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authorNadia Derbey <Nadia.Derbey@bull.net>2007-10-18 23:40:49 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-19 11:53:44 -0700
commit7748dbfaa010b12d5fb9ddf80199534c565c6bce (patch)
treec6756de4007c29fdcb405d54173a4322d48ff631 /ipc/msg.c
parent7ca7e564e049d8b350ec9d958ff25eaa24226352 (diff)
downloadlinux-7748dbfaa010b12d5fb9ddf80199534c565c6bce.tar.gz
ipc: unify the syscalls code
This patch introduces a change into the sys_msgget(), sys_semget() and sys_shmget() routines: they now share a common code, which is better for maintainability. Signed-off-by: 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/msg.c')
-rw-r--r--ipc/msg.c61
1 files changed, 17 insertions, 44 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index 08591a0278c..c2ee26f0105 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -81,7 +81,7 @@ static struct ipc_ids init_msg_ids;
ipc_buildid(&msg_ids(ns), id, seq)
static void freeque(struct ipc_namespace *, struct msg_queue *);
-static int newque (struct ipc_namespace *ns, key_t key, int msgflg);
+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);
#endif
@@ -144,10 +144,12 @@ static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
ipc_rmid(&msg_ids(ns), &s->q_perm);
}
-static int newque (struct ipc_namespace *ns, key_t key, int msgflg)
+static int newque(struct ipc_namespace *ns, struct ipc_params *params)
{
struct msg_queue *msq;
int id, retval;
+ key_t key = params->key;
+ int msgflg = params->flg;
msq = ipc_rcu_alloc(sizeof(*msq));
if (!msq)
@@ -264,56 +266,27 @@ static void freeque(struct ipc_namespace *ns, struct msg_queue *msq)
ipc_rcu_putref(msq);
}
+static inline int msg_security(void *msq, int msgflg)
+{
+ return security_msg_queue_associate((struct msg_queue *) msq, msgflg);
+}
+
asmlinkage long sys_msgget(key_t key, int msgflg)
{
- struct msg_queue *msq;
- int ret;
struct ipc_namespace *ns;
+ struct ipc_ops msg_ops;
+ struct ipc_params msg_params;
ns = current->nsproxy->ipc_ns;
- ret = idr_pre_get(&msg_ids(ns).ipcs_idr, GFP_KERNEL);
+ msg_ops.getnew = newque;
+ msg_ops.associate = msg_security;
+ msg_ops.more_checks = NULL;
- if (key == IPC_PRIVATE) {
- if (!ret)
- ret = -ENOMEM;
- else {
- mutex_lock(&msg_ids(ns).mutex);
- ret = newque(ns, key, msgflg);
- mutex_unlock(&msg_ids(ns).mutex);
- }
- } else {
- mutex_lock(&msg_ids(ns).mutex);
- msq = (struct msg_queue *) ipc_findkey(&msg_ids(ns), key);
- if (msq == NULL) {
- /* key not used */
- if (!(msgflg & IPC_CREAT))
- ret = -ENOENT;
- else if (!ret)
- ret = -ENOMEM;
- else
- ret = newque(ns, key, msgflg);
- } else {
- /* msq has been locked by ipc_findkey() */
-
- if (msgflg & IPC_CREAT && msgflg & IPC_EXCL)
- ret = -EEXIST;
- else {
- if (ipcperms(&msq->q_perm, msgflg))
- ret = -EACCES;
- else {
- ret = security_msg_queue_associate(
- msq, msgflg);
- if (!ret)
- ret = msq->q_perm.id;
- }
- }
- msg_unlock(msq);
- }
- mutex_unlock(&msg_ids(ns).mutex);
- }
+ msg_params.key = key;
+ msg_params.flg = msgflg;
- return ret;
+ return ipcget(ns, &msg_ids(ns), &msg_ops, &msg_params);
}
static inline unsigned long