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-rw-r--r--fs/partitions/sun.c62
1 files changed, 45 insertions, 17 deletions
diff --git a/fs/partitions/sun.c b/fs/partitions/sun.c
index 123f8b46c8ba..794118da4ef3 100644
--- a/fs/partitions/sun.c
+++ b/fs/partitions/sun.c
@@ -19,34 +19,47 @@ int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
Sector sect;
struct sun_disklabel {
unsigned char info[128]; /* Informative text string */
- unsigned char spare0[14];
- struct sun_info {
- unsigned char spare1;
- unsigned char id;
- unsigned char spare2;
- unsigned char flags;
- } infos[8];
- unsigned char spare[246]; /* Boot information etc. */
+ struct sun_vtoc {
+ __be32 version; /* Layout version */
+ char volume[8]; /* Volume name */
+ __be16 nparts; /* Number of partitions */
+ struct sun_info { /* Partition hdrs, sec 2 */
+ __be16 id;
+ __be16 flags;
+ } infos[8];
+ __be16 padding; /* Alignment padding */
+ __be32 bootinfo[3]; /* Info needed by mboot */
+ __be32 sanity; /* To verify vtoc sanity */
+ __be32 reserved[10]; /* Free space */
+ __be32 timestamp[8]; /* Partition timestamp */
+ } vtoc;
+ __be32 write_reinstruct; /* sectors to skip, writes */
+ __be32 read_reinstruct; /* sectors to skip, reads */
+ unsigned char spare[148]; /* Padding */
__be16 rspeed; /* Disk rotational speed */
__be16 pcylcount; /* Physical cylinder count */
__be16 sparecyl; /* extra sects per cylinder */
- unsigned char spare2[4]; /* More magic... */
+ __be16 obs1; /* gap1 */
+ __be16 obs2; /* gap2 */
__be16 ilfact; /* Interleave factor */
__be16 ncyl; /* Data cylinder count */
__be16 nacyl; /* Alt. cylinder count */
__be16 ntrks; /* Tracks per cylinder */
__be16 nsect; /* Sectors per track */
- unsigned char spare3[4]; /* Even more magic... */
+ __be16 obs3; /* bhead - Label head offset */
+ __be16 obs4; /* ppart - Physical Partition */
struct sun_partition {
__be32 start_cylinder;
__be32 num_sectors;
} partitions[8];
__be16 magic; /* Magic number */
__be16 csum; /* Label xor'd checksum */
- } * label;
+ } * label;
struct sun_partition *p;
unsigned long spc;
char b[BDEVNAME_SIZE];
+ int use_vtoc;
+ int nparts;
label = (struct sun_disklabel *)read_dev_sector(bdev, 0, &sect);
if (!label)
@@ -70,9 +83,22 @@ int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
return 0;
}
- /* All Sun disks have 8 partition entries */
+ /* Check to see if we can use the VTOC table */
+ use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) &&
+ (be32_to_cpu(label->vtoc.version) == 1) &&
+ (be16_to_cpu(label->vtoc.nparts) <= 8));
+
+ /* Use 8 partition entries if not specified in validated VTOC */
+ nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8;
+
+ /*
+ * So that old Linux-Sun partitions continue to work,
+ * alow the VTOC to be used under the additional condition ...
+ */
+ use_vtoc = use_vtoc || !(label->vtoc.sanity |
+ label->vtoc.version | label->vtoc.nparts);
spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
- for (i = 0; i < 8; i++, p++) {
+ for (i = 0; i < nparts; i++, p++) {
unsigned long st_sector;
unsigned int num_sectors;
@@ -81,10 +107,12 @@ int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
if (num_sectors) {
put_partition(state, slot, st_sector, num_sectors);
state->parts[slot].flags = 0;
- if (label->infos[i].id == LINUX_RAID_PARTITION)
- state->parts[slot].flags |= ADDPART_FLAG_RAID;
- if (label->infos[i].id == SUN_WHOLE_DISK)
- state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
+ if (use_vtoc) {
+ if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION)
+ state->parts[slot].flags |= ADDPART_FLAG_RAID;
+ else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK)
+ state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK;
+ }
}
slot++;
}