Re: [PATCH 2/9] btrfs: clear defrag status of a root if starting transaction fails

[Qu Wenruo <quwenruo.btrfs@xxxxxxx>]

On 2021/5/26 上午1:08, David Sterba wrote:
> The defrag loop processes leaves in batches and starting transaction for
> each. The whole defragmentation on a given root is protected by a bit
> but in case the transaction fails, the bit is not cleared
>
> In case the transaction fails the bit would prevent starting
> defragmentation again, so make sure it's cleared.
>
> CC: stable@xxxxxxxxxxxxxxx # 4.4+
> Signed-off-by: David Sterba <dsterba@xxxxxxxx>

Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>

Thanks,
Qu
> ---
>   fs/btrfs/transaction.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
> index e0a82aa7da89..22951621363f 100644
> --- a/fs/btrfs/transaction.c
> +++ b/fs/btrfs/transaction.c
> @@ -1406,8 +1406,10 @@ int btrfs_defrag_root(struct btrfs_root *root)
>
>   	while (1) {
>   		trans = btrfs_start_transaction(root, 0);
> -		if (IS_ERR(trans))
> -			return PTR_ERR(trans);
> +		if (IS_ERR(trans)) {
> +			ret = PTR_ERR(trans);
> +			break;
> +		}
>
>   		ret = btrfs_defrag_leaves(trans, root);