Adding upstream version 4.2.upstream/4.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1350 insertions, 0 deletions

diff --git a/super0.c b/super0.c
new file mode 100644
index 0000000..b79b97a
--- /dev/null
+++ b/super0.c
@@ -0,0 +1,1350 @@
+/*
+ * mdadm - manage Linux "md" devices aka RAID arrays.
+ *
+ * Copyright (C) 2001-2009 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: <neilb@suse.de>
+ */
+
+#define HAVE_STDINT_H 1
+#include "mdadm.h"
+#include "sha1.h"
+/*
+ * All handling for the 0.90.0 version superblock is in
+ * this file.
+ * This includes:
+ *   - finding, loading, and writing the superblock.
+ *   - initialising a new superblock
+ *   - printing the superblock for --examine
+ *   - printing part of the superblock for --detail
+ * .. other stuff
+ */
+
+static unsigned long calc_sb0_csum(mdp_super_t *super)
+{
+	unsigned long csum = super->sb_csum;
+	unsigned long newcsum;
+	super->sb_csum= 0 ;
+	newcsum = calc_csum(super, MD_SB_BYTES);
+	super->sb_csum = csum;
+	return newcsum;
+}
+
+static void super0_swap_endian(struct mdp_superblock_s *sb)
+{
+	/* as super0 superblocks are host-endian, it is sometimes
+	 * useful to be able to swap the endianness
+	 * as (almost) everything is u32's we byte-swap every 4byte
+	 * number.
+	 * We then also have to swap the events_hi and events_lo
+	 */
+	char *sbc = (char *)sb;
+	__u32 t32;
+	int i;
+
+	for (i=0; i < MD_SB_BYTES ; i+=4) {
+		char t = sbc[i];
+		sbc[i] = sbc[i+3];
+		sbc[i+3] = t;
+		t=sbc[i+1];
+		sbc[i+1]=sbc[i+2];
+		sbc[i+2]=t;
+	}
+	t32 = sb->events_hi;
+	sb->events_hi = sb->events_lo;
+	sb->events_lo = t32;
+
+	t32 = sb->cp_events_hi;
+	sb->cp_events_hi = sb->cp_events_lo;
+	sb->cp_events_lo = t32;
+
+}
+
+static void examine_super0(struct supertype *st, char *homehost)
+{
+	mdp_super_t *sb = st->sb;
+	time_t atime;
+	int d;
+	int delta_extra = 0;
+	char *c;
+
+	printf("          Magic : %08x\n", sb->md_magic);
+	printf("        Version : %d.%02d.%02d\n",
+	       sb->major_version, sb->minor_version, sb->patch_version);
+	if (sb->minor_version >= 90) {
+		printf("           UUID : %08x:%08x:%08x:%08x", sb->set_uuid0,
+		       sb->set_uuid1, sb->set_uuid2, sb->set_uuid3);
+		if (homehost) {
+			char buf[20];
+			void *hash;
+
+			hash = sha1_buffer(homehost, strlen(homehost), buf);
+			if (memcmp(&sb->set_uuid2, hash, 8) == 0)
+				printf(" (local to host %s)", homehost);
+		}
+		printf("\n");
+	} else
+		printf("           UUID : %08x\n", sb->set_uuid0);
+
+	if (sb->not_persistent)
+		printf("           Eedk : not persistent\n");
+
+	atime = sb->ctime;
+	printf("  Creation Time : %.24s\n", ctime(&atime));
+	c = map_num(pers, sb->level);
+	printf("     Raid Level : %s\n", c?c:"-unknown-");
+	if ((int)sb->level > 0) {
+		int ddsks = 0, ddsks_denom = 1;
+		printf("  Used Dev Size : %d%s\n", sb->size,
+		       human_size((long long)sb->size<<10));
+		switch(sb->level) {
+		case 1:
+			ddsks=1;
+			break;
+		case 4:
+		case 5:
+			ddsks = sb->raid_disks - 1;
+			break;
+		case 6:
+			ddsks = sb->raid_disks - 2;
+			break;
+		case 10:
+			ddsks = sb->raid_disks;
+			ddsks_denom =
+				(sb->layout & 255) * ((sb->layout >> 8) & 255);
+		}
+		if (ddsks) {
+			long long asize = sb->size;
+			asize = (asize << 10) * ddsks / ddsks_denom;
+			printf("     Array Size : %llu%s\n",
+			       asize >> 10,  human_size(asize));
+		}
+	}
+	printf("   Raid Devices : %d\n", sb->raid_disks);
+	printf("  Total Devices : %d\n", sb->nr_disks);
+	printf("Preferred Minor : %d\n", sb->md_minor);
+	printf("\n");
+	if (sb->minor_version > 90 && (sb->reshape_position + 1) != 0) {
+		printf("  Reshape pos'n : %llu%s\n",
+		       (unsigned long long)sb->reshape_position / 2,
+		       human_size((long long)sb->reshape_position << 9));
+		if (sb->delta_disks) {
+			printf("  Delta Devices : %d", sb->delta_disks);
+			printf(" (%d->%d)\n", sb->raid_disks-sb->delta_disks,
+			       sb->raid_disks);
+			if (((int)sb->delta_disks) < 0)
+				delta_extra = - sb->delta_disks;
+		}
+		if (sb->new_level != sb->level) {
+			c = map_num(pers, sb->new_level);
+			printf("      New Level : %s\n", c?c:"-unknown-");
+		}
+		if (sb->new_layout != sb->layout) {
+			if (sb->level == 5) {
+				c = map_num(r5layout, sb->new_layout);
+				printf("     New Layout : %s\n",
+				       c?c:"-unknown-");
+			}
+			if (sb->level == 6) {
+				c = map_num(r6layout, sb->new_layout);
+				printf("     New Layout : %s\n",
+				       c?c:"-unknown-");
+			}
+			if (sb->level == 10) {
+				printf("     New Layout : near=%d, %s=%d\n",
+				       sb->new_layout&255,
+				       (sb->new_layout&0x10000)?"offset":"far",
+				       (sb->new_layout>>8)&255);
+			}
+		}
+		if (sb->new_chunk != sb->chunk_size)
+			printf("  New Chunksize : %d\n", sb->new_chunk);
+		printf("\n");
+	}
+	atime = sb->utime;
+	printf("    Update Time : %.24s\n", ctime(&atime));
+	printf("          State : %s\n",
+	       (sb->state&(1 << MD_SB_CLEAN)) ? "clean":"active");
+	if (sb->state & (1 << MD_SB_BITMAP_PRESENT))
+		printf("Internal Bitmap : present\n");
+	printf(" Active Devices : %d\n", sb->active_disks);
+	printf("Working Devices : %d\n", sb->working_disks);
+	printf(" Failed Devices : %d\n", sb->failed_disks);
+	printf("  Spare Devices : %d\n", sb->spare_disks);
+	if (calc_sb0_csum(sb) == sb->sb_csum)
+		printf("       Checksum : %x - correct\n", sb->sb_csum);
+	else
+		printf("       Checksum : %x - expected %lx\n",
+		       sb->sb_csum, calc_sb0_csum(sb));
+	printf("         Events : %llu\n",
+	       ((unsigned long long)sb->events_hi << 32) + sb->events_lo);
+	printf("\n");
+	if (sb->level == 5) {
+		c = map_num(r5layout, sb->layout);
+		printf("         Layout : %s\n", c?c:"-unknown-");
+	}
+	if (sb->level == 6) {
+		c = map_num(r6layout, sb->layout);
+		printf("         Layout : %s\n", c?c:"-unknown-");
+	}
+	if (sb->level == 10) {
+		printf("         Layout :");
+		print_r10_layout(sb->layout);
+		printf("\n");
+	}
+	switch(sb->level) {
+	case 0:
+	case 4:
+	case 5:
+	case 6:
+	case 10:
+		printf("     Chunk Size : %dK\n", sb->chunk_size / 1024);
+		break;
+	case -1:
+		printf("       Rounding : %dK\n", sb->chunk_size / 1024);
+		break;
+	default:
+		break;
+	}
+	printf("\n");
+	printf("      Number   Major   Minor   RaidDevice State\n");
+	for (d = -1;
+	     d < (signed int)(sb->raid_disks + delta_extra + sb->spare_disks);
+	     d++) {
+		mdp_disk_t *dp;
+		char *dv;
+		char nb[11];
+		int wonly, failfast;
+		if (d>=0) dp = &sb->disks[d];
+		else dp = &sb->this_disk;
+		snprintf(nb, sizeof(nb), "%4d", d);
+		printf("%4s %5d   %5d    %5d    %5d     ", d < 0 ? "this" : nb,
+		       dp->number, dp->major, dp->minor, dp->raid_disk);
+		wonly = dp->state & (1 << MD_DISK_WRITEMOSTLY);
+		failfast = dp->state & (1<<MD_DISK_FAILFAST);
+		dp->state &= ~(wonly | failfast);
+		if (dp->state & (1 << MD_DISK_FAULTY))
+			printf(" faulty");
+		if (dp->state & (1 << MD_DISK_ACTIVE))
+			printf(" active");
+		if (dp->state & (1 << MD_DISK_SYNC))
+			printf(" sync");
+		if (dp->state & (1 << MD_DISK_REMOVED))
+			printf(" removed");
+		if (wonly)
+			printf(" write-mostly");
+		if (failfast)
+			printf(" failfast");
+		if (dp->state == 0)
+			printf(" spare");
+		if ((dv = map_dev(dp->major, dp->minor, 0)))
+			printf("   %s", dv);
+		printf("\n");
+		if (d == -1)
+			printf("\n");
+	}
+}
+
+static void brief_examine_super0(struct supertype *st, int verbose)
+{
+	mdp_super_t *sb = st->sb;
+	char *c=map_num(pers, sb->level);
+	char devname[20];
+
+	sprintf(devname, "/dev/md%d", sb->md_minor);
+
+	if (verbose) {
+		printf("ARRAY %s level=%s num-devices=%d",
+		       devname,
+		       c?c:"-unknown-", sb->raid_disks);
+	} else
+		printf("ARRAY %s", devname);
+
+	if (sb->minor_version >= 90)
+		printf(" UUID=%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+		       sb->set_uuid2, sb->set_uuid3);
+	else
+		printf(" UUID=%08x", sb->set_uuid0);
+	printf("\n");
+}
+
+static void export_examine_super0(struct supertype *st)
+{
+	mdp_super_t *sb = st->sb;
+
+	printf("MD_LEVEL=%s\n", map_num(pers, sb->level));
+	printf("MD_DEVICES=%d\n", sb->raid_disks);
+	if (sb->minor_version >= 90)
+		printf("MD_UUID=%08x:%08x:%08x:%08x\n",
+		       sb->set_uuid0, sb->set_uuid1,
+		       sb->set_uuid2, sb->set_uuid3);
+	else
+		printf("MD_UUID=%08x\n", sb->set_uuid0);
+	printf("MD_UPDATE_TIME=%llu\n",
+	       __le64_to_cpu(sb->ctime) & 0xFFFFFFFFFFULL);
+	printf("MD_EVENTS=%llu\n",
+	       ((unsigned long long)sb->events_hi << 32)
+	       + sb->events_lo);
+}
+
+static int copy_metadata0(struct supertype *st, int from, int to)
+{
+	/* Read 64K from the appropriate offset of 'from'
+	 * and if it looks a little like a 0.90 superblock,
+	 * write it to the same offset of 'to'
+	 */
+	void *buf;
+	unsigned long long dsize, offset;
+	const int bufsize = 64*1024;
+	mdp_super_t *super;
+
+	if (posix_memalign(&buf, 4096, bufsize) != 0)
+		return 1;
+
+	if (!get_dev_size(from, NULL, &dsize))
+		goto err;
+
+	if (dsize < MD_RESERVED_SECTORS*512)
+		goto err;
+
+	offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+	offset *= 512;
+
+	if (lseek64(from, offset, 0) < 0LL)
+		goto err;
+	if (read(from, buf, bufsize) != bufsize)
+		goto err;
+
+	if (lseek64(to, offset, 0) < 0LL)
+		goto err;
+	super = buf;
+	if (super->md_magic != MD_SB_MAGIC ||
+	    super->major_version != 0 ||
+	    calc_sb0_csum(super) != super->sb_csum)
+		goto err;
+	if (write(to, buf, bufsize) != bufsize)
+		goto err;
+	free(buf);
+	return 0;
+err:
+	free(buf);
+	return 1;
+}
+
+static void detail_super0(struct supertype *st, char *homehost, char *subarray)
+{
+	mdp_super_t *sb = st->sb;
+	printf("              UUID : ");
+	if (sb->minor_version >= 90)
+		printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+		       sb->set_uuid2, sb->set_uuid3);
+	else
+		printf("%08x", sb->set_uuid0);
+	if (homehost) {
+		char buf[20];
+		void *hash = sha1_buffer(homehost,
+					 strlen(homehost),
+					 buf);
+		if (memcmp(&sb->set_uuid2, hash, 8)==0)
+			printf(" (local to host %s)", homehost);
+	}
+	printf("\n            Events : %d.%d\n\n", sb->events_hi, sb->events_lo);
+}
+
+static void brief_detail_super0(struct supertype *st, char *subarray)
+{
+	mdp_super_t *sb = st->sb;
+	printf(" UUID=");
+	if (sb->minor_version >= 90)
+		printf("%08x:%08x:%08x:%08x", sb->set_uuid0, sb->set_uuid1,
+		       sb->set_uuid2, sb->set_uuid3);
+	else
+		printf("%08x", sb->set_uuid0);
+}
+
+static int match_home0(struct supertype *st, char *homehost)
+{
+	mdp_super_t *sb = st->sb;
+	char buf[20];
+	char *hash;
+
+	if (!homehost)
+		return 0;
+	hash = sha1_buffer(homehost,
+			   strlen(homehost),
+			   buf);
+
+	return (memcmp(&sb->set_uuid2, hash, 8)==0);
+}
+
+static void uuid_from_super0(struct supertype *st, int uuid[4])
+{
+	mdp_super_t *super = st->sb;
+	uuid[0] = super->set_uuid0;
+	if (super->minor_version >= 90) {
+		uuid[1] = super->set_uuid1;
+		uuid[2] = super->set_uuid2;
+		uuid[3] = super->set_uuid3;
+	} else {
+		uuid[1] = 0;
+		uuid[2] = 0;
+		uuid[3] = 0;
+	}
+}
+
+static void getinfo_super0(struct supertype *st, struct mdinfo *info, char *map)
+{
+	mdp_super_t *sb = st->sb;
+	int working = 0;
+	int i;
+	int map_disks = info->array.raid_disks;
+
+	memset(info, 0, sizeof(*info));
+	info->array.major_version = sb->major_version;
+	info->array.minor_version = sb->minor_version;
+	info->array.patch_version = sb->patch_version;
+	info->array.raid_disks = sb->raid_disks;
+	info->array.level = sb->level;
+	info->array.layout = sb->layout;
+	info->array.md_minor = sb->md_minor;
+	info->array.ctime = sb->ctime;
+	info->array.utime = sb->utime;
+	info->array.chunk_size = sb->chunk_size;
+	info->array.state = sb->state;
+	info->component_size = sb->size;
+	info->component_size *= 2;
+
+	if (sb->state & (1<<MD_SB_BITMAP_PRESENT))
+		info->bitmap_offset = 8;
+
+	info->disk.state = sb->this_disk.state;
+	info->disk.major = sb->this_disk.major;
+	info->disk.minor = sb->this_disk.minor;
+	info->disk.raid_disk = sb->this_disk.raid_disk;
+	info->disk.number = sb->this_disk.number;
+
+	info->events = md_event(sb);
+	info->data_offset = 0;
+
+	sprintf(info->text_version, "0.%d", sb->minor_version);
+	info->safe_mode_delay = 200;
+
+	uuid_from_super0(st, info->uuid);
+
+	info->recovery_start = MaxSector;
+	if (sb->minor_version > 90 && (sb->reshape_position+1) != 0) {
+		info->reshape_active = 1;
+		info->reshape_progress = sb->reshape_position;
+		info->new_level = sb->new_level;
+		info->delta_disks = sb->delta_disks;
+		info->new_layout = sb->new_layout;
+		info->new_chunk = sb->new_chunk;
+		if (info->delta_disks < 0)
+			info->array.raid_disks -= info->delta_disks;
+	} else
+		info->reshape_active = 0;
+
+	info->recovery_blocked = info->reshape_active;
+
+	sprintf(info->name, "%d", sb->md_minor);
+	/* work_disks is calculated rather than read directly */
+	for (i=0; i < MD_SB_DISKS; i++)
+		if ((sb->disks[i].state & (1<<MD_DISK_SYNC)) &&
+		    (sb->disks[i].raid_disk < (unsigned)info->array.raid_disks) &&
+		    (sb->disks[i].state & (1<<MD_DISK_ACTIVE)) &&
+		    !(sb->disks[i].state & (1<<MD_DISK_FAULTY))) {
+			working ++;
+			if (map && i < map_disks)
+				map[i] = 1;
+		} else if (map && i < map_disks)
+			map[i] = 0;
+	info->array.working_disks = working;
+}
+
+static struct mdinfo *container_content0(struct supertype *st, char *subarray)
+{
+	struct mdinfo *info;
+
+	if (subarray)
+		return NULL;
+
+	info = xmalloc(sizeof(*info));
+	getinfo_super0(st, info, NULL);
+	return info;
+}
+
+static int update_super0(struct supertype *st, struct mdinfo *info,
+			 char *update,
+			 char *devname, int verbose,
+			 int uuid_set, char *homehost)
+{
+	/* NOTE: for 'assemble' and 'force' we need to return non-zero
+	 * if any change was made.  For others, the return value is
+	 * ignored.
+	 */
+	int rv = 0;
+	int uuid[4];
+	mdp_super_t *sb = st->sb;
+
+	if (strcmp(update, "homehost") == 0 &&
+	    homehost) {
+		/* note that 'homehost' is special as it is really
+		 * a "uuid" update.
+		 */
+		uuid_set = 0;
+		update = "uuid";
+		info->uuid[0] = sb->set_uuid0;
+		info->uuid[1] = sb->set_uuid1;
+	}
+
+	if (strcmp(update, "sparc2.2")==0 ) {
+		/* 2.2 sparc put the events in the wrong place
+		 * So we copy the tail of the superblock
+		 * up 4 bytes before continuing
+		 */
+		__u32 *sb32 = (__u32*)sb;
+
+		memmove(sb32+MD_SB_GENERIC_CONSTANT_WORDS+7,
+			sb32+MD_SB_GENERIC_CONSTANT_WORDS+7+1,
+			(MD_SB_WORDS - (MD_SB_GENERIC_CONSTANT_WORDS+7+1))*4);
+		if (verbose >= 0)
+			pr_err("adjusting superblock of %s for 2.2/sparc compatibility.\n",
+			       devname);
+	} else if (strcmp(update, "super-minor") ==0) {
+		sb->md_minor = info->array.md_minor;
+		if (verbose > 0)
+			pr_err("updating superblock of %s with minor number %d\n",
+				devname, info->array.md_minor);
+	} else if (strcmp(update, "summaries") == 0) {
+		unsigned int i;
+		/* set nr_disks, active_disks, working_disks,
+		 * failed_disks, spare_disks based on disks[]
+		 * array in superblock.
+		 * Also make sure extra slots aren't 'failed'
+		 */
+		sb->nr_disks = sb->active_disks =
+			sb->working_disks = sb->failed_disks =
+			sb->spare_disks = 0;
+		for (i=0; i < MD_SB_DISKS ; i++)
+			if (sb->disks[i].major ||
+			    sb->disks[i].minor) {
+				int state = sb->disks[i].state;
+				if (state & (1<<MD_DISK_REMOVED))
+					continue;
+				sb->nr_disks++;
+				if (state & (1<<MD_DISK_ACTIVE))
+					sb->active_disks++;
+				if (state & (1<<MD_DISK_FAULTY))
+					sb->failed_disks++;
+				else
+					sb->working_disks++;
+				if (state == 0)
+					sb->spare_disks++;
+			} else if (i >= sb->raid_disks && sb->disks[i].number == 0)
+				sb->disks[i].state = 0;
+	} else if (strcmp(update, "force-one")==0) {
+		/* Not enough devices for a working array, so
+		 * bring this one up-to-date.
+		 */
+		__u32 ehi = sb->events_hi, elo = sb->events_lo;
+		sb->events_hi = (info->events>>32) & 0xFFFFFFFF;
+		sb->events_lo = (info->events) & 0xFFFFFFFF;
+		if (sb->events_hi != ehi ||
+		    sb->events_lo != elo)
+			rv = 1;
+	} else if (strcmp(update, "force-array")==0) {
+		/* degraded array and 'force' requested, so
+		 * maybe need to mark it 'clean'
+		 */
+		if ((sb->level == 5 || sb->level == 4 || sb->level == 6) &&
+		    (sb->state & (1 << MD_SB_CLEAN)) == 0) {
+			/* need to force clean */
+			sb->state |= (1 << MD_SB_CLEAN);
+			rv = 1;
+		}
+	} else if (strcmp(update, "assemble")==0) {
+		int d = info->disk.number;
+		int wonly = sb->disks[d].state & (1<<MD_DISK_WRITEMOSTLY);
+		int failfast = sb->disks[d].state & (1<<MD_DISK_FAILFAST);
+		int mask = (1<<MD_DISK_WRITEMOSTLY)|(1<<MD_DISK_FAILFAST);
+		int add = 0;
+		if (sb->minor_version >= 91)
+			/* During reshape we don't insist on everything
+			 * being marked 'sync'
+			 */
+			add = (1<<MD_DISK_SYNC);
+		if (((sb->disks[d].state & ~mask) | add) !=
+		    (unsigned)info->disk.state) {
+			sb->disks[d].state = info->disk.state | wonly |failfast;
+			rv = 1;
+		}
+		if (info->reshape_active &&
+		    sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
+		    info->delta_disks >= 0 &&
+		    info->reshape_progress < sb->reshape_position) {
+			sb->reshape_position = info->reshape_progress;
+			rv = 1;
+		}
+		if (info->reshape_active &&
+		    sb->minor_version > 90 && (sb->reshape_position+1) != 0 &&
+		    info->delta_disks < 0 &&
+		    info->reshape_progress > sb->reshape_position) {
+			sb->reshape_position = info->reshape_progress;
+			rv = 1;
+		}
+	} else if (strcmp(update, "linear-grow-new") == 0) {
+		memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
+		sb->disks[info->disk.number].number = info->disk.number;
+		sb->disks[info->disk.number].major = info->disk.major;
+		sb->disks[info->disk.number].minor = info->disk.minor;
+		sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
+		sb->disks[info->disk.number].state = info->disk.state;
+		sb->this_disk = sb->disks[info->disk.number];
+	} else if (strcmp(update, "linear-grow-update") == 0) {
+		sb->raid_disks = info->array.raid_disks;
+		sb->nr_disks = info->array.nr_disks;
+		sb->active_disks = info->array.active_disks;
+		sb->working_disks = info->array.working_disks;
+		memset(&sb->disks[info->disk.number], 0, sizeof(sb->disks[0]));
+		sb->disks[info->disk.number].number = info->disk.number;
+		sb->disks[info->disk.number].major = info->disk.major;
+		sb->disks[info->disk.number].minor = info->disk.minor;
+		sb->disks[info->disk.number].raid_disk = info->disk.raid_disk;
+		sb->disks[info->disk.number].state = info->disk.state;
+	} else if (strcmp(update, "resync") == 0) {
+		/* make sure resync happens */
+		sb->state &= ~(1<<MD_SB_CLEAN);
+		sb->recovery_cp = 0;
+	} else if (strcmp(update, "uuid") == 0) {
+		if (!uuid_set && homehost) {
+			char buf[20];
+			char *hash = sha1_buffer(homehost,
+						 strlen(homehost),
+						 buf);
+			memcpy(info->uuid+2, hash, 8);
+		}
+		sb->set_uuid0 = info->uuid[0];
+		sb->set_uuid1 = info->uuid[1];
+		sb->set_uuid2 = info->uuid[2];
+		sb->set_uuid3 = info->uuid[3];
+		if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
+			struct bitmap_super_s *bm;
+			bm = (struct bitmap_super_s*)(sb+1);
+			uuid_from_super0(st, uuid);
+			memcpy(bm->uuid, uuid, 16);
+		}
+	} else if (strcmp(update, "metadata") == 0) {
+		/* Create some v1.0 metadata to match ours but make the
+		 * ctime bigger.  Also update info->array.*_version.
+		 * We need to arrange that store_super writes out
+		 * the v1.0 metadata.
+		 * Not permitted for unclean array, or array with
+		 * bitmap.
+		 */
+		if (info->bitmap_offset) {
+			pr_err("Cannot update metadata when bitmap is present\n");
+			rv = -2;
+		} else if (info->array.state != 1) {
+			pr_err("Cannot update metadata on unclean array\n");
+			rv = -2;
+		} else {
+			info->array.major_version = 1;
+			info->array.minor_version = 0;
+			uuid_from_super0(st, info->uuid);
+			st->other = super1_make_v0(st, info, st->sb);
+		}
+	} else if (strcmp(update, "revert-reshape") == 0) {
+		rv = -2;
+		if (sb->minor_version <= 90)
+			pr_err("No active reshape to revert on %s\n",
+			       devname);
+		else if (sb->delta_disks == 0)
+			pr_err("%s: Can only revert reshape which changes number of devices\n",
+			       devname);
+		else {
+			int tmp;
+			int parity = sb->level == 6 ? 2 : 1;
+			rv = 0;
+
+			if (sb->level >= 4 && sb->level <= 6 &&
+			    sb->reshape_position % (
+				    sb->new_chunk/512 *
+				    (sb->raid_disks - sb->delta_disks - parity))) {
+				pr_err("Reshape position is not suitably aligned.\n");
+				pr_err("Try normal assembly and stop again\n");
+				return -2;
+			}
+			sb->raid_disks -= sb->delta_disks;
+			sb->delta_disks = -sb->delta_disks;
+
+			tmp = sb->new_layout;
+			sb->new_layout = sb->layout;
+			sb->layout = tmp;
+
+			tmp = sb->new_chunk;
+			sb->new_chunk = sb->chunk_size;
+			sb->chunk_size = tmp;
+		}
+	} else if (strcmp(update, "no-bitmap") == 0) {
+		sb->state &= ~(1<<MD_SB_BITMAP_PRESENT);
+	} else if (strcmp(update, "_reshape_progress")==0)
+		sb->reshape_position = info->reshape_progress;
+	else if (strcmp(update, "writemostly")==0)
+		sb->state |= (1<<MD_DISK_WRITEMOSTLY);
+	else if (strcmp(update, "readwrite")==0)
+		sb->state &= ~(1<<MD_DISK_WRITEMOSTLY);
+	else
+		rv = -1;
+
+	sb->sb_csum = calc_sb0_csum(sb);
+	return rv;
+}
+
+/*
+ * For version-0 superblock, the homehost is 'stored' in the uuid.
+ * 8 bytes for a hash of the host leaving 8 bytes of random material.
+ * We use the first 8 bytes (64bits) of the sha1 of the host name
+ */
+static int init_super0(struct supertype *st, mdu_array_info_t *info,
+		       struct shape *s, char *ignored_name,
+		       char *homehost, int *uuid,
+		       unsigned long long data_offset)
+{
+	mdp_super_t *sb;
+	int spares;
+
+	if (data_offset != INVALID_SECTORS) {
+		pr_err("data-offset not support for 0.90\n");
+		return 0;
+	}
+
+	if (posix_memalign((void**)&sb, 4096,
+			   MD_SB_BYTES + ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
+		pr_err("could not allocate superblock\n");
+		return 0;
+	}
+	memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
+
+	st->sb = sb;
+	if (info == NULL) {
+		/* zeroing the superblock */
+		return 0;
+	}
+
+	spares = info->working_disks - info->active_disks;
+	if (info->raid_disks + spares  > MD_SB_DISKS) {
+		pr_err("too many devices requested: %d+%d > %d\n",
+			info->raid_disks , spares, MD_SB_DISKS);
+		return 0;
+	}
+
+	sb->md_magic = MD_SB_MAGIC;
+	sb->major_version = 0;
+	sb->minor_version = 90;
+	sb->patch_version = 0;
+	sb->gvalid_words = 0; /* ignored */
+	sb->ctime = time(0);
+	sb->level = info->level;
+	sb->size = s->size;
+	if (s->size != (unsigned long long)sb->size)
+		return 0;
+	sb->nr_disks = info->nr_disks;
+	sb->raid_disks = info->raid_disks;
+	sb->md_minor = info->md_minor;
+	sb->not_persistent = 0;
+	if (uuid) {
+		sb->set_uuid0 = uuid[0];
+		sb->set_uuid1 = uuid[1];
+		sb->set_uuid2 = uuid[2];
+		sb->set_uuid3 = uuid[3];
+	} else {
+		__u32 r[4];
+		random_uuid((__u8 *)r);
+		sb->set_uuid0 = r[0];
+		sb->set_uuid1 = r[1];
+		sb->set_uuid2 = r[2];
+		sb->set_uuid3 = r[3];
+	}
+	if (homehost && !uuid) {
+		char buf[20];
+		char *hash = sha1_buffer(homehost,
+					 strlen(homehost),
+					 buf);
+		memcpy(&sb->set_uuid2, hash, 8);
+	}
+
+	sb->utime = sb->ctime;
+	sb->state = info->state;
+	sb->active_disks = info->active_disks;
+	sb->working_disks = info->working_disks;
+	sb->failed_disks = info->failed_disks;
+	sb->spare_disks = info->spare_disks;
+	sb->events_hi = 0;
+	sb->events_lo = 1;
+
+	sb->layout = info->layout;
+	sb->chunk_size = info->chunk_size;
+
+	return 1;
+}
+
+struct devinfo {
+	int fd;
+	char *devname;
+	mdu_disk_info_t disk;
+	struct devinfo *next;
+};
+
+/* Add a device to the superblock being created */
+static int add_to_super0(struct supertype *st, mdu_disk_info_t *dinfo,
+			 int fd, char *devname, unsigned long long data_offset)
+{
+	mdp_super_t *sb = st->sb;
+	mdp_disk_t *dk = &sb->disks[dinfo->number];
+	struct devinfo *di, **dip;
+
+	dk->number = dinfo->number;
+	dk->major = dinfo->major;
+	dk->minor = dinfo->minor;
+	dk->raid_disk = dinfo->raid_disk;
+	dk->state = dinfo->state & ((1<<MD_DISK_ACTIVE) |
+				    (1<<MD_DISK_SYNC));
+
+	sb->this_disk = sb->disks[dinfo->number];
+	sb->sb_csum = calc_sb0_csum(sb);
+
+	dip = (struct devinfo **)&st->info;
+	while (*dip)
+		dip = &(*dip)->next;
+	di = xmalloc(sizeof(struct devinfo));
+	di->fd = fd;
+	di->devname = devname;
+	di->disk = *dinfo;
+	di->next = NULL;
+	*dip = di;
+
+	return 0;
+}
+
+static int store_super0(struct supertype *st, int fd)
+{
+	unsigned long long dsize;
+	unsigned long long offset;
+	mdp_super_t *super = st->sb;
+
+	if (!get_dev_size(fd, NULL, &dsize))
+		return 1;
+
+	if (dsize < MD_RESERVED_SECTORS*512)
+		return 2;
+
+	if (st->other) {
+		/* Writing out v1.0 metadata for --update=metadata */
+		int ret = 0;
+
+		offset = dsize/512 - 8*2;
+		offset &= ~(4*2-1);
+		offset *= 512;
+		if (lseek64(fd, offset, 0)< 0LL)
+			ret = 3;
+		else if (write(fd, st->other, 1024) != 1024)
+			ret = 4;
+		else
+			fsync(fd);
+		free(st->other);
+		st->other = NULL;
+		return ret;
+	}
+
+	offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+	offset *= 512;
+
+	if (lseek64(fd, offset, 0)< 0LL)
+		return 3;
+
+	if (write(fd, super, sizeof(*super)) != sizeof(*super))
+		return 4;
+
+	if (super->state & (1<<MD_SB_BITMAP_PRESENT)) {
+		struct bitmap_super_s * bm = (struct bitmap_super_s*)(super+1);
+		if (__le32_to_cpu(bm->magic) == BITMAP_MAGIC)
+			if (write(fd, bm, ROUND_UP(sizeof(*bm),4096)) !=
+			    ROUND_UP(sizeof(*bm),4096))
+			    return 5;
+	}
+
+	fsync(fd);
+	return 0;
+}
+
+static int write_init_super0(struct supertype *st)
+{
+	mdp_super_t *sb = st->sb;
+	int rv = 0;
+	struct devinfo *di;
+
+	for (di = st->info ; di && ! rv ; di = di->next) {
+
+		if (di->disk.state & (1 << MD_DISK_FAULTY))
+			continue;
+		if (di->fd == -1)
+			continue;
+		while (Kill(di->devname, NULL, 0, -1, 1) == 0)
+			;
+
+		sb->disks[di->disk.number].state &= ~(1<<MD_DISK_FAULTY);
+
+		sb->this_disk = sb->disks[di->disk.number];
+		sb->sb_csum = calc_sb0_csum(sb);
+		rv = store_super0(st, di->fd);
+
+		if (rv == 0 && (sb->state & (1<<MD_SB_BITMAP_PRESENT)))
+			rv = st->ss->write_bitmap(st, di->fd, NoUpdate);
+
+		if (rv)
+			pr_err("failed to write superblock to %s\n",
+			       di->devname);
+	}
+	return rv;
+}
+
+static int compare_super0(struct supertype *st, struct supertype *tst,
+			  int verbose)
+{
+	/*
+	 * return:
+	 *  0 same, or first was empty, and second was copied
+	 *  1 second had wrong number
+	 *  2 wrong uuid
+	 *  3 wrong other info
+	 */
+	mdp_super_t *first = st->sb;
+	mdp_super_t *second = tst->sb;
+	int uuid1[4], uuid2[4];
+
+	if (second->md_magic != MD_SB_MAGIC)
+		return 1;
+	if (!first) {
+		if (posix_memalign((void**)&first, 4096,
+			     MD_SB_BYTES +
+			     ROUND_UP(sizeof(struct bitmap_super_s), 4096)) != 0) {
+			pr_err("could not allocate superblock\n");
+			return 1;
+		}
+		memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
+		st->sb = first;
+		return 0;
+	}
+
+	uuid_from_super0(st, uuid1);
+	uuid_from_super0(tst, uuid2);
+	if (!same_uuid(uuid1, uuid2, 0))
+		return 2;
+	if (first->major_version != second->major_version ||
+	    first->minor_version != second->minor_version ||
+	    first->patch_version != second->patch_version ||
+	    first->gvalid_words  != second->gvalid_words  ||
+	    first->ctime         != second->ctime         ||
+	    first->level         != second->level         ||
+	    first->size          != second->size          ||
+	    first->raid_disks    != second->raid_disks    )
+		return 3;
+
+	return 0;
+}
+
+static void free_super0(struct supertype *st);
+
+static int load_super0(struct supertype *st, int fd, char *devname)
+{
+	/* try to read in the superblock
+	 * Return:
+	 *  0 on success
+	 *  1 on cannot get superblock
+	 *  2 on superblock meaningless
+	 */
+	unsigned long long dsize;
+	unsigned long long offset;
+	mdp_super_t *super;
+	int uuid[4];
+	struct bitmap_super_s *bsb;
+
+	free_super0(st);
+
+	if (!get_dev_size(fd, devname, &dsize))
+		return 1;
+
+	if (dsize < MD_RESERVED_SECTORS*512) {
+		if (devname)
+			pr_err("%s is too small for md: size is %llu sectors.\n",
+			       devname, dsize);
+		return 1;
+	}
+	st->devsize = dsize;
+
+	offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+	offset *= 512;
+
+	if (lseek64(fd, offset, 0)< 0LL) {
+		if (devname)
+			pr_err("Cannot seek to superblock on %s: %s\n",
+				devname, strerror(errno));
+		return 1;
+	}
+
+	if (posix_memalign((void**)&super, 4096,
+			   MD_SB_BYTES +
+			   ROUND_UP(sizeof(bitmap_super_t), 4096)) != 0) {
+		pr_err("could not allocate superblock\n");
+		return 1;
+	}
+
+	if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
+		if (devname)
+			pr_err("Cannot read superblock on %s\n",
+				devname);
+		free(super);
+		return 1;
+	}
+
+	if (st->ss && st->minor_version == 9)
+		super0_swap_endian(super);
+
+	if (super->md_magic != MD_SB_MAGIC) {
+		if (devname)
+			pr_err("No super block found on %s (Expected magic %08x, got %08x)\n",
+				devname, MD_SB_MAGIC, super->md_magic);
+		free(super);
+		return 2;
+	}
+
+	if (super->major_version != 0) {
+		if (devname)
+			pr_err("Cannot interpret superblock on %s - version is %d\n",
+				devname, super->major_version);
+		free(super);
+		return 2;
+	}
+	st->sb = super;
+
+	if (st->ss == NULL) {
+		st->ss = &super0;
+		st->minor_version = super->minor_version;
+		st->max_devs = MD_SB_DISKS;
+		st->info = NULL;
+	}
+
+	/* Now check on the bitmap superblock */
+	if ((super->state & (1<<MD_SB_BITMAP_PRESENT)) == 0)
+		return 0;
+	/* Read the bitmap superblock and make sure it looks
+	 * valid.  If it doesn't clear the bit.  An --assemble --force
+	 * should get that written out.
+	 */
+	if (read(fd, super+1, ROUND_UP(sizeof(struct bitmap_super_s),4096)) !=
+	    ROUND_UP(sizeof(struct bitmap_super_s), 4096))
+		goto no_bitmap;
+
+	uuid_from_super0(st, uuid);
+	bsb = (struct bitmap_super_s *)(super+1);
+	if (__le32_to_cpu(bsb->magic) != BITMAP_MAGIC ||
+	    memcmp(bsb->uuid, uuid, 16) != 0)
+		goto no_bitmap;
+	return 0;
+
+ no_bitmap:
+	super->state &= ~(1<<MD_SB_BITMAP_PRESENT);
+
+	return 0;
+}
+
+static struct supertype *match_metadata_desc0(char *arg)
+{
+	struct supertype *st = xcalloc(1, sizeof(*st));
+
+	st->container_devnm[0] = 0;
+	st->ss = &super0;
+	st->info = NULL;
+	st->minor_version = 90;
+	st->max_devs = MD_SB_DISKS;
+	st->sb = NULL;
+	/* we sometimes get 00.90 */
+	while (arg[0] == '0' && arg[1] == '0')
+		arg++;
+	if (strcmp(arg, "0") == 0 ||
+#ifdef DEFAULT_OLD_METADATA /* ifndef in super1.c */
+	    strcmp(arg, "default") == 0 ||
+#endif /* DEFAULT_OLD_METADATA */
+	    strcmp(arg, "0.90") == 0 ||
+	    strcmp(arg, "") == 0 /* no metadata  - i.e. non_persistent */
+		)
+		return st;
+
+	st->minor_version = 91; /* reshape in progress */
+	if (strcmp(arg, "0.91") == 0) /* For dup_super support */
+		return st;
+
+	st->minor_version = 9; /* flag for 'byte-swapped' */
+	if (strcmp(arg, "0.swap")==0 ||
+	    strcmp(arg, "0.9") == 0) /* For dup_super support */
+		return st;
+
+	free(st);
+	return NULL;
+}
+
+static __u64 avail_size0(struct supertype *st, __u64 devsize,
+			 unsigned long long data_offset)
+{
+	if (data_offset != 0 && data_offset != INVALID_SECTORS)
+		return 0ULL;
+	if (devsize < MD_RESERVED_SECTORS)
+		return 0ULL;
+	return MD_NEW_SIZE_SECTORS(devsize);
+}
+
+static int add_internal_bitmap0(struct supertype *st, int *chunkp,
+				int delay, int write_behind,
+				unsigned long long size, int may_change,
+				int major)
+{
+	/*
+	 * The bitmap comes immediately after the superblock and must be 60K in size
+	 * at most.  The default size is between 30K and 60K
+	 *
+	 * size is in sectors,  chunk is in bytes !!!
+	 */
+	unsigned long long bits;
+	unsigned long long max_bits = (60*1024 - sizeof(bitmap_super_t))*8;
+	unsigned long long min_chunk;
+	int chunk = *chunkp;
+	mdp_super_t *sb = st->sb;
+	bitmap_super_t *bms = (bitmap_super_t*)(((char*)sb) + MD_SB_BYTES);
+	int uuid[4];
+
+	min_chunk = 4096; /* sub-page chunks don't work yet.. */
+	bits = (size * 512) / min_chunk + 1;
+	while (bits > max_bits) {
+		min_chunk *= 2;
+		bits = (bits+1)/2;
+	}
+	if (chunk == UnSet) {
+		/* A chunk size less than a few Megabytes gives poor
+		 * performance without increasing resync noticeably
+		 */
+		chunk = min_chunk;
+		if (chunk < 64*1024*1024)
+			chunk = 64*1024*1024;
+	} else if ((unsigned long long)chunk < min_chunk)
+		return -EINVAL; /* chunk size too small */
+
+	sb->state |= (1<<MD_SB_BITMAP_PRESENT);
+
+	memset(bms, 0, sizeof(*bms));
+	bms->magic = __cpu_to_le32(BITMAP_MAGIC);
+	bms->version = __cpu_to_le32(major);
+	uuid_from_super0(st, uuid);
+	memcpy(bms->uuid, uuid, 16);
+	bms->chunksize = __cpu_to_le32(chunk);
+	bms->daemon_sleep = __cpu_to_le32(delay);
+	bms->sync_size = __cpu_to_le64(size);
+	bms->write_behind = __cpu_to_le32(write_behind);
+	*chunkp = chunk;
+	return 0;
+}
+
+static int locate_bitmap0(struct supertype *st, int fd, int node_num)
+{
+	unsigned long long dsize;
+	unsigned long long offset;
+
+	if (!get_dev_size(fd, NULL, &dsize))
+		return -1;
+
+	if (dsize < MD_RESERVED_SECTORS*512)
+		return -1;
+
+	offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+	offset *= 512;
+
+	offset += MD_SB_BYTES;
+
+	lseek64(fd, offset, 0);
+	return 0;
+}
+
+static int write_bitmap0(struct supertype *st, int fd, enum bitmap_update update)
+{
+	unsigned long long dsize;
+	unsigned long long offset;
+	mdp_super_t *sb = st->sb;
+
+	int rv = 0;
+
+	int towrite, n;
+	void *buf;
+
+	if (!get_dev_size(fd, NULL, &dsize))
+		return 1;
+
+	if (dsize < MD_RESERVED_SECTORS*512)
+		return -1;
+
+	offset = MD_NEW_SIZE_SECTORS(dsize>>9);
+
+	offset *= 512;
+
+	if (lseek64(fd, offset + 4096, 0)< 0LL)
+		return 3;
+
+	if (posix_memalign(&buf, 4096, 4096))
+		return -ENOMEM;
+
+	memset(buf, 0xff, 4096);
+	memcpy(buf,  ((char*)sb)+MD_SB_BYTES, sizeof(bitmap_super_t));
+	towrite = 60*1024;
+	while (towrite > 0) {
+		n = towrite;
+		if (n > 4096)
+			n = 4096;
+		n = write(fd, buf, n);
+		if (n > 0)
+			towrite -= n;
+		else
+			break;
+		memset(buf, 0xff, 4096);
+	}
+	fsync(fd);
+	if (towrite)
+		rv = -2;
+
+	free(buf);
+	return rv;
+}
+
+static void free_super0(struct supertype *st)
+{
+	if (st->sb)
+		free(st->sb);
+	while (st->info) {
+		struct devinfo *di = st->info;
+		st->info = di->next;
+		if (di->fd >= 0)
+			close(di->fd);
+		free(di);
+	}
+	st->sb = NULL;
+}
+
+static int validate_geometry0(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)
+{
+	unsigned long long ldsize;
+	int fd;
+	unsigned int tbmax = 4;
+
+	/* prior to linux 3.1, a but limits usable device size to 2TB.
+	 * It was introduced in 2.6.29, but we won't worry about that detail
+	 */
+	if (get_linux_version() < 3001000)
+		tbmax = 2;
+
+	if (level == LEVEL_CONTAINER) {
+		if (verbose)
+			pr_err("0.90 metadata does not support containers\n");
+		return 0;
+	}
+	if (raiddisks > MD_SB_DISKS) {
+		if (verbose)
+			pr_err("0.90 metadata supports at most %d devices per array\n",
+				MD_SB_DISKS);
+		return 0;
+	}
+	if (size >= tbmax * 2ULL*1024*1024*1024) {
+		if (verbose)
+			pr_err("0.90 metadata supports at most %d terabytes per device\n", tbmax);
+		return 0;
+	}
+	if (*chunk == UnSet)
+		*chunk = DEFAULT_CHUNK;
+
+	if (level == 0 && layout != UnSet) {
+		if (verbose)
+			pr_err("0.90 metadata does not support layouts for RAID0\n");
+		return 0;
+	}
+
+	if (!subdev)
+		return 1;
+
+	fd = open(subdev, O_RDONLY|O_EXCL, 0);
+	if (fd < 0) {
+		if (verbose)
+			pr_err("super0.90 cannot open %s: %s\n",
+				subdev, strerror(errno));
+		return 0;
+	}
+
+	if (!get_dev_size(fd, subdev, &ldsize)) {
+		close(fd);
+		return 0;
+	}
+	close(fd);
+
+	if (ldsize < MD_RESERVED_SECTORS * 512)
+		return 0;
+	*freesize = MD_NEW_SIZE_SECTORS(ldsize >> 9);
+	return 1;
+}
+
+struct superswitch super0 = {
+	.examine_super = examine_super0,
+	.brief_examine_super = brief_examine_super0,
+	.export_examine_super = export_examine_super0,
+	.detail_super = detail_super0,
+	.brief_detail_super = brief_detail_super0,
+	.write_init_super = write_init_super0,
+	.validate_geometry = validate_geometry0,
+	.add_to_super = add_to_super0,
+	.copy_metadata = copy_metadata0,
+	.match_home = match_home0,
+	.uuid_from_super = uuid_from_super0,
+	.getinfo_super = getinfo_super0,
+	.container_content = container_content0,
+	.update_super = update_super0,
+	.init_super = init_super0,
+	.store_super = store_super0,
+	.compare_super = compare_super0,
+	.load_super = load_super0,
+	.match_metadata_desc = match_metadata_desc0,
+	.avail_size = avail_size0,
+	.add_internal_bitmap = add_internal_bitmap0,
+	.locate_bitmap = locate_bitmap0,
+	.write_bitmap = write_bitmap0,
+	.free_super = free_super0,
+	.name = "0.90",
+};