1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2007 Oracle. All rights reserved. 4 */ 5 6 #ifndef BTRFS_CTREE_H 7 #define BTRFS_CTREE_H 8 9 #include <linux/mm.h> 10 #include <linux/sched/signal.h> 11 #include <linux/highmem.h> 12 #include <linux/fs.h> 13 #include <linux/rwsem.h> 14 #include <linux/semaphore.h> 15 #include <linux/completion.h> 16 #include <linux/backing-dev.h> 17 #include <linux/wait.h> 18 #include <linux/slab.h> 19 #include <trace/events/btrfs.h> 20 #include <asm/kmap_types.h> 21 #include <asm/unaligned.h> 22 #include <linux/pagemap.h> 23 #include <linux/btrfs.h> 24 #include <linux/btrfs_tree.h> 25 #include <linux/workqueue.h> 26 #include <linux/security.h> 27 #include <linux/sizes.h> 28 #include <linux/dynamic_debug.h> 29 #include <linux/refcount.h> 30 #include <linux/crc32c.h> 31 #include "extent-io-tree.h" 32 #include "extent_io.h" 33 #include "extent_map.h" 34 #include "async-thread.h" 35 #include "block-rsv.h" 36 #include "locking.h" 37 38 struct btrfs_trans_handle; 39 struct btrfs_transaction; 40 struct btrfs_pending_snapshot; 41 struct btrfs_delayed_ref_root; 42 struct btrfs_space_info; 43 struct btrfs_block_group; 44 extern struct kmem_cache *btrfs_trans_handle_cachep; 45 extern struct kmem_cache *btrfs_bit_radix_cachep; 46 extern struct kmem_cache *btrfs_path_cachep; 47 extern struct kmem_cache *btrfs_free_space_cachep; 48 extern struct kmem_cache *btrfs_free_space_bitmap_cachep; 49 struct btrfs_ordered_sum; 50 struct btrfs_ref; 51 52 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */ 53 54 /* 55 * Maximum number of mirrors that can be available for all profiles counting 56 * the target device of dev-replace as one. During an active device replace 57 * procedure, the target device of the copy operation is a mirror for the 58 * filesystem data as well that can be used to read data in order to repair 59 * read errors on other disks. 60 * 61 * Current value is derived from RAID1C4 with 4 copies. 62 */ 63 #define BTRFS_MAX_MIRRORS (4 + 1) 64 65 #define BTRFS_MAX_LEVEL 8 66 67 #define BTRFS_OLDEST_GENERATION 0ULL 68 69 /* 70 * the max metadata block size. This limit is somewhat artificial, 71 * but the memmove costs go through the roof for larger blocks. 72 */ 73 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536 74 75 /* 76 * we can actually store much bigger names, but lets not confuse the rest 77 * of linux 78 */ 79 #define BTRFS_NAME_LEN 255 80 81 /* 82 * Theoretical limit is larger, but we keep this down to a sane 83 * value. That should limit greatly the possibility of collisions on 84 * inode ref items. 85 */ 86 #define BTRFS_LINK_MAX 65535U 87 88 #define BTRFS_EMPTY_DIR_SIZE 0 89 90 /* ioprio of readahead is set to idle */ 91 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) 92 93 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M 94 95 /* 96 * Use large batch size to reduce overhead of metadata updates. On the reader 97 * side, we only read it when we are close to ENOSPC and the read overhead is 98 * mostly related to the number of CPUs, so it is OK to use arbitrary large 99 * value here. 100 */ 101 #define BTRFS_TOTAL_BYTES_PINNED_BATCH SZ_128M 102 103 #define BTRFS_MAX_EXTENT_SIZE SZ_128M 104 105 /* 106 * Deltas are an effective way to populate global statistics. Give macro names 107 * to make it clear what we're doing. An example is discard_extents in 108 * btrfs_free_space_ctl. 109 */ 110 #define BTRFS_STAT_NR_ENTRIES 2 111 #define BTRFS_STAT_CURR 0 112 #define BTRFS_STAT_PREV 1 113 114 /* 115 * Count how many BTRFS_MAX_EXTENT_SIZE cover the @size 116 */ 117 static inline u32 count_max_extents(u64 size) 118 { 119 return div_u64(size + BTRFS_MAX_EXTENT_SIZE - 1, BTRFS_MAX_EXTENT_SIZE); 120 } 121 122 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 123 { 124 BUG_ON(num_stripes == 0); 125 return sizeof(struct btrfs_chunk) + 126 sizeof(struct btrfs_stripe) * (num_stripes - 1); 127 } 128 129 /* 130 * Runtime (in-memory) states of filesystem 131 */ 132 enum { 133 /* Global indicator of serious filesystem errors */ 134 BTRFS_FS_STATE_ERROR, 135 /* 136 * Filesystem is being remounted, allow to skip some operations, like 137 * defrag 138 */ 139 BTRFS_FS_STATE_REMOUNTING, 140 /* Track if a transaction abort has been reported on this filesystem */ 141 BTRFS_FS_STATE_TRANS_ABORTED, 142 /* 143 * Bio operations should be blocked on this filesystem because a source 144 * or target device is being destroyed as part of a device replace 145 */ 146 BTRFS_FS_STATE_DEV_REPLACING, 147 /* The btrfs_fs_info created for self-tests */ 148 BTRFS_FS_STATE_DUMMY_FS_INFO, 149 }; 150 151 #define BTRFS_BACKREF_REV_MAX 256 152 #define BTRFS_BACKREF_REV_SHIFT 56 153 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 154 BTRFS_BACKREF_REV_SHIFT) 155 156 #define BTRFS_OLD_BACKREF_REV 0 157 #define BTRFS_MIXED_BACKREF_REV 1 158 159 /* 160 * every tree block (leaf or node) starts with this header. 161 */ 162 struct btrfs_header { 163 /* these first four must match the super block */ 164 u8 csum[BTRFS_CSUM_SIZE]; 165 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 166 __le64 bytenr; /* which block this node is supposed to live in */ 167 __le64 flags; 168 169 /* allowed to be different from the super from here on down */ 170 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 171 __le64 generation; 172 __le64 owner; 173 __le32 nritems; 174 u8 level; 175 } __attribute__ ((__packed__)); 176 177 /* 178 * this is a very generous portion of the super block, giving us 179 * room to translate 14 chunks with 3 stripes each. 180 */ 181 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 182 183 /* 184 * just in case we somehow lose the roots and are not able to mount, 185 * we store an array of the roots from previous transactions 186 * in the super. 187 */ 188 #define BTRFS_NUM_BACKUP_ROOTS 4 189 struct btrfs_root_backup { 190 __le64 tree_root; 191 __le64 tree_root_gen; 192 193 __le64 chunk_root; 194 __le64 chunk_root_gen; 195 196 __le64 extent_root; 197 __le64 extent_root_gen; 198 199 __le64 fs_root; 200 __le64 fs_root_gen; 201 202 __le64 dev_root; 203 __le64 dev_root_gen; 204 205 __le64 csum_root; 206 __le64 csum_root_gen; 207 208 __le64 total_bytes; 209 __le64 bytes_used; 210 __le64 num_devices; 211 /* future */ 212 __le64 unused_64[4]; 213 214 u8 tree_root_level; 215 u8 chunk_root_level; 216 u8 extent_root_level; 217 u8 fs_root_level; 218 u8 dev_root_level; 219 u8 csum_root_level; 220 /* future and to align */ 221 u8 unused_8[10]; 222 } __attribute__ ((__packed__)); 223 224 /* 225 * the super block basically lists the main trees of the FS 226 * it currently lacks any block count etc etc 227 */ 228 struct btrfs_super_block { 229 /* the first 4 fields must match struct btrfs_header */ 230 u8 csum[BTRFS_CSUM_SIZE]; 231 /* FS specific UUID, visible to user */ 232 u8 fsid[BTRFS_FSID_SIZE]; 233 __le64 bytenr; /* this block number */ 234 __le64 flags; 235 236 /* allowed to be different from the btrfs_header from here own down */ 237 __le64 magic; 238 __le64 generation; 239 __le64 root; 240 __le64 chunk_root; 241 __le64 log_root; 242 243 /* this will help find the new super based on the log root */ 244 __le64 log_root_transid; 245 __le64 total_bytes; 246 __le64 bytes_used; 247 __le64 root_dir_objectid; 248 __le64 num_devices; 249 __le32 sectorsize; 250 __le32 nodesize; 251 __le32 __unused_leafsize; 252 __le32 stripesize; 253 __le32 sys_chunk_array_size; 254 __le64 chunk_root_generation; 255 __le64 compat_flags; 256 __le64 compat_ro_flags; 257 __le64 incompat_flags; 258 __le16 csum_type; 259 u8 root_level; 260 u8 chunk_root_level; 261 u8 log_root_level; 262 struct btrfs_dev_item dev_item; 263 264 char label[BTRFS_LABEL_SIZE]; 265 266 __le64 cache_generation; 267 __le64 uuid_tree_generation; 268 269 /* the UUID written into btree blocks */ 270 u8 metadata_uuid[BTRFS_FSID_SIZE]; 271 272 /* future expansion */ 273 __le64 reserved[28]; 274 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 275 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; 276 } __attribute__ ((__packed__)); 277 278 /* 279 * Compat flags that we support. If any incompat flags are set other than the 280 * ones specified below then we will fail to mount 281 */ 282 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 283 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL 284 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL 285 286 #define BTRFS_FEATURE_COMPAT_RO_SUPP \ 287 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \ 288 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID) 289 290 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL 291 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL 292 293 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 294 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 295 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 296 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 297 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ 298 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ 299 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD | \ 300 BTRFS_FEATURE_INCOMPAT_RAID56 | \ 301 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ 302 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ 303 BTRFS_FEATURE_INCOMPAT_NO_HOLES | \ 304 BTRFS_FEATURE_INCOMPAT_METADATA_UUID | \ 305 BTRFS_FEATURE_INCOMPAT_RAID1C34) 306 307 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \ 308 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) 309 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL 310 311 /* 312 * A leaf is full of items. offset and size tell us where to find 313 * the item in the leaf (relative to the start of the data area) 314 */ 315 struct btrfs_item { 316 struct btrfs_disk_key key; 317 __le32 offset; 318 __le32 size; 319 } __attribute__ ((__packed__)); 320 321 /* 322 * leaves have an item area and a data area: 323 * [item0, item1....itemN] [free space] [dataN...data1, data0] 324 * 325 * The data is separate from the items to get the keys closer together 326 * during searches. 327 */ 328 struct btrfs_leaf { 329 struct btrfs_header header; 330 struct btrfs_item items[]; 331 } __attribute__ ((__packed__)); 332 333 /* 334 * all non-leaf blocks are nodes, they hold only keys and pointers to 335 * other blocks 336 */ 337 struct btrfs_key_ptr { 338 struct btrfs_disk_key key; 339 __le64 blockptr; 340 __le64 generation; 341 } __attribute__ ((__packed__)); 342 343 struct btrfs_node { 344 struct btrfs_header header; 345 struct btrfs_key_ptr ptrs[]; 346 } __attribute__ ((__packed__)); 347 348 /* 349 * btrfs_paths remember the path taken from the root down to the leaf. 350 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 351 * to any other levels that are present. 352 * 353 * The slots array records the index of the item or block pointer 354 * used while walking the tree. 355 */ 356 enum { READA_NONE, READA_BACK, READA_FORWARD }; 357 struct btrfs_path { 358 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 359 int slots[BTRFS_MAX_LEVEL]; 360 /* if there is real range locking, this locks field will change */ 361 u8 locks[BTRFS_MAX_LEVEL]; 362 u8 reada; 363 /* keep some upper locks as we walk down */ 364 u8 lowest_level; 365 366 /* 367 * set by btrfs_split_item, tells search_slot to keep all locks 368 * and to force calls to keep space in the nodes 369 */ 370 unsigned int search_for_split:1; 371 unsigned int keep_locks:1; 372 unsigned int skip_locking:1; 373 unsigned int leave_spinning:1; 374 unsigned int search_commit_root:1; 375 unsigned int need_commit_sem:1; 376 unsigned int skip_release_on_error:1; 377 }; 378 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \ 379 sizeof(struct btrfs_item)) 380 struct btrfs_dev_replace { 381 u64 replace_state; /* see #define above */ 382 time64_t time_started; /* seconds since 1-Jan-1970 */ 383 time64_t time_stopped; /* seconds since 1-Jan-1970 */ 384 atomic64_t num_write_errors; 385 atomic64_t num_uncorrectable_read_errors; 386 387 u64 cursor_left; 388 u64 committed_cursor_left; 389 u64 cursor_left_last_write_of_item; 390 u64 cursor_right; 391 392 u64 cont_reading_from_srcdev_mode; /* see #define above */ 393 394 int is_valid; 395 int item_needs_writeback; 396 struct btrfs_device *srcdev; 397 struct btrfs_device *tgtdev; 398 399 struct mutex lock_finishing_cancel_unmount; 400 struct rw_semaphore rwsem; 401 402 struct btrfs_scrub_progress scrub_progress; 403 404 struct percpu_counter bio_counter; 405 wait_queue_head_t replace_wait; 406 }; 407 408 /* 409 * free clusters are used to claim free space in relatively large chunks, 410 * allowing us to do less seeky writes. They are used for all metadata 411 * allocations. In ssd_spread mode they are also used for data allocations. 412 */ 413 struct btrfs_free_cluster { 414 spinlock_t lock; 415 spinlock_t refill_lock; 416 struct rb_root root; 417 418 /* largest extent in this cluster */ 419 u64 max_size; 420 421 /* first extent starting offset */ 422 u64 window_start; 423 424 /* We did a full search and couldn't create a cluster */ 425 bool fragmented; 426 427 struct btrfs_block_group *block_group; 428 /* 429 * when a cluster is allocated from a block group, we put the 430 * cluster onto a list in the block group so that it can 431 * be freed before the block group is freed. 432 */ 433 struct list_head block_group_list; 434 }; 435 436 enum btrfs_caching_type { 437 BTRFS_CACHE_NO, 438 BTRFS_CACHE_STARTED, 439 BTRFS_CACHE_FAST, 440 BTRFS_CACHE_FINISHED, 441 BTRFS_CACHE_ERROR, 442 }; 443 444 /* 445 * Tree to record all locked full stripes of a RAID5/6 block group 446 */ 447 struct btrfs_full_stripe_locks_tree { 448 struct rb_root root; 449 struct mutex lock; 450 }; 451 452 /* Discard control. */ 453 /* 454 * Async discard uses multiple lists to differentiate the discard filter 455 * parameters. Index 0 is for completely free block groups where we need to 456 * ensure the entire block group is trimmed without being lossy. Indices 457 * afterwards represent monotonically decreasing discard filter sizes to 458 * prioritize what should be discarded next. 459 */ 460 #define BTRFS_NR_DISCARD_LISTS 3 461 #define BTRFS_DISCARD_INDEX_UNUSED 0 462 #define BTRFS_DISCARD_INDEX_START 1 463 464 struct btrfs_discard_ctl { 465 struct workqueue_struct *discard_workers; 466 struct delayed_work work; 467 spinlock_t lock; 468 struct btrfs_block_group *block_group; 469 struct list_head discard_list[BTRFS_NR_DISCARD_LISTS]; 470 u64 prev_discard; 471 atomic_t discardable_extents; 472 atomic64_t discardable_bytes; 473 u64 max_discard_size; 474 unsigned long delay; 475 u32 iops_limit; 476 u32 kbps_limit; 477 u64 discard_extent_bytes; 478 u64 discard_bitmap_bytes; 479 atomic64_t discard_bytes_saved; 480 }; 481 482 /* delayed seq elem */ 483 struct seq_list { 484 struct list_head list; 485 u64 seq; 486 }; 487 488 #define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 } 489 490 #define SEQ_LAST ((u64)-1) 491 492 enum btrfs_orphan_cleanup_state { 493 ORPHAN_CLEANUP_STARTED = 1, 494 ORPHAN_CLEANUP_DONE = 2, 495 }; 496 497 void btrfs_init_async_reclaim_work(struct work_struct *work); 498 499 /* fs_info */ 500 struct reloc_control; 501 struct btrfs_device; 502 struct btrfs_fs_devices; 503 struct btrfs_balance_control; 504 struct btrfs_delayed_root; 505 506 /* 507 * Block group or device which contains an active swapfile. Used for preventing 508 * unsafe operations while a swapfile is active. 509 * 510 * These are sorted on (ptr, inode) (note that a block group or device can 511 * contain more than one swapfile). We compare the pointer values because we 512 * don't actually care what the object is, we just need a quick check whether 513 * the object exists in the rbtree. 514 */ 515 struct btrfs_swapfile_pin { 516 struct rb_node node; 517 void *ptr; 518 struct inode *inode; 519 /* 520 * If true, ptr points to a struct btrfs_block_group. Otherwise, ptr 521 * points to a struct btrfs_device. 522 */ 523 bool is_block_group; 524 }; 525 526 bool btrfs_pinned_by_swapfile(struct btrfs_fs_info *fs_info, void *ptr); 527 528 enum { 529 BTRFS_FS_BARRIER, 530 BTRFS_FS_CLOSING_START, 531 BTRFS_FS_CLOSING_DONE, 532 BTRFS_FS_LOG_RECOVERING, 533 BTRFS_FS_OPEN, 534 BTRFS_FS_QUOTA_ENABLED, 535 BTRFS_FS_UPDATE_UUID_TREE_GEN, 536 BTRFS_FS_CREATING_FREE_SPACE_TREE, 537 BTRFS_FS_BTREE_ERR, 538 BTRFS_FS_LOG1_ERR, 539 BTRFS_FS_LOG2_ERR, 540 BTRFS_FS_QUOTA_OVERRIDE, 541 /* Used to record internally whether fs has been frozen */ 542 BTRFS_FS_FROZEN, 543 /* 544 * Indicate that a whole-filesystem exclusive operation is running 545 * (device replace, resize, device add/delete, balance) 546 */ 547 BTRFS_FS_EXCL_OP, 548 /* 549 * To info transaction_kthread we need an immediate commit so it 550 * doesn't need to wait for commit_interval 551 */ 552 BTRFS_FS_NEED_ASYNC_COMMIT, 553 /* 554 * Indicate that balance has been set up from the ioctl and is in the 555 * main phase. The fs_info::balance_ctl is initialized. 556 * Set and cleared while holding fs_info::balance_mutex. 557 */ 558 BTRFS_FS_BALANCE_RUNNING, 559 560 /* Indicate that the cleaner thread is awake and doing something. */ 561 BTRFS_FS_CLEANER_RUNNING, 562 563 /* 564 * The checksumming has an optimized version and is considered fast, 565 * so we don't need to offload checksums to workqueues. 566 */ 567 BTRFS_FS_CSUM_IMPL_FAST, 568 569 /* Indicate that the discard workqueue can service discards. */ 570 BTRFS_FS_DISCARD_RUNNING, 571 }; 572 573 struct btrfs_fs_info { 574 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 575 unsigned long flags; 576 struct btrfs_root *extent_root; 577 struct btrfs_root *tree_root; 578 struct btrfs_root *chunk_root; 579 struct btrfs_root *dev_root; 580 struct btrfs_root *fs_root; 581 struct btrfs_root *csum_root; 582 struct btrfs_root *quota_root; 583 struct btrfs_root *uuid_root; 584 struct btrfs_root *free_space_root; 585 struct btrfs_root *data_reloc_root; 586 587 /* the log root tree is a directory of all the other log roots */ 588 struct btrfs_root *log_root_tree; 589 590 spinlock_t fs_roots_radix_lock; 591 struct radix_tree_root fs_roots_radix; 592 593 /* block group cache stuff */ 594 spinlock_t block_group_cache_lock; 595 u64 first_logical_byte; 596 struct rb_root block_group_cache_tree; 597 598 /* keep track of unallocated space */ 599 atomic64_t free_chunk_space; 600 601 /* Track ranges which are used by log trees blocks/logged data extents */ 602 struct extent_io_tree excluded_extents; 603 604 /* logical->physical extent mapping */ 605 struct extent_map_tree mapping_tree; 606 607 /* 608 * block reservation for extent, checksum, root tree and 609 * delayed dir index item 610 */ 611 struct btrfs_block_rsv global_block_rsv; 612 /* block reservation for metadata operations */ 613 struct btrfs_block_rsv trans_block_rsv; 614 /* block reservation for chunk tree */ 615 struct btrfs_block_rsv chunk_block_rsv; 616 /* block reservation for delayed operations */ 617 struct btrfs_block_rsv delayed_block_rsv; 618 /* block reservation for delayed refs */ 619 struct btrfs_block_rsv delayed_refs_rsv; 620 621 struct btrfs_block_rsv empty_block_rsv; 622 623 u64 generation; 624 u64 last_trans_committed; 625 u64 avg_delayed_ref_runtime; 626 627 /* 628 * this is updated to the current trans every time a full commit 629 * is required instead of the faster short fsync log commits 630 */ 631 u64 last_trans_log_full_commit; 632 unsigned long mount_opt; 633 /* 634 * Track requests for actions that need to be done during transaction 635 * commit (like for some mount options). 636 */ 637 unsigned long pending_changes; 638 unsigned long compress_type:4; 639 unsigned int compress_level; 640 u32 commit_interval; 641 /* 642 * It is a suggestive number, the read side is safe even it gets a 643 * wrong number because we will write out the data into a regular 644 * extent. The write side(mount/remount) is under ->s_umount lock, 645 * so it is also safe. 646 */ 647 u64 max_inline; 648 649 struct btrfs_transaction *running_transaction; 650 wait_queue_head_t transaction_throttle; 651 wait_queue_head_t transaction_wait; 652 wait_queue_head_t transaction_blocked_wait; 653 wait_queue_head_t async_submit_wait; 654 655 /* 656 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 657 * when they are updated. 658 * 659 * Because we do not clear the flags for ever, so we needn't use 660 * the lock on the read side. 661 * 662 * We also needn't use the lock when we mount the fs, because 663 * there is no other task which will update the flag. 664 */ 665 spinlock_t super_lock; 666 struct btrfs_super_block *super_copy; 667 struct btrfs_super_block *super_for_commit; 668 struct super_block *sb; 669 struct inode *btree_inode; 670 struct mutex tree_log_mutex; 671 struct mutex transaction_kthread_mutex; 672 struct mutex cleaner_mutex; 673 struct mutex chunk_mutex; 674 675 /* 676 * this is taken to make sure we don't set block groups ro after 677 * the free space cache has been allocated on them 678 */ 679 struct mutex ro_block_group_mutex; 680 681 /* this is used during read/modify/write to make sure 682 * no two ios are trying to mod the same stripe at the same 683 * time 684 */ 685 struct btrfs_stripe_hash_table *stripe_hash_table; 686 687 /* 688 * this protects the ordered operations list only while we are 689 * processing all of the entries on it. This way we make 690 * sure the commit code doesn't find the list temporarily empty 691 * because another function happens to be doing non-waiting preflush 692 * before jumping into the main commit. 693 */ 694 struct mutex ordered_operations_mutex; 695 696 struct rw_semaphore commit_root_sem; 697 698 struct rw_semaphore cleanup_work_sem; 699 700 struct rw_semaphore subvol_sem; 701 702 spinlock_t trans_lock; 703 /* 704 * the reloc mutex goes with the trans lock, it is taken 705 * during commit to protect us from the relocation code 706 */ 707 struct mutex reloc_mutex; 708 709 struct list_head trans_list; 710 struct list_head dead_roots; 711 struct list_head caching_block_groups; 712 713 spinlock_t delayed_iput_lock; 714 struct list_head delayed_iputs; 715 atomic_t nr_delayed_iputs; 716 wait_queue_head_t delayed_iputs_wait; 717 718 atomic64_t tree_mod_seq; 719 720 /* this protects tree_mod_log and tree_mod_seq_list */ 721 rwlock_t tree_mod_log_lock; 722 struct rb_root tree_mod_log; 723 struct list_head tree_mod_seq_list; 724 725 atomic_t async_delalloc_pages; 726 727 /* 728 * this is used to protect the following list -- ordered_roots. 729 */ 730 spinlock_t ordered_root_lock; 731 732 /* 733 * all fs/file tree roots in which there are data=ordered extents 734 * pending writeback are added into this list. 735 * 736 * these can span multiple transactions and basically include 737 * every dirty data page that isn't from nodatacow 738 */ 739 struct list_head ordered_roots; 740 741 struct mutex delalloc_root_mutex; 742 spinlock_t delalloc_root_lock; 743 /* all fs/file tree roots that have delalloc inodes. */ 744 struct list_head delalloc_roots; 745 746 /* 747 * there is a pool of worker threads for checksumming during writes 748 * and a pool for checksumming after reads. This is because readers 749 * can run with FS locks held, and the writers may be waiting for 750 * those locks. We don't want ordering in the pending list to cause 751 * deadlocks, and so the two are serviced separately. 752 * 753 * A third pool does submit_bio to avoid deadlocking with the other 754 * two 755 */ 756 struct btrfs_workqueue *workers; 757 struct btrfs_workqueue *delalloc_workers; 758 struct btrfs_workqueue *flush_workers; 759 struct btrfs_workqueue *endio_workers; 760 struct btrfs_workqueue *endio_meta_workers; 761 struct btrfs_workqueue *endio_raid56_workers; 762 struct btrfs_workqueue *rmw_workers; 763 struct btrfs_workqueue *endio_meta_write_workers; 764 struct btrfs_workqueue *endio_write_workers; 765 struct btrfs_workqueue *endio_freespace_worker; 766 struct btrfs_workqueue *caching_workers; 767 struct btrfs_workqueue *readahead_workers; 768 769 /* 770 * fixup workers take dirty pages that didn't properly go through 771 * the cow mechanism and make them safe to write. It happens 772 * for the sys_munmap function call path 773 */ 774 struct btrfs_workqueue *fixup_workers; 775 struct btrfs_workqueue *delayed_workers; 776 777 struct task_struct *transaction_kthread; 778 struct task_struct *cleaner_kthread; 779 u32 thread_pool_size; 780 781 struct kobject *space_info_kobj; 782 783 u64 total_pinned; 784 785 /* used to keep from writing metadata until there is a nice batch */ 786 struct percpu_counter dirty_metadata_bytes; 787 struct percpu_counter delalloc_bytes; 788 struct percpu_counter dio_bytes; 789 s32 dirty_metadata_batch; 790 s32 delalloc_batch; 791 792 struct list_head dirty_cowonly_roots; 793 794 struct btrfs_fs_devices *fs_devices; 795 796 /* 797 * The space_info list is effectively read only after initial 798 * setup. It is populated at mount time and cleaned up after 799 * all block groups are removed. RCU is used to protect it. 800 */ 801 struct list_head space_info; 802 803 struct btrfs_space_info *data_sinfo; 804 805 struct reloc_control *reloc_ctl; 806 807 /* data_alloc_cluster is only used in ssd_spread mode */ 808 struct btrfs_free_cluster data_alloc_cluster; 809 810 /* all metadata allocations go through this cluster */ 811 struct btrfs_free_cluster meta_alloc_cluster; 812 813 /* auto defrag inodes go here */ 814 spinlock_t defrag_inodes_lock; 815 struct rb_root defrag_inodes; 816 atomic_t defrag_running; 817 818 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 819 seqlock_t profiles_lock; 820 /* 821 * these three are in extended format (availability of single 822 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other 823 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits) 824 */ 825 u64 avail_data_alloc_bits; 826 u64 avail_metadata_alloc_bits; 827 u64 avail_system_alloc_bits; 828 829 /* restriper state */ 830 spinlock_t balance_lock; 831 struct mutex balance_mutex; 832 atomic_t balance_pause_req; 833 atomic_t balance_cancel_req; 834 struct btrfs_balance_control *balance_ctl; 835 wait_queue_head_t balance_wait_q; 836 837 u32 data_chunk_allocations; 838 u32 metadata_ratio; 839 840 void *bdev_holder; 841 842 /* private scrub information */ 843 struct mutex scrub_lock; 844 atomic_t scrubs_running; 845 atomic_t scrub_pause_req; 846 atomic_t scrubs_paused; 847 atomic_t scrub_cancel_req; 848 wait_queue_head_t scrub_pause_wait; 849 /* 850 * The worker pointers are NULL iff the refcount is 0, ie. scrub is not 851 * running. 852 */ 853 refcount_t scrub_workers_refcnt; 854 struct btrfs_workqueue *scrub_workers; 855 struct btrfs_workqueue *scrub_wr_completion_workers; 856 struct btrfs_workqueue *scrub_parity_workers; 857 858 struct btrfs_discard_ctl discard_ctl; 859 860 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 861 u32 check_integrity_print_mask; 862 #endif 863 /* is qgroup tracking in a consistent state? */ 864 u64 qgroup_flags; 865 866 /* holds configuration and tracking. Protected by qgroup_lock */ 867 struct rb_root qgroup_tree; 868 spinlock_t qgroup_lock; 869 870 /* 871 * used to avoid frequently calling ulist_alloc()/ulist_free() 872 * when doing qgroup accounting, it must be protected by qgroup_lock. 873 */ 874 struct ulist *qgroup_ulist; 875 876 /* protect user change for quota operations */ 877 struct mutex qgroup_ioctl_lock; 878 879 /* list of dirty qgroups to be written at next commit */ 880 struct list_head dirty_qgroups; 881 882 /* used by qgroup for an efficient tree traversal */ 883 u64 qgroup_seq; 884 885 /* qgroup rescan items */ 886 struct mutex qgroup_rescan_lock; /* protects the progress item */ 887 struct btrfs_key qgroup_rescan_progress; 888 struct btrfs_workqueue *qgroup_rescan_workers; 889 struct completion qgroup_rescan_completion; 890 struct btrfs_work qgroup_rescan_work; 891 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */ 892 893 /* filesystem state */ 894 unsigned long fs_state; 895 896 struct btrfs_delayed_root *delayed_root; 897 898 /* readahead tree */ 899 spinlock_t reada_lock; 900 struct radix_tree_root reada_tree; 901 902 /* readahead works cnt */ 903 atomic_t reada_works_cnt; 904 905 /* Extent buffer radix tree */ 906 spinlock_t buffer_lock; 907 struct radix_tree_root buffer_radix; 908 909 /* next backup root to be overwritten */ 910 int backup_root_index; 911 912 /* device replace state */ 913 struct btrfs_dev_replace dev_replace; 914 915 struct semaphore uuid_tree_rescan_sem; 916 917 /* Used to reclaim the metadata space in the background. */ 918 struct work_struct async_reclaim_work; 919 920 spinlock_t unused_bgs_lock; 921 struct list_head unused_bgs; 922 struct mutex unused_bg_unpin_mutex; 923 struct mutex delete_unused_bgs_mutex; 924 925 /* Cached block sizes */ 926 u32 nodesize; 927 u32 sectorsize; 928 u32 stripesize; 929 930 /* Block groups and devices containing active swapfiles. */ 931 spinlock_t swapfile_pins_lock; 932 struct rb_root swapfile_pins; 933 934 struct crypto_shash *csum_shash; 935 936 /* 937 * Number of send operations in progress. 938 * Updated while holding fs_info::balance_mutex. 939 */ 940 int send_in_progress; 941 942 #ifdef CONFIG_BTRFS_FS_REF_VERIFY 943 spinlock_t ref_verify_lock; 944 struct rb_root block_tree; 945 #endif 946 947 #ifdef CONFIG_BTRFS_DEBUG 948 struct kobject *debug_kobj; 949 struct kobject *discard_debug_kobj; 950 struct list_head allocated_roots; 951 952 spinlock_t eb_leak_lock; 953 struct list_head allocated_ebs; 954 #endif 955 }; 956 957 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb) 958 { 959 return sb->s_fs_info; 960 } 961 962 /* 963 * The state of btrfs root 964 */ 965 enum { 966 /* 967 * btrfs_record_root_in_trans is a multi-step process, and it can race 968 * with the balancing code. But the race is very small, and only the 969 * first time the root is added to each transaction. So IN_TRANS_SETUP 970 * is used to tell us when more checks are required 971 */ 972 BTRFS_ROOT_IN_TRANS_SETUP, 973 974 /* 975 * Set if tree blocks of this root can be shared by other roots. 976 * Only subvolume trees and their reloc trees have this bit set. 977 * Conflicts with TRACK_DIRTY bit. 978 * 979 * This affects two things: 980 * 981 * - How balance works 982 * For shareable roots, we need to use reloc tree and do path 983 * replacement for balance, and need various pre/post hooks for 984 * snapshot creation to handle them. 985 * 986 * While for non-shareable trees, we just simply do a tree search 987 * with COW. 988 * 989 * - How dirty roots are tracked 990 * For shareable roots, btrfs_record_root_in_trans() is needed to 991 * track them, while non-subvolume roots have TRACK_DIRTY bit, they 992 * don't need to set this manually. 993 */ 994 BTRFS_ROOT_SHAREABLE, 995 BTRFS_ROOT_TRACK_DIRTY, 996 BTRFS_ROOT_IN_RADIX, 997 BTRFS_ROOT_ORPHAN_ITEM_INSERTED, 998 BTRFS_ROOT_DEFRAG_RUNNING, 999 BTRFS_ROOT_FORCE_COW, 1000 BTRFS_ROOT_MULTI_LOG_TASKS, 1001 BTRFS_ROOT_DIRTY, 1002 BTRFS_ROOT_DELETING, 1003 1004 /* 1005 * Reloc tree is orphan, only kept here for qgroup delayed subtree scan 1006 * 1007 * Set for the subvolume tree owning the reloc tree. 1008 */ 1009 BTRFS_ROOT_DEAD_RELOC_TREE, 1010 /* Mark dead root stored on device whose cleanup needs to be resumed */ 1011 BTRFS_ROOT_DEAD_TREE, 1012 /* The root has a log tree. Used only for subvolume roots. */ 1013 BTRFS_ROOT_HAS_LOG_TREE, 1014 }; 1015 1016 /* 1017 * Record swapped tree blocks of a subvolume tree for delayed subtree trace 1018 * code. For detail check comment in fs/btrfs/qgroup.c. 1019 */ 1020 struct btrfs_qgroup_swapped_blocks { 1021 spinlock_t lock; 1022 /* RM_EMPTY_ROOT() of above blocks[] */ 1023 bool swapped; 1024 struct rb_root blocks[BTRFS_MAX_LEVEL]; 1025 }; 1026 1027 /* 1028 * in ram representation of the tree. extent_root is used for all allocations 1029 * and for the extent tree extent_root root. 1030 */ 1031 struct btrfs_root { 1032 struct extent_buffer *node; 1033 1034 struct extent_buffer *commit_root; 1035 struct btrfs_root *log_root; 1036 struct btrfs_root *reloc_root; 1037 1038 unsigned long state; 1039 struct btrfs_root_item root_item; 1040 struct btrfs_key root_key; 1041 struct btrfs_fs_info *fs_info; 1042 struct extent_io_tree dirty_log_pages; 1043 1044 struct mutex objectid_mutex; 1045 1046 spinlock_t accounting_lock; 1047 struct btrfs_block_rsv *block_rsv; 1048 1049 /* free ino cache stuff */ 1050 struct btrfs_free_space_ctl *free_ino_ctl; 1051 enum btrfs_caching_type ino_cache_state; 1052 spinlock_t ino_cache_lock; 1053 wait_queue_head_t ino_cache_wait; 1054 struct btrfs_free_space_ctl *free_ino_pinned; 1055 u64 ino_cache_progress; 1056 struct inode *ino_cache_inode; 1057 1058 struct mutex log_mutex; 1059 wait_queue_head_t log_writer_wait; 1060 wait_queue_head_t log_commit_wait[2]; 1061 struct list_head log_ctxs[2]; 1062 atomic_t log_writers; 1063 atomic_t log_commit[2]; 1064 atomic_t log_batch; 1065 int log_transid; 1066 /* No matter the commit succeeds or not*/ 1067 int log_transid_committed; 1068 /* Just be updated when the commit succeeds. */ 1069 int last_log_commit; 1070 pid_t log_start_pid; 1071 1072 u64 last_trans; 1073 1074 u32 type; 1075 1076 u64 highest_objectid; 1077 1078 u64 defrag_trans_start; 1079 struct btrfs_key defrag_progress; 1080 struct btrfs_key defrag_max; 1081 1082 /* The dirty list is only used by non-shareable roots */ 1083 struct list_head dirty_list; 1084 1085 struct list_head root_list; 1086 1087 spinlock_t log_extents_lock[2]; 1088 struct list_head logged_list[2]; 1089 1090 int orphan_cleanup_state; 1091 1092 spinlock_t inode_lock; 1093 /* red-black tree that keeps track of in-memory inodes */ 1094 struct rb_root inode_tree; 1095 1096 /* 1097 * radix tree that keeps track of delayed nodes of every inode, 1098 * protected by inode_lock 1099 */ 1100 struct radix_tree_root delayed_nodes_tree; 1101 /* 1102 * right now this just gets used so that a root has its own devid 1103 * for stat. It may be used for more later 1104 */ 1105 dev_t anon_dev; 1106 1107 spinlock_t root_item_lock; 1108 refcount_t refs; 1109 1110 struct mutex delalloc_mutex; 1111 spinlock_t delalloc_lock; 1112 /* 1113 * all of the inodes that have delalloc bytes. It is possible for 1114 * this list to be empty even when there is still dirty data=ordered 1115 * extents waiting to finish IO. 1116 */ 1117 struct list_head delalloc_inodes; 1118 struct list_head delalloc_root; 1119 u64 nr_delalloc_inodes; 1120 1121 struct mutex ordered_extent_mutex; 1122 /* 1123 * this is used by the balancing code to wait for all the pending 1124 * ordered extents 1125 */ 1126 spinlock_t ordered_extent_lock; 1127 1128 /* 1129 * all of the data=ordered extents pending writeback 1130 * these can span multiple transactions and basically include 1131 * every dirty data page that isn't from nodatacow 1132 */ 1133 struct list_head ordered_extents; 1134 struct list_head ordered_root; 1135 u64 nr_ordered_extents; 1136 1137 /* 1138 * Not empty if this subvolume root has gone through tree block swap 1139 * (relocation) 1140 * 1141 * Will be used by reloc_control::dirty_subvol_roots. 1142 */ 1143 struct list_head reloc_dirty_list; 1144 1145 /* 1146 * Number of currently running SEND ioctls to prevent 1147 * manipulation with the read-only status via SUBVOL_SETFLAGS 1148 */ 1149 int send_in_progress; 1150 /* 1151 * Number of currently running deduplication operations that have a 1152 * destination inode belonging to this root. Protected by the lock 1153 * root_item_lock. 1154 */ 1155 int dedupe_in_progress; 1156 /* For exclusion of snapshot creation and nocow writes */ 1157 struct btrfs_drew_lock snapshot_lock; 1158 1159 atomic_t snapshot_force_cow; 1160 1161 /* For qgroup metadata reserved space */ 1162 spinlock_t qgroup_meta_rsv_lock; 1163 u64 qgroup_meta_rsv_pertrans; 1164 u64 qgroup_meta_rsv_prealloc; 1165 1166 /* Number of active swapfiles */ 1167 atomic_t nr_swapfiles; 1168 1169 /* Record pairs of swapped blocks for qgroup */ 1170 struct btrfs_qgroup_swapped_blocks swapped_blocks; 1171 1172 /* Used only by log trees, when logging csum items */ 1173 struct extent_io_tree log_csum_range; 1174 1175 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 1176 u64 alloc_bytenr; 1177 #endif 1178 1179 #ifdef CONFIG_BTRFS_DEBUG 1180 struct list_head leak_list; 1181 #endif 1182 }; 1183 1184 struct btrfs_clone_extent_info { 1185 u64 disk_offset; 1186 u64 disk_len; 1187 u64 data_offset; 1188 u64 data_len; 1189 u64 file_offset; 1190 char *extent_buf; 1191 u32 item_size; 1192 }; 1193 1194 struct btrfs_file_private { 1195 void *filldir_buf; 1196 }; 1197 1198 static inline u32 btrfs_inode_sectorsize(const struct inode *inode) 1199 { 1200 return btrfs_sb(inode->i_sb)->sectorsize; 1201 } 1202 1203 static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info) 1204 { 1205 1206 return info->nodesize - sizeof(struct btrfs_header); 1207 } 1208 1209 #define BTRFS_LEAF_DATA_OFFSET offsetof(struct btrfs_leaf, items) 1210 1211 static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info) 1212 { 1213 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item); 1214 } 1215 1216 static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info) 1217 { 1218 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr); 1219 } 1220 1221 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \ 1222 (offsetof(struct btrfs_file_extent_item, disk_bytenr)) 1223 static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info) 1224 { 1225 return BTRFS_MAX_ITEM_SIZE(info) - 1226 BTRFS_FILE_EXTENT_INLINE_DATA_START; 1227 } 1228 1229 static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info) 1230 { 1231 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item); 1232 } 1233 1234 /* 1235 * Flags for mount options. 1236 * 1237 * Note: don't forget to add new options to btrfs_show_options() 1238 */ 1239 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1240 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1241 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1242 #define BTRFS_MOUNT_SSD (1 << 3) 1243 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1244 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1245 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1246 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1247 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1248 #define BTRFS_MOUNT_NOSSD (1 << 9) 1249 #define BTRFS_MOUNT_DISCARD_SYNC (1 << 10) 1250 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1251 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1252 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1253 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1254 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1255 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) 1256 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) 1257 #define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) 1258 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) 1259 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) 1260 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) 1261 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) 1262 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) 1263 #define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24) 1264 #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25) 1265 #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26) 1266 #define BTRFS_MOUNT_NOLOGREPLAY (1 << 27) 1267 #define BTRFS_MOUNT_REF_VERIFY (1 << 28) 1268 #define BTRFS_MOUNT_DISCARD_ASYNC (1 << 29) 1269 1270 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 1271 #define BTRFS_DEFAULT_MAX_INLINE (2048) 1272 1273 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1274 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1275 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1276 #define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \ 1277 BTRFS_MOUNT_##opt) 1278 1279 #define btrfs_set_and_info(fs_info, opt, fmt, args...) \ 1280 { \ 1281 if (!btrfs_test_opt(fs_info, opt)) \ 1282 btrfs_info(fs_info, fmt, ##args); \ 1283 btrfs_set_opt(fs_info->mount_opt, opt); \ 1284 } 1285 1286 #define btrfs_clear_and_info(fs_info, opt, fmt, args...) \ 1287 { \ 1288 if (btrfs_test_opt(fs_info, opt)) \ 1289 btrfs_info(fs_info, fmt, ##args); \ 1290 btrfs_clear_opt(fs_info->mount_opt, opt); \ 1291 } 1292 1293 /* 1294 * Requests for changes that need to be done during transaction commit. 1295 * 1296 * Internal mount options that are used for special handling of the real 1297 * mount options (eg. cannot be set during remount and have to be set during 1298 * transaction commit) 1299 */ 1300 1301 #define BTRFS_PENDING_SET_INODE_MAP_CACHE (0) 1302 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1) 1303 #define BTRFS_PENDING_COMMIT (2) 1304 1305 #define btrfs_test_pending(info, opt) \ 1306 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1307 #define btrfs_set_pending(info, opt) \ 1308 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1309 #define btrfs_clear_pending(info, opt) \ 1310 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1311 1312 /* 1313 * Helpers for setting pending mount option changes. 1314 * 1315 * Expects corresponding macros 1316 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name 1317 */ 1318 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \ 1319 do { \ 1320 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1321 btrfs_info((info), fmt, ##args); \ 1322 btrfs_set_pending((info), SET_##opt); \ 1323 btrfs_clear_pending((info), CLEAR_##opt); \ 1324 } \ 1325 } while(0) 1326 1327 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \ 1328 do { \ 1329 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1330 btrfs_info((info), fmt, ##args); \ 1331 btrfs_set_pending((info), CLEAR_##opt); \ 1332 btrfs_clear_pending((info), SET_##opt); \ 1333 } \ 1334 } while(0) 1335 1336 /* 1337 * Inode flags 1338 */ 1339 #define BTRFS_INODE_NODATASUM (1 << 0) 1340 #define BTRFS_INODE_NODATACOW (1 << 1) 1341 #define BTRFS_INODE_READONLY (1 << 2) 1342 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1343 #define BTRFS_INODE_PREALLOC (1 << 4) 1344 #define BTRFS_INODE_SYNC (1 << 5) 1345 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1346 #define BTRFS_INODE_APPEND (1 << 7) 1347 #define BTRFS_INODE_NODUMP (1 << 8) 1348 #define BTRFS_INODE_NOATIME (1 << 9) 1349 #define BTRFS_INODE_DIRSYNC (1 << 10) 1350 #define BTRFS_INODE_COMPRESS (1 << 11) 1351 1352 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 1353 1354 #define BTRFS_INODE_FLAG_MASK \ 1355 (BTRFS_INODE_NODATASUM | \ 1356 BTRFS_INODE_NODATACOW | \ 1357 BTRFS_INODE_READONLY | \ 1358 BTRFS_INODE_NOCOMPRESS | \ 1359 BTRFS_INODE_PREALLOC | \ 1360 BTRFS_INODE_SYNC | \ 1361 BTRFS_INODE_IMMUTABLE | \ 1362 BTRFS_INODE_APPEND | \ 1363 BTRFS_INODE_NODUMP | \ 1364 BTRFS_INODE_NOATIME | \ 1365 BTRFS_INODE_DIRSYNC | \ 1366 BTRFS_INODE_COMPRESS | \ 1367 BTRFS_INODE_ROOT_ITEM_INIT) 1368 1369 struct btrfs_map_token { 1370 struct extent_buffer *eb; 1371 char *kaddr; 1372 unsigned long offset; 1373 }; 1374 1375 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \ 1376 ((bytes) >> (fs_info)->sb->s_blocksize_bits) 1377 1378 static inline void btrfs_init_map_token(struct btrfs_map_token *token, 1379 struct extent_buffer *eb) 1380 { 1381 token->eb = eb; 1382 token->kaddr = page_address(eb->pages[0]); 1383 token->offset = 0; 1384 } 1385 1386 /* some macros to generate set/get functions for the struct fields. This 1387 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1388 * one for u8: 1389 */ 1390 #define le8_to_cpu(v) (v) 1391 #define cpu_to_le8(v) (v) 1392 #define __le8 u8 1393 1394 #define read_eb_member(eb, ptr, type, member, result) (\ 1395 read_extent_buffer(eb, (char *)(result), \ 1396 ((unsigned long)(ptr)) + \ 1397 offsetof(type, member), \ 1398 sizeof(((type *)0)->member))) 1399 1400 #define write_eb_member(eb, ptr, type, member, result) (\ 1401 write_extent_buffer(eb, (char *)(result), \ 1402 ((unsigned long)(ptr)) + \ 1403 offsetof(type, member), \ 1404 sizeof(((type *)0)->member))) 1405 1406 #define DECLARE_BTRFS_SETGET_BITS(bits) \ 1407 u##bits btrfs_get_token_##bits(struct btrfs_map_token *token, \ 1408 const void *ptr, unsigned long off); \ 1409 void btrfs_set_token_##bits(struct btrfs_map_token *token, \ 1410 const void *ptr, unsigned long off, \ 1411 u##bits val); \ 1412 u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ 1413 const void *ptr, unsigned long off); \ 1414 void btrfs_set_##bits(const struct extent_buffer *eb, void *ptr, \ 1415 unsigned long off, u##bits val); 1416 1417 DECLARE_BTRFS_SETGET_BITS(8) 1418 DECLARE_BTRFS_SETGET_BITS(16) 1419 DECLARE_BTRFS_SETGET_BITS(32) 1420 DECLARE_BTRFS_SETGET_BITS(64) 1421 1422 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1423 static inline u##bits btrfs_##name(const struct extent_buffer *eb, \ 1424 const type *s) \ 1425 { \ 1426 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1427 return btrfs_get_##bits(eb, s, offsetof(type, member)); \ 1428 } \ 1429 static inline void btrfs_set_##name(const struct extent_buffer *eb, type *s, \ 1430 u##bits val) \ 1431 { \ 1432 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1433 btrfs_set_##bits(eb, s, offsetof(type, member), val); \ 1434 } \ 1435 static inline u##bits btrfs_token_##name(struct btrfs_map_token *token, \ 1436 const type *s) \ 1437 { \ 1438 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1439 return btrfs_get_token_##bits(token, s, offsetof(type, member));\ 1440 } \ 1441 static inline void btrfs_set_token_##name(struct btrfs_map_token *token,\ 1442 type *s, u##bits val) \ 1443 { \ 1444 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1445 btrfs_set_token_##bits(token, s, offsetof(type, member), val); \ 1446 } 1447 1448 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1449 static inline u##bits btrfs_##name(const struct extent_buffer *eb) \ 1450 { \ 1451 const type *p = page_address(eb->pages[0]); \ 1452 u##bits res = le##bits##_to_cpu(p->member); \ 1453 return res; \ 1454 } \ 1455 static inline void btrfs_set_##name(const struct extent_buffer *eb, \ 1456 u##bits val) \ 1457 { \ 1458 type *p = page_address(eb->pages[0]); \ 1459 p->member = cpu_to_le##bits(val); \ 1460 } 1461 1462 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1463 static inline u##bits btrfs_##name(const type *s) \ 1464 { \ 1465 return le##bits##_to_cpu(s->member); \ 1466 } \ 1467 static inline void btrfs_set_##name(type *s, u##bits val) \ 1468 { \ 1469 s->member = cpu_to_le##bits(val); \ 1470 } 1471 1472 1473 static inline u64 btrfs_device_total_bytes(const struct extent_buffer *eb, 1474 struct btrfs_dev_item *s) 1475 { 1476 BUILD_BUG_ON(sizeof(u64) != 1477 sizeof(((struct btrfs_dev_item *)0))->total_bytes); 1478 return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item, 1479 total_bytes)); 1480 } 1481 static inline void btrfs_set_device_total_bytes(const struct extent_buffer *eb, 1482 struct btrfs_dev_item *s, 1483 u64 val) 1484 { 1485 BUILD_BUG_ON(sizeof(u64) != 1486 sizeof(((struct btrfs_dev_item *)0))->total_bytes); 1487 WARN_ON(!IS_ALIGNED(val, eb->fs_info->sectorsize)); 1488 btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val); 1489 } 1490 1491 1492 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1493 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1494 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1495 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1496 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1497 start_offset, 64); 1498 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1499 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1500 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1501 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1502 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1503 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1504 1505 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1506 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1507 total_bytes, 64); 1508 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1509 bytes_used, 64); 1510 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1511 io_align, 32); 1512 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1513 io_width, 32); 1514 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1515 sector_size, 32); 1516 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1517 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1518 dev_group, 32); 1519 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1520 seek_speed, 8); 1521 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1522 bandwidth, 8); 1523 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1524 generation, 64); 1525 1526 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d) 1527 { 1528 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid); 1529 } 1530 1531 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d) 1532 { 1533 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid); 1534 } 1535 1536 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1537 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1538 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1539 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1540 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1541 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1542 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1543 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1544 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1545 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1546 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1547 1548 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1549 { 1550 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1551 } 1552 1553 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1554 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1555 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1556 stripe_len, 64); 1557 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1558 io_align, 32); 1559 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1560 io_width, 32); 1561 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1562 sector_size, 32); 1563 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1564 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1565 num_stripes, 16); 1566 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1567 sub_stripes, 16); 1568 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1569 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1570 1571 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1572 int nr) 1573 { 1574 unsigned long offset = (unsigned long)c; 1575 offset += offsetof(struct btrfs_chunk, stripe); 1576 offset += nr * sizeof(struct btrfs_stripe); 1577 return (struct btrfs_stripe *)offset; 1578 } 1579 1580 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1581 { 1582 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1583 } 1584 1585 static inline u64 btrfs_stripe_offset_nr(const struct extent_buffer *eb, 1586 struct btrfs_chunk *c, int nr) 1587 { 1588 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1589 } 1590 1591 static inline u64 btrfs_stripe_devid_nr(const struct extent_buffer *eb, 1592 struct btrfs_chunk *c, int nr) 1593 { 1594 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1595 } 1596 1597 /* struct btrfs_block_group_item */ 1598 BTRFS_SETGET_STACK_FUNCS(stack_block_group_used, struct btrfs_block_group_item, 1599 used, 64); 1600 BTRFS_SETGET_FUNCS(block_group_used, struct btrfs_block_group_item, 1601 used, 64); 1602 BTRFS_SETGET_STACK_FUNCS(stack_block_group_chunk_objectid, 1603 struct btrfs_block_group_item, chunk_objectid, 64); 1604 1605 BTRFS_SETGET_FUNCS(block_group_chunk_objectid, 1606 struct btrfs_block_group_item, chunk_objectid, 64); 1607 BTRFS_SETGET_FUNCS(block_group_flags, 1608 struct btrfs_block_group_item, flags, 64); 1609 BTRFS_SETGET_STACK_FUNCS(stack_block_group_flags, 1610 struct btrfs_block_group_item, flags, 64); 1611 1612 /* struct btrfs_free_space_info */ 1613 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info, 1614 extent_count, 32); 1615 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32); 1616 1617 /* struct btrfs_inode_ref */ 1618 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1619 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1620 1621 /* struct btrfs_inode_extref */ 1622 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref, 1623 parent_objectid, 64); 1624 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref, 1625 name_len, 16); 1626 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64); 1627 1628 /* struct btrfs_inode_item */ 1629 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1630 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1631 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1632 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1633 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1634 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1635 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1636 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1637 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1638 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1639 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1640 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1641 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item, 1642 generation, 64); 1643 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item, 1644 sequence, 64); 1645 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item, 1646 transid, 64); 1647 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64); 1648 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item, 1649 nbytes, 64); 1650 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item, 1651 block_group, 64); 1652 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32); 1653 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32); 1654 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32); 1655 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32); 1656 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64); 1657 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64); 1658 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1659 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1660 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64); 1661 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32); 1662 1663 /* struct btrfs_dev_extent */ 1664 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1665 chunk_tree, 64); 1666 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1667 chunk_objectid, 64); 1668 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1669 chunk_offset, 64); 1670 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1671 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1672 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1673 generation, 64); 1674 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1675 1676 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1677 1678 static inline void btrfs_tree_block_key(const struct extent_buffer *eb, 1679 struct btrfs_tree_block_info *item, 1680 struct btrfs_disk_key *key) 1681 { 1682 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1683 } 1684 1685 static inline void btrfs_set_tree_block_key(const struct extent_buffer *eb, 1686 struct btrfs_tree_block_info *item, 1687 struct btrfs_disk_key *key) 1688 { 1689 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1690 } 1691 1692 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1693 root, 64); 1694 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1695 objectid, 64); 1696 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1697 offset, 64); 1698 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1699 count, 32); 1700 1701 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1702 count, 32); 1703 1704 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1705 type, 8); 1706 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1707 offset, 64); 1708 1709 static inline u32 btrfs_extent_inline_ref_size(int type) 1710 { 1711 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1712 type == BTRFS_SHARED_BLOCK_REF_KEY) 1713 return sizeof(struct btrfs_extent_inline_ref); 1714 if (type == BTRFS_SHARED_DATA_REF_KEY) 1715 return sizeof(struct btrfs_shared_data_ref) + 1716 sizeof(struct btrfs_extent_inline_ref); 1717 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1718 return sizeof(struct btrfs_extent_data_ref) + 1719 offsetof(struct btrfs_extent_inline_ref, offset); 1720 return 0; 1721 } 1722 1723 /* struct btrfs_node */ 1724 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1725 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1726 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 1727 blockptr, 64); 1728 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr, 1729 generation, 64); 1730 1731 static inline u64 btrfs_node_blockptr(const struct extent_buffer *eb, int nr) 1732 { 1733 unsigned long ptr; 1734 ptr = offsetof(struct btrfs_node, ptrs) + 1735 sizeof(struct btrfs_key_ptr) * nr; 1736 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1737 } 1738 1739 static inline void btrfs_set_node_blockptr(const struct extent_buffer *eb, 1740 int nr, u64 val) 1741 { 1742 unsigned long ptr; 1743 ptr = offsetof(struct btrfs_node, ptrs) + 1744 sizeof(struct btrfs_key_ptr) * nr; 1745 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1746 } 1747 1748 static inline u64 btrfs_node_ptr_generation(const struct extent_buffer *eb, int nr) 1749 { 1750 unsigned long ptr; 1751 ptr = offsetof(struct btrfs_node, ptrs) + 1752 sizeof(struct btrfs_key_ptr) * nr; 1753 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1754 } 1755 1756 static inline void btrfs_set_node_ptr_generation(const struct extent_buffer *eb, 1757 int nr, u64 val) 1758 { 1759 unsigned long ptr; 1760 ptr = offsetof(struct btrfs_node, ptrs) + 1761 sizeof(struct btrfs_key_ptr) * nr; 1762 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1763 } 1764 1765 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1766 { 1767 return offsetof(struct btrfs_node, ptrs) + 1768 sizeof(struct btrfs_key_ptr) * nr; 1769 } 1770 1771 void btrfs_node_key(const struct extent_buffer *eb, 1772 struct btrfs_disk_key *disk_key, int nr); 1773 1774 static inline void btrfs_set_node_key(const struct extent_buffer *eb, 1775 struct btrfs_disk_key *disk_key, int nr) 1776 { 1777 unsigned long ptr; 1778 ptr = btrfs_node_key_ptr_offset(nr); 1779 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1780 struct btrfs_key_ptr, key, disk_key); 1781 } 1782 1783 /* struct btrfs_item */ 1784 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1785 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1786 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32); 1787 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32); 1788 1789 static inline unsigned long btrfs_item_nr_offset(int nr) 1790 { 1791 return offsetof(struct btrfs_leaf, items) + 1792 sizeof(struct btrfs_item) * nr; 1793 } 1794 1795 static inline struct btrfs_item *btrfs_item_nr(int nr) 1796 { 1797 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1798 } 1799 1800 static inline u32 btrfs_item_end(const struct extent_buffer *eb, 1801 struct btrfs_item *item) 1802 { 1803 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1804 } 1805 1806 static inline u32 btrfs_item_end_nr(const struct extent_buffer *eb, int nr) 1807 { 1808 return btrfs_item_end(eb, btrfs_item_nr(nr)); 1809 } 1810 1811 static inline u32 btrfs_item_offset_nr(const struct extent_buffer *eb, int nr) 1812 { 1813 return btrfs_item_offset(eb, btrfs_item_nr(nr)); 1814 } 1815 1816 static inline u32 btrfs_item_size_nr(const struct extent_buffer *eb, int nr) 1817 { 1818 return btrfs_item_size(eb, btrfs_item_nr(nr)); 1819 } 1820 1821 static inline void btrfs_item_key(const struct extent_buffer *eb, 1822 struct btrfs_disk_key *disk_key, int nr) 1823 { 1824 struct btrfs_item *item = btrfs_item_nr(nr); 1825 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1826 } 1827 1828 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1829 struct btrfs_disk_key *disk_key, int nr) 1830 { 1831 struct btrfs_item *item = btrfs_item_nr(nr); 1832 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1833 } 1834 1835 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1836 1837 /* 1838 * struct btrfs_root_ref 1839 */ 1840 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1841 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1842 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1843 1844 /* struct btrfs_dir_item */ 1845 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1846 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1847 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1848 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1849 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8); 1850 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, 1851 data_len, 16); 1852 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, 1853 name_len, 16); 1854 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, 1855 transid, 64); 1856 1857 static inline void btrfs_dir_item_key(const struct extent_buffer *eb, 1858 const struct btrfs_dir_item *item, 1859 struct btrfs_disk_key *key) 1860 { 1861 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1862 } 1863 1864 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1865 struct btrfs_dir_item *item, 1866 const struct btrfs_disk_key *key) 1867 { 1868 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1869 } 1870 1871 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 1872 num_entries, 64); 1873 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 1874 num_bitmaps, 64); 1875 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 1876 generation, 64); 1877 1878 static inline void btrfs_free_space_key(const struct extent_buffer *eb, 1879 const struct btrfs_free_space_header *h, 1880 struct btrfs_disk_key *key) 1881 { 1882 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1883 } 1884 1885 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 1886 struct btrfs_free_space_header *h, 1887 const struct btrfs_disk_key *key) 1888 { 1889 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1890 } 1891 1892 /* struct btrfs_disk_key */ 1893 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1894 objectid, 64); 1895 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1896 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1897 1898 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1899 const struct btrfs_disk_key *disk) 1900 { 1901 cpu->offset = le64_to_cpu(disk->offset); 1902 cpu->type = disk->type; 1903 cpu->objectid = le64_to_cpu(disk->objectid); 1904 } 1905 1906 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1907 const struct btrfs_key *cpu) 1908 { 1909 disk->offset = cpu_to_le64(cpu->offset); 1910 disk->type = cpu->type; 1911 disk->objectid = cpu_to_le64(cpu->objectid); 1912 } 1913 1914 static inline void btrfs_node_key_to_cpu(const struct extent_buffer *eb, 1915 struct btrfs_key *key, int nr) 1916 { 1917 struct btrfs_disk_key disk_key; 1918 btrfs_node_key(eb, &disk_key, nr); 1919 btrfs_disk_key_to_cpu(key, &disk_key); 1920 } 1921 1922 static inline void btrfs_item_key_to_cpu(const struct extent_buffer *eb, 1923 struct btrfs_key *key, int nr) 1924 { 1925 struct btrfs_disk_key disk_key; 1926 btrfs_item_key(eb, &disk_key, nr); 1927 btrfs_disk_key_to_cpu(key, &disk_key); 1928 } 1929 1930 static inline void btrfs_dir_item_key_to_cpu(const struct extent_buffer *eb, 1931 const struct btrfs_dir_item *item, 1932 struct btrfs_key *key) 1933 { 1934 struct btrfs_disk_key disk_key; 1935 btrfs_dir_item_key(eb, item, &disk_key); 1936 btrfs_disk_key_to_cpu(key, &disk_key); 1937 } 1938 1939 /* struct btrfs_header */ 1940 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1941 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1942 generation, 64); 1943 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1944 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1945 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1946 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1947 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header, 1948 generation, 64); 1949 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64); 1950 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, 1951 nritems, 32); 1952 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64); 1953 1954 static inline int btrfs_header_flag(const struct extent_buffer *eb, u64 flag) 1955 { 1956 return (btrfs_header_flags(eb) & flag) == flag; 1957 } 1958 1959 static inline void btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1960 { 1961 u64 flags = btrfs_header_flags(eb); 1962 btrfs_set_header_flags(eb, flags | flag); 1963 } 1964 1965 static inline void btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 1966 { 1967 u64 flags = btrfs_header_flags(eb); 1968 btrfs_set_header_flags(eb, flags & ~flag); 1969 } 1970 1971 static inline int btrfs_header_backref_rev(const struct extent_buffer *eb) 1972 { 1973 u64 flags = btrfs_header_flags(eb); 1974 return flags >> BTRFS_BACKREF_REV_SHIFT; 1975 } 1976 1977 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 1978 int rev) 1979 { 1980 u64 flags = btrfs_header_flags(eb); 1981 flags &= ~BTRFS_BACKREF_REV_MASK; 1982 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 1983 btrfs_set_header_flags(eb, flags); 1984 } 1985 1986 static inline int btrfs_is_leaf(const struct extent_buffer *eb) 1987 { 1988 return btrfs_header_level(eb) == 0; 1989 } 1990 1991 /* struct btrfs_root_item */ 1992 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 1993 generation, 64); 1994 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 1995 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 1996 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 1997 1998 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 1999 generation, 64); 2000 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 2001 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 2002 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 2003 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 2004 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 2005 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 2006 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 2007 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 2008 last_snapshot, 64); 2009 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item, 2010 generation_v2, 64); 2011 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item, 2012 ctransid, 64); 2013 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, 2014 otransid, 64); 2015 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, 2016 stransid, 64); 2017 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, 2018 rtransid, 64); 2019 2020 static inline bool btrfs_root_readonly(const struct btrfs_root *root) 2021 { 2022 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; 2023 } 2024 2025 static inline bool btrfs_root_dead(const struct btrfs_root *root) 2026 { 2027 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0; 2028 } 2029 2030 /* struct btrfs_root_backup */ 2031 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, 2032 tree_root, 64); 2033 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, 2034 tree_root_gen, 64); 2035 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, 2036 tree_root_level, 8); 2037 2038 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, 2039 chunk_root, 64); 2040 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, 2041 chunk_root_gen, 64); 2042 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, 2043 chunk_root_level, 8); 2044 2045 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, 2046 extent_root, 64); 2047 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, 2048 extent_root_gen, 64); 2049 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, 2050 extent_root_level, 8); 2051 2052 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, 2053 fs_root, 64); 2054 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, 2055 fs_root_gen, 64); 2056 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, 2057 fs_root_level, 8); 2058 2059 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, 2060 dev_root, 64); 2061 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, 2062 dev_root_gen, 64); 2063 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, 2064 dev_root_level, 8); 2065 2066 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, 2067 csum_root, 64); 2068 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, 2069 csum_root_gen, 64); 2070 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, 2071 csum_root_level, 8); 2072 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, 2073 total_bytes, 64); 2074 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, 2075 bytes_used, 64); 2076 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, 2077 num_devices, 64); 2078 2079 /* struct btrfs_balance_item */ 2080 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); 2081 2082 static inline void btrfs_balance_data(const struct extent_buffer *eb, 2083 const struct btrfs_balance_item *bi, 2084 struct btrfs_disk_balance_args *ba) 2085 { 2086 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2087 } 2088 2089 static inline void btrfs_set_balance_data(struct extent_buffer *eb, 2090 struct btrfs_balance_item *bi, 2091 const struct btrfs_disk_balance_args *ba) 2092 { 2093 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2094 } 2095 2096 static inline void btrfs_balance_meta(const struct extent_buffer *eb, 2097 const struct btrfs_balance_item *bi, 2098 struct btrfs_disk_balance_args *ba) 2099 { 2100 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2101 } 2102 2103 static inline void btrfs_set_balance_meta(struct extent_buffer *eb, 2104 struct btrfs_balance_item *bi, 2105 const struct btrfs_disk_balance_args *ba) 2106 { 2107 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2108 } 2109 2110 static inline void btrfs_balance_sys(const struct extent_buffer *eb, 2111 const struct btrfs_balance_item *bi, 2112 struct btrfs_disk_balance_args *ba) 2113 { 2114 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2115 } 2116 2117 static inline void btrfs_set_balance_sys(struct extent_buffer *eb, 2118 struct btrfs_balance_item *bi, 2119 const struct btrfs_disk_balance_args *ba) 2120 { 2121 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2122 } 2123 2124 static inline void 2125 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu, 2126 const struct btrfs_disk_balance_args *disk) 2127 { 2128 memset(cpu, 0, sizeof(*cpu)); 2129 2130 cpu->profiles = le64_to_cpu(disk->profiles); 2131 cpu->usage = le64_to_cpu(disk->usage); 2132 cpu->devid = le64_to_cpu(disk->devid); 2133 cpu->pstart = le64_to_cpu(disk->pstart); 2134 cpu->pend = le64_to_cpu(disk->pend); 2135 cpu->vstart = le64_to_cpu(disk->vstart); 2136 cpu->vend = le64_to_cpu(disk->vend); 2137 cpu->target = le64_to_cpu(disk->target); 2138 cpu->flags = le64_to_cpu(disk->flags); 2139 cpu->limit = le64_to_cpu(disk->limit); 2140 cpu->stripes_min = le32_to_cpu(disk->stripes_min); 2141 cpu->stripes_max = le32_to_cpu(disk->stripes_max); 2142 } 2143 2144 static inline void 2145 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk, 2146 const struct btrfs_balance_args *cpu) 2147 { 2148 memset(disk, 0, sizeof(*disk)); 2149 2150 disk->profiles = cpu_to_le64(cpu->profiles); 2151 disk->usage = cpu_to_le64(cpu->usage); 2152 disk->devid = cpu_to_le64(cpu->devid); 2153 disk->pstart = cpu_to_le64(cpu->pstart); 2154 disk->pend = cpu_to_le64(cpu->pend); 2155 disk->vstart = cpu_to_le64(cpu->vstart); 2156 disk->vend = cpu_to_le64(cpu->vend); 2157 disk->target = cpu_to_le64(cpu->target); 2158 disk->flags = cpu_to_le64(cpu->flags); 2159 disk->limit = cpu_to_le64(cpu->limit); 2160 disk->stripes_min = cpu_to_le32(cpu->stripes_min); 2161 disk->stripes_max = cpu_to_le32(cpu->stripes_max); 2162 } 2163 2164 /* struct btrfs_super_block */ 2165 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 2166 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 2167 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 2168 generation, 64); 2169 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 2170 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 2171 struct btrfs_super_block, sys_chunk_array_size, 32); 2172 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 2173 struct btrfs_super_block, chunk_root_generation, 64); 2174 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 2175 root_level, 8); 2176 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 2177 chunk_root, 64); 2178 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 2179 chunk_root_level, 8); 2180 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 2181 log_root, 64); 2182 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 2183 log_root_transid, 64); 2184 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 2185 log_root_level, 8); 2186 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 2187 total_bytes, 64); 2188 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 2189 bytes_used, 64); 2190 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 2191 sectorsize, 32); 2192 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 2193 nodesize, 32); 2194 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 2195 stripesize, 32); 2196 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 2197 root_dir_objectid, 64); 2198 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 2199 num_devices, 64); 2200 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 2201 compat_flags, 64); 2202 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 2203 compat_ro_flags, 64); 2204 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 2205 incompat_flags, 64); 2206 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 2207 csum_type, 16); 2208 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 2209 cache_generation, 64); 2210 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); 2211 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, 2212 uuid_tree_generation, 64); 2213 2214 int btrfs_super_csum_size(const struct btrfs_super_block *s); 2215 const char *btrfs_super_csum_name(u16 csum_type); 2216 const char *btrfs_super_csum_driver(u16 csum_type); 2217 size_t __const btrfs_get_num_csums(void); 2218 2219 2220 /* 2221 * The leaf data grows from end-to-front in the node. 2222 * this returns the address of the start of the last item, 2223 * which is the stop of the leaf data stack 2224 */ 2225 static inline unsigned int leaf_data_end(const struct extent_buffer *leaf) 2226 { 2227 u32 nr = btrfs_header_nritems(leaf); 2228 2229 if (nr == 0) 2230 return BTRFS_LEAF_DATA_SIZE(leaf->fs_info); 2231 return btrfs_item_offset_nr(leaf, nr - 1); 2232 } 2233 2234 /* struct btrfs_file_extent_item */ 2235 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 2236 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, 2237 struct btrfs_file_extent_item, disk_bytenr, 64); 2238 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, 2239 struct btrfs_file_extent_item, offset, 64); 2240 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, 2241 struct btrfs_file_extent_item, generation, 64); 2242 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, 2243 struct btrfs_file_extent_item, num_bytes, 64); 2244 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes, 2245 struct btrfs_file_extent_item, disk_num_bytes, 64); 2246 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, 2247 struct btrfs_file_extent_item, compression, 8); 2248 2249 static inline unsigned long 2250 btrfs_file_extent_inline_start(const struct btrfs_file_extent_item *e) 2251 { 2252 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START; 2253 } 2254 2255 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2256 { 2257 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize; 2258 } 2259 2260 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2261 disk_bytenr, 64); 2262 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2263 generation, 64); 2264 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2265 disk_num_bytes, 64); 2266 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2267 offset, 64); 2268 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2269 num_bytes, 64); 2270 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2271 ram_bytes, 64); 2272 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2273 compression, 8); 2274 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2275 encryption, 8); 2276 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2277 other_encoding, 16); 2278 2279 /* 2280 * this returns the number of bytes used by the item on disk, minus the 2281 * size of any extent headers. If a file is compressed on disk, this is 2282 * the compressed size 2283 */ 2284 static inline u32 btrfs_file_extent_inline_item_len( 2285 const struct extent_buffer *eb, 2286 struct btrfs_item *e) 2287 { 2288 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START; 2289 } 2290 2291 /* btrfs_qgroup_status_item */ 2292 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item, 2293 generation, 64); 2294 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 2295 version, 64); 2296 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item, 2297 flags, 64); 2298 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item, 2299 rescan, 64); 2300 2301 /* btrfs_qgroup_info_item */ 2302 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item, 2303 generation, 64); 2304 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64); 2305 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item, 2306 rfer_cmpr, 64); 2307 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64); 2308 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item, 2309 excl_cmpr, 64); 2310 2311 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation, 2312 struct btrfs_qgroup_info_item, generation, 64); 2313 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item, 2314 rfer, 64); 2315 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr, 2316 struct btrfs_qgroup_info_item, rfer_cmpr, 64); 2317 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item, 2318 excl, 64); 2319 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr, 2320 struct btrfs_qgroup_info_item, excl_cmpr, 64); 2321 2322 /* btrfs_qgroup_limit_item */ 2323 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item, 2324 flags, 64); 2325 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item, 2326 max_rfer, 64); 2327 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item, 2328 max_excl, 64); 2329 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item, 2330 rsv_rfer, 64); 2331 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item, 2332 rsv_excl, 64); 2333 2334 /* btrfs_dev_replace_item */ 2335 BTRFS_SETGET_FUNCS(dev_replace_src_devid, 2336 struct btrfs_dev_replace_item, src_devid, 64); 2337 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode, 2338 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode, 2339 64); 2340 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item, 2341 replace_state, 64); 2342 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item, 2343 time_started, 64); 2344 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item, 2345 time_stopped, 64); 2346 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item, 2347 num_write_errors, 64); 2348 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors, 2349 struct btrfs_dev_replace_item, num_uncorrectable_read_errors, 2350 64); 2351 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item, 2352 cursor_left, 64); 2353 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item, 2354 cursor_right, 64); 2355 2356 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid, 2357 struct btrfs_dev_replace_item, src_devid, 64); 2358 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode, 2359 struct btrfs_dev_replace_item, 2360 cont_reading_from_srcdev_mode, 64); 2361 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state, 2362 struct btrfs_dev_replace_item, replace_state, 64); 2363 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started, 2364 struct btrfs_dev_replace_item, time_started, 64); 2365 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped, 2366 struct btrfs_dev_replace_item, time_stopped, 64); 2367 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors, 2368 struct btrfs_dev_replace_item, num_write_errors, 64); 2369 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors, 2370 struct btrfs_dev_replace_item, 2371 num_uncorrectable_read_errors, 64); 2372 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left, 2373 struct btrfs_dev_replace_item, cursor_left, 64); 2374 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 2375 struct btrfs_dev_replace_item, cursor_right, 64); 2376 2377 /* helper function to cast into the data area of the leaf. */ 2378 #define btrfs_item_ptr(leaf, slot, type) \ 2379 ((type *)(BTRFS_LEAF_DATA_OFFSET + \ 2380 btrfs_item_offset_nr(leaf, slot))) 2381 2382 #define btrfs_item_ptr_offset(leaf, slot) \ 2383 ((unsigned long)(BTRFS_LEAF_DATA_OFFSET + \ 2384 btrfs_item_offset_nr(leaf, slot))) 2385 2386 static inline u32 btrfs_crc32c(u32 crc, const void *address, unsigned length) 2387 { 2388 return crc32c(crc, address, length); 2389 } 2390 2391 static inline void btrfs_crc32c_final(u32 crc, u8 *result) 2392 { 2393 put_unaligned_le32(~crc, result); 2394 } 2395 2396 static inline u64 btrfs_name_hash(const char *name, int len) 2397 { 2398 return crc32c((u32)~1, name, len); 2399 } 2400 2401 /* 2402 * Figure the key offset of an extended inode ref 2403 */ 2404 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, 2405 int len) 2406 { 2407 return (u64) crc32c(parent_objectid, name, len); 2408 } 2409 2410 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) 2411 { 2412 return mapping_gfp_constraint(mapping, ~__GFP_FS); 2413 } 2414 2415 /* extent-tree.c */ 2416 2417 enum btrfs_inline_ref_type { 2418 BTRFS_REF_TYPE_INVALID, 2419 BTRFS_REF_TYPE_BLOCK, 2420 BTRFS_REF_TYPE_DATA, 2421 BTRFS_REF_TYPE_ANY, 2422 }; 2423 2424 int btrfs_get_extent_inline_ref_type(const struct extent_buffer *eb, 2425 struct btrfs_extent_inline_ref *iref, 2426 enum btrfs_inline_ref_type is_data); 2427 u64 hash_extent_data_ref(u64 root_objectid, u64 owner, u64 offset); 2428 2429 u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes); 2430 2431 /* 2432 * Use this if we would be adding new items, as we could split nodes as we cow 2433 * down the tree. 2434 */ 2435 static inline u64 btrfs_calc_insert_metadata_size(struct btrfs_fs_info *fs_info, 2436 unsigned num_items) 2437 { 2438 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; 2439 } 2440 2441 /* 2442 * Doing a truncate or a modification won't result in new nodes or leaves, just 2443 * what we need for COW. 2444 */ 2445 static inline u64 btrfs_calc_metadata_size(struct btrfs_fs_info *fs_info, 2446 unsigned num_items) 2447 { 2448 return (u64)fs_info->nodesize * BTRFS_MAX_LEVEL * num_items; 2449 } 2450 2451 int btrfs_add_excluded_extent(struct btrfs_fs_info *fs_info, 2452 u64 start, u64 num_bytes); 2453 void btrfs_free_excluded_extents(struct btrfs_block_group *cache); 2454 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 2455 unsigned long count); 2456 void btrfs_cleanup_ref_head_accounting(struct btrfs_fs_info *fs_info, 2457 struct btrfs_delayed_ref_root *delayed_refs, 2458 struct btrfs_delayed_ref_head *head); 2459 int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len); 2460 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 2461 struct btrfs_fs_info *fs_info, u64 bytenr, 2462 u64 offset, int metadata, u64 *refs, u64 *flags); 2463 int btrfs_pin_extent(struct btrfs_trans_handle *trans, u64 bytenr, u64 num, 2464 int reserved); 2465 int btrfs_pin_extent_for_log_replay(struct btrfs_trans_handle *trans, 2466 u64 bytenr, u64 num_bytes); 2467 int btrfs_exclude_logged_extents(struct extent_buffer *eb); 2468 int btrfs_cross_ref_exist(struct btrfs_root *root, 2469 u64 objectid, u64 offset, u64 bytenr); 2470 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, 2471 struct btrfs_root *root, 2472 u64 parent, u64 root_objectid, 2473 const struct btrfs_disk_key *key, 2474 int level, u64 hint, 2475 u64 empty_size); 2476 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2477 struct btrfs_root *root, 2478 struct extent_buffer *buf, 2479 u64 parent, int last_ref); 2480 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 2481 struct btrfs_root *root, u64 owner, 2482 u64 offset, u64 ram_bytes, 2483 struct btrfs_key *ins); 2484 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 2485 u64 root_objectid, u64 owner, u64 offset, 2486 struct btrfs_key *ins); 2487 int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes, 2488 u64 min_alloc_size, u64 empty_size, u64 hint_byte, 2489 struct btrfs_key *ins, int is_data, int delalloc); 2490 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2491 struct extent_buffer *buf, int full_backref); 2492 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2493 struct extent_buffer *buf, int full_backref); 2494 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2495 struct extent_buffer *eb, u64 flags, 2496 int level, int is_data); 2497 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref); 2498 2499 int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info, 2500 u64 start, u64 len, int delalloc); 2501 int btrfs_pin_reserved_extent(struct btrfs_trans_handle *trans, u64 start, 2502 u64 len); 2503 void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info); 2504 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans); 2505 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2506 struct btrfs_ref *generic_ref); 2507 2508 int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr); 2509 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2510 2511 enum btrfs_reserve_flush_enum { 2512 /* If we are in the transaction, we can't flush anything.*/ 2513 BTRFS_RESERVE_NO_FLUSH, 2514 /* 2515 * Flushing delalloc may cause deadlock somewhere, in this 2516 * case, use FLUSH LIMIT 2517 */ 2518 BTRFS_RESERVE_FLUSH_LIMIT, 2519 BTRFS_RESERVE_FLUSH_EVICT, 2520 BTRFS_RESERVE_FLUSH_ALL, 2521 BTRFS_RESERVE_FLUSH_ALL_STEAL, 2522 }; 2523 2524 enum btrfs_flush_state { 2525 FLUSH_DELAYED_ITEMS_NR = 1, 2526 FLUSH_DELAYED_ITEMS = 2, 2527 FLUSH_DELAYED_REFS_NR = 3, 2528 FLUSH_DELAYED_REFS = 4, 2529 FLUSH_DELALLOC = 5, 2530 FLUSH_DELALLOC_WAIT = 6, 2531 ALLOC_CHUNK = 7, 2532 ALLOC_CHUNK_FORCE = 8, 2533 RUN_DELAYED_IPUTS = 9, 2534 COMMIT_TRANS = 10, 2535 }; 2536 2537 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, 2538 struct btrfs_block_rsv *rsv, 2539 int nitems, bool use_global_rsv); 2540 void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info, 2541 struct btrfs_block_rsv *rsv); 2542 void btrfs_delalloc_release_extents(struct btrfs_inode *inode, u64 num_bytes); 2543 2544 int btrfs_delalloc_reserve_metadata(struct btrfs_inode *inode, u64 num_bytes); 2545 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 2546 int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info, 2547 u64 start, u64 end); 2548 int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr, 2549 u64 num_bytes, u64 *actual_bytes); 2550 int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range); 2551 2552 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 2553 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, 2554 struct btrfs_fs_info *fs_info); 2555 int btrfs_start_write_no_snapshotting(struct btrfs_root *root); 2556 void btrfs_end_write_no_snapshotting(struct btrfs_root *root); 2557 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root); 2558 2559 /* ctree.c */ 2560 int btrfs_bin_search(struct extent_buffer *eb, const struct btrfs_key *key, 2561 int *slot); 2562 int __pure btrfs_comp_cpu_keys(const struct btrfs_key *k1, const struct btrfs_key *k2); 2563 int btrfs_previous_item(struct btrfs_root *root, 2564 struct btrfs_path *path, u64 min_objectid, 2565 int type); 2566 int btrfs_previous_extent_item(struct btrfs_root *root, 2567 struct btrfs_path *path, u64 min_objectid); 2568 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info, 2569 struct btrfs_path *path, 2570 const struct btrfs_key *new_key); 2571 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2572 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 2573 struct extent_buffer *btrfs_read_lock_root_node(struct btrfs_root *root); 2574 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2575 struct btrfs_key *key, int lowest_level, 2576 u64 min_trans); 2577 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2578 struct btrfs_path *path, 2579 u64 min_trans); 2580 struct extent_buffer *btrfs_read_node_slot(struct extent_buffer *parent, 2581 int slot); 2582 2583 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2584 struct btrfs_root *root, struct extent_buffer *buf, 2585 struct extent_buffer *parent, int parent_slot, 2586 struct extent_buffer **cow_ret); 2587 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2588 struct btrfs_root *root, 2589 struct extent_buffer *buf, 2590 struct extent_buffer **cow_ret, u64 new_root_objectid); 2591 int btrfs_block_can_be_shared(struct btrfs_root *root, 2592 struct extent_buffer *buf); 2593 void btrfs_extend_item(struct btrfs_path *path, u32 data_size); 2594 void btrfs_truncate_item(struct btrfs_path *path, u32 new_size, int from_end); 2595 int btrfs_split_item(struct btrfs_trans_handle *trans, 2596 struct btrfs_root *root, 2597 struct btrfs_path *path, 2598 const struct btrfs_key *new_key, 2599 unsigned long split_offset); 2600 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 2601 struct btrfs_root *root, 2602 struct btrfs_path *path, 2603 const struct btrfs_key *new_key); 2604 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path, 2605 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key); 2606 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2607 const struct btrfs_key *key, struct btrfs_path *p, 2608 int ins_len, int cow); 2609 int btrfs_search_old_slot(struct btrfs_root *root, const struct btrfs_key *key, 2610 struct btrfs_path *p, u64 time_seq); 2611 int btrfs_search_slot_for_read(struct btrfs_root *root, 2612 const struct btrfs_key *key, 2613 struct btrfs_path *p, int find_higher, 2614 int return_any); 2615 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2616 struct btrfs_root *root, struct extent_buffer *parent, 2617 int start_slot, u64 *last_ret, 2618 struct btrfs_key *progress); 2619 void btrfs_release_path(struct btrfs_path *p); 2620 struct btrfs_path *btrfs_alloc_path(void); 2621 void btrfs_free_path(struct btrfs_path *p); 2622 2623 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2624 struct btrfs_path *path, int slot, int nr); 2625 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2626 struct btrfs_root *root, 2627 struct btrfs_path *path) 2628 { 2629 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2630 } 2631 2632 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 2633 const struct btrfs_key *cpu_key, u32 *data_size, 2634 u32 total_data, u32 total_size, int nr); 2635 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2636 const struct btrfs_key *key, void *data, u32 data_size); 2637 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2638 struct btrfs_root *root, 2639 struct btrfs_path *path, 2640 const struct btrfs_key *cpu_key, u32 *data_size, 2641 int nr); 2642 2643 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2644 struct btrfs_root *root, 2645 struct btrfs_path *path, 2646 const struct btrfs_key *key, 2647 u32 data_size) 2648 { 2649 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2650 } 2651 2652 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2653 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2654 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 2655 u64 time_seq); 2656 static inline int btrfs_next_old_item(struct btrfs_root *root, 2657 struct btrfs_path *p, u64 time_seq) 2658 { 2659 ++p->slots[0]; 2660 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) 2661 return btrfs_next_old_leaf(root, p, time_seq); 2662 return 0; 2663 } 2664 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p) 2665 { 2666 return btrfs_next_old_item(root, p, 0); 2667 } 2668 int btrfs_leaf_free_space(struct extent_buffer *leaf); 2669 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, int update_ref, 2670 int for_reloc); 2671 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2672 struct btrfs_root *root, 2673 struct extent_buffer *node, 2674 struct extent_buffer *parent); 2675 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 2676 { 2677 /* 2678 * Do it this way so we only ever do one test_bit in the normal case. 2679 */ 2680 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) { 2681 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags)) 2682 return 2; 2683 return 1; 2684 } 2685 return 0; 2686 } 2687 2688 /* 2689 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 2690 * anything except sleeping. This function is used to check the status of 2691 * the fs. 2692 */ 2693 static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info) 2694 { 2695 return fs_info->sb->s_flags & SB_RDONLY || btrfs_fs_closing(fs_info); 2696 } 2697 2698 /* tree mod log functions from ctree.c */ 2699 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, 2700 struct seq_list *elem); 2701 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info, 2702 struct seq_list *elem); 2703 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); 2704 2705 /* root-item.c */ 2706 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, u64 root_id, 2707 u64 ref_id, u64 dirid, u64 sequence, const char *name, 2708 int name_len); 2709 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, u64 root_id, 2710 u64 ref_id, u64 dirid, u64 *sequence, const char *name, 2711 int name_len); 2712 int btrfs_del_root(struct btrfs_trans_handle *trans, 2713 const struct btrfs_key *key); 2714 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2715 const struct btrfs_key *key, 2716 struct btrfs_root_item *item); 2717 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans, 2718 struct btrfs_root *root, 2719 struct btrfs_key *key, 2720 struct btrfs_root_item *item); 2721 int btrfs_find_root(struct btrfs_root *root, const struct btrfs_key *search_key, 2722 struct btrfs_path *path, struct btrfs_root_item *root_item, 2723 struct btrfs_key *root_key); 2724 int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info); 2725 void btrfs_set_root_node(struct btrfs_root_item *item, 2726 struct extent_buffer *node); 2727 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 2728 void btrfs_update_root_times(struct btrfs_trans_handle *trans, 2729 struct btrfs_root *root); 2730 2731 /* uuid-tree.c */ 2732 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, 2733 u64 subid); 2734 int btrfs_uuid_tree_remove(struct btrfs_trans_handle *trans, u8 *uuid, u8 type, 2735 u64 subid); 2736 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info); 2737 2738 /* dir-item.c */ 2739 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2740 const char *name, int name_len); 2741 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, const char *name, 2742 int name_len, struct btrfs_inode *dir, 2743 struct btrfs_key *location, u8 type, u64 index); 2744 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2745 struct btrfs_root *root, 2746 struct btrfs_path *path, u64 dir, 2747 const char *name, int name_len, 2748 int mod); 2749 struct btrfs_dir_item * 2750 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2751 struct btrfs_root *root, 2752 struct btrfs_path *path, u64 dir, 2753 u64 objectid, const char *name, int name_len, 2754 int mod); 2755 struct btrfs_dir_item * 2756 btrfs_search_dir_index_item(struct btrfs_root *root, 2757 struct btrfs_path *path, u64 dirid, 2758 const char *name, int name_len); 2759 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2760 struct btrfs_root *root, 2761 struct btrfs_path *path, 2762 struct btrfs_dir_item *di); 2763 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2764 struct btrfs_root *root, 2765 struct btrfs_path *path, u64 objectid, 2766 const char *name, u16 name_len, 2767 const void *data, u16 data_len); 2768 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2769 struct btrfs_root *root, 2770 struct btrfs_path *path, u64 dir, 2771 const char *name, u16 name_len, 2772 int mod); 2773 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info, 2774 struct btrfs_path *path, 2775 const char *name, 2776 int name_len); 2777 2778 /* orphan.c */ 2779 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2780 struct btrfs_root *root, u64 offset); 2781 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2782 struct btrfs_root *root, u64 offset); 2783 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2784 2785 /* inode-item.c */ 2786 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2787 struct btrfs_root *root, 2788 const char *name, int name_len, 2789 u64 inode_objectid, u64 ref_objectid, u64 index); 2790 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2791 struct btrfs_root *root, 2792 const char *name, int name_len, 2793 u64 inode_objectid, u64 ref_objectid, u64 *index); 2794 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2795 struct btrfs_root *root, 2796 struct btrfs_path *path, u64 objectid); 2797 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2798 *root, struct btrfs_path *path, 2799 struct btrfs_key *location, int mod); 2800 2801 struct btrfs_inode_extref * 2802 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, 2803 struct btrfs_root *root, 2804 struct btrfs_path *path, 2805 const char *name, int name_len, 2806 u64 inode_objectid, u64 ref_objectid, int ins_len, 2807 int cow); 2808 2809 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf, 2810 int slot, const char *name, 2811 int name_len); 2812 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref( 2813 struct extent_buffer *leaf, int slot, u64 ref_objectid, 2814 const char *name, int name_len); 2815 /* file-item.c */ 2816 struct btrfs_dio_private; 2817 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2818 struct btrfs_root *root, u64 bytenr, u64 len); 2819 blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, 2820 u64 offset, u8 *dst); 2821 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2822 struct btrfs_root *root, 2823 u64 objectid, u64 pos, 2824 u64 disk_offset, u64 disk_num_bytes, 2825 u64 num_bytes, u64 offset, u64 ram_bytes, 2826 u8 compression, u8 encryption, u16 other_encoding); 2827 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2828 struct btrfs_root *root, 2829 struct btrfs_path *path, u64 objectid, 2830 u64 bytenr, int mod); 2831 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2832 struct btrfs_root *root, 2833 struct btrfs_ordered_sum *sums); 2834 blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio, 2835 u64 file_start, int contig); 2836 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 2837 struct list_head *list, int search_commit); 2838 void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode, 2839 const struct btrfs_path *path, 2840 struct btrfs_file_extent_item *fi, 2841 const bool new_inline, 2842 struct extent_map *em); 2843 int btrfs_inode_clear_file_extent_range(struct btrfs_inode *inode, u64 start, 2844 u64 len); 2845 int btrfs_inode_set_file_extent_range(struct btrfs_inode *inode, u64 start, 2846 u64 len); 2847 void btrfs_inode_safe_disk_i_size_write(struct inode *inode, u64 new_i_size); 2848 u64 btrfs_file_extent_end(const struct btrfs_path *path); 2849 2850 /* inode.c */ 2851 struct extent_map *btrfs_get_extent_fiemap(struct btrfs_inode *inode, 2852 u64 start, u64 len); 2853 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, 2854 u64 *orig_start, u64 *orig_block_len, 2855 u64 *ram_bytes); 2856 2857 void __btrfs_del_delalloc_inode(struct btrfs_root *root, 2858 struct btrfs_inode *inode); 2859 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2860 int btrfs_set_inode_index(struct btrfs_inode *dir, u64 *index); 2861 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2862 struct btrfs_root *root, 2863 struct btrfs_inode *dir, struct btrfs_inode *inode, 2864 const char *name, int name_len); 2865 int btrfs_add_link(struct btrfs_trans_handle *trans, 2866 struct btrfs_inode *parent_inode, struct btrfs_inode *inode, 2867 const char *name, int name_len, int add_backref, u64 index); 2868 int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry); 2869 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len, 2870 int front); 2871 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 2872 struct btrfs_root *root, 2873 struct inode *inode, u64 new_size, 2874 u32 min_type); 2875 2876 int btrfs_start_delalloc_snapshot(struct btrfs_root *root); 2877 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int nr); 2878 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, 2879 unsigned int extra_bits, 2880 struct extent_state **cached_state); 2881 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 2882 struct btrfs_root *new_root, 2883 struct btrfs_root *parent_root, 2884 u64 new_dirid); 2885 void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state, 2886 unsigned *bits); 2887 void btrfs_clear_delalloc_extent(struct inode *inode, 2888 struct extent_state *state, unsigned *bits); 2889 void btrfs_merge_delalloc_extent(struct inode *inode, struct extent_state *new, 2890 struct extent_state *other); 2891 void btrfs_split_delalloc_extent(struct inode *inode, 2892 struct extent_state *orig, u64 split); 2893 int btrfs_bio_fits_in_stripe(struct page *page, size_t size, struct bio *bio, 2894 unsigned long bio_flags); 2895 void btrfs_set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end); 2896 vm_fault_t btrfs_page_mkwrite(struct vm_fault *vmf); 2897 int btrfs_readpage(struct file *file, struct page *page); 2898 void btrfs_evict_inode(struct inode *inode); 2899 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 2900 struct inode *btrfs_alloc_inode(struct super_block *sb); 2901 void btrfs_destroy_inode(struct inode *inode); 2902 void btrfs_free_inode(struct inode *inode); 2903 int btrfs_drop_inode(struct inode *inode); 2904 int __init btrfs_init_cachep(void); 2905 void __cold btrfs_destroy_cachep(void); 2906 struct inode *btrfs_iget_path(struct super_block *s, u64 ino, 2907 struct btrfs_root *root, struct btrfs_path *path); 2908 struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root); 2909 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode, 2910 struct page *page, size_t pg_offset, 2911 u64 start, u64 end); 2912 int btrfs_update_inode(struct btrfs_trans_handle *trans, 2913 struct btrfs_root *root, 2914 struct inode *inode); 2915 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 2916 struct btrfs_root *root, struct inode *inode); 2917 int btrfs_orphan_add(struct btrfs_trans_handle *trans, 2918 struct btrfs_inode *inode); 2919 int btrfs_orphan_cleanup(struct btrfs_root *root); 2920 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 2921 void btrfs_add_delayed_iput(struct inode *inode); 2922 void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info); 2923 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info *fs_info); 2924 int btrfs_prealloc_file_range(struct inode *inode, int mode, 2925 u64 start, u64 num_bytes, u64 min_size, 2926 loff_t actual_len, u64 *alloc_hint); 2927 int btrfs_prealloc_file_range_trans(struct inode *inode, 2928 struct btrfs_trans_handle *trans, int mode, 2929 u64 start, u64 num_bytes, u64 min_size, 2930 loff_t actual_len, u64 *alloc_hint); 2931 int btrfs_run_delalloc_range(struct inode *inode, struct page *locked_page, 2932 u64 start, u64 end, int *page_started, unsigned long *nr_written, 2933 struct writeback_control *wbc); 2934 int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end); 2935 void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start, 2936 u64 end, int uptodate); 2937 extern const struct dentry_operations btrfs_dentry_operations; 2938 2939 /* ioctl.c */ 2940 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2941 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2942 int btrfs_ioctl_get_supported_features(void __user *arg); 2943 void btrfs_sync_inode_flags_to_i_flags(struct inode *inode); 2944 int __pure btrfs_is_empty_uuid(u8 *uuid); 2945 int btrfs_defrag_file(struct inode *inode, struct file *file, 2946 struct btrfs_ioctl_defrag_range_args *range, 2947 u64 newer_than, unsigned long max_pages); 2948 void btrfs_get_block_group_info(struct list_head *groups_list, 2949 struct btrfs_ioctl_space_info *space); 2950 void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, 2951 struct btrfs_ioctl_balance_args *bargs); 2952 2953 /* file.c */ 2954 int __init btrfs_auto_defrag_init(void); 2955 void __cold btrfs_auto_defrag_exit(void); 2956 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, 2957 struct btrfs_inode *inode); 2958 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); 2959 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info); 2960 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); 2961 void btrfs_drop_extent_cache(struct btrfs_inode *inode, u64 start, u64 end, 2962 int skip_pinned); 2963 extern const struct file_operations btrfs_file_operations; 2964 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, 2965 struct btrfs_root *root, struct inode *inode, 2966 struct btrfs_path *path, u64 start, u64 end, 2967 u64 *drop_end, int drop_cache, 2968 int replace_extent, 2969 u32 extent_item_size, 2970 int *key_inserted); 2971 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 2972 struct btrfs_root *root, struct inode *inode, u64 start, 2973 u64 end, int drop_cache); 2974 int btrfs_punch_hole_range(struct inode *inode, struct btrfs_path *path, 2975 const u64 start, const u64 end, 2976 struct btrfs_clone_extent_info *clone_info, 2977 struct btrfs_trans_handle **trans_out); 2978 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 2979 struct btrfs_inode *inode, u64 start, u64 end); 2980 int btrfs_release_file(struct inode *inode, struct file *file); 2981 int btrfs_dirty_pages(struct inode *inode, struct page **pages, 2982 size_t num_pages, loff_t pos, size_t write_bytes, 2983 struct extent_state **cached); 2984 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end); 2985 2986 /* tree-defrag.c */ 2987 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 2988 struct btrfs_root *root); 2989 2990 /* super.c */ 2991 int btrfs_parse_options(struct btrfs_fs_info *info, char *options, 2992 unsigned long new_flags); 2993 int btrfs_sync_fs(struct super_block *sb, int wait); 2994 char *btrfs_get_subvol_name_from_objectid(struct btrfs_fs_info *fs_info, 2995 u64 subvol_objectid); 2996 2997 static inline __printf(2, 3) __cold 2998 void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 2999 { 3000 } 3001 3002 #ifdef CONFIG_PRINTK 3003 __printf(2, 3) 3004 __cold 3005 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); 3006 #else 3007 #define btrfs_printk(fs_info, fmt, args...) \ 3008 btrfs_no_printk(fs_info, fmt, ##args) 3009 #endif 3010 3011 #define btrfs_emerg(fs_info, fmt, args...) \ 3012 btrfs_printk(fs_info, KERN_EMERG fmt, ##args) 3013 #define btrfs_alert(fs_info, fmt, args...) \ 3014 btrfs_printk(fs_info, KERN_ALERT fmt, ##args) 3015 #define btrfs_crit(fs_info, fmt, args...) \ 3016 btrfs_printk(fs_info, KERN_CRIT fmt, ##args) 3017 #define btrfs_err(fs_info, fmt, args...) \ 3018 btrfs_printk(fs_info, KERN_ERR fmt, ##args) 3019 #define btrfs_warn(fs_info, fmt, args...) \ 3020 btrfs_printk(fs_info, KERN_WARNING fmt, ##args) 3021 #define btrfs_notice(fs_info, fmt, args...) \ 3022 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) 3023 #define btrfs_info(fs_info, fmt, args...) \ 3024 btrfs_printk(fs_info, KERN_INFO fmt, ##args) 3025 3026 /* 3027 * Wrappers that use printk_in_rcu 3028 */ 3029 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \ 3030 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3031 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \ 3032 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3033 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \ 3034 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3035 #define btrfs_err_in_rcu(fs_info, fmt, args...) \ 3036 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args) 3037 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \ 3038 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3039 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \ 3040 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3041 #define btrfs_info_in_rcu(fs_info, fmt, args...) \ 3042 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args) 3043 3044 /* 3045 * Wrappers that use a ratelimited printk_in_rcu 3046 */ 3047 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \ 3048 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3049 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \ 3050 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3051 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \ 3052 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3053 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \ 3054 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) 3055 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \ 3056 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3057 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \ 3058 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3059 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \ 3060 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) 3061 3062 /* 3063 * Wrappers that use a ratelimited printk 3064 */ 3065 #define btrfs_emerg_rl(fs_info, fmt, args...) \ 3066 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args) 3067 #define btrfs_alert_rl(fs_info, fmt, args...) \ 3068 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args) 3069 #define btrfs_crit_rl(fs_info, fmt, args...) \ 3070 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args) 3071 #define btrfs_err_rl(fs_info, fmt, args...) \ 3072 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args) 3073 #define btrfs_warn_rl(fs_info, fmt, args...) \ 3074 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args) 3075 #define btrfs_notice_rl(fs_info, fmt, args...) \ 3076 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args) 3077 #define btrfs_info_rl(fs_info, fmt, args...) \ 3078 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args) 3079 3080 #if defined(CONFIG_DYNAMIC_DEBUG) 3081 #define btrfs_debug(fs_info, fmt, args...) \ 3082 _dynamic_func_call_no_desc(fmt, btrfs_printk, \ 3083 fs_info, KERN_DEBUG fmt, ##args) 3084 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3085 _dynamic_func_call_no_desc(fmt, btrfs_printk_in_rcu, \ 3086 fs_info, KERN_DEBUG fmt, ##args) 3087 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3088 _dynamic_func_call_no_desc(fmt, btrfs_printk_rl_in_rcu, \ 3089 fs_info, KERN_DEBUG fmt, ##args) 3090 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3091 _dynamic_func_call_no_desc(fmt, btrfs_printk_ratelimited, \ 3092 fs_info, KERN_DEBUG fmt, ##args) 3093 #elif defined(DEBUG) 3094 #define btrfs_debug(fs_info, fmt, args...) \ 3095 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) 3096 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3097 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3098 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3099 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3100 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3101 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args) 3102 #else 3103 #define btrfs_debug(fs_info, fmt, args...) \ 3104 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) 3105 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3106 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3107 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3108 btrfs_no_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3109 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3110 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args) 3111 #endif 3112 3113 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \ 3114 do { \ 3115 rcu_read_lock(); \ 3116 btrfs_printk(fs_info, fmt, ##args); \ 3117 rcu_read_unlock(); \ 3118 } while (0) 3119 3120 #define btrfs_no_printk_in_rcu(fs_info, fmt, args...) \ 3121 do { \ 3122 rcu_read_lock(); \ 3123 btrfs_no_printk(fs_info, fmt, ##args); \ 3124 rcu_read_unlock(); \ 3125 } while (0) 3126 3127 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \ 3128 do { \ 3129 static DEFINE_RATELIMIT_STATE(_rs, \ 3130 DEFAULT_RATELIMIT_INTERVAL, \ 3131 DEFAULT_RATELIMIT_BURST); \ 3132 if (__ratelimit(&_rs)) \ 3133 btrfs_printk(fs_info, fmt, ##args); \ 3134 } while (0) 3135 3136 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ 3137 do { \ 3138 rcu_read_lock(); \ 3139 btrfs_printk_ratelimited(fs_info, fmt, ##args); \ 3140 rcu_read_unlock(); \ 3141 } while (0) 3142 3143 #ifdef CONFIG_BTRFS_ASSERT 3144 __cold __noreturn 3145 static inline void assertfail(const char *expr, const char *file, int line) 3146 { 3147 pr_err("assertion failed: %s, in %s:%d\n", expr, file, line); 3148 BUG(); 3149 } 3150 3151 #define ASSERT(expr) \ 3152 (likely(expr) ? (void)0 : assertfail(#expr, __FILE__, __LINE__)) 3153 3154 #else 3155 static inline void assertfail(const char *expr, const char* file, int line) { } 3156 #define ASSERT(expr) (void)(expr) 3157 #endif 3158 3159 /* 3160 * Use that for functions that are conditionally exported for sanity tests but 3161 * otherwise static 3162 */ 3163 #ifndef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3164 #define EXPORT_FOR_TESTS static 3165 #else 3166 #define EXPORT_FOR_TESTS 3167 #endif 3168 3169 __cold 3170 static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info) 3171 { 3172 btrfs_err(fs_info, 3173 "Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel"); 3174 } 3175 3176 __printf(5, 6) 3177 __cold 3178 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 3179 unsigned int line, int errno, const char *fmt, ...); 3180 3181 const char * __attribute_const__ btrfs_decode_error(int errno); 3182 3183 __cold 3184 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 3185 const char *function, 3186 unsigned int line, int errno); 3187 3188 /* 3189 * Call btrfs_abort_transaction as early as possible when an error condition is 3190 * detected, that way the exact line number is reported. 3191 */ 3192 #define btrfs_abort_transaction(trans, errno) \ 3193 do { \ 3194 /* Report first abort since mount */ \ 3195 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \ 3196 &((trans)->fs_info->fs_state))) { \ 3197 if ((errno) != -EIO) { \ 3198 WARN(1, KERN_DEBUG \ 3199 "BTRFS: Transaction aborted (error %d)\n", \ 3200 (errno)); \ 3201 } else { \ 3202 btrfs_debug((trans)->fs_info, \ 3203 "Transaction aborted (error %d)", \ 3204 (errno)); \ 3205 } \ 3206 } \ 3207 __btrfs_abort_transaction((trans), __func__, \ 3208 __LINE__, (errno)); \ 3209 } while (0) 3210 3211 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \ 3212 do { \ 3213 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \ 3214 (errno), fmt, ##args); \ 3215 } while (0) 3216 3217 __printf(5, 6) 3218 __cold 3219 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3220 unsigned int line, int errno, const char *fmt, ...); 3221 /* 3222 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic 3223 * will panic(). Otherwise we BUG() here. 3224 */ 3225 #define btrfs_panic(fs_info, errno, fmt, args...) \ 3226 do { \ 3227 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \ 3228 BUG(); \ 3229 } while (0) 3230 3231 3232 /* compatibility and incompatibility defines */ 3233 3234 #define btrfs_set_fs_incompat(__fs_info, opt) \ 3235 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \ 3236 #opt) 3237 3238 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, 3239 u64 flag, const char* name) 3240 { 3241 struct btrfs_super_block *disk_super; 3242 u64 features; 3243 3244 disk_super = fs_info->super_copy; 3245 features = btrfs_super_incompat_flags(disk_super); 3246 if (!(features & flag)) { 3247 spin_lock(&fs_info->super_lock); 3248 features = btrfs_super_incompat_flags(disk_super); 3249 if (!(features & flag)) { 3250 features |= flag; 3251 btrfs_set_super_incompat_flags(disk_super, features); 3252 btrfs_info(fs_info, 3253 "setting incompat feature flag for %s (0x%llx)", 3254 name, flag); 3255 } 3256 spin_unlock(&fs_info->super_lock); 3257 } 3258 } 3259 3260 #define btrfs_clear_fs_incompat(__fs_info, opt) \ 3261 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, \ 3262 #opt) 3263 3264 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, 3265 u64 flag, const char* name) 3266 { 3267 struct btrfs_super_block *disk_super; 3268 u64 features; 3269 3270 disk_super = fs_info->super_copy; 3271 features = btrfs_super_incompat_flags(disk_super); 3272 if (features & flag) { 3273 spin_lock(&fs_info->super_lock); 3274 features = btrfs_super_incompat_flags(disk_super); 3275 if (features & flag) { 3276 features &= ~flag; 3277 btrfs_set_super_incompat_flags(disk_super, features); 3278 btrfs_info(fs_info, 3279 "clearing incompat feature flag for %s (0x%llx)", 3280 name, flag); 3281 } 3282 spin_unlock(&fs_info->super_lock); 3283 } 3284 } 3285 3286 #define btrfs_fs_incompat(fs_info, opt) \ 3287 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3288 3289 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag) 3290 { 3291 struct btrfs_super_block *disk_super; 3292 disk_super = fs_info->super_copy; 3293 return !!(btrfs_super_incompat_flags(disk_super) & flag); 3294 } 3295 3296 #define btrfs_set_fs_compat_ro(__fs_info, opt) \ 3297 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \ 3298 #opt) 3299 3300 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, 3301 u64 flag, const char *name) 3302 { 3303 struct btrfs_super_block *disk_super; 3304 u64 features; 3305 3306 disk_super = fs_info->super_copy; 3307 features = btrfs_super_compat_ro_flags(disk_super); 3308 if (!(features & flag)) { 3309 spin_lock(&fs_info->super_lock); 3310 features = btrfs_super_compat_ro_flags(disk_super); 3311 if (!(features & flag)) { 3312 features |= flag; 3313 btrfs_set_super_compat_ro_flags(disk_super, features); 3314 btrfs_info(fs_info, 3315 "setting compat-ro feature flag for %s (0x%llx)", 3316 name, flag); 3317 } 3318 spin_unlock(&fs_info->super_lock); 3319 } 3320 } 3321 3322 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ 3323 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, \ 3324 #opt) 3325 3326 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, 3327 u64 flag, const char *name) 3328 { 3329 struct btrfs_super_block *disk_super; 3330 u64 features; 3331 3332 disk_super = fs_info->super_copy; 3333 features = btrfs_super_compat_ro_flags(disk_super); 3334 if (features & flag) { 3335 spin_lock(&fs_info->super_lock); 3336 features = btrfs_super_compat_ro_flags(disk_super); 3337 if (features & flag) { 3338 features &= ~flag; 3339 btrfs_set_super_compat_ro_flags(disk_super, features); 3340 btrfs_info(fs_info, 3341 "clearing compat-ro feature flag for %s (0x%llx)", 3342 name, flag); 3343 } 3344 spin_unlock(&fs_info->super_lock); 3345 } 3346 } 3347 3348 #define btrfs_fs_compat_ro(fs_info, opt) \ 3349 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3350 3351 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag) 3352 { 3353 struct btrfs_super_block *disk_super; 3354 disk_super = fs_info->super_copy; 3355 return !!(btrfs_super_compat_ro_flags(disk_super) & flag); 3356 } 3357 3358 /* acl.c */ 3359 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 3360 struct posix_acl *btrfs_get_acl(struct inode *inode, int type); 3361 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); 3362 int btrfs_init_acl(struct btrfs_trans_handle *trans, 3363 struct inode *inode, struct inode *dir); 3364 #else 3365 #define btrfs_get_acl NULL 3366 #define btrfs_set_acl NULL 3367 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, 3368 struct inode *inode, struct inode *dir) 3369 { 3370 return 0; 3371 } 3372 #endif 3373 3374 /* relocation.c */ 3375 int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start); 3376 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 3377 struct btrfs_root *root); 3378 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 3379 struct btrfs_root *root); 3380 int btrfs_recover_relocation(struct btrfs_root *root); 3381 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 3382 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 3383 struct btrfs_root *root, struct extent_buffer *buf, 3384 struct extent_buffer *cow); 3385 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 3386 u64 *bytes_to_reserve); 3387 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 3388 struct btrfs_pending_snapshot *pending); 3389 int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info); 3390 struct btrfs_root *find_reloc_root(struct btrfs_fs_info *fs_info, 3391 u64 bytenr); 3392 int btrfs_should_ignore_reloc_root(struct btrfs_root *root); 3393 3394 /* scrub.c */ 3395 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, 3396 u64 end, struct btrfs_scrub_progress *progress, 3397 int readonly, int is_dev_replace); 3398 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info); 3399 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info); 3400 int btrfs_scrub_cancel(struct btrfs_fs_info *info); 3401 int btrfs_scrub_cancel_dev(struct btrfs_device *dev); 3402 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid, 3403 struct btrfs_scrub_progress *progress); 3404 static inline void btrfs_init_full_stripe_locks_tree( 3405 struct btrfs_full_stripe_locks_tree *locks_root) 3406 { 3407 locks_root->root = RB_ROOT; 3408 mutex_init(&locks_root->lock); 3409 } 3410 3411 /* dev-replace.c */ 3412 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info); 3413 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info); 3414 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount); 3415 3416 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) 3417 { 3418 btrfs_bio_counter_sub(fs_info, 1); 3419 } 3420 3421 /* reada.c */ 3422 struct reada_control { 3423 struct btrfs_fs_info *fs_info; /* tree to prefetch */ 3424 struct btrfs_key key_start; 3425 struct btrfs_key key_end; /* exclusive */ 3426 atomic_t elems; 3427 struct kref refcnt; 3428 wait_queue_head_t wait; 3429 }; 3430 struct reada_control *btrfs_reada_add(struct btrfs_root *root, 3431 struct btrfs_key *start, struct btrfs_key *end); 3432 int btrfs_reada_wait(void *handle); 3433 void btrfs_reada_detach(void *handle); 3434 int btree_readahead_hook(struct extent_buffer *eb, int err); 3435 3436 static inline int is_fstree(u64 rootid) 3437 { 3438 if (rootid == BTRFS_FS_TREE_OBJECTID || 3439 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID && 3440 !btrfs_qgroup_level(rootid))) 3441 return 1; 3442 return 0; 3443 } 3444 3445 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) 3446 { 3447 return signal_pending(current); 3448 } 3449 3450 #define in_range(b, first, len) ((b) >= (first) && (b) < (first) + (len)) 3451 3452 /* Sanity test specific functions */ 3453 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3454 void btrfs_test_inode_set_ops(struct inode *inode); 3455 void btrfs_test_destroy_inode(struct inode *inode); 3456 3457 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) 3458 { 3459 return test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); 3460 } 3461 #else 3462 static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info) 3463 { 3464 return 0; 3465 } 3466 #endif 3467 3468 #endif 3469