linux-kernel - Re: [1/4] DST: Distributed storage documentation.

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Message-ID: <20071210125839.GA16789@2ka.mipt.ru>
Date:	Mon, 10 Dec 2007 15:58:39 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, Greg KH <greg@...ah.com>
Subject: Re: [1/4] DST: Distributed storage documentation.

On Mon, Dec 10, 2007 at 01:51:43PM +0100, Kay Sievers (kay.sievers@...y.org) wrote:
> On Dec 10, 2007 12:47 PM, Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> > diff --git a/Documentation/dst/sysfs.txt b/Documentation/dst/sysfs.txt
> > new file mode 100644
> > index 0000000..79d79dc
> > --- /dev/null
> > +++ b/Documentation/dst/sysfs.txt
> > @@ -0,0 +1,30 @@
> > +This file describes sysfs files created for each storage.
> > +
> > +1. Per-storage files.
> > +Each storage has its own dir /sysfs/devices/$storage_name,
> 
> It's always /sys/devices/.

I meant that for each new device, it will be placed into
/sys/devices/its_name, but it can also be accessed via
/sys/bus/dst/devices/

> > +which contains following files:
> > +
> > +alg - contains name of the algorithm used to created given storage
> > +name - name of the storage
> > +nodes - map of the storage (list of nodes and their sizes and starts)
> > +remove_all_nodes - writable file which allows to remove all nodes from given
> > +       storage
> > +n-$start-$cookie - per node directory, where
> > +       $start - start of the given node in sectors,
> > +       $cookie - unique node's id used by DST
> > +
> > +2. Per-node files.
> > +Node's files are located in /sysfs/devices/$storage_name/n-$start-$cookie
> > +directory, described above.
> 
> To which class or bus do the devices you create belong? Care to show a
> "tree" or "ls -la" of the device?

It is 'dst' bus.

uganda:~/codes# ls -la /sys/devices/staorge/
total 0
drwxr-xr-x 4 root root    0 2007-12-10 11:46 .
drwxr-xr-x 9 root root    0 2007-12-10 11:46 ..
-r--r--r-- 1 root root 4096 2007-12-10 11:46 alg
lrwxrwxrwx 1 root root    0 2007-12-10 11:46 bus -> ../../bus/dst
drwxr-xr-x 3 root root    0 2007-12-10 11:46 n-0-ffff81003e24117
-r--r--r-- 1 root root 4096 2007-12-10 11:46 name
-r--r--r-- 1 root root 4096 2007-12-10 11:46 nodes
drwxr-xr-x 2 root root    0 2007-12-10 11:46 power
-rw-r--r-- 1 root root 4096 2007-12-10 11:46 remove_all_nodes
lrwxrwxrwx 1 root root    0 2007-12-10 11:46 subsystem -> ../../bus/dst
-rw-r--r-- 1 root root 4096 2007-12-10 11:46 uevent
uganda:~/codes# ls -l /sys/bus/dst/
total 0
drwxr-xr-x 2 root root    0 2007-12-10 09:52 devices
drwxr-xr-x 2 root root    0 2007-12-10 09:52 drivers
-rw-r--r-- 1 root root 4096 2007-12-10 11:46 drivers_autoprobe
--w------- 1 root root 4096 2007-12-10 11:46 drivers_probe


> Kay

-- 
	Evgeniy Polyakov
--
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