linux-kernel - Re: AZFS file system proposal

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Message-ID: <20080610104919.504b9826@mercedes-benz.boeblingen.de.ibm.com>
Date:	Tue, 10 Jun 2008 10:49:19 +0200
From:	Maxim Shchetynin <maxim@...ux.vnet.ibm.com>
To:	Matthew Wilcox <matthew@....cx>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: AZFS file system proposal

On Mon, 9 Jun 2008 06:55:30 -0600
Matthew Wilcox <matthew@....cx> wrote:

> On Mon, Jun 09, 2008 at 10:46:50AM +0200, Maxim Shchetynin wrote:
> > +config AZ_FS
> > +	tristate "AZFS filesystem support"
> > +	help
> > +	  Non-buffered filesystem for block devices with a gendisk and
> > +	  with direct_access() method in gendisk->fops.
> > +	  AZFS does not buffer outgoing traffic and is doing no read ahead.
> > +	  It supports mount options (given with -o) bs=x,uid=x,gid=x.
> > +	  If block-size (bs) is not specified AZFS uses block-size used
> > +	  by block device. Though mmap() method is available only if
> > +	  block-size equals to or is greater than system page size.
> 
> This is a terrible description.  I can't even suggest better wording
> because I don't understand it.  The correct wording would not mention
> gendisks, fops or direct_access().  It would tell the user what they
> might use it for.
> 

What do you think about the following - shorter description and a better place for it (moved to "Pseudo filesystems"):

--- linux-2.6.26-rc5/fs/Kconfig 2008-06-05 05:10:44.000000000 +0200
+++ linux-2.6.26-rc5-azfs/fs/Kconfig    2008-06-10 10:43:24.326686538 +0200
@@ -1017,6 +1017,19 @@
 config HUGETLB_PAGE
        def_bool HUGETLBFS

+config AZ_FS
+       tristate "AZFS filesystem 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.
+         Mounting such device with azfs gives memory mapped access to the
+         underlying memory to user space.
+
+         To compile this file system support as a module, choose M here: the
+         module will be called azfs.
+
+         If unsure, say N.
+
 config CONFIGFS_FS
        tristate "Userspace-driven configuration filesystem"
        depends on SYSFS

-- 
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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    71032 Böblingen

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