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_FLAG_SHIFT 16 33 34 /* these are bit numbers for test/set bit */ 35 #define EXTENT_BUFFER_UPTODATE 0 36 #define EXTENT_BUFFER_DIRTY 2 37 #define EXTENT_BUFFER_CORRUPT 3 38 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ 39 #define EXTENT_BUFFER_TREE_REF 5 40 #define EXTENT_BUFFER_STALE 6 41 #define EXTENT_BUFFER_WRITEBACK 7 42 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */ 43 #define EXTENT_BUFFER_DUMMY 9 44 #define EXTENT_BUFFER_IN_TREE 10 45 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */ 46 47 /* these are flags for extent_clear_unlock_delalloc */ 48 #define PAGE_UNLOCK (1 << 0) 49 #define PAGE_CLEAR_DIRTY (1 << 1) 50 #define PAGE_SET_WRITEBACK (1 << 2) 51 #define PAGE_END_WRITEBACK (1 << 3) 52 #define PAGE_SET_PRIVATE2 (1 << 4) 53 #define PAGE_SET_ERROR (1 << 5) 54 55 /* 56 * page->private values. Every page that is controlled by the extent 57 * map has page->private set to one. 58 */ 59 #define EXTENT_PAGE_PRIVATE 1 60 61 struct extent_state; 62 struct btrfs_root; 63 struct btrfs_io_bio; 64 struct io_failure_record; 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 struct io_failure_record *failrec; 116 117 #ifdef CONFIG_BTRFS_DEBUG 118 struct list_head leak_list; 119 #endif 120 }; 121 122 #define INLINE_EXTENT_BUFFER_PAGES 16 123 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) 124 struct extent_buffer { 125 u64 start; 126 unsigned long len; 127 unsigned long bflags; 128 struct btrfs_fs_info *fs_info; 129 spinlock_t refs_lock; 130 atomic_t refs; 131 atomic_t io_pages; 132 int read_mirror; 133 struct rcu_head rcu_head; 134 pid_t lock_owner; 135 136 /* count of read lock holders on the extent buffer */ 137 atomic_t write_locks; 138 atomic_t read_locks; 139 atomic_t blocking_writers; 140 atomic_t blocking_readers; 141 atomic_t spinning_readers; 142 atomic_t spinning_writers; 143 short lock_nested; 144 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 145 short log_index; 146 147 /* protects write locks */ 148 rwlock_t lock; 149 150 /* readers use lock_wq while they wait for the write 151 * lock holders to unlock 152 */ 153 wait_queue_head_t write_lock_wq; 154 155 /* writers use read_lock_wq while they wait for readers 156 * to unlock 157 */ 158 wait_queue_head_t read_lock_wq; 159 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 160 #ifdef CONFIG_BTRFS_DEBUG 161 struct list_head leak_list; 162 #endif 163 }; 164 165 /* 166 * Structure to record how many bytes and which ranges are set/cleared 167 */ 168 struct extent_changeset { 169 /* How many bytes are set/cleared in this operation */ 170 u64 bytes_changed; 171 172 /* Changed ranges */ 173 struct ulist *range_changed; 174 }; 175 176 static inline void extent_set_compress_type(unsigned long *bio_flags, 177 int compress_type) 178 { 179 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 180 } 181 182 static inline int extent_compress_type(unsigned long bio_flags) 183 { 184 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 185 } 186 187 struct extent_map_tree; 188 189 typedef struct extent_map *(get_extent_t)(struct inode *inode, 190 struct page *page, 191 size_t pg_offset, 192 u64 start, u64 len, 193 int create); 194 195 void extent_io_tree_init(struct extent_io_tree *tree, 196 struct address_space *mapping); 197 int try_release_extent_mapping(struct extent_map_tree *map, 198 struct extent_io_tree *tree, struct page *page, 199 gfp_t mask); 200 int try_release_extent_buffer(struct page *page); 201 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 202 struct extent_state **cached); 203 204 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 205 { 206 return lock_extent_bits(tree, start, end, NULL); 207 } 208 209 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 210 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 211 get_extent_t *get_extent, int mirror_num); 212 int __init extent_io_init(void); 213 void extent_io_exit(void); 214 215 u64 count_range_bits(struct extent_io_tree *tree, 216 u64 *start, u64 search_end, 217 u64 max_bytes, unsigned bits, int contig); 218 219 void free_extent_state(struct extent_state *state); 220 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 221 unsigned bits, int filled, 222 struct extent_state *cached_state); 223 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 224 unsigned bits, gfp_t mask, 225 struct extent_changeset *changeset); 226 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 227 unsigned bits, int wake, int delete, 228 struct extent_state **cached, gfp_t mask); 229 230 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) 231 { 232 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, 233 GFP_NOFS); 234 } 235 236 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, 237 u64 end, struct extent_state **cached, gfp_t mask) 238 { 239 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 240 mask); 241 } 242 243 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, 244 u64 end, unsigned bits, gfp_t mask) 245 { 246 int wake = 0; 247 248 if (bits & EXTENT_LOCKED) 249 wake = 1; 250 251 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, mask); 252 } 253 254 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 255 unsigned bits, gfp_t mask, 256 struct extent_changeset *changeset); 257 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 258 unsigned bits, u64 *failed_start, 259 struct extent_state **cached_state, gfp_t mask); 260 261 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, 262 u64 end, unsigned bits, gfp_t mask) 263 { 264 return set_extent_bit(tree, start, end, bits, NULL, NULL, mask); 265 } 266 267 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, 268 u64 end, struct extent_state **cached_state, gfp_t mask) 269 { 270 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, 271 cached_state, mask); 272 } 273 274 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, 275 u64 end, gfp_t mask) 276 { 277 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, 278 NULL, mask); 279 } 280 281 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, 282 u64 end, gfp_t mask) 283 { 284 return clear_extent_bit(tree, start, end, 285 EXTENT_DIRTY | EXTENT_DELALLOC | 286 EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); 287 } 288 289 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 290 unsigned bits, unsigned clear_bits, 291 struct extent_state **cached_state, gfp_t mask); 292 293 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, 294 u64 end, struct extent_state **cached_state, gfp_t mask) 295 { 296 return set_extent_bit(tree, start, end, 297 EXTENT_DELALLOC | EXTENT_UPTODATE, 298 NULL, cached_state, mask); 299 } 300 301 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, 302 u64 end, struct extent_state **cached_state, gfp_t mask) 303 { 304 return set_extent_bit(tree, start, end, 305 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, 306 NULL, cached_state, mask); 307 } 308 309 static inline int set_extent_new(struct extent_io_tree *tree, u64 start, 310 u64 end, gfp_t mask) 311 { 312 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, mask); 313 } 314 315 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, 316 u64 end, struct extent_state **cached_state, gfp_t mask) 317 { 318 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, 319 cached_state, mask); 320 } 321 322 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 323 u64 *start_ret, u64 *end_ret, unsigned bits, 324 struct extent_state **cached_state); 325 int extent_invalidatepage(struct extent_io_tree *tree, 326 struct page *page, unsigned long offset); 327 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 328 get_extent_t *get_extent, 329 struct writeback_control *wbc); 330 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 331 u64 start, u64 end, get_extent_t *get_extent, 332 int mode); 333 int extent_writepages(struct extent_io_tree *tree, 334 struct address_space *mapping, 335 get_extent_t *get_extent, 336 struct writeback_control *wbc); 337 int btree_write_cache_pages(struct address_space *mapping, 338 struct writeback_control *wbc); 339 int extent_readpages(struct extent_io_tree *tree, 340 struct address_space *mapping, 341 struct list_head *pages, unsigned nr_pages, 342 get_extent_t get_extent); 343 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 344 __u64 start, __u64 len, get_extent_t *get_extent); 345 void set_page_extent_mapped(struct page *page); 346 347 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 348 u64 start); 349 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 350 u64 start, unsigned long len); 351 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 352 u64 start); 353 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 354 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 355 u64 start); 356 void free_extent_buffer(struct extent_buffer *eb); 357 void free_extent_buffer_stale(struct extent_buffer *eb); 358 #define WAIT_NONE 0 359 #define WAIT_COMPLETE 1 360 #define WAIT_PAGE_LOCK 2 361 int read_extent_buffer_pages(struct extent_io_tree *tree, 362 struct extent_buffer *eb, u64 start, int wait, 363 get_extent_t *get_extent, int mirror_num); 364 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 365 366 static inline unsigned long num_extent_pages(u64 start, u64 len) 367 { 368 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 369 (start >> PAGE_SHIFT); 370 } 371 372 static inline void extent_buffer_get(struct extent_buffer *eb) 373 { 374 atomic_inc(&eb->refs); 375 } 376 377 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 378 unsigned long start, 379 unsigned long len); 380 void read_extent_buffer(struct extent_buffer *eb, void *dst, 381 unsigned long start, 382 unsigned long len); 383 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst, 384 unsigned long start, 385 unsigned long len); 386 void write_extent_buffer(struct extent_buffer *eb, const void *src, 387 unsigned long start, unsigned long len); 388 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 389 unsigned long dst_offset, unsigned long src_offset, 390 unsigned long len); 391 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 392 unsigned long src_offset, unsigned long len); 393 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 394 unsigned long src_offset, unsigned long len); 395 void memset_extent_buffer(struct extent_buffer *eb, char c, 396 unsigned long start, unsigned long len); 397 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 398 unsigned long pos); 399 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 400 unsigned long pos, unsigned long len); 401 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, 402 unsigned long pos, unsigned long len); 403 void clear_extent_buffer_dirty(struct extent_buffer *eb); 404 int set_extent_buffer_dirty(struct extent_buffer *eb); 405 void set_extent_buffer_uptodate(struct extent_buffer *eb); 406 void clear_extent_buffer_uptodate(struct extent_buffer *eb); 407 int extent_buffer_uptodate(struct extent_buffer *eb); 408 int extent_buffer_under_io(struct extent_buffer *eb); 409 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 410 unsigned long min_len, char **map, 411 unsigned long *map_start, 412 unsigned long *map_len); 413 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 414 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 415 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 416 struct page *locked_page, 417 unsigned bits_to_clear, 418 unsigned long page_ops); 419 struct bio * 420 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 421 gfp_t gfp_flags); 422 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 423 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 424 425 struct btrfs_fs_info; 426 427 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, 428 struct page *page, unsigned int pg_offset, 429 int mirror_num); 430 int clean_io_failure(struct inode *inode, u64 start, struct page *page, 431 unsigned int pg_offset); 432 void end_extent_writepage(struct page *page, int err, u64 start, u64 end); 433 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 434 int mirror_num); 435 436 /* 437 * When IO fails, either with EIO or csum verification fails, we 438 * try other mirrors that might have a good copy of the data. This 439 * io_failure_record is used to record state as we go through all the 440 * mirrors. If another mirror has good data, the page is set up to date 441 * and things continue. If a good mirror can't be found, the original 442 * bio end_io callback is called to indicate things have failed. 443 */ 444 struct io_failure_record { 445 struct page *page; 446 u64 start; 447 u64 len; 448 u64 logical; 449 unsigned long bio_flags; 450 int this_mirror; 451 int failed_mirror; 452 int in_validation; 453 }; 454 455 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end); 456 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 457 struct io_failure_record **failrec_ret); 458 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 459 struct io_failure_record *failrec, int fail_mirror); 460 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 461 struct io_failure_record *failrec, 462 struct page *page, int pg_offset, int icsum, 463 bio_end_io_t *endio_func, void *data); 464 int free_io_failure(struct inode *inode, struct io_failure_record *rec); 465 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 466 noinline u64 find_lock_delalloc_range(struct inode *inode, 467 struct extent_io_tree *tree, 468 struct page *locked_page, u64 *start, 469 u64 *end, u64 max_bytes); 470 #endif 471 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 472 u64 start); 473 #endif 474