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 unsigned int); 40 41 const struct file_operations jffs2_dir_operations = 42 { 43 .read = generic_read_dir, 44 .iterate_shared=jffs2_readdir, 45 .unlocked_ioctl=jffs2_ioctl, 46 .fsync = jffs2_fsync, 47 .llseek = generic_file_llseek, 48 }; 49 50 51 const struct inode_operations jffs2_dir_inode_operations = 52 { 53 .create = jffs2_create, 54 .lookup = jffs2_lookup, 55 .link = jffs2_link, 56 .unlink = jffs2_unlink, 57 .symlink = jffs2_symlink, 58 .mkdir = jffs2_mkdir, 59 .rmdir = jffs2_rmdir, 60 .mknod = jffs2_mknod, 61 .rename = jffs2_rename, 62 .get_acl = jffs2_get_acl, 63 .set_acl = jffs2_set_acl, 64 .setattr = jffs2_setattr, 65 .listxattr = jffs2_listxattr, 66 }; 67 68 /***********************************************************************/ 69 70 71 /* We keep the dirent list sorted in increasing order of name hash, 72 and we use the same hash function as the dentries. Makes this 73 nice and simple 74 */ 75 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 76 unsigned int flags) 77 { 78 struct jffs2_inode_info *dir_f; 79 struct jffs2_full_dirent *fd = NULL, *fd_list; 80 uint32_t ino = 0; 81 struct inode *inode = NULL; 82 unsigned int nhash; 83 84 jffs2_dbg(1, "jffs2_lookup()\n"); 85 86 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 87 return ERR_PTR(-ENAMETOOLONG); 88 89 dir_f = JFFS2_INODE_INFO(dir_i); 90 91 /* The 'nhash' on the fd_list is not the same as the dentry hash */ 92 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); 93 94 mutex_lock(&dir_f->sem); 95 96 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 97 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { 98 if (fd_list->nhash == nhash && 99 (!fd || fd_list->version > fd->version) && 100 strlen(fd_list->name) == target->d_name.len && 101 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 102 fd = fd_list; 103 } 104 } 105 if (fd) 106 ino = fd->ino; 107 mutex_unlock(&dir_f->sem); 108 if (ino) { 109 inode = jffs2_iget(dir_i->i_sb, ino); 110 if (IS_ERR(inode)) 111 pr_warn("iget() failed for ino #%u\n", ino); 112 } 113 114 return d_splice_alias(inode, target); 115 } 116 117 /***********************************************************************/ 118 119 120 static int jffs2_readdir(struct file *file, struct dir_context *ctx) 121 { 122 struct inode *inode = file_inode(file); 123 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 124 struct jffs2_full_dirent *fd; 125 unsigned long curofs = 1; 126 127 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); 128 129 if (!dir_emit_dots(file, ctx)) 130 return 0; 131 132 mutex_lock(&f->sem); 133 for (fd = f->dents; fd; fd = fd->next) { 134 curofs++; 135 /* First loop: curofs = 2; pos = 2 */ 136 if (curofs < ctx->pos) { 137 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 138 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); 139 continue; 140 } 141 if (!fd->ino) { 142 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 143 fd->name); 144 ctx->pos++; 145 continue; 146 } 147 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 148 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 149 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) 150 break; 151 ctx->pos++; 152 } 153 mutex_unlock(&f->sem); 154 return 0; 155 } 156 157 /***********************************************************************/ 158 159 160 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, 161 umode_t mode, bool excl) 162 { 163 struct jffs2_raw_inode *ri; 164 struct jffs2_inode_info *f, *dir_f; 165 struct jffs2_sb_info *c; 166 struct inode *inode; 167 int ret; 168 169 ri = jffs2_alloc_raw_inode(); 170 if (!ri) 171 return -ENOMEM; 172 173 c = JFFS2_SB_INFO(dir_i->i_sb); 174 175 jffs2_dbg(1, "%s()\n", __func__); 176 177 inode = jffs2_new_inode(dir_i, mode, ri); 178 179 if (IS_ERR(inode)) { 180 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 181 jffs2_free_raw_inode(ri); 182 return PTR_ERR(inode); 183 } 184 185 inode->i_op = &jffs2_file_inode_operations; 186 inode->i_fop = &jffs2_file_operations; 187 inode->i_mapping->a_ops = &jffs2_file_address_operations; 188 inode->i_mapping->nrpages = 0; 189 190 f = JFFS2_INODE_INFO(inode); 191 dir_f = JFFS2_INODE_INFO(dir_i); 192 193 /* jffs2_do_create() will want to lock it, _after_ reserving 194 space and taking c-alloc_sem. If we keep it locked here, 195 lockdep gets unhappy (although it's a false positive; 196 nothing else will be looking at this inode yet so there's 197 no chance of AB-BA deadlock involving its f->sem). */ 198 mutex_unlock(&f->sem); 199 200 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 201 if (ret) 202 goto fail; 203 204 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 205 206 jffs2_free_raw_inode(ri); 207 208 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 209 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 210 f->inocache->pino_nlink, inode->i_mapping->nrpages); 211 212 unlock_new_inode(inode); 213 d_instantiate(dentry, inode); 214 return 0; 215 216 fail: 217 iget_failed(inode); 218 jffs2_free_raw_inode(ri); 219 return ret; 220 } 221 222 /***********************************************************************/ 223 224 225 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 226 { 227 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 228 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 229 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); 230 int ret; 231 uint32_t now = get_seconds(); 232 233 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 234 dentry->d_name.len, dead_f, now); 235 if (dead_f->inocache) 236 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); 237 if (!ret) 238 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 239 return ret; 240 } 241 /***********************************************************************/ 242 243 244 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 245 { 246 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); 247 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 248 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 249 int ret; 250 uint8_t type; 251 uint32_t now; 252 253 /* Don't let people make hard links to bad inodes. */ 254 if (!f->inocache) 255 return -EIO; 256 257 if (d_is_dir(old_dentry)) 258 return -EPERM; 259 260 /* XXX: This is ugly */ 261 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 262 if (!type) type = DT_REG; 263 264 now = get_seconds(); 265 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 266 267 if (!ret) { 268 mutex_lock(&f->sem); 269 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); 270 mutex_unlock(&f->sem); 271 d_instantiate(dentry, d_inode(old_dentry)); 272 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 273 ihold(d_inode(old_dentry)); 274 } 275 return ret; 276 } 277 278 /***********************************************************************/ 279 280 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 281 { 282 struct jffs2_inode_info *f, *dir_f; 283 struct jffs2_sb_info *c; 284 struct inode *inode; 285 struct jffs2_raw_inode *ri; 286 struct jffs2_raw_dirent *rd; 287 struct jffs2_full_dnode *fn; 288 struct jffs2_full_dirent *fd; 289 int namelen; 290 uint32_t alloclen; 291 int ret, targetlen = strlen(target); 292 293 /* FIXME: If you care. We'd need to use frags for the target 294 if it grows much more than this */ 295 if (targetlen > 254) 296 return -ENAMETOOLONG; 297 298 ri = jffs2_alloc_raw_inode(); 299 300 if (!ri) 301 return -ENOMEM; 302 303 c = JFFS2_SB_INFO(dir_i->i_sb); 304 305 /* Try to reserve enough space for both node and dirent. 306 * Just the node will do for now, though 307 */ 308 namelen = dentry->d_name.len; 309 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 310 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 311 312 if (ret) { 313 jffs2_free_raw_inode(ri); 314 return ret; 315 } 316 317 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 318 319 if (IS_ERR(inode)) { 320 jffs2_free_raw_inode(ri); 321 jffs2_complete_reservation(c); 322 return PTR_ERR(inode); 323 } 324 325 inode->i_op = &jffs2_symlink_inode_operations; 326 327 f = JFFS2_INODE_INFO(inode); 328 329 inode->i_size = targetlen; 330 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 331 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 332 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 333 334 ri->compr = JFFS2_COMPR_NONE; 335 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 336 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 337 338 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 339 340 jffs2_free_raw_inode(ri); 341 342 if (IS_ERR(fn)) { 343 /* Eeek. Wave bye bye */ 344 mutex_unlock(&f->sem); 345 jffs2_complete_reservation(c); 346 ret = PTR_ERR(fn); 347 goto fail; 348 } 349 350 /* We use f->target field to store the target path. */ 351 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 352 if (!f->target) { 353 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 354 mutex_unlock(&f->sem); 355 jffs2_complete_reservation(c); 356 ret = -ENOMEM; 357 goto fail; 358 } 359 inode->i_link = f->target; 360 361 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 362 __func__, (char *)f->target); 363 364 /* No data here. Only a metadata node, which will be 365 obsoleted by the first data write 366 */ 367 f->metadata = fn; 368 mutex_unlock(&f->sem); 369 370 jffs2_complete_reservation(c); 371 372 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 373 if (ret) 374 goto fail; 375 376 ret = jffs2_init_acl_post(inode); 377 if (ret) 378 goto fail; 379 380 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 381 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 382 if (ret) 383 goto fail; 384 385 rd = jffs2_alloc_raw_dirent(); 386 if (!rd) { 387 /* Argh. Now we treat it like a normal delete */ 388 jffs2_complete_reservation(c); 389 ret = -ENOMEM; 390 goto fail; 391 } 392 393 dir_f = JFFS2_INODE_INFO(dir_i); 394 mutex_lock(&dir_f->sem); 395 396 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 397 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 398 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 399 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 400 401 rd->pino = cpu_to_je32(dir_i->i_ino); 402 rd->version = cpu_to_je32(++dir_f->highest_version); 403 rd->ino = cpu_to_je32(inode->i_ino); 404 rd->mctime = cpu_to_je32(get_seconds()); 405 rd->nsize = namelen; 406 rd->type = DT_LNK; 407 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 408 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 409 410 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 411 412 if (IS_ERR(fd)) { 413 /* dirent failed to write. Delete the inode normally 414 as if it were the final unlink() */ 415 jffs2_complete_reservation(c); 416 jffs2_free_raw_dirent(rd); 417 mutex_unlock(&dir_f->sem); 418 ret = PTR_ERR(fd); 419 goto fail; 420 } 421 422 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 423 424 jffs2_free_raw_dirent(rd); 425 426 /* Link the fd into the inode's list, obsoleting an old 427 one if necessary. */ 428 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 429 430 mutex_unlock(&dir_f->sem); 431 jffs2_complete_reservation(c); 432 433 unlock_new_inode(inode); 434 d_instantiate(dentry, inode); 435 return 0; 436 437 fail: 438 iget_failed(inode); 439 return ret; 440 } 441 442 443 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) 444 { 445 struct jffs2_inode_info *f, *dir_f; 446 struct jffs2_sb_info *c; 447 struct inode *inode; 448 struct jffs2_raw_inode *ri; 449 struct jffs2_raw_dirent *rd; 450 struct jffs2_full_dnode *fn; 451 struct jffs2_full_dirent *fd; 452 int namelen; 453 uint32_t alloclen; 454 int ret; 455 456 mode |= S_IFDIR; 457 458 ri = jffs2_alloc_raw_inode(); 459 if (!ri) 460 return -ENOMEM; 461 462 c = JFFS2_SB_INFO(dir_i->i_sb); 463 464 /* Try to reserve enough space for both node and dirent. 465 * Just the node will do for now, though 466 */ 467 namelen = dentry->d_name.len; 468 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 469 JFFS2_SUMMARY_INODE_SIZE); 470 471 if (ret) { 472 jffs2_free_raw_inode(ri); 473 return ret; 474 } 475 476 inode = jffs2_new_inode(dir_i, mode, ri); 477 478 if (IS_ERR(inode)) { 479 jffs2_free_raw_inode(ri); 480 jffs2_complete_reservation(c); 481 return PTR_ERR(inode); 482 } 483 484 inode->i_op = &jffs2_dir_inode_operations; 485 inode->i_fop = &jffs2_dir_operations; 486 487 f = JFFS2_INODE_INFO(inode); 488 489 /* Directories get nlink 2 at start */ 490 set_nlink(inode, 2); 491 /* but ic->pino_nlink is the parent ino# */ 492 f->inocache->pino_nlink = dir_i->i_ino; 493 494 ri->data_crc = cpu_to_je32(0); 495 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 496 497 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 498 499 jffs2_free_raw_inode(ri); 500 501 if (IS_ERR(fn)) { 502 /* Eeek. Wave bye bye */ 503 mutex_unlock(&f->sem); 504 jffs2_complete_reservation(c); 505 ret = PTR_ERR(fn); 506 goto fail; 507 } 508 /* No data here. Only a metadata node, which will be 509 obsoleted by the first data write 510 */ 511 f->metadata = fn; 512 mutex_unlock(&f->sem); 513 514 jffs2_complete_reservation(c); 515 516 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 517 if (ret) 518 goto fail; 519 520 ret = jffs2_init_acl_post(inode); 521 if (ret) 522 goto fail; 523 524 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 525 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 526 if (ret) 527 goto fail; 528 529 rd = jffs2_alloc_raw_dirent(); 530 if (!rd) { 531 /* Argh. Now we treat it like a normal delete */ 532 jffs2_complete_reservation(c); 533 ret = -ENOMEM; 534 goto fail; 535 } 536 537 dir_f = JFFS2_INODE_INFO(dir_i); 538 mutex_lock(&dir_f->sem); 539 540 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 541 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 542 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 543 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 544 545 rd->pino = cpu_to_je32(dir_i->i_ino); 546 rd->version = cpu_to_je32(++dir_f->highest_version); 547 rd->ino = cpu_to_je32(inode->i_ino); 548 rd->mctime = cpu_to_je32(get_seconds()); 549 rd->nsize = namelen; 550 rd->type = DT_DIR; 551 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 552 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 553 554 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 555 556 if (IS_ERR(fd)) { 557 /* dirent failed to write. Delete the inode normally 558 as if it were the final unlink() */ 559 jffs2_complete_reservation(c); 560 jffs2_free_raw_dirent(rd); 561 mutex_unlock(&dir_f->sem); 562 ret = PTR_ERR(fd); 563 goto fail; 564 } 565 566 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 567 inc_nlink(dir_i); 568 569 jffs2_free_raw_dirent(rd); 570 571 /* Link the fd into the inode's list, obsoleting an old 572 one if necessary. */ 573 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 574 575 mutex_unlock(&dir_f->sem); 576 jffs2_complete_reservation(c); 577 578 unlock_new_inode(inode); 579 d_instantiate(dentry, inode); 580 return 0; 581 582 fail: 583 iget_failed(inode); 584 return ret; 585 } 586 587 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 588 { 589 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 590 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 591 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); 592 struct jffs2_full_dirent *fd; 593 int ret; 594 uint32_t now = get_seconds(); 595 596 for (fd = f->dents ; fd; fd = fd->next) { 597 if (fd->ino) 598 return -ENOTEMPTY; 599 } 600 601 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 602 dentry->d_name.len, f, now); 603 if (!ret) { 604 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 605 clear_nlink(d_inode(dentry)); 606 drop_nlink(dir_i); 607 } 608 return ret; 609 } 610 611 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) 612 { 613 struct jffs2_inode_info *f, *dir_f; 614 struct jffs2_sb_info *c; 615 struct inode *inode; 616 struct jffs2_raw_inode *ri; 617 struct jffs2_raw_dirent *rd; 618 struct jffs2_full_dnode *fn; 619 struct jffs2_full_dirent *fd; 620 int namelen; 621 union jffs2_device_node dev; 622 int devlen = 0; 623 uint32_t alloclen; 624 int ret; 625 626 ri = jffs2_alloc_raw_inode(); 627 if (!ri) 628 return -ENOMEM; 629 630 c = JFFS2_SB_INFO(dir_i->i_sb); 631 632 if (S_ISBLK(mode) || S_ISCHR(mode)) 633 devlen = jffs2_encode_dev(&dev, rdev); 634 635 /* Try to reserve enough space for both node and dirent. 636 * Just the node will do for now, though 637 */ 638 namelen = dentry->d_name.len; 639 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 640 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 641 642 if (ret) { 643 jffs2_free_raw_inode(ri); 644 return ret; 645 } 646 647 inode = jffs2_new_inode(dir_i, mode, ri); 648 649 if (IS_ERR(inode)) { 650 jffs2_free_raw_inode(ri); 651 jffs2_complete_reservation(c); 652 return PTR_ERR(inode); 653 } 654 inode->i_op = &jffs2_file_inode_operations; 655 init_special_inode(inode, inode->i_mode, rdev); 656 657 f = JFFS2_INODE_INFO(inode); 658 659 ri->dsize = ri->csize = cpu_to_je32(devlen); 660 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 661 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 662 663 ri->compr = JFFS2_COMPR_NONE; 664 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 665 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 666 667 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 668 669 jffs2_free_raw_inode(ri); 670 671 if (IS_ERR(fn)) { 672 /* Eeek. Wave bye bye */ 673 mutex_unlock(&f->sem); 674 jffs2_complete_reservation(c); 675 ret = PTR_ERR(fn); 676 goto fail; 677 } 678 /* No data here. Only a metadata node, which will be 679 obsoleted by the first data write 680 */ 681 f->metadata = fn; 682 mutex_unlock(&f->sem); 683 684 jffs2_complete_reservation(c); 685 686 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 687 if (ret) 688 goto fail; 689 690 ret = jffs2_init_acl_post(inode); 691 if (ret) 692 goto fail; 693 694 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 695 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 696 if (ret) 697 goto fail; 698 699 rd = jffs2_alloc_raw_dirent(); 700 if (!rd) { 701 /* Argh. Now we treat it like a normal delete */ 702 jffs2_complete_reservation(c); 703 ret = -ENOMEM; 704 goto fail; 705 } 706 707 dir_f = JFFS2_INODE_INFO(dir_i); 708 mutex_lock(&dir_f->sem); 709 710 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 711 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 712 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 713 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 714 715 rd->pino = cpu_to_je32(dir_i->i_ino); 716 rd->version = cpu_to_je32(++dir_f->highest_version); 717 rd->ino = cpu_to_je32(inode->i_ino); 718 rd->mctime = cpu_to_je32(get_seconds()); 719 rd->nsize = namelen; 720 721 /* XXX: This is ugly. */ 722 rd->type = (mode & S_IFMT) >> 12; 723 724 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 725 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 726 727 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 728 729 if (IS_ERR(fd)) { 730 /* dirent failed to write. Delete the inode normally 731 as if it were the final unlink() */ 732 jffs2_complete_reservation(c); 733 jffs2_free_raw_dirent(rd); 734 mutex_unlock(&dir_f->sem); 735 ret = PTR_ERR(fd); 736 goto fail; 737 } 738 739 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 740 741 jffs2_free_raw_dirent(rd); 742 743 /* Link the fd into the inode's list, obsoleting an old 744 one if necessary. */ 745 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 746 747 mutex_unlock(&dir_f->sem); 748 jffs2_complete_reservation(c); 749 750 unlock_new_inode(inode); 751 d_instantiate(dentry, inode); 752 return 0; 753 754 fail: 755 iget_failed(inode); 756 return ret; 757 } 758 759 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 760 struct inode *new_dir_i, struct dentry *new_dentry, 761 unsigned int flags) 762 { 763 int ret; 764 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 765 struct jffs2_inode_info *victim_f = NULL; 766 uint8_t type; 767 uint32_t now; 768 769 if (flags & ~RENAME_NOREPLACE) 770 return -EINVAL; 771 772 /* The VFS will check for us and prevent trying to rename a 773 * file over a directory and vice versa, but if it's a directory, 774 * the VFS can't check whether the victim is empty. The filesystem 775 * needs to do that for itself. 776 */ 777 if (d_really_is_positive(new_dentry)) { 778 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); 779 if (d_is_dir(new_dentry)) { 780 struct jffs2_full_dirent *fd; 781 782 mutex_lock(&victim_f->sem); 783 for (fd = victim_f->dents; fd; fd = fd->next) { 784 if (fd->ino) { 785 mutex_unlock(&victim_f->sem); 786 return -ENOTEMPTY; 787 } 788 } 789 mutex_unlock(&victim_f->sem); 790 } 791 } 792 793 /* XXX: We probably ought to alloc enough space for 794 both nodes at the same time. Writing the new link, 795 then getting -ENOSPC, is quite bad :) 796 */ 797 798 /* Make a hard link */ 799 800 /* XXX: This is ugly */ 801 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 802 if (!type) type = DT_REG; 803 804 now = get_seconds(); 805 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 806 d_inode(old_dentry)->i_ino, type, 807 new_dentry->d_name.name, new_dentry->d_name.len, now); 808 809 if (ret) 810 return ret; 811 812 if (victim_f) { 813 /* There was a victim. Kill it off nicely */ 814 if (d_is_dir(new_dentry)) 815 clear_nlink(d_inode(new_dentry)); 816 else 817 drop_nlink(d_inode(new_dentry)); 818 /* Don't oops if the victim was a dirent pointing to an 819 inode which didn't exist. */ 820 if (victim_f->inocache) { 821 mutex_lock(&victim_f->sem); 822 if (d_is_dir(new_dentry)) 823 victim_f->inocache->pino_nlink = 0; 824 else 825 victim_f->inocache->pino_nlink--; 826 mutex_unlock(&victim_f->sem); 827 } 828 } 829 830 /* If it was a directory we moved, and there was no victim, 831 increase i_nlink on its new parent */ 832 if (d_is_dir(old_dentry) && !victim_f) 833 inc_nlink(new_dir_i); 834 835 /* Unlink the original */ 836 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 837 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 838 839 /* We don't touch inode->i_nlink */ 840 841 if (ret) { 842 /* Oh shit. We really ought to make a single node which can do both atomically */ 843 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 844 mutex_lock(&f->sem); 845 inc_nlink(d_inode(old_dentry)); 846 if (f->inocache && !d_is_dir(old_dentry)) 847 f->inocache->pino_nlink++; 848 mutex_unlock(&f->sem); 849 850 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 851 __func__, ret); 852 /* 853 * We can't keep the target in dcache after that. 854 * For one thing, we can't afford dentry aliases for directories. 855 * For another, if there was a victim, we _can't_ set new inode 856 * for that sucker and we have to trigger mount eviction - the 857 * caller won't do it on its own since we are returning an error. 858 */ 859 d_invalidate(new_dentry); 860 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 861 return ret; 862 } 863 864 if (d_is_dir(old_dentry)) 865 drop_nlink(old_dir_i); 866 867 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 868 869 return 0; 870 } 871 872