select: add poll_select_set_timeout() and poll_select_copy_remaining() helpers

This patch adds 2 helpers that will be used for the hrtimer based select/poll:

poll_select_set_timeout() is a helper that takes a timeout (as a second, nanosecond
pair) and turns that into a "struct timespec" that represents the absolute end time.
This is a common operation in the many select() and poll() variants and needs various,
common, sanity checks.

poll_select_copy_remaining() is a helper that takes care of copying the remaining
time to userspace, as select(), pselect() and ppoll() do. This function comes in
both a natural and a compat implementation (due to datastructure differences).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

1 files changed, 51 insertions, 0 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 075d0509970d..424767c954a0 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1436,6 +1436,57 @@ out_ret:
 
 #define __COMPAT_NFDBITS       (8 * sizeof(compat_ulong_t))
 
+static int poll_select_copy_remaining(struct timespec *end_time, void __user *p,
+                                      int timeval, int ret)
+{
+        struct timespec ts;
+
+        if (!p)
+                return ret;
+
+        if (current->personality & STICKY_TIMEOUTS)
+                goto sticky;
+
+        /* No update for zero timeout */
+        if (!end_time->tv_sec && !end_time->tv_nsec)
+                return ret;
+
+        ktime_get_ts(&ts);
+        ts = timespec_sub(*end_time, ts);
+        if (ts.tv_sec < 0)
+                ts.tv_sec = ts.tv_nsec = 0;
+
+        if (timeval) {
+                struct compat_timeval rtv;
+
+                rtv.tv_sec = ts.tv_sec;
+                rtv.tv_usec = ts.tv_nsec / NSEC_PER_USEC;
+
+                if (!copy_to_user(p, &rtv, sizeof(rtv)))
+                        return ret;
+        } else {
+                struct compat_timespec rts;
+
+                rts.tv_sec = ts.tv_sec;
+                rts.tv_nsec = ts.tv_nsec;
+
+                if (!copy_to_user(p, &rts, sizeof(rts)))
+                        return ret;
+        }
+        /*
+         * If an application puts its timeval in read-only memory, we
+         * don't want the Linux-specific update to the timeval to
+         * cause a fault after the select has completed
+         * successfully. However, because we're not updating the
+         * timeval, we can't restart the system call.
+         */
+
+sticky:
+        if (ret == -ERESTARTNOHAND)
+                ret = -EINTR;
+        return ret;
+}
+
 /*
  * Ooo, nasty.  We need here to frob 32-bit unsigned longs to
  * 64-bit unsigned longs.