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 struct list_head priority_tickets; 443 struct list_head tickets; 444 445 struct rw_semaphore groups_sem; 446 /* for block groups in our same type */ 447 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 448 wait_queue_head_t wait; 449 450 struct kobject kobj; 451 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES]; 452 }; 453 454 #define BTRFS_BLOCK_RSV_GLOBAL 1 455 #define BTRFS_BLOCK_RSV_DELALLOC 2 456 #define BTRFS_BLOCK_RSV_TRANS 3 457 #define BTRFS_BLOCK_RSV_CHUNK 4 458 #define BTRFS_BLOCK_RSV_DELOPS 5 459 #define BTRFS_BLOCK_RSV_EMPTY 6 460 #define BTRFS_BLOCK_RSV_TEMP 7 461 462 struct btrfs_block_rsv { 463 u64 size; 464 u64 reserved; 465 struct btrfs_space_info *space_info; 466 spinlock_t lock; 467 unsigned short full; 468 unsigned short type; 469 unsigned short failfast; 470 }; 471 472 /* 473 * free clusters are used to claim free space in relatively large chunks, 474 * allowing us to do less seeky writes. They are used for all metadata 475 * allocations and data allocations in ssd mode. 476 */ 477 struct btrfs_free_cluster { 478 spinlock_t lock; 479 spinlock_t refill_lock; 480 struct rb_root root; 481 482 /* largest extent in this cluster */ 483 u64 max_size; 484 485 /* first extent starting offset */ 486 u64 window_start; 487 488 /* We did a full search and couldn't create a cluster */ 489 bool fragmented; 490 491 struct btrfs_block_group_cache *block_group; 492 /* 493 * when a cluster is allocated from a block group, we put the 494 * cluster onto a list in the block group so that it can 495 * be freed before the block group is freed. 496 */ 497 struct list_head block_group_list; 498 }; 499 500 enum btrfs_caching_type { 501 BTRFS_CACHE_NO = 0, 502 BTRFS_CACHE_STARTED = 1, 503 BTRFS_CACHE_FAST = 2, 504 BTRFS_CACHE_FINISHED = 3, 505 BTRFS_CACHE_ERROR = 4, 506 }; 507 508 enum btrfs_disk_cache_state { 509 BTRFS_DC_WRITTEN = 0, 510 BTRFS_DC_ERROR = 1, 511 BTRFS_DC_CLEAR = 2, 512 BTRFS_DC_SETUP = 3, 513 }; 514 515 struct btrfs_caching_control { 516 struct list_head list; 517 struct mutex mutex; 518 wait_queue_head_t wait; 519 struct btrfs_work work; 520 struct btrfs_block_group_cache *block_group; 521 u64 progress; 522 atomic_t count; 523 }; 524 525 /* Once caching_thread() finds this much free space, it will wake up waiters. */ 526 #define CACHING_CTL_WAKE_UP (1024 * 1024 * 2) 527 528 struct btrfs_io_ctl { 529 void *cur, *orig; 530 struct page *page; 531 struct page **pages; 532 struct btrfs_root *root; 533 struct inode *inode; 534 unsigned long size; 535 int index; 536 int num_pages; 537 int entries; 538 int bitmaps; 539 unsigned check_crcs:1; 540 }; 541 542 struct btrfs_block_group_cache { 543 struct btrfs_key key; 544 struct btrfs_block_group_item item; 545 struct btrfs_fs_info *fs_info; 546 struct inode *inode; 547 spinlock_t lock; 548 u64 pinned; 549 u64 reserved; 550 u64 delalloc_bytes; 551 u64 bytes_super; 552 u64 flags; 553 u64 cache_generation; 554 u32 sectorsize; 555 556 /* 557 * If the free space extent count exceeds this number, convert the block 558 * group to bitmaps. 559 */ 560 u32 bitmap_high_thresh; 561 562 /* 563 * If the free space extent count drops below this number, convert the 564 * block group back to extents. 565 */ 566 u32 bitmap_low_thresh; 567 568 /* 569 * It is just used for the delayed data space allocation because 570 * only the data space allocation and the relative metadata update 571 * can be done cross the transaction. 572 */ 573 struct rw_semaphore data_rwsem; 574 575 /* for raid56, this is a full stripe, without parity */ 576 unsigned long full_stripe_len; 577 578 unsigned int ro; 579 unsigned int iref:1; 580 unsigned int has_caching_ctl:1; 581 unsigned int removed:1; 582 583 int disk_cache_state; 584 585 /* cache tracking stuff */ 586 int cached; 587 struct btrfs_caching_control *caching_ctl; 588 u64 last_byte_to_unpin; 589 590 struct btrfs_space_info *space_info; 591 592 /* free space cache stuff */ 593 struct btrfs_free_space_ctl *free_space_ctl; 594 595 /* block group cache stuff */ 596 struct rb_node cache_node; 597 598 /* for block groups in the same raid type */ 599 struct list_head list; 600 601 /* usage count */ 602 atomic_t count; 603 604 /* List of struct btrfs_free_clusters for this block group. 605 * Today it will only have one thing on it, but that may change 606 */ 607 struct list_head cluster_list; 608 609 /* For delayed block group creation or deletion of empty block groups */ 610 struct list_head bg_list; 611 612 /* For read-only block groups */ 613 struct list_head ro_list; 614 615 atomic_t trimming; 616 617 /* For dirty block groups */ 618 struct list_head dirty_list; 619 struct list_head io_list; 620 621 struct btrfs_io_ctl io_ctl; 622 623 /* 624 * Incremented when doing extent allocations and holding a read lock 625 * on the space_info's groups_sem semaphore. 626 * Decremented when an ordered extent that represents an IO against this 627 * block group's range is created (after it's added to its inode's 628 * root's list of ordered extents) or immediately after the allocation 629 * if it's a metadata extent or fallocate extent (for these cases we 630 * don't create ordered extents). 631 */ 632 atomic_t reservations; 633 634 /* 635 * Incremented while holding the spinlock *lock* by a task checking if 636 * it can perform a nocow write (incremented if the value for the *ro* 637 * field is 0). Decremented by such tasks once they create an ordered 638 * extent or before that if some error happens before reaching that step. 639 * This is to prevent races between block group relocation and nocow 640 * writes through direct IO. 641 */ 642 atomic_t nocow_writers; 643 644 /* Lock for free space tree operations. */ 645 struct mutex free_space_lock; 646 647 /* 648 * Does the block group need to be added to the free space tree? 649 * Protected by free_space_lock. 650 */ 651 int needs_free_space; 652 }; 653 654 /* delayed seq elem */ 655 struct seq_list { 656 struct list_head list; 657 u64 seq; 658 }; 659 660 #define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 } 661 662 enum btrfs_orphan_cleanup_state { 663 ORPHAN_CLEANUP_STARTED = 1, 664 ORPHAN_CLEANUP_DONE = 2, 665 }; 666 667 /* used by the raid56 code to lock stripes for read/modify/write */ 668 struct btrfs_stripe_hash { 669 struct list_head hash_list; 670 wait_queue_head_t wait; 671 spinlock_t lock; 672 }; 673 674 /* used by the raid56 code to lock stripes for read/modify/write */ 675 struct btrfs_stripe_hash_table { 676 struct list_head stripe_cache; 677 spinlock_t cache_lock; 678 int cache_size; 679 struct btrfs_stripe_hash table[]; 680 }; 681 682 #define BTRFS_STRIPE_HASH_TABLE_BITS 11 683 684 void btrfs_init_async_reclaim_work(struct work_struct *work); 685 686 /* fs_info */ 687 struct reloc_control; 688 struct btrfs_device; 689 struct btrfs_fs_devices; 690 struct btrfs_balance_control; 691 struct btrfs_delayed_root; 692 struct btrfs_fs_info { 693 u8 fsid[BTRFS_FSID_SIZE]; 694 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 695 struct btrfs_root *extent_root; 696 struct btrfs_root *tree_root; 697 struct btrfs_root *chunk_root; 698 struct btrfs_root *dev_root; 699 struct btrfs_root *fs_root; 700 struct btrfs_root *csum_root; 701 struct btrfs_root *quota_root; 702 struct btrfs_root *uuid_root; 703 struct btrfs_root *free_space_root; 704 705 /* the log root tree is a directory of all the other log roots */ 706 struct btrfs_root *log_root_tree; 707 708 spinlock_t fs_roots_radix_lock; 709 struct radix_tree_root fs_roots_radix; 710 711 /* block group cache stuff */ 712 spinlock_t block_group_cache_lock; 713 u64 first_logical_byte; 714 struct rb_root block_group_cache_tree; 715 716 /* keep track of unallocated space */ 717 spinlock_t free_chunk_lock; 718 u64 free_chunk_space; 719 720 struct extent_io_tree freed_extents[2]; 721 struct extent_io_tree *pinned_extents; 722 723 /* logical->physical extent mapping */ 724 struct btrfs_mapping_tree mapping_tree; 725 726 /* 727 * block reservation for extent, checksum, root tree and 728 * delayed dir index item 729 */ 730 struct btrfs_block_rsv global_block_rsv; 731 /* block reservation for delay allocation */ 732 struct btrfs_block_rsv delalloc_block_rsv; 733 /* block reservation for metadata operations */ 734 struct btrfs_block_rsv trans_block_rsv; 735 /* block reservation for chunk tree */ 736 struct btrfs_block_rsv chunk_block_rsv; 737 /* block reservation for delayed operations */ 738 struct btrfs_block_rsv delayed_block_rsv; 739 740 struct btrfs_block_rsv empty_block_rsv; 741 742 u64 generation; 743 u64 last_trans_committed; 744 u64 avg_delayed_ref_runtime; 745 746 /* 747 * this is updated to the current trans every time a full commit 748 * is required instead of the faster short fsync log commits 749 */ 750 u64 last_trans_log_full_commit; 751 unsigned long mount_opt; 752 /* 753 * Track requests for actions that need to be done during transaction 754 * commit (like for some mount options). 755 */ 756 unsigned long pending_changes; 757 unsigned long compress_type:4; 758 int commit_interval; 759 /* 760 * It is a suggestive number, the read side is safe even it gets a 761 * wrong number because we will write out the data into a regular 762 * extent. The write side(mount/remount) is under ->s_umount lock, 763 * so it is also safe. 764 */ 765 u64 max_inline; 766 /* 767 * Protected by ->chunk_mutex and sb->s_umount. 768 * 769 * The reason that we use two lock to protect it is because only 770 * remount and mount operations can change it and these two operations 771 * are under sb->s_umount, but the read side (chunk allocation) can not 772 * acquire sb->s_umount or the deadlock would happen. So we use two 773 * locks to protect it. On the write side, we must acquire two locks, 774 * and on the read side, we just need acquire one of them. 775 */ 776 u64 alloc_start; 777 struct btrfs_transaction *running_transaction; 778 wait_queue_head_t transaction_throttle; 779 wait_queue_head_t transaction_wait; 780 wait_queue_head_t transaction_blocked_wait; 781 wait_queue_head_t async_submit_wait; 782 783 /* 784 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 785 * when they are updated. 786 * 787 * Because we do not clear the flags for ever, so we needn't use 788 * the lock on the read side. 789 * 790 * We also needn't use the lock when we mount the fs, because 791 * there is no other task which will update the flag. 792 */ 793 spinlock_t super_lock; 794 struct btrfs_super_block *super_copy; 795 struct btrfs_super_block *super_for_commit; 796 struct block_device *__bdev; 797 struct super_block *sb; 798 struct inode *btree_inode; 799 struct backing_dev_info bdi; 800 struct mutex tree_log_mutex; 801 struct mutex transaction_kthread_mutex; 802 struct mutex cleaner_mutex; 803 struct mutex chunk_mutex; 804 struct mutex volume_mutex; 805 806 /* 807 * this is taken to make sure we don't set block groups ro after 808 * the free space cache has been allocated on them 809 */ 810 struct mutex ro_block_group_mutex; 811 812 /* this is used during read/modify/write to make sure 813 * no two ios are trying to mod the same stripe at the same 814 * time 815 */ 816 struct btrfs_stripe_hash_table *stripe_hash_table; 817 818 /* 819 * this protects the ordered operations list only while we are 820 * processing all of the entries on it. This way we make 821 * sure the commit code doesn't find the list temporarily empty 822 * because another function happens to be doing non-waiting preflush 823 * before jumping into the main commit. 824 */ 825 struct mutex ordered_operations_mutex; 826 827 struct rw_semaphore commit_root_sem; 828 829 struct rw_semaphore cleanup_work_sem; 830 831 struct rw_semaphore subvol_sem; 832 struct srcu_struct subvol_srcu; 833 834 spinlock_t trans_lock; 835 /* 836 * the reloc mutex goes with the trans lock, it is taken 837 * during commit to protect us from the relocation code 838 */ 839 struct mutex reloc_mutex; 840 841 struct list_head trans_list; 842 struct list_head dead_roots; 843 struct list_head caching_block_groups; 844 845 spinlock_t delayed_iput_lock; 846 struct list_head delayed_iputs; 847 struct mutex cleaner_delayed_iput_mutex; 848 849 /* this protects tree_mod_seq_list */ 850 spinlock_t tree_mod_seq_lock; 851 atomic64_t tree_mod_seq; 852 struct list_head tree_mod_seq_list; 853 854 /* this protects tree_mod_log */ 855 rwlock_t tree_mod_log_lock; 856 struct rb_root tree_mod_log; 857 858 atomic_t nr_async_submits; 859 atomic_t async_submit_draining; 860 atomic_t nr_async_bios; 861 atomic_t async_delalloc_pages; 862 atomic_t open_ioctl_trans; 863 864 /* 865 * this is used to protect the following list -- ordered_roots. 866 */ 867 spinlock_t ordered_root_lock; 868 869 /* 870 * all fs/file tree roots in which there are data=ordered extents 871 * pending writeback are added into this list. 872 * 873 * these can span multiple transactions and basically include 874 * every dirty data page that isn't from nodatacow 875 */ 876 struct list_head ordered_roots; 877 878 struct mutex delalloc_root_mutex; 879 spinlock_t delalloc_root_lock; 880 /* all fs/file tree roots that have delalloc inodes. */ 881 struct list_head delalloc_roots; 882 883 /* 884 * there is a pool of worker threads for checksumming during writes 885 * and a pool for checksumming after reads. This is because readers 886 * can run with FS locks held, and the writers may be waiting for 887 * those locks. We don't want ordering in the pending list to cause 888 * deadlocks, and so the two are serviced separately. 889 * 890 * A third pool does submit_bio to avoid deadlocking with the other 891 * two 892 */ 893 struct btrfs_workqueue *workers; 894 struct btrfs_workqueue *delalloc_workers; 895 struct btrfs_workqueue *flush_workers; 896 struct btrfs_workqueue *endio_workers; 897 struct btrfs_workqueue *endio_meta_workers; 898 struct btrfs_workqueue *endio_raid56_workers; 899 struct btrfs_workqueue *endio_repair_workers; 900 struct btrfs_workqueue *rmw_workers; 901 struct btrfs_workqueue *endio_meta_write_workers; 902 struct btrfs_workqueue *endio_write_workers; 903 struct btrfs_workqueue *endio_freespace_worker; 904 struct btrfs_workqueue *submit_workers; 905 struct btrfs_workqueue *caching_workers; 906 struct btrfs_workqueue *readahead_workers; 907 908 /* 909 * fixup workers take dirty pages that didn't properly go through 910 * the cow mechanism and make them safe to write. It happens 911 * for the sys_munmap function call path 912 */ 913 struct btrfs_workqueue *fixup_workers; 914 struct btrfs_workqueue *delayed_workers; 915 916 /* the extent workers do delayed refs on the extent allocation tree */ 917 struct btrfs_workqueue *extent_workers; 918 struct task_struct *transaction_kthread; 919 struct task_struct *cleaner_kthread; 920 int thread_pool_size; 921 922 struct kobject *space_info_kobj; 923 int do_barriers; 924 int closing; 925 int log_root_recovering; 926 int open; 927 928 u64 total_pinned; 929 930 /* used to keep from writing metadata until there is a nice batch */ 931 struct percpu_counter dirty_metadata_bytes; 932 struct percpu_counter delalloc_bytes; 933 s32 dirty_metadata_batch; 934 s32 delalloc_batch; 935 936 struct list_head dirty_cowonly_roots; 937 938 struct btrfs_fs_devices *fs_devices; 939 940 /* 941 * the space_info list is almost entirely read only. It only changes 942 * when we add a new raid type to the FS, and that happens 943 * very rarely. RCU is used to protect it. 944 */ 945 struct list_head space_info; 946 947 struct btrfs_space_info *data_sinfo; 948 949 struct reloc_control *reloc_ctl; 950 951 /* data_alloc_cluster is only used in ssd mode */ 952 struct btrfs_free_cluster data_alloc_cluster; 953 954 /* all metadata allocations go through this cluster */ 955 struct btrfs_free_cluster meta_alloc_cluster; 956 957 /* auto defrag inodes go here */ 958 spinlock_t defrag_inodes_lock; 959 struct rb_root defrag_inodes; 960 atomic_t defrag_running; 961 962 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 963 seqlock_t profiles_lock; 964 /* 965 * these three are in extended format (availability of single 966 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other 967 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits) 968 */ 969 u64 avail_data_alloc_bits; 970 u64 avail_metadata_alloc_bits; 971 u64 avail_system_alloc_bits; 972 973 /* restriper state */ 974 spinlock_t balance_lock; 975 struct mutex balance_mutex; 976 atomic_t balance_running; 977 atomic_t balance_pause_req; 978 atomic_t balance_cancel_req; 979 struct btrfs_balance_control *balance_ctl; 980 wait_queue_head_t balance_wait_q; 981 982 unsigned data_chunk_allocations; 983 unsigned metadata_ratio; 984 985 void *bdev_holder; 986 987 /* private scrub information */ 988 struct mutex scrub_lock; 989 atomic_t scrubs_running; 990 atomic_t scrub_pause_req; 991 atomic_t scrubs_paused; 992 atomic_t scrub_cancel_req; 993 wait_queue_head_t scrub_pause_wait; 994 int scrub_workers_refcnt; 995 struct btrfs_workqueue *scrub_workers; 996 struct btrfs_workqueue *scrub_wr_completion_workers; 997 struct btrfs_workqueue *scrub_nocow_workers; 998 struct btrfs_workqueue *scrub_parity_workers; 999 1000 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1001 u32 check_integrity_print_mask; 1002 #endif 1003 /* 1004 * quota information 1005 */ 1006 unsigned int quota_enabled:1; 1007 1008 /* 1009 * quota_enabled only changes state after a commit. This holds the 1010 * next state. 1011 */ 1012 unsigned int pending_quota_state:1; 1013 1014 /* is qgroup tracking in a consistent state? */ 1015 u64 qgroup_flags; 1016 1017 /* holds configuration and tracking. Protected by qgroup_lock */ 1018 struct rb_root qgroup_tree; 1019 struct rb_root qgroup_op_tree; 1020 spinlock_t qgroup_lock; 1021 spinlock_t qgroup_op_lock; 1022 atomic_t qgroup_op_seq; 1023 1024 /* 1025 * used to avoid frequently calling ulist_alloc()/ulist_free() 1026 * when doing qgroup accounting, it must be protected by qgroup_lock. 1027 */ 1028 struct ulist *qgroup_ulist; 1029 1030 /* protect user change for quota operations */ 1031 struct mutex qgroup_ioctl_lock; 1032 1033 /* list of dirty qgroups to be written at next commit */ 1034 struct list_head dirty_qgroups; 1035 1036 /* used by qgroup for an efficient tree traversal */ 1037 u64 qgroup_seq; 1038 1039 /* qgroup rescan items */ 1040 struct mutex qgroup_rescan_lock; /* protects the progress item */ 1041 struct btrfs_key qgroup_rescan_progress; 1042 struct btrfs_workqueue *qgroup_rescan_workers; 1043 struct completion qgroup_rescan_completion; 1044 struct btrfs_work qgroup_rescan_work; 1045 1046 /* filesystem state */ 1047 unsigned long fs_state; 1048 1049 struct btrfs_delayed_root *delayed_root; 1050 1051 /* readahead tree */ 1052 spinlock_t reada_lock; 1053 struct radix_tree_root reada_tree; 1054 1055 /* readahead works cnt */ 1056 atomic_t reada_works_cnt; 1057 1058 /* Extent buffer radix tree */ 1059 spinlock_t buffer_lock; 1060 struct radix_tree_root buffer_radix; 1061 1062 /* next backup root to be overwritten */ 1063 int backup_root_index; 1064 1065 int num_tolerated_disk_barrier_failures; 1066 1067 /* device replace state */ 1068 struct btrfs_dev_replace dev_replace; 1069 1070 atomic_t mutually_exclusive_operation_running; 1071 1072 struct percpu_counter bio_counter; 1073 wait_queue_head_t replace_wait; 1074 1075 struct semaphore uuid_tree_rescan_sem; 1076 unsigned int update_uuid_tree_gen:1; 1077 1078 /* Used to reclaim the metadata space in the background. */ 1079 struct work_struct async_reclaim_work; 1080 1081 spinlock_t unused_bgs_lock; 1082 struct list_head unused_bgs; 1083 struct mutex unused_bg_unpin_mutex; 1084 struct mutex delete_unused_bgs_mutex; 1085 1086 /* For btrfs to record security options */ 1087 struct security_mnt_opts security_opts; 1088 1089 /* 1090 * Chunks that can't be freed yet (under a trim/discard operation) 1091 * and will be latter freed. Protected by fs_info->chunk_mutex. 1092 */ 1093 struct list_head pinned_chunks; 1094 1095 int creating_free_space_tree; 1096 }; 1097 1098 struct btrfs_subvolume_writers { 1099 struct percpu_counter counter; 1100 wait_queue_head_t wait; 1101 }; 1102 1103 /* 1104 * The state of btrfs root 1105 */ 1106 /* 1107 * btrfs_record_root_in_trans is a multi-step process, 1108 * and it can race with the balancing code. But the 1109 * race is very small, and only the first time the root 1110 * is added to each transaction. So IN_TRANS_SETUP 1111 * is used to tell us when more checks are required 1112 */ 1113 #define BTRFS_ROOT_IN_TRANS_SETUP 0 1114 #define BTRFS_ROOT_REF_COWS 1 1115 #define BTRFS_ROOT_TRACK_DIRTY 2 1116 #define BTRFS_ROOT_IN_RADIX 3 1117 #define BTRFS_ROOT_DUMMY_ROOT 4 1118 #define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 5 1119 #define BTRFS_ROOT_DEFRAG_RUNNING 6 1120 #define BTRFS_ROOT_FORCE_COW 7 1121 #define BTRFS_ROOT_MULTI_LOG_TASKS 8 1122 #define BTRFS_ROOT_DIRTY 9 1123 1124 /* 1125 * in ram representation of the tree. extent_root is used for all allocations 1126 * and for the extent tree extent_root root. 1127 */ 1128 struct btrfs_root { 1129 struct extent_buffer *node; 1130 1131 struct extent_buffer *commit_root; 1132 struct btrfs_root *log_root; 1133 struct btrfs_root *reloc_root; 1134 1135 unsigned long state; 1136 struct btrfs_root_item root_item; 1137 struct btrfs_key root_key; 1138 struct btrfs_fs_info *fs_info; 1139 struct extent_io_tree dirty_log_pages; 1140 1141 struct mutex objectid_mutex; 1142 1143 spinlock_t accounting_lock; 1144 struct btrfs_block_rsv *block_rsv; 1145 1146 /* free ino cache stuff */ 1147 struct btrfs_free_space_ctl *free_ino_ctl; 1148 enum btrfs_caching_type ino_cache_state; 1149 spinlock_t ino_cache_lock; 1150 wait_queue_head_t ino_cache_wait; 1151 struct btrfs_free_space_ctl *free_ino_pinned; 1152 u64 ino_cache_progress; 1153 struct inode *ino_cache_inode; 1154 1155 struct mutex log_mutex; 1156 wait_queue_head_t log_writer_wait; 1157 wait_queue_head_t log_commit_wait[2]; 1158 struct list_head log_ctxs[2]; 1159 atomic_t log_writers; 1160 atomic_t log_commit[2]; 1161 atomic_t log_batch; 1162 int log_transid; 1163 /* No matter the commit succeeds or not*/ 1164 int log_transid_committed; 1165 /* Just be updated when the commit succeeds. */ 1166 int last_log_commit; 1167 pid_t log_start_pid; 1168 1169 u64 objectid; 1170 u64 last_trans; 1171 1172 /* data allocations are done in sectorsize units */ 1173 u32 sectorsize; 1174 1175 /* node allocations are done in nodesize units */ 1176 u32 nodesize; 1177 1178 u32 stripesize; 1179 1180 u32 type; 1181 1182 u64 highest_objectid; 1183 1184 /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */ 1185 u64 alloc_bytenr; 1186 1187 u64 defrag_trans_start; 1188 struct btrfs_key defrag_progress; 1189 struct btrfs_key defrag_max; 1190 char *name; 1191 1192 /* the dirty list is only used by non-reference counted roots */ 1193 struct list_head dirty_list; 1194 1195 struct list_head root_list; 1196 1197 spinlock_t log_extents_lock[2]; 1198 struct list_head logged_list[2]; 1199 1200 spinlock_t orphan_lock; 1201 atomic_t orphan_inodes; 1202 struct btrfs_block_rsv *orphan_block_rsv; 1203 int orphan_cleanup_state; 1204 1205 spinlock_t inode_lock; 1206 /* red-black tree that keeps track of in-memory inodes */ 1207 struct rb_root inode_tree; 1208 1209 /* 1210 * radix tree that keeps track of delayed nodes of every inode, 1211 * protected by inode_lock 1212 */ 1213 struct radix_tree_root delayed_nodes_tree; 1214 /* 1215 * right now this just gets used so that a root has its own devid 1216 * for stat. It may be used for more later 1217 */ 1218 dev_t anon_dev; 1219 1220 spinlock_t root_item_lock; 1221 atomic_t refs; 1222 1223 struct mutex delalloc_mutex; 1224 spinlock_t delalloc_lock; 1225 /* 1226 * all of the inodes that have delalloc bytes. It is possible for 1227 * this list to be empty even when there is still dirty data=ordered 1228 * extents waiting to finish IO. 1229 */ 1230 struct list_head delalloc_inodes; 1231 struct list_head delalloc_root; 1232 u64 nr_delalloc_inodes; 1233 1234 struct mutex ordered_extent_mutex; 1235 /* 1236 * this is used by the balancing code to wait for all the pending 1237 * ordered extents 1238 */ 1239 spinlock_t ordered_extent_lock; 1240 1241 /* 1242 * all of the data=ordered extents pending writeback 1243 * these can span multiple transactions and basically include 1244 * every dirty data page that isn't from nodatacow 1245 */ 1246 struct list_head ordered_extents; 1247 struct list_head ordered_root; 1248 u64 nr_ordered_extents; 1249 1250 /* 1251 * Number of currently running SEND ioctls to prevent 1252 * manipulation with the read-only status via SUBVOL_SETFLAGS 1253 */ 1254 int send_in_progress; 1255 struct btrfs_subvolume_writers *subv_writers; 1256 atomic_t will_be_snapshoted; 1257 1258 /* For qgroup metadata space reserve */ 1259 atomic_t qgroup_meta_rsv; 1260 }; 1261 1262 /* 1263 * Flags for mount options. 1264 * 1265 * Note: don't forget to add new options to btrfs_show_options() 1266 */ 1267 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1268 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1269 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1270 #define BTRFS_MOUNT_SSD (1 << 3) 1271 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1272 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1273 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1274 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1275 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1276 #define BTRFS_MOUNT_NOSSD (1 << 9) 1277 #define BTRFS_MOUNT_DISCARD (1 << 10) 1278 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1279 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1280 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1281 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1282 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1283 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) 1284 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) 1285 #define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) 1286 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) 1287 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) 1288 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) 1289 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) 1290 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) 1291 #define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24) 1292 #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25) 1293 #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26) 1294 #define BTRFS_MOUNT_NOLOGREPLAY (1 << 27) 1295 1296 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 1297 #define BTRFS_DEFAULT_MAX_INLINE (2048) 1298 1299 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1300 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1301 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1302 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1303 BTRFS_MOUNT_##opt) 1304 1305 #define btrfs_set_and_info(root, opt, fmt, args...) \ 1306 { \ 1307 if (!btrfs_test_opt(root, opt)) \ 1308 btrfs_info(root->fs_info, fmt, ##args); \ 1309 btrfs_set_opt(root->fs_info->mount_opt, opt); \ 1310 } 1311 1312 #define btrfs_clear_and_info(root, opt, fmt, args...) \ 1313 { \ 1314 if (btrfs_test_opt(root, opt)) \ 1315 btrfs_info(root->fs_info, fmt, ##args); \ 1316 btrfs_clear_opt(root->fs_info->mount_opt, opt); \ 1317 } 1318 1319 #ifdef CONFIG_BTRFS_DEBUG 1320 static inline int 1321 btrfs_should_fragment_free_space(struct btrfs_root *root, 1322 struct btrfs_block_group_cache *block_group) 1323 { 1324 return (btrfs_test_opt(root, FRAGMENT_METADATA) && 1325 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) || 1326 (btrfs_test_opt(root, FRAGMENT_DATA) && 1327 block_group->flags & BTRFS_BLOCK_GROUP_DATA); 1328 } 1329 #endif 1330 1331 /* 1332 * Requests for changes that need to be done during transaction commit. 1333 * 1334 * Internal mount options that are used for special handling of the real 1335 * mount options (eg. cannot be set during remount and have to be set during 1336 * transaction commit) 1337 */ 1338 1339 #define BTRFS_PENDING_SET_INODE_MAP_CACHE (0) 1340 #define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1) 1341 #define BTRFS_PENDING_COMMIT (2) 1342 1343 #define btrfs_test_pending(info, opt) \ 1344 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1345 #define btrfs_set_pending(info, opt) \ 1346 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1347 #define btrfs_clear_pending(info, opt) \ 1348 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes) 1349 1350 /* 1351 * Helpers for setting pending mount option changes. 1352 * 1353 * Expects corresponding macros 1354 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name 1355 */ 1356 #define btrfs_set_pending_and_info(info, opt, fmt, args...) \ 1357 do { \ 1358 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1359 btrfs_info((info), fmt, ##args); \ 1360 btrfs_set_pending((info), SET_##opt); \ 1361 btrfs_clear_pending((info), CLEAR_##opt); \ 1362 } \ 1363 } while(0) 1364 1365 #define btrfs_clear_pending_and_info(info, opt, fmt, args...) \ 1366 do { \ 1367 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \ 1368 btrfs_info((info), fmt, ##args); \ 1369 btrfs_set_pending((info), CLEAR_##opt); \ 1370 btrfs_clear_pending((info), SET_##opt); \ 1371 } \ 1372 } while(0) 1373 1374 /* 1375 * Inode flags 1376 */ 1377 #define BTRFS_INODE_NODATASUM (1 << 0) 1378 #define BTRFS_INODE_NODATACOW (1 << 1) 1379 #define BTRFS_INODE_READONLY (1 << 2) 1380 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1381 #define BTRFS_INODE_PREALLOC (1 << 4) 1382 #define BTRFS_INODE_SYNC (1 << 5) 1383 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1384 #define BTRFS_INODE_APPEND (1 << 7) 1385 #define BTRFS_INODE_NODUMP (1 << 8) 1386 #define BTRFS_INODE_NOATIME (1 << 9) 1387 #define BTRFS_INODE_DIRSYNC (1 << 10) 1388 #define BTRFS_INODE_COMPRESS (1 << 11) 1389 1390 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 1391 1392 struct btrfs_map_token { 1393 struct extent_buffer *eb; 1394 char *kaddr; 1395 unsigned long offset; 1396 }; 1397 1398 #define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \ 1399 ((bytes) >> (fs_info)->sb->s_blocksize_bits) 1400 1401 static inline void btrfs_init_map_token (struct btrfs_map_token *token) 1402 { 1403 token->kaddr = NULL; 1404 } 1405 1406 /* some macros to generate set/get functions for the struct fields. This 1407 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1408 * one for u8: 1409 */ 1410 #define le8_to_cpu(v) (v) 1411 #define cpu_to_le8(v) (v) 1412 #define __le8 u8 1413 1414 #define read_eb_member(eb, ptr, type, member, result) ( \ 1415 read_extent_buffer(eb, (char *)(result), \ 1416 ((unsigned long)(ptr)) + \ 1417 offsetof(type, member), \ 1418 sizeof(((type *)0)->member))) 1419 1420 #define write_eb_member(eb, ptr, type, member, result) ( \ 1421 write_extent_buffer(eb, (char *)(result), \ 1422 ((unsigned long)(ptr)) + \ 1423 offsetof(type, member), \ 1424 sizeof(((type *)0)->member))) 1425 1426 #define DECLARE_BTRFS_SETGET_BITS(bits) \ 1427 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \ 1428 unsigned long off, \ 1429 struct btrfs_map_token *token); \ 1430 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \ 1431 unsigned long off, u##bits val, \ 1432 struct btrfs_map_token *token); \ 1433 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \ 1434 unsigned long off) \ 1435 { \ 1436 return btrfs_get_token_##bits(eb, ptr, off, NULL); \ 1437 } \ 1438 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \ 1439 unsigned long off, u##bits val) \ 1440 { \ 1441 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \ 1442 } 1443 1444 DECLARE_BTRFS_SETGET_BITS(8) 1445 DECLARE_BTRFS_SETGET_BITS(16) 1446 DECLARE_BTRFS_SETGET_BITS(32) 1447 DECLARE_BTRFS_SETGET_BITS(64) 1448 1449 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1450 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \ 1451 { \ 1452 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1453 return btrfs_get_##bits(eb, s, offsetof(type, member)); \ 1454 } \ 1455 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \ 1456 u##bits val) \ 1457 { \ 1458 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1459 btrfs_set_##bits(eb, s, offsetof(type, member), val); \ 1460 } \ 1461 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \ 1462 struct btrfs_map_token *token) \ 1463 { \ 1464 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1465 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \ 1466 } \ 1467 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \ 1468 type *s, u##bits val, \ 1469 struct btrfs_map_token *token) \ 1470 { \ 1471 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 1472 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \ 1473 } 1474 1475 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1476 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1477 { \ 1478 type *p = page_address(eb->pages[0]); \ 1479 u##bits res = le##bits##_to_cpu(p->member); \ 1480 return res; \ 1481 } \ 1482 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1483 u##bits val) \ 1484 { \ 1485 type *p = page_address(eb->pages[0]); \ 1486 p->member = cpu_to_le##bits(val); \ 1487 } 1488 1489 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1490 static inline u##bits btrfs_##name(type *s) \ 1491 { \ 1492 return le##bits##_to_cpu(s->member); \ 1493 } \ 1494 static inline void btrfs_set_##name(type *s, u##bits val) \ 1495 { \ 1496 s->member = cpu_to_le##bits(val); \ 1497 } 1498 1499 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1500 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1501 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1502 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1503 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1504 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1505 start_offset, 64); 1506 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1507 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1508 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1509 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1510 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1511 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1512 1513 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1514 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1515 total_bytes, 64); 1516 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1517 bytes_used, 64); 1518 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1519 io_align, 32); 1520 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1521 io_width, 32); 1522 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1523 sector_size, 32); 1524 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1525 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1526 dev_group, 32); 1527 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1528 seek_speed, 8); 1529 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1530 bandwidth, 8); 1531 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1532 generation, 64); 1533 1534 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d) 1535 { 1536 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid); 1537 } 1538 1539 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d) 1540 { 1541 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid); 1542 } 1543 1544 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1545 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1546 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1547 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1548 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1549 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1550 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1551 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1552 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1553 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1554 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1555 1556 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1557 { 1558 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1559 } 1560 1561 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1562 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1563 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1564 stripe_len, 64); 1565 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1566 io_align, 32); 1567 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1568 io_width, 32); 1569 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1570 sector_size, 32); 1571 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1572 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1573 num_stripes, 16); 1574 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1575 sub_stripes, 16); 1576 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1577 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1578 1579 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1580 int nr) 1581 { 1582 unsigned long offset = (unsigned long)c; 1583 offset += offsetof(struct btrfs_chunk, stripe); 1584 offset += nr * sizeof(struct btrfs_stripe); 1585 return (struct btrfs_stripe *)offset; 1586 } 1587 1588 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1589 { 1590 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1591 } 1592 1593 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1594 struct btrfs_chunk *c, int nr) 1595 { 1596 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1597 } 1598 1599 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1600 struct btrfs_chunk *c, int nr) 1601 { 1602 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1603 } 1604 1605 /* struct btrfs_block_group_item */ 1606 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1607 used, 64); 1608 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1609 used, 64); 1610 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1611 struct btrfs_block_group_item, chunk_objectid, 64); 1612 1613 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1614 struct btrfs_block_group_item, chunk_objectid, 64); 1615 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1616 struct btrfs_block_group_item, flags, 64); 1617 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1618 struct btrfs_block_group_item, flags, 64); 1619 1620 /* struct btrfs_free_space_info */ 1621 BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info, 1622 extent_count, 32); 1623 BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32); 1624 1625 /* struct btrfs_inode_ref */ 1626 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1627 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1628 1629 /* struct btrfs_inode_extref */ 1630 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref, 1631 parent_objectid, 64); 1632 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref, 1633 name_len, 16); 1634 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64); 1635 1636 /* struct btrfs_inode_item */ 1637 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1638 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1639 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1640 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1641 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1642 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1643 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1644 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1645 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1646 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1647 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1648 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1649 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item, 1650 generation, 64); 1651 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item, 1652 sequence, 64); 1653 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item, 1654 transid, 64); 1655 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64); 1656 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item, 1657 nbytes, 64); 1658 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item, 1659 block_group, 64); 1660 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32); 1661 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32); 1662 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32); 1663 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32); 1664 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64); 1665 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64); 1666 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1667 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1668 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64); 1669 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32); 1670 1671 /* struct btrfs_dev_extent */ 1672 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1673 chunk_tree, 64); 1674 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1675 chunk_objectid, 64); 1676 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1677 chunk_offset, 64); 1678 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1679 1680 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1681 { 1682 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1683 return (unsigned long)dev + ptr; 1684 } 1685 1686 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1687 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1688 generation, 64); 1689 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1690 1691 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); 1692 1693 1694 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1695 1696 static inline void btrfs_tree_block_key(struct extent_buffer *eb, 1697 struct btrfs_tree_block_info *item, 1698 struct btrfs_disk_key *key) 1699 { 1700 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1701 } 1702 1703 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, 1704 struct btrfs_tree_block_info *item, 1705 struct btrfs_disk_key *key) 1706 { 1707 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1708 } 1709 1710 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1711 root, 64); 1712 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1713 objectid, 64); 1714 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1715 offset, 64); 1716 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1717 count, 32); 1718 1719 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1720 count, 32); 1721 1722 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1723 type, 8); 1724 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1725 offset, 64); 1726 1727 static inline u32 btrfs_extent_inline_ref_size(int type) 1728 { 1729 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1730 type == BTRFS_SHARED_BLOCK_REF_KEY) 1731 return sizeof(struct btrfs_extent_inline_ref); 1732 if (type == BTRFS_SHARED_DATA_REF_KEY) 1733 return sizeof(struct btrfs_shared_data_ref) + 1734 sizeof(struct btrfs_extent_inline_ref); 1735 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1736 return sizeof(struct btrfs_extent_data_ref) + 1737 offsetof(struct btrfs_extent_inline_ref, offset); 1738 BUG(); 1739 return 0; 1740 } 1741 1742 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); 1743 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, 1744 generation, 64); 1745 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); 1746 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32); 1747 1748 /* struct btrfs_node */ 1749 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1750 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1751 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 1752 blockptr, 64); 1753 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr, 1754 generation, 64); 1755 1756 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1757 { 1758 unsigned long ptr; 1759 ptr = offsetof(struct btrfs_node, ptrs) + 1760 sizeof(struct btrfs_key_ptr) * nr; 1761 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1762 } 1763 1764 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1765 int nr, u64 val) 1766 { 1767 unsigned long ptr; 1768 ptr = offsetof(struct btrfs_node, ptrs) + 1769 sizeof(struct btrfs_key_ptr) * nr; 1770 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1771 } 1772 1773 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1774 { 1775 unsigned long ptr; 1776 ptr = offsetof(struct btrfs_node, ptrs) + 1777 sizeof(struct btrfs_key_ptr) * nr; 1778 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1779 } 1780 1781 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1782 int nr, u64 val) 1783 { 1784 unsigned long ptr; 1785 ptr = offsetof(struct btrfs_node, ptrs) + 1786 sizeof(struct btrfs_key_ptr) * nr; 1787 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1788 } 1789 1790 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1791 { 1792 return offsetof(struct btrfs_node, ptrs) + 1793 sizeof(struct btrfs_key_ptr) * nr; 1794 } 1795 1796 void btrfs_node_key(struct extent_buffer *eb, 1797 struct btrfs_disk_key *disk_key, int nr); 1798 1799 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1800 struct btrfs_disk_key *disk_key, int nr) 1801 { 1802 unsigned long ptr; 1803 ptr = btrfs_node_key_ptr_offset(nr); 1804 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1805 struct btrfs_key_ptr, key, disk_key); 1806 } 1807 1808 /* struct btrfs_item */ 1809 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1810 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1811 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32); 1812 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32); 1813 1814 static inline unsigned long btrfs_item_nr_offset(int nr) 1815 { 1816 return offsetof(struct btrfs_leaf, items) + 1817 sizeof(struct btrfs_item) * nr; 1818 } 1819 1820 static inline struct btrfs_item *btrfs_item_nr(int nr) 1821 { 1822 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1823 } 1824 1825 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1826 struct btrfs_item *item) 1827 { 1828 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1829 } 1830 1831 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1832 { 1833 return btrfs_item_end(eb, btrfs_item_nr(nr)); 1834 } 1835 1836 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1837 { 1838 return btrfs_item_offset(eb, btrfs_item_nr(nr)); 1839 } 1840 1841 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1842 { 1843 return btrfs_item_size(eb, btrfs_item_nr(nr)); 1844 } 1845 1846 static inline void btrfs_item_key(struct extent_buffer *eb, 1847 struct btrfs_disk_key *disk_key, int nr) 1848 { 1849 struct btrfs_item *item = btrfs_item_nr(nr); 1850 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1851 } 1852 1853 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1854 struct btrfs_disk_key *disk_key, int nr) 1855 { 1856 struct btrfs_item *item = btrfs_item_nr(nr); 1857 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1858 } 1859 1860 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1861 1862 /* 1863 * struct btrfs_root_ref 1864 */ 1865 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1866 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1867 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1868 1869 /* struct btrfs_dir_item */ 1870 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1871 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1872 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1873 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1874 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8); 1875 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, 1876 data_len, 16); 1877 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, 1878 name_len, 16); 1879 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, 1880 transid, 64); 1881 1882 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1883 struct btrfs_dir_item *item, 1884 struct btrfs_disk_key *key) 1885 { 1886 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1887 } 1888 1889 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1890 struct btrfs_dir_item *item, 1891 struct btrfs_disk_key *key) 1892 { 1893 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1894 } 1895 1896 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 1897 num_entries, 64); 1898 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 1899 num_bitmaps, 64); 1900 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 1901 generation, 64); 1902 1903 static inline void btrfs_free_space_key(struct extent_buffer *eb, 1904 struct btrfs_free_space_header *h, 1905 struct btrfs_disk_key *key) 1906 { 1907 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1908 } 1909 1910 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 1911 struct btrfs_free_space_header *h, 1912 struct btrfs_disk_key *key) 1913 { 1914 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1915 } 1916 1917 /* struct btrfs_disk_key */ 1918 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1919 objectid, 64); 1920 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1921 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1922 1923 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1924 struct btrfs_disk_key *disk) 1925 { 1926 cpu->offset = le64_to_cpu(disk->offset); 1927 cpu->type = disk->type; 1928 cpu->objectid = le64_to_cpu(disk->objectid); 1929 } 1930 1931 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1932 struct btrfs_key *cpu) 1933 { 1934 disk->offset = cpu_to_le64(cpu->offset); 1935 disk->type = cpu->type; 1936 disk->objectid = cpu_to_le64(cpu->objectid); 1937 } 1938 1939 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1940 struct btrfs_key *key, int nr) 1941 { 1942 struct btrfs_disk_key disk_key; 1943 btrfs_node_key(eb, &disk_key, nr); 1944 btrfs_disk_key_to_cpu(key, &disk_key); 1945 } 1946 1947 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1948 struct btrfs_key *key, int nr) 1949 { 1950 struct btrfs_disk_key disk_key; 1951 btrfs_item_key(eb, &disk_key, nr); 1952 btrfs_disk_key_to_cpu(key, &disk_key); 1953 } 1954 1955 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1956 struct btrfs_dir_item *item, 1957 struct btrfs_key *key) 1958 { 1959 struct btrfs_disk_key disk_key; 1960 btrfs_dir_item_key(eb, item, &disk_key); 1961 btrfs_disk_key_to_cpu(key, &disk_key); 1962 } 1963 1964 1965 static inline u8 btrfs_key_type(struct btrfs_key *key) 1966 { 1967 return key->type; 1968 } 1969 1970 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1971 { 1972 key->type = val; 1973 } 1974 1975 /* struct btrfs_header */ 1976 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1977 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1978 generation, 64); 1979 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1980 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1981 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1982 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1983 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header, 1984 generation, 64); 1985 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64); 1986 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, 1987 nritems, 32); 1988 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64); 1989 1990 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1991 { 1992 return (btrfs_header_flags(eb) & flag) == flag; 1993 } 1994 1995 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1996 { 1997 u64 flags = btrfs_header_flags(eb); 1998 btrfs_set_header_flags(eb, flags | flag); 1999 return (flags & flag) == flag; 2000 } 2001 2002 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 2003 { 2004 u64 flags = btrfs_header_flags(eb); 2005 btrfs_set_header_flags(eb, flags & ~flag); 2006 return (flags & flag) == flag; 2007 } 2008 2009 static inline int btrfs_header_backref_rev(struct extent_buffer *eb) 2010 { 2011 u64 flags = btrfs_header_flags(eb); 2012 return flags >> BTRFS_BACKREF_REV_SHIFT; 2013 } 2014 2015 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 2016 int rev) 2017 { 2018 u64 flags = btrfs_header_flags(eb); 2019 flags &= ~BTRFS_BACKREF_REV_MASK; 2020 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 2021 btrfs_set_header_flags(eb, flags); 2022 } 2023 2024 static inline unsigned long btrfs_header_fsid(void) 2025 { 2026 return offsetof(struct btrfs_header, fsid); 2027 } 2028 2029 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 2030 { 2031 return offsetof(struct btrfs_header, chunk_tree_uuid); 2032 } 2033 2034 static inline int btrfs_is_leaf(struct extent_buffer *eb) 2035 { 2036 return btrfs_header_level(eb) == 0; 2037 } 2038 2039 /* struct btrfs_root_item */ 2040 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 2041 generation, 64); 2042 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 2043 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 2044 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 2045 2046 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 2047 generation, 64); 2048 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 2049 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 2050 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 2051 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 2052 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 2053 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 2054 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 2055 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 2056 last_snapshot, 64); 2057 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item, 2058 generation_v2, 64); 2059 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item, 2060 ctransid, 64); 2061 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, 2062 otransid, 64); 2063 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, 2064 stransid, 64); 2065 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, 2066 rtransid, 64); 2067 2068 static inline bool btrfs_root_readonly(struct btrfs_root *root) 2069 { 2070 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; 2071 } 2072 2073 static inline bool btrfs_root_dead(struct btrfs_root *root) 2074 { 2075 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0; 2076 } 2077 2078 /* struct btrfs_root_backup */ 2079 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, 2080 tree_root, 64); 2081 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, 2082 tree_root_gen, 64); 2083 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, 2084 tree_root_level, 8); 2085 2086 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, 2087 chunk_root, 64); 2088 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, 2089 chunk_root_gen, 64); 2090 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, 2091 chunk_root_level, 8); 2092 2093 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, 2094 extent_root, 64); 2095 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, 2096 extent_root_gen, 64); 2097 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, 2098 extent_root_level, 8); 2099 2100 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, 2101 fs_root, 64); 2102 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, 2103 fs_root_gen, 64); 2104 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, 2105 fs_root_level, 8); 2106 2107 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, 2108 dev_root, 64); 2109 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, 2110 dev_root_gen, 64); 2111 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, 2112 dev_root_level, 8); 2113 2114 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, 2115 csum_root, 64); 2116 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, 2117 csum_root_gen, 64); 2118 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, 2119 csum_root_level, 8); 2120 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, 2121 total_bytes, 64); 2122 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, 2123 bytes_used, 64); 2124 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, 2125 num_devices, 64); 2126 2127 /* struct btrfs_balance_item */ 2128 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); 2129 2130 static inline void btrfs_balance_data(struct extent_buffer *eb, 2131 struct btrfs_balance_item *bi, 2132 struct btrfs_disk_balance_args *ba) 2133 { 2134 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2135 } 2136 2137 static inline void btrfs_set_balance_data(struct extent_buffer *eb, 2138 struct btrfs_balance_item *bi, 2139 struct btrfs_disk_balance_args *ba) 2140 { 2141 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2142 } 2143 2144 static inline void btrfs_balance_meta(struct extent_buffer *eb, 2145 struct btrfs_balance_item *bi, 2146 struct btrfs_disk_balance_args *ba) 2147 { 2148 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2149 } 2150 2151 static inline void btrfs_set_balance_meta(struct extent_buffer *eb, 2152 struct btrfs_balance_item *bi, 2153 struct btrfs_disk_balance_args *ba) 2154 { 2155 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2156 } 2157 2158 static inline void btrfs_balance_sys(struct extent_buffer *eb, 2159 struct btrfs_balance_item *bi, 2160 struct btrfs_disk_balance_args *ba) 2161 { 2162 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2163 } 2164 2165 static inline void btrfs_set_balance_sys(struct extent_buffer *eb, 2166 struct btrfs_balance_item *bi, 2167 struct btrfs_disk_balance_args *ba) 2168 { 2169 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2170 } 2171 2172 static inline void 2173 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu, 2174 struct btrfs_disk_balance_args *disk) 2175 { 2176 memset(cpu, 0, sizeof(*cpu)); 2177 2178 cpu->profiles = le64_to_cpu(disk->profiles); 2179 cpu->usage = le64_to_cpu(disk->usage); 2180 cpu->devid = le64_to_cpu(disk->devid); 2181 cpu->pstart = le64_to_cpu(disk->pstart); 2182 cpu->pend = le64_to_cpu(disk->pend); 2183 cpu->vstart = le64_to_cpu(disk->vstart); 2184 cpu->vend = le64_to_cpu(disk->vend); 2185 cpu->target = le64_to_cpu(disk->target); 2186 cpu->flags = le64_to_cpu(disk->flags); 2187 cpu->limit = le64_to_cpu(disk->limit); 2188 } 2189 2190 static inline void 2191 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk, 2192 struct btrfs_balance_args *cpu) 2193 { 2194 memset(disk, 0, sizeof(*disk)); 2195 2196 disk->profiles = cpu_to_le64(cpu->profiles); 2197 disk->usage = cpu_to_le64(cpu->usage); 2198 disk->devid = cpu_to_le64(cpu->devid); 2199 disk->pstart = cpu_to_le64(cpu->pstart); 2200 disk->pend = cpu_to_le64(cpu->pend); 2201 disk->vstart = cpu_to_le64(cpu->vstart); 2202 disk->vend = cpu_to_le64(cpu->vend); 2203 disk->target = cpu_to_le64(cpu->target); 2204 disk->flags = cpu_to_le64(cpu->flags); 2205 disk->limit = cpu_to_le64(cpu->limit); 2206 } 2207 2208 /* struct btrfs_super_block */ 2209 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 2210 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 2211 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 2212 generation, 64); 2213 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 2214 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 2215 struct btrfs_super_block, sys_chunk_array_size, 32); 2216 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 2217 struct btrfs_super_block, chunk_root_generation, 64); 2218 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 2219 root_level, 8); 2220 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 2221 chunk_root, 64); 2222 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 2223 chunk_root_level, 8); 2224 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 2225 log_root, 64); 2226 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 2227 log_root_transid, 64); 2228 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 2229 log_root_level, 8); 2230 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 2231 total_bytes, 64); 2232 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 2233 bytes_used, 64); 2234 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 2235 sectorsize, 32); 2236 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 2237 nodesize, 32); 2238 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 2239 stripesize, 32); 2240 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 2241 root_dir_objectid, 64); 2242 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 2243 num_devices, 64); 2244 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 2245 compat_flags, 64); 2246 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 2247 compat_ro_flags, 64); 2248 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 2249 incompat_flags, 64); 2250 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 2251 csum_type, 16); 2252 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 2253 cache_generation, 64); 2254 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); 2255 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, 2256 uuid_tree_generation, 64); 2257 2258 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 2259 { 2260 u16 t = btrfs_super_csum_type(s); 2261 /* 2262 * csum type is validated at mount time 2263 */ 2264 return btrfs_csum_sizes[t]; 2265 } 2266 2267 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 2268 { 2269 return offsetof(struct btrfs_leaf, items); 2270 } 2271 2272 /* struct btrfs_file_extent_item */ 2273 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 2274 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, 2275 struct btrfs_file_extent_item, disk_bytenr, 64); 2276 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, 2277 struct btrfs_file_extent_item, offset, 64); 2278 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, 2279 struct btrfs_file_extent_item, generation, 64); 2280 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, 2281 struct btrfs_file_extent_item, num_bytes, 64); 2282 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes, 2283 struct btrfs_file_extent_item, disk_num_bytes, 64); 2284 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression, 2285 struct btrfs_file_extent_item, compression, 8); 2286 2287 static inline unsigned long 2288 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 2289 { 2290 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START; 2291 } 2292 2293 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2294 { 2295 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize; 2296 } 2297 2298 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2299 disk_bytenr, 64); 2300 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2301 generation, 64); 2302 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2303 disk_num_bytes, 64); 2304 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2305 offset, 64); 2306 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2307 num_bytes, 64); 2308 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2309 ram_bytes, 64); 2310 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2311 compression, 8); 2312 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2313 encryption, 8); 2314 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2315 other_encoding, 16); 2316 2317 /* 2318 * this returns the number of bytes used by the item on disk, minus the 2319 * size of any extent headers. If a file is compressed on disk, this is 2320 * the compressed size 2321 */ 2322 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 2323 struct btrfs_item *e) 2324 { 2325 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START; 2326 } 2327 2328 /* this returns the number of file bytes represented by the inline item. 2329 * If an item is compressed, this is the uncompressed size 2330 */ 2331 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 2332 int slot, 2333 struct btrfs_file_extent_item *fi) 2334 { 2335 struct btrfs_map_token token; 2336 2337 btrfs_init_map_token(&token); 2338 /* 2339 * return the space used on disk if this item isn't 2340 * compressed or encoded 2341 */ 2342 if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 && 2343 btrfs_token_file_extent_encryption(eb, fi, &token) == 0 && 2344 btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) { 2345 return btrfs_file_extent_inline_item_len(eb, 2346 btrfs_item_nr(slot)); 2347 } 2348 2349 /* otherwise use the ram bytes field */ 2350 return btrfs_token_file_extent_ram_bytes(eb, fi, &token); 2351 } 2352 2353 2354 /* btrfs_dev_stats_item */ 2355 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb, 2356 struct btrfs_dev_stats_item *ptr, 2357 int index) 2358 { 2359 u64 val; 2360 2361 read_extent_buffer(eb, &val, 2362 offsetof(struct btrfs_dev_stats_item, values) + 2363 ((unsigned long)ptr) + (index * sizeof(u64)), 2364 sizeof(val)); 2365 return val; 2366 } 2367 2368 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb, 2369 struct btrfs_dev_stats_item *ptr, 2370 int index, u64 val) 2371 { 2372 write_extent_buffer(eb, &val, 2373 offsetof(struct btrfs_dev_stats_item, values) + 2374 ((unsigned long)ptr) + (index * sizeof(u64)), 2375 sizeof(val)); 2376 } 2377 2378 /* btrfs_qgroup_status_item */ 2379 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item, 2380 generation, 64); 2381 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 2382 version, 64); 2383 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item, 2384 flags, 64); 2385 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item, 2386 rescan, 64); 2387 2388 /* btrfs_qgroup_info_item */ 2389 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item, 2390 generation, 64); 2391 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64); 2392 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item, 2393 rfer_cmpr, 64); 2394 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64); 2395 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item, 2396 excl_cmpr, 64); 2397 2398 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation, 2399 struct btrfs_qgroup_info_item, generation, 64); 2400 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item, 2401 rfer, 64); 2402 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr, 2403 struct btrfs_qgroup_info_item, rfer_cmpr, 64); 2404 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item, 2405 excl, 64); 2406 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr, 2407 struct btrfs_qgroup_info_item, excl_cmpr, 64); 2408 2409 /* btrfs_qgroup_limit_item */ 2410 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item, 2411 flags, 64); 2412 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item, 2413 max_rfer, 64); 2414 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item, 2415 max_excl, 64); 2416 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item, 2417 rsv_rfer, 64); 2418 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item, 2419 rsv_excl, 64); 2420 2421 /* btrfs_dev_replace_item */ 2422 BTRFS_SETGET_FUNCS(dev_replace_src_devid, 2423 struct btrfs_dev_replace_item, src_devid, 64); 2424 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode, 2425 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode, 2426 64); 2427 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item, 2428 replace_state, 64); 2429 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item, 2430 time_started, 64); 2431 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item, 2432 time_stopped, 64); 2433 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item, 2434 num_write_errors, 64); 2435 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors, 2436 struct btrfs_dev_replace_item, num_uncorrectable_read_errors, 2437 64); 2438 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item, 2439 cursor_left, 64); 2440 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item, 2441 cursor_right, 64); 2442 2443 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid, 2444 struct btrfs_dev_replace_item, src_devid, 64); 2445 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode, 2446 struct btrfs_dev_replace_item, 2447 cont_reading_from_srcdev_mode, 64); 2448 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state, 2449 struct btrfs_dev_replace_item, replace_state, 64); 2450 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started, 2451 struct btrfs_dev_replace_item, time_started, 64); 2452 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped, 2453 struct btrfs_dev_replace_item, time_stopped, 64); 2454 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors, 2455 struct btrfs_dev_replace_item, num_write_errors, 64); 2456 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors, 2457 struct btrfs_dev_replace_item, 2458 num_uncorrectable_read_errors, 64); 2459 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left, 2460 struct btrfs_dev_replace_item, cursor_left, 64); 2461 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 2462 struct btrfs_dev_replace_item, cursor_right, 64); 2463 2464 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb) 2465 { 2466 return sb->s_fs_info; 2467 } 2468 2469 /* helper function to cast into the data area of the leaf. */ 2470 #define btrfs_item_ptr(leaf, slot, type) \ 2471 ((type *)(btrfs_leaf_data(leaf) + \ 2472 btrfs_item_offset_nr(leaf, slot))) 2473 2474 #define btrfs_item_ptr_offset(leaf, slot) \ 2475 ((unsigned long)(btrfs_leaf_data(leaf) + \ 2476 btrfs_item_offset_nr(leaf, slot))) 2477 2478 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 2479 { 2480 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 2481 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 2482 } 2483 2484 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) 2485 { 2486 return mapping_gfp_constraint(mapping, ~__GFP_FS); 2487 } 2488 2489 /* extent-tree.c */ 2490 2491 u64 btrfs_csum_bytes_to_leaves(struct btrfs_root *root, u64 csum_bytes); 2492 2493 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root, 2494 unsigned num_items) 2495 { 2496 return root->nodesize * BTRFS_MAX_LEVEL * 2 * num_items; 2497 } 2498 2499 /* 2500 * Doing a truncate won't result in new nodes or leaves, just what we need for 2501 * COW. 2502 */ 2503 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root, 2504 unsigned num_items) 2505 { 2506 return root->nodesize * BTRFS_MAX_LEVEL * num_items; 2507 } 2508 2509 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, 2510 struct btrfs_root *root); 2511 int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans, 2512 struct btrfs_root *root); 2513 void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info, 2514 const u64 start); 2515 void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg); 2516 bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 2517 void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr); 2518 void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg); 2519 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2520 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 2521 struct btrfs_root *root, unsigned long count); 2522 int btrfs_async_run_delayed_refs(struct btrfs_root *root, 2523 unsigned long count, u64 transid, int wait); 2524 int btrfs_lookup_data_extent(struct btrfs_root *root, u64 start, u64 len); 2525 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 2526 struct btrfs_root *root, u64 bytenr, 2527 u64 offset, int metadata, u64 *refs, u64 *flags); 2528 int btrfs_pin_extent(struct btrfs_root *root, 2529 u64 bytenr, u64 num, int reserved); 2530 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, 2531 u64 bytenr, u64 num_bytes); 2532 int btrfs_exclude_logged_extents(struct btrfs_root *root, 2533 struct extent_buffer *eb); 2534 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 2535 struct btrfs_root *root, 2536 u64 objectid, u64 offset, u64 bytenr); 2537 struct btrfs_block_group_cache *btrfs_lookup_block_group( 2538 struct btrfs_fs_info *info, 2539 u64 bytenr); 2540 void btrfs_get_block_group(struct btrfs_block_group_cache *cache); 2541 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2542 int get_block_group_index(struct btrfs_block_group_cache *cache); 2543 struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans, 2544 struct btrfs_root *root, u64 parent, 2545 u64 root_objectid, 2546 struct btrfs_disk_key *key, int level, 2547 u64 hint, u64 empty_size); 2548 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2549 struct btrfs_root *root, 2550 struct extent_buffer *buf, 2551 u64 parent, int last_ref); 2552 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 2553 struct btrfs_root *root, 2554 u64 root_objectid, u64 owner, 2555 u64 offset, u64 ram_bytes, 2556 struct btrfs_key *ins); 2557 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 2558 struct btrfs_root *root, 2559 u64 root_objectid, u64 owner, u64 offset, 2560 struct btrfs_key *ins); 2561 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes, 2562 u64 min_alloc_size, u64 empty_size, u64 hint_byte, 2563 struct btrfs_key *ins, int is_data, int delalloc); 2564 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2565 struct extent_buffer *buf, int full_backref); 2566 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2567 struct extent_buffer *buf, int full_backref); 2568 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2569 struct btrfs_root *root, 2570 u64 bytenr, u64 num_bytes, u64 flags, 2571 int level, int is_data); 2572 int btrfs_free_extent(struct btrfs_trans_handle *trans, 2573 struct btrfs_root *root, 2574 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, 2575 u64 owner, u64 offset); 2576 2577 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len, 2578 int delalloc); 2579 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, 2580 u64 start, u64 len); 2581 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, 2582 struct btrfs_root *root); 2583 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 2584 struct btrfs_root *root); 2585 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2586 struct btrfs_root *root, 2587 u64 bytenr, u64 num_bytes, u64 parent, 2588 u64 root_objectid, u64 owner, u64 offset); 2589 2590 int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans, 2591 struct btrfs_root *root); 2592 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 2593 struct btrfs_root *root); 2594 int btrfs_setup_space_cache(struct btrfs_trans_handle *trans, 2595 struct btrfs_root *root); 2596 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 2597 int btrfs_free_block_groups(struct btrfs_fs_info *info); 2598 int btrfs_read_block_groups(struct btrfs_root *root); 2599 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); 2600 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 2601 struct btrfs_root *root, u64 bytes_used, 2602 u64 type, u64 chunk_objectid, u64 chunk_offset, 2603 u64 size); 2604 struct btrfs_trans_handle *btrfs_start_trans_remove_block_group( 2605 struct btrfs_fs_info *fs_info, 2606 const u64 chunk_offset); 2607 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 2608 struct btrfs_root *root, u64 group_start, 2609 struct extent_map *em); 2610 void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info); 2611 void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache); 2612 void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache); 2613 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, 2614 struct btrfs_root *root); 2615 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data); 2616 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2617 2618 enum btrfs_reserve_flush_enum { 2619 /* If we are in the transaction, we can't flush anything.*/ 2620 BTRFS_RESERVE_NO_FLUSH, 2621 /* 2622 * Flushing delalloc may cause deadlock somewhere, in this 2623 * case, use FLUSH LIMIT 2624 */ 2625 BTRFS_RESERVE_FLUSH_LIMIT, 2626 BTRFS_RESERVE_FLUSH_ALL, 2627 }; 2628 2629 enum btrfs_flush_state { 2630 FLUSH_DELAYED_ITEMS_NR = 1, 2631 FLUSH_DELAYED_ITEMS = 2, 2632 FLUSH_DELALLOC = 3, 2633 FLUSH_DELALLOC_WAIT = 4, 2634 ALLOC_CHUNK = 5, 2635 COMMIT_TRANS = 6, 2636 }; 2637 2638 int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len); 2639 int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes); 2640 void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len); 2641 void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start, 2642 u64 len); 2643 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, 2644 struct btrfs_root *root); 2645 void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans); 2646 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, 2647 struct inode *inode); 2648 void btrfs_orphan_release_metadata(struct inode *inode); 2649 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, 2650 struct btrfs_block_rsv *rsv, 2651 int nitems, 2652 u64 *qgroup_reserved, bool use_global_rsv); 2653 void btrfs_subvolume_release_metadata(struct btrfs_root *root, 2654 struct btrfs_block_rsv *rsv, 2655 u64 qgroup_reserved); 2656 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); 2657 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); 2658 int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len); 2659 void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len); 2660 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type); 2661 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, 2662 unsigned short type); 2663 void btrfs_free_block_rsv(struct btrfs_root *root, 2664 struct btrfs_block_rsv *rsv); 2665 void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv); 2666 int btrfs_block_rsv_add(struct btrfs_root *root, 2667 struct btrfs_block_rsv *block_rsv, u64 num_bytes, 2668 enum btrfs_reserve_flush_enum flush); 2669 int btrfs_block_rsv_check(struct btrfs_root *root, 2670 struct btrfs_block_rsv *block_rsv, int min_factor); 2671 int btrfs_block_rsv_refill(struct btrfs_root *root, 2672 struct btrfs_block_rsv *block_rsv, u64 min_reserved, 2673 enum btrfs_reserve_flush_enum flush); 2674 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, 2675 struct btrfs_block_rsv *dst_rsv, u64 num_bytes, 2676 int update_size); 2677 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, 2678 struct btrfs_block_rsv *dest, u64 num_bytes, 2679 int min_factor); 2680 void btrfs_block_rsv_release(struct btrfs_root *root, 2681 struct btrfs_block_rsv *block_rsv, 2682 u64 num_bytes); 2683 int btrfs_inc_block_group_ro(struct btrfs_root *root, 2684 struct btrfs_block_group_cache *cache); 2685 void btrfs_dec_block_group_ro(struct btrfs_root *root, 2686 struct btrfs_block_group_cache *cache); 2687 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 2688 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 2689 int btrfs_error_unpin_extent_range(struct btrfs_root *root, 2690 u64 start, u64 end); 2691 int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, 2692 u64 num_bytes, u64 *actual_bytes); 2693 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, 2694 struct btrfs_root *root, u64 type); 2695 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); 2696 2697 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 2698 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, 2699 struct btrfs_fs_info *fs_info); 2700 int __get_raid_index(u64 flags); 2701 int btrfs_start_write_no_snapshoting(struct btrfs_root *root); 2702 void btrfs_end_write_no_snapshoting(struct btrfs_root *root); 2703 void btrfs_wait_for_snapshot_creation(struct btrfs_root *root); 2704 void check_system_chunk(struct btrfs_trans_handle *trans, 2705 struct btrfs_root *root, 2706 const u64 type); 2707 u64 add_new_free_space(struct btrfs_block_group_cache *block_group, 2708 struct btrfs_fs_info *info, u64 start, u64 end); 2709 2710 /* ctree.c */ 2711 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, 2712 int level, int *slot); 2713 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); 2714 int btrfs_previous_item(struct btrfs_root *root, 2715 struct btrfs_path *path, u64 min_objectid, 2716 int type); 2717 int btrfs_previous_extent_item(struct btrfs_root *root, 2718 struct btrfs_path *path, u64 min_objectid); 2719 void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info, 2720 struct btrfs_path *path, 2721 struct btrfs_key *new_key); 2722 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2723 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 2724 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2725 struct btrfs_key *key, int lowest_level, 2726 u64 min_trans); 2727 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2728 struct btrfs_path *path, 2729 u64 min_trans); 2730 enum btrfs_compare_tree_result { 2731 BTRFS_COMPARE_TREE_NEW, 2732 BTRFS_COMPARE_TREE_DELETED, 2733 BTRFS_COMPARE_TREE_CHANGED, 2734 BTRFS_COMPARE_TREE_SAME, 2735 }; 2736 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root, 2737 struct btrfs_root *right_root, 2738 struct btrfs_path *left_path, 2739 struct btrfs_path *right_path, 2740 struct btrfs_key *key, 2741 enum btrfs_compare_tree_result result, 2742 void *ctx); 2743 int btrfs_compare_trees(struct btrfs_root *left_root, 2744 struct btrfs_root *right_root, 2745 btrfs_changed_cb_t cb, void *ctx); 2746 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2747 struct btrfs_root *root, struct extent_buffer *buf, 2748 struct extent_buffer *parent, int parent_slot, 2749 struct extent_buffer **cow_ret); 2750 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2751 struct btrfs_root *root, 2752 struct extent_buffer *buf, 2753 struct extent_buffer **cow_ret, u64 new_root_objectid); 2754 int btrfs_block_can_be_shared(struct btrfs_root *root, 2755 struct extent_buffer *buf); 2756 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path, 2757 u32 data_size); 2758 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path, 2759 u32 new_size, int from_end); 2760 int btrfs_split_item(struct btrfs_trans_handle *trans, 2761 struct btrfs_root *root, 2762 struct btrfs_path *path, 2763 struct btrfs_key *new_key, 2764 unsigned long split_offset); 2765 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 2766 struct btrfs_root *root, 2767 struct btrfs_path *path, 2768 struct btrfs_key *new_key); 2769 int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path, 2770 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key); 2771 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 2772 *root, struct btrfs_key *key, struct btrfs_path *p, int 2773 ins_len, int cow); 2774 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key, 2775 struct btrfs_path *p, u64 time_seq); 2776 int btrfs_search_slot_for_read(struct btrfs_root *root, 2777 struct btrfs_key *key, struct btrfs_path *p, 2778 int find_higher, int return_any); 2779 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2780 struct btrfs_root *root, struct extent_buffer *parent, 2781 int start_slot, u64 *last_ret, 2782 struct btrfs_key *progress); 2783 void btrfs_release_path(struct btrfs_path *p); 2784 struct btrfs_path *btrfs_alloc_path(void); 2785 void btrfs_free_path(struct btrfs_path *p); 2786 void btrfs_set_path_blocking(struct btrfs_path *p); 2787 void btrfs_clear_path_blocking(struct btrfs_path *p, 2788 struct extent_buffer *held, int held_rw); 2789 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 2790 2791 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2792 struct btrfs_path *path, int slot, int nr); 2793 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2794 struct btrfs_root *root, 2795 struct btrfs_path *path) 2796 { 2797 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2798 } 2799 2800 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 2801 struct btrfs_key *cpu_key, u32 *data_size, 2802 u32 total_data, u32 total_size, int nr); 2803 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 2804 *root, struct btrfs_key *key, void *data, u32 data_size); 2805 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2806 struct btrfs_root *root, 2807 struct btrfs_path *path, 2808 struct btrfs_key *cpu_key, u32 *data_size, int nr); 2809 2810 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2811 struct btrfs_root *root, 2812 struct btrfs_path *path, 2813 struct btrfs_key *key, 2814 u32 data_size) 2815 { 2816 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2817 } 2818 2819 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2820 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2821 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 2822 u64 time_seq); 2823 static inline int btrfs_next_old_item(struct btrfs_root *root, 2824 struct btrfs_path *p, u64 time_seq) 2825 { 2826 ++p->slots[0]; 2827 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) 2828 return btrfs_next_old_leaf(root, p, time_seq); 2829 return 0; 2830 } 2831 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p) 2832 { 2833 return btrfs_next_old_item(root, p, 0); 2834 } 2835 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 2836 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, 2837 struct btrfs_block_rsv *block_rsv, 2838 int update_ref, int for_reloc); 2839 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2840 struct btrfs_root *root, 2841 struct extent_buffer *node, 2842 struct extent_buffer *parent); 2843 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 2844 { 2845 /* 2846 * Get synced with close_ctree() 2847 */ 2848 smp_mb(); 2849 return fs_info->closing; 2850 } 2851 2852 /* 2853 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 2854 * anything except sleeping. This function is used to check the status of 2855 * the fs. 2856 */ 2857 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root) 2858 { 2859 return (root->fs_info->sb->s_flags & MS_RDONLY || 2860 btrfs_fs_closing(root->fs_info)); 2861 } 2862 2863 static inline void free_fs_info(struct btrfs_fs_info *fs_info) 2864 { 2865 kfree(fs_info->balance_ctl); 2866 kfree(fs_info->delayed_root); 2867 kfree(fs_info->extent_root); 2868 kfree(fs_info->tree_root); 2869 kfree(fs_info->chunk_root); 2870 kfree(fs_info->dev_root); 2871 kfree(fs_info->csum_root); 2872 kfree(fs_info->quota_root); 2873 kfree(fs_info->uuid_root); 2874 kfree(fs_info->free_space_root); 2875 kfree(fs_info->super_copy); 2876 kfree(fs_info->super_for_commit); 2877 security_free_mnt_opts(&fs_info->security_opts); 2878 kfree(fs_info); 2879 } 2880 2881 /* tree mod log functions from ctree.c */ 2882 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, 2883 struct seq_list *elem); 2884 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info, 2885 struct seq_list *elem); 2886 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); 2887 2888 /* root-item.c */ 2889 int btrfs_find_root_ref(struct btrfs_root *tree_root, 2890 struct btrfs_path *path, 2891 u64 root_id, u64 ref_id); 2892 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 2893 struct btrfs_root *tree_root, 2894 u64 root_id, u64 ref_id, u64 dirid, u64 sequence, 2895 const char *name, int name_len); 2896 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, 2897 struct btrfs_root *tree_root, 2898 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, 2899 const char *name, int name_len); 2900 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2901 struct btrfs_key *key); 2902 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 2903 *root, struct btrfs_key *key, struct btrfs_root_item 2904 *item); 2905 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans, 2906 struct btrfs_root *root, 2907 struct btrfs_key *key, 2908 struct btrfs_root_item *item); 2909 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key, 2910 struct btrfs_path *path, struct btrfs_root_item *root_item, 2911 struct btrfs_key *root_key); 2912 int btrfs_find_orphan_roots(struct btrfs_root *tree_root); 2913 void btrfs_set_root_node(struct btrfs_root_item *item, 2914 struct extent_buffer *node); 2915 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 2916 void btrfs_update_root_times(struct btrfs_trans_handle *trans, 2917 struct btrfs_root *root); 2918 2919 /* uuid-tree.c */ 2920 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, 2921 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 2922 u64 subid); 2923 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans, 2924 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 2925 u64 subid); 2926 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info, 2927 int (*check_func)(struct btrfs_fs_info *, u8 *, u8, 2928 u64)); 2929 2930 /* dir-item.c */ 2931 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 2932 const char *name, int name_len); 2933 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2934 struct btrfs_root *root, const char *name, 2935 int name_len, struct inode *dir, 2936 struct btrfs_key *location, u8 type, u64 index); 2937 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2938 struct btrfs_root *root, 2939 struct btrfs_path *path, u64 dir, 2940 const char *name, int name_len, 2941 int mod); 2942 struct btrfs_dir_item * 2943 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2944 struct btrfs_root *root, 2945 struct btrfs_path *path, u64 dir, 2946 u64 objectid, const char *name, int name_len, 2947 int mod); 2948 struct btrfs_dir_item * 2949 btrfs_search_dir_index_item(struct btrfs_root *root, 2950 struct btrfs_path *path, u64 dirid, 2951 const char *name, int name_len); 2952 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2953 struct btrfs_root *root, 2954 struct btrfs_path *path, 2955 struct btrfs_dir_item *di); 2956 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2957 struct btrfs_root *root, 2958 struct btrfs_path *path, u64 objectid, 2959 const char *name, u16 name_len, 2960 const void *data, u16 data_len); 2961 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2962 struct btrfs_root *root, 2963 struct btrfs_path *path, u64 dir, 2964 const char *name, u16 name_len, 2965 int mod); 2966 int verify_dir_item(struct btrfs_root *root, 2967 struct extent_buffer *leaf, 2968 struct btrfs_dir_item *dir_item); 2969 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2970 struct btrfs_path *path, 2971 const char *name, 2972 int name_len); 2973 2974 /* orphan.c */ 2975 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2976 struct btrfs_root *root, u64 offset); 2977 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2978 struct btrfs_root *root, u64 offset); 2979 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2980 2981 /* inode-item.c */ 2982 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2983 struct btrfs_root *root, 2984 const char *name, int name_len, 2985 u64 inode_objectid, u64 ref_objectid, u64 index); 2986 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2987 struct btrfs_root *root, 2988 const char *name, int name_len, 2989 u64 inode_objectid, u64 ref_objectid, u64 *index); 2990 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2991 struct btrfs_root *root, 2992 struct btrfs_path *path, u64 objectid); 2993 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2994 *root, struct btrfs_path *path, 2995 struct btrfs_key *location, int mod); 2996 2997 struct btrfs_inode_extref * 2998 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, 2999 struct btrfs_root *root, 3000 struct btrfs_path *path, 3001 const char *name, int name_len, 3002 u64 inode_objectid, u64 ref_objectid, int ins_len, 3003 int cow); 3004 3005 int btrfs_find_name_in_ext_backref(struct btrfs_path *path, 3006 u64 ref_objectid, const char *name, 3007 int name_len, 3008 struct btrfs_inode_extref **extref_ret); 3009 3010 /* file-item.c */ 3011 struct btrfs_dio_private; 3012 int btrfs_del_csums(struct btrfs_trans_handle *trans, 3013 struct btrfs_root *root, u64 bytenr, u64 len); 3014 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 3015 struct bio *bio, u32 *dst); 3016 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, 3017 struct bio *bio, u64 logical_offset); 3018 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 3019 struct btrfs_root *root, 3020 u64 objectid, u64 pos, 3021 u64 disk_offset, u64 disk_num_bytes, 3022 u64 num_bytes, u64 offset, u64 ram_bytes, 3023 u8 compression, u8 encryption, u16 other_encoding); 3024 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 3025 struct btrfs_root *root, 3026 struct btrfs_path *path, u64 objectid, 3027 u64 bytenr, int mod); 3028 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 3029 struct btrfs_root *root, 3030 struct btrfs_ordered_sum *sums); 3031 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 3032 struct bio *bio, u64 file_start, int contig); 3033 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 3034 struct list_head *list, int search_commit); 3035 void btrfs_extent_item_to_extent_map(struct inode *inode, 3036 const struct btrfs_path *path, 3037 struct btrfs_file_extent_item *fi, 3038 const bool new_inline, 3039 struct extent_map *em); 3040 3041 /* inode.c */ 3042 struct btrfs_delalloc_work { 3043 struct inode *inode; 3044 int delay_iput; 3045 struct completion completion; 3046 struct list_head list; 3047 struct btrfs_work work; 3048 }; 3049 3050 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, 3051 int delay_iput); 3052 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work); 3053 3054 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, 3055 size_t pg_offset, u64 start, u64 len, 3056 int create); 3057 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, 3058 u64 *orig_start, u64 *orig_block_len, 3059 u64 *ram_bytes); 3060 3061 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 3062 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 3063 #define ClearPageChecked ClearPageFsMisc 3064 #define SetPageChecked SetPageFsMisc 3065 #define PageChecked PageFsMisc 3066 #endif 3067 3068 /* This forces readahead on a given range of bytes in an inode */ 3069 static inline void btrfs_force_ra(struct address_space *mapping, 3070 struct file_ra_state *ra, struct file *file, 3071 pgoff_t offset, unsigned long req_size) 3072 { 3073 page_cache_sync_readahead(mapping, ra, file, offset, req_size); 3074 } 3075 3076 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 3077 int btrfs_set_inode_index(struct inode *dir, u64 *index); 3078 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 3079 struct btrfs_root *root, 3080 struct inode *dir, struct inode *inode, 3081 const char *name, int name_len); 3082 int btrfs_add_link(struct btrfs_trans_handle *trans, 3083 struct inode *parent_inode, struct inode *inode, 3084 const char *name, int name_len, int add_backref, u64 index); 3085 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, 3086 struct btrfs_root *root, 3087 struct inode *dir, u64 objectid, 3088 const char *name, int name_len); 3089 int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len, 3090 int front); 3091 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 3092 struct btrfs_root *root, 3093 struct inode *inode, u64 new_size, 3094 u32 min_type); 3095 3096 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput); 3097 int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput, 3098 int nr); 3099 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, 3100 struct extent_state **cached_state); 3101 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 3102 struct btrfs_root *new_root, 3103 struct btrfs_root *parent_root, 3104 u64 new_dirid); 3105 int btrfs_merge_bio_hook(struct page *page, unsigned long offset, 3106 size_t size, struct bio *bio, 3107 unsigned long bio_flags); 3108 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 3109 int btrfs_readpage(struct file *file, struct page *page); 3110 void btrfs_evict_inode(struct inode *inode); 3111 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 3112 struct inode *btrfs_alloc_inode(struct super_block *sb); 3113 void btrfs_destroy_inode(struct inode *inode); 3114 int btrfs_drop_inode(struct inode *inode); 3115 int btrfs_init_cachep(void); 3116 void btrfs_destroy_cachep(void); 3117 long btrfs_ioctl_trans_end(struct file *file); 3118 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 3119 struct btrfs_root *root, int *was_new); 3120 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 3121 size_t pg_offset, u64 start, u64 end, 3122 int create); 3123 int btrfs_update_inode(struct btrfs_trans_handle *trans, 3124 struct btrfs_root *root, 3125 struct inode *inode); 3126 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 3127 struct btrfs_root *root, struct inode *inode); 3128 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 3129 int btrfs_orphan_cleanup(struct btrfs_root *root); 3130 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, 3131 struct btrfs_root *root); 3132 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 3133 void btrfs_invalidate_inodes(struct btrfs_root *root); 3134 void btrfs_add_delayed_iput(struct inode *inode); 3135 void btrfs_run_delayed_iputs(struct btrfs_root *root); 3136 int btrfs_prealloc_file_range(struct inode *inode, int mode, 3137 u64 start, u64 num_bytes, u64 min_size, 3138 loff_t actual_len, u64 *alloc_hint); 3139 int btrfs_prealloc_file_range_trans(struct inode *inode, 3140 struct btrfs_trans_handle *trans, int mode, 3141 u64 start, u64 num_bytes, u64 min_size, 3142 loff_t actual_len, u64 *alloc_hint); 3143 int btrfs_inode_check_errors(struct inode *inode); 3144 extern const struct dentry_operations btrfs_dentry_operations; 3145 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3146 void btrfs_test_inode_set_ops(struct inode *inode); 3147 #endif 3148 3149 /* ioctl.c */ 3150 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3151 long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3152 int btrfs_ioctl_get_supported_features(void __user *arg); 3153 void btrfs_update_iflags(struct inode *inode); 3154 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); 3155 int btrfs_is_empty_uuid(u8 *uuid); 3156 int btrfs_defrag_file(struct inode *inode, struct file *file, 3157 struct btrfs_ioctl_defrag_range_args *range, 3158 u64 newer_than, unsigned long max_pages); 3159 void btrfs_get_block_group_info(struct list_head *groups_list, 3160 struct btrfs_ioctl_space_info *space); 3161 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3162 struct btrfs_ioctl_balance_args *bargs); 3163 ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen, 3164 struct file *dst_file, u64 dst_loff); 3165 3166 /* file.c */ 3167 int btrfs_auto_defrag_init(void); 3168 void btrfs_auto_defrag_exit(void); 3169 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, 3170 struct inode *inode); 3171 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); 3172 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info); 3173 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); 3174 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 3175 int skip_pinned); 3176 extern const struct file_operations btrfs_file_operations; 3177 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, 3178 struct btrfs_root *root, struct inode *inode, 3179 struct btrfs_path *path, u64 start, u64 end, 3180 u64 *drop_end, int drop_cache, 3181 int replace_extent, 3182 u32 extent_item_size, 3183 int *key_inserted); 3184 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 3185 struct btrfs_root *root, struct inode *inode, u64 start, 3186 u64 end, int drop_cache); 3187 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 3188 struct inode *inode, u64 start, u64 end); 3189 int btrfs_release_file(struct inode *inode, struct file *file); 3190 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, 3191 struct page **pages, size_t num_pages, 3192 loff_t pos, size_t write_bytes, 3193 struct extent_state **cached); 3194 int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end); 3195 ssize_t btrfs_copy_file_range(struct file *file_in, loff_t pos_in, 3196 struct file *file_out, loff_t pos_out, 3197 size_t len, unsigned int flags); 3198 int btrfs_clone_file_range(struct file *file_in, loff_t pos_in, 3199 struct file *file_out, loff_t pos_out, u64 len); 3200 3201 /* tree-defrag.c */ 3202 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 3203 struct btrfs_root *root); 3204 3205 /* sysfs.c */ 3206 int btrfs_init_sysfs(void); 3207 void btrfs_exit_sysfs(void); 3208 int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info); 3209 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info); 3210 3211 /* xattr.c */ 3212 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 3213 3214 /* super.c */ 3215 int btrfs_parse_options(struct btrfs_root *root, char *options, 3216 unsigned long new_flags); 3217 int btrfs_sync_fs(struct super_block *sb, int wait); 3218 3219 #ifdef CONFIG_PRINTK 3220 __printf(2, 3) 3221 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); 3222 #else 3223 static inline __printf(2, 3) 3224 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 3225 { 3226 } 3227 #endif 3228 3229 #define btrfs_emerg(fs_info, fmt, args...) \ 3230 btrfs_printk(fs_info, KERN_EMERG fmt, ##args) 3231 #define btrfs_alert(fs_info, fmt, args...) \ 3232 btrfs_printk(fs_info, KERN_ALERT fmt, ##args) 3233 #define btrfs_crit(fs_info, fmt, args...) \ 3234 btrfs_printk(fs_info, KERN_CRIT fmt, ##args) 3235 #define btrfs_err(fs_info, fmt, args...) \ 3236 btrfs_printk(fs_info, KERN_ERR fmt, ##args) 3237 #define btrfs_warn(fs_info, fmt, args...) \ 3238 btrfs_printk(fs_info, KERN_WARNING fmt, ##args) 3239 #define btrfs_notice(fs_info, fmt, args...) \ 3240 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) 3241 #define btrfs_info(fs_info, fmt, args...) \ 3242 btrfs_printk(fs_info, KERN_INFO fmt, ##args) 3243 3244 /* 3245 * Wrappers that use printk_in_rcu 3246 */ 3247 #define btrfs_emerg_in_rcu(fs_info, fmt, args...) \ 3248 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3249 #define btrfs_alert_in_rcu(fs_info, fmt, args...) \ 3250 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3251 #define btrfs_crit_in_rcu(fs_info, fmt, args...) \ 3252 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3253 #define btrfs_err_in_rcu(fs_info, fmt, args...) \ 3254 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args) 3255 #define btrfs_warn_in_rcu(fs_info, fmt, args...) \ 3256 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3257 #define btrfs_notice_in_rcu(fs_info, fmt, args...) \ 3258 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3259 #define btrfs_info_in_rcu(fs_info, fmt, args...) \ 3260 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args) 3261 3262 /* 3263 * Wrappers that use a ratelimited printk_in_rcu 3264 */ 3265 #define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \ 3266 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args) 3267 #define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \ 3268 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args) 3269 #define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \ 3270 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args) 3271 #define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \ 3272 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args) 3273 #define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \ 3274 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args) 3275 #define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \ 3276 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args) 3277 #define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \ 3278 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args) 3279 3280 /* 3281 * Wrappers that use a ratelimited printk 3282 */ 3283 #define btrfs_emerg_rl(fs_info, fmt, args...) \ 3284 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args) 3285 #define btrfs_alert_rl(fs_info, fmt, args...) \ 3286 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args) 3287 #define btrfs_crit_rl(fs_info, fmt, args...) \ 3288 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args) 3289 #define btrfs_err_rl(fs_info, fmt, args...) \ 3290 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args) 3291 #define btrfs_warn_rl(fs_info, fmt, args...) \ 3292 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args) 3293 #define btrfs_notice_rl(fs_info, fmt, args...) \ 3294 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args) 3295 #define btrfs_info_rl(fs_info, fmt, args...) \ 3296 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args) 3297 #ifdef DEBUG 3298 #define btrfs_debug(fs_info, fmt, args...) \ 3299 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) 3300 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3301 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3302 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3303 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args) 3304 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3305 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args) 3306 #else 3307 #define btrfs_debug(fs_info, fmt, args...) \ 3308 no_printk(KERN_DEBUG fmt, ##args) 3309 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \ 3310 no_printk(KERN_DEBUG fmt, ##args) 3311 #define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \ 3312 no_printk(KERN_DEBUG fmt, ##args) 3313 #define btrfs_debug_rl(fs_info, fmt, args...) \ 3314 no_printk(KERN_DEBUG fmt, ##args) 3315 #endif 3316 3317 #define btrfs_printk_in_rcu(fs_info, fmt, args...) \ 3318 do { \ 3319 rcu_read_lock(); \ 3320 btrfs_printk(fs_info, fmt, ##args); \ 3321 rcu_read_unlock(); \ 3322 } while (0) 3323 3324 #define btrfs_printk_ratelimited(fs_info, fmt, args...) \ 3325 do { \ 3326 static DEFINE_RATELIMIT_STATE(_rs, \ 3327 DEFAULT_RATELIMIT_INTERVAL, \ 3328 DEFAULT_RATELIMIT_BURST); \ 3329 if (__ratelimit(&_rs)) \ 3330 btrfs_printk(fs_info, fmt, ##args); \ 3331 } while (0) 3332 3333 #define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \ 3334 do { \ 3335 rcu_read_lock(); \ 3336 btrfs_printk_ratelimited(fs_info, fmt, ##args); \ 3337 rcu_read_unlock(); \ 3338 } while (0) 3339 3340 #ifdef CONFIG_BTRFS_ASSERT 3341 3342 __cold 3343 static inline void assfail(char *expr, char *file, int line) 3344 { 3345 pr_err("BTRFS: assertion failed: %s, file: %s, line: %d", 3346 expr, file, line); 3347 BUG(); 3348 } 3349 3350 #define ASSERT(expr) \ 3351 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 3352 #else 3353 #define ASSERT(expr) ((void)0) 3354 #endif 3355 3356 __printf(5, 6) 3357 __cold 3358 void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function, 3359 unsigned int line, int errno, const char *fmt, ...); 3360 3361 const char *btrfs_decode_error(int errno); 3362 3363 __cold 3364 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 3365 struct btrfs_root *root, const char *function, 3366 unsigned int line, int errno); 3367 3368 /* 3369 * Call btrfs_abort_transaction as early as possible when an error condition is 3370 * detected, that way the exact line number is reported. 3371 */ 3372 #define btrfs_abort_transaction(trans, root, errno) \ 3373 do { \ 3374 /* Report first abort since mount */ \ 3375 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \ 3376 &((root)->fs_info->fs_state))) { \ 3377 WARN(1, KERN_DEBUG \ 3378 "BTRFS: Transaction aborted (error %d)\n", \ 3379 (errno)); \ 3380 } \ 3381 __btrfs_abort_transaction((trans), (root), __func__, \ 3382 __LINE__, (errno)); \ 3383 } while (0) 3384 3385 #define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \ 3386 do { \ 3387 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \ 3388 (errno), fmt, ##args); \ 3389 } while (0) 3390 3391 __printf(5, 6) 3392 __cold 3393 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3394 unsigned int line, int errno, const char *fmt, ...); 3395 /* 3396 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic 3397 * will panic(). Otherwise we BUG() here. 3398 */ 3399 #define btrfs_panic(fs_info, errno, fmt, args...) \ 3400 do { \ 3401 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \ 3402 BUG(); \ 3403 } while (0) 3404 3405 3406 /* compatibility and incompatibility defines */ 3407 3408 #define btrfs_set_fs_incompat(__fs_info, opt) \ 3409 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3410 3411 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, 3412 u64 flag) 3413 { 3414 struct btrfs_super_block *disk_super; 3415 u64 features; 3416 3417 disk_super = fs_info->super_copy; 3418 features = btrfs_super_incompat_flags(disk_super); 3419 if (!(features & flag)) { 3420 spin_lock(&fs_info->super_lock); 3421 features = btrfs_super_incompat_flags(disk_super); 3422 if (!(features & flag)) { 3423 features |= flag; 3424 btrfs_set_super_incompat_flags(disk_super, features); 3425 btrfs_info(fs_info, "setting %llu feature flag", 3426 flag); 3427 } 3428 spin_unlock(&fs_info->super_lock); 3429 } 3430 } 3431 3432 #define btrfs_clear_fs_incompat(__fs_info, opt) \ 3433 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3434 3435 static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, 3436 u64 flag) 3437 { 3438 struct btrfs_super_block *disk_super; 3439 u64 features; 3440 3441 disk_super = fs_info->super_copy; 3442 features = btrfs_super_incompat_flags(disk_super); 3443 if (features & flag) { 3444 spin_lock(&fs_info->super_lock); 3445 features = btrfs_super_incompat_flags(disk_super); 3446 if (features & flag) { 3447 features &= ~flag; 3448 btrfs_set_super_incompat_flags(disk_super, features); 3449 btrfs_info(fs_info, "clearing %llu feature flag", 3450 flag); 3451 } 3452 spin_unlock(&fs_info->super_lock); 3453 } 3454 } 3455 3456 #define btrfs_fs_incompat(fs_info, opt) \ 3457 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3458 3459 static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag) 3460 { 3461 struct btrfs_super_block *disk_super; 3462 disk_super = fs_info->super_copy; 3463 return !!(btrfs_super_incompat_flags(disk_super) & flag); 3464 } 3465 3466 #define btrfs_set_fs_compat_ro(__fs_info, opt) \ 3467 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3468 3469 static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, 3470 u64 flag) 3471 { 3472 struct btrfs_super_block *disk_super; 3473 u64 features; 3474 3475 disk_super = fs_info->super_copy; 3476 features = btrfs_super_compat_ro_flags(disk_super); 3477 if (!(features & flag)) { 3478 spin_lock(&fs_info->super_lock); 3479 features = btrfs_super_compat_ro_flags(disk_super); 3480 if (!(features & flag)) { 3481 features |= flag; 3482 btrfs_set_super_compat_ro_flags(disk_super, features); 3483 btrfs_info(fs_info, "setting %llu ro feature flag", 3484 flag); 3485 } 3486 spin_unlock(&fs_info->super_lock); 3487 } 3488 } 3489 3490 #define btrfs_clear_fs_compat_ro(__fs_info, opt) \ 3491 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3492 3493 static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, 3494 u64 flag) 3495 { 3496 struct btrfs_super_block *disk_super; 3497 u64 features; 3498 3499 disk_super = fs_info->super_copy; 3500 features = btrfs_super_compat_ro_flags(disk_super); 3501 if (features & flag) { 3502 spin_lock(&fs_info->super_lock); 3503 features = btrfs_super_compat_ro_flags(disk_super); 3504 if (features & flag) { 3505 features &= ~flag; 3506 btrfs_set_super_compat_ro_flags(disk_super, features); 3507 btrfs_info(fs_info, "clearing %llu ro feature flag", 3508 flag); 3509 } 3510 spin_unlock(&fs_info->super_lock); 3511 } 3512 } 3513 3514 #define btrfs_fs_compat_ro(fs_info, opt) \ 3515 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt) 3516 3517 static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag) 3518 { 3519 struct btrfs_super_block *disk_super; 3520 disk_super = fs_info->super_copy; 3521 return !!(btrfs_super_compat_ro_flags(disk_super) & flag); 3522 } 3523 3524 /* acl.c */ 3525 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 3526 struct posix_acl *btrfs_get_acl(struct inode *inode, int type); 3527 int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type); 3528 int btrfs_init_acl(struct btrfs_trans_handle *trans, 3529 struct inode *inode, struct inode *dir); 3530 #else 3531 #define btrfs_get_acl NULL 3532 #define btrfs_set_acl NULL 3533 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, 3534 struct inode *inode, struct inode *dir) 3535 { 3536 return 0; 3537 } 3538 #endif 3539 3540 /* relocation.c */ 3541 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 3542 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 3543 struct btrfs_root *root); 3544 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 3545 struct btrfs_root *root); 3546 int btrfs_recover_relocation(struct btrfs_root *root); 3547 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 3548 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 3549 struct btrfs_root *root, struct extent_buffer *buf, 3550 struct extent_buffer *cow); 3551 void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending, 3552 u64 *bytes_to_reserve); 3553 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 3554 struct btrfs_pending_snapshot *pending); 3555 3556 /* scrub.c */ 3557 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, 3558 u64 end, struct btrfs_scrub_progress *progress, 3559 int readonly, int is_dev_replace); 3560 void btrfs_scrub_pause(struct btrfs_root *root); 3561 void btrfs_scrub_continue(struct btrfs_root *root); 3562 int btrfs_scrub_cancel(struct btrfs_fs_info *info); 3563 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info, 3564 struct btrfs_device *dev); 3565 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, 3566 struct btrfs_scrub_progress *progress); 3567 3568 /* dev-replace.c */ 3569 void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info); 3570 void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info); 3571 void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount); 3572 3573 static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info) 3574 { 3575 btrfs_bio_counter_sub(fs_info, 1); 3576 } 3577 3578 /* reada.c */ 3579 struct reada_control { 3580 struct btrfs_root *root; /* tree to prefetch */ 3581 struct btrfs_key key_start; 3582 struct btrfs_key key_end; /* exclusive */ 3583 atomic_t elems; 3584 struct kref refcnt; 3585 wait_queue_head_t wait; 3586 }; 3587 struct reada_control *btrfs_reada_add(struct btrfs_root *root, 3588 struct btrfs_key *start, struct btrfs_key *end); 3589 int btrfs_reada_wait(void *handle); 3590 void btrfs_reada_detach(void *handle); 3591 int btree_readahead_hook(struct btrfs_fs_info *fs_info, 3592 struct extent_buffer *eb, u64 start, int err); 3593 3594 static inline int is_fstree(u64 rootid) 3595 { 3596 if (rootid == BTRFS_FS_TREE_OBJECTID || 3597 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID && 3598 !btrfs_qgroup_level(rootid))) 3599 return 1; 3600 return 0; 3601 } 3602 3603 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) 3604 { 3605 return signal_pending(current); 3606 } 3607 3608 /* Sanity test specific functions */ 3609 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3610 void btrfs_test_destroy_inode(struct inode *inode); 3611 #endif 3612 3613 static inline int btrfs_test_is_dummy_root(struct btrfs_root *root) 3614 { 3615 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 3616 if (unlikely(test_bit(BTRFS_ROOT_DUMMY_ROOT, &root->state))) 3617 return 1; 3618 #endif 3619 return 0; 3620 } 3621 3622 #endif 3623