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/version.h> 23 #include <linux/mm.h> 24 #include <linux/highmem.h> 25 #include <linux/fs.h> 26 #include <linux/completion.h> 27 #include <linux/backing-dev.h> 28 #include <linux/wait.h> 29 #include <asm/kmap_types.h> 30 #include "extent_io.h" 31 #include "extent_map.h" 32 #include "async-thread.h" 33 34 struct btrfs_trans_handle; 35 struct btrfs_transaction; 36 extern struct kmem_cache *btrfs_trans_handle_cachep; 37 extern struct kmem_cache *btrfs_transaction_cachep; 38 extern struct kmem_cache *btrfs_bit_radix_cachep; 39 extern struct kmem_cache *btrfs_path_cachep; 40 struct btrfs_ordered_sum; 41 42 #define BTRFS_MAGIC "_BHRfS_M" 43 44 #define BTRFS_MAX_LEVEL 8 45 46 #define BTRFS_COMPAT_EXTENT_TREE_V0 47 48 /* 49 * files bigger than this get some pre-flushing when they are added 50 * to the ordered operations list. That way we limit the total 51 * work done by the commit 52 */ 53 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024) 54 55 /* holds pointers to all of the tree roots */ 56 #define BTRFS_ROOT_TREE_OBJECTID 1ULL 57 58 /* stores information about which extents are in use, and reference counts */ 59 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL 60 61 /* 62 * chunk tree stores translations from logical -> physical block numbering 63 * the super block points to the chunk tree 64 */ 65 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL 66 67 /* 68 * stores information about which areas of a given device are in use. 69 * one per device. The tree of tree roots points to the device tree 70 */ 71 #define BTRFS_DEV_TREE_OBJECTID 4ULL 72 73 /* one per subvolume, storing files and directories */ 74 #define BTRFS_FS_TREE_OBJECTID 5ULL 75 76 /* directory objectid inside the root tree */ 77 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL 78 79 /* holds checksums of all the data extents */ 80 #define BTRFS_CSUM_TREE_OBJECTID 7ULL 81 82 /* orhpan objectid for tracking unlinked/truncated files */ 83 #define BTRFS_ORPHAN_OBJECTID -5ULL 84 85 /* does write ahead logging to speed up fsyncs */ 86 #define BTRFS_TREE_LOG_OBJECTID -6ULL 87 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL 88 89 /* for space balancing */ 90 #define BTRFS_TREE_RELOC_OBJECTID -8ULL 91 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL 92 93 /* 94 * extent checksums all have this objectid 95 * this allows them to share the logging tree 96 * for fsyncs 97 */ 98 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL 99 100 /* dummy objectid represents multiple objectids */ 101 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL 102 103 /* 104 * All files have objectids in this range. 105 */ 106 #define BTRFS_FIRST_FREE_OBJECTID 256ULL 107 #define BTRFS_LAST_FREE_OBJECTID -256ULL 108 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL 109 110 111 /* 112 * the device items go into the chunk tree. The key is in the form 113 * [ 1 BTRFS_DEV_ITEM_KEY device_id ] 114 */ 115 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL 116 117 #define BTRFS_BTREE_INODE_OBJECTID 1 118 119 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 120 121 /* 122 * we can actually store much bigger names, but lets not confuse the rest 123 * of linux 124 */ 125 #define BTRFS_NAME_LEN 255 126 127 /* 32 bytes in various csum fields */ 128 #define BTRFS_CSUM_SIZE 32 129 130 /* csum types */ 131 #define BTRFS_CSUM_TYPE_CRC32 0 132 133 static int btrfs_csum_sizes[] = { 4, 0 }; 134 135 /* four bytes for CRC32 */ 136 #define BTRFS_EMPTY_DIR_SIZE 0 137 138 #define BTRFS_FT_UNKNOWN 0 139 #define BTRFS_FT_REG_FILE 1 140 #define BTRFS_FT_DIR 2 141 #define BTRFS_FT_CHRDEV 3 142 #define BTRFS_FT_BLKDEV 4 143 #define BTRFS_FT_FIFO 5 144 #define BTRFS_FT_SOCK 6 145 #define BTRFS_FT_SYMLINK 7 146 #define BTRFS_FT_XATTR 8 147 #define BTRFS_FT_MAX 9 148 149 /* 150 * The key defines the order in the tree, and so it also defines (optimal) 151 * block layout. 152 * 153 * objectid corresponds to the inode number. 154 * 155 * type tells us things about the object, and is a kind of stream selector. 156 * so for a given inode, keys with type of 1 might refer to the inode data, 157 * type of 2 may point to file data in the btree and type == 3 may point to 158 * extents. 159 * 160 * offset is the starting byte offset for this key in the stream. 161 * 162 * btrfs_disk_key is in disk byte order. struct btrfs_key is always 163 * in cpu native order. Otherwise they are identical and their sizes 164 * should be the same (ie both packed) 165 */ 166 struct btrfs_disk_key { 167 __le64 objectid; 168 u8 type; 169 __le64 offset; 170 } __attribute__ ((__packed__)); 171 172 struct btrfs_key { 173 u64 objectid; 174 u8 type; 175 u64 offset; 176 } __attribute__ ((__packed__)); 177 178 struct btrfs_mapping_tree { 179 struct extent_map_tree map_tree; 180 }; 181 182 #define BTRFS_UUID_SIZE 16 183 struct btrfs_dev_item { 184 /* the internal btrfs device id */ 185 __le64 devid; 186 187 /* size of the device */ 188 __le64 total_bytes; 189 190 /* bytes used */ 191 __le64 bytes_used; 192 193 /* optimal io alignment for this device */ 194 __le32 io_align; 195 196 /* optimal io width for this device */ 197 __le32 io_width; 198 199 /* minimal io size for this device */ 200 __le32 sector_size; 201 202 /* type and info about this device */ 203 __le64 type; 204 205 /* expected generation for this device */ 206 __le64 generation; 207 208 /* 209 * starting byte of this partition on the device, 210 * to allow for stripe alignment in the future 211 */ 212 __le64 start_offset; 213 214 /* grouping information for allocation decisions */ 215 __le32 dev_group; 216 217 /* seek speed 0-100 where 100 is fastest */ 218 u8 seek_speed; 219 220 /* bandwidth 0-100 where 100 is fastest */ 221 u8 bandwidth; 222 223 /* btrfs generated uuid for this device */ 224 u8 uuid[BTRFS_UUID_SIZE]; 225 226 /* uuid of FS who owns this device */ 227 u8 fsid[BTRFS_UUID_SIZE]; 228 } __attribute__ ((__packed__)); 229 230 struct btrfs_stripe { 231 __le64 devid; 232 __le64 offset; 233 u8 dev_uuid[BTRFS_UUID_SIZE]; 234 } __attribute__ ((__packed__)); 235 236 struct btrfs_chunk { 237 /* size of this chunk in bytes */ 238 __le64 length; 239 240 /* objectid of the root referencing this chunk */ 241 __le64 owner; 242 243 __le64 stripe_len; 244 __le64 type; 245 246 /* optimal io alignment for this chunk */ 247 __le32 io_align; 248 249 /* optimal io width for this chunk */ 250 __le32 io_width; 251 252 /* minimal io size for this chunk */ 253 __le32 sector_size; 254 255 /* 2^16 stripes is quite a lot, a second limit is the size of a single 256 * item in the btree 257 */ 258 __le16 num_stripes; 259 260 /* sub stripes only matter for raid10 */ 261 __le16 sub_stripes; 262 struct btrfs_stripe stripe; 263 /* additional stripes go here */ 264 } __attribute__ ((__packed__)); 265 266 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 267 { 268 BUG_ON(num_stripes == 0); 269 return sizeof(struct btrfs_chunk) + 270 sizeof(struct btrfs_stripe) * (num_stripes - 1); 271 } 272 273 #define BTRFS_FSID_SIZE 16 274 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) 275 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) 276 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) 277 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) 278 279 #define BTRFS_BACKREF_REV_MAX 256 280 #define BTRFS_BACKREF_REV_SHIFT 56 281 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 282 BTRFS_BACKREF_REV_SHIFT) 283 284 #define BTRFS_OLD_BACKREF_REV 0 285 #define BTRFS_MIXED_BACKREF_REV 1 286 287 /* 288 * every tree block (leaf or node) starts with this header. 289 */ 290 struct btrfs_header { 291 /* these first four must match the super block */ 292 u8 csum[BTRFS_CSUM_SIZE]; 293 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 294 __le64 bytenr; /* which block this node is supposed to live in */ 295 __le64 flags; 296 297 /* allowed to be different from the super from here on down */ 298 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 299 __le64 generation; 300 __le64 owner; 301 __le32 nritems; 302 u8 level; 303 } __attribute__ ((__packed__)); 304 305 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ 306 sizeof(struct btrfs_header)) / \ 307 sizeof(struct btrfs_key_ptr)) 308 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) 309 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize)) 310 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 311 sizeof(struct btrfs_item) - \ 312 sizeof(struct btrfs_file_extent_item)) 313 314 315 /* 316 * this is a very generous portion of the super block, giving us 317 * room to translate 14 chunks with 3 stripes each. 318 */ 319 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 320 #define BTRFS_LABEL_SIZE 256 321 322 /* 323 * the super block basically lists the main trees of the FS 324 * it currently lacks any block count etc etc 325 */ 326 struct btrfs_super_block { 327 u8 csum[BTRFS_CSUM_SIZE]; 328 /* the first 4 fields must match struct btrfs_header */ 329 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 330 __le64 bytenr; /* this block number */ 331 __le64 flags; 332 333 /* allowed to be different from the btrfs_header from here own down */ 334 __le64 magic; 335 __le64 generation; 336 __le64 root; 337 __le64 chunk_root; 338 __le64 log_root; 339 340 /* this will help find the new super based on the log root */ 341 __le64 log_root_transid; 342 __le64 total_bytes; 343 __le64 bytes_used; 344 __le64 root_dir_objectid; 345 __le64 num_devices; 346 __le32 sectorsize; 347 __le32 nodesize; 348 __le32 leafsize; 349 __le32 stripesize; 350 __le32 sys_chunk_array_size; 351 __le64 chunk_root_generation; 352 __le64 compat_flags; 353 __le64 compat_ro_flags; 354 __le64 incompat_flags; 355 __le16 csum_type; 356 u8 root_level; 357 u8 chunk_root_level; 358 u8 log_root_level; 359 struct btrfs_dev_item dev_item; 360 361 char label[BTRFS_LABEL_SIZE]; 362 363 /* future expansion */ 364 __le64 reserved[32]; 365 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 366 } __attribute__ ((__packed__)); 367 368 /* 369 * Compat flags that we support. If any incompat flags are set other than the 370 * ones specified below then we will fail to mount 371 */ 372 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0) 373 374 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 375 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL 376 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 377 BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF 378 379 /* 380 * A leaf is full of items. offset and size tell us where to find 381 * the item in the leaf (relative to the start of the data area) 382 */ 383 struct btrfs_item { 384 struct btrfs_disk_key key; 385 __le32 offset; 386 __le32 size; 387 } __attribute__ ((__packed__)); 388 389 /* 390 * leaves have an item area and a data area: 391 * [item0, item1....itemN] [free space] [dataN...data1, data0] 392 * 393 * The data is separate from the items to get the keys closer together 394 * during searches. 395 */ 396 struct btrfs_leaf { 397 struct btrfs_header header; 398 struct btrfs_item items[]; 399 } __attribute__ ((__packed__)); 400 401 /* 402 * all non-leaf blocks are nodes, they hold only keys and pointers to 403 * other blocks 404 */ 405 struct btrfs_key_ptr { 406 struct btrfs_disk_key key; 407 __le64 blockptr; 408 __le64 generation; 409 } __attribute__ ((__packed__)); 410 411 struct btrfs_node { 412 struct btrfs_header header; 413 struct btrfs_key_ptr ptrs[]; 414 } __attribute__ ((__packed__)); 415 416 /* 417 * btrfs_paths remember the path taken from the root down to the leaf. 418 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 419 * to any other levels that are present. 420 * 421 * The slots array records the index of the item or block pointer 422 * used while walking the tree. 423 */ 424 struct btrfs_path { 425 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 426 int slots[BTRFS_MAX_LEVEL]; 427 /* if there is real range locking, this locks field will change */ 428 int locks[BTRFS_MAX_LEVEL]; 429 int reada; 430 /* keep some upper locks as we walk down */ 431 int lowest_level; 432 433 /* 434 * set by btrfs_split_item, tells search_slot to keep all locks 435 * and to force calls to keep space in the nodes 436 */ 437 unsigned int search_for_split:1; 438 unsigned int keep_locks:1; 439 unsigned int skip_locking:1; 440 unsigned int leave_spinning:1; 441 unsigned int search_commit_root:1; 442 }; 443 444 /* 445 * items in the extent btree are used to record the objectid of the 446 * owner of the block and the number of references 447 */ 448 449 struct btrfs_extent_item { 450 __le64 refs; 451 __le64 generation; 452 __le64 flags; 453 } __attribute__ ((__packed__)); 454 455 struct btrfs_extent_item_v0 { 456 __le32 refs; 457 } __attribute__ ((__packed__)); 458 459 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \ 460 sizeof(struct btrfs_item)) 461 462 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0) 463 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1) 464 465 /* following flags only apply to tree blocks */ 466 467 /* use full backrefs for extent pointers in the block */ 468 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8) 469 470 struct btrfs_tree_block_info { 471 struct btrfs_disk_key key; 472 u8 level; 473 } __attribute__ ((__packed__)); 474 475 struct btrfs_extent_data_ref { 476 __le64 root; 477 __le64 objectid; 478 __le64 offset; 479 __le32 count; 480 } __attribute__ ((__packed__)); 481 482 struct btrfs_shared_data_ref { 483 __le32 count; 484 } __attribute__ ((__packed__)); 485 486 struct btrfs_extent_inline_ref { 487 u8 type; 488 __le64 offset; 489 } __attribute__ ((__packed__)); 490 491 /* old style backrefs item */ 492 struct btrfs_extent_ref_v0 { 493 __le64 root; 494 __le64 generation; 495 __le64 objectid; 496 __le32 count; 497 } __attribute__ ((__packed__)); 498 499 500 /* dev extents record free space on individual devices. The owner 501 * field points back to the chunk allocation mapping tree that allocated 502 * the extent. The chunk tree uuid field is a way to double check the owner 503 */ 504 struct btrfs_dev_extent { 505 __le64 chunk_tree; 506 __le64 chunk_objectid; 507 __le64 chunk_offset; 508 __le64 length; 509 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 510 } __attribute__ ((__packed__)); 511 512 struct btrfs_inode_ref { 513 __le64 index; 514 __le16 name_len; 515 /* name goes here */ 516 } __attribute__ ((__packed__)); 517 518 struct btrfs_timespec { 519 __le64 sec; 520 __le32 nsec; 521 } __attribute__ ((__packed__)); 522 523 enum btrfs_compression_type { 524 BTRFS_COMPRESS_NONE = 0, 525 BTRFS_COMPRESS_ZLIB = 1, 526 BTRFS_COMPRESS_LAST = 2, 527 }; 528 529 struct btrfs_inode_item { 530 /* nfs style generation number */ 531 __le64 generation; 532 /* transid that last touched this inode */ 533 __le64 transid; 534 __le64 size; 535 __le64 nbytes; 536 __le64 block_group; 537 __le32 nlink; 538 __le32 uid; 539 __le32 gid; 540 __le32 mode; 541 __le64 rdev; 542 __le64 flags; 543 544 /* modification sequence number for NFS */ 545 __le64 sequence; 546 547 /* 548 * a little future expansion, for more than this we can 549 * just grow the inode item and version it 550 */ 551 __le64 reserved[4]; 552 struct btrfs_timespec atime; 553 struct btrfs_timespec ctime; 554 struct btrfs_timespec mtime; 555 struct btrfs_timespec otime; 556 } __attribute__ ((__packed__)); 557 558 struct btrfs_dir_log_item { 559 __le64 end; 560 } __attribute__ ((__packed__)); 561 562 struct btrfs_dir_item { 563 struct btrfs_disk_key location; 564 __le64 transid; 565 __le16 data_len; 566 __le16 name_len; 567 u8 type; 568 } __attribute__ ((__packed__)); 569 570 struct btrfs_root_item { 571 struct btrfs_inode_item inode; 572 __le64 generation; 573 __le64 root_dirid; 574 __le64 bytenr; 575 __le64 byte_limit; 576 __le64 bytes_used; 577 __le64 last_snapshot; 578 __le64 flags; 579 __le32 refs; 580 struct btrfs_disk_key drop_progress; 581 u8 drop_level; 582 u8 level; 583 } __attribute__ ((__packed__)); 584 585 /* 586 * this is used for both forward and backward root refs 587 */ 588 struct btrfs_root_ref { 589 __le64 dirid; 590 __le64 sequence; 591 __le16 name_len; 592 } __attribute__ ((__packed__)); 593 594 #define BTRFS_FILE_EXTENT_INLINE 0 595 #define BTRFS_FILE_EXTENT_REG 1 596 #define BTRFS_FILE_EXTENT_PREALLOC 2 597 598 struct btrfs_file_extent_item { 599 /* 600 * transaction id that created this extent 601 */ 602 __le64 generation; 603 /* 604 * max number of bytes to hold this extent in ram 605 * when we split a compressed extent we can't know how big 606 * each of the resulting pieces will be. So, this is 607 * an upper limit on the size of the extent in ram instead of 608 * an exact limit. 609 */ 610 __le64 ram_bytes; 611 612 /* 613 * 32 bits for the various ways we might encode the data, 614 * including compression and encryption. If any of these 615 * are set to something a given disk format doesn't understand 616 * it is treated like an incompat flag for reading and writing, 617 * but not for stat. 618 */ 619 u8 compression; 620 u8 encryption; 621 __le16 other_encoding; /* spare for later use */ 622 623 /* are we inline data or a real extent? */ 624 u8 type; 625 626 /* 627 * disk space consumed by the extent, checksum blocks are included 628 * in these numbers 629 */ 630 __le64 disk_bytenr; 631 __le64 disk_num_bytes; 632 /* 633 * the logical offset in file blocks (no csums) 634 * this extent record is for. This allows a file extent to point 635 * into the middle of an existing extent on disk, sharing it 636 * between two snapshots (useful if some bytes in the middle of the 637 * extent have changed 638 */ 639 __le64 offset; 640 /* 641 * the logical number of file blocks (no csums included). This 642 * always reflects the size uncompressed and without encoding. 643 */ 644 __le64 num_bytes; 645 646 } __attribute__ ((__packed__)); 647 648 struct btrfs_csum_item { 649 u8 csum; 650 } __attribute__ ((__packed__)); 651 652 /* different types of block groups (and chunks) */ 653 #define BTRFS_BLOCK_GROUP_DATA (1 << 0) 654 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1) 655 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2) 656 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3) 657 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4) 658 #define BTRFS_BLOCK_GROUP_DUP (1 << 5) 659 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6) 660 661 struct btrfs_block_group_item { 662 __le64 used; 663 __le64 chunk_objectid; 664 __le64 flags; 665 } __attribute__ ((__packed__)); 666 667 struct btrfs_space_info { 668 u64 flags; 669 670 u64 total_bytes; /* total bytes in the space */ 671 u64 bytes_used; /* total bytes used on disk */ 672 u64 bytes_pinned; /* total bytes pinned, will be freed when the 673 transaction finishes */ 674 u64 bytes_reserved; /* total bytes the allocator has reserved for 675 current allocations */ 676 u64 bytes_readonly; /* total bytes that are read only */ 677 u64 bytes_super; /* total bytes reserved for the super blocks */ 678 u64 bytes_root; /* the number of bytes needed to commit a 679 transaction */ 680 u64 bytes_may_use; /* number of bytes that may be used for 681 delalloc/allocations */ 682 u64 bytes_delalloc; /* number of bytes currently reserved for 683 delayed allocation */ 684 685 int full; /* indicates that we cannot allocate any more 686 chunks for this space */ 687 int force_alloc; /* set if we need to force a chunk alloc for 688 this space */ 689 int force_delalloc; /* make people start doing filemap_flush until 690 we're under a threshold */ 691 692 struct list_head list; 693 694 /* for controlling how we free up space for allocations */ 695 wait_queue_head_t allocate_wait; 696 wait_queue_head_t flush_wait; 697 int allocating_chunk; 698 int flushing; 699 700 /* for block groups in our same type */ 701 struct list_head block_groups; 702 spinlock_t lock; 703 struct rw_semaphore groups_sem; 704 atomic_t caching_threads; 705 }; 706 707 /* 708 * free clusters are used to claim free space in relatively large chunks, 709 * allowing us to do less seeky writes. They are used for all metadata 710 * allocations and data allocations in ssd mode. 711 */ 712 struct btrfs_free_cluster { 713 spinlock_t lock; 714 spinlock_t refill_lock; 715 struct rb_root root; 716 717 /* largest extent in this cluster */ 718 u64 max_size; 719 720 /* first extent starting offset */ 721 u64 window_start; 722 723 /* if this cluster simply points at a bitmap in the block group */ 724 bool points_to_bitmap; 725 726 struct btrfs_block_group_cache *block_group; 727 /* 728 * when a cluster is allocated from a block group, we put the 729 * cluster onto a list in the block group so that it can 730 * be freed before the block group is freed. 731 */ 732 struct list_head block_group_list; 733 }; 734 735 enum btrfs_caching_type { 736 BTRFS_CACHE_NO = 0, 737 BTRFS_CACHE_STARTED = 1, 738 BTRFS_CACHE_FINISHED = 2, 739 }; 740 741 struct btrfs_caching_control { 742 struct list_head list; 743 struct mutex mutex; 744 wait_queue_head_t wait; 745 struct btrfs_block_group_cache *block_group; 746 u64 progress; 747 atomic_t count; 748 }; 749 750 struct btrfs_block_group_cache { 751 struct btrfs_key key; 752 struct btrfs_block_group_item item; 753 struct btrfs_fs_info *fs_info; 754 spinlock_t lock; 755 u64 pinned; 756 u64 reserved; 757 u64 bytes_super; 758 u64 flags; 759 u64 sectorsize; 760 int extents_thresh; 761 int free_extents; 762 int total_bitmaps; 763 int ro; 764 int dirty; 765 766 /* cache tracking stuff */ 767 int cached; 768 struct btrfs_caching_control *caching_ctl; 769 u64 last_byte_to_unpin; 770 771 struct btrfs_space_info *space_info; 772 773 /* free space cache stuff */ 774 spinlock_t tree_lock; 775 struct rb_root free_space_offset; 776 u64 free_space; 777 778 /* block group cache stuff */ 779 struct rb_node cache_node; 780 781 /* for block groups in the same raid type */ 782 struct list_head list; 783 784 /* usage count */ 785 atomic_t count; 786 787 /* List of struct btrfs_free_clusters for this block group. 788 * Today it will only have one thing on it, but that may change 789 */ 790 struct list_head cluster_list; 791 }; 792 793 struct reloc_control; 794 struct btrfs_device; 795 struct btrfs_fs_devices; 796 struct btrfs_fs_info { 797 u8 fsid[BTRFS_FSID_SIZE]; 798 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 799 struct btrfs_root *extent_root; 800 struct btrfs_root *tree_root; 801 struct btrfs_root *chunk_root; 802 struct btrfs_root *dev_root; 803 struct btrfs_root *fs_root; 804 struct btrfs_root *csum_root; 805 806 /* the log root tree is a directory of all the other log roots */ 807 struct btrfs_root *log_root_tree; 808 809 spinlock_t fs_roots_radix_lock; 810 struct radix_tree_root fs_roots_radix; 811 812 /* block group cache stuff */ 813 spinlock_t block_group_cache_lock; 814 struct rb_root block_group_cache_tree; 815 816 struct extent_io_tree freed_extents[2]; 817 struct extent_io_tree *pinned_extents; 818 819 /* logical->physical extent mapping */ 820 struct btrfs_mapping_tree mapping_tree; 821 822 u64 generation; 823 u64 last_trans_committed; 824 825 /* 826 * this is updated to the current trans every time a full commit 827 * is required instead of the faster short fsync log commits 828 */ 829 u64 last_trans_log_full_commit; 830 u64 open_ioctl_trans; 831 unsigned long mount_opt; 832 u64 max_extent; 833 u64 max_inline; 834 u64 alloc_start; 835 struct btrfs_transaction *running_transaction; 836 wait_queue_head_t transaction_throttle; 837 wait_queue_head_t transaction_wait; 838 wait_queue_head_t async_submit_wait; 839 840 struct btrfs_super_block super_copy; 841 struct btrfs_super_block super_for_commit; 842 struct block_device *__bdev; 843 struct super_block *sb; 844 struct inode *btree_inode; 845 struct backing_dev_info bdi; 846 struct mutex trans_mutex; 847 struct mutex tree_log_mutex; 848 struct mutex transaction_kthread_mutex; 849 struct mutex cleaner_mutex; 850 struct mutex chunk_mutex; 851 struct mutex volume_mutex; 852 /* 853 * this protects the ordered operations list only while we are 854 * processing all of the entries on it. This way we make 855 * sure the commit code doesn't find the list temporarily empty 856 * because another function happens to be doing non-waiting preflush 857 * before jumping into the main commit. 858 */ 859 struct mutex ordered_operations_mutex; 860 struct rw_semaphore extent_commit_sem; 861 862 struct rw_semaphore subvol_sem; 863 864 struct srcu_struct subvol_srcu; 865 866 struct list_head trans_list; 867 struct list_head hashers; 868 struct list_head dead_roots; 869 struct list_head caching_block_groups; 870 871 atomic_t nr_async_submits; 872 atomic_t async_submit_draining; 873 atomic_t nr_async_bios; 874 atomic_t async_delalloc_pages; 875 876 /* 877 * this is used by the balancing code to wait for all the pending 878 * ordered extents 879 */ 880 spinlock_t ordered_extent_lock; 881 882 /* 883 * all of the data=ordered extents pending writeback 884 * these can span multiple transactions and basically include 885 * every dirty data page that isn't from nodatacow 886 */ 887 struct list_head ordered_extents; 888 889 /* 890 * all of the inodes that have delalloc bytes. It is possible for 891 * this list to be empty even when there is still dirty data=ordered 892 * extents waiting to finish IO. 893 */ 894 struct list_head delalloc_inodes; 895 896 /* 897 * special rename and truncate targets that must be on disk before 898 * we're allowed to commit. This is basically the ext3 style 899 * data=ordered list. 900 */ 901 struct list_head ordered_operations; 902 903 /* 904 * there is a pool of worker threads for checksumming during writes 905 * and a pool for checksumming after reads. This is because readers 906 * can run with FS locks held, and the writers may be waiting for 907 * those locks. We don't want ordering in the pending list to cause 908 * deadlocks, and so the two are serviced separately. 909 * 910 * A third pool does submit_bio to avoid deadlocking with the other 911 * two 912 */ 913 struct btrfs_workers generic_worker; 914 struct btrfs_workers workers; 915 struct btrfs_workers delalloc_workers; 916 struct btrfs_workers endio_workers; 917 struct btrfs_workers endio_meta_workers; 918 struct btrfs_workers endio_meta_write_workers; 919 struct btrfs_workers endio_write_workers; 920 struct btrfs_workers submit_workers; 921 struct btrfs_workers enospc_workers; 922 /* 923 * fixup workers take dirty pages that didn't properly go through 924 * the cow mechanism and make them safe to write. It happens 925 * for the sys_munmap function call path 926 */ 927 struct btrfs_workers fixup_workers; 928 struct task_struct *transaction_kthread; 929 struct task_struct *cleaner_kthread; 930 int thread_pool_size; 931 932 struct kobject super_kobj; 933 struct completion kobj_unregister; 934 int do_barriers; 935 int closing; 936 int log_root_recovering; 937 938 u64 total_pinned; 939 940 /* protected by the delalloc lock, used to keep from writing 941 * metadata until there is a nice batch 942 */ 943 u64 dirty_metadata_bytes; 944 struct list_head dirty_cowonly_roots; 945 946 struct btrfs_fs_devices *fs_devices; 947 948 /* 949 * the space_info list is almost entirely read only. It only changes 950 * when we add a new raid type to the FS, and that happens 951 * very rarely. RCU is used to protect it. 952 */ 953 struct list_head space_info; 954 955 struct reloc_control *reloc_ctl; 956 957 spinlock_t delalloc_lock; 958 spinlock_t new_trans_lock; 959 u64 delalloc_bytes; 960 961 /* data_alloc_cluster is only used in ssd mode */ 962 struct btrfs_free_cluster data_alloc_cluster; 963 964 /* all metadata allocations go through this cluster */ 965 struct btrfs_free_cluster meta_alloc_cluster; 966 967 spinlock_t ref_cache_lock; 968 u64 total_ref_cache_size; 969 970 u64 avail_data_alloc_bits; 971 u64 avail_metadata_alloc_bits; 972 u64 avail_system_alloc_bits; 973 u64 data_alloc_profile; 974 u64 metadata_alloc_profile; 975 u64 system_alloc_profile; 976 977 unsigned data_chunk_allocations; 978 unsigned metadata_ratio; 979 980 void *bdev_holder; 981 }; 982 983 /* 984 * in ram representation of the tree. extent_root is used for all allocations 985 * and for the extent tree extent_root root. 986 */ 987 struct btrfs_root { 988 struct extent_buffer *node; 989 990 /* the node lock is held while changing the node pointer */ 991 spinlock_t node_lock; 992 993 struct extent_buffer *commit_root; 994 struct btrfs_root *log_root; 995 struct btrfs_root *reloc_root; 996 997 struct btrfs_root_item root_item; 998 struct btrfs_key root_key; 999 struct btrfs_fs_info *fs_info; 1000 struct extent_io_tree dirty_log_pages; 1001 1002 struct kobject root_kobj; 1003 struct completion kobj_unregister; 1004 struct mutex objectid_mutex; 1005 1006 struct mutex log_mutex; 1007 wait_queue_head_t log_writer_wait; 1008 wait_queue_head_t log_commit_wait[2]; 1009 atomic_t log_writers; 1010 atomic_t log_commit[2]; 1011 unsigned long log_transid; 1012 unsigned long last_log_commit; 1013 unsigned long log_batch; 1014 pid_t log_start_pid; 1015 bool log_multiple_pids; 1016 1017 u64 objectid; 1018 u64 last_trans; 1019 1020 /* data allocations are done in sectorsize units */ 1021 u32 sectorsize; 1022 1023 /* node allocations are done in nodesize units */ 1024 u32 nodesize; 1025 1026 /* leaf allocations are done in leafsize units */ 1027 u32 leafsize; 1028 1029 u32 stripesize; 1030 1031 u32 type; 1032 1033 u64 highest_objectid; 1034 int ref_cows; 1035 int track_dirty; 1036 int in_radix; 1037 1038 u64 defrag_trans_start; 1039 struct btrfs_key defrag_progress; 1040 struct btrfs_key defrag_max; 1041 int defrag_running; 1042 int defrag_level; 1043 char *name; 1044 int in_sysfs; 1045 1046 /* the dirty list is only used by non-reference counted roots */ 1047 struct list_head dirty_list; 1048 1049 struct list_head root_list; 1050 1051 spinlock_t list_lock; 1052 struct list_head orphan_list; 1053 1054 spinlock_t inode_lock; 1055 /* red-black tree that keeps track of in-memory inodes */ 1056 struct rb_root inode_tree; 1057 1058 /* 1059 * right now this just gets used so that a root has its own devid 1060 * for stat. It may be used for more later 1061 */ 1062 struct super_block anon_super; 1063 }; 1064 1065 /* 1066 * inode items have the data typically returned from stat and store other 1067 * info about object characteristics. There is one for every file and dir in 1068 * the FS 1069 */ 1070 #define BTRFS_INODE_ITEM_KEY 1 1071 #define BTRFS_INODE_REF_KEY 12 1072 #define BTRFS_XATTR_ITEM_KEY 24 1073 #define BTRFS_ORPHAN_ITEM_KEY 48 1074 /* reserve 2-15 close to the inode for later flexibility */ 1075 1076 /* 1077 * dir items are the name -> inode pointers in a directory. There is one 1078 * for every name in a directory. 1079 */ 1080 #define BTRFS_DIR_LOG_ITEM_KEY 60 1081 #define BTRFS_DIR_LOG_INDEX_KEY 72 1082 #define BTRFS_DIR_ITEM_KEY 84 1083 #define BTRFS_DIR_INDEX_KEY 96 1084 /* 1085 * extent data is for file data 1086 */ 1087 #define BTRFS_EXTENT_DATA_KEY 108 1088 1089 /* 1090 * extent csums are stored in a separate tree and hold csums for 1091 * an entire extent on disk. 1092 */ 1093 #define BTRFS_EXTENT_CSUM_KEY 128 1094 1095 /* 1096 * root items point to tree roots. They are typically in the root 1097 * tree used by the super block to find all the other trees 1098 */ 1099 #define BTRFS_ROOT_ITEM_KEY 132 1100 1101 /* 1102 * root backrefs tie subvols and snapshots to the directory entries that 1103 * reference them 1104 */ 1105 #define BTRFS_ROOT_BACKREF_KEY 144 1106 1107 /* 1108 * root refs make a fast index for listing all of the snapshots and 1109 * subvolumes referenced by a given root. They point directly to the 1110 * directory item in the root that references the subvol 1111 */ 1112 #define BTRFS_ROOT_REF_KEY 156 1113 1114 /* 1115 * extent items are in the extent map tree. These record which blocks 1116 * are used, and how many references there are to each block 1117 */ 1118 #define BTRFS_EXTENT_ITEM_KEY 168 1119 1120 #define BTRFS_TREE_BLOCK_REF_KEY 176 1121 1122 #define BTRFS_EXTENT_DATA_REF_KEY 178 1123 1124 #define BTRFS_EXTENT_REF_V0_KEY 180 1125 1126 #define BTRFS_SHARED_BLOCK_REF_KEY 182 1127 1128 #define BTRFS_SHARED_DATA_REF_KEY 184 1129 1130 /* 1131 * block groups give us hints into the extent allocation trees. Which 1132 * blocks are free etc etc 1133 */ 1134 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 1135 1136 #define BTRFS_DEV_EXTENT_KEY 204 1137 #define BTRFS_DEV_ITEM_KEY 216 1138 #define BTRFS_CHUNK_ITEM_KEY 228 1139 1140 /* 1141 * string items are for debugging. They just store a short string of 1142 * data in the FS 1143 */ 1144 #define BTRFS_STRING_ITEM_KEY 253 1145 1146 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1147 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1148 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1149 #define BTRFS_MOUNT_SSD (1 << 3) 1150 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1151 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1152 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1153 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1154 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1155 #define BTRFS_MOUNT_NOSSD (1 << 9) 1156 #define BTRFS_MOUNT_DISCARD (1 << 10) 1157 1158 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1159 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1160 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1161 BTRFS_MOUNT_##opt) 1162 /* 1163 * Inode flags 1164 */ 1165 #define BTRFS_INODE_NODATASUM (1 << 0) 1166 #define BTRFS_INODE_NODATACOW (1 << 1) 1167 #define BTRFS_INODE_READONLY (1 << 2) 1168 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1169 #define BTRFS_INODE_PREALLOC (1 << 4) 1170 #define BTRFS_INODE_SYNC (1 << 5) 1171 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1172 #define BTRFS_INODE_APPEND (1 << 7) 1173 #define BTRFS_INODE_NODUMP (1 << 8) 1174 #define BTRFS_INODE_NOATIME (1 << 9) 1175 #define BTRFS_INODE_DIRSYNC (1 << 10) 1176 1177 1178 /* some macros to generate set/get funcs for the struct fields. This 1179 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1180 * one for u8: 1181 */ 1182 #define le8_to_cpu(v) (v) 1183 #define cpu_to_le8(v) (v) 1184 #define __le8 u8 1185 1186 #define read_eb_member(eb, ptr, type, member, result) ( \ 1187 read_extent_buffer(eb, (char *)(result), \ 1188 ((unsigned long)(ptr)) + \ 1189 offsetof(type, member), \ 1190 sizeof(((type *)0)->member))) 1191 1192 #define write_eb_member(eb, ptr, type, member, result) ( \ 1193 write_extent_buffer(eb, (char *)(result), \ 1194 ((unsigned long)(ptr)) + \ 1195 offsetof(type, member), \ 1196 sizeof(((type *)0)->member))) 1197 1198 #ifndef BTRFS_SETGET_FUNCS 1199 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1200 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ 1201 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); 1202 #endif 1203 1204 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1205 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1206 { \ 1207 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1208 u##bits res = le##bits##_to_cpu(p->member); \ 1209 kunmap_atomic(p, KM_USER0); \ 1210 return res; \ 1211 } \ 1212 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1213 u##bits val) \ 1214 { \ 1215 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1216 p->member = cpu_to_le##bits(val); \ 1217 kunmap_atomic(p, KM_USER0); \ 1218 } 1219 1220 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1221 static inline u##bits btrfs_##name(type *s) \ 1222 { \ 1223 return le##bits##_to_cpu(s->member); \ 1224 } \ 1225 static inline void btrfs_set_##name(type *s, u##bits val) \ 1226 { \ 1227 s->member = cpu_to_le##bits(val); \ 1228 } 1229 1230 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1231 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1232 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1233 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1234 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1235 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1236 start_offset, 64); 1237 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1238 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1239 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1240 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1241 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1242 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1243 1244 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1245 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1246 total_bytes, 64); 1247 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1248 bytes_used, 64); 1249 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1250 io_align, 32); 1251 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1252 io_width, 32); 1253 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1254 sector_size, 32); 1255 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1256 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1257 dev_group, 32); 1258 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1259 seek_speed, 8); 1260 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1261 bandwidth, 8); 1262 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1263 generation, 64); 1264 1265 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d) 1266 { 1267 return (char *)d + offsetof(struct btrfs_dev_item, uuid); 1268 } 1269 1270 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d) 1271 { 1272 return (char *)d + offsetof(struct btrfs_dev_item, fsid); 1273 } 1274 1275 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1276 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1277 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1278 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1279 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1280 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1281 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1282 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1283 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1284 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1285 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1286 1287 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1288 { 1289 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1290 } 1291 1292 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1293 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1294 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1295 stripe_len, 64); 1296 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1297 io_align, 32); 1298 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1299 io_width, 32); 1300 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1301 sector_size, 32); 1302 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1303 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1304 num_stripes, 16); 1305 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1306 sub_stripes, 16); 1307 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1308 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1309 1310 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1311 int nr) 1312 { 1313 unsigned long offset = (unsigned long)c; 1314 offset += offsetof(struct btrfs_chunk, stripe); 1315 offset += nr * sizeof(struct btrfs_stripe); 1316 return (struct btrfs_stripe *)offset; 1317 } 1318 1319 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1320 { 1321 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1322 } 1323 1324 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1325 struct btrfs_chunk *c, int nr) 1326 { 1327 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1328 } 1329 1330 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb, 1331 struct btrfs_chunk *c, int nr, 1332 u64 val) 1333 { 1334 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val); 1335 } 1336 1337 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1338 struct btrfs_chunk *c, int nr) 1339 { 1340 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1341 } 1342 1343 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb, 1344 struct btrfs_chunk *c, int nr, 1345 u64 val) 1346 { 1347 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val); 1348 } 1349 1350 /* struct btrfs_block_group_item */ 1351 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1352 used, 64); 1353 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1354 used, 64); 1355 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1356 struct btrfs_block_group_item, chunk_objectid, 64); 1357 1358 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1359 struct btrfs_block_group_item, chunk_objectid, 64); 1360 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1361 struct btrfs_block_group_item, flags, 64); 1362 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1363 struct btrfs_block_group_item, flags, 64); 1364 1365 /* struct btrfs_inode_ref */ 1366 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1367 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1368 1369 /* struct btrfs_inode_item */ 1370 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1371 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1372 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1373 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1374 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1375 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1376 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1377 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1378 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1379 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1380 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1381 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1382 1383 static inline struct btrfs_timespec * 1384 btrfs_inode_atime(struct btrfs_inode_item *inode_item) 1385 { 1386 unsigned long ptr = (unsigned long)inode_item; 1387 ptr += offsetof(struct btrfs_inode_item, atime); 1388 return (struct btrfs_timespec *)ptr; 1389 } 1390 1391 static inline struct btrfs_timespec * 1392 btrfs_inode_mtime(struct btrfs_inode_item *inode_item) 1393 { 1394 unsigned long ptr = (unsigned long)inode_item; 1395 ptr += offsetof(struct btrfs_inode_item, mtime); 1396 return (struct btrfs_timespec *)ptr; 1397 } 1398 1399 static inline struct btrfs_timespec * 1400 btrfs_inode_ctime(struct btrfs_inode_item *inode_item) 1401 { 1402 unsigned long ptr = (unsigned long)inode_item; 1403 ptr += offsetof(struct btrfs_inode_item, ctime); 1404 return (struct btrfs_timespec *)ptr; 1405 } 1406 1407 static inline struct btrfs_timespec * 1408 btrfs_inode_otime(struct btrfs_inode_item *inode_item) 1409 { 1410 unsigned long ptr = (unsigned long)inode_item; 1411 ptr += offsetof(struct btrfs_inode_item, otime); 1412 return (struct btrfs_timespec *)ptr; 1413 } 1414 1415 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1416 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1417 1418 /* struct btrfs_dev_extent */ 1419 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1420 chunk_tree, 64); 1421 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1422 chunk_objectid, 64); 1423 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1424 chunk_offset, 64); 1425 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1426 1427 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1428 { 1429 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1430 return (u8 *)((unsigned long)dev + ptr); 1431 } 1432 1433 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1434 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1435 generation, 64); 1436 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1437 1438 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); 1439 1440 1441 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1442 1443 static inline void btrfs_tree_block_key(struct extent_buffer *eb, 1444 struct btrfs_tree_block_info *item, 1445 struct btrfs_disk_key *key) 1446 { 1447 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1448 } 1449 1450 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, 1451 struct btrfs_tree_block_info *item, 1452 struct btrfs_disk_key *key) 1453 { 1454 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1455 } 1456 1457 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1458 root, 64); 1459 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1460 objectid, 64); 1461 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1462 offset, 64); 1463 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1464 count, 32); 1465 1466 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1467 count, 32); 1468 1469 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1470 type, 8); 1471 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1472 offset, 64); 1473 1474 static inline u32 btrfs_extent_inline_ref_size(int type) 1475 { 1476 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1477 type == BTRFS_SHARED_BLOCK_REF_KEY) 1478 return sizeof(struct btrfs_extent_inline_ref); 1479 if (type == BTRFS_SHARED_DATA_REF_KEY) 1480 return sizeof(struct btrfs_shared_data_ref) + 1481 sizeof(struct btrfs_extent_inline_ref); 1482 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1483 return sizeof(struct btrfs_extent_data_ref) + 1484 offsetof(struct btrfs_extent_inline_ref, offset); 1485 BUG(); 1486 return 0; 1487 } 1488 1489 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); 1490 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, 1491 generation, 64); 1492 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); 1493 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32); 1494 1495 /* struct btrfs_node */ 1496 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1497 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1498 1499 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1500 { 1501 unsigned long ptr; 1502 ptr = offsetof(struct btrfs_node, ptrs) + 1503 sizeof(struct btrfs_key_ptr) * nr; 1504 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1505 } 1506 1507 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1508 int nr, u64 val) 1509 { 1510 unsigned long ptr; 1511 ptr = offsetof(struct btrfs_node, ptrs) + 1512 sizeof(struct btrfs_key_ptr) * nr; 1513 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1514 } 1515 1516 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1517 { 1518 unsigned long ptr; 1519 ptr = offsetof(struct btrfs_node, ptrs) + 1520 sizeof(struct btrfs_key_ptr) * nr; 1521 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1522 } 1523 1524 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1525 int nr, u64 val) 1526 { 1527 unsigned long ptr; 1528 ptr = offsetof(struct btrfs_node, ptrs) + 1529 sizeof(struct btrfs_key_ptr) * nr; 1530 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1531 } 1532 1533 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1534 { 1535 return offsetof(struct btrfs_node, ptrs) + 1536 sizeof(struct btrfs_key_ptr) * nr; 1537 } 1538 1539 void btrfs_node_key(struct extent_buffer *eb, 1540 struct btrfs_disk_key *disk_key, int nr); 1541 1542 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1543 struct btrfs_disk_key *disk_key, int nr) 1544 { 1545 unsigned long ptr; 1546 ptr = btrfs_node_key_ptr_offset(nr); 1547 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1548 struct btrfs_key_ptr, key, disk_key); 1549 } 1550 1551 /* struct btrfs_item */ 1552 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1553 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1554 1555 static inline unsigned long btrfs_item_nr_offset(int nr) 1556 { 1557 return offsetof(struct btrfs_leaf, items) + 1558 sizeof(struct btrfs_item) * nr; 1559 } 1560 1561 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, 1562 int nr) 1563 { 1564 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1565 } 1566 1567 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1568 struct btrfs_item *item) 1569 { 1570 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1571 } 1572 1573 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1574 { 1575 return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); 1576 } 1577 1578 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1579 { 1580 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); 1581 } 1582 1583 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1584 { 1585 return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); 1586 } 1587 1588 static inline void btrfs_item_key(struct extent_buffer *eb, 1589 struct btrfs_disk_key *disk_key, int nr) 1590 { 1591 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1592 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1593 } 1594 1595 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1596 struct btrfs_disk_key *disk_key, int nr) 1597 { 1598 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1599 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1600 } 1601 1602 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1603 1604 /* 1605 * struct btrfs_root_ref 1606 */ 1607 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1608 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1609 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1610 1611 /* struct btrfs_dir_item */ 1612 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1613 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1614 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1615 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1616 1617 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1618 struct btrfs_dir_item *item, 1619 struct btrfs_disk_key *key) 1620 { 1621 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1622 } 1623 1624 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1625 struct btrfs_dir_item *item, 1626 struct btrfs_disk_key *key) 1627 { 1628 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1629 } 1630 1631 /* struct btrfs_disk_key */ 1632 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1633 objectid, 64); 1634 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1635 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1636 1637 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1638 struct btrfs_disk_key *disk) 1639 { 1640 cpu->offset = le64_to_cpu(disk->offset); 1641 cpu->type = disk->type; 1642 cpu->objectid = le64_to_cpu(disk->objectid); 1643 } 1644 1645 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1646 struct btrfs_key *cpu) 1647 { 1648 disk->offset = cpu_to_le64(cpu->offset); 1649 disk->type = cpu->type; 1650 disk->objectid = cpu_to_le64(cpu->objectid); 1651 } 1652 1653 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1654 struct btrfs_key *key, int nr) 1655 { 1656 struct btrfs_disk_key disk_key; 1657 btrfs_node_key(eb, &disk_key, nr); 1658 btrfs_disk_key_to_cpu(key, &disk_key); 1659 } 1660 1661 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1662 struct btrfs_key *key, int nr) 1663 { 1664 struct btrfs_disk_key disk_key; 1665 btrfs_item_key(eb, &disk_key, nr); 1666 btrfs_disk_key_to_cpu(key, &disk_key); 1667 } 1668 1669 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1670 struct btrfs_dir_item *item, 1671 struct btrfs_key *key) 1672 { 1673 struct btrfs_disk_key disk_key; 1674 btrfs_dir_item_key(eb, item, &disk_key); 1675 btrfs_disk_key_to_cpu(key, &disk_key); 1676 } 1677 1678 1679 static inline u8 btrfs_key_type(struct btrfs_key *key) 1680 { 1681 return key->type; 1682 } 1683 1684 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1685 { 1686 key->type = val; 1687 } 1688 1689 /* struct btrfs_header */ 1690 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1691 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1692 generation, 64); 1693 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1694 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1695 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1696 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1697 1698 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1699 { 1700 return (btrfs_header_flags(eb) & flag) == flag; 1701 } 1702 1703 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1704 { 1705 u64 flags = btrfs_header_flags(eb); 1706 btrfs_set_header_flags(eb, flags | flag); 1707 return (flags & flag) == flag; 1708 } 1709 1710 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 1711 { 1712 u64 flags = btrfs_header_flags(eb); 1713 btrfs_set_header_flags(eb, flags & ~flag); 1714 return (flags & flag) == flag; 1715 } 1716 1717 static inline int btrfs_header_backref_rev(struct extent_buffer *eb) 1718 { 1719 u64 flags = btrfs_header_flags(eb); 1720 return flags >> BTRFS_BACKREF_REV_SHIFT; 1721 } 1722 1723 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 1724 int rev) 1725 { 1726 u64 flags = btrfs_header_flags(eb); 1727 flags &= ~BTRFS_BACKREF_REV_MASK; 1728 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 1729 btrfs_set_header_flags(eb, flags); 1730 } 1731 1732 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb) 1733 { 1734 unsigned long ptr = offsetof(struct btrfs_header, fsid); 1735 return (u8 *)ptr; 1736 } 1737 1738 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 1739 { 1740 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid); 1741 return (u8 *)ptr; 1742 } 1743 1744 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb) 1745 { 1746 unsigned long ptr = offsetof(struct btrfs_super_block, fsid); 1747 return (u8 *)ptr; 1748 } 1749 1750 static inline u8 *btrfs_header_csum(struct extent_buffer *eb) 1751 { 1752 unsigned long ptr = offsetof(struct btrfs_header, csum); 1753 return (u8 *)ptr; 1754 } 1755 1756 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb) 1757 { 1758 return NULL; 1759 } 1760 1761 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb) 1762 { 1763 return NULL; 1764 } 1765 1766 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb) 1767 { 1768 return NULL; 1769 } 1770 1771 static inline int btrfs_is_leaf(struct extent_buffer *eb) 1772 { 1773 return btrfs_header_level(eb) == 0; 1774 } 1775 1776 /* struct btrfs_root_item */ 1777 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 1778 generation, 64); 1779 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 1780 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 1781 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 1782 1783 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 1784 generation, 64); 1785 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 1786 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 1787 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 1788 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 1789 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 1790 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 1791 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 1792 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 1793 last_snapshot, 64); 1794 1795 /* struct btrfs_super_block */ 1796 1797 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 1798 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 1799 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 1800 generation, 64); 1801 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 1802 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 1803 struct btrfs_super_block, sys_chunk_array_size, 32); 1804 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 1805 struct btrfs_super_block, chunk_root_generation, 64); 1806 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 1807 root_level, 8); 1808 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 1809 chunk_root, 64); 1810 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 1811 chunk_root_level, 8); 1812 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 1813 log_root, 64); 1814 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 1815 log_root_transid, 64); 1816 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 1817 log_root_level, 8); 1818 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 1819 total_bytes, 64); 1820 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 1821 bytes_used, 64); 1822 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 1823 sectorsize, 32); 1824 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 1825 nodesize, 32); 1826 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, 1827 leafsize, 32); 1828 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 1829 stripesize, 32); 1830 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 1831 root_dir_objectid, 64); 1832 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 1833 num_devices, 64); 1834 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 1835 compat_flags, 64); 1836 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 1837 compat_flags, 64); 1838 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 1839 incompat_flags, 64); 1840 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 1841 csum_type, 16); 1842 1843 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 1844 { 1845 int t = btrfs_super_csum_type(s); 1846 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes)); 1847 return btrfs_csum_sizes[t]; 1848 } 1849 1850 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 1851 { 1852 return offsetof(struct btrfs_leaf, items); 1853 } 1854 1855 /* struct btrfs_file_extent_item */ 1856 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 1857 1858 static inline unsigned long 1859 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 1860 { 1861 unsigned long offset = (unsigned long)e; 1862 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); 1863 return offset; 1864 } 1865 1866 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 1867 { 1868 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; 1869 } 1870 1871 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 1872 disk_bytenr, 64); 1873 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 1874 generation, 64); 1875 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 1876 disk_num_bytes, 64); 1877 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 1878 offset, 64); 1879 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 1880 num_bytes, 64); 1881 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 1882 ram_bytes, 64); 1883 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 1884 compression, 8); 1885 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 1886 encryption, 8); 1887 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 1888 other_encoding, 16); 1889 1890 /* this returns the number of file bytes represented by the inline item. 1891 * If an item is compressed, this is the uncompressed size 1892 */ 1893 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 1894 struct btrfs_file_extent_item *e) 1895 { 1896 return btrfs_file_extent_ram_bytes(eb, e); 1897 } 1898 1899 /* 1900 * this returns the number of bytes used by the item on disk, minus the 1901 * size of any extent headers. If a file is compressed on disk, this is 1902 * the compressed size 1903 */ 1904 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 1905 struct btrfs_item *e) 1906 { 1907 unsigned long offset; 1908 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); 1909 return btrfs_item_size(eb, e) - offset; 1910 } 1911 1912 static inline struct btrfs_root *btrfs_sb(struct super_block *sb) 1913 { 1914 return sb->s_fs_info; 1915 } 1916 1917 static inline int btrfs_set_root_name(struct btrfs_root *root, 1918 const char *name, int len) 1919 { 1920 /* if we already have a name just free it */ 1921 kfree(root->name); 1922 1923 root->name = kmalloc(len+1, GFP_KERNEL); 1924 if (!root->name) 1925 return -ENOMEM; 1926 1927 memcpy(root->name, name, len); 1928 root->name[len] = '\0'; 1929 1930 return 0; 1931 } 1932 1933 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) 1934 { 1935 if (level == 0) 1936 return root->leafsize; 1937 return root->nodesize; 1938 } 1939 1940 /* helper function to cast into the data area of the leaf. */ 1941 #define btrfs_item_ptr(leaf, slot, type) \ 1942 ((type *)(btrfs_leaf_data(leaf) + \ 1943 btrfs_item_offset_nr(leaf, slot))) 1944 1945 #define btrfs_item_ptr_offset(leaf, slot) \ 1946 ((unsigned long)(btrfs_leaf_data(leaf) + \ 1947 btrfs_item_offset_nr(leaf, slot))) 1948 1949 static inline struct dentry *fdentry(struct file *file) 1950 { 1951 return file->f_path.dentry; 1952 } 1953 1954 /* extent-tree.c */ 1955 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 1956 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 1957 struct btrfs_root *root, unsigned long count); 1958 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); 1959 int btrfs_pin_extent(struct btrfs_root *root, 1960 u64 bytenr, u64 num, int reserved); 1961 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, 1962 struct btrfs_root *root, struct extent_buffer *leaf); 1963 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 1964 struct btrfs_root *root, 1965 u64 objectid, u64 offset, u64 bytenr); 1966 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy); 1967 struct btrfs_block_group_cache *btrfs_lookup_block_group( 1968 struct btrfs_fs_info *info, 1969 u64 bytenr); 1970 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 1971 u64 btrfs_find_block_group(struct btrfs_root *root, 1972 u64 search_start, u64 search_hint, int owner); 1973 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, 1974 struct btrfs_root *root, u32 blocksize, 1975 u64 parent, u64 root_objectid, 1976 struct btrfs_disk_key *key, int level, 1977 u64 hint, u64 empty_size); 1978 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, 1979 struct btrfs_root *root, 1980 u64 bytenr, u32 blocksize, 1981 int level); 1982 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 1983 struct btrfs_root *root, 1984 u64 root_objectid, u64 owner, 1985 u64 offset, struct btrfs_key *ins); 1986 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 1987 struct btrfs_root *root, 1988 u64 root_objectid, u64 owner, u64 offset, 1989 struct btrfs_key *ins); 1990 int btrfs_reserve_extent(struct btrfs_trans_handle *trans, 1991 struct btrfs_root *root, 1992 u64 num_bytes, u64 min_alloc_size, 1993 u64 empty_size, u64 hint_byte, 1994 u64 search_end, struct btrfs_key *ins, 1995 u64 data); 1996 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1997 struct extent_buffer *buf, int full_backref); 1998 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1999 struct extent_buffer *buf, int full_backref); 2000 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2001 struct btrfs_root *root, 2002 u64 bytenr, u64 num_bytes, u64 flags, 2003 int is_data); 2004 int btrfs_free_extent(struct btrfs_trans_handle *trans, 2005 struct btrfs_root *root, 2006 u64 bytenr, u64 num_bytes, u64 parent, 2007 u64 root_objectid, u64 owner, u64 offset); 2008 2009 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 2010 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, 2011 struct btrfs_root *root); 2012 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 2013 struct btrfs_root *root); 2014 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2015 struct btrfs_root *root, 2016 u64 bytenr, u64 num_bytes, u64 parent, 2017 u64 root_objectid, u64 owner, u64 offset); 2018 2019 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 2020 struct btrfs_root *root); 2021 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 2022 int btrfs_free_block_groups(struct btrfs_fs_info *info); 2023 int btrfs_read_block_groups(struct btrfs_root *root); 2024 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); 2025 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 2026 struct btrfs_root *root, u64 bytes_used, 2027 u64 type, u64 chunk_objectid, u64 chunk_offset, 2028 u64 size); 2029 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 2030 struct btrfs_root *root, u64 group_start); 2031 int btrfs_prepare_block_group_relocation(struct btrfs_root *root, 2032 struct btrfs_block_group_cache *group); 2033 2034 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); 2035 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); 2036 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2037 2038 int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items); 2039 int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items); 2040 int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root, 2041 struct inode *inode, int num_items); 2042 int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root, 2043 struct inode *inode, int num_items); 2044 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, 2045 u64 bytes); 2046 void btrfs_free_reserved_data_space(struct btrfs_root *root, 2047 struct inode *inode, u64 bytes); 2048 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, 2049 u64 bytes); 2050 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, 2051 u64 bytes); 2052 /* ctree.c */ 2053 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, 2054 int level, int *slot); 2055 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); 2056 int btrfs_previous_item(struct btrfs_root *root, 2057 struct btrfs_path *path, u64 min_objectid, 2058 int type); 2059 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, 2060 struct btrfs_root *root, struct btrfs_path *path, 2061 struct btrfs_key *new_key); 2062 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2063 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 2064 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2065 struct btrfs_key *key, int lowest_level, 2066 int cache_only, u64 min_trans); 2067 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2068 struct btrfs_key *max_key, 2069 struct btrfs_path *path, int cache_only, 2070 u64 min_trans); 2071 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2072 struct btrfs_root *root, struct extent_buffer *buf, 2073 struct extent_buffer *parent, int parent_slot, 2074 struct extent_buffer **cow_ret); 2075 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2076 struct btrfs_root *root, 2077 struct extent_buffer *buf, 2078 struct extent_buffer **cow_ret, u64 new_root_objectid); 2079 int btrfs_block_can_be_shared(struct btrfs_root *root, 2080 struct extent_buffer *buf); 2081 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root 2082 *root, struct btrfs_path *path, u32 data_size); 2083 int btrfs_truncate_item(struct btrfs_trans_handle *trans, 2084 struct btrfs_root *root, 2085 struct btrfs_path *path, 2086 u32 new_size, int from_end); 2087 int btrfs_split_item(struct btrfs_trans_handle *trans, 2088 struct btrfs_root *root, 2089 struct btrfs_path *path, 2090 struct btrfs_key *new_key, 2091 unsigned long split_offset); 2092 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 2093 *root, struct btrfs_key *key, struct btrfs_path *p, int 2094 ins_len, int cow); 2095 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2096 struct btrfs_root *root, struct extent_buffer *parent, 2097 int start_slot, int cache_only, u64 *last_ret, 2098 struct btrfs_key *progress); 2099 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p); 2100 struct btrfs_path *btrfs_alloc_path(void); 2101 void btrfs_free_path(struct btrfs_path *p); 2102 void btrfs_set_path_blocking(struct btrfs_path *p); 2103 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 2104 2105 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2106 struct btrfs_path *path, int slot, int nr); 2107 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2108 struct btrfs_root *root, 2109 struct btrfs_path *path) 2110 { 2111 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2112 } 2113 2114 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 2115 *root, struct btrfs_key *key, void *data, u32 data_size); 2116 int btrfs_insert_some_items(struct btrfs_trans_handle *trans, 2117 struct btrfs_root *root, 2118 struct btrfs_path *path, 2119 struct btrfs_key *cpu_key, u32 *data_size, 2120 int nr); 2121 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2122 struct btrfs_root *root, 2123 struct btrfs_path *path, 2124 struct btrfs_key *cpu_key, u32 *data_size, int nr); 2125 2126 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2127 struct btrfs_root *root, 2128 struct btrfs_path *path, 2129 struct btrfs_key *key, 2130 u32 data_size) 2131 { 2132 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2133 } 2134 2135 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2136 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2137 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 2138 int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref); 2139 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2140 struct btrfs_root *root, 2141 struct extent_buffer *node, 2142 struct extent_buffer *parent); 2143 /* root-item.c */ 2144 int btrfs_find_root_ref(struct btrfs_root *tree_root, 2145 struct btrfs_path *path, 2146 u64 root_id, u64 ref_id); 2147 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 2148 struct btrfs_root *tree_root, 2149 u64 root_id, u64 ref_id, u64 dirid, u64 sequence, 2150 const char *name, int name_len); 2151 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, 2152 struct btrfs_root *tree_root, 2153 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, 2154 const char *name, int name_len); 2155 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2156 struct btrfs_key *key); 2157 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 2158 *root, struct btrfs_key *key, struct btrfs_root_item 2159 *item); 2160 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root 2161 *root, struct btrfs_key *key, struct btrfs_root_item 2162 *item); 2163 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct 2164 btrfs_root_item *item, struct btrfs_key *key); 2165 int btrfs_search_root(struct btrfs_root *root, u64 search_start, 2166 u64 *found_objectid); 2167 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid); 2168 int btrfs_find_orphan_roots(struct btrfs_root *tree_root); 2169 int btrfs_set_root_node(struct btrfs_root_item *item, 2170 struct extent_buffer *node); 2171 /* dir-item.c */ 2172 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2173 struct btrfs_root *root, const char *name, 2174 int name_len, u64 dir, 2175 struct btrfs_key *location, u8 type, u64 index); 2176 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2177 struct btrfs_root *root, 2178 struct btrfs_path *path, u64 dir, 2179 const char *name, int name_len, 2180 int mod); 2181 struct btrfs_dir_item * 2182 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2183 struct btrfs_root *root, 2184 struct btrfs_path *path, u64 dir, 2185 u64 objectid, const char *name, int name_len, 2186 int mod); 2187 struct btrfs_dir_item * 2188 btrfs_search_dir_index_item(struct btrfs_root *root, 2189 struct btrfs_path *path, u64 dirid, 2190 const char *name, int name_len); 2191 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2192 struct btrfs_path *path, 2193 const char *name, int name_len); 2194 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2195 struct btrfs_root *root, 2196 struct btrfs_path *path, 2197 struct btrfs_dir_item *di); 2198 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2199 struct btrfs_root *root, const char *name, 2200 u16 name_len, const void *data, u16 data_len, 2201 u64 dir); 2202 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2203 struct btrfs_root *root, 2204 struct btrfs_path *path, u64 dir, 2205 const char *name, u16 name_len, 2206 int mod); 2207 2208 /* orphan.c */ 2209 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2210 struct btrfs_root *root, u64 offset); 2211 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2212 struct btrfs_root *root, u64 offset); 2213 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2214 2215 /* inode-map.c */ 2216 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, 2217 struct btrfs_root *fs_root, 2218 u64 dirid, u64 *objectid); 2219 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid); 2220 2221 /* inode-item.c */ 2222 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2223 struct btrfs_root *root, 2224 const char *name, int name_len, 2225 u64 inode_objectid, u64 ref_objectid, u64 index); 2226 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2227 struct btrfs_root *root, 2228 const char *name, int name_len, 2229 u64 inode_objectid, u64 ref_objectid, u64 *index); 2230 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2231 struct btrfs_root *root, 2232 struct btrfs_path *path, u64 objectid); 2233 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2234 *root, struct btrfs_path *path, 2235 struct btrfs_key *location, int mod); 2236 2237 /* file-item.c */ 2238 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2239 struct btrfs_root *root, u64 bytenr, u64 len); 2240 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 2241 struct bio *bio, u32 *dst); 2242 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2243 struct btrfs_root *root, 2244 u64 objectid, u64 pos, 2245 u64 disk_offset, u64 disk_num_bytes, 2246 u64 num_bytes, u64 offset, u64 ram_bytes, 2247 u8 compression, u8 encryption, u16 other_encoding); 2248 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2249 struct btrfs_root *root, 2250 struct btrfs_path *path, u64 objectid, 2251 u64 bytenr, int mod); 2252 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2253 struct btrfs_root *root, 2254 struct btrfs_ordered_sum *sums); 2255 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 2256 struct bio *bio, u64 file_start, int contig); 2257 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode, 2258 u64 start, unsigned long len); 2259 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, 2260 struct btrfs_root *root, 2261 struct btrfs_path *path, 2262 u64 bytenr, int cow); 2263 int btrfs_csum_truncate(struct btrfs_trans_handle *trans, 2264 struct btrfs_root *root, struct btrfs_path *path, 2265 u64 isize); 2266 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, 2267 u64 end, struct list_head *list); 2268 /* inode.c */ 2269 2270 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 2271 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 2272 #define ClearPageChecked ClearPageFsMisc 2273 #define SetPageChecked SetPageFsMisc 2274 #define PageChecked PageFsMisc 2275 #endif 2276 2277 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2278 int btrfs_set_inode_index(struct inode *dir, u64 *index); 2279 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2280 struct btrfs_root *root, 2281 struct inode *dir, struct inode *inode, 2282 const char *name, int name_len); 2283 int btrfs_add_link(struct btrfs_trans_handle *trans, 2284 struct inode *parent_inode, struct inode *inode, 2285 const char *name, int name_len, int add_backref, u64 index); 2286 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, 2287 struct btrfs_root *root, 2288 struct inode *dir, u64 objectid, 2289 const char *name, int name_len); 2290 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 2291 struct btrfs_root *root, 2292 struct inode *inode, u64 new_size, 2293 u32 min_type); 2294 2295 int btrfs_start_delalloc_inodes(struct btrfs_root *root); 2296 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end); 2297 int btrfs_writepages(struct address_space *mapping, 2298 struct writeback_control *wbc); 2299 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 2300 struct btrfs_root *new_root, 2301 u64 new_dirid, u64 alloc_hint); 2302 int btrfs_merge_bio_hook(struct page *page, unsigned long offset, 2303 size_t size, struct bio *bio, unsigned long bio_flags); 2304 2305 unsigned long btrfs_force_ra(struct address_space *mapping, 2306 struct file_ra_state *ra, struct file *file, 2307 pgoff_t offset, pgoff_t last_index); 2308 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2309 int btrfs_readpage(struct file *file, struct page *page); 2310 void btrfs_delete_inode(struct inode *inode); 2311 void btrfs_put_inode(struct inode *inode); 2312 int btrfs_write_inode(struct inode *inode, int wait); 2313 void btrfs_dirty_inode(struct inode *inode); 2314 struct inode *btrfs_alloc_inode(struct super_block *sb); 2315 void btrfs_destroy_inode(struct inode *inode); 2316 void btrfs_drop_inode(struct inode *inode); 2317 int btrfs_init_cachep(void); 2318 void btrfs_destroy_cachep(void); 2319 long btrfs_ioctl_trans_end(struct file *file); 2320 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 2321 struct btrfs_root *root); 2322 int btrfs_commit_write(struct file *file, struct page *page, 2323 unsigned from, unsigned to); 2324 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 2325 size_t page_offset, u64 start, u64 end, 2326 int create); 2327 int btrfs_update_inode(struct btrfs_trans_handle *trans, 2328 struct btrfs_root *root, 2329 struct inode *inode); 2330 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 2331 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); 2332 void btrfs_orphan_cleanup(struct btrfs_root *root); 2333 int btrfs_cont_expand(struct inode *inode, loff_t size); 2334 int btrfs_invalidate_inodes(struct btrfs_root *root); 2335 extern const struct dentry_operations btrfs_dentry_operations; 2336 2337 /* ioctl.c */ 2338 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2339 void btrfs_update_iflags(struct inode *inode); 2340 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); 2341 2342 /* file.c */ 2343 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync); 2344 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 2345 int skip_pinned); 2346 int btrfs_check_file(struct btrfs_root *root, struct inode *inode); 2347 extern const struct file_operations btrfs_file_operations; 2348 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 2349 struct btrfs_root *root, struct inode *inode, 2350 u64 start, u64 end, u64 locked_end, 2351 u64 inline_limit, u64 *hint_block, int drop_cache); 2352 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 2353 struct btrfs_root *root, 2354 struct inode *inode, u64 start, u64 end); 2355 int btrfs_release_file(struct inode *inode, struct file *file); 2356 2357 /* tree-defrag.c */ 2358 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 2359 struct btrfs_root *root, int cache_only); 2360 2361 /* sysfs.c */ 2362 int btrfs_init_sysfs(void); 2363 void btrfs_exit_sysfs(void); 2364 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs); 2365 int btrfs_sysfs_add_root(struct btrfs_root *root); 2366 void btrfs_sysfs_del_root(struct btrfs_root *root); 2367 void btrfs_sysfs_del_super(struct btrfs_fs_info *root); 2368 2369 /* xattr.c */ 2370 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 2371 2372 /* super.c */ 2373 u64 btrfs_parse_size(char *str); 2374 int btrfs_parse_options(struct btrfs_root *root, char *options); 2375 int btrfs_sync_fs(struct super_block *sb, int wait); 2376 2377 /* acl.c */ 2378 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 2379 int btrfs_check_acl(struct inode *inode, int mask); 2380 #else 2381 #define btrfs_check_acl NULL 2382 #endif 2383 int btrfs_init_acl(struct inode *inode, struct inode *dir); 2384 int btrfs_acl_chmod(struct inode *inode); 2385 2386 /* relocation.c */ 2387 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 2388 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 2389 struct btrfs_root *root); 2390 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 2391 struct btrfs_root *root); 2392 int btrfs_recover_relocation(struct btrfs_root *root); 2393 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 2394 #endif 2395