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From: Neil Brown <neilb@cse.unsw.edu.au>
To: Ryan Mack <rmack@mackman.net>
Date: Thu, 18 Oct 2001 16:49:00 +1000 (EST)
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Message-ID: <15310.31580.322324.824333@notabene.cse.unsw.edu.au>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [QUESTION] Stopping RAID devices from Magic SysRq?
In-Reply-To: message from Ryan Mack on Thursday October 11
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On Thursday October 11, rmack@mackman.net wrote:
> I was curious if anyone has previosly considered adding a raid-stop
> functionality to the magic sysrq command?  I realize that a full raid-stop
> would make the partition unavailable for read-only access, which may
> require the system to be immediately reset.  Is there a mechanism to
> remount a raid device read-only if all mounts from it are read-only (i.e.,
> marking the raid superblock clean, syncing, and then only allowing
> read-only access)?
> 
> Thanks, Ryan

This is a nice idea... but awkward.
Particularly if md.o is a module, setting the hooks up properly would
not be tidy.

What we really need is a general concept of setting all drvies to
read-only through the block-dev layer.... maybe in the big blockdev
rewrite that is planned for 2.5...

NeilBrown

> 
> 
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