1 /* 2 * Copyright (C) 2007 Oracle. All rights reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public 6 * License v2 as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 11 * General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public 14 * License along with this program; if not, write to the 15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 16 * Boston, MA 021110-1307, USA. 17 */ 18 19 #ifndef __BTRFS_CTREE__ 20 #define __BTRFS_CTREE__ 21 22 #include <linux/version.h> 23 #include <linux/mm.h> 24 #include <linux/highmem.h> 25 #include <linux/fs.h> 26 #include <linux/completion.h> 27 #include <linux/backing-dev.h> 28 #include <linux/wait.h> 29 #include <asm/kmap_types.h> 30 #include "extent_io.h" 31 #include "extent_map.h" 32 #include "async-thread.h" 33 34 struct btrfs_trans_handle; 35 struct btrfs_transaction; 36 extern struct kmem_cache *btrfs_trans_handle_cachep; 37 extern struct kmem_cache *btrfs_transaction_cachep; 38 extern struct kmem_cache *btrfs_bit_radix_cachep; 39 extern struct kmem_cache *btrfs_path_cachep; 40 struct btrfs_ordered_sum; 41 42 #define BTRFS_MAGIC "_BHRfS_M" 43 44 #define BTRFS_ACL_NOT_CACHED ((void *)-1) 45 46 #define BTRFS_MAX_LEVEL 8 47 48 /* 49 * files bigger than this get some pre-flushing when they are added 50 * to the ordered operations list. That way we limit the total 51 * work done by the commit 52 */ 53 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024) 54 55 /* holds pointers to all of the tree roots */ 56 #define BTRFS_ROOT_TREE_OBJECTID 1ULL 57 58 /* stores information about which extents are in use, and reference counts */ 59 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL 60 61 /* 62 * chunk tree stores translations from logical -> physical block numbering 63 * the super block points to the chunk tree 64 */ 65 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL 66 67 /* 68 * stores information about which areas of a given device are in use. 69 * one per device. The tree of tree roots points to the device tree 70 */ 71 #define BTRFS_DEV_TREE_OBJECTID 4ULL 72 73 /* one per subvolume, storing files and directories */ 74 #define BTRFS_FS_TREE_OBJECTID 5ULL 75 76 /* directory objectid inside the root tree */ 77 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL 78 79 /* holds checksums of all the data extents */ 80 #define BTRFS_CSUM_TREE_OBJECTID 7ULL 81 82 /* orhpan objectid for tracking unlinked/truncated files */ 83 #define BTRFS_ORPHAN_OBJECTID -5ULL 84 85 /* does write ahead logging to speed up fsyncs */ 86 #define BTRFS_TREE_LOG_OBJECTID -6ULL 87 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL 88 89 /* for space balancing */ 90 #define BTRFS_TREE_RELOC_OBJECTID -8ULL 91 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL 92 93 /* 94 * extent checksums all have this objectid 95 * this allows them to share the logging tree 96 * for fsyncs 97 */ 98 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL 99 100 /* dummy objectid represents multiple objectids */ 101 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL 102 103 /* 104 * All files have objectids in this range. 105 */ 106 #define BTRFS_FIRST_FREE_OBJECTID 256ULL 107 #define BTRFS_LAST_FREE_OBJECTID -256ULL 108 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL 109 110 111 /* 112 * the device items go into the chunk tree. The key is in the form 113 * [ 1 BTRFS_DEV_ITEM_KEY device_id ] 114 */ 115 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL 116 117 /* 118 * we can actually store much bigger names, but lets not confuse the rest 119 * of linux 120 */ 121 #define BTRFS_NAME_LEN 255 122 123 /* 32 bytes in various csum fields */ 124 #define BTRFS_CSUM_SIZE 32 125 126 /* csum types */ 127 #define BTRFS_CSUM_TYPE_CRC32 0 128 129 static int btrfs_csum_sizes[] = { 4, 0 }; 130 131 /* four bytes for CRC32 */ 132 #define BTRFS_EMPTY_DIR_SIZE 0 133 134 #define BTRFS_FT_UNKNOWN 0 135 #define BTRFS_FT_REG_FILE 1 136 #define BTRFS_FT_DIR 2 137 #define BTRFS_FT_CHRDEV 3 138 #define BTRFS_FT_BLKDEV 4 139 #define BTRFS_FT_FIFO 5 140 #define BTRFS_FT_SOCK 6 141 #define BTRFS_FT_SYMLINK 7 142 #define BTRFS_FT_XATTR 8 143 #define BTRFS_FT_MAX 9 144 145 /* 146 * The key defines the order in the tree, and so it also defines (optimal) 147 * block layout. 148 * 149 * objectid corresponds to the inode number. 150 * 151 * type tells us things about the object, and is a kind of stream selector. 152 * so for a given inode, keys with type of 1 might refer to the inode data, 153 * type of 2 may point to file data in the btree and type == 3 may point to 154 * extents. 155 * 156 * offset is the starting byte offset for this key in the stream. 157 * 158 * btrfs_disk_key is in disk byte order. struct btrfs_key is always 159 * in cpu native order. Otherwise they are identical and their sizes 160 * should be the same (ie both packed) 161 */ 162 struct btrfs_disk_key { 163 __le64 objectid; 164 u8 type; 165 __le64 offset; 166 } __attribute__ ((__packed__)); 167 168 struct btrfs_key { 169 u64 objectid; 170 u8 type; 171 u64 offset; 172 } __attribute__ ((__packed__)); 173 174 struct btrfs_mapping_tree { 175 struct extent_map_tree map_tree; 176 }; 177 178 #define BTRFS_UUID_SIZE 16 179 struct btrfs_dev_item { 180 /* the internal btrfs device id */ 181 __le64 devid; 182 183 /* size of the device */ 184 __le64 total_bytes; 185 186 /* bytes used */ 187 __le64 bytes_used; 188 189 /* optimal io alignment for this device */ 190 __le32 io_align; 191 192 /* optimal io width for this device */ 193 __le32 io_width; 194 195 /* minimal io size for this device */ 196 __le32 sector_size; 197 198 /* type and info about this device */ 199 __le64 type; 200 201 /* expected generation for this device */ 202 __le64 generation; 203 204 /* 205 * starting byte of this partition on the device, 206 * to allow for stripe alignment in the future 207 */ 208 __le64 start_offset; 209 210 /* grouping information for allocation decisions */ 211 __le32 dev_group; 212 213 /* seek speed 0-100 where 100 is fastest */ 214 u8 seek_speed; 215 216 /* bandwidth 0-100 where 100 is fastest */ 217 u8 bandwidth; 218 219 /* btrfs generated uuid for this device */ 220 u8 uuid[BTRFS_UUID_SIZE]; 221 222 /* uuid of FS who owns this device */ 223 u8 fsid[BTRFS_UUID_SIZE]; 224 } __attribute__ ((__packed__)); 225 226 struct btrfs_stripe { 227 __le64 devid; 228 __le64 offset; 229 u8 dev_uuid[BTRFS_UUID_SIZE]; 230 } __attribute__ ((__packed__)); 231 232 struct btrfs_chunk { 233 /* size of this chunk in bytes */ 234 __le64 length; 235 236 /* objectid of the root referencing this chunk */ 237 __le64 owner; 238 239 __le64 stripe_len; 240 __le64 type; 241 242 /* optimal io alignment for this chunk */ 243 __le32 io_align; 244 245 /* optimal io width for this chunk */ 246 __le32 io_width; 247 248 /* minimal io size for this chunk */ 249 __le32 sector_size; 250 251 /* 2^16 stripes is quite a lot, a second limit is the size of a single 252 * item in the btree 253 */ 254 __le16 num_stripes; 255 256 /* sub stripes only matter for raid10 */ 257 __le16 sub_stripes; 258 struct btrfs_stripe stripe; 259 /* additional stripes go here */ 260 } __attribute__ ((__packed__)); 261 262 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 263 { 264 BUG_ON(num_stripes == 0); 265 return sizeof(struct btrfs_chunk) + 266 sizeof(struct btrfs_stripe) * (num_stripes - 1); 267 } 268 269 #define BTRFS_FSID_SIZE 16 270 #define BTRFS_HEADER_FLAG_WRITTEN (1 << 0) 271 272 /* 273 * every tree block (leaf or node) starts with this header. 274 */ 275 struct btrfs_header { 276 /* these first four must match the super block */ 277 u8 csum[BTRFS_CSUM_SIZE]; 278 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 279 __le64 bytenr; /* which block this node is supposed to live in */ 280 __le64 flags; 281 282 /* allowed to be different from the super from here on down */ 283 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 284 __le64 generation; 285 __le64 owner; 286 __le32 nritems; 287 u8 level; 288 } __attribute__ ((__packed__)); 289 290 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ 291 sizeof(struct btrfs_header)) / \ 292 sizeof(struct btrfs_key_ptr)) 293 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) 294 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize)) 295 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 296 sizeof(struct btrfs_item) - \ 297 sizeof(struct btrfs_file_extent_item)) 298 299 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) 300 301 /* 302 * this is a very generous portion of the super block, giving us 303 * room to translate 14 chunks with 3 stripes each. 304 */ 305 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 306 #define BTRFS_LABEL_SIZE 256 307 308 /* 309 * the super block basically lists the main trees of the FS 310 * it currently lacks any block count etc etc 311 */ 312 struct btrfs_super_block { 313 u8 csum[BTRFS_CSUM_SIZE]; 314 /* the first 4 fields must match struct btrfs_header */ 315 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 316 __le64 bytenr; /* this block number */ 317 __le64 flags; 318 319 /* allowed to be different from the btrfs_header from here own down */ 320 __le64 magic; 321 __le64 generation; 322 __le64 root; 323 __le64 chunk_root; 324 __le64 log_root; 325 326 /* this will help find the new super based on the log root */ 327 __le64 log_root_transid; 328 __le64 total_bytes; 329 __le64 bytes_used; 330 __le64 root_dir_objectid; 331 __le64 num_devices; 332 __le32 sectorsize; 333 __le32 nodesize; 334 __le32 leafsize; 335 __le32 stripesize; 336 __le32 sys_chunk_array_size; 337 __le64 chunk_root_generation; 338 __le64 compat_flags; 339 __le64 compat_ro_flags; 340 __le64 incompat_flags; 341 __le16 csum_type; 342 u8 root_level; 343 u8 chunk_root_level; 344 u8 log_root_level; 345 struct btrfs_dev_item dev_item; 346 347 char label[BTRFS_LABEL_SIZE]; 348 349 /* future expansion */ 350 __le64 reserved[32]; 351 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 352 } __attribute__ ((__packed__)); 353 354 /* 355 * Compat flags that we support. If any incompat flags are set other than the 356 * ones specified below then we will fail to mount 357 */ 358 #define BTRFS_FEATURE_COMPAT_SUPP 0x0 359 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0x0 360 #define BTRFS_FEATURE_INCOMPAT_SUPP 0x0 361 362 /* 363 * A leaf is full of items. offset and size tell us where to find 364 * the item in the leaf (relative to the start of the data area) 365 */ 366 struct btrfs_item { 367 struct btrfs_disk_key key; 368 __le32 offset; 369 __le32 size; 370 } __attribute__ ((__packed__)); 371 372 /* 373 * leaves have an item area and a data area: 374 * [item0, item1....itemN] [free space] [dataN...data1, data0] 375 * 376 * The data is separate from the items to get the keys closer together 377 * during searches. 378 */ 379 struct btrfs_leaf { 380 struct btrfs_header header; 381 struct btrfs_item items[]; 382 } __attribute__ ((__packed__)); 383 384 /* 385 * all non-leaf blocks are nodes, they hold only keys and pointers to 386 * other blocks 387 */ 388 struct btrfs_key_ptr { 389 struct btrfs_disk_key key; 390 __le64 blockptr; 391 __le64 generation; 392 } __attribute__ ((__packed__)); 393 394 struct btrfs_node { 395 struct btrfs_header header; 396 struct btrfs_key_ptr ptrs[]; 397 } __attribute__ ((__packed__)); 398 399 /* 400 * btrfs_paths remember the path taken from the root down to the leaf. 401 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 402 * to any other levels that are present. 403 * 404 * The slots array records the index of the item or block pointer 405 * used while walking the tree. 406 */ 407 struct btrfs_path { 408 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 409 int slots[BTRFS_MAX_LEVEL]; 410 /* if there is real range locking, this locks field will change */ 411 int locks[BTRFS_MAX_LEVEL]; 412 int reada; 413 /* keep some upper locks as we walk down */ 414 int lowest_level; 415 416 /* 417 * set by btrfs_split_item, tells search_slot to keep all locks 418 * and to force calls to keep space in the nodes 419 */ 420 unsigned int search_for_split:1; 421 unsigned int keep_locks:1; 422 unsigned int skip_locking:1; 423 unsigned int leave_spinning:1; 424 }; 425 426 /* 427 * items in the extent btree are used to record the objectid of the 428 * owner of the block and the number of references 429 */ 430 struct btrfs_extent_item { 431 __le32 refs; 432 } __attribute__ ((__packed__)); 433 434 struct btrfs_extent_ref { 435 __le64 root; 436 __le64 generation; 437 __le64 objectid; 438 __le32 num_refs; 439 } __attribute__ ((__packed__)); 440 441 /* dev extents record free space on individual devices. The owner 442 * field points back to the chunk allocation mapping tree that allocated 443 * the extent. The chunk tree uuid field is a way to double check the owner 444 */ 445 struct btrfs_dev_extent { 446 __le64 chunk_tree; 447 __le64 chunk_objectid; 448 __le64 chunk_offset; 449 __le64 length; 450 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 451 } __attribute__ ((__packed__)); 452 453 struct btrfs_inode_ref { 454 __le64 index; 455 __le16 name_len; 456 /* name goes here */ 457 } __attribute__ ((__packed__)); 458 459 struct btrfs_timespec { 460 __le64 sec; 461 __le32 nsec; 462 } __attribute__ ((__packed__)); 463 464 enum btrfs_compression_type { 465 BTRFS_COMPRESS_NONE = 0, 466 BTRFS_COMPRESS_ZLIB = 1, 467 BTRFS_COMPRESS_LAST = 2, 468 }; 469 470 struct btrfs_inode_item { 471 /* nfs style generation number */ 472 __le64 generation; 473 /* transid that last touched this inode */ 474 __le64 transid; 475 __le64 size; 476 __le64 nbytes; 477 __le64 block_group; 478 __le32 nlink; 479 __le32 uid; 480 __le32 gid; 481 __le32 mode; 482 __le64 rdev; 483 __le64 flags; 484 485 /* modification sequence number for NFS */ 486 __le64 sequence; 487 488 /* 489 * a little future expansion, for more than this we can 490 * just grow the inode item and version it 491 */ 492 __le64 reserved[4]; 493 struct btrfs_timespec atime; 494 struct btrfs_timespec ctime; 495 struct btrfs_timespec mtime; 496 struct btrfs_timespec otime; 497 } __attribute__ ((__packed__)); 498 499 struct btrfs_dir_log_item { 500 __le64 end; 501 } __attribute__ ((__packed__)); 502 503 struct btrfs_dir_item { 504 struct btrfs_disk_key location; 505 __le64 transid; 506 __le16 data_len; 507 __le16 name_len; 508 u8 type; 509 } __attribute__ ((__packed__)); 510 511 struct btrfs_root_item { 512 struct btrfs_inode_item inode; 513 __le64 generation; 514 __le64 root_dirid; 515 __le64 bytenr; 516 __le64 byte_limit; 517 __le64 bytes_used; 518 __le64 last_snapshot; 519 __le64 flags; 520 __le32 refs; 521 struct btrfs_disk_key drop_progress; 522 u8 drop_level; 523 u8 level; 524 } __attribute__ ((__packed__)); 525 526 /* 527 * this is used for both forward and backward root refs 528 */ 529 struct btrfs_root_ref { 530 __le64 dirid; 531 __le64 sequence; 532 __le16 name_len; 533 } __attribute__ ((__packed__)); 534 535 #define BTRFS_FILE_EXTENT_INLINE 0 536 #define BTRFS_FILE_EXTENT_REG 1 537 #define BTRFS_FILE_EXTENT_PREALLOC 2 538 539 struct btrfs_file_extent_item { 540 /* 541 * transaction id that created this extent 542 */ 543 __le64 generation; 544 /* 545 * max number of bytes to hold this extent in ram 546 * when we split a compressed extent we can't know how big 547 * each of the resulting pieces will be. So, this is 548 * an upper limit on the size of the extent in ram instead of 549 * an exact limit. 550 */ 551 __le64 ram_bytes; 552 553 /* 554 * 32 bits for the various ways we might encode the data, 555 * including compression and encryption. If any of these 556 * are set to something a given disk format doesn't understand 557 * it is treated like an incompat flag for reading and writing, 558 * but not for stat. 559 */ 560 u8 compression; 561 u8 encryption; 562 __le16 other_encoding; /* spare for later use */ 563 564 /* are we inline data or a real extent? */ 565 u8 type; 566 567 /* 568 * disk space consumed by the extent, checksum blocks are included 569 * in these numbers 570 */ 571 __le64 disk_bytenr; 572 __le64 disk_num_bytes; 573 /* 574 * the logical offset in file blocks (no csums) 575 * this extent record is for. This allows a file extent to point 576 * into the middle of an existing extent on disk, sharing it 577 * between two snapshots (useful if some bytes in the middle of the 578 * extent have changed 579 */ 580 __le64 offset; 581 /* 582 * the logical number of file blocks (no csums included). This 583 * always reflects the size uncompressed and without encoding. 584 */ 585 __le64 num_bytes; 586 587 } __attribute__ ((__packed__)); 588 589 struct btrfs_csum_item { 590 u8 csum; 591 } __attribute__ ((__packed__)); 592 593 /* different types of block groups (and chunks) */ 594 #define BTRFS_BLOCK_GROUP_DATA (1 << 0) 595 #define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1) 596 #define BTRFS_BLOCK_GROUP_METADATA (1 << 2) 597 #define BTRFS_BLOCK_GROUP_RAID0 (1 << 3) 598 #define BTRFS_BLOCK_GROUP_RAID1 (1 << 4) 599 #define BTRFS_BLOCK_GROUP_DUP (1 << 5) 600 #define BTRFS_BLOCK_GROUP_RAID10 (1 << 6) 601 602 struct btrfs_block_group_item { 603 __le64 used; 604 __le64 chunk_objectid; 605 __le64 flags; 606 } __attribute__ ((__packed__)); 607 608 struct btrfs_space_info { 609 u64 flags; 610 611 u64 total_bytes; /* total bytes in the space */ 612 u64 bytes_used; /* total bytes used on disk */ 613 u64 bytes_pinned; /* total bytes pinned, will be freed when the 614 transaction finishes */ 615 u64 bytes_reserved; /* total bytes the allocator has reserved for 616 current allocations */ 617 u64 bytes_readonly; /* total bytes that are read only */ 618 619 /* delalloc accounting */ 620 u64 bytes_delalloc; /* number of bytes reserved for allocation, 621 this space is not necessarily reserved yet 622 by the allocator */ 623 u64 bytes_may_use; /* number of bytes that may be used for 624 delalloc */ 625 626 int full; /* indicates that we cannot allocate any more 627 chunks for this space */ 628 int force_alloc; /* set if we need to force a chunk alloc for 629 this space */ 630 631 struct list_head list; 632 633 /* for block groups in our same type */ 634 struct list_head block_groups; 635 spinlock_t lock; 636 struct rw_semaphore groups_sem; 637 }; 638 639 /* 640 * free clusters are used to claim free space in relatively large chunks, 641 * allowing us to do less seeky writes. They are used for all metadata 642 * allocations and data allocations in ssd mode. 643 */ 644 struct btrfs_free_cluster { 645 spinlock_t lock; 646 spinlock_t refill_lock; 647 struct rb_root root; 648 649 /* largest extent in this cluster */ 650 u64 max_size; 651 652 /* first extent starting offset */ 653 u64 window_start; 654 655 struct btrfs_block_group_cache *block_group; 656 /* 657 * when a cluster is allocated from a block group, we put the 658 * cluster onto a list in the block group so that it can 659 * be freed before the block group is freed. 660 */ 661 struct list_head block_group_list; 662 }; 663 664 struct btrfs_block_group_cache { 665 struct btrfs_key key; 666 struct btrfs_block_group_item item; 667 spinlock_t lock; 668 struct mutex cache_mutex; 669 u64 pinned; 670 u64 reserved; 671 u64 flags; 672 int cached; 673 int ro; 674 int dirty; 675 676 struct btrfs_space_info *space_info; 677 678 /* free space cache stuff */ 679 spinlock_t tree_lock; 680 struct rb_root free_space_bytes; 681 struct rb_root free_space_offset; 682 683 /* block group cache stuff */ 684 struct rb_node cache_node; 685 686 /* for block groups in the same raid type */ 687 struct list_head list; 688 689 /* usage count */ 690 atomic_t count; 691 692 /* List of struct btrfs_free_clusters for this block group. 693 * Today it will only have one thing on it, but that may change 694 */ 695 struct list_head cluster_list; 696 }; 697 698 struct btrfs_leaf_ref_tree { 699 struct rb_root root; 700 struct list_head list; 701 spinlock_t lock; 702 }; 703 704 struct btrfs_device; 705 struct btrfs_fs_devices; 706 struct btrfs_fs_info { 707 u8 fsid[BTRFS_FSID_SIZE]; 708 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 709 struct btrfs_root *extent_root; 710 struct btrfs_root *tree_root; 711 struct btrfs_root *chunk_root; 712 struct btrfs_root *dev_root; 713 struct btrfs_root *fs_root; 714 struct btrfs_root *csum_root; 715 716 /* the log root tree is a directory of all the other log roots */ 717 struct btrfs_root *log_root_tree; 718 struct radix_tree_root fs_roots_radix; 719 720 /* block group cache stuff */ 721 spinlock_t block_group_cache_lock; 722 struct rb_root block_group_cache_tree; 723 724 struct extent_io_tree pinned_extents; 725 726 /* logical->physical extent mapping */ 727 struct btrfs_mapping_tree mapping_tree; 728 729 u64 generation; 730 u64 last_trans_committed; 731 732 /* 733 * this is updated to the current trans every time a full commit 734 * is required instead of the faster short fsync log commits 735 */ 736 u64 last_trans_log_full_commit; 737 u64 open_ioctl_trans; 738 unsigned long mount_opt; 739 u64 max_extent; 740 u64 max_inline; 741 u64 alloc_start; 742 struct btrfs_transaction *running_transaction; 743 wait_queue_head_t transaction_throttle; 744 wait_queue_head_t transaction_wait; 745 wait_queue_head_t async_submit_wait; 746 747 struct btrfs_super_block super_copy; 748 struct btrfs_super_block super_for_commit; 749 struct block_device *__bdev; 750 struct super_block *sb; 751 struct inode *btree_inode; 752 struct backing_dev_info bdi; 753 struct mutex trans_mutex; 754 struct mutex tree_log_mutex; 755 struct mutex transaction_kthread_mutex; 756 struct mutex cleaner_mutex; 757 struct mutex chunk_mutex; 758 struct mutex drop_mutex; 759 struct mutex volume_mutex; 760 struct mutex tree_reloc_mutex; 761 762 /* 763 * this protects the ordered operations list only while we are 764 * processing all of the entries on it. This way we make 765 * sure the commit code doesn't find the list temporarily empty 766 * because another function happens to be doing non-waiting preflush 767 * before jumping into the main commit. 768 */ 769 struct mutex ordered_operations_mutex; 770 771 struct list_head trans_list; 772 struct list_head hashers; 773 struct list_head dead_roots; 774 775 atomic_t nr_async_submits; 776 atomic_t async_submit_draining; 777 atomic_t nr_async_bios; 778 atomic_t async_delalloc_pages; 779 780 /* 781 * this is used by the balancing code to wait for all the pending 782 * ordered extents 783 */ 784 spinlock_t ordered_extent_lock; 785 786 /* 787 * all of the data=ordered extents pending writeback 788 * these can span multiple transactions and basically include 789 * every dirty data page that isn't from nodatacow 790 */ 791 struct list_head ordered_extents; 792 793 /* 794 * all of the inodes that have delalloc bytes. It is possible for 795 * this list to be empty even when there is still dirty data=ordered 796 * extents waiting to finish IO. 797 */ 798 struct list_head delalloc_inodes; 799 800 /* 801 * special rename and truncate targets that must be on disk before 802 * we're allowed to commit. This is basically the ext3 style 803 * data=ordered list. 804 */ 805 struct list_head ordered_operations; 806 807 /* 808 * there is a pool of worker threads for checksumming during writes 809 * and a pool for checksumming after reads. This is because readers 810 * can run with FS locks held, and the writers may be waiting for 811 * those locks. We don't want ordering in the pending list to cause 812 * deadlocks, and so the two are serviced separately. 813 * 814 * A third pool does submit_bio to avoid deadlocking with the other 815 * two 816 */ 817 struct btrfs_workers workers; 818 struct btrfs_workers delalloc_workers; 819 struct btrfs_workers endio_workers; 820 struct btrfs_workers endio_meta_workers; 821 struct btrfs_workers endio_meta_write_workers; 822 struct btrfs_workers endio_write_workers; 823 struct btrfs_workers submit_workers; 824 /* 825 * fixup workers take dirty pages that didn't properly go through 826 * the cow mechanism and make them safe to write. It happens 827 * for the sys_munmap function call path 828 */ 829 struct btrfs_workers fixup_workers; 830 struct task_struct *transaction_kthread; 831 struct task_struct *cleaner_kthread; 832 int thread_pool_size; 833 834 /* tree relocation relocated fields */ 835 struct list_head dead_reloc_roots; 836 struct btrfs_leaf_ref_tree reloc_ref_tree; 837 struct btrfs_leaf_ref_tree shared_ref_tree; 838 839 struct kobject super_kobj; 840 struct completion kobj_unregister; 841 int do_barriers; 842 int closing; 843 int log_root_recovering; 844 atomic_t throttles; 845 atomic_t throttle_gen; 846 847 u64 total_pinned; 848 849 /* protected by the delalloc lock, used to keep from writing 850 * metadata until there is a nice batch 851 */ 852 u64 dirty_metadata_bytes; 853 struct list_head dirty_cowonly_roots; 854 855 struct btrfs_fs_devices *fs_devices; 856 857 /* 858 * the space_info list is almost entirely read only. It only changes 859 * when we add a new raid type to the FS, and that happens 860 * very rarely. RCU is used to protect it. 861 */ 862 struct list_head space_info; 863 864 spinlock_t delalloc_lock; 865 spinlock_t new_trans_lock; 866 u64 delalloc_bytes; 867 868 /* data_alloc_cluster is only used in ssd mode */ 869 struct btrfs_free_cluster data_alloc_cluster; 870 871 /* all metadata allocations go through this cluster */ 872 struct btrfs_free_cluster meta_alloc_cluster; 873 874 spinlock_t ref_cache_lock; 875 u64 total_ref_cache_size; 876 877 u64 avail_data_alloc_bits; 878 u64 avail_metadata_alloc_bits; 879 u64 avail_system_alloc_bits; 880 u64 data_alloc_profile; 881 u64 metadata_alloc_profile; 882 u64 system_alloc_profile; 883 884 unsigned data_chunk_allocations; 885 unsigned metadata_ratio; 886 887 void *bdev_holder; 888 }; 889 890 /* 891 * in ram representation of the tree. extent_root is used for all allocations 892 * and for the extent tree extent_root root. 893 */ 894 struct btrfs_dirty_root; 895 struct btrfs_root { 896 struct extent_buffer *node; 897 898 /* the node lock is held while changing the node pointer */ 899 spinlock_t node_lock; 900 901 struct extent_buffer *commit_root; 902 struct btrfs_leaf_ref_tree *ref_tree; 903 struct btrfs_leaf_ref_tree ref_tree_struct; 904 struct btrfs_dirty_root *dirty_root; 905 struct btrfs_root *log_root; 906 struct btrfs_root *reloc_root; 907 908 struct btrfs_root_item root_item; 909 struct btrfs_key root_key; 910 struct btrfs_fs_info *fs_info; 911 struct extent_io_tree dirty_log_pages; 912 913 struct kobject root_kobj; 914 struct completion kobj_unregister; 915 struct mutex objectid_mutex; 916 917 struct mutex log_mutex; 918 wait_queue_head_t log_writer_wait; 919 wait_queue_head_t log_commit_wait[2]; 920 atomic_t log_writers; 921 atomic_t log_commit[2]; 922 unsigned long log_transid; 923 unsigned long log_batch; 924 925 u64 objectid; 926 u64 last_trans; 927 928 /* data allocations are done in sectorsize units */ 929 u32 sectorsize; 930 931 /* node allocations are done in nodesize units */ 932 u32 nodesize; 933 934 /* leaf allocations are done in leafsize units */ 935 u32 leafsize; 936 937 u32 stripesize; 938 939 u32 type; 940 u64 highest_inode; 941 u64 last_inode_alloc; 942 int ref_cows; 943 int track_dirty; 944 u64 defrag_trans_start; 945 struct btrfs_key defrag_progress; 946 struct btrfs_key defrag_max; 947 int defrag_running; 948 int defrag_level; 949 char *name; 950 int in_sysfs; 951 952 /* the dirty list is only used by non-reference counted roots */ 953 struct list_head dirty_list; 954 955 spinlock_t list_lock; 956 struct list_head dead_list; 957 struct list_head orphan_list; 958 959 /* 960 * right now this just gets used so that a root has its own devid 961 * for stat. It may be used for more later 962 */ 963 struct super_block anon_super; 964 }; 965 966 /* 967 * inode items have the data typically returned from stat and store other 968 * info about object characteristics. There is one for every file and dir in 969 * the FS 970 */ 971 #define BTRFS_INODE_ITEM_KEY 1 972 #define BTRFS_INODE_REF_KEY 12 973 #define BTRFS_XATTR_ITEM_KEY 24 974 #define BTRFS_ORPHAN_ITEM_KEY 48 975 /* reserve 2-15 close to the inode for later flexibility */ 976 977 /* 978 * dir items are the name -> inode pointers in a directory. There is one 979 * for every name in a directory. 980 */ 981 #define BTRFS_DIR_LOG_ITEM_KEY 60 982 #define BTRFS_DIR_LOG_INDEX_KEY 72 983 #define BTRFS_DIR_ITEM_KEY 84 984 #define BTRFS_DIR_INDEX_KEY 96 985 /* 986 * extent data is for file data 987 */ 988 #define BTRFS_EXTENT_DATA_KEY 108 989 990 /* 991 * extent csums are stored in a separate tree and hold csums for 992 * an entire extent on disk. 993 */ 994 #define BTRFS_EXTENT_CSUM_KEY 128 995 996 /* 997 * root items point to tree roots. They are typically in the root 998 * tree used by the super block to find all the other trees 999 */ 1000 #define BTRFS_ROOT_ITEM_KEY 132 1001 1002 /* 1003 * root backrefs tie subvols and snapshots to the directory entries that 1004 * reference them 1005 */ 1006 #define BTRFS_ROOT_BACKREF_KEY 144 1007 1008 /* 1009 * root refs make a fast index for listing all of the snapshots and 1010 * subvolumes referenced by a given root. They point directly to the 1011 * directory item in the root that references the subvol 1012 */ 1013 #define BTRFS_ROOT_REF_KEY 156 1014 1015 /* 1016 * extent items are in the extent map tree. These record which blocks 1017 * are used, and how many references there are to each block 1018 */ 1019 #define BTRFS_EXTENT_ITEM_KEY 168 1020 #define BTRFS_EXTENT_REF_KEY 180 1021 1022 /* 1023 * block groups give us hints into the extent allocation trees. Which 1024 * blocks are free etc etc 1025 */ 1026 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 1027 1028 #define BTRFS_DEV_EXTENT_KEY 204 1029 #define BTRFS_DEV_ITEM_KEY 216 1030 #define BTRFS_CHUNK_ITEM_KEY 228 1031 1032 /* 1033 * string items are for debugging. They just store a short string of 1034 * data in the FS 1035 */ 1036 #define BTRFS_STRING_ITEM_KEY 253 1037 1038 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1039 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1040 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1041 #define BTRFS_MOUNT_SSD (1 << 3) 1042 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1043 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1044 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1045 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1046 1047 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1048 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1049 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1050 BTRFS_MOUNT_##opt) 1051 /* 1052 * Inode flags 1053 */ 1054 #define BTRFS_INODE_NODATASUM (1 << 0) 1055 #define BTRFS_INODE_NODATACOW (1 << 1) 1056 #define BTRFS_INODE_READONLY (1 << 2) 1057 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1058 #define BTRFS_INODE_PREALLOC (1 << 4) 1059 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \ 1060 ~BTRFS_INODE_##flag) 1061 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \ 1062 BTRFS_INODE_##flag) 1063 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \ 1064 BTRFS_INODE_##flag) 1065 /* some macros to generate set/get funcs for the struct fields. This 1066 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1067 * one for u8: 1068 */ 1069 #define le8_to_cpu(v) (v) 1070 #define cpu_to_le8(v) (v) 1071 #define __le8 u8 1072 1073 #define read_eb_member(eb, ptr, type, member, result) ( \ 1074 read_extent_buffer(eb, (char *)(result), \ 1075 ((unsigned long)(ptr)) + \ 1076 offsetof(type, member), \ 1077 sizeof(((type *)0)->member))) 1078 1079 #define write_eb_member(eb, ptr, type, member, result) ( \ 1080 write_extent_buffer(eb, (char *)(result), \ 1081 ((unsigned long)(ptr)) + \ 1082 offsetof(type, member), \ 1083 sizeof(((type *)0)->member))) 1084 1085 #ifndef BTRFS_SETGET_FUNCS 1086 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1087 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ 1088 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); 1089 #endif 1090 1091 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1092 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1093 { \ 1094 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1095 u##bits res = le##bits##_to_cpu(p->member); \ 1096 kunmap_atomic(p, KM_USER0); \ 1097 return res; \ 1098 } \ 1099 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1100 u##bits val) \ 1101 { \ 1102 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1103 p->member = cpu_to_le##bits(val); \ 1104 kunmap_atomic(p, KM_USER0); \ 1105 } 1106 1107 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1108 static inline u##bits btrfs_##name(type *s) \ 1109 { \ 1110 return le##bits##_to_cpu(s->member); \ 1111 } \ 1112 static inline void btrfs_set_##name(type *s, u##bits val) \ 1113 { \ 1114 s->member = cpu_to_le##bits(val); \ 1115 } 1116 1117 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1118 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1119 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1120 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1121 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1122 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1123 start_offset, 64); 1124 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1125 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1126 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1127 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1128 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1129 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1130 1131 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1132 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1133 total_bytes, 64); 1134 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1135 bytes_used, 64); 1136 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1137 io_align, 32); 1138 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1139 io_width, 32); 1140 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1141 sector_size, 32); 1142 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1143 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1144 dev_group, 32); 1145 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1146 seek_speed, 8); 1147 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1148 bandwidth, 8); 1149 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1150 generation, 64); 1151 1152 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d) 1153 { 1154 return (char *)d + offsetof(struct btrfs_dev_item, uuid); 1155 } 1156 1157 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d) 1158 { 1159 return (char *)d + offsetof(struct btrfs_dev_item, fsid); 1160 } 1161 1162 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1163 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1164 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1165 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1166 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1167 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1168 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1169 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1170 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1171 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1172 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1173 1174 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1175 { 1176 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1177 } 1178 1179 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1180 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1181 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1182 stripe_len, 64); 1183 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1184 io_align, 32); 1185 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1186 io_width, 32); 1187 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1188 sector_size, 32); 1189 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1190 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1191 num_stripes, 16); 1192 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1193 sub_stripes, 16); 1194 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1195 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1196 1197 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1198 int nr) 1199 { 1200 unsigned long offset = (unsigned long)c; 1201 offset += offsetof(struct btrfs_chunk, stripe); 1202 offset += nr * sizeof(struct btrfs_stripe); 1203 return (struct btrfs_stripe *)offset; 1204 } 1205 1206 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1207 { 1208 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1209 } 1210 1211 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1212 struct btrfs_chunk *c, int nr) 1213 { 1214 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1215 } 1216 1217 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb, 1218 struct btrfs_chunk *c, int nr, 1219 u64 val) 1220 { 1221 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val); 1222 } 1223 1224 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1225 struct btrfs_chunk *c, int nr) 1226 { 1227 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1228 } 1229 1230 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb, 1231 struct btrfs_chunk *c, int nr, 1232 u64 val) 1233 { 1234 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val); 1235 } 1236 1237 /* struct btrfs_block_group_item */ 1238 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1239 used, 64); 1240 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1241 used, 64); 1242 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1243 struct btrfs_block_group_item, chunk_objectid, 64); 1244 1245 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1246 struct btrfs_block_group_item, chunk_objectid, 64); 1247 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1248 struct btrfs_block_group_item, flags, 64); 1249 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1250 struct btrfs_block_group_item, flags, 64); 1251 1252 /* struct btrfs_inode_ref */ 1253 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1254 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1255 1256 /* struct btrfs_inode_item */ 1257 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1258 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1259 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1260 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1261 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1262 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1263 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1264 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1265 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1266 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1267 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1268 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1269 1270 static inline struct btrfs_timespec * 1271 btrfs_inode_atime(struct btrfs_inode_item *inode_item) 1272 { 1273 unsigned long ptr = (unsigned long)inode_item; 1274 ptr += offsetof(struct btrfs_inode_item, atime); 1275 return (struct btrfs_timespec *)ptr; 1276 } 1277 1278 static inline struct btrfs_timespec * 1279 btrfs_inode_mtime(struct btrfs_inode_item *inode_item) 1280 { 1281 unsigned long ptr = (unsigned long)inode_item; 1282 ptr += offsetof(struct btrfs_inode_item, mtime); 1283 return (struct btrfs_timespec *)ptr; 1284 } 1285 1286 static inline struct btrfs_timespec * 1287 btrfs_inode_ctime(struct btrfs_inode_item *inode_item) 1288 { 1289 unsigned long ptr = (unsigned long)inode_item; 1290 ptr += offsetof(struct btrfs_inode_item, ctime); 1291 return (struct btrfs_timespec *)ptr; 1292 } 1293 1294 static inline struct btrfs_timespec * 1295 btrfs_inode_otime(struct btrfs_inode_item *inode_item) 1296 { 1297 unsigned long ptr = (unsigned long)inode_item; 1298 ptr += offsetof(struct btrfs_inode_item, otime); 1299 return (struct btrfs_timespec *)ptr; 1300 } 1301 1302 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1303 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1304 1305 /* struct btrfs_dev_extent */ 1306 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1307 chunk_tree, 64); 1308 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1309 chunk_objectid, 64); 1310 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1311 chunk_offset, 64); 1312 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1313 1314 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1315 { 1316 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1317 return (u8 *)((unsigned long)dev + ptr); 1318 } 1319 1320 /* struct btrfs_extent_ref */ 1321 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64); 1322 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64); 1323 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64); 1324 BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32); 1325 1326 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64); 1327 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref, 1328 generation, 64); 1329 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref, 1330 objectid, 64); 1331 BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref, 1332 num_refs, 32); 1333 1334 /* struct btrfs_extent_item */ 1335 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32); 1336 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, 1337 refs, 32); 1338 1339 /* struct btrfs_node */ 1340 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1341 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1342 1343 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1344 { 1345 unsigned long ptr; 1346 ptr = offsetof(struct btrfs_node, ptrs) + 1347 sizeof(struct btrfs_key_ptr) * nr; 1348 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1349 } 1350 1351 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1352 int nr, u64 val) 1353 { 1354 unsigned long ptr; 1355 ptr = offsetof(struct btrfs_node, ptrs) + 1356 sizeof(struct btrfs_key_ptr) * nr; 1357 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1358 } 1359 1360 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1361 { 1362 unsigned long ptr; 1363 ptr = offsetof(struct btrfs_node, ptrs) + 1364 sizeof(struct btrfs_key_ptr) * nr; 1365 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1366 } 1367 1368 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1369 int nr, u64 val) 1370 { 1371 unsigned long ptr; 1372 ptr = offsetof(struct btrfs_node, ptrs) + 1373 sizeof(struct btrfs_key_ptr) * nr; 1374 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1375 } 1376 1377 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1378 { 1379 return offsetof(struct btrfs_node, ptrs) + 1380 sizeof(struct btrfs_key_ptr) * nr; 1381 } 1382 1383 void btrfs_node_key(struct extent_buffer *eb, 1384 struct btrfs_disk_key *disk_key, int nr); 1385 1386 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1387 struct btrfs_disk_key *disk_key, int nr) 1388 { 1389 unsigned long ptr; 1390 ptr = btrfs_node_key_ptr_offset(nr); 1391 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1392 struct btrfs_key_ptr, key, disk_key); 1393 } 1394 1395 /* struct btrfs_item */ 1396 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1397 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1398 1399 static inline unsigned long btrfs_item_nr_offset(int nr) 1400 { 1401 return offsetof(struct btrfs_leaf, items) + 1402 sizeof(struct btrfs_item) * nr; 1403 } 1404 1405 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, 1406 int nr) 1407 { 1408 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1409 } 1410 1411 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1412 struct btrfs_item *item) 1413 { 1414 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1415 } 1416 1417 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1418 { 1419 return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); 1420 } 1421 1422 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1423 { 1424 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); 1425 } 1426 1427 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1428 { 1429 return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); 1430 } 1431 1432 static inline void btrfs_item_key(struct extent_buffer *eb, 1433 struct btrfs_disk_key *disk_key, int nr) 1434 { 1435 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1436 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1437 } 1438 1439 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1440 struct btrfs_disk_key *disk_key, int nr) 1441 { 1442 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1443 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1444 } 1445 1446 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1447 1448 /* 1449 * struct btrfs_root_ref 1450 */ 1451 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1452 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1453 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1454 1455 /* struct btrfs_dir_item */ 1456 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1457 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1458 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1459 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1460 1461 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1462 struct btrfs_dir_item *item, 1463 struct btrfs_disk_key *key) 1464 { 1465 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1466 } 1467 1468 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1469 struct btrfs_dir_item *item, 1470 struct btrfs_disk_key *key) 1471 { 1472 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1473 } 1474 1475 /* struct btrfs_disk_key */ 1476 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1477 objectid, 64); 1478 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1479 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1480 1481 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1482 struct btrfs_disk_key *disk) 1483 { 1484 cpu->offset = le64_to_cpu(disk->offset); 1485 cpu->type = disk->type; 1486 cpu->objectid = le64_to_cpu(disk->objectid); 1487 } 1488 1489 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1490 struct btrfs_key *cpu) 1491 { 1492 disk->offset = cpu_to_le64(cpu->offset); 1493 disk->type = cpu->type; 1494 disk->objectid = cpu_to_le64(cpu->objectid); 1495 } 1496 1497 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1498 struct btrfs_key *key, int nr) 1499 { 1500 struct btrfs_disk_key disk_key; 1501 btrfs_node_key(eb, &disk_key, nr); 1502 btrfs_disk_key_to_cpu(key, &disk_key); 1503 } 1504 1505 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1506 struct btrfs_key *key, int nr) 1507 { 1508 struct btrfs_disk_key disk_key; 1509 btrfs_item_key(eb, &disk_key, nr); 1510 btrfs_disk_key_to_cpu(key, &disk_key); 1511 } 1512 1513 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1514 struct btrfs_dir_item *item, 1515 struct btrfs_key *key) 1516 { 1517 struct btrfs_disk_key disk_key; 1518 btrfs_dir_item_key(eb, item, &disk_key); 1519 btrfs_disk_key_to_cpu(key, &disk_key); 1520 } 1521 1522 1523 static inline u8 btrfs_key_type(struct btrfs_key *key) 1524 { 1525 return key->type; 1526 } 1527 1528 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1529 { 1530 key->type = val; 1531 } 1532 1533 /* struct btrfs_header */ 1534 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1535 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1536 generation, 64); 1537 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1538 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1539 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1540 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1541 1542 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1543 { 1544 return (btrfs_header_flags(eb) & flag) == flag; 1545 } 1546 1547 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1548 { 1549 u64 flags = btrfs_header_flags(eb); 1550 btrfs_set_header_flags(eb, flags | flag); 1551 return (flags & flag) == flag; 1552 } 1553 1554 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 1555 { 1556 u64 flags = btrfs_header_flags(eb); 1557 btrfs_set_header_flags(eb, flags & ~flag); 1558 return (flags & flag) == flag; 1559 } 1560 1561 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb) 1562 { 1563 unsigned long ptr = offsetof(struct btrfs_header, fsid); 1564 return (u8 *)ptr; 1565 } 1566 1567 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 1568 { 1569 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid); 1570 return (u8 *)ptr; 1571 } 1572 1573 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb) 1574 { 1575 unsigned long ptr = offsetof(struct btrfs_super_block, fsid); 1576 return (u8 *)ptr; 1577 } 1578 1579 static inline u8 *btrfs_header_csum(struct extent_buffer *eb) 1580 { 1581 unsigned long ptr = offsetof(struct btrfs_header, csum); 1582 return (u8 *)ptr; 1583 } 1584 1585 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb) 1586 { 1587 return NULL; 1588 } 1589 1590 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb) 1591 { 1592 return NULL; 1593 } 1594 1595 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb) 1596 { 1597 return NULL; 1598 } 1599 1600 static inline int btrfs_is_leaf(struct extent_buffer *eb) 1601 { 1602 return btrfs_header_level(eb) == 0; 1603 } 1604 1605 /* struct btrfs_root_item */ 1606 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 1607 generation, 64); 1608 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 1609 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 1610 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 1611 1612 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 1613 generation, 64); 1614 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 1615 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 1616 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 1617 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 1618 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 1619 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 1620 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 1621 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 1622 last_snapshot, 64); 1623 1624 /* struct btrfs_super_block */ 1625 1626 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 1627 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 1628 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 1629 generation, 64); 1630 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 1631 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 1632 struct btrfs_super_block, sys_chunk_array_size, 32); 1633 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 1634 struct btrfs_super_block, chunk_root_generation, 64); 1635 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 1636 root_level, 8); 1637 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 1638 chunk_root, 64); 1639 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 1640 chunk_root_level, 8); 1641 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 1642 log_root, 64); 1643 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 1644 log_root_transid, 64); 1645 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 1646 log_root_level, 8); 1647 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 1648 total_bytes, 64); 1649 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 1650 bytes_used, 64); 1651 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 1652 sectorsize, 32); 1653 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 1654 nodesize, 32); 1655 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, 1656 leafsize, 32); 1657 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 1658 stripesize, 32); 1659 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 1660 root_dir_objectid, 64); 1661 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 1662 num_devices, 64); 1663 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 1664 compat_flags, 64); 1665 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 1666 compat_flags, 64); 1667 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 1668 incompat_flags, 64); 1669 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 1670 csum_type, 16); 1671 1672 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 1673 { 1674 int t = btrfs_super_csum_type(s); 1675 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes)); 1676 return btrfs_csum_sizes[t]; 1677 } 1678 1679 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 1680 { 1681 return offsetof(struct btrfs_leaf, items); 1682 } 1683 1684 /* struct btrfs_file_extent_item */ 1685 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 1686 1687 static inline unsigned long 1688 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 1689 { 1690 unsigned long offset = (unsigned long)e; 1691 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); 1692 return offset; 1693 } 1694 1695 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 1696 { 1697 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; 1698 } 1699 1700 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 1701 disk_bytenr, 64); 1702 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 1703 generation, 64); 1704 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 1705 disk_num_bytes, 64); 1706 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 1707 offset, 64); 1708 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 1709 num_bytes, 64); 1710 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 1711 ram_bytes, 64); 1712 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 1713 compression, 8); 1714 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 1715 encryption, 8); 1716 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 1717 other_encoding, 16); 1718 1719 /* this returns the number of file bytes represented by the inline item. 1720 * If an item is compressed, this is the uncompressed size 1721 */ 1722 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 1723 struct btrfs_file_extent_item *e) 1724 { 1725 return btrfs_file_extent_ram_bytes(eb, e); 1726 } 1727 1728 /* 1729 * this returns the number of bytes used by the item on disk, minus the 1730 * size of any extent headers. If a file is compressed on disk, this is 1731 * the compressed size 1732 */ 1733 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 1734 struct btrfs_item *e) 1735 { 1736 unsigned long offset; 1737 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); 1738 return btrfs_item_size(eb, e) - offset; 1739 } 1740 1741 static inline struct btrfs_root *btrfs_sb(struct super_block *sb) 1742 { 1743 return sb->s_fs_info; 1744 } 1745 1746 static inline int btrfs_set_root_name(struct btrfs_root *root, 1747 const char *name, int len) 1748 { 1749 /* if we already have a name just free it */ 1750 kfree(root->name); 1751 1752 root->name = kmalloc(len+1, GFP_KERNEL); 1753 if (!root->name) 1754 return -ENOMEM; 1755 1756 memcpy(root->name, name, len); 1757 root->name[len] = '\0'; 1758 1759 return 0; 1760 } 1761 1762 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) 1763 { 1764 if (level == 0) 1765 return root->leafsize; 1766 return root->nodesize; 1767 } 1768 1769 /* helper function to cast into the data area of the leaf. */ 1770 #define btrfs_item_ptr(leaf, slot, type) \ 1771 ((type *)(btrfs_leaf_data(leaf) + \ 1772 btrfs_item_offset_nr(leaf, slot))) 1773 1774 #define btrfs_item_ptr_offset(leaf, slot) \ 1775 ((unsigned long)(btrfs_leaf_data(leaf) + \ 1776 btrfs_item_offset_nr(leaf, slot))) 1777 1778 static inline struct dentry *fdentry(struct file *file) 1779 { 1780 return file->f_path.dentry; 1781 } 1782 1783 /* extent-tree.c */ 1784 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 1785 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 1786 struct btrfs_root *root, unsigned long count); 1787 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); 1788 int btrfs_update_pinned_extents(struct btrfs_root *root, 1789 u64 bytenr, u64 num, int pin); 1790 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, 1791 struct btrfs_root *root, struct extent_buffer *leaf); 1792 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 1793 struct btrfs_root *root, u64 objectid, u64 bytenr); 1794 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy); 1795 struct btrfs_block_group_cache *btrfs_lookup_block_group( 1796 struct btrfs_fs_info *info, 1797 u64 bytenr); 1798 u64 btrfs_find_block_group(struct btrfs_root *root, 1799 u64 search_start, u64 search_hint, int owner); 1800 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, 1801 struct btrfs_root *root, 1802 u32 blocksize, u64 parent, 1803 u64 root_objectid, 1804 u64 ref_generation, 1805 int level, 1806 u64 hint, 1807 u64 empty_size); 1808 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, 1809 struct btrfs_root *root, 1810 u64 bytenr, u32 blocksize, 1811 int level); 1812 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, 1813 struct btrfs_root *root, 1814 u64 num_bytes, u64 parent, u64 min_bytes, 1815 u64 root_objectid, u64 ref_generation, 1816 u64 owner, u64 empty_size, u64 hint_byte, 1817 u64 search_end, struct btrfs_key *ins, u64 data); 1818 int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, 1819 struct btrfs_root *root, u64 parent, 1820 u64 root_objectid, u64 ref_generation, 1821 u64 owner, struct btrfs_key *ins); 1822 int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, 1823 struct btrfs_root *root, u64 parent, 1824 u64 root_objectid, u64 ref_generation, 1825 u64 owner, struct btrfs_key *ins); 1826 int btrfs_reserve_extent(struct btrfs_trans_handle *trans, 1827 struct btrfs_root *root, 1828 u64 num_bytes, u64 min_alloc_size, 1829 u64 empty_size, u64 hint_byte, 1830 u64 search_end, struct btrfs_key *ins, 1831 u64 data); 1832 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1833 struct extent_buffer *orig_buf, struct extent_buffer *buf, 1834 u32 *nr_extents); 1835 int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1836 struct extent_buffer *buf, u32 nr_extents); 1837 int btrfs_update_ref(struct btrfs_trans_handle *trans, 1838 struct btrfs_root *root, struct extent_buffer *orig_buf, 1839 struct extent_buffer *buf, int start_slot, int nr); 1840 int btrfs_free_extent(struct btrfs_trans_handle *trans, 1841 struct btrfs_root *root, 1842 u64 bytenr, u64 num_bytes, u64 parent, 1843 u64 root_objectid, u64 ref_generation, 1844 u64 owner_objectid, int pin); 1845 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 1846 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 1847 struct btrfs_root *root, 1848 struct extent_io_tree *unpin); 1849 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 1850 struct btrfs_root *root, 1851 u64 bytenr, u64 num_bytes, u64 parent, 1852 u64 root_objectid, u64 ref_generation, 1853 u64 owner_objectid); 1854 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, 1855 struct btrfs_root *root, u64 bytenr, u64 num_bytes, 1856 u64 orig_parent, u64 parent, 1857 u64 root_objectid, u64 ref_generation, 1858 u64 owner_objectid); 1859 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 1860 struct btrfs_root *root); 1861 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 1862 int btrfs_free_block_groups(struct btrfs_fs_info *info); 1863 int btrfs_read_block_groups(struct btrfs_root *root); 1864 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 1865 struct btrfs_root *root, u64 bytes_used, 1866 u64 type, u64 chunk_objectid, u64 chunk_offset, 1867 u64 size); 1868 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 1869 struct btrfs_root *root, u64 group_start); 1870 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 1871 int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, 1872 struct btrfs_root *root); 1873 int btrfs_drop_dead_reloc_roots(struct btrfs_root *root); 1874 int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, 1875 struct btrfs_root *root, 1876 struct extent_buffer *buf, u64 orig_start); 1877 int btrfs_add_dead_reloc_root(struct btrfs_root *root); 1878 int btrfs_cleanup_reloc_trees(struct btrfs_root *root); 1879 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 1880 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); 1881 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); 1882 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 1883 1884 int btrfs_check_metadata_free_space(struct btrfs_root *root); 1885 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, 1886 u64 bytes); 1887 void btrfs_free_reserved_data_space(struct btrfs_root *root, 1888 struct inode *inode, u64 bytes); 1889 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, 1890 u64 bytes); 1891 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, 1892 u64 bytes); 1893 /* ctree.c */ 1894 int btrfs_previous_item(struct btrfs_root *root, 1895 struct btrfs_path *path, u64 min_objectid, 1896 int type); 1897 int btrfs_merge_path(struct btrfs_trans_handle *trans, 1898 struct btrfs_root *root, 1899 struct btrfs_key *node_keys, 1900 u64 *nodes, int lowest_level); 1901 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, 1902 struct btrfs_root *root, struct btrfs_path *path, 1903 struct btrfs_key *new_key); 1904 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 1905 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 1906 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 1907 struct btrfs_key *key, int lowest_level, 1908 int cache_only, u64 min_trans); 1909 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 1910 struct btrfs_key *max_key, 1911 struct btrfs_path *path, int cache_only, 1912 u64 min_trans); 1913 int btrfs_cow_block(struct btrfs_trans_handle *trans, 1914 struct btrfs_root *root, struct extent_buffer *buf, 1915 struct extent_buffer *parent, int parent_slot, 1916 struct extent_buffer **cow_ret); 1917 int btrfs_copy_root(struct btrfs_trans_handle *trans, 1918 struct btrfs_root *root, 1919 struct extent_buffer *buf, 1920 struct extent_buffer **cow_ret, u64 new_root_objectid); 1921 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root 1922 *root, struct btrfs_path *path, u32 data_size); 1923 int btrfs_truncate_item(struct btrfs_trans_handle *trans, 1924 struct btrfs_root *root, 1925 struct btrfs_path *path, 1926 u32 new_size, int from_end); 1927 int btrfs_split_item(struct btrfs_trans_handle *trans, 1928 struct btrfs_root *root, 1929 struct btrfs_path *path, 1930 struct btrfs_key *new_key, 1931 unsigned long split_offset); 1932 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 1933 *root, struct btrfs_key *key, struct btrfs_path *p, int 1934 ins_len, int cow); 1935 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 1936 struct btrfs_root *root, struct extent_buffer *parent, 1937 int start_slot, int cache_only, u64 *last_ret, 1938 struct btrfs_key *progress); 1939 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p); 1940 struct btrfs_path *btrfs_alloc_path(void); 1941 void btrfs_free_path(struct btrfs_path *p); 1942 void btrfs_set_path_blocking(struct btrfs_path *p); 1943 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 1944 1945 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1946 struct btrfs_path *path, int slot, int nr); 1947 int btrfs_del_leaf(struct btrfs_trans_handle *trans, 1948 struct btrfs_root *root, 1949 struct btrfs_path *path, u64 bytenr); 1950 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 1951 struct btrfs_root *root, 1952 struct btrfs_path *path) 1953 { 1954 return btrfs_del_items(trans, root, path, path->slots[0], 1); 1955 } 1956 1957 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 1958 *root, struct btrfs_key *key, void *data, u32 data_size); 1959 int btrfs_insert_some_items(struct btrfs_trans_handle *trans, 1960 struct btrfs_root *root, 1961 struct btrfs_path *path, 1962 struct btrfs_key *cpu_key, u32 *data_size, 1963 int nr); 1964 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 1965 struct btrfs_root *root, 1966 struct btrfs_path *path, 1967 struct btrfs_key *cpu_key, u32 *data_size, int nr); 1968 1969 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 1970 struct btrfs_root *root, 1971 struct btrfs_path *path, 1972 struct btrfs_key *key, 1973 u32 data_size) 1974 { 1975 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 1976 } 1977 1978 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 1979 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 1980 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 1981 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root 1982 *root); 1983 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 1984 struct btrfs_root *root, 1985 struct extent_buffer *node, 1986 struct extent_buffer *parent); 1987 /* root-item.c */ 1988 int btrfs_find_root_ref(struct btrfs_root *tree_root, 1989 struct btrfs_path *path, 1990 u64 root_id, u64 ref_id); 1991 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 1992 struct btrfs_root *tree_root, 1993 u64 root_id, u8 type, u64 ref_id, 1994 u64 dirid, u64 sequence, 1995 const char *name, int name_len); 1996 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1997 struct btrfs_key *key); 1998 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 1999 *root, struct btrfs_key *key, struct btrfs_root_item 2000 *item); 2001 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root 2002 *root, struct btrfs_key *key, struct btrfs_root_item 2003 *item); 2004 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct 2005 btrfs_root_item *item, struct btrfs_key *key); 2006 int btrfs_search_root(struct btrfs_root *root, u64 search_start, 2007 u64 *found_objectid); 2008 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, 2009 struct btrfs_root *latest_root); 2010 /* dir-item.c */ 2011 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2012 struct btrfs_root *root, const char *name, 2013 int name_len, u64 dir, 2014 struct btrfs_key *location, u8 type, u64 index); 2015 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2016 struct btrfs_root *root, 2017 struct btrfs_path *path, u64 dir, 2018 const char *name, int name_len, 2019 int mod); 2020 struct btrfs_dir_item * 2021 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2022 struct btrfs_root *root, 2023 struct btrfs_path *path, u64 dir, 2024 u64 objectid, const char *name, int name_len, 2025 int mod); 2026 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2027 struct btrfs_path *path, 2028 const char *name, int name_len); 2029 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2030 struct btrfs_root *root, 2031 struct btrfs_path *path, 2032 struct btrfs_dir_item *di); 2033 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2034 struct btrfs_root *root, const char *name, 2035 u16 name_len, const void *data, u16 data_len, 2036 u64 dir); 2037 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2038 struct btrfs_root *root, 2039 struct btrfs_path *path, u64 dir, 2040 const char *name, u16 name_len, 2041 int mod); 2042 2043 /* orphan.c */ 2044 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2045 struct btrfs_root *root, u64 offset); 2046 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2047 struct btrfs_root *root, u64 offset); 2048 2049 /* inode-map.c */ 2050 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, 2051 struct btrfs_root *fs_root, 2052 u64 dirid, u64 *objectid); 2053 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid); 2054 2055 /* inode-item.c */ 2056 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2057 struct btrfs_root *root, 2058 const char *name, int name_len, 2059 u64 inode_objectid, u64 ref_objectid, u64 index); 2060 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2061 struct btrfs_root *root, 2062 const char *name, int name_len, 2063 u64 inode_objectid, u64 ref_objectid, u64 *index); 2064 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2065 struct btrfs_root *root, 2066 struct btrfs_path *path, u64 objectid); 2067 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2068 *root, struct btrfs_path *path, 2069 struct btrfs_key *location, int mod); 2070 2071 /* file-item.c */ 2072 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2073 struct btrfs_root *root, u64 bytenr, u64 len); 2074 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 2075 struct bio *bio, u32 *dst); 2076 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2077 struct btrfs_root *root, 2078 u64 objectid, u64 pos, 2079 u64 disk_offset, u64 disk_num_bytes, 2080 u64 num_bytes, u64 offset, u64 ram_bytes, 2081 u8 compression, u8 encryption, u16 other_encoding); 2082 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2083 struct btrfs_root *root, 2084 struct btrfs_path *path, u64 objectid, 2085 u64 bytenr, int mod); 2086 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2087 struct btrfs_root *root, 2088 struct btrfs_ordered_sum *sums); 2089 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 2090 struct bio *bio, u64 file_start, int contig); 2091 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode, 2092 u64 start, unsigned long len); 2093 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, 2094 struct btrfs_root *root, 2095 struct btrfs_path *path, 2096 u64 bytenr, int cow); 2097 int btrfs_csum_truncate(struct btrfs_trans_handle *trans, 2098 struct btrfs_root *root, struct btrfs_path *path, 2099 u64 isize); 2100 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, 2101 u64 end, struct list_head *list); 2102 /* inode.c */ 2103 2104 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 2105 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 2106 #define ClearPageChecked ClearPageFsMisc 2107 #define SetPageChecked SetPageFsMisc 2108 #define PageChecked PageFsMisc 2109 #endif 2110 2111 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2112 int btrfs_set_inode_index(struct inode *dir, u64 *index); 2113 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2114 struct btrfs_root *root, 2115 struct inode *dir, struct inode *inode, 2116 const char *name, int name_len); 2117 int btrfs_add_link(struct btrfs_trans_handle *trans, 2118 struct inode *parent_inode, struct inode *inode, 2119 const char *name, int name_len, int add_backref, u64 index); 2120 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 2121 struct btrfs_root *root, 2122 struct inode *inode, u64 new_size, 2123 u32 min_type); 2124 2125 int btrfs_start_delalloc_inodes(struct btrfs_root *root); 2126 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end); 2127 int btrfs_writepages(struct address_space *mapping, 2128 struct writeback_control *wbc); 2129 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 2130 struct btrfs_root *new_root, struct dentry *dentry, 2131 u64 new_dirid, u64 alloc_hint); 2132 int btrfs_merge_bio_hook(struct page *page, unsigned long offset, 2133 size_t size, struct bio *bio, unsigned long bio_flags); 2134 2135 unsigned long btrfs_force_ra(struct address_space *mapping, 2136 struct file_ra_state *ra, struct file *file, 2137 pgoff_t offset, pgoff_t last_index); 2138 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2139 int btrfs_readpage(struct file *file, struct page *page); 2140 void btrfs_delete_inode(struct inode *inode); 2141 void btrfs_put_inode(struct inode *inode); 2142 void btrfs_read_locked_inode(struct inode *inode); 2143 int btrfs_write_inode(struct inode *inode, int wait); 2144 void btrfs_dirty_inode(struct inode *inode); 2145 struct inode *btrfs_alloc_inode(struct super_block *sb); 2146 void btrfs_destroy_inode(struct inode *inode); 2147 int btrfs_init_cachep(void); 2148 void btrfs_destroy_cachep(void); 2149 long btrfs_ioctl_trans_end(struct file *file); 2150 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, 2151 struct btrfs_root *root, int wait); 2152 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, 2153 struct btrfs_root *root); 2154 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 2155 struct btrfs_root *root, int *is_new); 2156 int btrfs_commit_write(struct file *file, struct page *page, 2157 unsigned from, unsigned to); 2158 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 2159 size_t page_offset, u64 start, u64 end, 2160 int create); 2161 int btrfs_update_inode(struct btrfs_trans_handle *trans, 2162 struct btrfs_root *root, 2163 struct inode *inode); 2164 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 2165 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); 2166 void btrfs_orphan_cleanup(struct btrfs_root *root); 2167 int btrfs_cont_expand(struct inode *inode, loff_t size); 2168 2169 /* ioctl.c */ 2170 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2171 2172 /* file.c */ 2173 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync); 2174 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 2175 int skip_pinned); 2176 int btrfs_check_file(struct btrfs_root *root, struct inode *inode); 2177 extern struct file_operations btrfs_file_operations; 2178 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 2179 struct btrfs_root *root, struct inode *inode, 2180 u64 start, u64 end, u64 locked_end, 2181 u64 inline_limit, u64 *hint_block); 2182 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 2183 struct btrfs_root *root, 2184 struct inode *inode, u64 start, u64 end); 2185 int btrfs_release_file(struct inode *inode, struct file *file); 2186 2187 /* tree-defrag.c */ 2188 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 2189 struct btrfs_root *root, int cache_only); 2190 2191 /* sysfs.c */ 2192 int btrfs_init_sysfs(void); 2193 void btrfs_exit_sysfs(void); 2194 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs); 2195 int btrfs_sysfs_add_root(struct btrfs_root *root); 2196 void btrfs_sysfs_del_root(struct btrfs_root *root); 2197 void btrfs_sysfs_del_super(struct btrfs_fs_info *root); 2198 2199 /* xattr.c */ 2200 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 2201 2202 /* super.c */ 2203 u64 btrfs_parse_size(char *str); 2204 int btrfs_parse_options(struct btrfs_root *root, char *options); 2205 int btrfs_sync_fs(struct super_block *sb, int wait); 2206 2207 /* acl.c */ 2208 int btrfs_check_acl(struct inode *inode, int mask); 2209 int btrfs_init_acl(struct inode *inode, struct inode *dir); 2210 int btrfs_acl_chmod(struct inode *inode); 2211 2212 #endif 2213