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 *,int,
  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 *,int);
  33 static int jffs2_rmdir (struct inode *,struct dentry *);
  34 static int jffs2_mknod (struct inode *,struct dentry *,int,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         .check_acl =    jffs2_check_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         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
  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                         return ERR_CAST(inode);
 108                 }
 109         }
 110
 111         return d_splice_alias(inode, target);
 112 }
 113
 114 /***********************************************************************/
 115
 116
 117 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 118 {
 119         struct jffs2_inode_info *f;
 120         struct inode *inode = filp->f_path.dentry->d_inode;
 121         struct jffs2_full_dirent *fd;
 122         unsigned long offset, curofs;
 123
 124         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
 125
 126         f = JFFS2_INODE_INFO(inode);
 127
 128         offset = filp->f_pos;
 129
 130         if (offset == 0) {
 131                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 132                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 133                         goto out;
 134                 offset++;
 135         }
 136         if (offset == 1) {
 137                 unsigned long pino = parent_ino(filp->f_path.dentry);
 138                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 139                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 140                         goto out;
 141                 offset++;
 142         }
 143
 144         curofs=1;
 145         mutex_lock(&f->sem);
 146         for (fd = f->dents; fd; fd = fd->next) {
 147
 148                 curofs++;
 149                 /* First loop: curofs = 2; offset = 2 */
 150                 if (curofs < offset) {
 151                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 152                                   fd->name, fd->ino, fd->type, curofs, offset));
 153                         continue;
 154                 }
 155                 if (!fd->ino) {
 156                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 157                         offset++;
 158                         continue;
 159                 }
 160                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 161                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 162                         break;
 163                 offset++;
 164         }
 165         mutex_unlock(&f->sem);
 166  out:
 167         filp->f_pos = offset;
 168         return 0;
 169 }
 170
 171 /***********************************************************************/
 172
 173
 174 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 175                         struct nameidata *nd)
 176 {
 177         struct jffs2_raw_inode *ri;
 178         struct jffs2_inode_info *f, *dir_f;
 179         struct jffs2_sb_info *c;
 180         struct inode *inode;
 181         int ret;
 182
 183         ri = jffs2_alloc_raw_inode();
 184         if (!ri)
 185                 return -ENOMEM;
 186
 187         c = JFFS2_SB_INFO(dir_i->i_sb);
 188
 189         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 190
 191         inode = jffs2_new_inode(dir_i, mode, ri);
 192
 193         if (IS_ERR(inode)) {
 194                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 195                 jffs2_free_raw_inode(ri);
 196                 return PTR_ERR(inode);
 197         }
 198
 199         inode->i_op = &jffs2_file_inode_operations;
 200         inode->i_fop = &jffs2_file_operations;
 201         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 202         inode->i_mapping->nrpages = 0;
 203
 204         f = JFFS2_INODE_INFO(inode);
 205         dir_f = JFFS2_INODE_INFO(dir_i);
 206
 207         /* jffs2_do_create() will want to lock it, _after_ reserving
 208            space and taking c-alloc_sem. If we keep it locked here,
 209            lockdep gets unhappy (although it's a false positive;
 210            nothing else will be looking at this inode yet so there's
 211            no chance of AB-BA deadlock involving its f->sem). */
 212         mutex_unlock(&f->sem);
 213
 214         ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
 215         if (ret)
 216                 goto fail;
 217
 218         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 219
 220         jffs2_free_raw_inode(ri);
 221
 222         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 223                   inode->i_ino, inode->i_mode, inode->i_nlink,
 224                   f->inocache->pino_nlink, inode->i_mapping->nrpages));
 225
 226         d_instantiate(dentry, inode);
 227         unlock_new_inode(inode);
 228         return 0;
 229
 230  fail:
 231         iget_failed(inode);
 232         jffs2_free_raw_inode(ri);
 233         return ret;
 234 }
 235
 236 /***********************************************************************/
 237
 238
 239 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 240 {
 241         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 242         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 243         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 244         int ret;
 245         uint32_t now = get_seconds();
 246
 247         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 248                               dentry->d_name.len, dead_f, now);
 249         if (dead_f->inocache)
 250                 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
 251         if (!ret)
 252                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 253         return ret;
 254 }
 255 /***********************************************************************/
 256
 257
 258 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 259 {
 260         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 261         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 262         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 263         int ret;
 264         uint8_t type;
 265         uint32_t now;
 266
 267         /* Don't let people make hard links to bad inodes. */
 268         if (!f->inocache)
 269                 return -EIO;
 270
 271         if (S_ISDIR(old_dentry->d_inode->i_mode))
 272                 return -EPERM;
 273
 274         /* XXX: This is ugly */
 275         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 276         if (!type) type = DT_REG;
 277
 278         now = get_seconds();
 279         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 280
 281         if (!ret) {
 282                 mutex_lock(&f->sem);
 283                 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
 284                 mutex_unlock(&f->sem);
 285                 d_instantiate(dentry, old_dentry->d_inode);
 286                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 287                 ihold(old_dentry->d_inode);
 288         }
 289         return ret;
 290 }
 291
 292 /***********************************************************************/
 293
 294 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 295 {
 296         struct jffs2_inode_info *f, *dir_f;
 297         struct jffs2_sb_info *c;
 298         struct inode *inode;
 299         struct jffs2_raw_inode *ri;
 300         struct jffs2_raw_dirent *rd;
 301         struct jffs2_full_dnode *fn;
 302         struct jffs2_full_dirent *fd;
 303         int namelen;
 304         uint32_t alloclen;
 305         int ret, targetlen = strlen(target);
 306
 307         /* FIXME: If you care. We'd need to use frags for the target
 308            if it grows much more than this */
 309         if (targetlen > 254)
 310                 return -ENAMETOOLONG;
 311
 312         ri = jffs2_alloc_raw_inode();
 313
 314         if (!ri)
 315                 return -ENOMEM;
 316
 317         c = JFFS2_SB_INFO(dir_i->i_sb);
 318
 319         /* Try to reserve enough space for both node and dirent.
 320          * Just the node will do for now, though
 321          */
 322         namelen = dentry->d_name.len;
 323         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 324                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 325
 326         if (ret) {
 327                 jffs2_free_raw_inode(ri);
 328                 return ret;
 329         }
 330
 331         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 332
 333         if (IS_ERR(inode)) {
 334                 jffs2_free_raw_inode(ri);
 335                 jffs2_complete_reservation(c);
 336                 return PTR_ERR(inode);
 337         }
 338
 339         inode->i_op = &jffs2_symlink_inode_operations;
 340
 341         f = JFFS2_INODE_INFO(inode);
 342
 343         inode->i_size = targetlen;
 344         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 345         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 346         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 347
 348         ri->compr = JFFS2_COMPR_NONE;
 349         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 350         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 351
 352         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 353
 354         jffs2_free_raw_inode(ri);
 355
 356         if (IS_ERR(fn)) {
 357                 /* Eeek. Wave bye bye */
 358                 mutex_unlock(&f->sem);
 359                 jffs2_complete_reservation(c);
 360                 ret = PTR_ERR(fn);
 361                 goto fail;
 362         }
 363
 364         /* We use f->target field to store the target path. */
 365         f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
 366         if (!f->target) {
 367                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 368                 mutex_unlock(&f->sem);
 369                 jffs2_complete_reservation(c);
 370                 ret = -ENOMEM;
 371                 goto fail;
 372         }
 373
 374         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 375
 376         /* No data here. Only a metadata node, which will be
 377            obsoleted by the first data write
 378         */
 379         f->metadata = fn;
 380         mutex_unlock(&f->sem);
 381
 382         jffs2_complete_reservation(c);
 383
 384         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 385         if (ret)
 386                 goto fail;
 387
 388         ret = jffs2_init_acl_post(inode);
 389         if (ret)
 390                 goto fail;
 391
 392         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 393                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 394         if (ret)
 395                 goto fail;
 396
 397         rd = jffs2_alloc_raw_dirent();
 398         if (!rd) {
 399                 /* Argh. Now we treat it like a normal delete */
 400                 jffs2_complete_reservation(c);
 401                 ret = -ENOMEM;
 402                 goto fail;
 403         }
 404
 405         dir_f = JFFS2_INODE_INFO(dir_i);
 406         mutex_lock(&dir_f->sem);
 407
 408         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 409         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 410         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 411         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 412
 413         rd->pino = cpu_to_je32(dir_i->i_ino);
 414         rd->version = cpu_to_je32(++dir_f->highest_version);
 415         rd->ino = cpu_to_je32(inode->i_ino);
 416         rd->mctime = cpu_to_je32(get_seconds());
 417         rd->nsize = namelen;
 418         rd->type = DT_LNK;
 419         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 420         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 421
 422         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 423
 424         if (IS_ERR(fd)) {
 425                 /* dirent failed to write. Delete the inode normally
 426                    as if it were the final unlink() */
 427                 jffs2_complete_reservation(c);
 428                 jffs2_free_raw_dirent(rd);
 429                 mutex_unlock(&dir_f->sem);
 430                 ret = PTR_ERR(fd);
 431                 goto fail;
 432         }
 433
 434         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 435
 436         jffs2_free_raw_dirent(rd);
 437
 438         /* Link the fd into the inode's list, obsoleting an old
 439            one if necessary. */
 440         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 441
 442         mutex_unlock(&dir_f->sem);
 443         jffs2_complete_reservation(c);
 444
 445         d_instantiate(dentry, inode);
 446         unlock_new_inode(inode);
 447         return 0;
 448
 449  fail:
 450         iget_failed(inode);
 451         return ret;
 452 }
 453
 454
 455 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 456 {
 457         struct jffs2_inode_info *f, *dir_f;
 458         struct jffs2_sb_info *c;
 459         struct inode *inode;
 460         struct jffs2_raw_inode *ri;
 461         struct jffs2_raw_dirent *rd;
 462         struct jffs2_full_dnode *fn;
 463         struct jffs2_full_dirent *fd;
 464         int namelen;
 465         uint32_t alloclen;
 466         int ret;
 467
 468         mode |= S_IFDIR;
 469
 470         ri = jffs2_alloc_raw_inode();
 471         if (!ri)
 472                 return -ENOMEM;
 473
 474         c = JFFS2_SB_INFO(dir_i->i_sb);
 475
 476         /* Try to reserve enough space for both node and dirent.
 477          * Just the node will do for now, though
 478          */
 479         namelen = dentry->d_name.len;
 480         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 481                                   JFFS2_SUMMARY_INODE_SIZE);
 482
 483         if (ret) {
 484                 jffs2_free_raw_inode(ri);
 485                 return ret;
 486         }
 487
 488         inode = jffs2_new_inode(dir_i, mode, ri);
 489
 490         if (IS_ERR(inode)) {
 491                 jffs2_free_raw_inode(ri);
 492                 jffs2_complete_reservation(c);
 493                 return PTR_ERR(inode);
 494         }
 495
 496         inode->i_op = &jffs2_dir_inode_operations;
 497         inode->i_fop = &jffs2_dir_operations;
 498
 499         f = JFFS2_INODE_INFO(inode);
 500
 501         /* Directories get nlink 2 at start */
 502         inode->i_nlink = 2;
 503         /* but ic->pino_nlink is the parent ino# */
 504         f->inocache->pino_nlink = dir_i->i_ino;
 505
 506         ri->data_crc = cpu_to_je32(0);
 507         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 508
 509         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 510
 511         jffs2_free_raw_inode(ri);
 512
 513         if (IS_ERR(fn)) {
 514                 /* Eeek. Wave bye bye */
 515                 mutex_unlock(&f->sem);
 516                 jffs2_complete_reservation(c);
 517                 ret = PTR_ERR(fn);
 518                 goto fail;
 519         }
 520         /* No data here. Only a metadata node, which will be
 521            obsoleted by the first data write
 522         */
 523         f->metadata = fn;
 524         mutex_unlock(&f->sem);
 525
 526         jffs2_complete_reservation(c);
 527
 528         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 529         if (ret)
 530                 goto fail;
 531
 532         ret = jffs2_init_acl_post(inode);
 533         if (ret)
 534                 goto fail;
 535
 536         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 537                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 538         if (ret)
 539                 goto fail;
 540
 541         rd = jffs2_alloc_raw_dirent();
 542         if (!rd) {
 543                 /* Argh. Now we treat it like a normal delete */
 544                 jffs2_complete_reservation(c);
 545                 ret = -ENOMEM;
 546                 goto fail;
 547         }
 548
 549         dir_f = JFFS2_INODE_INFO(dir_i);
 550         mutex_lock(&dir_f->sem);
 551
 552         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 553         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 554         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 555         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 556
 557         rd->pino = cpu_to_je32(dir_i->i_ino);
 558         rd->version = cpu_to_je32(++dir_f->highest_version);
 559         rd->ino = cpu_to_je32(inode->i_ino);
 560         rd->mctime = cpu_to_je32(get_seconds());
 561         rd->nsize = namelen;
 562         rd->type = DT_DIR;
 563         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 564         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 565
 566         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 567
 568         if (IS_ERR(fd)) {
 569                 /* dirent failed to write. Delete the inode normally
 570                    as if it were the final unlink() */
 571                 jffs2_complete_reservation(c);
 572                 jffs2_free_raw_dirent(rd);
 573                 mutex_unlock(&dir_f->sem);
 574                 ret = PTR_ERR(fd);
 575                 goto fail;
 576         }
 577
 578         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 579         inc_nlink(dir_i);
 580
 581         jffs2_free_raw_dirent(rd);
 582
 583         /* Link the fd into the inode's list, obsoleting an old
 584            one if necessary. */
 585         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 586
 587         mutex_unlock(&dir_f->sem);
 588         jffs2_complete_reservation(c);
 589
 590         d_instantiate(dentry, inode);
 591         unlock_new_inode(inode);
 592         return 0;
 593
 594  fail:
 595         iget_failed(inode);
 596         return ret;
 597 }
 598
 599 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 600 {
 601         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 602         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 603         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 604         struct jffs2_full_dirent *fd;
 605         int ret;
 606         uint32_t now = get_seconds();
 607
 608         for (fd = f->dents ; fd; fd = fd->next) {
 609                 if (fd->ino)
 610                         return -ENOTEMPTY;
 611         }
 612
 613         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 614                               dentry->d_name.len, f, now);
 615         if (!ret) {
 616                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 617                 clear_nlink(dentry->d_inode);
 618                 drop_nlink(dir_i);
 619         }
 620         return ret;
 621 }
 622
 623 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 624 {
 625         struct jffs2_inode_info *f, *dir_f;
 626         struct jffs2_sb_info *c;
 627         struct inode *inode;
 628         struct jffs2_raw_inode *ri;
 629         struct jffs2_raw_dirent *rd;
 630         struct jffs2_full_dnode *fn;
 631         struct jffs2_full_dirent *fd;
 632         int namelen;
 633         union jffs2_device_node dev;
 634         int devlen = 0;
 635         uint32_t alloclen;
 636         int ret;
 637
 638         if (!new_valid_dev(rdev))
 639                 return -EINVAL;
 640
 641         ri = jffs2_alloc_raw_inode();
 642         if (!ri)
 643                 return -ENOMEM;
 644
 645         c = JFFS2_SB_INFO(dir_i->i_sb);
 646
 647         if (S_ISBLK(mode) || S_ISCHR(mode))
 648                 devlen = jffs2_encode_dev(&dev, rdev);
 649
 650         /* Try to reserve enough space for both node and dirent.
 651          * Just the node will do for now, though
 652          */
 653         namelen = dentry->d_name.len;
 654         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 655                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 656
 657         if (ret) {
 658                 jffs2_free_raw_inode(ri);
 659                 return ret;
 660         }
 661
 662         inode = jffs2_new_inode(dir_i, mode, ri);
 663
 664         if (IS_ERR(inode)) {
 665                 jffs2_free_raw_inode(ri);
 666                 jffs2_complete_reservation(c);
 667                 return PTR_ERR(inode);
 668         }
 669         inode->i_op = &jffs2_file_inode_operations;
 670         init_special_inode(inode, inode->i_mode, rdev);
 671
 672         f = JFFS2_INODE_INFO(inode);
 673
 674         ri->dsize = ri->csize = cpu_to_je32(devlen);
 675         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 676         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 677
 678         ri->compr = JFFS2_COMPR_NONE;
 679         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 680         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 681
 682         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 683
 684         jffs2_free_raw_inode(ri);
 685
 686         if (IS_ERR(fn)) {
 687                 /* Eeek. Wave bye bye */
 688                 mutex_unlock(&f->sem);
 689                 jffs2_complete_reservation(c);
 690                 ret = PTR_ERR(fn);
 691                 goto fail;
 692         }
 693         /* No data here. Only a metadata node, which will be
 694            obsoleted by the first data write
 695         */
 696         f->metadata = fn;
 697         mutex_unlock(&f->sem);
 698
 699         jffs2_complete_reservation(c);
 700
 701         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 702         if (ret)
 703                 goto fail;
 704
 705         ret = jffs2_init_acl_post(inode);
 706         if (ret)
 707                 goto fail;
 708
 709         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 710                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 711         if (ret)
 712                 goto fail;
 713
 714         rd = jffs2_alloc_raw_dirent();
 715         if (!rd) {
 716                 /* Argh. Now we treat it like a normal delete */
 717                 jffs2_complete_reservation(c);
 718                 ret = -ENOMEM;
 719                 goto fail;
 720         }
 721
 722         dir_f = JFFS2_INODE_INFO(dir_i);
 723         mutex_lock(&dir_f->sem);
 724
 725         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 726         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 727         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 728         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 729
 730         rd->pino = cpu_to_je32(dir_i->i_ino);
 731         rd->version = cpu_to_je32(++dir_f->highest_version);
 732         rd->ino = cpu_to_je32(inode->i_ino);
 733         rd->mctime = cpu_to_je32(get_seconds());
 734         rd->nsize = namelen;
 735
 736         /* XXX: This is ugly. */
 737         rd->type = (mode & S_IFMT) >> 12;
 738
 739         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 740         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 741
 742         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 743
 744         if (IS_ERR(fd)) {
 745                 /* dirent failed to write. Delete the inode normally
 746                    as if it were the final unlink() */
 747                 jffs2_complete_reservation(c);
 748                 jffs2_free_raw_dirent(rd);
 749                 mutex_unlock(&dir_f->sem);
 750                 ret = PTR_ERR(fd);
 751                 goto fail;
 752         }
 753
 754         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 755
 756         jffs2_free_raw_dirent(rd);
 757
 758         /* Link the fd into the inode's list, obsoleting an old
 759            one if necessary. */
 760         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 761
 762         mutex_unlock(&dir_f->sem);
 763         jffs2_complete_reservation(c);
 764
 765         d_instantiate(dentry, inode);
 766         unlock_new_inode(inode);
 767         return 0;
 768
 769  fail:
 770         iget_failed(inode);
 771         return ret;
 772 }
 773
 774 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 775                          struct inode *new_dir_i, struct dentry *new_dentry)
 776 {
 777         int ret;
 778         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 779         struct jffs2_inode_info *victim_f = NULL;
 780         uint8_t type;
 781         uint32_t now;
 782
 783         /* The VFS will check for us and prevent trying to rename a
 784          * file over a directory and vice versa, but if it's a directory,
 785          * the VFS can't check whether the victim is empty. The filesystem
 786          * needs to do that for itself.
 787          */
 788         if (new_dentry->d_inode) {
 789                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 790                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 791                         struct jffs2_full_dirent *fd;
 792
 793                         mutex_lock(&victim_f->sem);
 794                         for (fd = victim_f->dents; fd; fd = fd->next) {
 795                                 if (fd->ino) {
 796                                         mutex_unlock(&victim_f->sem);
 797                                         return -ENOTEMPTY;
 798                                 }
 799                         }
 800                         mutex_unlock(&victim_f->sem);
 801                 }
 802         }
 803
 804         /* XXX: We probably ought to alloc enough space for
 805            both nodes at the same time. Writing the new link,
 806            then getting -ENOSPC, is quite bad :)
 807         */
 808
 809         /* Make a hard link */
 810
 811         /* XXX: This is ugly */
 812         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 813         if (!type) type = DT_REG;
 814
 815         now = get_seconds();
 816         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 817                             old_dentry->d_inode->i_ino, type,
 818                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 819
 820         if (ret)
 821                 return ret;
 822
 823         if (victim_f) {
 824                 /* There was a victim. Kill it off nicely */
 825                 drop_nlink(new_dentry->d_inode);
 826                 /* Don't oops if the victim was a dirent pointing to an
 827                    inode which didn't exist. */
 828                 if (victim_f->inocache) {
 829                         mutex_lock(&victim_f->sem);
 830                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 831                                 victim_f->inocache->pino_nlink = 0;
 832                         else
 833                                 victim_f->inocache->pino_nlink--;
 834                         mutex_unlock(&victim_f->sem);
 835                 }
 836         }
 837
 838         /* If it was a directory we moved, and there was no victim,
 839            increase i_nlink on its new parent */
 840         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 841                 inc_nlink(new_dir_i);
 842
 843         /* Unlink the original */
 844         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 845                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 846
 847         /* We don't touch inode->i_nlink */
 848
 849         if (ret) {
 850                 /* Oh shit. We really ought to make a single node which can do both atomically */
 851                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 852                 mutex_lock(&f->sem);
 853                 inc_nlink(old_dentry->d_inode);
 854                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 855                         f->inocache->pino_nlink++;
 856                 mutex_unlock(&f->sem);
 857
 858                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 859                 /* Might as well let the VFS know */
 860                 d_instantiate(new_dentry, old_dentry->d_inode);
 861                 ihold(old_dentry->d_inode);
 862                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 863                 return ret;
 864         }
 865
 866         if (S_ISDIR(old_dentry->d_inode->i_mode))
 867                 drop_nlink(old_dir_i);
 868
 869         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 870
 871         return 0;
 872 }
 873