/* 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 <linux/btrfs_tree.h> #include <linux/spinlock.h> #include <linux/atomic.h> #include <linux/rwsem.h> #include <linux/list.h> #include <linux/slab.h> #include "compression.h" #include "messages.h" #include "ulist.h" #include "misc.h" struct page; struct file; struct folio; struct inode; struct fiemap_extent_info; struct readahead_control; struct address_space; struct writeback_control; struct extent_io_tree; struct extent_map_tree; struct extent_state; struct btrfs_block_group; struct btrfs_fs_info; struct btrfs_inode; struct btrfs_root; struct btrfs_trans_handle; struct btrfs_tree_parent_check; enum { … }; /* these are flags for __process_pages_contig */ enum { … }; /* * Folio private values. Every page that is controlled by the extent map has * folio private set to this value. */ #define EXTENT_FOLIO_PRIVATE … /* * 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) … #define BYTE_MASK … #define BITMAP_FIRST_BYTE_MASK(start) … #define BITMAP_LAST_BYTE_MASK(nbits) … int __init extent_buffer_init_cachep(void); void __cold extent_buffer_free_cachep(void); #define INLINE_EXTENT_BUFFER_PAGES … struct extent_buffer { … }; struct btrfs_eb_write_context { … }; static inline unsigned long offset_in_eb_folio(const struct extent_buffer *eb, u64 start) { … } /* * Get the correct offset inside the page of extent buffer. * * @eb: target extent buffer * @start: offset inside the extent buffer * * Will handle both sectorsize == PAGE_SIZE and sectorsize < PAGE_SIZE cases. */ static inline size_t get_eb_offset_in_folio(const struct extent_buffer *eb, unsigned long offset) { … } static inline unsigned long get_eb_folio_index(const struct extent_buffer *eb, unsigned long offset) { … } /* * Structure to record how many bytes and which ranges are set/cleared */ struct extent_changeset { … }; static inline void extent_changeset_init(struct extent_changeset *changeset) { … } static inline struct extent_changeset *extent_changeset_alloc(void) { … } static inline void extent_changeset_prealloc(struct extent_changeset *changeset, gfp_t gfp_mask) { … } static inline void extent_changeset_release(struct extent_changeset *changeset) { … } static inline void extent_changeset_free(struct extent_changeset *changeset) { … } bool try_release_extent_mapping(struct page *page, gfp_t mask); int try_release_extent_buffer(struct page *page); int btrfs_read_folio(struct file *file, struct folio *folio); void extent_write_locked_range(struct inode *inode, const struct page *locked_page, u64 start, u64 end, struct writeback_control *wbc, bool pages_dirty); int btrfs_writepages(struct address_space *mapping, struct writeback_control *wbc); int btree_write_cache_pages(struct address_space *mapping, struct writeback_control *wbc); void btrfs_readahead(struct readahead_control *rac); int set_folio_extent_mapped(struct folio *folio); int set_page_extent_mapped(struct page *page); void clear_page_extent_mapped(struct page *page); struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, u64 owner_root, int level); 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 … #define WAIT_COMPLETE … #define WAIT_PAGE_LOCK … int read_extent_buffer_pages(struct extent_buffer *eb, int wait, int mirror_num, const struct btrfs_tree_parent_check *parent_check); void wait_on_extent_buffer_writeback(struct extent_buffer *eb); void btrfs_readahead_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr, u64 owner_root, u64 gen, int level); void btrfs_readahead_node_child(struct extent_buffer *node, int slot); static inline int num_extent_pages(const struct extent_buffer *eb) { … } /* * This can only be determined at runtime by checking eb::folios[0]. * * As we can have either one large folio covering the whole eb * (either nodesize <= PAGE_SIZE, or high order folio), or multiple * single-paged folios. */ static inline int num_extent_folios(const struct extent_buffer *eb) { … } static inline int extent_buffer_uptodate(const struct extent_buffer *eb) { … } 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(const struct extent_buffer *eb, const void *src, unsigned long start, unsigned long len); static inline void write_extent_buffer_chunk_tree_uuid( const struct extent_buffer *eb, const void *chunk_tree_uuid) { … } static inline void write_extent_buffer_fsid(const struct extent_buffer *eb, const void *fsid) { … } 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 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); void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end, const struct page *locked_page, struct extent_state **cached, u32 bits_to_clear, unsigned long page_ops); int extent_invalidate_folio(struct extent_io_tree *tree, struct folio *folio, size_t offset); void btrfs_clear_buffer_dirty(struct btrfs_trans_handle *trans, struct extent_buffer *buf); int btrfs_alloc_page_array(unsigned int nr_pages, struct page **page_array, bool nofail); int btrfs_alloc_folio_array(unsigned int nr_folios, struct folio **folio_array); #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 … #endif #endif
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