mirror of https://gitee.com/openkylin/linux.git
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
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/*
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* fs/partitions/sun.c
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*
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* Code extracted from drivers/block/genhd.c
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*
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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 "check.h"
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#include "sun.h"
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int sun_partition(struct parsed_partitions *state, struct block_device *bdev)
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{
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int i;
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__be16 csum;
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int slot = 1;
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__be16 *ush;
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Sector sect;
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struct sun_disklabel {
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unsigned char info[128]; /* Informative text string */
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unsigned char spare0[14];
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struct sun_info {
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unsigned char spare1;
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unsigned char id;
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unsigned char spare2;
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unsigned char flags;
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} infos[8];
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unsigned char spare[246]; /* Boot information etc. */
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__be16 rspeed; /* Disk rotational speed */
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__be16 pcylcount; /* Physical cylinder count */
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__be16 sparecyl; /* extra sects per cylinder */
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unsigned char spare2[4]; /* More magic... */
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__be16 ilfact; /* Interleave factor */
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__be16 ncyl; /* Data cylinder count */
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__be16 nacyl; /* Alt. cylinder count */
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__be16 ntrks; /* Tracks per cylinder */
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__be16 nsect; /* Sectors per track */
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unsigned char spare3[4]; /* Even more magic... */
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struct sun_partition {
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__be32 start_cylinder;
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__be32 num_sectors;
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} partitions[8];
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__be16 magic; /* Magic number */
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__be16 csum; /* Label xor'd checksum */
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} * label;
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struct sun_partition *p;
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unsigned long spc;
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char b[BDEVNAME_SIZE];
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label = (struct sun_disklabel *)read_dev_sector(bdev, 0, §);
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if (!label)
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return -1;
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p = label->partitions;
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if (be16_to_cpu(label->magic) != SUN_LABEL_MAGIC) {
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/* printk(KERN_INFO "Dev %s Sun disklabel: bad magic %04x\n",
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bdevname(bdev, b), be16_to_cpu(label->magic)); */
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put_dev_sector(sect);
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return 0;
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}
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/* Look at the checksum */
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ush = ((__be16 *) (label+1)) - 1;
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for (csum = 0; ush >= ((__be16 *) label);)
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csum ^= *ush--;
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if (csum) {
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printk("Dev %s Sun disklabel: Csum bad, label corrupted\n",
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bdevname(bdev, b));
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put_dev_sector(sect);
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return 0;
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}
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/* All Sun disks have 8 partition entries */
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spc = be16_to_cpu(label->ntrks) * be16_to_cpu(label->nsect);
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for (i = 0; i < 8; i++, p++) {
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unsigned long st_sector;
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int num_sectors;
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st_sector = be32_to_cpu(p->start_cylinder) * spc;
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num_sectors = be32_to_cpu(p->num_sectors);
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if (num_sectors) {
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put_partition(state, slot, st_sector, num_sectors);
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if (label->infos[i].id == LINUX_RAID_PARTITION)
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state->parts[slot].flags = 1;
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}
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slot++;
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}
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printk("\n");
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put_dev_sector(sect);
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return 1;
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}
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