1 /* 2 * linux/fs/hpfs/namei.c 3 * 4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 5 * 6 * adding & removing files & directories 7 */ 8 #include <linux/sched.h> 9 #include "hpfs_fn.h" 10 11 static void hpfs_update_directory_times(struct inode *dir) 12 { 13 time_t t = get_seconds(); 14 if (t == dir->i_mtime.tv_sec && 15 t == dir->i_ctime.tv_sec) 16 return; 17 dir->i_mtime.tv_sec = dir->i_ctime.tv_sec = t; 18 dir->i_mtime.tv_nsec = dir->i_ctime.tv_nsec = 0; 19 hpfs_write_inode_nolock(dir); 20 } 21 22 static int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 23 { 24 const unsigned char *name = dentry->d_name.name; 25 unsigned len = dentry->d_name.len; 26 struct quad_buffer_head qbh0; 27 struct buffer_head *bh; 28 struct hpfs_dirent *de; 29 struct fnode *fnode; 30 struct dnode *dnode; 31 struct inode *result; 32 fnode_secno fno; 33 dnode_secno dno; 34 int r; 35 struct hpfs_dirent dee; 36 int err; 37 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 38 hpfs_lock(dir->i_sb); 39 err = -ENOSPC; 40 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 41 if (!fnode) 42 goto bail; 43 dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0); 44 if (!dnode) 45 goto bail1; 46 memset(&dee, 0, sizeof dee); 47 dee.directory = 1; 48 if (!(mode & 0222)) dee.read_only = 1; 49 /*dee.archive = 0;*/ 50 dee.hidden = name[0] == '.'; 51 dee.fnode = cpu_to_le32(fno); 52 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 53 result = new_inode(dir->i_sb); 54 if (!result) 55 goto bail2; 56 hpfs_init_inode(result); 57 result->i_ino = fno; 58 hpfs_i(result)->i_parent_dir = dir->i_ino; 59 hpfs_i(result)->i_dno = dno; 60 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)); 61 result->i_ctime.tv_nsec = 0; 62 result->i_mtime.tv_nsec = 0; 63 result->i_atime.tv_nsec = 0; 64 hpfs_i(result)->i_ea_size = 0; 65 result->i_mode |= S_IFDIR; 66 result->i_op = &hpfs_dir_iops; 67 result->i_fop = &hpfs_dir_ops; 68 result->i_blocks = 4; 69 result->i_size = 2048; 70 set_nlink(result, 2); 71 if (dee.read_only) 72 result->i_mode &= ~0222; 73 74 r = hpfs_add_dirent(dir, name, len, &dee); 75 if (r == 1) 76 goto bail3; 77 if (r == -1) { 78 err = -EEXIST; 79 goto bail3; 80 } 81 fnode->len = len; 82 memcpy(fnode->name, name, len > 15 ? 15 : len); 83 fnode->up = cpu_to_le32(dir->i_ino); 84 fnode->flags |= FNODE_dir; 85 fnode->btree.n_free_nodes = 7; 86 fnode->btree.n_used_nodes = 1; 87 fnode->btree.first_free = cpu_to_le16(0x14); 88 fnode->u.external[0].disk_secno = cpu_to_le32(dno); 89 fnode->u.external[0].file_secno = cpu_to_le32(-1); 90 dnode->root_dnode = 1; 91 dnode->up = cpu_to_le32(fno); 92 de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0); 93 de->creation_date = de->write_date = de->read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 94 if (!(mode & 0222)) de->read_only = 1; 95 de->first = de->directory = 1; 96 /*de->hidden = de->system = 0;*/ 97 de->fnode = cpu_to_le32(fno); 98 mark_buffer_dirty(bh); 99 brelse(bh); 100 hpfs_mark_4buffers_dirty(&qbh0); 101 hpfs_brelse4(&qbh0); 102 inc_nlink(dir); 103 insert_inode_hash(result); 104 105 if (!uid_eq(result->i_uid, current_fsuid()) || 106 !gid_eq(result->i_gid, current_fsgid()) || 107 result->i_mode != (mode | S_IFDIR)) { 108 result->i_uid = current_fsuid(); 109 result->i_gid = current_fsgid(); 110 result->i_mode = mode | S_IFDIR; 111 hpfs_write_inode_nolock(result); 112 } 113 hpfs_update_directory_times(dir); 114 d_instantiate(dentry, result); 115 hpfs_unlock(dir->i_sb); 116 return 0; 117 bail3: 118 iput(result); 119 bail2: 120 hpfs_brelse4(&qbh0); 121 hpfs_free_dnode(dir->i_sb, dno); 122 bail1: 123 brelse(bh); 124 hpfs_free_sectors(dir->i_sb, fno, 1); 125 bail: 126 hpfs_unlock(dir->i_sb); 127 return err; 128 } 129 130 static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) 131 { 132 const unsigned char *name = dentry->d_name.name; 133 unsigned len = dentry->d_name.len; 134 struct inode *result = NULL; 135 struct buffer_head *bh; 136 struct fnode *fnode; 137 fnode_secno fno; 138 int r; 139 struct hpfs_dirent dee; 140 int err; 141 if ((err = hpfs_chk_name(name, &len))) 142 return err==-ENOENT ? -EINVAL : err; 143 hpfs_lock(dir->i_sb); 144 err = -ENOSPC; 145 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 146 if (!fnode) 147 goto bail; 148 memset(&dee, 0, sizeof dee); 149 if (!(mode & 0222)) dee.read_only = 1; 150 dee.archive = 1; 151 dee.hidden = name[0] == '.'; 152 dee.fnode = cpu_to_le32(fno); 153 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 154 155 result = new_inode(dir->i_sb); 156 if (!result) 157 goto bail1; 158 159 hpfs_init_inode(result); 160 result->i_ino = fno; 161 result->i_mode |= S_IFREG; 162 result->i_mode &= ~0111; 163 result->i_op = &hpfs_file_iops; 164 result->i_fop = &hpfs_file_ops; 165 set_nlink(result, 1); 166 hpfs_i(result)->i_parent_dir = dir->i_ino; 167 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)); 168 result->i_ctime.tv_nsec = 0; 169 result->i_mtime.tv_nsec = 0; 170 result->i_atime.tv_nsec = 0; 171 hpfs_i(result)->i_ea_size = 0; 172 if (dee.read_only) 173 result->i_mode &= ~0222; 174 result->i_blocks = 1; 175 result->i_size = 0; 176 result->i_data.a_ops = &hpfs_aops; 177 hpfs_i(result)->mmu_private = 0; 178 179 r = hpfs_add_dirent(dir, name, len, &dee); 180 if (r == 1) 181 goto bail2; 182 if (r == -1) { 183 err = -EEXIST; 184 goto bail2; 185 } 186 fnode->len = len; 187 memcpy(fnode->name, name, len > 15 ? 15 : len); 188 fnode->up = cpu_to_le32(dir->i_ino); 189 mark_buffer_dirty(bh); 190 brelse(bh); 191 192 insert_inode_hash(result); 193 194 if (!uid_eq(result->i_uid, current_fsuid()) || 195 !gid_eq(result->i_gid, current_fsgid()) || 196 result->i_mode != (mode | S_IFREG)) { 197 result->i_uid = current_fsuid(); 198 result->i_gid = current_fsgid(); 199 result->i_mode = mode | S_IFREG; 200 hpfs_write_inode_nolock(result); 201 } 202 hpfs_update_directory_times(dir); 203 d_instantiate(dentry, result); 204 hpfs_unlock(dir->i_sb); 205 return 0; 206 207 bail2: 208 iput(result); 209 bail1: 210 brelse(bh); 211 hpfs_free_sectors(dir->i_sb, fno, 1); 212 bail: 213 hpfs_unlock(dir->i_sb); 214 return err; 215 } 216 217 static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 218 { 219 const unsigned char *name = dentry->d_name.name; 220 unsigned len = dentry->d_name.len; 221 struct buffer_head *bh; 222 struct fnode *fnode; 223 fnode_secno fno; 224 int r; 225 struct hpfs_dirent dee; 226 struct inode *result = NULL; 227 int err; 228 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 229 if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM; 230 hpfs_lock(dir->i_sb); 231 err = -ENOSPC; 232 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 233 if (!fnode) 234 goto bail; 235 memset(&dee, 0, sizeof dee); 236 if (!(mode & 0222)) dee.read_only = 1; 237 dee.archive = 1; 238 dee.hidden = name[0] == '.'; 239 dee.fnode = cpu_to_le32(fno); 240 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 241 242 result = new_inode(dir->i_sb); 243 if (!result) 244 goto bail1; 245 246 hpfs_init_inode(result); 247 result->i_ino = fno; 248 hpfs_i(result)->i_parent_dir = dir->i_ino; 249 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)); 250 result->i_ctime.tv_nsec = 0; 251 result->i_mtime.tv_nsec = 0; 252 result->i_atime.tv_nsec = 0; 253 hpfs_i(result)->i_ea_size = 0; 254 result->i_uid = current_fsuid(); 255 result->i_gid = current_fsgid(); 256 set_nlink(result, 1); 257 result->i_size = 0; 258 result->i_blocks = 1; 259 init_special_inode(result, mode, rdev); 260 261 r = hpfs_add_dirent(dir, name, len, &dee); 262 if (r == 1) 263 goto bail2; 264 if (r == -1) { 265 err = -EEXIST; 266 goto bail2; 267 } 268 fnode->len = len; 269 memcpy(fnode->name, name, len > 15 ? 15 : len); 270 fnode->up = cpu_to_le32(dir->i_ino); 271 mark_buffer_dirty(bh); 272 273 insert_inode_hash(result); 274 275 hpfs_write_inode_nolock(result); 276 hpfs_update_directory_times(dir); 277 d_instantiate(dentry, result); 278 brelse(bh); 279 hpfs_unlock(dir->i_sb); 280 return 0; 281 bail2: 282 iput(result); 283 bail1: 284 brelse(bh); 285 hpfs_free_sectors(dir->i_sb, fno, 1); 286 bail: 287 hpfs_unlock(dir->i_sb); 288 return err; 289 } 290 291 static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink) 292 { 293 const unsigned char *name = dentry->d_name.name; 294 unsigned len = dentry->d_name.len; 295 struct buffer_head *bh; 296 struct fnode *fnode; 297 fnode_secno fno; 298 int r; 299 struct hpfs_dirent dee; 300 struct inode *result; 301 int err; 302 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 303 hpfs_lock(dir->i_sb); 304 if (hpfs_sb(dir->i_sb)->sb_eas < 2) { 305 hpfs_unlock(dir->i_sb); 306 return -EPERM; 307 } 308 err = -ENOSPC; 309 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 310 if (!fnode) 311 goto bail; 312 memset(&dee, 0, sizeof dee); 313 dee.archive = 1; 314 dee.hidden = name[0] == '.'; 315 dee.fnode = cpu_to_le32(fno); 316 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 317 318 result = new_inode(dir->i_sb); 319 if (!result) 320 goto bail1; 321 result->i_ino = fno; 322 hpfs_init_inode(result); 323 hpfs_i(result)->i_parent_dir = dir->i_ino; 324 result->i_ctime.tv_sec = result->i_mtime.tv_sec = result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(dee.creation_date)); 325 result->i_ctime.tv_nsec = 0; 326 result->i_mtime.tv_nsec = 0; 327 result->i_atime.tv_nsec = 0; 328 hpfs_i(result)->i_ea_size = 0; 329 result->i_mode = S_IFLNK | 0777; 330 result->i_uid = current_fsuid(); 331 result->i_gid = current_fsgid(); 332 result->i_blocks = 1; 333 set_nlink(result, 1); 334 result->i_size = strlen(symlink); 335 inode_nohighmem(result); 336 result->i_op = &page_symlink_inode_operations; 337 result->i_data.a_ops = &hpfs_symlink_aops; 338 339 r = hpfs_add_dirent(dir, name, len, &dee); 340 if (r == 1) 341 goto bail2; 342 if (r == -1) { 343 err = -EEXIST; 344 goto bail2; 345 } 346 fnode->len = len; 347 memcpy(fnode->name, name, len > 15 ? 15 : len); 348 fnode->up = cpu_to_le32(dir->i_ino); 349 hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink)); 350 mark_buffer_dirty(bh); 351 brelse(bh); 352 353 insert_inode_hash(result); 354 355 hpfs_write_inode_nolock(result); 356 hpfs_update_directory_times(dir); 357 d_instantiate(dentry, result); 358 hpfs_unlock(dir->i_sb); 359 return 0; 360 bail2: 361 iput(result); 362 bail1: 363 brelse(bh); 364 hpfs_free_sectors(dir->i_sb, fno, 1); 365 bail: 366 hpfs_unlock(dir->i_sb); 367 return err; 368 } 369 370 static int hpfs_unlink(struct inode *dir, struct dentry *dentry) 371 { 372 const unsigned char *name = dentry->d_name.name; 373 unsigned len = dentry->d_name.len; 374 struct quad_buffer_head qbh; 375 struct hpfs_dirent *de; 376 struct inode *inode = d_inode(dentry); 377 dnode_secno dno; 378 int r; 379 int err; 380 381 hpfs_lock(dir->i_sb); 382 hpfs_adjust_length(name, &len); 383 384 err = -ENOENT; 385 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 386 if (!de) 387 goto out; 388 389 err = -EPERM; 390 if (de->first) 391 goto out1; 392 393 err = -EISDIR; 394 if (de->directory) 395 goto out1; 396 397 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 398 switch (r) { 399 case 1: 400 hpfs_error(dir->i_sb, "there was error when removing dirent"); 401 err = -EFSERROR; 402 break; 403 case 2: /* no space for deleting */ 404 err = -ENOSPC; 405 break; 406 default: 407 drop_nlink(inode); 408 err = 0; 409 } 410 goto out; 411 412 out1: 413 hpfs_brelse4(&qbh); 414 out: 415 if (!err) 416 hpfs_update_directory_times(dir); 417 hpfs_unlock(dir->i_sb); 418 return err; 419 } 420 421 static int hpfs_rmdir(struct inode *dir, struct dentry *dentry) 422 { 423 const unsigned char *name = dentry->d_name.name; 424 unsigned len = dentry->d_name.len; 425 struct quad_buffer_head qbh; 426 struct hpfs_dirent *de; 427 struct inode *inode = d_inode(dentry); 428 dnode_secno dno; 429 int n_items = 0; 430 int err; 431 int r; 432 433 hpfs_adjust_length(name, &len); 434 hpfs_lock(dir->i_sb); 435 err = -ENOENT; 436 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 437 if (!de) 438 goto out; 439 440 err = -EPERM; 441 if (de->first) 442 goto out1; 443 444 err = -ENOTDIR; 445 if (!de->directory) 446 goto out1; 447 448 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items); 449 err = -ENOTEMPTY; 450 if (n_items) 451 goto out1; 452 453 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 454 switch (r) { 455 case 1: 456 hpfs_error(dir->i_sb, "there was error when removing dirent"); 457 err = -EFSERROR; 458 break; 459 case 2: 460 err = -ENOSPC; 461 break; 462 default: 463 drop_nlink(dir); 464 clear_nlink(inode); 465 err = 0; 466 } 467 goto out; 468 out1: 469 hpfs_brelse4(&qbh); 470 out: 471 if (!err) 472 hpfs_update_directory_times(dir); 473 hpfs_unlock(dir->i_sb); 474 return err; 475 } 476 477 static int hpfs_symlink_readpage(struct file *file, struct page *page) 478 { 479 char *link = page_address(page); 480 struct inode *i = page->mapping->host; 481 struct fnode *fnode; 482 struct buffer_head *bh; 483 int err; 484 485 err = -EIO; 486 hpfs_lock(i->i_sb); 487 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) 488 goto fail; 489 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE); 490 brelse(bh); 491 if (err) 492 goto fail; 493 hpfs_unlock(i->i_sb); 494 SetPageUptodate(page); 495 unlock_page(page); 496 return 0; 497 498 fail: 499 hpfs_unlock(i->i_sb); 500 SetPageError(page); 501 unlock_page(page); 502 return err; 503 } 504 505 const struct address_space_operations hpfs_symlink_aops = { 506 .readpage = hpfs_symlink_readpage 507 }; 508 509 static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, 510 struct inode *new_dir, struct dentry *new_dentry) 511 { 512 const unsigned char *old_name = old_dentry->d_name.name; 513 unsigned old_len = old_dentry->d_name.len; 514 const unsigned char *new_name = new_dentry->d_name.name; 515 unsigned new_len = new_dentry->d_name.len; 516 struct inode *i = d_inode(old_dentry); 517 struct inode *new_inode = d_inode(new_dentry); 518 struct quad_buffer_head qbh, qbh1; 519 struct hpfs_dirent *dep, *nde; 520 struct hpfs_dirent de; 521 dnode_secno dno; 522 int r; 523 struct buffer_head *bh; 524 struct fnode *fnode; 525 int err; 526 527 if ((err = hpfs_chk_name(new_name, &new_len))) return err; 528 err = 0; 529 hpfs_adjust_length(old_name, &old_len); 530 531 hpfs_lock(i->i_sb); 532 /* order doesn't matter, due to VFS exclusion */ 533 534 /* Erm? Moving over the empty non-busy directory is perfectly legal */ 535 if (new_inode && S_ISDIR(new_inode->i_mode)) { 536 err = -EINVAL; 537 goto end1; 538 } 539 540 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 541 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed"); 542 err = -ENOENT; 543 goto end1; 544 } 545 copy_de(&de, dep); 546 de.hidden = new_name[0] == '.'; 547 548 if (new_inode) { 549 int r; 550 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) { 551 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) { 552 clear_nlink(new_inode); 553 copy_de(nde, &de); 554 memcpy(nde->name, new_name, new_len); 555 hpfs_mark_4buffers_dirty(&qbh1); 556 hpfs_brelse4(&qbh1); 557 goto end; 558 } 559 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent"); 560 err = -EFSERROR; 561 goto end1; 562 } 563 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0; 564 goto end1; 565 } 566 567 if (new_dir == old_dir) hpfs_brelse4(&qbh); 568 569 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) { 570 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!"); 571 err = r == 1 ? -ENOSPC : -EFSERROR; 572 if (new_dir != old_dir) hpfs_brelse4(&qbh); 573 goto end1; 574 } 575 576 if (new_dir == old_dir) 577 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 578 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2"); 579 err = -ENOENT; 580 goto end1; 581 } 582 583 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) { 584 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent"); 585 err = r == 2 ? -ENOSPC : -EFSERROR; 586 goto end1; 587 } 588 589 end: 590 hpfs_i(i)->i_parent_dir = new_dir->i_ino; 591 if (S_ISDIR(i->i_mode)) { 592 inc_nlink(new_dir); 593 drop_nlink(old_dir); 594 } 595 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) { 596 fnode->up = cpu_to_le32(new_dir->i_ino); 597 fnode->len = new_len; 598 memcpy(fnode->name, new_name, new_len>15?15:new_len); 599 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len); 600 mark_buffer_dirty(bh); 601 brelse(bh); 602 } 603 end1: 604 if (!err) { 605 hpfs_update_directory_times(old_dir); 606 hpfs_update_directory_times(new_dir); 607 } 608 hpfs_unlock(i->i_sb); 609 return err; 610 } 611 612 const struct inode_operations hpfs_dir_iops = 613 { 614 .create = hpfs_create, 615 .lookup = hpfs_lookup, 616 .unlink = hpfs_unlink, 617 .symlink = hpfs_symlink, 618 .mkdir = hpfs_mkdir, 619 .rmdir = hpfs_rmdir, 620 .mknod = hpfs_mknod, 621 .rename = hpfs_rename, 622 .setattr = hpfs_setattr, 623 }; 624