1 files changed, 82 insertions, 0 deletions

diff --git a/fs/partitions/sgi.c b/fs/partitions/sgi.c
new file mode 100644
index 000000000000..6fa4ff895104
--- /dev/null
+++ b/fs/partitions/sgi.c
@@ -0,0 +1,82 @@
+/*
+ *  fs/partitions/sgi.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ */
+
+#include "check.h"
+#include "sgi.h"
+
+struct sgi_disklabel {
+        __be32 magic_mushroom;          /* Big fat spliff... */
+        __be16 root_part_num;           /* Root partition number */
+        __be16 swap_part_num;           /* Swap partition number */
+        s8 boot_file[16];               /* Name of boot file for ARCS */
+        u8 _unused0[48];                /* Device parameter useless crapola.. */
+        struct sgi_volume {
+                s8 name[8];             /* Name of volume */
+                __be32 block_num;               /* Logical block number */
+                __be32 num_bytes;               /* How big, in bytes */
+        } volume[15];
+        struct sgi_partition {
+                __be32 num_blocks;              /* Size in logical blocks */
+                __be32 first_block;     /* First logical block */
+                __be32 type;            /* Type of this partition */
+        } partitions[16];
+        __be32 csum;                    /* Disk label checksum */
+        __be32 _unused1;                        /* Padding */
+};
+
+int sgi_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+        int i, csum;
+        __be32 magic;
+        int slot = 1;
+        unsigned int start, blocks;
+        __be32 *ui, cs;
+        Sector sect;
+        struct sgi_disklabel *label;
+        struct sgi_partition *p;
+        char b[BDEVNAME_SIZE];
+
+        label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, &sect);
+        if (!label)
+                return -1;
+        p = &label->partitions[0];
+        magic = label->magic_mushroom;
+        if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) {
+                /*printk("Dev %s SGI disklabel: bad magic %08x\n",
+                       bdevname(bdev, b), be32_to_cpu(magic));*/
+                put_dev_sector(sect);
+                return 0;
+        }
+        ui = ((__be32 *) (label + 1)) - 1;
+        for(csum = 0; ui >= ((__be32 *) label);) {
+                cs = *ui--;
+                csum += be32_to_cpu(cs);
+        }
+        if(csum) {
+                printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n",
+                       bdevname(bdev, b));
+                put_dev_sector(sect);
+                return 0;
+        }
+        /* All SGI disk labels have 16 partitions, disks under Linux only
+         * have 15 minor's.  Luckily there are always a few zero length
+         * partitions which we don't care about so we never overflow the
+         * current_minor.
+         */
+        for(i = 0; i < 16; i++, p++) {
+                blocks = be32_to_cpu(p->num_blocks);
+                start  = be32_to_cpu(p->first_block);
+                if (blocks) {
+                        put_partition(state, slot, start, blocks);
+                        if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION)
+                                state->parts[slot].flags = 1;
+                }
+                slot++;
+        }
+        printk("\n");
+        put_dev_sector(sect);
+        return 1;
+}