ia64/linux-2.6.18-xen.hg

view kernel/ksysfs.c @ 562:66faefe721eb

pvSCSI backend driver

Signed-off-by: Tomonari Horikoshi <t.horikoshi@jp.fujitsu.com>
Signed-off-by: Jun Kamada <kama@jp.fujitsu.com>
author Keir Fraser <keir.fraser@citrix.com>
date Mon Jun 02 09:58:27 2008 +0100 (2008-06-02)
parents 831230e53067
children
line source
1 /*
2 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
3 * are not related to any other subsystem
4 *
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 *
7 * This file is release under the GPLv2
8 *
9 */
11 #include <linux/kobject.h>
12 #include <linux/string.h>
13 #include <linux/sysfs.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/kexec.h>
18 #define KERNEL_ATTR_RO(_name) \
19 static struct subsys_attribute _name##_attr = __ATTR_RO(_name)
21 #define KERNEL_ATTR_RW(_name) \
22 static struct subsys_attribute _name##_attr = \
23 __ATTR(_name, 0644, _name##_show, _name##_store)
25 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
26 /* current uevent sequence number */
27 static ssize_t uevent_seqnum_show(struct subsystem *subsys, char *page)
28 {
29 return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum);
30 }
31 KERNEL_ATTR_RO(uevent_seqnum);
33 /* uevent helper program, used during early boo */
34 static ssize_t uevent_helper_show(struct subsystem *subsys, char *page)
35 {
36 return sprintf(page, "%s\n", uevent_helper);
37 }
38 static ssize_t uevent_helper_store(struct subsystem *subsys, const char *page, size_t count)
39 {
40 if (count+1 > UEVENT_HELPER_PATH_LEN)
41 return -ENOENT;
42 memcpy(uevent_helper, page, count);
43 uevent_helper[count] = '\0';
44 if (count && uevent_helper[count-1] == '\n')
45 uevent_helper[count-1] = '\0';
46 return count;
47 }
48 KERNEL_ATTR_RW(uevent_helper);
49 #endif
51 #ifdef CONFIG_KEXEC
52 static ssize_t kexec_loaded_show(struct subsystem *subsys, char *page)
53 {
54 return sprintf(page, "%d\n", !!kexec_image);
55 }
56 KERNEL_ATTR_RO(kexec_loaded);
58 static ssize_t kexec_crash_loaded_show(struct subsystem *subsys, char *page)
59 {
60 return sprintf(page, "%d\n", !!kexec_crash_image);
61 }
62 KERNEL_ATTR_RO(kexec_crash_loaded);
63 #endif /* CONFIG_KEXEC */
65 decl_subsys(kernel, NULL, NULL);
66 EXPORT_SYMBOL_GPL(kernel_subsys);
68 static struct attribute * kernel_attrs[] = {
69 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
70 &uevent_seqnum_attr.attr,
71 &uevent_helper_attr.attr,
72 #endif
73 #ifdef CONFIG_KEXEC
74 &kexec_loaded_attr.attr,
75 &kexec_crash_loaded_attr.attr,
76 #endif
77 NULL
78 };
80 static struct attribute_group kernel_attr_group = {
81 .attrs = kernel_attrs,
82 };
84 static int __init ksysfs_init(void)
85 {
86 int error = subsystem_register(&kernel_subsys);
87 if (!error)
88 error = sysfs_create_group(&kernel_subsys.kset.kobj,
89 &kernel_attr_group);
91 return error;
92 }
94 core_initcall(ksysfs_init);