[PATCH 8/9] repair: handle remote symlink CRC errors

[Brian Foster]

On Tue, Apr 29, 2014 at 07:04:58AM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner at redhat.com>
> 
> We can't really repair broken symlink buffer contents, but we can at
> least warn about it and correct the CRC error so the symlink is
> again readable.
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>
> ---

Reviewed-by: Brian Foster <bfoster at redhat.com>

>  repair/dinode.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/repair/dinode.c b/repair/dinode.c
> index b086bec..8891e84 100644
> --- a/repair/dinode.c
> +++ b/repair/dinode.c
> @@ -1254,6 +1254,7 @@ process_symlink_remote(
>  	while (pathlen > 0) {
>  		int	blk_cnt = 1;
>  		int	byte_cnt;
> +		int	badcrc = 0;
>  
>  		fsbno = blkmap_get(blkmap, i);
>  		if (fsbno == NULLDFSBNO) {
> @@ -1284,6 +1285,12 @@ _("cannot read inode %" PRIu64 ", file block %d, disk block %" PRIu64 "\n"),
>  				lino, i, fsbno);
>  			return 1;
>  		}
> +		if (bp->b_error == EFSBADCRC) {
> +			do_warn(
> +_("Bad symlink buffer CRC, block %" PRIu64 ", inode %" PRIu64 ".\n"
> +  "Correcting CRC, but symlink may be bad.\n"), fsbno, lino);
> +			badcrc = 1;
> +		}
>  
>  		byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
>  		byte_cnt = MIN(pathlen, byte_cnt);
> @@ -1307,7 +1314,10 @@ _("bad symlink header ino %" PRIu64 ", file block %d, disk block %" PRIu64 "\n")
>  		offset += byte_cnt;
>  		i++;
>  
> -		libxfs_putbuf(bp);
> +		if (badcrc && !no_modify)
> +			libxfs_writebuf(bp, 0);
> +		else
> +			libxfs_putbuf(bp);
>  	}
>  	return 0;
>  }
> -- 
> 1.9.0
> 
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