From 58cde6ce4143d1852696e96e588079b700b557e0 Mon Sep 17 00:00:00 2001
From: Karel Zak <kzak@redhat.com>
Date: Mon, 19 Oct 2009 15:33:00 +0200
Subject: [PATCH] libblkid: add support for topology ioctls

Signed-off-by: Karel Zak <kzak@redhat.com>
---
 shlibs/blkid/src/topology/Makefile.am |  1 +
 shlibs/blkid/src/topology/ioctl.c     | 70 +++++++++++++++++++++++++++
 shlibs/blkid/src/topology/topology.c  |  1 +
 shlibs/blkid/src/topology/topology.h  |  1 +
 4 files changed, 73 insertions(+)
 create mode 100644 shlibs/blkid/src/topology/ioctl.c

diff --git a/shlibs/blkid/src/topology/Makefile.am b/shlibs/blkid/src/topology/Makefile.am
index 05a8ac9f..c0c3a9f6 100644
--- a/shlibs/blkid/src/topology/Makefile.am
+++ b/shlibs/blkid/src/topology/Makefile.am
@@ -6,6 +6,7 @@ libblkid_topology_la_LIBADD =
 noinst_LTLIBRARIES = libblkid_topology.la
 libblkid_topology_la_SOURCES =	topology.c \
 				topology.h \
+				ioctl.c \
 				sysfs.c \
 				md.c \
 				dm.c \
diff --git a/shlibs/blkid/src/topology/ioctl.c b/shlibs/blkid/src/topology/ioctl.c
new file mode 100644
index 00000000..962b58ac
--- /dev/null
+++ b/shlibs/blkid/src/topology/ioctl.c
@@ -0,0 +1,70 @@
+/*
+ * ioctl based topology -- gathers topology information
+ *
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "blkdev.h"		/* top-level lib/ */
+#include "topology.h"
+
+/*
+ * ioctl topology values
+ */
+static struct topology_val {
+
+	long  ioc;
+
+	/* function to set probing resut */
+	int (*set_result)(blkid_probe, unsigned long);
+
+} topology_vals[] = {
+	{ BLKALIGNOFF, blkid_topology_set_alignment_offset },
+	{ BLKIOMIN, blkid_topology_set_minimum_io_size },
+	{ BLKIOOPT, blkid_topology_set_optimal_io_size },
+};
+
+static int probe_ioctl_tp(blkid_probe pr, const struct blkid_idmag *mag)
+{
+	int i;
+	int count = 0;
+
+	for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {
+		struct topology_val *val = &topology_vals[i];
+		unsigned int data;
+		int rc;
+
+		if (ioctl(pr->fd, val->ioc, &data) == -1)
+			goto nothing;
+		rc = val->set_result(pr, (unsigned long) data);
+		if (rc)
+			goto err;
+		count++;
+	}
+
+	if (count)
+		return 0;
+nothing:
+	return 1;
+err:
+	return -1;
+}
+
+const struct blkid_idinfo ioctl_tp_idinfo =
+{
+	.name		= "ioctl",
+	.probefunc	= probe_ioctl_tp,
+	.magics		= BLKID_NONE_MAGIC
+};
+
diff --git a/shlibs/blkid/src/topology/topology.c b/shlibs/blkid/src/topology/topology.c
index 072261f3..32d800f4 100644
--- a/shlibs/blkid/src/topology/topology.c
+++ b/shlibs/blkid/src/topology/topology.c
@@ -59,6 +59,7 @@ struct blkid_struct_topology {
  */
 static const struct blkid_idinfo *idinfos[] =
 {
+	&ioctl_tp_idinfo,
 	&sysfs_tp_idinfo,
 	&md_tp_idinfo,
 	&dm_tp_idinfo,
diff --git a/shlibs/blkid/src/topology/topology.h b/shlibs/blkid/src/topology/topology.h
index 98321394..fc3fb734 100644
--- a/shlibs/blkid/src/topology/topology.h
+++ b/shlibs/blkid/src/topology/topology.h
@@ -10,6 +10,7 @@ extern int blkid_topology_set_optimal_io_size(blkid_probe pr, unsigned long val)
 /*
  * topology probers
  */
+extern const struct blkid_idinfo ioctl_tp_idinfo;
 extern const struct blkid_idinfo sysfs_tp_idinfo;
 extern const struct blkid_idinfo md_tp_idinfo;
 extern const struct blkid_idinfo dm_tp_idinfo;
-- 
2.39.5