diff options
Diffstat (limited to 'fs/partitions/sgi.c')
| -rw-r--r-- | fs/partitions/sgi.c | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/fs/partitions/sgi.c b/fs/partitions/sgi.c new file mode 100644 index 00000000000..6fa4ff89510 --- /dev/null +++ b/fs/partitions/sgi.c @@ -0,0 +1,82 @@ +/* + * fs/partitions/sgi.c + * + * Code extracted from drivers/block/genhd.c + */ + +#include "check.h" +#include "sgi.h" + +struct sgi_disklabel { + __be32 magic_mushroom; /* Big fat spliff... */ + __be16 root_part_num; /* Root partition number */ + __be16 swap_part_num; /* Swap partition number */ + s8 boot_file[16]; /* Name of boot file for ARCS */ + u8 _unused0[48]; /* Device parameter useless crapola.. */ + struct sgi_volume { + s8 name[8]; /* Name of volume */ + __be32 block_num; /* Logical block number */ + __be32 num_bytes; /* How big, in bytes */ + } volume[15]; + struct sgi_partition { + __be32 num_blocks; /* Size in logical blocks */ + __be32 first_block; /* First logical block */ + __be32 type; /* Type of this partition */ + } partitions[16]; + __be32 csum; /* Disk label checksum */ + __be32 _unused1; /* Padding */ +}; + +int sgi_partition(struct parsed_partitions *state, struct block_device *bdev) +{ + int i, csum; + __be32 magic; + int slot = 1; + unsigned int start, blocks; + __be32 *ui, cs; + Sector sect; + struct sgi_disklabel *label; + struct sgi_partition *p; + char b[BDEVNAME_SIZE]; + + label = (struct sgi_disklabel *) read_dev_sector(bdev, 0, §); + if (!label) + return -1; + p = &label->partitions[0]; + magic = label->magic_mushroom; + if(be32_to_cpu(magic) != SGI_LABEL_MAGIC) { + /*printk("Dev %s SGI disklabel: bad magic %08x\n", + bdevname(bdev, b), be32_to_cpu(magic));*/ + put_dev_sector(sect); + return 0; + } + ui = ((__be32 *) (label + 1)) - 1; + for(csum = 0; ui >= ((__be32 *) label);) { + cs = *ui--; + csum += be32_to_cpu(cs); + } + if(csum) { + printk(KERN_WARNING "Dev %s SGI disklabel: csum bad, label corrupted\n", + bdevname(bdev, b)); + put_dev_sector(sect); + return 0; + } + /* All SGI disk labels have 16 partitions, disks under Linux only + * have 15 minor's. Luckily there are always a few zero length + * partitions which we don't care about so we never overflow the + * current_minor. + */ + for(i = 0; i < 16; i++, p++) { + blocks = be32_to_cpu(p->num_blocks); + start = be32_to_cpu(p->first_block); + if (blocks) { + put_partition(state, slot, start, blocks); + if (be32_to_cpu(p->type) == LINUX_RAID_PARTITION) + state->parts[slot].flags = 1; + } + slot++; + } + printk("\n"); + put_dev_sector(sect); + return 1; +} |