1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 6 * 7 * Created by David Woodhouse <dwmw2@infradead.org> 8 * 9 * For licensing information, see the file 'LICENCE' in this directory. 10 * 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/fs.h> 16 #include <linux/crc32.h> 17 #include <linux/jffs2.h> 18 #include "jffs2_fs_i.h" 19 #include "jffs2_fs_sb.h" 20 #include <linux/time.h> 21 #include "nodelist.h" 22 23 static int jffs2_readdir (struct file *, void *, filldir_t); 24 25 static int jffs2_create (struct inode *,struct dentry *,int, 26 struct nameidata *); 27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 28 struct nameidata *); 29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 30 static int jffs2_unlink (struct inode *,struct dentry *); 31 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 32 static int jffs2_mkdir (struct inode *,struct dentry *,int); 33 static int jffs2_rmdir (struct inode *,struct dentry *); 34 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 35 static int jffs2_rename (struct inode *, struct dentry *, 36 struct inode *, struct dentry *); 37 38 const struct file_operations jffs2_dir_operations = 39 { 40 .read = generic_read_dir, 41 .readdir = jffs2_readdir, 42 .unlocked_ioctl=jffs2_ioctl, 43 .fsync = jffs2_fsync, 44 .llseek = generic_file_llseek, 45 }; 46 47 48 const struct inode_operations jffs2_dir_inode_operations = 49 { 50 .create = jffs2_create, 51 .lookup = jffs2_lookup, 52 .link = jffs2_link, 53 .unlink = jffs2_unlink, 54 .symlink = jffs2_symlink, 55 .mkdir = jffs2_mkdir, 56 .rmdir = jffs2_rmdir, 57 .mknod = jffs2_mknod, 58 .rename = jffs2_rename, 59 .check_acl = jffs2_check_acl, 60 .setattr = jffs2_setattr, 61 .setxattr = jffs2_setxattr, 62 .getxattr = jffs2_getxattr, 63 .listxattr = jffs2_listxattr, 64 .removexattr = jffs2_removexattr 65 }; 66 67 /***********************************************************************/ 68 69 70 /* We keep the dirent list sorted in increasing order of name hash, 71 and we use the same hash function as the dentries. Makes this 72 nice and simple 73 */ 74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 75 struct nameidata *nd) 76 { 77 struct jffs2_inode_info *dir_f; 78 struct jffs2_sb_info *c; 79 struct jffs2_full_dirent *fd = NULL, *fd_list; 80 uint32_t ino = 0; 81 struct inode *inode = NULL; 82 83 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 84 85 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 86 return ERR_PTR(-ENAMETOOLONG); 87 88 dir_f = JFFS2_INODE_INFO(dir_i); 89 c = JFFS2_SB_INFO(dir_i->i_sb); 90 91 mutex_lock(&dir_f->sem); 92 93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 94 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 95 if (fd_list->nhash == target->d_name.hash && 96 (!fd || fd_list->version > fd->version) && 97 strlen(fd_list->name) == target->d_name.len && 98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 99 fd = fd_list; 100 } 101 } 102 if (fd) 103 ino = fd->ino; 104 mutex_unlock(&dir_f->sem); 105 if (ino) { 106 inode = jffs2_iget(dir_i->i_sb, ino); 107 if (IS_ERR(inode)) { 108 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 109 return ERR_CAST(inode); 110 } 111 } 112 113 return d_splice_alias(inode, target); 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 mutex_lock(&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 mutex_unlock(&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 /* jffs2_do_create() will want to lock it, _after_ reserving 212 space and taking c-alloc_sem. If we keep it locked here, 213 lockdep gets unhappy (although it's a false positive; 214 nothing else will be looking at this inode yet so there's 215 no chance of AB-BA deadlock involving its f->sem). */ 216 mutex_unlock(&f->sem); 217 218 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 219 if (ret) 220 goto fail; 221 222 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 223 224 jffs2_free_raw_inode(ri); 225 226 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 227 inode->i_ino, inode->i_mode, inode->i_nlink, 228 f->inocache->pino_nlink, inode->i_mapping->nrpages)); 229 230 d_instantiate(dentry, inode); 231 unlock_new_inode(inode); 232 return 0; 233 234 fail: 235 iget_failed(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->pino_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 mutex_lock(&f->sem); 287 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; 288 mutex_unlock(&f->sem); 289 d_instantiate(dentry, old_dentry->d_inode); 290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 291 ihold(old_dentry->d_inode); 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 -ENAMETOOLONG; 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 mutex_unlock(&f->sem); 363 jffs2_complete_reservation(c); 364 ret = PTR_ERR(fn); 365 goto fail; 366 } 367 368 /* We use f->target field to store the target path. */ 369 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 370 if (!f->target) { 371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 372 mutex_unlock(&f->sem); 373 jffs2_complete_reservation(c); 374 ret = -ENOMEM; 375 goto fail; 376 } 377 378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 379 380 /* No data here. Only a metadata node, which will be 381 obsoleted by the first data write 382 */ 383 f->metadata = fn; 384 mutex_unlock(&f->sem); 385 386 jffs2_complete_reservation(c); 387 388 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 389 if (ret) 390 goto fail; 391 392 ret = jffs2_init_acl_post(inode); 393 if (ret) 394 goto fail; 395 396 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 397 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 398 if (ret) 399 goto fail; 400 401 rd = jffs2_alloc_raw_dirent(); 402 if (!rd) { 403 /* Argh. Now we treat it like a normal delete */ 404 jffs2_complete_reservation(c); 405 ret = -ENOMEM; 406 goto fail; 407 } 408 409 dir_f = JFFS2_INODE_INFO(dir_i); 410 mutex_lock(&dir_f->sem); 411 412 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 413 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 414 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 415 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 416 417 rd->pino = cpu_to_je32(dir_i->i_ino); 418 rd->version = cpu_to_je32(++dir_f->highest_version); 419 rd->ino = cpu_to_je32(inode->i_ino); 420 rd->mctime = cpu_to_je32(get_seconds()); 421 rd->nsize = namelen; 422 rd->type = DT_LNK; 423 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 424 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 425 426 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 427 428 if (IS_ERR(fd)) { 429 /* dirent failed to write. Delete the inode normally 430 as if it were the final unlink() */ 431 jffs2_complete_reservation(c); 432 jffs2_free_raw_dirent(rd); 433 mutex_unlock(&dir_f->sem); 434 ret = PTR_ERR(fd); 435 goto fail; 436 } 437 438 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 439 440 jffs2_free_raw_dirent(rd); 441 442 /* Link the fd into the inode's list, obsoleting an old 443 one if necessary. */ 444 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 445 446 mutex_unlock(&dir_f->sem); 447 jffs2_complete_reservation(c); 448 449 d_instantiate(dentry, inode); 450 unlock_new_inode(inode); 451 return 0; 452 453 fail: 454 iget_failed(inode); 455 return ret; 456 } 457 458 459 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 460 { 461 struct jffs2_inode_info *f, *dir_f; 462 struct jffs2_sb_info *c; 463 struct inode *inode; 464 struct jffs2_raw_inode *ri; 465 struct jffs2_raw_dirent *rd; 466 struct jffs2_full_dnode *fn; 467 struct jffs2_full_dirent *fd; 468 int namelen; 469 uint32_t alloclen; 470 int ret; 471 472 mode |= S_IFDIR; 473 474 ri = jffs2_alloc_raw_inode(); 475 if (!ri) 476 return -ENOMEM; 477 478 c = JFFS2_SB_INFO(dir_i->i_sb); 479 480 /* Try to reserve enough space for both node and dirent. 481 * Just the node will do for now, though 482 */ 483 namelen = dentry->d_name.len; 484 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 485 JFFS2_SUMMARY_INODE_SIZE); 486 487 if (ret) { 488 jffs2_free_raw_inode(ri); 489 return ret; 490 } 491 492 inode = jffs2_new_inode(dir_i, mode, ri); 493 494 if (IS_ERR(inode)) { 495 jffs2_free_raw_inode(ri); 496 jffs2_complete_reservation(c); 497 return PTR_ERR(inode); 498 } 499 500 inode->i_op = &jffs2_dir_inode_operations; 501 inode->i_fop = &jffs2_dir_operations; 502 503 f = JFFS2_INODE_INFO(inode); 504 505 /* Directories get nlink 2 at start */ 506 inode->i_nlink = 2; 507 /* but ic->pino_nlink is the parent ino# */ 508 f->inocache->pino_nlink = dir_i->i_ino; 509 510 ri->data_crc = cpu_to_je32(0); 511 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 512 513 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 514 515 jffs2_free_raw_inode(ri); 516 517 if (IS_ERR(fn)) { 518 /* Eeek. Wave bye bye */ 519 mutex_unlock(&f->sem); 520 jffs2_complete_reservation(c); 521 ret = PTR_ERR(fn); 522 goto fail; 523 } 524 /* No data here. Only a metadata node, which will be 525 obsoleted by the first data write 526 */ 527 f->metadata = fn; 528 mutex_unlock(&f->sem); 529 530 jffs2_complete_reservation(c); 531 532 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 533 if (ret) 534 goto fail; 535 536 ret = jffs2_init_acl_post(inode); 537 if (ret) 538 goto fail; 539 540 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 541 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 542 if (ret) 543 goto fail; 544 545 rd = jffs2_alloc_raw_dirent(); 546 if (!rd) { 547 /* Argh. Now we treat it like a normal delete */ 548 jffs2_complete_reservation(c); 549 ret = -ENOMEM; 550 goto fail; 551 } 552 553 dir_f = JFFS2_INODE_INFO(dir_i); 554 mutex_lock(&dir_f->sem); 555 556 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 557 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 558 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 559 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 560 561 rd->pino = cpu_to_je32(dir_i->i_ino); 562 rd->version = cpu_to_je32(++dir_f->highest_version); 563 rd->ino = cpu_to_je32(inode->i_ino); 564 rd->mctime = cpu_to_je32(get_seconds()); 565 rd->nsize = namelen; 566 rd->type = DT_DIR; 567 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 568 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 569 570 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 571 572 if (IS_ERR(fd)) { 573 /* dirent failed to write. Delete the inode normally 574 as if it were the final unlink() */ 575 jffs2_complete_reservation(c); 576 jffs2_free_raw_dirent(rd); 577 mutex_unlock(&dir_f->sem); 578 ret = PTR_ERR(fd); 579 goto fail; 580 } 581 582 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 583 inc_nlink(dir_i); 584 585 jffs2_free_raw_dirent(rd); 586 587 /* Link the fd into the inode's list, obsoleting an old 588 one if necessary. */ 589 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 590 591 mutex_unlock(&dir_f->sem); 592 jffs2_complete_reservation(c); 593 594 d_instantiate(dentry, inode); 595 unlock_new_inode(inode); 596 return 0; 597 598 fail: 599 iget_failed(inode); 600 return ret; 601 } 602 603 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 604 { 605 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 606 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 608 struct jffs2_full_dirent *fd; 609 int ret; 610 uint32_t now = get_seconds(); 611 612 for (fd = f->dents ; fd; fd = fd->next) { 613 if (fd->ino) 614 return -ENOTEMPTY; 615 } 616 617 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 618 dentry->d_name.len, f, now); 619 if (!ret) { 620 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 621 clear_nlink(dentry->d_inode); 622 drop_nlink(dir_i); 623 } 624 return ret; 625 } 626 627 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 628 { 629 struct jffs2_inode_info *f, *dir_f; 630 struct jffs2_sb_info *c; 631 struct inode *inode; 632 struct jffs2_raw_inode *ri; 633 struct jffs2_raw_dirent *rd; 634 struct jffs2_full_dnode *fn; 635 struct jffs2_full_dirent *fd; 636 int namelen; 637 union jffs2_device_node dev; 638 int devlen = 0; 639 uint32_t alloclen; 640 int ret; 641 642 if (!new_valid_dev(rdev)) 643 return -EINVAL; 644 645 ri = jffs2_alloc_raw_inode(); 646 if (!ri) 647 return -ENOMEM; 648 649 c = JFFS2_SB_INFO(dir_i->i_sb); 650 651 if (S_ISBLK(mode) || S_ISCHR(mode)) 652 devlen = jffs2_encode_dev(&dev, rdev); 653 654 /* Try to reserve enough space for both node and dirent. 655 * Just the node will do for now, though 656 */ 657 namelen = dentry->d_name.len; 658 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 659 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 660 661 if (ret) { 662 jffs2_free_raw_inode(ri); 663 return ret; 664 } 665 666 inode = jffs2_new_inode(dir_i, mode, ri); 667 668 if (IS_ERR(inode)) { 669 jffs2_free_raw_inode(ri); 670 jffs2_complete_reservation(c); 671 return PTR_ERR(inode); 672 } 673 inode->i_op = &jffs2_file_inode_operations; 674 init_special_inode(inode, inode->i_mode, rdev); 675 676 f = JFFS2_INODE_INFO(inode); 677 678 ri->dsize = ri->csize = cpu_to_je32(devlen); 679 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 680 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 681 682 ri->compr = JFFS2_COMPR_NONE; 683 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 684 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 685 686 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 687 688 jffs2_free_raw_inode(ri); 689 690 if (IS_ERR(fn)) { 691 /* Eeek. Wave bye bye */ 692 mutex_unlock(&f->sem); 693 jffs2_complete_reservation(c); 694 ret = PTR_ERR(fn); 695 goto fail; 696 } 697 /* No data here. Only a metadata node, which will be 698 obsoleted by the first data write 699 */ 700 f->metadata = fn; 701 mutex_unlock(&f->sem); 702 703 jffs2_complete_reservation(c); 704 705 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 706 if (ret) 707 goto fail; 708 709 ret = jffs2_init_acl_post(inode); 710 if (ret) 711 goto fail; 712 713 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 714 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 715 if (ret) 716 goto fail; 717 718 rd = jffs2_alloc_raw_dirent(); 719 if (!rd) { 720 /* Argh. Now we treat it like a normal delete */ 721 jffs2_complete_reservation(c); 722 ret = -ENOMEM; 723 goto fail; 724 } 725 726 dir_f = JFFS2_INODE_INFO(dir_i); 727 mutex_lock(&dir_f->sem); 728 729 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 730 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 731 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 732 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 733 734 rd->pino = cpu_to_je32(dir_i->i_ino); 735 rd->version = cpu_to_je32(++dir_f->highest_version); 736 rd->ino = cpu_to_je32(inode->i_ino); 737 rd->mctime = cpu_to_je32(get_seconds()); 738 rd->nsize = namelen; 739 740 /* XXX: This is ugly. */ 741 rd->type = (mode & S_IFMT) >> 12; 742 743 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 744 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 745 746 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 747 748 if (IS_ERR(fd)) { 749 /* dirent failed to write. Delete the inode normally 750 as if it were the final unlink() */ 751 jffs2_complete_reservation(c); 752 jffs2_free_raw_dirent(rd); 753 mutex_unlock(&dir_f->sem); 754 ret = PTR_ERR(fd); 755 goto fail; 756 } 757 758 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 759 760 jffs2_free_raw_dirent(rd); 761 762 /* Link the fd into the inode's list, obsoleting an old 763 one if necessary. */ 764 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 765 766 mutex_unlock(&dir_f->sem); 767 jffs2_complete_reservation(c); 768 769 d_instantiate(dentry, inode); 770 unlock_new_inode(inode); 771 return 0; 772 773 fail: 774 iget_failed(inode); 775 return ret; 776 } 777 778 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 779 struct inode *new_dir_i, struct dentry *new_dentry) 780 { 781 int ret; 782 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 783 struct jffs2_inode_info *victim_f = NULL; 784 uint8_t type; 785 uint32_t now; 786 787 /* The VFS will check for us and prevent trying to rename a 788 * file over a directory and vice versa, but if it's a directory, 789 * the VFS can't check whether the victim is empty. The filesystem 790 * needs to do that for itself. 791 */ 792 if (new_dentry->d_inode) { 793 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 794 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 795 struct jffs2_full_dirent *fd; 796 797 mutex_lock(&victim_f->sem); 798 for (fd = victim_f->dents; fd; fd = fd->next) { 799 if (fd->ino) { 800 mutex_unlock(&victim_f->sem); 801 return -ENOTEMPTY; 802 } 803 } 804 mutex_unlock(&victim_f->sem); 805 } 806 } 807 808 /* XXX: We probably ought to alloc enough space for 809 both nodes at the same time. Writing the new link, 810 then getting -ENOSPC, is quite bad :) 811 */ 812 813 /* Make a hard link */ 814 815 /* XXX: This is ugly */ 816 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 817 if (!type) type = DT_REG; 818 819 now = get_seconds(); 820 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 821 old_dentry->d_inode->i_ino, type, 822 new_dentry->d_name.name, new_dentry->d_name.len, now); 823 824 if (ret) 825 return ret; 826 827 if (victim_f) { 828 /* There was a victim. Kill it off nicely */ 829 drop_nlink(new_dentry->d_inode); 830 /* Don't oops if the victim was a dirent pointing to an 831 inode which didn't exist. */ 832 if (victim_f->inocache) { 833 mutex_lock(&victim_f->sem); 834 if (S_ISDIR(new_dentry->d_inode->i_mode)) 835 victim_f->inocache->pino_nlink = 0; 836 else 837 victim_f->inocache->pino_nlink--; 838 mutex_unlock(&victim_f->sem); 839 } 840 } 841 842 /* If it was a directory we moved, and there was no victim, 843 increase i_nlink on its new parent */ 844 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 845 inc_nlink(new_dir_i); 846 847 /* Unlink the original */ 848 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 849 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 850 851 /* We don't touch inode->i_nlink */ 852 853 if (ret) { 854 /* Oh shit. We really ought to make a single node which can do both atomically */ 855 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 856 mutex_lock(&f->sem); 857 inc_nlink(old_dentry->d_inode); 858 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 859 f->inocache->pino_nlink++; 860 mutex_unlock(&f->sem); 861 862 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 863 /* Might as well let the VFS know */ 864 d_instantiate(new_dentry, old_dentry->d_inode); 865 ihold(old_dentry->d_inode); 866 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 867 return ret; 868 } 869 870 if (S_ISDIR(old_dentry->d_inode->i_mode)) 871 drop_nlink(old_dir_i); 872 873 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 874 875 return 0; 876 } 877 878