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_full_dirent *fd = NULL, *fd_list; 79 uint32_t ino = 0; 80 struct inode *inode = NULL; 81 82 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 83 84 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 85 return ERR_PTR(-ENAMETOOLONG); 86 87 dir_f = JFFS2_INODE_INFO(dir_i); 88 89 mutex_lock(&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 mutex_unlock(&dir_f->sem); 103 if (ino) { 104 inode = jffs2_iget(dir_i->i_sb, ino); 105 if (IS_ERR(inode)) { 106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 107 return ERR_CAST(inode); 108 } 109 } 110 111 return d_splice_alias(inode, target); 112 } 113 114 /***********************************************************************/ 115 116 117 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 118 { 119 struct jffs2_inode_info *f; 120 struct inode *inode = filp->f_path.dentry->d_inode; 121 struct jffs2_full_dirent *fd; 122 unsigned long offset, curofs; 123 124 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 125 126 f = JFFS2_INODE_INFO(inode); 127 128 offset = filp->f_pos; 129 130 if (offset == 0) { 131 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 132 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 133 goto out; 134 offset++; 135 } 136 if (offset == 1) { 137 unsigned long pino = parent_ino(filp->f_path.dentry); 138 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 139 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 140 goto out; 141 offset++; 142 } 143 144 curofs=1; 145 mutex_lock(&f->sem); 146 for (fd = f->dents; fd; fd = fd->next) { 147 148 curofs++; 149 /* First loop: curofs = 2; offset = 2 */ 150 if (curofs < offset) { 151 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 152 fd->name, fd->ino, fd->type, curofs, offset)); 153 continue; 154 } 155 if (!fd->ino) { 156 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 157 offset++; 158 continue; 159 } 160 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 161 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 162 break; 163 offset++; 164 } 165 mutex_unlock(&f->sem); 166 out: 167 filp->f_pos = offset; 168 return 0; 169 } 170 171 /***********************************************************************/ 172 173 174 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 175 struct nameidata *nd) 176 { 177 struct jffs2_raw_inode *ri; 178 struct jffs2_inode_info *f, *dir_f; 179 struct jffs2_sb_info *c; 180 struct inode *inode; 181 int ret; 182 183 ri = jffs2_alloc_raw_inode(); 184 if (!ri) 185 return -ENOMEM; 186 187 c = JFFS2_SB_INFO(dir_i->i_sb); 188 189 D1(printk(KERN_DEBUG "jffs2_create()\n")); 190 191 inode = jffs2_new_inode(dir_i, mode, ri); 192 193 if (IS_ERR(inode)) { 194 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 195 jffs2_free_raw_inode(ri); 196 return PTR_ERR(inode); 197 } 198 199 inode->i_op = &jffs2_file_inode_operations; 200 inode->i_fop = &jffs2_file_operations; 201 inode->i_mapping->a_ops = &jffs2_file_address_operations; 202 inode->i_mapping->nrpages = 0; 203 204 f = JFFS2_INODE_INFO(inode); 205 dir_f = JFFS2_INODE_INFO(dir_i); 206 207 /* jffs2_do_create() will want to lock it, _after_ reserving 208 space and taking c-alloc_sem. If we keep it locked here, 209 lockdep gets unhappy (although it's a false positive; 210 nothing else will be looking at this inode yet so there's 211 no chance of AB-BA deadlock involving its f->sem). */ 212 mutex_unlock(&f->sem); 213 214 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 215 if (ret) 216 goto fail; 217 218 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 219 220 jffs2_free_raw_inode(ri); 221 222 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 223 inode->i_ino, inode->i_mode, inode->i_nlink, 224 f->inocache->pino_nlink, inode->i_mapping->nrpages)); 225 226 d_instantiate(dentry, inode); 227 unlock_new_inode(inode); 228 return 0; 229 230 fail: 231 iget_failed(inode); 232 jffs2_free_raw_inode(ri); 233 return ret; 234 } 235 236 /***********************************************************************/ 237 238 239 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 240 { 241 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 242 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 243 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 244 int ret; 245 uint32_t now = get_seconds(); 246 247 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 248 dentry->d_name.len, dead_f, now); 249 if (dead_f->inocache) 250 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; 251 if (!ret) 252 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 253 return ret; 254 } 255 /***********************************************************************/ 256 257 258 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 259 { 260 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 261 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 262 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 263 int ret; 264 uint8_t type; 265 uint32_t now; 266 267 /* Don't let people make hard links to bad inodes. */ 268 if (!f->inocache) 269 return -EIO; 270 271 if (S_ISDIR(old_dentry->d_inode->i_mode)) 272 return -EPERM; 273 274 /* XXX: This is ugly */ 275 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 276 if (!type) type = DT_REG; 277 278 now = get_seconds(); 279 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 280 281 if (!ret) { 282 mutex_lock(&f->sem); 283 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; 284 mutex_unlock(&f->sem); 285 d_instantiate(dentry, old_dentry->d_inode); 286 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 287 ihold(old_dentry->d_inode); 288 } 289 return ret; 290 } 291 292 /***********************************************************************/ 293 294 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 295 { 296 struct jffs2_inode_info *f, *dir_f; 297 struct jffs2_sb_info *c; 298 struct inode *inode; 299 struct jffs2_raw_inode *ri; 300 struct jffs2_raw_dirent *rd; 301 struct jffs2_full_dnode *fn; 302 struct jffs2_full_dirent *fd; 303 int namelen; 304 uint32_t alloclen; 305 int ret, targetlen = strlen(target); 306 307 /* FIXME: If you care. We'd need to use frags for the target 308 if it grows much more than this */ 309 if (targetlen > 254) 310 return -ENAMETOOLONG; 311 312 ri = jffs2_alloc_raw_inode(); 313 314 if (!ri) 315 return -ENOMEM; 316 317 c = JFFS2_SB_INFO(dir_i->i_sb); 318 319 /* Try to reserve enough space for both node and dirent. 320 * Just the node will do for now, though 321 */ 322 namelen = dentry->d_name.len; 323 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 324 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 325 326 if (ret) { 327 jffs2_free_raw_inode(ri); 328 return ret; 329 } 330 331 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 332 333 if (IS_ERR(inode)) { 334 jffs2_free_raw_inode(ri); 335 jffs2_complete_reservation(c); 336 return PTR_ERR(inode); 337 } 338 339 inode->i_op = &jffs2_symlink_inode_operations; 340 341 f = JFFS2_INODE_INFO(inode); 342 343 inode->i_size = targetlen; 344 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 345 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 346 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 347 348 ri->compr = JFFS2_COMPR_NONE; 349 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 350 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 351 352 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 353 354 jffs2_free_raw_inode(ri); 355 356 if (IS_ERR(fn)) { 357 /* Eeek. Wave bye bye */ 358 mutex_unlock(&f->sem); 359 jffs2_complete_reservation(c); 360 ret = PTR_ERR(fn); 361 goto fail; 362 } 363 364 /* We use f->target field to store the target path. */ 365 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 366 if (!f->target) { 367 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 368 mutex_unlock(&f->sem); 369 jffs2_complete_reservation(c); 370 ret = -ENOMEM; 371 goto fail; 372 } 373 374 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 375 376 /* No data here. Only a metadata node, which will be 377 obsoleted by the first data write 378 */ 379 f->metadata = fn; 380 mutex_unlock(&f->sem); 381 382 jffs2_complete_reservation(c); 383 384 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 385 if (ret) 386 goto fail; 387 388 ret = jffs2_init_acl_post(inode); 389 if (ret) 390 goto fail; 391 392 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 393 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 394 if (ret) 395 goto fail; 396 397 rd = jffs2_alloc_raw_dirent(); 398 if (!rd) { 399 /* Argh. Now we treat it like a normal delete */ 400 jffs2_complete_reservation(c); 401 ret = -ENOMEM; 402 goto fail; 403 } 404 405 dir_f = JFFS2_INODE_INFO(dir_i); 406 mutex_lock(&dir_f->sem); 407 408 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 409 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 410 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 411 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 412 413 rd->pino = cpu_to_je32(dir_i->i_ino); 414 rd->version = cpu_to_je32(++dir_f->highest_version); 415 rd->ino = cpu_to_je32(inode->i_ino); 416 rd->mctime = cpu_to_je32(get_seconds()); 417 rd->nsize = namelen; 418 rd->type = DT_LNK; 419 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 420 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 421 422 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 423 424 if (IS_ERR(fd)) { 425 /* dirent failed to write. Delete the inode normally 426 as if it were the final unlink() */ 427 jffs2_complete_reservation(c); 428 jffs2_free_raw_dirent(rd); 429 mutex_unlock(&dir_f->sem); 430 ret = PTR_ERR(fd); 431 goto fail; 432 } 433 434 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 435 436 jffs2_free_raw_dirent(rd); 437 438 /* Link the fd into the inode's list, obsoleting an old 439 one if necessary. */ 440 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 441 442 mutex_unlock(&dir_f->sem); 443 jffs2_complete_reservation(c); 444 445 d_instantiate(dentry, inode); 446 unlock_new_inode(inode); 447 return 0; 448 449 fail: 450 iget_failed(inode); 451 return ret; 452 } 453 454 455 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 456 { 457 struct jffs2_inode_info *f, *dir_f; 458 struct jffs2_sb_info *c; 459 struct inode *inode; 460 struct jffs2_raw_inode *ri; 461 struct jffs2_raw_dirent *rd; 462 struct jffs2_full_dnode *fn; 463 struct jffs2_full_dirent *fd; 464 int namelen; 465 uint32_t alloclen; 466 int ret; 467 468 mode |= S_IFDIR; 469 470 ri = jffs2_alloc_raw_inode(); 471 if (!ri) 472 return -ENOMEM; 473 474 c = JFFS2_SB_INFO(dir_i->i_sb); 475 476 /* Try to reserve enough space for both node and dirent. 477 * Just the node will do for now, though 478 */ 479 namelen = dentry->d_name.len; 480 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 481 JFFS2_SUMMARY_INODE_SIZE); 482 483 if (ret) { 484 jffs2_free_raw_inode(ri); 485 return ret; 486 } 487 488 inode = jffs2_new_inode(dir_i, mode, ri); 489 490 if (IS_ERR(inode)) { 491 jffs2_free_raw_inode(ri); 492 jffs2_complete_reservation(c); 493 return PTR_ERR(inode); 494 } 495 496 inode->i_op = &jffs2_dir_inode_operations; 497 inode->i_fop = &jffs2_dir_operations; 498 499 f = JFFS2_INODE_INFO(inode); 500 501 /* Directories get nlink 2 at start */ 502 inode->i_nlink = 2; 503 /* but ic->pino_nlink is the parent ino# */ 504 f->inocache->pino_nlink = dir_i->i_ino; 505 506 ri->data_crc = cpu_to_je32(0); 507 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 508 509 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 510 511 jffs2_free_raw_inode(ri); 512 513 if (IS_ERR(fn)) { 514 /* Eeek. Wave bye bye */ 515 mutex_unlock(&f->sem); 516 jffs2_complete_reservation(c); 517 ret = PTR_ERR(fn); 518 goto fail; 519 } 520 /* No data here. Only a metadata node, which will be 521 obsoleted by the first data write 522 */ 523 f->metadata = fn; 524 mutex_unlock(&f->sem); 525 526 jffs2_complete_reservation(c); 527 528 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 529 if (ret) 530 goto fail; 531 532 ret = jffs2_init_acl_post(inode); 533 if (ret) 534 goto fail; 535 536 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 537 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 538 if (ret) 539 goto fail; 540 541 rd = jffs2_alloc_raw_dirent(); 542 if (!rd) { 543 /* Argh. Now we treat it like a normal delete */ 544 jffs2_complete_reservation(c); 545 ret = -ENOMEM; 546 goto fail; 547 } 548 549 dir_f = JFFS2_INODE_INFO(dir_i); 550 mutex_lock(&dir_f->sem); 551 552 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 553 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 554 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 555 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 556 557 rd->pino = cpu_to_je32(dir_i->i_ino); 558 rd->version = cpu_to_je32(++dir_f->highest_version); 559 rd->ino = cpu_to_je32(inode->i_ino); 560 rd->mctime = cpu_to_je32(get_seconds()); 561 rd->nsize = namelen; 562 rd->type = DT_DIR; 563 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 564 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 565 566 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 567 568 if (IS_ERR(fd)) { 569 /* dirent failed to write. Delete the inode normally 570 as if it were the final unlink() */ 571 jffs2_complete_reservation(c); 572 jffs2_free_raw_dirent(rd); 573 mutex_unlock(&dir_f->sem); 574 ret = PTR_ERR(fd); 575 goto fail; 576 } 577 578 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 579 inc_nlink(dir_i); 580 581 jffs2_free_raw_dirent(rd); 582 583 /* Link the fd into the inode's list, obsoleting an old 584 one if necessary. */ 585 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 586 587 mutex_unlock(&dir_f->sem); 588 jffs2_complete_reservation(c); 589 590 d_instantiate(dentry, inode); 591 unlock_new_inode(inode); 592 return 0; 593 594 fail: 595 iget_failed(inode); 596 return ret; 597 } 598 599 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 600 { 601 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 602 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 603 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 604 struct jffs2_full_dirent *fd; 605 int ret; 606 uint32_t now = get_seconds(); 607 608 for (fd = f->dents ; fd; fd = fd->next) { 609 if (fd->ino) 610 return -ENOTEMPTY; 611 } 612 613 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 614 dentry->d_name.len, f, now); 615 if (!ret) { 616 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 617 clear_nlink(dentry->d_inode); 618 drop_nlink(dir_i); 619 } 620 return ret; 621 } 622 623 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 624 { 625 struct jffs2_inode_info *f, *dir_f; 626 struct jffs2_sb_info *c; 627 struct inode *inode; 628 struct jffs2_raw_inode *ri; 629 struct jffs2_raw_dirent *rd; 630 struct jffs2_full_dnode *fn; 631 struct jffs2_full_dirent *fd; 632 int namelen; 633 union jffs2_device_node dev; 634 int devlen = 0; 635 uint32_t alloclen; 636 int ret; 637 638 if (!new_valid_dev(rdev)) 639 return -EINVAL; 640 641 ri = jffs2_alloc_raw_inode(); 642 if (!ri) 643 return -ENOMEM; 644 645 c = JFFS2_SB_INFO(dir_i->i_sb); 646 647 if (S_ISBLK(mode) || S_ISCHR(mode)) 648 devlen = jffs2_encode_dev(&dev, rdev); 649 650 /* Try to reserve enough space for both node and dirent. 651 * Just the node will do for now, though 652 */ 653 namelen = dentry->d_name.len; 654 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 655 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 656 657 if (ret) { 658 jffs2_free_raw_inode(ri); 659 return ret; 660 } 661 662 inode = jffs2_new_inode(dir_i, mode, ri); 663 664 if (IS_ERR(inode)) { 665 jffs2_free_raw_inode(ri); 666 jffs2_complete_reservation(c); 667 return PTR_ERR(inode); 668 } 669 inode->i_op = &jffs2_file_inode_operations; 670 init_special_inode(inode, inode->i_mode, rdev); 671 672 f = JFFS2_INODE_INFO(inode); 673 674 ri->dsize = ri->csize = cpu_to_je32(devlen); 675 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 676 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 677 678 ri->compr = JFFS2_COMPR_NONE; 679 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 680 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 681 682 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 683 684 jffs2_free_raw_inode(ri); 685 686 if (IS_ERR(fn)) { 687 /* Eeek. Wave bye bye */ 688 mutex_unlock(&f->sem); 689 jffs2_complete_reservation(c); 690 ret = PTR_ERR(fn); 691 goto fail; 692 } 693 /* No data here. Only a metadata node, which will be 694 obsoleted by the first data write 695 */ 696 f->metadata = fn; 697 mutex_unlock(&f->sem); 698 699 jffs2_complete_reservation(c); 700 701 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 702 if (ret) 703 goto fail; 704 705 ret = jffs2_init_acl_post(inode); 706 if (ret) 707 goto fail; 708 709 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 710 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 711 if (ret) 712 goto fail; 713 714 rd = jffs2_alloc_raw_dirent(); 715 if (!rd) { 716 /* Argh. Now we treat it like a normal delete */ 717 jffs2_complete_reservation(c); 718 ret = -ENOMEM; 719 goto fail; 720 } 721 722 dir_f = JFFS2_INODE_INFO(dir_i); 723 mutex_lock(&dir_f->sem); 724 725 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 726 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 727 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 728 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 729 730 rd->pino = cpu_to_je32(dir_i->i_ino); 731 rd->version = cpu_to_je32(++dir_f->highest_version); 732 rd->ino = cpu_to_je32(inode->i_ino); 733 rd->mctime = cpu_to_je32(get_seconds()); 734 rd->nsize = namelen; 735 736 /* XXX: This is ugly. */ 737 rd->type = (mode & S_IFMT) >> 12; 738 739 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 740 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 741 742 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 743 744 if (IS_ERR(fd)) { 745 /* dirent failed to write. Delete the inode normally 746 as if it were the final unlink() */ 747 jffs2_complete_reservation(c); 748 jffs2_free_raw_dirent(rd); 749 mutex_unlock(&dir_f->sem); 750 ret = PTR_ERR(fd); 751 goto fail; 752 } 753 754 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 755 756 jffs2_free_raw_dirent(rd); 757 758 /* Link the fd into the inode's list, obsoleting an old 759 one if necessary. */ 760 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 761 762 mutex_unlock(&dir_f->sem); 763 jffs2_complete_reservation(c); 764 765 d_instantiate(dentry, inode); 766 unlock_new_inode(inode); 767 return 0; 768 769 fail: 770 iget_failed(inode); 771 return ret; 772 } 773 774 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 775 struct inode *new_dir_i, struct dentry *new_dentry) 776 { 777 int ret; 778 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 779 struct jffs2_inode_info *victim_f = NULL; 780 uint8_t type; 781 uint32_t now; 782 783 /* The VFS will check for us and prevent trying to rename a 784 * file over a directory and vice versa, but if it's a directory, 785 * the VFS can't check whether the victim is empty. The filesystem 786 * needs to do that for itself. 787 */ 788 if (new_dentry->d_inode) { 789 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 790 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 791 struct jffs2_full_dirent *fd; 792 793 mutex_lock(&victim_f->sem); 794 for (fd = victim_f->dents; fd; fd = fd->next) { 795 if (fd->ino) { 796 mutex_unlock(&victim_f->sem); 797 return -ENOTEMPTY; 798 } 799 } 800 mutex_unlock(&victim_f->sem); 801 } 802 } 803 804 /* XXX: We probably ought to alloc enough space for 805 both nodes at the same time. Writing the new link, 806 then getting -ENOSPC, is quite bad :) 807 */ 808 809 /* Make a hard link */ 810 811 /* XXX: This is ugly */ 812 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 813 if (!type) type = DT_REG; 814 815 now = get_seconds(); 816 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 817 old_dentry->d_inode->i_ino, type, 818 new_dentry->d_name.name, new_dentry->d_name.len, now); 819 820 if (ret) 821 return ret; 822 823 if (victim_f) { 824 /* There was a victim. Kill it off nicely */ 825 drop_nlink(new_dentry->d_inode); 826 /* Don't oops if the victim was a dirent pointing to an 827 inode which didn't exist. */ 828 if (victim_f->inocache) { 829 mutex_lock(&victim_f->sem); 830 if (S_ISDIR(new_dentry->d_inode->i_mode)) 831 victim_f->inocache->pino_nlink = 0; 832 else 833 victim_f->inocache->pino_nlink--; 834 mutex_unlock(&victim_f->sem); 835 } 836 } 837 838 /* If it was a directory we moved, and there was no victim, 839 increase i_nlink on its new parent */ 840 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 841 inc_nlink(new_dir_i); 842 843 /* Unlink the original */ 844 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 845 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 846 847 /* We don't touch inode->i_nlink */ 848 849 if (ret) { 850 /* Oh shit. We really ought to make a single node which can do both atomically */ 851 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 852 mutex_lock(&f->sem); 853 inc_nlink(old_dentry->d_inode); 854 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 855 f->inocache->pino_nlink++; 856 mutex_unlock(&f->sem); 857 858 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 859 /* Might as well let the VFS know */ 860 d_instantiate(new_dentry, old_dentry->d_inode); 861 ihold(old_dentry->d_inode); 862 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 863 return ret; 864 } 865 866 if (S_ISDIR(old_dentry->d_inode->i_mode)) 867 drop_nlink(old_dir_i); 868 869 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 870 871 return 0; 872 } 873 874