dir.c revision ec2e203c8297d576c74a101cebd657bc1f180dd1
1/* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2001-2003 Red Hat, Inc. 5 * 6 * Created by David Woodhouse <dwmw2@infradead.org> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $ 11 * 12 */ 13 14#include <linux/kernel.h> 15#include <linux/slab.h> 16#include <linux/sched.h> 17#include <linux/fs.h> 18#include <linux/crc32.h> 19#include <linux/jffs2.h> 20#include "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 *,int, 28 struct nameidata *); 29static struct dentry *jffs2_lookup (struct inode *,struct dentry *, 30 struct nameidata *); 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 *,int); 35static int jffs2_rmdir (struct inode *,struct dentry *); 36static int jffs2_mknod (struct inode *,struct dentry *,int,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 .ioctl = jffs2_ioctl, 45 .fsync = jffs2_fsync 46}; 47 48 49struct inode_operations jffs2_dir_inode_operations = 50{ 51 .create = jffs2_create, 52 .lookup = jffs2_lookup, 53 .link = jffs2_link, 54 .unlink = jffs2_unlink, 55 .symlink = jffs2_symlink, 56 .mkdir = jffs2_mkdir, 57 .rmdir = jffs2_rmdir, 58 .mknod = jffs2_mknod, 59 .rename = jffs2_rename, 60 .permission = jffs2_permission, 61 .setattr = jffs2_setattr, 62 .setxattr = jffs2_setxattr, 63 .getxattr = jffs2_getxattr, 64 .listxattr = jffs2_listxattr, 65 .removexattr = jffs2_removexattr 66}; 67 68/***********************************************************************/ 69 70 71/* We keep the dirent list sorted in increasing order of name hash, 72 and we use the same hash function as the dentries. Makes this 73 nice and simple 74*/ 75static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 76 struct nameidata *nd) 77{ 78 struct jffs2_inode_info *dir_f; 79 struct jffs2_sb_info *c; 80 struct jffs2_full_dirent *fd = NULL, *fd_list; 81 uint32_t ino = 0; 82 struct inode *inode = NULL; 83 84 D1(printk(KERN_DEBUG "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 c = JFFS2_SB_INFO(dir_i->i_sb); 91 92 down(&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 up(&dir_f->sem); 106 if (ino) { 107 inode = iget(dir_i->i_sb, ino); 108 if (!inode) { 109 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 110 return (ERR_PTR(-EIO)); 111 } 112 } 113 114 d_add(target, inode); 115 116 return NULL; 117} 118 119/***********************************************************************/ 120 121 122static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 123{ 124 struct jffs2_inode_info *f; 125 struct jffs2_sb_info *c; 126 struct inode *inode = filp->f_path.dentry->d_inode; 127 struct jffs2_full_dirent *fd; 128 unsigned long offset, curofs; 129 130 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino)); 131 132 f = JFFS2_INODE_INFO(inode); 133 c = JFFS2_SB_INFO(inode->i_sb); 134 135 offset = filp->f_pos; 136 137 if (offset == 0) { 138 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 139 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 140 goto out; 141 offset++; 142 } 143 if (offset == 1) { 144 unsigned long pino = parent_ino(filp->f_path.dentry); 145 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 146 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 147 goto out; 148 offset++; 149 } 150 151 curofs=1; 152 down(&f->sem); 153 for (fd = f->dents; fd; fd = fd->next) { 154 155 curofs++; 156 /* First loop: curofs = 2; offset = 2 */ 157 if (curofs < offset) { 158 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 159 fd->name, fd->ino, fd->type, curofs, offset)); 160 continue; 161 } 162 if (!fd->ino) { 163 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 164 offset++; 165 continue; 166 } 167 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 168 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 169 break; 170 offset++; 171 } 172 up(&f->sem); 173 out: 174 filp->f_pos = offset; 175 return 0; 176} 177 178/***********************************************************************/ 179 180 181static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 182 struct nameidata *nd) 183{ 184 struct jffs2_raw_inode *ri; 185 struct jffs2_inode_info *f, *dir_f; 186 struct jffs2_sb_info *c; 187 struct inode *inode; 188 int ret; 189 190 ri = jffs2_alloc_raw_inode(); 191 if (!ri) 192 return -ENOMEM; 193 194 c = JFFS2_SB_INFO(dir_i->i_sb); 195 196 D1(printk(KERN_DEBUG "jffs2_create()\n")); 197 198 inode = jffs2_new_inode(dir_i, mode, ri); 199 200 if (IS_ERR(inode)) { 201 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 202 jffs2_free_raw_inode(ri); 203 return PTR_ERR(inode); 204 } 205 206 inode->i_op = &jffs2_file_inode_operations; 207 inode->i_fop = &jffs2_file_operations; 208 inode->i_mapping->a_ops = &jffs2_file_address_operations; 209 inode->i_mapping->nrpages = 0; 210 211 f = JFFS2_INODE_INFO(inode); 212 dir_f = JFFS2_INODE_INFO(dir_i); 213 214 ret = jffs2_do_create(c, dir_f, f, ri, 215 dentry->d_name.name, dentry->d_name.len); 216 217 if (ret) 218 goto fail; 219 220 ret = jffs2_init_security(inode, dir_i); 221 if (ret) 222 goto fail; 223 ret = jffs2_init_acl(inode, dir_i); 224 if (ret) 225 goto fail; 226 227 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 228 229 jffs2_free_raw_inode(ri); 230 d_instantiate(dentry, inode); 231 232 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 233 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 234 return 0; 235 236 fail: 237 make_bad_inode(inode); 238 iput(inode); 239 jffs2_free_raw_inode(ri); 240 return ret; 241} 242 243/***********************************************************************/ 244 245 246static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 247{ 248 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 250 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 251 int ret; 252 uint32_t now = get_seconds(); 253 254 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 255 dentry->d_name.len, dead_f, now); 256 if (dead_f->inocache) 257 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 258 if (!ret) 259 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 260 return ret; 261} 262/***********************************************************************/ 263 264 265static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 266{ 267 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 268 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 269 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 270 int ret; 271 uint8_t type; 272 uint32_t now; 273 274 /* Don't let people make hard links to bad inodes. */ 275 if (!f->inocache) 276 return -EIO; 277 278 if (S_ISDIR(old_dentry->d_inode->i_mode)) 279 return -EPERM; 280 281 /* XXX: This is ugly */ 282 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 283 if (!type) type = DT_REG; 284 285 now = get_seconds(); 286 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); 287 288 if (!ret) { 289 down(&f->sem); 290 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 291 up(&f->sem); 292 d_instantiate(dentry, old_dentry->d_inode); 293 dir_i->i_mtime = dir_i->i_ctime = ITIME(now); 294 atomic_inc(&old_dentry->d_inode->i_count); 295 } 296 return ret; 297} 298 299/***********************************************************************/ 300 301static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) 302{ 303 struct jffs2_inode_info *f, *dir_f; 304 struct jffs2_sb_info *c; 305 struct inode *inode; 306 struct jffs2_raw_inode *ri; 307 struct jffs2_raw_dirent *rd; 308 struct jffs2_full_dnode *fn; 309 struct jffs2_full_dirent *fd; 310 int namelen; 311 uint32_t alloclen; 312 int ret, targetlen = strlen(target); 313 314 /* FIXME: If you care. We'd need to use frags for the target 315 if it grows much more than this */ 316 if (targetlen > 254) 317 return -EINVAL; 318 319 ri = jffs2_alloc_raw_inode(); 320 321 if (!ri) 322 return -ENOMEM; 323 324 c = JFFS2_SB_INFO(dir_i->i_sb); 325 326 /* Try to reserve enough space for both node and dirent. 327 * Just the node will do for now, though 328 */ 329 namelen = dentry->d_name.len; 330 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, 331 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 332 333 if (ret) { 334 jffs2_free_raw_inode(ri); 335 return ret; 336 } 337 338 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 339 340 if (IS_ERR(inode)) { 341 jffs2_free_raw_inode(ri); 342 jffs2_complete_reservation(c); 343 return PTR_ERR(inode); 344 } 345 346 inode->i_op = &jffs2_symlink_inode_operations; 347 348 f = JFFS2_INODE_INFO(inode); 349 350 inode->i_size = targetlen; 351 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 352 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 353 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 354 355 ri->compr = JFFS2_COMPR_NONE; 356 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 357 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 358 359 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); 360 361 jffs2_free_raw_inode(ri); 362 363 if (IS_ERR(fn)) { 364 /* Eeek. Wave bye bye */ 365 up(&f->sem); 366 jffs2_complete_reservation(c); 367 jffs2_clear_inode(inode); 368 return PTR_ERR(fn); 369 } 370 371 /* We use f->target field to store the target path. */ 372 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 373 if (!f->target) { 374 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 375 up(&f->sem); 376 jffs2_complete_reservation(c); 377 jffs2_clear_inode(inode); 378 return -ENOMEM; 379 } 380 381 memcpy(f->target, target, targetlen + 1); 382 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 383 384 /* No data here. Only a metadata node, which will be 385 obsoleted by the first data write 386 */ 387 f->metadata = fn; 388 up(&f->sem); 389 390 jffs2_complete_reservation(c); 391 392 ret = jffs2_init_security(inode, dir_i); 393 if (ret) { 394 jffs2_clear_inode(inode); 395 return ret; 396 } 397 ret = jffs2_init_acl(inode, dir_i); 398 if (ret) { 399 jffs2_clear_inode(inode); 400 return ret; 401 } 402 403 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 404 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 405 if (ret) { 406 /* Eep. */ 407 jffs2_clear_inode(inode); 408 return ret; 409 } 410 411 rd = jffs2_alloc_raw_dirent(); 412 if (!rd) { 413 /* Argh. Now we treat it like a normal delete */ 414 jffs2_complete_reservation(c); 415 jffs2_clear_inode(inode); 416 return -ENOMEM; 417 } 418 419 dir_f = JFFS2_INODE_INFO(dir_i); 420 down(&dir_f->sem); 421 422 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 423 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 424 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 425 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 426 427 rd->pino = cpu_to_je32(dir_i->i_ino); 428 rd->version = cpu_to_je32(++dir_f->highest_version); 429 rd->ino = cpu_to_je32(inode->i_ino); 430 rd->mctime = cpu_to_je32(get_seconds()); 431 rd->nsize = namelen; 432 rd->type = DT_LNK; 433 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 434 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 435 436 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 437 438 if (IS_ERR(fd)) { 439 /* dirent failed to write. Delete the inode normally 440 as if it were the final unlink() */ 441 jffs2_complete_reservation(c); 442 jffs2_free_raw_dirent(rd); 443 up(&dir_f->sem); 444 jffs2_clear_inode(inode); 445 return PTR_ERR(fd); 446 } 447 448 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 449 450 jffs2_free_raw_dirent(rd); 451 452 /* Link the fd into the inode's list, obsoleting an old 453 one if necessary. */ 454 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 455 456 up(&dir_f->sem); 457 jffs2_complete_reservation(c); 458 459 d_instantiate(dentry, inode); 460 return 0; 461} 462 463 464static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 465{ 466 struct jffs2_inode_info *f, *dir_f; 467 struct jffs2_sb_info *c; 468 struct inode *inode; 469 struct jffs2_raw_inode *ri; 470 struct jffs2_raw_dirent *rd; 471 struct jffs2_full_dnode *fn; 472 struct jffs2_full_dirent *fd; 473 int namelen; 474 uint32_t alloclen; 475 int ret; 476 477 mode |= S_IFDIR; 478 479 ri = jffs2_alloc_raw_inode(); 480 if (!ri) 481 return -ENOMEM; 482 483 c = JFFS2_SB_INFO(dir_i->i_sb); 484 485 /* Try to reserve enough space for both node and dirent. 486 * Just the node will do for now, though 487 */ 488 namelen = dentry->d_name.len; 489 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, 490 JFFS2_SUMMARY_INODE_SIZE); 491 492 if (ret) { 493 jffs2_free_raw_inode(ri); 494 return ret; 495 } 496 497 inode = jffs2_new_inode(dir_i, mode, ri); 498 499 if (IS_ERR(inode)) { 500 jffs2_free_raw_inode(ri); 501 jffs2_complete_reservation(c); 502 return PTR_ERR(inode); 503 } 504 505 inode->i_op = &jffs2_dir_inode_operations; 506 inode->i_fop = &jffs2_dir_operations; 507 /* Directories get nlink 2 at start */ 508 inode->i_nlink = 2; 509 510 f = JFFS2_INODE_INFO(inode); 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 up(&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 up(&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(inode, dir_i); 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 down(&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 up(&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 up(&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_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 609 struct jffs2_full_dirent *fd; 610 int ret; 611 612 for (fd = f->dents ; fd; fd = fd->next) { 613 if (fd->ino) 614 return -ENOTEMPTY; 615 } 616 ret = jffs2_unlink(dir_i, dentry); 617 if (!ret) 618 drop_nlink(dir_i); 619 return ret; 620} 621 622static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 623{ 624 struct jffs2_inode_info *f, *dir_f; 625 struct jffs2_sb_info *c; 626 struct inode *inode; 627 struct jffs2_raw_inode *ri; 628 struct jffs2_raw_dirent *rd; 629 struct jffs2_full_dnode *fn; 630 struct jffs2_full_dirent *fd; 631 int namelen; 632 union jffs2_device_node dev; 633 int devlen = 0; 634 uint32_t alloclen; 635 int ret; 636 637 if (!new_valid_dev(rdev)) 638 return -EINVAL; 639 640 ri = jffs2_alloc_raw_inode(); 641 if (!ri) 642 return -ENOMEM; 643 644 c = JFFS2_SB_INFO(dir_i->i_sb); 645 646 if (S_ISBLK(mode) || S_ISCHR(mode)) 647 devlen = jffs2_encode_dev(&dev, rdev); 648 649 /* Try to reserve enough space for both node and dirent. 650 * Just the node will do for now, though 651 */ 652 namelen = dentry->d_name.len; 653 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, 654 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); 655 656 if (ret) { 657 jffs2_free_raw_inode(ri); 658 return ret; 659 } 660 661 inode = jffs2_new_inode(dir_i, mode, ri); 662 663 if (IS_ERR(inode)) { 664 jffs2_free_raw_inode(ri); 665 jffs2_complete_reservation(c); 666 return PTR_ERR(inode); 667 } 668 inode->i_op = &jffs2_file_inode_operations; 669 init_special_inode(inode, inode->i_mode, rdev); 670 671 f = JFFS2_INODE_INFO(inode); 672 673 ri->dsize = ri->csize = cpu_to_je32(devlen); 674 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 675 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 676 677 ri->compr = JFFS2_COMPR_NONE; 678 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 679 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 680 681 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); 682 683 jffs2_free_raw_inode(ri); 684 685 if (IS_ERR(fn)) { 686 /* Eeek. Wave bye bye */ 687 up(&f->sem); 688 jffs2_complete_reservation(c); 689 jffs2_clear_inode(inode); 690 return PTR_ERR(fn); 691 } 692 /* No data here. Only a metadata node, which will be 693 obsoleted by the first data write 694 */ 695 f->metadata = fn; 696 up(&f->sem); 697 698 jffs2_complete_reservation(c); 699 700 ret = jffs2_init_security(inode, dir_i); 701 if (ret) { 702 jffs2_clear_inode(inode); 703 return ret; 704 } 705 ret = jffs2_init_acl(inode, dir_i); 706 if (ret) { 707 jffs2_clear_inode(inode); 708 return ret; 709 } 710 711 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, 712 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); 713 if (ret) { 714 /* Eep. */ 715 jffs2_clear_inode(inode); 716 return ret; 717 } 718 719 rd = jffs2_alloc_raw_dirent(); 720 if (!rd) { 721 /* Argh. Now we treat it like a normal delete */ 722 jffs2_complete_reservation(c); 723 jffs2_clear_inode(inode); 724 return -ENOMEM; 725 } 726 727 dir_f = JFFS2_INODE_INFO(dir_i); 728 down(&dir_f->sem); 729 730 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 731 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 732 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 733 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 734 735 rd->pino = cpu_to_je32(dir_i->i_ino); 736 rd->version = cpu_to_je32(++dir_f->highest_version); 737 rd->ino = cpu_to_je32(inode->i_ino); 738 rd->mctime = cpu_to_je32(get_seconds()); 739 rd->nsize = namelen; 740 741 /* XXX: This is ugly. */ 742 rd->type = (mode & S_IFMT) >> 12; 743 744 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 745 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 746 747 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); 748 749 if (IS_ERR(fd)) { 750 /* dirent failed to write. Delete the inode normally 751 as if it were the final unlink() */ 752 jffs2_complete_reservation(c); 753 jffs2_free_raw_dirent(rd); 754 up(&dir_f->sem); 755 jffs2_clear_inode(inode); 756 return PTR_ERR(fd); 757 } 758 759 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 760 761 jffs2_free_raw_dirent(rd); 762 763 /* Link the fd into the inode's list, obsoleting an old 764 one if necessary. */ 765 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 766 767 up(&dir_f->sem); 768 jffs2_complete_reservation(c); 769 770 d_instantiate(dentry, inode); 771 772 return 0; 773} 774 775static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 776 struct inode *new_dir_i, struct dentry *new_dentry) 777{ 778 int ret; 779 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 780 struct jffs2_inode_info *victim_f = NULL; 781 uint8_t type; 782 uint32_t now; 783 784 /* The VFS will check for us and prevent trying to rename a 785 * file over a directory and vice versa, but if it's a directory, 786 * the VFS can't check whether the victim is empty. The filesystem 787 * needs to do that for itself. 788 */ 789 if (new_dentry->d_inode) { 790 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 791 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 792 struct jffs2_full_dirent *fd; 793 794 down(&victim_f->sem); 795 for (fd = victim_f->dents; fd; fd = fd->next) { 796 if (fd->ino) { 797 up(&victim_f->sem); 798 return -ENOTEMPTY; 799 } 800 } 801 up(&victim_f->sem); 802 } 803 } 804 805 /* XXX: We probably ought to alloc enough space for 806 both nodes at the same time. Writing the new link, 807 then getting -ENOSPC, is quite bad :) 808 */ 809 810 /* Make a hard link */ 811 812 /* XXX: This is ugly */ 813 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 814 if (!type) type = DT_REG; 815 816 now = get_seconds(); 817 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 818 old_dentry->d_inode->i_ino, type, 819 new_dentry->d_name.name, new_dentry->d_name.len, now); 820 821 if (ret) 822 return ret; 823 824 if (victim_f) { 825 /* There was a victim. Kill it off nicely */ 826 drop_nlink(new_dentry->d_inode); 827 /* Don't oops if the victim was a dirent pointing to an 828 inode which didn't exist. */ 829 if (victim_f->inocache) { 830 down(&victim_f->sem); 831 victim_f->inocache->nlink--; 832 up(&victim_f->sem); 833 } 834 } 835 836 /* If it was a directory we moved, and there was no victim, 837 increase i_nlink on its new parent */ 838 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 839 inc_nlink(new_dir_i); 840 841 /* Unlink the original */ 842 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 843 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); 844 845 /* We don't touch inode->i_nlink */ 846 847 if (ret) { 848 /* Oh shit. We really ought to make a single node which can do both atomically */ 849 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 850 down(&f->sem); 851 inc_nlink(old_dentry->d_inode); 852 if (f->inocache) 853 f->inocache->nlink++; 854 up(&f->sem); 855 856 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 857 /* Might as well let the VFS know */ 858 d_instantiate(new_dentry, old_dentry->d_inode); 859 atomic_inc(&old_dentry->d_inode->i_count); 860 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); 861 return ret; 862 } 863 864 if (S_ISDIR(old_dentry->d_inode->i_mode)) 865 drop_nlink(old_dir_i); 866 867 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); 868 869 return 0; 870} 871 872