move fs/partitions to block/

[mirror_ubuntu-artful-kernel.git] / block / partitions / amiga.c

diff --git a/block/partitions/amiga.c b/block/partitions/amiga.c
new file mode 100644 (file)
index 0000000..70cbf44
--- /dev/null
+++ b/block/partitions/amiga.c
@@ -0,0 +1,139 @@
+/*
+ *  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)
+{
+       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_part_sector(state, blk, &sect);
+               if (!data) {
+                       if (warn_no_part)
+                               printk("Dev %s: unable to read RDB block %d\n",
+                                      bdevname(state->bdev, b), blk);
+                       res = -1;
+                       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(state->bdev, b), blk);
+       }
+
+       /* blksize is blocks per 512 byte standard block */
+       blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
+
+       {
+               char tmp[7 + 10 + 1 + 1];
+
+               /* Be more informative */
+               snprintf(tmp, sizeof(tmp), " RDSK (%d)", blksize * 512);
+               strlcat(state->pp_buf, tmp, PAGE_SIZE);
+       }
+       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_part_sector(state, blk, &sect);
+               if (!data) {
+                       if (warn_no_part)
+                               printk("Dev %s: unable to read partition block %d\n",
+                                      bdevname(state->bdev, b), blk);
+                       res = -1;
+                       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];
+                       char tmp[42];
+
+                       __be32 *dt = (__be32 *)dostype;
+                       *dt = pb->pb_Environment[16];
+                       if (dostype[3] < ' ')
+                               snprintf(tmp, sizeof(tmp), " (%c%c%c^%c)",
+                                       dostype[0], dostype[1],
+                                       dostype[2], dostype[3] + '@' );
+                       else
+                               snprintf(tmp, sizeof(tmp), " (%c%c%c%c)",
+                                       dostype[0], dostype[1],
+                                       dostype[2], dostype[3]);
+                       strlcat(state->pp_buf, tmp, PAGE_SIZE);
+                       snprintf(tmp, sizeof(tmp), "(res %d spb %d)",
+                               be32_to_cpu(pb->pb_Environment[6]),
+                               be32_to_cpu(pb->pb_Environment[4]));
+                       strlcat(state->pp_buf, tmp, PAGE_SIZE);
+               }
+               res = 1;
+       }
+       strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+rdb_done:
+       return res;
+}