[a9fa9b7] | 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 | #include <rtems/rfs/rtems-rfs-block.h> |
---|
| 29 | #include <rtems/rfs/rtems-rfs-buffer.h> |
---|
| 30 | #include <rtems/rfs/rtems-rfs-file-system.h> |
---|
| 31 | #include <rtems/rfs/rtems-rfs-trace.h> |
---|
| 32 | #include <rtems/rfs/rtems-rfs-dir.h> |
---|
| 33 | #include <rtems/rfs/rtems-rfs-dir-hash.h> |
---|
| 34 | |
---|
[3cfa636] | 35 | /** |
---|
| 36 | * Validate the directory entry data. |
---|
| 37 | */ |
---|
| 38 | #define rtems_rfs_dir_entry_valid(_f, _l, _i) \ |
---|
| 39 | (((_l) <= RTEMS_RFS_DIR_ENTRY_SIZE) || ((_l) >= rtems_rfs_fs_max_name (_f)) \ |
---|
| 40 | || (_i < RTEMS_RFS_ROOT_INO) || (_i > rtems_rfs_fs_inodes (_f))) |
---|
| 41 | |
---|
[a9fa9b7] | 42 | int |
---|
| 43 | rtems_rfs_dir_lookup_ino (rtems_rfs_file_system* fs, |
---|
| 44 | rtems_rfs_inode_handle* inode, |
---|
| 45 | const char* name, |
---|
| 46 | int length, |
---|
| 47 | rtems_rfs_ino* ino, |
---|
| 48 | uint32_t* offset) |
---|
| 49 | { |
---|
| 50 | rtems_rfs_block_map map; |
---|
| 51 | rtems_rfs_buffer_handle entries; |
---|
| 52 | int rc; |
---|
| 53 | |
---|
| 54 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 55 | { |
---|
| 56 | int c; |
---|
| 57 | printf ("rtems-rfs: dir-lookup-ino: lookup ino: root=%ld, path=", |
---|
| 58 | inode->ino); |
---|
| 59 | for (c = 0; c < length; c++) |
---|
| 60 | printf ("%c", name[c]); |
---|
| 61 | printf (", len=%d\n", length); |
---|
| 62 | } |
---|
| 63 | |
---|
| 64 | *ino = RTEMS_RFS_EMPTY_INO; |
---|
| 65 | *offset = 0; |
---|
| 66 | |
---|
| 67 | rc = rtems_rfs_block_map_open (fs, inode, &map); |
---|
| 68 | if (rc > 0) |
---|
| 69 | { |
---|
| 70 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 71 | printf ("rtems-rfs: dir-lookup-ino: map open failed for ino %lu: %d: %s", |
---|
| 72 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
| 73 | return rc; |
---|
| 74 | } |
---|
| 75 | |
---|
| 76 | rc = rtems_rfs_buffer_handle_open (fs, &entries); |
---|
| 77 | if (rc > 0) |
---|
| 78 | { |
---|
| 79 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 80 | printf ("rtems-rfs: dir-lookup-ino: handle open failed for ino %lu: %d: %s", |
---|
| 81 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
| 82 | rtems_rfs_block_map_close (fs, &map); |
---|
| 83 | return rc; |
---|
| 84 | } |
---|
| 85 | else |
---|
| 86 | { |
---|
| 87 | rtems_rfs_block_no block; |
---|
| 88 | uint32_t hash; |
---|
| 89 | |
---|
| 90 | /* |
---|
| 91 | * Calculate the hash of the look up string. |
---|
| 92 | */ |
---|
| 93 | hash = rtems_rfs_dir_hash (name, length); |
---|
| 94 | |
---|
| 95 | /* |
---|
| 96 | * Locate the first block. The map points to the start after open so just |
---|
| 97 | * seek 0. If an error the block will be 0. |
---|
| 98 | */ |
---|
| 99 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
| 100 | if (rc > 0) |
---|
| 101 | { |
---|
| 102 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 103 | printf ("rtems-rfs: dir-lookup-ino: block map find failed: %d: %s\n", |
---|
| 104 | rc, strerror (rc)); |
---|
| 105 | if (rc == ENXIO) |
---|
| 106 | rc = ENOENT; |
---|
| 107 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
| 108 | rtems_rfs_block_map_close (fs, &map); |
---|
| 109 | return rc; |
---|
| 110 | } |
---|
| 111 | |
---|
| 112 | while ((rc == 0) && block) |
---|
| 113 | { |
---|
| 114 | uint8_t* entry; |
---|
| 115 | |
---|
| 116 | rc = rtems_rfs_buffer_handle_request (fs, &entries, block, true); |
---|
| 117 | if (rc > 0) |
---|
| 118 | { |
---|
| 119 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 120 | printf ("rtems-rfs: dir-lookup-ino: block read, ino=%lu block=%ld: %d: %s\n", |
---|
| 121 | rtems_rfs_inode_ino (inode), block, rc, strerror (rc)); |
---|
| 122 | break; |
---|
| 123 | } |
---|
| 124 | |
---|
| 125 | /* |
---|
| 126 | * Search the block to see if the name matches. A hash of 0xffff or 0x0 |
---|
| 127 | * means the entry is empty. |
---|
| 128 | */ |
---|
| 129 | |
---|
| 130 | entry = rtems_rfs_buffer_data (&entries); |
---|
| 131 | |
---|
| 132 | map.bpos.boff = 0; |
---|
| 133 | |
---|
| 134 | while (map.bpos.boff < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
| 135 | { |
---|
| 136 | uint32_t ehash; |
---|
| 137 | int elength; |
---|
| 138 | |
---|
| 139 | ehash = rtems_rfs_dir_entry_hash (entry); |
---|
| 140 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 141 | *ino = rtems_rfs_dir_entry_ino (entry); |
---|
| 142 | |
---|
| 143 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
| 144 | break; |
---|
| 145 | |
---|
[3cfa636] | 146 | if (rtems_rfs_dir_entry_valid (fs, elength, *ino)) |
---|
[a9fa9b7] | 147 | { |
---|
| 148 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 149 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
| 150 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
---|
| 151 | rtems_rfs_inode_ino (inode), elength, *ino, map.bpos.boff); |
---|
| 152 | rc = EIO; |
---|
| 153 | break; |
---|
| 154 | } |
---|
| 155 | |
---|
| 156 | if (ehash == hash) |
---|
| 157 | { |
---|
| 158 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_CHECK)) |
---|
| 159 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
| 160 | "checking entry for ino %ld: off=%04lx length:%d ino:%d\n", |
---|
| 161 | rtems_rfs_inode_ino (inode), map.bpos.boff, |
---|
| 162 | elength, rtems_rfs_dir_entry_ino (entry)); |
---|
| 163 | |
---|
| 164 | if (memcmp (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length) == 0) |
---|
| 165 | { |
---|
| 166 | *offset = rtems_rfs_block_map_pos (fs, &map); |
---|
| 167 | |
---|
| 168 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO_FOUND)) |
---|
| 169 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
| 170 | "entry found in ino %lu, ino=%lu offset=%lu\n", |
---|
| 171 | rtems_rfs_inode_ino (inode), *ino, *offset); |
---|
| 172 | |
---|
| 173 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
| 174 | rtems_rfs_block_map_close (fs, &map); |
---|
| 175 | return 0; |
---|
| 176 | } |
---|
| 177 | } |
---|
| 178 | |
---|
| 179 | map.bpos.boff += elength; |
---|
| 180 | entry += elength; |
---|
| 181 | } |
---|
| 182 | |
---|
| 183 | if (rc == 0) |
---|
| 184 | { |
---|
| 185 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
| 186 | if ((rc > 0) && (rc != ENXIO)) |
---|
| 187 | { |
---|
| 188 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 189 | printf ("rtems-rfs: dir-lookup-ino: " \ |
---|
| 190 | "block map next block failed in ino %lu: %d: %s\n", |
---|
| 191 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
| 192 | } |
---|
| 193 | if (rc == ENXIO) |
---|
| 194 | rc = ENOENT; |
---|
| 195 | } |
---|
| 196 | } |
---|
| 197 | |
---|
| 198 | if ((rc == 0) && (block == 0)) |
---|
| 199 | { |
---|
| 200 | rc = EIO; |
---|
| 201 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_LOOKUP_INO)) |
---|
| 202 | printf ("rtems-rfs: dir-lookup-ino: block is 0 in ino %lu: %d: %s\n", |
---|
| 203 | rtems_rfs_inode_ino (inode), rc, strerror (rc)); |
---|
| 204 | } |
---|
| 205 | } |
---|
| 206 | |
---|
| 207 | rtems_rfs_buffer_handle_close (fs, &entries); |
---|
| 208 | rtems_rfs_block_map_close (fs, &map); |
---|
| 209 | return rc; |
---|
| 210 | } |
---|
| 211 | |
---|
| 212 | int |
---|
| 213 | rtems_rfs_dir_add_entry (rtems_rfs_file_system* fs, |
---|
| 214 | rtems_rfs_inode_handle* dir, |
---|
| 215 | const char* name, |
---|
| 216 | size_t length, |
---|
| 217 | rtems_rfs_ino ino) |
---|
| 218 | { |
---|
| 219 | rtems_rfs_block_map map; |
---|
| 220 | rtems_rfs_block_pos bpos; |
---|
| 221 | rtems_rfs_buffer_handle buffer; |
---|
| 222 | int rc; |
---|
| 223 | |
---|
| 224 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
| 225 | { |
---|
| 226 | int c; |
---|
| 227 | printf ("rtems-rfs: dir-add-entry: dir=%ld, name=", |
---|
| 228 | rtems_rfs_inode_ino (dir)); |
---|
| 229 | for (c = 0; c < length; c++) |
---|
| 230 | printf ("%c", name[c]); |
---|
| 231 | printf (", len=%ld\n", length); |
---|
| 232 | } |
---|
| 233 | |
---|
| 234 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
| 235 | if (rc > 0) |
---|
| 236 | return rc; |
---|
| 237 | |
---|
| 238 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
| 239 | if (rc > 0) |
---|
| 240 | { |
---|
| 241 | rtems_rfs_block_map_close (fs, &map); |
---|
| 242 | return rc; |
---|
| 243 | } |
---|
| 244 | |
---|
| 245 | /* |
---|
| 246 | * Search the map from the beginning to find any empty space. |
---|
| 247 | */ |
---|
| 248 | rtems_rfs_block_set_bpos_zero (&bpos); |
---|
| 249 | |
---|
| 250 | while (true) |
---|
| 251 | { |
---|
| 252 | rtems_rfs_block_no block; |
---|
| 253 | uint8_t* entry; |
---|
| 254 | int offset; |
---|
| 255 | bool read = true; |
---|
| 256 | |
---|
| 257 | /* |
---|
| 258 | * Locate the first block. If an error the block will be 0. If the map is |
---|
| 259 | * empty which happens when creating a directory and adding the first entry |
---|
| 260 | * the seek will return ENXIO. In this case we need to grow the directory. |
---|
| 261 | */ |
---|
| 262 | rc = rtems_rfs_block_map_find (fs, &map, &bpos, &block); |
---|
| 263 | if (rc > 0) |
---|
| 264 | { |
---|
| 265 | if (rc != ENXIO) |
---|
| 266 | { |
---|
| 267 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
| 268 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
| 269 | "block map find failed for ino %lu: %d: %s\n", |
---|
| 270 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
| 271 | break; |
---|
| 272 | } |
---|
| 273 | |
---|
| 274 | /* |
---|
| 275 | * We have reached the end of the directory so add a block. |
---|
| 276 | */ |
---|
| 277 | rc = rtems_rfs_block_map_grow (fs, &map, 1, &block); |
---|
| 278 | if (rc > 0) |
---|
| 279 | { |
---|
| 280 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
| 281 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
| 282 | "block map grow failed for ino %lu: %d: %s\n", |
---|
| 283 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
| 284 | break; |
---|
| 285 | } |
---|
| 286 | |
---|
| 287 | read = false; |
---|
| 288 | } |
---|
| 289 | |
---|
| 290 | bpos.bno++; |
---|
| 291 | |
---|
| 292 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, read); |
---|
| 293 | if (rc > 0) |
---|
| 294 | { |
---|
| 295 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
| 296 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
| 297 | "block buffer req failed for ino %lu: %d: %s\n", |
---|
| 298 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
| 299 | break; |
---|
| 300 | } |
---|
| 301 | |
---|
| 302 | entry = rtems_rfs_buffer_data (&buffer); |
---|
| 303 | |
---|
| 304 | if (!read) |
---|
| 305 | memset (entry, 0xff, rtems_rfs_fs_block_size (fs)); |
---|
| 306 | |
---|
| 307 | offset = 0; |
---|
| 308 | |
---|
| 309 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
| 310 | { |
---|
| 311 | rtems_rfs_ino eino; |
---|
| 312 | int elength; |
---|
| 313 | |
---|
| 314 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 315 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
| 316 | |
---|
| 317 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
| 318 | { |
---|
| 319 | if ((length + RTEMS_RFS_DIR_ENTRY_SIZE) < |
---|
| 320 | (rtems_rfs_fs_block_size (fs) - offset)) |
---|
| 321 | { |
---|
| 322 | uint32_t hash; |
---|
| 323 | hash = rtems_rfs_dir_hash (name, length); |
---|
| 324 | rtems_rfs_dir_set_entry_hash (entry, hash); |
---|
| 325 | rtems_rfs_dir_set_entry_ino (entry, ino); |
---|
| 326 | rtems_rfs_dir_set_entry_length (entry, |
---|
| 327 | RTEMS_RFS_DIR_ENTRY_SIZE + length); |
---|
| 328 | memcpy (entry + RTEMS_RFS_DIR_ENTRY_SIZE, name, length); |
---|
| 329 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
| 330 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 331 | rtems_rfs_block_map_close (fs, &map); |
---|
| 332 | return 0; |
---|
| 333 | } |
---|
| 334 | |
---|
| 335 | break; |
---|
| 336 | } |
---|
| 337 | |
---|
[3cfa636] | 338 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
[a9fa9b7] | 339 | { |
---|
| 340 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_ADD_ENTRY)) |
---|
| 341 | printf ("rtems-rfs: dir-add-entry: " \ |
---|
| 342 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
| 343 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
| 344 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 345 | rtems_rfs_block_map_close (fs, &map); |
---|
| 346 | return EIO; |
---|
| 347 | } |
---|
| 348 | |
---|
| 349 | entry += elength; |
---|
| 350 | offset += elength; |
---|
| 351 | } |
---|
| 352 | } |
---|
| 353 | |
---|
| 354 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 355 | rtems_rfs_block_map_close (fs, &map); |
---|
| 356 | return rc; |
---|
| 357 | } |
---|
| 358 | |
---|
| 359 | int |
---|
| 360 | rtems_rfs_dir_del_entry (rtems_rfs_file_system* fs, |
---|
| 361 | rtems_rfs_inode_handle* dir, |
---|
| 362 | rtems_rfs_ino ino, |
---|
| 363 | uint32_t offset) |
---|
| 364 | { |
---|
| 365 | rtems_rfs_block_map map; |
---|
| 366 | rtems_rfs_block_no block; |
---|
| 367 | rtems_rfs_buffer_handle buffer; |
---|
| 368 | bool search; |
---|
| 369 | int rc; |
---|
| 370 | |
---|
| 371 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
| 372 | printf ("rtems-rfs: dir-del-entry: dir=%ld, entry=%ld offset=%lu\n", |
---|
| 373 | rtems_rfs_inode_ino (dir), ino, offset); |
---|
| 374 | |
---|
| 375 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
| 376 | if (rc > 0) |
---|
| 377 | return rc; |
---|
| 378 | |
---|
| 379 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
| 380 | if (rc > 0) |
---|
| 381 | { |
---|
| 382 | if (rc == ENXIO) |
---|
| 383 | rc = ENOENT; |
---|
| 384 | rtems_rfs_block_map_close (fs, &map); |
---|
| 385 | return rc; |
---|
| 386 | } |
---|
| 387 | |
---|
| 388 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
| 389 | if (rc > 0) |
---|
| 390 | { |
---|
| 391 | rtems_rfs_block_map_close (fs, &map); |
---|
| 392 | return rc; |
---|
| 393 | } |
---|
| 394 | |
---|
| 395 | /* |
---|
| 396 | * Only search if the offset is 0 else we are at that position. |
---|
| 397 | */ |
---|
| 398 | search = offset ? false : true; |
---|
| 399 | |
---|
| 400 | while (rc == 0) |
---|
| 401 | { |
---|
| 402 | uint8_t* entry; |
---|
| 403 | int offset; |
---|
| 404 | |
---|
| 405 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
| 406 | if (rc > 0) |
---|
| 407 | { |
---|
| 408 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
| 409 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
| 410 | "block buffer req failed for ino %lu: %d: %s\n", |
---|
| 411 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
| 412 | break; |
---|
| 413 | } |
---|
| 414 | |
---|
| 415 | entry = rtems_rfs_buffer_data (&buffer); |
---|
| 416 | offset = 0; |
---|
| 417 | |
---|
| 418 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
| 419 | { |
---|
| 420 | rtems_rfs_ino eino; |
---|
| 421 | int elength; |
---|
| 422 | |
---|
| 423 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 424 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
| 425 | |
---|
| 426 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
| 427 | break; |
---|
| 428 | |
---|
[3cfa636] | 429 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
[a9fa9b7] | 430 | { |
---|
| 431 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
| 432 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
| 433 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
| 434 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
| 435 | rc = EIO; |
---|
| 436 | break; |
---|
| 437 | } |
---|
| 438 | |
---|
| 439 | if (ino == rtems_rfs_dir_entry_ino (entry)) |
---|
| 440 | { |
---|
| 441 | uint32_t remaining; |
---|
| 442 | remaining = rtems_rfs_fs_block_size (fs) - (offset + elength); |
---|
| 443 | memmove (entry, entry + elength, remaining); |
---|
| 444 | memset (entry + remaining, 0xff, elength); |
---|
| 445 | |
---|
| 446 | /* |
---|
| 447 | * If the remainder of the block is empty and this is the start of the |
---|
| 448 | * block and it is the last block in the map shrink the map. |
---|
| 449 | * |
---|
| 450 | * @note We could check again to see if the new end block in the map is |
---|
| 451 | * also empty. This way we could clean up an empty directory. |
---|
| 452 | */ |
---|
| 453 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 454 | |
---|
| 455 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
| 456 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
| 457 | "last block free for ino %lu: elength=%i offset=%d last=%s\n", |
---|
| 458 | ino, elength, offset, |
---|
| 459 | rtems_rfs_block_map_last (&map) ? "yes" : "no"); |
---|
| 460 | |
---|
| 461 | if ((elength == RTEMS_RFS_DIR_ENTRY_EMPTY) && |
---|
| 462 | (offset == 0) && rtems_rfs_block_map_last (&map)) |
---|
| 463 | { |
---|
| 464 | rc = rtems_rfs_block_map_shrink (fs, &map, 1); |
---|
| 465 | if (rc > 0) |
---|
| 466 | { |
---|
| 467 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_DEL_ENTRY)) |
---|
| 468 | printf ("rtems-rfs: dir-del-entry: " \ |
---|
| 469 | "block map shrink failed for ino %lu: %d: %s\n", |
---|
| 470 | rtems_rfs_inode_ino (dir), rc, strerror (rc)); |
---|
| 471 | } |
---|
| 472 | } |
---|
| 473 | |
---|
| 474 | rtems_rfs_buffer_mark_dirty (&buffer); |
---|
| 475 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 476 | rtems_rfs_block_map_close (fs, &map); |
---|
| 477 | return 0; |
---|
| 478 | } |
---|
| 479 | |
---|
| 480 | if (!search) |
---|
| 481 | { |
---|
| 482 | rc = EIO; |
---|
| 483 | break; |
---|
| 484 | } |
---|
| 485 | |
---|
| 486 | entry += elength; |
---|
| 487 | offset += elength; |
---|
| 488 | } |
---|
| 489 | |
---|
| 490 | if (rc == 0) |
---|
| 491 | { |
---|
| 492 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
| 493 | if (rc == ENXIO) |
---|
| 494 | rc = ENOENT; |
---|
| 495 | } |
---|
| 496 | } |
---|
| 497 | |
---|
| 498 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 499 | rtems_rfs_block_map_close (fs, &map); |
---|
| 500 | return rc; |
---|
| 501 | } |
---|
| 502 | |
---|
| 503 | int |
---|
| 504 | rtems_rfs_dir_read (rtems_rfs_file_system* fs, |
---|
| 505 | rtems_rfs_inode_handle* dir, |
---|
| 506 | rtems_rfs_pos_rel offset, |
---|
| 507 | struct dirent* dirent, |
---|
| 508 | size_t* length) |
---|
| 509 | { |
---|
| 510 | rtems_rfs_block_map map; |
---|
| 511 | rtems_rfs_buffer_handle buffer; |
---|
| 512 | rtems_rfs_block_no block; |
---|
| 513 | int rc; |
---|
| 514 | |
---|
| 515 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
| 516 | printf ("rtems-rfs: dir-read: dir=%ld offset=%Ld\n", |
---|
| 517 | rtems_rfs_inode_ino (dir), offset); |
---|
| 518 | |
---|
| 519 | *length = 0; |
---|
| 520 | |
---|
| 521 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
| 522 | if (rc > 0) |
---|
| 523 | return rc; |
---|
| 524 | |
---|
| 525 | if (((rtems_rfs_fs_block_size (fs) - |
---|
| 526 | (offset % rtems_rfs_fs_block_size (fs))) <= RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
| 527 | offset = (((offset / rtems_rfs_fs_block_size (fs)) + 1) * |
---|
| 528 | rtems_rfs_fs_block_size (fs)); |
---|
| 529 | |
---|
| 530 | rc = rtems_rfs_block_map_seek (fs, &map, offset, &block); |
---|
| 531 | if (rc > 0) |
---|
| 532 | { |
---|
| 533 | if (rc == ENXIO) |
---|
| 534 | rc = ENOENT; |
---|
| 535 | rtems_rfs_block_map_close (fs, &map); |
---|
| 536 | return rc; |
---|
| 537 | } |
---|
| 538 | |
---|
| 539 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
| 540 | if (rc > 0) |
---|
| 541 | { |
---|
| 542 | rtems_rfs_block_map_close (fs, &map); |
---|
| 543 | return rc; |
---|
| 544 | } |
---|
| 545 | |
---|
| 546 | /* |
---|
| 547 | * Look for an empty entry and if this is the last block that is the end of |
---|
| 548 | * the directory. |
---|
| 549 | */ |
---|
| 550 | while (rc == 0) |
---|
| 551 | { |
---|
| 552 | uint8_t* entry; |
---|
| 553 | rtems_rfs_ino eino; |
---|
| 554 | int elength; |
---|
| 555 | int remaining; |
---|
| 556 | |
---|
| 557 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
| 558 | if (rc > 0) |
---|
| 559 | { |
---|
| 560 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 561 | rtems_rfs_block_map_close (fs, &map); |
---|
| 562 | return rc; |
---|
| 563 | } |
---|
| 564 | |
---|
| 565 | entry = rtems_rfs_buffer_data (&buffer); |
---|
| 566 | entry += map.bpos.boff; |
---|
| 567 | |
---|
| 568 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 569 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
| 570 | |
---|
| 571 | if (elength != RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
| 572 | { |
---|
[3cfa636] | 573 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
[a9fa9b7] | 574 | { |
---|
| 575 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
| 576 | printf ("rtems-rfs: dir-read: " \ |
---|
| 577 | "bad length or ino for ino %lu: %u/%ld @ %04lx\n", |
---|
| 578 | rtems_rfs_inode_ino (dir), elength, eino, map.bpos.boff); |
---|
| 579 | rc = EIO; |
---|
| 580 | break; |
---|
| 581 | } |
---|
| 582 | |
---|
| 583 | memset (dirent, 0, sizeof (struct dirent)); |
---|
| 584 | dirent->d_off = offset; |
---|
| 585 | dirent->d_reclen = sizeof (struct dirent); |
---|
| 586 | |
---|
| 587 | *length += elength; |
---|
| 588 | |
---|
| 589 | remaining = rtems_rfs_fs_block_size (fs) - (map.bpos.boff + elength); |
---|
| 590 | |
---|
| 591 | if (remaining <= RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
| 592 | *length += remaining; |
---|
| 593 | |
---|
| 594 | if (elength < RTEMS_RFS_DIR_ENTRY_SIZE) |
---|
| 595 | elength = 0; |
---|
| 596 | else |
---|
| 597 | elength -= RTEMS_RFS_DIR_ENTRY_SIZE; |
---|
| 598 | if (elength > NAME_MAX) |
---|
| 599 | elength = NAME_MAX; |
---|
| 600 | |
---|
| 601 | memcpy (dirent->d_name, entry + RTEMS_RFS_DIR_ENTRY_SIZE, elength); |
---|
| 602 | |
---|
| 603 | dirent->d_ino = rtems_rfs_dir_entry_ino (entry); |
---|
| 604 | dirent->d_namlen = elength; |
---|
| 605 | |
---|
| 606 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
[59762963] | 607 | printf ("rtems-rfs: dir-read: found off:%Ld ino:%ld name=%s\n", |
---|
[a9fa9b7] | 608 | dirent->d_off, dirent->d_ino, dirent->d_name); |
---|
| 609 | break; |
---|
| 610 | } |
---|
| 611 | |
---|
| 612 | *length += rtems_rfs_fs_block_size (fs) - map.bpos.boff; |
---|
| 613 | |
---|
| 614 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
| 615 | printf ("rtems-rfs: dir-read: next block: off:%ld length:%ld\n", |
---|
| 616 | (uint32_t) offset, *length); |
---|
| 617 | |
---|
| 618 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
| 619 | if (rc == ENXIO) |
---|
| 620 | rc = ENOENT; |
---|
| 621 | } |
---|
| 622 | |
---|
| 623 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 624 | rtems_rfs_block_map_close (fs, &map); |
---|
| 625 | return rc; |
---|
| 626 | } |
---|
| 627 | |
---|
| 628 | int |
---|
| 629 | rtems_rfs_dir_empty (rtems_rfs_file_system* fs, |
---|
| 630 | rtems_rfs_inode_handle* dir) |
---|
| 631 | { |
---|
| 632 | rtems_rfs_block_map map; |
---|
| 633 | rtems_rfs_buffer_handle buffer; |
---|
| 634 | rtems_rfs_block_no block; |
---|
| 635 | bool empty; |
---|
| 636 | int rc; |
---|
| 637 | |
---|
| 638 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_READ)) |
---|
| 639 | printf ("rtems-rfs: dir-empty: dir=%ld\n", rtems_rfs_inode_ino (dir)); |
---|
| 640 | |
---|
| 641 | empty = true; |
---|
| 642 | |
---|
| 643 | rc = rtems_rfs_block_map_open (fs, dir, &map); |
---|
| 644 | if (rc > 0) |
---|
| 645 | return rc; |
---|
| 646 | |
---|
| 647 | rc = rtems_rfs_block_map_seek (fs, &map, 0, &block); |
---|
| 648 | if (rc > 0) |
---|
| 649 | { |
---|
| 650 | rtems_rfs_block_map_close (fs, &map); |
---|
| 651 | return rc; |
---|
| 652 | } |
---|
| 653 | |
---|
| 654 | rc = rtems_rfs_buffer_handle_open (fs, &buffer); |
---|
| 655 | if (rc > 0) |
---|
| 656 | { |
---|
| 657 | rtems_rfs_block_map_close (fs, &map); |
---|
| 658 | return rc; |
---|
| 659 | } |
---|
| 660 | |
---|
| 661 | /* |
---|
| 662 | * Look for an empty entry and if this is the last block that is the end of |
---|
| 663 | * the directory. |
---|
| 664 | */ |
---|
| 665 | while (empty) |
---|
| 666 | { |
---|
| 667 | uint8_t* entry; |
---|
| 668 | int offset; |
---|
| 669 | |
---|
| 670 | rc = rtems_rfs_buffer_handle_request (fs, &buffer, block, true); |
---|
| 671 | if (rc > 0) |
---|
| 672 | break; |
---|
| 673 | |
---|
| 674 | entry = rtems_rfs_buffer_data (&buffer); |
---|
| 675 | offset = 0; |
---|
| 676 | |
---|
| 677 | while (offset < (rtems_rfs_fs_block_size (fs) - RTEMS_RFS_DIR_ENTRY_SIZE)) |
---|
| 678 | { |
---|
| 679 | rtems_rfs_ino eino; |
---|
| 680 | int elength; |
---|
| 681 | |
---|
| 682 | elength = rtems_rfs_dir_entry_length (entry); |
---|
| 683 | eino = rtems_rfs_dir_entry_ino (entry); |
---|
| 684 | |
---|
| 685 | if (elength == RTEMS_RFS_DIR_ENTRY_EMPTY) |
---|
| 686 | break; |
---|
| 687 | |
---|
[3cfa636] | 688 | if (rtems_rfs_dir_entry_valid (fs, elength, eino)) |
---|
[a9fa9b7] | 689 | { |
---|
| 690 | if (rtems_rfs_trace (RTEMS_RFS_TRACE_DIR_EMPTY)) |
---|
| 691 | printf ("rtems-rfs: dir-empty: " \ |
---|
| 692 | "bad length or ino for ino %lu: %u/%ld @ %04x\n", |
---|
| 693 | rtems_rfs_inode_ino (dir), elength, eino, offset); |
---|
| 694 | rc = EIO; |
---|
| 695 | break; |
---|
| 696 | } |
---|
| 697 | |
---|
| 698 | /* |
---|
| 699 | * Ignore the current (.) and parent (..) entries. Anything else means |
---|
| 700 | * the directory is not empty. |
---|
| 701 | */ |
---|
| 702 | if (((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 1)) || |
---|
| 703 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.')) && |
---|
| 704 | ((elength != (RTEMS_RFS_DIR_ENTRY_SIZE + 2)) || |
---|
| 705 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE] != '.') || |
---|
| 706 | (entry[RTEMS_RFS_DIR_ENTRY_SIZE + 1] != '.'))) |
---|
| 707 | { |
---|
| 708 | empty = false; |
---|
| 709 | break; |
---|
| 710 | } |
---|
| 711 | |
---|
| 712 | entry += elength; |
---|
| 713 | offset += elength; |
---|
| 714 | } |
---|
| 715 | |
---|
| 716 | if (empty) |
---|
| 717 | { |
---|
| 718 | rc = rtems_rfs_block_map_next_block (fs, &map, &block); |
---|
| 719 | if (rc > 0) |
---|
| 720 | { |
---|
| 721 | if (rc == ENXIO) |
---|
| 722 | rc = 0; |
---|
| 723 | break; |
---|
| 724 | } |
---|
| 725 | } |
---|
| 726 | } |
---|
| 727 | |
---|
| 728 | if ((rc == 0) && !empty) |
---|
| 729 | rc = ENOTEMPTY; |
---|
| 730 | |
---|
| 731 | rtems_rfs_buffer_handle_close (fs, &buffer); |
---|
| 732 | rtems_rfs_block_map_close (fs, &map); |
---|
| 733 | return rc; |
---|
| 734 | } |
---|