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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> |
ac467772 | 10 | #include "ulist.h" |
d1310b2e | 11 | |
261507a0 LZ |
12 | /* |
13 | * flags for bio submission. The high bits indicate the compression | |
14 | * type for this bio | |
15 | */ | |
c8b97818 | 16 | #define EXTENT_BIO_COMPRESSED 1 |
261507a0 | 17 | #define EXTENT_BIO_FLAG_SHIFT 16 |
c8b97818 | 18 | |
80cb3836 DS |
19 | enum { |
20 | EXTENT_BUFFER_UPTODATE, | |
21 | EXTENT_BUFFER_DIRTY, | |
22 | EXTENT_BUFFER_CORRUPT, | |
23 | /* this got triggered by readahead */ | |
24 | EXTENT_BUFFER_READAHEAD, | |
25 | EXTENT_BUFFER_TREE_REF, | |
26 | EXTENT_BUFFER_STALE, | |
27 | EXTENT_BUFFER_WRITEBACK, | |
28 | /* read IO error */ | |
29 | EXTENT_BUFFER_READ_ERR, | |
30 | EXTENT_BUFFER_UNMAPPED, | |
31 | EXTENT_BUFFER_IN_TREE, | |
32 | /* write IO error */ | |
33 | EXTENT_BUFFER_WRITE_ERR, | |
d3575156 | 34 | EXTENT_BUFFER_NO_CHECK, |
80cb3836 | 35 | }; |
b4ce94de | 36 | |
da2c7009 | 37 | /* these are flags for __process_pages_contig */ |
c2790a2e | 38 | #define PAGE_UNLOCK (1 << 0) |
6869b0a8 QW |
39 | /* Page starts writeback, clear dirty bit and set writeback bit */ |
40 | #define PAGE_START_WRITEBACK (1 << 1) | |
41 | #define PAGE_END_WRITEBACK (1 << 2) | |
f57ad937 | 42 | #define PAGE_SET_ORDERED (1 << 3) |
6869b0a8 QW |
43 | #define PAGE_SET_ERROR (1 << 4) |
44 | #define PAGE_LOCK (1 << 5) | |
a791e35e | 45 | |
d1310b2e CM |
46 | /* |
47 | * page->private values. Every page that is controlled by the extent | |
48 | * map has page->private set to one. | |
49 | */ | |
50 | #define EXTENT_PAGE_PRIVATE 1 | |
d1310b2e | 51 | |
2fe1d551 OS |
52 | /* |
53 | * The extent buffer bitmap operations are done with byte granularity instead of | |
54 | * word granularity for two reasons: | |
55 | * 1. The bitmaps must be little-endian on disk. | |
56 | * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a | |
57 | * single word in a bitmap may straddle two pages in the extent buffer. | |
58 | */ | |
59 | #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) | |
60 | #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) | |
61 | #define BITMAP_FIRST_BYTE_MASK(start) \ | |
62 | ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) | |
63 | #define BITMAP_LAST_BYTE_MASK(nbits) \ | |
64 | (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) | |
65 | ||
ea466794 | 66 | struct btrfs_root; |
6fc0ef68 | 67 | struct btrfs_inode; |
facc8a22 | 68 | struct btrfs_io_bio; |
183ebab7 | 69 | struct btrfs_fs_info; |
47dc196a | 70 | struct io_failure_record; |
9c7d3a54 | 71 | struct extent_io_tree; |
a758781d | 72 | |
77d5d689 OS |
73 | typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio, |
74 | int mirror_num, | |
75 | unsigned long bio_flags); | |
76 | ||
8896a08d | 77 | typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode, |
1941b64b | 78 | struct bio *bio, u64 dio_file_offset); |
a758781d | 79 | |
deb67895 | 80 | #define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE) |
d1310b2e CM |
81 | struct extent_buffer { |
82 | u64 start; | |
83 | unsigned long len; | |
b4ce94de | 84 | unsigned long bflags; |
f28491e0 | 85 | struct btrfs_fs_info *fs_info; |
3083ee2e | 86 | spinlock_t refs_lock; |
727011e0 | 87 | atomic_t refs; |
0b32f4bb | 88 | atomic_t io_pages; |
5cf1ab56 | 89 | int read_mirror; |
19fe0a8b | 90 | struct rcu_head rcu_head; |
5b25f70f | 91 | pid_t lock_owner; |
656f30db | 92 | /* >= 0 if eb belongs to a log tree, -1 otherwise */ |
dc516164 DS |
93 | s8 log_index; |
94 | ||
95 | struct rw_semaphore lock; | |
bd681513 | 96 | |
b8dae313 | 97 | struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; |
d3575156 | 98 | struct list_head release_list; |
6d49ba1b ES |
99 | #ifdef CONFIG_BTRFS_DEBUG |
100 | struct list_head leak_list; | |
101 | #endif | |
d1310b2e CM |
102 | }; |
103 | ||
390ed29b QW |
104 | /* |
105 | * Structure to record info about the bio being assembled, and other info like | |
106 | * how many bytes are there before stripe/ordered extent boundary. | |
107 | */ | |
108 | struct btrfs_bio_ctrl { | |
109 | struct bio *bio; | |
110 | unsigned long bio_flags; | |
111 | u32 len_to_stripe_boundary; | |
112 | u32 len_to_oe_boundary; | |
113 | }; | |
114 | ||
ac467772 QW |
115 | /* |
116 | * Structure to record how many bytes and which ranges are set/cleared | |
117 | */ | |
118 | struct extent_changeset { | |
119 | /* How many bytes are set/cleared in this operation */ | |
7bc329c1 | 120 | unsigned int bytes_changed; |
ac467772 QW |
121 | |
122 | /* Changed ranges */ | |
53d32359 | 123 | struct ulist range_changed; |
ac467772 QW |
124 | }; |
125 | ||
364ecf36 QW |
126 | static inline void extent_changeset_init(struct extent_changeset *changeset) |
127 | { | |
128 | changeset->bytes_changed = 0; | |
129 | ulist_init(&changeset->range_changed); | |
130 | } | |
131 | ||
132 | static inline struct extent_changeset *extent_changeset_alloc(void) | |
133 | { | |
134 | struct extent_changeset *ret; | |
135 | ||
136 | ret = kmalloc(sizeof(*ret), GFP_KERNEL); | |
137 | if (!ret) | |
138 | return NULL; | |
139 | ||
140 | extent_changeset_init(ret); | |
141 | return ret; | |
142 | } | |
143 | ||
144 | static inline void extent_changeset_release(struct extent_changeset *changeset) | |
145 | { | |
146 | if (!changeset) | |
147 | return; | |
148 | changeset->bytes_changed = 0; | |
149 | ulist_release(&changeset->range_changed); | |
150 | } | |
151 | ||
152 | static inline void extent_changeset_free(struct extent_changeset *changeset) | |
153 | { | |
154 | if (!changeset) | |
155 | return; | |
156 | extent_changeset_release(changeset); | |
157 | kfree(changeset); | |
158 | } | |
159 | ||
261507a0 LZ |
160 | static inline void extent_set_compress_type(unsigned long *bio_flags, |
161 | int compress_type) | |
162 | { | |
163 | *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; | |
164 | } | |
165 | ||
166 | static inline int extent_compress_type(unsigned long bio_flags) | |
167 | { | |
168 | return bio_flags >> EXTENT_BIO_FLAG_SHIFT; | |
169 | } | |
170 | ||
d1310b2e CM |
171 | struct extent_map_tree; |
172 | ||
fc4f21b1 | 173 | typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, |
39b07b5d OS |
174 | struct page *page, size_t pg_offset, |
175 | u64 start, u64 len); | |
d1310b2e | 176 | |
477a30ba | 177 | int try_release_extent_mapping(struct page *page, gfp_t mask); |
f7a52a40 | 178 | int try_release_extent_buffer(struct page *page); |
cd716d8f | 179 | |
c1be9c1a NB |
180 | int __must_check submit_one_bio(struct bio *bio, int mirror_num, |
181 | unsigned long bio_flags); | |
0f208812 | 182 | int btrfs_do_readpage(struct page *page, struct extent_map **em_cached, |
390ed29b | 183 | struct btrfs_bio_ctrl *bio_ctrl, |
0f208812 | 184 | unsigned int read_flags, u64 *prev_em_start); |
0a9b0e53 | 185 | int extent_write_full_page(struct page *page, struct writeback_control *wbc); |
5e3ee236 | 186 | int extent_write_locked_range(struct inode *inode, u64 start, u64 end, |
771ed689 | 187 | int mode); |
8ae225a8 | 188 | int extent_writepages(struct address_space *mapping, |
d1310b2e | 189 | struct writeback_control *wbc); |
0b32f4bb JB |
190 | int btree_write_cache_pages(struct address_space *mapping, |
191 | struct writeback_control *wbc); | |
ba206a02 | 192 | void extent_readahead(struct readahead_control *rac); |
facee0a0 | 193 | int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo, |
bab16e21 | 194 | u64 start, u64 len); |
32443de3 QW |
195 | int set_page_extent_mapped(struct page *page); |
196 | void clear_page_extent_mapped(struct page *page); | |
d1310b2e | 197 | |
f28491e0 | 198 | struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
3fbaf258 | 199 | u64 start, u64 owner_root, int level); |
0f331229 OS |
200 | struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
201 | u64 start, unsigned long len); | |
3f556f78 | 202 | struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 203 | u64 start); |
2b48966a | 204 | struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src); |
f28491e0 | 205 | struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
452c75c3 | 206 | u64 start); |
d1310b2e | 207 | void free_extent_buffer(struct extent_buffer *eb); |
3083ee2e | 208 | void free_extent_buffer_stale(struct extent_buffer *eb); |
bb82ab88 AJ |
209 | #define WAIT_NONE 0 |
210 | #define WAIT_COMPLETE 1 | |
211 | #define WAIT_PAGE_LOCK 2 | |
c2ccfbc6 | 212 | int read_extent_buffer_pages(struct extent_buffer *eb, int wait, |
6af49dbd | 213 | int mirror_num); |
fd8b2b61 | 214 | void wait_on_extent_buffer_writeback(struct extent_buffer *eb); |
bfb484d9 | 215 | void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info, |
3fbaf258 | 216 | u64 bytenr, u64 owner_root, u64 gen, int level); |
bfb484d9 | 217 | void btrfs_readahead_node_child(struct extent_buffer *node, int slot); |
479ed9ab | 218 | |
cc5e31a4 | 219 | static inline int num_extent_pages(const struct extent_buffer *eb) |
479ed9ab | 220 | { |
4a3dc938 QW |
221 | /* |
222 | * For sectorsize == PAGE_SIZE case, since nodesize is always aligned to | |
223 | * sectorsize, it's just eb->len >> PAGE_SHIFT. | |
224 | * | |
225 | * For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE, | |
226 | * thus have to ensure we get at least one page. | |
227 | */ | |
228 | return (eb->len >> PAGE_SHIFT) ?: 1; | |
479ed9ab RD |
229 | } |
230 | ||
2b48966a | 231 | static inline int extent_buffer_uptodate(const struct extent_buffer *eb) |
ba020491 AJ |
232 | { |
233 | return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); | |
234 | } | |
235 | ||
1cbb1f45 JM |
236 | int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
237 | unsigned long start, unsigned long len); | |
238 | void read_extent_buffer(const struct extent_buffer *eb, void *dst, | |
d1310b2e CM |
239 | unsigned long start, |
240 | unsigned long len); | |
a48b73ec JB |
241 | int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb, |
242 | void __user *dst, unsigned long start, | |
243 | unsigned long len); | |
2b48966a DS |
244 | void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src); |
245 | void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb, | |
f157bf76 | 246 | const void *src); |
2b48966a | 247 | void write_extent_buffer(const struct extent_buffer *eb, const void *src, |
d1310b2e | 248 | unsigned long start, unsigned long len); |
2b48966a DS |
249 | void copy_extent_buffer_full(const struct extent_buffer *dst, |
250 | const struct extent_buffer *src); | |
251 | void copy_extent_buffer(const struct extent_buffer *dst, | |
252 | const struct extent_buffer *src, | |
d1310b2e CM |
253 | unsigned long dst_offset, unsigned long src_offset, |
254 | unsigned long len); | |
2b48966a DS |
255 | void memcpy_extent_buffer(const struct extent_buffer *dst, |
256 | unsigned long dst_offset, unsigned long src_offset, | |
257 | unsigned long len); | |
258 | void memmove_extent_buffer(const struct extent_buffer *dst, | |
259 | unsigned long dst_offset, unsigned long src_offset, | |
b159fa28 | 260 | unsigned long len); |
2b48966a | 261 | void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start, |
b159fa28 | 262 | unsigned long len); |
2b48966a | 263 | int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start, |
3e1e8bb7 | 264 | unsigned long pos); |
2b48966a | 265 | void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start, |
3e1e8bb7 | 266 | unsigned long pos, unsigned long len); |
2b48966a DS |
267 | void extent_buffer_bitmap_clear(const struct extent_buffer *eb, |
268 | unsigned long start, unsigned long pos, | |
269 | unsigned long len); | |
270 | void clear_extent_buffer_dirty(const struct extent_buffer *eb); | |
abb57ef3 | 271 | bool set_extent_buffer_dirty(struct extent_buffer *eb); |
09c25a8c | 272 | void set_extent_buffer_uptodate(struct extent_buffer *eb); |
69ba3927 | 273 | void clear_extent_buffer_uptodate(struct extent_buffer *eb); |
2b48966a | 274 | int extent_buffer_under_io(const struct extent_buffer *eb); |
bd1fa4f0 | 275 | void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); |
f6311572 | 276 | void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); |
ad7ff17b | 277 | void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end, |
74e9194a | 278 | struct page *locked_page, |
f97e27e9 | 279 | u32 bits_to_clear, unsigned long page_ops); |
e749af44 | 280 | struct bio *btrfs_bio_alloc(u64 first_byte); |
c5e4c3d7 | 281 | struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs); |
8b6c1d56 | 282 | struct bio *btrfs_bio_clone(struct bio *bio); |
21dda654 | 283 | struct bio *btrfs_bio_clone_partial(struct bio *orig, u64 offset, u64 size); |
4a54c8c1 | 284 | |
6ec656bc JB |
285 | int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
286 | u64 length, u64 logical, struct page *page, | |
287 | unsigned int pg_offset, int mirror_num); | |
b5227c07 | 288 | void end_extent_writepage(struct page *page, int err, u64 start, u64 end); |
2b48966a | 289 | int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num); |
2fe6303e MX |
290 | |
291 | /* | |
292 | * When IO fails, either with EIO or csum verification fails, we | |
293 | * try other mirrors that might have a good copy of the data. This | |
294 | * io_failure_record is used to record state as we go through all the | |
1245835d | 295 | * mirrors. If another mirror has good data, the sector is set up to date |
2fe6303e MX |
296 | * and things continue. If a good mirror can't be found, the original |
297 | * bio end_io callback is called to indicate things have failed. | |
298 | */ | |
299 | struct io_failure_record { | |
300 | struct page *page; | |
301 | u64 start; | |
302 | u64 len; | |
303 | u64 logical; | |
304 | unsigned long bio_flags; | |
305 | int this_mirror; | |
306 | int failed_mirror; | |
2fe6303e MX |
307 | }; |
308 | ||
150e4b05 QW |
309 | int btrfs_repair_one_sector(struct inode *inode, |
310 | struct bio *failed_bio, u32 bio_offset, | |
311 | struct page *page, unsigned int pgoff, | |
312 | u64 start, int failed_mirror, | |
313 | submit_bio_hook_t *submit_bio_hook); | |
77d5d689 | 314 | |
294e30fe | 315 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
9978059b | 316 | bool find_lock_delalloc_range(struct inode *inode, |
ce9f967f JT |
317 | struct page *locked_page, u64 *start, |
318 | u64 *end); | |
0d4cf4e6 | 319 | #endif |
faa2dbf0 | 320 | struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, |
da17066c | 321 | u64 start); |
3fd63727 JB |
322 | |
323 | #ifdef CONFIG_BTRFS_DEBUG | |
324 | void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info); | |
325 | #else | |
326 | #define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0) | |
327 | #endif | |
328 | ||
294e30fe | 329 | #endif |