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Btrfs: [PATCH] extent_map: provide generic bmap

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generic_bmap is completely trivial, while the extent to bh mapping in
btrfs is rather complex.  So provide a extent_bmap instead that takes
a get_extent callback and can be used by filesystem using the extent_map
code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Christoph Hellwig
2007-09-10 20:02:30 -04:00
committed by David Woodhouse
parent 90f1c19a9f
commit d396c6f554
3 changed files with 23 additions and 21 deletions
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2
fs/btrfs/extent_map.h
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@@ -99,6 +99,8 @@ int extent_prepare_write(struct extent_map_tree *tree,
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);