1 #ifndef __EXTENTIO__ 2 #define __EXTENTIO__ 3 4 #include <linux/rbtree.h> 5 #include "ulist.h" 6 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_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 24 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 25 26 /* 27 * flags for bio submission. The high bits indicate the compression 28 * type for this bio 29 */ 30 #define EXTENT_BIO_COMPRESSED 1 31 #define EXTENT_BIO_TREE_LOG 2 32 #define EXTENT_BIO_PARENT_LOCKED 4 33 #define EXTENT_BIO_FLAG_SHIFT 16 34 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 */ 47 48 /* these are flags for extent_clear_unlock_delalloc */ 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 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 61 62 struct extent_state; 63 struct btrfs_root; 64 struct btrfs_io_bio; 65 66 typedef int (extent_submit_bio_hook_t)(struct inode *inode, int rw, 67 struct bio *bio, int mirror_num, 68 unsigned long bio_flags, u64 bio_offset); 69 struct extent_io_ops { 70 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 71 u64 start, u64 end, int *page_started, 72 unsigned long *nr_written); 73 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 74 int (*writepage_io_hook)(struct page *page, u64 start, u64 end); 75 extent_submit_bio_hook_t *submit_bio_hook; 76 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset, 77 size_t size, struct bio *bio, 78 unsigned long bio_flags); 79 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 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); 83 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 84 struct extent_state *state, int uptodate); 85 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 86 unsigned *bits); 87 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 88 unsigned *bits); 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); 94 }; 95 96 struct extent_io_tree { 97 struct rb_root state; 98 struct address_space *mapping; 99 u64 dirty_bytes; 100 int track_uptodate; 101 spinlock_t lock; 102 const struct extent_io_ops *ops; 103 }; 104 105 struct extent_state { 106 u64 start; 107 u64 end; /* inclusive */ 108 struct rb_node rb_node; 109 110 /* ADD NEW ELEMENTS AFTER THIS */ 111 wait_queue_head_t wq; 112 atomic_t refs; 113 unsigned state; 114 115 /* for use by the FS */ 116 u64 private; 117 118 #ifdef CONFIG_BTRFS_DEBUG 119 struct list_head leak_list; 120 #endif 121 }; 122 123 #define INLINE_EXTENT_BUFFER_PAGES 16 124 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE) 125 struct extent_buffer { 126 u64 start; 127 unsigned long len; 128 unsigned long bflags; 129 struct btrfs_fs_info *fs_info; 130 spinlock_t refs_lock; 131 atomic_t refs; 132 atomic_t io_pages; 133 int read_mirror; 134 struct rcu_head rcu_head; 135 pid_t lock_owner; 136 137 /* 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; 144 short lock_nested; 145 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 146 short log_index; 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; 155 156 /* writers use read_lock_wq while they wait for readers 157 * to unlock 158 */ 159 wait_queue_head_t read_lock_wq; 160 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 161 #ifdef CONFIG_BTRFS_DEBUG 162 struct list_head leak_list; 163 #endif 164 }; 165 166 /* 167 * Structure to record how many bytes and which ranges are set/cleared 168 */ 169 struct 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 }; 176 177 static 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 } 182 183 static inline int extent_compress_type(unsigned long bio_flags) 184 { 185 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 186 } 187 188 struct extent_map_tree; 189 190 typedef struct extent_map *(get_extent_t)(struct inode *inode, 191 struct page *page, 192 size_t pg_offset, 193 u64 start, u64 len, 194 int create); 195 196 void extent_io_tree_init(struct extent_io_tree *tree, 197 struct address_space *mapping); 198 int try_release_extent_mapping(struct extent_map_tree *map, 199 struct extent_io_tree *tree, struct page *page, 200 gfp_t mask); 201 int try_release_extent_buffer(struct page *page); 202 int lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 203 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 204 unsigned bits, struct extent_state **cached); 205 int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end); 206 int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, 207 struct extent_state **cached, gfp_t mask); 208 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 209 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 210 get_extent_t *get_extent, int mirror_num); 211 int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, 212 get_extent_t *get_extent, int mirror_num); 213 int __init extent_io_init(void); 214 void extent_io_exit(void); 215 216 u64 count_range_bits(struct extent_io_tree *tree, 217 u64 *start, u64 search_end, 218 u64 max_bytes, unsigned bits, int contig); 219 220 void free_extent_state(struct extent_state *state); 221 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 222 unsigned bits, int filled, 223 struct extent_state *cached_state); 224 int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 225 unsigned bits, gfp_t mask); 226 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 227 unsigned bits, gfp_t mask, 228 struct extent_changeset *changeset); 229 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 230 unsigned bits, int wake, int delete, 231 struct extent_state **cached, gfp_t mask); 232 int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 233 unsigned bits, gfp_t mask); 234 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 235 unsigned bits, gfp_t mask, 236 struct extent_changeset *changeset); 237 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 238 unsigned bits, u64 *failed_start, 239 struct extent_state **cached_state, gfp_t mask); 240 int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 241 struct extent_state **cached_state, gfp_t mask); 242 int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, 243 struct extent_state **cached_state, gfp_t mask); 244 int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, 245 gfp_t mask); 246 int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 247 gfp_t mask); 248 int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, 249 gfp_t mask); 250 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 251 unsigned bits, unsigned clear_bits, 252 struct extent_state **cached_state, gfp_t mask); 253 int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, 254 struct extent_state **cached_state, gfp_t mask); 255 int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, 256 struct extent_state **cached_state, gfp_t mask); 257 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 258 u64 *start_ret, u64 *end_ret, unsigned bits, 259 struct extent_state **cached_state); 260 int extent_invalidatepage(struct extent_io_tree *tree, 261 struct page *page, unsigned long offset); 262 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 263 get_extent_t *get_extent, 264 struct writeback_control *wbc); 265 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 266 u64 start, u64 end, get_extent_t *get_extent, 267 int mode); 268 int extent_writepages(struct extent_io_tree *tree, 269 struct address_space *mapping, 270 get_extent_t *get_extent, 271 struct writeback_control *wbc); 272 int btree_write_cache_pages(struct address_space *mapping, 273 struct writeback_control *wbc); 274 int extent_readpages(struct extent_io_tree *tree, 275 struct address_space *mapping, 276 struct list_head *pages, unsigned nr_pages, 277 get_extent_t get_extent); 278 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 279 __u64 start, __u64 len, get_extent_t *get_extent); 280 int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private); 281 void set_page_extent_mapped(struct page *page); 282 283 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 284 u64 start); 285 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 286 u64 start); 287 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 288 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 289 u64 start); 290 void free_extent_buffer(struct extent_buffer *eb); 291 void free_extent_buffer_stale(struct extent_buffer *eb); 292 #define WAIT_NONE 0 293 #define WAIT_COMPLETE 1 294 #define WAIT_PAGE_LOCK 2 295 int read_extent_buffer_pages(struct extent_io_tree *tree, 296 struct extent_buffer *eb, u64 start, int wait, 297 get_extent_t *get_extent, int mirror_num); 298 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 299 300 static inline unsigned long num_extent_pages(u64 start, u64 len) 301 { 302 return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) - 303 (start >> PAGE_CACHE_SHIFT); 304 } 305 306 static inline void extent_buffer_get(struct extent_buffer *eb) 307 { 308 atomic_inc(&eb->refs); 309 } 310 311 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 312 unsigned long start, 313 unsigned long len); 314 void read_extent_buffer(struct extent_buffer *eb, void *dst, 315 unsigned long start, 316 unsigned long len); 317 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst, 318 unsigned long start, 319 unsigned long len); 320 void write_extent_buffer(struct extent_buffer *eb, const void *src, 321 unsigned long start, unsigned long len); 322 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 323 unsigned long dst_offset, unsigned long src_offset, 324 unsigned long len); 325 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 326 unsigned long src_offset, unsigned long len); 327 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 328 unsigned long src_offset, unsigned long len); 329 void memset_extent_buffer(struct extent_buffer *eb, char c, 330 unsigned long start, unsigned long len); 331 void clear_extent_buffer_dirty(struct extent_buffer *eb); 332 int set_extent_buffer_dirty(struct extent_buffer *eb); 333 int set_extent_buffer_uptodate(struct extent_buffer *eb); 334 int clear_extent_buffer_uptodate(struct extent_buffer *eb); 335 int extent_buffer_uptodate(struct extent_buffer *eb); 336 int extent_buffer_under_io(struct extent_buffer *eb); 337 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 338 unsigned long min_len, char **map, 339 unsigned long *map_start, 340 unsigned long *map_len); 341 int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 342 int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 343 int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 344 struct page *locked_page, 345 unsigned bits_to_clear, 346 unsigned long page_ops); 347 struct bio * 348 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 349 gfp_t gfp_flags); 350 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 351 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 352 353 struct btrfs_fs_info; 354 355 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, 356 struct page *page, unsigned int pg_offset, 357 int mirror_num); 358 int clean_io_failure(struct inode *inode, u64 start, struct page *page, 359 unsigned int pg_offset); 360 int end_extent_writepage(struct page *page, int err, u64 start, u64 end); 361 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 362 int mirror_num); 363 364 /* 365 * When IO fails, either with EIO or csum verification fails, we 366 * try other mirrors that might have a good copy of the data. This 367 * io_failure_record is used to record state as we go through all the 368 * mirrors. If another mirror has good data, the page is set up to date 369 * and things continue. If a good mirror can't be found, the original 370 * bio end_io callback is called to indicate things have failed. 371 */ 372 struct io_failure_record { 373 struct page *page; 374 u64 start; 375 u64 len; 376 u64 logical; 377 unsigned long bio_flags; 378 int this_mirror; 379 int failed_mirror; 380 int in_validation; 381 }; 382 383 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end); 384 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 385 struct io_failure_record **failrec_ret); 386 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 387 struct io_failure_record *failrec, int fail_mirror); 388 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 389 struct io_failure_record *failrec, 390 struct page *page, int pg_offset, int icsum, 391 bio_end_io_t *endio_func, void *data); 392 int free_io_failure(struct inode *inode, struct io_failure_record *rec); 393 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 394 noinline u64 find_lock_delalloc_range(struct inode *inode, 395 struct extent_io_tree *tree, 396 struct page *locked_page, u64 *start, 397 u64 *end, u64 max_bytes); 398 #endif 399 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 400 u64 start); 401 #endif 402