Subject: [PATCH 5/6] partx: add sun partition table support
Signed-off-by: Davidlohr Bueso <dave@xxxxxxx>
---
partx/sun.c | 135 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 135 insertions(+), 0 deletions(-)
create mode 100644 partx/sun.c
diff --git a/partx/sun.c b/partx/sun.c
new file mode 100644
index 0000000..0dac6b1
--- /dev/null
+++ b/partx/sun.c
@@ -0,0 +1,135 @@
+/*
+ * 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@xxxxxxx>
+ */
+
+#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;
+}
+
--
1.7.0.4
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