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IPC: consolidate sem_exit_ns(), msg_exit_ns() and shm_exit_ns()

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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>
This commit is contained in:
Pierre Peiffer 2008-02-08 04:18:57 -08:00 • committed by Linus Torvalds
parent ed2ddbf88c
commit 01b8b07a5d
5 changed files with 50 additions and 67 deletions
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27
ipc/shm.c
View file

@ -83,8 +83,11 @@ void shm_init_ns(struct ipc_namespace *ns)
* 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 @@ static void do_shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *shp)
#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 @@ asmlinkage long sys_shmctl (int shmid, int cmd, struct shmid_ds __user *buf)
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;
}