1 #ifndef __EXTENTIO__ 2 #define __EXTENTIO__ 3 4 #include <linux/rbtree.h> 5 #include <linux/refcount.h> 6 #include "ulist.h" 7 8 /* bits for the extent state */ 9 #define EXTENT_DIRTY (1U << 0) 10 #define EXTENT_WRITEBACK (1U << 1) 11 #define EXTENT_UPTODATE (1U << 2) 12 #define EXTENT_LOCKED (1U << 3) 13 #define EXTENT_NEW (1U << 4) 14 #define EXTENT_DELALLOC (1U << 5) 15 #define EXTENT_DEFRAG (1U << 6) 16 #define EXTENT_BOUNDARY (1U << 9) 17 #define EXTENT_NODATASUM (1U << 10) 18 #define EXTENT_CLEAR_META_RESV (1U << 11) 19 #define EXTENT_FIRST_DELALLOC (1U << 12) 20 #define EXTENT_NEED_WAIT (1U << 13) 21 #define EXTENT_DAMAGED (1U << 14) 22 #define EXTENT_NORESERVE (1U << 15) 23 #define EXTENT_QGROUP_RESERVED (1U << 16) 24 #define EXTENT_CLEAR_DATA_RESV (1U << 17) 25 #define EXTENT_DELALLOC_NEW (1U << 18) 26 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 27 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \ 28 EXTENT_CLEAR_DATA_RESV) 29 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 30 31 /* 32 * flags for bio submission. The high bits indicate the compression 33 * type for this bio 34 */ 35 #define EXTENT_BIO_COMPRESSED 1 36 #define EXTENT_BIO_TREE_LOG 2 37 #define EXTENT_BIO_FLAG_SHIFT 16 38 39 /* these are bit numbers for test/set bit */ 40 #define EXTENT_BUFFER_UPTODATE 0 41 #define EXTENT_BUFFER_DIRTY 2 42 #define EXTENT_BUFFER_CORRUPT 3 43 #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ 44 #define EXTENT_BUFFER_TREE_REF 5 45 #define EXTENT_BUFFER_STALE 6 46 #define EXTENT_BUFFER_WRITEBACK 7 47 #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */ 48 #define EXTENT_BUFFER_DUMMY 9 49 #define EXTENT_BUFFER_IN_TREE 10 50 #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */ 51 52 /* these are flags for __process_pages_contig */ 53 #define PAGE_UNLOCK (1 << 0) 54 #define PAGE_CLEAR_DIRTY (1 << 1) 55 #define PAGE_SET_WRITEBACK (1 << 2) 56 #define PAGE_END_WRITEBACK (1 << 3) 57 #define PAGE_SET_PRIVATE2 (1 << 4) 58 #define PAGE_SET_ERROR (1 << 5) 59 #define PAGE_LOCK (1 << 6) 60 61 /* 62 * page->private values. Every page that is controlled by the extent 63 * map has page->private set to one. 64 */ 65 #define EXTENT_PAGE_PRIVATE 1 66 67 /* 68 * The extent buffer bitmap operations are done with byte granularity instead of 69 * word granularity for two reasons: 70 * 1. The bitmaps must be little-endian on disk. 71 * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a 72 * single word in a bitmap may straddle two pages in the extent buffer. 73 */ 74 #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) 75 #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) 76 #define BITMAP_FIRST_BYTE_MASK(start) \ 77 ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) 78 #define BITMAP_LAST_BYTE_MASK(nbits) \ 79 (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) 80 81 static inline int le_test_bit(int nr, const u8 *addr) 82 { 83 return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1))); 84 } 85 86 extern void le_bitmap_set(u8 *map, unsigned int start, int len); 87 extern void le_bitmap_clear(u8 *map, unsigned int start, int len); 88 89 struct extent_state; 90 struct btrfs_root; 91 struct btrfs_inode; 92 struct btrfs_io_bio; 93 struct io_failure_record; 94 95 typedef int (extent_submit_bio_hook_t)(struct inode *inode, struct bio *bio, 96 int mirror_num, unsigned long bio_flags, 97 u64 bio_offset); 98 struct extent_io_ops { 99 /* 100 * The following callbacks must be allways defined, the function 101 * pointer will be called unconditionally. 102 */ 103 extent_submit_bio_hook_t *submit_bio_hook; 104 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 105 struct page *page, u64 start, u64 end, 106 int mirror); 107 int (*merge_bio_hook)(struct page *page, unsigned long offset, 108 size_t size, struct bio *bio, 109 unsigned long bio_flags); 110 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 111 112 /* 113 * Optional hooks, called if the pointer is not NULL 114 */ 115 int (*fill_delalloc)(struct inode *inode, struct page *locked_page, 116 u64 start, u64 end, int *page_started, 117 unsigned long *nr_written); 118 119 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 120 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 121 struct extent_state *state, int uptodate); 122 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 123 unsigned *bits); 124 void (*clear_bit_hook)(struct btrfs_inode *inode, 125 struct extent_state *state, 126 unsigned *bits); 127 void (*merge_extent_hook)(struct inode *inode, 128 struct extent_state *new, 129 struct extent_state *other); 130 void (*split_extent_hook)(struct inode *inode, 131 struct extent_state *orig, u64 split); 132 }; 133 134 struct extent_io_tree { 135 struct rb_root state; 136 struct address_space *mapping; 137 u64 dirty_bytes; 138 int track_uptodate; 139 spinlock_t lock; 140 const struct extent_io_ops *ops; 141 }; 142 143 struct extent_state { 144 u64 start; 145 u64 end; /* inclusive */ 146 struct rb_node rb_node; 147 148 /* ADD NEW ELEMENTS AFTER THIS */ 149 wait_queue_head_t wq; 150 refcount_t refs; 151 unsigned state; 152 153 struct io_failure_record *failrec; 154 155 #ifdef CONFIG_BTRFS_DEBUG 156 struct list_head leak_list; 157 #endif 158 }; 159 160 #define INLINE_EXTENT_BUFFER_PAGES 16 161 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) 162 struct extent_buffer { 163 u64 start; 164 unsigned long len; 165 unsigned long bflags; 166 struct btrfs_fs_info *fs_info; 167 spinlock_t refs_lock; 168 atomic_t refs; 169 atomic_t io_pages; 170 int read_mirror; 171 struct rcu_head rcu_head; 172 pid_t lock_owner; 173 174 /* count of read lock holders on the extent buffer */ 175 atomic_t write_locks; 176 atomic_t read_locks; 177 atomic_t blocking_writers; 178 atomic_t blocking_readers; 179 atomic_t spinning_readers; 180 atomic_t spinning_writers; 181 short lock_nested; 182 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 183 short log_index; 184 185 /* protects write locks */ 186 rwlock_t lock; 187 188 /* readers use lock_wq while they wait for the write 189 * lock holders to unlock 190 */ 191 wait_queue_head_t write_lock_wq; 192 193 /* writers use read_lock_wq while they wait for readers 194 * to unlock 195 */ 196 wait_queue_head_t read_lock_wq; 197 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 198 #ifdef CONFIG_BTRFS_DEBUG 199 struct list_head leak_list; 200 #endif 201 }; 202 203 /* 204 * Structure to record how many bytes and which ranges are set/cleared 205 */ 206 struct extent_changeset { 207 /* How many bytes are set/cleared in this operation */ 208 u64 bytes_changed; 209 210 /* Changed ranges */ 211 struct ulist range_changed; 212 }; 213 214 static inline void extent_set_compress_type(unsigned long *bio_flags, 215 int compress_type) 216 { 217 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 218 } 219 220 static inline int extent_compress_type(unsigned long bio_flags) 221 { 222 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 223 } 224 225 struct extent_map_tree; 226 227 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, 228 struct page *page, 229 size_t pg_offset, 230 u64 start, u64 len, 231 int create); 232 233 void extent_io_tree_init(struct extent_io_tree *tree, 234 struct address_space *mapping); 235 int try_release_extent_mapping(struct extent_map_tree *map, 236 struct extent_io_tree *tree, struct page *page, 237 gfp_t mask); 238 int try_release_extent_buffer(struct page *page); 239 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 240 struct extent_state **cached); 241 242 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 243 { 244 return lock_extent_bits(tree, start, end, NULL); 245 } 246 247 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 248 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 249 get_extent_t *get_extent, int mirror_num); 250 int __init extent_io_init(void); 251 void extent_io_exit(void); 252 253 u64 count_range_bits(struct extent_io_tree *tree, 254 u64 *start, u64 search_end, 255 u64 max_bytes, unsigned bits, int contig); 256 257 void free_extent_state(struct extent_state *state); 258 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 259 unsigned bits, int filled, 260 struct extent_state *cached_state); 261 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 262 unsigned bits, struct extent_changeset *changeset); 263 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 264 unsigned bits, int wake, int delete, 265 struct extent_state **cached, gfp_t mask); 266 267 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) 268 { 269 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, 270 GFP_NOFS); 271 } 272 273 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, 274 u64 end, struct extent_state **cached, gfp_t mask) 275 { 276 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 277 mask); 278 } 279 280 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, 281 u64 end, unsigned bits) 282 { 283 int wake = 0; 284 285 if (bits & EXTENT_LOCKED) 286 wake = 1; 287 288 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, 289 GFP_NOFS); 290 } 291 292 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 293 unsigned bits, struct extent_changeset *changeset); 294 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 295 unsigned bits, u64 *failed_start, 296 struct extent_state **cached_state, gfp_t mask); 297 298 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, 299 u64 end, unsigned bits) 300 { 301 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); 302 } 303 304 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, 305 u64 end, struct extent_state **cached_state, gfp_t mask) 306 { 307 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, 308 cached_state, mask); 309 } 310 311 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, 312 u64 end, gfp_t mask) 313 { 314 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, 315 NULL, mask); 316 } 317 318 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, 319 u64 end) 320 { 321 return clear_extent_bit(tree, start, end, 322 EXTENT_DIRTY | EXTENT_DELALLOC | 323 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); 324 } 325 326 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 327 unsigned bits, unsigned clear_bits, 328 struct extent_state **cached_state); 329 330 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, 331 u64 end, struct extent_state **cached_state) 332 { 333 return set_extent_bit(tree, start, end, 334 EXTENT_DELALLOC | EXTENT_UPTODATE, 335 NULL, cached_state, GFP_NOFS); 336 } 337 338 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, 339 u64 end, struct extent_state **cached_state) 340 { 341 return set_extent_bit(tree, start, end, 342 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, 343 NULL, cached_state, GFP_NOFS); 344 } 345 346 static inline int set_extent_new(struct extent_io_tree *tree, u64 start, 347 u64 end) 348 { 349 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, 350 GFP_NOFS); 351 } 352 353 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, 354 u64 end, struct extent_state **cached_state, gfp_t mask) 355 { 356 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, 357 cached_state, mask); 358 } 359 360 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 361 u64 *start_ret, u64 *end_ret, unsigned bits, 362 struct extent_state **cached_state); 363 int extent_invalidatepage(struct extent_io_tree *tree, 364 struct page *page, unsigned long offset); 365 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 366 get_extent_t *get_extent, 367 struct writeback_control *wbc); 368 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 369 u64 start, u64 end, get_extent_t *get_extent, 370 int mode); 371 int extent_writepages(struct extent_io_tree *tree, 372 struct address_space *mapping, 373 get_extent_t *get_extent, 374 struct writeback_control *wbc); 375 int btree_write_cache_pages(struct address_space *mapping, 376 struct writeback_control *wbc); 377 int extent_readpages(struct extent_io_tree *tree, 378 struct address_space *mapping, 379 struct list_head *pages, unsigned nr_pages, 380 get_extent_t get_extent); 381 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 382 __u64 start, __u64 len, get_extent_t *get_extent); 383 void set_page_extent_mapped(struct page *page); 384 385 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 386 u64 start); 387 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 388 u64 start, unsigned long len); 389 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 390 u64 start); 391 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 392 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 393 u64 start); 394 void free_extent_buffer(struct extent_buffer *eb); 395 void free_extent_buffer_stale(struct extent_buffer *eb); 396 #define WAIT_NONE 0 397 #define WAIT_COMPLETE 1 398 #define WAIT_PAGE_LOCK 2 399 int read_extent_buffer_pages(struct extent_io_tree *tree, 400 struct extent_buffer *eb, int wait, 401 get_extent_t *get_extent, int mirror_num); 402 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 403 404 static inline unsigned long num_extent_pages(u64 start, u64 len) 405 { 406 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 407 (start >> PAGE_SHIFT); 408 } 409 410 static inline void extent_buffer_get(struct extent_buffer *eb) 411 { 412 atomic_inc(&eb->refs); 413 } 414 415 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 416 unsigned long start, 417 unsigned long len); 418 void read_extent_buffer(struct extent_buffer *eb, void *dst, 419 unsigned long start, 420 unsigned long len); 421 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst, 422 unsigned long start, 423 unsigned long len); 424 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src); 425 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, 426 const void *src); 427 void write_extent_buffer(struct extent_buffer *eb, const void *src, 428 unsigned long start, unsigned long len); 429 void copy_extent_buffer_full(struct extent_buffer *dst, 430 struct extent_buffer *src); 431 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 432 unsigned long dst_offset, unsigned long src_offset, 433 unsigned long len); 434 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 435 unsigned long src_offset, unsigned long len); 436 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 437 unsigned long src_offset, unsigned long len); 438 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, 439 unsigned long len); 440 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 441 unsigned long pos); 442 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 443 unsigned long pos, unsigned long len); 444 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, 445 unsigned long pos, unsigned long len); 446 void clear_extent_buffer_dirty(struct extent_buffer *eb); 447 int set_extent_buffer_dirty(struct extent_buffer *eb); 448 void set_extent_buffer_uptodate(struct extent_buffer *eb); 449 void clear_extent_buffer_uptodate(struct extent_buffer *eb); 450 int extent_buffer_uptodate(struct extent_buffer *eb); 451 int extent_buffer_under_io(struct extent_buffer *eb); 452 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 453 unsigned long min_len, char **map, 454 unsigned long *map_start, 455 unsigned long *map_len); 456 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 457 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 458 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 459 u64 delalloc_end, struct page *locked_page, 460 unsigned bits_to_clear, 461 unsigned long page_ops); 462 struct bio * 463 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 464 gfp_t gfp_flags); 465 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 466 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 467 468 struct btrfs_fs_info; 469 struct btrfs_inode; 470 471 int repair_io_failure(struct btrfs_inode *inode, u64 start, u64 length, 472 u64 logical, struct page *page, 473 unsigned int pg_offset, int mirror_num); 474 int clean_io_failure(struct btrfs_inode *inode, u64 start, 475 struct page *page, unsigned int pg_offset); 476 void end_extent_writepage(struct page *page, int err, u64 start, u64 end); 477 int repair_eb_io_failure(struct btrfs_fs_info *fs_info, 478 struct extent_buffer *eb, int mirror_num); 479 480 /* 481 * When IO fails, either with EIO or csum verification fails, we 482 * try other mirrors that might have a good copy of the data. This 483 * io_failure_record is used to record state as we go through all the 484 * mirrors. If another mirror has good data, the page is set up to date 485 * and things continue. If a good mirror can't be found, the original 486 * bio end_io callback is called to indicate things have failed. 487 */ 488 struct io_failure_record { 489 struct page *page; 490 u64 start; 491 u64 len; 492 u64 logical; 493 unsigned long bio_flags; 494 int this_mirror; 495 int failed_mirror; 496 int in_validation; 497 }; 498 499 500 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, 501 u64 end); 502 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 503 struct io_failure_record **failrec_ret); 504 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 505 struct io_failure_record *failrec, int fail_mirror); 506 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 507 struct io_failure_record *failrec, 508 struct page *page, int pg_offset, int icsum, 509 bio_end_io_t *endio_func, void *data); 510 int free_io_failure(struct btrfs_inode *inode, struct io_failure_record *rec); 511 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 512 noinline u64 find_lock_delalloc_range(struct inode *inode, 513 struct extent_io_tree *tree, 514 struct page *locked_page, u64 *start, 515 u64 *end, u64 max_bytes); 516 #endif 517 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 518 u64 start); 519 #endif 520