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;
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 1fed892..1b96765 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -44,6 +44,36 @@
return new_ns;
}
+/*
+ * free_ipcs - free all ipcs of one type
+ * @ns: the namespace to remove the ipcs from
+ * @ids: the table of ipcs to free
+ * @free: the function called to free each individual ipc
+ *
+ * Called for each kind of ipc when an ipc_namespace exits.
+ */
+void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
+ void (*free)(struct ipc_namespace *, struct kern_ipc_perm *))
+{
+ struct kern_ipc_perm *perm;
+ int next_id;
+ int total, in_use;
+
+ down_write(&ids->rw_mutex);
+
+ in_use = ids->in_use;
+
+ for (total = 0, next_id = 0; total < in_use; next_id++) {
+ perm = idr_find(&ids->ipcs_idr, next_id);
+ if (perm == NULL)
+ continue;
+ ipc_lock_by_ptr(perm);
+ free(ns, perm);
+ total++;
+ }
+ up_write(&ids->rw_mutex);
+}
+
void free_ipc_ns(struct kref *kref)
{
struct ipc_namespace *ns;
diff --git a/ipc/sem.c b/ipc/sem.c
index 1f7e28d..0b45a4d 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -94,7 +94,7 @@
#define sem_buildid(id, seq) ipc_buildid(id, seq)
static int newary(struct ipc_namespace *, struct ipc_params *);
-static void freeary(struct ipc_namespace *, struct sem_array *);
+static void freeary(struct ipc_namespace *, struct kern_ipc_perm *);
#ifdef CONFIG_PROC_FS
static int sysvipc_sem_proc_show(struct seq_file *s, void *it);
#endif
@@ -129,25 +129,7 @@
#ifdef CONFIG_IPC_NS
void sem_exit_ns(struct ipc_namespace *ns)
{
- struct sem_array *sma;
- struct kern_ipc_perm *perm;
- int next_id;
- int total, in_use;
-
- down_write(&sem_ids(ns).rw_mutex);
-
- in_use = sem_ids(ns).in_use;
-
- for (total = 0, next_id = 0; total < in_use; next_id++) {
- perm = idr_find(&sem_ids(ns).ipcs_idr, next_id);
- if (perm == NULL)
- continue;
- ipc_lock_by_ptr(perm);
- sma = container_of(perm, struct sem_array, sem_perm);
- freeary(ns, sma);
- total++;
- }
- up_write(&sem_ids(ns).rw_mutex);
+ free_ipcs(ns, &sem_ids(ns), freeary);
}
#endif
@@ -542,10 +524,11 @@
* as a writer and the spinlock for this semaphore set hold. sem_ids.rw_mutex
* remains locked on exit.
*/
-static void freeary(struct ipc_namespace *ns, struct sem_array *sma)
+static void freeary(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
struct sem_undo *un;
struct sem_queue *q;
+ struct sem_array *sma = container_of(ipcp, struct sem_array, sem_perm);
/* Invalidate the existing undo structures for this semaphore set.
* (They will be freed without any further action in exit_sem()
@@ -926,7 +909,7 @@
switch(cmd){
case IPC_RMID:
- freeary(ns, sma);
+ freeary(ns, ipcp);
err = 0;
break;
case IPC_SET:
diff --git a/ipc/shm.c b/ipc/shm.c
index fe92471..c47e872 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -83,8 +83,11 @@
* Called with shm_ids.rw_mutex (writer) and the shp structure locked.
* Only shm_ids.rw_mutex remains locked on exit.
*/
-static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
+static void do_shm_rmid(struct ipc_namespace *ns, struct kern_ipc_perm *ipcp)
{
+ struct shmid_kernel *shp;
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+
if (shp->shm_nattch){
shp->shm_perm.mode |= SHM_DEST;
/* Do not find it any more */
@@ -97,25 +100,7 @@
#ifdef CONFIG_IPC_NS
void shm_exit_ns(struct ipc_namespace *ns)
{
- struct shmid_kernel *shp;
- struct kern_ipc_perm *perm;
- int next_id;
- int total, in_use;
-
- down_write(&shm_ids(ns).rw_mutex);
-
- in_use = shm_ids(ns).in_use;
-
- for (total = 0, next_id = 0; total < in_use; next_id++) {
- perm = idr_find(&shm_ids(ns).ipcs_idr, next_id);
- if (perm == NULL)
- continue;
- ipc_lock_by_ptr(perm);
- shp = container_of(perm, struct shmid_kernel, shm_perm);
- do_shm_rmid(ns, shp);
- total++;
- }
- up_write(&shm_ids(ns).rw_mutex);
+ free_ipcs(ns, &shm_ids(ns), do_shm_rmid);
}
#endif
@@ -832,7 +817,7 @@
if (err)
goto out_unlock_up;
- do_shm_rmid(ns, shp);
+ do_shm_rmid(ns, &shp->shm_perm);
up_write(&shm_ids(ns).rw_mutex);
goto out;
}