[linux-block.git] / include / linux / umh.h

#ifndef __LINUX_UMH_H__
#define __LINUX_UMH_H__

#include <linux/gfp.h>
#include <linux/stddef.h>
#include <linux/errno.h>
#include <linux/compiler.h>
#include <linux/workqueue.h>
#include <linux/sysctl.h>

struct cred;
struct file;

#define UMH_NO_WAIT	0x00	/* don't wait at all */
#define UMH_WAIT_EXEC	0x01	/* wait for the exec, but not the process */
#define UMH_WAIT_PROC	0x02	/* wait for the process to complete */
#define UMH_KILLABLE	0x04	/* wait for EXEC/PROC killable */
#define UMH_FREEZABLE	0x08	/* wait for EXEC/PROC freezable */

struct subprocess_info {
	struct work_struct work;
	struct completion *complete;
	const char *path;
	char **argv;
	char **envp;
	int wait;
	int retval;
	int (*init)(struct subprocess_info *info, struct cred *new);
	void (*cleanup)(struct subprocess_info *info);
	void *data;
} __randomize_layout;

extern int
call_usermodehelper(const char *path, char **argv, char **envp, int wait);

extern struct subprocess_info *
call_usermodehelper_setup(const char *path, char **argv, char **envp,
			  gfp_t gfp_mask,
			  int (*init)(struct subprocess_info *info, struct cred *new),
			  void (*cleanup)(struct subprocess_info *), void *data);

extern int
call_usermodehelper_exec(struct subprocess_info *info, int wait);

extern struct ctl_table usermodehelper_table[];

enum umh_disable_depth {
	UMH_ENABLED = 0,
	UMH_FREEZING,
	UMH_DISABLED,
};

extern int __usermodehelper_disable(enum umh_disable_depth depth);
extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);

static inline int usermodehelper_disable(void)
{
	return __usermodehelper_disable(UMH_DISABLED);
}

static inline void usermodehelper_enable(void)
{
	__usermodehelper_set_disable_depth(UMH_ENABLED);
}

extern int usermodehelper_read_trylock(void);
extern long usermodehelper_read_lock_wait(long timeout);
extern void usermodehelper_read_unlock(void);

#endif /* __LINUX_UMH_H__ */
Commit	Line	Data
c1f3fa2a LR	1	#ifndef __LINUX_UMH_H__
	2	#define __LINUX_UMH_H__
	3
	4	#include <linux/gfp.h>
	5	#include <linux/stddef.h>
	6	#include <linux/errno.h>
	7	#include <linux/compiler.h>
	8	#include <linux/workqueue.h>
	9	#include <linux/sysctl.h>
	10
	11	struct cred;
	12	struct file;
	13
1fbcaa92 PZ	14	#define UMH_NO_WAIT 0x00 /* don't wait at all */
	15	#define UMH_WAIT_EXEC 0x01 /* wait for the exec, but not the process */
	16	#define UMH_WAIT_PROC 0x02 /* wait for the process to complete */
	17	#define UMH_KILLABLE 0x04 /* wait for EXEC/PROC killable */
	18	#define UMH_FREEZABLE 0x08 /* wait for EXEC/PROC freezable */
c1f3fa2a LR	19
	20	struct subprocess_info {
	21	struct work_struct work;
	22	struct completion *complete;
	23	const char *path;
	24	char **argv;
	25	char **envp;
	26	int wait;
	27	int retval;
	28	int (init)(struct subprocess_info info, struct cred *new);
	29	void (cleanup)(struct subprocess_info info);
	30	void *data;
	31	} __randomize_layout;
	32
	33	extern int
	34	call_usermodehelper(const char path, char argv, char *envp, int wait);
	35
	36	extern struct subprocess_info *
	37	call_usermodehelper_setup(const char path, char argv, char *envp,
	38	gfp_t gfp_mask,
	39	int (init)(struct subprocess_info info, struct cred *new),
	40	void (cleanup)(struct subprocess_info ), void *data);
	41
	42	extern int
	43	call_usermodehelper_exec(struct subprocess_info *info, int wait);
	44
	45	extern struct ctl_table usermodehelper_table[];
	46
	47	enum umh_disable_depth {
	48	UMH_ENABLED = 0,
	49	UMH_FREEZING,
	50	UMH_DISABLED,
	51	};
	52
	53	extern int __usermodehelper_disable(enum umh_disable_depth depth);
	54	extern void __usermodehelper_set_disable_depth(enum umh_disable_depth depth);
	55
	56	static inline int usermodehelper_disable(void)
	57	{
	58	return __usermodehelper_disable(UMH_DISABLED);
	59	}
	60
	61	static inline void usermodehelper_enable(void)
	62	{
	63	__usermodehelper_set_disable_depth(UMH_ENABLED);
	64	}
	65
	66	extern int usermodehelper_read_trylock(void);
	67	extern long usermodehelper_read_lock_wait(long timeout);
	68	extern void usermodehelper_read_unlock(void);
	69
	70	#endif /* __LINUX_UMH_H__ */