From: David Chinner <dgc@sgi.com>
To: David Sparks <dave@ca.sophos.com>
Cc: xfs@oss.sgi.com
Subject: Re: mkfs.xfs ... lazy-count=1 ... not mountable by older kernels?
Date: Wed, 12 Dec 2007 09:15:55 +1100 [thread overview]
Message-ID: <20071211221554.GC4612@sgi.com> (raw)
In-Reply-To: <475EE83A.3060607@ca.sophos.com>
On Tue, Dec 11, 2007 at 11:42:50AM -0800, David Sparks wrote:
> Hi all,
>
> Is it expected that filesystems made with lazy-count=1 are not mountable by
> older kernels?
That is expected. lazy-count is a mkfs option because it changes the on-disk
format slightly, and older kernels do not understand that format. Hence
mkfs sets a superblock feature bit to prevent the filesystem from being
mounted on kernels that don't understand the slightly different disk format.
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
next prev parent reply other threads:[~2007-12-11 22:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-11 19:42 mkfs.xfs ... lazy-count=1 ... not mountable by older kernels? David Sparks
2007-12-11 22:15 ` David Chinner [this message]
2007-12-12 0:37 ` Timothy Shimmin
2007-12-12 13:19 ` Justin Piszcz
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