Commit 1ca7003a authored by Davidlohr Bueso's avatar Davidlohr Bueso Committed by Linus Torvalds

ipc: introduce ipc object locking helpers

Simple helpers around the (kern_ipc_perm *)->lock spinlock.
Signed-off-by: 's avatarDavidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dbfcd91f
......@@ -159,23 +159,33 @@ static inline int ipc_checkid(struct kern_ipc_perm *ipcp, int uid)
return uid / SEQ_MULTIPLIER != ipcp->seq;
}
static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
static inline void ipc_lock_object(struct kern_ipc_perm *perm)
{
rcu_read_lock();
spin_lock(&perm->lock);
}
static inline void ipc_unlock(struct kern_ipc_perm *perm)
static inline void ipc_unlock_object(struct kern_ipc_perm *perm)
{
spin_unlock(&perm->lock);
rcu_read_unlock();
}
static inline void ipc_lock_object(struct kern_ipc_perm *perm)
static inline void ipc_assert_locked_object(struct kern_ipc_perm *perm)
{
assert_spin_locked(&perm->lock);
}
static inline void ipc_lock_by_ptr(struct kern_ipc_perm *perm)
{
rcu_read_lock();
spin_lock(&perm->lock);
}
static inline void ipc_unlock(struct kern_ipc_perm *perm)
{
spin_unlock(&perm->lock);
rcu_read_unlock();
}
struct kern_ipc_perm *ipc_lock_check(struct ipc_ids *ids, int id);
struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id);
int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
......
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