linux-ext4 - Re: [v6 2/4] ext4: adds project ID support

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Date:	Mon, 10 Nov 2014 23:26:06 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Li Xi <pkuelelixi@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-api@...r.kernel.org, adilger@...ger.ca, jack@...e.cz,
	viro@...iv.linux.org.uk, hch@...radead.org, dmonakhov@...nvz.org
Subject: Re: [v6 2/4] ext4: adds project ID support

On Sun, Nov 09, 2014 at 01:43:37AM +0800, Li Xi wrote:
> This patch adds a new internal field of ext4 inode to save project
> identifier. Also a new flag EXT4_INODE_PROJINHERIT is added for
> inheriting project ID from parent directory.

What would be the downside of simply always inhereiting the project ID
from the parent directory?  I see that if the flag is not set, the
project id will be 0 instead.  I'm not sure when that would actually
be desirable.

To the extent that the project ID is designed to implement a quota
over a directory extent, the fact that the owner can clear the
EXT4_PROJINHERET_FL and then arrange to have the quota charged to
project 0 seems to me to be a bug, not a feature.

Can you explain what your intended use case for this flag might be?

Thanks,

						- Ted
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