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 *, struct dir_context *); 26 27static int jffs2_create (struct mnt_idmap *, struct inode *, 28 struct dentry *, umode_t, 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 mnt_idmap *, struct inode *, 34 struct dentry *, const char *); 35static int jffs2_mkdir (struct mnt_idmap *, struct inode *,struct dentry *, 36 umode_t); 37static int jffs2_rmdir (struct inode *,struct dentry *); 38static int jffs2_mknod (struct mnt_idmap *, struct inode *,struct dentry *, 39 umode_t,dev_t); 40static int jffs2_rename (struct mnt_idmap *, struct inode *, 41 struct dentry *, struct inode *, struct dentry *, 42 unsigned int); 43 44const struct file_operations jffs2_dir_operations = 45{ 46 .read = generic_read_dir, 47 .iterate_shared=jffs2_readdir, 48 .unlocked_ioctl=jffs2_ioctl, 49 .fsync = jffs2_fsync, 50 .llseek = generic_file_llseek, 51}; 52 53 54const struct inode_operations jffs2_dir_inode_operations = 55{ 56 .create = jffs2_create, 57 .lookup = jffs2_lookup, 58 .link = jffs2_link, 59 .unlink = jffs2_unlink, 60 .symlink = jffs2_symlink, 61 .mkdir = jffs2_mkdir, 62 .rmdir = jffs2_rmdir, 63 .mknod = jffs2_mknod, 64 .rename = jffs2_rename, 65 .get_inode_acl = jffs2_get_acl, 66 .set_acl = jffs2_set_acl, 67 .setattr = jffs2_setattr, 68 .listxattr = jffs2_listxattr, 69}; 70 71/***********************************************************************/ 72 73 74/* We keep the dirent list sorted in increasing order of name hash, 75 and we use the same hash function as the dentries. Makes this 76 nice and simple 77*/ 78static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 79 unsigned int flags) 80{ 81 struct jffs2_inode_info *dir_f; 82 struct jffs2_full_dirent *fd = NULL, *fd_list; 83 uint32_t ino = 0; 84 struct inode *inode = NULL; 85 unsigned int nhash; 86 87 jffs2_dbg(1, "jffs2_lookup()\n"); 88 89 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 90 return ERR_PTR(-ENAMETOOLONG); 91 92 dir_f = JFFS2_INODE_INFO(dir_i); 93 94 /* The 'nhash' on the fd_list is not the same as the dentry hash */ 95 nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); 96 97 mutex_lock(&dir_f->sem); 98 99 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 100 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { 101 if (fd_list->nhash == nhash && 102 (!fd || fd_list->version > fd->version) && 103 strlen(fd_list->name) == target->d_name.len && 104 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 105 fd = fd_list; 106 } 107 } 108 if (fd) 109 ino = fd->ino; 110 mutex_unlock(&dir_f->sem); 111 if (ino) { 112 inode = jffs2_iget(dir_i->i_sb, ino); 113 if (IS_ERR(inode)) 114 pr_warn("iget() failed for ino #%u\n", ino); 115 } 116 117 return d_splice_alias(inode, target); 118} 119 120/***********************************************************************/ 121 122 123static int jffs2_readdir(struct file *file, struct dir_context *ctx) 124{ 125 struct inode *inode = file_inode(file); 126 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 127 struct jffs2_full_dirent *fd; 128 unsigned long curofs = 1; 129 130 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); 131 132 if (!dir_emit_dots(file, ctx)) 133 return 0; 134 135 mutex_lock(&f->sem); 136 for (fd = f->dents; fd; fd = fd->next) { 137 curofs++; 138 /* First loop: curofs = 2; pos = 2 */ 139 if (curofs < ctx->pos) { 140 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 141 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); 142 continue; 143 } 144 if (!fd->ino) { 145 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 146 fd->name); 147 ctx->pos++; 148 continue; 149 } 150 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 151 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 152 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) 153 break; 154 ctx->pos++; 155 } 156 mutex_unlock(&f->sem); 157 return 0; 158} 159 160/***********************************************************************/ 161 162 163static int jffs2_create(struct mnt_idmap *idmap, struct inode *dir_i, 164 struct dentry *dentry, umode_t mode, bool excl) 165{ 166 struct jffs2_raw_inode *ri; 167 struct jffs2_inode_info *f, *dir_f; 168 struct jffs2_sb_info *c; 169 struct inode *inode; 170 int ret; 171 172 ri = jffs2_alloc_raw_inode(); 173 if (!ri) 174 return -ENOMEM; 175 176 c = JFFS2_SB_INFO(dir_i->i_sb); 177 178 jffs2_dbg(1, "%s()\n", __func__); 179 180 inode = jffs2_new_inode(dir_i, mode, ri); 181 182 if (IS_ERR(inode)) { 183 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 184 jffs2_free_raw_inode(ri); 185 return PTR_ERR(inode); 186 } 187 188 inode->i_op = &jffs2_file_inode_operations; 189 inode->i_fop = &jffs2_file_operations; 190 inode->i_mapping->a_ops = &jffs2_file_address_operations; 191 inode->i_mapping->nrpages = 0; 192 193 f = JFFS2_INODE_INFO(inode); 194 dir_f = JFFS2_INODE_INFO(dir_i); 195 196 /* jffs2_do_create() will want to lock it, _after_ reserving 197 space and taking c-alloc_sem. If we keep it locked here, 198 lockdep gets unhappy (although it's a false positive; 199 nothing else will be looking at this inode yet so there's 200 no chance of AB-BA deadlock involving its f->sem). */ 201 mutex_unlock(&f->sem); 202 203 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 204 if (ret) 205 goto fail; 206 207 inode_set_mtime_to_ts(dir_i, 208 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(ri->ctime)))); 209 210 jffs2_free_raw_inode(ri); 211 212 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 213 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 214 f->inocache->pino_nlink, inode->i_mapping->nrpages); 215 216 d_instantiate_new(dentry, inode); 217 return 0; 218 219 fail: 220 iget_failed(inode); 221 jffs2_free_raw_inode(ri); 222 return ret; 223} 224 225/***********************************************************************/ 226 227 228static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 229{ 230 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 231 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 232 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); 233 int ret; 234 uint32_t now = JFFS2_NOW(); 235 236 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 237 dentry->d_name.len, dead_f, now); 238 if (dead_f->inocache) 239 set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); 240 if (!ret) 241 inode_set_mtime_to_ts(dir_i, 242 inode_set_ctime_to_ts(dir_i, ITIME(now))); 243 return ret; 244} 245/***********************************************************************/ 246 247 248static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 249{ 250 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); 251 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 252 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 253 int ret; 254 uint8_t type; 255 uint32_t now; 256 257 /* Don't let people make hard links to bad inodes. */ 258 if (!f->inocache) 259 return -EIO; 260 261 if (d_is_dir(old_dentry)) 262 return -EPERM; 263 264 /* XXX: This is ugly */ 265 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 266 if (!type) type = DT_REG; 267 268 now = JFFS2_NOW(); 269 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 270 271 if (!ret) { 272 mutex_lock(&f->sem); 273 set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); 274 mutex_unlock(&f->sem); 275 d_instantiate(dentry, d_inode(old_dentry)); 276 inode_set_mtime_to_ts(dir_i, 277 inode_set_ctime_to_ts(dir_i, ITIME(now))); 278 ihold(d_inode(old_dentry)); 279 } 280 return ret; 281} 282 283/***********************************************************************/ 284 285static int jffs2_symlink (struct mnt_idmap *idmap, struct inode *dir_i, 286 struct dentry *dentry, const char *target) 287{ 288 struct jffs2_inode_info *f, *dir_f; 289 struct jffs2_sb_info *c; 290 struct inode *inode; 291 struct jffs2_raw_inode *ri; 292 struct jffs2_raw_dirent *rd; 293 struct jffs2_full_dnode *fn; 294 struct jffs2_full_dirent *fd; 295 int namelen; 296 uint32_t alloclen; 297 int ret, targetlen = strlen(target); 298 299 /* FIXME: If you care. We'd need to use frags for the target 300 if it grows much more than this */ 301 if (targetlen > 254) 302 return -ENAMETOOLONG; 303 304 ri = jffs2_alloc_raw_inode(); 305 306 if (!ri) 307 return -ENOMEM; 308 309 c = JFFS2_SB_INFO(dir_i->i_sb); 310 311 /* Try to reserve enough space for both node and dirent. 312 * Just the node will do for now, though 313 */ 314 namelen = dentry->d_name.len; 315 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 316 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 317 318 if (ret) { 319 jffs2_free_raw_inode(ri); 320 return ret; 321 } 322 323 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 324 325 if (IS_ERR(inode)) { 326 jffs2_free_raw_inode(ri); 327 jffs2_complete_reservation(c); 328 return PTR_ERR(inode); 329 } 330 331 inode->i_op = &jffs2_symlink_inode_operations; 332 333 f = JFFS2_INODE_INFO(inode); 334 335 inode->i_size = targetlen; 336 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 337 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 338 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 339 340 ri->compr = JFFS2_COMPR_NONE; 341 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 342 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 343 344 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 345 346 jffs2_free_raw_inode(ri); 347 348 if (IS_ERR(fn)) { 349 /* Eeek. Wave bye bye */ 350 mutex_unlock(&f->sem); 351 jffs2_complete_reservation(c); 352 ret = PTR_ERR(fn); 353 goto fail; 354 } 355 356 /* We use f->target field to store the target path. */ 357 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 358 if (!f->target) { 359 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 360 mutex_unlock(&f->sem); 361 jffs2_complete_reservation(c); 362 ret = -ENOMEM; 363 goto fail; 364 } 365 inode->i_link = f->target; 366 367 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 368 __func__, (char *)f->target); 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 mutex_unlock(&f->sem); 375 376 jffs2_complete_reservation(c); 377 378 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 379 if (ret) 380 goto fail; 381 382 ret = jffs2_init_acl_post(inode); 383 if (ret) 384 goto fail; 385 386 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 387 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 388 if (ret) 389 goto fail; 390 391 rd = jffs2_alloc_raw_dirent(); 392 if (!rd) { 393 /* Argh. Now we treat it like a normal delete */ 394 jffs2_complete_reservation(c); 395 ret = -ENOMEM; 396 goto fail; 397 } 398 399 dir_f = JFFS2_INODE_INFO(dir_i); 400 mutex_lock(&dir_f->sem); 401 402 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 403 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 404 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 405 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 406 407 rd->pino = cpu_to_je32(dir_i->i_ino); 408 rd->version = cpu_to_je32(++dir_f->highest_version); 409 rd->ino = cpu_to_je32(inode->i_ino); 410 rd->mctime = cpu_to_je32(JFFS2_NOW()); 411 rd->nsize = namelen; 412 rd->type = DT_LNK; 413 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 414 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 415 416 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 417 418 if (IS_ERR(fd)) { 419 /* dirent failed to write. Delete the inode normally 420 as if it were the final unlink() */ 421 jffs2_complete_reservation(c); 422 jffs2_free_raw_dirent(rd); 423 mutex_unlock(&dir_f->sem); 424 ret = PTR_ERR(fd); 425 goto fail; 426 } 427 428 inode_set_mtime_to_ts(dir_i, 429 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 430 431 jffs2_free_raw_dirent(rd); 432 433 /* Link the fd into the inode's list, obsoleting an old 434 one if necessary. */ 435 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 436 437 mutex_unlock(&dir_f->sem); 438 jffs2_complete_reservation(c); 439 440 d_instantiate_new(dentry, inode); 441 return 0; 442 443 fail: 444 iget_failed(inode); 445 return ret; 446} 447 448 449static int jffs2_mkdir (struct mnt_idmap *idmap, struct inode *dir_i, 450 struct dentry *dentry, umode_t mode) 451{ 452 struct jffs2_inode_info *f, *dir_f; 453 struct jffs2_sb_info *c; 454 struct inode *inode; 455 struct jffs2_raw_inode *ri; 456 struct jffs2_raw_dirent *rd; 457 struct jffs2_full_dnode *fn; 458 struct jffs2_full_dirent *fd; 459 int namelen; 460 uint32_t alloclen; 461 int ret; 462 463 mode |= S_IFDIR; 464 465 ri = jffs2_alloc_raw_inode(); 466 if (!ri) 467 return -ENOMEM; 468 469 c = JFFS2_SB_INFO(dir_i->i_sb); 470 471 /* Try to reserve enough space for both node and dirent. 472 * Just the node will do for now, though 473 */ 474 namelen = dentry->d_name.len; 475 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 476 JFFS2_SUMMARY_INODE_SIZE); 477 478 if (ret) { 479 jffs2_free_raw_inode(ri); 480 return ret; 481 } 482 483 inode = jffs2_new_inode(dir_i, mode, ri); 484 485 if (IS_ERR(inode)) { 486 jffs2_free_raw_inode(ri); 487 jffs2_complete_reservation(c); 488 return PTR_ERR(inode); 489 } 490 491 inode->i_op = &jffs2_dir_inode_operations; 492 inode->i_fop = &jffs2_dir_operations; 493 494 f = JFFS2_INODE_INFO(inode); 495 496 /* Directories get nlink 2 at start */ 497 set_nlink(inode, 2); 498 /* but ic->pino_nlink is the parent ino# */ 499 f->inocache->pino_nlink = dir_i->i_ino; 500 501 ri->data_crc = cpu_to_je32(0); 502 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 503 504 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 505 506 jffs2_free_raw_inode(ri); 507 508 if (IS_ERR(fn)) { 509 /* Eeek. Wave bye bye */ 510 mutex_unlock(&f->sem); 511 jffs2_complete_reservation(c); 512 ret = PTR_ERR(fn); 513 goto fail; 514 } 515 /* No data here. Only a metadata node, which will be 516 obsoleted by the first data write 517 */ 518 f->metadata = fn; 519 mutex_unlock(&f->sem); 520 521 jffs2_complete_reservation(c); 522 523 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 524 if (ret) 525 goto fail; 526 527 ret = jffs2_init_acl_post(inode); 528 if (ret) 529 goto fail; 530 531 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 532 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 533 if (ret) 534 goto fail; 535 536 rd = jffs2_alloc_raw_dirent(); 537 if (!rd) { 538 /* Argh. Now we treat it like a normal delete */ 539 jffs2_complete_reservation(c); 540 ret = -ENOMEM; 541 goto fail; 542 } 543 544 dir_f = JFFS2_INODE_INFO(dir_i); 545 mutex_lock(&dir_f->sem); 546 547 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 548 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 549 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 550 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 551 552 rd->pino = cpu_to_je32(dir_i->i_ino); 553 rd->version = cpu_to_je32(++dir_f->highest_version); 554 rd->ino = cpu_to_je32(inode->i_ino); 555 rd->mctime = cpu_to_je32(JFFS2_NOW()); 556 rd->nsize = namelen; 557 rd->type = DT_DIR; 558 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 559 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 560 561 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 562 563 if (IS_ERR(fd)) { 564 /* dirent failed to write. Delete the inode normally 565 as if it were the final unlink() */ 566 jffs2_complete_reservation(c); 567 jffs2_free_raw_dirent(rd); 568 mutex_unlock(&dir_f->sem); 569 ret = PTR_ERR(fd); 570 goto fail; 571 } 572 573 inode_set_mtime_to_ts(dir_i, 574 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 575 inc_nlink(dir_i); 576 577 jffs2_free_raw_dirent(rd); 578 579 /* Link the fd into the inode's list, obsoleting an old 580 one if necessary. */ 581 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 582 583 mutex_unlock(&dir_f->sem); 584 jffs2_complete_reservation(c); 585 586 d_instantiate_new(dentry, inode); 587 return 0; 588 589 fail: 590 iget_failed(inode); 591 return ret; 592} 593 594static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 595{ 596 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 597 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 598 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); 599 struct jffs2_full_dirent *fd; 600 int ret; 601 uint32_t now = JFFS2_NOW(); 602 603 mutex_lock(&f->sem); 604 for (fd = f->dents ; fd; fd = fd->next) { 605 if (fd->ino) { 606 mutex_unlock(&f->sem); 607 return -ENOTEMPTY; 608 } 609 } 610 mutex_unlock(&f->sem); 611 612 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 613 dentry->d_name.len, f, now); 614 if (!ret) { 615 inode_set_mtime_to_ts(dir_i, 616 inode_set_ctime_to_ts(dir_i, ITIME(now))); 617 clear_nlink(d_inode(dentry)); 618 drop_nlink(dir_i); 619 } 620 return ret; 621} 622 623static int jffs2_mknod (struct mnt_idmap *idmap, struct inode *dir_i, 624 struct dentry *dentry, umode_t mode, dev_t rdev) 625{ 626 struct jffs2_inode_info *f, *dir_f; 627 struct jffs2_sb_info *c; 628 struct inode *inode; 629 struct jffs2_raw_inode *ri; 630 struct jffs2_raw_dirent *rd; 631 struct jffs2_full_dnode *fn; 632 struct jffs2_full_dirent *fd; 633 int namelen; 634 union jffs2_device_node dev; 635 int devlen = 0; 636 uint32_t alloclen; 637 int ret; 638 639 ri = jffs2_alloc_raw_inode(); 640 if (!ri) 641 return -ENOMEM; 642 643 c = JFFS2_SB_INFO(dir_i->i_sb); 644 645 if (S_ISBLK(mode) || S_ISCHR(mode)) 646 devlen = jffs2_encode_dev(&dev, rdev); 647 648 /* Try to reserve enough space for both node and dirent. 649 * Just the node will do for now, though 650 */ 651 namelen = dentry->d_name.len; 652 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 653 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 654 655 if (ret) { 656 jffs2_free_raw_inode(ri); 657 return ret; 658 } 659 660 inode = jffs2_new_inode(dir_i, mode, ri); 661 662 if (IS_ERR(inode)) { 663 jffs2_free_raw_inode(ri); 664 jffs2_complete_reservation(c); 665 return PTR_ERR(inode); 666 } 667 inode->i_op = &jffs2_file_inode_operations; 668 init_special_inode(inode, inode->i_mode, rdev); 669 670 f = JFFS2_INODE_INFO(inode); 671 672 ri->dsize = ri->csize = cpu_to_je32(devlen); 673 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 674 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 675 676 ri->compr = JFFS2_COMPR_NONE; 677 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 678 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 679 680 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 681 682 jffs2_free_raw_inode(ri); 683 684 if (IS_ERR(fn)) { 685 /* Eeek. Wave bye bye */ 686 mutex_unlock(&f->sem); 687 jffs2_complete_reservation(c); 688 ret = PTR_ERR(fn); 689 goto fail; 690 } 691 /* No data here. Only a metadata node, which will be 692 obsoleted by the first data write 693 */ 694 f->metadata = fn; 695 mutex_unlock(&f->sem); 696 697 jffs2_complete_reservation(c); 698 699 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 700 if (ret) 701 goto fail; 702 703 ret = jffs2_init_acl_post(inode); 704 if (ret) 705 goto fail; 706 707 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 708 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 709 if (ret) 710 goto fail; 711 712 rd = jffs2_alloc_raw_dirent(); 713 if (!rd) { 714 /* Argh. Now we treat it like a normal delete */ 715 jffs2_complete_reservation(c); 716 ret = -ENOMEM; 717 goto fail; 718 } 719 720 dir_f = JFFS2_INODE_INFO(dir_i); 721 mutex_lock(&dir_f->sem); 722 723 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 724 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 725 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 726 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 727 728 rd->pino = cpu_to_je32(dir_i->i_ino); 729 rd->version = cpu_to_je32(++dir_f->highest_version); 730 rd->ino = cpu_to_je32(inode->i_ino); 731 rd->mctime = cpu_to_je32(JFFS2_NOW()); 732 rd->nsize = namelen; 733 734 /* XXX: This is ugly. */ 735 rd->type = (mode & S_IFMT) >> 12; 736 737 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 738 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 739 740 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 741 742 if (IS_ERR(fd)) { 743 /* dirent failed to write. Delete the inode normally 744 as if it were the final unlink() */ 745 jffs2_complete_reservation(c); 746 jffs2_free_raw_dirent(rd); 747 mutex_unlock(&dir_f->sem); 748 ret = PTR_ERR(fd); 749 goto fail; 750 } 751 752 inode_set_mtime_to_ts(dir_i, 753 inode_set_ctime_to_ts(dir_i, ITIME(je32_to_cpu(rd->mctime)))); 754 755 jffs2_free_raw_dirent(rd); 756 757 /* Link the fd into the inode's list, obsoleting an old 758 one if necessary. */ 759 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 760 761 mutex_unlock(&dir_f->sem); 762 jffs2_complete_reservation(c); 763 764 d_instantiate_new(dentry, inode); 765 return 0; 766 767 fail: 768 iget_failed(inode); 769 return ret; 770} 771 772static int jffs2_rename (struct mnt_idmap *idmap, 773 struct inode *old_dir_i, struct dentry *old_dentry, 774 struct inode *new_dir_i, struct dentry *new_dentry, 775 unsigned int flags) 776{ 777 int ret; 778 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 779 struct jffs2_inode_info *victim_f = NULL; 780 uint8_t type; 781 uint32_t now; 782 783 if (flags & ~RENAME_NOREPLACE) 784 return -EINVAL; 785 786 /* The VFS will check for us and prevent trying to rename a 787 * file over a directory and vice versa, but if it's a directory, 788 * the VFS can't check whether the victim is empty. The filesystem 789 * needs to do that for itself. 790 */ 791 if (d_really_is_positive(new_dentry)) { 792 victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); 793 if (d_is_dir(new_dentry)) { 794 struct jffs2_full_dirent *fd; 795 796 mutex_lock(&victim_f->sem); 797 for (fd = victim_f->dents; fd; fd = fd->next) { 798 if (fd->ino) { 799 mutex_unlock(&victim_f->sem); 800 return -ENOTEMPTY; 801 } 802 } 803 mutex_unlock(&victim_f->sem); 804 } 805 } 806 807 /* XXX: We probably ought to alloc enough space for 808 both nodes at the same time. Writing the new link, 809 then getting -ENOSPC, is quite bad :) 810 */ 811 812 /* Make a hard link */ 813 814 /* XXX: This is ugly */ 815 type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; 816 if (!type) type = DT_REG; 817 818 now = JFFS2_NOW(); 819 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 820 d_inode(old_dentry)->i_ino, type, 821 new_dentry->d_name.name, new_dentry->d_name.len, now); 822 823 if (ret) 824 return ret; 825 826 if (victim_f) { 827 /* There was a victim. Kill it off nicely */ 828 if (d_is_dir(new_dentry)) 829 clear_nlink(d_inode(new_dentry)); 830 else 831 drop_nlink(d_inode(new_dentry)); 832 /* Don't oops if the victim was a dirent pointing to an 833 inode which didn't exist. */ 834 if (victim_f->inocache) { 835 mutex_lock(&victim_f->sem); 836 if (d_is_dir(new_dentry)) 837 victim_f->inocache->pino_nlink = 0; 838 else 839 victim_f->inocache->pino_nlink--; 840 mutex_unlock(&victim_f->sem); 841 } 842 } 843 844 /* If it was a directory we moved, and there was no victim, 845 increase i_nlink on its new parent */ 846 if (d_is_dir(old_dentry) && !victim_f) 847 inc_nlink(new_dir_i); 848 849 /* Unlink the original */ 850 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 851 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 852 853 /* We don't touch inode->i_nlink */ 854 855 if (ret) { 856 /* Oh shit. We really ought to make a single node which can do both atomically */ 857 struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); 858 mutex_lock(&f->sem); 859 inc_nlink(d_inode(old_dentry)); 860 if (f->inocache && !d_is_dir(old_dentry)) 861 f->inocache->pino_nlink++; 862 mutex_unlock(&f->sem); 863 864 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 865 __func__, ret); 866 /* 867 * We can't keep the target in dcache after that. 868 * For one thing, we can't afford dentry aliases for directories. 869 * For another, if there was a victim, we _can't_ set new inode 870 * for that sucker and we have to trigger mount eviction - the 871 * caller won't do it on its own since we are returning an error. 872 */ 873 d_invalidate(new_dentry); 874 inode_set_mtime_to_ts(new_dir_i, 875 inode_set_ctime_to_ts(new_dir_i, ITIME(now))); 876 return ret; 877 } 878 879 if (d_is_dir(old_dentry)) 880 drop_nlink(old_dir_i); 881 882 inode_set_mtime_to_ts(old_dir_i, 883 inode_set_ctime_to_ts(old_dir_i, ITIME(now))); 884 inode_set_mtime_to_ts(new_dir_i, 885 inode_set_ctime_to_ts(new_dir_i, ITIME(now))); 886 887 return 0; 888} 889 890