Date: Tue, 15 Jul 2008 10:08:25 +0530 From: "Tapan Chaudhari" <tapan.list@gmail.com> To: freebsd-hackers@freebsd.org Subject: Re: Can I change the device of the "/" mount point at boot time. Message-ID: <482257ad0807142138j1f7b7dd8nda7de865a4616fc0@mail.gmail.com> In-Reply-To: <200807151302.30415.doconnor@gsoft.com.au> References: <482257ad0807141106m679ec19frd853339637d27a2d@mail.gmail.com> <20080714165747.6c12371b@bhuda.mired.org> <482257ad0807141925m37c5b46bqa65c33852078b6f8@mail.gmail.com> <200807151302.30415.doconnor@gsoft.com.au>
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Hey, Thanks Deniel for the reply. I am aware of the fact you mentioned and will keep in mind. Well what i am trying to achieve is a simple thing to write an interception driver to catch all the i/os going to a particular device, do some manipulations on it and than let it through to the original device. Well as you mentioned about geom, I have recently posted a mail on GEOM mailing list as I could not find geom doing interception, the discussion is still on (You can see the mails with subject line "Can GEOM be used to intercept the I/o calls to an existing mounted device?"). Any sugessuions on interception driver will be helpful? As an interception driver is not possible, for time being I am going towards the redirection concept which will require a reboot and changing the devices on the mount points. For redirection driver, I dont think I will need geom. I can directly create a new device. Rather I think it would be an overhead using geom for a virtual device. Any thoughts on both the issues? Thanks, --Tapan. On Tue, Jul 15, 2008 at 9:02 AM, Daniel O'Connor <doconnor@gsoft.com.au> wrote: > On Tue, 15 Jul 2008, Tapan Chaudhari wrote: > > Thank You Mateusz and Mike. I guess I am clear with my doubt now. I > > will also go through the man pages to go into depth of it. > > The critical thing is that the loader must read the kernel (and modules, > config etc..) from a disk the BIOS knows about. > > After that you can use any device the kernel knows about. > > As for the virtual device aspect - could you use a geom class to do you > want? It's hard to say without an overview of what you actually want to > achieve :) > > -- > Daniel O'Connor software and network engineer > for Genesis Software - http://www.gsoft.com.au > "The nice thing about standards is that there > are so many of them to choose from." > -- Andrew Tanenbaum > GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C >
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