From f1568304e07a890c77337553fcfae7c51cba6990 Mon Sep 17 00:00:00 2001
From: Alasdair Kergon <agk@redhat.com>
Date: Wed, 2 Jan 2002 19:01:09 +0000
Subject: [PATCH] o Allow the definition of read-only devices (ioctl interface
 only)  (Joe) o Add version number to ioctl structure with error on
 kernel/library mismatch

---
 libdm/Makefile.in          | 16 ++++++++++++++++
 libdm/ioctl/libdevmapper.c |  1 +
 2 files changed, 17 insertions(+)

diff --git a/libdm/Makefile.in b/libdm/Makefile.in
index 2531e2347..d538baf20 100644
--- a/libdm/Makefile.in
+++ b/libdm/Makefile.in
@@ -17,6 +17,7 @@ TARGETS=$(interface)/libdevmapper.so
 
 include ../make.tmpl
 
+
 install: @interface@/libdevmapper.so
 	$(INSTALL) -D -o $(OWNER) -g $(GROUP) -m 555 $(STRIP) $< \
 		$(libdir)/libdevmapper.so.$(VERSION)
@@ -26,3 +27,18 @@ install: @interface@/libdevmapper.so
 
 .PHONY: install 
 
+
+ifeq ($(interface),ioctl)
+
+ioctl/libdevmapper.o: ioctl_version
+
+ioctl_version: ioctl/libdevmapper.c
+	@echo Checking library version compatible with kernel version in dm-ioctl.h
+	test "$(VERSION)" = \
+	     "$(shell $(CC) -E -dM $(INCLUDES) $(CFLAGS) \
+	      ioctl/libdevmapper.c | \
+	      awk -F '[ \t\"]+' '/DM_IOCTL_VERSION/ {print $$3}' )"
+
+.PHONY: ioctl_version
+
+endif
diff --git a/libdm/ioctl/libdevmapper.c b/libdm/ioctl/libdevmapper.c
index 059adf44a..4f11ad13c 100644
--- a/libdm/ioctl/libdevmapper.c
+++ b/libdm/ioctl/libdevmapper.c
@@ -150,6 +150,7 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
 	if (!(dmi = malloc(len)))
 		return NULL;
 
+	strncpy(dmi->version, DM_IOCTL_VERSION, sizeof(dmi->version));
 	dmi->data_size = len;
 	strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
 	dmi->suspend = (dmt->type == DM_DEVICE_SUSPEND) ? 1 : 0;
-- 
2.43.5