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authorPierre Peiffer <pierre.peiffer@bull.net>2008-02-08 04:18:57 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:26 -0800
commit01b8b07a5d77d22e609267dcae74d15e3e9c5f13 (patch)
treedd53c51f75de9511da7fdf283c73080d6c2552a8 /ipc/namespace.c
parented2ddbf88c0ddeeae4c78bb306a116dfd867c55c (diff)
downloadlinux-01b8b07a5d77d22e609267dcae74d15e3e9c5f13.tar.gz
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>
Diffstat (limited to 'ipc/namespace.c')
-rw-r--r--ipc/namespace.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/ipc/namespace.c b/ipc/namespace.c
index 1fed8922d47..1b967655eb3 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -44,6 +44,36 @@ struct ipc_namespace *copy_ipcs(unsigned long flags, struct ipc_namespace *ns)
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;