From: Pavel Emelyanov <xemul-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org>
To: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public•gmane.org>,
Alan Cox <alan-qBU/x9rampVanCEyBjwyrvXRex20P6io@public•gmane.org>,
Stanislav Kinsbursky
<skinsbursky-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org>
Cc: "J. Bruce Fields"
<bfields-uC3wQj2KruNg9hUCZPvPmw@public•gmane.org>,
"Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public•gmane.org"
<Trond.Myklebust-HgOvQuBEEgTQT0dZR+AlfA@public•gmane.org>,
"davem-fT/PcQaiUtIeIZ0/mPfg9Q@public•gmane.org"
<davem-fT/PcQaiUtIeIZ0/mPfg9Q@public•gmane.org>,
"linux-nfs-u79uwXL29TY76Z2rM5mHXA@public•gmane.org"
<linux-nfs-u79uwXL29TY76Z2rM5mHXA@public•gmane.org>,
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<viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public•gmane.org>,
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<tim.c.chen-VuQAYsv1563Yd54FQh9/CA@public•gmane.org>,
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<devel-GEFAQzZX7r8dnm+yROfE0A@public•gmane.org>
Subject: Re: [RFC PATCH 0/2] net: connect to UNIX sockets from specified root
Date: Sat, 11 Aug 2012 10:23:22 +0400 [thread overview]
Message-ID: <5025FA5A.4090403@parallels.com> (raw)
In-Reply-To: <50259494.8060304-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
On 08/11/2012 03:09 AM, H. Peter Anvin wrote:
> On 08/10/2012 12:28 PM, Alan Cox wrote:
>> Explicitly for Linux yes - this is not generally true of the AF_UNIX
>> socket domain and even the permissions aspect isn't guaranteed to be
>> supported on some BSD environments !
>
> Yes, but let's worry about what the Linux behavior should be.
>
>> The name is however just a proxy for the socket itself. You don't even
>> get a device node in the usual sense or the same inode in the file system
>> space.
>
>
> No, but it is looked up the same way any other inode is (the difference
> between FIFOs and sockets is that sockets have separate connections,
> which is also why open() on sockets would be nice.)
>
> However, there is a fundamental difference between AF_UNIX sockets and
> open(), and that is how the pathname is delivered. It thus would make
> more sense to provide the openat()-like information in struct
> sockaddr_un, but that may be very hard to do in a sensible way. In that
> sense it perhaps would be cleaner to be able to do an open[at]() on the
> socket node with O_PATH (perhaps there should be an O_SOCKET option,
> even?) and pass the resulting file descriptor to bind() or connect().
I vote for this (openat + O_WHATEVER on a unix socket) as well. It will
help us in checkpoint-restore, making handling of overmounted/unlinked
sockets much cleaner.
> -hpa
Thanks,
Pavel
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next prev parent reply other threads:[~2012-08-11 6:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-10 12:57 [RFC PATCH 0/2] net: connect to UNIX sockets from specified root Stanislav Kinsbursky
[not found] ` <20120810125701.7115.71612.stgit-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2012-08-10 12:57 ` [RFC PATCH 1/2] unix sockets: add ability for search for peer from passed root Stanislav Kinsbursky
2012-08-10 18:10 ` J. Bruce Fields
[not found] ` <20120810181002.GB17404-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-08-10 18:43 ` Stanislav Kinsbursky
2012-08-10 18:15 ` [RFC PATCH 0/2] net: connect to UNIX sockets from specified root H. Peter Anvin
2012-08-10 18:26 ` Alan Cox
[not found] ` <20120810192628.79a34d28-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-08-10 18:31 ` H. Peter Anvin
[not found] ` <5025537D.9060300-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-08-10 18:40 ` Alan Cox
2012-08-10 18:42 ` H. Peter Anvin
2012-08-10 19:11 ` J. Bruce Fields
[not found] ` <20120810191149.GA17985-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-08-10 19:28 ` Alan Cox
2012-08-10 23:09 ` H. Peter Anvin
[not found] ` <50259494.8060304-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-08-11 6:23 ` Pavel Emelyanov [this message]
2012-08-11 11:15 ` Stanislav Kinsbursky
2012-08-13 16:47 ` J. Bruce Fields
2012-08-13 17:39 ` Stanislav Kinsbursky
2012-08-13 18:24 ` J. Bruce Fields
[not found] ` <20120813182431.GA4234-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org>
2012-08-14 8:46 ` Stanislav Kinsbursky
2012-08-10 18:50 ` Stanislav Kinsbursky
2012-08-10 12:57 ` [RFC PATCH 2/2] SUNRPC: connect local transports with unix_stream_connect_root() helper Stanislav Kinsbursky
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