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