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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15 #include <linux/kernel.h> 16 #include <linux/slab.h> 17 #include <linux/fs.h> 18 #include <linux/crc32.h> 19 #include <linux/jffs2.h> 20 #include "jffs2_fs_i.h" 21 #include "jffs2_fs_sb.h" 22 #include <linux/time.h> 23 #include "nodelist.h" 24 25 static int jffs2_readdir (struct file *, struct dir_context *); 26 27 static int jffs2_create (struct inode *,struct dentry *,umode_t, 28 bool); 29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 30 unsigned int); 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 *,umode_t); 35 static int jffs2_rmdir (struct inode *,struct dentry *); 36 static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); 37 static int jffs2_rename (struct inode *, struct dentry *, 38 struct inode *, struct dentry *); 39 40 const struct file_operations jffs2_dir_operations = 41 { 42 .read = generic_read_dir, 43 .iterate_shared=jffs2_readdir, 44 .unlocked_ioctl=jffs2_ioctl, 45 .fsync = jffs2_fsync, 46 .llseek = generic_file_llseek, 47 }; 48 49 50 const struct inode_operations jffs2_dir_inode_operations = 51 { 52 .create = jffs2_create, 53 .lookup = jffs2_lookup, 54 .link = jffs2_link, 55 .unlink = jffs2_unlink, 56 .symlink = jffs2_symlink, 57 .mkdir = jffs2_mkdir, 58 .rmdir = jffs2_rmdir, 59 .mknod = jffs2_mknod, 60 .rename = jffs2_rename, 61 .get_acl = jffs2_get_acl, 62 .set_acl = jffs2_set_acl, 63 .setattr = jffs2_setattr, 64 .setxattr = jffs2_setxattr, 65 .getxattr = jffs2_getxattr, 66 .listxattr = jffs2_listxattr, 67 .removexattr = jffs2_removexattr 68 }; 69 70 /***********************************************************************/ 71 72 73 /* We keep the dirent list sorted in increasing order of name hash, 74 and we use the same hash function as the dentries. Makes this 75 nice and simple 76 */ 77 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 78 unsigned int flags) 79 { 80 struct jffs2_inode_info *dir_f; 81 struct jffs2_full_dirent *fd = NULL, *fd_list; 82 uint32_t ino = 0; 83 struct inode *inode = NULL; 84 85 jffs2_dbg(1, "jffs2_lookup()\n"); 86 87 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 88 return ERR_PTR(-ENAMETOOLONG); 89 90 dir_f = JFFS2_INODE_INFO(dir_i); 91 92 mutex_lock(&dir_f->sem); 93 94 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 95 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 96 if (fd_list->nhash == target->d_name.hash && 97 (!fd || fd_list->version > fd->version) && 98 strlen(fd_list->name) == target->d_name.len && 99 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 100 fd = fd_list; 101 } 102 } 103 if (fd) 104 ino = fd->ino; 105 mutex_unlock(&dir_f->sem); 106 if (ino) { 107 inode = jffs2_iget(dir_i->i_sb, ino); 108 if (IS_ERR(inode)) 109 pr_warn("iget() failed for ino #%u\n", ino); 110 } 111 112 return d_splice_alias(inode, target); 113 } 114 115 /***********************************************************************/ 116 117 118 static int jffs2_readdir(struct file *file, struct dir_context *ctx) 119 { 120 struct inode *inode = file_inode(file); 121 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 122 struct jffs2_full_dirent *fd; 123 unsigned long curofs = 1; 124 125 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); 126 127 if (!dir_emit_dots(file, ctx)) 128 return 0; 129 130 mutex_lock(&f->sem); 131 for (fd = f->dents; fd; fd = fd->next) { 132 curofs++; 133 /* First loop: curofs = 2; pos = 2 */ 134 if (curofs < ctx->pos) { 135 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 136 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); 137 continue; 138 } 139 if (!fd->ino) { 140 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 141 fd->name); 142 ctx->pos++; 143 continue; 144 } 145 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 146 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 147 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) 148 break; 149 ctx->pos++; 150 } 151 mutex_unlock(&f->sem); 152 return 0; 153 } 154 155 /***********************************************************************/ 156 157 158 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, 159 umode_t mode, bool excl) 160 { 161 struct jffs2_raw_inode *ri; 162 struct jffs2_inode_info *f, *dir_f; 163 struct jffs2_sb_info *c; 164 struct inode *inode; 165 int ret; 166 167 ri = jffs2_alloc_raw_inode(); 168 if (!ri) 169 return -ENOMEM; 170 171 c = JFFS2_SB_INFO(dir_i->i_sb); 172 173 jffs2_dbg(1, "%s()\n", __func__); 174 175 inode = jffs2_new_inode(dir_i, mode, ri); 176 177 if (IS_ERR(inode)) { 178 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 179 jffs2_free_raw_inode(ri); 180 return PTR_ERR(inode); 181 } 182 183 inode->i_op = &jffs2_file_inode_operations; 184 inode->i_fop = &jffs2_file_operations; 185 inode->i_mapping->a_ops = &jffs2_file_address_operations; 186 inode->i_mapping->nrpages = 0; 187 188 f = JFFS2_INODE_INFO(inode); 189 dir_f = JFFS2_INODE_INFO(dir_i); 190 191 /* jffs2_do_create() will want to lock it, _after_ reserving 192 space and taking c-alloc_sem. If we keep it locked here, 193 lockdep gets unhappy (although it's a false positive; 194 nothing else will be looking at this inode yet so there's 195 no chance of AB-BA deadlock involving its f->sem). */ 196 mutex_unlock(&f->sem); 197 198 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 199 if (ret) 200 goto fail; 201 202 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 203 204 jffs2_free_raw_inode(ri); 205 206 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 207 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 208 f->inocache->pino_nlink, inode->i_mapping->nrpages); 209 210 unlock_new_inode(inode); 211 d_instantiate(dentry, inode); 212 return 0; 213 214 fail: 215 iget_failed(inode); 216 jffs2_free_raw_inode(ri); 217 return ret; 218 } 219 220 /***********************************************************************/ 221 222 223 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 224 { 225 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 226 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 227 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); 228 int ret; 229 uint32_t now = get_seconds(); 230 231 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 232 dentry->d_name.len, dead_f, now); 233 if (dead_f->inocache) 234 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); 235 if (!ret) 236 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 237 return ret; 238 } 239 /***********************************************************************/ 240 241 242 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 243 { 244 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); 245 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 247 int ret; 248 uint8_t type; 249 uint32_t now; 250 251 /* Don't let people make hard links to bad inodes. */ 252 if (!f->inocache) 253 return -EIO; 254 255 if (d_is_dir(old_dentry)) 256 return -EPERM; 257 258 /* XXX: This is ugly */ 259 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 260 if (!type) type = DT_REG; 261 262 now = get_seconds(); 263 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 264 265 if (!ret) { 266 mutex_lock(&f->sem); 267 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); 268 mutex_unlock(&f->sem); 269 d_instantiate(dentry, d_inode(old_dentry)); 270 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 271 ihold(d_inode(old_dentry)); 272 } 273 return ret; 274 } 275 276 /***********************************************************************/ 277 278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 279 { 280 struct jffs2_inode_info *f, *dir_f; 281 struct jffs2_sb_info *c; 282 struct inode *inode; 283 struct jffs2_raw_inode *ri; 284 struct jffs2_raw_dirent *rd; 285 struct jffs2_full_dnode *fn; 286 struct jffs2_full_dirent *fd; 287 int namelen; 288 uint32_t alloclen; 289 int ret, targetlen = strlen(target); 290 291 /* FIXME: If you care. We'd need to use frags for the target 292 if it grows much more than this */ 293 if (targetlen > 254) 294 return -ENAMETOOLONG; 295 296 ri = jffs2_alloc_raw_inode(); 297 298 if (!ri) 299 return -ENOMEM; 300 301 c = JFFS2_SB_INFO(dir_i->i_sb); 302 303 /* Try to reserve enough space for both node and dirent. 304 * Just the node will do for now, though 305 */ 306 namelen = dentry->d_name.len; 307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 308 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 309 310 if (ret) { 311 jffs2_free_raw_inode(ri); 312 return ret; 313 } 314 315 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 316 317 if (IS_ERR(inode)) { 318 jffs2_free_raw_inode(ri); 319 jffs2_complete_reservation(c); 320 return PTR_ERR(inode); 321 } 322 323 inode->i_op = &jffs2_symlink_inode_operations; 324 325 f = JFFS2_INODE_INFO(inode); 326 327 inode->i_size = targetlen; 328 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 329 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 330 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 331 332 ri->compr = JFFS2_COMPR_NONE; 333 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 334 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 335 336 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 337 338 jffs2_free_raw_inode(ri); 339 340 if (IS_ERR(fn)) { 341 /* Eeek. Wave bye bye */ 342 mutex_unlock(&f->sem); 343 jffs2_complete_reservation(c); 344 ret = PTR_ERR(fn); 345 goto fail; 346 } 347 348 /* We use f->target field to store the target path. */ 349 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 350 if (!f->target) { 351 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 352 mutex_unlock(&f->sem); 353 jffs2_complete_reservation(c); 354 ret = -ENOMEM; 355 goto fail; 356 } 357 inode->i_link = f->target; 358 359 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 360 __func__, (char *)f->target); 361 362 /* No data here. Only a metadata node, which will be 363 obsoleted by the first data write 364 */ 365 f->metadata = fn; 366 mutex_unlock(&f->sem); 367 368 jffs2_complete_reservation(c); 369 370 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 371 if (ret) 372 goto fail; 373 374 ret = jffs2_init_acl_post(inode); 375 if (ret) 376 goto fail; 377 378 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 379 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 380 if (ret) 381 goto fail; 382 383 rd = jffs2_alloc_raw_dirent(); 384 if (!rd) { 385 /* Argh. Now we treat it like a normal delete */ 386 jffs2_complete_reservation(c); 387 ret = -ENOMEM; 388 goto fail; 389 } 390 391 dir_f = JFFS2_INODE_INFO(dir_i); 392 mutex_lock(&dir_f->sem); 393 394 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 395 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 396 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 397 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 398 399 rd->pino = cpu_to_je32(dir_i->i_ino); 400 rd->version = cpu_to_je32(++dir_f->highest_version); 401 rd->ino = cpu_to_je32(inode->i_ino); 402 rd->mctime = cpu_to_je32(get_seconds()); 403 rd->nsize = namelen; 404 rd->type = DT_LNK; 405 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 406 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 407 408 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 409 410 if (IS_ERR(fd)) { 411 /* dirent failed to write. Delete the inode normally 412 as if it were the final unlink() */ 413 jffs2_complete_reservation(c); 414 jffs2_free_raw_dirent(rd); 415 mutex_unlock(&dir_f->sem); 416 ret = PTR_ERR(fd); 417 goto fail; 418 } 419 420 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 421 422 jffs2_free_raw_dirent(rd); 423 424 /* Link the fd into the inode's list, obsoleting an old 425 one if necessary. */ 426 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 427 428 mutex_unlock(&dir_f->sem); 429 jffs2_complete_reservation(c); 430 431 unlock_new_inode(inode); 432 d_instantiate(dentry, inode); 433 return 0; 434 435 fail: 436 iget_failed(inode); 437 return ret; 438 } 439 440 441 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) 442 { 443 struct jffs2_inode_info *f, *dir_f; 444 struct jffs2_sb_info *c; 445 struct inode *inode; 446 struct jffs2_raw_inode *ri; 447 struct jffs2_raw_dirent *rd; 448 struct jffs2_full_dnode *fn; 449 struct jffs2_full_dirent *fd; 450 int namelen; 451 uint32_t alloclen; 452 int ret; 453 454 mode |= S_IFDIR; 455 456 ri = jffs2_alloc_raw_inode(); 457 if (!ri) 458 return -ENOMEM; 459 460 c = JFFS2_SB_INFO(dir_i->i_sb); 461 462 /* Try to reserve enough space for both node and dirent. 463 * Just the node will do for now, though 464 */ 465 namelen = dentry->d_name.len; 466 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 467 JFFS2_SUMMARY_INODE_SIZE); 468 469 if (ret) { 470 jffs2_free_raw_inode(ri); 471 return ret; 472 } 473 474 inode = jffs2_new_inode(dir_i, mode, ri); 475 476 if (IS_ERR(inode)) { 477 jffs2_free_raw_inode(ri); 478 jffs2_complete_reservation(c); 479 return PTR_ERR(inode); 480 } 481 482 inode->i_op = &jffs2_dir_inode_operations; 483 inode->i_fop = &jffs2_dir_operations; 484 485 f = JFFS2_INODE_INFO(inode); 486 487 /* Directories get nlink 2 at start */ 488 set_nlink(inode, 2); 489 /* but ic->pino_nlink is the parent ino# */ 490 f->inocache->pino_nlink = dir_i->i_ino; 491 492 ri->data_crc = cpu_to_je32(0); 493 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 494 495 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 496 497 jffs2_free_raw_inode(ri); 498 499 if (IS_ERR(fn)) { 500 /* Eeek. Wave bye bye */ 501 mutex_unlock(&f->sem); 502 jffs2_complete_reservation(c); 503 ret = PTR_ERR(fn); 504 goto fail; 505 } 506 /* No data here. Only a metadata node, which will be 507 obsoleted by the first data write 508 */ 509 f->metadata = fn; 510 mutex_unlock(&f->sem); 511 512 jffs2_complete_reservation(c); 513 514 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 515 if (ret) 516 goto fail; 517 518 ret = jffs2_init_acl_post(inode); 519 if (ret) 520 goto fail; 521 522 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 523 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 524 if (ret) 525 goto fail; 526 527 rd = jffs2_alloc_raw_dirent(); 528 if (!rd) { 529 /* Argh. Now we treat it like a normal delete */ 530 jffs2_complete_reservation(c); 531 ret = -ENOMEM; 532 goto fail; 533 } 534 535 dir_f = JFFS2_INODE_INFO(dir_i); 536 mutex_lock(&dir_f->sem); 537 538 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 539 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 540 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 541 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 542 543 rd->pino = cpu_to_je32(dir_i->i_ino); 544 rd->version = cpu_to_je32(++dir_f->highest_version); 545 rd->ino = cpu_to_je32(inode->i_ino); 546 rd->mctime = cpu_to_je32(get_seconds()); 547 rd->nsize = namelen; 548 rd->type = DT_DIR; 549 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 550 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 551 552 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 553 554 if (IS_ERR(fd)) { 555 /* dirent failed to write. Delete the inode normally 556 as if it were the final unlink() */ 557 jffs2_complete_reservation(c); 558 jffs2_free_raw_dirent(rd); 559 mutex_unlock(&dir_f->sem); 560 ret = PTR_ERR(fd); 561 goto fail; 562 } 563 564 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 565 inc_nlink(dir_i); 566 567 jffs2_free_raw_dirent(rd); 568 569 /* Link the fd into the inode's list, obsoleting an old 570 one if necessary. */ 571 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 572 573 mutex_unlock(&dir_f->sem); 574 jffs2_complete_reservation(c); 575 576 unlock_new_inode(inode); 577 d_instantiate(dentry, inode); 578 return 0; 579 580 fail: 581 iget_failed(inode); 582 return ret; 583 } 584 585 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 586 { 587 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 588 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 589 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); 590 struct jffs2_full_dirent *fd; 591 int ret; 592 uint32_t now = get_seconds(); 593 594 for (fd = f->dents ; fd; fd = fd->next) { 595 if (fd->ino) 596 return -ENOTEMPTY; 597 } 598 599 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 600 dentry->d_name.len, f, now); 601 if (!ret) { 602 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 603 clear_nlink(d_inode(dentry)); 604 drop_nlink(dir_i); 605 } 606 return ret; 607 } 608 609 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) 610 { 611 struct jffs2_inode_info *f, *dir_f; 612 struct jffs2_sb_info *c; 613 struct inode *inode; 614 struct jffs2_raw_inode *ri; 615 struct jffs2_raw_dirent *rd; 616 struct jffs2_full_dnode *fn; 617 struct jffs2_full_dirent *fd; 618 int namelen; 619 union jffs2_device_node dev; 620 int devlen = 0; 621 uint32_t alloclen; 622 int ret; 623 624 ri = jffs2_alloc_raw_inode(); 625 if (!ri) 626 return -ENOMEM; 627 628 c = JFFS2_SB_INFO(dir_i->i_sb); 629 630 if (S_ISBLK(mode) || S_ISCHR(mode)) 631 devlen = jffs2_encode_dev(&dev, rdev); 632 633 /* Try to reserve enough space for both node and dirent. 634 * Just the node will do for now, though 635 */ 636 namelen = dentry->d_name.len; 637 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 638 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 639 640 if (ret) { 641 jffs2_free_raw_inode(ri); 642 return ret; 643 } 644 645 inode = jffs2_new_inode(dir_i, mode, ri); 646 647 if (IS_ERR(inode)) { 648 jffs2_free_raw_inode(ri); 649 jffs2_complete_reservation(c); 650 return PTR_ERR(inode); 651 } 652 inode->i_op = &jffs2_file_inode_operations; 653 init_special_inode(inode, inode->i_mode, rdev); 654 655 f = JFFS2_INODE_INFO(inode); 656 657 ri->dsize = ri->csize = cpu_to_je32(devlen); 658 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 659 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 660 661 ri->compr = JFFS2_COMPR_NONE; 662 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 663 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 664 665 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 666 667 jffs2_free_raw_inode(ri); 668 669 if (IS_ERR(fn)) { 670 /* Eeek. Wave bye bye */ 671 mutex_unlock(&f->sem); 672 jffs2_complete_reservation(c); 673 ret = PTR_ERR(fn); 674 goto fail; 675 } 676 /* No data here. Only a metadata node, which will be 677 obsoleted by the first data write 678 */ 679 f->metadata = fn; 680 mutex_unlock(&f->sem); 681 682 jffs2_complete_reservation(c); 683 684 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 685 if (ret) 686 goto fail; 687 688 ret = jffs2_init_acl_post(inode); 689 if (ret) 690 goto fail; 691 692 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 693 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 694 if (ret) 695 goto fail; 696 697 rd = jffs2_alloc_raw_dirent(); 698 if (!rd) { 699 /* Argh. Now we treat it like a normal delete */ 700 jffs2_complete_reservation(c); 701 ret = -ENOMEM; 702 goto fail; 703 } 704 705 dir_f = JFFS2_INODE_INFO(dir_i); 706 mutex_lock(&dir_f->sem); 707 708 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 709 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 710 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 711 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 712 713 rd->pino = cpu_to_je32(dir_i->i_ino); 714 rd->version = cpu_to_je32(++dir_f->highest_version); 715 rd->ino = cpu_to_je32(inode->i_ino); 716 rd->mctime = cpu_to_je32(get_seconds()); 717 rd->nsize = namelen; 718 719 /* XXX: This is ugly. */ 720 rd->type = (mode & S_IFMT) >> 12; 721 722 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 723 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 724 725 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 726 727 if (IS_ERR(fd)) { 728 /* dirent failed to write. Delete the inode normally 729 as if it were the final unlink() */ 730 jffs2_complete_reservation(c); 731 jffs2_free_raw_dirent(rd); 732 mutex_unlock(&dir_f->sem); 733 ret = PTR_ERR(fd); 734 goto fail; 735 } 736 737 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 738 739 jffs2_free_raw_dirent(rd); 740 741 /* Link the fd into the inode's list, obsoleting an old 742 one if necessary. */ 743 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 744 745 mutex_unlock(&dir_f->sem); 746 jffs2_complete_reservation(c); 747 748 unlock_new_inode(inode); 749 d_instantiate(dentry, inode); 750 return 0; 751 752 fail: 753 iget_failed(inode); 754 return ret; 755 } 756 757 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 758 struct inode *new_dir_i, struct dentry *new_dentry) 759 { 760 int ret; 761 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 762 struct jffs2_inode_info *victim_f = NULL; 763 uint8_t type; 764 uint32_t now; 765 766 /* The VFS will check for us and prevent trying to rename a 767 * file over a directory and vice versa, but if it's a directory, 768 * the VFS can't check whether the victim is empty. The filesystem 769 * needs to do that for itself. 770 */ 771 if (d_really_is_positive(new_dentry)) { 772 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); 773 if (d_is_dir(new_dentry)) { 774 struct jffs2_full_dirent *fd; 775 776 mutex_lock(&victim_f->sem); 777 for (fd = victim_f->dents; fd; fd = fd->next) { 778 if (fd->ino) { 779 mutex_unlock(&victim_f->sem); 780 return -ENOTEMPTY; 781 } 782 } 783 mutex_unlock(&victim_f->sem); 784 } 785 } 786 787 /* XXX: We probably ought to alloc enough space for 788 both nodes at the same time. Writing the new link, 789 then getting -ENOSPC, is quite bad :) 790 */ 791 792 /* Make a hard link */ 793 794 /* XXX: This is ugly */ 795 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 796 if (!type) type = DT_REG; 797 798 now = get_seconds(); 799 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 800 d_inode(old_dentry)->i_ino, type, 801 new_dentry->d_name.name, new_dentry->d_name.len, now); 802 803 if (ret) 804 return ret; 805 806 if (victim_f) { 807 /* There was a victim. Kill it off nicely */ 808 if (d_is_dir(new_dentry)) 809 clear_nlink(d_inode(new_dentry)); 810 else 811 drop_nlink(d_inode(new_dentry)); 812 /* Don't oops if the victim was a dirent pointing to an 813 inode which didn't exist. */ 814 if (victim_f->inocache) { 815 mutex_lock(&victim_f->sem); 816 if (d_is_dir(new_dentry)) 817 victim_f->inocache->pino_nlink = 0; 818 else 819 victim_f->inocache->pino_nlink--; 820 mutex_unlock(&victim_f->sem); 821 } 822 } 823 824 /* If it was a directory we moved, and there was no victim, 825 increase i_nlink on its new parent */ 826 if (d_is_dir(old_dentry) && !victim_f) 827 inc_nlink(new_dir_i); 828 829 /* Unlink the original */ 830 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 831 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 832 833 /* We don't touch inode->i_nlink */ 834 835 if (ret) { 836 /* Oh shit. We really ought to make a single node which can do both atomically */ 837 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 838 mutex_lock(&f->sem); 839 inc_nlink(d_inode(old_dentry)); 840 if (f->inocache && !d_is_dir(old_dentry)) 841 f->inocache->pino_nlink++; 842 mutex_unlock(&f->sem); 843 844 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 845 __func__, ret); 846 /* 847 * We can't keep the target in dcache after that. 848 * For one thing, we can't afford dentry aliases for directories. 849 * For another, if there was a victim, we _can't_ set new inode 850 * for that sucker and we have to trigger mount eviction - the 851 * caller won't do it on its own since we are returning an error. 852 */ 853 d_invalidate(new_dentry); 854 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 855 return ret; 856 } 857 858 if (d_is_dir(old_dentry)) 859 drop_nlink(old_dir_i); 860 861 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 862 863 return 0; 864 } 865 866