242 lines
7.1 KiB
C
242 lines
7.1 KiB
C
/* $NetBSD: disksubr.c,v 1.10 2000/11/20 08:24:14 chs Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/disklabel.h>
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#include <sys/syslog.h>
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#define b_cylinder b_resid
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/*
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* Attempt to read a disk label from a device using the indicated stategy
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* routine. The label must be partly set up before this: secpercyl and
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* anything required in the strategy routine (e.g., sector size) must be
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* filled in before calling us. Returns null on success and an error
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* string on failure.
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*/
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char *
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readdisklabel(dev, strat, lp, osdep)
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dev_t dev;
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void (*strat) __P((struct buf *));
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struct disklabel *lp;
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struct cpu_disklabel *osdep;
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{
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struct buf *bp;
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struct disklabel *dlp;
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char *msg = NULL;
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if (lp->d_secperunit == 0)
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lp->d_secperunit = 0x1fffffff;
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lp->d_npartitions = 1;
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if (lp->d_partitions[0].p_size == 0)
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lp->d_partitions[0].p_size = 0x1fffffff;
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lp->d_partitions[0].p_offset = 0;
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = dev;
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bp->b_blkno = LABELSECTOR;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags |= B_READ;
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bp->b_cylinder = LABELSECTOR / lp->d_secpercyl;
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(*strat)(bp);
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if (biowait(bp))
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msg = "I/O error";
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else for (dlp = (struct disklabel *)bp->b_data;
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dlp <= (struct disklabel *)((char *)bp->b_data +
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DEV_BSIZE - sizeof(*dlp));
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dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
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if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) {
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if (msg == NULL)
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msg = "no disk label";
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} else if (dlp->d_npartitions > MAXPARTITIONS ||
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dkcksum(dlp) != 0)
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msg = "disk label corrupted";
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else {
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*lp = *dlp;
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msg = NULL;
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break;
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}
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}
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brelse(bp);
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return (msg);
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}
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/*
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* Check new disk label for sensibility before setting it.
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*/
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int
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setdisklabel(olp, nlp, openmask, osdep)
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struct disklabel *olp, *nlp;
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u_long openmask;
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struct cpu_disklabel *osdep;
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{
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int i;
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struct partition *opp, *npp;
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if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC ||
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dkcksum(nlp) != 0)
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return (EINVAL);
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while ((i = ffs((long)openmask)) != 0) {
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i--;
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openmask &= ~(1 << i);
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if (nlp->d_npartitions <= i)
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return (EBUSY);
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opp = &olp->d_partitions[i];
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npp = &nlp->d_partitions[i];
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if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size)
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return (EBUSY);
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/*
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* Copy internally-set partition information
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* if new label doesn't include it. XXX
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*/
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if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) {
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npp->p_fstype = opp->p_fstype;
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npp->p_fsize = opp->p_fsize;
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npp->p_frag = opp->p_frag;
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npp->p_cpg = opp->p_cpg;
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}
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}
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nlp->d_checksum = 0;
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nlp->d_checksum = dkcksum(nlp);
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*olp = *nlp;
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return (0);
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}
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/*
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* Write disk label back to device after modification.
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*/
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int
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writedisklabel(dev, strat, lp, osdep)
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dev_t dev;
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void (*strat) __P((struct buf *));
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struct disklabel *lp;
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struct cpu_disklabel *osdep;
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{
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struct buf *bp;
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struct disklabel *dlp;
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int labelpart;
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int error = 0;
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labelpart = DISKPART(dev);
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if (lp->d_partitions[labelpart].p_offset != 0) {
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if (lp->d_partitions[0].p_offset != 0)
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return (EXDEV); /* not quite right */
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labelpart = 0;
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}
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bp = geteblk((int)lp->d_secsize);
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bp->b_dev = MAKEDISKDEV(major(dev), DISKUNIT(dev), labelpart);
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bp->b_blkno = LABELSECTOR;
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bp->b_bcount = lp->d_secsize;
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bp->b_flags |= B_READ;
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(*strat)(bp);
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if ((error = biowait(bp)))
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goto done;
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for (dlp = (struct disklabel *)bp->b_data;
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dlp <= (struct disklabel *)
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((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
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dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
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if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
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dkcksum(dlp) == 0) {
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*dlp = *lp;
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bp->b_flags &= ~(B_READ|B_DONE);
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bp->b_flags |= B_WRITE;
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(*strat)(bp);
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error = biowait(bp);
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goto done;
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}
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}
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error = ESRCH;
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done:
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brelse(bp);
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return (error);
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}
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/*
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* Determine the size of the transfer, and make sure it is
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* within the boundaries of the partition. Adjust transfer
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* if needed, and signal errors or early completion.
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*/
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int
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bounds_check_with_label(bp, lp, wlabel)
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struct buf *bp;
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struct disklabel *lp;
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int wlabel;
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{
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struct partition *p = &lp->d_partitions[DISKPART(bp->b_dev)];
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int labelsect = lp->d_partitions[0].p_offset;
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int maxsz = p->p_size;
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int sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT;
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/* Overwriting disk label? */
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if (bp->b_blkno + p->p_offset <= LABELSECTOR + labelsect &&
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(bp->b_flags & B_READ) == 0 && !wlabel) {
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bp->b_error = EROFS;
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goto bad;
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}
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/* beyond partition? */
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if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) {
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if (bp->b_blkno == maxsz) {
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/* If exactly at end of disk, return EOF. */
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bp->b_resid = bp->b_bcount;
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return (0);
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}
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/* ...or truncate if part of it fits */
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sz = maxsz - bp->b_blkno;
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if (sz <= 0) {
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bp->b_error = EINVAL;
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goto bad;
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}
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bp->b_bcount = sz << DEV_BSHIFT;
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}
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/* calculate cylinder for disksort to order transfers with */
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bp->b_resid = (bp->b_blkno + p->p_offset) / lp->d_secpercyl;
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return (1);
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bad:
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bp->b_flags |= B_ERROR;
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return (-1);
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}
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