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, 219 dentry->d_name.name, dentry->d_name.len); 220 if (ret) 221 goto fail; 222 223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 224 225 jffs2_free_raw_inode(ri); 226 227 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 228 inode->i_ino, inode->i_mode, inode->i_nlink, 229 f->inocache->pino_nlink, inode->i_mapping->nrpages)); 230 231 d_instantiate(dentry, inode); 232 unlock_new_inode(inode); 233 return 0; 234 235 fail: 236 iget_failed(inode); 237 jffs2_free_raw_inode(ri); 238 return ret; 239 } 240 241 /***********************************************************************/ 242 243 244 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 245 { 246 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 247 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 248 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 249 int ret; 250 uint32_t now = get_seconds(); 251 252 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 253 dentry->d_name.len, dead_f, now); 254 if (dead_f->inocache) 255 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; 256 if (!ret) 257 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 258 return ret; 259 } 260 /***********************************************************************/ 261 262 263 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 264 { 265 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 266 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 267 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 268 int ret; 269 uint8_t type; 270 uint32_t now; 271 272 /* Don't let people make hard links to bad inodes. */ 273 if (!f->inocache) 274 return -EIO; 275 276 if (S_ISDIR(old_dentry->d_inode->i_mode)) 277 return -EPERM; 278 279 /* XXX: This is ugly */ 280 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 281 if (!type) type = DT_REG; 282 283 now = get_seconds(); 284 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 285 286 if (!ret) { 287 mutex_lock(&f->sem); 288 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; 289 mutex_unlock(&f->sem); 290 d_instantiate(dentry, old_dentry->d_inode); 291 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 292 ihold(old_dentry->d_inode); 293 } 294 return ret; 295 } 296 297 /***********************************************************************/ 298 299 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 300 { 301 struct jffs2_inode_info *f, *dir_f; 302 struct jffs2_sb_info *c; 303 struct inode *inode; 304 struct jffs2_raw_inode *ri; 305 struct jffs2_raw_dirent *rd; 306 struct jffs2_full_dnode *fn; 307 struct jffs2_full_dirent *fd; 308 int namelen; 309 uint32_t alloclen; 310 int ret, targetlen = strlen(target); 311 312 /* FIXME: If you care. We'd need to use frags for the target 313 if it grows much more than this */ 314 if (targetlen > 254) 315 return -ENAMETOOLONG; 316 317 ri = jffs2_alloc_raw_inode(); 318 319 if (!ri) 320 return -ENOMEM; 321 322 c = JFFS2_SB_INFO(dir_i->i_sb); 323 324 /* Try to reserve enough space for both node and dirent. 325 * Just the node will do for now, though 326 */ 327 namelen = dentry->d_name.len; 328 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 329 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 330 331 if (ret) { 332 jffs2_free_raw_inode(ri); 333 return ret; 334 } 335 336 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 337 338 if (IS_ERR(inode)) { 339 jffs2_free_raw_inode(ri); 340 jffs2_complete_reservation(c); 341 return PTR_ERR(inode); 342 } 343 344 inode->i_op = &jffs2_symlink_inode_operations; 345 346 f = JFFS2_INODE_INFO(inode); 347 348 inode->i_size = targetlen; 349 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 350 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 351 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 352 353 ri->compr = JFFS2_COMPR_NONE; 354 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 355 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 356 357 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 358 359 jffs2_free_raw_inode(ri); 360 361 if (IS_ERR(fn)) { 362 /* Eeek. Wave bye bye */ 363 mutex_unlock(&f->sem); 364 jffs2_complete_reservation(c); 365 ret = PTR_ERR(fn); 366 goto fail; 367 } 368 369 /* We use f->target field to store the target path. */ 370 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 371 if (!f->target) { 372 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 373 mutex_unlock(&f->sem); 374 jffs2_complete_reservation(c); 375 ret = -ENOMEM; 376 goto fail; 377 } 378 379 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 mutex_unlock(&f->sem); 386 387 jffs2_complete_reservation(c); 388 389 ret = jffs2_init_security(inode, dir_i); 390 if (ret) 391 goto fail; 392 393 ret = jffs2_init_acl_post(inode); 394 if (ret) 395 goto fail; 396 397 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 398 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 399 if (ret) 400 goto fail; 401 402 rd = jffs2_alloc_raw_dirent(); 403 if (!rd) { 404 /* Argh. Now we treat it like a normal delete */ 405 jffs2_complete_reservation(c); 406 ret = -ENOMEM; 407 goto fail; 408 } 409 410 dir_f = JFFS2_INODE_INFO(dir_i); 411 mutex_lock(&dir_f->sem); 412 413 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 414 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 415 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 416 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 417 418 rd->pino = cpu_to_je32(dir_i->i_ino); 419 rd->version = cpu_to_je32(++dir_f->highest_version); 420 rd->ino = cpu_to_je32(inode->i_ino); 421 rd->mctime = cpu_to_je32(get_seconds()); 422 rd->nsize = namelen; 423 rd->type = DT_LNK; 424 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 425 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 426 427 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 428 429 if (IS_ERR(fd)) { 430 /* dirent failed to write. Delete the inode normally 431 as if it were the final unlink() */ 432 jffs2_complete_reservation(c); 433 jffs2_free_raw_dirent(rd); 434 mutex_unlock(&dir_f->sem); 435 ret = PTR_ERR(fd); 436 goto fail; 437 } 438 439 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 440 441 jffs2_free_raw_dirent(rd); 442 443 /* Link the fd into the inode's list, obsoleting an old 444 one if necessary. */ 445 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 446 447 mutex_unlock(&dir_f->sem); 448 jffs2_complete_reservation(c); 449 450 d_instantiate(dentry, inode); 451 unlock_new_inode(inode); 452 return 0; 453 454 fail: 455 iget_failed(inode); 456 return ret; 457 } 458 459 460 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 461 { 462 struct jffs2_inode_info *f, *dir_f; 463 struct jffs2_sb_info *c; 464 struct inode *inode; 465 struct jffs2_raw_inode *ri; 466 struct jffs2_raw_dirent *rd; 467 struct jffs2_full_dnode *fn; 468 struct jffs2_full_dirent *fd; 469 int namelen; 470 uint32_t alloclen; 471 int ret; 472 473 mode |= S_IFDIR; 474 475 ri = jffs2_alloc_raw_inode(); 476 if (!ri) 477 return -ENOMEM; 478 479 c = JFFS2_SB_INFO(dir_i->i_sb); 480 481 /* Try to reserve enough space for both node and dirent. 482 * Just the node will do for now, though 483 */ 484 namelen = dentry->d_name.len; 485 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 486 JFFS2_SUMMARY_INODE_SIZE); 487 488 if (ret) { 489 jffs2_free_raw_inode(ri); 490 return ret; 491 } 492 493 inode = jffs2_new_inode(dir_i, mode, ri); 494 495 if (IS_ERR(inode)) { 496 jffs2_free_raw_inode(ri); 497 jffs2_complete_reservation(c); 498 return PTR_ERR(inode); 499 } 500 501 inode->i_op = &jffs2_dir_inode_operations; 502 inode->i_fop = &jffs2_dir_operations; 503 504 f = JFFS2_INODE_INFO(inode); 505 506 /* Directories get nlink 2 at start */ 507 inode->i_nlink = 2; 508 /* but ic->pino_nlink is the parent ino# */ 509 f->inocache->pino_nlink = dir_i->i_ino; 510 511 ri->data_crc = cpu_to_je32(0); 512 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 513 514 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 515 516 jffs2_free_raw_inode(ri); 517 518 if (IS_ERR(fn)) { 519 /* Eeek. Wave bye bye */ 520 mutex_unlock(&f->sem); 521 jffs2_complete_reservation(c); 522 ret = PTR_ERR(fn); 523 goto fail; 524 } 525 /* No data here. Only a metadata node, which will be 526 obsoleted by the first data write 527 */ 528 f->metadata = fn; 529 mutex_unlock(&f->sem); 530 531 jffs2_complete_reservation(c); 532 533 ret = jffs2_init_security(inode, dir_i); 534 if (ret) 535 goto fail; 536 537 ret = jffs2_init_acl_post(inode); 538 if (ret) 539 goto fail; 540 541 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 542 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 543 if (ret) 544 goto fail; 545 546 rd = jffs2_alloc_raw_dirent(); 547 if (!rd) { 548 /* Argh. Now we treat it like a normal delete */ 549 jffs2_complete_reservation(c); 550 ret = -ENOMEM; 551 goto fail; 552 } 553 554 dir_f = JFFS2_INODE_INFO(dir_i); 555 mutex_lock(&dir_f->sem); 556 557 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 558 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 559 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 560 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 561 562 rd->pino = cpu_to_je32(dir_i->i_ino); 563 rd->version = cpu_to_je32(++dir_f->highest_version); 564 rd->ino = cpu_to_je32(inode->i_ino); 565 rd->mctime = cpu_to_je32(get_seconds()); 566 rd->nsize = namelen; 567 rd->type = DT_DIR; 568 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 569 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 570 571 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 572 573 if (IS_ERR(fd)) { 574 /* dirent failed to write. Delete the inode normally 575 as if it were the final unlink() */ 576 jffs2_complete_reservation(c); 577 jffs2_free_raw_dirent(rd); 578 mutex_unlock(&dir_f->sem); 579 ret = PTR_ERR(fd); 580 goto fail; 581 } 582 583 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 584 inc_nlink(dir_i); 585 586 jffs2_free_raw_dirent(rd); 587 588 /* Link the fd into the inode's list, obsoleting an old 589 one if necessary. */ 590 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 591 592 mutex_unlock(&dir_f->sem); 593 jffs2_complete_reservation(c); 594 595 d_instantiate(dentry, inode); 596 unlock_new_inode(inode); 597 return 0; 598 599 fail: 600 iget_failed(inode); 601 return ret; 602 } 603 604 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 605 { 606 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 607 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 608 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 609 struct jffs2_full_dirent *fd; 610 int ret; 611 uint32_t now = get_seconds(); 612 613 for (fd = f->dents ; fd; fd = fd->next) { 614 if (fd->ino) 615 return -ENOTEMPTY; 616 } 617 618 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 619 dentry->d_name.len, f, now); 620 if (!ret) { 621 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 622 clear_nlink(dentry->d_inode); 623 drop_nlink(dir_i); 624 } 625 return ret; 626 } 627 628 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 629 { 630 struct jffs2_inode_info *f, *dir_f; 631 struct jffs2_sb_info *c; 632 struct inode *inode; 633 struct jffs2_raw_inode *ri; 634 struct jffs2_raw_dirent *rd; 635 struct jffs2_full_dnode *fn; 636 struct jffs2_full_dirent *fd; 637 int namelen; 638 union jffs2_device_node dev; 639 int devlen = 0; 640 uint32_t alloclen; 641 int ret; 642 643 if (!new_valid_dev(rdev)) 644 return -EINVAL; 645 646 ri = jffs2_alloc_raw_inode(); 647 if (!ri) 648 return -ENOMEM; 649 650 c = JFFS2_SB_INFO(dir_i->i_sb); 651 652 if (S_ISBLK(mode) || S_ISCHR(mode)) 653 devlen = jffs2_encode_dev(&dev, rdev); 654 655 /* Try to reserve enough space for both node and dirent. 656 * Just the node will do for now, though 657 */ 658 namelen = dentry->d_name.len; 659 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 660 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 661 662 if (ret) { 663 jffs2_free_raw_inode(ri); 664 return ret; 665 } 666 667 inode = jffs2_new_inode(dir_i, mode, ri); 668 669 if (IS_ERR(inode)) { 670 jffs2_free_raw_inode(ri); 671 jffs2_complete_reservation(c); 672 return PTR_ERR(inode); 673 } 674 inode->i_op = &jffs2_file_inode_operations; 675 init_special_inode(inode, inode->i_mode, rdev); 676 677 f = JFFS2_INODE_INFO(inode); 678 679 ri->dsize = ri->csize = cpu_to_je32(devlen); 680 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 681 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 682 683 ri->compr = JFFS2_COMPR_NONE; 684 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 685 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 686 687 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 688 689 jffs2_free_raw_inode(ri); 690 691 if (IS_ERR(fn)) { 692 /* Eeek. Wave bye bye */ 693 mutex_unlock(&f->sem); 694 jffs2_complete_reservation(c); 695 ret = PTR_ERR(fn); 696 goto fail; 697 } 698 /* No data here. Only a metadata node, which will be 699 obsoleted by the first data write 700 */ 701 f->metadata = fn; 702 mutex_unlock(&f->sem); 703 704 jffs2_complete_reservation(c); 705 706 ret = jffs2_init_security(inode, dir_i); 707 if (ret) 708 goto fail; 709 710 ret = jffs2_init_acl_post(inode); 711 if (ret) 712 goto fail; 713 714 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 715 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 716 if (ret) 717 goto fail; 718 719 rd = jffs2_alloc_raw_dirent(); 720 if (!rd) { 721 /* Argh. Now we treat it like a normal delete */ 722 jffs2_complete_reservation(c); 723 ret = -ENOMEM; 724 goto fail; 725 } 726 727 dir_f = JFFS2_INODE_INFO(dir_i); 728 mutex_lock(&dir_f->sem); 729 730 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 731 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 732 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 733 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 734 735 rd->pino = cpu_to_je32(dir_i->i_ino); 736 rd->version = cpu_to_je32(++dir_f->highest_version); 737 rd->ino = cpu_to_je32(inode->i_ino); 738 rd->mctime = cpu_to_je32(get_seconds()); 739 rd->nsize = namelen; 740 741 /* XXX: This is ugly. */ 742 rd->type = (mode & S_IFMT) >> 12; 743 744 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 745 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 746 747 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 748 749 if (IS_ERR(fd)) { 750 /* dirent failed to write. Delete the inode normally 751 as if it were the final unlink() */ 752 jffs2_complete_reservation(c); 753 jffs2_free_raw_dirent(rd); 754 mutex_unlock(&dir_f->sem); 755 ret = PTR_ERR(fd); 756 goto fail; 757 } 758 759 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 760 761 jffs2_free_raw_dirent(rd); 762 763 /* Link the fd into the inode's list, obsoleting an old 764 one if necessary. */ 765 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 766 767 mutex_unlock(&dir_f->sem); 768 jffs2_complete_reservation(c); 769 770 d_instantiate(dentry, inode); 771 unlock_new_inode(inode); 772 return 0; 773 774 fail: 775 iget_failed(inode); 776 return ret; 777 } 778 779 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 780 struct inode *new_dir_i, struct dentry *new_dentry) 781 { 782 int ret; 783 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 784 struct jffs2_inode_info *victim_f = NULL; 785 uint8_t type; 786 uint32_t now; 787 788 /* The VFS will check for us and prevent trying to rename a 789 * file over a directory and vice versa, but if it's a directory, 790 * the VFS can't check whether the victim is empty. The filesystem 791 * needs to do that for itself. 792 */ 793 if (new_dentry->d_inode) { 794 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 795 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 796 struct jffs2_full_dirent *fd; 797 798 mutex_lock(&victim_f->sem); 799 for (fd = victim_f->dents; fd; fd = fd->next) { 800 if (fd->ino) { 801 mutex_unlock(&victim_f->sem); 802 return -ENOTEMPTY; 803 } 804 } 805 mutex_unlock(&victim_f->sem); 806 } 807 } 808 809 /* XXX: We probably ought to alloc enough space for 810 both nodes at the same time. Writing the new link, 811 then getting -ENOSPC, is quite bad :) 812 */ 813 814 /* Make a hard link */ 815 816 /* XXX: This is ugly */ 817 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 818 if (!type) type = DT_REG; 819 820 now = get_seconds(); 821 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 822 old_dentry->d_inode->i_ino, type, 823 new_dentry->d_name.name, new_dentry->d_name.len, now); 824 825 if (ret) 826 return ret; 827 828 if (victim_f) { 829 /* There was a victim. Kill it off nicely */ 830 drop_nlink(new_dentry->d_inode); 831 /* Don't oops if the victim was a dirent pointing to an 832 inode which didn't exist. */ 833 if (victim_f->inocache) { 834 mutex_lock(&victim_f->sem); 835 if (S_ISDIR(new_dentry->d_inode->i_mode)) 836 victim_f->inocache->pino_nlink = 0; 837 else 838 victim_f->inocache->pino_nlink--; 839 mutex_unlock(&victim_f->sem); 840 } 841 } 842 843 /* If it was a directory we moved, and there was no victim, 844 increase i_nlink on its new parent */ 845 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 846 inc_nlink(new_dir_i); 847 848 /* Unlink the original */ 849 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 850 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 851 852 /* We don't touch inode->i_nlink */ 853 854 if (ret) { 855 /* Oh shit. We really ought to make a single node which can do both atomically */ 856 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 857 mutex_lock(&f->sem); 858 inc_nlink(old_dentry->d_inode); 859 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 860 f->inocache->pino_nlink++; 861 mutex_unlock(&f->sem); 862 863 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 864 /* Might as well let the VFS know */ 865 d_instantiate(new_dentry, old_dentry->d_inode); 866 ihold(old_dentry->d_inode); 867 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 868 return ret; 869 } 870 871 if (S_ISDIR(old_dentry->d_inode->i_mode)) 872 drop_nlink(old_dir_i); 873 874 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 875 876 return 0; 877 } 878 879