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block: use DAX for partition table reads
[deliverable/linux.git] / fs / btrfs / extent_io.h
CommitLineData
d1310b2e
CM		 1#ifndef __EXTENTIO__
2#define __EXTENTIO__
3
4#include <linux/rbtree.h>
ac467772 5#include "ulist.h"
d1310b2e
CM		 6
7/* bits for the extent state */
9ee49a04
DS		 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)
52472553 22#define EXTENT_QGROUP_RESERVED (1U << 16)
9ee49a04
DS		 23#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
24#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
d1310b2e 25
261507a0
LZ		 26/*
27 * flags for bio submission. The high bits indicate the compression
28 * type for this bio
29 */
c8b97818 30#define EXTENT_BIO_COMPRESSED 1
de0022b9 31#define EXTENT_BIO_TREE_LOG 2
4b384318 32#define EXTENT_BIO_PARENT_LOCKED 4
261507a0 33#define EXTENT_BIO_FLAG_SHIFT 16
c8b97818 34
b4ce94de
CM		 35/* these are bit numbers for test/set bit */
36#define EXTENT_BUFFER_UPTODATE 0
b9473439 37#define EXTENT_BUFFER_DIRTY 2
a826d6dc 38#define EXTENT_BUFFER_CORRUPT 3
ab0fff03 39#define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */
3083ee2e
JB		 40#define EXTENT_BUFFER_TREE_REF 5
41#define EXTENT_BUFFER_STALE 6
0b32f4bb 42#define EXTENT_BUFFER_WRITEBACK 7
656f30db 43#define EXTENT_BUFFER_READ_ERR 8 /* read IO error */
815a51c7 44#define EXTENT_BUFFER_DUMMY 9
34b41ace 45#define EXTENT_BUFFER_IN_TREE 10
656f30db 46#define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */
b4ce94de 47
a791e35e 48/* these are flags for extent_clear_unlock_delalloc */
c2790a2e
JB		 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)
704de49d 54#define PAGE_SET_ERROR (1 << 5)
a791e35e 55
d1310b2e
CM		 56/*
57 * page->private values. Every page that is controlled by the extent
58 * map has page->private set to one.
59 */
60#define EXTENT_PAGE_PRIVATE 1
d1310b2e 61
70dec807 62struct extent_state;
ea466794 63struct btrfs_root;
facc8a22 64struct btrfs_io_bio;
70dec807 65
44b8bd7e 66typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw,
c8b97818 67 struct bio *bio, int mirror_num,
eaf25d93 68 unsigned long bio_flags, u64 bio_offset);
d1310b2e 69struct extent_io_ops {
c8b97818 70 int (*fill_delalloc)(struct inode *inode, struct page *locked_page,
771ed689
CM		 71 u64 start, u64 end, int *page_started,
72 unsigned long *nr_written);
247e743c 73 int (*writepage_start_hook)(struct page *page, u64 start, u64 end);
d1310b2e 74 int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
44b8bd7e 75 extent_submit_bio_hook_t *submit_bio_hook;
64a16701 76 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset,
c8b97818
CM		 77 size_t size, struct bio *bio,
78 unsigned long bio_flags);
ea466794 79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror);
facc8a22
MX		 80 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset,
81 struct page *page, u64 start, u64 end,
82 int mirror);
1259ab75 83 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end,
e6dcd2dc 84 struct extent_state *state, int uptodate);
1bf85046 85 void (*set_bit_hook)(struct inode *inode, struct extent_state *state,
9ee49a04 86 unsigned *bits);
1bf85046 87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
9ee49a04 88 unsigned *bits);
1bf85046
JM		 89 void (*merge_extent_hook)(struct inode *inode,
90 struct extent_state *new,
91 struct extent_state *other);
92 void (*split_extent_hook)(struct inode *inode,
93 struct extent_state *orig, u64 split);
d1310b2e
CM		 94};
95
96struct extent_io_tree {
97 struct rb_root state;
98 struct address_space *mapping;
99 u64 dirty_bytes;
0b32f4bb 100 int track_uptodate;
70dec807 101 spinlock_t lock;
e8c9f186 102 const struct extent_io_ops *ops;
d1310b2e
CM		 103};
104
105struct extent_state {
106 u64 start;
107 u64 end; /* inclusive */
d1310b2e 108 struct rb_node rb_node;
9ed74f2d
JB		 109
110 /* ADD NEW ELEMENTS AFTER THIS */
d1310b2e
CM		 111 wait_queue_head_t wq;
112 atomic_t refs;
9ee49a04 113 unsigned state;
d1310b2e
CM		 114
115 /* for use by the FS */
116 u64 private;
117
6d49ba1b 118#ifdef CONFIG_BTRFS_DEBUG
2d2ae547 119 struct list_head leak_list;
6d49ba1b 120#endif
d1310b2e
CM		 121};
122
727011e0
CM		 123#define INLINE_EXTENT_BUFFER_PAGES 16
124#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
d1310b2e
CM		 125struct extent_buffer {
126 u64 start;
127 unsigned long len;
b4ce94de 128 unsigned long bflags;
f28491e0 129 struct btrfs_fs_info *fs_info;
3083ee2e 130 spinlock_t refs_lock;
727011e0 131 atomic_t refs;
0b32f4bb 132 atomic_t io_pages;
5cf1ab56 133 int read_mirror;
19fe0a8b 134 struct rcu_head rcu_head;
5b25f70f 135 pid_t lock_owner;
b4ce94de 136
bd681513
CM		 137 /* count of read lock holders on the extent buffer */
138 atomic_t write_locks;
139 atomic_t read_locks;
140 atomic_t blocking_writers;
141 atomic_t blocking_readers;
142 atomic_t spinning_readers;
143 atomic_t spinning_writers;
656f30db
FM		 144 short lock_nested;
145 /* >= 0 if eb belongs to a log tree, -1 otherwise */
146 short log_index;
bd681513
CM		 147
148 /* protects write locks */
149 rwlock_t lock;
150
151 /* readers use lock_wq while they wait for the write
152 * lock holders to unlock
153 */
154 wait_queue_head_t write_lock_wq;
b4ce94de 155
bd681513
CM		 156 /* writers use read_lock_wq while they wait for readers
157 * to unlock
b4ce94de 158 */
bd681513 159 wait_queue_head_t read_lock_wq;
b8dae313 160 struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
6d49ba1b
ES		 161#ifdef CONFIG_BTRFS_DEBUG
162 struct list_head leak_list;
163#endif
d1310b2e
CM		 164};
165
ac467772
QW		 166/*
167 * Structure to record how many bytes and which ranges are set/cleared
168 */
169struct extent_changeset {
170 /* How many bytes are set/cleared in this operation */
171 u64 bytes_changed;
172
173 /* Changed ranges */
174 struct ulist *range_changed;
175};
176
261507a0
LZ		 177static inline void extent_set_compress_type(unsigned long *bio_flags,
178 int compress_type)
179{
180 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
181}
182
183static inline int extent_compress_type(unsigned long bio_flags)
184{
185 return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
186}
187
d1310b2e
CM		 188struct extent_map_tree;
189
190typedef struct extent_map *(get_extent_t)(struct inode *inode,
191 struct page *page,
306e16ce 192 size_t pg_offset,
d1310b2e
CM		 193 u64 start, u64 len,
194 int create);
195
196void extent_io_tree_init(struct extent_io_tree *tree,
f993c883 197 struct address_space *mapping);
d1310b2e 198int try_release_extent_mapping(struct extent_map_tree *map,
70dec807
CM		 199 struct extent_io_tree *tree, struct page *page,
200 gfp_t mask);
f7a52a40 201int try_release_extent_buffer(struct page *page);
1edbb734 202int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
ff13db41 203 struct extent_state **cached);
cd716d8f
DS		 204
205static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end)
206{
207 return lock_extent_bits(tree, start, end, NULL);
208}
209
d0082371 210int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end);
d1310b2e 211int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
8ddc7d9c 212 get_extent_t *get_extent, int mirror_num);
4b384318
MF		 213int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page,
214 get_extent_t *get_extent, int mirror_num);
d1310b2e
CM		 215int __init extent_io_init(void);
216void extent_io_exit(void);
217
218u64 count_range_bits(struct extent_io_tree *tree,
219 u64 *start, u64 search_end,
9ee49a04 220 u64 max_bytes, unsigned bits, int contig);
d1310b2e 221
4845e44f 222void free_extent_state(struct extent_state *state);
d1310b2e 223int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04 224 unsigned bits, int filled,
41074888 225 struct extent_state *cached_state);
fefdc557
QW		 226int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
227 unsigned bits, gfp_t mask,
228 struct extent_changeset *changeset);
e6dcd2dc 229int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04 230 unsigned bits, int wake, int delete,
41074888 231 struct extent_state **cached, gfp_t mask);
c6317955 232
e83b1d91
DS		 233static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end)
234{
235 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL,
236 GFP_NOFS);
237}
238
239static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start,
240 u64 end, struct extent_state **cached, gfp_t mask)
241{
242 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached,
243 mask);
244}
245
246static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start,
247 u64 end, unsigned bits, gfp_t mask)
248{
249 int wake = 0;
250
251 if (bits & EXTENT_LOCKED)
252 wake = 1;
253
254 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, mask);
255}
256
d38ed27f
QW		 257int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
258 unsigned bits, gfp_t mask,
259 struct extent_changeset *changeset);
4845e44f 260int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04 261 unsigned bits, u64 *failed_start,
4845e44f 262 struct extent_state **cached_state, gfp_t mask);
c6317955
DS		 263
264static inline int set_extent_bits(struct extent_io_tree *tree, u64 start,
265 u64 end, unsigned bits, gfp_t mask)
266{
267 return set_extent_bit(tree, start, end, bits, NULL, NULL, mask);
268}
269
e83b1d91
DS		 270static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
271 u64 end, struct extent_state **cached_state, gfp_t mask)
272{
273 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
274 cached_state, mask);
275}
c6317955
DS		 276
277static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start,
278 u64 end, gfp_t mask)
279{
280 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL,
281 NULL, mask);
282}
283
e83b1d91
DS		 284static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start,
285 u64 end, gfp_t mask)
286{
287 return clear_extent_bit(tree, start, end,
288 EXTENT_DIRTY | EXTENT_DELALLOC |
289 EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask);
290}
291
462d6fac 292int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
9ee49a04 293 unsigned bits, unsigned clear_bits,
e6138876 294 struct extent_state **cached_state, gfp_t mask);
c6317955
DS		 295
296static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start,
297 u64 end, struct extent_state **cached_state, gfp_t mask)
298{
299 return set_extent_bit(tree, start, end,
300 EXTENT_DELALLOC | EXTENT_UPTODATE,
301 NULL, cached_state, mask);
302}
303
304static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start,
305 u64 end, struct extent_state **cached_state, gfp_t mask)
306{
307 return set_extent_bit(tree, start, end,
308 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG,
309 NULL, cached_state, mask);
310}
311
312static inline int set_extent_new(struct extent_io_tree *tree, u64 start,
313 u64 end, gfp_t mask)
314{
315 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, mask);
316}
317
318static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start,
319 u64 end, struct extent_state **cached_state, gfp_t mask)
320{
321 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL,
322 cached_state, mask);
323}
324
d1310b2e 325int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
9ee49a04 326 u64 *start_ret, u64 *end_ret, unsigned bits,
e6138876 327 struct extent_state **cached_state);
d1310b2e
CM		 328int extent_invalidatepage(struct extent_io_tree *tree,
329 struct page *page, unsigned long offset);
330int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
331 get_extent_t *get_extent,
332 struct writeback_control *wbc);
771ed689
CM		 333int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode,
334 u64 start, u64 end, get_extent_t *get_extent,
335 int mode);
d1310b2e
CM		 336int extent_writepages(struct extent_io_tree *tree,
337 struct address_space *mapping,
338 get_extent_t *get_extent,
339 struct writeback_control *wbc);
0b32f4bb
JB		 340int btree_write_cache_pages(struct address_space *mapping,
341 struct writeback_control *wbc);
d1310b2e
CM		 342int extent_readpages(struct extent_io_tree *tree,
343 struct address_space *mapping,
344 struct list_head *pages, unsigned nr_pages,
345 get_extent_t get_extent);
1506fcc8
YS		 346int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
347 __u64 start, __u64 len, get_extent_t *get_extent);
d1310b2e
CM		 348int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
349void set_page_extent_mapped(struct page *page);
350
f28491e0 351struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
ce3e6984 352 u64 start);
0f331229
OS		 353struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
354 u64 start, unsigned long len);
3f556f78 355struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info,
0f331229 356 u64 start);
815a51c7 357struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src);
f28491e0 358struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
452c75c3 359 u64 start);
d1310b2e 360void free_extent_buffer(struct extent_buffer *eb);
3083ee2e 361void free_extent_buffer_stale(struct extent_buffer *eb);
bb82ab88
AJ		 362#define WAIT_NONE 0
363#define WAIT_COMPLETE 1
364#define WAIT_PAGE_LOCK 2
d1310b2e 365int read_extent_buffer_pages(struct extent_io_tree *tree,
a86c12c7 366 struct extent_buffer *eb, u64 start, int wait,
f188591e 367 get_extent_t *get_extent, int mirror_num);
fd8b2b61 368void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
479ed9ab
RD		 369
370static inline unsigned long num_extent_pages(u64 start, u64 len)
371{
372 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
373 (start >> PAGE_CACHE_SHIFT);
374}
375
d1310b2e
CM		 376static inline void extent_buffer_get(struct extent_buffer *eb)
377{
378 atomic_inc(&eb->refs);
379}
380
381int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
382 unsigned long start,
383 unsigned long len);
384void read_extent_buffer(struct extent_buffer *eb, void *dst,
385 unsigned long start,
386 unsigned long len);
550ac1d8
GH		 387int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst,
388 unsigned long start,
389 unsigned long len);
d1310b2e
CM		 390void write_extent_buffer(struct extent_buffer *eb, const void *src,
391 unsigned long start, unsigned long len);
392void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
393 unsigned long dst_offset, unsigned long src_offset,
394 unsigned long len);
395void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
396 unsigned long src_offset, unsigned long len);
397void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
398 unsigned long src_offset, unsigned long len);
399void memset_extent_buffer(struct extent_buffer *eb, char c,
400 unsigned long start, unsigned long len);
3e1e8bb7
OS		 401int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start,
402 unsigned long pos);
403void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start,
404 unsigned long pos, unsigned long len);
405void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start,
406 unsigned long pos, unsigned long len);
1d4284bd 407void clear_extent_buffer_dirty(struct extent_buffer *eb);
0b32f4bb 408int set_extent_buffer_dirty(struct extent_buffer *eb);
09c25a8c 409void set_extent_buffer_uptodate(struct extent_buffer *eb);
69ba3927 410void clear_extent_buffer_uptodate(struct extent_buffer *eb);
0b32f4bb 411int extent_buffer_uptodate(struct extent_buffer *eb);
a26e8c9f 412int extent_buffer_under_io(struct extent_buffer *eb);
d1310b2e 413int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
a6591715 414 unsigned long min_len, char **map,
d1310b2e 415 unsigned long *map_start,
a6591715 416 unsigned long *map_len);
bd1fa4f0 417void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end);
f6311572 418void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end);
a9d93e17 419void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end,
c2790a2e 420 struct page *locked_page,
9ee49a04 421 unsigned bits_to_clear,
c2790a2e 422 unsigned long page_ops);
88f794ed
MX		 423struct bio *
424btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
425 gfp_t gfp_flags);
9be3395b
CM		 426struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs);
427struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask);
4a54c8c1 428
3ec706c8 429struct btrfs_fs_info;
4a54c8c1 430
1203b681
MX		 431int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical,
432 struct page *page, unsigned int pg_offset,
433 int mirror_num);
8b110e39
MX		 434int clean_io_failure(struct inode *inode, u64 start, struct page *page,
435 unsigned int pg_offset);
b5227c07 436void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
ea466794
JB		 437int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
438 int mirror_num);
2fe6303e
MX		 439
440/*
441 * When IO fails, either with EIO or csum verification fails, we
442 * try other mirrors that might have a good copy of the data. This
443 * io_failure_record is used to record state as we go through all the
444 * mirrors. If another mirror has good data, the page is set up to date
445 * and things continue. If a good mirror can't be found, the original
446 * bio end_io callback is called to indicate things have failed.
447 */
448struct io_failure_record {
449 struct page *page;
450 u64 start;
451 u64 len;
452 u64 logical;
453 unsigned long bio_flags;
454 int this_mirror;
455 int failed_mirror;
456 int in_validation;
457};
458
f612496b 459void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end);
2fe6303e
MX		 460int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end,
461 struct io_failure_record **failrec_ret);
462int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio,
463 struct io_failure_record *failrec, int fail_mirror);
464struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio,
465 struct io_failure_record *failrec,
466 struct page *page, int pg_offset, int icsum,
8b110e39
MX		 467 bio_end_io_t *endio_func, void *data);
468int free_io_failure(struct inode *inode, struct io_failure_record *rec);
294e30fe
JB		 469#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
470noinline u64 find_lock_delalloc_range(struct inode *inode,
471 struct extent_io_tree *tree,
472 struct page *locked_page, u64 *start,
473 u64 *end, u64 max_bytes);
0d4cf4e6 474#endif
faa2dbf0 475struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
ce3e6984 476 u64 start);
294e30fe 477#endif
Linux kernel - Deliverables
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