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Date: Wed, 24 Oct 2001 16:34:13 +0100 (BST)
From: James Sutherland <jas88@cam.ac.uk>
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To: Jan Kara <jack@suse.cz>
cc: Neil Brown <neilb@cse.unsw.edu.au>, <linux-fsdevel@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
Subject: Re: RFC - tree quotas for Linux (2.4.12, ext2)
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On Wed, 24 Oct 2001, Jan Kara wrote:

>   But how do you solve the following: mv <dir> <some_other_dir>
> The parent changes. You need to go through all the subdirs of <dir> and change
> the TID. This is really hard to get right and to avoid deadlocks
> and races... At least it seems to me so.

Provided you are tracking the total size in each directory, it's just a
matter of subtracting dir's size from the old parent, and adding it to the
new parent. (With suitable checks beforehand to avoid a result which
exceeds quota.)


James.
-- 
"Our attitude with TCP/IP is, `Hey, we'll do it, but don't make a big
system, because we can't fix it if it breaks -- nobody can.'"

"TCP/IP is OK if you've got a little informal club, and it doesn't make
any difference if it takes a while to fix it."
		-- Ken Olson, in Digital News, 1988

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