diff options
Diffstat (limited to 'libblkid/src/partitions/bsd.c')
| -rw-r--r-- | libblkid/src/partitions/bsd.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/libblkid/src/partitions/bsd.c b/libblkid/src/partitions/bsd.c new file mode 100644 index 0000000..7a0b231 --- /dev/null +++ b/libblkid/src/partitions/bsd.c @@ -0,0 +1,188 @@ +/* + * BSD/OSF partition parsing code + * + * Copyright (C) 2009 Karel Zak <kzak@redhat.com> + * + * This file may be redistributed under the terms of the + * GNU Lesser General Public License. + * + * Inspired by fdisk, partx, Linux kernel, libparted and openbsd header files. + */ +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <stdint.h> + +#include "partitions.h" +#include "pt-bsd.h" + +/* Returns 'blkid_idmag' in 512-sectors */ +#define BLKID_MAG_SECTOR(_mag) (((_mag)->kboff / 2) + ((_mag)->sboff >> 9)) + +/* Returns 'blkid_idmag' in bytes */ +#define BLKID_MAG_OFFSET(_mag) ((_mag)->kboff << 10) + ((_mag)->sboff) + +/* Returns 'blkid_idmag' offset in bytes within the last sector */ +#define BLKID_MAG_LASTOFFSET(_mag) \ + (BLKID_MAG_OFFSET(_mag) - (BLKID_MAG_SECTOR(_mag) << 9)) + +static int probe_bsd_pt(blkid_probe pr, const struct blkid_idmag *mag) +{ + struct bsd_disklabel *l; + struct bsd_partition *p; + const char *name = "bsd" ; + blkid_parttable tab = NULL; + blkid_partition parent; + blkid_partlist ls; + int i, nparts = BSD_MAXPARTITIONS; + unsigned char *data; + int rc = BLKID_PROBE_NONE; + uint32_t abs_offset = 0; + + if (blkid_partitions_need_typeonly(pr)) + /* caller does not ask for details about partitions */ + return rc; + + data = blkid_probe_get_sector(pr, BLKID_MAG_SECTOR(mag)); + if (!data) { + if (errno) + rc = -errno; + goto nothing; + } + + l = (struct bsd_disklabel *) (data + BLKID_MAG_LASTOFFSET(mag)); + + ls = blkid_probe_get_partlist(pr); + if (!ls) + goto nothing; + + /* try to determine the real type of BSD system according to + * (parental) primary partition */ + parent = blkid_partlist_get_parent(ls); + if (parent) { + switch(blkid_partition_get_type(parent)) { + case MBR_FREEBSD_PARTITION: + name = "freebsd"; + abs_offset = blkid_partition_get_start(parent); + break; + case MBR_NETBSD_PARTITION: + name = "netbsd"; + break; + case MBR_OPENBSD_PARTITION: + name = "openbsd"; + break; + default: + DBG(LOWPROBE, ul_debug( + "WARNING: BSD label detected on unknown (0x%x) " + "primary partition", + blkid_partition_get_type(parent))); + break; + } + } + + tab = blkid_partlist_new_parttable(ls, name, BLKID_MAG_OFFSET(mag)); + if (!tab) { + rc = -ENOMEM; + goto nothing; + } + + if (le16_to_cpu(l->d_npartitions) < BSD_MAXPARTITIONS) + nparts = le16_to_cpu(l->d_npartitions); + + else if (le16_to_cpu(l->d_npartitions) > BSD_MAXPARTITIONS) + DBG(LOWPROBE, ul_debug( + "WARNING: ignore %d more BSD partitions", + le16_to_cpu(l->d_npartitions) - BSD_MAXPARTITIONS)); + + for (i = 0, p = l->d_partitions; i < nparts; i++, p++) { + blkid_partition par; + uint32_t start, size; + + if (p->p_fstype == BSD_FS_UNUSED) + continue; + + start = le32_to_cpu(p->p_offset); + size = le32_to_cpu(p->p_size); + + /* FreeBSD since version 10 uses relative offsets. We can use + * 3rd partition (special wholedisk partition) to detect this + * situation. + */ + if (abs_offset && nparts >= 3 + && le32_to_cpu(l->d_partitions[2].p_offset) == 0) + start += abs_offset; + + if (parent && blkid_partition_get_start(parent) == start + && blkid_partition_get_size(parent) == size) { + DBG(LOWPROBE, ul_debug( + "WARNING: BSD partition (%d) same like parent, " + "ignore", i)); + continue; + } + if (parent && !blkid_is_nested_dimension(parent, start, size)) { + DBG(LOWPROBE, ul_debug( + "WARNING: BSD partition (%d) overflow " + "detected, ignore", i)); + continue; + } + + par = blkid_partlist_add_partition(ls, tab, start, size); + if (!par) { + rc = -ENOMEM; + goto nothing; + } + + blkid_partition_set_type(par, p->p_fstype); + } + + return BLKID_PROBE_OK; + +nothing: + return rc; +} + + +/* + * All BSD variants use the same magic string (little-endian), + * and the same disklabel. + * + * The difference between {Free,Open,...}BSD is in the (parental) + * primary partition type. + * + * See also: http://en.wikipedia.org/wiki/BSD_disklabel + * + * The location of BSD disk label is architecture specific and in defined by + * LABELSECTOR and LABELOFFSET macros in the disklabel.h file. The location + * also depends on BSD variant, FreeBSD uses only one location, NetBSD and + * OpenBSD are more creative... + * + * The basic overview: + * + * arch | LABELSECTOR | LABELOFFSET + * ------------------------+-------------+------------ + * amd64 arm hppa hppa64 | | + * i386, macppc, mvmeppc | 1 | 0 + * sgi, aviion, sh, socppc | | + * ------------------------+-------------+------------ + * alpha luna88k mac68k | 0 | 64 + * sparc(OpenBSD) vax | | + * ------------------------+-------------+------------ + * sparc64 sparc(NetBSD) | 0 | 128 + * ------------------------+-------------+------------ + * + * ...and more (see http://fxr.watson.org/fxr/ident?v=NETBSD;i=LABELSECTOR) + * + */ +const struct blkid_idinfo bsd_pt_idinfo = +{ + .name = "bsd", + .probefunc = probe_bsd_pt, + .magics = + { + { .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 512 }, + { .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 64 }, + { .magic = "\x57\x45\x56\x82", .len = 4, .sboff = 128 }, + { NULL } + } +}; + |