1493bf217f
Make the following changes to partition check code. * Add ->bdev to struct parsed_partitions. * Introduce read_part_sector() which is a simple wrapper around read_dev_sector() which takes struct parsed_partitions *state instead of @bdev. * For functions which used to take @state and @bdev, drop @bdev. For functions which used to take @bdev, replace it with @state. * While updating, drop superflous checks on NULL state/bdev in ldm.c. This cleans up the API a bit and enables better handling of IO errors during partition check as the generic partition check code now has much better visibility into what went wrong in the low level code paths. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Ben Hutchings <ben@decadent.org.uk> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/*
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* fs/partitions/amiga.c
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*
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* Code extracted from drivers/block/genhd.c
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*
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* Copyright (C) 1991-1998 Linus Torvalds
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* Re-organised Feb 1998 Russell King
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*/
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#include <linux/types.h>
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#include <linux/affs_hardblocks.h>
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#include "check.h"
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#include "amiga.h"
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static __inline__ u32
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checksum_block(__be32 *m, int size)
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{
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u32 sum = 0;
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while (size--)
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sum += be32_to_cpu(*m++);
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return sum;
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}
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int amiga_partition(struct parsed_partitions *state)
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{
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Sector sect;
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unsigned char *data;
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struct RigidDiskBlock *rdb;
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struct PartitionBlock *pb;
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int start_sect, nr_sects, blk, part, res = 0;
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int blksize = 1; /* Multiplier for disk block size */
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int slot = 1;
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char b[BDEVNAME_SIZE];
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for (blk = 0; ; blk++, put_dev_sector(sect)) {
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if (blk == RDB_ALLOCATION_LIMIT)
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goto rdb_done;
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data = read_part_sector(state, blk, §);
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if (!data) {
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if (warn_no_part)
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printk("Dev %s: unable to read RDB block %d\n",
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bdevname(state->bdev, b), blk);
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res = -1;
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goto rdb_done;
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}
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if (*(__be32 *)data != cpu_to_be32(IDNAME_RIGIDDISK))
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continue;
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rdb = (struct RigidDiskBlock *)data;
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if (checksum_block((__be32 *)data, be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F) == 0)
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break;
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/* Try again with 0xdc..0xdf zeroed, Windows might have
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* trashed it.
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*/
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*(__be32 *)(data+0xdc) = 0;
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if (checksum_block((__be32 *)data,
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be32_to_cpu(rdb->rdb_SummedLongs) & 0x7F)==0) {
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printk("Warning: Trashed word at 0xd0 in block %d "
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"ignored in checksum calculation\n",blk);
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break;
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}
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printk("Dev %s: RDB in block %d has bad checksum\n",
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bdevname(state->bdev, b), blk);
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}
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/* blksize is blocks per 512 byte standard block */
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blksize = be32_to_cpu( rdb->rdb_BlockBytes ) / 512;
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printk(" RDSK (%d)", blksize * 512); /* Be more informative */
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blk = be32_to_cpu(rdb->rdb_PartitionList);
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put_dev_sector(sect);
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for (part = 1; blk>0 && part<=16; part++, put_dev_sector(sect)) {
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blk *= blksize; /* Read in terms partition table understands */
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data = read_part_sector(state, blk, §);
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if (!data) {
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if (warn_no_part)
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printk("Dev %s: unable to read partition block %d\n",
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bdevname(state->bdev, b), blk);
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res = -1;
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goto rdb_done;
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}
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pb = (struct PartitionBlock *)data;
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blk = be32_to_cpu(pb->pb_Next);
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if (pb->pb_ID != cpu_to_be32(IDNAME_PARTITION))
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continue;
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if (checksum_block((__be32 *)pb, be32_to_cpu(pb->pb_SummedLongs) & 0x7F) != 0 )
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continue;
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/* Tell Kernel about it */
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nr_sects = (be32_to_cpu(pb->pb_Environment[10]) + 1 -
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be32_to_cpu(pb->pb_Environment[9])) *
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be32_to_cpu(pb->pb_Environment[3]) *
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be32_to_cpu(pb->pb_Environment[5]) *
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blksize;
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if (!nr_sects)
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continue;
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start_sect = be32_to_cpu(pb->pb_Environment[9]) *
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be32_to_cpu(pb->pb_Environment[3]) *
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be32_to_cpu(pb->pb_Environment[5]) *
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blksize;
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put_partition(state,slot++,start_sect,nr_sects);
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{
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/* Be even more informative to aid mounting */
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char dostype[4];
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__be32 *dt = (__be32 *)dostype;
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*dt = pb->pb_Environment[16];
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if (dostype[3] < ' ')
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printk(" (%c%c%c^%c)",
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dostype[0], dostype[1],
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dostype[2], dostype[3] + '@' );
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else
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printk(" (%c%c%c%c)",
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dostype[0], dostype[1],
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dostype[2], dostype[3]);
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printk("(res %d spb %d)",
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be32_to_cpu(pb->pb_Environment[6]),
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be32_to_cpu(pb->pb_Environment[4]));
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}
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res = 1;
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}
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printk("\n");
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rdb_done:
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return res;
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}
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