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[PATCH 50/59] sysctl: Move utsname sysctls to their own file

To: "<Andrew Morton" <akpm@osdl.org>
Subject: [PATCH 50/59] sysctl: Move utsname sysctls to their own file
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Tue, 16 Jan 2007 09:39:55 -0700
Cc: <linux-kernel@vger.kernel.org>, <containers@lists.osdl.org>, <netdev@vger.kernel.org>, xfs-masters@oss.sgi.com, xfs@oss.sgi.com, linux-scsi@vger.kernel.org, James.Bottomley@SteelEye.com, minyard@acm.org, openipmi-developer@lists.sourceforge.net, <tony.luck@intel.com>, linux-mips@linux-mips.org, ralf@linux-mips.org, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, linux390@de.ibm.com, linux-390@vm.marist.edu, paulus@samba.org, linuxppc-dev@ozlabs.org, lethal@linux-sh.org, linuxsh-shmedia-dev@lists.sourceforge.net, <ak@suse.de>, vojtech@suse.cz, clemens@ladisch.de, a.zummo@towertech.it, rtc-linux@googlegroups.com, linux-parport@lists.infradead.org, andrea@suse.de, tim@cyberelk.net, philb@gnu.org, aharkes@cs.cmu.edu, coda@cs.cmu.edu, codalist@TELEMANN.coda.cs.cmu.edu, aia21@cantab.net, linux-ntfs-dev@lists.sourceforge.net, mark.fasheh@oracle.com, kurt.hackel@oracle.com, "Eric W. Biederman" <ebiederm@xmission.com>
In-reply-to: <m1ac0jc4no.fsf@ebiederm.dsl.xmission.com>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <m1ac0jc4no.fsf@ebiederm.dsl.xmission.com>
Sender: linux-mips-bounce@linux-mips.org
From: Eric W. Biederman <ebiederm@xmission.com> - unquoted

This is just a simple cleanup to keep kernel/sysctl.c
from getting to crowded with special cases, and by
keeping all of the utsname logic to together it makes
the code a little more readable.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 kernel/Makefile         |    1 +
 kernel/sysctl.c         |  115 -------------------------------------
 kernel/utsname_sysctl.c |  146 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 147 insertions(+), 115 deletions(-)

diff --git a/kernel/Makefile b/kernel/Makefile
index 14f4d45..d286c44 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_SECCOMP) += seccomp.o
 obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
 obj-$(CONFIG_RELAY) += relay.o
 obj-$(CONFIG_UTS_NS) += utsname.o
+obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 7420761..a8c0a03 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -135,13 +135,6 @@ static int parse_table(int __user *, int, void __user *, 
size_t __user *,
                void __user *, size_t, ctl_table *);
 #endif
 
-static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
-                 void __user *buffer, size_t *lenp, loff_t *ppos);
-
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
-                 void __user *oldval, size_t __user *oldlenp,
-                 void __user *newval, size_t newlen);
-
 #ifdef CONFIG_SYSVIPC
 static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
                  void __user *oldval, size_t __user *oldlenp,
@@ -174,27 +167,6 @@ extern ctl_table inotify_table[];
 int sysctl_legacy_va_layout;
 #endif
 
-static void *get_uts(ctl_table *table, int write)
-{
-       char *which = table->data;
-#ifdef CONFIG_UTS_NS
-       struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
-       which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
-#endif
-       if (!write)
-               down_read(&uts_sem);
-       else
-               down_write(&uts_sem);
-       return which;
-}
-
-static void put_uts(ctl_table *table, int write, void *which)
-{
-       if (!write)
-               up_read(&uts_sem);
-       else
-               up_write(&uts_sem);
-}
 
 #ifdef CONFIG_SYSVIPC
 static void *get_ipc(ctl_table *table, int write)
@@ -275,51 +247,6 @@ static ctl_table root_table[] = {
 
 static ctl_table kern_table[] = {
        {
-               .ctl_name       = KERN_OSTYPE,
-               .procname       = "ostype",
-               .data           = init_uts_ns.name.sysname,
-               .maxlen         = sizeof(init_uts_ns.name.sysname),
-               .mode           = 0444,
-               .proc_handler   = &proc_do_uts_string,
-               .strategy       = &sysctl_uts_string,
-       },
-       {
-               .ctl_name       = KERN_OSRELEASE,
-               .procname       = "osrelease",
-               .data           = init_uts_ns.name.release,
-               .maxlen         = sizeof(init_uts_ns.name.release),
-               .mode           = 0444,
-               .proc_handler   = &proc_do_uts_string,
-               .strategy       = &sysctl_uts_string,
-       },
-       {
-               .ctl_name       = KERN_VERSION,
-               .procname       = "version",
-               .data           = init_uts_ns.name.version,
-               .maxlen         = sizeof(init_uts_ns.name.version),
-               .mode           = 0444,
-               .proc_handler   = &proc_do_uts_string,
-               .strategy       = &sysctl_uts_string,
-       },
-       {
-               .ctl_name       = KERN_NODENAME,
-               .procname       = "hostname",
-               .data           = init_uts_ns.name.nodename,
-               .maxlen         = sizeof(init_uts_ns.name.nodename),
-               .mode           = 0644,
-               .proc_handler   = &proc_do_uts_string,
-               .strategy       = &sysctl_uts_string,
-       },
-       {
-               .ctl_name       = KERN_DOMAINNAME,
-               .procname       = "domainname",
-               .data           = init_uts_ns.name.domainname,
-               .maxlen         = sizeof(init_uts_ns.name.domainname),
-               .mode           = 0644,
-               .proc_handler   = &proc_do_uts_string,
-               .strategy       = &sysctl_uts_string,
-       },
-       {
                .ctl_name       = KERN_PANIC,
                .procname       = "panic",
                .data           = &panic_timeout,
@@ -1746,21 +1673,6 @@ int proc_dostring(ctl_table *table, int write, struct 
file *filp,
                               buffer, lenp, ppos);
 }
 
-/*
- *     Special case of dostring for the UTS structure. This has locks
- *     to observe. Should this be in kernel/sys.c ????
- */
-
-static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
-                 void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-       int r;
-       void *which;
-       which = get_uts(table, write);
-       r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
-       put_uts(table, write, which);
-       return r;
-}
 
 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
                                 int *valp,
@@ -2379,12 +2291,6 @@ int proc_dostring(ctl_table *table, int write, struct 
file *filp,
        return -ENOSYS;
 }
 
-static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
-               void __user *buffer, size_t *lenp, loff_t *ppos)
-{
-       return -ENOSYS;
-}
-
 #ifdef CONFIG_SYSVIPC
 static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
                void __user *buffer, size_t *lenp, loff_t *ppos)
@@ -2602,21 +2508,6 @@ int sysctl_ms_jiffies(ctl_table *table, int __user 
*name, int nlen,
 }
 
 
-/* The generic string strategy routine: */
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
-                 void __user *oldval, size_t __user *oldlenp,
-                 void __user *newval, size_t newlen)
-{
-       struct ctl_table uts_table;
-       int r, write;
-       write = newval && newlen;
-       memcpy(&uts_table, table, sizeof(uts_table));
-       uts_table.data = get_uts(table, write);
-       r = sysctl_string(&uts_table, name, nlen,
-               oldval, oldlenp, newval, newlen);
-       put_uts(table, write, uts_table.data);
-       return r;
-}
 
 #ifdef CONFIG_SYSVIPC
 /* The generic sysctl ipc data routine. */
@@ -2723,12 +2614,6 @@ int sysctl_ms_jiffies(ctl_table *table, int __user 
*name, int nlen,
        return -ENOSYS;
 }
 
-static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
-                 void __user *oldval, size_t __user *oldlenp,
-                 void __user *newval, size_t newlen)
-{
-       return -ENOSYS;
-}
 static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
                void __user *oldval, size_t __user *oldlenp,
                void __user *newval, size_t newlen)
diff --git a/kernel/utsname_sysctl.c b/kernel/utsname_sysctl.c
new file mode 100644
index 0000000..324aa13
--- /dev/null
+++ b/kernel/utsname_sysctl.c
@@ -0,0 +1,146 @@
+/*
+ *  Copyright (C) 2007
+ *
+ *  Author: Eric Biederman <ebiederm@xmision.com>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License as
+ *  published by the Free Software Foundation, version 2 of the
+ *  License.
+ */
+
+#include <linux/module.h>
+#include <linux/uts.h>
+#include <linux/utsname.h>
+#include <linux/version.h>
+#include <linux/sysctl.h>
+
+static void *get_uts(ctl_table *table, int write)
+{
+       char *which = table->data;
+#ifdef CONFIG_UTS_NS
+       struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
+       which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
+#endif
+       if (!write)
+               down_read(&uts_sem);
+       else
+               down_write(&uts_sem);
+       return which;
+}
+
+static void put_uts(ctl_table *table, int write, void *which)
+{
+       if (!write)
+               up_read(&uts_sem);
+       else
+               up_write(&uts_sem);
+}
+
+#ifdef CONFIG_PROC_FS
+/*
+ *     Special case of dostring for the UTS structure. This has locks
+ *     to observe. Should this be in kernel/sys.c ????
+ */
+static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
+                 void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+       struct ctl_table uts_table;
+       int r;
+       memcpy(&uts_table, table, sizeof(uts_table));
+       uts_table.data = get_uts(table, write);
+       r = proc_dostring(&uts_table,write,filp,buffer,lenp, ppos);
+       put_uts(table, write, uts_table.data);
+       return r;
+}
+#else
+#define proc_do_uts_string NULL
+#endif
+
+
+#ifdef CONFIG_SYSCTL_SYSCALL
+/* The generic string strategy routine: */
+static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
+                 void __user *oldval, size_t __user *oldlenp,
+                 void __user *newval, size_t newlen)
+{
+       struct ctl_table uts_table;
+       int r, write;
+       write = newval && newlen;
+       memcpy(&uts_table, table, sizeof(uts_table));
+       uts_table.data = get_uts(table, write);
+       r = sysctl_string(&uts_table, name, nlen,
+               oldval, oldlenp, newval, newlen);
+       put_uts(table, write, uts_table.data);
+       return r;
+}
+#else
+#define sysctl_uts_string NULL
+#endif
+
+static struct ctl_table uts_kern_table[] = {
+       {
+               .ctl_name       = KERN_OSTYPE,
+               .procname       = "ostype",
+               .data           = init_uts_ns.name.sysname,
+               .maxlen         = sizeof(init_uts_ns.name.sysname),
+               .mode           = 0444,
+               .proc_handler   = proc_do_uts_string,
+               .strategy       = sysctl_uts_string,
+       },
+       {
+               .ctl_name       = KERN_OSRELEASE,
+               .procname       = "osrelease",
+               .data           = init_uts_ns.name.release,
+               .maxlen         = sizeof(init_uts_ns.name.release),
+               .mode           = 0444,
+               .proc_handler   = proc_do_uts_string,
+               .strategy       = sysctl_uts_string,
+       },
+       {
+               .ctl_name       = KERN_VERSION,
+               .procname       = "version",
+               .data           = init_uts_ns.name.version,
+               .maxlen         = sizeof(init_uts_ns.name.version),
+               .mode           = 0444,
+               .proc_handler   = proc_do_uts_string,
+               .strategy       = sysctl_uts_string,
+       },
+       {
+               .ctl_name       = KERN_NODENAME,
+               .procname       = "hostname",
+               .data           = init_uts_ns.name.nodename,
+               .maxlen         = sizeof(init_uts_ns.name.nodename),
+               .mode           = 0644,
+               .proc_handler   = proc_do_uts_string,
+               .strategy       = sysctl_uts_string,
+       },
+       {
+               .ctl_name       = KERN_DOMAINNAME,
+               .procname       = "domainname",
+               .data           = init_uts_ns.name.domainname,
+               .maxlen         = sizeof(init_uts_ns.name.domainname),
+               .mode           = 0644,
+               .proc_handler   = proc_do_uts_string,
+               .strategy       = sysctl_uts_string,
+       },
+       {}
+};
+
+static struct ctl_table uts_root_table[] = {
+       {
+               .ctl_name       = CTL_KERN,
+               .procname       = "kernel",
+               .mode           = 0555,
+               .child          = uts_kern_table,
+       },
+       {}
+};
+
+static int __init utsname_sysctl_init(void)
+{
+       register_sysctl_table(uts_root_table, 0);
+       return 0;
+}
+
+__initcall(utsname_sysctl_init);
-- 
1.4.4.1.g278f


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