49 	struct ipc_namespace *ns;  member
59 #define shm_ids(ns)	((ns)->ids[IPC_SHM_IDS])  argument
67 static void shm_destroy (struct ipc_namespace *ns, struct shmid_kernel *shp);
72 void shm_init_ns(struct ipc_namespace *ns)  in shm_init_ns()  argument
74 	ns->shm_ctlmax = SHMMAX;  in shm_init_ns()
75 	ns->shm_ctlall = SHMALL;  in shm_init_ns()
76 	ns->shm_ctlmni = SHMMNI;  in shm_init_ns()
77 	ns->shm_rmid_forced = 0;  in shm_init_ns()
78 	ns->shm_tot = 0;  in shm_init_ns()
79 	ipc_init_ids(&shm_ids(ns));  in shm_init_ns()
86 static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)  in do_shm_rmid()  argument
97 		shm_destroy(ns, shp);  in do_shm_rmid()
101 void shm_exit_ns(struct ipc_namespace *ns)  in shm_exit_ns()  argument
103 	free_ipcs(ns, &shm_ids(ns), do_shm_rmid);  in shm_exit_ns()
104 	idr_destroy(&ns->ids[IPC_SHM_IDS].ipcs_idr);  in shm_exit_ns()
131 static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)  in shm_lock()  argument
133 	struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);  in shm_lock()
147 static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns,  in shm_lock_check()  argument
150 	struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id);  in shm_lock_check()
167 static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)  in shm_rmid()  argument
169 	ipc_rmid(&shm_ids(ns), &s->shm_perm);  in shm_rmid()
180 	shp = shm_lock(sfd->ns, sfd->id);  in shm_open()
197 static void shm_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)  in shm_destroy()  argument
199 	ns->shm_tot -= (shp->shm_segsz + PAGE_SIZE - 1) >> PAGE_SHIFT;  in shm_destroy()
200 	shm_rmid(ns, shp);  in shm_destroy()
221 static bool shm_may_destroy(struct ipc_namespace *ns, struct shmid_kernel *shp)  in shm_may_destroy()  argument
224 	       (ns->shm_rmid_forced ||  in shm_may_destroy()
239 	struct ipc_namespace *ns = sfd->ns;  in shm_close()  local
241 	down_write(&shm_ids(ns).rw_mutex);  in shm_close()
243 	shp = shm_lock(ns, sfd->id);  in shm_close()
248 	if (shm_may_destroy(ns, shp))  in shm_close()
249 		shm_destroy(ns, shp);  in shm_close()
252 	up_write(&shm_ids(ns).rw_mutex);  in shm_close()
258 	struct ipc_namespace *ns = data;  in shm_try_destroy_current()  local
276 	if (!ns->shm_rmid_forced)  in shm_try_destroy_current()
279 	if (shm_may_destroy(ns, shp)) {  in shm_try_destroy_current()
281 		shm_destroy(ns, shp);  in shm_try_destroy_current()
289 	struct ipc_namespace *ns = data;  in shm_try_destroy_orphaned()  local
302 	if (shm_may_destroy(ns, shp)) {  in shm_try_destroy_orphaned()
304 		shm_destroy(ns, shp);  in shm_try_destroy_orphaned()
309 void shm_destroy_orphaned(struct ipc_namespace *ns)  in shm_destroy_orphaned()  argument
311 	down_write(&shm_ids(ns).rw_mutex);  in shm_destroy_orphaned()
312 	if (shm_ids(ns).in_use)  in shm_destroy_orphaned()
313 		idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_orphaned, ns);  in shm_destroy_orphaned()
314 	up_write(&shm_ids(ns).rw_mutex);  in shm_destroy_orphaned()
320 	struct ipc_namespace *ns = task->nsproxy->ipc_ns;  in exit_shm()  local
322 	if (shm_ids(ns).in_use == 0)  in exit_shm()
326 	down_write(&shm_ids(ns).rw_mutex);  in exit_shm()
327 	if (shm_ids(ns).in_use)  in exit_shm()
328 		idr_for_each(&shm_ids(ns).ipcs_idr, &shm_try_destroy_current, ns);  in exit_shm()
329 	up_write(&shm_ids(ns).rw_mutex);  in exit_shm()
389 	put_ipc_ns(sfd->ns);  in shm_release()
466 static int newseg(struct ipc_namespace *ns, struct ipc_params *params)  in newseg()  argument
479 	if (size < SHMMIN || size > ns->shm_ctlmax)  in newseg()
482 	if (ns->shm_tot + numpages > ns->shm_ctlall)  in newseg()
541 	id = ipc_addid(&shm_ids(ns), &shp->shm_perm, ns->shm_ctlmni);  in newseg()
553 	ns->shm_tot += numpages;  in newseg()
595 	struct ipc_namespace *ns;  in SYSCALL_DEFINE3()  local
599 	ns = current->nsproxy->ipc_ns;  in SYSCALL_DEFINE3()
609 	return ipcget(ns, &shm_ids(ns), &shm_ops, &shm_params);  in SYSCALL_DEFINE3()
721 static void shm_get_stat(struct ipc_namespace *ns, unsigned long *rss,  in shm_get_stat()  argument
730 	in_use = shm_ids(ns).in_use;  in shm_get_stat()
736 		ipc = idr_find(&shm_ids(ns).ipcs_idr, next_id);  in shm_get_stat()
752 static int shmctl_down(struct ipc_namespace *ns, int shmid, int cmd,  in shmctl_down()  argument
765 	ipcp = ipcctl_pre_down(ns, &shm_ids(ns), shmid, cmd,  in shmctl_down()
777 		do_shm_rmid(ns, ipcp);  in shmctl_down()
791 	up_write(&shm_ids(ns).rw_mutex);  in shmctl_down()
799 	struct ipc_namespace *ns;  in SYSCALL_DEFINE3()  local
807 	ns = current->nsproxy->ipc_ns;  in SYSCALL_DEFINE3()
819 		shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;  in SYSCALL_DEFINE3()
820 		shminfo.shmmax = ns->shm_ctlmax;  in SYSCALL_DEFINE3()
821 		shminfo.shmall = ns->shm_ctlall;  in SYSCALL_DEFINE3()
827 		down_read(&shm_ids(ns).rw_mutex);  in SYSCALL_DEFINE3()
828 		err = ipc_get_maxid(&shm_ids(ns));  in SYSCALL_DEFINE3()
829 		up_read(&shm_ids(ns).rw_mutex);  in SYSCALL_DEFINE3()
844 		down_read(&shm_ids(ns).rw_mutex);  in SYSCALL_DEFINE3()
845 		shm_info.used_ids = shm_ids(ns).in_use;  in SYSCALL_DEFINE3()
846 		shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);  in SYSCALL_DEFINE3()
847 		shm_info.shm_tot = ns->shm_tot;  in SYSCALL_DEFINE3()
850 		err = ipc_get_maxid(&shm_ids(ns));  in SYSCALL_DEFINE3()
851 		up_read(&shm_ids(ns).rw_mutex);  in SYSCALL_DEFINE3()
867 			shp = shm_lock(ns, shmid);  in SYSCALL_DEFINE3()
874 			shp = shm_lock_check(ns, shmid);  in SYSCALL_DEFINE3()
882 		if (ipcperms(ns, &shp->shm_perm, S_IRUGO))  in SYSCALL_DEFINE3()
908 		shp = shm_lock_check(ns, shmid);  in SYSCALL_DEFINE3()
916 		if (!ns_capable(ns->user_ns, CAP_IPC_LOCK)) {  in SYSCALL_DEFINE3()
958 		err = shmctl_down(ns, shmid, cmd, buf, version);  in SYSCALL_DEFINE3()
988 	struct ipc_namespace *ns;  in do_shmat()  local
1033 	ns = current->nsproxy->ipc_ns;  in do_shmat()
1034 	shp = shm_lock_check(ns, shmid);  in do_shmat()
1041 	if (ipcperms(ns, &shp->shm_perm, acc_mode))  in do_shmat()
1070 	sfd->ns = get_ipc_ns(ns);  in do_shmat()
1106 	down_write(&shm_ids(ns).rw_mutex);  in do_shmat()
1107 	shp = shm_lock(ns, shmid);  in do_shmat()
1110 	if (shm_may_destroy(ns, shp))  in do_shmat()
1111 		shm_destroy(ns, shp);  in do_shmat()
1114 	up_write(&shm_ids(ns).rw_mutex);  in do_shmat()