1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * 6 * Created by David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/fs.h> 15 #include <linux/crc32.h> 16 #include <linux/jffs2.h> 17 #include "jffs2_fs_i.h" 18 #include "jffs2_fs_sb.h" 19 #include <linux/time.h> 20 #include "nodelist.h" 21 22 static int jffs2_readdir (struct file *, void *, filldir_t); 23 24 static int jffs2_create (struct inode *,struct dentry *,int, 25 struct nameidata *); 26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 27 struct nameidata *); 28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 29 static int jffs2_unlink (struct inode *,struct dentry *); 30 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 31 static int jffs2_mkdir (struct inode *,struct dentry *,int); 32 static int jffs2_rmdir (struct inode *,struct dentry *); 33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 34 static int jffs2_rename (struct inode *, struct dentry *, 35 struct inode *, struct dentry *); 36 37 const struct file_operations jffs2_dir_operations = 38 { 39 .read = generic_read_dir, 40 .readdir = jffs2_readdir, 41 .ioctl = jffs2_ioctl, 42 .fsync = jffs2_fsync 43 }; 44 45 46 const struct inode_operations jffs2_dir_inode_operations = 47 { 48 .create = jffs2_create, 49 .lookup = jffs2_lookup, 50 .link = jffs2_link, 51 .unlink = jffs2_unlink, 52 .symlink = jffs2_symlink, 53 .mkdir = jffs2_mkdir, 54 .rmdir = jffs2_rmdir, 55 .mknod = jffs2_mknod, 56 .rename = jffs2_rename, 57 .permission = jffs2_permission, 58 .setattr = jffs2_setattr, 59 .setxattr = jffs2_setxattr, 60 .getxattr = jffs2_getxattr, 61 .listxattr = jffs2_listxattr, 62 .removexattr = jffs2_removexattr 63 }; 64 65 /***********************************************************************/ 66 67 68 /* We keep the dirent list sorted in increasing order of name hash, 69 and we use the same hash function as the dentries. Makes this 70 nice and simple 71 */ 72 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 73 struct nameidata *nd) 74 { 75 struct jffs2_inode_info *dir_f; 76 struct jffs2_sb_info *c; 77 struct jffs2_full_dirent *fd = NULL, *fd_list; 78 uint32_t ino = 0; 79 struct inode *inode = NULL; 80 81 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 82 83 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 84 return ERR_PTR(-ENAMETOOLONG); 85 86 dir_f = JFFS2_INODE_INFO(dir_i); 87 c = JFFS2_SB_INFO(dir_i->i_sb); 88 89 down(&dir_f->sem); 90 91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 93 if (fd_list->nhash == target->d_name.hash && 94 (!fd || fd_list->version > fd->version) && 95 strlen(fd_list->name) == target->d_name.len && 96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 97 fd = fd_list; 98 } 99 } 100 if (fd) 101 ino = fd->ino; 102 up(&dir_f->sem); 103 if (ino) { 104 inode = iget(dir_i->i_sb, ino); 105 if (!inode) { 106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 107 return (ERR_PTR(-EIO)); 108 } 109 } 110 111 d_add(target, inode); 112 113 return NULL; 114 } 115 116 /***********************************************************************/ 117 118 119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 120 { 121 struct jffs2_inode_info *f; 122 struct jffs2_sb_info *c; 123 struct inode *inode = filp->f_path.dentry->d_inode; 124 struct jffs2_full_dirent *fd; 125 unsigned long offset, curofs; 126 127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 128 129 f = JFFS2_INODE_INFO(inode); 130 c = JFFS2_SB_INFO(inode->i_sb); 131 132 offset = filp->f_pos; 133 134 if (offset == 0) { 135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 137 goto out; 138 offset++; 139 } 140 if (offset == 1) { 141 unsigned long pino = parent_ino(filp->f_path.dentry); 142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 144 goto out; 145 offset++; 146 } 147 148 curofs=1; 149 down(&f->sem); 150 for (fd = f->dents; fd; fd = fd->next) { 151 152 curofs++; 153 /* First loop: curofs = 2; offset = 2 */ 154 if (curofs < offset) { 155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 156 fd->name, fd->ino, fd->type, curofs, offset)); 157 continue; 158 } 159 if (!fd->ino) { 160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 161 offset++; 162 continue; 163 } 164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 166 break; 167 offset++; 168 } 169 up(&f->sem); 170 out: 171 filp->f_pos = offset; 172 return 0; 173 } 174 175 /***********************************************************************/ 176 177 178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 179 struct nameidata *nd) 180 { 181 struct jffs2_raw_inode *ri; 182 struct jffs2_inode_info *f, *dir_f; 183 struct jffs2_sb_info *c; 184 struct inode *inode; 185 int ret; 186 187 ri = jffs2_alloc_raw_inode(); 188 if (!ri) 189 return -ENOMEM; 190 191 c = JFFS2_SB_INFO(dir_i->i_sb); 192 193 D1(printk(KERN_DEBUG "jffs2_create()\n")); 194 195 inode = jffs2_new_inode(dir_i, mode, ri); 196 197 if (IS_ERR(inode)) { 198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 199 jffs2_free_raw_inode(ri); 200 return PTR_ERR(inode); 201 } 202 203 inode->i_op = &jffs2_file_inode_operations; 204 inode->i_fop = &jffs2_file_operations; 205 inode->i_mapping->a_ops = &jffs2_file_address_operations; 206 inode->i_mapping->nrpages = 0; 207 208 f = JFFS2_INODE_INFO(inode); 209 dir_f = JFFS2_INODE_INFO(dir_i); 210 211 ret = jffs2_do_create(c, dir_f, f, ri, 212 dentry->d_name.name, dentry->d_name.len); 213 214 if (ret) 215 goto fail; 216 217 ret = jffs2_init_security(inode, dir_i); 218 if (ret) 219 goto fail; 220 ret = jffs2_init_acl(inode, dir_i); 221 if (ret) 222 goto fail; 223 224 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 225 226 jffs2_free_raw_inode(ri); 227 d_instantiate(dentry, inode); 228 229 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 230 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 231 return 0; 232 233 fail: 234 make_bad_inode(inode); 235 iput(inode); 236 jffs2_free_raw_inode(ri); 237 return ret; 238 } 239 240 /***********************************************************************/ 241 242 243 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 244 { 245 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 247 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 248 int ret; 249 uint32_t now = get_seconds(); 250 251 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 252 dentry->d_name.len, dead_f, now); 253 if (dead_f->inocache) 254 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 255 if (!ret) 256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 257 return ret; 258 } 259 /***********************************************************************/ 260 261 262 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 263 { 264 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 265 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 266 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 267 int ret; 268 uint8_t type; 269 uint32_t now; 270 271 /* Don't let people make hard links to bad inodes. */ 272 if (!f->inocache) 273 return -EIO; 274 275 if (S_ISDIR(old_dentry->d_inode->i_mode)) 276 return -EPERM; 277 278 /* XXX: This is ugly */ 279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 280 if (!type) type = DT_REG; 281 282 now = get_seconds(); 283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 284 285 if (!ret) { 286 down(&f->sem); 287 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 288 up(&f->sem); 289 d_instantiate(dentry, old_dentry->d_inode); 290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 291 atomic_inc(&old_dentry->d_inode->i_count); 292 } 293 return ret; 294 } 295 296 /***********************************************************************/ 297 298 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 299 { 300 struct jffs2_inode_info *f, *dir_f; 301 struct jffs2_sb_info *c; 302 struct inode *inode; 303 struct jffs2_raw_inode *ri; 304 struct jffs2_raw_dirent *rd; 305 struct jffs2_full_dnode *fn; 306 struct jffs2_full_dirent *fd; 307 int namelen; 308 uint32_t alloclen; 309 int ret, targetlen = strlen(target); 310 311 /* FIXME: If you care. We'd need to use frags for the target 312 if it grows much more than this */ 313 if (targetlen > 254) 314 return -EINVAL; 315 316 ri = jffs2_alloc_raw_inode(); 317 318 if (!ri) 319 return -ENOMEM; 320 321 c = JFFS2_SB_INFO(dir_i->i_sb); 322 323 /* Try to reserve enough space for both node and dirent. 324 * Just the node will do for now, though 325 */ 326 namelen = dentry->d_name.len; 327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 329 330 if (ret) { 331 jffs2_free_raw_inode(ri); 332 return ret; 333 } 334 335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 336 337 if (IS_ERR(inode)) { 338 jffs2_free_raw_inode(ri); 339 jffs2_complete_reservation(c); 340 return PTR_ERR(inode); 341 } 342 343 inode->i_op = &jffs2_symlink_inode_operations; 344 345 f = JFFS2_INODE_INFO(inode); 346 347 inode->i_size = targetlen; 348 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 349 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 350 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 351 352 ri->compr = JFFS2_COMPR_NONE; 353 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 354 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 355 356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 357 358 jffs2_free_raw_inode(ri); 359 360 if (IS_ERR(fn)) { 361 /* Eeek. Wave bye bye */ 362 up(&f->sem); 363 jffs2_complete_reservation(c); 364 jffs2_clear_inode(inode); 365 return PTR_ERR(fn); 366 } 367 368 /* We use f->target field to store the target path. */ 369 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 370 if (!f->target) { 371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 372 up(&f->sem); 373 jffs2_complete_reservation(c); 374 jffs2_clear_inode(inode); 375 return -ENOMEM; 376 } 377 378 memcpy(f->target, target, targetlen + 1); 379 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 380 381 /* No data here. Only a metadata node, which will be 382 obsoleted by the first data write 383 */ 384 f->metadata = fn; 385 up(&f->sem); 386 387 jffs2_complete_reservation(c); 388 389 ret = jffs2_init_security(inode, dir_i); 390 if (ret) { 391 jffs2_clear_inode(inode); 392 return ret; 393 } 394 ret = jffs2_init_acl(inode, dir_i); 395 if (ret) { 396 jffs2_clear_inode(inode); 397 return ret; 398 } 399 400 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 401 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 402 if (ret) { 403 /* Eep. */ 404 jffs2_clear_inode(inode); 405 return ret; 406 } 407 408 rd = jffs2_alloc_raw_dirent(); 409 if (!rd) { 410 /* Argh. Now we treat it like a normal delete */ 411 jffs2_complete_reservation(c); 412 jffs2_clear_inode(inode); 413 return -ENOMEM; 414 } 415 416 dir_f = JFFS2_INODE_INFO(dir_i); 417 down(&dir_f->sem); 418 419 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 420 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 421 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 422 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 423 424 rd->pino = cpu_to_je32(dir_i->i_ino); 425 rd->version = cpu_to_je32(++dir_f->highest_version); 426 rd->ino = cpu_to_je32(inode->i_ino); 427 rd->mctime = cpu_to_je32(get_seconds()); 428 rd->nsize = namelen; 429 rd->type = DT_LNK; 430 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 431 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 432 433 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 434 435 if (IS_ERR(fd)) { 436 /* dirent failed to write. Delete the inode normally 437 as if it were the final unlink() */ 438 jffs2_complete_reservation(c); 439 jffs2_free_raw_dirent(rd); 440 up(&dir_f->sem); 441 jffs2_clear_inode(inode); 442 return PTR_ERR(fd); 443 } 444 445 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 446 447 jffs2_free_raw_dirent(rd); 448 449 /* Link the fd into the inode's list, obsoleting an old 450 one if necessary. */ 451 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 452 453 up(&dir_f->sem); 454 jffs2_complete_reservation(c); 455 456 d_instantiate(dentry, inode); 457 return 0; 458 } 459 460 461 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 462 { 463 struct jffs2_inode_info *f, *dir_f; 464 struct jffs2_sb_info *c; 465 struct inode *inode; 466 struct jffs2_raw_inode *ri; 467 struct jffs2_raw_dirent *rd; 468 struct jffs2_full_dnode *fn; 469 struct jffs2_full_dirent *fd; 470 int namelen; 471 uint32_t alloclen; 472 int ret; 473 474 mode |= S_IFDIR; 475 476 ri = jffs2_alloc_raw_inode(); 477 if (!ri) 478 return -ENOMEM; 479 480 c = JFFS2_SB_INFO(dir_i->i_sb); 481 482 /* Try to reserve enough space for both node and dirent. 483 * Just the node will do for now, though 484 */ 485 namelen = dentry->d_name.len; 486 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 487 JFFS2_SUMMARY_INODE_SIZE); 488 489 if (ret) { 490 jffs2_free_raw_inode(ri); 491 return ret; 492 } 493 494 inode = jffs2_new_inode(dir_i, mode, ri); 495 496 if (IS_ERR(inode)) { 497 jffs2_free_raw_inode(ri); 498 jffs2_complete_reservation(c); 499 return PTR_ERR(inode); 500 } 501 502 inode->i_op = &jffs2_dir_inode_operations; 503 inode->i_fop = &jffs2_dir_operations; 504 /* Directories get nlink 2 at start */ 505 inode->i_nlink = 2; 506 507 f = JFFS2_INODE_INFO(inode); 508 509 ri->data_crc = cpu_to_je32(0); 510 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 511 512 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 513 514 jffs2_free_raw_inode(ri); 515 516 if (IS_ERR(fn)) { 517 /* Eeek. Wave bye bye */ 518 up(&f->sem); 519 jffs2_complete_reservation(c); 520 jffs2_clear_inode(inode); 521 return PTR_ERR(fn); 522 } 523 /* No data here. Only a metadata node, which will be 524 obsoleted by the first data write 525 */ 526 f->metadata = fn; 527 up(&f->sem); 528 529 jffs2_complete_reservation(c); 530 531 ret = jffs2_init_security(inode, dir_i); 532 if (ret) { 533 jffs2_clear_inode(inode); 534 return ret; 535 } 536 ret = jffs2_init_acl(inode, dir_i); 537 if (ret) { 538 jffs2_clear_inode(inode); 539 return ret; 540 } 541 542 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 543 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 544 if (ret) { 545 /* Eep. */ 546 jffs2_clear_inode(inode); 547 return ret; 548 } 549 550 rd = jffs2_alloc_raw_dirent(); 551 if (!rd) { 552 /* Argh. Now we treat it like a normal delete */ 553 jffs2_complete_reservation(c); 554 jffs2_clear_inode(inode); 555 return -ENOMEM; 556 } 557 558 dir_f = JFFS2_INODE_INFO(dir_i); 559 down(&dir_f->sem); 560 561 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 562 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 563 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 564 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 565 566 rd->pino = cpu_to_je32(dir_i->i_ino); 567 rd->version = cpu_to_je32(++dir_f->highest_version); 568 rd->ino = cpu_to_je32(inode->i_ino); 569 rd->mctime = cpu_to_je32(get_seconds()); 570 rd->nsize = namelen; 571 rd->type = DT_DIR; 572 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 573 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 574 575 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 576 577 if (IS_ERR(fd)) { 578 /* dirent failed to write. Delete the inode normally 579 as if it were the final unlink() */ 580 jffs2_complete_reservation(c); 581 jffs2_free_raw_dirent(rd); 582 up(&dir_f->sem); 583 jffs2_clear_inode(inode); 584 return PTR_ERR(fd); 585 } 586 587 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 588 inc_nlink(dir_i); 589 590 jffs2_free_raw_dirent(rd); 591 592 /* Link the fd into the inode's list, obsoleting an old 593 one if necessary. */ 594 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 595 596 up(&dir_f->sem); 597 jffs2_complete_reservation(c); 598 599 d_instantiate(dentry, inode); 600 return 0; 601 } 602 603 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 604 { 605 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 606 struct jffs2_full_dirent *fd; 607 int ret; 608 609 for (fd = f->dents ; fd; fd = fd->next) { 610 if (fd->ino) 611 return -ENOTEMPTY; 612 } 613 ret = jffs2_unlink(dir_i, dentry); 614 if (!ret) 615 drop_nlink(dir_i); 616 return ret; 617 } 618 619 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 620 { 621 struct jffs2_inode_info *f, *dir_f; 622 struct jffs2_sb_info *c; 623 struct inode *inode; 624 struct jffs2_raw_inode *ri; 625 struct jffs2_raw_dirent *rd; 626 struct jffs2_full_dnode *fn; 627 struct jffs2_full_dirent *fd; 628 int namelen; 629 union jffs2_device_node dev; 630 int devlen = 0; 631 uint32_t alloclen; 632 int ret; 633 634 if (!new_valid_dev(rdev)) 635 return -EINVAL; 636 637 ri = jffs2_alloc_raw_inode(); 638 if (!ri) 639 return -ENOMEM; 640 641 c = JFFS2_SB_INFO(dir_i->i_sb); 642 643 if (S_ISBLK(mode) || S_ISCHR(mode)) 644 devlen = jffs2_encode_dev(&dev, rdev); 645 646 /* Try to reserve enough space for both node and dirent. 647 * Just the node will do for now, though 648 */ 649 namelen = dentry->d_name.len; 650 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 651 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 652 653 if (ret) { 654 jffs2_free_raw_inode(ri); 655 return ret; 656 } 657 658 inode = jffs2_new_inode(dir_i, mode, ri); 659 660 if (IS_ERR(inode)) { 661 jffs2_free_raw_inode(ri); 662 jffs2_complete_reservation(c); 663 return PTR_ERR(inode); 664 } 665 inode->i_op = &jffs2_file_inode_operations; 666 init_special_inode(inode, inode->i_mode, rdev); 667 668 f = JFFS2_INODE_INFO(inode); 669 670 ri->dsize = ri->csize = cpu_to_je32(devlen); 671 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 672 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 673 674 ri->compr = JFFS2_COMPR_NONE; 675 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 676 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 677 678 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 679 680 jffs2_free_raw_inode(ri); 681 682 if (IS_ERR(fn)) { 683 /* Eeek. Wave bye bye */ 684 up(&f->sem); 685 jffs2_complete_reservation(c); 686 jffs2_clear_inode(inode); 687 return PTR_ERR(fn); 688 } 689 /* No data here. Only a metadata node, which will be 690 obsoleted by the first data write 691 */ 692 f->metadata = fn; 693 up(&f->sem); 694 695 jffs2_complete_reservation(c); 696 697 ret = jffs2_init_security(inode, dir_i); 698 if (ret) { 699 jffs2_clear_inode(inode); 700 return ret; 701 } 702 ret = jffs2_init_acl(inode, dir_i); 703 if (ret) { 704 jffs2_clear_inode(inode); 705 return ret; 706 } 707 708 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 709 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 710 if (ret) { 711 /* Eep. */ 712 jffs2_clear_inode(inode); 713 return ret; 714 } 715 716 rd = jffs2_alloc_raw_dirent(); 717 if (!rd) { 718 /* Argh. Now we treat it like a normal delete */ 719 jffs2_complete_reservation(c); 720 jffs2_clear_inode(inode); 721 return -ENOMEM; 722 } 723 724 dir_f = JFFS2_INODE_INFO(dir_i); 725 down(&dir_f->sem); 726 727 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 728 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 729 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 730 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 731 732 rd->pino = cpu_to_je32(dir_i->i_ino); 733 rd->version = cpu_to_je32(++dir_f->highest_version); 734 rd->ino = cpu_to_je32(inode->i_ino); 735 rd->mctime = cpu_to_je32(get_seconds()); 736 rd->nsize = namelen; 737 738 /* XXX: This is ugly. */ 739 rd->type = (mode & S_IFMT) >> 12; 740 741 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 742 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 743 744 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 745 746 if (IS_ERR(fd)) { 747 /* dirent failed to write. Delete the inode normally 748 as if it were the final unlink() */ 749 jffs2_complete_reservation(c); 750 jffs2_free_raw_dirent(rd); 751 up(&dir_f->sem); 752 jffs2_clear_inode(inode); 753 return PTR_ERR(fd); 754 } 755 756 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 757 758 jffs2_free_raw_dirent(rd); 759 760 /* Link the fd into the inode's list, obsoleting an old 761 one if necessary. */ 762 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 763 764 up(&dir_f->sem); 765 jffs2_complete_reservation(c); 766 767 d_instantiate(dentry, inode); 768 769 return 0; 770 } 771 772 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 773 struct inode *new_dir_i, struct dentry *new_dentry) 774 { 775 int ret; 776 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 777 struct jffs2_inode_info *victim_f = NULL; 778 uint8_t type; 779 uint32_t now; 780 781 /* The VFS will check for us and prevent trying to rename a 782 * file over a directory and vice versa, but if it's a directory, 783 * the VFS can't check whether the victim is empty. The filesystem 784 * needs to do that for itself. 785 */ 786 if (new_dentry->d_inode) { 787 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 788 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 789 struct jffs2_full_dirent *fd; 790 791 down(&victim_f->sem); 792 for (fd = victim_f->dents; fd; fd = fd->next) { 793 if (fd->ino) { 794 up(&victim_f->sem); 795 return -ENOTEMPTY; 796 } 797 } 798 up(&victim_f->sem); 799 } 800 } 801 802 /* XXX: We probably ought to alloc enough space for 803 both nodes at the same time. Writing the new link, 804 then getting -ENOSPC, is quite bad :) 805 */ 806 807 /* Make a hard link */ 808 809 /* XXX: This is ugly */ 810 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 811 if (!type) type = DT_REG; 812 813 now = get_seconds(); 814 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 815 old_dentry->d_inode->i_ino, type, 816 new_dentry->d_name.name, new_dentry->d_name.len, now); 817 818 if (ret) 819 return ret; 820 821 if (victim_f) { 822 /* There was a victim. Kill it off nicely */ 823 drop_nlink(new_dentry->d_inode); 824 /* Don't oops if the victim was a dirent pointing to an 825 inode which didn't exist. */ 826 if (victim_f->inocache) { 827 down(&victim_f->sem); 828 victim_f->inocache->nlink--; 829 up(&victim_f->sem); 830 } 831 } 832 833 /* If it was a directory we moved, and there was no victim, 834 increase i_nlink on its new parent */ 835 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 836 inc_nlink(new_dir_i); 837 838 /* Unlink the original */ 839 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 840 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 841 842 /* We don't touch inode->i_nlink */ 843 844 if (ret) { 845 /* Oh shit. We really ought to make a single node which can do both atomically */ 846 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 847 down(&f->sem); 848 inc_nlink(old_dentry->d_inode); 849 if (f->inocache) 850 f->inocache->nlink++; 851 up(&f->sem); 852 853 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 854 /* Might as well let the VFS know */ 855 d_instantiate(new_dentry, old_dentry->d_inode); 856 atomic_inc(&old_dentry->d_inode->i_count); 857 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 858 return ret; 859 } 860 861 if (S_ISDIR(old_dentry->d_inode->i_mode)) 862 drop_nlink(old_dir_i); 863 864 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 865 866 return 0; 867 } 868 869