1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_MDS_CLIENT_H
3 #define _FS_CEPH_MDS_CLIENT_H
4
5 #include <linux/completion.h>
6 #include <linux/kref.h>
7 #include <linux/list.h>
8 #include <linux/mutex.h>
9 #include <linux/rbtree.h>
10 #include <linux/spinlock.h>
11 #include <linux/refcount.h>
12 #include <linux/utsname.h>
13 #include <linux/ktime.h>
14
15 #include <linux/ceph/types.h>
16 #include <linux/ceph/messenger.h>
17 #include <linux/ceph/auth.h>
18
19 #include "mdsmap.h"
20 #include "metric.h"
21 #include "super.h"
22
23 /* The first 8 bits are reserved for old ceph releases */
24 enum ceph_feature_type {
25 CEPHFS_FEATURE_MIMIC = 8,
26 CEPHFS_FEATURE_REPLY_ENCODING,
27 CEPHFS_FEATURE_RECLAIM_CLIENT,
28 CEPHFS_FEATURE_LAZY_CAP_WANTED,
29 CEPHFS_FEATURE_MULTI_RECONNECT,
30 CEPHFS_FEATURE_DELEG_INO,
31 CEPHFS_FEATURE_METRIC_COLLECT,
32 CEPHFS_FEATURE_ALTERNATE_NAME,
33 CEPHFS_FEATURE_NOTIFY_SESSION_STATE,
34 CEPHFS_FEATURE_OP_GETVXATTR,
35 CEPHFS_FEATURE_32BITS_RETRY_FWD,
36 CEPHFS_FEATURE_NEW_SNAPREALM_INFO,
37 CEPHFS_FEATURE_HAS_OWNER_UIDGID,
38 CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,
39
40 CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,
41 };
42
43 #define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
44 0, 1, 2, 3, 4, 5, 6, 7, \
45 CEPHFS_FEATURE_MIMIC, \
46 CEPHFS_FEATURE_REPLY_ENCODING, \
47 CEPHFS_FEATURE_LAZY_CAP_WANTED, \
48 CEPHFS_FEATURE_MULTI_RECONNECT, \
49 CEPHFS_FEATURE_DELEG_INO, \
50 CEPHFS_FEATURE_METRIC_COLLECT, \
51 CEPHFS_FEATURE_ALTERNATE_NAME, \
52 CEPHFS_FEATURE_NOTIFY_SESSION_STATE, \
53 CEPHFS_FEATURE_OP_GETVXATTR, \
54 CEPHFS_FEATURE_32BITS_RETRY_FWD, \
55 CEPHFS_FEATURE_HAS_OWNER_UIDGID, \
56 CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK, \
57 }
58
59 /*
60 * Some lock dependencies:
61 *
62 * session->s_mutex
63 * mdsc->mutex
64 *
65 * mdsc->snap_rwsem
66 *
67 * ci->i_ceph_lock
68 * mdsc->snap_flush_lock
69 * mdsc->cap_delay_lock
70 *
71 */
72
73 struct ceph_fs_client;
74 struct ceph_cap;
75
76 #define MDS_AUTH_UID_ANY -1
77
78 struct ceph_mds_cap_match {
79 s64 uid; /* default to MDS_AUTH_UID_ANY */
80 u32 num_gids;
81 u32 *gids; /* use these GIDs */
82 char *path; /* require path to be child of this
83 (may be "" or "/" for any) */
84 char *fs_name;
85 bool root_squash; /* default to false */
86 };
87
88 struct ceph_mds_cap_auth {
89 struct ceph_mds_cap_match match;
90 bool readable;
91 bool writeable;
92 };
93
94 /*
95 * parsed info about a single inode. pointers are into the encoded
96 * on-wire structures within the mds reply message payload.
97 */
98 struct ceph_mds_reply_info_in {
99 struct ceph_mds_reply_inode *in;
100 struct ceph_dir_layout dir_layout;
101 u32 symlink_len;
102 char *symlink;
103 u32 xattr_len;
104 char *xattr_data;
105 u64 inline_version;
106 u32 inline_len;
107 char *inline_data;
108 u32 pool_ns_len;
109 char *pool_ns_data;
110 u64 max_bytes;
111 u64 max_files;
112 s32 dir_pin;
113 struct ceph_timespec btime;
114 struct ceph_timespec snap_btime;
115 u8 *fscrypt_auth;
116 u8 *fscrypt_file;
117 u32 fscrypt_auth_len;
118 u32 fscrypt_file_len;
119 u64 rsnaps;
120 u64 change_attr;
121 };
122
123 struct ceph_mds_reply_dir_entry {
124 bool is_nokey;
125 char *name;
126 u32 name_len;
127 u32 raw_hash;
128 struct ceph_mds_reply_lease *lease;
129 struct ceph_mds_reply_info_in inode;
130 loff_t offset;
131 };
132
133 struct ceph_mds_reply_xattr {
134 char *xattr_value;
135 size_t xattr_value_len;
136 };
137
138 /*
139 * parsed info about an mds reply, including information about
140 * either: 1) the target inode and/or its parent directory and dentry,
141 * and directory contents (for readdir results), or
142 * 2) the file range lock info (for fcntl F_GETLK results).
143 */
144 struct ceph_mds_reply_info_parsed {
145 struct ceph_mds_reply_head *head;
146
147 /* trace */
148 struct ceph_mds_reply_info_in diri, targeti;
149 struct ceph_mds_reply_dirfrag *dirfrag;
150 char *dname;
151 u8 *altname;
152 u32 dname_len;
153 u32 altname_len;
154 struct ceph_mds_reply_lease *dlease;
155 struct ceph_mds_reply_xattr xattr_info;
156
157 /* extra */
158 union {
159 /* for fcntl F_GETLK results */
160 struct ceph_filelock *filelock_reply;
161
162 /* for readdir results */
163 struct {
164 struct ceph_mds_reply_dirfrag *dir_dir;
165 size_t dir_buf_size;
166 int dir_nr;
167 bool dir_end;
168 bool dir_complete;
169 bool hash_order;
170 bool offset_hash;
171 struct ceph_mds_reply_dir_entry *dir_entries;
172 };
173
174 /* for create results */
175 struct {
176 bool has_create_ino;
177 u64 ino;
178 };
179 };
180
181 /* encoded blob describing snapshot contexts for certain
182 operations (e.g., open) */
183 void *snapblob;
184 int snapblob_len;
185 };
186
187
188 /*
189 * cap releases are batched and sent to the MDS en masse.
190 *
191 * Account for per-message overhead of mds_cap_release header
192 * and __le32 for osd epoch barrier trailing field.
193 */
194 #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
195 sizeof(struct ceph_mds_cap_release)) / \
196 sizeof(struct ceph_mds_cap_item))
197
198
199 /*
200 * state associated with each MDS<->client session
201 */
202 enum {
203 CEPH_MDS_SESSION_NEW = 1,
204 CEPH_MDS_SESSION_OPENING = 2,
205 CEPH_MDS_SESSION_OPEN = 3,
206 CEPH_MDS_SESSION_HUNG = 4,
207 CEPH_MDS_SESSION_RESTARTING = 5,
208 CEPH_MDS_SESSION_RECONNECTING = 6,
209 CEPH_MDS_SESSION_CLOSING = 7,
210 CEPH_MDS_SESSION_CLOSED = 8,
211 CEPH_MDS_SESSION_REJECTED = 9,
212 };
213
214 struct ceph_mds_session {
215 struct ceph_mds_client *s_mdsc;
216 int s_mds;
217 int s_state;
218 unsigned long s_ttl; /* time until mds kills us */
219 unsigned long s_features;
220 u64 s_seq; /* incoming msg seq # */
221 struct mutex s_mutex; /* serialize session messages */
222
223 struct ceph_connection s_con;
224
225 struct ceph_auth_handshake s_auth;
226
227 atomic_t s_cap_gen; /* inc each time we get mds stale msg */
228 unsigned long s_cap_ttl; /* when session caps expire. protected by s_mutex */
229
230 /* protected by s_cap_lock */
231 spinlock_t s_cap_lock;
232 refcount_t s_ref;
233 struct list_head s_caps; /* all caps issued by this session */
234 struct ceph_cap *s_cap_iterator;
235 int s_nr_caps;
236 int s_num_cap_releases;
237 int s_cap_reconnect;
238 int s_readonly;
239 struct list_head s_cap_releases; /* waiting cap_release messages */
240 struct work_struct s_cap_release_work;
241
242 /* See ceph_inode_info->i_dirty_item. */
243 struct list_head s_cap_dirty; /* inodes w/ dirty caps */
244
245 /* See ceph_inode_info->i_flushing_item. */
246 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
247
248 unsigned long s_renew_requested; /* last time we sent a renew req */
249 u64 s_renew_seq;
250
251 struct list_head s_waiting; /* waiting requests */
252 struct list_head s_unsafe; /* unsafe requests */
253 struct xarray s_delegated_inos;
254 };
255
256 /*
257 * modes of choosing which MDS to send a request to
258 */
259 enum {
260 USE_ANY_MDS,
261 USE_RANDOM_MDS,
262 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
263 };
264
265 struct ceph_mds_request;
266 struct ceph_mds_client;
267
268 /*
269 * request completion callback
270 */
271 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
272 struct ceph_mds_request *req);
273 /*
274 * wait for request completion callback
275 */
276 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
277 struct ceph_mds_request *req);
278
279 /*
280 * an in-flight mds request
281 */
282 struct ceph_mds_request {
283 u64 r_tid; /* transaction id */
284 struct rb_node r_node;
285 struct ceph_mds_client *r_mdsc;
286
287 struct kref r_kref;
288 int r_op; /* mds op code */
289
290 /* operation on what? */
291 struct inode *r_inode; /* arg1 */
292 struct dentry *r_dentry; /* arg1 */
293 struct dentry *r_old_dentry; /* arg2: rename from or link from */
294 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
295 char *r_path1, *r_path2;
296 struct ceph_vino r_ino1, r_ino2;
297
298 struct inode *r_parent; /* parent dir inode */
299 struct inode *r_target_inode; /* resulting inode */
300 struct inode *r_new_inode; /* new inode (for creates) */
301
302 const struct qstr *r_dname; /* stable name (for ->d_revalidate) */
303
304 #define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
305 #define CEPH_MDS_R_ABORTED (2) /* call was aborted */
306 #define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
307 #define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
308 #define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
309 #define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
310 #define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
311 #define CEPH_MDS_R_ASYNC (8) /* async request */
312 #define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */
313 unsigned long r_req_flags;
314
315 struct mutex r_fill_mutex;
316
317 union ceph_mds_request_args r_args;
318
319 struct ceph_fscrypt_auth *r_fscrypt_auth;
320 u64 r_fscrypt_file;
321
322 u8 *r_altname; /* fscrypt binary crypttext for long filenames */
323 u32 r_altname_len; /* length of r_altname */
324
325 int r_fmode; /* file mode, if expecting cap */
326 int r_request_release_offset;
327 const struct cred *r_cred;
328 struct mnt_idmap *r_mnt_idmap;
329 struct timespec64 r_stamp;
330
331 /* for choosing which mds to send this request to */
332 int r_direct_mode;
333 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
334
335 /* data payload is used for xattr ops */
336 struct ceph_pagelist *r_pagelist;
337
338 /* what caps shall we drop? */
339 int r_inode_drop, r_inode_unless;
340 int r_dentry_drop, r_dentry_unless;
341 int r_old_dentry_drop, r_old_dentry_unless;
342 struct inode *r_old_inode;
343 int r_old_inode_drop, r_old_inode_unless;
344
345 struct ceph_msg *r_request; /* original request */
346 struct ceph_msg *r_reply;
347 struct ceph_mds_reply_info_parsed r_reply_info;
348 int r_err;
349 u32 r_readdir_offset;
350
351 struct page *r_locked_page;
352 int r_dir_caps;
353 int r_num_caps;
354
355 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
356 unsigned long r_started; /* start time to measure timeout against */
357 unsigned long r_start_latency; /* start time to measure latency */
358 unsigned long r_end_latency; /* finish time to measure latency */
359 unsigned long r_request_started; /* start time for mds request only,
360 used to measure lease durations */
361
362 /* link unsafe requests to parent directory, for fsync */
363 struct inode *r_unsafe_dir;
364 struct list_head r_unsafe_dir_item;
365
366 /* unsafe requests that modify the target inode */
367 struct list_head r_unsafe_target_item;
368
369 struct ceph_mds_session *r_session;
370
371 int r_attempts; /* resend attempts */
372 int r_num_fwd; /* number of forward attempts */
373 int r_resend_mds; /* mds to resend to next, if any*/
374 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
375 u64 r_deleg_ino;
376
377 struct list_head r_wait;
378 struct completion r_completion;
379 struct completion r_safe_completion;
380 ceph_mds_request_callback_t r_callback;
381 struct list_head r_unsafe_item; /* per-session unsafe list item */
382
383 long long r_dir_release_cnt;
384 long long r_dir_ordered_cnt;
385 int r_readdir_cache_idx;
386
387 int r_feature_needed;
388
389 struct ceph_cap_reservation r_caps_reservation;
390 };
391
392 struct ceph_pool_perm {
393 struct rb_node node;
394 int perm;
395 s64 pool;
396 size_t pool_ns_len;
397 char pool_ns[];
398 };
399
400 struct ceph_snapid_map {
401 struct rb_node node;
402 struct list_head lru;
403 atomic_t ref;
404 dev_t dev;
405 u64 snap;
406 unsigned long last_used;
407 };
408
409 /*
410 * node for list of quotarealm inodes that are not visible from the filesystem
411 * mountpoint, but required to handle, e.g. quotas.
412 */
413 struct ceph_quotarealm_inode {
414 struct rb_node node;
415 u64 ino;
416 unsigned long timeout; /* last time a lookup failed for this inode */
417 struct mutex mutex;
418 struct inode *inode;
419 };
420
421 #ifdef CONFIG_DEBUG_FS
422
423 struct cap_wait {
424 struct list_head list;
425 u64 ino;
426 pid_t tgid;
427 int need;
428 int want;
429 };
430
431 #endif
432
433 enum {
434 CEPH_MDSC_STOPPING_BEGIN = 1,
435 CEPH_MDSC_STOPPING_FLUSHING = 2,
436 CEPH_MDSC_STOPPING_FLUSHED = 3,
437 };
438
439 /*
440 * mds client state
441 */
442 struct ceph_mds_client {
443 struct ceph_fs_client *fsc;
444 struct mutex mutex; /* all nested structures */
445
446 struct ceph_mdsmap *mdsmap;
447 struct completion safe_umount_waiters;
448 wait_queue_head_t session_close_wq;
449 struct list_head waiting_for_map;
450 int mdsmap_err;
451
452 struct ceph_mds_session **sessions; /* NULL for mds if no session */
453 atomic_t num_sessions;
454 int max_sessions; /* len of sessions array */
455
456 spinlock_t stopping_lock; /* protect snap_empty */
457 int stopping; /* the stage of shutting down */
458 atomic_t stopping_blockers;
459 struct completion stopping_waiter;
460
461 atomic64_t quotarealms_count; /* # realms with quota */
462 /*
463 * We keep a list of inodes we don't see in the mountpoint but that we
464 * need to track quota realms.
465 */
466 struct rb_root quotarealms_inodes;
467 struct mutex quotarealms_inodes_mutex;
468
469 /*
470 * snap_rwsem will cover cap linkage into snaprealms, and
471 * realm snap contexts. (later, we can do per-realm snap
472 * contexts locks..) the empty list contains realms with no
473 * references (implying they contain no inodes with caps) that
474 * should be destroyed.
475 */
476 u64 last_snap_seq;
477 struct rw_semaphore snap_rwsem;
478 struct rb_root snap_realms;
479 struct list_head snap_empty;
480 int num_snap_realms;
481 spinlock_t snap_empty_lock; /* protect snap_empty */
482
483 u64 last_tid; /* most recent mds request */
484 u64 oldest_tid; /* oldest incomplete mds request,
485 excluding setfilelock requests */
486 struct rb_root request_tree; /* pending mds requests */
487 struct delayed_work delayed_work; /* delayed work */
488 unsigned long last_renew_caps; /* last time we renewed our caps */
489 struct list_head cap_delay_list; /* caps with delayed release */
490 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */
491 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */
492 struct list_head snap_flush_list; /* cap_snaps ready to flush */
493 spinlock_t snap_flush_lock;
494
495 u64 last_cap_flush_tid;
496 struct list_head cap_flush_list;
497 struct list_head cap_dirty_migrating; /* ...that are migration... */
498 int num_cap_flushing; /* # caps we are flushing */
499 spinlock_t cap_dirty_lock; /* protects above items */
500 wait_queue_head_t cap_flushing_wq;
501
502 struct work_struct cap_reclaim_work;
503 atomic_t cap_reclaim_pending;
504
505 struct work_struct cap_unlink_work;
506
507 /*
508 * Cap reservations
509 *
510 * Maintain a global pool of preallocated struct ceph_caps, referenced
511 * by struct ceph_caps_reservations. This ensures that we preallocate
512 * memory needed to successfully process an MDS response. (If an MDS
513 * sends us cap information and we fail to process it, we will have
514 * problems due to the client and MDS being out of sync.)
515 *
516 * Reservations are 'owned' by a ceph_cap_reservation context.
517 */
518 spinlock_t caps_list_lock;
519 struct list_head caps_list; /* unused (reserved or
520 unreserved) */
521 #ifdef CONFIG_DEBUG_FS
522 struct list_head cap_wait_list;
523 #endif
524 int caps_total_count; /* total caps allocated */
525 int caps_use_count; /* in use */
526 int caps_use_max; /* max used caps */
527 int caps_reserve_count; /* unused, reserved */
528 int caps_avail_count; /* unused, unreserved */
529 int caps_min_count; /* keep at least this many
530 (unreserved) */
531 spinlock_t dentry_list_lock;
532 struct list_head dentry_leases; /* fifo list */
533 struct list_head dentry_dir_leases; /* lru list */
534
535 struct ceph_client_metric metric;
536
537 spinlock_t snapid_map_lock;
538 struct rb_root snapid_map_tree;
539 struct list_head snapid_map_lru;
540
541 struct rw_semaphore pool_perm_rwsem;
542 struct rb_root pool_perm_tree;
543
544 u32 s_cap_auths_num;
545 struct ceph_mds_cap_auth *s_cap_auths;
546
547 char nodename[__NEW_UTS_LEN + 1];
548 };
549
550 extern const char *ceph_mds_op_name(int op);
551
552 extern bool check_session_state(struct ceph_mds_session *s);
553 void inc_session_sequence(struct ceph_mds_session *s);
554
555 extern struct ceph_mds_session *
556 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
557
558 extern const char *ceph_session_state_name(int s);
559
560 extern struct ceph_mds_session *
561 ceph_get_mds_session(struct ceph_mds_session *s);
562 extern void ceph_put_mds_session(struct ceph_mds_session *s);
563
564 extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
565 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
566 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
567 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
568
569 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
570
571 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
572 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
573 struct inode *dir);
574 extern struct ceph_mds_request *
575 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
576 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
577 struct inode *dir,
578 struct ceph_mds_request *req);
579 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
580 struct ceph_mds_request *req,
581 ceph_mds_request_wait_callback_t wait_func);
582 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
583 struct inode *dir,
584 struct ceph_mds_request *req);
585 extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
586 extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
ceph_mdsc_get_request(struct ceph_mds_request * req)587 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
588 {
589 kref_get(&req->r_kref);
590 }
591 extern void ceph_mdsc_release_request(struct kref *kref);
ceph_mdsc_put_request(struct ceph_mds_request * req)592 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
593 {
594 kref_put(&req->r_kref, ceph_mdsc_release_request);
595 }
596
597 extern void send_flush_mdlog(struct ceph_mds_session *s);
598 extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
599 void (*cb)(struct ceph_mds_session *),
600 bool check_state);
601 extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
602 extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
603 struct ceph_cap *cap);
604 extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
605 struct ceph_mds_session *session);
606 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
607 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
608 extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
609 extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
610 int (*cb)(struct inode *, int mds, void *),
611 void *arg);
612 extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,
613 int mask);
614
615 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
616
ceph_mdsc_free_path(char * path,int len)617 static inline void ceph_mdsc_free_path(char *path, int len)
618 {
619 if (!IS_ERR_OR_NULL(path))
620 __putname(path - (PATH_MAX - 1 - len));
621 }
622
623 extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
624 struct dentry *dentry, int *plen, u64 *base,
625 int for_wire);
626
627 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
628 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
629 struct dentry *dentry, char action,
630 u32 seq);
631
632 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
633 struct ceph_msg *msg);
634 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
635 struct ceph_msg *msg);
636
637 extern struct ceph_mds_session *
638 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
639
640 extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
641 struct ceph_mds_session *session,
642 int max_caps);
643
ceph_wait_on_async_create(struct inode * inode)644 static inline int ceph_wait_on_async_create(struct inode *inode)
645 {
646 struct ceph_inode_info *ci = ceph_inode(inode);
647
648 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
649 TASK_KILLABLE);
650 }
651
652 extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
653 extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
654 extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
655
656 extern bool enable_unsafe_idmap;
657 #endif
658