+/*
+ * volume_id - reads filesystem label and uuid
+ *
+ * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.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 "sysv.h"
+
+#define SYSV_NICINOD 100
+#define SYSV_NICFREE 50
+
+struct sysv_super
+{
+ __u16 s_isize;
+ __u16 s_pad0;
+ __u32 s_fsize;
+ __u16 s_nfree;
+ __u16 s_pad1;
+ __u32 s_free[SYSV_NICFREE];
+ __u16 s_ninode;
+ __u16 s_pad2;
+ __u16 s_inode[SYSV_NICINOD];
+ __u8 s_flock;
+ __u8 s_ilock;
+ __u8 s_fmod;
+ __u8 s_ronly;
+ __u32 s_time;
+ __u16 s_dinfo[4];
+ __u32 s_tfree;
+ __u16 s_tinode;
+ __u16 s_pad3;
+ __u8 s_fname[6];
+ __u8 s_fpack[6];
+ __u32 s_fill[12];
+ __u32 s_state;
+ __u32 s_magic;
+ __u32 s_type;
+} __attribute__((__packed__));
+
+#define XENIX_NICINOD 100
+#define XENIX_NICFREE 100
+
+struct xenix_super {
+ __u16 s_isize;
+ __u32 s_fsize;
+ __u16 s_nfree;
+ __u32 s_free[XENIX_NICFREE];
+ __u16 s_ninode;
+ __u16 s_inode[XENIX_NICINOD];
+ __u8 s_flock;
+ __u8 s_ilock;
+ __u8 s_fmod;
+ __u8 s_ronly;
+ __u32 s_time;
+ __u32 s_tfree;
+ __u16 s_tinode;
+ __u16 s_dinfo[4];
+ __u8 s_fname[6];
+ __u8 s_fpack[6];
+ __u8 s_clean;
+ __u8 s_fill[371];
+ __u32 s_magic;
+ __u32 s_type;
+} __attribute__((__packed__));
+
+#define SYSV_SUPERBLOCK_BLOCK 0x01
+#define SYSV_MAGIC 0xfd187e20
+#define XENIX_SUPERBLOCK_BLOCK 0x18
+#define XENIX_MAGIC 0x2b5544
+#define SYSV_MAX_BLOCKSIZE 0x800
+
+int volume_id_probe_sysv(struct volume_id *id, __u64 off)
+{
+ struct sysv_super *vs;
+ struct xenix_super *xs;
+ unsigned int boff;
+
+ dbg("probing at offset %llu", off);
+
+ for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
+ vs = (struct sysv_super *)
+ volume_id_get_buffer(id, off + (boff * SYSV_SUPERBLOCK_BLOCK), 0x200);
+ if (vs == NULL)
+ return -1;
+
+ if (vs->s_magic == cpu_to_le32(SYSV_MAGIC) || vs->s_magic == cpu_to_be32(SYSV_MAGIC)) {
+ volume_id_set_label_raw(id, vs->s_fname, 6);
+ volume_id_set_label_string(id, vs->s_fname, 6);
+ id->type = "sysv";
+ goto found;
+ }
+ }
+
+ for (boff = 0x200; boff <= SYSV_MAX_BLOCKSIZE; boff <<= 1) {
+ xs = (struct xenix_super *)
+ volume_id_get_buffer(id, off + (boff + XENIX_SUPERBLOCK_BLOCK), 0x200);
+ if (xs == NULL)
+ return -1;
+
+ if (xs->s_magic == cpu_to_le32(XENIX_MAGIC) || xs->s_magic == cpu_to_be32(XENIX_MAGIC)) {
+ volume_id_set_label_raw(id, xs->s_fname, 6);
+ volume_id_set_label_string(id, xs->s_fname, 6);
+ id->type = "xenix";
+ goto found;
+ }
+ }
+
+ return -1;
+
+found:
+ volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+ return 0;
+}
~ianmdlvl / elogind.git / commitdiff