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45 * are no longer valid.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);
196 BUG_ON(!info->dir_entries);
197 if ((unsigned long)(info->dir_entries + num) >
198 (unsigned long)info->dir_entries + info->dir_buf_size) {
199 pr_err("dir contents are larger than expected\n");
206 struct ceph_mds_reply_dir_entry *rde = info->dir_entries + i;
208 ceph_decode_need(p, end, sizeof(u32)*2, bad);
209 rde->name_len = ceph_decode_32(p);
210 ceph_decode_need(p, end, rde->name_len, bad);
213 dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name);
215 *p += sizeof(struct ceph_mds_reply_lease);
218 err = parse_reply_info_in(p, end, &rde->inode, features);
221 /* ceph_readdir_prepopulate() will update it */
235 pr_err("problem parsing dir contents %d\n", err);
240 * parse fcntl F_GETLK results
242 static int parse_reply_info_filelock(void **p, void *end,
243 struct ceph_mds_reply_info_parsed *info,
246 if (*p + sizeof(*info->filelock_reply) > end)
249 info->filelock_reply = *p;
250 *p += sizeof(*info->filelock_reply);
252 if (unlikely(*p != end))
261 * parse create results
263 static int parse_reply_info_create(void **p, void *end,
264 struct ceph_mds_reply_info_parsed *info,
267 if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
269 info->has_create_ino = false;
271 info->has_create_ino = true;
272 info->ino = ceph_decode_64(p);
276 if (unlikely(*p != end))
285 * parse extra results
287 static int parse_reply_info_extra(void **p, void *end,
288 struct ceph_mds_reply_info_parsed *info,
291 u32 op = le32_to_cpu(info->head->op);
293 if (op == CEPH_MDS_OP_GETFILELOCK)
294 return parse_reply_info_filelock(p, end, info, features);
295 else if (op == CEPH_MDS_OP_READDIR || op == CEPH_MDS_OP_LSSNAP)
296 return parse_reply_info_dir(p, end, info, features);
297 else if (op == CEPH_MDS_OP_CREATE)
298 return parse_reply_info_create(p, end, info, features);
304 * parse entire mds reply
306 static int parse_reply_info(struct ceph_msg *msg,
307 struct ceph_mds_reply_info_parsed *info,
314 info->head = msg->front.iov_base;
315 p = msg->front.iov_base + sizeof(struct ceph_mds_reply_head);
316 end = p + msg->front.iov_len - sizeof(struct ceph_mds_reply_head);
319 ceph_decode_32_safe(&p, end, len, bad);
321 ceph_decode_need(&p, end, len, bad);
322 err = parse_reply_info_trace(&p, p+len, info, features);
328 ceph_decode_32_safe(&p, end, len, bad);
330 ceph_decode_need(&p, end, len, bad);
331 err = parse_reply_info_extra(&p, p+len, info, features);
337 ceph_decode_32_safe(&p, end, len, bad);
338 info->snapblob_len = len;
349 pr_err("mds parse_reply err %d\n", err);
353 static void destroy_reply_info(struct ceph_mds_reply_info_parsed *info)
355 if (!info->dir_entries)
357 free_pages((unsigned long)info->dir_entries, get_order(info->dir_buf_size));
364 const char *ceph_session_state_name(int s)
367 case CEPH_MDS_SESSION_NEW: return "new";
368 case CEPH_MDS_SESSION_OPENING: return "opening";
369 case CEPH_MDS_SESSION_OPEN: return "open";
370 case CEPH_MDS_SESSION_HUNG: return "hung";
371 case CEPH_MDS_SESSION_CLOSING: return "closing";
372 case CEPH_MDS_SESSION_RESTARTING: return "restarting";
373 case CEPH_MDS_SESSION_RECONNECTING: return "reconnecting";
374 case CEPH_MDS_SESSION_REJECTED: return "rejected";
375 default: return "???";
379 static struct ceph_mds_session *get_session(struct ceph_mds_session *s)
381 if (atomic_inc_not_zero(&s->s_ref)) {
382 dout("mdsc get_session %p %d -> %d\n", s,
383 atomic_read(&s->s_ref)-1, atomic_read(&s->s_ref));
386 dout("mdsc get_session %p 0 -- FAIL", s);
391 void ceph_put_mds_session(struct ceph_mds_session *s)
393 dout("mdsc put_session %p %d -> %d\n", s,
394 atomic_read(&s->s_ref), atomic_read(&s->s_ref)-1);
395 if (atomic_dec_and_test(&s->s_ref)) {
396 if (s->s_auth.authorizer)
397 ceph_auth_destroy_authorizer(s->s_auth.authorizer);
403 * called under mdsc->mutex
405 struct ceph_mds_session *__ceph_lookup_mds_session(struct ceph_mds_client *mdsc,
408 struct ceph_mds_session *session;
410 if (mds >= mdsc->max_sessions || mdsc->sessions[mds] == NULL)
412 session = mdsc->sessions[mds];
413 dout("lookup_mds_session %p %d\n", session,
414 atomic_read(&session->s_ref));
415 get_session(session);
419 static bool __have_session(struct ceph_mds_client *mdsc, int mds)
421 if (mds >= mdsc->max_sessions)
423 return mdsc->sessions[mds];
426 static int __verify_registered_session(struct ceph_mds_client *mdsc,
427 struct ceph_mds_session *s)
429 if (s->s_mds >= mdsc->max_sessions ||
430 mdsc->sessions[s->s_mds] != s)
436 * create+register a new session for given mds.
437 * called under mdsc->mutex.
439 static struct ceph_mds_session *register_session(struct ceph_mds_client *mdsc,
442 struct ceph_mds_session *s;
444 if (mds >= mdsc->mdsmap->m_max_mds)
445 return ERR_PTR(-EINVAL);
447 s = kzalloc(sizeof(*s), GFP_NOFS);
449 return ERR_PTR(-ENOMEM);
452 s->s_state = CEPH_MDS_SESSION_NEW;
455 mutex_init(&s->s_mutex);
457 ceph_con_init(&s->s_con, s, &mds_con_ops, &mdsc->fsc->client->msgr);
459 spin_lock_init(&s->s_gen_ttl_lock);
461 s->s_cap_ttl = jiffies - 1;
463 spin_lock_init(&s->s_cap_lock);
464 s->s_renew_requested = 0;
466 INIT_LIST_HEAD(&s->s_caps);
469 atomic_set(&s->s_ref, 1);
470 INIT_LIST_HEAD(&s->s_waiting);
471 INIT_LIST_HEAD(&s->s_unsafe);
472 s->s_num_cap_releases = 0;
473 s->s_cap_reconnect = 0;
474 s->s_cap_iterator = NULL;
475 INIT_LIST_HEAD(&s->s_cap_releases);
476 INIT_LIST_HEAD(&s->s_cap_flushing);
478 dout("register_session mds%d\n", mds);
479 if (mds >= mdsc->max_sessions) {
480 int newmax = 1 << get_count_order(mds+1);
481 struct ceph_mds_session **sa;
483 dout("register_session realloc to %d\n", newmax);
484 sa = kcalloc(newmax, sizeof(void *), GFP_NOFS);
487 if (mdsc->sessions) {
488 memcpy(sa, mdsc->sessions,
489 mdsc->max_sessions * sizeof(void *));
490 kfree(mdsc->sessions);
493 mdsc->max_sessions = newmax;
495 mdsc->sessions[mds] = s;
496 atomic_inc(&mdsc->num_sessions);
497 atomic_inc(&s->s_ref); /* one ref to sessions[], one to caller */
499 ceph_con_open(&s->s_con, CEPH_ENTITY_TYPE_MDS, mds,
500 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
506 return ERR_PTR(-ENOMEM);
510 * called under mdsc->mutex
512 static void __unregister_session(struct ceph_mds_client *mdsc,
513 struct ceph_mds_session *s)
515 dout("__unregister_session mds%d %p\n", s->s_mds, s);
516 BUG_ON(mdsc->sessions[s->s_mds] != s);
517 mdsc->sessions[s->s_mds] = NULL;
518 ceph_con_close(&s->s_con);
519 ceph_put_mds_session(s);
520 atomic_dec(&mdsc->num_sessions);
524 * drop session refs in request.
526 * should be last request ref, or hold mdsc->mutex
528 static void put_request_session(struct ceph_mds_request *req)
530 if (req->r_session) {
531 ceph_put_mds_session(req->r_session);
532 req->r_session = NULL;
536 void ceph_mdsc_release_request(struct kref *kref)
538 struct ceph_mds_request *req = container_of(kref,
539 struct ceph_mds_request,
541 destroy_reply_info(&req->r_reply_info);
543 ceph_msg_put(req->r_request);
545 ceph_msg_put(req->r_reply);
547 ceph_put_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
550 if (req->r_locked_dir)
551 ceph_put_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
552 iput(req->r_target_inode);
555 if (req->r_old_dentry)
556 dput(req->r_old_dentry);
557 if (req->r_old_dentry_dir) {
559 * track (and drop pins for) r_old_dentry_dir
560 * separately, since r_old_dentry's d_parent may have
561 * changed between the dir mutex being dropped and
562 * this request being freed.
564 ceph_put_cap_refs(ceph_inode(req->r_old_dentry_dir),
566 iput(req->r_old_dentry_dir);
571 ceph_pagelist_release(req->r_pagelist);
572 put_request_session(req);
573 ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation);
577 DEFINE_RB_FUNCS(request, struct ceph_mds_request, r_tid, r_node)
580 * lookup session, bump ref if found.
582 * called under mdsc->mutex.
584 static struct ceph_mds_request *
585 lookup_get_request(struct ceph_mds_client *mdsc, u64 tid)
587 struct ceph_mds_request *req;
589 req = lookup_request(&mdsc->request_tree, tid);
591 ceph_mdsc_get_request(req);
597 * Register an in-flight request, and assign a tid. Link to directory
598 * are modifying (if any).
600 * Called under mdsc->mutex.
602 static void __register_request(struct ceph_mds_client *mdsc,
603 struct ceph_mds_request *req,
606 req->r_tid = ++mdsc->last_tid;
608 ceph_reserve_caps(mdsc, &req->r_caps_reservation,
610 dout("__register_request %p tid %lld\n", req, req->r_tid);
611 ceph_mdsc_get_request(req);
612 insert_request(&mdsc->request_tree, req);
614 req->r_uid = current_fsuid();
615 req->r_gid = current_fsgid();
617 if (mdsc->oldest_tid == 0 && req->r_op != CEPH_MDS_OP_SETFILELOCK)
618 mdsc->oldest_tid = req->r_tid;
622 req->r_unsafe_dir = dir;
626 static void __unregister_request(struct ceph_mds_client *mdsc,
627 struct ceph_mds_request *req)
629 dout("__unregister_request %p tid %lld\n", req, req->r_tid);
631 /* Never leave an unregistered request on an unsafe list! */
632 list_del_init(&req->r_unsafe_item);
634 if (req->r_tid == mdsc->oldest_tid) {
635 struct rb_node *p = rb_next(&req->r_node);
636 mdsc->oldest_tid = 0;
638 struct ceph_mds_request *next_req =
639 rb_entry(p, struct ceph_mds_request, r_node);
640 if (next_req->r_op != CEPH_MDS_OP_SETFILELOCK) {
641 mdsc->oldest_tid = next_req->r_tid;
648 erase_request(&mdsc->request_tree, req);
650 if (req->r_unsafe_dir && req->r_got_unsafe) {
651 struct ceph_inode_info *ci = ceph_inode(req->r_unsafe_dir);
652 spin_lock(&ci->i_unsafe_lock);
653 list_del_init(&req->r_unsafe_dir_item);
654 spin_unlock(&ci->i_unsafe_lock);
656 if (req->r_target_inode && req->r_got_unsafe) {
657 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
658 spin_lock(&ci->i_unsafe_lock);
659 list_del_init(&req->r_unsafe_target_item);
660 spin_unlock(&ci->i_unsafe_lock);
663 if (req->r_unsafe_dir) {
664 iput(req->r_unsafe_dir);
665 req->r_unsafe_dir = NULL;
668 complete_all(&req->r_safe_completion);
670 ceph_mdsc_put_request(req);
674 * Choose mds to send request to next. If there is a hint set in the
675 * request (e.g., due to a prior forward hint from the mds), use that.
676 * Otherwise, consult frag tree and/or caps to identify the
677 * appropriate mds. If all else fails, choose randomly.
679 * Called under mdsc->mutex.
681 static struct dentry *get_nonsnap_parent(struct dentry *dentry)
684 * we don't need to worry about protecting the d_parent access
685 * here because we never renaming inside the snapped namespace
686 * except to resplice to another snapdir, and either the old or new
687 * result is a valid result.
689 while (!IS_ROOT(dentry) && ceph_snap(d_inode(dentry)) != CEPH_NOSNAP)
690 dentry = dentry->d_parent;
694 static int __choose_mds(struct ceph_mds_client *mdsc,
695 struct ceph_mds_request *req)
698 struct ceph_inode_info *ci;
699 struct ceph_cap *cap;
700 int mode = req->r_direct_mode;
702 u32 hash = req->r_direct_hash;
703 bool is_hash = req->r_direct_is_hash;
706 * is there a specific mds we should try? ignore hint if we have
707 * no session and the mds is not up (active or recovering).
709 if (req->r_resend_mds >= 0 &&
710 (__have_session(mdsc, req->r_resend_mds) ||
711 ceph_mdsmap_get_state(mdsc->mdsmap, req->r_resend_mds) > 0)) {
712 dout("choose_mds using resend_mds mds%d\n",
714 return req->r_resend_mds;
717 if (mode == USE_RANDOM_MDS)
722 inode = req->r_inode;
723 } else if (req->r_dentry) {
724 /* ignore race with rename; old or new d_parent is okay */
725 struct dentry *parent = req->r_dentry->d_parent;
726 struct inode *dir = d_inode(parent);
728 if (dir->i_sb != mdsc->fsc->sb) {
730 inode = d_inode(req->r_dentry);
731 } else if (ceph_snap(dir) != CEPH_NOSNAP) {
732 /* direct snapped/virtual snapdir requests
733 * based on parent dir inode */
734 struct dentry *dn = get_nonsnap_parent(parent);
736 dout("__choose_mds using nonsnap parent %p\n", inode);
739 inode = d_inode(req->r_dentry);
740 if (!inode || mode == USE_AUTH_MDS) {
743 hash = ceph_dentry_hash(dir, req->r_dentry);
749 dout("__choose_mds %p is_hash=%d (%d) mode %d\n", inode, (int)is_hash,
753 ci = ceph_inode(inode);
755 if (is_hash && S_ISDIR(inode->i_mode)) {
756 struct ceph_inode_frag frag;
759 ceph_choose_frag(ci, hash, &frag, &found);
761 if (mode == USE_ANY_MDS && frag.ndist > 0) {
764 /* choose a random replica */
765 get_random_bytes(&r, 1);
768 dout("choose_mds %p %llx.%llx "
769 "frag %u mds%d (%d/%d)\n",
770 inode, ceph_vinop(inode),
773 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
774 CEPH_MDS_STATE_ACTIVE)
778 /* since this file/dir wasn't known to be
779 * replicated, then we want to look for the
780 * authoritative mds. */
783 /* choose auth mds */
785 dout("choose_mds %p %llx.%llx "
786 "frag %u mds%d (auth)\n",
787 inode, ceph_vinop(inode), frag.frag, mds);
788 if (ceph_mdsmap_get_state(mdsc->mdsmap, mds) >=
789 CEPH_MDS_STATE_ACTIVE)
795 spin_lock(&ci->i_ceph_lock);
797 if (mode == USE_AUTH_MDS)
798 cap = ci->i_auth_cap;
799 if (!cap && !RB_EMPTY_ROOT(&ci->i_caps))
800 cap = rb_entry(rb_first(&ci->i_caps), struct ceph_cap, ci_node);
802 spin_unlock(&ci->i_ceph_lock);
805 mds = cap->session->s_mds;
806 dout("choose_mds %p %llx.%llx mds%d (%scap %p)\n",
807 inode, ceph_vinop(inode), mds,
808 cap == ci->i_auth_cap ? "auth " : "", cap);
809 spin_unlock(&ci->i_ceph_lock);
813 mds = ceph_mdsmap_get_random_mds(mdsc->mdsmap);
814 dout("choose_mds chose random mds%d\n", mds);
822 static struct ceph_msg *create_session_msg(u32 op, u64 seq)
824 struct ceph_msg *msg;
825 struct ceph_mds_session_head *h;
827 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h), GFP_NOFS,
830 pr_err("create_session_msg ENOMEM creating msg\n");
833 h = msg->front.iov_base;
834 h->op = cpu_to_le32(op);
835 h->seq = cpu_to_le64(seq);
841 * session message, specialization for CEPH_SESSION_REQUEST_OPEN
842 * to include additional client metadata fields.
844 static struct ceph_msg *create_session_open_msg(struct ceph_mds_client *mdsc, u64 seq)
846 struct ceph_msg *msg;
847 struct ceph_mds_session_head *h;
849 int metadata_bytes = 0;
850 int metadata_key_count = 0;
851 struct ceph_options *opt = mdsc->fsc->client->options;
852 struct ceph_mount_options *fsopt = mdsc->fsc->mount_options;
855 const char* metadata[][2] = {
856 {"hostname", utsname()->nodename},
857 {"kernel_version", utsname()->release},
858 {"entity_id", opt->name ? : ""},
859 {"root", fsopt->server_path ? : "/"},
863 /* Calculate serialized length of metadata */
864 metadata_bytes = 4; /* map length */
865 for (i = 0; metadata[i][0] != NULL; ++i) {
866 metadata_bytes += 8 + strlen(metadata[i][0]) +
867 strlen(metadata[i][1]);
868 metadata_key_count++;
871 /* Allocate the message */
872 msg = ceph_msg_new(CEPH_MSG_CLIENT_SESSION, sizeof(*h) + metadata_bytes,
875 pr_err("create_session_msg ENOMEM creating msg\n");
878 h = msg->front.iov_base;
879 h->op = cpu_to_le32(CEPH_SESSION_REQUEST_OPEN);
880 h->seq = cpu_to_le64(seq);
883 * Serialize client metadata into waiting buffer space, using
884 * the format that userspace expects for map<string, string>
886 * ClientSession messages with metadata are v2
888 msg->hdr.version = cpu_to_le16(2);
889 msg->hdr.compat_version = cpu_to_le16(1);
891 /* The write pointer, following the session_head structure */
892 p = msg->front.iov_base + sizeof(*h);
894 /* Number of entries in the map */
895 ceph_encode_32(&p, metadata_key_count);
897 /* Two length-prefixed strings for each entry in the map */
898 for (i = 0; metadata[i][0] != NULL; ++i) {
899 size_t const key_len = strlen(metadata[i][0]);
900 size_t const val_len = strlen(metadata[i][1]);
902 ceph_encode_32(&p, key_len);
903 memcpy(p, metadata[i][0], key_len);
905 ceph_encode_32(&p, val_len);
906 memcpy(p, metadata[i][1], val_len);
914 * send session open request.
916 * called under mdsc->mutex
918 static int __open_session(struct ceph_mds_client *mdsc,
919 struct ceph_mds_session *session)
921 struct ceph_msg *msg;
923 int mds = session->s_mds;
925 /* wait for mds to go active? */
926 mstate = ceph_mdsmap_get_state(mdsc->mdsmap, mds);
927 dout("open_session to mds%d (%s)\n", mds,
928 ceph_mds_state_name(mstate));
929 session->s_state = CEPH_MDS_SESSION_OPENING;
930 session->s_renew_requested = jiffies;
932 /* send connect message */
933 msg = create_session_open_msg(mdsc, session->s_seq);
936 ceph_con_send(&session->s_con, msg);
941 * open sessions for any export targets for the given mds
943 * called under mdsc->mutex
945 static struct ceph_mds_session *
946 __open_export_target_session(struct ceph_mds_client *mdsc, int target)
948 struct ceph_mds_session *session;
950 session = __ceph_lookup_mds_session(mdsc, target);
952 session = register_session(mdsc, target);
956 if (session->s_state == CEPH_MDS_SESSION_NEW ||
957 session->s_state == CEPH_MDS_SESSION_CLOSING)
958 __open_session(mdsc, session);
963 struct ceph_mds_session *
964 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target)
966 struct ceph_mds_session *session;
968 dout("open_export_target_session to mds%d\n", target);
970 mutex_lock(&mdsc->mutex);
971 session = __open_export_target_session(mdsc, target);
972 mutex_unlock(&mdsc->mutex);
977 static void __open_export_target_sessions(struct ceph_mds_client *mdsc,
978 struct ceph_mds_session *session)
980 struct ceph_mds_info *mi;
981 struct ceph_mds_session *ts;
982 int i, mds = session->s_mds;
984 if (mds >= mdsc->mdsmap->m_max_mds)
987 mi = &mdsc->mdsmap->m_info[mds];
988 dout("open_export_target_sessions for mds%d (%d targets)\n",
989 session->s_mds, mi->num_export_targets);
991 for (i = 0; i < mi->num_export_targets; i++) {
992 ts = __open_export_target_session(mdsc, mi->export_targets[i]);
994 ceph_put_mds_session(ts);
998 void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
999 struct ceph_mds_session *session)
1001 mutex_lock(&mdsc->mutex);
1002 __open_export_target_sessions(mdsc, session);
1003 mutex_unlock(&mdsc->mutex);
1010 /* caller holds s_cap_lock, we drop it */
1011 static void cleanup_cap_releases(struct ceph_mds_client *mdsc,
1012 struct ceph_mds_session *session)
1013 __releases(session->s_cap_lock)
1015 LIST_HEAD(tmp_list);
1016 list_splice_init(&session->s_cap_releases, &tmp_list);
1017 session->s_num_cap_releases = 0;
1018 spin_unlock(&session->s_cap_lock);
1020 dout("cleanup_cap_releases mds%d\n", session->s_mds);
1021 while (!list_empty(&tmp_list)) {
1022 struct ceph_cap *cap;
1023 /* zero out the in-progress message */
1024 cap = list_first_entry(&tmp_list,
1025 struct ceph_cap, session_caps);
1026 list_del(&cap->session_caps);
1027 ceph_put_cap(mdsc, cap);
1031 static void cleanup_session_requests(struct ceph_mds_client *mdsc,
1032 struct ceph_mds_session *session)
1034 struct ceph_mds_request *req;
1037 dout("cleanup_session_requests mds%d\n", session->s_mds);
1038 mutex_lock(&mdsc->mutex);
1039 while (!list_empty(&session->s_unsafe)) {
1040 req = list_first_entry(&session->s_unsafe,
1041 struct ceph_mds_request, r_unsafe_item);
1042 pr_warn_ratelimited(" dropping unsafe request %llu\n",
1044 __unregister_request(mdsc, req);
1046 /* zero r_attempts, so kick_requests() will re-send requests */
1047 p = rb_first(&mdsc->request_tree);
1049 req = rb_entry(p, struct ceph_mds_request, r_node);
1051 if (req->r_session &&
1052 req->r_session->s_mds == session->s_mds)
1053 req->r_attempts = 0;
1055 mutex_unlock(&mdsc->mutex);
1059 * Helper to safely iterate over all caps associated with a session, with
1060 * special care taken to handle a racing __ceph_remove_cap().
1062 * Caller must hold session s_mutex.
1064 static int iterate_session_caps(struct ceph_mds_session *session,
1065 int (*cb)(struct inode *, struct ceph_cap *,
1068 struct list_head *p;
1069 struct ceph_cap *cap;
1070 struct inode *inode, *last_inode = NULL;
1071 struct ceph_cap *old_cap = NULL;
1074 dout("iterate_session_caps %p mds%d\n", session, session->s_mds);
1075 spin_lock(&session->s_cap_lock);
1076 p = session->s_caps.next;
1077 while (p != &session->s_caps) {
1078 cap = list_entry(p, struct ceph_cap, session_caps);
1079 inode = igrab(&cap->ci->vfs_inode);
1084 session->s_cap_iterator = cap;
1085 spin_unlock(&session->s_cap_lock);
1092 ceph_put_cap(session->s_mdsc, old_cap);
1096 ret = cb(inode, cap, arg);
1099 spin_lock(&session->s_cap_lock);
1101 if (cap->ci == NULL) {
1102 dout("iterate_session_caps finishing cap %p removal\n",
1104 BUG_ON(cap->session != session);
1105 cap->session = NULL;
1106 list_del_init(&cap->session_caps);
1107 session->s_nr_caps--;
1108 if (cap->queue_release) {
1109 list_add_tail(&cap->session_caps,
1110 &session->s_cap_releases);
1111 session->s_num_cap_releases++;
1113 old_cap = cap; /* put_cap it w/o locks held */
1121 session->s_cap_iterator = NULL;
1122 spin_unlock(&session->s_cap_lock);
1126 ceph_put_cap(session->s_mdsc, old_cap);
1131 static int remove_session_caps_cb(struct inode *inode, struct ceph_cap *cap,
1134 struct ceph_fs_client *fsc = (struct ceph_fs_client *)arg;
1135 struct ceph_inode_info *ci = ceph_inode(inode);
1136 LIST_HEAD(to_remove);
1138 bool invalidate = false;
1140 dout("removing cap %p, ci is %p, inode is %p\n",
1141 cap, ci, &ci->vfs_inode);
1142 spin_lock(&ci->i_ceph_lock);
1143 __ceph_remove_cap(cap, false);
1144 if (!ci->i_auth_cap) {
1145 struct ceph_cap_flush *cf;
1146 struct ceph_mds_client *mdsc = fsc->mdsc;
1148 ci->i_ceph_flags |= CEPH_I_CAP_DROPPED;
1150 if (ci->i_wrbuffer_ref > 0 &&
1151 ACCESS_ONCE(fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
1154 while (!list_empty(&ci->i_cap_flush_list)) {
1155 cf = list_first_entry(&ci->i_cap_flush_list,
1156 struct ceph_cap_flush, i_list);
1157 list_move(&cf->i_list, &to_remove);
1160 spin_lock(&mdsc->cap_dirty_lock);
1162 list_for_each_entry(cf, &to_remove, i_list)
1163 list_del(&cf->g_list);
1165 if (!list_empty(&ci->i_dirty_item)) {
1166 pr_warn_ratelimited(
1167 " dropping dirty %s state for %p %lld\n",
1168 ceph_cap_string(ci->i_dirty_caps),
1169 inode, ceph_ino(inode));
1170 ci->i_dirty_caps = 0;
1171 list_del_init(&ci->i_dirty_item);
1174 if (!list_empty(&ci->i_flushing_item)) {
1175 pr_warn_ratelimited(
1176 " dropping dirty+flushing %s state for %p %lld\n",
1177 ceph_cap_string(ci->i_flushing_caps),
1178 inode, ceph_ino(inode));
1179 ci->i_flushing_caps = 0;
1180 list_del_init(&ci->i_flushing_item);
1181 mdsc->num_cap_flushing--;
1184 spin_unlock(&mdsc->cap_dirty_lock);
1186 if (!ci->i_dirty_caps && ci->i_prealloc_cap_flush) {
1187 list_add(&ci->i_prealloc_cap_flush->i_list, &to_remove);
1188 ci->i_prealloc_cap_flush = NULL;
1192 ci->i_wrbuffer_ref_head == 0 &&
1193 ci->i_wr_ref == 0 &&
1194 ci->i_dirty_caps == 0 &&
1195 ci->i_flushing_caps == 0) {
1196 ceph_put_snap_context(ci->i_head_snapc);
1197 ci->i_head_snapc = NULL;
1200 spin_unlock(&ci->i_ceph_lock);
1201 while (!list_empty(&to_remove)) {
1202 struct ceph_cap_flush *cf;
1203 cf = list_first_entry(&to_remove,
1204 struct ceph_cap_flush, i_list);
1205 list_del(&cf->i_list);
1206 ceph_free_cap_flush(cf);
1209 wake_up_all(&ci->i_cap_wq);
1211 ceph_queue_invalidate(inode);
1218 * caller must hold session s_mutex
1220 static void remove_session_caps(struct ceph_mds_session *session)
1222 struct ceph_fs_client *fsc = session->s_mdsc->fsc;
1223 struct super_block *sb = fsc->sb;
1224 dout("remove_session_caps on %p\n", session);
1225 iterate_session_caps(session, remove_session_caps_cb, fsc);
1227 wake_up_all(&fsc->mdsc->cap_flushing_wq);
1229 spin_lock(&session->s_cap_lock);
1230 if (session->s_nr_caps > 0) {
1231 struct inode *inode;
1232 struct ceph_cap *cap, *prev = NULL;
1233 struct ceph_vino vino;
1235 * iterate_session_caps() skips inodes that are being
1236 * deleted, we need to wait until deletions are complete.
1237 * __wait_on_freeing_inode() is designed for the job,
1238 * but it is not exported, so use lookup inode function
1241 while (!list_empty(&session->s_caps)) {
1242 cap = list_entry(session->s_caps.next,
1243 struct ceph_cap, session_caps);
1247 vino = cap->ci->i_vino;
1248 spin_unlock(&session->s_cap_lock);
1250 inode = ceph_find_inode(sb, vino);
1253 spin_lock(&session->s_cap_lock);
1257 // drop cap expires and unlock s_cap_lock
1258 cleanup_cap_releases(session->s_mdsc, session);
1260 BUG_ON(session->s_nr_caps > 0);
1261 BUG_ON(!list_empty(&session->s_cap_flushing));
1265 * wake up any threads waiting on this session's caps. if the cap is
1266 * old (didn't get renewed on the client reconnect), remove it now.
1268 * caller must hold s_mutex.
1270 static int wake_up_session_cb(struct inode *inode, struct ceph_cap *cap,
1273 struct ceph_inode_info *ci = ceph_inode(inode);
1276 spin_lock(&ci->i_ceph_lock);
1277 ci->i_wanted_max_size = 0;
1278 ci->i_requested_max_size = 0;
1279 spin_unlock(&ci->i_ceph_lock);
1281 wake_up_all(&ci->i_cap_wq);
1285 static void wake_up_session_caps(struct ceph_mds_session *session,
1288 dout("wake_up_session_caps %p mds%d\n", session, session->s_mds);
1289 iterate_session_caps(session, wake_up_session_cb,
1290 (void *)(unsigned long)reconnect);
1294 * Send periodic message to MDS renewing all currently held caps. The
1295 * ack will reset the expiration for all caps from this session.
1297 * caller holds s_mutex
1299 static int send_renew_caps(struct ceph_mds_client *mdsc,
1300 struct ceph_mds_session *session)
1302 struct ceph_msg *msg;
1305 if (time_after_eq(jiffies, session->s_cap_ttl) &&
1306 time_after_eq(session->s_cap_ttl, session->s_renew_requested))
1307 pr_info("mds%d caps stale\n", session->s_mds);
1308 session->s_renew_requested = jiffies;
1310 /* do not try to renew caps until a recovering mds has reconnected
1311 * with its clients. */
1312 state = ceph_mdsmap_get_state(mdsc->mdsmap, session->s_mds);
1313 if (state < CEPH_MDS_STATE_RECONNECT) {
1314 dout("send_renew_caps ignoring mds%d (%s)\n",
1315 session->s_mds, ceph_mds_state_name(state));
1319 dout("send_renew_caps to mds%d (%s)\n", session->s_mds,
1320 ceph_mds_state_name(state));
1321 msg = create_session_msg(CEPH_SESSION_REQUEST_RENEWCAPS,
1322 ++session->s_renew_seq);
1325 ceph_con_send(&session->s_con, msg);
1329 static int send_flushmsg_ack(struct ceph_mds_client *mdsc,
1330 struct ceph_mds_session *session, u64 seq)
1332 struct ceph_msg *msg;
1334 dout("send_flushmsg_ack to mds%d (%s)s seq %lld\n",
1335 session->s_mds, ceph_session_state_name(session->s_state), seq);
1336 msg = create_session_msg(CEPH_SESSION_FLUSHMSG_ACK, seq);
1339 ceph_con_send(&session->s_con, msg);
1345 * Note new cap ttl, and any transition from stale -> not stale (fresh?).
1347 * Called under session->s_mutex
1349 static void renewed_caps(struct ceph_mds_client *mdsc,
1350 struct ceph_mds_session *session, int is_renew)
1355 spin_lock(&session->s_cap_lock);
1356 was_stale = is_renew && time_after_eq(jiffies, session->s_cap_ttl);
1358 session->s_cap_ttl = session->s_renew_requested +
1359 mdsc->mdsmap->m_session_timeout*HZ;
1362 if (time_before(jiffies, session->s_cap_ttl)) {
1363 pr_info("mds%d caps renewed\n", session->s_mds);
1366 pr_info("mds%d caps still stale\n", session->s_mds);
1369 dout("renewed_caps mds%d ttl now %lu, was %s, now %s\n",
1370 session->s_mds, session->s_cap_ttl, was_stale ? "stale" : "fresh",
1371 time_before(jiffies, session->s_cap_ttl) ? "stale" : "fresh");
1372 spin_unlock(&session->s_cap_lock);
1375 wake_up_session_caps(session, 0);
1379 * send a session close request
1381 static int request_close_session(struct ceph_mds_client *mdsc,
1382 struct ceph_mds_session *session)
1384 struct ceph_msg *msg;
1386 dout("request_close_session mds%d state %s seq %lld\n",
1387 session->s_mds, ceph_session_state_name(session->s_state),
1389 msg = create_session_msg(CEPH_SESSION_REQUEST_CLOSE, session->s_seq);
1392 ceph_con_send(&session->s_con, msg);
1397 * Called with s_mutex held.
1399 static int __close_session(struct ceph_mds_client *mdsc,
1400 struct ceph_mds_session *session)
1402 if (session->s_state >= CEPH_MDS_SESSION_CLOSING)
1404 session->s_state = CEPH_MDS_SESSION_CLOSING;
1405 return request_close_session(mdsc, session);
1408 static bool drop_negative_children(struct dentry *dentry)
1410 struct dentry *child;
1411 bool all_negative = true;
1413 if (!d_is_dir(dentry))
1416 spin_lock(&dentry->d_lock);
1417 list_for_each_entry(child, &dentry->d_subdirs, d_child) {
1418 if (d_really_is_positive(child)) {
1419 all_negative = false;
1423 spin_unlock(&dentry->d_lock);
1426 shrink_dcache_parent(dentry);
1428 return all_negative;
1432 * Trim old(er) caps.
1434 * Because we can't cache an inode without one or more caps, we do
1435 * this indirectly: if a cap is unused, we prune its aliases, at which
1436 * point the inode will hopefully get dropped to.
1438 * Yes, this is a bit sloppy. Our only real goal here is to respond to
1439 * memory pressure from the MDS, though, so it needn't be perfect.
1441 static int trim_caps_cb(struct inode *inode, struct ceph_cap *cap, void *arg)
1443 struct ceph_mds_session *session = arg;
1444 struct ceph_inode_info *ci = ceph_inode(inode);
1445 int used, wanted, oissued, mine;
1447 if (session->s_trim_caps <= 0)
1450 spin_lock(&ci->i_ceph_lock);
1451 mine = cap->issued | cap->implemented;
1452 used = __ceph_caps_used(ci);
1453 wanted = __ceph_caps_file_wanted(ci);
1454 oissued = __ceph_caps_issued_other(ci, cap);
1456 dout("trim_caps_cb %p cap %p mine %s oissued %s used %s wanted %s\n",
1457 inode, cap, ceph_cap_string(mine), ceph_cap_string(oissued),
1458 ceph_cap_string(used), ceph_cap_string(wanted));
1459 if (cap == ci->i_auth_cap) {
1460 if (ci->i_dirty_caps || ci->i_flushing_caps ||
1461 !list_empty(&ci->i_cap_snaps))
1463 if ((used | wanted) & CEPH_CAP_ANY_WR)
1466 /* The inode has cached pages, but it's no longer used.
1467 * we can safely drop it */
1468 if (wanted == 0 && used == CEPH_CAP_FILE_CACHE &&
1469 !(oissued & CEPH_CAP_FILE_CACHE)) {
1473 if ((used | wanted) & ~oissued & mine)
1474 goto out; /* we need these caps */
1477 /* we aren't the only cap.. just remove us */
1478 __ceph_remove_cap(cap, true);
1479 session->s_trim_caps--;
1481 struct dentry *dentry;
1482 /* try dropping referring dentries */
1483 spin_unlock(&ci->i_ceph_lock);
1484 dentry = d_find_any_alias(inode);
1485 if (dentry && drop_negative_children(dentry)) {
1488 d_prune_aliases(inode);
1489 count = atomic_read(&inode->i_count);
1491 session->s_trim_caps--;
1492 dout("trim_caps_cb %p cap %p pruned, count now %d\n",
1501 spin_unlock(&ci->i_ceph_lock);
1506 * Trim session cap count down to some max number.
1508 static int trim_caps(struct ceph_mds_client *mdsc,
1509 struct ceph_mds_session *session,
1512 int trim_caps = session->s_nr_caps - max_caps;
1514 dout("trim_caps mds%d start: %d / %d, trim %d\n",
1515 session->s_mds, session->s_nr_caps, max_caps, trim_caps);
1516 if (trim_caps > 0) {
1517 session->s_trim_caps = trim_caps;
1518 iterate_session_caps(session, trim_caps_cb, session);
1519 dout("trim_caps mds%d done: %d / %d, trimmed %d\n",
1520 session->s_mds, session->s_nr_caps, max_caps,
1521 trim_caps - session->s_trim_caps);
1522 session->s_trim_caps = 0;
1525 ceph_send_cap_releases(mdsc, session);
1529 static int check_caps_flush(struct ceph_mds_client *mdsc,
1534 spin_lock(&mdsc->cap_dirty_lock);
1535 if (!list_empty(&mdsc->cap_flush_list)) {
1536 struct ceph_cap_flush *cf =
1537 list_first_entry(&mdsc->cap_flush_list,
1538 struct ceph_cap_flush, g_list);
1539 if (cf->tid <= want_flush_tid) {
1540 dout("check_caps_flush still flushing tid "
1541 "%llu <= %llu\n", cf->tid, want_flush_tid);
1545 spin_unlock(&mdsc->cap_dirty_lock);
1550 * flush all dirty inode data to disk.
1552 * returns true if we've flushed through want_flush_tid
1554 static void wait_caps_flush(struct ceph_mds_client *mdsc,
1557 dout("check_caps_flush want %llu\n", want_flush_tid);
1559 wait_event(mdsc->cap_flushing_wq,
1560 check_caps_flush(mdsc, want_flush_tid));
1562 dout("check_caps_flush ok, flushed thru %llu\n", want_flush_tid);
1566 * called under s_mutex
1568 void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
1569 struct ceph_mds_session *session)
1571 struct ceph_msg *msg = NULL;
1572 struct ceph_mds_cap_release *head;
1573 struct ceph_mds_cap_item *item;
1574 struct ceph_cap *cap;
1575 LIST_HEAD(tmp_list);
1576 int num_cap_releases;
1578 spin_lock(&session->s_cap_lock);
1580 list_splice_init(&session->s_cap_releases, &tmp_list);
1581 num_cap_releases = session->s_num_cap_releases;
1582 session->s_num_cap_releases = 0;
1583 spin_unlock(&session->s_cap_lock);
1585 while (!list_empty(&tmp_list)) {
1587 msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPRELEASE,
1588 PAGE_SIZE, GFP_NOFS, false);
1591 head = msg->front.iov_base;
1592 head->num = cpu_to_le32(0);
1593 msg->front.iov_len = sizeof(*head);
1595 cap = list_first_entry(&tmp_list, struct ceph_cap,
1597 list_del(&cap->session_caps);
1600 head = msg->front.iov_base;
1601 le32_add_cpu(&head->num, 1);
1602 item = msg->front.iov_base + msg->front.iov_len;
1603 item->ino = cpu_to_le64(cap->cap_ino);
1604 item->cap_id = cpu_to_le64(cap->cap_id);
1605 item->migrate_seq = cpu_to_le32(cap->mseq);
1606 item->seq = cpu_to_le32(cap->issue_seq);
1607 msg->front.iov_len += sizeof(*item);
1609 ceph_put_cap(mdsc, cap);
1611 if (le32_to_cpu(head->num) == CEPH_CAPS_PER_RELEASE) {
1612 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1613 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1614 ceph_con_send(&session->s_con, msg);
1619 BUG_ON(num_cap_releases != 0);
1621 spin_lock(&session->s_cap_lock);
1622 if (!list_empty(&session->s_cap_releases))
1624 spin_unlock(&session->s_cap_lock);
1627 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
1628 dout("send_cap_releases mds%d %p\n", session->s_mds, msg);
1629 ceph_con_send(&session->s_con, msg);
1633 pr_err("send_cap_releases mds%d, failed to allocate message\n",
1635 spin_lock(&session->s_cap_lock);
1636 list_splice(&tmp_list, &session->s_cap_releases);
1637 session->s_num_cap_releases += num_cap_releases;
1638 spin_unlock(&session->s_cap_lock);
1645 int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
1648 struct ceph_inode_info *ci = ceph_inode(dir);
1649 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
1650 struct ceph_mount_options *opt = req->r_mdsc->fsc->mount_options;
1651 size_t size = sizeof(struct ceph_mds_reply_dir_entry);
1652 int order, num_entries;
1654 spin_lock(&ci->i_ceph_lock);
1655 num_entries = ci->i_files + ci->i_subdirs;
1656 spin_unlock(&ci->i_ceph_lock);
1657 num_entries = max(num_entries, 1);
1658 num_entries = min(num_entries, opt->max_readdir);
1660 order = get_order(size * num_entries);
1661 while (order >= 0) {
1662 rinfo->dir_entries = (void*)__get_free_pages(GFP_KERNEL |
1665 if (rinfo->dir_entries)
1669 if (!rinfo->dir_entries)
1672 num_entries = (PAGE_SIZE << order) / size;
1673 num_entries = min(num_entries, opt->max_readdir);
1675 rinfo->dir_buf_size = PAGE_SIZE << order;
1676 req->r_num_caps = num_entries + 1;
1677 req->r_args.readdir.max_entries = cpu_to_le32(num_entries);
1678 req->r_args.readdir.max_bytes = cpu_to_le32(opt->max_readdir_bytes);
1683 * Create an mds request.
1685 struct ceph_mds_request *
1686 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode)
1688 struct ceph_mds_request *req = kzalloc(sizeof(*req), GFP_NOFS);
1691 return ERR_PTR(-ENOMEM);
1693 mutex_init(&req->r_fill_mutex);
1695 req->r_started = jiffies;
1696 req->r_resend_mds = -1;
1697 INIT_LIST_HEAD(&req->r_unsafe_dir_item);
1698 INIT_LIST_HEAD(&req->r_unsafe_target_item);
1700 kref_init(&req->r_kref);
1701 RB_CLEAR_NODE(&req->r_node);
1702 INIT_LIST_HEAD(&req->r_wait);
1703 init_completion(&req->r_completion);
1704 init_completion(&req->r_safe_completion);
1705 INIT_LIST_HEAD(&req->r_unsafe_item);
1707 req->r_stamp = current_fs_time(mdsc->fsc->sb);
1710 req->r_direct_mode = mode;
1715 * return oldest (lowest) request, tid in request tree, 0 if none.
1717 * called under mdsc->mutex.
1719 static struct ceph_mds_request *__get_oldest_req(struct ceph_mds_client *mdsc)
1721 if (RB_EMPTY_ROOT(&mdsc->request_tree))
1723 return rb_entry(rb_first(&mdsc->request_tree),
1724 struct ceph_mds_request, r_node);
1727 static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc)
1729 return mdsc->oldest_tid;
1733 * Build a dentry's path. Allocate on heap; caller must kfree. Based
1734 * on build_path_from_dentry in fs/cifs/dir.c.
1736 * If @stop_on_nosnap, generate path relative to the first non-snapped
1739 * Encode hidden .snap dirs as a double /, i.e.
1740 * foo/.snap/bar -> foo//bar
1742 char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
1745 struct dentry *temp;
1751 return ERR_PTR(-EINVAL);
1755 seq = read_seqbegin(&rename_lock);
1757 for (temp = dentry; !IS_ROOT(temp);) {
1758 struct inode *inode = d_inode(temp);
1759 if (inode && ceph_snap(inode) == CEPH_SNAPDIR)
1760 len++; /* slash only */
1761 else if (stop_on_nosnap && inode &&
1762 ceph_snap(inode) == CEPH_NOSNAP)
1765 len += 1 + temp->d_name.len;
1766 temp = temp->d_parent;
1770 len--; /* no leading '/' */
1772 path = kmalloc(len+1, GFP_NOFS);
1774 return ERR_PTR(-ENOMEM);
1776 path[pos] = 0; /* trailing null */
1778 for (temp = dentry; !IS_ROOT(temp) && pos != 0; ) {
1779 struct inode *inode;
1781 spin_lock(&temp->d_lock);
1782 inode = d_inode(temp);
1783 if (inode && ceph_snap(inode) == CEPH_SNAPDIR) {
1784 dout("build_path path+%d: %p SNAPDIR\n",
1786 } else if (stop_on_nosnap && inode &&
1787 ceph_snap(inode) == CEPH_NOSNAP) {
1788 spin_unlock(&temp->d_lock);
1791 pos -= temp->d_name.len;
1793 spin_unlock(&temp->d_lock);
1796 strncpy(path + pos, temp->d_name.name,
1799 spin_unlock(&temp->d_lock);
1802 temp = temp->d_parent;
1805 if (pos != 0 || read_seqretry(&rename_lock, seq)) {
1806 pr_err("build_path did not end path lookup where "
1807 "expected, namelen is %d, pos is %d\n", len, pos);
1808 /* presumably this is only possible if racing with a
1809 rename of one of the parent directories (we can not
1810 lock the dentries above us to prevent this, but
1811 retrying should be harmless) */
1816 *base = ceph_ino(d_inode(temp));
1818 dout("build_path on %p %d built %llx '%.*s'\n",
1819 dentry, d_count(dentry), *base, len, path);
1823 static int build_dentry_path(struct dentry *dentry,
1824 const char **ppath, int *ppathlen, u64 *pino,
1831 dir = d_inode_rcu(dentry->d_parent);
1832 if (dir && ceph_snap(dir) == CEPH_NOSNAP) {
1833 *pino = ceph_ino(dir);
1835 *ppath = dentry->d_name.name;
1836 *ppathlen = dentry->d_name.len;
1840 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1842 return PTR_ERR(path);
1848 static int build_inode_path(struct inode *inode,
1849 const char **ppath, int *ppathlen, u64 *pino,
1852 struct dentry *dentry;
1855 if (ceph_snap(inode) == CEPH_NOSNAP) {
1856 *pino = ceph_ino(inode);
1860 dentry = d_find_alias(inode);
1861 path = ceph_mdsc_build_path(dentry, ppathlen, pino, 1);
1864 return PTR_ERR(path);
1871 * request arguments may be specified via an inode *, a dentry *, or
1872 * an explicit ino+path.
1874 static int set_request_path_attr(struct inode *rinode, struct dentry *rdentry,
1875 const char *rpath, u64 rino,
1876 const char **ppath, int *pathlen,
1877 u64 *ino, int *freepath)
1882 r = build_inode_path(rinode, ppath, pathlen, ino, freepath);
1883 dout(" inode %p %llx.%llx\n", rinode, ceph_ino(rinode),
1885 } else if (rdentry) {
1886 r = build_dentry_path(rdentry, ppath, pathlen, ino, freepath);
1887 dout(" dentry %p %llx/%.*s\n", rdentry, *ino, *pathlen,
1889 } else if (rpath || rino) {
1892 *pathlen = rpath ? strlen(rpath) : 0;
1893 dout(" path %.*s\n", *pathlen, rpath);
1900 * called under mdsc->mutex
1902 static struct ceph_msg *create_request_message(struct ceph_mds_client *mdsc,
1903 struct ceph_mds_request *req,
1904 int mds, bool drop_cap_releases)
1906 struct ceph_msg *msg;
1907 struct ceph_mds_request_head *head;
1908 const char *path1 = NULL;
1909 const char *path2 = NULL;
1910 u64 ino1 = 0, ino2 = 0;
1911 int pathlen1 = 0, pathlen2 = 0;
1912 int freepath1 = 0, freepath2 = 0;
1918 ret = set_request_path_attr(req->r_inode, req->r_dentry,
1919 req->r_path1, req->r_ino1.ino,
1920 &path1, &pathlen1, &ino1, &freepath1);
1926 ret = set_request_path_attr(NULL, req->r_old_dentry,
1927 req->r_path2, req->r_ino2.ino,
1928 &path2, &pathlen2, &ino2, &freepath2);
1934 len = sizeof(*head) +
1935 pathlen1 + pathlen2 + 2*(1 + sizeof(u32) + sizeof(u64)) +
1936 sizeof(struct ceph_timespec);
1938 /* calculate (max) length for cap releases */
1939 len += sizeof(struct ceph_mds_request_release) *
1940 (!!req->r_inode_drop + !!req->r_dentry_drop +
1941 !!req->r_old_inode_drop + !!req->r_old_dentry_drop);
1942 if (req->r_dentry_drop)
1943 len += req->r_dentry->d_name.len;
1944 if (req->r_old_dentry_drop)
1945 len += req->r_old_dentry->d_name.len;
1947 msg = ceph_msg_new(CEPH_MSG_CLIENT_REQUEST, len, GFP_NOFS, false);
1949 msg = ERR_PTR(-ENOMEM);
1953 msg->hdr.version = cpu_to_le16(2);
1954 msg->hdr.tid = cpu_to_le64(req->r_tid);
1956 head = msg->front.iov_base;
1957 p = msg->front.iov_base + sizeof(*head);
1958 end = msg->front.iov_base + msg->front.iov_len;
1960 head->mdsmap_epoch = cpu_to_le32(mdsc->mdsmap->m_epoch);
1961 head->op = cpu_to_le32(req->r_op);
1962 head->caller_uid = cpu_to_le32(from_kuid(&init_user_ns, req->r_uid));
1963 head->caller_gid = cpu_to_le32(from_kgid(&init_user_ns, req->r_gid));
1964 head->args = req->r_args;
1966 ceph_encode_filepath(&p, end, ino1, path1);
1967 ceph_encode_filepath(&p, end, ino2, path2);
1969 /* make note of release offset, in case we need to replay */
1970 req->r_request_release_offset = p - msg->front.iov_base;
1974 if (req->r_inode_drop)
1975 releases += ceph_encode_inode_release(&p,
1976 req->r_inode ? req->r_inode : d_inode(req->r_dentry),
1977 mds, req->r_inode_drop, req->r_inode_unless, 0);
1978 if (req->r_dentry_drop)
1979 releases += ceph_encode_dentry_release(&p, req->r_dentry,
1980 mds, req->r_dentry_drop, req->r_dentry_unless);
1981 if (req->r_old_dentry_drop)
1982 releases += ceph_encode_dentry_release(&p, req->r_old_dentry,
1983 mds, req->r_old_dentry_drop, req->r_old_dentry_unless);
1984 if (req->r_old_inode_drop)
1985 releases += ceph_encode_inode_release(&p,
1986 d_inode(req->r_old_dentry),
1987 mds, req->r_old_inode_drop, req->r_old_inode_unless, 0);
1989 if (drop_cap_releases) {
1991 p = msg->front.iov_base + req->r_request_release_offset;
1994 head->num_releases = cpu_to_le16(releases);
1998 struct ceph_timespec ts;
1999 ceph_encode_timespec(&ts, &req->r_stamp);
2000 ceph_encode_copy(&p, &ts, sizeof(ts));
2004 msg->front.iov_len = p - msg->front.iov_base;
2005 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2007 if (req->r_pagelist) {
2008 struct ceph_pagelist *pagelist = req->r_pagelist;
2009 atomic_inc(&pagelist->refcnt);
2010 ceph_msg_data_add_pagelist(msg, pagelist);
2011 msg->hdr.data_len = cpu_to_le32(pagelist->length);
2013 msg->hdr.data_len = 0;
2016 msg->hdr.data_off = cpu_to_le16(0);
2020 kfree((char *)path2);
2023 kfree((char *)path1);
2029 * called under mdsc->mutex if error, under no mutex if
2032 static void complete_request(struct ceph_mds_client *mdsc,
2033 struct ceph_mds_request *req)
2035 if (req->r_callback)
2036 req->r_callback(mdsc, req);
2038 complete_all(&req->r_completion);
2042 * called under mdsc->mutex
2044 static int __prepare_send_request(struct ceph_mds_client *mdsc,
2045 struct ceph_mds_request *req,
2046 int mds, bool drop_cap_releases)
2048 struct ceph_mds_request_head *rhead;
2049 struct ceph_msg *msg;
2054 struct ceph_cap *cap =
2055 ceph_get_cap_for_mds(ceph_inode(req->r_inode), mds);
2058 req->r_sent_on_mseq = cap->mseq;
2060 req->r_sent_on_mseq = -1;
2062 dout("prepare_send_request %p tid %lld %s (attempt %d)\n", req,
2063 req->r_tid, ceph_mds_op_name(req->r_op), req->r_attempts);
2065 if (req->r_got_unsafe) {
2068 * Replay. Do not regenerate message (and rebuild
2069 * paths, etc.); just use the original message.
2070 * Rebuilding paths will break for renames because
2071 * d_move mangles the src name.
2073 msg = req->r_request;
2074 rhead = msg->front.iov_base;
2076 flags = le32_to_cpu(rhead->flags);
2077 flags |= CEPH_MDS_FLAG_REPLAY;
2078 rhead->flags = cpu_to_le32(flags);
2080 if (req->r_target_inode)
2081 rhead->ino = cpu_to_le64(ceph_ino(req->r_target_inode));
2083 rhead->num_retry = req->r_attempts - 1;
2085 /* remove cap/dentry releases from message */
2086 rhead->num_releases = 0;
2089 p = msg->front.iov_base + req->r_request_release_offset;
2091 struct ceph_timespec ts;
2092 ceph_encode_timespec(&ts, &req->r_stamp);
2093 ceph_encode_copy(&p, &ts, sizeof(ts));
2096 msg->front.iov_len = p - msg->front.iov_base;
2097 msg->hdr.front_len = cpu_to_le32(msg->front.iov_len);
2101 if (req->r_request) {
2102 ceph_msg_put(req->r_request);
2103 req->r_request = NULL;
2105 msg = create_request_message(mdsc, req, mds, drop_cap_releases);
2107 req->r_err = PTR_ERR(msg);
2108 return PTR_ERR(msg);
2110 req->r_request = msg;
2112 rhead = msg->front.iov_base;
2113 rhead->oldest_client_tid = cpu_to_le64(__get_oldest_tid(mdsc));
2114 if (req->r_got_unsafe)
2115 flags |= CEPH_MDS_FLAG_REPLAY;
2116 if (req->r_locked_dir)
2117 flags |= CEPH_MDS_FLAG_WANT_DENTRY;
2118 rhead->flags = cpu_to_le32(flags);
2119 rhead->num_fwd = req->r_num_fwd;
2120 rhead->num_retry = req->r_attempts - 1;
2123 dout(" r_locked_dir = %p\n", req->r_locked_dir);
2128 * send request, or put it on the appropriate wait list.
2130 static int __do_request(struct ceph_mds_client *mdsc,
2131 struct ceph_mds_request *req)
2133 struct ceph_mds_session *session = NULL;
2137 if (req->r_err || req->r_got_result) {
2139 __unregister_request(mdsc, req);
2143 if (req->r_timeout &&
2144 time_after_eq(jiffies, req->r_started + req->r_timeout)) {
2145 dout("do_request timed out\n");
2149 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN) {
2150 dout("do_request forced umount\n");
2155 put_request_session(req);
2157 mds = __choose_mds(mdsc, req);
2159 ceph_mdsmap_get_state(mdsc->mdsmap, mds) < CEPH_MDS_STATE_ACTIVE) {
2160 if (mdsc->mdsmap_err) {
2161 err = mdsc->mdsmap_err;
2162 dout("do_request mdsmap err %d\n", err);
2165 dout("do_request no mds or not active, waiting for map\n");
2166 list_add(&req->r_wait, &mdsc->waiting_for_map);
2170 /* get, open session */
2171 session = __ceph_lookup_mds_session(mdsc, mds);
2173 session = register_session(mdsc, mds);
2174 if (IS_ERR(session)) {
2175 err = PTR_ERR(session);
2179 req->r_session = get_session(session);
2181 dout("do_request mds%d session %p state %s\n", mds, session,
2182 ceph_session_state_name(session->s_state));
2183 if (session->s_state != CEPH_MDS_SESSION_OPEN &&
2184 session->s_state != CEPH_MDS_SESSION_HUNG) {
2185 if (session->s_state == CEPH_MDS_SESSION_REJECTED) {
2189 if (session->s_state == CEPH_MDS_SESSION_NEW ||
2190 session->s_state == CEPH_MDS_SESSION_CLOSING)
2191 __open_session(mdsc, session);
2192 list_add(&req->r_wait, &session->s_waiting);
2197 req->r_resend_mds = -1; /* forget any previous mds hint */
2199 if (req->r_request_started == 0) /* note request start time */
2200 req->r_request_started = jiffies;
2202 err = __prepare_send_request(mdsc, req, mds, false);
2204 ceph_msg_get(req->r_request);
2205 ceph_con_send(&session->s_con, req->r_request);
2209 ceph_put_mds_session(session);
2212 dout("__do_request early error %d\n", err);
2214 complete_request(mdsc, req);
2215 __unregister_request(mdsc, req);
2222 * called under mdsc->mutex
2224 static void __wake_requests(struct ceph_mds_client *mdsc,
2225 struct list_head *head)
2227 struct ceph_mds_request *req;
2228 LIST_HEAD(tmp_list);
2230 list_splice_init(head, &tmp_list);
2232 while (!list_empty(&tmp_list)) {
2233 req = list_entry(tmp_list.next,
2234 struct ceph_mds_request, r_wait);
2235 list_del_init(&req->r_wait);
2236 dout(" wake request %p tid %llu\n", req, req->r_tid);
2237 __do_request(mdsc, req);
2242 * Wake up threads with requests pending for @mds, so that they can
2243 * resubmit their requests to a possibly different mds.
2245 static void kick_requests(struct ceph_mds_client *mdsc, int mds)
2247 struct ceph_mds_request *req;
2248 struct rb_node *p = rb_first(&mdsc->request_tree);
2250 dout("kick_requests mds%d\n", mds);
2252 req = rb_entry(p, struct ceph_mds_request, r_node);
2254 if (req->r_got_unsafe)
2256 if (req->r_attempts > 0)
2257 continue; /* only new requests */
2258 if (req->r_session &&
2259 req->r_session->s_mds == mds) {
2260 dout(" kicking tid %llu\n", req->r_tid);
2261 list_del_init(&req->r_wait);
2262 __do_request(mdsc, req);
2267 void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
2268 struct ceph_mds_request *req)
2270 dout("submit_request on %p\n", req);
2271 mutex_lock(&mdsc->mutex);
2272 __register_request(mdsc, req, NULL);
2273 __do_request(mdsc, req);
2274 mutex_unlock(&mdsc->mutex);
2278 * Synchrously perform an mds request. Take care of all of the
2279 * session setup, forwarding, retry details.
2281 int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
2283 struct ceph_mds_request *req)
2287 dout("do_request on %p\n", req);
2289 /* take CAP_PIN refs for r_inode, r_locked_dir, r_old_dentry */
2291 ceph_get_cap_refs(ceph_inode(req->r_inode), CEPH_CAP_PIN);
2292 if (req->r_locked_dir)
2293 ceph_get_cap_refs(ceph_inode(req->r_locked_dir), CEPH_CAP_PIN);
2294 if (req->r_old_dentry_dir)
2295 ceph_get_cap_refs(ceph_inode(req->r_old_dentry_dir),
2299 mutex_lock(&mdsc->mutex);
2300 __register_request(mdsc, req, dir);
2301 __do_request(mdsc, req);
2309 mutex_unlock(&mdsc->mutex);
2310 dout("do_request waiting\n");
2311 if (!req->r_timeout && req->r_wait_for_completion) {
2312 err = req->r_wait_for_completion(mdsc, req);
2314 long timeleft = wait_for_completion_killable_timeout(
2316 ceph_timeout_jiffies(req->r_timeout));
2320 err = -EIO; /* timed out */
2322 err = timeleft; /* killed */
2324 dout("do_request waited, got %d\n", err);
2325 mutex_lock(&mdsc->mutex);
2327 /* only abort if we didn't race with a real reply */
2328 if (req->r_got_result) {
2329 err = le32_to_cpu(req->r_reply_info.head->result);
2330 } else if (err < 0) {
2331 dout("aborted request %lld with %d\n", req->r_tid, err);
2334 * ensure we aren't running concurrently with
2335 * ceph_fill_trace or ceph_readdir_prepopulate, which
2336 * rely on locks (dir mutex) held by our caller.
2338 mutex_lock(&req->r_fill_mutex);
2340 req->r_aborted = true;
2341 mutex_unlock(&req->r_fill_mutex);
2343 if (req->r_locked_dir &&
2344 (req->r_op & CEPH_MDS_OP_WRITE))
2345 ceph_invalidate_dir_request(req);
2351 mutex_unlock(&mdsc->mutex);
2352 dout("do_request %p done, result %d\n", req, err);
2357 * Invalidate dir's completeness, dentry lease state on an aborted MDS
2358 * namespace request.
2360 void ceph_invalidate_dir_request(struct ceph_mds_request *req)
2362 struct inode *inode = req->r_locked_dir;
2364 dout("invalidate_dir_request %p (complete, lease(s))\n", inode);
2366 ceph_dir_clear_complete(inode);
2368 ceph_invalidate_dentry_lease(req->r_dentry);
2369 if (req->r_old_dentry)
2370 ceph_invalidate_dentry_lease(req->r_old_dentry);
2376 * We take the session mutex and parse and process the reply immediately.
2377 * This preserves the logical ordering of replies, capabilities, etc., sent
2378 * by the MDS as they are applied to our local cache.
2380 static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
2382 struct ceph_mds_client *mdsc = session->s_mdsc;
2383 struct ceph_mds_request *req;
2384 struct ceph_mds_reply_head *head = msg->front.iov_base;
2385 struct ceph_mds_reply_info_parsed *rinfo; /* parsed reply info */
2386 struct ceph_snap_realm *realm;
2389 int mds = session->s_mds;
2391 if (msg->front.iov_len < sizeof(*head)) {
2392 pr_err("mdsc_handle_reply got corrupt (short) reply\n");
2397 /* get request, session */
2398 tid = le64_to_cpu(msg->hdr.tid);
2399 mutex_lock(&mdsc->mutex);
2400 req = lookup_get_request(mdsc, tid);
2402 dout("handle_reply on unknown tid %llu\n", tid);
2403 mutex_unlock(&mdsc->mutex);
2406 dout("handle_reply %p\n", req);
2408 /* correct session? */
2409 if (req->r_session != session) {
2410 pr_err("mdsc_handle_reply got %llu on session mds%d"
2411 " not mds%d\n", tid, session->s_mds,
2412 req->r_session ? req->r_session->s_mds : -1);
2413 mutex_unlock(&mdsc->mutex);
2418 if ((req->r_got_unsafe && !head->safe) ||
2419 (req->r_got_safe && head->safe)) {
2420 pr_warn("got a dup %s reply on %llu from mds%d\n",
2421 head->safe ? "safe" : "unsafe", tid, mds);
2422 mutex_unlock(&mdsc->mutex);
2425 if (req->r_got_safe) {
2426 pr_warn("got unsafe after safe on %llu from mds%d\n",
2428 mutex_unlock(&mdsc->mutex);
2432 result = le32_to_cpu(head->result);
2436 * if we're not talking to the authority, send to them
2437 * if the authority has changed while we weren't looking,
2438 * send to new authority
2439 * Otherwise we just have to return an ESTALE
2441 if (result == -ESTALE) {
2442 dout("got ESTALE on request %llu", req->r_tid);
2443 req->r_resend_mds = -1;
2444 if (req->r_direct_mode != USE_AUTH_MDS) {
2445 dout("not using auth, setting for that now");
2446 req->r_direct_mode = USE_AUTH_MDS;
2447 __do_request(mdsc, req);
2448 mutex_unlock(&mdsc->mutex);
2451 int mds = __choose_mds(mdsc, req);
2452 if (mds >= 0 && mds != req->r_session->s_mds) {
2453 dout("but auth changed, so resending");
2454 __do_request(mdsc, req);
2455 mutex_unlock(&mdsc->mutex);
2459 dout("have to return ESTALE on request %llu", req->r_tid);
2464 req->r_got_safe = true;
2465 __unregister_request(mdsc, req);
2467 if (req->r_got_unsafe) {
2469 * We already handled the unsafe response, now do the
2470 * cleanup. No need to examine the response; the MDS
2471 * doesn't include any result info in the safe
2472 * response. And even if it did, there is nothing
2473 * useful we could do with a revised return value.
2475 dout("got safe reply %llu, mds%d\n", tid, mds);
2477 /* last unsafe request during umount? */
2478 if (mdsc->stopping && !__get_oldest_req(mdsc))
2479 complete_all(&mdsc->safe_umount_waiters);
2480 mutex_unlock(&mdsc->mutex);
2484 req->r_got_unsafe = true;
2485 list_add_tail(&req->r_unsafe_item, &req->r_session->s_unsafe);
2486 if (req->r_unsafe_dir) {
2487 struct ceph_inode_info *ci =
2488 ceph_inode(req->r_unsafe_dir);
2489 spin_lock(&ci->i_unsafe_lock);
2490 list_add_tail(&req->r_unsafe_dir_item,
2491 &ci->i_unsafe_dirops);
2492 spin_unlock(&ci->i_unsafe_lock);
2496 dout("handle_reply tid %lld result %d\n", tid, result);
2497 rinfo = &req->r_reply_info;
2498 err = parse_reply_info(msg, rinfo, session->s_con.peer_features);
2499 mutex_unlock(&mdsc->mutex);
2501 mutex_lock(&session->s_mutex);
2503 pr_err("mdsc_handle_reply got corrupt reply mds%d(tid:%lld)\n", mds, tid);
2510 if (rinfo->snapblob_len) {
2511 down_write(&mdsc->snap_rwsem);
2512 ceph_update_snap_trace(mdsc, rinfo->snapblob,
2513 rinfo->snapblob + rinfo->snapblob_len,
2514 le32_to_cpu(head->op) == CEPH_MDS_OP_RMSNAP,
2516 downgrade_write(&mdsc->snap_rwsem);
2518 down_read(&mdsc->snap_rwsem);
2521 /* insert trace into our cache */
2522 mutex_lock(&req->r_fill_mutex);
2523 current->journal_info = req;
2524 err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
2526 if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
2527 req->r_op == CEPH_MDS_OP_LSSNAP))
2528 ceph_readdir_prepopulate(req, req->r_session);
2529 ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
2531 current->journal_info = NULL;
2532 mutex_unlock(&req->r_fill_mutex);
2534 up_read(&mdsc->snap_rwsem);
2536 ceph_put_snap_realm(mdsc, realm);
2538 if (err == 0 && req->r_got_unsafe && req->r_target_inode) {
2539 struct ceph_inode_info *ci = ceph_inode(req->r_target_inode);
2540 spin_lock(&ci->i_unsafe_lock);
2541 list_add_tail(&req->r_unsafe_target_item, &ci->i_unsafe_iops);
2542 spin_unlock(&ci->i_unsafe_lock);
2545 mutex_lock(&mdsc->mutex);
2546 if (!req->r_aborted) {
2550 req->r_reply = ceph_msg_get(msg);
2551 req->r_got_result = true;
2554 dout("reply arrived after request %lld was aborted\n", tid);
2556 mutex_unlock(&mdsc->mutex);
2558 mutex_unlock(&session->s_mutex);
2560 /* kick calling process */
2561 complete_request(mdsc, req);
2563 ceph_mdsc_put_request(req);
2570 * handle mds notification that our request has been forwarded.
2572 static void handle_forward(struct ceph_mds_client *mdsc,
2573 struct ceph_mds_session *session,
2574 struct ceph_msg *msg)
2576 struct ceph_mds_request *req;
2577 u64 tid = le64_to_cpu(msg->hdr.tid);
2581 void *p = msg->front.iov_base;
2582 void *end = p + msg->front.iov_len;
2584 ceph_decode_need(&p, end, 2*sizeof(u32), bad);
2585 next_mds = ceph_decode_32(&p);
2586 fwd_seq = ceph_decode_32(&p);
2588 mutex_lock(&mdsc->mutex);
2589 req = lookup_get_request(mdsc, tid);
2591 dout("forward tid %llu to mds%d - req dne\n", tid, next_mds);
2592 goto out; /* dup reply? */
2595 if (req->r_aborted) {
2596 dout("forward tid %llu aborted, unregistering\n", tid);
2597 __unregister_request(mdsc, req);
2598 } else if (fwd_seq <= req->r_num_fwd) {
2599 dout("forward tid %llu to mds%d - old seq %d <= %d\n",
2600 tid, next_mds, req->r_num_fwd, fwd_seq);
2602 /* resend. forward race not possible; mds would drop */
2603 dout("forward tid %llu to mds%d (we resend)\n", tid, next_mds);
2605 BUG_ON(req->r_got_result);
2606 req->r_attempts = 0;
2607 req->r_num_fwd = fwd_seq;
2608 req->r_resend_mds = next_mds;
2609 put_request_session(req);
2610 __do_request(mdsc, req);
2612 ceph_mdsc_put_request(req);
2614 mutex_unlock(&mdsc->mutex);
2618 pr_err("mdsc_handle_forward decode error err=%d\n", err);
2622 * handle a mds session control message
2624 static void handle_session(struct ceph_mds_session *session,
2625 struct ceph_msg *msg)
2627 struct ceph_mds_client *mdsc = session->s_mdsc;
2630 int mds = session->s_mds;
2631 struct ceph_mds_session_head *h = msg->front.iov_base;
2635 if (msg->front.iov_len != sizeof(*h))
2637 op = le32_to_cpu(h->op);
2638 seq = le64_to_cpu(h->seq);
2640 mutex_lock(&mdsc->mutex);
2641 if (op == CEPH_SESSION_CLOSE)
2642 __unregister_session(mdsc, session);
2643 /* FIXME: this ttl calculation is generous */
2644 session->s_ttl = jiffies + HZ*mdsc->mdsmap->m_session_autoclose;
2645 mutex_unlock(&mdsc->mutex);
2647 mutex_lock(&session->s_mutex);
2649 dout("handle_session mds%d %s %p state %s seq %llu\n",
2650 mds, ceph_session_op_name(op), session,
2651 ceph_session_state_name(session->s_state), seq);
2653 if (session->s_state == CEPH_MDS_SESSION_HUNG) {
2654 session->s_state = CEPH_MDS_SESSION_OPEN;
2655 pr_info("mds%d came back\n", session->s_mds);
2659 case CEPH_SESSION_OPEN:
2660 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2661 pr_info("mds%d reconnect success\n", session->s_mds);
2662 session->s_state = CEPH_MDS_SESSION_OPEN;
2663 renewed_caps(mdsc, session, 0);
2666 __close_session(mdsc, session);
2669 case CEPH_SESSION_RENEWCAPS:
2670 if (session->s_renew_seq == seq)
2671 renewed_caps(mdsc, session, 1);
2674 case CEPH_SESSION_CLOSE:
2675 if (session->s_state == CEPH_MDS_SESSION_RECONNECTING)
2676 pr_info("mds%d reconnect denied\n", session->s_mds);
2677 cleanup_session_requests(mdsc, session);
2678 remove_session_caps(session);
2679 wake = 2; /* for good measure */
2680 wake_up_all(&mdsc->session_close_wq);
2683 case CEPH_SESSION_STALE:
2684 pr_info("mds%d caps went stale, renewing\n",
2686 spin_lock(&session->s_gen_ttl_lock);
2687 session->s_cap_gen++;
2688 session->s_cap_ttl = jiffies - 1;
2689 spin_unlock(&session->s_gen_ttl_lock);
2690 send_renew_caps(mdsc, session);
2693 case CEPH_SESSION_RECALL_STATE:
2694 trim_caps(mdsc, session, le32_to_cpu(h->max_caps));
2697 case CEPH_SESSION_FLUSHMSG:
2698 send_flushmsg_ack(mdsc, session, seq);
2701 case CEPH_SESSION_FORCE_RO:
2702 dout("force_session_readonly %p\n", session);
2703 spin_lock(&session->s_cap_lock);
2704 session->s_readonly = true;
2705 spin_unlock(&session->s_cap_lock);
2706 wake_up_session_caps(session, 0);
2709 case CEPH_SESSION_REJECT:
2710 WARN_ON(session->s_state != CEPH_MDS_SESSION_OPENING);
2711 pr_info("mds%d rejected session\n", session->s_mds);
2712 session->s_state = CEPH_MDS_SESSION_REJECTED;
2713 cleanup_session_requests(mdsc, session);
2714 remove_session_caps(session);
2715 wake = 2; /* for good measure */
2719 pr_err("mdsc_handle_session bad op %d mds%d\n", op, mds);
2723 mutex_unlock(&session->s_mutex);
2725 mutex_lock(&mdsc->mutex);
2726 __wake_requests(mdsc, &session->s_waiting);
2728 kick_requests(mdsc, mds);
2729 mutex_unlock(&mdsc->mutex);
2734 pr_err("mdsc_handle_session corrupt message mds%d len %d\n", mds,
2735 (int)msg->front.iov_len);
2742 * called under session->mutex.
2744 static void replay_unsafe_requests(struct ceph_mds_client *mdsc,
2745 struct ceph_mds_session *session)
2747 struct ceph_mds_request *req, *nreq;
2751 dout("replay_unsafe_requests mds%d\n", session->s_mds);
2753 mutex_lock(&mdsc->mutex);
2754 list_for_each_entry_safe(req, nreq, &session->s_unsafe, r_unsafe_item) {
2755 err = __prepare_send_request(mdsc, req, session->s_mds, true);
2757 ceph_msg_get(req->r_request);
2758 ceph_con_send(&session->s_con, req->r_request);
2763 * also re-send old requests when MDS enters reconnect stage. So that MDS
2764 * can process completed request in clientreplay stage.
2766 p = rb_first(&mdsc->request_tree);
2768 req = rb_entry(p, struct ceph_mds_request, r_node);
2770 if (req->r_got_unsafe)
2772 if (req->r_attempts == 0)
2773 continue; /* only old requests */
2774 if (req->r_session &&
2775 req->r_session->s_mds == session->s_mds) {
2776 err = __prepare_send_request(mdsc, req,
2777 session->s_mds, true);
2779 ceph_msg_get(req->r_request);
2780 ceph_con_send(&session->s_con, req->r_request);
2784 mutex_unlock(&mdsc->mutex);
2788 * Encode information about a cap for a reconnect with the MDS.
2790 static int encode_caps_cb(struct inode *inode, struct ceph_cap *cap,
2794 struct ceph_mds_cap_reconnect v2;
2795 struct ceph_mds_cap_reconnect_v1 v1;
2797 struct ceph_inode_info *ci;
2798 struct ceph_reconnect_state *recon_state = arg;
2799 struct ceph_pagelist *pagelist = recon_state->pagelist;
2804 struct dentry *dentry;
2808 dout(" adding %p ino %llx.%llx cap %p %lld %s\n",
2809 inode, ceph_vinop(inode), cap, cap->cap_id,
2810 ceph_cap_string(cap->issued));
2811 err = ceph_pagelist_encode_64(pagelist, ceph_ino(inode));
2815 dentry = d_find_alias(inode);
2817 path = ceph_mdsc_build_path(dentry, &pathlen, &pathbase, 0);
2819 err = PTR_ERR(path);
2828 spin_lock(&ci->i_ceph_lock);
2829 cap->seq = 0; /* reset cap seq */
2830 cap->issue_seq = 0; /* and issue_seq */
2831 cap->mseq = 0; /* and migrate_seq */
2832 cap->cap_gen = cap->session->s_cap_gen;
2834 if (recon_state->msg_version >= 2) {
2835 rec.v2.cap_id = cpu_to_le64(cap->cap_id);
2836 rec.v2.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2837 rec.v2.issued = cpu_to_le32(cap->issued);
2838 rec.v2.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2839 rec.v2.pathbase = cpu_to_le64(pathbase);
2840 rec.v2.flock_len = 0;
2842 rec.v1.cap_id = cpu_to_le64(cap->cap_id);
2843 rec.v1.wanted = cpu_to_le32(__ceph_caps_wanted(ci));
2844 rec.v1.issued = cpu_to_le32(cap->issued);
2845 rec.v1.size = cpu_to_le64(inode->i_size);
2846 ceph_encode_timespec(&rec.v1.mtime, &inode->i_mtime);
2847 ceph_encode_timespec(&rec.v1.atime, &inode->i_atime);
2848 rec.v1.snaprealm = cpu_to_le64(ci->i_snap_realm->ino);
2849 rec.v1.pathbase = cpu_to_le64(pathbase);
2852 if (list_empty(&ci->i_cap_snaps)) {
2855 struct ceph_cap_snap *capsnap =
2856 list_first_entry(&ci->i_cap_snaps,
2857 struct ceph_cap_snap, ci_item);
2858 snap_follows = capsnap->follows;
2860 spin_unlock(&ci->i_ceph_lock);
2862 if (recon_state->msg_version >= 2) {
2863 int num_fcntl_locks, num_flock_locks;
2864 struct ceph_filelock *flocks;
2865 size_t struct_len, total_len = 0;
2869 ceph_count_locks(inode, &num_fcntl_locks, &num_flock_locks);
2870 flocks = kmalloc((num_fcntl_locks+num_flock_locks) *
2871 sizeof(struct ceph_filelock), GFP_NOFS);
2876 err = ceph_encode_locks_to_buffer(inode, flocks,
2886 if (recon_state->msg_version >= 3) {
2887 /* version, compat_version and struct_len */
2888 total_len = 2 * sizeof(u8) + sizeof(u32);
2892 * number of encoded locks is stable, so copy to pagelist
2894 struct_len = 2 * sizeof(u32) +
2895 (num_fcntl_locks + num_flock_locks) *
2896 sizeof(struct ceph_filelock);
2897 rec.v2.flock_len = cpu_to_le32(struct_len);
2899 struct_len += sizeof(rec.v2);
2900 struct_len += sizeof(u32) + pathlen;
2903 struct_len += sizeof(u64); /* snap_follows */
2905 total_len += struct_len;
2906 err = ceph_pagelist_reserve(pagelist, total_len);
2909 if (recon_state->msg_version >= 3) {
2910 ceph_pagelist_encode_8(pagelist, struct_v);
2911 ceph_pagelist_encode_8(pagelist, 1);
2912 ceph_pagelist_encode_32(pagelist, struct_len);
2914 ceph_pagelist_encode_string(pagelist, path, pathlen);
2915 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v2));
2916 ceph_locks_to_pagelist(flocks, pagelist,
2920 ceph_pagelist_encode_64(pagelist, snap_follows);
2924 size_t size = sizeof(u32) + pathlen + sizeof(rec.v1);
2925 err = ceph_pagelist_reserve(pagelist, size);
2927 ceph_pagelist_encode_string(pagelist, path, pathlen);
2928 ceph_pagelist_append(pagelist, &rec, sizeof(rec.v1));
2932 recon_state->nr_caps++;
2942 * If an MDS fails and recovers, clients need to reconnect in order to
2943 * reestablish shared state. This includes all caps issued through
2944 * this session _and_ the snap_realm hierarchy. Because it's not
2945 * clear which snap realms the mds cares about, we send everything we
2946 * know about.. that ensures we'll then get any new info the
2947 * recovering MDS might have.
2949 * This is a relatively heavyweight operation, but it's rare.
2951 * called with mdsc->mutex held.
2953 static void send_mds_reconnect(struct ceph_mds_client *mdsc,
2954 struct ceph_mds_session *session)
2956 struct ceph_msg *reply;
2958 int mds = session->s_mds;
2961 struct ceph_pagelist *pagelist;
2962 struct ceph_reconnect_state recon_state;
2964 pr_info("mds%d reconnect start\n", mds);
2966 pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
2968 goto fail_nopagelist;
2969 ceph_pagelist_init(pagelist);
2971 reply = ceph_msg_new(CEPH_MSG_CLIENT_RECONNECT, 0, GFP_NOFS, false);
2975 mutex_lock(&session->s_mutex);
2976 session->s_state = CEPH_MDS_SESSION_RECONNECTING;
2979 dout("session %p state %s\n", session,
2980 ceph_session_state_name(session->s_state));
2982 spin_lock(&session->s_gen_ttl_lock);
2983 session->s_cap_gen++;
2984 spin_unlock(&session->s_gen_ttl_lock);
2986 spin_lock(&session->s_cap_lock);
2987 /* don't know if session is readonly */
2988 session->s_readonly = 0;
2990 * notify __ceph_remove_cap() that we are composing cap reconnect.
2991 * If a cap get released before being added to the cap reconnect,
2992 * __ceph_remove_cap() should skip queuing cap release.
2994 session->s_cap_reconnect = 1;
2995 /* drop old cap expires; we're about to reestablish that state */
2996 cleanup_cap_releases(mdsc, session);
2998 /* trim unused caps to reduce MDS's cache rejoin time */
2999 if (mdsc->fsc->sb->s_root)
3000 shrink_dcache_parent(mdsc->fsc->sb->s_root);
3002 ceph_con_close(&session->s_con);
3003 ceph_con_open(&session->s_con,
3004 CEPH_ENTITY_TYPE_MDS, mds,
3005 ceph_mdsmap_get_addr(mdsc->mdsmap, mds));
3007 /* replay unsafe requests */
3008 replay_unsafe_requests(mdsc, session);
3010 down_read(&mdsc->snap_rwsem);
3012 /* traverse this session's caps */
3013 s_nr_caps = session->s_nr_caps;
3014 err = ceph_pagelist_encode_32(pagelist, s_nr_caps);
3018 recon_state.nr_caps = 0;
3019 recon_state.pagelist = pagelist;
3020 if (session->s_con.peer_features & CEPH_FEATURE_MDSENC)
3021 recon_state.msg_version = 3;
3022 else if (session->s_con.peer_features & CEPH_FEATURE_FLOCK)
3023 recon_state.msg_version = 2;
3025 recon_state.msg_version = 1;
3026 err = iterate_session_caps(session, encode_caps_cb, &recon_state);
3030 spin_lock(&session->s_cap_lock);
3031 session->s_cap_reconnect = 0;
3032 spin_unlock(&session->s_cap_lock);
3035 * snaprealms. we provide mds with the ino, seq (version), and
3036 * parent for all of our realms. If the mds has any newer info,
3039 for (p = rb_first(&mdsc->snap_realms); p; p = rb_next(p)) {
3040 struct ceph_snap_realm *realm =
3041 rb_entry(p, struct ceph_snap_realm, node);
3042 struct ceph_mds_snaprealm_reconnect sr_rec;
3044 dout(" adding snap realm %llx seq %lld parent %llx\n",
3045 realm->ino, realm->seq, realm->parent_ino);
3046 sr_rec.ino = cpu_to_le64(realm->ino);
3047 sr_rec.seq = cpu_to_le64(realm->seq);
3048 sr_rec.parent = cpu_to_le64(realm->parent_ino);
3049 err = ceph_pagelist_append(pagelist, &sr_rec, sizeof(sr_rec));
3054 reply->hdr.version = cpu_to_le16(recon_state.msg_version);
3056 /* raced with cap release? */
3057 if (s_nr_caps != recon_state.nr_caps) {
3058 struct page *page = list_first_entry(&pagelist->head,
3060 __le32 *addr = kmap_atomic(page);
3061 *addr = cpu_to_le32(recon_state.nr_caps);
3062 kunmap_atomic(addr);
3065 reply->hdr.data_len = cpu_to_le32(pagelist->length);
3066 ceph_msg_data_add_pagelist(reply, pagelist);
3068 ceph_early_kick_flushing_caps(mdsc, session);
3070 ceph_con_send(&session->s_con, reply);
3072 mutex_unlock(&session->s_mutex);
3074 mutex_lock(&mdsc->mutex);
3075 __wake_requests(mdsc, &session->s_waiting);
3076 mutex_unlock(&mdsc->mutex);
3078 up_read(&mdsc->snap_rwsem);
3082 ceph_msg_put(reply);
3083 up_read(&mdsc->snap_rwsem);
3084 mutex_unlock(&session->s_mutex);
3086 ceph_pagelist_release(pagelist);
3088 pr_err("error %d preparing reconnect for mds%d\n", err, mds);
3094 * compare old and new mdsmaps, kicking requests
3095 * and closing out old connections as necessary
3097 * called under mdsc->mutex.
3099 static void check_new_map(struct ceph_mds_client *mdsc,
3100 struct ceph_mdsmap *newmap,
3101 struct ceph_mdsmap *oldmap)
3104 int oldstate, newstate;
3105 struct ceph_mds_session *s;
3107 dout("check_new_map new %u old %u\n",
3108 newmap->m_epoch, oldmap->m_epoch);
3110 for (i = 0; i < oldmap->m_max_mds && i < mdsc->max_sessions; i++) {
3111 if (mdsc->sessions[i] == NULL)
3113 s = mdsc->sessions[i];
3114 oldstate = ceph_mdsmap_get_state(oldmap, i);
3115 newstate = ceph_mdsmap_get_state(newmap, i);
3117 dout("check_new_map mds%d state %s%s -> %s%s (session %s)\n",
3118 i, ceph_mds_state_name(oldstate),
3119 ceph_mdsmap_is_laggy(oldmap, i) ? " (laggy)" : "",
3120 ceph_mds_state_name(newstate),
3121 ceph_mdsmap_is_laggy(newmap, i) ? " (laggy)" : "",
3122 ceph_session_state_name(s->s_state));
3124 if (i >= newmap->m_max_mds ||
3125 memcmp(ceph_mdsmap_get_addr(oldmap, i),
3126 ceph_mdsmap_get_addr(newmap, i),
3127 sizeof(struct ceph_entity_addr))) {
3128 if (s->s_state == CEPH_MDS_SESSION_OPENING) {
3129 /* the session never opened, just close it
3131 __wake_requests(mdsc, &s->s_waiting);
3132 __unregister_session(mdsc, s);
3135 mutex_unlock(&mdsc->mutex);
3136 mutex_lock(&s->s_mutex);
3137 mutex_lock(&mdsc->mutex);
3138 ceph_con_close(&s->s_con);
3139 mutex_unlock(&s->s_mutex);
3140 s->s_state = CEPH_MDS_SESSION_RESTARTING;
3142 } else if (oldstate == newstate) {
3143 continue; /* nothing new with this mds */
3149 if (s->s_state == CEPH_MDS_SESSION_RESTARTING &&
3150 newstate >= CEPH_MDS_STATE_RECONNECT) {
3151 mutex_unlock(&mdsc->mutex);
3152 send_mds_reconnect(mdsc, s);
3153 mutex_lock(&mdsc->mutex);
3157 * kick request on any mds that has gone active.
3159 if (oldstate < CEPH_MDS_STATE_ACTIVE &&
3160 newstate >= CEPH_MDS_STATE_ACTIVE) {
3161 if (oldstate != CEPH_MDS_STATE_CREATING &&
3162 oldstate != CEPH_MDS_STATE_STARTING)
3163 pr_info("mds%d recovery completed\n", s->s_mds);
3164 kick_requests(mdsc, i);
3165 ceph_kick_flushing_caps(mdsc, s);
3166 wake_up_session_caps(s, 1);
3170 for (i = 0; i < newmap->m_max_mds && i < mdsc->max_sessions; i++) {
3171 s = mdsc->sessions[i];
3174 if (!ceph_mdsmap_is_laggy(newmap, i))
3176 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3177 s->s_state == CEPH_MDS_SESSION_HUNG ||
3178 s->s_state == CEPH_MDS_SESSION_CLOSING) {
3179 dout(" connecting to export targets of laggy mds%d\n",
3181 __open_export_target_sessions(mdsc, s);
3193 * caller must hold session s_mutex, dentry->d_lock
3195 void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry)
3197 struct ceph_dentry_info *di = ceph_dentry(dentry);
3199 ceph_put_mds_session(di->lease_session);
3200 di->lease_session = NULL;
3203 static void handle_lease(struct ceph_mds_client *mdsc,
3204 struct ceph_mds_session *session,
3205 struct ceph_msg *msg)
3207 struct super_block *sb = mdsc->fsc->sb;
3208 struct inode *inode;
3209 struct dentry *parent, *dentry;
3210 struct ceph_dentry_info *di;
3211 int mds = session->s_mds;
3212 struct ceph_mds_lease *h = msg->front.iov_base;
3214 struct ceph_vino vino;
3218 dout("handle_lease from mds%d\n", mds);
3221 if (msg->front.iov_len < sizeof(*h) + sizeof(u32))
3223 vino.ino = le64_to_cpu(h->ino);
3224 vino.snap = CEPH_NOSNAP;
3225 seq = le32_to_cpu(h->seq);
3226 dname.name = (void *)h + sizeof(*h) + sizeof(u32);
3227 dname.len = msg->front.iov_len - sizeof(*h) - sizeof(u32);
3228 if (dname.len != get_unaligned_le32(h+1))
3232 inode = ceph_find_inode(sb, vino);
3233 dout("handle_lease %s, ino %llx %p %.*s\n",
3234 ceph_lease_op_name(h->action), vino.ino, inode,
3235 dname.len, dname.name);
3237 mutex_lock(&session->s_mutex);
3240 if (inode == NULL) {
3241 dout("handle_lease no inode %llx\n", vino.ino);
3246 parent = d_find_alias(inode);
3248 dout("no parent dentry on inode %p\n", inode);
3250 goto release; /* hrm... */
3252 dname.hash = full_name_hash(parent, dname.name, dname.len);
3253 dentry = d_lookup(parent, &dname);
3258 spin_lock(&dentry->d_lock);
3259 di = ceph_dentry(dentry);
3260 switch (h->action) {
3261 case CEPH_MDS_LEASE_REVOKE:
3262 if (di->lease_session == session) {
3263 if (ceph_seq_cmp(di->lease_seq, seq) > 0)
3264 h->seq = cpu_to_le32(di->lease_seq);
3265 __ceph_mdsc_drop_dentry_lease(dentry);
3270 case CEPH_MDS_LEASE_RENEW:
3271 if (di->lease_session == session &&
3272 di->lease_gen == session->s_cap_gen &&
3273 di->lease_renew_from &&
3274 di->lease_renew_after == 0) {
3275 unsigned long duration =
3276 msecs_to_jiffies(le32_to_cpu(h->duration_ms));
3278 di->lease_seq = seq;
3279 di->time = di->lease_renew_from + duration;
3280 di->lease_renew_after = di->lease_renew_from +
3282 di->lease_renew_from = 0;
3286 spin_unlock(&dentry->d_lock);
3293 /* let's just reuse the same message */
3294 h->action = CEPH_MDS_LEASE_REVOKE_ACK;
3296 ceph_con_send(&session->s_con, msg);
3300 mutex_unlock(&session->s_mutex);
3304 pr_err("corrupt lease message\n");
3308 void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
3309 struct inode *inode,
3310 struct dentry *dentry, char action,
3313 struct ceph_msg *msg;
3314 struct ceph_mds_lease *lease;
3315 int len = sizeof(*lease) + sizeof(u32);
3318 dout("lease_send_msg inode %p dentry %p %s to mds%d\n",
3319 inode, dentry, ceph_lease_op_name(action), session->s_mds);
3320 dnamelen = dentry->d_name.len;
3323 msg = ceph_msg_new(CEPH_MSG_CLIENT_LEASE, len, GFP_NOFS, false);
3326 lease = msg->front.iov_base;
3327 lease->action = action;
3328 lease->ino = cpu_to_le64(ceph_vino(inode).ino);
3329 lease->first = lease->last = cpu_to_le64(ceph_vino(inode).snap);
3330 lease->seq = cpu_to_le32(seq);
3331 put_unaligned_le32(dnamelen, lease + 1);
3332 memcpy((void *)(lease + 1) + 4, dentry->d_name.name, dnamelen);
3335 * if this is a preemptive lease RELEASE, no need to
3336 * flush request stream, since the actual request will
3339 msg->more_to_follow = (action == CEPH_MDS_LEASE_RELEASE);
3341 ceph_con_send(&session->s_con, msg);
3345 * drop all leases (and dentry refs) in preparation for umount
3347 static void drop_leases(struct ceph_mds_client *mdsc)
3351 dout("drop_leases\n");
3352 mutex_lock(&mdsc->mutex);
3353 for (i = 0; i < mdsc->max_sessions; i++) {
3354 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3357 mutex_unlock(&mdsc->mutex);
3358 mutex_lock(&s->s_mutex);
3359 mutex_unlock(&s->s_mutex);
3360 ceph_put_mds_session(s);
3361 mutex_lock(&mdsc->mutex);
3363 mutex_unlock(&mdsc->mutex);
3369 * delayed work -- periodically trim expired leases, renew caps with mds
3371 static void schedule_delayed(struct ceph_mds_client *mdsc)
3374 unsigned hz = round_jiffies_relative(HZ * delay);
3375 schedule_delayed_work(&mdsc->delayed_work, hz);
3378 static void delayed_work(struct work_struct *work)
3381 struct ceph_mds_client *mdsc =
3382 container_of(work, struct ceph_mds_client, delayed_work.work);
3386 dout("mdsc delayed_work\n");
3387 ceph_check_delayed_caps(mdsc);
3392 mutex_lock(&mdsc->mutex);
3393 renew_interval = mdsc->mdsmap->m_session_timeout >> 2;
3394 renew_caps = time_after_eq(jiffies, HZ*renew_interval +
3395 mdsc->last_renew_caps);
3397 mdsc->last_renew_caps = jiffies;
3399 for (i = 0; i < mdsc->max_sessions; i++) {
3400 struct ceph_mds_session *s = __ceph_lookup_mds_session(mdsc, i);
3403 if (s->s_state == CEPH_MDS_SESSION_CLOSING) {
3404 dout("resending session close request for mds%d\n",
3406 request_close_session(mdsc, s);
3407 ceph_put_mds_session(s);
3410 if (s->s_ttl && time_after(jiffies, s->s_ttl)) {
3411 if (s->s_state == CEPH_MDS_SESSION_OPEN) {
3412 s->s_state = CEPH_MDS_SESSION_HUNG;
3413 pr_info("mds%d hung\n", s->s_mds);
3416 if (s->s_state == CEPH_MDS_SESSION_NEW ||
3417 s->s_state == CEPH_MDS_SESSION_RESTARTING ||
3418 s->s_state == CEPH_MDS_SESSION_REJECTED) {
3419 /* this mds is failed or recovering, just wait */
3420 ceph_put_mds_session(s);
3423 mutex_unlock(&mdsc->mutex);
3425 mutex_lock(&s->s_mutex);
3427 send_renew_caps(mdsc, s);
3429 ceph_con_keepalive(&s->s_con);
3430 if (s->s_state == CEPH_MDS_SESSION_OPEN ||
3431 s->s_state == CEPH_MDS_SESSION_HUNG)
3432 ceph_send_cap_releases(mdsc, s);
3433 mutex_unlock(&s->s_mutex);
3434 ceph_put_mds_session(s);
3436 mutex_lock(&mdsc->mutex);
3438 mutex_unlock(&mdsc->mutex);
3440 schedule_delayed(mdsc);
3443 int ceph_mdsc_init(struct ceph_fs_client *fsc)
3446 struct ceph_mds_client *mdsc;
3448 mdsc = kzalloc(sizeof(struct ceph_mds_client), GFP_NOFS);
3453 mutex_init(&mdsc->mutex);
3454 mdsc->mdsmap = kzalloc(sizeof(*mdsc->mdsmap), GFP_NOFS);
3455 if (mdsc->mdsmap == NULL) {
3460 init_completion(&mdsc->safe_umount_waiters);
3461 init_waitqueue_head(&mdsc->session_close_wq);
3462 INIT_LIST_HEAD(&mdsc->waiting_for_map);
3463 mdsc->sessions = NULL;
3464 atomic_set(&mdsc->num_sessions, 0);
3465 mdsc->max_sessions = 0;
3467 mdsc->last_snap_seq = 0;
3468 init_rwsem(&mdsc->snap_rwsem);
3469 mdsc->snap_realms = RB_ROOT;
3470 INIT_LIST_HEAD(&mdsc->snap_empty);
3471 spin_lock_init(&mdsc->snap_empty_lock);
3473 mdsc->oldest_tid = 0;
3474 mdsc->request_tree = RB_ROOT;
3475 INIT_DELAYED_WORK(&mdsc->delayed_work, delayed_work);
3476 mdsc->last_renew_caps = jiffies;
3477 INIT_LIST_HEAD(&mdsc->cap_delay_list);
3478 spin_lock_init(&mdsc->cap_delay_lock);
3479 INIT_LIST_HEAD(&mdsc->snap_flush_list);
3480 spin_lock_init(&mdsc->snap_flush_lock);
3481 mdsc->last_cap_flush_tid = 1;
3482 INIT_LIST_HEAD(&mdsc->cap_flush_list);
3483 INIT_LIST_HEAD(&mdsc->cap_dirty);
3484 INIT_LIST_HEAD(&mdsc->cap_dirty_migrating);
3485 mdsc->num_cap_flushing = 0;
3486 spin_lock_init(&mdsc->cap_dirty_lock);
3487 init_waitqueue_head(&mdsc->cap_flushing_wq);
3488 spin_lock_init(&mdsc->dentry_lru_lock);
3489 INIT_LIST_HEAD(&mdsc->dentry_lru);
3491 ceph_caps_init(mdsc);
3492 ceph_adjust_min_caps(mdsc, fsc->min_caps);
3494 init_rwsem(&mdsc->pool_perm_rwsem);
3495 mdsc->pool_perm_tree = RB_ROOT;
3501 * Wait for safe replies on open mds requests. If we time out, drop
3502 * all requests from the tree to avoid dangling dentry refs.
3504 static void wait_requests(struct ceph_mds_client *mdsc)
3506 struct ceph_options *opts = mdsc->fsc->client->options;
3507 struct ceph_mds_request *req;
3509 mutex_lock(&mdsc->mutex);
3510 if (__get_oldest_req(mdsc)) {
3511 mutex_unlock(&mdsc->mutex);
3513 dout("wait_requests waiting for requests\n");
3514 wait_for_completion_timeout(&mdsc->safe_umount_waiters,
3515 ceph_timeout_jiffies(opts->mount_timeout));
3517 /* tear down remaining requests */
3518 mutex_lock(&mdsc->mutex);
3519 while ((req = __get_oldest_req(mdsc))) {
3520 dout("wait_requests timed out on tid %llu\n",
3522 __unregister_request(mdsc, req);
3525 mutex_unlock(&mdsc->mutex);
3526 dout("wait_requests done\n");
3530 * called before mount is ro, and before dentries are torn down.
3531 * (hmm, does this still race with new lookups?)
3533 void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc)
3535 dout("pre_umount\n");
3539 ceph_flush_dirty_caps(mdsc);
3540 wait_requests(mdsc);
3543 * wait for reply handlers to drop their request refs and
3544 * their inode/dcache refs
3550 * wait for all write mds requests to flush.
3552 static void wait_unsafe_requests(struct ceph_mds_client *mdsc, u64 want_tid)
3554 struct ceph_mds_request *req = NULL, *nextreq;
3557 mutex_lock(&mdsc->mutex);
3558 dout("wait_unsafe_requests want %lld\n", want_tid);
3560 req = __get_oldest_req(mdsc);
3561 while (req && req->r_tid <= want_tid) {
3562 /* find next request */
3563 n = rb_next(&req->r_node);
3565 nextreq = rb_entry(n, struct ceph_mds_request, r_node);
3568 if (req->r_op != CEPH_MDS_OP_SETFILELOCK &&
3569 (req->r_op & CEPH_MDS_OP_WRITE)) {
3571 ceph_mdsc_get_request(req);
3573 ceph_mdsc_get_request(nextreq);
3574 mutex_unlock(&mdsc->mutex);
3575 dout("wait_unsafe_requests wait on %llu (want %llu)\n",
3576 req->r_tid, want_tid);
3577 wait_for_completion(&req->r_safe_completion);
3578 mutex_lock(&mdsc->mutex);
3579 ceph_mdsc_put_request(req);
3581 break; /* next dne before, so we're done! */
3582 if (RB_EMPTY_NODE(&nextreq->r_node)) {
3583 /* next request was removed from tree */
3584 ceph_mdsc_put_request(nextreq);
3587 ceph_mdsc_put_request(nextreq); /* won't go away */
3591 mutex_unlock(&mdsc->mutex);
3592 dout("wait_unsafe_requests done\n");
3595 void ceph_mdsc_sync(struct ceph_mds_client *mdsc)
3597 u64 want_tid, want_flush;
3599 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3603 mutex_lock(&mdsc->mutex);
3604 want_tid = mdsc->last_tid;
3605 mutex_unlock(&mdsc->mutex);
3607 ceph_flush_dirty_caps(mdsc);
3608 spin_lock(&mdsc->cap_dirty_lock);
3609 want_flush = mdsc->last_cap_flush_tid;
3610 if (!list_empty(&mdsc->cap_flush_list)) {
3611 struct ceph_cap_flush *cf =
3612 list_last_entry(&mdsc->cap_flush_list,
3613 struct ceph_cap_flush, g_list);
3616 spin_unlock(&mdsc->cap_dirty_lock);
3618 dout("sync want tid %lld flush_seq %lld\n",
3619 want_tid, want_flush);
3621 wait_unsafe_requests(mdsc, want_tid);
3622 wait_caps_flush(mdsc, want_flush);
3626 * true if all sessions are closed, or we force unmount
3628 static bool done_closing_sessions(struct ceph_mds_client *mdsc, int skipped)
3630 if (ACCESS_ONCE(mdsc->fsc->mount_state) == CEPH_MOUNT_SHUTDOWN)
3632 return atomic_read(&mdsc->num_sessions) <= skipped;
3636 * called after sb is ro.
3638 void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc)
3640 struct ceph_options *opts = mdsc->fsc->client->options;
3641 struct ceph_mds_session *session;
3645 dout("close_sessions\n");
3647 /* close sessions */
3648 mutex_lock(&mdsc->mutex);
3649 for (i = 0; i < mdsc->max_sessions; i++) {
3650 session = __ceph_lookup_mds_session(mdsc, i);
3653 mutex_unlock(&mdsc->mutex);
3654 mutex_lock(&session->s_mutex);
3655 if (__close_session(mdsc, session) <= 0)
3657 mutex_unlock(&session->s_mutex);
3658 ceph_put_mds_session(session);
3659 mutex_lock(&mdsc->mutex);
3661 mutex_unlock(&mdsc->mutex);
3663 dout("waiting for sessions to close\n");
3664 wait_event_timeout(mdsc->session_close_wq,
3665 done_closing_sessions(mdsc, skipped),
3666 ceph_timeout_jiffies(opts->mount_timeout));
3668 /* tear down remaining sessions */
3669 mutex_lock(&mdsc->mutex);
3670 for (i = 0; i < mdsc->max_sessions; i++) {
3671 if (mdsc->sessions[i]) {
3672 session = get_session(mdsc->sessions[i]);
3673 __unregister_session(mdsc, session);
3674 mutex_unlock(&mdsc->mutex);
3675 mutex_lock(&session->s_mutex);
3676 remove_session_caps(session);
3677 mutex_unlock(&session->s_mutex);
3678 ceph_put_mds_session(session);
3679 mutex_lock(&mdsc->mutex);
3682 WARN_ON(!list_empty(&mdsc->cap_delay_list));
3683 mutex_unlock(&mdsc->mutex);
3685 ceph_cleanup_empty_realms(mdsc);
3687 cancel_delayed_work_sync(&mdsc->delayed_work); /* cancel timer */
3692 void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc)
3694 struct ceph_mds_session *session;
3697 dout("force umount\n");
3699 mutex_lock(&mdsc->mutex);
3700 for (mds = 0; mds < mdsc->max_sessions; mds++) {
3701 session = __ceph_lookup_mds_session(mdsc, mds);
3704 mutex_unlock(&mdsc->mutex);
3705 mutex_lock(&session->s_mutex);
3706 __close_session(mdsc, session);
3707 if (session->s_state == CEPH_MDS_SESSION_CLOSING) {
3708 cleanup_session_requests(mdsc, session);
3709 remove_session_caps(session);
3711 mutex_unlock(&session->s_mutex);
3712 ceph_put_mds_session(session);
3713 mutex_lock(&mdsc->mutex);
3714 kick_requests(mdsc, mds);
3716 __wake_requests(mdsc, &mdsc->waiting_for_map);
3717 mutex_unlock(&mdsc->mutex);
3720 static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
3724 * Make sure the delayed work stopped before releasing
3727 * Because the cancel_delayed_work_sync() will only
3728 * guarantee that the work finishes executing. But the
3729 * delayed work will re-arm itself again after that.
3731 flush_delayed_work(&mdsc->delayed_work);
3734 ceph_mdsmap_destroy(mdsc->mdsmap);
3735 kfree(mdsc->sessions);
3736 ceph_caps_finalize(mdsc);
3737 ceph_pool_perm_destroy(mdsc);
3740 void ceph_mdsc_destroy(struct ceph_fs_client *fsc)
3742 struct ceph_mds_client *mdsc = fsc->mdsc;
3744 dout("mdsc_destroy %p\n", mdsc);
3745 ceph_mdsc_stop(mdsc);
3747 /* flush out any connection work with references to us */
3752 dout("mdsc_destroy %p done\n", mdsc);
3755 void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3757 struct ceph_fs_client *fsc = mdsc->fsc;
3758 const char *mds_namespace = fsc->mount_options->mds_namespace;
3759 void *p = msg->front.iov_base;
3760 void *end = p + msg->front.iov_len;
3764 u32 mount_fscid = (u32)-1;
3765 u8 struct_v, struct_cv;
3768 ceph_decode_need(&p, end, sizeof(u32), bad);
3769 epoch = ceph_decode_32(&p);
3771 dout("handle_fsmap epoch %u\n", epoch);
3773 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3774 struct_v = ceph_decode_8(&p);
3775 struct_cv = ceph_decode_8(&p);
3776 map_len = ceph_decode_32(&p);
3778 ceph_decode_need(&p, end, sizeof(u32) * 3, bad);
3779 p += sizeof(u32) * 2; /* skip epoch and legacy_client_fscid */
3781 num_fs = ceph_decode_32(&p);
3782 while (num_fs-- > 0) {
3783 void *info_p, *info_end;
3788 ceph_decode_need(&p, end, 2 + sizeof(u32), bad);
3789 info_v = ceph_decode_8(&p);
3790 info_cv = ceph_decode_8(&p);
3791 info_len = ceph_decode_32(&p);
3792 ceph_decode_need(&p, end, info_len, bad);
3794 info_end = p + info_len;
3797 ceph_decode_need(&info_p, info_end, sizeof(u32) * 2, bad);
3798 fscid = ceph_decode_32(&info_p);
3799 namelen = ceph_decode_32(&info_p);
3800 ceph_decode_need(&info_p, info_end, namelen, bad);
3802 if (mds_namespace &&
3803 strlen(mds_namespace) == namelen &&
3804 !strncmp(mds_namespace, (char *)info_p, namelen)) {
3805 mount_fscid = fscid;
3810 ceph_monc_got_map(&fsc->client->monc, CEPH_SUB_FSMAP, epoch);
3811 if (mount_fscid != (u32)-1) {
3812 fsc->client->monc.fs_cluster_id = mount_fscid;
3813 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP,
3815 ceph_monc_renew_subs(&fsc->client->monc);
3822 pr_err("error decoding fsmap\n");
3824 mutex_lock(&mdsc->mutex);
3825 mdsc->mdsmap_err = -ENOENT;
3826 __wake_requests(mdsc, &mdsc->waiting_for_map);
3827 mutex_unlock(&mdsc->mutex);
3832 * handle mds map update.
3834 void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, struct ceph_msg *msg)
3838 void *p = msg->front.iov_base;
3839 void *end = p + msg->front.iov_len;
3840 struct ceph_mdsmap *newmap, *oldmap;
3841 struct ceph_fsid fsid;
3844 ceph_decode_need(&p, end, sizeof(fsid)+2*sizeof(u32), bad);
3845 ceph_decode_copy(&p, &fsid, sizeof(fsid));
3846 if (ceph_check_fsid(mdsc->fsc->client, &fsid) < 0)
3848 epoch = ceph_decode_32(&p);
3849 maplen = ceph_decode_32(&p);
3850 dout("handle_map epoch %u len %d\n", epoch, (int)maplen);
3852 /* do we need it? */
3853 mutex_lock(&mdsc->mutex);
3854 if (mdsc->mdsmap && epoch <= mdsc->mdsmap->m_epoch) {
3855 dout("handle_map epoch %u <= our %u\n",
3856 epoch, mdsc->mdsmap->m_epoch);
3857 mutex_unlock(&mdsc->mutex);
3861 newmap = ceph_mdsmap_decode(&p, end);
3862 if (IS_ERR(newmap)) {
3863 err = PTR_ERR(newmap);
3867 /* swap into place */
3869 oldmap = mdsc->mdsmap;
3870 mdsc->mdsmap = newmap;
3871 check_new_map(mdsc, newmap, oldmap);
3872 ceph_mdsmap_destroy(oldmap);
3874 mdsc->mdsmap = newmap; /* first mds map */
3876 mdsc->fsc->sb->s_maxbytes = mdsc->mdsmap->m_max_file_size;
3878 __wake_requests(mdsc, &mdsc->waiting_for_map);
3879 ceph_monc_got_map(&mdsc->fsc->client->monc, CEPH_SUB_MDSMAP,
3880 mdsc->mdsmap->m_epoch);
3882 mutex_unlock(&mdsc->mutex);
3883 schedule_delayed(mdsc);
3887 mutex_unlock(&mdsc->mutex);
3889 pr_err("error decoding mdsmap %d\n", err);
3893 static struct ceph_connection *con_get(struct ceph_connection *con)
3895 struct ceph_mds_session *s = con->private;
3897 if (get_session(s)) {
3898 dout("mdsc con_get %p ok (%d)\n", s, atomic_read(&s->s_ref));
3901 dout("mdsc con_get %p FAIL\n", s);
3905 static void con_put(struct ceph_connection *con)
3907 struct ceph_mds_session *s = con->private;
3909 dout("mdsc con_put %p (%d)\n", s, atomic_read(&s->s_ref) - 1);
3910 ceph_put_mds_session(s);
3914 * if the client is unresponsive for long enough, the mds will kill
3915 * the session entirely.
3917 static void peer_reset(struct ceph_connection *con)
3919 struct ceph_mds_session *s = con->private;
3920 struct ceph_mds_client *mdsc = s->s_mdsc;
3922 pr_warn("mds%d closed our session\n", s->s_mds);
3923 send_mds_reconnect(mdsc, s);
3926 static void dispatch(struct ceph_connection *con, struct ceph_msg *msg)
3928 struct ceph_mds_session *s = con->private;
3929 struct ceph_mds_client *mdsc = s->s_mdsc;
3930 int type = le16_to_cpu(msg->hdr.type);
3932 mutex_lock(&mdsc->mutex);
3933 if (__verify_registered_session(mdsc, s) < 0) {
3934 mutex_unlock(&mdsc->mutex);
3937 mutex_unlock(&mdsc->mutex);
3940 case CEPH_MSG_MDS_MAP:
3941 ceph_mdsc_handle_mdsmap(mdsc, msg);
3943 case CEPH_MSG_FS_MAP_USER:
3944 ceph_mdsc_handle_fsmap(mdsc, msg);
3946 case CEPH_MSG_CLIENT_SESSION:
3947 handle_session(s, msg);
3949 case CEPH_MSG_CLIENT_REPLY:
3950 handle_reply(s, msg);
3952 case CEPH_MSG_CLIENT_REQUEST_FORWARD:
3953 handle_forward(mdsc, s, msg);
3955 case CEPH_MSG_CLIENT_CAPS:
3956 ceph_handle_caps(s, msg);
3958 case CEPH_MSG_CLIENT_SNAP:
3959 ceph_handle_snap(mdsc, s, msg);
3961 case CEPH_MSG_CLIENT_LEASE:
3962 handle_lease(mdsc, s, msg);
3966 pr_err("received unknown message type %d %s\n", type,
3967 ceph_msg_type_name(type));
3978 * Note: returned pointer is the address of a structure that's
3979 * managed separately. Caller must *not* attempt to free it.
3981 static struct ceph_auth_handshake *get_authorizer(struct ceph_connection *con,
3982 int *proto, int force_new)
3984 struct ceph_mds_session *s = con->private;
3985 struct ceph_mds_client *mdsc = s->s_mdsc;
3986 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
3987 struct ceph_auth_handshake *auth = &s->s_auth;
3989 if (force_new && auth->authorizer) {
3990 ceph_auth_destroy_authorizer(auth->authorizer);
3991 auth->authorizer = NULL;
3993 if (!auth->authorizer) {
3994 int ret = ceph_auth_create_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
3997 return ERR_PTR(ret);
3999 int ret = ceph_auth_update_authorizer(ac, CEPH_ENTITY_TYPE_MDS,
4002 return ERR_PTR(ret);
4004 *proto = ac->protocol;
4009 static int add_authorizer_challenge(struct ceph_connection *con,
4010 void *challenge_buf, int challenge_buf_len)
4012 struct ceph_mds_session *s = con->private;
4013 struct ceph_mds_client *mdsc = s->s_mdsc;
4014 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4016 return ceph_auth_add_authorizer_challenge(ac, s->s_auth.authorizer,
4017 challenge_buf, challenge_buf_len);
4020 static int verify_authorizer_reply(struct ceph_connection *con)
4022 struct ceph_mds_session *s = con->private;
4023 struct ceph_mds_client *mdsc = s->s_mdsc;
4024 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4026 return ceph_auth_verify_authorizer_reply(ac, s->s_auth.authorizer);
4029 static int invalidate_authorizer(struct ceph_connection *con)
4031 struct ceph_mds_session *s = con->private;
4032 struct ceph_mds_client *mdsc = s->s_mdsc;
4033 struct ceph_auth_client *ac = mdsc->fsc->client->monc.auth;
4035 ceph_auth_invalidate_authorizer(ac, CEPH_ENTITY_TYPE_MDS);
4037 return ceph_monc_validate_auth(&mdsc->fsc->client->monc);
4040 static struct ceph_msg *mds_alloc_msg(struct ceph_connection *con,
4041 struct ceph_msg_header *hdr, int *skip)
4043 struct ceph_msg *msg;
4044 int type = (int) le16_to_cpu(hdr->type);
4045 int front_len = (int) le32_to_cpu(hdr->front_len);
4051 msg = ceph_msg_new(type, front_len, GFP_NOFS, false);
4053 pr_err("unable to allocate msg type %d len %d\n",
4061 static int mds_sign_message(struct ceph_msg *msg)
4063 struct ceph_mds_session *s = msg->con->private;
4064 struct ceph_auth_handshake *auth = &s->s_auth;
4066 return ceph_auth_sign_message(auth, msg);
4069 static int mds_check_message_signature(struct ceph_msg *msg)
4071 struct ceph_mds_session *s = msg->con->private;
4072 struct ceph_auth_handshake *auth = &s->s_auth;
4074 return ceph_auth_check_message_signature(auth, msg);
4077 static const struct ceph_connection_operations mds_con_ops = {
4080 .dispatch = dispatch,
4081 .get_authorizer = get_authorizer,
4082 .add_authorizer_challenge = add_authorizer_challenge,
4083 .verify_authorizer_reply = verify_authorizer_reply,
4084 .invalidate_authorizer = invalidate_authorizer,
4085 .peer_reset = peer_reset,
4086 .alloc_msg = mds_alloc_msg,
4087 .sign_message = mds_sign_message,
4088 .check_message_signature = mds_check_message_signature,