1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief RTEMS File Systems Directory Routines |
---|
5 | * @ingroup rtems_rfs |
---|
6 | * |
---|
7 | * These functions manage blocks in the directory format. A directory entry is |
---|
8 | * a variable length record in the block. The entry consists of a length, hash |
---|
9 | * and the string. The length allows the next entry to be located and the hash |
---|
10 | * allows a simple check to be performed wihtout a string compare. Directory |
---|
11 | * entries do not span a block and removal of an entry results in the space in |
---|
12 | * the block being compacted and the spare area being initialised to ones. |
---|
13 | * |
---|
14 | * The maximum length can be 1 or 2 bytes depending on the value in the |
---|
15 | * superblock. |
---|
16 | */ |
---|
17 | |
---|
18 | /* |
---|
19 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
---|
20 | * |
---|
21 | * The license and distribution terms for this file may be |
---|
22 | * found in the file LICENSE in this distribution or at |
---|
23 | * http://www.rtems.org/license/LICENSE. |
---|
24 | */ |
---|
25 | |
---|
26 | #if HAVE_CONFIG_H |
---|
27 | #include "config.h" |
---|
28 | #endif |
---|
29 | |
---|
30 | #include <inttypes.h> |
---|
31 | #include <string.h> |
---|
32 | |
---|
33 | #if SIZEOF_OFF_T == 8 |
---|
34 | #define PRIooff_t PRIo64 |
---|
35 | #elif SIZEOF_OFF_T == 4 |
---|
36 | #define PRIooff_t PRIo32 |
---|
37 | #else |
---|
38 | #error "unsupported size of off_t" |
---|
39 | #endif |
---|
40 | |
---|
41 | #include <rtems/rfs/rtems-rfs-block.h> |
---|
42 | #include <rtems/rfs/rtems-rfs-buffer.h> |
---|
43 | #include <rtems/rfs/rtems-rfs-file-system.h> |
---|
44 | #include <rtems/rfs/rtems-rfs-trace.h> |
---|
45 | #include <rtems/rfs/rtems-rfs-dir.h> |
---|
46 | #include <rtems/rfs/rtems-rfs-dir-hash.h> |
---|
47 | |
---|
48 | /** |
---|
49 | * Validate the directory entry data. |
---|
50 | */ |
---|
51 | #define rtems_rfs_dir_entry_valid(_f, _l, _i) \ |
---|
52 | (((_l) <= RTEMS_RFS_DIR_ENTRY_SIZE) || ((_l) >= rtems_rfs_fs_max_name (_f)) \ |
---|
53 | || (_i < RTEMS_RFS_ROOT_INO) || (_i > rtems_rfs_fs_inodes (_f))) |
---|
54 | |
---|
55 | int |
---|
56 | rtems_rfs_dir_lookup_ino (rtems_rfs_file_system* fs, |
---|
57 | rtems_rfs_inode_handle* inode, |
---|
58 | const char* name, |
---|
59 | int length, |
---|
60 | rtems_rfs_ino* ino, |
---|
61 | uint32_t* offset) |
---|
62 | { |
---|
63 | rtems_rfs_block_map map; |
---|
64 | rtems_rfs_buffer_handle entries; |
---|
65 | int rc; |
---|
66 | |
---|
67 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
68 | { |
---|
69 | int c; |
---|
70 | printf ("rtems-rfs: dir-lookup-ino: lookup ino: root=%" PRId32 ", path=", |
---|
71 | inode->ino); |
---|
72 | for (c = 0; c < length; c++) |
---|
73 | printf ("%c", name[c]); |
---|
74 | printf (", len=%d\n", length); |
---|
75 | } |
---|
76 | |
---|
77 | *ino = RTEMS_RFS_EMPTY_INO; |
---|
78 | *offset = 0; |
---|
79 | |
---|
80 | rc = rtems_rfs_block_map_open (fs, inode, &map); |
---|
81 | if (rc > 0) |
---|
82 | { |
---|
83 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
84 | printf ("rtems-rfs: dir-lookup-ino: map open failed for ino %" PRIu32 ": %d: %s", |
---|
85 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
86 | return rc; |
---|
87 | } |
---|
88 | |
---|
89 | rc = rtems_rfs_buffer_handle_open (fs, &entries); |
---|
90 | if (rc > 0) |
---|
91 | { |
---|
92 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
93 | printf ("rtems-rfs: dir-lookup-ino: handle open failed for ino %" PRIu32 ": %d: %s", |
---|
94 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
95 | rtems_rfs_block_map_close (fs, &map); |
---|
96 | return rc; |
---|
97 | } |
---|
98 | else |
---|
99 | { |
---|
100 | rtems_rfs_block_no block; |
---|
101 | uint32_t hash; |
---|
102 | |
---|
103 | /* |
---|
104 | * Calculate the hash of the look up string. |
---|
105 | */ |
---|
106 | hash = rtems_rfs_dir_hash (name, length); |
---|
107 | |
---|
108 | /* |
---|
109 | * Locate the first block. The map points to the start after open so just |
---|
110 | * seek 0. If an error the block will be 0. |
---|
111 | */ |
---|
112 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
113 | if (rc > 0) |
---|
114 | { |
---|
115 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
116 | printf ("rtems-rfs: dir-lookup-ino: block map find failed: %d: %s\n", |
---|
117 | rc, strerror (rc)); |
---|
118 | if (rc == ENXIO) |
---|
119 | rc = ENOENT; |
---|
120 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
121 | rtems_rfs_block_map_close (fs, &map); |
---|
122 | return rc; |
---|
123 | } |
---|
124 | |
---|
125 | while ((rc == 0) && block) |
---|
126 | { |
---|
127 | uint8_t* entry; |
---|
128 | |
---|
129 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
130 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%" PRIu32 " bno=%" PRId32 "\n", |
---|
131 | rtems_rfs_inode_ino (inode), map.bpos.bno); |
---|
132 | |
---|
133 | rc = rtems_rfs_buffer_handle_request (fs, &entries, block, true); |
---|
134 | if (rc > 0) |
---|
135 | { |
---|
136 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
137 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%" PRIu32 " block=%" PRId32 ": %d: %s\n", |
---|
138 | rtems_rfs_inode_ino (inode), block, rc, strerror (rc)); |
---|
139 | break; |
---|
140 | } |
---|
141 | |
---|
142 | /* |
---|
143 | * Search the block to see if the name matches. A hash of 0xffff or 0x0 |
---|
144 | * means the entry is empty. |
---|
145 | */ |
---|
146 | |
---|
147 | entry = rtems_rfs_buffer_data (&entries); |
---|
148 | |
---|
149 | map.bpos.boff = 0; |
---|
150 | |
---|
151 | while (map.bpos.boff < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
152 | { |
---|
153 | uint32_t ehash; |
---|
154 | int elength; |
---|
155 | |
---|
156 | ehash = rtems_rfs_dir_entry_hash (entry); |
---|
157 | elength = rtems_rfs_dir_entry_length (entry); |
---|
158 | *ino = rtems_rfs_dir_entry_ino (entry); |
---|
159 | |
---|
160 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
161 | break; |
---|
162 | |
---|
163 | if (rtems_rfs_dir_entry_valid (fs, elength, *ino)) |
---|
164 | { |
---|
165 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
166 | printf ("rtems-rfs: dir-lookup-ino: " |
---|
167 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04" PRIx32 "\n", |
---|
168 | rtems_rfs_inode_ino (inode), elength, *ino, map.bpos.boff); |
---|
169 | rc = EIO; |
---|
170 | break; |
---|
171 | } |
---|
172 | |
---|
173 | if (ehash == hash) |
---|
174 | { |
---|
175 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_CHECK)) |
---|
176 | printf ("rtems-rfs: dir-lookup-ino: " |
---|
177 | "checking entry for ino %" PRId32 ": bno=%04" PRIx32 "/off=%04" PRIx32 |
---|
178 | " length:%d ino:%" PRId32 "\n", |
---|
179 | rtems_rfs_inode_ino (inode), map.bpos.bno, map.bpos.boff, |
---|
180 | elength, rtems_rfs_dir_entry_ino (entry)); |
---|
181 | |
---|
182 | if (memcmp (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length) == 0) |
---|
183 | { |
---|
184 | *offset = rtems_rfs_block_map_pos (fs, &map); |
---|
185 | |
---|
186 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_FOUND)) |
---|
187 | printf ("rtems-rfs: dir-lookup-ino: " |
---|
188 | "entry found in ino %" PRIu32 ", ino=%" PRIu32 " offset=%" PRIu32 "\n", |
---|
189 | rtems_rfs_inode_ino (inode), *ino, *offset); |
---|
190 | |
---|
191 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
192 | rtems_rfs_block_map_close (fs, &map); |
---|
193 | return 0; |
---|
194 | } |
---|
195 | } |
---|
196 | |
---|
197 | map.bpos.boff += elength; |
---|
198 | entry += elength; |
---|
199 | } |
---|
200 | |
---|
201 | if (rc == 0) |
---|
202 | { |
---|
203 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
204 | if ((rc > 0) && (rc != ENXIO)) |
---|
205 | { |
---|
206 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
207 | printf ("rtems-rfs: dir-lookup-ino: " |
---|
208 | "block map next block failed in ino %" PRIu32 ": %d: %s\n", |
---|
209 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
210 | } |
---|
211 | if (rc == ENXIO) |
---|
212 | rc = ENOENT; |
---|
213 | } |
---|
214 | } |
---|
215 | |
---|
216 | if ((rc == 0) && (block == 0)) |
---|
217 | { |
---|
218 | rc = EIO; |
---|
219 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
220 | printf ("rtems-rfs: dir-lookup-ino: block is 0 in ino %" PRIu32 ": %d: %s\n", |
---|
221 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
222 | } |
---|
223 | } |
---|
224 | |
---|
225 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
226 | rtems_rfs_block_map_close (fs, &map); |
---|
227 | return rc; |
---|
228 | } |
---|
229 | |
---|
230 | int |
---|
231 | rtems_rfs_dir_add_entry (rtems_rfs_file_system* fs, |
---|
232 | rtems_rfs_inode_handle* dir, |
---|
233 | const char* name, |
---|
234 | size_t length, |
---|
235 | rtems_rfs_ino ino) |
---|
236 | { |
---|
237 | rtems_rfs_block_map map; |
---|
238 | rtems_rfs_block_pos bpos; |
---|
239 | rtems_rfs_buffer_handle buffer; |
---|
240 | int rc; |
---|
241 | |
---|
242 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
243 | { |
---|
244 | int c; |
---|
245 | printf ("rtems-rfs: dir-add-entry: dir=%" PRId32 ", name=", |
---|
246 | rtems_rfs_inode_ino (dir)); |
---|
247 | for (c = 0; c < length; c++) |
---|
248 | printf ("%c", name[c]); |
---|
249 | printf (", len=%zd\n", length); |
---|
250 | } |
---|
251 | |
---|
252 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
253 | if (rc > 0) |
---|
254 | return rc; |
---|
255 | |
---|
256 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
257 | if (rc > 0) |
---|
258 | { |
---|
259 | rtems_rfs_block_map_close (fs, &map); |
---|
260 | return rc; |
---|
261 | } |
---|
262 | |
---|
263 | /* |
---|
264 | * Search the map from the beginning to find any empty space. |
---|
265 | */ |
---|
266 | rtems_rfs_block_set_bpos_zero (&bpos); |
---|
267 | |
---|
268 | while (true) |
---|
269 | { |
---|
270 | rtems_rfs_block_no block; |
---|
271 | uint8_t* entry; |
---|
272 | int offset; |
---|
273 | bool read = true; |
---|
274 | |
---|
275 | /* |
---|
276 | * Locate the first block. If an error the block will be 0. If the map is |
---|
277 | * empty which happens when creating a directory and adding the first entry |
---|
278 | * the seek will return ENXIO. In this case we need to grow the directory. |
---|
279 | */ |
---|
280 | rc = rtems_rfs_block_map_find (fs, &map, &bpos, &block); |
---|
281 | if (rc > 0) |
---|
282 | { |
---|
283 | if (rc != ENXIO) |
---|
284 | { |
---|
285 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
286 | printf ("rtems-rfs: dir-add-entry: " |
---|
287 | "block map find failed for ino %" PRIu32 ": %d: %s\n", |
---|
288 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
289 | break; |
---|
290 | } |
---|
291 | |
---|
292 | /* |
---|
293 | * We have reached the end of the directory so add a block. |
---|
294 | */ |
---|
295 | rc = rtems_rfs_block_map_grow (fs, &map, 1, &block); |
---|
296 | if (rc > 0) |
---|
297 | { |
---|
298 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
299 | printf ("rtems-rfs: dir-add-entry: " |
---|
300 | "block map grow failed for ino %" PRIu32 ": %d: %s\n", |
---|
301 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
302 | break; |
---|
303 | } |
---|
304 | |
---|
305 | read = false; |
---|
306 | } |
---|
307 | |
---|
308 | bpos.bno++; |
---|
309 | |
---|
310 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, read); |
---|
311 | if (rc > 0) |
---|
312 | { |
---|
313 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
314 | printf ("rtems-rfs: dir-add-entry: " |
---|
315 | "block buffer req failed for ino %" PRIu32 ": %d: %s\n", |
---|
316 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
317 | break; |
---|
318 | } |
---|
319 | |
---|
320 | entry = rtems_rfs_buffer_data (&buffer); |
---|
321 | |
---|
322 | if (!read) |
---|
323 | memset (entry, 0xff, rtems_rfs_fs_block_size (fs)); |
---|
324 | |
---|
325 | offset = 0; |
---|
326 | |
---|
327 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
328 | { |
---|
329 | rtems_rfs_ino eino; |
---|
330 | int elength; |
---|
331 | |
---|
332 | elength = rtems_rfs_dir_entry_length (entry); |
---|
333 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
334 | |
---|
335 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
336 | { |
---|
337 | if ((length + RTEMS_RFS_DIR_ENTRY_SIZE) < |
---|
338 | (rtems_rfs_fs_block_size (fs) - offset)) |
---|
339 | { |
---|
340 | uint32_t hash; |
---|
341 | hash = rtems_rfs_dir_hash (name, length); |
---|
342 | rtems_rfs_dir_set_entry_hash (entry, hash); |
---|
343 | rtems_rfs_dir_set_entry_ino (entry, ino); |
---|
344 | rtems_rfs_dir_set_entry_length (entry, |
---|
345 | RTEMS_RFS_DIR_ENTRY_SIZE + length); |
---|
346 | memcpy (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length); |
---|
347 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
348 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
349 | rtems_rfs_block_map_close (fs, &map); |
---|
350 | return 0; |
---|
351 | } |
---|
352 | |
---|
353 | break; |
---|
354 | } |
---|
355 | |
---|
356 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
357 | { |
---|
358 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
359 | printf ("rtems-rfs: dir-add-entry: " |
---|
360 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04x\n", |
---|
361 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
362 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
363 | rtems_rfs_block_map_close (fs, &map); |
---|
364 | return EIO; |
---|
365 | } |
---|
366 | |
---|
367 | entry += elength; |
---|
368 | offset += elength; |
---|
369 | } |
---|
370 | } |
---|
371 | |
---|
372 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
373 | rtems_rfs_block_map_close (fs, &map); |
---|
374 | return rc; |
---|
375 | } |
---|
376 | |
---|
377 | int |
---|
378 | rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs, |
---|
379 | rtems_rfs_inode_handle* dir, |
---|
380 | rtems_rfs_ino ino, |
---|
381 | uint32_t offset) |
---|
382 | { |
---|
383 | rtems_rfs_block_map map; |
---|
384 | rtems_rfs_block_no block; |
---|
385 | rtems_rfs_buffer_handle buffer; |
---|
386 | bool search; |
---|
387 | int rc; |
---|
388 | |
---|
389 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
390 | printf ("rtems-rfs: dir-del-entry: dir=%" PRId32 ", entry=%" PRId32 " offset=%" PRIu32 "\n", |
---|
391 | rtems_rfs_inode_ino (dir), ino, offset); |
---|
392 | |
---|
393 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
394 | if (rc > 0) |
---|
395 | return rc; |
---|
396 | |
---|
397 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
398 | if (rc > 0) |
---|
399 | { |
---|
400 | if (rc == ENXIO) |
---|
401 | rc = ENOENT; |
---|
402 | rtems_rfs_block_map_close (fs, &map); |
---|
403 | return rc; |
---|
404 | } |
---|
405 | |
---|
406 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
407 | if (rc > 0) |
---|
408 | { |
---|
409 | rtems_rfs_block_map_close (fs, &map); |
---|
410 | return rc; |
---|
411 | } |
---|
412 | |
---|
413 | /* |
---|
414 | * Only search if the offset is 0 else we are at that position. |
---|
415 | */ |
---|
416 | search = offset ? false : true; |
---|
417 | |
---|
418 | while (rc == 0) |
---|
419 | { |
---|
420 | uint8_t* entry; |
---|
421 | int eoffset; |
---|
422 | |
---|
423 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
424 | if (rc > 0) |
---|
425 | { |
---|
426 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
427 | printf ("rtems-rfs: dir-del-entry: " |
---|
428 | "block buffer req failed for ino %" PRIu32 ": %d: %s\n", |
---|
429 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
430 | break; |
---|
431 | } |
---|
432 | |
---|
433 | /* |
---|
434 | * If we are searching start at the beginning of the block. If not searching |
---|
435 | * skip to the offset in the block. |
---|
436 | */ |
---|
437 | if (search) |
---|
438 | eoffset = 0; |
---|
439 | else |
---|
440 | eoffset = offset % rtems_rfs_fs_block_size (fs); |
---|
441 | |
---|
442 | entry = rtems_rfs_buffer_data (&buffer) + eoffset; |
---|
443 | |
---|
444 | while (eoffset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
445 | { |
---|
446 | rtems_rfs_ino eino; |
---|
447 | int elength; |
---|
448 | |
---|
449 | elength = rtems_rfs_dir_entry_length (entry); |
---|
450 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
451 | |
---|
452 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
453 | break; |
---|
454 | |
---|
455 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
456 | { |
---|
457 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
458 | printf ("rtems-rfs: dir-del-entry: " |
---|
459 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 |
---|
460 | " @ %" PRIu32 ".%04x\n", |
---|
461 | rtems_rfs_inode_ino (dir), elength, eino, block, eoffset); |
---|
462 | rc = EIO; |
---|
463 | break; |
---|
464 | } |
---|
465 | |
---|
466 | if (ino == rtems_rfs_dir_entry_ino (entry)) |
---|
467 | { |
---|
468 | uint32_t remaining; |
---|
469 | remaining = rtems_rfs_fs_block_size (fs) - (eoffset + elength); |
---|
470 | memmove (entry, entry + elength, remaining); |
---|
471 | memset (entry + remaining, 0xff, elength); |
---|
472 | |
---|
473 | /* |
---|
474 | * If the remainder of the block is empty and this is the start of the |
---|
475 | * block and it is the last block in the map shrink the map. |
---|
476 | * |
---|
477 | * @note We could check again to see if the new end block in the map is |
---|
478 | * also empty. This way we could clean up an empty directory. |
---|
479 | */ |
---|
480 | elength = rtems_rfs_dir_entry_length (entry); |
---|
481 | |
---|
482 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
483 | printf ("rtems-rfs: dir-del-entry: " |
---|
484 | "last block free for ino %" PRIu32 ": elength=%i block=%" PRIu32 |
---|
485 | " offset=%d last=%s\n", |
---|
486 | ino, elength, block, eoffset, |
---|
487 | rtems_rfs_block_map_last (&map) ? "yes" : "no"); |
---|
488 | |
---|
489 | if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) && |
---|
490 | (eoffset == 0) && rtems_rfs_block_map_last (&map)) |
---|
491 | { |
---|
492 | rc = rtems_rfs_block_map_shrink (fs, &map, 1); |
---|
493 | if (rc > 0) |
---|
494 | { |
---|
495 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
496 | printf ("rtems-rfs: dir-del-entry: " |
---|
497 | "block map shrink failed for ino %" PRIu32 ": %d: %s\n", |
---|
498 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
499 | } |
---|
500 | } |
---|
501 | |
---|
502 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
503 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
504 | rtems_rfs_block_map_close (fs, &map); |
---|
505 | return 0; |
---|
506 | } |
---|
507 | |
---|
508 | if (!search) |
---|
509 | { |
---|
510 | rc = EIO; |
---|
511 | break; |
---|
512 | } |
---|
513 | |
---|
514 | entry += elength; |
---|
515 | eoffset += elength; |
---|
516 | } |
---|
517 | |
---|
518 | if (rc == 0) |
---|
519 | { |
---|
520 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
521 | if (rc == ENXIO) |
---|
522 | rc = ENOENT; |
---|
523 | } |
---|
524 | } |
---|
525 | |
---|
526 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
527 | rtems_rfs_block_map_close (fs, &map); |
---|
528 | return rc; |
---|
529 | } |
---|
530 | |
---|
531 | int |
---|
532 | rtems_rfs_dir_read (rtems_rfs_file_system* fs, |
---|
533 | rtems_rfs_inode_handle* dir, |
---|
534 | rtems_rfs_pos_rel offset, |
---|
535 | struct dirent* dirent, |
---|
536 | size_t* length) |
---|
537 | { |
---|
538 | rtems_rfs_block_map map; |
---|
539 | rtems_rfs_buffer_handle buffer; |
---|
540 | rtems_rfs_block_no block; |
---|
541 | int rc; |
---|
542 | |
---|
543 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
544 | printf ("rtems-rfs: dir-read: dir=%" PRId32 " offset=%" PRId64 "\n", |
---|
545 | rtems_rfs_inode_ino (dir), offset); |
---|
546 | |
---|
547 | *length = 0; |
---|
548 | |
---|
549 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
550 | if (rc > 0) |
---|
551 | return rc; |
---|
552 | |
---|
553 | if (((rtems_rfs_fs_block_size (fs) - |
---|
554 | (offset % rtems_rfs_fs_block_size (fs))) <= RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
555 | offset = (((offset / rtems_rfs_fs_block_size (fs)) + 1) * |
---|
556 | rtems_rfs_fs_block_size (fs)); |
---|
557 | |
---|
558 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
559 | if (rc > 0) |
---|
560 | { |
---|
561 | if (rc == ENXIO) |
---|
562 | rc = ENOENT; |
---|
563 | rtems_rfs_block_map_close (fs, &map); |
---|
564 | return rc; |
---|
565 | } |
---|
566 | |
---|
567 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
568 | if (rc > 0) |
---|
569 | { |
---|
570 | rtems_rfs_block_map_close (fs, &map); |
---|
571 | return rc; |
---|
572 | } |
---|
573 | |
---|
574 | /* |
---|
575 | * Look for an empty entry and if this is the last block that is the end of |
---|
576 | * the directory. |
---|
577 | */ |
---|
578 | while (rc == 0) |
---|
579 | { |
---|
580 | uint8_t* entry; |
---|
581 | rtems_rfs_ino eino; |
---|
582 | int elength; |
---|
583 | int remaining; |
---|
584 | |
---|
585 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
586 | if (rc > 0) |
---|
587 | { |
---|
588 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
589 | rtems_rfs_block_map_close (fs, &map); |
---|
590 | return rc; |
---|
591 | } |
---|
592 | |
---|
593 | entry = rtems_rfs_buffer_data (&buffer); |
---|
594 | entry += map.bpos.boff; |
---|
595 | |
---|
596 | elength = rtems_rfs_dir_entry_length (entry); |
---|
597 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
598 | |
---|
599 | if (elength != RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
600 | { |
---|
601 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
602 | { |
---|
603 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
604 | printf ("rtems-rfs: dir-read: " |
---|
605 | "bad length or ino for ino %" PRIu32 ": %u/%" PRId32 " @ %04" PRIx32 "\n", |
---|
606 | rtems_rfs_inode_ino (dir), elength, eino, map.bpos.boff); |
---|
607 | rc = EIO; |
---|
608 | break; |
---|
609 | } |
---|
610 | |
---|
611 | memset (dirent, 0, sizeof (struct dirent)); |
---|
612 | dirent->d_off = offset; |
---|
613 | dirent->d_reclen = sizeof (struct dirent); |
---|
614 | |
---|
615 | *length += elength; |
---|
616 | |
---|
617 | remaining = rtems_rfs_fs_block_size (fs) - (map.bpos.boff + elength); |
---|
618 | |
---|
619 | if (remaining <= RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
620 | *length += remaining; |
---|
621 | |
---|
622 | elength -= RTEMS_RFS_DIR_ENTRY_SIZE; |
---|
623 | if (elength > NAME_MAX) |
---|
624 | elength = NAME_MAX; |
---|
625 | |
---|
626 | memcpy (dirent->d_name, entry + RTEMS_RFS_DIR_ENTRY_SIZE, elength); |
---|
627 | |
---|
628 | dirent->d_ino = rtems_rfs_dir_entry_ino (entry); |
---|
629 | dirent->d_namlen = elength; |
---|
630 | |
---|
631 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
632 | printf ("rtems-rfs: dir-read: found off:%" PRIooff_t " ino:%ld name=%s\n", |
---|
633 | dirent->d_off, dirent->d_ino, dirent->d_name); |
---|
634 | break; |
---|
635 | } |
---|
636 | |
---|
637 | *length += rtems_rfs_fs_block_size (fs) - map.bpos.boff; |
---|
638 | |
---|
639 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
640 | printf ("rtems-rfs: dir-read: next block: off:%" PRId64 " length:%zd\n", |
---|
641 | offset, *length); |
---|
642 | |
---|
643 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
644 | if (rc == ENXIO) |
---|
645 | rc = ENOENT; |
---|
646 | } |
---|
647 | |
---|
648 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
649 | rtems_rfs_block_map_close (fs, &map); |
---|
650 | return rc; |
---|
651 | } |
---|
652 | |
---|
653 | int |
---|
654 | rtems_rfs_dir_empty (rtems_rfs_file_system* fs, |
---|
655 | rtems_rfs_inode_handle* dir) |
---|
656 | { |
---|
657 | rtems_rfs_block_map map; |
---|
658 | rtems_rfs_buffer_handle buffer; |
---|
659 | rtems_rfs_block_no block; |
---|
660 | bool empty; |
---|
661 | int rc; |
---|
662 | |
---|
663 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
664 | printf ("rtems-rfs: dir-empty: dir=%" PRId32 "\n", rtems_rfs_inode_ino (dir)); |
---|
665 | |
---|
666 | empty = true; |
---|
667 | |
---|
668 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
669 | if (rc > 0) |
---|
670 | return rc; |
---|
671 | |
---|
672 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
673 | if (rc > 0) |
---|
674 | { |
---|
675 | rtems_rfs_block_map_close (fs, &map); |
---|
676 | return rc; |
---|
677 | } |
---|
678 | |
---|
679 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
680 | if (rc > 0) |
---|
681 | { |
---|
682 | rtems_rfs_block_map_close (fs, &map); |
---|
683 | return rc; |
---|
684 | } |
---|
685 | |
---|
686 | /* |
---|
687 | * Look for an empty entry and if this is the last block that is the end of |
---|
688 | * the directory. |
---|
689 | */ |
---|
690 | while (empty) |
---|
691 | { |
---|
692 | uint8_t* entry; |
---|
693 | int offset; |
---|
694 | |
---|
695 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
696 | if (rc > 0) |
---|
697 | break; |
---|
698 | |
---|
699 | entry = rtems_rfs_buffer_data (&buffer); |
---|
700 | offset = 0; |
---|
701 | |
---|
702 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
703 | { |
---|
704 | rtems_rfs_ino eino; |
---|
705 | int elength; |
---|
706 | |
---|
707 | elength = rtems_rfs_dir_entry_length (entry); |
---|
708 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
709 | |
---|
710 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
711 | break; |
---|
712 | |
---|
713 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
714 | { |
---|
715 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_EMPTY)) |
---|
716 | printf ("rtems-rfs: dir-empty: " |
---|
717 | "bad length or ino for ino %" PRIu32 ": %u/%" PRIu32 " @ %04x\n", |
---|
718 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
719 | rc = EIO; |
---|
720 | break; |
---|
721 | } |
---|
722 | |
---|
723 | /* |
---|
724 | * Ignore the current (.) and parent (..) entries. Anything else means |
---|
725 | * the directory is not empty. |
---|
726 | */ |
---|
727 | if (((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 1)) || |
---|
728 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.')) && |
---|
729 | ((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 2)) || |
---|
730 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.') || |
---|
731 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE + 1] != '.'))) |
---|
732 | { |
---|
733 | empty = false; |
---|
734 | break; |
---|
735 | } |
---|
736 | |
---|
737 | entry += elength; |
---|
738 | offset += elength; |
---|
739 | } |
---|
740 | |
---|
741 | if (empty) |
---|
742 | { |
---|
743 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
744 | if (rc > 0) |
---|
745 | { |
---|
746 | if (rc == ENXIO) |
---|
747 | rc = 0; |
---|
748 | break; |
---|
749 | } |
---|
750 | } |
---|
751 | } |
---|
752 | |
---|
753 | if ((rc == 0) && !empty) |
---|
754 | rc = ENOTEMPTY; |
---|
755 | |
---|
756 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
757 | rtems_rfs_block_map_close (fs, &map); |
---|
758 | return rc; |
---|
759 | } |
---|