Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ufs/dir.c
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1 /* 2 * linux/fs/ufs/ufs_dir.c 3 * 4 * Copyright (C) 1996 5 * Adrian Rodriguez (adrian@franklins-tower.rutgers.edu) 6 * Laboratory for Computer Science Research Computing Facility 7 * Rutgers, The State University of New Jersey 8 * 9 * swab support by Francois-Rene Rideau <fare@tunes.org> 19970406 10 * 11 * 4.4BSD (FreeBSD) support added on February 1st 1998 by 12 * Niels Kristian Bech Jensen <nkbj@image.dk> partially based 13 * on code by Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>. 14 */ 15 16 #include <linux/sched.h> 17 #include <linux/locks.h> 18 #include <linux/fs.h> 19 #include <linux/ufs_fs.h> 20 21 #include "swab.h" 22 #include "util.h" 23 24 #undef UFS_DIR_DEBUG 25 26 #ifdef UFS_DIR_DEBUG 27 #define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x; 28 #else 29 #define UFSD(x) 30 #endif 31 32 33 34 /* 35 * NOTE! unlike strncmp, ufs_match returns 1 for success, 0 for failure. 36 * 37 * len <= UFS_MAXNAMLEN and de != NULL are guaranteed by caller. 38 */ 39 static inline int ufs_match(struct super_block *sb, int len, 40 const char * const name, struct ufs_dir_entry * de) 41 { 42 if (len != ufs_get_de_namlen(sb, de)) 43 return 0; 44 if (!de->d_ino) 45 return 0; 46 return !memcmp(name, de->d_name, len); 47 } 48 49 /* 50 * This is blatantly stolen from ext2fs 51 */ 52 static int 53 ufs_readdir (struct file * filp, void * dirent, filldir_t filldir) 54 { 55 struct inode *inode = filp->f_dentry->d_inode; 56 int error = 0; 57 unsigned long offset, lblk, blk; 58 int i, stored; 59 struct buffer_head * bh; 60 struct ufs_dir_entry * de; 61 struct super_block * sb; 62 int de_reclen; 63 unsigned flags; 64 65 sb = inode->i_sb; 66 flags = sb->u.ufs_sb.s_flags; 67 68 UFSD(("ENTER, ino %lu f_pos %lu\n", inode->i_ino, (unsigned long) filp->f_pos)) 69 70 stored = 0; 71 bh = NULL; 72 offset = filp->f_pos & (sb->s_blocksize - 1); 73 74 while (!error && !stored && filp->f_pos < inode->i_size) { 75 lblk = (filp->f_pos) >> sb->s_blocksize_bits; 76 blk = ufs_frag_map(inode, lblk); 77 if (!blk || !(bh = sb_bread(sb, blk))) { 78 /* XXX - error - skip to the next block */ 79 printk("ufs_readdir: " 80 "dir inode %lu has a hole at offset %lu\n", 81 inode->i_ino, (unsigned long int)filp->f_pos); 82 filp->f_pos += sb->s_blocksize - offset; 83 continue; 84 } 85 86 revalidate: 87 /* If the dir block has changed since the last call to 88 * readdir(2), then we might be pointing to an invalid 89 * dirent right now. Scan from the start of the block 90 * to make sure. */ 91 if (filp->f_version != inode->i_version) { 92 for (i = 0; i < sb->s_blocksize && i < offset; ) { 93 de = (struct ufs_dir_entry *)(bh->b_data + i); 94 /* It's too expensive to do a full 95 * dirent test each time round this 96 * loop, but we do have to test at 97 * least that it is non-zero. A 98 * failure will be detected in the 99 * dirent test below. */ 100 de_reclen = fs16_to_cpu(sb, de->d_reclen); 101 if (de_reclen < 1) 102 break; 103 i += de_reclen; 104 } 105 offset = i; 106 filp->f_pos = (filp->f_pos & ~(sb->s_blocksize - 1)) 107 | offset; 108 filp->f_version = inode->i_version; 109 } 110 111 while (!error && filp->f_pos < inode->i_size 112 && offset < sb->s_blocksize) { 113 de = (struct ufs_dir_entry *) (bh->b_data + offset); 114 /* XXX - put in a real ufs_check_dir_entry() */ 115 if ((de->d_reclen == 0) || (ufs_get_de_namlen(sb, de) == 0)) { 116 filp->f_pos = (filp->f_pos & 117 (sb->s_blocksize - 1)) + 118 sb->s_blocksize; 119 brelse(bh); 120 return stored; 121 } 122 if (!ufs_check_dir_entry ("ufs_readdir", inode, de, 123 bh, offset)) { 124 /* On error, skip the f_pos to the 125 next block. */ 126 filp->f_pos = (filp->f_pos | 127 (sb->s_blocksize - 1)) + 128 1; 129 brelse (bh); 130 return stored; 131 } 132 offset += fs16_to_cpu(sb, de->d_reclen); 133 if (de->d_ino) { 134 /* We might block in the next section 135 * if the data destination is 136 * currently swapped out. So, use a 137 * version stamp to detect whether or 138 * not the directory has been modified 139 * during the copy operation. */ 140 unsigned long version = filp->f_version; 141 unsigned char d_type = DT_UNKNOWN; 142 143 UFSD(("filldir(%s,%u)\n", de->d_name, 144 fs32_to_cpu(sb, de->d_ino))) 145 UFSD(("namlen %u\n", ufs_get_de_namlen(sb, de))) 146 147 if ((flags & UFS_DE_MASK) == UFS_DE_44BSD) 148 d_type = de->d_u.d_44.d_type; 149 error = filldir(dirent, de->d_name, 150 ufs_get_de_namlen(sb, de), filp->f_pos, 151 fs32_to_cpu(sb, de->d_ino), d_type); 152 if (error) 153 break; 154 if (version != filp->f_version) 155 goto revalidate; 156 stored ++; 157 } 158 filp->f_pos += fs16_to_cpu(sb, de->d_reclen); 159 } 160 offset = 0; 161 brelse (bh); 162 } 163 UPDATE_ATIME(inode); 164 return 0; 165 } 166 167 /* 168 * define how far ahead to read directories while searching them. 169 */ 170 #define NAMEI_RA_CHUNKS 2 171 #define NAMEI_RA_BLOCKS 4 172 #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS) 173 #define NAMEI_RA_INDEX(c,b) (((c) * NAMEI_RA_BLOCKS) + (b)) 174 175 /* 176 * ufs_find_entry() 177 * 178 * finds an entry in the specified directory with the wanted name. It 179 * returns the cache buffer in which the entry was found, and the entry 180 * itself (as a parameter - res_bh). It does NOT read the inode of the 181 * entry - you'll have to do that yourself if you want to. 182 */ 183 struct ufs_dir_entry * ufs_find_entry (struct dentry *dentry, 184 struct buffer_head ** res_bh) 185 { 186 struct super_block * sb; 187 struct buffer_head * bh_use[NAMEI_RA_SIZE]; 188 struct buffer_head * bh_read[NAMEI_RA_SIZE]; 189 unsigned long offset; 190 int block, toread, i, err; 191 struct inode *dir = dentry->d_parent->d_inode; 192 const char *name = dentry->d_name.name; 193 int namelen = dentry->d_name.len; 194 195 UFSD(("ENTER, dir_ino %lu, name %s, namlen %u\n", dir->i_ino, name, namelen)) 196 197 *res_bh = NULL; 198 199 sb = dir->i_sb; 200 201 if (namelen > UFS_MAXNAMLEN) 202 return NULL; 203 204 memset (bh_use, 0, sizeof (bh_use)); 205 toread = 0; 206 for (block = 0; block < NAMEI_RA_SIZE; ++block) { 207 struct buffer_head * bh; 208 209 if ((block << sb->s_blocksize_bits) >= dir->i_size) 210 break; 211 bh = ufs_getfrag (dir, block, 0, &err); 212 bh_use[block] = bh; 213 if (bh && !buffer_uptodate(bh)) 214 bh_read[toread++] = bh; 215 } 216 217 for (block = 0, offset = 0; offset < dir->i_size; block++) { 218 struct buffer_head * bh; 219 struct ufs_dir_entry * de; 220 char * dlimit; 221 222 if ((block % NAMEI_RA_BLOCKS) == 0 && toread) { 223 ll_rw_block (READ, toread, bh_read); 224 toread = 0; 225 } 226 bh = bh_use[block % NAMEI_RA_SIZE]; 227 if (!bh) { 228 ufs_error (sb, "ufs_find_entry", 229 "directory #%lu contains a hole at offset %lu", 230 dir->i_ino, offset); 231 offset += sb->s_blocksize; 232 continue; 233 } 234 wait_on_buffer (bh); 235 if (!buffer_uptodate(bh)) { 236 /* 237 * read error: all bets are off 238 */ 239 break; 240 } 241 242 de = (struct ufs_dir_entry *) bh->b_data; 243 dlimit = bh->b_data + sb->s_blocksize; 244 while ((char *) de < dlimit && offset < dir->i_size) { 245 /* this code is executed quadratically often */ 246 /* do minimal checking by hand */ 247 int de_len; 248 249 if ((char *) de + namelen <= dlimit && 250 ufs_match(sb, namelen, name, de)) { 251 /* found a match - 252 just to be sure, do a full check */ 253 if (!ufs_check_dir_entry("ufs_find_entry", 254 dir, de, bh, offset)) 255 goto failed; 256 for (i = 0; i < NAMEI_RA_SIZE; ++i) { 257 if (bh_use[i] != bh) 258 brelse (bh_use[i]); 259 } 260 *res_bh = bh; 261 return de; 262 } 263 /* prevent looping on a bad block */ 264 de_len = fs16_to_cpu(sb, de->d_reclen); 265 if (de_len <= 0) 266 goto failed; 267 offset += de_len; 268 de = (struct ufs_dir_entry *) ((char *) de + de_len); 269 } 270 271 brelse (bh); 272 if (((block + NAMEI_RA_SIZE) << sb->s_blocksize_bits ) >= 273 dir->i_size) 274 bh = NULL; 275 else 276 bh = ufs_getfrag (dir, block + NAMEI_RA_SIZE, 0, &err); 277 bh_use[block % NAMEI_RA_SIZE] = bh; 278 if (bh && !buffer_uptodate(bh)) 279 bh_read[toread++] = bh; 280 } 281 282 failed: 283 for (i = 0; i < NAMEI_RA_SIZE; ++i) brelse (bh_use[i]); 284 UFSD(("EXIT\n")) 285 return NULL; 286 } 287 288 int ufs_check_dir_entry (const char * function, struct inode * dir, 289 struct ufs_dir_entry * de, struct buffer_head * bh, 290 unsigned long offset) 291 { 292 struct super_block *sb = dir->i_sb; 293 const char *error_msg = NULL; 294 int rlen = fs16_to_cpu(sb, de->d_reclen); 295 296 if (rlen < UFS_DIR_REC_LEN(1)) 297 error_msg = "reclen is smaller than minimal"; 298 else if (rlen % 4 != 0) 299 error_msg = "reclen % 4 != 0"; 300 else if (rlen < UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de))) 301 error_msg = "reclen is too small for namlen"; 302 else if (((char *) de - bh->b_data) + rlen > dir->i_sb->s_blocksize) 303 error_msg = "directory entry across blocks"; 304 else if (fs32_to_cpu(sb, de->d_ino) > (sb->u.ufs_sb.s_uspi->s_ipg * 305 sb->u.ufs_sb.s_uspi->s_ncg)) 306 error_msg = "inode out of bounds"; 307 308 if (error_msg != NULL) 309 ufs_error (sb, function, "bad entry in directory #%lu, size %Lu: %s - " 310 "offset=%lu, inode=%lu, reclen=%d, namlen=%d", 311 dir->i_ino, dir->i_size, error_msg, offset, 312 (unsigned long)fs32_to_cpu(sb, de->d_ino), 313 rlen, ufs_get_de_namlen(sb, de)); 314 315 return (error_msg == NULL ? 1 : 0); 316 } 317 318 struct ufs_dir_entry *ufs_dotdot(struct inode *dir, struct buffer_head **p) 319 { 320 int err; 321 struct buffer_head *bh = ufs_bread (dir, 0, 0, &err); 322 struct ufs_dir_entry *res = NULL; 323 324 if (bh) { 325 res = (struct ufs_dir_entry *) bh->b_data; 326 res = (struct ufs_dir_entry *)((char *)res + 327 fs16_to_cpu(dir->i_sb, res->d_reclen)); 328 } 329 *p = bh; 330 return res; 331 } 332 ino_t ufs_inode_by_name(struct inode * dir, struct dentry *dentry) 333 { 334 ino_t res = 0; 335 struct ufs_dir_entry * de; 336 struct buffer_head *bh; 337 338 de = ufs_find_entry (dentry, &bh); 339 if (de) { 340 res = fs32_to_cpu(dir->i_sb, de->d_ino); 341 brelse(bh); 342 } 343 return res; 344 } 345 346 void ufs_set_link(struct inode *dir, struct ufs_dir_entry *de, 347 struct buffer_head *bh, struct inode *inode) 348 { 349 dir->i_version = ++event; 350 de->d_ino = cpu_to_fs32(dir->i_sb, inode->i_ino); 351 mark_buffer_dirty(bh); 352 if (IS_SYNC(dir)) { 353 ll_rw_block (WRITE, 1, &bh); 354 wait_on_buffer(bh); 355 } 356 brelse (bh); 357 } 358 359 /* 360 * ufs_add_entry() 361 * 362 * adds a file entry to the specified directory, using the same 363 * semantics as ufs_find_entry(). It returns NULL if it failed. 364 */ 365 int ufs_add_link(struct dentry *dentry, struct inode *inode) 366 { 367 struct super_block * sb; 368 struct ufs_sb_private_info * uspi; 369 unsigned long offset; 370 unsigned fragoff; 371 unsigned short rec_len; 372 struct buffer_head * bh; 373 struct ufs_dir_entry * de, * de1; 374 struct inode *dir = dentry->d_parent->d_inode; 375 const char *name = dentry->d_name.name; 376 int namelen = dentry->d_name.len; 377 int err; 378 379 UFSD(("ENTER, name %s, namelen %u\n", name, namelen)) 380 381 sb = dir->i_sb; 382 uspi = sb->u.ufs_sb.s_uspi; 383 384 if (!namelen) 385 return -EINVAL; 386 bh = ufs_bread (dir, 0, 0, &err); 387 if (!bh) 388 return err; 389 rec_len = UFS_DIR_REC_LEN(namelen); 390 offset = 0; 391 de = (struct ufs_dir_entry *) bh->b_data; 392 while (1) { 393 if ((char *)de >= UFS_SECTOR_SIZE + bh->b_data) { 394 fragoff = offset & ~uspi->s_fmask; 395 if (fragoff != 0 && fragoff != UFS_SECTOR_SIZE) 396 ufs_error (sb, "ufs_add_entry", "internal error" 397 " fragoff %u", fragoff); 398 if (!fragoff) { 399 brelse (bh); 400 bh = ufs_bread (dir, offset >> sb->s_blocksize_bits, 1, &err); 401 if (!bh) 402 return err; 403 } 404 if (dir->i_size <= offset) { 405 if (dir->i_size == 0) { 406 brelse(bh); 407 return -ENOENT; 408 } 409 de = (struct ufs_dir_entry *) (bh->b_data + fragoff); 410 de->d_ino = 0; 411 de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE); 412 ufs_set_de_namlen(sb, de, 0); 413 dir->i_size = offset + UFS_SECTOR_SIZE; 414 mark_inode_dirty(dir); 415 } else { 416 de = (struct ufs_dir_entry *) bh->b_data; 417 } 418 } 419 if (!ufs_check_dir_entry ("ufs_add_entry", dir, de, bh, offset)) { 420 brelse (bh); 421 return -ENOENT; 422 } 423 if (ufs_match(sb, namelen, name, de)) { 424 brelse (bh); 425 return -EEXIST; 426 } 427 if (de->d_ino == 0 && fs16_to_cpu(sb, de->d_reclen) >= rec_len) 428 break; 429 430 if (fs16_to_cpu(sb, de->d_reclen) >= 431 UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de)) + rec_len) 432 break; 433 offset += fs16_to_cpu(sb, de->d_reclen); 434 de = (struct ufs_dir_entry *) ((char *) de + fs16_to_cpu(sb, de->d_reclen)); 435 } 436 437 if (de->d_ino) { 438 de1 = (struct ufs_dir_entry *) ((char *) de + 439 UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de))); 440 de1->d_reclen = 441 cpu_to_fs16(sb, fs16_to_cpu(sb, de->d_reclen) - 442 UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de))); 443 de->d_reclen = 444 cpu_to_fs16(sb, UFS_DIR_REC_LEN(ufs_get_de_namlen(sb, de))); 445 de = de1; 446 } 447 de->d_ino = 0; 448 ufs_set_de_namlen(sb, de, namelen); 449 memcpy (de->d_name, name, namelen + 1); 450 de->d_ino = cpu_to_fs32(sb, inode->i_ino); 451 ufs_set_de_type(sb, de, inode->i_mode); 452 mark_buffer_dirty(bh); 453 if (IS_SYNC(dir)) { 454 ll_rw_block (WRITE, 1, &bh); 455 wait_on_buffer (bh); 456 } 457 brelse (bh); 458 dir->i_mtime = dir->i_ctime = CURRENT_TIME; 459 dir->i_version = ++event; 460 mark_inode_dirty(dir); 461 462 UFSD(("EXIT\n")) 463 return 0; 464 } 465 466 /* 467 * ufs_delete_entry deletes a directory entry by merging it with the 468 * previous entry. 469 */ 470 int ufs_delete_entry (struct inode * inode, struct ufs_dir_entry * dir, 471 struct buffer_head * bh ) 472 473 { 474 struct super_block * sb; 475 struct ufs_dir_entry * de, * pde; 476 unsigned i; 477 478 UFSD(("ENTER\n")) 479 480 sb = inode->i_sb; 481 i = 0; 482 pde = NULL; 483 de = (struct ufs_dir_entry *) bh->b_data; 484 485 UFSD(("ino %u, reclen %u, namlen %u, name %s\n", 486 fs32_to_cpu(sb, de->d_ino), 487 fs16to_cpu(sb, de->d_reclen), 488 ufs_get_de_namlen(sb, de), de->d_name)) 489 490 while (i < bh->b_size) { 491 if (!ufs_check_dir_entry ("ufs_delete_entry", inode, de, bh, i)) { 492 brelse(bh); 493 return -EIO; 494 } 495 if (de == dir) { 496 if (pde) 497 fs16_add(sb, &pde->d_reclen, 498 fs16_to_cpu(sb, dir->d_reclen)); 499 dir->d_ino = 0; 500 inode->i_version = ++event; 501 inode->i_ctime = inode->i_mtime = CURRENT_TIME; 502 mark_inode_dirty(inode); 503 mark_buffer_dirty(bh); 504 if (IS_SYNC(inode)) { 505 ll_rw_block(WRITE, 1, &bh); 506 wait_on_buffer(bh); 507 } 508 brelse(bh); 509 UFSD(("EXIT\n")) 510 return 0; 511 } 512 i += fs16_to_cpu(sb, de->d_reclen); 513 if (i == UFS_SECTOR_SIZE) pde = NULL; 514 else pde = de; 515 de = (struct ufs_dir_entry *) 516 ((char *) de + fs16_to_cpu(sb, de->d_reclen)); 517 if (i == UFS_SECTOR_SIZE && de->d_reclen == 0) 518 break; 519 } 520 UFSD(("EXIT\n")) 521 brelse(bh); 522 return -ENOENT; 523 } 524 525 int ufs_make_empty(struct inode * inode, struct inode *dir) 526 { 527 struct super_block * sb = dir->i_sb; 528 struct buffer_head * dir_block; 529 struct ufs_dir_entry * de; 530 int err; 531 532 dir_block = ufs_bread (inode, 0, 1, &err); 533 if (!dir_block) 534 return err; 535 536 inode->i_blocks = sb->s_blocksize / UFS_SECTOR_SIZE; 537 de = (struct ufs_dir_entry *) dir_block->b_data; 538 de->d_ino = cpu_to_fs32(sb, inode->i_ino); 539 ufs_set_de_type(sb, de, inode->i_mode); 540 ufs_set_de_namlen(sb, de, 1); 541 de->d_reclen = cpu_to_fs16(sb, UFS_DIR_REC_LEN(1)); 542 strcpy (de->d_name, "."); 543 de = (struct ufs_dir_entry *) 544 ((char *)de + fs16_to_cpu(sb, de->d_reclen)); 545 de->d_ino = cpu_to_fs32(sb, dir->i_ino); 546 ufs_set_de_type(sb, de, dir->i_mode); 547 de->d_reclen = cpu_to_fs16(sb, UFS_SECTOR_SIZE - UFS_DIR_REC_LEN(1)); 548 ufs_set_de_namlen(sb, de, 2); 549 strcpy (de->d_name, ".."); 550 mark_buffer_dirty(dir_block); 551 brelse (dir_block); 552 mark_inode_dirty(inode); 553 return 0; 554 } 555 556 /* 557 * routine to check that the specified directory is empty (for rmdir) 558 */ 559 int ufs_empty_dir (struct inode * inode) 560 { 561 struct super_block * sb; 562 unsigned long offset; 563 struct buffer_head * bh; 564 struct ufs_dir_entry * de, * de1; 565 int err; 566 567 sb = inode->i_sb; 568 569 if (inode->i_size < UFS_DIR_REC_LEN(1) + UFS_DIR_REC_LEN(2) || 570 !(bh = ufs_bread (inode, 0, 0, &err))) { 571 ufs_warning (inode->i_sb, "empty_dir", 572 "bad directory (dir #%lu) - no data block", 573 inode->i_ino); 574 return 1; 575 } 576 de = (struct ufs_dir_entry *) bh->b_data; 577 de1 = (struct ufs_dir_entry *) 578 ((char *)de + fs16_to_cpu(sb, de->d_reclen)); 579 if (fs32_to_cpu(sb, de->d_ino) != inode->i_ino || de1->d_ino == 0 || 580 strcmp (".", de->d_name) || strcmp ("..", de1->d_name)) { 581 ufs_warning (inode->i_sb, "empty_dir", 582 "bad directory (dir #%lu) - no `.' or `..'", 583 inode->i_ino); 584 return 1; 585 } 586 offset = fs16_to_cpu(sb, de->d_reclen) + fs16_to_cpu(sb, de1->d_reclen); 587 de = (struct ufs_dir_entry *) 588 ((char *)de1 + fs16_to_cpu(sb, de1->d_reclen)); 589 while (offset < inode->i_size ) { 590 if (!bh || (void *) de >= (void *) (bh->b_data + sb->s_blocksize)) { 591 brelse (bh); 592 bh = ufs_bread (inode, offset >> sb->s_blocksize_bits, 1, &err); 593 if (!bh) { 594 ufs_error (sb, "empty_dir", 595 "directory #%lu contains a hole at offset %lu", 596 inode->i_ino, offset); 597 offset += sb->s_blocksize; 598 continue; 599 } 600 de = (struct ufs_dir_entry *) bh->b_data; 601 } 602 if (!ufs_check_dir_entry ("empty_dir", inode, de, bh, offset)) { 603 brelse (bh); 604 return 1; 605 } 606 if (de->d_ino) { 607 brelse (bh); 608 return 0; 609 } 610 offset += fs16_to_cpu(sb, de->d_reclen); 611 de = (struct ufs_dir_entry *) 612 ((char *)de + fs16_to_cpu(sb, de->d_reclen)); 613 } 614 brelse (bh); 615 return 1; 616 } 617 618 struct file_operations ufs_dir_operations = { 619 read: generic_read_dir, 620 readdir: ufs_readdir, 621 fsync: file_fsync, 622 };
Cache object: 1adfa3e5afc9e8f2244d951280f7f1ce
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