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