linux-kernel - Re: AZFS file system proposal

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Message-ID: <20080617110655.59c915da@mercedes-benz.boeblingen.de.ibm.com>
Date:	Tue, 17 Jun 2008 11:06:55 +0200
From:	Maxim Shchetynin <maxim@...ux.vnet.ibm.com>
To:	linux-fsdevel@...r.kernel.org
Cc:	Jan Engelhardt <jengelh@...ozas.de>,
	Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org
Subject: Re: AZFS file system proposal

> >+config AZ_FS
> >+       tristate "AZFS filesystem support"
> 
> This is slightly redundant, it should probably be
> 	tristate "AZ filesystem support"

I have called it the same way as other file systems (in Kconfig they say "JFS filesystem support", "XFS filesystem support", "NTFS file system support", ...)

> >+       help
> >+         azfs is a file system for I/O attached memory backing. It requires
> >+         a block device with direct_access capability, e.g. axonram.
> 
> (a) What is axonram?
> (b) why is axonram direct_access, and my other devices (including
> standard PC RAM) not?

Axonram is a module specific for IBM CellBlade and allows access to a DDR2 memory attached onto Axon controller.
You don't need direct_access and not azfs for main memory because there is already a pretty nice tmpfs for it.

> >+         Mounting such device with azfs gives memory mapped access to the
> >+         underlying memory to user space.
> 
> Can't I just mmap(/dev/theblockdevice), why would I need to go through 
> azfs?

Yes, you can mmap it. But what does it have to do with a file system. I would say you can either mmap it or place a file system on it.

-- 
Mit freundlichen Grüßen / met vriendelijke groeten / avec regards

    Maxim V. Shchetynin
    Linux Kernel Entwicklung
    IBM Deutschland Entwicklung GmbH
    Linux für Cell, Abteilung 3250
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