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/filelock.h> 19 #include <linux/crc32.h> 20 #include <linux/jffs2.h> 21 #include "jffs2_fs_i.h" 22 #include "jffs2_fs_sb.h" 23 #include <linux/time.h> 24 #include "nodelist.h" 25 26 static int jffs2_readdir (struct file *, struct dir_context *); 27 28 static int jffs2_create (struct mnt_idmap *, struct inode *, 29 struct dentry *, umode_t, bool); 30 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 31 unsigned int); 32 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 33 static int jffs2_unlink (struct inode *,struct dentry *); 34 static int jffs2_symlink (struct mnt_idmap *, struct inode *, 35 struct dentry *, const char *); 36 static struct dentry *jffs2_mkdir (struct mnt_idmap *, struct inode *,struct dentry *, 37 umode_t); 38 static int jffs2_rmdir (struct inode *,struct dentry *); 39 static int jffs2_mknod (struct mnt_idmap *, struct inode *,struct dentry *, 40 umode_t,dev_t); 41 static int jffs2_rename (struct mnt_idmap *, struct inode *, 42 struct dentry *, struct inode *, struct dentry *, 43 unsigned int); 44 45 const struct file_operations jffs2_dir_operations = 46 { 47 .read = generic_read_dir, 48 .iterate_shared=jffs2_readdir, 49 .unlocked_ioctl=jffs2_ioctl, 50 .fsync = jffs2_fsync, 51 .llseek = generic_file_llseek, 52 .setlease = generic_setlease, 53 }; 54 55 56 const struct inode_operations jffs2_dir_inode_operations = 57 { 58 .create = jffs2_create, 59 .lookup = jffs2_lookup, 60 .link = jffs2_link, 61 .unlink = jffs2_unlink, 62 .symlink = jffs2_symlink, 63 .mkdir = jffs2_mkdir, 64 .rmdir = jffs2_rmdir, 65 .mknod = jffs2_mknod, 66 .rename = jffs2_rename, 67 .get_inode_acl = jffs2_get_acl, 68 .set_acl = jffs2_set_acl, 69 .setattr = jffs2_setattr, 70 .listxattr = jffs2_listxattr, 71 }; 72 73 /***********************************************************************/ 74 75 76 /* We keep the dirent list sorted in increasing order of name hash, 77 and we use the same hash function as the dentries. Makes this 78 nice and simple 79 */ 80 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 81 unsigned int flags) 82 { 83 struct jffs2_inode_info *dir_f; 84 struct jffs2_full_dirent *fd = NULL, *fd_list; 85 uint32_t ino = 0; 86 struct inode *inode = NULL; 87 unsigned int nhash; 88 89 jffs2_dbg(1, "jffs2_lookup()\n"); 90 91 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 92 return ERR_PTR(-ENAMETOOLONG); 93 94 dir_f = JFFS2_INODE_INFO(dir_i); 95 96 /* The 'nhash' on the fd_list is not the same as the dentry hash */ 97 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); 98 99 mutex_lock(&dir_f->sem); 100 101 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 102 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { 103 if (fd_list->nhash == nhash && 104 (!fd || fd_list->version > fd->version) && 105 strlen(fd_list->name) == target->d_name.len && 106 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 107 fd = fd_list; 108 } 109 } 110 if (fd) 111 ino = fd->ino; 112 mutex_unlock(&dir_f->sem); 113 if (ino) { 114 inode = jffs2_iget(dir_i->i_sb, ino); 115 if (IS_ERR(inode)) 116 pr_warn("iget() failed for ino #%u\n", ino); 117 } 118 119 return d_splice_alias(inode, target); 120 } 121 122 /***********************************************************************/ 123 124 125 static int jffs2_readdir(struct file *file, struct dir_context *ctx) 126 { 127 struct inode *inode = file_inode(file); 128 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 129 struct jffs2_full_dirent *fd; 130 unsigned long curofs = 1; 131 132 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); 133 134 if (!dir_emit_dots(file, ctx)) 135 return 0; 136 137 mutex_lock(&f->sem); 138 for (fd = f->dents; fd; fd = fd->next) { 139 curofs++; 140 /* First loop: curofs = 2; pos = 2 */ 141 if (curofs < ctx->pos) { 142 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 143 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); 144 continue; 145 } 146 if (!fd->ino) { 147 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 148 fd->name); 149 ctx->pos++; 150 continue; 151 } 152 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 153 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 154 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) 155 break; 156 ctx->pos++; 157 } 158 mutex_unlock(&f->sem); 159 return 0; 160 } 161 162 /***********************************************************************/ 163 164 165 static int jffs2_create(struct mnt_idmap *idmap, struct inode *dir_i, 166 struct dentry *dentry, umode_t mode, bool excl) 167 { 168 struct jffs2_raw_inode *ri; 169 struct jffs2_inode_info *f, *dir_f; 170 struct jffs2_sb_info *c; 171 struct inode *inode; 172 int ret; 173 174 ri = jffs2_alloc_raw_inode(); 175 if (!ri) 176 return -ENOMEM; 177 178 c = JFFS2_SB_INFO(dir_i->i_sb); 179 180 jffs2_dbg(1, "%s()\n", __func__); 181 182 inode = jffs2_new_inode(dir_i, mode, ri); 183 184 if (IS_ERR(inode)) { 185 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 186 jffs2_free_raw_inode(ri); 187 return PTR_ERR(inode); 188 } 189 190 inode->i_op = &jffs2_file_inode_operations; 191 inode->i_fop = &jffs2_file_operations; 192 inode->i_mapping->a_ops = &jffs2_file_address_operations; 193 inode->i_mapping->nrpages = 0; 194 195 f = JFFS2_INODE_INFO(inode); 196 dir_f = JFFS2_INODE_INFO(dir_i); 197 198 /* jffs2_do_create() will want to lock it, _after_ reserving 199 space and taking c-alloc_sem. If we keep it locked here, 200 lockdep gets unhappy (although it's a false positive; 201 nothing else will be looking at this inode yet so there's 202 no chance of AB-BA deadlock involving its f->sem). */ 203 mutex_unlock(&f->sem); 204 205 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 206 if (ret) 207 goto fail; 208 209 inode_set_mtime_to_ts(dir_i, 210 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(ri->ctime)))); 211 212 jffs2_free_raw_inode(ri); 213 214 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 215 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 216 f->inocache->pino_nlink, inode->i_mapping->nrpages); 217 218 d_instantiate_new(dentry, inode); 219 return 0; 220 221 fail: 222 iget_failed(inode); 223 jffs2_free_raw_inode(ri); 224 return ret; 225 } 226 227 /***********************************************************************/ 228 229 230 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 231 { 232 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 233 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 234 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); 235 int ret; 236 uint32_t now = JFFS2_NOW(); 237 238 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 239 dentry->d_name.len, dead_f, now); 240 if (dead_f->inocache) 241 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); 242 if (!ret) 243 inode_set_mtime_to_ts(dir_i, 244 inode_set_ctime_to_ts(dir_i, ITIME(now))); 245 return ret; 246 } 247 /***********************************************************************/ 248 249 250 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 251 { 252 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); 253 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 254 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 255 int ret; 256 uint8_t type; 257 uint32_t now; 258 259 /* Don't let people make hard links to bad inodes. */ 260 if (!f->inocache) 261 return -EIO; 262 263 if (d_is_dir(old_dentry)) 264 return -EPERM; 265 266 /* XXX: This is ugly */ 267 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 268 if (!type) type = DT_REG; 269 270 now = JFFS2_NOW(); 271 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 272 273 if (!ret) { 274 mutex_lock(&f->sem); 275 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); 276 mutex_unlock(&f->sem); 277 d_instantiate(dentry, d_inode(old_dentry)); 278 inode_set_mtime_to_ts(dir_i, 279 inode_set_ctime_to_ts(dir_i, ITIME(now))); 280 ihold(d_inode(old_dentry)); 281 } 282 return ret; 283 } 284 285 /***********************************************************************/ 286 287 static int jffs2_symlink (struct mnt_idmap *idmap, struct inode *dir_i, 288 struct dentry *dentry, const char *target) 289 { 290 struct jffs2_inode_info *f, *dir_f; 291 struct jffs2_sb_info *c; 292 struct inode *inode; 293 struct jffs2_raw_inode *ri; 294 struct jffs2_raw_dirent *rd; 295 struct jffs2_full_dnode *fn; 296 struct jffs2_full_dirent *fd; 297 int namelen; 298 uint32_t alloclen; 299 int ret, targetlen = strlen(target); 300 301 /* FIXME: If you care. We'd need to use frags for the target 302 if it grows much more than this */ 303 if (targetlen > 254) 304 return -ENAMETOOLONG; 305 306 ri = jffs2_alloc_raw_inode(); 307 308 if (!ri) 309 return -ENOMEM; 310 311 c = JFFS2_SB_INFO(dir_i->i_sb); 312 313 /* Try to reserve enough space for both node and dirent. 314 * Just the node will do for now, though 315 */ 316 namelen = dentry->d_name.len; 317 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 318 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 319 320 if (ret) { 321 jffs2_free_raw_inode(ri); 322 return ret; 323 } 324 325 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 326 327 if (IS_ERR(inode)) { 328 jffs2_free_raw_inode(ri); 329 jffs2_complete_reservation(c); 330 return PTR_ERR(inode); 331 } 332 333 inode->i_op = &jffs2_symlink_inode_operations; 334 335 f = JFFS2_INODE_INFO(inode); 336 337 inode->i_size = targetlen; 338 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 339 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 340 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 341 342 ri->compr = JFFS2_COMPR_NONE; 343 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 344 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 345 346 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 347 348 jffs2_free_raw_inode(ri); 349 350 if (IS_ERR(fn)) { 351 /* Eeek. Wave bye bye */ 352 mutex_unlock(&f->sem); 353 jffs2_complete_reservation(c); 354 ret = PTR_ERR(fn); 355 goto fail; 356 } 357 358 /* We use f->target field to store the target path. */ 359 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 360 if (!f->target) { 361 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 362 mutex_unlock(&f->sem); 363 jffs2_complete_reservation(c); 364 ret = -ENOMEM; 365 goto fail; 366 } 367 inode->i_link = f->target; 368 369 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 370 __func__, (char *)f->target); 371 372 /* No data here. Only a metadata node, which will be 373 obsoleted by the first data write 374 */ 375 f->metadata = fn; 376 mutex_unlock(&f->sem); 377 378 jffs2_complete_reservation(c); 379 380 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 381 if (ret) 382 goto fail; 383 384 ret = jffs2_init_acl_post(inode); 385 if (ret) 386 goto fail; 387 388 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 389 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 390 if (ret) 391 goto fail; 392 393 rd = jffs2_alloc_raw_dirent(); 394 if (!rd) { 395 /* Argh. Now we treat it like a normal delete */ 396 jffs2_complete_reservation(c); 397 ret = -ENOMEM; 398 goto fail; 399 } 400 401 dir_f = JFFS2_INODE_INFO(dir_i); 402 mutex_lock(&dir_f->sem); 403 404 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 405 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 406 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 407 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 408 409 rd->pino = cpu_to_je32(dir_i->i_ino); 410 rd->version = cpu_to_je32(++dir_f->highest_version); 411 rd->ino = cpu_to_je32(inode->i_ino); 412 rd->mctime = cpu_to_je32(JFFS2_NOW()); 413 rd->nsize = namelen; 414 rd->type = DT_LNK; 415 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 416 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 417 418 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 419 420 if (IS_ERR(fd)) { 421 /* dirent failed to write. Delete the inode normally 422 as if it were the final unlink() */ 423 jffs2_complete_reservation(c); 424 jffs2_free_raw_dirent(rd); 425 mutex_unlock(&dir_f->sem); 426 ret = PTR_ERR(fd); 427 goto fail; 428 } 429 430 inode_set_mtime_to_ts(dir_i, 431 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 432 433 jffs2_free_raw_dirent(rd); 434 435 /* Link the fd into the inode's list, obsoleting an old 436 one if necessary. */ 437 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 438 439 mutex_unlock(&dir_f->sem); 440 jffs2_complete_reservation(c); 441 442 d_instantiate_new(dentry, inode); 443 return 0; 444 445 fail: 446 iget_failed(inode); 447 return ret; 448 } 449 450 451 static struct dentry *jffs2_mkdir (struct mnt_idmap *idmap, struct inode *dir_i, 452 struct dentry *dentry, umode_t mode) 453 { 454 struct jffs2_inode_info *f, *dir_f; 455 struct jffs2_sb_info *c; 456 struct inode *inode; 457 struct jffs2_raw_inode *ri; 458 struct jffs2_raw_dirent *rd; 459 struct jffs2_full_dnode *fn; 460 struct jffs2_full_dirent *fd; 461 int namelen; 462 uint32_t alloclen; 463 int ret; 464 465 mode |= S_IFDIR; 466 467 ri = jffs2_alloc_raw_inode(); 468 if (!ri) 469 return ERR_PTR(-ENOMEM); 470 471 c = JFFS2_SB_INFO(dir_i->i_sb); 472 473 /* Try to reserve enough space for both node and dirent. 474 * Just the node will do for now, though 475 */ 476 namelen = dentry->d_name.len; 477 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 478 JFFS2_SUMMARY_INODE_SIZE); 479 480 if (ret) { 481 jffs2_free_raw_inode(ri); 482 return ERR_PTR(ret); 483 } 484 485 inode = jffs2_new_inode(dir_i, mode, ri); 486 487 if (IS_ERR(inode)) { 488 jffs2_free_raw_inode(ri); 489 jffs2_complete_reservation(c); 490 return ERR_CAST(inode); 491 } 492 493 inode->i_op = &jffs2_dir_inode_operations; 494 inode->i_fop = &jffs2_dir_operations; 495 496 f = JFFS2_INODE_INFO(inode); 497 498 /* Directories get nlink 2 at start */ 499 set_nlink(inode, 2); 500 /* but ic->pino_nlink is the parent ino# */ 501 f->inocache->pino_nlink = dir_i->i_ino; 502 503 ri->data_crc = cpu_to_je32(0); 504 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 505 506 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 507 508 jffs2_free_raw_inode(ri); 509 510 if (IS_ERR(fn)) { 511 /* Eeek. Wave bye bye */ 512 mutex_unlock(&f->sem); 513 jffs2_complete_reservation(c); 514 ret = PTR_ERR(fn); 515 goto fail; 516 } 517 /* No data here. Only a metadata node, which will be 518 obsoleted by the first data write 519 */ 520 f->metadata = fn; 521 mutex_unlock(&f->sem); 522 523 jffs2_complete_reservation(c); 524 525 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 526 if (ret) 527 goto fail; 528 529 ret = jffs2_init_acl_post(inode); 530 if (ret) 531 goto fail; 532 533 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 534 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 535 if (ret) 536 goto fail; 537 538 rd = jffs2_alloc_raw_dirent(); 539 if (!rd) { 540 /* Argh. Now we treat it like a normal delete */ 541 jffs2_complete_reservation(c); 542 ret = -ENOMEM; 543 goto fail; 544 } 545 546 dir_f = JFFS2_INODE_INFO(dir_i); 547 mutex_lock(&dir_f->sem); 548 549 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 550 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 551 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 552 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 553 554 rd->pino = cpu_to_je32(dir_i->i_ino); 555 rd->version = cpu_to_je32(++dir_f->highest_version); 556 rd->ino = cpu_to_je32(inode->i_ino); 557 rd->mctime = cpu_to_je32(JFFS2_NOW()); 558 rd->nsize = namelen; 559 rd->type = DT_DIR; 560 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 561 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 562 563 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 564 565 if (IS_ERR(fd)) { 566 /* dirent failed to write. Delete the inode normally 567 as if it were the final unlink() */ 568 jffs2_complete_reservation(c); 569 jffs2_free_raw_dirent(rd); 570 mutex_unlock(&dir_f->sem); 571 ret = PTR_ERR(fd); 572 goto fail; 573 } 574 575 inode_set_mtime_to_ts(dir_i, 576 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 577 inc_nlink(dir_i); 578 579 jffs2_free_raw_dirent(rd); 580 581 /* Link the fd into the inode's list, obsoleting an old 582 one if necessary. */ 583 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 584 585 mutex_unlock(&dir_f->sem); 586 jffs2_complete_reservation(c); 587 588 d_instantiate_new(dentry, inode); 589 return NULL; 590 591 fail: 592 iget_failed(inode); 593 return ERR_PTR(ret); 594 } 595 596 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 597 { 598 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 599 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 600 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); 601 struct jffs2_full_dirent *fd; 602 int ret; 603 uint32_t now = JFFS2_NOW(); 604 605 mutex_lock(&f->sem); 606 for (fd = f->dents ; fd; fd = fd->next) { 607 if (fd->ino) { 608 mutex_unlock(&f->sem); 609 return -ENOTEMPTY; 610 } 611 } 612 mutex_unlock(&f->sem); 613 614 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 615 dentry->d_name.len, f, now); 616 if (!ret) { 617 inode_set_mtime_to_ts(dir_i, 618 inode_set_ctime_to_ts(dir_i, ITIME(now))); 619 clear_nlink(d_inode(dentry)); 620 drop_nlink(dir_i); 621 } 622 return ret; 623 } 624 625 static int jffs2_mknod (struct mnt_idmap *idmap, struct inode *dir_i, 626 struct dentry *dentry, umode_t mode, dev_t rdev) 627 { 628 struct jffs2_inode_info *f, *dir_f; 629 struct jffs2_sb_info *c; 630 struct inode *inode; 631 struct jffs2_raw_inode *ri; 632 struct jffs2_raw_dirent *rd; 633 struct jffs2_full_dnode *fn; 634 struct jffs2_full_dirent *fd; 635 int namelen; 636 union jffs2_device_node dev; 637 int devlen = 0; 638 uint32_t alloclen; 639 int ret; 640 641 ri = jffs2_alloc_raw_inode(); 642 if (!ri) 643 return -ENOMEM; 644 645 c = JFFS2_SB_INFO(dir_i->i_sb); 646 647 if (S_ISBLK(mode) || S_ISCHR(mode)) 648 devlen = jffs2_encode_dev(&dev, rdev); 649 650 /* Try to reserve enough space for both node and dirent. 651 * Just the node will do for now, though 652 */ 653 namelen = dentry->d_name.len; 654 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 655 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 656 657 if (ret) { 658 jffs2_free_raw_inode(ri); 659 return ret; 660 } 661 662 inode = jffs2_new_inode(dir_i, mode, ri); 663 664 if (IS_ERR(inode)) { 665 jffs2_free_raw_inode(ri); 666 jffs2_complete_reservation(c); 667 return PTR_ERR(inode); 668 } 669 inode->i_op = &jffs2_file_inode_operations; 670 init_special_inode(inode, inode->i_mode, rdev); 671 672 f = JFFS2_INODE_INFO(inode); 673 674 ri->dsize = ri->csize = cpu_to_je32(devlen); 675 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 676 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 677 678 ri->compr = JFFS2_COMPR_NONE; 679 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 680 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 681 682 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 683 684 jffs2_free_raw_inode(ri); 685 686 if (IS_ERR(fn)) { 687 /* Eeek. Wave bye bye */ 688 mutex_unlock(&f->sem); 689 jffs2_complete_reservation(c); 690 ret = PTR_ERR(fn); 691 goto fail; 692 } 693 /* No data here. Only a metadata node, which will be 694 obsoleted by the first data write 695 */ 696 f->metadata = fn; 697 mutex_unlock(&f->sem); 698 699 jffs2_complete_reservation(c); 700 701 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 702 if (ret) 703 goto fail; 704 705 ret = jffs2_init_acl_post(inode); 706 if (ret) 707 goto fail; 708 709 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 710 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 711 if (ret) 712 goto fail; 713 714 rd = jffs2_alloc_raw_dirent(); 715 if (!rd) { 716 /* Argh. Now we treat it like a normal delete */ 717 jffs2_complete_reservation(c); 718 ret = -ENOMEM; 719 goto fail; 720 } 721 722 dir_f = JFFS2_INODE_INFO(dir_i); 723 mutex_lock(&dir_f->sem); 724 725 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 726 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 727 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 728 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 729 730 rd->pino = cpu_to_je32(dir_i->i_ino); 731 rd->version = cpu_to_je32(++dir_f->highest_version); 732 rd->ino = cpu_to_je32(inode->i_ino); 733 rd->mctime = cpu_to_je32(JFFS2_NOW()); 734 rd->nsize = namelen; 735 736 /* XXX: This is ugly. */ 737 rd->type = (mode & S_IFMT) >> 12; 738 739 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 740 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 741 742 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 743 744 if (IS_ERR(fd)) { 745 /* dirent failed to write. Delete the inode normally 746 as if it were the final unlink() */ 747 jffs2_complete_reservation(c); 748 jffs2_free_raw_dirent(rd); 749 mutex_unlock(&dir_f->sem); 750 ret = PTR_ERR(fd); 751 goto fail; 752 } 753 754 inode_set_mtime_to_ts(dir_i, 755 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 756 757 jffs2_free_raw_dirent(rd); 758 759 /* Link the fd into the inode's list, obsoleting an old 760 one if necessary. */ 761 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 762 763 mutex_unlock(&dir_f->sem); 764 jffs2_complete_reservation(c); 765 766 d_instantiate_new(dentry, inode); 767 return 0; 768 769 fail: 770 iget_failed(inode); 771 return ret; 772 } 773 774 static int jffs2_rename (struct mnt_idmap *idmap, 775 struct inode *old_dir_i, struct dentry *old_dentry, 776 struct inode *new_dir_i, struct dentry *new_dentry, 777 unsigned int flags) 778 { 779 int ret; 780 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 781 struct jffs2_inode_info *victim_f = NULL; 782 uint8_t type; 783 uint32_t now; 784 785 if (flags & ~RENAME_NOREPLACE) 786 return -EINVAL; 787 788 /* The VFS will check for us and prevent trying to rename a 789 * file over a directory and vice versa, but if it's a directory, 790 * the VFS can't check whether the victim is empty. The filesystem 791 * needs to do that for itself. 792 */ 793 if (d_really_is_positive(new_dentry)) { 794 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); 795 if (d_is_dir(new_dentry)) { 796 struct jffs2_full_dirent *fd; 797 798 mutex_lock(&victim_f->sem); 799 for (fd = victim_f->dents; fd; fd = fd->next) { 800 if (fd->ino) { 801 mutex_unlock(&victim_f->sem); 802 return -ENOTEMPTY; 803 } 804 } 805 mutex_unlock(&victim_f->sem); 806 } 807 } 808 809 /* XXX: We probably ought to alloc enough space for 810 both nodes at the same time. Writing the new link, 811 then getting -ENOSPC, is quite bad :) 812 */ 813 814 /* Make a hard link */ 815 816 /* XXX: This is ugly */ 817 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 818 if (!type) type = DT_REG; 819 820 now = JFFS2_NOW(); 821 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 822 d_inode(old_dentry)->i_ino, type, 823 new_dentry->d_name.name, new_dentry->d_name.len, now); 824 825 if (ret) 826 return ret; 827 828 if (victim_f) { 829 /* There was a victim. Kill it off nicely */ 830 if (d_is_dir(new_dentry)) 831 clear_nlink(d_inode(new_dentry)); 832 else 833 drop_nlink(d_inode(new_dentry)); 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 (d_is_dir(new_dentry)) 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 (d_is_dir(old_dentry) && !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(d_inode(old_dentry)); 860 mutex_lock(&f->sem); 861 inc_nlink(d_inode(old_dentry)); 862 if (f->inocache && !d_is_dir(old_dentry)) 863 f->inocache->pino_nlink++; 864 mutex_unlock(&f->sem); 865 866 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 867 __func__, ret); 868 /* 869 * We can't keep the target in dcache after that. 870 * For one thing, we can't afford dentry aliases for directories. 871 * For another, if there was a victim, we _can't_ set new inode 872 * for that sucker and we have to trigger mount eviction - the 873 * caller won't do it on its own since we are returning an error. 874 */ 875 d_invalidate(new_dentry); 876 inode_set_mtime_to_ts(new_dir_i, 877 inode_set_ctime_to_ts(new_dir_i, ITIME(now))); 878 return ret; 879 } 880 881 if (d_is_dir(old_dentry)) 882 drop_nlink(old_dir_i); 883 884 inode_set_mtime_to_ts(old_dir_i, 885 inode_set_ctime_to_ts(old_dir_i, ITIME(now))); 886 inode_set_mtime_to_ts(new_dir_i, 887 inode_set_ctime_to_ts(new_dir_i, ITIME(now))); 888 889 return 0; 890 } 891 892