Current Path : /sys/boot/common/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/boot/common/disk.c |
/*- * Copyright (c) 1998 Michael Smith <msmith@freebsd.org> * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/boot/common/disk.c 227705 2011-11-19 10:49:03Z pjd $"); /* * MBR/GPT partitioned disk device handling. * * Ideas and algorithms from: * * - NetBSD libi386/biosdisk.c * - FreeBSD biosboot/disk.c * */ #include <stand.h> #include <sys/diskmbr.h> #include <sys/disklabel.h> #include <sys/gpt.h> #include <stdarg.h> #include <uuid.h> #include <bootstrap.h> #include "disk.h" #ifdef DISK_DEBUG # define DEBUG(fmt, args...) printf("%s: " fmt "\n" , __func__ , ## args) #else # define DEBUG(fmt, args...) #endif /* * Search for a slice with the following preferences: * * 1: Active FreeBSD slice * 2: Non-active FreeBSD slice * 3: Active Linux slice * 4: non-active Linux slice * 5: Active FAT/FAT32 slice * 6: non-active FAT/FAT32 slice */ #define PREF_RAWDISK 0 #define PREF_FBSD_ACT 1 #define PREF_FBSD 2 #define PREF_LINUX_ACT 3 #define PREF_LINUX 4 #define PREF_DOS_ACT 5 #define PREF_DOS 6 #define PREF_NONE 7 #ifdef LOADER_GPT_SUPPORT struct gpt_part { int gp_index; uuid_t gp_type; uint64_t gp_start; uint64_t gp_end; }; static uuid_t efi = GPT_ENT_TYPE_EFI; static uuid_t freebsd_boot = GPT_ENT_TYPE_FREEBSD_BOOT; static uuid_t freebsd_ufs = GPT_ENT_TYPE_FREEBSD_UFS; static uuid_t freebsd_swap = GPT_ENT_TYPE_FREEBSD_SWAP; static uuid_t freebsd_zfs = GPT_ENT_TYPE_FREEBSD_ZFS; static uuid_t ms_basic_data = GPT_ENT_TYPE_MS_BASIC_DATA; #endif #if defined(LOADER_GPT_SUPPORT) || defined(LOADER_MBR_SUPPORT) /* Given a size in 512 byte sectors, convert it to a human-readable number. */ static char * display_size(uint64_t size) { static char buf[80]; char unit; size /= 2; unit = 'K'; if (size >= 10485760000LL) { size /= 1073741824; unit = 'T'; } else if (size >= 10240000) { size /= 1048576; unit = 'G'; } else if (size >= 10000) { size /= 1024; unit = 'M'; } sprintf(buf, "%.6ld%cB", (long)size, unit); return (buf); } #endif #ifdef LOADER_MBR_SUPPORT static void disk_checkextended(struct disk_devdesc *dev, struct dos_partition *slicetab, int slicenum, int *nslicesp) { uint8_t buf[DISK_SECSIZE]; struct dos_partition *dp; uint32_t base; int rc, i, start, end; dp = &slicetab[slicenum]; start = *nslicesp; if (dp->dp_size == 0) goto done; if (dp->dp_typ != DOSPTYP_EXT) goto done; rc = dev->d_dev->dv_strategy(dev, F_READ, dp->dp_start, DISK_SECSIZE, (char *) buf, NULL); if (rc) goto done; if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) { DEBUG("no magic in extended table"); goto done; } base = dp->dp_start; dp = (struct dos_partition *) &buf[DOSPARTOFF]; for (i = 0; i < NDOSPART; i++, dp++) { if (dp->dp_size == 0) continue; if (*nslicesp == NEXTDOSPART) goto done; dp->dp_start += base; bcopy(dp, &slicetab[*nslicesp], sizeof(*dp)); (*nslicesp)++; } end = *nslicesp; /* * now, recursively check the slices we just added */ for (i = start; i < end; i++) disk_checkextended(dev, slicetab, i, nslicesp); done: return; } static int disk_readslicetab(struct disk_devdesc *dev, struct dos_partition **slicetabp, int *nslicesp) { struct dos_partition *slicetab = NULL; int nslices, i; int rc; uint8_t buf[DISK_SECSIZE]; /* * Find the slice in the DOS slice table. */ rc = dev->d_dev->dv_strategy(dev, F_READ, 0, DISK_SECSIZE, (char *) buf, NULL); if (rc) { DEBUG("error reading MBR"); return (rc); } /* * Check the slice table magic. */ if (buf[0x1fe] != 0x55 || buf[0x1ff] != 0xaa) { DEBUG("no slice table/MBR (no magic)"); return (rc); } /* * copy the partition table, then pick up any extended partitions. */ slicetab = malloc(NEXTDOSPART * sizeof(struct dos_partition)); bcopy(buf + DOSPARTOFF, slicetab, sizeof(struct dos_partition) * NDOSPART); nslices = NDOSPART; /* extended slices start here */ for (i = 0; i < NDOSPART; i++) disk_checkextended(dev, slicetab, i, &nslices); *slicetabp = slicetab; *nslicesp = nslices; return (0); } /* * Search for the best MBR slice (typically the first FreeBSD slice). */ static int disk_bestslice(struct dos_partition *slicetab, int nslices) { struct dos_partition *dp; int pref, preflevel; int i, prefslice; prefslice = 0; preflevel = PREF_NONE; dp = &slicetab[0]; for (i = 0; i < nslices; i++, dp++) { switch (dp->dp_typ) { case DOSPTYP_386BSD: /* FreeBSD */ pref = dp->dp_flag & 0x80 ? PREF_FBSD_ACT : PREF_FBSD; break; case DOSPTYP_LINUX: pref = dp->dp_flag & 0x80 ? PREF_LINUX_ACT : PREF_LINUX; break; case 0x01: /* DOS/Windows */ case 0x04: case 0x06: case 0x0b: case 0x0c: case 0x0e: pref = dp->dp_flag & 0x80 ? PREF_DOS_ACT : PREF_DOS; break; default: pref = PREF_NONE; } if (pref < preflevel) { preflevel = pref; prefslice = i + 1; } } return (prefslice); } static int disk_openmbr(struct disk_devdesc *dev) { struct dos_partition *slicetab = NULL, *dptr; int nslices, sector, slice; int rc; uint8_t buf[DISK_SECSIZE]; struct disklabel *lp; /* * Following calculations attempt to determine the correct value * for dev->d_offset by looking for the slice and partition specified, * or searching for reasonable defaults. */ rc = disk_readslicetab(dev, &slicetab, &nslices); if (rc) return (rc); /* * if a slice number was supplied but not found, this is an error. */ if (dev->d_slice > 0) { slice = dev->d_slice - 1; if (slice >= nslices) { DEBUG("slice %d not found", slice); rc = EPART; goto out; } } /* * Check for the historically bogus MBR found on true dedicated disks */ if (slicetab[3].dp_typ == DOSPTYP_386BSD && slicetab[3].dp_start == 0 && slicetab[3].dp_size == 50000) { sector = 0; goto unsliced; } /* * Try to auto-detect the best slice; this should always give * a slice number */ if (dev->d_slice == 0) { slice = disk_bestslice(slicetab, nslices); if (slice == -1) { rc = ENOENT; goto out; } dev->d_slice = slice; } /* * Accept the supplied slice number unequivocally (we may be looking * at a DOS partition). * Note: we number 1-4, offsets are 0-3 */ dptr = &slicetab[dev->d_slice - 1]; sector = dptr->dp_start; DEBUG("slice entry %d at %d, %d sectors", dev->d_slice - 1, sector, dptr->dp_size); unsliced: /* * Now we have the slice offset, look for the partition in the * disklabel if we have a partition to start with. * * XXX we might want to check the label checksum. */ if (dev->d_partition < 0) { /* no partition, must be after the slice */ DEBUG("opening raw slice"); dev->d_offset = sector; rc = 0; goto out; } rc = dev->d_dev->dv_strategy(dev, F_READ, sector + LABELSECTOR, DISK_SECSIZE, (char *) buf, NULL); if (rc) { DEBUG("error reading disklabel"); goto out; } lp = (struct disklabel *) buf; if (lp->d_magic != DISKMAGIC) { DEBUG("no disklabel"); rc = ENOENT; goto out; } if (dev->d_partition >= lp->d_npartitions) { DEBUG("partition '%c' exceeds partitions in table (a-'%c')", 'a' + dev->d_partition, 'a' + lp->d_npartitions); rc = EPART; goto out; } dev->d_offset = lp->d_partitions[dev->d_partition].p_offset - lp->d_partitions[RAW_PART].p_offset + sector; rc = 0; out: if (slicetab) free(slicetab); return (rc); } /* * Print out each valid partition in the disklabel of a FreeBSD slice. * For size calculations, we assume a 512 byte sector size. */ static void disk_printbsdslice(struct disk_devdesc *dev, daddr_t offset, char *prefix, int verbose) { char line[80]; char buf[DISK_SECSIZE]; struct disklabel *lp; int i, rc, fstype; /* read disklabel */ rc = dev->d_dev->dv_strategy(dev, F_READ, offset + LABELSECTOR, DISK_SECSIZE, (char *) buf, NULL); if (rc) return; lp =(struct disklabel *)(&buf[0]); if (lp->d_magic != DISKMAGIC) { sprintf(line, "%s: FFS bad disklabel\n", prefix); pager_output(line); return; } /* Print partitions */ for (i = 0; i < lp->d_npartitions; i++) { /* * For each partition, make sure we know what type of fs it * is. If not, then skip it. */ fstype = lp->d_partitions[i].p_fstype; if (fstype != FS_BSDFFS && fstype != FS_SWAP && fstype != FS_VINUM) continue; /* Only print out statistics in verbose mode */ if (verbose) sprintf(line, " %s%c: %s %s (%d - %d)\n", prefix, 'a' + i, (fstype == FS_SWAP) ? "swap " : (fstype == FS_VINUM) ? "vinum" : "FFS ", display_size(lp->d_partitions[i].p_size), lp->d_partitions[i].p_offset, (lp->d_partitions[i].p_offset + lp->d_partitions[i].p_size)); else sprintf(line, " %s%c: %s\n", prefix, 'a' + i, (fstype == FS_SWAP) ? "swap" : (fstype == FS_VINUM) ? "vinum" : "FFS"); pager_output(line); } } static void disk_printslice(struct disk_devdesc *dev, int slice, struct dos_partition *dp, char *prefix, int verbose) { char stats[80]; char line[80]; if (verbose) sprintf(stats, " %s (%d - %d)", display_size(dp->dp_size), dp->dp_start, dp->dp_start + dp->dp_size); else stats[0] = '\0'; switch (dp->dp_typ) { case DOSPTYP_386BSD: disk_printbsdslice(dev, (daddr_t)dp->dp_start, prefix, verbose); return; case DOSPTYP_LINSWP: sprintf(line, "%s: Linux swap%s\n", prefix, stats); break; case DOSPTYP_LINUX: /* * XXX * read the superblock to confirm this is an ext2fs partition? */ sprintf(line, "%s: ext2fs%s\n", prefix, stats); break; case 0x00: /* unused partition */ case DOSPTYP_EXT: return; case 0x01: sprintf(line, "%s: FAT-12%s\n", prefix, stats); break; case 0x04: case 0x06: case 0x0e: sprintf(line, "%s: FAT-16%s\n", prefix, stats); break; case 0x07: sprintf(line, "%s: NTFS/HPFS%s\n", prefix, stats); break; case 0x0b: case 0x0c: sprintf(line, "%s: FAT-32%s\n", prefix, stats); break; default: sprintf(line, "%s: Unknown fs: 0x%x %s\n", prefix, dp->dp_typ, stats); } pager_output(line); } static int disk_printmbr(struct disk_devdesc *dev, char *prefix, int verbose) { struct dos_partition *slicetab; int nslices, i; int rc; char line[80]; rc = disk_readslicetab(dev, &slicetab, &nslices); if (rc) return (rc); for (i = 0; i < nslices; i++) { sprintf(line, "%ss%d", prefix, i + 1); disk_printslice(dev, i, &slicetab[i], line, verbose); } free(slicetab); return (0); } #endif #ifdef LOADER_GPT_SUPPORT static int disk_readgpt(struct disk_devdesc *dev, struct gpt_part **gptp, int *ngptp) { struct dos_partition *dp; struct gpt_hdr *hdr; struct gpt_ent *ent; struct gpt_part *gptab = NULL; int entries_per_sec, rc, i, part; daddr_t lba, elba; uint8_t gpt[DISK_SECSIZE], tbl[DISK_SECSIZE]; /* * Following calculations attempt to determine the correct value * for dev->d_offset by looking for the slice and partition specified, * or searching for reasonable defaults. */ rc = 0; /* First, read the MBR and see if we have a PMBR. */ rc = dev->d_dev->dv_strategy(dev, F_READ, 0, DISK_SECSIZE, (char *) tbl, NULL); if (rc) { DEBUG("error reading MBR"); return (EIO); } /* Check the slice table magic. */ if (tbl[0x1fe] != 0x55 || tbl[0x1ff] != 0xaa) return (ENXIO); /* Check for GPT slice. */ part = 0; dp = (struct dos_partition *)(tbl + DOSPARTOFF); for (i = 0; i < NDOSPART; i++) { if (dp[i].dp_typ == 0xee) part++; else if ((part != 1) && (dp[i].dp_typ != 0x00)) return (EINVAL); } if (part != 1) return (EINVAL); /* Read primary GPT table header. */ rc = dev->d_dev->dv_strategy(dev, F_READ, 1, DISK_SECSIZE, (char *) gpt, NULL); if (rc) { DEBUG("error reading GPT header"); return (EIO); } hdr = (struct gpt_hdr *)gpt; if (bcmp(hdr->hdr_sig, GPT_HDR_SIG, sizeof(hdr->hdr_sig)) != 0 || hdr->hdr_lba_self != 1 || hdr->hdr_revision < 0x00010000 || hdr->hdr_entsz < sizeof(*ent) || DISK_SECSIZE % hdr->hdr_entsz != 0) { DEBUG("Invalid GPT header\n"); return (EINVAL); } /* Walk the partition table to count valid partitions. */ part = 0; entries_per_sec = DISK_SECSIZE / hdr->hdr_entsz; elba = hdr->hdr_lba_table + hdr->hdr_entries / entries_per_sec; for (lba = hdr->hdr_lba_table; lba < elba; lba++) { rc = dev->d_dev->dv_strategy(dev, F_READ, lba, DISK_SECSIZE, (char *) tbl, NULL); if (rc) { DEBUG("error reading GPT table"); return (EIO); } for (i = 0; i < entries_per_sec; i++) { ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); if (uuid_is_nil(&ent->ent_type, NULL) || ent->ent_lba_start == 0 || ent->ent_lba_end < ent->ent_lba_start) continue; part++; } } /* Save the important information about all the valid partitions. */ if (part != 0) { gptab = malloc(part * sizeof(struct gpt_part)); part = 0; for (lba = hdr->hdr_lba_table; lba < elba; lba++) { rc = dev->d_dev->dv_strategy(dev, F_READ, lba, DISK_SECSIZE, (char *) tbl, NULL); if (rc) { DEBUG("error reading GPT table"); free(gptab); return (EIO); } for (i = 0; i < entries_per_sec; i++) { ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); if (uuid_is_nil(&ent->ent_type, NULL) || ent->ent_lba_start == 0 || ent->ent_lba_end < ent->ent_lba_start) continue; gptab[part].gp_index = (lba - hdr->hdr_lba_table) * entries_per_sec + i + 1; gptab[part].gp_type = ent->ent_type; gptab[part].gp_start = ent->ent_lba_start; gptab[part].gp_end = ent->ent_lba_end; part++; } } } *gptp = gptab; *ngptp = part; return (0); } static struct gpt_part * disk_bestgpt(struct gpt_part *gpt, int ngpt) { struct gpt_part *gp, *prefpart; int i, pref, preflevel; prefpart = NULL; preflevel = PREF_NONE; gp = gpt; for (i = 0; i < ngpt; i++, gp++) { /* Windows. XXX: Also Linux. */ if (uuid_equal(&gp->gp_type, &ms_basic_data, NULL)) pref = PREF_DOS; /* FreeBSD */ else if (uuid_equal(&gp->gp_type, &freebsd_ufs, NULL) || uuid_equal(&gp->gp_type, &freebsd_zfs, NULL)) pref = PREF_FBSD; else pref = PREF_NONE; if (pref < preflevel) { preflevel = pref; prefpart = gp; } } return (prefpart); } static int disk_opengpt(struct disk_devdesc *dev) { struct gpt_part *gpt = NULL, *gp; int rc, ngpt, i; rc = disk_readgpt(dev, &gpt, &ngpt); if (rc) return (rc); /* Is this a request for the whole disk? */ if (dev->d_slice < 0) { dev->d_offset = 0; rc = 0; goto out; } /* * If a partition number was supplied, then the user is trying to use * an MBR address rather than a GPT address, so fail. */ if (dev->d_partition != 0xff) { rc = ENOENT; goto out; } /* If a slice number was supplied but not found, this is an error. */ gp = NULL; if (dev->d_slice > 0) { for (i = 0; i < ngpt; i++) { if (gpt[i].gp_index == dev->d_slice) { gp = &gpt[i]; break; } } if (gp == NULL) { DEBUG("partition %d not found", dev->d_slice); rc = ENOENT; goto out; } } /* Try to auto-detect the best partition. */ if (dev->d_slice == 0) { gp = disk_bestgpt(gpt, ngpt); if (gp == NULL) { rc = ENOENT; goto out; } dev->d_slice = gp->gp_index; } dev->d_offset = gp->gp_start; rc = 0; out: if (gpt) free(gpt); return (rc); } static void disk_printgptpart(struct disk_devdesc *dev, struct gpt_part *gp, char *prefix, int verbose) { char stats[80]; char line[96]; if (verbose) sprintf(stats, " %s", display_size(gp->gp_end + 1 - gp->gp_start)); else stats[0] = '\0'; if (uuid_equal(&gp->gp_type, &efi, NULL)) sprintf(line, "%s: EFI %s\n", prefix, stats); else if (uuid_equal(&gp->gp_type, &ms_basic_data, NULL)) sprintf(line, "%s: FAT/NTFS %s\n", prefix, stats); else if (uuid_equal(&gp->gp_type, &freebsd_boot, NULL)) sprintf(line, "%s: FreeBSD boot%s\n", prefix, stats); else if (uuid_equal(&gp->gp_type, &freebsd_ufs, NULL)) sprintf(line, "%s: FreeBSD UFS %s\n", prefix, stats); else if (uuid_equal(&gp->gp_type, &freebsd_zfs, NULL)) sprintf(line, "%s: FreeBSD ZFS %s\n", prefix, stats); else if (uuid_equal(&gp->gp_type, &freebsd_swap, NULL)) sprintf(line, "%s: FreeBSD swap%s\n", prefix, stats); else sprintf(line, "%s: %08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x%s\n", prefix, gp->gp_type.time_low, gp->gp_type.time_mid, gp->gp_type.time_hi_and_version, gp->gp_type.clock_seq_hi_and_reserved, gp->gp_type.clock_seq_low, gp->gp_type.node[0], gp->gp_type.node[1], gp->gp_type.node[2], gp->gp_type.node[3], gp->gp_type.node[4], gp->gp_type.node[5], stats); pager_output(line); } static int disk_printgpt(struct disk_devdesc *dev, char *prefix, int verbose) { struct gpt_part *gpt = NULL; int rc, ngpt, i; char line[80]; rc = disk_readgpt(dev, &gpt, &ngpt); if (rc) return (rc); for (i = 0; i < ngpt; i++) { sprintf(line, "%sp%d", prefix, i + 1); disk_printgptpart(dev, &gpt[i], line, verbose); } free(gpt); return (0); } #endif int disk_open(struct disk_devdesc *dev) { int rc; rc = 0; /* * While we are reading disk metadata, make sure we do it relative * to the start of the disk */ dev->d_offset = 0; #ifdef LOADER_GPT_SUPPORT rc = disk_opengpt(dev); if (rc == 0) return (0); #endif #ifdef LOADER_MBR_SUPPORT rc = disk_openmbr(dev); #endif return (rc); } void disk_print(struct disk_devdesc *dev, char *prefix, int verbose) { #ifdef LOADER_GPT_SUPPORT if (disk_printgpt(dev, prefix, verbose) == 0) return; #endif #ifdef LOADER_MBR_SUPPORT disk_printmbr(dev, prefix, verbose); #endif }