1 /*-
2 * Copyright (c) 2011 Google, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 /*
31 * Read from the host filesystem
32 */
33
34 #include <sys/param.h>
35 #include <sys/time.h>
36 #include <stddef.h>
37 #include <stdarg.h>
38 #include <string.h>
39 #include <stand.h>
40 #include <bootstrap.h>
41
42 #include "libuserboot.h"
43
44 /*
45 * Open a file.
46 */
47 static int
host_open(const char * upath,struct open_file * f)48 host_open(const char *upath, struct open_file *f)
49 {
50
51 if (f->f_dev != &host_dev)
52 return (EINVAL);
53
54 return (CALLBACK(open, upath, &f->f_fsdata));
55 }
56
57 static int
host_close(struct open_file * f)58 host_close(struct open_file *f)
59 {
60
61 CALLBACK(close, f->f_fsdata);
62 f->f_fsdata = (void *)0;
63
64 return (0);
65 }
66
67 /*
68 * Copy a portion of a file into memory.
69 */
70 static int
host_read(struct open_file * f,void * start,size_t size,size_t * resid)71 host_read(struct open_file *f, void *start, size_t size, size_t *resid)
72 {
73
74 return (CALLBACK(read, f->f_fsdata, start, size, resid));
75 }
76
77 static off_t
host_seek(struct open_file * f,off_t offset,int where)78 host_seek(struct open_file *f, off_t offset, int where)
79 {
80
81 return (CALLBACK(seek, f->f_fsdata, offset, where));
82 }
83
84 static int
host_stat(struct open_file * f,struct stat * sb)85 host_stat(struct open_file *f, struct stat *sb)
86 {
87 int mode;
88 int uid;
89 int gid;
90 uint64_t size;
91
92 CALLBACK(stat, f->f_fsdata, &mode, &uid, &gid, &size);
93 sb->st_mode = mode;
94 sb->st_uid = uid;
95 sb->st_gid = gid;
96 sb->st_size = size;
97 return (0);
98 }
99
100 static int
host_readdir(struct open_file * f,struct dirent * d)101 host_readdir(struct open_file *f, struct dirent *d)
102 {
103 uint32_t fileno;
104 uint8_t type;
105 size_t namelen;
106 int rc;
107
108 rc = CALLBACK(readdir, f->f_fsdata, &fileno, &type, &namelen,
109 d->d_name);
110 if (rc)
111 return (rc);
112
113 d->d_fileno = fileno;
114 d->d_type = type;
115 d->d_namlen = namelen;
116
117 return (0);
118 }
119
120 static int
host_dev_init(void)121 host_dev_init(void)
122 {
123
124 return (0);
125 }
126
127 static int
host_dev_print(int verbose)128 host_dev_print(int verbose)
129 {
130 char line[80];
131
132 printf("%s devices:", host_dev.dv_name);
133 if (pager_output("\n") != 0)
134 return (1);
135
136 snprintf(line, sizeof(line), " host%d: Host filesystem\n", 0);
137 return (pager_output(line));
138 }
139
140 /*
141 * 'Open' the host device.
142 */
143 static int
host_dev_open(struct open_file * f,...)144 host_dev_open(struct open_file *f, ...)
145 {
146 va_list args;
147 struct devdesc *dev;
148
149 va_start(args, f);
150 dev = va_arg(args, struct devdesc*);
151 va_end(args);
152
153 return (0);
154 }
155
156 static int
host_dev_close(struct open_file * f)157 host_dev_close(struct open_file *f)
158 {
159
160 return (0);
161 }
162
163 static int
host_dev_strategy(void * devdata,int rw,daddr_t dblk,size_t size,char * buf,size_t * rsize)164 host_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size,
165 char *buf, size_t *rsize)
166 {
167
168 return (ENOSYS);
169 }
170
171 struct fs_ops host_fsops = {
172 "host",
173 host_open,
174 host_close,
175 host_read,
176 null_write,
177 host_seek,
178 host_stat,
179 host_readdir
180 };
181
182 struct devsw host_dev = {
183 .dv_name = "host",
184 .dv_type = DEVT_NET,
185 .dv_init = host_dev_init,
186 .dv_strategy = host_dev_strategy,
187 .dv_open = host_dev_open,
188 .dv_close = host_dev_close,
189 .dv_ioctl = noioctl,
190 .dv_print = host_dev_print,
191 .dv_cleanup = NULL
192 };
193