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 11static 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 22static 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; 117bail3: 118 iput(result); 119bail2: 120 hpfs_brelse4(&qbh0); 121 hpfs_free_dnode(dir->i_sb, dno); 122bail1: 123 brelse(bh); 124 hpfs_free_sectors(dir->i_sb, fno, 1); 125bail: 126 hpfs_unlock(dir->i_sb); 127 return err; 128} 129 130static 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 207bail2: 208 iput(result); 209bail1: 210 brelse(bh); 211 hpfs_free_sectors(dir->i_sb, fno, 1); 212bail: 213 hpfs_unlock(dir->i_sb); 214 return err; 215} 216 217static 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 if (!new_valid_dev(rdev)) 231 return -EINVAL; 232 hpfs_lock(dir->i_sb); 233 err = -ENOSPC; 234 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 235 if (!fnode) 236 goto bail; 237 memset(&dee, 0, sizeof dee); 238 if (!(mode & 0222)) dee.read_only = 1; 239 dee.archive = 1; 240 dee.hidden = name[0] == '.'; 241 dee.fnode = cpu_to_le32(fno); 242 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 243 244 result = new_inode(dir->i_sb); 245 if (!result) 246 goto bail1; 247 248 hpfs_init_inode(result); 249 result->i_ino = fno; 250 hpfs_i(result)->i_parent_dir = dir->i_ino; 251 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)); 252 result->i_ctime.tv_nsec = 0; 253 result->i_mtime.tv_nsec = 0; 254 result->i_atime.tv_nsec = 0; 255 hpfs_i(result)->i_ea_size = 0; 256 result->i_uid = current_fsuid(); 257 result->i_gid = current_fsgid(); 258 set_nlink(result, 1); 259 result->i_size = 0; 260 result->i_blocks = 1; 261 init_special_inode(result, mode, rdev); 262 263 r = hpfs_add_dirent(dir, name, len, &dee); 264 if (r == 1) 265 goto bail2; 266 if (r == -1) { 267 err = -EEXIST; 268 goto bail2; 269 } 270 fnode->len = len; 271 memcpy(fnode->name, name, len > 15 ? 15 : len); 272 fnode->up = cpu_to_le32(dir->i_ino); 273 mark_buffer_dirty(bh); 274 275 insert_inode_hash(result); 276 277 hpfs_write_inode_nolock(result); 278 hpfs_update_directory_times(dir); 279 d_instantiate(dentry, result); 280 brelse(bh); 281 hpfs_unlock(dir->i_sb); 282 return 0; 283bail2: 284 iput(result); 285bail1: 286 brelse(bh); 287 hpfs_free_sectors(dir->i_sb, fno, 1); 288bail: 289 hpfs_unlock(dir->i_sb); 290 return err; 291} 292 293static int hpfs_symlink(struct inode *dir, struct dentry *dentry, const char *symlink) 294{ 295 const unsigned char *name = dentry->d_name.name; 296 unsigned len = dentry->d_name.len; 297 struct buffer_head *bh; 298 struct fnode *fnode; 299 fnode_secno fno; 300 int r; 301 struct hpfs_dirent dee; 302 struct inode *result; 303 int err; 304 if ((err = hpfs_chk_name(name, &len))) return err==-ENOENT ? -EINVAL : err; 305 hpfs_lock(dir->i_sb); 306 if (hpfs_sb(dir->i_sb)->sb_eas < 2) { 307 hpfs_unlock(dir->i_sb); 308 return -EPERM; 309 } 310 err = -ENOSPC; 311 fnode = hpfs_alloc_fnode(dir->i_sb, hpfs_i(dir)->i_dno, &fno, &bh); 312 if (!fnode) 313 goto bail; 314 memset(&dee, 0, sizeof dee); 315 dee.archive = 1; 316 dee.hidden = name[0] == '.'; 317 dee.fnode = cpu_to_le32(fno); 318 dee.creation_date = dee.write_date = dee.read_date = cpu_to_le32(gmt_to_local(dir->i_sb, get_seconds())); 319 320 result = new_inode(dir->i_sb); 321 if (!result) 322 goto bail1; 323 result->i_ino = fno; 324 hpfs_init_inode(result); 325 hpfs_i(result)->i_parent_dir = dir->i_ino; 326 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)); 327 result->i_ctime.tv_nsec = 0; 328 result->i_mtime.tv_nsec = 0; 329 result->i_atime.tv_nsec = 0; 330 hpfs_i(result)->i_ea_size = 0; 331 result->i_mode = S_IFLNK | 0777; 332 result->i_uid = current_fsuid(); 333 result->i_gid = current_fsgid(); 334 result->i_blocks = 1; 335 set_nlink(result, 1); 336 result->i_size = strlen(symlink); 337 result->i_op = &page_symlink_inode_operations; 338 result->i_data.a_ops = &hpfs_symlink_aops; 339 340 r = hpfs_add_dirent(dir, name, len, &dee); 341 if (r == 1) 342 goto bail2; 343 if (r == -1) { 344 err = -EEXIST; 345 goto bail2; 346 } 347 fnode->len = len; 348 memcpy(fnode->name, name, len > 15 ? 15 : len); 349 fnode->up = cpu_to_le32(dir->i_ino); 350 hpfs_set_ea(result, fnode, "SYMLINK", symlink, strlen(symlink)); 351 mark_buffer_dirty(bh); 352 brelse(bh); 353 354 insert_inode_hash(result); 355 356 hpfs_write_inode_nolock(result); 357 hpfs_update_directory_times(dir); 358 d_instantiate(dentry, result); 359 hpfs_unlock(dir->i_sb); 360 return 0; 361bail2: 362 iput(result); 363bail1: 364 brelse(bh); 365 hpfs_free_sectors(dir->i_sb, fno, 1); 366bail: 367 hpfs_unlock(dir->i_sb); 368 return err; 369} 370 371static int hpfs_unlink(struct inode *dir, struct dentry *dentry) 372{ 373 const unsigned char *name = dentry->d_name.name; 374 unsigned len = dentry->d_name.len; 375 struct quad_buffer_head qbh; 376 struct hpfs_dirent *de; 377 struct inode *inode = d_inode(dentry); 378 dnode_secno dno; 379 int r; 380 int err; 381 382 hpfs_lock(dir->i_sb); 383 hpfs_adjust_length(name, &len); 384 385 err = -ENOENT; 386 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 387 if (!de) 388 goto out; 389 390 err = -EPERM; 391 if (de->first) 392 goto out1; 393 394 err = -EISDIR; 395 if (de->directory) 396 goto out1; 397 398 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 399 switch (r) { 400 case 1: 401 hpfs_error(dir->i_sb, "there was error when removing dirent"); 402 err = -EFSERROR; 403 break; 404 case 2: /* no space for deleting */ 405 err = -ENOSPC; 406 break; 407 default: 408 drop_nlink(inode); 409 err = 0; 410 } 411 goto out; 412 413out1: 414 hpfs_brelse4(&qbh); 415out: 416 if (!err) 417 hpfs_update_directory_times(dir); 418 hpfs_unlock(dir->i_sb); 419 return err; 420} 421 422static int hpfs_rmdir(struct inode *dir, struct dentry *dentry) 423{ 424 const unsigned char *name = dentry->d_name.name; 425 unsigned len = dentry->d_name.len; 426 struct quad_buffer_head qbh; 427 struct hpfs_dirent *de; 428 struct inode *inode = d_inode(dentry); 429 dnode_secno dno; 430 int n_items = 0; 431 int err; 432 int r; 433 434 hpfs_adjust_length(name, &len); 435 hpfs_lock(dir->i_sb); 436 err = -ENOENT; 437 de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, &dno, &qbh); 438 if (!de) 439 goto out; 440 441 err = -EPERM; 442 if (de->first) 443 goto out1; 444 445 err = -ENOTDIR; 446 if (!de->directory) 447 goto out1; 448 449 hpfs_count_dnodes(dir->i_sb, hpfs_i(inode)->i_dno, NULL, NULL, &n_items); 450 err = -ENOTEMPTY; 451 if (n_items) 452 goto out1; 453 454 r = hpfs_remove_dirent(dir, dno, de, &qbh, 1); 455 switch (r) { 456 case 1: 457 hpfs_error(dir->i_sb, "there was error when removing dirent"); 458 err = -EFSERROR; 459 break; 460 case 2: 461 err = -ENOSPC; 462 break; 463 default: 464 drop_nlink(dir); 465 clear_nlink(inode); 466 err = 0; 467 } 468 goto out; 469out1: 470 hpfs_brelse4(&qbh); 471out: 472 if (!err) 473 hpfs_update_directory_times(dir); 474 hpfs_unlock(dir->i_sb); 475 return err; 476} 477 478static int hpfs_symlink_readpage(struct file *file, struct page *page) 479{ 480 char *link = kmap(page); 481 struct inode *i = page->mapping->host; 482 struct fnode *fnode; 483 struct buffer_head *bh; 484 int err; 485 486 err = -EIO; 487 hpfs_lock(i->i_sb); 488 if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) 489 goto fail; 490 err = hpfs_read_ea(i->i_sb, fnode, "SYMLINK", link, PAGE_SIZE); 491 brelse(bh); 492 if (err) 493 goto fail; 494 hpfs_unlock(i->i_sb); 495 SetPageUptodate(page); 496 kunmap(page); 497 unlock_page(page); 498 return 0; 499 500fail: 501 hpfs_unlock(i->i_sb); 502 SetPageError(page); 503 kunmap(page); 504 unlock_page(page); 505 return err; 506} 507 508const struct address_space_operations hpfs_symlink_aops = { 509 .readpage = hpfs_symlink_readpage 510}; 511 512static int hpfs_rename(struct inode *old_dir, struct dentry *old_dentry, 513 struct inode *new_dir, struct dentry *new_dentry) 514{ 515 const unsigned char *old_name = old_dentry->d_name.name; 516 unsigned old_len = old_dentry->d_name.len; 517 const unsigned char *new_name = new_dentry->d_name.name; 518 unsigned new_len = new_dentry->d_name.len; 519 struct inode *i = d_inode(old_dentry); 520 struct inode *new_inode = d_inode(new_dentry); 521 struct quad_buffer_head qbh, qbh1; 522 struct hpfs_dirent *dep, *nde; 523 struct hpfs_dirent de; 524 dnode_secno dno; 525 int r; 526 struct buffer_head *bh; 527 struct fnode *fnode; 528 int err; 529 530 if ((err = hpfs_chk_name(new_name, &new_len))) return err; 531 err = 0; 532 hpfs_adjust_length(old_name, &old_len); 533 534 hpfs_lock(i->i_sb); 535 /* order doesn't matter, due to VFS exclusion */ 536 537 /* Erm? Moving over the empty non-busy directory is perfectly legal */ 538 if (new_inode && S_ISDIR(new_inode->i_mode)) { 539 err = -EINVAL; 540 goto end1; 541 } 542 543 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 544 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed"); 545 err = -ENOENT; 546 goto end1; 547 } 548 copy_de(&de, dep); 549 de.hidden = new_name[0] == '.'; 550 551 if (new_inode) { 552 int r; 553 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 1)) != 2) { 554 if ((nde = map_dirent(new_dir, hpfs_i(new_dir)->i_dno, new_name, new_len, NULL, &qbh1))) { 555 clear_nlink(new_inode); 556 copy_de(nde, &de); 557 memcpy(nde->name, new_name, new_len); 558 hpfs_mark_4buffers_dirty(&qbh1); 559 hpfs_brelse4(&qbh1); 560 goto end; 561 } 562 hpfs_error(new_dir->i_sb, "hpfs_rename: could not find dirent"); 563 err = -EFSERROR; 564 goto end1; 565 } 566 err = r == 2 ? -ENOSPC : r == 1 ? -EFSERROR : 0; 567 goto end1; 568 } 569 570 if (new_dir == old_dir) hpfs_brelse4(&qbh); 571 572 if ((r = hpfs_add_dirent(new_dir, new_name, new_len, &de))) { 573 if (r == -1) hpfs_error(new_dir->i_sb, "hpfs_rename: dirent already exists!"); 574 err = r == 1 ? -ENOSPC : -EFSERROR; 575 if (new_dir != old_dir) hpfs_brelse4(&qbh); 576 goto end1; 577 } 578 579 if (new_dir == old_dir) 580 if (!(dep = map_dirent(old_dir, hpfs_i(old_dir)->i_dno, old_name, old_len, &dno, &qbh))) { 581 hpfs_error(i->i_sb, "lookup succeeded but map dirent failed at #2"); 582 err = -ENOENT; 583 goto end1; 584 } 585 586 if ((r = hpfs_remove_dirent(old_dir, dno, dep, &qbh, 0))) { 587 hpfs_error(i->i_sb, "hpfs_rename: could not remove dirent"); 588 err = r == 2 ? -ENOSPC : -EFSERROR; 589 goto end1; 590 } 591 592end: 593 hpfs_i(i)->i_parent_dir = new_dir->i_ino; 594 if (S_ISDIR(i->i_mode)) { 595 inc_nlink(new_dir); 596 drop_nlink(old_dir); 597 } 598 if ((fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) { 599 fnode->up = cpu_to_le32(new_dir->i_ino); 600 fnode->len = new_len; 601 memcpy(fnode->name, new_name, new_len>15?15:new_len); 602 if (new_len < 15) memset(&fnode->name[new_len], 0, 15 - new_len); 603 mark_buffer_dirty(bh); 604 brelse(bh); 605 } 606end1: 607 if (!err) { 608 hpfs_update_directory_times(old_dir); 609 hpfs_update_directory_times(new_dir); 610 } 611 hpfs_unlock(i->i_sb); 612 return err; 613} 614 615const struct inode_operations hpfs_dir_iops = 616{ 617 .create = hpfs_create, 618 .lookup = hpfs_lookup, 619 .unlink = hpfs_unlink, 620 .symlink = hpfs_symlink, 621 .mkdir = hpfs_mkdir, 622 .rmdir = hpfs_rmdir, 623 .mknod = hpfs_mknod, 624 .rename = hpfs_rename, 625 .setattr = hpfs_setattr, 626}; 627