volume_id: enable minix detection

function                                             old     new   delta
volume_id_probe_minix                                  -      87     +87
fs2                                                   64      68      +4
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 1/0 up/down: 91/0)               Total: 91 bytes

Patch by wdlkmpx <wdlkmpx@gmail.com>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/util-linux/volume_id/minix.c b/util-linux/volume_id/minix.c
new file mode 100644
index 000000000..c934f9ead
--- /dev/null
+++ b/util-linux/volume_id/minix.c
@@ -0,0 +1,91 @@
+/*
+ * 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
+ */
+//config:config FEATURE_VOLUMEID_MINIX
+//config:	bool "minix filesystem"
+//config:	default y
+//config:	depends on VOLUMEID
+
+//kbuild:lib-$(CONFIG_FEATURE_VOLUMEID_MINIX) += minix.o
+
+#include "volume_id_internal.h"
+
+struct minix_super_block {
+	uint16_t	s_ninodes;
+	uint16_t	s_nzones;
+	uint16_t	s_imap_blocks;
+	uint16_t	s_zmap_blocks;
+	uint16_t	s_firstdatazone;
+	uint16_t	s_log_zone_size;
+	uint32_t	s_max_size;
+	uint16_t	s_magic;
+	uint16_t	s_state;
+	uint32_t	s_zones;
+} PACKED;
+
+/* V3 minix super-block data on disk */
+struct minix3_super_block {
+	uint32_t	s_ninodes;
+	uint16_t	s_pad0;
+	uint16_t	s_imap_blocks;
+	uint16_t	s_zmap_blocks;
+	uint16_t	s_firstdatazone;
+	uint16_t	s_log_zone_size;
+	uint16_t	s_pad1;
+	uint32_t	s_max_size;
+	uint32_t	s_zones;
+	uint16_t	s_magic;
+	uint16_t	s_pad2;
+	uint16_t	s_blocksize;
+	uint8_t		s_disk_version;
+} PACKED;
+
+#define MINIX_SUPERBLOCK_OFFSET 0x400
+
+int FAST_FUNC volume_id_probe_minix(struct volume_id *id /*, uint64_t off*/)
+{
+#define off ((uint64_t)0)
+	struct minix_super_block *ms;
+	struct minix3_super_block *ms3;
+
+	dbg("probing at offset 0x%llx", (unsigned long long) off);
+
+	ms = volume_id_get_buffer(id, off + MINIX_SUPERBLOCK_OFFSET, 0x200);
+	if (ms == NULL)
+		return -1;
+	if (ms->s_magic == cpu_to_le16(0x137F)) /* minix V1 fs, 14 char names */
+		goto found;
+	if (ms->s_magic == cpu_to_le16(0x138F)) /* minix V1 fs, 30 char names */
+		goto found;
+	if (ms->s_magic == cpu_to_le16(0x2468)) /* minix V2 fs, 14 char names */
+		goto found;
+	if (ms->s_magic == cpu_to_le16(0x2478)) /* minix V2 fs, 30 char names */
+		goto found;
+
+	ms3 = (void*)ms;
+	if (ms3->s_magic == cpu_to_le16(0x4d5a)) /* minix V3 fs, 60 char names */
+		goto found;
+
+	return -1;
+
+ found:
+//	volume_id_set_usage(id, VOLUME_ID_FILESYSTEM);
+	IF_FEATURE_BLKID_TYPE(id->type = "minix";)
+	return 0;
+}