181 lines
6.4 KiB
C
181 lines
6.4 KiB
C
#ifndef __EXTENTMAP__
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#define __EXTENTMAP__
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#include <linux/rbtree.h>
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#define EXTENT_MAP_HOLE (u64)-3
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#define EXTENT_MAP_INLINE (u64)-2
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#define EXTENT_MAP_DELALLOC (u64)-1
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/* bits for the extent state */
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#define EXTENT_DIRTY 1
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#define EXTENT_WRITEBACK (1 << 1)
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#define EXTENT_UPTODATE (1 << 2)
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#define EXTENT_LOCKED (1 << 3)
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#define EXTENT_NEW (1 << 4)
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#define EXTENT_DELALLOC (1 << 5)
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#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
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struct extent_map_ops {
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int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
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int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
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int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
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int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
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void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
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};
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struct extent_map_tree {
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struct rb_root map;
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struct rb_root state;
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struct address_space *mapping;
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rwlock_t lock;
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struct extent_map_ops *ops;
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};
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/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
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struct extent_map {
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u64 start;
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u64 end; /* inclusive */
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int in_tree;
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struct rb_node rb_node;
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/* block_start and block_end are in bytes */
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u64 block_start;
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u64 block_end; /* inclusive */
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struct block_device *bdev;
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atomic_t refs;
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};
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/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
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struct extent_state {
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u64 start;
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u64 end; /* inclusive */
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int in_tree;
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struct rb_node rb_node;
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wait_queue_head_t wq;
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atomic_t refs;
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unsigned long state;
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/* for use by the FS */
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u64 private;
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struct list_head list;
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};
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#define EXTENT_BUFFER_SIZE(nr) (sizeof(struct extent_buffer) + \
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(nr - 1) * sizeof(struct page *))
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struct extent_buffer {
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u64 start;
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unsigned long len;
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atomic_t refs;
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int flags;
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struct page *pages[];
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};
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typedef struct extent_map *(get_extent_t)(struct inode *inode,
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struct page *page,
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size_t page_offset,
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u64 start, u64 end,
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int create);
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void extent_map_tree_init(struct extent_map_tree *tree,
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struct address_space *mapping, gfp_t mask);
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struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
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u64 start, u64 end);
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int add_extent_mapping(struct extent_map_tree *tree,
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struct extent_map *em);
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int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
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int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
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int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
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int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
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struct extent_map *alloc_extent_map(gfp_t mask);
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void free_extent_map(struct extent_map *em);
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int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
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get_extent_t *get_extent);
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void __init extent_map_init(void);
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void __exit extent_map_exit(void);
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int extent_clean_all_trees(struct extent_map_tree *tree);
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int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
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gfp_t mask);
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int find_first_extent_bit(struct extent_map_tree *tree, u64 start,
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u64 *start_ret, u64 *end_ret, int bits);
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int extent_invalidatepage(struct extent_map_tree *tree,
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struct page *page, unsigned long offset);
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int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
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get_extent_t *get_extent,
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struct writeback_control *wbc);
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int extent_prepare_write(struct extent_map_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to, get_extent_t *get_extent);
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int extent_commit_write(struct extent_map_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to);
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sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
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get_extent_t *get_extent);
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int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
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int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
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int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
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void set_page_extent_mapped(struct page *page);
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struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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gfp_t mask);
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struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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gfp_t mask);
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void free_extent_buffer(struct extent_buffer *eb);
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int read_extent_buffer_pages(struct extent_map_tree *tree,
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struct extent_buffer *eb, int wait);
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static inline void extent_buffer_get(struct extent_buffer *eb)
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{
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atomic_inc(&eb->refs);
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}
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static inline u64 extent_buffer_blocknr(struct extent_buffer *eb)
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{
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return eb->start / 4096;
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}
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int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
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unsigned long start,
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unsigned long len);
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void read_extent_buffer(struct extent_buffer *eb, void *dst,
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unsigned long start,
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unsigned long len);
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void write_extent_buffer(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(struct extent_buffer *dst, 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(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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unsigned long src_offset, unsigned long len);
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void memset_extent_buffer(struct extent_buffer *eb, char c,
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unsigned long start, unsigned long len);
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int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int clear_extent_buffer_dirty(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int set_extent_buffer_dirty(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int set_extent_buffer_uptodate(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int extent_buffer_uptodate(struct extent_map_tree *tree,
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struct extent_buffer *eb);
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int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
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char **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km);
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void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
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#endif
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