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Re: [PATCH v3 04/11] xfs: update inode allocation/free transaction reser

To: Brian Foster <bfoster@xxxxxxxxxx>
Subject: Re: [PATCH v3 04/11] xfs: update inode allocation/free transaction reservations for finobt
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 20 Feb 2014 13:14:57 -0800
Cc: Dave Chinner <david@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <53064E26.2050607@xxxxxxxxxx>
References: <1391536182-9048-1-git-send-email-bfoster@xxxxxxxxxx> <1391536182-9048-5-git-send-email-bfoster@xxxxxxxxxx> <20140211064609.GE13647@dastard> <530393F8.4070106@xxxxxxxxxx> <20140220020101.GL4916@dastard> <53064E26.2050607@xxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Thu, Feb 20, 2014 at 01:49:10PM -0500, Brian Foster wrote:
> > Right, that can happen. But my question is this: how realistic is it
> > that we have someone who has ENOSPC because of enough zero length
> > files to trigger this? I've never seen an application or user try to
> > store any significant number of zero length files, so I suspect this
> > is a theoretical problem, not a practical one.
> > 
> Probably not very realistic. ;) The only thing I know that does rely on
> some zero-length files is gluster distribution to represent "link files"
> when one a file that hashes to one server ends up stored on another.
> Even then, I don't see how we would ever have a situation where those
> link files exist in such massive numbers and are removed in bulk. So
> it's likely a pathological scenario.

Zero data blocks are the only case for device nodes or fifos, very
common for symlinks that can be stored inline, and not unusual for

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