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author | Eric W. Biederman <ebiederm@xmission.com> | 2007-02-14 00:33:58 -0800 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-14 08:09:58 -0800 |
commit | 39732acd968a007036ff3c504f1e6748024ef548 (patch) | |
tree | 91d3ecdd8579559daa6b9d4b25eb688d1bb909a8 /kernel/utsname_sysctl.c | |
parent | b04c3afb2b6e2f902b41bb62b73684d92d7e6c34 (diff) | |
download | kernel_samsung_tuna-39732acd968a007036ff3c504f1e6748024ef548.zip kernel_samsung_tuna-39732acd968a007036ff3c504f1e6748024ef548.tar.gz kernel_samsung_tuna-39732acd968a007036ff3c504f1e6748024ef548.tar.bz2 |
[PATCH] sysctl: move utsname sysctls to their own file
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>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/utsname_sysctl.c')
-rw-r--r-- | kernel/utsname_sysctl.c | 146 |
1 files changed, 146 insertions, 0 deletions
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); |