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 File Systems Directory Routines. |
---|
16 | * |
---|
17 | * These functions manage blocks in the directory format. A directory entry is |
---|
18 | * a variable length record in the block. The entry consists of a length, hash |
---|
19 | * and the string. The length allows the next entry to be located and the hash |
---|
20 | * allows a simple check to be performed wihtout a string compare. Directory |
---|
21 | * entries do not span a block and removal of an entry results in the space in |
---|
22 | * the block being compacted and the spare area being initialised to ones. |
---|
23 | * |
---|
24 | * The maximum length can be 1 or 2 bytes depending on the value in the |
---|
25 | * superblock. |
---|
26 | */ |
---|
27 | |
---|
28 | #if HAVE_CONFIG_H |
---|
29 | #include "config.h" |
---|
30 | #endif |
---|
31 | |
---|
32 | #include <rtems/rfs/rtems-rfs-block.h> |
---|
33 | #include <rtems/rfs/rtems-rfs-buffer.h> |
---|
34 | #include <rtems/rfs/rtems-rfs-file-system.h> |
---|
35 | #include <rtems/rfs/rtems-rfs-trace.h> |
---|
36 | #include <rtems/rfs/rtems-rfs-dir.h> |
---|
37 | #include <rtems/rfs/rtems-rfs-dir-hash.h> |
---|
38 | |
---|
39 | /** |
---|
40 | * Validate the directory entry data. |
---|
41 | */ |
---|
42 | #define rtems_rfs_dir_entry_valid(_f, _l, _i) \ |
---|
43 | (((_l) <= RTEMS_RFS_DIR_ENTRY_SIZE) || ((_l) >= rtems_rfs_fs_max_name (_f)) \ |
---|
44 | || (_i < RTEMS_RFS_ROOT_INO) || (_i > rtems_rfs_fs_inodes (_f))) |
---|
45 | |
---|
46 | int |
---|
47 | rtems_rfs_dir_lookup_ino (rtems_rfs_file_system* fs, |
---|
48 | rtems_rfs_inode_handle* inode, |
---|
49 | const char* name, |
---|
50 | int length, |
---|
51 | rtems_rfs_ino* ino, |
---|
52 | uint32_t* offset) |
---|
53 | { |
---|
54 | rtems_rfs_block_map map; |
---|
55 | rtems_rfs_buffer_handle entries; |
---|
56 | int rc; |
---|
57 | |
---|
58 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
59 | { |
---|
60 | int c; |
---|
61 | printf ("rtems-rfs: dir-lookup-ino: lookup ino: root=%ld, path=", |
---|
62 | inode->ino); |
---|
63 | for (c = 0; c < length; c++) |
---|
64 | printf ("%c", name[c]); |
---|
65 | printf (", len=%d\n", length); |
---|
66 | } |
---|
67 | |
---|
68 | *ino = RTEMS_RFS_EMPTY_INO; |
---|
69 | *offset = 0; |
---|
70 | |
---|
71 | rc = rtems_rfs_block_map_open (fs, inode, &map); |
---|
72 | if (rc > 0) |
---|
73 | { |
---|
74 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
75 | printf ("rtems-rfs: dir-lookup-ino: map open failed for ino %lu: %d: %s", |
---|
76 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
77 | return rc; |
---|
78 | } |
---|
79 | |
---|
80 | rc = rtems_rfs_buffer_handle_open (fs, &entries); |
---|
81 | if (rc > 0) |
---|
82 | { |
---|
83 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
84 | printf ("rtems-rfs: dir-lookup-ino: handle open failed for ino %lu: %d: %s", |
---|
85 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
86 | rtems_rfs_block_map_close (fs, &map); |
---|
87 | return rc; |
---|
88 | } |
---|
89 | else |
---|
90 | { |
---|
91 | rtems_rfs_block_no block; |
---|
92 | uint32_t hash; |
---|
93 | |
---|
94 | /* |
---|
95 | * Calculate the hash of the look up string. |
---|
96 | */ |
---|
97 | hash = rtems_rfs_dir_hash (name, length); |
---|
98 | |
---|
99 | /* |
---|
100 | * Locate the first block. The map points to the start after open so just |
---|
101 | * seek 0. If an error the block will be 0. |
---|
102 | */ |
---|
103 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
104 | if (rc > 0) |
---|
105 | { |
---|
106 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
107 | printf ("rtems-rfs: dir-lookup-ino: block map find failed: %d: %s\n", |
---|
108 | rc, strerror (rc)); |
---|
109 | if (rc == ENXIO) |
---|
110 | rc = ENOENT; |
---|
111 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
112 | rtems_rfs_block_map_close (fs, &map); |
---|
113 | return rc; |
---|
114 | } |
---|
115 | |
---|
116 | while ((rc == 0) && block) |
---|
117 | { |
---|
118 | uint8_t* entry; |
---|
119 | |
---|
120 | rc = rtems_rfs_buffer_handle_request (fs, &entries, block, true); |
---|
121 | if (rc > 0) |
---|
122 | { |
---|
123 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
124 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%lu block=%ld: %d: %s\n", |
---|
125 | rtems_rfs_inode_ino (inode), block, rc, strerror (rc)); |
---|
126 | break; |
---|
127 | } |
---|
128 | |
---|
129 | /* |
---|
130 | * Search the block to see if the name matches. A hash of 0xffff or 0x0 |
---|
131 | * means the entry is empty. |
---|
132 | */ |
---|
133 | |
---|
134 | entry = rtems_rfs_buffer_data (&entries); |
---|
135 | |
---|
136 | map.bpos.boff = 0; |
---|
137 | |
---|
138 | while (map.bpos.boff < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
139 | { |
---|
140 | uint32_t ehash; |
---|
141 | int elength; |
---|
142 | |
---|
143 | ehash = rtems_rfs_dir_entry_hash (entry); |
---|
144 | elength = rtems_rfs_dir_entry_length (entry); |
---|
145 | *ino = rtems_rfs_dir_entry_ino (entry); |
---|
146 | |
---|
147 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
148 | break; |
---|
149 | |
---|
150 | if (rtems_rfs_dir_entry_valid (fs, elength, *ino)) |
---|
151 | { |
---|
152 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
153 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
154 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
---|
155 | rtems_rfs_inode_ino (inode), elength, *ino, map.bpos.boff); |
---|
156 | rc = EIO; |
---|
157 | break; |
---|
158 | } |
---|
159 | |
---|
160 | if (ehash == hash) |
---|
161 | { |
---|
162 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_CHECK)) |
---|
163 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
164 | "checking entry for ino %ld: off=%04lx length:%d ino:%d\n", |
---|
165 | rtems_rfs_inode_ino (inode), map.bpos.boff, |
---|
166 | elength, rtems_rfs_dir_entry_ino (entry)); |
---|
167 | |
---|
168 | if (memcmp (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length) == 0) |
---|
169 | { |
---|
170 | *offset = rtems_rfs_block_map_pos (fs, &map); |
---|
171 | |
---|
172 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_FOUND)) |
---|
173 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
174 | "entry found in ino %lu, ino=%lu offset=%lu\n", |
---|
175 | rtems_rfs_inode_ino (inode), *ino, *offset); |
---|
176 | |
---|
177 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
178 | rtems_rfs_block_map_close (fs, &map); |
---|
179 | return 0; |
---|
180 | } |
---|
181 | } |
---|
182 | |
---|
183 | map.bpos.boff += elength; |
---|
184 | entry += elength; |
---|
185 | } |
---|
186 | |
---|
187 | if (rc == 0) |
---|
188 | { |
---|
189 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
190 | if ((rc > 0) && (rc != ENXIO)) |
---|
191 | { |
---|
192 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
193 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
194 | "block map next block failed in ino %lu: %d: %s\n", |
---|
195 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
196 | } |
---|
197 | if (rc == ENXIO) |
---|
198 | rc = ENOENT; |
---|
199 | } |
---|
200 | } |
---|
201 | |
---|
202 | if ((rc == 0) && (block == 0)) |
---|
203 | { |
---|
204 | rc = EIO; |
---|
205 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
206 | printf ("rtems-rfs: dir-lookup-ino: block is 0 in ino %lu: %d: %s\n", |
---|
207 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
208 | } |
---|
209 | } |
---|
210 | |
---|
211 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
212 | rtems_rfs_block_map_close (fs, &map); |
---|
213 | return rc; |
---|
214 | } |
---|
215 | |
---|
216 | int |
---|
217 | rtems_rfs_dir_add_entry (rtems_rfs_file_system* fs, |
---|
218 | rtems_rfs_inode_handle* dir, |
---|
219 | const char* name, |
---|
220 | size_t length, |
---|
221 | rtems_rfs_ino ino) |
---|
222 | { |
---|
223 | rtems_rfs_block_map map; |
---|
224 | rtems_rfs_block_pos bpos; |
---|
225 | rtems_rfs_buffer_handle buffer; |
---|
226 | int rc; |
---|
227 | |
---|
228 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
229 | { |
---|
230 | int c; |
---|
231 | printf ("rtems-rfs: dir-add-entry: dir=%ld, name=", |
---|
232 | rtems_rfs_inode_ino (dir)); |
---|
233 | for (c = 0; c < length; c++) |
---|
234 | printf ("%c", name[c]); |
---|
235 | printf (", len=%zd\n", length); |
---|
236 | } |
---|
237 | |
---|
238 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
239 | if (rc > 0) |
---|
240 | return rc; |
---|
241 | |
---|
242 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
243 | if (rc > 0) |
---|
244 | { |
---|
245 | rtems_rfs_block_map_close (fs, &map); |
---|
246 | return rc; |
---|
247 | } |
---|
248 | |
---|
249 | /* |
---|
250 | * Search the map from the beginning to find any empty space. |
---|
251 | */ |
---|
252 | rtems_rfs_block_set_bpos_zero (&bpos); |
---|
253 | |
---|
254 | while (true) |
---|
255 | { |
---|
256 | rtems_rfs_block_no block; |
---|
257 | uint8_t* entry; |
---|
258 | int offset; |
---|
259 | bool read = true; |
---|
260 | |
---|
261 | /* |
---|
262 | * Locate the first block. If an error the block will be 0. If the map is |
---|
263 | * empty which happens when creating a directory and adding the first entry |
---|
264 | * the seek will return ENXIO. In this case we need to grow the directory. |
---|
265 | */ |
---|
266 | rc = rtems_rfs_block_map_find (fs, &map, &bpos, &block); |
---|
267 | if (rc > 0) |
---|
268 | { |
---|
269 | if (rc != ENXIO) |
---|
270 | { |
---|
271 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
272 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
273 | "block map find failed for ino %lu: %d: %s\n", |
---|
274 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
275 | break; |
---|
276 | } |
---|
277 | |
---|
278 | /* |
---|
279 | * We have reached the end of the directory so add a block. |
---|
280 | */ |
---|
281 | rc = rtems_rfs_block_map_grow (fs, &map, 1, &block); |
---|
282 | if (rc > 0) |
---|
283 | { |
---|
284 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
285 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
286 | "block map grow failed for ino %lu: %d: %s\n", |
---|
287 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
288 | break; |
---|
289 | } |
---|
290 | |
---|
291 | read = false; |
---|
292 | } |
---|
293 | |
---|
294 | bpos.bno++; |
---|
295 | |
---|
296 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, read); |
---|
297 | if (rc > 0) |
---|
298 | { |
---|
299 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
300 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
301 | "block buffer req failed for ino %lu: %d: %s\n", |
---|
302 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
303 | break; |
---|
304 | } |
---|
305 | |
---|
306 | entry = rtems_rfs_buffer_data (&buffer); |
---|
307 | |
---|
308 | if (!read) |
---|
309 | memset (entry, 0xff, rtems_rfs_fs_block_size (fs)); |
---|
310 | |
---|
311 | offset = 0; |
---|
312 | |
---|
313 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
314 | { |
---|
315 | rtems_rfs_ino eino; |
---|
316 | int elength; |
---|
317 | |
---|
318 | elength = rtems_rfs_dir_entry_length (entry); |
---|
319 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
320 | |
---|
321 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
322 | { |
---|
323 | if ((length + RTEMS_RFS_DIR_ENTRY_SIZE) < |
---|
324 | (rtems_rfs_fs_block_size (fs) - offset)) |
---|
325 | { |
---|
326 | uint32_t hash; |
---|
327 | hash = rtems_rfs_dir_hash (name, length); |
---|
328 | rtems_rfs_dir_set_entry_hash (entry, hash); |
---|
329 | rtems_rfs_dir_set_entry_ino (entry, ino); |
---|
330 | rtems_rfs_dir_set_entry_length (entry, |
---|
331 | RTEMS_RFS_DIR_ENTRY_SIZE + length); |
---|
332 | memcpy (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length); |
---|
333 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
334 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
335 | rtems_rfs_block_map_close (fs, &map); |
---|
336 | return 0; |
---|
337 | } |
---|
338 | |
---|
339 | break; |
---|
340 | } |
---|
341 | |
---|
342 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
343 | { |
---|
344 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
345 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
346 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
347 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
348 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
349 | rtems_rfs_block_map_close (fs, &map); |
---|
350 | return EIO; |
---|
351 | } |
---|
352 | |
---|
353 | entry += elength; |
---|
354 | offset += elength; |
---|
355 | } |
---|
356 | } |
---|
357 | |
---|
358 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
359 | rtems_rfs_block_map_close (fs, &map); |
---|
360 | return rc; |
---|
361 | } |
---|
362 | |
---|
363 | int |
---|
364 | rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs, |
---|
365 | rtems_rfs_inode_handle* dir, |
---|
366 | rtems_rfs_ino ino, |
---|
367 | uint32_t offset) |
---|
368 | { |
---|
369 | rtems_rfs_block_map map; |
---|
370 | rtems_rfs_block_no block; |
---|
371 | rtems_rfs_buffer_handle buffer; |
---|
372 | bool search; |
---|
373 | int rc; |
---|
374 | |
---|
375 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
376 | printf ("rtems-rfs: dir-del-entry: dir=%ld, entry=%ld offset=%lu\n", |
---|
377 | rtems_rfs_inode_ino (dir), ino, offset); |
---|
378 | |
---|
379 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
380 | if (rc > 0) |
---|
381 | return rc; |
---|
382 | |
---|
383 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
384 | if (rc > 0) |
---|
385 | { |
---|
386 | if (rc == ENXIO) |
---|
387 | rc = ENOENT; |
---|
388 | rtems_rfs_block_map_close (fs, &map); |
---|
389 | return rc; |
---|
390 | } |
---|
391 | |
---|
392 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
393 | if (rc > 0) |
---|
394 | { |
---|
395 | rtems_rfs_block_map_close (fs, &map); |
---|
396 | return rc; |
---|
397 | } |
---|
398 | |
---|
399 | /* |
---|
400 | * Only search if the offset is 0 else we are at that position. |
---|
401 | */ |
---|
402 | search = offset ? false : true; |
---|
403 | |
---|
404 | while (rc == 0) |
---|
405 | { |
---|
406 | uint8_t* entry; |
---|
407 | int offset; |
---|
408 | |
---|
409 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
410 | if (rc > 0) |
---|
411 | { |
---|
412 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
413 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
414 | "block buffer req failed for ino %lu: %d: %s\n", |
---|
415 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
416 | break; |
---|
417 | } |
---|
418 | |
---|
419 | entry = rtems_rfs_buffer_data (&buffer); |
---|
420 | offset = 0; |
---|
421 | |
---|
422 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
423 | { |
---|
424 | rtems_rfs_ino eino; |
---|
425 | int elength; |
---|
426 | |
---|
427 | elength = rtems_rfs_dir_entry_length (entry); |
---|
428 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
429 | |
---|
430 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
431 | break; |
---|
432 | |
---|
433 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
434 | { |
---|
435 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
436 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
437 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
438 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
439 | rc = EIO; |
---|
440 | break; |
---|
441 | } |
---|
442 | |
---|
443 | if (ino == rtems_rfs_dir_entry_ino (entry)) |
---|
444 | { |
---|
445 | uint32_t remaining; |
---|
446 | remaining = rtems_rfs_fs_block_size (fs) - (offset + elength); |
---|
447 | memmove (entry, entry + elength, remaining); |
---|
448 | memset (entry + remaining, 0xff, elength); |
---|
449 | |
---|
450 | /* |
---|
451 | * If the remainder of the block is empty and this is the start of the |
---|
452 | * block and it is the last block in the map shrink the map. |
---|
453 | * |
---|
454 | * @note We could check again to see if the new end block in the map is |
---|
455 | * also empty. This way we could clean up an empty directory. |
---|
456 | */ |
---|
457 | elength = rtems_rfs_dir_entry_length (entry); |
---|
458 | |
---|
459 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
460 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
461 | "last block free for ino %lu: elength=%i offset=%d last=%s\n", |
---|
462 | ino, elength, offset, |
---|
463 | rtems_rfs_block_map_last (&map) ? "yes" : "no"); |
---|
464 | |
---|
465 | if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) && |
---|
466 | (offset == 0) && rtems_rfs_block_map_last (&map)) |
---|
467 | { |
---|
468 | rc = rtems_rfs_block_map_shrink (fs, &map, 1); |
---|
469 | if (rc > 0) |
---|
470 | { |
---|
471 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
472 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
473 | "block map shrink failed for ino %lu: %d: %s\n", |
---|
474 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
475 | } |
---|
476 | } |
---|
477 | |
---|
478 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
479 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
480 | rtems_rfs_block_map_close (fs, &map); |
---|
481 | return 0; |
---|
482 | } |
---|
483 | |
---|
484 | if (!search) |
---|
485 | { |
---|
486 | rc = EIO; |
---|
487 | break; |
---|
488 | } |
---|
489 | |
---|
490 | entry += elength; |
---|
491 | offset += elength; |
---|
492 | } |
---|
493 | |
---|
494 | if (rc == 0) |
---|
495 | { |
---|
496 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
497 | if (rc == ENXIO) |
---|
498 | rc = ENOENT; |
---|
499 | } |
---|
500 | } |
---|
501 | |
---|
502 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
503 | rtems_rfs_block_map_close (fs, &map); |
---|
504 | return rc; |
---|
505 | } |
---|
506 | |
---|
507 | int |
---|
508 | rtems_rfs_dir_read (rtems_rfs_file_system* fs, |
---|
509 | rtems_rfs_inode_handle* dir, |
---|
510 | rtems_rfs_pos_rel offset, |
---|
511 | struct dirent* dirent, |
---|
512 | size_t* length) |
---|
513 | { |
---|
514 | rtems_rfs_block_map map; |
---|
515 | rtems_rfs_buffer_handle buffer; |
---|
516 | rtems_rfs_block_no block; |
---|
517 | int rc; |
---|
518 | |
---|
519 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
520 | printf ("rtems-rfs: dir-read: dir=%ld offset=%Ld\n", |
---|
521 | rtems_rfs_inode_ino (dir), offset); |
---|
522 | |
---|
523 | *length = 0; |
---|
524 | |
---|
525 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
526 | if (rc > 0) |
---|
527 | return rc; |
---|
528 | |
---|
529 | if (((rtems_rfs_fs_block_size (fs) - |
---|
530 | (offset % rtems_rfs_fs_block_size (fs))) <= RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
531 | offset = (((offset / rtems_rfs_fs_block_size (fs)) + 1) * |
---|
532 | rtems_rfs_fs_block_size (fs)); |
---|
533 | |
---|
534 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
535 | if (rc > 0) |
---|
536 | { |
---|
537 | if (rc == ENXIO) |
---|
538 | rc = ENOENT; |
---|
539 | rtems_rfs_block_map_close (fs, &map); |
---|
540 | return rc; |
---|
541 | } |
---|
542 | |
---|
543 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
544 | if (rc > 0) |
---|
545 | { |
---|
546 | rtems_rfs_block_map_close (fs, &map); |
---|
547 | return rc; |
---|
548 | } |
---|
549 | |
---|
550 | /* |
---|
551 | * Look for an empty entry and if this is the last block that is the end of |
---|
552 | * the directory. |
---|
553 | */ |
---|
554 | while (rc == 0) |
---|
555 | { |
---|
556 | uint8_t* entry; |
---|
557 | rtems_rfs_ino eino; |
---|
558 | int elength; |
---|
559 | int remaining; |
---|
560 | |
---|
561 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
562 | if (rc > 0) |
---|
563 | { |
---|
564 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
565 | rtems_rfs_block_map_close (fs, &map); |
---|
566 | return rc; |
---|
567 | } |
---|
568 | |
---|
569 | entry = rtems_rfs_buffer_data (&buffer); |
---|
570 | entry += map.bpos.boff; |
---|
571 | |
---|
572 | elength = rtems_rfs_dir_entry_length (entry); |
---|
573 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
574 | |
---|
575 | if (elength != RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
576 | { |
---|
577 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
578 | { |
---|
579 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
580 | printf ("rtems-rfs: dir-read: " \ |
---|
581 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
---|
582 | rtems_rfs_inode_ino (dir), elength, eino, map.bpos.boff); |
---|
583 | rc = EIO; |
---|
584 | break; |
---|
585 | } |
---|
586 | |
---|
587 | memset (dirent, 0, sizeof (struct dirent)); |
---|
588 | dirent->d_off = offset; |
---|
589 | dirent->d_reclen = sizeof (struct dirent); |
---|
590 | |
---|
591 | *length += elength; |
---|
592 | |
---|
593 | remaining = rtems_rfs_fs_block_size (fs) - (map.bpos.boff + elength); |
---|
594 | |
---|
595 | if (remaining <= RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
596 | *length += remaining; |
---|
597 | |
---|
598 | if (elength < RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
599 | elength = 0; |
---|
600 | else |
---|
601 | elength -= RTEMS_RFS_DIR_ENTRY_SIZE; |
---|
602 | if (elength > NAME_MAX) |
---|
603 | elength = NAME_MAX; |
---|
604 | |
---|
605 | memcpy (dirent->d_name, entry + RTEMS_RFS_DIR_ENTRY_SIZE, elength); |
---|
606 | |
---|
607 | dirent->d_ino = rtems_rfs_dir_entry_ino (entry); |
---|
608 | dirent->d_namlen = elength; |
---|
609 | |
---|
610 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
611 | printf ("rtems-rfs: dir-read: found off:%Ld ino:%ld name=%s\n", |
---|
612 | dirent->d_off, dirent->d_ino, dirent->d_name); |
---|
613 | break; |
---|
614 | } |
---|
615 | |
---|
616 | *length += rtems_rfs_fs_block_size (fs) - map.bpos.boff; |
---|
617 | |
---|
618 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
619 | printf ("rtems-rfs: dir-read: next block: off:%ld length:%zd\n", |
---|
620 | (uint32_t) offset, *length); |
---|
621 | |
---|
622 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
623 | if (rc == ENXIO) |
---|
624 | rc = ENOENT; |
---|
625 | } |
---|
626 | |
---|
627 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
628 | rtems_rfs_block_map_close (fs, &map); |
---|
629 | return rc; |
---|
630 | } |
---|
631 | |
---|
632 | int |
---|
633 | rtems_rfs_dir_empty (rtems_rfs_file_system* fs, |
---|
634 | rtems_rfs_inode_handle* dir) |
---|
635 | { |
---|
636 | rtems_rfs_block_map map; |
---|
637 | rtems_rfs_buffer_handle buffer; |
---|
638 | rtems_rfs_block_no block; |
---|
639 | bool empty; |
---|
640 | int rc; |
---|
641 | |
---|
642 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
643 | printf ("rtems-rfs: dir-empty: dir=%ld\n", rtems_rfs_inode_ino (dir)); |
---|
644 | |
---|
645 | empty = true; |
---|
646 | |
---|
647 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
648 | if (rc > 0) |
---|
649 | return rc; |
---|
650 | |
---|
651 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
652 | if (rc > 0) |
---|
653 | { |
---|
654 | rtems_rfs_block_map_close (fs, &map); |
---|
655 | return rc; |
---|
656 | } |
---|
657 | |
---|
658 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
659 | if (rc > 0) |
---|
660 | { |
---|
661 | rtems_rfs_block_map_close (fs, &map); |
---|
662 | return rc; |
---|
663 | } |
---|
664 | |
---|
665 | /* |
---|
666 | * Look for an empty entry and if this is the last block that is the end of |
---|
667 | * the directory. |
---|
668 | */ |
---|
669 | while (empty) |
---|
670 | { |
---|
671 | uint8_t* entry; |
---|
672 | int offset; |
---|
673 | |
---|
674 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
675 | if (rc > 0) |
---|
676 | break; |
---|
677 | |
---|
678 | entry = rtems_rfs_buffer_data (&buffer); |
---|
679 | offset = 0; |
---|
680 | |
---|
681 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
682 | { |
---|
683 | rtems_rfs_ino eino; |
---|
684 | int elength; |
---|
685 | |
---|
686 | elength = rtems_rfs_dir_entry_length (entry); |
---|
687 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
688 | |
---|
689 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
690 | break; |
---|
691 | |
---|
692 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
693 | { |
---|
694 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_EMPTY)) |
---|
695 | printf ("rtems-rfs: dir-empty: " \ |
---|
696 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
697 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
698 | rc = EIO; |
---|
699 | break; |
---|
700 | } |
---|
701 | |
---|
702 | /* |
---|
703 | * Ignore the current (.) and parent (..) entries. Anything else means |
---|
704 | * the directory is not empty. |
---|
705 | */ |
---|
706 | if (((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 1)) || |
---|
707 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.')) && |
---|
708 | ((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 2)) || |
---|
709 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.') || |
---|
710 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE + 1] != '.'))) |
---|
711 | { |
---|
712 | empty = false; |
---|
713 | break; |
---|
714 | } |
---|
715 | |
---|
716 | entry += elength; |
---|
717 | offset += elength; |
---|
718 | } |
---|
719 | |
---|
720 | if (empty) |
---|
721 | { |
---|
722 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
723 | if (rc > 0) |
---|
724 | { |
---|
725 | if (rc == ENXIO) |
---|
726 | rc = 0; |
---|
727 | break; |
---|
728 | } |
---|
729 | } |
---|
730 | } |
---|
731 | |
---|
732 | if ((rc == 0) && !empty) |
---|
733 | rc = ENOTEMPTY; |
---|
734 | |
---|
735 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
736 | rtems_rfs_block_map_close (fs, &map); |
---|
737 | return rc; |
---|
738 | } |
---|