btrfs: hold a ref on the root in merge_reloc_roots

We look up the corresponding root for the reloc root, we need to hold a ref while we're messing with it. Signed-off-by: Josef Bacik <[email protected]> Reviewed-by: David Sterba <[email protected]> Signed-off-by: David Sterba <[email protected]>
mrcsosa · Mar 23, 2020 · ab9737b · ab9737b
1 parent db2c2ca
commit ab9737b
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
@@ -2592,9 +2592,11 @@ void merge_reloc_roots(struct reloc_control *rc)
 			root = read_fs_root(fs_info,
 					    reloc_root->root_key.offset);
 			BUG_ON(IS_ERR(root));
+			BUG_ON(!btrfs_grab_fs_root(root));
 			BUG_ON(root->reloc_root != reloc_root);
 
 			ret = merge_reloc_root(rc, root);
+			btrfs_put_fs_root(root);
 			if (ret) {
 				if (list_empty(&reloc_root->root_list))
 					list_add_tail(&reloc_root->root_list,