linux-ext4 - Re: [PATCH 4/4] Adds ioctl interface support for ext4 project

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Message-ID: <20140924162634.GA16886@infradead.org>
Date:	Wed, 24 Sep 2014 09:26:34 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Li Xi <pkuelelixi@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-api@...r.kernel.org,
	tytso@....edu, adilger@...ger.ca, viro@...iv.linux.org.uk,
	hch@...radead.org, dmonakhov@...nvz.org, xfs@....sgi.com
Subject: Re: [PATCH 4/4] Adds ioctl interface support for ext4 project

On Wed, Sep 24, 2014 at 06:25:07PM +0200, Jan Kara wrote:
> On Wed 24-09-14 22:04:30, Li Xi wrote:
> > This patch adds ioctl interface for setting/getting project of ext4.
>   The patch looks good to me. I was just wondering whether it won't be
> useful to add an ioctl() which isn't ext4 specific. We could just extend
> ->setattr() to allow setting of project ID (most filesystems would just
> return -EOPNOTSUPP but ext4 and xfs could do the right thing) and then call
> ->setattr from the generic ioctl. That way userspace won't have to care
> about filesystem type when setting project ID... What do others think?

Absolutely.  In general I also wonder why this patch doesn't implement
the full XFS API.  Maybe there is a reason it was considered and
rejected, but it would be helpful to document why.

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