IPC: consolidate sem_exit_ns(), msg_exit_ns() and shm_exit_ns()
sem_exit_ns(), msg_exit_ns() and shm_exit_ns() are all called when an
ipc_namespace is released to free all ipcs of each type. But in fact, they
do the same thing: they loop around all ipcs to free them individually by
calling a specific routine.
This patch proposes to consolidate this by introducing a common function,
free_ipcs(), that do the job. The specific routine to call on each
individual ipcs is passed as parameter. For this, these ipc-specific
'free' routines are reworked to take a generic 'struct ipc_perm' as
parameter.
Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/ipc/msg.c b/ipc/msg.c
index ab0c38b..46585a0 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -72,7 +72,7 @@
#define msg_unlock(msq) ipc_unlock(&(msq)->q_perm)
#define msg_buildid(id, seq) ipc_buildid(id, seq)
-static void freeque(struct ipc_namespace *, struct msg_queue *);
+static void freeque(struct ipc_namespace *, struct kern_ipc_perm *);
static int newque(struct ipc_namespace *, struct ipc_params *);
#ifdef CONFIG_PROC_FS
static int sysvipc_msg_proc_show(struct seq_file *s, void *it);
@@ -91,26 +91,7 @@
#ifdef CONFIG_IPC_NS
void msg_exit_ns(struct ipc_namespace *ns)
{
- struct msg_queue *msq;
- struct kern_ipc_perm *perm;
- int next_id;
- int total, in_use;
-
- down_write(&msg_ids(ns).rw_mutex);
-
- in_use = msg_ids(ns).in_use;
-
- for (total = 0, next_id = 0; total < in_use; next_id++) {
- perm = idr_find(&msg_ids(ns).ipcs_idr, next_id);
- if (perm == NULL)
- continue;
- ipc_lock_by_ptr(perm);
- msq = container_of(perm, struct msg_queue, q_perm);
- freeque(ns, msq);
- total++;
- }
-
- up_write(&msg_ids(ns).rw_mutex);
+ free_ipcs(ns, &msg_ids(ns), freeque);
}
#endif
@@ -274,9 +255,10 @@
* msg_ids.rw_mutex (writer) and the spinlock for this message queue are held
* before freeque() is called. msg_ids.rw_mutex remains locked on exit.
*/
-static void freeque(struct ipc_namespace *ns, struct msg_queue *msq)
+static void freeque(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
struct list_head *tmp;
+ struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
expunge_all(msq, -EIDRM);
ss_wakeup(&msq->q_senders, 1);
@@ -582,7 +564,7 @@
break;
}
case IPC_RMID:
- freeque(ns, msq);
+ freeque(ns, &msq->q_perm);
break;
}
err = 0;