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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) 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 <sys/disk.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/ioctl.h>
#include <xfs/libxfs.h>

extern char *progname;

int
platform_check_ismounted(char *name, char *block, struct stat64 *s, int verbose)
{
	return 0;
}

int
platform_check_iswritable(char *name, char *block, struct stat64 *s, int fatal)
{
	int	fd, writable;

	if ((fd = open(block, O_RDONLY, 0)) < 0) {
		fprintf(stderr, _("%s: "
			"error opening the device special file \"%s\": %s\n"),
			progname, block, strerror(errno));
		exit(1);
	}

	if (ioctl(fd, DKIOCISWRITABLE, &writable) < 0) {
		fprintf(stderr, _("%s: can't tell if \"%s\" is writable: %s\n"),
			progname, block, strerror(errno));
		exit(1);
	}
	close(fd);
	return (writable == 0);
}

void
platform_set_blocksize(int fd, char *path, int blocksize)
{
}

void
platform_flush_device(int fd, dev_t device)
{
	ioctl(fd, DKIOCSYNCHRONIZECACHE, NULL);
}

void
platform_findsizes(char *path, int fd, long long *sz, int *bsz)
{
	__uint64_t	size;
	struct stat64	st;

	if (fstat64(fd, &st) < 0) {
		fprintf(stderr,
			_("%s: cannot stat the device file \"%s\": %s\n"),
			progname, path, strerror(errno));
		exit(1);
	}
	if ((st.st_mode & S_IFMT) == S_IFREG) {
		*sz = (long long)(st.st_size >> 9);
		*bsz = BBSIZE;
		return;
	}
	if (ioctl(fd, DKIOCGETBLOCKCOUNT, &size) < 0) {
		fprintf(stderr, _("%s: can't determine device size: %s\n"),
			progname, strerror(errno));
		exit(1);
	}
	*sz = (long long)size;
	*bsz = BBSIZE;
}

/* ARGSUSED */
int
platform_aio_init(int aio_count)
{
	return 0;		/* aio/lio_listio not available */
}

char *
platform_findrawpath(char *path)
{
	return path;
}

char *
platform_findblockpath(char *path)
{
	return path;
}

int
platform_direct_blockdev(void)
{
	return 0;
}

int
platform_align_blockdev(void)
{
	return (sizeof(void *));
}