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 if (ret) 214 goto fail; 215 216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 217 218 jffs2_free_raw_inode(ri); 219 d_instantiate(dentry, inode); 220 221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 223 return 0; 224 225 fail: 226 make_bad_inode(inode); 227 iput(inode); 228 jffs2_free_raw_inode(ri); 229 return ret; 230 } 231 232 /***********************************************************************/ 233 234 235 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 236 { 237 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 238 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 239 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 240 int ret; 241 uint32_t now = get_seconds(); 242 243 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 244 dentry->d_name.len, dead_f, now); 245 if (dead_f->inocache) 246 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 247 if (!ret) 248 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 249 return ret; 250 } 251 /***********************************************************************/ 252 253 254 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 255 { 256 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 257 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 258 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 259 int ret; 260 uint8_t type; 261 uint32_t now; 262 263 /* Don't let people make hard links to bad inodes. */ 264 if (!f->inocache) 265 return -EIO; 266 267 if (S_ISDIR(old_dentry->d_inode->i_mode)) 268 return -EPERM; 269 270 /* XXX: This is ugly */ 271 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 272 if (!type) type = DT_REG; 273 274 now = get_seconds(); 275 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 276 277 if (!ret) { 278 down(&f->sem); 279 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 280 up(&f->sem); 281 d_instantiate(dentry, old_dentry->d_inode); 282 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 283 atomic_inc(&old_dentry->d_inode->i_count); 284 } 285 return ret; 286 } 287 288 /***********************************************************************/ 289 290 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 291 { 292 struct jffs2_inode_info *f, *dir_f; 293 struct jffs2_sb_info *c; 294 struct inode *inode; 295 struct jffs2_raw_inode *ri; 296 struct jffs2_raw_dirent *rd; 297 struct jffs2_full_dnode *fn; 298 struct jffs2_full_dirent *fd; 299 int namelen; 300 uint32_t alloclen; 301 int ret, targetlen = strlen(target); 302 303 /* FIXME: If you care. We'd need to use frags for the target 304 if it grows much more than this */ 305 if (targetlen > 254) 306 return -EINVAL; 307 308 ri = jffs2_alloc_raw_inode(); 309 310 if (!ri) 311 return -ENOMEM; 312 313 c = JFFS2_SB_INFO(dir_i->i_sb); 314 315 /* Try to reserve enough space for both node and dirent. 316 * Just the node will do for now, though 317 */ 318 namelen = dentry->d_name.len; 319 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 320 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 321 322 if (ret) { 323 jffs2_free_raw_inode(ri); 324 return ret; 325 } 326 327 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 328 329 if (IS_ERR(inode)) { 330 jffs2_free_raw_inode(ri); 331 jffs2_complete_reservation(c); 332 return PTR_ERR(inode); 333 } 334 335 inode->i_op = &jffs2_symlink_inode_operations; 336 337 f = JFFS2_INODE_INFO(inode); 338 339 inode->i_size = targetlen; 340 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 341 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 342 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 343 344 ri->compr = JFFS2_COMPR_NONE; 345 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 346 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 347 348 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 349 350 jffs2_free_raw_inode(ri); 351 352 if (IS_ERR(fn)) { 353 /* Eeek. Wave bye bye */ 354 up(&f->sem); 355 jffs2_complete_reservation(c); 356 jffs2_clear_inode(inode); 357 return PTR_ERR(fn); 358 } 359 360 /* We use f->target field to store the target path. */ 361 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 362 if (!f->target) { 363 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 364 up(&f->sem); 365 jffs2_complete_reservation(c); 366 jffs2_clear_inode(inode); 367 return -ENOMEM; 368 } 369 370 memcpy(f->target, target, targetlen + 1); 371 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 372 373 /* No data here. Only a metadata node, which will be 374 obsoleted by the first data write 375 */ 376 f->metadata = fn; 377 up(&f->sem); 378 379 jffs2_complete_reservation(c); 380 381 ret = jffs2_init_security(inode, dir_i); 382 if (ret) { 383 jffs2_clear_inode(inode); 384 return ret; 385 } 386 ret = jffs2_init_acl_post(inode); 387 if (ret) { 388 jffs2_clear_inode(inode); 389 return ret; 390 } 391 392 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 393 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 394 if (ret) { 395 /* Eep. */ 396 jffs2_clear_inode(inode); 397 return ret; 398 } 399 400 rd = jffs2_alloc_raw_dirent(); 401 if (!rd) { 402 /* Argh. Now we treat it like a normal delete */ 403 jffs2_complete_reservation(c); 404 jffs2_clear_inode(inode); 405 return -ENOMEM; 406 } 407 408 dir_f = JFFS2_INODE_INFO(dir_i); 409 down(&dir_f->sem); 410 411 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 412 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 413 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 414 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 415 416 rd->pino = cpu_to_je32(dir_i->i_ino); 417 rd->version = cpu_to_je32(++dir_f->highest_version); 418 rd->ino = cpu_to_je32(inode->i_ino); 419 rd->mctime = cpu_to_je32(get_seconds()); 420 rd->nsize = namelen; 421 rd->type = DT_LNK; 422 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 423 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 424 425 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 426 427 if (IS_ERR(fd)) { 428 /* dirent failed to write. Delete the inode normally 429 as if it were the final unlink() */ 430 jffs2_complete_reservation(c); 431 jffs2_free_raw_dirent(rd); 432 up(&dir_f->sem); 433 jffs2_clear_inode(inode); 434 return PTR_ERR(fd); 435 } 436 437 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 438 439 jffs2_free_raw_dirent(rd); 440 441 /* Link the fd into the inode's list, obsoleting an old 442 one if necessary. */ 443 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 444 445 up(&dir_f->sem); 446 jffs2_complete_reservation(c); 447 448 d_instantiate(dentry, inode); 449 return 0; 450 } 451 452 453 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 454 { 455 struct jffs2_inode_info *f, *dir_f; 456 struct jffs2_sb_info *c; 457 struct inode *inode; 458 struct jffs2_raw_inode *ri; 459 struct jffs2_raw_dirent *rd; 460 struct jffs2_full_dnode *fn; 461 struct jffs2_full_dirent *fd; 462 int namelen; 463 uint32_t alloclen; 464 int ret; 465 466 mode |= S_IFDIR; 467 468 ri = jffs2_alloc_raw_inode(); 469 if (!ri) 470 return -ENOMEM; 471 472 c = JFFS2_SB_INFO(dir_i->i_sb); 473 474 /* Try to reserve enough space for both node and dirent. 475 * Just the node will do for now, though 476 */ 477 namelen = dentry->d_name.len; 478 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 479 JFFS2_SUMMARY_INODE_SIZE); 480 481 if (ret) { 482 jffs2_free_raw_inode(ri); 483 return ret; 484 } 485 486 inode = jffs2_new_inode(dir_i, mode, ri); 487 488 if (IS_ERR(inode)) { 489 jffs2_free_raw_inode(ri); 490 jffs2_complete_reservation(c); 491 return PTR_ERR(inode); 492 } 493 494 inode->i_op = &jffs2_dir_inode_operations; 495 inode->i_fop = &jffs2_dir_operations; 496 /* Directories get nlink 2 at start */ 497 inode->i_nlink = 2; 498 499 f = JFFS2_INODE_INFO(inode); 500 501 ri->data_crc = cpu_to_je32(0); 502 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 503 504 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 505 506 jffs2_free_raw_inode(ri); 507 508 if (IS_ERR(fn)) { 509 /* Eeek. Wave bye bye */ 510 up(&f->sem); 511 jffs2_complete_reservation(c); 512 jffs2_clear_inode(inode); 513 return PTR_ERR(fn); 514 } 515 /* No data here. Only a metadata node, which will be 516 obsoleted by the first data write 517 */ 518 f->metadata = fn; 519 up(&f->sem); 520 521 jffs2_complete_reservation(c); 522 523 ret = jffs2_init_security(inode, dir_i); 524 if (ret) { 525 jffs2_clear_inode(inode); 526 return ret; 527 } 528 ret = jffs2_init_acl_post(inode); 529 if (ret) { 530 jffs2_clear_inode(inode); 531 return ret; 532 } 533 534 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 535 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 536 if (ret) { 537 /* Eep. */ 538 jffs2_clear_inode(inode); 539 return ret; 540 } 541 542 rd = jffs2_alloc_raw_dirent(); 543 if (!rd) { 544 /* Argh. Now we treat it like a normal delete */ 545 jffs2_complete_reservation(c); 546 jffs2_clear_inode(inode); 547 return -ENOMEM; 548 } 549 550 dir_f = JFFS2_INODE_INFO(dir_i); 551 down(&dir_f->sem); 552 553 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 554 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 555 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 556 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 557 558 rd->pino = cpu_to_je32(dir_i->i_ino); 559 rd->version = cpu_to_je32(++dir_f->highest_version); 560 rd->ino = cpu_to_je32(inode->i_ino); 561 rd->mctime = cpu_to_je32(get_seconds()); 562 rd->nsize = namelen; 563 rd->type = DT_DIR; 564 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 565 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 566 567 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 568 569 if (IS_ERR(fd)) { 570 /* dirent failed to write. Delete the inode normally 571 as if it were the final unlink() */ 572 jffs2_complete_reservation(c); 573 jffs2_free_raw_dirent(rd); 574 up(&dir_f->sem); 575 jffs2_clear_inode(inode); 576 return PTR_ERR(fd); 577 } 578 579 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 580 inc_nlink(dir_i); 581 582 jffs2_free_raw_dirent(rd); 583 584 /* Link the fd into the inode's list, obsoleting an old 585 one if necessary. */ 586 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 587 588 up(&dir_f->sem); 589 jffs2_complete_reservation(c); 590 591 d_instantiate(dentry, inode); 592 return 0; 593 } 594 595 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 596 { 597 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 598 struct jffs2_full_dirent *fd; 599 int ret; 600 601 for (fd = f->dents ; fd; fd = fd->next) { 602 if (fd->ino) 603 return -ENOTEMPTY; 604 } 605 ret = jffs2_unlink(dir_i, dentry); 606 if (!ret) 607 drop_nlink(dir_i); 608 return ret; 609 } 610 611 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 612 { 613 struct jffs2_inode_info *f, *dir_f; 614 struct jffs2_sb_info *c; 615 struct inode *inode; 616 struct jffs2_raw_inode *ri; 617 struct jffs2_raw_dirent *rd; 618 struct jffs2_full_dnode *fn; 619 struct jffs2_full_dirent *fd; 620 int namelen; 621 union jffs2_device_node dev; 622 int devlen = 0; 623 uint32_t alloclen; 624 int ret; 625 626 if (!new_valid_dev(rdev)) 627 return -EINVAL; 628 629 ri = jffs2_alloc_raw_inode(); 630 if (!ri) 631 return -ENOMEM; 632 633 c = JFFS2_SB_INFO(dir_i->i_sb); 634 635 if (S_ISBLK(mode) || S_ISCHR(mode)) 636 devlen = jffs2_encode_dev(&dev, rdev); 637 638 /* Try to reserve enough space for both node and dirent. 639 * Just the node will do for now, though 640 */ 641 namelen = dentry->d_name.len; 642 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 643 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 644 645 if (ret) { 646 jffs2_free_raw_inode(ri); 647 return ret; 648 } 649 650 inode = jffs2_new_inode(dir_i, mode, ri); 651 652 if (IS_ERR(inode)) { 653 jffs2_free_raw_inode(ri); 654 jffs2_complete_reservation(c); 655 return PTR_ERR(inode); 656 } 657 inode->i_op = &jffs2_file_inode_operations; 658 init_special_inode(inode, inode->i_mode, rdev); 659 660 f = JFFS2_INODE_INFO(inode); 661 662 ri->dsize = ri->csize = cpu_to_je32(devlen); 663 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 664 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 665 666 ri->compr = JFFS2_COMPR_NONE; 667 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 668 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 669 670 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 671 672 jffs2_free_raw_inode(ri); 673 674 if (IS_ERR(fn)) { 675 /* Eeek. Wave bye bye */ 676 up(&f->sem); 677 jffs2_complete_reservation(c); 678 jffs2_clear_inode(inode); 679 return PTR_ERR(fn); 680 } 681 /* No data here. Only a metadata node, which will be 682 obsoleted by the first data write 683 */ 684 f->metadata = fn; 685 up(&f->sem); 686 687 jffs2_complete_reservation(c); 688 689 ret = jffs2_init_security(inode, dir_i); 690 if (ret) { 691 jffs2_clear_inode(inode); 692 return ret; 693 } 694 ret = jffs2_init_acl_post(inode); 695 if (ret) { 696 jffs2_clear_inode(inode); 697 return ret; 698 } 699 700 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 701 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 702 if (ret) { 703 /* Eep. */ 704 jffs2_clear_inode(inode); 705 return ret; 706 } 707 708 rd = jffs2_alloc_raw_dirent(); 709 if (!rd) { 710 /* Argh. Now we treat it like a normal delete */ 711 jffs2_complete_reservation(c); 712 jffs2_clear_inode(inode); 713 return -ENOMEM; 714 } 715 716 dir_f = JFFS2_INODE_INFO(dir_i); 717 down(&dir_f->sem); 718 719 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 720 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 721 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 722 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 723 724 rd->pino = cpu_to_je32(dir_i->i_ino); 725 rd->version = cpu_to_je32(++dir_f->highest_version); 726 rd->ino = cpu_to_je32(inode->i_ino); 727 rd->mctime = cpu_to_je32(get_seconds()); 728 rd->nsize = namelen; 729 730 /* XXX: This is ugly. */ 731 rd->type = (mode & S_IFMT) >> 12; 732 733 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 734 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 735 736 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 737 738 if (IS_ERR(fd)) { 739 /* dirent failed to write. Delete the inode normally 740 as if it were the final unlink() */ 741 jffs2_complete_reservation(c); 742 jffs2_free_raw_dirent(rd); 743 up(&dir_f->sem); 744 jffs2_clear_inode(inode); 745 return PTR_ERR(fd); 746 } 747 748 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 749 750 jffs2_free_raw_dirent(rd); 751 752 /* Link the fd into the inode's list, obsoleting an old 753 one if necessary. */ 754 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 755 756 up(&dir_f->sem); 757 jffs2_complete_reservation(c); 758 759 d_instantiate(dentry, inode); 760 761 return 0; 762 } 763 764 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 765 struct inode *new_dir_i, struct dentry *new_dentry) 766 { 767 int ret; 768 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 769 struct jffs2_inode_info *victim_f = NULL; 770 uint8_t type; 771 uint32_t now; 772 773 /* The VFS will check for us and prevent trying to rename a 774 * file over a directory and vice versa, but if it's a directory, 775 * the VFS can't check whether the victim is empty. The filesystem 776 * needs to do that for itself. 777 */ 778 if (new_dentry->d_inode) { 779 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 780 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 781 struct jffs2_full_dirent *fd; 782 783 down(&victim_f->sem); 784 for (fd = victim_f->dents; fd; fd = fd->next) { 785 if (fd->ino) { 786 up(&victim_f->sem); 787 return -ENOTEMPTY; 788 } 789 } 790 up(&victim_f->sem); 791 } 792 } 793 794 /* XXX: We probably ought to alloc enough space for 795 both nodes at the same time. Writing the new link, 796 then getting -ENOSPC, is quite bad :) 797 */ 798 799 /* Make a hard link */ 800 801 /* XXX: This is ugly */ 802 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 803 if (!type) type = DT_REG; 804 805 now = get_seconds(); 806 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 807 old_dentry->d_inode->i_ino, type, 808 new_dentry->d_name.name, new_dentry->d_name.len, now); 809 810 if (ret) 811 return ret; 812 813 if (victim_f) { 814 /* There was a victim. Kill it off nicely */ 815 drop_nlink(new_dentry->d_inode); 816 /* Don't oops if the victim was a dirent pointing to an 817 inode which didn't exist. */ 818 if (victim_f->inocache) { 819 down(&victim_f->sem); 820 victim_f->inocache->nlink--; 821 up(&victim_f->sem); 822 } 823 } 824 825 /* If it was a directory we moved, and there was no victim, 826 increase i_nlink on its new parent */ 827 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 828 inc_nlink(new_dir_i); 829 830 /* Unlink the original */ 831 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 832 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 833 834 /* We don't touch inode->i_nlink */ 835 836 if (ret) { 837 /* Oh shit. We really ought to make a single node which can do both atomically */ 838 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 839 down(&f->sem); 840 inc_nlink(old_dentry->d_inode); 841 if (f->inocache) 842 f->inocache->nlink++; 843 up(&f->sem); 844 845 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 846 /* Might as well let the VFS know */ 847 d_instantiate(new_dentry, old_dentry->d_inode); 848 atomic_inc(&old_dentry->d_inode->i_count); 849 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 850 return ret; 851 } 852 853 if (S_ISDIR(old_dentry->d_inode->i_mode)) 854 drop_nlink(old_dir_i); 855 856 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 857 858 return 0; 859 } 860 861