Commit 1690dd41 authored Dec 12, 2018 by Johannes Thumshirn Committed by David Sterba Dec 17, 2018

btrfs: improve error handling of btrfs_add_link



In the error handling block, err holds the return value of either
btrfs_del_root_ref() or btrfs_del_inode_ref() but it hasn't been checked
since it's introduction with commit fe66a05a (Btrfs: improve error
handling for btrfs_insert_dir_item callers) in 2012.

If the error handling in the error handling fails, there's not much left
to do and the abort either happened earlier in the callees or is
necessary here.

So if one of btrfs_del_root_ref() or btrfs_del_inode_ref() failed, abort
the transaction, but still return the original code of the failure
stored in 'ret' as this will be reported to the user.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

parent 34a28e3d

fs/btrfs/inode.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -6359,14 +6359,19 @@ int btrfs_add_link(struct btrfs_trans_handle *trans,
		err = btrfs_del_root_ref(trans, key.objectid,
		root->root_key.objectid, parent_ino,
		&local_index, name, name_len);

		if (err)
		btrfs_abort_transaction(trans, err);
		} else if (add_backref) {
		u64 local_index;
		int err;

		err = btrfs_del_inode_ref(trans, root, name, name_len,
		ino, parent_ino, &local_index);
		if (err)
		btrfs_abort_transaction(trans, err);
		}

		/* Return the original error code */
		return ret;
		}