From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public•gmane.org (Eric W. Biederman)
To: Stanislav Kinsbursky
<skinsbursky-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org>
Cc: "Trond.Myklebust\@netapp.com"
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Subject: Re: [PATCH 01/11] SYSCTL: export root and set handling routines
Date: Tue, 10 Jan 2012 14:39:36 -0800 [thread overview]
Message-ID: <m1ehv76v2v.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <4F0C150F.1020007-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org> (Stanislav Kinsbursky's message of "Tue, 10 Jan 2012 14:38:07 +0400")
Stanislav Kinsbursky <skinsbursky-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org> writes:
> 03.01.2012 07:49, Eric W. Biederman пишет:
>> Stanislav Kinsbursky<skinsbursky-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org> writes:
>>
>>> 19.12.2011 20:37, Eric W. Biederman пишет:
>>>> Stanislav Kinsbursky<skinsbursky-bzQdu9zFT3WakBO8gow8eQ@public•gmane.org> writes:
>>>>
>>>> Doing that independently of the rest of the sysctls is pretty horrible
>>>> and confusing to users. What I am planning might suit your needs and
>>>> if not we need to talk some more about how to get the vfs to do
>>>> something reasonable.
>>>>
>>>
>>> Ok, Eric. Would be glad to discuss your sysctls plans.
>>> But actually you already know my needs: I would like to make sysctls work in the
>>> way like sysfs does: i.e. content of files depends on mount maker -
>>> not viewer.
>>
>> What drives the desire to have sysctls depend on the mount maker?
>
> Because we can (will, actually) have nested fs root's for containers. IOW,
> container's root will be accessible from it's creator context. And I want to
> tune container's fs from creators context.
Tuning the child context from the parent context is an entirely
reasonable thing to do. To affect a namespace that is not yours
the requirement is simply that we don't use current to lookup the
sysctl. So what I am proposing should work for your case.
>> Especially what drives that desire not to have it have a /proc/<pid>/sys
>> directory that reflects the sysctls for a given process.
>>
>
> This is not so important for me, where to access sysctl's. But I'm worrying
> about backward compatibility. IOW, I'm afraid of changing path
> "/proc/sys/sunprc/*" to "/proc/<pid>/sys/sunrpc". This would break a lot of
> user-space programs.
The part that keeps it all working is by adding a symlink from /proc/sys
to /proc/self/sys. That technique has worked well for /proc/net, and I
don't expect there will be any problems with /proc/sys either. It is
possible but is very rare for the introduction of a symlink in a path
to cause problems.
Eric
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next prev parent reply other threads:[~2012-01-10 22:39 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 11:44 [PATCH 00/11] SUNRPC: make sysctl per network namespcase context Stanislav Kinsbursky
2011-12-14 11:44 ` [PATCH 01/11] SYSCTL: export root and set handling routines Stanislav Kinsbursky
[not found] ` <20111214104449.3991.61989.stgit-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2011-12-17 22:25 ` Eric W. Biederman
[not found] ` <m1bor6rg39.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-12-19 8:56 ` Stanislav Kinsbursky
2011-12-19 10:15 ` Eric W. Biederman
[not found] ` <m18vm8g951.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-12-19 12:22 ` Stanislav Kinsbursky
[not found] ` <4EEF2C9A.8000403-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2011-12-19 16:37 ` Eric W. Biederman
[not found] ` <m1pqfkecw0.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-12-19 17:24 ` Stanislav Kinsbursky
[not found] ` <4EEF7364.8000407-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-01-03 3:49 ` Eric W. Biederman
[not found] ` <m1vcotigyb.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2012-01-10 10:38 ` Stanislav Kinsbursky
[not found] ` <4F0C150F.1020007-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-01-10 22:39 ` Eric W. Biederman [this message]
2012-01-11 9:47 ` Stanislav Kinsbursky
2012-01-11 17:21 ` Eric W. Biederman
[not found] ` <m1sjjm40k8.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2012-01-11 18:02 ` Stanislav Kinsbursky
2012-01-11 19:36 ` Eric W. Biederman
2012-01-12 9:17 ` Stanislav Kinsbursky
2011-12-14 11:44 ` [PATCH 02/11] SUNRPC: use syctl path instead of dummy parent table Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 04/11] SUNRPC: per-net sysctl's set introduced Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 05/11] SUNRPC: register debug sysctl table per network namespace Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 06/11] SUNRPC: register xs_tunables " Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 07/11] SUNRPC: xs tunables per network namespace introduced Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 08/11] SUNRPC: use per-net xs tunables instead of static ones Stanislav Kinsbursky
[not found] ` <20111214103602.3991.20990.stgit-bi+AKbBUZKagILUCTcTcHdKyNwTtLsGr@public.gmane.org>
2011-12-14 11:45 ` [PATCH 03/11] SUNRPC: sysctl root for debug table introduced Stanislav Kinsbursky
2011-12-14 11:45 ` [PATCH 09/11] SUNRPC: remove xs_tcp_fin_timeout variable Stanislav Kinsbursky
2011-12-14 11:46 ` [PATCH 10/11] SUNRPC: allow debug flags modifications only from init_net Stanislav Kinsbursky
2011-12-14 11:46 ` [PATCH 11/11] SUNRPC: sysctl table for rpc_debug introduced Stanislav Kinsbursky
2012-02-07 11:44 ` [PATCH 00/11] SUNRPC: make sysctl per network namespcase context Stanislav Kinsbursky
[not found] ` <4F310E8E.5040608-bzQdu9zFT3WakBO8gow8eQ@public.gmane.org>
2012-02-07 13:21 ` Myklebust, Trond
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