dir.c revision 2b79adcca147c9f8fd1094ab4cb342d7e1790d70
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 1.87 2005/07/17 11:13:46 dedekind 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 <linux/jffs2_fs_i.h> 21#include <linux/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 40struct 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 .setattr = jffs2_setattr, 61}; 62 63/***********************************************************************/ 64 65 66/* We keep the dirent list sorted in increasing order of name hash, 67 and we use the same hash function as the dentries. Makes this 68 nice and simple 69*/ 70static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, 71 struct nameidata *nd) 72{ 73 struct jffs2_inode_info *dir_f; 74 struct jffs2_sb_info *c; 75 struct jffs2_full_dirent *fd = NULL, *fd_list; 76 uint32_t ino = 0; 77 struct inode *inode = NULL; 78 79 D1(printk(KERN_DEBUG "jffs2_lookup()\n")); 80 81 dir_f = JFFS2_INODE_INFO(dir_i); 82 c = JFFS2_SB_INFO(dir_i->i_sb); 83 84 down(&dir_f->sem); 85 86 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ 87 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) { 88 if (fd_list->nhash == target->d_name.hash && 89 (!fd || fd_list->version > fd->version) && 90 strlen(fd_list->name) == target->d_name.len && 91 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { 92 fd = fd_list; 93 } 94 } 95 if (fd) 96 ino = fd->ino; 97 up(&dir_f->sem); 98 if (ino) { 99 inode = iget(dir_i->i_sb, ino); 100 if (!inode) { 101 printk(KERN_WARNING "iget() failed for ino #%u\n", ino); 102 return (ERR_PTR(-EIO)); 103 } 104 } 105 106 d_add(target, inode); 107 108 return NULL; 109} 110 111/***********************************************************************/ 112 113 114static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir) 115{ 116 struct jffs2_inode_info *f; 117 struct jffs2_sb_info *c; 118 struct inode *inode = filp->f_dentry->d_inode; 119 struct jffs2_full_dirent *fd; 120 unsigned long offset, curofs; 121 122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino)); 123 124 f = JFFS2_INODE_INFO(inode); 125 c = JFFS2_SB_INFO(inode->i_sb); 126 127 offset = filp->f_pos; 128 129 if (offset == 0) { 130 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino)); 131 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) 132 goto out; 133 offset++; 134 } 135 if (offset == 1) { 136 unsigned long pino = parent_ino(filp->f_dentry); 137 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino)); 138 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0) 139 goto out; 140 offset++; 141 } 142 143 curofs=1; 144 down(&f->sem); 145 for (fd = f->dents; fd; fd = fd->next) { 146 147 curofs++; 148 /* First loop: curofs = 2; offset = 2 */ 149 if (curofs < offset) { 150 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", 151 fd->name, fd->ino, fd->type, curofs, offset)); 152 continue; 153 } 154 if (!fd->ino) { 155 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name)); 156 offset++; 157 continue; 158 } 159 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type)); 160 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0) 161 break; 162 offset++; 163 } 164 up(&f->sem); 165 out: 166 filp->f_pos = offset; 167 return 0; 168} 169 170/***********************************************************************/ 171 172 173static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode, 174 struct nameidata *nd) 175{ 176 struct jffs2_raw_inode *ri; 177 struct jffs2_inode_info *f, *dir_f; 178 struct jffs2_sb_info *c; 179 struct inode *inode; 180 int ret; 181 182 ri = jffs2_alloc_raw_inode(); 183 if (!ri) 184 return -ENOMEM; 185 186 c = JFFS2_SB_INFO(dir_i->i_sb); 187 188 D1(printk(KERN_DEBUG "jffs2_create()\n")); 189 190 inode = jffs2_new_inode(dir_i, mode, ri); 191 192 if (IS_ERR(inode)) { 193 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); 194 jffs2_free_raw_inode(ri); 195 return PTR_ERR(inode); 196 } 197 198 inode->i_op = &jffs2_file_inode_operations; 199 inode->i_fop = &jffs2_file_operations; 200 inode->i_mapping->a_ops = &jffs2_file_address_operations; 201 inode->i_mapping->nrpages = 0; 202 203 f = JFFS2_INODE_INFO(inode); 204 dir_f = JFFS2_INODE_INFO(dir_i); 205 206 ret = jffs2_do_create(c, dir_f, f, ri, 207 dentry->d_name.name, dentry->d_name.len); 208 209 if (ret) { 210 make_bad_inode(inode); 211 iput(inode); 212 jffs2_free_raw_inode(ri); 213 return ret; 214 } 215 216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); 217 218 jffs2_free_raw_inode(ri); 219 d_instantiate(dentry, inode); 220 221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", 222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages)); 223 return 0; 224} 225 226/***********************************************************************/ 227 228 229static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) 230{ 231 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); 232 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 233 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode); 234 int ret; 235 236 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, 237 dentry->d_name.len, dead_f); 238 if (dead_f->inocache) 239 dentry->d_inode->i_nlink = dead_f->inocache->nlink; 240 return ret; 241} 242/***********************************************************************/ 243 244 245static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) 246{ 247 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb); 248 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 249 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); 250 int ret; 251 uint8_t type; 252 253 /* Don't let people make hard links to bad inodes. */ 254 if (!f->inocache) 255 return -EIO; 256 257 if (S_ISDIR(old_dentry->d_inode->i_mode)) 258 return -EPERM; 259 260 /* XXX: This is ugly */ 261 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 262 if (!type) type = DT_REG; 263 264 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len); 265 266 if (!ret) { 267 down(&f->sem); 268 old_dentry->d_inode->i_nlink = ++f->inocache->nlink; 269 up(&f->sem); 270 d_instantiate(dentry, old_dentry->d_inode); 271 atomic_inc(&old_dentry->d_inode->i_count); 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, phys_ofs; 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 -EINVAL; 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, &phys_ofs, &alloclen, ALLOC_NORMAL); 308 309 if (ret) { 310 jffs2_free_raw_inode(ri); 311 return ret; 312 } 313 314 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); 315 316 if (IS_ERR(inode)) { 317 jffs2_free_raw_inode(ri); 318 jffs2_complete_reservation(c); 319 return PTR_ERR(inode); 320 } 321 322 inode->i_op = &jffs2_symlink_inode_operations; 323 324 f = JFFS2_INODE_INFO(inode); 325 326 inode->i_size = targetlen; 327 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); 328 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); 329 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 330 331 ri->compr = JFFS2_COMPR_NONE; 332 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); 333 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 334 335 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL); 336 337 jffs2_free_raw_inode(ri); 338 339 if (IS_ERR(fn)) { 340 /* Eeek. Wave bye bye */ 341 up(&f->sem); 342 jffs2_complete_reservation(c); 343 jffs2_clear_inode(inode); 344 return PTR_ERR(fn); 345 } 346 347 /* We use f->target field to store the target path. */ 348 f->target = kmalloc(targetlen + 1, GFP_KERNEL); 349 if (!f->target) { 350 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1); 351 up(&f->sem); 352 jffs2_complete_reservation(c); 353 jffs2_clear_inode(inode); 354 return -ENOMEM; 355 } 356 357 memcpy(f->target, target, targetlen + 1); 358 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target)); 359 360 /* No data here. Only a metadata node, which will be 361 obsoleted by the first data write 362 */ 363 f->metadata = fn; 364 up(&f->sem); 365 366 jffs2_complete_reservation(c); 367 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 368 if (ret) { 369 /* Eep. */ 370 jffs2_clear_inode(inode); 371 return ret; 372 } 373 374 rd = jffs2_alloc_raw_dirent(); 375 if (!rd) { 376 /* Argh. Now we treat it like a normal delete */ 377 jffs2_complete_reservation(c); 378 jffs2_clear_inode(inode); 379 return -ENOMEM; 380 } 381 382 dir_f = JFFS2_INODE_INFO(dir_i); 383 down(&dir_f->sem); 384 385 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 386 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 387 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 388 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 389 390 rd->pino = cpu_to_je32(dir_i->i_ino); 391 rd->version = cpu_to_je32(++dir_f->highest_version); 392 rd->ino = cpu_to_je32(inode->i_ino); 393 rd->mctime = cpu_to_je32(get_seconds()); 394 rd->nsize = namelen; 395 rd->type = DT_LNK; 396 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 397 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 398 399 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 400 401 if (IS_ERR(fd)) { 402 /* dirent failed to write. Delete the inode normally 403 as if it were the final unlink() */ 404 jffs2_complete_reservation(c); 405 jffs2_free_raw_dirent(rd); 406 up(&dir_f->sem); 407 jffs2_clear_inode(inode); 408 return PTR_ERR(fd); 409 } 410 411 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 412 413 jffs2_free_raw_dirent(rd); 414 415 /* Link the fd into the inode's list, obsoleting an old 416 one if necessary. */ 417 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 418 419 up(&dir_f->sem); 420 jffs2_complete_reservation(c); 421 422 d_instantiate(dentry, inode); 423 return 0; 424} 425 426 427static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode) 428{ 429 struct jffs2_inode_info *f, *dir_f; 430 struct jffs2_sb_info *c; 431 struct inode *inode; 432 struct jffs2_raw_inode *ri; 433 struct jffs2_raw_dirent *rd; 434 struct jffs2_full_dnode *fn; 435 struct jffs2_full_dirent *fd; 436 int namelen; 437 uint32_t alloclen, phys_ofs; 438 int ret; 439 440 mode |= S_IFDIR; 441 442 ri = jffs2_alloc_raw_inode(); 443 if (!ri) 444 return -ENOMEM; 445 446 c = JFFS2_SB_INFO(dir_i->i_sb); 447 448 /* Try to reserve enough space for both node and dirent. 449 * Just the node will do for now, though 450 */ 451 namelen = dentry->d_name.len; 452 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); 453 454 if (ret) { 455 jffs2_free_raw_inode(ri); 456 return ret; 457 } 458 459 inode = jffs2_new_inode(dir_i, mode, ri); 460 461 if (IS_ERR(inode)) { 462 jffs2_free_raw_inode(ri); 463 jffs2_complete_reservation(c); 464 return PTR_ERR(inode); 465 } 466 467 inode->i_op = &jffs2_dir_inode_operations; 468 inode->i_fop = &jffs2_dir_operations; 469 /* Directories get nlink 2 at start */ 470 inode->i_nlink = 2; 471 472 f = JFFS2_INODE_INFO(inode); 473 474 ri->data_crc = cpu_to_je32(0); 475 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 476 477 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); 478 479 jffs2_free_raw_inode(ri); 480 481 if (IS_ERR(fn)) { 482 /* Eeek. Wave bye bye */ 483 up(&f->sem); 484 jffs2_complete_reservation(c); 485 jffs2_clear_inode(inode); 486 return PTR_ERR(fn); 487 } 488 /* No data here. Only a metadata node, which will be 489 obsoleted by the first data write 490 */ 491 f->metadata = fn; 492 up(&f->sem); 493 494 jffs2_complete_reservation(c); 495 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 496 if (ret) { 497 /* Eep. */ 498 jffs2_clear_inode(inode); 499 return ret; 500 } 501 502 rd = jffs2_alloc_raw_dirent(); 503 if (!rd) { 504 /* Argh. Now we treat it like a normal delete */ 505 jffs2_complete_reservation(c); 506 jffs2_clear_inode(inode); 507 return -ENOMEM; 508 } 509 510 dir_f = JFFS2_INODE_INFO(dir_i); 511 down(&dir_f->sem); 512 513 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 514 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 515 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 516 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 517 518 rd->pino = cpu_to_je32(dir_i->i_ino); 519 rd->version = cpu_to_je32(++dir_f->highest_version); 520 rd->ino = cpu_to_je32(inode->i_ino); 521 rd->mctime = cpu_to_je32(get_seconds()); 522 rd->nsize = namelen; 523 rd->type = DT_DIR; 524 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 525 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 526 527 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 528 529 if (IS_ERR(fd)) { 530 /* dirent failed to write. Delete the inode normally 531 as if it were the final unlink() */ 532 jffs2_complete_reservation(c); 533 jffs2_free_raw_dirent(rd); 534 up(&dir_f->sem); 535 jffs2_clear_inode(inode); 536 return PTR_ERR(fd); 537 } 538 539 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 540 dir_i->i_nlink++; 541 542 jffs2_free_raw_dirent(rd); 543 544 /* Link the fd into the inode's list, obsoleting an old 545 one if necessary. */ 546 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 547 548 up(&dir_f->sem); 549 jffs2_complete_reservation(c); 550 551 d_instantiate(dentry, inode); 552 return 0; 553} 554 555static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) 556{ 557 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode); 558 struct jffs2_full_dirent *fd; 559 int ret; 560 561 for (fd = f->dents ; fd; fd = fd->next) { 562 if (fd->ino) 563 return -ENOTEMPTY; 564 } 565 ret = jffs2_unlink(dir_i, dentry); 566 if (!ret) 567 dir_i->i_nlink--; 568 return ret; 569} 570 571static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev) 572{ 573 struct jffs2_inode_info *f, *dir_f; 574 struct jffs2_sb_info *c; 575 struct inode *inode; 576 struct jffs2_raw_inode *ri; 577 struct jffs2_raw_dirent *rd; 578 struct jffs2_full_dnode *fn; 579 struct jffs2_full_dirent *fd; 580 int namelen; 581 jint16_t dev; 582 int devlen = 0; 583 uint32_t alloclen, phys_ofs; 584 int ret; 585 586 if (!old_valid_dev(rdev)) 587 return -EINVAL; 588 589 ri = jffs2_alloc_raw_inode(); 590 if (!ri) 591 return -ENOMEM; 592 593 c = JFFS2_SB_INFO(dir_i->i_sb); 594 595 if (S_ISBLK(mode) || S_ISCHR(mode)) { 596 dev = cpu_to_je16(old_encode_dev(rdev)); 597 devlen = sizeof(dev); 598 } 599 600 /* Try to reserve enough space for both node and dirent. 601 * Just the node will do for now, though 602 */ 603 namelen = dentry->d_name.len; 604 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL); 605 606 if (ret) { 607 jffs2_free_raw_inode(ri); 608 return ret; 609 } 610 611 inode = jffs2_new_inode(dir_i, mode, ri); 612 613 if (IS_ERR(inode)) { 614 jffs2_free_raw_inode(ri); 615 jffs2_complete_reservation(c); 616 return PTR_ERR(inode); 617 } 618 inode->i_op = &jffs2_file_inode_operations; 619 init_special_inode(inode, inode->i_mode, rdev); 620 621 f = JFFS2_INODE_INFO(inode); 622 623 ri->dsize = ri->csize = cpu_to_je32(devlen); 624 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); 625 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); 626 627 ri->compr = JFFS2_COMPR_NONE; 628 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); 629 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); 630 631 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL); 632 633 jffs2_free_raw_inode(ri); 634 635 if (IS_ERR(fn)) { 636 /* Eeek. Wave bye bye */ 637 up(&f->sem); 638 jffs2_complete_reservation(c); 639 jffs2_clear_inode(inode); 640 return PTR_ERR(fn); 641 } 642 /* No data here. Only a metadata node, which will be 643 obsoleted by the first data write 644 */ 645 f->metadata = fn; 646 up(&f->sem); 647 648 jffs2_complete_reservation(c); 649 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); 650 if (ret) { 651 /* Eep. */ 652 jffs2_clear_inode(inode); 653 return ret; 654 } 655 656 rd = jffs2_alloc_raw_dirent(); 657 if (!rd) { 658 /* Argh. Now we treat it like a normal delete */ 659 jffs2_complete_reservation(c); 660 jffs2_clear_inode(inode); 661 return -ENOMEM; 662 } 663 664 dir_f = JFFS2_INODE_INFO(dir_i); 665 down(&dir_f->sem); 666 667 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); 668 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); 669 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); 670 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); 671 672 rd->pino = cpu_to_je32(dir_i->i_ino); 673 rd->version = cpu_to_je32(++dir_f->highest_version); 674 rd->ino = cpu_to_je32(inode->i_ino); 675 rd->mctime = cpu_to_je32(get_seconds()); 676 rd->nsize = namelen; 677 678 /* XXX: This is ugly. */ 679 rd->type = (mode & S_IFMT) >> 12; 680 681 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); 682 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); 683 684 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL); 685 686 if (IS_ERR(fd)) { 687 /* dirent failed to write. Delete the inode normally 688 as if it were the final unlink() */ 689 jffs2_complete_reservation(c); 690 jffs2_free_raw_dirent(rd); 691 up(&dir_f->sem); 692 jffs2_clear_inode(inode); 693 return PTR_ERR(fd); 694 } 695 696 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); 697 698 jffs2_free_raw_dirent(rd); 699 700 /* Link the fd into the inode's list, obsoleting an old 701 one if necessary. */ 702 jffs2_add_fd_to_list(c, fd, &dir_f->dents); 703 704 up(&dir_f->sem); 705 jffs2_complete_reservation(c); 706 707 d_instantiate(dentry, inode); 708 709 return 0; 710} 711 712static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, 713 struct inode *new_dir_i, struct dentry *new_dentry) 714{ 715 int ret; 716 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); 717 struct jffs2_inode_info *victim_f = NULL; 718 uint8_t type; 719 720 /* The VFS will check for us and prevent trying to rename a 721 * file over a directory and vice versa, but if it's a directory, 722 * the VFS can't check whether the victim is empty. The filesystem 723 * needs to do that for itself. 724 */ 725 if (new_dentry->d_inode) { 726 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); 727 if (S_ISDIR(new_dentry->d_inode->i_mode)) { 728 struct jffs2_full_dirent *fd; 729 730 down(&victim_f->sem); 731 for (fd = victim_f->dents; fd; fd = fd->next) { 732 if (fd->ino) { 733 up(&victim_f->sem); 734 return -ENOTEMPTY; 735 } 736 } 737 up(&victim_f->sem); 738 } 739 } 740 741 /* XXX: We probably ought to alloc enough space for 742 both nodes at the same time. Writing the new link, 743 then getting -ENOSPC, is quite bad :) 744 */ 745 746 /* Make a hard link */ 747 748 /* XXX: This is ugly */ 749 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12; 750 if (!type) type = DT_REG; 751 752 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), 753 old_dentry->d_inode->i_ino, type, 754 new_dentry->d_name.name, new_dentry->d_name.len); 755 756 if (ret) 757 return ret; 758 759 if (victim_f) { 760 /* There was a victim. Kill it off nicely */ 761 new_dentry->d_inode->i_nlink--; 762 /* Don't oops if the victim was a dirent pointing to an 763 inode which didn't exist. */ 764 if (victim_f->inocache) { 765 down(&victim_f->sem); 766 victim_f->inocache->nlink--; 767 up(&victim_f->sem); 768 } 769 } 770 771 /* If it was a directory we moved, and there was no victim, 772 increase i_nlink on its new parent */ 773 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f) 774 new_dir_i->i_nlink++; 775 776 /* Unlink the original */ 777 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), 778 old_dentry->d_name.name, old_dentry->d_name.len, NULL); 779 780 /* We don't touch inode->i_nlink */ 781 782 if (ret) { 783 /* Oh shit. We really ought to make a single node which can do both atomically */ 784 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode); 785 down(&f->sem); 786 old_dentry->d_inode->i_nlink++; 787 if (f->inocache) 788 f->inocache->nlink++; 789 up(&f->sem); 790 791 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); 792 /* Might as well let the VFS know */ 793 d_instantiate(new_dentry, old_dentry->d_inode); 794 atomic_inc(&old_dentry->d_inode->i_count); 795 return ret; 796 } 797 798 if (S_ISDIR(old_dentry->d_inode->i_mode)) 799 old_dir_i->i_nlink--; 800 801 return 0; 802} 803 804