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Re: grub-probe detects ext4 wronly as ext2

From: Bean
Subject: Re: grub-probe detects ext4 wronly as ext2
Date: Mon, 30 Jun 2008 03:17:17 +0800

On Mon, Jun 30, 2008 at 2:46 AM, Javier Martín <address@hidden> wrote:
> El dom, 29-06-2008 a las 20:11 +0200, Felix Zielcke escribió:
>> Hello,
>> I reported this already on Debian as #488235
>> grub-probe -t fs shows ext2 for a filesystem created with e2fsprogs 1.41WIP
>> from Debian experimental
>> with extent and flex_bg
>> I didn't get grub-probe working with the loopback device even though I added
>> it to it still complained.
>> The attached image is a 10 mb ext4 made with mkfs.ext4 without any special
>> options just the extent and flex_bg features enabled by mke2fs.conf
>> If I make that on a 100 MB Disk in VMware grub-probe -t fs shows ext2 so I
>> think it shouldn't be different on that 10 MB file
> ext4 on-disk format is very similar to ext2, but backwards compatibility
> is broken by the extents option (and iIrc, a modification in the inode
> format?). Thus, we need to patch our ext2/3 drivers so that they reject
> mounting a filesystem with the "extents" feature bit set, as a temporary
> solution. Then, we can develop an ext4 driver that understands the new
> format.


I think it's not difficult to add extents support for grub2. Is the
feature stable now, how many distro enable it by default ?


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