1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_INODE_H 7 #define BTRFS_INODE_H 8 9 #include <linux/hash.h> 10 #include <linux/refcount.h> 11 #include <linux/spinlock.h> 12 #include <linux/mutex.h> 13 #include <linux/rwsem.h> 14 #include <linux/fs.h> 15 #include <linux/mm.h> 16 #include <linux/compiler.h> 17 #include <linux/fscrypt.h> 18 #include <linux/lockdep.h> 19 #include <uapi/linux/btrfs_tree.h> 20 #include <trace/events/btrfs.h> 21 #include "ctree.h" 22 #include "block-rsv.h" 23 #include "extent_map.h" 24 #include "extent-io-tree.h" 25 26 struct posix_acl; 27 struct iov_iter; 28 struct writeback_control; 29 struct btrfs_root; 30 struct btrfs_fs_info; 31 struct btrfs_trans_handle; 32 struct btrfs_bio; 33 struct btrfs_file_extent; 34 struct btrfs_delayed_node; 35 36 /* 37 * Since we search a directory based on f_pos (struct dir_context::pos) we have 38 * to start at 2 since '.' and '..' have f_pos of 0 and 1 respectively, so 39 * everybody else has to start at 2 (see btrfs_real_readdir() and dir_emit_dots()). 40 */ 41 #define BTRFS_DIR_START_INDEX 2 42 43 /* 44 * ordered_data_close is set by truncate when a file that used 45 * to have good data has been truncated to zero. When it is set 46 * the btrfs file release call will add this inode to the 47 * ordered operations list so that we make sure to flush out any 48 * new data the application may have written before commit. 49 */ 50 enum { 51 BTRFS_INODE_FLUSH_ON_CLOSE, 52 BTRFS_INODE_DUMMY, 53 BTRFS_INODE_IN_DEFRAG, 54 BTRFS_INODE_HAS_ASYNC_EXTENT, 55 /* 56 * Always set under the VFS' inode lock, otherwise it can cause races 57 * during fsync (we start as a fast fsync and then end up in a full 58 * fsync racing with ordered extent completion). 59 */ 60 BTRFS_INODE_NEEDS_FULL_SYNC, 61 BTRFS_INODE_COPY_EVERYTHING, 62 BTRFS_INODE_HAS_PROPS, 63 BTRFS_INODE_SNAPSHOT_FLUSH, 64 /* 65 * Set and used when logging an inode and it serves to signal that an 66 * inode does not have xattrs, so subsequent fsyncs can avoid searching 67 * for xattrs to log. This bit must be cleared whenever a xattr is added 68 * to an inode. 69 */ 70 BTRFS_INODE_NO_XATTRS, 71 /* 72 * Set when we are in a context where we need to start a transaction and 73 * have dirty pages with the respective file range locked. This is to 74 * ensure that when reserving space for the transaction, if we are low 75 * on available space and need to flush delalloc, we will not flush 76 * delalloc for this inode, because that could result in a deadlock (on 77 * the file range, inode's io_tree). 78 */ 79 BTRFS_INODE_NO_DELALLOC_FLUSH, 80 /* 81 * Set when we are working on enabling verity for a file. Computing and 82 * writing the whole Merkle tree can take a while so we want to prevent 83 * races where two separate tasks attempt to simultaneously start verity 84 * on the same file. 85 */ 86 BTRFS_INODE_VERITY_IN_PROGRESS, 87 /* Set when this inode is a free space inode. */ 88 BTRFS_INODE_FREE_SPACE_INODE, 89 /* Set when there are no capabilities in XATTs for the inode. */ 90 BTRFS_INODE_NO_CAP_XATTR, 91 /* 92 * Set if an error happened when doing a COW write before submitting a 93 * bio or during writeback. Used for both buffered writes and direct IO 94 * writes. This is to signal a fast fsync that it has to wait for 95 * ordered extents to complete and therefore not log extent maps that 96 * point to unwritten extents (when an ordered extent completes and it 97 * has the BTRFS_ORDERED_IOERR flag set, it drops extent maps in its 98 * range). 99 */ 100 BTRFS_INODE_COW_WRITE_ERROR, 101 /* 102 * Indicate this is a directory that points to a subvolume for which 103 * there is no root reference item. That's a case like the following: 104 * 105 * $ btrfs subvolume create /mnt/parent 106 * $ btrfs subvolume create /mnt/parent/child 107 * $ btrfs subvolume snapshot /mnt/parent /mnt/snap 108 * 109 * If subvolume "parent" is root 256, subvolume "child" is root 257 and 110 * snapshot "snap" is root 258, then there's no root reference item (key 111 * BTRFS_ROOT_REF_KEY in the root tree) for the subvolume "child" 112 * associated to root 258 (the snapshot) - there's only for the root 113 * of the "parent" subvolume (root 256). In the chunk root we have a 114 * (256 BTRFS_ROOT_REF_KEY 257) key but we don't have a 115 * (258 BTRFS_ROOT_REF_KEY 257) key - the sames goes for backrefs, we 116 * have a (257 BTRFS_ROOT_BACKREF_KEY 256) but we don't have a 117 * (257 BTRFS_ROOT_BACKREF_KEY 258) key. 118 * 119 * So when opening the "child" dentry from the snapshot's directory, 120 * we don't find a root ref item and we create a stub inode. This is 121 * done at new_simple_dir(), called from btrfs_lookup_dentry(). 122 */ 123 BTRFS_INODE_ROOT_STUB, 124 }; 125 126 /* in memory btrfs inode */ 127 struct btrfs_inode { 128 /* which subvolume this inode belongs to */ 129 struct btrfs_root *root; 130 131 /* Cached value of inode property 'compression'. */ 132 u8 prop_compress; 133 134 /* 135 * Force compression on the file using the defrag ioctl, could be 136 * different from prop_compress and takes precedence if set. 137 */ 138 u8 defrag_compress; 139 s8 defrag_compress_level; 140 141 /* 142 * Lock for counters and all fields used to determine if the inode is in 143 * the log or not (last_trans, last_sub_trans, last_log_commit, 144 * logged_trans), to access/update delalloc_bytes, new_delalloc_bytes, 145 * defrag_bytes, disk_i_size, outstanding_extents, csum_bytes and to 146 * update the VFS' inode number of bytes used. 147 * Also protects setting struct file::private_data. 148 */ 149 spinlock_t lock; 150 151 /* the extent_tree has caches of all the extent mappings to disk */ 152 struct extent_map_tree extent_tree; 153 154 /* the io_tree does range state (DIRTY, LOCKED etc) */ 155 struct extent_io_tree io_tree; 156 157 /* 158 * Keep track of where the inode has extent items mapped in order to 159 * make sure the i_size adjustments are accurate. Not required when the 160 * filesystem is NO_HOLES, the status can't be set while mounted as 161 * it's a mkfs-time feature. 162 */ 163 struct extent_io_tree *file_extent_tree; 164 165 /* held while logging the inode in tree-log.c */ 166 struct mutex log_mutex; 167 168 /* 169 * Counters to keep track of the number of extent item's we may use due 170 * to delalloc and such. outstanding_extents is the number of extent 171 * items we think we'll end up using, and reserved_extents is the number 172 * of extent items we've reserved metadata for. Protected by 'lock'. 173 */ 174 unsigned outstanding_extents; 175 176 /* used to order data wrt metadata */ 177 spinlock_t ordered_tree_lock; 178 struct rb_root ordered_tree; 179 struct rb_node *ordered_tree_last; 180 181 /* list of all the delalloc inodes in the FS. There are times we need 182 * to write all the delalloc pages to disk, and this list is used 183 * to walk them all. 184 */ 185 struct list_head delalloc_inodes; 186 187 unsigned long runtime_flags; 188 189 /* full 64 bit generation number, struct vfs_inode doesn't have a big 190 * enough field for this. 191 */ 192 u64 generation; 193 194 /* 195 * ID of the transaction handle that last modified this inode. 196 * Protected by 'lock'. 197 */ 198 u64 last_trans; 199 200 /* 201 * ID of the transaction that last logged this inode. 202 * Protected by 'lock'. 203 */ 204 u64 logged_trans; 205 206 /* 207 * Log transaction ID when this inode was last modified. 208 * Protected by 'lock'. 209 */ 210 int last_sub_trans; 211 212 /* A local copy of root's last_log_commit. Protected by 'lock'. */ 213 int last_log_commit; 214 215 union { 216 /* 217 * Total number of bytes pending delalloc, used by stat to 218 * calculate the real block usage of the file. This is used 219 * only for files. Protected by 'lock'. 220 */ 221 u64 delalloc_bytes; 222 /* 223 * The lowest possible index of the next dir index key which 224 * points to an inode that needs to be logged. 225 * This is used only for directories. 226 * Use the helpers btrfs_get_first_dir_index_to_log() and 227 * btrfs_set_first_dir_index_to_log() to access this field. 228 */ 229 u64 first_dir_index_to_log; 230 }; 231 232 union { 233 /* 234 * Total number of bytes pending delalloc that fall within a file 235 * range that is either a hole or beyond EOF (and no prealloc extent 236 * exists in the range). This is always <= delalloc_bytes and this 237 * is used only for files. Protected by 'lock'. 238 */ 239 u64 new_delalloc_bytes; 240 /* 241 * The offset of the last dir index key that was logged. 242 * This is used only for directories. Protected by 'log_mutex'. 243 */ 244 u64 last_dir_index_offset; 245 }; 246 247 union { 248 /* 249 * Total number of bytes pending defrag, used by stat to check whether 250 * it needs COW. Protected by 'lock'. 251 * Used by inodes other than the data relocation inode. 252 */ 253 u64 defrag_bytes; 254 255 /* 256 * Logical address of the block group being relocated. 257 * Used only by the data relocation inode. 258 */ 259 u64 reloc_block_group_start; 260 }; 261 262 /* 263 * The size of the file stored in the metadata on disk. data=ordered 264 * means the in-memory i_size might be larger than the size on disk 265 * because not all the blocks are written yet. Protected by 'lock'. 266 */ 267 u64 disk_i_size; 268 269 union { 270 /* 271 * If this is a directory then index_cnt is the counter for the 272 * index number for new files that are created. For an empty 273 * directory, this must be initialized to BTRFS_DIR_START_INDEX. 274 */ 275 u64 index_cnt; 276 277 /* 278 * If this is not a directory, this is the number of bytes 279 * outstanding that are going to need csums. This is used in 280 * ENOSPC accounting. Protected by 'lock'. 281 */ 282 u64 csum_bytes; 283 }; 284 285 /* Cache the directory index number to speed the dir/file remove */ 286 u64 dir_index; 287 288 /* the fsync log has some corner cases that mean we have to check 289 * directories to see if any unlinks have been done before 290 * the directory was logged. See tree-log.c for all the 291 * details 292 */ 293 u64 last_unlink_trans; 294 295 union { 296 /* 297 * The id/generation of the last transaction where this inode 298 * was either the source or the destination of a clone/dedupe 299 * operation. Used when logging an inode to know if there are 300 * shared extents that need special care when logging checksum 301 * items, to avoid duplicate checksum items in a log (which can 302 * lead to a corruption where we end up with missing checksum 303 * ranges after log replay). Protected by the VFS inode lock. 304 * Used for regular files only. 305 */ 306 u64 last_reflink_trans; 307 308 /* 309 * In case this a root stub inode (BTRFS_INODE_ROOT_STUB flag set), 310 * the ID of that root. 311 */ 312 u64 ref_root_id; 313 }; 314 315 /* Backwards incompatible flags, lower half of inode_item::flags */ 316 u32 flags; 317 /* Read-only compatibility flags, upper half of inode_item::flags */ 318 u32 ro_flags; 319 320 struct btrfs_block_rsv block_rsv; 321 322 struct btrfs_delayed_node *delayed_node; 323 324 /* File creation time. */ 325 u64 i_otime_sec; 326 u32 i_otime_nsec; 327 328 /* Hook into fs_info->delayed_iputs */ 329 struct list_head delayed_iput; 330 331 struct rw_semaphore i_mmap_lock; 332 333 struct inode vfs_inode; 334 }; 335 336 static inline u64 btrfs_get_first_dir_index_to_log(const struct btrfs_inode *inode) 337 { 338 return READ_ONCE(inode->first_dir_index_to_log); 339 } 340 341 static inline void btrfs_set_first_dir_index_to_log(struct btrfs_inode *inode, 342 u64 index) 343 { 344 WRITE_ONCE(inode->first_dir_index_to_log, index); 345 } 346 347 /* Type checked and const-preserving VFS inode -> btrfs inode. */ 348 #define BTRFS_I(_inode) \ 349 _Generic(_inode, \ 350 struct inode *: container_of(_inode, struct btrfs_inode, vfs_inode), \ 351 const struct inode *: (const struct btrfs_inode *)container_of( \ 352 _inode, const struct btrfs_inode, vfs_inode)) 353 354 static inline unsigned long btrfs_inode_hash(u64 objectid, 355 const struct btrfs_root *root) 356 { 357 u64 h = objectid ^ (root->root_key.objectid * GOLDEN_RATIO_PRIME); 358 359 #if BITS_PER_LONG == 32 360 h = (h >> 32) ^ (h & 0xffffffff); 361 #endif 362 363 return (unsigned long)h; 364 } 365 366 static inline u64 btrfs_ino(const struct btrfs_inode *inode) 367 { 368 return inode->vfs_inode.i_ino; 369 } 370 371 static inline void btrfs_get_inode_key(const struct btrfs_inode *inode, 372 struct btrfs_key *key) 373 { 374 key->objectid = btrfs_ino(inode); 375 key->type = BTRFS_INODE_ITEM_KEY; 376 key->offset = 0; 377 } 378 379 static inline void btrfs_set_inode_number(struct btrfs_inode *inode, u64 ino) 380 { 381 inode->vfs_inode.i_ino = ino; 382 } 383 384 static inline void btrfs_i_size_write(struct btrfs_inode *inode, u64 size) 385 { 386 i_size_write(&inode->vfs_inode, size); 387 inode->disk_i_size = size; 388 } 389 390 static inline bool btrfs_is_free_space_inode(const struct btrfs_inode *inode) 391 { 392 return test_bit(BTRFS_INODE_FREE_SPACE_INODE, &inode->runtime_flags); 393 } 394 395 static inline bool is_data_inode(const struct btrfs_inode *inode) 396 { 397 return btrfs_ino(inode) != BTRFS_BTREE_INODE_OBJECTID; 398 } 399 400 static inline void btrfs_mod_outstanding_extents(struct btrfs_inode *inode, 401 int mod) 402 { 403 lockdep_assert_held(&inode->lock); 404 inode->outstanding_extents += mod; 405 if (btrfs_is_free_space_inode(inode)) 406 return; 407 trace_btrfs_inode_mod_outstanding_extents(inode->root, btrfs_ino(inode), 408 mod, inode->outstanding_extents); 409 } 410 411 /* 412 * Called every time after doing a buffered, direct IO or memory mapped write. 413 * 414 * This is to ensure that if we write to a file that was previously fsynced in 415 * the current transaction, then try to fsync it again in the same transaction, 416 * we will know that there were changes in the file and that it needs to be 417 * logged. 418 */ 419 static inline void btrfs_set_inode_last_sub_trans(struct btrfs_inode *inode) 420 { 421 spin_lock(&inode->lock); 422 inode->last_sub_trans = inode->root->log_transid; 423 spin_unlock(&inode->lock); 424 } 425 426 /* 427 * Should be called while holding the inode's VFS lock in exclusive mode, or 428 * while holding the inode's mmap lock (struct btrfs_inode::i_mmap_lock) in 429 * either shared or exclusive mode, or in a context where no one else can access 430 * the inode concurrently (during inode creation or when loading an inode from 431 * disk). 432 */ 433 static inline void btrfs_set_inode_full_sync(struct btrfs_inode *inode) 434 { 435 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags); 436 /* 437 * The inode may have been part of a reflink operation in the last 438 * transaction that modified it, and then a fsync has reset the 439 * last_reflink_trans to avoid subsequent fsyncs in the same 440 * transaction to do unnecessary work. So update last_reflink_trans 441 * to the last_trans value (we have to be pessimistic and assume a 442 * reflink happened). 443 * 444 * The ->last_trans is protected by the inode's spinlock and we can 445 * have a concurrent ordered extent completion update it. Also set 446 * last_reflink_trans to ->last_trans only if the former is less than 447 * the later, because we can be called in a context where 448 * last_reflink_trans was set to the current transaction generation 449 * while ->last_trans was not yet updated in the current transaction, 450 * and therefore has a lower value. 451 */ 452 spin_lock(&inode->lock); 453 if (inode->last_reflink_trans < inode->last_trans) 454 inode->last_reflink_trans = inode->last_trans; 455 spin_unlock(&inode->lock); 456 } 457 458 static inline bool btrfs_inode_in_log(struct btrfs_inode *inode, u64 generation) 459 { 460 bool ret = false; 461 462 spin_lock(&inode->lock); 463 if (inode->logged_trans == generation && 464 inode->last_sub_trans <= inode->last_log_commit && 465 inode->last_sub_trans <= btrfs_get_root_last_log_commit(inode->root)) 466 ret = true; 467 spin_unlock(&inode->lock); 468 return ret; 469 } 470 471 /* 472 * Check if the inode has flags compatible with compression 473 */ 474 static inline bool btrfs_inode_can_compress(const struct btrfs_inode *inode) 475 { 476 if (inode->flags & BTRFS_INODE_NODATACOW || 477 inode->flags & BTRFS_INODE_NODATASUM) 478 return false; 479 if (btrfs_is_data_reloc_root(inode->root)) 480 return false; 481 return true; 482 } 483 484 static inline void btrfs_assert_inode_locked(struct btrfs_inode *inode) 485 { 486 /* Immediately trigger a crash if the inode is not locked. */ 487 ASSERT(inode_is_locked(&inode->vfs_inode)); 488 /* Trigger a splat in dmesg if this task is not holding the lock. */ 489 lockdep_assert_held(&inode->vfs_inode.i_rwsem); 490 } 491 492 static inline void btrfs_update_inode_mapping_flags(struct btrfs_inode *inode) 493 { 494 if (inode->flags & BTRFS_INODE_NODATASUM) 495 mapping_clear_stable_writes(inode->vfs_inode.i_mapping); 496 else 497 mapping_set_stable_writes(inode->vfs_inode.i_mapping); 498 } 499 500 static inline void btrfs_set_inode_mapping_order(struct btrfs_inode *inode) 501 { 502 /* Metadata inode should not reach here. */ 503 ASSERT(is_data_inode(inode)); 504 505 mapping_set_folio_order_range(inode->vfs_inode.i_mapping, 506 inode->root->fs_info->block_min_order, 507 inode->root->fs_info->block_max_order); 508 } 509 510 void btrfs_calculate_block_csum_folio(struct btrfs_fs_info *fs_info, 511 const phys_addr_t paddr, u8 *dest); 512 void btrfs_calculate_block_csum_pages(struct btrfs_fs_info *fs_info, 513 const phys_addr_t paddrs[], u8 *dest); 514 int btrfs_check_block_csum(struct btrfs_fs_info *fs_info, phys_addr_t paddr, u8 *csum, 515 const u8 * const csum_expected); 516 bool btrfs_data_csum_ok(struct btrfs_bio *bbio, struct btrfs_device *dev, 517 u32 bio_offset, const phys_addr_t paddrs[]); 518 noinline int can_nocow_extent(struct btrfs_inode *inode, u64 offset, u64 *len, 519 struct btrfs_file_extent *file_extent, 520 bool nowait); 521 522 void btrfs_del_delalloc_inode(struct btrfs_inode *inode); 523 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 524 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index); 525 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 526 struct btrfs_inode *dir, struct btrfs_inode *inode, 527 const struct fscrypt_str *name); 528 int btrfs_add_link(struct btrfs_trans_handle *trans, 529 struct btrfs_inode *parent_inode, struct btrfs_inode *inode, 530 const struct fscrypt_str *name, bool add_backref, u64 index); 531 int btrfs_delete_subvolume(struct btrfs_inode *dir, struct dentry *dentry); 532 int btrfs_truncate_block(struct btrfs_inode *inode, u64 offset, u64 start, u64 end); 533 534 int btrfs_start_delalloc_snapshot(struct btrfs_root *root, bool in_reclaim_context); 535 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, long nr, 536 bool in_reclaim_context); 537 int btrfs_set_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end, 538 unsigned int extra_bits, 539 struct extent_state **cached_state); 540 int btrfs_reset_extent_delalloc(struct btrfs_inode *inode, u64 start, u64 end, 541 unsigned int extra_bits, struct extent_state **cached_state); 542 543 struct btrfs_new_inode_args { 544 /* Input */ 545 struct inode *dir; 546 struct dentry *dentry; 547 struct inode *inode; 548 bool orphan; 549 bool subvol; 550 551 /* Output from btrfs_new_inode_prepare(), input to btrfs_create_new_inode(). */ 552 struct posix_acl *default_acl; 553 struct posix_acl *acl; 554 struct fscrypt_name fname; 555 }; 556 557 int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args, 558 unsigned int *trans_num_items); 559 int btrfs_create_new_inode(struct btrfs_trans_handle *trans, 560 struct btrfs_new_inode_args *args); 561 void btrfs_new_inode_args_destroy(struct btrfs_new_inode_args *args); 562 struct inode *btrfs_new_subvol_inode(struct mnt_idmap *idmap, 563 struct inode *dir); 564 void btrfs_set_delalloc_extent(struct btrfs_inode *inode, struct extent_state *state, 565 u32 bits); 566 void btrfs_clear_delalloc_extent(struct btrfs_inode *inode, 567 struct extent_state *state, u32 bits); 568 void btrfs_merge_delalloc_extent(struct btrfs_inode *inode, struct extent_state *new, 569 struct extent_state *other); 570 void btrfs_split_delalloc_extent(struct btrfs_inode *inode, 571 struct extent_state *orig, u64 split); 572 void btrfs_evict_inode(struct inode *inode); 573 struct inode *btrfs_alloc_inode(struct super_block *sb); 574 void btrfs_destroy_inode(struct inode *inode); 575 void btrfs_free_inode(struct inode *inode); 576 int btrfs_drop_inode(struct inode *inode); 577 int __init btrfs_init_cachep(void); 578 void __cold btrfs_destroy_cachep(void); 579 struct btrfs_inode *btrfs_iget_path(u64 ino, struct btrfs_root *root, 580 struct btrfs_path *path); 581 struct btrfs_inode *btrfs_iget(u64 ino, struct btrfs_root *root); 582 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, 583 struct folio *folio, u64 start, u64 len); 584 int btrfs_update_inode(struct btrfs_trans_handle *trans, 585 struct btrfs_inode *inode); 586 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 587 struct btrfs_inode *inode); 588 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct btrfs_inode *inode); 589 int btrfs_orphan_cleanup(struct btrfs_root *root); 590 int btrfs_cont_expand(struct btrfs_inode *inode, loff_t oldsize, loff_t size); 591 void btrfs_add_delayed_iput(struct btrfs_inode *inode); 592 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info); 593 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info); 594 int btrfs_prealloc_file_range(struct inode *inode, int mode, 595 u64 start, u64 num_bytes, u64 min_size, 596 loff_t actual_len, u64 *alloc_hint); 597 int btrfs_prealloc_file_range_trans(struct inode *inode, 598 struct btrfs_trans_handle *trans, int mode, 599 u64 start, u64 num_bytes, u64 min_size, 600 loff_t actual_len, u64 *alloc_hint); 601 int btrfs_run_delalloc_range(struct btrfs_inode *inode, struct folio *locked_folio, 602 u64 start, u64 end, struct writeback_control *wbc); 603 void btrfs_queue_writepage_fixup(struct btrfs_inode *inode, struct folio *folio); 604 int btrfs_encoded_io_compression_from_extent(struct btrfs_fs_info *fs_info, 605 int compress_type); 606 int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode, 607 u64 disk_bytenr, u64 disk_io_size, 608 struct page **pages, void *uring_ctx); 609 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter, 610 struct btrfs_ioctl_encoded_io_args *encoded, 611 struct extent_state **cached_state, 612 u64 *disk_bytenr, u64 *disk_io_size); 613 ssize_t btrfs_encoded_read_regular(struct kiocb *iocb, struct iov_iter *iter, 614 u64 start, u64 lockend, 615 struct extent_state **cached_state, 616 u64 disk_bytenr, u64 disk_io_size, 617 size_t count, bool compressed, bool *unlocked); 618 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from, 619 const struct btrfs_ioctl_encoded_io_args *encoded); 620 621 struct btrfs_inode *btrfs_find_first_inode(struct btrfs_root *root, u64 min_ino); 622 623 extern const struct dentry_operations btrfs_dentry_operations; 624 625 /* Inode locking type flags, by default the exclusive lock is taken. */ 626 enum btrfs_ilock_type { 627 ENUM_BIT(BTRFS_ILOCK_SHARED), 628 ENUM_BIT(BTRFS_ILOCK_TRY), 629 ENUM_BIT(BTRFS_ILOCK_MMAP), 630 }; 631 632 int btrfs_inode_lock(struct btrfs_inode *inode, unsigned int ilock_flags); 633 void btrfs_inode_unlock(struct btrfs_inode *inode, unsigned int ilock_flags); 634 void btrfs_update_inode_bytes(struct btrfs_inode *inode, const u64 add_bytes, 635 const u64 del_bytes); 636 void btrfs_assert_inode_range_clean(struct btrfs_inode *inode, u64 start, u64 end); 637 u64 btrfs_get_extent_allocation_hint(struct btrfs_inode *inode, u64 start, 638 u64 num_bytes); 639 struct extent_map *btrfs_create_io_em(struct btrfs_inode *inode, u64 start, 640 const struct btrfs_file_extent *file_extent, 641 int type); 642 643 #endif 644