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