Re: [PATCH] Btrfs: fix ordered extent leak when failing to start a transaction

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On Wed, Aug 22, 2012 at 11:13:25AM +0800, bo.li.liu@xxxxxxxxxx wrote:
> We cannot just return error before freeing ordered extent and releasing reserved
> space when we fail to start a transacion.
> 
> Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> ---
>  fs/btrfs/inode.c |    7 +++++--
>  1 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 7131fac..f6c43ff 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -1883,8 +1883,11 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
>  				trans = btrfs_join_transaction_nolock(root);
>  			else
>  				trans = btrfs_join_transaction(root);
> -			if (IS_ERR(trans))
> -				return PTR_ERR(trans);
> +			if (IS_ERR(trans)) {
> +				ret = PTR_ERR(trans);
> +				trans = NULL;
> +				goto out;
> +			}

The same code is used a few lines below (after locking the range) when
transaction fails, so I agree that this should be done here as well. Ack.


david
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