volume_id: support for GFS2 UUIDs

[elogind.git] / extras / volume_id / lib / gfs.c

diff --git a/extras/volume_id/lib/gfs.c b/extras/volume_id/lib/gfs.c
index 40a4493b32710bd6fb55c6ff1ea57966d18fcccb..d97730c7a4d9b8a5aaff11b4e3b2ef89aa5e2266 100644 (file)
--- a/extras/volume_id/lib/gfs.c
+++ b/extras/volume_id/lib/gfs.c
@@ -3,19 +3,24 @@
  *
  * 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.
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 #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>
@@ -24,7 +29,7 @@
 #include <ctype.h>
 
 #include "libvolume_id.h"
-#include "util.h"
+#include "libvolume_id-private.h"
 
 /* Common gfs/gfs2 constants: */
 #define GFS_MAGIC              0x01161970
@@ -71,14 +76,27 @@ struct gfs2_sb {
 
        char sb_lockproto[GFS_LOCKNAME_LEN];
        char sb_locktable[GFS_LOCKNAME_LEN];
-       /* In gfs1, quota and license dinodes followed */
+
+       struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
+       struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
+       uint8_t sb_uuid[16]; /* The UUID maybe 0 for backwards compat */
 } PACKED;
 
+static int uuid_non_zero(const uint8_t *p)
+{
+       int i;
+       for (i = 0; i < 16; i++) {
+               if (p[i] != 0)
+                       return 1;
+       }
+       return 0;
+}
+
 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);
+       info("probing at offset 0x%" PRIx64 "\n", off);
 
        sbd = (struct gfs2_sb *)
                volume_id_get_buffer(id, off + GFS_SUPERBLOCK_OFFSET, sizeof(struct gfs2_sb));
@@ -86,8 +104,7 @@ static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int v
                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) {
+               be32_to_cpu(sbd->sb_header.mh_type) == GFS_METATYPE_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)
@@ -102,6 +119,15 @@ static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int v
                }
                else
                        return -1;
+
+               if (strlen(sbd->sb_locktable)) {
+                       uint8_t *label = (uint8_t *) sbd->sb_locktable;
+
+                       volume_id_set_label_raw(id, label, GFS_LOCKNAME_LEN);
+                       volume_id_set_label_string(id, label, GFS_LOCKNAME_LEN);
+               }
+               if (vers == 2 && uuid_non_zero(sbd->sb_uuid))
+                       volume_id_set_uuid(id, sbd->sb_uuid, 0, UUID_DCE);
                strcpy(id->type_version, "1");
                volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
                return 0;
@@ -109,12 +135,12 @@ static int volume_id_probe_gfs_generic(struct volume_id *id, uint64_t off, int v
        return -1;
 }
 
-int volume_id_probe_gfs(struct volume_id *id, uint64_t off)
+int volume_id_probe_gfs(struct volume_id *id, uint64_t off, uint64_t size)
 {
        return volume_id_probe_gfs_generic(id, off, 1);
 }
 
-int volume_id_probe_gfs2(struct volume_id *id, uint64_t off)
+int volume_id_probe_gfs2(struct volume_id *id, uint64_t off, uint64_t size)
 {
        return volume_id_probe_gfs_generic(id, off, 2);
 }