--- /dev/null
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) Andre Masella <andre@masella.no-ip.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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 <asm/types.h>
+
+#include "volume_id.h"
+#include "logging.h"
+#include "util.h"
+#include "ocfs2.h"
+
+
+/* All these values are taken from ocfs2-tools's ocfs2_fs.h */
+#define OCFS2_VOL_UUID_LEN 16
+#define OCFS2_MAX_VOL_LABEL_LEN 64
+#define OCFS2_SUPERBLOCK_OFFSET 0x2000
+
+
+/* This is the superblock. The OCFS2 header files have structs in structs.
+This is one has been simplified since we only care about the superblock.
+*/
+
+struct ocfs2_super_block {
+ __u8 i_signature[8]; /* Signature for validation */
+ __u32 i_generation; /* Generation number */
+ __s16 i_suballoc_slot; /* Slot suballocator this inode belongs to */
+ __u16 i_suballoc_bit; /* Bit offset in suballocator block group */
+ __u32 i_reserved0;
+ __u32 i_clusters; /* Cluster count */
+ __u32 i_uid; /* Owner UID */
+ __u32 i_gid; /* Owning GID */
+ __u64 i_size; /* Size in bytes */
+ __u16 i_mode; /* File mode */
+ __u16 i_links_count; /* Links count */
+ __u32 i_flags; /* File flags */
+ __u64 i_atime; /* Access time */
+ __u64 i_ctime; /* Creation time */
+ __u64 i_mtime; /* Modification time */
+ __u64 i_dtime; /* Deletion time */
+ __u64 i_blkno; /* Offset on disk, in blocks */
+ __u64 i_last_eb_blk; /* Pointer to last extent block */
+ __u32 i_fs_generation; /* Generation per fs-instance */
+ __u32 i_atime_nsec;
+ __u32 i_ctime_nsec;
+ __u32 i_mtime_nsec;
+ __u64 i_reserved1[9];
+ __u64 i_pad1; /* Generic way to refer to this 64bit union */
+ /* Normally there is a union of the different block types, but we only care about the superblock. */
+ __u16 s_major_rev_level;
+ __u16 s_minor_rev_level;
+ __u16 s_mnt_count;
+ __s16 s_max_mnt_count;
+ __u16 s_state; /* File system state */
+ __u16 s_errors; /* Behaviour when detecting errors */
+ __u32 s_checkinterval; /* Max time between checks */
+ __u64 s_lastcheck; /* Time of last check */
+ __u32 s_creator_os; /* OS */
+ __u32 s_feature_compat; /* Compatible feature set */
+ __u32 s_feature_incompat; /* Incompatible feature set */
+ __u32 s_feature_ro_compat; /* Readonly-compatible feature set */
+ __u64 s_root_blkno; /* Offset, in blocks, of root directory dinode */
+ __u64 s_system_dir_blkno; /* Offset, in blocks, of system directory dinode */
+ __u32 s_blocksize_bits; /* Blocksize for this fs */
+ __u32 s_clustersize_bits; /* Clustersize for this fs */
+ __u16 s_max_slots; /* Max number of simultaneous mounts before tunefs required */
+ __u16 s_reserved1;
+ __u32 s_reserved2;
+ __u64 s_first_cluster_group; /* Block offset of 1st cluster group header */
+ __u8 s_label[OCFS2_MAX_VOL_LABEL_LEN]; /* Label for mounting, etc. */
+ __u8 s_uuid[OCFS2_VOL_UUID_LEN]; /* 128-bit uuid */
+} __attribute__((__packed__));
+
+int volume_id_probe_ocfs2(struct volume_id *id, __u64 off)
+{
+ struct ocfs2_super_block *os;
+
+ dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+ os = (struct ocsf2_super_block *) volume_id_get_buffer(id, off + OCFS2_SUPERBLOCK_OFFSET, 0x200);
+ if (os == NULL)
+ return -1;
+
+ if (strcmp(os->i_signature, "OCFSV2") != 0) {
+ return -1;
+ }
+
+ volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+ volume_id_set_label_raw(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
+ OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
+ volume_id_set_label_string(id, os->s_label, OCFS2_MAX_VOL_LABEL_LEN < VOLUME_ID_LABEL_SIZE ?
+ OCFS2_MAX_VOL_LABEL_LEN : VOLUME_ID_LABEL_SIZE);
+ volume_id_set_uuid(id, os->s_uuid, UUID_DCE);
+ id->type = "ocfs2";
+ return 0;
+}
--- /dev/null
+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) Andre Masella <andre@masella.no-ip.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef _VOLUME_ID_OCFS2_
+#define _VOLUME_ID_OCFS2_
+
+extern int volume_id_probe_ocfs2(struct volume_id *id, __u64 off);
+
+#endif
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