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Btrfs: add leaf data casting helper

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-03-14 10:31:29 -04:00
committed by David Woodhouse
parent 710874947a
commit 4beb1b8b75
3 changed files with 8 additions and 9 deletions
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4
fs/btrfs/ctree.h
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@@ -401,6 +401,10 @@ static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
s->blocksize = cpu_to_le16(val);
}
/* helper function to cast into the data area of the leaf. */
#define btrfs_item_ptr(leaf, slot, type) \
((type *)((leaf)->data + btrfs_item_offset((leaf)->items + (slot))))
struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_root *root);
int btrfs_inc_ref(struct btrfs_root *root, struct btrfs_buffer *buf);
int btrfs_free_extent(struct btrfs_root *root, u64 blocknr, u64 num_blocks);