Adding upstream version 2.38.1.upstream/2.38.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 187 insertions, 0 deletions

diff --git a/libblkid/src/superblocks/minix.c b/libblkid/src/superblocks/minix.c
new file mode 100644
index 0000000..b521efb
--- /dev/null
+++ b/libblkid/src/superblocks/minix.c
@@ -0,0 +1,187 @@
+/*
+ * Copyright (C) 1999 by Andries Brouwer
+ * Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
+ * Copyright (C) 2001 by Andreas Dilger
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2008-2013 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <string.h>
+#include "superblocks.h"
+#include "minix.h"
+
+#define minix_swab16(doit, num)	((uint16_t) (doit ? swab16(num) : num))
+#define minix_swab32(doit, num)	((uint32_t) (doit ? swab32(num) : num))
+
+static int get_minix_version(const unsigned char *data, int *other_endian)
+{
+	const struct minix_super_block *sb = (const struct minix_super_block *) data;
+	const struct minix3_super_block *sb3 = (const struct minix3_super_block *) data;
+	int version = 0;
+	char *endian;
+
+	*other_endian = 0;
+
+	switch (sb->s_magic) {
+	case MINIX_SUPER_MAGIC:
+	case MINIX_SUPER_MAGIC2:
+		version = 1;
+		break;
+	case MINIX2_SUPER_MAGIC:
+	case MINIX2_SUPER_MAGIC2:
+		version = 2;
+		break;
+	default:
+		if (sb3->s_magic == MINIX3_SUPER_MAGIC)
+			version = 3;
+		break;
+	}
+
+	if (!version) {
+		*other_endian = 1;
+
+		switch (swab16(sb->s_magic)) {
+		case MINIX_SUPER_MAGIC:
+		case MINIX_SUPER_MAGIC2:
+			version = 1;
+			break;
+		case MINIX2_SUPER_MAGIC:
+		case MINIX2_SUPER_MAGIC2:
+			version = 2;
+			break;
+		default:
+			if (sb3->s_magic == MINIX3_SUPER_MAGIC)
+				version = 3;
+			break;
+		}
+	}
+	if (!version)
+		return -1;
+
+#if defined(WORDS_BIGENDIAN)
+	endian = *other_endian ? "LE" : "BE";
+#else
+	endian = *other_endian ? "BE" : "LE";
+#endif
+	DBG(LOWPROBE, ul_debug("minix version %d detected [%s]", version,
+			       endian));
+	return version;
+}
+
+static int probe_minix(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	unsigned char *ext;
+	const unsigned char *data;
+	int version = 0, swabme = 0;
+	unsigned long zones, ninodes, imaps, zmaps;
+	off_t firstz;
+	size_t zone_size;
+	unsigned block_size;
+
+	data = blkid_probe_get_buffer(pr, 1024,
+			max(sizeof(struct minix_super_block),
+			    sizeof(struct minix3_super_block)));
+	if (!data)
+		return errno ? -errno : 1;
+	version = get_minix_version(data, &swabme);
+	switch (version) {
+	case 1:
+	case 2: {
+		const struct minix_super_block *sb = (const struct minix_super_block *) data;
+
+		uint16_t state = minix_swab16(swabme, sb->s_state);
+		if ((state & (MINIX_VALID_FS | MINIX_ERROR_FS)) != state)
+			return 1;
+
+		zones = version == 2 ? minix_swab32(swabme, sb->s_zones) :
+				       minix_swab16(swabme, sb->s_nzones);
+		ninodes = minix_swab16(swabme, sb->s_ninodes);
+		imaps   = minix_swab16(swabme, sb->s_imap_blocks);
+		zmaps   = minix_swab16(swabme, sb->s_zmap_blocks);
+		firstz  = minix_swab16(swabme, sb->s_firstdatazone);
+		zone_size = sb->s_log_zone_size;
+		block_size = 1024;
+		break;
+	}
+	case 3: {
+		const struct minix3_super_block *sb = (const struct minix3_super_block *) data;
+
+		zones = minix_swab32(swabme, sb->s_zones);
+		ninodes = minix_swab32(swabme, sb->s_ninodes);
+		imaps   = minix_swab16(swabme, sb->s_imap_blocks);
+		zmaps   = minix_swab16(swabme, sb->s_zmap_blocks);
+		firstz  = minix_swab16(swabme, sb->s_firstdatazone);
+		zone_size = sb->s_log_zone_size;
+		block_size = minix_swab16(swabme, sb->s_blocksize);
+
+		break;
+	}
+	default:
+		return 1;
+	}
+
+	/* sanity checks to be sure that the FS is really minix.
+	 * see disk-utils/fsck.minix.c read_superblock
+	 */
+	if (zone_size != 0 || ninodes == 0 || ninodes == UINT32_MAX)
+		return 1;
+	if (imaps * MINIX_BLOCK_SIZE * 8 < ninodes + 1)
+		return 1;
+	if (firstz > (off_t) zones)
+		return 1;
+	if (zmaps * MINIX_BLOCK_SIZE * 8 < zones - firstz + 1)
+		return 1;
+
+	/* unfortunately, some parts of ext3 is sometimes possible to
+	 * interpreted as minix superblock. So check for extN magic
+	 * string. (For extN magic string and offsets see ext.c.)
+	 */
+	ext = blkid_probe_get_buffer(pr, 0x400 + 0x38, 2);
+	if (!ext)
+		return errno ? -errno : 1;
+
+	if (memcmp(ext, "\123\357", 2) == 0)
+		return 1;
+
+	blkid_probe_sprintf_version(pr, "%d", version);
+	blkid_probe_set_block_size(pr, block_size);
+	return 0;
+}
+
+const struct blkid_idinfo minix_idinfo =
+{
+	.name		= "minix",
+	.usage		= BLKID_USAGE_FILESYSTEM,
+	.probefunc	= probe_minix,
+	.magics		=
+	{
+		/* version 1 - LE */
+		{ .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 1 - BE */
+		{ .magic = "\023\177", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\023\217", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 2 - LE */
+		{ .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 2 - BE */
+		{ .magic = "\044\150", .len = 2, .kboff = 1, .sboff = 0x10 },
+		{ .magic = "\044\170", .len = 2, .kboff = 1, .sboff = 0x10 },
+
+		/* version 3 - LE */
+		{ .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 },
+
+		/* version 3 - BE */
+		{ .magic = "\115\132", .len = 2, .kboff = 1, .sboff = 0x18 },
+
+		{ NULL }
+	}
+};
+