Re: [PATCH v6] Stop periodic syncing if filesystem is already shutdown.

[Carlos Maiolino <cmaiolino@redhat.com>]

On Fri, Sep 21, 2012 at 10:24:04AM +0530, raghu.prabhu13@gmail.com wrote:
> From: Raghavendra D Prabhu <rprabhu@wnohang.net>
> 
> This is to prevent xfs_log_force from printing error message continuously (due
> to xfs_sync and others) till umount if the disk has been forcefully unplugged.
> 
> This is to prevent messages like these from being displayed repeatedly.
> 
> [ 3873.009329] XFS (sdb3): xfs_log_force: error 5 returned.
> 
> Note, that even after xfs_do_force_shutdown has been called, xfs_log_force
> doesn't stop till the filesystem has been unmounted (and it keeps printing
> "error 5 returned" to kernel log).
> 
> To fix this, added condition over XFS_FORCED_SHUTDOWN to xfs_log_force and
> xfs_fs_sync_fs.
> 
> To simulate it, mount an xfs filesystem located on external disk, and then pull
> the power to the disk.
> 
> Now, the dmesg looks,
> 
> [  268.307303] XFS (sdb2): xfs_do_force_shutdown(0x1) called from line 1031 of file fs/xfs/xfs_buf.c.  Return address = 0xffffffff8127c13a
> [  268.307318] XFS (sdb2): I/O Error Detected. Shutting down filesystem
> [  268.307323] XFS (sdb2): Please umount the filesystem and rectify the problem(s)
> 
> Version 1: Removed calling xfs_syncd_stop from xfs_sync_worker.
> Version 2: Removed calling xfs_fs_writable in xfs_sync_worker and xfs_flush_worker.
> Version 3: Removed calling xfs_syncd_stop in xfs_bwrite.
> Version 4: Added return statements to xfs_log_force and xfs_fs_sync_fs.
> Version 5: As per suggestion, removed EIO return in xfs_log_force.
> 
> Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
> ---
>  fs/xfs/xfs_log.c   | 5 ++++-
>  fs/xfs/xfs_super.c | 4 ++++
>  2 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
> index 7f4f937..161c925 100644
> --- a/fs/xfs/xfs_log.c
> +++ b/fs/xfs/xfs_log.c
> @@ -3002,7 +3002,10 @@ xfs_log_force(
>  
>  	trace_xfs_log_force(mp, 0);
>  	error = _xfs_log_force(mp, flags, NULL);
> -	if (error)
> +	/*
> +	 * Avoid warning when the filesystem has already shutdown.
> +	 */
> +	if (error && !XFS_FORCED_SHUTDOWN(mp))
>  		xfs_warn(mp, "%s: error %d returned.", __func__, error);
>  }
>  
> diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> index 19e2380..8df3387 100644
> --- a/fs/xfs/xfs_super.c
> +++ b/fs/xfs/xfs_super.c
> @@ -944,6 +944,10 @@ xfs_fs_sync_fs(
>  	if (!wait)
>  		return 0;
>  
> +	if (XFS_FORCED_SHUTDOWN(mp)) {
> +		return XFS_ERROR(EIO);
> +	}
> +
>  	error = xfs_quiesce_data(mp);
>  	if (error)
>  		return -error;
> -- 
> 1.7.12.1
> 
Looks good to me.

Reviewd-by: Carlos Maiolino <cmaiolino@redhat.com>

-- 
--Carlos

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