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authorNadia Derbey <Nadia.Derbey@bull.net>2008-04-29 12:00:45 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 19:06:13 +0400
commit6546bc4279241e8fa432de1bb63a4f6f791fd669 (patch)
tree308f5c1621b1019a44800622ffc468a372f09434 /include
parent91cfb2b4b57816de0c96de417b3238249f0b125f (diff)
downloadlinux-6546bc4279241e8fa432de1bb63a4f6f791fd669.tar.xz
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
The enhancement as asked for by Yasunori: if msgmni is set to a negative value, register it back into the ipcns notifier chain. A new interface has been added to the notification mechanism: notifier_chain_cond_register() registers a notifier block only if not already registered. With that new interface we avoid taking care of the states changes in procfs. Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Mingming Cao <cmm@us.ibm.com> Cc: Pierre Peiffer <pierre.peiffer@bull.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ipc_namespace.h1
-rw-r--r--include/linux/notifier.h4
2 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/ipc_namespace.h b/include/linux/ipc_namespace.h
index c3b1da9e5feb..ea6c18a8b0d4 100644
--- a/include/linux/ipc_namespace.h
+++ b/include/linux/ipc_namespace.h
@@ -52,6 +52,7 @@ extern atomic_t nr_ipc_ns;
#define INIT_IPC_NS(ns) .ns = &init_ipc_ns,
extern int register_ipcns_notifier(struct ipc_namespace *);
+extern int cond_register_ipcns_notifier(struct ipc_namespace *);
extern int unregister_ipcns_notifier(struct ipc_namespace *);
extern int ipcns_notify(unsigned long);
diff --git a/include/linux/notifier.h b/include/linux/notifier.h
index 20dfed590183..0ff6224d172a 100644
--- a/include/linux/notifier.h
+++ b/include/linux/notifier.h
@@ -121,6 +121,10 @@ extern int raw_notifier_chain_register(struct raw_notifier_head *nh,
extern int srcu_notifier_chain_register(struct srcu_notifier_head *nh,
struct notifier_block *nb);
+extern int blocking_notifier_chain_cond_register(
+ struct blocking_notifier_head *nh,
+ struct notifier_block *nb);
+
extern int atomic_notifier_chain_unregister(struct atomic_notifier_head *nh,
struct notifier_block *nb);
extern int blocking_notifier_chain_unregister(struct blocking_notifier_head *nh,