Re: [PATCH v3 07/17] xfs: ratelimit unmount time per-buffer I/O error alert

["Darrick J. Wong" <darrick.wong@oracle.com>]

On Wed, Apr 29, 2020 at 01:21:43PM -0400, Brian Foster wrote:
> At unmount time, XFS emits an alert for every in-core buffer that
> might have undergone a write error. In practice this behavior is
> probably reasonable given that the filesystem is likely short lived
> once I/O errors begin to occur consistently. Under certain test or
> otherwise expected error conditions, this can spam the logs and slow
> down the unmount.
> 
> Now that we have a ratelimit mechanism specifically for buffer
> alerts, reuse it for the per-buffer alerts in xfs_wait_buftarg().
> Also lift the final repair message out of the loop so it always
> prints and assert that the metadata error handling code has shut
> down the fs.
> 
> Signed-off-by: Brian Foster <bfoster@redhat.com>

LOL, this question answered my question from the previous patch.

Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

--D

> ---
>  fs/xfs/xfs_buf.c | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
> index 594d5e1df6f8..8f0f605de579 100644
> --- a/fs/xfs/xfs_buf.c
> +++ b/fs/xfs/xfs_buf.c
> @@ -1657,7 +1657,8 @@ xfs_wait_buftarg(
>  	struct xfs_buftarg	*btp)
>  {
>  	LIST_HEAD(dispose);
> -	int loop = 0;
> +	int			loop = 0;
> +	bool			write_fail = false;
>  
>  	/*
>  	 * First wait on the buftarg I/O count for all in-flight buffers to be
> @@ -1685,17 +1686,23 @@ xfs_wait_buftarg(
>  			bp = list_first_entry(&dispose, struct xfs_buf, b_lru);
>  			list_del_init(&bp->b_lru);
>  			if (bp->b_flags & XBF_WRITE_FAIL) {
> -				xfs_alert(btp->bt_mount,
> +				write_fail = true;
> +				xfs_buf_alert_ratelimited(bp,
> +					"XFS: Corruption Alert",
>  "Corruption Alert: Buffer at daddr 0x%llx had permanent write failures!",
>  					(long long)bp->b_bn);
> -				xfs_alert(btp->bt_mount,
> -"Please run xfs_repair to determine the extent of the problem.");
>  			}
>  			xfs_buf_rele(bp);
>  		}
>  		if (loop++ != 0)
>  			delay(100);
>  	}
> +
> +	if (write_fail) {
> +		ASSERT(XFS_FORCED_SHUTDOWN(btp->bt_mount));
> +		xfs_alert(btp->bt_mount,
> +	      "Please run xfs_repair to determine the extent of the problem.");
> +	}
>  }
>  
>  static enum lru_status
> -- 
> 2.21.1
>