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 */ 24enum 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 73struct ceph_fs_client; 74struct ceph_cap; 75 76#define MDS_AUTH_UID_ANY -1 77 78struct 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 88struct 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 */ 98struct 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 123struct 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 133struct 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 */ 144struct 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 */ 202enum { 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 214struct 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 */ 259enum { 260 USE_ANY_MDS, 261 USE_RANDOM_MDS, 262 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ 263}; 264 265struct ceph_mds_request; 266struct ceph_mds_client; 267 268/* 269 * request completion callback 270 */ 271typedef 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 */ 276typedef 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 */ 282struct 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#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */ 303#define CEPH_MDS_R_ABORTED (2) /* call was aborted */ 304#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */ 305#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */ 306#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */ 307#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */ 308#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */ 309#define CEPH_MDS_R_ASYNC (8) /* async request */ 310#define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */ 311 unsigned long r_req_flags; 312 313 struct mutex r_fill_mutex; 314 315 union ceph_mds_request_args r_args; 316 317 struct ceph_fscrypt_auth *r_fscrypt_auth; 318 u64 r_fscrypt_file; 319 320 u8 *r_altname; /* fscrypt binary crypttext for long filenames */ 321 u32 r_altname_len; /* length of r_altname */ 322 323 int r_fmode; /* file mode, if expecting cap */ 324 int r_request_release_offset; 325 const struct cred *r_cred; 326 struct mnt_idmap *r_mnt_idmap; 327 struct timespec64 r_stamp; 328 329 /* for choosing which mds to send this request to */ 330 int r_direct_mode; 331 u32 r_direct_hash; /* choose dir frag based on this dentry hash */ 332 333 /* data payload is used for xattr ops */ 334 struct ceph_pagelist *r_pagelist; 335 336 /* what caps shall we drop? */ 337 int r_inode_drop, r_inode_unless; 338 int r_dentry_drop, r_dentry_unless; 339 int r_old_dentry_drop, r_old_dentry_unless; 340 struct inode *r_old_inode; 341 int r_old_inode_drop, r_old_inode_unless; 342 343 struct ceph_msg *r_request; /* original request */ 344 struct ceph_msg *r_reply; 345 struct ceph_mds_reply_info_parsed r_reply_info; 346 int r_err; 347 u32 r_readdir_offset; 348 349 struct page *r_locked_page; 350 int r_dir_caps; 351 int r_num_caps; 352 353 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ 354 unsigned long r_started; /* start time to measure timeout against */ 355 unsigned long r_start_latency; /* start time to measure latency */ 356 unsigned long r_end_latency; /* finish time to measure latency */ 357 unsigned long r_request_started; /* start time for mds request only, 358 used to measure lease durations */ 359 360 /* link unsafe requests to parent directory, for fsync */ 361 struct inode *r_unsafe_dir; 362 struct list_head r_unsafe_dir_item; 363 364 /* unsafe requests that modify the target inode */ 365 struct list_head r_unsafe_target_item; 366 367 struct ceph_mds_session *r_session; 368 369 int r_attempts; /* resend attempts */ 370 int r_num_fwd; /* number of forward attempts */ 371 int r_resend_mds; /* mds to resend to next, if any*/ 372 u32 r_sent_on_mseq; /* cap mseq request was sent at*/ 373 u64 r_deleg_ino; 374 375 struct list_head r_wait; 376 struct completion r_completion; 377 struct completion r_safe_completion; 378 ceph_mds_request_callback_t r_callback; 379 struct list_head r_unsafe_item; /* per-session unsafe list item */ 380 381 long long r_dir_release_cnt; 382 long long r_dir_ordered_cnt; 383 int r_readdir_cache_idx; 384 385 int r_feature_needed; 386 387 struct ceph_cap_reservation r_caps_reservation; 388}; 389 390struct ceph_pool_perm { 391 struct rb_node node; 392 int perm; 393 s64 pool; 394 size_t pool_ns_len; 395 char pool_ns[]; 396}; 397 398struct ceph_snapid_map { 399 struct rb_node node; 400 struct list_head lru; 401 atomic_t ref; 402 dev_t dev; 403 u64 snap; 404 unsigned long last_used; 405}; 406 407/* 408 * node for list of quotarealm inodes that are not visible from the filesystem 409 * mountpoint, but required to handle, e.g. quotas. 410 */ 411struct ceph_quotarealm_inode { 412 struct rb_node node; 413 u64 ino; 414 unsigned long timeout; /* last time a lookup failed for this inode */ 415 struct mutex mutex; 416 struct inode *inode; 417}; 418 419struct cap_wait { 420 struct list_head list; 421 u64 ino; 422 pid_t tgid; 423 int need; 424 int want; 425}; 426 427enum { 428 CEPH_MDSC_STOPPING_BEGIN = 1, 429 CEPH_MDSC_STOPPING_FLUSHING = 2, 430 CEPH_MDSC_STOPPING_FLUSHED = 3, 431}; 432 433/* 434 * mds client state 435 */ 436struct ceph_mds_client { 437 struct ceph_fs_client *fsc; 438 struct mutex mutex; /* all nested structures */ 439 440 struct ceph_mdsmap *mdsmap; 441 struct completion safe_umount_waiters; 442 wait_queue_head_t session_close_wq; 443 struct list_head waiting_for_map; 444 int mdsmap_err; 445 446 struct ceph_mds_session **sessions; /* NULL for mds if no session */ 447 atomic_t num_sessions; 448 int max_sessions; /* len of sessions array */ 449 450 spinlock_t stopping_lock; /* protect snap_empty */ 451 int stopping; /* the stage of shutting down */ 452 atomic_t stopping_blockers; 453 struct completion stopping_waiter; 454 455 atomic64_t quotarealms_count; /* # realms with quota */ 456 /* 457 * We keep a list of inodes we don't see in the mountpoint but that we 458 * need to track quota realms. 459 */ 460 struct rb_root quotarealms_inodes; 461 struct mutex quotarealms_inodes_mutex; 462 463 /* 464 * snap_rwsem will cover cap linkage into snaprealms, and 465 * realm snap contexts. (later, we can do per-realm snap 466 * contexts locks..) the empty list contains realms with no 467 * references (implying they contain no inodes with caps) that 468 * should be destroyed. 469 */ 470 u64 last_snap_seq; 471 struct rw_semaphore snap_rwsem; 472 struct rb_root snap_realms; 473 struct list_head snap_empty; 474 int num_snap_realms; 475 spinlock_t snap_empty_lock; /* protect snap_empty */ 476 477 u64 last_tid; /* most recent mds request */ 478 u64 oldest_tid; /* oldest incomplete mds request, 479 excluding setfilelock requests */ 480 struct rb_root request_tree; /* pending mds requests */ 481 struct delayed_work delayed_work; /* delayed work */ 482 unsigned long last_renew_caps; /* last time we renewed our caps */ 483 struct list_head cap_delay_list; /* caps with delayed release */ 484 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */ 485 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */ 486 struct list_head snap_flush_list; /* cap_snaps ready to flush */ 487 spinlock_t snap_flush_lock; 488 489 u64 last_cap_flush_tid; 490 struct list_head cap_flush_list; 491 struct list_head cap_dirty_migrating; /* ...that are migration... */ 492 int num_cap_flushing; /* # caps we are flushing */ 493 spinlock_t cap_dirty_lock; /* protects above items */ 494 wait_queue_head_t cap_flushing_wq; 495 496 struct work_struct cap_reclaim_work; 497 atomic_t cap_reclaim_pending; 498 499 struct work_struct cap_unlink_work; 500 501 /* 502 * Cap reservations 503 * 504 * Maintain a global pool of preallocated struct ceph_caps, referenced 505 * by struct ceph_caps_reservations. This ensures that we preallocate 506 * memory needed to successfully process an MDS response. (If an MDS 507 * sends us cap information and we fail to process it, we will have 508 * problems due to the client and MDS being out of sync.) 509 * 510 * Reservations are 'owned' by a ceph_cap_reservation context. 511 */ 512 spinlock_t caps_list_lock; 513 struct list_head caps_list; /* unused (reserved or 514 unreserved) */ 515 struct list_head cap_wait_list; 516 int caps_total_count; /* total caps allocated */ 517 int caps_use_count; /* in use */ 518 int caps_use_max; /* max used caps */ 519 int caps_reserve_count; /* unused, reserved */ 520 int caps_avail_count; /* unused, unreserved */ 521 int caps_min_count; /* keep at least this many 522 (unreserved) */ 523 spinlock_t dentry_list_lock; 524 struct list_head dentry_leases; /* fifo list */ 525 struct list_head dentry_dir_leases; /* lru list */ 526 527 struct ceph_client_metric metric; 528 529 spinlock_t snapid_map_lock; 530 struct rb_root snapid_map_tree; 531 struct list_head snapid_map_lru; 532 533 struct rw_semaphore pool_perm_rwsem; 534 struct rb_root pool_perm_tree; 535 536 u32 s_cap_auths_num; 537 struct ceph_mds_cap_auth *s_cap_auths; 538 539 char nodename[__NEW_UTS_LEN + 1]; 540}; 541 542extern const char *ceph_mds_op_name(int op); 543 544extern bool check_session_state(struct ceph_mds_session *s); 545void inc_session_sequence(struct ceph_mds_session *s); 546 547extern struct ceph_mds_session * 548__ceph_lookup_mds_session(struct ceph_mds_client *, int mds); 549 550extern const char *ceph_session_state_name(int s); 551 552extern struct ceph_mds_session * 553ceph_get_mds_session(struct ceph_mds_session *s); 554extern void ceph_put_mds_session(struct ceph_mds_session *s); 555 556extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, 557 struct ceph_msg *msg, int mds); 558 559extern int ceph_mdsc_init(struct ceph_fs_client *fsc); 560extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); 561extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); 562extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); 563 564extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); 565 566extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); 567extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 568 struct inode *dir); 569extern struct ceph_mds_request * 570ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); 571extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, 572 struct inode *dir, 573 struct ceph_mds_request *req); 574int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 575 struct ceph_mds_request *req, 576 ceph_mds_request_wait_callback_t wait_func); 577extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 578 struct inode *dir, 579 struct ceph_mds_request *req); 580extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req); 581extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req); 582static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) 583{ 584 kref_get(&req->r_kref); 585} 586extern void ceph_mdsc_release_request(struct kref *kref); 587static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) 588{ 589 kref_put(&req->r_kref, ceph_mdsc_release_request); 590} 591 592extern void send_flush_mdlog(struct ceph_mds_session *s); 593extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 594 void (*cb)(struct ceph_mds_session *), 595 bool check_state); 596extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq); 597extern void __ceph_queue_cap_release(struct ceph_mds_session *session, 598 struct ceph_cap *cap); 599extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, 600 struct ceph_mds_session *session); 601extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); 602extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr); 603extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc); 604extern int ceph_iterate_session_caps(struct ceph_mds_session *session, 605 int (*cb)(struct inode *, int mds, void *), 606 void *arg); 607extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, 608 int mask); 609 610extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); 611 612static inline void ceph_mdsc_free_path(char *path, int len) 613{ 614 if (!IS_ERR_OR_NULL(path)) 615 __putname(path - (PATH_MAX - 1 - len)); 616} 617 618extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, 619 struct dentry *dentry, int *plen, u64 *base, 620 int for_wire); 621 622extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); 623extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 624 struct dentry *dentry, char action, 625 u32 seq); 626 627extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, 628 struct ceph_msg *msg); 629extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, 630 struct ceph_msg *msg); 631 632extern struct ceph_mds_session * 633ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); 634extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, 635 struct ceph_mds_session *session); 636 637extern int ceph_trim_caps(struct ceph_mds_client *mdsc, 638 struct ceph_mds_session *session, 639 int max_caps); 640 641static inline int ceph_wait_on_async_create(struct inode *inode) 642{ 643 struct ceph_inode_info *ci = ceph_inode(inode); 644 645 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT, 646 TASK_KILLABLE); 647} 648 649extern int ceph_wait_on_conflict_unlink(struct dentry *dentry); 650extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session); 651extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino); 652 653extern bool enable_unsafe_idmap; 654#endif 655