From: Davidlohr Bueso <dave@gnu.org>
Date: Thu, 7 Oct 2010 14:48:22 +0000 (-0400)
Subject: partx: add sun partition table support
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=aadd32ea8e570af2ae4a76926b97b496b8187d57;p=util-linux

partx: add sun partition table support

Signed-off-by: Davidlohr Bueso <dave@gnu.org>
---

diff --git a/partx/sun.c b/partx/sun.c
new file mode 100644
index 00000000..c8143686
--- /dev/null
+++ b/partx/sun.c
@@ -0,0 +1,134 @@
+/*
+ * Lifted from kpartx's sun.c
+ *
+ * Copyrights of the original file apply
+ * Copyright (c) 2007 Hannes Reinecke
+ *
+ * Integrated to partx (utils-linux-ng)
+ *       Davidlohr Bueso <dave@gnu.org>
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#include "bitops.h"
+#include "partx.h"
+
+#define SUN_DISK_MAGIC		0xDABE	/* Disk magic number */
+#define SUN_DISK_MAXPARTITIONS	8
+
+struct __attribute__ ((packed)) sun_raw_part {
+	u_int32_t	start_cylinder; /* where the part starts... */
+	u_int32_t	num_sectors;	/* ...and it's length */
+};
+
+struct __attribute__ ((packed)) sun_part_info {
+	u_int8_t	spare1;
+	u_int8_t	id;		/* Partition type */
+	u_int8_t	spare2;
+	u_int8_t	flags;		/* Partition flags */
+};
+
+struct __attribute__ ((packed)) sun_disk_label {
+	char		info[128];	/* Informative text string */
+	u_int8_t	spare0[14];
+	struct sun_part_info infos[SUN_DISK_MAXPARTITIONS];
+	u_int8_t	spare1[246];	/* Boot information etc. */
+	u_int16_t	rspeed;		/* Disk rotational speed */
+	u_int16_t	pcylcount;	/* Physical cylinder count */
+	u_int16_t	sparecyl;	/* extra sects per cylinder */
+	u_int8_t	spare2[4];	/* More magic... */
+	u_int16_t	ilfact;		/* Interleave factor */
+	u_int16_t	ncyl;		/* Data cylinder count */
+	u_int16_t	nacyl;		/* Alt. cylinder count */
+	u_int16_t	ntrks;		/* Tracks per cylinder */
+	u_int16_t	nsect;		/* Sectors per track */
+	u_int8_t	spare3[4];	/* Even more magic... */
+	struct sun_raw_part partitions[SUN_DISK_MAXPARTITIONS];
+	u_int16_t	magic;		/* Magic number */
+	u_int16_t	csum;		/* Label xor'd checksum */
+};
+
+/* Checksum Verification */
+static int
+sun_verify_checksum (struct sun_disk_label *label)
+{
+	u_int16_t *ush = ((u_int16_t *)(label + 1)) - 1;
+	u_int16_t csum = 0;
+
+	while (ush >= (u_int16_t *)label)
+		csum ^= *ush--;
+
+	return !csum;
+}
+
+int
+read_sun_pt(int fd, struct slice all, struct slice *sp, int ns) {
+	struct sun_disk_label *l;
+	struct sun_raw_part *s;
+	unsigned int offset = all.start, end;
+	int i, j, n;
+	char *bp;
+
+	bp = getblock(fd, offset);
+	if (bp == NULL)
+		return -1;
+
+	l = (struct sun_disk_label *) bp;
+	if(be16_to_cpu(l->magic) != SUN_DISK_MAGIC)
+		return -1;
+
+	if (!sun_verify_checksum(l)) {
+		fprintf(stderr, "Corrupted Sun disk label\n");
+		return -1;
+	}
+
+	for(i=0, n=0; i<SUN_DISK_MAXPARTITIONS; i++) {
+		s = &l->partitions[i];
+
+		if (s->num_sectors == 0)
+			continue;
+		if (n < ns) {
+			sp[n].start = offset +
+				be32_to_cpu(s->start_cylinder) * be16_to_cpu(l->nsect) * be16_to_cpu(l->ntrks);
+			sp[n].size = be32_to_cpu(s->num_sectors);
+			n++;
+		} else {
+			fprintf(stderr,
+				"sun_disklabel: too many slices\n");
+			break;
+		}
+	}
+	/*
+	 * Convention has it that the SUN disklabel will always have
+	 * the 'c' partition spanning the entire disk.
+	 * So we have to check for contained slices.
+	 */
+	for(i = 0; i < SUN_DISK_MAXPARTITIONS; i++) {
+		if (sp[i].size == 0)
+			continue;
+
+		end = sp[i].start + sp[i].size;
+		for(j = 0; j < SUN_DISK_MAXPARTITIONS; j ++) {
+			if ( i == j )
+				continue;
+			if (sp[j].size == 0)
+				continue;
+
+			if (sp[i].start < sp[j].start) {
+				if (end > sp[j].start &&
+				    end < sp[j].start + sp[j].size) {
+					/* Invalid slice */
+					fprintf(stderr,
+						"sun_disklabel: slice %d overlaps with %d\n", i , j);
+					sp[i].size = 0;
+				}
+			} else {
+				if (end <= sp[j].start + sp[j].size) {
+					sp[i].container = j + 1;
+				}
+			}
+		}
+	}
+	return n;
+}