1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 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 */ 11 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/fs.h> 15 #include <linux/crc32.h> 16 #include <linux/jffs2.h> 17 #include "jffs2_fs_i.h" 18 #include "jffs2_fs_sb.h" 19 #include <linux/time.h> 20 #include "nodelist.h" 21 22 static int jffs2_readdir (struct file *, void *, filldir_t); 23 24 static int jffs2_create (struct inode *,struct dentry *,int, 25 struct nameidata *); 26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 27 struct nameidata *); 28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 29 static int jffs2_unlink (struct inode *,struct dentry *); 30 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 31 static int jffs2_mkdir (struct inode *,struct dentry *,int); 32 static int jffs2_rmdir (struct inode *,struct dentry *); 33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 34 static int jffs2_rename (struct inode *, struct dentry *, 35 struct inode *, struct dentry *); 36 37 const struct file_operations jffs2_dir_operations = 38 { 39 .read = generic_read_dir, 40 .readdir = jffs2_readdir, 41 .unlocked_ioctl=jffs2_ioctl, 42 .fsync = jffs2_fsync, 43 .llseek = generic_file_llseek, 44 }; 45 46 47 const struct inode_operations jffs2_dir_inode_operations = 48 { 49 .create = jffs2_create, 50 .lookup = jffs2_lookup, 51 .link = jffs2_link, 52 .unlink = jffs2_unlink, 53 .symlink = jffs2_symlink, 54 .mkdir = jffs2_mkdir, 55 .rmdir = jffs2_rmdir, 56 .mknod = jffs2_mknod, 57 .rename = jffs2_rename, 58 .check_acl = jffs2_check_acl, 59 .setattr = jffs2_setattr, 60 .setxattr = jffs2_setxattr, 61 .getxattr = jffs2_getxattr, 62 .listxattr = jffs2_listxattr, 63 .removexattr = jffs2_removexattr 64 }; 65 66 /***********************************************************************/ 67 68 69 /* We keep the dirent list sorted in increasing order of name hash, 70 and we use the same hash function as the dentries. Makes this 71 nice and simple 72 */ 73 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 74 struct nameidata *nd) 75 { 76 struct jffs2_inode_info *dir_f; 77 struct jffs2_sb_info *c; 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 c = JFFS2_SB_INFO(dir_i->i_sb); 89 90 mutex_lock(&dir_f->sem); 91 92 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 93 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 94 if (fd_list->nhash == target->d_name.hash && 95 (!fd || fd_list->version > fd->version) && 96 strlen(fd_list->name) == target->d_name.len && 97 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 98 fd = fd_list; 99 } 100 } 101 if (fd) 102 ino = fd->ino; 103 mutex_unlock(&dir_f->sem); 104 if (ino) { 105 inode = jffs2_iget(dir_i->i_sb, ino); 106 if (IS_ERR(inode)) { 107 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 108 return ERR_CAST(inode); 109 } 110 } 111 112 return d_splice_alias(inode, target); 113 } 114 115 /***********************************************************************/ 116 117 118 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 119 { 120 struct jffs2_inode_info *f; 121 struct jffs2_sb_info *c; 122 struct inode *inode = filp->f_path.dentry->d_inode; 123 struct jffs2_full_dirent *fd; 124 unsigned long offset, curofs; 125 126 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 127 128 f = JFFS2_INODE_INFO(inode); 129 c = JFFS2_SB_INFO(inode->i_sb); 130 131 offset = filp->f_pos; 132 133 if (offset == 0) { 134 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 135 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 136 goto out; 137 offset++; 138 } 139 if (offset == 1) { 140 unsigned long pino = parent_ino(filp->f_path.dentry); 141 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 142 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 143 goto out; 144 offset++; 145 } 146 147 curofs=1; 148 mutex_lock(&f->sem); 149 for (fd = f->dents; fd; fd = fd->next) { 150 151 curofs++; 152 /* First loop: curofs = 2; offset = 2 */ 153 if (curofs < offset) { 154 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 155 fd->name, fd->ino, fd->type, curofs, offset)); 156 continue; 157 } 158 if (!fd->ino) { 159 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 160 offset++; 161 continue; 162 } 163 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 164 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 165 break; 166 offset++; 167 } 168 mutex_unlock(&f->sem); 169 out: 170 filp->f_pos = offset; 171 return 0; 172 } 173 174 /***********************************************************************/ 175 176 177 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 178 struct nameidata *nd) 179 { 180 struct jffs2_raw_inode *ri; 181 struct jffs2_inode_info *f, *dir_f; 182 struct jffs2_sb_info *c; 183 struct inode *inode; 184 int ret; 185 186 ri = jffs2_alloc_raw_inode(); 187 if (!ri) 188 return -ENOMEM; 189 190 c = JFFS2_SB_INFO(dir_i->i_sb); 191 192 D1(printk(KERN_DEBUG "jffs2_create()\n")); 193 194 inode = jffs2_new_inode(dir_i, mode, ri); 195 196 if (IS_ERR(inode)) { 197 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 198 jffs2_free_raw_inode(ri); 199 return PTR_ERR(inode); 200 } 201 202 inode->i_op = &jffs2_file_inode_operations; 203 inode->i_fop = &jffs2_file_operations; 204 inode->i_mapping->a_ops = &jffs2_file_address_operations; 205 inode->i_mapping->nrpages = 0; 206 207 f = JFFS2_INODE_INFO(inode); 208 dir_f = JFFS2_INODE_INFO(dir_i); 209 210 /* jffs2_do_create() will want to lock it, _after_ reserving 211 space and taking c-alloc_sem. If we keep it locked here, 212 lockdep gets unhappy (although it's a false positive; 213 nothing else will be looking at this inode yet so there's 214 no chance of AB-BA deadlock involving its f->sem). */ 215 mutex_unlock(&f->sem); 216 217 ret = jffs2_do_create(c, dir_f, f, ri, 218 dentry->d_name.name, dentry->d_name.len); 219 if (ret) 220 goto fail; 221 222 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 223 224 jffs2_free_raw_inode(ri); 225 d_instantiate(dentry, inode); 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 return 0; 231 232 fail: 233 make_bad_inode(inode); 234 iput(inode); 235 jffs2_free_raw_inode(ri); 236 return ret; 237 } 238 239 /***********************************************************************/ 240 241 242 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 243 { 244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 247 int ret; 248 uint32_t now = get_seconds(); 249 250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 251 dentry->d_name.len, dead_f, now); 252 if (dead_f->inocache) 253 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; 254 if (!ret) 255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 256 return ret; 257 } 258 /***********************************************************************/ 259 260 261 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 262 { 263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 266 int ret; 267 uint8_t type; 268 uint32_t now; 269 270 /* Don't let people make hard links to bad inodes. */ 271 if (!f->inocache) 272 return -EIO; 273 274 if (S_ISDIR(old_dentry->d_inode->i_mode)) 275 return -EPERM; 276 277 /* XXX: This is ugly */ 278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 279 if (!type) type = DT_REG; 280 281 now = get_seconds(); 282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 283 284 if (!ret) { 285 mutex_lock(&f->sem); 286 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; 287 mutex_unlock(&f->sem); 288 d_instantiate(dentry, old_dentry->d_inode); 289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 290 atomic_inc(&old_dentry->d_inode->i_count); 291 } 292 return ret; 293 } 294 295 /***********************************************************************/ 296 297 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 298 { 299 struct jffs2_inode_info *f, *dir_f; 300 struct jffs2_sb_info *c; 301 struct inode *inode; 302 struct jffs2_raw_inode *ri; 303 struct jffs2_raw_dirent *rd; 304 struct jffs2_full_dnode *fn; 305 struct jffs2_full_dirent *fd; 306 int namelen; 307 uint32_t alloclen; 308 int ret, targetlen = strlen(target); 309 310 /* FIXME: If you care. We'd need to use frags for the target 311 if it grows much more than this */ 312 if (targetlen > 254) 313 return -ENAMETOOLONG; 314 315 ri = jffs2_alloc_raw_inode(); 316 317 if (!ri) 318 return -ENOMEM; 319 320 c = JFFS2_SB_INFO(dir_i->i_sb); 321 322 /* Try to reserve enough space for both node and dirent. 323 * Just the node will do for now, though 324 */ 325 namelen = dentry->d_name.len; 326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 328 329 if (ret) { 330 jffs2_free_raw_inode(ri); 331 return ret; 332 } 333 334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 335 336 if (IS_ERR(inode)) { 337 jffs2_free_raw_inode(ri); 338 jffs2_complete_reservation(c); 339 return PTR_ERR(inode); 340 } 341 342 inode->i_op = &jffs2_symlink_inode_operations; 343 344 f = JFFS2_INODE_INFO(inode); 345 346 inode->i_size = targetlen; 347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 350 351 ri->compr = JFFS2_COMPR_NONE; 352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 354 355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 356 357 jffs2_free_raw_inode(ri); 358 359 if (IS_ERR(fn)) { 360 /* Eeek. Wave bye bye */ 361 mutex_unlock(&f->sem); 362 jffs2_complete_reservation(c); 363 jffs2_clear_inode(inode); 364 return PTR_ERR(fn); 365 } 366 367 /* We use f->target field to store the target path. */ 368 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 369 if (!f->target) { 370 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 371 mutex_unlock(&f->sem); 372 jffs2_complete_reservation(c); 373 jffs2_clear_inode(inode); 374 return -ENOMEM; 375 } 376 377 memcpy(f->target, target, targetlen + 1); 378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 379 380 /* No data here. Only a metadata node, which will be 381 obsoleted by the first data write 382 */ 383 f->metadata = fn; 384 mutex_unlock(&f->sem); 385 386 jffs2_complete_reservation(c); 387 388 ret = jffs2_init_security(inode, dir_i); 389 if (ret) { 390 jffs2_clear_inode(inode); 391 return ret; 392 } 393 ret = jffs2_init_acl_post(inode); 394 if (ret) { 395 jffs2_clear_inode(inode); 396 return ret; 397 } 398 399 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 400 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 401 if (ret) { 402 /* Eep. */ 403 jffs2_clear_inode(inode); 404 return ret; 405 } 406 407 rd = jffs2_alloc_raw_dirent(); 408 if (!rd) { 409 /* Argh. Now we treat it like a normal delete */ 410 jffs2_complete_reservation(c); 411 jffs2_clear_inode(inode); 412 return -ENOMEM; 413 } 414 415 dir_f = JFFS2_INODE_INFO(dir_i); 416 mutex_lock(&dir_f->sem); 417 418 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 419 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 420 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 421 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 422 423 rd->pino = cpu_to_je32(dir_i->i_ino); 424 rd->version = cpu_to_je32(++dir_f->highest_version); 425 rd->ino = cpu_to_je32(inode->i_ino); 426 rd->mctime = cpu_to_je32(get_seconds()); 427 rd->nsize = namelen; 428 rd->type = DT_LNK; 429 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 430 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 431 432 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 433 434 if (IS_ERR(fd)) { 435 /* dirent failed to write. Delete the inode normally 436 as if it were the final unlink() */ 437 jffs2_complete_reservation(c); 438 jffs2_free_raw_dirent(rd); 439 mutex_unlock(&dir_f->sem); 440 jffs2_clear_inode(inode); 441 return PTR_ERR(fd); 442 } 443 444 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 445 446 jffs2_free_raw_dirent(rd); 447 448 /* Link the fd into the inode's list, obsoleting an old 449 one if necessary. */ 450 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 451 452 mutex_unlock(&dir_f->sem); 453 jffs2_complete_reservation(c); 454 455 d_instantiate(dentry, inode); 456 return 0; 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 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 mutex_unlock(&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_post(inode); 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 mutex_lock(&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 mutex_unlock(&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 mutex_unlock(&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_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 608 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 609 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 610 struct jffs2_full_dirent *fd; 611 int ret; 612 uint32_t now = get_seconds(); 613 614 for (fd = f->dents ; fd; fd = fd->next) { 615 if (fd->ino) 616 return -ENOTEMPTY; 617 } 618 619 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 620 dentry->d_name.len, f, now); 621 if (!ret) { 622 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 623 clear_nlink(dentry->d_inode); 624 drop_nlink(dir_i); 625 } 626 return ret; 627 } 628 629 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 630 { 631 struct jffs2_inode_info *f, *dir_f; 632 struct jffs2_sb_info *c; 633 struct inode *inode; 634 struct jffs2_raw_inode *ri; 635 struct jffs2_raw_dirent *rd; 636 struct jffs2_full_dnode *fn; 637 struct jffs2_full_dirent *fd; 638 int namelen; 639 union jffs2_device_node dev; 640 int devlen = 0; 641 uint32_t alloclen; 642 int ret; 643 644 if (!new_valid_dev(rdev)) 645 return -EINVAL; 646 647 ri = jffs2_alloc_raw_inode(); 648 if (!ri) 649 return -ENOMEM; 650 651 c = JFFS2_SB_INFO(dir_i->i_sb); 652 653 if (S_ISBLK(mode) || S_ISCHR(mode)) 654 devlen = jffs2_encode_dev(&dev, rdev); 655 656 /* Try to reserve enough space for both node and dirent. 657 * Just the node will do for now, though 658 */ 659 namelen = dentry->d_name.len; 660 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 661 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 662 663 if (ret) { 664 jffs2_free_raw_inode(ri); 665 return ret; 666 } 667 668 inode = jffs2_new_inode(dir_i, mode, ri); 669 670 if (IS_ERR(inode)) { 671 jffs2_free_raw_inode(ri); 672 jffs2_complete_reservation(c); 673 return PTR_ERR(inode); 674 } 675 inode->i_op = &jffs2_file_inode_operations; 676 init_special_inode(inode, inode->i_mode, rdev); 677 678 f = JFFS2_INODE_INFO(inode); 679 680 ri->dsize = ri->csize = cpu_to_je32(devlen); 681 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 682 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 683 684 ri->compr = JFFS2_COMPR_NONE; 685 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 686 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 687 688 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 689 690 jffs2_free_raw_inode(ri); 691 692 if (IS_ERR(fn)) { 693 /* Eeek. Wave bye bye */ 694 mutex_unlock(&f->sem); 695 jffs2_complete_reservation(c); 696 jffs2_clear_inode(inode); 697 return PTR_ERR(fn); 698 } 699 /* No data here. Only a metadata node, which will be 700 obsoleted by the first data write 701 */ 702 f->metadata = fn; 703 mutex_unlock(&f->sem); 704 705 jffs2_complete_reservation(c); 706 707 ret = jffs2_init_security(inode, dir_i); 708 if (ret) { 709 jffs2_clear_inode(inode); 710 return ret; 711 } 712 ret = jffs2_init_acl_post(inode); 713 if (ret) { 714 jffs2_clear_inode(inode); 715 return ret; 716 } 717 718 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 719 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 720 if (ret) { 721 /* Eep. */ 722 jffs2_clear_inode(inode); 723 return ret; 724 } 725 726 rd = jffs2_alloc_raw_dirent(); 727 if (!rd) { 728 /* Argh. Now we treat it like a normal delete */ 729 jffs2_complete_reservation(c); 730 jffs2_clear_inode(inode); 731 return -ENOMEM; 732 } 733 734 dir_f = JFFS2_INODE_INFO(dir_i); 735 mutex_lock(&dir_f->sem); 736 737 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 738 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 739 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 740 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 741 742 rd->pino = cpu_to_je32(dir_i->i_ino); 743 rd->version = cpu_to_je32(++dir_f->highest_version); 744 rd->ino = cpu_to_je32(inode->i_ino); 745 rd->mctime = cpu_to_je32(get_seconds()); 746 rd->nsize = namelen; 747 748 /* XXX: This is ugly. */ 749 rd->type = (mode & S_IFMT) >> 12; 750 751 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 752 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 753 754 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 755 756 if (IS_ERR(fd)) { 757 /* dirent failed to write. Delete the inode normally 758 as if it were the final unlink() */ 759 jffs2_complete_reservation(c); 760 jffs2_free_raw_dirent(rd); 761 mutex_unlock(&dir_f->sem); 762 jffs2_clear_inode(inode); 763 return PTR_ERR(fd); 764 } 765 766 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 767 768 jffs2_free_raw_dirent(rd); 769 770 /* Link the fd into the inode's list, obsoleting an old 771 one if necessary. */ 772 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 773 774 mutex_unlock(&dir_f->sem); 775 jffs2_complete_reservation(c); 776 777 d_instantiate(dentry, inode); 778 779 return 0; 780 } 781 782 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 783 struct inode *new_dir_i, struct dentry *new_dentry) 784 { 785 int ret; 786 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 787 struct jffs2_inode_info *victim_f = NULL; 788 uint8_t type; 789 uint32_t now; 790 791 /* The VFS will check for us and prevent trying to rename a 792 * file over a directory and vice versa, but if it's a directory, 793 * the VFS can't check whether the victim is empty. The filesystem 794 * needs to do that for itself. 795 */ 796 if (new_dentry->d_inode) { 797 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 798 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 799 struct jffs2_full_dirent *fd; 800 801 mutex_lock(&victim_f->sem); 802 for (fd = victim_f->dents; fd; fd = fd->next) { 803 if (fd->ino) { 804 mutex_unlock(&victim_f->sem); 805 return -ENOTEMPTY; 806 } 807 } 808 mutex_unlock(&victim_f->sem); 809 } 810 } 811 812 /* XXX: We probably ought to alloc enough space for 813 both nodes at the same time. Writing the new link, 814 then getting -ENOSPC, is quite bad :) 815 */ 816 817 /* Make a hard link */ 818 819 /* XXX: This is ugly */ 820 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 821 if (!type) type = DT_REG; 822 823 now = get_seconds(); 824 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 825 old_dentry->d_inode->i_ino, type, 826 new_dentry->d_name.name, new_dentry->d_name.len, now); 827 828 if (ret) 829 return ret; 830 831 if (victim_f) { 832 /* There was a victim. Kill it off nicely */ 833 drop_nlink(new_dentry->d_inode); 834 /* Don't oops if the victim was a dirent pointing to an 835 inode which didn't exist. */ 836 if (victim_f->inocache) { 837 mutex_lock(&victim_f->sem); 838 if (S_ISDIR(new_dentry->d_inode->i_mode)) 839 victim_f->inocache->pino_nlink = 0; 840 else 841 victim_f->inocache->pino_nlink--; 842 mutex_unlock(&victim_f->sem); 843 } 844 } 845 846 /* If it was a directory we moved, and there was no victim, 847 increase i_nlink on its new parent */ 848 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 849 inc_nlink(new_dir_i); 850 851 /* Unlink the original */ 852 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 853 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 854 855 /* We don't touch inode->i_nlink */ 856 857 if (ret) { 858 /* Oh shit. We really ought to make a single node which can do both atomically */ 859 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 860 mutex_lock(&f->sem); 861 inc_nlink(old_dentry->d_inode); 862 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 863 f->inocache->pino_nlink++; 864 mutex_unlock(&f->sem); 865 866 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 867 /* Might as well let the VFS know */ 868 d_instantiate(new_dentry, old_dentry->d_inode); 869 atomic_inc(&old_dentry->d_inode->i_count); 870 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 871 return ret; 872 } 873 874 if (S_ISDIR(old_dentry->d_inode->i_mode)) 875 drop_nlink(old_dir_i); 876 877 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 878 879 return 0; 880 } 881 882