5d210d3fd4
disksort is called at non-interrupt time and can be actively traversing the list when that happens, there is a very small window of vulnerability. Close it by protecting disksort with splbio().
660 lines
19 KiB
C
660 lines
19 KiB
C
#define PRE_DISKSLICE_COMPAT
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#ifndef PRE_DISKSLICE_COMPAT
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#define correct_readdisklabel readdisklabel
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#define correct_writedisklabel writedisklabel
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#endif
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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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* $Id: ufs_disksubr.c,v 1.15 1995/05/30 08:15:33 rgrimes Exp $
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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/diskslice.h>
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#include <sys/dkbad.h>
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#include <sys/syslog.h>
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/*
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* Seek sort for disks.
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*
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* The argument ap structure holds a b_actf activity chain pointer on which we
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* keep two queues, sorted in ascending block order. The first queue holds
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* those requests which are positioned after the current block (in the first
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* request); the second holds requests which came in after their block number
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* was passed. Thus we implement a one way scan, retracting after reaching the
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* end of the drive to the first request on the second queue, at which time it
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* becomes the first queue.
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*
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* A one-way scan is natural because of the way UNIX read-ahead blocks are
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* allocated.
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*/
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/*
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* For portability with historic industry practice, the
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* cylinder number has to be maintained in the `b_resid'
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* field.
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*/
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#define b_cylinder b_resid
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void
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disksort(ap, bp)
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register struct buf *ap, *bp;
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{
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register struct buf *bq;
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int s;
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s = splbio();
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/* If the queue is empty, then it's easy. */
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if (ap->b_actf == NULL) {
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bp->b_actf = NULL;
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ap->b_actf = bp;
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splx(s);
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return;
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}
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/*
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* If we lie after the first (currently active) request, then we
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* must locate the second request list and add ourselves to it.
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*/
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bq = ap->b_actf;
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if (bp->b_pblkno < bq->b_pblkno) {
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while (bq->b_actf) {
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/*
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* Check for an ``inversion'' in the normally ascending
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* cylinder numbers, indicating the start of the second
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* request list.
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*/
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if (bq->b_actf->b_pblkno < bq->b_pblkno) {
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/*
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* Search the second request list for the first
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* request at a larger cylinder number. We go
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* before that; if there is no such request, we
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* go at end.
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*/
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do {
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if (bp->b_pblkno < bq->b_actf->b_pblkno)
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goto insert;
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bq = bq->b_actf;
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} while (bq->b_actf);
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goto insert; /* after last */
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}
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bq = bq->b_actf;
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}
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/*
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* No inversions... we will go after the last, and
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* be the first request in the second request list.
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*/
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goto insert;
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}
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/*
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* Request is at/after the current request...
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* sort in the first request list.
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*/
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while (bq->b_actf) {
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/*
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* We want to go after the current request if there is an
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* inversion after it (i.e. it is the end of the first
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* request list), or if the next request is a larger cylinder
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* than our request.
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*/
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if (bq->b_actf->b_pblkno < bq->b_pblkno ||
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bp->b_pblkno < bq->b_actf->b_pblkno)
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goto insert;
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bq = bq->b_actf;
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}
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/*
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* Neither a second list nor a larger request... we go at the end of
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* the first list, which is the same as the end of the whole schebang.
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*/
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insert:
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bp->b_actf = bq->b_actf;
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bq->b_actf = bp;
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splx(s);
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}
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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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correct_readdisklabel(dev, strat, lp)
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dev_t dev;
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d_strategy_t *strat;
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register struct disklabel *lp;
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{
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register struct buf *bp;
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struct disklabel *dlp;
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char *msg = NULL;
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#if 0
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/*
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* This clobbers valid labels built by drivers. It should fail,
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* except on ancient systems, because it sets lp->d_npartitions
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* to 1 but the label is supposed to be read from the raw partition,
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* which is 0 only on ancient systems. Apparently most drivers
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* don't check lp->d_npartitions.
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*/
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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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#endif
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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_BUSY | 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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bp->b_flags = B_INVAL | B_AGE;
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brelse(bp);
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return (msg);
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}
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#ifdef PRE_DISKSLICE_COMPAT
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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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* If Machine Specific Partitions (MSP) are not found, then it will proceed
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* as if the BSD partition starts at 0
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* The MBR on an IBM PC is an example of an MSP.
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*/
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char *
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readdisklabel(dev, strat, lp, dp, bdp)
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dev_t dev;
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void (*strat)();
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register struct disklabel *lp;
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struct dos_partition *dp;
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struct dkbad *bdp;
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{
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register struct buf *bp;
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struct disklabel *dlp;
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char *msgMSP = NULL;
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char *msg = NULL;
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int i;
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int cyl = 0;
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/*
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* Set up the disklabel as in case there is no MSP.
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* We set the BSD part, but don't need to set the
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* RAW part, because readMSPtolabel() will reset that
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* itself. On return however, if there was no MSP,
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* then we will be looking into OUR part to find the label
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* and we will want that to start at 0, and have at least SOME length.
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*/
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if (lp->d_secperunit == 0)
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lp->d_secperunit = 0x1fffffff;
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lp->d_npartitions = OURPART + 1;
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if (lp->d_partitions[OURPART].p_size == 0)
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lp->d_partitions[OURPART].p_size = 0x100; /*enough for a label*/
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lp->d_partitions[OURPART].p_offset = 0;
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/*
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* Dig out the Dos MSP.. If we get it, all remaining transfers
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* will be relative to the base of the BSD part.
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*/
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msgMSP = readMSPtolabel(dev, strat, lp, dp, &cyl );
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/*
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* next, dig out disk label, relative to either the base of the
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* BSD part, or block 0, depending on if an MSP was found.
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*/
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bp = geteblk((int)lp->d_secsize);
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bp->b_blkno = LABELSECTOR;
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bp->b_dev = makedev(major(dev), dkminor(dkunit(dev), OURPART));
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bp->b_bcount = lp->d_secsize;
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bp->b_flags = B_BUSY | B_READ;
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bp->b_cylinder = cyl;
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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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if (msg && msgMSP) {
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msg = msgMSP;
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goto done;
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}
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/*
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* Since we had one of the two labels, either one made up from the
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* MSP, one found in the FreeBSD-MSP-partitions sector 2, or even
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* one in sector 2 absolute on the disk, there is not really an error.
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*/
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msg = NULL;
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/* obtain bad sector table if requested and present */
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if (bdp && (lp->d_flags & D_BADSECT)) {
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struct dkbad *db;
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printf("d_secsize: %ld\n", lp->d_secsize);
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i = 0;
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do {
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/* read a bad sector table */
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bp->b_flags = B_BUSY | B_READ;
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bp->b_blkno = lp->d_secperunit - lp->d_nsectors + i;
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if (lp->d_secsize > DEV_BSIZE)
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bp->b_blkno *= lp->d_secsize / DEV_BSIZE;
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else
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bp->b_blkno /= DEV_BSIZE / lp->d_secsize;
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bp->b_bcount = lp->d_secsize;
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bp->b_cylinder = lp->d_ncylinders - 1;
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(*strat)(bp);
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/* if successful, validate, otherwise try another */
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if (biowait(bp)) {
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msg = "bad sector table I/O error";
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} else {
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db = (struct dkbad *)(bp->b_un.b_addr);
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#define DKBAD_MAGIC 0x4321
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if (db->bt_mbz == 0
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&& db->bt_flag == DKBAD_MAGIC) {
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msg = NULL;
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*bdp = *db;
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break;
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} else
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msg = "bad sector table corrupted";
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}
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} while ((bp->b_flags & B_ERROR) && (i += 2) < 10 &&
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i < lp->d_nsectors);
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}
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done:
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bp->b_flags = B_INVAL | B_AGE;
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brelse(bp);
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return (msg);
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}
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#endif /* PRE_DISKSLICE_COMPAT */
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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)
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register struct disklabel *olp, *nlp;
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u_long openmask;
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{
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register i;
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register struct partition *opp, *npp;
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/*
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* Check it is actually a disklabel we are looking at.
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*/
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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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/*
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* For each partition that we think is open,
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*/
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while ((i = ffs((long)openmask)) != 0) {
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i--;
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/*
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* Check it is not changing....
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*/
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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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* (If we are using it then we had better stay the same type)
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* This is possibly dubious, as someone else noted (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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correct_writedisklabel(dev, strat, lp)
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dev_t dev;
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d_strategy_t *strat;
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register struct disklabel *lp;
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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 = dkpart(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 = dkmodpart(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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error = biowait(bp);
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if (error)
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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_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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#ifdef PRE_DISKSLICE_COMPAT
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/*
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* Write disk label back to device after modification.
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|
* For FreeBSD 2.0(x86) this routine will refuse to install a label if
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* there is no DOS MSP. (this can be changed)
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*
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* Assumptions for THIS VERSION:
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* The given disklabel pointer is actually that which is controlling this
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* Device, so that by fiddling it, readMSPtolabel() can ensure that
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* it can read from the MSP if it exists,
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* This assumption will cease as soon as ther is a better way of ensuring
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* that a read is done to the whole raw device.
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* MSP defines a BSD part, label is in block 1 (2nd block) of this
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*/
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int
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writedisklabel(dev, strat, lp)
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dev_t dev;
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void (*strat)();
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register struct disklabel *lp;
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{
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struct buf *bp = NULL;
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struct disklabel *dlp;
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int error = 0;
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struct disklabel label;
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char *msg;
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int BSDstart,BSDlen;
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int cyl; /* dummy arg for readMSPtolabel() */
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/*
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* Save the label (better be the real one)
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* because we are going to play funny games with the disklabel
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* controlling this device..
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*/
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bcopy(lp,&label,sizeof(label));
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|
/*
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|
* Unlike the read, we will trust the parameters given to us
|
|
* about the disk, in the new disklabel but will simply
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|
* force OURPART to start at block 0 as a default in case there is NO
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* MSP.
|
|
* readMSPtolabel() will reset it to start at the start of the BSD
|
|
* part if it exists
|
|
* At this time this is an error contition but I've left support for it
|
|
*/
|
|
lp->d_npartitions = OURPART + 1;
|
|
if (lp->d_partitions[OURPART].p_size == 0)
|
|
lp->d_partitions[OURPART].p_size = 0x1fffffff;
|
|
lp->d_partitions[OURPART].p_offset = 0;
|
|
|
|
msg = readMSPtolabel(dev, strat, lp, 0, &cyl );
|
|
/*
|
|
* If we want to be able to install without an Machine Specific
|
|
* Partitioning , then
|
|
* the failure of readMSPtolabel() should be made non fatal.
|
|
*/
|
|
if(msg) {
|
|
printf("writedisklabel:%s\n",msg);
|
|
error = ENXIO;
|
|
goto done;
|
|
}
|
|
/*
|
|
* If we had MSP (no message) but there
|
|
* was no BSD part in it
|
|
* then balk.. they should use fdisk to make one first or smash it..
|
|
* This may just be me being paranoid, but it's my choice for now..
|
|
* note we test for !msg, because the test above might be changed
|
|
* as a valid option..
|
|
*/
|
|
if((!msg) && (!(lp->d_subtype & DSTYPE_INDOSPART))) {
|
|
printf("writedisklabel: MSP with no BSD part\n");
|
|
}
|
|
|
|
/*
|
|
* get all the other bits back from the good new disklabel
|
|
* (the user wouldn't try confuse us would he?)
|
|
* With the exception of the OURPART which now points to the
|
|
* BSD partition.
|
|
*/
|
|
BSDstart = lp->d_partitions[OURPART].p_offset;
|
|
BSDlen = lp->d_partitions[OURPART].p_size;
|
|
bcopy(&label,lp,sizeof(label));
|
|
lp->d_partitions[OURPART].p_offset = BSDstart;
|
|
lp->d_partitions[OURPART].p_size = BSDlen;
|
|
|
|
bp = geteblk((int)lp->d_secsize);
|
|
bp->b_dev = makedev(major(dev), dkminor(dkunit(dev), OURPART));
|
|
bp->b_blkno = LABELSECTOR;
|
|
bp->b_bcount = lp->d_secsize;
|
|
#ifdef STUPID
|
|
/*
|
|
* We read the label first to see if it's there,
|
|
* in which case we will put ours at the same offset into the block..
|
|
* (I think this is stupid [Julian])
|
|
* Note that you can't write a label out over a corrupted label!
|
|
* (also stupid.. how do you write the first one? by raw writes?)
|
|
*/
|
|
bp->b_flags = B_READ;
|
|
(*strat)(bp);
|
|
error = biowait(bp);
|
|
if (error)
|
|
goto done;
|
|
for (dlp = (struct disklabel *)bp->b_data;
|
|
dlp <= (struct disklabel *)
|
|
((char *)bp->b_data + lp->d_secsize - sizeof(*dlp));
|
|
dlp = (struct disklabel *)((char *)dlp + sizeof(long))) {
|
|
if (dlp->d_magic == DISKMAGIC && dlp->d_magic2 == DISKMAGIC &&
|
|
dkcksum(dlp) == 0) {
|
|
bcopy(&label,dlp,sizeof(label));
|
|
bp->b_flags = B_WRITE;
|
|
(*strat)(bp);
|
|
error = biowait(bp);
|
|
goto done;
|
|
}
|
|
}
|
|
error = ESRCH;
|
|
#else /* Stupid */
|
|
dlp = (struct disklabel *)bp->b_data;
|
|
bcopy(&label,dlp,sizeof(label));
|
|
bp->b_flags = B_WRITE;
|
|
(*strat)(bp);
|
|
error = biowait(bp);
|
|
#endif /* Stupid */
|
|
done:
|
|
bcopy(&label,lp,sizeof(label)); /* start using the new label again */
|
|
if(bp)
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
#endif /* PRE_DISKSLICE_COMPAT */
|
|
|
|
/*
|
|
* Compute checksum for disk label.
|
|
*/
|
|
u_int
|
|
dkcksum(lp)
|
|
register struct disklabel *lp;
|
|
{
|
|
register u_short *start, *end;
|
|
register u_short sum = 0;
|
|
|
|
start = (u_short *)lp;
|
|
end = (u_short *)&lp->d_partitions[lp->d_npartitions];
|
|
while (start < end)
|
|
sum ^= *start++;
|
|
return (sum);
|
|
}
|
|
|
|
/*
|
|
* Disk error is the preface to plaintive error messages
|
|
* about failing disk transfers. It prints messages of the form
|
|
|
|
hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
|
|
|
|
* if the offset of the error in the transfer and a disk label
|
|
* are both available. blkdone should be -1 if the position of the error
|
|
* is unknown; the disklabel pointer may be null from drivers that have not
|
|
* been converted to use them. The message is printed with printf
|
|
* if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
|
|
* The message should be completed (with at least a newline) with printf
|
|
* or addlog, respectively. There is no trailing space.
|
|
*/
|
|
void
|
|
diskerr(bp, dname, what, pri, blkdone, lp)
|
|
register struct buf *bp;
|
|
char *dname, *what;
|
|
int pri, blkdone;
|
|
register struct disklabel *lp;
|
|
{
|
|
int unit = dkunit(bp->b_dev);
|
|
int slice = dkslice(bp->b_dev);
|
|
int part = dkpart(bp->b_dev);
|
|
register void (*pr) __P((const char *, ...));
|
|
char partname[2];
|
|
char *sname;
|
|
int sn;
|
|
|
|
if (pri != LOG_PRINTF) {
|
|
log(pri, "");
|
|
pr = addlog;
|
|
} else
|
|
pr = printf;
|
|
sname = dsname(dname, unit, slice, part, partname);
|
|
(*pr)("%s%s: %s %sing fsbn ", sname, partname, what,
|
|
bp->b_flags & B_READ ? "read" : "writ");
|
|
sn = bp->b_blkno;
|
|
if (bp->b_bcount <= DEV_BSIZE)
|
|
(*pr)("%d", sn);
|
|
else {
|
|
if (blkdone >= 0) {
|
|
sn += blkdone;
|
|
(*pr)("%d of ", sn);
|
|
}
|
|
(*pr)("%d-%d", bp->b_blkno,
|
|
bp->b_blkno + (bp->b_bcount - 1) / DEV_BSIZE);
|
|
}
|
|
if (lp && (blkdone >= 0 || bp->b_bcount <= lp->d_secsize)) {
|
|
#ifdef tahoe
|
|
sn *= DEV_BSIZE / lp->d_secsize; /* XXX */
|
|
#endif
|
|
sn += lp->d_partitions[part].p_offset;
|
|
/*
|
|
* XXX should add slice offset and not print the slice,
|
|
* but we don't know the slice pointer.
|
|
* XXX should print bp->b_pblkno so that this will work
|
|
* independent of slices, labels and bad sector remapping,
|
|
* but some drivers don't set bp->b_pblkno.
|
|
*/
|
|
(*pr)(" (%s bn %d; cn %d", sname, sn, sn / lp->d_secpercyl);
|
|
sn %= lp->d_secpercyl;
|
|
(*pr)(" tn %d sn %d)", sn / lp->d_nsectors, sn % lp->d_nsectors);
|
|
}
|
|
}
|