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 1.84 2004/11/16 20:36:11 dwmw2 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; 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 (strlen(target) > 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) + strlen(target), &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 = strlen(target); 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, strlen(target))); 343 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 344 345 fn = jffs2_write_dnode(c, f, ri, target, strlen(target), 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 /* No data here. Only a metadata node, which will be 357 obsoleted by the first data write 358 */ 359 f->metadata = fn; 360 up(&f->sem); 361 362 jffs2_complete_reservation(c); 363 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 364 if (ret) { 365 /* Eep. */ 366 jffs2_clear_inode(inode); 367 return ret; 368 } 369 370 rd = jffs2_alloc_raw_dirent(); 371 if (!rd) { 372 /* Argh. Now we treat it like a normal delete */ 373 jffs2_complete_reservation(c); 374 jffs2_clear_inode(inode); 375 return -ENOMEM; 376 } 377 378 dir_f = JFFS2_INODE_INFO(dir_i); 379 down(&dir_f->sem); 380 381 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 382 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 383 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 384 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 385 386 rd->pino = cpu_to_je32(dir_i->i_ino); 387 rd->version = cpu_to_je32(++dir_f->highest_version); 388 rd->ino = cpu_to_je32(inode->i_ino); 389 rd->mctime = cpu_to_je32(get_seconds()); 390 rd->nsize = namelen; 391 rd->type = DT_LNK; 392 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 393 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 394 395 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 396 397 if (IS_ERR(fd)) { 398 /* dirent failed to write. Delete the inode normally 399 as if it were the final unlink() */ 400 jffs2_complete_reservation(c); 401 jffs2_free_raw_dirent(rd); 402 up(&dir_f->sem); 403 jffs2_clear_inode(inode); 404 return PTR_ERR(fd); 405 } 406 407 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 408 409 jffs2_free_raw_dirent(rd); 410 411 /* Link the fd into the inode's list, obsoleting an old 412 one if necessary. */ 413 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 414 415 up(&dir_f->sem); 416 jffs2_complete_reservation(c); 417 418 d_instantiate(dentry, inode); 419 return 0; 420 } 421 422 423 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 424 { 425 struct jffs2_inode_info *f, *dir_f; 426 struct jffs2_sb_info *c; 427 struct inode *inode; 428 struct jffs2_raw_inode *ri; 429 struct jffs2_raw_dirent *rd; 430 struct jffs2_full_dnode *fn; 431 struct jffs2_full_dirent *fd; 432 int namelen; 433 uint32_t alloclen, phys_ofs; 434 int ret; 435 436 mode |= S_IFDIR; 437 438 ri = jffs2_alloc_raw_inode(); 439 if (!ri) 440 return -ENOMEM; 441 442 c = JFFS2_SB_INFO(dir_i->i_sb); 443 444 /* Try to reserve enough space for both node and dirent. 445 * Just the node will do for now, though 446 */ 447 namelen = dentry->d_name.len; 448 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); 449 450 if (ret) { 451 jffs2_free_raw_inode(ri); 452 return ret; 453 } 454 455 inode = jffs2_new_inode(dir_i, mode, ri); 456 457 if (IS_ERR(inode)) { 458 jffs2_free_raw_inode(ri); 459 jffs2_complete_reservation(c); 460 return PTR_ERR(inode); 461 } 462 463 inode->i_op = &jffs2_dir_inode_operations; 464 inode->i_fop = &jffs2_dir_operations; 465 /* Directories get nlink 2 at start */ 466 inode->i_nlink = 2; 467 468 f = JFFS2_INODE_INFO(inode); 469 470 ri->data_crc = cpu_to_je32(0); 471 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 472 473 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); 474 475 jffs2_free_raw_inode(ri); 476 477 if (IS_ERR(fn)) { 478 /* Eeek. Wave bye bye */ 479 up(&f->sem); 480 jffs2_complete_reservation(c); 481 jffs2_clear_inode(inode); 482 return PTR_ERR(fn); 483 } 484 /* No data here. Only a metadata node, which will be 485 obsoleted by the first data write 486 */ 487 f->metadata = fn; 488 up(&f->sem); 489 490 jffs2_complete_reservation(c); 491 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 492 if (ret) { 493 /* Eep. */ 494 jffs2_clear_inode(inode); 495 return ret; 496 } 497 498 rd = jffs2_alloc_raw_dirent(); 499 if (!rd) { 500 /* Argh. Now we treat it like a normal delete */ 501 jffs2_complete_reservation(c); 502 jffs2_clear_inode(inode); 503 return -ENOMEM; 504 } 505 506 dir_f = JFFS2_INODE_INFO(dir_i); 507 down(&dir_f->sem); 508 509 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 510 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 511 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 512 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 513 514 rd->pino = cpu_to_je32(dir_i->i_ino); 515 rd->version = cpu_to_je32(++dir_f->highest_version); 516 rd->ino = cpu_to_je32(inode->i_ino); 517 rd->mctime = cpu_to_je32(get_seconds()); 518 rd->nsize = namelen; 519 rd->type = DT_DIR; 520 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 521 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 522 523 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 524 525 if (IS_ERR(fd)) { 526 /* dirent failed to write. Delete the inode normally 527 as if it were the final unlink() */ 528 jffs2_complete_reservation(c); 529 jffs2_free_raw_dirent(rd); 530 up(&dir_f->sem); 531 jffs2_clear_inode(inode); 532 return PTR_ERR(fd); 533 } 534 535 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 536 dir_i->i_nlink++; 537 538 jffs2_free_raw_dirent(rd); 539 540 /* Link the fd into the inode's list, obsoleting an old 541 one if necessary. */ 542 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 543 544 up(&dir_f->sem); 545 jffs2_complete_reservation(c); 546 547 d_instantiate(dentry, inode); 548 return 0; 549 } 550 551 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 552 { 553 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 554 struct jffs2_full_dirent *fd; 555 int ret; 556 557 for (fd = f->dents ; fd; fd = fd->next) { 558 if (fd->ino) 559 return -ENOTEMPTY; 560 } 561 ret = jffs2_unlink(dir_i, dentry); 562 if (!ret) 563 dir_i->i_nlink--; 564 return ret; 565 } 566 567 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev) 568 { 569 struct jffs2_inode_info *f, *dir_f; 570 struct jffs2_sb_info *c; 571 struct inode *inode; 572 struct jffs2_raw_inode *ri; 573 struct jffs2_raw_dirent *rd; 574 struct jffs2_full_dnode *fn; 575 struct jffs2_full_dirent *fd; 576 int namelen; 577 jint16_t dev; 578 int devlen = 0; 579 uint32_t alloclen, phys_ofs; 580 int ret; 581 582 if (!old_valid_dev(rdev)) 583 return -EINVAL; 584 585 ri = jffs2_alloc_raw_inode(); 586 if (!ri) 587 return -ENOMEM; 588 589 c = JFFS2_SB_INFO(dir_i->i_sb); 590 591 if (S_ISBLK(mode) || S_ISCHR(mode)) { 592 dev = cpu_to_je16(old_encode_dev(rdev)); 593 devlen = sizeof(dev); 594 } 595 596 /* Try to reserve enough space for both node and dirent. 597 * Just the node will do for now, though 598 */ 599 namelen = dentry->d_name.len; 600 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL); 601 602 if (ret) { 603 jffs2_free_raw_inode(ri); 604 return ret; 605 } 606 607 inode = jffs2_new_inode(dir_i, mode, ri); 608 609 if (IS_ERR(inode)) { 610 jffs2_free_raw_inode(ri); 611 jffs2_complete_reservation(c); 612 return PTR_ERR(inode); 613 } 614 inode->i_op = &jffs2_file_inode_operations; 615 init_special_inode(inode, inode->i_mode, rdev); 616 617 f = JFFS2_INODE_INFO(inode); 618 619 ri->dsize = ri->csize = cpu_to_je32(devlen); 620 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 621 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 622 623 ri->compr = JFFS2_COMPR_NONE; 624 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 625 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 626 627 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); 628 629 jffs2_free_raw_inode(ri); 630 631 if (IS_ERR(fn)) { 632 /* Eeek. Wave bye bye */ 633 up(&f->sem); 634 jffs2_complete_reservation(c); 635 jffs2_clear_inode(inode); 636 return PTR_ERR(fn); 637 } 638 /* No data here. Only a metadata node, which will be 639 obsoleted by the first data write 640 */ 641 f->metadata = fn; 642 up(&f->sem); 643 644 jffs2_complete_reservation(c); 645 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 646 if (ret) { 647 /* Eep. */ 648 jffs2_clear_inode(inode); 649 return ret; 650 } 651 652 rd = jffs2_alloc_raw_dirent(); 653 if (!rd) { 654 /* Argh. Now we treat it like a normal delete */ 655 jffs2_complete_reservation(c); 656 jffs2_clear_inode(inode); 657 return -ENOMEM; 658 } 659 660 dir_f = JFFS2_INODE_INFO(dir_i); 661 down(&dir_f->sem); 662 663 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 664 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 665 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 666 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 667 668 rd->pino = cpu_to_je32(dir_i->i_ino); 669 rd->version = cpu_to_je32(++dir_f->highest_version); 670 rd->ino = cpu_to_je32(inode->i_ino); 671 rd->mctime = cpu_to_je32(get_seconds()); 672 rd->nsize = namelen; 673 674 /* XXX: This is ugly. */ 675 rd->type = (mode & S_IFMT) >> 12; 676 677 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 678 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 679 680 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 681 682 if (IS_ERR(fd)) { 683 /* dirent failed to write. Delete the inode normally 684 as if it were the final unlink() */ 685 jffs2_complete_reservation(c); 686 jffs2_free_raw_dirent(rd); 687 up(&dir_f->sem); 688 jffs2_clear_inode(inode); 689 return PTR_ERR(fd); 690 } 691 692 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 693 694 jffs2_free_raw_dirent(rd); 695 696 /* Link the fd into the inode's list, obsoleting an old 697 one if necessary. */ 698 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 699 700 up(&dir_f->sem); 701 jffs2_complete_reservation(c); 702 703 d_instantiate(dentry, inode); 704 705 return 0; 706 } 707 708 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 709 struct inode *new_dir_i, struct dentry *new_dentry) 710 { 711 int ret; 712 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 713 struct jffs2_inode_info *victim_f = NULL; 714 uint8_t type; 715 716 /* The VFS will check for us and prevent trying to rename a 717 * file over a directory and vice versa, but if it's a directory, 718 * the VFS can't check whether the victim is empty. The filesystem 719 * needs to do that for itself. 720 */ 721 if (new_dentry->d_inode) { 722 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 723 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 724 struct jffs2_full_dirent *fd; 725 726 down(&victim_f->sem); 727 for (fd = victim_f->dents; fd; fd = fd->next) { 728 if (fd->ino) { 729 up(&victim_f->sem); 730 return -ENOTEMPTY; 731 } 732 } 733 up(&victim_f->sem); 734 } 735 } 736 737 /* XXX: We probably ought to alloc enough space for 738 both nodes at the same time. Writing the new link, 739 then getting -ENOSPC, is quite bad :) 740 */ 741 742 /* Make a hard link */ 743 744 /* XXX: This is ugly */ 745 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 746 if (!type) type = DT_REG; 747 748 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 749 old_dentry->d_inode->i_ino, type, 750 new_dentry->d_name.name, new_dentry->d_name.len); 751 752 if (ret) 753 return ret; 754 755 if (victim_f) { 756 /* There was a victim. Kill it off nicely */ 757 new_dentry->d_inode->i_nlink--; 758 /* Don't oops if the victim was a dirent pointing to an 759 inode which didn't exist. */ 760 if (victim_f->inocache) { 761 down(&victim_f->sem); 762 victim_f->inocache->nlink--; 763 up(&victim_f->sem); 764 } 765 } 766 767 /* If it was a directory we moved, and there was no victim, 768 increase i_nlink on its new parent */ 769 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 770 new_dir_i->i_nlink++; 771 772 /* Unlink the original */ 773 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 774 old_dentry->d_name.name, old_dentry->d_name.len, NULL); 775 776 /* We don't touch inode->i_nlink */ 777 778 if (ret) { 779 /* Oh shit. We really ought to make a single node which can do both atomically */ 780 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 781 down(&f->sem); 782 old_dentry->d_inode->i_nlink++; 783 if (f->inocache) 784 f->inocache->nlink++; 785 up(&f->sem); 786 787 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 788 /* Might as well let the VFS know */ 789 d_instantiate(new_dentry, old_dentry->d_inode); 790 atomic_inc(&old_dentry->d_inode->i_count); 791 return ret; 792 } 793 794 if (S_ISDIR(old_dentry->d_inode->i_mode)) 795 old_dir_i->i_nlink--; 796 797 return 0; 798 } 799 800