1 files changed, 122 insertions, 0 deletions

diff --git a/block/partitions/sun.c b/block/partitions/sun.c
new file mode 100644
index 000000000000..b5b6fcfb3d36
--- /dev/null
+++ b/block/partitions/sun.c
@@ -0,0 +1,122 @@
+/*
+ *  fs/partitions/sun.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include "check.h"
+#include "sun.h"
+
+int sun_partition(struct parsed_partitions *state)
+{
+        int i;
+        __be16 csum;
+        int slot = 1;
+        __be16 *ush;
+        Sector sect;
+        struct sun_disklabel {
+                unsigned char info[128];   /* Informative text string */
+                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 */
+                __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 */
+                __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;
+        struct sun_partition *p;
+        unsigned long spc;
+        char b[BDEVNAME_SIZE];
+        int use_vtoc;
+        int nparts;
+
+        label = read_part_sector(state, 0, &sect);
+        if (!label)
+                return -1;
+
+        p = label->partitions;
+        if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
+/*              printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
+                       bdevname(bdev, b), be16_to_cpu(label->magic)); */
+                put_dev_sector(sect);
+                return 0;
+        }
+        /* Look at the checksum */
+        ush = ((__be16 *) (label+1)) - 1;
+        for (csum = 0; ush >= ((__be16 *) label);)
+                csum ^= *ush--;
+        if (csum) {
+                printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
+                       bdevname(state->bdev, b));
+                put_dev_sector(sect);
+                return 0;
+        }
+
+        /* 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 < nparts; i++, p++) {
+                unsigned long st_sector;
+                unsigned int num_sectors;
+
+                st_sector = be32_to_cpu(p->start_cylinder) * spc;
+                num_sectors = be32_to_cpu(p->num_sectors);
+                if (num_sectors) {
+                        put_partition(state, slot, st_sector, num_sectors);
+                        state->parts[slot].flags = 0;
+                        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++;
+        }
+        strlcat(state->pp_buf, "\n", PAGE_SIZE);
+        put_dev_sector(sect);
+        return 1;
+}