1 #include <linux/ceph/ceph_debug.h>
4 #include <linux/wait.h>
5 #include <linux/slab.h>
7 #include <linux/sched.h>
8 #include <linux/debugfs.h>
9 #include <linux/seq_file.h>
12 #include "mds_client.h"
14 #include <linux/ceph/ceph_features.h>
15 #include <linux/ceph/messenger.h>
16 #include <linux/ceph/decode.h>
17 #include <linux/ceph/pagelist.h>
18 #include <linux/ceph/auth.h>
19 #include <linux/ceph/debugfs.h>
22 * A cluster of MDS (metadata server) daemons is responsible for
23 * managing the file system namespace (the directory hierarchy and
24 * inodes) and for coordinating shared access to storage. Metadata is
25 * partitioning hierarchically across a number of servers, and that
26 * partition varies over time as the cluster adjusts the distribution
27 * in order to balance load.
29 * The MDS client is primarily responsible to managing synchronous
30 * metadata requests for operations like open, unlink, and so forth.
31 * If there is a MDS failure, we find out about it when we (possibly
32 * request and) receive a new MDS map, and can resubmit affected
35 * For the most part, though, we take advantage of a lossless
36 * communications channel to the MDS, and do not need to worry about
37 * timing out or resubmitting requests.
39 * We maintain a stateful "session" with each MDS we interact with.
40 * Within each session, we sent periodic heartbeat messages to ensure
41 * any capabilities or leases we have been issues remain valid. If
42 * the session times out and goes stale, our leases and capabilities
43 * are no longer valid.
46 struct ceph_reconnect_state
{
48 struct ceph_pagelist
*pagelist
;
52 static void __wake_requests(struct ceph_mds_client
*mdsc
,
53 struct list_head
*head
);
55 static const struct ceph_connection_operations mds_con_ops
;
63 * parse individual inode info
65 static int parse_reply_info_in(void **p
, void *end
,
66 struct ceph_mds_reply_info_in
*info
,
72 *p
+= sizeof(struct ceph_mds_reply_inode
) +
73 sizeof(*info
->in
->fragtree
.splits
) *
74 le32_to_cpu(info
->in
->fragtree
.nsplits
);
76 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
77 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
79 *p
+= info
->symlink_len
;
81 if (features
& CEPH_FEATURE_DIRLAYOUTHASH
)
82 ceph_decode_copy_safe(p
, end
, &info
->dir_layout
,
83 sizeof(info
->dir_layout
), bad
);
85 memset(&info
->dir_layout
, 0, sizeof(info
->dir_layout
));
87 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
88 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
89 info
->xattr_data
= *p
;
90 *p
+= info
->xattr_len
;
97 * parse a normal reply, which may contain a (dir+)dentry and/or a
100 static int parse_reply_info_trace(void **p
, void *end
,
101 struct ceph_mds_reply_info_parsed
*info
,
106 if (info
->head
->is_dentry
) {
107 err
= parse_reply_info_in(p
, end
, &info
->diri
, features
);
111 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
114 *p
+= sizeof(*info
->dirfrag
) +
115 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
116 if (unlikely(*p
> end
))
119 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
120 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
122 *p
+= info
->dname_len
;
124 *p
+= sizeof(*info
->dlease
);
127 if (info
->head
->is_target
) {
128 err
= parse_reply_info_in(p
, end
, &info
->targeti
, features
);
133 if (unlikely(*p
!= end
))
140 pr_err("problem parsing mds trace %d\n", err
);
145 * parse readdir results
147 static int parse_reply_info_dir(void **p
, void *end
,
148 struct ceph_mds_reply_info_parsed
*info
,
155 if (*p
+ sizeof(*info
->dir_dir
) > end
)
157 *p
+= sizeof(*info
->dir_dir
) +
158 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
162 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
163 num
= ceph_decode_32(p
);
164 info
->dir_end
= ceph_decode_8(p
);
165 info
->dir_complete
= ceph_decode_8(p
);
169 BUG_ON(!info
->dir_in
);
170 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
171 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
172 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
173 if ((unsigned long)(info
->dir_dlease
+ num
) >
174 (unsigned long)info
->dir_in
+ info
->dir_buf_size
) {
175 pr_err("dir contents are larger than expected\n");
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 create results
237 static int parse_reply_info_create(void **p
, void *end
,
238 struct ceph_mds_reply_info_parsed
*info
,
241 if (features
& CEPH_FEATURE_REPLY_CREATE_INODE
) {
243 info
->has_create_ino
= false;
245 info
->has_create_ino
= true;
246 info
->ino
= ceph_decode_64(p
);
250 if (unlikely(*p
!= end
))
259 * parse extra results
261 static int parse_reply_info_extra(void **p
, void *end
,
262 struct ceph_mds_reply_info_parsed
*info
,
265 if (info
->head
->op
== CEPH_MDS_OP_GETFILELOCK
)
266 return parse_reply_info_filelock(p
, end
, info
, features
);
267 else if (info
->head
->op
== CEPH_MDS_OP_READDIR
||
268 info
->head
->op
== CEPH_MDS_OP_LSSNAP
)
269 return parse_reply_info_dir(p
, end
, info
, features
);
270 else if (info
->head
->op
== CEPH_MDS_OP_CREATE
)
271 return parse_reply_info_create(p
, end
, info
, features
);
277 * parse entire mds reply
279 static int parse_reply_info(struct ceph_msg
*msg
,
280 struct ceph_mds_reply_info_parsed
*info
,
287 info
->head
= msg
->front
.iov_base
;
288 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
289 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
292 ceph_decode_32_safe(&p
, end
, len
, bad
);
294 ceph_decode_need(&p
, end
, len
, bad
);
295 err
= parse_reply_info_trace(&p
, p
+len
, info
, features
);
301 ceph_decode_32_safe(&p
, end
, len
, bad
);
303 ceph_decode_need(&p
, end
, len
, bad
);
304 err
= parse_reply_info_extra(&p
, p
+len
, info
, features
);
310 ceph_decode_32_safe(&p
, end
, len
, bad
);
311 info
->snapblob_len
= len
;
322 pr_err("mds parse_reply err %d\n", err
);
326 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
330 free_pages((unsigned long)info
->dir_in
, get_order(info
->dir_buf_size
));
337 static const char *session_state_name(int s
)
340 case CEPH_MDS_SESSION_NEW
: return "new";
341 case CEPH_MDS_SESSION_OPENING
: return "opening";
342 case CEPH_MDS_SESSION_OPEN
: return "open";
343 case CEPH_MDS_SESSION_HUNG
: return "hung";
344 case CEPH_MDS_SESSION_CLOSING
: return "closing";
345 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
346 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
347 default: return "???";
351 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
353 if (atomic_inc_not_zero(&s
->s_ref
)) {
354 dout("mdsc get_session %p %d -> %d\n", s
,
355 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
358 dout("mdsc get_session %p 0 -- FAIL", s
);
363 void ceph_put_mds_session(struct ceph_mds_session
*s
)
365 dout("mdsc put_session %p %d -> %d\n", s
,
366 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
367 if (atomic_dec_and_test(&s
->s_ref
)) {
368 if (s
->s_auth
.authorizer
)
369 ceph_auth_destroy_authorizer(
370 s
->s_mdsc
->fsc
->client
->monc
.auth
,
371 s
->s_auth
.authorizer
);
377 * called under mdsc->mutex
379 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
382 struct ceph_mds_session
*session
;
384 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
386 session
= mdsc
->sessions
[mds
];
387 dout("lookup_mds_session %p %d\n", session
,
388 atomic_read(&session
->s_ref
));
389 get_session(session
);
393 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
395 if (mds
>= mdsc
->max_sessions
)
397 return mdsc
->sessions
[mds
];
400 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
401 struct ceph_mds_session
*s
)
403 if (s
->s_mds
>= mdsc
->max_sessions
||
404 mdsc
->sessions
[s
->s_mds
] != s
)
410 * create+register a new session for given mds.
411 * called under mdsc->mutex.
413 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
416 struct ceph_mds_session
*s
;
418 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
419 return ERR_PTR(-EINVAL
);
421 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
423 return ERR_PTR(-ENOMEM
);
426 s
->s_state
= CEPH_MDS_SESSION_NEW
;
429 mutex_init(&s
->s_mutex
);
431 ceph_con_init(&s
->s_con
, s
, &mds_con_ops
, &mdsc
->fsc
->client
->msgr
);
433 spin_lock_init(&s
->s_gen_ttl_lock
);
435 s
->s_cap_ttl
= jiffies
- 1;
437 spin_lock_init(&s
->s_cap_lock
);
438 s
->s_renew_requested
= 0;
440 INIT_LIST_HEAD(&s
->s_caps
);
443 atomic_set(&s
->s_ref
, 1);
444 INIT_LIST_HEAD(&s
->s_waiting
);
445 INIT_LIST_HEAD(&s
->s_unsafe
);
446 s
->s_num_cap_releases
= 0;
447 s
->s_cap_reconnect
= 0;
448 s
->s_cap_iterator
= NULL
;
449 INIT_LIST_HEAD(&s
->s_cap_releases
);
450 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
451 INIT_LIST_HEAD(&s
->s_cap_flushing
);
452 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
454 dout("register_session mds%d\n", mds
);
455 if (mds
>= mdsc
->max_sessions
) {
456 int newmax
= 1 << get_count_order(mds
+1);
457 struct ceph_mds_session
**sa
;
459 dout("register_session realloc to %d\n", newmax
);
460 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
463 if (mdsc
->sessions
) {
464 memcpy(sa
, mdsc
->sessions
,
465 mdsc
->max_sessions
* sizeof(void *));
466 kfree(mdsc
->sessions
);
469 mdsc
->max_sessions
= newmax
;
471 mdsc
->sessions
[mds
] = s
;
472 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
474 ceph_con_open(&s
->s_con
, CEPH_ENTITY_TYPE_MDS
, mds
,
475 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
481 return ERR_PTR(-ENOMEM
);
485 * called under mdsc->mutex
487 static void __unregister_session(struct ceph_mds_client
*mdsc
,
488 struct ceph_mds_session
*s
)
490 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
491 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
492 mdsc
->sessions
[s
->s_mds
] = NULL
;
493 ceph_con_close(&s
->s_con
);
494 ceph_put_mds_session(s
);
498 * drop session refs in request.
500 * should be last request ref, or hold mdsc->mutex
502 static void put_request_session(struct ceph_mds_request
*req
)
504 if (req
->r_session
) {
505 ceph_put_mds_session(req
->r_session
);
506 req
->r_session
= NULL
;
510 void ceph_mdsc_release_request(struct kref
*kref
)
512 struct ceph_mds_request
*req
= container_of(kref
,
513 struct ceph_mds_request
,
515 destroy_reply_info(&req
->r_reply_info
);
517 ceph_msg_put(req
->r_request
);
519 ceph_msg_put(req
->r_reply
);
521 ceph_put_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
524 if (req
->r_locked_dir
)
525 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
526 if (req
->r_target_inode
)
527 iput(req
->r_target_inode
);
530 if (req
->r_old_dentry
)
531 dput(req
->r_old_dentry
);
532 if (req
->r_old_dentry_dir
) {
534 * track (and drop pins for) r_old_dentry_dir
535 * separately, since r_old_dentry's d_parent may have
536 * changed between the dir mutex being dropped and
537 * this request being freed.
539 ceph_put_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
541 iput(req
->r_old_dentry_dir
);
545 put_request_session(req
);
546 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
551 * lookup session, bump ref if found.
553 * called under mdsc->mutex.
555 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
558 struct ceph_mds_request
*req
;
559 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
562 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
563 if (tid
< req
->r_tid
)
565 else if (tid
> req
->r_tid
)
568 ceph_mdsc_get_request(req
);
575 static void __insert_request(struct ceph_mds_client
*mdsc
,
576 struct ceph_mds_request
*new)
578 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
579 struct rb_node
*parent
= NULL
;
580 struct ceph_mds_request
*req
= NULL
;
584 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
585 if (new->r_tid
< req
->r_tid
)
587 else if (new->r_tid
> req
->r_tid
)
593 rb_link_node(&new->r_node
, parent
, p
);
594 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
601 * Called under mdsc->mutex.
603 static void __register_request(struct ceph_mds_client
*mdsc
,
604 struct ceph_mds_request
*req
,
607 req
->r_tid
= ++mdsc
->last_tid
;
609 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
611 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
612 ceph_mdsc_get_request(req
);
613 __insert_request(mdsc
, req
);
615 req
->r_uid
= current_fsuid();
616 req
->r_gid
= current_fsgid();
619 struct ceph_inode_info
*ci
= ceph_inode(dir
);
622 spin_lock(&ci
->i_unsafe_lock
);
623 req
->r_unsafe_dir
= dir
;
624 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
625 spin_unlock(&ci
->i_unsafe_lock
);
629 static void __unregister_request(struct ceph_mds_client
*mdsc
,
630 struct ceph_mds_request
*req
)
632 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
633 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
634 RB_CLEAR_NODE(&req
->r_node
);
636 if (req
->r_unsafe_dir
) {
637 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
639 spin_lock(&ci
->i_unsafe_lock
);
640 list_del_init(&req
->r_unsafe_dir_item
);
641 spin_unlock(&ci
->i_unsafe_lock
);
643 iput(req
->r_unsafe_dir
);
644 req
->r_unsafe_dir
= NULL
;
647 complete_all(&req
->r_safe_completion
);
649 ceph_mdsc_put_request(req
);
653 * Choose mds to send request to next. If there is a hint set in the
654 * request (e.g., due to a prior forward hint from the mds), use that.
655 * Otherwise, consult frag tree and/or caps to identify the
656 * appropriate mds. If all else fails, choose randomly.
658 * Called under mdsc->mutex.
660 static struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
663 * we don't need to worry about protecting the d_parent access
664 * here because we never renaming inside the snapped namespace
665 * except to resplice to another snapdir, and either the old or new
666 * result is a valid result.
668 while (!IS_ROOT(dentry
) && ceph_snap(dentry
->d_inode
) != CEPH_NOSNAP
)
669 dentry
= dentry
->d_parent
;
673 static int __choose_mds(struct ceph_mds_client
*mdsc
,
674 struct ceph_mds_request
*req
)
677 struct ceph_inode_info
*ci
;
678 struct ceph_cap
*cap
;
679 int mode
= req
->r_direct_mode
;
681 u32 hash
= req
->r_direct_hash
;
682 bool is_hash
= req
->r_direct_is_hash
;
685 * is there a specific mds we should try? ignore hint if we have
686 * no session and the mds is not up (active or recovering).
688 if (req
->r_resend_mds
>= 0 &&
689 (__have_session(mdsc
, req
->r_resend_mds
) ||
690 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
691 dout("choose_mds using resend_mds mds%d\n",
693 return req
->r_resend_mds
;
696 if (mode
== USE_RANDOM_MDS
)
701 inode
= req
->r_inode
;
702 } else if (req
->r_dentry
) {
703 /* ignore race with rename; old or new d_parent is okay */
704 struct dentry
*parent
= req
->r_dentry
->d_parent
;
705 struct inode
*dir
= parent
->d_inode
;
707 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
709 inode
= req
->r_dentry
->d_inode
;
710 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
711 /* direct snapped/virtual snapdir requests
712 * based on parent dir inode */
713 struct dentry
*dn
= get_nonsnap_parent(parent
);
715 dout("__choose_mds using nonsnap parent %p\n", inode
);
718 inode
= req
->r_dentry
->d_inode
;
719 if (!inode
|| mode
== USE_AUTH_MDS
) {
722 hash
= ceph_dentry_hash(dir
, req
->r_dentry
);
728 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
732 ci
= ceph_inode(inode
);
734 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
735 struct ceph_inode_frag frag
;
738 ceph_choose_frag(ci
, hash
, &frag
, &found
);
740 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
743 /* choose a random replica */
744 get_random_bytes(&r
, 1);
747 dout("choose_mds %p %llx.%llx "
748 "frag %u mds%d (%d/%d)\n",
749 inode
, ceph_vinop(inode
),
752 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
753 CEPH_MDS_STATE_ACTIVE
)
757 /* since this file/dir wasn't known to be
758 * replicated, then we want to look for the
759 * authoritative mds. */
762 /* choose auth mds */
764 dout("choose_mds %p %llx.%llx "
765 "frag %u mds%d (auth)\n",
766 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
767 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
768 CEPH_MDS_STATE_ACTIVE
)
774 spin_lock(&ci
->i_ceph_lock
);
776 if (mode
== USE_AUTH_MDS
)
777 cap
= ci
->i_auth_cap
;
778 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
779 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
781 spin_unlock(&ci
->i_ceph_lock
);
784 mds
= cap
->session
->s_mds
;
785 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
786 inode
, ceph_vinop(inode
), mds
,
787 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
788 spin_unlock(&ci
->i_ceph_lock
);
792 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
793 dout("choose_mds chose random mds%d\n", mds
);
801 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
803 struct ceph_msg
*msg
;
804 struct ceph_mds_session_head
*h
;
806 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
,
809 pr_err("create_session_msg ENOMEM creating msg\n");
812 h
= msg
->front
.iov_base
;
813 h
->op
= cpu_to_le32(op
);
814 h
->seq
= cpu_to_le64(seq
);
819 * send session open request.
821 * called under mdsc->mutex
823 static int __open_session(struct ceph_mds_client
*mdsc
,
824 struct ceph_mds_session
*session
)
826 struct ceph_msg
*msg
;
828 int mds
= session
->s_mds
;
830 /* wait for mds to go active? */
831 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
832 dout("open_session to mds%d (%s)\n", mds
,
833 ceph_mds_state_name(mstate
));
834 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
835 session
->s_renew_requested
= jiffies
;
837 /* send connect message */
838 msg
= create_session_msg(CEPH_SESSION_REQUEST_OPEN
, session
->s_seq
);
841 ceph_con_send(&session
->s_con
, msg
);
846 * open sessions for any export targets for the given mds
848 * called under mdsc->mutex
850 static struct ceph_mds_session
*
851 __open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
853 struct ceph_mds_session
*session
;
855 session
= __ceph_lookup_mds_session(mdsc
, target
);
857 session
= register_session(mdsc
, target
);
861 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
862 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
863 __open_session(mdsc
, session
);
868 struct ceph_mds_session
*
869 ceph_mdsc_open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
871 struct ceph_mds_session
*session
;
873 dout("open_export_target_session to mds%d\n", target
);
875 mutex_lock(&mdsc
->mutex
);
876 session
= __open_export_target_session(mdsc
, target
);
877 mutex_unlock(&mdsc
->mutex
);
882 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
883 struct ceph_mds_session
*session
)
885 struct ceph_mds_info
*mi
;
886 struct ceph_mds_session
*ts
;
887 int i
, mds
= session
->s_mds
;
889 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
892 mi
= &mdsc
->mdsmap
->m_info
[mds
];
893 dout("open_export_target_sessions for mds%d (%d targets)\n",
894 session
->s_mds
, mi
->num_export_targets
);
896 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
897 ts
= __open_export_target_session(mdsc
, mi
->export_targets
[i
]);
899 ceph_put_mds_session(ts
);
903 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
904 struct ceph_mds_session
*session
)
906 mutex_lock(&mdsc
->mutex
);
907 __open_export_target_sessions(mdsc
, session
);
908 mutex_unlock(&mdsc
->mutex
);
916 * Free preallocated cap messages assigned to this session
918 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
920 struct ceph_msg
*msg
;
922 spin_lock(&session
->s_cap_lock
);
923 while (!list_empty(&session
->s_cap_releases
)) {
924 msg
= list_first_entry(&session
->s_cap_releases
,
925 struct ceph_msg
, list_head
);
926 list_del_init(&msg
->list_head
);
929 while (!list_empty(&session
->s_cap_releases_done
)) {
930 msg
= list_first_entry(&session
->s_cap_releases_done
,
931 struct ceph_msg
, list_head
);
932 list_del_init(&msg
->list_head
);
935 spin_unlock(&session
->s_cap_lock
);
939 * Helper to safely iterate over all caps associated with a session, with
940 * special care taken to handle a racing __ceph_remove_cap().
942 * Caller must hold session s_mutex.
944 static int iterate_session_caps(struct ceph_mds_session
*session
,
945 int (*cb
)(struct inode
*, struct ceph_cap
*,
949 struct ceph_cap
*cap
;
950 struct inode
*inode
, *last_inode
= NULL
;
951 struct ceph_cap
*old_cap
= NULL
;
954 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
955 spin_lock(&session
->s_cap_lock
);
956 p
= session
->s_caps
.next
;
957 while (p
!= &session
->s_caps
) {
958 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
959 inode
= igrab(&cap
->ci
->vfs_inode
);
964 session
->s_cap_iterator
= cap
;
965 spin_unlock(&session
->s_cap_lock
);
972 ceph_put_cap(session
->s_mdsc
, old_cap
);
976 ret
= cb(inode
, cap
, arg
);
979 spin_lock(&session
->s_cap_lock
);
981 if (cap
->ci
== NULL
) {
982 dout("iterate_session_caps finishing cap %p removal\n",
984 BUG_ON(cap
->session
!= session
);
985 list_del_init(&cap
->session_caps
);
986 session
->s_nr_caps
--;
988 old_cap
= cap
; /* put_cap it w/o locks held */
995 session
->s_cap_iterator
= NULL
;
996 spin_unlock(&session
->s_cap_lock
);
1001 ceph_put_cap(session
->s_mdsc
, old_cap
);
1006 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1009 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1012 dout("removing cap %p, ci is %p, inode is %p\n",
1013 cap
, ci
, &ci
->vfs_inode
);
1014 spin_lock(&ci
->i_ceph_lock
);
1015 __ceph_remove_cap(cap
, false);
1016 if (!__ceph_is_any_real_caps(ci
)) {
1017 struct ceph_mds_client
*mdsc
=
1018 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
1020 spin_lock(&mdsc
->cap_dirty_lock
);
1021 if (!list_empty(&ci
->i_dirty_item
)) {
1022 pr_info(" dropping dirty %s state for %p %lld\n",
1023 ceph_cap_string(ci
->i_dirty_caps
),
1024 inode
, ceph_ino(inode
));
1025 ci
->i_dirty_caps
= 0;
1026 list_del_init(&ci
->i_dirty_item
);
1029 if (!list_empty(&ci
->i_flushing_item
)) {
1030 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1031 ceph_cap_string(ci
->i_flushing_caps
),
1032 inode
, ceph_ino(inode
));
1033 ci
->i_flushing_caps
= 0;
1034 list_del_init(&ci
->i_flushing_item
);
1035 mdsc
->num_cap_flushing
--;
1038 if (drop
&& ci
->i_wrbuffer_ref
) {
1039 pr_info(" dropping dirty data for %p %lld\n",
1040 inode
, ceph_ino(inode
));
1041 ci
->i_wrbuffer_ref
= 0;
1042 ci
->i_wrbuffer_ref_head
= 0;
1045 spin_unlock(&mdsc
->cap_dirty_lock
);
1047 spin_unlock(&ci
->i_ceph_lock
);
1054 * caller must hold session s_mutex
1056 static void remove_session_caps(struct ceph_mds_session
*session
)
1058 dout("remove_session_caps on %p\n", session
);
1059 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
1061 spin_lock(&session
->s_cap_lock
);
1062 if (session
->s_nr_caps
> 0) {
1063 struct super_block
*sb
= session
->s_mdsc
->fsc
->sb
;
1064 struct inode
*inode
;
1065 struct ceph_cap
*cap
, *prev
= NULL
;
1066 struct ceph_vino vino
;
1068 * iterate_session_caps() skips inodes that are being
1069 * deleted, we need to wait until deletions are complete.
1070 * __wait_on_freeing_inode() is designed for the job,
1071 * but it is not exported, so use lookup inode function
1074 while (!list_empty(&session
->s_caps
)) {
1075 cap
= list_entry(session
->s_caps
.next
,
1076 struct ceph_cap
, session_caps
);
1080 vino
= cap
->ci
->i_vino
;
1081 spin_unlock(&session
->s_cap_lock
);
1083 inode
= ceph_find_inode(sb
, vino
);
1086 spin_lock(&session
->s_cap_lock
);
1089 spin_unlock(&session
->s_cap_lock
);
1091 BUG_ON(session
->s_nr_caps
> 0);
1092 BUG_ON(!list_empty(&session
->s_cap_flushing
));
1093 cleanup_cap_releases(session
);
1097 * wake up any threads waiting on this session's caps. if the cap is
1098 * old (didn't get renewed on the client reconnect), remove it now.
1100 * caller must hold s_mutex.
1102 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1105 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1107 wake_up_all(&ci
->i_cap_wq
);
1109 spin_lock(&ci
->i_ceph_lock
);
1110 ci
->i_wanted_max_size
= 0;
1111 ci
->i_requested_max_size
= 0;
1112 spin_unlock(&ci
->i_ceph_lock
);
1117 static void wake_up_session_caps(struct ceph_mds_session
*session
,
1120 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
1121 iterate_session_caps(session
, wake_up_session_cb
,
1122 (void *)(unsigned long)reconnect
);
1126 * Send periodic message to MDS renewing all currently held caps. The
1127 * ack will reset the expiration for all caps from this session.
1129 * caller holds s_mutex
1131 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
1132 struct ceph_mds_session
*session
)
1134 struct ceph_msg
*msg
;
1137 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
1138 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
1139 pr_info("mds%d caps stale\n", session
->s_mds
);
1140 session
->s_renew_requested
= jiffies
;
1142 /* do not try to renew caps until a recovering mds has reconnected
1143 * with its clients. */
1144 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
1145 if (state
< CEPH_MDS_STATE_RECONNECT
) {
1146 dout("send_renew_caps ignoring mds%d (%s)\n",
1147 session
->s_mds
, ceph_mds_state_name(state
));
1151 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
1152 ceph_mds_state_name(state
));
1153 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
1154 ++session
->s_renew_seq
);
1157 ceph_con_send(&session
->s_con
, msg
);
1161 static int send_flushmsg_ack(struct ceph_mds_client
*mdsc
,
1162 struct ceph_mds_session
*session
, u64 seq
)
1164 struct ceph_msg
*msg
;
1166 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1167 session
->s_mds
, session_state_name(session
->s_state
), seq
);
1168 msg
= create_session_msg(CEPH_SESSION_FLUSHMSG_ACK
, seq
);
1171 ceph_con_send(&session
->s_con
, msg
);
1177 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1179 * Called under session->s_mutex
1181 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1182 struct ceph_mds_session
*session
, int is_renew
)
1187 spin_lock(&session
->s_cap_lock
);
1188 was_stale
= is_renew
&& time_after_eq(jiffies
, session
->s_cap_ttl
);
1190 session
->s_cap_ttl
= session
->s_renew_requested
+
1191 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1194 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1195 pr_info("mds%d caps renewed\n", session
->s_mds
);
1198 pr_info("mds%d caps still stale\n", session
->s_mds
);
1201 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1202 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1203 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1204 spin_unlock(&session
->s_cap_lock
);
1207 wake_up_session_caps(session
, 0);
1211 * send a session close request
1213 static int request_close_session(struct ceph_mds_client
*mdsc
,
1214 struct ceph_mds_session
*session
)
1216 struct ceph_msg
*msg
;
1218 dout("request_close_session mds%d state %s seq %lld\n",
1219 session
->s_mds
, session_state_name(session
->s_state
),
1221 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1224 ceph_con_send(&session
->s_con
, msg
);
1229 * Called with s_mutex held.
1231 static int __close_session(struct ceph_mds_client
*mdsc
,
1232 struct ceph_mds_session
*session
)
1234 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1236 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1237 return request_close_session(mdsc
, session
);
1241 * Trim old(er) caps.
1243 * Because we can't cache an inode without one or more caps, we do
1244 * this indirectly: if a cap is unused, we prune its aliases, at which
1245 * point the inode will hopefully get dropped to.
1247 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1248 * memory pressure from the MDS, though, so it needn't be perfect.
1250 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1252 struct ceph_mds_session
*session
= arg
;
1253 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1254 int used
, wanted
, oissued
, mine
;
1256 if (session
->s_trim_caps
<= 0)
1259 spin_lock(&ci
->i_ceph_lock
);
1260 mine
= cap
->issued
| cap
->implemented
;
1261 used
= __ceph_caps_used(ci
);
1262 wanted
= __ceph_caps_file_wanted(ci
);
1263 oissued
= __ceph_caps_issued_other(ci
, cap
);
1265 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1266 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1267 ceph_cap_string(used
), ceph_cap_string(wanted
));
1268 if (cap
== ci
->i_auth_cap
) {
1269 if (ci
->i_dirty_caps
| ci
->i_flushing_caps
)
1271 if ((used
| wanted
) & CEPH_CAP_ANY_WR
)
1274 if ((used
| wanted
) & ~oissued
& mine
)
1275 goto out
; /* we need these caps */
1277 session
->s_trim_caps
--;
1279 /* we aren't the only cap.. just remove us */
1280 __ceph_remove_cap(cap
, true);
1282 /* try to drop referring dentries */
1283 spin_unlock(&ci
->i_ceph_lock
);
1284 d_prune_aliases(inode
);
1285 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1286 inode
, cap
, atomic_read(&inode
->i_count
));
1291 spin_unlock(&ci
->i_ceph_lock
);
1296 * Trim session cap count down to some max number.
1298 static int trim_caps(struct ceph_mds_client
*mdsc
,
1299 struct ceph_mds_session
*session
,
1302 int trim_caps
= session
->s_nr_caps
- max_caps
;
1304 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1305 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1306 if (trim_caps
> 0) {
1307 session
->s_trim_caps
= trim_caps
;
1308 iterate_session_caps(session
, trim_caps_cb
, session
);
1309 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1310 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1311 trim_caps
- session
->s_trim_caps
);
1312 session
->s_trim_caps
= 0;
1315 ceph_add_cap_releases(mdsc
, session
);
1316 ceph_send_cap_releases(mdsc
, session
);
1321 * Allocate cap_release messages. If there is a partially full message
1322 * in the queue, try to allocate enough to cover it's remainder, so that
1323 * we can send it immediately.
1325 * Called under s_mutex.
1327 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1328 struct ceph_mds_session
*session
)
1330 struct ceph_msg
*msg
, *partial
= NULL
;
1331 struct ceph_mds_cap_release
*head
;
1333 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1336 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1339 spin_lock(&session
->s_cap_lock
);
1341 if (!list_empty(&session
->s_cap_releases
)) {
1342 msg
= list_first_entry(&session
->s_cap_releases
,
1345 head
= msg
->front
.iov_base
;
1346 num
= le32_to_cpu(head
->num
);
1348 dout(" partial %p with (%d/%d)\n", msg
, num
,
1349 (int)CEPH_CAPS_PER_RELEASE
);
1350 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1354 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1355 spin_unlock(&session
->s_cap_lock
);
1356 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1360 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1361 (int)msg
->front
.iov_len
);
1362 head
= msg
->front
.iov_base
;
1363 head
->num
= cpu_to_le32(0);
1364 msg
->front
.iov_len
= sizeof(*head
);
1365 spin_lock(&session
->s_cap_lock
);
1366 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1367 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1371 head
= partial
->front
.iov_base
;
1372 num
= le32_to_cpu(head
->num
);
1373 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1374 (int)CEPH_CAPS_PER_RELEASE
);
1375 list_move_tail(&partial
->list_head
,
1376 &session
->s_cap_releases_done
);
1377 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1380 spin_unlock(&session
->s_cap_lock
);
1386 * flush all dirty inode data to disk.
1388 * returns true if we've flushed through want_flush_seq
1390 static int check_cap_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1394 dout("check_cap_flush want %lld\n", want_flush_seq
);
1395 mutex_lock(&mdsc
->mutex
);
1396 for (mds
= 0; ret
&& mds
< mdsc
->max_sessions
; mds
++) {
1397 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1401 get_session(session
);
1402 mutex_unlock(&mdsc
->mutex
);
1404 mutex_lock(&session
->s_mutex
);
1405 if (!list_empty(&session
->s_cap_flushing
)) {
1406 struct ceph_inode_info
*ci
=
1407 list_entry(session
->s_cap_flushing
.next
,
1408 struct ceph_inode_info
,
1410 struct inode
*inode
= &ci
->vfs_inode
;
1412 spin_lock(&ci
->i_ceph_lock
);
1413 if (ci
->i_cap_flush_seq
<= want_flush_seq
) {
1414 dout("check_cap_flush still flushing %p "
1415 "seq %lld <= %lld to mds%d\n", inode
,
1416 ci
->i_cap_flush_seq
, want_flush_seq
,
1420 spin_unlock(&ci
->i_ceph_lock
);
1422 mutex_unlock(&session
->s_mutex
);
1423 ceph_put_mds_session(session
);
1427 mutex_lock(&mdsc
->mutex
);
1430 mutex_unlock(&mdsc
->mutex
);
1431 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1436 * called under s_mutex
1438 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1439 struct ceph_mds_session
*session
)
1441 struct ceph_msg
*msg
;
1443 dout("send_cap_releases mds%d\n", session
->s_mds
);
1444 spin_lock(&session
->s_cap_lock
);
1445 while (!list_empty(&session
->s_cap_releases_done
)) {
1446 msg
= list_first_entry(&session
->s_cap_releases_done
,
1447 struct ceph_msg
, list_head
);
1448 list_del_init(&msg
->list_head
);
1449 spin_unlock(&session
->s_cap_lock
);
1450 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1451 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1452 ceph_con_send(&session
->s_con
, msg
);
1453 spin_lock(&session
->s_cap_lock
);
1455 spin_unlock(&session
->s_cap_lock
);
1458 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1459 struct ceph_mds_session
*session
)
1461 struct ceph_msg
*msg
;
1462 struct ceph_mds_cap_release
*head
;
1465 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1467 if (!list_empty(&session
->s_cap_releases
)) {
1468 /* zero out the in-progress message */
1469 msg
= list_first_entry(&session
->s_cap_releases
,
1470 struct ceph_msg
, list_head
);
1471 head
= msg
->front
.iov_base
;
1472 num
= le32_to_cpu(head
->num
);
1473 dout("discard_cap_releases mds%d %p %u\n",
1474 session
->s_mds
, msg
, num
);
1475 head
->num
= cpu_to_le32(0);
1476 msg
->front
.iov_len
= sizeof(*head
);
1477 session
->s_num_cap_releases
+= num
;
1480 /* requeue completed messages */
1481 while (!list_empty(&session
->s_cap_releases_done
)) {
1482 msg
= list_first_entry(&session
->s_cap_releases_done
,
1483 struct ceph_msg
, list_head
);
1484 list_del_init(&msg
->list_head
);
1486 head
= msg
->front
.iov_base
;
1487 num
= le32_to_cpu(head
->num
);
1488 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1490 session
->s_num_cap_releases
+= num
;
1491 head
->num
= cpu_to_le32(0);
1492 msg
->front
.iov_len
= sizeof(*head
);
1493 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1501 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request
*req
,
1504 struct ceph_inode_info
*ci
= ceph_inode(dir
);
1505 struct ceph_mds_reply_info_parsed
*rinfo
= &req
->r_reply_info
;
1506 struct ceph_mount_options
*opt
= req
->r_mdsc
->fsc
->mount_options
;
1507 size_t size
= sizeof(*rinfo
->dir_in
) + sizeof(*rinfo
->dir_dname_len
) +
1508 sizeof(*rinfo
->dir_dname
) + sizeof(*rinfo
->dir_dlease
);
1509 int order
, num_entries
;
1511 spin_lock(&ci
->i_ceph_lock
);
1512 num_entries
= ci
->i_files
+ ci
->i_subdirs
;
1513 spin_unlock(&ci
->i_ceph_lock
);
1514 num_entries
= max(num_entries
, 1);
1515 num_entries
= min(num_entries
, opt
->max_readdir
);
1517 order
= get_order(size
* num_entries
);
1518 while (order
>= 0) {
1519 rinfo
->dir_in
= (void*)__get_free_pages(GFP_NOFS
| __GFP_NOWARN
,
1528 num_entries
= (PAGE_SIZE
<< order
) / size
;
1529 num_entries
= min(num_entries
, opt
->max_readdir
);
1531 rinfo
->dir_buf_size
= PAGE_SIZE
<< order
;
1532 req
->r_num_caps
= num_entries
+ 1;
1533 req
->r_args
.readdir
.max_entries
= cpu_to_le32(num_entries
);
1534 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(opt
->max_readdir_bytes
);
1539 * Create an mds request.
1541 struct ceph_mds_request
*
1542 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1544 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1547 return ERR_PTR(-ENOMEM
);
1549 mutex_init(&req
->r_fill_mutex
);
1551 req
->r_started
= jiffies
;
1552 req
->r_resend_mds
= -1;
1553 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1555 kref_init(&req
->r_kref
);
1556 INIT_LIST_HEAD(&req
->r_wait
);
1557 init_completion(&req
->r_completion
);
1558 init_completion(&req
->r_safe_completion
);
1559 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1562 req
->r_direct_mode
= mode
;
1567 * return oldest (lowest) request, tid in request tree, 0 if none.
1569 * called under mdsc->mutex.
1571 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1573 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1575 return rb_entry(rb_first(&mdsc
->request_tree
),
1576 struct ceph_mds_request
, r_node
);
1579 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1581 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1589 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1590 * on build_path_from_dentry in fs/cifs/dir.c.
1592 * If @stop_on_nosnap, generate path relative to the first non-snapped
1595 * Encode hidden .snap dirs as a double /, i.e.
1596 * foo/.snap/bar -> foo//bar
1598 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1601 struct dentry
*temp
;
1607 return ERR_PTR(-EINVAL
);
1611 seq
= read_seqbegin(&rename_lock
);
1613 for (temp
= dentry
; !IS_ROOT(temp
);) {
1614 struct inode
*inode
= temp
->d_inode
;
1615 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1616 len
++; /* slash only */
1617 else if (stop_on_nosnap
&& inode
&&
1618 ceph_snap(inode
) == CEPH_NOSNAP
)
1621 len
+= 1 + temp
->d_name
.len
;
1622 temp
= temp
->d_parent
;
1626 len
--; /* no leading '/' */
1628 path
= kmalloc(len
+1, GFP_NOFS
);
1630 return ERR_PTR(-ENOMEM
);
1632 path
[pos
] = 0; /* trailing null */
1634 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1635 struct inode
*inode
;
1637 spin_lock(&temp
->d_lock
);
1638 inode
= temp
->d_inode
;
1639 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1640 dout("build_path path+%d: %p SNAPDIR\n",
1642 } else if (stop_on_nosnap
&& inode
&&
1643 ceph_snap(inode
) == CEPH_NOSNAP
) {
1644 spin_unlock(&temp
->d_lock
);
1647 pos
-= temp
->d_name
.len
;
1649 spin_unlock(&temp
->d_lock
);
1652 strncpy(path
+ pos
, temp
->d_name
.name
,
1655 spin_unlock(&temp
->d_lock
);
1658 temp
= temp
->d_parent
;
1661 if (pos
!= 0 || read_seqretry(&rename_lock
, seq
)) {
1662 pr_err("build_path did not end path lookup where "
1663 "expected, namelen is %d, pos is %d\n", len
, pos
);
1664 /* presumably this is only possible if racing with a
1665 rename of one of the parent directories (we can not
1666 lock the dentries above us to prevent this, but
1667 retrying should be harmless) */
1672 *base
= ceph_ino(temp
->d_inode
);
1674 dout("build_path on %p %d built %llx '%.*s'\n",
1675 dentry
, d_count(dentry
), *base
, len
, path
);
1679 static int build_dentry_path(struct dentry
*dentry
,
1680 const char **ppath
, int *ppathlen
, u64
*pino
,
1685 if (ceph_snap(dentry
->d_parent
->d_inode
) == CEPH_NOSNAP
) {
1686 *pino
= ceph_ino(dentry
->d_parent
->d_inode
);
1687 *ppath
= dentry
->d_name
.name
;
1688 *ppathlen
= dentry
->d_name
.len
;
1691 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1693 return PTR_ERR(path
);
1699 static int build_inode_path(struct inode
*inode
,
1700 const char **ppath
, int *ppathlen
, u64
*pino
,
1703 struct dentry
*dentry
;
1706 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1707 *pino
= ceph_ino(inode
);
1711 dentry
= d_find_alias(inode
);
1712 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1715 return PTR_ERR(path
);
1722 * request arguments may be specified via an inode *, a dentry *, or
1723 * an explicit ino+path.
1725 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1726 const char *rpath
, u64 rino
,
1727 const char **ppath
, int *pathlen
,
1728 u64
*ino
, int *freepath
)
1733 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1734 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1736 } else if (rdentry
) {
1737 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1738 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1740 } else if (rpath
|| rino
) {
1743 *pathlen
= rpath
? strlen(rpath
) : 0;
1744 dout(" path %.*s\n", *pathlen
, rpath
);
1751 * called under mdsc->mutex
1753 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1754 struct ceph_mds_request
*req
,
1757 struct ceph_msg
*msg
;
1758 struct ceph_mds_request_head
*head
;
1759 const char *path1
= NULL
;
1760 const char *path2
= NULL
;
1761 u64 ino1
= 0, ino2
= 0;
1762 int pathlen1
= 0, pathlen2
= 0;
1763 int freepath1
= 0, freepath2
= 0;
1769 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1770 req
->r_path1
, req
->r_ino1
.ino
,
1771 &path1
, &pathlen1
, &ino1
, &freepath1
);
1777 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1778 req
->r_path2
, req
->r_ino2
.ino
,
1779 &path2
, &pathlen2
, &ino2
, &freepath2
);
1785 len
= sizeof(*head
) +
1786 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
));
1788 /* calculate (max) length for cap releases */
1789 len
+= sizeof(struct ceph_mds_request_release
) *
1790 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1791 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1792 if (req
->r_dentry_drop
)
1793 len
+= req
->r_dentry
->d_name
.len
;
1794 if (req
->r_old_dentry_drop
)
1795 len
+= req
->r_old_dentry
->d_name
.len
;
1797 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
, false);
1799 msg
= ERR_PTR(-ENOMEM
);
1803 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1805 head
= msg
->front
.iov_base
;
1806 p
= msg
->front
.iov_base
+ sizeof(*head
);
1807 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1809 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1810 head
->op
= cpu_to_le32(req
->r_op
);
1811 head
->caller_uid
= cpu_to_le32(from_kuid(&init_user_ns
, req
->r_uid
));
1812 head
->caller_gid
= cpu_to_le32(from_kgid(&init_user_ns
, req
->r_gid
));
1813 head
->args
= req
->r_args
;
1815 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1816 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1818 /* make note of release offset, in case we need to replay */
1819 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1823 if (req
->r_inode_drop
)
1824 releases
+= ceph_encode_inode_release(&p
,
1825 req
->r_inode
? req
->r_inode
: req
->r_dentry
->d_inode
,
1826 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1827 if (req
->r_dentry_drop
)
1828 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1829 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1830 if (req
->r_old_dentry_drop
)
1831 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1832 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1833 if (req
->r_old_inode_drop
)
1834 releases
+= ceph_encode_inode_release(&p
,
1835 req
->r_old_dentry
->d_inode
,
1836 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1837 head
->num_releases
= cpu_to_le16(releases
);
1840 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1841 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1843 if (req
->r_data_len
) {
1844 /* outbound data set only by ceph_sync_setxattr() */
1845 BUG_ON(!req
->r_pages
);
1846 ceph_msg_data_add_pages(msg
, req
->r_pages
, req
->r_data_len
, 0);
1849 msg
->hdr
.data_len
= cpu_to_le32(req
->r_data_len
);
1850 msg
->hdr
.data_off
= cpu_to_le16(0);
1854 kfree((char *)path2
);
1857 kfree((char *)path1
);
1863 * called under mdsc->mutex if error, under no mutex if
1866 static void complete_request(struct ceph_mds_client
*mdsc
,
1867 struct ceph_mds_request
*req
)
1869 if (req
->r_callback
)
1870 req
->r_callback(mdsc
, req
);
1872 complete_all(&req
->r_completion
);
1876 * called under mdsc->mutex
1878 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
1879 struct ceph_mds_request
*req
,
1882 struct ceph_mds_request_head
*rhead
;
1883 struct ceph_msg
*msg
;
1888 struct ceph_cap
*cap
=
1889 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
1892 req
->r_sent_on_mseq
= cap
->mseq
;
1894 req
->r_sent_on_mseq
= -1;
1896 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
1897 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
1899 if (req
->r_got_unsafe
) {
1901 * Replay. Do not regenerate message (and rebuild
1902 * paths, etc.); just use the original message.
1903 * Rebuilding paths will break for renames because
1904 * d_move mangles the src name.
1906 msg
= req
->r_request
;
1907 rhead
= msg
->front
.iov_base
;
1909 flags
= le32_to_cpu(rhead
->flags
);
1910 flags
|= CEPH_MDS_FLAG_REPLAY
;
1911 rhead
->flags
= cpu_to_le32(flags
);
1913 if (req
->r_target_inode
)
1914 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
1916 rhead
->num_retry
= req
->r_attempts
- 1;
1918 /* remove cap/dentry releases from message */
1919 rhead
->num_releases
= 0;
1920 msg
->hdr
.front_len
= cpu_to_le32(req
->r_request_release_offset
);
1921 msg
->front
.iov_len
= req
->r_request_release_offset
;
1925 if (req
->r_request
) {
1926 ceph_msg_put(req
->r_request
);
1927 req
->r_request
= NULL
;
1929 msg
= create_request_message(mdsc
, req
, mds
);
1931 req
->r_err
= PTR_ERR(msg
);
1932 complete_request(mdsc
, req
);
1933 return PTR_ERR(msg
);
1935 req
->r_request
= msg
;
1937 rhead
= msg
->front
.iov_base
;
1938 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
1939 if (req
->r_got_unsafe
)
1940 flags
|= CEPH_MDS_FLAG_REPLAY
;
1941 if (req
->r_locked_dir
)
1942 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
1943 rhead
->flags
= cpu_to_le32(flags
);
1944 rhead
->num_fwd
= req
->r_num_fwd
;
1945 rhead
->num_retry
= req
->r_attempts
- 1;
1948 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
1953 * send request, or put it on the appropriate wait list.
1955 static int __do_request(struct ceph_mds_client
*mdsc
,
1956 struct ceph_mds_request
*req
)
1958 struct ceph_mds_session
*session
= NULL
;
1962 if (req
->r_err
|| req
->r_got_result
) {
1964 __unregister_request(mdsc
, req
);
1968 if (req
->r_timeout
&&
1969 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
1970 dout("do_request timed out\n");
1975 put_request_session(req
);
1977 mds
= __choose_mds(mdsc
, req
);
1979 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
1980 dout("do_request no mds or not active, waiting for map\n");
1981 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
1985 /* get, open session */
1986 session
= __ceph_lookup_mds_session(mdsc
, mds
);
1988 session
= register_session(mdsc
, mds
);
1989 if (IS_ERR(session
)) {
1990 err
= PTR_ERR(session
);
1994 req
->r_session
= get_session(session
);
1996 dout("do_request mds%d session %p state %s\n", mds
, session
,
1997 session_state_name(session
->s_state
));
1998 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
1999 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
2000 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
2001 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
2002 __open_session(mdsc
, session
);
2003 list_add(&req
->r_wait
, &session
->s_waiting
);
2008 req
->r_resend_mds
= -1; /* forget any previous mds hint */
2010 if (req
->r_request_started
== 0) /* note request start time */
2011 req
->r_request_started
= jiffies
;
2013 err
= __prepare_send_request(mdsc
, req
, mds
);
2015 ceph_msg_get(req
->r_request
);
2016 ceph_con_send(&session
->s_con
, req
->r_request
);
2020 ceph_put_mds_session(session
);
2026 complete_request(mdsc
, req
);
2031 * called under mdsc->mutex
2033 static void __wake_requests(struct ceph_mds_client
*mdsc
,
2034 struct list_head
*head
)
2036 struct ceph_mds_request
*req
;
2037 LIST_HEAD(tmp_list
);
2039 list_splice_init(head
, &tmp_list
);
2041 while (!list_empty(&tmp_list
)) {
2042 req
= list_entry(tmp_list
.next
,
2043 struct ceph_mds_request
, r_wait
);
2044 list_del_init(&req
->r_wait
);
2045 dout(" wake request %p tid %llu\n", req
, req
->r_tid
);
2046 __do_request(mdsc
, req
);
2051 * Wake up threads with requests pending for @mds, so that they can
2052 * resubmit their requests to a possibly different mds.
2054 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
2056 struct ceph_mds_request
*req
;
2059 dout("kick_requests mds%d\n", mds
);
2060 for (p
= rb_first(&mdsc
->request_tree
); p
; p
= rb_next(p
)) {
2061 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
2062 if (req
->r_got_unsafe
)
2064 if (req
->r_session
&&
2065 req
->r_session
->s_mds
== mds
) {
2066 dout(" kicking tid %llu\n", req
->r_tid
);
2067 __do_request(mdsc
, req
);
2072 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
2073 struct ceph_mds_request
*req
)
2075 dout("submit_request on %p\n", req
);
2076 mutex_lock(&mdsc
->mutex
);
2077 __register_request(mdsc
, req
, NULL
);
2078 __do_request(mdsc
, req
);
2079 mutex_unlock(&mdsc
->mutex
);
2083 * Synchrously perform an mds request. Take care of all of the
2084 * session setup, forwarding, retry details.
2086 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
2088 struct ceph_mds_request
*req
)
2092 dout("do_request on %p\n", req
);
2094 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2096 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
2097 if (req
->r_locked_dir
)
2098 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
2099 if (req
->r_old_dentry_dir
)
2100 ceph_get_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
2104 mutex_lock(&mdsc
->mutex
);
2105 __register_request(mdsc
, req
, dir
);
2106 __do_request(mdsc
, req
);
2110 __unregister_request(mdsc
, req
);
2111 dout("do_request early error %d\n", err
);
2116 mutex_unlock(&mdsc
->mutex
);
2117 dout("do_request waiting\n");
2118 if (req
->r_timeout
) {
2119 err
= (long)wait_for_completion_killable_timeout(
2120 &req
->r_completion
, req
->r_timeout
);
2124 err
= wait_for_completion_killable(&req
->r_completion
);
2126 dout("do_request waited, got %d\n", err
);
2127 mutex_lock(&mdsc
->mutex
);
2129 /* only abort if we didn't race with a real reply */
2130 if (req
->r_got_result
) {
2131 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
2132 } else if (err
< 0) {
2133 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
2136 * ensure we aren't running concurrently with
2137 * ceph_fill_trace or ceph_readdir_prepopulate, which
2138 * rely on locks (dir mutex) held by our caller.
2140 mutex_lock(&req
->r_fill_mutex
);
2142 req
->r_aborted
= true;
2143 mutex_unlock(&req
->r_fill_mutex
);
2145 if (req
->r_locked_dir
&&
2146 (req
->r_op
& CEPH_MDS_OP_WRITE
))
2147 ceph_invalidate_dir_request(req
);
2153 mutex_unlock(&mdsc
->mutex
);
2154 dout("do_request %p done, result %d\n", req
, err
);
2159 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2160 * namespace request.
2162 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
2164 struct inode
*inode
= req
->r_locked_dir
;
2166 dout("invalidate_dir_request %p (complete, lease(s))\n", inode
);
2168 ceph_dir_clear_complete(inode
);
2170 ceph_invalidate_dentry_lease(req
->r_dentry
);
2171 if (req
->r_old_dentry
)
2172 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
2178 * We take the session mutex and parse and process the reply immediately.
2179 * This preserves the logical ordering of replies, capabilities, etc., sent
2180 * by the MDS as they are applied to our local cache.
2182 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
2184 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2185 struct ceph_mds_request
*req
;
2186 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
2187 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
2190 int mds
= session
->s_mds
;
2192 if (msg
->front
.iov_len
< sizeof(*head
)) {
2193 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2198 /* get request, session */
2199 tid
= le64_to_cpu(msg
->hdr
.tid
);
2200 mutex_lock(&mdsc
->mutex
);
2201 req
= __lookup_request(mdsc
, tid
);
2203 dout("handle_reply on unknown tid %llu\n", tid
);
2204 mutex_unlock(&mdsc
->mutex
);
2207 dout("handle_reply %p\n", req
);
2209 /* correct session? */
2210 if (req
->r_session
!= session
) {
2211 pr_err("mdsc_handle_reply got %llu on session mds%d"
2212 " not mds%d\n", tid
, session
->s_mds
,
2213 req
->r_session
? req
->r_session
->s_mds
: -1);
2214 mutex_unlock(&mdsc
->mutex
);
2219 if ((req
->r_got_unsafe
&& !head
->safe
) ||
2220 (req
->r_got_safe
&& head
->safe
)) {
2221 pr_warn("got a dup %s reply on %llu from mds%d\n",
2222 head
->safe
? "safe" : "unsafe", tid
, mds
);
2223 mutex_unlock(&mdsc
->mutex
);
2226 if (req
->r_got_safe
&& !head
->safe
) {
2227 pr_warn("got unsafe after safe on %llu from mds%d\n",
2229 mutex_unlock(&mdsc
->mutex
);
2233 result
= le32_to_cpu(head
->result
);
2237 * if we're not talking to the authority, send to them
2238 * if the authority has changed while we weren't looking,
2239 * send to new authority
2240 * Otherwise we just have to return an ESTALE
2242 if (result
== -ESTALE
) {
2243 dout("got ESTALE on request %llu", req
->r_tid
);
2244 if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2245 dout("not using auth, setting for that now");
2246 req
->r_direct_mode
= USE_AUTH_MDS
;
2247 __do_request(mdsc
, req
);
2248 mutex_unlock(&mdsc
->mutex
);
2251 int mds
= __choose_mds(mdsc
, req
);
2252 if (mds
>= 0 && mds
!= req
->r_session
->s_mds
) {
2253 dout("but auth changed, so resending");
2254 __do_request(mdsc
, req
);
2255 mutex_unlock(&mdsc
->mutex
);
2259 dout("have to return ESTALE on request %llu", req
->r_tid
);
2264 req
->r_got_safe
= true;
2265 __unregister_request(mdsc
, req
);
2267 if (req
->r_got_unsafe
) {
2269 * We already handled the unsafe response, now do the
2270 * cleanup. No need to examine the response; the MDS
2271 * doesn't include any result info in the safe
2272 * response. And even if it did, there is nothing
2273 * useful we could do with a revised return value.
2275 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2276 list_del_init(&req
->r_unsafe_item
);
2278 /* last unsafe request during umount? */
2279 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2280 complete_all(&mdsc
->safe_umount_waiters
);
2281 mutex_unlock(&mdsc
->mutex
);
2285 req
->r_got_unsafe
= true;
2286 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2289 dout("handle_reply tid %lld result %d\n", tid
, result
);
2290 rinfo
= &req
->r_reply_info
;
2291 err
= parse_reply_info(msg
, rinfo
, session
->s_con
.peer_features
);
2292 mutex_unlock(&mdsc
->mutex
);
2294 mutex_lock(&session
->s_mutex
);
2296 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds
, tid
);
2302 if (rinfo
->snapblob_len
) {
2303 down_write(&mdsc
->snap_rwsem
);
2304 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2305 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2306 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
);
2307 downgrade_write(&mdsc
->snap_rwsem
);
2309 down_read(&mdsc
->snap_rwsem
);
2312 /* insert trace into our cache */
2313 mutex_lock(&req
->r_fill_mutex
);
2314 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2316 if (result
== 0 && (req
->r_op
== CEPH_MDS_OP_READDIR
||
2317 req
->r_op
== CEPH_MDS_OP_LSSNAP
))
2318 ceph_readdir_prepopulate(req
, req
->r_session
);
2319 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2321 mutex_unlock(&req
->r_fill_mutex
);
2323 up_read(&mdsc
->snap_rwsem
);
2325 mutex_lock(&mdsc
->mutex
);
2326 if (!req
->r_aborted
) {
2332 req
->r_got_result
= true;
2335 dout("reply arrived after request %lld was aborted\n", tid
);
2337 mutex_unlock(&mdsc
->mutex
);
2339 ceph_add_cap_releases(mdsc
, req
->r_session
);
2340 mutex_unlock(&session
->s_mutex
);
2342 /* kick calling process */
2343 complete_request(mdsc
, req
);
2345 ceph_mdsc_put_request(req
);
2352 * handle mds notification that our request has been forwarded.
2354 static void handle_forward(struct ceph_mds_client
*mdsc
,
2355 struct ceph_mds_session
*session
,
2356 struct ceph_msg
*msg
)
2358 struct ceph_mds_request
*req
;
2359 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2363 void *p
= msg
->front
.iov_base
;
2364 void *end
= p
+ msg
->front
.iov_len
;
2366 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2367 next_mds
= ceph_decode_32(&p
);
2368 fwd_seq
= ceph_decode_32(&p
);
2370 mutex_lock(&mdsc
->mutex
);
2371 req
= __lookup_request(mdsc
, tid
);
2373 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2374 goto out
; /* dup reply? */
2377 if (req
->r_aborted
) {
2378 dout("forward tid %llu aborted, unregistering\n", tid
);
2379 __unregister_request(mdsc
, req
);
2380 } else if (fwd_seq
<= req
->r_num_fwd
) {
2381 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2382 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2384 /* resend. forward race not possible; mds would drop */
2385 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2387 BUG_ON(req
->r_got_result
);
2388 req
->r_num_fwd
= fwd_seq
;
2389 req
->r_resend_mds
= next_mds
;
2390 put_request_session(req
);
2391 __do_request(mdsc
, req
);
2393 ceph_mdsc_put_request(req
);
2395 mutex_unlock(&mdsc
->mutex
);
2399 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2403 * handle a mds session control message
2405 static void handle_session(struct ceph_mds_session
*session
,
2406 struct ceph_msg
*msg
)
2408 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2411 int mds
= session
->s_mds
;
2412 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2416 if (msg
->front
.iov_len
!= sizeof(*h
))
2418 op
= le32_to_cpu(h
->op
);
2419 seq
= le64_to_cpu(h
->seq
);
2421 mutex_lock(&mdsc
->mutex
);
2422 if (op
== CEPH_SESSION_CLOSE
)
2423 __unregister_session(mdsc
, session
);
2424 /* FIXME: this ttl calculation is generous */
2425 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2426 mutex_unlock(&mdsc
->mutex
);
2428 mutex_lock(&session
->s_mutex
);
2430 dout("handle_session mds%d %s %p state %s seq %llu\n",
2431 mds
, ceph_session_op_name(op
), session
,
2432 session_state_name(session
->s_state
), seq
);
2434 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2435 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2436 pr_info("mds%d came back\n", session
->s_mds
);
2440 case CEPH_SESSION_OPEN
:
2441 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2442 pr_info("mds%d reconnect success\n", session
->s_mds
);
2443 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2444 renewed_caps(mdsc
, session
, 0);
2447 __close_session(mdsc
, session
);
2450 case CEPH_SESSION_RENEWCAPS
:
2451 if (session
->s_renew_seq
== seq
)
2452 renewed_caps(mdsc
, session
, 1);
2455 case CEPH_SESSION_CLOSE
:
2456 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2457 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2458 remove_session_caps(session
);
2459 wake
= 1; /* for good measure */
2460 wake_up_all(&mdsc
->session_close_wq
);
2461 kick_requests(mdsc
, mds
);
2464 case CEPH_SESSION_STALE
:
2465 pr_info("mds%d caps went stale, renewing\n",
2467 spin_lock(&session
->s_gen_ttl_lock
);
2468 session
->s_cap_gen
++;
2469 session
->s_cap_ttl
= jiffies
- 1;
2470 spin_unlock(&session
->s_gen_ttl_lock
);
2471 send_renew_caps(mdsc
, session
);
2474 case CEPH_SESSION_RECALL_STATE
:
2475 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2478 case CEPH_SESSION_FLUSHMSG
:
2479 send_flushmsg_ack(mdsc
, session
, seq
);
2483 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2487 mutex_unlock(&session
->s_mutex
);
2489 mutex_lock(&mdsc
->mutex
);
2490 __wake_requests(mdsc
, &session
->s_waiting
);
2491 mutex_unlock(&mdsc
->mutex
);
2496 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2497 (int)msg
->front
.iov_len
);
2504 * called under session->mutex.
2506 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2507 struct ceph_mds_session
*session
)
2509 struct ceph_mds_request
*req
, *nreq
;
2512 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2514 mutex_lock(&mdsc
->mutex
);
2515 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2516 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
);
2518 ceph_msg_get(req
->r_request
);
2519 ceph_con_send(&session
->s_con
, req
->r_request
);
2522 mutex_unlock(&mdsc
->mutex
);
2526 * Encode information about a cap for a reconnect with the MDS.
2528 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2532 struct ceph_mds_cap_reconnect v2
;
2533 struct ceph_mds_cap_reconnect_v1 v1
;
2536 struct ceph_inode_info
*ci
;
2537 struct ceph_reconnect_state
*recon_state
= arg
;
2538 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2542 struct dentry
*dentry
;
2546 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2547 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2548 ceph_cap_string(cap
->issued
));
2549 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2553 dentry
= d_find_alias(inode
);
2555 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2557 err
= PTR_ERR(path
);
2564 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2568 spin_lock(&ci
->i_ceph_lock
);
2569 cap
->seq
= 0; /* reset cap seq */
2570 cap
->issue_seq
= 0; /* and issue_seq */
2571 cap
->mseq
= 0; /* and migrate_seq */
2572 cap
->cap_gen
= cap
->session
->s_cap_gen
;
2574 if (recon_state
->flock
) {
2575 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2576 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2577 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2578 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2579 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2580 rec
.v2
.flock_len
= 0;
2581 reclen
= sizeof(rec
.v2
);
2583 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2584 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2585 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2586 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2587 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2588 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2589 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2590 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2591 reclen
= sizeof(rec
.v1
);
2593 spin_unlock(&ci
->i_ceph_lock
);
2595 if (recon_state
->flock
) {
2596 int num_fcntl_locks
, num_flock_locks
;
2597 struct ceph_filelock
*flocks
;
2600 spin_lock(&inode
->i_lock
);
2601 ceph_count_locks(inode
, &num_fcntl_locks
, &num_flock_locks
);
2602 spin_unlock(&inode
->i_lock
);
2603 flocks
= kmalloc((num_fcntl_locks
+num_flock_locks
) *
2604 sizeof(struct ceph_filelock
), GFP_NOFS
);
2609 spin_lock(&inode
->i_lock
);
2610 err
= ceph_encode_locks_to_buffer(inode
, flocks
,
2613 spin_unlock(&inode
->i_lock
);
2621 * number of encoded locks is stable, so copy to pagelist
2623 rec
.v2
.flock_len
= cpu_to_le32(2*sizeof(u32
) +
2624 (num_fcntl_locks
+num_flock_locks
) *
2625 sizeof(struct ceph_filelock
));
2626 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2628 err
= ceph_locks_to_pagelist(flocks
, pagelist
,
2633 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2636 recon_state
->nr_caps
++;
2646 * If an MDS fails and recovers, clients need to reconnect in order to
2647 * reestablish shared state. This includes all caps issued through
2648 * this session _and_ the snap_realm hierarchy. Because it's not
2649 * clear which snap realms the mds cares about, we send everything we
2650 * know about.. that ensures we'll then get any new info the
2651 * recovering MDS might have.
2653 * This is a relatively heavyweight operation, but it's rare.
2655 * called with mdsc->mutex held.
2657 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2658 struct ceph_mds_session
*session
)
2660 struct ceph_msg
*reply
;
2662 int mds
= session
->s_mds
;
2665 struct ceph_pagelist
*pagelist
;
2666 struct ceph_reconnect_state recon_state
;
2668 pr_info("mds%d reconnect start\n", mds
);
2670 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2672 goto fail_nopagelist
;
2673 ceph_pagelist_init(pagelist
);
2675 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
, false);
2679 mutex_lock(&session
->s_mutex
);
2680 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2683 ceph_con_close(&session
->s_con
);
2684 ceph_con_open(&session
->s_con
,
2685 CEPH_ENTITY_TYPE_MDS
, mds
,
2686 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2688 /* replay unsafe requests */
2689 replay_unsafe_requests(mdsc
, session
);
2691 down_read(&mdsc
->snap_rwsem
);
2693 dout("session %p state %s\n", session
,
2694 session_state_name(session
->s_state
));
2696 spin_lock(&session
->s_gen_ttl_lock
);
2697 session
->s_cap_gen
++;
2698 spin_unlock(&session
->s_gen_ttl_lock
);
2700 spin_lock(&session
->s_cap_lock
);
2702 * notify __ceph_remove_cap() that we are composing cap reconnect.
2703 * If a cap get released before being added to the cap reconnect,
2704 * __ceph_remove_cap() should skip queuing cap release.
2706 session
->s_cap_reconnect
= 1;
2707 /* drop old cap expires; we're about to reestablish that state */
2708 discard_cap_releases(mdsc
, session
);
2709 spin_unlock(&session
->s_cap_lock
);
2711 /* traverse this session's caps */
2712 s_nr_caps
= session
->s_nr_caps
;
2713 err
= ceph_pagelist_encode_32(pagelist
, s_nr_caps
);
2717 recon_state
.nr_caps
= 0;
2718 recon_state
.pagelist
= pagelist
;
2719 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2720 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2724 spin_lock(&session
->s_cap_lock
);
2725 session
->s_cap_reconnect
= 0;
2726 spin_unlock(&session
->s_cap_lock
);
2729 * snaprealms. we provide mds with the ino, seq (version), and
2730 * parent for all of our realms. If the mds has any newer info,
2733 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2734 struct ceph_snap_realm
*realm
=
2735 rb_entry(p
, struct ceph_snap_realm
, node
);
2736 struct ceph_mds_snaprealm_reconnect sr_rec
;
2738 dout(" adding snap realm %llx seq %lld parent %llx\n",
2739 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2740 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2741 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2742 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2743 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2748 if (recon_state
.flock
)
2749 reply
->hdr
.version
= cpu_to_le16(2);
2751 /* raced with cap release? */
2752 if (s_nr_caps
!= recon_state
.nr_caps
) {
2753 struct page
*page
= list_first_entry(&pagelist
->head
,
2755 __le32
*addr
= kmap_atomic(page
);
2756 *addr
= cpu_to_le32(recon_state
.nr_caps
);
2757 kunmap_atomic(addr
);
2760 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2761 ceph_msg_data_add_pagelist(reply
, pagelist
);
2762 ceph_con_send(&session
->s_con
, reply
);
2764 mutex_unlock(&session
->s_mutex
);
2766 mutex_lock(&mdsc
->mutex
);
2767 __wake_requests(mdsc
, &session
->s_waiting
);
2768 mutex_unlock(&mdsc
->mutex
);
2770 up_read(&mdsc
->snap_rwsem
);
2774 ceph_msg_put(reply
);
2775 up_read(&mdsc
->snap_rwsem
);
2776 mutex_unlock(&session
->s_mutex
);
2778 ceph_pagelist_release(pagelist
);
2781 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2787 * compare old and new mdsmaps, kicking requests
2788 * and closing out old connections as necessary
2790 * called under mdsc->mutex.
2792 static void check_new_map(struct ceph_mds_client
*mdsc
,
2793 struct ceph_mdsmap
*newmap
,
2794 struct ceph_mdsmap
*oldmap
)
2797 int oldstate
, newstate
;
2798 struct ceph_mds_session
*s
;
2800 dout("check_new_map new %u old %u\n",
2801 newmap
->m_epoch
, oldmap
->m_epoch
);
2803 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2804 if (mdsc
->sessions
[i
] == NULL
)
2806 s
= mdsc
->sessions
[i
];
2807 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
2808 newstate
= ceph_mdsmap_get_state(newmap
, i
);
2810 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
2811 i
, ceph_mds_state_name(oldstate
),
2812 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
2813 ceph_mds_state_name(newstate
),
2814 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
2815 session_state_name(s
->s_state
));
2817 if (i
>= newmap
->m_max_mds
||
2818 memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
2819 ceph_mdsmap_get_addr(newmap
, i
),
2820 sizeof(struct ceph_entity_addr
))) {
2821 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
2822 /* the session never opened, just close it
2824 __wake_requests(mdsc
, &s
->s_waiting
);
2825 __unregister_session(mdsc
, s
);
2828 mutex_unlock(&mdsc
->mutex
);
2829 mutex_lock(&s
->s_mutex
);
2830 mutex_lock(&mdsc
->mutex
);
2831 ceph_con_close(&s
->s_con
);
2832 mutex_unlock(&s
->s_mutex
);
2833 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
2836 /* kick any requests waiting on the recovering mds */
2837 kick_requests(mdsc
, i
);
2838 } else if (oldstate
== newstate
) {
2839 continue; /* nothing new with this mds */
2845 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
2846 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
2847 mutex_unlock(&mdsc
->mutex
);
2848 send_mds_reconnect(mdsc
, s
);
2849 mutex_lock(&mdsc
->mutex
);
2853 * kick request on any mds that has gone active.
2855 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
2856 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
2857 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
2858 oldstate
!= CEPH_MDS_STATE_STARTING
)
2859 pr_info("mds%d recovery completed\n", s
->s_mds
);
2860 kick_requests(mdsc
, i
);
2861 ceph_kick_flushing_caps(mdsc
, s
);
2862 wake_up_session_caps(s
, 1);
2866 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
2867 s
= mdsc
->sessions
[i
];
2870 if (!ceph_mdsmap_is_laggy(newmap
, i
))
2872 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
2873 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
2874 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
2875 dout(" connecting to export targets of laggy mds%d\n",
2877 __open_export_target_sessions(mdsc
, s
);
2889 * caller must hold session s_mutex, dentry->d_lock
2891 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
2893 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
2895 ceph_put_mds_session(di
->lease_session
);
2896 di
->lease_session
= NULL
;
2899 static void handle_lease(struct ceph_mds_client
*mdsc
,
2900 struct ceph_mds_session
*session
,
2901 struct ceph_msg
*msg
)
2903 struct super_block
*sb
= mdsc
->fsc
->sb
;
2904 struct inode
*inode
;
2905 struct dentry
*parent
, *dentry
;
2906 struct ceph_dentry_info
*di
;
2907 int mds
= session
->s_mds
;
2908 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
2910 struct ceph_vino vino
;
2914 dout("handle_lease from mds%d\n", mds
);
2917 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
2919 vino
.ino
= le64_to_cpu(h
->ino
);
2920 vino
.snap
= CEPH_NOSNAP
;
2921 seq
= le32_to_cpu(h
->seq
);
2922 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
2923 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
2924 if (dname
.len
!= get_unaligned_le32(h
+1))
2927 mutex_lock(&session
->s_mutex
);
2931 inode
= ceph_find_inode(sb
, vino
);
2932 dout("handle_lease %s, ino %llx %p %.*s\n",
2933 ceph_lease_op_name(h
->action
), vino
.ino
, inode
,
2934 dname
.len
, dname
.name
);
2935 if (inode
== NULL
) {
2936 dout("handle_lease no inode %llx\n", vino
.ino
);
2941 parent
= d_find_alias(inode
);
2943 dout("no parent dentry on inode %p\n", inode
);
2945 goto release
; /* hrm... */
2947 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
2948 dentry
= d_lookup(parent
, &dname
);
2953 spin_lock(&dentry
->d_lock
);
2954 di
= ceph_dentry(dentry
);
2955 switch (h
->action
) {
2956 case CEPH_MDS_LEASE_REVOKE
:
2957 if (di
->lease_session
== session
) {
2958 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
2959 h
->seq
= cpu_to_le32(di
->lease_seq
);
2960 __ceph_mdsc_drop_dentry_lease(dentry
);
2965 case CEPH_MDS_LEASE_RENEW
:
2966 if (di
->lease_session
== session
&&
2967 di
->lease_gen
== session
->s_cap_gen
&&
2968 di
->lease_renew_from
&&
2969 di
->lease_renew_after
== 0) {
2970 unsigned long duration
=
2971 le32_to_cpu(h
->duration_ms
) * HZ
/ 1000;
2973 di
->lease_seq
= seq
;
2974 dentry
->d_time
= di
->lease_renew_from
+ duration
;
2975 di
->lease_renew_after
= di
->lease_renew_from
+
2977 di
->lease_renew_from
= 0;
2981 spin_unlock(&dentry
->d_lock
);
2988 /* let's just reuse the same message */
2989 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
2991 ceph_con_send(&session
->s_con
, msg
);
2995 mutex_unlock(&session
->s_mutex
);
2999 pr_err("corrupt lease message\n");
3003 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
3004 struct inode
*inode
,
3005 struct dentry
*dentry
, char action
,
3008 struct ceph_msg
*msg
;
3009 struct ceph_mds_lease
*lease
;
3010 int len
= sizeof(*lease
) + sizeof(u32
);
3013 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3014 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
3015 dnamelen
= dentry
->d_name
.len
;
3018 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
, false);
3021 lease
= msg
->front
.iov_base
;
3022 lease
->action
= action
;
3023 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
3024 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
3025 lease
->seq
= cpu_to_le32(seq
);
3026 put_unaligned_le32(dnamelen
, lease
+ 1);
3027 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
3030 * if this is a preemptive lease RELEASE, no need to
3031 * flush request stream, since the actual request will
3034 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
3036 ceph_con_send(&session
->s_con
, msg
);
3040 * Preemptively release a lease we expect to invalidate anyway.
3041 * Pass @inode always, @dentry is optional.
3043 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
3044 struct dentry
*dentry
)
3046 struct ceph_dentry_info
*di
;
3047 struct ceph_mds_session
*session
;
3050 BUG_ON(inode
== NULL
);
3051 BUG_ON(dentry
== NULL
);
3053 /* is dentry lease valid? */
3054 spin_lock(&dentry
->d_lock
);
3055 di
= ceph_dentry(dentry
);
3056 if (!di
|| !di
->lease_session
||
3057 di
->lease_session
->s_mds
< 0 ||
3058 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
3059 !time_before(jiffies
, dentry
->d_time
)) {
3060 dout("lease_release inode %p dentry %p -- "
3063 spin_unlock(&dentry
->d_lock
);
3067 /* we do have a lease on this dentry; note mds and seq */
3068 session
= ceph_get_mds_session(di
->lease_session
);
3069 seq
= di
->lease_seq
;
3070 __ceph_mdsc_drop_dentry_lease(dentry
);
3071 spin_unlock(&dentry
->d_lock
);
3073 dout("lease_release inode %p dentry %p to mds%d\n",
3074 inode
, dentry
, session
->s_mds
);
3075 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
3076 CEPH_MDS_LEASE_RELEASE
, seq
);
3077 ceph_put_mds_session(session
);
3081 * drop all leases (and dentry refs) in preparation for umount
3083 static void drop_leases(struct ceph_mds_client
*mdsc
)
3087 dout("drop_leases\n");
3088 mutex_lock(&mdsc
->mutex
);
3089 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3090 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3093 mutex_unlock(&mdsc
->mutex
);
3094 mutex_lock(&s
->s_mutex
);
3095 mutex_unlock(&s
->s_mutex
);
3096 ceph_put_mds_session(s
);
3097 mutex_lock(&mdsc
->mutex
);
3099 mutex_unlock(&mdsc
->mutex
);
3105 * delayed work -- periodically trim expired leases, renew caps with mds
3107 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
3110 unsigned hz
= round_jiffies_relative(HZ
* delay
);
3111 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
3114 static void delayed_work(struct work_struct
*work
)
3117 struct ceph_mds_client
*mdsc
=
3118 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
3122 dout("mdsc delayed_work\n");
3123 ceph_check_delayed_caps(mdsc
);
3125 mutex_lock(&mdsc
->mutex
);
3126 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
3127 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
3128 mdsc
->last_renew_caps
);
3130 mdsc
->last_renew_caps
= jiffies
;
3132 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3133 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3136 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3137 dout("resending session close request for mds%d\n",
3139 request_close_session(mdsc
, s
);
3140 ceph_put_mds_session(s
);
3143 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
3144 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
3145 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
3146 pr_info("mds%d hung\n", s
->s_mds
);
3149 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
3150 /* this mds is failed or recovering, just wait */
3151 ceph_put_mds_session(s
);
3154 mutex_unlock(&mdsc
->mutex
);
3156 mutex_lock(&s
->s_mutex
);
3158 send_renew_caps(mdsc
, s
);
3160 ceph_con_keepalive(&s
->s_con
);
3161 ceph_add_cap_releases(mdsc
, s
);
3162 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3163 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
3164 ceph_send_cap_releases(mdsc
, s
);
3165 mutex_unlock(&s
->s_mutex
);
3166 ceph_put_mds_session(s
);
3168 mutex_lock(&mdsc
->mutex
);
3170 mutex_unlock(&mdsc
->mutex
);
3172 schedule_delayed(mdsc
);
3175 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
3178 struct ceph_mds_client
*mdsc
;
3180 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
3185 mutex_init(&mdsc
->mutex
);
3186 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
3187 if (mdsc
->mdsmap
== NULL
) {
3192 init_completion(&mdsc
->safe_umount_waiters
);
3193 init_waitqueue_head(&mdsc
->session_close_wq
);
3194 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
3195 mdsc
->sessions
= NULL
;
3196 mdsc
->max_sessions
= 0;
3198 init_rwsem(&mdsc
->snap_rwsem
);
3199 mdsc
->snap_realms
= RB_ROOT
;
3200 INIT_LIST_HEAD(&mdsc
->snap_empty
);
3201 spin_lock_init(&mdsc
->snap_empty_lock
);
3203 mdsc
->request_tree
= RB_ROOT
;
3204 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
3205 mdsc
->last_renew_caps
= jiffies
;
3206 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
3207 spin_lock_init(&mdsc
->cap_delay_lock
);
3208 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
3209 spin_lock_init(&mdsc
->snap_flush_lock
);
3210 mdsc
->cap_flush_seq
= 0;
3211 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
3212 INIT_LIST_HEAD(&mdsc
->cap_dirty_migrating
);
3213 mdsc
->num_cap_flushing
= 0;
3214 spin_lock_init(&mdsc
->cap_dirty_lock
);
3215 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
3216 spin_lock_init(&mdsc
->dentry_lru_lock
);
3217 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
3219 ceph_caps_init(mdsc
);
3220 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
3226 * Wait for safe replies on open mds requests. If we time out, drop
3227 * all requests from the tree to avoid dangling dentry refs.
3229 static void wait_requests(struct ceph_mds_client
*mdsc
)
3231 struct ceph_mds_request
*req
;
3232 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3234 mutex_lock(&mdsc
->mutex
);
3235 if (__get_oldest_req(mdsc
)) {
3236 mutex_unlock(&mdsc
->mutex
);
3238 dout("wait_requests waiting for requests\n");
3239 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
3240 fsc
->client
->options
->mount_timeout
* HZ
);
3242 /* tear down remaining requests */
3243 mutex_lock(&mdsc
->mutex
);
3244 while ((req
= __get_oldest_req(mdsc
))) {
3245 dout("wait_requests timed out on tid %llu\n",
3247 __unregister_request(mdsc
, req
);
3250 mutex_unlock(&mdsc
->mutex
);
3251 dout("wait_requests done\n");
3255 * called before mount is ro, and before dentries are torn down.
3256 * (hmm, does this still race with new lookups?)
3258 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
3260 dout("pre_umount\n");
3264 ceph_flush_dirty_caps(mdsc
);
3265 wait_requests(mdsc
);
3268 * wait for reply handlers to drop their request refs and
3269 * their inode/dcache refs
3275 * wait for all write mds requests to flush.
3277 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3279 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3282 mutex_lock(&mdsc
->mutex
);
3283 dout("wait_unsafe_requests want %lld\n", want_tid
);
3285 req
= __get_oldest_req(mdsc
);
3286 while (req
&& req
->r_tid
<= want_tid
) {
3287 /* find next request */
3288 n
= rb_next(&req
->r_node
);
3290 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3293 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3295 ceph_mdsc_get_request(req
);
3297 ceph_mdsc_get_request(nextreq
);
3298 mutex_unlock(&mdsc
->mutex
);
3299 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3300 req
->r_tid
, want_tid
);
3301 wait_for_completion(&req
->r_safe_completion
);
3302 mutex_lock(&mdsc
->mutex
);
3303 ceph_mdsc_put_request(req
);
3305 break; /* next dne before, so we're done! */
3306 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3307 /* next request was removed from tree */
3308 ceph_mdsc_put_request(nextreq
);
3311 ceph_mdsc_put_request(nextreq
); /* won't go away */
3315 mutex_unlock(&mdsc
->mutex
);
3316 dout("wait_unsafe_requests done\n");
3319 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3321 u64 want_tid
, want_flush
;
3323 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3327 mutex_lock(&mdsc
->mutex
);
3328 want_tid
= mdsc
->last_tid
;
3329 want_flush
= mdsc
->cap_flush_seq
;
3330 mutex_unlock(&mdsc
->mutex
);
3331 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3333 ceph_flush_dirty_caps(mdsc
);
3335 wait_unsafe_requests(mdsc
, want_tid
);
3336 wait_event(mdsc
->cap_flushing_wq
, check_cap_flush(mdsc
, want_flush
));
3340 * true if all sessions are closed, or we force unmount
3342 static bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3346 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3349 mutex_lock(&mdsc
->mutex
);
3350 for (i
= 0; i
< mdsc
->max_sessions
; i
++)
3351 if (mdsc
->sessions
[i
])
3353 mutex_unlock(&mdsc
->mutex
);
3358 * called after sb is ro.
3360 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3362 struct ceph_mds_session
*session
;
3364 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3365 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3367 dout("close_sessions\n");
3369 /* close sessions */
3370 mutex_lock(&mdsc
->mutex
);
3371 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3372 session
= __ceph_lookup_mds_session(mdsc
, i
);
3375 mutex_unlock(&mdsc
->mutex
);
3376 mutex_lock(&session
->s_mutex
);
3377 __close_session(mdsc
, session
);
3378 mutex_unlock(&session
->s_mutex
);
3379 ceph_put_mds_session(session
);
3380 mutex_lock(&mdsc
->mutex
);
3382 mutex_unlock(&mdsc
->mutex
);
3384 dout("waiting for sessions to close\n");
3385 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3388 /* tear down remaining sessions */
3389 mutex_lock(&mdsc
->mutex
);
3390 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3391 if (mdsc
->sessions
[i
]) {
3392 session
= get_session(mdsc
->sessions
[i
]);
3393 __unregister_session(mdsc
, session
);
3394 mutex_unlock(&mdsc
->mutex
);
3395 mutex_lock(&session
->s_mutex
);
3396 remove_session_caps(session
);
3397 mutex_unlock(&session
->s_mutex
);
3398 ceph_put_mds_session(session
);
3399 mutex_lock(&mdsc
->mutex
);
3402 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3403 mutex_unlock(&mdsc
->mutex
);
3405 ceph_cleanup_empty_realms(mdsc
);
3407 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3412 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3415 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3417 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3418 kfree(mdsc
->sessions
);
3419 ceph_caps_finalize(mdsc
);
3422 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3424 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3426 dout("mdsc_destroy %p\n", mdsc
);
3427 ceph_mdsc_stop(mdsc
);
3429 /* flush out any connection work with references to us */
3434 dout("mdsc_destroy %p done\n", mdsc
);
3439 * handle mds map update.
3441 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3445 void *p
= msg
->front
.iov_base
;
3446 void *end
= p
+ msg
->front
.iov_len
;
3447 struct ceph_mdsmap
*newmap
, *oldmap
;
3448 struct ceph_fsid fsid
;
3451 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3452 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3453 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3455 epoch
= ceph_decode_32(&p
);
3456 maplen
= ceph_decode_32(&p
);
3457 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3459 /* do we need it? */
3460 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3461 mutex_lock(&mdsc
->mutex
);
3462 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3463 dout("handle_map epoch %u <= our %u\n",
3464 epoch
, mdsc
->mdsmap
->m_epoch
);
3465 mutex_unlock(&mdsc
->mutex
);
3469 newmap
= ceph_mdsmap_decode(&p
, end
);
3470 if (IS_ERR(newmap
)) {
3471 err
= PTR_ERR(newmap
);
3475 /* swap into place */
3477 oldmap
= mdsc
->mdsmap
;
3478 mdsc
->mdsmap
= newmap
;
3479 check_new_map(mdsc
, newmap
, oldmap
);
3480 ceph_mdsmap_destroy(oldmap
);
3482 mdsc
->mdsmap
= newmap
; /* first mds map */
3484 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3486 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3488 mutex_unlock(&mdsc
->mutex
);
3489 schedule_delayed(mdsc
);
3493 mutex_unlock(&mdsc
->mutex
);
3495 pr_err("error decoding mdsmap %d\n", err
);
3499 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3501 struct ceph_mds_session
*s
= con
->private;
3503 if (get_session(s
)) {
3504 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3507 dout("mdsc con_get %p FAIL\n", s
);
3511 static void con_put(struct ceph_connection
*con
)
3513 struct ceph_mds_session
*s
= con
->private;
3515 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
) - 1);
3516 ceph_put_mds_session(s
);
3520 * if the client is unresponsive for long enough, the mds will kill
3521 * the session entirely.
3523 static void peer_reset(struct ceph_connection
*con
)
3525 struct ceph_mds_session
*s
= con
->private;
3526 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3528 pr_warn("mds%d closed our session\n", s
->s_mds
);
3529 send_mds_reconnect(mdsc
, s
);
3532 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3534 struct ceph_mds_session
*s
= con
->private;
3535 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3536 int type
= le16_to_cpu(msg
->hdr
.type
);
3538 mutex_lock(&mdsc
->mutex
);
3539 if (__verify_registered_session(mdsc
, s
) < 0) {
3540 mutex_unlock(&mdsc
->mutex
);
3543 mutex_unlock(&mdsc
->mutex
);
3546 case CEPH_MSG_MDS_MAP
:
3547 ceph_mdsc_handle_map(mdsc
, msg
);
3549 case CEPH_MSG_CLIENT_SESSION
:
3550 handle_session(s
, msg
);
3552 case CEPH_MSG_CLIENT_REPLY
:
3553 handle_reply(s
, msg
);
3555 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3556 handle_forward(mdsc
, s
, msg
);
3558 case CEPH_MSG_CLIENT_CAPS
:
3559 ceph_handle_caps(s
, msg
);
3561 case CEPH_MSG_CLIENT_SNAP
:
3562 ceph_handle_snap(mdsc
, s
, msg
);
3564 case CEPH_MSG_CLIENT_LEASE
:
3565 handle_lease(mdsc
, s
, msg
);
3569 pr_err("received unknown message type %d %s\n", type
,
3570 ceph_msg_type_name(type
));
3581 * Note: returned pointer is the address of a structure that's
3582 * managed separately. Caller must *not* attempt to free it.
3584 static struct ceph_auth_handshake
*get_authorizer(struct ceph_connection
*con
,
3585 int *proto
, int force_new
)
3587 struct ceph_mds_session
*s
= con
->private;
3588 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3589 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3590 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
3592 if (force_new
&& auth
->authorizer
) {
3593 ceph_auth_destroy_authorizer(ac
, auth
->authorizer
);
3594 auth
->authorizer
= NULL
;
3596 if (!auth
->authorizer
) {
3597 int ret
= ceph_auth_create_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3600 return ERR_PTR(ret
);
3602 int ret
= ceph_auth_update_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3605 return ERR_PTR(ret
);
3607 *proto
= ac
->protocol
;
3613 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3615 struct ceph_mds_session
*s
= con
->private;
3616 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3617 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3619 return ceph_auth_verify_authorizer_reply(ac
, s
->s_auth
.authorizer
, len
);
3622 static int invalidate_authorizer(struct ceph_connection
*con
)
3624 struct ceph_mds_session
*s
= con
->private;
3625 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3626 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3628 ceph_auth_invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3630 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3633 static struct ceph_msg
*mds_alloc_msg(struct ceph_connection
*con
,
3634 struct ceph_msg_header
*hdr
, int *skip
)
3636 struct ceph_msg
*msg
;
3637 int type
= (int) le16_to_cpu(hdr
->type
);
3638 int front_len
= (int) le32_to_cpu(hdr
->front_len
);
3644 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
3646 pr_err("unable to allocate msg type %d len %d\n",
3654 static const struct ceph_connection_operations mds_con_ops
= {
3657 .dispatch
= dispatch
,
3658 .get_authorizer
= get_authorizer
,
3659 .verify_authorizer_reply
= verify_authorizer_reply
,
3660 .invalidate_authorizer
= invalidate_authorizer
,
3661 .peer_reset
= peer_reset
,
3662 .alloc_msg
= mds_alloc_msg
,