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net: Allow pernet_operations to be executed in parallel

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This adds new pernet_operations::async flag to indicate operations,
which ->init(), ->exit() and ->exit_batch() methods are allowed
to be executed in parallel with the methods of any other pernet_operations.

When there are only asynchronous pernet_operations in the system,
net_mutex won't be taken for a net construction and destruction.

Also, remove BUG_ON(mutex_is_locked()) from net_assign_generic()
without replacing with the equivalent net_sem check, as there is
one more lockdep assert below.

v3: Add comment near net_mutex.

Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Acked-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kirill Tkhai
2018-02-13 12:26:44 +03:00
committed by David S. Miller
parent bcab1ddd9b
commit 447cd7a0d7
2 changed files with 26 additions and 10 deletions
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6
include/net/net_namespace.h
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@@ -313,6 +313,12 @@ struct pernet_operations {
void (*exit_batch)(struct list_head *net_exit_list);
unsigned int *id;
size_t size;
/*
* Indicates above methods are allowed to be executed in parallel
* with methods of any other pernet_operations, i.e. they are not
* need synchronization via net_mutex.
*/
bool async;
};
/*