fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/fs.h>
  15 #include <linux/crc32.h>
  16 #include <linux/jffs2.h>
  17 #include "jffs2_fs_i.h"
  18 #include "jffs2_fs_sb.h"
  19 #include <linux/time.h>
  20 #include "nodelist.h"
  21
  22 static int jffs2_readdir (struct file *, void *, filldir_t);
  23
  24 static int jffs2_create (struct inode *,struct dentry *,int,
  25                          struct nameidata *);
  26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  27                                     struct nameidata *);
  28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  29 static int jffs2_unlink (struct inode *,struct dentry *);
  30 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  31 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  32 static int jffs2_rmdir (struct inode *,struct dentry *);
  33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
  34 static int jffs2_rename (struct inode *, struct dentry *,
  35                          struct inode *, struct dentry *);
  36
  37 const struct file_operations jffs2_dir_operations =
  38 {
  39         .read =         generic_read_dir,
  40         .readdir =      jffs2_readdir,
  41         .unlocked_ioctl=jffs2_ioctl,
  42         .fsync =        jffs2_fsync,
  43         .llseek =       generic_file_llseek,
  44 };
  45
  46
  47 const struct inode_operations jffs2_dir_inode_operations =
  48 {
  49         .create =       jffs2_create,
  50         .lookup =       jffs2_lookup,
  51         .link =         jffs2_link,
  52         .unlink =       jffs2_unlink,
  53         .symlink =      jffs2_symlink,
  54         .mkdir =        jffs2_mkdir,
  55         .rmdir =        jffs2_rmdir,
  56         .mknod =        jffs2_mknod,
  57         .rename =       jffs2_rename,
  58         .check_acl =    jffs2_check_acl,
  59         .setattr =      jffs2_setattr,
  60         .setxattr =     jffs2_setxattr,
  61         .getxattr =     jffs2_getxattr,
  62         .listxattr =    jffs2_listxattr,
  63         .removexattr =  jffs2_removexattr
  64 };
  65
  66 /***********************************************************************/
  67
  68
  69 /* We keep the dirent list sorted in increasing order of name hash,
  70    and we use the same hash function as the dentries. Makes this
  71    nice and simple
  72 */
  73 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  74                                    struct nameidata *nd)
  75 {
  76         struct jffs2_inode_info *dir_f;
  77         struct jffs2_sb_info *c;
  78         struct jffs2_full_dirent *fd = NULL, *fd_list;
  79         uint32_t ino = 0;
  80         struct inode *inode = NULL;
  81
  82         D1(printk(KERN_DEBUG "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         c = JFFS2_SB_INFO(dir_i->i_sb);
  89
  90         mutex_lock(&dir_f->sem);
  91
  92         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  93         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  94                 if (fd_list->nhash == target->d_name.hash &&
  95                     (!fd || fd_list->version > fd->version) &&
  96                     strlen(fd_list->name) == target->d_name.len &&
  97                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  98                         fd = fd_list;
  99                 }
 100         }
 101         if (fd)
 102                 ino = fd->ino;
 103         mutex_unlock(&dir_f->sem);
 104         if (ino) {
 105                 inode = jffs2_iget(dir_i->i_sb, ino);
 106                 if (IS_ERR(inode)) {
 107                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 108                         return ERR_CAST(inode);
 109                 }
 110         }
 111
 112         return d_splice_alias(inode, target);
 113 }
 114
 115 /***********************************************************************/
 116
 117
 118 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 119 {
 120         struct jffs2_inode_info *f;
 121         struct jffs2_sb_info *c;
 122         struct inode *inode = filp->f_path.dentry->d_inode;
 123         struct jffs2_full_dirent *fd;
 124         unsigned long offset, curofs;
 125
 126         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
 127
 128         f = JFFS2_INODE_INFO(inode);
 129         c = JFFS2_SB_INFO(inode->i_sb);
 130
 131         offset = filp->f_pos;
 132
 133         if (offset == 0) {
 134                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 135                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 136                         goto out;
 137                 offset++;
 138         }
 139         if (offset == 1) {
 140                 unsigned long pino = parent_ino(filp->f_path.dentry);
 141                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 142                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 143                         goto out;
 144                 offset++;
 145         }
 146
 147         curofs=1;
 148         mutex_lock(&f->sem);
 149         for (fd = f->dents; fd; fd = fd->next) {
 150
 151                 curofs++;
 152                 /* First loop: curofs = 2; offset = 2 */
 153                 if (curofs < offset) {
 154                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 155                                   fd->name, fd->ino, fd->type, curofs, offset));
 156                         continue;
 157                 }
 158                 if (!fd->ino) {
 159                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 160                         offset++;
 161                         continue;
 162                 }
 163                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 164                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 165                         break;
 166                 offset++;
 167         }
 168         mutex_unlock(&f->sem);
 169  out:
 170         filp->f_pos = offset;
 171         return 0;
 172 }
 173
 174 /***********************************************************************/
 175
 176
 177 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 178                         struct nameidata *nd)
 179 {
 180         struct jffs2_raw_inode *ri;
 181         struct jffs2_inode_info *f, *dir_f;
 182         struct jffs2_sb_info *c;
 183         struct inode *inode;
 184         int ret;
 185
 186         ri = jffs2_alloc_raw_inode();
 187         if (!ri)
 188                 return -ENOMEM;
 189
 190         c = JFFS2_SB_INFO(dir_i->i_sb);
 191
 192         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 193
 194         inode = jffs2_new_inode(dir_i, mode, ri);
 195
 196         if (IS_ERR(inode)) {
 197                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 198                 jffs2_free_raw_inode(ri);
 199                 return PTR_ERR(inode);
 200         }
 201
 202         inode->i_op = &jffs2_file_inode_operations;
 203         inode->i_fop = &jffs2_file_operations;
 204         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 205         inode->i_mapping->nrpages = 0;
 206
 207         f = JFFS2_INODE_INFO(inode);
 208         dir_f = JFFS2_INODE_INFO(dir_i);
 209
 210         /* jffs2_do_create() will want to lock it, _after_ reserving
 211            space and taking c-alloc_sem. If we keep it locked here,
 212            lockdep gets unhappy (although it's a false positive;
 213            nothing else will be looking at this inode yet so there's
 214            no chance of AB-BA deadlock involving its f->sem). */
 215         mutex_unlock(&f->sem);
 216
 217         ret = jffs2_do_create(c, dir_f, f, ri,
 218                               dentry->d_name.name, dentry->d_name.len);
 219         if (ret)
 220                 goto fail;
 221
 222         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 223
 224         jffs2_free_raw_inode(ri);
 225
 226         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 227                   inode->i_ino, inode->i_mode, inode->i_nlink,
 228                   f->inocache->pino_nlink, inode->i_mapping->nrpages));
 229
 230         d_instantiate(dentry, inode);
 231         unlock_new_inode(inode);
 232         return 0;
 233
 234  fail:
 235         make_bad_inode(inode);
 236         unlock_new_inode(inode);
 237         iput(inode);
 238         jffs2_free_raw_inode(ri);
 239         return ret;
 240 }
 241
 242 /***********************************************************************/
 243
 244
 245 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 246 {
 247         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 248         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 249         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 250         int ret;
 251         uint32_t now = get_seconds();
 252
 253         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 254                               dentry->d_name.len, dead_f, now);
 255         if (dead_f->inocache)
 256                 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
 257         if (!ret)
 258                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 259         return ret;
 260 }
 261 /***********************************************************************/
 262
 263
 264 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 265 {
 266         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 267         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 268         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 269         int ret;
 270         uint8_t type;
 271         uint32_t now;
 272
 273         /* Don't let people make hard links to bad inodes. */
 274         if (!f->inocache)
 275                 return -EIO;
 276
 277         if (S_ISDIR(old_dentry->d_inode->i_mode))
 278                 return -EPERM;
 279
 280         /* XXX: This is ugly */
 281         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 282         if (!type) type = DT_REG;
 283
 284         now = get_seconds();
 285         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 286
 287         if (!ret) {
 288                 mutex_lock(&f->sem);
 289                 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
 290                 mutex_unlock(&f->sem);
 291                 d_instantiate(dentry, old_dentry->d_inode);
 292                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 293                 atomic_inc(&old_dentry->d_inode->i_count);
 294         }
 295         return ret;
 296 }
 297
 298 /***********************************************************************/
 299
 300 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 301 {
 302         struct jffs2_inode_info *f, *dir_f;
 303         struct jffs2_sb_info *c;
 304         struct inode *inode;
 305         struct jffs2_raw_inode *ri;
 306         struct jffs2_raw_dirent *rd;
 307         struct jffs2_full_dnode *fn;
 308         struct jffs2_full_dirent *fd;
 309         int namelen;
 310         uint32_t alloclen;
 311         int ret, targetlen = strlen(target);
 312
 313         /* FIXME: If you care. We'd need to use frags for the target
 314            if it grows much more than this */
 315         if (targetlen > 254)
 316                 return -ENAMETOOLONG;
 317
 318         ri = jffs2_alloc_raw_inode();
 319
 320         if (!ri)
 321                 return -ENOMEM;
 322
 323         c = JFFS2_SB_INFO(dir_i->i_sb);
 324
 325         /* Try to reserve enough space for both node and dirent.
 326          * Just the node will do for now, though
 327          */
 328         namelen = dentry->d_name.len;
 329         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 330                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 331
 332         if (ret) {
 333                 jffs2_free_raw_inode(ri);
 334                 return ret;
 335         }
 336
 337         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 338
 339         if (IS_ERR(inode)) {
 340                 jffs2_free_raw_inode(ri);
 341                 jffs2_complete_reservation(c);
 342                 return PTR_ERR(inode);
 343         }
 344
 345         inode->i_op = &jffs2_symlink_inode_operations;
 346
 347         f = JFFS2_INODE_INFO(inode);
 348
 349         inode->i_size = targetlen;
 350         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 351         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 352         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 353
 354         ri->compr = JFFS2_COMPR_NONE;
 355         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 356         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 357
 358         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 359
 360         jffs2_free_raw_inode(ri);
 361
 362         if (IS_ERR(fn)) {
 363                 /* Eeek. Wave bye bye */
 364                 mutex_unlock(&f->sem);
 365                 jffs2_complete_reservation(c);
 366                 ret = PTR_ERR(fn);
 367                 goto fail;
 368         }
 369
 370         /* We use f->target field to store the target path. */
 371         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 372         if (!f->target) {
 373                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 374                 mutex_unlock(&f->sem);
 375                 jffs2_complete_reservation(c);
 376                 ret = -ENOMEM;
 377                 goto fail;
 378         }
 379
 380         memcpy(f->target, target, targetlen + 1);
 381         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 382
 383         /* No data here. Only a metadata node, which will be
 384            obsoleted by the first data write
 385         */
 386         f->metadata = fn;
 387         mutex_unlock(&f->sem);
 388
 389         jffs2_complete_reservation(c);
 390
 391         ret = jffs2_init_security(inode, dir_i);
 392         if (ret)
 393                 goto fail;
 394
 395         ret = jffs2_init_acl_post(inode);
 396         if (ret)
 397                 goto fail;
 398
 399         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 400                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 401         if (ret)
 402                 goto fail;
 403
 404         rd = jffs2_alloc_raw_dirent();
 405         if (!rd) {
 406                 /* Argh. Now we treat it like a normal delete */
 407                 jffs2_complete_reservation(c);
 408                 ret = -ENOMEM;
 409                 goto fail;
 410         }
 411
 412         dir_f = JFFS2_INODE_INFO(dir_i);
 413         mutex_lock(&dir_f->sem);
 414
 415         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 416         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 417         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 418         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 419
 420         rd->pino = cpu_to_je32(dir_i->i_ino);
 421         rd->version = cpu_to_je32(++dir_f->highest_version);
 422         rd->ino = cpu_to_je32(inode->i_ino);
 423         rd->mctime = cpu_to_je32(get_seconds());
 424         rd->nsize = namelen;
 425         rd->type = DT_LNK;
 426         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 427         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 428
 429         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 430
 431         if (IS_ERR(fd)) {
 432                 /* dirent failed to write. Delete the inode normally
 433                    as if it were the final unlink() */
 434                 jffs2_complete_reservation(c);
 435                 jffs2_free_raw_dirent(rd);
 436                 mutex_unlock(&dir_f->sem);
 437                 ret = PTR_ERR(fd);
 438                 goto fail;
 439         }
 440
 441         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 442
 443         jffs2_free_raw_dirent(rd);
 444
 445         /* Link the fd into the inode's list, obsoleting an old
 446            one if necessary. */
 447         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 448
 449         mutex_unlock(&dir_f->sem);
 450         jffs2_complete_reservation(c);
 451
 452         d_instantiate(dentry, inode);
 453         unlock_new_inode(inode);
 454         return 0;
 455
 456  fail:
 457         make_bad_inode(inode);
 458         unlock_new_inode(inode);
 459         iput(inode);
 460         return ret;
 461 }
 462
 463
 464 static 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
 508         f = JFFS2_INODE_INFO(inode);
 509
 510         /* Directories get nlink 2 at start */
 511         inode->i_nlink = 2;
 512         /* but ic->pino_nlink is the parent ino# */
 513         f->inocache->pino_nlink = dir_i->i_ino;
 514
 515         ri->data_crc = cpu_to_je32(0);
 516         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 517
 518         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 519
 520         jffs2_free_raw_inode(ri);
 521
 522         if (IS_ERR(fn)) {
 523                 /* Eeek. Wave bye bye */
 524                 mutex_unlock(&f->sem);
 525                 jffs2_complete_reservation(c);
 526                 ret = PTR_ERR(fn);
 527                 goto fail;
 528         }
 529         /* No data here. Only a metadata node, which will be
 530            obsoleted by the first data write
 531         */
 532         f->metadata = fn;
 533         mutex_unlock(&f->sem);
 534
 535         jffs2_complete_reservation(c);
 536
 537         ret = jffs2_init_security(inode, dir_i);
 538         if (ret)
 539                 goto fail;
 540
 541         ret = jffs2_init_acl_post(inode);
 542         if (ret)
 543                 goto fail;
 544
 545         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 546                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 547         if (ret)
 548                 goto fail;
 549
 550         rd = jffs2_alloc_raw_dirent();
 551         if (!rd) {
 552                 /* Argh. Now we treat it like a normal delete */
 553                 jffs2_complete_reservation(c);
 554                 ret = -ENOMEM;
 555                 goto fail;
 556         }
 557
 558         dir_f = JFFS2_INODE_INFO(dir_i);
 559         mutex_lock(&dir_f->sem);
 560
 561         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 562         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 563         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 564         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 565
 566         rd->pino = cpu_to_je32(dir_i->i_ino);
 567         rd->version = cpu_to_je32(++dir_f->highest_version);
 568         rd->ino = cpu_to_je32(inode->i_ino);
 569         rd->mctime = cpu_to_je32(get_seconds());
 570         rd->nsize = namelen;
 571         rd->type = DT_DIR;
 572         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 573         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 574
 575         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 576
 577         if (IS_ERR(fd)) {
 578                 /* dirent failed to write. Delete the inode normally
 579                    as if it were the final unlink() */
 580                 jffs2_complete_reservation(c);
 581                 jffs2_free_raw_dirent(rd);
 582                 mutex_unlock(&dir_f->sem);
 583                 ret = PTR_ERR(fd);
 584                 goto fail;
 585         }
 586
 587         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 588         inc_nlink(dir_i);
 589
 590         jffs2_free_raw_dirent(rd);
 591
 592         /* Link the fd into the inode's list, obsoleting an old
 593            one if necessary. */
 594         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 595
 596         mutex_unlock(&dir_f->sem);
 597         jffs2_complete_reservation(c);
 598
 599         d_instantiate(dentry, inode);
 600         unlock_new_inode(inode);
 601         return 0;
 602
 603  fail:
 604         make_bad_inode(inode);
 605         unlock_new_inode(inode);
 606         iput(inode);
 607         return ret;
 608 }
 609
 610 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 611 {
 612         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 613         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 614         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 615         struct jffs2_full_dirent *fd;
 616         int ret;
 617         uint32_t now = get_seconds();
 618
 619         for (fd = f->dents ; fd; fd = fd->next) {
 620                 if (fd->ino)
 621                         return -ENOTEMPTY;
 622         }
 623
 624         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 625                               dentry->d_name.len, f, now);
 626         if (!ret) {
 627                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 628                 clear_nlink(dentry->d_inode);
 629                 drop_nlink(dir_i);
 630         }
 631         return ret;
 632 }
 633
 634 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 635 {
 636         struct jffs2_inode_info *f, *dir_f;
 637         struct jffs2_sb_info *c;
 638         struct inode *inode;
 639         struct jffs2_raw_inode *ri;
 640         struct jffs2_raw_dirent *rd;
 641         struct jffs2_full_dnode *fn;
 642         struct jffs2_full_dirent *fd;
 643         int namelen;
 644         union jffs2_device_node dev;
 645         int devlen = 0;
 646         uint32_t alloclen;
 647         int ret;
 648
 649         if (!new_valid_dev(rdev))
 650                 return -EINVAL;
 651
 652         ri = jffs2_alloc_raw_inode();
 653         if (!ri)
 654                 return -ENOMEM;
 655
 656         c = JFFS2_SB_INFO(dir_i->i_sb);
 657
 658         if (S_ISBLK(mode) || S_ISCHR(mode))
 659                 devlen = jffs2_encode_dev(&dev, rdev);
 660
 661         /* Try to reserve enough space for both node and dirent.
 662          * Just the node will do for now, though
 663          */
 664         namelen = dentry->d_name.len;
 665         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 666                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 667
 668         if (ret) {
 669                 jffs2_free_raw_inode(ri);
 670                 return ret;
 671         }
 672
 673         inode = jffs2_new_inode(dir_i, mode, ri);
 674
 675         if (IS_ERR(inode)) {
 676                 jffs2_free_raw_inode(ri);
 677                 jffs2_complete_reservation(c);
 678                 return PTR_ERR(inode);
 679         }
 680         inode->i_op = &jffs2_file_inode_operations;
 681         init_special_inode(inode, inode->i_mode, rdev);
 682
 683         f = JFFS2_INODE_INFO(inode);
 684
 685         ri->dsize = ri->csize = cpu_to_je32(devlen);
 686         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 687         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 688
 689         ri->compr = JFFS2_COMPR_NONE;
 690         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 691         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 692
 693         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 694
 695         jffs2_free_raw_inode(ri);
 696
 697         if (IS_ERR(fn)) {
 698                 /* Eeek. Wave bye bye */
 699                 mutex_unlock(&f->sem);
 700                 jffs2_complete_reservation(c);
 701                 ret = PTR_ERR(fn);
 702                 goto fail;
 703         }
 704         /* No data here. Only a metadata node, which will be
 705            obsoleted by the first data write
 706         */
 707         f->metadata = fn;
 708         mutex_unlock(&f->sem);
 709
 710         jffs2_complete_reservation(c);
 711
 712         ret = jffs2_init_security(inode, dir_i);
 713         if (ret)
 714                 goto fail;
 715
 716         ret = jffs2_init_acl_post(inode);
 717         if (ret)
 718                 goto fail;
 719
 720         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 721                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 722         if (ret)
 723                 goto fail;
 724
 725         rd = jffs2_alloc_raw_dirent();
 726         if (!rd) {
 727                 /* Argh. Now we treat it like a normal delete */
 728                 jffs2_complete_reservation(c);
 729                 ret = -ENOMEM;
 730                 goto fail;
 731         }
 732
 733         dir_f = JFFS2_INODE_INFO(dir_i);
 734         mutex_lock(&dir_f->sem);
 735
 736         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 737         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 738         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 739         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 740
 741         rd->pino = cpu_to_je32(dir_i->i_ino);
 742         rd->version = cpu_to_je32(++dir_f->highest_version);
 743         rd->ino = cpu_to_je32(inode->i_ino);
 744         rd->mctime = cpu_to_je32(get_seconds());
 745         rd->nsize = namelen;
 746
 747         /* XXX: This is ugly. */
 748         rd->type = (mode & S_IFMT) >> 12;
 749
 750         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 751         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 752
 753         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 754
 755         if (IS_ERR(fd)) {
 756                 /* dirent failed to write. Delete the inode normally
 757                    as if it were the final unlink() */
 758                 jffs2_complete_reservation(c);
 759                 jffs2_free_raw_dirent(rd);
 760                 mutex_unlock(&dir_f->sem);
 761                 ret = PTR_ERR(fd);
 762                 goto fail;
 763         }
 764
 765         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 766
 767         jffs2_free_raw_dirent(rd);
 768
 769         /* Link the fd into the inode's list, obsoleting an old
 770            one if necessary. */
 771         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 772
 773         mutex_unlock(&dir_f->sem);
 774         jffs2_complete_reservation(c);
 775
 776         d_instantiate(dentry, inode);
 777         unlock_new_inode(inode);
 778         return 0;
 779
 780  fail:
 781         make_bad_inode(inode);
 782         unlock_new_inode(inode);
 783         iput(inode);
 784         return ret;
 785 }
 786
 787 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 788                          struct inode *new_dir_i, struct dentry *new_dentry)
 789 {
 790         int ret;
 791         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 792         struct jffs2_inode_info *victim_f = NULL;
 793         uint8_t type;
 794         uint32_t now;
 795
 796         /* The VFS will check for us and prevent trying to rename a
 797          * file over a directory and vice versa, but if it's a directory,
 798          * the VFS can't check whether the victim is empty. The filesystem
 799          * needs to do that for itself.
 800          */
 801         if (new_dentry->d_inode) {
 802                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 803                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 804                         struct jffs2_full_dirent *fd;
 805
 806                         mutex_lock(&victim_f->sem);
 807                         for (fd = victim_f->dents; fd; fd = fd->next) {
 808                                 if (fd->ino) {
 809                                         mutex_unlock(&victim_f->sem);
 810                                         return -ENOTEMPTY;
 811                                 }
 812                         }
 813                         mutex_unlock(&victim_f->sem);
 814                 }
 815         }
 816
 817         /* XXX: We probably ought to alloc enough space for
 818            both nodes at the same time. Writing the new link,
 819            then getting -ENOSPC, is quite bad :)
 820         */
 821
 822         /* Make a hard link */
 823
 824         /* XXX: This is ugly */
 825         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 826         if (!type) type = DT_REG;
 827
 828         now = get_seconds();
 829         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 830                             old_dentry->d_inode->i_ino, type,
 831                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 832
 833         if (ret)
 834                 return ret;
 835
 836         if (victim_f) {
 837                 /* There was a victim. Kill it off nicely */
 838                 drop_nlink(new_dentry->d_inode);
 839                 /* Don't oops if the victim was a dirent pointing to an
 840                    inode which didn't exist. */
 841                 if (victim_f->inocache) {
 842                         mutex_lock(&victim_f->sem);
 843                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 844                                 victim_f->inocache->pino_nlink = 0;
 845                         else
 846                                 victim_f->inocache->pino_nlink--;
 847                         mutex_unlock(&victim_f->sem);
 848                 }
 849         }
 850
 851         /* If it was a directory we moved, and there was no victim,
 852            increase i_nlink on its new parent */
 853         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 854                 inc_nlink(new_dir_i);
 855
 856         /* Unlink the original */
 857         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 858                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 859
 860         /* We don't touch inode->i_nlink */
 861
 862         if (ret) {
 863                 /* Oh shit. We really ought to make a single node which can do both atomically */
 864                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 865                 mutex_lock(&f->sem);
 866                 inc_nlink(old_dentry->d_inode);
 867                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 868                         f->inocache->pino_nlink++;
 869                 mutex_unlock(&f->sem);
 870
 871                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 872                 /* Might as well let the VFS know */
 873                 d_instantiate(new_dentry, old_dentry->d_inode);
 874                 atomic_inc(&old_dentry->d_inode->i_count);
 875                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 876                 return ret;
 877         }
 878
 879         if (S_ISDIR(old_dentry->d_inode->i_mode))
 880                 drop_nlink(old_dir_i);
 881
 882         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 883
 884         return 0;
 885 }
 886