379 lines
10 KiB
C
379 lines
10 KiB
C
/* $NetBSD: subr_disk.c,v 1.82 2006/10/25 04:04:46 thorpej Exp $ */
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/*-
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* Copyright (c) 1996, 1997, 1999, 2000 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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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. 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/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: subr_disk.c,v 1.82 2006/10/25 04:04:46 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/buf.h>
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#include <sys/syslog.h>
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#include <sys/disklabel.h>
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#include <sys/disk.h>
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#include <sys/sysctl.h>
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#include <lib/libkern/libkern.h>
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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(struct disklabel *lp)
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{
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u_short *start, *end;
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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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#ifndef PRIdaddr
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#define PRIdaddr PRId64
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#endif
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void
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diskerr(const struct buf *bp, const char *dname, const char *what, int pri,
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int blkdone, const struct disklabel *lp)
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{
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int unit = DISKUNIT(bp->b_dev), part = DISKPART(bp->b_dev);
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void (*pr)(const char *, ...);
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char partname = 'a' + part;
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daddr_t sn;
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if (/*CONSTCOND*/0)
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/* Compiler will error this is the format is wrong... */
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printf("%" PRIdaddr, bp->b_blkno);
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if (pri != LOG_PRINTF) {
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static const char fmt[] = "";
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log(pri, fmt);
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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)("%" PRIdaddr, sn);
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else {
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if (blkdone >= 0) {
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sn += blkdone;
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(*pr)("%" PRIdaddr " of ", sn);
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}
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(*pr)("%" PRIdaddr "-%" PRIdaddr "", 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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sn += lp->d_partitions[part].p_offset;
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(*pr)(" (%s%d bn %" PRIdaddr "; cn %" PRIdaddr "",
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dname, unit, sn, sn / lp->d_secpercyl);
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sn %= lp->d_secpercyl;
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(*pr)(" tn %" PRIdaddr " sn %" PRIdaddr ")",
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sn / lp->d_nsectors, sn % lp->d_nsectors);
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}
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}
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/*
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* Searches the iostatlist for the disk corresponding to the
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* name provided.
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*/
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struct disk *
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disk_find(const char *name)
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{
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struct io_stats *stat;
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stat = iostat_find(name);
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if ((stat != NULL) && (stat->io_type == IOSTAT_DISK))
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return stat->io_parent;
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return (NULL);
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}
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static void
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disk_init0(struct disk *diskp)
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{
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/*
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* Initialize the wedge-related locks and other fields.
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*/
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lockinit(&diskp->dk_rawlock, PRIBIO, "dkrawlk", 0, 0);
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lockinit(&diskp->dk_openlock, PRIBIO, "dkoplk", 0, 0);
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LIST_INIT(&diskp->dk_wedges);
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diskp->dk_nwedges = 0;
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}
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static void
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disk_attach0(struct disk *diskp)
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{
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/*
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* Allocate and initialize the disklabel structures. Note that
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* it's not safe to sleep here, since we're probably going to be
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* called during autoconfiguration.
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*/
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diskp->dk_label = malloc(sizeof(struct disklabel), M_DEVBUF, M_NOWAIT);
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diskp->dk_cpulabel = malloc(sizeof(struct cpu_disklabel), M_DEVBUF,
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M_NOWAIT);
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if ((diskp->dk_label == NULL) || (diskp->dk_cpulabel == NULL))
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panic("disk_attach: can't allocate storage for disklabel");
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memset(diskp->dk_label, 0, sizeof(struct disklabel));
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memset(diskp->dk_cpulabel, 0, sizeof(struct cpu_disklabel));
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/*
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* Set up the stats collection.
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*/
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diskp->dk_stats = iostat_alloc(IOSTAT_DISK, diskp, diskp->dk_name);
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}
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static void
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disk_detach0(struct disk *diskp)
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{
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/*
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* Remove from the drivelist.
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*/
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iostat_free(diskp->dk_stats);
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/*
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* Release the disk-info dictionary.
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*/
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if (diskp->dk_info) {
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prop_object_release(diskp->dk_info);
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diskp->dk_info = NULL;
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}
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/*
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* Free the space used by the disklabel structures.
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*/
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free(diskp->dk_label, M_DEVBUF);
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free(diskp->dk_cpulabel, M_DEVBUF);
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}
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/*
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* Attach a disk.
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*/
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void
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disk_attach(struct disk *diskp)
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{
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disk_init0(diskp);
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disk_attach0(diskp);
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}
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/*
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* Detach a disk.
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*/
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void
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disk_detach(struct disk *diskp)
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{
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(void) lockmgr(&diskp->dk_openlock, LK_DRAIN, NULL);
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disk_detach0(diskp);
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}
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/*
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* Initialize a pseudo disk.
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*/
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void
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pseudo_disk_init(struct disk *diskp)
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{
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disk_init0(diskp);
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}
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/*
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* Attach a pseudo disk.
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*/
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void
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pseudo_disk_attach(struct disk *diskp)
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{
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disk_attach0(diskp);
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}
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/*
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* Detach a pseudo disk.
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*/
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void
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pseudo_disk_detach(struct disk *diskp)
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{
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disk_detach0(diskp);
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}
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/*
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* Mark the disk as busy for metrics collection.
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*/
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void
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disk_busy(struct disk *diskp)
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{
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iostat_busy(diskp->dk_stats);
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}
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/*
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* Finished disk operations, gather metrics.
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*/
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void
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disk_unbusy(struct disk *diskp, long bcount, int read)
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{
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iostat_unbusy(diskp->dk_stats, bcount, read);
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}
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/*
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* Bounds checking against the media size, used for the raw partition.
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* The sector size passed in should currently always be DEV_BSIZE,
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* and the media size the size of the device in DEV_BSIZE sectors.
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*/
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int
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bounds_check_with_mediasize(struct buf *bp, int secsize, uint64_t mediasize)
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{
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int64_t sz;
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sz = howmany(bp->b_bcount, secsize);
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if (bp->b_blkno + sz > mediasize) {
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sz = mediasize - bp->b_blkno;
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if (sz == 0) {
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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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goto done;
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}
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if (sz < 0) {
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/* If past end of disk, return EINVAL. */
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bp->b_error = EINVAL;
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goto bad;
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}
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/* Otherwise, truncate request. */
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bp->b_bcount = sz << DEV_BSHIFT;
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}
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return 1;
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bad:
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bp->b_flags |= B_ERROR;
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done:
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return 0;
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}
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/*
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* disk_ioctl --
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* Generic disk ioctl handling.
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*/
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int
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disk_ioctl(struct disk *diskp, u_long cmd, caddr_t data, int flag,
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struct lwp *l)
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{
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int error;
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switch (cmd) {
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case DIOCGDISKINFO:
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{
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struct plistref *pref = (struct plistref *) data;
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if (diskp->dk_info == NULL)
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error = ENOTSUP;
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else
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error = prop_dictionary_copyout_ioctl(pref, cmd,
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diskp->dk_info);
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break;
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}
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default:
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error = EPASSTHROUGH;
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}
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return (error);
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}
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