fs/jffs2/dir.c

   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 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/fs.h>
  16 #include <linux/crc32.h>
  17 #include <linux/jffs2.h>
  18 #include "jffs2_fs_i.h"
  19 #include "jffs2_fs_sb.h"
  20 #include <linux/time.h>
  21 #include "nodelist.h"
  22
  23 static int jffs2_readdir (struct file *, void *, filldir_t);
  24
  25 static int jffs2_create (struct inode *,struct dentry *,umode_t,
  26                          struct nameidata *);
  27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  28                                     struct nameidata *);
  29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  30 static int jffs2_unlink (struct inode *,struct dentry *);
  31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  32 static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
  33 static int jffs2_rmdir (struct inode *,struct dentry *);
  34 static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
  35 static int jffs2_rename (struct inode *, struct dentry *,
  36                          struct inode *, struct dentry *);
  37
  38 const struct file_operations jffs2_dir_operations =
  39 {
  40         .read =         generic_read_dir,
  41         .readdir =      jffs2_readdir,
  42         .unlocked_ioctl=jffs2_ioctl,
  43         .fsync =        jffs2_fsync,
  44         .llseek =       generic_file_llseek,
  45 };
  46
  47
  48 const struct inode_operations jffs2_dir_inode_operations =
  49 {
  50         .create =       jffs2_create,
  51         .lookup =       jffs2_lookup,
  52         .link =         jffs2_link,
  53         .unlink =       jffs2_unlink,
  54         .symlink =      jffs2_symlink,
  55         .mkdir =        jffs2_mkdir,
  56         .rmdir =        jffs2_rmdir,
  57         .mknod =        jffs2_mknod,
  58         .rename =       jffs2_rename,
  59         .get_acl =      jffs2_get_acl,
  60         .setattr =      jffs2_setattr,
  61         .setxattr =     jffs2_setxattr,
  62         .getxattr =     jffs2_getxattr,
  63         .listxattr =    jffs2_listxattr,
  64         .removexattr =  jffs2_removexattr
  65 };
  66
  67 /***********************************************************************/
  68
  69
  70 /* We keep the dirent list sorted in increasing order of name hash,
  71    and we use the same hash function as the dentries. Makes this
  72    nice and simple
  73 */
  74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  75                                    struct nameidata *nd)
  76 {
  77         struct jffs2_inode_info *dir_f;
  78         struct jffs2_full_dirent *fd = NULL, *fd_list;
  79         uint32_t ino = 0;
  80         struct inode *inode = NULL;
  81
  82         jffs2_dbg(1, "jffs2_lookup()\n");
  83
  84         if (target->d_name.len > JFFS2_MAX_NAME_LEN)
  85                 return ERR_PTR(-ENAMETOOLONG);
  86
  87         dir_f = JFFS2_INODE_INFO(dir_i);
  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         }
 108
 109         return d_splice_alias(inode, target);
 110 }
 111
 112 /***********************************************************************/
 113
 114
 115 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 116 {
 117         struct jffs2_inode_info *f;
 118         struct inode *inode = filp->f_path.dentry->d_inode;
 119         struct jffs2_full_dirent *fd;
 120         unsigned long offset, curofs;
 121
 122         jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n",
 123                   filp->f_path.dentry->d_inode->i_ino);
 124
 125         f = JFFS2_INODE_INFO(inode);
 126
 127         offset = filp->f_pos;
 128
 129         if (offset == 0) {
 130                 jffs2_dbg(1, "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_path.dentry);
 137                 jffs2_dbg(1, "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         mutex_lock(&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                         jffs2_dbg(2, "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                         jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
 156                                   fd->name);
 157                         offset++;
 158                         continue;
 159                 }
 160                 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
 161                           offset, fd->name, fd->ino, fd->type);
 162                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 163                         break;
 164                 offset++;
 165         }
 166         mutex_unlock(&f->sem);
 167  out:
 168         filp->f_pos = offset;
 169         return 0;
 170 }
 171
 172 /***********************************************************************/
 173
 174
 175 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
 176                         umode_t mode, struct nameidata *nd)
 177 {
 178         struct jffs2_raw_inode *ri;
 179         struct jffs2_inode_info *f, *dir_f;
 180         struct jffs2_sb_info *c;
 181         struct inode *inode;
 182         int ret;
 183
 184         ri = jffs2_alloc_raw_inode();
 185         if (!ri)
 186                 return -ENOMEM;
 187
 188         c = JFFS2_SB_INFO(dir_i->i_sb);
 189
 190         jffs2_dbg(1, "%s()\n", __func__);
 191
 192         inode = jffs2_new_inode(dir_i, mode, ri);
 193
 194         if (IS_ERR(inode)) {
 195                 jffs2_dbg(1, "jffs2_new_inode() failed\n");
 196                 jffs2_free_raw_inode(ri);
 197                 return PTR_ERR(inode);
 198         }
 199
 200         inode->i_op = &jffs2_file_inode_operations;
 201         inode->i_fop = &jffs2_file_operations;
 202         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 203         inode->i_mapping->nrpages = 0;
 204
 205         f = JFFS2_INODE_INFO(inode);
 206         dir_f = JFFS2_INODE_INFO(dir_i);
 207
 208         /* jffs2_do_create() will want to lock it, _after_ reserving
 209            space and taking c-alloc_sem. If we keep it locked here,
 210            lockdep gets unhappy (although it's a false positive;
 211            nothing else will be looking at this inode yet so there's
 212            no chance of AB-BA deadlock involving its f->sem). */
 213         mutex_unlock(&f->sem);
 214
 215         ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
 216         if (ret)
 217                 goto fail;
 218
 219         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 220
 221         jffs2_free_raw_inode(ri);
 222
 223         jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 224                   __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
 225                   f->inocache->pino_nlink, inode->i_mapping->nrpages);
 226
 227         d_instantiate(dentry, inode);
 228         unlock_new_inode(inode);
 229         return 0;
 230
 231  fail:
 232         iget_failed(inode);
 233         jffs2_free_raw_inode(ri);
 234         return ret;
 235 }
 236
 237 /***********************************************************************/
 238
 239
 240 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 241 {
 242         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 243         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 244         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 245         int ret;
 246         uint32_t now = get_seconds();
 247
 248         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 249                               dentry->d_name.len, dead_f, now);
 250         if (dead_f->inocache)
 251                 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink);
 252         if (!ret)
 253                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 254         return ret;
 255 }
 256 /***********************************************************************/
 257
 258
 259 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 260 {
 261         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 262         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 263         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 264         int ret;
 265         uint8_t type;
 266         uint32_t now;
 267
 268         /* Don't let people make hard links to bad inodes. */
 269         if (!f->inocache)
 270                 return -EIO;
 271
 272         if (S_ISDIR(old_dentry->d_inode->i_mode))
 273                 return -EPERM;
 274
 275         /* XXX: This is ugly */
 276         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 277         if (!type) type = DT_REG;
 278
 279         now = get_seconds();
 280         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 281
 282         if (!ret) {
 283                 mutex_lock(&f->sem);
 284                 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink);
 285                 mutex_unlock(&f->sem);
 286                 d_instantiate(dentry, old_dentry->d_inode);
 287                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 288                 ihold(old_dentry->d_inode);
 289         }
 290         return ret;
 291 }
 292
 293 /***********************************************************************/
 294
 295 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 296 {
 297         struct jffs2_inode_info *f, *dir_f;
 298         struct jffs2_sb_info *c;
 299         struct inode *inode;
 300         struct jffs2_raw_inode *ri;
 301         struct jffs2_raw_dirent *rd;
 302         struct jffs2_full_dnode *fn;
 303         struct jffs2_full_dirent *fd;
 304         int namelen;
 305         uint32_t alloclen;
 306         int ret, targetlen = strlen(target);
 307
 308         /* FIXME: If you care. We'd need to use frags for the target
 309            if it grows much more than this */
 310         if (targetlen > 254)
 311                 return -ENAMETOOLONG;
 312
 313         ri = jffs2_alloc_raw_inode();
 314
 315         if (!ri)
 316                 return -ENOMEM;
 317
 318         c = JFFS2_SB_INFO(dir_i->i_sb);
 319
 320         /* Try to reserve enough space for both node and dirent.
 321          * Just the node will do for now, though
 322          */
 323         namelen = dentry->d_name.len;
 324         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 325                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 326
 327         if (ret) {
 328                 jffs2_free_raw_inode(ri);
 329                 return ret;
 330         }
 331
 332         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 333
 334         if (IS_ERR(inode)) {
 335                 jffs2_free_raw_inode(ri);
 336                 jffs2_complete_reservation(c);
 337                 return PTR_ERR(inode);
 338         }
 339
 340         inode->i_op = &jffs2_symlink_inode_operations;
 341
 342         f = JFFS2_INODE_INFO(inode);
 343
 344         inode->i_size = targetlen;
 345         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 346         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 347         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 348
 349         ri->compr = JFFS2_COMPR_NONE;
 350         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 351         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 352
 353         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 354
 355         jffs2_free_raw_inode(ri);
 356
 357         if (IS_ERR(fn)) {
 358                 /* Eeek. Wave bye bye */
 359                 mutex_unlock(&f->sem);
 360                 jffs2_complete_reservation(c);
 361                 ret = PTR_ERR(fn);
 362                 goto fail;
 363         }
 364
 365         /* We use f->target field to store the target path. */
 366         f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
 367         if (!f->target) {
 368                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 369                 mutex_unlock(&f->sem);
 370                 jffs2_complete_reservation(c);
 371                 ret = -ENOMEM;
 372                 goto fail;
 373         }
 374
 375         jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
 376                   __func__, (char *)f->target);
 377
 378         /* No data here. Only a metadata node, which will be
 379            obsoleted by the first data write
 380         */
 381         f->metadata = fn;
 382         mutex_unlock(&f->sem);
 383
 384         jffs2_complete_reservation(c);
 385
 386         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 387         if (ret)
 388                 goto fail;
 389
 390         ret = jffs2_init_acl_post(inode);
 391         if (ret)
 392                 goto fail;
 393
 394         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 395                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 396         if (ret)
 397                 goto fail;
 398
 399         rd = jffs2_alloc_raw_dirent();
 400         if (!rd) {
 401                 /* Argh. Now we treat it like a normal delete */
 402                 jffs2_complete_reservation(c);
 403                 ret = -ENOMEM;
 404                 goto fail;
 405         }
 406
 407         dir_f = JFFS2_INODE_INFO(dir_i);
 408         mutex_lock(&dir_f->sem);
 409
 410         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 411         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 412         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 413         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 414
 415         rd->pino = cpu_to_je32(dir_i->i_ino);
 416         rd->version = cpu_to_je32(++dir_f->highest_version);
 417         rd->ino = cpu_to_je32(inode->i_ino);
 418         rd->mctime = cpu_to_je32(get_seconds());
 419         rd->nsize = namelen;
 420         rd->type = DT_LNK;
 421         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 422         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 423
 424         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 425
 426         if (IS_ERR(fd)) {
 427                 /* dirent failed to write. Delete the inode normally
 428                    as if it were the final unlink() */
 429                 jffs2_complete_reservation(c);
 430                 jffs2_free_raw_dirent(rd);
 431                 mutex_unlock(&dir_f->sem);
 432                 ret = PTR_ERR(fd);
 433                 goto fail;
 434         }
 435
 436         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 437
 438         jffs2_free_raw_dirent(rd);
 439
 440         /* Link the fd into the inode's list, obsoleting an old
 441            one if necessary. */
 442         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 443
 444         mutex_unlock(&dir_f->sem);
 445         jffs2_complete_reservation(c);
 446
 447         d_instantiate(dentry, inode);
 448         unlock_new_inode(inode);
 449         return 0;
 450
 451  fail:
 452         iget_failed(inode);
 453         return ret;
 454 }
 455
 456
 457 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
 458 {
 459         struct jffs2_inode_info *f, *dir_f;
 460         struct jffs2_sb_info *c;
 461         struct inode *inode;
 462         struct jffs2_raw_inode *ri;
 463         struct jffs2_raw_dirent *rd;
 464         struct jffs2_full_dnode *fn;
 465         struct jffs2_full_dirent *fd;
 466         int namelen;
 467         uint32_t alloclen;
 468         int ret;
 469
 470         mode |= S_IFDIR;
 471
 472         ri = jffs2_alloc_raw_inode();
 473         if (!ri)
 474                 return -ENOMEM;
 475
 476         c = JFFS2_SB_INFO(dir_i->i_sb);
 477
 478         /* Try to reserve enough space for both node and dirent.
 479          * Just the node will do for now, though
 480          */
 481         namelen = dentry->d_name.len;
 482         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 483                                   JFFS2_SUMMARY_INODE_SIZE);
 484
 485         if (ret) {
 486                 jffs2_free_raw_inode(ri);
 487                 return ret;
 488         }
 489
 490         inode = jffs2_new_inode(dir_i, mode, ri);
 491
 492         if (IS_ERR(inode)) {
 493                 jffs2_free_raw_inode(ri);
 494                 jffs2_complete_reservation(c);
 495                 return PTR_ERR(inode);
 496         }
 497
 498         inode->i_op = &jffs2_dir_inode_operations;
 499         inode->i_fop = &jffs2_dir_operations;
 500
 501         f = JFFS2_INODE_INFO(inode);
 502
 503         /* Directories get nlink 2 at start */
 504         set_nlink(inode, 2);
 505         /* but ic->pino_nlink is the parent ino# */
 506         f->inocache->pino_nlink = dir_i->i_ino;
 507
 508         ri->data_crc = cpu_to_je32(0);
 509         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 510
 511         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 512
 513         jffs2_free_raw_inode(ri);
 514
 515         if (IS_ERR(fn)) {
 516                 /* Eeek. Wave bye bye */
 517                 mutex_unlock(&f->sem);
 518                 jffs2_complete_reservation(c);
 519                 ret = PTR_ERR(fn);
 520                 goto fail;
 521         }
 522         /* No data here. Only a metadata node, which will be
 523            obsoleted by the first data write
 524         */
 525         f->metadata = fn;
 526         mutex_unlock(&f->sem);
 527
 528         jffs2_complete_reservation(c);
 529
 530         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 531         if (ret)
 532                 goto fail;
 533
 534         ret = jffs2_init_acl_post(inode);
 535         if (ret)
 536                 goto fail;
 537
 538         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 539                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 540         if (ret)
 541                 goto fail;
 542
 543         rd = jffs2_alloc_raw_dirent();
 544         if (!rd) {
 545                 /* Argh. Now we treat it like a normal delete */
 546                 jffs2_complete_reservation(c);
 547                 ret = -ENOMEM;
 548                 goto fail;
 549         }
 550
 551         dir_f = JFFS2_INODE_INFO(dir_i);
 552         mutex_lock(&dir_f->sem);
 553
 554         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 555         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 556         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 557         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 558
 559         rd->pino = cpu_to_je32(dir_i->i_ino);
 560         rd->version = cpu_to_je32(++dir_f->highest_version);
 561         rd->ino = cpu_to_je32(inode->i_ino);
 562         rd->mctime = cpu_to_je32(get_seconds());
 563         rd->nsize = namelen;
 564         rd->type = DT_DIR;
 565         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 566         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 567
 568         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 569
 570         if (IS_ERR(fd)) {
 571                 /* dirent failed to write. Delete the inode normally
 572                    as if it were the final unlink() */
 573                 jffs2_complete_reservation(c);
 574                 jffs2_free_raw_dirent(rd);
 575                 mutex_unlock(&dir_f->sem);
 576                 ret = PTR_ERR(fd);
 577                 goto fail;
 578         }
 579
 580         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 581         inc_nlink(dir_i);
 582
 583         jffs2_free_raw_dirent(rd);
 584
 585         /* Link the fd into the inode's list, obsoleting an old
 586            one if necessary. */
 587         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 588
 589         mutex_unlock(&dir_f->sem);
 590         jffs2_complete_reservation(c);
 591
 592         d_instantiate(dentry, inode);
 593         unlock_new_inode(inode);
 594         return 0;
 595
 596  fail:
 597         iget_failed(inode);
 598         return ret;
 599 }
 600
 601 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 602 {
 603         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 604         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 605         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 606         struct jffs2_full_dirent *fd;
 607         int ret;
 608         uint32_t now = get_seconds();
 609
 610         for (fd = f->dents ; fd; fd = fd->next) {
 611                 if (fd->ino)
 612                         return -ENOTEMPTY;
 613         }
 614
 615         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 616                               dentry->d_name.len, f, now);
 617         if (!ret) {
 618                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 619                 clear_nlink(dentry->d_inode);
 620                 drop_nlink(dir_i);
 621         }
 622         return ret;
 623 }
 624
 625 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
 626 {
 627         struct jffs2_inode_info *f, *dir_f;
 628         struct jffs2_sb_info *c;
 629         struct inode *inode;
 630         struct jffs2_raw_inode *ri;
 631         struct jffs2_raw_dirent *rd;
 632         struct jffs2_full_dnode *fn;
 633         struct jffs2_full_dirent *fd;
 634         int namelen;
 635         union jffs2_device_node dev;
 636         int devlen = 0;
 637         uint32_t alloclen;
 638         int ret;
 639
 640         if (!new_valid_dev(rdev))
 641                 return -EINVAL;
 642
 643         ri = jffs2_alloc_raw_inode();
 644         if (!ri)
 645                 return -ENOMEM;
 646
 647         c = JFFS2_SB_INFO(dir_i->i_sb);
 648
 649         if (S_ISBLK(mode) || S_ISCHR(mode))
 650                 devlen = jffs2_encode_dev(&dev, rdev);
 651
 652         /* Try to reserve enough space for both node and dirent.
 653          * Just the node will do for now, though
 654          */
 655         namelen = dentry->d_name.len;
 656         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 657                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 658
 659         if (ret) {
 660                 jffs2_free_raw_inode(ri);
 661                 return ret;
 662         }
 663
 664         inode = jffs2_new_inode(dir_i, mode, ri);
 665
 666         if (IS_ERR(inode)) {
 667                 jffs2_free_raw_inode(ri);
 668                 jffs2_complete_reservation(c);
 669                 return PTR_ERR(inode);
 670         }
 671         inode->i_op = &jffs2_file_inode_operations;
 672         init_special_inode(inode, inode->i_mode, rdev);
 673
 674         f = JFFS2_INODE_INFO(inode);
 675
 676         ri->dsize = ri->csize = cpu_to_je32(devlen);
 677         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 678         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 679
 680         ri->compr = JFFS2_COMPR_NONE;
 681         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 682         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 683
 684         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 685
 686         jffs2_free_raw_inode(ri);
 687
 688         if (IS_ERR(fn)) {
 689                 /* Eeek. Wave bye bye */
 690                 mutex_unlock(&f->sem);
 691                 jffs2_complete_reservation(c);
 692                 ret = PTR_ERR(fn);
 693                 goto fail;
 694         }
 695         /* No data here. Only a metadata node, which will be
 696            obsoleted by the first data write
 697         */
 698         f->metadata = fn;
 699         mutex_unlock(&f->sem);
 700
 701         jffs2_complete_reservation(c);
 702
 703         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 704         if (ret)
 705                 goto fail;
 706
 707         ret = jffs2_init_acl_post(inode);
 708         if (ret)
 709                 goto fail;
 710
 711         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 712                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 713         if (ret)
 714                 goto fail;
 715
 716         rd = jffs2_alloc_raw_dirent();
 717         if (!rd) {
 718                 /* Argh. Now we treat it like a normal delete */
 719                 jffs2_complete_reservation(c);
 720                 ret = -ENOMEM;
 721                 goto fail;
 722         }
 723
 724         dir_f = JFFS2_INODE_INFO(dir_i);
 725         mutex_lock(&dir_f->sem);
 726
 727         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 728         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 729         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 730         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 731
 732         rd->pino = cpu_to_je32(dir_i->i_ino);
 733         rd->version = cpu_to_je32(++dir_f->highest_version);
 734         rd->ino = cpu_to_je32(inode->i_ino);
 735         rd->mctime = cpu_to_je32(get_seconds());
 736         rd->nsize = namelen;
 737
 738         /* XXX: This is ugly. */
 739         rd->type = (mode & S_IFMT) >> 12;
 740
 741         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 742         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 743
 744         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 745
 746         if (IS_ERR(fd)) {
 747                 /* dirent failed to write. Delete the inode normally
 748                    as if it were the final unlink() */
 749                 jffs2_complete_reservation(c);
 750                 jffs2_free_raw_dirent(rd);
 751                 mutex_unlock(&dir_f->sem);
 752                 ret = PTR_ERR(fd);
 753                 goto fail;
 754         }
 755
 756         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 757
 758         jffs2_free_raw_dirent(rd);
 759
 760         /* Link the fd into the inode's list, obsoleting an old
 761            one if necessary. */
 762         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 763
 764         mutex_unlock(&dir_f->sem);
 765         jffs2_complete_reservation(c);
 766
 767         d_instantiate(dentry, inode);
 768         unlock_new_inode(inode);
 769         return 0;
 770
 771  fail:
 772         iget_failed(inode);
 773         return ret;
 774 }
 775
 776 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 777                          struct inode *new_dir_i, struct dentry *new_dentry)
 778 {
 779         int ret;
 780         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 781         struct jffs2_inode_info *victim_f = NULL;
 782         uint8_t type;
 783         uint32_t now;
 784
 785         /* The VFS will check for us and prevent trying to rename a
 786          * file over a directory and vice versa, but if it's a directory,
 787          * the VFS can't check whether the victim is empty. The filesystem
 788          * needs to do that for itself.
 789          */
 790         if (new_dentry->d_inode) {
 791                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 792                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 793                         struct jffs2_full_dirent *fd;
 794
 795                         mutex_lock(&victim_f->sem);
 796                         for (fd = victim_f->dents; fd; fd = fd->next) {
 797                                 if (fd->ino) {
 798                                         mutex_unlock(&victim_f->sem);
 799                                         return -ENOTEMPTY;
 800                                 }
 801                         }
 802                         mutex_unlock(&victim_f->sem);
 803                 }
 804         }
 805
 806         /* XXX: We probably ought to alloc enough space for
 807            both nodes at the same time. Writing the new link,
 808            then getting -ENOSPC, is quite bad :)
 809         */
 810
 811         /* Make a hard link */
 812
 813         /* XXX: This is ugly */
 814         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 815         if (!type) type = DT_REG;
 816
 817         now = get_seconds();
 818         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 819                             old_dentry->d_inode->i_ino, type,
 820                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 821
 822         if (ret)
 823                 return ret;
 824
 825         if (victim_f) {
 826                 /* There was a victim. Kill it off nicely */
 827                 if (S_ISDIR(new_dentry->d_inode->i_mode))
 828                         clear_nlink(new_dentry->d_inode);
 829                 else
 830                         drop_nlink(new_dentry->d_inode);
 831                 /* Don't oops if the victim was a dirent pointing to an
 832                    inode which didn't exist. */
 833                 if (victim_f->inocache) {
 834                         mutex_lock(&victim_f->sem);
 835                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 836                                 victim_f->inocache->pino_nlink = 0;
 837                         else
 838                                 victim_f->inocache->pino_nlink--;
 839                         mutex_unlock(&victim_f->sem);
 840                 }
 841         }
 842
 843         /* If it was a directory we moved, and there was no victim,
 844            increase i_nlink on its new parent */
 845         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 846                 inc_nlink(new_dir_i);
 847
 848         /* Unlink the original */
 849         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 850                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 851
 852         /* We don't touch inode->i_nlink */
 853
 854         if (ret) {
 855                 /* Oh shit. We really ought to make a single node which can do both atomically */
 856                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 857                 mutex_lock(&f->sem);
 858                 inc_nlink(old_dentry->d_inode);
 859                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 860                         f->inocache->pino_nlink++;
 861                 mutex_unlock(&f->sem);
 862
 863                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 864                 /* Might as well let the VFS know */
 865                 d_instantiate(new_dentry, old_dentry->d_inode);
 866                 ihold(old_dentry->d_inode);
 867                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 868                 return ret;
 869         }
 870
 871         if (S_ISDIR(old_dentry->d_inode->i_mode))
 872                 drop_nlink(old_dir_i);
 873
 874         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 875
 876         return 0;
 877 }
 878