1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __EXTENTIO__ 3 #define __EXTENTIO__ 4 5 #include <linux/rbtree.h> 6 #include <linux/refcount.h> 7 #include "ulist.h" 8 9 /* bits for the extent state */ 10 #define EXTENT_DIRTY (1U << 0) 11 #define EXTENT_WRITEBACK (1U << 1) 12 #define EXTENT_UPTODATE (1U << 2) 13 #define EXTENT_LOCKED (1U << 3) 14 #define EXTENT_NEW (1U << 4) 15 #define EXTENT_DELALLOC (1U << 5) 16 #define EXTENT_DEFRAG (1U << 6) 17 #define EXTENT_BOUNDARY (1U << 9) 18 #define EXTENT_NODATASUM (1U << 10) 19 #define EXTENT_CLEAR_META_RESV (1U << 11) 20 #define EXTENT_FIRST_DELALLOC (1U << 12) 21 #define EXTENT_NEED_WAIT (1U << 13) 22 #define EXTENT_DAMAGED (1U << 14) 23 #define EXTENT_NORESERVE (1U << 15) 24 #define EXTENT_QGROUP_RESERVED (1U << 16) 25 #define EXTENT_CLEAR_DATA_RESV (1U << 17) 26 #define EXTENT_DELALLOC_NEW (1U << 18) 27 #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) 28 #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \ 29 EXTENT_CLEAR_DATA_RESV) 30 #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) 31 32 /* 33 * flags for bio submission. The high bits indicate the compression 34 * type for this bio 35 */ 36 #define EXTENT_BIO_COMPRESSED 1 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 blk_status_t (extent_submit_bio_hook_t)(void *private_data, 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 struct btrfs_fs_info *(*tree_fs_info)(void *private_data); 112 void (*set_range_writeback)(void *private_data, u64 start, u64 end); 113 114 /* 115 * Optional hooks, called if the pointer is not NULL 116 */ 117 int (*fill_delalloc)(void *private_data, struct page *locked_page, 118 u64 start, u64 end, int *page_started, 119 unsigned long *nr_written, 120 struct writeback_control *wbc); 121 122 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 123 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 124 struct extent_state *state, int uptodate); 125 void (*set_bit_hook)(void *private_data, struct extent_state *state, 126 unsigned *bits); 127 void (*clear_bit_hook)(void *private_data, 128 struct extent_state *state, 129 unsigned *bits); 130 void (*merge_extent_hook)(void *private_data, 131 struct extent_state *new, 132 struct extent_state *other); 133 void (*split_extent_hook)(void *private_data, 134 struct extent_state *orig, u64 split); 135 void (*check_extent_io_range)(void *private_data, const char *caller, 136 u64 start, u64 end); 137 }; 138 139 struct extent_io_tree { 140 struct rb_root state; 141 void *private_data; 142 u64 dirty_bytes; 143 int track_uptodate; 144 spinlock_t lock; 145 const struct extent_io_ops *ops; 146 }; 147 148 struct extent_state { 149 u64 start; 150 u64 end; /* inclusive */ 151 struct rb_node rb_node; 152 153 /* ADD NEW ELEMENTS AFTER THIS */ 154 wait_queue_head_t wq; 155 refcount_t refs; 156 unsigned state; 157 158 struct io_failure_record *failrec; 159 160 #ifdef CONFIG_BTRFS_DEBUG 161 struct list_head leak_list; 162 #endif 163 }; 164 165 #define INLINE_EXTENT_BUFFER_PAGES 16 166 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) 167 struct extent_buffer { 168 u64 start; 169 unsigned long len; 170 unsigned long bflags; 171 struct btrfs_fs_info *fs_info; 172 spinlock_t refs_lock; 173 atomic_t refs; 174 atomic_t io_pages; 175 int read_mirror; 176 struct rcu_head rcu_head; 177 pid_t lock_owner; 178 179 /* count of read lock holders on the extent buffer */ 180 atomic_t write_locks; 181 atomic_t read_locks; 182 atomic_t blocking_writers; 183 atomic_t blocking_readers; 184 atomic_t spinning_readers; 185 atomic_t spinning_writers; 186 short lock_nested; 187 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 188 short log_index; 189 190 /* protects write locks */ 191 rwlock_t lock; 192 193 /* readers use lock_wq while they wait for the write 194 * lock holders to unlock 195 */ 196 wait_queue_head_t write_lock_wq; 197 198 /* writers use read_lock_wq while they wait for readers 199 * to unlock 200 */ 201 wait_queue_head_t read_lock_wq; 202 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 203 #ifdef CONFIG_BTRFS_DEBUG 204 struct list_head leak_list; 205 #endif 206 }; 207 208 /* 209 * Structure to record how many bytes and which ranges are set/cleared 210 */ 211 struct extent_changeset { 212 /* How many bytes are set/cleared in this operation */ 213 unsigned int bytes_changed; 214 215 /* Changed ranges */ 216 struct ulist range_changed; 217 }; 218 219 static inline void extent_changeset_init(struct extent_changeset *changeset) 220 { 221 changeset->bytes_changed = 0; 222 ulist_init(&changeset->range_changed); 223 } 224 225 static inline struct extent_changeset *extent_changeset_alloc(void) 226 { 227 struct extent_changeset *ret; 228 229 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 230 if (!ret) 231 return NULL; 232 233 extent_changeset_init(ret); 234 return ret; 235 } 236 237 static inline void extent_changeset_release(struct extent_changeset *changeset) 238 { 239 if (!changeset) 240 return; 241 changeset->bytes_changed = 0; 242 ulist_release(&changeset->range_changed); 243 } 244 245 static inline void extent_changeset_free(struct extent_changeset *changeset) 246 { 247 if (!changeset) 248 return; 249 extent_changeset_release(changeset); 250 kfree(changeset); 251 } 252 253 static inline void extent_set_compress_type(unsigned long *bio_flags, 254 int compress_type) 255 { 256 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 257 } 258 259 static inline int extent_compress_type(unsigned long bio_flags) 260 { 261 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 262 } 263 264 struct extent_map_tree; 265 266 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, 267 struct page *page, 268 size_t pg_offset, 269 u64 start, u64 len, 270 int create); 271 272 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data); 273 int try_release_extent_mapping(struct extent_map_tree *map, 274 struct extent_io_tree *tree, struct page *page, 275 gfp_t mask); 276 int try_release_extent_buffer(struct page *page); 277 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 278 struct extent_state **cached); 279 280 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 281 { 282 return lock_extent_bits(tree, start, end, NULL); 283 } 284 285 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 286 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 287 get_extent_t *get_extent, int mirror_num); 288 int __init extent_io_init(void); 289 void extent_io_exit(void); 290 291 u64 count_range_bits(struct extent_io_tree *tree, 292 u64 *start, u64 search_end, 293 u64 max_bytes, unsigned bits, int contig); 294 295 void free_extent_state(struct extent_state *state); 296 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 297 unsigned bits, int filled, 298 struct extent_state *cached_state); 299 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 300 unsigned bits, struct extent_changeset *changeset); 301 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 302 unsigned bits, int wake, int delete, 303 struct extent_state **cached, gfp_t mask); 304 305 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) 306 { 307 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, 308 GFP_NOFS); 309 } 310 311 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, 312 u64 end, struct extent_state **cached, gfp_t mask) 313 { 314 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 315 mask); 316 } 317 318 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, 319 u64 end, unsigned bits) 320 { 321 int wake = 0; 322 323 if (bits & EXTENT_LOCKED) 324 wake = 1; 325 326 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL, 327 GFP_NOFS); 328 } 329 330 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 331 unsigned bits, struct extent_changeset *changeset); 332 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 333 unsigned bits, u64 *failed_start, 334 struct extent_state **cached_state, gfp_t mask); 335 336 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, 337 u64 end, unsigned bits) 338 { 339 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); 340 } 341 342 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, 343 u64 end, struct extent_state **cached_state, gfp_t mask) 344 { 345 return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, 346 cached_state, mask); 347 } 348 349 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, 350 u64 end, gfp_t mask) 351 { 352 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, 353 NULL, mask); 354 } 355 356 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, 357 u64 end) 358 { 359 return clear_extent_bit(tree, start, end, 360 EXTENT_DIRTY | EXTENT_DELALLOC | 361 EXTENT_DO_ACCOUNTING, 0, 0, NULL, GFP_NOFS); 362 } 363 364 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 365 unsigned bits, unsigned clear_bits, 366 struct extent_state **cached_state); 367 368 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, 369 u64 end, unsigned int extra_bits, 370 struct extent_state **cached_state) 371 { 372 return set_extent_bit(tree, start, end, 373 EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits, 374 NULL, cached_state, GFP_NOFS); 375 } 376 377 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, 378 u64 end, struct extent_state **cached_state) 379 { 380 return set_extent_bit(tree, start, end, 381 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, 382 NULL, cached_state, GFP_NOFS); 383 } 384 385 static inline int set_extent_new(struct extent_io_tree *tree, u64 start, 386 u64 end) 387 { 388 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, 389 GFP_NOFS); 390 } 391 392 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, 393 u64 end, struct extent_state **cached_state, gfp_t mask) 394 { 395 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, 396 cached_state, mask); 397 } 398 399 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 400 u64 *start_ret, u64 *end_ret, unsigned bits, 401 struct extent_state **cached_state); 402 int extent_invalidatepage(struct extent_io_tree *tree, 403 struct page *page, unsigned long offset); 404 int extent_write_full_page(struct extent_io_tree *tree, struct page *page, 405 get_extent_t *get_extent, 406 struct writeback_control *wbc); 407 int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, 408 u64 start, u64 end, get_extent_t *get_extent, 409 int mode); 410 int extent_writepages(struct extent_io_tree *tree, 411 struct address_space *mapping, 412 get_extent_t *get_extent, 413 struct writeback_control *wbc); 414 int btree_write_cache_pages(struct address_space *mapping, 415 struct writeback_control *wbc); 416 int extent_readpages(struct extent_io_tree *tree, 417 struct address_space *mapping, 418 struct list_head *pages, unsigned nr_pages, 419 get_extent_t get_extent); 420 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 421 __u64 start, __u64 len, get_extent_t *get_extent); 422 void set_page_extent_mapped(struct page *page); 423 424 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 425 u64 start); 426 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 427 u64 start, unsigned long len); 428 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 429 u64 start); 430 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 431 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 432 u64 start); 433 void free_extent_buffer(struct extent_buffer *eb); 434 void free_extent_buffer_stale(struct extent_buffer *eb); 435 #define WAIT_NONE 0 436 #define WAIT_COMPLETE 1 437 #define WAIT_PAGE_LOCK 2 438 int read_extent_buffer_pages(struct extent_io_tree *tree, 439 struct extent_buffer *eb, int wait, 440 get_extent_t *get_extent, int mirror_num); 441 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 442 443 static inline unsigned long num_extent_pages(u64 start, u64 len) 444 { 445 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 446 (start >> PAGE_SHIFT); 447 } 448 449 static inline void extent_buffer_get(struct extent_buffer *eb) 450 { 451 atomic_inc(&eb->refs); 452 } 453 454 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, 455 unsigned long start, unsigned long len); 456 void read_extent_buffer(const struct extent_buffer *eb, void *dst, 457 unsigned long start, 458 unsigned long len); 459 int read_extent_buffer_to_user(const struct extent_buffer *eb, 460 void __user *dst, unsigned long start, 461 unsigned long len); 462 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src); 463 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, 464 const void *src); 465 void write_extent_buffer(struct extent_buffer *eb, const void *src, 466 unsigned long start, unsigned long len); 467 void copy_extent_buffer_full(struct extent_buffer *dst, 468 struct extent_buffer *src); 469 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 470 unsigned long dst_offset, unsigned long src_offset, 471 unsigned long len); 472 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 473 unsigned long src_offset, unsigned long len); 474 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 475 unsigned long src_offset, unsigned long len); 476 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, 477 unsigned long len); 478 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 479 unsigned long pos); 480 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 481 unsigned long pos, unsigned long len); 482 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, 483 unsigned long pos, unsigned long len); 484 void clear_extent_buffer_dirty(struct extent_buffer *eb); 485 int set_extent_buffer_dirty(struct extent_buffer *eb); 486 void set_extent_buffer_uptodate(struct extent_buffer *eb); 487 void clear_extent_buffer_uptodate(struct extent_buffer *eb); 488 int extent_buffer_uptodate(struct extent_buffer *eb); 489 int extent_buffer_under_io(struct extent_buffer *eb); 490 int map_private_extent_buffer(const struct extent_buffer *eb, 491 unsigned long offset, unsigned long min_len, 492 char **map, unsigned long *map_start, 493 unsigned long *map_len); 494 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 495 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 496 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 497 u64 delalloc_end, struct page *locked_page, 498 unsigned bits_to_clear, 499 unsigned long page_ops); 500 struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte); 501 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs); 502 struct bio *btrfs_bio_clone(struct bio *bio); 503 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size); 504 505 struct btrfs_fs_info; 506 struct btrfs_inode; 507 508 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 509 u64 length, u64 logical, struct page *page, 510 unsigned int pg_offset, int mirror_num); 511 int clean_io_failure(struct btrfs_fs_info *fs_info, 512 struct extent_io_tree *failure_tree, 513 struct extent_io_tree *io_tree, u64 start, 514 struct page *page, u64 ino, unsigned int pg_offset); 515 void end_extent_writepage(struct page *page, int err, u64 start, u64 end); 516 int repair_eb_io_failure(struct btrfs_fs_info *fs_info, 517 struct extent_buffer *eb, int mirror_num); 518 519 /* 520 * When IO fails, either with EIO or csum verification fails, we 521 * try other mirrors that might have a good copy of the data. This 522 * io_failure_record is used to record state as we go through all the 523 * mirrors. If another mirror has good data, the page is set up to date 524 * and things continue. If a good mirror can't be found, the original 525 * bio end_io callback is called to indicate things have failed. 526 */ 527 struct io_failure_record { 528 struct page *page; 529 u64 start; 530 u64 len; 531 u64 logical; 532 unsigned long bio_flags; 533 int this_mirror; 534 int failed_mirror; 535 int in_validation; 536 }; 537 538 539 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, 540 u64 end); 541 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 542 struct io_failure_record **failrec_ret); 543 bool btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, 544 struct io_failure_record *failrec, int fail_mirror); 545 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 546 struct io_failure_record *failrec, 547 struct page *page, int pg_offset, int icsum, 548 bio_end_io_t *endio_func, void *data); 549 int free_io_failure(struct extent_io_tree *failure_tree, 550 struct extent_io_tree *io_tree, 551 struct io_failure_record *rec); 552 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 553 noinline u64 find_lock_delalloc_range(struct inode *inode, 554 struct extent_io_tree *tree, 555 struct page *locked_page, u64 *start, 556 u64 *end, u64 max_bytes); 557 #endif 558 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 559 u64 start); 560 #endif 561