libvolume_id: gfs + gfs2 support

Patch from Red Hat.

extras/volume_id/README

@@ -36,6 +36,8 @@ squashfs               *      -      -     -
 minix                  *      -      -     *
 ocfs (1, 2)            *      *      *     *
 vxfs                   *      -      -     *
+nss (netware)          *             *     *
+gfs, gfs2              *      -      -     -
 
 Raid members are detected to prevent the probing for a filesystem
 -----------------------------------------------------------------
@@ -49,7 +51,8 @@ nvidia_raid            *      -      -     -
 promise_raid           *      -      -     -
 silicon_raid           *      -      -     -
 via_raid               *      -      -     -
-
+jmicron                *      -      -     -
+adaptec                *      -      -     -
 
 If no label is found vol_id exits with nonzero and the rule will be
 ignored.

extras/volume_id/lib/Makefile

@@ -13,7 +13,7 @@ INSTALL_DATA  = ${INSTALL} -m 644
 INSTALL_LIB = ${INSTALL} -m 755
 
 SHLIB_CUR = 0
-SHLIB_REV = 65
+SHLIB_REV = 66
 SHLIB_AGE = 0
 SHLIB = libvolume_id.so.$(SHLIB_CUR).$(SHLIB_REV).$(SHLIB_AGE)
 
@@ -45,6 +45,7 @@ OBJS=				\
 	romfs.o			\
 	sysv.o			\
 	minix.o			\
+	gfs.o			\
 	luks.o			\
 	ocfs.o			\
 	vxfs.o			\

extras/volume_id/lib/exported_symbols

@@ -27,6 +27,8 @@
 	volume_id_probe_xfs;
 	volume_id_probe_squashfs;
 	volume_id_probe_netware;
+	volume_id_probe_gfs;
+	volume_id_probe_gfs2;
 
 	volume_id_probe_linux_raid;
 	volume_id_probe_lvm1;

extras/volume_id/lib/gfs.c

@@ -0,0 +1,120 @@
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2006 Red Hat, Inc. <redhat.com>
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation version 2 of the License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+
+#include "libvolume_id.h"
+#include "util.h"
+
+/* Common gfs/gfs2 constants: */
+#define GFS_MAGIC		0x01161970
+#define GFS_DEFAULT_BSIZE	4096
+#define GFS_SUPERBLOCK_OFFSET	(0x10 * GFS_DEFAULT_BSIZE)
+#define GFS_METATYPE_SB		1
+#define GFS_FORMAT_SB		100
+#define GFS_LOCKNAME_LEN	64
+
+/* gfs1 constants: */
+#define GFS_FORMAT_FS		1309
+#define GFS_FORMAT_MULTI	1401
+/* gfs2 constants: */
+#define GFS2_FORMAT_FS		1801
+#define GFS2_FORMAT_MULTI	1900
+
+struct gfs2_meta_header {
+	uint32_t mh_magic;
+	uint32_t mh_type;
+	uint64_t __pad0;          /* Was generation number in gfs1 */
+	uint32_t mh_format;
+	uint32_t __pad1;          /* Was incarnation number in gfs1 */
+};
+
+struct gfs2_inum {
+	uint64_t no_formal_ino;
+	uint64_t no_addr;
+};
+
+struct gfs2_sb {
+	struct gfs2_meta_header sb_header;
+
+	uint32_t sb_fs_format;
+	uint32_t sb_multihost_format;
+	uint32_t  __pad0;  /* Was superblock flags in gfs1 */
+
+	uint32_t sb_bsize;
+	uint32_t sb_bsize_shift;
+	uint32_t __pad1;   /* Was journal segment size in gfs1 */
+
+	struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
+	struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
+	struct gfs2_inum sb_root_dir;
+
+	char sb_lockproto[GFS_LOCKNAME_LEN];
+	char sb_locktable[GFS_LOCKNAME_LEN];
+	/* In gfs1, quota and license dinodes followed */
+} PACKED;
+
+static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int vers)
+{
+	struct gfs2_sb *sbd;
+
+	info("probing at offset 0x%llx", (unsigned long long) off);
+
+	sbd = (struct gfs2_sb *)
+		volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
+	if (sbd == NULL)
+		return -1;
+
+	if (be32_to_cpu(sbd->sb_header.mh_magic) == GFS_MAGIC &&
+		be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_SB &&
+		be32_to_cpu(sbd->sb_header.mh_format) == GFS_FORMAT_SB) {
+		if (vers == 1) {
+			if (be32_to_cpu(sbd->sb_fs_format) != GFS_FORMAT_FS ||
+				be32_to_cpu(sbd->sb_multihost_format) != GFS_FORMAT_MULTI)
+				return -1; /* not gfs1 */
+			id->type = "gfs";
+		}
+		else if (vers == 2) {
+			if (be32_to_cpu(sbd->sb_fs_format) != GFS2_FORMAT_FS ||
+				be32_to_cpu(sbd->sb_multihost_format) != GFS2_FORMAT_MULTI)
+				return -1; /* not gfs2 */
+			id->type = "gfs2";
+		}
+		else
+			return -1;
+		strcpy(id->type_version, "1");
+		volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+		return 0;
+	}
+	return -1;
+}
+
+int volume_id_probe_gfs(struct volume_id *id, uint64_t off)
+{
+	return volume_id_probe_gfs_generic(id, off, 1);
+}
+
+int volume_id_probe_gfs2(struct volume_id *id, uint64_t off)
+{
+	return volume_id_probe_gfs_generic(id, off, 2);
+}

extras/volume_id/lib/libvolume_id.h

@@ -89,6 +89,8 @@ extern int volume_id_probe_vxfs(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_xfs(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_squashfs(struct volume_id *id, uint64_t off);
 extern int volume_id_probe_netware(struct volume_id *id, uint64_t off);
+extern int volume_id_probe_gfs(struct volume_id *id, uint64_t off);
+extern int volume_id_probe_gfs2(struct volume_id *id, uint64_t off);
 
 /* special formats */
 extern int volume_id_probe_linux_swap(struct volume_id *id, uint64_t off);

extras/volume_id/lib/volume_id.c

@@ -171,6 +171,12 @@ int volume_id_probe_filesystem(struct volume_id *id, uint64_t off, uint64_t size
 	if (volume_id_probe_netware(id, off) == 0)
 		goto found;
 
+	if (volume_id_probe_gfs(id, off) == 0)
+		goto found;
+
+	if (volume_id_probe_gfs2(id, off) == 0)
+		goto found;
+
 	return -1;
 
 found: