Re: Reasons to honor readonly mount requests

[Pavel Machek <pavel@suse.cz>]

Hi!

> > I understand that both ext3fs and
> > reiserfs will try to fix corrupt filesystems (or at least filesystems
> > with unprocessed log entries) in-place even if they're mounted
> > read-only.  Clearly, virtual replay means more work, but -- just for
> > fun -- here are some cases in which it might matter:
> > 
> > 1. You want the disk image untouched for forensic analysis or data
> >    recovery.
> > 2. You don't trust the disk to do writes properly.
> > 3. You don't trust the driver to do writes properly.
> > 4. You want to test a newer or unstable FS implementation w/ option to
> >    go back to the older one.
> 
> Excluding the root fs (which probably isn't involved in these sorts of
> things anyways), you can always turn off the "RECOVERY" flag on the
> filesystem and mount ext3 as ext2, which will not do any recovery.

_If_ you happen to realize that mount -o ro -t ext3 is not really read
only. sct know it may write to filesystem, now I know it; but I
believe that if you asked Joe Admin 

"Linux writes to partition mounted read-only in some cases; is it a
bug?"

he would say

"YES!"
								Pavel

-- 
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
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