From 7b7ccf8500ccb9c6507b20d69f8dc26dc07ca3b6 Mon Sep 17 00:00:00 2001 From: deraadt Date: Sat, 15 Jan 1994 02:04:56 +0000 Subject: [PATCH] new; pretty much straight from net/2 --- sys/arch/pmax/pmax/disksubr.c | 196 ++++++++++++++++++++++++++++++++++ 1 file changed, 196 insertions(+) create mode 100644 sys/arch/pmax/pmax/disksubr.c diff --git a/sys/arch/pmax/pmax/disksubr.c b/sys/arch/pmax/pmax/disksubr.c new file mode 100644 index 000000000000..cfd7808c051e --- /dev/null +++ b/sys/arch/pmax/pmax/disksubr.c @@ -0,0 +1,196 @@ +/* + * Copyright (c) 1982, 1986, 1988 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 + * $Id: disksubr.c,v 1.1 1994/01/15 02:04:56 deraadt Exp $ + */ + +#include +#include +#include +#include +#include + +/* XXX encoding of disk minor numbers, should be elsewhere... */ +#define dkunit(dev) (minor(dev) >> 3) +#define dkpart(dev) (minor(dev) & 7) +#define dkminor(unit, part) (((unit) << 3) | (part)) + +#define b_cylin b_resid + +/* + * Attempt to read a disk label from a device + * using the indicated stategy routine. + * The label must be partly set up before this: + * secpercyl and anything required in the strategy routine + * (e.g., sector size) must be filled in before calling us. + * Returns null on success and an error string on failure. + */ +char * +readdisklabel(dev, strat, lp, osdep) + dev_t dev; + void (*strat)(); + register struct disklabel *lp; + struct cpu_disklabel *osdep; +{ + register struct buf *bp; + struct disklabel *dlp; + char *msg = NULL; + + if (lp->d_secperunit == 0) + lp->d_secperunit = 0x1fffffff; + lp->d_npartitions = 1; + if (lp->d_partitions[0].p_size == 0) + lp->d_partitions[0].p_size = 0x1fffffff; + lp->d_partitions[0].p_offset = 0; + + bp = geteblk((int)lp->d_secsize); + bp->b_dev = dev; + bp->b_blkno = LABELSECTOR; + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_BUSY | B_READ; + bp->b_cylin = LABELSECTOR / lp->d_secpercyl; + (*strat)(bp); + if (biowait(bp)) { + msg = "I/O error"; + } else for (dlp = (struct disklabel *)bp->b_un.b_addr; + dlp <= (struct disklabel *)(bp->b_un.b_addr+DEV_BSIZE-sizeof(*dlp)); + dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { + if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { + if (msg == NULL) + msg = "no disk label"; + } else if (dlp->d_npartitions > MAXPARTITIONS || + dkcksum(dlp) != 0) + msg = "disk label corrupted"; + else { + *lp = *dlp; + msg = NULL; + break; + } + } + bp->b_flags = B_INVAL | B_AGE; + brelse(bp); + return (msg); +} + +/* + * Check new disk label for sensibility + * before setting it. + */ +setdisklabel(olp, nlp, openmask, osdep) + register struct disklabel *olp, *nlp; + u_long openmask; + struct cpu_disklabel *osdep; +{ + register i; + register struct partition *opp, *npp; + + if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || + dkcksum(nlp) != 0) + return (EINVAL); + while ((i = ffs((long)openmask)) != 0) { + i--; + openmask &= ~(1 << i); + if (nlp->d_npartitions <= i) + return (EBUSY); + opp = &olp->d_partitions[i]; + npp = &nlp->d_partitions[i]; + if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size) + return (EBUSY); + /* + * Copy internally-set partition information + * if new label doesn't include it. XXX + */ + if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) { + npp->p_fstype = opp->p_fstype; + npp->p_fsize = opp->p_fsize; + npp->p_frag = opp->p_frag; + npp->p_cpg = opp->p_cpg; + } + } + nlp->d_checksum = 0; + nlp->d_checksum = dkcksum(nlp); + *olp = *nlp; + return (0); +} + +/* encoding of disk minor numbers, should be elsewhere... */ +#define dkunit(dev) (minor(dev) >> 3) +#define dkpart(dev) (minor(dev) & 07) +#define dkminor(unit, part) (((unit) << 3) | (part)) + +/* + * Write disk label back to device after modification. + */ +writedisklabel(dev, strat, lp, osdep) + dev_t dev; + void (*strat)(); + register struct disklabel *lp; + struct cpu_disklabel *osdep; +{ + struct buf *bp; + struct disklabel *dlp; + int labelpart; + int error = 0; + + labelpart = dkpart(dev); + if (lp->d_partitions[labelpart].p_offset != 0) { + if (lp->d_partitions[0].p_offset != 0) + return (EXDEV); /* not quite right */ + labelpart = 0; + } + bp = geteblk((int)lp->d_secsize); + bp->b_dev = makedev(major(dev), dkminor(dkunit(dev), labelpart)); + bp->b_blkno = LABELSECTOR; + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_READ; + (*strat)(bp); + if (error = biowait(bp)) + goto done; + for (dlp = (struct disklabel *)bp->b_un.b_addr; + dlp <= (struct disklabel *) + (bp->b_un.b_addr + lp->d_secsize - sizeof(*dlp)); + dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { + if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC && + dkcksum(dlp) == 0) { + *dlp = *lp; + bp->b_flags = B_WRITE; + (*strat)(bp); + error = biowait(bp); + goto done; + } + } + error = ESRCH; +done: + brelse(bp); + return (error); +}