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