/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"

#include <fcntl.h>

#include <errno.h>

#include <sys/types.h>

#include <sys/stat.h>

/*

 * Return the proper Posix error number for a failed (EINVAL) fcntl() operation.

 */

static int

fallocate_errno(int fd)

{

	struct stat64 statb;

	int error;

	if (fstat64(fd, &statb) != 0)		/* can't happen? */

		error = EBADF;

	else if (S_ISFIFO(statb.st_mode))	/* pipe or FIFO */

		error = ESPIPE;

	else if (!S_ISREG(statb.st_mode))	/* not a regular file */

		error = ENODEV;

	else			/* the file system doesn't support F_ALLOCSP */

		error = EINVAL;

	return (error);

}

int

posix_fallocate(int fd, off_t offset, off_t len)

{

	struct flock lck;

	int error;

	if (offset < 0 || len <= 0)

		return (EINVAL);

	lck.l_whence = 0;

	lck.l_start = offset;

	lck.l_len = len;

	lck.l_type = F_WRLCK;

	if (fcntl(fd, F_ALLOCSP, &lck) == -1) {

		if ((error = errno) == EINVAL)

			error = fallocate_errno(fd);

		else if (error == EOVERFLOW)

			error = EFBIG;

		return (error);

	}

	return (0);

}

#if !defined(_LP64)

int

posix_fallocate64(int fd, off64_t offset, off64_t len)

{

	struct flock64 lck;

	int error;

	if (offset < 0 || len <= 0)

		return (EINVAL);

	lck.l_whence = 0;

	lck.l_start = offset;

	lck.l_len = len;

	lck.l_type = F_WRLCK;

	if (fcntl(fd, F_ALLOCSP64, &lck) == -1) {

		if ((error = errno) == EINVAL)

			error = fallocate_errno(fd);

		else if (error == EOVERFLOW)

			error = EFBIG;

		return (error);

	}

	return (0);

}

#endif