linux-ext4 - Re: [PATCH] xfs_quota: allow operation on foreign filesystem types

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Date:	Fri, 15 Jan 2016 22:41:15 -0600
From:	Eric Sandeen <sandeen@...deen.net>
To:	xfs@....sgi.com
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	fstests <fstests@...r.kernel.org>
Subject: Re: [PATCH] xfs_quota: allow operation on foreign filesystem types

On 1/13/16 6:03 PM, Dave Chinner wrote:
> From: Dave Chinner <dchinner@...hat.com>
> 
> This allows xfs_quota to be used on ext4 for project quota testing
> in xfstests.
> 
> Signed-off-by: Dave Chinner <dchinner@...hat.com>
> ---

...


> diff --git a/quota/report.c b/quota/report.c
> index c77b24f..eaf3a67 100644
> --- a/quota/report.c
> +++ b/quota/report.c
> @@ -658,6 +658,7 @@ report_init(void)
>  	dump_cmd.args = _("[-gpu] [-f file]");
>  	dump_cmd.oneline = _("dump quota information for backup utilities");
>  	dump_cmd.help = dump_help;
> +	dump_cmd.flags = CMD_FLAG_FOREIGN_OK;
>  
>  	report_cmd.name = "report";
>  	report_cmd.altname = "repquota";
> @@ -668,6 +669,7 @@ report_init(void)
>  	report_cmd.args = _("[-bir] [-gpu] [-ahnt] [-f file]");
>  	report_cmd.oneline = _("report filesystem quota information");
>  	report_cmd.help = report_help;
> +	report_cmd.flags = CMD_FLAG_FOREIGN_OK;

There's another

	report_cmd.flags = CMD_FLAG_GLOBAL;

above this which gets overwritten here; this command needs to be:

	report_cmd.flags = CMD_FLAG_GLOBAL | CMD_FLAG_FOREIGN_OK;

or else

	xfs_quota -x -c "report -a"

goes bonkers, iterating in nested loops and printing filesystems multiple times.

It also seems that "report -a" should not be changing defaults this way such
that non-xfs filesystems will get printed; this will be an unexpected change
to default behavior.

Perhaps a top-level "-f" option to explicitly enable foreign filesystem detection
would be best?

-Eric
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