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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158// SPDX-License-Identifier: GPL-2.0/* * fs/partitions/mac.c * * Code extracted from drivers/block/genhd.c * Copyright (C) 1991-1998 Linus Torvalds * Re-organised Feb 1998 Russell King */
#include <linux/ctype.h>#include "check.h"#include "mac.h"
#ifdef CONFIG_PPC_PMAC#include <asm/machdep.h>extern void note_bootable_part(dev_t dev, int part, int goodness);#endif
/* * Code to understand MacOS partition tables. */
#ifdef CONFIG_PPC_PMACstatic inline void mac_fix_string(char *stg, int len){ int i;
for (i = len - 1; i >= 0 && stg[i] == ' '; i--) stg[i] = 0;}#endif
int mac_partition(struct parsed_partitions *state){ Sector sect; unsigned char *data; int slot, blocks_in_map; unsigned secsize, datasize, partoffset;#ifdef CONFIG_PPC_PMAC int found_root = 0; int found_root_goodness = 0;#endif struct mac_partition *part; struct mac_driver_desc *md;
/* Get 0th block and look at the first partition map entry. */ md = read_part_sector(state, 0, §); if (!md) return -1; if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) { put_dev_sector(sect); return 0; } secsize = be16_to_cpu(md->block_size); put_dev_sector(sect);
/* * If the "block size" is not a power of 2, things get weird - we might * end up with a partition straddling a sector boundary, so we wouldn't * be able to read a partition entry with read_part_sector(). * Real block sizes are probably (?) powers of two, so just require * that. */ if (!is_power_of_2(secsize)) return -1; datasize = round_down(secsize, 512); data = read_part_sector(state, datasize / 512, §); if (!data) return -1; partoffset = secsize % 512; if (partoffset + sizeof(*part) > datasize) { put_dev_sector(sect); return -1; } part = (struct mac_partition *) (data + partoffset); if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) { put_dev_sector(sect); return 0; /* not a MacOS disk */ } blocks_in_map = be32_to_cpu(part->map_count); if (blocks_in_map < 0 || blocks_in_map >= DISK_MAX_PARTS) { put_dev_sector(sect); return 0; }
if (blocks_in_map >= state->limit) blocks_in_map = state->limit - 1;
seq_buf_puts(&state->pp_buf, " [mac]"); for (slot = 1; slot <= blocks_in_map; ++slot) { int pos = slot * secsize; put_dev_sector(sect); data = read_part_sector(state, pos/512, §); if (!data) return -1; part = (struct mac_partition *) (data + pos%512); if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) break; put_partition(state, slot, be32_to_cpu(part->start_block) * (secsize/512), be32_to_cpu(part->block_count) * (secsize/512));
if (!strncasecmp(part->type, "Linux_RAID", 10)) state->parts[slot].flags = ADDPART_FLAG_RAID;#ifdef CONFIG_PPC_PMAC /* * If this is the first bootable partition, tell the * setup code, in case it wants to make this the root. */ if (machine_is(powermac)) { int goodness = 0;
mac_fix_string(part->processor, 16); mac_fix_string(part->name, 32); mac_fix_string(part->type, 32); if ((be32_to_cpu(part->status) & MAC_STATUS_BOOTABLE) && strcasecmp(part->processor, "powerpc") == 0) goodness++;
if (strcasecmp(part->type, "Apple_UNIX_SVR2") == 0 || (strncasecmp(part->type, "Linux", 5) == 0 && strcasecmp(part->type, "Linux_swap") != 0)) { int i, l;
goodness++; l = strnlen(part->name, sizeof(part->name)); if (strncmp(part->name, "/", sizeof(part->name)) == 0) goodness++; for (i = 0; i <= l - 4; ++i) { if (strncasecmp(part->name + i, "root", 4) == 0) { goodness += 2; break; } } if (strncasecmp(part->name, "swap", 4) == 0) goodness--; }
if (goodness > found_root_goodness) { found_root = slot; found_root_goodness = goodness; } }#endif /* CONFIG_PPC_PMAC */ }#ifdef CONFIG_PPC_PMAC if (found_root_goodness) note_bootable_part(state->disk->part0->bd_dev, found_root, found_root_goodness);#endif
put_dev_sector(sect); seq_buf_puts(&state->pp_buf, "\n"); return 1;}