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 <linux/slab.h> 30 #include <linux/kobject.h> 31 #include <trace/events/btrfs.h> 32 #include <asm/kmap_types.h> 33 #include "extent_io.h" 34 #include "extent_map.h" 35 #include "async-thread.h" 36 37 struct btrfs_trans_handle; 38 struct btrfs_transaction; 39 struct btrfs_pending_snapshot; 40 extern struct kmem_cache *btrfs_trans_handle_cachep; 41 extern struct kmem_cache *btrfs_transaction_cachep; 42 extern struct kmem_cache *btrfs_bit_radix_cachep; 43 extern struct kmem_cache *btrfs_path_cachep; 44 extern struct kmem_cache *btrfs_free_space_cachep; 45 struct btrfs_ordered_sum; 46 47 #define BTRFS_MAGIC "_BHRfS_M" 48 49 #define BTRFS_MAX_LEVEL 8 50 51 #define BTRFS_COMPAT_EXTENT_TREE_V0 52 53 /* 54 * files bigger than this get some pre-flushing when they are added 55 * to the ordered operations list. That way we limit the total 56 * work done by the commit 57 */ 58 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024) 59 60 /* holds pointers to all of the tree roots */ 61 #define BTRFS_ROOT_TREE_OBJECTID 1ULL 62 63 /* stores information about which extents are in use, and reference counts */ 64 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL 65 66 /* 67 * chunk tree stores translations from logical -> physical block numbering 68 * the super block points to the chunk tree 69 */ 70 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL 71 72 /* 73 * stores information about which areas of a given device are in use. 74 * one per device. The tree of tree roots points to the device tree 75 */ 76 #define BTRFS_DEV_TREE_OBJECTID 4ULL 77 78 /* one per subvolume, storing files and directories */ 79 #define BTRFS_FS_TREE_OBJECTID 5ULL 80 81 /* directory objectid inside the root tree */ 82 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL 83 84 /* holds checksums of all the data extents */ 85 #define BTRFS_CSUM_TREE_OBJECTID 7ULL 86 87 /* orhpan objectid for tracking unlinked/truncated files */ 88 #define BTRFS_ORPHAN_OBJECTID -5ULL 89 90 /* does write ahead logging to speed up fsyncs */ 91 #define BTRFS_TREE_LOG_OBJECTID -6ULL 92 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL 93 94 /* for space balancing */ 95 #define BTRFS_TREE_RELOC_OBJECTID -8ULL 96 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL 97 98 /* 99 * extent checksums all have this objectid 100 * this allows them to share the logging tree 101 * for fsyncs 102 */ 103 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL 104 105 /* For storing free space cache */ 106 #define BTRFS_FREE_SPACE_OBJECTID -11ULL 107 108 /* dummy objectid represents multiple objectids */ 109 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL 110 111 /* 112 * All files have objectids in this range. 113 */ 114 #define BTRFS_FIRST_FREE_OBJECTID 256ULL 115 #define BTRFS_LAST_FREE_OBJECTID -256ULL 116 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL 117 118 119 /* 120 * the device items go into the chunk tree. The key is in the form 121 * [ 1 BTRFS_DEV_ITEM_KEY device_id ] 122 */ 123 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL 124 125 #define BTRFS_BTREE_INODE_OBJECTID 1 126 127 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 128 129 /* 130 * we can actually store much bigger names, but lets not confuse the rest 131 * of linux 132 */ 133 #define BTRFS_NAME_LEN 255 134 135 /* 32 bytes in various csum fields */ 136 #define BTRFS_CSUM_SIZE 32 137 138 /* csum types */ 139 #define BTRFS_CSUM_TYPE_CRC32 0 140 141 static int btrfs_csum_sizes[] = { 4, 0 }; 142 143 /* four bytes for CRC32 */ 144 #define BTRFS_EMPTY_DIR_SIZE 0 145 146 #define BTRFS_FT_UNKNOWN 0 147 #define BTRFS_FT_REG_FILE 1 148 #define BTRFS_FT_DIR 2 149 #define BTRFS_FT_CHRDEV 3 150 #define BTRFS_FT_BLKDEV 4 151 #define BTRFS_FT_FIFO 5 152 #define BTRFS_FT_SOCK 6 153 #define BTRFS_FT_SYMLINK 7 154 #define BTRFS_FT_XATTR 8 155 #define BTRFS_FT_MAX 9 156 157 /* 158 * The key defines the order in the tree, and so it also defines (optimal) 159 * block layout. 160 * 161 * objectid corresponds to the inode number. 162 * 163 * type tells us things about the object, and is a kind of stream selector. 164 * so for a given inode, keys with type of 1 might refer to the inode data, 165 * type of 2 may point to file data in the btree and type == 3 may point to 166 * extents. 167 * 168 * offset is the starting byte offset for this key in the stream. 169 * 170 * btrfs_disk_key is in disk byte order. struct btrfs_key is always 171 * in cpu native order. Otherwise they are identical and their sizes 172 * should be the same (ie both packed) 173 */ 174 struct btrfs_disk_key { 175 __le64 objectid; 176 u8 type; 177 __le64 offset; 178 } __attribute__ ((__packed__)); 179 180 struct btrfs_key { 181 u64 objectid; 182 u8 type; 183 u64 offset; 184 } __attribute__ ((__packed__)); 185 186 struct btrfs_mapping_tree { 187 struct extent_map_tree map_tree; 188 }; 189 190 #define BTRFS_UUID_SIZE 16 191 struct btrfs_dev_item { 192 /* the internal btrfs device id */ 193 __le64 devid; 194 195 /* size of the device */ 196 __le64 total_bytes; 197 198 /* bytes used */ 199 __le64 bytes_used; 200 201 /* optimal io alignment for this device */ 202 __le32 io_align; 203 204 /* optimal io width for this device */ 205 __le32 io_width; 206 207 /* minimal io size for this device */ 208 __le32 sector_size; 209 210 /* type and info about this device */ 211 __le64 type; 212 213 /* expected generation for this device */ 214 __le64 generation; 215 216 /* 217 * starting byte of this partition on the device, 218 * to allow for stripe alignment in the future 219 */ 220 __le64 start_offset; 221 222 /* grouping information for allocation decisions */ 223 __le32 dev_group; 224 225 /* seek speed 0-100 where 100 is fastest */ 226 u8 seek_speed; 227 228 /* bandwidth 0-100 where 100 is fastest */ 229 u8 bandwidth; 230 231 /* btrfs generated uuid for this device */ 232 u8 uuid[BTRFS_UUID_SIZE]; 233 234 /* uuid of FS who owns this device */ 235 u8 fsid[BTRFS_UUID_SIZE]; 236 } __attribute__ ((__packed__)); 237 238 struct btrfs_stripe { 239 __le64 devid; 240 __le64 offset; 241 u8 dev_uuid[BTRFS_UUID_SIZE]; 242 } __attribute__ ((__packed__)); 243 244 struct btrfs_chunk { 245 /* size of this chunk in bytes */ 246 __le64 length; 247 248 /* objectid of the root referencing this chunk */ 249 __le64 owner; 250 251 __le64 stripe_len; 252 __le64 type; 253 254 /* optimal io alignment for this chunk */ 255 __le32 io_align; 256 257 /* optimal io width for this chunk */ 258 __le32 io_width; 259 260 /* minimal io size for this chunk */ 261 __le32 sector_size; 262 263 /* 2^16 stripes is quite a lot, a second limit is the size of a single 264 * item in the btree 265 */ 266 __le16 num_stripes; 267 268 /* sub stripes only matter for raid10 */ 269 __le16 sub_stripes; 270 struct btrfs_stripe stripe; 271 /* additional stripes go here */ 272 } __attribute__ ((__packed__)); 273 274 #define BTRFS_FREE_SPACE_EXTENT 1 275 #define BTRFS_FREE_SPACE_BITMAP 2 276 277 struct btrfs_free_space_entry { 278 __le64 offset; 279 __le64 bytes; 280 u8 type; 281 } __attribute__ ((__packed__)); 282 283 struct btrfs_free_space_header { 284 struct btrfs_disk_key location; 285 __le64 generation; 286 __le64 num_entries; 287 __le64 num_bitmaps; 288 } __attribute__ ((__packed__)); 289 290 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 291 { 292 BUG_ON(num_stripes == 0); 293 return sizeof(struct btrfs_chunk) + 294 sizeof(struct btrfs_stripe) * (num_stripes - 1); 295 } 296 297 #define BTRFS_FSID_SIZE 16 298 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) 299 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) 300 301 /* 302 * File system states 303 */ 304 305 /* Errors detected */ 306 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2) 307 308 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) 309 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) 310 311 #define BTRFS_BACKREF_REV_MAX 256 312 #define BTRFS_BACKREF_REV_SHIFT 56 313 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 314 BTRFS_BACKREF_REV_SHIFT) 315 316 #define BTRFS_OLD_BACKREF_REV 0 317 #define BTRFS_MIXED_BACKREF_REV 1 318 319 /* 320 * every tree block (leaf or node) starts with this header. 321 */ 322 struct btrfs_header { 323 /* these first four must match the super block */ 324 u8 csum[BTRFS_CSUM_SIZE]; 325 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 326 __le64 bytenr; /* which block this node is supposed to live in */ 327 __le64 flags; 328 329 /* allowed to be different from the super from here on down */ 330 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 331 __le64 generation; 332 __le64 owner; 333 __le32 nritems; 334 u8 level; 335 } __attribute__ ((__packed__)); 336 337 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ 338 sizeof(struct btrfs_header)) / \ 339 sizeof(struct btrfs_key_ptr)) 340 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) 341 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize)) 342 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 343 sizeof(struct btrfs_item) - \ 344 sizeof(struct btrfs_file_extent_item)) 345 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 346 sizeof(struct btrfs_item) -\ 347 sizeof(struct btrfs_dir_item)) 348 349 350 /* 351 * this is a very generous portion of the super block, giving us 352 * room to translate 14 chunks with 3 stripes each. 353 */ 354 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 355 #define BTRFS_LABEL_SIZE 256 356 357 /* 358 * the super block basically lists the main trees of the FS 359 * it currently lacks any block count etc etc 360 */ 361 struct btrfs_super_block { 362 u8 csum[BTRFS_CSUM_SIZE]; 363 /* the first 4 fields must match struct btrfs_header */ 364 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 365 __le64 bytenr; /* this block number */ 366 __le64 flags; 367 368 /* allowed to be different from the btrfs_header from here own down */ 369 __le64 magic; 370 __le64 generation; 371 __le64 root; 372 __le64 chunk_root; 373 __le64 log_root; 374 375 /* this will help find the new super based on the log root */ 376 __le64 log_root_transid; 377 __le64 total_bytes; 378 __le64 bytes_used; 379 __le64 root_dir_objectid; 380 __le64 num_devices; 381 __le32 sectorsize; 382 __le32 nodesize; 383 __le32 leafsize; 384 __le32 stripesize; 385 __le32 sys_chunk_array_size; 386 __le64 chunk_root_generation; 387 __le64 compat_flags; 388 __le64 compat_ro_flags; 389 __le64 incompat_flags; 390 __le16 csum_type; 391 u8 root_level; 392 u8 chunk_root_level; 393 u8 log_root_level; 394 struct btrfs_dev_item dev_item; 395 396 char label[BTRFS_LABEL_SIZE]; 397 398 __le64 cache_generation; 399 400 /* future expansion */ 401 __le64 reserved[31]; 402 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 403 } __attribute__ ((__packed__)); 404 405 /* 406 * Compat flags that we support. If any incompat flags are set other than the 407 * ones specified below then we will fail to mount 408 */ 409 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0) 410 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1) 411 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2) 412 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3) 413 414 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 415 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL 416 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 417 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 418 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 419 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 420 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO) 421 422 /* 423 * A leaf is full of items. offset and size tell us where to find 424 * the item in the leaf (relative to the start of the data area) 425 */ 426 struct btrfs_item { 427 struct btrfs_disk_key key; 428 __le32 offset; 429 __le32 size; 430 } __attribute__ ((__packed__)); 431 432 /* 433 * leaves have an item area and a data area: 434 * [item0, item1....itemN] [free space] [dataN...data1, data0] 435 * 436 * The data is separate from the items to get the keys closer together 437 * during searches. 438 */ 439 struct btrfs_leaf { 440 struct btrfs_header header; 441 struct btrfs_item items[]; 442 } __attribute__ ((__packed__)); 443 444 /* 445 * all non-leaf blocks are nodes, they hold only keys and pointers to 446 * other blocks 447 */ 448 struct btrfs_key_ptr { 449 struct btrfs_disk_key key; 450 __le64 blockptr; 451 __le64 generation; 452 } __attribute__ ((__packed__)); 453 454 struct btrfs_node { 455 struct btrfs_header header; 456 struct btrfs_key_ptr ptrs[]; 457 } __attribute__ ((__packed__)); 458 459 /* 460 * btrfs_paths remember the path taken from the root down to the leaf. 461 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 462 * to any other levels that are present. 463 * 464 * The slots array records the index of the item or block pointer 465 * used while walking the tree. 466 */ 467 struct btrfs_path { 468 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 469 int slots[BTRFS_MAX_LEVEL]; 470 /* if there is real range locking, this locks field will change */ 471 int locks[BTRFS_MAX_LEVEL]; 472 int reada; 473 /* keep some upper locks as we walk down */ 474 int lowest_level; 475 476 /* 477 * set by btrfs_split_item, tells search_slot to keep all locks 478 * and to force calls to keep space in the nodes 479 */ 480 unsigned int search_for_split:1; 481 unsigned int keep_locks:1; 482 unsigned int skip_locking:1; 483 unsigned int leave_spinning:1; 484 unsigned int search_commit_root:1; 485 }; 486 487 /* 488 * items in the extent btree are used to record the objectid of the 489 * owner of the block and the number of references 490 */ 491 492 struct btrfs_extent_item { 493 __le64 refs; 494 __le64 generation; 495 __le64 flags; 496 } __attribute__ ((__packed__)); 497 498 struct btrfs_extent_item_v0 { 499 __le32 refs; 500 } __attribute__ ((__packed__)); 501 502 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \ 503 sizeof(struct btrfs_item)) 504 505 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0) 506 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1) 507 508 /* following flags only apply to tree blocks */ 509 510 /* use full backrefs for extent pointers in the block */ 511 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8) 512 513 struct btrfs_tree_block_info { 514 struct btrfs_disk_key key; 515 u8 level; 516 } __attribute__ ((__packed__)); 517 518 struct btrfs_extent_data_ref { 519 __le64 root; 520 __le64 objectid; 521 __le64 offset; 522 __le32 count; 523 } __attribute__ ((__packed__)); 524 525 struct btrfs_shared_data_ref { 526 __le32 count; 527 } __attribute__ ((__packed__)); 528 529 struct btrfs_extent_inline_ref { 530 u8 type; 531 __le64 offset; 532 } __attribute__ ((__packed__)); 533 534 /* old style backrefs item */ 535 struct btrfs_extent_ref_v0 { 536 __le64 root; 537 __le64 generation; 538 __le64 objectid; 539 __le32 count; 540 } __attribute__ ((__packed__)); 541 542 543 /* dev extents record free space on individual devices. The owner 544 * field points back to the chunk allocation mapping tree that allocated 545 * the extent. The chunk tree uuid field is a way to double check the owner 546 */ 547 struct btrfs_dev_extent { 548 __le64 chunk_tree; 549 __le64 chunk_objectid; 550 __le64 chunk_offset; 551 __le64 length; 552 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 553 } __attribute__ ((__packed__)); 554 555 struct btrfs_inode_ref { 556 __le64 index; 557 __le16 name_len; 558 /* name goes here */ 559 } __attribute__ ((__packed__)); 560 561 struct btrfs_timespec { 562 __le64 sec; 563 __le32 nsec; 564 } __attribute__ ((__packed__)); 565 566 enum btrfs_compression_type { 567 BTRFS_COMPRESS_NONE = 0, 568 BTRFS_COMPRESS_ZLIB = 1, 569 BTRFS_COMPRESS_LZO = 2, 570 BTRFS_COMPRESS_TYPES = 2, 571 BTRFS_COMPRESS_LAST = 3, 572 }; 573 574 struct btrfs_inode_item { 575 /* nfs style generation number */ 576 __le64 generation; 577 /* transid that last touched this inode */ 578 __le64 transid; 579 __le64 size; 580 __le64 nbytes; 581 __le64 block_group; 582 __le32 nlink; 583 __le32 uid; 584 __le32 gid; 585 __le32 mode; 586 __le64 rdev; 587 __le64 flags; 588 589 /* modification sequence number for NFS */ 590 __le64 sequence; 591 592 /* 593 * a little future expansion, for more than this we can 594 * just grow the inode item and version it 595 */ 596 __le64 reserved[4]; 597 struct btrfs_timespec atime; 598 struct btrfs_timespec ctime; 599 struct btrfs_timespec mtime; 600 struct btrfs_timespec otime; 601 } __attribute__ ((__packed__)); 602 603 struct btrfs_dir_log_item { 604 __le64 end; 605 } __attribute__ ((__packed__)); 606 607 struct btrfs_dir_item { 608 struct btrfs_disk_key location; 609 __le64 transid; 610 __le16 data_len; 611 __le16 name_len; 612 u8 type; 613 } __attribute__ ((__packed__)); 614 615 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0) 616 617 struct btrfs_root_item { 618 struct btrfs_inode_item inode; 619 __le64 generation; 620 __le64 root_dirid; 621 __le64 bytenr; 622 __le64 byte_limit; 623 __le64 bytes_used; 624 __le64 last_snapshot; 625 __le64 flags; 626 __le32 refs; 627 struct btrfs_disk_key drop_progress; 628 u8 drop_level; 629 u8 level; 630 } __attribute__ ((__packed__)); 631 632 /* 633 * this is used for both forward and backward root refs 634 */ 635 struct btrfs_root_ref { 636 __le64 dirid; 637 __le64 sequence; 638 __le16 name_len; 639 } __attribute__ ((__packed__)); 640 641 #define BTRFS_FILE_EXTENT_INLINE 0 642 #define BTRFS_FILE_EXTENT_REG 1 643 #define BTRFS_FILE_EXTENT_PREALLOC 2 644 645 struct btrfs_file_extent_item { 646 /* 647 * transaction id that created this extent 648 */ 649 __le64 generation; 650 /* 651 * max number of bytes to hold this extent in ram 652 * when we split a compressed extent we can't know how big 653 * each of the resulting pieces will be. So, this is 654 * an upper limit on the size of the extent in ram instead of 655 * an exact limit. 656 */ 657 __le64 ram_bytes; 658 659 /* 660 * 32 bits for the various ways we might encode the data, 661 * including compression and encryption. If any of these 662 * are set to something a given disk format doesn't understand 663 * it is treated like an incompat flag for reading and writing, 664 * but not for stat. 665 */ 666 u8 compression; 667 u8 encryption; 668 __le16 other_encoding; /* spare for later use */ 669 670 /* are we inline data or a real extent? */ 671 u8 type; 672 673 /* 674 * disk space consumed by the extent, checksum blocks are included 675 * in these numbers 676 */ 677 __le64 disk_bytenr; 678 __le64 disk_num_bytes; 679 /* 680 * the logical offset in file blocks (no csums) 681 * this extent record is for. This allows a file extent to point 682 * into the middle of an existing extent on disk, sharing it 683 * between two snapshots (useful if some bytes in the middle of the 684 * extent have changed 685 */ 686 __le64 offset; 687 /* 688 * the logical number of file blocks (no csums included). This 689 * always reflects the size uncompressed and without encoding. 690 */ 691 __le64 num_bytes; 692 693 } __attribute__ ((__packed__)); 694 695 struct btrfs_csum_item { 696 u8 csum; 697 } __attribute__ ((__packed__)); 698 699 /* different types of block groups (and chunks) */ 700 #define BTRFS_BLOCK_GROUP_DATA (1 << 0) 701 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1) 702 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2) 703 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3) 704 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4) 705 #define BTRFS_BLOCK_GROUP_DUP (1 << 5) 706 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6) 707 #define BTRFS_NR_RAID_TYPES 5 708 709 struct btrfs_block_group_item { 710 __le64 used; 711 __le64 chunk_objectid; 712 __le64 flags; 713 } __attribute__ ((__packed__)); 714 715 struct btrfs_space_info { 716 u64 flags; 717 718 u64 total_bytes; /* total bytes in the space, 719 this doesn't take mirrors into account */ 720 u64 bytes_used; /* total bytes used, 721 this doesn't take mirrors into account */ 722 u64 bytes_pinned; /* total bytes pinned, will be freed when the 723 transaction finishes */ 724 u64 bytes_reserved; /* total bytes the allocator has reserved for 725 current allocations */ 726 u64 bytes_readonly; /* total bytes that are read only */ 727 728 u64 bytes_may_use; /* number of bytes that may be used for 729 delalloc/allocations */ 730 u64 disk_used; /* total bytes used on disk */ 731 u64 disk_total; /* total bytes on disk, takes mirrors into 732 account */ 733 734 /* 735 * we bump reservation progress every time we decrement 736 * bytes_reserved. This way people waiting for reservations 737 * know something good has happened and they can check 738 * for progress. The number here isn't to be trusted, it 739 * just shows reclaim activity 740 */ 741 unsigned long reservation_progress; 742 743 int full:1; /* indicates that we cannot allocate any more 744 chunks for this space */ 745 int chunk_alloc:1; /* set if we are allocating a chunk */ 746 747 int force_alloc; /* set if we need to force a chunk alloc for 748 this space */ 749 750 struct list_head list; 751 752 /* for block groups in our same type */ 753 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 754 spinlock_t lock; 755 struct rw_semaphore groups_sem; 756 atomic_t caching_threads; 757 }; 758 759 struct btrfs_block_rsv { 760 u64 size; 761 u64 reserved; 762 u64 freed[2]; 763 struct btrfs_space_info *space_info; 764 struct list_head list; 765 spinlock_t lock; 766 atomic_t usage; 767 unsigned int priority:8; 768 unsigned int durable:1; 769 unsigned int refill_used:1; 770 unsigned int full:1; 771 }; 772 773 /* 774 * free clusters are used to claim free space in relatively large chunks, 775 * allowing us to do less seeky writes. They are used for all metadata 776 * allocations and data allocations in ssd mode. 777 */ 778 struct btrfs_free_cluster { 779 spinlock_t lock; 780 spinlock_t refill_lock; 781 struct rb_root root; 782 783 /* largest extent in this cluster */ 784 u64 max_size; 785 786 /* first extent starting offset */ 787 u64 window_start; 788 789 struct btrfs_block_group_cache *block_group; 790 /* 791 * when a cluster is allocated from a block group, we put the 792 * cluster onto a list in the block group so that it can 793 * be freed before the block group is freed. 794 */ 795 struct list_head block_group_list; 796 }; 797 798 enum btrfs_caching_type { 799 BTRFS_CACHE_NO = 0, 800 BTRFS_CACHE_STARTED = 1, 801 BTRFS_CACHE_FINISHED = 2, 802 }; 803 804 enum btrfs_disk_cache_state { 805 BTRFS_DC_WRITTEN = 0, 806 BTRFS_DC_ERROR = 1, 807 BTRFS_DC_CLEAR = 2, 808 BTRFS_DC_SETUP = 3, 809 BTRFS_DC_NEED_WRITE = 4, 810 }; 811 812 struct btrfs_caching_control { 813 struct list_head list; 814 struct mutex mutex; 815 wait_queue_head_t wait; 816 struct btrfs_block_group_cache *block_group; 817 u64 progress; 818 atomic_t count; 819 }; 820 821 struct btrfs_block_group_cache { 822 struct btrfs_key key; 823 struct btrfs_block_group_item item; 824 struct btrfs_fs_info *fs_info; 825 struct inode *inode; 826 spinlock_t lock; 827 u64 pinned; 828 u64 reserved; 829 u64 reserved_pinned; 830 u64 bytes_super; 831 u64 flags; 832 u64 sectorsize; 833 int extents_thresh; 834 int free_extents; 835 int total_bitmaps; 836 unsigned int ro:1; 837 unsigned int dirty:1; 838 unsigned int iref:1; 839 840 int disk_cache_state; 841 842 /* cache tracking stuff */ 843 int cached; 844 struct btrfs_caching_control *caching_ctl; 845 u64 last_byte_to_unpin; 846 847 struct btrfs_space_info *space_info; 848 849 /* free space cache stuff */ 850 spinlock_t tree_lock; 851 struct rb_root free_space_offset; 852 u64 free_space; 853 854 /* block group cache stuff */ 855 struct rb_node cache_node; 856 857 /* for block groups in the same raid type */ 858 struct list_head list; 859 860 /* usage count */ 861 atomic_t count; 862 863 /* List of struct btrfs_free_clusters for this block group. 864 * Today it will only have one thing on it, but that may change 865 */ 866 struct list_head cluster_list; 867 }; 868 869 struct reloc_control; 870 struct btrfs_device; 871 struct btrfs_fs_devices; 872 struct btrfs_fs_info { 873 u8 fsid[BTRFS_FSID_SIZE]; 874 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 875 struct btrfs_root *extent_root; 876 struct btrfs_root *tree_root; 877 struct btrfs_root *chunk_root; 878 struct btrfs_root *dev_root; 879 struct btrfs_root *fs_root; 880 struct btrfs_root *csum_root; 881 882 /* the log root tree is a directory of all the other log roots */ 883 struct btrfs_root *log_root_tree; 884 885 spinlock_t fs_roots_radix_lock; 886 struct radix_tree_root fs_roots_radix; 887 888 /* block group cache stuff */ 889 spinlock_t block_group_cache_lock; 890 struct rb_root block_group_cache_tree; 891 892 struct extent_io_tree freed_extents[2]; 893 struct extent_io_tree *pinned_extents; 894 895 /* logical->physical extent mapping */ 896 struct btrfs_mapping_tree mapping_tree; 897 898 /* block reservation for extent, checksum and root tree */ 899 struct btrfs_block_rsv global_block_rsv; 900 /* block reservation for delay allocation */ 901 struct btrfs_block_rsv delalloc_block_rsv; 902 /* block reservation for metadata operations */ 903 struct btrfs_block_rsv trans_block_rsv; 904 /* block reservation for chunk tree */ 905 struct btrfs_block_rsv chunk_block_rsv; 906 907 struct btrfs_block_rsv empty_block_rsv; 908 909 /* list of block reservations that cross multiple transactions */ 910 struct list_head durable_block_rsv_list; 911 912 struct mutex durable_block_rsv_mutex; 913 914 u64 generation; 915 u64 last_trans_committed; 916 917 /* 918 * this is updated to the current trans every time a full commit 919 * is required instead of the faster short fsync log commits 920 */ 921 u64 last_trans_log_full_commit; 922 u64 open_ioctl_trans; 923 unsigned long mount_opt:20; 924 unsigned long compress_type:4; 925 u64 max_inline; 926 u64 alloc_start; 927 struct btrfs_transaction *running_transaction; 928 wait_queue_head_t transaction_throttle; 929 wait_queue_head_t transaction_wait; 930 wait_queue_head_t transaction_blocked_wait; 931 wait_queue_head_t async_submit_wait; 932 933 struct btrfs_super_block super_copy; 934 struct btrfs_super_block super_for_commit; 935 struct block_device *__bdev; 936 struct super_block *sb; 937 struct inode *btree_inode; 938 struct backing_dev_info bdi; 939 struct mutex trans_mutex; 940 struct mutex tree_log_mutex; 941 struct mutex transaction_kthread_mutex; 942 struct mutex cleaner_mutex; 943 struct mutex chunk_mutex; 944 struct mutex volume_mutex; 945 /* 946 * this protects the ordered operations list only while we are 947 * processing all of the entries on it. This way we make 948 * sure the commit code doesn't find the list temporarily empty 949 * because another function happens to be doing non-waiting preflush 950 * before jumping into the main commit. 951 */ 952 struct mutex ordered_operations_mutex; 953 struct rw_semaphore extent_commit_sem; 954 955 struct rw_semaphore cleanup_work_sem; 956 957 struct rw_semaphore subvol_sem; 958 struct srcu_struct subvol_srcu; 959 960 struct list_head trans_list; 961 struct list_head hashers; 962 struct list_head dead_roots; 963 struct list_head caching_block_groups; 964 965 spinlock_t delayed_iput_lock; 966 struct list_head delayed_iputs; 967 968 atomic_t nr_async_submits; 969 atomic_t async_submit_draining; 970 atomic_t nr_async_bios; 971 atomic_t async_delalloc_pages; 972 973 /* 974 * this is used by the balancing code to wait for all the pending 975 * ordered extents 976 */ 977 spinlock_t ordered_extent_lock; 978 979 /* 980 * all of the data=ordered extents pending writeback 981 * these can span multiple transactions and basically include 982 * every dirty data page that isn't from nodatacow 983 */ 984 struct list_head ordered_extents; 985 986 /* 987 * all of the inodes that have delalloc bytes. It is possible for 988 * this list to be empty even when there is still dirty data=ordered 989 * extents waiting to finish IO. 990 */ 991 struct list_head delalloc_inodes; 992 993 /* 994 * special rename and truncate targets that must be on disk before 995 * we're allowed to commit. This is basically the ext3 style 996 * data=ordered list. 997 */ 998 struct list_head ordered_operations; 999 1000 /* 1001 * there is a pool of worker threads for checksumming during writes 1002 * and a pool for checksumming after reads. This is because readers 1003 * can run with FS locks held, and the writers may be waiting for 1004 * those locks. We don't want ordering in the pending list to cause 1005 * deadlocks, and so the two are serviced separately. 1006 * 1007 * A third pool does submit_bio to avoid deadlocking with the other 1008 * two 1009 */ 1010 struct btrfs_workers generic_worker; 1011 struct btrfs_workers workers; 1012 struct btrfs_workers delalloc_workers; 1013 struct btrfs_workers endio_workers; 1014 struct btrfs_workers endio_meta_workers; 1015 struct btrfs_workers endio_meta_write_workers; 1016 struct btrfs_workers endio_write_workers; 1017 struct btrfs_workers endio_freespace_worker; 1018 struct btrfs_workers submit_workers; 1019 /* 1020 * fixup workers take dirty pages that didn't properly go through 1021 * the cow mechanism and make them safe to write. It happens 1022 * for the sys_munmap function call path 1023 */ 1024 struct btrfs_workers fixup_workers; 1025 struct task_struct *transaction_kthread; 1026 struct task_struct *cleaner_kthread; 1027 int thread_pool_size; 1028 1029 struct kobject super_kobj; 1030 struct completion kobj_unregister; 1031 int do_barriers; 1032 int closing; 1033 int log_root_recovering; 1034 int enospc_unlink; 1035 1036 u64 total_pinned; 1037 1038 /* protected by the delalloc lock, used to keep from writing 1039 * metadata until there is a nice batch 1040 */ 1041 u64 dirty_metadata_bytes; 1042 struct list_head dirty_cowonly_roots; 1043 1044 struct btrfs_fs_devices *fs_devices; 1045 1046 /* 1047 * the space_info list is almost entirely read only. It only changes 1048 * when we add a new raid type to the FS, and that happens 1049 * very rarely. RCU is used to protect it. 1050 */ 1051 struct list_head space_info; 1052 1053 struct reloc_control *reloc_ctl; 1054 1055 spinlock_t delalloc_lock; 1056 spinlock_t new_trans_lock; 1057 u64 delalloc_bytes; 1058 1059 /* data_alloc_cluster is only used in ssd mode */ 1060 struct btrfs_free_cluster data_alloc_cluster; 1061 1062 /* all metadata allocations go through this cluster */ 1063 struct btrfs_free_cluster meta_alloc_cluster; 1064 1065 spinlock_t ref_cache_lock; 1066 u64 total_ref_cache_size; 1067 1068 u64 avail_data_alloc_bits; 1069 u64 avail_metadata_alloc_bits; 1070 u64 avail_system_alloc_bits; 1071 u64 data_alloc_profile; 1072 u64 metadata_alloc_profile; 1073 u64 system_alloc_profile; 1074 1075 unsigned data_chunk_allocations; 1076 unsigned metadata_ratio; 1077 1078 void *bdev_holder; 1079 1080 /* filesystem state */ 1081 u64 fs_state; 1082 }; 1083 1084 /* 1085 * in ram representation of the tree. extent_root is used for all allocations 1086 * and for the extent tree extent_root root. 1087 */ 1088 struct btrfs_root { 1089 struct extent_buffer *node; 1090 1091 /* the node lock is held while changing the node pointer */ 1092 spinlock_t node_lock; 1093 1094 struct extent_buffer *commit_root; 1095 struct btrfs_root *log_root; 1096 struct btrfs_root *reloc_root; 1097 1098 struct btrfs_root_item root_item; 1099 struct btrfs_key root_key; 1100 struct btrfs_fs_info *fs_info; 1101 struct extent_io_tree dirty_log_pages; 1102 1103 struct kobject root_kobj; 1104 struct completion kobj_unregister; 1105 struct mutex objectid_mutex; 1106 1107 spinlock_t accounting_lock; 1108 struct btrfs_block_rsv *block_rsv; 1109 1110 struct mutex log_mutex; 1111 wait_queue_head_t log_writer_wait; 1112 wait_queue_head_t log_commit_wait[2]; 1113 atomic_t log_writers; 1114 atomic_t log_commit[2]; 1115 unsigned long log_transid; 1116 unsigned long last_log_commit; 1117 unsigned long log_batch; 1118 pid_t log_start_pid; 1119 bool log_multiple_pids; 1120 1121 u64 objectid; 1122 u64 last_trans; 1123 1124 /* data allocations are done in sectorsize units */ 1125 u32 sectorsize; 1126 1127 /* node allocations are done in nodesize units */ 1128 u32 nodesize; 1129 1130 /* leaf allocations are done in leafsize units */ 1131 u32 leafsize; 1132 1133 u32 stripesize; 1134 1135 u32 type; 1136 1137 u64 highest_objectid; 1138 int ref_cows; 1139 int track_dirty; 1140 int in_radix; 1141 1142 u64 defrag_trans_start; 1143 struct btrfs_key defrag_progress; 1144 struct btrfs_key defrag_max; 1145 int defrag_running; 1146 char *name; 1147 int in_sysfs; 1148 1149 /* the dirty list is only used by non-reference counted roots */ 1150 struct list_head dirty_list; 1151 1152 struct list_head root_list; 1153 1154 spinlock_t orphan_lock; 1155 struct list_head orphan_list; 1156 struct btrfs_block_rsv *orphan_block_rsv; 1157 int orphan_item_inserted; 1158 int orphan_cleanup_state; 1159 1160 spinlock_t inode_lock; 1161 /* red-black tree that keeps track of in-memory inodes */ 1162 struct rb_root inode_tree; 1163 1164 /* 1165 * right now this just gets used so that a root has its own devid 1166 * for stat. It may be used for more later 1167 */ 1168 struct super_block anon_super; 1169 }; 1170 1171 /* 1172 * inode items have the data typically returned from stat and store other 1173 * info about object characteristics. There is one for every file and dir in 1174 * the FS 1175 */ 1176 #define BTRFS_INODE_ITEM_KEY 1 1177 #define BTRFS_INODE_REF_KEY 12 1178 #define BTRFS_XATTR_ITEM_KEY 24 1179 #define BTRFS_ORPHAN_ITEM_KEY 48 1180 /* reserve 2-15 close to the inode for later flexibility */ 1181 1182 /* 1183 * dir items are the name -> inode pointers in a directory. There is one 1184 * for every name in a directory. 1185 */ 1186 #define BTRFS_DIR_LOG_ITEM_KEY 60 1187 #define BTRFS_DIR_LOG_INDEX_KEY 72 1188 #define BTRFS_DIR_ITEM_KEY 84 1189 #define BTRFS_DIR_INDEX_KEY 96 1190 /* 1191 * extent data is for file data 1192 */ 1193 #define BTRFS_EXTENT_DATA_KEY 108 1194 1195 /* 1196 * extent csums are stored in a separate tree and hold csums for 1197 * an entire extent on disk. 1198 */ 1199 #define BTRFS_EXTENT_CSUM_KEY 128 1200 1201 /* 1202 * root items point to tree roots. They are typically in the root 1203 * tree used by the super block to find all the other trees 1204 */ 1205 #define BTRFS_ROOT_ITEM_KEY 132 1206 1207 /* 1208 * root backrefs tie subvols and snapshots to the directory entries that 1209 * reference them 1210 */ 1211 #define BTRFS_ROOT_BACKREF_KEY 144 1212 1213 /* 1214 * root refs make a fast index for listing all of the snapshots and 1215 * subvolumes referenced by a given root. They point directly to the 1216 * directory item in the root that references the subvol 1217 */ 1218 #define BTRFS_ROOT_REF_KEY 156 1219 1220 /* 1221 * extent items are in the extent map tree. These record which blocks 1222 * are used, and how many references there are to each block 1223 */ 1224 #define BTRFS_EXTENT_ITEM_KEY 168 1225 1226 #define BTRFS_TREE_BLOCK_REF_KEY 176 1227 1228 #define BTRFS_EXTENT_DATA_REF_KEY 178 1229 1230 #define BTRFS_EXTENT_REF_V0_KEY 180 1231 1232 #define BTRFS_SHARED_BLOCK_REF_KEY 182 1233 1234 #define BTRFS_SHARED_DATA_REF_KEY 184 1235 1236 /* 1237 * block groups give us hints into the extent allocation trees. Which 1238 * blocks are free etc etc 1239 */ 1240 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 1241 1242 #define BTRFS_DEV_EXTENT_KEY 204 1243 #define BTRFS_DEV_ITEM_KEY 216 1244 #define BTRFS_CHUNK_ITEM_KEY 228 1245 1246 /* 1247 * string items are for debugging. They just store a short string of 1248 * data in the FS 1249 */ 1250 #define BTRFS_STRING_ITEM_KEY 253 1251 1252 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1253 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1254 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1255 #define BTRFS_MOUNT_SSD (1 << 3) 1256 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1257 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1258 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1259 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1260 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1261 #define BTRFS_MOUNT_NOSSD (1 << 9) 1262 #define BTRFS_MOUNT_DISCARD (1 << 10) 1263 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1264 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1265 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1266 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1267 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1268 1269 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1270 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1271 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1272 BTRFS_MOUNT_##opt) 1273 /* 1274 * Inode flags 1275 */ 1276 #define BTRFS_INODE_NODATASUM (1 << 0) 1277 #define BTRFS_INODE_NODATACOW (1 << 1) 1278 #define BTRFS_INODE_READONLY (1 << 2) 1279 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1280 #define BTRFS_INODE_PREALLOC (1 << 4) 1281 #define BTRFS_INODE_SYNC (1 << 5) 1282 #define BTRFS_INODE_IMMUTABLE (1 << 6) 1283 #define BTRFS_INODE_APPEND (1 << 7) 1284 #define BTRFS_INODE_NODUMP (1 << 8) 1285 #define BTRFS_INODE_NOATIME (1 << 9) 1286 #define BTRFS_INODE_DIRSYNC (1 << 10) 1287 #define BTRFS_INODE_COMPRESS (1 << 11) 1288 1289 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 1290 1291 /* some macros to generate set/get funcs for the struct fields. This 1292 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1293 * one for u8: 1294 */ 1295 #define le8_to_cpu(v) (v) 1296 #define cpu_to_le8(v) (v) 1297 #define __le8 u8 1298 1299 #define read_eb_member(eb, ptr, type, member, result) ( \ 1300 read_extent_buffer(eb, (char *)(result), \ 1301 ((unsigned long)(ptr)) + \ 1302 offsetof(type, member), \ 1303 sizeof(((type *)0)->member))) 1304 1305 #define write_eb_member(eb, ptr, type, member, result) ( \ 1306 write_extent_buffer(eb, (char *)(result), \ 1307 ((unsigned long)(ptr)) + \ 1308 offsetof(type, member), \ 1309 sizeof(((type *)0)->member))) 1310 1311 #ifndef BTRFS_SETGET_FUNCS 1312 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1313 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ 1314 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); 1315 #endif 1316 1317 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1318 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1319 { \ 1320 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1321 u##bits res = le##bits##_to_cpu(p->member); \ 1322 kunmap_atomic(p, KM_USER0); \ 1323 return res; \ 1324 } \ 1325 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1326 u##bits val) \ 1327 { \ 1328 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1329 p->member = cpu_to_le##bits(val); \ 1330 kunmap_atomic(p, KM_USER0); \ 1331 } 1332 1333 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1334 static inline u##bits btrfs_##name(type *s) \ 1335 { \ 1336 return le##bits##_to_cpu(s->member); \ 1337 } \ 1338 static inline void btrfs_set_##name(type *s, u##bits val) \ 1339 { \ 1340 s->member = cpu_to_le##bits(val); \ 1341 } 1342 1343 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1344 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1345 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1346 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1347 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1348 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1349 start_offset, 64); 1350 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1351 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1352 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1353 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1354 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1355 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1356 1357 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1358 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1359 total_bytes, 64); 1360 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1361 bytes_used, 64); 1362 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1363 io_align, 32); 1364 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1365 io_width, 32); 1366 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1367 sector_size, 32); 1368 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1369 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1370 dev_group, 32); 1371 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1372 seek_speed, 8); 1373 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1374 bandwidth, 8); 1375 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1376 generation, 64); 1377 1378 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d) 1379 { 1380 return (char *)d + offsetof(struct btrfs_dev_item, uuid); 1381 } 1382 1383 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d) 1384 { 1385 return (char *)d + offsetof(struct btrfs_dev_item, fsid); 1386 } 1387 1388 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1389 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1390 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1391 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1392 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1393 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1394 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1395 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1396 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1397 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1398 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1399 1400 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1401 { 1402 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1403 } 1404 1405 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1406 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1407 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1408 stripe_len, 64); 1409 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1410 io_align, 32); 1411 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1412 io_width, 32); 1413 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1414 sector_size, 32); 1415 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1416 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1417 num_stripes, 16); 1418 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1419 sub_stripes, 16); 1420 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1421 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1422 1423 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1424 int nr) 1425 { 1426 unsigned long offset = (unsigned long)c; 1427 offset += offsetof(struct btrfs_chunk, stripe); 1428 offset += nr * sizeof(struct btrfs_stripe); 1429 return (struct btrfs_stripe *)offset; 1430 } 1431 1432 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1433 { 1434 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1435 } 1436 1437 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1438 struct btrfs_chunk *c, int nr) 1439 { 1440 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1441 } 1442 1443 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb, 1444 struct btrfs_chunk *c, int nr, 1445 u64 val) 1446 { 1447 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val); 1448 } 1449 1450 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1451 struct btrfs_chunk *c, int nr) 1452 { 1453 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1454 } 1455 1456 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb, 1457 struct btrfs_chunk *c, int nr, 1458 u64 val) 1459 { 1460 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val); 1461 } 1462 1463 /* struct btrfs_block_group_item */ 1464 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1465 used, 64); 1466 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1467 used, 64); 1468 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1469 struct btrfs_block_group_item, chunk_objectid, 64); 1470 1471 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1472 struct btrfs_block_group_item, chunk_objectid, 64); 1473 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1474 struct btrfs_block_group_item, flags, 64); 1475 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1476 struct btrfs_block_group_item, flags, 64); 1477 1478 /* struct btrfs_inode_ref */ 1479 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1480 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1481 1482 /* struct btrfs_inode_item */ 1483 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1484 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1485 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1486 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1487 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1488 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1489 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1490 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1491 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1492 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1493 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1494 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1495 1496 static inline struct btrfs_timespec * 1497 btrfs_inode_atime(struct btrfs_inode_item *inode_item) 1498 { 1499 unsigned long ptr = (unsigned long)inode_item; 1500 ptr += offsetof(struct btrfs_inode_item, atime); 1501 return (struct btrfs_timespec *)ptr; 1502 } 1503 1504 static inline struct btrfs_timespec * 1505 btrfs_inode_mtime(struct btrfs_inode_item *inode_item) 1506 { 1507 unsigned long ptr = (unsigned long)inode_item; 1508 ptr += offsetof(struct btrfs_inode_item, mtime); 1509 return (struct btrfs_timespec *)ptr; 1510 } 1511 1512 static inline struct btrfs_timespec * 1513 btrfs_inode_ctime(struct btrfs_inode_item *inode_item) 1514 { 1515 unsigned long ptr = (unsigned long)inode_item; 1516 ptr += offsetof(struct btrfs_inode_item, ctime); 1517 return (struct btrfs_timespec *)ptr; 1518 } 1519 1520 static inline struct btrfs_timespec * 1521 btrfs_inode_otime(struct btrfs_inode_item *inode_item) 1522 { 1523 unsigned long ptr = (unsigned long)inode_item; 1524 ptr += offsetof(struct btrfs_inode_item, otime); 1525 return (struct btrfs_timespec *)ptr; 1526 } 1527 1528 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1529 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1530 1531 /* struct btrfs_dev_extent */ 1532 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1533 chunk_tree, 64); 1534 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1535 chunk_objectid, 64); 1536 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1537 chunk_offset, 64); 1538 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1539 1540 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1541 { 1542 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1543 return (u8 *)((unsigned long)dev + ptr); 1544 } 1545 1546 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 1547 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 1548 generation, 64); 1549 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 1550 1551 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); 1552 1553 1554 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 1555 1556 static inline void btrfs_tree_block_key(struct extent_buffer *eb, 1557 struct btrfs_tree_block_info *item, 1558 struct btrfs_disk_key *key) 1559 { 1560 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1561 } 1562 1563 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, 1564 struct btrfs_tree_block_info *item, 1565 struct btrfs_disk_key *key) 1566 { 1567 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 1568 } 1569 1570 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 1571 root, 64); 1572 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 1573 objectid, 64); 1574 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 1575 offset, 64); 1576 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 1577 count, 32); 1578 1579 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 1580 count, 32); 1581 1582 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 1583 type, 8); 1584 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 1585 offset, 64); 1586 1587 static inline u32 btrfs_extent_inline_ref_size(int type) 1588 { 1589 if (type == BTRFS_TREE_BLOCK_REF_KEY || 1590 type == BTRFS_SHARED_BLOCK_REF_KEY) 1591 return sizeof(struct btrfs_extent_inline_ref); 1592 if (type == BTRFS_SHARED_DATA_REF_KEY) 1593 return sizeof(struct btrfs_shared_data_ref) + 1594 sizeof(struct btrfs_extent_inline_ref); 1595 if (type == BTRFS_EXTENT_DATA_REF_KEY) 1596 return sizeof(struct btrfs_extent_data_ref) + 1597 offsetof(struct btrfs_extent_inline_ref, offset); 1598 BUG(); 1599 return 0; 1600 } 1601 1602 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); 1603 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, 1604 generation, 64); 1605 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); 1606 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32); 1607 1608 /* struct btrfs_node */ 1609 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1610 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1611 1612 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1613 { 1614 unsigned long ptr; 1615 ptr = offsetof(struct btrfs_node, ptrs) + 1616 sizeof(struct btrfs_key_ptr) * nr; 1617 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1618 } 1619 1620 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1621 int nr, u64 val) 1622 { 1623 unsigned long ptr; 1624 ptr = offsetof(struct btrfs_node, ptrs) + 1625 sizeof(struct btrfs_key_ptr) * nr; 1626 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1627 } 1628 1629 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1630 { 1631 unsigned long ptr; 1632 ptr = offsetof(struct btrfs_node, ptrs) + 1633 sizeof(struct btrfs_key_ptr) * nr; 1634 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1635 } 1636 1637 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1638 int nr, u64 val) 1639 { 1640 unsigned long ptr; 1641 ptr = offsetof(struct btrfs_node, ptrs) + 1642 sizeof(struct btrfs_key_ptr) * nr; 1643 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1644 } 1645 1646 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1647 { 1648 return offsetof(struct btrfs_node, ptrs) + 1649 sizeof(struct btrfs_key_ptr) * nr; 1650 } 1651 1652 void btrfs_node_key(struct extent_buffer *eb, 1653 struct btrfs_disk_key *disk_key, int nr); 1654 1655 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1656 struct btrfs_disk_key *disk_key, int nr) 1657 { 1658 unsigned long ptr; 1659 ptr = btrfs_node_key_ptr_offset(nr); 1660 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1661 struct btrfs_key_ptr, key, disk_key); 1662 } 1663 1664 /* struct btrfs_item */ 1665 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1666 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1667 1668 static inline unsigned long btrfs_item_nr_offset(int nr) 1669 { 1670 return offsetof(struct btrfs_leaf, items) + 1671 sizeof(struct btrfs_item) * nr; 1672 } 1673 1674 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, 1675 int nr) 1676 { 1677 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1678 } 1679 1680 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1681 struct btrfs_item *item) 1682 { 1683 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1684 } 1685 1686 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1687 { 1688 return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); 1689 } 1690 1691 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1692 { 1693 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); 1694 } 1695 1696 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1697 { 1698 return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); 1699 } 1700 1701 static inline void btrfs_item_key(struct extent_buffer *eb, 1702 struct btrfs_disk_key *disk_key, int nr) 1703 { 1704 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1705 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1706 } 1707 1708 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1709 struct btrfs_disk_key *disk_key, int nr) 1710 { 1711 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1712 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1713 } 1714 1715 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1716 1717 /* 1718 * struct btrfs_root_ref 1719 */ 1720 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1721 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1722 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1723 1724 /* struct btrfs_dir_item */ 1725 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1726 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1727 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1728 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1729 1730 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1731 struct btrfs_dir_item *item, 1732 struct btrfs_disk_key *key) 1733 { 1734 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1735 } 1736 1737 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1738 struct btrfs_dir_item *item, 1739 struct btrfs_disk_key *key) 1740 { 1741 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1742 } 1743 1744 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 1745 num_entries, 64); 1746 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 1747 num_bitmaps, 64); 1748 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 1749 generation, 64); 1750 1751 static inline void btrfs_free_space_key(struct extent_buffer *eb, 1752 struct btrfs_free_space_header *h, 1753 struct btrfs_disk_key *key) 1754 { 1755 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1756 } 1757 1758 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 1759 struct btrfs_free_space_header *h, 1760 struct btrfs_disk_key *key) 1761 { 1762 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 1763 } 1764 1765 /* struct btrfs_disk_key */ 1766 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1767 objectid, 64); 1768 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1769 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1770 1771 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1772 struct btrfs_disk_key *disk) 1773 { 1774 cpu->offset = le64_to_cpu(disk->offset); 1775 cpu->type = disk->type; 1776 cpu->objectid = le64_to_cpu(disk->objectid); 1777 } 1778 1779 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1780 struct btrfs_key *cpu) 1781 { 1782 disk->offset = cpu_to_le64(cpu->offset); 1783 disk->type = cpu->type; 1784 disk->objectid = cpu_to_le64(cpu->objectid); 1785 } 1786 1787 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1788 struct btrfs_key *key, int nr) 1789 { 1790 struct btrfs_disk_key disk_key; 1791 btrfs_node_key(eb, &disk_key, nr); 1792 btrfs_disk_key_to_cpu(key, &disk_key); 1793 } 1794 1795 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1796 struct btrfs_key *key, int nr) 1797 { 1798 struct btrfs_disk_key disk_key; 1799 btrfs_item_key(eb, &disk_key, nr); 1800 btrfs_disk_key_to_cpu(key, &disk_key); 1801 } 1802 1803 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1804 struct btrfs_dir_item *item, 1805 struct btrfs_key *key) 1806 { 1807 struct btrfs_disk_key disk_key; 1808 btrfs_dir_item_key(eb, item, &disk_key); 1809 btrfs_disk_key_to_cpu(key, &disk_key); 1810 } 1811 1812 1813 static inline u8 btrfs_key_type(struct btrfs_key *key) 1814 { 1815 return key->type; 1816 } 1817 1818 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1819 { 1820 key->type = val; 1821 } 1822 1823 /* struct btrfs_header */ 1824 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1825 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1826 generation, 64); 1827 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1828 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1829 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1830 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1831 1832 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1833 { 1834 return (btrfs_header_flags(eb) & flag) == flag; 1835 } 1836 1837 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1838 { 1839 u64 flags = btrfs_header_flags(eb); 1840 btrfs_set_header_flags(eb, flags | flag); 1841 return (flags & flag) == flag; 1842 } 1843 1844 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 1845 { 1846 u64 flags = btrfs_header_flags(eb); 1847 btrfs_set_header_flags(eb, flags & ~flag); 1848 return (flags & flag) == flag; 1849 } 1850 1851 static inline int btrfs_header_backref_rev(struct extent_buffer *eb) 1852 { 1853 u64 flags = btrfs_header_flags(eb); 1854 return flags >> BTRFS_BACKREF_REV_SHIFT; 1855 } 1856 1857 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 1858 int rev) 1859 { 1860 u64 flags = btrfs_header_flags(eb); 1861 flags &= ~BTRFS_BACKREF_REV_MASK; 1862 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 1863 btrfs_set_header_flags(eb, flags); 1864 } 1865 1866 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb) 1867 { 1868 unsigned long ptr = offsetof(struct btrfs_header, fsid); 1869 return (u8 *)ptr; 1870 } 1871 1872 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 1873 { 1874 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid); 1875 return (u8 *)ptr; 1876 } 1877 1878 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb) 1879 { 1880 unsigned long ptr = offsetof(struct btrfs_super_block, fsid); 1881 return (u8 *)ptr; 1882 } 1883 1884 static inline u8 *btrfs_header_csum(struct extent_buffer *eb) 1885 { 1886 unsigned long ptr = offsetof(struct btrfs_header, csum); 1887 return (u8 *)ptr; 1888 } 1889 1890 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb) 1891 { 1892 return NULL; 1893 } 1894 1895 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb) 1896 { 1897 return NULL; 1898 } 1899 1900 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb) 1901 { 1902 return NULL; 1903 } 1904 1905 static inline int btrfs_is_leaf(struct extent_buffer *eb) 1906 { 1907 return btrfs_header_level(eb) == 0; 1908 } 1909 1910 /* struct btrfs_root_item */ 1911 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 1912 generation, 64); 1913 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 1914 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 1915 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 1916 1917 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 1918 generation, 64); 1919 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 1920 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 1921 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 1922 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 1923 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 1924 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 1925 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 1926 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 1927 last_snapshot, 64); 1928 1929 static inline bool btrfs_root_readonly(struct btrfs_root *root) 1930 { 1931 return root->root_item.flags & BTRFS_ROOT_SUBVOL_RDONLY; 1932 } 1933 1934 /* struct btrfs_super_block */ 1935 1936 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 1937 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 1938 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 1939 generation, 64); 1940 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 1941 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 1942 struct btrfs_super_block, sys_chunk_array_size, 32); 1943 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 1944 struct btrfs_super_block, chunk_root_generation, 64); 1945 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 1946 root_level, 8); 1947 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 1948 chunk_root, 64); 1949 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 1950 chunk_root_level, 8); 1951 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 1952 log_root, 64); 1953 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 1954 log_root_transid, 64); 1955 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 1956 log_root_level, 8); 1957 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 1958 total_bytes, 64); 1959 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 1960 bytes_used, 64); 1961 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 1962 sectorsize, 32); 1963 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 1964 nodesize, 32); 1965 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, 1966 leafsize, 32); 1967 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 1968 stripesize, 32); 1969 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 1970 root_dir_objectid, 64); 1971 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 1972 num_devices, 64); 1973 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 1974 compat_flags, 64); 1975 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 1976 compat_ro_flags, 64); 1977 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 1978 incompat_flags, 64); 1979 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 1980 csum_type, 16); 1981 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 1982 cache_generation, 64); 1983 1984 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 1985 { 1986 int t = btrfs_super_csum_type(s); 1987 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes)); 1988 return btrfs_csum_sizes[t]; 1989 } 1990 1991 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 1992 { 1993 return offsetof(struct btrfs_leaf, items); 1994 } 1995 1996 /* struct btrfs_file_extent_item */ 1997 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 1998 1999 static inline unsigned long 2000 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 2001 { 2002 unsigned long offset = (unsigned long)e; 2003 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); 2004 return offset; 2005 } 2006 2007 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2008 { 2009 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; 2010 } 2011 2012 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2013 disk_bytenr, 64); 2014 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2015 generation, 64); 2016 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2017 disk_num_bytes, 64); 2018 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2019 offset, 64); 2020 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2021 num_bytes, 64); 2022 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2023 ram_bytes, 64); 2024 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2025 compression, 8); 2026 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2027 encryption, 8); 2028 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2029 other_encoding, 16); 2030 2031 /* this returns the number of file bytes represented by the inline item. 2032 * If an item is compressed, this is the uncompressed size 2033 */ 2034 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 2035 struct btrfs_file_extent_item *e) 2036 { 2037 return btrfs_file_extent_ram_bytes(eb, e); 2038 } 2039 2040 /* 2041 * this returns the number of bytes used by the item on disk, minus the 2042 * size of any extent headers. If a file is compressed on disk, this is 2043 * the compressed size 2044 */ 2045 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 2046 struct btrfs_item *e) 2047 { 2048 unsigned long offset; 2049 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); 2050 return btrfs_item_size(eb, e) - offset; 2051 } 2052 2053 static inline struct btrfs_root *btrfs_sb(struct super_block *sb) 2054 { 2055 return sb->s_fs_info; 2056 } 2057 2058 static inline int btrfs_set_root_name(struct btrfs_root *root, 2059 const char *name, int len) 2060 { 2061 /* if we already have a name just free it */ 2062 kfree(root->name); 2063 2064 root->name = kmalloc(len+1, GFP_KERNEL); 2065 if (!root->name) 2066 return -ENOMEM; 2067 2068 memcpy(root->name, name, len); 2069 root->name[len] = '\0'; 2070 2071 return 0; 2072 } 2073 2074 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) 2075 { 2076 if (level == 0) 2077 return root->leafsize; 2078 return root->nodesize; 2079 } 2080 2081 /* helper function to cast into the data area of the leaf. */ 2082 #define btrfs_item_ptr(leaf, slot, type) \ 2083 ((type *)(btrfs_leaf_data(leaf) + \ 2084 btrfs_item_offset_nr(leaf, slot))) 2085 2086 #define btrfs_item_ptr_offset(leaf, slot) \ 2087 ((unsigned long)(btrfs_leaf_data(leaf) + \ 2088 btrfs_item_offset_nr(leaf, slot))) 2089 2090 static inline struct dentry *fdentry(struct file *file) 2091 { 2092 return file->f_path.dentry; 2093 } 2094 2095 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 2096 { 2097 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 2098 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 2099 } 2100 2101 /* extent-tree.c */ 2102 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2103 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 2104 struct btrfs_root *root, unsigned long count); 2105 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); 2106 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 2107 struct btrfs_root *root, u64 bytenr, 2108 u64 num_bytes, u64 *refs, u64 *flags); 2109 int btrfs_pin_extent(struct btrfs_root *root, 2110 u64 bytenr, u64 num, int reserved); 2111 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, 2112 struct btrfs_root *root, struct extent_buffer *leaf); 2113 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 2114 struct btrfs_root *root, 2115 u64 objectid, u64 offset, u64 bytenr); 2116 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy); 2117 struct btrfs_block_group_cache *btrfs_lookup_block_group( 2118 struct btrfs_fs_info *info, 2119 u64 bytenr); 2120 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 2121 u64 btrfs_find_block_group(struct btrfs_root *root, 2122 u64 search_start, u64 search_hint, int owner); 2123 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, 2124 struct btrfs_root *root, u32 blocksize, 2125 u64 parent, u64 root_objectid, 2126 struct btrfs_disk_key *key, int level, 2127 u64 hint, u64 empty_size); 2128 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 2129 struct btrfs_root *root, 2130 struct extent_buffer *buf, 2131 u64 parent, int last_ref); 2132 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, 2133 struct btrfs_root *root, 2134 u64 bytenr, u32 blocksize, 2135 int level); 2136 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 2137 struct btrfs_root *root, 2138 u64 root_objectid, u64 owner, 2139 u64 offset, struct btrfs_key *ins); 2140 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 2141 struct btrfs_root *root, 2142 u64 root_objectid, u64 owner, u64 offset, 2143 struct btrfs_key *ins); 2144 int btrfs_reserve_extent(struct btrfs_trans_handle *trans, 2145 struct btrfs_root *root, 2146 u64 num_bytes, u64 min_alloc_size, 2147 u64 empty_size, u64 hint_byte, 2148 u64 search_end, struct btrfs_key *ins, 2149 u64 data); 2150 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2151 struct extent_buffer *buf, int full_backref); 2152 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2153 struct extent_buffer *buf, int full_backref); 2154 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 2155 struct btrfs_root *root, 2156 u64 bytenr, u64 num_bytes, u64 flags, 2157 int is_data); 2158 int btrfs_free_extent(struct btrfs_trans_handle *trans, 2159 struct btrfs_root *root, 2160 u64 bytenr, u64 num_bytes, u64 parent, 2161 u64 root_objectid, u64 owner, u64 offset); 2162 2163 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 2164 int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache, 2165 u64 num_bytes, int reserve, int sinfo); 2166 int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, 2167 struct btrfs_root *root); 2168 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 2169 struct btrfs_root *root); 2170 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 2171 struct btrfs_root *root, 2172 u64 bytenr, u64 num_bytes, u64 parent, 2173 u64 root_objectid, u64 owner, u64 offset); 2174 2175 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 2176 struct btrfs_root *root); 2177 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 2178 int btrfs_free_block_groups(struct btrfs_fs_info *info); 2179 int btrfs_read_block_groups(struct btrfs_root *root); 2180 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); 2181 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 2182 struct btrfs_root *root, u64 bytes_used, 2183 u64 type, u64 chunk_objectid, u64 chunk_offset, 2184 u64 size); 2185 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 2186 struct btrfs_root *root, u64 group_start); 2187 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); 2188 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data); 2189 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); 2190 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 2191 int btrfs_check_data_free_space(struct inode *inode, u64 bytes); 2192 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes); 2193 int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans, 2194 struct btrfs_root *root, 2195 int num_items); 2196 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, 2197 struct btrfs_root *root); 2198 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, 2199 struct inode *inode); 2200 void btrfs_orphan_release_metadata(struct inode *inode); 2201 int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans, 2202 struct btrfs_pending_snapshot *pending); 2203 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); 2204 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); 2205 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes); 2206 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes); 2207 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv); 2208 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root); 2209 void btrfs_free_block_rsv(struct btrfs_root *root, 2210 struct btrfs_block_rsv *rsv); 2211 void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info, 2212 struct btrfs_block_rsv *rsv); 2213 int btrfs_block_rsv_add(struct btrfs_trans_handle *trans, 2214 struct btrfs_root *root, 2215 struct btrfs_block_rsv *block_rsv, 2216 u64 num_bytes); 2217 int btrfs_block_rsv_check(struct btrfs_trans_handle *trans, 2218 struct btrfs_root *root, 2219 struct btrfs_block_rsv *block_rsv, 2220 u64 min_reserved, int min_factor); 2221 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, 2222 struct btrfs_block_rsv *dst_rsv, 2223 u64 num_bytes); 2224 void btrfs_block_rsv_release(struct btrfs_root *root, 2225 struct btrfs_block_rsv *block_rsv, 2226 u64 num_bytes); 2227 int btrfs_set_block_group_ro(struct btrfs_root *root, 2228 struct btrfs_block_group_cache *cache); 2229 int btrfs_set_block_group_rw(struct btrfs_root *root, 2230 struct btrfs_block_group_cache *cache); 2231 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 2232 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 2233 int btrfs_error_unpin_extent_range(struct btrfs_root *root, 2234 u64 start, u64 end); 2235 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, 2236 u64 num_bytes, u64 *actual_bytes); 2237 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, 2238 struct btrfs_root *root, u64 type); 2239 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); 2240 2241 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 2242 /* ctree.c */ 2243 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, 2244 int level, int *slot); 2245 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); 2246 int btrfs_previous_item(struct btrfs_root *root, 2247 struct btrfs_path *path, u64 min_objectid, 2248 int type); 2249 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, 2250 struct btrfs_root *root, struct btrfs_path *path, 2251 struct btrfs_key *new_key); 2252 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 2253 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 2254 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 2255 struct btrfs_key *key, int lowest_level, 2256 int cache_only, u64 min_trans); 2257 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 2258 struct btrfs_key *max_key, 2259 struct btrfs_path *path, int cache_only, 2260 u64 min_trans); 2261 int btrfs_cow_block(struct btrfs_trans_handle *trans, 2262 struct btrfs_root *root, struct extent_buffer *buf, 2263 struct extent_buffer *parent, int parent_slot, 2264 struct extent_buffer **cow_ret); 2265 int btrfs_copy_root(struct btrfs_trans_handle *trans, 2266 struct btrfs_root *root, 2267 struct extent_buffer *buf, 2268 struct extent_buffer **cow_ret, u64 new_root_objectid); 2269 int btrfs_block_can_be_shared(struct btrfs_root *root, 2270 struct extent_buffer *buf); 2271 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root 2272 *root, struct btrfs_path *path, u32 data_size); 2273 int btrfs_truncate_item(struct btrfs_trans_handle *trans, 2274 struct btrfs_root *root, 2275 struct btrfs_path *path, 2276 u32 new_size, int from_end); 2277 int btrfs_split_item(struct btrfs_trans_handle *trans, 2278 struct btrfs_root *root, 2279 struct btrfs_path *path, 2280 struct btrfs_key *new_key, 2281 unsigned long split_offset); 2282 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 2283 struct btrfs_root *root, 2284 struct btrfs_path *path, 2285 struct btrfs_key *new_key); 2286 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 2287 *root, struct btrfs_key *key, struct btrfs_path *p, int 2288 ins_len, int cow); 2289 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 2290 struct btrfs_root *root, struct extent_buffer *parent, 2291 int start_slot, int cache_only, u64 *last_ret, 2292 struct btrfs_key *progress); 2293 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p); 2294 struct btrfs_path *btrfs_alloc_path(void); 2295 void btrfs_free_path(struct btrfs_path *p); 2296 void btrfs_set_path_blocking(struct btrfs_path *p); 2297 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 2298 2299 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2300 struct btrfs_path *path, int slot, int nr); 2301 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 2302 struct btrfs_root *root, 2303 struct btrfs_path *path) 2304 { 2305 return btrfs_del_items(trans, root, path, path->slots[0], 1); 2306 } 2307 2308 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 2309 *root, struct btrfs_key *key, void *data, u32 data_size); 2310 int btrfs_insert_some_items(struct btrfs_trans_handle *trans, 2311 struct btrfs_root *root, 2312 struct btrfs_path *path, 2313 struct btrfs_key *cpu_key, u32 *data_size, 2314 int nr); 2315 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 2316 struct btrfs_root *root, 2317 struct btrfs_path *path, 2318 struct btrfs_key *cpu_key, u32 *data_size, int nr); 2319 2320 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 2321 struct btrfs_root *root, 2322 struct btrfs_path *path, 2323 struct btrfs_key *key, 2324 u32 data_size) 2325 { 2326 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 2327 } 2328 2329 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 2330 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 2331 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 2332 int btrfs_drop_snapshot(struct btrfs_root *root, 2333 struct btrfs_block_rsv *block_rsv, int update_ref); 2334 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 2335 struct btrfs_root *root, 2336 struct extent_buffer *node, 2337 struct extent_buffer *parent); 2338 /* root-item.c */ 2339 int btrfs_find_root_ref(struct btrfs_root *tree_root, 2340 struct btrfs_path *path, 2341 u64 root_id, u64 ref_id); 2342 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 2343 struct btrfs_root *tree_root, 2344 u64 root_id, u64 ref_id, u64 dirid, u64 sequence, 2345 const char *name, int name_len); 2346 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, 2347 struct btrfs_root *tree_root, 2348 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, 2349 const char *name, int name_len); 2350 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 2351 struct btrfs_key *key); 2352 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 2353 *root, struct btrfs_key *key, struct btrfs_root_item 2354 *item); 2355 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root 2356 *root, struct btrfs_key *key, struct btrfs_root_item 2357 *item); 2358 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct 2359 btrfs_root_item *item, struct btrfs_key *key); 2360 int btrfs_search_root(struct btrfs_root *root, u64 search_start, 2361 u64 *found_objectid); 2362 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid); 2363 int btrfs_find_orphan_roots(struct btrfs_root *tree_root); 2364 int btrfs_set_root_node(struct btrfs_root_item *item, 2365 struct extent_buffer *node); 2366 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 2367 2368 /* dir-item.c */ 2369 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2370 struct btrfs_root *root, const char *name, 2371 int name_len, u64 dir, 2372 struct btrfs_key *location, u8 type, u64 index); 2373 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2374 struct btrfs_root *root, 2375 struct btrfs_path *path, u64 dir, 2376 const char *name, int name_len, 2377 int mod); 2378 struct btrfs_dir_item * 2379 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2380 struct btrfs_root *root, 2381 struct btrfs_path *path, u64 dir, 2382 u64 objectid, const char *name, int name_len, 2383 int mod); 2384 struct btrfs_dir_item * 2385 btrfs_search_dir_index_item(struct btrfs_root *root, 2386 struct btrfs_path *path, u64 dirid, 2387 const char *name, int name_len); 2388 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2389 struct btrfs_path *path, 2390 const char *name, int name_len); 2391 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2392 struct btrfs_root *root, 2393 struct btrfs_path *path, 2394 struct btrfs_dir_item *di); 2395 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2396 struct btrfs_root *root, 2397 struct btrfs_path *path, u64 objectid, 2398 const char *name, u16 name_len, 2399 const void *data, u16 data_len); 2400 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2401 struct btrfs_root *root, 2402 struct btrfs_path *path, u64 dir, 2403 const char *name, u16 name_len, 2404 int mod); 2405 int verify_dir_item(struct btrfs_root *root, 2406 struct extent_buffer *leaf, 2407 struct btrfs_dir_item *dir_item); 2408 2409 /* orphan.c */ 2410 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2411 struct btrfs_root *root, u64 offset); 2412 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2413 struct btrfs_root *root, u64 offset); 2414 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 2415 2416 /* inode-map.c */ 2417 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, 2418 struct btrfs_root *fs_root, 2419 u64 dirid, u64 *objectid); 2420 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid); 2421 2422 /* inode-item.c */ 2423 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2424 struct btrfs_root *root, 2425 const char *name, int name_len, 2426 u64 inode_objectid, u64 ref_objectid, u64 index); 2427 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2428 struct btrfs_root *root, 2429 const char *name, int name_len, 2430 u64 inode_objectid, u64 ref_objectid, u64 *index); 2431 struct btrfs_inode_ref * 2432 btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans, 2433 struct btrfs_root *root, 2434 struct btrfs_path *path, 2435 const char *name, int name_len, 2436 u64 inode_objectid, u64 ref_objectid, int mod); 2437 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2438 struct btrfs_root *root, 2439 struct btrfs_path *path, u64 objectid); 2440 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2441 *root, struct btrfs_path *path, 2442 struct btrfs_key *location, int mod); 2443 2444 /* file-item.c */ 2445 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2446 struct btrfs_root *root, u64 bytenr, u64 len); 2447 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 2448 struct bio *bio, u32 *dst); 2449 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, 2450 struct bio *bio, u64 logical_offset, u32 *dst); 2451 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2452 struct btrfs_root *root, 2453 u64 objectid, u64 pos, 2454 u64 disk_offset, u64 disk_num_bytes, 2455 u64 num_bytes, u64 offset, u64 ram_bytes, 2456 u8 compression, u8 encryption, u16 other_encoding); 2457 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2458 struct btrfs_root *root, 2459 struct btrfs_path *path, u64 objectid, 2460 u64 bytenr, int mod); 2461 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2462 struct btrfs_root *root, 2463 struct btrfs_ordered_sum *sums); 2464 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 2465 struct bio *bio, u64 file_start, int contig); 2466 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode, 2467 u64 start, unsigned long len); 2468 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, 2469 struct btrfs_root *root, 2470 struct btrfs_path *path, 2471 u64 bytenr, int cow); 2472 int btrfs_csum_truncate(struct btrfs_trans_handle *trans, 2473 struct btrfs_root *root, struct btrfs_path *path, 2474 u64 isize); 2475 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, 2476 u64 end, struct list_head *list); 2477 /* inode.c */ 2478 2479 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 2480 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 2481 #define ClearPageChecked ClearPageFsMisc 2482 #define SetPageChecked SetPageFsMisc 2483 #define PageChecked PageFsMisc 2484 #endif 2485 2486 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2487 int btrfs_set_inode_index(struct inode *dir, u64 *index); 2488 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2489 struct btrfs_root *root, 2490 struct inode *dir, struct inode *inode, 2491 const char *name, int name_len); 2492 int btrfs_add_link(struct btrfs_trans_handle *trans, 2493 struct inode *parent_inode, struct inode *inode, 2494 const char *name, int name_len, int add_backref, u64 index); 2495 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, 2496 struct btrfs_root *root, 2497 struct inode *dir, u64 objectid, 2498 const char *name, int name_len); 2499 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 2500 struct btrfs_root *root, 2501 struct inode *inode, u64 new_size, 2502 u32 min_type); 2503 2504 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput); 2505 int btrfs_start_one_delalloc_inode(struct btrfs_root *root, int delay_iput, 2506 int sync); 2507 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, 2508 struct extent_state **cached_state); 2509 int btrfs_writepages(struct address_space *mapping, 2510 struct writeback_control *wbc); 2511 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 2512 struct btrfs_root *new_root, 2513 u64 new_dirid, u64 alloc_hint); 2514 int btrfs_merge_bio_hook(struct page *page, unsigned long offset, 2515 size_t size, struct bio *bio, unsigned long bio_flags); 2516 2517 unsigned long btrfs_force_ra(struct address_space *mapping, 2518 struct file_ra_state *ra, struct file *file, 2519 pgoff_t offset, pgoff_t last_index); 2520 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2521 int btrfs_readpage(struct file *file, struct page *page); 2522 void btrfs_evict_inode(struct inode *inode); 2523 void btrfs_put_inode(struct inode *inode); 2524 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 2525 void btrfs_dirty_inode(struct inode *inode, int flags); 2526 struct inode *btrfs_alloc_inode(struct super_block *sb); 2527 void btrfs_destroy_inode(struct inode *inode); 2528 int btrfs_drop_inode(struct inode *inode); 2529 int btrfs_init_cachep(void); 2530 void btrfs_destroy_cachep(void); 2531 long btrfs_ioctl_trans_end(struct file *file); 2532 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 2533 struct btrfs_root *root, int *was_new); 2534 int btrfs_commit_write(struct file *file, struct page *page, 2535 unsigned from, unsigned to); 2536 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 2537 size_t page_offset, u64 start, u64 end, 2538 int create); 2539 int btrfs_update_inode(struct btrfs_trans_handle *trans, 2540 struct btrfs_root *root, 2541 struct inode *inode); 2542 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 2543 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); 2544 int btrfs_orphan_cleanup(struct btrfs_root *root); 2545 void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans, 2546 struct btrfs_pending_snapshot *pending, 2547 u64 *bytes_to_reserve); 2548 void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans, 2549 struct btrfs_pending_snapshot *pending); 2550 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, 2551 struct btrfs_root *root); 2552 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 2553 int btrfs_invalidate_inodes(struct btrfs_root *root); 2554 void btrfs_add_delayed_iput(struct inode *inode); 2555 void btrfs_run_delayed_iputs(struct btrfs_root *root); 2556 int btrfs_prealloc_file_range(struct inode *inode, int mode, 2557 u64 start, u64 num_bytes, u64 min_size, 2558 loff_t actual_len, u64 *alloc_hint); 2559 int btrfs_prealloc_file_range_trans(struct inode *inode, 2560 struct btrfs_trans_handle *trans, int mode, 2561 u64 start, u64 num_bytes, u64 min_size, 2562 loff_t actual_len, u64 *alloc_hint); 2563 extern const struct dentry_operations btrfs_dentry_operations; 2564 2565 /* ioctl.c */ 2566 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2567 void btrfs_update_iflags(struct inode *inode); 2568 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); 2569 2570 /* file.c */ 2571 int btrfs_sync_file(struct file *file, int datasync); 2572 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 2573 int skip_pinned); 2574 int btrfs_check_file(struct btrfs_root *root, struct inode *inode); 2575 extern const struct file_operations btrfs_file_operations; 2576 int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode, 2577 u64 start, u64 end, u64 *hint_byte, int drop_cache); 2578 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 2579 struct inode *inode, u64 start, u64 end); 2580 int btrfs_release_file(struct inode *inode, struct file *file); 2581 void btrfs_drop_pages(struct page **pages, size_t num_pages); 2582 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, 2583 struct page **pages, size_t num_pages, 2584 loff_t pos, size_t write_bytes, 2585 struct extent_state **cached); 2586 2587 /* tree-defrag.c */ 2588 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 2589 struct btrfs_root *root, int cache_only); 2590 2591 /* sysfs.c */ 2592 int btrfs_init_sysfs(void); 2593 void btrfs_exit_sysfs(void); 2594 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs); 2595 int btrfs_sysfs_add_root(struct btrfs_root *root); 2596 void btrfs_sysfs_del_root(struct btrfs_root *root); 2597 void btrfs_sysfs_del_super(struct btrfs_fs_info *root); 2598 2599 /* xattr.c */ 2600 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 2601 2602 /* super.c */ 2603 int btrfs_parse_options(struct btrfs_root *root, char *options); 2604 int btrfs_sync_fs(struct super_block *sb, int wait); 2605 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 2606 unsigned int line, int errno); 2607 2608 #define btrfs_std_error(fs_info, errno) \ 2609 do { \ 2610 if ((errno)) \ 2611 __btrfs_std_error((fs_info), __func__, __LINE__, (errno));\ 2612 } while (0) 2613 2614 /* acl.c */ 2615 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 2616 int btrfs_check_acl(struct inode *inode, int mask, unsigned int flags); 2617 #else 2618 #define btrfs_check_acl NULL 2619 #endif 2620 int btrfs_init_acl(struct btrfs_trans_handle *trans, 2621 struct inode *inode, struct inode *dir); 2622 int btrfs_acl_chmod(struct inode *inode); 2623 2624 /* relocation.c */ 2625 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 2626 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 2627 struct btrfs_root *root); 2628 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 2629 struct btrfs_root *root); 2630 int btrfs_recover_relocation(struct btrfs_root *root); 2631 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 2632 void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 2633 struct btrfs_root *root, struct extent_buffer *buf, 2634 struct extent_buffer *cow); 2635 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans, 2636 struct btrfs_pending_snapshot *pending, 2637 u64 *bytes_to_reserve); 2638 void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 2639 struct btrfs_pending_snapshot *pending); 2640 #endif 2641