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