From: Jim Cromie <jim.cromie@gmail.com>
To: kernel learner <kernellearner@gmail.com>
Cc: linux-fsdevel@vger.kernel.org, kernelnewbies@nl.linux.org
Subject: Re: Upgrading datastructures between different filesystem versions
Date: Tue, 25 Sep 2007 23:40:59 -0600 [thread overview]
Message-ID: <46F9F0EB.6020404@gmail.com> (raw)
In-Reply-To: <7e77a4050709250827p26683c6bqc65832783ba1c365@mail.gmail.com>
kernel learner wrote:
> Hi,
>
> ext3 filesystem has 32-bit block address and ext4 filesystem has
> 48-bit block address. If a user installs ext4, how will the file
> system handle already existing block with 32 bit values?
Why should it ?
thats what ext3 is for.
your kernel can have both FS's supported, and would use ext3 drivers for
ext3
filesystems its asked to mount.
Id expect ext4 drivers handling ext3 filesystems is a distant, secondary
goal
to getting a fast, reliable, clean 48bit filesystem working.
> Can anyone point me to the correct pointer for this backward
> compatibility stuff? I searched for it but cudn't find much info. Is
> the work still pending on this front?
>
> Thanks,
> KL
next prev parent reply other threads:[~2007-09-26 5:48 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-25 15:27 Upgrading datastructures between different filesystem versions kernel learner
2007-09-26 5:40 ` Jim Cromie [this message]
2007-09-26 16:17 ` Andreas Dilger
2007-09-26 23:29 ` Sachin Gaikwad
2007-09-27 0:53 ` Theodore Tso
2007-09-28 13:11 ` Erik Mouw
2007-09-28 13:31 ` Christoph Hellwig
2007-09-28 19:47 ` Theodore Tso
2007-09-29 9:05 ` Christoph Hellwig
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