On Sun, Dec 21, 2008 at 08:43:27AM -0500, Joseph Fannin wrote:
> This is mostly me blowing off a little steam here, so yeah. But maybe
> it won't hurt to send out a heads up and get this in the archives:
>
> Booting a 2.6.28-pre kernel will cause e2fsck to remove the test_fs
> flag from any filesystem it checks, presumably because "ext4dev" has
> become "ext4" in 2.6.28. If your root fs is on ext4, this makes it
> impossible to reboot back into a older kernel (i.e. < 2.6.28) since it
> will refuse to mount an ext4dev fs without the "test_fs" flag set --
> unless you chase after e2fsck and set the flag back.
Yeah, Sorry I guess I didn't think it was going to be *that* common
for people to be going back and forth between the boundary. It is
possible to disable this, BTW, via /etc/e2fsck.conf:
[options]
clear_test_fs_flag = false
The assumption I made was that the number of pre-2.6.28 ext4 users
would be small, and so it would be safe to default the option to true.
- Ted
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