[PATCH 09/11] xfs: use xfs_ilock_attr_map_shared in xfs_attr_get

[Dave Chinner]

On Fri, Dec 06, 2013 at 12:30:15PM -0800, Christoph Hellwig wrote:
> We might not have read in the extent list at this point, so make sure we
> take the ilock exclusively if we have to do so.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> 
> Index: xfs/fs/xfs/xfs_attr.c
> ===================================================================
> --- xfs.orig/fs/xfs/xfs_attr.c	2013-12-06 17:20:27.447331601 +0100
> +++ xfs/fs/xfs/xfs_attr.c	2013-12-06 19:41:05.119158446 +0100
> @@ -164,6 +164,7 @@ xfs_attr_get(
>  {
>  	int		error;
>  	struct xfs_name	xname;
> +	uint		lock_mode;
>  
>  	XFS_STATS_INC(xs_attr_get);
>  
> @@ -174,9 +175,9 @@ xfs_attr_get(
>  	if (error)
>  		return error;
>  
> -	xfs_ilock(ip, XFS_ILOCK_SHARED);
> +	lock_mode = xfs_ilock_attr_map_shared(ip);
>  	error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
> -	xfs_iunlock(ip, XFS_ILOCK_SHARED);
> +	xfs_iunlock(ip, lock_mode);
>  	return(error);
>  }

Yup, that should fix the assert problem. :)

Reviewed-by: Dave Chinner <dchinner at redhat.com>

-- 
Dave Chinner
david at fromorbit.com