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>
11 #include <linux/ratelimit.h>
14 #include "mds_client.h"
16 #include <linux/ceph/ceph_features.h>
17 #include <linux/ceph/messenger.h>
18 #include <linux/ceph/decode.h>
19 #include <linux/ceph/pagelist.h>
20 #include <linux/ceph/auth.h>
21 #include <linux/ceph/debugfs.h>
24 * A cluster of MDS (metadata server) daemons is responsible for
25 * managing the file system namespace (the directory hierarchy and
26 * inodes) and for coordinating shared access to storage. Metadata is
27 * partitioning hierarchically across a number of servers, and that
28 * partition varies over time as the cluster adjusts the distribution
29 * in order to balance load.
31 * The MDS client is primarily responsible to managing synchronous
32 * metadata requests for operations like open, unlink, and so forth.
33 * If there is a MDS failure, we find out about it when we (possibly
34 * request and) receive a new MDS map, and can resubmit affected
37 * For the most part, though, we take advantage of a lossless
38 * communications channel to the MDS, and do not need to worry about
39 * timing out or resubmitting requests.
41 * We maintain a stateful "session" with each MDS we interact with.
42 * Within each session, we sent periodic heartbeat messages to ensure
43 * any capabilities or leases we have been issues remain valid. If
44 * the session times out and goes stale, our leases and capabilities
45 * are no longer valid.
48 struct ceph_reconnect_state
{
50 struct ceph_pagelist
*pagelist
;
54 static void __wake_requests(struct ceph_mds_client
*mdsc
,
55 struct list_head
*head
);
57 static const struct ceph_connection_operations mds_con_ops
;
65 * parse individual inode info
67 static int parse_reply_info_in(void **p
, void *end
,
68 struct ceph_mds_reply_info_in
*info
,
74 *p
+= sizeof(struct ceph_mds_reply_inode
) +
75 sizeof(*info
->in
->fragtree
.splits
) *
76 le32_to_cpu(info
->in
->fragtree
.nsplits
);
78 ceph_decode_32_safe(p
, end
, info
->symlink_len
, bad
);
79 ceph_decode_need(p
, end
, info
->symlink_len
, bad
);
81 *p
+= info
->symlink_len
;
83 if (features
& CEPH_FEATURE_DIRLAYOUTHASH
)
84 ceph_decode_copy_safe(p
, end
, &info
->dir_layout
,
85 sizeof(info
->dir_layout
), bad
);
87 memset(&info
->dir_layout
, 0, sizeof(info
->dir_layout
));
89 ceph_decode_32_safe(p
, end
, info
->xattr_len
, bad
);
90 ceph_decode_need(p
, end
, info
->xattr_len
, bad
);
91 info
->xattr_data
= *p
;
92 *p
+= info
->xattr_len
;
94 if (features
& CEPH_FEATURE_MDS_INLINE_DATA
) {
95 ceph_decode_64_safe(p
, end
, info
->inline_version
, bad
);
96 ceph_decode_32_safe(p
, end
, info
->inline_len
, bad
);
97 ceph_decode_need(p
, end
, info
->inline_len
, bad
);
98 info
->inline_data
= *p
;
99 *p
+= info
->inline_len
;
101 info
->inline_version
= CEPH_INLINE_NONE
;
103 info
->pool_ns_len
= 0;
104 info
->pool_ns_data
= NULL
;
105 if (features
& CEPH_FEATURE_FS_FILE_LAYOUT_V2
) {
106 ceph_decode_32_safe(p
, end
, info
->pool_ns_len
, bad
);
107 if (info
->pool_ns_len
> 0) {
108 ceph_decode_need(p
, end
, info
->pool_ns_len
, bad
);
109 info
->pool_ns_data
= *p
;
110 *p
+= info
->pool_ns_len
;
120 * parse a normal reply, which may contain a (dir+)dentry and/or a
123 static int parse_reply_info_trace(void **p
, void *end
,
124 struct ceph_mds_reply_info_parsed
*info
,
129 if (info
->head
->is_dentry
) {
130 err
= parse_reply_info_in(p
, end
, &info
->diri
, features
);
134 if (unlikely(*p
+ sizeof(*info
->dirfrag
) > end
))
137 *p
+= sizeof(*info
->dirfrag
) +
138 sizeof(u32
)*le32_to_cpu(info
->dirfrag
->ndist
);
139 if (unlikely(*p
> end
))
142 ceph_decode_32_safe(p
, end
, info
->dname_len
, bad
);
143 ceph_decode_need(p
, end
, info
->dname_len
, bad
);
145 *p
+= info
->dname_len
;
147 *p
+= sizeof(*info
->dlease
);
150 if (info
->head
->is_target
) {
151 err
= parse_reply_info_in(p
, end
, &info
->targeti
, features
);
156 if (unlikely(*p
!= end
))
163 pr_err("problem parsing mds trace %d\n", err
);
168 * parse readdir results
170 static int parse_reply_info_dir(void **p
, void *end
,
171 struct ceph_mds_reply_info_parsed
*info
,
178 if (*p
+ sizeof(*info
->dir_dir
) > end
)
180 *p
+= sizeof(*info
->dir_dir
) +
181 sizeof(u32
)*le32_to_cpu(info
->dir_dir
->ndist
);
185 ceph_decode_need(p
, end
, sizeof(num
) + 2, bad
);
186 num
= ceph_decode_32(p
);
188 u16 flags
= ceph_decode_16(p
);
189 info
->dir_end
= !!(flags
& CEPH_READDIR_FRAG_END
);
190 info
->dir_complete
= !!(flags
& CEPH_READDIR_FRAG_COMPLETE
);
191 info
->hash_order
= !!(flags
& CEPH_READDIR_HASH_ORDER
);
192 info
->offset_hash
= !!(flags
& CEPH_READDIR_OFFSET_HASH
);
197 BUG_ON(!info
->dir_entries
);
198 if ((unsigned long)(info
->dir_entries
+ num
) >
199 (unsigned long)info
->dir_entries
+ info
->dir_buf_size
) {
200 pr_err("dir contents are larger than expected\n");
207 struct ceph_mds_reply_dir_entry
*rde
= info
->dir_entries
+ i
;
209 ceph_decode_need(p
, end
, sizeof(u32
)*2, bad
);
210 rde
->name_len
= ceph_decode_32(p
);
211 ceph_decode_need(p
, end
, rde
->name_len
, bad
);
214 dout("parsed dir dname '%.*s'\n", rde
->name_len
, rde
->name
);
216 *p
+= sizeof(struct ceph_mds_reply_lease
);
219 err
= parse_reply_info_in(p
, end
, &rde
->inode
, features
);
222 /* ceph_readdir_prepopulate() will update it */
236 pr_err("problem parsing dir contents %d\n", err
);
241 * parse fcntl F_GETLK results
243 static int parse_reply_info_filelock(void **p
, void *end
,
244 struct ceph_mds_reply_info_parsed
*info
,
247 if (*p
+ sizeof(*info
->filelock_reply
) > end
)
250 info
->filelock_reply
= *p
;
251 *p
+= sizeof(*info
->filelock_reply
);
253 if (unlikely(*p
!= end
))
262 * parse create results
264 static int parse_reply_info_create(void **p
, void *end
,
265 struct ceph_mds_reply_info_parsed
*info
,
268 if (features
& CEPH_FEATURE_REPLY_CREATE_INODE
) {
270 info
->has_create_ino
= false;
272 info
->has_create_ino
= true;
273 info
->ino
= ceph_decode_64(p
);
277 if (unlikely(*p
!= end
))
286 * parse extra results
288 static int parse_reply_info_extra(void **p
, void *end
,
289 struct ceph_mds_reply_info_parsed
*info
,
292 u32 op
= le32_to_cpu(info
->head
->op
);
294 if (op
== CEPH_MDS_OP_GETFILELOCK
)
295 return parse_reply_info_filelock(p
, end
, info
, features
);
296 else if (op
== CEPH_MDS_OP_READDIR
|| op
== CEPH_MDS_OP_LSSNAP
)
297 return parse_reply_info_dir(p
, end
, info
, features
);
298 else if (op
== CEPH_MDS_OP_CREATE
)
299 return parse_reply_info_create(p
, end
, info
, features
);
305 * parse entire mds reply
307 static int parse_reply_info(struct ceph_msg
*msg
,
308 struct ceph_mds_reply_info_parsed
*info
,
315 info
->head
= msg
->front
.iov_base
;
316 p
= msg
->front
.iov_base
+ sizeof(struct ceph_mds_reply_head
);
317 end
= p
+ msg
->front
.iov_len
- sizeof(struct ceph_mds_reply_head
);
320 ceph_decode_32_safe(&p
, end
, len
, bad
);
322 ceph_decode_need(&p
, end
, len
, bad
);
323 err
= parse_reply_info_trace(&p
, p
+len
, info
, features
);
329 ceph_decode_32_safe(&p
, end
, len
, bad
);
331 ceph_decode_need(&p
, end
, len
, bad
);
332 err
= parse_reply_info_extra(&p
, p
+len
, info
, features
);
338 ceph_decode_32_safe(&p
, end
, len
, bad
);
339 info
->snapblob_len
= len
;
350 pr_err("mds parse_reply err %d\n", err
);
354 static void destroy_reply_info(struct ceph_mds_reply_info_parsed
*info
)
356 if (!info
->dir_entries
)
358 free_pages((unsigned long)info
->dir_entries
, get_order(info
->dir_buf_size
));
365 const char *ceph_session_state_name(int s
)
368 case CEPH_MDS_SESSION_NEW
: return "new";
369 case CEPH_MDS_SESSION_OPENING
: return "opening";
370 case CEPH_MDS_SESSION_OPEN
: return "open";
371 case CEPH_MDS_SESSION_HUNG
: return "hung";
372 case CEPH_MDS_SESSION_CLOSING
: return "closing";
373 case CEPH_MDS_SESSION_RESTARTING
: return "restarting";
374 case CEPH_MDS_SESSION_RECONNECTING
: return "reconnecting";
375 case CEPH_MDS_SESSION_REJECTED
: return "rejected";
376 default: return "???";
380 static struct ceph_mds_session
*get_session(struct ceph_mds_session
*s
)
382 if (refcount_inc_not_zero(&s
->s_ref
)) {
383 dout("mdsc get_session %p %d -> %d\n", s
,
384 refcount_read(&s
->s_ref
)-1, refcount_read(&s
->s_ref
));
387 dout("mdsc get_session %p 0 -- FAIL", s
);
392 void ceph_put_mds_session(struct ceph_mds_session
*s
)
394 dout("mdsc put_session %p %d -> %d\n", s
,
395 refcount_read(&s
->s_ref
), refcount_read(&s
->s_ref
)-1);
396 if (refcount_dec_and_test(&s
->s_ref
)) {
397 if (s
->s_auth
.authorizer
)
398 ceph_auth_destroy_authorizer(s
->s_auth
.authorizer
);
404 * called under mdsc->mutex
406 struct ceph_mds_session
*__ceph_lookup_mds_session(struct ceph_mds_client
*mdsc
,
409 struct ceph_mds_session
*session
;
411 if (mds
>= mdsc
->max_sessions
|| mdsc
->sessions
[mds
] == NULL
)
413 session
= mdsc
->sessions
[mds
];
414 dout("lookup_mds_session %p %d\n", session
,
415 refcount_read(&session
->s_ref
));
416 get_session(session
);
420 static bool __have_session(struct ceph_mds_client
*mdsc
, int mds
)
422 if (mds
>= mdsc
->max_sessions
)
424 return mdsc
->sessions
[mds
];
427 static int __verify_registered_session(struct ceph_mds_client
*mdsc
,
428 struct ceph_mds_session
*s
)
430 if (s
->s_mds
>= mdsc
->max_sessions
||
431 mdsc
->sessions
[s
->s_mds
] != s
)
437 * create+register a new session for given mds.
438 * called under mdsc->mutex.
440 static struct ceph_mds_session
*register_session(struct ceph_mds_client
*mdsc
,
443 struct ceph_mds_session
*s
;
445 if (mds
>= mdsc
->mdsmap
->m_num_mds
)
446 return ERR_PTR(-EINVAL
);
448 s
= kzalloc(sizeof(*s
), GFP_NOFS
);
450 return ERR_PTR(-ENOMEM
);
453 s
->s_state
= CEPH_MDS_SESSION_NEW
;
456 mutex_init(&s
->s_mutex
);
458 ceph_con_init(&s
->s_con
, s
, &mds_con_ops
, &mdsc
->fsc
->client
->msgr
);
460 spin_lock_init(&s
->s_gen_ttl_lock
);
462 s
->s_cap_ttl
= jiffies
- 1;
464 spin_lock_init(&s
->s_cap_lock
);
465 s
->s_renew_requested
= 0;
467 INIT_LIST_HEAD(&s
->s_caps
);
470 refcount_set(&s
->s_ref
, 1);
471 INIT_LIST_HEAD(&s
->s_waiting
);
472 INIT_LIST_HEAD(&s
->s_unsafe
);
473 s
->s_num_cap_releases
= 0;
474 s
->s_cap_reconnect
= 0;
475 s
->s_cap_iterator
= NULL
;
476 INIT_LIST_HEAD(&s
->s_cap_releases
);
477 INIT_LIST_HEAD(&s
->s_cap_flushing
);
479 dout("register_session mds%d\n", mds
);
480 if (mds
>= mdsc
->max_sessions
) {
481 int newmax
= 1 << get_count_order(mds
+1);
482 struct ceph_mds_session
**sa
;
484 dout("register_session realloc to %d\n", newmax
);
485 sa
= kcalloc(newmax
, sizeof(void *), GFP_NOFS
);
488 if (mdsc
->sessions
) {
489 memcpy(sa
, mdsc
->sessions
,
490 mdsc
->max_sessions
* sizeof(void *));
491 kfree(mdsc
->sessions
);
494 mdsc
->max_sessions
= newmax
;
496 mdsc
->sessions
[mds
] = s
;
497 atomic_inc(&mdsc
->num_sessions
);
498 refcount_inc(&s
->s_ref
); /* one ref to sessions[], one to caller */
500 ceph_con_open(&s
->s_con
, CEPH_ENTITY_TYPE_MDS
, mds
,
501 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
507 return ERR_PTR(-ENOMEM
);
511 * called under mdsc->mutex
513 static void __unregister_session(struct ceph_mds_client
*mdsc
,
514 struct ceph_mds_session
*s
)
516 dout("__unregister_session mds%d %p\n", s
->s_mds
, s
);
517 BUG_ON(mdsc
->sessions
[s
->s_mds
] != s
);
518 mdsc
->sessions
[s
->s_mds
] = NULL
;
519 ceph_con_close(&s
->s_con
);
520 ceph_put_mds_session(s
);
521 atomic_dec(&mdsc
->num_sessions
);
525 * drop session refs in request.
527 * should be last request ref, or hold mdsc->mutex
529 static void put_request_session(struct ceph_mds_request
*req
)
531 if (req
->r_session
) {
532 ceph_put_mds_session(req
->r_session
);
533 req
->r_session
= NULL
;
537 void ceph_mdsc_release_request(struct kref
*kref
)
539 struct ceph_mds_request
*req
= container_of(kref
,
540 struct ceph_mds_request
,
542 destroy_reply_info(&req
->r_reply_info
);
544 ceph_msg_put(req
->r_request
);
546 ceph_msg_put(req
->r_reply
);
548 ceph_put_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
552 ceph_put_cap_refs(ceph_inode(req
->r_parent
), CEPH_CAP_PIN
);
553 iput(req
->r_target_inode
);
556 if (req
->r_old_dentry
)
557 dput(req
->r_old_dentry
);
558 if (req
->r_old_dentry_dir
) {
560 * track (and drop pins for) r_old_dentry_dir
561 * separately, since r_old_dentry's d_parent may have
562 * changed between the dir mutex being dropped and
563 * this request being freed.
565 ceph_put_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
567 iput(req
->r_old_dentry_dir
);
572 ceph_pagelist_release(req
->r_pagelist
);
573 put_request_session(req
);
574 ceph_unreserve_caps(req
->r_mdsc
, &req
->r_caps_reservation
);
578 DEFINE_RB_FUNCS(request
, struct ceph_mds_request
, r_tid
, r_node
)
581 * lookup session, bump ref if found.
583 * called under mdsc->mutex.
585 static struct ceph_mds_request
*
586 lookup_get_request(struct ceph_mds_client
*mdsc
, u64 tid
)
588 struct ceph_mds_request
*req
;
590 req
= lookup_request(&mdsc
->request_tree
, tid
);
592 ceph_mdsc_get_request(req
);
598 * Register an in-flight request, and assign a tid. Link to directory
599 * are modifying (if any).
601 * Called under mdsc->mutex.
603 static void __register_request(struct ceph_mds_client
*mdsc
,
604 struct ceph_mds_request
*req
,
607 req
->r_tid
= ++mdsc
->last_tid
;
609 ceph_reserve_caps(mdsc
, &req
->r_caps_reservation
,
611 dout("__register_request %p tid %lld\n", req
, req
->r_tid
);
612 ceph_mdsc_get_request(req
);
613 insert_request(&mdsc
->request_tree
, req
);
615 req
->r_uid
= current_fsuid();
616 req
->r_gid
= current_fsgid();
618 if (mdsc
->oldest_tid
== 0 && req
->r_op
!= CEPH_MDS_OP_SETFILELOCK
)
619 mdsc
->oldest_tid
= req
->r_tid
;
623 req
->r_unsafe_dir
= dir
;
627 static void __unregister_request(struct ceph_mds_client
*mdsc
,
628 struct ceph_mds_request
*req
)
630 dout("__unregister_request %p tid %lld\n", req
, req
->r_tid
);
632 /* Never leave an unregistered request on an unsafe list! */
633 list_del_init(&req
->r_unsafe_item
);
635 if (req
->r_tid
== mdsc
->oldest_tid
) {
636 struct rb_node
*p
= rb_next(&req
->r_node
);
637 mdsc
->oldest_tid
= 0;
639 struct ceph_mds_request
*next_req
=
640 rb_entry(p
, struct ceph_mds_request
, r_node
);
641 if (next_req
->r_op
!= CEPH_MDS_OP_SETFILELOCK
) {
642 mdsc
->oldest_tid
= next_req
->r_tid
;
649 erase_request(&mdsc
->request_tree
, req
);
651 if (req
->r_unsafe_dir
&&
652 test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
)) {
653 struct ceph_inode_info
*ci
= ceph_inode(req
->r_unsafe_dir
);
654 spin_lock(&ci
->i_unsafe_lock
);
655 list_del_init(&req
->r_unsafe_dir_item
);
656 spin_unlock(&ci
->i_unsafe_lock
);
658 if (req
->r_target_inode
&&
659 test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
)) {
660 struct ceph_inode_info
*ci
= ceph_inode(req
->r_target_inode
);
661 spin_lock(&ci
->i_unsafe_lock
);
662 list_del_init(&req
->r_unsafe_target_item
);
663 spin_unlock(&ci
->i_unsafe_lock
);
666 if (req
->r_unsafe_dir
) {
667 iput(req
->r_unsafe_dir
);
668 req
->r_unsafe_dir
= NULL
;
671 complete_all(&req
->r_safe_completion
);
673 ceph_mdsc_put_request(req
);
677 * Walk back up the dentry tree until we hit a dentry representing a
678 * non-snapshot inode. We do this using the rcu_read_lock (which must be held
679 * when calling this) to ensure that the objects won't disappear while we're
680 * working with them. Once we hit a candidate dentry, we attempt to take a
681 * reference to it, and return that as the result.
683 static struct inode
*get_nonsnap_parent(struct dentry
*dentry
)
685 struct inode
*inode
= NULL
;
687 while (dentry
&& !IS_ROOT(dentry
)) {
688 inode
= d_inode_rcu(dentry
);
689 if (!inode
|| ceph_snap(inode
) == CEPH_NOSNAP
)
691 dentry
= dentry
->d_parent
;
694 inode
= igrab(inode
);
699 * Choose mds to send request to next. If there is a hint set in the
700 * request (e.g., due to a prior forward hint from the mds), use that.
701 * Otherwise, consult frag tree and/or caps to identify the
702 * appropriate mds. If all else fails, choose randomly.
704 * Called under mdsc->mutex.
706 static int __choose_mds(struct ceph_mds_client
*mdsc
,
707 struct ceph_mds_request
*req
)
710 struct ceph_inode_info
*ci
;
711 struct ceph_cap
*cap
;
712 int mode
= req
->r_direct_mode
;
714 u32 hash
= req
->r_direct_hash
;
715 bool is_hash
= test_bit(CEPH_MDS_R_DIRECT_IS_HASH
, &req
->r_req_flags
);
718 * is there a specific mds we should try? ignore hint if we have
719 * no session and the mds is not up (active or recovering).
721 if (req
->r_resend_mds
>= 0 &&
722 (__have_session(mdsc
, req
->r_resend_mds
) ||
723 ceph_mdsmap_get_state(mdsc
->mdsmap
, req
->r_resend_mds
) > 0)) {
724 dout("choose_mds using resend_mds mds%d\n",
726 return req
->r_resend_mds
;
729 if (mode
== USE_RANDOM_MDS
)
734 inode
= req
->r_inode
;
736 } else if (req
->r_dentry
) {
737 /* ignore race with rename; old or new d_parent is okay */
738 struct dentry
*parent
;
742 parent
= req
->r_dentry
->d_parent
;
743 dir
= req
->r_parent
? : d_inode_rcu(parent
);
745 if (!dir
|| dir
->i_sb
!= mdsc
->fsc
->sb
) {
746 /* not this fs or parent went negative */
747 inode
= d_inode(req
->r_dentry
);
750 } else if (ceph_snap(dir
) != CEPH_NOSNAP
) {
751 /* direct snapped/virtual snapdir requests
752 * based on parent dir inode */
753 inode
= get_nonsnap_parent(parent
);
754 dout("__choose_mds using nonsnap parent %p\n", inode
);
757 inode
= d_inode(req
->r_dentry
);
758 if (!inode
|| mode
== USE_AUTH_MDS
) {
761 hash
= ceph_dentry_hash(dir
, req
->r_dentry
);
770 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode
, (int)is_hash
,
774 ci
= ceph_inode(inode
);
776 if (is_hash
&& S_ISDIR(inode
->i_mode
)) {
777 struct ceph_inode_frag frag
;
780 ceph_choose_frag(ci
, hash
, &frag
, &found
);
782 if (mode
== USE_ANY_MDS
&& frag
.ndist
> 0) {
785 /* choose a random replica */
786 get_random_bytes(&r
, 1);
789 dout("choose_mds %p %llx.%llx "
790 "frag %u mds%d (%d/%d)\n",
791 inode
, ceph_vinop(inode
),
794 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
795 CEPH_MDS_STATE_ACTIVE
)
799 /* since this file/dir wasn't known to be
800 * replicated, then we want to look for the
801 * authoritative mds. */
804 /* choose auth mds */
806 dout("choose_mds %p %llx.%llx "
807 "frag %u mds%d (auth)\n",
808 inode
, ceph_vinop(inode
), frag
.frag
, mds
);
809 if (ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) >=
810 CEPH_MDS_STATE_ACTIVE
)
816 spin_lock(&ci
->i_ceph_lock
);
818 if (mode
== USE_AUTH_MDS
)
819 cap
= ci
->i_auth_cap
;
820 if (!cap
&& !RB_EMPTY_ROOT(&ci
->i_caps
))
821 cap
= rb_entry(rb_first(&ci
->i_caps
), struct ceph_cap
, ci_node
);
823 spin_unlock(&ci
->i_ceph_lock
);
827 mds
= cap
->session
->s_mds
;
828 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
829 inode
, ceph_vinop(inode
), mds
,
830 cap
== ci
->i_auth_cap
? "auth " : "", cap
);
831 spin_unlock(&ci
->i_ceph_lock
);
837 mds
= ceph_mdsmap_get_random_mds(mdsc
->mdsmap
);
838 dout("choose_mds chose random mds%d\n", mds
);
846 static struct ceph_msg
*create_session_msg(u32 op
, u64 seq
)
848 struct ceph_msg
*msg
;
849 struct ceph_mds_session_head
*h
;
851 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
), GFP_NOFS
,
854 pr_err("create_session_msg ENOMEM creating msg\n");
857 h
= msg
->front
.iov_base
;
858 h
->op
= cpu_to_le32(op
);
859 h
->seq
= cpu_to_le64(seq
);
865 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
866 * to include additional client metadata fields.
868 static struct ceph_msg
*create_session_open_msg(struct ceph_mds_client
*mdsc
, u64 seq
)
870 struct ceph_msg
*msg
;
871 struct ceph_mds_session_head
*h
;
873 int metadata_bytes
= 0;
874 int metadata_key_count
= 0;
875 struct ceph_options
*opt
= mdsc
->fsc
->client
->options
;
876 struct ceph_mount_options
*fsopt
= mdsc
->fsc
->mount_options
;
879 const char* metadata
[][2] = {
880 {"hostname", utsname()->nodename
},
881 {"kernel_version", utsname()->release
},
882 {"entity_id", opt
->name
? : ""},
883 {"root", fsopt
->server_path
? : "/"},
887 /* Calculate serialized length of metadata */
888 metadata_bytes
= 4; /* map length */
889 for (i
= 0; metadata
[i
][0] != NULL
; ++i
) {
890 metadata_bytes
+= 8 + strlen(metadata
[i
][0]) +
891 strlen(metadata
[i
][1]);
892 metadata_key_count
++;
895 /* Allocate the message */
896 msg
= ceph_msg_new(CEPH_MSG_CLIENT_SESSION
, sizeof(*h
) + metadata_bytes
,
899 pr_err("create_session_msg ENOMEM creating msg\n");
902 h
= msg
->front
.iov_base
;
903 h
->op
= cpu_to_le32(CEPH_SESSION_REQUEST_OPEN
);
904 h
->seq
= cpu_to_le64(seq
);
907 * Serialize client metadata into waiting buffer space, using
908 * the format that userspace expects for map<string, string>
910 * ClientSession messages with metadata are v2
912 msg
->hdr
.version
= cpu_to_le16(2);
913 msg
->hdr
.compat_version
= cpu_to_le16(1);
915 /* The write pointer, following the session_head structure */
916 p
= msg
->front
.iov_base
+ sizeof(*h
);
918 /* Number of entries in the map */
919 ceph_encode_32(&p
, metadata_key_count
);
921 /* Two length-prefixed strings for each entry in the map */
922 for (i
= 0; metadata
[i
][0] != NULL
; ++i
) {
923 size_t const key_len
= strlen(metadata
[i
][0]);
924 size_t const val_len
= strlen(metadata
[i
][1]);
926 ceph_encode_32(&p
, key_len
);
927 memcpy(p
, metadata
[i
][0], key_len
);
929 ceph_encode_32(&p
, val_len
);
930 memcpy(p
, metadata
[i
][1], val_len
);
938 * send session open request.
940 * called under mdsc->mutex
942 static int __open_session(struct ceph_mds_client
*mdsc
,
943 struct ceph_mds_session
*session
)
945 struct ceph_msg
*msg
;
947 int mds
= session
->s_mds
;
949 /* wait for mds to go active? */
950 mstate
= ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
);
951 dout("open_session to mds%d (%s)\n", mds
,
952 ceph_mds_state_name(mstate
));
953 session
->s_state
= CEPH_MDS_SESSION_OPENING
;
954 session
->s_renew_requested
= jiffies
;
956 /* send connect message */
957 msg
= create_session_open_msg(mdsc
, session
->s_seq
);
960 ceph_con_send(&session
->s_con
, msg
);
965 * open sessions for any export targets for the given mds
967 * called under mdsc->mutex
969 static struct ceph_mds_session
*
970 __open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
972 struct ceph_mds_session
*session
;
974 session
= __ceph_lookup_mds_session(mdsc
, target
);
976 session
= register_session(mdsc
, target
);
980 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
981 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
982 __open_session(mdsc
, session
);
987 struct ceph_mds_session
*
988 ceph_mdsc_open_export_target_session(struct ceph_mds_client
*mdsc
, int target
)
990 struct ceph_mds_session
*session
;
992 dout("open_export_target_session to mds%d\n", target
);
994 mutex_lock(&mdsc
->mutex
);
995 session
= __open_export_target_session(mdsc
, target
);
996 mutex_unlock(&mdsc
->mutex
);
1001 static void __open_export_target_sessions(struct ceph_mds_client
*mdsc
,
1002 struct ceph_mds_session
*session
)
1004 struct ceph_mds_info
*mi
;
1005 struct ceph_mds_session
*ts
;
1006 int i
, mds
= session
->s_mds
;
1008 if (mds
>= mdsc
->mdsmap
->m_num_mds
)
1011 mi
= &mdsc
->mdsmap
->m_info
[mds
];
1012 dout("open_export_target_sessions for mds%d (%d targets)\n",
1013 session
->s_mds
, mi
->num_export_targets
);
1015 for (i
= 0; i
< mi
->num_export_targets
; i
++) {
1016 ts
= __open_export_target_session(mdsc
, mi
->export_targets
[i
]);
1018 ceph_put_mds_session(ts
);
1022 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client
*mdsc
,
1023 struct ceph_mds_session
*session
)
1025 mutex_lock(&mdsc
->mutex
);
1026 __open_export_target_sessions(mdsc
, session
);
1027 mutex_unlock(&mdsc
->mutex
);
1034 /* caller holds s_cap_lock, we drop it */
1035 static void cleanup_cap_releases(struct ceph_mds_client
*mdsc
,
1036 struct ceph_mds_session
*session
)
1037 __releases(session
->s_cap_lock
)
1039 LIST_HEAD(tmp_list
);
1040 list_splice_init(&session
->s_cap_releases
, &tmp_list
);
1041 session
->s_num_cap_releases
= 0;
1042 spin_unlock(&session
->s_cap_lock
);
1044 dout("cleanup_cap_releases mds%d\n", session
->s_mds
);
1045 while (!list_empty(&tmp_list
)) {
1046 struct ceph_cap
*cap
;
1047 /* zero out the in-progress message */
1048 cap
= list_first_entry(&tmp_list
,
1049 struct ceph_cap
, session_caps
);
1050 list_del(&cap
->session_caps
);
1051 ceph_put_cap(mdsc
, cap
);
1055 static void cleanup_session_requests(struct ceph_mds_client
*mdsc
,
1056 struct ceph_mds_session
*session
)
1058 struct ceph_mds_request
*req
;
1061 dout("cleanup_session_requests mds%d\n", session
->s_mds
);
1062 mutex_lock(&mdsc
->mutex
);
1063 while (!list_empty(&session
->s_unsafe
)) {
1064 req
= list_first_entry(&session
->s_unsafe
,
1065 struct ceph_mds_request
, r_unsafe_item
);
1066 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1068 __unregister_request(mdsc
, req
);
1070 /* zero r_attempts, so kick_requests() will re-send requests */
1071 p
= rb_first(&mdsc
->request_tree
);
1073 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
1075 if (req
->r_session
&&
1076 req
->r_session
->s_mds
== session
->s_mds
)
1077 req
->r_attempts
= 0;
1079 mutex_unlock(&mdsc
->mutex
);
1083 * Helper to safely iterate over all caps associated with a session, with
1084 * special care taken to handle a racing __ceph_remove_cap().
1086 * Caller must hold session s_mutex.
1088 static int iterate_session_caps(struct ceph_mds_session
*session
,
1089 int (*cb
)(struct inode
*, struct ceph_cap
*,
1092 struct list_head
*p
;
1093 struct ceph_cap
*cap
;
1094 struct inode
*inode
, *last_inode
= NULL
;
1095 struct ceph_cap
*old_cap
= NULL
;
1098 dout("iterate_session_caps %p mds%d\n", session
, session
->s_mds
);
1099 spin_lock(&session
->s_cap_lock
);
1100 p
= session
->s_caps
.next
;
1101 while (p
!= &session
->s_caps
) {
1102 cap
= list_entry(p
, struct ceph_cap
, session_caps
);
1103 inode
= igrab(&cap
->ci
->vfs_inode
);
1108 session
->s_cap_iterator
= cap
;
1109 spin_unlock(&session
->s_cap_lock
);
1116 ceph_put_cap(session
->s_mdsc
, old_cap
);
1120 ret
= cb(inode
, cap
, arg
);
1123 spin_lock(&session
->s_cap_lock
);
1125 if (cap
->ci
== NULL
) {
1126 dout("iterate_session_caps finishing cap %p removal\n",
1128 BUG_ON(cap
->session
!= session
);
1129 cap
->session
= NULL
;
1130 list_del_init(&cap
->session_caps
);
1131 session
->s_nr_caps
--;
1132 if (cap
->queue_release
) {
1133 list_add_tail(&cap
->session_caps
,
1134 &session
->s_cap_releases
);
1135 session
->s_num_cap_releases
++;
1137 old_cap
= cap
; /* put_cap it w/o locks held */
1145 session
->s_cap_iterator
= NULL
;
1146 spin_unlock(&session
->s_cap_lock
);
1150 ceph_put_cap(session
->s_mdsc
, old_cap
);
1155 static int remove_session_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1158 struct ceph_fs_client
*fsc
= (struct ceph_fs_client
*)arg
;
1159 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1160 LIST_HEAD(to_remove
);
1162 bool invalidate
= false;
1164 dout("removing cap %p, ci is %p, inode is %p\n",
1165 cap
, ci
, &ci
->vfs_inode
);
1166 spin_lock(&ci
->i_ceph_lock
);
1167 __ceph_remove_cap(cap
, false);
1168 if (!ci
->i_auth_cap
) {
1169 struct ceph_cap_flush
*cf
;
1170 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
1172 ci
->i_ceph_flags
|= CEPH_I_CAP_DROPPED
;
1174 if (ci
->i_wrbuffer_ref
> 0 &&
1175 READ_ONCE(fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
)
1178 while (!list_empty(&ci
->i_cap_flush_list
)) {
1179 cf
= list_first_entry(&ci
->i_cap_flush_list
,
1180 struct ceph_cap_flush
, i_list
);
1181 list_move(&cf
->i_list
, &to_remove
);
1184 spin_lock(&mdsc
->cap_dirty_lock
);
1186 list_for_each_entry(cf
, &to_remove
, i_list
)
1187 list_del(&cf
->g_list
);
1189 if (!list_empty(&ci
->i_dirty_item
)) {
1190 pr_warn_ratelimited(
1191 " dropping dirty %s state for %p %lld\n",
1192 ceph_cap_string(ci
->i_dirty_caps
),
1193 inode
, ceph_ino(inode
));
1194 ci
->i_dirty_caps
= 0;
1195 list_del_init(&ci
->i_dirty_item
);
1198 if (!list_empty(&ci
->i_flushing_item
)) {
1199 pr_warn_ratelimited(
1200 " dropping dirty+flushing %s state for %p %lld\n",
1201 ceph_cap_string(ci
->i_flushing_caps
),
1202 inode
, ceph_ino(inode
));
1203 ci
->i_flushing_caps
= 0;
1204 list_del_init(&ci
->i_flushing_item
);
1205 mdsc
->num_cap_flushing
--;
1208 spin_unlock(&mdsc
->cap_dirty_lock
);
1210 if (!ci
->i_dirty_caps
&& ci
->i_prealloc_cap_flush
) {
1211 list_add(&ci
->i_prealloc_cap_flush
->i_list
, &to_remove
);
1212 ci
->i_prealloc_cap_flush
= NULL
;
1215 spin_unlock(&ci
->i_ceph_lock
);
1216 while (!list_empty(&to_remove
)) {
1217 struct ceph_cap_flush
*cf
;
1218 cf
= list_first_entry(&to_remove
,
1219 struct ceph_cap_flush
, i_list
);
1220 list_del(&cf
->i_list
);
1221 ceph_free_cap_flush(cf
);
1224 wake_up_all(&ci
->i_cap_wq
);
1226 ceph_queue_invalidate(inode
);
1233 * caller must hold session s_mutex
1235 static void remove_session_caps(struct ceph_mds_session
*session
)
1237 struct ceph_fs_client
*fsc
= session
->s_mdsc
->fsc
;
1238 struct super_block
*sb
= fsc
->sb
;
1239 dout("remove_session_caps on %p\n", session
);
1240 iterate_session_caps(session
, remove_session_caps_cb
, fsc
);
1242 wake_up_all(&fsc
->mdsc
->cap_flushing_wq
);
1244 spin_lock(&session
->s_cap_lock
);
1245 if (session
->s_nr_caps
> 0) {
1246 struct inode
*inode
;
1247 struct ceph_cap
*cap
, *prev
= NULL
;
1248 struct ceph_vino vino
;
1250 * iterate_session_caps() skips inodes that are being
1251 * deleted, we need to wait until deletions are complete.
1252 * __wait_on_freeing_inode() is designed for the job,
1253 * but it is not exported, so use lookup inode function
1256 while (!list_empty(&session
->s_caps
)) {
1257 cap
= list_entry(session
->s_caps
.next
,
1258 struct ceph_cap
, session_caps
);
1262 vino
= cap
->ci
->i_vino
;
1263 spin_unlock(&session
->s_cap_lock
);
1265 inode
= ceph_find_inode(sb
, vino
);
1268 spin_lock(&session
->s_cap_lock
);
1272 // drop cap expires and unlock s_cap_lock
1273 cleanup_cap_releases(session
->s_mdsc
, session
);
1275 BUG_ON(session
->s_nr_caps
> 0);
1276 BUG_ON(!list_empty(&session
->s_cap_flushing
));
1280 * wake up any threads waiting on this session's caps. if the cap is
1281 * old (didn't get renewed on the client reconnect), remove it now.
1283 * caller must hold s_mutex.
1285 static int wake_up_session_cb(struct inode
*inode
, struct ceph_cap
*cap
,
1288 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1291 spin_lock(&ci
->i_ceph_lock
);
1292 ci
->i_wanted_max_size
= 0;
1293 ci
->i_requested_max_size
= 0;
1294 spin_unlock(&ci
->i_ceph_lock
);
1296 wake_up_all(&ci
->i_cap_wq
);
1300 static void wake_up_session_caps(struct ceph_mds_session
*session
,
1303 dout("wake_up_session_caps %p mds%d\n", session
, session
->s_mds
);
1304 iterate_session_caps(session
, wake_up_session_cb
,
1305 (void *)(unsigned long)reconnect
);
1309 * Send periodic message to MDS renewing all currently held caps. The
1310 * ack will reset the expiration for all caps from this session.
1312 * caller holds s_mutex
1314 static int send_renew_caps(struct ceph_mds_client
*mdsc
,
1315 struct ceph_mds_session
*session
)
1317 struct ceph_msg
*msg
;
1320 if (time_after_eq(jiffies
, session
->s_cap_ttl
) &&
1321 time_after_eq(session
->s_cap_ttl
, session
->s_renew_requested
))
1322 pr_info("mds%d caps stale\n", session
->s_mds
);
1323 session
->s_renew_requested
= jiffies
;
1325 /* do not try to renew caps until a recovering mds has reconnected
1326 * with its clients. */
1327 state
= ceph_mdsmap_get_state(mdsc
->mdsmap
, session
->s_mds
);
1328 if (state
< CEPH_MDS_STATE_RECONNECT
) {
1329 dout("send_renew_caps ignoring mds%d (%s)\n",
1330 session
->s_mds
, ceph_mds_state_name(state
));
1334 dout("send_renew_caps to mds%d (%s)\n", session
->s_mds
,
1335 ceph_mds_state_name(state
));
1336 msg
= create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS
,
1337 ++session
->s_renew_seq
);
1340 ceph_con_send(&session
->s_con
, msg
);
1344 static int send_flushmsg_ack(struct ceph_mds_client
*mdsc
,
1345 struct ceph_mds_session
*session
, u64 seq
)
1347 struct ceph_msg
*msg
;
1349 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1350 session
->s_mds
, ceph_session_state_name(session
->s_state
), seq
);
1351 msg
= create_session_msg(CEPH_SESSION_FLUSHMSG_ACK
, seq
);
1354 ceph_con_send(&session
->s_con
, msg
);
1360 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1362 * Called under session->s_mutex
1364 static void renewed_caps(struct ceph_mds_client
*mdsc
,
1365 struct ceph_mds_session
*session
, int is_renew
)
1370 spin_lock(&session
->s_cap_lock
);
1371 was_stale
= is_renew
&& time_after_eq(jiffies
, session
->s_cap_ttl
);
1373 session
->s_cap_ttl
= session
->s_renew_requested
+
1374 mdsc
->mdsmap
->m_session_timeout
*HZ
;
1377 if (time_before(jiffies
, session
->s_cap_ttl
)) {
1378 pr_info("mds%d caps renewed\n", session
->s_mds
);
1381 pr_info("mds%d caps still stale\n", session
->s_mds
);
1384 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1385 session
->s_mds
, session
->s_cap_ttl
, was_stale
? "stale" : "fresh",
1386 time_before(jiffies
, session
->s_cap_ttl
) ? "stale" : "fresh");
1387 spin_unlock(&session
->s_cap_lock
);
1390 wake_up_session_caps(session
, 0);
1394 * send a session close request
1396 static int request_close_session(struct ceph_mds_client
*mdsc
,
1397 struct ceph_mds_session
*session
)
1399 struct ceph_msg
*msg
;
1401 dout("request_close_session mds%d state %s seq %lld\n",
1402 session
->s_mds
, ceph_session_state_name(session
->s_state
),
1404 msg
= create_session_msg(CEPH_SESSION_REQUEST_CLOSE
, session
->s_seq
);
1407 ceph_con_send(&session
->s_con
, msg
);
1412 * Called with s_mutex held.
1414 static int __close_session(struct ceph_mds_client
*mdsc
,
1415 struct ceph_mds_session
*session
)
1417 if (session
->s_state
>= CEPH_MDS_SESSION_CLOSING
)
1419 session
->s_state
= CEPH_MDS_SESSION_CLOSING
;
1420 return request_close_session(mdsc
, session
);
1424 * Trim old(er) caps.
1426 * Because we can't cache an inode without one or more caps, we do
1427 * this indirectly: if a cap is unused, we prune its aliases, at which
1428 * point the inode will hopefully get dropped to.
1430 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1431 * memory pressure from the MDS, though, so it needn't be perfect.
1433 static int trim_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
, void *arg
)
1435 struct ceph_mds_session
*session
= arg
;
1436 struct ceph_inode_info
*ci
= ceph_inode(inode
);
1437 int used
, wanted
, oissued
, mine
;
1439 if (session
->s_trim_caps
<= 0)
1442 spin_lock(&ci
->i_ceph_lock
);
1443 mine
= cap
->issued
| cap
->implemented
;
1444 used
= __ceph_caps_used(ci
);
1445 wanted
= __ceph_caps_file_wanted(ci
);
1446 oissued
= __ceph_caps_issued_other(ci
, cap
);
1448 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1449 inode
, cap
, ceph_cap_string(mine
), ceph_cap_string(oissued
),
1450 ceph_cap_string(used
), ceph_cap_string(wanted
));
1451 if (cap
== ci
->i_auth_cap
) {
1452 if (ci
->i_dirty_caps
|| ci
->i_flushing_caps
||
1453 !list_empty(&ci
->i_cap_snaps
))
1455 if ((used
| wanted
) & CEPH_CAP_ANY_WR
)
1458 /* The inode has cached pages, but it's no longer used.
1459 * we can safely drop it */
1460 if (wanted
== 0 && used
== CEPH_CAP_FILE_CACHE
&&
1461 !(oissued
& CEPH_CAP_FILE_CACHE
)) {
1465 if ((used
| wanted
) & ~oissued
& mine
)
1466 goto out
; /* we need these caps */
1468 session
->s_trim_caps
--;
1470 /* we aren't the only cap.. just remove us */
1471 __ceph_remove_cap(cap
, true);
1473 /* try dropping referring dentries */
1474 spin_unlock(&ci
->i_ceph_lock
);
1475 d_prune_aliases(inode
);
1476 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1477 inode
, cap
, atomic_read(&inode
->i_count
));
1482 spin_unlock(&ci
->i_ceph_lock
);
1487 * Trim session cap count down to some max number.
1489 static int trim_caps(struct ceph_mds_client
*mdsc
,
1490 struct ceph_mds_session
*session
,
1493 int trim_caps
= session
->s_nr_caps
- max_caps
;
1495 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1496 session
->s_mds
, session
->s_nr_caps
, max_caps
, trim_caps
);
1497 if (trim_caps
> 0) {
1498 session
->s_trim_caps
= trim_caps
;
1499 iterate_session_caps(session
, trim_caps_cb
, session
);
1500 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1501 session
->s_mds
, session
->s_nr_caps
, max_caps
,
1502 trim_caps
- session
->s_trim_caps
);
1503 session
->s_trim_caps
= 0;
1506 ceph_send_cap_releases(mdsc
, session
);
1510 static int check_caps_flush(struct ceph_mds_client
*mdsc
,
1515 spin_lock(&mdsc
->cap_dirty_lock
);
1516 if (!list_empty(&mdsc
->cap_flush_list
)) {
1517 struct ceph_cap_flush
*cf
=
1518 list_first_entry(&mdsc
->cap_flush_list
,
1519 struct ceph_cap_flush
, g_list
);
1520 if (cf
->tid
<= want_flush_tid
) {
1521 dout("check_caps_flush still flushing tid "
1522 "%llu <= %llu\n", cf
->tid
, want_flush_tid
);
1526 spin_unlock(&mdsc
->cap_dirty_lock
);
1531 * flush all dirty inode data to disk.
1533 * returns true if we've flushed through want_flush_tid
1535 static void wait_caps_flush(struct ceph_mds_client
*mdsc
,
1538 dout("check_caps_flush want %llu\n", want_flush_tid
);
1540 wait_event(mdsc
->cap_flushing_wq
,
1541 check_caps_flush(mdsc
, want_flush_tid
));
1543 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid
);
1547 * called under s_mutex
1549 void ceph_send_cap_releases(struct ceph_mds_client
*mdsc
,
1550 struct ceph_mds_session
*session
)
1552 struct ceph_msg
*msg
= NULL
;
1553 struct ceph_mds_cap_release
*head
;
1554 struct ceph_mds_cap_item
*item
;
1555 struct ceph_osd_client
*osdc
= &mdsc
->fsc
->client
->osdc
;
1556 struct ceph_cap
*cap
;
1557 LIST_HEAD(tmp_list
);
1558 int num_cap_releases
;
1559 __le32 barrier
, *cap_barrier
;
1561 down_read(&osdc
->lock
);
1562 barrier
= cpu_to_le32(osdc
->epoch_barrier
);
1563 up_read(&osdc
->lock
);
1565 spin_lock(&session
->s_cap_lock
);
1567 list_splice_init(&session
->s_cap_releases
, &tmp_list
);
1568 num_cap_releases
= session
->s_num_cap_releases
;
1569 session
->s_num_cap_releases
= 0;
1570 spin_unlock(&session
->s_cap_lock
);
1572 while (!list_empty(&tmp_list
)) {
1574 msg
= ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE
,
1575 PAGE_SIZE
, GFP_NOFS
, false);
1578 head
= msg
->front
.iov_base
;
1579 head
->num
= cpu_to_le32(0);
1580 msg
->front
.iov_len
= sizeof(*head
);
1582 msg
->hdr
.version
= cpu_to_le16(2);
1583 msg
->hdr
.compat_version
= cpu_to_le16(1);
1586 cap
= list_first_entry(&tmp_list
, struct ceph_cap
,
1588 list_del(&cap
->session_caps
);
1591 head
= msg
->front
.iov_base
;
1592 le32_add_cpu(&head
->num
, 1);
1593 item
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1594 item
->ino
= cpu_to_le64(cap
->cap_ino
);
1595 item
->cap_id
= cpu_to_le64(cap
->cap_id
);
1596 item
->migrate_seq
= cpu_to_le32(cap
->mseq
);
1597 item
->seq
= cpu_to_le32(cap
->issue_seq
);
1598 msg
->front
.iov_len
+= sizeof(*item
);
1600 ceph_put_cap(mdsc
, cap
);
1602 if (le32_to_cpu(head
->num
) == CEPH_CAPS_PER_RELEASE
) {
1603 // Append cap_barrier field
1604 cap_barrier
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1605 *cap_barrier
= barrier
;
1606 msg
->front
.iov_len
+= sizeof(*cap_barrier
);
1608 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1609 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1610 ceph_con_send(&session
->s_con
, msg
);
1615 BUG_ON(num_cap_releases
!= 0);
1617 spin_lock(&session
->s_cap_lock
);
1618 if (!list_empty(&session
->s_cap_releases
))
1620 spin_unlock(&session
->s_cap_lock
);
1623 // Append cap_barrier field
1624 cap_barrier
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1625 *cap_barrier
= barrier
;
1626 msg
->front
.iov_len
+= sizeof(*cap_barrier
);
1628 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
1629 dout("send_cap_releases mds%d %p\n", session
->s_mds
, msg
);
1630 ceph_con_send(&session
->s_con
, msg
);
1634 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1636 spin_lock(&session
->s_cap_lock
);
1637 list_splice(&tmp_list
, &session
->s_cap_releases
);
1638 session
->s_num_cap_releases
+= num_cap_releases
;
1639 spin_unlock(&session
->s_cap_lock
);
1646 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request
*req
,
1649 struct ceph_inode_info
*ci
= ceph_inode(dir
);
1650 struct ceph_mds_reply_info_parsed
*rinfo
= &req
->r_reply_info
;
1651 struct ceph_mount_options
*opt
= req
->r_mdsc
->fsc
->mount_options
;
1652 size_t size
= sizeof(struct ceph_mds_reply_dir_entry
);
1653 int order
, num_entries
;
1655 spin_lock(&ci
->i_ceph_lock
);
1656 num_entries
= ci
->i_files
+ ci
->i_subdirs
;
1657 spin_unlock(&ci
->i_ceph_lock
);
1658 num_entries
= max(num_entries
, 1);
1659 num_entries
= min(num_entries
, opt
->max_readdir
);
1661 order
= get_order(size
* num_entries
);
1662 while (order
>= 0) {
1663 rinfo
->dir_entries
= (void*)__get_free_pages(GFP_KERNEL
|
1666 if (rinfo
->dir_entries
)
1670 if (!rinfo
->dir_entries
)
1673 num_entries
= (PAGE_SIZE
<< order
) / size
;
1674 num_entries
= min(num_entries
, opt
->max_readdir
);
1676 rinfo
->dir_buf_size
= PAGE_SIZE
<< order
;
1677 req
->r_num_caps
= num_entries
+ 1;
1678 req
->r_args
.readdir
.max_entries
= cpu_to_le32(num_entries
);
1679 req
->r_args
.readdir
.max_bytes
= cpu_to_le32(opt
->max_readdir_bytes
);
1684 * Create an mds request.
1686 struct ceph_mds_request
*
1687 ceph_mdsc_create_request(struct ceph_mds_client
*mdsc
, int op
, int mode
)
1689 struct ceph_mds_request
*req
= kzalloc(sizeof(*req
), GFP_NOFS
);
1692 return ERR_PTR(-ENOMEM
);
1694 mutex_init(&req
->r_fill_mutex
);
1696 req
->r_started
= jiffies
;
1697 req
->r_resend_mds
= -1;
1698 INIT_LIST_HEAD(&req
->r_unsafe_dir_item
);
1699 INIT_LIST_HEAD(&req
->r_unsafe_target_item
);
1701 kref_init(&req
->r_kref
);
1702 RB_CLEAR_NODE(&req
->r_node
);
1703 INIT_LIST_HEAD(&req
->r_wait
);
1704 init_completion(&req
->r_completion
);
1705 init_completion(&req
->r_safe_completion
);
1706 INIT_LIST_HEAD(&req
->r_unsafe_item
);
1708 req
->r_stamp
= timespec_trunc(current_kernel_time(), mdsc
->fsc
->sb
->s_time_gran
);
1711 req
->r_direct_mode
= mode
;
1716 * return oldest (lowest) request, tid in request tree, 0 if none.
1718 * called under mdsc->mutex.
1720 static struct ceph_mds_request
*__get_oldest_req(struct ceph_mds_client
*mdsc
)
1722 if (RB_EMPTY_ROOT(&mdsc
->request_tree
))
1724 return rb_entry(rb_first(&mdsc
->request_tree
),
1725 struct ceph_mds_request
, r_node
);
1728 static inline u64
__get_oldest_tid(struct ceph_mds_client
*mdsc
)
1730 return mdsc
->oldest_tid
;
1734 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1735 * on build_path_from_dentry in fs/cifs/dir.c.
1737 * If @stop_on_nosnap, generate path relative to the first non-snapped
1740 * Encode hidden .snap dirs as a double /, i.e.
1741 * foo/.snap/bar -> foo//bar
1743 char *ceph_mdsc_build_path(struct dentry
*dentry
, int *plen
, u64
*base
,
1746 struct dentry
*temp
;
1752 return ERR_PTR(-EINVAL
);
1756 seq
= read_seqbegin(&rename_lock
);
1758 for (temp
= dentry
; !IS_ROOT(temp
);) {
1759 struct inode
*inode
= d_inode(temp
);
1760 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
)
1761 len
++; /* slash only */
1762 else if (stop_on_nosnap
&& inode
&&
1763 ceph_snap(inode
) == CEPH_NOSNAP
)
1766 len
+= 1 + temp
->d_name
.len
;
1767 temp
= temp
->d_parent
;
1771 len
--; /* no leading '/' */
1773 path
= kmalloc(len
+1, GFP_NOFS
);
1775 return ERR_PTR(-ENOMEM
);
1777 path
[pos
] = 0; /* trailing null */
1779 for (temp
= dentry
; !IS_ROOT(temp
) && pos
!= 0; ) {
1780 struct inode
*inode
;
1782 spin_lock(&temp
->d_lock
);
1783 inode
= d_inode(temp
);
1784 if (inode
&& ceph_snap(inode
) == CEPH_SNAPDIR
) {
1785 dout("build_path path+%d: %p SNAPDIR\n",
1787 } else if (stop_on_nosnap
&& inode
&&
1788 ceph_snap(inode
) == CEPH_NOSNAP
) {
1789 spin_unlock(&temp
->d_lock
);
1792 pos
-= temp
->d_name
.len
;
1794 spin_unlock(&temp
->d_lock
);
1797 strncpy(path
+ pos
, temp
->d_name
.name
,
1800 spin_unlock(&temp
->d_lock
);
1803 temp
= temp
->d_parent
;
1806 if (pos
!= 0 || read_seqretry(&rename_lock
, seq
)) {
1807 pr_err("build_path did not end path lookup where "
1808 "expected, namelen is %d, pos is %d\n", len
, pos
);
1809 /* presumably this is only possible if racing with a
1810 rename of one of the parent directories (we can not
1811 lock the dentries above us to prevent this, but
1812 retrying should be harmless) */
1817 *base
= ceph_ino(d_inode(temp
));
1819 dout("build_path on %p %d built %llx '%.*s'\n",
1820 dentry
, d_count(dentry
), *base
, len
, path
);
1824 static int build_dentry_path(struct dentry
*dentry
, struct inode
*dir
,
1825 const char **ppath
, int *ppathlen
, u64
*pino
,
1832 dir
= d_inode_rcu(dentry
->d_parent
);
1833 if (dir
&& ceph_snap(dir
) == CEPH_NOSNAP
) {
1834 *pino
= ceph_ino(dir
);
1836 *ppath
= dentry
->d_name
.name
;
1837 *ppathlen
= dentry
->d_name
.len
;
1841 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1843 return PTR_ERR(path
);
1849 static int build_inode_path(struct inode
*inode
,
1850 const char **ppath
, int *ppathlen
, u64
*pino
,
1853 struct dentry
*dentry
;
1856 if (ceph_snap(inode
) == CEPH_NOSNAP
) {
1857 *pino
= ceph_ino(inode
);
1861 dentry
= d_find_alias(inode
);
1862 path
= ceph_mdsc_build_path(dentry
, ppathlen
, pino
, 1);
1865 return PTR_ERR(path
);
1872 * request arguments may be specified via an inode *, a dentry *, or
1873 * an explicit ino+path.
1875 static int set_request_path_attr(struct inode
*rinode
, struct dentry
*rdentry
,
1876 struct inode
*rdiri
, const char *rpath
,
1877 u64 rino
, const char **ppath
, int *pathlen
,
1878 u64
*ino
, int *freepath
)
1883 r
= build_inode_path(rinode
, ppath
, pathlen
, ino
, freepath
);
1884 dout(" inode %p %llx.%llx\n", rinode
, ceph_ino(rinode
),
1886 } else if (rdentry
) {
1887 r
= build_dentry_path(rdentry
, rdiri
, ppath
, pathlen
, ino
,
1889 dout(" dentry %p %llx/%.*s\n", rdentry
, *ino
, *pathlen
,
1891 } else if (rpath
|| rino
) {
1894 *pathlen
= rpath
? strlen(rpath
) : 0;
1895 dout(" path %.*s\n", *pathlen
, rpath
);
1902 * called under mdsc->mutex
1904 static struct ceph_msg
*create_request_message(struct ceph_mds_client
*mdsc
,
1905 struct ceph_mds_request
*req
,
1906 int mds
, bool drop_cap_releases
)
1908 struct ceph_msg
*msg
;
1909 struct ceph_mds_request_head
*head
;
1910 const char *path1
= NULL
;
1911 const char *path2
= NULL
;
1912 u64 ino1
= 0, ino2
= 0;
1913 int pathlen1
= 0, pathlen2
= 0;
1914 int freepath1
= 0, freepath2
= 0;
1920 ret
= set_request_path_attr(req
->r_inode
, req
->r_dentry
,
1921 req
->r_parent
, req
->r_path1
, req
->r_ino1
.ino
,
1922 &path1
, &pathlen1
, &ino1
, &freepath1
);
1928 ret
= set_request_path_attr(NULL
, req
->r_old_dentry
,
1929 req
->r_old_dentry_dir
,
1930 req
->r_path2
, req
->r_ino2
.ino
,
1931 &path2
, &pathlen2
, &ino2
, &freepath2
);
1937 len
= sizeof(*head
) +
1938 pathlen1
+ pathlen2
+ 2*(1 + sizeof(u32
) + sizeof(u64
)) +
1939 sizeof(struct ceph_timespec
);
1941 /* calculate (max) length for cap releases */
1942 len
+= sizeof(struct ceph_mds_request_release
) *
1943 (!!req
->r_inode_drop
+ !!req
->r_dentry_drop
+
1944 !!req
->r_old_inode_drop
+ !!req
->r_old_dentry_drop
);
1945 if (req
->r_dentry_drop
)
1946 len
+= req
->r_dentry
->d_name
.len
;
1947 if (req
->r_old_dentry_drop
)
1948 len
+= req
->r_old_dentry
->d_name
.len
;
1950 msg
= ceph_msg_new(CEPH_MSG_CLIENT_REQUEST
, len
, GFP_NOFS
, false);
1952 msg
= ERR_PTR(-ENOMEM
);
1956 msg
->hdr
.version
= cpu_to_le16(2);
1957 msg
->hdr
.tid
= cpu_to_le64(req
->r_tid
);
1959 head
= msg
->front
.iov_base
;
1960 p
= msg
->front
.iov_base
+ sizeof(*head
);
1961 end
= msg
->front
.iov_base
+ msg
->front
.iov_len
;
1963 head
->mdsmap_epoch
= cpu_to_le32(mdsc
->mdsmap
->m_epoch
);
1964 head
->op
= cpu_to_le32(req
->r_op
);
1965 head
->caller_uid
= cpu_to_le32(from_kuid(&init_user_ns
, req
->r_uid
));
1966 head
->caller_gid
= cpu_to_le32(from_kgid(&init_user_ns
, req
->r_gid
));
1967 head
->args
= req
->r_args
;
1969 ceph_encode_filepath(&p
, end
, ino1
, path1
);
1970 ceph_encode_filepath(&p
, end
, ino2
, path2
);
1972 /* make note of release offset, in case we need to replay */
1973 req
->r_request_release_offset
= p
- msg
->front
.iov_base
;
1977 if (req
->r_inode_drop
)
1978 releases
+= ceph_encode_inode_release(&p
,
1979 req
->r_inode
? req
->r_inode
: d_inode(req
->r_dentry
),
1980 mds
, req
->r_inode_drop
, req
->r_inode_unless
, 0);
1981 if (req
->r_dentry_drop
)
1982 releases
+= ceph_encode_dentry_release(&p
, req
->r_dentry
,
1983 req
->r_parent
, mds
, req
->r_dentry_drop
,
1984 req
->r_dentry_unless
);
1985 if (req
->r_old_dentry_drop
)
1986 releases
+= ceph_encode_dentry_release(&p
, req
->r_old_dentry
,
1987 req
->r_old_dentry_dir
, mds
,
1988 req
->r_old_dentry_drop
,
1989 req
->r_old_dentry_unless
);
1990 if (req
->r_old_inode_drop
)
1991 releases
+= ceph_encode_inode_release(&p
,
1992 d_inode(req
->r_old_dentry
),
1993 mds
, req
->r_old_inode_drop
, req
->r_old_inode_unless
, 0);
1995 if (drop_cap_releases
) {
1997 p
= msg
->front
.iov_base
+ req
->r_request_release_offset
;
2000 head
->num_releases
= cpu_to_le16(releases
);
2004 struct ceph_timespec ts
;
2005 ceph_encode_timespec(&ts
, &req
->r_stamp
);
2006 ceph_encode_copy(&p
, &ts
, sizeof(ts
));
2010 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
2011 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
2013 if (req
->r_pagelist
) {
2014 struct ceph_pagelist
*pagelist
= req
->r_pagelist
;
2015 refcount_inc(&pagelist
->refcnt
);
2016 ceph_msg_data_add_pagelist(msg
, pagelist
);
2017 msg
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
2019 msg
->hdr
.data_len
= 0;
2022 msg
->hdr
.data_off
= cpu_to_le16(0);
2026 kfree((char *)path2
);
2029 kfree((char *)path1
);
2035 * called under mdsc->mutex if error, under no mutex if
2038 static void complete_request(struct ceph_mds_client
*mdsc
,
2039 struct ceph_mds_request
*req
)
2041 if (req
->r_callback
)
2042 req
->r_callback(mdsc
, req
);
2044 complete_all(&req
->r_completion
);
2048 * called under mdsc->mutex
2050 static int __prepare_send_request(struct ceph_mds_client
*mdsc
,
2051 struct ceph_mds_request
*req
,
2052 int mds
, bool drop_cap_releases
)
2054 struct ceph_mds_request_head
*rhead
;
2055 struct ceph_msg
*msg
;
2060 struct ceph_cap
*cap
=
2061 ceph_get_cap_for_mds(ceph_inode(req
->r_inode
), mds
);
2064 req
->r_sent_on_mseq
= cap
->mseq
;
2066 req
->r_sent_on_mseq
= -1;
2068 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req
,
2069 req
->r_tid
, ceph_mds_op_name(req
->r_op
), req
->r_attempts
);
2071 if (test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
)) {
2074 * Replay. Do not regenerate message (and rebuild
2075 * paths, etc.); just use the original message.
2076 * Rebuilding paths will break for renames because
2077 * d_move mangles the src name.
2079 msg
= req
->r_request
;
2080 rhead
= msg
->front
.iov_base
;
2082 flags
= le32_to_cpu(rhead
->flags
);
2083 flags
|= CEPH_MDS_FLAG_REPLAY
;
2084 rhead
->flags
= cpu_to_le32(flags
);
2086 if (req
->r_target_inode
)
2087 rhead
->ino
= cpu_to_le64(ceph_ino(req
->r_target_inode
));
2089 rhead
->num_retry
= req
->r_attempts
- 1;
2091 /* remove cap/dentry releases from message */
2092 rhead
->num_releases
= 0;
2095 p
= msg
->front
.iov_base
+ req
->r_request_release_offset
;
2097 struct ceph_timespec ts
;
2098 ceph_encode_timespec(&ts
, &req
->r_stamp
);
2099 ceph_encode_copy(&p
, &ts
, sizeof(ts
));
2102 msg
->front
.iov_len
= p
- msg
->front
.iov_base
;
2103 msg
->hdr
.front_len
= cpu_to_le32(msg
->front
.iov_len
);
2107 if (req
->r_request
) {
2108 ceph_msg_put(req
->r_request
);
2109 req
->r_request
= NULL
;
2111 msg
= create_request_message(mdsc
, req
, mds
, drop_cap_releases
);
2113 req
->r_err
= PTR_ERR(msg
);
2114 return PTR_ERR(msg
);
2116 req
->r_request
= msg
;
2118 rhead
= msg
->front
.iov_base
;
2119 rhead
->oldest_client_tid
= cpu_to_le64(__get_oldest_tid(mdsc
));
2120 if (test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
))
2121 flags
|= CEPH_MDS_FLAG_REPLAY
;
2123 flags
|= CEPH_MDS_FLAG_WANT_DENTRY
;
2124 rhead
->flags
= cpu_to_le32(flags
);
2125 rhead
->num_fwd
= req
->r_num_fwd
;
2126 rhead
->num_retry
= req
->r_attempts
- 1;
2129 dout(" r_parent = %p\n", req
->r_parent
);
2134 * send request, or put it on the appropriate wait list.
2136 static int __do_request(struct ceph_mds_client
*mdsc
,
2137 struct ceph_mds_request
*req
)
2139 struct ceph_mds_session
*session
= NULL
;
2143 if (req
->r_err
|| test_bit(CEPH_MDS_R_GOT_RESULT
, &req
->r_req_flags
)) {
2144 if (test_bit(CEPH_MDS_R_ABORTED
, &req
->r_req_flags
))
2145 __unregister_request(mdsc
, req
);
2149 if (req
->r_timeout
&&
2150 time_after_eq(jiffies
, req
->r_started
+ req
->r_timeout
)) {
2151 dout("do_request timed out\n");
2155 if (READ_ONCE(mdsc
->fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
) {
2156 dout("do_request forced umount\n");
2160 if (READ_ONCE(mdsc
->fsc
->mount_state
) == CEPH_MOUNT_MOUNTING
) {
2161 if (mdsc
->mdsmap_err
) {
2162 err
= mdsc
->mdsmap_err
;
2163 dout("do_request mdsmap err %d\n", err
);
2166 if (mdsc
->mdsmap
->m_epoch
== 0) {
2167 dout("do_request no mdsmap, waiting for map\n");
2168 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
2171 if (!(mdsc
->fsc
->mount_options
->flags
&
2172 CEPH_MOUNT_OPT_MOUNTWAIT
) &&
2173 !ceph_mdsmap_is_cluster_available(mdsc
->mdsmap
)) {
2175 pr_info("probably no mds server is up\n");
2180 put_request_session(req
);
2182 mds
= __choose_mds(mdsc
, req
);
2184 ceph_mdsmap_get_state(mdsc
->mdsmap
, mds
) < CEPH_MDS_STATE_ACTIVE
) {
2185 dout("do_request no mds or not active, waiting for map\n");
2186 list_add(&req
->r_wait
, &mdsc
->waiting_for_map
);
2190 /* get, open session */
2191 session
= __ceph_lookup_mds_session(mdsc
, mds
);
2193 session
= register_session(mdsc
, mds
);
2194 if (IS_ERR(session
)) {
2195 err
= PTR_ERR(session
);
2199 req
->r_session
= get_session(session
);
2201 dout("do_request mds%d session %p state %s\n", mds
, session
,
2202 ceph_session_state_name(session
->s_state
));
2203 if (session
->s_state
!= CEPH_MDS_SESSION_OPEN
&&
2204 session
->s_state
!= CEPH_MDS_SESSION_HUNG
) {
2205 if (session
->s_state
== CEPH_MDS_SESSION_REJECTED
) {
2209 if (session
->s_state
== CEPH_MDS_SESSION_NEW
||
2210 session
->s_state
== CEPH_MDS_SESSION_CLOSING
)
2211 __open_session(mdsc
, session
);
2212 list_add(&req
->r_wait
, &session
->s_waiting
);
2217 req
->r_resend_mds
= -1; /* forget any previous mds hint */
2219 if (req
->r_request_started
== 0) /* note request start time */
2220 req
->r_request_started
= jiffies
;
2222 err
= __prepare_send_request(mdsc
, req
, mds
, false);
2224 ceph_msg_get(req
->r_request
);
2225 ceph_con_send(&session
->s_con
, req
->r_request
);
2229 ceph_put_mds_session(session
);
2232 dout("__do_request early error %d\n", err
);
2234 complete_request(mdsc
, req
);
2235 __unregister_request(mdsc
, req
);
2242 * called under mdsc->mutex
2244 static void __wake_requests(struct ceph_mds_client
*mdsc
,
2245 struct list_head
*head
)
2247 struct ceph_mds_request
*req
;
2248 LIST_HEAD(tmp_list
);
2250 list_splice_init(head
, &tmp_list
);
2252 while (!list_empty(&tmp_list
)) {
2253 req
= list_entry(tmp_list
.next
,
2254 struct ceph_mds_request
, r_wait
);
2255 list_del_init(&req
->r_wait
);
2256 dout(" wake request %p tid %llu\n", req
, req
->r_tid
);
2257 __do_request(mdsc
, req
);
2262 * Wake up threads with requests pending for @mds, so that they can
2263 * resubmit their requests to a possibly different mds.
2265 static void kick_requests(struct ceph_mds_client
*mdsc
, int mds
)
2267 struct ceph_mds_request
*req
;
2268 struct rb_node
*p
= rb_first(&mdsc
->request_tree
);
2270 dout("kick_requests mds%d\n", mds
);
2272 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
2274 if (test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
))
2276 if (req
->r_attempts
> 0)
2277 continue; /* only new requests */
2278 if (req
->r_session
&&
2279 req
->r_session
->s_mds
== mds
) {
2280 dout(" kicking tid %llu\n", req
->r_tid
);
2281 list_del_init(&req
->r_wait
);
2282 __do_request(mdsc
, req
);
2287 void ceph_mdsc_submit_request(struct ceph_mds_client
*mdsc
,
2288 struct ceph_mds_request
*req
)
2290 dout("submit_request on %p\n", req
);
2291 mutex_lock(&mdsc
->mutex
);
2292 __register_request(mdsc
, req
, NULL
);
2293 __do_request(mdsc
, req
);
2294 mutex_unlock(&mdsc
->mutex
);
2298 * Synchrously perform an mds request. Take care of all of the
2299 * session setup, forwarding, retry details.
2301 int ceph_mdsc_do_request(struct ceph_mds_client
*mdsc
,
2303 struct ceph_mds_request
*req
)
2307 dout("do_request on %p\n", req
);
2309 /* take CAP_PIN refs for r_inode, r_parent, r_old_dentry */
2311 ceph_get_cap_refs(ceph_inode(req
->r_inode
), CEPH_CAP_PIN
);
2313 ceph_get_cap_refs(ceph_inode(req
->r_parent
), CEPH_CAP_PIN
);
2314 if (req
->r_old_dentry_dir
)
2315 ceph_get_cap_refs(ceph_inode(req
->r_old_dentry_dir
),
2319 mutex_lock(&mdsc
->mutex
);
2320 __register_request(mdsc
, req
, dir
);
2321 __do_request(mdsc
, req
);
2329 mutex_unlock(&mdsc
->mutex
);
2330 dout("do_request waiting\n");
2331 if (!req
->r_timeout
&& req
->r_wait_for_completion
) {
2332 err
= req
->r_wait_for_completion(mdsc
, req
);
2334 long timeleft
= wait_for_completion_killable_timeout(
2336 ceph_timeout_jiffies(req
->r_timeout
));
2340 err
= -EIO
; /* timed out */
2342 err
= timeleft
; /* killed */
2344 dout("do_request waited, got %d\n", err
);
2345 mutex_lock(&mdsc
->mutex
);
2347 /* only abort if we didn't race with a real reply */
2348 if (test_bit(CEPH_MDS_R_GOT_RESULT
, &req
->r_req_flags
)) {
2349 err
= le32_to_cpu(req
->r_reply_info
.head
->result
);
2350 } else if (err
< 0) {
2351 dout("aborted request %lld with %d\n", req
->r_tid
, err
);
2354 * ensure we aren't running concurrently with
2355 * ceph_fill_trace or ceph_readdir_prepopulate, which
2356 * rely on locks (dir mutex) held by our caller.
2358 mutex_lock(&req
->r_fill_mutex
);
2360 set_bit(CEPH_MDS_R_ABORTED
, &req
->r_req_flags
);
2361 mutex_unlock(&req
->r_fill_mutex
);
2363 if (req
->r_parent
&&
2364 (req
->r_op
& CEPH_MDS_OP_WRITE
))
2365 ceph_invalidate_dir_request(req
);
2371 mutex_unlock(&mdsc
->mutex
);
2372 dout("do_request %p done, result %d\n", req
, err
);
2377 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2378 * namespace request.
2380 void ceph_invalidate_dir_request(struct ceph_mds_request
*req
)
2382 struct inode
*inode
= req
->r_parent
;
2384 dout("invalidate_dir_request %p (complete, lease(s))\n", inode
);
2386 ceph_dir_clear_complete(inode
);
2388 ceph_invalidate_dentry_lease(req
->r_dentry
);
2389 if (req
->r_old_dentry
)
2390 ceph_invalidate_dentry_lease(req
->r_old_dentry
);
2396 * We take the session mutex and parse and process the reply immediately.
2397 * This preserves the logical ordering of replies, capabilities, etc., sent
2398 * by the MDS as they are applied to our local cache.
2400 static void handle_reply(struct ceph_mds_session
*session
, struct ceph_msg
*msg
)
2402 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2403 struct ceph_mds_request
*req
;
2404 struct ceph_mds_reply_head
*head
= msg
->front
.iov_base
;
2405 struct ceph_mds_reply_info_parsed
*rinfo
; /* parsed reply info */
2406 struct ceph_snap_realm
*realm
;
2409 int mds
= session
->s_mds
;
2411 if (msg
->front
.iov_len
< sizeof(*head
)) {
2412 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2417 /* get request, session */
2418 tid
= le64_to_cpu(msg
->hdr
.tid
);
2419 mutex_lock(&mdsc
->mutex
);
2420 req
= lookup_get_request(mdsc
, tid
);
2422 dout("handle_reply on unknown tid %llu\n", tid
);
2423 mutex_unlock(&mdsc
->mutex
);
2426 dout("handle_reply %p\n", req
);
2428 /* correct session? */
2429 if (req
->r_session
!= session
) {
2430 pr_err("mdsc_handle_reply got %llu on session mds%d"
2431 " not mds%d\n", tid
, session
->s_mds
,
2432 req
->r_session
? req
->r_session
->s_mds
: -1);
2433 mutex_unlock(&mdsc
->mutex
);
2438 if ((test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
) && !head
->safe
) ||
2439 (test_bit(CEPH_MDS_R_GOT_SAFE
, &req
->r_req_flags
) && head
->safe
)) {
2440 pr_warn("got a dup %s reply on %llu from mds%d\n",
2441 head
->safe
? "safe" : "unsafe", tid
, mds
);
2442 mutex_unlock(&mdsc
->mutex
);
2445 if (test_bit(CEPH_MDS_R_GOT_SAFE
, &req
->r_req_flags
)) {
2446 pr_warn("got unsafe after safe on %llu from mds%d\n",
2448 mutex_unlock(&mdsc
->mutex
);
2452 result
= le32_to_cpu(head
->result
);
2456 * if we're not talking to the authority, send to them
2457 * if the authority has changed while we weren't looking,
2458 * send to new authority
2459 * Otherwise we just have to return an ESTALE
2461 if (result
== -ESTALE
) {
2462 dout("got ESTALE on request %llu", req
->r_tid
);
2463 req
->r_resend_mds
= -1;
2464 if (req
->r_direct_mode
!= USE_AUTH_MDS
) {
2465 dout("not using auth, setting for that now");
2466 req
->r_direct_mode
= USE_AUTH_MDS
;
2467 __do_request(mdsc
, req
);
2468 mutex_unlock(&mdsc
->mutex
);
2471 int mds
= __choose_mds(mdsc
, req
);
2472 if (mds
>= 0 && mds
!= req
->r_session
->s_mds
) {
2473 dout("but auth changed, so resending");
2474 __do_request(mdsc
, req
);
2475 mutex_unlock(&mdsc
->mutex
);
2479 dout("have to return ESTALE on request %llu", req
->r_tid
);
2484 set_bit(CEPH_MDS_R_GOT_SAFE
, &req
->r_req_flags
);
2485 __unregister_request(mdsc
, req
);
2487 if (test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
)) {
2489 * We already handled the unsafe response, now do the
2490 * cleanup. No need to examine the response; the MDS
2491 * doesn't include any result info in the safe
2492 * response. And even if it did, there is nothing
2493 * useful we could do with a revised return value.
2495 dout("got safe reply %llu, mds%d\n", tid
, mds
);
2497 /* last unsafe request during umount? */
2498 if (mdsc
->stopping
&& !__get_oldest_req(mdsc
))
2499 complete_all(&mdsc
->safe_umount_waiters
);
2500 mutex_unlock(&mdsc
->mutex
);
2504 set_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
);
2505 list_add_tail(&req
->r_unsafe_item
, &req
->r_session
->s_unsafe
);
2506 if (req
->r_unsafe_dir
) {
2507 struct ceph_inode_info
*ci
=
2508 ceph_inode(req
->r_unsafe_dir
);
2509 spin_lock(&ci
->i_unsafe_lock
);
2510 list_add_tail(&req
->r_unsafe_dir_item
,
2511 &ci
->i_unsafe_dirops
);
2512 spin_unlock(&ci
->i_unsafe_lock
);
2516 dout("handle_reply tid %lld result %d\n", tid
, result
);
2517 rinfo
= &req
->r_reply_info
;
2518 err
= parse_reply_info(msg
, rinfo
, session
->s_con
.peer_features
);
2519 mutex_unlock(&mdsc
->mutex
);
2521 mutex_lock(&session
->s_mutex
);
2523 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds
, tid
);
2530 if (rinfo
->snapblob_len
) {
2531 down_write(&mdsc
->snap_rwsem
);
2532 ceph_update_snap_trace(mdsc
, rinfo
->snapblob
,
2533 rinfo
->snapblob
+ rinfo
->snapblob_len
,
2534 le32_to_cpu(head
->op
) == CEPH_MDS_OP_RMSNAP
,
2536 downgrade_write(&mdsc
->snap_rwsem
);
2538 down_read(&mdsc
->snap_rwsem
);
2541 /* insert trace into our cache */
2542 mutex_lock(&req
->r_fill_mutex
);
2543 current
->journal_info
= req
;
2544 err
= ceph_fill_trace(mdsc
->fsc
->sb
, req
);
2546 if (result
== 0 && (req
->r_op
== CEPH_MDS_OP_READDIR
||
2547 req
->r_op
== CEPH_MDS_OP_LSSNAP
))
2548 ceph_readdir_prepopulate(req
, req
->r_session
);
2549 ceph_unreserve_caps(mdsc
, &req
->r_caps_reservation
);
2551 current
->journal_info
= NULL
;
2552 mutex_unlock(&req
->r_fill_mutex
);
2554 up_read(&mdsc
->snap_rwsem
);
2556 ceph_put_snap_realm(mdsc
, realm
);
2558 if (err
== 0 && req
->r_target_inode
&&
2559 test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
)) {
2560 struct ceph_inode_info
*ci
= ceph_inode(req
->r_target_inode
);
2561 spin_lock(&ci
->i_unsafe_lock
);
2562 list_add_tail(&req
->r_unsafe_target_item
, &ci
->i_unsafe_iops
);
2563 spin_unlock(&ci
->i_unsafe_lock
);
2566 mutex_lock(&mdsc
->mutex
);
2567 if (!test_bit(CEPH_MDS_R_ABORTED
, &req
->r_req_flags
)) {
2571 req
->r_reply
= ceph_msg_get(msg
);
2572 set_bit(CEPH_MDS_R_GOT_RESULT
, &req
->r_req_flags
);
2575 dout("reply arrived after request %lld was aborted\n", tid
);
2577 mutex_unlock(&mdsc
->mutex
);
2579 mutex_unlock(&session
->s_mutex
);
2581 /* kick calling process */
2582 complete_request(mdsc
, req
);
2584 ceph_mdsc_put_request(req
);
2591 * handle mds notification that our request has been forwarded.
2593 static void handle_forward(struct ceph_mds_client
*mdsc
,
2594 struct ceph_mds_session
*session
,
2595 struct ceph_msg
*msg
)
2597 struct ceph_mds_request
*req
;
2598 u64 tid
= le64_to_cpu(msg
->hdr
.tid
);
2602 void *p
= msg
->front
.iov_base
;
2603 void *end
= p
+ msg
->front
.iov_len
;
2605 ceph_decode_need(&p
, end
, 2*sizeof(u32
), bad
);
2606 next_mds
= ceph_decode_32(&p
);
2607 fwd_seq
= ceph_decode_32(&p
);
2609 mutex_lock(&mdsc
->mutex
);
2610 req
= lookup_get_request(mdsc
, tid
);
2612 dout("forward tid %llu to mds%d - req dne\n", tid
, next_mds
);
2613 goto out
; /* dup reply? */
2616 if (test_bit(CEPH_MDS_R_ABORTED
, &req
->r_req_flags
)) {
2617 dout("forward tid %llu aborted, unregistering\n", tid
);
2618 __unregister_request(mdsc
, req
);
2619 } else if (fwd_seq
<= req
->r_num_fwd
) {
2620 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2621 tid
, next_mds
, req
->r_num_fwd
, fwd_seq
);
2623 /* resend. forward race not possible; mds would drop */
2624 dout("forward tid %llu to mds%d (we resend)\n", tid
, next_mds
);
2626 BUG_ON(test_bit(CEPH_MDS_R_GOT_RESULT
, &req
->r_req_flags
));
2627 req
->r_attempts
= 0;
2628 req
->r_num_fwd
= fwd_seq
;
2629 req
->r_resend_mds
= next_mds
;
2630 put_request_session(req
);
2631 __do_request(mdsc
, req
);
2633 ceph_mdsc_put_request(req
);
2635 mutex_unlock(&mdsc
->mutex
);
2639 pr_err("mdsc_handle_forward decode error err=%d\n", err
);
2643 * handle a mds session control message
2645 static void handle_session(struct ceph_mds_session
*session
,
2646 struct ceph_msg
*msg
)
2648 struct ceph_mds_client
*mdsc
= session
->s_mdsc
;
2651 int mds
= session
->s_mds
;
2652 struct ceph_mds_session_head
*h
= msg
->front
.iov_base
;
2656 if (msg
->front
.iov_len
!= sizeof(*h
))
2658 op
= le32_to_cpu(h
->op
);
2659 seq
= le64_to_cpu(h
->seq
);
2661 mutex_lock(&mdsc
->mutex
);
2662 if (op
== CEPH_SESSION_CLOSE
) {
2663 get_session(session
);
2664 __unregister_session(mdsc
, session
);
2666 /* FIXME: this ttl calculation is generous */
2667 session
->s_ttl
= jiffies
+ HZ
*mdsc
->mdsmap
->m_session_autoclose
;
2668 mutex_unlock(&mdsc
->mutex
);
2670 mutex_lock(&session
->s_mutex
);
2672 dout("handle_session mds%d %s %p state %s seq %llu\n",
2673 mds
, ceph_session_op_name(op
), session
,
2674 ceph_session_state_name(session
->s_state
), seq
);
2676 if (session
->s_state
== CEPH_MDS_SESSION_HUNG
) {
2677 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2678 pr_info("mds%d came back\n", session
->s_mds
);
2682 case CEPH_SESSION_OPEN
:
2683 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2684 pr_info("mds%d reconnect success\n", session
->s_mds
);
2685 session
->s_state
= CEPH_MDS_SESSION_OPEN
;
2686 renewed_caps(mdsc
, session
, 0);
2689 __close_session(mdsc
, session
);
2692 case CEPH_SESSION_RENEWCAPS
:
2693 if (session
->s_renew_seq
== seq
)
2694 renewed_caps(mdsc
, session
, 1);
2697 case CEPH_SESSION_CLOSE
:
2698 if (session
->s_state
== CEPH_MDS_SESSION_RECONNECTING
)
2699 pr_info("mds%d reconnect denied\n", session
->s_mds
);
2700 cleanup_session_requests(mdsc
, session
);
2701 remove_session_caps(session
);
2702 wake
= 2; /* for good measure */
2703 wake_up_all(&mdsc
->session_close_wq
);
2706 case CEPH_SESSION_STALE
:
2707 pr_info("mds%d caps went stale, renewing\n",
2709 spin_lock(&session
->s_gen_ttl_lock
);
2710 session
->s_cap_gen
++;
2711 session
->s_cap_ttl
= jiffies
- 1;
2712 spin_unlock(&session
->s_gen_ttl_lock
);
2713 send_renew_caps(mdsc
, session
);
2716 case CEPH_SESSION_RECALL_STATE
:
2717 trim_caps(mdsc
, session
, le32_to_cpu(h
->max_caps
));
2720 case CEPH_SESSION_FLUSHMSG
:
2721 send_flushmsg_ack(mdsc
, session
, seq
);
2724 case CEPH_SESSION_FORCE_RO
:
2725 dout("force_session_readonly %p\n", session
);
2726 spin_lock(&session
->s_cap_lock
);
2727 session
->s_readonly
= true;
2728 spin_unlock(&session
->s_cap_lock
);
2729 wake_up_session_caps(session
, 0);
2732 case CEPH_SESSION_REJECT
:
2733 WARN_ON(session
->s_state
!= CEPH_MDS_SESSION_OPENING
);
2734 pr_info("mds%d rejected session\n", session
->s_mds
);
2735 session
->s_state
= CEPH_MDS_SESSION_REJECTED
;
2736 cleanup_session_requests(mdsc
, session
);
2737 remove_session_caps(session
);
2738 wake
= 2; /* for good measure */
2742 pr_err("mdsc_handle_session bad op %d mds%d\n", op
, mds
);
2746 mutex_unlock(&session
->s_mutex
);
2748 mutex_lock(&mdsc
->mutex
);
2749 __wake_requests(mdsc
, &session
->s_waiting
);
2751 kick_requests(mdsc
, mds
);
2752 mutex_unlock(&mdsc
->mutex
);
2754 if (op
== CEPH_SESSION_CLOSE
)
2755 ceph_put_mds_session(session
);
2759 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds
,
2760 (int)msg
->front
.iov_len
);
2767 * called under session->mutex.
2769 static void replay_unsafe_requests(struct ceph_mds_client
*mdsc
,
2770 struct ceph_mds_session
*session
)
2772 struct ceph_mds_request
*req
, *nreq
;
2776 dout("replay_unsafe_requests mds%d\n", session
->s_mds
);
2778 mutex_lock(&mdsc
->mutex
);
2779 list_for_each_entry_safe(req
, nreq
, &session
->s_unsafe
, r_unsafe_item
) {
2780 err
= __prepare_send_request(mdsc
, req
, session
->s_mds
, true);
2782 ceph_msg_get(req
->r_request
);
2783 ceph_con_send(&session
->s_con
, req
->r_request
);
2788 * also re-send old requests when MDS enters reconnect stage. So that MDS
2789 * can process completed request in clientreplay stage.
2791 p
= rb_first(&mdsc
->request_tree
);
2793 req
= rb_entry(p
, struct ceph_mds_request
, r_node
);
2795 if (test_bit(CEPH_MDS_R_GOT_UNSAFE
, &req
->r_req_flags
))
2797 if (req
->r_attempts
== 0)
2798 continue; /* only old requests */
2799 if (req
->r_session
&&
2800 req
->r_session
->s_mds
== session
->s_mds
) {
2801 err
= __prepare_send_request(mdsc
, req
,
2802 session
->s_mds
, true);
2804 ceph_msg_get(req
->r_request
);
2805 ceph_con_send(&session
->s_con
, req
->r_request
);
2809 mutex_unlock(&mdsc
->mutex
);
2813 * Encode information about a cap for a reconnect with the MDS.
2815 static int encode_caps_cb(struct inode
*inode
, struct ceph_cap
*cap
,
2819 struct ceph_mds_cap_reconnect v2
;
2820 struct ceph_mds_cap_reconnect_v1 v1
;
2822 struct ceph_inode_info
*ci
;
2823 struct ceph_reconnect_state
*recon_state
= arg
;
2824 struct ceph_pagelist
*pagelist
= recon_state
->pagelist
;
2829 struct dentry
*dentry
;
2833 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2834 inode
, ceph_vinop(inode
), cap
, cap
->cap_id
,
2835 ceph_cap_string(cap
->issued
));
2836 err
= ceph_pagelist_encode_64(pagelist
, ceph_ino(inode
));
2840 dentry
= d_find_alias(inode
);
2842 path
= ceph_mdsc_build_path(dentry
, &pathlen
, &pathbase
, 0);
2844 err
= PTR_ERR(path
);
2853 spin_lock(&ci
->i_ceph_lock
);
2854 cap
->seq
= 0; /* reset cap seq */
2855 cap
->issue_seq
= 0; /* and issue_seq */
2856 cap
->mseq
= 0; /* and migrate_seq */
2857 cap
->cap_gen
= cap
->session
->s_cap_gen
;
2859 if (recon_state
->msg_version
>= 2) {
2860 rec
.v2
.cap_id
= cpu_to_le64(cap
->cap_id
);
2861 rec
.v2
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2862 rec
.v2
.issued
= cpu_to_le32(cap
->issued
);
2863 rec
.v2
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2864 rec
.v2
.pathbase
= cpu_to_le64(pathbase
);
2865 rec
.v2
.flock_len
= 0;
2867 rec
.v1
.cap_id
= cpu_to_le64(cap
->cap_id
);
2868 rec
.v1
.wanted
= cpu_to_le32(__ceph_caps_wanted(ci
));
2869 rec
.v1
.issued
= cpu_to_le32(cap
->issued
);
2870 rec
.v1
.size
= cpu_to_le64(inode
->i_size
);
2871 ceph_encode_timespec(&rec
.v1
.mtime
, &inode
->i_mtime
);
2872 ceph_encode_timespec(&rec
.v1
.atime
, &inode
->i_atime
);
2873 rec
.v1
.snaprealm
= cpu_to_le64(ci
->i_snap_realm
->ino
);
2874 rec
.v1
.pathbase
= cpu_to_le64(pathbase
);
2877 if (list_empty(&ci
->i_cap_snaps
)) {
2880 struct ceph_cap_snap
*capsnap
=
2881 list_first_entry(&ci
->i_cap_snaps
,
2882 struct ceph_cap_snap
, ci_item
);
2883 snap_follows
= capsnap
->follows
;
2885 spin_unlock(&ci
->i_ceph_lock
);
2887 if (recon_state
->msg_version
>= 2) {
2888 int num_fcntl_locks
, num_flock_locks
;
2889 struct ceph_filelock
*flocks
;
2890 size_t struct_len
, total_len
= 0;
2894 ceph_count_locks(inode
, &num_fcntl_locks
, &num_flock_locks
);
2895 flocks
= kmalloc((num_fcntl_locks
+num_flock_locks
) *
2896 sizeof(struct ceph_filelock
), GFP_NOFS
);
2901 err
= ceph_encode_locks_to_buffer(inode
, flocks
,
2911 if (recon_state
->msg_version
>= 3) {
2912 /* version, compat_version and struct_len */
2913 total_len
= 2 * sizeof(u8
) + sizeof(u32
);
2917 * number of encoded locks is stable, so copy to pagelist
2919 struct_len
= 2 * sizeof(u32
) +
2920 (num_fcntl_locks
+ num_flock_locks
) *
2921 sizeof(struct ceph_filelock
);
2922 rec
.v2
.flock_len
= cpu_to_le32(struct_len
);
2924 struct_len
+= sizeof(rec
.v2
);
2925 struct_len
+= sizeof(u32
) + pathlen
;
2928 struct_len
+= sizeof(u64
); /* snap_follows */
2930 total_len
+= struct_len
;
2931 err
= ceph_pagelist_reserve(pagelist
, total_len
);
2934 if (recon_state
->msg_version
>= 3) {
2935 ceph_pagelist_encode_8(pagelist
, struct_v
);
2936 ceph_pagelist_encode_8(pagelist
, 1);
2937 ceph_pagelist_encode_32(pagelist
, struct_len
);
2939 ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2940 ceph_pagelist_append(pagelist
, &rec
, sizeof(rec
.v2
));
2941 ceph_locks_to_pagelist(flocks
, pagelist
,
2945 ceph_pagelist_encode_64(pagelist
, snap_follows
);
2949 size_t size
= sizeof(u32
) + pathlen
+ sizeof(rec
.v1
);
2950 err
= ceph_pagelist_reserve(pagelist
, size
);
2952 ceph_pagelist_encode_string(pagelist
, path
, pathlen
);
2953 ceph_pagelist_append(pagelist
, &rec
, sizeof(rec
.v1
));
2957 recon_state
->nr_caps
++;
2967 * If an MDS fails and recovers, clients need to reconnect in order to
2968 * reestablish shared state. This includes all caps issued through
2969 * this session _and_ the snap_realm hierarchy. Because it's not
2970 * clear which snap realms the mds cares about, we send everything we
2971 * know about.. that ensures we'll then get any new info the
2972 * recovering MDS might have.
2974 * This is a relatively heavyweight operation, but it's rare.
2976 * called with mdsc->mutex held.
2978 static void send_mds_reconnect(struct ceph_mds_client
*mdsc
,
2979 struct ceph_mds_session
*session
)
2981 struct ceph_msg
*reply
;
2983 int mds
= session
->s_mds
;
2986 struct ceph_pagelist
*pagelist
;
2987 struct ceph_reconnect_state recon_state
;
2989 pr_info("mds%d reconnect start\n", mds
);
2991 pagelist
= kmalloc(sizeof(*pagelist
), GFP_NOFS
);
2993 goto fail_nopagelist
;
2994 ceph_pagelist_init(pagelist
);
2996 reply
= ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT
, 0, GFP_NOFS
, false);
3000 mutex_lock(&session
->s_mutex
);
3001 session
->s_state
= CEPH_MDS_SESSION_RECONNECTING
;
3004 dout("session %p state %s\n", session
,
3005 ceph_session_state_name(session
->s_state
));
3007 spin_lock(&session
->s_gen_ttl_lock
);
3008 session
->s_cap_gen
++;
3009 spin_unlock(&session
->s_gen_ttl_lock
);
3011 spin_lock(&session
->s_cap_lock
);
3012 /* don't know if session is readonly */
3013 session
->s_readonly
= 0;
3015 * notify __ceph_remove_cap() that we are composing cap reconnect.
3016 * If a cap get released before being added to the cap reconnect,
3017 * __ceph_remove_cap() should skip queuing cap release.
3019 session
->s_cap_reconnect
= 1;
3020 /* drop old cap expires; we're about to reestablish that state */
3021 cleanup_cap_releases(mdsc
, session
);
3023 /* trim unused caps to reduce MDS's cache rejoin time */
3024 if (mdsc
->fsc
->sb
->s_root
)
3025 shrink_dcache_parent(mdsc
->fsc
->sb
->s_root
);
3027 ceph_con_close(&session
->s_con
);
3028 ceph_con_open(&session
->s_con
,
3029 CEPH_ENTITY_TYPE_MDS
, mds
,
3030 ceph_mdsmap_get_addr(mdsc
->mdsmap
, mds
));
3032 /* replay unsafe requests */
3033 replay_unsafe_requests(mdsc
, session
);
3035 down_read(&mdsc
->snap_rwsem
);
3037 /* traverse this session's caps */
3038 s_nr_caps
= session
->s_nr_caps
;
3039 err
= ceph_pagelist_encode_32(pagelist
, s_nr_caps
);
3043 recon_state
.nr_caps
= 0;
3044 recon_state
.pagelist
= pagelist
;
3045 if (session
->s_con
.peer_features
& CEPH_FEATURE_MDSENC
)
3046 recon_state
.msg_version
= 3;
3047 else if (session
->s_con
.peer_features
& CEPH_FEATURE_FLOCK
)
3048 recon_state
.msg_version
= 2;
3050 recon_state
.msg_version
= 1;
3051 err
= iterate_session_caps(session
, encode_caps_cb
, &recon_state
);
3055 spin_lock(&session
->s_cap_lock
);
3056 session
->s_cap_reconnect
= 0;
3057 spin_unlock(&session
->s_cap_lock
);
3060 * snaprealms. we provide mds with the ino, seq (version), and
3061 * parent for all of our realms. If the mds has any newer info,
3064 for (p
= rb_first(&mdsc
->snap_realms
); p
; p
= rb_next(p
)) {
3065 struct ceph_snap_realm
*realm
=
3066 rb_entry(p
, struct ceph_snap_realm
, node
);
3067 struct ceph_mds_snaprealm_reconnect sr_rec
;
3069 dout(" adding snap realm %llx seq %lld parent %llx\n",
3070 realm
->ino
, realm
->seq
, realm
->parent_ino
);
3071 sr_rec
.ino
= cpu_to_le64(realm
->ino
);
3072 sr_rec
.seq
= cpu_to_le64(realm
->seq
);
3073 sr_rec
.parent
= cpu_to_le64(realm
->parent_ino
);
3074 err
= ceph_pagelist_append(pagelist
, &sr_rec
, sizeof(sr_rec
));
3079 reply
->hdr
.version
= cpu_to_le16(recon_state
.msg_version
);
3081 /* raced with cap release? */
3082 if (s_nr_caps
!= recon_state
.nr_caps
) {
3083 struct page
*page
= list_first_entry(&pagelist
->head
,
3085 __le32
*addr
= kmap_atomic(page
);
3086 *addr
= cpu_to_le32(recon_state
.nr_caps
);
3087 kunmap_atomic(addr
);
3090 reply
->hdr
.data_len
= cpu_to_le32(pagelist
->length
);
3091 ceph_msg_data_add_pagelist(reply
, pagelist
);
3093 ceph_early_kick_flushing_caps(mdsc
, session
);
3095 ceph_con_send(&session
->s_con
, reply
);
3097 mutex_unlock(&session
->s_mutex
);
3099 mutex_lock(&mdsc
->mutex
);
3100 __wake_requests(mdsc
, &session
->s_waiting
);
3101 mutex_unlock(&mdsc
->mutex
);
3103 up_read(&mdsc
->snap_rwsem
);
3107 ceph_msg_put(reply
);
3108 up_read(&mdsc
->snap_rwsem
);
3109 mutex_unlock(&session
->s_mutex
);
3111 ceph_pagelist_release(pagelist
);
3113 pr_err("error %d preparing reconnect for mds%d\n", err
, mds
);
3119 * compare old and new mdsmaps, kicking requests
3120 * and closing out old connections as necessary
3122 * called under mdsc->mutex.
3124 static void check_new_map(struct ceph_mds_client
*mdsc
,
3125 struct ceph_mdsmap
*newmap
,
3126 struct ceph_mdsmap
*oldmap
)
3129 int oldstate
, newstate
;
3130 struct ceph_mds_session
*s
;
3132 dout("check_new_map new %u old %u\n",
3133 newmap
->m_epoch
, oldmap
->m_epoch
);
3135 for (i
= 0; i
< oldmap
->m_num_mds
&& i
< mdsc
->max_sessions
; i
++) {
3136 if (mdsc
->sessions
[i
] == NULL
)
3138 s
= mdsc
->sessions
[i
];
3139 oldstate
= ceph_mdsmap_get_state(oldmap
, i
);
3140 newstate
= ceph_mdsmap_get_state(newmap
, i
);
3142 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3143 i
, ceph_mds_state_name(oldstate
),
3144 ceph_mdsmap_is_laggy(oldmap
, i
) ? " (laggy)" : "",
3145 ceph_mds_state_name(newstate
),
3146 ceph_mdsmap_is_laggy(newmap
, i
) ? " (laggy)" : "",
3147 ceph_session_state_name(s
->s_state
));
3149 if (i
>= newmap
->m_num_mds
||
3150 memcmp(ceph_mdsmap_get_addr(oldmap
, i
),
3151 ceph_mdsmap_get_addr(newmap
, i
),
3152 sizeof(struct ceph_entity_addr
))) {
3153 if (s
->s_state
== CEPH_MDS_SESSION_OPENING
) {
3154 /* the session never opened, just close it
3157 __unregister_session(mdsc
, s
);
3158 __wake_requests(mdsc
, &s
->s_waiting
);
3159 ceph_put_mds_session(s
);
3160 } else if (i
>= newmap
->m_num_mds
) {
3161 /* force close session for stopped mds */
3163 __unregister_session(mdsc
, s
);
3164 __wake_requests(mdsc
, &s
->s_waiting
);
3165 kick_requests(mdsc
, i
);
3166 mutex_unlock(&mdsc
->mutex
);
3168 mutex_lock(&s
->s_mutex
);
3169 cleanup_session_requests(mdsc
, s
);
3170 remove_session_caps(s
);
3171 mutex_unlock(&s
->s_mutex
);
3173 ceph_put_mds_session(s
);
3175 mutex_lock(&mdsc
->mutex
);
3178 mutex_unlock(&mdsc
->mutex
);
3179 mutex_lock(&s
->s_mutex
);
3180 mutex_lock(&mdsc
->mutex
);
3181 ceph_con_close(&s
->s_con
);
3182 mutex_unlock(&s
->s_mutex
);
3183 s
->s_state
= CEPH_MDS_SESSION_RESTARTING
;
3185 } else if (oldstate
== newstate
) {
3186 continue; /* nothing new with this mds */
3192 if (s
->s_state
== CEPH_MDS_SESSION_RESTARTING
&&
3193 newstate
>= CEPH_MDS_STATE_RECONNECT
) {
3194 mutex_unlock(&mdsc
->mutex
);
3195 send_mds_reconnect(mdsc
, s
);
3196 mutex_lock(&mdsc
->mutex
);
3200 * kick request on any mds that has gone active.
3202 if (oldstate
< CEPH_MDS_STATE_ACTIVE
&&
3203 newstate
>= CEPH_MDS_STATE_ACTIVE
) {
3204 if (oldstate
!= CEPH_MDS_STATE_CREATING
&&
3205 oldstate
!= CEPH_MDS_STATE_STARTING
)
3206 pr_info("mds%d recovery completed\n", s
->s_mds
);
3207 kick_requests(mdsc
, i
);
3208 ceph_kick_flushing_caps(mdsc
, s
);
3209 wake_up_session_caps(s
, 1);
3213 for (i
= 0; i
< newmap
->m_num_mds
&& i
< mdsc
->max_sessions
; i
++) {
3214 s
= mdsc
->sessions
[i
];
3217 if (!ceph_mdsmap_is_laggy(newmap
, i
))
3219 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3220 s
->s_state
== CEPH_MDS_SESSION_HUNG
||
3221 s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3222 dout(" connecting to export targets of laggy mds%d\n",
3224 __open_export_target_sessions(mdsc
, s
);
3236 * caller must hold session s_mutex, dentry->d_lock
3238 void __ceph_mdsc_drop_dentry_lease(struct dentry
*dentry
)
3240 struct ceph_dentry_info
*di
= ceph_dentry(dentry
);
3242 ceph_put_mds_session(di
->lease_session
);
3243 di
->lease_session
= NULL
;
3246 static void handle_lease(struct ceph_mds_client
*mdsc
,
3247 struct ceph_mds_session
*session
,
3248 struct ceph_msg
*msg
)
3250 struct super_block
*sb
= mdsc
->fsc
->sb
;
3251 struct inode
*inode
;
3252 struct dentry
*parent
, *dentry
;
3253 struct ceph_dentry_info
*di
;
3254 int mds
= session
->s_mds
;
3255 struct ceph_mds_lease
*h
= msg
->front
.iov_base
;
3257 struct ceph_vino vino
;
3261 dout("handle_lease from mds%d\n", mds
);
3264 if (msg
->front
.iov_len
< sizeof(*h
) + sizeof(u32
))
3266 vino
.ino
= le64_to_cpu(h
->ino
);
3267 vino
.snap
= CEPH_NOSNAP
;
3268 seq
= le32_to_cpu(h
->seq
);
3269 dname
.name
= (void *)h
+ sizeof(*h
) + sizeof(u32
);
3270 dname
.len
= msg
->front
.iov_len
- sizeof(*h
) - sizeof(u32
);
3271 if (dname
.len
!= get_unaligned_le32(h
+1))
3275 inode
= ceph_find_inode(sb
, vino
);
3276 dout("handle_lease %s, ino %llx %p %.*s\n",
3277 ceph_lease_op_name(h
->action
), vino
.ino
, inode
,
3278 dname
.len
, dname
.name
);
3280 mutex_lock(&session
->s_mutex
);
3283 if (inode
== NULL
) {
3284 dout("handle_lease no inode %llx\n", vino
.ino
);
3289 parent
= d_find_alias(inode
);
3291 dout("no parent dentry on inode %p\n", inode
);
3293 goto release
; /* hrm... */
3295 dname
.hash
= full_name_hash(parent
, dname
.name
, dname
.len
);
3296 dentry
= d_lookup(parent
, &dname
);
3301 spin_lock(&dentry
->d_lock
);
3302 di
= ceph_dentry(dentry
);
3303 switch (h
->action
) {
3304 case CEPH_MDS_LEASE_REVOKE
:
3305 if (di
->lease_session
== session
) {
3306 if (ceph_seq_cmp(di
->lease_seq
, seq
) > 0)
3307 h
->seq
= cpu_to_le32(di
->lease_seq
);
3308 __ceph_mdsc_drop_dentry_lease(dentry
);
3313 case CEPH_MDS_LEASE_RENEW
:
3314 if (di
->lease_session
== session
&&
3315 di
->lease_gen
== session
->s_cap_gen
&&
3316 di
->lease_renew_from
&&
3317 di
->lease_renew_after
== 0) {
3318 unsigned long duration
=
3319 msecs_to_jiffies(le32_to_cpu(h
->duration_ms
));
3321 di
->lease_seq
= seq
;
3322 di
->time
= di
->lease_renew_from
+ duration
;
3323 di
->lease_renew_after
= di
->lease_renew_from
+
3325 di
->lease_renew_from
= 0;
3329 spin_unlock(&dentry
->d_lock
);
3336 /* let's just reuse the same message */
3337 h
->action
= CEPH_MDS_LEASE_REVOKE_ACK
;
3339 ceph_con_send(&session
->s_con
, msg
);
3343 mutex_unlock(&session
->s_mutex
);
3347 pr_err("corrupt lease message\n");
3351 void ceph_mdsc_lease_send_msg(struct ceph_mds_session
*session
,
3352 struct inode
*inode
,
3353 struct dentry
*dentry
, char action
,
3356 struct ceph_msg
*msg
;
3357 struct ceph_mds_lease
*lease
;
3358 int len
= sizeof(*lease
) + sizeof(u32
);
3361 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3362 inode
, dentry
, ceph_lease_op_name(action
), session
->s_mds
);
3363 dnamelen
= dentry
->d_name
.len
;
3366 msg
= ceph_msg_new(CEPH_MSG_CLIENT_LEASE
, len
, GFP_NOFS
, false);
3369 lease
= msg
->front
.iov_base
;
3370 lease
->action
= action
;
3371 lease
->ino
= cpu_to_le64(ceph_vino(inode
).ino
);
3372 lease
->first
= lease
->last
= cpu_to_le64(ceph_vino(inode
).snap
);
3373 lease
->seq
= cpu_to_le32(seq
);
3374 put_unaligned_le32(dnamelen
, lease
+ 1);
3375 memcpy((void *)(lease
+ 1) + 4, dentry
->d_name
.name
, dnamelen
);
3378 * if this is a preemptive lease RELEASE, no need to
3379 * flush request stream, since the actual request will
3382 msg
->more_to_follow
= (action
== CEPH_MDS_LEASE_RELEASE
);
3384 ceph_con_send(&session
->s_con
, msg
);
3388 * drop all leases (and dentry refs) in preparation for umount
3390 static void drop_leases(struct ceph_mds_client
*mdsc
)
3394 dout("drop_leases\n");
3395 mutex_lock(&mdsc
->mutex
);
3396 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3397 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3400 mutex_unlock(&mdsc
->mutex
);
3401 mutex_lock(&s
->s_mutex
);
3402 mutex_unlock(&s
->s_mutex
);
3403 ceph_put_mds_session(s
);
3404 mutex_lock(&mdsc
->mutex
);
3406 mutex_unlock(&mdsc
->mutex
);
3412 * delayed work -- periodically trim expired leases, renew caps with mds
3414 static void schedule_delayed(struct ceph_mds_client
*mdsc
)
3417 unsigned hz
= round_jiffies_relative(HZ
* delay
);
3418 schedule_delayed_work(&mdsc
->delayed_work
, hz
);
3421 static void delayed_work(struct work_struct
*work
)
3424 struct ceph_mds_client
*mdsc
=
3425 container_of(work
, struct ceph_mds_client
, delayed_work
.work
);
3429 dout("mdsc delayed_work\n");
3430 ceph_check_delayed_caps(mdsc
);
3432 mutex_lock(&mdsc
->mutex
);
3433 renew_interval
= mdsc
->mdsmap
->m_session_timeout
>> 2;
3434 renew_caps
= time_after_eq(jiffies
, HZ
*renew_interval
+
3435 mdsc
->last_renew_caps
);
3437 mdsc
->last_renew_caps
= jiffies
;
3439 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3440 struct ceph_mds_session
*s
= __ceph_lookup_mds_session(mdsc
, i
);
3443 if (s
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3444 dout("resending session close request for mds%d\n",
3446 request_close_session(mdsc
, s
);
3447 ceph_put_mds_session(s
);
3450 if (s
->s_ttl
&& time_after(jiffies
, s
->s_ttl
)) {
3451 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
) {
3452 s
->s_state
= CEPH_MDS_SESSION_HUNG
;
3453 pr_info("mds%d hung\n", s
->s_mds
);
3456 if (s
->s_state
< CEPH_MDS_SESSION_OPEN
) {
3457 /* this mds is failed or recovering, just wait */
3458 ceph_put_mds_session(s
);
3461 mutex_unlock(&mdsc
->mutex
);
3463 mutex_lock(&s
->s_mutex
);
3465 send_renew_caps(mdsc
, s
);
3467 ceph_con_keepalive(&s
->s_con
);
3468 if (s
->s_state
== CEPH_MDS_SESSION_OPEN
||
3469 s
->s_state
== CEPH_MDS_SESSION_HUNG
)
3470 ceph_send_cap_releases(mdsc
, s
);
3471 mutex_unlock(&s
->s_mutex
);
3472 ceph_put_mds_session(s
);
3474 mutex_lock(&mdsc
->mutex
);
3476 mutex_unlock(&mdsc
->mutex
);
3478 schedule_delayed(mdsc
);
3481 int ceph_mdsc_init(struct ceph_fs_client
*fsc
)
3484 struct ceph_mds_client
*mdsc
;
3486 mdsc
= kzalloc(sizeof(struct ceph_mds_client
), GFP_NOFS
);
3491 mutex_init(&mdsc
->mutex
);
3492 mdsc
->mdsmap
= kzalloc(sizeof(*mdsc
->mdsmap
), GFP_NOFS
);
3493 if (mdsc
->mdsmap
== NULL
) {
3498 init_completion(&mdsc
->safe_umount_waiters
);
3499 init_waitqueue_head(&mdsc
->session_close_wq
);
3500 INIT_LIST_HEAD(&mdsc
->waiting_for_map
);
3501 mdsc
->sessions
= NULL
;
3502 atomic_set(&mdsc
->num_sessions
, 0);
3503 mdsc
->max_sessions
= 0;
3505 mdsc
->last_snap_seq
= 0;
3506 init_rwsem(&mdsc
->snap_rwsem
);
3507 mdsc
->snap_realms
= RB_ROOT
;
3508 INIT_LIST_HEAD(&mdsc
->snap_empty
);
3509 spin_lock_init(&mdsc
->snap_empty_lock
);
3511 mdsc
->oldest_tid
= 0;
3512 mdsc
->request_tree
= RB_ROOT
;
3513 INIT_DELAYED_WORK(&mdsc
->delayed_work
, delayed_work
);
3514 mdsc
->last_renew_caps
= jiffies
;
3515 INIT_LIST_HEAD(&mdsc
->cap_delay_list
);
3516 spin_lock_init(&mdsc
->cap_delay_lock
);
3517 INIT_LIST_HEAD(&mdsc
->snap_flush_list
);
3518 spin_lock_init(&mdsc
->snap_flush_lock
);
3519 mdsc
->last_cap_flush_tid
= 1;
3520 INIT_LIST_HEAD(&mdsc
->cap_flush_list
);
3521 INIT_LIST_HEAD(&mdsc
->cap_dirty
);
3522 INIT_LIST_HEAD(&mdsc
->cap_dirty_migrating
);
3523 mdsc
->num_cap_flushing
= 0;
3524 spin_lock_init(&mdsc
->cap_dirty_lock
);
3525 init_waitqueue_head(&mdsc
->cap_flushing_wq
);
3526 spin_lock_init(&mdsc
->dentry_lru_lock
);
3527 INIT_LIST_HEAD(&mdsc
->dentry_lru
);
3529 ceph_caps_init(mdsc
);
3530 ceph_adjust_min_caps(mdsc
, fsc
->min_caps
);
3532 init_rwsem(&mdsc
->pool_perm_rwsem
);
3533 mdsc
->pool_perm_tree
= RB_ROOT
;
3539 * Wait for safe replies on open mds requests. If we time out, drop
3540 * all requests from the tree to avoid dangling dentry refs.
3542 static void wait_requests(struct ceph_mds_client
*mdsc
)
3544 struct ceph_options
*opts
= mdsc
->fsc
->client
->options
;
3545 struct ceph_mds_request
*req
;
3547 mutex_lock(&mdsc
->mutex
);
3548 if (__get_oldest_req(mdsc
)) {
3549 mutex_unlock(&mdsc
->mutex
);
3551 dout("wait_requests waiting for requests\n");
3552 wait_for_completion_timeout(&mdsc
->safe_umount_waiters
,
3553 ceph_timeout_jiffies(opts
->mount_timeout
));
3555 /* tear down remaining requests */
3556 mutex_lock(&mdsc
->mutex
);
3557 while ((req
= __get_oldest_req(mdsc
))) {
3558 dout("wait_requests timed out on tid %llu\n",
3560 __unregister_request(mdsc
, req
);
3563 mutex_unlock(&mdsc
->mutex
);
3564 dout("wait_requests done\n");
3568 * called before mount is ro, and before dentries are torn down.
3569 * (hmm, does this still race with new lookups?)
3571 void ceph_mdsc_pre_umount(struct ceph_mds_client
*mdsc
)
3573 dout("pre_umount\n");
3577 ceph_flush_dirty_caps(mdsc
);
3578 wait_requests(mdsc
);
3581 * wait for reply handlers to drop their request refs and
3582 * their inode/dcache refs
3588 * wait for all write mds requests to flush.
3590 static void wait_unsafe_requests(struct ceph_mds_client
*mdsc
, u64 want_tid
)
3592 struct ceph_mds_request
*req
= NULL
, *nextreq
;
3595 mutex_lock(&mdsc
->mutex
);
3596 dout("wait_unsafe_requests want %lld\n", want_tid
);
3598 req
= __get_oldest_req(mdsc
);
3599 while (req
&& req
->r_tid
<= want_tid
) {
3600 /* find next request */
3601 n
= rb_next(&req
->r_node
);
3603 nextreq
= rb_entry(n
, struct ceph_mds_request
, r_node
);
3606 if (req
->r_op
!= CEPH_MDS_OP_SETFILELOCK
&&
3607 (req
->r_op
& CEPH_MDS_OP_WRITE
)) {
3609 ceph_mdsc_get_request(req
);
3611 ceph_mdsc_get_request(nextreq
);
3612 mutex_unlock(&mdsc
->mutex
);
3613 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3614 req
->r_tid
, want_tid
);
3615 wait_for_completion(&req
->r_safe_completion
);
3616 mutex_lock(&mdsc
->mutex
);
3617 ceph_mdsc_put_request(req
);
3619 break; /* next dne before, so we're done! */
3620 if (RB_EMPTY_NODE(&nextreq
->r_node
)) {
3621 /* next request was removed from tree */
3622 ceph_mdsc_put_request(nextreq
);
3625 ceph_mdsc_put_request(nextreq
); /* won't go away */
3629 mutex_unlock(&mdsc
->mutex
);
3630 dout("wait_unsafe_requests done\n");
3633 void ceph_mdsc_sync(struct ceph_mds_client
*mdsc
)
3635 u64 want_tid
, want_flush
;
3637 if (READ_ONCE(mdsc
->fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
)
3641 mutex_lock(&mdsc
->mutex
);
3642 want_tid
= mdsc
->last_tid
;
3643 mutex_unlock(&mdsc
->mutex
);
3645 ceph_flush_dirty_caps(mdsc
);
3646 spin_lock(&mdsc
->cap_dirty_lock
);
3647 want_flush
= mdsc
->last_cap_flush_tid
;
3648 if (!list_empty(&mdsc
->cap_flush_list
)) {
3649 struct ceph_cap_flush
*cf
=
3650 list_last_entry(&mdsc
->cap_flush_list
,
3651 struct ceph_cap_flush
, g_list
);
3654 spin_unlock(&mdsc
->cap_dirty_lock
);
3656 dout("sync want tid %lld flush_seq %lld\n",
3657 want_tid
, want_flush
);
3659 wait_unsafe_requests(mdsc
, want_tid
);
3660 wait_caps_flush(mdsc
, want_flush
);
3664 * true if all sessions are closed, or we force unmount
3666 static bool done_closing_sessions(struct ceph_mds_client
*mdsc
, int skipped
)
3668 if (READ_ONCE(mdsc
->fsc
->mount_state
) == CEPH_MOUNT_SHUTDOWN
)
3670 return atomic_read(&mdsc
->num_sessions
) <= skipped
;
3674 * called after sb is ro.
3676 void ceph_mdsc_close_sessions(struct ceph_mds_client
*mdsc
)
3678 struct ceph_options
*opts
= mdsc
->fsc
->client
->options
;
3679 struct ceph_mds_session
*session
;
3683 dout("close_sessions\n");
3685 /* close sessions */
3686 mutex_lock(&mdsc
->mutex
);
3687 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3688 session
= __ceph_lookup_mds_session(mdsc
, i
);
3691 mutex_unlock(&mdsc
->mutex
);
3692 mutex_lock(&session
->s_mutex
);
3693 if (__close_session(mdsc
, session
) <= 0)
3695 mutex_unlock(&session
->s_mutex
);
3696 ceph_put_mds_session(session
);
3697 mutex_lock(&mdsc
->mutex
);
3699 mutex_unlock(&mdsc
->mutex
);
3701 dout("waiting for sessions to close\n");
3702 wait_event_timeout(mdsc
->session_close_wq
,
3703 done_closing_sessions(mdsc
, skipped
),
3704 ceph_timeout_jiffies(opts
->mount_timeout
));
3706 /* tear down remaining sessions */
3707 mutex_lock(&mdsc
->mutex
);
3708 for (i
= 0; i
< mdsc
->max_sessions
; i
++) {
3709 if (mdsc
->sessions
[i
]) {
3710 session
= get_session(mdsc
->sessions
[i
]);
3711 __unregister_session(mdsc
, session
);
3712 mutex_unlock(&mdsc
->mutex
);
3713 mutex_lock(&session
->s_mutex
);
3714 remove_session_caps(session
);
3715 mutex_unlock(&session
->s_mutex
);
3716 ceph_put_mds_session(session
);
3717 mutex_lock(&mdsc
->mutex
);
3720 WARN_ON(!list_empty(&mdsc
->cap_delay_list
));
3721 mutex_unlock(&mdsc
->mutex
);
3723 ceph_cleanup_empty_realms(mdsc
);
3725 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3730 void ceph_mdsc_force_umount(struct ceph_mds_client
*mdsc
)
3732 struct ceph_mds_session
*session
;
3735 dout("force umount\n");
3737 mutex_lock(&mdsc
->mutex
);
3738 for (mds
= 0; mds
< mdsc
->max_sessions
; mds
++) {
3739 session
= __ceph_lookup_mds_session(mdsc
, mds
);
3742 mutex_unlock(&mdsc
->mutex
);
3743 mutex_lock(&session
->s_mutex
);
3744 __close_session(mdsc
, session
);
3745 if (session
->s_state
== CEPH_MDS_SESSION_CLOSING
) {
3746 cleanup_session_requests(mdsc
, session
);
3747 remove_session_caps(session
);
3749 mutex_unlock(&session
->s_mutex
);
3750 ceph_put_mds_session(session
);
3751 mutex_lock(&mdsc
->mutex
);
3752 kick_requests(mdsc
, mds
);
3754 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3755 mutex_unlock(&mdsc
->mutex
);
3758 static void ceph_mdsc_stop(struct ceph_mds_client
*mdsc
)
3761 cancel_delayed_work_sync(&mdsc
->delayed_work
); /* cancel timer */
3763 ceph_mdsmap_destroy(mdsc
->mdsmap
);
3764 kfree(mdsc
->sessions
);
3765 ceph_caps_finalize(mdsc
);
3766 ceph_pool_perm_destroy(mdsc
);
3769 void ceph_mdsc_destroy(struct ceph_fs_client
*fsc
)
3771 struct ceph_mds_client
*mdsc
= fsc
->mdsc
;
3772 dout("mdsc_destroy %p\n", mdsc
);
3774 /* flush out any connection work with references to us */
3777 ceph_mdsc_stop(mdsc
);
3781 dout("mdsc_destroy %p done\n", mdsc
);
3784 void ceph_mdsc_handle_fsmap(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3786 struct ceph_fs_client
*fsc
= mdsc
->fsc
;
3787 const char *mds_namespace
= fsc
->mount_options
->mds_namespace
;
3788 void *p
= msg
->front
.iov_base
;
3789 void *end
= p
+ msg
->front
.iov_len
;
3793 u32 mount_fscid
= (u32
)-1;
3794 u8 struct_v
, struct_cv
;
3797 ceph_decode_need(&p
, end
, sizeof(u32
), bad
);
3798 epoch
= ceph_decode_32(&p
);
3800 dout("handle_fsmap epoch %u\n", epoch
);
3802 ceph_decode_need(&p
, end
, 2 + sizeof(u32
), bad
);
3803 struct_v
= ceph_decode_8(&p
);
3804 struct_cv
= ceph_decode_8(&p
);
3805 map_len
= ceph_decode_32(&p
);
3807 ceph_decode_need(&p
, end
, sizeof(u32
) * 3, bad
);
3808 p
+= sizeof(u32
) * 2; /* skip epoch and legacy_client_fscid */
3810 num_fs
= ceph_decode_32(&p
);
3811 while (num_fs
-- > 0) {
3812 void *info_p
, *info_end
;
3817 ceph_decode_need(&p
, end
, 2 + sizeof(u32
), bad
);
3818 info_v
= ceph_decode_8(&p
);
3819 info_cv
= ceph_decode_8(&p
);
3820 info_len
= ceph_decode_32(&p
);
3821 ceph_decode_need(&p
, end
, info_len
, bad
);
3823 info_end
= p
+ info_len
;
3826 ceph_decode_need(&info_p
, info_end
, sizeof(u32
) * 2, bad
);
3827 fscid
= ceph_decode_32(&info_p
);
3828 namelen
= ceph_decode_32(&info_p
);
3829 ceph_decode_need(&info_p
, info_end
, namelen
, bad
);
3831 if (mds_namespace
&&
3832 strlen(mds_namespace
) == namelen
&&
3833 !strncmp(mds_namespace
, (char *)info_p
, namelen
)) {
3834 mount_fscid
= fscid
;
3839 ceph_monc_got_map(&fsc
->client
->monc
, CEPH_SUB_FSMAP
, epoch
);
3840 if (mount_fscid
!= (u32
)-1) {
3841 fsc
->client
->monc
.fs_cluster_id
= mount_fscid
;
3842 ceph_monc_want_map(&fsc
->client
->monc
, CEPH_SUB_MDSMAP
,
3844 ceph_monc_renew_subs(&fsc
->client
->monc
);
3851 pr_err("error decoding fsmap\n");
3853 mutex_lock(&mdsc
->mutex
);
3854 mdsc
->mdsmap_err
= -ENOENT
;
3855 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3856 mutex_unlock(&mdsc
->mutex
);
3861 * handle mds map update.
3863 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client
*mdsc
, struct ceph_msg
*msg
)
3867 void *p
= msg
->front
.iov_base
;
3868 void *end
= p
+ msg
->front
.iov_len
;
3869 struct ceph_mdsmap
*newmap
, *oldmap
;
3870 struct ceph_fsid fsid
;
3873 ceph_decode_need(&p
, end
, sizeof(fsid
)+2*sizeof(u32
), bad
);
3874 ceph_decode_copy(&p
, &fsid
, sizeof(fsid
));
3875 if (ceph_check_fsid(mdsc
->fsc
->client
, &fsid
) < 0)
3877 epoch
= ceph_decode_32(&p
);
3878 maplen
= ceph_decode_32(&p
);
3879 dout("handle_map epoch %u len %d\n", epoch
, (int)maplen
);
3881 /* do we need it? */
3882 mutex_lock(&mdsc
->mutex
);
3883 if (mdsc
->mdsmap
&& epoch
<= mdsc
->mdsmap
->m_epoch
) {
3884 dout("handle_map epoch %u <= our %u\n",
3885 epoch
, mdsc
->mdsmap
->m_epoch
);
3886 mutex_unlock(&mdsc
->mutex
);
3890 newmap
= ceph_mdsmap_decode(&p
, end
);
3891 if (IS_ERR(newmap
)) {
3892 err
= PTR_ERR(newmap
);
3896 /* swap into place */
3898 oldmap
= mdsc
->mdsmap
;
3899 mdsc
->mdsmap
= newmap
;
3900 check_new_map(mdsc
, newmap
, oldmap
);
3901 ceph_mdsmap_destroy(oldmap
);
3903 mdsc
->mdsmap
= newmap
; /* first mds map */
3905 mdsc
->fsc
->sb
->s_maxbytes
= mdsc
->mdsmap
->m_max_file_size
;
3907 __wake_requests(mdsc
, &mdsc
->waiting_for_map
);
3908 ceph_monc_got_map(&mdsc
->fsc
->client
->monc
, CEPH_SUB_MDSMAP
,
3909 mdsc
->mdsmap
->m_epoch
);
3911 mutex_unlock(&mdsc
->mutex
);
3912 schedule_delayed(mdsc
);
3916 mutex_unlock(&mdsc
->mutex
);
3918 pr_err("error decoding mdsmap %d\n", err
);
3922 static struct ceph_connection
*con_get(struct ceph_connection
*con
)
3924 struct ceph_mds_session
*s
= con
->private;
3926 if (get_session(s
)) {
3927 dout("mdsc con_get %p ok (%d)\n", s
, refcount_read(&s
->s_ref
));
3930 dout("mdsc con_get %p FAIL\n", s
);
3934 static void con_put(struct ceph_connection
*con
)
3936 struct ceph_mds_session
*s
= con
->private;
3938 dout("mdsc con_put %p (%d)\n", s
, refcount_read(&s
->s_ref
) - 1);
3939 ceph_put_mds_session(s
);
3943 * if the client is unresponsive for long enough, the mds will kill
3944 * the session entirely.
3946 static void peer_reset(struct ceph_connection
*con
)
3948 struct ceph_mds_session
*s
= con
->private;
3949 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3951 pr_warn("mds%d closed our session\n", s
->s_mds
);
3952 send_mds_reconnect(mdsc
, s
);
3955 static void dispatch(struct ceph_connection
*con
, struct ceph_msg
*msg
)
3957 struct ceph_mds_session
*s
= con
->private;
3958 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
3959 int type
= le16_to_cpu(msg
->hdr
.type
);
3961 mutex_lock(&mdsc
->mutex
);
3962 if (__verify_registered_session(mdsc
, s
) < 0) {
3963 mutex_unlock(&mdsc
->mutex
);
3966 mutex_unlock(&mdsc
->mutex
);
3969 case CEPH_MSG_MDS_MAP
:
3970 ceph_mdsc_handle_mdsmap(mdsc
, msg
);
3972 case CEPH_MSG_FS_MAP_USER
:
3973 ceph_mdsc_handle_fsmap(mdsc
, msg
);
3975 case CEPH_MSG_CLIENT_SESSION
:
3976 handle_session(s
, msg
);
3978 case CEPH_MSG_CLIENT_REPLY
:
3979 handle_reply(s
, msg
);
3981 case CEPH_MSG_CLIENT_REQUEST_FORWARD
:
3982 handle_forward(mdsc
, s
, msg
);
3984 case CEPH_MSG_CLIENT_CAPS
:
3985 ceph_handle_caps(s
, msg
);
3987 case CEPH_MSG_CLIENT_SNAP
:
3988 ceph_handle_snap(mdsc
, s
, msg
);
3990 case CEPH_MSG_CLIENT_LEASE
:
3991 handle_lease(mdsc
, s
, msg
);
3995 pr_err("received unknown message type %d %s\n", type
,
3996 ceph_msg_type_name(type
));
4007 * Note: returned pointer is the address of a structure that's
4008 * managed separately. Caller must *not* attempt to free it.
4010 static struct ceph_auth_handshake
*get_authorizer(struct ceph_connection
*con
,
4011 int *proto
, int force_new
)
4013 struct ceph_mds_session
*s
= con
->private;
4014 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
4015 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
4016 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
4018 if (force_new
&& auth
->authorizer
) {
4019 ceph_auth_destroy_authorizer(auth
->authorizer
);
4020 auth
->authorizer
= NULL
;
4022 if (!auth
->authorizer
) {
4023 int ret
= ceph_auth_create_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
4026 return ERR_PTR(ret
);
4028 int ret
= ceph_auth_update_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
,
4031 return ERR_PTR(ret
);
4033 *proto
= ac
->protocol
;
4039 static int verify_authorizer_reply(struct ceph_connection
*con
)
4041 struct ceph_mds_session
*s
= con
->private;
4042 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
4043 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
4045 return ceph_auth_verify_authorizer_reply(ac
, s
->s_auth
.authorizer
);
4048 static int invalidate_authorizer(struct ceph_connection
*con
)
4050 struct ceph_mds_session
*s
= con
->private;
4051 struct ceph_mds_client
*mdsc
= s
->s_mdsc
;
4052 struct ceph_auth_client
*ac
= mdsc
->fsc
->client
->monc
.auth
;
4054 ceph_auth_invalidate_authorizer(ac
, CEPH_ENTITY_TYPE_MDS
);
4056 return ceph_monc_validate_auth(&mdsc
->fsc
->client
->monc
);
4059 static struct ceph_msg
*mds_alloc_msg(struct ceph_connection
*con
,
4060 struct ceph_msg_header
*hdr
, int *skip
)
4062 struct ceph_msg
*msg
;
4063 int type
= (int) le16_to_cpu(hdr
->type
);
4064 int front_len
= (int) le32_to_cpu(hdr
->front_len
);
4070 msg
= ceph_msg_new(type
, front_len
, GFP_NOFS
, false);
4072 pr_err("unable to allocate msg type %d len %d\n",
4080 static int mds_sign_message(struct ceph_msg
*msg
)
4082 struct ceph_mds_session
*s
= msg
->con
->private;
4083 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
4085 return ceph_auth_sign_message(auth
, msg
);
4088 static int mds_check_message_signature(struct ceph_msg
*msg
)
4090 struct ceph_mds_session
*s
= msg
->con
->private;
4091 struct ceph_auth_handshake
*auth
= &s
->s_auth
;
4093 return ceph_auth_check_message_signature(auth
, msg
);
4096 static const struct ceph_connection_operations mds_con_ops
= {
4099 .dispatch
= dispatch
,
4100 .get_authorizer
= get_authorizer
,
4101 .verify_authorizer_reply
= verify_authorizer_reply
,
4102 .invalidate_authorizer
= invalidate_authorizer
,
4103 .peer_reset
= peer_reset
,
4104 .alloc_msg
= mds_alloc_msg
,
4105 .sign_message
= mds_sign_message
,
4106 .check_message_signature
= mds_check_message_signature
,