[PATCH] xfs_db: fix unaligned accesses

[Bill O'Donnell]

On Fri, May 06, 2016 at 03:43:53PM -0500, Eric Sandeen wrote:
> Fix 2 unaligned accesses in xfs_db which caused bus errors on
> sparc64.  Similar treatment was already done in xfs_repair and
> xfs_metadump but somehow xfs_db got missed.
> 
> Thanks to Anatoly for reminding me that unaligned access is
> a thing.  ;)
> 
> Resolves-oss-bugzilla: #1140
> Reported-by: Anatoly Pugachev <matorola at gmail.com>
> Signed-off-by: Eric Sandeen <sandeen at redhat.com>
> ---
Reviewed-by: Bill O'Donnell <billodo at redhat.com>

> 
> diff --git a/db/check.c b/db/check.c
> index c626a5c..0871ed7 100644
> --- a/db/check.c
> +++ b/db/check.c
> @@ -2202,7 +2202,7 @@ process_btinode(
>  		pp = XFS_BMDR_PTR_ADDR(dib, 1, xfs_bmdr_maxrecs(
>  				XFS_DFORK_SIZE(dip, mp, whichfork), 0));
>  		for (i = 0; i < be16_to_cpu(dib->bb_numrecs); i++)
> -			scan_lbtree(be64_to_cpu(pp[i]),
> +			scan_lbtree(get_unaligned_be64(&pp[i]),
>  					be16_to_cpu(dib->bb_level),
>  					scanfunc_bmap, type, id, totd, toti,
>  					nex, blkmapp, 1,
> diff --git a/db/frag.c b/db/frag.c
> index 3beb416..36bb689 100644
> --- a/db/frag.c
> +++ b/db/frag.c
> @@ -258,8 +258,8 @@ process_btinode(
>  	pp = XFS_BMDR_PTR_ADDR(dib, 1,
>  		xfs_bmdr_maxrecs(XFS_DFORK_SIZE(dip, mp, whichfork), 0));
>  	for (i = 0; i < be16_to_cpu(dib->bb_numrecs); i++)
> -		scan_lbtree(be64_to_cpu(pp[i]), be16_to_cpu(dib->bb_level),
> -			scanfunc_bmap, extmapp,
> +		scan_lbtree(get_unaligned_be64(&pp[i]),
> +			 be16_to_cpu(dib->bb_level), scanfunc_bmap, extmapp,
>  			whichfork == XFS_DATA_FORK ? TYP_BMAPBTD : TYP_BMAPBTA);
>  }
>  
> 
> 
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