From b6b337ad1c1d6fe11b09b35d75464b84b3e11f07 Mon Sep 17 00:00:00 2001 From: Nadia Derbey Date: Tue, 29 Apr 2008 01:00:42 -0700 Subject: ipc: recompute msgmni on memory add / remove Introduce the registration of a callback routine that recomputes msg_ctlmni upon memory add / remove. A single notifier block is registered in the hotplug memory chain for all the ipc namespaces. Since the ipc namespaces are not linked together, they have their own notification chain: one notifier_block is defined per ipc namespace. Each time an ipc namespace is created (removed) it registers (unregisters) its notifier block in (from) the ipcns chain. The callback routine registered in the memory chain invokes the ipcns notifier chain with the IPCNS_LOWMEM event. Each callback routine registered in the ipcns namespace, in turn, recomputes msgmni for the owning namespace. Signed-off-by: Nadia Derbey Cc: Yasunori Goto Cc: Matt Helsley Cc: Mingming Cao Cc: Pierre Peiffer Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/util.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'ipc/util.h') diff --git a/ipc/util.h b/ipc/util.h index f37d160c98fe..0e3d79037a2a 100644 --- a/ipc/util.h +++ b/ipc/util.h @@ -124,6 +124,8 @@ extern void free_msg(struct msg_msg *msg); extern struct msg_msg *load_msg(const void __user *src, int len); extern int store_msg(void __user *dest, struct msg_msg *msg, int len); +extern void recompute_msgmni(struct ipc_namespace *); + static inline int ipc_buildid(int id, int seq) { return SEQ_MULTIPLIER * seq + id; -- cgit v1.2.3