linux-kernel - [PATCH] virtualization of sysv msg queues is incomplete

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Message-ID: <470A0EF5.7030303@openvz.org>
Date:	Mon, 08 Oct 2007 15:05:25 +0400
From:	Kirill Korotaev <dev@...nvz.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] virtualization of sysv msg queues is incomplete

Virtualization of sysv msg queues is incomplete:
msg_hdrs and msg_bytes variables visible from userspace are global.
Let's make them per-namespace.

Signed-Off-By: Alexey Kuznetsov <alexey@...nvz.org>
Signed-Off-By: Kirill Korotaev <dev@...nvz.org>

---
 include/linux/ipc.h |    2 ++
 ipc/msg.c           |   21 ++++++++++-----------
 2 files changed, 12 insertions(+), 11 deletions(-)

--- ./include/linux/ipc.h.ve1012	2007-10-08 14:35:40.000000000 +0400
+++ ./include/linux/ipc.h	2007-10-08 14:40:31.000000000 +0400
@@ -111,6 +111,8 @@ struct ipc_namespace {
 	int		msg_ctlmax;
 	int		msg_ctlmnb;
 	int		msg_ctlmni;
+	atomic_t	msg_bytes;
+	atomic_t	msg_hdrs;
 
 	size_t		shm_ctlmax;
 	size_t		shm_ctlall;
--- ./ipc/msg.c.ve1012	2007-10-08 14:35:40.000000000 +0400
+++ ./ipc/msg.c	2007-10-08 14:41:41.000000000 +0400
@@ -66,9 +66,6 @@ struct msg_sender {
 #define SEARCH_NOTEQUAL		3
 #define SEARCH_LESSEQUAL	4
 
-static atomic_t msg_bytes =	ATOMIC_INIT(0);
-static atomic_t msg_hdrs =	ATOMIC_INIT(0);
-
 static struct ipc_ids init_msg_ids;
 
 #define msg_ids(ns)	(*((ns)->ids[IPC_MSG_IDS]))
@@ -89,6 +86,8 @@ static void __msg_init_ns(struct ipc_nam
 	ns->msg_ctlmax = MSGMAX;
 	ns->msg_ctlmnb = MSGMNB;
 	ns->msg_ctlmni = MSGMNI;
+	atomic_set(&ns->msg_bytes, 0);
+	atomic_set(&ns->msg_hdrs, 0);
 	ipc_init_ids(ids);
 }
 
@@ -277,10 +276,10 @@ static void freeque(struct ipc_namespace
 		struct msg_msg *msg = list_entry(tmp, struct msg_msg, m_list);
 
 		tmp = tmp->next;
-		atomic_dec(&msg_hdrs);
+		atomic_dec(&ns->msg_hdrs);
 		free_msg(msg);
 	}
-	atomic_sub(msq->q_cbytes, &msg_bytes);
+	atomic_sub(msq->q_cbytes, &ns->msg_bytes);
 	security_msg_queue_free(msq);
 	ipc_rcu_putref(msq);
 }
@@ -447,8 +446,8 @@ asmlinkage long sys_msgctl(int msqid, in
 		mutex_lock(&msg_ids(ns).mutex);
 		if (cmd == MSG_INFO) {
 			msginfo.msgpool = msg_ids(ns).in_use;
-			msginfo.msgmap = atomic_read(&msg_hdrs);
-			msginfo.msgtql = atomic_read(&msg_bytes);
+			msginfo.msgmap = atomic_read(&ns->msg_hdrs);
+			msginfo.msgtql = atomic_read(&ns->msg_bytes);
 		} else {
 			msginfo.msgmap = MSGMAP;
 			msginfo.msgpool = MSGPOOL;
@@ -719,8 +718,8 @@ long do_msgsnd(int msqid, long mtype, vo
 		list_add_tail(&msg->m_list, &msq->q_messages);
 		msq->q_cbytes += msgsz;
 		msq->q_qnum++;
-		atomic_add(msgsz, &msg_bytes);
-		atomic_inc(&msg_hdrs);
+		atomic_add(msgsz, &ns->msg_bytes);
+		atomic_inc(&ns->msg_hdrs);
 	}
 
 	err = 0;
@@ -824,8 +823,8 @@ long do_msgrcv(int msqid, long *pmtype, 
 			msq->q_rtime = get_seconds();
 			msq->q_lrpid = task_tgid_vnr(current);
 			msq->q_cbytes -= msg->m_ts;
-			atomic_sub(msg->m_ts, &msg_bytes);
-			atomic_dec(&msg_hdrs);
+			atomic_sub(msg->m_ts, &ns->msg_bytes);
+			atomic_dec(&ns->msg_hdrs);
 			ss_wakeup(&msq->q_senders, 0);
 			msg_unlock(msq);
 			break;

-
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