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 int hpfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 12 { 13 const unsigned char *name = dentry->d_name.name; 14 unsigned len = dentry->d_name.len; 15 struct quad_buffer_head qbh0; 16 struct buffer_head *bh; 17 struct hpfs_dirent *de; 18 struct fnode *fnode; 19 struct dnode *dnode; 20 struct inode *result; 21 fnode_secno fno; 22 dnode_secno dno; 23 int r; 24 struct hpfs_dirent dee; 25 int err; 26 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 27 hpfs_lock(dir->i_sb); 28 err = -ENOSPC; 29 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 30 if (!fnode) 31 goto bail; 32 dnode = hpfs_alloc_dnode(dir->i_sb, fno, &dno, &qbh0); 33 if (!dnode) 34 goto bail1; 35 memset(&dee, 0, sizeof dee); 36 dee.directory = 1; 37 if (!(mode & 0222)) dee.read_only = 1; 38 /*dee.archive = 0;*/ 39 dee.hidden = name[0] == '.'; 40 dee.fnode = cpu_to_le32(fno); 41 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 42 result = new_inode(dir->i_sb); 43 if (!result) 44 goto bail2; 45 hpfs_init_inode(result); 46 result->i_ino = fno; 47 hpfs_i(result)->i_parent_dir = dir->i_ino; 48 hpfs_i(result)->i_dno = dno; 49 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)); 50 result->i_ctime.tv_nsec = 0; 51 result->i_mtime.tv_nsec = 0; 52 result->i_atime.tv_nsec = 0; 53 hpfs_i(result)->i_ea_size = 0; 54 result->i_mode |= S_IFDIR; 55 result->i_op = &hpfs_dir_iops; 56 result->i_fop = &hpfs_dir_ops; 57 result->i_blocks = 4; 58 result->i_size = 2048; 59 set_nlink(result, 2); 60 if (dee.read_only) 61 result->i_mode &= ~0222; 62 63 r = hpfs_add_dirent(dir, name, len, &dee); 64 if (r == 1) 65 goto bail3; 66 if (r == -1) { 67 err = -EEXIST; 68 goto bail3; 69 } 70 fnode->len = len; 71 memcpy(fnode->name, name, len > 15 ? 15 : len); 72 fnode->up = cpu_to_le32(dir->i_ino); 73 fnode->flags |= FNODE_dir; 74 fnode->btree.n_free_nodes = 7; 75 fnode->btree.n_used_nodes = 1; 76 fnode->btree.first_free = cpu_to_le16(0x14); 77 fnode->u.external[0].disk_secno = cpu_to_le32(dno); 78 fnode->u.external[0].file_secno = cpu_to_le32(-1); 79 dnode->root_dnode = 1; 80 dnode->up = cpu_to_le32(fno); 81 de = hpfs_add_de(dir->i_sb, dnode, "\001\001", 2, 0); 82 de->creation_date = de->write_date = de->read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 83 if (!(mode & 0222)) de->read_only = 1; 84 de->first = de->directory = 1; 85 /*de->hidden = de->system = 0;*/ 86 de->fnode = cpu_to_le32(fno); 87 mark_buffer_dirty(bh); 88 brelse(bh); 89 hpfs_mark_4buffers_dirty(&qbh0); 90 hpfs_brelse4(&qbh0); 91 inc_nlink(dir); 92 insert_inode_hash(result); 93 94 if (!uid_eq(result->i_uid, current_fsuid()) || 95 !gid_eq(result->i_gid, current_fsgid()) || 96 result->i_mode != (mode | S_IFDIR)) { 97 result->i_uid = current_fsuid(); 98 result->i_gid = current_fsgid(); 99 result->i_mode = mode | S_IFDIR; 100 hpfs_write_inode_nolock(result); 101 } 102 d_instantiate(dentry, result); 103 hpfs_unlock(dir->i_sb); 104 return 0; 105 bail3: 106 iput(result); 107 bail2: 108 hpfs_brelse4(&qbh0); 109 hpfs_free_dnode(dir->i_sb, dno); 110 bail1: 111 brelse(bh); 112 hpfs_free_sectors(dir->i_sb, fno, 1); 113 bail: 114 hpfs_unlock(dir->i_sb); 115 return err; 116 } 117 118 static int hpfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) 119 { 120 const unsigned char *name = dentry->d_name.name; 121 unsigned len = dentry->d_name.len; 122 struct inode *result = NULL; 123 struct buffer_head *bh; 124 struct fnode *fnode; 125 fnode_secno fno; 126 int r; 127 struct hpfs_dirent dee; 128 int err; 129 if ((err = hpfs_chk_name(name, &len))) 130 return err==-ENOENT ? -EINVAL : err; 131 hpfs_lock(dir->i_sb); 132 err = -ENOSPC; 133 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 134 if (!fnode) 135 goto bail; 136 memset(&dee, 0, sizeof dee); 137 if (!(mode & 0222)) dee.read_only = 1; 138 dee.archive = 1; 139 dee.hidden = name[0] == '.'; 140 dee.fnode = cpu_to_le32(fno); 141 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 142 143 result = new_inode(dir->i_sb); 144 if (!result) 145 goto bail1; 146 147 hpfs_init_inode(result); 148 result->i_ino = fno; 149 result->i_mode |= S_IFREG; 150 result->i_mode &= ~0111; 151 result->i_op = &hpfs_file_iops; 152 result->i_fop = &hpfs_file_ops; 153 set_nlink(result, 1); 154 hpfs_i(result)->i_parent_dir = dir->i_ino; 155 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)); 156 result->i_ctime.tv_nsec = 0; 157 result->i_mtime.tv_nsec = 0; 158 result->i_atime.tv_nsec = 0; 159 hpfs_i(result)->i_ea_size = 0; 160 if (dee.read_only) 161 result->i_mode &= ~0222; 162 result->i_blocks = 1; 163 result->i_size = 0; 164 result->i_data.a_ops = &hpfs_aops; 165 hpfs_i(result)->mmu_private = 0; 166 167 r = hpfs_add_dirent(dir, name, len, &dee); 168 if (r == 1) 169 goto bail2; 170 if (r == -1) { 171 err = -EEXIST; 172 goto bail2; 173 } 174 fnode->len = len; 175 memcpy(fnode->name, name, len > 15 ? 15 : len); 176 fnode->up = cpu_to_le32(dir->i_ino); 177 mark_buffer_dirty(bh); 178 brelse(bh); 179 180 insert_inode_hash(result); 181 182 if (!uid_eq(result->i_uid, current_fsuid()) || 183 !gid_eq(result->i_gid, current_fsgid()) || 184 result->i_mode != (mode | S_IFREG)) { 185 result->i_uid = current_fsuid(); 186 result->i_gid = current_fsgid(); 187 result->i_mode = mode | S_IFREG; 188 hpfs_write_inode_nolock(result); 189 } 190 d_instantiate(dentry, result); 191 hpfs_unlock(dir->i_sb); 192 return 0; 193 194 bail2: 195 iput(result); 196 bail1: 197 brelse(bh); 198 hpfs_free_sectors(dir->i_sb, fno, 1); 199 bail: 200 hpfs_unlock(dir->i_sb); 201 return err; 202 } 203 204 static int hpfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 205 { 206 const unsigned char *name = dentry->d_name.name; 207 unsigned len = dentry->d_name.len; 208 struct buffer_head *bh; 209 struct fnode *fnode; 210 fnode_secno fno; 211 int r; 212 struct hpfs_dirent dee; 213 struct inode *result = NULL; 214 int err; 215 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 216 if (hpfs_sb(dir->i_sb)->sb_eas < 2) return -EPERM; 217 if (!new_valid_dev(rdev)) 218 return -EINVAL; 219 hpfs_lock(dir->i_sb); 220 err = -ENOSPC; 221 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 222 if (!fnode) 223 goto bail; 224 memset(&dee, 0, sizeof dee); 225 if (!(mode & 0222)) dee.read_only = 1; 226 dee.archive = 1; 227 dee.hidden = name[0] == '.'; 228 dee.fnode = cpu_to_le32(fno); 229 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 230 231 result = new_inode(dir->i_sb); 232 if (!result) 233 goto bail1; 234 235 hpfs_init_inode(result); 236 result->i_ino = fno; 237 hpfs_i(result)->i_parent_dir = dir->i_ino; 238 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)); 239 result->i_ctime.tv_nsec = 0; 240 result->i_mtime.tv_nsec = 0; 241 result->i_atime.tv_nsec = 0; 242 hpfs_i(result)->i_ea_size = 0; 243 result->i_uid = current_fsuid(); 244 result->i_gid = current_fsgid(); 245 set_nlink(result, 1); 246 result->i_size = 0; 247 result->i_blocks = 1; 248 init_special_inode(result, mode, rdev); 249 250 r = hpfs_add_dirent(dir, name, len, &dee); 251 if (r == 1) 252 goto bail2; 253 if (r == -1) { 254 err = -EEXIST; 255 goto bail2; 256 } 257 fnode->len = len; 258 memcpy(fnode->name, name, len > 15 ? 15 : len); 259 fnode->up = cpu_to_le32(dir->i_ino); 260 mark_buffer_dirty(bh); 261 262 insert_inode_hash(result); 263 264 hpfs_write_inode_nolock(result); 265 d_instantiate(dentry, result); 266 brelse(bh); 267 hpfs_unlock(dir->i_sb); 268 return 0; 269 bail2: 270 iput(result); 271 bail1: 272 brelse(bh); 273 hpfs_free_sectors(dir->i_sb, fno, 1); 274 bail: 275 hpfs_unlock(dir->i_sb); 276 return err; 277 } 278 279 static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink) 280 { 281 const unsigned char *name = dentry->d_name.name; 282 unsigned len = dentry->d_name.len; 283 struct buffer_head *bh; 284 struct fnode *fnode; 285 fnode_secno fno; 286 int r; 287 struct hpfs_dirent dee; 288 struct inode *result; 289 int err; 290 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 291 hpfs_lock(dir->i_sb); 292 if (hpfs_sb(dir->i_sb)->sb_eas < 2) { 293 hpfs_unlock(dir->i_sb); 294 return -EPERM; 295 } 296 err = -ENOSPC; 297 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 298 if (!fnode) 299 goto bail; 300 memset(&dee, 0, sizeof dee); 301 dee.archive = 1; 302 dee.hidden = name[0] == '.'; 303 dee.fnode = cpu_to_le32(fno); 304 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 305 306 result = new_inode(dir->i_sb); 307 if (!result) 308 goto bail1; 309 result->i_ino = fno; 310 hpfs_init_inode(result); 311 hpfs_i(result)->i_parent_dir = dir->i_ino; 312 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)); 313 result->i_ctime.tv_nsec = 0; 314 result->i_mtime.tv_nsec = 0; 315 result->i_atime.tv_nsec = 0; 316 hpfs_i(result)->i_ea_size = 0; 317 result->i_mode = S_IFLNK | 0777; 318 result->i_uid = current_fsuid(); 319 result->i_gid = current_fsgid(); 320 result->i_blocks = 1; 321 set_nlink(result, 1); 322 result->i_size = strlen(symlink); 323 result->i_op = &page_symlink_inode_operations; 324 result->i_data.a_ops = &hpfs_symlink_aops; 325 326 r = hpfs_add_dirent(dir, name, len, &dee); 327 if (r == 1) 328 goto bail2; 329 if (r == -1) { 330 err = -EEXIST; 331 goto bail2; 332 } 333 fnode->len = len; 334 memcpy(fnode->name, name, len > 15 ? 15 : len); 335 fnode->up = cpu_to_le32(dir->i_ino); 336 hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink)); 337 mark_buffer_dirty(bh); 338 brelse(bh); 339 340 insert_inode_hash(result); 341 342 hpfs_write_inode_nolock(result); 343 d_instantiate(dentry, result); 344 hpfs_unlock(dir->i_sb); 345 return 0; 346 bail2: 347 iput(result); 348 bail1: 349 brelse(bh); 350 hpfs_free_sectors(dir->i_sb, fno, 1); 351 bail: 352 hpfs_unlock(dir->i_sb); 353 return err; 354 } 355 356 static int hpfs_unlink(struct inode *dir, struct dentry *dentry) 357 { 358 const unsigned char *name = dentry->d_name.name; 359 unsigned len = dentry->d_name.len; 360 struct quad_buffer_head qbh; 361 struct hpfs_dirent *de; 362 struct inode *inode = d_inode(dentry); 363 dnode_secno dno; 364 int r; 365 int rep = 0; 366 int err; 367 368 hpfs_lock(dir->i_sb); 369 hpfs_adjust_length(name, &len); 370 again: 371 err = -ENOENT; 372 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 373 if (!de) 374 goto out; 375 376 err = -EPERM; 377 if (de->first) 378 goto out1; 379 380 err = -EISDIR; 381 if (de->directory) 382 goto out1; 383 384 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 385 switch (r) { 386 case 1: 387 hpfs_error(dir->i_sb, "there was error when removing dirent"); 388 err = -EFSERROR; 389 break; 390 case 2: /* no space for deleting, try to truncate file */ 391 392 err = -ENOSPC; 393 if (rep++) 394 break; 395 396 dentry_unhash(dentry); 397 if (!d_unhashed(dentry)) { 398 hpfs_unlock(dir->i_sb); 399 return -ENOSPC; 400 } 401 if (generic_permission(inode, MAY_WRITE) || 402 !S_ISREG(inode->i_mode) || 403 get_write_access(inode)) { 404 d_rehash(dentry); 405 } else { 406 struct iattr newattrs; 407 /*pr_info("truncating file before delete.\n");*/ 408 newattrs.ia_size = 0; 409 newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME; 410 err = notify_change(dentry, &newattrs, NULL); 411 put_write_access(inode); 412 if (!err) 413 goto again; 414 } 415 hpfs_unlock(dir->i_sb); 416 return -ENOSPC; 417 default: 418 drop_nlink(inode); 419 err = 0; 420 } 421 goto out; 422 423 out1: 424 hpfs_brelse4(&qbh); 425 out: 426 hpfs_unlock(dir->i_sb); 427 return err; 428 } 429 430 static int hpfs_rmdir(struct inode *dir, struct dentry *dentry) 431 { 432 const unsigned char *name = dentry->d_name.name; 433 unsigned len = dentry->d_name.len; 434 struct quad_buffer_head qbh; 435 struct hpfs_dirent *de; 436 struct inode *inode = d_inode(dentry); 437 dnode_secno dno; 438 int n_items = 0; 439 int err; 440 int r; 441 442 hpfs_adjust_length(name, &len); 443 hpfs_lock(dir->i_sb); 444 err = -ENOENT; 445 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 446 if (!de) 447 goto out; 448 449 err = -EPERM; 450 if (de->first) 451 goto out1; 452 453 err = -ENOTDIR; 454 if (!de->directory) 455 goto out1; 456 457 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items); 458 err = -ENOTEMPTY; 459 if (n_items) 460 goto out1; 461 462 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 463 switch (r) { 464 case 1: 465 hpfs_error(dir->i_sb, "there was error when removing dirent"); 466 err = -EFSERROR; 467 break; 468 case 2: 469 err = -ENOSPC; 470 break; 471 default: 472 drop_nlink(dir); 473 clear_nlink(inode); 474 err = 0; 475 } 476 goto out; 477 out1: 478 hpfs_brelse4(&qbh); 479 out: 480 hpfs_unlock(dir->i_sb); 481 return err; 482 } 483 484 static int hpfs_symlink_readpage(struct file *file, struct page *page) 485 { 486 char *link = kmap(page); 487 struct inode *i = page->mapping->host; 488 struct fnode *fnode; 489 struct buffer_head *bh; 490 int err; 491 492 err = -EIO; 493 hpfs_lock(i->i_sb); 494 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) 495 goto fail; 496 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE); 497 brelse(bh); 498 if (err) 499 goto fail; 500 hpfs_unlock(i->i_sb); 501 SetPageUptodate(page); 502 kunmap(page); 503 unlock_page(page); 504 return 0; 505 506 fail: 507 hpfs_unlock(i->i_sb); 508 SetPageError(page); 509 kunmap(page); 510 unlock_page(page); 511 return err; 512 } 513 514 const struct address_space_operations hpfs_symlink_aops = { 515 .readpage = hpfs_symlink_readpage 516 }; 517 518 static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, 519 struct inode *new_dir, struct dentry *new_dentry) 520 { 521 const unsigned char *old_name = old_dentry->d_name.name; 522 unsigned old_len = old_dentry->d_name.len; 523 const unsigned char *new_name = new_dentry->d_name.name; 524 unsigned new_len = new_dentry->d_name.len; 525 struct inode *i = d_inode(old_dentry); 526 struct inode *new_inode = d_inode(new_dentry); 527 struct quad_buffer_head qbh, qbh1; 528 struct hpfs_dirent *dep, *nde; 529 struct hpfs_dirent de; 530 dnode_secno dno; 531 int r; 532 struct buffer_head *bh; 533 struct fnode *fnode; 534 int err; 535 536 if ((err = hpfs_chk_name(new_name, &new_len))) return err; 537 err = 0; 538 hpfs_adjust_length(old_name, &old_len); 539 540 hpfs_lock(i->i_sb); 541 /* order doesn't matter, due to VFS exclusion */ 542 543 /* Erm? Moving over the empty non-busy directory is perfectly legal */ 544 if (new_inode && S_ISDIR(new_inode->i_mode)) { 545 err = -EINVAL; 546 goto end1; 547 } 548 549 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 550 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed"); 551 err = -ENOENT; 552 goto end1; 553 } 554 copy_de(&de, dep); 555 de.hidden = new_name[0] == '.'; 556 557 if (new_inode) { 558 int r; 559 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) { 560 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) { 561 clear_nlink(new_inode); 562 copy_de(nde, &de); 563 memcpy(nde->name, new_name, new_len); 564 hpfs_mark_4buffers_dirty(&qbh1); 565 hpfs_brelse4(&qbh1); 566 goto end; 567 } 568 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent"); 569 err = -EFSERROR; 570 goto end1; 571 } 572 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0; 573 goto end1; 574 } 575 576 if (new_dir == old_dir) hpfs_brelse4(&qbh); 577 578 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) { 579 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!"); 580 err = r == 1 ? -ENOSPC : -EFSERROR; 581 if (new_dir != old_dir) hpfs_brelse4(&qbh); 582 goto end1; 583 } 584 585 if (new_dir == old_dir) 586 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 587 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2"); 588 err = -ENOENT; 589 goto end1; 590 } 591 592 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) { 593 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent"); 594 err = r == 2 ? -ENOSPC : -EFSERROR; 595 goto end1; 596 } 597 598 end: 599 hpfs_i(i)->i_parent_dir = new_dir->i_ino; 600 if (S_ISDIR(i->i_mode)) { 601 inc_nlink(new_dir); 602 drop_nlink(old_dir); 603 } 604 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) { 605 fnode->up = cpu_to_le32(new_dir->i_ino); 606 fnode->len = new_len; 607 memcpy(fnode->name, new_name, new_len>15?15:new_len); 608 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len); 609 mark_buffer_dirty(bh); 610 brelse(bh); 611 } 612 end1: 613 hpfs_unlock(i->i_sb); 614 return err; 615 } 616 617 const struct inode_operations hpfs_dir_iops = 618 { 619 .create = hpfs_create, 620 .lookup = hpfs_lookup, 621 .unlink = hpfs_unlink, 622 .symlink = hpfs_symlink, 623 .mkdir = hpfs_mkdir, 624 .rmdir = hpfs_rmdir, 625 .mknod = hpfs_mknod, 626 .rename = hpfs_rename, 627 .setattr = hpfs_setattr, 628 }; 629