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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/kernel.h>
  16 #include <linux/slab.h>
  17 #include <linux/fs.h>
  18 #include <linux/crc32.h>
  19 #include <linux/jffs2.h>
  20 #include "jffs2_fs_i.h"
  21 #include "jffs2_fs_sb.h"
  22 #include <linux/time.h>
  23 #include "nodelist.h"
  24
  25 static int jffs2_readdir (struct file *, struct dir_context *);
  26
  27 static int jffs2_create (struct inode *,struct dentry *,umode_t,
  28                          bool);
  29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  30                                     unsigned int);
  31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  32 static int jffs2_unlink (struct inode *,struct dentry *);
  33 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  34 static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
  35 static int jffs2_rmdir (struct inode *,struct dentry *);
  36 static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
  37 static int jffs2_rename (struct inode *, struct dentry *,
  38                          struct inode *, struct dentry *);
  39
  40 const struct file_operations jffs2_dir_operations =
  41 {
  42         .read =         generic_read_dir,
  43         .iterate =      jffs2_readdir,
  44         .unlocked_ioctl=jffs2_ioctl,
  45         .fsync =        jffs2_fsync,
  46         .llseek =       generic_file_llseek,
  47 };
  48
  49
  50 const struct inode_operations jffs2_dir_inode_operations =
  51 {
  52         .create =       jffs2_create,
  53         .lookup =       jffs2_lookup,
  54         .link =         jffs2_link,
  55         .unlink =       jffs2_unlink,
  56         .symlink =      jffs2_symlink,
  57         .mkdir =        jffs2_mkdir,
  58         .rmdir =        jffs2_rmdir,
  59         .mknod =        jffs2_mknod,
  60         .rename =       jffs2_rename,
  61         .get_acl =      jffs2_get_acl,
  62         .set_acl =      jffs2_set_acl,
  63         .setattr =      jffs2_setattr,
  64         .setxattr =     jffs2_setxattr,
  65         .getxattr =     jffs2_getxattr,
  66         .listxattr =    jffs2_listxattr,
  67         .removexattr =  jffs2_removexattr
  68 };
  69
  70 /***********************************************************************/
  71
  72
  73 /* We keep the dirent list sorted in increasing order of name hash,
  74    and we use the same hash function as the dentries. Makes this
  75    nice and simple
  76 */
  77 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  78                                    unsigned int flags)
  79 {
  80         struct jffs2_inode_info *dir_f;
  81         struct jffs2_full_dirent *fd = NULL, *fd_list;
  82         uint32_t ino = 0;
  83         struct inode *inode = NULL;
  84
  85         jffs2_dbg(1, "jffs2_lookup()\n");
  86
  87         if (target->d_name.len > JFFS2_MAX_NAME_LEN)
  88                 return ERR_PTR(-ENAMETOOLONG);
  89
  90         dir_f = JFFS2_INODE_INFO(dir_i);
  91
  92         mutex_lock(&dir_f->sem);
  93
  94         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  95         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  96                 if (fd_list->nhash == target->d_name.hash &&
  97                     (!fd || fd_list->version > fd->version) &&
  98                     strlen(fd_list->name) == target->d_name.len &&
  99                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
 100                         fd = fd_list;
 101                 }
 102         }
 103         if (fd)
 104                 ino = fd->ino;
 105         mutex_unlock(&dir_f->sem);
 106         if (ino) {
 107                 inode = jffs2_iget(dir_i->i_sb, ino);
 108                 if (IS_ERR(inode))
 109                         pr_warn("iget() failed for ino #%u\n", ino);
 110         }
 111
 112         return d_splice_alias(inode, target);
 113 }
 114
 115 /***********************************************************************/
 116
 117
 118 static int jffs2_readdir(struct file *file, struct dir_context *ctx)
 119 {
 120         struct inode *inode = file_inode(file);
 121         struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
 122         struct jffs2_full_dirent *fd;
 123         unsigned long curofs = 1;
 124
 125         jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
 126
 127         if (!dir_emit_dots(file, ctx))
 128                 return 0;
 129
 130         mutex_lock(&f->sem);
 131         for (fd = f->dents; fd; fd = fd->next) {
 132                 curofs++;
 133                 /* First loop: curofs = 2; pos = 2 */
 134                 if (curofs < ctx->pos) {
 135                         jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 136                                   fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
 137                         continue;
 138                 }
 139                 if (!fd->ino) {
 140                         jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
 141                                   fd->name);
 142                         ctx->pos++;
 143                         continue;
 144                 }
 145                 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
 146                           (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
 147                 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
 148                         break;
 149                 ctx->pos++;
 150         }
 151         mutex_unlock(&f->sem);
 152         return 0;
 153 }
 154
 155 /***********************************************************************/
 156
 157
 158 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
 159                         umode_t mode, bool excl)
 160 {
 161         struct jffs2_raw_inode *ri;
 162         struct jffs2_inode_info *f, *dir_f;
 163         struct jffs2_sb_info *c;
 164         struct inode *inode;
 165         int ret;
 166
 167         ri = jffs2_alloc_raw_inode();
 168         if (!ri)
 169                 return -ENOMEM;
 170
 171         c = JFFS2_SB_INFO(dir_i->i_sb);
 172
 173         jffs2_dbg(1, "%s()\n", __func__);
 174
 175         inode = jffs2_new_inode(dir_i, mode, ri);
 176
 177         if (IS_ERR(inode)) {
 178                 jffs2_dbg(1, "jffs2_new_inode() failed\n");
 179                 jffs2_free_raw_inode(ri);
 180                 return PTR_ERR(inode);
 181         }
 182
 183         inode->i_op = &jffs2_file_inode_operations;
 184         inode->i_fop = &jffs2_file_operations;
 185         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 186         inode->i_mapping->nrpages = 0;
 187
 188         f = JFFS2_INODE_INFO(inode);
 189         dir_f = JFFS2_INODE_INFO(dir_i);
 190
 191         /* jffs2_do_create() will want to lock it, _after_ reserving
 192            space and taking c-alloc_sem. If we keep it locked here,
 193            lockdep gets unhappy (although it's a false positive;
 194            nothing else will be looking at this inode yet so there's
 195            no chance of AB-BA deadlock involving its f->sem). */
 196         mutex_unlock(&f->sem);
 197
 198         ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
 199         if (ret)
 200                 goto fail;
 201
 202         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 203
 204         jffs2_free_raw_inode(ri);
 205
 206         jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 207                   __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
 208                   f->inocache->pino_nlink, inode->i_mapping->nrpages);
 209
 210         unlock_new_inode(inode);
 211         d_instantiate(dentry, inode);
 212         return 0;
 213
 214  fail:
 215         iget_failed(inode);
 216         jffs2_free_raw_inode(ri);
 217         return ret;
 218 }
 219
 220 /***********************************************************************/
 221
 222
 223 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 224 {
 225         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 226         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 227         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 228         int ret;
 229         uint32_t now = get_seconds();
 230
 231         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 232                               dentry->d_name.len, dead_f, now);
 233         if (dead_f->inocache)
 234                 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink);
 235         if (!ret)
 236                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 237         return ret;
 238 }
 239 /***********************************************************************/
 240
 241
 242 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 243 {
 244         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 245         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 246         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 247         int ret;
 248         uint8_t type;
 249         uint32_t now;
 250
 251         /* Don't let people make hard links to bad inodes. */
 252         if (!f->inocache)
 253                 return -EIO;
 254
 255         if (d_is_dir(old_dentry))
 256                 return -EPERM;
 257
 258         /* XXX: This is ugly */
 259         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 260         if (!type) type = DT_REG;
 261
 262         now = get_seconds();
 263         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 264
 265         if (!ret) {
 266                 mutex_lock(&f->sem);
 267                 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink);
 268                 mutex_unlock(&f->sem);
 269                 d_instantiate(dentry, old_dentry->d_inode);
 270                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 271                 ihold(old_dentry->d_inode);
 272         }
 273         return ret;
 274 }
 275
 276 /***********************************************************************/
 277
 278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 279 {
 280         struct jffs2_inode_info *f, *dir_f;
 281         struct jffs2_sb_info *c;
 282         struct inode *inode;
 283         struct jffs2_raw_inode *ri;
 284         struct jffs2_raw_dirent *rd;
 285         struct jffs2_full_dnode *fn;
 286         struct jffs2_full_dirent *fd;
 287         int namelen;
 288         uint32_t alloclen;
 289         int ret, targetlen = strlen(target);
 290
 291         /* FIXME: If you care. We'd need to use frags for the target
 292            if it grows much more than this */
 293         if (targetlen > 254)
 294                 return -ENAMETOOLONG;
 295
 296         ri = jffs2_alloc_raw_inode();
 297
 298         if (!ri)
 299                 return -ENOMEM;
 300
 301         c = JFFS2_SB_INFO(dir_i->i_sb);
 302
 303         /* Try to reserve enough space for both node and dirent.
 304          * Just the node will do for now, though
 305          */
 306         namelen = dentry->d_name.len;
 307         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 308                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 309
 310         if (ret) {
 311                 jffs2_free_raw_inode(ri);
 312                 return ret;
 313         }
 314
 315         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 316
 317         if (IS_ERR(inode)) {
 318                 jffs2_free_raw_inode(ri);
 319                 jffs2_complete_reservation(c);
 320                 return PTR_ERR(inode);
 321         }
 322
 323         inode->i_op = &jffs2_symlink_inode_operations;
 324
 325         f = JFFS2_INODE_INFO(inode);
 326
 327         inode->i_size = targetlen;
 328         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 329         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 330         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 331
 332         ri->compr = JFFS2_COMPR_NONE;
 333         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 334         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 335
 336         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 337
 338         jffs2_free_raw_inode(ri);
 339
 340         if (IS_ERR(fn)) {
 341                 /* Eeek. Wave bye bye */
 342                 mutex_unlock(&f->sem);
 343                 jffs2_complete_reservation(c);
 344                 ret = PTR_ERR(fn);
 345                 goto fail;
 346         }
 347
 348         /* We use f->target field to store the target path. */
 349         f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
 350         if (!f->target) {
 351                 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
 352                 mutex_unlock(&f->sem);
 353                 jffs2_complete_reservation(c);
 354                 ret = -ENOMEM;
 355                 goto fail;
 356         }
 357
 358         jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
 359                   __func__, (char *)f->target);
 360
 361         /* No data here. Only a metadata node, which will be
 362            obsoleted by the first data write
 363         */
 364         f->metadata = fn;
 365         mutex_unlock(&f->sem);
 366
 367         jffs2_complete_reservation(c);
 368
 369         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 370         if (ret)
 371                 goto fail;
 372
 373         ret = jffs2_init_acl_post(inode);
 374         if (ret)
 375                 goto fail;
 376
 377         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 378                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 379         if (ret)
 380                 goto fail;
 381
 382         rd = jffs2_alloc_raw_dirent();
 383         if (!rd) {
 384                 /* Argh. Now we treat it like a normal delete */
 385                 jffs2_complete_reservation(c);
 386                 ret = -ENOMEM;
 387                 goto fail;
 388         }
 389
 390         dir_f = JFFS2_INODE_INFO(dir_i);
 391         mutex_lock(&dir_f->sem);
 392
 393         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 394         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 395         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 396         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 397
 398         rd->pino = cpu_to_je32(dir_i->i_ino);
 399         rd->version = cpu_to_je32(++dir_f->highest_version);
 400         rd->ino = cpu_to_je32(inode->i_ino);
 401         rd->mctime = cpu_to_je32(get_seconds());
 402         rd->nsize = namelen;
 403         rd->type = DT_LNK;
 404         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 405         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 406
 407         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 408
 409         if (IS_ERR(fd)) {
 410                 /* dirent failed to write. Delete the inode normally
 411                    as if it were the final unlink() */
 412                 jffs2_complete_reservation(c);
 413                 jffs2_free_raw_dirent(rd);
 414                 mutex_unlock(&dir_f->sem);
 415                 ret = PTR_ERR(fd);
 416                 goto fail;
 417         }
 418
 419         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 420
 421         jffs2_free_raw_dirent(rd);
 422
 423         /* Link the fd into the inode's list, obsoleting an old
 424            one if necessary. */
 425         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 426
 427         mutex_unlock(&dir_f->sem);
 428         jffs2_complete_reservation(c);
 429
 430         unlock_new_inode(inode);
 431         d_instantiate(dentry, inode);
 432         return 0;
 433
 434  fail:
 435         iget_failed(inode);
 436         return ret;
 437 }
 438
 439
 440 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
 441 {
 442         struct jffs2_inode_info *f, *dir_f;
 443         struct jffs2_sb_info *c;
 444         struct inode *inode;
 445         struct jffs2_raw_inode *ri;
 446         struct jffs2_raw_dirent *rd;
 447         struct jffs2_full_dnode *fn;
 448         struct jffs2_full_dirent *fd;
 449         int namelen;
 450         uint32_t alloclen;
 451         int ret;
 452
 453         mode |= S_IFDIR;
 454
 455         ri = jffs2_alloc_raw_inode();
 456         if (!ri)
 457                 return -ENOMEM;
 458
 459         c = JFFS2_SB_INFO(dir_i->i_sb);
 460
 461         /* Try to reserve enough space for both node and dirent.
 462          * Just the node will do for now, though
 463          */
 464         namelen = dentry->d_name.len;
 465         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 466                                   JFFS2_SUMMARY_INODE_SIZE);
 467
 468         if (ret) {
 469                 jffs2_free_raw_inode(ri);
 470                 return ret;
 471         }
 472
 473         inode = jffs2_new_inode(dir_i, mode, ri);
 474
 475         if (IS_ERR(inode)) {
 476                 jffs2_free_raw_inode(ri);
 477                 jffs2_complete_reservation(c);
 478                 return PTR_ERR(inode);
 479         }
 480
 481         inode->i_op = &jffs2_dir_inode_operations;
 482         inode->i_fop = &jffs2_dir_operations;
 483
 484         f = JFFS2_INODE_INFO(inode);
 485
 486         /* Directories get nlink 2 at start */
 487         set_nlink(inode, 2);
 488         /* but ic->pino_nlink is the parent ino# */
 489         f->inocache->pino_nlink = dir_i->i_ino;
 490
 491         ri->data_crc = cpu_to_je32(0);
 492         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 493
 494         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 495
 496         jffs2_free_raw_inode(ri);
 497
 498         if (IS_ERR(fn)) {
 499                 /* Eeek. Wave bye bye */
 500                 mutex_unlock(&f->sem);
 501                 jffs2_complete_reservation(c);
 502                 ret = PTR_ERR(fn);
 503                 goto fail;
 504         }
 505         /* No data here. Only a metadata node, which will be
 506            obsoleted by the first data write
 507         */
 508         f->metadata = fn;
 509         mutex_unlock(&f->sem);
 510
 511         jffs2_complete_reservation(c);
 512
 513         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 514         if (ret)
 515                 goto fail;
 516
 517         ret = jffs2_init_acl_post(inode);
 518         if (ret)
 519                 goto fail;
 520
 521         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 522                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 523         if (ret)
 524                 goto fail;
 525
 526         rd = jffs2_alloc_raw_dirent();
 527         if (!rd) {
 528                 /* Argh. Now we treat it like a normal delete */
 529                 jffs2_complete_reservation(c);
 530                 ret = -ENOMEM;
 531                 goto fail;
 532         }
 533
 534         dir_f = JFFS2_INODE_INFO(dir_i);
 535         mutex_lock(&dir_f->sem);
 536
 537         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 538         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 539         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 540         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 541
 542         rd->pino = cpu_to_je32(dir_i->i_ino);
 543         rd->version = cpu_to_je32(++dir_f->highest_version);
 544         rd->ino = cpu_to_je32(inode->i_ino);
 545         rd->mctime = cpu_to_je32(get_seconds());
 546         rd->nsize = namelen;
 547         rd->type = DT_DIR;
 548         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 549         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 550
 551         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 552
 553         if (IS_ERR(fd)) {
 554                 /* dirent failed to write. Delete the inode normally
 555                    as if it were the final unlink() */
 556                 jffs2_complete_reservation(c);
 557                 jffs2_free_raw_dirent(rd);
 558                 mutex_unlock(&dir_f->sem);
 559                 ret = PTR_ERR(fd);
 560                 goto fail;
 561         }
 562
 563         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 564         inc_nlink(dir_i);
 565
 566         jffs2_free_raw_dirent(rd);
 567
 568         /* Link the fd into the inode's list, obsoleting an old
 569            one if necessary. */
 570         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 571
 572         mutex_unlock(&dir_f->sem);
 573         jffs2_complete_reservation(c);
 574
 575         unlock_new_inode(inode);
 576         d_instantiate(dentry, inode);
 577         return 0;
 578
 579  fail:
 580         iget_failed(inode);
 581         return ret;
 582 }
 583
 584 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 585 {
 586         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 587         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 588         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 589         struct jffs2_full_dirent *fd;
 590         int ret;
 591         uint32_t now = get_seconds();
 592
 593         for (fd = f->dents ; fd; fd = fd->next) {
 594                 if (fd->ino)
 595                         return -ENOTEMPTY;
 596         }
 597
 598         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 599                               dentry->d_name.len, f, now);
 600         if (!ret) {
 601                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 602                 clear_nlink(dentry->d_inode);
 603                 drop_nlink(dir_i);
 604         }
 605         return ret;
 606 }
 607
 608 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
 609 {
 610         struct jffs2_inode_info *f, *dir_f;
 611         struct jffs2_sb_info *c;
 612         struct inode *inode;
 613         struct jffs2_raw_inode *ri;
 614         struct jffs2_raw_dirent *rd;
 615         struct jffs2_full_dnode *fn;
 616         struct jffs2_full_dirent *fd;
 617         int namelen;
 618         union jffs2_device_node dev;
 619         int devlen = 0;
 620         uint32_t alloclen;
 621         int ret;
 622
 623         if (!new_valid_dev(rdev))
 624                 return -EINVAL;
 625
 626         ri = jffs2_alloc_raw_inode();
 627         if (!ri)
 628                 return -ENOMEM;
 629
 630         c = JFFS2_SB_INFO(dir_i->i_sb);
 631
 632         if (S_ISBLK(mode) || S_ISCHR(mode))
 633                 devlen = jffs2_encode_dev(&dev, rdev);
 634
 635         /* Try to reserve enough space for both node and dirent.
 636          * Just the node will do for now, though
 637          */
 638         namelen = dentry->d_name.len;
 639         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 640                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 641
 642         if (ret) {
 643                 jffs2_free_raw_inode(ri);
 644                 return ret;
 645         }
 646
 647         inode = jffs2_new_inode(dir_i, mode, ri);
 648
 649         if (IS_ERR(inode)) {
 650                 jffs2_free_raw_inode(ri);
 651                 jffs2_complete_reservation(c);
 652                 return PTR_ERR(inode);
 653         }
 654         inode->i_op = &jffs2_file_inode_operations;
 655         init_special_inode(inode, inode->i_mode, rdev);
 656
 657         f = JFFS2_INODE_INFO(inode);
 658
 659         ri->dsize = ri->csize = cpu_to_je32(devlen);
 660         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 661         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 662
 663         ri->compr = JFFS2_COMPR_NONE;
 664         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 665         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 666
 667         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 668
 669         jffs2_free_raw_inode(ri);
 670
 671         if (IS_ERR(fn)) {
 672                 /* Eeek. Wave bye bye */
 673                 mutex_unlock(&f->sem);
 674                 jffs2_complete_reservation(c);
 675                 ret = PTR_ERR(fn);
 676                 goto fail;
 677         }
 678         /* No data here. Only a metadata node, which will be
 679            obsoleted by the first data write
 680         */
 681         f->metadata = fn;
 682         mutex_unlock(&f->sem);
 683
 684         jffs2_complete_reservation(c);
 685
 686         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 687         if (ret)
 688                 goto fail;
 689
 690         ret = jffs2_init_acl_post(inode);
 691         if (ret)
 692                 goto fail;
 693
 694         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 695                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 696         if (ret)
 697                 goto fail;
 698
 699         rd = jffs2_alloc_raw_dirent();
 700         if (!rd) {
 701                 /* Argh. Now we treat it like a normal delete */
 702                 jffs2_complete_reservation(c);
 703                 ret = -ENOMEM;
 704                 goto fail;
 705         }
 706
 707         dir_f = JFFS2_INODE_INFO(dir_i);
 708         mutex_lock(&dir_f->sem);
 709
 710         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 711         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 712         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 713         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 714
 715         rd->pino = cpu_to_je32(dir_i->i_ino);
 716         rd->version = cpu_to_je32(++dir_f->highest_version);
 717         rd->ino = cpu_to_je32(inode->i_ino);
 718         rd->mctime = cpu_to_je32(get_seconds());
 719         rd->nsize = namelen;
 720
 721         /* XXX: This is ugly. */
 722         rd->type = (mode & S_IFMT) >> 12;
 723
 724         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 725         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 726
 727         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 728
 729         if (IS_ERR(fd)) {
 730                 /* dirent failed to write. Delete the inode normally
 731                    as if it were the final unlink() */
 732                 jffs2_complete_reservation(c);
 733                 jffs2_free_raw_dirent(rd);
 734                 mutex_unlock(&dir_f->sem);
 735                 ret = PTR_ERR(fd);
 736                 goto fail;
 737         }
 738
 739         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 740
 741         jffs2_free_raw_dirent(rd);
 742
 743         /* Link the fd into the inode's list, obsoleting an old
 744            one if necessary. */
 745         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 746
 747         mutex_unlock(&dir_f->sem);
 748         jffs2_complete_reservation(c);
 749
 750         unlock_new_inode(inode);
 751         d_instantiate(dentry, inode);
 752         return 0;
 753
 754  fail:
 755         iget_failed(inode);
 756         return ret;
 757 }
 758
 759 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 760                          struct inode *new_dir_i, struct dentry *new_dentry)
 761 {
 762         int ret;
 763         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 764         struct jffs2_inode_info *victim_f = NULL;
 765         uint8_t type;
 766         uint32_t now;
 767
 768         /* The VFS will check for us and prevent trying to rename a
 769          * file over a directory and vice versa, but if it's a directory,
 770          * the VFS can't check whether the victim is empty. The filesystem
 771          * needs to do that for itself.
 772          */
 773         if (new_dentry->d_inode) {
 774                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 775                 if (d_is_dir(new_dentry)) {
 776                         struct jffs2_full_dirent *fd;
 777
 778                         mutex_lock(&victim_f->sem);
 779                         for (fd = victim_f->dents; fd; fd = fd->next) {
 780                                 if (fd->ino) {
 781                                         mutex_unlock(&victim_f->sem);
 782                                         return -ENOTEMPTY;
 783                                 }
 784                         }
 785                         mutex_unlock(&victim_f->sem);
 786                 }
 787         }
 788
 789         /* XXX: We probably ought to alloc enough space for
 790            both nodes at the same time. Writing the new link,
 791            then getting -ENOSPC, is quite bad :)
 792         */
 793
 794         /* Make a hard link */
 795
 796         /* XXX: This is ugly */
 797         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 798         if (!type) type = DT_REG;
 799
 800         now = get_seconds();
 801         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 802                             old_dentry->d_inode->i_ino, type,
 803                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 804
 805         if (ret)
 806                 return ret;
 807
 808         if (victim_f) {
 809                 /* There was a victim. Kill it off nicely */
 810                 if (d_is_dir(new_dentry))
 811                         clear_nlink(new_dentry->d_inode);
 812                 else
 813                         drop_nlink(new_dentry->d_inode);
 814                 /* Don't oops if the victim was a dirent pointing to an
 815                    inode which didn't exist. */
 816                 if (victim_f->inocache) {
 817                         mutex_lock(&victim_f->sem);
 818                         if (d_is_dir(new_dentry))
 819                                 victim_f->inocache->pino_nlink = 0;
 820                         else
 821                                 victim_f->inocache->pino_nlink--;
 822                         mutex_unlock(&victim_f->sem);
 823                 }
 824         }
 825
 826         /* If it was a directory we moved, and there was no victim,
 827            increase i_nlink on its new parent */
 828         if (d_is_dir(old_dentry) && !victim_f)
 829                 inc_nlink(new_dir_i);
 830
 831         /* Unlink the original */
 832         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 833                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 834
 835         /* We don't touch inode->i_nlink */
 836
 837         if (ret) {
 838                 /* Oh shit. We really ought to make a single node which can do both atomically */
 839                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 840                 mutex_lock(&f->sem);
 841                 inc_nlink(old_dentry->d_inode);
 842                 if (f->inocache && !d_is_dir(old_dentry))
 843                         f->inocache->pino_nlink++;
 844                 mutex_unlock(&f->sem);
 845
 846                 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
 847                           __func__, ret);
 848                 /* Might as well let the VFS know */
 849                 d_instantiate(new_dentry, old_dentry->d_inode);
 850                 ihold(old_dentry->d_inode);
 851                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 852                 return ret;
 853         }
 854
 855         if (d_is_dir(old_dentry))
 856                 drop_nlink(old_dir_i);
 857
 858         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 859
 860         return 0;
 861 }
 862