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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) 2000-2001,2005 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 "globals.h"
#include "agheader.h"
#include "protos.h"
#include "err_protos.h"

void
no_sb(void)
{
	do_warn(_("Sorry, could not find valid secondary superblock\n"));
	do_warn(_("Exiting now.\n"));
	exit(1);
}

char *
alloc_ag_buf(int size)
{
	char	*bp;

	bp = (char *)memalign(libxfs_device_alignment(), size);
	if (!bp)
		do_error(_("could not allocate ag header buffer (%d bytes)\n"),
			size);
	return(bp);
}

/*
 * this has got to be big enough to hold 4 sectors
 */
#define MAX_SECTSIZE		(512 * 1024)

/* ARGSUSED */
void
phase1(xfs_mount_t *mp)
{
	xfs_sb_t		*sb;
	char			*ag_bp;
	int			rval;

	do_log(_("Phase 1 - find and verify superblock...\n"));

	primary_sb_modified = 0;
	need_root_inode = 0;
	need_root_dotdot = 0;
	need_rbmino = 0;
	need_rsumino = 0;
	lost_quotas = 0;
	old_orphanage_ino = (xfs_ino_t) 0;

	/*
	 * get AG 0 into ag header buf
	 */
	ag_bp = alloc_ag_buf(MAX_SECTSIZE);
	sb = (xfs_sb_t *) ag_bp;

	if (get_sb(sb, 0LL, MAX_SECTSIZE, 0) == XR_EOF)
		do_error(_("error reading primary superblock\n"));

	/*
	 * is this really an sb, verify internal consistency
	 */
	if ((rval = verify_sb(sb, 1)) != XR_OK)  {
		do_warn(_("bad primary superblock - %s !!!\n"),
			err_string(rval));
		if (!find_secondary_sb(sb))
			no_sb();
		primary_sb_modified = 1;
	} else if ((rval = verify_set_primary_sb(sb, 0,
					&primary_sb_modified)) != XR_OK)  {
		do_warn(_("couldn't verify primary superblock - %s !!!\n"),
			err_string(rval));
		if (!find_secondary_sb(sb))
			no_sb();
		primary_sb_modified = 1;
	}

	if (primary_sb_modified)  {
		if (!no_modify)  {
			do_warn(_("writing modified primary superblock\n"));
			write_primary_sb(sb, sb->sb_sectsize);
		} else  {
			do_warn(_("would write modified primary superblock\n"));
		}
	}

	/*
	 * misc. global var initialization
	 */
	sb_ifree = sb_icount = sb_fdblocks = sb_frextents = 0;

	free(sb);
}