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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
9888c340 DS |
2 | |
3 | #ifndef BTRFS_EXTENT_IO_H | |
4 | #define BTRFS_EXTENT_IO_H | |
d1310b2e CM |
5 | |
6 | #include <linux/rbtree.h> | |
b7ac31b7 | 7 | #include <linux/refcount.h> |
10c5db28 | 8 | #include <linux/fiemap.h> |
deb67895 | 9 | #include <linux/btrfs_tree.h> |
0ff40013 | 10 | #include "compression.h" |
ac467772 | 11 | #include "ulist.h" |
d1310b2e | 12 | |
80cb3836 DS |
13 | enum { |
14 | EXTENT_BUFFER_UPTODATE, | |
15 | EXTENT_BUFFER_DIRTY, | |
16 | EXTENT_BUFFER_CORRUPT, | |
17 | /* this got triggered by readahead */ | |
18 | EXTENT_BUFFER_READAHEAD, | |
19 | EXTENT_BUFFER_TREE_REF, | |
20 | EXTENT_BUFFER_STALE, | |
21 | EXTENT_BUFFER_WRITEBACK, | |
22 | /* read IO error */ | |
23 | EXTENT_BUFFER_READ_ERR, | |
24 | EXTENT_BUFFER_UNMAPPED, | |
25 | EXTENT_BUFFER_IN_TREE, | |
26 | /* write IO error */ | |
27 | EXTENT_BUFFER_WRITE_ERR, | |
d3575156 | 28 | EXTENT_BUFFER_NO_CHECK, |
80cb3836 | 29 | }; |
b4ce94de | 30 | |
da2c7009 | 31 | /* these are flags for __process_pages_contig */ |
c2790a2e | 32 | #define PAGE_UNLOCK (1 << 0) |
6869b0a8 QW |
33 | /* Page starts writeback, clear dirty bit and set writeback bit */ |
34 | #define PAGE_START_WRITEBACK (1 << 1) | |
35 | #define PAGE_END_WRITEBACK (1 << 2) | |
f57ad937 | 36 | #define PAGE_SET_ORDERED (1 << 3) |
6869b0a8 QW |
37 | #define PAGE_SET_ERROR (1 << 4) |
38 | #define PAGE_LOCK (1 << 5) | |
a791e35e | 39 | |
d1310b2e CM |
40 | /* |
41 | * page->private values. Every page that is controlled by the extent | |
42 | * map has page->private set to one. | |
43 | */ | |
44 | #define EXTENT_PAGE_PRIVATE 1 | |
d1310b2e | 45 | |
2fe1d551 OS |
46 | /* |
47 | * The extent buffer bitmap operations are done with byte granularity instead of | |
48 | * word granularity for two reasons: | |
49 | * 1. The bitmaps must be little-endian on disk. | |
50 | * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a | |
51 | * single word in a bitmap may straddle two pages in the extent buffer. | |
52 | */ | |
53 | #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) | |
54 | #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) | |
55 | #define BITMAP_FIRST_BYTE_MASK(start) \ | |
56 | ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) | |
57 | #define BITMAP_LAST_BYTE_MASK(nbits) \ | |
58 | (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) | |
59 | ||
ea466794 | 60 | struct btrfs_root; |
6fc0ef68 | 61 | struct btrfs_inode; |
facc8a22 | 62 | struct btrfs_io_bio; |
183ebab7 | 63 | struct btrfs_fs_info; |
47dc196a | 64 | struct io_failure_record; |
9c7d3a54 | 65 | struct extent_io_tree; |
a758781d | 66 | |
ad357938 | 67 | typedef void (submit_bio_hook_t)(struct inode *inode, struct bio *bio, |
77d5d689 | 68 | int mirror_num, |
cb3a12d9 | 69 | enum btrfs_compression_type compress_type); |
77d5d689 | 70 | |
8896a08d | 71 | typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode, |
1941b64b | 72 | struct bio *bio, u64 dio_file_offset); |
a758781d | 73 | |
deb67895 | 74 | #define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE) |
d1310b2e CM |
75 | struct extent_buffer { |
76 | u64 start; | |
77 | unsigned long len; | |
b4ce94de | 78 | unsigned long bflags; |
f28491e0 | 79 | struct btrfs_fs_info *fs_info; |
3083ee2e | 80 | spinlock_t refs_lock; |
727011e0 | 81 | atomic_t refs; |
0b32f4bb | 82 | atomic_t io_pages; |
5cf1ab56 | 83 | int read_mirror; |
19fe0a8b | 84 | struct rcu_head rcu_head; |
5b25f70f | 85 | pid_t lock_owner; |
656f30db | 86 | /* >= 0 if eb belongs to a log tree, -1 otherwise */ |
dc516164 DS |
87 | s8 log_index; |
88 | ||
89 | struct rw_semaphore lock; | |
bd681513 | 90 | |
b8dae313 | 91 | struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; |
d3575156 | 92 | struct list_head release_list; |
6d49ba1b ES |
93 | #ifdef CONFIG_BTRFS_DEBUG |
94 | struct list_head leak_list; | |
95 | #endif | |
d1310b2e CM |
96 | }; |
97 | ||
ac467772 QW |
98 | /* |
99 | * Structure to record how many bytes and which ranges are set/cleared | |
100 | */ | |
101 | struct extent_changeset { | |
102 | /* How many bytes are set/cleared in this operation */ | |
b642b52d | 103 | u64 bytes_changed; |
ac467772 QW |
104 | |
105 | /* Changed ranges */ | |
53d32359 | 106 | struct ulist range_changed; |
ac467772 QW |
107 | }; |
108 | ||
364ecf36 QW |
109 | static inline void extent_changeset_init(struct extent_changeset *changeset) |
110 | { | |
111 | changeset->bytes_changed = 0; | |
112 | ulist_init(&changeset->range_changed); | |
113 | } | |
114 | ||
115 | static inline struct extent_changeset *extent_changeset_alloc(void) | |
116 | { | |
117 | struct extent_changeset *ret; | |
118 | ||
119 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); | |
120 | if (!ret) | |
121 | return NULL; | |
122 | ||
123 | extent_changeset_init(ret); | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static inline void extent_changeset_release(struct extent_changeset *changeset) | |
128 | { | |
129 | if (!changeset) | |
130 | return; | |
131 | changeset->bytes_changed = 0; | |
132 | ulist_release(&changeset->range_changed); | |
133 | } | |
134 | ||
135 | static inline void extent_changeset_free(struct extent_changeset *changeset) | |
136 | { | |
137 | if (!changeset) | |
138 | return; | |
139 | extent_changeset_release(changeset); | |
140 | kfree(changeset); | |
141 | } | |
142 | ||
d1310b2e CM |
143 | struct extent_map_tree; |
144 | ||
fc4f21b1 | 145 | typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, |
39b07b5d OS |
146 | struct page *page, size_t pg_offset, |
147 | u64 start, u64 len); | |
d1310b2e | 148 | |
477a30ba | 149 | int try_release_extent_mapping(struct page *page, gfp_t mask); |
f7a52a40 | 150 | int try_release_extent_buffer(struct page *page); |
cd716d8f | 151 | |
7aab8b32 | 152 | int btrfs_readpage(struct file *file, struct page *page); |
0a9b0e53 | 153 | int extent_write_full_page(struct page *page, struct writeback_control *wbc); |
2bd0fc93 | 154 | int extent_write_locked_range(struct inode *inode, u64 start, u64 end); |
8ae225a8 | 155 | int extent_writepages(struct address_space *mapping, |
d1310b2e | 156 | struct writeback_control *wbc); |
0b32f4bb JB |
157 | int btree_write_cache_pages(struct address_space *mapping, |
158 | struct writeback_control *wbc); | |
ba206a02 | 159 | void extent_readahead(struct readahead_control *rac); |
facee0a0 | 160 | int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo, |
bab16e21 | 161 | u64 start, u64 len); |
32443de3 QW |
162 | int set_page_extent_mapped(struct page *page); |
163 | void clear_page_extent_mapped(struct page *page); | |
d1310b2e | 164 | |
f28491e0 | 165 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
3fbaf258 | 166 | u64 start, u64 owner_root, int level); |
0f331229 OS |
167 | struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
168 | u64 start, unsigned long len); | |
3f556f78 | 169 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 170 | u64 start); |
2b48966a | 171 | struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src); |
f28491e0 | 172 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
452c75c3 | 173 | u64 start); |
d1310b2e | 174 | void free_extent_buffer(struct extent_buffer *eb); |
3083ee2e | 175 | void free_extent_buffer_stale(struct extent_buffer *eb); |
bb82ab88 AJ |
176 | #define WAIT_NONE 0 |
177 | #define WAIT_COMPLETE 1 | |
178 | #define WAIT_PAGE_LOCK 2 | |
c2ccfbc6 | 179 | int read_extent_buffer_pages(struct extent_buffer *eb, int wait, |
6af49dbd | 180 | int mirror_num); |
fd8b2b61 | 181 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb); |
bfb484d9 | 182 | void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info, |
3fbaf258 | 183 | u64 bytenr, u64 owner_root, u64 gen, int level); |
bfb484d9 | 184 | void btrfs_readahead_node_child(struct extent_buffer *node, int slot); |
479ed9ab | 185 | |
cc5e31a4 | 186 | static inline int num_extent_pages(const struct extent_buffer *eb) |
479ed9ab | 187 | { |
4a3dc938 QW |
188 | /* |
189 | * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to | |
190 | * sectorsize, it's just eb->len >> PAGE_SHIFT. | |
191 | * | |
192 | * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE, | |
193 | * thus have to ensure we get at least one page. | |
194 | */ | |
195 | return (eb->len >> PAGE_SHIFT) ?: 1; | |
479ed9ab RD |
196 | } |
197 | ||
2b48966a | 198 | static inline int extent_buffer_uptodate(const struct extent_buffer *eb) |
ba020491 AJ |
199 | { |
200 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); | |
201 | } | |
202 | ||
1cbb1f45 JM |
203 | int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
204 | unsigned long start, unsigned long len); | |
205 | void read_extent_buffer(const struct extent_buffer *eb, void *dst, | |
d1310b2e CM |
206 | unsigned long start, |
207 | unsigned long len); | |
a48b73ec JB |
208 | int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb, |
209 | void __user *dst, unsigned long start, | |
210 | unsigned long len); | |
2b48966a DS |
211 | void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src); |
212 | void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb, | |
f157bf76 | 213 | const void *src); |
2b48966a | 214 | void write_extent_buffer(const struct extent_buffer *eb, const void *src, |
d1310b2e | 215 | unsigned long start, unsigned long len); |
2b48966a DS |
216 | void copy_extent_buffer_full(const struct extent_buffer *dst, |
217 | const struct extent_buffer *src); | |
218 | void copy_extent_buffer(const struct extent_buffer *dst, | |
219 | const struct extent_buffer *src, | |
d1310b2e CM |
220 | unsigned long dst_offset, unsigned long src_offset, |
221 | unsigned long len); | |
2b48966a DS |
222 | void memcpy_extent_buffer(const struct extent_buffer *dst, |
223 | unsigned long dst_offset, unsigned long src_offset, | |
224 | unsigned long len); | |
225 | void memmove_extent_buffer(const struct extent_buffer *dst, | |
226 | unsigned long dst_offset, unsigned long src_offset, | |
b159fa28 | 227 | unsigned long len); |
2b48966a | 228 | void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start, |
b159fa28 | 229 | unsigned long len); |
2b48966a | 230 | int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start, |
3e1e8bb7 | 231 | unsigned long pos); |
2b48966a | 232 | void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start, |
3e1e8bb7 | 233 | unsigned long pos, unsigned long len); |
2b48966a DS |
234 | void extent_buffer_bitmap_clear(const struct extent_buffer *eb, |
235 | unsigned long start, unsigned long pos, | |
236 | unsigned long len); | |
237 | void clear_extent_buffer_dirty(const struct extent_buffer *eb); | |
abb57ef3 | 238 | bool set_extent_buffer_dirty(struct extent_buffer *eb); |
09c25a8c | 239 | void set_extent_buffer_uptodate(struct extent_buffer *eb); |
69ba3927 | 240 | void clear_extent_buffer_uptodate(struct extent_buffer *eb); |
2b48966a | 241 | int extent_buffer_under_io(const struct extent_buffer *eb); |
bd1fa4f0 | 242 | void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); |
f6311572 | 243 | void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); |
ad7ff17b | 244 | void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end, |
74e9194a | 245 | struct page *locked_page, |
f97e27e9 | 246 | u32 bits_to_clear, unsigned long page_ops); |
dd137dd1 STD |
247 | |
248 | int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array); | |
c3a3b19b | 249 | struct bio *btrfs_bio_alloc(unsigned int nr_iovecs); |
110ac0e5 | 250 | struct bio *btrfs_bio_clone(struct block_device *bdev, struct bio *bio); |
21dda654 | 251 | struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size); |
4a54c8c1 | 252 | |
b5227c07 | 253 | void end_extent_writepage(struct page *page, int err, u64 start, u64 end); |
2b48966a | 254 | int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num); |
2fe6303e MX |
255 | |
256 | /* | |
257 | * When IO fails, either with EIO or csum verification fails, we | |
258 | * try other mirrors that might have a good copy of the data. This | |
259 | * io_failure_record is used to record state as we go through all the | |
1245835d | 260 | * mirrors. If another mirror has good data, the sector is set up to date |
2fe6303e MX |
261 | * and things continue. If a good mirror can't be found, the original |
262 | * bio end_io callback is called to indicate things have failed. | |
263 | */ | |
264 | struct io_failure_record { | |
265 | struct page *page; | |
266 | u64 start; | |
267 | u64 len; | |
268 | u64 logical; | |
0ff40013 | 269 | enum btrfs_compression_type compress_type; |
2fe6303e MX |
270 | int this_mirror; |
271 | int failed_mirror; | |
2fe6303e MX |
272 | }; |
273 | ||
150e4b05 QW |
274 | int btrfs_repair_one_sector(struct inode *inode, |
275 | struct bio *failed_bio, u32 bio_offset, | |
276 | struct page *page, unsigned int pgoff, | |
277 | u64 start, int failed_mirror, | |
278 | submit_bio_hook_t *submit_bio_hook); | |
77d5d689 | 279 | |
294e30fe | 280 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
9978059b | 281 | bool find_lock_delalloc_range(struct inode *inode, |
ce9f967f JT |
282 | struct page *locked_page, u64 *start, |
283 | u64 *end); | |
0d4cf4e6 | 284 | #endif |
faa2dbf0 | 285 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 286 | u64 start); |
3fd63727 JB |
287 | |
288 | #ifdef CONFIG_BTRFS_DEBUG | |
289 | void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info); | |
290 | #else | |
291 | #define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0) | |
292 | #endif | |
293 | ||
294e30fe | 294 | #endif |