#ifndef __EXTENTMAP__ #define __EXTENTMAP__ #include #define EXTENT_MAP_HOLE (u64)-3 #define EXTENT_MAP_INLINE (u64)-2 #define EXTENT_MAP_DELALLOC (u64)-1 /* bits for the extent state */ #define EXTENT_DIRTY 1 #define EXTENT_WRITEBACK (1 << 1) #define EXTENT_UPTODATE (1 << 2) #define EXTENT_LOCKED (1 << 3) #define EXTENT_NEW (1 << 4) #define EXTENT_DELALLOC (1 << 5) #define EXTENT_DEFRAG (1 << 6) #define EXTENT_DEFRAG_DONE (1 << 7) #define EXTENT_BUFFER_FILLED (1 << 8) #define EXTENT_CSUM (1 << 9) #define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK) /* * page->private values. Every page that is controlled by the extent * map has page->private set to one. */ #define EXTENT_PAGE_PRIVATE 1 #define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3 struct extent_map_ops { int (*fill_delalloc)(struct inode *inode, u64 start, u64 end); int (*writepage_io_hook)(struct page *page, u64 start, u64 end); int (*readpage_io_hook)(struct page *page, u64 start, u64 end); int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end); void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end); }; struct extent_map_tree { struct rb_root map; struct rb_root state; struct address_space *mapping; rwlock_t lock; struct extent_map_ops *ops; spinlock_t lru_lock; struct list_head buffer_lru; int lru_size; }; /* note, this must start with the same fields as fs/extent_map.c:tree_entry */ struct extent_map { u64 start; u64 end; /* inclusive */ int in_tree; struct rb_node rb_node; /* block_start and block_end are in bytes */ u64 block_start; u64 block_end; /* inclusive */ struct block_device *bdev; atomic_t refs; }; /* note, this must start with the same fields as fs/extent_map.c:tree_entry */ struct extent_state { u64 start; u64 end; /* inclusive */ int in_tree; struct rb_node rb_node; wait_queue_head_t wq; atomic_t refs; unsigned long state; /* for use by the FS */ u64 private; struct list_head list; }; struct extent_buffer { u64 start; unsigned long len; char *map_token; char *kaddr; unsigned long map_start; unsigned long map_len; struct page *first_page; struct list_head lru; atomic_t refs; int flags; }; typedef struct extent_map *(get_extent_t)(struct inode *inode, struct page *page, size_t page_offset, u64 start, u64 end, int create); void extent_map_tree_init(struct extent_map_tree *tree, struct address_space *mapping, gfp_t mask); void extent_map_tree_empty_lru(struct extent_map_tree *tree); struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree, u64 start, u64 end); int add_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em); int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page); int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); struct extent_map *alloc_extent_map(gfp_t mask); void free_extent_map(struct extent_map *em); int extent_read_full_page(struct extent_map_tree *tree, struct page *page, get_extent_t *get_extent); void __init extent_map_init(void); void __exit extent_map_exit(void); int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end, int bits, int filled); int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, int bits, gfp_t mask); int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end, int bits, gfp_t mask); int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask); int find_first_extent_bit(struct extent_map_tree *tree, u64 start, u64 *start_ret, u64 *end_ret, int bits); int extent_invalidatepage(struct extent_map_tree *tree, struct page *page, unsigned long offset); int extent_write_full_page(struct extent_map_tree *tree, struct page *page, get_extent_t *get_extent, struct writeback_control *wbc); int extent_writepages(struct extent_map_tree *tree, struct address_space *mapping, get_extent_t *get_extent, struct writeback_control *wbc); int extent_prepare_write(struct extent_map_tree *tree, struct inode *inode, struct page *page, unsigned from, unsigned to, get_extent_t *get_extent); int extent_commit_write(struct extent_map_tree *tree, struct inode *inode, struct page *page, unsigned from, unsigned to); sector_t extent_bmap(struct address_space *mapping, sector_t iblock, get_extent_t *get_extent); int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end); int set_state_private(struct extent_map_tree *tree, u64 start, u64 private); int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private); void set_page_extent_mapped(struct page *page); struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree, u64 start, unsigned long len, struct page *page0, gfp_t mask); struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree, u64 start, unsigned long len, gfp_t mask); void free_extent_buffer(struct extent_buffer *eb); int read_extent_buffer_pages(struct extent_map_tree *tree, struct extent_buffer *eb, u64 start, int wait); static inline void extent_buffer_get(struct extent_buffer *eb) { atomic_inc(&eb->refs); } int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, unsigned long start, unsigned long len); void read_extent_buffer(struct extent_buffer *eb, void *dst, unsigned long start, unsigned long len); void write_extent_buffer(struct extent_buffer *eb, const void *src, unsigned long start, unsigned long len); 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 memset_extent_buffer(struct extent_buffer *eb, char c, unsigned long start, unsigned long len); int wait_on_extent_buffer_writeback(struct extent_map_tree *tree, struct extent_buffer *eb); int clear_extent_buffer_dirty(struct extent_map_tree *tree, struct extent_buffer *eb); int set_extent_buffer_dirty(struct extent_map_tree *tree, struct extent_buffer *eb); int set_extent_buffer_uptodate(struct extent_map_tree *tree, struct extent_buffer *eb); int extent_buffer_uptodate(struct extent_map_tree *tree, struct extent_buffer *eb); int map_extent_buffer(struct extent_buffer *eb, unsigned long offset, unsigned long min_len, char **token, char **map, unsigned long *map_start, unsigned long *map_len, int km); int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset, unsigned long min_len, char **token, char **map, unsigned long *map_start, unsigned long *map_len, int km); void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km); #endif