1 files changed, 128 insertions, 0 deletions

diff --git a/fs/partitions/amiga.c b/fs/partitions/amiga.c
new file mode 100644
index 000000000000..3068528890a6
--- /dev/null
+++ b/fs/partitions/amiga.c
@@ -0,0 +1,128 @@
+/*
+ *  fs/partitions/amiga.c
+ *
+ *  Code extracted from drivers/block/genhd.c
+ *
+ *  Copyright (C) 1991-1998  Linus Torvalds
+ *  Re-organised Feb 1998 Russell King
+ */
+
+#include <linux/types.h>
+#include <linux/affs_hardblocks.h>
+
+#include "check.h"
+#include "amiga.h"
+
+static __inline__ u32
+checksum_block(__be32 *m, int size)
+{
+        u32 sum = 0;
+
+        while (size--)
+                sum += be32_to_cpu(*m++);
+        return sum;
+}
+
+int
+amiga_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+        Sector sect;
+        unsigned char *data;
+        struct RigidDiskBlock *rdb;
+        struct PartitionBlock *pb;
+        int start_sect, nr_sects, blk, part, res = 0;
+        int blksize = 1;        /* Multiplier for disk block size */
+        int slot = 1;
+        char b[BDEVNAME_SIZE];
+
+        for (blk = 0; ; blk++, put_dev_sector(sect)) {
+                if (blk == RDB_ALLOCATION_LIMIT)
+                        goto rdb_done;
+                data = read_dev_sector(bdev, blk, &sect);
+                if (!data) {
+                        if (warn_no_part)
+                                printk("Dev %s: unable to read RDB block %d\n",
+                                       bdevname(bdev, b), blk);
+                        goto rdb_done;
+                }
+                if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
+                        continue;
+
+                rdb = (struct RigidDiskBlock *)data;
+                if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
+                        break;
+                /* Try again with 0xdc..0xdf zeroed, Windows might have
+                 * trashed it.
+                 */
+                *(__be32 *)(data+0xdc) = 0;
+                if (checksum_block((__be32 *)data,
+                                be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
+                        printk("Warning: Trashed word at 0xd0 in block %d "
+                                "ignored in checksum calculation\n",blk);
+                        break;
+                }
+
+                printk("Dev %s: RDB in block %d has bad checksum\n",
+                               bdevname(bdev, b), blk);
+        }
+
+        /* blksize is blocks per 512 byte standard block */
+        blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
+
+        printk(" RDSK (%d)", blksize * 512);    /* Be more informative */
+        blk = be32_to_cpu(rdb->rdb_PartitionList);
+        put_dev_sector(sect);
+        for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
+                blk *= blksize; /* Read in terms partition table understands */
+                data = read_dev_sector(bdev, blk, &sect);
+                if (!data) {
+                        if (warn_no_part)
+                                printk("Dev %s: unable to read partition block %d\n",
+                                       bdevname(bdev, b), blk);
+                        goto rdb_done;
+                }
+                pb  = (struct PartitionBlock *)data;
+                blk = be32_to_cpu(pb->pb_Next);
+                if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
+                        continue;
+                if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
+                        continue;
+
+                /* Tell Kernel about it */
+
+                nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
+                            be32_to_cpu(pb->pb_Environment[9])) *
+                           be32_to_cpu(pb->pb_Environment[3]) *
+                           be32_to_cpu(pb->pb_Environment[5]) *
+                           blksize;
+                if (!nr_sects)
+                        continue;
+                start_sect = be32_to_cpu(pb->pb_Environment[9]) *
+                             be32_to_cpu(pb->pb_Environment[3]) *
+                             be32_to_cpu(pb->pb_Environment[5]) *
+                             blksize;
+                put_partition(state,slot++,start_sect,nr_sects);
+                {
+                        /* Be even more informative to aid mounting */
+                        char dostype[4];
+                        __be32 *dt = (__be32 *)dostype;
+                        *dt = pb->pb_Environment[16];
+                        if (dostype[3] < ' ')
+                                printk(" (%c%c%c^%c)",
+                                        dostype[0], dostype[1],
+                                        dostype[2], dostype[3] + '@' );
+                        else
+                                printk(" (%c%c%c%c)",
+                                        dostype[0], dostype[1],
+                                        dostype[2], dostype[3]);
+                        printk("(res %d spb %d)",
+                                be32_to_cpu(pb->pb_Environment[6]),
+                                be32_to_cpu(pb->pb_Environment[4]));
+                }
+                res = 1;
+        }
+        printk("\n");
+
+rdb_done:
+        return res;
+}