1 | /* |
---|
2 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
---|
3 | * |
---|
4 | * The license and distribution terms for this file may be |
---|
5 | * found in the file LICENSE in this distribution or at |
---|
6 | * http://www.rtems.com/license/LICENSE. |
---|
7 | * |
---|
8 | * $Id$ |
---|
9 | */ |
---|
10 | /** |
---|
11 | * @file |
---|
12 | * |
---|
13 | * @ingroup rtems-rfs |
---|
14 | * |
---|
15 | * RTEMS RFS File Handlers |
---|
16 | * |
---|
17 | * This file contains the set of handlers used to process operations on |
---|
18 | * RFS file nodes. |
---|
19 | */ |
---|
20 | |
---|
21 | #if HAVE_CONFIG_H |
---|
22 | #include "config.h" |
---|
23 | #endif |
---|
24 | |
---|
25 | #include <inttypes.h> |
---|
26 | |
---|
27 | #if SIZEOF_OFF_T == 8 |
---|
28 | #define PRIdoff_t PRId64 |
---|
29 | #elif SIZEOF_OFF_T == 4 |
---|
30 | #define PRIdoff_t PRId32 |
---|
31 | #else |
---|
32 | #error "unsupported size of off_t" |
---|
33 | #endif |
---|
34 | |
---|
35 | #include <rtems/rfs/rtems-rfs-file.h> |
---|
36 | #include "rtems-rfs-rtems.h" |
---|
37 | |
---|
38 | /** |
---|
39 | * This routine processes the open() system call. Note that there is nothing |
---|
40 | * special to be done at open() time. |
---|
41 | * |
---|
42 | * @param iop |
---|
43 | * @param pathname |
---|
44 | * @param flag |
---|
45 | * @param mode |
---|
46 | * @return int |
---|
47 | */ |
---|
48 | |
---|
49 | static int |
---|
50 | rtems_rfs_rtems_file_open (rtems_libio_t* iop, |
---|
51 | const char* pathname, |
---|
52 | uint32_t flag, |
---|
53 | uint32_t mode) |
---|
54 | { |
---|
55 | rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); |
---|
56 | rtems_rfs_ino ino; |
---|
57 | rtems_rfs_file_handle* file; |
---|
58 | uint32_t flags; |
---|
59 | int rc; |
---|
60 | |
---|
61 | flags = 0; |
---|
62 | |
---|
63 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) |
---|
64 | printf("rtems-rfs: file-open: path:%s ino:%" PRId32 " flags:%04" PRIx32 " mode:%04" PRIx32 "\n", |
---|
65 | pathname, ino, flags, mode); |
---|
66 | |
---|
67 | rtems_rfs_rtems_lock (fs); |
---|
68 | |
---|
69 | ino = rtems_rfs_rtems_get_iop_ino (iop); |
---|
70 | |
---|
71 | rc = rtems_rfs_file_open (fs, ino, flags, &file); |
---|
72 | if (rc > 0) |
---|
73 | { |
---|
74 | rtems_rfs_rtems_unlock (fs); |
---|
75 | return rtems_rfs_rtems_error ("file-open: open", rc); |
---|
76 | } |
---|
77 | |
---|
78 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) |
---|
79 | printf("rtems-rfs: file-open: handle:%p\n", file); |
---|
80 | |
---|
81 | iop->size = rtems_rfs_file_size (file); |
---|
82 | rtems_rfs_rtems_set_iop_file_handle (iop, file); |
---|
83 | |
---|
84 | rtems_rfs_rtems_unlock (fs); |
---|
85 | return 0; |
---|
86 | } |
---|
87 | |
---|
88 | /** |
---|
89 | * This routine processes the close() system call. Note that there is nothing |
---|
90 | * to flush at this point. |
---|
91 | * |
---|
92 | * @param iop |
---|
93 | * @return int |
---|
94 | */ |
---|
95 | static int |
---|
96 | rtems_rfs_rtems_file_close (rtems_libio_t* iop) |
---|
97 | { |
---|
98 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
---|
99 | rtems_rfs_file_system* fs = rtems_rfs_file_fs (file); |
---|
100 | int rc; |
---|
101 | |
---|
102 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_CLOSE)) |
---|
103 | printf("rtems-rfs: file-close: handle:%p\n", file); |
---|
104 | |
---|
105 | rtems_rfs_rtems_lock (fs); |
---|
106 | |
---|
107 | rc = rtems_rfs_file_close (fs, file); |
---|
108 | if (rc > 0) |
---|
109 | rc = rtems_rfs_rtems_error ("file-close: file close", rc); |
---|
110 | |
---|
111 | rtems_rfs_rtems_unlock (fs); |
---|
112 | return rc; |
---|
113 | } |
---|
114 | |
---|
115 | /** |
---|
116 | * This routine processes the read() system call. |
---|
117 | * |
---|
118 | * @param iop |
---|
119 | * @param buffer |
---|
120 | * @param count |
---|
121 | * @return int |
---|
122 | */ |
---|
123 | static ssize_t |
---|
124 | rtems_rfs_rtems_file_read (rtems_libio_t* iop, |
---|
125 | void* buffer, |
---|
126 | size_t count) |
---|
127 | { |
---|
128 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
---|
129 | rtems_rfs_pos pos; |
---|
130 | uint8_t* data = buffer; |
---|
131 | ssize_t read = 0; |
---|
132 | int rc; |
---|
133 | |
---|
134 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_READ)) |
---|
135 | printf("rtems-rfs: file-read: handle:%p count:%zd\n", file, count); |
---|
136 | |
---|
137 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
---|
138 | |
---|
139 | pos = iop->offset; |
---|
140 | |
---|
141 | if (pos < rtems_rfs_file_size (file)) |
---|
142 | { |
---|
143 | while (count) |
---|
144 | { |
---|
145 | size_t size; |
---|
146 | |
---|
147 | rc = rtems_rfs_file_io_start (file, &size, true); |
---|
148 | if (rc > 0) |
---|
149 | { |
---|
150 | read = rtems_rfs_rtems_error ("file-read: read: io-start", rc); |
---|
151 | break; |
---|
152 | } |
---|
153 | |
---|
154 | if (size == 0) |
---|
155 | break; |
---|
156 | |
---|
157 | if (size > count) |
---|
158 | size = count; |
---|
159 | |
---|
160 | memcpy (data, rtems_rfs_file_data (file), size); |
---|
161 | |
---|
162 | data += size; |
---|
163 | count -= size; |
---|
164 | read += size; |
---|
165 | |
---|
166 | rc = rtems_rfs_file_io_end (file, size, true); |
---|
167 | if (rc > 0) |
---|
168 | { |
---|
169 | read = rtems_rfs_rtems_error ("file-read: read: io-end", rc); |
---|
170 | break; |
---|
171 | } |
---|
172 | } |
---|
173 | } |
---|
174 | |
---|
175 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
176 | |
---|
177 | return read; |
---|
178 | } |
---|
179 | |
---|
180 | /** |
---|
181 | * This routine processes the write() system call. |
---|
182 | * |
---|
183 | * @param iop |
---|
184 | * @param buffer |
---|
185 | * @param count |
---|
186 | * @return ssize_t |
---|
187 | */ |
---|
188 | static ssize_t |
---|
189 | rtems_rfs_rtems_file_write (rtems_libio_t* iop, |
---|
190 | const void* buffer, |
---|
191 | size_t count) |
---|
192 | { |
---|
193 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
---|
194 | rtems_rfs_pos pos; |
---|
195 | const uint8_t* data = buffer; |
---|
196 | ssize_t write = 0; |
---|
197 | int rc; |
---|
198 | |
---|
199 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_WRITE)) |
---|
200 | printf("rtems-rfs: file-write: handle:%p count:%zd\n", file, count); |
---|
201 | |
---|
202 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
---|
203 | |
---|
204 | pos = iop->offset; |
---|
205 | |
---|
206 | /* |
---|
207 | * If the iop position is past the physical end of the file we need to set |
---|
208 | * the file size to the new length before writing. If the position equals the |
---|
209 | * size of file we are still past the end of the file as positions number |
---|
210 | * from 0. For a specific position we need a file that has a length of one |
---|
211 | * more. |
---|
212 | */ |
---|
213 | |
---|
214 | if (pos >= rtems_rfs_file_size (file)) |
---|
215 | { |
---|
216 | rc = rtems_rfs_file_set_size (file, pos + 1); |
---|
217 | if (rc) |
---|
218 | { |
---|
219 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
220 | return rtems_rfs_rtems_error ("file-write: write extend", rc); |
---|
221 | } |
---|
222 | } |
---|
223 | |
---|
224 | rtems_rfs_file_set_bpos (file, pos); |
---|
225 | |
---|
226 | while (count) |
---|
227 | { |
---|
228 | size_t size = count; |
---|
229 | |
---|
230 | rc = rtems_rfs_file_io_start (file, &size, false); |
---|
231 | if (rc) |
---|
232 | { |
---|
233 | write = rtems_rfs_rtems_error ("file-write: write open", rc); |
---|
234 | break; |
---|
235 | } |
---|
236 | |
---|
237 | if (size > count) |
---|
238 | size = count; |
---|
239 | |
---|
240 | memcpy (rtems_rfs_file_data (file), data, size); |
---|
241 | |
---|
242 | data += size; |
---|
243 | count -= size; |
---|
244 | write += size; |
---|
245 | |
---|
246 | rc = rtems_rfs_file_io_end (file, size, false); |
---|
247 | if (rc) |
---|
248 | { |
---|
249 | write = rtems_rfs_rtems_error ("file-write: write close", rc); |
---|
250 | break; |
---|
251 | } |
---|
252 | } |
---|
253 | |
---|
254 | iop->size = rtems_rfs_file_size (file); |
---|
255 | |
---|
256 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
257 | |
---|
258 | return write; |
---|
259 | } |
---|
260 | |
---|
261 | /** |
---|
262 | * This routine processes the ioctl() system call. |
---|
263 | * |
---|
264 | * @note No ioctl()'s are currently supported for RFS files. |
---|
265 | * |
---|
266 | * @param iop |
---|
267 | * @param command |
---|
268 | * @param buffer |
---|
269 | */ |
---|
270 | |
---|
271 | static int |
---|
272 | rtems_rfs_rtems_file_ioctl (rtems_libio_t* iop, uint32_t command, void* buffer) |
---|
273 | { |
---|
274 | return 0; |
---|
275 | } |
---|
276 | |
---|
277 | /** |
---|
278 | * This routine processes the lseek() system call. |
---|
279 | * |
---|
280 | * @param iop |
---|
281 | * @param offset |
---|
282 | * @param whence |
---|
283 | * @return off_t |
---|
284 | */ |
---|
285 | static off_t |
---|
286 | rtems_rfs_rtems_file_lseek (rtems_libio_t* iop, |
---|
287 | off_t offset, |
---|
288 | int whence) |
---|
289 | { |
---|
290 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
---|
291 | rtems_rfs_pos pos; |
---|
292 | int rc; |
---|
293 | |
---|
294 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_LSEEK)) |
---|
295 | printf("rtems-rfs: file-lseek: handle:%p offset:%" PRIdoff_t "\n", file, offset); |
---|
296 | |
---|
297 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
---|
298 | |
---|
299 | pos = iop->offset; |
---|
300 | |
---|
301 | rc = rtems_rfs_file_seek (file, pos, &pos); |
---|
302 | if (rc) |
---|
303 | { |
---|
304 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
305 | return rtems_rfs_rtems_error ("file_lseek: lseek", rc); |
---|
306 | } |
---|
307 | |
---|
308 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
309 | |
---|
310 | return iop->offset; |
---|
311 | } |
---|
312 | |
---|
313 | /** |
---|
314 | * This routine processes the ftruncate() system call. |
---|
315 | * |
---|
316 | * @param iop |
---|
317 | * @param length |
---|
318 | * @return int |
---|
319 | */ |
---|
320 | static int |
---|
321 | rtems_rfs_rtems_file_ftruncate (rtems_libio_t* iop, |
---|
322 | off_t length) |
---|
323 | { |
---|
324 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
---|
325 | int rc; |
---|
326 | |
---|
327 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_FTRUNC)) |
---|
328 | printf("rtems-rfs: file-ftrunc: handle:%p length:%" PRIdoff_t "\n", file, length); |
---|
329 | |
---|
330 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
---|
331 | |
---|
332 | rc = rtems_rfs_file_set_size (file, length); |
---|
333 | if (rc) |
---|
334 | rc = rtems_rfs_rtems_error ("file_ftruncate: set size", rc); |
---|
335 | |
---|
336 | iop->size = rtems_rfs_file_size (file); |
---|
337 | |
---|
338 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
---|
339 | |
---|
340 | return rc; |
---|
341 | } |
---|
342 | |
---|
343 | /* |
---|
344 | * Set of operations handlers for operations on RFS files. |
---|
345 | */ |
---|
346 | |
---|
347 | const rtems_filesystem_file_handlers_r rtems_rfs_rtems_file_handlers = { |
---|
348 | .open_h = rtems_rfs_rtems_file_open, |
---|
349 | .close_h = rtems_rfs_rtems_file_close, |
---|
350 | .read_h = rtems_rfs_rtems_file_read, |
---|
351 | .write_h = rtems_rfs_rtems_file_write, |
---|
352 | .ioctl_h = rtems_rfs_rtems_file_ioctl, |
---|
353 | .lseek_h = rtems_rfs_rtems_file_lseek, |
---|
354 | .fstat_h = rtems_rfs_rtems_fstat, |
---|
355 | .fchmod_h = rtems_rfs_rtems_fchmod, |
---|
356 | .ftruncate_h = rtems_rfs_rtems_file_ftruncate, |
---|
357 | .fpathconf_h = rtems_filesystem_default_fpathconf, |
---|
358 | .fsync_h = rtems_rfs_rtems_fdatasync, |
---|
359 | .fdatasync_h = rtems_rfs_rtems_fdatasync, |
---|
360 | .fcntl_h = rtems_filesystem_default_fcntl, |
---|
361 | .rmnod_h = rtems_rfs_rtems_rmnod |
---|
362 | }; |
---|