Re: passing params to boot readonly

From: Ryan Cumming (
Date: Thu Dec 13 2001 - 01:41:20 EST

On December 12, 2001 21:50, Stewart Allen wrote:
> I'm in a bit of a pickle and need to find a way to pass boot params to a
> reiserfs rootfs to *prevent* it from replaying the journal on single-user
> boot. This may seem like a strange request, but I've got a degraded RAID
> array that I need to poke around in before deciding whether or not to send
> a disk off to a rehab lab. If the replay occurs, it will potentially
> destroy the fs since I'm using a degraded snapshot of the failed disk in
> hopes of reclaiming *some* of my data. The system is running 2.2.x (can't
> remember and can't find out w/out booting).
> Do I have a snowball's chance of pulling this off?

Well, kinda. The only thing that can deter ReiserFS from replaying the
journal is convincing it that the physical media it's on is actually read
only. Some quick less/grep work revealed that there is no option that makes
the SCSI subsystem claim its devices are readonly (although it'd be extremely
useful for situations such as this).

It'd probably be pretty easy to make a boot disk using a hacked version of
ReiserFS that refuses to replay the journal, by adding a "return 0;" near the
top of journal_read(struct super_block *) in journal.c. However, you might
feel more comfortable sending it off for data recovery than testing kernel
hacks on it ;)

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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:25 EST