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- /* SPDX-License-Identifier: GPL-2.0 */
- #ifndef BTRFS_EXTENT_IO_H
- #define BTRFS_EXTENT_IO_H
- #include <linux/rbtree.h>
- #include <linux/refcount.h>
- #include <linux/fiemap.h>
- #include "ulist.h"
- /*
- * 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
- enum {
- EXTENT_BUFFER_UPTODATE,
- EXTENT_BUFFER_DIRTY,
- EXTENT_BUFFER_CORRUPT,
- /* this got triggered by readahead */
- EXTENT_BUFFER_READAHEAD,
- EXTENT_BUFFER_TREE_REF,
- EXTENT_BUFFER_STALE,
- EXTENT_BUFFER_WRITEBACK,
- /* read IO error */
- EXTENT_BUFFER_READ_ERR,
- EXTENT_BUFFER_UNMAPPED,
- EXTENT_BUFFER_IN_TREE,
- /* write IO error */
- EXTENT_BUFFER_WRITE_ERR,
- };
- /* 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)))
- struct btrfs_root;
- struct btrfs_inode;
- struct btrfs_io_bio;
- struct io_failure_record;
- struct extent_io_tree;
- typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio,
- int mirror_num,
- unsigned long bio_flags);
- typedef blk_status_t (extent_submit_bio_start_t)(void *private_data,
- struct bio *bio, u64 bio_offset);
- #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;
- int blocking_writers;
- atomic_t blocking_readers;
- bool lock_recursed;
- /* >= 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
- int spinning_writers;
- atomic_t spinning_readers;
- atomic_t read_locks;
- int write_locks;
- 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 */
- u64 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 try_release_extent_mapping(struct page *page, gfp_t mask);
- int try_release_extent_buffer(struct page *page);
- int __must_check submit_one_bio(struct bio *bio, int mirror_num,
- unsigned long bio_flags);
- int btrfs_do_readpage(struct page *page, struct extent_map **em_cached,
- struct bio **bio, unsigned long *bio_flags,
- unsigned int read_flags, u64 *prev_em_start);
- 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 address_space *mapping,
- struct writeback_control *wbc);
- int btree_write_cache_pages(struct address_space *mapping,
- struct writeback_control *wbc);
- void extent_readahead(struct readahead_control *rac);
- int extent_fiemap(struct btrfs_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(const 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_buffer *eb, int wait,
- int mirror_num);
- void wait_on_extent_buffer_writeback(struct extent_buffer *eb);
- static inline int num_extent_pages(const struct extent_buffer *eb)
- {
- return (round_up(eb->start + eb->len, PAGE_SIZE) >> PAGE_SHIFT) -
- (eb->start >> PAGE_SHIFT);
- }
- static inline int extent_buffer_uptodate(const 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_nofault(const struct extent_buffer *eb,
- void __user *dst, unsigned long start,
- unsigned long len);
- void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src);
- void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb,
- const void *src);
- void write_extent_buffer(const struct extent_buffer *eb, const void *src,
- unsigned long start, unsigned long len);
- void copy_extent_buffer_full(const struct extent_buffer *dst,
- const struct extent_buffer *src);
- void copy_extent_buffer(const struct extent_buffer *dst,
- const struct extent_buffer *src,
- unsigned long dst_offset, unsigned long src_offset,
- unsigned long len);
- void memcpy_extent_buffer(const struct extent_buffer *dst,
- unsigned long dst_offset, unsigned long src_offset,
- unsigned long len);
- void memmove_extent_buffer(const struct extent_buffer *dst,
- unsigned long dst_offset, unsigned long src_offset,
- unsigned long len);
- void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start,
- unsigned long len);
- int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start,
- unsigned long pos);
- void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start,
- unsigned long pos, unsigned long len);
- void extent_buffer_bitmap_clear(const struct extent_buffer *eb,
- unsigned long start, unsigned long pos,
- unsigned long len);
- void clear_extent_buffer_dirty(const struct extent_buffer *eb);
- bool 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(const struct extent_buffer *eb);
- 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 btrfs_inode *inode, u64 start, u64 end,
- struct page *locked_page,
- unsigned bits_to_clear,
- unsigned long page_ops);
- struct bio *btrfs_bio_alloc(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);
- void end_extent_writepage(struct page *page, int err, u64 start, u64 end);
- int btrfs_repair_eb_io_failure(const 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;
- };
- blk_status_t btrfs_submit_read_repair(struct inode *inode,
- struct bio *failed_bio, u64 phy_offset,
- struct page *page, unsigned int pgoff,
- u64 start, u64 end, int failed_mirror,
- submit_bio_hook_t *submit_bio_hook);
- #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
- bool find_lock_delalloc_range(struct inode *inode,
- struct page *locked_page, u64 *start,
- u64 *end);
- #endif
- struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,
- u64 start);
- #ifdef CONFIG_BTRFS_DEBUG
- void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);
- #else
- #define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0)
- #endif
- #endif
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