From 655945f7bfb1b36532d9ec23070ba6a8b904ae8e Mon Sep 17 00:00:00 2001 From: Davidlohr Bueso Date: Thu, 7 Oct 2010 10:48:16 -0400 Subject: partx: add mac partition table support Signed-off-by: Davidlohr Bueso --- partx/mac.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 partx/mac.c (limited to 'partx') diff --git a/partx/mac.c b/partx/mac.c new file mode 100644 index 00000000..ed4ed9b9 --- /dev/null +++ b/partx/mac.c @@ -0,0 +1,74 @@ +/* + * Lifted from kpartx's mac.c + * + * Integrated to partx (utils-linux-ng) + * Davidlohr Bueso + */ + +#include +#include +#include + +#include "bitops.h" +#include "partx.h" + +#define MAC_PARTITION_MAGIC 0x504d +#define MAC_DRIVER_MAGIC 0x4552 + +struct mac_partition { + uint16_t signature; /* expected to be MAC_PARTITION_MAGIC */ + uint16_t res1; + uint32_t map_count; /* # blocks in partition map */ + uint32_t start_block; /* absolute starting block # of partition */ + uint32_t block_count; /* number of blocks in partition */ + /* there is more stuff after this that we don't need */ +}; + +/* Driver descriptor structure, in block 0 */ +struct mac_driver_desc { + uint16_t signature; /* expected to be MAC_DRIVER_MAGIC */ + uint16_t block_size; + uint32_t block_count; +}; + +int +read_mac_pt(int fd, struct slice all, struct slice *sp, int ns) { + struct mac_driver_desc *md; + struct mac_partition *part; + unsigned secsize; + char *data; + int blk, blocks_in_map; + int n = 0; + + md = (struct mac_driver_desc *) getblock(fd, 0); + if (md == NULL) + return -1; + + if (be16_to_cpu(md->signature) != MAC_DRIVER_MAGIC) + return -1; + + secsize = be16_to_cpu(md->block_size); + data = getblock(fd, secsize/512); + if (!data) + return -1; + part = (struct mac_partition *) (data + secsize%512); + + if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) + return -1; + + blocks_in_map = be32_to_cpu(part->map_count); + for (blk = 1; blk <= blocks_in_map && blk <= ns; ++blk, ++n) { + int pos = blk * secsize; + data = getblock(fd, pos/512); + if (!data) + return -1; + + part = (struct mac_partition *) (data + pos%512); + if (be16_to_cpu(part->signature) != MAC_PARTITION_MAGIC) + break; + + sp[n].start = be32_to_cpu(part->start_block) * (secsize/512); + sp[n].size = be32_to_cpu(part->block_count) * (secsize/512); + } + return n; +} -- cgit v1.2.3