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>
10 #include <linux/utsname.h>
13 #include "mds_client.h"
15 #include <linux/ceph/ceph_features.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/decode.h>
18 #include <linux/ceph/pagelist.h>
19 #include <linux/ceph/auth.h>
20 #include <linux/ceph/debugfs.h>
23 * A cluster of MDS (metadata server) daemons is responsible for
24 * managing the file system namespace (the directory hierarchy and
25 * inodes) and for coordinating shared access to storage. Metadata is
26 * partitioning hierarchically across a number of servers, and that
27 * partition varies over time as the cluster adjusts the distribution
28 * in order to balance load.
30 * The MDS client is primarily responsible to managing synchronous
31 * metadata requests for operations like open, unlink, and so forth.
32 * If there is a MDS failure, we find out about it when we (possibly
33 * request and) receive a new MDS map, and can resubmit affected
36 * For the most part, though, we take advantage of a lossless
37 * communications channel to the MDS, and do not need to worry about
38 * timing out or resubmitting requests.
40 * We maintain a stateful "session" with each MDS we interact with.
41 * Within each session, we sent periodic heartbeat messages to ensure
42 * any capabilities or leases we have been issues remain valid. If
43 * the session times out and goes stale, our leases and capabilities
44 * are no longer valid.
47 struct ceph_reconnect_state
{
49 struct ceph_pagelist
*pagelist
;
53 static void __wake_requests(struct ceph_mds_client
*mdsc
,
54 struct list_head
*head
);
56 static const struct ceph_connection_operations mds_con_ops
;
64 * parse individual inode info
66 static int parse_reply_info_in(void **p
, void *end
,
67 struct ceph_mds_reply_info_in
*info
,
73 *p
+= sizeof(struct ceph_mds_reply_inode
) +
74 sizeof(*info
->in
->fragtree
.splits
) *
75 le32_to_cpu(info
->in
->fragtree
.nsplits
);
77 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
78 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
80 *p
+= info
->symlink_len
;
82 if (features
& CEPH_FEATURE_DIRLAYOUTHASH
)
83 ceph_decode_copy_safe(p
, end
, &info
->dir_layout
,
84 sizeof(info
->dir_layout
), bad
);
86 memset(&info
->dir_layout
, 0, sizeof(info
->dir_layout
));
88 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
89 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
90 info
->xattr_data
= *p
;
91 *p
+= info
->xattr_len
;
93 if (features
& CEPH_FEATURE_MDS_INLINE_DATA
) {
94 ceph_decode_64_safe(p
, end
, info
->inline_version
, bad
);
95 ceph_decode_32_safe(p
, end
, info
->inline_len
, bad
);
96 ceph_decode_need(p
, end
, info
->inline_len
, bad
);
97 info
->inline_data
= *p
;
98 *p
+= info
->inline_len
;
100 info
->inline_version
= CEPH_INLINE_NONE
;
108 * parse a normal reply, which may contain a (dir+)dentry and/or a
111 static int parse_reply_info_trace(void **p
, void *end
,
112 struct ceph_mds_reply_info_parsed
*info
,
117 if (info
->head
->is_dentry
) {
118 err
= parse_reply_info_in(p
, end
, &info
->diri
, features
);
122 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
125 *p
+= sizeof(*info
->dirfrag
) +
126 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
127 if (unlikely(*p
> end
))
130 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
131 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
133 *p
+= info
->dname_len
;
135 *p
+= sizeof(*info
->dlease
);
138 if (info
->head
->is_target
) {
139 err
= parse_reply_info_in(p
, end
, &info
->targeti
, features
);
144 if (unlikely(*p
!= end
))
151 pr_err("problem parsing mds trace %d\n", err
);
156 * parse readdir results
158 static int parse_reply_info_dir(void **p
, void *end
,
159 struct ceph_mds_reply_info_parsed
*info
,
166 if (*p
+ sizeof(*info
->dir_dir
) > end
)
168 *p
+= sizeof(*info
->dir_dir
) +
169 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
173 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
174 num
= ceph_decode_32(p
);
175 info
->dir_end
= ceph_decode_8(p
);
176 info
->dir_complete
= ceph_decode_8(p
);
180 BUG_ON(!info
->dir_in
);
181 info
->dir_dname
= (void *)(info
->dir_in
+ num
);
182 info
->dir_dname_len
= (void *)(info
->dir_dname
+ num
);
183 info
->dir_dlease
= (void *)(info
->dir_dname_len
+ num
);
184 if ((unsigned long)(info
->dir_dlease
+ num
) >
185 (unsigned long)info
->dir_in
+ info
->dir_buf_size
) {
186 pr_err("dir contents are larger than expected\n");
194 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
195 info
->dir_dname_len
[i
] = ceph_decode_32(p
);
196 ceph_decode_need(p
, end
, info
->dir_dname_len
[i
], bad
);
197 info
->dir_dname
[i
] = *p
;
198 *p
+= info
->dir_dname_len
[i
];
199 dout("parsed dir dname '%.*s'\n", info
->dir_dname_len
[i
],
201 info
->dir_dlease
[i
] = *p
;
202 *p
+= sizeof(struct ceph_mds_reply_lease
);
205 err
= parse_reply_info_in(p
, end
, &info
->dir_in
[i
], features
);
220 pr_err("problem parsing dir contents %d\n", err
);
225 * parse fcntl F_GETLK results
227 static int parse_reply_info_filelock(void **p
, void *end
,
228 struct ceph_mds_reply_info_parsed
*info
,
231 if (*p
+ sizeof(*info
->filelock_reply
) > end
)
234 info
->filelock_reply
= *p
;
235 *p
+= sizeof(*info
->filelock_reply
);
237 if (unlikely(*p
!= end
))
246 * parse create results
248 static int parse_reply_info_create(void **p
, void *end
,
249 struct ceph_mds_reply_info_parsed
*info
,
252 if (features
& CEPH_FEATURE_REPLY_CREATE_INODE
) {
254 info
->has_create_ino
= false;
256 info
->has_create_ino
= true;
257 info
->ino
= ceph_decode_64(p
);
261 if (unlikely(*p
!= end
))
270 * parse extra results
272 static int parse_reply_info_extra(void **p
, void *end
,
273 struct ceph_mds_reply_info_parsed
*info
,
276 if (info
->head
->op
== CEPH_MDS_OP_GETFILELOCK
)
277 return parse_reply_info_filelock(p
, end
, info
, features
);
278 else if (info
->head
->op
== CEPH_MDS_OP_READDIR
||
279 info
->head
->op
== CEPH_MDS_OP_LSSNAP
)
280 return parse_reply_info_dir(p
, end
, info
, features
);
281 else if (info
->head
->op
== CEPH_MDS_OP_CREATE
)
282 return parse_reply_info_create(p
, end
, info
, features
);
288 * parse entire mds reply
290 static int parse_reply_info(struct ceph_msg
*msg
,
291 struct ceph_mds_reply_info_parsed
*info
,
298 info
->head
= msg
->front
.iov_base
;
299 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
300 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
303 ceph_decode_32_safe(&p
, end
, len
, bad
);
305 ceph_decode_need(&p
, end
, len
, bad
);
306 err
= parse_reply_info_trace(&p
, p
+len
, info
, features
);
312 ceph_decode_32_safe(&p
, end
, len
, bad
);
314 ceph_decode_need(&p
, end
, len
, bad
);
315 err
= parse_reply_info_extra(&p
, p
+len
, info
, features
);
321 ceph_decode_32_safe(&p
, end
, len
, bad
);
322 info
->snapblob_len
= len
;
333 pr_err("mds parse_reply err %d\n", err
);
337 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
341 free_pages((unsigned long)info
->dir_in
, get_order(info
->dir_buf_size
));
348 const char *ceph_session_state_name(int s
)
351 case CEPH_MDS_SESSION_NEW
: return "new";
352 case CEPH_MDS_SESSION_OPENING
: return "opening";
353 case CEPH_MDS_SESSION_OPEN
: return "open";
354 case CEPH_MDS_SESSION_HUNG
: return "hung";
355 case CEPH_MDS_SESSION_CLOSING
: return "closing";
356 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
357 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
358 default: return "???";
362 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
364 if (atomic_inc_not_zero(&s
->s_ref
)) {
365 dout("mdsc get_session %p %d -> %d\n", s
,
366 atomic_read(&s
->s_ref
)-1, atomic_read(&s
->s_ref
));
369 dout("mdsc get_session %p 0 -- FAIL", s
);
374 void ceph_put_mds_session(struct ceph_mds_session
*s
)
376 dout("mdsc put_session %p %d -> %d\n", s
,
377 atomic_read(&s
->s_ref
), atomic_read(&s
->s_ref
)-1);
378 if (atomic_dec_and_test(&s
->s_ref
)) {
379 if (s
->s_auth
.authorizer
)
380 ceph_auth_destroy_authorizer(
381 s
->s_mdsc
->fsc
->client
->monc
.auth
,
382 s
->s_auth
.authorizer
);
388 * called under mdsc->mutex
390 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
393 struct ceph_mds_session
*session
;
395 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
397 session
= mdsc
->sessions
[mds
];
398 dout("lookup_mds_session %p %d\n", session
,
399 atomic_read(&session
->s_ref
));
400 get_session(session
);
404 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
406 if (mds
>= mdsc
->max_sessions
)
408 return mdsc
->sessions
[mds
];
411 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
412 struct ceph_mds_session
*s
)
414 if (s
->s_mds
>= mdsc
->max_sessions
||
415 mdsc
->sessions
[s
->s_mds
] != s
)
421 * create+register a new session for given mds.
422 * called under mdsc->mutex.
424 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
427 struct ceph_mds_session
*s
;
429 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
430 return ERR_PTR(-EINVAL
);
432 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
434 return ERR_PTR(-ENOMEM
);
437 s
->s_state
= CEPH_MDS_SESSION_NEW
;
440 mutex_init(&s
->s_mutex
);
442 ceph_con_init(&s
->s_con
, s
, &mds_con_ops
, &mdsc
->fsc
->client
->msgr
);
444 spin_lock_init(&s
->s_gen_ttl_lock
);
446 s
->s_cap_ttl
= jiffies
- 1;
448 spin_lock_init(&s
->s_cap_lock
);
449 s
->s_renew_requested
= 0;
451 INIT_LIST_HEAD(&s
->s_caps
);
454 atomic_set(&s
->s_ref
, 1);
455 INIT_LIST_HEAD(&s
->s_waiting
);
456 INIT_LIST_HEAD(&s
->s_unsafe
);
457 s
->s_num_cap_releases
= 0;
458 s
->s_cap_reconnect
= 0;
459 s
->s_cap_iterator
= NULL
;
460 INIT_LIST_HEAD(&s
->s_cap_releases
);
461 INIT_LIST_HEAD(&s
->s_cap_releases_done
);
462 INIT_LIST_HEAD(&s
->s_cap_flushing
);
463 INIT_LIST_HEAD(&s
->s_cap_snaps_flushing
);
465 dout("register_session mds%d\n", mds
);
466 if (mds
>= mdsc
->max_sessions
) {
467 int newmax
= 1 << get_count_order(mds
+1);
468 struct ceph_mds_session
**sa
;
470 dout("register_session realloc to %d\n", newmax
);
471 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
474 if (mdsc
->sessions
) {
475 memcpy(sa
, mdsc
->sessions
,
476 mdsc
->max_sessions
* sizeof(void *));
477 kfree(mdsc
->sessions
);
480 mdsc
->max_sessions
= newmax
;
482 mdsc
->sessions
[mds
] = s
;
483 atomic_inc(&mdsc
->num_sessions
);
484 atomic_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
486 ceph_con_open(&s
->s_con
, CEPH_ENTITY_TYPE_MDS
, mds
,
487 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
493 return ERR_PTR(-ENOMEM
);
497 * called under mdsc->mutex
499 static void __unregister_session(struct ceph_mds_client
*mdsc
,
500 struct ceph_mds_session
*s
)
502 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
503 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
504 mdsc
->sessions
[s
->s_mds
] = NULL
;
505 ceph_con_close(&s
->s_con
);
506 ceph_put_mds_session(s
);
507 atomic_dec(&mdsc
->num_sessions
);
511 * drop session refs in request.
513 * should be last request ref, or hold mdsc->mutex
515 static void put_request_session(struct ceph_mds_request
*req
)
517 if (req
->r_session
) {
518 ceph_put_mds_session(req
->r_session
);
519 req
->r_session
= NULL
;
523 void ceph_mdsc_release_request(struct kref
*kref
)
525 struct ceph_mds_request
*req
= container_of(kref
,
526 struct ceph_mds_request
,
528 destroy_reply_info(&req
->r_reply_info
);
530 ceph_msg_put(req
->r_request
);
532 ceph_msg_put(req
->r_reply
);
534 ceph_put_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
537 if (req
->r_locked_dir
)
538 ceph_put_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
539 iput(req
->r_target_inode
);
542 if (req
->r_old_dentry
)
543 dput(req
->r_old_dentry
);
544 if (req
->r_old_dentry_dir
) {
546 * track (and drop pins for) r_old_dentry_dir
547 * separately, since r_old_dentry's d_parent may have
548 * changed between the dir mutex being dropped and
549 * this request being freed.
551 ceph_put_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
553 iput(req
->r_old_dentry_dir
);
558 ceph_pagelist_release(req
->r_pagelist
);
559 put_request_session(req
);
560 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
565 * lookup session, bump ref if found.
567 * called under mdsc->mutex.
569 static struct ceph_mds_request
*__lookup_request(struct ceph_mds_client
*mdsc
,
572 struct ceph_mds_request
*req
;
573 struct rb_node
*n
= mdsc
->request_tree
.rb_node
;
576 req
= rb_entry(n
, struct ceph_mds_request
, r_node
);
577 if (tid
< req
->r_tid
)
579 else if (tid
> req
->r_tid
)
582 ceph_mdsc_get_request(req
);
589 static void __insert_request(struct ceph_mds_client
*mdsc
,
590 struct ceph_mds_request
*new)
592 struct rb_node
**p
= &mdsc
->request_tree
.rb_node
;
593 struct rb_node
*parent
= NULL
;
594 struct ceph_mds_request
*req
= NULL
;
598 req
= rb_entry(parent
, struct ceph_mds_request
, r_node
);
599 if (new->r_tid
< req
->r_tid
)
601 else if (new->r_tid
> req
->r_tid
)
607 rb_link_node(&new->r_node
, parent
, p
);
608 rb_insert_color(&new->r_node
, &mdsc
->request_tree
);
612 * Register an in-flight request, and assign a tid. Link to directory
613 * are modifying (if any).
615 * Called under mdsc->mutex.
617 static void __register_request(struct ceph_mds_client
*mdsc
,
618 struct ceph_mds_request
*req
,
621 req
->r_tid
= ++mdsc
->last_tid
;
623 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
625 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
626 ceph_mdsc_get_request(req
);
627 __insert_request(mdsc
, req
);
629 req
->r_uid
= current_fsuid();
630 req
->r_gid
= current_fsgid();
633 struct ceph_inode_info
*ci
= ceph_inode(dir
);
636 spin_lock(&ci
->i_unsafe_lock
);
637 req
->r_unsafe_dir
= dir
;
638 list_add_tail(&req
->r_unsafe_dir_item
, &ci
->i_unsafe_dirops
);
639 spin_unlock(&ci
->i_unsafe_lock
);
643 static void __unregister_request(struct ceph_mds_client
*mdsc
,
644 struct ceph_mds_request
*req
)
646 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
647 rb_erase(&req
->r_node
, &mdsc
->request_tree
);
648 RB_CLEAR_NODE(&req
->r_node
);
650 if (req
->r_unsafe_dir
) {
651 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
653 spin_lock(&ci
->i_unsafe_lock
);
654 list_del_init(&req
->r_unsafe_dir_item
);
655 spin_unlock(&ci
->i_unsafe_lock
);
657 iput(req
->r_unsafe_dir
);
658 req
->r_unsafe_dir
= NULL
;
661 complete_all(&req
->r_safe_completion
);
663 ceph_mdsc_put_request(req
);
667 * Choose mds to send request to next. If there is a hint set in the
668 * request (e.g., due to a prior forward hint from the mds), use that.
669 * Otherwise, consult frag tree and/or caps to identify the
670 * appropriate mds. If all else fails, choose randomly.
672 * Called under mdsc->mutex.
674 static struct dentry
*get_nonsnap_parent(struct dentry
*dentry
)
677 * we don't need to worry about protecting the d_parent access
678 * here because we never renaming inside the snapped namespace
679 * except to resplice to another snapdir, and either the old or new
680 * result is a valid result.
682 while (!IS_ROOT(dentry
) && ceph_snap(d_inode(dentry
)) != CEPH_NOSNAP
)
683 dentry
= dentry
->d_parent
;
687 static int __choose_mds(struct ceph_mds_client
*mdsc
,
688 struct ceph_mds_request
*req
)
691 struct ceph_inode_info
*ci
;
692 struct ceph_cap
*cap
;
693 int mode
= req
->r_direct_mode
;
695 u32 hash
= req
->r_direct_hash
;
696 bool is_hash
= req
->r_direct_is_hash
;
699 * is there a specific mds we should try? ignore hint if we have
700 * no session and the mds is not up (active or recovering).
702 if (req
->r_resend_mds
>= 0 &&
703 (__have_session(mdsc
, req
->r_resend_mds
) ||
704 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
705 dout("choose_mds using resend_mds mds%d\n",
707 return req
->r_resend_mds
;
710 if (mode
== USE_RANDOM_MDS
)
715 inode
= req
->r_inode
;
716 } else if (req
->r_dentry
) {
717 /* ignore race with rename; old or new d_parent is okay */
718 struct dentry
*parent
= req
->r_dentry
->d_parent
;
719 struct inode
*dir
= d_inode(parent
);
721 if (dir
->i_sb
!= mdsc
->fsc
->sb
) {
723 inode
= d_inode(req
->r_dentry
);
724 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
725 /* direct snapped/virtual snapdir requests
726 * based on parent dir inode */
727 struct dentry
*dn
= get_nonsnap_parent(parent
);
729 dout("__choose_mds using nonsnap parent %p\n", inode
);
732 inode
= d_inode(req
->r_dentry
);
733 if (!inode
|| mode
== USE_AUTH_MDS
) {
736 hash
= ceph_dentry_hash(dir
, req
->r_dentry
);
742 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
746 ci
= ceph_inode(inode
);
748 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
749 struct ceph_inode_frag frag
;
752 ceph_choose_frag(ci
, hash
, &frag
, &found
);
754 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
757 /* choose a random replica */
758 get_random_bytes(&r
, 1);
761 dout("choose_mds %p %llx.%llx "
762 "frag %u mds%d (%d/%d)\n",
763 inode
, ceph_vinop(inode
),
766 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
767 CEPH_MDS_STATE_ACTIVE
)
771 /* since this file/dir wasn't known to be
772 * replicated, then we want to look for the
773 * authoritative mds. */
776 /* choose auth mds */
778 dout("choose_mds %p %llx.%llx "
779 "frag %u mds%d (auth)\n",
780 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
781 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
782 CEPH_MDS_STATE_ACTIVE
)
788 spin_lock(&ci
->i_ceph_lock
);
790 if (mode
== USE_AUTH_MDS
)
791 cap
= ci
->i_auth_cap
;
792 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
793 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
795 spin_unlock(&ci
->i_ceph_lock
);
798 mds
= cap
->session
->s_mds
;
799 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
800 inode
, ceph_vinop(inode
), mds
,
801 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
802 spin_unlock(&ci
->i_ceph_lock
);
806 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
807 dout("choose_mds chose random mds%d\n", mds
);
815 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
817 struct ceph_msg
*msg
;
818 struct ceph_mds_session_head
*h
;
820 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
,
823 pr_err("create_session_msg ENOMEM creating msg\n");
826 h
= msg
->front
.iov_base
;
827 h
->op
= cpu_to_le32(op
);
828 h
->seq
= cpu_to_le64(seq
);
834 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
835 * to include additional client metadata fields.
837 static struct ceph_msg
*create_session_open_msg(struct ceph_mds_client
*mdsc
, u64 seq
)
839 struct ceph_msg
*msg
;
840 struct ceph_mds_session_head
*h
;
842 int metadata_bytes
= 0;
843 int metadata_key_count
= 0;
844 struct ceph_options
*opt
= mdsc
->fsc
->client
->options
;
847 const char* metadata
[][2] = {
848 {"hostname", utsname()->nodename
},
849 {"kernel_version", utsname()->release
},
850 {"entity_id", opt
->name
? opt
->name
: ""},
854 /* Calculate serialized length of metadata */
855 metadata_bytes
= 4; /* map length */
856 for (i
= 0; metadata
[i
][0] != NULL
; ++i
) {
857 metadata_bytes
+= 8 + strlen(metadata
[i
][0]) +
858 strlen(metadata
[i
][1]);
859 metadata_key_count
++;
862 /* Allocate the message */
863 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
) + metadata_bytes
,
866 pr_err("create_session_msg ENOMEM creating msg\n");
869 h
= msg
->front
.iov_base
;
870 h
->op
= cpu_to_le32(CEPH_SESSION_REQUEST_OPEN
);
871 h
->seq
= cpu_to_le64(seq
);
874 * Serialize client metadata into waiting buffer space, using
875 * the format that userspace expects for map<string, string>
877 * ClientSession messages with metadata are v2
879 msg
->hdr
.version
= cpu_to_le16(2);
880 msg
->hdr
.compat_version
= cpu_to_le16(1);
882 /* The write pointer, following the session_head structure */
883 p
= msg
->front
.iov_base
+ sizeof(*h
);
885 /* Number of entries in the map */
886 ceph_encode_32(&p
, metadata_key_count
);
888 /* Two length-prefixed strings for each entry in the map */
889 for (i
= 0; metadata
[i
][0] != NULL
; ++i
) {
890 size_t const key_len
= strlen(metadata
[i
][0]);
891 size_t const val_len
= strlen(metadata
[i
][1]);
893 ceph_encode_32(&p
, key_len
);
894 memcpy(p
, metadata
[i
][0], key_len
);
896 ceph_encode_32(&p
, val_len
);
897 memcpy(p
, metadata
[i
][1], val_len
);
905 * send session open request.
907 * called under mdsc->mutex
909 static int __open_session(struct ceph_mds_client
*mdsc
,
910 struct ceph_mds_session
*session
)
912 struct ceph_msg
*msg
;
914 int mds
= session
->s_mds
;
916 /* wait for mds to go active? */
917 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
918 dout("open_session to mds%d (%s)\n", mds
,
919 ceph_mds_state_name(mstate
));
920 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
921 session
->s_renew_requested
= jiffies
;
923 /* send connect message */
924 msg
= create_session_open_msg(mdsc
, session
->s_seq
);
927 ceph_con_send(&session
->s_con
, msg
);
932 * open sessions for any export targets for the given mds
934 * called under mdsc->mutex
936 static struct ceph_mds_session
*
937 __open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
939 struct ceph_mds_session
*session
;
941 session
= __ceph_lookup_mds_session(mdsc
, target
);
943 session
= register_session(mdsc
, target
);
947 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
948 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
949 __open_session(mdsc
, session
);
954 struct ceph_mds_session
*
955 ceph_mdsc_open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
957 struct ceph_mds_session
*session
;
959 dout("open_export_target_session to mds%d\n", target
);
961 mutex_lock(&mdsc
->mutex
);
962 session
= __open_export_target_session(mdsc
, target
);
963 mutex_unlock(&mdsc
->mutex
);
968 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
969 struct ceph_mds_session
*session
)
971 struct ceph_mds_info
*mi
;
972 struct ceph_mds_session
*ts
;
973 int i
, mds
= session
->s_mds
;
975 if (mds
>= mdsc
->mdsmap
->m_max_mds
)
978 mi
= &mdsc
->mdsmap
->m_info
[mds
];
979 dout("open_export_target_sessions for mds%d (%d targets)\n",
980 session
->s_mds
, mi
->num_export_targets
);
982 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
983 ts
= __open_export_target_session(mdsc
, mi
->export_targets
[i
]);
985 ceph_put_mds_session(ts
);
989 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
990 struct ceph_mds_session
*session
)
992 mutex_lock(&mdsc
->mutex
);
993 __open_export_target_sessions(mdsc
, session
);
994 mutex_unlock(&mdsc
->mutex
);
1002 * Free preallocated cap messages assigned to this session
1004 static void cleanup_cap_releases(struct ceph_mds_session
*session
)
1006 struct ceph_msg
*msg
;
1008 spin_lock(&session
->s_cap_lock
);
1009 while (!list_empty(&session
->s_cap_releases
)) {
1010 msg
= list_first_entry(&session
->s_cap_releases
,
1011 struct ceph_msg
, list_head
);
1012 list_del_init(&msg
->list_head
);
1015 while (!list_empty(&session
->s_cap_releases_done
)) {
1016 msg
= list_first_entry(&session
->s_cap_releases_done
,
1017 struct ceph_msg
, list_head
);
1018 list_del_init(&msg
->list_head
);
1021 spin_unlock(&session
->s_cap_lock
);
1024 static void cleanup_session_requests(struct ceph_mds_client
*mdsc
,
1025 struct ceph_mds_session
*session
)
1027 struct ceph_mds_request
*req
;
1030 dout("cleanup_session_requests mds%d\n", session
->s_mds
);
1031 mutex_lock(&mdsc
->mutex
);
1032 while (!list_empty(&session
->s_unsafe
)) {
1033 req
= list_first_entry(&session
->s_unsafe
,
1034 struct ceph_mds_request
, r_unsafe_item
);
1035 list_del_init(&req
->r_unsafe_item
);
1036 pr_info(" dropping unsafe request %llu\n", req
->r_tid
);
1037 __unregister_request(mdsc
, req
);
1039 /* zero r_attempts, so kick_requests() will re-send requests */
1040 p
= rb_first(&mdsc
->request_tree
);
1042 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1044 if (req
->r_session
&&
1045 req
->r_session
->s_mds
== session
->s_mds
)
1046 req
->r_attempts
= 0;
1048 mutex_unlock(&mdsc
->mutex
);
1052 * Helper to safely iterate over all caps associated with a session, with
1053 * special care taken to handle a racing __ceph_remove_cap().
1055 * Caller must hold session s_mutex.
1057 static int iterate_session_caps(struct ceph_mds_session
*session
,
1058 int (*cb
)(struct inode
*, struct ceph_cap
*,
1061 struct list_head
*p
;
1062 struct ceph_cap
*cap
;
1063 struct inode
*inode
, *last_inode
= NULL
;
1064 struct ceph_cap
*old_cap
= NULL
;
1067 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
1068 spin_lock(&session
->s_cap_lock
);
1069 p
= session
->s_caps
.next
;
1070 while (p
!= &session
->s_caps
) {
1071 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
1072 inode
= igrab(&cap
->ci
->vfs_inode
);
1077 session
->s_cap_iterator
= cap
;
1078 spin_unlock(&session
->s_cap_lock
);
1085 ceph_put_cap(session
->s_mdsc
, old_cap
);
1089 ret
= cb(inode
, cap
, arg
);
1092 spin_lock(&session
->s_cap_lock
);
1094 if (cap
->ci
== NULL
) {
1095 dout("iterate_session_caps finishing cap %p removal\n",
1097 BUG_ON(cap
->session
!= session
);
1098 list_del_init(&cap
->session_caps
);
1099 session
->s_nr_caps
--;
1100 cap
->session
= NULL
;
1101 old_cap
= cap
; /* put_cap it w/o locks held */
1108 session
->s_cap_iterator
= NULL
;
1109 spin_unlock(&session
->s_cap_lock
);
1113 ceph_put_cap(session
->s_mdsc
, old_cap
);
1118 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1121 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1124 dout("removing cap %p, ci is %p, inode is %p\n",
1125 cap
, ci
, &ci
->vfs_inode
);
1126 spin_lock(&ci
->i_ceph_lock
);
1127 __ceph_remove_cap(cap
, false);
1128 if (!ci
->i_auth_cap
) {
1129 struct ceph_mds_client
*mdsc
=
1130 ceph_sb_to_client(inode
->i_sb
)->mdsc
;
1132 spin_lock(&mdsc
->cap_dirty_lock
);
1133 if (!list_empty(&ci
->i_dirty_item
)) {
1134 pr_info(" dropping dirty %s state for %p %lld\n",
1135 ceph_cap_string(ci
->i_dirty_caps
),
1136 inode
, ceph_ino(inode
));
1137 ci
->i_dirty_caps
= 0;
1138 list_del_init(&ci
->i_dirty_item
);
1141 if (!list_empty(&ci
->i_flushing_item
)) {
1142 pr_info(" dropping dirty+flushing %s state for %p %lld\n",
1143 ceph_cap_string(ci
->i_flushing_caps
),
1144 inode
, ceph_ino(inode
));
1145 ci
->i_flushing_caps
= 0;
1146 list_del_init(&ci
->i_flushing_item
);
1147 mdsc
->num_cap_flushing
--;
1150 spin_unlock(&mdsc
->cap_dirty_lock
);
1152 spin_unlock(&ci
->i_ceph_lock
);
1159 * caller must hold session s_mutex
1161 static void remove_session_caps(struct ceph_mds_session
*session
)
1163 dout("remove_session_caps on %p\n", session
);
1164 iterate_session_caps(session
, remove_session_caps_cb
, NULL
);
1166 spin_lock(&session
->s_cap_lock
);
1167 if (session
->s_nr_caps
> 0) {
1168 struct super_block
*sb
= session
->s_mdsc
->fsc
->sb
;
1169 struct inode
*inode
;
1170 struct ceph_cap
*cap
, *prev
= NULL
;
1171 struct ceph_vino vino
;
1173 * iterate_session_caps() skips inodes that are being
1174 * deleted, we need to wait until deletions are complete.
1175 * __wait_on_freeing_inode() is designed for the job,
1176 * but it is not exported, so use lookup inode function
1179 while (!list_empty(&session
->s_caps
)) {
1180 cap
= list_entry(session
->s_caps
.next
,
1181 struct ceph_cap
, session_caps
);
1185 vino
= cap
->ci
->i_vino
;
1186 spin_unlock(&session
->s_cap_lock
);
1188 inode
= ceph_find_inode(sb
, vino
);
1191 spin_lock(&session
->s_cap_lock
);
1194 spin_unlock(&session
->s_cap_lock
);
1196 BUG_ON(session
->s_nr_caps
> 0);
1197 BUG_ON(!list_empty(&session
->s_cap_flushing
));
1198 cleanup_cap_releases(session
);
1202 * wake up any threads waiting on this session's caps. if the cap is
1203 * old (didn't get renewed on the client reconnect), remove it now.
1205 * caller must hold s_mutex.
1207 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1210 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1212 wake_up_all(&ci
->i_cap_wq
);
1214 spin_lock(&ci
->i_ceph_lock
);
1215 ci
->i_wanted_max_size
= 0;
1216 ci
->i_requested_max_size
= 0;
1217 spin_unlock(&ci
->i_ceph_lock
);
1222 static void wake_up_session_caps(struct ceph_mds_session
*session
,
1225 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
1226 iterate_session_caps(session
, wake_up_session_cb
,
1227 (void *)(unsigned long)reconnect
);
1231 * Send periodic message to MDS renewing all currently held caps. The
1232 * ack will reset the expiration for all caps from this session.
1234 * caller holds s_mutex
1236 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
1237 struct ceph_mds_session
*session
)
1239 struct ceph_msg
*msg
;
1242 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
1243 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
1244 pr_info("mds%d caps stale\n", session
->s_mds
);
1245 session
->s_renew_requested
= jiffies
;
1247 /* do not try to renew caps until a recovering mds has reconnected
1248 * with its clients. */
1249 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
1250 if (state
< CEPH_MDS_STATE_RECONNECT
) {
1251 dout("send_renew_caps ignoring mds%d (%s)\n",
1252 session
->s_mds
, ceph_mds_state_name(state
));
1256 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
1257 ceph_mds_state_name(state
));
1258 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
1259 ++session
->s_renew_seq
);
1262 ceph_con_send(&session
->s_con
, msg
);
1266 static int send_flushmsg_ack(struct ceph_mds_client
*mdsc
,
1267 struct ceph_mds_session
*session
, u64 seq
)
1269 struct ceph_msg
*msg
;
1271 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1272 session
->s_mds
, ceph_session_state_name(session
->s_state
), seq
);
1273 msg
= create_session_msg(CEPH_SESSION_FLUSHMSG_ACK
, seq
);
1276 ceph_con_send(&session
->s_con
, msg
);
1282 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1284 * Called under session->s_mutex
1286 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1287 struct ceph_mds_session
*session
, int is_renew
)
1292 spin_lock(&session
->s_cap_lock
);
1293 was_stale
= is_renew
&& time_after_eq(jiffies
, session
->s_cap_ttl
);
1295 session
->s_cap_ttl
= session
->s_renew_requested
+
1296 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1299 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1300 pr_info("mds%d caps renewed\n", session
->s_mds
);
1303 pr_info("mds%d caps still stale\n", session
->s_mds
);
1306 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1307 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1308 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1309 spin_unlock(&session
->s_cap_lock
);
1312 wake_up_session_caps(session
, 0);
1316 * send a session close request
1318 static int request_close_session(struct ceph_mds_client
*mdsc
,
1319 struct ceph_mds_session
*session
)
1321 struct ceph_msg
*msg
;
1323 dout("request_close_session mds%d state %s seq %lld\n",
1324 session
->s_mds
, ceph_session_state_name(session
->s_state
),
1326 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1329 ceph_con_send(&session
->s_con
, msg
);
1334 * Called with s_mutex held.
1336 static int __close_session(struct ceph_mds_client
*mdsc
,
1337 struct ceph_mds_session
*session
)
1339 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1341 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1342 return request_close_session(mdsc
, session
);
1346 * Trim old(er) caps.
1348 * Because we can't cache an inode without one or more caps, we do
1349 * this indirectly: if a cap is unused, we prune its aliases, at which
1350 * point the inode will hopefully get dropped to.
1352 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1353 * memory pressure from the MDS, though, so it needn't be perfect.
1355 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1357 struct ceph_mds_session
*session
= arg
;
1358 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1359 int used
, wanted
, oissued
, mine
;
1361 if (session
->s_trim_caps
<= 0)
1364 spin_lock(&ci
->i_ceph_lock
);
1365 mine
= cap
->issued
| cap
->implemented
;
1366 used
= __ceph_caps_used(ci
);
1367 wanted
= __ceph_caps_file_wanted(ci
);
1368 oissued
= __ceph_caps_issued_other(ci
, cap
);
1370 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1371 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1372 ceph_cap_string(used
), ceph_cap_string(wanted
));
1373 if (cap
== ci
->i_auth_cap
) {
1374 if (ci
->i_dirty_caps
| ci
->i_flushing_caps
)
1376 if ((used
| wanted
) & CEPH_CAP_ANY_WR
)
1379 if ((used
| wanted
) & ~oissued
& mine
)
1380 goto out
; /* we need these caps */
1382 session
->s_trim_caps
--;
1384 /* we aren't the only cap.. just remove us */
1385 __ceph_remove_cap(cap
, true);
1387 /* try to drop referring dentries */
1388 spin_unlock(&ci
->i_ceph_lock
);
1389 d_prune_aliases(inode
);
1390 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1391 inode
, cap
, atomic_read(&inode
->i_count
));
1396 spin_unlock(&ci
->i_ceph_lock
);
1401 * Trim session cap count down to some max number.
1403 static int trim_caps(struct ceph_mds_client
*mdsc
,
1404 struct ceph_mds_session
*session
,
1407 int trim_caps
= session
->s_nr_caps
- max_caps
;
1409 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1410 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1411 if (trim_caps
> 0) {
1412 session
->s_trim_caps
= trim_caps
;
1413 iterate_session_caps(session
, trim_caps_cb
, session
);
1414 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1415 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1416 trim_caps
- session
->s_trim_caps
);
1417 session
->s_trim_caps
= 0;
1420 ceph_add_cap_releases(mdsc
, session
);
1421 ceph_send_cap_releases(mdsc
, session
);
1426 * Allocate cap_release messages. If there is a partially full message
1427 * in the queue, try to allocate enough to cover it's remainder, so that
1428 * we can send it immediately.
1430 * Called under s_mutex.
1432 int ceph_add_cap_releases(struct ceph_mds_client
*mdsc
,
1433 struct ceph_mds_session
*session
)
1435 struct ceph_msg
*msg
, *partial
= NULL
;
1436 struct ceph_mds_cap_release
*head
;
1438 int extra
= mdsc
->fsc
->mount_options
->cap_release_safety
;
1441 dout("add_cap_releases %p mds%d extra %d\n", session
, session
->s_mds
,
1444 spin_lock(&session
->s_cap_lock
);
1446 if (!list_empty(&session
->s_cap_releases
)) {
1447 msg
= list_first_entry(&session
->s_cap_releases
,
1450 head
= msg
->front
.iov_base
;
1451 num
= le32_to_cpu(head
->num
);
1453 dout(" partial %p with (%d/%d)\n", msg
, num
,
1454 (int)CEPH_CAPS_PER_RELEASE
);
1455 extra
+= CEPH_CAPS_PER_RELEASE
- num
;
1459 while (session
->s_num_cap_releases
< session
->s_nr_caps
+ extra
) {
1460 spin_unlock(&session
->s_cap_lock
);
1461 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
, PAGE_CACHE_SIZE
,
1465 dout("add_cap_releases %p msg %p now %d\n", session
, msg
,
1466 (int)msg
->front
.iov_len
);
1467 head
= msg
->front
.iov_base
;
1468 head
->num
= cpu_to_le32(0);
1469 msg
->front
.iov_len
= sizeof(*head
);
1470 spin_lock(&session
->s_cap_lock
);
1471 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1472 session
->s_num_cap_releases
+= CEPH_CAPS_PER_RELEASE
;
1476 head
= partial
->front
.iov_base
;
1477 num
= le32_to_cpu(head
->num
);
1478 dout(" queueing partial %p with %d/%d\n", partial
, num
,
1479 (int)CEPH_CAPS_PER_RELEASE
);
1480 list_move_tail(&partial
->list_head
,
1481 &session
->s_cap_releases_done
);
1482 session
->s_num_cap_releases
-= CEPH_CAPS_PER_RELEASE
- num
;
1485 spin_unlock(&session
->s_cap_lock
);
1490 static int check_cap_flush(struct inode
*inode
, u64 want_flush_seq
)
1492 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1494 spin_lock(&ci
->i_ceph_lock
);
1495 if (ci
->i_flushing_caps
)
1496 ret
= ci
->i_cap_flush_seq
>= want_flush_seq
;
1499 spin_unlock(&ci
->i_ceph_lock
);
1504 * flush all dirty inode data to disk.
1506 * returns true if we've flushed through want_flush_seq
1508 static void wait_caps_flush(struct ceph_mds_client
*mdsc
, u64 want_flush_seq
)
1512 dout("check_cap_flush want %lld\n", want_flush_seq
);
1513 mutex_lock(&mdsc
->mutex
);
1514 for (mds
= 0; mds
< mdsc
->max_sessions
; mds
++) {
1515 struct ceph_mds_session
*session
= mdsc
->sessions
[mds
];
1516 struct inode
*inode
= NULL
;
1520 get_session(session
);
1521 mutex_unlock(&mdsc
->mutex
);
1523 mutex_lock(&session
->s_mutex
);
1524 if (!list_empty(&session
->s_cap_flushing
)) {
1525 struct ceph_inode_info
*ci
=
1526 list_entry(session
->s_cap_flushing
.next
,
1527 struct ceph_inode_info
,
1530 if (!check_cap_flush(&ci
->vfs_inode
, want_flush_seq
)) {
1531 dout("check_cap_flush still flushing %p "
1532 "seq %lld <= %lld to mds%d\n",
1533 &ci
->vfs_inode
, ci
->i_cap_flush_seq
,
1534 want_flush_seq
, session
->s_mds
);
1535 inode
= igrab(&ci
->vfs_inode
);
1538 mutex_unlock(&session
->s_mutex
);
1539 ceph_put_mds_session(session
);
1542 wait_event(mdsc
->cap_flushing_wq
,
1543 check_cap_flush(inode
, want_flush_seq
));
1547 mutex_lock(&mdsc
->mutex
);
1550 mutex_unlock(&mdsc
->mutex
);
1551 dout("check_cap_flush ok, flushed thru %lld\n", want_flush_seq
);
1555 * called under s_mutex
1557 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1558 struct ceph_mds_session
*session
)
1560 struct ceph_msg
*msg
;
1562 dout("send_cap_releases mds%d\n", session
->s_mds
);
1563 spin_lock(&session
->s_cap_lock
);
1564 while (!list_empty(&session
->s_cap_releases_done
)) {
1565 msg
= list_first_entry(&session
->s_cap_releases_done
,
1566 struct ceph_msg
, list_head
);
1567 list_del_init(&msg
->list_head
);
1568 spin_unlock(&session
->s_cap_lock
);
1569 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1570 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1571 ceph_con_send(&session
->s_con
, msg
);
1572 spin_lock(&session
->s_cap_lock
);
1574 spin_unlock(&session
->s_cap_lock
);
1577 static void discard_cap_releases(struct ceph_mds_client
*mdsc
,
1578 struct ceph_mds_session
*session
)
1580 struct ceph_msg
*msg
;
1581 struct ceph_mds_cap_release
*head
;
1584 dout("discard_cap_releases mds%d\n", session
->s_mds
);
1586 if (!list_empty(&session
->s_cap_releases
)) {
1587 /* zero out the in-progress message */
1588 msg
= list_first_entry(&session
->s_cap_releases
,
1589 struct ceph_msg
, list_head
);
1590 head
= msg
->front
.iov_base
;
1591 num
= le32_to_cpu(head
->num
);
1592 dout("discard_cap_releases mds%d %p %u\n",
1593 session
->s_mds
, msg
, num
);
1594 head
->num
= cpu_to_le32(0);
1595 msg
->front
.iov_len
= sizeof(*head
);
1596 session
->s_num_cap_releases
+= num
;
1599 /* requeue completed messages */
1600 while (!list_empty(&session
->s_cap_releases_done
)) {
1601 msg
= list_first_entry(&session
->s_cap_releases_done
,
1602 struct ceph_msg
, list_head
);
1603 list_del_init(&msg
->list_head
);
1605 head
= msg
->front
.iov_base
;
1606 num
= le32_to_cpu(head
->num
);
1607 dout("discard_cap_releases mds%d %p %u\n", session
->s_mds
, msg
,
1609 session
->s_num_cap_releases
+= num
;
1610 head
->num
= cpu_to_le32(0);
1611 msg
->front
.iov_len
= sizeof(*head
);
1612 list_add(&msg
->list_head
, &session
->s_cap_releases
);
1620 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request
*req
,
1623 struct ceph_inode_info
*ci
= ceph_inode(dir
);
1624 struct ceph_mds_reply_info_parsed
*rinfo
= &req
->r_reply_info
;
1625 struct ceph_mount_options
*opt
= req
->r_mdsc
->fsc
->mount_options
;
1626 size_t size
= sizeof(*rinfo
->dir_in
) + sizeof(*rinfo
->dir_dname_len
) +
1627 sizeof(*rinfo
->dir_dname
) + sizeof(*rinfo
->dir_dlease
);
1628 int order
, num_entries
;
1630 spin_lock(&ci
->i_ceph_lock
);
1631 num_entries
= ci
->i_files
+ ci
->i_subdirs
;
1632 spin_unlock(&ci
->i_ceph_lock
);
1633 num_entries
= max(num_entries
, 1);
1634 num_entries
= min(num_entries
, opt
->max_readdir
);
1636 order
= get_order(size
* num_entries
);
1637 while (order
>= 0) {
1638 rinfo
->dir_in
= (void*)__get_free_pages(GFP_NOFS
| __GFP_NOWARN
,
1647 num_entries
= (PAGE_SIZE
<< order
) / size
;
1648 num_entries
= min(num_entries
, opt
->max_readdir
);
1650 rinfo
->dir_buf_size
= PAGE_SIZE
<< order
;
1651 req
->r_num_caps
= num_entries
+ 1;
1652 req
->r_args
.readdir
.max_entries
= cpu_to_le32(num_entries
);
1653 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(opt
->max_readdir_bytes
);
1658 * Create an mds request.
1660 struct ceph_mds_request
*
1661 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1663 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1666 return ERR_PTR(-ENOMEM
);
1668 mutex_init(&req
->r_fill_mutex
);
1670 req
->r_started
= jiffies
;
1671 req
->r_resend_mds
= -1;
1672 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1674 kref_init(&req
->r_kref
);
1675 INIT_LIST_HEAD(&req
->r_wait
);
1676 init_completion(&req
->r_completion
);
1677 init_completion(&req
->r_safe_completion
);
1678 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1680 req
->r_stamp
= CURRENT_TIME
;
1683 req
->r_direct_mode
= mode
;
1688 * return oldest (lowest) request, tid in request tree, 0 if none.
1690 * called under mdsc->mutex.
1692 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1694 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1696 return rb_entry(rb_first(&mdsc
->request_tree
),
1697 struct ceph_mds_request
, r_node
);
1700 static u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1702 struct ceph_mds_request
*req
= __get_oldest_req(mdsc
);
1710 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1711 * on build_path_from_dentry in fs/cifs/dir.c.
1713 * If @stop_on_nosnap, generate path relative to the first non-snapped
1716 * Encode hidden .snap dirs as a double /, i.e.
1717 * foo/.snap/bar -> foo//bar
1719 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1722 struct dentry
*temp
;
1728 return ERR_PTR(-EINVAL
);
1732 seq
= read_seqbegin(&rename_lock
);
1734 for (temp
= dentry
; !IS_ROOT(temp
);) {
1735 struct inode
*inode
= d_inode(temp
);
1736 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1737 len
++; /* slash only */
1738 else if (stop_on_nosnap
&& inode
&&
1739 ceph_snap(inode
) == CEPH_NOSNAP
)
1742 len
+= 1 + temp
->d_name
.len
;
1743 temp
= temp
->d_parent
;
1747 len
--; /* no leading '/' */
1749 path
= kmalloc(len
+1, GFP_NOFS
);
1751 return ERR_PTR(-ENOMEM
);
1753 path
[pos
] = 0; /* trailing null */
1755 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1756 struct inode
*inode
;
1758 spin_lock(&temp
->d_lock
);
1759 inode
= d_inode(temp
);
1760 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1761 dout("build_path path+%d: %p SNAPDIR\n",
1763 } else if (stop_on_nosnap
&& inode
&&
1764 ceph_snap(inode
) == CEPH_NOSNAP
) {
1765 spin_unlock(&temp
->d_lock
);
1768 pos
-= temp
->d_name
.len
;
1770 spin_unlock(&temp
->d_lock
);
1773 strncpy(path
+ pos
, temp
->d_name
.name
,
1776 spin_unlock(&temp
->d_lock
);
1779 temp
= temp
->d_parent
;
1782 if (pos
!= 0 || read_seqretry(&rename_lock
, seq
)) {
1783 pr_err("build_path did not end path lookup where "
1784 "expected, namelen is %d, pos is %d\n", len
, pos
);
1785 /* presumably this is only possible if racing with a
1786 rename of one of the parent directories (we can not
1787 lock the dentries above us to prevent this, but
1788 retrying should be harmless) */
1793 *base
= ceph_ino(d_inode(temp
));
1795 dout("build_path on %p %d built %llx '%.*s'\n",
1796 dentry
, d_count(dentry
), *base
, len
, path
);
1800 static int build_dentry_path(struct dentry
*dentry
,
1801 const char **ppath
, int *ppathlen
, u64
*pino
,
1806 if (ceph_snap(d_inode(dentry
->d_parent
)) == CEPH_NOSNAP
) {
1807 *pino
= ceph_ino(d_inode(dentry
->d_parent
));
1808 *ppath
= dentry
->d_name
.name
;
1809 *ppathlen
= dentry
->d_name
.len
;
1812 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1814 return PTR_ERR(path
);
1820 static int build_inode_path(struct inode
*inode
,
1821 const char **ppath
, int *ppathlen
, u64
*pino
,
1824 struct dentry
*dentry
;
1827 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1828 *pino
= ceph_ino(inode
);
1832 dentry
= d_find_alias(inode
);
1833 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1836 return PTR_ERR(path
);
1843 * request arguments may be specified via an inode *, a dentry *, or
1844 * an explicit ino+path.
1846 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1847 const char *rpath
, u64 rino
,
1848 const char **ppath
, int *pathlen
,
1849 u64
*ino
, int *freepath
)
1854 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1855 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1857 } else if (rdentry
) {
1858 r
= build_dentry_path(rdentry
, ppath
, pathlen
, ino
, freepath
);
1859 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1861 } else if (rpath
|| rino
) {
1864 *pathlen
= rpath
? strlen(rpath
) : 0;
1865 dout(" path %.*s\n", *pathlen
, rpath
);
1872 * called under mdsc->mutex
1874 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1875 struct ceph_mds_request
*req
,
1876 int mds
, bool drop_cap_releases
)
1878 struct ceph_msg
*msg
;
1879 struct ceph_mds_request_head
*head
;
1880 const char *path1
= NULL
;
1881 const char *path2
= NULL
;
1882 u64 ino1
= 0, ino2
= 0;
1883 int pathlen1
= 0, pathlen2
= 0;
1884 int freepath1
= 0, freepath2
= 0;
1890 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1891 req
->r_path1
, req
->r_ino1
.ino
,
1892 &path1
, &pathlen1
, &ino1
, &freepath1
);
1898 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1899 req
->r_path2
, req
->r_ino2
.ino
,
1900 &path2
, &pathlen2
, &ino2
, &freepath2
);
1906 len
= sizeof(*head
) +
1907 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
)) +
1908 sizeof(struct timespec
);
1910 /* calculate (max) length for cap releases */
1911 len
+= sizeof(struct ceph_mds_request_release
) *
1912 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1913 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1914 if (req
->r_dentry_drop
)
1915 len
+= req
->r_dentry
->d_name
.len
;
1916 if (req
->r_old_dentry_drop
)
1917 len
+= req
->r_old_dentry
->d_name
.len
;
1919 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
, false);
1921 msg
= ERR_PTR(-ENOMEM
);
1925 msg
->hdr
.version
= cpu_to_le16(2);
1926 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1928 head
= msg
->front
.iov_base
;
1929 p
= msg
->front
.iov_base
+ sizeof(*head
);
1930 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1932 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1933 head
->op
= cpu_to_le32(req
->r_op
);
1934 head
->caller_uid
= cpu_to_le32(from_kuid(&init_user_ns
, req
->r_uid
));
1935 head
->caller_gid
= cpu_to_le32(from_kgid(&init_user_ns
, req
->r_gid
));
1936 head
->args
= req
->r_args
;
1938 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1939 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1941 /* make note of release offset, in case we need to replay */
1942 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1946 if (req
->r_inode_drop
)
1947 releases
+= ceph_encode_inode_release(&p
,
1948 req
->r_inode
? req
->r_inode
: d_inode(req
->r_dentry
),
1949 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1950 if (req
->r_dentry_drop
)
1951 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1952 mds
, req
->r_dentry_drop
, req
->r_dentry_unless
);
1953 if (req
->r_old_dentry_drop
)
1954 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1955 mds
, req
->r_old_dentry_drop
, req
->r_old_dentry_unless
);
1956 if (req
->r_old_inode_drop
)
1957 releases
+= ceph_encode_inode_release(&p
,
1958 d_inode(req
->r_old_dentry
),
1959 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1961 if (drop_cap_releases
) {
1963 p
= msg
->front
.iov_base
+ req
->r_request_release_offset
;
1966 head
->num_releases
= cpu_to_le16(releases
);
1970 struct ceph_timespec ts
;
1971 ceph_encode_timespec(&ts
, &req
->r_stamp
);
1972 ceph_encode_copy(&p
, &ts
, sizeof(ts
));
1976 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
1977 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1979 if (req
->r_pagelist
) {
1980 struct ceph_pagelist
*pagelist
= req
->r_pagelist
;
1981 atomic_inc(&pagelist
->refcnt
);
1982 ceph_msg_data_add_pagelist(msg
, pagelist
);
1983 msg
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
1985 msg
->hdr
.data_len
= 0;
1988 msg
->hdr
.data_off
= cpu_to_le16(0);
1992 kfree((char *)path2
);
1995 kfree((char *)path1
);
2001 * called under mdsc->mutex if error, under no mutex if
2004 static void complete_request(struct ceph_mds_client
*mdsc
,
2005 struct ceph_mds_request
*req
)
2007 if (req
->r_callback
)
2008 req
->r_callback(mdsc
, req
);
2010 complete_all(&req
->r_completion
);
2014 * called under mdsc->mutex
2016 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
2017 struct ceph_mds_request
*req
,
2018 int mds
, bool drop_cap_releases
)
2020 struct ceph_mds_request_head
*rhead
;
2021 struct ceph_msg
*msg
;
2026 struct ceph_cap
*cap
=
2027 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
2030 req
->r_sent_on_mseq
= cap
->mseq
;
2032 req
->r_sent_on_mseq
= -1;
2034 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
2035 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
2037 if (req
->r_got_unsafe
) {
2040 * Replay. Do not regenerate message (and rebuild
2041 * paths, etc.); just use the original message.
2042 * Rebuilding paths will break for renames because
2043 * d_move mangles the src name.
2045 msg
= req
->r_request
;
2046 rhead
= msg
->front
.iov_base
;
2048 flags
= le32_to_cpu(rhead
->flags
);
2049 flags
|= CEPH_MDS_FLAG_REPLAY
;
2050 rhead
->flags
= cpu_to_le32(flags
);
2052 if (req
->r_target_inode
)
2053 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
2055 rhead
->num_retry
= req
->r_attempts
- 1;
2057 /* remove cap/dentry releases from message */
2058 rhead
->num_releases
= 0;
2061 p
= msg
->front
.iov_base
+ req
->r_request_release_offset
;
2063 struct ceph_timespec ts
;
2064 ceph_encode_timespec(&ts
, &req
->r_stamp
);
2065 ceph_encode_copy(&p
, &ts
, sizeof(ts
));
2068 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
2069 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
2073 if (req
->r_request
) {
2074 ceph_msg_put(req
->r_request
);
2075 req
->r_request
= NULL
;
2077 msg
= create_request_message(mdsc
, req
, mds
, drop_cap_releases
);
2079 req
->r_err
= PTR_ERR(msg
);
2080 complete_request(mdsc
, req
);
2081 return PTR_ERR(msg
);
2083 req
->r_request
= msg
;
2085 rhead
= msg
->front
.iov_base
;
2086 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
2087 if (req
->r_got_unsafe
)
2088 flags
|= CEPH_MDS_FLAG_REPLAY
;
2089 if (req
->r_locked_dir
)
2090 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
2091 rhead
->flags
= cpu_to_le32(flags
);
2092 rhead
->num_fwd
= req
->r_num_fwd
;
2093 rhead
->num_retry
= req
->r_attempts
- 1;
2096 dout(" r_locked_dir = %p\n", req
->r_locked_dir
);
2101 * send request, or put it on the appropriate wait list.
2103 static int __do_request(struct ceph_mds_client
*mdsc
,
2104 struct ceph_mds_request
*req
)
2106 struct ceph_mds_session
*session
= NULL
;
2110 if (req
->r_err
|| req
->r_got_result
) {
2112 __unregister_request(mdsc
, req
);
2116 if (req
->r_timeout
&&
2117 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
2118 dout("do_request timed out\n");
2123 put_request_session(req
);
2125 mds
= __choose_mds(mdsc
, req
);
2127 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
2128 dout("do_request no mds or not active, waiting for map\n");
2129 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
2133 /* get, open session */
2134 session
= __ceph_lookup_mds_session(mdsc
, mds
);
2136 session
= register_session(mdsc
, mds
);
2137 if (IS_ERR(session
)) {
2138 err
= PTR_ERR(session
);
2142 req
->r_session
= get_session(session
);
2144 dout("do_request mds%d session %p state %s\n", mds
, session
,
2145 ceph_session_state_name(session
->s_state
));
2146 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
2147 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
2148 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
2149 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
2150 __open_session(mdsc
, session
);
2151 list_add(&req
->r_wait
, &session
->s_waiting
);
2156 req
->r_resend_mds
= -1; /* forget any previous mds hint */
2158 if (req
->r_request_started
== 0) /* note request start time */
2159 req
->r_request_started
= jiffies
;
2161 err
= __prepare_send_request(mdsc
, req
, mds
, false);
2163 ceph_msg_get(req
->r_request
);
2164 ceph_con_send(&session
->s_con
, req
->r_request
);
2168 ceph_put_mds_session(session
);
2174 complete_request(mdsc
, req
);
2179 * called under mdsc->mutex
2181 static void __wake_requests(struct ceph_mds_client
*mdsc
,
2182 struct list_head
*head
)
2184 struct ceph_mds_request
*req
;
2185 LIST_HEAD(tmp_list
);
2187 list_splice_init(head
, &tmp_list
);
2189 while (!list_empty(&tmp_list
)) {
2190 req
= list_entry(tmp_list
.next
,
2191 struct ceph_mds_request
, r_wait
);
2192 list_del_init(&req
->r_wait
);
2193 dout(" wake request %p tid %llu\n", req
, req
->r_tid
);
2194 __do_request(mdsc
, req
);
2199 * Wake up threads with requests pending for @mds, so that they can
2200 * resubmit their requests to a possibly different mds.
2202 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
2204 struct ceph_mds_request
*req
;
2205 struct rb_node
*p
= rb_first(&mdsc
->request_tree
);
2207 dout("kick_requests mds%d\n", mds
);
2209 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
2211 if (req
->r_got_unsafe
)
2213 if (req
->r_attempts
> 0)
2214 continue; /* only new requests */
2215 if (req
->r_session
&&
2216 req
->r_session
->s_mds
== mds
) {
2217 dout(" kicking tid %llu\n", req
->r_tid
);
2218 list_del_init(&req
->r_wait
);
2219 __do_request(mdsc
, req
);
2224 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
2225 struct ceph_mds_request
*req
)
2227 dout("submit_request on %p\n", req
);
2228 mutex_lock(&mdsc
->mutex
);
2229 __register_request(mdsc
, req
, NULL
);
2230 __do_request(mdsc
, req
);
2231 mutex_unlock(&mdsc
->mutex
);
2235 * Synchrously perform an mds request. Take care of all of the
2236 * session setup, forwarding, retry details.
2238 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
2240 struct ceph_mds_request
*req
)
2244 dout("do_request on %p\n", req
);
2246 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2248 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
2249 if (req
->r_locked_dir
)
2250 ceph_get_cap_refs(ceph_inode(req
->r_locked_dir
), CEPH_CAP_PIN
);
2251 if (req
->r_old_dentry_dir
)
2252 ceph_get_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
2256 mutex_lock(&mdsc
->mutex
);
2257 __register_request(mdsc
, req
, dir
);
2258 __do_request(mdsc
, req
);
2262 __unregister_request(mdsc
, req
);
2263 dout("do_request early error %d\n", err
);
2268 mutex_unlock(&mdsc
->mutex
);
2269 dout("do_request waiting\n");
2270 if (req
->r_timeout
) {
2271 err
= (long)wait_for_completion_killable_timeout(
2272 &req
->r_completion
, req
->r_timeout
);
2275 } else if (req
->r_wait_for_completion
) {
2276 err
= req
->r_wait_for_completion(mdsc
, req
);
2278 err
= wait_for_completion_killable(&req
->r_completion
);
2280 dout("do_request waited, got %d\n", err
);
2281 mutex_lock(&mdsc
->mutex
);
2283 /* only abort if we didn't race with a real reply */
2284 if (req
->r_got_result
) {
2285 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
2286 } else if (err
< 0) {
2287 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
2290 * ensure we aren't running concurrently with
2291 * ceph_fill_trace or ceph_readdir_prepopulate, which
2292 * rely on locks (dir mutex) held by our caller.
2294 mutex_lock(&req
->r_fill_mutex
);
2296 req
->r_aborted
= true;
2297 mutex_unlock(&req
->r_fill_mutex
);
2299 if (req
->r_locked_dir
&&
2300 (req
->r_op
& CEPH_MDS_OP_WRITE
))
2301 ceph_invalidate_dir_request(req
);
2307 mutex_unlock(&mdsc
->mutex
);
2308 dout("do_request %p done, result %d\n", req
, err
);
2313 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2314 * namespace request.
2316 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
2318 struct inode
*inode
= req
->r_locked_dir
;
2320 dout("invalidate_dir_request %p (complete, lease(s))\n", inode
);
2322 ceph_dir_clear_complete(inode
);
2324 ceph_invalidate_dentry_lease(req
->r_dentry
);
2325 if (req
->r_old_dentry
)
2326 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
2332 * We take the session mutex and parse and process the reply immediately.
2333 * This preserves the logical ordering of replies, capabilities, etc., sent
2334 * by the MDS as they are applied to our local cache.
2336 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
2338 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2339 struct ceph_mds_request
*req
;
2340 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
2341 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
2342 struct ceph_snap_realm
*realm
;
2345 int mds
= session
->s_mds
;
2347 if (msg
->front
.iov_len
< sizeof(*head
)) {
2348 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2353 /* get request, session */
2354 tid
= le64_to_cpu(msg
->hdr
.tid
);
2355 mutex_lock(&mdsc
->mutex
);
2356 req
= __lookup_request(mdsc
, tid
);
2358 dout("handle_reply on unknown tid %llu\n", tid
);
2359 mutex_unlock(&mdsc
->mutex
);
2362 dout("handle_reply %p\n", req
);
2364 /* correct session? */
2365 if (req
->r_session
!= session
) {
2366 pr_err("mdsc_handle_reply got %llu on session mds%d"
2367 " not mds%d\n", tid
, session
->s_mds
,
2368 req
->r_session
? req
->r_session
->s_mds
: -1);
2369 mutex_unlock(&mdsc
->mutex
);
2374 if ((req
->r_got_unsafe
&& !head
->safe
) ||
2375 (req
->r_got_safe
&& head
->safe
)) {
2376 pr_warn("got a dup %s reply on %llu from mds%d\n",
2377 head
->safe
? "safe" : "unsafe", tid
, mds
);
2378 mutex_unlock(&mdsc
->mutex
);
2381 if (req
->r_got_safe
&& !head
->safe
) {
2382 pr_warn("got unsafe after safe on %llu from mds%d\n",
2384 mutex_unlock(&mdsc
->mutex
);
2388 result
= le32_to_cpu(head
->result
);
2392 * if we're not talking to the authority, send to them
2393 * if the authority has changed while we weren't looking,
2394 * send to new authority
2395 * Otherwise we just have to return an ESTALE
2397 if (result
== -ESTALE
) {
2398 dout("got ESTALE on request %llu", req
->r_tid
);
2399 req
->r_resend_mds
= -1;
2400 if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2401 dout("not using auth, setting for that now");
2402 req
->r_direct_mode
= USE_AUTH_MDS
;
2403 __do_request(mdsc
, req
);
2404 mutex_unlock(&mdsc
->mutex
);
2407 int mds
= __choose_mds(mdsc
, req
);
2408 if (mds
>= 0 && mds
!= req
->r_session
->s_mds
) {
2409 dout("but auth changed, so resending");
2410 __do_request(mdsc
, req
);
2411 mutex_unlock(&mdsc
->mutex
);
2415 dout("have to return ESTALE on request %llu", req
->r_tid
);
2420 req
->r_got_safe
= true;
2421 __unregister_request(mdsc
, req
);
2423 if (req
->r_got_unsafe
) {
2425 * We already handled the unsafe response, now do the
2426 * cleanup. No need to examine the response; the MDS
2427 * doesn't include any result info in the safe
2428 * response. And even if it did, there is nothing
2429 * useful we could do with a revised return value.
2431 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2432 list_del_init(&req
->r_unsafe_item
);
2434 /* last unsafe request during umount? */
2435 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2436 complete_all(&mdsc
->safe_umount_waiters
);
2437 mutex_unlock(&mdsc
->mutex
);
2441 req
->r_got_unsafe
= true;
2442 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2445 dout("handle_reply tid %lld result %d\n", tid
, result
);
2446 rinfo
= &req
->r_reply_info
;
2447 err
= parse_reply_info(msg
, rinfo
, session
->s_con
.peer_features
);
2448 mutex_unlock(&mdsc
->mutex
);
2450 mutex_lock(&session
->s_mutex
);
2452 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds
, tid
);
2459 if (rinfo
->snapblob_len
) {
2460 down_write(&mdsc
->snap_rwsem
);
2461 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2462 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2463 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
,
2465 downgrade_write(&mdsc
->snap_rwsem
);
2467 down_read(&mdsc
->snap_rwsem
);
2470 /* insert trace into our cache */
2471 mutex_lock(&req
->r_fill_mutex
);
2472 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
, req
->r_session
);
2474 if (result
== 0 && (req
->r_op
== CEPH_MDS_OP_READDIR
||
2475 req
->r_op
== CEPH_MDS_OP_LSSNAP
))
2476 ceph_readdir_prepopulate(req
, req
->r_session
);
2477 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2479 mutex_unlock(&req
->r_fill_mutex
);
2481 up_read(&mdsc
->snap_rwsem
);
2483 ceph_put_snap_realm(mdsc
, realm
);
2485 mutex_lock(&mdsc
->mutex
);
2486 if (!req
->r_aborted
) {
2492 req
->r_got_result
= true;
2495 dout("reply arrived after request %lld was aborted\n", tid
);
2497 mutex_unlock(&mdsc
->mutex
);
2499 ceph_add_cap_releases(mdsc
, req
->r_session
);
2500 mutex_unlock(&session
->s_mutex
);
2502 /* kick calling process */
2503 complete_request(mdsc
, req
);
2505 ceph_mdsc_put_request(req
);
2512 * handle mds notification that our request has been forwarded.
2514 static void handle_forward(struct ceph_mds_client
*mdsc
,
2515 struct ceph_mds_session
*session
,
2516 struct ceph_msg
*msg
)
2518 struct ceph_mds_request
*req
;
2519 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2523 void *p
= msg
->front
.iov_base
;
2524 void *end
= p
+ msg
->front
.iov_len
;
2526 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2527 next_mds
= ceph_decode_32(&p
);
2528 fwd_seq
= ceph_decode_32(&p
);
2530 mutex_lock(&mdsc
->mutex
);
2531 req
= __lookup_request(mdsc
, tid
);
2533 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2534 goto out
; /* dup reply? */
2537 if (req
->r_aborted
) {
2538 dout("forward tid %llu aborted, unregistering\n", tid
);
2539 __unregister_request(mdsc
, req
);
2540 } else if (fwd_seq
<= req
->r_num_fwd
) {
2541 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2542 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2544 /* resend. forward race not possible; mds would drop */
2545 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2547 BUG_ON(req
->r_got_result
);
2548 req
->r_attempts
= 0;
2549 req
->r_num_fwd
= fwd_seq
;
2550 req
->r_resend_mds
= next_mds
;
2551 put_request_session(req
);
2552 __do_request(mdsc
, req
);
2554 ceph_mdsc_put_request(req
);
2556 mutex_unlock(&mdsc
->mutex
);
2560 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2564 * handle a mds session control message
2566 static void handle_session(struct ceph_mds_session
*session
,
2567 struct ceph_msg
*msg
)
2569 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2572 int mds
= session
->s_mds
;
2573 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2577 if (msg
->front
.iov_len
!= sizeof(*h
))
2579 op
= le32_to_cpu(h
->op
);
2580 seq
= le64_to_cpu(h
->seq
);
2582 mutex_lock(&mdsc
->mutex
);
2583 if (op
== CEPH_SESSION_CLOSE
)
2584 __unregister_session(mdsc
, session
);
2585 /* FIXME: this ttl calculation is generous */
2586 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2587 mutex_unlock(&mdsc
->mutex
);
2589 mutex_lock(&session
->s_mutex
);
2591 dout("handle_session mds%d %s %p state %s seq %llu\n",
2592 mds
, ceph_session_op_name(op
), session
,
2593 ceph_session_state_name(session
->s_state
), seq
);
2595 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2596 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2597 pr_info("mds%d came back\n", session
->s_mds
);
2601 case CEPH_SESSION_OPEN
:
2602 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2603 pr_info("mds%d reconnect success\n", session
->s_mds
);
2604 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2605 renewed_caps(mdsc
, session
, 0);
2608 __close_session(mdsc
, session
);
2611 case CEPH_SESSION_RENEWCAPS
:
2612 if (session
->s_renew_seq
== seq
)
2613 renewed_caps(mdsc
, session
, 1);
2616 case CEPH_SESSION_CLOSE
:
2617 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2618 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2619 cleanup_session_requests(mdsc
, session
);
2620 remove_session_caps(session
);
2621 wake
= 2; /* for good measure */
2622 wake_up_all(&mdsc
->session_close_wq
);
2625 case CEPH_SESSION_STALE
:
2626 pr_info("mds%d caps went stale, renewing\n",
2628 spin_lock(&session
->s_gen_ttl_lock
);
2629 session
->s_cap_gen
++;
2630 session
->s_cap_ttl
= jiffies
- 1;
2631 spin_unlock(&session
->s_gen_ttl_lock
);
2632 send_renew_caps(mdsc
, session
);
2635 case CEPH_SESSION_RECALL_STATE
:
2636 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2639 case CEPH_SESSION_FLUSHMSG
:
2640 send_flushmsg_ack(mdsc
, session
, seq
);
2643 case CEPH_SESSION_FORCE_RO
:
2644 dout("force_session_readonly %p\n", session
);
2645 spin_lock(&session
->s_cap_lock
);
2646 session
->s_readonly
= true;
2647 spin_unlock(&session
->s_cap_lock
);
2648 wake_up_session_caps(session
, 0);
2652 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2656 mutex_unlock(&session
->s_mutex
);
2658 mutex_lock(&mdsc
->mutex
);
2659 __wake_requests(mdsc
, &session
->s_waiting
);
2661 kick_requests(mdsc
, mds
);
2662 mutex_unlock(&mdsc
->mutex
);
2667 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2668 (int)msg
->front
.iov_len
);
2675 * called under session->mutex.
2677 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2678 struct ceph_mds_session
*session
)
2680 struct ceph_mds_request
*req
, *nreq
;
2684 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2686 mutex_lock(&mdsc
->mutex
);
2687 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2688 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
, true);
2690 ceph_msg_get(req
->r_request
);
2691 ceph_con_send(&session
->s_con
, req
->r_request
);
2696 * also re-send old requests when MDS enters reconnect stage. So that MDS
2697 * can process completed request in clientreplay stage.
2699 p
= rb_first(&mdsc
->request_tree
);
2701 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
2703 if (req
->r_got_unsafe
)
2705 if (req
->r_attempts
== 0)
2706 continue; /* only old requests */
2707 if (req
->r_session
&&
2708 req
->r_session
->s_mds
== session
->s_mds
) {
2709 err
= __prepare_send_request(mdsc
, req
,
2710 session
->s_mds
, true);
2712 ceph_msg_get(req
->r_request
);
2713 ceph_con_send(&session
->s_con
, req
->r_request
);
2717 mutex_unlock(&mdsc
->mutex
);
2721 * Encode information about a cap for a reconnect with the MDS.
2723 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2727 struct ceph_mds_cap_reconnect v2
;
2728 struct ceph_mds_cap_reconnect_v1 v1
;
2731 struct ceph_inode_info
*ci
;
2732 struct ceph_reconnect_state
*recon_state
= arg
;
2733 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2737 struct dentry
*dentry
;
2741 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2742 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2743 ceph_cap_string(cap
->issued
));
2744 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2748 dentry
= d_find_alias(inode
);
2750 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2752 err
= PTR_ERR(path
);
2759 err
= ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2763 spin_lock(&ci
->i_ceph_lock
);
2764 cap
->seq
= 0; /* reset cap seq */
2765 cap
->issue_seq
= 0; /* and issue_seq */
2766 cap
->mseq
= 0; /* and migrate_seq */
2767 cap
->cap_gen
= cap
->session
->s_cap_gen
;
2769 if (recon_state
->flock
) {
2770 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2771 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2772 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2773 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2774 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2775 rec
.v2
.flock_len
= 0;
2776 reclen
= sizeof(rec
.v2
);
2778 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2779 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2780 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2781 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2782 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2783 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2784 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2785 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2786 reclen
= sizeof(rec
.v1
);
2788 spin_unlock(&ci
->i_ceph_lock
);
2790 if (recon_state
->flock
) {
2791 int num_fcntl_locks
, num_flock_locks
;
2792 struct ceph_filelock
*flocks
;
2795 ceph_count_locks(inode
, &num_fcntl_locks
, &num_flock_locks
);
2796 flocks
= kmalloc((num_fcntl_locks
+num_flock_locks
) *
2797 sizeof(struct ceph_filelock
), GFP_NOFS
);
2802 err
= ceph_encode_locks_to_buffer(inode
, flocks
,
2812 * number of encoded locks is stable, so copy to pagelist
2814 rec
.v2
.flock_len
= cpu_to_le32(2*sizeof(u32
) +
2815 (num_fcntl_locks
+num_flock_locks
) *
2816 sizeof(struct ceph_filelock
));
2817 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2819 err
= ceph_locks_to_pagelist(flocks
, pagelist
,
2824 err
= ceph_pagelist_append(pagelist
, &rec
, reclen
);
2827 recon_state
->nr_caps
++;
2837 * If an MDS fails and recovers, clients need to reconnect in order to
2838 * reestablish shared state. This includes all caps issued through
2839 * this session _and_ the snap_realm hierarchy. Because it's not
2840 * clear which snap realms the mds cares about, we send everything we
2841 * know about.. that ensures we'll then get any new info the
2842 * recovering MDS might have.
2844 * This is a relatively heavyweight operation, but it's rare.
2846 * called with mdsc->mutex held.
2848 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2849 struct ceph_mds_session
*session
)
2851 struct ceph_msg
*reply
;
2853 int mds
= session
->s_mds
;
2856 struct ceph_pagelist
*pagelist
;
2857 struct ceph_reconnect_state recon_state
;
2859 pr_info("mds%d reconnect start\n", mds
);
2861 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2863 goto fail_nopagelist
;
2864 ceph_pagelist_init(pagelist
);
2866 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
, false);
2870 mutex_lock(&session
->s_mutex
);
2871 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
2874 dout("session %p state %s\n", session
,
2875 ceph_session_state_name(session
->s_state
));
2877 spin_lock(&session
->s_gen_ttl_lock
);
2878 session
->s_cap_gen
++;
2879 spin_unlock(&session
->s_gen_ttl_lock
);
2881 spin_lock(&session
->s_cap_lock
);
2882 /* don't know if session is readonly */
2883 session
->s_readonly
= 0;
2885 * notify __ceph_remove_cap() that we are composing cap reconnect.
2886 * If a cap get released before being added to the cap reconnect,
2887 * __ceph_remove_cap() should skip queuing cap release.
2889 session
->s_cap_reconnect
= 1;
2890 /* drop old cap expires; we're about to reestablish that state */
2891 discard_cap_releases(mdsc
, session
);
2892 spin_unlock(&session
->s_cap_lock
);
2894 /* trim unused caps to reduce MDS's cache rejoin time */
2895 if (mdsc
->fsc
->sb
->s_root
)
2896 shrink_dcache_parent(mdsc
->fsc
->sb
->s_root
);
2898 ceph_con_close(&session
->s_con
);
2899 ceph_con_open(&session
->s_con
,
2900 CEPH_ENTITY_TYPE_MDS
, mds
,
2901 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
2903 /* replay unsafe requests */
2904 replay_unsafe_requests(mdsc
, session
);
2906 down_read(&mdsc
->snap_rwsem
);
2908 /* traverse this session's caps */
2909 s_nr_caps
= session
->s_nr_caps
;
2910 err
= ceph_pagelist_encode_32(pagelist
, s_nr_caps
);
2914 recon_state
.nr_caps
= 0;
2915 recon_state
.pagelist
= pagelist
;
2916 recon_state
.flock
= session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
;
2917 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
2921 spin_lock(&session
->s_cap_lock
);
2922 session
->s_cap_reconnect
= 0;
2923 spin_unlock(&session
->s_cap_lock
);
2926 * snaprealms. we provide mds with the ino, seq (version), and
2927 * parent for all of our realms. If the mds has any newer info,
2930 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
2931 struct ceph_snap_realm
*realm
=
2932 rb_entry(p
, struct ceph_snap_realm
, node
);
2933 struct ceph_mds_snaprealm_reconnect sr_rec
;
2935 dout(" adding snap realm %llx seq %lld parent %llx\n",
2936 realm
->ino
, realm
->seq
, realm
->parent_ino
);
2937 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
2938 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
2939 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
2940 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
2945 if (recon_state
.flock
)
2946 reply
->hdr
.version
= cpu_to_le16(2);
2948 /* raced with cap release? */
2949 if (s_nr_caps
!= recon_state
.nr_caps
) {
2950 struct page
*page
= list_first_entry(&pagelist
->head
,
2952 __le32
*addr
= kmap_atomic(page
);
2953 *addr
= cpu_to_le32(recon_state
.nr_caps
);
2954 kunmap_atomic(addr
);
2957 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2958 ceph_msg_data_add_pagelist(reply
, pagelist
);
2959 ceph_con_send(&session
->s_con
, reply
);
2961 mutex_unlock(&session
->s_mutex
);
2963 mutex_lock(&mdsc
->mutex
);
2964 __wake_requests(mdsc
, &session
->s_waiting
);
2965 mutex_unlock(&mdsc
->mutex
);
2967 up_read(&mdsc
->snap_rwsem
);
2971 ceph_msg_put(reply
);
2972 up_read(&mdsc
->snap_rwsem
);
2973 mutex_unlock(&session
->s_mutex
);
2975 ceph_pagelist_release(pagelist
);
2977 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
2983 * compare old and new mdsmaps, kicking requests
2984 * and closing out old connections as necessary
2986 * called under mdsc->mutex.
2988 static void check_new_map(struct ceph_mds_client
*mdsc
,
2989 struct ceph_mdsmap
*newmap
,
2990 struct ceph_mdsmap
*oldmap
)
2993 int oldstate
, newstate
;
2994 struct ceph_mds_session
*s
;
2996 dout("check_new_map new %u old %u\n",
2997 newmap
->m_epoch
, oldmap
->m_epoch
);
2999 for (i
= 0; i
< oldmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
3000 if (mdsc
->sessions
[i
] == NULL
)
3002 s
= mdsc
->sessions
[i
];
3003 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
3004 newstate
= ceph_mdsmap_get_state(newmap
, i
);
3006 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3007 i
, ceph_mds_state_name(oldstate
),
3008 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
3009 ceph_mds_state_name(newstate
),
3010 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
3011 ceph_session_state_name(s
->s_state
));
3013 if (i
>= newmap
->m_max_mds
||
3014 memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
3015 ceph_mdsmap_get_addr(newmap
, i
),
3016 sizeof(struct ceph_entity_addr
))) {
3017 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
3018 /* the session never opened, just close it
3020 __wake_requests(mdsc
, &s
->s_waiting
);
3021 __unregister_session(mdsc
, s
);
3024 mutex_unlock(&mdsc
->mutex
);
3025 mutex_lock(&s
->s_mutex
);
3026 mutex_lock(&mdsc
->mutex
);
3027 ceph_con_close(&s
->s_con
);
3028 mutex_unlock(&s
->s_mutex
);
3029 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
3031 } else if (oldstate
== newstate
) {
3032 continue; /* nothing new with this mds */
3038 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
3039 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
3040 mutex_unlock(&mdsc
->mutex
);
3041 send_mds_reconnect(mdsc
, s
);
3042 mutex_lock(&mdsc
->mutex
);
3046 * kick request on any mds that has gone active.
3048 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
3049 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
3050 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
3051 oldstate
!= CEPH_MDS_STATE_STARTING
)
3052 pr_info("mds%d recovery completed\n", s
->s_mds
);
3053 kick_requests(mdsc
, i
);
3054 ceph_kick_flushing_caps(mdsc
, s
);
3055 wake_up_session_caps(s
, 1);
3059 for (i
= 0; i
< newmap
->m_max_mds
&& i
< mdsc
->max_sessions
; i
++) {
3060 s
= mdsc
->sessions
[i
];
3063 if (!ceph_mdsmap_is_laggy(newmap
, i
))
3065 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3066 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
3067 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3068 dout(" connecting to export targets of laggy mds%d\n",
3070 __open_export_target_sessions(mdsc
, s
);
3082 * caller must hold session s_mutex, dentry->d_lock
3084 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
3086 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
3088 ceph_put_mds_session(di
->lease_session
);
3089 di
->lease_session
= NULL
;
3092 static void handle_lease(struct ceph_mds_client
*mdsc
,
3093 struct ceph_mds_session
*session
,
3094 struct ceph_msg
*msg
)
3096 struct super_block
*sb
= mdsc
->fsc
->sb
;
3097 struct inode
*inode
;
3098 struct dentry
*parent
, *dentry
;
3099 struct ceph_dentry_info
*di
;
3100 int mds
= session
->s_mds
;
3101 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
3103 struct ceph_vino vino
;
3107 dout("handle_lease from mds%d\n", mds
);
3110 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
3112 vino
.ino
= le64_to_cpu(h
->ino
);
3113 vino
.snap
= CEPH_NOSNAP
;
3114 seq
= le32_to_cpu(h
->seq
);
3115 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
3116 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
3117 if (dname
.len
!= get_unaligned_le32(h
+1))
3121 inode
= ceph_find_inode(sb
, vino
);
3122 dout("handle_lease %s, ino %llx %p %.*s\n",
3123 ceph_lease_op_name(h
->action
), vino
.ino
, inode
,
3124 dname
.len
, dname
.name
);
3126 mutex_lock(&session
->s_mutex
);
3129 if (inode
== NULL
) {
3130 dout("handle_lease no inode %llx\n", vino
.ino
);
3135 parent
= d_find_alias(inode
);
3137 dout("no parent dentry on inode %p\n", inode
);
3139 goto release
; /* hrm... */
3141 dname
.hash
= full_name_hash(dname
.name
, dname
.len
);
3142 dentry
= d_lookup(parent
, &dname
);
3147 spin_lock(&dentry
->d_lock
);
3148 di
= ceph_dentry(dentry
);
3149 switch (h
->action
) {
3150 case CEPH_MDS_LEASE_REVOKE
:
3151 if (di
->lease_session
== session
) {
3152 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
3153 h
->seq
= cpu_to_le32(di
->lease_seq
);
3154 __ceph_mdsc_drop_dentry_lease(dentry
);
3159 case CEPH_MDS_LEASE_RENEW
:
3160 if (di
->lease_session
== session
&&
3161 di
->lease_gen
== session
->s_cap_gen
&&
3162 di
->lease_renew_from
&&
3163 di
->lease_renew_after
== 0) {
3164 unsigned long duration
=
3165 msecs_to_jiffies(le32_to_cpu(h
->duration_ms
));
3167 di
->lease_seq
= seq
;
3168 dentry
->d_time
= di
->lease_renew_from
+ duration
;
3169 di
->lease_renew_after
= di
->lease_renew_from
+
3171 di
->lease_renew_from
= 0;
3175 spin_unlock(&dentry
->d_lock
);
3182 /* let's just reuse the same message */
3183 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
3185 ceph_con_send(&session
->s_con
, msg
);
3189 mutex_unlock(&session
->s_mutex
);
3193 pr_err("corrupt lease message\n");
3197 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
3198 struct inode
*inode
,
3199 struct dentry
*dentry
, char action
,
3202 struct ceph_msg
*msg
;
3203 struct ceph_mds_lease
*lease
;
3204 int len
= sizeof(*lease
) + sizeof(u32
);
3207 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3208 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
3209 dnamelen
= dentry
->d_name
.len
;
3212 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
, false);
3215 lease
= msg
->front
.iov_base
;
3216 lease
->action
= action
;
3217 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
3218 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
3219 lease
->seq
= cpu_to_le32(seq
);
3220 put_unaligned_le32(dnamelen
, lease
+ 1);
3221 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
3224 * if this is a preemptive lease RELEASE, no need to
3225 * flush request stream, since the actual request will
3228 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
3230 ceph_con_send(&session
->s_con
, msg
);
3234 * Preemptively release a lease we expect to invalidate anyway.
3235 * Pass @inode always, @dentry is optional.
3237 void ceph_mdsc_lease_release(struct ceph_mds_client
*mdsc
, struct inode
*inode
,
3238 struct dentry
*dentry
)
3240 struct ceph_dentry_info
*di
;
3241 struct ceph_mds_session
*session
;
3244 BUG_ON(inode
== NULL
);
3245 BUG_ON(dentry
== NULL
);
3247 /* is dentry lease valid? */
3248 spin_lock(&dentry
->d_lock
);
3249 di
= ceph_dentry(dentry
);
3250 if (!di
|| !di
->lease_session
||
3251 di
->lease_session
->s_mds
< 0 ||
3252 di
->lease_gen
!= di
->lease_session
->s_cap_gen
||
3253 !time_before(jiffies
, dentry
->d_time
)) {
3254 dout("lease_release inode %p dentry %p -- "
3257 spin_unlock(&dentry
->d_lock
);
3261 /* we do have a lease on this dentry; note mds and seq */
3262 session
= ceph_get_mds_session(di
->lease_session
);
3263 seq
= di
->lease_seq
;
3264 __ceph_mdsc_drop_dentry_lease(dentry
);
3265 spin_unlock(&dentry
->d_lock
);
3267 dout("lease_release inode %p dentry %p to mds%d\n",
3268 inode
, dentry
, session
->s_mds
);
3269 ceph_mdsc_lease_send_msg(session
, inode
, dentry
,
3270 CEPH_MDS_LEASE_RELEASE
, seq
);
3271 ceph_put_mds_session(session
);
3275 * drop all leases (and dentry refs) in preparation for umount
3277 static void drop_leases(struct ceph_mds_client
*mdsc
)
3281 dout("drop_leases\n");
3282 mutex_lock(&mdsc
->mutex
);
3283 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3284 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3287 mutex_unlock(&mdsc
->mutex
);
3288 mutex_lock(&s
->s_mutex
);
3289 mutex_unlock(&s
->s_mutex
);
3290 ceph_put_mds_session(s
);
3291 mutex_lock(&mdsc
->mutex
);
3293 mutex_unlock(&mdsc
->mutex
);
3299 * delayed work -- periodically trim expired leases, renew caps with mds
3301 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
3304 unsigned hz
= round_jiffies_relative(HZ
* delay
);
3305 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
3308 static void delayed_work(struct work_struct
*work
)
3311 struct ceph_mds_client
*mdsc
=
3312 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
3316 dout("mdsc delayed_work\n");
3317 ceph_check_delayed_caps(mdsc
);
3319 mutex_lock(&mdsc
->mutex
);
3320 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
3321 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
3322 mdsc
->last_renew_caps
);
3324 mdsc
->last_renew_caps
= jiffies
;
3326 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3327 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3330 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3331 dout("resending session close request for mds%d\n",
3333 request_close_session(mdsc
, s
);
3334 ceph_put_mds_session(s
);
3337 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
3338 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
3339 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
3340 pr_info("mds%d hung\n", s
->s_mds
);
3343 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
3344 /* this mds is failed or recovering, just wait */
3345 ceph_put_mds_session(s
);
3348 mutex_unlock(&mdsc
->mutex
);
3350 mutex_lock(&s
->s_mutex
);
3352 send_renew_caps(mdsc
, s
);
3354 ceph_con_keepalive(&s
->s_con
);
3355 ceph_add_cap_releases(mdsc
, s
);
3356 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3357 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
3358 ceph_send_cap_releases(mdsc
, s
);
3359 mutex_unlock(&s
->s_mutex
);
3360 ceph_put_mds_session(s
);
3362 mutex_lock(&mdsc
->mutex
);
3364 mutex_unlock(&mdsc
->mutex
);
3366 schedule_delayed(mdsc
);
3369 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
3372 struct ceph_mds_client
*mdsc
;
3374 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
3379 mutex_init(&mdsc
->mutex
);
3380 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
3381 if (mdsc
->mdsmap
== NULL
) {
3386 init_completion(&mdsc
->safe_umount_waiters
);
3387 init_waitqueue_head(&mdsc
->session_close_wq
);
3388 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
3389 mdsc
->sessions
= NULL
;
3390 atomic_set(&mdsc
->num_sessions
, 0);
3391 mdsc
->max_sessions
= 0;
3393 init_rwsem(&mdsc
->snap_rwsem
);
3394 mdsc
->snap_realms
= RB_ROOT
;
3395 INIT_LIST_HEAD(&mdsc
->snap_empty
);
3396 spin_lock_init(&mdsc
->snap_empty_lock
);
3398 mdsc
->request_tree
= RB_ROOT
;
3399 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
3400 mdsc
->last_renew_caps
= jiffies
;
3401 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
3402 spin_lock_init(&mdsc
->cap_delay_lock
);
3403 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
3404 spin_lock_init(&mdsc
->snap_flush_lock
);
3405 mdsc
->cap_flush_seq
= 0;
3406 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
3407 INIT_LIST_HEAD(&mdsc
->cap_dirty_migrating
);
3408 mdsc
->num_cap_flushing
= 0;
3409 spin_lock_init(&mdsc
->cap_dirty_lock
);
3410 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
3411 spin_lock_init(&mdsc
->dentry_lru_lock
);
3412 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
3414 ceph_caps_init(mdsc
);
3415 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
3421 * Wait for safe replies on open mds requests. If we time out, drop
3422 * all requests from the tree to avoid dangling dentry refs.
3424 static void wait_requests(struct ceph_mds_client
*mdsc
)
3426 struct ceph_mds_request
*req
;
3427 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3429 mutex_lock(&mdsc
->mutex
);
3430 if (__get_oldest_req(mdsc
)) {
3431 mutex_unlock(&mdsc
->mutex
);
3433 dout("wait_requests waiting for requests\n");
3434 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
3435 fsc
->client
->options
->mount_timeout
* HZ
);
3437 /* tear down remaining requests */
3438 mutex_lock(&mdsc
->mutex
);
3439 while ((req
= __get_oldest_req(mdsc
))) {
3440 dout("wait_requests timed out on tid %llu\n",
3442 __unregister_request(mdsc
, req
);
3445 mutex_unlock(&mdsc
->mutex
);
3446 dout("wait_requests done\n");
3450 * called before mount is ro, and before dentries are torn down.
3451 * (hmm, does this still race with new lookups?)
3453 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
3455 dout("pre_umount\n");
3459 ceph_flush_dirty_caps(mdsc
);
3460 wait_requests(mdsc
);
3463 * wait for reply handlers to drop their request refs and
3464 * their inode/dcache refs
3470 * wait for all write mds requests to flush.
3472 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3474 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3477 mutex_lock(&mdsc
->mutex
);
3478 dout("wait_unsafe_requests want %lld\n", want_tid
);
3480 req
= __get_oldest_req(mdsc
);
3481 while (req
&& req
->r_tid
<= want_tid
) {
3482 /* find next request */
3483 n
= rb_next(&req
->r_node
);
3485 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3488 if ((req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3490 ceph_mdsc_get_request(req
);
3492 ceph_mdsc_get_request(nextreq
);
3493 mutex_unlock(&mdsc
->mutex
);
3494 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3495 req
->r_tid
, want_tid
);
3496 wait_for_completion(&req
->r_safe_completion
);
3497 mutex_lock(&mdsc
->mutex
);
3498 ceph_mdsc_put_request(req
);
3500 break; /* next dne before, so we're done! */
3501 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3502 /* next request was removed from tree */
3503 ceph_mdsc_put_request(nextreq
);
3506 ceph_mdsc_put_request(nextreq
); /* won't go away */
3510 mutex_unlock(&mdsc
->mutex
);
3511 dout("wait_unsafe_requests done\n");
3514 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3516 u64 want_tid
, want_flush
;
3518 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3522 mutex_lock(&mdsc
->mutex
);
3523 want_tid
= mdsc
->last_tid
;
3524 mutex_unlock(&mdsc
->mutex
);
3526 ceph_flush_dirty_caps(mdsc
);
3527 spin_lock(&mdsc
->cap_dirty_lock
);
3528 want_flush
= mdsc
->cap_flush_seq
;
3529 spin_unlock(&mdsc
->cap_dirty_lock
);
3531 dout("sync want tid %lld flush_seq %lld\n", want_tid
, want_flush
);
3533 wait_unsafe_requests(mdsc
, want_tid
);
3534 wait_caps_flush(mdsc
, want_flush
);
3538 * true if all sessions are closed, or we force unmount
3540 static bool done_closing_sessions(struct ceph_mds_client
*mdsc
)
3542 if (mdsc
->fsc
->mount_state
== CEPH_MOUNT_SHUTDOWN
)
3544 return atomic_read(&mdsc
->num_sessions
) == 0;
3548 * called after sb is ro.
3550 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3552 struct ceph_mds_session
*session
;
3554 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3555 unsigned long timeout
= fsc
->client
->options
->mount_timeout
* HZ
;
3557 dout("close_sessions\n");
3559 /* close sessions */
3560 mutex_lock(&mdsc
->mutex
);
3561 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3562 session
= __ceph_lookup_mds_session(mdsc
, i
);
3565 mutex_unlock(&mdsc
->mutex
);
3566 mutex_lock(&session
->s_mutex
);
3567 __close_session(mdsc
, session
);
3568 mutex_unlock(&session
->s_mutex
);
3569 ceph_put_mds_session(session
);
3570 mutex_lock(&mdsc
->mutex
);
3572 mutex_unlock(&mdsc
->mutex
);
3574 dout("waiting for sessions to close\n");
3575 wait_event_timeout(mdsc
->session_close_wq
, done_closing_sessions(mdsc
),
3578 /* tear down remaining sessions */
3579 mutex_lock(&mdsc
->mutex
);
3580 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3581 if (mdsc
->sessions
[i
]) {
3582 session
= get_session(mdsc
->sessions
[i
]);
3583 __unregister_session(mdsc
, session
);
3584 mutex_unlock(&mdsc
->mutex
);
3585 mutex_lock(&session
->s_mutex
);
3586 remove_session_caps(session
);
3587 mutex_unlock(&session
->s_mutex
);
3588 ceph_put_mds_session(session
);
3589 mutex_lock(&mdsc
->mutex
);
3592 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3593 mutex_unlock(&mdsc
->mutex
);
3595 ceph_cleanup_empty_realms(mdsc
);
3597 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3602 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3605 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3607 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3608 kfree(mdsc
->sessions
);
3609 ceph_caps_finalize(mdsc
);
3612 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3614 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3616 dout("mdsc_destroy %p\n", mdsc
);
3617 ceph_mdsc_stop(mdsc
);
3619 /* flush out any connection work with references to us */
3624 dout("mdsc_destroy %p done\n", mdsc
);
3629 * handle mds map update.
3631 void ceph_mdsc_handle_map(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3635 void *p
= msg
->front
.iov_base
;
3636 void *end
= p
+ msg
->front
.iov_len
;
3637 struct ceph_mdsmap
*newmap
, *oldmap
;
3638 struct ceph_fsid fsid
;
3641 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3642 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3643 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3645 epoch
= ceph_decode_32(&p
);
3646 maplen
= ceph_decode_32(&p
);
3647 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3649 /* do we need it? */
3650 ceph_monc_got_mdsmap(&mdsc
->fsc
->client
->monc
, epoch
);
3651 mutex_lock(&mdsc
->mutex
);
3652 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3653 dout("handle_map epoch %u <= our %u\n",
3654 epoch
, mdsc
->mdsmap
->m_epoch
);
3655 mutex_unlock(&mdsc
->mutex
);
3659 newmap
= ceph_mdsmap_decode(&p
, end
);
3660 if (IS_ERR(newmap
)) {
3661 err
= PTR_ERR(newmap
);
3665 /* swap into place */
3667 oldmap
= mdsc
->mdsmap
;
3668 mdsc
->mdsmap
= newmap
;
3669 check_new_map(mdsc
, newmap
, oldmap
);
3670 ceph_mdsmap_destroy(oldmap
);
3672 mdsc
->mdsmap
= newmap
; /* first mds map */
3674 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3676 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3678 mutex_unlock(&mdsc
->mutex
);
3679 schedule_delayed(mdsc
);
3683 mutex_unlock(&mdsc
->mutex
);
3685 pr_err("error decoding mdsmap %d\n", err
);
3689 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3691 struct ceph_mds_session
*s
= con
->private;
3693 if (get_session(s
)) {
3694 dout("mdsc con_get %p ok (%d)\n", s
, atomic_read(&s
->s_ref
));
3697 dout("mdsc con_get %p FAIL\n", s
);
3701 static void con_put(struct ceph_connection
*con
)
3703 struct ceph_mds_session
*s
= con
->private;
3705 dout("mdsc con_put %p (%d)\n", s
, atomic_read(&s
->s_ref
) - 1);
3706 ceph_put_mds_session(s
);
3710 * if the client is unresponsive for long enough, the mds will kill
3711 * the session entirely.
3713 static void peer_reset(struct ceph_connection
*con
)
3715 struct ceph_mds_session
*s
= con
->private;
3716 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3718 pr_warn("mds%d closed our session\n", s
->s_mds
);
3719 send_mds_reconnect(mdsc
, s
);
3722 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3724 struct ceph_mds_session
*s
= con
->private;
3725 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3726 int type
= le16_to_cpu(msg
->hdr
.type
);
3728 mutex_lock(&mdsc
->mutex
);
3729 if (__verify_registered_session(mdsc
, s
) < 0) {
3730 mutex_unlock(&mdsc
->mutex
);
3733 mutex_unlock(&mdsc
->mutex
);
3736 case CEPH_MSG_MDS_MAP
:
3737 ceph_mdsc_handle_map(mdsc
, msg
);
3739 case CEPH_MSG_CLIENT_SESSION
:
3740 handle_session(s
, msg
);
3742 case CEPH_MSG_CLIENT_REPLY
:
3743 handle_reply(s
, msg
);
3745 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3746 handle_forward(mdsc
, s
, msg
);
3748 case CEPH_MSG_CLIENT_CAPS
:
3749 ceph_handle_caps(s
, msg
);
3751 case CEPH_MSG_CLIENT_SNAP
:
3752 ceph_handle_snap(mdsc
, s
, msg
);
3754 case CEPH_MSG_CLIENT_LEASE
:
3755 handle_lease(mdsc
, s
, msg
);
3759 pr_err("received unknown message type %d %s\n", type
,
3760 ceph_msg_type_name(type
));
3771 * Note: returned pointer is the address of a structure that's
3772 * managed separately. Caller must *not* attempt to free it.
3774 static struct ceph_auth_handshake
*get_authorizer(struct ceph_connection
*con
,
3775 int *proto
, int force_new
)
3777 struct ceph_mds_session
*s
= con
->private;
3778 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3779 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3780 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
3782 if (force_new
&& auth
->authorizer
) {
3783 ceph_auth_destroy_authorizer(ac
, auth
->authorizer
);
3784 auth
->authorizer
= NULL
;
3786 if (!auth
->authorizer
) {
3787 int ret
= ceph_auth_create_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3790 return ERR_PTR(ret
);
3792 int ret
= ceph_auth_update_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
3795 return ERR_PTR(ret
);
3797 *proto
= ac
->protocol
;
3803 static int verify_authorizer_reply(struct ceph_connection
*con
, int len
)
3805 struct ceph_mds_session
*s
= con
->private;
3806 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3807 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3809 return ceph_auth_verify_authorizer_reply(ac
, s
->s_auth
.authorizer
, len
);
3812 static int invalidate_authorizer(struct ceph_connection
*con
)
3814 struct ceph_mds_session
*s
= con
->private;
3815 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3816 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
3818 ceph_auth_invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
3820 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
3823 static struct ceph_msg
*mds_alloc_msg(struct ceph_connection
*con
,
3824 struct ceph_msg_header
*hdr
, int *skip
)
3826 struct ceph_msg
*msg
;
3827 int type
= (int) le16_to_cpu(hdr
->type
);
3828 int front_len
= (int) le32_to_cpu(hdr
->front_len
);
3834 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
3836 pr_err("unable to allocate msg type %d len %d\n",
3844 static int sign_message(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3846 struct ceph_mds_session
*s
= con
->private;
3847 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
3848 return ceph_auth_sign_message(auth
, msg
);
3851 static int check_message_signature(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3853 struct ceph_mds_session
*s
= con
->private;
3854 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
3855 return ceph_auth_check_message_signature(auth
, msg
);
3858 static const struct ceph_connection_operations mds_con_ops
= {
3861 .dispatch
= dispatch
,
3862 .get_authorizer
= get_authorizer
,
3863 .verify_authorizer_reply
= verify_authorizer_reply
,
3864 .invalidate_authorizer
= invalidate_authorizer
,
3865 .peer_reset
= peer_reset
,
3866 .alloc_msg
= mds_alloc_msg
,
3867 .sign_message
= sign_message
,
3868 .check_message_signature
= check_message_signature
,