/*
* Write disk label back to device after modification.
*/
int
writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
{
daddr_t partoff = -1;
int error = EIO;
int offset;
struct disklabel *dlp;
struct buf *bp = NULL;
/* get a buffer and initialize it */
bp = geteblk((int)lp->d_secsize);
bp->b_dev = dev;
if (readdpmelabel(bp, strat, lp, &partoff, 1) == 0) {
bp->b_blkno = partoff;
offset = 0;
} else if (readdoslabel(bp, strat, lp, &partoff, 1) == 0) {
bp->b_blkno = DL_BLKTOSEC(lp, partoff + DOS_LABELSECTOR) *
DL_BLKSPERSEC(lp);
offset = DL_BLKOFFSET(lp, partoff + DOS_LABELSECTOR);
} else
goto done;
/* Read it in, slap the new label in, and write it back out */
bp->b_bcount = lp->d_secsize;
CLR(bp->b_flags, B_READ | B_WRITE | B_DONE);
SET(bp->b_flags, B_BUSY | B_READ | B_RAW);
(*strat)(bp);
if ((error = biowait(bp)) != 0)
goto done;
dlp = (struct disklabel *)(bp->b_data + offset);
*dlp = *lp;
CLR(bp->b_flags, B_READ | B_WRITE | B_DONE);
SET(bp->b_flags, B_BUSY | B_WRITE | B_RAW);
(*strat)(bp);
error = biowait(bp);
done:
if (bp) {
bp->b_flags |= B_INVAL;
brelse(bp);
}
disk_change = 1;
return (error);
}
int
readsgilabel(struct buf *bp, void (*strat)(struct buf *),
struct disklabel *lp, daddr_t *partoffp, int spoofonly)
{
struct sgilabel *dlp;
int i, *p, cs = 0;
daddr_t fsoffs, fsend;
int error, offset;
/* if successful, locate disk label within block and validate */
error = readdisksector(bp, strat, lp, 0);
if (error)
return (error);
fsoffs = DL_SECTOBLK(lp, DL_GETBSTART(lp));
fsend = DL_SECTOBLK(lp, DL_GETBEND(lp));
dlp = (struct sgilabel *)(bp->b_data + LABELOFFSET);
if (dlp->magic != htobe32(SGILABEL_MAGIC))
goto finished;
if (dlp->partitions[0].blocks == 0)
return (EINVAL);
fsoffs = (long long)dlp->partitions[0].first;
fsend = fsoffs + dlp->partitions[0].blocks;
/* Only came here to find the offset... */
if (partoffp) {
*partoffp = fsoffs;
goto finished;
}
p = (int *)dlp;
i = sizeof(struct sgilabel) / sizeof(int);
while (i--)
cs += *p++;
if (cs != 0)
return (EINVAL); /* sgilabel checksum error */
/* Spoof info from sgi label, in case there is no OpenBSD label. */
lp->d_npartitions = MAXPARTITIONS;
for (i = 0; i < 16; i++) {
int bsd = maptab[i].m;
int type = maptab[i].b;
if (spoofonly && type != FS_UNUSED && type != FS_OTHER)
continue;
DL_SETPOFFSET(&lp->d_partitions[bsd],
dlp->partitions[i].first);
DL_SETPSIZE(&lp->d_partitions[bsd],
dlp->partitions[i].blocks);
lp->d_partitions[bsd].p_fstype = type;
if (type == FS_BSDFFS) {
lp->d_partitions[bsd].p_fragblock =
DISKLABELV1_FFS_FRAGBLOCK(1024, 8);
lp->d_partitions[bsd].p_cpg = 16;
}
}
DL_SETBSTART(lp, DL_BLKTOSEC(lp, fsoffs));
DL_SETBEND(lp, DL_BLKTOSEC(lp, fsend));
lp->d_version = 1;
lp->d_flags = D_VENDOR;
lp->d_checksum = 0;
lp->d_checksum = dkcksum(lp);
finished:
/* record the OpenBSD partition's placement for the caller */
if (partoffp)
*partoffp = fsoffs;
else {
DL_SETBSTART(lp, DL_BLKTOSEC(lp, fsoffs));
DL_SETBEND(lp, DL_BLKTOSEC(lp, fsend));
}
/* don't read the on-disk label if we are in spoofed-only mode */
if (spoofonly)
return (0);
error = readdisksector(bp, strat, lp, DL_BLKTOSEC(lp, fsoffs +
LABELSECTOR));
if (error)
return (error);
offset = DL_BLKOFFSET(lp, fsoffs + LABELSECTOR) + LABELOFFSET;
/*
* Do OpenBSD disklabel validation/adjustment.
*
* N.B: No matter what the bits are on the disk, we now have the
* OpenBSD disklabel for this sgi disk. DO NOT proceed to
* readdoslabel(), iso_spooflabel(), etc.
*/
checkdisklabel(bp->b_data + offset, lp, fsoffs, fsend);
return (0);
}
