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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) 2000-2006 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
 */
#ifndef LIBXFS_INIT_H
#define LIBXFS_INIT_H

struct stat64;

extern int platform_check_ismounted (char *path, char *block,
					struct stat64 *sptr, int verbose);
extern int platform_check_iswritable (char *path, char *block,
					struct stat64 *sptr, int fatal);
extern void platform_findsizes (char *path, int fd, long long *sz, int *bsz);
extern void platform_set_blocksize (int fd, char *path, int blocksize);
extern void platform_flush_device (int fd, dev_t device);
extern char *platform_findrawpath(char *path);
extern char *platform_findrawpath (char *path);
extern char *platform_findblockpath (char *path);
extern int platform_direct_blockdev (void);
extern int platform_align_blockdev (void);
extern int platform_aio_init (int aio_count);

#endif	/* LIBXFS_INIT_H */