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 39 CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_HAS_OWNER_UIDGID, 40 }; 41 42 #define CEPHFS_FEATURES_CLIENT_SUPPORTED { \ 43 0, 1, 2, 3, 4, 5, 6, 7, \ 44 CEPHFS_FEATURE_MIMIC, \ 45 CEPHFS_FEATURE_REPLY_ENCODING, \ 46 CEPHFS_FEATURE_LAZY_CAP_WANTED, \ 47 CEPHFS_FEATURE_MULTI_RECONNECT, \ 48 CEPHFS_FEATURE_DELEG_INO, \ 49 CEPHFS_FEATURE_METRIC_COLLECT, \ 50 CEPHFS_FEATURE_ALTERNATE_NAME, \ 51 CEPHFS_FEATURE_NOTIFY_SESSION_STATE, \ 52 CEPHFS_FEATURE_OP_GETVXATTR, \ 53 CEPHFS_FEATURE_32BITS_RETRY_FWD, \ 54 CEPHFS_FEATURE_HAS_OWNER_UIDGID, \ 55 } 56 57 /* 58 * Some lock dependencies: 59 * 60 * session->s_mutex 61 * mdsc->mutex 62 * 63 * mdsc->snap_rwsem 64 * 65 * ci->i_ceph_lock 66 * mdsc->snap_flush_lock 67 * mdsc->cap_delay_lock 68 * 69 */ 70 71 struct ceph_fs_client; 72 struct ceph_cap; 73 74 /* 75 * parsed info about a single inode. pointers are into the encoded 76 * on-wire structures within the mds reply message payload. 77 */ 78 struct ceph_mds_reply_info_in { 79 struct ceph_mds_reply_inode *in; 80 struct ceph_dir_layout dir_layout; 81 u32 symlink_len; 82 char *symlink; 83 u32 xattr_len; 84 char *xattr_data; 85 u64 inline_version; 86 u32 inline_len; 87 char *inline_data; 88 u32 pool_ns_len; 89 char *pool_ns_data; 90 u64 max_bytes; 91 u64 max_files; 92 s32 dir_pin; 93 struct ceph_timespec btime; 94 struct ceph_timespec snap_btime; 95 u8 *fscrypt_auth; 96 u8 *fscrypt_file; 97 u32 fscrypt_auth_len; 98 u32 fscrypt_file_len; 99 u64 rsnaps; 100 u64 change_attr; 101 }; 102 103 struct ceph_mds_reply_dir_entry { 104 bool is_nokey; 105 char *name; 106 u32 name_len; 107 u32 raw_hash; 108 struct ceph_mds_reply_lease *lease; 109 struct ceph_mds_reply_info_in inode; 110 loff_t offset; 111 }; 112 113 struct ceph_mds_reply_xattr { 114 char *xattr_value; 115 size_t xattr_value_len; 116 }; 117 118 /* 119 * parsed info about an mds reply, including information about 120 * either: 1) the target inode and/or its parent directory and dentry, 121 * and directory contents (for readdir results), or 122 * 2) the file range lock info (for fcntl F_GETLK results). 123 */ 124 struct ceph_mds_reply_info_parsed { 125 struct ceph_mds_reply_head *head; 126 127 /* trace */ 128 struct ceph_mds_reply_info_in diri, targeti; 129 struct ceph_mds_reply_dirfrag *dirfrag; 130 char *dname; 131 u8 *altname; 132 u32 dname_len; 133 u32 altname_len; 134 struct ceph_mds_reply_lease *dlease; 135 struct ceph_mds_reply_xattr xattr_info; 136 137 /* extra */ 138 union { 139 /* for fcntl F_GETLK results */ 140 struct ceph_filelock *filelock_reply; 141 142 /* for readdir results */ 143 struct { 144 struct ceph_mds_reply_dirfrag *dir_dir; 145 size_t dir_buf_size; 146 int dir_nr; 147 bool dir_end; 148 bool dir_complete; 149 bool hash_order; 150 bool offset_hash; 151 struct ceph_mds_reply_dir_entry *dir_entries; 152 }; 153 154 /* for create results */ 155 struct { 156 bool has_create_ino; 157 u64 ino; 158 }; 159 }; 160 161 /* encoded blob describing snapshot contexts for certain 162 operations (e.g., open) */ 163 void *snapblob; 164 int snapblob_len; 165 }; 166 167 168 /* 169 * cap releases are batched and sent to the MDS en masse. 170 * 171 * Account for per-message overhead of mds_cap_release header 172 * and __le32 for osd epoch barrier trailing field. 173 */ 174 #define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \ 175 sizeof(struct ceph_mds_cap_release)) / \ 176 sizeof(struct ceph_mds_cap_item)) 177 178 179 /* 180 * state associated with each MDS<->client session 181 */ 182 enum { 183 CEPH_MDS_SESSION_NEW = 1, 184 CEPH_MDS_SESSION_OPENING = 2, 185 CEPH_MDS_SESSION_OPEN = 3, 186 CEPH_MDS_SESSION_HUNG = 4, 187 CEPH_MDS_SESSION_RESTARTING = 5, 188 CEPH_MDS_SESSION_RECONNECTING = 6, 189 CEPH_MDS_SESSION_CLOSING = 7, 190 CEPH_MDS_SESSION_CLOSED = 8, 191 CEPH_MDS_SESSION_REJECTED = 9, 192 }; 193 194 struct ceph_mds_session { 195 struct ceph_mds_client *s_mdsc; 196 int s_mds; 197 int s_state; 198 unsigned long s_ttl; /* time until mds kills us */ 199 unsigned long s_features; 200 u64 s_seq; /* incoming msg seq # */ 201 struct mutex s_mutex; /* serialize session messages */ 202 203 struct ceph_connection s_con; 204 205 struct ceph_auth_handshake s_auth; 206 207 atomic_t s_cap_gen; /* inc each time we get mds stale msg */ 208 unsigned long s_cap_ttl; /* when session caps expire. protected by s_mutex */ 209 210 /* protected by s_cap_lock */ 211 spinlock_t s_cap_lock; 212 refcount_t s_ref; 213 struct list_head s_caps; /* all caps issued by this session */ 214 struct ceph_cap *s_cap_iterator; 215 int s_nr_caps; 216 int s_num_cap_releases; 217 int s_cap_reconnect; 218 int s_readonly; 219 struct list_head s_cap_releases; /* waiting cap_release messages */ 220 struct work_struct s_cap_release_work; 221 222 /* See ceph_inode_info->i_dirty_item. */ 223 struct list_head s_cap_dirty; /* inodes w/ dirty caps */ 224 225 /* See ceph_inode_info->i_flushing_item. */ 226 struct list_head s_cap_flushing; /* inodes w/ flushing caps */ 227 228 unsigned long s_renew_requested; /* last time we sent a renew req */ 229 u64 s_renew_seq; 230 231 struct list_head s_waiting; /* waiting requests */ 232 struct list_head s_unsafe; /* unsafe requests */ 233 struct xarray s_delegated_inos; 234 }; 235 236 /* 237 * modes of choosing which MDS to send a request to 238 */ 239 enum { 240 USE_ANY_MDS, 241 USE_RANDOM_MDS, 242 USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ 243 }; 244 245 struct ceph_mds_request; 246 struct ceph_mds_client; 247 248 /* 249 * request completion callback 250 */ 251 typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, 252 struct ceph_mds_request *req); 253 /* 254 * wait for request completion callback 255 */ 256 typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, 257 struct ceph_mds_request *req); 258 259 /* 260 * an in-flight mds request 261 */ 262 struct ceph_mds_request { 263 u64 r_tid; /* transaction id */ 264 struct rb_node r_node; 265 struct ceph_mds_client *r_mdsc; 266 267 struct kref r_kref; 268 int r_op; /* mds op code */ 269 270 /* operation on what? */ 271 struct inode *r_inode; /* arg1 */ 272 struct dentry *r_dentry; /* arg1 */ 273 struct dentry *r_old_dentry; /* arg2: rename from or link from */ 274 struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ 275 char *r_path1, *r_path2; 276 struct ceph_vino r_ino1, r_ino2; 277 278 struct inode *r_parent; /* parent dir inode */ 279 struct inode *r_target_inode; /* resulting inode */ 280 struct inode *r_new_inode; /* new inode (for creates) */ 281 282 #define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */ 283 #define CEPH_MDS_R_ABORTED (2) /* call was aborted */ 284 #define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */ 285 #define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */ 286 #define CEPH_MDS_R_GOT_RESULT (5) /* got a result */ 287 #define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */ 288 #define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */ 289 #define CEPH_MDS_R_ASYNC (8) /* async request */ 290 #define CEPH_MDS_R_FSCRYPT_FILE (9) /* must marshal fscrypt_file field */ 291 unsigned long r_req_flags; 292 293 struct mutex r_fill_mutex; 294 295 union ceph_mds_request_args r_args; 296 297 struct ceph_fscrypt_auth *r_fscrypt_auth; 298 u64 r_fscrypt_file; 299 300 u8 *r_altname; /* fscrypt binary crypttext for long filenames */ 301 u32 r_altname_len; /* length of r_altname */ 302 303 int r_fmode; /* file mode, if expecting cap */ 304 int r_request_release_offset; 305 const struct cred *r_cred; 306 struct mnt_idmap *r_mnt_idmap; 307 struct timespec64 r_stamp; 308 309 /* for choosing which mds to send this request to */ 310 int r_direct_mode; 311 u32 r_direct_hash; /* choose dir frag based on this dentry hash */ 312 313 /* data payload is used for xattr ops */ 314 struct ceph_pagelist *r_pagelist; 315 316 /* what caps shall we drop? */ 317 int r_inode_drop, r_inode_unless; 318 int r_dentry_drop, r_dentry_unless; 319 int r_old_dentry_drop, r_old_dentry_unless; 320 struct inode *r_old_inode; 321 int r_old_inode_drop, r_old_inode_unless; 322 323 struct ceph_msg *r_request; /* original request */ 324 struct ceph_msg *r_reply; 325 struct ceph_mds_reply_info_parsed r_reply_info; 326 int r_err; 327 u32 r_readdir_offset; 328 329 struct page *r_locked_page; 330 int r_dir_caps; 331 int r_num_caps; 332 333 unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ 334 unsigned long r_started; /* start time to measure timeout against */ 335 unsigned long r_start_latency; /* start time to measure latency */ 336 unsigned long r_end_latency; /* finish time to measure latency */ 337 unsigned long r_request_started; /* start time for mds request only, 338 used to measure lease durations */ 339 340 /* link unsafe requests to parent directory, for fsync */ 341 struct inode *r_unsafe_dir; 342 struct list_head r_unsafe_dir_item; 343 344 /* unsafe requests that modify the target inode */ 345 struct list_head r_unsafe_target_item; 346 347 struct ceph_mds_session *r_session; 348 349 int r_attempts; /* resend attempts */ 350 int r_num_fwd; /* number of forward attempts */ 351 int r_resend_mds; /* mds to resend to next, if any*/ 352 u32 r_sent_on_mseq; /* cap mseq request was sent at*/ 353 u64 r_deleg_ino; 354 355 struct list_head r_wait; 356 struct completion r_completion; 357 struct completion r_safe_completion; 358 ceph_mds_request_callback_t r_callback; 359 struct list_head r_unsafe_item; /* per-session unsafe list item */ 360 361 long long r_dir_release_cnt; 362 long long r_dir_ordered_cnt; 363 int r_readdir_cache_idx; 364 365 int r_feature_needed; 366 367 struct ceph_cap_reservation r_caps_reservation; 368 }; 369 370 struct ceph_pool_perm { 371 struct rb_node node; 372 int perm; 373 s64 pool; 374 size_t pool_ns_len; 375 char pool_ns[]; 376 }; 377 378 struct ceph_snapid_map { 379 struct rb_node node; 380 struct list_head lru; 381 atomic_t ref; 382 dev_t dev; 383 u64 snap; 384 unsigned long last_used; 385 }; 386 387 /* 388 * node for list of quotarealm inodes that are not visible from the filesystem 389 * mountpoint, but required to handle, e.g. quotas. 390 */ 391 struct ceph_quotarealm_inode { 392 struct rb_node node; 393 u64 ino; 394 unsigned long timeout; /* last time a lookup failed for this inode */ 395 struct mutex mutex; 396 struct inode *inode; 397 }; 398 399 struct cap_wait { 400 struct list_head list; 401 u64 ino; 402 pid_t tgid; 403 int need; 404 int want; 405 }; 406 407 enum { 408 CEPH_MDSC_STOPPING_BEGIN = 1, 409 CEPH_MDSC_STOPPING_FLUSHING = 2, 410 CEPH_MDSC_STOPPING_FLUSHED = 3, 411 }; 412 413 /* 414 * mds client state 415 */ 416 struct ceph_mds_client { 417 struct ceph_fs_client *fsc; 418 struct mutex mutex; /* all nested structures */ 419 420 struct ceph_mdsmap *mdsmap; 421 struct completion safe_umount_waiters; 422 wait_queue_head_t session_close_wq; 423 struct list_head waiting_for_map; 424 int mdsmap_err; 425 426 struct ceph_mds_session **sessions; /* NULL for mds if no session */ 427 atomic_t num_sessions; 428 int max_sessions; /* len of sessions array */ 429 430 spinlock_t stopping_lock; /* protect snap_empty */ 431 int stopping; /* the stage of shutting down */ 432 atomic_t stopping_blockers; 433 struct completion stopping_waiter; 434 435 atomic64_t quotarealms_count; /* # realms with quota */ 436 /* 437 * We keep a list of inodes we don't see in the mountpoint but that we 438 * need to track quota realms. 439 */ 440 struct rb_root quotarealms_inodes; 441 struct mutex quotarealms_inodes_mutex; 442 443 /* 444 * snap_rwsem will cover cap linkage into snaprealms, and 445 * realm snap contexts. (later, we can do per-realm snap 446 * contexts locks..) the empty list contains realms with no 447 * references (implying they contain no inodes with caps) that 448 * should be destroyed. 449 */ 450 u64 last_snap_seq; 451 struct rw_semaphore snap_rwsem; 452 struct rb_root snap_realms; 453 struct list_head snap_empty; 454 int num_snap_realms; 455 spinlock_t snap_empty_lock; /* protect snap_empty */ 456 457 u64 last_tid; /* most recent mds request */ 458 u64 oldest_tid; /* oldest incomplete mds request, 459 excluding setfilelock requests */ 460 struct rb_root request_tree; /* pending mds requests */ 461 struct delayed_work delayed_work; /* delayed work */ 462 unsigned long last_renew_caps; /* last time we renewed our caps */ 463 struct list_head cap_delay_list; /* caps with delayed release */ 464 spinlock_t cap_delay_lock; /* protects cap_delay_list */ 465 struct list_head cap_unlink_delay_list; /* caps with delayed release for unlink */ 466 spinlock_t cap_unlink_delay_lock; /* protects cap_unlink_delay_list */ 467 struct list_head snap_flush_list; /* cap_snaps ready to flush */ 468 spinlock_t snap_flush_lock; 469 470 u64 last_cap_flush_tid; 471 struct list_head cap_flush_list; 472 struct list_head cap_dirty_migrating; /* ...that are migration... */ 473 int num_cap_flushing; /* # caps we are flushing */ 474 spinlock_t cap_dirty_lock; /* protects above items */ 475 wait_queue_head_t cap_flushing_wq; 476 477 struct work_struct cap_reclaim_work; 478 atomic_t cap_reclaim_pending; 479 480 struct work_struct cap_unlink_work; 481 482 /* 483 * Cap reservations 484 * 485 * Maintain a global pool of preallocated struct ceph_caps, referenced 486 * by struct ceph_caps_reservations. This ensures that we preallocate 487 * memory needed to successfully process an MDS response. (If an MDS 488 * sends us cap information and we fail to process it, we will have 489 * problems due to the client and MDS being out of sync.) 490 * 491 * Reservations are 'owned' by a ceph_cap_reservation context. 492 */ 493 spinlock_t caps_list_lock; 494 struct list_head caps_list; /* unused (reserved or 495 unreserved) */ 496 struct list_head cap_wait_list; 497 int caps_total_count; /* total caps allocated */ 498 int caps_use_count; /* in use */ 499 int caps_use_max; /* max used caps */ 500 int caps_reserve_count; /* unused, reserved */ 501 int caps_avail_count; /* unused, unreserved */ 502 int caps_min_count; /* keep at least this many 503 (unreserved) */ 504 spinlock_t dentry_list_lock; 505 struct list_head dentry_leases; /* fifo list */ 506 struct list_head dentry_dir_leases; /* lru list */ 507 508 struct ceph_client_metric metric; 509 510 spinlock_t snapid_map_lock; 511 struct rb_root snapid_map_tree; 512 struct list_head snapid_map_lru; 513 514 struct rw_semaphore pool_perm_rwsem; 515 struct rb_root pool_perm_tree; 516 517 char nodename[__NEW_UTS_LEN + 1]; 518 }; 519 520 extern const char *ceph_mds_op_name(int op); 521 522 extern bool check_session_state(struct ceph_mds_session *s); 523 void inc_session_sequence(struct ceph_mds_session *s); 524 525 extern struct ceph_mds_session * 526 __ceph_lookup_mds_session(struct ceph_mds_client *, int mds); 527 528 extern const char *ceph_session_state_name(int s); 529 530 extern struct ceph_mds_session * 531 ceph_get_mds_session(struct ceph_mds_session *s); 532 extern void ceph_put_mds_session(struct ceph_mds_session *s); 533 534 extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, 535 struct ceph_msg *msg, int mds); 536 537 extern int ceph_mdsc_init(struct ceph_fs_client *fsc); 538 extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); 539 extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); 540 extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); 541 542 extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); 543 544 extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); 545 extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, 546 struct inode *dir); 547 extern struct ceph_mds_request * 548 ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); 549 extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, 550 struct inode *dir, 551 struct ceph_mds_request *req); 552 int ceph_mdsc_wait_request(struct ceph_mds_client *mdsc, 553 struct ceph_mds_request *req, 554 ceph_mds_request_wait_callback_t wait_func); 555 extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, 556 struct inode *dir, 557 struct ceph_mds_request *req); 558 extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req); 559 extern void ceph_mdsc_release_dir_caps_async(struct ceph_mds_request *req); 560 static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) 561 { 562 kref_get(&req->r_kref); 563 } 564 extern void ceph_mdsc_release_request(struct kref *kref); 565 static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) 566 { 567 kref_put(&req->r_kref, ceph_mdsc_release_request); 568 } 569 570 extern void send_flush_mdlog(struct ceph_mds_session *s); 571 extern void ceph_mdsc_iterate_sessions(struct ceph_mds_client *mdsc, 572 void (*cb)(struct ceph_mds_session *), 573 bool check_state); 574 extern struct ceph_msg *ceph_create_session_msg(u32 op, u64 seq); 575 extern void __ceph_queue_cap_release(struct ceph_mds_session *session, 576 struct ceph_cap *cap); 577 extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, 578 struct ceph_mds_session *session); 579 extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); 580 extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr); 581 extern void ceph_queue_cap_unlink_work(struct ceph_mds_client *mdsc); 582 extern int ceph_iterate_session_caps(struct ceph_mds_session *session, 583 int (*cb)(struct inode *, int mds, void *), 584 void *arg); 585 extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); 586 587 static inline void ceph_mdsc_free_path(char *path, int len) 588 { 589 if (!IS_ERR_OR_NULL(path)) 590 __putname(path - (PATH_MAX - 1 - len)); 591 } 592 593 extern char *ceph_mdsc_build_path(struct ceph_mds_client *mdsc, 594 struct dentry *dentry, int *plen, u64 *base, 595 int for_wire); 596 597 extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); 598 extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, 599 struct dentry *dentry, char action, 600 u32 seq); 601 602 extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, 603 struct ceph_msg *msg); 604 extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, 605 struct ceph_msg *msg); 606 607 extern struct ceph_mds_session * 608 ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); 609 extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, 610 struct ceph_mds_session *session); 611 612 extern int ceph_trim_caps(struct ceph_mds_client *mdsc, 613 struct ceph_mds_session *session, 614 int max_caps); 615 616 static inline int ceph_wait_on_async_create(struct inode *inode) 617 { 618 struct ceph_inode_info *ci = ceph_inode(inode); 619 620 return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT, 621 TASK_KILLABLE); 622 } 623 624 extern int ceph_wait_on_conflict_unlink(struct dentry *dentry); 625 extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session); 626 extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino); 627 628 extern bool enable_unsafe_idmap; 629 #endif 630