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Message-Id: <200608092309.k79N90WG028311@dhcp119.mvista.com>
Date: Wed, 9 Aug 2006 16:09:00 -0700
From: toyoa@...sta.com
To: george@...dturkeyranch.net
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] posix-timers: Fix clock_nanosleep() doesn't return the remaining time in compatibility mode.
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@...sta.com>
---
--- linux-2.6.18-rc4.org/include/linux/hrtimer.h 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/include/linux/hrtimer.h 2006-08-08 12:07:18.000000000 -0700
@@ -137,6 +137,7 @@ extern long hrtimer_nanosleep(struct tim
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);
--- linux-2.6.18-rc4.org/include/linux/posix-timers.h 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/include/linux/posix-timers.h 2006-08-08 12:07:18.000000000 -0700
@@ -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
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
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
--- linux-2.6.18-rc4.org/kernel/compat.c 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/kernel/compat.c 2006-08-08 12:07:18.000000000 -0700
@@ -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 w
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_
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_
(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 = ¤t_thread_info()->restart_block;
+ restart->fn = compat_clock_nanosleep_restart;
+ restart->arg1 = (unsigned long) rmtp;
+ }
return err;
}
--- linux-2.6.18-rc4.org/kernel/hrtimer.c 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/kernel/hrtimer.c 2006-08-08 12:07:18.000000000 -0700
@@ -693,7 +693,7 @@ static int __sched do_nanosleep(struct h
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(st
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(st
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 *
}
restart = ¤t_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;
}
--- linux-2.6.18-rc4.org/kernel/posix-cpu-timers.c 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/kernel/posix-cpu-timers.c 2006-08-08 13:54:32.000000000 -0700
@@ -1393,8 +1393,6 @@ void set_process_cpu_timer(struct task_s
}
}
-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 whi
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 whi
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 cloc
{
return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp);
}
+static int 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 clock
{
return -EINVAL;
}
+static int 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(
.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(
.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);
--- linux-2.6.18-rc4.org/kernel/posix-timers.c 2006-08-08 12:10:02.000000000 -0700
+++ linux-2.6.18-rc4/kernel/posix-timers.c 2006-08-08 13:54:13.000000000 -0700
@@ -973,3 +973,24 @@ sys_clock_nanosleep(const clockid_t whic
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));
+}
-
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