4 #include <linux/rbtree.h>
5 #include <linux/refcount.h>
8 /* bits for the extent state */
9 #define EXTENT_DIRTY (1U << 0)
10 #define EXTENT_WRITEBACK (1U << 1)
11 #define EXTENT_UPTODATE (1U << 2)
12 #define EXTENT_LOCKED (1U << 3)
13 #define EXTENT_NEW (1U << 4)
14 #define EXTENT_DELALLOC (1U << 5)
15 #define EXTENT_DEFRAG (1U << 6)
16 #define EXTENT_BOUNDARY (1U << 9)
17 #define EXTENT_NODATASUM (1U << 10)
18 #define EXTENT_CLEAR_META_RESV (1U << 11)
19 #define EXTENT_FIRST_DELALLOC (1U << 12)
20 #define EXTENT_NEED_WAIT (1U << 13)
21 #define EXTENT_DAMAGED (1U << 14)
22 #define EXTENT_NORESERVE (1U << 15)
23 #define EXTENT_QGROUP_RESERVED (1U << 16)
24 #define EXTENT_CLEAR_DATA_RESV (1U << 17)
25 #define EXTENT_DELALLOC_NEW (1U << 18)
26 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
27 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \
28 EXTENT_CLEAR_DATA_RESV)
29 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
32 * flags for bio submission. The high bits indicate the compression
35 #define EXTENT_BIO_COMPRESSED 1
36 #define EXTENT_BIO_TREE_LOG 2
37 #define EXTENT_BIO_FLAG_SHIFT 16
39 /* these are bit numbers for test/set bit */
40 #define EXTENT_BUFFER_UPTODATE 0
41 #define EXTENT_BUFFER_DIRTY 2
42 #define EXTENT_BUFFER_CORRUPT 3
43 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
44 #define EXTENT_BUFFER_TREE_REF 5
45 #define EXTENT_BUFFER_STALE 6
46 #define EXTENT_BUFFER_WRITEBACK 7
47 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
48 #define EXTENT_BUFFER_DUMMY 9
49 #define EXTENT_BUFFER_IN_TREE 10
50 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
52 /* these are flags for __process_pages_contig */
53 #define PAGE_UNLOCK (1 << 0)
54 #define PAGE_CLEAR_DIRTY (1 << 1)
55 #define PAGE_SET_WRITEBACK (1 << 2)
56 #define PAGE_END_WRITEBACK (1 << 3)
57 #define PAGE_SET_PRIVATE2 (1 << 4)
58 #define PAGE_SET_ERROR (1 << 5)
59 #define PAGE_LOCK (1 << 6)
62 * page->private values. Every page that is controlled by the extent
63 * map has page->private set to one.
65 #define EXTENT_PAGE_PRIVATE 1
68 * The extent buffer bitmap operations are done with byte granularity instead of
69 * word granularity for two reasons:
70 * 1. The bitmaps must be little-endian on disk.
71 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
72 * single word in a bitmap may straddle two pages in the extent buffer.
74 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
75 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
76 #define BITMAP_FIRST_BYTE_MASK(start) \
77 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
78 #define BITMAP_LAST_BYTE_MASK(nbits) \
79 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
81 static inline int le_test_bit(int nr
, const u8
*addr
)
83 return 1U & (addr
[BIT_BYTE(nr
)] >> (nr
& (BITS_PER_BYTE
-1)));
86 extern void le_bitmap_set(u8
*map
, unsigned int start
, int len
);
87 extern void le_bitmap_clear(u8
*map
, unsigned int start
, int len
);
93 struct io_failure_record
;
95 typedef blk_status_t (extent_submit_bio_hook_t
)(void *private_data
, struct bio
*bio
,
96 int mirror_num
, unsigned long bio_flags
,
98 struct extent_io_ops
{
100 * The following callbacks must be allways defined, the function
101 * pointer will be called unconditionally.
103 extent_submit_bio_hook_t
*submit_bio_hook
;
104 int (*readpage_end_io_hook
)(struct btrfs_io_bio
*io_bio
, u64 phy_offset
,
105 struct page
*page
, u64 start
, u64 end
,
107 int (*merge_bio_hook
)(struct page
*page
, unsigned long offset
,
108 size_t size
, struct bio
*bio
,
109 unsigned long bio_flags
);
110 int (*readpage_io_failed_hook
)(struct page
*page
, int failed_mirror
);
111 struct btrfs_fs_info
*(*tree_fs_info
)(void *private_data
);
112 void (*set_range_writeback
)(void *private_data
, u64 start
, u64 end
);
115 * Optional hooks, called if the pointer is not NULL
117 int (*fill_delalloc
)(void *private_data
, struct page
*locked_page
,
118 u64 start
, u64 end
, int *page_started
,
119 unsigned long *nr_written
);
121 int (*writepage_start_hook
)(struct page
*page
, u64 start
, u64 end
);
122 void (*writepage_end_io_hook
)(struct page
*page
, u64 start
, u64 end
,
123 struct extent_state
*state
, int uptodate
);
124 void (*set_bit_hook
)(void *private_data
, struct extent_state
*state
,
126 void (*clear_bit_hook
)(void *private_data
,
127 struct extent_state
*state
,
129 void (*merge_extent_hook
)(void *private_data
,
130 struct extent_state
*new,
131 struct extent_state
*other
);
132 void (*split_extent_hook
)(void *private_data
,
133 struct extent_state
*orig
, u64 split
);
134 void (*check_extent_io_range
)(void *private_data
, const char *caller
,
138 struct extent_io_tree
{
139 struct rb_root state
;
144 const struct extent_io_ops
*ops
;
147 struct extent_state
{
149 u64 end
; /* inclusive */
150 struct rb_node rb_node
;
152 /* ADD NEW ELEMENTS AFTER THIS */
153 wait_queue_head_t wq
;
157 struct io_failure_record
*failrec
;
159 #ifdef CONFIG_BTRFS_DEBUG
160 struct list_head leak_list
;
164 #define INLINE_EXTENT_BUFFER_PAGES 16
165 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
166 struct extent_buffer
{
169 unsigned long bflags
;
170 struct btrfs_fs_info
*fs_info
;
171 spinlock_t refs_lock
;
175 struct rcu_head rcu_head
;
178 /* count of read lock holders on the extent buffer */
179 atomic_t write_locks
;
181 atomic_t blocking_writers
;
182 atomic_t blocking_readers
;
183 atomic_t spinning_readers
;
184 atomic_t spinning_writers
;
186 /* >= 0 if eb belongs to a log tree, -1 otherwise */
189 /* protects write locks */
192 /* readers use lock_wq while they wait for the write
193 * lock holders to unlock
195 wait_queue_head_t write_lock_wq
;
197 /* writers use read_lock_wq while they wait for readers
200 wait_queue_head_t read_lock_wq
;
201 struct page
*pages
[INLINE_EXTENT_BUFFER_PAGES
];
202 #ifdef CONFIG_BTRFS_DEBUG
203 struct list_head leak_list
;
208 * Structure to record how many bytes and which ranges are set/cleared
210 struct extent_changeset
{
211 /* How many bytes are set/cleared in this operation */
212 unsigned int bytes_changed
;
215 struct ulist range_changed
;
218 static inline void extent_changeset_init(struct extent_changeset
*changeset
)
220 changeset
->bytes_changed
= 0;
221 ulist_init(&changeset
->range_changed
);
224 static inline struct extent_changeset
*extent_changeset_alloc(void)
226 struct extent_changeset
*ret
;
228 ret
= kmalloc(sizeof(*ret
), GFP_KERNEL
);
232 extent_changeset_init(ret
);
236 static inline void extent_changeset_release(struct extent_changeset
*changeset
)
240 changeset
->bytes_changed
= 0;
241 ulist_release(&changeset
->range_changed
);
244 static inline void extent_changeset_free(struct extent_changeset
*changeset
)
248 extent_changeset_release(changeset
);
252 static inline void extent_set_compress_type(unsigned long *bio_flags
,
255 *bio_flags
|= compress_type
<< EXTENT_BIO_FLAG_SHIFT
;
258 static inline int extent_compress_type(unsigned long bio_flags
)
260 return bio_flags
>> EXTENT_BIO_FLAG_SHIFT
;
263 struct extent_map_tree
;
265 typedef struct extent_map
*(get_extent_t
)(struct btrfs_inode
*inode
,
271 void extent_io_tree_init(struct extent_io_tree
*tree
, void *private_data
);
272 int try_release_extent_mapping(struct extent_map_tree
*map
,
273 struct extent_io_tree
*tree
, struct page
*page
,
275 int try_release_extent_buffer(struct page
*page
);
276 int lock_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
277 struct extent_state
**cached
);
279 static inline int lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
)
281 return lock_extent_bits(tree
, start
, end
, NULL
);
284 int try_lock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
);
285 int extent_read_full_page(struct extent_io_tree
*tree
, struct page
*page
,
286 get_extent_t
*get_extent
, int mirror_num
);
287 int __init
extent_io_init(void);
288 void extent_io_exit(void);
290 u64
count_range_bits(struct extent_io_tree
*tree
,
291 u64
*start
, u64 search_end
,
292 u64 max_bytes
, unsigned bits
, int contig
);
294 void free_extent_state(struct extent_state
*state
);
295 int test_range_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
296 unsigned bits
, int filled
,
297 struct extent_state
*cached_state
);
298 int clear_record_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
299 unsigned bits
, struct extent_changeset
*changeset
);
300 int clear_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
301 unsigned bits
, int wake
, int delete,
302 struct extent_state
**cached
, gfp_t mask
);
304 static inline int unlock_extent(struct extent_io_tree
*tree
, u64 start
, u64 end
)
306 return clear_extent_bit(tree
, start
, end
, EXTENT_LOCKED
, 1, 0, NULL
,
310 static inline int unlock_extent_cached(struct extent_io_tree
*tree
, u64 start
,
311 u64 end
, struct extent_state
**cached
, gfp_t mask
)
313 return clear_extent_bit(tree
, start
, end
, EXTENT_LOCKED
, 1, 0, cached
,
317 static inline int clear_extent_bits(struct extent_io_tree
*tree
, u64 start
,
318 u64 end
, unsigned bits
)
322 if (bits
& EXTENT_LOCKED
)
325 return clear_extent_bit(tree
, start
, end
, bits
, wake
, 0, NULL
,
329 int set_record_extent_bits(struct extent_io_tree
*tree
, u64 start
, u64 end
,
330 unsigned bits
, struct extent_changeset
*changeset
);
331 int set_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
332 unsigned bits
, u64
*failed_start
,
333 struct extent_state
**cached_state
, gfp_t mask
);
335 static inline int set_extent_bits(struct extent_io_tree
*tree
, u64 start
,
336 u64 end
, unsigned bits
)
338 return set_extent_bit(tree
, start
, end
, bits
, NULL
, NULL
, GFP_NOFS
);
341 static inline int clear_extent_uptodate(struct extent_io_tree
*tree
, u64 start
,
342 u64 end
, struct extent_state
**cached_state
, gfp_t mask
)
344 return clear_extent_bit(tree
, start
, end
, EXTENT_UPTODATE
, 0, 0,
348 static inline int set_extent_dirty(struct extent_io_tree
*tree
, u64 start
,
351 return set_extent_bit(tree
, start
, end
, EXTENT_DIRTY
, NULL
,
355 static inline int clear_extent_dirty(struct extent_io_tree
*tree
, u64 start
,
358 return clear_extent_bit(tree
, start
, end
,
359 EXTENT_DIRTY
| EXTENT_DELALLOC
|
360 EXTENT_DO_ACCOUNTING
, 0, 0, NULL
, GFP_NOFS
);
363 int convert_extent_bit(struct extent_io_tree
*tree
, u64 start
, u64 end
,
364 unsigned bits
, unsigned clear_bits
,
365 struct extent_state
**cached_state
);
367 static inline int set_extent_delalloc(struct extent_io_tree
*tree
, u64 start
,
368 u64 end
, struct extent_state
**cached_state
)
370 return set_extent_bit(tree
, start
, end
,
371 EXTENT_DELALLOC
| EXTENT_UPTODATE
,
372 NULL
, cached_state
, GFP_NOFS
);
375 static inline int set_extent_defrag(struct extent_io_tree
*tree
, u64 start
,
376 u64 end
, struct extent_state
**cached_state
)
378 return set_extent_bit(tree
, start
, end
,
379 EXTENT_DELALLOC
| EXTENT_UPTODATE
| EXTENT_DEFRAG
,
380 NULL
, cached_state
, GFP_NOFS
);
383 static inline int set_extent_new(struct extent_io_tree
*tree
, u64 start
,
386 return set_extent_bit(tree
, start
, end
, EXTENT_NEW
, NULL
, NULL
,
390 static inline int set_extent_uptodate(struct extent_io_tree
*tree
, u64 start
,
391 u64 end
, struct extent_state
**cached_state
, gfp_t mask
)
393 return set_extent_bit(tree
, start
, end
, EXTENT_UPTODATE
, NULL
,
397 int find_first_extent_bit(struct extent_io_tree
*tree
, u64 start
,
398 u64
*start_ret
, u64
*end_ret
, unsigned bits
,
399 struct extent_state
**cached_state
);
400 int extent_invalidatepage(struct extent_io_tree
*tree
,
401 struct page
*page
, unsigned long offset
);
402 int extent_write_full_page(struct extent_io_tree
*tree
, struct page
*page
,
403 get_extent_t
*get_extent
,
404 struct writeback_control
*wbc
);
405 int extent_write_locked_range(struct extent_io_tree
*tree
, struct inode
*inode
,
406 u64 start
, u64 end
, get_extent_t
*get_extent
,
408 int extent_writepages(struct extent_io_tree
*tree
,
409 struct address_space
*mapping
,
410 get_extent_t
*get_extent
,
411 struct writeback_control
*wbc
);
412 int btree_write_cache_pages(struct address_space
*mapping
,
413 struct writeback_control
*wbc
);
414 int extent_readpages(struct extent_io_tree
*tree
,
415 struct address_space
*mapping
,
416 struct list_head
*pages
, unsigned nr_pages
,
417 get_extent_t get_extent
);
418 int extent_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
419 __u64 start
, __u64 len
, get_extent_t
*get_extent
);
420 void set_page_extent_mapped(struct page
*page
);
422 struct extent_buffer
*alloc_extent_buffer(struct btrfs_fs_info
*fs_info
,
424 struct extent_buffer
*__alloc_dummy_extent_buffer(struct btrfs_fs_info
*fs_info
,
425 u64 start
, unsigned long len
);
426 struct extent_buffer
*alloc_dummy_extent_buffer(struct btrfs_fs_info
*fs_info
,
428 struct extent_buffer
*btrfs_clone_extent_buffer(struct extent_buffer
*src
);
429 struct extent_buffer
*find_extent_buffer(struct btrfs_fs_info
*fs_info
,
431 void free_extent_buffer(struct extent_buffer
*eb
);
432 void free_extent_buffer_stale(struct extent_buffer
*eb
);
434 #define WAIT_COMPLETE 1
435 #define WAIT_PAGE_LOCK 2
436 int read_extent_buffer_pages(struct extent_io_tree
*tree
,
437 struct extent_buffer
*eb
, int wait
,
438 get_extent_t
*get_extent
, int mirror_num
);
439 void wait_on_extent_buffer_writeback(struct extent_buffer
*eb
);
441 static inline unsigned long num_extent_pages(u64 start
, u64 len
)
443 return ((start
+ len
+ PAGE_SIZE
- 1) >> PAGE_SHIFT
) -
444 (start
>> PAGE_SHIFT
);
447 static inline void extent_buffer_get(struct extent_buffer
*eb
)
449 atomic_inc(&eb
->refs
);
452 int memcmp_extent_buffer(struct extent_buffer
*eb
, const void *ptrv
,
455 void read_extent_buffer(struct extent_buffer
*eb
, void *dst
,
458 int read_extent_buffer_to_user(struct extent_buffer
*eb
, void __user
*dst
,
461 void write_extent_buffer_fsid(struct extent_buffer
*eb
, const void *src
);
462 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer
*eb
,
464 void write_extent_buffer(struct extent_buffer
*eb
, const void *src
,
465 unsigned long start
, unsigned long len
);
466 void copy_extent_buffer_full(struct extent_buffer
*dst
,
467 struct extent_buffer
*src
);
468 void copy_extent_buffer(struct extent_buffer
*dst
, struct extent_buffer
*src
,
469 unsigned long dst_offset
, unsigned long src_offset
,
471 void memcpy_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
472 unsigned long src_offset
, unsigned long len
);
473 void memmove_extent_buffer(struct extent_buffer
*dst
, unsigned long dst_offset
,
474 unsigned long src_offset
, unsigned long len
);
475 void memzero_extent_buffer(struct extent_buffer
*eb
, unsigned long start
,
477 int extent_buffer_test_bit(struct extent_buffer
*eb
, unsigned long start
,
479 void extent_buffer_bitmap_set(struct extent_buffer
*eb
, unsigned long start
,
480 unsigned long pos
, unsigned long len
);
481 void extent_buffer_bitmap_clear(struct extent_buffer
*eb
, unsigned long start
,
482 unsigned long pos
, unsigned long len
);
483 void clear_extent_buffer_dirty(struct extent_buffer
*eb
);
484 int set_extent_buffer_dirty(struct extent_buffer
*eb
);
485 void set_extent_buffer_uptodate(struct extent_buffer
*eb
);
486 void clear_extent_buffer_uptodate(struct extent_buffer
*eb
);
487 int extent_buffer_uptodate(struct extent_buffer
*eb
);
488 int extent_buffer_under_io(struct extent_buffer
*eb
);
489 int map_private_extent_buffer(struct extent_buffer
*eb
, unsigned long offset
,
490 unsigned long min_len
, char **map
,
491 unsigned long *map_start
,
492 unsigned long *map_len
);
493 void extent_range_clear_dirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
494 void extent_range_redirty_for_io(struct inode
*inode
, u64 start
, u64 end
);
495 void extent_clear_unlock_delalloc(struct inode
*inode
, u64 start
, u64 end
,
496 u64 delalloc_end
, struct page
*locked_page
,
497 unsigned bits_to_clear
,
498 unsigned long page_ops
);
499 struct bio
*btrfs_bio_alloc(struct block_device
*bdev
, u64 first_byte
);
500 struct bio
*btrfs_io_bio_alloc(unsigned int nr_iovecs
);
501 struct bio
*btrfs_bio_clone(struct bio
*bio
);
502 struct bio
*btrfs_bio_clone_partial(struct bio
*orig
, int offset
, int size
);
504 struct btrfs_fs_info
;
507 int repair_io_failure(struct btrfs_fs_info
*fs_info
, u64 ino
, u64 start
,
508 u64 length
, u64 logical
, struct page
*page
,
509 unsigned int pg_offset
, int mirror_num
);
510 int clean_io_failure(struct btrfs_fs_info
*fs_info
,
511 struct extent_io_tree
*failure_tree
,
512 struct extent_io_tree
*io_tree
, u64 start
,
513 struct page
*page
, u64 ino
, unsigned int pg_offset
);
514 void end_extent_writepage(struct page
*page
, int err
, u64 start
, u64 end
);
515 int repair_eb_io_failure(struct btrfs_fs_info
*fs_info
,
516 struct extent_buffer
*eb
, int mirror_num
);
519 * When IO fails, either with EIO or csum verification fails, we
520 * try other mirrors that might have a good copy of the data. This
521 * io_failure_record is used to record state as we go through all the
522 * mirrors. If another mirror has good data, the page is set up to date
523 * and things continue. If a good mirror can't be found, the original
524 * bio end_io callback is called to indicate things have failed.
526 struct io_failure_record
{
531 unsigned long bio_flags
;
538 void btrfs_free_io_failure_record(struct btrfs_inode
*inode
, u64 start
,
540 int btrfs_get_io_failure_record(struct inode
*inode
, u64 start
, u64 end
,
541 struct io_failure_record
**failrec_ret
);
542 int btrfs_check_repairable(struct inode
*inode
, struct bio
*failed_bio
,
543 struct io_failure_record
*failrec
, int fail_mirror
);
544 struct bio
*btrfs_create_repair_bio(struct inode
*inode
, struct bio
*failed_bio
,
545 struct io_failure_record
*failrec
,
546 struct page
*page
, int pg_offset
, int icsum
,
547 bio_end_io_t
*endio_func
, void *data
);
548 int free_io_failure(struct extent_io_tree
*failure_tree
,
549 struct extent_io_tree
*io_tree
,
550 struct io_failure_record
*rec
);
551 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
552 noinline u64
find_lock_delalloc_range(struct inode
*inode
,
553 struct extent_io_tree
*tree
,
554 struct page
*locked_page
, u64
*start
,
555 u64
*end
, u64 max_bytes
);
557 struct extent_buffer
*alloc_test_extent_buffer(struct btrfs_fs_info
*fs_info
,