From cfe5e3905201349e9cf3f95d52ff4bd100bde37d Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 14 Apr 2024 21:10:49 +0200
Subject: Adding upstream version 2.39.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 libblkid/src/superblocks/jmicron_raid.c | 114 ++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 libblkid/src/superblocks/jmicron_raid.c

(limited to 'libblkid/src/superblocks/jmicron_raid.c')

diff --git a/libblkid/src/superblocks/jmicron_raid.c b/libblkid/src/superblocks/jmicron_raid.c
new file mode 100644
index 0000000..65e05b6
--- /dev/null
+++ b/libblkid/src/superblocks/jmicron_raid.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
+ *
+ * Inspired by libvolume_id by
+ *     Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "superblocks.h"
+
+#define JM_SIGNATURE		"JM"
+#define JM_MINOR_VERSION(_x)	(le16_to_cpu((_x)->version) & 0xFF)
+#define JM_MAJOR_VERSION(_x)	(le16_to_cpu((_x)->version) >> 8)
+#define JM_SPARES		2
+#define JM_MEMBERS		8
+
+struct jm_metadata {
+	int8_t		signature[2];	/* 0x0 - 0x01 */
+
+	uint16_t	version;	/* 0x03 - 0x04 JMicron version */
+
+	uint16_t	checksum;	/* 0x04 - 0x05 */
+	uint8_t		filler[10];
+
+	uint32_t	identity;	/* 0x10 - 0x13 */
+
+	struct {
+		uint32_t	base;	/* 0x14 - 0x17 */
+		uint32_t	range;	/* 0x18 - 0x1B range */
+		uint16_t	range2;	/* 0x1C - 0x1D range2 */
+	} segment;
+
+	int8_t		name[16];	/* 0x20 - 0x2F */
+
+	uint8_t		mode;		/* 0x30 RAID level */
+	uint8_t		block;		/* 0x31 stride size (2=4K, 3=8K, ...) */
+	uint16_t	attribute;	/* 0x32 - 0x33 */
+	uint8_t		filler1[4];
+
+	uint32_t	spare[JM_SPARES];	/* 0x38 - 0x3F */
+	uint32_t	member[JM_MEMBERS];	/* 0x40 - 0x5F */
+
+	uint8_t		filler2[0x20];
+} __attribute__ ((packed));
+
+static int jm_checksum(blkid_probe pr, const struct jm_metadata *jm)
+{
+	size_t count = sizeof(*jm) / sizeof(uint16_t);
+	uint16_t sum = 0;
+	unsigned char *ptr = (unsigned char *) jm;
+
+	while (count--) {
+		uint16_t val;
+
+		memcpy(&val, ptr, sizeof(uint16_t));
+		sum += le16_to_cpu(val);
+
+		ptr += sizeof(uint16_t);
+	}
+
+	return blkid_probe_verify_csum(pr, sum == 0 || sum == 1, 1);
+}
+
+static int probe_jmraid(blkid_probe pr,
+		const struct blkid_idmag *mag __attribute__((__unused__)))
+{
+	uint64_t off;
+	const struct jm_metadata *jm;
+
+	if (pr->size < 0x10000)
+		return 1;
+	if (!S_ISREG(pr->mode) && !blkid_probe_is_wholedisk(pr))
+		return 1;
+
+	off = ((pr->size / 0x200) - 1) * 0x200;
+	jm = (struct jm_metadata *)
+		blkid_probe_get_buffer(pr,
+				off,
+				sizeof(struct jm_metadata));
+	if (!jm)
+		return errno ? -errno : 1;
+
+	if (memcmp(jm->signature, JM_SIGNATURE, sizeof(JM_SIGNATURE) - 1) != 0)
+		return 1;
+
+	if (!jm_checksum(pr, jm))
+		return 1;
+
+	if (jm->mode > 5)
+		return 1;
+
+	if (blkid_probe_sprintf_version(pr, "%u.%u",
+			JM_MAJOR_VERSION(jm), JM_MINOR_VERSION(jm)) != 0)
+		return 1;
+	if (blkid_probe_set_magic(pr, off, sizeof(jm->signature),
+				(unsigned char *) jm->signature))
+		return 1;
+	return 0;
+}
+
+const struct blkid_idinfo jmraid_idinfo = {
+	.name		= "jmicron_raid_member",
+	.usage		= BLKID_USAGE_RAID,
+	.probefunc	= probe_jmraid,
+	.magics		= BLKID_NONE_MAGIC
+};
-- 
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