1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/list.h>
7 #include <uapi/linux/shm.h>
8 #include <asm/shmparam.h>
10 struct shmid_kernel /* private to the kernel */
12 struct kern_ipc_perm shm_perm;
13 struct file *shm_file;
14 unsigned long shm_nattch;
15 unsigned long shm_segsz;
21 struct user_struct *mlock_user;
24 * The task created the shm object, for
25 * task_lock(shp->shm_creator)
27 struct task_struct *shm_creator;
30 * List by creator. task_lock(->shm_creator) required for read/write.
31 * If list_empty(), then the creator is dead already.
33 struct list_head shm_clist;
34 struct ipc_namespace *ns;
37 /* shm_mode upper byte flags */
38 #define SHM_DEST 01000 /* segment will be destroyed on last detach */
39 #define SHM_LOCKED 02000 /* segment will not be swapped */
43 struct list_head shm_clist;
46 long do_shmat(int shmid, char __user *shmaddr, int shmflg, unsigned long *addr,
47 unsigned long shmlba);
48 bool is_file_shm_hugepages(struct file *file);
49 void exit_shm(struct task_struct *task);
50 #define shm_init_task(task) INIT_LIST_HEAD(&(task)->sysvshm.shm_clist)
56 static inline long do_shmat(int shmid, char __user *shmaddr,
57 int shmflg, unsigned long *addr,
62 static inline bool is_file_shm_hugepages(struct file *file)
66 static inline void exit_shm(struct task_struct *task)
69 static inline void shm_init_task(struct task_struct *task)
74 #endif /* _LINUX_SHM_H_ */