1 #ifndef __EXTENTIO__ 2 #define __EXTENTIO__ 3 4 #include <linux/rbtree.h> 5 6 /* bits for the extent state */ 7 #define EXTENT_DIRTY (1U << 0) 8 #define EXTENT_WRITEBACK (1U << 1) 9 #define EXTENT_UPTODATE (1U << 2) 10 #define EXTENT_LOCKED (1U << 3) 11 #define EXTENT_NEW (1U << 4) 12 #define EXTENT_DELALLOC (1U << 5) 13 #define EXTENT_DEFRAG (1U << 6) 14 #define EXTENT_BOUNDARY (1U << 9) 15 #define EXTENT_NODATASUM (1U << 10) 16 #define EXTENT_DO_ACCOUNTING (1U << 11) 17 #define EXTENT_FIRST_DELALLOC (1U << 12) 18 #define EXTENT_NEED_WAIT (1U << 13) 19 #define EXTENT_DAMAGED (1U << 14) 20 #define EXTENT_NORESERVE (1U << 15) 21 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 22 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 23 24 /* 25 * flags for bio submission. The high bits indicate the compression 26 * type for this bio 27 */ 28 #define EXTENT_BIO_COMPRESSED 1 29 #define EXTENT_BIO_TREE_LOG 2 30 #define EXTENT_BIO_PARENT_LOCKED 4 31 #define EXTENT_BIO_FLAG_SHIFT 16 32 33 /* these are bit numbers for test/set bit */ 34 #define EXTENT_BUFFER_UPTODATE 0 35 #define EXTENT_BUFFER_DIRTY 2 36 #define EXTENT_BUFFER_CORRUPT 3 37 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ 38 #define EXTENT_BUFFER_TREE_REF 5 39 #define EXTENT_BUFFER_STALE 6 40 #define EXTENT_BUFFER_WRITEBACK 7 41 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */ 42 #define EXTENT_BUFFER_DUMMY 9 43 #define EXTENT_BUFFER_IN_TREE 10 44 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */ 45 46 /* these are flags for extent_clear_unlock_delalloc */ 47 #define PAGE_UNLOCK (1 << 0) 48 #define PAGE_CLEAR_DIRTY (1 << 1) 49 #define PAGE_SET_WRITEBACK (1 << 2) 50 #define PAGE_END_WRITEBACK (1 << 3) 51 #define PAGE_SET_PRIVATE2 (1 << 4) 52 #define PAGE_SET_ERROR (1 << 5) 53 54 /* 55 * page->private values. Every page that is controlled by the extent 56 * map has page->private set to one. 57 */ 58 #define EXTENT_PAGE_PRIVATE 1 59 60 struct extent_state; 61 struct btrfs_root; 62 struct btrfs_io_bio; 63 64 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 65 struct bio *bio, int mirror_num, 66 unsigned long bio_flags, u64 bio_offset); 67 struct extent_io_ops { 68 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 69 u64 start, u64 end, int *page_started, 70 unsigned long *nr_written); 71 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 72 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 73 extent_submit_bio_hook_t *submit_bio_hook; 74 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset, 75 size_t size, struct bio *bio, 76 unsigned long bio_flags); 77 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 78 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 79 struct page *page, u64 start, u64 end, 80 int mirror); 81 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 82 struct extent_state *state, int uptodate); 83 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 84 unsigned *bits); 85 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 86 unsigned *bits); 87 void (*merge_extent_hook)(struct inode *inode, 88 struct extent_state *new, 89 struct extent_state *other); 90 void (*split_extent_hook)(struct inode *inode, 91 struct extent_state *orig, u64 split); 92 }; 93 94 struct extent_io_tree { 95 struct rb_root state; 96 struct address_space *mapping; 97 u64 dirty_bytes; 98 int track_uptodate; 99 spinlock_t lock; 100 struct extent_io_ops *ops; 101 }; 102 103 struct extent_state { 104 u64 start; 105 u64 end; /* inclusive */ 106 struct rb_node rb_node; 107 108 /* ADD NEW ELEMENTS AFTER THIS */ 109 wait_queue_head_t wq; 110 atomic_t refs; 111 unsigned state; 112 113 /* for use by the FS */ 114 u64 private; 115 116 #ifdef CONFIG_BTRFS_DEBUG 117 struct list_head leak_list; 118 #endif 119 }; 120 121 #define INLINE_EXTENT_BUFFER_PAGES 16 122 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) 123 struct extent_buffer { 124 u64 start; 125 unsigned long len; 126 unsigned long bflags; 127 struct btrfs_fs_info *fs_info; 128 spinlock_t refs_lock; 129 atomic_t refs; 130 atomic_t io_pages; 131 int read_mirror; 132 struct rcu_head rcu_head; 133 pid_t lock_owner; 134 135 /* count of read lock holders on the extent buffer */ 136 atomic_t write_locks; 137 atomic_t read_locks; 138 atomic_t blocking_writers; 139 atomic_t blocking_readers; 140 atomic_t spinning_readers; 141 atomic_t spinning_writers; 142 short lock_nested; 143 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 144 short log_index; 145 146 /* protects write locks */ 147 rwlock_t lock; 148 149 /* readers use lock_wq while they wait for the write 150 * lock holders to unlock 151 */ 152 wait_queue_head_t write_lock_wq; 153 154 /* writers use read_lock_wq while they wait for readers 155 * to unlock 156 */ 157 wait_queue_head_t read_lock_wq; 158 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 159 #ifdef CONFIG_BTRFS_DEBUG 160 struct list_head leak_list; 161 #endif 162 }; 163 164 static inline void extent_set_compress_type(unsigned long *bio_flags, 165 int compress_type) 166 { 167 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 168 } 169 170 static inline int extent_compress_type(unsigned long bio_flags) 171 { 172 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 173 } 174 175 struct extent_map_tree; 176 177 typedef struct extent_map *(get_extent_t)(struct inode *inode, 178 struct page *page, 179 size_t pg_offset, 180 u64 start, u64 len, 181 int create); 182 183 void extent_io_tree_init(struct extent_io_tree *tree, 184 struct address_space *mapping); 185 int try_release_extent_mapping(struct extent_map_tree *map, 186 struct extent_io_tree *tree, struct page *page, 187 gfp_t mask); 188 int try_release_extent_buffer(struct page *page); 189 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 190 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 191 unsigned bits, struct extent_state **cached); 192 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 193 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 194 struct extent_state **cached, gfp_t mask); 195 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 196 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 197 get_extent_t *get_extent, int mirror_num); 198 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, 199 get_extent_t *get_extent, int mirror_num); 200 int __init extent_io_init(void); 201 void extent_io_exit(void); 202 203 u64 count_range_bits(struct extent_io_tree *tree, 204 u64 *start, u64 search_end, 205 u64 max_bytes, unsigned bits, int contig); 206 207 void free_extent_state(struct extent_state *state); 208 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 209 unsigned bits, int filled, 210 struct extent_state *cached_state); 211 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 212 unsigned bits, gfp_t mask); 213 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 214 unsigned bits, int wake, int delete, 215 struct extent_state **cached, gfp_t mask); 216 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 217 unsigned bits, gfp_t mask); 218 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 219 unsigned bits, u64 *failed_start, 220 struct extent_state **cached_state, gfp_t mask); 221 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 222 struct extent_state **cached_state, gfp_t mask); 223 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 224 struct extent_state **cached_state, gfp_t mask); 225 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 226 gfp_t mask); 227 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 228 gfp_t mask); 229 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 230 gfp_t mask); 231 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 232 unsigned bits, unsigned clear_bits, 233 struct extent_state **cached_state, gfp_t mask); 234 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 235 struct extent_state **cached_state, gfp_t mask); 236 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 237 struct extent_state **cached_state, gfp_t mask); 238 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 239 u64 *start_ret, u64 *end_ret, unsigned bits, 240 struct extent_state **cached_state); 241 int extent_invalidatepage(struct extent_io_tree *tree, 242 struct page *page, unsigned long offset); 243 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 244 get_extent_t *get_extent, 245 struct writeback_control *wbc); 246 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 247 u64 start, u64 end, get_extent_t *get_extent, 248 int mode); 249 int extent_writepages(struct extent_io_tree *tree, 250 struct address_space *mapping, 251 get_extent_t *get_extent, 252 struct writeback_control *wbc); 253 int btree_write_cache_pages(struct address_space *mapping, 254 struct writeback_control *wbc); 255 int extent_readpages(struct extent_io_tree *tree, 256 struct address_space *mapping, 257 struct list_head *pages, unsigned nr_pages, 258 get_extent_t get_extent); 259 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 260 __u64 start, __u64 len, get_extent_t *get_extent); 261 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 262 void set_page_extent_mapped(struct page *page); 263 264 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 265 u64 start); 266 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 267 u64 start); 268 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 269 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 270 u64 start); 271 void free_extent_buffer(struct extent_buffer *eb); 272 void free_extent_buffer_stale(struct extent_buffer *eb); 273 #define WAIT_NONE 0 274 #define WAIT_COMPLETE 1 275 #define WAIT_PAGE_LOCK 2 276 int read_extent_buffer_pages(struct extent_io_tree *tree, 277 struct extent_buffer *eb, u64 start, int wait, 278 get_extent_t *get_extent, int mirror_num); 279 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 280 281 static inline unsigned long num_extent_pages(u64 start, u64 len) 282 { 283 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 284 (start >> PAGE_CACHE_SHIFT); 285 } 286 287 static inline void extent_buffer_get(struct extent_buffer *eb) 288 { 289 atomic_inc(&eb->refs); 290 } 291 292 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 293 unsigned long start, 294 unsigned long len); 295 void read_extent_buffer(struct extent_buffer *eb, void *dst, 296 unsigned long start, 297 unsigned long len); 298 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst, 299 unsigned long start, 300 unsigned long len); 301 void write_extent_buffer(struct extent_buffer *eb, const void *src, 302 unsigned long start, unsigned long len); 303 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 304 unsigned long dst_offset, unsigned long src_offset, 305 unsigned long len); 306 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 307 unsigned long src_offset, unsigned long len); 308 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 309 unsigned long src_offset, unsigned long len); 310 void memset_extent_buffer(struct extent_buffer *eb, char c, 311 unsigned long start, unsigned long len); 312 void clear_extent_buffer_dirty(struct extent_buffer *eb); 313 int set_extent_buffer_dirty(struct extent_buffer *eb); 314 int set_extent_buffer_uptodate(struct extent_buffer *eb); 315 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 316 int extent_buffer_uptodate(struct extent_buffer *eb); 317 int extent_buffer_under_io(struct extent_buffer *eb); 318 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 319 unsigned long min_len, char **map, 320 unsigned long *map_start, 321 unsigned long *map_len); 322 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 323 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 324 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 325 struct page *locked_page, 326 unsigned bits_to_clear, 327 unsigned long page_ops); 328 struct bio * 329 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 330 gfp_t gfp_flags); 331 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 332 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 333 334 struct btrfs_fs_info; 335 336 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, 337 struct page *page, unsigned int pg_offset, 338 int mirror_num); 339 int clean_io_failure(struct inode *inode, u64 start, struct page *page, 340 unsigned int pg_offset); 341 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 342 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 343 int mirror_num); 344 345 /* 346 * When IO fails, either with EIO or csum verification fails, we 347 * try other mirrors that might have a good copy of the data. This 348 * io_failure_record is used to record state as we go through all the 349 * mirrors. If another mirror has good data, the page is set up to date 350 * and things continue. If a good mirror can't be found, the original 351 * bio end_io callback is called to indicate things have failed. 352 */ 353 struct io_failure_record { 354 struct page *page; 355 u64 start; 356 u64 len; 357 u64 logical; 358 unsigned long bio_flags; 359 int this_mirror; 360 int failed_mirror; 361 int in_validation; 362 }; 363 364 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end); 365 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 366 struct io_failure_record **failrec_ret); 367 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 368 struct io_failure_record *failrec, int fail_mirror); 369 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 370 struct io_failure_record *failrec, 371 struct page *page, int pg_offset, int icsum, 372 bio_end_io_t *endio_func, void *data); 373 int free_io_failure(struct inode *inode, struct io_failure_record *rec); 374 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 375 noinline u64 find_lock_delalloc_range(struct inode *inode, 376 struct extent_io_tree *tree, 377 struct page *locked_page, u64 *start, 378 u64 *end, u64 max_bytes); 379 #endif 380 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 381 u64 start); 382 #endif 383