diff options
| -rw-r--r-- | include/linux/sem.h | 1 | ||||
| -rw-r--r-- | ipc/sem.c | 37 |
2 files changed, 31 insertions, 7 deletions
diff --git a/include/linux/sem.h b/include/linux/sem.h index 55e17f68d256..976ce3a19f1b 100644 --- a/include/linux/sem.h +++ b/include/linux/sem.h @@ -12,7 +12,6 @@ struct task_struct; struct sem_array { struct kern_ipc_perm ____cacheline_aligned_in_smp sem_perm; /* permissions .. see ipc.h */ - time_t sem_otime; /* last semop time */ time_t sem_ctime; /* last change time */ struct sem *sem_base; /* ptr to first semaphore in array */ struct list_head pending_alter; /* pending operations */ diff --git a/ipc/sem.c b/ipc/sem.c index 6291257ee049..51352e1bfff9 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -99,6 +99,7 @@ struct sem { /* that alter the semaphore */ struct list_head pending_const; /* pending single-sop operations */ /* that do not alter the semaphore*/ + time_t sem_otime; /* candidate for sem_otime */ } ____cacheline_aligned_in_smp; /* One queue for each sleeping process in the system. */ @@ -911,8 +912,14 @@ static void do_smart_update(struct sem_array *sma, struct sembuf *sops, int nsop } } } - if (otime) - sma->sem_otime = get_seconds(); + if (otime) { + if (sops == NULL) { + sma->sem_base[0].sem_otime = get_seconds(); + } else { + sma->sem_base[sops[0].sem_num].sem_otime = + get_seconds(); + } + } } @@ -1058,6 +1065,21 @@ static unsigned long copy_semid_to_user(void __user *buf, struct semid64_ds *in, } } +static time_t get_semotime(struct sem_array *sma) +{ + int i; + time_t res; + + res = sma->sem_base[0].sem_otime; + for (i = 1; i < sma->sem_nsems; i++) { + time_t to = sma->sem_base[i].sem_otime; + + if (to > res) + res = to; + } + return res; +} + static int semctl_nolock(struct ipc_namespace *ns, int semid, int cmd, int version, void __user *p) { @@ -1131,9 +1153,9 @@ static int semctl_nolock(struct ipc_namespace *ns, int semid, goto out_unlock; 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; + tbuf.sem_otime = get_semotime(sma); + tbuf.sem_ctime = sma->sem_ctime; + tbuf.sem_nsems = sma->sem_nsems; rcu_read_unlock(); if (copy_semid_to_user(p, &tbuf, version)) return -EFAULT; @@ -2025,6 +2047,9 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it) { struct user_namespace *user_ns = seq_user_ns(s); struct sem_array *sma = it; + time_t sem_otime; + + sem_otime = get_semotime(sma); return seq_printf(s, "%10d %10d %4o %10u %5u %5u %5u %5u %10lu %10lu\n", @@ -2036,7 +2061,7 @@ static int sysvipc_sem_proc_show(struct seq_file *s, void *it) from_kgid_munged(user_ns, sma->sem_perm.gid), from_kuid_munged(user_ns, sma->sem_perm.cuid), from_kgid_munged(user_ns, sma->sem_perm.cgid), - sma->sem_otime, + sem_otime, sma->sem_ctime); } #endif |