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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 <[email protected]>
Cc: Cedric Le Goater <[email protected]>
Cc: Pavel Emelyanov <[email protected]>
Cc: Nadia Derbey <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pierre Peiffer 2008-02-08 04:18:57 -08:00 • committed by Linus Torvalds
commit 01b8b07a5d
5 changed files with 50 additions and 67 deletions
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27
ipc/sem.c
View file

@ -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 @@ void sem_init_ns(struct ipc_namespace *ns)
#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 @@ static int count_semzcnt (struct sem_array * sma, ushort semnum)
* 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 @@ static int semctl_down(struct ipc_namespace *ns, int semid, int semnum,
switch(cmd){
case IPC_RMID:
freeary(ns, sma);
freeary(ns, ipcp);
err = 0;
break;
case IPC_SET: