Imported Upstream version 0.6.2+git20140204

[mirror_zfs-debian.git] / include / sys / zfs_delay.h

diff --git a/include/sys/zfs_delay.h b/include/sys/zfs_delay.h
new file mode 100644 (file)
index 0000000..b56a7da
--- /dev/null
+++ b/include/sys/zfs_delay.h
@@ -0,0 +1,41 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#ifndef        _SYS_FS_ZFS_DELAY_H
+#define        _SYS_FS_ZFS_DELAY_H
+
+#include <linux/delay_compat.h>
+
+/*
+ * Generic wrapper to sleep until a given time.
+ */
+#define        zfs_sleep_until(wakeup)                                         \
+       do {                                                            \
+               hrtime_t delta = wakeup - gethrtime();                  \
+                                                                       \
+               if (delta > 0) {                                        \
+                       unsigned long delta_us;                         \
+                       delta_us = delta / (NANOSEC / MICROSEC);        \
+                       usleep_range(delta_us, delta_us + 100);         \
+               }                                                       \
+       } while (0)
+
+#endif /* _SYS_FS_ZFS_DELAY_H */