fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
   6  *
   7  * Created by David Woodhouse <dwmw2@infradead.org>
   8  *
   9  * For licensing information, see the file 'LICENCE' in this directory.
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/fs.h>
  16 #include <linux/crc32.h>
  17 #include <linux/jffs2.h>
  18 #include "jffs2_fs_i.h"
  19 #include "jffs2_fs_sb.h"
  20 #include <linux/time.h>
  21 #include "nodelist.h"
  22
  23 static int jffs2_readdir (struct file *, void *, filldir_t);
  24
  25 static int jffs2_create (struct inode *,struct dentry *,umode_t,
  26                          struct nameidata *);
  27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  28                                     struct nameidata *);
  29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  30 static int jffs2_unlink (struct inode *,struct dentry *);
  31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  32 static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
  33 static int jffs2_rmdir (struct inode *,struct dentry *);
  34 static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
  35 static int jffs2_rename (struct inode *, struct dentry *,
  36                          struct inode *, struct dentry *);
  37
  38 const struct file_operations jffs2_dir_operations =
  39 {
  40         .read =         generic_read_dir,
  41         .readdir =      jffs2_readdir,
  42         .unlocked_ioctl=jffs2_ioctl,
  43         .fsync =        jffs2_fsync,
  44         .llseek =       generic_file_llseek,
  45 };
  46
  47
  48 const struct inode_operations jffs2_dir_inode_operations =
  49 {
  50         .create =       jffs2_create,
  51         .lookup =       jffs2_lookup,
  52         .link =         jffs2_link,
  53         .unlink =       jffs2_unlink,
  54         .symlink =      jffs2_symlink,
  55         .mkdir =        jffs2_mkdir,
  56         .rmdir =        jffs2_rmdir,
  57         .mknod =        jffs2_mknod,
  58         .rename =       jffs2_rename,
  59         .get_acl =      jffs2_get_acl,
  60         .setattr =      jffs2_setattr,
  61         .setxattr =     jffs2_setxattr,
  62         .getxattr =     jffs2_getxattr,
  63         .listxattr =    jffs2_listxattr,
  64         .removexattr =  jffs2_removexattr
  65 };
  66
  67 /***********************************************************************/
  68
  69
  70 /* We keep the dirent list sorted in increasing order of name hash,
  71    and we use the same hash function as the dentries. Makes this
  72    nice and simple
  73 */
  74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  75                                    struct nameidata *nd)
  76 {
  77         struct jffs2_inode_info *dir_f;
  78         struct jffs2_full_dirent *fd = NULL, *fd_list;
  79         uint32_t ino = 0;
  80         struct inode *inode = NULL;
  81
  82         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         }
 108
 109         return d_splice_alias(inode, target);
 110 }
 111
 112 /***********************************************************************/
 113
 114
 115 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 116 {
 117         struct jffs2_inode_info *f;
 118         struct inode *inode = filp->f_path.dentry->d_inode;
 119         struct jffs2_full_dirent *fd;
 120         unsigned long offset, curofs;
 121
 122         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
 123
 124         f = JFFS2_INODE_INFO(inode);
 125
 126         offset = filp->f_pos;
 127
 128         if (offset == 0) {
 129                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 130                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 131                         goto out;
 132                 offset++;
 133         }
 134         if (offset == 1) {
 135                 unsigned long pino = parent_ino(filp->f_path.dentry);
 136                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 137                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 138                         goto out;
 139                 offset++;
 140         }
 141
 142         curofs=1;
 143         mutex_lock(&f->sem);
 144         for (fd = f->dents; fd; fd = fd->next) {
 145
 146                 curofs++;
 147                 /* First loop: curofs = 2; offset = 2 */
 148                 if (curofs < offset) {
 149                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 150                                   fd->name, fd->ino, fd->type, curofs, offset));
 151                         continue;
 152                 }
 153                 if (!fd->ino) {
 154                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 155                         offset++;
 156                         continue;
 157                 }
 158                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 159                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 160                         break;
 161                 offset++;
 162         }
 163         mutex_unlock(&f->sem);
 164  out:
 165         filp->f_pos = offset;
 166         return 0;
 167 }
 168
 169 /***********************************************************************/
 170
 171
 172 static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
 173                         umode_t mode, struct nameidata *nd)
 174 {
 175         struct jffs2_raw_inode *ri;
 176         struct jffs2_inode_info *f, *dir_f;
 177         struct jffs2_sb_info *c;
 178         struct inode *inode;
 179         int ret;
 180
 181         ri = jffs2_alloc_raw_inode();
 182         if (!ri)
 183                 return -ENOMEM;
 184
 185         c = JFFS2_SB_INFO(dir_i->i_sb);
 186
 187         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 188
 189         inode = jffs2_new_inode(dir_i, mode, ri);
 190
 191         if (IS_ERR(inode)) {
 192                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 193                 jffs2_free_raw_inode(ri);
 194                 return PTR_ERR(inode);
 195         }
 196
 197         inode->i_op = &jffs2_file_inode_operations;
 198         inode->i_fop = &jffs2_file_operations;
 199         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 200         inode->i_mapping->nrpages = 0;
 201
 202         f = JFFS2_INODE_INFO(inode);
 203         dir_f = JFFS2_INODE_INFO(dir_i);
 204
 205         /* jffs2_do_create() will want to lock it, _after_ reserving
 206            space and taking c-alloc_sem. If we keep it locked here,
 207            lockdep gets unhappy (although it's a false positive;
 208            nothing else will be looking at this inode yet so there's
 209            no chance of AB-BA deadlock involving its f->sem). */
 210         mutex_unlock(&f->sem);
 211
 212         ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
 213         if (ret)
 214                 goto fail;
 215
 216         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 217
 218         jffs2_free_raw_inode(ri);
 219
 220         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 221                   inode->i_ino, inode->i_mode, inode->i_nlink,
 222                   f->inocache->pino_nlink, inode->i_mapping->nrpages));
 223
 224         d_instantiate(dentry, inode);
 225         unlock_new_inode(inode);
 226         return 0;
 227
 228  fail:
 229         iget_failed(inode);
 230         jffs2_free_raw_inode(ri);
 231         return ret;
 232 }
 233
 234 /***********************************************************************/
 235
 236
 237 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 238 {
 239         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 240         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 241         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 242         int ret;
 243         uint32_t now = get_seconds();
 244
 245         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 246                               dentry->d_name.len, dead_f, now);
 247         if (dead_f->inocache)
 248                 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink);
 249         if (!ret)
 250                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 251         return ret;
 252 }
 253 /***********************************************************************/
 254
 255
 256 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 257 {
 258         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 259         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 260         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 261         int ret;
 262         uint8_t type;
 263         uint32_t now;
 264
 265         /* Don't let people make hard links to bad inodes. */
 266         if (!f->inocache)
 267                 return -EIO;
 268
 269         if (S_ISDIR(old_dentry->d_inode->i_mode))
 270                 return -EPERM;
 271
 272         /* XXX: This is ugly */
 273         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 274         if (!type) type = DT_REG;
 275
 276         now = get_seconds();
 277         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 278
 279         if (!ret) {
 280                 mutex_lock(&f->sem);
 281                 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink);
 282                 mutex_unlock(&f->sem);
 283                 d_instantiate(dentry, old_dentry->d_inode);
 284                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 285                 ihold(old_dentry->d_inode);
 286         }
 287         return ret;
 288 }
 289
 290 /***********************************************************************/
 291
 292 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 293 {
 294         struct jffs2_inode_info *f, *dir_f;
 295         struct jffs2_sb_info *c;
 296         struct inode *inode;
 297         struct jffs2_raw_inode *ri;
 298         struct jffs2_raw_dirent *rd;
 299         struct jffs2_full_dnode *fn;
 300         struct jffs2_full_dirent *fd;
 301         int namelen;
 302         uint32_t alloclen;
 303         int ret, targetlen = strlen(target);
 304
 305         /* FIXME: If you care. We'd need to use frags for the target
 306            if it grows much more than this */
 307         if (targetlen > 254)
 308                 return -ENAMETOOLONG;
 309
 310         ri = jffs2_alloc_raw_inode();
 311
 312         if (!ri)
 313                 return -ENOMEM;
 314
 315         c = JFFS2_SB_INFO(dir_i->i_sb);
 316
 317         /* Try to reserve enough space for both node and dirent.
 318          * Just the node will do for now, though
 319          */
 320         namelen = dentry->d_name.len;
 321         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 322                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 323
 324         if (ret) {
 325                 jffs2_free_raw_inode(ri);
 326                 return ret;
 327         }
 328
 329         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 330
 331         if (IS_ERR(inode)) {
 332                 jffs2_free_raw_inode(ri);
 333                 jffs2_complete_reservation(c);
 334                 return PTR_ERR(inode);
 335         }
 336
 337         inode->i_op = &jffs2_symlink_inode_operations;
 338
 339         f = JFFS2_INODE_INFO(inode);
 340
 341         inode->i_size = targetlen;
 342         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 343         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 344         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 345
 346         ri->compr = JFFS2_COMPR_NONE;
 347         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 348         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 349
 350         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 351
 352         jffs2_free_raw_inode(ri);
 353
 354         if (IS_ERR(fn)) {
 355                 /* Eeek. Wave bye bye */
 356                 mutex_unlock(&f->sem);
 357                 jffs2_complete_reservation(c);
 358                 ret = PTR_ERR(fn);
 359                 goto fail;
 360         }
 361
 362         /* We use f->target field to store the target path. */
 363         f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
 364         if (!f->target) {
 365                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 366                 mutex_unlock(&f->sem);
 367                 jffs2_complete_reservation(c);
 368                 ret = -ENOMEM;
 369                 goto fail;
 370         }
 371
 372         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 373
 374         /* No data here. Only a metadata node, which will be
 375            obsoleted by the first data write
 376         */
 377         f->metadata = fn;
 378         mutex_unlock(&f->sem);
 379
 380         jffs2_complete_reservation(c);
 381
 382         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 383         if (ret)
 384                 goto fail;
 385
 386         ret = jffs2_init_acl_post(inode);
 387         if (ret)
 388                 goto fail;
 389
 390         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 391                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 392         if (ret)
 393                 goto fail;
 394
 395         rd = jffs2_alloc_raw_dirent();
 396         if (!rd) {
 397                 /* Argh. Now we treat it like a normal delete */
 398                 jffs2_complete_reservation(c);
 399                 ret = -ENOMEM;
 400                 goto fail;
 401         }
 402
 403         dir_f = JFFS2_INODE_INFO(dir_i);
 404         mutex_lock(&dir_f->sem);
 405
 406         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 407         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 408         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 409         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 410
 411         rd->pino = cpu_to_je32(dir_i->i_ino);
 412         rd->version = cpu_to_je32(++dir_f->highest_version);
 413         rd->ino = cpu_to_je32(inode->i_ino);
 414         rd->mctime = cpu_to_je32(get_seconds());
 415         rd->nsize = namelen;
 416         rd->type = DT_LNK;
 417         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 418         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 419
 420         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 421
 422         if (IS_ERR(fd)) {
 423                 /* dirent failed to write. Delete the inode normally
 424                    as if it were the final unlink() */
 425                 jffs2_complete_reservation(c);
 426                 jffs2_free_raw_dirent(rd);
 427                 mutex_unlock(&dir_f->sem);
 428                 ret = PTR_ERR(fd);
 429                 goto fail;
 430         }
 431
 432         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 433
 434         jffs2_free_raw_dirent(rd);
 435
 436         /* Link the fd into the inode's list, obsoleting an old
 437            one if necessary. */
 438         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 439
 440         mutex_unlock(&dir_f->sem);
 441         jffs2_complete_reservation(c);
 442
 443         d_instantiate(dentry, inode);
 444         unlock_new_inode(inode);
 445         return 0;
 446
 447  fail:
 448         iget_failed(inode);
 449         return ret;
 450 }
 451
 452
 453 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
 454 {
 455         struct jffs2_inode_info *f, *dir_f;
 456         struct jffs2_sb_info *c;
 457         struct inode *inode;
 458         struct jffs2_raw_inode *ri;
 459         struct jffs2_raw_dirent *rd;
 460         struct jffs2_full_dnode *fn;
 461         struct jffs2_full_dirent *fd;
 462         int namelen;
 463         uint32_t alloclen;
 464         int ret;
 465
 466         mode |= S_IFDIR;
 467
 468         ri = jffs2_alloc_raw_inode();
 469         if (!ri)
 470                 return -ENOMEM;
 471
 472         c = JFFS2_SB_INFO(dir_i->i_sb);
 473
 474         /* Try to reserve enough space for both node and dirent.
 475          * Just the node will do for now, though
 476          */
 477         namelen = dentry->d_name.len;
 478         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 479                                   JFFS2_SUMMARY_INODE_SIZE);
 480
 481         if (ret) {
 482                 jffs2_free_raw_inode(ri);
 483                 return ret;
 484         }
 485
 486         inode = jffs2_new_inode(dir_i, mode, ri);
 487
 488         if (IS_ERR(inode)) {
 489                 jffs2_free_raw_inode(ri);
 490                 jffs2_complete_reservation(c);
 491                 return PTR_ERR(inode);
 492         }
 493
 494         inode->i_op = &jffs2_dir_inode_operations;
 495         inode->i_fop = &jffs2_dir_operations;
 496
 497         f = JFFS2_INODE_INFO(inode);
 498
 499         /* Directories get nlink 2 at start */
 500         set_nlink(inode, 2);
 501         /* but ic->pino_nlink is the parent ino# */
 502         f->inocache->pino_nlink = dir_i->i_ino;
 503
 504         ri->data_crc = cpu_to_je32(0);
 505         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 506
 507         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 508
 509         jffs2_free_raw_inode(ri);
 510
 511         if (IS_ERR(fn)) {
 512                 /* Eeek. Wave bye bye */
 513                 mutex_unlock(&f->sem);
 514                 jffs2_complete_reservation(c);
 515                 ret = PTR_ERR(fn);
 516                 goto fail;
 517         }
 518         /* No data here. Only a metadata node, which will be
 519            obsoleted by the first data write
 520         */
 521         f->metadata = fn;
 522         mutex_unlock(&f->sem);
 523
 524         jffs2_complete_reservation(c);
 525
 526         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 527         if (ret)
 528                 goto fail;
 529
 530         ret = jffs2_init_acl_post(inode);
 531         if (ret)
 532                 goto fail;
 533
 534         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 535                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 536         if (ret)
 537                 goto fail;
 538
 539         rd = jffs2_alloc_raw_dirent();
 540         if (!rd) {
 541                 /* Argh. Now we treat it like a normal delete */
 542                 jffs2_complete_reservation(c);
 543                 ret = -ENOMEM;
 544                 goto fail;
 545         }
 546
 547         dir_f = JFFS2_INODE_INFO(dir_i);
 548         mutex_lock(&dir_f->sem);
 549
 550         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 551         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 552         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 553         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 554
 555         rd->pino = cpu_to_je32(dir_i->i_ino);
 556         rd->version = cpu_to_je32(++dir_f->highest_version);
 557         rd->ino = cpu_to_je32(inode->i_ino);
 558         rd->mctime = cpu_to_je32(get_seconds());
 559         rd->nsize = namelen;
 560         rd->type = DT_DIR;
 561         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 562         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 563
 564         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 565
 566         if (IS_ERR(fd)) {
 567                 /* dirent failed to write. Delete the inode normally
 568                    as if it were the final unlink() */
 569                 jffs2_complete_reservation(c);
 570                 jffs2_free_raw_dirent(rd);
 571                 mutex_unlock(&dir_f->sem);
 572                 ret = PTR_ERR(fd);
 573                 goto fail;
 574         }
 575
 576         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 577         inc_nlink(dir_i);
 578
 579         jffs2_free_raw_dirent(rd);
 580
 581         /* Link the fd into the inode's list, obsoleting an old
 582            one if necessary. */
 583         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 584
 585         mutex_unlock(&dir_f->sem);
 586         jffs2_complete_reservation(c);
 587
 588         d_instantiate(dentry, inode);
 589         unlock_new_inode(inode);
 590         return 0;
 591
 592  fail:
 593         iget_failed(inode);
 594         return ret;
 595 }
 596
 597 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 598 {
 599         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 600         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 601         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 602         struct jffs2_full_dirent *fd;
 603         int ret;
 604         uint32_t now = get_seconds();
 605
 606         for (fd = f->dents ; fd; fd = fd->next) {
 607                 if (fd->ino)
 608                         return -ENOTEMPTY;
 609         }
 610
 611         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 612                               dentry->d_name.len, f, now);
 613         if (!ret) {
 614                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 615                 clear_nlink(dentry->d_inode);
 616                 drop_nlink(dir_i);
 617         }
 618         return ret;
 619 }
 620
 621 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
 622 {
 623         struct jffs2_inode_info *f, *dir_f;
 624         struct jffs2_sb_info *c;
 625         struct inode *inode;
 626         struct jffs2_raw_inode *ri;
 627         struct jffs2_raw_dirent *rd;
 628         struct jffs2_full_dnode *fn;
 629         struct jffs2_full_dirent *fd;
 630         int namelen;
 631         union jffs2_device_node dev;
 632         int devlen = 0;
 633         uint32_t alloclen;
 634         int ret;
 635
 636         if (!new_valid_dev(rdev))
 637                 return -EINVAL;
 638
 639         ri = jffs2_alloc_raw_inode();
 640         if (!ri)
 641                 return -ENOMEM;
 642
 643         c = JFFS2_SB_INFO(dir_i->i_sb);
 644
 645         if (S_ISBLK(mode) || S_ISCHR(mode))
 646                 devlen = jffs2_encode_dev(&dev, rdev);
 647
 648         /* Try to reserve enough space for both node and dirent.
 649          * Just the node will do for now, though
 650          */
 651         namelen = dentry->d_name.len;
 652         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 653                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 654
 655         if (ret) {
 656                 jffs2_free_raw_inode(ri);
 657                 return ret;
 658         }
 659
 660         inode = jffs2_new_inode(dir_i, mode, ri);
 661
 662         if (IS_ERR(inode)) {
 663                 jffs2_free_raw_inode(ri);
 664                 jffs2_complete_reservation(c);
 665                 return PTR_ERR(inode);
 666         }
 667         inode->i_op = &jffs2_file_inode_operations;
 668         init_special_inode(inode, inode->i_mode, rdev);
 669
 670         f = JFFS2_INODE_INFO(inode);
 671
 672         ri->dsize = ri->csize = cpu_to_je32(devlen);
 673         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 674         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 675
 676         ri->compr = JFFS2_COMPR_NONE;
 677         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 678         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 679
 680         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 681
 682         jffs2_free_raw_inode(ri);
 683
 684         if (IS_ERR(fn)) {
 685                 /* Eeek. Wave bye bye */
 686                 mutex_unlock(&f->sem);
 687                 jffs2_complete_reservation(c);
 688                 ret = PTR_ERR(fn);
 689                 goto fail;
 690         }
 691         /* No data here. Only a metadata node, which will be
 692            obsoleted by the first data write
 693         */
 694         f->metadata = fn;
 695         mutex_unlock(&f->sem);
 696
 697         jffs2_complete_reservation(c);
 698
 699         ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
 700         if (ret)
 701                 goto fail;
 702
 703         ret = jffs2_init_acl_post(inode);
 704         if (ret)
 705                 goto fail;
 706
 707         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 708                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 709         if (ret)
 710                 goto fail;
 711
 712         rd = jffs2_alloc_raw_dirent();
 713         if (!rd) {
 714                 /* Argh. Now we treat it like a normal delete */
 715                 jffs2_complete_reservation(c);
 716                 ret = -ENOMEM;
 717                 goto fail;
 718         }
 719
 720         dir_f = JFFS2_INODE_INFO(dir_i);
 721         mutex_lock(&dir_f->sem);
 722
 723         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 724         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 725         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 726         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 727
 728         rd->pino = cpu_to_je32(dir_i->i_ino);
 729         rd->version = cpu_to_je32(++dir_f->highest_version);
 730         rd->ino = cpu_to_je32(inode->i_ino);
 731         rd->mctime = cpu_to_je32(get_seconds());
 732         rd->nsize = namelen;
 733
 734         /* XXX: This is ugly. */
 735         rd->type = (mode & S_IFMT) >> 12;
 736
 737         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 738         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 739
 740         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 741
 742         if (IS_ERR(fd)) {
 743                 /* dirent failed to write. Delete the inode normally
 744                    as if it were the final unlink() */
 745                 jffs2_complete_reservation(c);
 746                 jffs2_free_raw_dirent(rd);
 747                 mutex_unlock(&dir_f->sem);
 748                 ret = PTR_ERR(fd);
 749                 goto fail;
 750         }
 751
 752         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 753
 754         jffs2_free_raw_dirent(rd);
 755
 756         /* Link the fd into the inode's list, obsoleting an old
 757            one if necessary. */
 758         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 759
 760         mutex_unlock(&dir_f->sem);
 761         jffs2_complete_reservation(c);
 762
 763         d_instantiate(dentry, inode);
 764         unlock_new_inode(inode);
 765         return 0;
 766
 767  fail:
 768         iget_failed(inode);
 769         return ret;
 770 }
 771
 772 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 773                          struct inode *new_dir_i, struct dentry *new_dentry)
 774 {
 775         int ret;
 776         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 777         struct jffs2_inode_info *victim_f = NULL;
 778         uint8_t type;
 779         uint32_t now;
 780
 781         /* The VFS will check for us and prevent trying to rename a
 782          * file over a directory and vice versa, but if it's a directory,
 783          * the VFS can't check whether the victim is empty. The filesystem
 784          * needs to do that for itself.
 785          */
 786         if (new_dentry->d_inode) {
 787                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 788                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 789                         struct jffs2_full_dirent *fd;
 790
 791                         mutex_lock(&victim_f->sem);
 792                         for (fd = victim_f->dents; fd; fd = fd->next) {
 793                                 if (fd->ino) {
 794                                         mutex_unlock(&victim_f->sem);
 795                                         return -ENOTEMPTY;
 796                                 }
 797                         }
 798                         mutex_unlock(&victim_f->sem);
 799                 }
 800         }
 801
 802         /* XXX: We probably ought to alloc enough space for
 803            both nodes at the same time. Writing the new link,
 804            then getting -ENOSPC, is quite bad :)
 805         */
 806
 807         /* Make a hard link */
 808
 809         /* XXX: This is ugly */
 810         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 811         if (!type) type = DT_REG;
 812
 813         now = get_seconds();
 814         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 815                             old_dentry->d_inode->i_ino, type,
 816                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 817
 818         if (ret)
 819                 return ret;
 820
 821         if (victim_f) {
 822                 /* There was a victim. Kill it off nicely */
 823                 if (S_ISDIR(new_dentry->d_inode->i_mode))
 824                         clear_nlink(new_dentry->d_inode);
 825                 else
 826                         drop_nlink(new_dentry->d_inode);
 827                 /* Don't oops if the victim was a dirent pointing to an
 828                    inode which didn't exist. */
 829                 if (victim_f->inocache) {
 830                         mutex_lock(&victim_f->sem);
 831                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 832                                 victim_f->inocache->pino_nlink = 0;
 833                         else
 834                                 victim_f->inocache->pino_nlink--;
 835                         mutex_unlock(&victim_f->sem);
 836                 }
 837         }
 838
 839         /* If it was a directory we moved, and there was no victim,
 840            increase i_nlink on its new parent */
 841         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 842                 inc_nlink(new_dir_i);
 843
 844         /* Unlink the original */
 845         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 846                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 847
 848         /* We don't touch inode->i_nlink */
 849
 850         if (ret) {
 851                 /* Oh shit. We really ought to make a single node which can do both atomically */
 852                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 853                 mutex_lock(&f->sem);
 854                 inc_nlink(old_dentry->d_inode);
 855                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 856                         f->inocache->pino_nlink++;
 857                 mutex_unlock(&f->sem);
 858
 859                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 860                 /* Might as well let the VFS know */
 861                 d_instantiate(new_dentry, old_dentry->d_inode);
 862                 ihold(old_dentry->d_inode);
 863                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 864                 return ret;
 865         }
 866
 867         if (S_ISDIR(old_dentry->d_inode->i_mode))
 868                 drop_nlink(old_dir_i);
 869
 870         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 871
 872         return 0;
 873 }
 874