1/*	$NetBSD: kobj.c,v 1.6 2019/01/27 02:08:35 pgoyette Exp $	*/
2
3/*-
4 * Copyright (c) 2009 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*-
33 * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
34 * All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 *    notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 *    notice, this list of conditions and the following disclaimer in the
43 *    documentation and/or other materials provided with the distribution.
44 *
45 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
48 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
55 * SUCH DAMAGE.
56 */
57
58#include <sys/cdefs.h>
59/* __FBSDID("$FreeBSD: head/sys/cddl/compat/opensolaris/kern/opensolaris_kobj.c 285391 2015-07-11 16:22:48Z mjg $"); */
60__KERNEL_RCSID(0, "$NetBSD: kobj.c,v 1.6 2019/01/27 02:08:35 pgoyette Exp $");
61
62#include <sys/types.h>
63#include <sys/systm.h>
64#include <sys/kernel.h>
65#include <sys/kthread.h>
66#include <sys/namei.h>
67#include <sys/proc.h>
68#include <sys/filedesc.h>
69#include <sys/fcntl.h>
70#include <sys/kobj.h>
71
72void
73kobj_free(void *address, size_t size)
74{
75
76	kmem_free(address, size);
77}
78
79void *
80kobj_alloc(size_t size, int flag)
81{
82
83	return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
84}
85
86void *
87kobj_zalloc(size_t size, int flag)
88{
89
90	return (kmem_zalloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
91}
92
93static void *
94kobj_open_file_vnode(const char *file)
95{
96	vnode_t *vp;
97
98	if (vn_open(file, UIO_SYSSPACE, FREAD|FCREAT, 0, &vp, CRCREAT, 0) != 0) {
99		return NULL;
100	}
101	return vp;
102}
103
104struct _buf *
105kobj_open_file(const char *file)
106{
107	struct _buf *out;
108
109	out = kmem_alloc(sizeof(*out), KM_SLEEP);
110	out->mounted = 1;
111	out->ptr = kobj_open_file_vnode(file);
112	if (out->ptr == NULL) {
113		kmem_free(out, sizeof(*out));
114		return ((struct _buf *)-1);
115	}
116	return (out);
117}
118
119static int
120kobj_get_filesize_vnode(struct _buf *file, uint64_t *size)
121{
122	struct vattr va;
123	int error;
124
125	error = VOP_GETATTR(file->ptr, &va, 0, kcred, NULL);
126	if (error == 0)
127		*size = (uint64_t)va.va_size;
128	return (error);
129}
130
131int
132kobj_get_filesize(struct _buf *file, uint64_t *size)
133{
134
135	return (kobj_get_filesize_vnode(file, size));
136}
137
138int
139kobj_read_file_vnode(struct _buf *file, char *buf, unsigned size, unsigned off)
140{
141	int error;
142	size_t resid;
143
144	error = vn_rdwr(UIO_READ, file->ptr, buf, size, off, UIO_SYSSPACE, 0,
145	    RLIM64_INFINITY, kcred, &resid);
146	return (error != 0 ? -1 : size - resid);
147}
148
149int
150kobj_read_file(struct _buf *file, char *buf, unsigned size, unsigned off)
151{
152
153	return (kobj_read_file_vnode(file, buf, size, off));
154}
155
156void
157kobj_close_file(struct _buf *file)
158{
159
160	if (file->mounted) {
161		vn_close(file->ptr, FREAD, kcred);
162	}
163	kmem_free(file, sizeof(*file));
164}
165