linux-ext4 - Re: [PATCH] sanity check inode size vs inode ratio

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Message-ID: <20070524093831.GI5181@schatzie.adilger.int>
Date:	Thu, 24 May 2007 03:38:31 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Theodore Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] sanity check inode size vs inode ratio

On May 22, 2007  15:45 -0400, Theodore Tso wrote:
> On Mon, May 14, 2007 at 05:03:11PM -0600, Andreas Dilger wrote:
> > A quick patch to sanity check the inode ratio vs the inode size.  In some
> > cases Lustre users have tried specifying an inode size of 4096 bytes, while
> > keeping an inode ratio of one inode per 4096 bytes, causing mke2fs to spin
> > forever trying to allocate the inode tables.  I'm sure more people will do
> > this now that large inodes are available in ext4 and documented in e2fsprogs.
> 
> I can't replicate this.  I'm guessing you are doing this with the
> clusterfs codebase that has the extent patches?  Mke2fs shouldn't be
> spinning if it can't allocate the inode tables.  Instead it should
> print the error message:

Hmm, I suppose it might be due to running this on a 2TB filesystem that is
trying to allocate a huge number of inodes.  It could also have been with
an older version of mke2fs - it was a customer that reported the problem.

I just happened to be poking in that bit of code recently and thought I'd
add the sanity check.  I don't think it relates to CFS patches, since we
don't change mke2fs at all for the extent code.

We can let it drop for now, until I have a reproducer.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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