dir.c revision f2963d4551e7f500025d687586a25a09ea28941e
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 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 .iterate = 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 .set_acl = jffs2_set_acl, 63 .setattr = jffs2_setattr, 64 .setxattr = jffs2_setxattr, 65 .getxattr = jffs2_getxattr, 66 .listxattr = jffs2_listxattr, 67 .removexattr = jffs2_removexattr 68}; 69 70/***********************************************************************/ 71 72 73/* We keep the dirent list sorted in increasing order of name hash, 74 and we use the same hash function as the dentries. Makes this 75 nice and simple 76*/ 77static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 78 unsigned int flags) 79{ 80 struct jffs2_inode_info *dir_f; 81 struct jffs2_full_dirent *fd = NULL, *fd_list; 82 uint32_t ino = 0; 83 struct inode *inode = NULL; 84 85 jffs2_dbg(1, "jffs2_lookup()\n"); 86 87 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 88 return ERR_PTR(-ENAMETOOLONG); 89 90 dir_f = JFFS2_INODE_INFO(dir_i); 91 92 mutex_lock(&dir_f->sem); 93 94 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 95 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 96 if (fd_list->nhash == target->d_name.hash && 97 (!fd || fd_list->version > fd->version) && 98 strlen(fd_list->name) == target->d_name.len && 99 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 100 fd = fd_list; 101 } 102 } 103 if (fd) 104 ino = fd->ino; 105 mutex_unlock(&dir_f->sem); 106 if (ino) { 107 inode = jffs2_iget(dir_i->i_sb, ino); 108 if (IS_ERR(inode)) 109 pr_warn("iget() failed for ino #%u\n", ino); 110 } 111 112 return d_splice_alias(inode, target); 113} 114 115/***********************************************************************/ 116 117 118static int jffs2_readdir(struct file *file, struct dir_context *ctx) 119{ 120 struct inode *inode = file_inode(file); 121 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); 122 struct jffs2_full_dirent *fd; 123 unsigned long curofs = 1; 124 125 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); 126 127 if (!dir_emit_dots(file, ctx)) 128 return 0; 129 130 mutex_lock(&f->sem); 131 for (fd = f->dents; fd; fd = fd->next) { 132 curofs++; 133 /* First loop: curofs = 2; pos = 2 */ 134 if (curofs < ctx->pos) { 135 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 136 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); 137 continue; 138 } 139 if (!fd->ino) { 140 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", 141 fd->name); 142 ctx->pos++; 143 continue; 144 } 145 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", 146 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); 147 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) 148 break; 149 ctx->pos++; 150 } 151 mutex_unlock(&f->sem); 152 return 0; 153} 154 155/***********************************************************************/ 156 157 158static int jffs2_create(struct inode *dir_i, struct dentry *dentry, 159 umode_t mode, bool excl) 160{ 161 struct jffs2_raw_inode *ri; 162 struct jffs2_inode_info *f, *dir_f; 163 struct jffs2_sb_info *c; 164 struct inode *inode; 165 int ret; 166 167 ri = jffs2_alloc_raw_inode(); 168 if (!ri) 169 return -ENOMEM; 170 171 c = JFFS2_SB_INFO(dir_i->i_sb); 172 173 jffs2_dbg(1, "%s()\n", __func__); 174 175 inode = jffs2_new_inode(dir_i, mode, ri); 176 177 if (IS_ERR(inode)) { 178 jffs2_dbg(1, "jffs2_new_inode() failed\n"); 179 jffs2_free_raw_inode(ri); 180 return PTR_ERR(inode); 181 } 182 183 inode->i_op = &jffs2_file_inode_operations; 184 inode->i_fop = &jffs2_file_operations; 185 inode->i_mapping->a_ops = &jffs2_file_address_operations; 186 inode->i_mapping->nrpages = 0; 187 188 f = JFFS2_INODE_INFO(inode); 189 dir_f = JFFS2_INODE_INFO(dir_i); 190 191 /* jffs2_do_create() will want to lock it, _after_ reserving 192 space and taking c-alloc_sem. If we keep it locked here, 193 lockdep gets unhappy (although it's a false positive; 194 nothing else will be looking at this inode yet so there's 195 no chance of AB-BA deadlock involving its f->sem). */ 196 mutex_unlock(&f->sem); 197 198 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); 199 if (ret) 200 goto fail; 201 202 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 203 204 jffs2_free_raw_inode(ri); 205 206 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 207 __func__, inode->i_ino, inode->i_mode, inode->i_nlink, 208 f->inocache->pino_nlink, inode->i_mapping->nrpages); 209 210 unlock_new_inode(inode); 211 d_instantiate(dentry, inode); 212 return 0; 213 214 fail: 215 iget_failed(inode); 216 jffs2_free_raw_inode(ri); 217 return ret; 218} 219 220/***********************************************************************/ 221 222 223static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 224{ 225 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 226 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 227 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 228 int ret; 229 uint32_t now = get_seconds(); 230 231 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 232 dentry->d_name.len, dead_f, now); 233 if (dead_f->inocache) 234 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink); 235 if (!ret) 236 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 237 return ret; 238} 239/***********************************************************************/ 240 241 242static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 243{ 244 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 245 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 247 int ret; 248 uint8_t type; 249 uint32_t now; 250 251 /* Don't let people make hard links to bad inodes. */ 252 if (!f->inocache) 253 return -EIO; 254 255 if (S_ISDIR(old_dentry->d_inode->i_mode)) 256 return -EPERM; 257 258 /* XXX: This is ugly */ 259 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 260 if (!type) type = DT_REG; 261 262 now = get_seconds(); 263 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 264 265 if (!ret) { 266 mutex_lock(&f->sem); 267 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink); 268 mutex_unlock(&f->sem); 269 d_instantiate(dentry, old_dentry->d_inode); 270 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 271 ihold(old_dentry->d_inode); 272 } 273 return ret; 274} 275 276/***********************************************************************/ 277 278static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 279{ 280 struct jffs2_inode_info *f, *dir_f; 281 struct jffs2_sb_info *c; 282 struct inode *inode; 283 struct jffs2_raw_inode *ri; 284 struct jffs2_raw_dirent *rd; 285 struct jffs2_full_dnode *fn; 286 struct jffs2_full_dirent *fd; 287 int namelen; 288 uint32_t alloclen; 289 int ret, targetlen = strlen(target); 290 291 /* FIXME: If you care. We'd need to use frags for the target 292 if it grows much more than this */ 293 if (targetlen > 254) 294 return -ENAMETOOLONG; 295 296 ri = jffs2_alloc_raw_inode(); 297 298 if (!ri) 299 return -ENOMEM; 300 301 c = JFFS2_SB_INFO(dir_i->i_sb); 302 303 /* Try to reserve enough space for both node and dirent. 304 * Just the node will do for now, though 305 */ 306 namelen = dentry->d_name.len; 307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 308 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 309 310 if (ret) { 311 jffs2_free_raw_inode(ri); 312 return ret; 313 } 314 315 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 316 317 if (IS_ERR(inode)) { 318 jffs2_free_raw_inode(ri); 319 jffs2_complete_reservation(c); 320 return PTR_ERR(inode); 321 } 322 323 inode->i_op = &jffs2_symlink_inode_operations; 324 325 f = JFFS2_INODE_INFO(inode); 326 327 inode->i_size = targetlen; 328 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 329 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 330 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 331 332 ri->compr = JFFS2_COMPR_NONE; 333 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 334 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 335 336 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 337 338 jffs2_free_raw_inode(ri); 339 340 if (IS_ERR(fn)) { 341 /* Eeek. Wave bye bye */ 342 mutex_unlock(&f->sem); 343 jffs2_complete_reservation(c); 344 ret = PTR_ERR(fn); 345 goto fail; 346 } 347 348 /* We use f->target field to store the target path. */ 349 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); 350 if (!f->target) { 351 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); 352 mutex_unlock(&f->sem); 353 jffs2_complete_reservation(c); 354 ret = -ENOMEM; 355 goto fail; 356 } 357 358 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", 359 __func__, (char *)f->target); 360 361 /* No data here. Only a metadata node, which will be 362 obsoleted by the first data write 363 */ 364 f->metadata = fn; 365 mutex_unlock(&f->sem); 366 367 jffs2_complete_reservation(c); 368 369 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 370 if (ret) 371 goto fail; 372 373 ret = jffs2_init_acl_post(inode); 374 if (ret) 375 goto fail; 376 377 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 378 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 379 if (ret) 380 goto fail; 381 382 rd = jffs2_alloc_raw_dirent(); 383 if (!rd) { 384 /* Argh. Now we treat it like a normal delete */ 385 jffs2_complete_reservation(c); 386 ret = -ENOMEM; 387 goto fail; 388 } 389 390 dir_f = JFFS2_INODE_INFO(dir_i); 391 mutex_lock(&dir_f->sem); 392 393 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 394 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 395 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 396 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 397 398 rd->pino = cpu_to_je32(dir_i->i_ino); 399 rd->version = cpu_to_je32(++dir_f->highest_version); 400 rd->ino = cpu_to_je32(inode->i_ino); 401 rd->mctime = cpu_to_je32(get_seconds()); 402 rd->nsize = namelen; 403 rd->type = DT_LNK; 404 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 405 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 406 407 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 408 409 if (IS_ERR(fd)) { 410 /* dirent failed to write. Delete the inode normally 411 as if it were the final unlink() */ 412 jffs2_complete_reservation(c); 413 jffs2_free_raw_dirent(rd); 414 mutex_unlock(&dir_f->sem); 415 ret = PTR_ERR(fd); 416 goto fail; 417 } 418 419 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 420 421 jffs2_free_raw_dirent(rd); 422 423 /* Link the fd into the inode's list, obsoleting an old 424 one if necessary. */ 425 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 426 427 mutex_unlock(&dir_f->sem); 428 jffs2_complete_reservation(c); 429 430 unlock_new_inode(inode); 431 d_instantiate(dentry, inode); 432 return 0; 433 434 fail: 435 iget_failed(inode); 436 return ret; 437} 438 439 440static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) 441{ 442 struct jffs2_inode_info *f, *dir_f; 443 struct jffs2_sb_info *c; 444 struct inode *inode; 445 struct jffs2_raw_inode *ri; 446 struct jffs2_raw_dirent *rd; 447 struct jffs2_full_dnode *fn; 448 struct jffs2_full_dirent *fd; 449 int namelen; 450 uint32_t alloclen; 451 int ret; 452 453 mode |= S_IFDIR; 454 455 ri = jffs2_alloc_raw_inode(); 456 if (!ri) 457 return -ENOMEM; 458 459 c = JFFS2_SB_INFO(dir_i->i_sb); 460 461 /* Try to reserve enough space for both node and dirent. 462 * Just the node will do for now, though 463 */ 464 namelen = dentry->d_name.len; 465 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 466 JFFS2_SUMMARY_INODE_SIZE); 467 468 if (ret) { 469 jffs2_free_raw_inode(ri); 470 return ret; 471 } 472 473 inode = jffs2_new_inode(dir_i, mode, ri); 474 475 if (IS_ERR(inode)) { 476 jffs2_free_raw_inode(ri); 477 jffs2_complete_reservation(c); 478 return PTR_ERR(inode); 479 } 480 481 inode->i_op = &jffs2_dir_inode_operations; 482 inode->i_fop = &jffs2_dir_operations; 483 484 f = JFFS2_INODE_INFO(inode); 485 486 /* Directories get nlink 2 at start */ 487 set_nlink(inode, 2); 488 /* but ic->pino_nlink is the parent ino# */ 489 f->inocache->pino_nlink = dir_i->i_ino; 490 491 ri->data_crc = cpu_to_je32(0); 492 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 493 494 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 495 496 jffs2_free_raw_inode(ri); 497 498 if (IS_ERR(fn)) { 499 /* Eeek. Wave bye bye */ 500 mutex_unlock(&f->sem); 501 jffs2_complete_reservation(c); 502 ret = PTR_ERR(fn); 503 goto fail; 504 } 505 /* No data here. Only a metadata node, which will be 506 obsoleted by the first data write 507 */ 508 f->metadata = fn; 509 mutex_unlock(&f->sem); 510 511 jffs2_complete_reservation(c); 512 513 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 514 if (ret) 515 goto fail; 516 517 ret = jffs2_init_acl_post(inode); 518 if (ret) 519 goto fail; 520 521 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 522 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 523 if (ret) 524 goto fail; 525 526 rd = jffs2_alloc_raw_dirent(); 527 if (!rd) { 528 /* Argh. Now we treat it like a normal delete */ 529 jffs2_complete_reservation(c); 530 ret = -ENOMEM; 531 goto fail; 532 } 533 534 dir_f = JFFS2_INODE_INFO(dir_i); 535 mutex_lock(&dir_f->sem); 536 537 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 538 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 539 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 540 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 541 542 rd->pino = cpu_to_je32(dir_i->i_ino); 543 rd->version = cpu_to_je32(++dir_f->highest_version); 544 rd->ino = cpu_to_je32(inode->i_ino); 545 rd->mctime = cpu_to_je32(get_seconds()); 546 rd->nsize = namelen; 547 rd->type = DT_DIR; 548 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 549 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 550 551 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 552 553 if (IS_ERR(fd)) { 554 /* dirent failed to write. Delete the inode normally 555 as if it were the final unlink() */ 556 jffs2_complete_reservation(c); 557 jffs2_free_raw_dirent(rd); 558 mutex_unlock(&dir_f->sem); 559 ret = PTR_ERR(fd); 560 goto fail; 561 } 562 563 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 564 inc_nlink(dir_i); 565 566 jffs2_free_raw_dirent(rd); 567 568 /* Link the fd into the inode's list, obsoleting an old 569 one if necessary. */ 570 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 571 572 mutex_unlock(&dir_f->sem); 573 jffs2_complete_reservation(c); 574 575 unlock_new_inode(inode); 576 d_instantiate(dentry, inode); 577 return 0; 578 579 fail: 580 iget_failed(inode); 581 return ret; 582} 583 584static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 585{ 586 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 587 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 588 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 589 struct jffs2_full_dirent *fd; 590 int ret; 591 uint32_t now = get_seconds(); 592 593 for (fd = f->dents ; fd; fd = fd->next) { 594 if (fd->ino) 595 return -ENOTEMPTY; 596 } 597 598 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 599 dentry->d_name.len, f, now); 600 if (!ret) { 601 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 602 clear_nlink(dentry->d_inode); 603 drop_nlink(dir_i); 604 } 605 return ret; 606} 607 608static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) 609{ 610 struct jffs2_inode_info *f, *dir_f; 611 struct jffs2_sb_info *c; 612 struct inode *inode; 613 struct jffs2_raw_inode *ri; 614 struct jffs2_raw_dirent *rd; 615 struct jffs2_full_dnode *fn; 616 struct jffs2_full_dirent *fd; 617 int namelen; 618 union jffs2_device_node dev; 619 int devlen = 0; 620 uint32_t alloclen; 621 int ret; 622 623 if (!new_valid_dev(rdev)) 624 return -EINVAL; 625 626 ri = jffs2_alloc_raw_inode(); 627 if (!ri) 628 return -ENOMEM; 629 630 c = JFFS2_SB_INFO(dir_i->i_sb); 631 632 if (S_ISBLK(mode) || S_ISCHR(mode)) 633 devlen = jffs2_encode_dev(&dev, rdev); 634 635 /* Try to reserve enough space for both node and dirent. 636 * Just the node will do for now, though 637 */ 638 namelen = dentry->d_name.len; 639 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 640 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 641 642 if (ret) { 643 jffs2_free_raw_inode(ri); 644 return ret; 645 } 646 647 inode = jffs2_new_inode(dir_i, mode, ri); 648 649 if (IS_ERR(inode)) { 650 jffs2_free_raw_inode(ri); 651 jffs2_complete_reservation(c); 652 return PTR_ERR(inode); 653 } 654 inode->i_op = &jffs2_file_inode_operations; 655 init_special_inode(inode, inode->i_mode, rdev); 656 657 f = JFFS2_INODE_INFO(inode); 658 659 ri->dsize = ri->csize = cpu_to_je32(devlen); 660 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 661 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 662 663 ri->compr = JFFS2_COMPR_NONE; 664 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 665 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 666 667 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 668 669 jffs2_free_raw_inode(ri); 670 671 if (IS_ERR(fn)) { 672 /* Eeek. Wave bye bye */ 673 mutex_unlock(&f->sem); 674 jffs2_complete_reservation(c); 675 ret = PTR_ERR(fn); 676 goto fail; 677 } 678 /* No data here. Only a metadata node, which will be 679 obsoleted by the first data write 680 */ 681 f->metadata = fn; 682 mutex_unlock(&f->sem); 683 684 jffs2_complete_reservation(c); 685 686 ret = jffs2_init_security(inode, dir_i, &dentry->d_name); 687 if (ret) 688 goto fail; 689 690 ret = jffs2_init_acl_post(inode); 691 if (ret) 692 goto fail; 693 694 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 695 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 696 if (ret) 697 goto fail; 698 699 rd = jffs2_alloc_raw_dirent(); 700 if (!rd) { 701 /* Argh. Now we treat it like a normal delete */ 702 jffs2_complete_reservation(c); 703 ret = -ENOMEM; 704 goto fail; 705 } 706 707 dir_f = JFFS2_INODE_INFO(dir_i); 708 mutex_lock(&dir_f->sem); 709 710 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 711 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 712 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 713 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 714 715 rd->pino = cpu_to_je32(dir_i->i_ino); 716 rd->version = cpu_to_je32(++dir_f->highest_version); 717 rd->ino = cpu_to_je32(inode->i_ino); 718 rd->mctime = cpu_to_je32(get_seconds()); 719 rd->nsize = namelen; 720 721 /* XXX: This is ugly. */ 722 rd->type = (mode & S_IFMT) >> 12; 723 724 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 725 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 726 727 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 728 729 if (IS_ERR(fd)) { 730 /* dirent failed to write. Delete the inode normally 731 as if it were the final unlink() */ 732 jffs2_complete_reservation(c); 733 jffs2_free_raw_dirent(rd); 734 mutex_unlock(&dir_f->sem); 735 ret = PTR_ERR(fd); 736 goto fail; 737 } 738 739 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 740 741 jffs2_free_raw_dirent(rd); 742 743 /* Link the fd into the inode's list, obsoleting an old 744 one if necessary. */ 745 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 746 747 mutex_unlock(&dir_f->sem); 748 jffs2_complete_reservation(c); 749 750 unlock_new_inode(inode); 751 d_instantiate(dentry, inode); 752 return 0; 753 754 fail: 755 iget_failed(inode); 756 return ret; 757} 758 759static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 760 struct inode *new_dir_i, struct dentry *new_dentry) 761{ 762 int ret; 763 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 764 struct jffs2_inode_info *victim_f = NULL; 765 uint8_t type; 766 uint32_t now; 767 768 /* The VFS will check for us and prevent trying to rename a 769 * file over a directory and vice versa, but if it's a directory, 770 * the VFS can't check whether the victim is empty. The filesystem 771 * needs to do that for itself. 772 */ 773 if (new_dentry->d_inode) { 774 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 775 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 776 struct jffs2_full_dirent *fd; 777 778 mutex_lock(&victim_f->sem); 779 for (fd = victim_f->dents; fd; fd = fd->next) { 780 if (fd->ino) { 781 mutex_unlock(&victim_f->sem); 782 return -ENOTEMPTY; 783 } 784 } 785 mutex_unlock(&victim_f->sem); 786 } 787 } 788 789 /* XXX: We probably ought to alloc enough space for 790 both nodes at the same time. Writing the new link, 791 then getting -ENOSPC, is quite bad :) 792 */ 793 794 /* Make a hard link */ 795 796 /* XXX: This is ugly */ 797 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 798 if (!type) type = DT_REG; 799 800 now = get_seconds(); 801 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 802 old_dentry->d_inode->i_ino, type, 803 new_dentry->d_name.name, new_dentry->d_name.len, now); 804 805 if (ret) 806 return ret; 807 808 if (victim_f) { 809 /* There was a victim. Kill it off nicely */ 810 if (S_ISDIR(new_dentry->d_inode->i_mode)) 811 clear_nlink(new_dentry->d_inode); 812 else 813 drop_nlink(new_dentry->d_inode); 814 /* Don't oops if the victim was a dirent pointing to an 815 inode which didn't exist. */ 816 if (victim_f->inocache) { 817 mutex_lock(&victim_f->sem); 818 if (S_ISDIR(new_dentry->d_inode->i_mode)) 819 victim_f->inocache->pino_nlink = 0; 820 else 821 victim_f->inocache->pino_nlink--; 822 mutex_unlock(&victim_f->sem); 823 } 824 } 825 826 /* If it was a directory we moved, and there was no victim, 827 increase i_nlink on its new parent */ 828 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 829 inc_nlink(new_dir_i); 830 831 /* Unlink the original */ 832 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 833 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 834 835 /* We don't touch inode->i_nlink */ 836 837 if (ret) { 838 /* Oh shit. We really ought to make a single node which can do both atomically */ 839 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 840 mutex_lock(&f->sem); 841 inc_nlink(old_dentry->d_inode); 842 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 843 f->inocache->pino_nlink++; 844 mutex_unlock(&f->sem); 845 846 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", 847 __func__, ret); 848 /* Might as well let the VFS know */ 849 d_instantiate(new_dentry, old_dentry->d_inode); 850 ihold(old_dentry->d_inode); 851 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 852 return ret; 853 } 854 855 if (S_ISDIR(old_dentry->d_inode->i_mode)) 856 drop_nlink(old_dir_i); 857 858 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 859 860 return 0; 861} 862 863