1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief RTEMS File Systems Inode Routines |
---|
5 | * @ingroup rtems_rfs |
---|
6 | * |
---|
7 | * These functions manage inodes in the RFS file system. An inode is part of a |
---|
8 | * block that reside after the bitmaps in the group. |
---|
9 | */ |
---|
10 | /* |
---|
11 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
---|
12 | * |
---|
13 | * The license and distribution terms for this file may be |
---|
14 | * found in the file LICENSE in this distribution or at |
---|
15 | * http://www.rtems.org/license/LICENSE. |
---|
16 | */ |
---|
17 | |
---|
18 | #if HAVE_CONFIG_H |
---|
19 | #include "config.h" |
---|
20 | #endif |
---|
21 | |
---|
22 | #include <inttypes.h> |
---|
23 | #include <string.h> |
---|
24 | |
---|
25 | #include <rtems/rfs/rtems-rfs-block.h> |
---|
26 | #include <rtems/rfs/rtems-rfs-file-system.h> |
---|
27 | #include <rtems/rfs/rtems-rfs-inode.h> |
---|
28 | #include <rtems/rfs/rtems-rfs-dir.h> |
---|
29 | |
---|
30 | int |
---|
31 | rtems_rfs_inode_alloc (rtems_rfs_file_system* fs, |
---|
32 | rtems_rfs_bitmap_bit goal, |
---|
33 | rtems_rfs_ino* ino) |
---|
34 | { |
---|
35 | rtems_rfs_bitmap_bit bit; |
---|
36 | int rc; |
---|
37 | rc = rtems_rfs_group_bitmap_alloc (fs, goal, true, &bit); |
---|
38 | *ino = bit; |
---|
39 | return rc; |
---|
40 | } |
---|
41 | |
---|
42 | int |
---|
43 | rtems_rfs_inode_free (rtems_rfs_file_system* fs, |
---|
44 | rtems_rfs_ino ino) |
---|
45 | { |
---|
46 | rtems_rfs_bitmap_bit bit; |
---|
47 | bit = ino; |
---|
48 | return rtems_rfs_group_bitmap_free (fs, true, bit); |
---|
49 | } |
---|
50 | |
---|
51 | int |
---|
52 | rtems_rfs_inode_open (rtems_rfs_file_system* fs, |
---|
53 | rtems_rfs_ino ino, |
---|
54 | rtems_rfs_inode_handle* handle, |
---|
55 | bool load) |
---|
56 | { |
---|
57 | int group; |
---|
58 | int gino; |
---|
59 | int index; |
---|
60 | int rc; |
---|
61 | |
---|
62 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_OPEN)) |
---|
63 | printf ("rtems-rfs: inode-open: ino: %" PRIu32 "\n", ino); |
---|
64 | |
---|
65 | if (ino == RTEMS_RFS_EMPTY_INO) |
---|
66 | return EINVAL; |
---|
67 | |
---|
68 | if ((ino - RTEMS_RFS_ROOT_INO) > rtems_rfs_fs_inodes (fs)) |
---|
69 | return EINVAL; |
---|
70 | |
---|
71 | handle->ino = ino; |
---|
72 | handle->node = NULL; |
---|
73 | handle->loads = 0; |
---|
74 | |
---|
75 | gino = ino - RTEMS_RFS_ROOT_INO; |
---|
76 | group = gino / fs->group_inodes; |
---|
77 | gino = gino % fs->group_inodes; |
---|
78 | index = (gino / fs->inodes_per_block) + RTEMS_RFS_GROUP_INODE_BLOCK; |
---|
79 | |
---|
80 | handle->offset = gino % fs->inodes_per_block; |
---|
81 | handle->block = rtems_rfs_group_block (&fs->groups[group], index); |
---|
82 | |
---|
83 | rc = rtems_rfs_buffer_handle_open (fs, &handle->buffer); |
---|
84 | if ((rc == 0) && load) |
---|
85 | rc = rtems_rfs_inode_load (fs, handle); |
---|
86 | return rc; |
---|
87 | } |
---|
88 | |
---|
89 | int |
---|
90 | rtems_rfs_inode_close (rtems_rfs_file_system* fs, |
---|
91 | rtems_rfs_inode_handle* handle) |
---|
92 | { |
---|
93 | int rc; |
---|
94 | |
---|
95 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_CLOSE)) |
---|
96 | printf ("rtems-rfs: inode-close: ino: %" PRIu32 "\n", handle->ino); |
---|
97 | |
---|
98 | rc = rtems_rfs_inode_unload (fs, handle, true); |
---|
99 | |
---|
100 | if ((rc == 0) && (handle->loads > 0)) |
---|
101 | { |
---|
102 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_CLOSE)) |
---|
103 | printf ("rtems-rfs: inode-close: bad loads number: %d\n", |
---|
104 | handle->loads); |
---|
105 | rc = EIO; |
---|
106 | } |
---|
107 | |
---|
108 | handle->ino = 0; |
---|
109 | return rc; |
---|
110 | } |
---|
111 | |
---|
112 | int |
---|
113 | rtems_rfs_inode_load (rtems_rfs_file_system* fs, |
---|
114 | rtems_rfs_inode_handle* handle) |
---|
115 | { |
---|
116 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_LOAD)) |
---|
117 | printf ("rtems-rfs: inode-load: ino=%" PRIu32 " loads=%i loaded=%s\n", |
---|
118 | handle->ino, handle->loads, |
---|
119 | rtems_rfs_inode_is_loaded (handle) ? "yes" : "no"); |
---|
120 | |
---|
121 | /* |
---|
122 | * An inode does not move so once loaded no need to do again. |
---|
123 | */ |
---|
124 | |
---|
125 | if (!rtems_rfs_inode_is_loaded (handle)) |
---|
126 | { |
---|
127 | int rc; |
---|
128 | |
---|
129 | rc = rtems_rfs_buffer_handle_request (fs,&handle->buffer, |
---|
130 | handle->block, true); |
---|
131 | if (rc > 0) |
---|
132 | return rc; |
---|
133 | |
---|
134 | handle->node = rtems_rfs_buffer_data (&handle->buffer); |
---|
135 | handle->node += handle->offset; |
---|
136 | } |
---|
137 | |
---|
138 | handle->loads++; |
---|
139 | |
---|
140 | return 0; |
---|
141 | } |
---|
142 | |
---|
143 | int |
---|
144 | rtems_rfs_inode_unload (rtems_rfs_file_system* fs, |
---|
145 | rtems_rfs_inode_handle* handle, |
---|
146 | bool update_ctime) |
---|
147 | { |
---|
148 | int rc = 0; |
---|
149 | |
---|
150 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_UNLOAD)) |
---|
151 | printf ("rtems-rfs: inode-unload: ino=%" PRIu32 " loads=%i loaded=%s\n", |
---|
152 | handle->ino, handle->loads, |
---|
153 | rtems_rfs_inode_is_loaded (handle) ? "yes" : "no"); |
---|
154 | |
---|
155 | if (rtems_rfs_inode_is_loaded (handle)) |
---|
156 | { |
---|
157 | if (handle->loads == 0) |
---|
158 | return EIO; |
---|
159 | |
---|
160 | handle->loads--; |
---|
161 | |
---|
162 | if (handle->loads == 0) |
---|
163 | { |
---|
164 | /* |
---|
165 | * If the buffer is dirty it will be release. Also set the ctime. |
---|
166 | */ |
---|
167 | if (rtems_rfs_buffer_dirty (&handle->buffer) && update_ctime) |
---|
168 | rtems_rfs_inode_set_ctime (handle, time (NULL)); |
---|
169 | rc = rtems_rfs_buffer_handle_release (fs, &handle->buffer); |
---|
170 | handle->node = NULL; |
---|
171 | } |
---|
172 | } |
---|
173 | |
---|
174 | return rc; |
---|
175 | } |
---|
176 | |
---|
177 | int |
---|
178 | rtems_rfs_inode_create (rtems_rfs_file_system* fs, |
---|
179 | rtems_rfs_ino parent, |
---|
180 | const char* name, |
---|
181 | size_t length, |
---|
182 | uint16_t mode, |
---|
183 | uint16_t links, |
---|
184 | uid_t uid, |
---|
185 | gid_t gid, |
---|
186 | rtems_rfs_ino* ino) |
---|
187 | { |
---|
188 | rtems_rfs_inode_handle parent_inode; |
---|
189 | rtems_rfs_inode_handle inode; |
---|
190 | int rc; |
---|
191 | |
---|
192 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_CREATE)) |
---|
193 | { |
---|
194 | const char* type = "unknown"; |
---|
195 | int c; |
---|
196 | if (RTEMS_RFS_S_ISDIR (mode)) |
---|
197 | type = "dir"; |
---|
198 | else if (RTEMS_RFS_S_ISCHR (mode)) |
---|
199 | type = "char"; |
---|
200 | else if (RTEMS_RFS_S_ISBLK (mode)) |
---|
201 | type = "block"; |
---|
202 | else if (RTEMS_RFS_S_ISREG (mode)) |
---|
203 | type = "file"; |
---|
204 | else if (RTEMS_RFS_S_ISLNK (mode)) |
---|
205 | type = "link"; |
---|
206 | printf("rtems-rfs: inode-create: parent:%" PRIu32 " name:", parent); |
---|
207 | for (c = 0; c < length; c++) |
---|
208 | printf ("%c", name[c]); |
---|
209 | printf (" type:%s mode:%04x (%03o)\n", type, mode, mode & ((1 << 10) - 1)); |
---|
210 | } |
---|
211 | |
---|
212 | /* |
---|
213 | * The file type is field within the mode. Check we have a sane mode set. |
---|
214 | */ |
---|
215 | switch (mode & RTEMS_RFS_S_IFMT) |
---|
216 | { |
---|
217 | case RTEMS_RFS_S_IFDIR: |
---|
218 | case RTEMS_RFS_S_IFCHR: |
---|
219 | case RTEMS_RFS_S_IFBLK: |
---|
220 | case RTEMS_RFS_S_IFREG: |
---|
221 | case RTEMS_RFS_S_IFLNK: |
---|
222 | break; |
---|
223 | default: |
---|
224 | return EINVAL; |
---|
225 | } |
---|
226 | |
---|
227 | rc = rtems_rfs_inode_alloc (fs, parent, ino); |
---|
228 | if (rc > 0) |
---|
229 | return rc; |
---|
230 | |
---|
231 | rc = rtems_rfs_inode_open (fs, *ino, &inode, true); |
---|
232 | if (rc > 0) |
---|
233 | { |
---|
234 | rtems_rfs_inode_free (fs, *ino); |
---|
235 | return rc; |
---|
236 | } |
---|
237 | |
---|
238 | rc = rtems_rfs_inode_initialise (&inode, links, mode, uid, gid); |
---|
239 | if (rc > 0) |
---|
240 | { |
---|
241 | rtems_rfs_inode_close (fs, &inode); |
---|
242 | rtems_rfs_inode_free (fs, *ino); |
---|
243 | return rc; |
---|
244 | } |
---|
245 | |
---|
246 | /* |
---|
247 | * Only handle the specifics of a directory. Let caller handle the others. |
---|
248 | * |
---|
249 | * The inode delete will free the inode. |
---|
250 | */ |
---|
251 | if (RTEMS_RFS_S_ISDIR (mode)) |
---|
252 | { |
---|
253 | rc = rtems_rfs_dir_add_entry (fs, &inode, ".", 1, *ino); |
---|
254 | if (rc == 0) |
---|
255 | rc = rtems_rfs_dir_add_entry (fs, &inode, "..", 2, parent); |
---|
256 | if (rc > 0) |
---|
257 | { |
---|
258 | rtems_rfs_inode_delete (fs, &inode); |
---|
259 | rtems_rfs_inode_close (fs, &inode); |
---|
260 | return rc; |
---|
261 | } |
---|
262 | } |
---|
263 | |
---|
264 | rc = rtems_rfs_inode_open (fs, parent, &parent_inode, true); |
---|
265 | if (rc > 0) |
---|
266 | { |
---|
267 | rtems_rfs_inode_delete (fs, &inode); |
---|
268 | rtems_rfs_inode_close (fs, &inode); |
---|
269 | return rc; |
---|
270 | } |
---|
271 | |
---|
272 | rc = rtems_rfs_dir_add_entry (fs, &parent_inode, name, length, *ino); |
---|
273 | if (rc > 0) |
---|
274 | { |
---|
275 | rtems_rfs_inode_delete (fs, &inode); |
---|
276 | rtems_rfs_inode_close (fs, &inode); |
---|
277 | rtems_rfs_inode_close (fs, &parent_inode); |
---|
278 | return rc; |
---|
279 | } |
---|
280 | |
---|
281 | /* |
---|
282 | * If the node is a directory update the parent link count as the |
---|
283 | * new directory has the '..' link that points to the parent. |
---|
284 | */ |
---|
285 | if (RTEMS_RFS_S_ISDIR (mode)) |
---|
286 | rtems_rfs_inode_set_links (&parent_inode, |
---|
287 | rtems_rfs_inode_get_links (&parent_inode) + 1); |
---|
288 | |
---|
289 | /* |
---|
290 | * Update the parent's mtime. |
---|
291 | */ |
---|
292 | rc = rtems_rfs_inode_time_stamp_now (&parent_inode, true, true); |
---|
293 | if (rc > 0) |
---|
294 | { |
---|
295 | rtems_rfs_inode_delete (fs, &inode); |
---|
296 | rtems_rfs_inode_close (fs, &inode); |
---|
297 | return rc; |
---|
298 | } |
---|
299 | |
---|
300 | rc = rtems_rfs_inode_close (fs, &parent_inode); |
---|
301 | if (rc > 0) |
---|
302 | { |
---|
303 | rtems_rfs_inode_delete (fs, &inode); |
---|
304 | rtems_rfs_inode_close (fs, &inode); |
---|
305 | return rc; |
---|
306 | } |
---|
307 | |
---|
308 | rc = rtems_rfs_inode_close (fs, &inode); |
---|
309 | if (rc > 0) |
---|
310 | { |
---|
311 | rtems_rfs_inode_free (fs, *ino); |
---|
312 | return rc; |
---|
313 | } |
---|
314 | |
---|
315 | return 0; |
---|
316 | } |
---|
317 | |
---|
318 | int |
---|
319 | rtems_rfs_inode_delete (rtems_rfs_file_system* fs, |
---|
320 | rtems_rfs_inode_handle* handle) |
---|
321 | { |
---|
322 | int rc = 0; |
---|
323 | |
---|
324 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_INODE_DELETE)) |
---|
325 | printf("rtems-rfs: inode-delete: ino:%" PRIu32 " loaded:%s\n", |
---|
326 | rtems_rfs_inode_ino (handle), |
---|
327 | rtems_rfs_inode_is_loaded (handle) ? "yes" : "no"); |
---|
328 | |
---|
329 | if (rtems_rfs_inode_is_loaded (handle)) |
---|
330 | { |
---|
331 | rtems_rfs_block_map map; |
---|
332 | |
---|
333 | /* |
---|
334 | * Free the ino number. |
---|
335 | */ |
---|
336 | rc = rtems_rfs_inode_free (fs, handle->ino); |
---|
337 | if (rc > 0) |
---|
338 | return rc; |
---|
339 | |
---|
340 | /* |
---|
341 | * Free the blocks the inode may have attached. |
---|
342 | */ |
---|
343 | rc = rtems_rfs_block_map_open (fs, handle, &map); |
---|
344 | if (rc == 0) |
---|
345 | { |
---|
346 | int rrc; |
---|
347 | rrc = rtems_rfs_block_map_free_all (fs, &map); |
---|
348 | rc = rtems_rfs_block_map_close (fs, &map); |
---|
349 | if (rc > 0) |
---|
350 | rrc = rc; |
---|
351 | memset (handle->node, 0xff, RTEMS_RFS_INODE_SIZE); |
---|
352 | rtems_rfs_buffer_mark_dirty (&handle->buffer); |
---|
353 | /* |
---|
354 | * Do the release here to avoid the ctime field being set on a |
---|
355 | * close. Also if the loads is greater then one then other loads |
---|
356 | * active. Forcing the loads count to 0. |
---|
357 | */ |
---|
358 | rc = rtems_rfs_buffer_handle_release (fs, &handle->buffer); |
---|
359 | handle->loads = 0; |
---|
360 | handle->node = NULL; |
---|
361 | /* |
---|
362 | * Return the first error and drop any that followed. |
---|
363 | */ |
---|
364 | if (rrc > 0) |
---|
365 | rc = rrc; |
---|
366 | } |
---|
367 | } |
---|
368 | return rc; |
---|
369 | } |
---|
370 | |
---|
371 | int |
---|
372 | rtems_rfs_inode_initialise (rtems_rfs_inode_handle* handle, |
---|
373 | uint16_t links, |
---|
374 | uint16_t mode, |
---|
375 | uid_t uid, |
---|
376 | gid_t gid) |
---|
377 | { |
---|
378 | int b; |
---|
379 | rtems_rfs_inode_set_links (handle, links); |
---|
380 | rtems_rfs_inode_set_flags (handle, 0); |
---|
381 | rtems_rfs_inode_set_mode (handle, mode); |
---|
382 | rtems_rfs_inode_set_uid_gid (handle, uid, gid); |
---|
383 | rtems_rfs_inode_set_block_offset (handle, 0); |
---|
384 | rtems_rfs_inode_set_block_count (handle, 0); |
---|
385 | for (b = 0; b < RTEMS_RFS_INODE_BLOCKS; b++) |
---|
386 | rtems_rfs_inode_set_block (handle, b, 0); |
---|
387 | rtems_rfs_inode_set_last_map_block (handle, 0); |
---|
388 | rtems_rfs_inode_set_last_data_block (handle, 0); |
---|
389 | return rtems_rfs_inode_time_stamp_now (handle, true, true); |
---|
390 | } |
---|
391 | |
---|
392 | int |
---|
393 | rtems_rfs_inode_time_stamp_now (rtems_rfs_inode_handle* handle, |
---|
394 | bool atime, |
---|
395 | bool mtime) |
---|
396 | { |
---|
397 | time_t now; |
---|
398 | if (!rtems_rfs_inode_is_loaded (handle)) |
---|
399 | return ENXIO; |
---|
400 | now = time (NULL); |
---|
401 | if (atime) |
---|
402 | rtems_rfs_inode_set_atime (handle, now); |
---|
403 | if (mtime) |
---|
404 | rtems_rfs_inode_set_mtime (handle, now); |
---|
405 | return 0; |
---|
406 | } |
---|
407 | |
---|
408 | rtems_rfs_pos |
---|
409 | rtems_rfs_inode_get_size (rtems_rfs_file_system* fs, |
---|
410 | rtems_rfs_inode_handle* handle) |
---|
411 | { |
---|
412 | rtems_rfs_block_size size; |
---|
413 | size.count = rtems_rfs_inode_get_block_count (handle); |
---|
414 | size.offset = rtems_rfs_inode_get_block_offset (handle); |
---|
415 | return rtems_rfs_block_get_size (fs, &size); |
---|
416 | } |
---|