1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2001-2003 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 * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $ 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/fs.h> 17 #include <linux/crc32.h> 18 #include <linux/jffs2.h> 19 #include "jffs2_fs_i.h" 20 #include "jffs2_fs_sb.h" 21 #include <linux/time.h> 22 #include "nodelist.h" 23 24 static int jffs2_readdir (struct file *, void *, filldir_t); 25 26 static int jffs2_create (struct inode *,struct dentry *,int, 27 struct nameidata *); 28 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 29 struct nameidata *); 30 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 31 static int jffs2_unlink (struct inode *,struct dentry *); 32 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 33 static int jffs2_mkdir (struct inode *,struct dentry *,int); 34 static int jffs2_rmdir (struct inode *,struct dentry *); 35 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 36 static int jffs2_rename (struct inode *, struct dentry *, 37 struct inode *, struct dentry *); 38 39 const struct file_operations jffs2_dir_operations = 40 { 41 .read = generic_read_dir, 42 .readdir = jffs2_readdir, 43 .ioctl = jffs2_ioctl, 44 .fsync = jffs2_fsync 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 .permission = jffs2_permission, 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 down(&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 up(&dir_f->sem); 105 if (ino) { 106 inode = iget(dir_i->i_sb, ino); 107 if (!inode) { 108 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 109 return (ERR_PTR(-EIO)); 110 } 111 } 112 113 d_add(target, inode); 114 115 return NULL; 116 } 117 118 /***********************************************************************/ 119 120 121 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 122 { 123 struct jffs2_inode_info *f; 124 struct jffs2_sb_info *c; 125 struct inode *inode = filp->f_path.dentry->d_inode; 126 struct jffs2_full_dirent *fd; 127 unsigned long offset, curofs; 128 129 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 130 131 f = JFFS2_INODE_INFO(inode); 132 c = JFFS2_SB_INFO(inode->i_sb); 133 134 offset = filp->f_pos; 135 136 if (offset == 0) { 137 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 138 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 139 goto out; 140 offset++; 141 } 142 if (offset == 1) { 143 unsigned long pino = parent_ino(filp->f_path.dentry); 144 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 145 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 146 goto out; 147 offset++; 148 } 149 150 curofs=1; 151 down(&f->sem); 152 for (fd = f->dents; fd; fd = fd->next) { 153 154 curofs++; 155 /* First loop: curofs = 2; offset = 2 */ 156 if (curofs < offset) { 157 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 158 fd->name, fd->ino, fd->type, curofs, offset)); 159 continue; 160 } 161 if (!fd->ino) { 162 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 163 offset++; 164 continue; 165 } 166 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 167 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 168 break; 169 offset++; 170 } 171 up(&f->sem); 172 out: 173 filp->f_pos = offset; 174 return 0; 175 } 176 177 /***********************************************************************/ 178 179 180 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 181 struct nameidata *nd) 182 { 183 struct jffs2_raw_inode *ri; 184 struct jffs2_inode_info *f, *dir_f; 185 struct jffs2_sb_info *c; 186 struct inode *inode; 187 int ret; 188 189 ri = jffs2_alloc_raw_inode(); 190 if (!ri) 191 return -ENOMEM; 192 193 c = JFFS2_SB_INFO(dir_i->i_sb); 194 195 D1(printk(KERN_DEBUG "jffs2_create()\n")); 196 197 inode = jffs2_new_inode(dir_i, mode, ri); 198 199 if (IS_ERR(inode)) { 200 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 201 jffs2_free_raw_inode(ri); 202 return PTR_ERR(inode); 203 } 204 205 inode->i_op = &jffs2_file_inode_operations; 206 inode->i_fop = &jffs2_file_operations; 207 inode->i_mapping->a_ops = &jffs2_file_address_operations; 208 inode->i_mapping->nrpages = 0; 209 210 f = JFFS2_INODE_INFO(inode); 211 dir_f = JFFS2_INODE_INFO(dir_i); 212 213 ret = jffs2_do_create(c, dir_f, f, ri, 214 dentry->d_name.name, dentry->d_name.len); 215 216 if (ret) 217 goto fail; 218 219 ret = jffs2_init_security(inode, dir_i); 220 if (ret) 221 goto fail; 222 ret = jffs2_init_acl(inode, dir_i); 223 if (ret) 224 goto fail; 225 226 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 227 228 jffs2_free_raw_inode(ri); 229 d_instantiate(dentry, inode); 230 231 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 232 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 233 return 0; 234 235 fail: 236 make_bad_inode(inode); 237 iput(inode); 238 jffs2_free_raw_inode(ri); 239 return ret; 240 } 241 242 /***********************************************************************/ 243 244 245 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 246 { 247 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 248 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 249 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 250 int ret; 251 uint32_t now = get_seconds(); 252 253 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 254 dentry->d_name.len, dead_f, now); 255 if (dead_f->inocache) 256 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 257 if (!ret) 258 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 259 return ret; 260 } 261 /***********************************************************************/ 262 263 264 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 265 { 266 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 267 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 268 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 269 int ret; 270 uint8_t type; 271 uint32_t now; 272 273 /* Don't let people make hard links to bad inodes. */ 274 if (!f->inocache) 275 return -EIO; 276 277 if (S_ISDIR(old_dentry->d_inode->i_mode)) 278 return -EPERM; 279 280 /* XXX: This is ugly */ 281 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 282 if (!type) type = DT_REG; 283 284 now = get_seconds(); 285 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 286 287 if (!ret) { 288 down(&f->sem); 289 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 290 up(&f->sem); 291 d_instantiate(dentry, old_dentry->d_inode); 292 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 293 atomic_inc(&old_dentry->d_inode->i_count); 294 } 295 return ret; 296 } 297 298 /***********************************************************************/ 299 300 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 301 { 302 struct jffs2_inode_info *f, *dir_f; 303 struct jffs2_sb_info *c; 304 struct inode *inode; 305 struct jffs2_raw_inode *ri; 306 struct jffs2_raw_dirent *rd; 307 struct jffs2_full_dnode *fn; 308 struct jffs2_full_dirent *fd; 309 int namelen; 310 uint32_t alloclen; 311 int ret, targetlen = strlen(target); 312 313 /* FIXME: If you care. We'd need to use frags for the target 314 if it grows much more than this */ 315 if (targetlen > 254) 316 return -EINVAL; 317 318 ri = jffs2_alloc_raw_inode(); 319 320 if (!ri) 321 return -ENOMEM; 322 323 c = JFFS2_SB_INFO(dir_i->i_sb); 324 325 /* Try to reserve enough space for both node and dirent. 326 * Just the node will do for now, though 327 */ 328 namelen = dentry->d_name.len; 329 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 330 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 331 332 if (ret) { 333 jffs2_free_raw_inode(ri); 334 return ret; 335 } 336 337 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 338 339 if (IS_ERR(inode)) { 340 jffs2_free_raw_inode(ri); 341 jffs2_complete_reservation(c); 342 return PTR_ERR(inode); 343 } 344 345 inode->i_op = &jffs2_symlink_inode_operations; 346 347 f = JFFS2_INODE_INFO(inode); 348 349 inode->i_size = targetlen; 350 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 351 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 352 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 353 354 ri->compr = JFFS2_COMPR_NONE; 355 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 356 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 357 358 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 359 360 jffs2_free_raw_inode(ri); 361 362 if (IS_ERR(fn)) { 363 /* Eeek. Wave bye bye */ 364 up(&f->sem); 365 jffs2_complete_reservation(c); 366 jffs2_clear_inode(inode); 367 return PTR_ERR(fn); 368 } 369 370 /* We use f->target field to store the target path. */ 371 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 372 if (!f->target) { 373 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 374 up(&f->sem); 375 jffs2_complete_reservation(c); 376 jffs2_clear_inode(inode); 377 return -ENOMEM; 378 } 379 380 memcpy(f->target, target, targetlen + 1); 381 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 382 383 /* No data here. Only a metadata node, which will be 384 obsoleted by the first data write 385 */ 386 f->metadata = fn; 387 up(&f->sem); 388 389 jffs2_complete_reservation(c); 390 391 ret = jffs2_init_security(inode, dir_i); 392 if (ret) { 393 jffs2_clear_inode(inode); 394 return ret; 395 } 396 ret = jffs2_init_acl(inode, dir_i); 397 if (ret) { 398 jffs2_clear_inode(inode); 399 return ret; 400 } 401 402 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 403 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 404 if (ret) { 405 /* Eep. */ 406 jffs2_clear_inode(inode); 407 return ret; 408 } 409 410 rd = jffs2_alloc_raw_dirent(); 411 if (!rd) { 412 /* Argh. Now we treat it like a normal delete */ 413 jffs2_complete_reservation(c); 414 jffs2_clear_inode(inode); 415 return -ENOMEM; 416 } 417 418 dir_f = JFFS2_INODE_INFO(dir_i); 419 down(&dir_f->sem); 420 421 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 422 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 423 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 424 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 425 426 rd->pino = cpu_to_je32(dir_i->i_ino); 427 rd->version = cpu_to_je32(++dir_f->highest_version); 428 rd->ino = cpu_to_je32(inode->i_ino); 429 rd->mctime = cpu_to_je32(get_seconds()); 430 rd->nsize = namelen; 431 rd->type = DT_LNK; 432 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 433 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 434 435 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 436 437 if (IS_ERR(fd)) { 438 /* dirent failed to write. Delete the inode normally 439 as if it were the final unlink() */ 440 jffs2_complete_reservation(c); 441 jffs2_free_raw_dirent(rd); 442 up(&dir_f->sem); 443 jffs2_clear_inode(inode); 444 return PTR_ERR(fd); 445 } 446 447 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 448 449 jffs2_free_raw_dirent(rd); 450 451 /* Link the fd into the inode's list, obsoleting an old 452 one if necessary. */ 453 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 454 455 up(&dir_f->sem); 456 jffs2_complete_reservation(c); 457 458 d_instantiate(dentry, inode); 459 return 0; 460 } 461 462 463 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 464 { 465 struct jffs2_inode_info *f, *dir_f; 466 struct jffs2_sb_info *c; 467 struct inode *inode; 468 struct jffs2_raw_inode *ri; 469 struct jffs2_raw_dirent *rd; 470 struct jffs2_full_dnode *fn; 471 struct jffs2_full_dirent *fd; 472 int namelen; 473 uint32_t alloclen; 474 int ret; 475 476 mode |= S_IFDIR; 477 478 ri = jffs2_alloc_raw_inode(); 479 if (!ri) 480 return -ENOMEM; 481 482 c = JFFS2_SB_INFO(dir_i->i_sb); 483 484 /* Try to reserve enough space for both node and dirent. 485 * Just the node will do for now, though 486 */ 487 namelen = dentry->d_name.len; 488 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 489 JFFS2_SUMMARY_INODE_SIZE); 490 491 if (ret) { 492 jffs2_free_raw_inode(ri); 493 return ret; 494 } 495 496 inode = jffs2_new_inode(dir_i, mode, ri); 497 498 if (IS_ERR(inode)) { 499 jffs2_free_raw_inode(ri); 500 jffs2_complete_reservation(c); 501 return PTR_ERR(inode); 502 } 503 504 inode->i_op = &jffs2_dir_inode_operations; 505 inode->i_fop = &jffs2_dir_operations; 506 /* Directories get nlink 2 at start */ 507 inode->i_nlink = 2; 508 509 f = JFFS2_INODE_INFO(inode); 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 up(&f->sem); 521 jffs2_complete_reservation(c); 522 jffs2_clear_inode(inode); 523 return PTR_ERR(fn); 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 up(&f->sem); 530 531 jffs2_complete_reservation(c); 532 533 ret = jffs2_init_security(inode, dir_i); 534 if (ret) { 535 jffs2_clear_inode(inode); 536 return ret; 537 } 538 ret = jffs2_init_acl(inode, dir_i); 539 if (ret) { 540 jffs2_clear_inode(inode); 541 return ret; 542 } 543 544 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 545 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 546 if (ret) { 547 /* Eep. */ 548 jffs2_clear_inode(inode); 549 return ret; 550 } 551 552 rd = jffs2_alloc_raw_dirent(); 553 if (!rd) { 554 /* Argh. Now we treat it like a normal delete */ 555 jffs2_complete_reservation(c); 556 jffs2_clear_inode(inode); 557 return -ENOMEM; 558 } 559 560 dir_f = JFFS2_INODE_INFO(dir_i); 561 down(&dir_f->sem); 562 563 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 564 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 565 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 566 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 567 568 rd->pino = cpu_to_je32(dir_i->i_ino); 569 rd->version = cpu_to_je32(++dir_f->highest_version); 570 rd->ino = cpu_to_je32(inode->i_ino); 571 rd->mctime = cpu_to_je32(get_seconds()); 572 rd->nsize = namelen; 573 rd->type = DT_DIR; 574 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 575 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 576 577 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 578 579 if (IS_ERR(fd)) { 580 /* dirent failed to write. Delete the inode normally 581 as if it were the final unlink() */ 582 jffs2_complete_reservation(c); 583 jffs2_free_raw_dirent(rd); 584 up(&dir_f->sem); 585 jffs2_clear_inode(inode); 586 return PTR_ERR(fd); 587 } 588 589 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 590 inc_nlink(dir_i); 591 592 jffs2_free_raw_dirent(rd); 593 594 /* Link the fd into the inode's list, obsoleting an old 595 one if necessary. */ 596 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 597 598 up(&dir_f->sem); 599 jffs2_complete_reservation(c); 600 601 d_instantiate(dentry, inode); 602 return 0; 603 } 604 605 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 606 { 607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 608 struct jffs2_full_dirent *fd; 609 int ret; 610 611 for (fd = f->dents ; fd; fd = fd->next) { 612 if (fd->ino) 613 return -ENOTEMPTY; 614 } 615 ret = jffs2_unlink(dir_i, dentry); 616 if (!ret) 617 drop_nlink(dir_i); 618 return ret; 619 } 620 621 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 622 { 623 struct jffs2_inode_info *f, *dir_f; 624 struct jffs2_sb_info *c; 625 struct inode *inode; 626 struct jffs2_raw_inode *ri; 627 struct jffs2_raw_dirent *rd; 628 struct jffs2_full_dnode *fn; 629 struct jffs2_full_dirent *fd; 630 int namelen; 631 union jffs2_device_node dev; 632 int devlen = 0; 633 uint32_t alloclen; 634 int ret; 635 636 if (!new_valid_dev(rdev)) 637 return -EINVAL; 638 639 ri = jffs2_alloc_raw_inode(); 640 if (!ri) 641 return -ENOMEM; 642 643 c = JFFS2_SB_INFO(dir_i->i_sb); 644 645 if (S_ISBLK(mode) || S_ISCHR(mode)) 646 devlen = jffs2_encode_dev(&dev, rdev); 647 648 /* Try to reserve enough space for both node and dirent. 649 * Just the node will do for now, though 650 */ 651 namelen = dentry->d_name.len; 652 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 653 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 654 655 if (ret) { 656 jffs2_free_raw_inode(ri); 657 return ret; 658 } 659 660 inode = jffs2_new_inode(dir_i, mode, ri); 661 662 if (IS_ERR(inode)) { 663 jffs2_free_raw_inode(ri); 664 jffs2_complete_reservation(c); 665 return PTR_ERR(inode); 666 } 667 inode->i_op = &jffs2_file_inode_operations; 668 init_special_inode(inode, inode->i_mode, rdev); 669 670 f = JFFS2_INODE_INFO(inode); 671 672 ri->dsize = ri->csize = cpu_to_je32(devlen); 673 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 674 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 675 676 ri->compr = JFFS2_COMPR_NONE; 677 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 678 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 679 680 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 681 682 jffs2_free_raw_inode(ri); 683 684 if (IS_ERR(fn)) { 685 /* Eeek. Wave bye bye */ 686 up(&f->sem); 687 jffs2_complete_reservation(c); 688 jffs2_clear_inode(inode); 689 return PTR_ERR(fn); 690 } 691 /* No data here. Only a metadata node, which will be 692 obsoleted by the first data write 693 */ 694 f->metadata = fn; 695 up(&f->sem); 696 697 jffs2_complete_reservation(c); 698 699 ret = jffs2_init_security(inode, dir_i); 700 if (ret) { 701 jffs2_clear_inode(inode); 702 return ret; 703 } 704 ret = jffs2_init_acl(inode, dir_i); 705 if (ret) { 706 jffs2_clear_inode(inode); 707 return ret; 708 } 709 710 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 711 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 712 if (ret) { 713 /* Eep. */ 714 jffs2_clear_inode(inode); 715 return ret; 716 } 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 jffs2_clear_inode(inode); 723 return -ENOMEM; 724 } 725 726 dir_f = JFFS2_INODE_INFO(dir_i); 727 down(&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 up(&dir_f->sem); 754 jffs2_clear_inode(inode); 755 return PTR_ERR(fd); 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 up(&dir_f->sem); 767 jffs2_complete_reservation(c); 768 769 d_instantiate(dentry, inode); 770 771 return 0; 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 down(&victim_f->sem); 794 for (fd = victim_f->dents; fd; fd = fd->next) { 795 if (fd->ino) { 796 up(&victim_f->sem); 797 return -ENOTEMPTY; 798 } 799 } 800 up(&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 down(&victim_f->sem); 830 victim_f->inocache->nlink--; 831 up(&victim_f->sem); 832 } 833 } 834 835 /* If it was a directory we moved, and there was no victim, 836 increase i_nlink on its new parent */ 837 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 838 inc_nlink(new_dir_i); 839 840 /* Unlink the original */ 841 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 842 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 843 844 /* We don't touch inode->i_nlink */ 845 846 if (ret) { 847 /* Oh shit. We really ought to make a single node which can do both atomically */ 848 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 849 down(&f->sem); 850 inc_nlink(old_dentry->d_inode); 851 if (f->inocache) 852 f->inocache->nlink++; 853 up(&f->sem); 854 855 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 856 /* Might as well let the VFS know */ 857 d_instantiate(new_dentry, old_dentry->d_inode); 858 atomic_inc(&old_dentry->d_inode->i_count); 859 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 860 return ret; 861 } 862 863 if (S_ISDIR(old_dentry->d_inode->i_mode)) 864 drop_nlink(old_dir_i); 865 866 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 867 868 return 0; 869 } 870 871