89 #define msg_ids(ns)	((ns)->ids[IPC_MSG_IDS])  argument
91 static inline struct msg_queue *msq_obtain_object(struct ipc_namespace *ns, int id)  in msq_obtain_object()  argument
93 	struct kern_ipc_perm *ipcp = ipc_obtain_object_idr(&msg_ids(ns), id);  in msq_obtain_object()
101 static inline struct msg_queue *msq_obtain_object_check(struct ipc_namespace *ns,  in msq_obtain_object_check()  argument
104 	struct kern_ipc_perm *ipcp = ipc_obtain_object_check(&msg_ids(ns), id);  in msq_obtain_object_check()
112 static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)  in msg_rmid()  argument
114 	ipc_rmid(&msg_ids(ns), &s->q_perm);  in msg_rmid()
133 static int newque(struct ipc_namespace *ns, struct ipc_params *params)  in newque()  argument
157 	msq->q_qbytes = ns->msg_ctlmnb;  in newque()
164 	retval = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);  in newque()
253 static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)  in freeque()  argument
261 	msg_rmid(ns, msq);  in freeque()
267 		atomic_dec(&ns->msg_hdrs);  in freeque()
270 	atomic_sub(msq->q_cbytes, &ns->msg_bytes);  in freeque()
278 	struct ipc_namespace *ns;  in ksys_msgget()  local
285 	ns = current->nsproxy->ipc_ns;  in ksys_msgget()
290 	return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);  in ksys_msgget()
379 static int msgctl_down(struct ipc_namespace *ns, int msqid, int cmd,  in msgctl_down()  argument
386 	down_write(&msg_ids(ns).rwsem);  in msgctl_down()
389 	ipcp = ipcctl_obtain_check(ns, &msg_ids(ns), msqid, cmd,  in msgctl_down()
406 		freeque(ns, ipcp);  in msgctl_down()
412 		if (msqid64->msg_qbytes > ns->msg_ctlmnb &&  in msgctl_down()
451 	up_write(&msg_ids(ns).rwsem);  in msgctl_down()
455 static int msgctl_info(struct ipc_namespace *ns, int msqid,  in msgctl_info()  argument
471 	msginfo->msgmni = ns->msg_ctlmni;  in msgctl_info()
472 	msginfo->msgmax = ns->msg_ctlmax;  in msgctl_info()
473 	msginfo->msgmnb = ns->msg_ctlmnb;  in msgctl_info()
476 	down_read(&msg_ids(ns).rwsem);  in msgctl_info()
478 		msginfo->msgpool = msg_ids(ns).in_use;  in msgctl_info()
479 		msginfo->msgmap = atomic_read(&ns->msg_hdrs);  in msgctl_info()
480 		msginfo->msgtql = atomic_read(&ns->msg_bytes);  in msgctl_info()
486 	max_idx = ipc_get_maxidx(&msg_ids(ns));  in msgctl_info()
487 	up_read(&msg_ids(ns).rwsem);  in msgctl_info()
491 static int msgctl_stat(struct ipc_namespace *ns, int msqid,  in msgctl_stat()  argument
501 		msq = msq_obtain_object(ns, msqid);  in msgctl_stat()
507 		msq = msq_obtain_object_check(ns, msqid);  in msgctl_stat()
519 		if (ipcperms(ns, &msq->q_perm, S_IRUGO))  in msgctl_stat()
572 	struct ipc_namespace *ns;  in ksys_msgctl()  local
579 	ns = current->nsproxy->ipc_ns;  in ksys_msgctl()
585 		err = msgctl_info(ns, msqid, cmd, &msginfo);  in ksys_msgctl()
595 		err = msgctl_stat(ns, msqid, cmd, &msqid64);  in ksys_msgctl()
606 		return msgctl_down(ns, msqid, cmd, &msqid64);  in ksys_msgctl()
706 	struct ipc_namespace *ns;  in compat_ksys_msgctl()  local
710 	ns = current->nsproxy->ipc_ns;  in compat_ksys_msgctl()
719 		err = msgctl_info(ns, msqid, cmd, &msginfo);  in compat_ksys_msgctl()
729 		err = msgctl_stat(ns, msqid, cmd, &msqid64);  in compat_ksys_msgctl()
740 		return msgctl_down(ns, msqid, cmd, &msqid64);  in compat_ksys_msgctl()
822 	struct ipc_namespace *ns;  in do_msgsnd()  local
825 	ns = current->nsproxy->ipc_ns;  in do_msgsnd()
827 	if (msgsz > ns->msg_ctlmax || (long) msgsz < 0 || msqid < 0)  in do_msgsnd()
840 	msq = msq_obtain_object_check(ns, msqid);  in do_msgsnd()
852 		if (ipcperms(ns, &msq->q_perm, S_IWUGO))  in do_msgsnd()
912 		atomic_add(msgsz, &ns->msg_bytes);  in do_msgsnd()
913 		atomic_inc(&ns->msg_hdrs);  in do_msgsnd()
1071 	struct ipc_namespace *ns;  in do_msgrcv()  local
1075 	ns = current->nsproxy->ipc_ns;  in do_msgrcv()
1083 		copy = prepare_copy(buf, min_t(size_t, bufsz, ns->msg_ctlmax));  in do_msgrcv()
1090 	msq = msq_obtain_object_check(ns, msqid);  in do_msgrcv()
1101 		if (ipcperms(ns, &msq->q_perm, S_IRUGO))  in do_msgrcv()
1136 			atomic_sub(msg->m_ts, &ns->msg_bytes);  in do_msgrcv()
1137 			atomic_dec(&ns->msg_hdrs);  in do_msgrcv()
1266 void msg_init_ns(struct ipc_namespace *ns)  in msg_init_ns()  argument
1268 	ns->msg_ctlmax = MSGMAX;  in msg_init_ns()
1269 	ns->msg_ctlmnb = MSGMNB;  in msg_init_ns()
1270 	ns->msg_ctlmni = MSGMNI;  in msg_init_ns()
1272 	atomic_set(&ns->msg_bytes, 0);  in msg_init_ns()
1273 	atomic_set(&ns->msg_hdrs, 0);  in msg_init_ns()
1274 	ipc_init_ids(&ns->ids[IPC_MSG_IDS]);  in msg_init_ns()
1278 void msg_exit_ns(struct ipc_namespace *ns)  in msg_exit_ns()  argument
1280 	free_ipcs(ns, &msg_ids(ns), freeque);  in msg_exit_ns()
1281 	idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);  in msg_exit_ns()
1282 	rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht);  in msg_exit_ns()