1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2001-2003 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 * $Id: dir.c,v 1.85 2005/03/01 10:34:03 dedekind Exp $ 11 * 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/slab.h> 16 #include <linux/sched.h> 17 #include <linux/fs.h> 18 #include <linux/crc32.h> 19 #include <linux/jffs2.h> 20 #include <linux/jffs2_fs_i.h> 21 #include <linux/jffs2_fs_sb.h> 22 #include <linux/time.h> 23 #include "nodelist.h" 24 25 /* Urgh. Please tell me there's a nicer way of doing these. */ 26 #include <linux/version.h> 27 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,48) 28 typedef int mknod_arg_t; 29 #define NAMEI_COMPAT(x) ((void *)x) 30 #else 31 typedef dev_t mknod_arg_t; 32 #define NAMEI_COMPAT(x) (x) 33 #endif 34 35 static int jffs2_readdir (struct file *, void *, filldir_t); 36 37 static int jffs2_create (struct inode *,struct dentry *,int, 38 struct nameidata *); 39 static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 40 struct nameidata *); 41 static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 42 static int jffs2_unlink (struct inode *,struct dentry *); 43 static int jffs2_symlink (struct inode *,struct dentry *,const char *); 44 static int jffs2_mkdir (struct inode *,struct dentry *,int); 45 static int jffs2_rmdir (struct inode *,struct dentry *); 46 static int jffs2_mknod (struct inode *,struct dentry *,int,mknod_arg_t); 47 static int jffs2_rename (struct inode *, struct dentry *, 48 struct inode *, struct dentry *); 49 50 struct file_operations jffs2_dir_operations = 51 { 52 .read = generic_read_dir, 53 .readdir = jffs2_readdir, 54 .ioctl = jffs2_ioctl, 55 .fsync = jffs2_fsync 56 }; 57 58 59 struct inode_operations jffs2_dir_inode_operations = 60 { 61 .create = NAMEI_COMPAT(jffs2_create), 62 .lookup = NAMEI_COMPAT(jffs2_lookup), 63 .link = jffs2_link, 64 .unlink = jffs2_unlink, 65 .symlink = jffs2_symlink, 66 .mkdir = jffs2_mkdir, 67 .rmdir = jffs2_rmdir, 68 .mknod = jffs2_mknod, 69 .rename = jffs2_rename, 70 .setattr = jffs2_setattr, 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 struct nameidata *nd) 82 { 83 struct jffs2_inode_info *dir_f; 84 struct jffs2_sb_info *c; 85 struct jffs2_full_dirent *fd = NULL, *fd_list; 86 uint32_t ino = 0; 87 struct inode *inode = NULL; 88 89 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 90 91 dir_f = JFFS2_INODE_INFO(dir_i); 92 c = JFFS2_SB_INFO(dir_i->i_sb); 93 94 down(&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 <= target->d_name.hash; fd_list = fd_list->next) { 98 if (fd_list->nhash == target->d_name.hash && 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 up(&dir_f->sem); 108 if (ino) { 109 inode = iget(dir_i->i_sb, ino); 110 if (!inode) { 111 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 112 return (ERR_PTR(-EIO)); 113 } 114 } 115 116 d_add(target, inode); 117 118 return NULL; 119 } 120 121 /***********************************************************************/ 122 123 124 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 125 { 126 struct jffs2_inode_info *f; 127 struct jffs2_sb_info *c; 128 struct inode *inode = filp->f_dentry->d_inode; 129 struct jffs2_full_dirent *fd; 130 unsigned long offset, curofs; 131 132 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino)); 133 134 f = JFFS2_INODE_INFO(inode); 135 c = JFFS2_SB_INFO(inode->i_sb); 136 137 offset = filp->f_pos; 138 139 if (offset == 0) { 140 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 141 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 142 goto out; 143 offset++; 144 } 145 if (offset == 1) { 146 unsigned long pino = parent_ino(filp->f_dentry); 147 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 148 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 149 goto out; 150 offset++; 151 } 152 153 curofs=1; 154 down(&f->sem); 155 for (fd = f->dents; fd; fd = fd->next) { 156 157 curofs++; 158 /* First loop: curofs = 2; offset = 2 */ 159 if (curofs < offset) { 160 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 161 fd->name, fd->ino, fd->type, curofs, offset)); 162 continue; 163 } 164 if (!fd->ino) { 165 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 166 offset++; 167 continue; 168 } 169 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 170 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 171 break; 172 offset++; 173 } 174 up(&f->sem); 175 out: 176 filp->f_pos = offset; 177 return 0; 178 } 179 180 /***********************************************************************/ 181 182 183 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 184 struct nameidata *nd) 185 { 186 struct jffs2_raw_inode *ri; 187 struct jffs2_inode_info *f, *dir_f; 188 struct jffs2_sb_info *c; 189 struct inode *inode; 190 int ret; 191 192 ri = jffs2_alloc_raw_inode(); 193 if (!ri) 194 return -ENOMEM; 195 196 c = JFFS2_SB_INFO(dir_i->i_sb); 197 198 D1(printk(KERN_DEBUG "jffs2_create()\n")); 199 200 inode = jffs2_new_inode(dir_i, mode, ri); 201 202 if (IS_ERR(inode)) { 203 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 204 jffs2_free_raw_inode(ri); 205 return PTR_ERR(inode); 206 } 207 208 inode->i_op = &jffs2_file_inode_operations; 209 inode->i_fop = &jffs2_file_operations; 210 inode->i_mapping->a_ops = &jffs2_file_address_operations; 211 inode->i_mapping->nrpages = 0; 212 213 f = JFFS2_INODE_INFO(inode); 214 dir_f = JFFS2_INODE_INFO(dir_i); 215 216 ret = jffs2_do_create(c, dir_f, f, ri, 217 dentry->d_name.name, dentry->d_name.len); 218 219 if (ret) { 220 make_bad_inode(inode); 221 iput(inode); 222 jffs2_free_raw_inode(ri); 223 return ret; 224 } 225 226 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 227 228 jffs2_free_raw_inode(ri); 229 d_instantiate(dentry, inode); 230 231 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 232 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 233 return 0; 234 } 235 236 /***********************************************************************/ 237 238 239 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 240 { 241 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 242 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 243 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 244 int ret; 245 246 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 247 dentry->d_name.len, dead_f); 248 if (dead_f->inocache) 249 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 250 return ret; 251 } 252 /***********************************************************************/ 253 254 255 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 256 { 257 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 258 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 259 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 260 int ret; 261 uint8_t type; 262 263 /* Don't let people make hard links to bad inodes. */ 264 if (!f->inocache) 265 return -EIO; 266 267 if (S_ISDIR(old_dentry->d_inode->i_mode)) 268 return -EPERM; 269 270 /* XXX: This is ugly */ 271 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 272 if (!type) type = DT_REG; 273 274 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len); 275 276 if (!ret) { 277 down(&f->sem); 278 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 279 up(&f->sem); 280 d_instantiate(dentry, old_dentry->d_inode); 281 atomic_inc(&old_dentry->d_inode->i_count); 282 } 283 return ret; 284 } 285 286 /***********************************************************************/ 287 288 static int jffs2_symlink (struct inode *dir_i, 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, phys_ofs; 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 -EINVAL; 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, &phys_ofs, &alloclen, ALLOC_NORMAL); 318 319 if (ret) { 320 jffs2_free_raw_inode(ri); 321 return ret; 322 } 323 324 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 325 326 if (IS_ERR(inode)) { 327 jffs2_free_raw_inode(ri); 328 jffs2_complete_reservation(c); 329 return PTR_ERR(inode); 330 } 331 332 inode->i_op = &jffs2_symlink_inode_operations; 333 334 f = JFFS2_INODE_INFO(inode); 335 336 inode->i_size = targetlen; 337 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 338 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 339 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 340 341 ri->compr = JFFS2_COMPR_NONE; 342 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 343 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 344 345 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL); 346 347 jffs2_free_raw_inode(ri); 348 349 if (IS_ERR(fn)) { 350 /* Eeek. Wave bye bye */ 351 up(&f->sem); 352 jffs2_complete_reservation(c); 353 jffs2_clear_inode(inode); 354 return PTR_ERR(fn); 355 } 356 357 /* We use f->dents field to store the target path. */ 358 f->dents = kmalloc(targetlen + 1, GFP_KERNEL); 359 if (!f->dents) { 360 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 361 up(&f->sem); 362 jffs2_complete_reservation(c); 363 jffs2_clear_inode(inode); 364 return -ENOMEM; 365 } 366 367 memcpy(f->dents, target, targetlen + 1); 368 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents)); 369 370 /* No data here. Only a metadata node, which will be 371 obsoleted by the first data write 372 */ 373 f->metadata = fn; 374 up(&f->sem); 375 376 jffs2_complete_reservation(c); 377 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 378 if (ret) { 379 /* Eep. */ 380 jffs2_clear_inode(inode); 381 return ret; 382 } 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 jffs2_clear_inode(inode); 389 return -ENOMEM; 390 } 391 392 dir_f = JFFS2_INODE_INFO(dir_i); 393 down(&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, phys_ofs, 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 up(&dir_f->sem); 417 jffs2_clear_inode(inode); 418 return PTR_ERR(fd); 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 up(&dir_f->sem); 430 jffs2_complete_reservation(c); 431 432 d_instantiate(dentry, inode); 433 return 0; 434 } 435 436 437 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 438 { 439 struct jffs2_inode_info *f, *dir_f; 440 struct jffs2_sb_info *c; 441 struct inode *inode; 442 struct jffs2_raw_inode *ri; 443 struct jffs2_raw_dirent *rd; 444 struct jffs2_full_dnode *fn; 445 struct jffs2_full_dirent *fd; 446 int namelen; 447 uint32_t alloclen, phys_ofs; 448 int ret; 449 450 mode |= S_IFDIR; 451 452 ri = jffs2_alloc_raw_inode(); 453 if (!ri) 454 return -ENOMEM; 455 456 c = JFFS2_SB_INFO(dir_i->i_sb); 457 458 /* Try to reserve enough space for both node and dirent. 459 * Just the node will do for now, though 460 */ 461 namelen = dentry->d_name.len; 462 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); 463 464 if (ret) { 465 jffs2_free_raw_inode(ri); 466 return ret; 467 } 468 469 inode = jffs2_new_inode(dir_i, mode, ri); 470 471 if (IS_ERR(inode)) { 472 jffs2_free_raw_inode(ri); 473 jffs2_complete_reservation(c); 474 return PTR_ERR(inode); 475 } 476 477 inode->i_op = &jffs2_dir_inode_operations; 478 inode->i_fop = &jffs2_dir_operations; 479 /* Directories get nlink 2 at start */ 480 inode->i_nlink = 2; 481 482 f = JFFS2_INODE_INFO(inode); 483 484 ri->data_crc = cpu_to_je32(0); 485 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 486 487 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); 488 489 jffs2_free_raw_inode(ri); 490 491 if (IS_ERR(fn)) { 492 /* Eeek. Wave bye bye */ 493 up(&f->sem); 494 jffs2_complete_reservation(c); 495 jffs2_clear_inode(inode); 496 return PTR_ERR(fn); 497 } 498 /* No data here. Only a metadata node, which will be 499 obsoleted by the first data write 500 */ 501 f->metadata = fn; 502 up(&f->sem); 503 504 jffs2_complete_reservation(c); 505 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 506 if (ret) { 507 /* Eep. */ 508 jffs2_clear_inode(inode); 509 return ret; 510 } 511 512 rd = jffs2_alloc_raw_dirent(); 513 if (!rd) { 514 /* Argh. Now we treat it like a normal delete */ 515 jffs2_complete_reservation(c); 516 jffs2_clear_inode(inode); 517 return -ENOMEM; 518 } 519 520 dir_f = JFFS2_INODE_INFO(dir_i); 521 down(&dir_f->sem); 522 523 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 524 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 525 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 526 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 527 528 rd->pino = cpu_to_je32(dir_i->i_ino); 529 rd->version = cpu_to_je32(++dir_f->highest_version); 530 rd->ino = cpu_to_je32(inode->i_ino); 531 rd->mctime = cpu_to_je32(get_seconds()); 532 rd->nsize = namelen; 533 rd->type = DT_DIR; 534 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 535 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 536 537 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 538 539 if (IS_ERR(fd)) { 540 /* dirent failed to write. Delete the inode normally 541 as if it were the final unlink() */ 542 jffs2_complete_reservation(c); 543 jffs2_free_raw_dirent(rd); 544 up(&dir_f->sem); 545 jffs2_clear_inode(inode); 546 return PTR_ERR(fd); 547 } 548 549 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 550 dir_i->i_nlink++; 551 552 jffs2_free_raw_dirent(rd); 553 554 /* Link the fd into the inode's list, obsoleting an old 555 one if necessary. */ 556 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 557 558 up(&dir_f->sem); 559 jffs2_complete_reservation(c); 560 561 d_instantiate(dentry, inode); 562 return 0; 563 } 564 565 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 566 { 567 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 568 struct jffs2_full_dirent *fd; 569 int ret; 570 571 for (fd = f->dents ; fd; fd = fd->next) { 572 if (fd->ino) 573 return -ENOTEMPTY; 574 } 575 ret = jffs2_unlink(dir_i, dentry); 576 if (!ret) 577 dir_i->i_nlink--; 578 return ret; 579 } 580 581 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev) 582 { 583 struct jffs2_inode_info *f, *dir_f; 584 struct jffs2_sb_info *c; 585 struct inode *inode; 586 struct jffs2_raw_inode *ri; 587 struct jffs2_raw_dirent *rd; 588 struct jffs2_full_dnode *fn; 589 struct jffs2_full_dirent *fd; 590 int namelen; 591 jint16_t dev; 592 int devlen = 0; 593 uint32_t alloclen, phys_ofs; 594 int ret; 595 596 if (!old_valid_dev(rdev)) 597 return -EINVAL; 598 599 ri = jffs2_alloc_raw_inode(); 600 if (!ri) 601 return -ENOMEM; 602 603 c = JFFS2_SB_INFO(dir_i->i_sb); 604 605 if (S_ISBLK(mode) || S_ISCHR(mode)) { 606 dev = cpu_to_je16(old_encode_dev(rdev)); 607 devlen = sizeof(dev); 608 } 609 610 /* Try to reserve enough space for both node and dirent. 611 * Just the node will do for now, though 612 */ 613 namelen = dentry->d_name.len; 614 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL); 615 616 if (ret) { 617 jffs2_free_raw_inode(ri); 618 return ret; 619 } 620 621 inode = jffs2_new_inode(dir_i, mode, ri); 622 623 if (IS_ERR(inode)) { 624 jffs2_free_raw_inode(ri); 625 jffs2_complete_reservation(c); 626 return PTR_ERR(inode); 627 } 628 inode->i_op = &jffs2_file_inode_operations; 629 init_special_inode(inode, inode->i_mode, rdev); 630 631 f = JFFS2_INODE_INFO(inode); 632 633 ri->dsize = ri->csize = cpu_to_je32(devlen); 634 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 635 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 636 637 ri->compr = JFFS2_COMPR_NONE; 638 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 639 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 640 641 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); 642 643 jffs2_free_raw_inode(ri); 644 645 if (IS_ERR(fn)) { 646 /* Eeek. Wave bye bye */ 647 up(&f->sem); 648 jffs2_complete_reservation(c); 649 jffs2_clear_inode(inode); 650 return PTR_ERR(fn); 651 } 652 /* No data here. Only a metadata node, which will be 653 obsoleted by the first data write 654 */ 655 f->metadata = fn; 656 up(&f->sem); 657 658 jffs2_complete_reservation(c); 659 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 660 if (ret) { 661 /* Eep. */ 662 jffs2_clear_inode(inode); 663 return ret; 664 } 665 666 rd = jffs2_alloc_raw_dirent(); 667 if (!rd) { 668 /* Argh. Now we treat it like a normal delete */ 669 jffs2_complete_reservation(c); 670 jffs2_clear_inode(inode); 671 return -ENOMEM; 672 } 673 674 dir_f = JFFS2_INODE_INFO(dir_i); 675 down(&dir_f->sem); 676 677 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 678 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 679 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 680 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 681 682 rd->pino = cpu_to_je32(dir_i->i_ino); 683 rd->version = cpu_to_je32(++dir_f->highest_version); 684 rd->ino = cpu_to_je32(inode->i_ino); 685 rd->mctime = cpu_to_je32(get_seconds()); 686 rd->nsize = namelen; 687 688 /* XXX: This is ugly. */ 689 rd->type = (mode & S_IFMT) >> 12; 690 691 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 692 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 693 694 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 695 696 if (IS_ERR(fd)) { 697 /* dirent failed to write. Delete the inode normally 698 as if it were the final unlink() */ 699 jffs2_complete_reservation(c); 700 jffs2_free_raw_dirent(rd); 701 up(&dir_f->sem); 702 jffs2_clear_inode(inode); 703 return PTR_ERR(fd); 704 } 705 706 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 707 708 jffs2_free_raw_dirent(rd); 709 710 /* Link the fd into the inode's list, obsoleting an old 711 one if necessary. */ 712 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 713 714 up(&dir_f->sem); 715 jffs2_complete_reservation(c); 716 717 d_instantiate(dentry, inode); 718 719 return 0; 720 } 721 722 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 723 struct inode *new_dir_i, struct dentry *new_dentry) 724 { 725 int ret; 726 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 727 struct jffs2_inode_info *victim_f = NULL; 728 uint8_t type; 729 730 /* The VFS will check for us and prevent trying to rename a 731 * file over a directory and vice versa, but if it's a directory, 732 * the VFS can't check whether the victim is empty. The filesystem 733 * needs to do that for itself. 734 */ 735 if (new_dentry->d_inode) { 736 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 737 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 738 struct jffs2_full_dirent *fd; 739 740 down(&victim_f->sem); 741 for (fd = victim_f->dents; fd; fd = fd->next) { 742 if (fd->ino) { 743 up(&victim_f->sem); 744 return -ENOTEMPTY; 745 } 746 } 747 up(&victim_f->sem); 748 } 749 } 750 751 /* XXX: We probably ought to alloc enough space for 752 both nodes at the same time. Writing the new link, 753 then getting -ENOSPC, is quite bad :) 754 */ 755 756 /* Make a hard link */ 757 758 /* XXX: This is ugly */ 759 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 760 if (!type) type = DT_REG; 761 762 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 763 old_dentry->d_inode->i_ino, type, 764 new_dentry->d_name.name, new_dentry->d_name.len); 765 766 if (ret) 767 return ret; 768 769 if (victim_f) { 770 /* There was a victim. Kill it off nicely */ 771 new_dentry->d_inode->i_nlink--; 772 /* Don't oops if the victim was a dirent pointing to an 773 inode which didn't exist. */ 774 if (victim_f->inocache) { 775 down(&victim_f->sem); 776 victim_f->inocache->nlink--; 777 up(&victim_f->sem); 778 } 779 } 780 781 /* If it was a directory we moved, and there was no victim, 782 increase i_nlink on its new parent */ 783 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 784 new_dir_i->i_nlink++; 785 786 /* Unlink the original */ 787 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 788 old_dentry->d_name.name, old_dentry->d_name.len, NULL); 789 790 /* We don't touch inode->i_nlink */ 791 792 if (ret) { 793 /* Oh shit. We really ought to make a single node which can do both atomically */ 794 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 795 down(&f->sem); 796 old_dentry->d_inode->i_nlink++; 797 if (f->inocache) 798 f->inocache->nlink++; 799 up(&f->sem); 800 801 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 802 /* Might as well let the VFS know */ 803 d_instantiate(new_dentry, old_dentry->d_inode); 804 atomic_inc(&old_dentry->d_inode->i_count); 805 return ret; 806 } 807 808 if (S_ISDIR(old_dentry->d_inode->i_mode)) 809 old_dir_i->i_nlink--; 810 811 return 0; 812 } 813 814