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Re: inode64 readiness testing

To: Peter Kimball <peterakimball@xxxxxxxxx>
Subject: Re: inode64 readiness testing
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 22 Nov 2011 11:19:40 +1100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <C5842F44-178B-403C-9C07-BA475B16DE75@xxxxxxxxx>
References: <501A7AEB-6708-4181-AAE2-D145DC23B938@xxxxxxxxx> <20111120191050.GB11957@xxxxxxxxxxxxx> <C5842F44-178B-403C-9C07-BA475B16DE75@xxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Nov 21, 2011 at 03:46:04PM -0500, Peter Kimball wrote:
> On Nov 20, 2011, at 2:10 PM, Christoph Hellwig wrote:
> > On Fri, Nov 18, 2011 at 12:33:16PM -0500, Peter Kimball wrote:
> >> I created a blank 1GB disk image, created an XFS filesystem on
> >> that image, and mounted it on a loopback device using the ino64
> >> flag.  
> >> 
> >> I wrote a bunch of data to the filesystem (lots of small
> >> files), approximately 600MB.
> >> 
> >> At this point, I think I have a filesystem in which inodes use
> >> 64-bit addresses, even if the actual address value would fit in
> >> 32 bits.  I would expect any program that can't handle 64-bit
> >> addresses to barf when trying to access any data on the
> >> filesystem.
> > 
> > You will never not see 64-bit inodes on a filesystem that small
> > ever.  Try to create a (sparse) 10TB loop image, and create some
> > deep directories in it.  This should create some larger inodes
> > number for you if you had it mounted with the inode64 flag.  You
> > can verify that by checking that the inode number returned from
> > the stat systsem call or from ls -i is larger than 32 bits.
> > 
> Thank you for that guide, Christoph.  I followed your directions
> and the directory tree I created included some >32-bit inode
> numbers so I was able to successfully test all of our NFS clients.
> From what I'd read, I thought that the ino64 mount option would do
> the work for me (bring 32-bit inode numbers into 64-bit range),
> apparently that is not the case.  This method worked great,
> hopefully the next person to search can find this happy thread.

The ino64 mount option does not exist any more - it got removed
quite some time ago as it was debug-only code that nobody ever
tested or verified did the right thing...


Dave Chinner

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