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 1.89 2005/09/07 08:34:54 havasi Exp $ 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/sched.h> 17 #include <linux/fs.h> 18 #include <linux/crc32.h> 19 #include <linux/jffs2.h> 20 #include <linux/jffs2_fs_i.h> 21 #include <linux/jffs2_fs_sb.h> 22 #include <linux/time.h> 23 #include "nodelist.h" 24 25 static int jffs2_readdir (struct file *, void *, filldir_t); 26 27 static int jffs2_create (struct inode *,struct dentry *,int, 28 struct nameidata *); 29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 30 struct nameidata *); 31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 32 static int jffs2_unlink (struct inode *,struct dentry *); 33 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 34 static int jffs2_mkdir (struct inode *,struct dentry *,int); 35 static int jffs2_rmdir (struct inode *,struct dentry *); 36 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 37 static int jffs2_rename (struct inode *, struct dentry *, 38 struct inode *, struct dentry *); 39 40 struct file_operations jffs2_dir_operations = 41 { 42 .read = generic_read_dir, 43 .readdir = jffs2_readdir, 44 .ioctl = jffs2_ioctl, 45 .fsync = jffs2_fsync 46 }; 47 48 49 struct inode_operations jffs2_dir_inode_operations = 50 { 51 .create = jffs2_create, 52 .lookup = jffs2_lookup, 53 .link = jffs2_link, 54 .unlink = jffs2_unlink, 55 .symlink = jffs2_symlink, 56 .mkdir = jffs2_mkdir, 57 .rmdir = jffs2_rmdir, 58 .mknod = jffs2_mknod, 59 .rename = jffs2_rename, 60 .setattr = jffs2_setattr, 61 }; 62 63 /***********************************************************************/ 64 65 66 /* We keep the dirent list sorted in increasing order of name hash, 67 and we use the same hash function as the dentries. Makes this 68 nice and simple 69 */ 70 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 71 struct nameidata *nd) 72 { 73 struct jffs2_inode_info *dir_f; 74 struct jffs2_sb_info *c; 75 struct jffs2_full_dirent *fd = NULL, *fd_list; 76 uint32_t ino = 0; 77 struct inode *inode = NULL; 78 79 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 80 81 dir_f = JFFS2_INODE_INFO(dir_i); 82 c = JFFS2_SB_INFO(dir_i->i_sb); 83 84 down(&dir_f->sem); 85 86 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 87 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 88 if (fd_list->nhash == target->d_name.hash && 89 (!fd || fd_list->version > fd->version) && 90 strlen(fd_list->name) == target->d_name.len && 91 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 92 fd = fd_list; 93 } 94 } 95 if (fd) 96 ino = fd->ino; 97 up(&dir_f->sem); 98 if (ino) { 99 inode = iget(dir_i->i_sb, ino); 100 if (!inode) { 101 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 102 return (ERR_PTR(-EIO)); 103 } 104 } 105 106 d_add(target, inode); 107 108 return NULL; 109 } 110 111 /***********************************************************************/ 112 113 114 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 115 { 116 struct jffs2_inode_info *f; 117 struct jffs2_sb_info *c; 118 struct inode *inode = filp->f_dentry->d_inode; 119 struct jffs2_full_dirent *fd; 120 unsigned long offset, curofs; 121 122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino)); 123 124 f = JFFS2_INODE_INFO(inode); 125 c = JFFS2_SB_INFO(inode->i_sb); 126 127 offset = filp->f_pos; 128 129 if (offset == 0) { 130 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 131 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 132 goto out; 133 offset++; 134 } 135 if (offset == 1) { 136 unsigned long pino = parent_ino(filp->f_dentry); 137 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 138 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 139 goto out; 140 offset++; 141 } 142 143 curofs=1; 144 down(&f->sem); 145 for (fd = f->dents; fd; fd = fd->next) { 146 147 curofs++; 148 /* First loop: curofs = 2; offset = 2 */ 149 if (curofs < offset) { 150 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 151 fd->name, fd->ino, fd->type, curofs, offset)); 152 continue; 153 } 154 if (!fd->ino) { 155 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 156 offset++; 157 continue; 158 } 159 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 160 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 161 break; 162 offset++; 163 } 164 up(&f->sem); 165 out: 166 filp->f_pos = offset; 167 return 0; 168 } 169 170 /***********************************************************************/ 171 172 173 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 174 struct nameidata *nd) 175 { 176 struct jffs2_raw_inode *ri; 177 struct jffs2_inode_info *f, *dir_f; 178 struct jffs2_sb_info *c; 179 struct inode *inode; 180 int ret; 181 182 ri = jffs2_alloc_raw_inode(); 183 if (!ri) 184 return -ENOMEM; 185 186 c = JFFS2_SB_INFO(dir_i->i_sb); 187 188 D1(printk(KERN_DEBUG "jffs2_create()\n")); 189 190 inode = jffs2_new_inode(dir_i, mode, ri); 191 192 if (IS_ERR(inode)) { 193 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 194 jffs2_free_raw_inode(ri); 195 return PTR_ERR(inode); 196 } 197 198 inode->i_op = &jffs2_file_inode_operations; 199 inode->i_fop = &jffs2_file_operations; 200 inode->i_mapping->a_ops = &jffs2_file_address_operations; 201 inode->i_mapping->nrpages = 0; 202 203 f = JFFS2_INODE_INFO(inode); 204 dir_f = JFFS2_INODE_INFO(dir_i); 205 206 ret = jffs2_do_create(c, dir_f, f, ri, 207 dentry->d_name.name, dentry->d_name.len); 208 209 if (ret) { 210 make_bad_inode(inode); 211 iput(inode); 212 jffs2_free_raw_inode(ri); 213 return ret; 214 } 215 216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 217 218 jffs2_free_raw_inode(ri); 219 d_instantiate(dentry, inode); 220 221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 223 return 0; 224 } 225 226 /***********************************************************************/ 227 228 229 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 230 { 231 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 232 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 233 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 234 int ret; 235 uint32_t now = get_seconds(); 236 237 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 238 dentry->d_name.len, dead_f, now); 239 if (dead_f->inocache) 240 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 241 if (!ret) 242 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 243 return ret; 244 } 245 /***********************************************************************/ 246 247 248 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 249 { 250 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 251 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 252 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 253 int ret; 254 uint8_t type; 255 uint32_t now; 256 257 /* Don't let people make hard links to bad inodes. */ 258 if (!f->inocache) 259 return -EIO; 260 261 if (S_ISDIR(old_dentry->d_inode->i_mode)) 262 return -EPERM; 263 264 /* XXX: This is ugly */ 265 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 266 if (!type) type = DT_REG; 267 268 now = get_seconds(); 269 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 270 271 if (!ret) { 272 down(&f->sem); 273 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 274 up(&f->sem); 275 d_instantiate(dentry, old_dentry->d_inode); 276 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 277 atomic_inc(&old_dentry->d_inode->i_count); 278 } 279 return ret; 280 } 281 282 /***********************************************************************/ 283 284 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 285 { 286 struct jffs2_inode_info *f, *dir_f; 287 struct jffs2_sb_info *c; 288 struct inode *inode; 289 struct jffs2_raw_inode *ri; 290 struct jffs2_raw_dirent *rd; 291 struct jffs2_full_dnode *fn; 292 struct jffs2_full_dirent *fd; 293 int namelen; 294 uint32_t alloclen, phys_ofs; 295 int ret, targetlen = strlen(target); 296 297 /* FIXME: If you care. We'd need to use frags for the target 298 if it grows much more than this */ 299 if (targetlen > 254) 300 return -EINVAL; 301 302 ri = jffs2_alloc_raw_inode(); 303 304 if (!ri) 305 return -ENOMEM; 306 307 c = JFFS2_SB_INFO(dir_i->i_sb); 308 309 /* Try to reserve enough space for both node and dirent. 310 * Just the node will do for now, though 311 */ 312 namelen = dentry->d_name.len; 313 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, 314 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 315 316 if (ret) { 317 jffs2_free_raw_inode(ri); 318 return ret; 319 } 320 321 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 322 323 if (IS_ERR(inode)) { 324 jffs2_free_raw_inode(ri); 325 jffs2_complete_reservation(c); 326 return PTR_ERR(inode); 327 } 328 329 inode->i_op = &jffs2_symlink_inode_operations; 330 331 f = JFFS2_INODE_INFO(inode); 332 333 inode->i_size = targetlen; 334 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 335 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 336 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 337 338 ri->compr = JFFS2_COMPR_NONE; 339 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 340 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 341 342 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL); 343 344 jffs2_free_raw_inode(ri); 345 346 if (IS_ERR(fn)) { 347 /* Eeek. Wave bye bye */ 348 up(&f->sem); 349 jffs2_complete_reservation(c); 350 jffs2_clear_inode(inode); 351 return PTR_ERR(fn); 352 } 353 354 /* We use f->target field to store the target path. */ 355 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 356 if (!f->target) { 357 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 358 up(&f->sem); 359 jffs2_complete_reservation(c); 360 jffs2_clear_inode(inode); 361 return -ENOMEM; 362 } 363 364 memcpy(f->target, target, targetlen + 1); 365 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 366 367 /* No data here. Only a metadata node, which will be 368 obsoleted by the first data write 369 */ 370 f->metadata = fn; 371 up(&f->sem); 372 373 jffs2_complete_reservation(c); 374 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, 375 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 376 if (ret) { 377 /* Eep. */ 378 jffs2_clear_inode(inode); 379 return ret; 380 } 381 382 rd = jffs2_alloc_raw_dirent(); 383 if (!rd) { 384 /* Argh. Now we treat it like a normal delete */ 385 jffs2_complete_reservation(c); 386 jffs2_clear_inode(inode); 387 return -ENOMEM; 388 } 389 390 dir_f = JFFS2_INODE_INFO(dir_i); 391 down(&dir_f->sem); 392 393 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 394 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 395 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 396 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 397 398 rd->pino = cpu_to_je32(dir_i->i_ino); 399 rd->version = cpu_to_je32(++dir_f->highest_version); 400 rd->ino = cpu_to_je32(inode->i_ino); 401 rd->mctime = cpu_to_je32(get_seconds()); 402 rd->nsize = namelen; 403 rd->type = DT_LNK; 404 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 405 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 406 407 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 408 409 if (IS_ERR(fd)) { 410 /* dirent failed to write. Delete the inode normally 411 as if it were the final unlink() */ 412 jffs2_complete_reservation(c); 413 jffs2_free_raw_dirent(rd); 414 up(&dir_f->sem); 415 jffs2_clear_inode(inode); 416 return PTR_ERR(fd); 417 } 418 419 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 420 421 jffs2_free_raw_dirent(rd); 422 423 /* Link the fd into the inode's list, obsoleting an old 424 one if necessary. */ 425 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 426 427 up(&dir_f->sem); 428 jffs2_complete_reservation(c); 429 430 d_instantiate(dentry, inode); 431 return 0; 432 } 433 434 435 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 436 { 437 struct jffs2_inode_info *f, *dir_f; 438 struct jffs2_sb_info *c; 439 struct inode *inode; 440 struct jffs2_raw_inode *ri; 441 struct jffs2_raw_dirent *rd; 442 struct jffs2_full_dnode *fn; 443 struct jffs2_full_dirent *fd; 444 int namelen; 445 uint32_t alloclen, phys_ofs; 446 int ret; 447 448 mode |= S_IFDIR; 449 450 ri = jffs2_alloc_raw_inode(); 451 if (!ri) 452 return -ENOMEM; 453 454 c = JFFS2_SB_INFO(dir_i->i_sb); 455 456 /* Try to reserve enough space for both node and dirent. 457 * Just the node will do for now, though 458 */ 459 namelen = dentry->d_name.len; 460 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL, 461 JFFS2_SUMMARY_INODE_SIZE); 462 463 if (ret) { 464 jffs2_free_raw_inode(ri); 465 return ret; 466 } 467 468 inode = jffs2_new_inode(dir_i, mode, ri); 469 470 if (IS_ERR(inode)) { 471 jffs2_free_raw_inode(ri); 472 jffs2_complete_reservation(c); 473 return PTR_ERR(inode); 474 } 475 476 inode->i_op = &jffs2_dir_inode_operations; 477 inode->i_fop = &jffs2_dir_operations; 478 /* Directories get nlink 2 at start */ 479 inode->i_nlink = 2; 480 481 f = JFFS2_INODE_INFO(inode); 482 483 ri->data_crc = cpu_to_je32(0); 484 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 485 486 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); 487 488 jffs2_free_raw_inode(ri); 489 490 if (IS_ERR(fn)) { 491 /* Eeek. Wave bye bye */ 492 up(&f->sem); 493 jffs2_complete_reservation(c); 494 jffs2_clear_inode(inode); 495 return PTR_ERR(fn); 496 } 497 /* No data here. Only a metadata node, which will be 498 obsoleted by the first data write 499 */ 500 f->metadata = fn; 501 up(&f->sem); 502 503 jffs2_complete_reservation(c); 504 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, 505 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 506 if (ret) { 507 /* Eep. */ 508 jffs2_clear_inode(inode); 509 return ret; 510 } 511 512 rd = jffs2_alloc_raw_dirent(); 513 if (!rd) { 514 /* Argh. Now we treat it like a normal delete */ 515 jffs2_complete_reservation(c); 516 jffs2_clear_inode(inode); 517 return -ENOMEM; 518 } 519 520 dir_f = JFFS2_INODE_INFO(dir_i); 521 down(&dir_f->sem); 522 523 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 524 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 525 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 526 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 527 528 rd->pino = cpu_to_je32(dir_i->i_ino); 529 rd->version = cpu_to_je32(++dir_f->highest_version); 530 rd->ino = cpu_to_je32(inode->i_ino); 531 rd->mctime = cpu_to_je32(get_seconds()); 532 rd->nsize = namelen; 533 rd->type = DT_DIR; 534 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 535 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 536 537 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 538 539 if (IS_ERR(fd)) { 540 /* dirent failed to write. Delete the inode normally 541 as if it were the final unlink() */ 542 jffs2_complete_reservation(c); 543 jffs2_free_raw_dirent(rd); 544 up(&dir_f->sem); 545 jffs2_clear_inode(inode); 546 return PTR_ERR(fd); 547 } 548 549 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 550 dir_i->i_nlink++; 551 552 jffs2_free_raw_dirent(rd); 553 554 /* Link the fd into the inode's list, obsoleting an old 555 one if necessary. */ 556 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 557 558 up(&dir_f->sem); 559 jffs2_complete_reservation(c); 560 561 d_instantiate(dentry, inode); 562 return 0; 563 } 564 565 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 566 { 567 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 568 struct jffs2_full_dirent *fd; 569 int ret; 570 571 for (fd = f->dents ; fd; fd = fd->next) { 572 if (fd->ino) 573 return -ENOTEMPTY; 574 } 575 ret = jffs2_unlink(dir_i, dentry); 576 if (!ret) 577 dir_i->i_nlink--; 578 return ret; 579 } 580 581 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 582 { 583 struct jffs2_inode_info *f, *dir_f; 584 struct jffs2_sb_info *c; 585 struct inode *inode; 586 struct jffs2_raw_inode *ri; 587 struct jffs2_raw_dirent *rd; 588 struct jffs2_full_dnode *fn; 589 struct jffs2_full_dirent *fd; 590 int namelen; 591 jint16_t dev; 592 int devlen = 0; 593 uint32_t alloclen, phys_ofs; 594 int ret; 595 596 if (!old_valid_dev(rdev)) 597 return -EINVAL; 598 599 ri = jffs2_alloc_raw_inode(); 600 if (!ri) 601 return -ENOMEM; 602 603 c = JFFS2_SB_INFO(dir_i->i_sb); 604 605 if (S_ISBLK(mode) || S_ISCHR(mode)) { 606 dev = cpu_to_je16(old_encode_dev(rdev)); 607 devlen = sizeof(dev); 608 } 609 610 /* Try to reserve enough space for both node and dirent. 611 * Just the node will do for now, though 612 */ 613 namelen = dentry->d_name.len; 614 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, 615 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 616 617 if (ret) { 618 jffs2_free_raw_inode(ri); 619 return ret; 620 } 621 622 inode = jffs2_new_inode(dir_i, mode, ri); 623 624 if (IS_ERR(inode)) { 625 jffs2_free_raw_inode(ri); 626 jffs2_complete_reservation(c); 627 return PTR_ERR(inode); 628 } 629 inode->i_op = &jffs2_file_inode_operations; 630 init_special_inode(inode, inode->i_mode, rdev); 631 632 f = JFFS2_INODE_INFO(inode); 633 634 ri->dsize = ri->csize = cpu_to_je32(devlen); 635 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 636 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 637 638 ri->compr = JFFS2_COMPR_NONE; 639 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 640 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 641 642 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); 643 644 jffs2_free_raw_inode(ri); 645 646 if (IS_ERR(fn)) { 647 /* Eeek. Wave bye bye */ 648 up(&f->sem); 649 jffs2_complete_reservation(c); 650 jffs2_clear_inode(inode); 651 return PTR_ERR(fn); 652 } 653 /* No data here. Only a metadata node, which will be 654 obsoleted by the first data write 655 */ 656 f->metadata = fn; 657 up(&f->sem); 658 659 jffs2_complete_reservation(c); 660 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, 661 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 662 if (ret) { 663 /* Eep. */ 664 jffs2_clear_inode(inode); 665 return ret; 666 } 667 668 rd = jffs2_alloc_raw_dirent(); 669 if (!rd) { 670 /* Argh. Now we treat it like a normal delete */ 671 jffs2_complete_reservation(c); 672 jffs2_clear_inode(inode); 673 return -ENOMEM; 674 } 675 676 dir_f = JFFS2_INODE_INFO(dir_i); 677 down(&dir_f->sem); 678 679 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 680 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 681 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 682 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 683 684 rd->pino = cpu_to_je32(dir_i->i_ino); 685 rd->version = cpu_to_je32(++dir_f->highest_version); 686 rd->ino = cpu_to_je32(inode->i_ino); 687 rd->mctime = cpu_to_je32(get_seconds()); 688 rd->nsize = namelen; 689 690 /* XXX: This is ugly. */ 691 rd->type = (mode & S_IFMT) >> 12; 692 693 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 694 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 695 696 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 697 698 if (IS_ERR(fd)) { 699 /* dirent failed to write. Delete the inode normally 700 as if it were the final unlink() */ 701 jffs2_complete_reservation(c); 702 jffs2_free_raw_dirent(rd); 703 up(&dir_f->sem); 704 jffs2_clear_inode(inode); 705 return PTR_ERR(fd); 706 } 707 708 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 709 710 jffs2_free_raw_dirent(rd); 711 712 /* Link the fd into the inode's list, obsoleting an old 713 one if necessary. */ 714 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 715 716 up(&dir_f->sem); 717 jffs2_complete_reservation(c); 718 719 d_instantiate(dentry, inode); 720 721 return 0; 722 } 723 724 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 725 struct inode *new_dir_i, struct dentry *new_dentry) 726 { 727 int ret; 728 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 729 struct jffs2_inode_info *victim_f = NULL; 730 uint8_t type; 731 uint32_t now; 732 733 /* The VFS will check for us and prevent trying to rename a 734 * file over a directory and vice versa, but if it's a directory, 735 * the VFS can't check whether the victim is empty. The filesystem 736 * needs to do that for itself. 737 */ 738 if (new_dentry->d_inode) { 739 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 740 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 741 struct jffs2_full_dirent *fd; 742 743 down(&victim_f->sem); 744 for (fd = victim_f->dents; fd; fd = fd->next) { 745 if (fd->ino) { 746 up(&victim_f->sem); 747 return -ENOTEMPTY; 748 } 749 } 750 up(&victim_f->sem); 751 } 752 } 753 754 /* XXX: We probably ought to alloc enough space for 755 both nodes at the same time. Writing the new link, 756 then getting -ENOSPC, is quite bad :) 757 */ 758 759 /* Make a hard link */ 760 761 /* XXX: This is ugly */ 762 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 763 if (!type) type = DT_REG; 764 765 now = get_seconds(); 766 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 767 old_dentry->d_inode->i_ino, type, 768 new_dentry->d_name.name, new_dentry->d_name.len, now); 769 770 if (ret) 771 return ret; 772 773 if (victim_f) { 774 /* There was a victim. Kill it off nicely */ 775 new_dentry->d_inode->i_nlink--; 776 /* Don't oops if the victim was a dirent pointing to an 777 inode which didn't exist. */ 778 if (victim_f->inocache) { 779 down(&victim_f->sem); 780 victim_f->inocache->nlink--; 781 up(&victim_f->sem); 782 } 783 } 784 785 /* If it was a directory we moved, and there was no victim, 786 increase i_nlink on its new parent */ 787 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 788 new_dir_i->i_nlink++; 789 790 /* Unlink the original */ 791 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 792 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 793 794 /* We don't touch inode->i_nlink */ 795 796 if (ret) { 797 /* Oh shit. We really ought to make a single node which can do both atomically */ 798 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 799 down(&f->sem); 800 old_dentry->d_inode->i_nlink++; 801 if (f->inocache) 802 f->inocache->nlink++; 803 up(&f->sem); 804 805 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 806 /* Might as well let the VFS know */ 807 d_instantiate(new_dentry, old_dentry->d_inode); 808 atomic_inc(&old_dentry->d_inode->i_count); 809 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 810 return ret; 811 } 812 813 if (S_ISDIR(old_dentry->d_inode->i_mode)) 814 old_dir_i->i_nlink--; 815 816 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 817 818 return 0; 819 } 820 821