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-rw-r--r--libblkid/src/topology/ioctl.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/libblkid/src/topology/ioctl.c b/libblkid/src/topology/ioctl.c
new file mode 100644
index 0000000..3560a2f
--- /dev/null
+++ b/libblkid/src/topology/ioctl.c
@@ -0,0 +1,83 @@
+/*
+ * 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 "topology.h"
+
+/*
+ * ioctl topology values
+ */
+static const struct topology_val {
+
+ long ioc;
+
+ /* functions to set probing result */
+ int (*set_ulong)(blkid_probe, unsigned long);
+ int (*set_int)(blkid_probe, int);
+ int (*set_u64)(blkid_probe, uint64_t);
+
+} topology_vals[] = {
+ { BLKALIGNOFF, NULL, blkid_topology_set_alignment_offset },
+ { BLKIOMIN, blkid_topology_set_minimum_io_size },
+ { BLKIOOPT, blkid_topology_set_optimal_io_size },
+ { BLKPBSZGET, blkid_topology_set_physical_sector_size },
+ { BLKGETDISKSEQ, .set_u64 = blkid_topology_set_diskseq },
+ /* we read BLKSSZGET in topology.c */
+};
+
+static int probe_ioctl_tp(blkid_probe pr,
+ const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+ size_t i;
+
+ for (i = 0; i < ARRAY_SIZE(topology_vals); i++) {
+ const struct topology_val *val = &topology_vals[i];
+ int rc = 1;
+ union {
+ unsigned long ul;
+ int i;
+ uint64_t u64;
+ } data;
+
+ if (ioctl(pr->fd, val->ioc, &data) == -1)
+ goto nothing;
+
+ if (val->set_int)
+ rc = val->set_int(pr, data.i);
+ else if (val->set_ulong)
+ rc = val->set_ulong(pr, data.ul);
+ else
+ rc = val->set_u64(pr, data.u64);
+
+ if (rc)
+ goto err;
+ }
+
+ 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
+};
+