1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29#include "lint.h"
30#include <fcntl.h>
31#include <errno.h>
32#include <sys/types.h>
33#include <sys/stat.h>
34
35/*
36 * Return the proper Posix error number for a failed (EINVAL) fcntl() operation.
37 */
38static int
39fallocate_errno(int fd)
40{
41	struct stat64 statb;
42	int error;
43
44	if (fstat64(fd, &statb) != 0)		/* can't happen? */
45		error = EBADF;
46	else if (S_ISFIFO(statb.st_mode))	/* pipe or FIFO */
47		error = ESPIPE;
48	else if (!S_ISREG(statb.st_mode))	/* not a regular file */
49		error = ENODEV;
50	else			/* the file system doesn't support F_ALLOCSP */
51		error = EINVAL;
52
53	return (error);
54}
55
56int
57posix_fallocate(int fd, off_t offset, off_t len)
58{
59	struct flock lck;
60	int error;
61
62	if (offset < 0 || len <= 0)
63		return (EINVAL);
64
65	lck.l_whence = 0;
66	lck.l_start = offset;
67	lck.l_len = len;
68	lck.l_type = F_WRLCK;
69
70	if (fcntl(fd, F_ALLOCSP, &lck) == -1) {
71		if ((error = errno) == EINVAL)
72			error = fallocate_errno(fd);
73		else if (error == EOVERFLOW)
74			error = EFBIG;
75		return (error);
76	}
77	return (0);
78}
79
80#if !defined(_LP64)
81
82int
83posix_fallocate64(int fd, off64_t offset, off64_t len)
84{
85	struct flock64 lck;
86	int error;
87
88	if (offset < 0 || len <= 0)
89		return (EINVAL);
90
91	lck.l_whence = 0;
92	lck.l_start = offset;
93	lck.l_len = len;
94	lck.l_type = F_WRLCK;
95
96	if (fcntl(fd, F_ALLOCSP64, &lck) == -1) {
97		if ((error = errno) == EINVAL)
98			error = fallocate_errno(fd);
99		else if (error == EOVERFLOW)
100			error = EFBIG;
101		return (error);
102	}
103	return (0);
104}
105
106#endif
107