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authorAl Viro <viro@zeniv.linux.org.uk>2011-09-16 00:25:05 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-01-03 22:54:06 -0500
commit9be96f3fd10187f185d84cf878cf032465bcced3 (patch)
tree432a430ed9e0cbe0c18916cd3c3992f09b3feb37 /block/partitions/amiga.c
parent4752bc309b7604d507c973c7b7678ac2ce10a058 (diff)
downloadlinux-0-day-9be96f3fd10187f185d84cf878cf032465bcced3.tar.gz
move fs/partitions to block/
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/partitions/amiga.c')
-rw-r--r--block/partitions/amiga.c139
1 files changed, 139 insertions, 0 deletions
diff --git a/block/partitions/amiga.c b/block/partitions/amiga.c
new file mode 100644
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;
+}