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Allow tools to use direct IO on Linux when reading from the device, if teh device supports it, and if the tools is OK with that (most are).  Mainly for xfs_repair speedups, now that libxfs caches metadata buffers internally.
Merge of master-melb:xfs-cmds:26728a by kenmcd.

/*
 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it would 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 the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <libxfs.h>
#include <libxlog.h>
#include "agheader.h"
#include "globals.h"
#include "protos.h"
#include "err_protos.h"

#define BSIZE	(1024 * 1024)

#define XFS_AG_BYTES(bblog)	((long long)BBSIZE << (bblog))
#define	XFS_AG_MIN_BYTES	((XFS_AG_BYTES(15)))	/* 16 MB */

/*
 * copy the fields of a superblock that are present in primary and
 * secondaries -- preserve fields that are different in the primary.
 */
void
copy_sb(xfs_sb_t *source, xfs_sb_t *dest)
{
	xfs_ino_t	rootino;
	xfs_ino_t	rbmino;
	xfs_ino_t	rsumino;
	xfs_ino_t	uquotino;
	xfs_ino_t	gquotino;
	__uint16_t	versionnum;

	rootino = dest->sb_rootino;
	rbmino = dest->sb_rbmino;
	rsumino = dest->sb_rsumino;
	uquotino = dest->sb_uquotino;
	gquotino = dest->sb_gquotino;

	versionnum = dest->sb_versionnum;

	*dest = *source;

	dest->sb_rootino = rootino;
	dest->sb_rbmino = rbmino;
	dest->sb_rsumino = rsumino;
	dest->sb_uquotino = uquotino;
	dest->sb_gquotino = gquotino;

	dest->sb_versionnum = versionnum;

	/*
	 * copy over version bits that are stamped into all
	 * secondaries and cannot be changed at run time in
	 * the primary superblock
	 */
	if (XFS_SB_VERSION_HASDALIGN(source))
		XFS_SB_VERSION_ADDDALIGN(dest);
	if (XFS_SB_VERSION_HASEXTFLGBIT(source))
		XFS_SB_VERSION_ADDEXTFLGBIT(dest);

	/*
	 * these are all supposed to be zero or will get reset anyway
	 */
	dest->sb_icount = 0;
	dest->sb_ifree = 0;
	dest->sb_fdblocks = 0;
	dest->sb_frextents = 0;

	bzero(source->sb_fname, 12);
}

/*
 * find a secondary superblock, copy it into the sb buffer
 */
int
find_secondary_sb(xfs_sb_t *rsb)
{
	xfs_off_t	off;
	xfs_sb_t	*sb;
	xfs_sb_t	bufsb;
	char		*c_bufsb;
	int		done;
	int		i;
	int		dirty;
	int		retval;
	int		bsize;

	do_warn(_("\nattempting to find secondary superblock...\n"));

	sb = (xfs_sb_t *)memalign(libxfs_device_alignment(), BSIZE);
	if (!sb) {
		do_error(
	_("error finding secondary superblock -- failed to memalign buffer\n"));
		exit(1);
	}

	bzero(&bufsb, sizeof(xfs_sb_t));
	retval = 0;
	dirty = 0;
	bsize = 0;

	/*
	 * skip first sector since we know that's bad
	 */
	for (done = 0, off = XFS_AG_MIN_BYTES; !done ; off += bsize)  {
		/*
		 * read disk 1 MByte at a time.
		 */
		if (lseek64(x.dfd, off, SEEK_SET) != off)  {
			done = 1;
		}

		if (!done && (bsize = read(x.dfd, sb, BSIZE)) == 0)  {
			done = 1;
		}

		do_warn(".");

		/*
		 * check the buffer 512 bytes at a time since
		 * we don't know how big the sectors really are.
		 */
		for (i = 0; !done && i < bsize; i += BBSIZE)  {
			c_bufsb = (char *) sb + i;
			libxfs_xlate_sb(c_bufsb, &bufsb, 1, XFS_SB_ALL_BITS);

			if (verify_sb(&bufsb, 0) != XR_OK)
				continue;

			do_warn(_("found candidate secondary superblock...\n"));

			/*
			 * found one.  now verify it by looking
			 * for other secondaries.
			 */
			bcopy(&bufsb, rsb, sizeof(xfs_sb_t));
			rsb->sb_inprogress = 0;
			clear_sunit = 1;

			if (verify_set_primary_sb(rsb, 0, &dirty) == XR_OK)  {
				do_warn(
			_("verified secondary superblock...\n"));
				done = 1;
				retval = 1;
			} else  {
				do_warn(
			_("unable to verify superblock, continuing...\n"));
			}
		}
	}

	free(sb);
	return(retval);
}

/*
 * calculate what inode alignment field ought to be
 * based on internal superblock info
 */
int
calc_ino_align(xfs_sb_t *sb)
{
	xfs_extlen_t align;

	align = XFS_INODE_BIG_CLUSTER_SIZE >> sb->sb_blocklog;

	return(align);
}

/*
 * verify a superblock -- does not verify root inode #
 *	can only check that geometry info is internally
 *	consistent.  because of growfs, that's no guarantee
 *	of correctness (e.g. geometry may have changed)
 *
 * fields verified or consistency checked:
 *
 *			sb_magicnum
 *
 *			sb_versionnum
 *
 *			sb_inprogress
 *
 *			sb_blocksize	(as a group)
 *			sb_blocklog
 *
 * geometry info -	sb_dblocks	(as a group)
 *			sb_agcount
 *			sb_agblocks
 *			sb_agblklog
 *
 * inode info -		sb_inodesize	(x-checked with geo info)
 *			sb_inopblock
 *
 * sector size info -
 *			sb_sectsize
 *			sb_sectlog
 *			sb_logsectsize
 *			sb_logsectlog
 *
 * not checked here -
 *			sb_rootino
 *			sb_fname
 *			sb_fpack
 *			sb_logstart
 *			sb_uuid
 *
 *			ALL real-time fields
 *			final 4 summary counters
 */

int
verify_sb(xfs_sb_t *sb, int is_primary_sb)
{
	__uint32_t	bsize;
	xfs_extlen_t	align;
	int		i;

	/* check magic number and version number */

	if (sb->sb_magicnum != XFS_SB_MAGIC)
		return(XR_BAD_MAGIC);

	if (!XFS_SB_GOOD_VERSION(sb))
		return(XR_BAD_VERSION);

	/* does sb think mkfs really finished ? */

	if (is_primary_sb && sb->sb_inprogress == 1)
		return(XR_BAD_INPROGRESS);

	/* check to make sure blocksize is legal 2^N, 9 <= N <= 16 */

	if (sb->sb_blocksize == 0)
		return(XR_BAD_BLOCKSIZE);

	bsize = 1;

	for (i = 0; bsize < sb->sb_blocksize &&
		i < sizeof(sb->sb_blocksize) * NBBY; i++)
		bsize <<= 1;

	if (i < XFS_MIN_BLOCKSIZE_LOG || i > XFS_MAX_BLOCKSIZE_LOG)
		return(XR_BAD_BLOCKSIZE);

	/* check sb blocksize field against sb blocklog field */

	if (i != sb->sb_blocklog)
		return(XR_BAD_BLOCKLOG);

	/* sanity check ag count, size fields against data size field */

	if (sb->sb_dblocks == 0 ||
		sb->sb_dblocks >
			((__uint64_t)sb->sb_agcount * sb->sb_agblocks) ||
		sb->sb_dblocks <
			((__uint64_t)(sb->sb_agcount - 1) * sb->sb_agblocks
			+ XFS_MIN_AG_BLOCKS))
		return(XR_BAD_FS_SIZE_DATA);

	if (sb->sb_agblklog != (__uint8_t)libxfs_log2_roundup(sb->sb_agblocks))
		return(XR_BAD_FS_SIZE_DATA);

	if (sb->sb_inodesize < XFS_DINODE_MIN_SIZE ||
		sb->sb_inodesize > XFS_DINODE_MAX_SIZE ||
		sb->sb_inopblock != howmany(sb->sb_blocksize,sb->sb_inodesize))
		return(XR_BAD_INO_SIZE_DATA);

	/* check to make sure sectorsize is legal 2^N, 9 <= N <= 15 */

	if (sb->sb_sectsize == 0)
		return(XR_BAD_SECT_SIZE_DATA);

	bsize = 1;

	for (i = 0; bsize < sb->sb_sectsize &&
		i < sizeof(sb->sb_sectsize) * NBBY; i++)  {
		bsize <<= 1;
	}

	if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG)
		return(XR_BAD_SECT_SIZE_DATA);

	/* check sb sectorsize field against sb sectlog field */

	if (i != sb->sb_sectlog)
		return(XR_BAD_SECT_SIZE_DATA);

	if (XFS_SB_VERSION_HASSECTOR(sb))  {

		/* check to make sure log sector is legal 2^N, 9 <= N <= 15 */

		if (sb->sb_logsectsize == 0)
			return(XR_BAD_SECT_SIZE_DATA);

		bsize = 1;

		for (i = 0; bsize < sb->sb_logsectsize &&
			i < sizeof(sb->sb_logsectsize) * NBBY; i++)  {
			bsize <<= 1;
		}

		if (i < XFS_MIN_SECTORSIZE_LOG || i > XFS_MAX_SECTORSIZE_LOG)
			return(XR_BAD_SECT_SIZE_DATA);

		/* check sb log sectorsize field against sb log sectlog field */

		if (i != sb->sb_logsectlog)
			return(XR_BAD_SECT_SIZE_DATA);
	}

	/*
	 * real-time extent size is always set
	 */
	if (sb->sb_rextsize * sb->sb_blocksize > XFS_MAX_RTEXTSIZE)
		return(XR_BAD_RT_GEO_DATA);

	if (sb->sb_rextsize * sb->sb_blocksize < XFS_MIN_RTEXTSIZE)
			return(XR_BAD_RT_GEO_DATA);

	if (sb->sb_rblocks == 0)  {
		if (sb->sb_rextents != 0)
			return(XR_BAD_RT_GEO_DATA);

		if (sb->sb_rbmblocks != 0)
			return(XR_BAD_RT_GEO_DATA);

		if (sb->sb_rextslog != 0)
			return(XR_BAD_RT_GEO_DATA);

		if (sb->sb_frextents != 0)
			return(XR_BAD_RT_GEO_DATA);
	} else  {
		/*
		 * if we have a real-time partition, sanity-check geometry
		 */
		if (sb->sb_rblocks / sb->sb_rextsize != sb->sb_rextents)
			return(XR_BAD_RT_GEO_DATA);

		if (sb->sb_rextslog !=
				libxfs_highbit32((unsigned int)sb->sb_rextents))
			return(XR_BAD_RT_GEO_DATA);

		if (sb->sb_rbmblocks != (xfs_extlen_t) howmany(sb->sb_rextents,
						NBBY * sb->sb_blocksize))
			return(XR_BAD_RT_GEO_DATA);
	}

	/*
	 * verify correctness of inode alignment if it's there
	 */
	if (XFS_SB_VERSION_HASALIGN(sb))  {
		align = calc_ino_align(sb);

		if (align != sb->sb_inoalignmt)
			return(XR_BAD_INO_ALIGN);
	}

	/*
	 * verify max. % of inodes (sb_imax_pct)
	 */
	if (sb->sb_imax_pct > 100)
		return(XR_BAD_INO_MAX_PCT);

	/*
	 * verify stripe alignment fields if present
	 */
	if (XFS_SB_VERSION_HASDALIGN(sb)) {
		if ((!sb->sb_unit && sb->sb_width) ||
		    (sb->sb_unit && sb->sb_agblocks % sb->sb_unit))
			return(XR_BAD_SB_UNIT);
		if ((sb->sb_unit && !sb->sb_width) ||
		    (sb->sb_width && sb->sb_unit && sb->sb_width % sb->sb_unit))
			return(XR_BAD_SB_WIDTH);
	}

	/*
	 * if shared bit is set, verify that the version number is sane
	 */
	if (XFS_SB_VERSION_HASSHARED(sb))  {
		if (sb->sb_shared_vn > XFS_SB_MAX_SHARED_VN)
			return(XR_BAD_SVN);
	}

	/*
	 * mkfs's that stamped a feature bit besides the ones in the
	 * mask below could leave garbage in the secondary superblock
	 * sectors.  Anything stamping the shared fs bit or better into
	 * the secondaries is ok and should generate clean secondary
	 * superblock sectors.
	 *
	 * check primary and clean secondary superblocks more strictly
	 */
	if (is_primary_sb || sb->sb_versionnum & XR_PART_SECSB_VNMASK)  {
		/*
		 * return errors if shared vn or alignment fields
		 * are set without their feature bits being set
		 */
		if ((!pre_65_beta && (sb->sb_versionnum & XR_PART_SECSB_VNMASK)) ||
		    (pre_65_beta && (sb->sb_versionnum & XR_ALPHA_SECSB_VNMASK))) {
			/*
			 * shared version # and inode alignment fields
			 * should be valid
			 */
			if (sb->sb_shared_vn && !XFS_SB_VERSION_HASSHARED(sb))
				return(XR_BAD_SVN);
			if (sb->sb_inoalignmt && !XFS_SB_VERSION_HASALIGN(sb))
				return(XR_BAD_INO_ALIGN);
		}
		if ((!pre_65_beta &&
		     (sb->sb_versionnum & XR_GOOD_SECSB_VNMASK)) ||
		    (pre_65_beta &&
		     (sb->sb_versionnum & XFS_SB_VERSION_DALIGNBIT)))  {
			/*
			 * stripe alignment values should be valid
			 */
			if (sb->sb_unit && !XFS_SB_VERSION_HASDALIGN(sb))
				return(XR_BAD_SB_UNIT);
			if (sb->sb_width && !XFS_SB_VERSION_HASDALIGN(sb))
				return(XR_BAD_SB_WIDTH);
		}

#if 0
		/*
		 * checks involving later superblock fields get added here...
		 */
		if (sb->sb_versionnum & XR_GOOD_SECSB_VNMASK)  {
		}
#endif
	}

	return(XR_OK);
}

void
write_primary_sb(xfs_sb_t *sbp, int size)
{
	void *buf;

	if (no_modify)
		return;

	if ((buf = memalign(libxfs_device_alignment(), size)) == NULL) {
		do_error(_("failed to memalign superblock buffer\n"));
		return;
	}
	memset(buf, 0, size);

	if (lseek64(x.dfd, 0LL, SEEK_SET) != 0LL) {
		free(buf);
		do_error(_("couldn't seek to offset 0 in filesystem\n"));
	}

	libxfs_xlate_sb(buf, sbp, -1, XFS_SB_ALL_BITS);

	if (write(x.dfd, buf, size) != size) {
		free(buf);
		do_error(_("primary superblock write failed!\n"));
	}

	free(buf);
}

/*
 * get a possible superblock -- don't check for internal consistency
 */
int
get_sb(xfs_sb_t *sbp, xfs_off_t off, int size, xfs_agnumber_t agno)
{
	int error, rval;
	void *buf;

	if ((buf = memalign(libxfs_device_alignment(), size)) == NULL) {
		do_error(
	_("error reading superblock %u -- failed to memalign buffer\n"),
			agno, off);
		exit(1);
	}
	memset(buf, 0, size);

	/* try and read it first */

	if (lseek64(x.dfd, off, SEEK_SET) != off)  {
		do_warn(
	_("error reading superblock %u -- seek to offset %lld failed\n"),
			agno, off);
		return(XR_EOF);
	}

	if ((rval = read(x.dfd, buf, size)) != size)  {
		error = errno;
		do_warn(
	_("superblock read failed, offset %lld, size %d, ag %u, rval %d\n"),
			off, size, agno, rval);
		do_error("%s\n", strerror(error));
	}
	libxfs_xlate_sb(buf, sbp, 1, XFS_SB_ALL_BITS);
	free(buf);

	return (verify_sb(sbp, 0));
}

/* returns element on list with highest reference count */

fs_geo_list_t *
get_best_geo(fs_geo_list_t *list)
{
	int cnt = 0;
	fs_geo_list_t *current, *rval = NULL;

	current = list;

	while (current != NULL)  {
		if (current->refs > cnt)  {
			rval = current;
			cnt = current->refs;
		}
		current = current->next;
	}

	return(rval);
}

/* adds geometry info to linked list.  returns (sometimes new) head of list */

fs_geo_list_t *
add_geo(fs_geo_list_t *list, fs_geometry_t *geo_p, int index)
{
	fs_geo_list_t	*current = list;

	while (current != NULL)  {
		if (memcmp(geo_p, &current->geo, sizeof(fs_geometry_t)) == 0)  {
			current->refs++;
			return(list);
		}

		current = current->next;
	}

	if ((current = malloc(sizeof(fs_geo_list_t))) == NULL) {
		do_error(_("couldn't malloc geometry structure\n"));
		exit(1);
	}

	current->geo = *geo_p;
	current->refs = 1;
	current->next = list;
	current->index = index;

	return(current);
}

void
free_geo(fs_geo_list_t *list)
{
	fs_geo_list_t	*next;
	fs_geo_list_t	*current;

	current = list;

	for (current = list; current != NULL; current = next)  {
		next = current->next;
		free(current);
	}
}

void
get_sb_geometry(fs_geometry_t *geo, xfs_sb_t *sbp)
{
	bzero(geo, sizeof(fs_geometry_t));

	/*
	 * blindly set fields that we know are always good
	 */
	geo->sb_blocksize = sbp->sb_blocksize;
	geo->sb_dblocks = sbp->sb_dblocks;
	geo->sb_rblocks = sbp->sb_rblocks;
	geo->sb_rextents = sbp->sb_rextents;
	geo->sb_logstart = sbp->sb_logstart;
	geo->sb_rextsize = sbp->sb_rextsize;
	geo->sb_agblocks = sbp->sb_agblocks;
	geo->sb_agcount = sbp->sb_agcount;
	geo->sb_rbmblocks = sbp->sb_rbmblocks;
	geo->sb_logblocks = sbp->sb_logblocks;
	geo->sb_sectsize = sbp->sb_sectsize;
	geo->sb_inodesize = sbp->sb_inodesize;

	if (XFS_SB_VERSION_HASALIGN(sbp))
		geo->sb_ialignbit = 1;

	if (XFS_SB_VERSION_HASSHARED(sbp) ||
	    sbp->sb_versionnum & XR_PART_SECSB_VNMASK)
		geo->sb_sharedbit = 1;

	if (XFS_SB_VERSION_HASDALIGN(sbp))
		geo->sb_salignbit = 1;

	if (XFS_SB_VERSION_HASEXTFLGBIT(sbp))
		geo->sb_extflgbit = 1;

	/*
	 * protect against pre-6.5 mkfs-generated garbaged
	 * fields in the secondary superblocks.  pay attention
	 * to those fields if and only if their corresponding
	 * feature bits are set in the feature bits of the
	 * version number or we can deduce from the version bits
	 * that are set that our field was properly initialized
	 * because a field after the field we care about was
	 * properly initialized as well.
	 */

	/*
	 * inode alignment field lives before the data alignment field
	 */
	if ((!pre_65_beta && (sbp->sb_versionnum & XR_PART_SECSB_VNMASK)) ||
	    (pre_65_beta && (sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK)))
		geo->sb_inoalignmt = sbp->sb_inoalignmt;

	if ((!pre_65_beta && (sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK)) ||
	    (pre_65_beta && XFS_SB_VERSION_HASDALIGN(sbp))) {
		geo->sb_unit = sbp->sb_unit;
		geo->sb_width = sbp->sb_width;
	}

	/*
	 * shared vn always set if either ino or data alignment is on
	 * since that field lives between the quota and inode alignment
	 * fields
	 */
	if (sbp->sb_versionnum & XR_PART_SECSB_VNMASK)
		geo->sb_shared_vn = sbp->sb_shared_vn;

	/*
	 * superblock fields located after sb_widthfields get set
	 * into the geometry structure only if we can determine
	 * from the features enabled in this superblock whether
	 * or not the sector was bzero'd at mkfs time.
	 */
	if ((!pre_65_beta && (sbp->sb_versionnum & XR_GOOD_SECSB_VNMASK)) ||
	    (pre_65_beta && (sbp->sb_versionnum & XR_ALPHA_SECSB_VNMASK))) {
		geo->sb_fully_zeroed = 1;
	}
}

/*
 * the way to verify that a primary sb is consistent with the
 * filesystem is find the secondaries given the info in the
 * primary and compare the geometries in the secondaries against
 * the geometry indicated by the primary.
 *
 * returns 1 if bad, 0 if ok
 */
int
verify_set_primary_sb(xfs_sb_t		*rsb,
			int		sb_index,
			int		*sb_modified)
{
	xfs_off_t	off;
	fs_geometry_t	geo;
	xfs_sb_t	*sb;
	fs_geo_list_t	*list;
	fs_geo_list_t	*current;
	char		*checked;
	xfs_agnumber_t	agno;
	int		num_sbs;
	int		skip;
	int		size;
	int		num_ok;
	int		retval;
	int		round;

	/*
	 * select the number of secondaries to try for
	 */
	num_sbs = MIN(NUM_SBS, rsb->sb_agcount);
	skip = howmany(num_sbs, rsb->sb_agcount);
	size = NUM_AGH_SECTS * rsb->sb_sectsize;
	retval = 0;
	list = NULL;
	num_ok = 0;
	*sb_modified = 0;

	sb = (xfs_sb_t *) alloc_ag_buf(size);
	checked = calloc(rsb->sb_agcount, sizeof(char));
	if (!checked) {
		do_error(_("calloc failed in verify_set_primary_sb\n"));
		exit(1);
	}

	/*
	 * put the primary sb geometry info onto the geometry list
	 */
	checked[sb_index] = 1;
	get_sb_geometry(&geo, rsb);
	list = add_geo(list, &geo, sb_index);

	/*
	 * grab N secondaries.  check them off as we get them
	 * so we only process each one once
	 */
	for (round = 0; round < skip; round++)  {
		for (agno = round; agno < rsb->sb_agcount; agno += skip)  {
			if (checked[agno])
				continue;

			off = (xfs_off_t)agno * rsb->sb_agblocks << rsb->sb_blocklog;

			checked[agno] = 1;

			if (get_sb(sb, off, size, agno) == XR_EOF)  {
				retval = 1;
				goto out;
			}

			if (verify_sb(sb, 0) == XR_OK)  {
				/*
				 * save away geometry info.
				 * don't bother checking the sb
				 * against the agi/agf as the odds
				 * of the sb being corrupted in a way
				 * that it is internally consistent
				 * but not consistent with the rest
				 * of the filesystem is really really low.
				 */
				get_sb_geometry(&geo, sb);
				list = add_geo(list, &geo, agno);
				num_ok++;
			}
		}
	}

	/*
	 * see if we have enough superblocks to bother with
	 */
	if (num_ok < num_sbs / 2)
		return(XR_INSUFF_SEC_SB);

	current = get_best_geo(list);

	/*
	 * check that enough sbs agree that we're willing to
	 * go with this geometry.  if not, print out the
	 * geometry and a message about the force option.
	 */
	switch (num_sbs)  {
	case 2:
		/*
		 * all them have to be right.  if not, report geometry
		 * and get out unless force option is in effect (-F)
		 */
		if (current->refs != 2)  {
			if (!force_geo)  {
				do_warn(
	_("Only two AGs detected and they do not match - cannot proceed.\n"));
				exit(1);
			}
		}
		break;
	case 1:
		/*
		 * just report the geometry info and get out.
		 * refuse to run further unless the force (-F)
		 * option is in effect.
		 */
		if (!force_geo)  {
			do_warn(_("Only one AG detected - cannot proceed.\n"));
			exit(1);
		}
	default:
		/*
		 * at least half of the probed superblocks have
		 * to agree.  if they don't, this fs is probably
		 * too far gone anyway considering the fact that
		 * XFS normally doesn't alter the secondary superblocks.
		 */
		if (current->refs < num_sbs / 2)  {
			do_warn(
		_("Not enough matching superblocks - cannot proceed.\n"));
			exit(1);
		}
	}

	/*
	 * set the geometry into primary superblock if necessary.
	 */

	if (current->index != sb_index)  {
		*sb_modified = 1;
		off = (xfs_off_t)current->index * current->geo.sb_agblocks
			* current->geo.sb_blocksize;
		if (get_sb(sb, off, current->geo.sb_sectsize,
				current->index) != XR_OK)
			do_error(_("could not read superblock\n"));

		copy_sb(sb, rsb);

		/*
		 * turn off inprogress bit since this is the primary.
		 * also save away values that we need to ensure are
		 * consistent in the other secondaries.
		 */
		rsb->sb_inprogress = 0;
		sb_inoalignmt = sb->sb_inoalignmt;
		sb_unit = sb->sb_unit;
		sb_width = sb->sb_width;
	}

	free_geo(list);
out:
	free(sb);
	free(checked);
	return(retval);
}