4 #include <linux/rbtree.h>
7 /* bits for the extent state */
8 #define EXTENT_DIRTY (1U << 0)
9 #define EXTENT_WRITEBACK (1U << 1)
10 #define EXTENT_UPTODATE (1U << 2)
11 #define EXTENT_LOCKED (1U << 3)
12 #define EXTENT_NEW (1U << 4)
13 #define EXTENT_DELALLOC (1U << 5)
14 #define EXTENT_DEFRAG (1U << 6)
15 #define EXTENT_BOUNDARY (1U << 9)
16 #define EXTENT_NODATASUM (1U << 10)
17 #define EXTENT_DO_ACCOUNTING (1U << 11)
18 #define EXTENT_FIRST_DELALLOC (1U << 12)
19 #define EXTENT_NEED_WAIT (1U << 13)
20 #define EXTENT_DAMAGED (1U << 14)
21 #define EXTENT_NORESERVE (1U << 15)
22 #define EXTENT_QGROUP_RESERVED (1U << 16)
23 #define EXTENT_CLEAR_DATA_RESV (1U << 17)
24 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
25 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
28 * flags for bio submission. The high bits indicate the compression
31 #define EXTENT_BIO_COMPRESSED 1
32 #define EXTENT_BIO_TREE_LOG 2
33 #define EXTENT_BIO_FLAG_SHIFT 16
35 /* these are bit numbers for test/set bit */
36 #define EXTENT_BUFFER_UPTODATE 0
37 #define EXTENT_BUFFER_DIRTY 2
38 #define EXTENT_BUFFER_CORRUPT 3
39 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
40 #define EXTENT_BUFFER_TREE_REF 5
41 #define EXTENT_BUFFER_STALE 6
42 #define EXTENT_BUFFER_WRITEBACK 7
43 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
44 #define EXTENT_BUFFER_DUMMY 9
45 #define EXTENT_BUFFER_IN_TREE 10
46 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
48 /* these are flags for __process_pages_contig */
49 #define PAGE_UNLOCK (1 << 0)
50 #define PAGE_CLEAR_DIRTY (1 << 1)
51 #define PAGE_SET_WRITEBACK (1 << 2)
52 #define PAGE_END_WRITEBACK (1 << 3)
53 #define PAGE_SET_PRIVATE2 (1 << 4)
54 #define PAGE_SET_ERROR (1 << 5)
55 #define PAGE_LOCK (1 << 6)
58 * page->private values. Every page that is controlled by the extent
59 * map has page->private set to one.
61 #define EXTENT_PAGE_PRIVATE 1
64 * The extent buffer bitmap operations are done with byte granularity instead of
65 * word granularity for two reasons:
66 * 1. The bitmaps must be little-endian on disk.
67 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a
68 * single word in a bitmap may straddle two pages in the extent buffer.
70 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE)
71 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1)
72 #define BITMAP_FIRST_BYTE_MASK(start) \
73 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK)
74 #define BITMAP_LAST_BYTE_MASK(nbits) \
75 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1)))
77 static inline int le_test_bit(int nr, const u8 *addr)
79 return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1)));
82 extern void le_bitmap_set(u8 *map, unsigned int start, int len);
83 extern void le_bitmap_clear(u8 *map, unsigned int start, int len);
88 struct io_failure_record;
90 typedef int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio,
91 int mirror_num, unsigned long bio_flags,
93 struct extent_io_ops {
94 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
95 u64 start, u64 end, int *page_started,
96 unsigned long *nr_written);
97 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
98 extent_submit_bio_hook_t *submit_bio_hook;
99 int (*merge_bio_hook)(struct page *page, unsigned long offset,
100 size_t size, struct bio *bio,
101 unsigned long bio_flags);
102 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
103 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
104 struct page *page, u64 start, u64 end,
106 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
107 struct extent_state *state, int uptodate);
108 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
110 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
112 void (*merge_extent_hook)(struct inode *inode,
113 struct extent_state *new,
114 struct extent_state *other);
115 void (*split_extent_hook)(struct inode *inode,
116 struct extent_state *orig, u64 split);
119 struct extent_io_tree {
120 struct rb_root state;
121 struct address_space *mapping;
125 const struct extent_io_ops *ops;
128 struct extent_state {
130 u64 end; /* inclusive */
131 struct rb_node rb_node;
133 /* ADD NEW ELEMENTS AFTER THIS */
134 wait_queue_head_t wq;
138 struct io_failure_record *failrec;
140 #ifdef CONFIG_BTRFS_DEBUG
141 struct list_head leak_list;
145 #define INLINE_EXTENT_BUFFER_PAGES 16
146 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE)
147 struct extent_buffer {
150 unsigned long bflags;
151 struct btrfs_fs_info *fs_info;
152 spinlock_t refs_lock;
156 struct rcu_head rcu_head;
159 /* count of read lock holders on the extent buffer */
160 atomic_t write_locks;
162 atomic_t blocking_writers;
163 atomic_t blocking_readers;
164 atomic_t spinning_readers;
165 atomic_t spinning_writers;
167 /* >= 0 if eb belongs to a log tree, -1 otherwise */
170 /* protects write locks */
173 /* readers use lock_wq while they wait for the write
174 * lock holders to unlock
176 wait_queue_head_t write_lock_wq;
178 /* writers use read_lock_wq while they wait for readers
181 wait_queue_head_t read_lock_wq;
182 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
183 #ifdef CONFIG_BTRFS_DEBUG
184 struct list_head leak_list;
189 * Structure to record how many bytes and which ranges are set/cleared
191 struct extent_changeset {
192 /* How many bytes are set/cleared in this operation */
196 struct ulist range_changed;
199 static inline void extent_set_compress_type(unsigned long *bio_flags,
202 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
205 static inline int extent_compress_type(unsigned long bio_flags)
207 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
210 struct extent_map_tree;
212 typedef struct extent_map *(get_extent_t)(struct inode *inode,
218 void extent_io_tree_init(struct extent_io_tree *tree,
219 struct address_space *mapping);
220 int try_release_extent_mapping(struct extent_map_tree *map,
221 struct extent_io_tree *tree, struct page *page,
223 int try_release_extent_buffer(struct page *page);
224 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
225 struct extent_state **cached);
227 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
229 return lock_extent_bits(tree, start, end, NULL);
232 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
233 int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
234 get_extent_t *get_extent, int mirror_num);
235 int __init extent_io_init(void);
236 void extent_io_exit(void);
238 u64 count_range_bits(struct extent_io_tree *tree,
239 u64 *start, u64 search_end,
240 u64 max_bytes, unsigned bits, int contig);
242 void free_extent_state(struct extent_state *state);
243 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
244 unsigned bits, int filled,
245 struct extent_state *cached_state);
246 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
247 unsigned bits, struct extent_changeset *changeset);
248 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
249 unsigned bits, int wake, int delete,
250 struct extent_state **cached, gfp_t mask);
252 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
254 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
258 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
259 u64 end, struct extent_state **cached, gfp_t mask)
261 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
265 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
266 u64 end, unsigned bits)
270 if (bits & EXTENT_LOCKED)
273 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL,
277 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
278 unsigned bits, struct extent_changeset *changeset);
279 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
280 unsigned bits, u64 *failed_start,
281 struct extent_state **cached_state, gfp_t mask);
283 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
284 u64 end, unsigned bits)
286 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS);
289 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
290 u64 end, struct extent_state **cached_state, gfp_t mask)
292 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
296 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
299 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
303 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
306 return clear_extent_bit(tree, start, end,
307 EXTENT_DIRTY | EXTENT_DELALLOC |
308 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS);
311 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
312 unsigned bits, unsigned clear_bits,
313 struct extent_state **cached_state);
315 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
316 u64 end, struct extent_state **cached_state)
318 return set_extent_bit(tree, start, end,
319 EXTENT_DELALLOC | EXTENT_UPTODATE,
320 NULL, cached_state, GFP_NOFS);
323 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
324 u64 end, struct extent_state **cached_state)
326 return set_extent_bit(tree, start, end,
327 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
328 NULL, cached_state, GFP_NOFS);
331 static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
334 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL,
338 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
339 u64 end, struct extent_state **cached_state, gfp_t mask)
341 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
345 int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
346 u64 *start_ret, u64 *end_ret, unsigned bits,
347 struct extent_state **cached_state);
348 int extent_invalidatepage(struct extent_io_tree *tree,
349 struct page *page, unsigned long offset);
350 int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
351 get_extent_t *get_extent,
352 struct writeback_control *wbc);
353 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
354 u64 start, u64 end, get_extent_t *get_extent,
356 int extent_writepages(struct extent_io_tree *tree,
357 struct address_space *mapping,
358 get_extent_t *get_extent,
359 struct writeback_control *wbc);
360 int btree_write_cache_pages(struct address_space *mapping,
361 struct writeback_control *wbc);
362 int extent_readpages(struct extent_io_tree *tree,
363 struct address_space *mapping,
364 struct list_head *pages, unsigned nr_pages,
365 get_extent_t get_extent);
366 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
367 __u64 start, __u64 len, get_extent_t *get_extent);
368 void set_page_extent_mapped(struct page *page);
370 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
372 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
373 u64 start, unsigned long len);
374 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
376 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
377 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
379 void free_extent_buffer(struct extent_buffer *eb);
380 void free_extent_buffer_stale(struct extent_buffer *eb);
382 #define WAIT_COMPLETE 1
383 #define WAIT_PAGE_LOCK 2
384 int read_extent_buffer_pages(struct extent_io_tree *tree,
385 struct extent_buffer *eb, int wait,
386 get_extent_t *get_extent, int mirror_num);
387 void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
389 static inline unsigned long num_extent_pages(u64 start, u64 len)
391 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) -
392 (start >> PAGE_SHIFT);
395 static inline void extent_buffer_get(struct extent_buffer *eb)
397 atomic_inc(&eb->refs);
400 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
403 void read_extent_buffer(struct extent_buffer *eb, void *dst,
406 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
409 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src);
410 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb,
412 void write_extent_buffer(struct extent_buffer *eb, const void *src,
413 unsigned long start, unsigned long len);
414 void copy_extent_buffer_full(struct extent_buffer *dst,
415 struct extent_buffer *src);
416 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
417 unsigned long dst_offset, unsigned long src_offset,
419 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
420 unsigned long src_offset, unsigned long len);
421 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
422 unsigned long src_offset, unsigned long len);
423 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start,
425 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
427 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
428 unsigned long pos, unsigned long len);
429 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
430 unsigned long pos, unsigned long len);
431 void clear_extent_buffer_dirty(struct extent_buffer *eb);
432 int set_extent_buffer_dirty(struct extent_buffer *eb);
433 void set_extent_buffer_uptodate(struct extent_buffer *eb);
434 void clear_extent_buffer_uptodate(struct extent_buffer *eb);
435 int extent_buffer_uptodate(struct extent_buffer *eb);
436 int extent_buffer_under_io(struct extent_buffer *eb);
437 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
438 unsigned long min_len, char **map,
439 unsigned long *map_start,
440 unsigned long *map_len);
441 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
442 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
443 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
444 u64 delalloc_end, struct page *locked_page,
445 unsigned bits_to_clear,
446 unsigned long page_ops);
448 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
450 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
451 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
453 struct btrfs_fs_info;
455 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
456 struct page *page, unsigned int pg_offset,
458 int clean_io_failure(struct inode *inode, u64 start, struct page *page,
459 unsigned int pg_offset);
460 void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
461 int repair_eb_io_failure(struct btrfs_fs_info *fs_info,
462 struct extent_buffer *eb, int mirror_num);
465 * When IO fails, either with EIO or csum verification fails, we
466 * try other mirrors that might have a good copy of the data. This
467 * io_failure_record is used to record state as we go through all the
468 * mirrors. If another mirror has good data, the page is set up to date
469 * and things continue. If a good mirror can't be found, the original
470 * bio end_io callback is called to indicate things have failed.
472 struct io_failure_record {
477 unsigned long bio_flags;
485 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
486 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
487 struct io_failure_record **failrec_ret);
488 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
489 struct io_failure_record *failrec, int fail_mirror);
490 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
491 struct io_failure_record *failrec,
492 struct page *page, int pg_offset, int icsum,
493 bio_end_io_t *endio_func, void *data);
494 int free_io_failure(struct btrfs_inode *inode, struct io_failure_record *rec);
495 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
496 noinline u64 find_lock_delalloc_range(struct inode *inode,
497 struct extent_io_tree *tree,
498 struct page *locked_page, u64 *start,
499 u64 *end, u64 max_bytes);
501 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,