Btrfs: add snapshot/subvolume destroy ioctl
This patch adds snapshot/subvolume destroy ioctl. A subvolume that isn't being
used and doesn't contains links to other subvolumes can be destroyed.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 8fc92298..4bd04f3 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5463,9 +5463,24 @@
ret = btrfs_del_root(trans, tree_root, &root->root_key);
BUG_ON(ret);
- free_extent_buffer(root->node);
- free_extent_buffer(root->commit_root);
- kfree(root);
+ if (root->root_key.objectid != BTRFS_TREE_RELOC_OBJECTID) {
+ ret = btrfs_find_last_root(tree_root, root->root_key.objectid,
+ NULL, NULL);
+ BUG_ON(ret < 0);
+ if (ret > 0) {
+ ret = btrfs_del_orphan_item(trans, tree_root,
+ root->root_key.objectid);
+ BUG_ON(ret);
+ }
+ }
+
+ if (root->in_radix) {
+ btrfs_free_fs_root(tree_root->fs_info, root);
+ } else {
+ free_extent_buffer(root->node);
+ free_extent_buffer(root->commit_root);
+ kfree(root);
+ }
out:
btrfs_end_transaction(trans, tree_root);
kfree(wc);
