]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - include/linux/kmod.h
Merge tag 'v3.2-rc2' into staging/for_v3.3
[mirror_ubuntu-artful-kernel.git] / include / linux / kmod.h
CommitLineData
1da177e4
LT
1#ifndef __LINUX_KMOD_H__
2#define __LINUX_KMOD_H__
3
4/*
5 * include/linux/kmod.h
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
ac331d15 22#include <linux/gfp.h>
7888e7ff 23#include <linux/stddef.h>
1da177e4
LT
24#include <linux/errno.h>
25#include <linux/compiler.h>
a06a4dc3 26#include <linux/workqueue.h>
17f60a7d 27#include <linux/sysctl.h>
1da177e4
LT
28
29#define KMOD_PATH_LEN 256
30
a1ef5adb 31#ifdef CONFIG_MODULES
5ed10910 32extern char modprobe_path[]; /* for sysctl */
1da177e4
LT
33/* modprobe exit status on success, -ve on error. Return value
34 * usually useless though. */
b9075fa9
JP
35extern __printf(2, 3)
36int __request_module(bool wait, const char *name, ...);
acae0515
AV
37#define request_module(mod...) __request_module(true, mod)
38#define request_module_nowait(mod...) __request_module(false, mod)
39#define try_then_request_module(x, mod...) \
97c18e2c 40 ((x) ?: (__request_module(true, mod), (x)))
1da177e4 41#else
acae0515
AV
42static inline int request_module(const char *name, ...) { return -ENOSYS; }
43static inline int request_module_nowait(const char *name, ...) { return -ENOSYS; }
df648c9f 44#define try_then_request_module(x, mod...) (x)
1da177e4
LT
45#endif
46
7888e7ff 47
87966996 48struct cred;
0ab4dc92 49struct file;
a06a4dc3
NH
50
51enum umh_wait {
52 UMH_NO_WAIT = -1, /* don't wait at all */
53 UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
54 UMH_WAIT_PROC = 1, /* wait for the process to complete */
55};
56
57struct subprocess_info {
58 struct work_struct work;
59 struct completion *complete;
a06a4dc3
NH
60 char *path;
61 char **argv;
62 char **envp;
63 enum umh_wait wait;
64 int retval;
87966996 65 int (*init)(struct subprocess_info *info, struct cred *new);
a06a4dc3
NH
66 void (*cleanup)(struct subprocess_info *info);
67 void *data;
68};
0ab4dc92
JF
69
70/* Allocate a subprocess_info structure */
ac331d15
KM
71struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
72 char **envp, gfp_t gfp_mask);
0ab4dc92
JF
73
74/* Set various pieces of state into the subprocess_info structure */
a06a4dc3 75void call_usermodehelper_setfns(struct subprocess_info *info,
87966996 76 int (*init)(struct subprocess_info *info, struct cred *new),
a06a4dc3
NH
77 void (*cleanup)(struct subprocess_info *info),
78 void *data);
86313c48 79
0ab4dc92 80/* Actually execute the sub-process */
86313c48 81int call_usermodehelper_exec(struct subprocess_info *info, enum umh_wait wait);
0ab4dc92
JF
82
83/* Free the subprocess_info. This is only needed if you're not going
84 to call call_usermodehelper_exec */
85void call_usermodehelper_freeinfo(struct subprocess_info *info);
7888e7ff
DH
86
87static inline int
a06a4dc3
NH
88call_usermodehelper_fns(char *path, char **argv, char **envp,
89 enum umh_wait wait,
87966996 90 int (*init)(struct subprocess_info *info, struct cred *new),
a06a4dc3 91 void (*cleanup)(struct subprocess_info *), void *data)
7888e7ff 92{
0ab4dc92 93 struct subprocess_info *info;
ac331d15 94 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
0ab4dc92 95
ac331d15 96 info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
a06a4dc3 97
0ab4dc92
JF
98 if (info == NULL)
99 return -ENOMEM;
a06a4dc3
NH
100
101 call_usermodehelper_setfns(info, init, cleanup, data);
102
0ab4dc92
JF
103 return call_usermodehelper_exec(info, wait);
104}
105
a06a4dc3
NH
106static inline int
107call_usermodehelper(char *path, char **argv, char **envp, enum umh_wait wait)
108{
109 return call_usermodehelper_fns(path, argv, envp, wait,
110 NULL, NULL, NULL);
111}
112
17f60a7d
EP
113extern struct ctl_table usermodehelper_table[];
114
1da177e4
LT
115extern void usermodehelper_init(void);
116
1bfcf130
RW
117extern int usermodehelper_disable(void);
118extern void usermodehelper_enable(void);
a144c6a6 119extern bool usermodehelper_is_disabled(void);
1bfcf130 120
1da177e4 121#endif /* __LINUX_KMOD_H__ */