Kernel Question

[der.hans]

Am 26. May, 2002 schwätzte George Toft so:

> I need some help from you kernel warriors.
>
> I just changed my root filesystem from reiserfs to ext3
> (tar -c, mke2cf, tar -x), rebooted, and it worked fine.
> I expected problems.  I know, why look a gift horse in
> the mouth?
>
> Here's the weird part - /etc/fstab still showed my root filesystem
> is reiserfs:
> /dev/hdc3       /                       reiserfs        defaults   1   1
>
> and running mount verified it was mounted as reiserfs.
>
> I changed /etc/fstab:
> /dev/hdc3       /                       ext3            defaults   1   1
>
> rebooted, went through a long fsck (no errors), and now it it mounted
> as ext3, verified by mount.
>
> How does the kernel know which filesystem to use when looking for
> /etc/modules.conf and /etc/fstab?

mount reads from /etc/mtab. It should read from /proc because it gives
incorrect info when /etc is read-only.

Not sure why everything was still working. I wonder if it auto-detected the
ext3 filesystem.

ciao,

der.hans
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