[deliverable/linux.git] / include / linux / shm.h

#ifndef _LINUX_SHM_H_
#define _LINUX_SHM_H_

#include <asm/page.h>
#include <uapi/linux/shm.h>

#define SHMALL (SHMMAX/PAGE_SIZE*(SHMMNI/16)) /* max shm system wide (pages) */
#include <asm/shmparam.h>
struct shmid_kernel /* private to the kernel */
{	
	struct kern_ipc_perm	shm_perm;
	struct file *		shm_file;
	unsigned long		shm_nattch;
	unsigned long		shm_segsz;
	time_t			shm_atim;
	time_t			shm_dtim;
	time_t			shm_ctim;
	pid_t			shm_cprid;
	pid_t			shm_lprid;
	struct user_struct	*mlock_user;

	/* The task created the shm object.  NULL if the task is dead. */
	struct task_struct	*shm_creator;
};

/* shm_mode upper byte flags */
#define	SHM_DEST	01000	/* segment will be destroyed on last detach */
#define SHM_LOCKED      02000   /* segment will not be swapped */
#define SHM_HUGETLB     04000   /* segment will use huge TLB pages */
#define SHM_NORESERVE   010000  /* don't check for reservations */

#ifdef CONFIG_SYSVIPC
long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
	      unsigned long shmlba);
extern int is_file_shm_hugepages(struct file *file);
extern void exit_shm(struct task_struct *task);
#else
static inline long do_shmat(int shmid, char __user *shmaddr,
			    int shmflg, unsigned long *addr,
			    unsigned long shmlba)
{
	return -ENOSYS;
}
static inline int is_file_shm_hugepages(struct file *file)
{
	return 0;
}
static inline void exit_shm(struct task_struct *task)
{
}
#endif

#endif /* _LINUX_SHM_H_ */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_SHM_H_
	2	#define _LINUX_SHM_H_
	3
1da177e4	4	#include <asm/page.h>
607ca46e	5	#include <uapi/linux/shm.h>
1da177e4	6
1da177e4	7	#define SHMALL (SHMMAX/PAGE_SIZE(SHMMNI/16)) / max shm system wide (pages) */
1da177e4	8	#include <asm/shmparam.h>
1da177e4 LT	9	struct shmid_kernel /* private to the kernel */
	10	{
	11	struct kern_ipc_perm shm_perm;
	12	struct file * shm_file;
1da177e4 LT	13	unsigned long shm_nattch;
	14	unsigned long shm_segsz;
	15	time_t shm_atim;
	16	time_t shm_dtim;
	17	time_t shm_ctim;
	18	pid_t shm_cprid;
	19	pid_t shm_lprid;
	20	struct user_struct *mlock_user;
5774ed01 VK	21
	22	/* The task created the shm object. NULL if the task is dead. */
	23	struct task_struct *shm_creator;
1da177e4 LT	24	};
	25
	26	/* shm_mode upper byte flags */
	27	#define SHM_DEST 01000 /* segment will be destroyed on last detach */
	28	#define SHM_LOCKED 02000 /* segment will not be swapped */
	29	#define SHM_HUGETLB 04000 /* segment will use huge TLB pages */
bf8f972d	30	#define SHM_NORESERVE 010000 /* don't check for reservations */
1da177e4 LT	31
1da177e4 LT	32	#ifdef CONFIG_SYSVIPC
079a96ae WD	33	long do_shmat(int shmid, char __user shmaddr, int shmflg, unsigned long addr,
079a96ae WD	34	unsigned long shmlba);
516dffdc	35	extern int is_file_shm_hugepages(struct file *file);
b34a6b1d	36	extern void exit_shm(struct task_struct *task);
1da177e4 LT	37	#else
1da177e4 LT	38	static inline long do_shmat(int shmid, char __user *shmaddr,
079a96ae WD	39	int shmflg, unsigned long *addr,
079a96ae WD	40	unsigned long shmlba)
1da177e4 LT	41	{
	42	return -ENOSYS;
	43	}
516dffdc AL	44	static inline int is_file_shm_hugepages(struct file *file)
	45	{
	46	return 0;
	47	}
b34a6b1d VK	48	static inline void exit_shm(struct task_struct *task)
	49	{
	50	}
1da177e4 LT	51	#endif
1da177e4 LT	52
1da177e4	53	#endif /* _LINUX_SHM_H_ */