This patch converts casts of struct kern_ipc_perm to
. struct msg_queue
. struct sem_array
. struct shmid_kernel
into the equivalent container_of() macro. It improves code maintenance
because the code need not change if kern_ipc_perm is no longer at the
beginning of the containing struct.
Signed-off-by: Nadia Derbey <[email protected]>
---
This patch applies on top of 2.6.23-rc4-mm1 + the previous IPC patches.
Hopefully this will make review and application easier for anyone already
familiar with this series.
ipc/msg.c | 14 ++++++++++----
ipc/sem.c | 23 +++++++++++++++++------
ipc/shm.c | 23 +++++++++++++++++------
ipc/util.h | 4 ++--
4 files changed, 46 insertions(+), 18 deletions(-)
Index: linux-2.6.23-rc4-mm1/ipc/msg.c
===================================================================
--- linux-2.6.23-rc4-mm1.orig/ipc/msg.c 2007-09-13 14:04:28.000000000 +0200
+++ linux-2.6.23-rc4-mm1/ipc/msg.c 2007-09-13 14:11:43.000000000 +0200
@@ -138,13 +138,17 @@ void __init msg_init(void)
static inline struct msg_queue *msg_lock(struct ipc_namespace *ns, int id)
{
- return (struct msg_queue *) ipc_lock(&msg_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock(&msg_ids(ns), id);
+
+ return container_of(ipcp, struct msg_queue, q_perm);
}
static inline struct msg_queue *msg_lock_check(struct ipc_namespace *ns,
int id)
{
- return (struct msg_queue *) ipc_lock_check(&msg_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock_check(&msg_ids(ns), id);
+
+ return container_of(ipcp, struct msg_queue, q_perm);
}
static inline void msg_rmid(struct ipc_namespace *ns, struct msg_queue *s)
@@ -274,9 +278,11 @@ static void freeque(struct ipc_namespace
ipc_rcu_putref(msq);
}
-static inline int msg_security(void *msq, int msgflg)
+static inline int msg_security(struct kern_ipc_perm *ipcp, int msgflg)
{
- return security_msg_queue_associate((struct msg_queue *) msq, msgflg);
+ struct msg_queue *msq = container_of(ipcp, struct msg_queue, q_perm);
+
+ return security_msg_queue_associate(msq, msgflg);
}
asmlinkage long sys_msgget(key_t key, int msgflg)
Index: linux-2.6.23-rc4-mm1/ipc/sem.c
===================================================================
--- linux-2.6.23-rc4-mm1.orig/ipc/sem.c 2007-09-13 14:04:28.000000000 +0200
+++ linux-2.6.23-rc4-mm1/ipc/sem.c 2007-09-13 14:16:30.000000000 +0200
@@ -176,13 +176,17 @@ void __init sem_init (void)
static inline struct sem_array *sem_lock(struct ipc_namespace *ns, int id)
{
- return (struct sem_array *) ipc_lock(&sem_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock(&sem_ids(ns), id);
+
+ return container_of(ipcp, struct sem_array, sem_perm);
}
static inline struct sem_array *sem_lock_check(struct ipc_namespace *ns,
int id)
{
- return (struct sem_array *) ipc_lock_check(&sem_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock_check(&sem_ids(ns), id);
+
+ return container_of(ipcp, struct sem_array, sem_perm);
}
static inline void sem_rmid(struct ipc_namespace *ns, struct sem_array *s)
@@ -277,14 +281,21 @@ static int newary(struct ipc_namespace *
}
-static inline int sem_security(void *sma, int semflg)
+static inline int sem_security(struct kern_ipc_perm *ipcp, int semflg)
{
- return security_sem_associate((struct sem_array *) sma, semflg);
+ struct sem_array *sma;
+
+ sma = container_of(ipcp, struct sem_array, sem_perm);
+ return security_sem_associate(sma, semflg);
}
-static inline int sem_more_checks(void *sma, struct ipc_params *params)
+static inline int sem_more_checks(struct kern_ipc_perm *ipcp,
+ struct ipc_params *params)
{
- if (params->u.nsems > ((struct sem_array *)sma)->sem_nsems)
+ struct sem_array *sma;
+
+ sma = container_of(ipcp, struct sem_array, sem_perm);
+ if (params->u.nsems > sma->sem_nsems)
return -EINVAL;
return 0;
Index: linux-2.6.23-rc4-mm1/ipc/shm.c
===================================================================
--- linux-2.6.23-rc4-mm1.orig/ipc/shm.c 2007-09-13 14:04:28.000000000 +0200
+++ linux-2.6.23-rc4-mm1/ipc/shm.c 2007-09-13 14:19:51.000000000 +0200
@@ -139,13 +139,17 @@ void __init shm_init (void)
static inline struct shmid_kernel *shm_lock(struct ipc_namespace *ns, int id)
{
- return (struct shmid_kernel *) ipc_lock(&shm_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock(&shm_ids(ns), id);
+
+ return container_of(ipcp, struct shmid_kernel, shm_perm);
}
static inline struct shmid_kernel *shm_lock_check(struct ipc_namespace *ns,
int id)
{
- return (struct shmid_kernel *) ipc_lock_check(&shm_ids(ns), id);
+ struct kern_ipc_perm *ipcp = ipc_lock_check(&shm_ids(ns), id);
+
+ return container_of(ipcp, struct shmid_kernel, shm_perm);
}
static inline void shm_rmid(struct ipc_namespace *ns, struct shmid_kernel *s)
@@ -424,14 +428,21 @@ no_file:
return error;
}
-static inline int shm_security(void *shp, int shmflg)
+static inline int shm_security(struct kern_ipc_perm *ipcp, int shmflg)
{
- return security_shm_associate((struct shmid_kernel *) shp, shmflg);
+ struct shmid_kernel *shp;
+
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+ return security_shm_associate(shp, shmflg);
}
-static inline int shm_more_checks(void *shp, struct ipc_params *params)
+static inline int shm_more_checks(struct kern_ipc_perm *ipcp,
+ struct ipc_params *params)
{
- if (((struct shmid_kernel *)shp)->shm_segsz < params->u.size)
+ struct shmid_kernel *shp;
+
+ shp = container_of(ipcp, struct shmid_kernel, shm_perm);
+ if (shp->shm_segsz < params->u.size)
return -EINVAL;
return 0;
Index: linux-2.6.23-rc4-mm1/ipc/util.h
===================================================================
--- linux-2.6.23-rc4-mm1.orig/ipc/util.h 2007-09-13 14:04:28.000000000 +0200
+++ linux-2.6.23-rc4-mm1/ipc/util.h 2007-09-13 14:20:44.000000000 +0200
@@ -61,8 +61,8 @@ struct ipc_params {
*/
struct ipc_ops {
int (*getnew) (struct ipc_namespace *, struct ipc_params *);
- int (*associate) (void *, int);
- int (*more_checks) (void *, struct ipc_params *);
+ int (*associate) (struct kern_ipc_perm *, int);
+ int (*more_checks) (struct kern_ipc_perm *, struct ipc_params *);
};
struct seq_file;
--
-
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