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