dir.c revision 8fc37ec54cd8e37193b0d42809b785ff19661c34
1/* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 Red Hat, Inc. 5 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> 6 * 7 * Created by David Woodhouse <dwmw2@infradead.org> 8 * 9 * For licensing information, see the file 'LICENCE' in this directory. 10 * 11 */ 12 13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 14 15#include <linux/kernel.h> 16#include <linux/slab.h> 17#include <linux/fs.h> 18#include <linux/crc32.h> 19#include <linux/jffs2.h> 20#include "jffs2_fs_i.h" 21#include "jffs2_fs_sb.h" 22#include <linux/time.h> 23#include "nodelist.h" 24 25static int jffs2_readdir (struct file *, void *, filldir_t); 26 27static int jffs2_create (struct inode *,struct dentry *,umode_t, 28 bool); 29static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 30 unsigned int); 31static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 32static int jffs2_unlink (struct inode *,struct dentry *); 33static int jffs2_symlink (struct inode *,struct dentry *,const char *); 34static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); 35static int jffs2_rmdir (struct inode *,struct dentry *); 36static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); 37static int jffs2_rename (struct inode *, struct dentry *, 38 struct inode *, struct dentry *); 39 40const struct file_operations jffs2_dir_operations = 41{ 42 .read = generic_read_dir, 43 .readdir = jffs2_readdir, 44 .unlocked_ioctl=jffs2_ioctl, 45 .fsync = jffs2_fsync, 46 .llseek = generic_file_llseek, 47}; 48 49 50const struct inode_operations jffs2_dir_inode_operations = 51{ 52 .create = jffs2_create, 53 .lookup = jffs2_lookup, 54 .link = jffs2_link, 55 .unlink = jffs2_unlink, 56 .symlink = jffs2_symlink, 57 .mkdir = jffs2_mkdir, 58 .rmdir = jffs2_rmdir, 59 .mknod = jffs2_mknod, 60 .rename = jffs2_rename, 61 .get_acl = jffs2_get_acl, 62 .setattr = jffs2_setattr, 63 .setxattr = jffs2_setxattr, 64 .getxattr = jffs2_getxattr, 65 .listxattr = jffs2_listxattr, 66 .removexattr = jffs2_removexattr 67}; 68 69/***********************************************************************/ 70 71 72/* We keep the dirent list sorted in increasing order of name hash, 73 and we use the same hash function as the dentries. Makes this 74 nice and simple 75*/ 76static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 77 unsigned int flags) 78{ 79 struct jffs2_inode_info *dir_f; 80 struct jffs2_full_dirent *fd = NULL, *fd_list; 81 uint32_t ino = 0; 82 struct inode *inode = NULL; 83 84 jffs2_dbg(1, "jffs2_lookup()\n"); 85 86 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 87 return ERR_PTR(-ENAMETOOLONG); 88 89 dir_f = JFFS2_INODE_INFO(dir_i); 90 91 mutex_lock(&dir_f->sem); 92 93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 94 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 95 if (fd_list->nhash == target->d_name.hash && 96 (!fd || fd_list->version > fd->version) && 97 strlen(fd_list->name) == target->d_name.len && 98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 99 fd = fd_list; 100 } 101 } 102 if (fd) 103 ino = fd->ino; 104 mutex_unlock(&dir_f->sem); 105 if (ino) { 106 inode = jffs2_iget(dir_i->i_sb, ino); 107 if (IS_ERR(inode)) 108 pr_warn("iget() failed for ino #%u\n", ino); 109 } 110 111 return d_splice_alias(inode, target); 112} 113 114/***********************************************************************/ 115 116 117static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 118{ 119 struct jffs2_inode_info *f; 120 struct inode *inode = filp->f_path.dentry->d_inode; 121 struct jffs2_full_dirent *fd; 122 unsigned long offset, curofs; 123 124 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", 125 filp->f_path.dentry->d_inode->i_ino); 126 127 f = JFFS2_INODE_INFO(inode); 128 129 offset = filp->f_pos; 130 131 if (offset == 0) { 132 jffs2_dbg(1, "Dirent 0: \".\", ino #%lu\n", inode->i_ino); 133 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 134 goto out; 135 offset++; 136 } 137 if (offset == 1) { 138 unsigned long pino = parent_ino(filp->f_path.dentry); 139 jffs2_dbg(1, "Dirent 1: \"..\", ino #%lu\n", pino); 140 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 141 goto out; 142 offset++; 143 } 144 145 curofs=1; 146 mutex_lock(&f->sem); 147 for (fd = f->dents; fd; fd = fd->next) { 148 149 curofs++; 150 /* First loop: curofs = 2; offset = 2 */ 151 if (curofs < offset) { 152 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 153 fd->name, fd->ino, fd->type, curofs, offset); 154 continue; 155 } 156 if (!fd->ino) { 157 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 158 fd->name); 159 offset++; 160 continue; 161 } 162 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 163 offset, fd->name, fd->ino, fd->type); 164 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 165 break; 166 offset++; 167 } 168 mutex_unlock(&f->sem); 169 out: 170 filp->f_pos = offset; 171 return 0; 172} 173 174/***********************************************************************/ 175 176 177static int jffs2_create(struct inode *dir_i, struct dentry *dentry, 178 umode_t mode, bool excl) 179{ 180 struct jffs2_raw_inode *ri; 181 struct jffs2_inode_info *f, *dir_f; 182 struct jffs2_sb_info *c; 183 struct inode *inode; 184 int ret; 185 186 ri = jffs2_alloc_raw_inode(); 187 if (!ri) 188 return -ENOMEM; 189 190 c = JFFS2_SB_INFO(dir_i->i_sb); 191 192 jffs2_dbg(1, "%s()\n", __func__); 193 194 inode = jffs2_new_inode(dir_i, mode, ri); 195 196 if (IS_ERR(inode)) { 197 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 198 jffs2_free_raw_inode(ri); 199 return PTR_ERR(inode); 200 } 201 202 inode->i_op = &jffs2_file_inode_operations; 203 inode->i_fop = &jffs2_file_operations; 204 inode->i_mapping->a_ops = &jffs2_file_address_operations; 205 inode->i_mapping->nrpages = 0; 206 207 f = JFFS2_INODE_INFO(inode); 208 dir_f = JFFS2_INODE_INFO(dir_i); 209 210 /* jffs2_do_create() will want to lock it, _after_ reserving 211 space and taking c-alloc_sem. If we keep it locked here, 212 lockdep gets unhappy (although it's a false positive; 213 nothing else will be looking at this inode yet so there's 214 no chance of AB-BA deadlock involving its f->sem). */ 215 mutex_unlock(&f->sem); 216 217 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 218 if (ret) 219 goto fail; 220 221 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 222 223 jffs2_free_raw_inode(ri); 224 225 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 226 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 227 f->inocache->pino_nlink, inode->i_mapping->nrpages); 228 229 unlock_new_inode(inode); 230 d_instantiate(dentry, inode); 231 return 0; 232 233 fail: 234 iget_failed(inode); 235 jffs2_free_raw_inode(ri); 236 return ret; 237} 238 239/***********************************************************************/ 240 241 242static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 243{ 244 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 245 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 246 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 247 int ret; 248 uint32_t now = get_seconds(); 249 250 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 251 dentry->d_name.len, dead_f, now); 252 if (dead_f->inocache) 253 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); 254 if (!ret) 255 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 256 return ret; 257} 258/***********************************************************************/ 259 260 261static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 262{ 263 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 264 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 265 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 266 int ret; 267 uint8_t type; 268 uint32_t now; 269 270 /* Don't let people make hard links to bad inodes. */ 271 if (!f->inocache) 272 return -EIO; 273 274 if (S_ISDIR(old_dentry->d_inode->i_mode)) 275 return -EPERM; 276 277 /* XXX: This is ugly */ 278 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 279 if (!type) type = DT_REG; 280 281 now = get_seconds(); 282 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 283 284 if (!ret) { 285 mutex_lock(&f->sem); 286 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); 287 mutex_unlock(&f->sem); 288 d_instantiate(dentry, old_dentry->d_inode); 289 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 290 ihold(old_dentry->d_inode); 291 } 292 return ret; 293} 294 295/***********************************************************************/ 296 297static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 298{ 299 struct jffs2_inode_info *f, *dir_f; 300 struct jffs2_sb_info *c; 301 struct inode *inode; 302 struct jffs2_raw_inode *ri; 303 struct jffs2_raw_dirent *rd; 304 struct jffs2_full_dnode *fn; 305 struct jffs2_full_dirent *fd; 306 int namelen; 307 uint32_t alloclen; 308 int ret, targetlen = strlen(target); 309 310 /* FIXME: If you care. We'd need to use frags for the target 311 if it grows much more than this */ 312 if (targetlen > 254) 313 return -ENAMETOOLONG; 314 315 ri = jffs2_alloc_raw_inode(); 316 317 if (!ri) 318 return -ENOMEM; 319 320 c = JFFS2_SB_INFO(dir_i->i_sb); 321 322 /* Try to reserve enough space for both node and dirent. 323 * Just the node will do for now, though 324 */ 325 namelen = dentry->d_name.len; 326 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 327 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 328 329 if (ret) { 330 jffs2_free_raw_inode(ri); 331 return ret; 332 } 333 334 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 335 336 if (IS_ERR(inode)) { 337 jffs2_free_raw_inode(ri); 338 jffs2_complete_reservation(c); 339 return PTR_ERR(inode); 340 } 341 342 inode->i_op = &jffs2_symlink_inode_operations; 343 344 f = JFFS2_INODE_INFO(inode); 345 346 inode->i_size = targetlen; 347 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 348 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 349 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 350 351 ri->compr = JFFS2_COMPR_NONE; 352 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 353 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 354 355 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 356 357 jffs2_free_raw_inode(ri); 358 359 if (IS_ERR(fn)) { 360 /* Eeek. Wave bye bye */ 361 mutex_unlock(&f->sem); 362 jffs2_complete_reservation(c); 363 ret = PTR_ERR(fn); 364 goto fail; 365 } 366 367 /* We use f->target field to store the target path. */ 368 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 369 if (!f->target) { 370 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 371 mutex_unlock(&f->sem); 372 jffs2_complete_reservation(c); 373 ret = -ENOMEM; 374 goto fail; 375 } 376 377 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 378 __func__, (char *)f->target); 379 380 /* No data here. Only a metadata node, which will be 381 obsoleted by the first data write 382 */ 383 f->metadata = fn; 384 mutex_unlock(&f->sem); 385 386 jffs2_complete_reservation(c); 387 388 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 389 if (ret) 390 goto fail; 391 392 ret = jffs2_init_acl_post(inode); 393 if (ret) 394 goto fail; 395 396 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 397 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 398 if (ret) 399 goto fail; 400 401 rd = jffs2_alloc_raw_dirent(); 402 if (!rd) { 403 /* Argh. Now we treat it like a normal delete */ 404 jffs2_complete_reservation(c); 405 ret = -ENOMEM; 406 goto fail; 407 } 408 409 dir_f = JFFS2_INODE_INFO(dir_i); 410 mutex_lock(&dir_f->sem); 411 412 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 413 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 414 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 415 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 416 417 rd->pino = cpu_to_je32(dir_i->i_ino); 418 rd->version = cpu_to_je32(++dir_f->highest_version); 419 rd->ino = cpu_to_je32(inode->i_ino); 420 rd->mctime = cpu_to_je32(get_seconds()); 421 rd->nsize = namelen; 422 rd->type = DT_LNK; 423 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 424 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 425 426 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 427 428 if (IS_ERR(fd)) { 429 /* dirent failed to write. Delete the inode normally 430 as if it were the final unlink() */ 431 jffs2_complete_reservation(c); 432 jffs2_free_raw_dirent(rd); 433 mutex_unlock(&dir_f->sem); 434 ret = PTR_ERR(fd); 435 goto fail; 436 } 437 438 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 439 440 jffs2_free_raw_dirent(rd); 441 442 /* Link the fd into the inode's list, obsoleting an old 443 one if necessary. */ 444 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 445 446 mutex_unlock(&dir_f->sem); 447 jffs2_complete_reservation(c); 448 449 unlock_new_inode(inode); 450 d_instantiate(dentry, inode); 451 return 0; 452 453 fail: 454 iget_failed(inode); 455 return ret; 456} 457 458 459static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) 460{ 461 struct jffs2_inode_info *f, *dir_f; 462 struct jffs2_sb_info *c; 463 struct inode *inode; 464 struct jffs2_raw_inode *ri; 465 struct jffs2_raw_dirent *rd; 466 struct jffs2_full_dnode *fn; 467 struct jffs2_full_dirent *fd; 468 int namelen; 469 uint32_t alloclen; 470 int ret; 471 472 mode |= S_IFDIR; 473 474 ri = jffs2_alloc_raw_inode(); 475 if (!ri) 476 return -ENOMEM; 477 478 c = JFFS2_SB_INFO(dir_i->i_sb); 479 480 /* Try to reserve enough space for both node and dirent. 481 * Just the node will do for now, though 482 */ 483 namelen = dentry->d_name.len; 484 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 485 JFFS2_SUMMARY_INODE_SIZE); 486 487 if (ret) { 488 jffs2_free_raw_inode(ri); 489 return ret; 490 } 491 492 inode = jffs2_new_inode(dir_i, mode, ri); 493 494 if (IS_ERR(inode)) { 495 jffs2_free_raw_inode(ri); 496 jffs2_complete_reservation(c); 497 return PTR_ERR(inode); 498 } 499 500 inode->i_op = &jffs2_dir_inode_operations; 501 inode->i_fop = &jffs2_dir_operations; 502 503 f = JFFS2_INODE_INFO(inode); 504 505 /* Directories get nlink 2 at start */ 506 set_nlink(inode, 2); 507 /* but ic->pino_nlink is the parent ino# */ 508 f->inocache->pino_nlink = dir_i->i_ino; 509 510 ri->data_crc = cpu_to_je32(0); 511 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 512 513 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 514 515 jffs2_free_raw_inode(ri); 516 517 if (IS_ERR(fn)) { 518 /* Eeek. Wave bye bye */ 519 mutex_unlock(&f->sem); 520 jffs2_complete_reservation(c); 521 ret = PTR_ERR(fn); 522 goto fail; 523 } 524 /* No data here. Only a metadata node, which will be 525 obsoleted by the first data write 526 */ 527 f->metadata = fn; 528 mutex_unlock(&f->sem); 529 530 jffs2_complete_reservation(c); 531 532 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 533 if (ret) 534 goto fail; 535 536 ret = jffs2_init_acl_post(inode); 537 if (ret) 538 goto fail; 539 540 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 541 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 542 if (ret) 543 goto fail; 544 545 rd = jffs2_alloc_raw_dirent(); 546 if (!rd) { 547 /* Argh. Now we treat it like a normal delete */ 548 jffs2_complete_reservation(c); 549 ret = -ENOMEM; 550 goto fail; 551 } 552 553 dir_f = JFFS2_INODE_INFO(dir_i); 554 mutex_lock(&dir_f->sem); 555 556 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 557 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 558 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 559 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 560 561 rd->pino = cpu_to_je32(dir_i->i_ino); 562 rd->version = cpu_to_je32(++dir_f->highest_version); 563 rd->ino = cpu_to_je32(inode->i_ino); 564 rd->mctime = cpu_to_je32(get_seconds()); 565 rd->nsize = namelen; 566 rd->type = DT_DIR; 567 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 568 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 569 570 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 571 572 if (IS_ERR(fd)) { 573 /* dirent failed to write. Delete the inode normally 574 as if it were the final unlink() */ 575 jffs2_complete_reservation(c); 576 jffs2_free_raw_dirent(rd); 577 mutex_unlock(&dir_f->sem); 578 ret = PTR_ERR(fd); 579 goto fail; 580 } 581 582 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 583 inc_nlink(dir_i); 584 585 jffs2_free_raw_dirent(rd); 586 587 /* Link the fd into the inode's list, obsoleting an old 588 one if necessary. */ 589 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 590 591 mutex_unlock(&dir_f->sem); 592 jffs2_complete_reservation(c); 593 594 unlock_new_inode(inode); 595 d_instantiate(dentry, inode); 596 return 0; 597 598 fail: 599 iget_failed(inode); 600 return ret; 601} 602 603static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 604{ 605 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 606 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 608 struct jffs2_full_dirent *fd; 609 int ret; 610 uint32_t now = get_seconds(); 611 612 for (fd = f->dents ; fd; fd = fd->next) { 613 if (fd->ino) 614 return -ENOTEMPTY; 615 } 616 617 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 618 dentry->d_name.len, f, now); 619 if (!ret) { 620 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 621 clear_nlink(dentry->d_inode); 622 drop_nlink(dir_i); 623 } 624 return ret; 625} 626 627static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) 628{ 629 struct jffs2_inode_info *f, *dir_f; 630 struct jffs2_sb_info *c; 631 struct inode *inode; 632 struct jffs2_raw_inode *ri; 633 struct jffs2_raw_dirent *rd; 634 struct jffs2_full_dnode *fn; 635 struct jffs2_full_dirent *fd; 636 int namelen; 637 union jffs2_device_node dev; 638 int devlen = 0; 639 uint32_t alloclen; 640 int ret; 641 642 if (!new_valid_dev(rdev)) 643 return -EINVAL; 644 645 ri = jffs2_alloc_raw_inode(); 646 if (!ri) 647 return -ENOMEM; 648 649 c = JFFS2_SB_INFO(dir_i->i_sb); 650 651 if (S_ISBLK(mode) || S_ISCHR(mode)) 652 devlen = jffs2_encode_dev(&dev, rdev); 653 654 /* Try to reserve enough space for both node and dirent. 655 * Just the node will do for now, though 656 */ 657 namelen = dentry->d_name.len; 658 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 659 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 660 661 if (ret) { 662 jffs2_free_raw_inode(ri); 663 return ret; 664 } 665 666 inode = jffs2_new_inode(dir_i, mode, ri); 667 668 if (IS_ERR(inode)) { 669 jffs2_free_raw_inode(ri); 670 jffs2_complete_reservation(c); 671 return PTR_ERR(inode); 672 } 673 inode->i_op = &jffs2_file_inode_operations; 674 init_special_inode(inode, inode->i_mode, rdev); 675 676 f = JFFS2_INODE_INFO(inode); 677 678 ri->dsize = ri->csize = cpu_to_je32(devlen); 679 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 680 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 681 682 ri->compr = JFFS2_COMPR_NONE; 683 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 684 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 685 686 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 687 688 jffs2_free_raw_inode(ri); 689 690 if (IS_ERR(fn)) { 691 /* Eeek. Wave bye bye */ 692 mutex_unlock(&f->sem); 693 jffs2_complete_reservation(c); 694 ret = PTR_ERR(fn); 695 goto fail; 696 } 697 /* No data here. Only a metadata node, which will be 698 obsoleted by the first data write 699 */ 700 f->metadata = fn; 701 mutex_unlock(&f->sem); 702 703 jffs2_complete_reservation(c); 704 705 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 706 if (ret) 707 goto fail; 708 709 ret = jffs2_init_acl_post(inode); 710 if (ret) 711 goto fail; 712 713 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 714 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 715 if (ret) 716 goto fail; 717 718 rd = jffs2_alloc_raw_dirent(); 719 if (!rd) { 720 /* Argh. Now we treat it like a normal delete */ 721 jffs2_complete_reservation(c); 722 ret = -ENOMEM; 723 goto fail; 724 } 725 726 dir_f = JFFS2_INODE_INFO(dir_i); 727 mutex_lock(&dir_f->sem); 728 729 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 730 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 731 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 732 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 733 734 rd->pino = cpu_to_je32(dir_i->i_ino); 735 rd->version = cpu_to_je32(++dir_f->highest_version); 736 rd->ino = cpu_to_je32(inode->i_ino); 737 rd->mctime = cpu_to_je32(get_seconds()); 738 rd->nsize = namelen; 739 740 /* XXX: This is ugly. */ 741 rd->type = (mode & S_IFMT) >> 12; 742 743 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 744 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 745 746 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 747 748 if (IS_ERR(fd)) { 749 /* dirent failed to write. Delete the inode normally 750 as if it were the final unlink() */ 751 jffs2_complete_reservation(c); 752 jffs2_free_raw_dirent(rd); 753 mutex_unlock(&dir_f->sem); 754 ret = PTR_ERR(fd); 755 goto fail; 756 } 757 758 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 759 760 jffs2_free_raw_dirent(rd); 761 762 /* Link the fd into the inode's list, obsoleting an old 763 one if necessary. */ 764 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 765 766 mutex_unlock(&dir_f->sem); 767 jffs2_complete_reservation(c); 768 769 unlock_new_inode(inode); 770 d_instantiate(dentry, inode); 771 return 0; 772 773 fail: 774 iget_failed(inode); 775 return ret; 776} 777 778static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 779 struct inode *new_dir_i, struct dentry *new_dentry) 780{ 781 int ret; 782 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 783 struct jffs2_inode_info *victim_f = NULL; 784 uint8_t type; 785 uint32_t now; 786 787 /* The VFS will check for us and prevent trying to rename a 788 * file over a directory and vice versa, but if it's a directory, 789 * the VFS can't check whether the victim is empty. The filesystem 790 * needs to do that for itself. 791 */ 792 if (new_dentry->d_inode) { 793 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 794 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 795 struct jffs2_full_dirent *fd; 796 797 mutex_lock(&victim_f->sem); 798 for (fd = victim_f->dents; fd; fd = fd->next) { 799 if (fd->ino) { 800 mutex_unlock(&victim_f->sem); 801 return -ENOTEMPTY; 802 } 803 } 804 mutex_unlock(&victim_f->sem); 805 } 806 } 807 808 /* XXX: We probably ought to alloc enough space for 809 both nodes at the same time. Writing the new link, 810 then getting -ENOSPC, is quite bad :) 811 */ 812 813 /* Make a hard link */ 814 815 /* XXX: This is ugly */ 816 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 817 if (!type) type = DT_REG; 818 819 now = get_seconds(); 820 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 821 old_dentry->d_inode->i_ino, type, 822 new_dentry->d_name.name, new_dentry->d_name.len, now); 823 824 if (ret) 825 return ret; 826 827 if (victim_f) { 828 /* There was a victim. Kill it off nicely */ 829 if (S_ISDIR(new_dentry->d_inode->i_mode)) 830 clear_nlink(new_dentry->d_inode); 831 else 832 drop_nlink(new_dentry->d_inode); 833 /* Don't oops if the victim was a dirent pointing to an 834 inode which didn't exist. */ 835 if (victim_f->inocache) { 836 mutex_lock(&victim_f->sem); 837 if (S_ISDIR(new_dentry->d_inode->i_mode)) 838 victim_f->inocache->pino_nlink = 0; 839 else 840 victim_f->inocache->pino_nlink--; 841 mutex_unlock(&victim_f->sem); 842 } 843 } 844 845 /* If it was a directory we moved, and there was no victim, 846 increase i_nlink on its new parent */ 847 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 848 inc_nlink(new_dir_i); 849 850 /* Unlink the original */ 851 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 852 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 853 854 /* We don't touch inode->i_nlink */ 855 856 if (ret) { 857 /* Oh shit. We really ought to make a single node which can do both atomically */ 858 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 859 mutex_lock(&f->sem); 860 inc_nlink(old_dentry->d_inode); 861 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 862 f->inocache->pino_nlink++; 863 mutex_unlock(&f->sem); 864 865 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 866 __func__, ret); 867 /* Might as well let the VFS know */ 868 d_instantiate(new_dentry, old_dentry->d_inode); 869 ihold(old_dentry->d_inode); 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