1 files changed, 77 insertions, 0 deletions
diff --git a/libblkid/evms.c b/libblkid/evms.c
new file mode 100644
index 000000000..7a4fd554d
--- /dev/null
+++ b/libblkid/evms.c
@@ -0,0 +1,77 @@
+/*
+ * Evms topology
+ * -- this is fallback for old systems where the toplogy information is not
+ *    exported by sysfs
+ *
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "topology.h"
+
+#define EVMS_MAJOR		117
+
+#ifndef _IOT__IOTBASE_u_int32_t
+#define _IOT__IOTBASE_u_int32_t IOT_SIMPLE(uint32_t)
+#endif
+#define _IOT_evms_stripe_info _IOT (_IOTS(uint32_t), 2, 0, 0, 0, 0)
+#define EVMS_GET_STRIPE_INFO	_IOR(EVMS_MAJOR, 0xF0, struct evms_stripe_info)
+
+struct evms_stripe_info {
+	uint32_t	size;		/* stripe unit 512-byte blocks */
+	uint32_t	width;		/* the number of stripe members or RAID data disks */
+} evms_stripe_info;
+
+static int is_evms_device(dev_t devno)
+{
+	if (major(devno) == EVMS_MAJOR)
+		return 1;
+	return blkid_driver_has_major("evms", major(devno));
+}
+
+static int probe_evms_tp(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	struct evms_stripe_info evms;
+	dev_t devno = blkid_probe_get_devno(pr);
+
+	if (!devno)
+		goto nothing;		/* probably not a block device */
+
+	if (!is_evms_device(devno))
+		goto nothing;
+
+	memset(&evms, 0, sizeof(evms));
+
+	if (ioctl(pr->fd, EVMS_GET_STRIPE_INFO, &evms))
+		goto nothing;
+
+	blkid_topology_set_minimum_io_size(pr, evms.size << 9);
+	blkid_topology_set_optimal_io_size(pr, (evms.size * evms.width) << 9);
+
+	return 0;
+
+nothing:
+	return 1;
+}
+
+const struct blkid_idinfo evms_tp_idinfo =
+{
+	.name		= "evms",
+	.probefunc	= probe_evms_tp,
+	.magics		= BLKID_NONE_MAGIC
+};
+