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