/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ /* * Copyright (c) 1982, 1986, 1988, 1993 * The Regents of the University of California. All rights reserved. * (c) UNIX System Laboratories, Inc. * All or some portions of this file are derived from material licensed * to the University of California by American Telephone and Telegraph * Co. or Unix System Laboratories, Inc. and are reproduced herein with * the permission of UNIX System Laboratories, Inc. * * 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. * * @(#)ufs_disksubr.c 8.5 (Berkeley) 1/21/94 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/buf.h> #include <sys/disklabel.h> #include <sys/syslog.h> /* * Seek sort for disks. We depend on the driver which calls us using b_resid * as the current cylinder number. * * The argument ap structure holds a b_actf activity chain pointer on which we * keep two queues, sorted in ascending cylinder order. The first queue holds * those requests which are positioned after the current cylinder (in the first * request); the second holds requests which came in after their cylinder number * was passed. Thus we implement a one way scan, retracting after reaching the * end of the drive to the first request on the second queue, at which time it * becomes the first queue. * * A one-way scan is natural because of the way UNIX read-ahead blocks are * allocated. */ /* * For portability with historic industry practice, the * cylinder number has to be maintained in the `b_resid' * field. */ #define b_cylinder b_resid void disksort(ap, bp) register struct buf *ap, *bp; { register struct buf *bq; /* If the queue is empty, then it's easy. */ if (ap->b_actf == NULL) { bp->b_actf = NULL; ap->b_actf = bp; return; } /* * If we lie after the first (currently active) request, then we * must locate the second request list and add ourselves to it. */ bq = ap->b_actf; if (bp->b_cylinder < bq->b_cylinder) { while (bq->b_actf) { /* * Check for an ``inversion'' in the normally ascending * cylinder numbers, indicating the start of the second * request list. */ if (bq->b_actf->b_cylinder < bq->b_cylinder) { /* * Search the second request list for the first * request at a larger cylinder number. We go * before that; if there is no such request, we * go at end. */ do { if (bp->b_cylinder < bq->b_actf->b_cylinder) goto insert; if (bp->b_cylinder == bq->b_actf->b_cylinder && bp->b_blkno < bq->b_actf->b_blkno) goto insert; bq = bq->b_actf; } while (bq->b_actf); goto insert; /* after last */ } bq = bq->b_actf; } /* * No inversions... we will go after the last, and * be the first request in the second request list. */ goto insert; } /* * Request is at/after the current request... * sort in the first request list. */ while (bq->b_actf) { /* * We want to go after the current request if there is an * inversion after it (i.e. it is the end of the first * request list), or if the next request is a larger cylinder * than our request. */ if (bq->b_actf->b_cylinder < bq->b_cylinder || bp->b_cylinder < bq->b_actf->b_cylinder || (bp->b_cylinder == bq->b_actf->b_cylinder && bp->b_blkno < bq->b_actf->b_blkno)) goto insert; bq = bq->b_actf; } /* * Neither a second list nor a larger request... we go at the end of * the first list, which is the same as the end of the whole schebang. */ insert: bp->b_actf = bq->b_actf; bq->b_actf = bp; } /* 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)) /* * 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), part = dkpart(bp->b_dev); register void (*pr) __P((const char *, ...)); char partname = 'a' + part; int sn; if (pri != LOG_PRINTF) { log(pri, ""); pr = addlog; } else pr = printf; (*pr)("%s%d%c: %s %sing fsbn ", dname, unit, 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; (*pr)(" (%s%d bn %d; cn %d", dname, unit, sn, sn / lp->d_secpercyl); sn %= lp->d_secpercyl; (*pr)(" tn %d sn %d)", sn / lp->d_nsectors, sn % lp->d_nsectors); } }