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| author | Josef Bacik <jbacik@fusionio.com> | 2013-08-12 15:36:44 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2013-09-01 08:05:02 -0400 |
| commit | 175a2b871f46272a2aedce5fb3222a72568b84c3 (patch) | |
| tree | 17a101c9ff84cec0f2bbf184f44bd4f6858e92f3 /fs | |
| parent | a05254143cd183b18002cbba7759a1e4629aa762 (diff) | |
| download | linux-175a2b871f46272a2aedce5fb3222a72568b84c3.tar.gz | |
Btrfs: don't allow a subvol to be deleted if it is the default subovl
Eric pointed out that btrfs will happily allow you to delete the default subvol. This is a problem obviously since the next time you go to mount the file system it will freak out because it can't find the root. Fix this by adding a check to see if our default subvol points to the subvol we are trying to delete, and if it does not allowing it to happen. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/ioctl.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 022d8364e072..317a984fe3c9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1726,13 +1726,28 @@ out: static noinline int may_destroy_subvol(struct btrfs_root *root) { struct btrfs_path *path; + struct btrfs_dir_item *di; struct btrfs_key key; + u64 dir_id; int ret; path = btrfs_alloc_path(); if (!path) return -ENOMEM; + /* Make sure this root isn't set as the default subvol */ + dir_id = btrfs_super_root_dir(root->fs_info->super_copy); + di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, path, + dir_id, "default", 7, 0); + if (di && !IS_ERR(di)) { + btrfs_dir_item_key_to_cpu(path->nodes[0], di, &key); + if (key.objectid == root->root_key.objectid) { + ret = -ENOTEMPTY; + goto out; + } + btrfs_release_path(path); + } + key.objectid = root->root_key.objectid; key.type = BTRFS_ROOT_REF_KEY; key.offset = (u64)-1; |