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 "subvolume_metrics.h"
22 #include "super.h"
23
24 /* The first 8 bits are reserved for old ceph releases */
25 enum ceph_feature_type {
26 CEPHFS_FEATURE_MIMIC = 8,
27 CEPHFS_FEATURE_REPLY_ENCODING,
28 CEPHFS_FEATURE_RECLAIM_CLIENT,
29 CEPHFS_FEATURE_LAZY_CAP_WANTED,
30 CEPHFS_FEATURE_MULTI_RECONNECT,
31 CEPHFS_FEATURE_DELEG_INO,
32 CEPHFS_FEATURE_METRIC_COLLECT,
33 CEPHFS_FEATURE_ALTERNATE_NAME,
34 CEPHFS_FEATURE_NOTIFY_SESSION_STATE,
35 CEPHFS_FEATURE_OP_GETVXATTR,
36 CEPHFS_FEATURE_32BITS_RETRY_FWD,
37 CEPHFS_FEATURE_NEW_SNAPREALM_INFO,
38 CEPHFS_FEATURE_HAS_OWNER_UIDGID,
39 CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK,
40 CEPHFS_FEATURE_SUBVOLUME_METRICS,
41
42 CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_SUBVOLUME_METRICS,
43 };
44
45 #define CEPHFS_FEATURES_CLIENT_SUPPORTED { \
46 0, 1, 2, 3, 4, 5, 6, 7, \
47 CEPHFS_FEATURE_MIMIC, \
48 CEPHFS_FEATURE_REPLY_ENCODING, \
49 CEPHFS_FEATURE_LAZY_CAP_WANTED, \
50 CEPHFS_FEATURE_MULTI_RECONNECT, \
51 CEPHFS_FEATURE_DELEG_INO, \
52 CEPHFS_FEATURE_METRIC_COLLECT, \
53 CEPHFS_FEATURE_ALTERNATE_NAME, \
54 CEPHFS_FEATURE_NOTIFY_SESSION_STATE, \
55 CEPHFS_FEATURE_OP_GETVXATTR, \
56 CEPHFS_FEATURE_32BITS_RETRY_FWD, \
57 CEPHFS_FEATURE_HAS_OWNER_UIDGID, \
58 CEPHFS_FEATURE_MDS_AUTH_CAPS_CHECK, \
59 CEPHFS_FEATURE_SUBVOLUME_METRICS, \
60 }
61
62 /*
63 * Some lock dependencies:
64 *
65 * session->s_mutex
66 * mdsc->mutex
67 *
68 * mdsc->snap_rwsem
69 *
70 * ci->i_ceph_lock
71 * mdsc->snap_flush_lock
72 * mdsc->cap_delay_lock
73 *
74 */
75
76 struct ceph_fs_client;
77 struct ceph_cap;
78
79 #define MDS_AUTH_UID_ANY -1
80
81 struct ceph_mds_cap_match {
82 s64 uid; /* default to MDS_AUTH_UID_ANY */
83 u32 num_gids;
84 u32 *gids; /* use these GIDs */
85 char *path; /* require path to be child of this
86 (may be "" or "/" for any) */
87 char *fs_name;
88 bool root_squash; /* default to false */
89 };
90
91 struct ceph_mds_cap_auth {
92 struct ceph_mds_cap_match match;
93 bool readable;
94 bool writeable;
95 };
96
97 /*
98 * parsed info about a single inode. pointers are into the encoded
99 * on-wire structures within the mds reply message payload.
100 */
101 struct ceph_mds_reply_info_in {
102 struct ceph_mds_reply_inode *in;
103 struct ceph_dir_layout dir_layout;
104 u32 symlink_len;
105 char *symlink;
106 u32 xattr_len;
107 char *xattr_data;
108 u64 inline_version;
109 u32 inline_len;
110 char *inline_data;
111 u32 pool_ns_len;
112 char *pool_ns_data;
113 u64 max_bytes;
114 u64 max_files;
115 s32 dir_pin;
116 struct ceph_timespec btime;
117 struct ceph_timespec snap_btime;
118 u8 *fscrypt_auth;
119 u8 *fscrypt_file;
120 u32 fscrypt_auth_len;
121 u32 fscrypt_file_len;
122 u64 rsnaps;
123 u64 change_attr;
124 u64 subvolume_id;
125 };
126
127 struct ceph_mds_reply_dir_entry {
128 bool is_nokey;
129 char *name;
130 u32 name_len;
131 u32 raw_hash;
132 struct ceph_mds_reply_lease *lease;
133 struct ceph_mds_reply_info_in inode;
134 loff_t offset;
135 };
136
137 struct ceph_mds_reply_xattr {
138 char *xattr_value;
139 size_t xattr_value_len;
140 };
141
142 /*
143 * parsed info about an mds reply, including information about
144 * either: 1) the target inode and/or its parent directory and dentry,
145 * and directory contents (for readdir results), or
146 * 2) the file range lock info (for fcntl F_GETLK results).
147 */
148 struct ceph_mds_reply_info_parsed {
149 struct ceph_mds_reply_head *head;
150
151 /* trace */
152 struct ceph_mds_reply_info_in diri, targeti;
153 struct ceph_mds_reply_dirfrag *dirfrag;
154 char *dname;
155 u8 *altname;
156 u32 dname_len;
157 u32 altname_len;
158 struct ceph_mds_reply_lease *dlease;
159 struct ceph_mds_reply_xattr xattr_info;
160
161 /* extra */
162 union {
163 /* for fcntl F_GETLK results */
164 struct ceph_filelock *filelock_reply;
165
166 /* for readdir results */
167 struct {
168 struct ceph_mds_reply_dirfrag *dir_dir;
169 size_t dir_buf_size;
170 int dir_nr;
171 bool dir_end;
172 bool dir_complete;
173 bool hash_order;
174 bool offset_hash;
175 struct ceph_mds_reply_dir_entry *dir_entries;
176 };
177
178 /* for create results */
179 struct {
180 bool has_create_ino;
181 u64 ino;
182 };
183 };
184
185 /* encoded blob describing snapshot contexts for certain
186 operations (e.g., open) */
187 void *snapblob;
188 int snapblob_len;
189 };
190
191
192 /*
193 * cap releases are batched and sent to the MDS en masse.
194 *
195 * Account for per-message overhead of mds_cap_release header
196 * and __le32 for osd epoch barrier trailing field.
197 */
198 #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
199 sizeof(struct ceph_mds_cap_release)) / \
200 sizeof(struct ceph_mds_cap_item))
201
202
203 /*
204 * state associated with each MDS<->client session
205 */
206 enum {
207 CEPH_MDS_SESSION_NEW = 1,
208 CEPH_MDS_SESSION_OPENING = 2,
209 CEPH_MDS_SESSION_OPEN = 3,
210 CEPH_MDS_SESSION_HUNG = 4,
211 CEPH_MDS_SESSION_RESTARTING = 5,
212 CEPH_MDS_SESSION_RECONNECTING = 6,
213 CEPH_MDS_SESSION_CLOSING = 7,
214 CEPH_MDS_SESSION_CLOSED = 8,
215 CEPH_MDS_SESSION_REJECTED = 9,
216 };
217
218 struct ceph_mds_session {
219 struct ceph_mds_client *s_mdsc;
220 int s_mds;
221 int s_state;
222 unsigned long s_ttl; /* time until mds kills us */
223 unsigned long s_features;
224 u64 s_seq; /* incoming msg seq # */
225 struct mutex s_mutex; /* serialize session messages */
226
227 struct ceph_connection s_con;
228
229 struct ceph_auth_handshake s_auth;
230
231 atomic_t s_cap_gen; /* inc each time we get mds stale msg */
232 unsigned long s_cap_ttl; /* when session caps expire. protected by s_mutex */
233
234 /* protected by s_cap_lock */
235 spinlock_t s_cap_lock;
236 refcount_t s_ref;
237 struct list_head s_caps; /* all caps issued by this session */
238 struct ceph_cap *s_cap_iterator;
239 int s_nr_caps;
240 int s_num_cap_releases;
241 int s_cap_reconnect;
242 int s_readonly;
243 struct list_head s_cap_releases; /* waiting cap_release messages */
244 struct work_struct s_cap_release_work;
245
246 /* See ceph_inode_info->i_dirty_item. */
247 struct list_head s_cap_dirty; /* inodes w/ dirty caps */
248
249 /* See ceph_inode_info->i_flushing_item. */
250 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
251
252 unsigned long s_renew_requested; /* last time we sent a renew req */
253 u64 s_renew_seq;
254
255 struct list_head s_waiting; /* waiting requests */
256 struct list_head s_unsafe; /* unsafe requests */
257 struct xarray s_delegated_inos;
258 };
259
260 /*
261 * modes of choosing which MDS to send a request to
262 */
263 enum {
264 USE_ANY_MDS,
265 USE_RANDOM_MDS,
266 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
267 };
268
269 struct ceph_mds_request;
270 struct ceph_mds_client;
271
272 /*
273 * request completion callback
274 */
275 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
276 struct ceph_mds_request *req);
277 /*
278 * wait for request completion callback
279 */
280 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
281 struct ceph_mds_request *req);
282
283 /*
284 * an in-flight mds request
285 */
286 struct ceph_mds_request {
287 u64 r_tid; /* transaction id */
288 struct rb_node r_node;
289 struct ceph_mds_client *r_mdsc;
290
291 struct kref r_kref;
292 int r_op; /* mds op code */
293
294 /* operation on what? */
295 struct inode *r_inode; /* arg1 */
296 struct dentry *r_dentry; /* arg1 */
297 struct dentry *r_old_dentry; /* arg2: rename from or link from */
298 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
299 char *r_path1, *r_path2;
300 struct ceph_vino r_ino1, r_ino2;
301
302 struct inode *r_parent; /* parent dir inode */
303 struct inode *r_target_inode; /* resulting inode */
304 struct inode *r_new_inode; /* new inode (for creates) */
305
306 const struct qstr *r_dname; /* stable name (for ->d_revalidate) */
307
308 #define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
309 #define CEPH_MDS_R_ABORTED (2) /* call was aborted */
310 #define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
311 #define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
312 #define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
313 #define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
314 #define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
315 #define CEPH_MDS_R_ASYNC (8) /* async request */
316 #define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */
317 unsigned long r_req_flags;
318
319 struct mutex r_fill_mutex;
320
321 union ceph_mds_request_args r_args;
322
323 struct ceph_fscrypt_auth *r_fscrypt_auth;
324 u64 r_fscrypt_file;
325
326 u8 *r_altname; /* fscrypt binary crypttext for long filenames */
327 u32 r_altname_len; /* length of r_altname */
328
329 int r_fmode; /* file mode, if expecting cap */
330 int r_request_release_offset;
331 const struct cred *r_cred;
332 struct mnt_idmap *r_mnt_idmap;
333 struct timespec64 r_stamp;
334
335 /* for choosing which mds to send this request to */
336 int r_direct_mode;
337 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
338
339 /* data payload is used for xattr ops */
340 struct ceph_pagelist *r_pagelist;
341
342 /* what caps shall we drop? */
343 int r_inode_drop, r_inode_unless;
344 int r_dentry_drop, r_dentry_unless;
345 int r_old_dentry_drop, r_old_dentry_unless;
346 struct inode *r_old_inode;
347 int r_old_inode_drop, r_old_inode_unless;
348
349 struct ceph_msg *r_request; /* original request */
350 struct ceph_msg *r_reply;
351 struct ceph_mds_reply_info_parsed r_reply_info;
352 int r_err;
353 u32 r_readdir_offset;
354
355 struct page *r_locked_page;
356 int r_dir_caps;
357 int r_num_caps;
358
359 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
360 unsigned long r_started; /* start time to measure timeout against */
361 unsigned long r_start_latency; /* start time to measure latency */
362 unsigned long r_end_latency; /* finish time to measure latency */
363 unsigned long r_request_started; /* start time for mds request only,
364 used to measure lease durations */
365
366 /* link unsafe requests to parent directory, for fsync */
367 struct inode *r_unsafe_dir;
368 struct list_head r_unsafe_dir_item;
369
370 /* unsafe requests that modify the target inode */
371 struct list_head r_unsafe_target_item;
372
373 struct ceph_mds_session *r_session;
374
375 int r_attempts; /* resend attempts */
376 int r_num_fwd; /* number of forward attempts */
377 int r_resend_mds; /* mds to resend to next, if any*/
378 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
379 u64 r_deleg_ino;
380
381 struct list_head r_wait;
382 struct completion r_completion;
383 struct completion r_safe_completion;
384 ceph_mds_request_callback_t r_callback;
385 struct list_head r_unsafe_item; /* per-session unsafe list item */
386
387 long long r_dir_release_cnt;
388 long long r_dir_ordered_cnt;
389 int r_readdir_cache_idx;
390
391 int r_feature_needed;
392
393 struct ceph_cap_reservation r_caps_reservation;
394 };
395
396 struct ceph_pool_perm {
397 struct rb_node node;
398 int perm;
399 s64 pool;
400 size_t pool_ns_len;
401 char pool_ns[];
402 };
403
404 struct ceph_snapid_map {
405 struct rb_node node;
406 struct list_head lru;
407 atomic_t ref;
408 dev_t dev;
409 u64 snap;
410 unsigned long last_used;
411 };
412
413 /*
414 * node for list of quotarealm inodes that are not visible from the filesystem
415 * mountpoint, but required to handle, e.g. quotas.
416 */
417 struct ceph_quotarealm_inode {
418 struct rb_node node;
419 u64 ino;
420 unsigned long timeout; /* last time a lookup failed for this inode */
421 struct mutex mutex;
422 struct inode *inode;
423 };
424
425 #ifdef CONFIG_DEBUG_FS
426
427 struct cap_wait {
428 struct list_head list;
429 u64 ino;
430 pid_t tgid;
431 int need;
432 int want;
433 };
434
435 #endif
436
437 enum {
438 CEPH_MDSC_STOPPING_BEGIN = 1,
439 CEPH_MDSC_STOPPING_FLUSHING = 2,
440 CEPH_MDSC_STOPPING_FLUSHED = 3,
441 };
442
443 /*
444 * mds client state
445 */
446 struct ceph_mds_client {
447 struct ceph_fs_client *fsc;
448 struct mutex mutex; /* all nested structures */
449
450 struct ceph_mdsmap *mdsmap;
451 struct completion safe_umount_waiters;
452 wait_queue_head_t session_close_wq;
453 struct list_head waiting_for_map;
454 int mdsmap_err;
455
456 struct ceph_mds_session **sessions; /* NULL for mds if no session */
457 atomic_t num_sessions;
458 int max_sessions; /* len of sessions array */
459
460 spinlock_t stopping_lock; /* protect snap_empty */
461 int stopping; /* the stage of shutting down */
462 atomic_t stopping_blockers;
463 struct completion stopping_waiter;
464
465 atomic64_t dirty_folios;
466 wait_queue_head_t flush_end_wq;
467
468 atomic64_t quotarealms_count; /* # realms with quota */
469 /*
470 * We keep a list of inodes we don't see in the mountpoint but that we
471 * need to track quota realms.
472 */
473 struct rb_root quotarealms_inodes;
474 struct mutex quotarealms_inodes_mutex;
475
476 /*
477 * snap_rwsem will cover cap linkage into snaprealms, and
478 * realm snap contexts. (later, we can do per-realm snap
479 * contexts locks..) the empty list contains realms with no
480 * references (implying they contain no inodes with caps) that
481 * should be destroyed.
482 */
483 u64 last_snap_seq;
484 struct rw_semaphore snap_rwsem;
485 struct rb_root snap_realms;
486 struct list_head snap_empty;
487 int num_snap_realms;
488 spinlock_t snap_empty_lock; /* protect snap_empty */
489
490 u64 last_tid; /* most recent mds request */
491 u64 oldest_tid; /* oldest incomplete mds request,
492 excluding setfilelock requests */
493 struct rb_root request_tree; /* pending mds requests */
494 struct delayed_work delayed_work; /* delayed work */
495 unsigned long last_renew_caps; /* last time we renewed our caps */
496 struct list_head cap_delay_list; /* caps with delayed release */
497 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */
498 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */
499 struct list_head snap_flush_list; /* cap_snaps ready to flush */
500 spinlock_t snap_flush_lock;
501
502 u64 last_cap_flush_tid;
503 struct list_head cap_flush_list;
504 struct list_head cap_dirty_migrating; /* ...that are migration... */
505 int num_cap_flushing; /* # caps we are flushing */
506 spinlock_t cap_dirty_lock; /* protects above items */
507 wait_queue_head_t cap_flushing_wq;
508
509 struct work_struct cap_reclaim_work;
510 atomic_t cap_reclaim_pending;
511
512 struct work_struct cap_unlink_work;
513
514 /*
515 * Cap reservations
516 *
517 * Maintain a global pool of preallocated struct ceph_caps, referenced
518 * by struct ceph_caps_reservations. This ensures that we preallocate
519 * memory needed to successfully process an MDS response. (If an MDS
520 * sends us cap information and we fail to process it, we will have
521 * problems due to the client and MDS being out of sync.)
522 *
523 * Reservations are 'owned' by a ceph_cap_reservation context.
524 */
525 spinlock_t caps_list_lock;
526 struct list_head caps_list; /* unused (reserved or
527 unreserved) */
528 #ifdef CONFIG_DEBUG_FS
529 struct list_head cap_wait_list;
530 #endif
531 int caps_total_count; /* total caps allocated */
532 int caps_use_count; /* in use */
533 int caps_use_max; /* max used caps */
534 int caps_reserve_count; /* unused, reserved */
535 int caps_avail_count; /* unused, unreserved */
536 int caps_min_count; /* keep at least this many
537 (unreserved) */
538 spinlock_t dentry_list_lock;
539 struct list_head dentry_leases; /* fifo list */
540 struct list_head dentry_dir_leases; /* lru list */
541
542 struct ceph_client_metric metric;
543 struct ceph_subvolume_metrics_tracker subvol_metrics;
544
545 /* Subvolume metrics send tracking */
546 struct mutex subvol_metrics_last_mutex;
547 struct ceph_subvol_metric_snapshot *subvol_metrics_last;
548 u32 subvol_metrics_last_nr;
549 u64 subvol_metrics_sent;
550 u64 subvol_metrics_nonzero_sends;
551
552 spinlock_t snapid_map_lock;
553 struct rb_root snapid_map_tree;
554 struct list_head snapid_map_lru;
555
556 struct rw_semaphore pool_perm_rwsem;
557 struct rb_root pool_perm_tree;
558
559 u32 s_cap_auths_num;
560 struct ceph_mds_cap_auth *s_cap_auths;
561
562 char nodename[__NEW_UTS_LEN + 1];
563 };
564
565 extern const char *ceph_mds_op_name(int op);
566
567 extern bool check_session_state(struct ceph_mds_session *s);
568 void inc_session_sequence(struct ceph_mds_session *s);
569
570 extern struct ceph_mds_session *
571 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
572
573 extern const char *ceph_session_state_name(int s);
574
575 extern struct ceph_mds_session *
576 ceph_get_mds_session(struct ceph_mds_session *s);
577 extern void ceph_put_mds_session(struct ceph_mds_session *s);
578
579 extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
580 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
581 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
582 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
583
584 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
585
586 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
587 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
588 struct inode *dir);
589 extern struct ceph_mds_request *
590 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
591 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
592 struct inode *dir,
593 struct ceph_mds_request *req);
594 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
595 struct ceph_mds_request *req,
596 ceph_mds_request_wait_callback_t wait_func);
597 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
598 struct inode *dir,
599 struct ceph_mds_request *req);
600 extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
601 extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
ceph_mdsc_get_request(struct ceph_mds_request * req)602 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
603 {
604 kref_get(&req->r_kref);
605 }
606 extern void ceph_mdsc_release_request(struct kref *kref);
ceph_mdsc_put_request(struct ceph_mds_request * req)607 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
608 {
609 kref_put(&req->r_kref, ceph_mdsc_release_request);
610 }
611
612 extern void send_flush_mdlog(struct ceph_mds_session *s);
613 extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
614 void (*cb)(struct ceph_mds_session *),
615 bool check_state);
616 extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
617 extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
618 struct ceph_cap *cap);
619 extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
620 struct ceph_mds_session *session);
621 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
622 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
623 extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
624 extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
625 int (*cb)(struct inode *, int mds, void *),
626 void *arg);
627 extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,
628 int mask);
629
630 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
631
632 /*
633 * Structure to group path-related output parameters for build_*_path functions
634 */
635 struct ceph_path_info {
636 const char *path;
637 int pathlen;
638 struct ceph_vino vino;
639 bool freepath;
640 };
641
ceph_mdsc_free_path_info(const struct ceph_path_info * path_info)642 static inline void ceph_mdsc_free_path_info(const struct ceph_path_info *path_info)
643 {
644 if (path_info && path_info->freepath && !IS_ERR_OR_NULL(path_info->path))
645 __putname((char *)path_info->path - (PATH_MAX - 1 - path_info->pathlen));
646 }
647
648 extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
649 struct dentry *dentry, struct ceph_path_info *path_info,
650 int for_wire);
651
652 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
653 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
654 struct dentry *dentry, char action,
655 u32 seq);
656
657 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
658 struct ceph_msg *msg);
659 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
660 struct ceph_msg *msg);
661
662 extern struct ceph_mds_session *
663 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
664
665 extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
666 struct ceph_mds_session *session,
667 int max_caps);
668
ceph_wait_on_async_create(struct inode * inode)669 static inline int ceph_wait_on_async_create(struct inode *inode)
670 {
671 struct ceph_inode_info *ci = ceph_inode(inode);
672
673 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT,
674 TASK_KILLABLE);
675 }
676
677 extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
678 extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
679 extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
680
681 extern bool enable_unsafe_idmap;
682 #endif
683