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

/* SPDX-License-Identifier: GPL-2.0 */
#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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
1da177e4 LT	2	#ifndef _LINUX_SHM_H_
	3	#define _LINUX_SHM_H_
	4
ab602f79	5	#include <linux/list.h>
1da177e4	6	#include <asm/page.h>
607ca46e	7	#include <uapi/linux/shm.h>
1da177e4	8	#include <asm/shmparam.h>
060028ba	9
1da177e4 LT	10	struct shmid_kernel /* private to the kernel */
	11	{
	12	struct kern_ipc_perm shm_perm;
239521f3	13	struct file *shm_file;
1da177e4 LT	14	unsigned long shm_nattch;
1da177e4 LT	15	unsigned long shm_segsz;
7ff2819e DD	16	time64_t shm_atim;
	17	time64_t shm_dtim;
	18	time64_t shm_ctim;
1da177e4 LT	19	pid_t shm_cprid;
	20	pid_t shm_lprid;
	21	struct user_struct *mlock_user;
5774ed01 VK	22
	23	/* The task created the shm object. NULL if the task is dead. */
	24	struct task_struct *shm_creator;
ab602f79	25	struct list_head shm_clist; /* list by creator */
3859a271	26	} __randomize_layout;
1da177e4 LT	27
	28	/* shm_mode upper byte flags */
	29	#define SHM_DEST 01000 /* segment will be destroyed on last detach */
	30	#define SHM_LOCKED 02000 /* segment will not be swapped */
42d7395f	31
1da177e4	32	#ifdef CONFIG_SYSVIPC
ab602f79 JM	33	struct sysv_shm {
	34	struct list_head shm_clist;
	35	};
	36
079a96ae WD	37	long do_shmat(int shmid, char __user shmaddr, int shmflg, unsigned long addr,
079a96ae WD	38	unsigned long shmlba);
2954e440	39	bool is_file_shm_hugepages(struct file *file);
ab602f79 JM	40	void exit_shm(struct task_struct *task);
ab602f79 JM	41	#define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
1da177e4	42	#else
ab602f79 JM	43	struct sysv_shm {
	44	/* empty */
	45	};
	46
1da177e4	47	static inline long do_shmat(int shmid, char __user *shmaddr,
079a96ae WD	48	int shmflg, unsigned long *addr,
079a96ae WD	49	unsigned long shmlba)
1da177e4 LT	50	{
	51	return -ENOSYS;
	52	}
2954e440	53	static inline bool is_file_shm_hugepages(struct file *file)
516dffdc	54	{
2954e440	55	return false;
516dffdc	56	}
b34a6b1d VK	57	static inline void exit_shm(struct task_struct *task)
	58	{
	59	}
ab602f79 JM	60	static inline void shm_init_task(struct task_struct *task)
	61	{
	62	}
1da177e4 LT	63	#endif
1da177e4 LT	64
1da177e4	65	#endif /* _LINUX_SHM_H_ */