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ipc: re-enable msgmni automatic recomputing msgmni if set to negative

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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>
This commit is contained in:
Nadia Derbey
2008-04-29 01:00:45 -07:00
committed by Linus Torvalds
parent 91cfb2b4b5
commit 6546bc4279
5 changed files with 87 additions and 10 deletions
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9
ipc/ipcns_notifier.c
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@ -61,6 +61,15 @@ int register_ipcns_notifier(struct ipc_namespace *ns)
return blocking_notifier_chain_register(&ipcns_chain, &ns->ipcns_nb);
}
int cond_register_ipcns_notifier(struct ipc_namespace *ns)
{
memset(&ns->ipcns_nb, 0, sizeof(ns->ipcns_nb));
ns->ipcns_nb.notifier_call = ipcns_callback;
ns->ipcns_nb.priority = IPCNS_CALLBACK_PRI;
return blocking_notifier_chain_cond_register(&ipcns_chain,
&ns->ipcns_nb);
}
int unregister_ipcns_notifier(struct ipc_namespace *ns)
{
return blocking_notifier_chain_unregister(&ipcns_chain,