/* $NetBSD: disksubr.c,v 1.30 2026/07/15 06:55:57 martin Exp $ */ /* * Copyright (c) 1998 Christopher G. Demetriou. 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 Christopher G. Demetriou * for the NetBSD Project. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* * 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. 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. * * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 */ /* * Copyright (c) 1995 Mark Brinicombe * 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. * * from: @(#)ufs_disksubr.c 7.16 (Berkeley) 5/4/91 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: disksubr.c,v 1.30 2026/07/15 06:55:57 martin Exp $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/buf.h> #include <sys/disklabel.h> #include <sys/syslog.h> #include <sys/device.h> #include <sys/disk.h> /* * Attempt to read a disk label from a device * using the indicated strategy 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. * * 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. */ const char * readdisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *osdep) { struct buf *bp; struct disklabel *dlp; const char *msg = NULL; int cyl, netbsdpartoff; /* minimal requirements for archetypal disk label */ if (lp->d_secsize == 0) lp->d_secsize = DEV_BSIZE; if (lp->d_secperunit == 0) lp->d_secperunit = 0x1fffffff; if (lp->d_npartitions < RAW_PART + 1) lp->d_npartitions = RAW_PART + 1; if (lp->d_partitions[RAW_PART].p_size == 0) { lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; lp->d_partitions[RAW_PART].p_offset = 0; lp->d_partitions[RAW_PART].p_size = 0x1fffffff; } /* * Set partition 'a' to be the whole disk. * Cleared if we find a netbsd label. */ lp->d_partitions[0].p_size = lp->d_partitions[RAW_PART].p_size; lp->d_partitions[0].p_fstype = FS_BSDFFS; /* obtain buffer to probe drive with */ bp = geteblk((int)lp->d_secsize); /* request no partition relocation by driver on I/O operations */ bp->b_dev = dev; /* do netbsd partitions in the process of getting disklabel? */ netbsdpartoff = 0; cyl = LABELSECTOR / lp->d_secpercyl; if (osdep) { if (filecore_label_read(dev, strat,lp, osdep, &msg, &cyl, &netbsdpartoff) || mbr_label_read(dev, strat, lp, osdep, &msg, &cyl, &netbsdpartoff)) { if (msg != NULL) goto done; } else { /* * We didn't find anything we like; NetBSD native. * netbsdpartoff and cyl should be unchanged. */ KASSERT(netbsdpartoff == 0); KASSERT(cyl == (LABELSECTOR / lp->d_secpercyl)); } } /* next, dig out disk label */ bp->b_blkno = netbsdpartoff + LABELSECTOR; bp->b_cylinder = bp->b_blkno / lp->d_secpercyl; bp->b_bcount = lp->d_secsize; bp->b_flags |= B_READ; (*strat)(bp); /* if successful, locate disk label within block and validate */ if (biowait(bp)) { msg = "disk label I/O error"; goto done; } for (dlp = (struct disklabel *)bp->b_data; dlp <= (struct disklabel *)((char *)bp->b_data + lp->d_secsize - sizeof(*dlp)); dlp = (struct disklabel *)((char *)dlp + sizeof(long))) { if (dlp->d_magic != DISKMAGIC || dlp->d_magic2 != DISKMAGIC) { continue; } else if (dlp->d_npartitions > MAXPARTITIONS || dkcksum(dlp) != 0) msg = "disk label corrupted"; else { *lp = *dlp; msg = NULL; break; } } done: brelse(bp, 0); return (msg); } /* * Write disk label back to device after modification. */ int writedisklabel(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp, struct cpu_disklabel *osdep) { struct buf *bp; struct disklabel *dlp; int cyl, netbsdpartoff; int error = 0, rv; /* get a buffer and initialize it */ bp = geteblk((int)lp->d_secsize); bp->b_dev = dev; /* do netbsd partitions in the process of getting disklabel? */ netbsdpartoff = 0; cyl = LABELSECTOR / lp->d_secpercyl; if (osdep) { if ((rv = filecore_label_locate(dev, strat,lp, osdep, &cyl, &netbsdpartoff)) != 0 || (rv = mbr_label_locate(dev, strat, lp, osdep, &cyl, &netbsdpartoff)) != 0) { if (rv > 0) goto done; } else { /* * We didn't find anything we like; NetBSD native. * netbsdpartoff and cyl should be unchanged. */ KASSERT(netbsdpartoff == 0); KASSERT(cyl == (LABELSECTOR / lp->d_secpercyl)); } } /* writelabel: */ #ifdef DEBUG_LABEL printf("%s: Reading disklabel addr=%08x\n", __func__, netbsdpartoff * DEV_BSIZE); #endif /* next, dig out disk label */ bp->b_blkno = netbsdpartoff + LABELSECTOR; bp->b_cylinder = cyl; bp->b_bcount = lp->d_secsize; bp->b_oflags &= ~(BO_DONE); bp->b_flags |= B_READ; (*strat)(bp); /* if successful, locate disk label within block and validate */ if ((error = biowait(bp))) goto done; for (dlp = (struct disklabel *)bp->b_data; dlp <= (struct disklabel *)((char *)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_READ); bp->b_oflags &= ~(BO_DONE); bp->b_flags |= B_WRITE; (*strat)(bp); error = biowait(bp); goto done; } } error = ESRCH; done: brelse(bp, 0); return (error); } /* End of disksubr.c */
