diff options
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/hppa/hppa/disksubr.c | 885 |
1 files changed, 885 insertions, 0 deletions
diff --git a/sys/arch/hppa/hppa/disksubr.c b/sys/arch/hppa/hppa/disksubr.c new file mode 100644 index 00000000000..9bfed643f09 --- /dev/null +++ b/sys/arch/hppa/hppa/disksubr.c @@ -0,0 +1,885 @@ +/* $OpenBSD: disksubr.c,v 1.1 1999/05/12 14:53:08 mickey Exp $ */ + +/* + * Copyright (c) 1999 Michael Shalayeff + * Copyright (c) 1997 Niklas Hallqvist + * Copyright (c) 1996 Theo de Raadt + * Copyright (c) 1982, 1986, 1988 Regents of the University of California. + * All rights reserved. + * + * 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 7.16 (Berkeley) 5/4/91 + */ + +/* + * This disksubr.c module started to take it's present form on OpenBSD/alpha + * but it was always thought it should be made completely MI and not need to + * be in that alpha-specific tree at all. + * + * XXX The DOS partitioning code is not endian-independent, only native + * endian DOS partition tables can be parsed yet. + * + * XXX Amiga RDB partitioning is not understood yet. + * + * XXX HPUX disklabel is not understood yet. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/buf.h> +#include <sys/device.h> +#include <sys/disklabel.h> +#include <sys/syslog.h> +#include <sys/disk.h> + +/* The native defaults... */ +#if defined(alpha) && !defined(DISKLABEL_ALPHA) +#define DISKLABEL_ALPHA +#elif (defined(i386) || defined(arc)) && !defined(DISKLABEL_I386) +#define DISKLABEL_I386 +#elif defined(amiga) && !defined(DISKLABEL_AMIGA) +#define DISKLABEL_AMIGA +#elif defined(hppa) && !defined(DISKLABEL_HPPA) +#define DISKLABEL_HPPA +#endif + +#define b_cylin b_resid + +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALPHA) || defined(DISKLABEL_AMIGA) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) +void swapdisklabel __P((struct disklabel *d)); +char *readbsdlabel __P((struct buf *, void (*) __P((struct buf *)), int, int, + int, int, struct disklabel *, int)); +#endif +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL) +char *readdoslabel __P((struct buf *, void (*) __P((struct buf *)), + struct disklabel *, struct cpu_disklabel *, int *, int *, int)); +#endif +#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL) +char *readamigalabel __P((struct buf *, void (*) __P((struct buf *)), + struct disklabel *, struct cpu_disklabel *, int)); +#endif +#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) +char *readliflabel __P((struct buf *, void (*) __P((struct buf *)), + struct disklabel *, struct cpu_disklabel *, int *, int *, int)); +#endif + +static enum disklabel_tag probe_order[] = { LABELPROBES, -1 }; + +void +dk_establish(dk, dev) + struct disk *dk; + struct device *dev; +{ +} + +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALPHA) || defined(DISKLABEL_AMIGA) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) + +/* + * Byteswap all the fields that might be swapped. + */ +void +swapdisklabel(dlp) + struct disklabel *dlp; +{ + int i; + struct partition *pp; + + swap32(dlp->d_magic); + swap16(dlp->d_type); + swap16(dlp->d_subtype); + swap32(dlp->d_secsize); + swap32(dlp->d_nsectors); + swap32(dlp->d_ntracks); + swap32(dlp->d_ncylinders); + swap32(dlp->d_secpercyl); + swap32(dlp->d_secperunit); + swap16(dlp->d_sparespertrack); + swap16(dlp->d_sparespercyl); + swap32(dlp->d_acylinders); + swap16(dlp->d_rpm); + swap16(dlp->d_interleave); + swap16(dlp->d_trackskew); + swap16(dlp->d_cylskew); + swap32(dlp->d_headswitch); + swap32(dlp->d_trkseek); + swap32(dlp->d_flags); + for (i = 0; i < NDDATA; i++) + swap32(dlp->d_drivedata[i]); + for (i = 0; i < NSPARE; i++) + swap32(dlp->d_spare[i]); + swap32(dlp->d_magic2); + swap16(dlp->d_checksum); + swap16(dlp->d_npartitions); + swap32(dlp->d_bbsize); + swap32(dlp->d_sbsize); + for (i = 0; i < MAXPARTITIONS; i++) { + pp = &dlp->d_partitions[i]; + swap32(pp->p_size); + swap32(pp->p_offset); + swap32(pp->p_fsize); + swap16(pp->p_cpg); + } +} + +/* + * Try to read a standard BSD disklabel at a certain sector. + */ +char * +readbsdlabel(bp, strat, cyl, sec, off, endian, lp, spoofonly) + struct buf *bp; + void (*strat) __P((struct buf *)); + int cyl, sec, off, endian; + struct disklabel *lp; + int spoofonly; +{ + struct disklabel *dlp; + char *msg = NULL; + u_int16_t cksum; + u_int32_t magic; + + if (endian != LITTLE_ENDIAN && endian != BIG_ENDIAN) + panic("readbsdlabel: unsupported byteorder %d", endian); + + /* don't read the on-disk label if we are in spoofed-only mode */ + if (spoofonly) + return (NULL); + + bp->b_blkno = sec; + bp->b_cylin = cyl; + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_BUSY | B_READ; + (*strat)(bp); + + /* if successful, locate disk label within block and validate */ + if (biowait(bp)) { + /* XXX we return the faked label built so far */ + msg = "disk label I/O error"; + return (msg); + } + + magic = endian == BIG_ENDIAN ? htobe32(DISKMAGIC) : htole32(DISKMAGIC); + + /* + * If off is negative, search until the end of the sector for + * the label, otherwise, just look at the specific location + * we're given. + */ + dlp = (struct disklabel *)(bp->b_data + (off >= 0 ? off : 0)); + do { + if (dlp->d_magic != magic || dlp->d_magic2 != magic) { + if (msg == NULL) + msg = "no disk label"; + } else { + cksum = dkcksum(dlp); + if (endian != BYTE_ORDER) + swapdisklabel(dlp); + if (dlp->d_npartitions > MAXPARTITIONS || cksum != 0) { + msg = "disk label corrupted"; + /* swap back if necessary. */ + if (off < 0 && endian != BYTE_ORDER) + swapdisklabel(dlp); + } else { + *lp = *dlp; + /* Recalc magic on foreign labels */ + if (endian != BYTE_ORDER) { + lp->d_checksum = 0; + lp->d_checksum = dkcksum(lp); + } + msg = NULL; + break; + } + } + if (off >= 0) + break; + dlp = (struct disklabel *)((char *)dlp + sizeof(int32_t)); + } while (dlp <= (struct disklabel *)(bp->b_data + lp->d_secsize - + sizeof(*dlp))); + return (msg); +} +#endif + +/* + * Attempt to read a disk label from a device + * using the indicated stategy routine. + * The label must be partly set up before this: + * 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. + * + * Returns null on success and an error string on failure. + */ +char * +readdisklabel(dev, strat, lp, osdep, spoofonly) + dev_t dev; + void (*strat) __P((struct buf *)); + struct disklabel *lp; + struct cpu_disklabel *osdep; + int spoofonly; +{ + struct buf *bp; + char *msg = "no disk label"; + enum disklabel_tag *tp; + int i; + struct disklabel minilabel, fallbacklabel; + + /* 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; + if (lp->d_secpercyl == 0) { + msg = "invalid geometry"; + goto done; + } + lp->d_npartitions = RAW_PART + 1; + 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[i].p_size == 0) + lp->d_partitions[i].p_size = 0x1fffffff; + lp->d_partitions[i].p_offset = 0; + minilabel = fallbacklabel = *lp; + + /* get a buffer and initialize it */ + bp = geteblk((int)lp->d_secsize); + bp->b_dev = dev; + + for (tp = probe_order; msg && *tp != -1; tp++) { + switch (*tp) { + case DLT_ALPHA: +#if defined(DISKLABEL_ALPHA) || defined(DISKLABEL_ALL) + msg = readbsdlabel(bp, strat, 0, ALPHA_LABELSECTOR, + ALPHA_LABELOFFSET, LITTLE_ENDIAN, lp, spoofonly); +#endif + break; + + case DLT_I386: +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL) + msg = readdoslabel(bp, strat, lp, osdep, 0, 0, spoofonly); + if (msg) + /* Fallback alternative */ + fallbacklabel = *lp; +#endif + break; + + case DLT_AMIGA: +#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL) + msg = readamigalabel(bp, strat, lp, osdep, spoofonly); +#endif + break; + + case DLT_HPPA: +#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) + msg = readliflabel(bp, strat, lp, osdep, 0, 0, spoofonly); +#endif + break; + + default: + panic("unrecognized disklabel tag %d", *tp); + } + if (msg) + *lp = minilabel; + } + + /* Record metainformation about the disklabel. */ + if (msg == NULL) { + osdep->labelsector = bp->b_blkno; + osdep->labeltag = *tp; + } + +#if defined(CD9660) + if (msg && iso_disklabelspoof(dev, strat, lp) == 0) + msg = NULL; +#endif + + /* If there was an error, still provide a decent fake one. */ + if (msg) + *lp = fallbacklabel; + +done: + bp->b_flags |= B_INVAL; + brelse(bp); + return (msg); +} + +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL) +/* + * 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. + * + * We would like to check if each MBR has a valid BOOT_MAGIC, but + * we cannot because it doesn't always exist. So.. we assume the + * MBR is valid. + */ +char * +readdoslabel(bp, strat, lp, osdep, partoffp, cylp, spoofonly) + struct buf *bp; + void (*strat) __P((struct buf *)); + struct disklabel *lp; + struct cpu_disklabel *osdep; + int *partoffp; + int *cylp; + int spoofonly; +{ + struct dos_partition *dp = osdep->u._i386.dosparts, *dp2; + struct dkbad *db, *bdp = &DKBAD(osdep); + char *msg = NULL, *cp; + int dospartoff, cyl, i, ourpart = -1; + dev_t dev; + + if (lp->d_secpercyl == 0) { + msg = "invalid label, d_secpercyl == 0"; + return (msg); + } + if (lp->d_secsize == 0) { + msg = "invalid label, d_secsize == 0"; + return (msg); + } + + /* do dos partitions in the process of getting disklabel? */ + dospartoff = 0; + cyl = I386_LABELSECTOR / lp->d_secpercyl; + if (dp) { + daddr_t part_blkno = DOSBBSECTOR; + unsigned long extoff = 0; + int wander = 1, n = 0, loop = 0; + + /* + * Read dos partition table, follow extended partitions. + * Map the partitions to disklabel entries i-p + */ + while (wander && n < 8 && loop < 8) { + loop++; + wander = 0; + + /* read boot record */ + bp->b_blkno = part_blkno; + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_BUSY | B_READ; + bp->b_cylin = part_blkno / lp->d_secpercyl; + (*strat)(bp); + + /* if successful, wander through dos partition table */ + if (biowait(bp)) { + msg = "dos partition I/O error"; + if (partoffp) + *partoffp = -1; + return (msg); + } + bcopy(bp->b_data + DOSPARTOFF, dp, + NDOSPART * sizeof(*dp)); + + if (ourpart == -1) { + /* 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_FREEBSD) + ourpart = i; + for (dp2=dp, i=0; + i < NDOSPART && ourpart == -1; i++, dp2++) + if (dp2->dp_size && + dp2->dp_typ == DOSPTYP_NETBSD) + ourpart = i; + if (ourpart == -1) + goto donot; + /* + * This is our MBR partition. need sector + * address for SCSI/IDE, cylinder for + * ESDI/ST506/RLL + */ + dp2 = &dp[ourpart]; + dospartoff = dp2->dp_start + part_blkno; + 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 + + part_blkno; + 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; + } +donot: + /* + * In case the disklabel read below fails, we want to + * provide a fake label in i-p. + */ + for (dp2=dp, i=0; i < NDOSPART && n < 8; i++, dp2++) { + struct partition *pp = &lp->d_partitions[8+n]; + + if (dp2->dp_typ == DOSPTYP_OPENBSD) + continue; + if (dp2->dp_size) + pp->p_size = dp2->dp_size; + if (dp2->dp_start) + pp->p_offset = + dp2->dp_start + part_blkno; + + switch (dp2->dp_typ) { + case DOSPTYP_UNUSED: + for (cp = (char *)dp2; + cp < (char *)(dp2 + 1); cp++) + if (*cp) + break; + /* + * Was it all zeroes? If so, it is + * an unused entry that we don't + * want to show. + */ + if (cp == (char *)(dp2 + 1)) + continue; + lp->d_partitions[8 + n++].p_fstype = + FS_UNUSED; + break; + + case DOSPTYP_LINUX: + pp->p_fstype = FS_EXT2FS; + n++; + break; + + case DOSPTYP_FAT12: + case DOSPTYP_FAT16S: + case DOSPTYP_FAT16B: + case DOSPTYP_FAT32: + case DOSPTYP_FAT32L: + case DOSPTYP_FAT16L: + pp->p_fstype = FS_MSDOS; + n++; + break; + case DOSPTYP_EXTEND: + part_blkno = dp2->dp_start + extoff; + if (!extoff) + extoff = dp2->dp_start; + wander = 1; + break; + default: + pp->p_fstype = FS_OTHER; + n++; + break; + } + } + } + lp->d_bbsize = 8192; + lp->d_sbsize = 64*1024; /* XXX ? */ + lp->d_npartitions = n > 0 ? n + 8 : 3; + } + + /* record the OpenBSD partition's placement for the caller */ + if (partoffp) + *partoffp = dospartoff; + if (cylp) + *cylp = cyl; + + /* next, dig out disk label */ + msg = readbsdlabel(bp, strat, cyl, dospartoff + I386_LABELSECTOR, -1, + LITTLE_ENDIAN, lp, spoofonly); + if (msg) + return (msg); + + /* obtain bad sector table if requested and present */ + if (bdp && (lp->d_flags & D_BADSECT)) { + /* + * get a new buffer and initialize it as callers trust the + * buffer given to us, to point at the disklabel sector. + */ + dev = bp->b_dev; + bp = geteblk((int)lp->d_secsize); + bp->b_dev = dev; + + 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); + + /* Give back the bad block buffer. */ + bp->b_flags |= B_INVAL; + brelse(bp); + } + return (msg); +} +#endif + +#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL) +/* + * XXX RDB parsing is missing still. + */ +char * +readamigalabel(bp, strat, lp, osdep, spoofonly) + struct buf *bp; + void (*strat) __P((struct buf *)); + struct disklabel *lp; + struct cpu_disklabel *osdep; + int spoofonly; +{ + char *msg; + + msg = readbsdlabel(bp, strat, 0, AMIGA_LABELSECTOR, AMIGA_LABELOFFSET, + BIG_ENDIAN, lp, spoofonly); + return (msg); +} +#endif + +#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) +char * +readliflabel (bp, strat, lp, osdep, partoffp, cylp, spoofonly) + struct buf *bp; + void (*strat) __P((struct buf *)); + struct disklabel *lp; + struct cpu_disklabel *osdep; + int *partoffp; + int *cylp; + int spoofonly; +{ + struct lifdir *p; + int fsoff; + + /* read LIF volume header */ + bp->b_blkno = btodb(LIF_VOLSTART); + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_BUSY | B_READ; + bp->b_cylin = btodb(LIF_VOLSTART) / lp->d_secpercyl; + (*strat)(bp); + + if (biowait(bp)) { + if (partoffp) + *partoffp = -1; + return "LIF volume header I/O error"; + } + + bcopy (bp->b_data, &osdep->u._hppa.lifvol, sizeof(struct lifvol)); + if (osdep->u._hppa.lifvol.vol_id != LIF_VOL_ID) { + if (partoffp) + *partoffp = -1; + return "no LIF volume found"; + } + + /* read LIF directory */ + bp->b_blkno = btodb(LIF_DIRSTART); + bp->b_bcount = lp->d_secsize; + bp->b_flags = B_BUSY | B_READ; + bp->b_cylin = (LIF_DIRSTART) / lp->d_secpercyl; + (*strat)(bp); + + if (biowait(bp)) { + if (partoffp) + *partoffp = -1; + return "LIF directory I/O error"; + } + + bcopy(bp->b_data, osdep->u._hppa.lifdir, LIF_DIRSIZE); + /* scan for LIF_DIR_FS dir entry */ + for (fsoff = -1, p = &osdep->u._hppa.lifdir[0]; + fsoff < 0 && p < &osdep->u._hppa.lifdir[LIF_NUMDIR]; p++) + if (p->dir_type == LIF_DIR_FS) + fsoff = lifstodb(p->dir_addr); + + /* if no suitable lifdir entry found assume LIF_FILESTART */ + if (fsoff < 0) + fsoff = btodb(LIF_FILESTART); + + *partoffp = fsoff; + + return readbsdlabel(bp, strat, 0, fsoff + HPPA_LABELSECTOR, + HPPA_LABELOFFSET, BIG_ENDIAN, lp, spoofonly); +} +#endif + +/* + * Check new disk label for sensibility + * before setting it. + */ +int +setdisklabel(olp, nlp, openmask, osdep) + struct disklabel *olp, *nlp; + u_long openmask; + struct cpu_disklabel *osdep; +{ + int i; + struct partition *opp, *npp; + + /* sanity clause */ + if (nlp->d_secpercyl == 0 || nlp->d_secsize == 0 || + (nlp->d_secsize % DEV_BSIZE) != 0) + return(EINVAL); + + /* + * XXX Nice thought, but it doesn't work, if the intention was to + * force a reread at the next *readdisklabel call. That does not + * happen. There's still some use for it though as you can pseudo- + * partitition the disk. + * + * 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) + return (EINVAL); + + /* XXX missing check if other dos partitions will be overwritten */ + + while (openmask != 0) { + i = ffs((long)openmask) - 1; + openmask &= ~(1 << i); + if (nlp->d_npartitions <= i) + return (EBUSY); + opp = &olp->d_partitions[i]; + npp = &nlp->d_partitions[i]; + 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 + */ + if (npp->p_fstype == FS_UNUSED && opp->p_fstype != FS_UNUSED) { + npp->p_fstype = opp->p_fstype; + npp->p_fsize = opp->p_fsize; + npp->p_frag = opp->p_frag; + npp->p_cpg = opp->p_cpg; + } + } + nlp->d_checksum = 0; + nlp->d_checksum = dkcksum(nlp); + *olp = *nlp; + return (0); +} + + +/* + * Write disk label back to device after modification. + */ +int +writedisklabel(dev, strat, lp, osdep) + dev_t dev; + void (*strat) __P((struct buf *)); + struct disklabel *lp; + struct cpu_disklabel *osdep; +{ + enum disklabel_tag *tp; + char *msg = "no disk label"; + struct buf *bp; + struct disklabel dl; +#if defined(DISKLABEL_I386) || defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) + struct cpu_disklabel cdl; +#endif + int labeloffset, error, i, endian, partoff = 0, cyl = 0; + u_int64_t csum, *p; + + /* get a buffer and initialize it */ + bp = geteblk((int)lp->d_secsize); + bp->b_dev = dev; + + /* + * I once played with the thought of using osdep->label{tag,sector} + * as a cache for knowing where (and what) to write. However, now I + * think it might be useful to reprobe if someone has written + * a newer disklabel of another type with disklabel(8) and -r. + */ + for (tp = probe_order; msg && *tp != -1; tp++) { + dl = *lp; + switch (*tp) { + case DLT_ALPHA: +#if defined(DISKLABEL_ALPHA) || defined(DISKLABEL_ALL) + msg = readbsdlabel(bp, strat, 0, ALPHA_LABELSECTOR, + ALPHA_LABELOFFSET, LITTLE_ENDIAN, &dl, 0); + labeloffset = ALPHA_LABELOFFSET; + endian = LITTLE_ENDIAN; +#endif + break; + + case DLT_I386: +#if defined(DISKLABEL_I386) || defined(DISKLABEL_ALL) + msg = readdoslabel(bp, strat, &dl, &cdl, &partoff, + &cyl, 0); + labeloffset = I386_LABELOFFSET; + endian = LITTLE_ENDIAN; +#endif + break; + + case DLT_AMIGA: +#if defined(DISKLABEL_AMIGA) || defined(DISKLABEL_ALL) + msg = readamigalabel(bp, strat, &dl, &cdl, 0); + labeloffset = AMIGA_LABELOFFSET; + endian = BIG_ENDIAN; +#endif + break; + + case DLT_HPPA: +#if defined(DISKLABEL_HPPA) || defined(DISKLABEL_ALL) + msg = readliflabel(bp, strat, &dl, &cdl, &partoff, + &cyl, 0); + labeloffset = HPPA_LABELOFFSET; + endian = BIG_ENDIAN; +#endif + break; + + default: + panic("unrecognized disklabel tag %d", *tp); + } + } + + if (msg) { + if (partoff == -1) + return EIO; + + /* Write it in the regular place with native byte order. */ + labeloffset = LABELOFFSET; + endian = BYTE_ORDER; + bp->b_blkno = partoff + LABELSECTOR; + bp->b_cylin = cyl; + bp->b_bcount = lp->d_secsize; + } + + if (endian != BYTE_ORDER) { + swapdisklabel(lp); + /* recalc checksum */ + lp->d_checksum = 0; + lp->d_checksum = dkcksum(lp); + } + + *(struct disklabel *)(bp->b_data + labeloffset) = *lp; + + /* Alpha bootblocks are checksummed. */ + if (*tp == DLT_ALPHA) { + for (csum = i = 0, p = (u_int64_t *)bp->b_data; i < 63; i++) + csum += *p++; + *p = csum; + } + + bp->b_flags = B_BUSY | B_WRITE; + (*strat)(bp); + error = biowait(bp); + + bp->b_flags |= B_INVAL; + brelse(bp); + 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. + */ +int +bounds_check_with_label(bp, lp, osdep, wlabel) + struct buf *bp; + struct disklabel *lp; + struct cpu_disklabel *osdep; + int wlabel; +{ +#define blockpersec(count, lp) ((count) * (((lp)->d_secsize) / DEV_BSIZE)) + struct partition *p = lp->d_partitions + DISKPART(bp->b_dev); + int labelsector = blockpersec(lp->d_partitions[RAW_PART].p_offset, + lp) + osdep->labelsector; + int sz = howmany(bp->b_bcount, DEV_BSIZE); + + /* avoid division by zero */ + if (lp->d_secpercyl == 0) { + bp->b_error = EINVAL; + goto bad; + } + + /* beyond partition? */ + if (bp->b_blkno + sz > blockpersec(p->p_size, lp)) { + sz = blockpersec(p->p_size, lp) - bp->b_blkno; + if (sz == 0) { + /* If exactly at end of disk, return EOF. */ + bp->b_resid = bp->b_bcount; + goto done; + } + 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 + blockpersec(p->p_offset, lp) <= labelsector && + bp->b_blkno + blockpersec(p->p_offset, lp) + sz > labelsector && + (bp->b_flags & B_READ) == 0 && !wlabel) { + bp->b_error = EROFS; + goto bad; + } + + /* calculate cylinder for disksort to order transfers with */ + bp->b_cylin = (bp->b_blkno + blockpersec(p->p_offset, lp)) / + lp->d_secpercyl; + return (1); + +bad: + bp->b_flags |= B_ERROR; +done: + return (0); +} |