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/mm.h> 23 #include <linux/highmem.h> 24 #include <linux/fs.h> 25 #include <linux/rwsem.h> 26 #include <linux/semaphore.h> 27 #include <linux/completion.h> 28 #include <linux/backing-dev.h> 29 #include <linux/wait.h> 30 #include <linux/slab.h> 31 #include <linux/kobject.h> 32 #include <trace/events/btrfs.h> 33 #include <asm/kmap_types.h> 34 #include <linux/pagemap.h> 35 #include <linux/btrfs.h> 36 #include "extent_io.h" 37 #include "extent_map.h" 38 #include "async-thread.h" 39 40 struct btrfs_trans_handle; 41 struct btrfs_transaction; 42 struct btrfs_pending_snapshot; 43 extern struct kmem_cache *btrfs_trans_handle_cachep; 44 extern struct kmem_cache *btrfs_transaction_cachep; 45 extern struct kmem_cache *btrfs_bit_radix_cachep; 46 extern struct kmem_cache *btrfs_path_cachep; 47 extern struct kmem_cache *btrfs_free_space_cachep; 48 struct btrfs_ordered_sum; 49 50 #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */ 51 52 #define BTRFS_MAX_MIRRORS 3 53 54 #define BTRFS_MAX_LEVEL 8 55 56 #define BTRFS_COMPAT_EXTENT_TREE_V0 57 58 /* 59 * files bigger than this get some pre-flushing when they are added 60 * to the ordered operations list. That way we limit the total 61 * work done by the commit 62 */ 63 #define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024) 64 65 /* holds pointers to all of the tree roots */ 66 #define BTRFS_ROOT_TREE_OBJECTID 1ULL 67 68 /* stores information about which extents are in use, and reference counts */ 69 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL 70 71 /* 72 * chunk tree stores translations from logical -> physical block numbering 73 * the super block points to the chunk tree 74 */ 75 #define BTRFS_CHUNK_TREE_OBJECTID 3ULL 76 77 /* 78 * stores information about which areas of a given device are in use. 79 * one per device. The tree of tree roots points to the device tree 80 */ 81 #define BTRFS_DEV_TREE_OBJECTID 4ULL 82 83 /* one per subvolume, storing files and directories */ 84 #define BTRFS_FS_TREE_OBJECTID 5ULL 85 86 /* directory objectid inside the root tree */ 87 #define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL 88 89 /* holds checksums of all the data extents */ 90 #define BTRFS_CSUM_TREE_OBJECTID 7ULL 91 92 /* holds quota configuration and tracking */ 93 #define BTRFS_QUOTA_TREE_OBJECTID 8ULL 94 95 /* for storing items that use the BTRFS_UUID_KEY* types */ 96 #define BTRFS_UUID_TREE_OBJECTID 9ULL 97 98 /* for storing balance parameters in the root tree */ 99 #define BTRFS_BALANCE_OBJECTID -4ULL 100 101 /* orhpan objectid for tracking unlinked/truncated files */ 102 #define BTRFS_ORPHAN_OBJECTID -5ULL 103 104 /* does write ahead logging to speed up fsyncs */ 105 #define BTRFS_TREE_LOG_OBJECTID -6ULL 106 #define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL 107 108 /* for space balancing */ 109 #define BTRFS_TREE_RELOC_OBJECTID -8ULL 110 #define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL 111 112 /* 113 * extent checksums all have this objectid 114 * this allows them to share the logging tree 115 * for fsyncs 116 */ 117 #define BTRFS_EXTENT_CSUM_OBJECTID -10ULL 118 119 /* For storing free space cache */ 120 #define BTRFS_FREE_SPACE_OBJECTID -11ULL 121 122 /* 123 * The inode number assigned to the special inode for storing 124 * free ino cache 125 */ 126 #define BTRFS_FREE_INO_OBJECTID -12ULL 127 128 /* dummy objectid represents multiple objectids */ 129 #define BTRFS_MULTIPLE_OBJECTIDS -255ULL 130 131 /* 132 * All files have objectids in this range. 133 */ 134 #define BTRFS_FIRST_FREE_OBJECTID 256ULL 135 #define BTRFS_LAST_FREE_OBJECTID -256ULL 136 #define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL 137 138 139 /* 140 * the device items go into the chunk tree. The key is in the form 141 * [ 1 BTRFS_DEV_ITEM_KEY device_id ] 142 */ 143 #define BTRFS_DEV_ITEMS_OBJECTID 1ULL 144 145 #define BTRFS_BTREE_INODE_OBJECTID 1 146 147 #define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2 148 149 #define BTRFS_DEV_REPLACE_DEVID 0ULL 150 151 /* 152 * the max metadata block size. This limit is somewhat artificial, 153 * but the memmove costs go through the roof for larger blocks. 154 */ 155 #define BTRFS_MAX_METADATA_BLOCKSIZE 65536 156 157 /* 158 * we can actually store much bigger names, but lets not confuse the rest 159 * of linux 160 */ 161 #define BTRFS_NAME_LEN 255 162 163 /* 164 * Theoretical limit is larger, but we keep this down to a sane 165 * value. That should limit greatly the possibility of collisions on 166 * inode ref items. 167 */ 168 #define BTRFS_LINK_MAX 65535U 169 170 /* 32 bytes in various csum fields */ 171 #define BTRFS_CSUM_SIZE 32 172 173 /* csum types */ 174 #define BTRFS_CSUM_TYPE_CRC32 0 175 176 static int btrfs_csum_sizes[] = { 4, 0 }; 177 178 /* four bytes for CRC32 */ 179 #define BTRFS_EMPTY_DIR_SIZE 0 180 181 /* spefic to btrfs_map_block(), therefore not in include/linux/blk_types.h */ 182 #define REQ_GET_READ_MIRRORS (1 << 30) 183 184 #define BTRFS_FT_UNKNOWN 0 185 #define BTRFS_FT_REG_FILE 1 186 #define BTRFS_FT_DIR 2 187 #define BTRFS_FT_CHRDEV 3 188 #define BTRFS_FT_BLKDEV 4 189 #define BTRFS_FT_FIFO 5 190 #define BTRFS_FT_SOCK 6 191 #define BTRFS_FT_SYMLINK 7 192 #define BTRFS_FT_XATTR 8 193 #define BTRFS_FT_MAX 9 194 195 /* ioprio of readahead is set to idle */ 196 #define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0)) 197 198 #define BTRFS_DIRTY_METADATA_THRESH (32 * 1024 * 1024) 199 200 /* 201 * The key defines the order in the tree, and so it also defines (optimal) 202 * block layout. 203 * 204 * objectid corresponds to the inode number. 205 * 206 * type tells us things about the object, and is a kind of stream selector. 207 * so for a given inode, keys with type of 1 might refer to the inode data, 208 * type of 2 may point to file data in the btree and type == 3 may point to 209 * extents. 210 * 211 * offset is the starting byte offset for this key in the stream. 212 * 213 * btrfs_disk_key is in disk byte order. struct btrfs_key is always 214 * in cpu native order. Otherwise they are identical and their sizes 215 * should be the same (ie both packed) 216 */ 217 struct btrfs_disk_key { 218 __le64 objectid; 219 u8 type; 220 __le64 offset; 221 } __attribute__ ((__packed__)); 222 223 struct btrfs_key { 224 u64 objectid; 225 u8 type; 226 u64 offset; 227 } __attribute__ ((__packed__)); 228 229 struct btrfs_mapping_tree { 230 struct extent_map_tree map_tree; 231 }; 232 233 struct btrfs_dev_item { 234 /* the internal btrfs device id */ 235 __le64 devid; 236 237 /* size of the device */ 238 __le64 total_bytes; 239 240 /* bytes used */ 241 __le64 bytes_used; 242 243 /* optimal io alignment for this device */ 244 __le32 io_align; 245 246 /* optimal io width for this device */ 247 __le32 io_width; 248 249 /* minimal io size for this device */ 250 __le32 sector_size; 251 252 /* type and info about this device */ 253 __le64 type; 254 255 /* expected generation for this device */ 256 __le64 generation; 257 258 /* 259 * starting byte of this partition on the device, 260 * to allow for stripe alignment in the future 261 */ 262 __le64 start_offset; 263 264 /* grouping information for allocation decisions */ 265 __le32 dev_group; 266 267 /* seek speed 0-100 where 100 is fastest */ 268 u8 seek_speed; 269 270 /* bandwidth 0-100 where 100 is fastest */ 271 u8 bandwidth; 272 273 /* btrfs generated uuid for this device */ 274 u8 uuid[BTRFS_UUID_SIZE]; 275 276 /* uuid of FS who owns this device */ 277 u8 fsid[BTRFS_UUID_SIZE]; 278 } __attribute__ ((__packed__)); 279 280 struct btrfs_stripe { 281 __le64 devid; 282 __le64 offset; 283 u8 dev_uuid[BTRFS_UUID_SIZE]; 284 } __attribute__ ((__packed__)); 285 286 struct btrfs_chunk { 287 /* size of this chunk in bytes */ 288 __le64 length; 289 290 /* objectid of the root referencing this chunk */ 291 __le64 owner; 292 293 __le64 stripe_len; 294 __le64 type; 295 296 /* optimal io alignment for this chunk */ 297 __le32 io_align; 298 299 /* optimal io width for this chunk */ 300 __le32 io_width; 301 302 /* minimal io size for this chunk */ 303 __le32 sector_size; 304 305 /* 2^16 stripes is quite a lot, a second limit is the size of a single 306 * item in the btree 307 */ 308 __le16 num_stripes; 309 310 /* sub stripes only matter for raid10 */ 311 __le16 sub_stripes; 312 struct btrfs_stripe stripe; 313 /* additional stripes go here */ 314 } __attribute__ ((__packed__)); 315 316 #define BTRFS_FREE_SPACE_EXTENT 1 317 #define BTRFS_FREE_SPACE_BITMAP 2 318 319 struct btrfs_free_space_entry { 320 __le64 offset; 321 __le64 bytes; 322 u8 type; 323 } __attribute__ ((__packed__)); 324 325 struct btrfs_free_space_header { 326 struct btrfs_disk_key location; 327 __le64 generation; 328 __le64 num_entries; 329 __le64 num_bitmaps; 330 } __attribute__ ((__packed__)); 331 332 static inline unsigned long btrfs_chunk_item_size(int num_stripes) 333 { 334 BUG_ON(num_stripes == 0); 335 return sizeof(struct btrfs_chunk) + 336 sizeof(struct btrfs_stripe) * (num_stripes - 1); 337 } 338 339 #define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0) 340 #define BTRFS_HEADER_FLAG_RELOC (1ULL << 1) 341 342 /* 343 * File system states 344 */ 345 #define BTRFS_FS_STATE_ERROR 0 346 #define BTRFS_FS_STATE_REMOUNTING 1 347 #define BTRFS_FS_STATE_TRANS_ABORTED 2 348 349 /* Super block flags */ 350 /* Errors detected */ 351 #define BTRFS_SUPER_FLAG_ERROR (1ULL << 2) 352 353 #define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32) 354 #define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33) 355 356 #define BTRFS_BACKREF_REV_MAX 256 357 #define BTRFS_BACKREF_REV_SHIFT 56 358 #define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \ 359 BTRFS_BACKREF_REV_SHIFT) 360 361 #define BTRFS_OLD_BACKREF_REV 0 362 #define BTRFS_MIXED_BACKREF_REV 1 363 364 /* 365 * every tree block (leaf or node) starts with this header. 366 */ 367 struct btrfs_header { 368 /* these first four must match the super block */ 369 u8 csum[BTRFS_CSUM_SIZE]; 370 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 371 __le64 bytenr; /* which block this node is supposed to live in */ 372 __le64 flags; 373 374 /* allowed to be different from the super from here on down */ 375 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 376 __le64 generation; 377 __le64 owner; 378 __le32 nritems; 379 u8 level; 380 } __attribute__ ((__packed__)); 381 382 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \ 383 sizeof(struct btrfs_header)) / \ 384 sizeof(struct btrfs_key_ptr)) 385 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header)) 386 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize)) 387 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 388 sizeof(struct btrfs_item) - \ 389 sizeof(struct btrfs_file_extent_item)) 390 #define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \ 391 sizeof(struct btrfs_item) -\ 392 sizeof(struct btrfs_dir_item)) 393 394 395 /* 396 * this is a very generous portion of the super block, giving us 397 * room to translate 14 chunks with 3 stripes each. 398 */ 399 #define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048 400 #define BTRFS_LABEL_SIZE 256 401 402 /* 403 * just in case we somehow lose the roots and are not able to mount, 404 * we store an array of the roots from previous transactions 405 * in the super. 406 */ 407 #define BTRFS_NUM_BACKUP_ROOTS 4 408 struct btrfs_root_backup { 409 __le64 tree_root; 410 __le64 tree_root_gen; 411 412 __le64 chunk_root; 413 __le64 chunk_root_gen; 414 415 __le64 extent_root; 416 __le64 extent_root_gen; 417 418 __le64 fs_root; 419 __le64 fs_root_gen; 420 421 __le64 dev_root; 422 __le64 dev_root_gen; 423 424 __le64 csum_root; 425 __le64 csum_root_gen; 426 427 __le64 total_bytes; 428 __le64 bytes_used; 429 __le64 num_devices; 430 /* future */ 431 __le64 unused_64[4]; 432 433 u8 tree_root_level; 434 u8 chunk_root_level; 435 u8 extent_root_level; 436 u8 fs_root_level; 437 u8 dev_root_level; 438 u8 csum_root_level; 439 /* future and to align */ 440 u8 unused_8[10]; 441 } __attribute__ ((__packed__)); 442 443 /* 444 * the super block basically lists the main trees of the FS 445 * it currently lacks any block count etc etc 446 */ 447 struct btrfs_super_block { 448 u8 csum[BTRFS_CSUM_SIZE]; 449 /* the first 4 fields must match struct btrfs_header */ 450 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */ 451 __le64 bytenr; /* this block number */ 452 __le64 flags; 453 454 /* allowed to be different from the btrfs_header from here own down */ 455 __le64 magic; 456 __le64 generation; 457 __le64 root; 458 __le64 chunk_root; 459 __le64 log_root; 460 461 /* this will help find the new super based on the log root */ 462 __le64 log_root_transid; 463 __le64 total_bytes; 464 __le64 bytes_used; 465 __le64 root_dir_objectid; 466 __le64 num_devices; 467 __le32 sectorsize; 468 __le32 nodesize; 469 __le32 leafsize; 470 __le32 stripesize; 471 __le32 sys_chunk_array_size; 472 __le64 chunk_root_generation; 473 __le64 compat_flags; 474 __le64 compat_ro_flags; 475 __le64 incompat_flags; 476 __le16 csum_type; 477 u8 root_level; 478 u8 chunk_root_level; 479 u8 log_root_level; 480 struct btrfs_dev_item dev_item; 481 482 char label[BTRFS_LABEL_SIZE]; 483 484 __le64 cache_generation; 485 __le64 uuid_tree_generation; 486 487 /* future expansion */ 488 __le64 reserved[30]; 489 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE]; 490 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS]; 491 } __attribute__ ((__packed__)); 492 493 /* 494 * Compat flags that we support. If any incompat flags are set other than the 495 * ones specified below then we will fail to mount 496 */ 497 #define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0) 498 #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1) 499 #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2) 500 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3) 501 /* 502 * some patches floated around with a second compression method 503 * lets save that incompat here for when they do get in 504 * Note we don't actually support it, we're just reserving the 505 * number 506 */ 507 #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2 (1ULL << 4) 508 509 /* 510 * older kernels tried to do bigger metadata blocks, but the 511 * code was pretty buggy. Lets not let them try anymore. 512 */ 513 #define BTRFS_FEATURE_INCOMPAT_BIG_METADATA (1ULL << 5) 514 515 #define BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF (1ULL << 6) 516 #define BTRFS_FEATURE_INCOMPAT_RAID56 (1ULL << 7) 517 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8) 518 519 #define BTRFS_FEATURE_COMPAT_SUPP 0ULL 520 #define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL 521 #define BTRFS_FEATURE_INCOMPAT_SUPP \ 522 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \ 523 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \ 524 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \ 525 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \ 526 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \ 527 BTRFS_FEATURE_INCOMPAT_RAID56 | \ 528 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \ 529 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) 530 531 /* 532 * A leaf is full of items. offset and size tell us where to find 533 * the item in the leaf (relative to the start of the data area) 534 */ 535 struct btrfs_item { 536 struct btrfs_disk_key key; 537 __le32 offset; 538 __le32 size; 539 } __attribute__ ((__packed__)); 540 541 /* 542 * leaves have an item area and a data area: 543 * [item0, item1....itemN] [free space] [dataN...data1, data0] 544 * 545 * The data is separate from the items to get the keys closer together 546 * during searches. 547 */ 548 struct btrfs_leaf { 549 struct btrfs_header header; 550 struct btrfs_item items[]; 551 } __attribute__ ((__packed__)); 552 553 /* 554 * all non-leaf blocks are nodes, they hold only keys and pointers to 555 * other blocks 556 */ 557 struct btrfs_key_ptr { 558 struct btrfs_disk_key key; 559 __le64 blockptr; 560 __le64 generation; 561 } __attribute__ ((__packed__)); 562 563 struct btrfs_node { 564 struct btrfs_header header; 565 struct btrfs_key_ptr ptrs[]; 566 } __attribute__ ((__packed__)); 567 568 /* 569 * btrfs_paths remember the path taken from the root down to the leaf. 570 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point 571 * to any other levels that are present. 572 * 573 * The slots array records the index of the item or block pointer 574 * used while walking the tree. 575 */ 576 struct btrfs_path { 577 struct extent_buffer *nodes[BTRFS_MAX_LEVEL]; 578 int slots[BTRFS_MAX_LEVEL]; 579 /* if there is real range locking, this locks field will change */ 580 int locks[BTRFS_MAX_LEVEL]; 581 int reada; 582 /* keep some upper locks as we walk down */ 583 int lowest_level; 584 585 /* 586 * set by btrfs_split_item, tells search_slot to keep all locks 587 * and to force calls to keep space in the nodes 588 */ 589 unsigned int search_for_split:1; 590 unsigned int keep_locks:1; 591 unsigned int skip_locking:1; 592 unsigned int leave_spinning:1; 593 unsigned int search_commit_root:1; 594 }; 595 596 /* 597 * items in the extent btree are used to record the objectid of the 598 * owner of the block and the number of references 599 */ 600 601 struct btrfs_extent_item { 602 __le64 refs; 603 __le64 generation; 604 __le64 flags; 605 } __attribute__ ((__packed__)); 606 607 struct btrfs_extent_item_v0 { 608 __le32 refs; 609 } __attribute__ ((__packed__)); 610 611 #define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \ 612 sizeof(struct btrfs_item)) 613 614 #define BTRFS_EXTENT_FLAG_DATA (1ULL << 0) 615 #define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1) 616 617 /* following flags only apply to tree blocks */ 618 619 /* use full backrefs for extent pointers in the block */ 620 #define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8) 621 622 /* 623 * this flag is only used internally by scrub and may be changed at any time 624 * it is only declared here to avoid collisions 625 */ 626 #define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48) 627 628 struct btrfs_tree_block_info { 629 struct btrfs_disk_key key; 630 u8 level; 631 } __attribute__ ((__packed__)); 632 633 struct btrfs_extent_data_ref { 634 __le64 root; 635 __le64 objectid; 636 __le64 offset; 637 __le32 count; 638 } __attribute__ ((__packed__)); 639 640 struct btrfs_shared_data_ref { 641 __le32 count; 642 } __attribute__ ((__packed__)); 643 644 struct btrfs_extent_inline_ref { 645 u8 type; 646 __le64 offset; 647 } __attribute__ ((__packed__)); 648 649 /* old style backrefs item */ 650 struct btrfs_extent_ref_v0 { 651 __le64 root; 652 __le64 generation; 653 __le64 objectid; 654 __le32 count; 655 } __attribute__ ((__packed__)); 656 657 658 /* dev extents record free space on individual devices. The owner 659 * field points back to the chunk allocation mapping tree that allocated 660 * the extent. The chunk tree uuid field is a way to double check the owner 661 */ 662 struct btrfs_dev_extent { 663 __le64 chunk_tree; 664 __le64 chunk_objectid; 665 __le64 chunk_offset; 666 __le64 length; 667 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 668 } __attribute__ ((__packed__)); 669 670 struct btrfs_inode_ref { 671 __le64 index; 672 __le16 name_len; 673 /* name goes here */ 674 } __attribute__ ((__packed__)); 675 676 struct btrfs_inode_extref { 677 __le64 parent_objectid; 678 __le64 index; 679 __le16 name_len; 680 __u8 name[0]; 681 /* name goes here */ 682 } __attribute__ ((__packed__)); 683 684 struct btrfs_timespec { 685 __le64 sec; 686 __le32 nsec; 687 } __attribute__ ((__packed__)); 688 689 enum btrfs_compression_type { 690 BTRFS_COMPRESS_NONE = 0, 691 BTRFS_COMPRESS_ZLIB = 1, 692 BTRFS_COMPRESS_LZO = 2, 693 BTRFS_COMPRESS_TYPES = 2, 694 BTRFS_COMPRESS_LAST = 3, 695 }; 696 697 struct btrfs_inode_item { 698 /* nfs style generation number */ 699 __le64 generation; 700 /* transid that last touched this inode */ 701 __le64 transid; 702 __le64 size; 703 __le64 nbytes; 704 __le64 block_group; 705 __le32 nlink; 706 __le32 uid; 707 __le32 gid; 708 __le32 mode; 709 __le64 rdev; 710 __le64 flags; 711 712 /* modification sequence number for NFS */ 713 __le64 sequence; 714 715 /* 716 * a little future expansion, for more than this we can 717 * just grow the inode item and version it 718 */ 719 __le64 reserved[4]; 720 struct btrfs_timespec atime; 721 struct btrfs_timespec ctime; 722 struct btrfs_timespec mtime; 723 struct btrfs_timespec otime; 724 } __attribute__ ((__packed__)); 725 726 struct btrfs_dir_log_item { 727 __le64 end; 728 } __attribute__ ((__packed__)); 729 730 struct btrfs_dir_item { 731 struct btrfs_disk_key location; 732 __le64 transid; 733 __le16 data_len; 734 __le16 name_len; 735 u8 type; 736 } __attribute__ ((__packed__)); 737 738 #define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0) 739 740 struct btrfs_root_item { 741 struct btrfs_inode_item inode; 742 __le64 generation; 743 __le64 root_dirid; 744 __le64 bytenr; 745 __le64 byte_limit; 746 __le64 bytes_used; 747 __le64 last_snapshot; 748 __le64 flags; 749 __le32 refs; 750 struct btrfs_disk_key drop_progress; 751 u8 drop_level; 752 u8 level; 753 754 /* 755 * The following fields appear after subvol_uuids+subvol_times 756 * were introduced. 757 */ 758 759 /* 760 * This generation number is used to test if the new fields are valid 761 * and up to date while reading the root item. Everytime the root item 762 * is written out, the "generation" field is copied into this field. If 763 * anyone ever mounted the fs with an older kernel, we will have 764 * mismatching generation values here and thus must invalidate the 765 * new fields. See btrfs_update_root and btrfs_find_last_root for 766 * details. 767 * the offset of generation_v2 is also used as the start for the memset 768 * when invalidating the fields. 769 */ 770 __le64 generation_v2; 771 u8 uuid[BTRFS_UUID_SIZE]; 772 u8 parent_uuid[BTRFS_UUID_SIZE]; 773 u8 received_uuid[BTRFS_UUID_SIZE]; 774 __le64 ctransid; /* updated when an inode changes */ 775 __le64 otransid; /* trans when created */ 776 __le64 stransid; /* trans when sent. non-zero for received subvol */ 777 __le64 rtransid; /* trans when received. non-zero for received subvol */ 778 struct btrfs_timespec ctime; 779 struct btrfs_timespec otime; 780 struct btrfs_timespec stime; 781 struct btrfs_timespec rtime; 782 __le64 reserved[8]; /* for future */ 783 } __attribute__ ((__packed__)); 784 785 /* 786 * this is used for both forward and backward root refs 787 */ 788 struct btrfs_root_ref { 789 __le64 dirid; 790 __le64 sequence; 791 __le16 name_len; 792 } __attribute__ ((__packed__)); 793 794 struct btrfs_disk_balance_args { 795 /* 796 * profiles to operate on, single is denoted by 797 * BTRFS_AVAIL_ALLOC_BIT_SINGLE 798 */ 799 __le64 profiles; 800 801 /* usage filter */ 802 __le64 usage; 803 804 /* devid filter */ 805 __le64 devid; 806 807 /* devid subset filter [pstart..pend) */ 808 __le64 pstart; 809 __le64 pend; 810 811 /* btrfs virtual address space subset filter [vstart..vend) */ 812 __le64 vstart; 813 __le64 vend; 814 815 /* 816 * profile to convert to, single is denoted by 817 * BTRFS_AVAIL_ALLOC_BIT_SINGLE 818 */ 819 __le64 target; 820 821 /* BTRFS_BALANCE_ARGS_* */ 822 __le64 flags; 823 824 __le64 unused[8]; 825 } __attribute__ ((__packed__)); 826 827 /* 828 * store balance parameters to disk so that balance can be properly 829 * resumed after crash or unmount 830 */ 831 struct btrfs_balance_item { 832 /* BTRFS_BALANCE_* */ 833 __le64 flags; 834 835 struct btrfs_disk_balance_args data; 836 struct btrfs_disk_balance_args meta; 837 struct btrfs_disk_balance_args sys; 838 839 __le64 unused[4]; 840 } __attribute__ ((__packed__)); 841 842 #define BTRFS_FILE_EXTENT_INLINE 0 843 #define BTRFS_FILE_EXTENT_REG 1 844 #define BTRFS_FILE_EXTENT_PREALLOC 2 845 846 struct btrfs_file_extent_item { 847 /* 848 * transaction id that created this extent 849 */ 850 __le64 generation; 851 /* 852 * max number of bytes to hold this extent in ram 853 * when we split a compressed extent we can't know how big 854 * each of the resulting pieces will be. So, this is 855 * an upper limit on the size of the extent in ram instead of 856 * an exact limit. 857 */ 858 __le64 ram_bytes; 859 860 /* 861 * 32 bits for the various ways we might encode the data, 862 * including compression and encryption. If any of these 863 * are set to something a given disk format doesn't understand 864 * it is treated like an incompat flag for reading and writing, 865 * but not for stat. 866 */ 867 u8 compression; 868 u8 encryption; 869 __le16 other_encoding; /* spare for later use */ 870 871 /* are we inline data or a real extent? */ 872 u8 type; 873 874 /* 875 * disk space consumed by the extent, checksum blocks are included 876 * in these numbers 877 */ 878 __le64 disk_bytenr; 879 __le64 disk_num_bytes; 880 /* 881 * the logical offset in file blocks (no csums) 882 * this extent record is for. This allows a file extent to point 883 * into the middle of an existing extent on disk, sharing it 884 * between two snapshots (useful if some bytes in the middle of the 885 * extent have changed 886 */ 887 __le64 offset; 888 /* 889 * the logical number of file blocks (no csums included). This 890 * always reflects the size uncompressed and without encoding. 891 */ 892 __le64 num_bytes; 893 894 } __attribute__ ((__packed__)); 895 896 struct btrfs_csum_item { 897 u8 csum; 898 } __attribute__ ((__packed__)); 899 900 struct btrfs_dev_stats_item { 901 /* 902 * grow this item struct at the end for future enhancements and keep 903 * the existing values unchanged 904 */ 905 __le64 values[BTRFS_DEV_STAT_VALUES_MAX]; 906 } __attribute__ ((__packed__)); 907 908 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS 0 909 #define BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_AVOID 1 910 #define BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED 0 911 #define BTRFS_DEV_REPLACE_ITEM_STATE_STARTED 1 912 #define BTRFS_DEV_REPLACE_ITEM_STATE_SUSPENDED 2 913 #define BTRFS_DEV_REPLACE_ITEM_STATE_FINISHED 3 914 #define BTRFS_DEV_REPLACE_ITEM_STATE_CANCELED 4 915 916 struct btrfs_dev_replace { 917 u64 replace_state; /* see #define above */ 918 u64 time_started; /* seconds since 1-Jan-1970 */ 919 u64 time_stopped; /* seconds since 1-Jan-1970 */ 920 atomic64_t num_write_errors; 921 atomic64_t num_uncorrectable_read_errors; 922 923 u64 cursor_left; 924 u64 committed_cursor_left; 925 u64 cursor_left_last_write_of_item; 926 u64 cursor_right; 927 928 u64 cont_reading_from_srcdev_mode; /* see #define above */ 929 930 int is_valid; 931 int item_needs_writeback; 932 struct btrfs_device *srcdev; 933 struct btrfs_device *tgtdev; 934 935 pid_t lock_owner; 936 atomic_t nesting_level; 937 struct mutex lock_finishing_cancel_unmount; 938 struct mutex lock_management_lock; 939 struct mutex lock; 940 941 struct btrfs_scrub_progress scrub_progress; 942 }; 943 944 struct btrfs_dev_replace_item { 945 /* 946 * grow this item struct at the end for future enhancements and keep 947 * the existing values unchanged 948 */ 949 __le64 src_devid; 950 __le64 cursor_left; 951 __le64 cursor_right; 952 __le64 cont_reading_from_srcdev_mode; 953 954 __le64 replace_state; 955 __le64 time_started; 956 __le64 time_stopped; 957 __le64 num_write_errors; 958 __le64 num_uncorrectable_read_errors; 959 } __attribute__ ((__packed__)); 960 961 /* different types of block groups (and chunks) */ 962 #define BTRFS_BLOCK_GROUP_DATA (1ULL << 0) 963 #define BTRFS_BLOCK_GROUP_SYSTEM (1ULL << 1) 964 #define BTRFS_BLOCK_GROUP_METADATA (1ULL << 2) 965 #define BTRFS_BLOCK_GROUP_RAID0 (1ULL << 3) 966 #define BTRFS_BLOCK_GROUP_RAID1 (1ULL << 4) 967 #define BTRFS_BLOCK_GROUP_DUP (1ULL << 5) 968 #define BTRFS_BLOCK_GROUP_RAID10 (1ULL << 6) 969 #define BTRFS_BLOCK_GROUP_RAID5 (1ULL << 7) 970 #define BTRFS_BLOCK_GROUP_RAID6 (1ULL << 8) 971 #define BTRFS_BLOCK_GROUP_RESERVED BTRFS_AVAIL_ALLOC_BIT_SINGLE 972 973 enum btrfs_raid_types { 974 BTRFS_RAID_RAID10, 975 BTRFS_RAID_RAID1, 976 BTRFS_RAID_DUP, 977 BTRFS_RAID_RAID0, 978 BTRFS_RAID_SINGLE, 979 BTRFS_RAID_RAID5, 980 BTRFS_RAID_RAID6, 981 BTRFS_NR_RAID_TYPES 982 }; 983 984 #define BTRFS_BLOCK_GROUP_TYPE_MASK (BTRFS_BLOCK_GROUP_DATA | \ 985 BTRFS_BLOCK_GROUP_SYSTEM | \ 986 BTRFS_BLOCK_GROUP_METADATA) 987 988 #define BTRFS_BLOCK_GROUP_PROFILE_MASK (BTRFS_BLOCK_GROUP_RAID0 | \ 989 BTRFS_BLOCK_GROUP_RAID1 | \ 990 BTRFS_BLOCK_GROUP_RAID5 | \ 991 BTRFS_BLOCK_GROUP_RAID6 | \ 992 BTRFS_BLOCK_GROUP_DUP | \ 993 BTRFS_BLOCK_GROUP_RAID10) 994 /* 995 * We need a bit for restriper to be able to tell when chunks of type 996 * SINGLE are available. This "extended" profile format is used in 997 * fs_info->avail_*_alloc_bits (in-memory) and balance item fields 998 * (on-disk). The corresponding on-disk bit in chunk.type is reserved 999 * to avoid remappings between two formats in future. 1000 */ 1001 #define BTRFS_AVAIL_ALLOC_BIT_SINGLE (1ULL << 48) 1002 1003 #define BTRFS_EXTENDED_PROFILE_MASK (BTRFS_BLOCK_GROUP_PROFILE_MASK | \ 1004 BTRFS_AVAIL_ALLOC_BIT_SINGLE) 1005 1006 static inline u64 chunk_to_extended(u64 flags) 1007 { 1008 if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0) 1009 flags |= BTRFS_AVAIL_ALLOC_BIT_SINGLE; 1010 1011 return flags; 1012 } 1013 static inline u64 extended_to_chunk(u64 flags) 1014 { 1015 return flags & ~BTRFS_AVAIL_ALLOC_BIT_SINGLE; 1016 } 1017 1018 struct btrfs_block_group_item { 1019 __le64 used; 1020 __le64 chunk_objectid; 1021 __le64 flags; 1022 } __attribute__ ((__packed__)); 1023 1024 /* 1025 * is subvolume quota turned on? 1026 */ 1027 #define BTRFS_QGROUP_STATUS_FLAG_ON (1ULL << 0) 1028 /* 1029 * RESCAN is set during the initialization phase 1030 */ 1031 #define BTRFS_QGROUP_STATUS_FLAG_RESCAN (1ULL << 1) 1032 /* 1033 * Some qgroup entries are known to be out of date, 1034 * either because the configuration has changed in a way that 1035 * makes a rescan necessary, or because the fs has been mounted 1036 * with a non-qgroup-aware version. 1037 * Turning qouta off and on again makes it inconsistent, too. 1038 */ 1039 #define BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT (1ULL << 2) 1040 1041 #define BTRFS_QGROUP_STATUS_VERSION 1 1042 1043 struct btrfs_qgroup_status_item { 1044 __le64 version; 1045 /* 1046 * the generation is updated during every commit. As older 1047 * versions of btrfs are not aware of qgroups, it will be 1048 * possible to detect inconsistencies by checking the 1049 * generation on mount time 1050 */ 1051 __le64 generation; 1052 1053 /* flag definitions see above */ 1054 __le64 flags; 1055 1056 /* 1057 * only used during scanning to record the progress 1058 * of the scan. It contains a logical address 1059 */ 1060 __le64 rescan; 1061 } __attribute__ ((__packed__)); 1062 1063 struct btrfs_qgroup_info_item { 1064 __le64 generation; 1065 __le64 rfer; 1066 __le64 rfer_cmpr; 1067 __le64 excl; 1068 __le64 excl_cmpr; 1069 } __attribute__ ((__packed__)); 1070 1071 /* flags definition for qgroup limits */ 1072 #define BTRFS_QGROUP_LIMIT_MAX_RFER (1ULL << 0) 1073 #define BTRFS_QGROUP_LIMIT_MAX_EXCL (1ULL << 1) 1074 #define BTRFS_QGROUP_LIMIT_RSV_RFER (1ULL << 2) 1075 #define BTRFS_QGROUP_LIMIT_RSV_EXCL (1ULL << 3) 1076 #define BTRFS_QGROUP_LIMIT_RFER_CMPR (1ULL << 4) 1077 #define BTRFS_QGROUP_LIMIT_EXCL_CMPR (1ULL << 5) 1078 1079 struct btrfs_qgroup_limit_item { 1080 /* 1081 * only updated when any of the other values change 1082 */ 1083 __le64 flags; 1084 __le64 max_rfer; 1085 __le64 max_excl; 1086 __le64 rsv_rfer; 1087 __le64 rsv_excl; 1088 } __attribute__ ((__packed__)); 1089 1090 struct btrfs_space_info { 1091 u64 flags; 1092 1093 u64 total_bytes; /* total bytes in the space, 1094 this doesn't take mirrors into account */ 1095 u64 bytes_used; /* total bytes used, 1096 this doesn't take mirrors into account */ 1097 u64 bytes_pinned; /* total bytes pinned, will be freed when the 1098 transaction finishes */ 1099 u64 bytes_reserved; /* total bytes the allocator has reserved for 1100 current allocations */ 1101 u64 bytes_readonly; /* total bytes that are read only */ 1102 1103 u64 bytes_may_use; /* number of bytes that may be used for 1104 delalloc/allocations */ 1105 u64 disk_used; /* total bytes used on disk */ 1106 u64 disk_total; /* total bytes on disk, takes mirrors into 1107 account */ 1108 1109 /* 1110 * bytes_pinned is kept in line with what is actually pinned, as in 1111 * we've called update_block_group and dropped the bytes_used counter 1112 * and increased the bytes_pinned counter. However this means that 1113 * bytes_pinned does not reflect the bytes that will be pinned once the 1114 * delayed refs are flushed, so this counter is inc'ed everytime we call 1115 * btrfs_free_extent so it is a realtime count of what will be freed 1116 * once the transaction is committed. It will be zero'ed everytime the 1117 * transaction commits. 1118 */ 1119 struct percpu_counter total_bytes_pinned; 1120 1121 unsigned int full:1; /* indicates that we cannot allocate any more 1122 chunks for this space */ 1123 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */ 1124 1125 unsigned int flush:1; /* set if we are trying to make space */ 1126 1127 unsigned int force_alloc; /* set if we need to force a chunk 1128 alloc for this space */ 1129 1130 struct list_head list; 1131 1132 /* for block groups in our same type */ 1133 struct list_head block_groups[BTRFS_NR_RAID_TYPES]; 1134 spinlock_t lock; 1135 struct rw_semaphore groups_sem; 1136 wait_queue_head_t wait; 1137 }; 1138 1139 #define BTRFS_BLOCK_RSV_GLOBAL 1 1140 #define BTRFS_BLOCK_RSV_DELALLOC 2 1141 #define BTRFS_BLOCK_RSV_TRANS 3 1142 #define BTRFS_BLOCK_RSV_CHUNK 4 1143 #define BTRFS_BLOCK_RSV_DELOPS 5 1144 #define BTRFS_BLOCK_RSV_EMPTY 6 1145 #define BTRFS_BLOCK_RSV_TEMP 7 1146 1147 struct btrfs_block_rsv { 1148 u64 size; 1149 u64 reserved; 1150 struct btrfs_space_info *space_info; 1151 spinlock_t lock; 1152 unsigned short full; 1153 unsigned short type; 1154 unsigned short failfast; 1155 }; 1156 1157 /* 1158 * free clusters are used to claim free space in relatively large chunks, 1159 * allowing us to do less seeky writes. They are used for all metadata 1160 * allocations and data allocations in ssd mode. 1161 */ 1162 struct btrfs_free_cluster { 1163 spinlock_t lock; 1164 spinlock_t refill_lock; 1165 struct rb_root root; 1166 1167 /* largest extent in this cluster */ 1168 u64 max_size; 1169 1170 /* first extent starting offset */ 1171 u64 window_start; 1172 1173 struct btrfs_block_group_cache *block_group; 1174 /* 1175 * when a cluster is allocated from a block group, we put the 1176 * cluster onto a list in the block group so that it can 1177 * be freed before the block group is freed. 1178 */ 1179 struct list_head block_group_list; 1180 }; 1181 1182 enum btrfs_caching_type { 1183 BTRFS_CACHE_NO = 0, 1184 BTRFS_CACHE_STARTED = 1, 1185 BTRFS_CACHE_FAST = 2, 1186 BTRFS_CACHE_FINISHED = 3, 1187 BTRFS_CACHE_ERROR = 4, 1188 }; 1189 1190 enum btrfs_disk_cache_state { 1191 BTRFS_DC_WRITTEN = 0, 1192 BTRFS_DC_ERROR = 1, 1193 BTRFS_DC_CLEAR = 2, 1194 BTRFS_DC_SETUP = 3, 1195 BTRFS_DC_NEED_WRITE = 4, 1196 }; 1197 1198 struct btrfs_caching_control { 1199 struct list_head list; 1200 struct mutex mutex; 1201 wait_queue_head_t wait; 1202 struct btrfs_work work; 1203 struct btrfs_block_group_cache *block_group; 1204 u64 progress; 1205 atomic_t count; 1206 }; 1207 1208 struct btrfs_block_group_cache { 1209 struct btrfs_key key; 1210 struct btrfs_block_group_item item; 1211 struct btrfs_fs_info *fs_info; 1212 struct inode *inode; 1213 spinlock_t lock; 1214 u64 pinned; 1215 u64 reserved; 1216 u64 bytes_super; 1217 u64 flags; 1218 u64 sectorsize; 1219 u64 cache_generation; 1220 1221 /* for raid56, this is a full stripe, without parity */ 1222 unsigned long full_stripe_len; 1223 1224 unsigned int ro:1; 1225 unsigned int dirty:1; 1226 unsigned int iref:1; 1227 1228 int disk_cache_state; 1229 1230 /* cache tracking stuff */ 1231 int cached; 1232 struct btrfs_caching_control *caching_ctl; 1233 u64 last_byte_to_unpin; 1234 1235 struct btrfs_space_info *space_info; 1236 1237 /* free space cache stuff */ 1238 struct btrfs_free_space_ctl *free_space_ctl; 1239 1240 /* block group cache stuff */ 1241 struct rb_node cache_node; 1242 1243 /* for block groups in the same raid type */ 1244 struct list_head list; 1245 1246 /* usage count */ 1247 atomic_t count; 1248 1249 /* List of struct btrfs_free_clusters for this block group. 1250 * Today it will only have one thing on it, but that may change 1251 */ 1252 struct list_head cluster_list; 1253 1254 /* For delayed block group creation */ 1255 struct list_head new_bg_list; 1256 }; 1257 1258 /* delayed seq elem */ 1259 struct seq_list { 1260 struct list_head list; 1261 u64 seq; 1262 }; 1263 1264 enum btrfs_orphan_cleanup_state { 1265 ORPHAN_CLEANUP_STARTED = 1, 1266 ORPHAN_CLEANUP_DONE = 2, 1267 }; 1268 1269 /* used by the raid56 code to lock stripes for read/modify/write */ 1270 struct btrfs_stripe_hash { 1271 struct list_head hash_list; 1272 wait_queue_head_t wait; 1273 spinlock_t lock; 1274 }; 1275 1276 /* used by the raid56 code to lock stripes for read/modify/write */ 1277 struct btrfs_stripe_hash_table { 1278 struct list_head stripe_cache; 1279 spinlock_t cache_lock; 1280 int cache_size; 1281 struct btrfs_stripe_hash table[]; 1282 }; 1283 1284 #define BTRFS_STRIPE_HASH_TABLE_BITS 11 1285 1286 /* fs_info */ 1287 struct reloc_control; 1288 struct btrfs_device; 1289 struct btrfs_fs_devices; 1290 struct btrfs_balance_control; 1291 struct btrfs_delayed_root; 1292 struct btrfs_fs_info { 1293 u8 fsid[BTRFS_FSID_SIZE]; 1294 u8 chunk_tree_uuid[BTRFS_UUID_SIZE]; 1295 struct btrfs_root *extent_root; 1296 struct btrfs_root *tree_root; 1297 struct btrfs_root *chunk_root; 1298 struct btrfs_root *dev_root; 1299 struct btrfs_root *fs_root; 1300 struct btrfs_root *csum_root; 1301 struct btrfs_root *quota_root; 1302 struct btrfs_root *uuid_root; 1303 1304 /* the log root tree is a directory of all the other log roots */ 1305 struct btrfs_root *log_root_tree; 1306 1307 spinlock_t fs_roots_radix_lock; 1308 struct radix_tree_root fs_roots_radix; 1309 1310 /* block group cache stuff */ 1311 spinlock_t block_group_cache_lock; 1312 u64 first_logical_byte; 1313 struct rb_root block_group_cache_tree; 1314 1315 /* keep track of unallocated space */ 1316 spinlock_t free_chunk_lock; 1317 u64 free_chunk_space; 1318 1319 struct extent_io_tree freed_extents[2]; 1320 struct extent_io_tree *pinned_extents; 1321 1322 /* logical->physical extent mapping */ 1323 struct btrfs_mapping_tree mapping_tree; 1324 1325 /* 1326 * block reservation for extent, checksum, root tree and 1327 * delayed dir index item 1328 */ 1329 struct btrfs_block_rsv global_block_rsv; 1330 /* block reservation for delay allocation */ 1331 struct btrfs_block_rsv delalloc_block_rsv; 1332 /* block reservation for metadata operations */ 1333 struct btrfs_block_rsv trans_block_rsv; 1334 /* block reservation for chunk tree */ 1335 struct btrfs_block_rsv chunk_block_rsv; 1336 /* block reservation for delayed operations */ 1337 struct btrfs_block_rsv delayed_block_rsv; 1338 1339 struct btrfs_block_rsv empty_block_rsv; 1340 1341 u64 generation; 1342 u64 last_trans_committed; 1343 1344 /* 1345 * this is updated to the current trans every time a full commit 1346 * is required instead of the faster short fsync log commits 1347 */ 1348 u64 last_trans_log_full_commit; 1349 unsigned long mount_opt; 1350 unsigned long compress_type:4; 1351 int commit_interval; 1352 /* 1353 * It is a suggestive number, the read side is safe even it gets a 1354 * wrong number because we will write out the data into a regular 1355 * extent. The write side(mount/remount) is under ->s_umount lock, 1356 * so it is also safe. 1357 */ 1358 u64 max_inline; 1359 /* 1360 * Protected by ->chunk_mutex and sb->s_umount. 1361 * 1362 * The reason that we use two lock to protect it is because only 1363 * remount and mount operations can change it and these two operations 1364 * are under sb->s_umount, but the read side (chunk allocation) can not 1365 * acquire sb->s_umount or the deadlock would happen. So we use two 1366 * locks to protect it. On the write side, we must acquire two locks, 1367 * and on the read side, we just need acquire one of them. 1368 */ 1369 u64 alloc_start; 1370 struct btrfs_transaction *running_transaction; 1371 wait_queue_head_t transaction_throttle; 1372 wait_queue_head_t transaction_wait; 1373 wait_queue_head_t transaction_blocked_wait; 1374 wait_queue_head_t async_submit_wait; 1375 1376 /* 1377 * Used to protect the incompat_flags, compat_flags, compat_ro_flags 1378 * when they are updated. 1379 * 1380 * Because we do not clear the flags for ever, so we needn't use 1381 * the lock on the read side. 1382 * 1383 * We also needn't use the lock when we mount the fs, because 1384 * there is no other task which will update the flag. 1385 */ 1386 spinlock_t super_lock; 1387 struct btrfs_super_block *super_copy; 1388 struct btrfs_super_block *super_for_commit; 1389 struct block_device *__bdev; 1390 struct super_block *sb; 1391 struct inode *btree_inode; 1392 struct backing_dev_info bdi; 1393 struct mutex tree_log_mutex; 1394 struct mutex transaction_kthread_mutex; 1395 struct mutex cleaner_mutex; 1396 struct mutex chunk_mutex; 1397 struct mutex volume_mutex; 1398 1399 /* this is used during read/modify/write to make sure 1400 * no two ios are trying to mod the same stripe at the same 1401 * time 1402 */ 1403 struct btrfs_stripe_hash_table *stripe_hash_table; 1404 1405 /* 1406 * this protects the ordered operations list only while we are 1407 * processing all of the entries on it. This way we make 1408 * sure the commit code doesn't find the list temporarily empty 1409 * because another function happens to be doing non-waiting preflush 1410 * before jumping into the main commit. 1411 */ 1412 struct mutex ordered_operations_mutex; 1413 1414 /* 1415 * Same as ordered_operations_mutex except this is for ordered extents 1416 * and not the operations. 1417 */ 1418 struct mutex ordered_extent_flush_mutex; 1419 1420 struct rw_semaphore extent_commit_sem; 1421 1422 struct rw_semaphore cleanup_work_sem; 1423 1424 struct rw_semaphore subvol_sem; 1425 struct srcu_struct subvol_srcu; 1426 1427 spinlock_t trans_lock; 1428 /* 1429 * the reloc mutex goes with the trans lock, it is taken 1430 * during commit to protect us from the relocation code 1431 */ 1432 struct mutex reloc_mutex; 1433 1434 struct list_head trans_list; 1435 struct list_head dead_roots; 1436 struct list_head caching_block_groups; 1437 1438 spinlock_t delayed_iput_lock; 1439 struct list_head delayed_iputs; 1440 1441 /* this protects tree_mod_seq_list */ 1442 spinlock_t tree_mod_seq_lock; 1443 atomic64_t tree_mod_seq; 1444 struct list_head tree_mod_seq_list; 1445 struct seq_list tree_mod_seq_elem; 1446 1447 /* this protects tree_mod_log */ 1448 rwlock_t tree_mod_log_lock; 1449 struct rb_root tree_mod_log; 1450 1451 atomic_t nr_async_submits; 1452 atomic_t async_submit_draining; 1453 atomic_t nr_async_bios; 1454 atomic_t async_delalloc_pages; 1455 atomic_t open_ioctl_trans; 1456 1457 /* 1458 * this is used to protect the following list -- ordered_roots. 1459 */ 1460 spinlock_t ordered_root_lock; 1461 1462 /* 1463 * all fs/file tree roots in which there are data=ordered extents 1464 * pending writeback are added into this list. 1465 * 1466 * these can span multiple transactions and basically include 1467 * every dirty data page that isn't from nodatacow 1468 */ 1469 struct list_head ordered_roots; 1470 1471 spinlock_t delalloc_root_lock; 1472 /* all fs/file tree roots that have delalloc inodes. */ 1473 struct list_head delalloc_roots; 1474 1475 /* 1476 * there is a pool of worker threads for checksumming during writes 1477 * and a pool for checksumming after reads. This is because readers 1478 * can run with FS locks held, and the writers may be waiting for 1479 * those locks. We don't want ordering in the pending list to cause 1480 * deadlocks, and so the two are serviced separately. 1481 * 1482 * A third pool does submit_bio to avoid deadlocking with the other 1483 * two 1484 */ 1485 struct btrfs_workers generic_worker; 1486 struct btrfs_workers workers; 1487 struct btrfs_workers delalloc_workers; 1488 struct btrfs_workers flush_workers; 1489 struct btrfs_workers endio_workers; 1490 struct btrfs_workers endio_meta_workers; 1491 struct btrfs_workers endio_raid56_workers; 1492 struct btrfs_workers rmw_workers; 1493 struct btrfs_workers endio_meta_write_workers; 1494 struct btrfs_workers endio_write_workers; 1495 struct btrfs_workers endio_freespace_worker; 1496 struct btrfs_workers submit_workers; 1497 struct btrfs_workers caching_workers; 1498 struct btrfs_workers readahead_workers; 1499 1500 /* 1501 * fixup workers take dirty pages that didn't properly go through 1502 * the cow mechanism and make them safe to write. It happens 1503 * for the sys_munmap function call path 1504 */ 1505 struct btrfs_workers fixup_workers; 1506 struct btrfs_workers delayed_workers; 1507 struct task_struct *transaction_kthread; 1508 struct task_struct *cleaner_kthread; 1509 int thread_pool_size; 1510 1511 struct kobject super_kobj; 1512 struct completion kobj_unregister; 1513 int do_barriers; 1514 int closing; 1515 int log_root_recovering; 1516 1517 u64 total_pinned; 1518 1519 /* used to keep from writing metadata until there is a nice batch */ 1520 struct percpu_counter dirty_metadata_bytes; 1521 struct percpu_counter delalloc_bytes; 1522 s32 dirty_metadata_batch; 1523 s32 delalloc_batch; 1524 1525 struct list_head dirty_cowonly_roots; 1526 1527 struct btrfs_fs_devices *fs_devices; 1528 1529 /* 1530 * the space_info list is almost entirely read only. It only changes 1531 * when we add a new raid type to the FS, and that happens 1532 * very rarely. RCU is used to protect it. 1533 */ 1534 struct list_head space_info; 1535 1536 struct btrfs_space_info *data_sinfo; 1537 1538 struct reloc_control *reloc_ctl; 1539 1540 /* data_alloc_cluster is only used in ssd mode */ 1541 struct btrfs_free_cluster data_alloc_cluster; 1542 1543 /* all metadata allocations go through this cluster */ 1544 struct btrfs_free_cluster meta_alloc_cluster; 1545 1546 /* auto defrag inodes go here */ 1547 spinlock_t defrag_inodes_lock; 1548 struct rb_root defrag_inodes; 1549 atomic_t defrag_running; 1550 1551 /* Used to protect avail_{data, metadata, system}_alloc_bits */ 1552 seqlock_t profiles_lock; 1553 /* 1554 * these three are in extended format (availability of single 1555 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other 1556 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits) 1557 */ 1558 u64 avail_data_alloc_bits; 1559 u64 avail_metadata_alloc_bits; 1560 u64 avail_system_alloc_bits; 1561 1562 /* restriper state */ 1563 spinlock_t balance_lock; 1564 struct mutex balance_mutex; 1565 atomic_t balance_running; 1566 atomic_t balance_pause_req; 1567 atomic_t balance_cancel_req; 1568 struct btrfs_balance_control *balance_ctl; 1569 wait_queue_head_t balance_wait_q; 1570 1571 unsigned data_chunk_allocations; 1572 unsigned metadata_ratio; 1573 1574 void *bdev_holder; 1575 1576 /* private scrub information */ 1577 struct mutex scrub_lock; 1578 atomic_t scrubs_running; 1579 atomic_t scrub_pause_req; 1580 atomic_t scrubs_paused; 1581 atomic_t scrub_cancel_req; 1582 wait_queue_head_t scrub_pause_wait; 1583 struct rw_semaphore scrub_super_lock; 1584 int scrub_workers_refcnt; 1585 struct btrfs_workers scrub_workers; 1586 struct btrfs_workers scrub_wr_completion_workers; 1587 struct btrfs_workers scrub_nocow_workers; 1588 1589 #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY 1590 u32 check_integrity_print_mask; 1591 #endif 1592 /* 1593 * quota information 1594 */ 1595 unsigned int quota_enabled:1; 1596 1597 /* 1598 * quota_enabled only changes state after a commit. This holds the 1599 * next state. 1600 */ 1601 unsigned int pending_quota_state:1; 1602 1603 /* is qgroup tracking in a consistent state? */ 1604 u64 qgroup_flags; 1605 1606 /* holds configuration and tracking. Protected by qgroup_lock */ 1607 struct rb_root qgroup_tree; 1608 spinlock_t qgroup_lock; 1609 1610 /* 1611 * used to avoid frequently calling ulist_alloc()/ulist_free() 1612 * when doing qgroup accounting, it must be protected by qgroup_lock. 1613 */ 1614 struct ulist *qgroup_ulist; 1615 1616 /* protect user change for quota operations */ 1617 struct mutex qgroup_ioctl_lock; 1618 1619 /* list of dirty qgroups to be written at next commit */ 1620 struct list_head dirty_qgroups; 1621 1622 /* used by btrfs_qgroup_record_ref for an efficient tree traversal */ 1623 u64 qgroup_seq; 1624 1625 /* qgroup rescan items */ 1626 struct mutex qgroup_rescan_lock; /* protects the progress item */ 1627 struct btrfs_key qgroup_rescan_progress; 1628 struct btrfs_workers qgroup_rescan_workers; 1629 struct completion qgroup_rescan_completion; 1630 struct btrfs_work qgroup_rescan_work; 1631 1632 /* filesystem state */ 1633 unsigned long fs_state; 1634 1635 struct btrfs_delayed_root *delayed_root; 1636 1637 /* readahead tree */ 1638 spinlock_t reada_lock; 1639 struct radix_tree_root reada_tree; 1640 1641 /* next backup root to be overwritten */ 1642 int backup_root_index; 1643 1644 int num_tolerated_disk_barrier_failures; 1645 1646 /* device replace state */ 1647 struct btrfs_dev_replace dev_replace; 1648 1649 atomic_t mutually_exclusive_operation_running; 1650 1651 struct semaphore uuid_tree_rescan_sem; 1652 unsigned int update_uuid_tree_gen:1; 1653 }; 1654 1655 /* 1656 * in ram representation of the tree. extent_root is used for all allocations 1657 * and for the extent tree extent_root root. 1658 */ 1659 struct btrfs_root { 1660 struct extent_buffer *node; 1661 1662 struct extent_buffer *commit_root; 1663 struct btrfs_root *log_root; 1664 struct btrfs_root *reloc_root; 1665 1666 struct btrfs_root_item root_item; 1667 struct btrfs_key root_key; 1668 struct btrfs_fs_info *fs_info; 1669 struct extent_io_tree dirty_log_pages; 1670 1671 struct kobject root_kobj; 1672 struct completion kobj_unregister; 1673 struct mutex objectid_mutex; 1674 1675 spinlock_t accounting_lock; 1676 struct btrfs_block_rsv *block_rsv; 1677 1678 /* free ino cache stuff */ 1679 struct mutex fs_commit_mutex; 1680 struct btrfs_free_space_ctl *free_ino_ctl; 1681 enum btrfs_caching_type cached; 1682 spinlock_t cache_lock; 1683 wait_queue_head_t cache_wait; 1684 struct btrfs_free_space_ctl *free_ino_pinned; 1685 u64 cache_progress; 1686 struct inode *cache_inode; 1687 1688 struct mutex log_mutex; 1689 wait_queue_head_t log_writer_wait; 1690 wait_queue_head_t log_commit_wait[2]; 1691 atomic_t log_writers; 1692 atomic_t log_commit[2]; 1693 atomic_t log_batch; 1694 unsigned long log_transid; 1695 unsigned long last_log_commit; 1696 pid_t log_start_pid; 1697 bool log_multiple_pids; 1698 1699 u64 objectid; 1700 u64 last_trans; 1701 1702 /* data allocations are done in sectorsize units */ 1703 u32 sectorsize; 1704 1705 /* node allocations are done in nodesize units */ 1706 u32 nodesize; 1707 1708 /* leaf allocations are done in leafsize units */ 1709 u32 leafsize; 1710 1711 u32 stripesize; 1712 1713 u32 type; 1714 1715 u64 highest_objectid; 1716 1717 /* btrfs_record_root_in_trans is a multi-step process, 1718 * and it can race with the balancing code. But the 1719 * race is very small, and only the first time the root 1720 * is added to each transaction. So in_trans_setup 1721 * is used to tell us when more checks are required 1722 */ 1723 unsigned long in_trans_setup; 1724 int ref_cows; 1725 int track_dirty; 1726 int in_radix; 1727 1728 u64 defrag_trans_start; 1729 struct btrfs_key defrag_progress; 1730 struct btrfs_key defrag_max; 1731 int defrag_running; 1732 char *name; 1733 1734 /* the dirty list is only used by non-reference counted roots */ 1735 struct list_head dirty_list; 1736 1737 struct list_head root_list; 1738 1739 spinlock_t log_extents_lock[2]; 1740 struct list_head logged_list[2]; 1741 1742 spinlock_t orphan_lock; 1743 atomic_t orphan_inodes; 1744 struct btrfs_block_rsv *orphan_block_rsv; 1745 int orphan_item_inserted; 1746 int orphan_cleanup_state; 1747 1748 spinlock_t inode_lock; 1749 /* red-black tree that keeps track of in-memory inodes */ 1750 struct rb_root inode_tree; 1751 1752 /* 1753 * radix tree that keeps track of delayed nodes of every inode, 1754 * protected by inode_lock 1755 */ 1756 struct radix_tree_root delayed_nodes_tree; 1757 /* 1758 * right now this just gets used so that a root has its own devid 1759 * for stat. It may be used for more later 1760 */ 1761 dev_t anon_dev; 1762 1763 int force_cow; 1764 1765 spinlock_t root_item_lock; 1766 atomic_t refs; 1767 1768 spinlock_t delalloc_lock; 1769 /* 1770 * all of the inodes that have delalloc bytes. It is possible for 1771 * this list to be empty even when there is still dirty data=ordered 1772 * extents waiting to finish IO. 1773 */ 1774 struct list_head delalloc_inodes; 1775 struct list_head delalloc_root; 1776 u64 nr_delalloc_inodes; 1777 /* 1778 * this is used by the balancing code to wait for all the pending 1779 * ordered extents 1780 */ 1781 spinlock_t ordered_extent_lock; 1782 1783 /* 1784 * all of the data=ordered extents pending writeback 1785 * these can span multiple transactions and basically include 1786 * every dirty data page that isn't from nodatacow 1787 */ 1788 struct list_head ordered_extents; 1789 struct list_head ordered_root; 1790 u64 nr_ordered_extents; 1791 }; 1792 1793 struct btrfs_ioctl_defrag_range_args { 1794 /* start of the defrag operation */ 1795 __u64 start; 1796 1797 /* number of bytes to defrag, use (u64)-1 to say all */ 1798 __u64 len; 1799 1800 /* 1801 * flags for the operation, which can include turning 1802 * on compression for this one defrag 1803 */ 1804 __u64 flags; 1805 1806 /* 1807 * any extent bigger than this will be considered 1808 * already defragged. Use 0 to take the kernel default 1809 * Use 1 to say every single extent must be rewritten 1810 */ 1811 __u32 extent_thresh; 1812 1813 /* 1814 * which compression method to use if turning on compression 1815 * for this defrag operation. If unspecified, zlib will 1816 * be used 1817 */ 1818 __u32 compress_type; 1819 1820 /* spare for later */ 1821 __u32 unused[4]; 1822 }; 1823 1824 1825 /* 1826 * inode items have the data typically returned from stat and store other 1827 * info about object characteristics. There is one for every file and dir in 1828 * the FS 1829 */ 1830 #define BTRFS_INODE_ITEM_KEY 1 1831 #define BTRFS_INODE_REF_KEY 12 1832 #define BTRFS_INODE_EXTREF_KEY 13 1833 #define BTRFS_XATTR_ITEM_KEY 24 1834 #define BTRFS_ORPHAN_ITEM_KEY 48 1835 /* reserve 2-15 close to the inode for later flexibility */ 1836 1837 /* 1838 * dir items are the name -> inode pointers in a directory. There is one 1839 * for every name in a directory. 1840 */ 1841 #define BTRFS_DIR_LOG_ITEM_KEY 60 1842 #define BTRFS_DIR_LOG_INDEX_KEY 72 1843 #define BTRFS_DIR_ITEM_KEY 84 1844 #define BTRFS_DIR_INDEX_KEY 96 1845 /* 1846 * extent data is for file data 1847 */ 1848 #define BTRFS_EXTENT_DATA_KEY 108 1849 1850 /* 1851 * extent csums are stored in a separate tree and hold csums for 1852 * an entire extent on disk. 1853 */ 1854 #define BTRFS_EXTENT_CSUM_KEY 128 1855 1856 /* 1857 * root items point to tree roots. They are typically in the root 1858 * tree used by the super block to find all the other trees 1859 */ 1860 #define BTRFS_ROOT_ITEM_KEY 132 1861 1862 /* 1863 * root backrefs tie subvols and snapshots to the directory entries that 1864 * reference them 1865 */ 1866 #define BTRFS_ROOT_BACKREF_KEY 144 1867 1868 /* 1869 * root refs make a fast index for listing all of the snapshots and 1870 * subvolumes referenced by a given root. They point directly to the 1871 * directory item in the root that references the subvol 1872 */ 1873 #define BTRFS_ROOT_REF_KEY 156 1874 1875 /* 1876 * extent items are in the extent map tree. These record which blocks 1877 * are used, and how many references there are to each block 1878 */ 1879 #define BTRFS_EXTENT_ITEM_KEY 168 1880 1881 /* 1882 * The same as the BTRFS_EXTENT_ITEM_KEY, except it's metadata we already know 1883 * the length, so we save the level in key->offset instead of the length. 1884 */ 1885 #define BTRFS_METADATA_ITEM_KEY 169 1886 1887 #define BTRFS_TREE_BLOCK_REF_KEY 176 1888 1889 #define BTRFS_EXTENT_DATA_REF_KEY 178 1890 1891 #define BTRFS_EXTENT_REF_V0_KEY 180 1892 1893 #define BTRFS_SHARED_BLOCK_REF_KEY 182 1894 1895 #define BTRFS_SHARED_DATA_REF_KEY 184 1896 1897 /* 1898 * block groups give us hints into the extent allocation trees. Which 1899 * blocks are free etc etc 1900 */ 1901 #define BTRFS_BLOCK_GROUP_ITEM_KEY 192 1902 1903 #define BTRFS_DEV_EXTENT_KEY 204 1904 #define BTRFS_DEV_ITEM_KEY 216 1905 #define BTRFS_CHUNK_ITEM_KEY 228 1906 1907 /* 1908 * Records the overall state of the qgroups. 1909 * There's only one instance of this key present, 1910 * (0, BTRFS_QGROUP_STATUS_KEY, 0) 1911 */ 1912 #define BTRFS_QGROUP_STATUS_KEY 240 1913 /* 1914 * Records the currently used space of the qgroup. 1915 * One key per qgroup, (0, BTRFS_QGROUP_INFO_KEY, qgroupid). 1916 */ 1917 #define BTRFS_QGROUP_INFO_KEY 242 1918 /* 1919 * Contains the user configured limits for the qgroup. 1920 * One key per qgroup, (0, BTRFS_QGROUP_LIMIT_KEY, qgroupid). 1921 */ 1922 #define BTRFS_QGROUP_LIMIT_KEY 244 1923 /* 1924 * Records the child-parent relationship of qgroups. For 1925 * each relation, 2 keys are present: 1926 * (childid, BTRFS_QGROUP_RELATION_KEY, parentid) 1927 * (parentid, BTRFS_QGROUP_RELATION_KEY, childid) 1928 */ 1929 #define BTRFS_QGROUP_RELATION_KEY 246 1930 1931 #define BTRFS_BALANCE_ITEM_KEY 248 1932 1933 /* 1934 * Persistantly stores the io stats in the device tree. 1935 * One key for all stats, (0, BTRFS_DEV_STATS_KEY, devid). 1936 */ 1937 #define BTRFS_DEV_STATS_KEY 249 1938 1939 /* 1940 * Persistantly stores the device replace state in the device tree. 1941 * The key is built like this: (0, BTRFS_DEV_REPLACE_KEY, 0). 1942 */ 1943 #define BTRFS_DEV_REPLACE_KEY 250 1944 1945 /* 1946 * Stores items that allow to quickly map UUIDs to something else. 1947 * These items are part of the filesystem UUID tree. 1948 * The key is built like this: 1949 * (UUID_upper_64_bits, BTRFS_UUID_KEY*, UUID_lower_64_bits). 1950 */ 1951 #if BTRFS_UUID_SIZE != 16 1952 #error "UUID items require BTRFS_UUID_SIZE == 16!" 1953 #endif 1954 #define BTRFS_UUID_KEY_SUBVOL 251 /* for UUIDs assigned to subvols */ 1955 #define BTRFS_UUID_KEY_RECEIVED_SUBVOL 252 /* for UUIDs assigned to 1956 * received subvols */ 1957 1958 /* 1959 * string items are for debugging. They just store a short string of 1960 * data in the FS 1961 */ 1962 #define BTRFS_STRING_ITEM_KEY 253 1963 1964 /* 1965 * Flags for mount options. 1966 * 1967 * Note: don't forget to add new options to btrfs_show_options() 1968 */ 1969 #define BTRFS_MOUNT_NODATASUM (1 << 0) 1970 #define BTRFS_MOUNT_NODATACOW (1 << 1) 1971 #define BTRFS_MOUNT_NOBARRIER (1 << 2) 1972 #define BTRFS_MOUNT_SSD (1 << 3) 1973 #define BTRFS_MOUNT_DEGRADED (1 << 4) 1974 #define BTRFS_MOUNT_COMPRESS (1 << 5) 1975 #define BTRFS_MOUNT_NOTREELOG (1 << 6) 1976 #define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7) 1977 #define BTRFS_MOUNT_SSD_SPREAD (1 << 8) 1978 #define BTRFS_MOUNT_NOSSD (1 << 9) 1979 #define BTRFS_MOUNT_DISCARD (1 << 10) 1980 #define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11) 1981 #define BTRFS_MOUNT_SPACE_CACHE (1 << 12) 1982 #define BTRFS_MOUNT_CLEAR_CACHE (1 << 13) 1983 #define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14) 1984 #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) 1985 #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) 1986 #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) 1987 #define BTRFS_MOUNT_RECOVERY (1 << 18) 1988 #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) 1989 #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) 1990 #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) 1991 #define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22) 1992 #define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23) 1993 1994 #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) 1995 1996 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) 1997 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) 1998 #define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt) 1999 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \ 2000 BTRFS_MOUNT_##opt) 2001 /* 2002 * Inode flags 2003 */ 2004 #define BTRFS_INODE_NODATASUM (1 << 0) 2005 #define BTRFS_INODE_NODATACOW (1 << 1) 2006 #define BTRFS_INODE_READONLY (1 << 2) 2007 #define BTRFS_INODE_NOCOMPRESS (1 << 3) 2008 #define BTRFS_INODE_PREALLOC (1 << 4) 2009 #define BTRFS_INODE_SYNC (1 << 5) 2010 #define BTRFS_INODE_IMMUTABLE (1 << 6) 2011 #define BTRFS_INODE_APPEND (1 << 7) 2012 #define BTRFS_INODE_NODUMP (1 << 8) 2013 #define BTRFS_INODE_NOATIME (1 << 9) 2014 #define BTRFS_INODE_DIRSYNC (1 << 10) 2015 #define BTRFS_INODE_COMPRESS (1 << 11) 2016 2017 #define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31) 2018 2019 struct btrfs_map_token { 2020 struct extent_buffer *eb; 2021 char *kaddr; 2022 unsigned long offset; 2023 }; 2024 2025 static inline void btrfs_init_map_token (struct btrfs_map_token *token) 2026 { 2027 token->kaddr = NULL; 2028 } 2029 2030 /* some macros to generate set/get funcs for the struct fields. This 2031 * assumes there is a lefoo_to_cpu for every type, so lets make a simple 2032 * one for u8: 2033 */ 2034 #define le8_to_cpu(v) (v) 2035 #define cpu_to_le8(v) (v) 2036 #define __le8 u8 2037 2038 #define read_eb_member(eb, ptr, type, member, result) ( \ 2039 read_extent_buffer(eb, (char *)(result), \ 2040 ((unsigned long)(ptr)) + \ 2041 offsetof(type, member), \ 2042 sizeof(((type *)0)->member))) 2043 2044 #define write_eb_member(eb, ptr, type, member, result) ( \ 2045 write_extent_buffer(eb, (char *)(result), \ 2046 ((unsigned long)(ptr)) + \ 2047 offsetof(type, member), \ 2048 sizeof(((type *)0)->member))) 2049 2050 #define DECLARE_BTRFS_SETGET_BITS(bits) \ 2051 u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \ 2052 unsigned long off, \ 2053 struct btrfs_map_token *token); \ 2054 void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \ 2055 unsigned long off, u##bits val, \ 2056 struct btrfs_map_token *token); \ 2057 static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \ 2058 unsigned long off) \ 2059 { \ 2060 return btrfs_get_token_##bits(eb, ptr, off, NULL); \ 2061 } \ 2062 static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \ 2063 unsigned long off, u##bits val) \ 2064 { \ 2065 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \ 2066 } 2067 2068 DECLARE_BTRFS_SETGET_BITS(8) 2069 DECLARE_BTRFS_SETGET_BITS(16) 2070 DECLARE_BTRFS_SETGET_BITS(32) 2071 DECLARE_BTRFS_SETGET_BITS(64) 2072 2073 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \ 2074 static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \ 2075 { \ 2076 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 2077 return btrfs_get_##bits(eb, s, offsetof(type, member)); \ 2078 } \ 2079 static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \ 2080 u##bits val) \ 2081 { \ 2082 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 2083 btrfs_set_##bits(eb, s, offsetof(type, member), val); \ 2084 } \ 2085 static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \ 2086 struct btrfs_map_token *token) \ 2087 { \ 2088 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 2089 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \ 2090 } \ 2091 static inline void btrfs_set_token_##name(struct extent_buffer *eb, \ 2092 type *s, u##bits val, \ 2093 struct btrfs_map_token *token) \ 2094 { \ 2095 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \ 2096 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \ 2097 } 2098 2099 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \ 2100 static inline u##bits btrfs_##name(struct extent_buffer *eb) \ 2101 { \ 2102 type *p = page_address(eb->pages[0]); \ 2103 u##bits res = le##bits##_to_cpu(p->member); \ 2104 return res; \ 2105 } \ 2106 static inline void btrfs_set_##name(struct extent_buffer *eb, \ 2107 u##bits val) \ 2108 { \ 2109 type *p = page_address(eb->pages[0]); \ 2110 p->member = cpu_to_le##bits(val); \ 2111 } 2112 2113 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \ 2114 static inline u##bits btrfs_##name(type *s) \ 2115 { \ 2116 return le##bits##_to_cpu(s->member); \ 2117 } \ 2118 static inline void btrfs_set_##name(type *s, u##bits val) \ 2119 { \ 2120 s->member = cpu_to_le##bits(val); \ 2121 } 2122 2123 BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64); 2124 BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64); 2125 BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64); 2126 BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32); 2127 BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32); 2128 BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item, 2129 start_offset, 64); 2130 BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32); 2131 BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64); 2132 BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32); 2133 BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8); 2134 BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8); 2135 BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64); 2136 2137 BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64); 2138 BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item, 2139 total_bytes, 64); 2140 BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item, 2141 bytes_used, 64); 2142 BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item, 2143 io_align, 32); 2144 BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item, 2145 io_width, 32); 2146 BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item, 2147 sector_size, 32); 2148 BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64); 2149 BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item, 2150 dev_group, 32); 2151 BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item, 2152 seek_speed, 8); 2153 BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item, 2154 bandwidth, 8); 2155 BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item, 2156 generation, 64); 2157 2158 static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d) 2159 { 2160 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid); 2161 } 2162 2163 static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d) 2164 { 2165 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid); 2166 } 2167 2168 BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64); 2169 BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64); 2170 BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64); 2171 BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32); 2172 BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32); 2173 BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32); 2174 BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64); 2175 BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16); 2176 BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16); 2177 BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64); 2178 BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64); 2179 2180 static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s) 2181 { 2182 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid); 2183 } 2184 2185 BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64); 2186 BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64); 2187 BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk, 2188 stripe_len, 64); 2189 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk, 2190 io_align, 32); 2191 BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk, 2192 io_width, 32); 2193 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk, 2194 sector_size, 32); 2195 BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64); 2196 BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk, 2197 num_stripes, 16); 2198 BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk, 2199 sub_stripes, 16); 2200 BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64); 2201 BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64); 2202 2203 static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c, 2204 int nr) 2205 { 2206 unsigned long offset = (unsigned long)c; 2207 offset += offsetof(struct btrfs_chunk, stripe); 2208 offset += nr * sizeof(struct btrfs_stripe); 2209 return (struct btrfs_stripe *)offset; 2210 } 2211 2212 static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr) 2213 { 2214 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr)); 2215 } 2216 2217 static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb, 2218 struct btrfs_chunk *c, int nr) 2219 { 2220 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr)); 2221 } 2222 2223 static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb, 2224 struct btrfs_chunk *c, int nr) 2225 { 2226 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr)); 2227 } 2228 2229 /* struct btrfs_block_group_item */ 2230 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item, 2231 used, 64); 2232 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item, 2233 used, 64); 2234 BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid, 2235 struct btrfs_block_group_item, chunk_objectid, 64); 2236 2237 BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid, 2238 struct btrfs_block_group_item, chunk_objectid, 64); 2239 BTRFS_SETGET_FUNCS(disk_block_group_flags, 2240 struct btrfs_block_group_item, flags, 64); 2241 BTRFS_SETGET_STACK_FUNCS(block_group_flags, 2242 struct btrfs_block_group_item, flags, 64); 2243 2244 /* struct btrfs_inode_ref */ 2245 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16); 2246 BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64); 2247 2248 /* struct btrfs_inode_extref */ 2249 BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref, 2250 parent_objectid, 64); 2251 BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref, 2252 name_len, 16); 2253 BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64); 2254 2255 /* struct btrfs_inode_item */ 2256 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64); 2257 BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64); 2258 BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64); 2259 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64); 2260 BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64); 2261 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64); 2262 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32); 2263 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32); 2264 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32); 2265 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32); 2266 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64); 2267 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64); 2268 BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item, 2269 generation, 64); 2270 BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item, 2271 sequence, 64); 2272 BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item, 2273 transid, 64); 2274 BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64); 2275 BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item, 2276 nbytes, 64); 2277 BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item, 2278 block_group, 64); 2279 BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32); 2280 BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32); 2281 BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32); 2282 BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32); 2283 BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64); 2284 BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64); 2285 2286 static inline struct btrfs_timespec * 2287 btrfs_inode_atime(struct btrfs_inode_item *inode_item) 2288 { 2289 unsigned long ptr = (unsigned long)inode_item; 2290 ptr += offsetof(struct btrfs_inode_item, atime); 2291 return (struct btrfs_timespec *)ptr; 2292 } 2293 2294 static inline struct btrfs_timespec * 2295 btrfs_inode_mtime(struct btrfs_inode_item *inode_item) 2296 { 2297 unsigned long ptr = (unsigned long)inode_item; 2298 ptr += offsetof(struct btrfs_inode_item, mtime); 2299 return (struct btrfs_timespec *)ptr; 2300 } 2301 2302 static inline struct btrfs_timespec * 2303 btrfs_inode_ctime(struct btrfs_inode_item *inode_item) 2304 { 2305 unsigned long ptr = (unsigned long)inode_item; 2306 ptr += offsetof(struct btrfs_inode_item, ctime); 2307 return (struct btrfs_timespec *)ptr; 2308 } 2309 2310 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64); 2311 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32); 2312 BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64); 2313 BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32); 2314 2315 /* struct btrfs_dev_extent */ 2316 BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent, 2317 chunk_tree, 64); 2318 BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent, 2319 chunk_objectid, 64); 2320 BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent, 2321 chunk_offset, 64); 2322 BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64); 2323 2324 static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev) 2325 { 2326 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid); 2327 return (unsigned long)dev + ptr; 2328 } 2329 2330 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64); 2331 BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item, 2332 generation, 64); 2333 BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64); 2334 2335 BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32); 2336 2337 2338 BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8); 2339 2340 static inline void btrfs_tree_block_key(struct extent_buffer *eb, 2341 struct btrfs_tree_block_info *item, 2342 struct btrfs_disk_key *key) 2343 { 2344 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 2345 } 2346 2347 static inline void btrfs_set_tree_block_key(struct extent_buffer *eb, 2348 struct btrfs_tree_block_info *item, 2349 struct btrfs_disk_key *key) 2350 { 2351 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key); 2352 } 2353 2354 BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref, 2355 root, 64); 2356 BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref, 2357 objectid, 64); 2358 BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref, 2359 offset, 64); 2360 BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref, 2361 count, 32); 2362 2363 BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref, 2364 count, 32); 2365 2366 BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref, 2367 type, 8); 2368 BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref, 2369 offset, 64); 2370 2371 static inline u32 btrfs_extent_inline_ref_size(int type) 2372 { 2373 if (type == BTRFS_TREE_BLOCK_REF_KEY || 2374 type == BTRFS_SHARED_BLOCK_REF_KEY) 2375 return sizeof(struct btrfs_extent_inline_ref); 2376 if (type == BTRFS_SHARED_DATA_REF_KEY) 2377 return sizeof(struct btrfs_shared_data_ref) + 2378 sizeof(struct btrfs_extent_inline_ref); 2379 if (type == BTRFS_EXTENT_DATA_REF_KEY) 2380 return sizeof(struct btrfs_extent_data_ref) + 2381 offsetof(struct btrfs_extent_inline_ref, offset); 2382 BUG(); 2383 return 0; 2384 } 2385 2386 BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64); 2387 BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0, 2388 generation, 64); 2389 BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64); 2390 BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32); 2391 2392 /* struct btrfs_node */ 2393 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64); 2394 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64); 2395 BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr, 2396 blockptr, 64); 2397 BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr, 2398 generation, 64); 2399 2400 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr) 2401 { 2402 unsigned long ptr; 2403 ptr = offsetof(struct btrfs_node, ptrs) + 2404 sizeof(struct btrfs_key_ptr) * nr; 2405 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr); 2406 } 2407 2408 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb, 2409 int nr, u64 val) 2410 { 2411 unsigned long ptr; 2412 ptr = offsetof(struct btrfs_node, ptrs) + 2413 sizeof(struct btrfs_key_ptr) * nr; 2414 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val); 2415 } 2416 2417 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr) 2418 { 2419 unsigned long ptr; 2420 ptr = offsetof(struct btrfs_node, ptrs) + 2421 sizeof(struct btrfs_key_ptr) * nr; 2422 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr); 2423 } 2424 2425 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb, 2426 int nr, u64 val) 2427 { 2428 unsigned long ptr; 2429 ptr = offsetof(struct btrfs_node, ptrs) + 2430 sizeof(struct btrfs_key_ptr) * nr; 2431 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val); 2432 } 2433 2434 static inline unsigned long btrfs_node_key_ptr_offset(int nr) 2435 { 2436 return offsetof(struct btrfs_node, ptrs) + 2437 sizeof(struct btrfs_key_ptr) * nr; 2438 } 2439 2440 void btrfs_node_key(struct extent_buffer *eb, 2441 struct btrfs_disk_key *disk_key, int nr); 2442 2443 static inline void btrfs_set_node_key(struct extent_buffer *eb, 2444 struct btrfs_disk_key *disk_key, int nr) 2445 { 2446 unsigned long ptr; 2447 ptr = btrfs_node_key_ptr_offset(nr); 2448 write_eb_member(eb, (struct btrfs_key_ptr *)ptr, 2449 struct btrfs_key_ptr, key, disk_key); 2450 } 2451 2452 /* struct btrfs_item */ 2453 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32); 2454 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32); 2455 BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32); 2456 BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32); 2457 2458 static inline unsigned long btrfs_item_nr_offset(int nr) 2459 { 2460 return offsetof(struct btrfs_leaf, items) + 2461 sizeof(struct btrfs_item) * nr; 2462 } 2463 2464 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb, 2465 int nr) 2466 { 2467 return (struct btrfs_item *)btrfs_item_nr_offset(nr); 2468 } 2469 2470 static inline u32 btrfs_item_end(struct extent_buffer *eb, 2471 struct btrfs_item *item) 2472 { 2473 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item); 2474 } 2475 2476 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr) 2477 { 2478 return btrfs_item_end(eb, btrfs_item_nr(eb, nr)); 2479 } 2480 2481 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr) 2482 { 2483 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr)); 2484 } 2485 2486 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr) 2487 { 2488 return btrfs_item_size(eb, btrfs_item_nr(eb, nr)); 2489 } 2490 2491 static inline void btrfs_item_key(struct extent_buffer *eb, 2492 struct btrfs_disk_key *disk_key, int nr) 2493 { 2494 struct btrfs_item *item = btrfs_item_nr(eb, nr); 2495 read_eb_member(eb, item, struct btrfs_item, key, disk_key); 2496 } 2497 2498 static inline void btrfs_set_item_key(struct extent_buffer *eb, 2499 struct btrfs_disk_key *disk_key, int nr) 2500 { 2501 struct btrfs_item *item = btrfs_item_nr(eb, nr); 2502 write_eb_member(eb, item, struct btrfs_item, key, disk_key); 2503 } 2504 2505 BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64); 2506 2507 /* 2508 * struct btrfs_root_ref 2509 */ 2510 BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64); 2511 BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64); 2512 BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16); 2513 2514 /* struct btrfs_dir_item */ 2515 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16); 2516 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8); 2517 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16); 2518 BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64); 2519 BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8); 2520 BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item, 2521 data_len, 16); 2522 BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item, 2523 name_len, 16); 2524 BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item, 2525 transid, 64); 2526 2527 static inline void btrfs_dir_item_key(struct extent_buffer *eb, 2528 struct btrfs_dir_item *item, 2529 struct btrfs_disk_key *key) 2530 { 2531 read_eb_member(eb, item, struct btrfs_dir_item, location, key); 2532 } 2533 2534 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb, 2535 struct btrfs_dir_item *item, 2536 struct btrfs_disk_key *key) 2537 { 2538 write_eb_member(eb, item, struct btrfs_dir_item, location, key); 2539 } 2540 2541 BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header, 2542 num_entries, 64); 2543 BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header, 2544 num_bitmaps, 64); 2545 BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header, 2546 generation, 64); 2547 2548 static inline void btrfs_free_space_key(struct extent_buffer *eb, 2549 struct btrfs_free_space_header *h, 2550 struct btrfs_disk_key *key) 2551 { 2552 read_eb_member(eb, h, struct btrfs_free_space_header, location, key); 2553 } 2554 2555 static inline void btrfs_set_free_space_key(struct extent_buffer *eb, 2556 struct btrfs_free_space_header *h, 2557 struct btrfs_disk_key *key) 2558 { 2559 write_eb_member(eb, h, struct btrfs_free_space_header, location, key); 2560 } 2561 2562 /* struct btrfs_disk_key */ 2563 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key, 2564 objectid, 64); 2565 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64); 2566 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8); 2567 2568 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu, 2569 struct btrfs_disk_key *disk) 2570 { 2571 cpu->offset = le64_to_cpu(disk->offset); 2572 cpu->type = disk->type; 2573 cpu->objectid = le64_to_cpu(disk->objectid); 2574 } 2575 2576 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk, 2577 struct btrfs_key *cpu) 2578 { 2579 disk->offset = cpu_to_le64(cpu->offset); 2580 disk->type = cpu->type; 2581 disk->objectid = cpu_to_le64(cpu->objectid); 2582 } 2583 2584 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb, 2585 struct btrfs_key *key, int nr) 2586 { 2587 struct btrfs_disk_key disk_key; 2588 btrfs_node_key(eb, &disk_key, nr); 2589 btrfs_disk_key_to_cpu(key, &disk_key); 2590 } 2591 2592 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb, 2593 struct btrfs_key *key, int nr) 2594 { 2595 struct btrfs_disk_key disk_key; 2596 btrfs_item_key(eb, &disk_key, nr); 2597 btrfs_disk_key_to_cpu(key, &disk_key); 2598 } 2599 2600 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb, 2601 struct btrfs_dir_item *item, 2602 struct btrfs_key *key) 2603 { 2604 struct btrfs_disk_key disk_key; 2605 btrfs_dir_item_key(eb, item, &disk_key); 2606 btrfs_disk_key_to_cpu(key, &disk_key); 2607 } 2608 2609 2610 static inline u8 btrfs_key_type(struct btrfs_key *key) 2611 { 2612 return key->type; 2613 } 2614 2615 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val) 2616 { 2617 key->type = val; 2618 } 2619 2620 /* struct btrfs_header */ 2621 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64); 2622 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header, 2623 generation, 64); 2624 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64); 2625 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32); 2626 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64); 2627 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8); 2628 BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header, 2629 generation, 64); 2630 BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64); 2631 BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header, 2632 nritems, 32); 2633 BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64); 2634 2635 static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag) 2636 { 2637 return (btrfs_header_flags(eb) & flag) == flag; 2638 } 2639 2640 static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag) 2641 { 2642 u64 flags = btrfs_header_flags(eb); 2643 btrfs_set_header_flags(eb, flags | flag); 2644 return (flags & flag) == flag; 2645 } 2646 2647 static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag) 2648 { 2649 u64 flags = btrfs_header_flags(eb); 2650 btrfs_set_header_flags(eb, flags & ~flag); 2651 return (flags & flag) == flag; 2652 } 2653 2654 static inline int btrfs_header_backref_rev(struct extent_buffer *eb) 2655 { 2656 u64 flags = btrfs_header_flags(eb); 2657 return flags >> BTRFS_BACKREF_REV_SHIFT; 2658 } 2659 2660 static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb, 2661 int rev) 2662 { 2663 u64 flags = btrfs_header_flags(eb); 2664 flags &= ~BTRFS_BACKREF_REV_MASK; 2665 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT; 2666 btrfs_set_header_flags(eb, flags); 2667 } 2668 2669 static inline unsigned long btrfs_header_fsid(struct extent_buffer *eb) 2670 { 2671 return offsetof(struct btrfs_header, fsid); 2672 } 2673 2674 static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb) 2675 { 2676 return offsetof(struct btrfs_header, chunk_tree_uuid); 2677 } 2678 2679 static inline int btrfs_is_leaf(struct extent_buffer *eb) 2680 { 2681 return btrfs_header_level(eb) == 0; 2682 } 2683 2684 /* struct btrfs_root_item */ 2685 BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item, 2686 generation, 64); 2687 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32); 2688 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64); 2689 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8); 2690 2691 BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item, 2692 generation, 64); 2693 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64); 2694 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8); 2695 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64); 2696 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32); 2697 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64); 2698 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64); 2699 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64); 2700 BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item, 2701 last_snapshot, 64); 2702 BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item, 2703 generation_v2, 64); 2704 BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item, 2705 ctransid, 64); 2706 BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item, 2707 otransid, 64); 2708 BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item, 2709 stransid, 64); 2710 BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item, 2711 rtransid, 64); 2712 2713 static inline bool btrfs_root_readonly(struct btrfs_root *root) 2714 { 2715 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0; 2716 } 2717 2718 /* struct btrfs_root_backup */ 2719 BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup, 2720 tree_root, 64); 2721 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup, 2722 tree_root_gen, 64); 2723 BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup, 2724 tree_root_level, 8); 2725 2726 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup, 2727 chunk_root, 64); 2728 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup, 2729 chunk_root_gen, 64); 2730 BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup, 2731 chunk_root_level, 8); 2732 2733 BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup, 2734 extent_root, 64); 2735 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup, 2736 extent_root_gen, 64); 2737 BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup, 2738 extent_root_level, 8); 2739 2740 BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup, 2741 fs_root, 64); 2742 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup, 2743 fs_root_gen, 64); 2744 BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup, 2745 fs_root_level, 8); 2746 2747 BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup, 2748 dev_root, 64); 2749 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup, 2750 dev_root_gen, 64); 2751 BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup, 2752 dev_root_level, 8); 2753 2754 BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup, 2755 csum_root, 64); 2756 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup, 2757 csum_root_gen, 64); 2758 BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup, 2759 csum_root_level, 8); 2760 BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup, 2761 total_bytes, 64); 2762 BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup, 2763 bytes_used, 64); 2764 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup, 2765 num_devices, 64); 2766 2767 /* struct btrfs_balance_item */ 2768 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64); 2769 2770 static inline void btrfs_balance_data(struct extent_buffer *eb, 2771 struct btrfs_balance_item *bi, 2772 struct btrfs_disk_balance_args *ba) 2773 { 2774 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2775 } 2776 2777 static inline void btrfs_set_balance_data(struct extent_buffer *eb, 2778 struct btrfs_balance_item *bi, 2779 struct btrfs_disk_balance_args *ba) 2780 { 2781 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba); 2782 } 2783 2784 static inline void btrfs_balance_meta(struct extent_buffer *eb, 2785 struct btrfs_balance_item *bi, 2786 struct btrfs_disk_balance_args *ba) 2787 { 2788 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2789 } 2790 2791 static inline void btrfs_set_balance_meta(struct extent_buffer *eb, 2792 struct btrfs_balance_item *bi, 2793 struct btrfs_disk_balance_args *ba) 2794 { 2795 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba); 2796 } 2797 2798 static inline void btrfs_balance_sys(struct extent_buffer *eb, 2799 struct btrfs_balance_item *bi, 2800 struct btrfs_disk_balance_args *ba) 2801 { 2802 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2803 } 2804 2805 static inline void btrfs_set_balance_sys(struct extent_buffer *eb, 2806 struct btrfs_balance_item *bi, 2807 struct btrfs_disk_balance_args *ba) 2808 { 2809 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba); 2810 } 2811 2812 static inline void 2813 btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu, 2814 struct btrfs_disk_balance_args *disk) 2815 { 2816 memset(cpu, 0, sizeof(*cpu)); 2817 2818 cpu->profiles = le64_to_cpu(disk->profiles); 2819 cpu->usage = le64_to_cpu(disk->usage); 2820 cpu->devid = le64_to_cpu(disk->devid); 2821 cpu->pstart = le64_to_cpu(disk->pstart); 2822 cpu->pend = le64_to_cpu(disk->pend); 2823 cpu->vstart = le64_to_cpu(disk->vstart); 2824 cpu->vend = le64_to_cpu(disk->vend); 2825 cpu->target = le64_to_cpu(disk->target); 2826 cpu->flags = le64_to_cpu(disk->flags); 2827 } 2828 2829 static inline void 2830 btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk, 2831 struct btrfs_balance_args *cpu) 2832 { 2833 memset(disk, 0, sizeof(*disk)); 2834 2835 disk->profiles = cpu_to_le64(cpu->profiles); 2836 disk->usage = cpu_to_le64(cpu->usage); 2837 disk->devid = cpu_to_le64(cpu->devid); 2838 disk->pstart = cpu_to_le64(cpu->pstart); 2839 disk->pend = cpu_to_le64(cpu->pend); 2840 disk->vstart = cpu_to_le64(cpu->vstart); 2841 disk->vend = cpu_to_le64(cpu->vend); 2842 disk->target = cpu_to_le64(cpu->target); 2843 disk->flags = cpu_to_le64(cpu->flags); 2844 } 2845 2846 /* struct btrfs_super_block */ 2847 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64); 2848 BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64); 2849 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block, 2850 generation, 64); 2851 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64); 2852 BTRFS_SETGET_STACK_FUNCS(super_sys_array_size, 2853 struct btrfs_super_block, sys_chunk_array_size, 32); 2854 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation, 2855 struct btrfs_super_block, chunk_root_generation, 64); 2856 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block, 2857 root_level, 8); 2858 BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block, 2859 chunk_root, 64); 2860 BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block, 2861 chunk_root_level, 8); 2862 BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block, 2863 log_root, 64); 2864 BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block, 2865 log_root_transid, 64); 2866 BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block, 2867 log_root_level, 8); 2868 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block, 2869 total_bytes, 64); 2870 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block, 2871 bytes_used, 64); 2872 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block, 2873 sectorsize, 32); 2874 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block, 2875 nodesize, 32); 2876 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block, 2877 leafsize, 32); 2878 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block, 2879 stripesize, 32); 2880 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block, 2881 root_dir_objectid, 64); 2882 BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block, 2883 num_devices, 64); 2884 BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block, 2885 compat_flags, 64); 2886 BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block, 2887 compat_ro_flags, 64); 2888 BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block, 2889 incompat_flags, 64); 2890 BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block, 2891 csum_type, 16); 2892 BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block, 2893 cache_generation, 64); 2894 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64); 2895 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block, 2896 uuid_tree_generation, 64); 2897 2898 static inline int btrfs_super_csum_size(struct btrfs_super_block *s) 2899 { 2900 u16 t = btrfs_super_csum_type(s); 2901 /* 2902 * csum type is validated at mount time 2903 */ 2904 return btrfs_csum_sizes[t]; 2905 } 2906 2907 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l) 2908 { 2909 return offsetof(struct btrfs_leaf, items); 2910 } 2911 2912 /* struct btrfs_file_extent_item */ 2913 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8); 2914 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr, 2915 struct btrfs_file_extent_item, disk_bytenr, 64); 2916 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset, 2917 struct btrfs_file_extent_item, offset, 64); 2918 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation, 2919 struct btrfs_file_extent_item, generation, 64); 2920 BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes, 2921 struct btrfs_file_extent_item, num_bytes, 64); 2922 2923 static inline unsigned long 2924 btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e) 2925 { 2926 unsigned long offset = (unsigned long)e; 2927 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr); 2928 return offset; 2929 } 2930 2931 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize) 2932 { 2933 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize; 2934 } 2935 2936 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item, 2937 disk_bytenr, 64); 2938 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item, 2939 generation, 64); 2940 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item, 2941 disk_num_bytes, 64); 2942 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item, 2943 offset, 64); 2944 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item, 2945 num_bytes, 64); 2946 BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item, 2947 ram_bytes, 64); 2948 BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item, 2949 compression, 8); 2950 BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item, 2951 encryption, 8); 2952 BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item, 2953 other_encoding, 16); 2954 2955 /* this returns the number of file bytes represented by the inline item. 2956 * If an item is compressed, this is the uncompressed size 2957 */ 2958 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb, 2959 struct btrfs_file_extent_item *e) 2960 { 2961 return btrfs_file_extent_ram_bytes(eb, e); 2962 } 2963 2964 /* 2965 * this returns the number of bytes used by the item on disk, minus the 2966 * size of any extent headers. If a file is compressed on disk, this is 2967 * the compressed size 2968 */ 2969 static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb, 2970 struct btrfs_item *e) 2971 { 2972 unsigned long offset; 2973 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr); 2974 return btrfs_item_size(eb, e) - offset; 2975 } 2976 2977 /* btrfs_dev_stats_item */ 2978 static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb, 2979 struct btrfs_dev_stats_item *ptr, 2980 int index) 2981 { 2982 u64 val; 2983 2984 read_extent_buffer(eb, &val, 2985 offsetof(struct btrfs_dev_stats_item, values) + 2986 ((unsigned long)ptr) + (index * sizeof(u64)), 2987 sizeof(val)); 2988 return val; 2989 } 2990 2991 static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb, 2992 struct btrfs_dev_stats_item *ptr, 2993 int index, u64 val) 2994 { 2995 write_extent_buffer(eb, &val, 2996 offsetof(struct btrfs_dev_stats_item, values) + 2997 ((unsigned long)ptr) + (index * sizeof(u64)), 2998 sizeof(val)); 2999 } 3000 3001 /* btrfs_qgroup_status_item */ 3002 BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item, 3003 generation, 64); 3004 BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item, 3005 version, 64); 3006 BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item, 3007 flags, 64); 3008 BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item, 3009 rescan, 64); 3010 3011 /* btrfs_qgroup_info_item */ 3012 BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item, 3013 generation, 64); 3014 BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64); 3015 BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item, 3016 rfer_cmpr, 64); 3017 BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64); 3018 BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item, 3019 excl_cmpr, 64); 3020 3021 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation, 3022 struct btrfs_qgroup_info_item, generation, 64); 3023 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item, 3024 rfer, 64); 3025 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr, 3026 struct btrfs_qgroup_info_item, rfer_cmpr, 64); 3027 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item, 3028 excl, 64); 3029 BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr, 3030 struct btrfs_qgroup_info_item, excl_cmpr, 64); 3031 3032 /* btrfs_qgroup_limit_item */ 3033 BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item, 3034 flags, 64); 3035 BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item, 3036 max_rfer, 64); 3037 BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item, 3038 max_excl, 64); 3039 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item, 3040 rsv_rfer, 64); 3041 BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item, 3042 rsv_excl, 64); 3043 3044 /* btrfs_dev_replace_item */ 3045 BTRFS_SETGET_FUNCS(dev_replace_src_devid, 3046 struct btrfs_dev_replace_item, src_devid, 64); 3047 BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode, 3048 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode, 3049 64); 3050 BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item, 3051 replace_state, 64); 3052 BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item, 3053 time_started, 64); 3054 BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item, 3055 time_stopped, 64); 3056 BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item, 3057 num_write_errors, 64); 3058 BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors, 3059 struct btrfs_dev_replace_item, num_uncorrectable_read_errors, 3060 64); 3061 BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item, 3062 cursor_left, 64); 3063 BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item, 3064 cursor_right, 64); 3065 3066 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid, 3067 struct btrfs_dev_replace_item, src_devid, 64); 3068 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode, 3069 struct btrfs_dev_replace_item, 3070 cont_reading_from_srcdev_mode, 64); 3071 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state, 3072 struct btrfs_dev_replace_item, replace_state, 64); 3073 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started, 3074 struct btrfs_dev_replace_item, time_started, 64); 3075 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped, 3076 struct btrfs_dev_replace_item, time_stopped, 64); 3077 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors, 3078 struct btrfs_dev_replace_item, num_write_errors, 64); 3079 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors, 3080 struct btrfs_dev_replace_item, 3081 num_uncorrectable_read_errors, 64); 3082 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left, 3083 struct btrfs_dev_replace_item, cursor_left, 64); 3084 BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right, 3085 struct btrfs_dev_replace_item, cursor_right, 64); 3086 3087 static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb) 3088 { 3089 return sb->s_fs_info; 3090 } 3091 3092 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) 3093 { 3094 if (level == 0) 3095 return root->leafsize; 3096 return root->nodesize; 3097 } 3098 3099 /* helper function to cast into the data area of the leaf. */ 3100 #define btrfs_item_ptr(leaf, slot, type) \ 3101 ((type *)(btrfs_leaf_data(leaf) + \ 3102 btrfs_item_offset_nr(leaf, slot))) 3103 3104 #define btrfs_item_ptr_offset(leaf, slot) \ 3105 ((unsigned long)(btrfs_leaf_data(leaf) + \ 3106 btrfs_item_offset_nr(leaf, slot))) 3107 3108 static inline struct dentry *fdentry(struct file *file) 3109 { 3110 return file->f_path.dentry; 3111 } 3112 3113 static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info) 3114 { 3115 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) && 3116 (space_info->flags & BTRFS_BLOCK_GROUP_DATA)); 3117 } 3118 3119 static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping) 3120 { 3121 return mapping_gfp_mask(mapping) & ~__GFP_FS; 3122 } 3123 3124 /* extent-tree.c */ 3125 static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root, 3126 unsigned num_items) 3127 { 3128 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * 3129 2 * num_items; 3130 } 3131 3132 /* 3133 * Doing a truncate won't result in new nodes or leaves, just what we need for 3134 * COW. 3135 */ 3136 static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_root *root, 3137 unsigned num_items) 3138 { 3139 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) * 3140 num_items; 3141 } 3142 3143 int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans, 3144 struct btrfs_root *root); 3145 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 3146 int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans, 3147 struct btrfs_root *root, unsigned long count); 3148 int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len); 3149 int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans, 3150 struct btrfs_root *root, u64 bytenr, 3151 u64 offset, int metadata, u64 *refs, u64 *flags); 3152 int btrfs_pin_extent(struct btrfs_root *root, 3153 u64 bytenr, u64 num, int reserved); 3154 int btrfs_pin_extent_for_log_replay(struct btrfs_root *root, 3155 u64 bytenr, u64 num_bytes); 3156 int btrfs_exclude_logged_extents(struct btrfs_root *root, 3157 struct extent_buffer *eb); 3158 int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans, 3159 struct btrfs_root *root, 3160 u64 objectid, u64 offset, u64 bytenr); 3161 struct btrfs_block_group_cache *btrfs_lookup_block_group( 3162 struct btrfs_fs_info *info, 3163 u64 bytenr); 3164 void btrfs_put_block_group(struct btrfs_block_group_cache *cache); 3165 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans, 3166 struct btrfs_root *root, u32 blocksize, 3167 u64 parent, u64 root_objectid, 3168 struct btrfs_disk_key *key, int level, 3169 u64 hint, u64 empty_size); 3170 void btrfs_free_tree_block(struct btrfs_trans_handle *trans, 3171 struct btrfs_root *root, 3172 struct extent_buffer *buf, 3173 u64 parent, int last_ref); 3174 int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans, 3175 struct btrfs_root *root, 3176 u64 root_objectid, u64 owner, 3177 u64 offset, struct btrfs_key *ins); 3178 int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans, 3179 struct btrfs_root *root, 3180 u64 root_objectid, u64 owner, u64 offset, 3181 struct btrfs_key *ins); 3182 int btrfs_reserve_extent(struct btrfs_root *root, u64 num_bytes, 3183 u64 min_alloc_size, u64 empty_size, u64 hint_byte, 3184 struct btrfs_key *ins, int is_data); 3185 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3186 struct extent_buffer *buf, int full_backref, int for_cow); 3187 int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3188 struct extent_buffer *buf, int full_backref, int for_cow); 3189 int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans, 3190 struct btrfs_root *root, 3191 u64 bytenr, u64 num_bytes, u64 flags, 3192 int level, int is_data); 3193 int btrfs_free_extent(struct btrfs_trans_handle *trans, 3194 struct btrfs_root *root, 3195 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid, 3196 u64 owner, u64 offset, int for_cow); 3197 3198 int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len); 3199 int btrfs_free_and_pin_reserved_extent(struct btrfs_root *root, 3200 u64 start, u64 len); 3201 void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans, 3202 struct btrfs_root *root); 3203 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, 3204 struct btrfs_root *root); 3205 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, 3206 struct btrfs_root *root, 3207 u64 bytenr, u64 num_bytes, u64 parent, 3208 u64 root_objectid, u64 owner, u64 offset, int for_cow); 3209 3210 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans, 3211 struct btrfs_root *root); 3212 int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr); 3213 int btrfs_free_block_groups(struct btrfs_fs_info *info); 3214 int btrfs_read_block_groups(struct btrfs_root *root); 3215 int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr); 3216 int btrfs_make_block_group(struct btrfs_trans_handle *trans, 3217 struct btrfs_root *root, u64 bytes_used, 3218 u64 type, u64 chunk_objectid, u64 chunk_offset, 3219 u64 size); 3220 int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 3221 struct btrfs_root *root, u64 group_start); 3222 void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans, 3223 struct btrfs_root *root); 3224 u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data); 3225 void btrfs_clear_space_info_full(struct btrfs_fs_info *info); 3226 3227 enum btrfs_reserve_flush_enum { 3228 /* If we are in the transaction, we can't flush anything.*/ 3229 BTRFS_RESERVE_NO_FLUSH, 3230 /* 3231 * Flushing delalloc may cause deadlock somewhere, in this 3232 * case, use FLUSH LIMIT 3233 */ 3234 BTRFS_RESERVE_FLUSH_LIMIT, 3235 BTRFS_RESERVE_FLUSH_ALL, 3236 }; 3237 3238 int btrfs_check_data_free_space(struct inode *inode, u64 bytes); 3239 void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes); 3240 void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans, 3241 struct btrfs_root *root); 3242 int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans, 3243 struct inode *inode); 3244 void btrfs_orphan_release_metadata(struct inode *inode); 3245 int btrfs_subvolume_reserve_metadata(struct btrfs_root *root, 3246 struct btrfs_block_rsv *rsv, 3247 int nitems, 3248 u64 *qgroup_reserved, bool use_global_rsv); 3249 void btrfs_subvolume_release_metadata(struct btrfs_root *root, 3250 struct btrfs_block_rsv *rsv, 3251 u64 qgroup_reserved); 3252 int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes); 3253 void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes); 3254 int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes); 3255 void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes); 3256 void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type); 3257 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root, 3258 unsigned short type); 3259 void btrfs_free_block_rsv(struct btrfs_root *root, 3260 struct btrfs_block_rsv *rsv); 3261 int btrfs_block_rsv_add(struct btrfs_root *root, 3262 struct btrfs_block_rsv *block_rsv, u64 num_bytes, 3263 enum btrfs_reserve_flush_enum flush); 3264 int btrfs_block_rsv_check(struct btrfs_root *root, 3265 struct btrfs_block_rsv *block_rsv, int min_factor); 3266 int btrfs_block_rsv_refill(struct btrfs_root *root, 3267 struct btrfs_block_rsv *block_rsv, u64 min_reserved, 3268 enum btrfs_reserve_flush_enum flush); 3269 int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv, 3270 struct btrfs_block_rsv *dst_rsv, 3271 u64 num_bytes); 3272 int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info, 3273 struct btrfs_block_rsv *dest, u64 num_bytes, 3274 int min_factor); 3275 void btrfs_block_rsv_release(struct btrfs_root *root, 3276 struct btrfs_block_rsv *block_rsv, 3277 u64 num_bytes); 3278 int btrfs_set_block_group_ro(struct btrfs_root *root, 3279 struct btrfs_block_group_cache *cache); 3280 void btrfs_set_block_group_rw(struct btrfs_root *root, 3281 struct btrfs_block_group_cache *cache); 3282 void btrfs_put_block_group_cache(struct btrfs_fs_info *info); 3283 u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo); 3284 int btrfs_error_unpin_extent_range(struct btrfs_root *root, 3285 u64 start, u64 end); 3286 int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr, 3287 u64 num_bytes, u64 *actual_bytes); 3288 int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans, 3289 struct btrfs_root *root, u64 type); 3290 int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range); 3291 3292 int btrfs_init_space_info(struct btrfs_fs_info *fs_info); 3293 int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans, 3294 struct btrfs_fs_info *fs_info); 3295 int __get_raid_index(u64 flags); 3296 /* ctree.c */ 3297 int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key, 3298 int level, int *slot); 3299 int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2); 3300 int btrfs_previous_item(struct btrfs_root *root, 3301 struct btrfs_path *path, u64 min_objectid, 3302 int type); 3303 void btrfs_set_item_key_safe(struct btrfs_root *root, struct btrfs_path *path, 3304 struct btrfs_key *new_key); 3305 struct extent_buffer *btrfs_root_node(struct btrfs_root *root); 3306 struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root); 3307 int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path, 3308 struct btrfs_key *key, int lowest_level, 3309 u64 min_trans); 3310 int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 3311 struct btrfs_key *max_key, 3312 struct btrfs_path *path, 3313 u64 min_trans); 3314 enum btrfs_compare_tree_result { 3315 BTRFS_COMPARE_TREE_NEW, 3316 BTRFS_COMPARE_TREE_DELETED, 3317 BTRFS_COMPARE_TREE_CHANGED, 3318 BTRFS_COMPARE_TREE_SAME, 3319 }; 3320 typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root, 3321 struct btrfs_root *right_root, 3322 struct btrfs_path *left_path, 3323 struct btrfs_path *right_path, 3324 struct btrfs_key *key, 3325 enum btrfs_compare_tree_result result, 3326 void *ctx); 3327 int btrfs_compare_trees(struct btrfs_root *left_root, 3328 struct btrfs_root *right_root, 3329 btrfs_changed_cb_t cb, void *ctx); 3330 int btrfs_cow_block(struct btrfs_trans_handle *trans, 3331 struct btrfs_root *root, struct extent_buffer *buf, 3332 struct extent_buffer *parent, int parent_slot, 3333 struct extent_buffer **cow_ret); 3334 int btrfs_copy_root(struct btrfs_trans_handle *trans, 3335 struct btrfs_root *root, 3336 struct extent_buffer *buf, 3337 struct extent_buffer **cow_ret, u64 new_root_objectid); 3338 int btrfs_block_can_be_shared(struct btrfs_root *root, 3339 struct extent_buffer *buf); 3340 void btrfs_extend_item(struct btrfs_root *root, struct btrfs_path *path, 3341 u32 data_size); 3342 void btrfs_truncate_item(struct btrfs_root *root, struct btrfs_path *path, 3343 u32 new_size, int from_end); 3344 int btrfs_split_item(struct btrfs_trans_handle *trans, 3345 struct btrfs_root *root, 3346 struct btrfs_path *path, 3347 struct btrfs_key *new_key, 3348 unsigned long split_offset); 3349 int btrfs_duplicate_item(struct btrfs_trans_handle *trans, 3350 struct btrfs_root *root, 3351 struct btrfs_path *path, 3352 struct btrfs_key *new_key); 3353 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root 3354 *root, struct btrfs_key *key, struct btrfs_path *p, int 3355 ins_len, int cow); 3356 int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key, 3357 struct btrfs_path *p, u64 time_seq); 3358 int btrfs_search_slot_for_read(struct btrfs_root *root, 3359 struct btrfs_key *key, struct btrfs_path *p, 3360 int find_higher, int return_any); 3361 int btrfs_realloc_node(struct btrfs_trans_handle *trans, 3362 struct btrfs_root *root, struct extent_buffer *parent, 3363 int start_slot, u64 *last_ret, 3364 struct btrfs_key *progress); 3365 void btrfs_release_path(struct btrfs_path *p); 3366 struct btrfs_path *btrfs_alloc_path(void); 3367 void btrfs_free_path(struct btrfs_path *p); 3368 void btrfs_set_path_blocking(struct btrfs_path *p); 3369 void btrfs_clear_path_blocking(struct btrfs_path *p, 3370 struct extent_buffer *held, int held_rw); 3371 void btrfs_unlock_up_safe(struct btrfs_path *p, int level); 3372 3373 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3374 struct btrfs_path *path, int slot, int nr); 3375 static inline int btrfs_del_item(struct btrfs_trans_handle *trans, 3376 struct btrfs_root *root, 3377 struct btrfs_path *path) 3378 { 3379 return btrfs_del_items(trans, root, path, path->slots[0], 1); 3380 } 3381 3382 void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path, 3383 struct btrfs_key *cpu_key, u32 *data_size, 3384 u32 total_data, u32 total_size, int nr); 3385 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root 3386 *root, struct btrfs_key *key, void *data, u32 data_size); 3387 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans, 3388 struct btrfs_root *root, 3389 struct btrfs_path *path, 3390 struct btrfs_key *cpu_key, u32 *data_size, int nr); 3391 3392 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, 3393 struct btrfs_root *root, 3394 struct btrfs_path *path, 3395 struct btrfs_key *key, 3396 u32 data_size) 3397 { 3398 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1); 3399 } 3400 3401 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); 3402 int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path, 3403 u64 time_seq); 3404 static inline int btrfs_next_old_item(struct btrfs_root *root, 3405 struct btrfs_path *p, u64 time_seq) 3406 { 3407 ++p->slots[0]; 3408 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0])) 3409 return btrfs_next_old_leaf(root, p, time_seq); 3410 return 0; 3411 } 3412 static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p) 3413 { 3414 return btrfs_next_old_item(root, p, 0); 3415 } 3416 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); 3417 int __must_check btrfs_drop_snapshot(struct btrfs_root *root, 3418 struct btrfs_block_rsv *block_rsv, 3419 int update_ref, int for_reloc); 3420 int btrfs_drop_subtree(struct btrfs_trans_handle *trans, 3421 struct btrfs_root *root, 3422 struct extent_buffer *node, 3423 struct extent_buffer *parent); 3424 static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info) 3425 { 3426 /* 3427 * Get synced with close_ctree() 3428 */ 3429 smp_mb(); 3430 return fs_info->closing; 3431 } 3432 3433 /* 3434 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do 3435 * anything except sleeping. This function is used to check the status of 3436 * the fs. 3437 */ 3438 static inline int btrfs_need_cleaner_sleep(struct btrfs_root *root) 3439 { 3440 return (root->fs_info->sb->s_flags & MS_RDONLY || 3441 btrfs_fs_closing(root->fs_info)); 3442 } 3443 3444 static inline void free_fs_info(struct btrfs_fs_info *fs_info) 3445 { 3446 kfree(fs_info->balance_ctl); 3447 kfree(fs_info->delayed_root); 3448 kfree(fs_info->extent_root); 3449 kfree(fs_info->tree_root); 3450 kfree(fs_info->chunk_root); 3451 kfree(fs_info->dev_root); 3452 kfree(fs_info->csum_root); 3453 kfree(fs_info->quota_root); 3454 kfree(fs_info->uuid_root); 3455 kfree(fs_info->super_copy); 3456 kfree(fs_info->super_for_commit); 3457 kfree(fs_info); 3458 } 3459 3460 /* tree mod log functions from ctree.c */ 3461 u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info, 3462 struct seq_list *elem); 3463 void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info, 3464 struct seq_list *elem); 3465 u64 btrfs_tree_mod_seq_prev(u64 seq); 3466 int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq); 3467 3468 /* root-item.c */ 3469 int btrfs_find_root_ref(struct btrfs_root *tree_root, 3470 struct btrfs_path *path, 3471 u64 root_id, u64 ref_id); 3472 int btrfs_add_root_ref(struct btrfs_trans_handle *trans, 3473 struct btrfs_root *tree_root, 3474 u64 root_id, u64 ref_id, u64 dirid, u64 sequence, 3475 const char *name, int name_len); 3476 int btrfs_del_root_ref(struct btrfs_trans_handle *trans, 3477 struct btrfs_root *tree_root, 3478 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence, 3479 const char *name, int name_len); 3480 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, 3481 struct btrfs_key *key); 3482 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root 3483 *root, struct btrfs_key *key, struct btrfs_root_item 3484 *item); 3485 int __must_check btrfs_update_root(struct btrfs_trans_handle *trans, 3486 struct btrfs_root *root, 3487 struct btrfs_key *key, 3488 struct btrfs_root_item *item); 3489 int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key, 3490 struct btrfs_path *path, struct btrfs_root_item *root_item, 3491 struct btrfs_key *root_key); 3492 int btrfs_find_orphan_roots(struct btrfs_root *tree_root); 3493 void btrfs_set_root_node(struct btrfs_root_item *item, 3494 struct extent_buffer *node); 3495 void btrfs_check_and_init_root_item(struct btrfs_root_item *item); 3496 void btrfs_update_root_times(struct btrfs_trans_handle *trans, 3497 struct btrfs_root *root); 3498 3499 /* uuid-tree.c */ 3500 int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans, 3501 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 3502 u64 subid); 3503 int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans, 3504 struct btrfs_root *uuid_root, u8 *uuid, u8 type, 3505 u64 subid); 3506 int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info, 3507 int (*check_func)(struct btrfs_fs_info *, u8 *, u8, 3508 u64)); 3509 3510 /* dir-item.c */ 3511 int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir, 3512 const char *name, int name_len); 3513 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, 3514 struct btrfs_root *root, const char *name, 3515 int name_len, struct inode *dir, 3516 struct btrfs_key *location, u8 type, u64 index); 3517 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, 3518 struct btrfs_root *root, 3519 struct btrfs_path *path, u64 dir, 3520 const char *name, int name_len, 3521 int mod); 3522 struct btrfs_dir_item * 3523 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans, 3524 struct btrfs_root *root, 3525 struct btrfs_path *path, u64 dir, 3526 u64 objectid, const char *name, int name_len, 3527 int mod); 3528 struct btrfs_dir_item * 3529 btrfs_search_dir_index_item(struct btrfs_root *root, 3530 struct btrfs_path *path, u64 dirid, 3531 const char *name, int name_len); 3532 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans, 3533 struct btrfs_root *root, 3534 struct btrfs_path *path, 3535 struct btrfs_dir_item *di); 3536 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans, 3537 struct btrfs_root *root, 3538 struct btrfs_path *path, u64 objectid, 3539 const char *name, u16 name_len, 3540 const void *data, u16 data_len); 3541 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans, 3542 struct btrfs_root *root, 3543 struct btrfs_path *path, u64 dir, 3544 const char *name, u16 name_len, 3545 int mod); 3546 int verify_dir_item(struct btrfs_root *root, 3547 struct extent_buffer *leaf, 3548 struct btrfs_dir_item *dir_item); 3549 3550 /* orphan.c */ 3551 int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans, 3552 struct btrfs_root *root, u64 offset); 3553 int btrfs_del_orphan_item(struct btrfs_trans_handle *trans, 3554 struct btrfs_root *root, u64 offset); 3555 int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset); 3556 3557 /* inode-item.c */ 3558 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, 3559 struct btrfs_root *root, 3560 const char *name, int name_len, 3561 u64 inode_objectid, u64 ref_objectid, u64 index); 3562 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, 3563 struct btrfs_root *root, 3564 const char *name, int name_len, 3565 u64 inode_objectid, u64 ref_objectid, u64 *index); 3566 int btrfs_get_inode_ref_index(struct btrfs_trans_handle *trans, 3567 struct btrfs_root *root, 3568 struct btrfs_path *path, 3569 const char *name, int name_len, 3570 u64 inode_objectid, u64 ref_objectid, int mod, 3571 u64 *ret_index); 3572 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 3573 struct btrfs_root *root, 3574 struct btrfs_path *path, u64 objectid); 3575 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root 3576 *root, struct btrfs_path *path, 3577 struct btrfs_key *location, int mod); 3578 3579 struct btrfs_inode_extref * 3580 btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans, 3581 struct btrfs_root *root, 3582 struct btrfs_path *path, 3583 const char *name, int name_len, 3584 u64 inode_objectid, u64 ref_objectid, int ins_len, 3585 int cow); 3586 3587 int btrfs_find_name_in_ext_backref(struct btrfs_path *path, 3588 u64 ref_objectid, const char *name, 3589 int name_len, 3590 struct btrfs_inode_extref **extref_ret); 3591 3592 /* file-item.c */ 3593 struct btrfs_dio_private; 3594 int btrfs_del_csums(struct btrfs_trans_handle *trans, 3595 struct btrfs_root *root, u64 bytenr, u64 len); 3596 int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, 3597 struct bio *bio, u32 *dst); 3598 int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, 3599 struct btrfs_dio_private *dip, struct bio *bio, 3600 u64 logical_offset); 3601 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, 3602 struct btrfs_root *root, 3603 u64 objectid, u64 pos, 3604 u64 disk_offset, u64 disk_num_bytes, 3605 u64 num_bytes, u64 offset, u64 ram_bytes, 3606 u8 compression, u8 encryption, u16 other_encoding); 3607 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, 3608 struct btrfs_root *root, 3609 struct btrfs_path *path, u64 objectid, 3610 u64 bytenr, int mod); 3611 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 3612 struct btrfs_root *root, 3613 struct btrfs_ordered_sum *sums); 3614 int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, 3615 struct bio *bio, u64 file_start, int contig); 3616 int btrfs_csum_truncate(struct btrfs_trans_handle *trans, 3617 struct btrfs_root *root, struct btrfs_path *path, 3618 u64 isize); 3619 int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 3620 struct list_head *list, int search_commit); 3621 /* inode.c */ 3622 struct btrfs_delalloc_work { 3623 struct inode *inode; 3624 int wait; 3625 int delay_iput; 3626 struct completion completion; 3627 struct list_head list; 3628 struct btrfs_work work; 3629 }; 3630 3631 struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, 3632 int wait, int delay_iput); 3633 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work); 3634 3635 struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, 3636 size_t pg_offset, u64 start, u64 len, 3637 int create); 3638 noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len, 3639 u64 *orig_start, u64 *orig_block_len, 3640 u64 *ram_bytes); 3641 3642 /* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */ 3643 #if defined(ClearPageFsMisc) && !defined(ClearPageChecked) 3644 #define ClearPageChecked ClearPageFsMisc 3645 #define SetPageChecked SetPageFsMisc 3646 #define PageChecked PageFsMisc 3647 #endif 3648 3649 /* This forces readahead on a given range of bytes in an inode */ 3650 static inline void btrfs_force_ra(struct address_space *mapping, 3651 struct file_ra_state *ra, struct file *file, 3652 pgoff_t offset, unsigned long req_size) 3653 { 3654 page_cache_sync_readahead(mapping, ra, file, offset, req_size); 3655 } 3656 3657 struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry); 3658 int btrfs_set_inode_index(struct inode *dir, u64 *index); 3659 int btrfs_unlink_inode(struct btrfs_trans_handle *trans, 3660 struct btrfs_root *root, 3661 struct inode *dir, struct inode *inode, 3662 const char *name, int name_len); 3663 int btrfs_add_link(struct btrfs_trans_handle *trans, 3664 struct inode *parent_inode, struct inode *inode, 3665 const char *name, int name_len, int add_backref, u64 index); 3666 int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, 3667 struct btrfs_root *root, 3668 struct inode *dir, u64 objectid, 3669 const char *name, int name_len); 3670 int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, 3671 int front); 3672 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 3673 struct btrfs_root *root, 3674 struct inode *inode, u64 new_size, 3675 u32 min_type); 3676 3677 int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput); 3678 int btrfs_start_all_delalloc_inodes(struct btrfs_fs_info *fs_info, 3679 int delay_iput); 3680 int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, 3681 struct extent_state **cached_state); 3682 int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, 3683 struct btrfs_root *new_root, u64 new_dirid); 3684 int btrfs_merge_bio_hook(int rw, struct page *page, unsigned long offset, 3685 size_t size, struct bio *bio, 3686 unsigned long bio_flags); 3687 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf); 3688 int btrfs_readpage(struct file *file, struct page *page); 3689 void btrfs_evict_inode(struct inode *inode); 3690 int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc); 3691 struct inode *btrfs_alloc_inode(struct super_block *sb); 3692 void btrfs_destroy_inode(struct inode *inode); 3693 int btrfs_drop_inode(struct inode *inode); 3694 int btrfs_init_cachep(void); 3695 void btrfs_destroy_cachep(void); 3696 long btrfs_ioctl_trans_end(struct file *file); 3697 struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, 3698 struct btrfs_root *root, int *was_new); 3699 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, 3700 size_t pg_offset, u64 start, u64 end, 3701 int create); 3702 int btrfs_update_inode(struct btrfs_trans_handle *trans, 3703 struct btrfs_root *root, 3704 struct inode *inode); 3705 int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, 3706 struct btrfs_root *root, struct inode *inode); 3707 int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode); 3708 int btrfs_orphan_cleanup(struct btrfs_root *root); 3709 void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, 3710 struct btrfs_root *root); 3711 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size); 3712 void btrfs_invalidate_inodes(struct btrfs_root *root); 3713 void btrfs_add_delayed_iput(struct inode *inode); 3714 void btrfs_run_delayed_iputs(struct btrfs_root *root); 3715 int btrfs_prealloc_file_range(struct inode *inode, int mode, 3716 u64 start, u64 num_bytes, u64 min_size, 3717 loff_t actual_len, u64 *alloc_hint); 3718 int btrfs_prealloc_file_range_trans(struct inode *inode, 3719 struct btrfs_trans_handle *trans, int mode, 3720 u64 start, u64 num_bytes, u64 min_size, 3721 loff_t actual_len, u64 *alloc_hint); 3722 extern const struct dentry_operations btrfs_dentry_operations; 3723 3724 /* ioctl.c */ 3725 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 3726 void btrfs_update_iflags(struct inode *inode); 3727 void btrfs_inherit_iflags(struct inode *inode, struct inode *dir); 3728 int btrfs_is_empty_uuid(u8 *uuid); 3729 int btrfs_defrag_file(struct inode *inode, struct file *file, 3730 struct btrfs_ioctl_defrag_range_args *range, 3731 u64 newer_than, unsigned long max_pages); 3732 void btrfs_get_block_group_info(struct list_head *groups_list, 3733 struct btrfs_ioctl_space_info *space); 3734 void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock, 3735 struct btrfs_ioctl_balance_args *bargs); 3736 3737 3738 /* file.c */ 3739 int btrfs_auto_defrag_init(void); 3740 void btrfs_auto_defrag_exit(void); 3741 int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, 3742 struct inode *inode); 3743 int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info); 3744 void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info); 3745 int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync); 3746 void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end, 3747 int skip_pinned); 3748 int btrfs_replace_extent_cache(struct inode *inode, struct extent_map *replace, 3749 u64 start, u64 end, int skip_pinned, 3750 int modified); 3751 extern const struct file_operations btrfs_file_operations; 3752 int __btrfs_drop_extents(struct btrfs_trans_handle *trans, 3753 struct btrfs_root *root, struct inode *inode, 3754 struct btrfs_path *path, u64 start, u64 end, 3755 u64 *drop_end, int drop_cache); 3756 int btrfs_drop_extents(struct btrfs_trans_handle *trans, 3757 struct btrfs_root *root, struct inode *inode, u64 start, 3758 u64 end, int drop_cache); 3759 int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 3760 struct inode *inode, u64 start, u64 end); 3761 int btrfs_release_file(struct inode *inode, struct file *file); 3762 int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, 3763 struct page **pages, size_t num_pages, 3764 loff_t pos, size_t write_bytes, 3765 struct extent_state **cached); 3766 3767 /* tree-defrag.c */ 3768 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, 3769 struct btrfs_root *root); 3770 3771 /* sysfs.c */ 3772 int btrfs_init_sysfs(void); 3773 void btrfs_exit_sysfs(void); 3774 3775 /* xattr.c */ 3776 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); 3777 3778 /* super.c */ 3779 int btrfs_parse_options(struct btrfs_root *root, char *options); 3780 int btrfs_sync_fs(struct super_block *sb, int wait); 3781 3782 #ifdef CONFIG_PRINTK 3783 __printf(2, 3) 3784 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...); 3785 #else 3786 static inline __printf(2, 3) 3787 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...) 3788 { 3789 } 3790 #endif 3791 3792 #define btrfs_emerg(fs_info, fmt, args...) \ 3793 btrfs_printk(fs_info, KERN_EMERG fmt, ##args) 3794 #define btrfs_alert(fs_info, fmt, args...) \ 3795 btrfs_printk(fs_info, KERN_ALERT fmt, ##args) 3796 #define btrfs_crit(fs_info, fmt, args...) \ 3797 btrfs_printk(fs_info, KERN_CRIT fmt, ##args) 3798 #define btrfs_err(fs_info, fmt, args...) \ 3799 btrfs_printk(fs_info, KERN_ERR fmt, ##args) 3800 #define btrfs_warn(fs_info, fmt, args...) \ 3801 btrfs_printk(fs_info, KERN_WARNING fmt, ##args) 3802 #define btrfs_notice(fs_info, fmt, args...) \ 3803 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args) 3804 #define btrfs_info(fs_info, fmt, args...) \ 3805 btrfs_printk(fs_info, KERN_INFO fmt, ##args) 3806 #define btrfs_debug(fs_info, fmt, args...) \ 3807 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args) 3808 3809 #ifdef CONFIG_BTRFS_ASSERT 3810 3811 static inline void assfail(char *expr, char *file, int line) 3812 { 3813 printk(KERN_ERR "BTRFS assertion failed: %s, file: %s, line: %d", 3814 expr, file, line); 3815 BUG(); 3816 } 3817 3818 #define ASSERT(expr) \ 3819 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__)) 3820 #else 3821 #define ASSERT(expr) ((void)0) 3822 #endif 3823 3824 #define btrfs_assert() 3825 __printf(5, 6) 3826 void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function, 3827 unsigned int line, int errno, const char *fmt, ...); 3828 3829 3830 void __btrfs_abort_transaction(struct btrfs_trans_handle *trans, 3831 struct btrfs_root *root, const char *function, 3832 unsigned int line, int errno); 3833 3834 #define btrfs_set_fs_incompat(__fs_info, opt) \ 3835 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3836 3837 static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, 3838 u64 flag) 3839 { 3840 struct btrfs_super_block *disk_super; 3841 u64 features; 3842 3843 disk_super = fs_info->super_copy; 3844 features = btrfs_super_incompat_flags(disk_super); 3845 if (!(features & flag)) { 3846 spin_lock(&fs_info->super_lock); 3847 features = btrfs_super_incompat_flags(disk_super); 3848 if (!(features & flag)) { 3849 features |= flag; 3850 btrfs_set_super_incompat_flags(disk_super, features); 3851 printk(KERN_INFO "btrfs: setting %llu feature flag\n", 3852 flag); 3853 } 3854 spin_unlock(&fs_info->super_lock); 3855 } 3856 } 3857 3858 #define btrfs_fs_incompat(fs_info, opt) \ 3859 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt) 3860 3861 static inline int __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag) 3862 { 3863 struct btrfs_super_block *disk_super; 3864 disk_super = fs_info->super_copy; 3865 return !!(btrfs_super_incompat_flags(disk_super) & flag); 3866 } 3867 3868 /* 3869 * Call btrfs_abort_transaction as early as possible when an error condition is 3870 * detected, that way the exact line number is reported. 3871 */ 3872 3873 #define btrfs_abort_transaction(trans, root, errno) \ 3874 do { \ 3875 __btrfs_abort_transaction(trans, root, __func__, \ 3876 __LINE__, errno); \ 3877 } while (0) 3878 3879 #define btrfs_std_error(fs_info, errno) \ 3880 do { \ 3881 if ((errno)) \ 3882 __btrfs_std_error((fs_info), __func__, \ 3883 __LINE__, (errno), NULL); \ 3884 } while (0) 3885 3886 #define btrfs_error(fs_info, errno, fmt, args...) \ 3887 do { \ 3888 __btrfs_std_error((fs_info), __func__, __LINE__, \ 3889 (errno), fmt, ##args); \ 3890 } while (0) 3891 3892 __printf(5, 6) 3893 void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function, 3894 unsigned int line, int errno, const char *fmt, ...); 3895 3896 /* 3897 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic 3898 * will panic(). Otherwise we BUG() here. 3899 */ 3900 #define btrfs_panic(fs_info, errno, fmt, args...) \ 3901 do { \ 3902 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \ 3903 BUG(); \ 3904 } while (0) 3905 3906 /* acl.c */ 3907 #ifdef CONFIG_BTRFS_FS_POSIX_ACL 3908 struct posix_acl *btrfs_get_acl(struct inode *inode, int type); 3909 int btrfs_init_acl(struct btrfs_trans_handle *trans, 3910 struct inode *inode, struct inode *dir); 3911 int btrfs_acl_chmod(struct inode *inode); 3912 #else 3913 #define btrfs_get_acl NULL 3914 static inline int btrfs_init_acl(struct btrfs_trans_handle *trans, 3915 struct inode *inode, struct inode *dir) 3916 { 3917 return 0; 3918 } 3919 static inline int btrfs_acl_chmod(struct inode *inode) 3920 { 3921 return 0; 3922 } 3923 #endif 3924 3925 /* relocation.c */ 3926 int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start); 3927 int btrfs_init_reloc_root(struct btrfs_trans_handle *trans, 3928 struct btrfs_root *root); 3929 int btrfs_update_reloc_root(struct btrfs_trans_handle *trans, 3930 struct btrfs_root *root); 3931 int btrfs_recover_relocation(struct btrfs_root *root); 3932 int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len); 3933 int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans, 3934 struct btrfs_root *root, struct extent_buffer *buf, 3935 struct extent_buffer *cow); 3936 void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans, 3937 struct btrfs_pending_snapshot *pending, 3938 u64 *bytes_to_reserve); 3939 int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans, 3940 struct btrfs_pending_snapshot *pending); 3941 3942 /* scrub.c */ 3943 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, 3944 u64 end, struct btrfs_scrub_progress *progress, 3945 int readonly, int is_dev_replace); 3946 void btrfs_scrub_pause(struct btrfs_root *root); 3947 void btrfs_scrub_pause_super(struct btrfs_root *root); 3948 void btrfs_scrub_continue(struct btrfs_root *root); 3949 void btrfs_scrub_continue_super(struct btrfs_root *root); 3950 int btrfs_scrub_cancel(struct btrfs_fs_info *info); 3951 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info, 3952 struct btrfs_device *dev); 3953 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid, 3954 struct btrfs_scrub_progress *progress); 3955 3956 /* reada.c */ 3957 struct reada_control { 3958 struct btrfs_root *root; /* tree to prefetch */ 3959 struct btrfs_key key_start; 3960 struct btrfs_key key_end; /* exclusive */ 3961 atomic_t elems; 3962 struct kref refcnt; 3963 wait_queue_head_t wait; 3964 }; 3965 struct reada_control *btrfs_reada_add(struct btrfs_root *root, 3966 struct btrfs_key *start, struct btrfs_key *end); 3967 int btrfs_reada_wait(void *handle); 3968 void btrfs_reada_detach(void *handle); 3969 int btree_readahead_hook(struct btrfs_root *root, struct extent_buffer *eb, 3970 u64 start, int err); 3971 3972 /* qgroup.c */ 3973 struct qgroup_update { 3974 struct list_head list; 3975 struct btrfs_delayed_ref_node *node; 3976 struct btrfs_delayed_extent_op *extent_op; 3977 }; 3978 3979 int btrfs_quota_enable(struct btrfs_trans_handle *trans, 3980 struct btrfs_fs_info *fs_info); 3981 int btrfs_quota_disable(struct btrfs_trans_handle *trans, 3982 struct btrfs_fs_info *fs_info); 3983 int btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info); 3984 void btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info); 3985 int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info); 3986 int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, 3987 struct btrfs_fs_info *fs_info, u64 src, u64 dst); 3988 int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, 3989 struct btrfs_fs_info *fs_info, u64 src, u64 dst); 3990 int btrfs_create_qgroup(struct btrfs_trans_handle *trans, 3991 struct btrfs_fs_info *fs_info, u64 qgroupid, 3992 char *name); 3993 int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, 3994 struct btrfs_fs_info *fs_info, u64 qgroupid); 3995 int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, 3996 struct btrfs_fs_info *fs_info, u64 qgroupid, 3997 struct btrfs_qgroup_limit *limit); 3998 int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info); 3999 void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info); 4000 struct btrfs_delayed_extent_op; 4001 int btrfs_qgroup_record_ref(struct btrfs_trans_handle *trans, 4002 struct btrfs_delayed_ref_node *node, 4003 struct btrfs_delayed_extent_op *extent_op); 4004 int btrfs_qgroup_account_ref(struct btrfs_trans_handle *trans, 4005 struct btrfs_fs_info *fs_info, 4006 struct btrfs_delayed_ref_node *node, 4007 struct btrfs_delayed_extent_op *extent_op); 4008 int btrfs_run_qgroups(struct btrfs_trans_handle *trans, 4009 struct btrfs_fs_info *fs_info); 4010 int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, 4011 struct btrfs_fs_info *fs_info, u64 srcid, u64 objectid, 4012 struct btrfs_qgroup_inherit *inherit); 4013 int btrfs_qgroup_reserve(struct btrfs_root *root, u64 num_bytes); 4014 void btrfs_qgroup_free(struct btrfs_root *root, u64 num_bytes); 4015 4016 void assert_qgroups_uptodate(struct btrfs_trans_handle *trans); 4017 4018 static inline int is_fstree(u64 rootid) 4019 { 4020 if (rootid == BTRFS_FS_TREE_OBJECTID || 4021 (s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID) 4022 return 1; 4023 return 0; 4024 } 4025 4026 static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info) 4027 { 4028 return signal_pending(current); 4029 } 4030 4031 4032 #endif 4033