From: "Kirill A. Shutemov" <kas-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
To: Rob Landley <rlandley-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
Cc: "Kirill A. Shutemov"
<kas-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>,
Trond Myklebust
<Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>,
"J. Bruce Fields"
<bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>,
Neil Brown <neilb-l3A5Bk7waGM@public.gmane.org>,
Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>,
linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>,
Al Viro <viro-3bDd1+5oDREiFSDQTTA3OLVCufUGDwFn@public.gmane.org>,
containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v3 00/16] make rpc_pipefs be mountable multiple time
Date: Thu, 20 Jan 2011 13:35:52 +0200 [thread overview]
Message-ID: <20110120113552.GB24349@shutemov.name> (raw)
In-Reply-To: <4D343658.1020205-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
On Mon, Jan 17, 2011 at 06:30:16AM -0600, Rob Landley wrote:
> On 01/14/2011 07:48 AM, Kirill A. Shutemov wrote:
> > Prepare nfs/sunrpc stack to use multiple instances of rpc_pipefs.
> > Only for client for now.
>
> Ok, Google is being really unhelpful here.
It's better if you read the code. :)
>
> What is rpc_pipefs for? What uses it, and to do what exactly? Is it
> used by nfs server code, or by the client code, or both? Is it a way
> for userspace to talk to the kernel, or for the kernel to talk to
> itself? Is it used at mount time, or during filesystem operation?
Ok, It try to answer. Please correct me, if I'm wrong.
rpc_pipefs is a userland/kernel interface (I don't see kernel-kernel
usecases, but it's possible, I guess).
There is client dir (nfs/clntX) in rpc_pipefs for every sunrpc client.
Both client and server (see fs/nfsd/nfs4callback.c) can create sunrpc
client. So we rpc_pipefs on both side.
rpc_pipefs uses not only on mount time. See old idmapper, for example.
> I'm interested in giving this patch series a much more thorough review,
> but I can't figure out what the subsystem it's modifying actually _is_.
>
> (Maybe this is something to do with filesystems/nfs/rpc-cache.txt?)
>
> Rob
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2011-01-20 11:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-14 13:48 [PATCH v3 00/16] make rpc_pipefs be mountable multiple time Kirill A. Shutemov
2011-01-14 13:48 ` [PATCH v3 01/16] sunrpc: mount rpc_pipefs on initialization Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 02/16] sunrpc: introduce init_rpc_pipefs Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 05/16] sunrpc: get rpc_pipefs mount point for svc_serv from callers Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 07/16] sunrpc: get rpc_pipefs mount point for rpcb_create[_local] " Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 09/16] sunrpc: introduce rpc_pipefs_add_destroy_cb() Kirill A. Shutemov
[not found] ` <1295012954-7769-10-git-send-email-kas-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
2011-01-20 11:37 ` Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 10/16] nfs: per-rpc_pipefs dns cache Kirill A. Shutemov
[not found] ` <1295012954-7769-1-git-send-email-kas-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>
2011-01-14 13:49 ` [PATCH v3 03/16] sunrpc: push init_rpc_pipefs up to rpc_create() callers Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 04/16] sunrpc: tag svc_serv with rpc_pipefs mount point Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 06/16] lockd: get rpc_pipefs mount point from callers Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 08/16] sunrpc: tag pipefs field of cache_detail with rpc_pipefs mount point Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 11/16] Export iterate_mounts symbol to be able to use from sunrpc module Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 12/16] sunrpc: introduce get_rpc_pipefs() Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 14/16] sunrpc: make rpc_pipefs be mountable multiple times Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 16/16] Rework get_rpc_pipefs and introduce put_rpc_pipefs() Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 13/16] nfs: introduce mount option 'rpcmount' Kirill A. Shutemov
2011-01-14 13:49 ` [PATCH v3 15/16] sunrpc: remove global init_rpc_pipefs Kirill A. Shutemov
2011-01-17 12:30 ` [PATCH v3 00/16] make rpc_pipefs be mountable multiple time Rob Landley
[not found] ` <4D343658.1020205-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-01-20 11:35 ` Kirill A. Shutemov [this message]
2011-01-20 13:57 ` Rob Landley
2011-01-20 15:52 ` J. Bruce Fields
2011-01-24 23:55 ` Kirill A. Shutemov
[not found] ` <20110124235545.GA793@shutemov.name>
[not found] ` <20110124235545.GA793-oKw7cIdHH8eLwutG50LtGA@public.gmane.org>
2011-01-25 0:25 ` J. Bruce Fields
2011-01-25 1:53 ` Rob Landley
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