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 dirty_folios; 462 wait_queue_head_t flush_end_wq; 463 464 atomic64_t quotarealms_count; /* # realms with quota */ 465 /* 466 * We keep a list of inodes we don't see in the mountpoint but that we 467 * need to track quota realms. 468 */ 469 struct rb_root quotarealms_inodes; 470 struct mutex quotarealms_inodes_mutex; 471 472 /* 473 * snap_rwsem will cover cap linkage into snaprealms, and 474 * realm snap contexts. (later, we can do per-realm snap 475 * contexts locks..) the empty list contains realms with no 476 * references (implying they contain no inodes with caps) that 477 * should be destroyed. 478 */ 479 u64 last_snap_seq; 480 struct rw_semaphore snap_rwsem; 481 struct rb_root snap_realms; 482 struct list_head snap_empty; 483 int num_snap_realms; 484 spinlock_t snap_empty_lock; /* protect snap_empty */ 485 486 u64 last_tid; /* most recent mds request */ 487 u64 oldest_tid; /* oldest incomplete mds request, 488 excluding setfilelock requests */ 489 struct rb_root request_tree; /* pending mds requests */ 490 struct delayed_work delayed_work; /* delayed work */ 491 unsigned long last_renew_caps; /* last time we renewed our caps */ 492 struct list_head cap_delay_list; /* caps with delayed release */ 493 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */ 494 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */ 495 struct list_head snap_flush_list; /* cap_snaps ready to flush */ 496 spinlock_t snap_flush_lock; 497 498 u64 last_cap_flush_tid; 499 struct list_head cap_flush_list; 500 struct list_head cap_dirty_migrating; /* ...that are migration... */ 501 int num_cap_flushing; /* # caps we are flushing */ 502 spinlock_t cap_dirty_lock; /* protects above items */ 503 wait_queue_head_t cap_flushing_wq; 504 505 struct work_struct cap_reclaim_work; 506 atomic_t cap_reclaim_pending; 507 508 struct work_struct cap_unlink_work; 509 510 /* 511 * Cap reservations 512 * 513 * Maintain a global pool of preallocated struct ceph_caps, referenced 514 * by struct ceph_caps_reservations. This ensures that we preallocate 515 * memory needed to successfully process an MDS response. (If an MDS 516 * sends us cap information and we fail to process it, we will have 517 * problems due to the client and MDS being out of sync.) 518 * 519 * Reservations are 'owned' by a ceph_cap_reservation context. 520 */ 521 spinlock_t caps_list_lock; 522 struct list_head caps_list; /* unused (reserved or 523 unreserved) */ 524 #ifdef CONFIG_DEBUG_FS 525 struct list_head cap_wait_list; 526 #endif 527 int caps_total_count; /* total caps allocated */ 528 int caps_use_count; /* in use */ 529 int caps_use_max; /* max used caps */ 530 int caps_reserve_count; /* unused, reserved */ 531 int caps_avail_count; /* unused, unreserved */ 532 int caps_min_count; /* keep at least this many 533 (unreserved) */ 534 spinlock_t dentry_list_lock; 535 struct list_head dentry_leases; /* fifo list */ 536 struct list_head dentry_dir_leases; /* lru list */ 537 538 struct ceph_client_metric metric; 539 540 spinlock_t snapid_map_lock; 541 struct rb_root snapid_map_tree; 542 struct list_head snapid_map_lru; 543 544 struct rw_semaphore pool_perm_rwsem; 545 struct rb_root pool_perm_tree; 546 547 u32 s_cap_auths_num; 548 struct ceph_mds_cap_auth *s_cap_auths; 549 550 char nodename[__NEW_UTS_LEN + 1]; 551 }; 552 553 extern const char *ceph_mds_op_name(int op); 554 555 extern bool check_session_state(struct ceph_mds_session *s); 556 void inc_session_sequence(struct ceph_mds_session *s); 557 558 extern struct ceph_mds_session * 559 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); 560 561 extern const char *ceph_session_state_name(int s); 562 563 extern struct ceph_mds_session * 564 ceph_get_mds_session(struct ceph_mds_session *s); 565 extern void ceph_put_mds_session(struct ceph_mds_session *s); 566 567 extern int ceph_mdsc_init(struct ceph_fs_client *fsc); 568 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); 569 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); 570 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); 571 572 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); 573 574 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); 575 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 576 struct inode *dir); 577 extern struct ceph_mds_request * 578 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); 579 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, 580 struct inode *dir, 581 struct ceph_mds_request *req); 582 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 583 struct ceph_mds_request *req, 584 ceph_mds_request_wait_callback_t wait_func); 585 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 586 struct inode *dir, 587 struct ceph_mds_request *req); 588 extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req); 589 extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req); 590 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) 591 { 592 kref_get(&req->r_kref); 593 } 594 extern void ceph_mdsc_release_request(struct kref *kref); 595 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) 596 { 597 kref_put(&req->r_kref, ceph_mdsc_release_request); 598 } 599 600 extern void send_flush_mdlog(struct ceph_mds_session *s); 601 extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 602 void (*cb)(struct ceph_mds_session *), 603 bool check_state); 604 extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq); 605 extern void __ceph_queue_cap_release(struct ceph_mds_session *session, 606 struct ceph_cap *cap); 607 extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc, 608 struct ceph_mds_session *session); 609 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); 610 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr); 611 extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc); 612 extern int ceph_iterate_session_caps(struct ceph_mds_session *session, 613 int (*cb)(struct inode *, int mds, void *), 614 void *arg); 615 extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, 616 int mask); 617 618 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); 619 620 static inline void ceph_mdsc_free_path(char *path, int len) 621 { 622 if (!IS_ERR_OR_NULL(path)) 623 __putname(path - (PATH_MAX - 1 - len)); 624 } 625 626 extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, 627 struct dentry *dentry, int *plen, u64 *base, 628 int for_wire); 629 630 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); 631 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 632 struct dentry *dentry, char action, 633 u32 seq); 634 635 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, 636 struct ceph_msg *msg); 637 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, 638 struct ceph_msg *msg); 639 640 extern struct ceph_mds_session * 641 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); 642 643 extern int ceph_trim_caps(struct ceph_mds_client *mdsc, 644 struct ceph_mds_session *session, 645 int max_caps); 646 647 static inline int ceph_wait_on_async_create(struct inode *inode) 648 { 649 struct ceph_inode_info *ci = ceph_inode(inode); 650 651 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT, 652 TASK_KILLABLE); 653 } 654 655 extern int ceph_wait_on_conflict_unlink(struct dentry *dentry); 656 extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session); 657 extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino); 658 659 extern bool enable_unsafe_idmap; 660 #endif 661