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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/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 <linux/btrfs_tree.h>
37#include <linux/workqueue.h>
38#include <linux/security.h>
39#include <linux/sizes.h>
40#include <linux/dynamic_debug.h>
41#include "extent_io.h"
42#include "extent_map.h"
43#include "async-thread.h"
44
45struct btrfs_trans_handle;
46struct btrfs_transaction;
47struct btrfs_pending_snapshot;
48extern struct kmem_cache *btrfs_trans_handle_cachep;
49extern struct kmem_cache *btrfs_transaction_cachep;
50extern struct kmem_cache *btrfs_bit_radix_cachep;
51extern struct kmem_cache *btrfs_path_cachep;
52extern struct kmem_cache *btrfs_free_space_cachep;
53struct btrfs_ordered_sum;
54
55#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
56#define STATIC noinline
57#else
58#define STATIC static noinline
59#endif
60
61#define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
62
63#define BTRFS_MAX_MIRRORS 3
64
65#define BTRFS_MAX_LEVEL 8
66
67#define BTRFS_COMPAT_EXTENT_TREE_V0
68
69/*
70 * the max metadata block size. This limit is somewhat artificial,
71 * but the memmove costs go through the roof for larger blocks.
72 */
73#define BTRFS_MAX_METADATA_BLOCKSIZE 65536
74
75/*
76 * we can actually store much bigger names, but lets not confuse the rest
77 * of linux
78 */
79#define BTRFS_NAME_LEN 255
80
81/*
82 * Theoretical limit is larger, but we keep this down to a sane
83 * value. That should limit greatly the possibility of collisions on
84 * inode ref items.
85 */
86#define BTRFS_LINK_MAX 65535U
87
88static const int btrfs_csum_sizes[] = { 4 };
89
90/* four bytes for CRC32 */
91#define BTRFS_EMPTY_DIR_SIZE 0
92
93/* ioprio of readahead is set to idle */
94#define BTRFS_IOPRIO_READA (IOPRIO_PRIO_VALUE(IOPRIO_CLASS_IDLE, 0))
95
96#define BTRFS_DIRTY_METADATA_THRESH SZ_32M
97
98#define BTRFS_MAX_EXTENT_SIZE SZ_128M
99
100struct btrfs_mapping_tree {
101 struct extent_map_tree map_tree;
102};
103
104static inline unsigned long btrfs_chunk_item_size(int num_stripes)
105{
106 BUG_ON(num_stripes == 0);
107 return sizeof(struct btrfs_chunk) +
108 sizeof(struct btrfs_stripe) * (num_stripes - 1);
109}
110
111/*
112 * File system states
113 */
114#define BTRFS_FS_STATE_ERROR 0
115#define BTRFS_FS_STATE_REMOUNTING 1
116#define BTRFS_FS_STATE_TRANS_ABORTED 2
117#define BTRFS_FS_STATE_DEV_REPLACING 3
118#define BTRFS_FS_STATE_DUMMY_FS_INFO 4
119
120#define BTRFS_BACKREF_REV_MAX 256
121#define BTRFS_BACKREF_REV_SHIFT 56
122#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
123 BTRFS_BACKREF_REV_SHIFT)
124
125#define BTRFS_OLD_BACKREF_REV 0
126#define BTRFS_MIXED_BACKREF_REV 1
127
128/*
129 * every tree block (leaf or node) starts with this header.
130 */
131struct btrfs_header {
132 /* these first four must match the super block */
133 u8 csum[BTRFS_CSUM_SIZE];
134 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
135 __le64 bytenr; /* which block this node is supposed to live in */
136 __le64 flags;
137
138 /* allowed to be different from the super from here on down */
139 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
140 __le64 generation;
141 __le64 owner;
142 __le32 nritems;
143 u8 level;
144} __attribute__ ((__packed__));
145
146/*
147 * this is a very generous portion of the super block, giving us
148 * room to translate 14 chunks with 3 stripes each.
149 */
150#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
151
152/*
153 * just in case we somehow lose the roots and are not able to mount,
154 * we store an array of the roots from previous transactions
155 * in the super.
156 */
157#define BTRFS_NUM_BACKUP_ROOTS 4
158struct btrfs_root_backup {
159 __le64 tree_root;
160 __le64 tree_root_gen;
161
162 __le64 chunk_root;
163 __le64 chunk_root_gen;
164
165 __le64 extent_root;
166 __le64 extent_root_gen;
167
168 __le64 fs_root;
169 __le64 fs_root_gen;
170
171 __le64 dev_root;
172 __le64 dev_root_gen;
173
174 __le64 csum_root;
175 __le64 csum_root_gen;
176
177 __le64 total_bytes;
178 __le64 bytes_used;
179 __le64 num_devices;
180 /* future */
181 __le64 unused_64[4];
182
183 u8 tree_root_level;
184 u8 chunk_root_level;
185 u8 extent_root_level;
186 u8 fs_root_level;
187 u8 dev_root_level;
188 u8 csum_root_level;
189 /* future and to align */
190 u8 unused_8[10];
191} __attribute__ ((__packed__));
192
193/*
194 * the super block basically lists the main trees of the FS
195 * it currently lacks any block count etc etc
196 */
197struct btrfs_super_block {
198 u8 csum[BTRFS_CSUM_SIZE];
199 /* the first 4 fields must match struct btrfs_header */
200 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
201 __le64 bytenr; /* this block number */
202 __le64 flags;
203
204 /* allowed to be different from the btrfs_header from here own down */
205 __le64 magic;
206 __le64 generation;
207 __le64 root;
208 __le64 chunk_root;
209 __le64 log_root;
210
211 /* this will help find the new super based on the log root */
212 __le64 log_root_transid;
213 __le64 total_bytes;
214 __le64 bytes_used;
215 __le64 root_dir_objectid;
216 __le64 num_devices;
217 __le32 sectorsize;
218 __le32 nodesize;
219 __le32 __unused_leafsize;
220 __le32 stripesize;
221 __le32 sys_chunk_array_size;
222 __le64 chunk_root_generation;
223 __le64 compat_flags;
224 __le64 compat_ro_flags;
225 __le64 incompat_flags;
226 __le16 csum_type;
227 u8 root_level;
228 u8 chunk_root_level;
229 u8 log_root_level;
230 struct btrfs_dev_item dev_item;
231
232 char label[BTRFS_LABEL_SIZE];
233
234 __le64 cache_generation;
235 __le64 uuid_tree_generation;
236
237 /* future expansion */
238 __le64 reserved[30];
239 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
240 struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
241} __attribute__ ((__packed__));
242
243/*
244 * Compat flags that we support. If any incompat flags are set other than the
245 * ones specified below then we will fail to mount
246 */
247#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
248#define BTRFS_FEATURE_COMPAT_SAFE_SET 0ULL
249#define BTRFS_FEATURE_COMPAT_SAFE_CLEAR 0ULL
250
251#define BTRFS_FEATURE_COMPAT_RO_SUPP \
252 (BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE | \
253 BTRFS_FEATURE_COMPAT_RO_FREE_SPACE_TREE_VALID)
254
255#define BTRFS_FEATURE_COMPAT_RO_SAFE_SET 0ULL
256#define BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR 0ULL
257
258#define BTRFS_FEATURE_INCOMPAT_SUPP \
259 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
260 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
261 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
262 BTRFS_FEATURE_INCOMPAT_BIG_METADATA | \
263 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO | \
264 BTRFS_FEATURE_INCOMPAT_RAID56 | \
265 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF | \
266 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA | \
267 BTRFS_FEATURE_INCOMPAT_NO_HOLES)
268
269#define BTRFS_FEATURE_INCOMPAT_SAFE_SET \
270 (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)
271#define BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR 0ULL
272
273/*
274 * A leaf is full of items. offset and size tell us where to find
275 * the item in the leaf (relative to the start of the data area)
276 */
277struct btrfs_item {
278 struct btrfs_disk_key key;
279 __le32 offset;
280 __le32 size;
281} __attribute__ ((__packed__));
282
283/*
284 * leaves have an item area and a data area:
285 * [item0, item1....itemN] [free space] [dataN...data1, data0]
286 *
287 * The data is separate from the items to get the keys closer together
288 * during searches.
289 */
290struct btrfs_leaf {
291 struct btrfs_header header;
292 struct btrfs_item items[];
293} __attribute__ ((__packed__));
294
295/*
296 * all non-leaf blocks are nodes, they hold only keys and pointers to
297 * other blocks
298 */
299struct btrfs_key_ptr {
300 struct btrfs_disk_key key;
301 __le64 blockptr;
302 __le64 generation;
303} __attribute__ ((__packed__));
304
305struct btrfs_node {
306 struct btrfs_header header;
307 struct btrfs_key_ptr ptrs[];
308} __attribute__ ((__packed__));
309
310/*
311 * btrfs_paths remember the path taken from the root down to the leaf.
312 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
313 * to any other levels that are present.
314 *
315 * The slots array records the index of the item or block pointer
316 * used while walking the tree.
317 */
318enum { READA_NONE = 0, READA_BACK, READA_FORWARD };
319struct btrfs_path {
320 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
321 int slots[BTRFS_MAX_LEVEL];
322 /* if there is real range locking, this locks field will change */
323 u8 locks[BTRFS_MAX_LEVEL];
324 u8 reada;
325 /* keep some upper locks as we walk down */
326 u8 lowest_level;
327
328 /*
329 * set by btrfs_split_item, tells search_slot to keep all locks
330 * and to force calls to keep space in the nodes
331 */
332 unsigned int search_for_split:1;
333 unsigned int keep_locks:1;
334 unsigned int skip_locking:1;
335 unsigned int leave_spinning:1;
336 unsigned int search_commit_root:1;
337 unsigned int need_commit_sem:1;
338 unsigned int skip_release_on_error:1;
339};
340#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r->fs_info) >> 4) - \
341 sizeof(struct btrfs_item))
342struct btrfs_dev_replace {
343 u64 replace_state; /* see #define above */
344 u64 time_started; /* seconds since 1-Jan-1970 */
345 u64 time_stopped; /* seconds since 1-Jan-1970 */
346 atomic64_t num_write_errors;
347 atomic64_t num_uncorrectable_read_errors;
348
349 u64 cursor_left;
350 u64 committed_cursor_left;
351 u64 cursor_left_last_write_of_item;
352 u64 cursor_right;
353
354 u64 cont_reading_from_srcdev_mode; /* see #define above */
355
356 int is_valid;
357 int item_needs_writeback;
358 struct btrfs_device *srcdev;
359 struct btrfs_device *tgtdev;
360
361 pid_t lock_owner;
362 atomic_t nesting_level;
363 struct mutex lock_finishing_cancel_unmount;
364 rwlock_t lock;
365 atomic_t read_locks;
366 atomic_t blocking_readers;
367 wait_queue_head_t read_lock_wq;
368
369 struct btrfs_scrub_progress scrub_progress;
370};
371
372/* For raid type sysfs entries */
373struct raid_kobject {
374 int raid_type;
375 struct kobject kobj;
376};
377
378struct btrfs_space_info {
379 spinlock_t lock;
380
381 u64 total_bytes; /* total bytes in the space,
382 this doesn't take mirrors into account */
383 u64 bytes_used; /* total bytes used,
384 this doesn't take mirrors into account */
385 u64 bytes_pinned; /* total bytes pinned, will be freed when the
386 transaction finishes */
387 u64 bytes_reserved; /* total bytes the allocator has reserved for
388 current allocations */
389 u64 bytes_may_use; /* number of bytes that may be used for
390 delalloc/allocations */
391 u64 bytes_readonly; /* total bytes that are read only */
392
393 u64 max_extent_size; /* This will hold the maximum extent size of
394 the space info if we had an ENOSPC in the
395 allocator. */
396
397 unsigned int full:1; /* indicates that we cannot allocate any more
398 chunks for this space */
399 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
400
401 unsigned int flush:1; /* set if we are trying to make space */
402
403 unsigned int force_alloc; /* set if we need to force a chunk
404 alloc for this space */
405
406 u64 disk_used; /* total bytes used on disk */
407 u64 disk_total; /* total bytes on disk, takes mirrors into
408 account */
409
410 u64 flags;
411
412 /*
413 * bytes_pinned is kept in line with what is actually pinned, as in
414 * we've called update_block_group and dropped the bytes_used counter
415 * and increased the bytes_pinned counter. However this means that
416 * bytes_pinned does not reflect the bytes that will be pinned once the
417 * delayed refs are flushed, so this counter is inc'ed every time we
418 * call btrfs_free_extent so it is a realtime count of what will be
419 * freed once the transaction is committed. It will be zeroed every
420 * time the transaction commits.
421 */
422 struct percpu_counter total_bytes_pinned;
423
424 struct list_head list;
425 /* Protected by the spinlock 'lock'. */
426 struct list_head ro_bgs;
427 struct list_head priority_tickets;
428 struct list_head tickets;
429 /*
430 * tickets_id just indicates the next ticket will be handled, so note
431 * it's not stored per ticket.
432 */
433 u64 tickets_id;
434
435 struct rw_semaphore groups_sem;
436 /* for block groups in our same type */
437 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
438 wait_queue_head_t wait;
439
440 struct kobject kobj;
441 struct kobject *block_group_kobjs[BTRFS_NR_RAID_TYPES];
442};
443
444#define BTRFS_BLOCK_RSV_GLOBAL 1
445#define BTRFS_BLOCK_RSV_DELALLOC 2
446#define BTRFS_BLOCK_RSV_TRANS 3
447#define BTRFS_BLOCK_RSV_CHUNK 4
448#define BTRFS_BLOCK_RSV_DELOPS 5
449#define BTRFS_BLOCK_RSV_EMPTY 6
450#define BTRFS_BLOCK_RSV_TEMP 7
451
452struct btrfs_block_rsv {
453 u64 size;
454 u64 reserved;
455 struct btrfs_space_info *space_info;
456 spinlock_t lock;
457 unsigned short full;
458 unsigned short type;
459 unsigned short failfast;
460};
461
462/*
463 * free clusters are used to claim free space in relatively large chunks,
464 * allowing us to do less seeky writes. They are used for all metadata
465 * allocations and data allocations in ssd mode.
466 */
467struct btrfs_free_cluster {
468 spinlock_t lock;
469 spinlock_t refill_lock;
470 struct rb_root root;
471
472 /* largest extent in this cluster */
473 u64 max_size;
474
475 /* first extent starting offset */
476 u64 window_start;
477
478 /* We did a full search and couldn't create a cluster */
479 bool fragmented;
480
481 struct btrfs_block_group_cache *block_group;
482 /*
483 * when a cluster is allocated from a block group, we put the
484 * cluster onto a list in the block group so that it can
485 * be freed before the block group is freed.
486 */
487 struct list_head block_group_list;
488};
489
490enum btrfs_caching_type {
491 BTRFS_CACHE_NO = 0,
492 BTRFS_CACHE_STARTED = 1,
493 BTRFS_CACHE_FAST = 2,
494 BTRFS_CACHE_FINISHED = 3,
495 BTRFS_CACHE_ERROR = 4,
496};
497
498enum btrfs_disk_cache_state {
499 BTRFS_DC_WRITTEN = 0,
500 BTRFS_DC_ERROR = 1,
501 BTRFS_DC_CLEAR = 2,
502 BTRFS_DC_SETUP = 3,
503};
504
505struct btrfs_caching_control {
506 struct list_head list;
507 struct mutex mutex;
508 wait_queue_head_t wait;
509 struct btrfs_work work;
510 struct btrfs_block_group_cache *block_group;
511 u64 progress;
512 atomic_t count;
513};
514
515/* Once caching_thread() finds this much free space, it will wake up waiters. */
516#define CACHING_CTL_WAKE_UP (1024 * 1024 * 2)
517
518struct btrfs_io_ctl {
519 void *cur, *orig;
520 struct page *page;
521 struct page **pages;
522 struct btrfs_fs_info *fs_info;
523 struct inode *inode;
524 unsigned long size;
525 int index;
526 int num_pages;
527 int entries;
528 int bitmaps;
529 unsigned check_crcs:1;
530};
531
532struct btrfs_block_group_cache {
533 struct btrfs_key key;
534 struct btrfs_block_group_item item;
535 struct btrfs_fs_info *fs_info;
536 struct inode *inode;
537 spinlock_t lock;
538 u64 pinned;
539 u64 reserved;
540 u64 delalloc_bytes;
541 u64 bytes_super;
542 u64 flags;
543 u64 cache_generation;
544 u32 sectorsize;
545
546 /*
547 * If the free space extent count exceeds this number, convert the block
548 * group to bitmaps.
549 */
550 u32 bitmap_high_thresh;
551
552 /*
553 * If the free space extent count drops below this number, convert the
554 * block group back to extents.
555 */
556 u32 bitmap_low_thresh;
557
558 /*
559 * It is just used for the delayed data space allocation because
560 * only the data space allocation and the relative metadata update
561 * can be done cross the transaction.
562 */
563 struct rw_semaphore data_rwsem;
564
565 /* for raid56, this is a full stripe, without parity */
566 unsigned long full_stripe_len;
567
568 unsigned int ro;
569 unsigned int iref:1;
570 unsigned int has_caching_ctl:1;
571 unsigned int removed:1;
572
573 int disk_cache_state;
574
575 /* cache tracking stuff */
576 int cached;
577 struct btrfs_caching_control *caching_ctl;
578 u64 last_byte_to_unpin;
579
580 struct btrfs_space_info *space_info;
581
582 /* free space cache stuff */
583 struct btrfs_free_space_ctl *free_space_ctl;
584
585 /* block group cache stuff */
586 struct rb_node cache_node;
587
588 /* for block groups in the same raid type */
589 struct list_head list;
590
591 /* usage count */
592 atomic_t count;
593
594 /* List of struct btrfs_free_clusters for this block group.
595 * Today it will only have one thing on it, but that may change
596 */
597 struct list_head cluster_list;
598
599 /* For delayed block group creation or deletion of empty block groups */
600 struct list_head bg_list;
601
602 /* For read-only block groups */
603 struct list_head ro_list;
604
605 atomic_t trimming;
606
607 /* For dirty block groups */
608 struct list_head dirty_list;
609 struct list_head io_list;
610
611 struct btrfs_io_ctl io_ctl;
612
613 /*
614 * Incremented when doing extent allocations and holding a read lock
615 * on the space_info's groups_sem semaphore.
616 * Decremented when an ordered extent that represents an IO against this
617 * block group's range is created (after it's added to its inode's
618 * root's list of ordered extents) or immediately after the allocation
619 * if it's a metadata extent or fallocate extent (for these cases we
620 * don't create ordered extents).
621 */
622 atomic_t reservations;
623
624 /*
625 * Incremented while holding the spinlock *lock* by a task checking if
626 * it can perform a nocow write (incremented if the value for the *ro*
627 * field is 0). Decremented by such tasks once they create an ordered
628 * extent or before that if some error happens before reaching that step.
629 * This is to prevent races between block group relocation and nocow
630 * writes through direct IO.
631 */
632 atomic_t nocow_writers;
633
634 /* Lock for free space tree operations. */
635 struct mutex free_space_lock;
636
637 /*
638 * Does the block group need to be added to the free space tree?
639 * Protected by free_space_lock.
640 */
641 int needs_free_space;
642};
643
644/* delayed seq elem */
645struct seq_list {
646 struct list_head list;
647 u64 seq;
648};
649
650#define SEQ_LIST_INIT(name) { .list = LIST_HEAD_INIT((name).list), .seq = 0 }
651
652enum btrfs_orphan_cleanup_state {
653 ORPHAN_CLEANUP_STARTED = 1,
654 ORPHAN_CLEANUP_DONE = 2,
655};
656
657/* used by the raid56 code to lock stripes for read/modify/write */
658struct btrfs_stripe_hash {
659 struct list_head hash_list;
660 wait_queue_head_t wait;
661 spinlock_t lock;
662};
663
664/* used by the raid56 code to lock stripes for read/modify/write */
665struct btrfs_stripe_hash_table {
666 struct list_head stripe_cache;
667 spinlock_t cache_lock;
668 int cache_size;
669 struct btrfs_stripe_hash table[];
670};
671
672#define BTRFS_STRIPE_HASH_TABLE_BITS 11
673
674void btrfs_init_async_reclaim_work(struct work_struct *work);
675
676/* fs_info */
677struct reloc_control;
678struct btrfs_device;
679struct btrfs_fs_devices;
680struct btrfs_balance_control;
681struct btrfs_delayed_root;
682
683#define BTRFS_FS_BARRIER 1
684#define BTRFS_FS_CLOSING_START 2
685#define BTRFS_FS_CLOSING_DONE 3
686#define BTRFS_FS_LOG_RECOVERING 4
687#define BTRFS_FS_OPEN 5
688#define BTRFS_FS_QUOTA_ENABLED 6
689#define BTRFS_FS_QUOTA_ENABLING 7
690#define BTRFS_FS_QUOTA_DISABLING 8
691#define BTRFS_FS_UPDATE_UUID_TREE_GEN 9
692#define BTRFS_FS_CREATING_FREE_SPACE_TREE 10
693#define BTRFS_FS_BTREE_ERR 11
694#define BTRFS_FS_LOG1_ERR 12
695#define BTRFS_FS_LOG2_ERR 13
696
697struct btrfs_fs_info {
698 u8 fsid[BTRFS_FSID_SIZE];
699 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
700 unsigned long flags;
701 struct btrfs_root *extent_root;
702 struct btrfs_root *tree_root;
703 struct btrfs_root *chunk_root;
704 struct btrfs_root *dev_root;
705 struct btrfs_root *fs_root;
706 struct btrfs_root *csum_root;
707 struct btrfs_root *quota_root;
708 struct btrfs_root *uuid_root;
709 struct btrfs_root *free_space_root;
710
711 /* the log root tree is a directory of all the other log roots */
712 struct btrfs_root *log_root_tree;
713
714 spinlock_t fs_roots_radix_lock;
715 struct radix_tree_root fs_roots_radix;
716
717 /* block group cache stuff */
718 spinlock_t block_group_cache_lock;
719 u64 first_logical_byte;
720 struct rb_root block_group_cache_tree;
721
722 /* keep track of unallocated space */
723 spinlock_t free_chunk_lock;
724 u64 free_chunk_space;
725
726 struct extent_io_tree freed_extents[2];
727 struct extent_io_tree *pinned_extents;
728
729 /* logical->physical extent mapping */
730 struct btrfs_mapping_tree mapping_tree;
731
732 /*
733 * block reservation for extent, checksum, root tree and
734 * delayed dir index item
735 */
736 struct btrfs_block_rsv global_block_rsv;
737 /* block reservation for delay allocation */
738 struct btrfs_block_rsv delalloc_block_rsv;
739 /* block reservation for metadata operations */
740 struct btrfs_block_rsv trans_block_rsv;
741 /* block reservation for chunk tree */
742 struct btrfs_block_rsv chunk_block_rsv;
743 /* block reservation for delayed operations */
744 struct btrfs_block_rsv delayed_block_rsv;
745
746 struct btrfs_block_rsv empty_block_rsv;
747
748 u64 generation;
749 u64 last_trans_committed;
750 u64 avg_delayed_ref_runtime;
751
752 /*
753 * this is updated to the current trans every time a full commit
754 * is required instead of the faster short fsync log commits
755 */
756 u64 last_trans_log_full_commit;
757 unsigned long mount_opt;
758 /*
759 * Track requests for actions that need to be done during transaction
760 * commit (like for some mount options).
761 */
762 unsigned long pending_changes;
763 unsigned long compress_type:4;
764 int commit_interval;
765 /*
766 * It is a suggestive number, the read side is safe even it gets a
767 * wrong number because we will write out the data into a regular
768 * extent. The write side(mount/remount) is under ->s_umount lock,
769 * so it is also safe.
770 */
771 u64 max_inline;
772 /*
773 * Protected by ->chunk_mutex and sb->s_umount.
774 *
775 * The reason that we use two lock to protect it is because only
776 * remount and mount operations can change it and these two operations
777 * are under sb->s_umount, but the read side (chunk allocation) can not
778 * acquire sb->s_umount or the deadlock would happen. So we use two
779 * locks to protect it. On the write side, we must acquire two locks,
780 * and on the read side, we just need acquire one of them.
781 */
782 u64 alloc_start;
783 struct btrfs_transaction *running_transaction;
784 wait_queue_head_t transaction_throttle;
785 wait_queue_head_t transaction_wait;
786 wait_queue_head_t transaction_blocked_wait;
787 wait_queue_head_t async_submit_wait;
788
789 /*
790 * Used to protect the incompat_flags, compat_flags, compat_ro_flags
791 * when they are updated.
792 *
793 * Because we do not clear the flags for ever, so we needn't use
794 * the lock on the read side.
795 *
796 * We also needn't use the lock when we mount the fs, because
797 * there is no other task which will update the flag.
798 */
799 spinlock_t super_lock;
800 struct btrfs_super_block *super_copy;
801 struct btrfs_super_block *super_for_commit;
802 struct super_block *sb;
803 struct inode *btree_inode;
804 struct backing_dev_info bdi;
805 struct mutex tree_log_mutex;
806 struct mutex transaction_kthread_mutex;
807 struct mutex cleaner_mutex;
808 struct mutex chunk_mutex;
809 struct mutex volume_mutex;
810
811 /*
812 * this is taken to make sure we don't set block groups ro after
813 * the free space cache has been allocated on them
814 */
815 struct mutex ro_block_group_mutex;
816
817 /* this is used during read/modify/write to make sure
818 * no two ios are trying to mod the same stripe at the same
819 * time
820 */
821 struct btrfs_stripe_hash_table *stripe_hash_table;
822
823 /*
824 * this protects the ordered operations list only while we are
825 * processing all of the entries on it. This way we make
826 * sure the commit code doesn't find the list temporarily empty
827 * because another function happens to be doing non-waiting preflush
828 * before jumping into the main commit.
829 */
830 struct mutex ordered_operations_mutex;
831
832 struct rw_semaphore commit_root_sem;
833
834 struct rw_semaphore cleanup_work_sem;
835
836 struct rw_semaphore subvol_sem;
837 struct srcu_struct subvol_srcu;
838
839 spinlock_t trans_lock;
840 /*
841 * the reloc mutex goes with the trans lock, it is taken
842 * during commit to protect us from the relocation code
843 */
844 struct mutex reloc_mutex;
845
846 struct list_head trans_list;
847 struct list_head dead_roots;
848 struct list_head caching_block_groups;
849
850 spinlock_t delayed_iput_lock;
851 struct list_head delayed_iputs;
852 struct mutex cleaner_delayed_iput_mutex;
853
854 /* this protects tree_mod_seq_list */
855 spinlock_t tree_mod_seq_lock;
856 atomic64_t tree_mod_seq;
857 struct list_head tree_mod_seq_list;
858
859 /* this protects tree_mod_log */
860 rwlock_t tree_mod_log_lock;
861 struct rb_root tree_mod_log;
862
863 atomic_t nr_async_submits;
864 atomic_t async_submit_draining;
865 atomic_t nr_async_bios;
866 atomic_t async_delalloc_pages;
867 atomic_t open_ioctl_trans;
868
869 /*
870 * this is used to protect the following list -- ordered_roots.
871 */
872 spinlock_t ordered_root_lock;
873
874 /*
875 * all fs/file tree roots in which there are data=ordered extents
876 * pending writeback are added into this list.
877 *
878 * these can span multiple transactions and basically include
879 * every dirty data page that isn't from nodatacow
880 */
881 struct list_head ordered_roots;
882
883 struct mutex delalloc_root_mutex;
884 spinlock_t delalloc_root_lock;
885 /* all fs/file tree roots that have delalloc inodes. */
886 struct list_head delalloc_roots;
887
888 /*
889 * there is a pool of worker threads for checksumming during writes
890 * and a pool for checksumming after reads. This is because readers
891 * can run with FS locks held, and the writers may be waiting for
892 * those locks. We don't want ordering in the pending list to cause
893 * deadlocks, and so the two are serviced separately.
894 *
895 * A third pool does submit_bio to avoid deadlocking with the other
896 * two
897 */
898 struct btrfs_workqueue *workers;
899 struct btrfs_workqueue *delalloc_workers;
900 struct btrfs_workqueue *flush_workers;
901 struct btrfs_workqueue *endio_workers;
902 struct btrfs_workqueue *endio_meta_workers;
903 struct btrfs_workqueue *endio_raid56_workers;
904 struct btrfs_workqueue *endio_repair_workers;
905 struct btrfs_workqueue *rmw_workers;
906 struct btrfs_workqueue *endio_meta_write_workers;
907 struct btrfs_workqueue *endio_write_workers;
908 struct btrfs_workqueue *endio_freespace_worker;
909 struct btrfs_workqueue *submit_workers;
910 struct btrfs_workqueue *caching_workers;
911 struct btrfs_workqueue *readahead_workers;
912
913 /*
914 * fixup workers take dirty pages that didn't properly go through
915 * the cow mechanism and make them safe to write. It happens
916 * for the sys_munmap function call path
917 */
918 struct btrfs_workqueue *fixup_workers;
919 struct btrfs_workqueue *delayed_workers;
920
921 /* the extent workers do delayed refs on the extent allocation tree */
922 struct btrfs_workqueue *extent_workers;
923 struct task_struct *transaction_kthread;
924 struct task_struct *cleaner_kthread;
925 int thread_pool_size;
926
927 struct kobject *space_info_kobj;
928
929 u64 total_pinned;
930
931 /* used to keep from writing metadata until there is a nice batch */
932 struct percpu_counter dirty_metadata_bytes;
933 struct percpu_counter delalloc_bytes;
934 s32 dirty_metadata_batch;
935 s32 delalloc_batch;
936
937 struct list_head dirty_cowonly_roots;
938
939 struct btrfs_fs_devices *fs_devices;
940
941 /*
942 * the space_info list is almost entirely read only. It only changes
943 * when we add a new raid type to the FS, and that happens
944 * very rarely. RCU is used to protect it.
945 */
946 struct list_head space_info;
947
948 struct btrfs_space_info *data_sinfo;
949
950 struct reloc_control *reloc_ctl;
951
952 /* data_alloc_cluster is only used in ssd mode */
953 struct btrfs_free_cluster data_alloc_cluster;
954
955 /* all metadata allocations go through this cluster */
956 struct btrfs_free_cluster meta_alloc_cluster;
957
958 /* auto defrag inodes go here */
959 spinlock_t defrag_inodes_lock;
960 struct rb_root defrag_inodes;
961 atomic_t defrag_running;
962
963 /* Used to protect avail_{data, metadata, system}_alloc_bits */
964 seqlock_t profiles_lock;
965 /*
966 * these three are in extended format (availability of single
967 * chunks is denoted by BTRFS_AVAIL_ALLOC_BIT_SINGLE bit, other
968 * types are denoted by corresponding BTRFS_BLOCK_GROUP_* bits)
969 */
970 u64 avail_data_alloc_bits;
971 u64 avail_metadata_alloc_bits;
972 u64 avail_system_alloc_bits;
973
974 /* restriper state */
975 spinlock_t balance_lock;
976 struct mutex balance_mutex;
977 atomic_t balance_running;
978 atomic_t balance_pause_req;
979 atomic_t balance_cancel_req;
980 struct btrfs_balance_control *balance_ctl;
981 wait_queue_head_t balance_wait_q;
982
983 unsigned data_chunk_allocations;
984 unsigned metadata_ratio;
985
986 void *bdev_holder;
987
988 /* private scrub information */
989 struct mutex scrub_lock;
990 atomic_t scrubs_running;
991 atomic_t scrub_pause_req;
992 atomic_t scrubs_paused;
993 atomic_t scrub_cancel_req;
994 wait_queue_head_t scrub_pause_wait;
995 int scrub_workers_refcnt;
996 struct btrfs_workqueue *scrub_workers;
997 struct btrfs_workqueue *scrub_wr_completion_workers;
998 struct btrfs_workqueue *scrub_nocow_workers;
999 struct btrfs_workqueue *scrub_parity_workers;
1000
1001#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
1002 u32 check_integrity_print_mask;
1003#endif
1004 /* is qgroup tracking in a consistent state? */
1005 u64 qgroup_flags;
1006
1007 /* holds configuration and tracking. Protected by qgroup_lock */
1008 struct rb_root qgroup_tree;
1009 struct rb_root qgroup_op_tree;
1010 spinlock_t qgroup_lock;
1011 spinlock_t qgroup_op_lock;
1012 atomic_t qgroup_op_seq;
1013
1014 /*
1015 * used to avoid frequently calling ulist_alloc()/ulist_free()
1016 * when doing qgroup accounting, it must be protected by qgroup_lock.
1017 */
1018 struct ulist *qgroup_ulist;
1019
1020 /* protect user change for quota operations */
1021 struct mutex qgroup_ioctl_lock;
1022
1023 /* list of dirty qgroups to be written at next commit */
1024 struct list_head dirty_qgroups;
1025
1026 /* used by qgroup for an efficient tree traversal */
1027 u64 qgroup_seq;
1028
1029 /* qgroup rescan items */
1030 struct mutex qgroup_rescan_lock; /* protects the progress item */
1031 struct btrfs_key qgroup_rescan_progress;
1032 struct btrfs_workqueue *qgroup_rescan_workers;
1033 struct completion qgroup_rescan_completion;
1034 struct btrfs_work qgroup_rescan_work;
1035 bool qgroup_rescan_running; /* protected by qgroup_rescan_lock */
1036
1037 /* filesystem state */
1038 unsigned long fs_state;
1039
1040 struct btrfs_delayed_root *delayed_root;
1041
1042 /* readahead tree */
1043 spinlock_t reada_lock;
1044 struct radix_tree_root reada_tree;
1045
1046 /* readahead works cnt */
1047 atomic_t reada_works_cnt;
1048
1049 /* Extent buffer radix tree */
1050 spinlock_t buffer_lock;
1051 struct radix_tree_root buffer_radix;
1052
1053 /* next backup root to be overwritten */
1054 int backup_root_index;
1055
1056 int num_tolerated_disk_barrier_failures;
1057
1058 /* device replace state */
1059 struct btrfs_dev_replace dev_replace;
1060
1061 atomic_t mutually_exclusive_operation_running;
1062
1063 struct percpu_counter bio_counter;
1064 wait_queue_head_t replace_wait;
1065
1066 struct semaphore uuid_tree_rescan_sem;
1067
1068 /* Used to reclaim the metadata space in the background. */
1069 struct work_struct async_reclaim_work;
1070
1071 spinlock_t unused_bgs_lock;
1072 struct list_head unused_bgs;
1073 struct mutex unused_bg_unpin_mutex;
1074 struct mutex delete_unused_bgs_mutex;
1075
1076 /* For btrfs to record security options */
1077 struct security_mnt_opts security_opts;
1078
1079 /*
1080 * Chunks that can't be freed yet (under a trim/discard operation)
1081 * and will be latter freed. Protected by fs_info->chunk_mutex.
1082 */
1083 struct list_head pinned_chunks;
1084
1085 /* Used to record internally whether fs has been frozen */
1086 int fs_frozen;
1087
1088 /* Cached block sizes */
1089 u32 nodesize;
1090 u32 sectorsize;
1091 u32 stripesize;
1092};
1093
1094static inline struct btrfs_fs_info *btrfs_sb(struct super_block *sb)
1095{
1096 return sb->s_fs_info;
1097}
1098
1099struct btrfs_subvolume_writers {
1100 struct percpu_counter counter;
1101 wait_queue_head_t wait;
1102};
1103
1104/*
1105 * The state of btrfs root
1106 */
1107/*
1108 * btrfs_record_root_in_trans is a multi-step process,
1109 * and it can race with the balancing code. But the
1110 * race is very small, and only the first time the root
1111 * is added to each transaction. So IN_TRANS_SETUP
1112 * is used to tell us when more checks are required
1113 */
1114#define BTRFS_ROOT_IN_TRANS_SETUP 0
1115#define BTRFS_ROOT_REF_COWS 1
1116#define BTRFS_ROOT_TRACK_DIRTY 2
1117#define BTRFS_ROOT_IN_RADIX 3
1118#define BTRFS_ROOT_ORPHAN_ITEM_INSERTED 4
1119#define BTRFS_ROOT_DEFRAG_RUNNING 5
1120#define BTRFS_ROOT_FORCE_COW 6
1121#define BTRFS_ROOT_MULTI_LOG_TASKS 7
1122#define BTRFS_ROOT_DIRTY 8
1123
1124/*
1125 * in ram representation of the tree. extent_root is used for all allocations
1126 * and for the extent tree extent_root root.
1127 */
1128struct btrfs_root {
1129 struct extent_buffer *node;
1130
1131 struct extent_buffer *commit_root;
1132 struct btrfs_root *log_root;
1133 struct btrfs_root *reloc_root;
1134
1135 unsigned long state;
1136 struct btrfs_root_item root_item;
1137 struct btrfs_key root_key;
1138 struct btrfs_fs_info *fs_info;
1139 struct extent_io_tree dirty_log_pages;
1140
1141 struct mutex objectid_mutex;
1142
1143 spinlock_t accounting_lock;
1144 struct btrfs_block_rsv *block_rsv;
1145
1146 /* free ino cache stuff */
1147 struct btrfs_free_space_ctl *free_ino_ctl;
1148 enum btrfs_caching_type ino_cache_state;
1149 spinlock_t ino_cache_lock;
1150 wait_queue_head_t ino_cache_wait;
1151 struct btrfs_free_space_ctl *free_ino_pinned;
1152 u64 ino_cache_progress;
1153 struct inode *ino_cache_inode;
1154
1155 struct mutex log_mutex;
1156 wait_queue_head_t log_writer_wait;
1157 wait_queue_head_t log_commit_wait[2];
1158 struct list_head log_ctxs[2];
1159 atomic_t log_writers;
1160 atomic_t log_commit[2];
1161 atomic_t log_batch;
1162 int log_transid;
1163 /* No matter the commit succeeds or not*/
1164 int log_transid_committed;
1165 /* Just be updated when the commit succeeds. */
1166 int last_log_commit;
1167 pid_t log_start_pid;
1168
1169 u64 objectid;
1170 u64 last_trans;
1171
1172 u32 type;
1173
1174 u64 highest_objectid;
1175
1176#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
1177 /* only used with CONFIG_BTRFS_FS_RUN_SANITY_TESTS is enabled */
1178 u64 alloc_bytenr;
1179#endif
1180
1181 u64 defrag_trans_start;
1182 struct btrfs_key defrag_progress;
1183 struct btrfs_key defrag_max;
1184 char *name;
1185
1186 /* the dirty list is only used by non-reference counted roots */
1187 struct list_head dirty_list;
1188
1189 struct list_head root_list;
1190
1191 spinlock_t log_extents_lock[2];
1192 struct list_head logged_list[2];
1193
1194 spinlock_t orphan_lock;
1195 atomic_t orphan_inodes;
1196 struct btrfs_block_rsv *orphan_block_rsv;
1197 int orphan_cleanup_state;
1198
1199 spinlock_t inode_lock;
1200 /* red-black tree that keeps track of in-memory inodes */
1201 struct rb_root inode_tree;
1202
1203 /*
1204 * radix tree that keeps track of delayed nodes of every inode,
1205 * protected by inode_lock
1206 */
1207 struct radix_tree_root delayed_nodes_tree;
1208 /*
1209 * right now this just gets used so that a root has its own devid
1210 * for stat. It may be used for more later
1211 */
1212 dev_t anon_dev;
1213
1214 spinlock_t root_item_lock;
1215 atomic_t refs;
1216
1217 struct mutex delalloc_mutex;
1218 spinlock_t delalloc_lock;
1219 /*
1220 * all of the inodes that have delalloc bytes. It is possible for
1221 * this list to be empty even when there is still dirty data=ordered
1222 * extents waiting to finish IO.
1223 */
1224 struct list_head delalloc_inodes;
1225 struct list_head delalloc_root;
1226 u64 nr_delalloc_inodes;
1227
1228 struct mutex ordered_extent_mutex;
1229 /*
1230 * this is used by the balancing code to wait for all the pending
1231 * ordered extents
1232 */
1233 spinlock_t ordered_extent_lock;
1234
1235 /*
1236 * all of the data=ordered extents pending writeback
1237 * these can span multiple transactions and basically include
1238 * every dirty data page that isn't from nodatacow
1239 */
1240 struct list_head ordered_extents;
1241 struct list_head ordered_root;
1242 u64 nr_ordered_extents;
1243
1244 /*
1245 * Number of currently running SEND ioctls to prevent
1246 * manipulation with the read-only status via SUBVOL_SETFLAGS
1247 */
1248 int send_in_progress;
1249 struct btrfs_subvolume_writers *subv_writers;
1250 atomic_t will_be_snapshoted;
1251
1252 /* For qgroup metadata space reserve */
1253 atomic_t qgroup_meta_rsv;
1254};
1255static inline u32 btrfs_inode_sectorsize(const struct inode *inode)
1256{
1257 return btrfs_sb(inode->i_sb)->sectorsize;
1258}
1259
1260static inline u32 __BTRFS_LEAF_DATA_SIZE(u32 blocksize)
1261{
1262 return blocksize - sizeof(struct btrfs_header);
1263}
1264
1265static inline u32 BTRFS_LEAF_DATA_SIZE(const struct btrfs_fs_info *info)
1266{
1267 return __BTRFS_LEAF_DATA_SIZE(info->nodesize);
1268}
1269
1270static inline u32 BTRFS_MAX_ITEM_SIZE(const struct btrfs_fs_info *info)
1271{
1272 return BTRFS_LEAF_DATA_SIZE(info) - sizeof(struct btrfs_item);
1273}
1274
1275static inline u32 BTRFS_NODEPTRS_PER_BLOCK(const struct btrfs_fs_info *info)
1276{
1277 return BTRFS_LEAF_DATA_SIZE(info) / sizeof(struct btrfs_key_ptr);
1278}
1279
1280#define BTRFS_FILE_EXTENT_INLINE_DATA_START \
1281 (offsetof(struct btrfs_file_extent_item, disk_bytenr))
1282static inline u32 BTRFS_MAX_INLINE_DATA_SIZE(const struct btrfs_fs_info *info)
1283{
1284 return BTRFS_MAX_ITEM_SIZE(info) -
1285 BTRFS_FILE_EXTENT_INLINE_DATA_START;
1286}
1287
1288static inline u32 BTRFS_MAX_XATTR_SIZE(const struct btrfs_fs_info *info)
1289{
1290 return BTRFS_MAX_ITEM_SIZE(info) - sizeof(struct btrfs_dir_item);
1291}
1292
1293/*
1294 * Flags for mount options.
1295 *
1296 * Note: don't forget to add new options to btrfs_show_options()
1297 */
1298#define BTRFS_MOUNT_NODATASUM (1 << 0)
1299#define BTRFS_MOUNT_NODATACOW (1 << 1)
1300#define BTRFS_MOUNT_NOBARRIER (1 << 2)
1301#define BTRFS_MOUNT_SSD (1 << 3)
1302#define BTRFS_MOUNT_DEGRADED (1 << 4)
1303#define BTRFS_MOUNT_COMPRESS (1 << 5)
1304#define BTRFS_MOUNT_NOTREELOG (1 << 6)
1305#define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1306#define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1307#define BTRFS_MOUNT_NOSSD (1 << 9)
1308#define BTRFS_MOUNT_DISCARD (1 << 10)
1309#define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1310#define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
1311#define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
1312#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1313#define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
1314#define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
1315#define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
1316#define BTRFS_MOUNT_USEBACKUPROOT (1 << 18)
1317#define BTRFS_MOUNT_SKIP_BALANCE (1 << 19)
1318#define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20)
1319#define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21)
1320#define BTRFS_MOUNT_PANIC_ON_FATAL_ERROR (1 << 22)
1321#define BTRFS_MOUNT_RESCAN_UUID_TREE (1 << 23)
1322#define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24)
1323#define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25)
1324#define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26)
1325#define BTRFS_MOUNT_NOLOGREPLAY (1 << 27)
1326
1327#define BTRFS_DEFAULT_COMMIT_INTERVAL (30)
1328#define BTRFS_DEFAULT_MAX_INLINE (2048)
1329
1330#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1331#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1332#define btrfs_raw_test_opt(o, opt) ((o) & BTRFS_MOUNT_##opt)
1333#define btrfs_test_opt(fs_info, opt) ((fs_info)->mount_opt & \
1334 BTRFS_MOUNT_##opt)
1335
1336#define btrfs_set_and_info(fs_info, opt, fmt, args...) \
1337{ \
1338 if (!btrfs_test_opt(fs_info, opt)) \
1339 btrfs_info(fs_info, fmt, ##args); \
1340 btrfs_set_opt(fs_info->mount_opt, opt); \
1341}
1342
1343#define btrfs_clear_and_info(fs_info, opt, fmt, args...) \
1344{ \
1345 if (btrfs_test_opt(fs_info, opt)) \
1346 btrfs_info(fs_info, fmt, ##args); \
1347 btrfs_clear_opt(fs_info->mount_opt, opt); \
1348}
1349
1350#ifdef CONFIG_BTRFS_DEBUG
1351static inline int
1352btrfs_should_fragment_free_space(struct btrfs_block_group_cache *block_group)
1353{
1354 struct btrfs_fs_info *fs_info = block_group->fs_info;
1355
1356 return (btrfs_test_opt(fs_info, FRAGMENT_METADATA) &&
1357 block_group->flags & BTRFS_BLOCK_GROUP_METADATA) ||
1358 (btrfs_test_opt(fs_info, FRAGMENT_DATA) &&
1359 block_group->flags & BTRFS_BLOCK_GROUP_DATA);
1360}
1361#endif
1362
1363/*
1364 * Requests for changes that need to be done during transaction commit.
1365 *
1366 * Internal mount options that are used for special handling of the real
1367 * mount options (eg. cannot be set during remount and have to be set during
1368 * transaction commit)
1369 */
1370
1371#define BTRFS_PENDING_SET_INODE_MAP_CACHE (0)
1372#define BTRFS_PENDING_CLEAR_INODE_MAP_CACHE (1)
1373#define BTRFS_PENDING_COMMIT (2)
1374
1375#define btrfs_test_pending(info, opt) \
1376 test_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1377#define btrfs_set_pending(info, opt) \
1378 set_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1379#define btrfs_clear_pending(info, opt) \
1380 clear_bit(BTRFS_PENDING_##opt, &(info)->pending_changes)
1381
1382/*
1383 * Helpers for setting pending mount option changes.
1384 *
1385 * Expects corresponding macros
1386 * BTRFS_PENDING_SET_ and CLEAR_ + short mount option name
1387 */
1388#define btrfs_set_pending_and_info(info, opt, fmt, args...) \
1389do { \
1390 if (!btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1391 btrfs_info((info), fmt, ##args); \
1392 btrfs_set_pending((info), SET_##opt); \
1393 btrfs_clear_pending((info), CLEAR_##opt); \
1394 } \
1395} while(0)
1396
1397#define btrfs_clear_pending_and_info(info, opt, fmt, args...) \
1398do { \
1399 if (btrfs_raw_test_opt((info)->mount_opt, opt)) { \
1400 btrfs_info((info), fmt, ##args); \
1401 btrfs_set_pending((info), CLEAR_##opt); \
1402 btrfs_clear_pending((info), SET_##opt); \
1403 } \
1404} while(0)
1405
1406/*
1407 * Inode flags
1408 */
1409#define BTRFS_INODE_NODATASUM (1 << 0)
1410#define BTRFS_INODE_NODATACOW (1 << 1)
1411#define BTRFS_INODE_READONLY (1 << 2)
1412#define BTRFS_INODE_NOCOMPRESS (1 << 3)
1413#define BTRFS_INODE_PREALLOC (1 << 4)
1414#define BTRFS_INODE_SYNC (1 << 5)
1415#define BTRFS_INODE_IMMUTABLE (1 << 6)
1416#define BTRFS_INODE_APPEND (1 << 7)
1417#define BTRFS_INODE_NODUMP (1 << 8)
1418#define BTRFS_INODE_NOATIME (1 << 9)
1419#define BTRFS_INODE_DIRSYNC (1 << 10)
1420#define BTRFS_INODE_COMPRESS (1 << 11)
1421
1422#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1423
1424struct btrfs_map_token {
1425 struct extent_buffer *eb;
1426 char *kaddr;
1427 unsigned long offset;
1428};
1429
1430#define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \
1431 ((bytes) >> (fs_info)->sb->s_blocksize_bits)
1432
1433static inline void btrfs_init_map_token (struct btrfs_map_token *token)
1434{
1435 token->kaddr = NULL;
1436}
1437
1438/* some macros to generate set/get functions for the struct fields. This
1439 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1440 * one for u8:
1441 */
1442#define le8_to_cpu(v) (v)
1443#define cpu_to_le8(v) (v)
1444#define __le8 u8
1445
1446#define read_eb_member(eb, ptr, type, member, result) (\
1447 read_extent_buffer(eb, (char *)(result), \
1448 ((unsigned long)(ptr)) + \
1449 offsetof(type, member), \
1450 sizeof(((type *)0)->member)))
1451
1452#define write_eb_member(eb, ptr, type, member, result) (\
1453 write_extent_buffer(eb, (char *)(result), \
1454 ((unsigned long)(ptr)) + \
1455 offsetof(type, member), \
1456 sizeof(((type *)0)->member)))
1457
1458#define DECLARE_BTRFS_SETGET_BITS(bits) \
1459u##bits btrfs_get_token_##bits(struct extent_buffer *eb, void *ptr, \
1460 unsigned long off, \
1461 struct btrfs_map_token *token); \
1462void btrfs_set_token_##bits(struct extent_buffer *eb, void *ptr, \
1463 unsigned long off, u##bits val, \
1464 struct btrfs_map_token *token); \
1465static inline u##bits btrfs_get_##bits(struct extent_buffer *eb, void *ptr, \
1466 unsigned long off) \
1467{ \
1468 return btrfs_get_token_##bits(eb, ptr, off, NULL); \
1469} \
1470static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \
1471 unsigned long off, u##bits val) \
1472{ \
1473 btrfs_set_token_##bits(eb, ptr, off, val, NULL); \
1474}
1475
1476DECLARE_BTRFS_SETGET_BITS(8)
1477DECLARE_BTRFS_SETGET_BITS(16)
1478DECLARE_BTRFS_SETGET_BITS(32)
1479DECLARE_BTRFS_SETGET_BITS(64)
1480
1481#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1482static inline u##bits btrfs_##name(struct extent_buffer *eb, type *s) \
1483{ \
1484 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1485 return btrfs_get_##bits(eb, s, offsetof(type, member)); \
1486} \
1487static inline void btrfs_set_##name(struct extent_buffer *eb, type *s, \
1488 u##bits val) \
1489{ \
1490 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1491 btrfs_set_##bits(eb, s, offsetof(type, member), val); \
1492} \
1493static inline u##bits btrfs_token_##name(struct extent_buffer *eb, type *s, \
1494 struct btrfs_map_token *token) \
1495{ \
1496 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1497 return btrfs_get_token_##bits(eb, s, offsetof(type, member), token); \
1498} \
1499static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
1500 type *s, u##bits val, \
1501 struct btrfs_map_token *token) \
1502{ \
1503 BUILD_BUG_ON(sizeof(u##bits) != sizeof(((type *)0))->member); \
1504 btrfs_set_token_##bits(eb, s, offsetof(type, member), val, token); \
1505}
1506
1507#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1508static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1509{ \
1510 type *p = page_address(eb->pages[0]); \
1511 u##bits res = le##bits##_to_cpu(p->member); \
1512 return res; \
1513} \
1514static inline void btrfs_set_##name(struct extent_buffer *eb, \
1515 u##bits val) \
1516{ \
1517 type *p = page_address(eb->pages[0]); \
1518 p->member = cpu_to_le##bits(val); \
1519}
1520
1521#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1522static inline u##bits btrfs_##name(type *s) \
1523{ \
1524 return le##bits##_to_cpu(s->member); \
1525} \
1526static inline void btrfs_set_##name(type *s, u##bits val) \
1527{ \
1528 s->member = cpu_to_le##bits(val); \
1529}
1530
1531BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1532BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1533BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1534BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1535BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1536BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1537 start_offset, 64);
1538BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1539BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1540BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1541BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1542BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1543BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1544
1545BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1546BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1547 total_bytes, 64);
1548BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1549 bytes_used, 64);
1550BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1551 io_align, 32);
1552BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1553 io_width, 32);
1554BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1555 sector_size, 32);
1556BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1557BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1558 dev_group, 32);
1559BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1560 seek_speed, 8);
1561BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1562 bandwidth, 8);
1563BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1564 generation, 64);
1565
1566static inline unsigned long btrfs_device_uuid(struct btrfs_dev_item *d)
1567{
1568 return (unsigned long)d + offsetof(struct btrfs_dev_item, uuid);
1569}
1570
1571static inline unsigned long btrfs_device_fsid(struct btrfs_dev_item *d)
1572{
1573 return (unsigned long)d + offsetof(struct btrfs_dev_item, fsid);
1574}
1575
1576BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1577BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1578BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1579BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1580BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1581BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1582BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1583BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1584BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1585BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1586BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1587
1588static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1589{
1590 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1591}
1592
1593BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1594BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1595BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1596 stripe_len, 64);
1597BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1598 io_align, 32);
1599BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1600 io_width, 32);
1601BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1602 sector_size, 32);
1603BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1604BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1605 num_stripes, 16);
1606BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1607 sub_stripes, 16);
1608BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1609BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1610
1611static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1612 int nr)
1613{
1614 unsigned long offset = (unsigned long)c;
1615 offset += offsetof(struct btrfs_chunk, stripe);
1616 offset += nr * sizeof(struct btrfs_stripe);
1617 return (struct btrfs_stripe *)offset;
1618}
1619
1620static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1621{
1622 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1623}
1624
1625static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1626 struct btrfs_chunk *c, int nr)
1627{
1628 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1629}
1630
1631static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1632 struct btrfs_chunk *c, int nr)
1633{
1634 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1635}
1636
1637/* struct btrfs_block_group_item */
1638BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1639 used, 64);
1640BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1641 used, 64);
1642BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1643 struct btrfs_block_group_item, chunk_objectid, 64);
1644
1645BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1646 struct btrfs_block_group_item, chunk_objectid, 64);
1647BTRFS_SETGET_FUNCS(disk_block_group_flags,
1648 struct btrfs_block_group_item, flags, 64);
1649BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1650 struct btrfs_block_group_item, flags, 64);
1651
1652/* struct btrfs_free_space_info */
1653BTRFS_SETGET_FUNCS(free_space_extent_count, struct btrfs_free_space_info,
1654 extent_count, 32);
1655BTRFS_SETGET_FUNCS(free_space_flags, struct btrfs_free_space_info, flags, 32);
1656
1657/* struct btrfs_inode_ref */
1658BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1659BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1660
1661/* struct btrfs_inode_extref */
1662BTRFS_SETGET_FUNCS(inode_extref_parent, struct btrfs_inode_extref,
1663 parent_objectid, 64);
1664BTRFS_SETGET_FUNCS(inode_extref_name_len, struct btrfs_inode_extref,
1665 name_len, 16);
1666BTRFS_SETGET_FUNCS(inode_extref_index, struct btrfs_inode_extref, index, 64);
1667
1668/* struct btrfs_inode_item */
1669BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1670BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1671BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1672BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1673BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1674BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1675BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1676BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1677BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1678BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1679BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1680BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1681BTRFS_SETGET_STACK_FUNCS(stack_inode_generation, struct btrfs_inode_item,
1682 generation, 64);
1683BTRFS_SETGET_STACK_FUNCS(stack_inode_sequence, struct btrfs_inode_item,
1684 sequence, 64);
1685BTRFS_SETGET_STACK_FUNCS(stack_inode_transid, struct btrfs_inode_item,
1686 transid, 64);
1687BTRFS_SETGET_STACK_FUNCS(stack_inode_size, struct btrfs_inode_item, size, 64);
1688BTRFS_SETGET_STACK_FUNCS(stack_inode_nbytes, struct btrfs_inode_item,
1689 nbytes, 64);
1690BTRFS_SETGET_STACK_FUNCS(stack_inode_block_group, struct btrfs_inode_item,
1691 block_group, 64);
1692BTRFS_SETGET_STACK_FUNCS(stack_inode_nlink, struct btrfs_inode_item, nlink, 32);
1693BTRFS_SETGET_STACK_FUNCS(stack_inode_uid, struct btrfs_inode_item, uid, 32);
1694BTRFS_SETGET_STACK_FUNCS(stack_inode_gid, struct btrfs_inode_item, gid, 32);
1695BTRFS_SETGET_STACK_FUNCS(stack_inode_mode, struct btrfs_inode_item, mode, 32);
1696BTRFS_SETGET_STACK_FUNCS(stack_inode_rdev, struct btrfs_inode_item, rdev, 64);
1697BTRFS_SETGET_STACK_FUNCS(stack_inode_flags, struct btrfs_inode_item, flags, 64);
1698BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1699BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1700BTRFS_SETGET_STACK_FUNCS(stack_timespec_sec, struct btrfs_timespec, sec, 64);
1701BTRFS_SETGET_STACK_FUNCS(stack_timespec_nsec, struct btrfs_timespec, nsec, 32);
1702
1703/* struct btrfs_dev_extent */
1704BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1705 chunk_tree, 64);
1706BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1707 chunk_objectid, 64);
1708BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1709 chunk_offset, 64);
1710BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1711
1712static inline unsigned long btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1713{
1714 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1715 return (unsigned long)dev + ptr;
1716}
1717
1718BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1719BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1720 generation, 64);
1721BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1722
1723BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1724
1725
1726BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1727
1728static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1729 struct btrfs_tree_block_info *item,
1730 struct btrfs_disk_key *key)
1731{
1732 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1733}
1734
1735static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1736 struct btrfs_tree_block_info *item,
1737 struct btrfs_disk_key *key)
1738{
1739 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1740}
1741
1742BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1743 root, 64);
1744BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1745 objectid, 64);
1746BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1747 offset, 64);
1748BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1749 count, 32);
1750
1751BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1752 count, 32);
1753
1754BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1755 type, 8);
1756BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1757 offset, 64);
1758
1759static inline u32 btrfs_extent_inline_ref_size(int type)
1760{
1761 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1762 type == BTRFS_SHARED_BLOCK_REF_KEY)
1763 return sizeof(struct btrfs_extent_inline_ref);
1764 if (type == BTRFS_SHARED_DATA_REF_KEY)
1765 return sizeof(struct btrfs_shared_data_ref) +
1766 sizeof(struct btrfs_extent_inline_ref);
1767 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1768 return sizeof(struct btrfs_extent_data_ref) +
1769 offsetof(struct btrfs_extent_inline_ref, offset);
1770 BUG();
1771 return 0;
1772}
1773
1774BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1775BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1776 generation, 64);
1777BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1778BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1779
1780/* struct btrfs_node */
1781BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1782BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1783BTRFS_SETGET_STACK_FUNCS(stack_key_blockptr, struct btrfs_key_ptr,
1784 blockptr, 64);
1785BTRFS_SETGET_STACK_FUNCS(stack_key_generation, struct btrfs_key_ptr,
1786 generation, 64);
1787
1788static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1789{
1790 unsigned long ptr;
1791 ptr = offsetof(struct btrfs_node, ptrs) +
1792 sizeof(struct btrfs_key_ptr) * nr;
1793 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1794}
1795
1796static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1797 int nr, u64 val)
1798{
1799 unsigned long ptr;
1800 ptr = offsetof(struct btrfs_node, ptrs) +
1801 sizeof(struct btrfs_key_ptr) * nr;
1802 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1803}
1804
1805static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1806{
1807 unsigned long ptr;
1808 ptr = offsetof(struct btrfs_node, ptrs) +
1809 sizeof(struct btrfs_key_ptr) * nr;
1810 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1811}
1812
1813static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1814 int nr, u64 val)
1815{
1816 unsigned long ptr;
1817 ptr = offsetof(struct btrfs_node, ptrs) +
1818 sizeof(struct btrfs_key_ptr) * nr;
1819 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1820}
1821
1822static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1823{
1824 return offsetof(struct btrfs_node, ptrs) +
1825 sizeof(struct btrfs_key_ptr) * nr;
1826}
1827
1828void btrfs_node_key(struct extent_buffer *eb,
1829 struct btrfs_disk_key *disk_key, int nr);
1830
1831static inline void btrfs_set_node_key(struct extent_buffer *eb,
1832 struct btrfs_disk_key *disk_key, int nr)
1833{
1834 unsigned long ptr;
1835 ptr = btrfs_node_key_ptr_offset(nr);
1836 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1837 struct btrfs_key_ptr, key, disk_key);
1838}
1839
1840/* struct btrfs_item */
1841BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1842BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1843BTRFS_SETGET_STACK_FUNCS(stack_item_offset, struct btrfs_item, offset, 32);
1844BTRFS_SETGET_STACK_FUNCS(stack_item_size, struct btrfs_item, size, 32);
1845
1846static inline unsigned long btrfs_item_nr_offset(int nr)
1847{
1848 return offsetof(struct btrfs_leaf, items) +
1849 sizeof(struct btrfs_item) * nr;
1850}
1851
1852static inline struct btrfs_item *btrfs_item_nr(int nr)
1853{
1854 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1855}
1856
1857static inline u32 btrfs_item_end(struct extent_buffer *eb,
1858 struct btrfs_item *item)
1859{
1860 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1861}
1862
1863static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1864{
1865 return btrfs_item_end(eb, btrfs_item_nr(nr));
1866}
1867
1868static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1869{
1870 return btrfs_item_offset(eb, btrfs_item_nr(nr));
1871}
1872
1873static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1874{
1875 return btrfs_item_size(eb, btrfs_item_nr(nr));
1876}
1877
1878static inline void btrfs_item_key(struct extent_buffer *eb,
1879 struct btrfs_disk_key *disk_key, int nr)
1880{
1881 struct btrfs_item *item = btrfs_item_nr(nr);
1882 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1883}
1884
1885static inline void btrfs_set_item_key(struct extent_buffer *eb,
1886 struct btrfs_disk_key *disk_key, int nr)
1887{
1888 struct btrfs_item *item = btrfs_item_nr(nr);
1889 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1890}
1891
1892BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1893
1894/*
1895 * struct btrfs_root_ref
1896 */
1897BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1898BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1899BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1900
1901/* struct btrfs_dir_item */
1902BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1903BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1904BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1905BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1906BTRFS_SETGET_STACK_FUNCS(stack_dir_type, struct btrfs_dir_item, type, 8);
1907BTRFS_SETGET_STACK_FUNCS(stack_dir_data_len, struct btrfs_dir_item,
1908 data_len, 16);
1909BTRFS_SETGET_STACK_FUNCS(stack_dir_name_len, struct btrfs_dir_item,
1910 name_len, 16);
1911BTRFS_SETGET_STACK_FUNCS(stack_dir_transid, struct btrfs_dir_item,
1912 transid, 64);
1913
1914static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1915 struct btrfs_dir_item *item,
1916 struct btrfs_disk_key *key)
1917{
1918 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1919}
1920
1921static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1922 struct btrfs_dir_item *item,
1923 struct btrfs_disk_key *key)
1924{
1925 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1926}
1927
1928BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1929 num_entries, 64);
1930BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1931 num_bitmaps, 64);
1932BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1933 generation, 64);
1934
1935static inline void btrfs_free_space_key(struct extent_buffer *eb,
1936 struct btrfs_free_space_header *h,
1937 struct btrfs_disk_key *key)
1938{
1939 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1940}
1941
1942static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1943 struct btrfs_free_space_header *h,
1944 struct btrfs_disk_key *key)
1945{
1946 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1947}
1948
1949/* struct btrfs_disk_key */
1950BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1951 objectid, 64);
1952BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1953BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1954
1955static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1956 struct btrfs_disk_key *disk)
1957{
1958 cpu->offset = le64_to_cpu(disk->offset);
1959 cpu->type = disk->type;
1960 cpu->objectid = le64_to_cpu(disk->objectid);
1961}
1962
1963static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1964 struct btrfs_key *cpu)
1965{
1966 disk->offset = cpu_to_le64(cpu->offset);
1967 disk->type = cpu->type;
1968 disk->objectid = cpu_to_le64(cpu->objectid);
1969}
1970
1971static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1972 struct btrfs_key *key, int nr)
1973{
1974 struct btrfs_disk_key disk_key;
1975 btrfs_node_key(eb, &disk_key, nr);
1976 btrfs_disk_key_to_cpu(key, &disk_key);
1977}
1978
1979static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1980 struct btrfs_key *key, int nr)
1981{
1982 struct btrfs_disk_key disk_key;
1983 btrfs_item_key(eb, &disk_key, nr);
1984 btrfs_disk_key_to_cpu(key, &disk_key);
1985}
1986
1987static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1988 struct btrfs_dir_item *item,
1989 struct btrfs_key *key)
1990{
1991 struct btrfs_disk_key disk_key;
1992 btrfs_dir_item_key(eb, item, &disk_key);
1993 btrfs_disk_key_to_cpu(key, &disk_key);
1994}
1995
1996
1997static inline u8 btrfs_key_type(struct btrfs_key *key)
1998{
1999 return key->type;
2000}
2001
2002static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
2003{
2004 key->type = val;
2005}
2006
2007/* struct btrfs_header */
2008BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
2009BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
2010 generation, 64);
2011BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
2012BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
2013BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
2014BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
2015BTRFS_SETGET_STACK_FUNCS(stack_header_generation, struct btrfs_header,
2016 generation, 64);
2017BTRFS_SETGET_STACK_FUNCS(stack_header_owner, struct btrfs_header, owner, 64);
2018BTRFS_SETGET_STACK_FUNCS(stack_header_nritems, struct btrfs_header,
2019 nritems, 32);
2020BTRFS_SETGET_STACK_FUNCS(stack_header_bytenr, struct btrfs_header, bytenr, 64);
2021
2022static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
2023{
2024 return (btrfs_header_flags(eb) & flag) == flag;
2025}
2026
2027static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
2028{
2029 u64 flags = btrfs_header_flags(eb);
2030 btrfs_set_header_flags(eb, flags | flag);
2031 return (flags & flag) == flag;
2032}
2033
2034static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
2035{
2036 u64 flags = btrfs_header_flags(eb);
2037 btrfs_set_header_flags(eb, flags & ~flag);
2038 return (flags & flag) == flag;
2039}
2040
2041static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
2042{
2043 u64 flags = btrfs_header_flags(eb);
2044 return flags >> BTRFS_BACKREF_REV_SHIFT;
2045}
2046
2047static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
2048 int rev)
2049{
2050 u64 flags = btrfs_header_flags(eb);
2051 flags &= ~BTRFS_BACKREF_REV_MASK;
2052 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
2053 btrfs_set_header_flags(eb, flags);
2054}
2055
2056static inline unsigned long btrfs_header_fsid(void)
2057{
2058 return offsetof(struct btrfs_header, fsid);
2059}
2060
2061static inline unsigned long btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
2062{
2063 return offsetof(struct btrfs_header, chunk_tree_uuid);
2064}
2065
2066static inline int btrfs_is_leaf(struct extent_buffer *eb)
2067{
2068 return btrfs_header_level(eb) == 0;
2069}
2070
2071/* struct btrfs_root_item */
2072BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
2073 generation, 64);
2074BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
2075BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
2076BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
2077
2078BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
2079 generation, 64);
2080BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
2081BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
2082BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
2083BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
2084BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
2085BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
2086BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
2087BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
2088 last_snapshot, 64);
2089BTRFS_SETGET_STACK_FUNCS(root_generation_v2, struct btrfs_root_item,
2090 generation_v2, 64);
2091BTRFS_SETGET_STACK_FUNCS(root_ctransid, struct btrfs_root_item,
2092 ctransid, 64);
2093BTRFS_SETGET_STACK_FUNCS(root_otransid, struct btrfs_root_item,
2094 otransid, 64);
2095BTRFS_SETGET_STACK_FUNCS(root_stransid, struct btrfs_root_item,
2096 stransid, 64);
2097BTRFS_SETGET_STACK_FUNCS(root_rtransid, struct btrfs_root_item,
2098 rtransid, 64);
2099
2100static inline bool btrfs_root_readonly(struct btrfs_root *root)
2101{
2102 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_RDONLY)) != 0;
2103}
2104
2105static inline bool btrfs_root_dead(struct btrfs_root *root)
2106{
2107 return (root->root_item.flags & cpu_to_le64(BTRFS_ROOT_SUBVOL_DEAD)) != 0;
2108}
2109
2110/* struct btrfs_root_backup */
2111BTRFS_SETGET_STACK_FUNCS(backup_tree_root, struct btrfs_root_backup,
2112 tree_root, 64);
2113BTRFS_SETGET_STACK_FUNCS(backup_tree_root_gen, struct btrfs_root_backup,
2114 tree_root_gen, 64);
2115BTRFS_SETGET_STACK_FUNCS(backup_tree_root_level, struct btrfs_root_backup,
2116 tree_root_level, 8);
2117
2118BTRFS_SETGET_STACK_FUNCS(backup_chunk_root, struct btrfs_root_backup,
2119 chunk_root, 64);
2120BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_gen, struct btrfs_root_backup,
2121 chunk_root_gen, 64);
2122BTRFS_SETGET_STACK_FUNCS(backup_chunk_root_level, struct btrfs_root_backup,
2123 chunk_root_level, 8);
2124
2125BTRFS_SETGET_STACK_FUNCS(backup_extent_root, struct btrfs_root_backup,
2126 extent_root, 64);
2127BTRFS_SETGET_STACK_FUNCS(backup_extent_root_gen, struct btrfs_root_backup,
2128 extent_root_gen, 64);
2129BTRFS_SETGET_STACK_FUNCS(backup_extent_root_level, struct btrfs_root_backup,
2130 extent_root_level, 8);
2131
2132BTRFS_SETGET_STACK_FUNCS(backup_fs_root, struct btrfs_root_backup,
2133 fs_root, 64);
2134BTRFS_SETGET_STACK_FUNCS(backup_fs_root_gen, struct btrfs_root_backup,
2135 fs_root_gen, 64);
2136BTRFS_SETGET_STACK_FUNCS(backup_fs_root_level, struct btrfs_root_backup,
2137 fs_root_level, 8);
2138
2139BTRFS_SETGET_STACK_FUNCS(backup_dev_root, struct btrfs_root_backup,
2140 dev_root, 64);
2141BTRFS_SETGET_STACK_FUNCS(backup_dev_root_gen, struct btrfs_root_backup,
2142 dev_root_gen, 64);
2143BTRFS_SETGET_STACK_FUNCS(backup_dev_root_level, struct btrfs_root_backup,
2144 dev_root_level, 8);
2145
2146BTRFS_SETGET_STACK_FUNCS(backup_csum_root, struct btrfs_root_backup,
2147 csum_root, 64);
2148BTRFS_SETGET_STACK_FUNCS(backup_csum_root_gen, struct btrfs_root_backup,
2149 csum_root_gen, 64);
2150BTRFS_SETGET_STACK_FUNCS(backup_csum_root_level, struct btrfs_root_backup,
2151 csum_root_level, 8);
2152BTRFS_SETGET_STACK_FUNCS(backup_total_bytes, struct btrfs_root_backup,
2153 total_bytes, 64);
2154BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
2155 bytes_used, 64);
2156BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
2157 num_devices, 64);
2158
2159/* struct btrfs_balance_item */
2160BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
2161
2162static inline void btrfs_balance_data(struct extent_buffer *eb,
2163 struct btrfs_balance_item *bi,
2164 struct btrfs_disk_balance_args *ba)
2165{
2166 read_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2167}
2168
2169static inline void btrfs_set_balance_data(struct extent_buffer *eb,
2170 struct btrfs_balance_item *bi,
2171 struct btrfs_disk_balance_args *ba)
2172{
2173 write_eb_member(eb, bi, struct btrfs_balance_item, data, ba);
2174}
2175
2176static inline void btrfs_balance_meta(struct extent_buffer *eb,
2177 struct btrfs_balance_item *bi,
2178 struct btrfs_disk_balance_args *ba)
2179{
2180 read_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2181}
2182
2183static inline void btrfs_set_balance_meta(struct extent_buffer *eb,
2184 struct btrfs_balance_item *bi,
2185 struct btrfs_disk_balance_args *ba)
2186{
2187 write_eb_member(eb, bi, struct btrfs_balance_item, meta, ba);
2188}
2189
2190static inline void btrfs_balance_sys(struct extent_buffer *eb,
2191 struct btrfs_balance_item *bi,
2192 struct btrfs_disk_balance_args *ba)
2193{
2194 read_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2195}
2196
2197static inline void btrfs_set_balance_sys(struct extent_buffer *eb,
2198 struct btrfs_balance_item *bi,
2199 struct btrfs_disk_balance_args *ba)
2200{
2201 write_eb_member(eb, bi, struct btrfs_balance_item, sys, ba);
2202}
2203
2204static inline void
2205btrfs_disk_balance_args_to_cpu(struct btrfs_balance_args *cpu,
2206 struct btrfs_disk_balance_args *disk)
2207{
2208 memset(cpu, 0, sizeof(*cpu));
2209
2210 cpu->profiles = le64_to_cpu(disk->profiles);
2211 cpu->usage = le64_to_cpu(disk->usage);
2212 cpu->devid = le64_to_cpu(disk->devid);
2213 cpu->pstart = le64_to_cpu(disk->pstart);
2214 cpu->pend = le64_to_cpu(disk->pend);
2215 cpu->vstart = le64_to_cpu(disk->vstart);
2216 cpu->vend = le64_to_cpu(disk->vend);
2217 cpu->target = le64_to_cpu(disk->target);
2218 cpu->flags = le64_to_cpu(disk->flags);
2219 cpu->limit = le64_to_cpu(disk->limit);
2220 cpu->stripes_min = le32_to_cpu(disk->stripes_min);
2221 cpu->stripes_max = le32_to_cpu(disk->stripes_max);
2222}
2223
2224static inline void
2225btrfs_cpu_balance_args_to_disk(struct btrfs_disk_balance_args *disk,
2226 struct btrfs_balance_args *cpu)
2227{
2228 memset(disk, 0, sizeof(*disk));
2229
2230 disk->profiles = cpu_to_le64(cpu->profiles);
2231 disk->usage = cpu_to_le64(cpu->usage);
2232 disk->devid = cpu_to_le64(cpu->devid);
2233 disk->pstart = cpu_to_le64(cpu->pstart);
2234 disk->pend = cpu_to_le64(cpu->pend);
2235 disk->vstart = cpu_to_le64(cpu->vstart);
2236 disk->vend = cpu_to_le64(cpu->vend);
2237 disk->target = cpu_to_le64(cpu->target);
2238 disk->flags = cpu_to_le64(cpu->flags);
2239 disk->limit = cpu_to_le64(cpu->limit);
2240 disk->stripes_min = cpu_to_le32(cpu->stripes_min);
2241 disk->stripes_max = cpu_to_le32(cpu->stripes_max);
2242}
2243
2244/* struct btrfs_super_block */
2245BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
2246BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
2247BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
2248 generation, 64);
2249BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
2250BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
2251 struct btrfs_super_block, sys_chunk_array_size, 32);
2252BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
2253 struct btrfs_super_block, chunk_root_generation, 64);
2254BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
2255 root_level, 8);
2256BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
2257 chunk_root, 64);
2258BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
2259 chunk_root_level, 8);
2260BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
2261 log_root, 64);
2262BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2263 log_root_transid, 64);
2264BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2265 log_root_level, 8);
2266BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2267 total_bytes, 64);
2268BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2269 bytes_used, 64);
2270BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2271 sectorsize, 32);
2272BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2273 nodesize, 32);
2274BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2275 stripesize, 32);
2276BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2277 root_dir_objectid, 64);
2278BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2279 num_devices, 64);
2280BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2281 compat_flags, 64);
2282BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2283 compat_ro_flags, 64);
2284BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2285 incompat_flags, 64);
2286BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2287 csum_type, 16);
2288BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2289 cache_generation, 64);
2290BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
2291BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
2292 uuid_tree_generation, 64);
2293
2294static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2295{
2296 u16 t = btrfs_super_csum_type(s);
2297 /*
2298 * csum type is validated at mount time
2299 */
2300 return btrfs_csum_sizes[t];
2301}
2302
2303static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2304{
2305 return offsetof(struct btrfs_leaf, items);
2306}
2307
2308/*
2309 * The leaf data grows from end-to-front in the node.
2310 * this returns the address of the start of the last item,
2311 * which is the stop of the leaf data stack
2312 */
2313static inline unsigned int leaf_data_end(struct btrfs_fs_info *fs_info,
2314 struct extent_buffer *leaf)
2315{
2316 u32 nr = btrfs_header_nritems(leaf);
2317
2318 if (nr == 0)
2319 return BTRFS_LEAF_DATA_SIZE(fs_info);
2320 return btrfs_item_offset_nr(leaf, nr - 1);
2321}
2322
2323/* struct btrfs_file_extent_item */
2324BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2325BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_bytenr,
2326 struct btrfs_file_extent_item, disk_bytenr, 64);
2327BTRFS_SETGET_STACK_FUNCS(stack_file_extent_offset,
2328 struct btrfs_file_extent_item, offset, 64);
2329BTRFS_SETGET_STACK_FUNCS(stack_file_extent_generation,
2330 struct btrfs_file_extent_item, generation, 64);
2331BTRFS_SETGET_STACK_FUNCS(stack_file_extent_num_bytes,
2332 struct btrfs_file_extent_item, num_bytes, 64);
2333BTRFS_SETGET_STACK_FUNCS(stack_file_extent_disk_num_bytes,
2334 struct btrfs_file_extent_item, disk_num_bytes, 64);
2335BTRFS_SETGET_STACK_FUNCS(stack_file_extent_compression,
2336 struct btrfs_file_extent_item, compression, 8);
2337
2338static inline unsigned long
2339btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2340{
2341 return (unsigned long)e + BTRFS_FILE_EXTENT_INLINE_DATA_START;
2342}
2343
2344static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2345{
2346 return BTRFS_FILE_EXTENT_INLINE_DATA_START + datasize;
2347}
2348
2349BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2350 disk_bytenr, 64);
2351BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2352 generation, 64);
2353BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2354 disk_num_bytes, 64);
2355BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2356 offset, 64);
2357BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2358 num_bytes, 64);
2359BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2360 ram_bytes, 64);
2361BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2362 compression, 8);
2363BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2364 encryption, 8);
2365BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2366 other_encoding, 16);
2367
2368/*
2369 * this returns the number of bytes used by the item on disk, minus the
2370 * size of any extent headers. If a file is compressed on disk, this is
2371 * the compressed size
2372 */
2373static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2374 struct btrfs_item *e)
2375{
2376 return btrfs_item_size(eb, e) - BTRFS_FILE_EXTENT_INLINE_DATA_START;
2377}
2378
2379/* this returns the number of file bytes represented by the inline item.
2380 * If an item is compressed, this is the uncompressed size
2381 */
2382static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2383 int slot,
2384 struct btrfs_file_extent_item *fi)
2385{
2386 struct btrfs_map_token token;
2387
2388 btrfs_init_map_token(&token);
2389 /*
2390 * return the space used on disk if this item isn't
2391 * compressed or encoded
2392 */
2393 if (btrfs_token_file_extent_compression(eb, fi, &token) == 0 &&
2394 btrfs_token_file_extent_encryption(eb, fi, &token) == 0 &&
2395 btrfs_token_file_extent_other_encoding(eb, fi, &token) == 0) {
2396 return btrfs_file_extent_inline_item_len(eb,
2397 btrfs_item_nr(slot));
2398 }
2399
2400 /* otherwise use the ram bytes field */
2401 return btrfs_token_file_extent_ram_bytes(eb, fi, &token);
2402}
2403
2404
2405/* btrfs_dev_stats_item */
2406static inline u64 btrfs_dev_stats_value(struct extent_buffer *eb,
2407 struct btrfs_dev_stats_item *ptr,
2408 int index)
2409{
2410 u64 val;
2411
2412 read_extent_buffer(eb, &val,
2413 offsetof(struct btrfs_dev_stats_item, values) +
2414 ((unsigned long)ptr) + (index * sizeof(u64)),
2415 sizeof(val));
2416 return val;
2417}
2418
2419static inline void btrfs_set_dev_stats_value(struct extent_buffer *eb,
2420 struct btrfs_dev_stats_item *ptr,
2421 int index, u64 val)
2422{
2423 write_extent_buffer(eb, &val,
2424 offsetof(struct btrfs_dev_stats_item, values) +
2425 ((unsigned long)ptr) + (index * sizeof(u64)),
2426 sizeof(val));
2427}
2428
2429/* btrfs_qgroup_status_item */
2430BTRFS_SETGET_FUNCS(qgroup_status_generation, struct btrfs_qgroup_status_item,
2431 generation, 64);
2432BTRFS_SETGET_FUNCS(qgroup_status_version, struct btrfs_qgroup_status_item,
2433 version, 64);
2434BTRFS_SETGET_FUNCS(qgroup_status_flags, struct btrfs_qgroup_status_item,
2435 flags, 64);
2436BTRFS_SETGET_FUNCS(qgroup_status_rescan, struct btrfs_qgroup_status_item,
2437 rescan, 64);
2438
2439/* btrfs_qgroup_info_item */
2440BTRFS_SETGET_FUNCS(qgroup_info_generation, struct btrfs_qgroup_info_item,
2441 generation, 64);
2442BTRFS_SETGET_FUNCS(qgroup_info_rfer, struct btrfs_qgroup_info_item, rfer, 64);
2443BTRFS_SETGET_FUNCS(qgroup_info_rfer_cmpr, struct btrfs_qgroup_info_item,
2444 rfer_cmpr, 64);
2445BTRFS_SETGET_FUNCS(qgroup_info_excl, struct btrfs_qgroup_info_item, excl, 64);
2446BTRFS_SETGET_FUNCS(qgroup_info_excl_cmpr, struct btrfs_qgroup_info_item,
2447 excl_cmpr, 64);
2448
2449BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_generation,
2450 struct btrfs_qgroup_info_item, generation, 64);
2451BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer, struct btrfs_qgroup_info_item,
2452 rfer, 64);
2453BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_rfer_cmpr,
2454 struct btrfs_qgroup_info_item, rfer_cmpr, 64);
2455BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl, struct btrfs_qgroup_info_item,
2456 excl, 64);
2457BTRFS_SETGET_STACK_FUNCS(stack_qgroup_info_excl_cmpr,
2458 struct btrfs_qgroup_info_item, excl_cmpr, 64);
2459
2460/* btrfs_qgroup_limit_item */
2461BTRFS_SETGET_FUNCS(qgroup_limit_flags, struct btrfs_qgroup_limit_item,
2462 flags, 64);
2463BTRFS_SETGET_FUNCS(qgroup_limit_max_rfer, struct btrfs_qgroup_limit_item,
2464 max_rfer, 64);
2465BTRFS_SETGET_FUNCS(qgroup_limit_max_excl, struct btrfs_qgroup_limit_item,
2466 max_excl, 64);
2467BTRFS_SETGET_FUNCS(qgroup_limit_rsv_rfer, struct btrfs_qgroup_limit_item,
2468 rsv_rfer, 64);
2469BTRFS_SETGET_FUNCS(qgroup_limit_rsv_excl, struct btrfs_qgroup_limit_item,
2470 rsv_excl, 64);
2471
2472/* btrfs_dev_replace_item */
2473BTRFS_SETGET_FUNCS(dev_replace_src_devid,
2474 struct btrfs_dev_replace_item, src_devid, 64);
2475BTRFS_SETGET_FUNCS(dev_replace_cont_reading_from_srcdev_mode,
2476 struct btrfs_dev_replace_item, cont_reading_from_srcdev_mode,
2477 64);
2478BTRFS_SETGET_FUNCS(dev_replace_replace_state, struct btrfs_dev_replace_item,
2479 replace_state, 64);
2480BTRFS_SETGET_FUNCS(dev_replace_time_started, struct btrfs_dev_replace_item,
2481 time_started, 64);
2482BTRFS_SETGET_FUNCS(dev_replace_time_stopped, struct btrfs_dev_replace_item,
2483 time_stopped, 64);
2484BTRFS_SETGET_FUNCS(dev_replace_num_write_errors, struct btrfs_dev_replace_item,
2485 num_write_errors, 64);
2486BTRFS_SETGET_FUNCS(dev_replace_num_uncorrectable_read_errors,
2487 struct btrfs_dev_replace_item, num_uncorrectable_read_errors,
2488 64);
2489BTRFS_SETGET_FUNCS(dev_replace_cursor_left, struct btrfs_dev_replace_item,
2490 cursor_left, 64);
2491BTRFS_SETGET_FUNCS(dev_replace_cursor_right, struct btrfs_dev_replace_item,
2492 cursor_right, 64);
2493
2494BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_src_devid,
2495 struct btrfs_dev_replace_item, src_devid, 64);
2496BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cont_reading_from_srcdev_mode,
2497 struct btrfs_dev_replace_item,
2498 cont_reading_from_srcdev_mode, 64);
2499BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_replace_state,
2500 struct btrfs_dev_replace_item, replace_state, 64);
2501BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_started,
2502 struct btrfs_dev_replace_item, time_started, 64);
2503BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_time_stopped,
2504 struct btrfs_dev_replace_item, time_stopped, 64);
2505BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_write_errors,
2506 struct btrfs_dev_replace_item, num_write_errors, 64);
2507BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_num_uncorrectable_read_errors,
2508 struct btrfs_dev_replace_item,
2509 num_uncorrectable_read_errors, 64);
2510BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_left,
2511 struct btrfs_dev_replace_item, cursor_left, 64);
2512BTRFS_SETGET_STACK_FUNCS(stack_dev_replace_cursor_right,
2513 struct btrfs_dev_replace_item, cursor_right, 64);
2514
2515/* helper function to cast into the data area of the leaf. */
2516#define btrfs_item_ptr(leaf, slot, type) \
2517 ((type *)(btrfs_leaf_data(leaf) + \
2518 btrfs_item_offset_nr(leaf, slot)))
2519
2520#define btrfs_item_ptr_offset(leaf, slot) \
2521 ((unsigned long)(btrfs_leaf_data(leaf) + \
2522 btrfs_item_offset_nr(leaf, slot)))
2523
2524static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2525{
2526 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2527 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2528}
2529
2530static inline gfp_t btrfs_alloc_write_mask(struct address_space *mapping)
2531{
2532 return mapping_gfp_constraint(mapping, ~__GFP_FS);
2533}
2534
2535/* extent-tree.c */
2536
2537u64 btrfs_csum_bytes_to_leaves(struct btrfs_fs_info *fs_info, u64 csum_bytes);
2538
2539static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_fs_info *fs_info,
2540 unsigned num_items)
2541{
2542 return fs_info->nodesize * BTRFS_MAX_LEVEL * 2 * num_items;
2543}
2544
2545/*
2546 * Doing a truncate won't result in new nodes or leaves, just what we need for
2547 * COW.
2548 */
2549static inline u64 btrfs_calc_trunc_metadata_size(struct btrfs_fs_info *fs_info,
2550 unsigned num_items)
2551{
2552 return fs_info->nodesize * BTRFS_MAX_LEVEL * num_items;
2553}
2554
2555int btrfs_should_throttle_delayed_refs(struct btrfs_trans_handle *trans,
2556 struct btrfs_fs_info *fs_info);
2557int btrfs_check_space_for_delayed_refs(struct btrfs_trans_handle *trans,
2558 struct btrfs_fs_info *fs_info);
2559void btrfs_dec_block_group_reservations(struct btrfs_fs_info *fs_info,
2560 const u64 start);
2561void btrfs_wait_block_group_reservations(struct btrfs_block_group_cache *bg);
2562bool btrfs_inc_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2563void btrfs_dec_nocow_writers(struct btrfs_fs_info *fs_info, u64 bytenr);
2564void btrfs_wait_nocow_writers(struct btrfs_block_group_cache *bg);
2565void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2566int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2567 struct btrfs_fs_info *fs_info, unsigned long count);
2568int btrfs_async_run_delayed_refs(struct btrfs_fs_info *fs_info,
2569 unsigned long count, u64 transid, int wait);
2570int btrfs_lookup_data_extent(struct btrfs_fs_info *fs_info, u64 start, u64 len);
2571int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2572 struct btrfs_fs_info *fs_info, u64 bytenr,
2573 u64 offset, int metadata, u64 *refs, u64 *flags);
2574int btrfs_pin_extent(struct btrfs_fs_info *fs_info,
2575 u64 bytenr, u64 num, int reserved);
2576int btrfs_pin_extent_for_log_replay(struct btrfs_fs_info *fs_info,
2577 u64 bytenr, u64 num_bytes);
2578int btrfs_exclude_logged_extents(struct btrfs_fs_info *fs_info,
2579 struct extent_buffer *eb);
2580int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2581 struct btrfs_root *root,
2582 u64 objectid, u64 offset, u64 bytenr);
2583struct btrfs_block_group_cache *btrfs_lookup_block_group(
2584 struct btrfs_fs_info *info,
2585 u64 bytenr);
2586void btrfs_get_block_group(struct btrfs_block_group_cache *cache);
2587void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2588int get_block_group_index(struct btrfs_block_group_cache *cache);
2589struct extent_buffer *btrfs_alloc_tree_block(struct btrfs_trans_handle *trans,
2590 struct btrfs_root *root, u64 parent,
2591 u64 root_objectid,
2592 struct btrfs_disk_key *key, int level,
2593 u64 hint, u64 empty_size);
2594void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2595 struct btrfs_root *root,
2596 struct extent_buffer *buf,
2597 u64 parent, int last_ref);
2598int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2599 u64 root_objectid, u64 owner,
2600 u64 offset, u64 ram_bytes,
2601 struct btrfs_key *ins);
2602int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2603 struct btrfs_fs_info *fs_info,
2604 u64 root_objectid, u64 owner, u64 offset,
2605 struct btrfs_key *ins);
2606int btrfs_reserve_extent(struct btrfs_root *root, u64 ram_bytes, u64 num_bytes,
2607 u64 min_alloc_size, u64 empty_size, u64 hint_byte,
2608 struct btrfs_key *ins, int is_data, int delalloc);
2609int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2610 struct extent_buffer *buf, int full_backref);
2611int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2612 struct extent_buffer *buf, int full_backref);
2613int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2614 struct btrfs_fs_info *fs_info,
2615 u64 bytenr, u64 num_bytes, u64 flags,
2616 int level, int is_data);
2617int btrfs_free_extent(struct btrfs_trans_handle *trans,
2618 struct btrfs_fs_info *fs_info,
2619 u64 bytenr, u64 num_bytes, u64 parent, u64 root_objectid,
2620 u64 owner, u64 offset);
2621
2622int btrfs_free_reserved_extent(struct btrfs_fs_info *fs_info,
2623 u64 start, u64 len, int delalloc);
2624int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
2625 u64 start, u64 len);
2626void btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2627 struct btrfs_fs_info *fs_info);
2628int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2629 struct btrfs_fs_info *fs_info);
2630int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2631 struct btrfs_fs_info *fs_info,
2632 u64 bytenr, u64 num_bytes, u64 parent,
2633 u64 root_objectid, u64 owner, u64 offset);
2634
2635int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans,
2636 struct btrfs_fs_info *fs_info);
2637int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2638 struct btrfs_fs_info *fs_info);
2639int btrfs_setup_space_cache(struct btrfs_trans_handle *trans,
2640 struct btrfs_fs_info *fs_info);
2641int btrfs_extent_readonly(struct btrfs_fs_info *fs_info, u64 bytenr);
2642int btrfs_free_block_groups(struct btrfs_fs_info *info);
2643int btrfs_read_block_groups(struct btrfs_fs_info *info);
2644int btrfs_can_relocate(struct btrfs_fs_info *fs_info, u64 bytenr);
2645int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2646 struct btrfs_fs_info *fs_info, u64 bytes_used,
2647 u64 type, u64 chunk_objectid, u64 chunk_offset,
2648 u64 size);
2649struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
2650 struct btrfs_fs_info *fs_info,
2651 const u64 chunk_offset);
2652int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2653 struct btrfs_fs_info *fs_info, u64 group_start,
2654 struct extent_map *em);
2655void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info);
2656void btrfs_get_block_group_trimming(struct btrfs_block_group_cache *cache);
2657void btrfs_put_block_group_trimming(struct btrfs_block_group_cache *cache);
2658void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans,
2659 struct btrfs_fs_info *fs_info);
2660u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
2661void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2662
2663enum btrfs_reserve_flush_enum {
2664 /* If we are in the transaction, we can't flush anything.*/
2665 BTRFS_RESERVE_NO_FLUSH,
2666 /*
2667 * Flushing delalloc may cause deadlock somewhere, in this
2668 * case, use FLUSH LIMIT
2669 */
2670 BTRFS_RESERVE_FLUSH_LIMIT,
2671 BTRFS_RESERVE_FLUSH_ALL,
2672};
2673
2674enum btrfs_flush_state {
2675 FLUSH_DELAYED_ITEMS_NR = 1,
2676 FLUSH_DELAYED_ITEMS = 2,
2677 FLUSH_DELALLOC = 3,
2678 FLUSH_DELALLOC_WAIT = 4,
2679 ALLOC_CHUNK = 5,
2680 COMMIT_TRANS = 6,
2681};
2682
2683int btrfs_check_data_free_space(struct inode *inode, u64 start, u64 len);
2684int btrfs_alloc_data_chunk_ondemand(struct inode *inode, u64 bytes);
2685void btrfs_free_reserved_data_space(struct inode *inode, u64 start, u64 len);
2686void btrfs_free_reserved_data_space_noquota(struct inode *inode, u64 start,
2687 u64 len);
2688void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2689 struct btrfs_fs_info *fs_info);
2690void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
2691int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2692 struct inode *inode);
2693void btrfs_orphan_release_metadata(struct inode *inode);
2694int btrfs_subvolume_reserve_metadata(struct btrfs_root *root,
2695 struct btrfs_block_rsv *rsv,
2696 int nitems,
2697 u64 *qgroup_reserved, bool use_global_rsv);
2698void btrfs_subvolume_release_metadata(struct btrfs_fs_info *fs_info,
2699 struct btrfs_block_rsv *rsv,
2700 u64 qgroup_reserved);
2701int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2702void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2703int btrfs_delalloc_reserve_space(struct inode *inode, u64 start, u64 len);
2704void btrfs_delalloc_release_space(struct inode *inode, u64 start, u64 len);
2705void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv, unsigned short type);
2706struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_fs_info *fs_info,
2707 unsigned short type);
2708void btrfs_free_block_rsv(struct btrfs_fs_info *fs_info,
2709 struct btrfs_block_rsv *rsv);
2710void __btrfs_free_block_rsv(struct btrfs_block_rsv *rsv);
2711int btrfs_block_rsv_add(struct btrfs_root *root,
2712 struct btrfs_block_rsv *block_rsv, u64 num_bytes,
2713 enum btrfs_reserve_flush_enum flush);
2714int btrfs_block_rsv_check(struct btrfs_block_rsv *block_rsv, int min_factor);
2715int btrfs_block_rsv_refill(struct btrfs_root *root,
2716 struct btrfs_block_rsv *block_rsv, u64 min_reserved,
2717 enum btrfs_reserve_flush_enum flush);
2718int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2719 struct btrfs_block_rsv *dst_rsv, u64 num_bytes,
2720 int update_size);
2721int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
2722 struct btrfs_block_rsv *dest, u64 num_bytes,
2723 int min_factor);
2724void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
2725 struct btrfs_block_rsv *block_rsv,
2726 u64 num_bytes);
2727int btrfs_inc_block_group_ro(struct btrfs_root *root,
2728 struct btrfs_block_group_cache *cache);
2729void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
2730void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2731u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2732int btrfs_error_unpin_extent_range(struct btrfs_fs_info *fs_info,
2733 u64 start, u64 end);
2734int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
2735 u64 num_bytes, u64 *actual_bytes);
2736int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2737 struct btrfs_fs_info *fs_info, u64 type);
2738int btrfs_trim_fs(struct btrfs_fs_info *fs_info, struct fstrim_range *range);
2739
2740int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2741int btrfs_delayed_refs_qgroup_accounting(struct btrfs_trans_handle *trans,
2742 struct btrfs_fs_info *fs_info);
2743int __get_raid_index(u64 flags);
2744int btrfs_start_write_no_snapshoting(struct btrfs_root *root);
2745void btrfs_end_write_no_snapshoting(struct btrfs_root *root);
2746void btrfs_wait_for_snapshot_creation(struct btrfs_root *root);
2747void check_system_chunk(struct btrfs_trans_handle *trans,
2748 struct btrfs_fs_info *fs_info, const u64 type);
2749u64 add_new_free_space(struct btrfs_block_group_cache *block_group,
2750 struct btrfs_fs_info *info, u64 start, u64 end);
2751
2752/* ctree.c */
2753int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2754 int level, int *slot);
2755int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2756int btrfs_previous_item(struct btrfs_root *root,
2757 struct btrfs_path *path, u64 min_objectid,
2758 int type);
2759int btrfs_previous_extent_item(struct btrfs_root *root,
2760 struct btrfs_path *path, u64 min_objectid);
2761void btrfs_set_item_key_safe(struct btrfs_fs_info *fs_info,
2762 struct btrfs_path *path,
2763 struct btrfs_key *new_key);
2764struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2765struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2766int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2767 struct btrfs_key *key, int lowest_level,
2768 u64 min_trans);
2769int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2770 struct btrfs_path *path,
2771 u64 min_trans);
2772enum btrfs_compare_tree_result {
2773 BTRFS_COMPARE_TREE_NEW,
2774 BTRFS_COMPARE_TREE_DELETED,
2775 BTRFS_COMPARE_TREE_CHANGED,
2776 BTRFS_COMPARE_TREE_SAME,
2777};
2778typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
2779 struct btrfs_root *right_root,
2780 struct btrfs_path *left_path,
2781 struct btrfs_path *right_path,
2782 struct btrfs_key *key,
2783 enum btrfs_compare_tree_result result,
2784 void *ctx);
2785int btrfs_compare_trees(struct btrfs_root *left_root,
2786 struct btrfs_root *right_root,
2787 btrfs_changed_cb_t cb, void *ctx);
2788int btrfs_cow_block(struct btrfs_trans_handle *trans,
2789 struct btrfs_root *root, struct extent_buffer *buf,
2790 struct extent_buffer *parent, int parent_slot,
2791 struct extent_buffer **cow_ret);
2792int btrfs_copy_root(struct btrfs_trans_handle *trans,
2793 struct btrfs_root *root,
2794 struct extent_buffer *buf,
2795 struct extent_buffer **cow_ret, u64 new_root_objectid);
2796int btrfs_block_can_be_shared(struct btrfs_root *root,
2797 struct extent_buffer *buf);
2798void btrfs_extend_item(struct btrfs_fs_info *fs_info, struct btrfs_path *path,
2799 u32 data_size);
2800void btrfs_truncate_item(struct btrfs_fs_info *fs_info,
2801 struct btrfs_path *path, u32 new_size, int from_end);
2802int btrfs_split_item(struct btrfs_trans_handle *trans,
2803 struct btrfs_root *root,
2804 struct btrfs_path *path,
2805 struct btrfs_key *new_key,
2806 unsigned long split_offset);
2807int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2808 struct btrfs_root *root,
2809 struct btrfs_path *path,
2810 struct btrfs_key *new_key);
2811int btrfs_find_item(struct btrfs_root *fs_root, struct btrfs_path *path,
2812 u64 inum, u64 ioff, u8 key_type, struct btrfs_key *found_key);
2813int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2814 *root, struct btrfs_key *key, struct btrfs_path *p, int
2815 ins_len, int cow);
2816int btrfs_search_old_slot(struct btrfs_root *root, struct btrfs_key *key,
2817 struct btrfs_path *p, u64 time_seq);
2818int btrfs_search_slot_for_read(struct btrfs_root *root,
2819 struct btrfs_key *key, struct btrfs_path *p,
2820 int find_higher, int return_any);
2821int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2822 struct btrfs_root *root, struct extent_buffer *parent,
2823 int start_slot, u64 *last_ret,
2824 struct btrfs_key *progress);
2825void btrfs_release_path(struct btrfs_path *p);
2826struct btrfs_path *btrfs_alloc_path(void);
2827void btrfs_free_path(struct btrfs_path *p);
2828void btrfs_set_path_blocking(struct btrfs_path *p);
2829void btrfs_clear_path_blocking(struct btrfs_path *p,
2830 struct extent_buffer *held, int held_rw);
2831void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2832
2833int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2834 struct btrfs_path *path, int slot, int nr);
2835static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2836 struct btrfs_root *root,
2837 struct btrfs_path *path)
2838{
2839 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2840}
2841
2842void setup_items_for_insert(struct btrfs_root *root, struct btrfs_path *path,
2843 struct btrfs_key *cpu_key, u32 *data_size,
2844 u32 total_data, u32 total_size, int nr);
2845int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2846 *root, struct btrfs_key *key, void *data, u32 data_size);
2847int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2848 struct btrfs_root *root,
2849 struct btrfs_path *path,
2850 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2851
2852static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2853 struct btrfs_root *root,
2854 struct btrfs_path *path,
2855 struct btrfs_key *key,
2856 u32 data_size)
2857{
2858 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2859}
2860
2861int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2862int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2863int btrfs_next_old_leaf(struct btrfs_root *root, struct btrfs_path *path,
2864 u64 time_seq);
2865static inline int btrfs_next_old_item(struct btrfs_root *root,
2866 struct btrfs_path *p, u64 time_seq)
2867{
2868 ++p->slots[0];
2869 if (p->slots[0] >= btrfs_header_nritems(p->nodes[0]))
2870 return btrfs_next_old_leaf(root, p, time_seq);
2871 return 0;
2872}
2873static inline int btrfs_next_item(struct btrfs_root *root, struct btrfs_path *p)
2874{
2875 return btrfs_next_old_item(root, p, 0);
2876}
2877int btrfs_leaf_free_space(struct btrfs_fs_info *fs_info,
2878 struct extent_buffer *leaf);
2879int __must_check btrfs_drop_snapshot(struct btrfs_root *root,
2880 struct btrfs_block_rsv *block_rsv,
2881 int update_ref, int for_reloc);
2882int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2883 struct btrfs_root *root,
2884 struct extent_buffer *node,
2885 struct extent_buffer *parent);
2886static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2887{
2888 /*
2889 * Do it this way so we only ever do one test_bit in the normal case.
2890 */
2891 if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
2892 if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
2893 return 2;
2894 return 1;
2895 }
2896 return 0;
2897}
2898
2899/*
2900 * If we remount the fs to be R/O or umount the fs, the cleaner needn't do
2901 * anything except sleeping. This function is used to check the status of
2902 * the fs.
2903 */
2904static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
2905{
2906 return fs_info->sb->s_flags & MS_RDONLY || btrfs_fs_closing(fs_info);
2907}
2908
2909static inline void free_fs_info(struct btrfs_fs_info *fs_info)
2910{
2911 kfree(fs_info->balance_ctl);
2912 kfree(fs_info->delayed_root);
2913 kfree(fs_info->extent_root);
2914 kfree(fs_info->tree_root);
2915 kfree(fs_info->chunk_root);
2916 kfree(fs_info->dev_root);
2917 kfree(fs_info->csum_root);
2918 kfree(fs_info->quota_root);
2919 kfree(fs_info->uuid_root);
2920 kfree(fs_info->free_space_root);
2921 kfree(fs_info->super_copy);
2922 kfree(fs_info->super_for_commit);
2923 security_free_mnt_opts(&fs_info->security_opts);
2924 kfree(fs_info);
2925}
2926
2927/* tree mod log functions from ctree.c */
2928u64 btrfs_get_tree_mod_seq(struct btrfs_fs_info *fs_info,
2929 struct seq_list *elem);
2930void btrfs_put_tree_mod_seq(struct btrfs_fs_info *fs_info,
2931 struct seq_list *elem);
2932int btrfs_old_root_level(struct btrfs_root *root, u64 time_seq);
2933
2934/* root-item.c */
2935int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2936 struct btrfs_fs_info *fs_info,
2937 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2938 const char *name, int name_len);
2939int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2940 struct btrfs_fs_info *fs_info,
2941 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2942 const char *name, int name_len);
2943int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2944 struct btrfs_key *key);
2945int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2946 *root, struct btrfs_key *key, struct btrfs_root_item
2947 *item);
2948int __must_check btrfs_update_root(struct btrfs_trans_handle *trans,
2949 struct btrfs_root *root,
2950 struct btrfs_key *key,
2951 struct btrfs_root_item *item);
2952int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
2953 struct btrfs_path *path, struct btrfs_root_item *root_item,
2954 struct btrfs_key *root_key);
2955int btrfs_find_orphan_roots(struct btrfs_fs_info *fs_info);
2956void btrfs_set_root_node(struct btrfs_root_item *item,
2957 struct extent_buffer *node);
2958void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2959void btrfs_update_root_times(struct btrfs_trans_handle *trans,
2960 struct btrfs_root *root);
2961
2962/* uuid-tree.c */
2963int btrfs_uuid_tree_add(struct btrfs_trans_handle *trans,
2964 struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
2965 u64 subid);
2966int btrfs_uuid_tree_rem(struct btrfs_trans_handle *trans,
2967 struct btrfs_fs_info *fs_info, u8 *uuid, u8 type,
2968 u64 subid);
2969int btrfs_uuid_tree_iterate(struct btrfs_fs_info *fs_info,
2970 int (*check_func)(struct btrfs_fs_info *, u8 *, u8,
2971 u64));
2972
2973/* dir-item.c */
2974int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
2975 const char *name, int name_len);
2976int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2977 struct btrfs_root *root, const char *name,
2978 int name_len, struct inode *dir,
2979 struct btrfs_key *location, u8 type, u64 index);
2980struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2981 struct btrfs_root *root,
2982 struct btrfs_path *path, u64 dir,
2983 const char *name, int name_len,
2984 int mod);
2985struct btrfs_dir_item *
2986btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2987 struct btrfs_root *root,
2988 struct btrfs_path *path, u64 dir,
2989 u64 objectid, const char *name, int name_len,
2990 int mod);
2991struct btrfs_dir_item *
2992btrfs_search_dir_index_item(struct btrfs_root *root,
2993 struct btrfs_path *path, u64 dirid,
2994 const char *name, int name_len);
2995int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2996 struct btrfs_root *root,
2997 struct btrfs_path *path,
2998 struct btrfs_dir_item *di);
2999int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
3000 struct btrfs_root *root,
3001 struct btrfs_path *path, u64 objectid,
3002 const char *name, u16 name_len,
3003 const void *data, u16 data_len);
3004struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
3005 struct btrfs_root *root,
3006 struct btrfs_path *path, u64 dir,
3007 const char *name, u16 name_len,
3008 int mod);
3009int verify_dir_item(struct btrfs_fs_info *fs_info,
3010 struct extent_buffer *leaf,
3011 struct btrfs_dir_item *dir_item);
3012struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
3013 struct btrfs_path *path,
3014 const char *name,
3015 int name_len);
3016
3017/* orphan.c */
3018int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
3019 struct btrfs_root *root, u64 offset);
3020int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
3021 struct btrfs_root *root, u64 offset);
3022int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
3023
3024/* inode-item.c */
3025int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
3026 struct btrfs_root *root,
3027 const char *name, int name_len,
3028 u64 inode_objectid, u64 ref_objectid, u64 index);
3029int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
3030 struct btrfs_root *root,
3031 const char *name, int name_len,
3032 u64 inode_objectid, u64 ref_objectid, u64 *index);
3033int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
3034 struct btrfs_root *root,
3035 struct btrfs_path *path, u64 objectid);
3036int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
3037 *root, struct btrfs_path *path,
3038 struct btrfs_key *location, int mod);
3039
3040struct btrfs_inode_extref *
3041btrfs_lookup_inode_extref(struct btrfs_trans_handle *trans,
3042 struct btrfs_root *root,
3043 struct btrfs_path *path,
3044 const char *name, int name_len,
3045 u64 inode_objectid, u64 ref_objectid, int ins_len,
3046 int cow);
3047
3048int btrfs_find_name_in_ext_backref(struct btrfs_path *path,
3049 u64 ref_objectid, const char *name,
3050 int name_len,
3051 struct btrfs_inode_extref **extref_ret);
3052
3053/* file-item.c */
3054struct btrfs_dio_private;
3055int btrfs_del_csums(struct btrfs_trans_handle *trans,
3056 struct btrfs_fs_info *fs_info, u64 bytenr, u64 len);
3057int btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst);
3058int btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio,
3059 u64 logical_offset);
3060int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
3061 struct btrfs_root *root,
3062 u64 objectid, u64 pos,
3063 u64 disk_offset, u64 disk_num_bytes,
3064 u64 num_bytes, u64 offset, u64 ram_bytes,
3065 u8 compression, u8 encryption, u16 other_encoding);
3066int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
3067 struct btrfs_root *root,
3068 struct btrfs_path *path, u64 objectid,
3069 u64 bytenr, int mod);
3070int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
3071 struct btrfs_root *root,
3072 struct btrfs_ordered_sum *sums);
3073int btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
3074 u64 file_start, int contig);
3075int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
3076 struct list_head *list, int search_commit);
3077void btrfs_extent_item_to_extent_map(struct inode *inode,
3078 const struct btrfs_path *path,
3079 struct btrfs_file_extent_item *fi,
3080 const bool new_inline,
3081 struct extent_map *em);
3082
3083/* inode.c */
3084struct btrfs_delalloc_work {
3085 struct inode *inode;
3086 int delay_iput;
3087 struct completion completion;
3088 struct list_head list;
3089 struct btrfs_work work;
3090};
3091
3092struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode,
3093 int delay_iput);
3094void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work);
3095
3096struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
3097 size_t pg_offset, u64 start, u64 len,
3098 int create);
3099noinline int can_nocow_extent(struct inode *inode, u64 offset, u64 *len,
3100 u64 *orig_start, u64 *orig_block_len,
3101 u64 *ram_bytes);
3102
3103/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
3104#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
3105#define ClearPageChecked ClearPageFsMisc
3106#define SetPageChecked SetPageFsMisc
3107#define PageChecked PageFsMisc
3108#endif
3109
3110/* This forces readahead on a given range of bytes in an inode */
3111static inline void btrfs_force_ra(struct address_space *mapping,
3112 struct file_ra_state *ra, struct file *file,
3113 pgoff_t offset, unsigned long req_size)
3114{
3115 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
3116}
3117
3118struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
3119int btrfs_set_inode_index(struct inode *dir, u64 *index);
3120int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
3121 struct btrfs_root *root,
3122 struct inode *dir, struct inode *inode,
3123 const char *name, int name_len);
3124int btrfs_add_link(struct btrfs_trans_handle *trans,
3125 struct inode *parent_inode, struct inode *inode,
3126 const char *name, int name_len, int add_backref, u64 index);
3127int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
3128 struct btrfs_root *root,
3129 struct inode *dir, u64 objectid,
3130 const char *name, int name_len);
3131int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
3132 int front);
3133int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
3134 struct btrfs_root *root,
3135 struct inode *inode, u64 new_size,
3136 u32 min_type);
3137
3138int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
3139int btrfs_start_delalloc_roots(struct btrfs_fs_info *fs_info, int delay_iput,
3140 int nr);
3141int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
3142 struct extent_state **cached_state, int dedupe);
3143int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
3144 struct btrfs_root *new_root,
3145 struct btrfs_root *parent_root,
3146 u64 new_dirid);
3147int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
3148 size_t size, struct bio *bio,
3149 unsigned long bio_flags);
3150int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
3151int btrfs_readpage(struct file *file, struct page *page);
3152void btrfs_evict_inode(struct inode *inode);
3153int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
3154struct inode *btrfs_alloc_inode(struct super_block *sb);
3155void btrfs_destroy_inode(struct inode *inode);
3156int btrfs_drop_inode(struct inode *inode);
3157int btrfs_init_cachep(void);
3158void btrfs_destroy_cachep(void);
3159long btrfs_ioctl_trans_end(struct file *file);
3160struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
3161 struct btrfs_root *root, int *was_new);
3162struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
3163 size_t pg_offset, u64 start, u64 end,
3164 int create);
3165int btrfs_update_inode(struct btrfs_trans_handle *trans,
3166 struct btrfs_root *root,
3167 struct inode *inode);
3168int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
3169 struct btrfs_root *root, struct inode *inode);
3170int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
3171int btrfs_orphan_cleanup(struct btrfs_root *root);
3172void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
3173 struct btrfs_root *root);
3174int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
3175void btrfs_invalidate_inodes(struct btrfs_root *root);
3176void btrfs_add_delayed_iput(struct inode *inode);
3177void btrfs_run_delayed_iputs(struct btrfs_fs_info *fs_info);
3178int btrfs_prealloc_file_range(struct inode *inode, int mode,
3179 u64 start, u64 num_bytes, u64 min_size,
3180 loff_t actual_len, u64 *alloc_hint);
3181int btrfs_prealloc_file_range_trans(struct inode *inode,
3182 struct btrfs_trans_handle *trans, int mode,
3183 u64 start, u64 num_bytes, u64 min_size,
3184 loff_t actual_len, u64 *alloc_hint);
3185extern const struct dentry_operations btrfs_dentry_operations;
3186#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3187void btrfs_test_inode_set_ops(struct inode *inode);
3188#endif
3189
3190/* ioctl.c */
3191long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3192long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
3193int btrfs_ioctl_get_supported_features(void __user *arg);
3194void btrfs_update_iflags(struct inode *inode);
3195void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
3196int btrfs_is_empty_uuid(u8 *uuid);
3197int btrfs_defrag_file(struct inode *inode, struct file *file,
3198 struct btrfs_ioctl_defrag_range_args *range,
3199 u64 newer_than, unsigned long max_pages);
3200void btrfs_get_block_group_info(struct list_head *groups_list,
3201 struct btrfs_ioctl_space_info *space);
3202void update_ioctl_balance_args(struct btrfs_fs_info *fs_info, int lock,
3203 struct btrfs_ioctl_balance_args *bargs);
3204ssize_t btrfs_dedupe_file_range(struct file *src_file, u64 loff, u64 olen,
3205 struct file *dst_file, u64 dst_loff);
3206
3207/* file.c */
3208int btrfs_auto_defrag_init(void);
3209void btrfs_auto_defrag_exit(void);
3210int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
3211 struct inode *inode);
3212int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
3213void btrfs_cleanup_defrag_inodes(struct btrfs_fs_info *fs_info);
3214int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
3215void btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
3216 int skip_pinned);
3217extern const struct file_operations btrfs_file_operations;
3218int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
3219 struct btrfs_root *root, struct inode *inode,
3220 struct btrfs_path *path, u64 start, u64 end,
3221 u64 *drop_end, int drop_cache,
3222 int replace_extent,
3223 u32 extent_item_size,
3224 int *key_inserted);
3225int btrfs_drop_extents(struct btrfs_trans_handle *trans,
3226 struct btrfs_root *root, struct inode *inode, u64 start,
3227 u64 end, int drop_cache);
3228int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
3229 struct inode *inode, u64 start, u64 end);
3230int btrfs_release_file(struct inode *inode, struct file *file);
3231int btrfs_dirty_pages(struct inode *inode, struct page **pages,
3232 size_t num_pages, loff_t pos, size_t write_bytes,
3233 struct extent_state **cached);
3234int btrfs_fdatawrite_range(struct inode *inode, loff_t start, loff_t end);
3235int btrfs_clone_file_range(struct file *file_in, loff_t pos_in,
3236 struct file *file_out, loff_t pos_out, u64 len);
3237
3238/* tree-defrag.c */
3239int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
3240 struct btrfs_root *root);
3241
3242/* sysfs.c */
3243int btrfs_init_sysfs(void);
3244void btrfs_exit_sysfs(void);
3245int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info);
3246void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info);
3247
3248/* xattr.c */
3249ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
3250
3251/* super.c */
3252int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
3253 unsigned long new_flags);
3254int btrfs_sync_fs(struct super_block *sb, int wait);
3255
3256static inline __printf(2, 3)
3257void btrfs_no_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
3258{
3259}
3260
3261#ifdef CONFIG_PRINTK
3262__printf(2, 3)
3263void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
3264#else
3265#define btrfs_printk(fs_info, fmt, args...) \
3266 btrfs_no_printk(fs_info, fmt, ##args)
3267#endif
3268
3269#define btrfs_emerg(fs_info, fmt, args...) \
3270 btrfs_printk(fs_info, KERN_EMERG fmt, ##args)
3271#define btrfs_alert(fs_info, fmt, args...) \
3272 btrfs_printk(fs_info, KERN_ALERT fmt, ##args)
3273#define btrfs_crit(fs_info, fmt, args...) \
3274 btrfs_printk(fs_info, KERN_CRIT fmt, ##args)
3275#define btrfs_err(fs_info, fmt, args...) \
3276 btrfs_printk(fs_info, KERN_ERR fmt, ##args)
3277#define btrfs_warn(fs_info, fmt, args...) \
3278 btrfs_printk(fs_info, KERN_WARNING fmt, ##args)
3279#define btrfs_notice(fs_info, fmt, args...) \
3280 btrfs_printk(fs_info, KERN_NOTICE fmt, ##args)
3281#define btrfs_info(fs_info, fmt, args...) \
3282 btrfs_printk(fs_info, KERN_INFO fmt, ##args)
3283
3284/*
3285 * Wrappers that use printk_in_rcu
3286 */
3287#define btrfs_emerg_in_rcu(fs_info, fmt, args...) \
3288 btrfs_printk_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3289#define btrfs_alert_in_rcu(fs_info, fmt, args...) \
3290 btrfs_printk_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3291#define btrfs_crit_in_rcu(fs_info, fmt, args...) \
3292 btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3293#define btrfs_err_in_rcu(fs_info, fmt, args...) \
3294 btrfs_printk_in_rcu(fs_info, KERN_ERR fmt, ##args)
3295#define btrfs_warn_in_rcu(fs_info, fmt, args...) \
3296 btrfs_printk_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3297#define btrfs_notice_in_rcu(fs_info, fmt, args...) \
3298 btrfs_printk_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3299#define btrfs_info_in_rcu(fs_info, fmt, args...) \
3300 btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
3301
3302/*
3303 * Wrappers that use a ratelimited printk_in_rcu
3304 */
3305#define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
3306 btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
3307#define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
3308 btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
3309#define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
3310 btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
3311#define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
3312 btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
3313#define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
3314 btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
3315#define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
3316 btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
3317#define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
3318 btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
3319
3320/*
3321 * Wrappers that use a ratelimited printk
3322 */
3323#define btrfs_emerg_rl(fs_info, fmt, args...) \
3324 btrfs_printk_ratelimited(fs_info, KERN_EMERG fmt, ##args)
3325#define btrfs_alert_rl(fs_info, fmt, args...) \
3326 btrfs_printk_ratelimited(fs_info, KERN_ALERT fmt, ##args)
3327#define btrfs_crit_rl(fs_info, fmt, args...) \
3328 btrfs_printk_ratelimited(fs_info, KERN_CRIT fmt, ##args)
3329#define btrfs_err_rl(fs_info, fmt, args...) \
3330 btrfs_printk_ratelimited(fs_info, KERN_ERR fmt, ##args)
3331#define btrfs_warn_rl(fs_info, fmt, args...) \
3332 btrfs_printk_ratelimited(fs_info, KERN_WARNING fmt, ##args)
3333#define btrfs_notice_rl(fs_info, fmt, args...) \
3334 btrfs_printk_ratelimited(fs_info, KERN_NOTICE fmt, ##args)
3335#define btrfs_info_rl(fs_info, fmt, args...) \
3336 btrfs_printk_ratelimited(fs_info, KERN_INFO fmt, ##args)
3337
3338#if defined(CONFIG_DYNAMIC_DEBUG)
3339#define btrfs_debug(fs_info, fmt, args...) \
3340do { \
3341 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
3342 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
3343 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args); \
3344} while (0)
3345#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3346do { \
3347 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
3348 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
3349 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args); \
3350} while (0)
3351#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3352do { \
3353 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
3354 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
3355 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, \
3356 ##args);\
3357} while (0)
3358#define btrfs_debug_rl(fs_info, fmt, args...) \
3359do { \
3360 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
3361 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)) \
3362 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, \
3363 ##args); \
3364} while (0)
3365#elif defined(DEBUG)
3366#define btrfs_debug(fs_info, fmt, args...) \
3367 btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
3368#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3369 btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3370#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3371 btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
3372#define btrfs_debug_rl(fs_info, fmt, args...) \
3373 btrfs_printk_ratelimited(fs_info, KERN_DEBUG fmt, ##args)
3374#else
3375#define btrfs_debug(fs_info, fmt, args...) \
3376 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3377#define btrfs_debug_in_rcu(fs_info, fmt, args...) \
3378 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3379#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
3380 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3381#define btrfs_debug_rl(fs_info, fmt, args...) \
3382 btrfs_no_printk(fs_info, KERN_DEBUG fmt, ##args)
3383#endif
3384
3385#define btrfs_printk_in_rcu(fs_info, fmt, args...) \
3386do { \
3387 rcu_read_lock(); \
3388 btrfs_printk(fs_info, fmt, ##args); \
3389 rcu_read_unlock(); \
3390} while (0)
3391
3392#define btrfs_printk_ratelimited(fs_info, fmt, args...) \
3393do { \
3394 static DEFINE_RATELIMIT_STATE(_rs, \
3395 DEFAULT_RATELIMIT_INTERVAL, \
3396 DEFAULT_RATELIMIT_BURST); \
3397 if (__ratelimit(&_rs)) \
3398 btrfs_printk(fs_info, fmt, ##args); \
3399} while (0)
3400
3401#define btrfs_printk_rl_in_rcu(fs_info, fmt, args...) \
3402do { \
3403 rcu_read_lock(); \
3404 btrfs_printk_ratelimited(fs_info, fmt, ##args); \
3405 rcu_read_unlock(); \
3406} while (0)
3407
3408#ifdef CONFIG_BTRFS_ASSERT
3409
3410__cold
3411static inline void assfail(char *expr, char *file, int line)
3412{
3413 pr_err("assertion failed: %s, file: %s, line: %d\n",
3414 expr, file, line);
3415 BUG();
3416}
3417
3418#define ASSERT(expr) \
3419 (likely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
3420#else
3421#define ASSERT(expr) ((void)0)
3422#endif
3423
3424__printf(5, 6)
3425__cold
3426void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,
3427 unsigned int line, int errno, const char *fmt, ...);
3428
3429const char *btrfs_decode_error(int errno);
3430
3431__cold
3432void __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
3433 const char *function,
3434 unsigned int line, int errno);
3435
3436/*
3437 * Call btrfs_abort_transaction as early as possible when an error condition is
3438 * detected, that way the exact line number is reported.
3439 */
3440#define btrfs_abort_transaction(trans, errno) \
3441do { \
3442 /* Report first abort since mount */ \
3443 if (!test_and_set_bit(BTRFS_FS_STATE_TRANS_ABORTED, \
3444 &((trans)->fs_info->fs_state))) { \
3445 if ((errno) != -EIO) { \
3446 WARN(1, KERN_DEBUG \
3447 "BTRFS: Transaction aborted (error %d)\n", \
3448 (errno)); \
3449 } else { \
3450 pr_debug("BTRFS: Transaction aborted (error %d)\n", \
3451 (errno)); \
3452 } \
3453 } \
3454 __btrfs_abort_transaction((trans), __func__, \
3455 __LINE__, (errno)); \
3456} while (0)
3457
3458#define btrfs_handle_fs_error(fs_info, errno, fmt, args...) \
3459do { \
3460 __btrfs_handle_fs_error((fs_info), __func__, __LINE__, \
3461 (errno), fmt, ##args); \
3462} while (0)
3463
3464__printf(5, 6)
3465__cold
3466void __btrfs_panic(struct btrfs_fs_info *fs_info, const char *function,
3467 unsigned int line, int errno, const char *fmt, ...);
3468/*
3469 * If BTRFS_MOUNT_PANIC_ON_FATAL_ERROR is in mount_opt, __btrfs_panic
3470 * will panic(). Otherwise we BUG() here.
3471 */
3472#define btrfs_panic(fs_info, errno, fmt, args...) \
3473do { \
3474 __btrfs_panic(fs_info, __func__, __LINE__, errno, fmt, ##args); \
3475 BUG(); \
3476} while (0)
3477
3478
3479/* compatibility and incompatibility defines */
3480
3481#define btrfs_set_fs_incompat(__fs_info, opt) \
3482 __btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3483
3484static inline void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info,
3485 u64 flag)
3486{
3487 struct btrfs_super_block *disk_super;
3488 u64 features;
3489
3490 disk_super = fs_info->super_copy;
3491 features = btrfs_super_incompat_flags(disk_super);
3492 if (!(features & flag)) {
3493 spin_lock(&fs_info->super_lock);
3494 features = btrfs_super_incompat_flags(disk_super);
3495 if (!(features & flag)) {
3496 features |= flag;
3497 btrfs_set_super_incompat_flags(disk_super, features);
3498 btrfs_info(fs_info, "setting %llu feature flag",
3499 flag);
3500 }
3501 spin_unlock(&fs_info->super_lock);
3502 }
3503}
3504
3505#define btrfs_clear_fs_incompat(__fs_info, opt) \
3506 __btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3507
3508static inline void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info,
3509 u64 flag)
3510{
3511 struct btrfs_super_block *disk_super;
3512 u64 features;
3513
3514 disk_super = fs_info->super_copy;
3515 features = btrfs_super_incompat_flags(disk_super);
3516 if (features & flag) {
3517 spin_lock(&fs_info->super_lock);
3518 features = btrfs_super_incompat_flags(disk_super);
3519 if (features & flag) {
3520 features &= ~flag;
3521 btrfs_set_super_incompat_flags(disk_super, features);
3522 btrfs_info(fs_info, "clearing %llu feature flag",
3523 flag);
3524 }
3525 spin_unlock(&fs_info->super_lock);
3526 }
3527}
3528
3529#define btrfs_fs_incompat(fs_info, opt) \
3530 __btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
3531
3532static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
3533{
3534 struct btrfs_super_block *disk_super;
3535 disk_super = fs_info->super_copy;
3536 return !!(btrfs_super_incompat_flags(disk_super) & flag);
3537}
3538
3539#define btrfs_set_fs_compat_ro(__fs_info, opt) \
3540 __btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3541
3542static inline void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info,
3543 u64 flag)
3544{
3545 struct btrfs_super_block *disk_super;
3546 u64 features;
3547
3548 disk_super = fs_info->super_copy;
3549 features = btrfs_super_compat_ro_flags(disk_super);
3550 if (!(features & flag)) {
3551 spin_lock(&fs_info->super_lock);
3552 features = btrfs_super_compat_ro_flags(disk_super);
3553 if (!(features & flag)) {
3554 features |= flag;
3555 btrfs_set_super_compat_ro_flags(disk_super, features);
3556 btrfs_info(fs_info, "setting %llu ro feature flag",
3557 flag);
3558 }
3559 spin_unlock(&fs_info->super_lock);
3560 }
3561}
3562
3563#define btrfs_clear_fs_compat_ro(__fs_info, opt) \
3564 __btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3565
3566static inline void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info,
3567 u64 flag)
3568{
3569 struct btrfs_super_block *disk_super;
3570 u64 features;
3571
3572 disk_super = fs_info->super_copy;
3573 features = btrfs_super_compat_ro_flags(disk_super);
3574 if (features & flag) {
3575 spin_lock(&fs_info->super_lock);
3576 features = btrfs_super_compat_ro_flags(disk_super);
3577 if (features & flag) {
3578 features &= ~flag;
3579 btrfs_set_super_compat_ro_flags(disk_super, features);
3580 btrfs_info(fs_info, "clearing %llu ro feature flag",
3581 flag);
3582 }
3583 spin_unlock(&fs_info->super_lock);
3584 }
3585}
3586
3587#define btrfs_fs_compat_ro(fs_info, opt) \
3588 __btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
3589
3590static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
3591{
3592 struct btrfs_super_block *disk_super;
3593 disk_super = fs_info->super_copy;
3594 return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
3595}
3596
3597/* acl.c */
3598#ifdef CONFIG_BTRFS_FS_POSIX_ACL
3599struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
3600int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type);
3601int btrfs_init_acl(struct btrfs_trans_handle *trans,
3602 struct inode *inode, struct inode *dir);
3603#else
3604#define btrfs_get_acl NULL
3605#define btrfs_set_acl NULL
3606static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
3607 struct inode *inode, struct inode *dir)
3608{
3609 return 0;
3610}
3611#endif
3612
3613/* relocation.c */
3614int btrfs_relocate_block_group(struct btrfs_fs_info *fs_info, u64 group_start);
3615int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
3616 struct btrfs_root *root);
3617int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
3618 struct btrfs_root *root);
3619int btrfs_recover_relocation(struct btrfs_root *root);
3620int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
3621int btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
3622 struct btrfs_root *root, struct extent_buffer *buf,
3623 struct extent_buffer *cow);
3624void btrfs_reloc_pre_snapshot(struct btrfs_pending_snapshot *pending,
3625 u64 *bytes_to_reserve);
3626int btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
3627 struct btrfs_pending_snapshot *pending);
3628
3629/* scrub.c */
3630int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3631 u64 end, struct btrfs_scrub_progress *progress,
3632 int readonly, int is_dev_replace);
3633void btrfs_scrub_pause(struct btrfs_fs_info *fs_info);
3634void btrfs_scrub_continue(struct btrfs_fs_info *fs_info);
3635int btrfs_scrub_cancel(struct btrfs_fs_info *info);
3636int btrfs_scrub_cancel_dev(struct btrfs_fs_info *info,
3637 struct btrfs_device *dev);
3638int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
3639 struct btrfs_scrub_progress *progress);
3640
3641/* dev-replace.c */
3642void btrfs_bio_counter_inc_blocked(struct btrfs_fs_info *fs_info);
3643void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info);
3644void btrfs_bio_counter_sub(struct btrfs_fs_info *fs_info, s64 amount);
3645
3646static inline void btrfs_bio_counter_dec(struct btrfs_fs_info *fs_info)
3647{
3648 btrfs_bio_counter_sub(fs_info, 1);
3649}
3650
3651/* reada.c */
3652struct reada_control {
3653 struct btrfs_fs_info *fs_info; /* tree to prefetch */
3654 struct btrfs_key key_start;
3655 struct btrfs_key key_end; /* exclusive */
3656 atomic_t elems;
3657 struct kref refcnt;
3658 wait_queue_head_t wait;
3659};
3660struct reada_control *btrfs_reada_add(struct btrfs_root *root,
3661 struct btrfs_key *start, struct btrfs_key *end);
3662int btrfs_reada_wait(void *handle);
3663void btrfs_reada_detach(void *handle);
3664int btree_readahead_hook(struct btrfs_fs_info *fs_info,
3665 struct extent_buffer *eb, int err);
3666
3667static inline int is_fstree(u64 rootid)
3668{
3669 if (rootid == BTRFS_FS_TREE_OBJECTID ||
3670 ((s64)rootid >= (s64)BTRFS_FIRST_FREE_OBJECTID &&
3671 !btrfs_qgroup_level(rootid)))
3672 return 1;
3673 return 0;
3674}
3675
3676static inline int btrfs_defrag_cancelled(struct btrfs_fs_info *fs_info)
3677{
3678 return signal_pending(current);
3679}
3680
3681/* Sanity test specific functions */
3682#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3683void btrfs_test_destroy_inode(struct inode *inode);
3684#endif
3685
3686static inline int btrfs_is_testing(struct btrfs_fs_info *fs_info)
3687{
3688#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
3689 if (unlikely(test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO,
3690 &fs_info->fs_state)))
3691 return 1;
3692#endif
3693 return 0;
3694}
3695#endif
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/completion.h>
27#include <linux/backing-dev.h>
28#include <linux/wait.h>
29#include <linux/slab.h>
30#include <linux/kobject.h>
31#include <trace/events/btrfs.h>
32#include <asm/kmap_types.h>
33#include "extent_io.h"
34#include "extent_map.h"
35#include "async-thread.h"
36#include "ioctl.h"
37
38struct btrfs_trans_handle;
39struct btrfs_transaction;
40struct btrfs_pending_snapshot;
41extern struct kmem_cache *btrfs_trans_handle_cachep;
42extern struct kmem_cache *btrfs_transaction_cachep;
43extern struct kmem_cache *btrfs_bit_radix_cachep;
44extern struct kmem_cache *btrfs_path_cachep;
45extern struct kmem_cache *btrfs_free_space_cachep;
46struct btrfs_ordered_sum;
47
48#define BTRFS_MAGIC "_BHRfS_M"
49
50#define BTRFS_MAX_LEVEL 8
51
52#define BTRFS_COMPAT_EXTENT_TREE_V0
53
54/*
55 * files bigger than this get some pre-flushing when they are added
56 * to the ordered operations list. That way we limit the total
57 * work done by the commit
58 */
59#define BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT (8 * 1024 * 1024)
60
61/* holds pointers to all of the tree roots */
62#define BTRFS_ROOT_TREE_OBJECTID 1ULL
63
64/* stores information about which extents are in use, and reference counts */
65#define BTRFS_EXTENT_TREE_OBJECTID 2ULL
66
67/*
68 * chunk tree stores translations from logical -> physical block numbering
69 * the super block points to the chunk tree
70 */
71#define BTRFS_CHUNK_TREE_OBJECTID 3ULL
72
73/*
74 * stores information about which areas of a given device are in use.
75 * one per device. The tree of tree roots points to the device tree
76 */
77#define BTRFS_DEV_TREE_OBJECTID 4ULL
78
79/* one per subvolume, storing files and directories */
80#define BTRFS_FS_TREE_OBJECTID 5ULL
81
82/* directory objectid inside the root tree */
83#define BTRFS_ROOT_TREE_DIR_OBJECTID 6ULL
84
85/* holds checksums of all the data extents */
86#define BTRFS_CSUM_TREE_OBJECTID 7ULL
87
88/* orhpan objectid for tracking unlinked/truncated files */
89#define BTRFS_ORPHAN_OBJECTID -5ULL
90
91/* does write ahead logging to speed up fsyncs */
92#define BTRFS_TREE_LOG_OBJECTID -6ULL
93#define BTRFS_TREE_LOG_FIXUP_OBJECTID -7ULL
94
95/* for space balancing */
96#define BTRFS_TREE_RELOC_OBJECTID -8ULL
97#define BTRFS_DATA_RELOC_TREE_OBJECTID -9ULL
98
99/*
100 * extent checksums all have this objectid
101 * this allows them to share the logging tree
102 * for fsyncs
103 */
104#define BTRFS_EXTENT_CSUM_OBJECTID -10ULL
105
106/* For storing free space cache */
107#define BTRFS_FREE_SPACE_OBJECTID -11ULL
108
109/*
110 * The inode number assigned to the special inode for sotring
111 * free ino cache
112 */
113#define BTRFS_FREE_INO_OBJECTID -12ULL
114
115/* dummy objectid represents multiple objectids */
116#define BTRFS_MULTIPLE_OBJECTIDS -255ULL
117
118/*
119 * All files have objectids in this range.
120 */
121#define BTRFS_FIRST_FREE_OBJECTID 256ULL
122#define BTRFS_LAST_FREE_OBJECTID -256ULL
123#define BTRFS_FIRST_CHUNK_TREE_OBJECTID 256ULL
124
125
126/*
127 * the device items go into the chunk tree. The key is in the form
128 * [ 1 BTRFS_DEV_ITEM_KEY device_id ]
129 */
130#define BTRFS_DEV_ITEMS_OBJECTID 1ULL
131
132#define BTRFS_BTREE_INODE_OBJECTID 1
133
134#define BTRFS_EMPTY_SUBVOL_DIR_OBJECTID 2
135
136/*
137 * we can actually store much bigger names, but lets not confuse the rest
138 * of linux
139 */
140#define BTRFS_NAME_LEN 255
141
142/* 32 bytes in various csum fields */
143#define BTRFS_CSUM_SIZE 32
144
145/* csum types */
146#define BTRFS_CSUM_TYPE_CRC32 0
147
148static int btrfs_csum_sizes[] = { 4, 0 };
149
150/* four bytes for CRC32 */
151#define BTRFS_EMPTY_DIR_SIZE 0
152
153#define BTRFS_FT_UNKNOWN 0
154#define BTRFS_FT_REG_FILE 1
155#define BTRFS_FT_DIR 2
156#define BTRFS_FT_CHRDEV 3
157#define BTRFS_FT_BLKDEV 4
158#define BTRFS_FT_FIFO 5
159#define BTRFS_FT_SOCK 6
160#define BTRFS_FT_SYMLINK 7
161#define BTRFS_FT_XATTR 8
162#define BTRFS_FT_MAX 9
163
164/*
165 * The key defines the order in the tree, and so it also defines (optimal)
166 * block layout.
167 *
168 * objectid corresponds to the inode number.
169 *
170 * type tells us things about the object, and is a kind of stream selector.
171 * so for a given inode, keys with type of 1 might refer to the inode data,
172 * type of 2 may point to file data in the btree and type == 3 may point to
173 * extents.
174 *
175 * offset is the starting byte offset for this key in the stream.
176 *
177 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
178 * in cpu native order. Otherwise they are identical and their sizes
179 * should be the same (ie both packed)
180 */
181struct btrfs_disk_key {
182 __le64 objectid;
183 u8 type;
184 __le64 offset;
185} __attribute__ ((__packed__));
186
187struct btrfs_key {
188 u64 objectid;
189 u8 type;
190 u64 offset;
191} __attribute__ ((__packed__));
192
193struct btrfs_mapping_tree {
194 struct extent_map_tree map_tree;
195};
196
197struct btrfs_dev_item {
198 /* the internal btrfs device id */
199 __le64 devid;
200
201 /* size of the device */
202 __le64 total_bytes;
203
204 /* bytes used */
205 __le64 bytes_used;
206
207 /* optimal io alignment for this device */
208 __le32 io_align;
209
210 /* optimal io width for this device */
211 __le32 io_width;
212
213 /* minimal io size for this device */
214 __le32 sector_size;
215
216 /* type and info about this device */
217 __le64 type;
218
219 /* expected generation for this device */
220 __le64 generation;
221
222 /*
223 * starting byte of this partition on the device,
224 * to allow for stripe alignment in the future
225 */
226 __le64 start_offset;
227
228 /* grouping information for allocation decisions */
229 __le32 dev_group;
230
231 /* seek speed 0-100 where 100 is fastest */
232 u8 seek_speed;
233
234 /* bandwidth 0-100 where 100 is fastest */
235 u8 bandwidth;
236
237 /* btrfs generated uuid for this device */
238 u8 uuid[BTRFS_UUID_SIZE];
239
240 /* uuid of FS who owns this device */
241 u8 fsid[BTRFS_UUID_SIZE];
242} __attribute__ ((__packed__));
243
244struct btrfs_stripe {
245 __le64 devid;
246 __le64 offset;
247 u8 dev_uuid[BTRFS_UUID_SIZE];
248} __attribute__ ((__packed__));
249
250struct btrfs_chunk {
251 /* size of this chunk in bytes */
252 __le64 length;
253
254 /* objectid of the root referencing this chunk */
255 __le64 owner;
256
257 __le64 stripe_len;
258 __le64 type;
259
260 /* optimal io alignment for this chunk */
261 __le32 io_align;
262
263 /* optimal io width for this chunk */
264 __le32 io_width;
265
266 /* minimal io size for this chunk */
267 __le32 sector_size;
268
269 /* 2^16 stripes is quite a lot, a second limit is the size of a single
270 * item in the btree
271 */
272 __le16 num_stripes;
273
274 /* sub stripes only matter for raid10 */
275 __le16 sub_stripes;
276 struct btrfs_stripe stripe;
277 /* additional stripes go here */
278} __attribute__ ((__packed__));
279
280#define BTRFS_FREE_SPACE_EXTENT 1
281#define BTRFS_FREE_SPACE_BITMAP 2
282
283struct btrfs_free_space_entry {
284 __le64 offset;
285 __le64 bytes;
286 u8 type;
287} __attribute__ ((__packed__));
288
289struct btrfs_free_space_header {
290 struct btrfs_disk_key location;
291 __le64 generation;
292 __le64 num_entries;
293 __le64 num_bitmaps;
294} __attribute__ ((__packed__));
295
296static inline unsigned long btrfs_chunk_item_size(int num_stripes)
297{
298 BUG_ON(num_stripes == 0);
299 return sizeof(struct btrfs_chunk) +
300 sizeof(struct btrfs_stripe) * (num_stripes - 1);
301}
302
303#define BTRFS_HEADER_FLAG_WRITTEN (1ULL << 0)
304#define BTRFS_HEADER_FLAG_RELOC (1ULL << 1)
305
306/*
307 * File system states
308 */
309
310/* Errors detected */
311#define BTRFS_SUPER_FLAG_ERROR (1ULL << 2)
312
313#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
314#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
315
316#define BTRFS_BACKREF_REV_MAX 256
317#define BTRFS_BACKREF_REV_SHIFT 56
318#define BTRFS_BACKREF_REV_MASK (((u64)BTRFS_BACKREF_REV_MAX - 1) << \
319 BTRFS_BACKREF_REV_SHIFT)
320
321#define BTRFS_OLD_BACKREF_REV 0
322#define BTRFS_MIXED_BACKREF_REV 1
323
324/*
325 * every tree block (leaf or node) starts with this header.
326 */
327struct btrfs_header {
328 /* these first four must match the super block */
329 u8 csum[BTRFS_CSUM_SIZE];
330 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
331 __le64 bytenr; /* which block this node is supposed to live in */
332 __le64 flags;
333
334 /* allowed to be different from the super from here on down */
335 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
336 __le64 generation;
337 __le64 owner;
338 __le32 nritems;
339 u8 level;
340} __attribute__ ((__packed__));
341
342#define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
343 sizeof(struct btrfs_header)) / \
344 sizeof(struct btrfs_key_ptr))
345#define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
346#define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
347#define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
348 sizeof(struct btrfs_item) - \
349 sizeof(struct btrfs_file_extent_item))
350#define BTRFS_MAX_XATTR_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
351 sizeof(struct btrfs_item) -\
352 sizeof(struct btrfs_dir_item))
353
354
355/*
356 * this is a very generous portion of the super block, giving us
357 * room to translate 14 chunks with 3 stripes each.
358 */
359#define BTRFS_SYSTEM_CHUNK_ARRAY_SIZE 2048
360#define BTRFS_LABEL_SIZE 256
361
362/*
363 * the super block basically lists the main trees of the FS
364 * it currently lacks any block count etc etc
365 */
366struct btrfs_super_block {
367 u8 csum[BTRFS_CSUM_SIZE];
368 /* the first 4 fields must match struct btrfs_header */
369 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
370 __le64 bytenr; /* this block number */
371 __le64 flags;
372
373 /* allowed to be different from the btrfs_header from here own down */
374 __le64 magic;
375 __le64 generation;
376 __le64 root;
377 __le64 chunk_root;
378 __le64 log_root;
379
380 /* this will help find the new super based on the log root */
381 __le64 log_root_transid;
382 __le64 total_bytes;
383 __le64 bytes_used;
384 __le64 root_dir_objectid;
385 __le64 num_devices;
386 __le32 sectorsize;
387 __le32 nodesize;
388 __le32 leafsize;
389 __le32 stripesize;
390 __le32 sys_chunk_array_size;
391 __le64 chunk_root_generation;
392 __le64 compat_flags;
393 __le64 compat_ro_flags;
394 __le64 incompat_flags;
395 __le16 csum_type;
396 u8 root_level;
397 u8 chunk_root_level;
398 u8 log_root_level;
399 struct btrfs_dev_item dev_item;
400
401 char label[BTRFS_LABEL_SIZE];
402
403 __le64 cache_generation;
404
405 /* future expansion */
406 __le64 reserved[31];
407 u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
408} __attribute__ ((__packed__));
409
410/*
411 * Compat flags that we support. If any incompat flags are set other than the
412 * ones specified below then we will fail to mount
413 */
414#define BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF (1ULL << 0)
415#define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL (1ULL << 1)
416#define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS (1ULL << 2)
417#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO (1ULL << 3)
418
419#define BTRFS_FEATURE_COMPAT_SUPP 0ULL
420#define BTRFS_FEATURE_COMPAT_RO_SUPP 0ULL
421#define BTRFS_FEATURE_INCOMPAT_SUPP \
422 (BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF | \
423 BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL | \
424 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS | \
425 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO)
426
427/*
428 * A leaf is full of items. offset and size tell us where to find
429 * the item in the leaf (relative to the start of the data area)
430 */
431struct btrfs_item {
432 struct btrfs_disk_key key;
433 __le32 offset;
434 __le32 size;
435} __attribute__ ((__packed__));
436
437/*
438 * leaves have an item area and a data area:
439 * [item0, item1....itemN] [free space] [dataN...data1, data0]
440 *
441 * The data is separate from the items to get the keys closer together
442 * during searches.
443 */
444struct btrfs_leaf {
445 struct btrfs_header header;
446 struct btrfs_item items[];
447} __attribute__ ((__packed__));
448
449/*
450 * all non-leaf blocks are nodes, they hold only keys and pointers to
451 * other blocks
452 */
453struct btrfs_key_ptr {
454 struct btrfs_disk_key key;
455 __le64 blockptr;
456 __le64 generation;
457} __attribute__ ((__packed__));
458
459struct btrfs_node {
460 struct btrfs_header header;
461 struct btrfs_key_ptr ptrs[];
462} __attribute__ ((__packed__));
463
464/*
465 * btrfs_paths remember the path taken from the root down to the leaf.
466 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
467 * to any other levels that are present.
468 *
469 * The slots array records the index of the item or block pointer
470 * used while walking the tree.
471 */
472struct btrfs_path {
473 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
474 int slots[BTRFS_MAX_LEVEL];
475 /* if there is real range locking, this locks field will change */
476 int locks[BTRFS_MAX_LEVEL];
477 int reada;
478 /* keep some upper locks as we walk down */
479 int lowest_level;
480
481 /*
482 * set by btrfs_split_item, tells search_slot to keep all locks
483 * and to force calls to keep space in the nodes
484 */
485 unsigned int search_for_split:1;
486 unsigned int keep_locks:1;
487 unsigned int skip_locking:1;
488 unsigned int leave_spinning:1;
489 unsigned int search_commit_root:1;
490};
491
492/*
493 * items in the extent btree are used to record the objectid of the
494 * owner of the block and the number of references
495 */
496
497struct btrfs_extent_item {
498 __le64 refs;
499 __le64 generation;
500 __le64 flags;
501} __attribute__ ((__packed__));
502
503struct btrfs_extent_item_v0 {
504 __le32 refs;
505} __attribute__ ((__packed__));
506
507#define BTRFS_MAX_EXTENT_ITEM_SIZE(r) ((BTRFS_LEAF_DATA_SIZE(r) >> 4) - \
508 sizeof(struct btrfs_item))
509
510#define BTRFS_EXTENT_FLAG_DATA (1ULL << 0)
511#define BTRFS_EXTENT_FLAG_TREE_BLOCK (1ULL << 1)
512
513/* following flags only apply to tree blocks */
514
515/* use full backrefs for extent pointers in the block */
516#define BTRFS_BLOCK_FLAG_FULL_BACKREF (1ULL << 8)
517
518/*
519 * this flag is only used internally by scrub and may be changed at any time
520 * it is only declared here to avoid collisions
521 */
522#define BTRFS_EXTENT_FLAG_SUPER (1ULL << 48)
523
524struct btrfs_tree_block_info {
525 struct btrfs_disk_key key;
526 u8 level;
527} __attribute__ ((__packed__));
528
529struct btrfs_extent_data_ref {
530 __le64 root;
531 __le64 objectid;
532 __le64 offset;
533 __le32 count;
534} __attribute__ ((__packed__));
535
536struct btrfs_shared_data_ref {
537 __le32 count;
538} __attribute__ ((__packed__));
539
540struct btrfs_extent_inline_ref {
541 u8 type;
542 __le64 offset;
543} __attribute__ ((__packed__));
544
545/* old style backrefs item */
546struct btrfs_extent_ref_v0 {
547 __le64 root;
548 __le64 generation;
549 __le64 objectid;
550 __le32 count;
551} __attribute__ ((__packed__));
552
553
554/* dev extents record free space on individual devices. The owner
555 * field points back to the chunk allocation mapping tree that allocated
556 * the extent. The chunk tree uuid field is a way to double check the owner
557 */
558struct btrfs_dev_extent {
559 __le64 chunk_tree;
560 __le64 chunk_objectid;
561 __le64 chunk_offset;
562 __le64 length;
563 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
564} __attribute__ ((__packed__));
565
566struct btrfs_inode_ref {
567 __le64 index;
568 __le16 name_len;
569 /* name goes here */
570} __attribute__ ((__packed__));
571
572struct btrfs_timespec {
573 __le64 sec;
574 __le32 nsec;
575} __attribute__ ((__packed__));
576
577enum btrfs_compression_type {
578 BTRFS_COMPRESS_NONE = 0,
579 BTRFS_COMPRESS_ZLIB = 1,
580 BTRFS_COMPRESS_LZO = 2,
581 BTRFS_COMPRESS_TYPES = 2,
582 BTRFS_COMPRESS_LAST = 3,
583};
584
585struct btrfs_inode_item {
586 /* nfs style generation number */
587 __le64 generation;
588 /* transid that last touched this inode */
589 __le64 transid;
590 __le64 size;
591 __le64 nbytes;
592 __le64 block_group;
593 __le32 nlink;
594 __le32 uid;
595 __le32 gid;
596 __le32 mode;
597 __le64 rdev;
598 __le64 flags;
599
600 /* modification sequence number for NFS */
601 __le64 sequence;
602
603 /*
604 * a little future expansion, for more than this we can
605 * just grow the inode item and version it
606 */
607 __le64 reserved[4];
608 struct btrfs_timespec atime;
609 struct btrfs_timespec ctime;
610 struct btrfs_timespec mtime;
611 struct btrfs_timespec otime;
612} __attribute__ ((__packed__));
613
614struct btrfs_dir_log_item {
615 __le64 end;
616} __attribute__ ((__packed__));
617
618struct btrfs_dir_item {
619 struct btrfs_disk_key location;
620 __le64 transid;
621 __le16 data_len;
622 __le16 name_len;
623 u8 type;
624} __attribute__ ((__packed__));
625
626#define BTRFS_ROOT_SUBVOL_RDONLY (1ULL << 0)
627
628struct btrfs_root_item {
629 struct btrfs_inode_item inode;
630 __le64 generation;
631 __le64 root_dirid;
632 __le64 bytenr;
633 __le64 byte_limit;
634 __le64 bytes_used;
635 __le64 last_snapshot;
636 __le64 flags;
637 __le32 refs;
638 struct btrfs_disk_key drop_progress;
639 u8 drop_level;
640 u8 level;
641} __attribute__ ((__packed__));
642
643/*
644 * this is used for both forward and backward root refs
645 */
646struct btrfs_root_ref {
647 __le64 dirid;
648 __le64 sequence;
649 __le16 name_len;
650} __attribute__ ((__packed__));
651
652#define BTRFS_FILE_EXTENT_INLINE 0
653#define BTRFS_FILE_EXTENT_REG 1
654#define BTRFS_FILE_EXTENT_PREALLOC 2
655
656struct btrfs_file_extent_item {
657 /*
658 * transaction id that created this extent
659 */
660 __le64 generation;
661 /*
662 * max number of bytes to hold this extent in ram
663 * when we split a compressed extent we can't know how big
664 * each of the resulting pieces will be. So, this is
665 * an upper limit on the size of the extent in ram instead of
666 * an exact limit.
667 */
668 __le64 ram_bytes;
669
670 /*
671 * 32 bits for the various ways we might encode the data,
672 * including compression and encryption. If any of these
673 * are set to something a given disk format doesn't understand
674 * it is treated like an incompat flag for reading and writing,
675 * but not for stat.
676 */
677 u8 compression;
678 u8 encryption;
679 __le16 other_encoding; /* spare for later use */
680
681 /* are we inline data or a real extent? */
682 u8 type;
683
684 /*
685 * disk space consumed by the extent, checksum blocks are included
686 * in these numbers
687 */
688 __le64 disk_bytenr;
689 __le64 disk_num_bytes;
690 /*
691 * the logical offset in file blocks (no csums)
692 * this extent record is for. This allows a file extent to point
693 * into the middle of an existing extent on disk, sharing it
694 * between two snapshots (useful if some bytes in the middle of the
695 * extent have changed
696 */
697 __le64 offset;
698 /*
699 * the logical number of file blocks (no csums included). This
700 * always reflects the size uncompressed and without encoding.
701 */
702 __le64 num_bytes;
703
704} __attribute__ ((__packed__));
705
706struct btrfs_csum_item {
707 u8 csum;
708} __attribute__ ((__packed__));
709
710/* different types of block groups (and chunks) */
711#define BTRFS_BLOCK_GROUP_DATA (1 << 0)
712#define BTRFS_BLOCK_GROUP_SYSTEM (1 << 1)
713#define BTRFS_BLOCK_GROUP_METADATA (1 << 2)
714#define BTRFS_BLOCK_GROUP_RAID0 (1 << 3)
715#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
716#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
717#define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
718#define BTRFS_NR_RAID_TYPES 5
719
720struct btrfs_block_group_item {
721 __le64 used;
722 __le64 chunk_objectid;
723 __le64 flags;
724} __attribute__ ((__packed__));
725
726struct btrfs_space_info {
727 u64 flags;
728
729 u64 total_bytes; /* total bytes in the space,
730 this doesn't take mirrors into account */
731 u64 bytes_used; /* total bytes used,
732 this doesn't take mirrors into account */
733 u64 bytes_pinned; /* total bytes pinned, will be freed when the
734 transaction finishes */
735 u64 bytes_reserved; /* total bytes the allocator has reserved for
736 current allocations */
737 u64 bytes_readonly; /* total bytes that are read only */
738
739 u64 bytes_may_use; /* number of bytes that may be used for
740 delalloc/allocations */
741 u64 disk_used; /* total bytes used on disk */
742 u64 disk_total; /* total bytes on disk, takes mirrors into
743 account */
744
745 /*
746 * we bump reservation progress every time we decrement
747 * bytes_reserved. This way people waiting for reservations
748 * know something good has happened and they can check
749 * for progress. The number here isn't to be trusted, it
750 * just shows reclaim activity
751 */
752 unsigned long reservation_progress;
753
754 unsigned int full:1; /* indicates that we cannot allocate any more
755 chunks for this space */
756 unsigned int chunk_alloc:1; /* set if we are allocating a chunk */
757
758 unsigned int flush:1; /* set if we are trying to make space */
759
760 unsigned int force_alloc; /* set if we need to force a chunk
761 alloc for this space */
762
763 struct list_head list;
764
765 /* for block groups in our same type */
766 struct list_head block_groups[BTRFS_NR_RAID_TYPES];
767 spinlock_t lock;
768 struct rw_semaphore groups_sem;
769 wait_queue_head_t wait;
770};
771
772struct btrfs_block_rsv {
773 u64 size;
774 u64 reserved;
775 u64 freed[2];
776 struct btrfs_space_info *space_info;
777 struct list_head list;
778 spinlock_t lock;
779 atomic_t usage;
780 unsigned int priority:8;
781 unsigned int durable:1;
782 unsigned int refill_used:1;
783 unsigned int full:1;
784};
785
786/*
787 * free clusters are used to claim free space in relatively large chunks,
788 * allowing us to do less seeky writes. They are used for all metadata
789 * allocations and data allocations in ssd mode.
790 */
791struct btrfs_free_cluster {
792 spinlock_t lock;
793 spinlock_t refill_lock;
794 struct rb_root root;
795
796 /* largest extent in this cluster */
797 u64 max_size;
798
799 /* first extent starting offset */
800 u64 window_start;
801
802 struct btrfs_block_group_cache *block_group;
803 /*
804 * when a cluster is allocated from a block group, we put the
805 * cluster onto a list in the block group so that it can
806 * be freed before the block group is freed.
807 */
808 struct list_head block_group_list;
809};
810
811enum btrfs_caching_type {
812 BTRFS_CACHE_NO = 0,
813 BTRFS_CACHE_STARTED = 1,
814 BTRFS_CACHE_FINISHED = 2,
815};
816
817enum btrfs_disk_cache_state {
818 BTRFS_DC_WRITTEN = 0,
819 BTRFS_DC_ERROR = 1,
820 BTRFS_DC_CLEAR = 2,
821 BTRFS_DC_SETUP = 3,
822 BTRFS_DC_NEED_WRITE = 4,
823};
824
825struct btrfs_caching_control {
826 struct list_head list;
827 struct mutex mutex;
828 wait_queue_head_t wait;
829 struct btrfs_work work;
830 struct btrfs_block_group_cache *block_group;
831 u64 progress;
832 atomic_t count;
833};
834
835struct btrfs_block_group_cache {
836 struct btrfs_key key;
837 struct btrfs_block_group_item item;
838 struct btrfs_fs_info *fs_info;
839 struct inode *inode;
840 spinlock_t lock;
841 u64 pinned;
842 u64 reserved;
843 u64 reserved_pinned;
844 u64 bytes_super;
845 u64 flags;
846 u64 sectorsize;
847 unsigned int ro:1;
848 unsigned int dirty:1;
849 unsigned int iref:1;
850
851 int disk_cache_state;
852
853 /* cache tracking stuff */
854 int cached;
855 struct btrfs_caching_control *caching_ctl;
856 u64 last_byte_to_unpin;
857
858 struct btrfs_space_info *space_info;
859
860 /* free space cache stuff */
861 struct btrfs_free_space_ctl *free_space_ctl;
862
863 /* block group cache stuff */
864 struct rb_node cache_node;
865
866 /* for block groups in the same raid type */
867 struct list_head list;
868
869 /* usage count */
870 atomic_t count;
871
872 /* List of struct btrfs_free_clusters for this block group.
873 * Today it will only have one thing on it, but that may change
874 */
875 struct list_head cluster_list;
876};
877
878struct reloc_control;
879struct btrfs_device;
880struct btrfs_fs_devices;
881struct btrfs_delayed_root;
882struct btrfs_fs_info {
883 u8 fsid[BTRFS_FSID_SIZE];
884 u8 chunk_tree_uuid[BTRFS_UUID_SIZE];
885 struct btrfs_root *extent_root;
886 struct btrfs_root *tree_root;
887 struct btrfs_root *chunk_root;
888 struct btrfs_root *dev_root;
889 struct btrfs_root *fs_root;
890 struct btrfs_root *csum_root;
891
892 /* the log root tree is a directory of all the other log roots */
893 struct btrfs_root *log_root_tree;
894
895 spinlock_t fs_roots_radix_lock;
896 struct radix_tree_root fs_roots_radix;
897
898 /* block group cache stuff */
899 spinlock_t block_group_cache_lock;
900 struct rb_root block_group_cache_tree;
901
902 struct extent_io_tree freed_extents[2];
903 struct extent_io_tree *pinned_extents;
904
905 /* logical->physical extent mapping */
906 struct btrfs_mapping_tree mapping_tree;
907
908 /*
909 * block reservation for extent, checksum, root tree and
910 * delayed dir index item
911 */
912 struct btrfs_block_rsv global_block_rsv;
913 /* block reservation for delay allocation */
914 struct btrfs_block_rsv delalloc_block_rsv;
915 /* block reservation for metadata operations */
916 struct btrfs_block_rsv trans_block_rsv;
917 /* block reservation for chunk tree */
918 struct btrfs_block_rsv chunk_block_rsv;
919
920 struct btrfs_block_rsv empty_block_rsv;
921
922 /* list of block reservations that cross multiple transactions */
923 struct list_head durable_block_rsv_list;
924
925 struct mutex durable_block_rsv_mutex;
926
927 u64 generation;
928 u64 last_trans_committed;
929
930 /*
931 * this is updated to the current trans every time a full commit
932 * is required instead of the faster short fsync log commits
933 */
934 u64 last_trans_log_full_commit;
935 unsigned long mount_opt:20;
936 unsigned long compress_type:4;
937 u64 max_inline;
938 u64 alloc_start;
939 struct btrfs_transaction *running_transaction;
940 wait_queue_head_t transaction_throttle;
941 wait_queue_head_t transaction_wait;
942 wait_queue_head_t transaction_blocked_wait;
943 wait_queue_head_t async_submit_wait;
944
945 struct btrfs_super_block super_copy;
946 struct btrfs_super_block super_for_commit;
947 struct block_device *__bdev;
948 struct super_block *sb;
949 struct inode *btree_inode;
950 struct backing_dev_info bdi;
951 struct mutex tree_log_mutex;
952 struct mutex transaction_kthread_mutex;
953 struct mutex cleaner_mutex;
954 struct mutex chunk_mutex;
955 struct mutex volume_mutex;
956 /*
957 * this protects the ordered operations list only while we are
958 * processing all of the entries on it. This way we make
959 * sure the commit code doesn't find the list temporarily empty
960 * because another function happens to be doing non-waiting preflush
961 * before jumping into the main commit.
962 */
963 struct mutex ordered_operations_mutex;
964 struct rw_semaphore extent_commit_sem;
965
966 struct rw_semaphore cleanup_work_sem;
967
968 struct rw_semaphore subvol_sem;
969 struct srcu_struct subvol_srcu;
970
971 spinlock_t trans_lock;
972 /*
973 * the reloc mutex goes with the trans lock, it is taken
974 * during commit to protect us from the relocation code
975 */
976 struct mutex reloc_mutex;
977
978 struct list_head trans_list;
979 struct list_head hashers;
980 struct list_head dead_roots;
981 struct list_head caching_block_groups;
982
983 spinlock_t delayed_iput_lock;
984 struct list_head delayed_iputs;
985
986 atomic_t nr_async_submits;
987 atomic_t async_submit_draining;
988 atomic_t nr_async_bios;
989 atomic_t async_delalloc_pages;
990 atomic_t open_ioctl_trans;
991
992 /*
993 * this is used by the balancing code to wait for all the pending
994 * ordered extents
995 */
996 spinlock_t ordered_extent_lock;
997
998 /*
999 * all of the data=ordered extents pending writeback
1000 * these can span multiple transactions and basically include
1001 * every dirty data page that isn't from nodatacow
1002 */
1003 struct list_head ordered_extents;
1004
1005 /*
1006 * all of the inodes that have delalloc bytes. It is possible for
1007 * this list to be empty even when there is still dirty data=ordered
1008 * extents waiting to finish IO.
1009 */
1010 struct list_head delalloc_inodes;
1011
1012 /*
1013 * special rename and truncate targets that must be on disk before
1014 * we're allowed to commit. This is basically the ext3 style
1015 * data=ordered list.
1016 */
1017 struct list_head ordered_operations;
1018
1019 /*
1020 * there is a pool of worker threads for checksumming during writes
1021 * and a pool for checksumming after reads. This is because readers
1022 * can run with FS locks held, and the writers may be waiting for
1023 * those locks. We don't want ordering in the pending list to cause
1024 * deadlocks, and so the two are serviced separately.
1025 *
1026 * A third pool does submit_bio to avoid deadlocking with the other
1027 * two
1028 */
1029 struct btrfs_workers generic_worker;
1030 struct btrfs_workers workers;
1031 struct btrfs_workers delalloc_workers;
1032 struct btrfs_workers endio_workers;
1033 struct btrfs_workers endio_meta_workers;
1034 struct btrfs_workers endio_meta_write_workers;
1035 struct btrfs_workers endio_write_workers;
1036 struct btrfs_workers endio_freespace_worker;
1037 struct btrfs_workers submit_workers;
1038 struct btrfs_workers caching_workers;
1039
1040 /*
1041 * fixup workers take dirty pages that didn't properly go through
1042 * the cow mechanism and make them safe to write. It happens
1043 * for the sys_munmap function call path
1044 */
1045 struct btrfs_workers fixup_workers;
1046 struct btrfs_workers delayed_workers;
1047 struct task_struct *transaction_kthread;
1048 struct task_struct *cleaner_kthread;
1049 int thread_pool_size;
1050
1051 struct kobject super_kobj;
1052 struct completion kobj_unregister;
1053 int do_barriers;
1054 int closing;
1055 int log_root_recovering;
1056 int enospc_unlink;
1057 int trans_no_join;
1058
1059 u64 total_pinned;
1060
1061 /* protected by the delalloc lock, used to keep from writing
1062 * metadata until there is a nice batch
1063 */
1064 u64 dirty_metadata_bytes;
1065 struct list_head dirty_cowonly_roots;
1066
1067 struct btrfs_fs_devices *fs_devices;
1068
1069 /*
1070 * the space_info list is almost entirely read only. It only changes
1071 * when we add a new raid type to the FS, and that happens
1072 * very rarely. RCU is used to protect it.
1073 */
1074 struct list_head space_info;
1075
1076 struct reloc_control *reloc_ctl;
1077
1078 spinlock_t delalloc_lock;
1079 u64 delalloc_bytes;
1080
1081 /* data_alloc_cluster is only used in ssd mode */
1082 struct btrfs_free_cluster data_alloc_cluster;
1083
1084 /* all metadata allocations go through this cluster */
1085 struct btrfs_free_cluster meta_alloc_cluster;
1086
1087 /* auto defrag inodes go here */
1088 spinlock_t defrag_inodes_lock;
1089 struct rb_root defrag_inodes;
1090 atomic_t defrag_running;
1091
1092 spinlock_t ref_cache_lock;
1093 u64 total_ref_cache_size;
1094
1095 u64 avail_data_alloc_bits;
1096 u64 avail_metadata_alloc_bits;
1097 u64 avail_system_alloc_bits;
1098 u64 data_alloc_profile;
1099 u64 metadata_alloc_profile;
1100 u64 system_alloc_profile;
1101
1102 unsigned data_chunk_allocations;
1103 unsigned metadata_ratio;
1104
1105 void *bdev_holder;
1106
1107 /* private scrub information */
1108 struct mutex scrub_lock;
1109 atomic_t scrubs_running;
1110 atomic_t scrub_pause_req;
1111 atomic_t scrubs_paused;
1112 atomic_t scrub_cancel_req;
1113 wait_queue_head_t scrub_pause_wait;
1114 struct rw_semaphore scrub_super_lock;
1115 int scrub_workers_refcnt;
1116 struct btrfs_workers scrub_workers;
1117
1118 /* filesystem state */
1119 u64 fs_state;
1120
1121 struct btrfs_delayed_root *delayed_root;
1122};
1123
1124/*
1125 * in ram representation of the tree. extent_root is used for all allocations
1126 * and for the extent tree extent_root root.
1127 */
1128struct btrfs_root {
1129 struct extent_buffer *node;
1130
1131 struct extent_buffer *commit_root;
1132 struct btrfs_root *log_root;
1133 struct btrfs_root *reloc_root;
1134
1135 struct btrfs_root_item root_item;
1136 struct btrfs_key root_key;
1137 struct btrfs_fs_info *fs_info;
1138 struct extent_io_tree dirty_log_pages;
1139
1140 struct kobject root_kobj;
1141 struct completion kobj_unregister;
1142 struct mutex objectid_mutex;
1143
1144 spinlock_t accounting_lock;
1145 struct btrfs_block_rsv *block_rsv;
1146
1147 /* free ino cache stuff */
1148 struct mutex fs_commit_mutex;
1149 struct btrfs_free_space_ctl *free_ino_ctl;
1150 enum btrfs_caching_type cached;
1151 spinlock_t cache_lock;
1152 wait_queue_head_t cache_wait;
1153 struct btrfs_free_space_ctl *free_ino_pinned;
1154 u64 cache_progress;
1155 struct inode *cache_inode;
1156
1157 struct mutex log_mutex;
1158 wait_queue_head_t log_writer_wait;
1159 wait_queue_head_t log_commit_wait[2];
1160 atomic_t log_writers;
1161 atomic_t log_commit[2];
1162 unsigned long log_transid;
1163 unsigned long last_log_commit;
1164 unsigned long log_batch;
1165 pid_t log_start_pid;
1166 bool log_multiple_pids;
1167
1168 u64 objectid;
1169 u64 last_trans;
1170
1171 /* data allocations are done in sectorsize units */
1172 u32 sectorsize;
1173
1174 /* node allocations are done in nodesize units */
1175 u32 nodesize;
1176
1177 /* leaf allocations are done in leafsize units */
1178 u32 leafsize;
1179
1180 u32 stripesize;
1181
1182 u32 type;
1183
1184 u64 highest_objectid;
1185
1186 /* btrfs_record_root_in_trans is a multi-step process,
1187 * and it can race with the balancing code. But the
1188 * race is very small, and only the first time the root
1189 * is added to each transaction. So in_trans_setup
1190 * is used to tell us when more checks are required
1191 */
1192 unsigned long in_trans_setup;
1193 int ref_cows;
1194 int track_dirty;
1195 int in_radix;
1196
1197 u64 defrag_trans_start;
1198 struct btrfs_key defrag_progress;
1199 struct btrfs_key defrag_max;
1200 int defrag_running;
1201 char *name;
1202
1203 /* the dirty list is only used by non-reference counted roots */
1204 struct list_head dirty_list;
1205
1206 struct list_head root_list;
1207
1208 spinlock_t orphan_lock;
1209 struct list_head orphan_list;
1210 struct btrfs_block_rsv *orphan_block_rsv;
1211 int orphan_item_inserted;
1212 int orphan_cleanup_state;
1213
1214 spinlock_t inode_lock;
1215 /* red-black tree that keeps track of in-memory inodes */
1216 struct rb_root inode_tree;
1217
1218 /*
1219 * radix tree that keeps track of delayed nodes of every inode,
1220 * protected by inode_lock
1221 */
1222 struct radix_tree_root delayed_nodes_tree;
1223 /*
1224 * right now this just gets used so that a root has its own devid
1225 * for stat. It may be used for more later
1226 */
1227 dev_t anon_dev;
1228};
1229
1230struct btrfs_ioctl_defrag_range_args {
1231 /* start of the defrag operation */
1232 __u64 start;
1233
1234 /* number of bytes to defrag, use (u64)-1 to say all */
1235 __u64 len;
1236
1237 /*
1238 * flags for the operation, which can include turning
1239 * on compression for this one defrag
1240 */
1241 __u64 flags;
1242
1243 /*
1244 * any extent bigger than this will be considered
1245 * already defragged. Use 0 to take the kernel default
1246 * Use 1 to say every single extent must be rewritten
1247 */
1248 __u32 extent_thresh;
1249
1250 /*
1251 * which compression method to use if turning on compression
1252 * for this defrag operation. If unspecified, zlib will
1253 * be used
1254 */
1255 __u32 compress_type;
1256
1257 /* spare for later */
1258 __u32 unused[4];
1259};
1260
1261
1262/*
1263 * inode items have the data typically returned from stat and store other
1264 * info about object characteristics. There is one for every file and dir in
1265 * the FS
1266 */
1267#define BTRFS_INODE_ITEM_KEY 1
1268#define BTRFS_INODE_REF_KEY 12
1269#define BTRFS_XATTR_ITEM_KEY 24
1270#define BTRFS_ORPHAN_ITEM_KEY 48
1271/* reserve 2-15 close to the inode for later flexibility */
1272
1273/*
1274 * dir items are the name -> inode pointers in a directory. There is one
1275 * for every name in a directory.
1276 */
1277#define BTRFS_DIR_LOG_ITEM_KEY 60
1278#define BTRFS_DIR_LOG_INDEX_KEY 72
1279#define BTRFS_DIR_ITEM_KEY 84
1280#define BTRFS_DIR_INDEX_KEY 96
1281/*
1282 * extent data is for file data
1283 */
1284#define BTRFS_EXTENT_DATA_KEY 108
1285
1286/*
1287 * extent csums are stored in a separate tree and hold csums for
1288 * an entire extent on disk.
1289 */
1290#define BTRFS_EXTENT_CSUM_KEY 128
1291
1292/*
1293 * root items point to tree roots. They are typically in the root
1294 * tree used by the super block to find all the other trees
1295 */
1296#define BTRFS_ROOT_ITEM_KEY 132
1297
1298/*
1299 * root backrefs tie subvols and snapshots to the directory entries that
1300 * reference them
1301 */
1302#define BTRFS_ROOT_BACKREF_KEY 144
1303
1304/*
1305 * root refs make a fast index for listing all of the snapshots and
1306 * subvolumes referenced by a given root. They point directly to the
1307 * directory item in the root that references the subvol
1308 */
1309#define BTRFS_ROOT_REF_KEY 156
1310
1311/*
1312 * extent items are in the extent map tree. These record which blocks
1313 * are used, and how many references there are to each block
1314 */
1315#define BTRFS_EXTENT_ITEM_KEY 168
1316
1317#define BTRFS_TREE_BLOCK_REF_KEY 176
1318
1319#define BTRFS_EXTENT_DATA_REF_KEY 178
1320
1321#define BTRFS_EXTENT_REF_V0_KEY 180
1322
1323#define BTRFS_SHARED_BLOCK_REF_KEY 182
1324
1325#define BTRFS_SHARED_DATA_REF_KEY 184
1326
1327/*
1328 * block groups give us hints into the extent allocation trees. Which
1329 * blocks are free etc etc
1330 */
1331#define BTRFS_BLOCK_GROUP_ITEM_KEY 192
1332
1333#define BTRFS_DEV_EXTENT_KEY 204
1334#define BTRFS_DEV_ITEM_KEY 216
1335#define BTRFS_CHUNK_ITEM_KEY 228
1336
1337/*
1338 * string items are for debugging. They just store a short string of
1339 * data in the FS
1340 */
1341#define BTRFS_STRING_ITEM_KEY 253
1342
1343/*
1344 * Flags for mount options.
1345 *
1346 * Note: don't forget to add new options to btrfs_show_options()
1347 */
1348#define BTRFS_MOUNT_NODATASUM (1 << 0)
1349#define BTRFS_MOUNT_NODATACOW (1 << 1)
1350#define BTRFS_MOUNT_NOBARRIER (1 << 2)
1351#define BTRFS_MOUNT_SSD (1 << 3)
1352#define BTRFS_MOUNT_DEGRADED (1 << 4)
1353#define BTRFS_MOUNT_COMPRESS (1 << 5)
1354#define BTRFS_MOUNT_NOTREELOG (1 << 6)
1355#define BTRFS_MOUNT_FLUSHONCOMMIT (1 << 7)
1356#define BTRFS_MOUNT_SSD_SPREAD (1 << 8)
1357#define BTRFS_MOUNT_NOSSD (1 << 9)
1358#define BTRFS_MOUNT_DISCARD (1 << 10)
1359#define BTRFS_MOUNT_FORCE_COMPRESS (1 << 11)
1360#define BTRFS_MOUNT_SPACE_CACHE (1 << 12)
1361#define BTRFS_MOUNT_CLEAR_CACHE (1 << 13)
1362#define BTRFS_MOUNT_USER_SUBVOL_RM_ALLOWED (1 << 14)
1363#define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15)
1364#define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16)
1365#define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17)
1366
1367#define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
1368#define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
1369#define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
1370 BTRFS_MOUNT_##opt)
1371/*
1372 * Inode flags
1373 */
1374#define BTRFS_INODE_NODATASUM (1 << 0)
1375#define BTRFS_INODE_NODATACOW (1 << 1)
1376#define BTRFS_INODE_READONLY (1 << 2)
1377#define BTRFS_INODE_NOCOMPRESS (1 << 3)
1378#define BTRFS_INODE_PREALLOC (1 << 4)
1379#define BTRFS_INODE_SYNC (1 << 5)
1380#define BTRFS_INODE_IMMUTABLE (1 << 6)
1381#define BTRFS_INODE_APPEND (1 << 7)
1382#define BTRFS_INODE_NODUMP (1 << 8)
1383#define BTRFS_INODE_NOATIME (1 << 9)
1384#define BTRFS_INODE_DIRSYNC (1 << 10)
1385#define BTRFS_INODE_COMPRESS (1 << 11)
1386
1387#define BTRFS_INODE_ROOT_ITEM_INIT (1 << 31)
1388
1389/* some macros to generate set/get funcs for the struct fields. This
1390 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
1391 * one for u8:
1392 */
1393#define le8_to_cpu(v) (v)
1394#define cpu_to_le8(v) (v)
1395#define __le8 u8
1396
1397#define read_eb_member(eb, ptr, type, member, result) ( \
1398 read_extent_buffer(eb, (char *)(result), \
1399 ((unsigned long)(ptr)) + \
1400 offsetof(type, member), \
1401 sizeof(((type *)0)->member)))
1402
1403#define write_eb_member(eb, ptr, type, member, result) ( \
1404 write_extent_buffer(eb, (char *)(result), \
1405 ((unsigned long)(ptr)) + \
1406 offsetof(type, member), \
1407 sizeof(((type *)0)->member)))
1408
1409#ifndef BTRFS_SETGET_FUNCS
1410#define BTRFS_SETGET_FUNCS(name, type, member, bits) \
1411u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
1412void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
1413#endif
1414
1415#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
1416static inline u##bits btrfs_##name(struct extent_buffer *eb) \
1417{ \
1418 type *p = page_address(eb->first_page); \
1419 u##bits res = le##bits##_to_cpu(p->member); \
1420 return res; \
1421} \
1422static inline void btrfs_set_##name(struct extent_buffer *eb, \
1423 u##bits val) \
1424{ \
1425 type *p = page_address(eb->first_page); \
1426 p->member = cpu_to_le##bits(val); \
1427}
1428
1429#define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
1430static inline u##bits btrfs_##name(type *s) \
1431{ \
1432 return le##bits##_to_cpu(s->member); \
1433} \
1434static inline void btrfs_set_##name(type *s, u##bits val) \
1435{ \
1436 s->member = cpu_to_le##bits(val); \
1437}
1438
1439BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
1440BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
1441BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
1442BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
1443BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
1444BTRFS_SETGET_FUNCS(device_start_offset, struct btrfs_dev_item,
1445 start_offset, 64);
1446BTRFS_SETGET_FUNCS(device_sector_size, struct btrfs_dev_item, sector_size, 32);
1447BTRFS_SETGET_FUNCS(device_id, struct btrfs_dev_item, devid, 64);
1448BTRFS_SETGET_FUNCS(device_group, struct btrfs_dev_item, dev_group, 32);
1449BTRFS_SETGET_FUNCS(device_seek_speed, struct btrfs_dev_item, seek_speed, 8);
1450BTRFS_SETGET_FUNCS(device_bandwidth, struct btrfs_dev_item, bandwidth, 8);
1451BTRFS_SETGET_FUNCS(device_generation, struct btrfs_dev_item, generation, 64);
1452
1453BTRFS_SETGET_STACK_FUNCS(stack_device_type, struct btrfs_dev_item, type, 64);
1454BTRFS_SETGET_STACK_FUNCS(stack_device_total_bytes, struct btrfs_dev_item,
1455 total_bytes, 64);
1456BTRFS_SETGET_STACK_FUNCS(stack_device_bytes_used, struct btrfs_dev_item,
1457 bytes_used, 64);
1458BTRFS_SETGET_STACK_FUNCS(stack_device_io_align, struct btrfs_dev_item,
1459 io_align, 32);
1460BTRFS_SETGET_STACK_FUNCS(stack_device_io_width, struct btrfs_dev_item,
1461 io_width, 32);
1462BTRFS_SETGET_STACK_FUNCS(stack_device_sector_size, struct btrfs_dev_item,
1463 sector_size, 32);
1464BTRFS_SETGET_STACK_FUNCS(stack_device_id, struct btrfs_dev_item, devid, 64);
1465BTRFS_SETGET_STACK_FUNCS(stack_device_group, struct btrfs_dev_item,
1466 dev_group, 32);
1467BTRFS_SETGET_STACK_FUNCS(stack_device_seek_speed, struct btrfs_dev_item,
1468 seek_speed, 8);
1469BTRFS_SETGET_STACK_FUNCS(stack_device_bandwidth, struct btrfs_dev_item,
1470 bandwidth, 8);
1471BTRFS_SETGET_STACK_FUNCS(stack_device_generation, struct btrfs_dev_item,
1472 generation, 64);
1473
1474static inline char *btrfs_device_uuid(struct btrfs_dev_item *d)
1475{
1476 return (char *)d + offsetof(struct btrfs_dev_item, uuid);
1477}
1478
1479static inline char *btrfs_device_fsid(struct btrfs_dev_item *d)
1480{
1481 return (char *)d + offsetof(struct btrfs_dev_item, fsid);
1482}
1483
1484BTRFS_SETGET_FUNCS(chunk_length, struct btrfs_chunk, length, 64);
1485BTRFS_SETGET_FUNCS(chunk_owner, struct btrfs_chunk, owner, 64);
1486BTRFS_SETGET_FUNCS(chunk_stripe_len, struct btrfs_chunk, stripe_len, 64);
1487BTRFS_SETGET_FUNCS(chunk_io_align, struct btrfs_chunk, io_align, 32);
1488BTRFS_SETGET_FUNCS(chunk_io_width, struct btrfs_chunk, io_width, 32);
1489BTRFS_SETGET_FUNCS(chunk_sector_size, struct btrfs_chunk, sector_size, 32);
1490BTRFS_SETGET_FUNCS(chunk_type, struct btrfs_chunk, type, 64);
1491BTRFS_SETGET_FUNCS(chunk_num_stripes, struct btrfs_chunk, num_stripes, 16);
1492BTRFS_SETGET_FUNCS(chunk_sub_stripes, struct btrfs_chunk, sub_stripes, 16);
1493BTRFS_SETGET_FUNCS(stripe_devid, struct btrfs_stripe, devid, 64);
1494BTRFS_SETGET_FUNCS(stripe_offset, struct btrfs_stripe, offset, 64);
1495
1496static inline char *btrfs_stripe_dev_uuid(struct btrfs_stripe *s)
1497{
1498 return (char *)s + offsetof(struct btrfs_stripe, dev_uuid);
1499}
1500
1501BTRFS_SETGET_STACK_FUNCS(stack_chunk_length, struct btrfs_chunk, length, 64);
1502BTRFS_SETGET_STACK_FUNCS(stack_chunk_owner, struct btrfs_chunk, owner, 64);
1503BTRFS_SETGET_STACK_FUNCS(stack_chunk_stripe_len, struct btrfs_chunk,
1504 stripe_len, 64);
1505BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_align, struct btrfs_chunk,
1506 io_align, 32);
1507BTRFS_SETGET_STACK_FUNCS(stack_chunk_io_width, struct btrfs_chunk,
1508 io_width, 32);
1509BTRFS_SETGET_STACK_FUNCS(stack_chunk_sector_size, struct btrfs_chunk,
1510 sector_size, 32);
1511BTRFS_SETGET_STACK_FUNCS(stack_chunk_type, struct btrfs_chunk, type, 64);
1512BTRFS_SETGET_STACK_FUNCS(stack_chunk_num_stripes, struct btrfs_chunk,
1513 num_stripes, 16);
1514BTRFS_SETGET_STACK_FUNCS(stack_chunk_sub_stripes, struct btrfs_chunk,
1515 sub_stripes, 16);
1516BTRFS_SETGET_STACK_FUNCS(stack_stripe_devid, struct btrfs_stripe, devid, 64);
1517BTRFS_SETGET_STACK_FUNCS(stack_stripe_offset, struct btrfs_stripe, offset, 64);
1518
1519static inline struct btrfs_stripe *btrfs_stripe_nr(struct btrfs_chunk *c,
1520 int nr)
1521{
1522 unsigned long offset = (unsigned long)c;
1523 offset += offsetof(struct btrfs_chunk, stripe);
1524 offset += nr * sizeof(struct btrfs_stripe);
1525 return (struct btrfs_stripe *)offset;
1526}
1527
1528static inline char *btrfs_stripe_dev_uuid_nr(struct btrfs_chunk *c, int nr)
1529{
1530 return btrfs_stripe_dev_uuid(btrfs_stripe_nr(c, nr));
1531}
1532
1533static inline u64 btrfs_stripe_offset_nr(struct extent_buffer *eb,
1534 struct btrfs_chunk *c, int nr)
1535{
1536 return btrfs_stripe_offset(eb, btrfs_stripe_nr(c, nr));
1537}
1538
1539static inline u64 btrfs_stripe_devid_nr(struct extent_buffer *eb,
1540 struct btrfs_chunk *c, int nr)
1541{
1542 return btrfs_stripe_devid(eb, btrfs_stripe_nr(c, nr));
1543}
1544
1545/* struct btrfs_block_group_item */
1546BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
1547 used, 64);
1548BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
1549 used, 64);
1550BTRFS_SETGET_STACK_FUNCS(block_group_chunk_objectid,
1551 struct btrfs_block_group_item, chunk_objectid, 64);
1552
1553BTRFS_SETGET_FUNCS(disk_block_group_chunk_objectid,
1554 struct btrfs_block_group_item, chunk_objectid, 64);
1555BTRFS_SETGET_FUNCS(disk_block_group_flags,
1556 struct btrfs_block_group_item, flags, 64);
1557BTRFS_SETGET_STACK_FUNCS(block_group_flags,
1558 struct btrfs_block_group_item, flags, 64);
1559
1560/* struct btrfs_inode_ref */
1561BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
1562BTRFS_SETGET_FUNCS(inode_ref_index, struct btrfs_inode_ref, index, 64);
1563
1564/* struct btrfs_inode_item */
1565BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
1566BTRFS_SETGET_FUNCS(inode_sequence, struct btrfs_inode_item, sequence, 64);
1567BTRFS_SETGET_FUNCS(inode_transid, struct btrfs_inode_item, transid, 64);
1568BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
1569BTRFS_SETGET_FUNCS(inode_nbytes, struct btrfs_inode_item, nbytes, 64);
1570BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
1571BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
1572BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
1573BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
1574BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
1575BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 64);
1576BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 64);
1577
1578static inline struct btrfs_timespec *
1579btrfs_inode_atime(struct btrfs_inode_item *inode_item)
1580{
1581 unsigned long ptr = (unsigned long)inode_item;
1582 ptr += offsetof(struct btrfs_inode_item, atime);
1583 return (struct btrfs_timespec *)ptr;
1584}
1585
1586static inline struct btrfs_timespec *
1587btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
1588{
1589 unsigned long ptr = (unsigned long)inode_item;
1590 ptr += offsetof(struct btrfs_inode_item, mtime);
1591 return (struct btrfs_timespec *)ptr;
1592}
1593
1594static inline struct btrfs_timespec *
1595btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
1596{
1597 unsigned long ptr = (unsigned long)inode_item;
1598 ptr += offsetof(struct btrfs_inode_item, ctime);
1599 return (struct btrfs_timespec *)ptr;
1600}
1601
1602BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_timespec, sec, 64);
1603BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_timespec, nsec, 32);
1604
1605/* struct btrfs_dev_extent */
1606BTRFS_SETGET_FUNCS(dev_extent_chunk_tree, struct btrfs_dev_extent,
1607 chunk_tree, 64);
1608BTRFS_SETGET_FUNCS(dev_extent_chunk_objectid, struct btrfs_dev_extent,
1609 chunk_objectid, 64);
1610BTRFS_SETGET_FUNCS(dev_extent_chunk_offset, struct btrfs_dev_extent,
1611 chunk_offset, 64);
1612BTRFS_SETGET_FUNCS(dev_extent_length, struct btrfs_dev_extent, length, 64);
1613
1614static inline u8 *btrfs_dev_extent_chunk_tree_uuid(struct btrfs_dev_extent *dev)
1615{
1616 unsigned long ptr = offsetof(struct btrfs_dev_extent, chunk_tree_uuid);
1617 return (u8 *)((unsigned long)dev + ptr);
1618}
1619
1620BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 64);
1621BTRFS_SETGET_FUNCS(extent_generation, struct btrfs_extent_item,
1622 generation, 64);
1623BTRFS_SETGET_FUNCS(extent_flags, struct btrfs_extent_item, flags, 64);
1624
1625BTRFS_SETGET_FUNCS(extent_refs_v0, struct btrfs_extent_item_v0, refs, 32);
1626
1627
1628BTRFS_SETGET_FUNCS(tree_block_level, struct btrfs_tree_block_info, level, 8);
1629
1630static inline void btrfs_tree_block_key(struct extent_buffer *eb,
1631 struct btrfs_tree_block_info *item,
1632 struct btrfs_disk_key *key)
1633{
1634 read_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1635}
1636
1637static inline void btrfs_set_tree_block_key(struct extent_buffer *eb,
1638 struct btrfs_tree_block_info *item,
1639 struct btrfs_disk_key *key)
1640{
1641 write_eb_member(eb, item, struct btrfs_tree_block_info, key, key);
1642}
1643
1644BTRFS_SETGET_FUNCS(extent_data_ref_root, struct btrfs_extent_data_ref,
1645 root, 64);
1646BTRFS_SETGET_FUNCS(extent_data_ref_objectid, struct btrfs_extent_data_ref,
1647 objectid, 64);
1648BTRFS_SETGET_FUNCS(extent_data_ref_offset, struct btrfs_extent_data_ref,
1649 offset, 64);
1650BTRFS_SETGET_FUNCS(extent_data_ref_count, struct btrfs_extent_data_ref,
1651 count, 32);
1652
1653BTRFS_SETGET_FUNCS(shared_data_ref_count, struct btrfs_shared_data_ref,
1654 count, 32);
1655
1656BTRFS_SETGET_FUNCS(extent_inline_ref_type, struct btrfs_extent_inline_ref,
1657 type, 8);
1658BTRFS_SETGET_FUNCS(extent_inline_ref_offset, struct btrfs_extent_inline_ref,
1659 offset, 64);
1660
1661static inline u32 btrfs_extent_inline_ref_size(int type)
1662{
1663 if (type == BTRFS_TREE_BLOCK_REF_KEY ||
1664 type == BTRFS_SHARED_BLOCK_REF_KEY)
1665 return sizeof(struct btrfs_extent_inline_ref);
1666 if (type == BTRFS_SHARED_DATA_REF_KEY)
1667 return sizeof(struct btrfs_shared_data_ref) +
1668 sizeof(struct btrfs_extent_inline_ref);
1669 if (type == BTRFS_EXTENT_DATA_REF_KEY)
1670 return sizeof(struct btrfs_extent_data_ref) +
1671 offsetof(struct btrfs_extent_inline_ref, offset);
1672 BUG();
1673 return 0;
1674}
1675
1676BTRFS_SETGET_FUNCS(ref_root_v0, struct btrfs_extent_ref_v0, root, 64);
1677BTRFS_SETGET_FUNCS(ref_generation_v0, struct btrfs_extent_ref_v0,
1678 generation, 64);
1679BTRFS_SETGET_FUNCS(ref_objectid_v0, struct btrfs_extent_ref_v0, objectid, 64);
1680BTRFS_SETGET_FUNCS(ref_count_v0, struct btrfs_extent_ref_v0, count, 32);
1681
1682/* struct btrfs_node */
1683BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
1684BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
1685
1686static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
1687{
1688 unsigned long ptr;
1689 ptr = offsetof(struct btrfs_node, ptrs) +
1690 sizeof(struct btrfs_key_ptr) * nr;
1691 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
1692}
1693
1694static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
1695 int nr, u64 val)
1696{
1697 unsigned long ptr;
1698 ptr = offsetof(struct btrfs_node, ptrs) +
1699 sizeof(struct btrfs_key_ptr) * nr;
1700 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
1701}
1702
1703static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
1704{
1705 unsigned long ptr;
1706 ptr = offsetof(struct btrfs_node, ptrs) +
1707 sizeof(struct btrfs_key_ptr) * nr;
1708 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
1709}
1710
1711static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
1712 int nr, u64 val)
1713{
1714 unsigned long ptr;
1715 ptr = offsetof(struct btrfs_node, ptrs) +
1716 sizeof(struct btrfs_key_ptr) * nr;
1717 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
1718}
1719
1720static inline unsigned long btrfs_node_key_ptr_offset(int nr)
1721{
1722 return offsetof(struct btrfs_node, ptrs) +
1723 sizeof(struct btrfs_key_ptr) * nr;
1724}
1725
1726void btrfs_node_key(struct extent_buffer *eb,
1727 struct btrfs_disk_key *disk_key, int nr);
1728
1729static inline void btrfs_set_node_key(struct extent_buffer *eb,
1730 struct btrfs_disk_key *disk_key, int nr)
1731{
1732 unsigned long ptr;
1733 ptr = btrfs_node_key_ptr_offset(nr);
1734 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
1735 struct btrfs_key_ptr, key, disk_key);
1736}
1737
1738/* struct btrfs_item */
1739BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
1740BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
1741
1742static inline unsigned long btrfs_item_nr_offset(int nr)
1743{
1744 return offsetof(struct btrfs_leaf, items) +
1745 sizeof(struct btrfs_item) * nr;
1746}
1747
1748static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
1749 int nr)
1750{
1751 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
1752}
1753
1754static inline u32 btrfs_item_end(struct extent_buffer *eb,
1755 struct btrfs_item *item)
1756{
1757 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
1758}
1759
1760static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
1761{
1762 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
1763}
1764
1765static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
1766{
1767 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
1768}
1769
1770static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
1771{
1772 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
1773}
1774
1775static inline void btrfs_item_key(struct extent_buffer *eb,
1776 struct btrfs_disk_key *disk_key, int nr)
1777{
1778 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1779 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
1780}
1781
1782static inline void btrfs_set_item_key(struct extent_buffer *eb,
1783 struct btrfs_disk_key *disk_key, int nr)
1784{
1785 struct btrfs_item *item = btrfs_item_nr(eb, nr);
1786 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
1787}
1788
1789BTRFS_SETGET_FUNCS(dir_log_end, struct btrfs_dir_log_item, end, 64);
1790
1791/*
1792 * struct btrfs_root_ref
1793 */
1794BTRFS_SETGET_FUNCS(root_ref_dirid, struct btrfs_root_ref, dirid, 64);
1795BTRFS_SETGET_FUNCS(root_ref_sequence, struct btrfs_root_ref, sequence, 64);
1796BTRFS_SETGET_FUNCS(root_ref_name_len, struct btrfs_root_ref, name_len, 16);
1797
1798/* struct btrfs_dir_item */
1799BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
1800BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
1801BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
1802BTRFS_SETGET_FUNCS(dir_transid, struct btrfs_dir_item, transid, 64);
1803
1804static inline void btrfs_dir_item_key(struct extent_buffer *eb,
1805 struct btrfs_dir_item *item,
1806 struct btrfs_disk_key *key)
1807{
1808 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
1809}
1810
1811static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
1812 struct btrfs_dir_item *item,
1813 struct btrfs_disk_key *key)
1814{
1815 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
1816}
1817
1818BTRFS_SETGET_FUNCS(free_space_entries, struct btrfs_free_space_header,
1819 num_entries, 64);
1820BTRFS_SETGET_FUNCS(free_space_bitmaps, struct btrfs_free_space_header,
1821 num_bitmaps, 64);
1822BTRFS_SETGET_FUNCS(free_space_generation, struct btrfs_free_space_header,
1823 generation, 64);
1824
1825static inline void btrfs_free_space_key(struct extent_buffer *eb,
1826 struct btrfs_free_space_header *h,
1827 struct btrfs_disk_key *key)
1828{
1829 read_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1830}
1831
1832static inline void btrfs_set_free_space_key(struct extent_buffer *eb,
1833 struct btrfs_free_space_header *h,
1834 struct btrfs_disk_key *key)
1835{
1836 write_eb_member(eb, h, struct btrfs_free_space_header, location, key);
1837}
1838
1839/* struct btrfs_disk_key */
1840BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
1841 objectid, 64);
1842BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
1843BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
1844
1845static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1846 struct btrfs_disk_key *disk)
1847{
1848 cpu->offset = le64_to_cpu(disk->offset);
1849 cpu->type = disk->type;
1850 cpu->objectid = le64_to_cpu(disk->objectid);
1851}
1852
1853static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1854 struct btrfs_key *cpu)
1855{
1856 disk->offset = cpu_to_le64(cpu->offset);
1857 disk->type = cpu->type;
1858 disk->objectid = cpu_to_le64(cpu->objectid);
1859}
1860
1861static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
1862 struct btrfs_key *key, int nr)
1863{
1864 struct btrfs_disk_key disk_key;
1865 btrfs_node_key(eb, &disk_key, nr);
1866 btrfs_disk_key_to_cpu(key, &disk_key);
1867}
1868
1869static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
1870 struct btrfs_key *key, int nr)
1871{
1872 struct btrfs_disk_key disk_key;
1873 btrfs_item_key(eb, &disk_key, nr);
1874 btrfs_disk_key_to_cpu(key, &disk_key);
1875}
1876
1877static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
1878 struct btrfs_dir_item *item,
1879 struct btrfs_key *key)
1880{
1881 struct btrfs_disk_key disk_key;
1882 btrfs_dir_item_key(eb, item, &disk_key);
1883 btrfs_disk_key_to_cpu(key, &disk_key);
1884}
1885
1886
1887static inline u8 btrfs_key_type(struct btrfs_key *key)
1888{
1889 return key->type;
1890}
1891
1892static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
1893{
1894 key->type = val;
1895}
1896
1897/* struct btrfs_header */
1898BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
1899BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
1900 generation, 64);
1901BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
1902BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
1903BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 64);
1904BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
1905
1906static inline int btrfs_header_flag(struct extent_buffer *eb, u64 flag)
1907{
1908 return (btrfs_header_flags(eb) & flag) == flag;
1909}
1910
1911static inline int btrfs_set_header_flag(struct extent_buffer *eb, u64 flag)
1912{
1913 u64 flags = btrfs_header_flags(eb);
1914 btrfs_set_header_flags(eb, flags | flag);
1915 return (flags & flag) == flag;
1916}
1917
1918static inline int btrfs_clear_header_flag(struct extent_buffer *eb, u64 flag)
1919{
1920 u64 flags = btrfs_header_flags(eb);
1921 btrfs_set_header_flags(eb, flags & ~flag);
1922 return (flags & flag) == flag;
1923}
1924
1925static inline int btrfs_header_backref_rev(struct extent_buffer *eb)
1926{
1927 u64 flags = btrfs_header_flags(eb);
1928 return flags >> BTRFS_BACKREF_REV_SHIFT;
1929}
1930
1931static inline void btrfs_set_header_backref_rev(struct extent_buffer *eb,
1932 int rev)
1933{
1934 u64 flags = btrfs_header_flags(eb);
1935 flags &= ~BTRFS_BACKREF_REV_MASK;
1936 flags |= (u64)rev << BTRFS_BACKREF_REV_SHIFT;
1937 btrfs_set_header_flags(eb, flags);
1938}
1939
1940static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
1941{
1942 unsigned long ptr = offsetof(struct btrfs_header, fsid);
1943 return (u8 *)ptr;
1944}
1945
1946static inline u8 *btrfs_header_chunk_tree_uuid(struct extent_buffer *eb)
1947{
1948 unsigned long ptr = offsetof(struct btrfs_header, chunk_tree_uuid);
1949 return (u8 *)ptr;
1950}
1951
1952static inline int btrfs_is_leaf(struct extent_buffer *eb)
1953{
1954 return btrfs_header_level(eb) == 0;
1955}
1956
1957/* struct btrfs_root_item */
1958BTRFS_SETGET_FUNCS(disk_root_generation, struct btrfs_root_item,
1959 generation, 64);
1960BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
1961BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
1962BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
1963
1964BTRFS_SETGET_STACK_FUNCS(root_generation, struct btrfs_root_item,
1965 generation, 64);
1966BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
1967BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
1968BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
1969BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
1970BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 64);
1971BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
1972BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
1973BTRFS_SETGET_STACK_FUNCS(root_last_snapshot, struct btrfs_root_item,
1974 last_snapshot, 64);
1975
1976static inline bool btrfs_root_readonly(struct btrfs_root *root)
1977{
1978 return root->root_item.flags & BTRFS_ROOT_SUBVOL_RDONLY;
1979}
1980
1981/* struct btrfs_super_block */
1982
1983BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
1984BTRFS_SETGET_STACK_FUNCS(super_flags, struct btrfs_super_block, flags, 64);
1985BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
1986 generation, 64);
1987BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
1988BTRFS_SETGET_STACK_FUNCS(super_sys_array_size,
1989 struct btrfs_super_block, sys_chunk_array_size, 32);
1990BTRFS_SETGET_STACK_FUNCS(super_chunk_root_generation,
1991 struct btrfs_super_block, chunk_root_generation, 64);
1992BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
1993 root_level, 8);
1994BTRFS_SETGET_STACK_FUNCS(super_chunk_root, struct btrfs_super_block,
1995 chunk_root, 64);
1996BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
1997 chunk_root_level, 8);
1998BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
1999 log_root, 64);
2000BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
2001 log_root_transid, 64);
2002BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
2003 log_root_level, 8);
2004BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
2005 total_bytes, 64);
2006BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
2007 bytes_used, 64);
2008BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
2009 sectorsize, 32);
2010BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
2011 nodesize, 32);
2012BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
2013 leafsize, 32);
2014BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
2015 stripesize, 32);
2016BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
2017 root_dir_objectid, 64);
2018BTRFS_SETGET_STACK_FUNCS(super_num_devices, struct btrfs_super_block,
2019 num_devices, 64);
2020BTRFS_SETGET_STACK_FUNCS(super_compat_flags, struct btrfs_super_block,
2021 compat_flags, 64);
2022BTRFS_SETGET_STACK_FUNCS(super_compat_ro_flags, struct btrfs_super_block,
2023 compat_ro_flags, 64);
2024BTRFS_SETGET_STACK_FUNCS(super_incompat_flags, struct btrfs_super_block,
2025 incompat_flags, 64);
2026BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
2027 csum_type, 16);
2028BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
2029 cache_generation, 64);
2030
2031static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
2032{
2033 int t = btrfs_super_csum_type(s);
2034 BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
2035 return btrfs_csum_sizes[t];
2036}
2037
2038static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
2039{
2040 return offsetof(struct btrfs_leaf, items);
2041}
2042
2043/* struct btrfs_file_extent_item */
2044BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
2045
2046static inline unsigned long
2047btrfs_file_extent_inline_start(struct btrfs_file_extent_item *e)
2048{
2049 unsigned long offset = (unsigned long)e;
2050 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
2051 return offset;
2052}
2053
2054static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
2055{
2056 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
2057}
2058
2059BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
2060 disk_bytenr, 64);
2061BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
2062 generation, 64);
2063BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
2064 disk_num_bytes, 64);
2065BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
2066 offset, 64);
2067BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
2068 num_bytes, 64);
2069BTRFS_SETGET_FUNCS(file_extent_ram_bytes, struct btrfs_file_extent_item,
2070 ram_bytes, 64);
2071BTRFS_SETGET_FUNCS(file_extent_compression, struct btrfs_file_extent_item,
2072 compression, 8);
2073BTRFS_SETGET_FUNCS(file_extent_encryption, struct btrfs_file_extent_item,
2074 encryption, 8);
2075BTRFS_SETGET_FUNCS(file_extent_other_encoding, struct btrfs_file_extent_item,
2076 other_encoding, 16);
2077
2078/* this returns the number of file bytes represented by the inline item.
2079 * If an item is compressed, this is the uncompressed size
2080 */
2081static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
2082 struct btrfs_file_extent_item *e)
2083{
2084 return btrfs_file_extent_ram_bytes(eb, e);
2085}
2086
2087/*
2088 * this returns the number of bytes used by the item on disk, minus the
2089 * size of any extent headers. If a file is compressed on disk, this is
2090 * the compressed size
2091 */
2092static inline u32 btrfs_file_extent_inline_item_len(struct extent_buffer *eb,
2093 struct btrfs_item *e)
2094{
2095 unsigned long offset;
2096 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
2097 return btrfs_item_size(eb, e) - offset;
2098}
2099
2100static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
2101{
2102 return sb->s_fs_info;
2103}
2104
2105static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
2106{
2107 if (level == 0)
2108 return root->leafsize;
2109 return root->nodesize;
2110}
2111
2112/* helper function to cast into the data area of the leaf. */
2113#define btrfs_item_ptr(leaf, slot, type) \
2114 ((type *)(btrfs_leaf_data(leaf) + \
2115 btrfs_item_offset_nr(leaf, slot)))
2116
2117#define btrfs_item_ptr_offset(leaf, slot) \
2118 ((unsigned long)(btrfs_leaf_data(leaf) + \
2119 btrfs_item_offset_nr(leaf, slot)))
2120
2121static inline struct dentry *fdentry(struct file *file)
2122{
2123 return file->f_path.dentry;
2124}
2125
2126static inline bool btrfs_mixed_space_info(struct btrfs_space_info *space_info)
2127{
2128 return ((space_info->flags & BTRFS_BLOCK_GROUP_METADATA) &&
2129 (space_info->flags & BTRFS_BLOCK_GROUP_DATA));
2130}
2131
2132/* extent-tree.c */
2133static inline u64 btrfs_calc_trans_metadata_size(struct btrfs_root *root,
2134 unsigned num_items)
2135{
2136 return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
2137 3 * num_items;
2138}
2139
2140void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2141int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
2142 struct btrfs_root *root, unsigned long count);
2143int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
2144int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
2145 struct btrfs_root *root, u64 bytenr,
2146 u64 num_bytes, u64 *refs, u64 *flags);
2147int btrfs_pin_extent(struct btrfs_root *root,
2148 u64 bytenr, u64 num, int reserved);
2149int btrfs_cross_ref_exist(struct btrfs_trans_handle *trans,
2150 struct btrfs_root *root,
2151 u64 objectid, u64 offset, u64 bytenr);
2152struct btrfs_block_group_cache *btrfs_lookup_block_group(
2153 struct btrfs_fs_info *info,
2154 u64 bytenr);
2155void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
2156u64 btrfs_find_block_group(struct btrfs_root *root,
2157 u64 search_start, u64 search_hint, int owner);
2158struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
2159 struct btrfs_root *root, u32 blocksize,
2160 u64 parent, u64 root_objectid,
2161 struct btrfs_disk_key *key, int level,
2162 u64 hint, u64 empty_size);
2163void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
2164 struct btrfs_root *root,
2165 struct extent_buffer *buf,
2166 u64 parent, int last_ref);
2167struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
2168 struct btrfs_root *root,
2169 u64 bytenr, u32 blocksize,
2170 int level);
2171int btrfs_alloc_reserved_file_extent(struct btrfs_trans_handle *trans,
2172 struct btrfs_root *root,
2173 u64 root_objectid, u64 owner,
2174 u64 offset, struct btrfs_key *ins);
2175int btrfs_alloc_logged_file_extent(struct btrfs_trans_handle *trans,
2176 struct btrfs_root *root,
2177 u64 root_objectid, u64 owner, u64 offset,
2178 struct btrfs_key *ins);
2179int btrfs_reserve_extent(struct btrfs_trans_handle *trans,
2180 struct btrfs_root *root,
2181 u64 num_bytes, u64 min_alloc_size,
2182 u64 empty_size, u64 hint_byte,
2183 u64 search_end, struct btrfs_key *ins,
2184 u64 data);
2185int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2186 struct extent_buffer *buf, int full_backref);
2187int btrfs_dec_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2188 struct extent_buffer *buf, int full_backref);
2189int btrfs_set_disk_extent_flags(struct btrfs_trans_handle *trans,
2190 struct btrfs_root *root,
2191 u64 bytenr, u64 num_bytes, u64 flags,
2192 int is_data);
2193int btrfs_free_extent(struct btrfs_trans_handle *trans,
2194 struct btrfs_root *root,
2195 u64 bytenr, u64 num_bytes, u64 parent,
2196 u64 root_objectid, u64 owner, u64 offset);
2197
2198int btrfs_free_reserved_extent(struct btrfs_root *root, u64 start, u64 len);
2199int btrfs_update_reserved_bytes(struct btrfs_block_group_cache *cache,
2200 u64 num_bytes, int reserve, int sinfo);
2201int btrfs_prepare_extent_commit(struct btrfs_trans_handle *trans,
2202 struct btrfs_root *root);
2203int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
2204 struct btrfs_root *root);
2205int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
2206 struct btrfs_root *root,
2207 u64 bytenr, u64 num_bytes, u64 parent,
2208 u64 root_objectid, u64 owner, u64 offset);
2209
2210int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
2211 struct btrfs_root *root);
2212int btrfs_extent_readonly(struct btrfs_root *root, u64 bytenr);
2213int btrfs_free_block_groups(struct btrfs_fs_info *info);
2214int btrfs_read_block_groups(struct btrfs_root *root);
2215int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr);
2216int btrfs_make_block_group(struct btrfs_trans_handle *trans,
2217 struct btrfs_root *root, u64 bytes_used,
2218 u64 type, u64 chunk_objectid, u64 chunk_offset,
2219 u64 size);
2220int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
2221 struct btrfs_root *root, u64 group_start);
2222u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
2223u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data);
2224void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
2225void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
2226int btrfs_check_data_free_space(struct inode *inode, u64 bytes);
2227void btrfs_free_reserved_data_space(struct inode *inode, u64 bytes);
2228void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
2229 struct btrfs_root *root);
2230int btrfs_orphan_reserve_metadata(struct btrfs_trans_handle *trans,
2231 struct inode *inode);
2232void btrfs_orphan_release_metadata(struct inode *inode);
2233int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
2234 struct btrfs_pending_snapshot *pending);
2235int btrfs_delalloc_reserve_metadata(struct inode *inode, u64 num_bytes);
2236void btrfs_delalloc_release_metadata(struct inode *inode, u64 num_bytes);
2237int btrfs_delalloc_reserve_space(struct inode *inode, u64 num_bytes);
2238void btrfs_delalloc_release_space(struct inode *inode, u64 num_bytes);
2239void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv);
2240struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root);
2241void btrfs_free_block_rsv(struct btrfs_root *root,
2242 struct btrfs_block_rsv *rsv);
2243void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info,
2244 struct btrfs_block_rsv *rsv);
2245int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
2246 struct btrfs_root *root,
2247 struct btrfs_block_rsv *block_rsv,
2248 u64 num_bytes);
2249int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
2250 struct btrfs_root *root,
2251 struct btrfs_block_rsv *block_rsv,
2252 u64 min_reserved, int min_factor);
2253int btrfs_block_rsv_migrate(struct btrfs_block_rsv *src_rsv,
2254 struct btrfs_block_rsv *dst_rsv,
2255 u64 num_bytes);
2256void btrfs_block_rsv_release(struct btrfs_root *root,
2257 struct btrfs_block_rsv *block_rsv,
2258 u64 num_bytes);
2259int btrfs_truncate_reserve_metadata(struct btrfs_trans_handle *trans,
2260 struct btrfs_root *root,
2261 struct btrfs_block_rsv *rsv);
2262int btrfs_set_block_group_ro(struct btrfs_root *root,
2263 struct btrfs_block_group_cache *cache);
2264int btrfs_set_block_group_rw(struct btrfs_root *root,
2265 struct btrfs_block_group_cache *cache);
2266void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
2267u64 btrfs_account_ro_block_groups_free_space(struct btrfs_space_info *sinfo);
2268int btrfs_error_unpin_extent_range(struct btrfs_root *root,
2269 u64 start, u64 end);
2270int btrfs_error_discard_extent(struct btrfs_root *root, u64 bytenr,
2271 u64 num_bytes, u64 *actual_bytes);
2272int btrfs_force_chunk_alloc(struct btrfs_trans_handle *trans,
2273 struct btrfs_root *root, u64 type);
2274int btrfs_trim_fs(struct btrfs_root *root, struct fstrim_range *range);
2275
2276int btrfs_init_space_info(struct btrfs_fs_info *fs_info);
2277/* ctree.c */
2278int btrfs_bin_search(struct extent_buffer *eb, struct btrfs_key *key,
2279 int level, int *slot);
2280int btrfs_comp_cpu_keys(struct btrfs_key *k1, struct btrfs_key *k2);
2281int btrfs_previous_item(struct btrfs_root *root,
2282 struct btrfs_path *path, u64 min_objectid,
2283 int type);
2284int btrfs_set_item_key_safe(struct btrfs_trans_handle *trans,
2285 struct btrfs_root *root, struct btrfs_path *path,
2286 struct btrfs_key *new_key);
2287struct extent_buffer *btrfs_root_node(struct btrfs_root *root);
2288struct extent_buffer *btrfs_lock_root_node(struct btrfs_root *root);
2289int btrfs_find_next_key(struct btrfs_root *root, struct btrfs_path *path,
2290 struct btrfs_key *key, int lowest_level,
2291 int cache_only, u64 min_trans);
2292int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key,
2293 struct btrfs_key *max_key,
2294 struct btrfs_path *path, int cache_only,
2295 u64 min_trans);
2296int btrfs_cow_block(struct btrfs_trans_handle *trans,
2297 struct btrfs_root *root, struct extent_buffer *buf,
2298 struct extent_buffer *parent, int parent_slot,
2299 struct extent_buffer **cow_ret);
2300int btrfs_copy_root(struct btrfs_trans_handle *trans,
2301 struct btrfs_root *root,
2302 struct extent_buffer *buf,
2303 struct extent_buffer **cow_ret, u64 new_root_objectid);
2304int btrfs_block_can_be_shared(struct btrfs_root *root,
2305 struct extent_buffer *buf);
2306int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
2307 *root, struct btrfs_path *path, u32 data_size);
2308int btrfs_truncate_item(struct btrfs_trans_handle *trans,
2309 struct btrfs_root *root,
2310 struct btrfs_path *path,
2311 u32 new_size, int from_end);
2312int btrfs_split_item(struct btrfs_trans_handle *trans,
2313 struct btrfs_root *root,
2314 struct btrfs_path *path,
2315 struct btrfs_key *new_key,
2316 unsigned long split_offset);
2317int btrfs_duplicate_item(struct btrfs_trans_handle *trans,
2318 struct btrfs_root *root,
2319 struct btrfs_path *path,
2320 struct btrfs_key *new_key);
2321int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
2322 *root, struct btrfs_key *key, struct btrfs_path *p, int
2323 ins_len, int cow);
2324int btrfs_realloc_node(struct btrfs_trans_handle *trans,
2325 struct btrfs_root *root, struct extent_buffer *parent,
2326 int start_slot, int cache_only, u64 *last_ret,
2327 struct btrfs_key *progress);
2328void btrfs_release_path(struct btrfs_path *p);
2329struct btrfs_path *btrfs_alloc_path(void);
2330void btrfs_free_path(struct btrfs_path *p);
2331void btrfs_set_path_blocking(struct btrfs_path *p);
2332void btrfs_clear_path_blocking(struct btrfs_path *p,
2333 struct extent_buffer *held, int held_rw);
2334void btrfs_unlock_up_safe(struct btrfs_path *p, int level);
2335
2336int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2337 struct btrfs_path *path, int slot, int nr);
2338static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
2339 struct btrfs_root *root,
2340 struct btrfs_path *path)
2341{
2342 return btrfs_del_items(trans, root, path, path->slots[0], 1);
2343}
2344
2345int setup_items_for_insert(struct btrfs_trans_handle *trans,
2346 struct btrfs_root *root, struct btrfs_path *path,
2347 struct btrfs_key *cpu_key, u32 *data_size,
2348 u32 total_data, u32 total_size, int nr);
2349int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
2350 *root, struct btrfs_key *key, void *data, u32 data_size);
2351int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
2352 struct btrfs_root *root,
2353 struct btrfs_path *path,
2354 struct btrfs_key *cpu_key, u32 *data_size, int nr);
2355
2356static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
2357 struct btrfs_root *root,
2358 struct btrfs_path *path,
2359 struct btrfs_key *key,
2360 u32 data_size)
2361{
2362 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
2363}
2364
2365int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
2366int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
2367int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
2368void btrfs_drop_snapshot(struct btrfs_root *root,
2369 struct btrfs_block_rsv *block_rsv, int update_ref);
2370int btrfs_drop_subtree(struct btrfs_trans_handle *trans,
2371 struct btrfs_root *root,
2372 struct extent_buffer *node,
2373 struct extent_buffer *parent);
2374static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
2375{
2376 /*
2377 * Get synced with close_ctree()
2378 */
2379 smp_mb();
2380 return fs_info->closing;
2381}
2382
2383/* root-item.c */
2384int btrfs_find_root_ref(struct btrfs_root *tree_root,
2385 struct btrfs_path *path,
2386 u64 root_id, u64 ref_id);
2387int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
2388 struct btrfs_root *tree_root,
2389 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
2390 const char *name, int name_len);
2391int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
2392 struct btrfs_root *tree_root,
2393 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
2394 const char *name, int name_len);
2395int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
2396 struct btrfs_key *key);
2397int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
2398 *root, struct btrfs_key *key, struct btrfs_root_item
2399 *item);
2400int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
2401 *root, struct btrfs_key *key, struct btrfs_root_item
2402 *item);
2403int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
2404 btrfs_root_item *item, struct btrfs_key *key);
2405int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid);
2406int btrfs_find_orphan_roots(struct btrfs_root *tree_root);
2407void btrfs_set_root_node(struct btrfs_root_item *item,
2408 struct extent_buffer *node);
2409void btrfs_check_and_init_root_item(struct btrfs_root_item *item);
2410
2411/* dir-item.c */
2412int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
2413 struct btrfs_root *root, const char *name,
2414 int name_len, struct inode *dir,
2415 struct btrfs_key *location, u8 type, u64 index);
2416struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
2417 struct btrfs_root *root,
2418 struct btrfs_path *path, u64 dir,
2419 const char *name, int name_len,
2420 int mod);
2421struct btrfs_dir_item *
2422btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
2423 struct btrfs_root *root,
2424 struct btrfs_path *path, u64 dir,
2425 u64 objectid, const char *name, int name_len,
2426 int mod);
2427struct btrfs_dir_item *
2428btrfs_search_dir_index_item(struct btrfs_root *root,
2429 struct btrfs_path *path, u64 dirid,
2430 const char *name, int name_len);
2431struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
2432 struct btrfs_path *path,
2433 const char *name, int name_len);
2434int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
2435 struct btrfs_root *root,
2436 struct btrfs_path *path,
2437 struct btrfs_dir_item *di);
2438int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
2439 struct btrfs_root *root,
2440 struct btrfs_path *path, u64 objectid,
2441 const char *name, u16 name_len,
2442 const void *data, u16 data_len);
2443struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
2444 struct btrfs_root *root,
2445 struct btrfs_path *path, u64 dir,
2446 const char *name, u16 name_len,
2447 int mod);
2448int verify_dir_item(struct btrfs_root *root,
2449 struct extent_buffer *leaf,
2450 struct btrfs_dir_item *dir_item);
2451
2452/* orphan.c */
2453int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
2454 struct btrfs_root *root, u64 offset);
2455int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
2456 struct btrfs_root *root, u64 offset);
2457int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset);
2458
2459/* inode-item.c */
2460int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
2461 struct btrfs_root *root,
2462 const char *name, int name_len,
2463 u64 inode_objectid, u64 ref_objectid, u64 index);
2464int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
2465 struct btrfs_root *root,
2466 const char *name, int name_len,
2467 u64 inode_objectid, u64 ref_objectid, u64 *index);
2468struct btrfs_inode_ref *
2469btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
2470 struct btrfs_root *root,
2471 struct btrfs_path *path,
2472 const char *name, int name_len,
2473 u64 inode_objectid, u64 ref_objectid, int mod);
2474int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
2475 struct btrfs_root *root,
2476 struct btrfs_path *path, u64 objectid);
2477int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
2478 *root, struct btrfs_path *path,
2479 struct btrfs_key *location, int mod);
2480
2481/* file-item.c */
2482int btrfs_del_csums(struct btrfs_trans_handle *trans,
2483 struct btrfs_root *root, u64 bytenr, u64 len);
2484int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
2485 struct bio *bio, u32 *dst);
2486int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
2487 struct bio *bio, u64 logical_offset, u32 *dst);
2488int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
2489 struct btrfs_root *root,
2490 u64 objectid, u64 pos,
2491 u64 disk_offset, u64 disk_num_bytes,
2492 u64 num_bytes, u64 offset, u64 ram_bytes,
2493 u8 compression, u8 encryption, u16 other_encoding);
2494int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
2495 struct btrfs_root *root,
2496 struct btrfs_path *path, u64 objectid,
2497 u64 bytenr, int mod);
2498int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
2499 struct btrfs_root *root,
2500 struct btrfs_ordered_sum *sums);
2501int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
2502 struct bio *bio, u64 file_start, int contig);
2503struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
2504 struct btrfs_root *root,
2505 struct btrfs_path *path,
2506 u64 bytenr, int cow);
2507int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
2508 struct btrfs_root *root, struct btrfs_path *path,
2509 u64 isize);
2510int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
2511 struct list_head *list, int search_commit);
2512/* inode.c */
2513struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page,
2514 size_t pg_offset, u64 start, u64 len,
2515 int create);
2516
2517/* RHEL and EL kernels have a patch that renames PG_checked to FsMisc */
2518#if defined(ClearPageFsMisc) && !defined(ClearPageChecked)
2519#define ClearPageChecked ClearPageFsMisc
2520#define SetPageChecked SetPageFsMisc
2521#define PageChecked PageFsMisc
2522#endif
2523
2524/* This forces readahead on a given range of bytes in an inode */
2525static inline void btrfs_force_ra(struct address_space *mapping,
2526 struct file_ra_state *ra, struct file *file,
2527 pgoff_t offset, unsigned long req_size)
2528{
2529 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2530}
2531
2532struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry);
2533int btrfs_set_inode_index(struct inode *dir, u64 *index);
2534int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
2535 struct btrfs_root *root,
2536 struct inode *dir, struct inode *inode,
2537 const char *name, int name_len);
2538int btrfs_add_link(struct btrfs_trans_handle *trans,
2539 struct inode *parent_inode, struct inode *inode,
2540 const char *name, int name_len, int add_backref, u64 index);
2541int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
2542 struct btrfs_root *root,
2543 struct inode *dir, u64 objectid,
2544 const char *name, int name_len);
2545int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
2546 struct btrfs_root *root,
2547 struct inode *inode, u64 new_size,
2548 u32 min_type);
2549
2550int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput);
2551int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end,
2552 struct extent_state **cached_state);
2553int btrfs_writepages(struct address_space *mapping,
2554 struct writeback_control *wbc);
2555int btrfs_create_subvol_root(struct btrfs_trans_handle *trans,
2556 struct btrfs_root *new_root, u64 new_dirid);
2557int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
2558 size_t size, struct bio *bio, unsigned long bio_flags);
2559
2560int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2561int btrfs_readpage(struct file *file, struct page *page);
2562void btrfs_evict_inode(struct inode *inode);
2563int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc);
2564void btrfs_dirty_inode(struct inode *inode, int flags);
2565struct inode *btrfs_alloc_inode(struct super_block *sb);
2566void btrfs_destroy_inode(struct inode *inode);
2567int btrfs_drop_inode(struct inode *inode);
2568int btrfs_init_cachep(void);
2569void btrfs_destroy_cachep(void);
2570long btrfs_ioctl_trans_end(struct file *file);
2571struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location,
2572 struct btrfs_root *root, int *was_new);
2573struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2574 size_t pg_offset, u64 start, u64 end,
2575 int create);
2576int btrfs_update_inode(struct btrfs_trans_handle *trans,
2577 struct btrfs_root *root,
2578 struct inode *inode);
2579int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode);
2580int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode);
2581int btrfs_orphan_cleanup(struct btrfs_root *root);
2582void btrfs_orphan_pre_snapshot(struct btrfs_trans_handle *trans,
2583 struct btrfs_pending_snapshot *pending,
2584 u64 *bytes_to_reserve);
2585void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
2586 struct btrfs_pending_snapshot *pending);
2587void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
2588 struct btrfs_root *root);
2589int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
2590int btrfs_invalidate_inodes(struct btrfs_root *root);
2591void btrfs_add_delayed_iput(struct inode *inode);
2592void btrfs_run_delayed_iputs(struct btrfs_root *root);
2593int btrfs_prealloc_file_range(struct inode *inode, int mode,
2594 u64 start, u64 num_bytes, u64 min_size,
2595 loff_t actual_len, u64 *alloc_hint);
2596int btrfs_prealloc_file_range_trans(struct inode *inode,
2597 struct btrfs_trans_handle *trans, int mode,
2598 u64 start, u64 num_bytes, u64 min_size,
2599 loff_t actual_len, u64 *alloc_hint);
2600extern const struct dentry_operations btrfs_dentry_operations;
2601
2602/* ioctl.c */
2603long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
2604void btrfs_update_iflags(struct inode *inode);
2605void btrfs_inherit_iflags(struct inode *inode, struct inode *dir);
2606int btrfs_defrag_file(struct inode *inode, struct file *file,
2607 struct btrfs_ioctl_defrag_range_args *range,
2608 u64 newer_than, unsigned long max_pages);
2609/* file.c */
2610int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans,
2611 struct inode *inode);
2612int btrfs_run_defrag_inodes(struct btrfs_fs_info *fs_info);
2613int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);
2614int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
2615 int skip_pinned);
2616extern const struct file_operations btrfs_file_operations;
2617int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
2618 u64 start, u64 end, u64 *hint_byte, int drop_cache);
2619int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
2620 struct inode *inode, u64 start, u64 end);
2621int btrfs_release_file(struct inode *inode, struct file *file);
2622void btrfs_drop_pages(struct page **pages, size_t num_pages);
2623int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode,
2624 struct page **pages, size_t num_pages,
2625 loff_t pos, size_t write_bytes,
2626 struct extent_state **cached);
2627
2628/* tree-defrag.c */
2629int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
2630 struct btrfs_root *root, int cache_only);
2631
2632/* sysfs.c */
2633int btrfs_init_sysfs(void);
2634void btrfs_exit_sysfs(void);
2635
2636/* xattr.c */
2637ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
2638
2639/* super.c */
2640int btrfs_parse_options(struct btrfs_root *root, char *options);
2641int btrfs_sync_fs(struct super_block *sb, int wait);
2642void __btrfs_std_error(struct btrfs_fs_info *fs_info, const char *function,
2643 unsigned int line, int errno);
2644
2645#define btrfs_std_error(fs_info, errno) \
2646do { \
2647 if ((errno)) \
2648 __btrfs_std_error((fs_info), __func__, __LINE__, (errno));\
2649} while (0)
2650
2651/* acl.c */
2652#ifdef CONFIG_BTRFS_FS_POSIX_ACL
2653struct posix_acl *btrfs_get_acl(struct inode *inode, int type);
2654int btrfs_init_acl(struct btrfs_trans_handle *trans,
2655 struct inode *inode, struct inode *dir);
2656int btrfs_acl_chmod(struct inode *inode);
2657#else
2658#define btrfs_get_acl NULL
2659static inline int btrfs_init_acl(struct btrfs_trans_handle *trans,
2660 struct inode *inode, struct inode *dir)
2661{
2662 return 0;
2663}
2664static inline int btrfs_acl_chmod(struct inode *inode)
2665{
2666 return 0;
2667}
2668#endif
2669
2670/* relocation.c */
2671int btrfs_relocate_block_group(struct btrfs_root *root, u64 group_start);
2672int btrfs_init_reloc_root(struct btrfs_trans_handle *trans,
2673 struct btrfs_root *root);
2674int btrfs_update_reloc_root(struct btrfs_trans_handle *trans,
2675 struct btrfs_root *root);
2676int btrfs_recover_relocation(struct btrfs_root *root);
2677int btrfs_reloc_clone_csums(struct inode *inode, u64 file_pos, u64 len);
2678void btrfs_reloc_cow_block(struct btrfs_trans_handle *trans,
2679 struct btrfs_root *root, struct extent_buffer *buf,
2680 struct extent_buffer *cow);
2681void btrfs_reloc_pre_snapshot(struct btrfs_trans_handle *trans,
2682 struct btrfs_pending_snapshot *pending,
2683 u64 *bytes_to_reserve);
2684void btrfs_reloc_post_snapshot(struct btrfs_trans_handle *trans,
2685 struct btrfs_pending_snapshot *pending);
2686
2687/* scrub.c */
2688int btrfs_scrub_dev(struct btrfs_root *root, u64 devid, u64 start, u64 end,
2689 struct btrfs_scrub_progress *progress, int readonly);
2690int btrfs_scrub_pause(struct btrfs_root *root);
2691int btrfs_scrub_pause_super(struct btrfs_root *root);
2692int btrfs_scrub_continue(struct btrfs_root *root);
2693int btrfs_scrub_continue_super(struct btrfs_root *root);
2694int btrfs_scrub_cancel(struct btrfs_root *root);
2695int btrfs_scrub_cancel_dev(struct btrfs_root *root, struct btrfs_device *dev);
2696int btrfs_scrub_cancel_devid(struct btrfs_root *root, u64 devid);
2697int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
2698 struct btrfs_scrub_progress *progress);
2699
2700#endif