[mirror_ubuntu-bionic-kernel.git] / include / linux / shm.h

#ifndef _LINUX_SHM_H_
#define _LINUX_SHM_H_

#include <linux/list.h>
#include <asm/page.h>
#include <uapi/linux/shm.h>
#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;
	time64_t		shm_atim;
	time64_t		shm_dtim;
	time64_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;
	struct list_head	shm_clist;	/* list by creator */
} __randomize_layout;

/* 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 */

#ifdef CONFIG_SYSVIPC
struct sysv_shm {
	struct list_head shm_clist;
};

long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
	      unsigned long shmlba);
bool is_file_shm_hugepages(struct file *file);
void exit_shm(struct task_struct *task);
#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
#else
struct sysv_shm {
	/* empty */
};

static inline long do_shmat(int shmid, char __user *shmaddr,
			    int shmflg, unsigned long *addr,
			    unsigned long shmlba)
{
	return -ENOSYS;
}
static inline bool is_file_shm_hugepages(struct file *file)
{
	return false;
}
static inline void exit_shm(struct task_struct *task)
{
}
static inline void shm_init_task(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
ab602f79	4	#include <linux/list.h>
1da177e4	5	#include <asm/page.h>
607ca46e	6	#include <uapi/linux/shm.h>
1da177e4	7	#include <asm/shmparam.h>
060028ba	8
1da177e4 LT	9	struct shmid_kernel /* private to the kernel */
	10	{
	11	struct kern_ipc_perm shm_perm;
239521f3	12	struct file *shm_file;
1da177e4 LT	13	unsigned long shm_nattch;
1da177e4 LT	14	unsigned long shm_segsz;
7ff2819e DD	15	time64_t shm_atim;
	16	time64_t shm_dtim;
	17	time64_t shm_ctim;
1da177e4 LT	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;
ab602f79	24	struct list_head shm_clist; /* list by creator */
3859a271	25	} __randomize_layout;
1da177e4 LT	26
	27	/* shm_mode upper byte flags */
	28	#define SHM_DEST 01000 /* segment will be destroyed on last detach */
	29	#define SHM_LOCKED 02000 /* segment will not be swapped */
42d7395f	30
1da177e4	31	#ifdef CONFIG_SYSVIPC
ab602f79 JM	32	struct sysv_shm {
	33	struct list_head shm_clist;
	34	};
	35
079a96ae WD	36	long do_shmat(int shmid, char __user shmaddr, int shmflg, unsigned long addr,
079a96ae WD	37	unsigned long shmlba);
2954e440	38	bool is_file_shm_hugepages(struct file *file);
ab602f79 JM	39	void exit_shm(struct task_struct *task);
ab602f79 JM	40	#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
1da177e4	41	#else
ab602f79 JM	42	struct sysv_shm {
	43	/* empty */
	44	};
	45
1da177e4	46	static inline long do_shmat(int shmid, char __user *shmaddr,
079a96ae WD	47	int shmflg, unsigned long *addr,
079a96ae WD	48	unsigned long shmlba)
1da177e4 LT	49	{
	50	return -ENOSYS;
	51	}
2954e440	52	static inline bool is_file_shm_hugepages(struct file *file)
516dffdc	53	{
2954e440	54	return false;
516dffdc	55	}
b34a6b1d VK	56	static inline void exit_shm(struct task_struct *task)
	57	{
	58	}
ab602f79 JM	59	static inline void shm_init_task(struct task_struct *task)
	60	{
	61	}
1da177e4 LT	62	#endif
1da177e4 LT	63
1da177e4	64	#endif /* _LINUX_SHM_H_ */