drbd: split polymorph printk to its own file

Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com>
Link: https://lore.kernel.org/r/20221201110349.1282687-3-christoph.boehmwalder@linbit.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/block/drbd/drbd_polymorph_printk.h b/drivers/block/drbd/drbd_polymorph_printk.h
new file mode 100644
index 000000000000..13cc1b311e16
--- /dev/null
+++ b/drivers/block/drbd/drbd_polymorph_printk.h
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef DRBD_POLYMORPH_PRINTK_H
+#define DRBD_POLYMORPH_PRINTK_H
+
+#define __drbd_printk_device(level, device, fmt, args...) \
+	dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args)
+#define __drbd_printk_peer_device(level, peer_device, fmt, args...) \
+	dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args)
+#define __drbd_printk_resource(level, resource, fmt, args...) \
+	printk(level "drbd %s: " fmt, (resource)->name, ## args)
+#define __drbd_printk_connection(level, connection, fmt, args...) \
+	printk(level "drbd %s: " fmt, (connection)->resource->name, ## args)
+
+void drbd_printk_with_wrong_object_type(void);
+
+#define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \
+	(__builtin_types_compatible_p(typeof(obj), type) || \
+	 __builtin_types_compatible_p(typeof(obj), const type)), \
+	func(level, (const type)(obj), fmt, ## args)
+
+#define drbd_printk(level, obj, fmt, args...) \
+	__builtin_choose_expr( \
+	  __drbd_printk_if_same_type(obj, struct drbd_device *, \
+			     __drbd_printk_device, level, fmt, ## args), \
+	  __builtin_choose_expr( \
+	    __drbd_printk_if_same_type(obj, struct drbd_resource *, \
+			       __drbd_printk_resource, level, fmt, ## args), \
+	    __builtin_choose_expr( \
+	      __drbd_printk_if_same_type(obj, struct drbd_connection *, \
+				 __drbd_printk_connection, level, fmt, ## args), \
+	      __builtin_choose_expr( \
+		__drbd_printk_if_same_type(obj, struct drbd_peer_device *, \
+				 __drbd_printk_peer_device, level, fmt, ## args), \
+		drbd_printk_with_wrong_object_type()))))
+
+#define drbd_dbg(obj, fmt, args...) \
+	drbd_printk(KERN_DEBUG, obj, fmt, ## args)
+#define drbd_alert(obj, fmt, args...) \
+	drbd_printk(KERN_ALERT, obj, fmt, ## args)
+#define drbd_err(obj, fmt, args...) \
+	drbd_printk(KERN_ERR, obj, fmt, ## args)
+#define drbd_warn(obj, fmt, args...) \
+	drbd_printk(KERN_WARNING, obj, fmt, ## args)
+#define drbd_info(obj, fmt, args...) \
+	drbd_printk(KERN_INFO, obj, fmt, ## args)
+#define drbd_emerg(obj, fmt, args...) \
+	drbd_printk(KERN_EMERG, obj, fmt, ## args)
+
+#define dynamic_drbd_dbg(device, fmt, args...) \
+	dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args)
+
+#define D_ASSERT(x, exp)							\
+	do {									\
+		if (!(exp))							\
+			drbd_err(x, "ASSERTION %s FAILED in %s\n",		\
+				#exp, __func__);				\
+	} while (0)
+
+/**
+ * expect  -  Make an assertion
+ *
+ * Unlike the assert macro, this macro returns a boolean result.
+ */
+#define expect(exp) ({								\
+		bool _bool = (exp);						\
+		if (!_bool)							\
+			drbd_err(device, "ASSERTION %s FAILED in %s\n",		\
+			        #exp, __func__);				\
+		_bool;								\
+		})
+
+#endif