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1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19#ifndef __BTRFS_CTREE__
20#define __BTRFS_CTREE__
21
22#include <linux/version.h>
23#include <linux/mm.h>
24#include <linux/highmem.h>
25#include <linux/fs.h>
26#include <linux/completion.h>
27#include <linux/backing-dev.h>
28#include <linux/wait.h>
29#include <asm/kmap_types.h>
30#include "extent_io.h"
31#include "extent_map.h"
32#include "async-thread.h"
33
34struct btrfs_trans_handle;
35struct btrfs_transaction;
36extern struct kmem_cache *btrfs_trans_handle_cachep;
37extern struct kmem_cache *btrfs_transaction_cachep;
38extern struct kmem_cache *btrfs_bit_radix_cachep;
39extern struct kmem_cache *btrfs_path_cachep;
40struct btrfs_ordered_sum;
41
42#define BTRFS_MAGIC "_BFRfS_M"
43
44#define BTRFS_ACL_NOT_CACHED ((void *)-1)
45
46#ifdef CONFIG_LOCKDEP
47# define BTRFS_MAX_LEVEL 7
48#else
49# define BTRFS_MAX_LEVEL 8
50#endif
51
52/* holds pointers to all of the tree roots */
53#define BTRFS_ROOT_TREE_OBJECTID 1ULL
54
55/* stores information about which extents are in use, and reference counts */
56#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
57
58/*
59 * chunk tree stores translations from logical -> physical block numbering
60 * the super block points to the chunk tree
61 */
62#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
63
64/*
65 * stores information about which areas of a given device are in use.
66 * one per device. The tree of tree roots points to the device tree
67 */
68#define BTRFS_DEV_TREE_OBJECTID 4ULL
69
70/* one per subvolume, storing files and directories */
71#define BTRFS_FS_TREE_OBJECTID 5ULL
72
73/* directory objectid inside the root tree */
74#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
75
76/* orhpan objectid for tracking unlinked/truncated files */
77#define BTRFS_ORPHAN_OBJECTID -5ULL
78
79/* does write ahead logging to speed up fsyncs */
80#define BTRFS_TREE_LOG_OBJECTID -6ULL
81#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
82
83/* for space balancing */
84#define BTRFS_TREE_RELOC_OBJECTID -8ULL
85#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
86
87/* dummy objectid represents multiple objectids */
88#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
89
90/*
91 * All files have objectids in this range.
92 */
93#define BTRFS_FIRST_FREE_OBJECTID 256ULL
94#define BTRFS_LAST_FREE_OBJECTID -256ULL
95#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
96
97
98/*
99 * the device items go into the chunk tree. The key is in the form
100 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
101 */
102#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
103
104/*
105 * we can actually store much bigger names, but lets not confuse the rest
106 * of linux
107 */
108#define BTRFS_NAME_LEN 255
109
110/* 32 bytes in various csum fields */
111#define BTRFS_CSUM_SIZE 32
112/* four bytes for CRC32 */
113#define BTRFS_CRC32_SIZE 4
114#define BTRFS_EMPTY_DIR_SIZE 0
115
116#define BTRFS_FT_UNKNOWN 0
117#define BTRFS_FT_REG_FILE 1
118#define BTRFS_FT_DIR 2
119#define BTRFS_FT_CHRDEV 3
120#define BTRFS_FT_BLKDEV 4
121#define BTRFS_FT_FIFO 5
122#define BTRFS_FT_SOCK 6
123#define BTRFS_FT_SYMLINK 7
124#define BTRFS_FT_XATTR 8
125#define BTRFS_FT_MAX 9
126
127/*
128 * the key defines the order in the tree, and so it also defines (optimal)
129 * block layout. objectid corresonds to the inode number. The flags
130 * tells us things about the object, and is a kind of stream selector.
131 * so for a given inode, keys with flags of 1 might refer to the inode
132 * data, flags of 2 may point to file data in the btree and flags == 3
133 * may point to extents.
134 *
135 * offset is the starting byte offset for this key in the stream.
136 *
137 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
138 * in cpu native order. Otherwise they are identical and their sizes
139 * should be the same (ie both packed)
140 */
141struct btrfs_disk_key {
142 __le64 objectid;
143 u8 type;
144 __le64 offset;
145} __attribute__ ((__packed__));
146
147struct btrfs_key {
148 u64 objectid;
149 u8 type;
150 u64 offset;
151} __attribute__ ((__packed__));
152
153struct btrfs_mapping_tree {
154 struct extent_map_tree map_tree;
155};
156
157#define BTRFS_UUID_SIZE 16
158struct btrfs_dev_item {
159 /* the internal btrfs device id */
160 __le64 devid;
161
162 /* size of the device */
163 __le64 total_bytes;
164
165 /* bytes used */
166 __le64 bytes_used;
167
168 /* optimal io alignment for this device */
169 __le32 io_align;
170
171 /* optimal io width for this device */
172 __le32 io_width;
173
174 /* minimal io size for this device */
175 __le32 sector_size;
176
177 /* type and info about this device */
178 __le64 type;
179
180 /* expected generation for this device */
181 __le64 generation;
182
183 /* grouping information for allocation decisions */
184 __le32 dev_group;
185
186 /* seek speed 0-100 where 100 is fastest */
187 u8 seek_speed;
188
189 /* bandwidth 0-100 where 100 is fastest */
190 u8 bandwidth;
191
192 /* btrfs generated uuid for this device */
193 u8 uuid[BTRFS_UUID_SIZE];
194
195 /* uuid of FS who owns this device */
196 u8 fsid[BTRFS_UUID_SIZE];
197} __attribute__ ((__packed__));
198
199struct btrfs_stripe {
200 __le64 devid;
201 __le64 offset;
202 u8 dev_uuid[BTRFS_UUID_SIZE];
203} __attribute__ ((__packed__));
204
205struct btrfs_chunk {
206 /* size of this chunk in bytes */
207 __le64 length;
208
209 /* objectid of the root referencing this chunk */
210 __le64 owner;
211
212 __le64 stripe_len;
213 __le64 type;
214
215 /* optimal io alignment for this chunk */
216 __le32 io_align;
217
218 /* optimal io width for this chunk */
219 __le32 io_width;
220
221 /* minimal io size for this chunk */
222 __le32 sector_size;
223
224 /* 2^16 stripes is quite a lot, a second limit is the size of a single
225 * item in the btree
226 */
227 __le16 num_stripes;
228
229 /* sub stripes only matter for raid10 */
230 __le16 sub_stripes;
231 struct btrfs_stripe stripe;
232 /* additional stripes go here */
233} __attribute__ ((__packed__));
234
235static inline unsigned long btrfs_chunk_item_size(int num_stripes)
236{
237 BUG_ON(num_stripes == 0);
238 return sizeof(struct btrfs_chunk) +
239 sizeof(struct btrfs_stripe) * (num_stripes - 1);
240}
241
242#define BTRFS_FSID_SIZE 16
243#define BTRFS_HEADER_FLAG_WRITTEN (1 << 0)
244
245/*
246 * every tree block (leaf or node) starts with this header.
247 */
248struct btrfs_header {
249 /* these first four must match the super block */
250 u8 csum[BTRFS_CSUM_SIZE];
251 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
252 __le64 bytenr; /* which block this node is supposed to live in */
253 __le64 flags;
254
255 /* allowed to be different from the super from here on down */
256 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
257 __le64 generation;
258 __le64 owner;
259 __le32 nritems;
260 u8 level;
261} __attribute__ ((__packed__));
262
263#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
264 sizeof(struct btrfs_header)) / \
265 sizeof(struct btrfs_key_ptr))
266#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
267#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
268#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
269 sizeof(struct btrfs_item) - \
270 sizeof(struct btrfs_file_extent_item))
271
272#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
273
274/*
275 * this is a very generous portion of the super block, giving us
276 * room to translate 14 chunks with 3 stripes each.
277 */
278#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
279#define BTRFS_LABEL_SIZE 256
280
281/*
282 * the super block basically lists the main trees of the FS
283 * it currently lacks any block count etc etc
284 */
285struct btrfs_super_block {
286 u8 csum[BTRFS_CSUM_SIZE];
287 /* the first 4 fields must match struct btrfs_header */
288 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
289 __le64 bytenr; /* this block number */
290 __le64 flags;
291
292 /* allowed to be different from the btrfs_header from here own down */
293 __le64 magic;
294 __le64 generation;
295 __le64 root;
296 __le64 chunk_root;
297 __le64 log_root;
298 __le64 total_bytes;
299 __le64 bytes_used;
300 __le64 root_dir_objectid;
301 __le64 num_devices;
302 __le32 sectorsize;
303 __le32 nodesize;
304 __le32 leafsize;
305 __le32 stripesize;
306 __le32 sys_chunk_array_size;
307 __le64 chunk_root_generation;
308 u8 root_level;
309 u8 chunk_root_level;
310 u8 log_root_level;
311 struct btrfs_dev_item dev_item;
312 char label[BTRFS_LABEL_SIZE];
313 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
314} __attribute__ ((__packed__));
315
316/*
317 * A leaf is full of items. offset and size tell us where to find
318 * the item in the leaf (relative to the start of the data area)
319 */
320struct btrfs_item {
321 struct btrfs_disk_key key;
322 __le32 offset;
323 __le32 size;
324} __attribute__ ((__packed__));
325
326/*
327 * leaves have an item area and a data area:
328 * [item0, item1....itemN] [free space] [dataN...data1, data0]
329 *
330 * The data is separate from the items to get the keys closer together
331 * during searches.
332 */
333struct btrfs_leaf {
334 struct btrfs_header header;
335 struct btrfs_item items[];
336} __attribute__ ((__packed__));
337
338/*
339 * all non-leaf blocks are nodes, they hold only keys and pointers to
340 * other blocks
341 */
342struct btrfs_key_ptr {
343 struct btrfs_disk_key key;
344 __le64 blockptr;
345 __le64 generation;
346} __attribute__ ((__packed__));
347
348struct btrfs_node {
349 struct btrfs_header header;
350 struct btrfs_key_ptr ptrs[];
351} __attribute__ ((__packed__));
352
353/*
354 * btrfs_paths remember the path taken from the root down to the leaf.
355 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
356 * to any other levels that are present.
357 *
358 * The slots array records the index of the item or block pointer
359 * used while walking the tree.
360 */
361struct btrfs_path {
362 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
363 int slots[BTRFS_MAX_LEVEL];
364 /* if there is real range locking, this locks field will change */
365 int locks[BTRFS_MAX_LEVEL];
366 int reada;
367 /* keep some upper locks as we walk down */
368 int keep_locks;
369 int skip_locking;
370 int lowest_level;
371};
372
373/*
374 * items in the extent btree are used to record the objectid of the
375 * owner of the block and the number of references
376 */
377struct btrfs_extent_item {
378 __le32 refs;
379} __attribute__ ((__packed__));
380
381struct btrfs_extent_ref {
382 __le64 root;
383 __le64 generation;
384 __le64 objectid;
385 __le32 num_refs;
386} __attribute__ ((__packed__));
387
388/* dev extents record free space on individual devices. The owner
389 * field points back to the chunk allocation mapping tree that allocated
390 * the extent. The chunk tree uuid field is a way to double check the owner
391 */
392struct btrfs_dev_extent {
393 __le64 chunk_tree;
394 __le64 chunk_objectid;
395 __le64 chunk_offset;
396 __le64 length;
397 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
398} __attribute__ ((__packed__));
399
400struct btrfs_inode_ref {
401 __le64 index;
402 __le16 name_len;
403 /* name goes here */
404} __attribute__ ((__packed__));
405
406struct btrfs_timespec {
407 __le64 sec;
408 __le32 nsec;
409} __attribute__ ((__packed__));
410
411typedef enum {
412 BTRFS_COMPRESS_NONE = 0,
413 BTRFS_COMPRESS_ZLIB = 1,
414 BTRFS_COMPRESS_LAST = 2,
415} btrfs_compression_type;
416
417/* we don't understand any encryption methods right now */
418typedef enum {
419 BTRFS_ENCRYPTION_NONE = 0,
420 BTRFS_ENCRYPTION_LAST = 1,
421} btrfs_encryption_type;
422
423struct btrfs_inode_item {
424 /* nfs style generation number */
425 __le64 generation;
426 /* transid that last touched this inode */
427 __le64 transid;
428 __le64 size;
429 __le64 nbytes;
430 __le64 block_group;
431 __le32 nlink;
432 __le32 uid;
433 __le32 gid;
434 __le32 mode;
435 __le64 rdev;
436 __le16 flags;
437 __le16 compat_flags;
438
439 struct btrfs_timespec atime;
440 struct btrfs_timespec ctime;
441 struct btrfs_timespec mtime;
442 struct btrfs_timespec otime;
443} __attribute__ ((__packed__));
444
445struct btrfs_dir_log_item {
446 __le64 end;
447} __attribute__ ((__packed__));
448
449struct btrfs_dir_item {
450 struct btrfs_disk_key location;
451 __le64 transid;
452 __le16 data_len;
453 __le16 name_len;
454 u8 type;
455} __attribute__ ((__packed__));
456
457struct btrfs_root_item {
458 struct btrfs_inode_item inode;
459 __le64 generation;
460 __le64 root_dirid;
461 __le64 bytenr;
462 __le64 byte_limit;
463 __le64 bytes_used;
464 __le64 last_snapshot;
465 __le32 flags;
466 __le32 refs;
467 struct btrfs_disk_key drop_progress;
468 u8 drop_level;
469 u8 level;
470} __attribute__ ((__packed__));
471
472/*
473 * this is used for both forward and backward root refs
474 */
475struct btrfs_root_ref {
476 __le64 dirid;
477 __le64 sequence;
478 __le16 name_len;
479} __attribute__ ((__packed__));
480
481#define BTRFS_FILE_EXTENT_INLINE 0
482#define BTRFS_FILE_EXTENT_REG 1
483#define BTRFS_FILE_EXTENT_PREALLOC 2
484
485struct btrfs_file_extent_item {
486 /*
487 * transaction id that created this extent
488 */
489 __le64 generation;
490 /*
491 * max number of bytes to hold this extent in ram
492 * when we split a compressed extent we can't know how big
493 * each of the resulting pieces will be. So, this is
494 * an upper limit on the size of the extent in ram instead of
495 * an exact limit.
496 */
497 __le64 ram_bytes;
498
499 /*
500 * 32 bits for the various ways we might encode the data,
501 * including compression and encryption. If any of these
502 * are set to something a given disk format doesn't understand
503 * it is treated like an incompat flag for reading and writing,
504 * but not for stat.
505 */
506 u8 compression;
507 u8 encryption;
508 __le16 other_encoding; /* spare for later use */
509
510 /* are we inline data or a real extent? */
511 u8 type;
512
513 /*
514 * disk space consumed by the extent, checksum blocks are included
515 * in these numbers
516 */
517 __le64 disk_bytenr;
518 __le64 disk_num_bytes;
519 /*
520 * the logical offset in file blocks (no csums)
521 * this extent record is for. This allows a file extent to point
522 * into the middle of an existing extent on disk, sharing it
523 * between two snapshots (useful if some bytes in the middle of the
524 * extent have changed
525 */
526 __le64 offset;
527 /*
528 * the logical number of file blocks (no csums included). This
529 * always reflects the size uncompressed and without encoding.
530 */
531 __le64 num_bytes;
532
533} __attribute__ ((__packed__));
534
535struct btrfs_csum_item {
536 u8 csum;
537} __attribute__ ((__packed__));
538
539/* different types of block groups (and chunks) */
540#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
541#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
542#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
543#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
544#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
545#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
546#define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
547
548struct btrfs_block_group_item {
549 __le64 used;
550 __le64 chunk_objectid;
551 __le64 flags;
552} __attribute__ ((__packed__));
553
554struct btrfs_space_info {
555 u64 flags;
556 u64 total_bytes;
557 u64 bytes_used;
558 u64 bytes_pinned;
559 u64 bytes_reserved;
560 u64 bytes_readonly;
561 int full;
562 int force_alloc;
563 struct list_head list;
564
565 /* for block groups in our same type */
566 struct list_head block_groups;
567 spinlock_t lock;
568 struct rw_semaphore groups_sem;
569};
570
571struct btrfs_free_space {
572 struct rb_node bytes_index;
573 struct rb_node offset_index;
574 u64 offset;
575 u64 bytes;
576};
577
578struct btrfs_block_group_cache {
579 struct btrfs_key key;
580 struct btrfs_block_group_item item;
581 spinlock_t lock;
582 struct mutex alloc_mutex;
583 u64 pinned;
584 u64 reserved;
585 u64 flags;
586 int cached;
587 int ro;
588 int dirty;
589
590 struct btrfs_space_info *space_info;
591
592 /* free space cache stuff */
593 struct rb_root free_space_bytes;
594 struct rb_root free_space_offset;
595
596 /* block group cache stuff */
597 struct rb_node cache_node;
598
599 /* for block groups in the same raid type */
600 struct list_head list;
601};
602
603struct btrfs_leaf_ref_tree {
604 struct rb_root root;
605 struct list_head list;
606 spinlock_t lock;
607};
608
609struct btrfs_device;
610struct btrfs_fs_devices;
611struct btrfs_fs_info {
612 u8 fsid[BTRFS_FSID_SIZE];
613 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
614 struct btrfs_root *extent_root;
615 struct btrfs_root *tree_root;
616 struct btrfs_root *chunk_root;
617 struct btrfs_root *dev_root;
618 struct btrfs_root *fs_root;
619
620 /* the log root tree is a directory of all the other log roots */
621 struct btrfs_root *log_root_tree;
622 struct radix_tree_root fs_roots_radix;
623
624 /* block group cache stuff */
625 spinlock_t block_group_cache_lock;
626 struct rb_root block_group_cache_tree;
627
628 struct extent_io_tree pinned_extents;
629 struct extent_io_tree pending_del;
630 struct extent_io_tree extent_ins;
631
632 /* logical->physical extent mapping */
633 struct btrfs_mapping_tree mapping_tree;
634
635 u64 generation;
636 u64 last_trans_committed;
637 u64 last_trans_new_blockgroup;
638 u64 open_ioctl_trans;
639 unsigned long mount_opt;
640 u64 max_extent;
641 u64 max_inline;
642 u64 alloc_start;
643 struct btrfs_transaction *running_transaction;
644 wait_queue_head_t transaction_throttle;
645 wait_queue_head_t transaction_wait;
646
647 wait_queue_head_t async_submit_wait;
648 wait_queue_head_t tree_log_wait;
649
650 struct btrfs_super_block super_copy;
651 struct btrfs_super_block super_for_commit;
652 struct block_device *__bdev;
653 struct super_block *sb;
654 struct inode *btree_inode;
655 struct backing_dev_info bdi;
656 spinlock_t hash_lock;
657 struct mutex trans_mutex;
658 struct mutex tree_log_mutex;
659 struct mutex transaction_kthread_mutex;
660 struct mutex cleaner_mutex;
661 struct mutex extent_ins_mutex;
662 struct mutex pinned_mutex;
663 struct mutex chunk_mutex;
664 struct mutex drop_mutex;
665 struct mutex volume_mutex;
666 struct mutex tree_reloc_mutex;
667 struct list_head trans_list;
668 struct list_head hashers;
669 struct list_head dead_roots;
670
671 atomic_t nr_async_submits;
672 atomic_t async_submit_draining;
673 atomic_t nr_async_bios;
674 atomic_t async_delalloc_pages;
675 atomic_t tree_log_writers;
676 atomic_t tree_log_commit;
677 unsigned long tree_log_batch;
678 u64 tree_log_transid;
679
680 /*
681 * this is used by the balancing code to wait for all the pending
682 * ordered extents
683 */
684 spinlock_t ordered_extent_lock;
685 struct list_head ordered_extents;
686 struct list_head delalloc_inodes;
687
688 /*
689 * there is a pool of worker threads for checksumming during writes
690 * and a pool for checksumming after reads. This is because readers
691 * can run with FS locks held, and the writers may be waiting for
692 * those locks. We don't want ordering in the pending list to cause
693 * deadlocks, and so the two are serviced separately.
694 *
695 * A third pool does submit_bio to avoid deadlocking with the other
696 * two
697 */
698 struct btrfs_workers workers;
699 struct btrfs_workers delalloc_workers;
700 struct btrfs_workers endio_workers;
701 struct btrfs_workers endio_write_workers;
702 struct btrfs_workers submit_workers;
703 /*
704 * fixup workers take dirty pages that didn't properly go through
705 * the cow mechanism and make them safe to write. It happens
706 * for the sys_munmap function call path
707 */
708 struct btrfs_workers fixup_workers;
709 struct task_struct *transaction_kthread;
710 struct task_struct *cleaner_kthread;
711 int thread_pool_size;
712
713 /* tree relocation relocated fields */
714 struct list_head dead_reloc_roots;
715 struct btrfs_leaf_ref_tree reloc_ref_tree;
716 struct btrfs_leaf_ref_tree shared_ref_tree;
717
718 struct kobject super_kobj;
719 struct completion kobj_unregister;
720 int do_barriers;
721 int closing;
722 int log_root_recovering;
723 atomic_t throttles;
724 atomic_t throttle_gen;
725
726 u64 total_pinned;
727 struct list_head dirty_cowonly_roots;
728
729 struct btrfs_fs_devices *fs_devices;
730 struct list_head space_info;
731 spinlock_t delalloc_lock;
732 spinlock_t new_trans_lock;
733 u64 delalloc_bytes;
734 u64 last_alloc;
735 u64 last_data_alloc;
736
737 spinlock_t ref_cache_lock;
738 u64 total_ref_cache_size;
739
740 u64 avail_data_alloc_bits;
741 u64 avail_metadata_alloc_bits;
742 u64 avail_system_alloc_bits;
743 u64 data_alloc_profile;
744 u64 metadata_alloc_profile;
745 u64 system_alloc_profile;
746
747 void *bdev_holder;
748};
749
750/*
751 * in ram representation of the tree. extent_root is used for all allocations
752 * and for the extent tree extent_root root.
753 */
754struct btrfs_dirty_root;
755struct btrfs_root {
756 struct extent_buffer *node;
757
758 /* the node lock is held while changing the node pointer */
759 spinlock_t node_lock;
760
761 struct extent_buffer *commit_root;
762 struct btrfs_leaf_ref_tree *ref_tree;
763 struct btrfs_leaf_ref_tree ref_tree_struct;
764 struct btrfs_dirty_root *dirty_root;
765 struct btrfs_root *log_root;
766 struct btrfs_root *reloc_root;
767
768 struct btrfs_root_item root_item;
769 struct btrfs_key root_key;
770 struct btrfs_fs_info *fs_info;
771 struct extent_io_tree dirty_log_pages;
772
773 struct kobject root_kobj;
774 struct completion kobj_unregister;
775 struct mutex objectid_mutex;
776 struct mutex log_mutex;
777
778 u64 objectid;
779 u64 last_trans;
780
781 /* data allocations are done in sectorsize units */
782 u32 sectorsize;
783
784 /* node allocations are done in nodesize units */
785 u32 nodesize;
786
787 /* leaf allocations are done in leafsize units */
788 u32 leafsize;
789
790 u32 stripesize;
791
792 u32 type;
793 u64 highest_inode;
794 u64 last_inode_alloc;
795 int ref_cows;
796 int track_dirty;
797 u64 defrag_trans_start;
798 struct btrfs_key defrag_progress;
799 struct btrfs_key defrag_max;
800 int defrag_running;
801 int defrag_level;
802 char *name;
803 int in_sysfs;
804
805 /* the dirty list is only used by non-reference counted roots */
806 struct list_head dirty_list;
807
808 spinlock_t list_lock;
809 struct list_head dead_list;
810 struct list_head orphan_list;
811
812 /*
813 * right now this just gets used so that a root has its own devid
814 * for stat. It may be used for more later
815 */
816 struct super_block anon_super;
817};
818
819/*
820
821 * inode items have the data typically returned from stat and store other
822 * info about object characteristics. There is one for every file and dir in
823 * the FS
824 */
825#define BTRFS_INODE_ITEM_KEY 1
826#define BTRFS_INODE_REF_KEY 12
827#define BTRFS_XATTR_ITEM_KEY 24
828#define BTRFS_ORPHAN_ITEM_KEY 48
829/* reserve 2-15 close to the inode for later flexibility */
830
831/*
832 * dir items are the name -> inode pointers in a directory. There is one
833 * for every name in a directory.
834 */
835#define BTRFS_DIR_LOG_ITEM_KEY 60
836#define BTRFS_DIR_LOG_INDEX_KEY 72
837#define BTRFS_DIR_ITEM_KEY 84
838#define BTRFS_DIR_INDEX_KEY 96
839/*
840 * extent data is for file data
841 */
842#define BTRFS_EXTENT_DATA_KEY 108
843/*
844 * csum items have the checksums for data in the extents
845 */
846#define BTRFS_CSUM_ITEM_KEY 120
847
848
849/* reserve 21-31 for other file/dir stuff */
850
851/*
852 * root items point to tree roots. There are typically in the root
853 * tree used by the super block to find all the other trees
854 */
855#define BTRFS_ROOT_ITEM_KEY 132
856
857/*
858 * root backrefs tie subvols and snapshots to the directory entries that
859 * reference them
860 */
861#define BTRFS_ROOT_BACKREF_KEY 144
862
863/*
864 * root refs make a fast index for listing all of the snapshots and
865 * subvolumes referenced by a given root. They point directly to the
866 * directory item in the root that references the subvol
867 */
868#define BTRFS_ROOT_REF_KEY 156
869
870/*
871 * extent items are in the extent map tree. These record which blocks
872 * are used, and how many references there are to each block
873 */
874#define BTRFS_EXTENT_ITEM_KEY 168
875#define BTRFS_EXTENT_REF_KEY 180
876
877/*
878 * block groups give us hints into the extent allocation trees. Which
879 * blocks are free etc etc
880 */
881#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
882
883#define BTRFS_DEV_EXTENT_KEY 204
884#define BTRFS_DEV_ITEM_KEY 216
885#define BTRFS_CHUNK_ITEM_KEY 228
886
887/*
888 * string items are for debugging. They just store a short string of
889 * data in the FS
890 */
891#define BTRFS_STRING_ITEM_KEY 253
892
893#define BTRFS_MOUNT_NODATASUM (1 << 0)
894#define BTRFS_MOUNT_NODATACOW (1 << 1)
895#define BTRFS_MOUNT_NOBARRIER (1 << 2)
896#define BTRFS_MOUNT_SSD (1 << 3)
897#define BTRFS_MOUNT_DEGRADED (1 << 4)
898#define BTRFS_MOUNT_COMPRESS (1 << 5)
899
900#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
901#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
902#define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
903 BTRFS_MOUNT_##opt)
904/*
905 * Inode flags
906 */
907#define BTRFS_INODE_NODATASUM (1 << 0)
908#define BTRFS_INODE_NODATACOW (1 << 1)
909#define BTRFS_INODE_READONLY (1 << 2)
910#define BTRFS_INODE_NOCOMPRESS (1 << 3)
911#define BTRFS_INODE_PREALLOC (1 << 4)
912#define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
913 ~BTRFS_INODE_##flag)
914#define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
915 BTRFS_INODE_##flag)
916#define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
917 BTRFS_INODE_##flag)
918/* some macros to generate set/get funcs for the struct fields. This
919 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
920 * one for u8:
921 */
922#define le8_to_cpu(v) (v)
923#define cpu_to_le8(v) (v)
924#define __le8 u8
925
926#define read_eb_member(eb, ptr, type, member, result) ( \
927 read_extent_buffer(eb, (char *)(result), \
928 ((unsigned long)(ptr)) + \
929 offsetof(type, member), \
930 sizeof(((type *)0)->member)))
931
932#define write_eb_member(eb, ptr, type, member, result) ( \
933 write_extent_buffer(eb, (char *)(result), \
934 ((unsigned long)(ptr)) + \
935 offsetof(type, member), \
936 sizeof(((type *)0)->member)))
937
938#ifndef BTRFS_SETGET_FUNCS
939#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
940u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
941void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
942#endif
943
944#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
945static inline u##bits btrfs_##name(struct extent_buffer *eb) \
946{ \
947 type *p = kmap_atomic(eb->first_page, KM_USER0); \
948 u##bits res = le##bits##_to_cpu(p->member); \
949 kunmap_atomic(p, KM_USER0); \
950 return res; \
951} \
952static inline void btrfs_set_##name(struct extent_buffer *eb, \
953 u##bits val) \
954{ \
955 type *p = kmap_atomic(eb->first_page, KM_USER0); \
956 p->member = cpu_to_le##bits(val); \
957 kunmap_atomic(p, KM_USER0); \
958}
959
960#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
961static inline u##bits btrfs_##name(type *s) \
962{ \
963 return le##bits##_to_cpu(s->member); \
964} \
965static inline void btrfs_set_##name(type *s, u##bits val) \
966{ \
967 s->member = cpu_to_le##bits(val); \
968}
969
970BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
971BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
972BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
973BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
974BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
975BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
976BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
977BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
978BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
979BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
980BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
981
982BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
983BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
984 total_bytes, 64);
985BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
986 bytes_used, 64);
987BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
988 io_align, 32);
989BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
990 io_width, 32);
991BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
992 sector_size, 32);
993BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
994BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
995 dev_group, 32);
996BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
997 seek_speed, 8);
998BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
999 bandwidth, 8);
1000BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1001 generation, 64);
1002
1003static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1004{
1005 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1006}
1007
1008static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1009{
1010 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1011}
1012
1013BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1014BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1015BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1016BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1017BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1018BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1019BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1020BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1021BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1022BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1023BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1024
1025static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1026{
1027 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1028}
1029
1030BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1031BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1032BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1033 stripe_len, 64);
1034BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1035 io_align, 32);
1036BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1037 io_width, 32);
1038BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1039 sector_size, 32);
1040BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1041BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1042 num_stripes, 16);
1043BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1044 sub_stripes, 16);
1045BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1046BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1047
1048static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1049 int nr)
1050{
1051 unsigned long offset = (unsigned long)c;
1052 offset += offsetof(struct btrfs_chunk, stripe);
1053 offset += nr * sizeof(struct btrfs_stripe);
1054 return (struct btrfs_stripe *)offset;
1055}
1056
1057static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1058{
1059 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1060}
1061
1062static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1063 struct btrfs_chunk *c, int nr)
1064{
1065 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1066}
1067
1068static inline void btrfs_set_stripe_offset_nr(struct extent_buffer *eb,
1069 struct btrfs_chunk *c, int nr,
1070 u64 val)
1071{
1072 btrfs_set_stripe_offset(eb, btrfs_stripe_nr(c, nr), val);
1073}
1074
1075static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1076 struct btrfs_chunk *c, int nr)
1077{
1078 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1079}
1080
1081static inline void btrfs_set_stripe_devid_nr(struct extent_buffer *eb,
1082 struct btrfs_chunk *c, int nr,
1083 u64 val)
1084{
1085 btrfs_set_stripe_devid(eb, btrfs_stripe_nr(c, nr), val);
1086}
1087
1088/* struct btrfs_block_group_item */
1089BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1090 used, 64);
1091BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1092 used, 64);
1093BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1094 struct btrfs_block_group_item, chunk_objectid, 64);
1095
1096BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1097 struct btrfs_block_group_item, chunk_objectid, 64);
1098BTRFS_SETGET_FUNCS(disk_block_group_flags,
1099 struct btrfs_block_group_item, flags, 64);
1100BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1101 struct btrfs_block_group_item, flags, 64);
1102
1103/* struct btrfs_inode_ref */
1104BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1105BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1106
1107/* struct btrfs_inode_item */
1108BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1109BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1110BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1111BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1112BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1113BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1114BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1115BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1116BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1117BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1118BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
1119BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
1120 compat_flags, 16);
1121
1122static inline struct btrfs_timespec *
1123btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1124{
1125 unsigned long ptr = (unsigned long)inode_item;
1126 ptr += offsetof(struct btrfs_inode_item, atime);
1127 return (struct btrfs_timespec *)ptr;
1128}
1129
1130static inline struct btrfs_timespec *
1131btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1132{
1133 unsigned long ptr = (unsigned long)inode_item;
1134 ptr += offsetof(struct btrfs_inode_item, mtime);
1135 return (struct btrfs_timespec *)ptr;
1136}
1137
1138static inline struct btrfs_timespec *
1139btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1140{
1141 unsigned long ptr = (unsigned long)inode_item;
1142 ptr += offsetof(struct btrfs_inode_item, ctime);
1143 return (struct btrfs_timespec *)ptr;
1144}
1145
1146static inline struct btrfs_timespec *
1147btrfs_inode_otime(struct btrfs_inode_item *inode_item)
1148{
1149 unsigned long ptr = (unsigned long)inode_item;
1150 ptr += offsetof(struct btrfs_inode_item, otime);
1151 return (struct btrfs_timespec *)ptr;
1152}
1153
1154BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1155BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1156
1157/* struct btrfs_dev_extent */
1158BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1159 chunk_tree, 64);
1160BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1161 chunk_objectid, 64);
1162BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1163 chunk_offset, 64);
1164BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1165
1166static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1167{
1168 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1169 return (u8 *)((unsigned long)dev + ptr);
1170}
1171
1172/* struct btrfs_extent_ref */
1173BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
1174BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
1175BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
1176BTRFS_SETGET_FUNCS(ref_num_refs, struct btrfs_extent_ref, num_refs, 32);
1177
1178BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
1179BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
1180 generation, 64);
1181BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
1182 objectid, 64);
1183BTRFS_SETGET_STACK_FUNCS(stack_ref_num_refs, struct btrfs_extent_ref,
1184 num_refs, 32);
1185
1186/* struct btrfs_extent_item */
1187BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
1188BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
1189 refs, 32);
1190
1191/* struct btrfs_node */
1192BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1193BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1194
1195static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1196{
1197 unsigned long ptr;
1198 ptr = offsetof(struct btrfs_node, ptrs) +
1199 sizeof(struct btrfs_key_ptr) * nr;
1200 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1201}
1202
1203static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1204 int nr, u64 val)
1205{
1206 unsigned long ptr;
1207 ptr = offsetof(struct btrfs_node, ptrs) +
1208 sizeof(struct btrfs_key_ptr) * nr;
1209 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1210}
1211
1212static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1213{
1214 unsigned long ptr;
1215 ptr = offsetof(struct btrfs_node, ptrs) +
1216 sizeof(struct btrfs_key_ptr) * nr;
1217 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1218}
1219
1220static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1221 int nr, u64 val)
1222{
1223 unsigned long ptr;
1224 ptr = offsetof(struct btrfs_node, ptrs) +
1225 sizeof(struct btrfs_key_ptr) * nr;
1226 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1227}
1228
1229static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1230{
1231 return offsetof(struct btrfs_node, ptrs) +
1232 sizeof(struct btrfs_key_ptr) * nr;
1233}
1234
1235void btrfs_node_key(struct extent_buffer *eb,
1236 struct btrfs_disk_key *disk_key, int nr);
1237
1238static inline void btrfs_set_node_key(struct extent_buffer *eb,
1239 struct btrfs_disk_key *disk_key, int nr)
1240{
1241 unsigned long ptr;
1242 ptr = btrfs_node_key_ptr_offset(nr);
1243 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1244 struct btrfs_key_ptr, key, disk_key);
1245}
1246
1247/* struct btrfs_item */
1248BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1249BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1250
1251static inline unsigned long btrfs_item_nr_offset(int nr)
1252{
1253 return offsetof(struct btrfs_leaf, items) +
1254 sizeof(struct btrfs_item) * nr;
1255}
1256
1257static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1258 int nr)
1259{
1260 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1261}
1262
1263static inline u32 btrfs_item_end(struct extent_buffer *eb,
1264 struct btrfs_item *item)
1265{
1266 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1267}
1268
1269static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1270{
1271 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1272}
1273
1274static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1275{
1276 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1277}
1278
1279static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1280{
1281 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1282}
1283
1284static inline void btrfs_item_key(struct extent_buffer *eb,
1285 struct btrfs_disk_key *disk_key, int nr)
1286{
1287 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1288 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1289}
1290
1291static inline void btrfs_set_item_key(struct extent_buffer *eb,
1292 struct btrfs_disk_key *disk_key, int nr)
1293{
1294 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1295 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1296}
1297
1298BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1299
1300/*
1301 * struct btrfs_root_ref
1302 */
1303BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1304BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1305BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1306
1307/* struct btrfs_dir_item */
1308BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1309BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1310BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1311BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1312
1313static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1314 struct btrfs_dir_item *item,
1315 struct btrfs_disk_key *key)
1316{
1317 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1318}
1319
1320static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1321 struct btrfs_dir_item *item,
1322 struct btrfs_disk_key *key)
1323{
1324 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1325}
1326
1327/* struct btrfs_disk_key */
1328BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1329 objectid, 64);
1330BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1331BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1332
1333static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1334 struct btrfs_disk_key *disk)
1335{
1336 cpu->offset = le64_to_cpu(disk->offset);
1337 cpu->type = disk->type;
1338 cpu->objectid = le64_to_cpu(disk->objectid);
1339}
1340
1341static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1342 struct btrfs_key *cpu)
1343{
1344 disk->offset = cpu_to_le64(cpu->offset);
1345 disk->type = cpu->type;
1346 disk->objectid = cpu_to_le64(cpu->objectid);
1347}
1348
1349static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1350 struct btrfs_key *key, int nr)
1351{
1352 struct btrfs_disk_key disk_key;
1353 btrfs_node_key(eb, &disk_key, nr);
1354 btrfs_disk_key_to_cpu(key, &disk_key);
1355}
1356
1357static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1358 struct btrfs_key *key, int nr)
1359{
1360 struct btrfs_disk_key disk_key;
1361 btrfs_item_key(eb, &disk_key, nr);
1362 btrfs_disk_key_to_cpu(key, &disk_key);
1363}
1364
1365static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1366 struct btrfs_dir_item *item,
1367 struct btrfs_key *key)
1368{
1369 struct btrfs_disk_key disk_key;
1370 btrfs_dir_item_key(eb, item, &disk_key);
1371 btrfs_disk_key_to_cpu(key, &disk_key);
1372}
1373
1374
1375static inline u8 btrfs_key_type(struct btrfs_key *key)
1376{
1377 return key->type;
1378}
1379
1380static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1381{
1382 key->type = val;
1383}
1384
1385/* struct btrfs_header */
1386BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1387BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1388 generation, 64);
1389BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1390BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1391BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1392BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1393
1394static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1395{
1396 return (btrfs_header_flags(eb) & flag) == flag;
1397}
1398
1399static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1400{
1401 u64 flags = btrfs_header_flags(eb);
1402 btrfs_set_header_flags(eb, flags | flag);
1403 return (flags & flag) == flag;
1404}
1405
1406static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1407{
1408 u64 flags = btrfs_header_flags(eb);
1409 btrfs_set_header_flags(eb, flags & ~flag);
1410 return (flags & flag) == flag;
1411}
1412
1413static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1414{
1415 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1416 return (u8 *)ptr;
1417}
1418
1419static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1420{
1421 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1422 return (u8 *)ptr;
1423}
1424
1425static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
1426{
1427 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
1428 return (u8 *)ptr;
1429}
1430
1431static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
1432{
1433 unsigned long ptr = offsetof(struct btrfs_header, csum);
1434 return (u8 *)ptr;
1435}
1436
1437static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
1438{
1439 return NULL;
1440}
1441
1442static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
1443{
1444 return NULL;
1445}
1446
1447static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
1448{
1449 return NULL;
1450}
1451
1452static inline int btrfs_is_leaf(struct extent_buffer *eb)
1453{
1454 return (btrfs_header_level(eb) == 0);
1455}
1456
1457/* struct btrfs_root_item */
1458BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1459 generation, 64);
1460BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1461BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1462BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1463
1464BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1465 generation, 64);
1466BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1467BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1468BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1469BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1470BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
1471BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1472BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1473BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1474 last_snapshot, 64);
1475
1476/* struct btrfs_super_block */
1477BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1478BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1479BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1480 generation, 64);
1481BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1482BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1483 struct btrfs_super_block, sys_chunk_array_size, 32);
1484BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1485 struct btrfs_super_block, chunk_root_generation, 64);
1486BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1487 root_level, 8);
1488BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1489 chunk_root, 64);
1490BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1491 chunk_root_level, 8);
1492BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1493 log_root, 64);
1494BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
1495 log_root_level, 8);
1496BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
1497 total_bytes, 64);
1498BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
1499 bytes_used, 64);
1500BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
1501 sectorsize, 32);
1502BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
1503 nodesize, 32);
1504BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
1505 leafsize, 32);
1506BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
1507 stripesize, 32);
1508BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
1509 root_dir_objectid, 64);
1510BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
1511 num_devices, 64);
1512
1513static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
1514{
1515 return offsetof(struct btrfs_leaf, items);
1516}
1517
1518/* struct btrfs_file_extent_item */
1519BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
1520
1521static inline unsigned long btrfs_file_extent_inline_start(struct
1522 btrfs_file_extent_item *e)
1523{
1524 unsigned long offset = (unsigned long)e;
1525 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
1526 return offset;
1527}
1528
1529static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
1530{
1531 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
1532}
1533
1534BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
1535 disk_bytenr, 64);
1536BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
1537 generation, 64);
1538BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
1539 disk_num_bytes, 64);
1540BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
1541 offset, 64);
1542BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
1543 num_bytes, 64);
1544BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
1545 ram_bytes, 64);
1546BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
1547 compression, 8);
1548BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
1549 encryption, 8);
1550BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
1551 other_encoding, 16);
1552
1553/* this returns the number of file bytes represented by the inline item.
1554 * If an item is compressed, this is the uncompressed size
1555 */
1556static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
1557 struct btrfs_file_extent_item *e)
1558{
1559 return btrfs_file_extent_ram_bytes(eb, e);
1560}
1561
1562/*
1563 * this returns the number of bytes used by the item on disk, minus the
1564 * size of any extent headers. If a file is compressed on disk, this is
1565 * the compressed size
1566 */
1567static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
1568 struct btrfs_item *e)
1569{
1570 unsigned long offset;
1571 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
1572 return btrfs_item_size(eb, e) - offset;
1573}
1574
1575static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1576{
1577 return sb->s_fs_info;
1578}
1579
1580static inline int btrfs_set_root_name(struct btrfs_root *root,
1581 const char *name, int len)
1582{
1583 /* if we already have a name just free it */
1584 if (root->name)
1585 kfree(root->name);
1586
1587 root->name = kmalloc(len+1, GFP_KERNEL);
1588 if (!root->name)
1589 return -ENOMEM;
1590
1591 memcpy(root->name, name, len);
1592 root->name[len] ='\0';
1593
1594 return 0;
1595}
1596
1597static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
1598 if (level == 0)
1599 return root->leafsize;
1600 return root->nodesize;
1601}
1602
1603/* helper function to cast into the data area of the leaf. */
1604#define btrfs_item_ptr(leaf, slot, type) \
1605 ((type *)(btrfs_leaf_data(leaf) + \
1606 btrfs_item_offset_nr(leaf, slot)))
1607
1608#define btrfs_item_ptr_offset(leaf, slot) \
1609 ((unsigned long)(btrfs_leaf_data(leaf) + \
1610 btrfs_item_offset_nr(leaf, slot)))
1611
1612static inline struct dentry *fdentry(struct file *file)
1613{
1614 return file->f_path.dentry;
1615}
1616
1617/* extent-tree.c */
1618int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
1619int btrfs_lookup_extent_ref(struct btrfs_trans_handle *trans,
1620 struct btrfs_root *root, u64 bytenr,
1621 u64 num_bytes, u32 *refs);
1622int btrfs_update_pinned_extents(struct btrfs_root *root,
1623 u64 bytenr, u64 num, int pin);
1624int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
1625 struct btrfs_root *root, struct extent_buffer *leaf);
1626int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
1627 struct btrfs_root *root, u64 bytenr);
1628int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1629 struct btrfs_root *root);
1630int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
1631struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1632 btrfs_fs_info *info,
1633 u64 bytenr);
1634struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1635 struct btrfs_block_group_cache
1636 *hint, u64 search_start,
1637 int data, int owner);
1638struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1639 struct btrfs_root *root,
1640 u32 blocksize, u64 parent,
1641 u64 root_objectid,
1642 u64 ref_generation,
1643 int level,
1644 u64 hint,
1645 u64 empty_size);
1646struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
1647 struct btrfs_root *root,
1648 u64 bytenr, u32 blocksize);
1649int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1650 struct btrfs_root *root,
1651 u64 num_bytes, u64 parent, u64 min_bytes,
1652 u64 root_objectid, u64 ref_generation,
1653 u64 owner, u64 empty_size, u64 hint_byte,
1654 u64 search_end, struct btrfs_key *ins, u64 data);
1655int btrfs_alloc_reserved_extent(struct btrfs_trans_handle *trans,
1656 struct btrfs_root *root, u64 parent,
1657 u64 root_objectid, u64 ref_generation,
1658 u64 owner, struct btrfs_key *ins);
1659int btrfs_alloc_logged_extent(struct btrfs_trans_handle *trans,
1660 struct btrfs_root *root, u64 parent,
1661 u64 root_objectid, u64 ref_generation,
1662 u64 owner, struct btrfs_key *ins);
1663int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
1664 struct btrfs_root *root,
1665 u64 num_bytes, u64 min_alloc_size,
1666 u64 empty_size, u64 hint_byte,
1667 u64 search_end, struct btrfs_key *ins,
1668 u64 data);
1669int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1670 struct extent_buffer *orig_buf, struct extent_buffer *buf,
1671 u32 *nr_extents);
1672int btrfs_cache_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1673 struct extent_buffer *buf, u32 nr_extents);
1674int btrfs_update_ref(struct btrfs_trans_handle *trans,
1675 struct btrfs_root *root, struct extent_buffer *orig_buf,
1676 struct extent_buffer *buf, int start_slot, int nr);
1677int btrfs_free_extent(struct btrfs_trans_handle *trans,
1678 struct btrfs_root *root,
1679 u64 bytenr, u64 num_bytes, u64 parent,
1680 u64 root_objectid, u64 ref_generation,
1681 u64 owner_objectid, int pin);
1682int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
1683int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1684 struct btrfs_root *root,
1685 struct extent_io_tree *unpin);
1686int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1687 struct btrfs_root *root,
1688 u64 bytenr, u64 num_bytes, u64 parent,
1689 u64 root_objectid, u64 ref_generation,
1690 u64 owner_objectid);
1691int btrfs_update_extent_ref(struct btrfs_trans_handle *trans,
1692 struct btrfs_root *root, u64 bytenr,
1693 u64 orig_parent, u64 parent,
1694 u64 root_objectid, u64 ref_generation,
1695 u64 owner_objectid);
1696int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1697 struct btrfs_root *root);
1698int btrfs_free_block_groups(struct btrfs_fs_info *info);
1699int btrfs_read_block_groups(struct btrfs_root *root);
1700int btrfs_make_block_group(struct btrfs_trans_handle *trans,
1701 struct btrfs_root *root, u64 bytes_used,
1702 u64 type, u64 chunk_objectid, u64 chunk_offset,
1703 u64 size);
1704int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
1705 struct btrfs_root *root, u64 group_start);
1706int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
1707int btrfs_free_reloc_root(struct btrfs_trans_handle *trans,
1708 struct btrfs_root *root);
1709int btrfs_drop_dead_reloc_roots(struct btrfs_root *root);
1710int btrfs_reloc_tree_cache_ref(struct btrfs_trans_handle *trans,
1711 struct btrfs_root *root,
1712 struct extent_buffer *buf, u64 orig_start);
1713int btrfs_add_dead_reloc_root(struct btrfs_root *root);
1714int btrfs_cleanup_reloc_trees(struct btrfs_root *root);
1715u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
1716/* ctree.c */
1717int btrfs_previous_item(struct btrfs_root *root,
1718 struct btrfs_path *path, u64 min_objectid,
1719 int type);
1720int btrfs_merge_path(struct btrfs_trans_handle *trans,
1721 struct btrfs_root *root,
1722 struct btrfs_key *node_keys,
1723 u64 *nodes, int lowest_level);
1724int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
1725 struct btrfs_root *root, struct btrfs_path *path,
1726 struct btrfs_key *new_key);
1727struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
1728struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
1729int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
1730 struct btrfs_key *key, int lowest_level,
1731 int cache_only, u64 min_trans);
1732int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
1733 struct btrfs_key *max_key,
1734 struct btrfs_path *path, int cache_only,
1735 u64 min_trans);
1736int btrfs_cow_block(struct btrfs_trans_handle *trans,
1737 struct btrfs_root *root, struct extent_buffer *buf,
1738 struct extent_buffer *parent, int parent_slot,
1739 struct extent_buffer **cow_ret, u64 prealloc_dest);
1740int btrfs_copy_root(struct btrfs_trans_handle *trans,
1741 struct btrfs_root *root,
1742 struct extent_buffer *buf,
1743 struct extent_buffer **cow_ret, u64 new_root_objectid);
1744int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1745 *root, struct btrfs_path *path, u32 data_size);
1746int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1747 struct btrfs_root *root,
1748 struct btrfs_path *path,
1749 u32 new_size, int from_end);
1750int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1751 *root, struct btrfs_key *key, struct btrfs_path *p, int
1752 ins_len, int cow);
1753int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1754 struct btrfs_root *root, struct extent_buffer *parent,
1755 int start_slot, int cache_only, u64 *last_ret,
1756 struct btrfs_key *progress);
1757void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1758struct btrfs_path *btrfs_alloc_path(void);
1759void btrfs_free_path(struct btrfs_path *p);
1760void btrfs_init_path(struct btrfs_path *p);
1761int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1762 struct btrfs_path *path, int slot, int nr);
1763int btrfs_del_leaf(struct btrfs_trans_handle *trans,
1764 struct btrfs_root *root,
1765 struct btrfs_path *path, u64 bytenr);
1766static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1767 struct btrfs_root *root,
1768 struct btrfs_path *path)
1769{
1770 return btrfs_del_items(trans, root, path, path->slots[0], 1);
1771}
1772
1773int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1774 *root, struct btrfs_key *key, void *data, u32 data_size);
1775int btrfs_insert_some_items(struct btrfs_trans_handle *trans,
1776 struct btrfs_root *root,
1777 struct btrfs_path *path,
1778 struct btrfs_key *cpu_key, u32 *data_size,
1779 int nr);
1780int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1781 struct btrfs_root *root,
1782 struct btrfs_path *path,
1783 struct btrfs_key *cpu_key, u32 *data_size, int nr);
1784
1785static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1786 struct btrfs_root *root,
1787 struct btrfs_path *path,
1788 struct btrfs_key *key,
1789 u32 data_size)
1790{
1791 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1792}
1793
1794int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1795int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1796int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1797int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1798 *root);
1799int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
1800 struct btrfs_root *root,
1801 struct extent_buffer *node,
1802 struct extent_buffer *parent);
1803/* root-item.c */
1804int btrfs_find_root_ref(struct btrfs_root *tree_root,
1805 struct btrfs_path *path,
1806 u64 root_id, u64 ref_id);
1807int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
1808 struct btrfs_root *tree_root,
1809 u64 root_id, u8 type, u64 ref_id,
1810 u64 dirid, u64 sequence,
1811 const char *name, int name_len);
1812int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1813 struct btrfs_key *key);
1814int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1815 *root, struct btrfs_key *key, struct btrfs_root_item
1816 *item);
1817int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1818 *root, struct btrfs_key *key, struct btrfs_root_item
1819 *item);
1820int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1821 btrfs_root_item *item, struct btrfs_key *key);
1822int btrfs_search_root(struct btrfs_root *root, u64 search_start,
1823 u64 *found_objectid);
1824int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1825 struct btrfs_root *latest_root);
1826/* dir-item.c */
1827int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1828 *root, const char *name, int name_len, u64 dir,
1829 struct btrfs_key *location, u8 type, u64 index);
1830struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1831 struct btrfs_root *root,
1832 struct btrfs_path *path, u64 dir,
1833 const char *name, int name_len,
1834 int mod);
1835struct btrfs_dir_item *
1836btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1837 struct btrfs_root *root,
1838 struct btrfs_path *path, u64 dir,
1839 u64 objectid, const char *name, int name_len,
1840 int mod);
1841struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1842 struct btrfs_path *path,
1843 const char *name, int name_len);
1844int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1845 struct btrfs_root *root,
1846 struct btrfs_path *path,
1847 struct btrfs_dir_item *di);
1848int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1849 struct btrfs_root *root, const char *name,
1850 u16 name_len, const void *data, u16 data_len,
1851 u64 dir);
1852struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1853 struct btrfs_root *root,
1854 struct btrfs_path *path, u64 dir,
1855 const char *name, u16 name_len,
1856 int mod);
1857
1858/* orphan.c */
1859int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
1860 struct btrfs_root *root, u64 offset);
1861int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
1862 struct btrfs_root *root, u64 offset);
1863
1864/* inode-map.c */
1865int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1866 struct btrfs_root *fs_root,
1867 u64 dirid, u64 *objectid);
1868int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1869
1870/* inode-item.c */
1871int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1872 struct btrfs_root *root,
1873 const char *name, int name_len,
1874 u64 inode_objectid, u64 ref_objectid, u64 index);
1875int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1876 struct btrfs_root *root,
1877 const char *name, int name_len,
1878 u64 inode_objectid, u64 ref_objectid, u64 *index);
1879int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1880 struct btrfs_root *root,
1881 struct btrfs_path *path, u64 objectid);
1882int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1883 *root, struct btrfs_path *path,
1884 struct btrfs_key *location, int mod);
1885
1886/* file-item.c */
1887int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
1888 struct bio *bio);
1889int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1890 struct btrfs_root *root,
1891 u64 objectid, u64 pos,
1892 u64 disk_offset, u64 disk_num_bytes,
1893 u64 num_bytes, u64 offset, u64 ram_bytes,
1894 u8 compression, u8 encryption, u16 other_encoding);
1895int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1896 struct btrfs_root *root,
1897 struct btrfs_path *path, u64 objectid,
1898 u64 bytenr, int mod);
1899int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
1900 struct btrfs_root *root, struct inode *inode,
1901 struct btrfs_ordered_sum *sums);
1902int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
1903 struct bio *bio);
1904int btrfs_csum_file_bytes(struct btrfs_root *root, struct inode *inode,
1905 u64 start, unsigned long len);
1906struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1907 struct btrfs_root *root,
1908 struct btrfs_path *path,
1909 u64 objectid, u64 offset,
1910 int cow);
1911int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1912 struct btrfs_root *root, struct btrfs_path *path,
1913 u64 isize);
1914/* inode.c */
1915
1916/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
1917#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
1918#define ClearPageChecked ClearPageFsMisc
1919#define SetPageChecked SetPageFsMisc
1920#define PageChecked PageFsMisc
1921#endif
1922
1923struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
1924int btrfs_set_inode_index(struct inode *dir, u64 *index);
1925int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
1926 struct btrfs_root *root,
1927 struct inode *dir, struct inode *inode,
1928 const char *name, int name_len);
1929int btrfs_add_link(struct btrfs_trans_handle *trans,
1930 struct inode *parent_inode, struct inode *inode,
1931 const char *name, int name_len, int add_backref, u64 index);
1932int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
1933 struct btrfs_root *root,
1934 struct inode *inode, u64 new_size,
1935 u32 min_type);
1936
1937int btrfs_start_delalloc_inodes(struct btrfs_root *root);
1938int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end);
1939int btrfs_writepages(struct address_space *mapping,
1940 struct writeback_control *wbc);
1941int btrfs_create_subvol_root(struct btrfs_root *new_root, struct dentry *dentry,
1942 struct btrfs_trans_handle *trans, u64 new_dirid,
1943 struct btrfs_block_group_cache *block_group);
1944
1945int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
1946 size_t size, struct bio *bio, unsigned long bio_flags);
1947
1948unsigned long btrfs_force_ra(struct address_space *mapping,
1949 struct file_ra_state *ra, struct file *file,
1950 pgoff_t offset, pgoff_t last_index);
1951int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1952 int for_del);
1953int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1954int btrfs_readpage(struct file *file, struct page *page);
1955void btrfs_delete_inode(struct inode *inode);
1956void btrfs_put_inode(struct inode *inode);
1957void btrfs_read_locked_inode(struct inode *inode);
1958int btrfs_write_inode(struct inode *inode, int wait);
1959void btrfs_dirty_inode(struct inode *inode);
1960struct inode *btrfs_alloc_inode(struct super_block *sb);
1961void btrfs_destroy_inode(struct inode *inode);
1962int btrfs_init_cachep(void);
1963void btrfs_destroy_cachep(void);
1964long btrfs_ioctl_trans_end(struct file *file);
1965struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1966 struct btrfs_root *root, int wait);
1967struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1968 struct btrfs_root *root);
1969struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
1970 struct btrfs_root *root, int *is_new);
1971int btrfs_commit_write(struct file *file, struct page *page,
1972 unsigned from, unsigned to);
1973struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1974 size_t page_offset, u64 start, u64 end,
1975 int create);
1976int btrfs_update_inode(struct btrfs_trans_handle *trans,
1977 struct btrfs_root *root,
1978 struct inode *inode);
1979int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
1980int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
1981void btrfs_orphan_cleanup(struct btrfs_root *root);
1982int btrfs_cont_expand(struct inode *inode, loff_t size);
1983
1984/* ioctl.c */
1985long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1986
1987/* file.c */
1988int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync);
1989int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
1990 int skip_pinned);
1991int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1992extern struct file_operations btrfs_file_operations;
1993int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1994 struct btrfs_root *root, struct inode *inode,
1995 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1996int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
1997 struct btrfs_root *root,
1998 struct inode *inode, u64 start, u64 end);
1999int btrfs_release_file(struct inode *inode, struct file *file);
2000
2001/* tree-defrag.c */
2002int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2003 struct btrfs_root *root, int cache_only);
2004
2005/* sysfs.c */
2006int btrfs_init_sysfs(void);
2007void btrfs_exit_sysfs(void);
2008int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
2009int btrfs_sysfs_add_root(struct btrfs_root *root);
2010void btrfs_sysfs_del_root(struct btrfs_root *root);
2011void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
2012
2013/* xattr.c */
2014ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2015
2016/* super.c */
2017u64 btrfs_parse_size(char *str);
2018int btrfs_parse_options(struct btrfs_root *root, char *options);
2019int btrfs_sync_fs(struct super_block *sb, int wait);
2020
2021/* acl.c */
2022int btrfs_check_acl(struct inode *inode, int mask);
2023int btrfs_init_acl(struct inode *inode, struct inode *dir);
2024int btrfs_acl_chmod(struct inode *inode);
2025
2026/* free-space-cache.c */
2027int btrfs_add_free_space(struct btrfs_block_group_cache *block_group,
2028 u64 bytenr, u64 size);
2029int btrfs_add_free_space_lock(struct btrfs_block_group_cache *block_group,
2030 u64 offset, u64 bytes);
2031int btrfs_remove_free_space(struct btrfs_block_group_cache *block_group,
2032 u64 bytenr, u64 size);
2033int btrfs_remove_free_space_lock(struct btrfs_block_group_cache *block_group,
2034 u64 offset, u64 bytes);
2035void btrfs_remove_free_space_cache(struct btrfs_block_group_cache
2036 *block_group);
2037struct btrfs_free_space *btrfs_find_free_space(struct btrfs_block_group_cache
2038 *block_group, u64 offset,
2039 u64 bytes);
2040void btrfs_dump_free_space(struct btrfs_block_group_cache *block_group,
2041 u64 bytes);
2042u64 btrfs_block_group_free_space(struct btrfs_block_group_cache *block_group);
2043#endif
generated by cgit v1.2.2 (git 2.25.0) at 2025-09-01 14:12:06 -0400