From 4b9fcb0ec60584d639ad105c42b75a3447071e47 Mon Sep 17 00:00:00 2001 From: Pierre Peiffer Date: Fri, 8 Feb 2008 04:18:56 -0800 Subject: [PATCH] IPC/semaphores: consolidate SEM_STAT and IPC_STAT commands These commands (SEM_STAT and IPC_STAT) are rather doing the same things (only the meaning of the id given as input and the return value differ). However, for the semaphores, they are handled in two different places (two different functions). This patch consolidates this for clarification by handling these both commands in the same place in semctl_nolock(). It also removes one unused parameter for this function. Signed-off-by: Pierre Peiffer Cc: Nadia Derbey Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/sem.c | 38 ++++++++++++++++---------------------- 1 file changed, 16 insertions(+), 22 deletions(-) diff --git a/ipc/sem.c b/ipc/sem.c index 84c701fe5004..7836edb0cf96 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -617,8 +617,8 @@ static unsigned long copy_semid_to_user(void __user *buf, struct semid64_ds *in, } } -static int semctl_nolock(struct ipc_namespace *ns, int semid, int semnum, - int cmd, int version, union semun arg) +static int semctl_nolock(struct ipc_namespace *ns, int semid, + int cmd, int version, union semun arg) { int err = -EINVAL; struct sem_array *sma; @@ -657,14 +657,23 @@ static int semctl_nolock(struct ipc_namespace *ns, int semid, int semnum, return -EFAULT; return (max_id < 0) ? 0: max_id; } + case IPC_STAT: case SEM_STAT: { struct semid64_ds tbuf; int id; - sma = sem_lock(ns, semid); - if (IS_ERR(sma)) - return PTR_ERR(sma); + if (cmd == SEM_STAT) { + sma = sem_lock(ns, semid); + if (IS_ERR(sma)) + return PTR_ERR(sma); + id = sma->sem_perm.id; + } else { + sma = sem_lock_check(ns, semid); + if (IS_ERR(sma)) + return PTR_ERR(sma); + id = 0; + } err = -EACCES; if (ipcperms (&sma->sem_perm, S_IRUGO)) @@ -674,8 +683,6 @@ static int semctl_nolock(struct ipc_namespace *ns, int semid, int semnum, if (err) goto out_unlock; - id = sma->sem_perm.id; - memset(&tbuf, 0, sizeof(tbuf)); kernel_to_ipc64_perm(&sma->sem_perm, &tbuf.sem_perm); @@ -810,19 +817,6 @@ static int semctl_main(struct ipc_namespace *ns, int semid, int semnum, err = 0; goto out_unlock; } - case IPC_STAT: - { - struct semid64_ds tbuf; - memset(&tbuf,0,sizeof(tbuf)); - kernel_to_ipc64_perm(&sma->sem_perm, &tbuf.sem_perm); - tbuf.sem_otime = sma->sem_otime; - tbuf.sem_ctime = sma->sem_ctime; - tbuf.sem_nsems = sma->sem_nsems; - sem_unlock(sma); - if (copy_semid_to_user (arg.buf, &tbuf, version)) - return -EFAULT; - return 0; - } /* GETVAL, GETPID, GETNCTN, GETZCNT, SETVAL: fall-through */ } err = -EINVAL; @@ -989,15 +983,15 @@ asmlinkage long sys_semctl (int semid, int semnum, int cmd, union semun arg) switch(cmd) { case IPC_INFO: case SEM_INFO: + case IPC_STAT: case SEM_STAT: - err = semctl_nolock(ns,semid,semnum,cmd,version,arg); + err = semctl_nolock(ns, semid, cmd, version, arg); return err; case GETALL: case GETVAL: case GETPID: case GETNCNT: case GETZCNT: - case IPC_STAT: case SETVAL: case SETALL: err = semctl_main(ns,semid,semnum,cmd,version,arg);