355 INIT_LIST_HEAD(&s
->s_waiting
);
356 INIT_LIST_HEAD(&s
->s_unsafe
);
357 s
->s_num_cap_releases
= 0;
358 s
->s_cap_iterator
= NULL
;
359 INIT_LIST_HEAD(&s
->s_cap_releases
);
360 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
361 INIT_LIST_HEAD(&s
->s_cap_flushing
);
362 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
364 dout("register_session mds%d\n", mds
);
365 if (mds
>= mdsc
->max_sessions
) {
366 int newmax
= 1 << get_count_order(mds
+1);
367 struct ceph_mds_session
**sa
;
369 dout("register_session realloc to %d\n", newmax
);
370 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
373 if (mdsc
->sessions
) {
374 memcpy(sa
, mdsc
->sessions
,
375 mdsc
->max_sessions
* sizeof(void *));
376 kfree(mdsc
->sessions
);
379 mdsc
->max_sessions
= newmax
;
381 mdsc
->sessions
[mds
] = s
;
382 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
384 ceph_con_open(&s
->s_con
, ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
390 return ERR_PTR(-ENOMEM
);
394 * called under mdsc->mutex
396 static void __unregister_session(struct ceph_mds_client
*mdsc
,
397 struct ceph_mds_session
*s
)
399 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
400 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
401 mdsc
->sessions
[s
->s_mds
] = NULL
;
402 ceph_con_close(&s
->s_con
);
403 ceph_put_mds_session(s
);
407 * drop session refs in request.
409 * should be last request ref, or hold mdsc->mutex
411 static void put_request_session(struct ceph_mds_request
*req
)
413 if (req
->r_session
) {
414 ceph_put_mds_session(req
->r_session
);
415 req
->r_session
= NULL
;
419 void ceph_mdsc_release_request(struct kref
*kref
)
421 struct ceph_mds_request
*req
= container_of(kref
,
422 struct ceph_mds_request
,
425 ceph_msg_put(req
->r_request
);
427 ceph_msg_put(req
->r_reply
);
428 destroy_reply_info(&req
->r_reply_info
);
431 ceph_put_cap_refs(ceph_inode(req
->r_inode
),
435 if (req
->r_locked_dir
)
436 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
),
438 if (req
->r_target_inode
)
439 iput(req
->r_target_inode
);
442 if (req
->r_old_dentry
) {
444 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
446 dput(req
->r_old_dentry
);
450 put_request_session(req
);
451 ceph_unreserve_caps(&req
->r_caps_reservation
);
456 * lookup session, bump ref if found.
458 * called under mdsc->mutex.
460 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
463 struct ceph_mds_request
*req
;
464 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
467 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
468 if (tid
< req
->r_tid
)
470 else if (tid
> req
->r_tid
)
473 ceph_mdsc_get_request(req
);
480 static void __insert_request(struct ceph_mds_client
*mdsc
,
481 struct ceph_mds_request
*new)
483 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
484 struct rb_node
*parent
= NULL
;
485 struct ceph_mds_request
*req
= NULL
;
489 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
490 if (new->r_tid
< req
->r_tid
)
492 else if (new->r_tid
> req
->r_tid
)
498 rb_link_node(&new->r_node
, parent
, p
);
499 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
503 * Register an in-flight request, and assign a tid. Link to directory
504 * are modifying (if any).
506 * Called under mdsc->mutex.
508 static void __register_request(struct ceph_mds_client
*mdsc
,
509 struct ceph_mds_request
*req
,
512 req
->r_tid
= ++mdsc
->last_tid
;
514 ceph_reserve_caps(&req
->r_caps_reservation
, req
->r_num_caps
);
515 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
516 ceph_mdsc_get_request(req
);
517 __insert_request(mdsc
, req
);
520 struct ceph_inode_info
*ci
= ceph_inode(dir
);
522 spin_lock(&ci
->i_unsafe_lock
);
523 req
->r_unsafe_dir
= dir
;
524 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
525 spin_unlock(&ci
->i_unsafe_lock
);
529 static void __unregister_request(struct ceph_mds_client
*mdsc
,
530 struct ceph_mds_request
*req
)
532 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
533 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
534 RB_CLEAR_NODE(&req
->r_node
);
535 ceph_mdsc_put_request(req
);
537 if (req
->r_unsafe_dir
) {
538 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
540 spin_lock(&ci
->i_unsafe_lock
);
541 list_del_init(&req
->r_unsafe_dir_item
);
542 spin_unlock(&ci
->i_unsafe_lock
);
547 * Choose mds to send request to next. If there is a hint set in the
548 * request (e.g., due to a prior forward hint from the mds), use that.
549 * Otherwise, consult frag tree and/or caps to identify the
550 * appropriate mds. If all else fails, choose randomly.
552 * Called under mdsc->mutex.
554 static int __choose_mds(struct ceph_mds_client
*mdsc
,
555 struct ceph_mds_request
*req
)
558 struct ceph_inode_info
*ci
;
559 struct ceph_cap
*cap
;
560 int mode
= req
->r_direct_mode
;
562 u32 hash
= req
->r_direct_hash
;
563 bool is_hash
= req
->r_direct_is_hash
;
566 * is there a specific mds we should try? ignore hint if we have
567 * no session and the mds is not up (active or recovering).
569 if (req
->r_resend_mds
>= 0 &&
570 (__have_session(mdsc
, req
->r_resend_mds
) ||
571 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
572 dout("choose_mds using resend_mds mds%d\n",
574 return req
->r_resend_mds
;
577 if (mode
== USE_RANDOM_MDS
)
582 inode
= req
->r_inode
;
583 } else if (req
->r_dentry
) {
584 if (req
->r_dentry
->d_inode
) {
585 inode
= req
->r_dentry
->d_inode
;
587 inode
= req
->r_dentry
->d_parent
->d_inode
;
588 hash
= req
->r_dentry
->d_name
.hash
;
592 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
596 ci
= ceph_inode(inode
);
598 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
599 struct ceph_inode_frag frag
;
602 ceph_choose_frag(ci
, hash
, &frag
, &found
);
604 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
607 /* choose a random replica */
608 get_random_bytes(&r
, 1);
611 dout("choose_mds %p %llx.%llx "
612 "frag %u mds%d (%d/%d)\n",
613 inode
, ceph_vinop(inode
),
619 /* since this file/dir wasn't known to be
620 * replicated, then we want to look for the
621 * authoritative mds. */
624 /* choose auth mds */
626 dout("choose_mds %p %llx.%llx "
627 "frag %u mds%d (auth)\n",
628 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
634 spin_lock(&inode
->i_lock
);
636 if (mode
== USE_AUTH_MDS
)
637 cap
= ci
->i_auth_cap
;
638 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
639 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
641 spin_unlock(&inode
->i_lock
);
644 mds
= cap
->session
->s_mds
;
645 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
646 inode
, ceph_vinop(inode
), mds
,
647 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
648 spin_unlock(&inode
->i_lock
);
652 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
653 dout("choose_mds chose random mds%d\n", mds
);
661 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
663 struct ceph_msg
*msg
;
664 struct ceph_mds_session_head
*h
;
666 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), 0, 0, NULL
);
668 pr_err("create_session_msg ENOMEM creating msg\n");
669 return ERR_PTR(PTR_ERR(msg
));
671 h
= msg
->front
.iov_base
;
672 h
->op
= cpu_to_le32(op
);
673 h
->seq
= cpu_to_le64(seq
);
678 * send session open request.
680 * called under mdsc->mutex
682 static int __open_session(struct ceph_mds_client
*mdsc
,
683 struct ceph_mds_session
*session
)
685 struct ceph_msg
*msg
;
687 int mds
= session
->s_mds
;
690 /* wait for mds to go active? */
691 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
692 dout("open_session to mds%d (%s)\n", mds
,
693 ceph_mds_state_name(mstate
));
694 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
695 session
->s_renew_requested
= jiffies
;
697 /* send connect message */
698 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
703 ceph_con_send(&session
->s_con
, msg
);
714 * Free preallocated cap messages assigned to this session
716 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
718 struct ceph_msg
*msg
;
720 spin_lock(&session
->s_cap_lock
);
721 while (!list_empty(&session
->s_cap_releases
)) {
722 msg
= list_first_entry(&session
->s_cap_releases
,
723 struct ceph_msg
, list_head
);
724 list_del_init(&msg
->list_head
);
727 while (!list_empty(&session
->s_cap_releases_done
)) {
728 msg
= list_first_entry(&session
->s_cap_releases_done
,
729 struct ceph_msg
, list_head
);
730 list_del_init(&msg
->list_head
);
733 spin_unlock(&session
->s_cap_lock
);
737 * Helper to safely iterate over all caps associated with a session.
739 * caller must hold session s_mutex
741 static int iterate_session_caps(struct ceph_mds_session
*session
,
742 int (*cb
)(struct inode
*, struct ceph_cap
*,
746 struct ceph_cap
*cap
;
747 struct inode
*inode
, *last_inode
= NULL
;
748 struct ceph_cap
*old_cap
= NULL
;
751 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
752 spin_lock(&session
->s_cap_lock
);
753 p
= session
->s_caps
.next
;
754 while (p
!= &session
->s_caps
) {
755 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
756 inode
= igrab(&cap
->ci
->vfs_inode
);
761 session
->s_cap_iterator
= cap
;
762 spin_unlock(&session
->s_cap_lock
);
769 ceph_put_cap(old_cap
);
773 ret
= cb(inode
, cap
, arg
);
776 spin_lock(&session
->s_cap_lock
);
778 if (cap
->ci
== NULL
) {
779 dout("iterate_session_caps finishing cap %p removal\n",
781 BUG_ON(cap
->session
!= session
);
782 list_del_init(&cap
->session_caps
);
783 session
->s_nr_caps
--;
785 old_cap
= cap
; /* put_cap it w/o locks held */
792 session
->s_cap_iterator
= NULL
;
793 spin_unlock(&session
->s_cap_lock
);
798 ceph_put_cap(old_cap
);
803 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
806 struct ceph_inode_info
*ci
= ceph_inode(inode
);
807 dout("removing cap %p, ci is %p, inode is %p\n",
808 cap
, ci
, &ci
->vfs_inode
);
809 ceph_remove_cap(cap
);
814 * caller must hold session s_mutex
816 static void remove_session_caps(struct ceph_mds_session
*session
)
818 dout("remove_session_caps on %p\n", session
);
819 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
820 BUG_ON(session
->s_nr_caps
> 0);
821 cleanup_cap_releases(session
);
825 * wake up any threads waiting on this session's caps. if the cap is
826 * old (didn't get renewed on the client reconnect), remove it now.
828 * caller must hold s_mutex.
830 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
833 struct ceph_inode_info
*ci
= ceph_inode(inode
);
835 wake_up(&ci
->i_cap_wq
);
837 spin_lock(&inode
->i_lock
);
838 ci
->i_wanted_max_size
= 0;
839 ci
->i_requested_max_size
= 0;
840 spin_unlock(&inode
->i_lock
);
845 static void wake_up_session_caps(struct ceph_mds_session
*session
,
848 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
849 iterate_session_caps(session
, wake_up_session_cb
,
850 (void *)(unsigned long)reconnect
);
854 * Send periodic message to MDS renewing all currently held caps. The
855 * ack will reset the expiration for all caps from this session.
857 * caller holds s_mutex
859 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
860 struct ceph_mds_session
*session
)
862 struct ceph_msg
*msg
;
865 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
866 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
867 pr_info("mds%d caps stale\n", session
->s_mds
);
868 session
->s_renew_requested
= jiffies
;
870 /* do not try to renew caps until a recovering mds has reconnected
871 * with its clients. */
872 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
873 if (state
< CEPH_MDS_STATE_RECONNECT
) {
874 dout("send_renew_caps ignoring mds%d (%s)\n",
875 session
->s_mds
, ceph_mds_state_name(state
));
879 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
880 ceph_mds_state_name(state
));
881 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
882 ++session
->s_renew_seq
);
885 ceph_con_send(&session
->s_con
, msg
);
890 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
892 * Called under session->s_mutex
894 static void renewed_caps(struct ceph_mds_client
*mdsc
,
895 struct ceph_mds_session
*session
, int is_renew
)
900 spin_lock(&session
->s_cap_lock
);
901 was_stale
= is_renew
&& (session
->s_cap_ttl
== 0 ||
902 time_after_eq(jiffies
, session
->s_cap_ttl
));
904 session
->s_cap_ttl
= session
->s_renew_requested
+
905 mdsc
->mdsmap
->m_session_timeout
*HZ
;
908 if (time_before(jiffies
, session
->s_cap_ttl
)) {
909 pr_info("mds%d caps renewed\n", session
->s_mds
);
912 pr_info("mds%d caps still stale\n", session
->s_mds
);
915 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
916 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
917 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
918 spin_unlock(&session
->s_cap_lock
);
921 wake_up_session_caps(session
, 0);
925 * send a session close request
927 static int request_close_session(struct ceph_mds_client
*mdsc
,
928 struct ceph_mds_session
*session
)
930 struct ceph_msg
*msg
;
933 dout("request_close_session mds%d state %s seq %lld\n",
934 session
->s_mds
, session_state_name(session
->s_state
),
936 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
940 ceph_con_send(&session
->s_con
, msg
);
945 * Called with s_mutex held.
947 static int __close_session(struct ceph_mds_client
*mdsc
,
948 struct ceph_mds_session
*session
)
950 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
952 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
953 return request_close_session(mdsc
, session
);
959 * Because we can't cache an inode without one or more caps, we do
960 * this indirectly: if a cap is unused, we prune its aliases, at which
961 * point the inode will hopefully get dropped to.
963 * Yes, this is a bit sloppy. Our only real goal here is to respond to
964 * memory pressure from the MDS, though, so it needn't be perfect.
966 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
968 struct ceph_mds_session
*session
= arg
;
969 struct ceph_inode_info
*ci
= ceph_inode(inode
);
970 int used
, oissued
, mine
;
972 if (session
->s_trim_caps
<= 0)
975 spin_lock(&inode
->i_lock
);
976 mine
= cap
->issued
| cap
->implemented
;
977 used
= __ceph_caps_used(ci
);
978 oissued
= __ceph_caps_issued_other(ci
, cap
);
980 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s\n",
981 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
982 ceph_cap_string(used
));
983 if (ci
->i_dirty_caps
)
984 goto out
; /* dirty caps */
985 if ((used
& ~oissued
) & mine
)
986 goto out
; /* we need these caps */
988 session
->s_trim_caps
--;
990 /* we aren't the only cap.. just remove us */
991 __ceph_remove_cap(cap
);
993 /* try to drop referring dentries */
994 spin_unlock(&inode
->i_lock
);
995 d_prune_aliases(inode
);
996 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
997 inode
, cap
, atomic_read(&inode
->i_count
));
1002 spin_unlock(&inode
->i_lock
);
1007 * Trim session cap count down to some max number.
1009 static int trim_caps(struct ceph_mds_client
*mdsc
,
1010 struct ceph_mds_session
*session
,
1013 int trim_caps
= session
->s_nr_caps
- max_caps
;
1015 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1016 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1017 if (trim_caps
> 0) {
1018 session
->s_trim_caps
= trim_caps
;
1019 iterate_session_caps(session
, trim_caps_cb
, session
);
1020 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1021 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1022 trim_caps
- session
->s_trim_caps
);
1023 session
->s_trim_caps
= 0;
1029 * Allocate cap_release messages. If there is a partially full message
1030 * in the queue, try to allocate enough to cover it's remainder, so that
1031 * we can send it immediately.
1033 * Called under s_mutex.
1035 static int add_cap_releases(struct ceph_mds_client
*mdsc
,
1036 struct ceph_mds_session
*session
,
1039 struct ceph_msg
*msg
;
1040 struct ceph_mds_cap_release
*head
;
1044 extra
= mdsc
->client
->mount_args
->cap_release_safety
;
1046 spin_lock(&session
->s_cap_lock
);
1048 if (!list_empty(&session
->s_cap_releases
)) {
1049 msg
= list_first_entry(&session
->s_cap_releases
,
1052 head
= msg
->front
.iov_base
;
1053 extra
+= CEPH_CAPS_PER_RELEASE
- le32_to_cpu(head
->num
);
1056 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1057 spin_unlock(&session
->s_cap_lock
);
1058 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1062 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1063 (int)msg
->front
.iov_len
);
1064 head
= msg
->front
.iov_base
;
1065 head
->num
= cpu_to_le32(0);
1066 msg
->front
.iov_len
= sizeof(*head
);
1067 spin_lock(&session
->s_cap_lock
);
1068 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1069 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1072 if (!list_empty(&session
->s_cap_releases
)) {
1073 msg
= list_first_entry(&session
->s_cap_releases
,
1076 head
= msg
->front
.iov_base
;
1078 dout(" queueing non-full %p (%d)\n", msg
,
1079 le32_to_cpu(head
->num
));
1080 list_move_tail(&msg
->list_head
,
1081 &session
->s_cap_releases_done
);
1082 session
->s_num_cap_releases
-=
1083 CEPH_CAPS_PER_RELEASE
- le32_to_cpu(head
->num
);
1087 spin_unlock(&session
->s_cap_lock
);
1093 * flush all dirty inode data to disk.
1095 * returns true if we've flushed through want_flush_seq
1097 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1101 dout("check_cap_flush want %lld\n", want_flush_seq
);
1102 mutex_lock(&mdsc
->mutex
);
1103 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1104 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1108 get_session(session
);
1109 mutex_unlock(&mdsc
->mutex
);
1111 mutex_lock(&session
->s_mutex
);
1112 if (!list_empty(&session
->s_cap_flushing
)) {
1113 struct ceph_inode_info
*ci
=
1114 list_entry(session
->s_cap_flushing
.next
,
1115 struct ceph_inode_info
,
1117 struct inode
*inode
= &ci
->vfs_inode
;
1119 spin_lock(&inode
->i_lock
);
1120 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1121 dout("check_cap_flush still flushing %p "
1122 "seq %lld <= %lld to mds%d\n", inode
,
1123 ci
->i_cap_flush_seq
, want_flush_seq
,
1127 spin_unlock(&inode
->i_lock
);
1129 mutex_unlock(&session
->s_mutex
);
1130 ceph_put_mds_session(session
);
1134 mutex_lock(&mdsc
->mutex
);
1137 mutex_unlock(&mdsc
->mutex
);
1138 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1143 * called under s_mutex
1145 static void send_cap_releases(struct ceph_mds_client
*mdsc
,
1146 struct ceph_mds_session
*session
)
1148 struct ceph_msg
*msg
;
1150 dout("send_cap_releases mds%d\n", session
->s_mds
);
1152 spin_lock(&session
->s_cap_lock
);
1153 if (list_empty(&session
->s_cap_releases_done
))
1155 msg
= list_first_entry(&session
->s_cap_releases_done
,
1156 struct ceph_msg
, list_head
);
1157 list_del_init(&msg
->list_head
);
1158 spin_unlock(&session
->s_cap_lock
);
1159 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1160 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1161 ceph_con_send(&session
->s_con
, msg
);
1163 spin_unlock(&session
->s_cap_lock
);
1171 * Create an mds request.
1173 struct ceph_mds_request
*
1174 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1176 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1179 return ERR_PTR(-ENOMEM
);
1181 req
->r_started
= jiffies
;
1182 req
->r_resend_mds
= -1;
1183 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1185 kref_init(&req
->r_kref
);
1186 INIT_LIST_HEAD(&req
->r_wait
);
1187 init_completion(&req
->r_completion
);
1188 init_completion(&req
->r_safe_completion
);
1189 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1192 req
->r_direct_mode
= mode
;
1197 * return oldest (lowest) request, tid in request tree, 0 if none.
1199 * called under mdsc->mutex.
1201 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1203 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1205 return rb_entry(rb_first(&mdsc
->request_tree
),
1206 struct ceph_mds_request
, r_node
);
1209 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1211 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1219 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1220 * on build_path_from_dentry in fs/cifs/dir.c.
1222 * If @stop_on_nosnap, generate path relative to the first non-snapped
1225 * Encode hidden .snap dirs as a double /, i.e.
1226 * foo/.snap/bar -> foo//bar
1228 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1231 struct dentry
*temp
;
1236 return ERR_PTR(-EINVAL
);
1240 for (temp
= dentry
; !IS_ROOT(temp
);) {
1241 struct inode
*inode
= temp
->d_inode
;
1242 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1243 len
++; /* slash only */
1244 else if (stop_on_nosnap
&& inode
&&
1245 ceph_snap(inode
) == CEPH_NOSNAP
)
1248 len
+= 1 + temp
->d_name
.len
;
1249 temp
= temp
->d_parent
;
1251 pr_err("build_path_dentry corrupt dentry %p\n", dentry
);
1252 return ERR_PTR(-EINVAL
);
1256 len
--; /* no leading '/' */
1258 path
= kmalloc(len
+1, GFP_NOFS
);
1260 return ERR_PTR(-ENOMEM
);
1262 path
[pos
] = 0; /* trailing null */
1263 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1264 struct inode
*inode
= temp
->d_inode
;
1266 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1267 dout("build_path_dentry path+%d: %p SNAPDIR\n",
1269 } else if (stop_on_nosnap
&& inode
&&
1270 ceph_snap(inode
) == CEPH_NOSNAP
) {
1273 pos
-= temp
->d_name
.len
;
1276 strncpy(path
+ pos
, temp
->d_name
.name
,
1278 dout("build_path_dentry path+%d: %p '%.*s'\n",
1279 pos
, temp
, temp
->d_name
.len
, path
+ pos
);
1283 temp
= temp
->d_parent
;
1285 pr_err("build_path_dentry corrupt dentry\n");
1287 return ERR_PTR(-EINVAL
);
1291 pr_err("build_path_dentry did not end path lookup where "
1292 "expected, namelen is %d, pos is %d\n", len
, pos
);
1293 /* presumably this is only possible if racing with a
1294 rename of one of the parent directories (we can not
1295 lock the dentries above us to prevent this, but
1296 retrying should be harmless) */
1301 *base
= ceph_ino(temp
->d_inode
);
1303 dout("build_path_dentry on %p %d built %llx '%.*s'\n",
1304 dentry
, atomic_read(&dentry
->d_count
), *base
, len
, path
);
1308 static int build_dentry_path(struct dentry
*dentry
,
1309 const char **ppath
, int *ppathlen
, u64
*pino
,
1314 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1315 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1316 *ppath
= dentry
->d_name
.name
;
1317 *ppathlen
= dentry
->d_name
.len
;
1320 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1322 return PTR_ERR(path
);
1328 static int build_inode_path(struct inode
*inode
,
1329 const char **ppath
, int *ppathlen
, u64
*pino
,
1332 struct dentry
*dentry
;
1335 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1336 *pino
= ceph_ino(inode
);
1340 dentry
= d_find_alias(inode
);
1341 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1344 return PTR_ERR(path
);
1351 * request arguments may be specified via an inode *, a dentry *, or
1352 * an explicit ino+path.
1354 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1355 const char *rpath
, u64 rino
,
1356 const char **ppath
, int *pathlen
,
1357 u64
*ino
, int *freepath
)
1362 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1363 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1365 } else if (rdentry
) {
1366 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1367 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1372 *pathlen
= strlen(rpath
);
1373 dout(" path %.*s\n", *pathlen
, rpath
);
1380 * called under mdsc->mutex
1382 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1383 struct ceph_mds_request
*req
,
1386 struct ceph_msg
*msg
;
1387 struct ceph_mds_request_head
*head
;
1388 const char *path1
= NULL
;
1389 const char *path2
= NULL
;
1390 u64 ino1
= 0, ino2
= 0;
1391 int pathlen1
= 0, pathlen2
= 0;
1392 int freepath1
= 0, freepath2
= 0;
1398 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1399 req
->r_path1
, req
->r_ino1
.ino
,
1400 &path1
, &pathlen1
, &ino1
, &freepath1
);
1406 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1407 req
->r_path2
, req
->r_ino2
.ino
,
1408 &path2
, &pathlen2
, &ino2
, &freepath2
);
1414 len
= sizeof(*head
) +
1415 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1417 /* calculate (max) length for cap releases */
1418 len
+= sizeof(struct ceph_mds_request_release
) *
1419 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1420 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1421 if (req
->r_dentry_drop
)
1422 len
+= req
->r_dentry
->d_name
.len
;
1423 if (req
->r_old_dentry_drop
)
1424 len
+= req
->r_old_dentry
->d_name
.len
;
1426 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, 0, 0, NULL
);
1430 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1432 head
= msg
->front
.iov_base
;
1433 p
= msg
->front
.iov_base
+ sizeof(*head
);
1434 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1436 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1437 head
->op
= cpu_to_le32(req
->r_op
);
1438 head
->caller_uid
= cpu_to_le32(current_fsuid());
1439 head
->caller_gid
= cpu_to_le32(current_fsgid());
1440 head
->args
= req
->r_args
;
1442 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1443 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1447 if (req
->r_inode_drop
)
1448 releases
+= ceph_encode_inode_release(&p
,
1449 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1450 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1451 if (req
->r_dentry_drop
)
1452 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1453 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1454 if (req
->r_old_dentry_drop
)
1455 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1456 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1457 if (req
->r_old_inode_drop
)
1458 releases
+= ceph_encode_inode_release(&p
,
1459 req
->r_old_dentry
->d_inode
,
1460 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1461 head
->num_releases
= cpu_to_le16(releases
);
1464 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1465 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1467 msg
->pages
= req
->r_pages
;
1468 msg
->nr_pages
= req
->r_num_pages
;
1469 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1470 msg
->hdr
.data_off
= cpu_to_le16(0);
1474 kfree((char *)path2
);
1477 kfree((char *)path1
);
1483 * called under mdsc->mutex if error, under no mutex if
1486 static void complete_request(struct ceph_mds_client
*mdsc
,
1487 struct ceph_mds_request
*req
)
1489 if (req
->r_callback
)
1490 req
->r_callback(mdsc
, req
);
1492 complete(&req
->r_completion
);
1496 * called under mdsc->mutex
1498 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1499 struct ceph_mds_request
*req
,
1502 struct ceph_mds_request_head
*rhead
;
1503 struct ceph_msg
*msg
;
1508 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1509 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1511 if (req
->r_request
) {
1512 ceph_msg_put(req
->r_request
);
1513 req
->r_request
= NULL
;
1515 msg
= create_request_message(mdsc
, req
, mds
);
1517 req
->r_reply
= ERR_PTR(PTR_ERR(msg
));
1518 complete_request(mdsc
, req
);
1519 return -PTR_ERR(msg
);
1521 req
->r_request
= msg
;
1523 rhead
= msg
->front
.iov_base
;
1524 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1525 if (req
->r_got_unsafe
)
1526 flags
|= CEPH_MDS_FLAG_REPLAY
;
1527 if (req
->r_locked_dir
)
1528 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1529 rhead
->flags
= cpu_to_le32(flags
);
1530 rhead
->num_fwd
= req
->r_num_fwd
;
1531 rhead
->num_retry
= req
->r_attempts
- 1;
1533 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1535 if (req
->r_target_inode
&& req
->r_got_unsafe
)
1536 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1543 * send request, or put it on the appropriate wait list.
1545 static int __do_request(struct ceph_mds_client
*mdsc
,
1546 struct ceph_mds_request
*req
)
1548 struct ceph_mds_session
*session
= NULL
;
1555 if (req
->r_timeout
&&
1556 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1557 dout("do_request timed out\n");
1562 mds
= __choose_mds(mdsc
, req
);
1564 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1565 dout("do_request no mds or not active, waiting for map\n");
1566 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1570 /* get, open session */
1571 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1573 session
= register_session(mdsc
, mds
);
1574 if (IS_ERR(session
)) {
1575 err
= PTR_ERR(session
);
1579 dout("do_request mds%d session %p state %s\n", mds
, session
,
1580 session_state_name(session
->s_state
));
1581 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1582 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
1583 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
1584 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
1585 __open_session(mdsc
, session
);
1586 list_add(&req
->r_wait
, &session
->s_waiting
);
1591 req
->r_session
= get_session(session
);
1592 req
->r_resend_mds
= -1; /* forget any previous mds hint */
1594 if (req
->r_request_started
== 0) /* note request start time */
1595 req
->r_request_started
= jiffies
;
1597 err
= __prepare_send_request(mdsc
, req
, mds
);
1599 ceph_msg_get(req
->r_request
);
1600 ceph_con_send(&session
->s_con
, req
->r_request
);
1604 ceph_put_mds_session(session
);
1609 req
->r_reply
= ERR_PTR(err
);
1610 complete_request(mdsc
, req
);
1615 * called under mdsc->mutex
1617 static void __wake_requests(struct ceph_mds_client
*mdsc
,
1618 struct list_head
*head
)
1620 struct ceph_mds_request
*req
, *nreq
;
1622 list_for_each_entry_safe(req
, nreq
, head
, r_wait
) {
1623 list_del_init(&req
->r_wait
);
1624 __do_request(mdsc
, req
);
1629 * Wake up threads with requests pending for @mds, so that they can
1630 * resubmit their requests to a possibly different mds. If @all is set,
1631 * wake up if their requests has been forwarded to @mds, too.
1633 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
, int all
)
1635 struct ceph_mds_request
*req
;
1638 dout("kick_requests mds%d\n", mds
);
1639 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
1640 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1641 if (req
->r_got_unsafe
)
1643 if (req
->r_session
&&
1644 req
->r_session
->s_mds
== mds
) {
1645 dout(" kicking tid %llu\n", req
->r_tid
);
1646 put_request_session(req
);
1647 __do_request(mdsc
, req
);
1652 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
1653 struct ceph_mds_request
*req
)
1655 dout("submit_request on %p\n", req
);
1656 mutex_lock(&mdsc
->mutex
);
1657 __register_request(mdsc
, req
, NULL
);
1658 __do_request(mdsc
, req
);
1659 mutex_unlock(&mdsc
->mutex
);
1663 * Synchrously perform an mds request. Take care of all of the
1664 * session setup, forwarding, retry details.
1666 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
1668 struct ceph_mds_request
*req
)
1672 dout("do_request on %p\n", req
);
1674 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
1676 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
1677 if (req
->r_locked_dir
)
1678 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
1679 if (req
->r_old_dentry
)
1681 ceph_inode(req
->r_old_dentry
->d_parent
->d_inode
),
1685 mutex_lock(&mdsc
->mutex
);
1686 __register_request(mdsc
, req
, dir
);
1687 __do_request(mdsc
, req
);
1690 if (!req
->r_reply
) {
1691 mutex_unlock(&mdsc
->mutex
);
1692 if (req
->r_timeout
) {
1693 err
= (long)wait_for_completion_interruptible_timeout(
1694 &req
->r_completion
, req
->r_timeout
);
1696 req
->r_reply
= ERR_PTR(-EIO
);
1698 req
->r_reply
= ERR_PTR(err
);
1700 err
= wait_for_completion_interruptible(
1701 &req
->r_completion
);
1703 req
->r_reply
= ERR_PTR(err
);
1705 mutex_lock(&mdsc
->mutex
);
1708 if (IS_ERR(req
->r_reply
)) {
1709 err
= PTR_ERR(req
->r_reply
);
1710 req
->r_reply
= NULL
;
1712 if (err
== -ERESTARTSYS
) {
1714 req
->r_aborted
= true;
1716 if (req
->r_locked_dir
&&
1717 (req
->r_op
& CEPH_MDS_OP_WRITE
)) {
1718 struct ceph_inode_info
*ci
=
1719 ceph_inode(req
->r_locked_dir
);
1721 dout("aborted, clearing I_COMPLETE on %p\n",
1723 spin_lock(&req
->r_locked_dir
->i_lock
);
1724 ci
->i_ceph_flags
&= ~CEPH_I_COMPLETE
;
1725 ci
->i_release_count
++;
1726 spin_unlock(&req
->r_locked_dir
->i_lock
);
1729 /* clean up this request */
1730 __unregister_request(mdsc
, req
);
1731 if (!list_empty(&req
->r_unsafe_item
))
1732 list_del_init(&req
->r_unsafe_item
);
1733 complete(&req
->r_safe_completion
);
1735 } else if (req
->r_err
) {
1738 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
1740 mutex_unlock(&mdsc
->mutex
);
1742 dout("do_request %p done, result %d\n", req
, err
);
1749 * We take the session mutex and parse and process the reply immediately.
1750 * This preserves the logical ordering of replies, capabilities, etc., sent
1751 * by the MDS as they are applied to our local cache.
1753 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
1755 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
1756 struct ceph_mds_request
*req
;
1757 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
1758 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
1761 int mds
= session
->s_mds
;
1763 if (msg
->front
.iov_len
< sizeof(*head
)) {
1764 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
1769 /* get request, session */
1770 tid
= le64_to_cpu(msg
->hdr
.tid
);
1771 mutex_lock(&mdsc
->mutex
);
1772 req
= __lookup_request(mdsc
, tid
);
1774 dout("handle_reply on unknown tid %llu\n", tid
);
1775 mutex_unlock(&mdsc
->mutex
);
1778 dout("handle_reply %p\n", req
);
1780 /* correct session? */
1781 if (!req
->r_session
&& req
->r_session
!= session
) {
1782 pr_err("mdsc_handle_reply got %llu on session mds%d"
1783 " not mds%d\n", tid
, session
->s_mds
,
1784 req
->r_session
? req
->r_session
->s_mds
: -1);
1785 mutex_unlock(&mdsc
->mutex
);
1790 if ((req
->r_got_unsafe
&& !head
->safe
) ||
1791 (req
->r_got_safe
&& head
->safe
)) {
1792 pr_warning("got a dup %s reply on %llu from mds%d\n",
1793 head
->safe
? "safe" : "unsafe", tid
, mds
);
1794 mutex_unlock(&mdsc
->mutex
);
1798 result
= le32_to_cpu(head
->result
);
1801 * Tolerate 2 consecutive ESTALEs from the same mds.
1802 * FIXME: we should be looking at the cap migrate_seq.
1804 if (result
== -ESTALE
) {
1805 req
->r_direct_mode
= USE_AUTH_MDS
;
1807 if (req
->r_num_stale
<= 2) {
1808 __do_request(mdsc
, req
);
1809 mutex_unlock(&mdsc
->mutex
);
1813 req
->r_num_stale
= 0;
1817 req
->r_got_safe
= true;
1818 __unregister_request(mdsc
, req
);
1819 complete(&req
->r_safe_completion
);
1821 if (req
->r_got_unsafe
) {
1823 * We already handled the unsafe response, now do the
1824 * cleanup. No need to examine the response; the MDS
1825 * doesn't include any result info in the safe
1826 * response. And even if it did, there is nothing
1827 * useful we could do with a revised return value.
1829 dout("got safe reply %llu, mds%d\n", tid
, mds
);
1830 list_del_init(&req
->r_unsafe_item
);
1832 /* last unsafe request during umount? */
1833 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
1834 complete(&mdsc
->safe_umount_waiters
);
1835 mutex_unlock(&mdsc
->mutex
);
1840 BUG_ON(req
->r_reply
);
1843 req
->r_got_unsafe
= true;
1844 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
1847 dout("handle_reply tid %lld result %d\n", tid
, result
);
1848 rinfo
= &req
->r_reply_info
;
1849 err
= parse_reply_info(msg
, rinfo
);
1850 mutex_unlock(&mdsc
->mutex
);
1852 mutex_lock(&session
->s_mutex
);
1854 pr_err("mdsc_handle_reply got corrupt reply mds%d\n", mds
);
1860 if (rinfo
->snapblob_len
) {
1861 down_write(&mdsc
->snap_rwsem
);
1862 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
1863 rinfo
->snapblob
+ rinfo
->snapblob_len
,
1864 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
1865 downgrade_write(&mdsc
->snap_rwsem
);
1867 down_read(&mdsc
->snap_rwsem
);
1870 /* insert trace into our cache */
1871 err
= ceph_fill_trace(mdsc
->client
->sb
, req
, req
->r_session
);
1873 if (result
== 0 && rinfo
->dir_nr
)
1874 ceph_readdir_prepopulate(req
, req
->r_session
);
1875 ceph_unreserve_caps(&req
->r_caps_reservation
);
1878 up_read(&mdsc
->snap_rwsem
);
1887 add_cap_releases(mdsc
, req
->r_session
, -1);
1888 mutex_unlock(&session
->s_mutex
);
1890 /* kick calling process */
1891 complete_request(mdsc
, req
);
1893 ceph_mdsc_put_request(req
);
1900 * handle mds notification that our request has been forwarded.
1902 static void handle_forward(struct ceph_mds_client
*mdsc
,
1903 struct ceph_mds_session
*session
,
1904 struct ceph_msg
*msg
)
1906 struct ceph_mds_request
*req
;
1907 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
1911 void *p
= msg
->front
.iov_base
;
1912 void *end
= p
+ msg
->front
.iov_len
;
1914 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
1915 next_mds
= ceph_decode_32(&p
);
1916 fwd_seq
= ceph_decode_32(&p
);
1918 mutex_lock(&mdsc
->mutex
);
1919 req
= __lookup_request(mdsc
, tid
);
1921 dout("forward %llu to mds%d - req dne\n", tid
, next_mds
);
1922 goto out
; /* dup reply? */
1925 if (fwd_seq
<= req
->r_num_fwd
) {
1926 dout("forward %llu to mds%d - old seq %d <= %d\n",
1927 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
1929 /* resend. forward race not possible; mds would drop */
1930 dout("forward %llu to mds%d (we resend)\n", tid
, next_mds
);
1931 req
->r_num_fwd
= fwd_seq
;
1932 req
->r_resend_mds
= next_mds
;
1933 put_request_session(req
);
1934 __do_request(mdsc
, req
);
1936 ceph_mdsc_put_request(req
);
1938 mutex_unlock(&mdsc
->mutex
);
1942 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
1946 * handle a mds session control message
1948 static void handle_session(struct ceph_mds_session
*session
,
1949 struct ceph_msg
*msg
)
1951 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
1954 int mds
= session
->s_mds
;
1955 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
1959 if (msg
->front
.iov_len
!= sizeof(*h
))
1961 op
= le32_to_cpu(h
->op
);
1962 seq
= le64_to_cpu(h
->seq
);
1964 mutex_lock(&mdsc
->mutex
);
1965 if (op
== CEPH_SESSION_CLOSE
)
1966 __unregister_session(mdsc
, session
);
1967 /* FIXME: this ttl calculation is generous */
1968 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
1969 mutex_unlock(&mdsc
->mutex
);
1971 mutex_lock(&session
->s_mutex
);
1973 dout("handle_session mds%d %s %p state %s seq %llu\n",
1974 mds
, ceph_session_op_name(op
), session
,
1975 session_state_name(session
->s_state
), seq
);
1977 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
1978 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
1979 pr_info("mds%d came back\n", session
->s_mds
);
1983 case CEPH_SESSION_OPEN
:
1984 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
1985 renewed_caps(mdsc
, session
, 0);
1988 __close_session(mdsc
, session
);
1991 case CEPH_SESSION_RENEWCAPS
:
1992 if (session
->s_renew_seq
== seq
)
1993 renewed_caps(mdsc
, session
, 1);
1996 case CEPH_SESSION_CLOSE
:
1997 remove_session_caps(session
);
1998 wake
= 1; /* for good measure */
1999 complete(&mdsc
->session_close_waiters
);
2000 kick_requests(mdsc
, mds
, 0); /* cur only */
2003 case CEPH_SESSION_STALE
:
2004 pr_info("mds%d caps went stale, renewing\n",
2006 spin_lock(&session
->s_cap_lock
);
2007 session
->s_cap_gen
++;
2008 session
->s_cap_ttl
= 0;
2009 spin_unlock(&session
->s_cap_lock
);
2010 send_renew_caps(mdsc
, session
);
2013 case CEPH_SESSION_RECALL_STATE
:
2014 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2018 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2022 mutex_unlock(&session
->s_mutex
);
2024 mutex_lock(&mdsc
->mutex
);
2025 __wake_requests(mdsc
, &session
->s_waiting
);
2026 mutex_unlock(&mdsc
->mutex
);
2031 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2032 (int)msg
->front
.iov_len
);
2039 * called under session->mutex.
2041 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2042 struct ceph_mds_session
*session
)
2044 struct ceph_mds_request
*req
, *nreq
;
2047 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2049 mutex_lock(&mdsc
->mutex
);
2050 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2051 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2053 ceph_msg_get(req
->r_request
);
2054 ceph_con_send(&session
->s_con
, req
->r_request
);
2057 mutex_unlock(&mdsc
->mutex
);
2061 * Encode information about a cap for a reconnect with the MDS.
2063 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2066 struct ceph_mds_cap_reconnect rec
;
2067 struct ceph_inode_info
*ci
;
2068 struct ceph_pagelist
*pagelist
= arg
;
2072 struct dentry
*dentry
;
2076 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2077 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2078 ceph_cap_string(cap
->issued
));
2079 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2083 dentry
= d_find_alias(inode
);
2085 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2087 err
= PTR_ERR(path
);
2094 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2098 spin_lock(&inode
->i_lock
);
2099 cap
->seq
= 0; /* reset cap seq */
2100 cap
->issue_seq
= 0; /* and issue_seq */
2101 rec
.cap_id
= cpu_to_le64(cap
->cap_id
);
2102 rec
.pathbase
= cpu_to_le64(pathbase
);
2103 rec
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2104 rec
.issued
= cpu_to_le32(cap
->issued
);
2105 rec
.size
= cpu_to_le64(inode
->i_size
);
2106 ceph_encode_timespec(&rec
.mtime
, &inode
->i_mtime
);
2107 ceph_encode_timespec(&rec
.atime
, &inode
->i_atime
);
2108 rec
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2109 spin_unlock(&inode
->i_lock
);
2111 err
= ceph_pagelist_append(pagelist
, &rec
, sizeof(rec
));
2121 * If an MDS fails and recovers, clients need to reconnect in order to
2122 * reestablish shared state. This includes all caps issued through
2123 * this session _and_ the snap_realm hierarchy. Because it's not
2124 * clear which snap realms the mds cares about, we send everything we
2125 * know about.. that ensures we'll then get any new info the
2126 * recovering MDS might have.
2128 * This is a relatively heavyweight operation, but it's rare.
2130 * called with mdsc->mutex held.
2132 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
, int mds
)
2134 struct ceph_mds_session
*session
= NULL
;
2135 struct ceph_msg
*reply
;
2138 struct ceph_pagelist
*pagelist
;
2140 pr_info("reconnect to recovering mds%d\n", mds
);
2142 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2144 goto fail_nopagelist
;
2145 ceph_pagelist_init(pagelist
);
2147 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, 0, 0, NULL
);
2148 if (IS_ERR(reply
)) {
2149 err
= PTR_ERR(reply
);
2154 session
= __ceph_lookup_mds_session(mdsc
, mds
);
2155 mutex_unlock(&mdsc
->mutex
); /* drop lock for duration */
2158 mutex_lock(&session
->s_mutex
);
2160 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2163 ceph_con_open(&session
->s_con
,
2164 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2166 /* replay unsafe requests */
2167 replay_unsafe_requests(mdsc
, session
);
2169 dout("no session for mds%d, will send short reconnect\n",
2173 down_read(&mdsc
->snap_rwsem
);
2177 dout("session %p state %s\n", session
,
2178 session_state_name(session
->s_state
));
2180 /* traverse this session's caps */
2181 err
= ceph_pagelist_encode_32(pagelist
, session
->s_nr_caps
);
2184 err
= iterate_session_caps(session
, encode_caps_cb
, pagelist
);
2189 * snaprealms. we provide mds with the ino, seq (version), and
2190 * parent for all of our realms. If the mds has any newer info,
2193 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2194 struct ceph_snap_realm
*realm
=
2195 rb_entry(p
, struct ceph_snap_realm
, node
);
2196 struct ceph_mds_snaprealm_reconnect sr_rec
;
2198 dout(" adding snap realm %llx seq %lld parent %llx\n",
2199 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2200 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2201 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2202 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2203 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2209 reply
->pagelist
= pagelist
;
2210 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2211 reply
->nr_pages
= calc_pages_for(0, pagelist
->length
);
2212 ceph_con_send(&session
->s_con
, reply
);
2215 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2216 __wake_requests(mdsc
, &session
->s_waiting
);
2220 up_read(&mdsc
->snap_rwsem
);
2222 mutex_unlock(&session
->s_mutex
);
2223 ceph_put_mds_session(session
);
2225 mutex_lock(&mdsc
->mutex
);
2229 ceph_msg_put(reply
);
2231 ceph_pagelist_release(pagelist
);
2234 pr_err("ENOMEM preparing reconnect for mds%d\n", mds
);
2240 * compare old and new mdsmaps, kicking requests
2241 * and closing out old connections as necessary
2243 * called under mdsc->mutex.
2245 static void check_new_map(struct ceph_mds_client
*mdsc
,
2246 struct ceph_mdsmap
*newmap
,
2247 struct ceph_mdsmap
*oldmap
)
2250 int oldstate
, newstate
;
2251 struct ceph_mds_session
*s
;
2253 dout("check_new_map new %u old %u\n",
2254 newmap
->m_epoch
, oldmap
->m_epoch
);
2256 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2257 if (mdsc
->sessions
[i
] == NULL
)
2259 s
= mdsc
->sessions
[i
];
2260 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2261 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2263 dout("check_new_map mds%d state %s -> %s (session %s)\n",
2264 i
, ceph_mds_state_name(oldstate
),
2265 ceph_mds_state_name(newstate
),
2266 session_state_name(s
->s_state
));
2268 if (memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2269 ceph_mdsmap_get_addr(newmap
, i
),
2270 sizeof(struct ceph_entity_addr
))) {
2271 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2272 /* the session never opened, just close it
2274 __wake_requests(mdsc
, &s
->s_waiting
);
2275 __unregister_session(mdsc
, s
);
2278 mutex_unlock(&mdsc
->mutex
);
2279 mutex_lock(&s
->s_mutex
);
2280 mutex_lock(&mdsc
->mutex
);
2281 ceph_con_close(&s
->s_con
);
2282 mutex_unlock(&s
->s_mutex
);
2283 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2286 /* kick any requests waiting on the recovering mds */
2287 kick_requests(mdsc
, i
, 1);
2288 } else if (oldstate
== newstate
) {
2289 continue; /* nothing new with this mds */
2295 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2296 newstate
>= CEPH_MDS_STATE_RECONNECT
)
2297 send_mds_reconnect(mdsc
, i
);
2300 * kick requests on any mds that has gone active.
2302 * kick requests on cur or forwarder: we may have sent
2303 * the request to mds1, mds1 told us it forwarded it
2304 * to mds2, but then we learn mds1 failed and can't be
2305 * sure it successfully forwarded our request before
2308 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2309 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2310 pr_info("mds%d reconnect completed\n", s
->s_mds
);
2311 kick_requests(mdsc
, i
, 1);
2312 ceph_kick_flushing_caps(mdsc
, s
);
2313 wake_up_session_caps(s
, 1);
2325 * caller must hold session s_mutex, dentry->d_lock
2327 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2329 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2331 ceph_put_mds_session(di
->lease_session
);
2332 di
->lease_session
= NULL
;
2335 static void handle_lease(struct ceph_mds_client
*mdsc
,
2336 struct ceph_mds_session
*session
,
2337 struct ceph_msg
*msg
)
2339 struct super_block
*sb
= mdsc
->client
->sb
;
2340 struct inode
*inode
;
2341 struct ceph_inode_info
*ci
;
2342 struct dentry
*parent
, *dentry
;
2343 struct ceph_dentry_info
*di
;
2344 int mds
= session
->s_mds
;
2345 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2346 struct ceph_vino vino
;
2351 dout("handle_lease from mds%d\n", mds
);
2354 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2356 vino
.ino
= le64_to_cpu(h
->ino
);
2357 vino
.snap
= CEPH_NOSNAP
;
2358 mask
= le16_to_cpu(h
->mask
);
2359 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2360 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2361 if (dname
.len
!= get_unaligned_le32(h
+1))
2364 mutex_lock(&session
->s_mutex
);
2368 inode
= ceph_find_inode(sb
, vino
);
2369 dout("handle_lease '%s', mask %d, ino %llx %p\n",
2370 ceph_lease_op_name(h
->action
), mask
, vino
.ino
, inode
);
2371 if (inode
== NULL
) {
2372 dout("handle_lease no inode %llx\n", vino
.ino
);
2375 ci
= ceph_inode(inode
);
2378 parent
= d_find_alias(inode
);
2380 dout("no parent dentry on inode %p\n", inode
);
2382 goto release
; /* hrm... */
2384 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2385 dentry
= d_lookup(parent
, &dname
);
2390 spin_lock(&dentry
->d_lock
);
2391 di
= ceph_dentry(dentry
);
2392 switch (h
->action
) {
2393 case CEPH_MDS_LEASE_REVOKE
:
2394 if (di
&& di
->lease_session
== session
) {
2395 h
->seq
= cpu_to_le32(di
->lease_seq
);
2396 __ceph_mdsc_drop_dentry_lease(dentry
);
2401 case CEPH_MDS_LEASE_RENEW
:
2402 if (di
&& di
->lease_session
== session
&&
2403 di
->lease_gen
== session
->s_cap_gen
&&
2404 di
->lease_renew_from
&&
2405 di
->lease_renew_after
== 0) {
2406 unsigned long duration
=
2407 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2409 di
->lease_seq
= le32_to_cpu(h
->seq
);
2410 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2411 di
->lease_renew_after
= di
->lease_renew_from
+
2413 di
->lease_renew_from
= 0;
2417 spin_unlock(&dentry
->d_lock
);
2424 /* let's just reuse the same message */
2425 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2427 ceph_con_send(&session
->s_con
, msg
);
2431 mutex_unlock(&session
->s_mutex
);
2435 pr_err("corrupt lease message\n");
2439 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
2440 struct inode
*inode
,
2441 struct dentry
*dentry
, char action
,
2444 struct ceph_msg
*msg
;
2445 struct ceph_mds_lease
*lease
;
2446 int len
= sizeof(*lease
) + sizeof(u32
);
2449 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
2450 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
2451 dnamelen
= dentry
->d_name
.len
;
2454 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, 0, 0, NULL
);
2457 lease
= msg
->front
.iov_base
;
2458 lease
->action
= action
;
2459 lease
->mask
= cpu_to_le16(CEPH_LOCK_DN
);
2460 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
2461 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
2462 lease
->seq
= cpu_to_le32(seq
);
2463 put_unaligned_le32(dnamelen
, lease
+ 1);
2464 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
2467 * if this is a preemptive lease RELEASE, no need to
2468 * flush request stream, since the actual request will
2471 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
2473 ceph_con_send(&session
->s_con
, msg
);
2477 * Preemptively release a lease we expect to invalidate anyway.
2478 * Pass @inode always, @dentry is optional.
2480 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
2481 struct dentry
*dentry
, int mask
)
2483 struct ceph_dentry_info
*di
;
2484 struct ceph_mds_session
*session
;
2487 BUG_ON(inode
== NULL
);
2488 BUG_ON(dentry
== NULL
);
2489 BUG_ON(mask
!= CEPH_LOCK_DN
);
2491 /* is dentry lease valid? */
2492 spin_lock(&dentry
->d_lock
);
2493 di
= ceph_dentry(dentry
);
2494 if (!di
|| !di
->lease_session
||
2495 di
->lease_session
->s_mds
< 0 ||
2496 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
2497 !time_before(jiffies
, dentry
->d_time
)) {
2498 dout("lease_release inode %p dentry %p -- "
2500 inode
, dentry
, mask
);
2501 spin_unlock(&dentry
->d_lock
);
2505 /* we do have a lease on this dentry; note mds and seq */
2506 session
= ceph_get_mds_session(di
->lease_session
);
2507 seq
= di
->lease_seq
;
2508 __ceph_mdsc_drop_dentry_lease(dentry
);
2509 spin_unlock(&dentry
->d_lock
);
2511 dout("lease_release inode %p dentry %p mask %d to mds%d\n",
2512 inode
, dentry
, mask
, session
->s_mds
);
2513 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
2514 CEPH_MDS_LEASE_RELEASE
, seq
);
2515 ceph_put_mds_session(session
);
2519 * drop all leases (and dentry refs) in preparation for umount
2521 static void drop_leases(struct ceph_mds_client
*mdsc
)
2525 dout("drop_leases\n");
2526 mutex_lock(&mdsc
->mutex
);
2527 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2528 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2531 mutex_unlock(&mdsc
->mutex
);
2532 mutex_lock(&s
->s_mutex
);
2533 mutex_unlock(&s
->s_mutex
);
2534 ceph_put_mds_session(s
);
2535 mutex_lock(&mdsc
->mutex
);
2537 mutex_unlock(&mdsc
->mutex
);
2543 * delayed work -- periodically trim expired leases, renew caps with mds
2545 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
2548 unsigned hz
= round_jiffies_relative(HZ
* delay
);
2549 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
2552 static void delayed_work(struct work_struct
*work
)
2555 struct ceph_mds_client
*mdsc
=
2556 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
2560 dout("mdsc delayed_work\n");
2561 ceph_check_delayed_caps(mdsc
);
2563 mutex_lock(&mdsc
->mutex
);
2564 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
2565 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
2566 mdsc
->last_renew_caps
);
2568 mdsc
->last_renew_caps
= jiffies
;
2570 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2571 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
2574 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2575 dout("resending session close request for mds%d\n",
2577 request_close_session(mdsc
, s
);
2578 ceph_put_mds_session(s
);
2581 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
2582 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
2583 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
2584 pr_info("mds%d hung\n", s
->s_mds
);
2587 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
2588 /* this mds is failed or recovering, just wait */
2589 ceph_put_mds_session(s
);
2592 mutex_unlock(&mdsc
->mutex
);
2594 mutex_lock(&s
->s_mutex
);
2596 send_renew_caps(mdsc
, s
);
2598 ceph_con_keepalive(&s
->s_con
);
2599 add_cap_releases(mdsc
, s
, -1);
2600 send_cap_releases(mdsc
, s
);
2601 mutex_unlock(&s
->s_mutex
);
2602 ceph_put_mds_session(s
);
2604 mutex_lock(&mdsc
->mutex
);
2606 mutex_unlock(&mdsc
->mutex
);
2608 schedule_delayed(mdsc
);
2612 int ceph_mdsc_init(struct ceph_mds_client
*mdsc
, struct ceph_client
*client
)
2614 mdsc
->client
= client
;
2615 mutex_init(&mdsc
->mutex
);
2616 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
2617 init_completion(&mdsc
->safe_umount_waiters
);
2618 init_completion(&mdsc
->session_close_waiters
);
2619 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
2620 mdsc
->sessions
= NULL
;
2621 mdsc
->max_sessions
= 0;
2623 init_rwsem(&mdsc
->snap_rwsem
);
2624 mdsc
->snap_realms
= RB_ROOT
;
2625 INIT_LIST_HEAD(&mdsc
->snap_empty
);
2626 spin_lock_init(&mdsc
->snap_empty_lock
);
2628 mdsc
->request_tree
= RB_ROOT
;
2629 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
2630 mdsc
->last_renew_caps
= jiffies
;
2631 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
2632 spin_lock_init(&mdsc
->cap_delay_lock
);
2633 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
2634 spin_lock_init(&mdsc
->snap_flush_lock
);
2635 mdsc
->cap_flush_seq
= 0;
2636 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
2637 mdsc
->num_cap_flushing
= 0;
2638 spin_lock_init(&mdsc
->cap_dirty_lock
);
2639 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
2640 spin_lock_init(&mdsc
->dentry_lru_lock
);
2641 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
2646 * Wait for safe replies on open mds requests. If we time out, drop
2647 * all requests from the tree to avoid dangling dentry refs.
2649 static void wait_requests(struct ceph_mds_client
*mdsc
)
2651 struct ceph_mds_request
*req
;
2652 struct ceph_client
*client
= mdsc
->client
;
2654 mutex_lock(&mdsc
->mutex
);
2655 if (__get_oldest_req(mdsc
)) {
2656 mutex_unlock(&mdsc
->mutex
);
2658 dout("wait_requests waiting for requests\n");
2659 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
2660 client
->mount_args
->mount_timeout
* HZ
);
2662 /* tear down remaining requests */
2663 mutex_lock(&mdsc
->mutex
);
2664 while ((req
= __get_oldest_req(mdsc
))) {
2665 dout("wait_requests timed out on tid %llu\n",
2667 __unregister_request(mdsc
, req
);
2670 mutex_unlock(&mdsc
->mutex
);
2671 dout("wait_requests done\n");
2675 * called before mount is ro, and before dentries are torn down.
2676 * (hmm, does this still race with new lookups?)
2678 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
2680 dout("pre_umount\n");
2684 ceph_flush_dirty_caps(mdsc
);
2685 wait_requests(mdsc
);
2689 * wait for all write mds requests to flush.
2691 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
2693 struct ceph_mds_request
*req
= NULL
, *nextreq
;
2696 mutex_lock(&mdsc
->mutex
);
2697 dout("wait_unsafe_requests want %lld\n", want_tid
);
2699 req
= __get_oldest_req(mdsc
);
2700 while (req
&& req
->r_tid
<= want_tid
) {
2701 /* find next request */
2702 n
= rb_next(&req
->r_node
);
2704 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
2707 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
2709 ceph_mdsc_get_request(req
);
2711 ceph_mdsc_get_request(nextreq
);
2712 mutex_unlock(&mdsc
->mutex
);
2713 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
2714 req
->r_tid
, want_tid
);
2715 wait_for_completion(&req
->r_safe_completion
);
2716 mutex_lock(&mdsc
->mutex
);
2717 ceph_mdsc_put_request(req
);
2719 break; /* next dne before, so we're done! */
2720 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
2721 /* next request was removed from tree */
2722 ceph_mdsc_put_request(nextreq
);
2725 ceph_mdsc_put_request(nextreq
); /* won't go away */
2729 mutex_unlock(&mdsc
->mutex
);
2730 dout("wait_unsafe_requests done\n");
2733 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
2735 u64 want_tid
, want_flush
;
2738 mutex_lock(&mdsc
->mutex
);
2739 want_tid
= mdsc
->last_tid
;
2740 want_flush
= mdsc
->cap_flush_seq
;
2741 mutex_unlock(&mdsc
->mutex
);
2742 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
2744 ceph_flush_dirty_caps(mdsc
);
2746 wait_unsafe_requests(mdsc
, want_tid
);
2747 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
2752 * called after sb is ro.
2754 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
2756 struct ceph_mds_session
*session
;
2759 struct ceph_client
*client
= mdsc
->client
;
2760 unsigned long started
, timeout
= client
->mount_args
->mount_timeout
* HZ
;
2762 dout("close_sessions\n");
2764 mutex_lock(&mdsc
->mutex
);
2766 /* close sessions */
2768 while (time_before(jiffies
, started
+ timeout
)) {
2769 dout("closing sessions\n");
2771 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2772 session
= __ceph_lookup_mds_session(mdsc
, i
);
2775 mutex_unlock(&mdsc
->mutex
);
2776 mutex_lock(&session
->s_mutex
);
2777 __close_session(mdsc
, session
);
2778 mutex_unlock(&session
->s_mutex
);
2779 ceph_put_mds_session(session
);
2780 mutex_lock(&mdsc
->mutex
);
2786 if (client
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
2789 dout("waiting for sessions to close\n");
2790 mutex_unlock(&mdsc
->mutex
);
2791 wait_for_completion_timeout(&mdsc
->session_close_waiters
,
2793 mutex_lock(&mdsc
->mutex
);
2796 /* tear down remaining sessions */
2797 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
2798 if (mdsc
->sessions
[i
]) {
2799 session
= get_session(mdsc
->sessions
[i
]);
2800 __unregister_session(mdsc
, session
);
2801 mutex_unlock(&mdsc
->mutex
);
2802 mutex_lock(&session
->s_mutex
);
2803 remove_session_caps(session
);
2804 mutex_unlock(&session
->s_mutex
);
2805 ceph_put_mds_session(session
);
2806 mutex_lock(&mdsc
->mutex
);
2810 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
2812 mutex_unlock(&mdsc
->mutex
);
2814 ceph_cleanup_empty_realms(mdsc
);
2816 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
2821 void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
2824 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
2826 ceph_mdsmap_destroy(mdsc
->mdsmap
);
2827 kfree(mdsc
->sessions
);
2832 * handle mds map update.
2834 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
2838 void *p
= msg
->front
.iov_base
;
2839 void *end
= p
+ msg
->front
.iov_len
;
2840 struct ceph_mdsmap
*newmap
, *oldmap
;
2841 struct ceph_fsid fsid
;
2844 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
2845 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
2846 if (ceph_check_fsid(mdsc
->client
, &fsid
) < 0)
2848 epoch
= ceph_decode_32(&p
);
2849 maplen
= ceph_decode_32(&p
);
2850 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
2852 /* do we need it? */
2853 ceph_monc_got_mdsmap(&mdsc
->client
->monc
, epoch
);
2854 mutex_lock(&mdsc
->mutex
);
2855 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
2856 dout("handle_map epoch %u <= our %u\n",
2857 epoch
, mdsc
->mdsmap
->m_epoch
);
2858 mutex_unlock(&mdsc
->mutex
);
2862 newmap
= ceph_mdsmap_decode(&p
, end
);
2863 if (IS_ERR(newmap
)) {
2864 err
= PTR_ERR(newmap
);
2868 /* swap into place */
2870 oldmap
= mdsc
->mdsmap
;
2871 mdsc
->mdsmap
= newmap
;
2872 check_new_map(mdsc
, newmap
, oldmap
);
2873 ceph_mdsmap_destroy(oldmap
);
2875 mdsc
->mdsmap
= newmap
; /* first mds map */
2877 mdsc
->client
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
2879 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
2881 mutex_unlock(&mdsc
->mutex
);
2882 schedule_delayed(mdsc
);
2886 mutex_unlock(&mdsc
->mutex
);
2888 pr_err("error decoding mdsmap %d\n", err
);
2892 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
2894 struct ceph_mds_session
*s
= con
->private;
2896 if (get_session(s
)) {
2897 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
2900 dout("mdsc con_get %p FAIL\n", s
);
2904 static void con_put(struct ceph_connection
*con
)
2906 struct ceph_mds_session
*s
= con
->private;
2908 ceph_put_mds_session(s
);
2909 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
));
2913 * if the client is unresponsive for long enough, the mds will kill
2914 * the session entirely.
2916 static void peer_reset(struct ceph_connection
*con
)
2918 struct ceph_mds_session
*s
= con
->private;
2920 pr_err("mds%d gave us the boot. IMPLEMENT RECONNECT.\n",
2924 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
2926 struct ceph_mds_session
*s
= con
->private;
2927 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
2928 int type
= le16_to_cpu(msg
->hdr
.type
);
2930 mutex_lock(&mdsc
->mutex
);
2931 if (__verify_registered_session(mdsc
, s
) < 0) {
2932 mutex_unlock(&mdsc
->mutex
);
2935 mutex_unlock(&mdsc
->mutex
);
2938 case CEPH_MSG_MDS_MAP
:
2939 ceph_mdsc_handle_map(mdsc
, msg
);
2941 case CEPH_MSG_CLIENT_SESSION
:
2942 handle_session(s
, msg
);
2944 case CEPH_MSG_CLIENT_REPLY
:
2945 handle_reply(s
, msg
);
2947 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
2948 handle_forward(mdsc
, s
, msg
);
2950 case CEPH_MSG_CLIENT_CAPS
:
2951 ceph_handle_caps(s
, msg
);
2953 case CEPH_MSG_CLIENT_SNAP
:
2954 ceph_handle_snap(mdsc
, s
, msg
);
2956 case CEPH_MSG_CLIENT_LEASE
:
2957 handle_lease(mdsc
, s
, msg
);
2961 pr_err("received unknown message type %d %s\n", type
,
2962 ceph_msg_type_name(type
));
2971 static int get_authorizer(struct ceph_connection
*con
,
2972 void **buf
, int *len
, int *proto
,
2973 void **reply_buf
, int *reply_len
, int force_new
)
2975 struct ceph_mds_session
*s
= con
->private;
2976 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
2977 struct ceph_auth_client
*ac
= mdsc
->client
->monc
.auth
;
2980 if (force_new
&& s
->s_authorizer
) {
2981 ac
->ops
->destroy_authorizer(ac
, s
->s_authorizer
);
2982 s
->s_authorizer
= NULL
;
2984 if (s
->s_authorizer
== NULL
) {
2985 if (ac
->ops
->create_authorizer
) {
2986 ret
= ac
->ops
->create_authorizer(
2987 ac
, CEPH_ENTITY_TYPE_MDS
,
2989 &s
->s_authorizer_buf
,
2990 &s
->s_authorizer_buf_len
,
2991 &s
->s_authorizer_reply_buf
,
2992 &s
->s_authorizer_reply_buf_len
);
2998 *proto
= ac
->protocol
;
2999 *buf
= s
->s_authorizer_buf
;
3000 *len
= s
->s_authorizer_buf_len
;
3001 *reply_buf
= s
->s_authorizer_reply_buf
;
3002 *reply_len
= s
->s_authorizer_reply_buf_len
;
3007 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3009 struct ceph_mds_session
*s
= con
->private;
3010 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3011 struct ceph_auth_client
*ac
= mdsc
->client
->monc
.auth
;
3013 return ac
->ops
->verify_authorizer_reply(ac
, s
->s_authorizer
, len
);
3016 static int invalidate_authorizer(struct ceph_connection
*con
)
3018 struct ceph_mds_session
*s
= con
->private;
3019 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3020 struct ceph_auth_client
*ac
= mdsc
->client
->monc
.auth
;
3022 if (ac
->ops
->invalidate_authorizer
)
3023 ac
->ops
->invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3025 return ceph_monc_validate_auth(&mdsc
->client
->monc
);
3028 const static struct ceph_connection_operations mds_con_ops
= {
3031 .dispatch
= dispatch
,
3032 .get_authorizer
= get_authorizer
,
3033 .verify_authorizer_reply
= verify_authorizer_reply
,
3034 .invalidate_authorizer
= invalidate_authorizer
,
3035 .peer_reset
= peer_reset
,