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
72 void
kobj_free(void * address,size_t size)73 kobj_free(void *address, size_t size)
74 {
75
76 kmem_free(address, size);
77 }
78
79 void *
kobj_alloc(size_t size,int flag)80 kobj_alloc(size_t size, int flag)
81 {
82
83 return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
84 }
85
86 void *
kobj_zalloc(size_t size,int flag)87 kobj_zalloc(size_t size, int flag)
88 {
89
90 return (kmem_zalloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
91 }
92
93 static void *
kobj_open_file_vnode(const char * file)94 kobj_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
104 struct _buf *
kobj_open_file(const char * file)105 kobj_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
119 static int
kobj_get_filesize_vnode(struct _buf * file,uint64_t * size)120 kobj_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
131 int
kobj_get_filesize(struct _buf * file,uint64_t * size)132 kobj_get_filesize(struct _buf *file, uint64_t *size)
133 {
134
135 return (kobj_get_filesize_vnode(file, size));
136 }
137
138 int
kobj_read_file_vnode(struct _buf * file,char * buf,unsigned size,unsigned off)139 kobj_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
149 int
kobj_read_file(struct _buf * file,char * buf,unsigned size,unsigned off)150 kobj_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
156 void
kobj_close_file(struct _buf * file)157 kobj_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