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 extent_submit_bio_hook_t *submit_bio_hook; 75 int (*merge_bio_hook)(int rw, struct page *page, unsigned long offset, 76 size_t size, struct bio *bio, 77 unsigned long bio_flags); 78 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 79 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 80 struct page *page, u64 start, u64 end, 81 int mirror); 82 int (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 83 struct extent_state *state, int uptodate); 84 void (*set_bit_hook)(struct inode *inode, struct extent_state *state, 85 unsigned *bits); 86 void (*clear_bit_hook)(struct inode *inode, struct extent_state *state, 87 unsigned *bits); 88 void (*merge_extent_hook)(struct inode *inode, 89 struct extent_state *new, 90 struct extent_state *other); 91 void (*split_extent_hook)(struct inode *inode, 92 struct extent_state *orig, u64 split); 93 }; 94 95 struct extent_io_tree { 96 struct rb_root state; 97 struct address_space *mapping; 98 u64 dirty_bytes; 99 int track_uptodate; 100 spinlock_t lock; 101 const struct extent_io_ops *ops; 102 }; 103 104 struct extent_state { 105 u64 start; 106 u64 end; /* inclusive */ 107 struct rb_node rb_node; 108 109 /* ADD NEW ELEMENTS AFTER THIS */ 110 wait_queue_head_t wq; 111 atomic_t refs; 112 unsigned state; 113 114 struct io_failure_record *failrec; 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_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 /* 165 * Structure to record how many bytes and which ranges are set/cleared 166 */ 167 struct extent_changeset { 168 /* How many bytes are set/cleared in this operation */ 169 u64 bytes_changed; 170 171 /* Changed ranges */ 172 struct ulist *range_changed; 173 }; 174 175 static inline void extent_set_compress_type(unsigned long *bio_flags, 176 int compress_type) 177 { 178 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 179 } 180 181 static inline int extent_compress_type(unsigned long bio_flags) 182 { 183 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 184 } 185 186 struct extent_map_tree; 187 188 typedef struct extent_map *(get_extent_t)(struct inode *inode, 189 struct page *page, 190 size_t pg_offset, 191 u64 start, u64 len, 192 int create); 193 194 void extent_io_tree_init(struct extent_io_tree *tree, 195 struct address_space *mapping); 196 int try_release_extent_mapping(struct extent_map_tree *map, 197 struct extent_io_tree *tree, struct page *page, 198 gfp_t mask); 199 int try_release_extent_buffer(struct page *page); 200 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 201 struct extent_state **cached); 202 203 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 204 { 205 return lock_extent_bits(tree, start, end, NULL); 206 } 207 208 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 __init extent_io_init(void); 212 void extent_io_exit(void); 213 214 u64 count_range_bits(struct extent_io_tree *tree, 215 u64 *start, u64 search_end, 216 u64 max_bytes, unsigned bits, int contig); 217 218 void free_extent_state(struct extent_state *state); 219 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 220 unsigned bits, int filled, 221 struct extent_state *cached_state); 222 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 223 unsigned bits, struct extent_changeset *changeset); 224 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 225 unsigned bits, int wake, int delete, 226 struct extent_state **cached, gfp_t mask); 227 228 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) 229 { 230 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, 231 GFP_NOFS); 232 } 233 234 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, 235 u64 end, struct extent_state **cached, gfp_t mask) 236 { 237 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 238 mask); 239 } 240 241 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, 242 u64 end, unsigned bits) 243 { 244 int wake = 0; 245 246 if (bits & EXTENT_LOCKED) 247 wake = 1; 248 249 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, 250 GFP_NOFS); 251 } 252 253 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 254 unsigned bits, struct extent_changeset *changeset); 255 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 256 unsigned bits, u64 *failed_start, 257 struct extent_state **cached_state, gfp_t mask); 258 259 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, 260 u64 end, unsigned bits) 261 { 262 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); 263 } 264 265 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, 266 u64 end, struct extent_state **cached_state, gfp_t mask) 267 { 268 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, 269 cached_state, mask); 270 } 271 272 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, 273 u64 end, gfp_t mask) 274 { 275 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, 276 NULL, mask); 277 } 278 279 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, 280 u64 end) 281 { 282 return clear_extent_bit(tree, start, end, 283 EXTENT_DIRTY | EXTENT_DELALLOC | 284 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); 285 } 286 287 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 288 unsigned bits, unsigned clear_bits, 289 struct extent_state **cached_state); 290 291 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, 292 u64 end, struct extent_state **cached_state) 293 { 294 return set_extent_bit(tree, start, end, 295 EXTENT_DELALLOC | EXTENT_UPTODATE, 296 NULL, cached_state, GFP_NOFS); 297 } 298 299 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, 300 u64 end, struct extent_state **cached_state) 301 { 302 return set_extent_bit(tree, start, end, 303 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, 304 NULL, cached_state, GFP_NOFS); 305 } 306 307 static inline int set_extent_new(struct extent_io_tree *tree, u64 start, 308 u64 end) 309 { 310 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, 311 GFP_NOFS); 312 } 313 314 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, 315 u64 end, struct extent_state **cached_state, gfp_t mask) 316 { 317 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, 318 cached_state, mask); 319 } 320 321 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 322 u64 *start_ret, u64 *end_ret, unsigned bits, 323 struct extent_state **cached_state); 324 int extent_invalidatepage(struct extent_io_tree *tree, 325 struct page *page, unsigned long offset); 326 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 327 get_extent_t *get_extent, 328 struct writeback_control *wbc); 329 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 330 u64 start, u64 end, get_extent_t *get_extent, 331 int mode); 332 int extent_writepages(struct extent_io_tree *tree, 333 struct address_space *mapping, 334 get_extent_t *get_extent, 335 struct writeback_control *wbc); 336 int btree_write_cache_pages(struct address_space *mapping, 337 struct writeback_control *wbc); 338 int extent_readpages(struct extent_io_tree *tree, 339 struct address_space *mapping, 340 struct list_head *pages, unsigned nr_pages, 341 get_extent_t get_extent); 342 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 343 __u64 start, __u64 len, get_extent_t *get_extent); 344 void set_page_extent_mapped(struct page *page); 345 346 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 347 u64 start); 348 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 349 u64 start, unsigned long len); 350 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 351 u64 start); 352 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 353 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 354 u64 start); 355 void free_extent_buffer(struct extent_buffer *eb); 356 void free_extent_buffer_stale(struct extent_buffer *eb); 357 #define WAIT_NONE 0 358 #define WAIT_COMPLETE 1 359 #define WAIT_PAGE_LOCK 2 360 int read_extent_buffer_pages(struct extent_io_tree *tree, 361 struct extent_buffer *eb, u64 start, int wait, 362 get_extent_t *get_extent, int mirror_num); 363 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 364 365 static inline unsigned long num_extent_pages(u64 start, u64 len) 366 { 367 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 368 (start >> PAGE_SHIFT); 369 } 370 371 static inline void extent_buffer_get(struct extent_buffer *eb) 372 { 373 atomic_inc(&eb->refs); 374 } 375 376 int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, 377 unsigned long start, 378 unsigned long len); 379 void read_extent_buffer(struct extent_buffer *eb, void *dst, 380 unsigned long start, 381 unsigned long len); 382 int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dst, 383 unsigned long start, 384 unsigned long len); 385 void write_extent_buffer(struct extent_buffer *eb, const void *src, 386 unsigned long start, unsigned long len); 387 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 388 unsigned long dst_offset, unsigned long src_offset, 389 unsigned long len); 390 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 391 unsigned long src_offset, unsigned long len); 392 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 393 unsigned long src_offset, unsigned long len); 394 void memset_extent_buffer(struct extent_buffer *eb, char c, 395 unsigned long start, unsigned long len); 396 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 397 unsigned long pos); 398 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 399 unsigned long pos, unsigned long len); 400 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, 401 unsigned long pos, unsigned long len); 402 void clear_extent_buffer_dirty(struct extent_buffer *eb); 403 int set_extent_buffer_dirty(struct extent_buffer *eb); 404 void set_extent_buffer_uptodate(struct extent_buffer *eb); 405 void clear_extent_buffer_uptodate(struct extent_buffer *eb); 406 int extent_buffer_uptodate(struct extent_buffer *eb); 407 int extent_buffer_under_io(struct extent_buffer *eb); 408 int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, 409 unsigned long min_len, char **map, 410 unsigned long *map_start, 411 unsigned long *map_len); 412 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 413 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 414 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 415 struct page *locked_page, 416 unsigned bits_to_clear, 417 unsigned long page_ops); 418 struct bio * 419 btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, 420 gfp_t gfp_flags); 421 struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs); 422 struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask); 423 424 struct btrfs_fs_info; 425 426 int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, 427 struct page *page, unsigned int pg_offset, 428 int mirror_num); 429 int clean_io_failure(struct inode *inode, u64 start, struct page *page, 430 unsigned int pg_offset); 431 void end_extent_writepage(struct page *page, int err, u64 start, u64 end); 432 int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, 433 int mirror_num); 434 435 /* 436 * When IO fails, either with EIO or csum verification fails, we 437 * try other mirrors that might have a good copy of the data. This 438 * io_failure_record is used to record state as we go through all the 439 * mirrors. If another mirror has good data, the page is set up to date 440 * and things continue. If a good mirror can't be found, the original 441 * bio end_io callback is called to indicate things have failed. 442 */ 443 struct io_failure_record { 444 struct page *page; 445 u64 start; 446 u64 len; 447 u64 logical; 448 unsigned long bio_flags; 449 int this_mirror; 450 int failed_mirror; 451 int in_validation; 452 }; 453 454 void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end); 455 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 456 struct io_failure_record **failrec_ret); 457 int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 458 struct io_failure_record *failrec, int fail_mirror); 459 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 460 struct io_failure_record *failrec, 461 struct page *page, int pg_offset, int icsum, 462 bio_end_io_t *endio_func, void *data); 463 int free_io_failure(struct inode *inode, struct io_failure_record *rec); 464 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 465 noinline u64 find_lock_delalloc_range(struct inode *inode, 466 struct extent_io_tree *tree, 467 struct page *locked_page, u64 *start, 468 u64 *end, u64 max_bytes); 469 #endif 470 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 471 u64 start); 472 #endif 473