lkml.org 
[lkml]   [2011]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 0/5] net: sysctl: share ipv4/ipv6 sysctl tables
From
On Fri, Feb 4, 2011 at 6:37 AM, Lucian Adrian Grijincu
<lucian.grijincu@gmail.com> wrote:
> Each network device gets the same 25/24 sysctl entries for ipv4/ipv6
> in /proc/sys/net/ipv4/conf/DEVNAME and /proc/sys/net/ipv6/conf/DEVNAME
>
> Unfortunately, space is wasted holding very much similar data.
> Fortunately, with some tricks these entries can be shared between all
> network devices.
>
>
> The single entry in 'struct ctl_table' that was modified at runtime
> for leaf ctl_table nodes and prevented sharing was 'parent'. This
> field was first introduces for selinux and then was used to implement
> sysctl_check_table. Selinux recently removed the need for this field:
> * http://thread.gmane.org/gmane.linux.kernel.lsm/12623
> * LKML-Reference: 1296519474-15714-1-git-send-email-lucian.grijincu@gmail.com
>
>
> Remove the need for 'parent' in sysctl_check_table and remove the
> 'parent' field:
>
>  [PATCH 1/5] sysctl: faster reimplementation of sysctl_check_table
>  [PATCH 2/5] sysctl: remove useless ctl_table->parent field
>
>
> Pave the way for sharing of ipv4/6 tables: allow data to be stored in
> the nodes above the leafs that will be shared:
>
>  [PATCH 3/5] sysctl: write ctl_table->extra2 to entries created from ctl_path
>
>
> Finally share the leaf sysctl tables for ipv4/ipv6:
>
>  [PATCH 4/5] ipv4: share sysctl net/ipv4/conf/DEVNAME/ tables
>  [PATCH 5/5] ipv6: share sysctl net/ipv6/conf/DEVNAME/ tables

Meh.

First you remove ->parent, then heroically pass "struct file *"
to sysctl handlers which duplicates all information already passed
and brings dcache into picture.

Binary sysctl rewrite confused you into thinking that d_name.name
is the way, but it isn't.
For binary sysctl(2) you wouldn't get d_name.name.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2011-02-04 11:53    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site