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Storing ipcs into IDRs

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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 <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:
Nadia Derbey 2007-10-18 23:40:51 -07:00 committed by Linus Torvalds
parent 023a53557e
commit 03f02c7657
4 changed files with 46 additions and 18 deletions
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14
ipc/msg.c
View File

@ -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 *ns, struct msg_queue *msq)
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)

23
ipc/sem.c
View File

@ -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 *ns, struct ipc_params *params)
}
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;

23
ipc/shm.c
View File

@ -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;

4
ipc/util.h
View File

@ -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;