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 void le_bitmap_set(u8 *map, unsigned int start, int len); 87 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 99 typedef blk_status_t (extent_submit_bio_start_t)(void *private_data, 100 struct bio *bio, u64 bio_offset); 101 102 typedef blk_status_t (extent_submit_bio_done_t)(void *private_data, 103 struct bio *bio, int mirror_num); 104 105 struct extent_io_ops { 106 /* 107 * The following callbacks must be allways defined, the function 108 * pointer will be called unconditionally. 109 */ 110 extent_submit_bio_hook_t *submit_bio_hook; 111 int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, 112 struct page *page, u64 start, u64 end, 113 int mirror); 114 int (*merge_bio_hook)(struct page *page, unsigned long offset, 115 size_t size, struct bio *bio, 116 unsigned long bio_flags); 117 int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); 118 struct btrfs_fs_info *(*tree_fs_info)(void *private_data); 119 void (*set_range_writeback)(void *private_data, u64 start, u64 end); 120 121 /* 122 * Optional hooks, called if the pointer is not NULL 123 */ 124 int (*fill_delalloc)(void *private_data, struct page *locked_page, 125 u64 start, u64 end, int *page_started, 126 unsigned long *nr_written, 127 struct writeback_control *wbc); 128 129 int (*writepage_start_hook)(struct page *page, u64 start, u64 end); 130 void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, 131 struct extent_state *state, int uptodate); 132 void (*set_bit_hook)(void *private_data, struct extent_state *state, 133 unsigned *bits); 134 void (*clear_bit_hook)(void *private_data, 135 struct extent_state *state, 136 unsigned *bits); 137 void (*merge_extent_hook)(void *private_data, 138 struct extent_state *new, 139 struct extent_state *other); 140 void (*split_extent_hook)(void *private_data, 141 struct extent_state *orig, u64 split); 142 void (*check_extent_io_range)(void *private_data, const char *caller, 143 u64 start, u64 end); 144 }; 145 146 struct extent_io_tree { 147 struct rb_root state; 148 void *private_data; 149 u64 dirty_bytes; 150 int track_uptodate; 151 spinlock_t lock; 152 const struct extent_io_ops *ops; 153 }; 154 155 struct extent_state { 156 u64 start; 157 u64 end; /* inclusive */ 158 struct rb_node rb_node; 159 160 /* ADD NEW ELEMENTS AFTER THIS */ 161 wait_queue_head_t wq; 162 refcount_t refs; 163 unsigned state; 164 165 struct io_failure_record *failrec; 166 167 #ifdef CONFIG_BTRFS_DEBUG 168 struct list_head leak_list; 169 #endif 170 }; 171 172 #define INLINE_EXTENT_BUFFER_PAGES 16 173 #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) 174 struct extent_buffer { 175 u64 start; 176 unsigned long len; 177 unsigned long bflags; 178 struct btrfs_fs_info *fs_info; 179 spinlock_t refs_lock; 180 atomic_t refs; 181 atomic_t io_pages; 182 int read_mirror; 183 struct rcu_head rcu_head; 184 pid_t lock_owner; 185 186 /* count of read lock holders on the extent buffer */ 187 atomic_t write_locks; 188 atomic_t read_locks; 189 atomic_t blocking_writers; 190 atomic_t blocking_readers; 191 atomic_t spinning_readers; 192 atomic_t spinning_writers; 193 short lock_nested; 194 /* >= 0 if eb belongs to a log tree, -1 otherwise */ 195 short log_index; 196 197 /* protects write locks */ 198 rwlock_t lock; 199 200 /* readers use lock_wq while they wait for the write 201 * lock holders to unlock 202 */ 203 wait_queue_head_t write_lock_wq; 204 205 /* writers use read_lock_wq while they wait for readers 206 * to unlock 207 */ 208 wait_queue_head_t read_lock_wq; 209 struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; 210 #ifdef CONFIG_BTRFS_DEBUG 211 struct list_head leak_list; 212 #endif 213 }; 214 215 /* 216 * Structure to record how many bytes and which ranges are set/cleared 217 */ 218 struct extent_changeset { 219 /* How many bytes are set/cleared in this operation */ 220 unsigned int bytes_changed; 221 222 /* Changed ranges */ 223 struct ulist range_changed; 224 }; 225 226 static inline void extent_changeset_init(struct extent_changeset *changeset) 227 { 228 changeset->bytes_changed = 0; 229 ulist_init(&changeset->range_changed); 230 } 231 232 static inline struct extent_changeset *extent_changeset_alloc(void) 233 { 234 struct extent_changeset *ret; 235 236 ret = kmalloc(sizeof(*ret), GFP_KERNEL); 237 if (!ret) 238 return NULL; 239 240 extent_changeset_init(ret); 241 return ret; 242 } 243 244 static inline void extent_changeset_release(struct extent_changeset *changeset) 245 { 246 if (!changeset) 247 return; 248 changeset->bytes_changed = 0; 249 ulist_release(&changeset->range_changed); 250 } 251 252 static inline void extent_changeset_free(struct extent_changeset *changeset) 253 { 254 if (!changeset) 255 return; 256 extent_changeset_release(changeset); 257 kfree(changeset); 258 } 259 260 static inline void extent_set_compress_type(unsigned long *bio_flags, 261 int compress_type) 262 { 263 *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; 264 } 265 266 static inline int extent_compress_type(unsigned long bio_flags) 267 { 268 return bio_flags >> EXTENT_BIO_FLAG_SHIFT; 269 } 270 271 struct extent_map_tree; 272 273 typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, 274 struct page *page, 275 size_t pg_offset, 276 u64 start, u64 len, 277 int create); 278 279 void extent_io_tree_init(struct extent_io_tree *tree, void *private_data); 280 int try_release_extent_mapping(struct extent_map_tree *map, 281 struct extent_io_tree *tree, struct page *page, 282 gfp_t mask); 283 int try_release_extent_buffer(struct page *page); 284 int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 285 struct extent_state **cached); 286 287 static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) 288 { 289 return lock_extent_bits(tree, start, end, NULL); 290 } 291 292 int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); 293 int extent_read_full_page(struct extent_io_tree *tree, struct page *page, 294 get_extent_t *get_extent, int mirror_num); 295 int __init extent_io_init(void); 296 void __cold extent_io_exit(void); 297 298 u64 count_range_bits(struct extent_io_tree *tree, 299 u64 *start, u64 search_end, 300 u64 max_bytes, unsigned bits, int contig); 301 302 void free_extent_state(struct extent_state *state); 303 int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, 304 unsigned bits, int filled, 305 struct extent_state *cached_state); 306 int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 307 unsigned bits, struct extent_changeset *changeset); 308 int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 309 unsigned bits, int wake, int delete, 310 struct extent_state **cached); 311 int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 312 unsigned bits, int wake, int delete, 313 struct extent_state **cached, gfp_t mask, 314 struct extent_changeset *changeset); 315 316 static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) 317 { 318 return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL); 319 } 320 321 static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, 322 u64 end, struct extent_state **cached) 323 { 324 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 325 GFP_NOFS, NULL); 326 } 327 328 static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree, 329 u64 start, u64 end, struct extent_state **cached) 330 { 331 return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, 332 GFP_ATOMIC, NULL); 333 } 334 335 static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, 336 u64 end, unsigned bits) 337 { 338 int wake = 0; 339 340 if (bits & EXTENT_LOCKED) 341 wake = 1; 342 343 return clear_extent_bit(tree, start, end, bits, wake, 0, NULL); 344 } 345 346 int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, 347 unsigned bits, struct extent_changeset *changeset); 348 int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 349 unsigned bits, u64 *failed_start, 350 struct extent_state **cached_state, gfp_t mask); 351 352 static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, 353 u64 end, unsigned bits) 354 { 355 return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); 356 } 357 358 static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, 359 u64 end, struct extent_state **cached_state) 360 { 361 return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, 362 cached_state, GFP_NOFS, NULL); 363 } 364 365 static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, 366 u64 end, gfp_t mask) 367 { 368 return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, 369 NULL, mask); 370 } 371 372 static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, 373 u64 end) 374 { 375 return clear_extent_bit(tree, start, end, 376 EXTENT_DIRTY | EXTENT_DELALLOC | 377 EXTENT_DO_ACCOUNTING, 0, 0, NULL); 378 } 379 380 int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 381 unsigned bits, unsigned clear_bits, 382 struct extent_state **cached_state); 383 384 static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, 385 u64 end, unsigned int extra_bits, 386 struct extent_state **cached_state) 387 { 388 return set_extent_bit(tree, start, end, 389 EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits, 390 NULL, cached_state, GFP_NOFS); 391 } 392 393 static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, 394 u64 end, struct extent_state **cached_state) 395 { 396 return set_extent_bit(tree, start, end, 397 EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, 398 NULL, cached_state, GFP_NOFS); 399 } 400 401 static inline int set_extent_new(struct extent_io_tree *tree, u64 start, 402 u64 end) 403 { 404 return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, 405 GFP_NOFS); 406 } 407 408 static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, 409 u64 end, struct extent_state **cached_state, gfp_t mask) 410 { 411 return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, 412 cached_state, mask); 413 } 414 415 int find_first_extent_bit(struct extent_io_tree *tree, u64 start, 416 u64 *start_ret, u64 *end_ret, unsigned bits, 417 struct extent_state **cached_state); 418 int extent_invalidatepage(struct extent_io_tree *tree, 419 struct page *page, unsigned long offset); 420 int extent_write_full_page(struct page *page, struct writeback_control *wbc); 421 int extent_write_locked_range(struct inode *inode, u64 start, u64 end, 422 int mode); 423 int extent_writepages(struct extent_io_tree *tree, 424 struct address_space *mapping, 425 struct writeback_control *wbc); 426 int btree_write_cache_pages(struct address_space *mapping, 427 struct writeback_control *wbc); 428 int extent_readpages(struct extent_io_tree *tree, 429 struct address_space *mapping, 430 struct list_head *pages, unsigned nr_pages); 431 int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, 432 __u64 start, __u64 len); 433 void set_page_extent_mapped(struct page *page); 434 435 struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, 436 u64 start); 437 struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 438 u64 start, unsigned long len); 439 struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, 440 u64 start); 441 struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); 442 struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, 443 u64 start); 444 void free_extent_buffer(struct extent_buffer *eb); 445 void free_extent_buffer_stale(struct extent_buffer *eb); 446 #define WAIT_NONE 0 447 #define WAIT_COMPLETE 1 448 #define WAIT_PAGE_LOCK 2 449 int read_extent_buffer_pages(struct extent_io_tree *tree, 450 struct extent_buffer *eb, int wait, 451 int mirror_num); 452 void wait_on_extent_buffer_writeback(struct extent_buffer *eb); 453 454 static inline unsigned long num_extent_pages(u64 start, u64 len) 455 { 456 return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - 457 (start >> PAGE_SHIFT); 458 } 459 460 static inline void extent_buffer_get(struct extent_buffer *eb) 461 { 462 atomic_inc(&eb->refs); 463 } 464 465 static inline int extent_buffer_uptodate(struct extent_buffer *eb) 466 { 467 return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); 468 } 469 470 int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, 471 unsigned long start, unsigned long len); 472 void read_extent_buffer(const struct extent_buffer *eb, void *dst, 473 unsigned long start, 474 unsigned long len); 475 int read_extent_buffer_to_user(const struct extent_buffer *eb, 476 void __user *dst, unsigned long start, 477 unsigned long len); 478 void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src); 479 void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, 480 const void *src); 481 void write_extent_buffer(struct extent_buffer *eb, const void *src, 482 unsigned long start, unsigned long len); 483 void copy_extent_buffer_full(struct extent_buffer *dst, 484 struct extent_buffer *src); 485 void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, 486 unsigned long dst_offset, unsigned long src_offset, 487 unsigned long len); 488 void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 489 unsigned long src_offset, unsigned long len); 490 void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, 491 unsigned long src_offset, unsigned long len); 492 void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, 493 unsigned long len); 494 int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, 495 unsigned long pos); 496 void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, 497 unsigned long pos, unsigned long len); 498 void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, 499 unsigned long pos, unsigned long len); 500 void clear_extent_buffer_dirty(struct extent_buffer *eb); 501 int set_extent_buffer_dirty(struct extent_buffer *eb); 502 void set_extent_buffer_uptodate(struct extent_buffer *eb); 503 void clear_extent_buffer_uptodate(struct extent_buffer *eb); 504 int extent_buffer_under_io(struct extent_buffer *eb); 505 int map_private_extent_buffer(const struct extent_buffer *eb, 506 unsigned long offset, unsigned long min_len, 507 char **map, unsigned long *map_start, 508 unsigned long *map_len); 509 void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); 510 void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); 511 void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, 512 u64 delalloc_end, struct page *locked_page, 513 unsigned bits_to_clear, 514 unsigned long page_ops); 515 struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte); 516 struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs); 517 struct bio *btrfs_bio_clone(struct bio *bio); 518 struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size); 519 520 struct btrfs_fs_info; 521 struct btrfs_inode; 522 523 int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, 524 u64 length, u64 logical, struct page *page, 525 unsigned int pg_offset, int mirror_num); 526 int clean_io_failure(struct btrfs_fs_info *fs_info, 527 struct extent_io_tree *failure_tree, 528 struct extent_io_tree *io_tree, u64 start, 529 struct page *page, u64 ino, unsigned int pg_offset); 530 void end_extent_writepage(struct page *page, int err, u64 start, u64 end); 531 int repair_eb_io_failure(struct btrfs_fs_info *fs_info, 532 struct extent_buffer *eb, int mirror_num); 533 534 /* 535 * When IO fails, either with EIO or csum verification fails, we 536 * try other mirrors that might have a good copy of the data. This 537 * io_failure_record is used to record state as we go through all the 538 * mirrors. If another mirror has good data, the page is set up to date 539 * and things continue. If a good mirror can't be found, the original 540 * bio end_io callback is called to indicate things have failed. 541 */ 542 struct io_failure_record { 543 struct page *page; 544 u64 start; 545 u64 len; 546 u64 logical; 547 unsigned long bio_flags; 548 int this_mirror; 549 int failed_mirror; 550 int in_validation; 551 }; 552 553 554 void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, 555 u64 end); 556 int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, 557 struct io_failure_record **failrec_ret); 558 bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages, 559 struct io_failure_record *failrec, int fail_mirror); 560 struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, 561 struct io_failure_record *failrec, 562 struct page *page, int pg_offset, int icsum, 563 bio_end_io_t *endio_func, void *data); 564 int free_io_failure(struct extent_io_tree *failure_tree, 565 struct extent_io_tree *io_tree, 566 struct io_failure_record *rec); 567 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS 568 noinline u64 find_lock_delalloc_range(struct inode *inode, 569 struct extent_io_tree *tree, 570 struct page *locked_page, u64 *start, 571 u64 *end, u64 max_bytes); 572 #endif 573 struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, 574 u64 start); 575 #endif 576