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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nadia Derbey 2007-10-18 23:40:51 -07:00 • committed by Linus Torvalds
commit 03f02c7657
4 changed files with 46 additions and 18 deletions
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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;