dir.c revision 0533400b7813df6c22a171499434d30bd57e799c
1/* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2001-2007 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 */ 11 12#include <linux/kernel.h> 13#include <linux/slab.h> 14#include <linux/fs.h> 15#include <linux/crc32.h> 16#include <linux/jffs2.h> 17#include "jffs2_fs_i.h" 18#include "jffs2_fs_sb.h" 19#include <linux/time.h> 20#include "nodelist.h" 21 22static int jffs2_readdir (struct file *, void *, filldir_t); 23 24static int jffs2_create (struct inode *,struct dentry *,int, 25 struct nameidata *); 26static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 27 struct nameidata *); 28static int jffs2_link (struct dentry *,struct inode *,struct dentry *); 29static int jffs2_unlink (struct inode *,struct dentry *); 30static int jffs2_symlink (struct inode *,struct dentry *,const char *); 31static int jffs2_mkdir (struct inode *,struct dentry *,int); 32static int jffs2_rmdir (struct inode *,struct dentry *); 33static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t); 34static int jffs2_rename (struct inode *, struct dentry *, 35 struct inode *, struct dentry *); 36 37const struct file_operations jffs2_dir_operations = 38{ 39 .read = generic_read_dir, 40 .readdir = jffs2_readdir, 41 .unlocked_ioctl=jffs2_ioctl, 42 .fsync = jffs2_fsync 43}; 44 45 46const struct inode_operations jffs2_dir_inode_operations = 47{ 48 .create = jffs2_create, 49 .lookup = jffs2_lookup, 50 .link = jffs2_link, 51 .unlink = jffs2_unlink, 52 .symlink = jffs2_symlink, 53 .mkdir = jffs2_mkdir, 54 .rmdir = jffs2_rmdir, 55 .mknod = jffs2_mknod, 56 .rename = jffs2_rename, 57 .permission = jffs2_permission, 58 .setattr = jffs2_setattr, 59 .setxattr = jffs2_setxattr, 60 .getxattr = jffs2_getxattr, 61 .listxattr = jffs2_listxattr, 62 .removexattr = jffs2_removexattr 63}; 64 65/***********************************************************************/ 66 67 68/* We keep the dirent list sorted in increasing order of name hash, 69 and we use the same hash function as the dentries. Makes this 70 nice and simple 71*/ 72static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 73 struct nameidata *nd) 74{ 75 struct jffs2_inode_info *dir_f; 76 struct jffs2_sb_info *c; 77 struct jffs2_full_dirent *fd = NULL, *fd_list; 78 uint32_t ino = 0; 79 struct inode *inode = NULL; 80 81 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 82 83 if (target->d_name.len > JFFS2_MAX_NAME_LEN) 84 return ERR_PTR(-ENAMETOOLONG); 85 86 dir_f = JFFS2_INODE_INFO(dir_i); 87 c = JFFS2_SB_INFO(dir_i->i_sb); 88 89 mutex_lock(&dir_f->sem); 90 91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 93 if (fd_list->nhash == target->d_name.hash && 94 (!fd || fd_list->version > fd->version) && 95 strlen(fd_list->name) == target->d_name.len && 96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 97 fd = fd_list; 98 } 99 } 100 if (fd) 101 ino = fd->ino; 102 mutex_unlock(&dir_f->sem); 103 if (ino) { 104 inode = jffs2_iget(dir_i->i_sb, ino); 105 if (IS_ERR(inode)) { 106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 107 return ERR_CAST(inode); 108 } 109 } 110 111 d_add(target, inode); 112 113 return NULL; 114} 115 116/***********************************************************************/ 117 118 119static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 120{ 121 struct jffs2_inode_info *f; 122 struct jffs2_sb_info *c; 123 struct inode *inode = filp->f_path.dentry->d_inode; 124 struct jffs2_full_dirent *fd; 125 unsigned long offset, curofs; 126 127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 128 129 f = JFFS2_INODE_INFO(inode); 130 c = JFFS2_SB_INFO(inode->i_sb); 131 132 offset = filp->f_pos; 133 134 if (offset == 0) { 135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 137 goto out; 138 offset++; 139 } 140 if (offset == 1) { 141 unsigned long pino = parent_ino(filp->f_path.dentry); 142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 144 goto out; 145 offset++; 146 } 147 148 curofs=1; 149 mutex_lock(&f->sem); 150 for (fd = f->dents; fd; fd = fd->next) { 151 152 curofs++; 153 /* First loop: curofs = 2; offset = 2 */ 154 if (curofs < offset) { 155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 156 fd->name, fd->ino, fd->type, curofs, offset)); 157 continue; 158 } 159 if (!fd->ino) { 160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 161 offset++; 162 continue; 163 } 164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 166 break; 167 offset++; 168 } 169 mutex_unlock(&f->sem); 170 out: 171 filp->f_pos = offset; 172 return 0; 173} 174 175/***********************************************************************/ 176 177 178static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 179 struct nameidata *nd) 180{ 181 struct jffs2_raw_inode *ri; 182 struct jffs2_inode_info *f, *dir_f; 183 struct jffs2_sb_info *c; 184 struct inode *inode; 185 int ret; 186 187 ri = jffs2_alloc_raw_inode(); 188 if (!ri) 189 return -ENOMEM; 190 191 c = JFFS2_SB_INFO(dir_i->i_sb); 192 193 D1(printk(KERN_DEBUG "jffs2_create()\n")); 194 195 inode = jffs2_new_inode(dir_i, mode, ri); 196 197 if (IS_ERR(inode)) { 198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 199 jffs2_free_raw_inode(ri); 200 return PTR_ERR(inode); 201 } 202 203 inode->i_op = &jffs2_file_inode_operations; 204 inode->i_fop = &jffs2_file_operations; 205 inode->i_mapping->a_ops = &jffs2_file_address_operations; 206 inode->i_mapping->nrpages = 0; 207 208 f = JFFS2_INODE_INFO(inode); 209 dir_f = JFFS2_INODE_INFO(dir_i); 210 211 /* jffs2_do_create() will want to lock it, _after_ reserving 212 space and taking c-alloc_sem. If we keep it locked here, 213 lockdep gets unhappy (although it's a false positive; 214 nothing else will be looking at this inode yet so there's 215 no chance of AB-BA deadlock involving its f->sem). */ 216 mutex_unlock(&f->sem); 217 218 ret = jffs2_do_create(c, dir_f, f, ri, 219 dentry->d_name.name, dentry->d_name.len); 220 if (ret) 221 goto fail; 222 223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 224 225 jffs2_free_raw_inode(ri); 226 d_instantiate(dentry, inode); 227 228 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 229 inode->i_ino, inode->i_mode, inode->i_nlink, 230 f->inocache->pino_nlink, inode->i_mapping->nrpages)); 231 return 0; 232 233 fail: 234 make_bad_inode(inode); 235 iput(inode); 236 jffs2_free_raw_inode(ri); 237 return ret; 238} 239 240/***********************************************************************/ 241 242 243static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 244{ 245 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 247 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 248 int ret; 249 uint32_t now = get_seconds(); 250 251 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 252 dentry->d_name.len, dead_f, now); 253 if (dead_f->inocache) 254 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink; 255 if (!ret) 256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 257 return ret; 258} 259/***********************************************************************/ 260 261 262static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 263{ 264 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 265 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 266 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 267 int ret; 268 uint8_t type; 269 uint32_t now; 270 271 /* Don't let people make hard links to bad inodes. */ 272 if (!f->inocache) 273 return -EIO; 274 275 if (S_ISDIR(old_dentry->d_inode->i_mode)) 276 return -EPERM; 277 278 /* XXX: This is ugly */ 279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 280 if (!type) type = DT_REG; 281 282 now = get_seconds(); 283 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 284 285 if (!ret) { 286 mutex_lock(&f->sem); 287 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink; 288 mutex_unlock(&f->sem); 289 d_instantiate(dentry, old_dentry->d_inode); 290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 291 atomic_inc(&old_dentry->d_inode->i_count); 292 } 293 return ret; 294} 295 296/***********************************************************************/ 297 298static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 299{ 300 struct jffs2_inode_info *f, *dir_f; 301 struct jffs2_sb_info *c; 302 struct inode *inode; 303 struct jffs2_raw_inode *ri; 304 struct jffs2_raw_dirent *rd; 305 struct jffs2_full_dnode *fn; 306 struct jffs2_full_dirent *fd; 307 int namelen; 308 uint32_t alloclen; 309 int ret, targetlen = strlen(target); 310 311 /* FIXME: If you care. We'd need to use frags for the target 312 if it grows much more than this */ 313 if (targetlen > 254) 314 return -EINVAL; 315 316 ri = jffs2_alloc_raw_inode(); 317 318 if (!ri) 319 return -ENOMEM; 320 321 c = JFFS2_SB_INFO(dir_i->i_sb); 322 323 /* Try to reserve enough space for both node and dirent. 324 * Just the node will do for now, though 325 */ 326 namelen = dentry->d_name.len; 327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 329 330 if (ret) { 331 jffs2_free_raw_inode(ri); 332 return ret; 333 } 334 335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 336 337 if (IS_ERR(inode)) { 338 jffs2_free_raw_inode(ri); 339 jffs2_complete_reservation(c); 340 return PTR_ERR(inode); 341 } 342 343 inode->i_op = &jffs2_symlink_inode_operations; 344 345 f = JFFS2_INODE_INFO(inode); 346 347 inode->i_size = targetlen; 348 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 349 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 350 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 351 352 ri->compr = JFFS2_COMPR_NONE; 353 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 354 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 355 356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 357 358 jffs2_free_raw_inode(ri); 359 360 if (IS_ERR(fn)) { 361 /* Eeek. Wave bye bye */ 362 mutex_unlock(&f->sem); 363 jffs2_complete_reservation(c); 364 jffs2_clear_inode(inode); 365 return PTR_ERR(fn); 366 } 367 368 /* We use f->target field to store the target path. */ 369 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 370 if (!f->target) { 371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 372 mutex_unlock(&f->sem); 373 jffs2_complete_reservation(c); 374 jffs2_clear_inode(inode); 375 return -ENOMEM; 376 } 377 378 memcpy(f->target, target, targetlen + 1); 379 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 380 381 /* No data here. Only a metadata node, which will be 382 obsoleted by the first data write 383 */ 384 f->metadata = fn; 385 mutex_unlock(&f->sem); 386 387 jffs2_complete_reservation(c); 388 389 ret = jffs2_init_security(inode, dir_i); 390 if (ret) { 391 jffs2_clear_inode(inode); 392 return ret; 393 } 394 ret = jffs2_init_acl_post(inode); 395 if (ret) { 396 jffs2_clear_inode(inode); 397 return ret; 398 } 399 400 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 401 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 402 if (ret) { 403 /* Eep. */ 404 jffs2_clear_inode(inode); 405 return ret; 406 } 407 408 rd = jffs2_alloc_raw_dirent(); 409 if (!rd) { 410 /* Argh. Now we treat it like a normal delete */ 411 jffs2_complete_reservation(c); 412 jffs2_clear_inode(inode); 413 return -ENOMEM; 414 } 415 416 dir_f = JFFS2_INODE_INFO(dir_i); 417 mutex_lock(&dir_f->sem); 418 419 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 420 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 421 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 422 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 423 424 rd->pino = cpu_to_je32(dir_i->i_ino); 425 rd->version = cpu_to_je32(++dir_f->highest_version); 426 rd->ino = cpu_to_je32(inode->i_ino); 427 rd->mctime = cpu_to_je32(get_seconds()); 428 rd->nsize = namelen; 429 rd->type = DT_LNK; 430 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 431 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 432 433 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 434 435 if (IS_ERR(fd)) { 436 /* dirent failed to write. Delete the inode normally 437 as if it were the final unlink() */ 438 jffs2_complete_reservation(c); 439 jffs2_free_raw_dirent(rd); 440 mutex_unlock(&dir_f->sem); 441 jffs2_clear_inode(inode); 442 return PTR_ERR(fd); 443 } 444 445 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 446 447 jffs2_free_raw_dirent(rd); 448 449 /* Link the fd into the inode's list, obsoleting an old 450 one if necessary. */ 451 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 452 453 mutex_unlock(&dir_f->sem); 454 jffs2_complete_reservation(c); 455 456 d_instantiate(dentry, inode); 457 return 0; 458} 459 460 461static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 462{ 463 struct jffs2_inode_info *f, *dir_f; 464 struct jffs2_sb_info *c; 465 struct inode *inode; 466 struct jffs2_raw_inode *ri; 467 struct jffs2_raw_dirent *rd; 468 struct jffs2_full_dnode *fn; 469 struct jffs2_full_dirent *fd; 470 int namelen; 471 uint32_t alloclen; 472 int ret; 473 474 mode |= S_IFDIR; 475 476 ri = jffs2_alloc_raw_inode(); 477 if (!ri) 478 return -ENOMEM; 479 480 c = JFFS2_SB_INFO(dir_i->i_sb); 481 482 /* Try to reserve enough space for both node and dirent. 483 * Just the node will do for now, though 484 */ 485 namelen = dentry->d_name.len; 486 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 487 JFFS2_SUMMARY_INODE_SIZE); 488 489 if (ret) { 490 jffs2_free_raw_inode(ri); 491 return ret; 492 } 493 494 inode = jffs2_new_inode(dir_i, mode, ri); 495 496 if (IS_ERR(inode)) { 497 jffs2_free_raw_inode(ri); 498 jffs2_complete_reservation(c); 499 return PTR_ERR(inode); 500 } 501 502 inode->i_op = &jffs2_dir_inode_operations; 503 inode->i_fop = &jffs2_dir_operations; 504 505 f = JFFS2_INODE_INFO(inode); 506 507 /* Directories get nlink 2 at start */ 508 inode->i_nlink = 2; 509 /* but ic->pino_nlink is the parent ino# */ 510 f->inocache->pino_nlink = dir_i->i_ino; 511 512 ri->data_crc = cpu_to_je32(0); 513 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 514 515 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); 516 517 jffs2_free_raw_inode(ri); 518 519 if (IS_ERR(fn)) { 520 /* Eeek. Wave bye bye */ 521 mutex_unlock(&f->sem); 522 jffs2_complete_reservation(c); 523 jffs2_clear_inode(inode); 524 return PTR_ERR(fn); 525 } 526 /* No data here. Only a metadata node, which will be 527 obsoleted by the first data write 528 */ 529 f->metadata = fn; 530 mutex_unlock(&f->sem); 531 532 jffs2_complete_reservation(c); 533 534 ret = jffs2_init_security(inode, dir_i); 535 if (ret) { 536 jffs2_clear_inode(inode); 537 return ret; 538 } 539 ret = jffs2_init_acl_post(inode); 540 if (ret) { 541 jffs2_clear_inode(inode); 542 return ret; 543 } 544 545 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 546 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 547 if (ret) { 548 /* Eep. */ 549 jffs2_clear_inode(inode); 550 return ret; 551 } 552 553 rd = jffs2_alloc_raw_dirent(); 554 if (!rd) { 555 /* Argh. Now we treat it like a normal delete */ 556 jffs2_complete_reservation(c); 557 jffs2_clear_inode(inode); 558 return -ENOMEM; 559 } 560 561 dir_f = JFFS2_INODE_INFO(dir_i); 562 mutex_lock(&dir_f->sem); 563 564 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 565 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 566 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 567 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 568 569 rd->pino = cpu_to_je32(dir_i->i_ino); 570 rd->version = cpu_to_je32(++dir_f->highest_version); 571 rd->ino = cpu_to_je32(inode->i_ino); 572 rd->mctime = cpu_to_je32(get_seconds()); 573 rd->nsize = namelen; 574 rd->type = DT_DIR; 575 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 576 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 577 578 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 579 580 if (IS_ERR(fd)) { 581 /* dirent failed to write. Delete the inode normally 582 as if it were the final unlink() */ 583 jffs2_complete_reservation(c); 584 jffs2_free_raw_dirent(rd); 585 mutex_unlock(&dir_f->sem); 586 jffs2_clear_inode(inode); 587 return PTR_ERR(fd); 588 } 589 590 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 591 inc_nlink(dir_i); 592 593 jffs2_free_raw_dirent(rd); 594 595 /* Link the fd into the inode's list, obsoleting an old 596 one if necessary. */ 597 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 598 599 mutex_unlock(&dir_f->sem); 600 jffs2_complete_reservation(c); 601 602 d_instantiate(dentry, inode); 603 return 0; 604} 605 606static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 607{ 608 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 609 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 610 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 611 struct jffs2_full_dirent *fd; 612 int ret; 613 uint32_t now = get_seconds(); 614 615 for (fd = f->dents ; fd; fd = fd->next) { 616 if (fd->ino) 617 return -ENOTEMPTY; 618 } 619 620 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 621 dentry->d_name.len, f, now); 622 if (!ret) { 623 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 624 clear_nlink(dentry->d_inode); 625 drop_nlink(dir_i); 626 } 627 return ret; 628} 629 630static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 631{ 632 struct jffs2_inode_info *f, *dir_f; 633 struct jffs2_sb_info *c; 634 struct inode *inode; 635 struct jffs2_raw_inode *ri; 636 struct jffs2_raw_dirent *rd; 637 struct jffs2_full_dnode *fn; 638 struct jffs2_full_dirent *fd; 639 int namelen; 640 union jffs2_device_node dev; 641 int devlen = 0; 642 uint32_t alloclen; 643 int ret; 644 645 if (!new_valid_dev(rdev)) 646 return -EINVAL; 647 648 ri = jffs2_alloc_raw_inode(); 649 if (!ri) 650 return -ENOMEM; 651 652 c = JFFS2_SB_INFO(dir_i->i_sb); 653 654 if (S_ISBLK(mode) || S_ISCHR(mode)) 655 devlen = jffs2_encode_dev(&dev, rdev); 656 657 /* Try to reserve enough space for both node and dirent. 658 * Just the node will do for now, though 659 */ 660 namelen = dentry->d_name.len; 661 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 662 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 663 664 if (ret) { 665 jffs2_free_raw_inode(ri); 666 return ret; 667 } 668 669 inode = jffs2_new_inode(dir_i, mode, ri); 670 671 if (IS_ERR(inode)) { 672 jffs2_free_raw_inode(ri); 673 jffs2_complete_reservation(c); 674 return PTR_ERR(inode); 675 } 676 inode->i_op = &jffs2_file_inode_operations; 677 init_special_inode(inode, inode->i_mode, rdev); 678 679 f = JFFS2_INODE_INFO(inode); 680 681 ri->dsize = ri->csize = cpu_to_je32(devlen); 682 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 683 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 684 685 ri->compr = JFFS2_COMPR_NONE; 686 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 687 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 688 689 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 690 691 jffs2_free_raw_inode(ri); 692 693 if (IS_ERR(fn)) { 694 /* Eeek. Wave bye bye */ 695 mutex_unlock(&f->sem); 696 jffs2_complete_reservation(c); 697 jffs2_clear_inode(inode); 698 return PTR_ERR(fn); 699 } 700 /* No data here. Only a metadata node, which will be 701 obsoleted by the first data write 702 */ 703 f->metadata = fn; 704 mutex_unlock(&f->sem); 705 706 jffs2_complete_reservation(c); 707 708 ret = jffs2_init_security(inode, dir_i); 709 if (ret) { 710 jffs2_clear_inode(inode); 711 return ret; 712 } 713 ret = jffs2_init_acl_post(inode); 714 if (ret) { 715 jffs2_clear_inode(inode); 716 return ret; 717 } 718 719 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 720 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 721 if (ret) { 722 /* Eep. */ 723 jffs2_clear_inode(inode); 724 return ret; 725 } 726 727 rd = jffs2_alloc_raw_dirent(); 728 if (!rd) { 729 /* Argh. Now we treat it like a normal delete */ 730 jffs2_complete_reservation(c); 731 jffs2_clear_inode(inode); 732 return -ENOMEM; 733 } 734 735 dir_f = JFFS2_INODE_INFO(dir_i); 736 mutex_lock(&dir_f->sem); 737 738 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 739 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 740 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 741 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 742 743 rd->pino = cpu_to_je32(dir_i->i_ino); 744 rd->version = cpu_to_je32(++dir_f->highest_version); 745 rd->ino = cpu_to_je32(inode->i_ino); 746 rd->mctime = cpu_to_je32(get_seconds()); 747 rd->nsize = namelen; 748 749 /* XXX: This is ugly. */ 750 rd->type = (mode & S_IFMT) >> 12; 751 752 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 753 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 754 755 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 756 757 if (IS_ERR(fd)) { 758 /* dirent failed to write. Delete the inode normally 759 as if it were the final unlink() */ 760 jffs2_complete_reservation(c); 761 jffs2_free_raw_dirent(rd); 762 mutex_unlock(&dir_f->sem); 763 jffs2_clear_inode(inode); 764 return PTR_ERR(fd); 765 } 766 767 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 768 769 jffs2_free_raw_dirent(rd); 770 771 /* Link the fd into the inode's list, obsoleting an old 772 one if necessary. */ 773 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 774 775 mutex_unlock(&dir_f->sem); 776 jffs2_complete_reservation(c); 777 778 d_instantiate(dentry, inode); 779 780 return 0; 781} 782 783static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 784 struct inode *new_dir_i, struct dentry *new_dentry) 785{ 786 int ret; 787 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 788 struct jffs2_inode_info *victim_f = NULL; 789 uint8_t type; 790 uint32_t now; 791 792 /* The VFS will check for us and prevent trying to rename a 793 * file over a directory and vice versa, but if it's a directory, 794 * the VFS can't check whether the victim is empty. The filesystem 795 * needs to do that for itself. 796 */ 797 if (new_dentry->d_inode) { 798 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 799 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 800 struct jffs2_full_dirent *fd; 801 802 mutex_lock(&victim_f->sem); 803 for (fd = victim_f->dents; fd; fd = fd->next) { 804 if (fd->ino) { 805 mutex_unlock(&victim_f->sem); 806 return -ENOTEMPTY; 807 } 808 } 809 mutex_unlock(&victim_f->sem); 810 } 811 } 812 813 /* XXX: We probably ought to alloc enough space for 814 both nodes at the same time. Writing the new link, 815 then getting -ENOSPC, is quite bad :) 816 */ 817 818 /* Make a hard link */ 819 820 /* XXX: This is ugly */ 821 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 822 if (!type) type = DT_REG; 823 824 now = get_seconds(); 825 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 826 old_dentry->d_inode->i_ino, type, 827 new_dentry->d_name.name, new_dentry->d_name.len, now); 828 829 if (ret) 830 return ret; 831 832 if (victim_f) { 833 /* There was a victim. Kill it off nicely */ 834 drop_nlink(new_dentry->d_inode); 835 /* Don't oops if the victim was a dirent pointing to an 836 inode which didn't exist. */ 837 if (victim_f->inocache) { 838 mutex_lock(&victim_f->sem); 839 if (S_ISDIR(new_dentry->d_inode->i_mode)) 840 victim_f->inocache->pino_nlink = 0; 841 else 842 victim_f->inocache->pino_nlink--; 843 mutex_unlock(&victim_f->sem); 844 } 845 } 846 847 /* If it was a directory we moved, and there was no victim, 848 increase i_nlink on its new parent */ 849 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 850 inc_nlink(new_dir_i); 851 852 /* Unlink the original */ 853 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 854 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 855 856 /* We don't touch inode->i_nlink */ 857 858 if (ret) { 859 /* Oh shit. We really ought to make a single node which can do both atomically */ 860 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 861 mutex_lock(&f->sem); 862 inc_nlink(old_dentry->d_inode); 863 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode)) 864 f->inocache->pino_nlink++; 865 mutex_unlock(&f->sem); 866 867 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 868 /* Might as well let the VFS know */ 869 d_instantiate(new_dentry, old_dentry->d_inode); 870 atomic_inc(&old_dentry->d_inode->i_count); 871 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 872 return ret; 873 } 874 875 if (S_ISDIR(old_dentry->d_inode->i_mode)) 876 drop_nlink(old_dir_i); 877 878 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 879 880 return 0; 881} 882 883