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 void *bdev_holder; 885 }; 886 887 /* 888 * in ram representation of the tree. extent_root is used for all allocations 889 * and for the extent tree extent_root root. 890 */ 891 struct btrfs_dirty_root; 892 struct btrfs_root { 893 struct extent_buffer *node; 894 895 /* the node lock is held while changing the node pointer */ 896 spinlock_t node_lock; 897 898 struct extent_buffer *commit_root; 899 struct btrfs_leaf_ref_tree *ref_tree; 900 struct btrfs_leaf_ref_tree ref_tree_struct; 901 struct btrfs_dirty_root *dirty_root; 902 struct btrfs_root *log_root; 903 struct btrfs_root *reloc_root; 904 905 struct btrfs_root_item root_item; 906 struct btrfs_key root_key; 907 struct btrfs_fs_info *fs_info; 908 struct extent_io_tree dirty_log_pages; 909 910 struct kobject root_kobj; 911 struct completion kobj_unregister; 912 struct mutex objectid_mutex; 913 914 struct mutex log_mutex; 915 wait_queue_head_t log_writer_wait; 916 wait_queue_head_t log_commit_wait[2]; 917 atomic_t log_writers; 918 atomic_t log_commit[2]; 919 unsigned long log_transid; 920 unsigned long log_batch; 921 922 u64 objectid; 923 u64 last_trans; 924 925 /* data allocations are done in sectorsize units */ 926 u32 sectorsize; 927 928 /* node allocations are done in nodesize units */ 929 u32 nodesize; 930 931 /* leaf allocations are done in leafsize units */ 932 u32 leafsize; 933 934 u32 stripesize; 935 936 u32 type; 937 u64 highest_inode; 938 u64 last_inode_alloc; 939 int ref_cows; 940 int track_dirty; 941 u64 defrag_trans_start; 942 struct btrfs_key defrag_progress; 943 struct btrfs_key defrag_max; 944 int defrag_running; 945 int defrag_level; 946 char *name; 947 int in_sysfs; 948 949 /* the dirty list is only used by non-reference counted roots */ 950 struct list_head dirty_list; 951 952 spinlock_t list_lock; 953 struct list_head dead_list; 954 struct list_head orphan_list; 955 956 /* 957 * right now this just gets used so that a root has its own devid 958 * for stat. It may be used for more later 959 */ 960 struct super_block anon_super; 961 }; 962 963 /* 964 * inode items have the data typically returned from stat and store other 965 * info about object characteristics. There is one for every file and dir in 966 * the FS 967 */ 968 #define BTRFS_INODE_ITEM_KEY 1 969 #define BTRFS_INODE_REF_KEY 12 970 #define BTRFS_XATTR_ITEM_KEY 24 971 #define BTRFS_ORPHAN_ITEM_KEY 48 972 /* reserve 2-15 close to the inode for later flexibility */ 973 974 /* 975 * dir items are the name -> inode pointers in a directory. There is one 976 * for every name in a directory. 977 */ 978 #define BTRFS_DIR_LOG_ITEM_KEY 60 979 #define BTRFS_DIR_LOG_INDEX_KEY 72 980 #define BTRFS_DIR_ITEM_KEY 84 981 #define BTRFS_DIR_INDEX_KEY 96 982 /* 983 * extent data is for file data 984 */ 985 #define BTRFS_EXTENT_DATA_KEY 108 986 987 /* 988 * extent csums are stored in a separate tree and hold csums for 989 * an entire extent on disk. 990 */ 991 #define BTRFS_EXTENT_CSUM_KEY 128 992 993 /* 994 * root items point to tree roots. They are typically in the root 995 * tree used by the super block to find all the other trees 996 */ 997 #define BTRFS_ROOT_ITEM_KEY 132 998 999 /* 1000 * root backrefs tie subvols and snapshots to the directory entries that 1001 * reference them 1002 */ 1003 #define BTRFS_ROOT_BACKREF_KEY 144 1004 1005 /* 1006 * root refs make a fast index for listing all of the snapshots and 1007 * subvolumes referenced by a given root. They point directly to the 1008 * directory item in the root that references the subvol 1009 */ 1010 #define BTRFS_ROOT_REF_KEY 156 1011 1012 /* 1013 * extent items are in the extent map tree. These record which blocks 1014 * are used, and how many references there are to each block 1015 */ 1016 #define BTRFS_EXTENT_ITEM_KEY 168 1017 #define BTRFS_EXTENT_REF_KEY 180 1018 1019 /* 1020 * block groups give us hints into the extent allocation trees. Which 1021 * blocks are free etc etc 1022 */ 1023 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 1024 1025 #define BTRFS_DEV_EXTENT_KEY 204 1026 #define BTRFS_DEV_ITEM_KEY 216 1027 #define BTRFS_CHUNK_ITEM_KEY 228 1028 1029 /* 1030 * string items are for debugging. They just store a short string of 1031 * data in the FS 1032 */ 1033 #define BTRFS_STRING_ITEM_KEY 253 1034 1035 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1036 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1037 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1038 #define BTRFS_MOUNT_SSD (1 << 3) 1039 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1040 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1041 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1042 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1043 1044 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1045 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1046 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 1047 BTRFS_MOUNT_##opt) 1048 /* 1049 * Inode flags 1050 */ 1051 #define BTRFS_INODE_NODATASUM (1 << 0) 1052 #define BTRFS_INODE_NODATACOW (1 << 1) 1053 #define BTRFS_INODE_READONLY (1 << 2) 1054 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 1055 #define BTRFS_INODE_PREALLOC (1 << 4) 1056 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \ 1057 ~BTRFS_INODE_##flag) 1058 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \ 1059 BTRFS_INODE_##flag) 1060 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \ 1061 BTRFS_INODE_##flag) 1062 /* some macros to generate set/get funcs for the struct fields. This 1063 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 1064 * one for u8: 1065 */ 1066 #define le8_to_cpu(v) (v) 1067 #define cpu_to_le8(v) (v) 1068 #define __le8 u8 1069 1070 #define read_eb_member(eb, ptr, type, member, result) ( \ 1071 read_extent_buffer(eb, (char *)(result), \ 1072 ((unsigned long)(ptr)) + \ 1073 offsetof(type, member), \ 1074 sizeof(((type *)0)->member))) 1075 1076 #define write_eb_member(eb, ptr, type, member, result) ( \ 1077 write_extent_buffer(eb, (char *)(result), \ 1078 ((unsigned long)(ptr)) + \ 1079 offsetof(type, member), \ 1080 sizeof(((type *)0)->member))) 1081 1082 #ifndef BTRFS_SETGET_FUNCS 1083 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 1084 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \ 1085 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val); 1086 #endif 1087 1088 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 1089 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 1090 { \ 1091 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1092 u##bits res = le##bits##_to_cpu(p->member); \ 1093 kunmap_atomic(p, KM_USER0); \ 1094 return res; \ 1095 } \ 1096 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 1097 u##bits val) \ 1098 { \ 1099 type *p = kmap_atomic(eb->first_page, KM_USER0); \ 1100 p->member = cpu_to_le##bits(val); \ 1101 kunmap_atomic(p, KM_USER0); \ 1102 } 1103 1104 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 1105 static inline u##bits btrfs_##name(type *s) \ 1106 { \ 1107 return le##bits##_to_cpu(s->member); \ 1108 } \ 1109 static inline void btrfs_set_##name(type *s, u##bits val) \ 1110 { \ 1111 s->member = cpu_to_le##bits(val); \ 1112 } 1113 1114 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 1115 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 1116 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 1117 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 1118 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 1119 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 1120 start_offset, 64); 1121 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 1122 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 1123 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 1124 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 1125 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 1126 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 1127 1128 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 1129 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 1130 total_bytes, 64); 1131 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 1132 bytes_used, 64); 1133 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 1134 io_align, 32); 1135 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 1136 io_width, 32); 1137 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 1138 sector_size, 32); 1139 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 1140 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 1141 dev_group, 32); 1142 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 1143 seek_speed, 8); 1144 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 1145 bandwidth, 8); 1146 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 1147 generation, 64); 1148 1149 static inline char *btrfs_device_uuid(struct btrfs_dev_item *d) 1150 { 1151 return (char *)d + offsetof(struct btrfs_dev_item, uuid); 1152 } 1153 1154 static inline char *btrfs_device_fsid(struct btrfs_dev_item *d) 1155 { 1156 return (char *)d + offsetof(struct btrfs_dev_item, fsid); 1157 } 1158 1159 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 1160 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 1161 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 1162 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 1163 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 1164 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 1165 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 1166 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 1167 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 1168 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 1169 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 1170 1171 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 1172 { 1173 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 1174 } 1175 1176 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 1177 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 1178 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 1179 stripe_len, 64); 1180 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 1181 io_align, 32); 1182 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 1183 io_width, 32); 1184 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 1185 sector_size, 32); 1186 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 1187 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 1188 num_stripes, 16); 1189 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 1190 sub_stripes, 16); 1191 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 1192 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 1193 1194 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 1195 int nr) 1196 { 1197 unsigned long offset = (unsigned long)c; 1198 offset += offsetof(struct btrfs_chunk, stripe); 1199 offset += nr * sizeof(struct btrfs_stripe); 1200 return (struct btrfs_stripe *)offset; 1201 } 1202 1203 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 1204 { 1205 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 1206 } 1207 1208 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 1209 struct btrfs_chunk *c, int nr) 1210 { 1211 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 1212 } 1213 1214 static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb, 1215 struct btrfs_chunk *c, int nr, 1216 u64 val) 1217 { 1218 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val); 1219 } 1220 1221 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 1222 struct btrfs_chunk *c, int nr) 1223 { 1224 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 1225 } 1226 1227 static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb, 1228 struct btrfs_chunk *c, int nr, 1229 u64 val) 1230 { 1231 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val); 1232 } 1233 1234 /* struct btrfs_block_group_item */ 1235 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 1236 used, 64); 1237 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 1238 used, 64); 1239 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 1240 struct btrfs_block_group_item, chunk_objectid, 64); 1241 1242 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 1243 struct btrfs_block_group_item, chunk_objectid, 64); 1244 BTRFS_SETGET_FUNCS(disk_block_group_flags, 1245 struct btrfs_block_group_item, flags, 64); 1246 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 1247 struct btrfs_block_group_item, flags, 64); 1248 1249 /* struct btrfs_inode_ref */ 1250 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 1251 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 1252 1253 /* struct btrfs_inode_item */ 1254 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 1255 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 1256 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 1257 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 1258 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 1259 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 1260 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 1261 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 1262 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 1263 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 1264 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 1265 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 1266 1267 static inline struct btrfs_timespec * 1268 btrfs_inode_atime(struct btrfs_inode_item *inode_item) 1269 { 1270 unsigned long ptr = (unsigned long)inode_item; 1271 ptr += offsetof(struct btrfs_inode_item, atime); 1272 return (struct btrfs_timespec *)ptr; 1273 } 1274 1275 static inline struct btrfs_timespec * 1276 btrfs_inode_mtime(struct btrfs_inode_item *inode_item) 1277 { 1278 unsigned long ptr = (unsigned long)inode_item; 1279 ptr += offsetof(struct btrfs_inode_item, mtime); 1280 return (struct btrfs_timespec *)ptr; 1281 } 1282 1283 static inline struct btrfs_timespec * 1284 btrfs_inode_ctime(struct btrfs_inode_item *inode_item) 1285 { 1286 unsigned long ptr = (unsigned long)inode_item; 1287 ptr += offsetof(struct btrfs_inode_item, ctime); 1288 return (struct btrfs_timespec *)ptr; 1289 } 1290 1291 static inline struct btrfs_timespec * 1292 btrfs_inode_otime(struct btrfs_inode_item *inode_item) 1293 { 1294 unsigned long ptr = (unsigned long)inode_item; 1295 ptr += offsetof(struct btrfs_inode_item, otime); 1296 return (struct btrfs_timespec *)ptr; 1297 } 1298 1299 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 1300 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 1301 1302 /* struct btrfs_dev_extent */ 1303 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 1304 chunk_tree, 64); 1305 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 1306 chunk_objectid, 64); 1307 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 1308 chunk_offset, 64); 1309 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 1310 1311 static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 1312 { 1313 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 1314 return (u8 *)((unsigned long)dev + ptr); 1315 } 1316 1317 /* struct btrfs_extent_ref */ 1318 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64); 1319 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64); 1320 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64); 1321 BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32); 1322 1323 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64); 1324 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref, 1325 generation, 64); 1326 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref, 1327 objectid, 64); 1328 BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref, 1329 num_refs, 32); 1330 1331 /* struct btrfs_extent_item */ 1332 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32); 1333 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item, 1334 refs, 32); 1335 1336 /* struct btrfs_node */ 1337 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 1338 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 1339 1340 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 1341 { 1342 unsigned long ptr; 1343 ptr = offsetof(struct btrfs_node, ptrs) + 1344 sizeof(struct btrfs_key_ptr) * nr; 1345 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 1346 } 1347 1348 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 1349 int nr, u64 val) 1350 { 1351 unsigned long ptr; 1352 ptr = offsetof(struct btrfs_node, ptrs) + 1353 sizeof(struct btrfs_key_ptr) * nr; 1354 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 1355 } 1356 1357 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 1358 { 1359 unsigned long ptr; 1360 ptr = offsetof(struct btrfs_node, ptrs) + 1361 sizeof(struct btrfs_key_ptr) * nr; 1362 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 1363 } 1364 1365 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 1366 int nr, u64 val) 1367 { 1368 unsigned long ptr; 1369 ptr = offsetof(struct btrfs_node, ptrs) + 1370 sizeof(struct btrfs_key_ptr) * nr; 1371 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 1372 } 1373 1374 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 1375 { 1376 return offsetof(struct btrfs_node, ptrs) + 1377 sizeof(struct btrfs_key_ptr) * nr; 1378 } 1379 1380 void btrfs_node_key(struct extent_buffer *eb, 1381 struct btrfs_disk_key *disk_key, int nr); 1382 1383 static inline void btrfs_set_node_key(struct extent_buffer *eb, 1384 struct btrfs_disk_key *disk_key, int nr) 1385 { 1386 unsigned long ptr; 1387 ptr = btrfs_node_key_ptr_offset(nr); 1388 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 1389 struct btrfs_key_ptr, key, disk_key); 1390 } 1391 1392 /* struct btrfs_item */ 1393 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 1394 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 1395 1396 static inline unsigned long btrfs_item_nr_offset(int nr) 1397 { 1398 return offsetof(struct btrfs_leaf, items) + 1399 sizeof(struct btrfs_item) * nr; 1400 } 1401 1402 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, 1403 int nr) 1404 { 1405 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 1406 } 1407 1408 static inline u32 btrfs_item_end(struct extent_buffer *eb, 1409 struct btrfs_item *item) 1410 { 1411 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 1412 } 1413 1414 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 1415 { 1416 return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); 1417 } 1418 1419 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 1420 { 1421 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); 1422 } 1423 1424 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 1425 { 1426 return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); 1427 } 1428 1429 static inline void btrfs_item_key(struct extent_buffer *eb, 1430 struct btrfs_disk_key *disk_key, int nr) 1431 { 1432 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1433 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 1434 } 1435 1436 static inline void btrfs_set_item_key(struct extent_buffer *eb, 1437 struct btrfs_disk_key *disk_key, int nr) 1438 { 1439 struct btrfs_item *item = btrfs_item_nr(eb, nr); 1440 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 1441 } 1442 1443 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 1444 1445 /* 1446 * struct btrfs_root_ref 1447 */ 1448 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 1449 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 1450 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 1451 1452 /* struct btrfs_dir_item */ 1453 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 1454 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 1455 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 1456 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 1457 1458 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 1459 struct btrfs_dir_item *item, 1460 struct btrfs_disk_key *key) 1461 { 1462 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 1463 } 1464 1465 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 1466 struct btrfs_dir_item *item, 1467 struct btrfs_disk_key *key) 1468 { 1469 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 1470 } 1471 1472 /* struct btrfs_disk_key */ 1473 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 1474 objectid, 64); 1475 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 1476 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 1477 1478 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 1479 struct btrfs_disk_key *disk) 1480 { 1481 cpu->offset = le64_to_cpu(disk->offset); 1482 cpu->type = disk->type; 1483 cpu->objectid = le64_to_cpu(disk->objectid); 1484 } 1485 1486 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 1487 struct btrfs_key *cpu) 1488 { 1489 disk->offset = cpu_to_le64(cpu->offset); 1490 disk->type = cpu->type; 1491 disk->objectid = cpu_to_le64(cpu->objectid); 1492 } 1493 1494 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 1495 struct btrfs_key *key, int nr) 1496 { 1497 struct btrfs_disk_key disk_key; 1498 btrfs_node_key(eb, &disk_key, nr); 1499 btrfs_disk_key_to_cpu(key, &disk_key); 1500 } 1501 1502 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 1503 struct btrfs_key *key, int nr) 1504 { 1505 struct btrfs_disk_key disk_key; 1506 btrfs_item_key(eb, &disk_key, nr); 1507 btrfs_disk_key_to_cpu(key, &disk_key); 1508 } 1509 1510 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 1511 struct btrfs_dir_item *item, 1512 struct btrfs_key *key) 1513 { 1514 struct btrfs_disk_key disk_key; 1515 btrfs_dir_item_key(eb, item, &disk_key); 1516 btrfs_disk_key_to_cpu(key, &disk_key); 1517 } 1518 1519 1520 static inline u8 btrfs_key_type(struct btrfs_key *key) 1521 { 1522 return key->type; 1523 } 1524 1525 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 1526 { 1527 key->type = val; 1528 } 1529 1530 /* struct btrfs_header */ 1531 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 1532 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 1533 generation, 64); 1534 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 1535 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 1536 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 1537 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 1538 1539 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 1540 { 1541 return (btrfs_header_flags(eb) & flag) == flag; 1542 } 1543 1544 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 1545 { 1546 u64 flags = btrfs_header_flags(eb); 1547 btrfs_set_header_flags(eb, flags | flag); 1548 return (flags & flag) == flag; 1549 } 1550 1551 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 1552 { 1553 u64 flags = btrfs_header_flags(eb); 1554 btrfs_set_header_flags(eb, flags & ~flag); 1555 return (flags & flag) == flag; 1556 } 1557 1558 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb) 1559 { 1560 unsigned long ptr = offsetof(struct btrfs_header, fsid); 1561 return (u8 *)ptr; 1562 } 1563 1564 static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 1565 { 1566 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid); 1567 return (u8 *)ptr; 1568 } 1569 1570 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb) 1571 { 1572 unsigned long ptr = offsetof(struct btrfs_super_block, fsid); 1573 return (u8 *)ptr; 1574 } 1575 1576 static inline u8 *btrfs_header_csum(struct extent_buffer *eb) 1577 { 1578 unsigned long ptr = offsetof(struct btrfs_header, csum); 1579 return (u8 *)ptr; 1580 } 1581 1582 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb) 1583 { 1584 return NULL; 1585 } 1586 1587 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb) 1588 { 1589 return NULL; 1590 } 1591 1592 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb) 1593 { 1594 return NULL; 1595 } 1596 1597 static inline int btrfs_is_leaf(struct extent_buffer *eb) 1598 { 1599 return btrfs_header_level(eb) == 0; 1600 } 1601 1602 /* struct btrfs_root_item */ 1603 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 1604 generation, 64); 1605 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 1606 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 1607 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 1608 1609 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 1610 generation, 64); 1611 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 1612 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 1613 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 1614 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 1615 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 1616 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 1617 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 1618 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 1619 last_snapshot, 64); 1620 1621 /* struct btrfs_super_block */ 1622 1623 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 1624 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 1625 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 1626 generation, 64); 1627 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 1628 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 1629 struct btrfs_super_block, sys_chunk_array_size, 32); 1630 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 1631 struct btrfs_super_block, chunk_root_generation, 64); 1632 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 1633 root_level, 8); 1634 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 1635 chunk_root, 64); 1636 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 1637 chunk_root_level, 8); 1638 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 1639 log_root, 64); 1640 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 1641 log_root_transid, 64); 1642 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 1643 log_root_level, 8); 1644 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 1645 total_bytes, 64); 1646 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 1647 bytes_used, 64); 1648 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 1649 sectorsize, 32); 1650 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 1651 nodesize, 32); 1652 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, 1653 leafsize, 32); 1654 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 1655 stripesize, 32); 1656 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 1657 root_dir_objectid, 64); 1658 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 1659 num_devices, 64); 1660 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 1661 compat_flags, 64); 1662 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 1663 compat_flags, 64); 1664 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 1665 incompat_flags, 64); 1666 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 1667 csum_type, 16); 1668 1669 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 1670 { 1671 int t = btrfs_super_csum_type(s); 1672 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes)); 1673 return btrfs_csum_sizes[t]; 1674 } 1675 1676 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 1677 { 1678 return offsetof(struct btrfs_leaf, items); 1679 } 1680 1681 /* struct btrfs_file_extent_item */ 1682 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 1683 1684 static inline unsigned long 1685 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 1686 { 1687 unsigned long offset = (unsigned long)e; 1688 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); 1689 return offset; 1690 } 1691 1692 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 1693 { 1694 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; 1695 } 1696 1697 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 1698 disk_bytenr, 64); 1699 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 1700 generation, 64); 1701 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 1702 disk_num_bytes, 64); 1703 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 1704 offset, 64); 1705 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 1706 num_bytes, 64); 1707 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 1708 ram_bytes, 64); 1709 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 1710 compression, 8); 1711 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 1712 encryption, 8); 1713 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 1714 other_encoding, 16); 1715 1716 /* this returns the number of file bytes represented by the inline item. 1717 * If an item is compressed, this is the uncompressed size 1718 */ 1719 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 1720 struct btrfs_file_extent_item *e) 1721 { 1722 return btrfs_file_extent_ram_bytes(eb, e); 1723 } 1724 1725 /* 1726 * this returns the number of bytes used by the item on disk, minus the 1727 * size of any extent headers. If a file is compressed on disk, this is 1728 * the compressed size 1729 */ 1730 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 1731 struct btrfs_item *e) 1732 { 1733 unsigned long offset; 1734 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); 1735 return btrfs_item_size(eb, e) - offset; 1736 } 1737 1738 static inline struct btrfs_root *btrfs_sb(struct super_block *sb) 1739 { 1740 return sb->s_fs_info; 1741 } 1742 1743 static inline int btrfs_set_root_name(struct btrfs_root *root, 1744 const char *name, int len) 1745 { 1746 /* if we already have a name just free it */ 1747 kfree(root->name); 1748 1749 root->name = kmalloc(len+1, GFP_KERNEL); 1750 if (!root->name) 1751 return -ENOMEM; 1752 1753 memcpy(root->name, name, len); 1754 root->name[len] = '\0'; 1755 1756 return 0; 1757 } 1758 1759 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) 1760 { 1761 if (level == 0) 1762 return root->leafsize; 1763 return root->nodesize; 1764 } 1765 1766 /* helper function to cast into the data area of the leaf. */ 1767 #define btrfs_item_ptr(leaf, slot, type) \ 1768 ((type *)(btrfs_leaf_data(leaf) + \ 1769 btrfs_item_offset_nr(leaf, slot))) 1770 1771 #define btrfs_item_ptr_offset(leaf, slot) \ 1772 ((unsigned long)(btrfs_leaf_data(leaf) + \ 1773 btrfs_item_offset_nr(leaf, slot))) 1774 1775 static inline struct dentry *fdentry(struct file *file) 1776 { 1777 return file->f_path.dentry; 1778 } 1779 1780 /* extent-tree.c */ 1781 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 1782 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 1783 struct btrfs_root *root, unsigned long count); 1784 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); 1785 int btrfs_update_pinned_extents(struct btrfs_root *root, 1786 u64 bytenr, u64 num, int pin); 1787 int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans, 1788 struct btrfs_root *root, struct extent_buffer *leaf); 1789 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 1790 struct btrfs_root *root, u64 objectid, u64 bytenr); 1791 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy); 1792 struct btrfs_block_group_cache *btrfs_lookup_block_group( 1793 struct btrfs_fs_info *info, 1794 u64 bytenr); 1795 u64 btrfs_find_block_group(struct btrfs_root *root, 1796 u64 search_start, u64 search_hint, int owner); 1797 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, 1798 struct btrfs_root *root, 1799 u32 blocksize, u64 parent, 1800 u64 root_objectid, 1801 u64 ref_generation, 1802 int level, 1803 u64 hint, 1804 u64 empty_size); 1805 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans, 1806 struct btrfs_root *root, 1807 u64 bytenr, u32 blocksize, 1808 int level); 1809 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, 1810 struct btrfs_root *root, 1811 u64 num_bytes, u64 parent, u64 min_bytes, 1812 u64 root_objectid, u64 ref_generation, 1813 u64 owner, u64 empty_size, u64 hint_byte, 1814 u64 search_end, struct btrfs_key *ins, u64 data); 1815 int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans, 1816 struct btrfs_root *root, u64 parent, 1817 u64 root_objectid, u64 ref_generation, 1818 u64 owner, struct btrfs_key *ins); 1819 int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans, 1820 struct btrfs_root *root, u64 parent, 1821 u64 root_objectid, u64 ref_generation, 1822 u64 owner, struct btrfs_key *ins); 1823 int btrfs_reserve_extent(struct btrfs_trans_handle *trans, 1824 struct btrfs_root *root, 1825 u64 num_bytes, u64 min_alloc_size, 1826 u64 empty_size, u64 hint_byte, 1827 u64 search_end, struct btrfs_key *ins, 1828 u64 data); 1829 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1830 struct extent_buffer *orig_buf, struct extent_buffer *buf, 1831 u32 *nr_extents); 1832 int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1833 struct extent_buffer *buf, u32 nr_extents); 1834 int btrfs_update_ref(struct btrfs_trans_handle *trans, 1835 struct btrfs_root *root, struct extent_buffer *orig_buf, 1836 struct extent_buffer *buf, int start_slot, int nr); 1837 int btrfs_free_extent(struct btrfs_trans_handle *trans, 1838 struct btrfs_root *root, 1839 u64 bytenr, u64 num_bytes, u64 parent, 1840 u64 root_objectid, u64 ref_generation, 1841 u64 owner_objectid, int pin); 1842 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 1843 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 1844 struct btrfs_root *root, 1845 struct extent_io_tree *unpin); 1846 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 1847 struct btrfs_root *root, 1848 u64 bytenr, u64 num_bytes, u64 parent, 1849 u64 root_objectid, u64 ref_generation, 1850 u64 owner_objectid); 1851 int btrfs_update_extent_ref(struct btrfs_trans_handle *trans, 1852 struct btrfs_root *root, u64 bytenr, u64 num_bytes, 1853 u64 orig_parent, u64 parent, 1854 u64 root_objectid, u64 ref_generation, 1855 u64 owner_objectid); 1856 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 1857 struct btrfs_root *root); 1858 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 1859 int btrfs_free_block_groups(struct btrfs_fs_info *info); 1860 int btrfs_read_block_groups(struct btrfs_root *root); 1861 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 1862 struct btrfs_root *root, u64 bytes_used, 1863 u64 type, u64 chunk_objectid, u64 chunk_offset, 1864 u64 size); 1865 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 1866 struct btrfs_root *root, u64 group_start); 1867 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 1868 int btrfs_free_reloc_root(struct btrfs_trans_handle *trans, 1869 struct btrfs_root *root); 1870 int btrfs_drop_dead_reloc_roots(struct btrfs_root *root); 1871 int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans, 1872 struct btrfs_root *root, 1873 struct extent_buffer *buf, u64 orig_start); 1874 int btrfs_add_dead_reloc_root(struct btrfs_root *root); 1875 int btrfs_cleanup_reloc_trees(struct btrfs_root *root); 1876 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 1877 u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags); 1878 void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde); 1879 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 1880 1881 int btrfs_check_metadata_free_space(struct btrfs_root *root); 1882 int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode, 1883 u64 bytes); 1884 void btrfs_free_reserved_data_space(struct btrfs_root *root, 1885 struct inode *inode, u64 bytes); 1886 void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode, 1887 u64 bytes); 1888 void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode, 1889 u64 bytes); 1890 /* ctree.c */ 1891 int btrfs_previous_item(struct btrfs_root *root, 1892 struct btrfs_path *path, u64 min_objectid, 1893 int type); 1894 int btrfs_merge_path(struct btrfs_trans_handle *trans, 1895 struct btrfs_root *root, 1896 struct btrfs_key *node_keys, 1897 u64 *nodes, int lowest_level); 1898 int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans, 1899 struct btrfs_root *root, struct btrfs_path *path, 1900 struct btrfs_key *new_key); 1901 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 1902 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 1903 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 1904 struct btrfs_key *key, int lowest_level, 1905 int cache_only, u64 min_trans); 1906 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 1907 struct btrfs_key *max_key, 1908 struct btrfs_path *path, int cache_only, 1909 u64 min_trans); 1910 int btrfs_cow_block(struct btrfs_trans_handle *trans, 1911 struct btrfs_root *root, struct extent_buffer *buf, 1912 struct extent_buffer *parent, int parent_slot, 1913 struct extent_buffer **cow_ret); 1914 int btrfs_copy_root(struct btrfs_trans_handle *trans, 1915 struct btrfs_root *root, 1916 struct extent_buffer *buf, 1917 struct extent_buffer **cow_ret, u64 new_root_objectid); 1918 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root 1919 *root, struct btrfs_path *path, u32 data_size); 1920 int btrfs_truncate_item(struct btrfs_trans_handle *trans, 1921 struct btrfs_root *root, 1922 struct btrfs_path *path, 1923 u32 new_size, int from_end); 1924 int btrfs_split_item(struct btrfs_trans_handle *trans, 1925 struct btrfs_root *root, 1926 struct btrfs_path *path, 1927 struct btrfs_key *new_key, 1928 unsigned long split_offset); 1929 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 1930 *root, struct btrfs_key *key, struct btrfs_path *p, int 1931 ins_len, int cow); 1932 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 1933 struct btrfs_root *root, struct extent_buffer *parent, 1934 int start_slot, int cache_only, u64 *last_ret, 1935 struct btrfs_key *progress); 1936 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p); 1937 struct btrfs_path *btrfs_alloc_path(void); 1938 void btrfs_free_path(struct btrfs_path *p); 1939 void btrfs_set_path_blocking(struct btrfs_path *p); 1940 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 1941 1942 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1943 struct btrfs_path *path, int slot, int nr); 1944 int btrfs_del_leaf(struct btrfs_trans_handle *trans, 1945 struct btrfs_root *root, 1946 struct btrfs_path *path, u64 bytenr); 1947 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 1948 struct btrfs_root *root, 1949 struct btrfs_path *path) 1950 { 1951 return btrfs_del_items(trans, root, path, path->slots[0], 1); 1952 } 1953 1954 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 1955 *root, struct btrfs_key *key, void *data, u32 data_size); 1956 int btrfs_insert_some_items(struct btrfs_trans_handle *trans, 1957 struct btrfs_root *root, 1958 struct btrfs_path *path, 1959 struct btrfs_key *cpu_key, u32 *data_size, 1960 int nr); 1961 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 1962 struct btrfs_root *root, 1963 struct btrfs_path *path, 1964 struct btrfs_key *cpu_key, u32 *data_size, int nr); 1965 1966 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 1967 struct btrfs_root *root, 1968 struct btrfs_path *path, 1969 struct btrfs_key *key, 1970 u32 data_size) 1971 { 1972 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 1973 } 1974 1975 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 1976 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); 1977 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 1978 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root 1979 *root); 1980 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 1981 struct btrfs_root *root, 1982 struct extent_buffer *node, 1983 struct extent_buffer *parent); 1984 /* root-item.c */ 1985 int btrfs_find_root_ref(struct btrfs_root *tree_root, 1986 struct btrfs_path *path, 1987 u64 root_id, u64 ref_id); 1988 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 1989 struct btrfs_root *tree_root, 1990 u64 root_id, u8 type, u64 ref_id, 1991 u64 dirid, u64 sequence, 1992 const char *name, int name_len); 1993 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 1994 struct btrfs_key *key); 1995 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 1996 *root, struct btrfs_key *key, struct btrfs_root_item 1997 *item); 1998 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root 1999 *root, struct btrfs_key *key, struct btrfs_root_item 2000 *item); 2001 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct 2002 btrfs_root_item *item, struct btrfs_key *key); 2003 int btrfs_search_root(struct btrfs_root *root, u64 search_start, 2004 u64 *found_objectid); 2005 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid, 2006 struct btrfs_root *latest_root); 2007 /* dir-item.c */ 2008 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 2009 struct btrfs_root *root, const char *name, 2010 int name_len, u64 dir, 2011 struct btrfs_key *location, u8 type, u64 index); 2012 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 2013 struct btrfs_root *root, 2014 struct btrfs_path *path, u64 dir, 2015 const char *name, int name_len, 2016 int mod); 2017 struct btrfs_dir_item * 2018 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 2019 struct btrfs_root *root, 2020 struct btrfs_path *path, u64 dir, 2021 u64 objectid, const char *name, int name_len, 2022 int mod); 2023 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root, 2024 struct btrfs_path *path, 2025 const char *name, int name_len); 2026 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 2027 struct btrfs_root *root, 2028 struct btrfs_path *path, 2029 struct btrfs_dir_item *di); 2030 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 2031 struct btrfs_root *root, const char *name, 2032 u16 name_len, const void *data, u16 data_len, 2033 u64 dir); 2034 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 2035 struct btrfs_root *root, 2036 struct btrfs_path *path, u64 dir, 2037 const char *name, u16 name_len, 2038 int mod); 2039 2040 /* orphan.c */ 2041 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 2042 struct btrfs_root *root, u64 offset); 2043 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 2044 struct btrfs_root *root, u64 offset); 2045 2046 /* inode-map.c */ 2047 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans, 2048 struct btrfs_root *fs_root, 2049 u64 dirid, u64 *objectid); 2050 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid); 2051 2052 /* inode-item.c */ 2053 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 2054 struct btrfs_root *root, 2055 const char *name, int name_len, 2056 u64 inode_objectid, u64 ref_objectid, u64 index); 2057 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 2058 struct btrfs_root *root, 2059 const char *name, int name_len, 2060 u64 inode_objectid, u64 ref_objectid, u64 *index); 2061 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 2062 struct btrfs_root *root, 2063 struct btrfs_path *path, u64 objectid); 2064 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 2065 *root, struct btrfs_path *path, 2066 struct btrfs_key *location, int mod); 2067 2068 /* file-item.c */ 2069 int btrfs_del_csums(struct btrfs_trans_handle *trans, 2070 struct btrfs_root *root, u64 bytenr, u64 len); 2071 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 2072 struct bio *bio, u32 *dst); 2073 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 2074 struct btrfs_root *root, 2075 u64 objectid, u64 pos, 2076 u64 disk_offset, u64 disk_num_bytes, 2077 u64 num_bytes, u64 offset, u64 ram_bytes, 2078 u8 compression, u8 encryption, u16 other_encoding); 2079 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 2080 struct btrfs_root *root, 2081 struct btrfs_path *path, u64 objectid, 2082 u64 bytenr, int mod); 2083 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 2084 struct btrfs_root *root, 2085 struct btrfs_ordered_sum *sums); 2086 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 2087 struct bio *bio, u64 file_start, int contig); 2088 int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode, 2089 u64 start, unsigned long len); 2090 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, 2091 struct btrfs_root *root, 2092 struct btrfs_path *path, 2093 u64 bytenr, int cow); 2094 int btrfs_csum_truncate(struct btrfs_trans_handle *trans, 2095 struct btrfs_root *root, struct btrfs_path *path, 2096 u64 isize); 2097 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, 2098 u64 end, struct list_head *list); 2099 /* inode.c */ 2100 2101 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 2102 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 2103 #define ClearPageChecked ClearPageFsMisc 2104 #define SetPageChecked SetPageFsMisc 2105 #define PageChecked PageFsMisc 2106 #endif 2107 2108 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 2109 int btrfs_set_inode_index(struct inode *dir, u64 *index); 2110 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 2111 struct btrfs_root *root, 2112 struct inode *dir, struct inode *inode, 2113 const char *name, int name_len); 2114 int btrfs_add_link(struct btrfs_trans_handle *trans, 2115 struct inode *parent_inode, struct inode *inode, 2116 const char *name, int name_len, int add_backref, u64 index); 2117 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 2118 struct btrfs_root *root, 2119 struct inode *inode, u64 new_size, 2120 u32 min_type); 2121 2122 int btrfs_start_delalloc_inodes(struct btrfs_root *root); 2123 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end); 2124 int btrfs_writepages(struct address_space *mapping, 2125 struct writeback_control *wbc); 2126 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 2127 struct btrfs_root *new_root, struct dentry *dentry, 2128 u64 new_dirid, u64 alloc_hint); 2129 int btrfs_merge_bio_hook(struct page *page, unsigned long offset, 2130 size_t size, struct bio *bio, unsigned long bio_flags); 2131 2132 unsigned long btrfs_force_ra(struct address_space *mapping, 2133 struct file_ra_state *ra, struct file *file, 2134 pgoff_t offset, pgoff_t last_index); 2135 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 2136 int btrfs_readpage(struct file *file, struct page *page); 2137 void btrfs_delete_inode(struct inode *inode); 2138 void btrfs_put_inode(struct inode *inode); 2139 void btrfs_read_locked_inode(struct inode *inode); 2140 int btrfs_write_inode(struct inode *inode, int wait); 2141 void btrfs_dirty_inode(struct inode *inode); 2142 struct inode *btrfs_alloc_inode(struct super_block *sb); 2143 void btrfs_destroy_inode(struct inode *inode); 2144 int btrfs_init_cachep(void); 2145 void btrfs_destroy_cachep(void); 2146 long btrfs_ioctl_trans_end(struct file *file); 2147 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, 2148 struct btrfs_root *root, int wait); 2149 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, 2150 struct btrfs_root *root); 2151 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 2152 struct btrfs_root *root, int *is_new); 2153 int btrfs_commit_write(struct file *file, struct page *page, 2154 unsigned from, unsigned to); 2155 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 2156 size_t page_offset, u64 start, u64 end, 2157 int create); 2158 int btrfs_update_inode(struct btrfs_trans_handle *trans, 2159 struct btrfs_root *root, 2160 struct inode *inode); 2161 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 2162 int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode); 2163 void btrfs_orphan_cleanup(struct btrfs_root *root); 2164 int btrfs_cont_expand(struct inode *inode, loff_t size); 2165 2166 /* ioctl.c */ 2167 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 2168 2169 /* file.c */ 2170 int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync); 2171 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 2172 int skip_pinned); 2173 int btrfs_check_file(struct btrfs_root *root, struct inode *inode); 2174 extern struct file_operations btrfs_file_operations; 2175 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 2176 struct btrfs_root *root, struct inode *inode, 2177 u64 start, u64 end, u64 inline_limit, u64 *hint_block); 2178 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 2179 struct btrfs_root *root, 2180 struct inode *inode, u64 start, u64 end); 2181 int btrfs_release_file(struct inode *inode, struct file *file); 2182 2183 /* tree-defrag.c */ 2184 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 2185 struct btrfs_root *root, int cache_only); 2186 2187 /* sysfs.c */ 2188 int btrfs_init_sysfs(void); 2189 void btrfs_exit_sysfs(void); 2190 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs); 2191 int btrfs_sysfs_add_root(struct btrfs_root *root); 2192 void btrfs_sysfs_del_root(struct btrfs_root *root); 2193 void btrfs_sysfs_del_super(struct btrfs_fs_info *root); 2194 2195 /* xattr.c */ 2196 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 2197 2198 /* super.c */ 2199 u64 btrfs_parse_size(char *str); 2200 int btrfs_parse_options(struct btrfs_root *root, char *options); 2201 int btrfs_sync_fs(struct super_block *sb, int wait); 2202 2203 /* acl.c */ 2204 int btrfs_check_acl(struct inode *inode, int mask); 2205 int btrfs_init_acl(struct inode *inode, struct inode *dir); 2206 int btrfs_acl_chmod(struct inode *inode); 2207 2208 #endif 2209