[PATCH] posix-timers: Fix clock_nanosleep() doesn't return the remaining time in...

The clock_nanosleep() function does not return the time remaining when the
sleep is interrupted by a signal.

This patch creates a new call out, compat_clock_nanosleep_restart(), which
handles returning the remaining time after a sleep is interrupted.  This
patch revives clock_nanosleep_restart().  It is now accessed via the new
call out.  The compat_clock_nanosleep_restart() is used for compatibility
access.

Since this is implemented in compatibility mode the normal path is
virtually unaffected - no real performance impact.

Signed-off-by: Toyo Abe <toyoa@mvista.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 4fc379d..fca9302 100644 (file)
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -138,6 +138,7 @@ extern long hrtimer_nanosleep(struct timespec *rqtp,
                              struct timespec __user *rmtp,
                              const enum hrtimer_mode mode,
                              const clockid_t clockid);
+extern long hrtimer_nanosleep_restart(struct restart_block *restart_block);
 
 extern void hrtimer_init_sleeper(struct hrtimer_sleeper *sl,
                                 struct task_struct *tsk);

diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 95572c4..a7dd38f 100644 (file)
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -72,6 +72,7 @@ struct k_clock {
        int (*timer_create) (struct k_itimer *timer);
        int (*nsleep) (const clockid_t which_clock, int flags,
                       struct timespec *, struct timespec __user *);
+       long (*nsleep_restart) (struct restart_block *restart_block);
        int (*timer_set) (struct k_itimer * timr, int flags,
                          struct itimerspec * new_setting,
                          struct itimerspec * old_setting);
@@ -97,6 +98,7 @@ int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *ts);
 int posix_cpu_timer_create(struct k_itimer *timer);
 int posix_cpu_nsleep(const clockid_t which_clock, int flags,
                     struct timespec *rqtp, struct timespec __user *rmtp);
+long posix_cpu_nsleep_restart(struct restart_block *restart_block);
 int posix_cpu_timer_set(struct k_itimer *timer, int flags,
                        struct itimerspec *new, struct itimerspec *old);
 int posix_cpu_timer_del(struct k_itimer *timer);
@@ -111,4 +113,6 @@ void posix_cpu_timers_exit_group(struct task_struct *task);
 void set_process_cpu_timer(struct task_struct *task, unsigned int clock_idx,
                           cputime_t *newval, cputime_t *oldval);
 
+long clock_nanosleep_restart(struct restart_block *restart_block);
+
 #endif

diff --git a/kernel/compat.c b/kernel/compat.c
index 126dee9..75573e5 100644 (file)
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -22,6 +22,7 @@
 #include <linux/security.h>
 #include <linux/timex.h>
 #include <linux/migrate.h>
+#include <linux/posix-timers.h>
 
 #include <asm/uaccess.h>
 
@@ -601,6 +602,30 @@ long compat_sys_clock_getres(clockid_t which_clock,
        return err;
 } 
 
+static long compat_clock_nanosleep_restart(struct restart_block *restart)
+{
+       long err;
+       mm_segment_t oldfs;
+       struct timespec tu;
+       struct compat_timespec *rmtp = (struct compat_timespec *)(restart->arg1);
+
+       restart->arg1 = (unsigned long) &tu;
+       oldfs = get_fs();
+       set_fs(KERNEL_DS);
+       err = clock_nanosleep_restart(restart);
+       set_fs(oldfs);
+
+       if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
+           put_compat_timespec(&tu, rmtp))
+               return -EFAULT;
+
+       if (err == -ERESTART_RESTARTBLOCK) {
+               restart->fn = compat_clock_nanosleep_restart;
+               restart->arg1 = (unsigned long) rmtp;
+       }
+       return err;
+}
+
 long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
                            struct compat_timespec __user *rqtp,
                            struct compat_timespec __user *rmtp)
@@ -608,6 +633,7 @@ long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
        long err;
        mm_segment_t oldfs;
        struct timespec in, out; 
+       struct restart_block *restart;
 
        if (get_compat_timespec(&in, rqtp)) 
                return -EFAULT;
@@ -618,9 +644,16 @@ long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
                                  (struct timespec __user *) &in,
                                  (struct timespec __user *) &out);
        set_fs(oldfs);
+
        if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
            put_compat_timespec(&out, rmtp))
                return -EFAULT;
+
+       if (err == -ERESTART_RESTARTBLOCK) {
+               restart = &current_thread_info()->restart_block;
+               restart->fn = compat_clock_nanosleep_restart;
+               restart->arg1 = (unsigned long) rmtp;
+       }
        return err;     
 } 
 

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 21c38a7..d0ba190 100644 (file)
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -693,7 +693,7 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod
        return t->task == NULL;
 }
 
-static long __sched nanosleep_restart(struct restart_block *restart)
+long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
 {
        struct hrtimer_sleeper t;
        struct timespec __user *rmtp;
@@ -702,13 +702,13 @@ static long __sched nanosleep_restart(struct restart_block *restart)
 
        restart->fn = do_no_restart_syscall;
 
-       hrtimer_init(&t.timer, restart->arg3, HRTIMER_ABS);
-       t.timer.expires.tv64 = ((u64)restart->arg1 << 32) | (u64) restart->arg0;
+       hrtimer_init(&t.timer, restart->arg0, HRTIMER_ABS);
+       t.timer.expires.tv64 = ((u64)restart->arg3 << 32) | (u64) restart->arg2;
 
        if (do_nanosleep(&t, HRTIMER_ABS))
                return 0;
 
-       rmtp = (struct timespec __user *) restart->arg2;
+       rmtp = (struct timespec __user *) restart->arg1;
        if (rmtp) {
                time = ktime_sub(t.timer.expires, t.timer.base->get_time());
                if (time.tv64 <= 0)
@@ -718,7 +718,7 @@ static long __sched nanosleep_restart(struct restart_block *restart)
                        return -EFAULT;
        }
 
-       restart->fn = nanosleep_restart;
+       restart->fn = hrtimer_nanosleep_restart;
 
        /* The other values in restart are already filled in */
        return -ERESTART_RESTARTBLOCK;
@@ -751,11 +751,11 @@ long hrtimer_nanosleep(struct timespec *rqtp, struct timespec __user *rmtp,
        }
 
        restart = &current_thread_info()->restart_block;
-       restart->fn = nanosleep_restart;
-       restart->arg0 = t.timer.expires.tv64 & 0xFFFFFFFF;
-       restart->arg1 = t.timer.expires.tv64 >> 32;
-       restart->arg2 = (unsigned long) rmtp;
-       restart->arg3 = (unsigned long) t.timer.base->index;
+       restart->fn = hrtimer_nanosleep_restart;
+       restart->arg0 = (unsigned long) t.timer.base->index;
+       restart->arg1 = (unsigned long) rmtp;
+       restart->arg2 = t.timer.expires.tv64 & 0xFFFFFFFF;
+       restart->arg3 = t.timer.expires.tv64 >> 32;
 
        return -ERESTART_RESTARTBLOCK;
 }

diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index d38d9ec..5667fef 100644 (file)
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -1393,8 +1393,6 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx,
        }
 }
 
-static long posix_cpu_clock_nanosleep_restart(struct restart_block *);
-
 int posix_cpu_nsleep(const clockid_t which_clock, int flags,
                     struct timespec *rqtp, struct timespec __user *rmtp)
 {
@@ -1471,7 +1469,7 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags,
                    copy_to_user(rmtp, &it.it_value, sizeof *rmtp))
                        return -EFAULT;
 
-               restart_block->fn = posix_cpu_clock_nanosleep_restart;
+               restart_block->fn = posix_cpu_nsleep_restart;
                /* Caller already set restart_block->arg1 */
                restart_block->arg0 = which_clock;
                restart_block->arg1 = (unsigned long) rmtp;
@@ -1484,8 +1482,7 @@ int posix_cpu_nsleep(const clockid_t which_clock, int flags,
        return error;
 }
 
-static long
-posix_cpu_clock_nanosleep_restart(struct restart_block *restart_block)
+long posix_cpu_nsleep_restart(struct restart_block *restart_block)
 {
        clockid_t which_clock = restart_block->arg0;
        struct timespec __user *rmtp;
@@ -1524,6 +1521,10 @@ static int process_cpu_nsleep(const clockid_t which_clock, int flags,
 {
        return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp);
 }
+static long process_cpu_nsleep_restart(struct restart_block *restart_block)
+{
+       return -EINVAL;
+}
 static int thread_cpu_clock_getres(const clockid_t which_clock,
                                   struct timespec *tp)
 {
@@ -1544,6 +1545,10 @@ static int thread_cpu_nsleep(const clockid_t which_clock, int flags,
 {
        return -EINVAL;
 }
+static long thread_cpu_nsleep_restart(struct restart_block *restart_block)
+{
+       return -EINVAL;
+}
 
 static __init int init_posix_cpu_timers(void)
 {
@@ -1553,6 +1558,7 @@ static __init int init_posix_cpu_timers(void)
                .clock_set = do_posix_clock_nosettime,
                .timer_create = process_cpu_timer_create,
                .nsleep = process_cpu_nsleep,
+               .nsleep_restart = process_cpu_nsleep_restart,
        };
        struct k_clock thread = {
                .clock_getres = thread_cpu_clock_getres,
@@ -1560,6 +1566,7 @@ static __init int init_posix_cpu_timers(void)
                .clock_set = do_posix_clock_nosettime,
                .timer_create = thread_cpu_timer_create,
                .nsleep = thread_cpu_nsleep,
+               .nsleep_restart = thread_cpu_nsleep_restart,
        };
 
        register_posix_clock(CLOCK_PROCESS_CPUTIME_ID, &process);

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index ac6dc87..e5ebcc1 100644 (file)
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -973,3 +973,24 @@ sys_clock_nanosleep(const clockid_t which_clock, int flags,
        return CLOCK_DISPATCH(which_clock, nsleep,
                              (which_clock, flags, &t, rmtp));
 }
+
+/*
+ * nanosleep_restart for monotonic and realtime clocks
+ */
+static int common_nsleep_restart(struct restart_block *restart_block)
+{
+       return hrtimer_nanosleep_restart(restart_block);
+}
+
+/*
+ * This will restart clock_nanosleep. This is required only by
+ * compat_clock_nanosleep_restart for now.
+ */
+long
+clock_nanosleep_restart(struct restart_block *restart_block)
+{
+       clockid_t which_clock = restart_block->arg0;
+
+       return CLOCK_DISPATCH(which_clock, nsleep_restart,
+                             (restart_block));
+}