1 /* 2 * Copyright (C) 2007 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #ifndef __BTRFS_CTREE__ 20 #define __BTRFS_CTREE__ 21 22 #include <linux/mm.h> 23 #include <linux/highmem.h> 24 #include <linux/fs.h> 25 #include <linux/rwsem.h> 26 #include <linux/semaphore.h> 27 #include <linux/completion.h> 28 #include <linux/backing-dev.h> 29 #include <linux/wait.h> 30 #include <linux/slab.h> 31 #include <linux/kobject.h> 32 #include <trace/events/btrfs.h> 33 #include <asm/kmap_types.h> 34 #include <linux/pagemap.h> 35 #include <linux/btrfs.h> 36 #include <linux/btrfs_tree.h> 37 #include <linux/workqueue.h> 38 #include <linux/security.h> 39 #include <linux/sizes.h> 40 #include "extent_io.h" 41 #include "extent_map.h" 42 #include "async-thread.h" 43 44 struct btrfs_trans_handle; 45 struct btrfs_transaction; 46 struct btrfs_pending_snapshot; 47 extern struct kmem_cache *btrfs_trans_handle_cachep; 48 extern struct kmem_cache *btrfs_transaction_cachep; 49 extern struct kmem_cache *btrfs_bit_radix_cachep; 50 extern struct kmem_cache *btrfs_path_cachep; 51 extern struct kmem_cache *btrfs_free_space_cachep; 52 struct btrfs_ordered_sum; 53 54 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 55 #define STATIC noinline 56 #else 57 #define STATIC static noinline 58 #endif 59 60 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */ 61 62 #define BTRFS_MAX_MIRRORS 3 63 64 #define BTRFS_MAX_LEVEL 8 65 66 #define BTRFS_COMPAT_EXTENT_TREE_V0 67 68 /* 69 * the max metadata block size. This limit is somewhat artificial, 70 * but the memmove costs go through the roof for larger blocks. 71 */ 72 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536 73 74 /* 75 * we can actually store much bigger names, but lets not confuse the rest 76 * of linux 77 */ 78 #define BTRFS_NAME_LEN 255 79 80 /* 81 * Theoretical limit is larger, but we keep this down to a sane 82 * value. That should limit greatly the possibility of collisions on 83 * inode ref items. 84 */ 85 #define BTRFS_LINK_MAX 65535U 86 87 static const int btrfs_csum_sizes[] = { 4 }; 88 89 /* four bytes for CRC32 */ 90 #define BTRFS_EMPTY_DIR_SIZE 0 91 92 /* specific to btrfs_map_block(), therefore not in include/linux/blk_types.h */ 93 #define REQ_GET_READ_MIRRORS (1 << 30) 94 95 /* ioprio of readahead is set to idle */ 96 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) 97 98 #define BTRFS_DIRTY_METADATA_THRESH SZ_32M 99 100 #define BTRFS_MAX_EXTENT_SIZE SZ_128M 101 102 struct btrfs_mapping_tree { 103 struct extent_map_tree map_tree; 104 }; 105 106 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 107 { 108 BUG_ON(num_stripes == 0); 109 return sizeof(struct btrfs_chunk) + 110 sizeof(struct btrfs_stripe) * (num_stripes - 1); 111 } 112 113 /* 114 * File system states 115 */ 116 #define BTRFS_FS_STATE_ERROR 0 117 #define BTRFS_FS_STATE_REMOUNTING 1 118 #define BTRFS_FS_STATE_TRANS_ABORTED 2 119 #define BTRFS_FS_STATE_DEV_REPLACING 3 120 121 #define BTRFS_BACKREF_REV_MAX 256 122 #define BTRFS_BACKREF_REV_SHIFT 56 123 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 124 BTRFS_BACKREF_REV_SHIFT) 125 126 #define BTRFS_OLD_BACKREF_REV 0 127 #define BTRFS_MIXED_BACKREF_REV 1 128 129 /* 130 * every tree block (leaf or node) starts with this header. 131 */ 132 struct btrfs_header { 133 /* these first four must match the super block */ 134 u8 csum[BTRFS_CSUM_SIZE]; 135 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 136 __le64 bytenr; /* which block this node is supposed to live in */ 137 __le64 flags; 138 139 /* allowed to be different from the super from here on down */ 140 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 141 __le64 generation; 142 __le64 owner; 143 __le32 nritems; 144 u8 level; 145 } __attribute__ ((__packed__)); 146 147 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ 148 sizeof(struct btrfs_header)) / \ 149 sizeof(struct btrfs_key_ptr)) 150 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) 151 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize)) 152 #define BTRFS_FILE_EXTENT_INLINE_DATA_START \ 153 (offsetof(struct btrfs_file_extent_item, disk_bytenr)) 154 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 155 sizeof(struct btrfs_item) - \ 156 BTRFS_FILE_EXTENT_INLINE_DATA_START) 157 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 158 sizeof(struct btrfs_item) -\ 159 sizeof(struct btrfs_dir_item)) 160 161 162 /* 163 * this is a very generous portion of the super block, giving us 164 * room to translate 14 chunks with 3 stripes each. 165 */ 166 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 167 168 /* 169 * just in case we somehow lose the roots and are not able to mount, 170 * we store an array of the roots from previous transactions 171 * in the super. 172 */ 173 #define BTRFS_NUM_BACKUP_ROOTS 4 174 struct btrfs_root_backup { 175 __le64 tree_root; 176 __le64 tree_root_gen; 177 178 __le64 chunk_root; 179 __le64 chunk_root_gen; 180 181 __le64 extent_root; 182 __le64 extent_root_gen; 183 184 __le64 fs_root; 185 __le64 fs_root_gen; 186 187 __le64 dev_root; 188 __le64 dev_root_gen; 189 190 __le64 csum_root; 191 __le64 csum_root_gen; 192 193 __le64 total_bytes; 194 __le64 bytes_used; 195 __le64 num_devices; 196 /* future */ 197 __le64 unused_64[4]; 198 199 u8 tree_root_level; 200 u8 chunk_root_level; 201 u8 extent_root_level; 202 u8 fs_root_level; 203 u8 dev_root_level; 204 u8 csum_root_level; 205 /* future and to align */ 206 u8 unused_8[10]; 207 } __attribute__ ((__packed__)); 208 209 /* 210 * the super block basically lists the main trees of the FS 211 * it currently lacks any block count etc etc 212 */ 213 struct btrfs_super_block { 214 u8 csum[BTRFS_CSUM_SIZE]; 215 /* the first 4 fields must match struct btrfs_header */ 216 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 217 __le64 bytenr; /* this block number */ 218 __le64 flags; 219 220 /* allowed to be different from the btrfs_header from here own down */ 221 __le64 magic; 222 __le64 generation; 223 __le64 root; 224 __le64 chunk_root; 225 __le64 log_root; 226 227 /* this will help find the new super based on the log root */ 228 __le64 log_root_transid; 229 __le64 total_bytes; 230 __le64 bytes_used; 231 __le64 root_dir_objectid; 232 __le64 num_devices; 233 __le32 sectorsize; 234 __le32 nodesize; 235 __le32 __unused_leafsize; 236 __le32 stripesize; 237 __le32 sys_chunk_array_size; 238 __le64 chunk_root_generation; 239 __le64 compat_flags; 240 __le64 compat_ro_flags; 241 __le64 incompat_flags; 242 __le16 csum_type; 243 u8 root_level; 244 u8 chunk_root_level; 245 u8 log_root_level; 246 struct btrfs_dev_item dev_item; 247 248 char label[BTRFS_LABEL_SIZE]; 249 250 __le64 cache_generation; 251 __le64 uuid_tree_generation; 252 253 /* future expansion */ 254 __le64 reserved[30]; 255 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 256 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; 257 } __attribute__ ((__packed__)); 258 259 /* 260 * Compat flags that we support. If any incompat flags are set other than the 261 * ones specified below then we will fail to mount 262 */ 263 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 264 #define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL 265 #define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL 266 267 #define BTRFS_FEATURE_COMPAT_RO_SUPP \ 268 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE) 269 270 #define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL 271 #define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL 272 273 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 274 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 275 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 276 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 277 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ 278 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ 279 BTRFS_FEATURE_INCOMPAT_RAID56 | \ 280 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ 281 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \ 282 BTRFS_FEATURE_INCOMPAT_NO_HOLES) 283 284 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET \ 285 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF) 286 #define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL 287 288 /* 289 * A leaf is full of items. offset and size tell us where to find 290 * the item in the leaf (relative to the start of the data area) 291 */ 292 struct btrfs_item { 293 struct btrfs_disk_key key; 294 __le32 offset; 295 __le32 size; 296 } __attribute__ ((__packed__)); 297 298 /* 299 * leaves have an item area and a data area: 300 * [item0, item1....itemN] [free space] [dataN...data1, data0] 301 * 302 * The data is separate from the items to get the keys closer together 303 * during searches. 304 */ 305 struct btrfs_leaf { 306 struct btrfs_header header; 307 struct btrfs_item items[]; 308 } __attribute__ ((__packed__)); 309 310 /* 311 * all non-leaf blocks are nodes, they hold only keys and pointers to 312 * other blocks 313 */ 314 struct btrfs_key_ptr { 315 struct btrfs_disk_key key; 316 __le64 blockptr; 317 __le64 generation; 318 } __attribute__ ((__packed__)); 319 320 struct btrfs_node { 321 struct btrfs_header header; 322 struct btrfs_key_ptr ptrs[]; 323 } __attribute__ ((__packed__)); 324 325 /* 326 * btrfs_paths remember the path taken from the root down to the leaf. 327 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 328 * to any other levels that are present. 329 * 330 * The slots array records the index of the item or block pointer 331 * used while walking the tree. 332 */ 333 enum { READA_NONE = 0, READA_BACK, READA_FORWARD }; 334 struct btrfs_path { 335 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 336 int slots[BTRFS_MAX_LEVEL]; 337 /* if there is real range locking, this locks field will change */ 338 u8 locks[BTRFS_MAX_LEVEL]; 339 u8 reada; 340 /* keep some upper locks as we walk down */ 341 u8 lowest_level; 342 343 /* 344 * set by btrfs_split_item, tells search_slot to keep all locks 345 * and to force calls to keep space in the nodes 346 */ 347 unsigned int search_for_split:1; 348 unsigned int keep_locks:1; 349 unsigned int skip_locking:1; 350 unsigned int leave_spinning:1; 351 unsigned int search_commit_root:1; 352 unsigned int need_commit_sem:1; 353 unsigned int skip_release_on_error:1; 354 }; 355 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \ 356 sizeof(struct btrfs_item)) 357 struct btrfs_dev_replace { 358 u64 replace_state; /* see #define above */ 359 u64 time_started; /* seconds since 1-Jan-1970 */ 360 u64 time_stopped; /* seconds since 1-Jan-1970 */ 361 atomic64_t num_write_errors; 362 atomic64_t num_uncorrectable_read_errors; 363 364 u64 cursor_left; 365 u64 committed_cursor_left; 366 u64 cursor_left_last_write_of_item; 367 u64 cursor_right; 368 369 u64 cont_reading_from_srcdev_mode; /* see #define above */ 370 371 int is_valid; 372 int item_needs_writeback; 373 struct btrfs_device *srcdev; 374 struct btrfs_device *tgtdev; 375 376 pid_t lock_owner; 377 atomic_t nesting_level; 378 struct mutex lock_finishing_cancel_unmount; 379 rwlock_t lock; 380 atomic_t read_locks; 381 atomic_t blocking_readers; 382 wait_queue_head_t read_lock_wq; 383 384 struct btrfs_scrub_progress scrub_progress; 385 }; 386 387 /* For raid type sysfs entries */ 388 struct raid_kobject { 389 int raid_type; 390 struct kobject kobj; 391 }; 392 393 struct btrfs_space_info { 394 spinlock_t lock; 395 396 u64 total_bytes; /* total bytes in the space, 397 this doesn't take mirrors into account */ 398 u64 bytes_used; /* total bytes used, 399 this doesn't take mirrors into account */ 400 u64 bytes_pinned; /* total bytes pinned, will be freed when the 401 transaction finishes */ 402 u64 bytes_reserved; /* total bytes the allocator has reserved for 403 current allocations */ 404 u64 bytes_may_use; /* number of bytes that may be used for 405 delalloc/allocations */ 406 u64 bytes_readonly; /* total bytes that are read only */ 407 408 u64 max_extent_size; /* This will hold the maximum extent size of 409 the space info if we had an ENOSPC in the 410 allocator. */ 411 412 unsigned int full:1; /* indicates that we cannot allocate any more 413 chunks for this space */ 414 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ 415 416 unsigned int flush:1; /* set if we are trying to make space */ 417 418 unsigned int force_alloc; /* set if we need to force a chunk 419 alloc for this space */ 420 421 u64 disk_used; /* total bytes used on disk */ 422 u64 disk_total; /* total bytes on disk, takes mirrors into 423 account */ 424 425 u64 flags; 426 427 /* 428 * bytes_pinned is kept in line with what is actually pinned, as in 429 * we've called update_block_group and dropped the bytes_used counter 430 * and increased the bytes_pinned counter. However this means that 431 * bytes_pinned does not reflect the bytes that will be pinned once the 432 * delayed refs are flushed, so this counter is inc'ed every time we 433 * call btrfs_free_extent so it is a realtime count of what will be 434 * freed once the transaction is committed. It will be zeroed every 435 * time the transaction commits. 436 */ 437 struct percpu_counter total_bytes_pinned; 438 439 struct list_head list; 440 /* Protected by the spinlock 'lock'. */ 441 struct list_head ro_bgs; 442 443 struct rw_semaphore groups_sem; 444 /* for block groups in our same type */ 445 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 446 wait_queue_head_t wait; 447 448 struct kobject kobj; 449 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; 450 }; 451 452 #define BTRFS_BLOCK_RSV_GLOBAL 1 453 #define BTRFS_BLOCK_RSV_DELALLOC 2 454 #define BTRFS_BLOCK_RSV_TRANS 3 455 #define BTRFS_BLOCK_RSV_CHUNK 4 456 #define BTRFS_BLOCK_RSV_DELOPS 5 457 #define BTRFS_BLOCK_RSV_EMPTY 6 458 #define BTRFS_BLOCK_RSV_TEMP 7 459 460 struct btrfs_block_rsv { 461 u64 size; 462 u64 reserved; 463 struct btrfs_space_info *space_info; 464 spinlock_t lock; 465 unsigned short full; 466 unsigned short type; 467 unsigned short failfast; 468 }; 469 470 /* 471 * free clusters are used to claim free space in relatively large chunks, 472 * allowing us to do less seeky writes. They are used for all metadata 473 * allocations and data allocations in ssd mode. 474 */ 475 struct btrfs_free_cluster { 476 spinlock_t lock; 477 spinlock_t refill_lock; 478 struct rb_root root; 479 480 /* largest extent in this cluster */ 481 u64 max_size; 482 483 /* first extent starting offset */ 484 u64 window_start; 485 486 /* We did a full search and couldn't create a cluster */ 487 bool fragmented; 488 489 struct btrfs_block_group_cache *block_group; 490 /* 491 * when a cluster is allocated from a block group, we put the 492 * cluster onto a list in the block group so that it can 493 * be freed before the block group is freed. 494 */ 495 struct list_head block_group_list; 496 }; 497 498 enum btrfs_caching_type { 499 BTRFS_CACHE_NO = 0, 500 BTRFS_CACHE_STARTED = 1, 501 BTRFS_CACHE_FAST = 2, 502 BTRFS_CACHE_FINISHED = 3, 503 BTRFS_CACHE_ERROR = 4, 504 }; 505 506 enum btrfs_disk_cache_state { 507 BTRFS_DC_WRITTEN = 0, 508 BTRFS_DC_ERROR = 1, 509 BTRFS_DC_CLEAR = 2, 510 BTRFS_DC_SETUP = 3, 511 }; 512 513 struct btrfs_caching_control { 514 struct list_head list; 515 struct mutex mutex; 516 wait_queue_head_t wait; 517 struct btrfs_work work; 518 struct btrfs_block_group_cache *block_group; 519 u64 progress; 520 atomic_t count; 521 }; 522 523 /* Once caching_thread() finds this much free space, it will wake up waiters. */ 524 #define CACHING_CTL_WAKE_UP (1024 * 1024 * 2) 525 526 struct btrfs_io_ctl { 527 void *cur, *orig; 528 struct page *page; 529 struct page **pages; 530 struct btrfs_root *root; 531 struct inode *inode; 532 unsigned long size; 533 int index; 534 int num_pages; 535 int entries; 536 int bitmaps; 537 unsigned check_crcs:1; 538 }; 539 540 struct btrfs_block_group_cache { 541 struct btrfs_key key; 542 struct btrfs_block_group_item item; 543 struct btrfs_fs_info *fs_info; 544 struct inode *inode; 545 spinlock_t lock; 546 u64 pinned; 547 u64 reserved; 548 u64 delalloc_bytes; 549 u64 bytes_super; 550 u64 flags; 551 u64 cache_generation; 552 u32 sectorsize; 553 554 /* 555 * If the free space extent count exceeds this number, convert the block 556 * group to bitmaps. 557 */ 558 u32 bitmap_high_thresh; 559 560 /* 561 * If the free space extent count drops below this number, convert the 562 * block group back to extents. 563 */ 564 u32 bitmap_low_thresh; 565 566 /* 567 * It is just used for the delayed data space allocation because 568 * only the data space allocation and the relative metadata update 569 * can be done cross the transaction. 570 */ 571 struct rw_semaphore data_rwsem; 572 573 /* for raid56, this is a full stripe, without parity */ 574 unsigned long full_stripe_len; 575 576 unsigned int ro; 577 unsigned int iref:1; 578 unsigned int has_caching_ctl:1; 579 unsigned int removed:1; 580 581 int disk_cache_state; 582 583 /* cache tracking stuff */ 584 int cached; 585 struct btrfs_caching_control *caching_ctl; 586 u64 last_byte_to_unpin; 587 588 struct btrfs_space_info *space_info; 589 590 /* free space cache stuff */ 591 struct btrfs_free_space_ctl *free_space_ctl; 592 593 /* block group cache stuff */ 594 struct rb_node cache_node; 595 596 /* for block groups in the same raid type */ 597 struct list_head list; 598 599 /* usage count */ 600 atomic_t count; 601 602 /* List of struct btrfs_free_clusters for this block group. 603 * Today it will only have one thing on it, but that may change 604 */ 605 struct list_head cluster_list; 606 607 /* For delayed block group creation or deletion of empty block groups */ 608 struct list_head bg_list; 609 610 /* For read-only block groups */ 611 struct list_head ro_list; 612 613 atomic_t trimming; 614 615 /* For dirty block groups */ 616 struct list_head dirty_list; 617 struct list_head io_list; 618 619 struct btrfs_io_ctl io_ctl; 620 621 /* 622 * Incremented when doing extent allocations and holding a read lock 623 * on the space_info's groups_sem semaphore. 624 * Decremented when an ordered extent that represents an IO against this 625 * block group's range is created (after it's added to its inode's 626 * root's list of ordered extents) or immediately after the allocation 627 * if it's a metadata extent or fallocate extent (for these cases we 628 * don't create ordered extents). 629 */ 630 atomic_t reservations; 631 632 /* 633 * Incremented while holding the spinlock *lock* by a task checking if 634 * it can perform a nocow write (incremented if the value for the *ro* 635 * field is 0). Decremented by such tasks once they create an ordered 636 * extent or before that if some error happens before reaching that step. 637 * This is to prevent races between block group relocation and nocow 638 * writes through direct IO. 639 */ 640 atomic_t nocow_writers; 641 642 /* Lock for free space tree operations. */ 643 struct mutex free_space_lock; 644 645 /* 646 * Does the block group need to be added to the free space tree? 647 * Protected by free_space_lock. 648 */ 649 int needs_free_space; 650 }; 651 652 /* delayed seq elem */ 653 struct seq_list { 654 struct list_head list; 655 u64 seq; 656 }; 657 658 #define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 } 659 660 enum btrfs_orphan_cleanup_state { 661 ORPHAN_CLEANUP_STARTED = 1, 662 ORPHAN_CLEANUP_DONE = 2, 663 }; 664 665 /* used by the raid56 code to lock stripes for read/modify/write */ 666 struct btrfs_stripe_hash { 667 struct list_head hash_list; 668 wait_queue_head_t wait; 669 spinlock_t lock; 670 }; 671 672 /* used by the raid56 code to lock stripes for read/modify/write */ 673 struct btrfs_stripe_hash_table { 674 struct list_head stripe_cache; 675 spinlock_t cache_lock; 676 int cache_size; 677 struct btrfs_stripe_hash table[]; 678 }; 679 680 #define BTRFS_STRIPE_HASH_TABLE_BITS 11 681 682 void btrfs_init_async_reclaim_work(struct work_struct *work); 683 684 /* fs_info */ 685 struct reloc_control; 686 struct btrfs_device; 687 struct btrfs_fs_devices; 688 struct btrfs_balance_control; 689 struct btrfs_delayed_root; 690 struct btrfs_fs_info { 691 u8 fsid[BTRFS_FSID_SIZE]; 692 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 693 struct btrfs_root *extent_root; 694 struct btrfs_root *tree_root; 695 struct btrfs_root *chunk_root; 696 struct btrfs_root *dev_root; 697 struct btrfs_root *fs_root; 698 struct btrfs_root *csum_root; 699 struct btrfs_root *quota_root; 700 struct btrfs_root *uuid_root; 701 struct btrfs_root *free_space_root; 702 703 /* the log root tree is a directory of all the other log roots */ 704 struct btrfs_root *log_root_tree; 705 706 spinlock_t fs_roots_radix_lock; 707 struct radix_tree_root fs_roots_radix; 708 709 /* block group cache stuff */ 710 spinlock_t block_group_cache_lock; 711 u64 first_logical_byte; 712 struct rb_root block_group_cache_tree; 713 714 /* keep track of unallocated space */ 715 spinlock_t free_chunk_lock; 716 u64 free_chunk_space; 717 718 struct extent_io_tree freed_extents[2]; 719 struct extent_io_tree *pinned_extents; 720 721 /* logical->physical extent mapping */ 722 struct btrfs_mapping_tree mapping_tree; 723 724 /* 725 * block reservation for extent, checksum, root tree and 726 * delayed dir index item 727 */ 728 struct btrfs_block_rsv global_block_rsv; 729 /* block reservation for delay allocation */ 730 struct btrfs_block_rsv delalloc_block_rsv; 731 /* block reservation for metadata operations */ 732 struct btrfs_block_rsv trans_block_rsv; 733 /* block reservation for chunk tree */ 734 struct btrfs_block_rsv chunk_block_rsv; 735 /* block reservation for delayed operations */ 736 struct btrfs_block_rsv delayed_block_rsv; 737 738 struct btrfs_block_rsv empty_block_rsv; 739 740 u64 generation; 741 u64 last_trans_committed; 742 u64 avg_delayed_ref_runtime; 743 744 /* 745 * this is updated to the current trans every time a full commit 746 * is required instead of the faster short fsync log commits 747 */ 748 u64 last_trans_log_full_commit; 749 unsigned long mount_opt; 750 /* 751 * Track requests for actions that need to be done during transaction 752 * commit (like for some mount options). 753 */ 754 unsigned long pending_changes; 755 unsigned long compress_type:4; 756 int commit_interval; 757 /* 758 * It is a suggestive number, the read side is safe even it gets a 759 * wrong number because we will write out the data into a regular 760 * extent. The write side(mount/remount) is under ->s_umount lock, 761 * so it is also safe. 762 */ 763 u64 max_inline; 764 /* 765 * Protected by ->chunk_mutex and sb->s_umount. 766 * 767 * The reason that we use two lock to protect it is because only 768 * remount and mount operations can change it and these two operations 769 * are under sb->s_umount, but the read side (chunk allocation) can not 770 * acquire sb->s_umount or the deadlock would happen. So we use two 771 * locks to protect it. On the write side, we must acquire two locks, 772 * and on the read side, we just need acquire one of them. 773 */ 774 u64 alloc_start; 775 struct btrfs_transaction *running_transaction; 776 wait_queue_head_t transaction_throttle; 777 wait_queue_head_t transaction_wait; 778 wait_queue_head_t transaction_blocked_wait; 779 wait_queue_head_t async_submit_wait; 780 781 /* 782 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 783 * when they are updated. 784 * 785 * Because we do not clear the flags for ever, so we needn't use 786 * the lock on the read side. 787 * 788 * We also needn't use the lock when we mount the fs, because 789 * there is no other task which will update the flag. 790 */ 791 spinlock_t super_lock; 792 struct btrfs_super_block *super_copy; 793 struct btrfs_super_block *super_for_commit; 794 struct block_device *__bdev; 795 struct super_block *sb; 796 struct inode *btree_inode; 797 struct backing_dev_info bdi; 798 struct mutex tree_log_mutex; 799 struct mutex transaction_kthread_mutex; 800 struct mutex cleaner_mutex; 801 struct mutex chunk_mutex; 802 struct mutex volume_mutex; 803 804 /* 805 * this is taken to make sure we don't set block groups ro after 806 * the free space cache has been allocated on them 807 */ 808 struct mutex ro_block_group_mutex; 809 810 /* this is used during read/modify/write to make sure 811 * no two ios are trying to mod the same stripe at the same 812 * time 813 */ 814 struct btrfs_stripe_hash_table *stripe_hash_table; 815 816 /* 817 * this protects the ordered operations list only while we are 818 * processing all of the entries on it. This way we make 819 * sure the commit code doesn't find the list temporarily empty 820 * because another function happens to be doing non-waiting preflush 821 * before jumping into the main commit. 822 */ 823 struct mutex ordered_operations_mutex; 824 825 struct rw_semaphore commit_root_sem; 826 827 struct rw_semaphore cleanup_work_sem; 828 829 struct rw_semaphore subvol_sem; 830 struct srcu_struct subvol_srcu; 831 832 spinlock_t trans_lock; 833 /* 834 * the reloc mutex goes with the trans lock, it is taken 835 * during commit to protect us from the relocation code 836 */ 837 struct mutex reloc_mutex; 838 839 struct list_head trans_list; 840 struct list_head dead_roots; 841 struct list_head caching_block_groups; 842 843 spinlock_t delayed_iput_lock; 844 struct list_head delayed_iputs; 845 struct mutex cleaner_delayed_iput_mutex; 846 847 /* this protects tree_mod_seq_list */ 848 spinlock_t tree_mod_seq_lock; 849 atomic64_t tree_mod_seq; 850 struct list_head tree_mod_seq_list; 851 852 /* this protects tree_mod_log */ 853 rwlock_t tree_mod_log_lock; 854 struct rb_root tree_mod_log; 855 856 atomic_t nr_async_submits; 857 atomic_t async_submit_draining; 858 atomic_t nr_async_bios; 859 atomic_t async_delalloc_pages; 860 atomic_t open_ioctl_trans; 861 862 /* 863 * this is used to protect the following list -- ordered_roots. 864 */ 865 spinlock_t ordered_root_lock; 866 867 /* 868 * all fs/file tree roots in which there are data=ordered extents 869 * pending writeback are added into this list. 870 * 871 * these can span multiple transactions and basically include 872 * every dirty data page that isn't from nodatacow 873 */ 874 struct list_head ordered_roots; 875 876 struct mutex delalloc_root_mutex; 877 spinlock_t delalloc_root_lock; 878 /* all fs/file tree roots that have delalloc inodes. */ 879 struct list_head delalloc_roots; 880 881 /* 882 * there is a pool of worker threads for checksumming during writes 883 * and a pool for checksumming after reads. This is because readers 884 * can run with FS locks held, and the writers may be waiting for 885 * those locks. We don't want ordering in the pending list to cause 886 * deadlocks, and so the two are serviced separately. 887 * 888 * A third pool does submit_bio to avoid deadlocking with the other 889 * two 890 */ 891 struct btrfs_workqueue *workers; 892 struct btrfs_workqueue *delalloc_workers; 893 struct btrfs_workqueue *flush_workers; 894 struct btrfs_workqueue *endio_workers; 895 struct btrfs_workqueue *endio_meta_workers; 896 struct btrfs_workqueue *endio_raid56_workers; 897 struct btrfs_workqueue *endio_repair_workers; 898 struct btrfs_workqueue *rmw_workers; 899 struct btrfs_workqueue *endio_meta_write_workers; 900 struct btrfs_workqueue *endio_write_workers; 901 struct btrfs_workqueue *endio_freespace_worker; 902 struct btrfs_workqueue *submit_workers; 903 struct btrfs_workqueue *caching_workers; 904 struct btrfs_workqueue *readahead_workers; 905 906 /* 907 * fixup workers take dirty pages that didn't properly go through 908 * the cow mechanism and make them safe to write. It happens 909 * for the sys_munmap function call path 910 */ 911 struct btrfs_workqueue *fixup_workers; 912 struct btrfs_workqueue *delayed_workers; 913 914 /* the extent workers do delayed refs on the extent allocation tree */ 915 struct btrfs_workqueue *extent_workers; 916 struct task_struct *transaction_kthread; 917 struct task_struct *cleaner_kthread; 918 int thread_pool_size; 919 920 struct kobject *space_info_kobj; 921 int do_barriers; 922 int closing; 923 int log_root_recovering; 924 int open; 925 926 u64 total_pinned; 927 928 /* used to keep from writing metadata until there is a nice batch */ 929 struct percpu_counter dirty_metadata_bytes; 930 struct percpu_counter delalloc_bytes; 931 s32 dirty_metadata_batch; 932 s32 delalloc_batch; 933 934 struct list_head dirty_cowonly_roots; 935 936 struct btrfs_fs_devices *fs_devices; 937 938 /* 939 * the space_info list is almost entirely read only. It only changes 940 * when we add a new raid type to the FS, and that happens 941 * very rarely. RCU is used to protect it. 942 */ 943 struct list_head space_info; 944 945 struct btrfs_space_info *data_sinfo; 946 947 struct reloc_control *reloc_ctl; 948 949 /* data_alloc_cluster is only used in ssd mode */ 950 struct btrfs_free_cluster data_alloc_cluster; 951 952 /* all metadata allocations go through this cluster */ 953 struct btrfs_free_cluster meta_alloc_cluster; 954 955 /* auto defrag inodes go here */ 956 spinlock_t defrag_inodes_lock; 957 struct rb_root defrag_inodes; 958 atomic_t defrag_running; 959 960 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 961 seqlock_t profiles_lock; 962 /* 963 * these three are in extended format (availability of single 964 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other 965 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits) 966 */ 967 u64 avail_data_alloc_bits; 968 u64 avail_metadata_alloc_bits; 969 u64 avail_system_alloc_bits; 970 971 /* restriper state */ 972 spinlock_t balance_lock; 973 struct mutex balance_mutex; 974 atomic_t balance_running; 975 atomic_t balance_pause_req; 976 atomic_t balance_cancel_req; 977 struct btrfs_balance_control *balance_ctl; 978 wait_queue_head_t balance_wait_q; 979 980 unsigned data_chunk_allocations; 981 unsigned metadata_ratio; 982 983 void *bdev_holder; 984 985 /* private scrub information */ 986 struct mutex scrub_lock; 987 atomic_t scrubs_running; 988 atomic_t scrub_pause_req; 989 atomic_t scrubs_paused; 990 atomic_t scrub_cancel_req; 991 wait_queue_head_t scrub_pause_wait; 992 int scrub_workers_refcnt; 993 struct btrfs_workqueue *scrub_workers; 994 struct btrfs_workqueue *scrub_wr_completion_workers; 995 struct btrfs_workqueue *scrub_nocow_workers; 996 struct btrfs_workqueue *scrub_parity_workers; 997 998 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 999 u32 check_integrity_print_mask; 1000 #endif 1001 /* 1002 * quota information 1003 */ 1004 unsigned int quota_enabled:1; 1005 1006 /* 1007 * quota_enabled only changes state after a commit. This holds the 1008 * next state. 1009 */ 1010 unsigned int pending_quota_state:1; 1011 1012 /* is qgroup tracking in a consistent state? */ 1013 u64 qgroup_flags; 1014 1015 /* holds configuration and tracking. Protected by qgroup_lock */ 1016 struct rb_root qgroup_tree; 1017 struct rb_root qgroup_op_tree; 1018 spinlock_t qgroup_lock; 1019 spinlock_t qgroup_op_lock; 1020 atomic_t qgroup_op_seq; 1021 1022 /* 1023 * used to avoid frequently calling ulist_alloc()/ulist_free() 1024 * when doing qgroup accounting, it must be protected by qgroup_lock. 1025 */ 1026 struct ulist *qgroup_ulist; 1027 1028 /* protect user change for quota operations */ 1029 struct mutex qgroup_ioctl_lock; 1030 1031 /* list of dirty qgroups to be written at next commit */ 1032 struct list_head dirty_qgroups; 1033 1034 /* used by qgroup for an efficient tree traversal */ 1035 u64 qgroup_seq; 1036 1037 /* qgroup rescan items */ 1038 struct mutex qgroup_rescan_lock; /* protects the progress item */ 1039 struct btrfs_key qgroup_rescan_progress; 1040 struct btrfs_workqueue *qgroup_rescan_workers; 1041 struct completion qgroup_rescan_completion; 1042 struct btrfs_work qgroup_rescan_work; 1043 1044 /* filesystem state */ 1045 unsigned long fs_state; 1046 1047 struct btrfs_delayed_root *delayed_root; 1048 1049 /* readahead tree */ 1050 spinlock_t reada_lock; 1051 struct radix_tree_root reada_tree; 1052 1053 /* readahead works cnt */ 1054 atomic_t reada_works_cnt; 1055 1056 /* Extent buffer radix tree */ 1057 spinlock_t buffer_lock; 1058 struct radix_tree_root buffer_radix; 1059 1060 /* next backup root to be overwritten */ 1061 int backup_root_index; 1062 1063 int num_tolerated_disk_barrier_failures; 1064 1065 /* device replace state */ 1066 struct btrfs_dev_replace dev_replace; 1067 1068 atomic_t mutually_exclusive_operation_running; 1069 1070 struct percpu_counter bio_counter; 1071 wait_queue_head_t replace_wait; 1072 1073 struct semaphore uuid_tree_rescan_sem; 1074 unsigned int update_uuid_tree_gen:1; 1075 1076 /* Used to reclaim the metadata space in the background. */ 1077 struct work_struct async_reclaim_work; 1078 1079 spinlock_t unused_bgs_lock; 1080 struct list_head unused_bgs; 1081 struct mutex unused_bg_unpin_mutex; 1082 struct mutex delete_unused_bgs_mutex; 1083 1084 /* For btrfs to record security options */ 1085 struct security_mnt_opts security_opts; 1086 1087 /* 1088 * Chunks that can't be freed yet (under a trim/discard operation) 1089 * and will be latter freed. Protected by fs_info->chunk_mutex. 1090 */ 1091 struct list_head pinned_chunks; 1092 1093 int creating_free_space_tree; 1094 }; 1095 1096 struct btrfs_subvolume_writers { 1097 struct percpu_counter counter; 1098 wait_queue_head_t wait; 1099 }; 1100 1101 /* 1102 * The state of btrfs root 1103 */ 1104 /* 1105 * btrfs_record_root_in_trans is a multi-step process, 1106 * and it can race with the balancing code. But the 1107 * race is very small, and only the first time the root 1108 * is added to each transaction. So IN_TRANS_SETUP 1109 * is used to tell us when more checks are required 1110 */ 1111 #define BTRFS_ROOT_IN_TRANS_SETUP 0 1112 #define BTRFS_ROOT_REF_COWS 1 1113 #define BTRFS_ROOT_TRACK_DIRTY 2 1114 #define BTRFS_ROOT_IN_RADIX 3 1115 #define BTRFS_ROOT_DUMMY_ROOT 4 1116 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 5 1117 #define BTRFS_ROOT_DEFRAG_RUNNING 6 1118 #define BTRFS_ROOT_FORCE_COW 7 1119 #define BTRFS_ROOT_MULTI_LOG_TASKS 8 1120 #define BTRFS_ROOT_DIRTY 9 1121 1122 /* 1123 * in ram representation of the tree. extent_root is used for all allocations 1124 * and for the extent tree extent_root root. 1125 */ 1126 struct btrfs_root { 1127 struct extent_buffer *node; 1128 1129 struct extent_buffer *commit_root; 1130 struct btrfs_root *log_root; 1131 struct btrfs_root *reloc_root; 1132 1133 unsigned long state; 1134 struct btrfs_root_item root_item; 1135 struct btrfs_key root_key; 1136 struct btrfs_fs_info *fs_info; 1137 struct extent_io_tree dirty_log_pages; 1138 1139 struct mutex objectid_mutex; 1140 1141 spinlock_t accounting_lock; 1142 struct btrfs_block_rsv *block_rsv; 1143 1144 /* free ino cache stuff */ 1145 struct btrfs_free_space_ctl *free_ino_ctl; 1146 enum btrfs_caching_type ino_cache_state; 1147 spinlock_t ino_cache_lock; 1148 wait_queue_head_t ino_cache_wait; 1149 struct btrfs_free_space_ctl *free_ino_pinned; 1150 u64 ino_cache_progress; 1151 struct inode *ino_cache_inode; 1152 1153 struct mutex log_mutex; 1154 wait_queue_head_t log_writer_wait; 1155 wait_queue_head_t log_commit_wait[2]; 1156 struct list_head log_ctxs[2]; 1157 atomic_t log_writers; 1158 atomic_t log_commit[2]; 1159 atomic_t log_batch; 1160 int log_transid; 1161 /* No matter the commit succeeds or not*/ 1162 int log_transid_committed; 1163 /* Just be updated when the commit succeeds. */ 1164 int last_log_commit; 1165 pid_t log_start_pid; 1166 1167 u64 objectid; 1168 u64 last_trans; 1169 1170 /* data allocations are done in sectorsize units */ 1171 u32 sectorsize; 1172 1173 /* node allocations are done in nodesize units */ 1174 u32 nodesize; 1175 1176 u32 stripesize; 1177 1178 u32 type; 1179 1180 u64 highest_objectid; 1181 1182 /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */ 1183 u64 alloc_bytenr; 1184 1185 u64 defrag_trans_start; 1186 struct btrfs_key defrag_progress; 1187 struct btrfs_key defrag_max; 1188 char *name; 1189 1190 /* the dirty list is only used by non-reference counted roots */ 1191 struct list_head dirty_list; 1192 1193 struct list_head root_list; 1194 1195 spinlock_t log_extents_lock[2]; 1196 struct list_head logged_list[2]; 1197 1198 spinlock_t orphan_lock; 1199 atomic_t orphan_inodes; 1200 struct btrfs_block_rsv *orphan_block_rsv; 1201 int orphan_cleanup_state; 1202 1203 spinlock_t inode_lock; 1204 /* red-black tree that keeps track of in-memory inodes */ 1205 struct rb_root inode_tree; 1206 1207 /* 1208 * radix tree that keeps track of delayed nodes of every inode, 1209 * protected by inode_lock 1210 */ 1211 struct radix_tree_root delayed_nodes_tree; 1212 /* 1213 * right now this just gets used so that a root has its own devid 1214 * for stat. It may be used for more later 1215 */ 1216 dev_t anon_dev; 1217 1218 spinlock_t root_item_lock; 1219 atomic_t refs; 1220 1221 struct mutex delalloc_mutex; 1222 spinlock_t delalloc_lock; 1223 /* 1224 * all of the inodes that have delalloc bytes. It is possible for 1225 * this list to be empty even when there is still dirty data=ordered 1226 * extents waiting to finish IO. 1227 */ 1228 struct list_head delalloc_inodes; 1229 struct list_head delalloc_root; 1230 u64 nr_delalloc_inodes; 1231 1232 struct mutex ordered_extent_mutex; 1233 /* 1234 * this is used by the balancing code to wait for all the pending 1235 * ordered extents 1236 */ 1237 spinlock_t ordered_extent_lock; 1238 1239 /* 1240 * all of the data=ordered extents pending writeback 1241 * these can span multiple transactions and basically include 1242 * every dirty data page that isn't from nodatacow 1243 */ 1244 struct list_head ordered_extents; 1245 struct list_head ordered_root; 1246 u64 nr_ordered_extents; 1247 1248 /* 1249 * Number of currently running SEND ioctls to prevent 1250 * manipulation with the read-only status via SUBVOL_SETFLAGS 1251 */ 1252 int send_in_progress; 1253 struct btrfs_subvolume_writers *subv_writers; 1254 atomic_t will_be_snapshoted; 1255 1256 /* For qgroup metadata space reserve */ 1257 atomic_t qgroup_meta_rsv; 1258 }; 1259 1260 /* 1261 * Flags for mount options. 1262 * 1263 * Note: don't forget to add new options to btrfs_show_options() 1264 */ 1265 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1266 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1267 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1268 #define BTRFS_MOUNT_SSD (1 << 3) 1269 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1270 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1271 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1272 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1273 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1274 #define BTRFS_MOUNT_NOSSD (1 << 9) 1275 #define BTRFS_MOUNT_DISCARD (1 << 10) 1276 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1277 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1278 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1279 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1280 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1281 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) 1282 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) 1283 #define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) 1284 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) 1285 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) 1286 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) 1287 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) 1288 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) 1289 #define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24) 1290 #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25) 1291 #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26) 1292 #define BTRFS_MOUNT_NOLOGREPLAY (1 << 27) 1293 1294 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 1295 #define BTRFS_DEFAULT_MAX_INLINE (2048) 1296 1297 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1298 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1299 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1300 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1301 BTRFS_MOUNT_##opt) 1302 1303 #define btrfs_set_and_info(root, opt, fmt, args...) \ 1304 { \ 1305 if (!btrfs_test_opt(root, opt)) \ 1306 btrfs_info(root->fs_info, fmt, ##args); \ 1307 btrfs_set_opt(root->fs_info->mount_opt, opt); \ 1308 } 1309 1310 #define btrfs_clear_and_info(root, opt, fmt, args...) \ 1311 { \ 1312 if (btrfs_test_opt(root, opt)) \ 1313 btrfs_info(root->fs_info, fmt, ##args); \ 1314 btrfs_clear_opt(root->fs_info->mount_opt, opt); \ 1315 } 1316 1317 #ifdef CONFIG_BTRFS_DEBUG 1318 static inline int 1319 btrfs_should_fragment_free_space(struct btrfs_root *root, 1320 struct btrfs_block_group_cache *block_group) 1321 { 1322 return (btrfs_test_opt(root, FRAGMENT_METADATA) && 1323 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) || 1324 (btrfs_test_opt(root, FRAGMENT_DATA) && 1325 block_group->flags & BTRFS_BLOCK_GROUP_DATA); 1326 } 1327 #endif 1328 1329 /* 1330 * Requests for changes that need to be done during transaction commit. 1331 * 1332 * Internal mount options that are used for special handling of the real 1333 * mount options (eg. cannot be set during remount and have to be set during 1334 * transaction commit) 1335 */ 1336 1337 #define BTRFS_PENDING_SET_INODE_MAP_CACHE (0) 1338 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1) 1339 #define BTRFS_PENDING_COMMIT (2) 1340 1341 #define btrfs_test_pending(info, opt) \ 1342 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1343 #define btrfs_set_pending(info, opt) \ 1344 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1345 #define btrfs_clear_pending(info, opt) \ 1346 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1347 1348 /* 1349 * Helpers for setting pending mount option changes. 1350 * 1351 * Expects corresponding macros 1352 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name 1353 */ 1354 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \ 1355 do { \ 1356 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1357 btrfs_info((info), fmt, ##args); \ 1358 btrfs_set_pending((info), SET_##opt); \ 1359 btrfs_clear_pending((info), CLEAR_##opt); \ 1360 } \ 1361 } while(0) 1362 1363 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \ 1364 do { \ 1365 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1366 btrfs_info((info), fmt, ##args); \ 1367 btrfs_set_pending((info), CLEAR_##opt); \ 1368 btrfs_clear_pending((info), SET_##opt); \ 1369 } \ 1370 } while(0) 1371 1372 /* 1373 * Inode flags 1374 */ 1375 #define BTRFS_INODE_NODATASUM (1 << 0) 1376 #define BTRFS_INODE_NODATACOW (1 << 1) 1377 #define BTRFS_INODE_READONLY (1 << 2) 1378 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1379 #define BTRFS_INODE_PREALLOC (1 << 4) 1380 #define BTRFS_INODE_SYNC (1 << 5) 1381 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1382 #define BTRFS_INODE_APPEND (1 << 7) 1383 #define BTRFS_INODE_NODUMP (1 << 8) 1384 #define BTRFS_INODE_NOATIME (1 << 9) 1385 #define BTRFS_INODE_DIRSYNC (1 << 10) 1386 #define BTRFS_INODE_COMPRESS (1 << 11) 1387 1388 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 1389 1390 struct btrfs_map_token { 1391 struct extent_buffer *eb; 1392 char *kaddr; 1393 unsigned long offset; 1394 }; 1395 1396 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \ 1397 ((bytes) >> (fs_info)->sb->s_blocksize_bits) 1398 1399 static inline void btrfs_init_map_token (struct btrfs_map_token *token) 1400 { 1401 token->kaddr = NULL; 1402 } 1403 1404 /* some macros to generate set/get functions for the struct fields. This 1405 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1406 * one for u8: 1407 */ 1408 #define le8_to_cpu(v) (v) 1409 #define cpu_to_le8(v) (v) 1410 #define __le8 u8 1411 1412 #define read_eb_member(eb, ptr, type, member, result) ( \ 1413 read_extent_buffer(eb, (char *)(result), \ 1414 ((unsigned long)(ptr)) + \ 1415 offsetof(type, member), \ 1416 sizeof(((type *)0)->member))) 1417 1418 #define write_eb_member(eb, ptr, type, member, result) ( \ 1419 write_extent_buffer(eb, (char *)(result), \ 1420 ((unsigned long)(ptr)) + \ 1421 offsetof(type, member), \ 1422 sizeof(((type *)0)->member))) 1423 1424 #define DECLARE_BTRFS_SETGET_BITS(bits) \ 1425 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \ 1426 unsigned long off, \ 1427 struct btrfs_map_token *token); \ 1428 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \ 1429 unsigned long off, u##bits val, \ 1430 struct btrfs_map_token *token); \ 1431 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \ 1432 unsigned long off) \ 1433 { \ 1434 return btrfs_get_token_##bits(eb, ptr, off, NULL); \ 1435 } \ 1436 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \ 1437 unsigned long off, u##bits val) \ 1438 { \ 1439 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \ 1440 } 1441 1442 DECLARE_BTRFS_SETGET_BITS(8) 1443 DECLARE_BTRFS_SETGET_BITS(16) 1444 DECLARE_BTRFS_SETGET_BITS(32) 1445 DECLARE_BTRFS_SETGET_BITS(64) 1446 1447 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1448 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \ 1449 { \ 1450 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1451 return btrfs_get_##bits(eb, s, offsetof(type, member)); \ 1452 } \ 1453 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \ 1454 u##bits val) \ 1455 { \ 1456 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1457 btrfs_set_##bits(eb, s, offsetof(type, member), val); \ 1458 } \ 1459 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \ 1460 struct btrfs_map_token *token) \ 1461 { \ 1462 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1463 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \ 1464 } \ 1465 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \ 1466 type *s, u##bits val, \ 1467 struct btrfs_map_token *token) \ 1468 { \ 1469 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1470 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \ 1471 } 1472 1473 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1474 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1475 { \ 1476 type *p = page_address(eb->pages[0]); \ 1477 u##bits res = le##bits##_to_cpu(p->member); \ 1478 return res; \ 1479 } \ 1480 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1481 u##bits val) \ 1482 { \ 1483 type *p = page_address(eb->pages[0]); \ 1484 p->member = cpu_to_le##bits(val); \ 1485 } 1486 1487 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1488 static inline u##bits btrfs_##name(type *s) \ 1489 { \ 1490 return le##bits##_to_cpu(s->member); \ 1491 } \ 1492 static inline void btrfs_set_##name(type *s, u##bits val) \ 1493 { \ 1494 s->member = cpu_to_le##bits(val); \ 1495 } 1496 1497 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1498 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1499 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1500 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1501 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1502 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1503 start_offset, 64); 1504 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1505 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1506 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1507 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1508 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1509 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1510 1511 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1512 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1513 total_bytes, 64); 1514 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1515 bytes_used, 64); 1516 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1517 io_align, 32); 1518 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1519 io_width, 32); 1520 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1521 sector_size, 32); 1522 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1523 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1524 dev_group, 32); 1525 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1526 seek_speed, 8); 1527 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1528 bandwidth, 8); 1529 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1530 generation, 64); 1531 1532 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d) 1533 { 1534 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid); 1535 } 1536 1537 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d) 1538 { 1539 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid); 1540 } 1541 1542 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1543 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1544 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1545 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1546 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1547 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1548 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1549 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1550 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1551 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1552 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1553 1554 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1555 { 1556 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1557 } 1558 1559 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1560 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1561 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1562 stripe_len, 64); 1563 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1564 io_align, 32); 1565 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1566 io_width, 32); 1567 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1568 sector_size, 32); 1569 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1570 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1571 num_stripes, 16); 1572 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1573 sub_stripes, 16); 1574 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1575 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1576 1577 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1578 int nr) 1579 { 1580 unsigned long offset = (unsigned long)c; 1581 offset += offsetof(struct btrfs_chunk, stripe); 1582 offset += nr * sizeof(struct btrfs_stripe); 1583 return (struct btrfs_stripe *)offset; 1584 } 1585 1586 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1587 { 1588 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1589 } 1590 1591 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1592 struct btrfs_chunk *c, int nr) 1593 { 1594 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1595 } 1596 1597 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1598 struct btrfs_chunk *c, int nr) 1599 { 1600 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1601 } 1602 1603 /* struct btrfs_block_group_item */ 1604 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1605 used, 64); 1606 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1607 used, 64); 1608 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1609 struct btrfs_block_group_item, chunk_objectid, 64); 1610 1611 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1612 struct btrfs_block_group_item, chunk_objectid, 64); 1613 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1614 struct btrfs_block_group_item, flags, 64); 1615 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1616 struct btrfs_block_group_item, flags, 64); 1617 1618 /* struct btrfs_free_space_info */ 1619 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info, 1620 extent_count, 32); 1621 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32); 1622 1623 /* struct btrfs_inode_ref */ 1624 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1625 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1626 1627 /* struct btrfs_inode_extref */ 1628 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref, 1629 parent_objectid, 64); 1630 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref, 1631 name_len, 16); 1632 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64); 1633 1634 /* struct btrfs_inode_item */ 1635 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1636 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1637 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1638 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1639 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1640 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1641 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1642 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1643 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1644 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1645 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1646 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1647 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item, 1648 generation, 64); 1649 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item, 1650 sequence, 64); 1651 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item, 1652 transid, 64); 1653 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64); 1654 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item, 1655 nbytes, 64); 1656 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item, 1657 block_group, 64); 1658 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32); 1659 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32); 1660 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32); 1661 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32); 1662 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64); 1663 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64); 1664 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1665 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1666 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64); 1667 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32); 1668 1669 /* struct btrfs_dev_extent */ 1670 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1671 chunk_tree, 64); 1672 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1673 chunk_objectid, 64); 1674 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1675 chunk_offset, 64); 1676 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1677 1678 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1679 { 1680 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1681 return (unsigned long)dev + ptr; 1682 } 1683 1684 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1685 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1686 generation, 64); 1687 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1688 1689 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); 1690 1691 1692 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1693 1694 static inline void btrfs_tree_block_key(struct extent_buffer *eb, 1695 struct btrfs_tree_block_info *item, 1696 struct btrfs_disk_key *key) 1697 { 1698 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1699 } 1700 1701 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, 1702 struct btrfs_tree_block_info *item, 1703 struct btrfs_disk_key *key) 1704 { 1705 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1706 } 1707 1708 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1709 root, 64); 1710 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1711 objectid, 64); 1712 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1713 offset, 64); 1714 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1715 count, 32); 1716 1717 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1718 count, 32); 1719 1720 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1721 type, 8); 1722 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1723 offset, 64); 1724 1725 static inline u32 btrfs_extent_inline_ref_size(int type) 1726 { 1727 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1728 type == BTRFS_SHARED_BLOCK_REF_KEY) 1729 return sizeof(struct btrfs_extent_inline_ref); 1730 if (type == BTRFS_SHARED_DATA_REF_KEY) 1731 return sizeof(struct btrfs_shared_data_ref) + 1732 sizeof(struct btrfs_extent_inline_ref); 1733 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1734 return sizeof(struct btrfs_extent_data_ref) + 1735 offsetof(struct btrfs_extent_inline_ref, offset); 1736 BUG(); 1737 return 0; 1738 } 1739 1740 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); 1741 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, 1742 generation, 64); 1743 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); 1744 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32); 1745 1746 /* struct btrfs_node */ 1747 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1748 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1749 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 1750 blockptr, 64); 1751 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr, 1752 generation, 64); 1753 1754 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1755 { 1756 unsigned long ptr; 1757 ptr = offsetof(struct btrfs_node, ptrs) + 1758 sizeof(struct btrfs_key_ptr) * nr; 1759 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1760 } 1761 1762 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1763 int nr, u64 val) 1764 { 1765 unsigned long ptr; 1766 ptr = offsetof(struct btrfs_node, ptrs) + 1767 sizeof(struct btrfs_key_ptr) * nr; 1768 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1769 } 1770 1771 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1772 { 1773 unsigned long ptr; 1774 ptr = offsetof(struct btrfs_node, ptrs) + 1775 sizeof(struct btrfs_key_ptr) * nr; 1776 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1777 } 1778 1779 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1780 int nr, u64 val) 1781 { 1782 unsigned long ptr; 1783 ptr = offsetof(struct btrfs_node, ptrs) + 1784 sizeof(struct btrfs_key_ptr) * nr; 1785 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1786 } 1787 1788 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1789 { 1790 return offsetof(struct btrfs_node, ptrs) + 1791 sizeof(struct btrfs_key_ptr) * nr; 1792 } 1793 1794 void btrfs_node_key(struct extent_buffer *eb, 1795 struct btrfs_disk_key *disk_key, int nr); 1796 1797 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1798 struct btrfs_disk_key *disk_key, int nr) 1799 { 1800 unsigned long ptr; 1801 ptr = btrfs_node_key_ptr_offset(nr); 1802 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1803 struct btrfs_key_ptr, key, disk_key); 1804 } 1805 1806 /* struct btrfs_item */ 1807 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1808 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1809 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32); 1810 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32); 1811 1812 static inline unsigned long btrfs_item_nr_offset(int nr) 1813 { 1814 return offsetof(struct btrfs_leaf, items) + 1815 sizeof(struct btrfs_item) * nr; 1816 } 1817 1818 static inline struct btrfs_item *btrfs_item_nr(int nr) 1819 { 1820 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1821 } 1822 1823 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1824 struct btrfs_item *item) 1825 { 1826 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1827 } 1828 1829 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1830 { 1831 return btrfs_item_end(eb, btrfs_item_nr(nr)); 1832 } 1833 1834 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1835 { 1836 return btrfs_item_offset(eb, btrfs_item_nr(nr)); 1837 } 1838 1839 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1840 { 1841 return btrfs_item_size(eb, btrfs_item_nr(nr)); 1842 } 1843 1844 static inline void btrfs_item_key(struct extent_buffer *eb, 1845 struct btrfs_disk_key *disk_key, int nr) 1846 { 1847 struct btrfs_item *item = btrfs_item_nr(nr); 1848 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1849 } 1850 1851 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1852 struct btrfs_disk_key *disk_key, int nr) 1853 { 1854 struct btrfs_item *item = btrfs_item_nr(nr); 1855 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1856 } 1857 1858 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1859 1860 /* 1861 * struct btrfs_root_ref 1862 */ 1863 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1864 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1865 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1866 1867 /* struct btrfs_dir_item */ 1868 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1869 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1870 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1871 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1872 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8); 1873 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, 1874 data_len, 16); 1875 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, 1876 name_len, 16); 1877 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, 1878 transid, 64); 1879 1880 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1881 struct btrfs_dir_item *item, 1882 struct btrfs_disk_key *key) 1883 { 1884 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1885 } 1886 1887 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1888 struct btrfs_dir_item *item, 1889 struct btrfs_disk_key *key) 1890 { 1891 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1892 } 1893 1894 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 1895 num_entries, 64); 1896 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 1897 num_bitmaps, 64); 1898 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 1899 generation, 64); 1900 1901 static inline void btrfs_free_space_key(struct extent_buffer *eb, 1902 struct btrfs_free_space_header *h, 1903 struct btrfs_disk_key *key) 1904 { 1905 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1906 } 1907 1908 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 1909 struct btrfs_free_space_header *h, 1910 struct btrfs_disk_key *key) 1911 { 1912 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1913 } 1914 1915 /* struct btrfs_disk_key */ 1916 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1917 objectid, 64); 1918 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1919 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1920 1921 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1922 struct btrfs_disk_key *disk) 1923 { 1924 cpu->offset = le64_to_cpu(disk->offset); 1925 cpu->type = disk->type; 1926 cpu->objectid = le64_to_cpu(disk->objectid); 1927 } 1928 1929 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1930 struct btrfs_key *cpu) 1931 { 1932 disk->offset = cpu_to_le64(cpu->offset); 1933 disk->type = cpu->type; 1934 disk->objectid = cpu_to_le64(cpu->objectid); 1935 } 1936 1937 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1938 struct btrfs_key *key, int nr) 1939 { 1940 struct btrfs_disk_key disk_key; 1941 btrfs_node_key(eb, &disk_key, nr); 1942 btrfs_disk_key_to_cpu(key, &disk_key); 1943 } 1944 1945 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1946 struct btrfs_key *key, int nr) 1947 { 1948 struct btrfs_disk_key disk_key; 1949 btrfs_item_key(eb, &disk_key, nr); 1950 btrfs_disk_key_to_cpu(key, &disk_key); 1951 } 1952 1953 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1954 struct btrfs_dir_item *item, 1955 struct btrfs_key *key) 1956 { 1957 struct btrfs_disk_key disk_key; 1958 btrfs_dir_item_key(eb, item, &disk_key); 1959 btrfs_disk_key_to_cpu(key, &disk_key); 1960 } 1961 1962 1963 static inline u8 btrfs_key_type(struct btrfs_key *key) 1964 { 1965 return key->type; 1966 } 1967 1968 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1969 { 1970 key->type = val; 1971 } 1972 1973 /* struct btrfs_header */ 1974 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1975 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1976 generation, 64); 1977 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1978 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1979 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1980 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1981 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header, 1982 generation, 64); 1983 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64); 1984 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, 1985 nritems, 32); 1986 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64); 1987 1988 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1989 { 1990 return (btrfs_header_flags(eb) & flag) == flag; 1991 } 1992 1993 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1994 { 1995 u64 flags = btrfs_header_flags(eb); 1996 btrfs_set_header_flags(eb, flags | flag); 1997 return (flags & flag) == flag; 1998 } 1999 2000 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 2001 { 2002 u64 flags = btrfs_header_flags(eb); 2003 btrfs_set_header_flags(eb, flags & ~flag); 2004 return (flags & flag) == flag; 2005 } 2006 2007 static inline int btrfs_header_backref_rev(struct extent_buffer *eb) 2008 { 2009 u64 flags = btrfs_header_flags(eb); 2010 return flags >> BTRFS_BACKREF_REV_SHIFT; 2011 } 2012 2013 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 2014 int rev) 2015 { 2016 u64 flags = btrfs_header_flags(eb); 2017 flags &= ~BTRFS_BACKREF_REV_MASK; 2018 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 2019 btrfs_set_header_flags(eb, flags); 2020 } 2021 2022 static inline unsigned long btrfs_header_fsid(void) 2023 { 2024 return offsetof(struct btrfs_header, fsid); 2025 } 2026 2027 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 2028 { 2029 return offsetof(struct btrfs_header, chunk_tree_uuid); 2030 } 2031 2032 static inline int btrfs_is_leaf(struct extent_buffer *eb) 2033 { 2034 return btrfs_header_level(eb) == 0; 2035 } 2036 2037 /* struct btrfs_root_item */ 2038 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 2039 generation, 64); 2040 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 2041 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 2042 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 2043 2044 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 2045 generation, 64); 2046 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 2047 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 2048 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 2049 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 2050 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 2051 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 2052 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 2053 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 2054 last_snapshot, 64); 2055 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item, 2056 generation_v2, 64); 2057 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item, 2058 ctransid, 64); 2059 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, 2060 otransid, 64); 2061 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, 2062 stransid, 64); 2063 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, 2064 rtransid, 64); 2065 2066 static inline bool btrfs_root_readonly(struct btrfs_root *root) 2067 { 2068 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; 2069 } 2070 2071 static inline bool btrfs_root_dead(struct btrfs_root *root) 2072 { 2073 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0; 2074 } 2075 2076 /* struct btrfs_root_backup */ 2077 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, 2078 tree_root, 64); 2079 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, 2080 tree_root_gen, 64); 2081 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, 2082 tree_root_level, 8); 2083 2084 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, 2085 chunk_root, 64); 2086 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, 2087 chunk_root_gen, 64); 2088 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, 2089 chunk_root_level, 8); 2090 2091 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, 2092 extent_root, 64); 2093 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, 2094 extent_root_gen, 64); 2095 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, 2096 extent_root_level, 8); 2097 2098 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, 2099 fs_root, 64); 2100 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, 2101 fs_root_gen, 64); 2102 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, 2103 fs_root_level, 8); 2104 2105 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, 2106 dev_root, 64); 2107 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, 2108 dev_root_gen, 64); 2109 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, 2110 dev_root_level, 8); 2111 2112 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, 2113 csum_root, 64); 2114 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, 2115 csum_root_gen, 64); 2116 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, 2117 csum_root_level, 8); 2118 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, 2119 total_bytes, 64); 2120 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, 2121 bytes_used, 64); 2122 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, 2123 num_devices, 64); 2124 2125 /* struct btrfs_balance_item */ 2126 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); 2127 2128 static inline void btrfs_balance_data(struct extent_buffer *eb, 2129 struct btrfs_balance_item *bi, 2130 struct btrfs_disk_balance_args *ba) 2131 { 2132 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2133 } 2134 2135 static inline void btrfs_set_balance_data(struct extent_buffer *eb, 2136 struct btrfs_balance_item *bi, 2137 struct btrfs_disk_balance_args *ba) 2138 { 2139 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2140 } 2141 2142 static inline void btrfs_balance_meta(struct extent_buffer *eb, 2143 struct btrfs_balance_item *bi, 2144 struct btrfs_disk_balance_args *ba) 2145 { 2146 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2147 } 2148 2149 static inline void btrfs_set_balance_meta(struct extent_buffer *eb, 2150 struct btrfs_balance_item *bi, 2151 struct btrfs_disk_balance_args *ba) 2152 { 2153 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2154 } 2155 2156 static inline void btrfs_balance_sys(struct extent_buffer *eb, 2157 struct btrfs_balance_item *bi, 2158 struct btrfs_disk_balance_args *ba) 2159 { 2160 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2161 } 2162 2163 static inline void btrfs_set_balance_sys(struct extent_buffer *eb, 2164 struct btrfs_balance_item *bi, 2165 struct btrfs_disk_balance_args *ba) 2166 { 2167 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2168 } 2169 2170 static inline void 2171 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu, 2172 struct btrfs_disk_balance_args *disk) 2173 { 2174 memset(cpu, 0, sizeof(*cpu)); 2175 2176 cpu->profiles = le64_to_cpu(disk->profiles); 2177 cpu->usage = le64_to_cpu(disk->usage); 2178 cpu->devid = le64_to_cpu(disk->devid); 2179 cpu->pstart = le64_to_cpu(disk->pstart); 2180 cpu->pend = le64_to_cpu(disk->pend); 2181 cpu->vstart = le64_to_cpu(disk->vstart); 2182 cpu->vend = le64_to_cpu(disk->vend); 2183 cpu->target = le64_to_cpu(disk->target); 2184 cpu->flags = le64_to_cpu(disk->flags); 2185 cpu->limit = le64_to_cpu(disk->limit); 2186 } 2187 2188 static inline void 2189 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk, 2190 struct btrfs_balance_args *cpu) 2191 { 2192 memset(disk, 0, sizeof(*disk)); 2193 2194 disk->profiles = cpu_to_le64(cpu->profiles); 2195 disk->usage = cpu_to_le64(cpu->usage); 2196 disk->devid = cpu_to_le64(cpu->devid); 2197 disk->pstart = cpu_to_le64(cpu->pstart); 2198 disk->pend = cpu_to_le64(cpu->pend); 2199 disk->vstart = cpu_to_le64(cpu->vstart); 2200 disk->vend = cpu_to_le64(cpu->vend); 2201 disk->target = cpu_to_le64(cpu->target); 2202 disk->flags = cpu_to_le64(cpu->flags); 2203 disk->limit = cpu_to_le64(cpu->limit); 2204 } 2205 2206 /* struct btrfs_super_block */ 2207 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 2208 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 2209 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 2210 generation, 64); 2211 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 2212 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 2213 struct btrfs_super_block, sys_chunk_array_size, 32); 2214 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 2215 struct btrfs_super_block, chunk_root_generation, 64); 2216 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 2217 root_level, 8); 2218 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 2219 chunk_root, 64); 2220 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 2221 chunk_root_level, 8); 2222 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 2223 log_root, 64); 2224 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 2225 log_root_transid, 64); 2226 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 2227 log_root_level, 8); 2228 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 2229 total_bytes, 64); 2230 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 2231 bytes_used, 64); 2232 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 2233 sectorsize, 32); 2234 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 2235 nodesize, 32); 2236 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 2237 stripesize, 32); 2238 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 2239 root_dir_objectid, 64); 2240 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 2241 num_devices, 64); 2242 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 2243 compat_flags, 64); 2244 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 2245 compat_ro_flags, 64); 2246 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 2247 incompat_flags, 64); 2248 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 2249 csum_type, 16); 2250 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 2251 cache_generation, 64); 2252 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); 2253 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, 2254 uuid_tree_generation, 64); 2255 2256 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 2257 { 2258 u16 t = btrfs_super_csum_type(s); 2259 /* 2260 * csum type is validated at mount time 2261 */ 2262 return btrfs_csum_sizes[t]; 2263 } 2264 2265 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 2266 { 2267 return offsetof(struct btrfs_leaf, items); 2268 } 2269 2270 /* struct btrfs_file_extent_item */ 2271 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 2272 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, 2273 struct btrfs_file_extent_item, disk_bytenr, 64); 2274 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, 2275 struct btrfs_file_extent_item, offset, 64); 2276 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, 2277 struct btrfs_file_extent_item, generation, 64); 2278 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, 2279 struct btrfs_file_extent_item, num_bytes, 64); 2280 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes, 2281 struct btrfs_file_extent_item, disk_num_bytes, 64); 2282 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, 2283 struct btrfs_file_extent_item, compression, 8); 2284 2285 static inline unsigned long 2286 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 2287 { 2288 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START; 2289 } 2290 2291 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2292 { 2293 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize; 2294 } 2295 2296 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2297 disk_bytenr, 64); 2298 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2299 generation, 64); 2300 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2301 disk_num_bytes, 64); 2302 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2303 offset, 64); 2304 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2305 num_bytes, 64); 2306 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2307 ram_bytes, 64); 2308 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2309 compression, 8); 2310 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2311 encryption, 8); 2312 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2313 other_encoding, 16); 2314 2315 /* 2316 * this returns the number of bytes used by the item on disk, minus the 2317 * size of any extent headers. If a file is compressed on disk, this is 2318 * the compressed size 2319 */ 2320 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 2321 struct btrfs_item *e) 2322 { 2323 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START; 2324 } 2325 2326 /* this returns the number of file bytes represented by the inline item. 2327 * If an item is compressed, this is the uncompressed size 2328 */ 2329 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 2330 int slot, 2331 struct btrfs_file_extent_item *fi) 2332 { 2333 struct btrfs_map_token token; 2334 2335 btrfs_init_map_token(&token); 2336 /* 2337 * return the space used on disk if this item isn't 2338 * compressed or encoded 2339 */ 2340 if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 && 2341 btrfs_token_file_extent_encryption(eb, fi, &token) == 0 && 2342 btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) { 2343 return btrfs_file_extent_inline_item_len(eb, 2344 btrfs_item_nr(slot)); 2345 } 2346 2347 /* otherwise use the ram bytes field */ 2348 return btrfs_token_file_extent_ram_bytes(eb, fi, &token); 2349 } 2350 2351 2352 /* btrfs_dev_stats_item */ 2353 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb, 2354 struct btrfs_dev_stats_item *ptr, 2355 int index) 2356 { 2357 u64 val; 2358 2359 read_extent_buffer(eb, &val, 2360 offsetof(struct btrfs_dev_stats_item, values) + 2361 ((unsigned long)ptr) + (index * sizeof(u64)), 2362 sizeof(val)); 2363 return val; 2364 } 2365 2366 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb, 2367 struct btrfs_dev_stats_item *ptr, 2368 int index, u64 val) 2369 { 2370 write_extent_buffer(eb, &val, 2371 offsetof(struct btrfs_dev_stats_item, values) + 2372 ((unsigned long)ptr) + (index * sizeof(u64)), 2373 sizeof(val)); 2374 } 2375 2376 /* btrfs_qgroup_status_item */ 2377 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item, 2378 generation, 64); 2379 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 2380 version, 64); 2381 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item, 2382 flags, 64); 2383 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item, 2384 rescan, 64); 2385 2386 /* btrfs_qgroup_info_item */ 2387 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item, 2388 generation, 64); 2389 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64); 2390 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item, 2391 rfer_cmpr, 64); 2392 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64); 2393 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item, 2394 excl_cmpr, 64); 2395 2396 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation, 2397 struct btrfs_qgroup_info_item, generation, 64); 2398 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item, 2399 rfer, 64); 2400 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr, 2401 struct btrfs_qgroup_info_item, rfer_cmpr, 64); 2402 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item, 2403 excl, 64); 2404 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr, 2405 struct btrfs_qgroup_info_item, excl_cmpr, 64); 2406 2407 /* btrfs_qgroup_limit_item */ 2408 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item, 2409 flags, 64); 2410 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item, 2411 max_rfer, 64); 2412 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item, 2413 max_excl, 64); 2414 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item, 2415 rsv_rfer, 64); 2416 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item, 2417 rsv_excl, 64); 2418 2419 /* btrfs_dev_replace_item */ 2420 BTRFS_SETGET_FUNCS(dev_replace_src_devid, 2421 struct btrfs_dev_replace_item, src_devid, 64); 2422 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode, 2423 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode, 2424 64); 2425 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item, 2426 replace_state, 64); 2427 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item, 2428 time_started, 64); 2429 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item, 2430 time_stopped, 64); 2431 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item, 2432 num_write_errors, 64); 2433 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors, 2434 struct btrfs_dev_replace_item, num_uncorrectable_read_errors, 2435 64); 2436 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item, 2437 cursor_left, 64); 2438 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item, 2439 cursor_right, 64); 2440 2441 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid, 2442 struct btrfs_dev_replace_item, src_devid, 64); 2443 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode, 2444 struct btrfs_dev_replace_item, 2445 cont_reading_from_srcdev_mode, 64); 2446 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state, 2447 struct btrfs_dev_replace_item, replace_state, 64); 2448 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started, 2449 struct btrfs_dev_replace_item, time_started, 64); 2450 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped, 2451 struct btrfs_dev_replace_item, time_stopped, 64); 2452 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors, 2453 struct btrfs_dev_replace_item, num_write_errors, 64); 2454 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors, 2455 struct btrfs_dev_replace_item, 2456 num_uncorrectable_read_errors, 64); 2457 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left, 2458 struct btrfs_dev_replace_item, cursor_left, 64); 2459 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 2460 struct btrfs_dev_replace_item, cursor_right, 64); 2461 2462 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb) 2463 { 2464 return sb->s_fs_info; 2465 } 2466 2467 /* helper function to cast into the data area of the leaf. */ 2468 #define btrfs_item_ptr(leaf, slot, type) \ 2469 ((type *)(btrfs_leaf_data(leaf) + \ 2470 btrfs_item_offset_nr(leaf, slot))) 2471 2472 #define btrfs_item_ptr_offset(leaf, slot) \ 2473 ((unsigned long)(btrfs_leaf_data(leaf) + \ 2474 btrfs_item_offset_nr(leaf, slot))) 2475 2476 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 2477 { 2478 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 2479 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 2480 } 2481 2482 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) 2483 { 2484 return mapping_gfp_constraint(mapping, ~__GFP_FS); 2485 } 2486 2487 /* extent-tree.c */ 2488 2489 u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes); 2490 2491 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root, 2492 unsigned num_items) 2493 { 2494 return root->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; 2495 } 2496 2497 /* 2498 * Doing a truncate won't result in new nodes or leaves, just what we need for 2499 * COW. 2500 */ 2501 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root, 2502 unsigned num_items) 2503 { 2504 return root->nodesize * BTRFS_MAX_LEVEL * num_items; 2505 } 2506 2507 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, 2508 struct btrfs_root *root); 2509 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, 2510 struct btrfs_root *root); 2511 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, 2512 const u64 start); 2513 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg); 2514 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 2515 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 2516 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg); 2517 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2518 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 2519 struct btrfs_root *root, unsigned long count); 2520 int btrfs_async_run_delayed_refs(struct btrfs_root *root, 2521 unsigned long count, int wait); 2522 int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len); 2523 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 2524 struct btrfs_root *root, u64 bytenr, 2525 u64 offset, int metadata, u64 *refs, u64 *flags); 2526 int btrfs_pin_extent(struct btrfs_root *root, 2527 u64 bytenr, u64 num, int reserved); 2528 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, 2529 u64 bytenr, u64 num_bytes); 2530 int btrfs_exclude_logged_extents(struct btrfs_root *root, 2531 struct extent_buffer *eb); 2532 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 2533 struct btrfs_root *root, 2534 u64 objectid, u64 offset, u64 bytenr); 2535 struct btrfs_block_group_cache *btrfs_lookup_block_group( 2536 struct btrfs_fs_info *info, 2537 u64 bytenr); 2538 void btrfs_get_block_group(struct btrfs_block_group_cache *cache); 2539 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2540 int get_block_group_index(struct btrfs_block_group_cache *cache); 2541 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, 2542 struct btrfs_root *root, u64 parent, 2543 u64 root_objectid, 2544 struct btrfs_disk_key *key, int level, 2545 u64 hint, u64 empty_size); 2546 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2547 struct btrfs_root *root, 2548 struct extent_buffer *buf, 2549 u64 parent, int last_ref); 2550 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 2551 struct btrfs_root *root, 2552 u64 root_objectid, u64 owner, 2553 u64 offset, u64 ram_bytes, 2554 struct btrfs_key *ins); 2555 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 2556 struct btrfs_root *root, 2557 u64 root_objectid, u64 owner, u64 offset, 2558 struct btrfs_key *ins); 2559 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes, 2560 u64 min_alloc_size, u64 empty_size, u64 hint_byte, 2561 struct btrfs_key *ins, int is_data, int delalloc); 2562 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2563 struct extent_buffer *buf, int full_backref); 2564 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2565 struct extent_buffer *buf, int full_backref); 2566 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2567 struct btrfs_root *root, 2568 u64 bytenr, u64 num_bytes, u64 flags, 2569 int level, int is_data); 2570 int btrfs_free_extent(struct btrfs_trans_handle *trans, 2571 struct btrfs_root *root, 2572 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, 2573 u64 owner, u64 offset); 2574 2575 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len, 2576 int delalloc); 2577 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, 2578 u64 start, u64 len); 2579 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, 2580 struct btrfs_root *root); 2581 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 2582 struct btrfs_root *root); 2583 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2584 struct btrfs_root *root, 2585 u64 bytenr, u64 num_bytes, u64 parent, 2586 u64 root_objectid, u64 owner, u64 offset); 2587 2588 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans, 2589 struct btrfs_root *root); 2590 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 2591 struct btrfs_root *root); 2592 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, 2593 struct btrfs_root *root); 2594 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 2595 int btrfs_free_block_groups(struct btrfs_fs_info *info); 2596 int btrfs_read_block_groups(struct btrfs_root *root); 2597 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); 2598 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 2599 struct btrfs_root *root, u64 bytes_used, 2600 u64 type, u64 chunk_objectid, u64 chunk_offset, 2601 u64 size); 2602 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 2603 struct btrfs_fs_info *fs_info, 2604 const u64 chunk_offset); 2605 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 2606 struct btrfs_root *root, u64 group_start, 2607 struct extent_map *em); 2608 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info); 2609 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache); 2610 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache); 2611 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, 2612 struct btrfs_root *root); 2613 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data); 2614 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2615 2616 enum btrfs_reserve_flush_enum { 2617 /* If we are in the transaction, we can't flush anything.*/ 2618 BTRFS_RESERVE_NO_FLUSH, 2619 /* 2620 * Flushing delalloc may cause deadlock somewhere, in this 2621 * case, use FLUSH LIMIT 2622 */ 2623 BTRFS_RESERVE_FLUSH_LIMIT, 2624 BTRFS_RESERVE_FLUSH_ALL, 2625 }; 2626 2627 int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len); 2628 int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes); 2629 void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len); 2630 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start, 2631 u64 len); 2632 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, 2633 struct btrfs_root *root); 2634 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans); 2635 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, 2636 struct inode *inode); 2637 void btrfs_orphan_release_metadata(struct inode *inode); 2638 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, 2639 struct btrfs_block_rsv *rsv, 2640 int nitems, 2641 u64 *qgroup_reserved, bool use_global_rsv); 2642 void btrfs_subvolume_release_metadata(struct btrfs_root *root, 2643 struct btrfs_block_rsv *rsv, 2644 u64 qgroup_reserved); 2645 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); 2646 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); 2647 int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len); 2648 void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len); 2649 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type); 2650 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, 2651 unsigned short type); 2652 void btrfs_free_block_rsv(struct btrfs_root *root, 2653 struct btrfs_block_rsv *rsv); 2654 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv); 2655 int btrfs_block_rsv_add(struct btrfs_root *root, 2656 struct btrfs_block_rsv *block_rsv, u64 num_bytes, 2657 enum btrfs_reserve_flush_enum flush); 2658 int btrfs_block_rsv_check(struct btrfs_root *root, 2659 struct btrfs_block_rsv *block_rsv, int min_factor); 2660 int btrfs_block_rsv_refill(struct btrfs_root *root, 2661 struct btrfs_block_rsv *block_rsv, u64 min_reserved, 2662 enum btrfs_reserve_flush_enum flush); 2663 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, 2664 struct btrfs_block_rsv *dst_rsv, 2665 u64 num_bytes); 2666 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, 2667 struct btrfs_block_rsv *dest, u64 num_bytes, 2668 int min_factor); 2669 void btrfs_block_rsv_release(struct btrfs_root *root, 2670 struct btrfs_block_rsv *block_rsv, 2671 u64 num_bytes); 2672 int btrfs_inc_block_group_ro(struct btrfs_root *root, 2673 struct btrfs_block_group_cache *cache); 2674 void btrfs_dec_block_group_ro(struct btrfs_root *root, 2675 struct btrfs_block_group_cache *cache); 2676 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 2677 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 2678 int btrfs_error_unpin_extent_range(struct btrfs_root *root, 2679 u64 start, u64 end); 2680 int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, 2681 u64 num_bytes, u64 *actual_bytes); 2682 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, 2683 struct btrfs_root *root, u64 type); 2684 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); 2685 2686 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 2687 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, 2688 struct btrfs_fs_info *fs_info); 2689 int __get_raid_index(u64 flags); 2690 int btrfs_start_write_no_snapshoting(struct btrfs_root *root); 2691 void btrfs_end_write_no_snapshoting(struct btrfs_root *root); 2692 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root); 2693 void check_system_chunk(struct btrfs_trans_handle *trans, 2694 struct btrfs_root *root, 2695 const u64 type); 2696 u64 add_new_free_space(struct btrfs_block_group_cache *block_group, 2697 struct btrfs_fs_info *info, u64 start, u64 end); 2698 2699 /* ctree.c */ 2700 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, 2701 int level, int *slot); 2702 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); 2703 int btrfs_previous_item(struct btrfs_root *root, 2704 struct btrfs_path *path, u64 min_objectid, 2705 int type); 2706 int btrfs_previous_extent_item(struct btrfs_root *root, 2707 struct btrfs_path *path, u64 min_objectid); 2708 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info, 2709 struct btrfs_path *path, 2710 struct btrfs_key *new_key); 2711 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2712 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 2713 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2714 struct btrfs_key *key, int lowest_level, 2715 u64 min_trans); 2716 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2717 struct btrfs_path *path, 2718 u64 min_trans); 2719 enum btrfs_compare_tree_result { 2720 BTRFS_COMPARE_TREE_NEW, 2721 BTRFS_COMPARE_TREE_DELETED, 2722 BTRFS_COMPARE_TREE_CHANGED, 2723 BTRFS_COMPARE_TREE_SAME, 2724 }; 2725 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root, 2726 struct btrfs_root *right_root, 2727 struct btrfs_path *left_path, 2728 struct btrfs_path *right_path, 2729 struct btrfs_key *key, 2730 enum btrfs_compare_tree_result result, 2731 void *ctx); 2732 int btrfs_compare_trees(struct btrfs_root *left_root, 2733 struct btrfs_root *right_root, 2734 btrfs_changed_cb_t cb, void *ctx); 2735 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2736 struct btrfs_root *root, struct extent_buffer *buf, 2737 struct extent_buffer *parent, int parent_slot, 2738 struct extent_buffer **cow_ret); 2739 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2740 struct btrfs_root *root, 2741 struct extent_buffer *buf, 2742 struct extent_buffer **cow_ret, u64 new_root_objectid); 2743 int btrfs_block_can_be_shared(struct btrfs_root *root, 2744 struct extent_buffer *buf); 2745 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path, 2746 u32 data_size); 2747 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path, 2748 u32 new_size, int from_end); 2749 int btrfs_split_item(struct btrfs_trans_handle *trans, 2750 struct btrfs_root *root, 2751 struct btrfs_path *path, 2752 struct btrfs_key *new_key, 2753 unsigned long split_offset); 2754 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 2755 struct btrfs_root *root, 2756 struct btrfs_path *path, 2757 struct btrfs_key *new_key); 2758 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path, 2759 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key); 2760 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 2761 *root, struct btrfs_key *key, struct btrfs_path *p, int 2762 ins_len, int cow); 2763 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key, 2764 struct btrfs_path *p, u64 time_seq); 2765 int btrfs_search_slot_for_read(struct btrfs_root *root, 2766 struct btrfs_key *key, struct btrfs_path *p, 2767 int find_higher, int return_any); 2768 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2769 struct btrfs_root *root, struct extent_buffer *parent, 2770 int start_slot, u64 *last_ret, 2771 struct btrfs_key *progress); 2772 void btrfs_release_path(struct btrfs_path *p); 2773 struct btrfs_path *btrfs_alloc_path(void); 2774 void btrfs_free_path(struct btrfs_path *p); 2775 void btrfs_set_path_blocking(struct btrfs_path *p); 2776 void btrfs_clear_path_blocking(struct btrfs_path *p, 2777 struct extent_buffer *held, int held_rw); 2778 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 2779 2780 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2781 struct btrfs_path *path, int slot, int nr); 2782 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2783 struct btrfs_root *root, 2784 struct btrfs_path *path) 2785 { 2786 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2787 } 2788 2789 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 2790 struct btrfs_key *cpu_key, u32 *data_size, 2791 u32 total_data, u32 total_size, int nr); 2792 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 2793 *root, struct btrfs_key *key, void *data, u32 data_size); 2794 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2795 struct btrfs_root *root, 2796 struct btrfs_path *path, 2797 struct btrfs_key *cpu_key, u32 *data_size, int nr); 2798 2799 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2800 struct btrfs_root *root, 2801 struct btrfs_path *path, 2802 struct btrfs_key *key, 2803 u32 data_size) 2804 { 2805 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2806 } 2807 2808 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2809 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2810 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 2811 u64 time_seq); 2812 static inline int btrfs_next_old_item(struct btrfs_root *root, 2813 struct btrfs_path *p, u64 time_seq) 2814 { 2815 ++p->slots[0]; 2816 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) 2817 return btrfs_next_old_leaf(root, p, time_seq); 2818 return 0; 2819 } 2820 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p) 2821 { 2822 return btrfs_next_old_item(root, p, 0); 2823 } 2824 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 2825 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, 2826 struct btrfs_block_rsv *block_rsv, 2827 int update_ref, int for_reloc); 2828 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2829 struct btrfs_root *root, 2830 struct extent_buffer *node, 2831 struct extent_buffer *parent); 2832 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 2833 { 2834 /* 2835 * Get synced with close_ctree() 2836 */ 2837 smp_mb(); 2838 return fs_info->closing; 2839 } 2840 2841 /* 2842 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 2843 * anything except sleeping. This function is used to check the status of 2844 * the fs. 2845 */ 2846 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root) 2847 { 2848 return (root->fs_info->sb->s_flags & MS_RDONLY || 2849 btrfs_fs_closing(root->fs_info)); 2850 } 2851 2852 static inline void free_fs_info(struct btrfs_fs_info *fs_info) 2853 { 2854 kfree(fs_info->balance_ctl); 2855 kfree(fs_info->delayed_root); 2856 kfree(fs_info->extent_root); 2857 kfree(fs_info->tree_root); 2858 kfree(fs_info->chunk_root); 2859 kfree(fs_info->dev_root); 2860 kfree(fs_info->csum_root); 2861 kfree(fs_info->quota_root); 2862 kfree(fs_info->uuid_root); 2863 kfree(fs_info->free_space_root); 2864 kfree(fs_info->super_copy); 2865 kfree(fs_info->super_for_commit); 2866 security_free_mnt_opts(&fs_info->security_opts); 2867 kfree(fs_info); 2868 } 2869 2870 /* tree mod log functions from ctree.c */ 2871 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, 2872 struct seq_list *elem); 2873 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info, 2874 struct seq_list *elem); 2875 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); 2876 2877 /* root-item.c */ 2878 int btrfs_find_root_ref(struct btrfs_root *tree_root, 2879 struct btrfs_path *path, 2880 u64 root_id, u64 ref_id); 2881 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 2882 struct btrfs_root *tree_root, 2883 u64 root_id, u64 ref_id, u64 dirid, u64 sequence, 2884 const char *name, int name_len); 2885 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, 2886 struct btrfs_root *tree_root, 2887 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, 2888 const char *name, int name_len); 2889 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2890 struct btrfs_key *key); 2891 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 2892 *root, struct btrfs_key *key, struct btrfs_root_item 2893 *item); 2894 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans, 2895 struct btrfs_root *root, 2896 struct btrfs_key *key, 2897 struct btrfs_root_item *item); 2898 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key, 2899 struct btrfs_path *path, struct btrfs_root_item *root_item, 2900 struct btrfs_key *root_key); 2901 int btrfs_find_orphan_roots(struct btrfs_root *tree_root); 2902 void btrfs_set_root_node(struct btrfs_root_item *item, 2903 struct extent_buffer *node); 2904 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 2905 void btrfs_update_root_times(struct btrfs_trans_handle *trans, 2906 struct btrfs_root *root); 2907 2908 /* uuid-tree.c */ 2909 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, 2910 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 2911 u64 subid); 2912 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans, 2913 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 2914 u64 subid); 2915 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info, 2916 int (*check_func)(struct btrfs_fs_info *, u8 *, u8, 2917 u64)); 2918 2919 /* dir-item.c */ 2920 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2921 const char *name, int name_len); 2922 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2923 struct btrfs_root *root, const char *name, 2924 int name_len, struct inode *dir, 2925 struct btrfs_key *location, u8 type, u64 index); 2926 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2927 struct btrfs_root *root, 2928 struct btrfs_path *path, u64 dir, 2929 const char *name, int name_len, 2930 int mod); 2931 struct btrfs_dir_item * 2932 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2933 struct btrfs_root *root, 2934 struct btrfs_path *path, u64 dir, 2935 u64 objectid, const char *name, int name_len, 2936 int mod); 2937 struct btrfs_dir_item * 2938 btrfs_search_dir_index_item(struct btrfs_root *root, 2939 struct btrfs_path *path, u64 dirid, 2940 const char *name, int name_len); 2941 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2942 struct btrfs_root *root, 2943 struct btrfs_path *path, 2944 struct btrfs_dir_item *di); 2945 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2946 struct btrfs_root *root, 2947 struct btrfs_path *path, u64 objectid, 2948 const char *name, u16 name_len, 2949 const void *data, u16 data_len); 2950 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2951 struct btrfs_root *root, 2952 struct btrfs_path *path, u64 dir, 2953 const char *name, u16 name_len, 2954 int mod); 2955 int verify_dir_item(struct btrfs_root *root, 2956 struct extent_buffer *leaf, 2957 struct btrfs_dir_item *dir_item); 2958 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2959 struct btrfs_path *path, 2960 const char *name, 2961 int name_len); 2962 2963 /* orphan.c */ 2964 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2965 struct btrfs_root *root, u64 offset); 2966 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2967 struct btrfs_root *root, u64 offset); 2968 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2969 2970 /* inode-item.c */ 2971 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2972 struct btrfs_root *root, 2973 const char *name, int name_len, 2974 u64 inode_objectid, u64 ref_objectid, u64 index); 2975 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2976 struct btrfs_root *root, 2977 const char *name, int name_len, 2978 u64 inode_objectid, u64 ref_objectid, u64 *index); 2979 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2980 struct btrfs_root *root, 2981 struct btrfs_path *path, u64 objectid); 2982 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2983 *root, struct btrfs_path *path, 2984 struct btrfs_key *location, int mod); 2985 2986 struct btrfs_inode_extref * 2987 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, 2988 struct btrfs_root *root, 2989 struct btrfs_path *path, 2990 const char *name, int name_len, 2991 u64 inode_objectid, u64 ref_objectid, int ins_len, 2992 int cow); 2993 2994 int btrfs_find_name_in_ext_backref(struct btrfs_path *path, 2995 u64 ref_objectid, const char *name, 2996 int name_len, 2997 struct btrfs_inode_extref **extref_ret); 2998 2999 /* file-item.c */ 3000 struct btrfs_dio_private; 3001 int btrfs_del_csums(struct btrfs_trans_handle *trans, 3002 struct btrfs_root *root, u64 bytenr, u64 len); 3003 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 3004 struct bio *bio, u32 *dst); 3005 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, 3006 struct bio *bio, u64 logical_offset); 3007 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 3008 struct btrfs_root *root, 3009 u64 objectid, u64 pos, 3010 u64 disk_offset, u64 disk_num_bytes, 3011 u64 num_bytes, u64 offset, u64 ram_bytes, 3012 u8 compression, u8 encryption, u16 other_encoding); 3013 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 3014 struct btrfs_root *root, 3015 struct btrfs_path *path, u64 objectid, 3016 u64 bytenr, int mod); 3017 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 3018 struct btrfs_root *root, 3019 struct btrfs_ordered_sum *sums); 3020 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 3021 struct bio *bio, u64 file_start, int contig); 3022 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 3023 struct list_head *list, int search_commit); 3024 void btrfs_extent_item_to_extent_map(struct inode *inode, 3025 const struct btrfs_path *path, 3026 struct btrfs_file_extent_item *fi, 3027 const bool new_inline, 3028 struct extent_map *em); 3029 3030 /* inode.c */ 3031 struct btrfs_delalloc_work { 3032 struct inode *inode; 3033 int delay_iput; 3034 struct completion completion; 3035 struct list_head list; 3036 struct btrfs_work work; 3037 }; 3038 3039 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, 3040 int delay_iput); 3041 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work); 3042 3043 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, 3044 size_t pg_offset, u64 start, u64 len, 3045 int create); 3046 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, 3047 u64 *orig_start, u64 *orig_block_len, 3048 u64 *ram_bytes); 3049 3050 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 3051 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 3052 #define ClearPageChecked ClearPageFsMisc 3053 #define SetPageChecked SetPageFsMisc 3054 #define PageChecked PageFsMisc 3055 #endif 3056 3057 /* This forces readahead on a given range of bytes in an inode */ 3058 static inline void btrfs_force_ra(struct address_space *mapping, 3059 struct file_ra_state *ra, struct file *file, 3060 pgoff_t offset, unsigned long req_size) 3061 { 3062 page_cache_sync_readahead(mapping, ra, file, offset, req_size); 3063 } 3064 3065 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 3066 int btrfs_set_inode_index(struct inode *dir, u64 *index); 3067 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 3068 struct btrfs_root *root, 3069 struct inode *dir, struct inode *inode, 3070 const char *name, int name_len); 3071 int btrfs_add_link(struct btrfs_trans_handle *trans, 3072 struct inode *parent_inode, struct inode *inode, 3073 const char *name, int name_len, int add_backref, u64 index); 3074 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, 3075 struct btrfs_root *root, 3076 struct inode *dir, u64 objectid, 3077 const char *name, int name_len); 3078 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len, 3079 int front); 3080 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 3081 struct btrfs_root *root, 3082 struct inode *inode, u64 new_size, 3083 u32 min_type); 3084 3085 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput); 3086 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, 3087 int nr); 3088 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, 3089 struct extent_state **cached_state); 3090 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 3091 struct btrfs_root *new_root, 3092 struct btrfs_root *parent_root, 3093 u64 new_dirid); 3094 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset, 3095 size_t size, struct bio *bio, 3096 unsigned long bio_flags); 3097 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 3098 int btrfs_readpage(struct file *file, struct page *page); 3099 void btrfs_evict_inode(struct inode *inode); 3100 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 3101 struct inode *btrfs_alloc_inode(struct super_block *sb); 3102 void btrfs_destroy_inode(struct inode *inode); 3103 int btrfs_drop_inode(struct inode *inode); 3104 int btrfs_init_cachep(void); 3105 void btrfs_destroy_cachep(void); 3106 long btrfs_ioctl_trans_end(struct file *file); 3107 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 3108 struct btrfs_root *root, int *was_new); 3109 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 3110 size_t pg_offset, u64 start, u64 end, 3111 int create); 3112 int btrfs_update_inode(struct btrfs_trans_handle *trans, 3113 struct btrfs_root *root, 3114 struct inode *inode); 3115 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 3116 struct btrfs_root *root, struct inode *inode); 3117 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 3118 int btrfs_orphan_cleanup(struct btrfs_root *root); 3119 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, 3120 struct btrfs_root *root); 3121 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 3122 void btrfs_invalidate_inodes(struct btrfs_root *root); 3123 void btrfs_add_delayed_iput(struct inode *inode); 3124 void btrfs_run_delayed_iputs(struct btrfs_root *root); 3125 int btrfs_prealloc_file_range(struct inode *inode, int mode, 3126 u64 start, u64 num_bytes, u64 min_size, 3127 loff_t actual_len, u64 *alloc_hint); 3128 int btrfs_prealloc_file_range_trans(struct inode *inode, 3129 struct btrfs_trans_handle *trans, int mode, 3130 u64 start, u64 num_bytes, u64 min_size, 3131 loff_t actual_len, u64 *alloc_hint); 3132 int btrfs_inode_check_errors(struct inode *inode); 3133 extern const struct dentry_operations btrfs_dentry_operations; 3134 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3135 void btrfs_test_inode_set_ops(struct inode *inode); 3136 #endif 3137 3138 /* ioctl.c */ 3139 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3140 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3141 int btrfs_ioctl_get_supported_features(void __user *arg); 3142 void btrfs_update_iflags(struct inode *inode); 3143 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); 3144 int btrfs_is_empty_uuid(u8 *uuid); 3145 int btrfs_defrag_file(struct inode *inode, struct file *file, 3146 struct btrfs_ioctl_defrag_range_args *range, 3147 u64 newer_than, unsigned long max_pages); 3148 void btrfs_get_block_group_info(struct list_head *groups_list, 3149 struct btrfs_ioctl_space_info *space); 3150 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3151 struct btrfs_ioctl_balance_args *bargs); 3152 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, 3153 struct file *dst_file, u64 dst_loff); 3154 3155 /* file.c */ 3156 int btrfs_auto_defrag_init(void); 3157 void btrfs_auto_defrag_exit(void); 3158 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, 3159 struct inode *inode); 3160 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); 3161 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info); 3162 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); 3163 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 3164 int skip_pinned); 3165 extern const struct file_operations btrfs_file_operations; 3166 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, 3167 struct btrfs_root *root, struct inode *inode, 3168 struct btrfs_path *path, u64 start, u64 end, 3169 u64 *drop_end, int drop_cache, 3170 int replace_extent, 3171 u32 extent_item_size, 3172 int *key_inserted); 3173 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 3174 struct btrfs_root *root, struct inode *inode, u64 start, 3175 u64 end, int drop_cache); 3176 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 3177 struct inode *inode, u64 start, u64 end); 3178 int btrfs_release_file(struct inode *inode, struct file *file); 3179 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, 3180 struct page **pages, size_t num_pages, 3181 loff_t pos, size_t write_bytes, 3182 struct extent_state **cached); 3183 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end); 3184 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, 3185 struct file *file_out, loff_t pos_out, 3186 size_t len, unsigned int flags); 3187 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in, 3188 struct file *file_out, loff_t pos_out, u64 len); 3189 3190 /* tree-defrag.c */ 3191 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 3192 struct btrfs_root *root); 3193 3194 /* sysfs.c */ 3195 int btrfs_init_sysfs(void); 3196 void btrfs_exit_sysfs(void); 3197 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info); 3198 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info); 3199 3200 /* xattr.c */ 3201 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 3202 3203 /* super.c */ 3204 int btrfs_parse_options(struct btrfs_root *root, char *options, 3205 unsigned long new_flags); 3206 int btrfs_sync_fs(struct super_block *sb, int wait); 3207 3208 #ifdef CONFIG_PRINTK 3209 __printf(2, 3) 3210 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); 3211 #else 3212 static inline __printf(2, 3) 3213 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 3214 { 3215 } 3216 #endif 3217 3218 #define btrfs_emerg(fs_info, fmt, args...) \ 3219 btrfs_printk(fs_info, KERN_EMERG fmt, ##args) 3220 #define btrfs_alert(fs_info, fmt, args...) \ 3221 btrfs_printk(fs_info, KERN_ALERT fmt, ##args) 3222 #define btrfs_crit(fs_info, fmt, args...) \ 3223 btrfs_printk(fs_info, KERN_CRIT fmt, ##args) 3224 #define btrfs_err(fs_info, fmt, args...) \ 3225 btrfs_printk(fs_info, KERN_ERR fmt, ##args) 3226 #define btrfs_warn(fs_info, fmt, args...) \ 3227 btrfs_printk(fs_info, KERN_WARNING fmt, ##args) 3228 #define btrfs_notice(fs_info, fmt, args...) \ 3229 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) 3230 #define btrfs_info(fs_info, fmt, args...) \ 3231 btrfs_printk(fs_info, KERN_INFO fmt, ##args) 3232 3233 /* 3234 * Wrappers that use printk_in_rcu 3235 */ 3236 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \ 3237 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3238 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \ 3239 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3240 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \ 3241 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3242 #define btrfs_err_in_rcu(fs_info, fmt, args...) \ 3243 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args) 3244 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \ 3245 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3246 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \ 3247 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3248 #define btrfs_info_in_rcu(fs_info, fmt, args...) \ 3249 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args) 3250 3251 /* 3252 * Wrappers that use a ratelimited printk_in_rcu 3253 */ 3254 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \ 3255 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3256 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \ 3257 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3258 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \ 3259 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3260 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \ 3261 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) 3262 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \ 3263 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3264 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \ 3265 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3266 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \ 3267 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) 3268 3269 /* 3270 * Wrappers that use a ratelimited printk 3271 */ 3272 #define btrfs_emerg_rl(fs_info, fmt, args...) \ 3273 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args) 3274 #define btrfs_alert_rl(fs_info, fmt, args...) \ 3275 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args) 3276 #define btrfs_crit_rl(fs_info, fmt, args...) \ 3277 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args) 3278 #define btrfs_err_rl(fs_info, fmt, args...) \ 3279 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args) 3280 #define btrfs_warn_rl(fs_info, fmt, args...) \ 3281 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args) 3282 #define btrfs_notice_rl(fs_info, fmt, args...) \ 3283 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args) 3284 #define btrfs_info_rl(fs_info, fmt, args...) \ 3285 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args) 3286 #ifdef DEBUG 3287 #define btrfs_debug(fs_info, fmt, args...) \ 3288 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) 3289 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3290 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3291 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3292 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3293 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3294 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args) 3295 #else 3296 #define btrfs_debug(fs_info, fmt, args...) \ 3297 no_printk(KERN_DEBUG fmt, ##args) 3298 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3299 no_printk(KERN_DEBUG fmt, ##args) 3300 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3301 no_printk(KERN_DEBUG fmt, ##args) 3302 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3303 no_printk(KERN_DEBUG fmt, ##args) 3304 #endif 3305 3306 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \ 3307 do { \ 3308 rcu_read_lock(); \ 3309 btrfs_printk(fs_info, fmt, ##args); \ 3310 rcu_read_unlock(); \ 3311 } while (0) 3312 3313 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \ 3314 do { \ 3315 static DEFINE_RATELIMIT_STATE(_rs, \ 3316 DEFAULT_RATELIMIT_INTERVAL, \ 3317 DEFAULT_RATELIMIT_BURST); \ 3318 if (__ratelimit(&_rs)) \ 3319 btrfs_printk(fs_info, fmt, ##args); \ 3320 } while (0) 3321 3322 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ 3323 do { \ 3324 rcu_read_lock(); \ 3325 btrfs_printk_ratelimited(fs_info, fmt, ##args); \ 3326 rcu_read_unlock(); \ 3327 } while (0) 3328 3329 #ifdef CONFIG_BTRFS_ASSERT 3330 3331 __cold 3332 static inline void assfail(char *expr, char *file, int line) 3333 { 3334 pr_err("BTRFS: assertion failed: %s, file: %s, line: %d", 3335 expr, file, line); 3336 BUG(); 3337 } 3338 3339 #define ASSERT(expr) \ 3340 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 3341 #else 3342 #define ASSERT(expr) ((void)0) 3343 #endif 3344 3345 __printf(5, 6) 3346 __cold 3347 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 3348 unsigned int line, int errno, const char *fmt, ...); 3349 3350 const char *btrfs_decode_error(int errno); 3351 3352 __cold 3353 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 3354 struct btrfs_root *root, const char *function, 3355 unsigned int line, int errno); 3356 3357 /* 3358 * Call btrfs_abort_transaction as early as possible when an error condition is 3359 * detected, that way the exact line number is reported. 3360 */ 3361 #define btrfs_abort_transaction(trans, root, errno) \ 3362 do { \ 3363 /* Report first abort since mount */ \ 3364 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \ 3365 &((root)->fs_info->fs_state))) { \ 3366 WARN(1, KERN_DEBUG \ 3367 "BTRFS: Transaction aborted (error %d)\n", \ 3368 (errno)); \ 3369 } \ 3370 __btrfs_abort_transaction((trans), (root), __func__, \ 3371 __LINE__, (errno)); \ 3372 } while (0) 3373 3374 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \ 3375 do { \ 3376 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \ 3377 (errno), fmt, ##args); \ 3378 } while (0) 3379 3380 __printf(5, 6) 3381 __cold 3382 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3383 unsigned int line, int errno, const char *fmt, ...); 3384 /* 3385 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic 3386 * will panic(). Otherwise we BUG() here. 3387 */ 3388 #define btrfs_panic(fs_info, errno, fmt, args...) \ 3389 do { \ 3390 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \ 3391 BUG(); \ 3392 } while (0) 3393 3394 3395 /* compatibility and incompatibility defines */ 3396 3397 #define btrfs_set_fs_incompat(__fs_info, opt) \ 3398 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3399 3400 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, 3401 u64 flag) 3402 { 3403 struct btrfs_super_block *disk_super; 3404 u64 features; 3405 3406 disk_super = fs_info->super_copy; 3407 features = btrfs_super_incompat_flags(disk_super); 3408 if (!(features & flag)) { 3409 spin_lock(&fs_info->super_lock); 3410 features = btrfs_super_incompat_flags(disk_super); 3411 if (!(features & flag)) { 3412 features |= flag; 3413 btrfs_set_super_incompat_flags(disk_super, features); 3414 btrfs_info(fs_info, "setting %llu feature flag", 3415 flag); 3416 } 3417 spin_unlock(&fs_info->super_lock); 3418 } 3419 } 3420 3421 #define btrfs_clear_fs_incompat(__fs_info, opt) \ 3422 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3423 3424 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, 3425 u64 flag) 3426 { 3427 struct btrfs_super_block *disk_super; 3428 u64 features; 3429 3430 disk_super = fs_info->super_copy; 3431 features = btrfs_super_incompat_flags(disk_super); 3432 if (features & flag) { 3433 spin_lock(&fs_info->super_lock); 3434 features = btrfs_super_incompat_flags(disk_super); 3435 if (features & flag) { 3436 features &= ~flag; 3437 btrfs_set_super_incompat_flags(disk_super, features); 3438 btrfs_info(fs_info, "clearing %llu feature flag", 3439 flag); 3440 } 3441 spin_unlock(&fs_info->super_lock); 3442 } 3443 } 3444 3445 #define btrfs_fs_incompat(fs_info, opt) \ 3446 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3447 3448 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag) 3449 { 3450 struct btrfs_super_block *disk_super; 3451 disk_super = fs_info->super_copy; 3452 return !!(btrfs_super_incompat_flags(disk_super) & flag); 3453 } 3454 3455 #define btrfs_set_fs_compat_ro(__fs_info, opt) \ 3456 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3457 3458 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, 3459 u64 flag) 3460 { 3461 struct btrfs_super_block *disk_super; 3462 u64 features; 3463 3464 disk_super = fs_info->super_copy; 3465 features = btrfs_super_compat_ro_flags(disk_super); 3466 if (!(features & flag)) { 3467 spin_lock(&fs_info->super_lock); 3468 features = btrfs_super_compat_ro_flags(disk_super); 3469 if (!(features & flag)) { 3470 features |= flag; 3471 btrfs_set_super_compat_ro_flags(disk_super, features); 3472 btrfs_info(fs_info, "setting %llu ro feature flag", 3473 flag); 3474 } 3475 spin_unlock(&fs_info->super_lock); 3476 } 3477 } 3478 3479 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ 3480 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3481 3482 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, 3483 u64 flag) 3484 { 3485 struct btrfs_super_block *disk_super; 3486 u64 features; 3487 3488 disk_super = fs_info->super_copy; 3489 features = btrfs_super_compat_ro_flags(disk_super); 3490 if (features & flag) { 3491 spin_lock(&fs_info->super_lock); 3492 features = btrfs_super_compat_ro_flags(disk_super); 3493 if (features & flag) { 3494 features &= ~flag; 3495 btrfs_set_super_compat_ro_flags(disk_super, features); 3496 btrfs_info(fs_info, "clearing %llu ro feature flag", 3497 flag); 3498 } 3499 spin_unlock(&fs_info->super_lock); 3500 } 3501 } 3502 3503 #define btrfs_fs_compat_ro(fs_info, opt) \ 3504 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3505 3506 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag) 3507 { 3508 struct btrfs_super_block *disk_super; 3509 disk_super = fs_info->super_copy; 3510 return !!(btrfs_super_compat_ro_flags(disk_super) & flag); 3511 } 3512 3513 /* acl.c */ 3514 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 3515 struct posix_acl *btrfs_get_acl(struct inode *inode, int type); 3516 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); 3517 int btrfs_init_acl(struct btrfs_trans_handle *trans, 3518 struct inode *inode, struct inode *dir); 3519 #else 3520 #define btrfs_get_acl NULL 3521 #define btrfs_set_acl NULL 3522 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, 3523 struct inode *inode, struct inode *dir) 3524 { 3525 return 0; 3526 } 3527 #endif 3528 3529 /* relocation.c */ 3530 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 3531 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 3532 struct btrfs_root *root); 3533 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 3534 struct btrfs_root *root); 3535 int btrfs_recover_relocation(struct btrfs_root *root); 3536 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 3537 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 3538 struct btrfs_root *root, struct extent_buffer *buf, 3539 struct extent_buffer *cow); 3540 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 3541 u64 *bytes_to_reserve); 3542 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 3543 struct btrfs_pending_snapshot *pending); 3544 3545 /* scrub.c */ 3546 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, 3547 u64 end, struct btrfs_scrub_progress *progress, 3548 int readonly, int is_dev_replace); 3549 void btrfs_scrub_pause(struct btrfs_root *root); 3550 void btrfs_scrub_continue(struct btrfs_root *root); 3551 int btrfs_scrub_cancel(struct btrfs_fs_info *info); 3552 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info, 3553 struct btrfs_device *dev); 3554 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, 3555 struct btrfs_scrub_progress *progress); 3556 3557 /* dev-replace.c */ 3558 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info); 3559 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info); 3560 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount); 3561 3562 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) 3563 { 3564 btrfs_bio_counter_sub(fs_info, 1); 3565 } 3566 3567 /* reada.c */ 3568 struct reada_control { 3569 struct btrfs_root *root; /* tree to prefetch */ 3570 struct btrfs_key key_start; 3571 struct btrfs_key key_end; /* exclusive */ 3572 atomic_t elems; 3573 struct kref refcnt; 3574 wait_queue_head_t wait; 3575 }; 3576 struct reada_control *btrfs_reada_add(struct btrfs_root *root, 3577 struct btrfs_key *start, struct btrfs_key *end); 3578 int btrfs_reada_wait(void *handle); 3579 void btrfs_reada_detach(void *handle); 3580 int btree_readahead_hook(struct btrfs_fs_info *fs_info, 3581 struct extent_buffer *eb, u64 start, int err); 3582 3583 static inline int is_fstree(u64 rootid) 3584 { 3585 if (rootid == BTRFS_FS_TREE_OBJECTID || 3586 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID && 3587 !btrfs_qgroup_level(rootid))) 3588 return 1; 3589 return 0; 3590 } 3591 3592 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) 3593 { 3594 return signal_pending(current); 3595 } 3596 3597 /* Sanity test specific functions */ 3598 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3599 void btrfs_test_destroy_inode(struct inode *inode); 3600 #endif 3601 3602 static inline int btrfs_test_is_dummy_root(struct btrfs_root *root) 3603 { 3604 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3605 if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) 3606 return 1; 3607 #endif 3608 return 0; 3609 } 3610 3611 #endif 3612