| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __EXTENTIO__ |
| #define __EXTENTIO__ |
| |
| #include <linux/rbtree.h> |
| #include <linux/refcount.h> |
| #include "ulist.h" |
| |
| /* bits for the extent state */ |
| #define EXTENT_DIRTY (1U << 0) |
| #define EXTENT_WRITEBACK (1U << 1) |
| #define EXTENT_UPTODATE (1U << 2) |
| #define EXTENT_LOCKED (1U << 3) |
| #define EXTENT_NEW (1U << 4) |
| #define EXTENT_DELALLOC (1U << 5) |
| #define EXTENT_DEFRAG (1U << 6) |
| #define EXTENT_BOUNDARY (1U << 9) |
| #define EXTENT_NODATASUM (1U << 10) |
| #define EXTENT_CLEAR_META_RESV (1U << 11) |
| #define EXTENT_FIRST_DELALLOC (1U << 12) |
| #define EXTENT_NEED_WAIT (1U << 13) |
| #define EXTENT_DAMAGED (1U << 14) |
| #define EXTENT_NORESERVE (1U << 15) |
| #define EXTENT_QGROUP_RESERVED (1U << 16) |
| #define EXTENT_CLEAR_DATA_RESV (1U << 17) |
| #define EXTENT_DELALLOC_NEW (1U << 18) |
| #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) |
| #define EXTENT_DO_ACCOUNTING (EXTENT_CLEAR_META_RESV | \ |
| EXTENT_CLEAR_DATA_RESV) |
| #define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC) |
| |
| /* |
| * flags for bio submission. The high bits indicate the compression |
| * type for this bio |
| */ |
| #define EXTENT_BIO_COMPRESSED 1 |
| #define EXTENT_BIO_FLAG_SHIFT 16 |
| |
| /* these are bit numbers for test/set bit */ |
| #define EXTENT_BUFFER_UPTODATE 0 |
| #define EXTENT_BUFFER_DIRTY 2 |
| #define EXTENT_BUFFER_CORRUPT 3 |
| #define EXTENT_BUFFER_READAHEAD 4 /* this got triggered by readahead */ |
| #define EXTENT_BUFFER_TREE_REF 5 |
| #define EXTENT_BUFFER_STALE 6 |
| #define EXTENT_BUFFER_WRITEBACK 7 |
| #define EXTENT_BUFFER_READ_ERR 8 /* read IO error */ |
| #define EXTENT_BUFFER_DUMMY 9 |
| #define EXTENT_BUFFER_IN_TREE 10 |
| #define EXTENT_BUFFER_WRITE_ERR 11 /* write IO error */ |
| |
| /* these are flags for __process_pages_contig */ |
| #define PAGE_UNLOCK (1 << 0) |
| #define PAGE_CLEAR_DIRTY (1 << 1) |
| #define PAGE_SET_WRITEBACK (1 << 2) |
| #define PAGE_END_WRITEBACK (1 << 3) |
| #define PAGE_SET_PRIVATE2 (1 << 4) |
| #define PAGE_SET_ERROR (1 << 5) |
| #define PAGE_LOCK (1 << 6) |
| |
| /* |
| * page->private values. Every page that is controlled by the extent |
| * map has page->private set to one. |
| */ |
| #define EXTENT_PAGE_PRIVATE 1 |
| |
| /* |
| * The extent buffer bitmap operations are done with byte granularity instead of |
| * word granularity for two reasons: |
| * 1. The bitmaps must be little-endian on disk. |
| * 2. Bitmap items are not guaranteed to be aligned to a word and therefore a |
| * single word in a bitmap may straddle two pages in the extent buffer. |
| */ |
| #define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) |
| #define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) |
| #define BITMAP_FIRST_BYTE_MASK(start) \ |
| ((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) |
| #define BITMAP_LAST_BYTE_MASK(nbits) \ |
| (BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) |
| |
| static inline int le_test_bit(int nr, const u8 *addr) |
| { |
| return 1U & (addr[BIT_BYTE(nr)] >> (nr & (BITS_PER_BYTE-1))); |
| } |
| |
| void le_bitmap_set(u8 *map, unsigned int start, int len); |
| void le_bitmap_clear(u8 *map, unsigned int start, int len); |
| |
| struct extent_state; |
| struct btrfs_root; |
| struct btrfs_inode; |
| struct btrfs_io_bio; |
| struct io_failure_record; |
| |
| typedef blk_status_t (extent_submit_bio_hook_t)(void *private_data, struct bio *bio, |
| int mirror_num, unsigned long bio_flags, |
| u64 bio_offset); |
| |
| typedef blk_status_t (extent_submit_bio_start_t)(void *private_data, |
| struct bio *bio, u64 bio_offset); |
| |
| typedef blk_status_t (extent_submit_bio_done_t)(void *private_data, |
| struct bio *bio, int mirror_num); |
| |
| struct extent_io_ops { |
| /* |
| * The following callbacks must be allways defined, the function |
| * pointer will be called unconditionally. |
| */ |
| extent_submit_bio_hook_t *submit_bio_hook; |
| int (*readpage_end_io_hook)(struct btrfs_io_bio *io_bio, u64 phy_offset, |
| struct page *page, u64 start, u64 end, |
| int mirror); |
| int (*merge_bio_hook)(struct page *page, unsigned long offset, |
| size_t size, struct bio *bio, |
| unsigned long bio_flags); |
| int (*readpage_io_failed_hook)(struct page *page, int failed_mirror); |
| struct btrfs_fs_info *(*tree_fs_info)(void *private_data); |
| void (*set_range_writeback)(void *private_data, u64 start, u64 end); |
| |
| /* |
| * Optional hooks, called if the pointer is not NULL |
| */ |
| int (*fill_delalloc)(void *private_data, struct page *locked_page, |
| u64 start, u64 end, int *page_started, |
| unsigned long *nr_written, |
| struct writeback_control *wbc); |
| |
| int (*writepage_start_hook)(struct page *page, u64 start, u64 end); |
| void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end, |
| struct extent_state *state, int uptodate); |
| void (*set_bit_hook)(void *private_data, struct extent_state *state, |
| unsigned *bits); |
| void (*clear_bit_hook)(void *private_data, |
| struct extent_state *state, |
| unsigned *bits); |
| void (*merge_extent_hook)(void *private_data, |
| struct extent_state *new, |
| struct extent_state *other); |
| void (*split_extent_hook)(void *private_data, |
| struct extent_state *orig, u64 split); |
| void (*check_extent_io_range)(void *private_data, const char *caller, |
| u64 start, u64 end); |
| }; |
| |
| struct extent_io_tree { |
| struct rb_root state; |
| void *private_data; |
| u64 dirty_bytes; |
| int track_uptodate; |
| spinlock_t lock; |
| const struct extent_io_ops *ops; |
| }; |
| |
| struct extent_state { |
| u64 start; |
| u64 end; /* inclusive */ |
| struct rb_node rb_node; |
| |
| /* ADD NEW ELEMENTS AFTER THIS */ |
| wait_queue_head_t wq; |
| refcount_t refs; |
| unsigned state; |
| |
| struct io_failure_record *failrec; |
| |
| #ifdef CONFIG_BTRFS_DEBUG |
| struct list_head leak_list; |
| #endif |
| }; |
| |
| #define INLINE_EXTENT_BUFFER_PAGES 16 |
| #define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE) |
| struct extent_buffer { |
| u64 start; |
| unsigned long len; |
| unsigned long bflags; |
| struct btrfs_fs_info *fs_info; |
| spinlock_t refs_lock; |
| atomic_t refs; |
| atomic_t io_pages; |
| int read_mirror; |
| struct rcu_head rcu_head; |
| pid_t lock_owner; |
| |
| /* count of read lock holders on the extent buffer */ |
| atomic_t write_locks; |
| atomic_t read_locks; |
| atomic_t blocking_writers; |
| atomic_t blocking_readers; |
| atomic_t spinning_readers; |
| atomic_t spinning_writers; |
| short lock_nested; |
| /* >= 0 if eb belongs to a log tree, -1 otherwise */ |
| short log_index; |
| |
| /* protects write locks */ |
| rwlock_t lock; |
| |
| /* readers use lock_wq while they wait for the write |
| * lock holders to unlock |
| */ |
| wait_queue_head_t write_lock_wq; |
| |
| /* writers use read_lock_wq while they wait for readers |
| * to unlock |
| */ |
| wait_queue_head_t read_lock_wq; |
| struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; |
| #ifdef CONFIG_BTRFS_DEBUG |
| struct list_head leak_list; |
| #endif |
| }; |
| |
| /* |
| * Structure to record how many bytes and which ranges are set/cleared |
| */ |
| struct extent_changeset { |
| /* How many bytes are set/cleared in this operation */ |
| unsigned int bytes_changed; |
| |
| /* Changed ranges */ |
| struct ulist range_changed; |
| }; |
| |
| static inline void extent_changeset_init(struct extent_changeset *changeset) |
| { |
| changeset->bytes_changed = 0; |
| ulist_init(&changeset->range_changed); |
| } |
| |
| static inline struct extent_changeset *extent_changeset_alloc(void) |
| { |
| struct extent_changeset *ret; |
| |
| ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
| if (!ret) |
| return NULL; |
| |
| extent_changeset_init(ret); |
| return ret; |
| } |
| |
| static inline void extent_changeset_release(struct extent_changeset *changeset) |
| { |
| if (!changeset) |
| return; |
| changeset->bytes_changed = 0; |
| ulist_release(&changeset->range_changed); |
| } |
| |
| static inline void extent_changeset_free(struct extent_changeset *changeset) |
| { |
| if (!changeset) |
| return; |
| extent_changeset_release(changeset); |
| kfree(changeset); |
| } |
| |
| static inline void extent_set_compress_type(unsigned long *bio_flags, |
| int compress_type) |
| { |
| *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; |
| } |
| |
| static inline int extent_compress_type(unsigned long bio_flags) |
| { |
| return bio_flags >> EXTENT_BIO_FLAG_SHIFT; |
| } |
| |
| struct extent_map_tree; |
| |
| typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, |
| struct page *page, |
| size_t pg_offset, |
| u64 start, u64 len, |
| int create); |
| |
| void extent_io_tree_init(struct extent_io_tree *tree, void *private_data); |
| int try_release_extent_mapping(struct extent_map_tree *map, |
| struct extent_io_tree *tree, struct page *page, |
| gfp_t mask); |
| int try_release_extent_buffer(struct page *page); |
| int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| struct extent_state **cached); |
| |
| static inline int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
| { |
| return lock_extent_bits(tree, start, end, NULL); |
| } |
| |
| int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end); |
| int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
| get_extent_t *get_extent, int mirror_num); |
| int __init extent_io_init(void); |
| void __cold extent_io_exit(void); |
| |
| u64 count_range_bits(struct extent_io_tree *tree, |
| u64 *start, u64 search_end, |
| u64 max_bytes, unsigned bits, int contig); |
| |
| void free_extent_state(struct extent_state *state); |
| int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, int filled, |
| struct extent_state *cached_state); |
| int clear_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, struct extent_changeset *changeset); |
| int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, int wake, int delete, |
| struct extent_state **cached); |
| int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, int wake, int delete, |
| struct extent_state **cached, gfp_t mask, |
| struct extent_changeset *changeset); |
| |
| static inline int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
| { |
| return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL); |
| } |
| |
| static inline int unlock_extent_cached(struct extent_io_tree *tree, u64 start, |
| u64 end, struct extent_state **cached) |
| { |
| return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, |
| GFP_NOFS, NULL); |
| } |
| |
| static inline int unlock_extent_cached_atomic(struct extent_io_tree *tree, |
| u64 start, u64 end, struct extent_state **cached) |
| { |
| return __clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, |
| GFP_ATOMIC, NULL); |
| } |
| |
| static inline int clear_extent_bits(struct extent_io_tree *tree, u64 start, |
| u64 end, unsigned bits) |
| { |
| int wake = 0; |
| |
| if (bits & EXTENT_LOCKED) |
| wake = 1; |
| |
| return clear_extent_bit(tree, start, end, bits, wake, 0, NULL); |
| } |
| |
| int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, struct extent_changeset *changeset); |
| int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, u64 *failed_start, |
| struct extent_state **cached_state, gfp_t mask); |
| |
| static inline int set_extent_bits(struct extent_io_tree *tree, u64 start, |
| u64 end, unsigned bits) |
| { |
| return set_extent_bit(tree, start, end, bits, NULL, NULL, GFP_NOFS); |
| } |
| |
| static inline int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, |
| u64 end, struct extent_state **cached_state) |
| { |
| return __clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
| cached_state, GFP_NOFS, NULL); |
| } |
| |
| static inline int set_extent_dirty(struct extent_io_tree *tree, u64 start, |
| u64 end, gfp_t mask) |
| { |
| return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
| NULL, mask); |
| } |
| |
| static inline int clear_extent_dirty(struct extent_io_tree *tree, u64 start, |
| u64 end) |
| { |
| return clear_extent_bit(tree, start, end, |
| EXTENT_DIRTY | EXTENT_DELALLOC | |
| EXTENT_DO_ACCOUNTING, 0, 0, NULL); |
| } |
| |
| int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
| unsigned bits, unsigned clear_bits, |
| struct extent_state **cached_state); |
| |
| static inline int set_extent_delalloc(struct extent_io_tree *tree, u64 start, |
| u64 end, unsigned int extra_bits, |
| struct extent_state **cached_state) |
| { |
| return set_extent_bit(tree, start, end, |
| EXTENT_DELALLOC | EXTENT_UPTODATE | extra_bits, |
| NULL, cached_state, GFP_NOFS); |
| } |
| |
| static inline int set_extent_defrag(struct extent_io_tree *tree, u64 start, |
| u64 end, struct extent_state **cached_state) |
| { |
| return set_extent_bit(tree, start, end, |
| EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, |
| NULL, cached_state, GFP_NOFS); |
| } |
| |
| static inline int set_extent_new(struct extent_io_tree *tree, u64 start, |
| u64 end) |
| { |
| return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, NULL, |
| GFP_NOFS); |
| } |
| |
| static inline int set_extent_uptodate(struct extent_io_tree *tree, u64 start, |
| u64 end, struct extent_state **cached_state, gfp_t mask) |
| { |
| return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
| cached_state, mask); |
| } |
| |
| int find_first_extent_bit(struct extent_io_tree *tree, u64 start, |
| u64 *start_ret, u64 *end_ret, unsigned bits, |
| struct extent_state **cached_state); |
| int extent_invalidatepage(struct extent_io_tree *tree, |
| struct page *page, unsigned long offset); |
| int extent_write_full_page(struct page *page, struct writeback_control *wbc); |
| int extent_write_locked_range(struct inode *inode, u64 start, u64 end, |
| int mode); |
| int extent_writepages(struct extent_io_tree *tree, |
| struct address_space *mapping, |
| struct writeback_control *wbc); |
| int btree_write_cache_pages(struct address_space *mapping, |
| struct writeback_control *wbc); |
| int extent_readpages(struct extent_io_tree *tree, |
| struct address_space *mapping, |
| struct list_head *pages, unsigned nr_pages); |
| int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| __u64 start, __u64 len); |
| void set_page_extent_mapped(struct page *page); |
| |
| struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
| u64 start); |
| struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
| u64 start, unsigned long len); |
| struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
| u64 start); |
| struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src); |
| struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
| u64 start); |
| void free_extent_buffer(struct extent_buffer *eb); |
| void free_extent_buffer_stale(struct extent_buffer *eb); |
| #define WAIT_NONE 0 |
| #define WAIT_COMPLETE 1 |
| #define WAIT_PAGE_LOCK 2 |
| int read_extent_buffer_pages(struct extent_io_tree *tree, |
| struct extent_buffer *eb, int wait, |
| int mirror_num); |
| void wait_on_extent_buffer_writeback(struct extent_buffer *eb); |
| |
| static inline unsigned long num_extent_pages(u64 start, u64 len) |
| { |
| return ((start + len + PAGE_SIZE - 1) >> PAGE_SHIFT) - |
| (start >> PAGE_SHIFT); |
| } |
| |
| static inline void extent_buffer_get(struct extent_buffer *eb) |
| { |
| atomic_inc(&eb->refs); |
| } |
| |
| static inline int extent_buffer_uptodate(struct extent_buffer *eb) |
| { |
| return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
| } |
| |
| int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
| unsigned long start, unsigned long len); |
| void read_extent_buffer(const struct extent_buffer *eb, void *dst, |
| unsigned long start, |
| unsigned long len); |
| int read_extent_buffer_to_user(const struct extent_buffer *eb, |
| void __user *dst, unsigned long start, |
| unsigned long len); |
| void write_extent_buffer_fsid(struct extent_buffer *eb, const void *src); |
| void write_extent_buffer_chunk_tree_uuid(struct extent_buffer *eb, |
| const void *src); |
| void write_extent_buffer(struct extent_buffer *eb, const void *src, |
| unsigned long start, unsigned long len); |
| void copy_extent_buffer_full(struct extent_buffer *dst, |
| struct extent_buffer *src); |
| void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, |
| unsigned long dst_offset, unsigned long src_offset, |
| unsigned long len); |
| void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, |
| unsigned long src_offset, unsigned long len); |
| void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, |
| unsigned long src_offset, unsigned long len); |
| void memzero_extent_buffer(struct extent_buffer *eb, unsigned long start, |
| unsigned long len); |
| int extent_buffer_test_bit(struct extent_buffer *eb, unsigned long start, |
| unsigned long pos); |
| void extent_buffer_bitmap_set(struct extent_buffer *eb, unsigned long start, |
| unsigned long pos, unsigned long len); |
| void extent_buffer_bitmap_clear(struct extent_buffer *eb, unsigned long start, |
| unsigned long pos, unsigned long len); |
| void clear_extent_buffer_dirty(struct extent_buffer *eb); |
| int set_extent_buffer_dirty(struct extent_buffer *eb); |
| void set_extent_buffer_uptodate(struct extent_buffer *eb); |
| void clear_extent_buffer_uptodate(struct extent_buffer *eb); |
| int extent_buffer_under_io(struct extent_buffer *eb); |
| int map_private_extent_buffer(const struct extent_buffer *eb, |
| unsigned long offset, unsigned long min_len, |
| char **map, unsigned long *map_start, |
| unsigned long *map_len); |
| void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); |
| void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); |
| void extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, |
| u64 delalloc_end, struct page *locked_page, |
| unsigned bits_to_clear, |
| unsigned long page_ops); |
| struct bio *btrfs_bio_alloc(struct block_device *bdev, u64 first_byte); |
| struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs); |
| struct bio *btrfs_bio_clone(struct bio *bio); |
| struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size); |
| |
| struct btrfs_fs_info; |
| struct btrfs_inode; |
| |
| int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
| u64 length, u64 logical, struct page *page, |
| unsigned int pg_offset, int mirror_num); |
| int clean_io_failure(struct btrfs_fs_info *fs_info, |
| struct extent_io_tree *failure_tree, |
| struct extent_io_tree *io_tree, u64 start, |
| struct page *page, u64 ino, unsigned int pg_offset); |
| void end_extent_writepage(struct page *page, int err, u64 start, u64 end); |
| int repair_eb_io_failure(struct btrfs_fs_info *fs_info, |
| struct extent_buffer *eb, int mirror_num); |
| |
| /* |
| * When IO fails, either with EIO or csum verification fails, we |
| * try other mirrors that might have a good copy of the data. This |
| * io_failure_record is used to record state as we go through all the |
| * mirrors. If another mirror has good data, the page is set up to date |
| * and things continue. If a good mirror can't be found, the original |
| * bio end_io callback is called to indicate things have failed. |
| */ |
| struct io_failure_record { |
| struct page *page; |
| u64 start; |
| u64 len; |
| u64 logical; |
| unsigned long bio_flags; |
| int this_mirror; |
| int failed_mirror; |
| int in_validation; |
| }; |
| |
| |
| void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, |
| u64 end); |
| int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, |
| struct io_failure_record **failrec_ret); |
| bool btrfs_check_repairable(struct inode *inode, unsigned failed_bio_pages, |
| struct io_failure_record *failrec, int fail_mirror); |
| struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, |
| struct io_failure_record *failrec, |
| struct page *page, int pg_offset, int icsum, |
| bio_end_io_t *endio_func, void *data); |
| int free_io_failure(struct extent_io_tree *failure_tree, |
| struct extent_io_tree *io_tree, |
| struct io_failure_record *rec); |
| #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
| noinline u64 find_lock_delalloc_range(struct inode *inode, |
| struct extent_io_tree *tree, |
| struct page *locked_page, u64 *start, |
| u64 *end, u64 max_bytes); |
| #endif |
| struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, |
| u64 start); |
| #endif |