Adding upstream version 4.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

super-mbr.c

@@ -0,0 +1,206 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2010 Neil Brown <neilb@suse.de>
+ *
+ *
+ *    This program is free software; you can redistribute it and/or modify
+ *    it under the terms of the GNU General Public License as published by
+ *    the Free Software Foundation; either version 2 of the License, or
+ *    (at your option) any later version.
+ *
+ *    This program is distributed in the hope that it will be useful,
+ *    but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *    GNU General Public License for more details.
+ *
+ *    You should have received a copy of the GNU General Public License
+ *    along with this program; if not, write to the Free Software
+ *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *    Author: Neil Brown
+ *    Email: <neil@brown.name>
+ *
+ */
+
+/*
+ * 'mbr' is a pseudo metadata type for devices which have a
+ * partition table in the Master Boot Record (mbr) also known
+ * as a dos partition table.
+ *
+ * Obviously arrays cannot be created or assembled for this type.
+ * It is used to allow a new bare device to have an partition table
+ * added so the member partitions can then be included in other
+ * arrays as relevant.
+ *
+ * The meaning operations are:
+ * examine_super, but not brief_examine_super or export_examine
+ * load_super
+ * store_super
+ */
+
+#include "mdadm.h"
+#include "part.h"
+
+static void free_mbr(struct supertype *st)
+{
+	free(st->sb);
+	st->sb = NULL;
+}
+
+static void examine_mbr(struct supertype *st, char *homehost)
+{
+	struct MBR *sb = st->sb;
+	int i;
+
+	printf("   MBR Magic : %04x\n", sb->magic);
+	for (i = 0; i < MBR_PARTITIONS; i++)
+		/*
+		 * Have to make every access through sb rather than using a
+		 * pointer to the partition table (or an entry), since the
+		 * entries are not properly aligned.
+		 */
+		if (sb->parts[i].blocks_num)
+			printf("Partition[%d] : %12lu sectors at %12lu (type %02x)\n",
+			       i,
+			       (unsigned long)__le32_to_cpu(sb->parts[i].blocks_num),
+			       (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba),
+			       sb->parts[i].part_type);
+
+}
+
+static int load_super_mbr(struct supertype *st, int fd, char *devname)
+{
+	/* try to read an mbr
+	 * Return
+	 *  0 on success
+	 *  1 cannot get record
+	 *  2 record is meaningless
+	 */
+	struct MBR *super;
+
+	free_mbr(st);
+
+	if (posix_memalign((void**)&super, 512, 512) != 0) {
+		pr_err("could not allocate superblock\n");
+		return 1;
+	}
+
+	lseek(fd, 0, 0);
+	if (read(fd, super, sizeof(*super)) != sizeof(*super)) {
+		if (devname)
+			pr_err("Cannot read partition table on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+
+	if (super->magic != MBR_SIGNATURE_MAGIC) {
+		if (devname)
+			pr_err("No partition table found on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+
+	st->sb = super;
+
+	if (st->ss == NULL) {
+		st->ss = &mbr;
+		st->minor_version = 0;
+		st->max_devs = 1;
+		st->info = NULL;
+	}
+	return 0;
+}
+
+static int store_mbr(struct supertype *st, int fd)
+{
+	struct MBR *old, *super;
+
+	if (posix_memalign((void**)&old, 512, 512) != 0) {
+		pr_err("could not allocate superblock\n");
+		return 1;
+	}
+
+	lseek(fd, 0, 0);
+	if (read(fd, old, sizeof(*old)) != sizeof(*old)) {
+		free(old);
+		return 1;
+	}
+
+	super = st->sb;
+	memcpy(super->pad, old->pad, sizeof(super->pad));
+	free(old);
+	lseek(fd, 0, 0);
+	if (write(fd, super, sizeof(*super)) != sizeof(*super))
+		return 4;
+	fsync(fd);
+	ioctl(fd, BLKRRPART, 0);
+	return 0;
+}
+
+static void getinfo_mbr(struct supertype *st, struct mdinfo *info, char *map)
+{
+	struct MBR *sb = st->sb;
+	int i;
+
+	memset(&info->array, 0, sizeof(info->array));
+	memset(&info->disk, 0, sizeof(info->disk));
+	strcpy(info->text_version, "mbr");
+	strcpy(info->name, "mbr");
+	info->component_size = 0;
+
+	for (i = 0; i < MBR_PARTITIONS ; i++)
+		/*
+		 * Have to make every access through sb rather than using a
+		 * pointer to the partition table (or an entry), since the
+		 * entries are not properly aligned.
+		 */
+		if (sb->parts[i].blocks_num) {
+			unsigned long last =
+				(unsigned long)__le32_to_cpu(sb->parts[i].blocks_num)
+				+ (unsigned long)__le32_to_cpu(sb->parts[i].first_sect_lba);
+			if (last > info->component_size)
+				info->component_size = last;
+		}
+
+}
+
+static struct supertype *match_metadata_desc(char *arg)
+{
+	struct supertype *st;
+
+	if (strcmp(arg, "mbr") != 0)
+		return NULL;
+
+	st = xmalloc(sizeof(*st));
+	st->ss = &mbr;
+	st->info = NULL;
+	st->minor_version = 0;
+	st->max_devs = 1;
+	st->sb = NULL;
+	return st;
+}
+
+static int validate_geometry(struct supertype *st, int level,
+			     int layout, int raiddisks,
+			     int *chunk, unsigned long long size,
+			     unsigned long long data_offset,
+			     char *subdev, unsigned long long *freesize,
+			     int consistency_policy, int verbose)
+{
+	pr_err("mbr metadata cannot be used this way\n");
+	return 0;
+}
+
+struct superswitch mbr = {
+	.examine_super = examine_mbr,
+	.validate_geometry = validate_geometry,
+	.match_metadata_desc = match_metadata_desc,
+	.load_super = load_super_mbr,
+	.store_super = store_mbr,
+	.getinfo_super = getinfo_mbr,
+	.free_super = free_mbr,
+	.name = "mbr",
+};