From 7c95271f88f33574c84fc1d5ee51df23b390c70e Mon Sep 17 00:00:00 2001 From: deraadt Date: Mon, 9 Dec 1996 15:54:57 +0000 Subject: [PATCH] arc port can use the same disksubr code, whee! --- sys/arch/arc/arc/disksubr.c | 456 +++++++++++++++++++++------------- sys/arch/i386/i386/disksubr.c | 3 +- 2 files changed, 288 insertions(+), 171 deletions(-) diff --git a/sys/arch/arc/arc/disksubr.c b/sys/arch/arc/arc/disksubr.c index 88cd87466bd..e1c185c5ba9 100644 --- a/sys/arch/arc/arc/disksubr.c +++ b/sys/arch/arc/arc/disksubr.c @@ -1,48 +1,55 @@ -/* $OpenBSD: disksubr.c,v 1.5 1996/09/27 19:14:08 pefo Exp $ */ +/* $OpenBSD: disksubr.c,v 1.6 1996/12/09 15:54:58 deraadt Exp $ */ +/* $NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $ */ /* - * Copyright (c) 1994, 1995 Carnegie-Mellon University. + * Copyright (c) 1996 Theo de Raadt + * Copyright (c) 1982, 1986, 1988 Regents of the University of California. * All rights reserved. * - * Authors: Keith Bostic, Chris G. Demetriou, Per Fogelstrom (R4000) - * - * Permission to use, copy, modify and distribute this software and - * its documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND - * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to + * 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. * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 + * 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. * - * any improvements or extensions that they make and grant Carnegie the - * rights to redistribute these changes. + * @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 */ #include +#include #include -#include #include #include +#include #include -#include -#include +#define b_cylin b_resid -#include -#include +int fat_types[] = { DOSPTYP_FAT12, DOSPTYP_FAT16S, + DOSPTYP_FAT16B, DOSPTYP_FAT16C, -1 }; -extern struct device *bootdv; - -/* was this the boot device ? */ void dk_establish(dk, dev) struct disk *dk; @@ -51,50 +58,61 @@ dk_establish(dk, dev) } /* - * Attempt to read a disk label from a device * using the indicated stategy routine. + * Attempt to read a disk label from a device + * using the indicated stategy routine. * The label must be partly set up before this: - * secpercyl and anything required in the strategy routine - * (e.g., sector size) must be filled in before calling us. + * secpercyl, secsize and anything required for a block i/o read + * operation in the driver's strategy/start routines + * must be filled in before calling us. + * + * If dos partition table requested, attempt to load it and + * find disklabel inside a DOS partition. Also, if bad block + * table needed, attempt to extract it as well. Return buffer + * for use in signalling errors if requested. + * * Returns null on success and an error string on failure. */ char * -readdisklabel(dev, strat, lp, clp) +readdisklabel(dev, strat, lp, osdep) dev_t dev; - void (*strat)(); - struct disklabel *lp; - struct cpu_disklabel *clp; + void (*strat) __P((struct buf *)); + register struct disklabel *lp; + struct cpu_disklabel *osdep; { + struct dos_partition *dp = osdep->dosparts, *dp2; + struct dkbad *bdp = &osdep->bad; struct buf *bp; struct disklabel *dlp; - struct dos_partition *dp = clp->dosparts; char *msg = NULL; - int dospart, dospartoff, i; + int dospartoff, cyl, i, *ip, ourpart = -1; /* minimal requirements for archtypal disk label */ + if (lp->d_secsize == 0) + lp->d_secsize = DEV_BSIZE; if (lp->d_secperunit == 0) - lp->d_secperunit = 0x1fffffff; + lp->d_secperunit = 0x1fffffff; lp->d_npartitions = RAW_PART + 1; - for(i = 0; i < RAW_PART; i++) { + for (i = 0; i < RAW_PART; i++) { lp->d_partitions[i].p_size = 0; lp->d_partitions[i].p_offset = 0; } - if (lp->d_partitions[RAW_PART].p_size == 0) - lp->d_partitions[RAW_PART].p_size = 0x1fffffff; - lp->d_partitions[RAW_PART].p_offset = 0; + if (lp->d_partitions[i].p_size == 0) + lp->d_partitions[i].p_size = 0x1fffffff; + lp->d_partitions[i].p_offset = 0; - /* obtain buffer to probe drive with */ + /* get a buffer and initialize it */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dev; - dospartoff = 0; - dospart = -1; /* do dos partitions in the process of getting disklabel? */ + dospartoff = 0; + cyl = LABELSECTOR / lp->d_secpercyl; if (dp) { /* read master boot record */ bp->b_blkno = DOSBBSECTOR; bp->b_bcount = lp->d_secsize; bp->b_flags = B_BUSY | B_READ; - bp->b_resid = 0; + bp->b_cylin = DOSBBSECTOR / lp->d_secpercyl; (*strat)(bp); /* if successful, wander through dos partition table */ @@ -102,75 +120,148 @@ readdisklabel(dev, strat, lp, clp) msg = "dos partition I/O error"; goto done; } - if (*(unsigned int *)(bp->b_data) == 0x8efac033) { - /* XXX how do we check veracity/bounds of this? */ - bcopy(bp->b_data + DOSPARTOFF, dp, NDOSPART * sizeof(*dp)); - - for (i = 0, dp = clp->dosparts; i < NDOSPART; i++, dp++) { - if (dp->dp_size && dp->dp_typ == DOSPTYP_OPENBSD - && dospart < 0) - dospart = i; - } - for (i = 0, dp = clp->dosparts; i < NDOSPART; i++, dp++) { - if (dp->dp_size && dp->dp_typ == DOSPTYP_386BSD - && dospart < 0) - dospart = i; - } - if(dospart >= 0) { - /* - * set part a to show OpenBSD part - */ - dp = clp->dosparts+dospart; - dospartoff = dp->dp_start; - - lp->d_partitions[0].p_size = dp->dp_size; - lp->d_partitions[0].p_offset = dp->dp_start; - lp->d_partitions[RAW_PART].p_size = dp->dp_size; - lp->d_partitions[RAW_PART].p_offset = dp->dp_start; - lp->d_ntracks = dp->dp_ehd + 1; - lp->d_nsectors = DPSECT(dp->dp_esect); - lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; + + /* XXX how do we check veracity/bounds of this? */ + bcopy(bp->b_data + DOSPARTOFF, dp, NDOSPART * sizeof(*dp)); + + /* + * Search for our MBR partition + */ + for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++) + if (dp2->dp_size && dp2->dp_typ == DOSPTYP_OPENBSD) + ourpart = i; + for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++) + if (dp2->dp_size && dp2->dp_typ == DOSPTYP_386BSD) + ourpart = i; + + if (ourpart != -1) { + dp2 = &dp[ourpart]; + + /* + * This is our MBR partition. need sector address + * for SCSI/IDE, cylinder for ESDI/ST506/RLL + */ + dospartoff = dp2->dp_start; + cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect); + + /* XXX build a temporary disklabel */ + lp->d_partitions[0].p_size = dp2->dp_size; + lp->d_partitions[0].p_offset = dp2->dp_start; + if (lp->d_ntracks == 0) + lp->d_ntracks = dp2->dp_ehd + 1; + if (lp->d_nsectors == 0) + lp->d_nsectors = DPSECT(dp2->dp_esect); + if (lp->d_secpercyl == 0) + lp->d_secpercyl = lp->d_ntracks * + lp->d_nsectors; + } + + /* + * In case the disklabel read below fails, we want to provide + * a fake label in which m/n/o/p are MBR partitions 0/1/2/3 + */ + for (dp2=dp, i=0; i < NDOSPART; i++, dp2++) { + lp->d_partitions[12+i].p_size = dp2->dp_size; + lp->d_partitions[12+i].p_offset = dp2->dp_start; + for (ip = fat_types; *ip != -1; ip++) { + if (dp2->dp_typ != *ip) + continue; + lp->d_partitions[12+i].p_fstype = + FS_MSDOS; } } - + lp->d_bbsize = 8192; + lp->d_sbsize = 64*1024; /* XXX ? */ + lp->d_npartitions = MAXPARTITIONS; } + /* next, dig out disk label */ bp->b_blkno = dospartoff + LABELSECTOR; - bp->b_resid = 0; + bp->b_cylin = cyl; bp->b_bcount = lp->d_secsize; bp->b_flags = B_BUSY | B_READ; - (*strat)(bp); + (*strat)(bp); /* if successful, locate disk label within block and validate */ if (biowait(bp)) { - msg = "disk label read error"; + /* XXX we return the faked label built so far */ + msg = "disk label I/O error"; goto done; } - - dlp = (struct disklabel *)(bp->b_un.b_addr + LABELOFFSET); - if (dlp->d_magic == DISKMAGIC) { - if (dkcksum(dlp)) { - msg = "OpenBSD disk label corrupted"; - goto done; + for (dlp = (struct disklabel *)bp->b_data; + dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - sizeof(*dlp)); + dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { + if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { + if (msg == NULL) + msg = "no disk label"; + } else if (dlp->d_npartitions > MAXPARTITIONS || + dkcksum(dlp) != 0) + msg = "disk label corrupted"; + else { + *lp = *dlp; + msg = NULL; + break; } - *lp = *dlp; + } + + if (msg) { +#if defined(CD9660) + if (iso_disklabelspoof(dev, strat, lp) == 0) + msg = NULL; +#endif goto done; } - msg = "no disk label"; + + /* obtain bad sector table if requested and present */ + if (bdp && (lp->d_flags & D_BADSECT)) { + struct dkbad *db; + + i = 0; + do { + /* read a bad sector table */ + bp->b_flags = B_BUSY | B_READ; + bp->b_blkno = lp->d_secperunit - lp->d_nsectors + i; + if (lp->d_secsize > DEV_BSIZE) + bp->b_blkno *= lp->d_secsize / DEV_BSIZE; + else + bp->b_blkno /= DEV_BSIZE / lp->d_secsize; + bp->b_bcount = lp->d_secsize; + bp->b_cylin = lp->d_ncylinders - 1; + (*strat)(bp); + + /* if successful, validate, otherwise try another */ + if (biowait(bp)) { + msg = "bad sector table I/O error"; + } else { + db = (struct dkbad *)(bp->b_data); +#define DKBAD_MAGIC 0x4321 + if (db->bt_mbz == 0 + && db->bt_flag == DKBAD_MAGIC) { + msg = NULL; + *bdp = *db; + break; + } else + msg = "bad sector table corrupted"; + } + } while ((bp->b_flags & B_ERROR) && (i += 2) < 10 && + i < lp->d_nsectors); + } + done: - bp->b_flags = B_INVAL | B_AGE | B_READ; + bp->b_flags |= B_INVAL; brelse(bp); return (msg); } /* - * Check new disk label for sensibility before setting it. + * Check new disk label for sensibility + * before setting it. */ int -setdisklabel(olp, nlp, openmask, clp) +setdisklabel(olp, nlp, openmask, osdep) register struct disklabel *olp, *nlp; u_long openmask; - struct cpu_disklabel *clp; + struct cpu_disklabel *osdep; { register i; register struct partition *opp, *npp; @@ -180,12 +271,20 @@ setdisklabel(olp, nlp, openmask, clp) (nlp->d_secsize % DEV_BSIZE) != 0) return(EINVAL); + /* special case to allow disklabel to be invalidated */ + if (nlp->d_magic == 0xffffffff) { + *olp = *nlp; + return (0); + } + if (nlp->d_magic != DISKMAGIC || nlp->d_magic2 != DISKMAGIC || - dkcksum(nlp) != 0) + dkcksum(nlp) != 0) return (EINVAL); - while ((i = ffs((long)openmask)) != 0) { - i--; + /* XXX missing check if other dos partitions will be overwritten */ + + while (openmask != 0) { + i = ffs(openmask) - 1; openmask &= ~(1 << i); if (nlp->d_npartitions <= i) return (EBUSY); @@ -194,9 +293,9 @@ setdisklabel(olp, nlp, openmask, clp) if (npp->p_offset != opp->p_offset || npp->p_size < opp->p_size) return (EBUSY); /* - * Copy internally-set partition information - * if new label doesn't include it. XXX - */ + * Copy internally-set partition information + * if new label doesn't include it. XXX + */ if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) { npp->p_fstype = opp->p_fstype; npp->p_fsize = opp->p_fsize; @@ -204,88 +303,101 @@ setdisklabel(olp, nlp, openmask, clp) npp->p_cpg = opp->p_cpg; } } - nlp->d_checksum = 0; - nlp->d_checksum = dkcksum(nlp); + nlp->d_checksum = 0; + nlp->d_checksum = dkcksum(nlp); *olp = *nlp; - return (0); + return (0); } + /* * Write disk label back to device after modification. - * this means write out the Rigid disk blocks to represent the - * label. Hope the user was carefull. */ int -writedisklabel(dev, strat, lp, clp) +writedisklabel(dev, strat, lp, osdep) dev_t dev; - void (*strat)(); + void (*strat) __P((struct buf *)); register struct disklabel *lp; - struct cpu_disklabel *clp; + struct cpu_disklabel *osdep; { - struct buf *bp; + struct dos_partition *dp = osdep->dosparts, *dp2; + struct buf *bp; struct disklabel *dlp; - struct dos_partition *dp = clp->dosparts; - int error = 0, i; - int dospart, dospartoff; + int error, dospartoff, cyl, i; + int ourpart = -1; + /* get a buffer and initialize it */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dev; - dospart = -1; - dospartoff = 0; /* do dos partitions in the process of getting disklabel? */ + dospartoff = 0; + cyl = LABELSECTOR / lp->d_secpercyl; if (dp) { /* read master boot record */ bp->b_blkno = DOSBBSECTOR; bp->b_bcount = lp->d_secsize; bp->b_flags = B_BUSY | B_READ; - bp->b_resid = 0; + bp->b_cylin = DOSBBSECTOR / lp->d_secpercyl; (*strat)(bp); - if (((error = biowait(bp)) == 0) - && *(unsigned int *)(bp->b_data) == 0x8efac033) { - /* XXX how do we check veracity/bounds of this? */ - bcopy(bp->b_data + DOSPARTOFF, dp, NDOSPART * sizeof(*dp)); - - for (i = 0, dp = clp->dosparts; i < NDOSPART; i++, dp++) { - if (dp->dp_size && dp->dp_typ == DOSPTYP_OPENBSD - && dospart < 0) { - dospart = i; - dospartoff = dp->dp_start; - } - } - for (i = 0, dp = clp->dosparts; i < NDOSPART; i++, dp++) { - if (dp->dp_size && dp->dp_typ == DOSPTYP_386BSD - && dospart < 0) { - dospart = i; - dospartoff = dp->dp_start; - } - } + if ((error = biowait(bp)) != 0) + goto done; + + /* XXX how do we check veracity/bounds of this? */ + bcopy(bp->b_data + DOSPARTOFF, dp, + NDOSPART * sizeof(*dp)); + + for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++) + if (dp2->dp_size && dp2->dp_typ == DOSPTYP_OPENBSD) + ourpart = i; + for (dp2=dp, i=0; i < NDOSPART && ourpart == -1; i++, dp2++) + if (dp2->dp_size && dp2->dp_typ == DOSPTYP_386BSD) + ourpart = i; + + if (ourpart != -1) { + dp2 = &dp[ourpart]; + + /* + * need sector address for SCSI/IDE, + * cylinder for ESDI/ST506/RLL + */ + dospartoff = dp2->dp_start; + cyl = DPCYL(dp2->dp_scyl, dp2->dp_ssect); } - } + + /* next, dig out disk label */ bp->b_blkno = dospartoff + LABELSECTOR; - bp->b_resid = 0; + bp->b_cylin = cyl; bp->b_bcount = lp->d_secsize; - bp->b_flags = B_READ; /* get current label */ + bp->b_flags = B_BUSY | B_READ; (*strat)(bp); - if (error = biowait(bp)) - goto done; - dlp = (struct disklabel *)(bp->b_un.b_addr + LABELOFFSET); - *dlp = *lp; /* struct assignment */ - - bp->b_flags = B_WRITE; - (*strat)(bp); - error = biowait(bp); + /* if successful, locate disk label within block and validate */ + if ((error = biowait(bp)) != 0) + goto done; + for (dlp = (struct disklabel *)bp->b_data; + dlp <= (struct disklabel *)(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) { + *dlp = *lp; + bp->b_flags = B_BUSY | B_WRITE; + (*strat)(bp); + error = biowait(bp); + goto done; + } + } + error = ESRCH; done: + bp->b_flags |= B_INVAL; brelse(bp); - return (error); + return (error); } - -/* +/* * Determine the size of the transfer, and make sure it is * within the boundaries of the partition. Adjust transfer * if needed, and signal errors or early completion. @@ -296,41 +408,45 @@ bounds_check_with_label(bp, lp, wlabel) struct disklabel *lp; int wlabel; { -#define dkpart(dev) (minor(dev) % MAXPARTITIONS ) + struct partition *p = lp->d_partitions + DISKPART(bp->b_dev); + int labelsector = lp->d_partitions[2].p_offset + LABELSECTOR; + int sz; - struct partition *p = lp->d_partitions + dkpart(bp->b_dev); - int labelsect = lp->d_partitions[RAW_PART].p_offset; - int maxsz = p->p_size; - int sz = (bp->b_bcount + DEV_BSIZE - 1) >> DEV_BSHIFT; + sz = howmany(bp->b_bcount, lp->d_secsize); - /* overwriting disk label ? */ - /* XXX should also protect bootstrap in first 8K */ - if (bp->b_blkno + p->p_offset == LABELSECTOR + labelsect && - (bp->b_flags & B_READ) == 0 && wlabel == 0) { - bp->b_error = EROFS; - goto bad; - } - - /* beyond partition? */ - if (bp->b_blkno < 0 || bp->b_blkno + sz > maxsz) { - /* if exactly at end of disk, return an EOF */ - if (bp->b_blkno == maxsz) { + if (bp->b_blkno + sz > p->p_size) { + sz = p->p_size - bp->b_blkno; + if (sz == 0) { + /* If exactly at end of disk, return EOF. */ bp->b_resid = bp->b_bcount; - return(0); + goto done; } - /* or truncate if part of it fits */ - sz = maxsz - bp->b_blkno; - if (sz <= 0) { + if (sz < 0) { + /* If past end of disk, return EINVAL. */ bp->b_error = EINVAL; goto bad; } + /* Otherwise, truncate request. */ bp->b_bcount = sz << DEV_BSHIFT; - } + } + + /* Overwriting disk label? */ + if (bp->b_blkno + p->p_offset <= labelsector && +#if LABELSECTOR != 0 + bp->b_blkno + p->p_offset + sz > labelsector && +#endif + (bp->b_flags & B_READ) == 0 && !wlabel) { + bp->b_error = EROFS; + goto bad; + } /* calculate cylinder for disksort to order transfers with */ - bp->b_resid = (bp->b_blkno + p->p_offset) / lp->d_secpercyl; - return(1); + bp->b_cylin = (bp->b_blkno + p->p_offset) / + (lp->d_secsize / DEV_BSIZE) / lp->d_secpercyl; + return (1); + bad: bp->b_flags |= B_ERROR; - return(-1); +done: + return (0); } diff --git a/sys/arch/i386/i386/disksubr.c b/sys/arch/i386/i386/disksubr.c index 49901b59cb4..8198bad893a 100644 --- a/sys/arch/i386/i386/disksubr.c +++ b/sys/arch/i386/i386/disksubr.c @@ -1,7 +1,8 @@ -/* $OpenBSD: disksubr.c,v 1.14 1996/12/09 07:19:22 deraadt Exp $ */ +/* $OpenBSD: disksubr.c,v 1.15 1996/12/09 15:54:57 deraadt Exp $ */ /* $NetBSD: disksubr.c,v 1.21 1996/05/03 19:42:03 christos Exp $ */ /* + * Copyright (c) 1996 Theo de Raadt * Copyright (c) 1982, 1986, 1988 Regents of the University of California. * All rights reserved. * -- 2.20.1