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| author | Yan Zheng <zheng.yan@oracle.com> | 2009-06-27 21:07:35 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-07-02 13:41:17 -0400 |
| commit | 2c47e605a91dde6b0514f689645e7ab336c8592a (patch) | |
| tree | d541e61440f06f37d17e2d14cbaa78fc0cd41ff2 /fs/btrfs/ctree.h | |
| parent | a970b0a16cc416a509d5ae8b1d70978664e6f4fe (diff) | |
| download | op-kernel-dev-2c47e605a91dde6b0514f689645e7ab336c8592a.zip op-kernel-dev-2c47e605a91dde6b0514f689645e7ab336c8592a.tar.gz | |
Btrfs: update backrefs while dropping snapshot
The new backref format has restriction on type of backref item. If a tree
block isn't referenced by its owner tree, full backrefs must be used for the
pointers in it. When a tree block loses its owner tree's reference, backrefs
for the pointers in it should be updated to full backrefs. Current
btrfs_drop_snapshot misses the code that updates backrefs, so it's unsafe for
general use.
This patch adds backrefs update code to btrfs_drop_snapshot. It isn't a
problem in the restricted form btrfs_drop_snapshot is used today, but for
general snapshot deletion this update is required.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
| -rw-r--r-- | fs/btrfs/ctree.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 03441a9..a404ecc 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2076,8 +2076,7 @@ static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path); int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path); int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf); -int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root - *root); +int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref); int btrfs_drop_subtree(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct extent_buffer *node, |
