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329 lines
11 KiB
329 lines
11 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef BTRFS_EXTENT_IO_H |
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#define BTRFS_EXTENT_IO_H |
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#include <linux/rbtree.h> |
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#include <linux/refcount.h> |
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#include <linux/fiemap.h> |
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#include <linux/btrfs_tree.h> |
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#include "ulist.h" |
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/* |
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* flags for bio submission. The high bits indicate the compression |
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* type for this bio |
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*/ |
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#define EXTENT_BIO_COMPRESSED 1 |
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#define EXTENT_BIO_FLAG_SHIFT 16 |
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enum { |
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EXTENT_BUFFER_UPTODATE, |
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EXTENT_BUFFER_DIRTY, |
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EXTENT_BUFFER_CORRUPT, |
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/* this got triggered by readahead */ |
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EXTENT_BUFFER_READAHEAD, |
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EXTENT_BUFFER_TREE_REF, |
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EXTENT_BUFFER_STALE, |
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EXTENT_BUFFER_WRITEBACK, |
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/* read IO error */ |
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EXTENT_BUFFER_READ_ERR, |
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EXTENT_BUFFER_UNMAPPED, |
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EXTENT_BUFFER_IN_TREE, |
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/* write IO error */ |
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EXTENT_BUFFER_WRITE_ERR, |
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EXTENT_BUFFER_NO_CHECK, |
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}; |
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/* these are flags for __process_pages_contig */ |
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#define PAGE_UNLOCK (1 << 0) |
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/* Page starts writeback, clear dirty bit and set writeback bit */ |
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#define PAGE_START_WRITEBACK (1 << 1) |
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#define PAGE_END_WRITEBACK (1 << 2) |
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#define PAGE_SET_ORDERED (1 << 3) |
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#define PAGE_SET_ERROR (1 << 4) |
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#define PAGE_LOCK (1 << 5) |
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/* |
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* page->private values. Every page that is controlled by the extent |
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* map has page->private set to one. |
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*/ |
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#define EXTENT_PAGE_PRIVATE 1 |
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/* |
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* The extent buffer bitmap operations are done with byte granularity instead of |
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* word granularity for two reasons: |
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* 1. The bitmaps must be little-endian on disk. |
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* 2. Bitmap items are not guaranteed to be aligned to a word and therefore a |
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* single word in a bitmap may straddle two pages in the extent buffer. |
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*/ |
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#define BIT_BYTE(nr) ((nr) / BITS_PER_BYTE) |
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#define BYTE_MASK ((1 << BITS_PER_BYTE) - 1) |
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#define BITMAP_FIRST_BYTE_MASK(start) \ |
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((BYTE_MASK << ((start) & (BITS_PER_BYTE - 1))) & BYTE_MASK) |
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#define BITMAP_LAST_BYTE_MASK(nbits) \ |
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(BYTE_MASK >> (-(nbits) & (BITS_PER_BYTE - 1))) |
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struct btrfs_root; |
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struct btrfs_inode; |
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struct btrfs_io_bio; |
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struct btrfs_fs_info; |
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struct io_failure_record; |
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struct extent_io_tree; |
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typedef blk_status_t (submit_bio_hook_t)(struct inode *inode, struct bio *bio, |
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int mirror_num, |
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unsigned long bio_flags); |
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typedef blk_status_t (extent_submit_bio_start_t)(struct inode *inode, |
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struct bio *bio, u64 dio_file_offset); |
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#define INLINE_EXTENT_BUFFER_PAGES (BTRFS_MAX_METADATA_BLOCKSIZE / PAGE_SIZE) |
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struct extent_buffer { |
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u64 start; |
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unsigned long len; |
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unsigned long bflags; |
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struct btrfs_fs_info *fs_info; |
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spinlock_t refs_lock; |
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atomic_t refs; |
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atomic_t io_pages; |
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int read_mirror; |
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struct rcu_head rcu_head; |
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pid_t lock_owner; |
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/* >= 0 if eb belongs to a log tree, -1 otherwise */ |
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s8 log_index; |
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struct rw_semaphore lock; |
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struct page *pages[INLINE_EXTENT_BUFFER_PAGES]; |
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struct list_head release_list; |
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#ifdef CONFIG_BTRFS_DEBUG |
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struct list_head leak_list; |
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#endif |
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}; |
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/* |
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* Structure to record info about the bio being assembled, and other info like |
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* how many bytes are there before stripe/ordered extent boundary. |
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*/ |
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struct btrfs_bio_ctrl { |
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struct bio *bio; |
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unsigned long bio_flags; |
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u32 len_to_stripe_boundary; |
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u32 len_to_oe_boundary; |
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}; |
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/* |
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* Structure to record how many bytes and which ranges are set/cleared |
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*/ |
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struct extent_changeset { |
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/* How many bytes are set/cleared in this operation */ |
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unsigned int bytes_changed; |
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/* Changed ranges */ |
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struct ulist range_changed; |
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}; |
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static inline void extent_changeset_init(struct extent_changeset *changeset) |
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{ |
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changeset->bytes_changed = 0; |
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ulist_init(&changeset->range_changed); |
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} |
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static inline struct extent_changeset *extent_changeset_alloc(void) |
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{ |
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struct extent_changeset *ret; |
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ret = kmalloc(sizeof(*ret), GFP_KERNEL); |
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if (!ret) |
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return NULL; |
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extent_changeset_init(ret); |
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return ret; |
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} |
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static inline void extent_changeset_release(struct extent_changeset *changeset) |
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{ |
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if (!changeset) |
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return; |
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changeset->bytes_changed = 0; |
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ulist_release(&changeset->range_changed); |
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} |
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static inline void extent_changeset_free(struct extent_changeset *changeset) |
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{ |
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if (!changeset) |
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return; |
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extent_changeset_release(changeset); |
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kfree(changeset); |
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} |
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static inline void extent_set_compress_type(unsigned long *bio_flags, |
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int compress_type) |
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{ |
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*bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT; |
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} |
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static inline int extent_compress_type(unsigned long bio_flags) |
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{ |
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return bio_flags >> EXTENT_BIO_FLAG_SHIFT; |
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} |
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struct extent_map_tree; |
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typedef struct extent_map *(get_extent_t)(struct btrfs_inode *inode, |
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struct page *page, size_t pg_offset, |
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u64 start, u64 len); |
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int try_release_extent_mapping(struct page *page, gfp_t mask); |
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int try_release_extent_buffer(struct page *page); |
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int __must_check submit_one_bio(struct bio *bio, int mirror_num, |
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unsigned long bio_flags); |
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int btrfs_do_readpage(struct page *page, struct extent_map **em_cached, |
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struct btrfs_bio_ctrl *bio_ctrl, |
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unsigned int read_flags, u64 *prev_em_start); |
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int extent_write_full_page(struct page *page, struct writeback_control *wbc); |
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int extent_write_locked_range(struct inode *inode, u64 start, u64 end, |
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int mode); |
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int extent_writepages(struct address_space *mapping, |
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struct writeback_control *wbc); |
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int btree_write_cache_pages(struct address_space *mapping, |
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struct writeback_control *wbc); |
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void extent_readahead(struct readahead_control *rac); |
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int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo, |
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u64 start, u64 len); |
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int set_page_extent_mapped(struct page *page); |
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void clear_page_extent_mapped(struct page *page); |
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struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
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u64 start, u64 owner_root, int level); |
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struct extent_buffer *__alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
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u64 start, unsigned long len); |
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struct extent_buffer *alloc_dummy_extent_buffer(struct btrfs_fs_info *fs_info, |
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u64 start); |
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struct extent_buffer *btrfs_clone_extent_buffer(const struct extent_buffer *src); |
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struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, |
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u64 start); |
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void free_extent_buffer(struct extent_buffer *eb); |
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void free_extent_buffer_stale(struct extent_buffer *eb); |
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#define WAIT_NONE 0 |
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#define WAIT_COMPLETE 1 |
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#define WAIT_PAGE_LOCK 2 |
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int read_extent_buffer_pages(struct extent_buffer *eb, int wait, |
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int mirror_num); |
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void wait_on_extent_buffer_writeback(struct extent_buffer *eb); |
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void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info, |
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u64 bytenr, u64 owner_root, u64 gen, int level); |
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void btrfs_readahead_node_child(struct extent_buffer *node, int slot); |
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static inline int num_extent_pages(const struct extent_buffer *eb) |
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{ |
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/* |
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* For sectorsize == PAGE_SIZE case, since nodesize is always aligned to |
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* sectorsize, it's just eb->len >> PAGE_SHIFT. |
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* |
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* For sectorsize < PAGE_SIZE case, we could have nodesize < PAGE_SIZE, |
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* thus have to ensure we get at least one page. |
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*/ |
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return (eb->len >> PAGE_SHIFT) ?: 1; |
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} |
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static inline int extent_buffer_uptodate(const struct extent_buffer *eb) |
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{ |
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return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
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} |
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int memcmp_extent_buffer(const struct extent_buffer *eb, const void *ptrv, |
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unsigned long start, unsigned long len); |
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void read_extent_buffer(const struct extent_buffer *eb, void *dst, |
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unsigned long start, |
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unsigned long len); |
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int read_extent_buffer_to_user_nofault(const struct extent_buffer *eb, |
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void __user *dst, unsigned long start, |
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unsigned long len); |
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void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *src); |
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void write_extent_buffer_chunk_tree_uuid(const struct extent_buffer *eb, |
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const void *src); |
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void write_extent_buffer(const struct extent_buffer *eb, const void *src, |
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unsigned long start, unsigned long len); |
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void copy_extent_buffer_full(const struct extent_buffer *dst, |
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const struct extent_buffer *src); |
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void copy_extent_buffer(const struct extent_buffer *dst, |
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const struct extent_buffer *src, |
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unsigned long dst_offset, unsigned long src_offset, |
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unsigned long len); |
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void memcpy_extent_buffer(const struct extent_buffer *dst, |
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unsigned long dst_offset, unsigned long src_offset, |
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unsigned long len); |
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void memmove_extent_buffer(const struct extent_buffer *dst, |
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unsigned long dst_offset, unsigned long src_offset, |
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unsigned long len); |
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void memzero_extent_buffer(const struct extent_buffer *eb, unsigned long start, |
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unsigned long len); |
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int extent_buffer_test_bit(const struct extent_buffer *eb, unsigned long start, |
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unsigned long pos); |
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void extent_buffer_bitmap_set(const struct extent_buffer *eb, unsigned long start, |
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unsigned long pos, unsigned long len); |
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void extent_buffer_bitmap_clear(const struct extent_buffer *eb, |
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unsigned long start, unsigned long pos, |
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unsigned long len); |
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void clear_extent_buffer_dirty(const struct extent_buffer *eb); |
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bool set_extent_buffer_dirty(struct extent_buffer *eb); |
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void set_extent_buffer_uptodate(struct extent_buffer *eb); |
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void clear_extent_buffer_uptodate(struct extent_buffer *eb); |
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int extent_buffer_under_io(const struct extent_buffer *eb); |
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void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end); |
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void extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end); |
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void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end, |
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struct page *locked_page, |
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u32 bits_to_clear, unsigned long page_ops); |
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struct bio *btrfs_bio_alloc(u64 first_byte); |
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struct bio *btrfs_io_bio_alloc(unsigned int nr_iovecs); |
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struct bio *btrfs_bio_clone(struct bio *bio); |
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struct bio *btrfs_bio_clone_partial(struct bio *orig, int offset, int size); |
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int repair_io_failure(struct btrfs_fs_info *fs_info, u64 ino, u64 start, |
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u64 length, u64 logical, struct page *page, |
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unsigned int pg_offset, int mirror_num); |
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void end_extent_writepage(struct page *page, int err, u64 start, u64 end); |
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int btrfs_repair_eb_io_failure(const struct extent_buffer *eb, int mirror_num); |
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/* |
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* When IO fails, either with EIO or csum verification fails, we |
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* try other mirrors that might have a good copy of the data. This |
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* io_failure_record is used to record state as we go through all the |
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* mirrors. If another mirror has good data, the sector is set up to date |
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* and things continue. If a good mirror can't be found, the original |
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* bio end_io callback is called to indicate things have failed. |
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*/ |
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struct io_failure_record { |
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struct page *page; |
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u64 start; |
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u64 len; |
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u64 logical; |
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unsigned long bio_flags; |
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int this_mirror; |
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int failed_mirror; |
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}; |
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int btrfs_repair_one_sector(struct inode *inode, |
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struct bio *failed_bio, u32 bio_offset, |
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struct page *page, unsigned int pgoff, |
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u64 start, int failed_mirror, |
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submit_bio_hook_t *submit_bio_hook); |
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS |
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bool find_lock_delalloc_range(struct inode *inode, |
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struct page *locked_page, u64 *start, |
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u64 *end); |
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#endif |
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struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, |
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u64 start); |
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#ifdef CONFIG_BTRFS_DEBUG |
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void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info); |
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#else |
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#define btrfs_extent_buffer_leak_debug_check(fs_info) do {} while (0) |
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#endif |
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#endif
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