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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 */
25enum 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
76struct ceph_fs_client;
77struct ceph_cap;
78
79#define MDS_AUTH_UID_ANY -1
80#define CEPH_GET_CAPS_WAIT_TIMEOUT (5 * HZ)
81#define CEPH_CAP_FLUSH_WAIT_TIMEOUT_SEC 60
82#define CEPH_CAP_FLUSH_MAX_DUMP_ENTRIES 5
83#define CEPH_CAP_FLUSH_MAX_DUMP_ITERS 5
84#define CEPH_CLIENT_RESET_REASON_LEN 64
85#define CEPH_CLIENT_RESET_DRAIN_SEC 30
86#define CEPH_CLIENT_RESET_CLOSE_GRACE_MS 100
87#define CEPH_CLIENT_RESET_WAIT_TIMEOUT_SEC 120
88
89enum ceph_client_reset_phase {
90 CEPH_CLIENT_RESET_IDLE = 0,
91 /*
92 * QUIESCING is set synchronously by schedule_reset() before the
93 * workqueue item is dispatched. It gates new requests (any
94 * phase != IDLE blocks callers) during the window between
95 * scheduling and the work function's transition to DRAINING.
96 */
97 CEPH_CLIENT_RESET_QUIESCING,
98 CEPH_CLIENT_RESET_DRAINING,
99 CEPH_CLIENT_RESET_TEARDOWN,
100};
101
102struct ceph_client_reset_state {
103 spinlock_t lock; /* protects all fields below */
104 u64 trigger_count; /* number of resets triggered */
105 u64 success_count; /* number of successful resets */
106 u64 failure_count; /* number of failed resets */
107 unsigned long last_start; /* jiffies when last reset started */
108 unsigned long last_finish; /* jiffies when last reset finished */
109 int last_errno; /* result of most recent reset */
110 enum ceph_client_reset_phase phase; /* current reset phase */
111 bool drain_timed_out; /* drain exceeded timeout */
112 bool shutdown; /* destroy in progress */
113 int sessions_reset; /* sessions torn down in last reset */
114 char last_reason[CEPH_CLIENT_RESET_REASON_LEN]; /* operator-supplied reason */
115
116 /* Request blocking during reset */
117 wait_queue_head_t blocked_wq; /* waitqueue for blocked callers */
118 atomic_t blocked_requests; /* count of blocked callers */
119};
120
121static inline bool ceph_reset_is_idle(struct ceph_client_reset_state *st)
122{
123 return READ_ONCE(st->phase) == CEPH_CLIENT_RESET_IDLE;
124}
125
126struct ceph_mds_cap_match {
127 s64 uid; /* default to MDS_AUTH_UID_ANY */
128 u32 num_gids;
129 u32 *gids; /* use these GIDs */
130 char *path; /* require path to be child of this
131 (may be "" or "/" for any) */
132 char *fs_name;
133 bool root_squash; /* default to false */
134};
135
136struct ceph_mds_cap_auth {
137 struct ceph_mds_cap_match match;
138 bool readable;
139 bool writeable;
140};
141
142/*
143 * parsed info about a single inode. pointers are into the encoded
144 * on-wire structures within the mds reply message payload.
145 */
146struct ceph_mds_reply_info_in {
147 struct ceph_mds_reply_inode *in;
148 struct ceph_dir_layout dir_layout;
149 u32 symlink_len;
150 char *symlink;
151 u32 xattr_len;
152 char *xattr_data;
153 u64 inline_version;
154 u32 inline_len;
155 char *inline_data;
156 u32 pool_ns_len;
157 char *pool_ns_data;
158 u64 max_bytes;
159 u64 max_files;
160 s32 dir_pin;
161 struct ceph_timespec btime;
162 struct ceph_timespec snap_btime;
163 u8 *fscrypt_auth;
164 u8 *fscrypt_file;
165 u32 fscrypt_auth_len;
166 u32 fscrypt_file_len;
167 u64 rsnaps;
168 u64 change_attr;
169 u64 subvolume_id;
170};
171
172struct ceph_mds_reply_dir_entry {
173 bool is_nokey;
174 char *name;
175 u32 name_len;
176 u32 raw_hash;
177 struct ceph_mds_reply_lease *lease;
178 struct ceph_mds_reply_info_in inode;
179 loff_t offset;
180};
181
182struct ceph_mds_reply_xattr {
183 char *xattr_value;
184 size_t xattr_value_len;
185};
186
187/*
188 * parsed info about an mds reply, including information about
189 * either: 1) the target inode and/or its parent directory and dentry,
190 * and directory contents (for readdir results), or
191 * 2) the file range lock info (for fcntl F_GETLK results).
192 */
193struct ceph_mds_reply_info_parsed {
194 struct ceph_mds_reply_head *head;
195
196 /* trace */
197 struct ceph_mds_reply_info_in diri, targeti;
198 struct ceph_mds_reply_dirfrag *dirfrag;
199 char *dname;
200 u8 *altname;
201 u32 dname_len;
202 u32 altname_len;
203 struct ceph_mds_reply_lease *dlease;
204 struct ceph_mds_reply_xattr xattr_info;
205
206 /* extra */
207 union {
208 /* for fcntl F_GETLK results */
209 struct ceph_filelock *filelock_reply;
210
211 /* for readdir results */
212 struct {
213 struct ceph_mds_reply_dirfrag *dir_dir;
214 size_t dir_buf_size;
215 int dir_nr;
216 bool dir_end;
217 bool dir_complete;
218 bool hash_order;
219 bool offset_hash;
220 struct ceph_mds_reply_dir_entry *dir_entries;
221 };
222
223 /* for create results */
224 struct {
225 bool has_create_ino;
226 u64 ino;
227 };
228 };
229
230 /* encoded blob describing snapshot contexts for certain
231 operations (e.g., open) */
232 void *snapblob;
233 int snapblob_len;
234};
235
236
237/*
238 * cap releases are batched and sent to the MDS en masse.
239 *
240 * Account for per-message overhead of mds_cap_release header
241 * and __le32 for osd epoch barrier trailing field.
242 */
243#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \
244 sizeof(struct ceph_mds_cap_release)) / \
245 sizeof(struct ceph_mds_cap_item))
246
247
248/*
249 * state associated with each MDS<->client session
250 */
251enum {
252 CEPH_MDS_SESSION_NEW = 1,
253 CEPH_MDS_SESSION_OPENING = 2,
254 CEPH_MDS_SESSION_OPEN = 3,
255 CEPH_MDS_SESSION_HUNG = 4,
256 CEPH_MDS_SESSION_RESTARTING = 5,
257 CEPH_MDS_SESSION_RECONNECTING = 6,
258 CEPH_MDS_SESSION_CLOSING = 7,
259 CEPH_MDS_SESSION_CLOSED = 8,
260 CEPH_MDS_SESSION_REJECTED = 9,
261};
262
263struct ceph_mds_session {
264 struct ceph_mds_client *s_mdsc;
265 int s_mds;
266 int s_state;
267 unsigned long s_ttl; /* time until mds kills us */
268 unsigned long s_features;
269 u64 s_seq; /* incoming msg seq # */
270 struct mutex s_mutex; /* serialize session messages */
271
272 struct ceph_connection s_con;
273
274 struct ceph_auth_handshake s_auth;
275
276 atomic_t s_cap_gen; /* inc each time we get mds stale msg */
277 unsigned long s_cap_ttl; /* when session caps expire. protected by s_mutex */
278
279 /* protected by s_cap_lock */
280 spinlock_t s_cap_lock;
281 refcount_t s_ref;
282 struct list_head s_caps; /* all caps issued by this session */
283 struct ceph_cap *s_cap_iterator;
284 int s_nr_caps;
285 int s_num_cap_releases;
286 int s_cap_reconnect;
287 int s_readonly;
288 struct list_head s_cap_releases; /* waiting cap_release messages */
289 struct work_struct s_cap_release_work;
290
291 /* See ceph_inode_info->i_dirty_item. */
292 struct list_head s_cap_dirty; /* inodes w/ dirty caps */
293
294 /* See ceph_inode_info->i_flushing_item. */
295 struct list_head s_cap_flushing; /* inodes w/ flushing caps */
296
297 unsigned long s_renew_requested; /* last time we sent a renew req */
298 u64 s_renew_seq;
299
300 struct list_head s_waiting; /* waiting requests */
301 struct list_head s_unsafe; /* unsafe requests */
302 struct xarray s_delegated_inos;
303 atomic_t s_num_deleg_inos;
304};
305
306/*
307 * modes of choosing which MDS to send a request to
308 */
309enum {
310 USE_ANY_MDS,
311 USE_RANDOM_MDS,
312 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
313};
314
315struct ceph_mds_request;
316struct ceph_mds_client;
317
318/*
319 * request completion callback
320 */
321typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
322 struct ceph_mds_request *req);
323/*
324 * wait for request completion callback
325 */
326typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc,
327 struct ceph_mds_request *req);
328
329/*
330 * an in-flight mds request
331 */
332struct ceph_mds_request {
333 u64 r_tid; /* transaction id */
334 struct rb_node r_node;
335 struct ceph_mds_client *r_mdsc;
336
337 struct kref r_kref;
338 int r_op; /* mds op code */
339
340 /* operation on what? */
341 struct inode *r_inode; /* arg1 */
342 struct dentry *r_dentry; /* arg1 */
343 struct dentry *r_old_dentry; /* arg2: rename from or link from */
344 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
345 char *r_path1, *r_path2;
346 struct ceph_vino r_ino1, r_ino2;
347
348 struct inode *r_parent; /* parent dir inode */
349 struct inode *r_target_inode; /* resulting inode */
350 struct inode *r_new_inode; /* new inode (for creates) */
351
352 const struct qstr *r_dname; /* stable name (for ->d_revalidate) */
353
354#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */
355#define CEPH_MDS_R_ABORTED (2) /* call was aborted */
356#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */
357#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */
358#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */
359#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */
360#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */
361#define CEPH_MDS_R_ASYNC (8) /* async request */
362#define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */
363 unsigned long r_req_flags;
364
365 struct mutex r_fill_mutex;
366
367 union ceph_mds_request_args r_args;
368
369 struct ceph_fscrypt_auth *r_fscrypt_auth;
370 u64 r_fscrypt_file;
371
372 u8 *r_altname; /* fscrypt binary crypttext for long filenames */
373 u32 r_altname_len; /* length of r_altname */
374
375 int r_fmode; /* file mode, if expecting cap */
376 int r_request_release_offset;
377 const struct cred *r_cred;
378 const struct mnt_idmap *r_mnt_idmap;
379 struct timespec64 r_stamp;
380
381 /* for choosing which mds to send this request to */
382 int r_direct_mode;
383 u32 r_direct_hash; /* choose dir frag based on this dentry hash */
384
385 /* data payload is used for xattr ops */
386 struct ceph_pagelist *r_pagelist;
387
388 /* what caps shall we drop? */
389 int r_inode_drop, r_inode_unless;
390 int r_dentry_drop, r_dentry_unless;
391 int r_old_dentry_drop, r_old_dentry_unless;
392 struct inode *r_old_inode;
393 int r_old_inode_drop, r_old_inode_unless;
394
395 struct ceph_msg *r_request; /* original request */
396 struct ceph_msg *r_reply;
397 struct ceph_mds_reply_info_parsed r_reply_info;
398 int r_err;
399 u32 r_readdir_offset;
400
401 struct page *r_locked_page;
402 int r_dir_caps;
403 int r_num_caps;
404
405 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */
406 unsigned long r_started; /* start time to measure timeout against */
407 unsigned long r_start_latency; /* start time to measure latency */
408 unsigned long r_end_latency; /* finish time to measure latency */
409 unsigned long r_request_started; /* start time for mds request only,
410 used to measure lease durations */
411
412 /* link unsafe requests to parent directory, for fsync */
413 struct inode *r_unsafe_dir;
414 struct list_head r_unsafe_dir_item;
415
416 /* unsafe requests that modify the target inode */
417 struct list_head r_unsafe_target_item;
418
419 struct ceph_mds_session *r_session;
420
421 int r_attempts; /* resend attempts */
422 int r_num_fwd; /* number of forward attempts */
423 int r_resend_mds; /* mds to resend to next, if any*/
424 u32 r_sent_on_mseq; /* cap mseq request was sent at*/
425 u64 r_deleg_ino;
426
427 struct list_head r_wait;
428 struct completion r_completion;
429 struct completion r_safe_completion;
430 ceph_mds_request_callback_t r_callback;
431 struct list_head r_unsafe_item; /* per-session unsafe list item */
432
433 long long r_dir_release_cnt;
434 long long r_dir_ordered_cnt;
435 int r_readdir_cache_idx;
436
437 int r_feature_needed;
438
439 struct ceph_cap_reservation r_caps_reservation;
440};
441
442struct ceph_pool_perm {
443 struct rb_node node;
444 int perm;
445 s64 pool;
446 size_t pool_ns_len;
447 char pool_ns[];
448};
449
450struct ceph_snapid_map {
451 struct rb_node node;
452 struct list_head lru;
453 atomic_t ref;
454 dev_t dev;
455 u64 snap;
456 unsigned long last_used;
457};
458
459/*
460 * node for list of quotarealm inodes that are not visible from the filesystem
461 * mountpoint, but required to handle, e.g. quotas.
462 */
463struct ceph_quotarealm_inode {
464 struct rb_node node;
465 u64 ino;
466 unsigned long timeout; /* last time a lookup failed for this inode */
467 struct mutex mutex;
468 struct inode *inode;
469};
470
471#ifdef CONFIG_DEBUG_FS
472
473struct cap_wait {
474 struct list_head list;
475 u64 ino;
476 pid_t tgid;
477 int need;
478 int want;
479};
480
481#endif
482
483enum {
484 CEPH_MDSC_STOPPING_BEGIN = 1,
485 CEPH_MDSC_STOPPING_FLUSHING = 2,
486 CEPH_MDSC_STOPPING_FLUSHED = 3,
487};
488
489/*
490 * mds client state
491 */
492struct ceph_mds_client {
493 struct ceph_fs_client *fsc;
494 struct mutex mutex; /* all nested structures */
495
496 struct ceph_mdsmap *mdsmap;
497 struct completion safe_umount_waiters;
498 wait_queue_head_t session_close_wq;
499 struct list_head waiting_for_map;
500 int mdsmap_err;
501
502 struct ceph_mds_session **sessions; /* NULL for mds if no session */
503 atomic_t num_sessions;
504 int max_sessions; /* len of sessions array */
505
506 spinlock_t stopping_lock; /* protect snap_empty */
507 int stopping; /* the stage of shutting down */
508 atomic_t stopping_blockers;
509 struct completion stopping_waiter;
510
511 atomic64_t dirty_folios;
512 wait_queue_head_t flush_end_wq;
513
514 atomic64_t quotarealms_count; /* # realms with quota */
515 /*
516 * We keep a list of inodes we don't see in the mountpoint but that we
517 * need to track quota realms.
518 */
519 struct rb_root quotarealms_inodes;
520 struct mutex quotarealms_inodes_mutex;
521
522 /*
523 * snap_rwsem will cover cap linkage into snaprealms, and
524 * realm snap contexts. (later, we can do per-realm snap
525 * contexts locks..) the empty list contains realms with no
526 * references (implying they contain no inodes with caps) that
527 * should be destroyed.
528 */
529 u64 last_snap_seq;
530 struct rw_semaphore snap_rwsem;
531 struct rb_root snap_realms;
532 struct list_head snap_empty;
533 int num_snap_realms;
534 spinlock_t snap_empty_lock; /* protect snap_empty */
535
536 u64 last_tid; /* most recent mds request */
537 u64 oldest_tid; /* oldest incomplete mds request,
538 excluding setfilelock requests */
539 struct rb_root request_tree; /* pending mds requests */
540 struct delayed_work delayed_work; /* delayed work */
541 unsigned long last_renew_caps; /* last time we renewed our caps */
542 struct list_head cap_delay_list; /* caps with delayed release */
543 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */
544 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */
545 struct list_head snap_flush_list; /* cap_snaps ready to flush */
546 spinlock_t snap_flush_lock;
547
548 u64 last_cap_flush_tid;
549 struct list_head cap_flush_list;
550 struct list_head cap_dirty_migrating; /* ...that are migration... */
551 int num_cap_flushing; /* # caps we are flushing */
552 spinlock_t cap_dirty_lock; /* protects above items */
553 wait_queue_head_t cap_flushing_wq;
554
555 struct work_struct cap_reclaim_work;
556 atomic_t cap_reclaim_pending;
557
558 struct work_struct cap_unlink_work;
559
560 /*
561 * Cap reservations
562 *
563 * Maintain a global pool of preallocated struct ceph_caps, referenced
564 * by struct ceph_caps_reservations. This ensures that we preallocate
565 * memory needed to successfully process an MDS response. (If an MDS
566 * sends us cap information and we fail to process it, we will have
567 * problems due to the client and MDS being out of sync.)
568 *
569 * Reservations are 'owned' by a ceph_cap_reservation context.
570 */
571 spinlock_t caps_list_lock;
572 struct list_head caps_list; /* unused (reserved or
573 unreserved) */
574#ifdef CONFIG_DEBUG_FS
575 struct list_head cap_wait_list;
576#endif
577 int caps_total_count; /* total caps allocated */
578 int caps_use_count; /* in use */
579 int caps_use_max; /* max used caps */
580 int caps_reserve_count; /* unused, reserved */
581 int caps_avail_count; /* unused, unreserved */
582 int caps_min_count; /* keep at least this many
583 (unreserved) */
584 spinlock_t dentry_list_lock;
585 struct list_head dentry_leases; /* fifo list */
586 struct list_head dentry_dir_leases; /* lru list */
587
588 struct ceph_client_metric metric;
589 struct work_struct reset_work;
590 struct ceph_client_reset_state reset_state;
591 struct ceph_subvolume_metrics_tracker subvol_metrics;
592
593 /* Subvolume metrics send tracking */
594 struct mutex subvol_metrics_last_mutex;
595 struct ceph_subvol_metric_snapshot *subvol_metrics_last;
596 u32 subvol_metrics_last_nr;
597 u64 subvol_metrics_sent;
598 u64 subvol_metrics_nonzero_sends;
599
600 spinlock_t snapid_map_lock;
601 struct rb_root snapid_map_tree;
602 struct list_head snapid_map_lru;
603
604 struct rw_semaphore pool_perm_rwsem;
605 struct rb_root pool_perm_tree;
606
607 /* protected by mutex */
608 u32 s_cap_auths_num;
609 struct ceph_mds_cap_auth *s_cap_auths;
610
611 char nodename[__NEW_UTS_LEN + 1];
612};
613
614extern const char *ceph_mds_op_name(int op);
615
616extern bool check_session_state(struct ceph_mds_session *s);
617void inc_session_sequence(struct ceph_mds_session *s);
618
619extern struct ceph_mds_session *
620__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
621
622extern const char *ceph_session_state_name(int s);
623extern const char *ceph_reset_phase_name(enum ceph_client_reset_phase phase);
624
625extern struct ceph_mds_session *
626ceph_get_mds_session(struct ceph_mds_session *s);
627extern void ceph_put_mds_session(struct ceph_mds_session *s);
628int ceph_mdsc_schedule_reset(struct ceph_mds_client *mdsc,
629 const char *reason);
630int ceph_mdsc_wait_for_reset(struct ceph_mds_client *mdsc);
631
632extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
633extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
634extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc);
635extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
636
637extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
638
639extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
640extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req,
641 struct inode *dir);
642extern struct ceph_mds_request *
643ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
644extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
645 struct inode *dir,
646 struct ceph_mds_request *req);
647int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc,
648 struct ceph_mds_request *req,
649 ceph_mds_request_wait_callback_t wait_func);
650extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
651 struct inode *dir,
652 struct ceph_mds_request *req);
653extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req);
654extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req);
655static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
656{
657 kref_get(&req->r_kref);
658}
659extern void ceph_mdsc_release_request(struct kref *kref);
660static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
661{
662 kref_put(&req->r_kref, ceph_mdsc_release_request);
663}
664
665extern void send_flush_mdlog(struct ceph_mds_session *s);
666extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc,
667 void (*cb)(struct ceph_mds_session *),
668 bool check_state);
669extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq);
670extern void __ceph_queue_cap_release(struct ceph_mds_session *session,
671 struct ceph_cap *cap);
672extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc,
673 struct ceph_mds_session *session);
674extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc);
675extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr);
676extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc);
677extern int ceph_iterate_session_caps(struct ceph_mds_session *session,
678 int (*cb)(struct inode *, int mds, void *),
679 void *arg);
680extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath,
681 int mask);
682
683extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
684
685/*
686 * Structure to group path-related output parameters for build_*_path functions
687 */
688struct ceph_path_info {
689 const char *path;
690 int pathlen;
691 struct ceph_vino vino;
692 bool freepath;
693};
694
695static inline void ceph_mdsc_free_path_info(const struct ceph_path_info *path_info)
696{
697 if (path_info && path_info->freepath && !IS_ERR_OR_NULL(path_info->path))
698 __putname((char *)path_info->path - (PATH_MAX - 1 - path_info->pathlen));
699}
700
701extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc,
702 struct dentry *dentry, struct ceph_path_info *path_info,
703 int for_wire);
704
705extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
706extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
707 struct dentry *dentry, char action,
708 u32 seq);
709
710extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc,
711 struct ceph_msg *msg);
712extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc,
713 struct ceph_msg *msg);
714
715extern struct ceph_mds_session *
716ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target);
717
718extern int ceph_trim_caps(struct ceph_mds_client *mdsc,
719 struct ceph_mds_session *session,
720 int max_caps);
721
722static inline int ceph_wait_on_async_create(struct inode *inode)
723{
724 struct ceph_inode_info *ci = ceph_inode(inode);
725
726 return wait_on_bit(&ci->i_ceph_flags, CEPH_I_ASYNC_CREATE_BIT,
727 TASK_KILLABLE);
728}
729
730extern int ceph_wait_on_conflict_unlink(struct dentry *dentry);
731extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session);
732extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino);
733
734extern bool enable_unsafe_idmap;
735#endif