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 #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 89 enum 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 }; 101 102 struct 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 }; 120 121 static inline bool ceph_reset_is_idle(struct ceph_client_reset_state *st) 122 { 123 return READ_ONCE(st->phase) == CEPH_CLIENT_RESET_IDLE; 124 } 125 126 struct 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 }; 135 136 struct 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 */ 146 struct 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 }; 171 172 struct 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 }; 181 182 struct 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 */ 193 struct 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 */ 251 enum { 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 }; 262 263 struct 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 }; 304 305 /* 306 * modes of choosing which MDS to send a request to 307 */ 308 enum { 309 USE_ANY_MDS, 310 USE_RANDOM_MDS, 311 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ 312 }; 313 314 struct ceph_mds_request; 315 struct ceph_mds_client; 316 317 /* 318 * request completion callback 319 */ 320 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, 321 struct ceph_mds_request *req); 322 /* 323 * wait for request completion callback 324 */ 325 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, 326 struct ceph_mds_request *req); 327 328 /* 329 * an in-flight mds request 330 */ 331 struct ceph_mds_request { 332 u64 r_tid; /* transaction id */ 333 struct rb_node r_node; 334 struct ceph_mds_client *r_mdsc; 335 336 struct kref r_kref; 337 int r_op; /* mds op code */ 338 339 /* operation on what? */ 340 struct inode *r_inode; /* arg1 */ 341 struct dentry *r_dentry; /* arg1 */ 342 struct dentry *r_old_dentry; /* arg2: rename from or link from */ 343 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ 344 char *r_path1, *r_path2; 345 struct ceph_vino r_ino1, r_ino2; 346 347 struct inode *r_parent; /* parent dir inode */ 348 struct inode *r_target_inode; /* resulting inode */ 349 struct inode *r_new_inode; /* new inode (for creates) */ 350 351 const struct qstr *r_dname; /* stable name (for ->d_revalidate) */ 352 353 #define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */ 354 #define CEPH_MDS_R_ABORTED (2) /* call was aborted */ 355 #define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */ 356 #define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */ 357 #define CEPH_MDS_R_GOT_RESULT (5) /* got a result */ 358 #define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */ 359 #define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */ 360 #define CEPH_MDS_R_ASYNC (8) /* async request */ 361 #define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */ 362 unsigned long r_req_flags; 363 364 struct mutex r_fill_mutex; 365 366 union ceph_mds_request_args r_args; 367 368 struct ceph_fscrypt_auth *r_fscrypt_auth; 369 u64 r_fscrypt_file; 370 371 u8 *r_altname; /* fscrypt binary crypttext for long filenames */ 372 u32 r_altname_len; /* length of r_altname */ 373 374 int r_fmode; /* file mode, if expecting cap */ 375 int r_request_release_offset; 376 const struct cred *r_cred; 377 struct mnt_idmap *r_mnt_idmap; 378 struct timespec64 r_stamp; 379 380 /* for choosing which mds to send this request to */ 381 int r_direct_mode; 382 u32 r_direct_hash; /* choose dir frag based on this dentry hash */ 383 384 /* data payload is used for xattr ops */ 385 struct ceph_pagelist *r_pagelist; 386 387 /* what caps shall we drop? */ 388 int r_inode_drop, r_inode_unless; 389 int r_dentry_drop, r_dentry_unless; 390 int r_old_dentry_drop, r_old_dentry_unless; 391 struct inode *r_old_inode; 392 int r_old_inode_drop, r_old_inode_unless; 393 394 struct ceph_msg *r_request; /* original request */ 395 struct ceph_msg *r_reply; 396 struct ceph_mds_reply_info_parsed r_reply_info; 397 int r_err; 398 u32 r_readdir_offset; 399 400 struct page *r_locked_page; 401 int r_dir_caps; 402 int r_num_caps; 403 404 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ 405 unsigned long r_started; /* start time to measure timeout against */ 406 unsigned long r_start_latency; /* start time to measure latency */ 407 unsigned long r_end_latency; /* finish time to measure latency */ 408 unsigned long r_request_started; /* start time for mds request only, 409 used to measure lease durations */ 410 411 /* link unsafe requests to parent directory, for fsync */ 412 struct inode *r_unsafe_dir; 413 struct list_head r_unsafe_dir_item; 414 415 /* unsafe requests that modify the target inode */ 416 struct list_head r_unsafe_target_item; 417 418 struct ceph_mds_session *r_session; 419 420 int r_attempts; /* resend attempts */ 421 int r_num_fwd; /* number of forward attempts */ 422 int r_resend_mds; /* mds to resend to next, if any*/ 423 u32 r_sent_on_mseq; /* cap mseq request was sent at*/ 424 u64 r_deleg_ino; 425 426 struct list_head r_wait; 427 struct completion r_completion; 428 struct completion r_safe_completion; 429 ceph_mds_request_callback_t r_callback; 430 struct list_head r_unsafe_item; /* per-session unsafe list item */ 431 432 long long r_dir_release_cnt; 433 long long r_dir_ordered_cnt; 434 int r_readdir_cache_idx; 435 436 int r_feature_needed; 437 438 struct ceph_cap_reservation r_caps_reservation; 439 }; 440 441 struct ceph_pool_perm { 442 struct rb_node node; 443 int perm; 444 s64 pool; 445 size_t pool_ns_len; 446 char pool_ns[]; 447 }; 448 449 struct ceph_snapid_map { 450 struct rb_node node; 451 struct list_head lru; 452 atomic_t ref; 453 dev_t dev; 454 u64 snap; 455 unsigned long last_used; 456 }; 457 458 /* 459 * node for list of quotarealm inodes that are not visible from the filesystem 460 * mountpoint, but required to handle, e.g. quotas. 461 */ 462 struct ceph_quotarealm_inode { 463 struct rb_node node; 464 u64 ino; 465 unsigned long timeout; /* last time a lookup failed for this inode */ 466 struct mutex mutex; 467 struct inode *inode; 468 }; 469 470 #ifdef CONFIG_DEBUG_FS 471 472 struct cap_wait { 473 struct list_head list; 474 u64 ino; 475 pid_t tgid; 476 int need; 477 int want; 478 }; 479 480 #endif 481 482 enum { 483 CEPH_MDSC_STOPPING_BEGIN = 1, 484 CEPH_MDSC_STOPPING_FLUSHING = 2, 485 CEPH_MDSC_STOPPING_FLUSHED = 3, 486 }; 487 488 /* 489 * mds client state 490 */ 491 struct ceph_mds_client { 492 struct ceph_fs_client *fsc; 493 struct mutex mutex; /* all nested structures */ 494 495 struct ceph_mdsmap *mdsmap; 496 struct completion safe_umount_waiters; 497 wait_queue_head_t session_close_wq; 498 struct list_head waiting_for_map; 499 int mdsmap_err; 500 501 struct ceph_mds_session **sessions; /* NULL for mds if no session */ 502 atomic_t num_sessions; 503 int max_sessions; /* len of sessions array */ 504 505 spinlock_t stopping_lock; /* protect snap_empty */ 506 int stopping; /* the stage of shutting down */ 507 atomic_t stopping_blockers; 508 struct completion stopping_waiter; 509 510 atomic64_t dirty_folios; 511 wait_queue_head_t flush_end_wq; 512 513 atomic64_t quotarealms_count; /* # realms with quota */ 514 /* 515 * We keep a list of inodes we don't see in the mountpoint but that we 516 * need to track quota realms. 517 */ 518 struct rb_root quotarealms_inodes; 519 struct mutex quotarealms_inodes_mutex; 520 521 /* 522 * snap_rwsem will cover cap linkage into snaprealms, and 523 * realm snap contexts. (later, we can do per-realm snap 524 * contexts locks..) the empty list contains realms with no 525 * references (implying they contain no inodes with caps) that 526 * should be destroyed. 527 */ 528 u64 last_snap_seq; 529 struct rw_semaphore snap_rwsem; 530 struct rb_root snap_realms; 531 struct list_head snap_empty; 532 int num_snap_realms; 533 spinlock_t snap_empty_lock; /* protect snap_empty */ 534 535 u64 last_tid; /* most recent mds request */ 536 u64 oldest_tid; /* oldest incomplete mds request, 537 excluding setfilelock requests */ 538 struct rb_root request_tree; /* pending mds requests */ 539 struct delayed_work delayed_work; /* delayed work */ 540 unsigned long last_renew_caps; /* last time we renewed our caps */ 541 struct list_head cap_delay_list; /* caps with delayed release */ 542 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */ 543 spinlock_t cap_delay_lock; /* protects cap_delay_list and cap_unlink_delay_list */ 544 struct list_head snap_flush_list; /* cap_snaps ready to flush */ 545 spinlock_t snap_flush_lock; 546 547 u64 last_cap_flush_tid; 548 struct list_head cap_flush_list; 549 struct list_head cap_dirty_migrating; /* ...that are migration... */ 550 int num_cap_flushing; /* # caps we are flushing */ 551 spinlock_t cap_dirty_lock; /* protects above items */ 552 wait_queue_head_t cap_flushing_wq; 553 554 struct work_struct cap_reclaim_work; 555 atomic_t cap_reclaim_pending; 556 557 struct work_struct cap_unlink_work; 558 559 /* 560 * Cap reservations 561 * 562 * Maintain a global pool of preallocated struct ceph_caps, referenced 563 * by struct ceph_caps_reservations. This ensures that we preallocate 564 * memory needed to successfully process an MDS response. (If an MDS 565 * sends us cap information and we fail to process it, we will have 566 * problems due to the client and MDS being out of sync.) 567 * 568 * Reservations are 'owned' by a ceph_cap_reservation context. 569 */ 570 spinlock_t caps_list_lock; 571 struct list_head caps_list; /* unused (reserved or 572 unreserved) */ 573 #ifdef CONFIG_DEBUG_FS 574 struct list_head cap_wait_list; 575 #endif 576 int caps_total_count; /* total caps allocated */ 577 int caps_use_count; /* in use */ 578 int caps_use_max; /* max used caps */ 579 int caps_reserve_count; /* unused, reserved */ 580 int caps_avail_count; /* unused, unreserved */ 581 int caps_min_count; /* keep at least this many 582 (unreserved) */ 583 spinlock_t dentry_list_lock; 584 struct list_head dentry_leases; /* fifo list */ 585 struct list_head dentry_dir_leases; /* lru list */ 586 587 struct ceph_client_metric metric; 588 struct work_struct reset_work; 589 struct ceph_client_reset_state reset_state; 590 struct ceph_subvolume_metrics_tracker subvol_metrics; 591 592 /* Subvolume metrics send tracking */ 593 struct mutex subvol_metrics_last_mutex; 594 struct ceph_subvol_metric_snapshot *subvol_metrics_last; 595 u32 subvol_metrics_last_nr; 596 u64 subvol_metrics_sent; 597 u64 subvol_metrics_nonzero_sends; 598 599 spinlock_t snapid_map_lock; 600 struct rb_root snapid_map_tree; 601 struct list_head snapid_map_lru; 602 603 struct rw_semaphore pool_perm_rwsem; 604 struct rb_root pool_perm_tree; 605 606 u32 s_cap_auths_num; 607 struct ceph_mds_cap_auth *s_cap_auths; 608 609 char nodename[__NEW_UTS_LEN + 1]; 610 }; 611 612 extern const char *ceph_mds_op_name(int op); 613 614 extern bool check_session_state(struct ceph_mds_session *s); 615 void inc_session_sequence(struct ceph_mds_session *s); 616 617 extern struct ceph_mds_session * 618 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); 619 620 extern const char *ceph_session_state_name(int s); 621 extern const char *ceph_reset_phase_name(enum ceph_client_reset_phase phase); 622 623 extern struct ceph_mds_session * 624 ceph_get_mds_session(struct ceph_mds_session *s); 625 extern void ceph_put_mds_session(struct ceph_mds_session *s); 626 int ceph_mdsc_schedule_reset(struct ceph_mds_client *mdsc, 627 const char *reason); 628 int ceph_mdsc_wait_for_reset(struct ceph_mds_client *mdsc); 629 630 extern int ceph_mdsc_init(struct ceph_fs_client *fsc); 631 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); 632 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); 633 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); 634 635 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); 636 637 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); 638 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 639 struct inode *dir); 640 extern struct ceph_mds_request * 641 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); 642 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, 643 struct inode *dir, 644 struct ceph_mds_request *req); 645 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 646 struct ceph_mds_request *req, 647 ceph_mds_request_wait_callback_t wait_func); 648 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 649 struct inode *dir, 650 struct ceph_mds_request *req); 651 extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req); 652 extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req); 653 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) 654 { 655 kref_get(&req->r_kref); 656 } 657 extern void ceph_mdsc_release_request(struct kref *kref); 658 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) 659 { 660 kref_put(&req->r_kref, ceph_mdsc_release_request); 661 } 662 663 extern void send_flush_mdlog(struct ceph_mds_session *s); 664 extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 665 void (*cb)(struct ceph_mds_session *), 666 bool check_state); 667 extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq); 668 extern void __ceph_queue_cap_release(struct ceph_mds_session *session, 669 struct ceph_cap *cap); 670 extern void ceph_flush_session_cap_releases(struct ceph_mds_client *mdsc, 671 struct ceph_mds_session *session); 672 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); 673 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr); 674 extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc); 675 extern int ceph_iterate_session_caps(struct ceph_mds_session *session, 676 int (*cb)(struct inode *, int mds, void *), 677 void *arg); 678 extern int ceph_mds_check_access(struct ceph_mds_client *mdsc, char *tpath, 679 int mask); 680 681 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); 682 683 /* 684 * Structure to group path-related output parameters for build_*_path functions 685 */ 686 struct ceph_path_info { 687 const char *path; 688 int pathlen; 689 struct ceph_vino vino; 690 bool freepath; 691 }; 692 693 static inline void ceph_mdsc_free_path_info(const struct ceph_path_info *path_info) 694 { 695 if (path_info && path_info->freepath && !IS_ERR_OR_NULL(path_info->path)) 696 __putname((char *)path_info->path - (PATH_MAX - 1 - path_info->pathlen)); 697 } 698 699 extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, 700 struct dentry *dentry, struct ceph_path_info *path_info, 701 int for_wire); 702 703 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); 704 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 705 struct dentry *dentry, char action, 706 u32 seq); 707 708 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, 709 struct ceph_msg *msg); 710 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, 711 struct ceph_msg *msg); 712 713 extern struct ceph_mds_session * 714 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); 715 716 extern int ceph_trim_caps(struct ceph_mds_client *mdsc, 717 struct ceph_mds_session *session, 718 int max_caps); 719 720 static inline int ceph_wait_on_async_create(struct inode *inode) 721 { 722 struct ceph_inode_info *ci = ceph_inode(inode); 723 724 return wait_on_bit(&ci->i_ceph_flags, CEPH_I_ASYNC_CREATE_BIT, 725 TASK_KILLABLE); 726 } 727 728 extern int ceph_wait_on_conflict_unlink(struct dentry *dentry); 729 extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session); 730 extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino); 731 732 extern bool enable_unsafe_idmap; 733 #endif 734