linux-ext4 - Re: booked-page-flag.patch

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Message-ID: <20070216121408.GQ10715@schatzie.adilger.int>
Date:	Fri, 16 Feb 2007 05:14:08 -0700
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alex Tomas <alex@...sterfs.com>, Eric Sandeen <sandeen@...hat.com>,
	Theodore Ts'o <tytso@....edu>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: booked-page-flag.patch

On Feb 16, 2007  00:06 -0800, Andrew Morton wrote:
> On Fri, 16 Feb 2007 10:56:55 +0300 Alex Tomas <alex@...sterfs.com> wrote:
> > well, even so we need to reserve not that block ony, but
> > also needed metadata (for the worst case).
> 
> Right.  Reserve all the blocks for the page and all the metadata for a page
> at that file offset.  Worst case.

This only really becomes an issue when the filesystem (+reservations)
is close to being full.  If we are close enough to worry about running
out of space we can also refuse to do delayed allocation.
 
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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