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-rw-r--r--libblkid/src/partitions/bsd.c188
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 }
+ }
+};
+