226 lines
7.4 KiB
C
226 lines
7.4 KiB
C
/*
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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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* from: @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94
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* $Id: subr_disk.c,v 1.11 1994/05/19 03:43:13 mycroft 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/syslog.h>
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/*
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* Seek sort for disks. We depend on the driver which calls us using b_resid
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* as the current cylinder number.
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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 cylinder order. The first queue holds
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* those requests which are positioned after the current cylinder (in the first
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* request); the second holds requests which came in after their cylinder 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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/* 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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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_cylinder < bq->b_cylinder) {
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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_cylinder < bq->b_cylinder) {
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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_cylinder <
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bq->b_actf->b_cylinder)
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goto insert;
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if (bp->b_cylinder ==
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bq->b_actf->b_cylinder &&
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bp->b_blkno < bq->b_actf->b_blkno)
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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_cylinder < bq->b_cylinder ||
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bp->b_cylinder < bq->b_actf->b_cylinder ||
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(bp->b_cylinder == bq->b_actf->b_cylinder &&
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bp->b_blkno < bq->b_actf->b_blkno))
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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: bp->b_actf = bq->b_actf;
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bq->b_actf = bp;
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}
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/* encoding of disk minor numbers, should be elsewhere... */
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#define dkunit(dev) (minor(dev) >> 3)
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#define dkpart(dev) (minor(dev) & 07)
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#define dkminor(unit, part) (((unit) << 3) | (part))
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/*
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* Compute checksum for disk label.
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*/
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u_int
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dkcksum(lp)
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register struct disklabel *lp;
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{
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register u_short *start, *end;
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register u_short sum = 0;
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start = (u_short *)lp;
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end = (u_short *)&lp->d_partitions[lp->d_npartitions];
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while (start < end)
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sum ^= *start++;
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return (sum);
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}
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/*
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* Disk error is the preface to plaintive error messages
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* about failing disk transfers. It prints messages of the form
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hp0g: hard error reading fsbn 12345 of 12344-12347 (hp0 bn %d cn %d tn %d sn %d)
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* if the offset of the error in the transfer and a disk label
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* are both available. blkdone should be -1 if the position of the error
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* is unknown; the disklabel pointer may be null from drivers that have not
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* been converted to use them. The message is printed with printf
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* if pri is LOG_PRINTF, otherwise it uses log at the specified priority.
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* The message should be completed (with at least a newline) with printf
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* or addlog, respectively. There is no trailing space.
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*/
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void
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diskerr(bp, dname, what, pri, blkdone, lp)
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register struct buf *bp;
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char *dname, *what;
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int pri, blkdone;
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register struct disklabel *lp;
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{
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int unit = dkunit(bp->b_dev), part = dkpart(bp->b_dev);
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register void (*pr) __P((const char *, ...));
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char partname = 'a' + part;
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int sn;
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if (pri != LOG_PRINTF) {
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log(pri, "");
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pr = addlog;
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} else
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pr = printf;
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(*pr)("%s%d%c: %s %sing fsbn ", dname, unit, partname, what,
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bp->b_flags & B_READ ? "read" : "writ");
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sn = bp->b_blkno;
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if (bp->b_bcount <= DEV_BSIZE)
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(*pr)("%d", sn);
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else {
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if (blkdone >= 0) {
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sn += blkdone;
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(*pr)("%d of ", sn);
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}
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(*pr)("%d-%d", bp->b_blkno,
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bp->b_blkno + (bp->b_bcount - 1) / DEV_BSIZE);
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}
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if (lp && (blkdone >= 0 || bp->b_bcount <= lp->d_secsize)) {
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#ifdef tahoe
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sn *= DEV_BSIZE / lp->d_secsize; /* XXX */
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#endif
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sn += lp->d_partitions[part].p_offset;
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(*pr)(" (%s%d bn %d; cn %d", dname, unit, sn,
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sn / lp->d_secpercyl);
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sn %= lp->d_secpercyl;
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(*pr)(" tn %d sn %d)", sn / lp->d_nsectors, sn % lp->d_nsectors);
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}
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}
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