diff options
Diffstat (limited to 'block/partitions/sun.c')
| -rw-r--r-- | block/partitions/sun.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/block/partitions/sun.c b/block/partitions/sun.c new file mode 100644 index 000000000..90f36724e --- /dev/null +++ b/block/partitions/sun.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * fs/partitions/sun.c + * + * Code extracted from drivers/block/genhd.c + * + * Copyright (C) 1991-1998 Linus Torvalds + * Re-organised Feb 1998 Russell King + */ + +#include "check.h" +#include "sun.h" + +int sun_partition(struct parsed_partitions *state) +{ + int i; + __be16 csum; + int slot = 1; + __be16 *ush; + Sector sect; + struct sun_disklabel { + unsigned char info[128]; /* Informative text string */ + struct sun_vtoc { + __be32 version; /* Layout version */ + char volume[8]; /* Volume name */ + __be16 nparts; /* Number of partitions */ + struct sun_info { /* Partition hdrs, sec 2 */ + __be16 id; + __be16 flags; + } infos[8]; + __be16 padding; /* Alignment padding */ + __be32 bootinfo[3]; /* Info needed by mboot */ + __be32 sanity; /* To verify vtoc sanity */ + __be32 reserved[10]; /* Free space */ + __be32 timestamp[8]; /* Partition timestamp */ + } vtoc; + __be32 write_reinstruct; /* sectors to skip, writes */ + __be32 read_reinstruct; /* sectors to skip, reads */ + unsigned char spare[148]; /* Padding */ + __be16 rspeed; /* Disk rotational speed */ + __be16 pcylcount; /* Physical cylinder count */ + __be16 sparecyl; /* extra sects per cylinder */ + __be16 obs1; /* gap1 */ + __be16 obs2; /* gap2 */ + __be16 ilfact; /* Interleave factor */ + __be16 ncyl; /* Data cylinder count */ + __be16 nacyl; /* Alt. cylinder count */ + __be16 ntrks; /* Tracks per cylinder */ + __be16 nsect; /* Sectors per track */ + __be16 obs3; /* bhead - Label head offset */ + __be16 obs4; /* ppart - Physical Partition */ + struct sun_partition { + __be32 start_cylinder; + __be32 num_sectors; + } partitions[8]; + __be16 magic; /* Magic number */ + __be16 csum; /* Label xor'd checksum */ + } * label; + struct sun_partition *p; + unsigned long spc; + char b[BDEVNAME_SIZE]; + int use_vtoc; + int nparts; + + label = read_part_sector(state, 0, §); + if (!label) + return -1; + + p = label->partitions; + if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) { +/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n", + bdevname(bdev, b), be16_to_cpu(label->magic)); */ + put_dev_sector(sect); + return 0; + } + /* Look at the checksum */ + ush = ((__be16 *) (label+1)) - 1; + for (csum = 0; ush >= ((__be16 *) label);) + csum ^= *ush--; + if (csum) { + printk("Dev %s Sun disklabel: Csum bad, label corrupted\n", + bdevname(state->bdev, b)); + put_dev_sector(sect); + return 0; + } + + /* Check to see if we can use the VTOC table */ + use_vtoc = ((be32_to_cpu(label->vtoc.sanity) == SUN_VTOC_SANITY) && + (be32_to_cpu(label->vtoc.version) == 1) && + (be16_to_cpu(label->vtoc.nparts) <= 8)); + + /* Use 8 partition entries if not specified in validated VTOC */ + nparts = (use_vtoc) ? be16_to_cpu(label->vtoc.nparts) : 8; + + /* + * So that old Linux-Sun partitions continue to work, + * alow the VTOC to be used under the additional condition ... + */ + use_vtoc = use_vtoc || !(label->vtoc.sanity || + label->vtoc.version || label->vtoc.nparts); + spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect); + for (i = 0; i < nparts; i++, p++) { + unsigned long st_sector; + unsigned int num_sectors; + + st_sector = be32_to_cpu(p->start_cylinder) * spc; + num_sectors = be32_to_cpu(p->num_sectors); + if (num_sectors) { + put_partition(state, slot, st_sector, num_sectors); + state->parts[slot].flags = 0; + if (use_vtoc) { + if (be16_to_cpu(label->vtoc.infos[i].id) == LINUX_RAID_PARTITION) + state->parts[slot].flags |= ADDPART_FLAG_RAID; + else if (be16_to_cpu(label->vtoc.infos[i].id) == SUN_WHOLE_DISK) + state->parts[slot].flags |= ADDPART_FLAG_WHOLEDISK; + } + } + slot++; + } + strlcat(state->pp_buf, "\n", PAGE_SIZE); + put_dev_sector(sect); + return 1; +} |