1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * 6 * Created by David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/fs.h> 15 #include <linux/crc32.h> 16 #include <linux/jffs2.h> 17 #include "jffs2_fs_i.h" 18 #include "jffs2_fs_sb.h" 19 #include <linux/time.h> 20 #include "nodelist.h" 21 22 static int jffs2_readdir (struct file *, void *, filldir_t); 23 24 static int jffs2_create (struct inode *,struct dentry *,int, 25 struct nameidata *); 26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 27 struct nameidata *); 28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 29 static int jffs2_unlink (struct inode *,struct dentry *); 30 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 31 static int jffs2_mkdir (struct inode *,struct dentry *,int); 32 static int jffs2_rmdir (struct inode *,struct dentry *); 33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 34 static int jffs2_rename (struct inode *, struct dentry *, 35 struct inode *, struct dentry *); 36 37 const struct file_operations jffs2_dir_operations = 38 { 39 .read = generic_read_dir, 40 .readdir = jffs2_readdir, 41 .ioctl = jffs2_ioctl, 42 .fsync = jffs2_fsync 43 }; 44 45 46 const struct inode_operations jffs2_dir_inode_operations = 47 { 48 .create = jffs2_create, 49 .lookup = jffs2_lookup, 50 .link = jffs2_link, 51 .unlink = jffs2_unlink, 52 .symlink = jffs2_symlink, 53 .mkdir = jffs2_mkdir, 54 .rmdir = jffs2_rmdir, 55 .mknod = jffs2_mknod, 56 .rename = jffs2_rename, 57 .permission = jffs2_permission, 58 .setattr = jffs2_setattr, 59 .setxattr = jffs2_setxattr, 60 .getxattr = jffs2_getxattr, 61 .listxattr = jffs2_listxattr, 62 .removexattr = jffs2_removexattr 63 }; 64 65 /***********************************************************************/ 66 67 68 /* We keep the dirent list sorted in increasing order of name hash, 69 and we use the same hash function as the dentries. Makes this 70 nice and simple 71 */ 72 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 73 struct nameidata *nd) 74 { 75 struct jffs2_inode_info *dir_f; 76 struct jffs2_sb_info *c; 77 struct jffs2_full_dirent *fd = NULL, *fd_list; 78 uint32_t ino = 0; 79 struct inode *inode = NULL; 80 81 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 82 83 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 84 return ERR_PTR(-ENAMETOOLONG); 85 86 dir_f = JFFS2_INODE_INFO(dir_i); 87 c = JFFS2_SB_INFO(dir_i->i_sb); 88 89 down(&dir_f->sem); 90 91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 93 if (fd_list->nhash == target->d_name.hash && 94 (!fd || fd_list->version > fd->version) && 95 strlen(fd_list->name) == target->d_name.len && 96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 97 fd = fd_list; 98 } 99 } 100 if (fd) 101 ino = fd->ino; 102 up(&dir_f->sem); 103 if (ino) { 104 inode = iget(dir_i->i_sb, ino); 105 if (!inode) { 106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 107 return (ERR_PTR(-EIO)); 108 } 109 } 110 111 d_add(target, inode); 112 113 return NULL; 114 } 115 116 /***********************************************************************/ 117 118 119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 120 { 121 struct jffs2_inode_info *f; 122 struct jffs2_sb_info *c; 123 struct inode *inode = filp->f_path.dentry->d_inode; 124 struct jffs2_full_dirent *fd; 125 unsigned long offset, curofs; 126 127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 128 129 f = JFFS2_INODE_INFO(inode); 130 c = JFFS2_SB_INFO(inode->i_sb); 131 132 offset = filp->f_pos; 133 134 if (offset == 0) { 135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 137 goto out; 138 offset++; 139 } 140 if (offset == 1) { 141 unsigned long pino = parent_ino(filp->f_path.dentry); 142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 144 goto out; 145 offset++; 146 } 147 148 curofs=1; 149 down(&f->sem); 150 for (fd = f->dents; fd; fd = fd->next) { 151 152 curofs++; 153 /* First loop: curofs = 2; offset = 2 */ 154 if (curofs < offset) { 155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 156 fd->name, fd->ino, fd->type, curofs, offset)); 157 continue; 158 } 159 if (!fd->ino) { 160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 161 offset++; 162 continue; 163 } 164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 166 break; 167 offset++; 168 } 169 up(&f->sem); 170 out: 171 filp->f_pos = offset; 172 return 0; 173 } 174 175 /***********************************************************************/ 176 177 178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 179 struct nameidata *nd) 180 { 181 struct jffs2_raw_inode *ri; 182 struct jffs2_inode_info *f, *dir_f; 183 struct jffs2_sb_info *c; 184 struct inode *inode; 185 struct posix_acl *acl; 186 int ret; 187 188 ri = jffs2_alloc_raw_inode(); 189 if (!ri) 190 return -ENOMEM; 191 192 c = JFFS2_SB_INFO(dir_i->i_sb); 193 194 D1(printk(KERN_DEBUG "jffs2_create()\n")); 195 196 inode = jffs2_new_inode(dir_i, mode, ri, &acl); 197 198 if (IS_ERR(inode)) { 199 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 200 jffs2_free_raw_inode(ri); 201 return PTR_ERR(inode); 202 } 203 204 inode->i_op = &jffs2_file_inode_operations; 205 inode->i_fop = &jffs2_file_operations; 206 inode->i_mapping->a_ops = &jffs2_file_address_operations; 207 inode->i_mapping->nrpages = 0; 208 209 f = JFFS2_INODE_INFO(inode); 210 dir_f = JFFS2_INODE_INFO(dir_i); 211 212 ret = jffs2_do_create(c, dir_f, f, ri, 213 dentry->d_name.name, dentry->d_name.len); 214 215 if (ret) 216 goto fail_acl; 217 218 ret = jffs2_init_security(inode, dir_i); 219 if (ret) 220 goto fail_acl; 221 ret = jffs2_init_acl(inode, acl); 222 if (ret) 223 goto fail; 224 225 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 226 227 jffs2_free_raw_inode(ri); 228 d_instantiate(dentry, inode); 229 230 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 231 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 232 return 0; 233 234 fail_acl: 235 posix_acl_release(acl); 236 fail: 237 make_bad_inode(inode); 238 iput(inode); 239 jffs2_free_raw_inode(ri); 240 return ret; 241 } 242 243 /***********************************************************************/ 244 245 246 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 247 { 248 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 250 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 251 int ret; 252 uint32_t now = get_seconds(); 253 254 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 255 dentry->d_name.len, dead_f, now); 256 if (dead_f->inocache) 257 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 258 if (!ret) 259 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 260 return ret; 261 } 262 /***********************************************************************/ 263 264 265 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 266 { 267 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 268 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 269 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 270 int ret; 271 uint8_t type; 272 uint32_t now; 273 274 /* Don't let people make hard links to bad inodes. */ 275 if (!f->inocache) 276 return -EIO; 277 278 if (S_ISDIR(old_dentry->d_inode->i_mode)) 279 return -EPERM; 280 281 /* XXX: This is ugly */ 282 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 283 if (!type) type = DT_REG; 284 285 now = get_seconds(); 286 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 287 288 if (!ret) { 289 down(&f->sem); 290 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 291 up(&f->sem); 292 d_instantiate(dentry, old_dentry->d_inode); 293 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 294 atomic_inc(&old_dentry->d_inode->i_count); 295 } 296 return ret; 297 } 298 299 /***********************************************************************/ 300 301 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 302 { 303 struct jffs2_inode_info *f, *dir_f; 304 struct jffs2_sb_info *c; 305 struct inode *inode; 306 struct jffs2_raw_inode *ri; 307 struct jffs2_raw_dirent *rd; 308 struct jffs2_full_dnode *fn; 309 struct jffs2_full_dirent *fd; 310 int namelen; 311 uint32_t alloclen; 312 struct posix_acl *acl; 313 int ret, targetlen = strlen(target); 314 315 /* FIXME: If you care. We'd need to use frags for the target 316 if it grows much more than this */ 317 if (targetlen > 254) 318 return -EINVAL; 319 320 ri = jffs2_alloc_raw_inode(); 321 322 if (!ri) 323 return -ENOMEM; 324 325 c = JFFS2_SB_INFO(dir_i->i_sb); 326 327 /* Try to reserve enough space for both node and dirent. 328 * Just the node will do for now, though 329 */ 330 namelen = dentry->d_name.len; 331 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 332 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 333 334 if (ret) { 335 jffs2_free_raw_inode(ri); 336 return ret; 337 } 338 339 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri, &acl); 340 341 if (IS_ERR(inode)) { 342 jffs2_free_raw_inode(ri); 343 jffs2_complete_reservation(c); 344 return PTR_ERR(inode); 345 } 346 347 inode->i_op = &jffs2_symlink_inode_operations; 348 349 f = JFFS2_INODE_INFO(inode); 350 351 inode->i_size = targetlen; 352 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 353 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 354 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 355 356 ri->compr = JFFS2_COMPR_NONE; 357 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 358 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 359 360 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 361 362 jffs2_free_raw_inode(ri); 363 364 if (IS_ERR(fn)) { 365 /* Eeek. Wave bye bye */ 366 up(&f->sem); 367 jffs2_complete_reservation(c); 368 jffs2_clear_inode(inode); 369 posix_acl_release(acl); 370 return PTR_ERR(fn); 371 } 372 373 /* We use f->target field to store the target path. */ 374 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 375 if (!f->target) { 376 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 377 up(&f->sem); 378 jffs2_complete_reservation(c); 379 jffs2_clear_inode(inode); 380 posix_acl_release(acl); 381 return -ENOMEM; 382 } 383 384 memcpy(f->target, target, targetlen + 1); 385 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 386 387 /* No data here. Only a metadata node, which will be 388 obsoleted by the first data write 389 */ 390 f->metadata = fn; 391 up(&f->sem); 392 393 jffs2_complete_reservation(c); 394 395 ret = jffs2_init_security(inode, dir_i); 396 if (ret) { 397 jffs2_clear_inode(inode); 398 posix_acl_release(acl); 399 return ret; 400 } 401 ret = jffs2_init_acl(inode, acl); 402 if (ret) { 403 jffs2_clear_inode(inode); 404 return ret; 405 } 406 407 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 408 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 409 if (ret) { 410 /* Eep. */ 411 jffs2_clear_inode(inode); 412 return ret; 413 } 414 415 rd = jffs2_alloc_raw_dirent(); 416 if (!rd) { 417 /* Argh. Now we treat it like a normal delete */ 418 jffs2_complete_reservation(c); 419 jffs2_clear_inode(inode); 420 return -ENOMEM; 421 } 422 423 dir_f = JFFS2_INODE_INFO(dir_i); 424 down(&dir_f->sem); 425 426 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 427 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 428 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 429 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 430 431 rd->pino = cpu_to_je32(dir_i->i_ino); 432 rd->version = cpu_to_je32(++dir_f->highest_version); 433 rd->ino = cpu_to_je32(inode->i_ino); 434 rd->mctime = cpu_to_je32(get_seconds()); 435 rd->nsize = namelen; 436 rd->type = DT_LNK; 437 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 438 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 439 440 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 441 442 if (IS_ERR(fd)) { 443 /* dirent failed to write. Delete the inode normally 444 as if it were the final unlink() */ 445 jffs2_complete_reservation(c); 446 jffs2_free_raw_dirent(rd); 447 up(&dir_f->sem); 448 jffs2_clear_inode(inode); 449 return PTR_ERR(fd); 450 } 451 452 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 453 454 jffs2_free_raw_dirent(rd); 455 456 /* Link the fd into the inode's list, obsoleting an old 457 one if necessary. */ 458 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 459 460 up(&dir_f->sem); 461 jffs2_complete_reservation(c); 462 463 d_instantiate(dentry, inode); 464 return 0; 465 } 466 467 468 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 469 { 470 struct jffs2_inode_info *f, *dir_f; 471 struct jffs2_sb_info *c; 472 struct inode *inode; 473 struct jffs2_raw_inode *ri; 474 struct jffs2_raw_dirent *rd; 475 struct jffs2_full_dnode *fn; 476 struct jffs2_full_dirent *fd; 477 int namelen; 478 uint32_t alloclen; 479 struct posix_acl *acl; 480 int ret; 481 482 mode |= S_IFDIR; 483 484 ri = jffs2_alloc_raw_inode(); 485 if (!ri) 486 return -ENOMEM; 487 488 c = JFFS2_SB_INFO(dir_i->i_sb); 489 490 /* Try to reserve enough space for both node and dirent. 491 * Just the node will do for now, though 492 */ 493 namelen = dentry->d_name.len; 494 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 495 JFFS2_SUMMARY_INODE_SIZE); 496 497 if (ret) { 498 jffs2_free_raw_inode(ri); 499 return ret; 500 } 501 502 inode = jffs2_new_inode(dir_i, mode, ri, &acl); 503 504 if (IS_ERR(inode)) { 505 jffs2_free_raw_inode(ri); 506 jffs2_complete_reservation(c); 507 return PTR_ERR(inode); 508 } 509 510 inode->i_op = &jffs2_dir_inode_operations; 511 inode->i_fop = &jffs2_dir_operations; 512 /* Directories get nlink 2 at start */ 513 inode->i_nlink = 2; 514 515 f = JFFS2_INODE_INFO(inode); 516 517 ri->data_crc = cpu_to_je32(0); 518 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 519 520 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 521 522 jffs2_free_raw_inode(ri); 523 524 if (IS_ERR(fn)) { 525 /* Eeek. Wave bye bye */ 526 up(&f->sem); 527 jffs2_complete_reservation(c); 528 jffs2_clear_inode(inode); 529 posix_acl_release(acl); 530 return PTR_ERR(fn); 531 } 532 /* No data here. Only a metadata node, which will be 533 obsoleted by the first data write 534 */ 535 f->metadata = fn; 536 up(&f->sem); 537 538 jffs2_complete_reservation(c); 539 540 ret = jffs2_init_security(inode, dir_i); 541 if (ret) { 542 jffs2_clear_inode(inode); 543 posix_acl_release(acl); 544 return ret; 545 } 546 ret = jffs2_init_acl(inode, acl); 547 if (ret) { 548 jffs2_clear_inode(inode); 549 return ret; 550 } 551 552 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 553 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 554 if (ret) { 555 /* Eep. */ 556 jffs2_clear_inode(inode); 557 return ret; 558 } 559 560 rd = jffs2_alloc_raw_dirent(); 561 if (!rd) { 562 /* Argh. Now we treat it like a normal delete */ 563 jffs2_complete_reservation(c); 564 jffs2_clear_inode(inode); 565 return -ENOMEM; 566 } 567 568 dir_f = JFFS2_INODE_INFO(dir_i); 569 down(&dir_f->sem); 570 571 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 572 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 573 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 574 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 575 576 rd->pino = cpu_to_je32(dir_i->i_ino); 577 rd->version = cpu_to_je32(++dir_f->highest_version); 578 rd->ino = cpu_to_je32(inode->i_ino); 579 rd->mctime = cpu_to_je32(get_seconds()); 580 rd->nsize = namelen; 581 rd->type = DT_DIR; 582 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 583 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 584 585 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 586 587 if (IS_ERR(fd)) { 588 /* dirent failed to write. Delete the inode normally 589 as if it were the final unlink() */ 590 jffs2_complete_reservation(c); 591 jffs2_free_raw_dirent(rd); 592 up(&dir_f->sem); 593 jffs2_clear_inode(inode); 594 return PTR_ERR(fd); 595 } 596 597 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 598 inc_nlink(dir_i); 599 600 jffs2_free_raw_dirent(rd); 601 602 /* Link the fd into the inode's list, obsoleting an old 603 one if necessary. */ 604 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 605 606 up(&dir_f->sem); 607 jffs2_complete_reservation(c); 608 609 d_instantiate(dentry, inode); 610 return 0; 611 } 612 613 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 614 { 615 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 616 struct jffs2_full_dirent *fd; 617 int ret; 618 619 for (fd = f->dents ; fd; fd = fd->next) { 620 if (fd->ino) 621 return -ENOTEMPTY; 622 } 623 ret = jffs2_unlink(dir_i, dentry); 624 if (!ret) 625 drop_nlink(dir_i); 626 return ret; 627 } 628 629 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 630 { 631 struct jffs2_inode_info *f, *dir_f; 632 struct jffs2_sb_info *c; 633 struct inode *inode; 634 struct jffs2_raw_inode *ri; 635 struct jffs2_raw_dirent *rd; 636 struct jffs2_full_dnode *fn; 637 struct jffs2_full_dirent *fd; 638 int namelen; 639 union jffs2_device_node dev; 640 int devlen = 0; 641 uint32_t alloclen; 642 struct posix_acl *acl; 643 int ret; 644 645 if (!new_valid_dev(rdev)) 646 return -EINVAL; 647 648 ri = jffs2_alloc_raw_inode(); 649 if (!ri) 650 return -ENOMEM; 651 652 c = JFFS2_SB_INFO(dir_i->i_sb); 653 654 if (S_ISBLK(mode) || S_ISCHR(mode)) 655 devlen = jffs2_encode_dev(&dev, rdev); 656 657 /* Try to reserve enough space for both node and dirent. 658 * Just the node will do for now, though 659 */ 660 namelen = dentry->d_name.len; 661 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 662 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 663 664 if (ret) { 665 jffs2_free_raw_inode(ri); 666 return ret; 667 } 668 669 inode = jffs2_new_inode(dir_i, mode, ri, &acl); 670 671 if (IS_ERR(inode)) { 672 jffs2_free_raw_inode(ri); 673 jffs2_complete_reservation(c); 674 return PTR_ERR(inode); 675 } 676 inode->i_op = &jffs2_file_inode_operations; 677 init_special_inode(inode, inode->i_mode, rdev); 678 679 f = JFFS2_INODE_INFO(inode); 680 681 ri->dsize = ri->csize = cpu_to_je32(devlen); 682 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 683 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 684 685 ri->compr = JFFS2_COMPR_NONE; 686 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 687 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 688 689 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 690 691 jffs2_free_raw_inode(ri); 692 693 if (IS_ERR(fn)) { 694 /* Eeek. Wave bye bye */ 695 up(&f->sem); 696 jffs2_complete_reservation(c); 697 jffs2_clear_inode(inode); 698 posix_acl_release(acl); 699 return PTR_ERR(fn); 700 } 701 /* No data here. Only a metadata node, which will be 702 obsoleted by the first data write 703 */ 704 f->metadata = fn; 705 up(&f->sem); 706 707 jffs2_complete_reservation(c); 708 709 ret = jffs2_init_security(inode, dir_i); 710 if (ret) { 711 jffs2_clear_inode(inode); 712 posix_acl_release(acl); 713 return ret; 714 } 715 ret = jffs2_init_acl(inode, acl); 716 if (ret) { 717 jffs2_clear_inode(inode); 718 return ret; 719 } 720 721 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 722 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 723 if (ret) { 724 /* Eep. */ 725 jffs2_clear_inode(inode); 726 return ret; 727 } 728 729 rd = jffs2_alloc_raw_dirent(); 730 if (!rd) { 731 /* Argh. Now we treat it like a normal delete */ 732 jffs2_complete_reservation(c); 733 jffs2_clear_inode(inode); 734 return -ENOMEM; 735 } 736 737 dir_f = JFFS2_INODE_INFO(dir_i); 738 down(&dir_f->sem); 739 740 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 741 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 742 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 743 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 744 745 rd->pino = cpu_to_je32(dir_i->i_ino); 746 rd->version = cpu_to_je32(++dir_f->highest_version); 747 rd->ino = cpu_to_je32(inode->i_ino); 748 rd->mctime = cpu_to_je32(get_seconds()); 749 rd->nsize = namelen; 750 751 /* XXX: This is ugly. */ 752 rd->type = (mode & S_IFMT) >> 12; 753 754 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 755 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 756 757 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 758 759 if (IS_ERR(fd)) { 760 /* dirent failed to write. Delete the inode normally 761 as if it were the final unlink() */ 762 jffs2_complete_reservation(c); 763 jffs2_free_raw_dirent(rd); 764 up(&dir_f->sem); 765 jffs2_clear_inode(inode); 766 return PTR_ERR(fd); 767 } 768 769 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 770 771 jffs2_free_raw_dirent(rd); 772 773 /* Link the fd into the inode's list, obsoleting an old 774 one if necessary. */ 775 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 776 777 up(&dir_f->sem); 778 jffs2_complete_reservation(c); 779 780 d_instantiate(dentry, inode); 781 782 return 0; 783 } 784 785 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 786 struct inode *new_dir_i, struct dentry *new_dentry) 787 { 788 int ret; 789 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 790 struct jffs2_inode_info *victim_f = NULL; 791 uint8_t type; 792 uint32_t now; 793 794 /* The VFS will check for us and prevent trying to rename a 795 * file over a directory and vice versa, but if it's a directory, 796 * the VFS can't check whether the victim is empty. The filesystem 797 * needs to do that for itself. 798 */ 799 if (new_dentry->d_inode) { 800 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 801 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 802 struct jffs2_full_dirent *fd; 803 804 down(&victim_f->sem); 805 for (fd = victim_f->dents; fd; fd = fd->next) { 806 if (fd->ino) { 807 up(&victim_f->sem); 808 return -ENOTEMPTY; 809 } 810 } 811 up(&victim_f->sem); 812 } 813 } 814 815 /* XXX: We probably ought to alloc enough space for 816 both nodes at the same time. Writing the new link, 817 then getting -ENOSPC, is quite bad :) 818 */ 819 820 /* Make a hard link */ 821 822 /* XXX: This is ugly */ 823 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 824 if (!type) type = DT_REG; 825 826 now = get_seconds(); 827 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 828 old_dentry->d_inode->i_ino, type, 829 new_dentry->d_name.name, new_dentry->d_name.len, now); 830 831 if (ret) 832 return ret; 833 834 if (victim_f) { 835 /* There was a victim. Kill it off nicely */ 836 drop_nlink(new_dentry->d_inode); 837 /* Don't oops if the victim was a dirent pointing to an 838 inode which didn't exist. */ 839 if (victim_f->inocache) { 840 down(&victim_f->sem); 841 victim_f->inocache->nlink--; 842 up(&victim_f->sem); 843 } 844 } 845 846 /* If it was a directory we moved, and there was no victim, 847 increase i_nlink on its new parent */ 848 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 849 inc_nlink(new_dir_i); 850 851 /* Unlink the original */ 852 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 853 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 854 855 /* We don't touch inode->i_nlink */ 856 857 if (ret) { 858 /* Oh shit. We really ought to make a single node which can do both atomically */ 859 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 860 down(&f->sem); 861 inc_nlink(old_dentry->d_inode); 862 if (f->inocache) 863 f->inocache->nlink++; 864 up(&f->sem); 865 866 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 867 /* Might as well let the VFS know */ 868 d_instantiate(new_dentry, old_dentry->d_inode); 869 atomic_inc(&old_dentry->d_inode->i_count); 870 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 871 return ret; 872 } 873 874 if (S_ISDIR(old_dentry->d_inode->i_mode)) 875 drop_nlink(old_dir_i); 876 877 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 878 879 return 0; 880 } 881 882