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1 | /* |
1 | /* |
2 | * Copyright (c) 2009 Jiri Svoboda |
2 | * Copyright (c) 2009 Jiri Svoboda |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup bd |
29 | /** @addtogroup bd |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file |
34 | * @file |
35 | * @brief File-backed block device driver |
35 | * @brief File-backed block device driver |
36 | * |
36 | * |
37 | * Allows accessing a file as a block device. Useful for, e.g., mounting |
37 | * Allows accessing a file as a block device. Useful for, e.g., mounting |
38 | * a disk image. |
38 | * a disk image. |
39 | */ |
39 | */ |
40 | 40 | ||
41 | #include <stdio.h> |
41 | #include <stdio.h> |
42 | #include <unistd.h> |
42 | #include <unistd.h> |
43 | #include <ipc/ipc.h> |
43 | #include <ipc/ipc.h> |
44 | #include <ipc/bd.h> |
44 | #include <ipc/bd.h> |
45 | #include <async.h> |
45 | #include <async.h> |
46 | #include <as.h> |
46 | #include <as.h> |
47 | #include <fibril_sync.h> |
47 | #include <fibril_sync.h> |
48 | #include <devmap.h> |
48 | #include <devmap.h> |
49 | #include <sys/types.h> |
49 | #include <sys/types.h> |
50 | #include <errno.h> |
50 | #include <errno.h> |
51 | #include <bool.h> |
51 | #include <bool.h> |
52 | 52 | ||
53 | #define NAME "file_bd" |
53 | #define NAME "file_bd" |
54 | 54 | ||
55 | static size_t comm_size; |
55 | static size_t comm_size; |
56 | static FILE *img; |
56 | static FILE *img; |
57 | 57 | ||
58 | static dev_handle_t dev_handle; |
58 | static dev_handle_t dev_handle; |
59 | static fibril_mutex_t dev_lock; |
59 | static fibril_mutex_t dev_lock; |
60 | 60 | ||
61 | static int file_bd_init(const char *fname); |
61 | static int file_bd_init(const char *fname); |
62 | static void file_bd_connection(ipc_callid_t iid, ipc_call_t *icall); |
62 | static void file_bd_connection(ipc_callid_t iid, ipc_call_t *icall); |
63 | static int file_bd_read(off_t blk_idx, size_t size, void *buf); |
63 | static int file_bd_read(off_t blk_idx, size_t size, void *buf); |
64 | static int file_bd_write(off_t blk_idx, size_t size, void *buf); |
64 | static int file_bd_write(off_t blk_idx, size_t size, void *buf); |
65 | 65 | ||
66 | int main(int argc, char **argv) |
66 | int main(int argc, char **argv) |
67 | { |
67 | { |
68 | int rc; |
68 | int rc; |
69 | 69 | ||
70 | printf(NAME ": File-backed block device driver\n"); |
70 | printf(NAME ": File-backed block device driver\n"); |
71 | 71 | ||
72 | if (argc != 3) { |
72 | if (argc != 3) { |
73 | printf("Expected two arguments (image name, device name).\n"); |
73 | printf("Expected two arguments (image name, device name).\n"); |
74 | return -1; |
74 | return -1; |
75 | } |
75 | } |
76 | 76 | ||
77 | if (file_bd_init(argv[1]) != EOK) |
77 | if (file_bd_init(argv[1]) != EOK) |
78 | return -1; |
78 | return -1; |
79 | 79 | ||
80 | rc = devmap_device_register(argv[2], &dev_handle); |
80 | rc = devmap_device_register(argv[2], &dev_handle); |
81 | if (rc != EOK) { |
81 | if (rc != EOK) { |
82 | devmap_hangup_phone(DEVMAP_DRIVER); |
82 | devmap_hangup_phone(DEVMAP_DRIVER); |
83 | printf(NAME ": Unable to register device %s.\n", |
83 | printf(NAME ": Unable to register device %s.\n", |
84 | argv[2]); |
84 | argv[2]); |
85 | return rc; |
85 | return rc; |
86 | } |
86 | } |
87 | 87 | ||
88 | printf(NAME ": Accepting connections\n"); |
88 | printf(NAME ": Accepting connections\n"); |
89 | async_manager(); |
89 | async_manager(); |
90 | 90 | ||
91 | /* Not reached */ |
91 | /* Not reached */ |
92 | return 0; |
92 | return 0; |
93 | } |
93 | } |
94 | 94 | ||
95 | static int file_bd_init(const char *fname) |
95 | static int file_bd_init(const char *fname) |
96 | { |
96 | { |
97 | int rc; |
97 | int rc; |
98 | 98 | ||
99 | rc = devmap_driver_register(NAME, file_bd_connection); |
99 | rc = devmap_driver_register(NAME, file_bd_connection); |
100 | if (rc < 0) { |
100 | if (rc < 0) { |
101 | printf(NAME ": Unable to register driver.\n"); |
101 | printf(NAME ": Unable to register driver.\n"); |
102 | return rc; |
102 | return rc; |
103 | } |
103 | } |
104 | 104 | ||
105 | img = fopen(fname, "rb+"); |
105 | img = fopen(fname, "rb+"); |
106 | if (img == NULL) |
106 | if (img == NULL) |
107 | return EINVAL; |
107 | return EINVAL; |
108 | 108 | ||
109 | fibril_mutex_initialize(&dev_lock); |
109 | fibril_mutex_initialize(&dev_lock); |
110 | 110 | ||
111 | return EOK; |
111 | return EOK; |
112 | } |
112 | } |
113 | 113 | ||
114 | static void file_bd_connection(ipc_callid_t iid, ipc_call_t *icall) |
114 | static void file_bd_connection(ipc_callid_t iid, ipc_call_t *icall) |
115 | { |
115 | { |
116 | void *fs_va = NULL; |
116 | void *fs_va = NULL; |
117 | ipc_callid_t callid; |
117 | ipc_callid_t callid; |
118 | ipc_call_t call; |
118 | ipc_call_t call; |
119 | ipcarg_t method; |
119 | ipcarg_t method; |
120 | int flags; |
120 | int flags; |
121 | int retval; |
121 | int retval; |
122 | off_t idx; |
122 | off_t idx; |
123 | size_t size; |
123 | size_t size; |
124 | 124 | ||
125 | /* Answer the IPC_M_CONNECT_ME_TO call. */ |
125 | /* Answer the IPC_M_CONNECT_ME_TO call. */ |
126 | ipc_answer_0(iid, EOK); |
126 | ipc_answer_0(iid, EOK); |
127 | 127 | ||
128 | if (!ipc_share_out_receive(&callid, &comm_size, &flags)) { |
128 | if (!ipc_share_out_receive(&callid, &comm_size, &flags)) { |
129 | ipc_answer_0(callid, EHANGUP); |
129 | ipc_answer_0(callid, EHANGUP); |
130 | return; |
130 | return; |
131 | } |
131 | } |
132 | 132 | ||
133 | fs_va = as_get_mappable_page(comm_size); |
133 | fs_va = as_get_mappable_page(comm_size); |
134 | if (fs_va == NULL) { |
134 | if (fs_va == NULL) { |
135 | ipc_answer_0(callid, EHANGUP); |
135 | ipc_answer_0(callid, EHANGUP); |
136 | return; |
136 | return; |
137 | } |
137 | } |
138 | 138 | ||
139 | (void) ipc_share_out_finalize(callid, fs_va); |
139 | (void) ipc_share_out_finalize(callid, fs_va); |
140 | 140 | ||
141 | while (1) { |
141 | while (1) { |
142 | callid = async_get_call(&call); |
142 | callid = async_get_call(&call); |
143 | method = IPC_GET_METHOD(call); |
143 | method = IPC_GET_METHOD(call); |
144 | switch (method) { |
144 | switch (method) { |
145 | case IPC_M_PHONE_HUNGUP: |
145 | case IPC_M_PHONE_HUNGUP: |
146 | /* The other side has hung up. */ |
146 | /* The other side has hung up. */ |
147 | ipc_answer_0(callid, EOK); |
147 | ipc_answer_0(callid, EOK); |
148 | return; |
148 | return; |
149 | case BD_READ_BLOCK: |
149 | case BD_READ_BLOCK: |
150 | case BD_WRITE_BLOCK: |
150 | case BD_WRITE_BLOCK: |
151 | idx = IPC_GET_ARG1(call); |
151 | idx = IPC_GET_ARG1(call); |
152 | size = IPC_GET_ARG2(call); |
152 | size = IPC_GET_ARG2(call); |
153 | if (size > comm_size) { |
153 | if (size > comm_size) { |
154 | retval = EINVAL; |
154 | retval = EINVAL; |
155 | break; |
155 | break; |
156 | } |
156 | } |
157 | if (method == BD_READ_BLOCK) |
157 | if (method == BD_READ_BLOCK) |
158 | retval = file_bd_read(idx, size, fs_va); |
158 | retval = file_bd_read(idx, size, fs_va); |
159 | else |
159 | else |
160 | retval = file_bd_write(idx, size, fs_va); |
160 | retval = file_bd_write(idx, size, fs_va); |
161 | break; |
161 | break; |
162 | default: |
162 | default: |
163 | retval = EINVAL; |
163 | retval = EINVAL; |
164 | break; |
164 | break; |
165 | } |
165 | } |
166 | ipc_answer_0(callid, retval); |
166 | ipc_answer_0(callid, retval); |
167 | } |
167 | } |
168 | } |
168 | } |
169 | 169 | ||
170 | static int file_bd_read(off_t blk_idx, size_t size, void *buf) |
170 | static int file_bd_read(off_t blk_idx, size_t size, void *buf) |
171 | { |
171 | { |
172 | size_t n_rd; |
172 | size_t n_rd; |
173 | 173 | ||
174 | fibril_mutex_lock(&dev_lock); |
174 | fibril_mutex_lock(&dev_lock); |
175 | 175 | ||
176 | fseek(img, blk_idx * size, SEEK_SET); |
176 | fseek(img, blk_idx * size, SEEK_SET); |
177 | n_rd = fread(buf, 1, size, img); |
177 | n_rd = fread(buf, 1, size, img); |
178 | 178 | ||
179 | if (ferror(img)) { |
179 | if (ferror(img)) { |
180 | fibril_mutex_unlock(&dev_lock); |
180 | fibril_mutex_unlock(&dev_lock); |
181 | return EIO; /* Read error */ |
181 | return EIO; /* Read error */ |
182 | } |
182 | } |
183 | 183 | ||
184 | fibril_mutex_unlock(&dev_lock); |
184 | fibril_mutex_unlock(&dev_lock); |
185 | 185 | ||
186 | if (n_rd < size) |
186 | if (n_rd < size) |
187 | return EINVAL; /* Read beyond end of disk */ |
187 | return EINVAL; /* Read beyond end of disk */ |
188 | 188 | ||
189 | return EOK; |
189 | return EOK; |
190 | } |
190 | } |
191 | 191 | ||
192 | static int file_bd_write(off_t blk_idx, size_t size, void *buf) |
192 | static int file_bd_write(off_t blk_idx, size_t size, void *buf) |
193 | { |
193 | { |
194 | size_t n_wr; |
194 | size_t n_wr; |
195 | 195 | ||
196 | fibril_mutex_lock(&dev_lock); |
196 | fibril_mutex_lock(&dev_lock); |
197 | 197 | ||
198 | fseek(img, blk_idx * size, SEEK_SET); |
198 | fseek(img, blk_idx * size, SEEK_SET); |
199 | n_wr = fread(buf, 1, size, img); |
199 | n_wr = fread(buf, 1, size, img); |
200 | 200 | ||
201 | if (ferror(img) || n_wr < size) { |
201 | if (ferror(img) || n_wr < size) { |
202 | fibril_mutex_unlock(&dev_lock); |
202 | fibril_mutex_unlock(&dev_lock); |
203 | return EIO; /* Write error */ |
203 | return EIO; /* Write error */ |
204 | } |
204 | } |
205 | 205 | ||
206 | fibril_mutex_unlock(&dev_lock); |
206 | fibril_mutex_unlock(&dev_lock); |
207 | 207 | ||
208 | return EOK; |
208 | return EOK; |
209 | } |
209 | } |
210 | 210 | ||
211 | /** |
211 | /** |
212 | * @} |
212 | * @} |
213 | */ |
213 | */ |
214 | 214 |