Re: [PATCH v2 1/4] common: Check for fiemap range argument support

[Eryu Guan <eguan@redhat.com>]

On Tue, Oct 31, 2017 at 04:11:33PM +0200, Nikolay Borisov wrote:
> Signed-off-by: Nikolay Borisov <nborisov@suse.com>
> ---
>  common/rc | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/common/rc b/common/rc
> index e2a8229..673f9ef 100644
> --- a/common/rc
> +++ b/common/rc
> @@ -2053,8 +2053,15 @@ _require_xfs_io_command()
>  			-c "$command 4k 8k" $testfile 2>&1`
>  		;;
>  	"fiemap")
> +		if [ ! -z "$param" ]
> +		then
> +			$XFS_IO_PROG -c "help fiemap" | head -n 1 | grep -q "[offset [len]]" || \
                                                                            ^^^^^^^^^^^^^^^^
this doesn't look correct to me, the "bracket expression" is a
"Character Classes", grep matches any single char in the char set. A
quick test shows it only matches the last two chars, that's "n]"

$ echo "[offset len]" | grep  "[offset [len]]"
[offset len]
          ^^ highlighted

fgrep should work, or grep -q "\[offset \[len\]\]"

But now the fiemap check in _require_xfs_io_command checks range support
on whatever $param it takes, even the '[-al] [-n nx]' param that have
nothing to do with range.

Thanks,
Eryu

> +				_notrun "xfs_io $command range param support is missing"
> +		fi
> +
>  		testio=`$XFS_IO_PROG -F -f -c "pwrite 0 20k" -c "fsync" \
>  			-c "fiemap -v $param" $testfile 2>&1`
> +
>  		param_checked=1
>  		;;
>  	"flink" )
> -- 
> 2.7.4
>