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https://github.com/torvalds/linux
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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>
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/*
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* fs/partitions/mac.c
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*
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* Code extracted from drivers/block/genhd.c
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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/ctype.h>
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#include "check.h"
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#include "mac.h"
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#ifdef CONFIG_PPC_PMAC
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#include <asm/machdep.h>
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extern void note_bootable_part(dev_t dev, int part, int goodness);
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#endif
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/*
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* Code to understand MacOS partition tables.
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*/
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static inline void mac_fix_string(char *stg, int len)
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{
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int i;
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for (i = len - 1; i >= 0 && stg[i] == ' '; i--)
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stg[i] = 0;
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}
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int mac_partition(struct parsed_partitions *state)
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{
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int slot = 1;
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Sector sect;
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unsigned char *data;
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int blk, blocks_in_map;
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unsigned secsize;
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#ifdef CONFIG_PPC_PMAC
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int found_root = 0;
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int found_root_goodness = 0;
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#endif
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struct mac_partition *part;
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struct mac_driver_desc *md;
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/* Get 0th block and look at the first partition map entry. */
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md = read_part_sector(state, 0, §);
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if (!md)
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return -1;
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if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) {
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put_dev_sector(sect);
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return 0;
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}
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secsize = be16_to_cpu(md->block_size);
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put_dev_sector(sect);
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data = read_part_sector(state, secsize/512, §);
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if (!data)
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return -1;
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part = (struct mac_partition *) (data + secsize%512);
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if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) {
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put_dev_sector(sect);
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return 0; /* not a MacOS disk */
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}
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printk(" [mac]");
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blocks_in_map = be32_to_cpu(part->map_count);
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for (blk = 1; blk <= blocks_in_map; ++blk) {
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int pos = blk * secsize;
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put_dev_sector(sect);
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data = read_part_sector(state, pos/512, §);
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if (!data)
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return -1;
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part = (struct mac_partition *) (data + pos%512);
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if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC)
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break;
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put_partition(state, slot,
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be32_to_cpu(part->start_block) * (secsize/512),
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be32_to_cpu(part->block_count) * (secsize/512));
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if (!strnicmp(part->type, "Linux_RAID", 10))
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state->parts[slot].flags = 1;
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#ifdef CONFIG_PPC_PMAC
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/*
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* If this is the first bootable partition, tell the
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* setup code, in case it wants to make this the root.
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*/
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if (machine_is(powermac)) {
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int goodness = 0;
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mac_fix_string(part->processor, 16);
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mac_fix_string(part->name, 32);
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mac_fix_string(part->type, 32);
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if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE)
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&& strcasecmp(part->processor, "powerpc") == 0)
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goodness++;
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if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0
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|| (strnicmp(part->type, "Linux", 5) == 0
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&& strcasecmp(part->type, "Linux_swap") != 0)) {
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int i, l;
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goodness++;
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l = strlen(part->name);
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if (strcmp(part->name, "/") == 0)
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goodness++;
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for (i = 0; i <= l - 4; ++i) {
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if (strnicmp(part->name + i, "root",
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4) == 0) {
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goodness += 2;
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break;
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}
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}
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if (strnicmp(part->name, "swap", 4) == 0)
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goodness--;
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}
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if (goodness > found_root_goodness) {
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found_root = blk;
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found_root_goodness = goodness;
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}
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}
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#endif /* CONFIG_PPC_PMAC */
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++slot;
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}
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#ifdef CONFIG_PPC_PMAC
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if (found_root_goodness)
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note_bootable_part(state->bdev->bd_dev, found_root,
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found_root_goodness);
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#endif
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put_dev_sector(sect);
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printk("\n");
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return 1;
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}
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