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/*

 *  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 = ADDPART_FLAG_RAID;

                }

                slot++;

        }

        printk("\n");

        put_dev_sector(sect);

        return 1;

}