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| author | Chris Mason <chris.mason@oracle.com> | 2008-11-18 03:14:24 +0100 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2008-11-18 03:14:24 +0100 |
| commit | ea9e8b11bd1252dcbc23afefcf1a52ec6aa3c113 (patch) | |
| tree | 3573c8d79e1936e8c921a3be77abda35124e0d78 /fs/btrfs/ctree.h | |
| parent | Btrfs: Add backrefs and forward refs for subvols and snapshots (diff) | |
| download | linux-ea9e8b11bd1252dcbc23afefcf1a52ec6aa3c113.tar.xz linux-ea9e8b11bd1252dcbc23afefcf1a52ec6aa3c113.zip | |
Btrfs: prevent loops in the directory tree when creating snapshots
For a directory tree:
/mnt/subvolA/subvolB
btrfsctl -s /mnt/subvolA/subvolB /mnt
Will create a directory loop with subvolA under subvolB. This
commit uses the forward refs for each subvol and snapshot to error out
before creating the loop.
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, 3 insertions, 0 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index ad2cbe63503c..70b3dbb4de12 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1801,6 +1801,9 @@ int btrfs_drop_subtree(struct btrfs_trans_handle *trans, struct extent_buffer *node, struct extent_buffer *parent); /* root-item.c */ +int btrfs_find_root_ref(struct btrfs_root *tree_root, + struct btrfs_path *path, + u64 root_id, u64 ref_id); int btrfs_add_root_ref(struct btrfs_trans_handle *trans, struct btrfs_root *tree_root, u64 root_id, u8 type, u64 ref_id, |