fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2001-2003 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  * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched.h>
  17 #include <linux/fs.h>
  18 #include <linux/crc32.h>
  19 #include <linux/jffs2.h>
  20 #include "jffs2_fs_i.h"
  21 #include "jffs2_fs_sb.h"
  22 #include <linux/time.h>
  23 #include "nodelist.h"
  24
  25 static int jffs2_readdir (struct file *, void *, filldir_t);
  26
  27 static int jffs2_create (struct inode *,struct dentry *,int,
  28                          struct nameidata *);
  29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  30                                     struct nameidata *);
  31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  32 static int jffs2_unlink (struct inode *,struct dentry *);
  33 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  34 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  35 static int jffs2_rmdir (struct inode *,struct dentry *);
  36 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
  37 static int jffs2_rename (struct inode *, struct dentry *,
  38                         struct inode *, struct dentry *);
  39
  40 const struct file_operations jffs2_dir_operations =
  41 {
  42         .read =         generic_read_dir,
  43         .readdir =      jffs2_readdir,
  44         .ioctl =        jffs2_ioctl,
  45         .fsync =        jffs2_fsync
  46 };
  47
  48
  49 struct inode_operations jffs2_dir_inode_operations =
  50 {
  51         .create =       jffs2_create,
  52         .lookup =       jffs2_lookup,
  53         .link =         jffs2_link,
  54         .unlink =       jffs2_unlink,
  55         .symlink =      jffs2_symlink,
  56         .mkdir =        jffs2_mkdir,
  57         .rmdir =        jffs2_rmdir,
  58         .mknod =        jffs2_mknod,
  59         .rename =       jffs2_rename,
  60         .setattr =      jffs2_setattr,
  61 };
  62
  63 /***********************************************************************/
  64
  65
  66 /* We keep the dirent list sorted in increasing order of name hash,
  67    and we use the same hash function as the dentries. Makes this
  68    nice and simple
  69 */
  70 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  71                                    struct nameidata *nd)
  72 {
  73         struct jffs2_inode_info *dir_f;
  74         struct jffs2_sb_info *c;
  75         struct jffs2_full_dirent *fd = NULL, *fd_list;
  76         uint32_t ino = 0;
  77         struct inode *inode = NULL;
  78
  79         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
  80
  81         if (target->d_name.len > JFFS2_MAX_NAME_LEN)
  82                 return ERR_PTR(-ENAMETOOLONG);
  83
  84         dir_f = JFFS2_INODE_INFO(dir_i);
  85         c = JFFS2_SB_INFO(dir_i->i_sb);
  86
  87         down(&dir_f->sem);
  88
  89         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  90         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  91                 if (fd_list->nhash == target->d_name.hash &&
  92                     (!fd || fd_list->version > fd->version) &&
  93                     strlen(fd_list->name) == target->d_name.len &&
  94                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  95                         fd = fd_list;
  96                 }
  97         }
  98         if (fd)
  99                 ino = fd->ino;
 100         up(&dir_f->sem);
 101         if (ino) {
 102                 inode = iget(dir_i->i_sb, ino);
 103                 if (!inode) {
 104                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 105                         return (ERR_PTR(-EIO));
 106                 }
 107         }
 108
 109         d_add(target, inode);
 110
 111         return NULL;
 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 jffs2_sb_info *c;
 121         struct inode *inode = filp->f_dentry->d_inode;
 122         struct jffs2_full_dirent *fd;
 123         unsigned long offset, curofs;
 124
 125         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
 126
 127         f = JFFS2_INODE_INFO(inode);
 128         c = JFFS2_SB_INFO(inode->i_sb);
 129
 130         offset = filp->f_pos;
 131
 132         if (offset == 0) {
 133                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 134                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 135                         goto out;
 136                 offset++;
 137         }
 138         if (offset == 1) {
 139                 unsigned long pino = parent_ino(filp->f_dentry);
 140                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 141                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 142                         goto out;
 143                 offset++;
 144         }
 145
 146         curofs=1;
 147         down(&f->sem);
 148         for (fd = f->dents; fd; fd = fd->next) {
 149
 150                 curofs++;
 151                 /* First loop: curofs = 2; offset = 2 */
 152                 if (curofs < offset) {
 153                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 154                                   fd->name, fd->ino, fd->type, curofs, offset));
 155                         continue;
 156                 }
 157                 if (!fd->ino) {
 158                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 159                         offset++;
 160                         continue;
 161                 }
 162                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 163                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 164                         break;
 165                 offset++;
 166         }
 167         up(&f->sem);
 168  out:
 169         filp->f_pos = offset;
 170         return 0;
 171 }
 172
 173 /***********************************************************************/
 174
 175
 176 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 177                         struct nameidata *nd)
 178 {
 179         struct jffs2_raw_inode *ri;
 180         struct jffs2_inode_info *f, *dir_f;
 181         struct jffs2_sb_info *c;
 182         struct inode *inode;
 183         int ret;
 184
 185         ri = jffs2_alloc_raw_inode();
 186         if (!ri)
 187                 return -ENOMEM;
 188
 189         c = JFFS2_SB_INFO(dir_i->i_sb);
 190
 191         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 192
 193         inode = jffs2_new_inode(dir_i, mode, ri);
 194
 195         if (IS_ERR(inode)) {
 196                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 197                 jffs2_free_raw_inode(ri);
 198                 return PTR_ERR(inode);
 199         }
 200
 201         inode->i_op = &jffs2_file_inode_operations;
 202         inode->i_fop = &jffs2_file_operations;
 203         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 204         inode->i_mapping->nrpages = 0;
 205
 206         f = JFFS2_INODE_INFO(inode);
 207         dir_f = JFFS2_INODE_INFO(dir_i);
 208
 209         ret = jffs2_do_create(c, dir_f, f, ri,
 210                               dentry->d_name.name, dentry->d_name.len);
 211
 212         if (ret) {
 213                 make_bad_inode(inode);
 214                 iput(inode);
 215                 jffs2_free_raw_inode(ri);
 216                 return ret;
 217         }
 218
 219         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 220
 221         jffs2_free_raw_inode(ri);
 222         d_instantiate(dentry, inode);
 223
 224         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 225                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 226         return 0;
 227 }
 228
 229 /***********************************************************************/
 230
 231
 232 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 233 {
 234         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 235         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 236         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 237         int ret;
 238         uint32_t now = get_seconds();
 239
 240         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 241                               dentry->d_name.len, dead_f, now);
 242         if (dead_f->inocache)
 243                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 244         if (!ret)
 245                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 246         return ret;
 247 }
 248 /***********************************************************************/
 249
 250
 251 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 252 {
 253         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 254         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 255         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 256         int ret;
 257         uint8_t type;
 258         uint32_t now;
 259
 260         /* Don't let people make hard links to bad inodes. */
 261         if (!f->inocache)
 262                 return -EIO;
 263
 264         if (S_ISDIR(old_dentry->d_inode->i_mode))
 265                 return -EPERM;
 266
 267         /* XXX: This is ugly */
 268         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 269         if (!type) type = DT_REG;
 270
 271         now = get_seconds();
 272         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 273
 274         if (!ret) {
 275                 down(&f->sem);
 276                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 277                 up(&f->sem);
 278                 d_instantiate(dentry, old_dentry->d_inode);
 279                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 280                 atomic_inc(&old_dentry->d_inode->i_count);
 281         }
 282         return ret;
 283 }
 284
 285 /***********************************************************************/
 286
 287 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 288 {
 289         struct jffs2_inode_info *f, *dir_f;
 290         struct jffs2_sb_info *c;
 291         struct inode *inode;
 292         struct jffs2_raw_inode *ri;
 293         struct jffs2_raw_dirent *rd;
 294         struct jffs2_full_dnode *fn;
 295         struct jffs2_full_dirent *fd;
 296         int namelen;
 297         uint32_t alloclen, phys_ofs;
 298         int ret, targetlen = strlen(target);
 299
 300         /* FIXME: If you care. We'd need to use frags for the target
 301            if it grows much more than this */
 302         if (targetlen > 254)
 303                 return -EINVAL;
 304
 305         ri = jffs2_alloc_raw_inode();
 306
 307         if (!ri)
 308                 return -ENOMEM;
 309
 310         c = JFFS2_SB_INFO(dir_i->i_sb);
 311
 312         /* Try to reserve enough space for both node and dirent.
 313          * Just the node will do for now, though
 314          */
 315         namelen = dentry->d_name.len;
 316         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen,
 317                                 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 318
 319         if (ret) {
 320                 jffs2_free_raw_inode(ri);
 321                 return ret;
 322         }
 323
 324         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 325
 326         if (IS_ERR(inode)) {
 327                 jffs2_free_raw_inode(ri);
 328                 jffs2_complete_reservation(c);
 329                 return PTR_ERR(inode);
 330         }
 331
 332         inode->i_op = &jffs2_symlink_inode_operations;
 333
 334         f = JFFS2_INODE_INFO(inode);
 335
 336         inode->i_size = targetlen;
 337         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 338         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 339         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 340
 341         ri->compr = JFFS2_COMPR_NONE;
 342         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 343         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 344
 345         fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
 346
 347         jffs2_free_raw_inode(ri);
 348
 349         if (IS_ERR(fn)) {
 350                 /* Eeek. Wave bye bye */
 351                 up(&f->sem);
 352                 jffs2_complete_reservation(c);
 353                 jffs2_clear_inode(inode);
 354                 return PTR_ERR(fn);
 355         }
 356
 357         /* We use f->target field to store the target path. */
 358         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 359         if (!f->target) {
 360                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 361                 up(&f->sem);
 362                 jffs2_complete_reservation(c);
 363                 jffs2_clear_inode(inode);
 364                 return -ENOMEM;
 365         }
 366
 367         memcpy(f->target, target, targetlen + 1);
 368         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 369
 370         /* No data here. Only a metadata node, which will be
 371            obsoleted by the first data write
 372         */
 373         f->metadata = fn;
 374         up(&f->sem);
 375
 376         jffs2_complete_reservation(c);
 377         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 378                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 379         if (ret) {
 380                 /* Eep. */
 381                 jffs2_clear_inode(inode);
 382                 return ret;
 383         }
 384
 385         rd = jffs2_alloc_raw_dirent();
 386         if (!rd) {
 387                 /* Argh. Now we treat it like a normal delete */
 388                 jffs2_complete_reservation(c);
 389                 jffs2_clear_inode(inode);
 390                 return -ENOMEM;
 391         }
 392
 393         dir_f = JFFS2_INODE_INFO(dir_i);
 394         down(&dir_f->sem);
 395
 396         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 397         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 398         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 399         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 400
 401         rd->pino = cpu_to_je32(dir_i->i_ino);
 402         rd->version = cpu_to_je32(++dir_f->highest_version);
 403         rd->ino = cpu_to_je32(inode->i_ino);
 404         rd->mctime = cpu_to_je32(get_seconds());
 405         rd->nsize = namelen;
 406         rd->type = DT_LNK;
 407         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 408         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 409
 410         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 411
 412         if (IS_ERR(fd)) {
 413                 /* dirent failed to write. Delete the inode normally
 414                    as if it were the final unlink() */
 415                 jffs2_complete_reservation(c);
 416                 jffs2_free_raw_dirent(rd);
 417                 up(&dir_f->sem);
 418                 jffs2_clear_inode(inode);
 419                 return PTR_ERR(fd);
 420         }
 421
 422         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 423
 424         jffs2_free_raw_dirent(rd);
 425
 426         /* Link the fd into the inode's list, obsoleting an old
 427            one if necessary. */
 428         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 429
 430         up(&dir_f->sem);
 431         jffs2_complete_reservation(c);
 432
 433         d_instantiate(dentry, inode);
 434         return 0;
 435 }
 436
 437
 438 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 439 {
 440         struct jffs2_inode_info *f, *dir_f;
 441         struct jffs2_sb_info *c;
 442         struct inode *inode;
 443         struct jffs2_raw_inode *ri;
 444         struct jffs2_raw_dirent *rd;
 445         struct jffs2_full_dnode *fn;
 446         struct jffs2_full_dirent *fd;
 447         int namelen;
 448         uint32_t alloclen, phys_ofs;
 449         int ret;
 450
 451         mode |= S_IFDIR;
 452
 453         ri = jffs2_alloc_raw_inode();
 454         if (!ri)
 455                 return -ENOMEM;
 456
 457         c = JFFS2_SB_INFO(dir_i->i_sb);
 458
 459         /* Try to reserve enough space for both node and dirent.
 460          * Just the node will do for now, though
 461          */
 462         namelen = dentry->d_name.len;
 463         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL,
 464                                 JFFS2_SUMMARY_INODE_SIZE);
 465
 466         if (ret) {
 467                 jffs2_free_raw_inode(ri);
 468                 return ret;
 469         }
 470
 471         inode = jffs2_new_inode(dir_i, mode, ri);
 472
 473         if (IS_ERR(inode)) {
 474                 jffs2_free_raw_inode(ri);
 475                 jffs2_complete_reservation(c);
 476                 return PTR_ERR(inode);
 477         }
 478
 479         inode->i_op = &jffs2_dir_inode_operations;
 480         inode->i_fop = &jffs2_dir_operations;
 481         /* Directories get nlink 2 at start */
 482         inode->i_nlink = 2;
 483
 484         f = JFFS2_INODE_INFO(inode);
 485
 486         ri->data_crc = cpu_to_je32(0);
 487         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 488
 489         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 490
 491         jffs2_free_raw_inode(ri);
 492
 493         if (IS_ERR(fn)) {
 494                 /* Eeek. Wave bye bye */
 495                 up(&f->sem);
 496                 jffs2_complete_reservation(c);
 497                 jffs2_clear_inode(inode);
 498                 return PTR_ERR(fn);
 499         }
 500         /* No data here. Only a metadata node, which will be
 501            obsoleted by the first data write
 502         */
 503         f->metadata = fn;
 504         up(&f->sem);
 505
 506         jffs2_complete_reservation(c);
 507         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 508                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 509         if (ret) {
 510                 /* Eep. */
 511                 jffs2_clear_inode(inode);
 512                 return ret;
 513         }
 514
 515         rd = jffs2_alloc_raw_dirent();
 516         if (!rd) {
 517                 /* Argh. Now we treat it like a normal delete */
 518                 jffs2_complete_reservation(c);
 519                 jffs2_clear_inode(inode);
 520                 return -ENOMEM;
 521         }
 522
 523         dir_f = JFFS2_INODE_INFO(dir_i);
 524         down(&dir_f->sem);
 525
 526         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 527         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 528         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 529         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 530
 531         rd->pino = cpu_to_je32(dir_i->i_ino);
 532         rd->version = cpu_to_je32(++dir_f->highest_version);
 533         rd->ino = cpu_to_je32(inode->i_ino);
 534         rd->mctime = cpu_to_je32(get_seconds());
 535         rd->nsize = namelen;
 536         rd->type = DT_DIR;
 537         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 538         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 539
 540         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 541
 542         if (IS_ERR(fd)) {
 543                 /* dirent failed to write. Delete the inode normally
 544                    as if it were the final unlink() */
 545                 jffs2_complete_reservation(c);
 546                 jffs2_free_raw_dirent(rd);
 547                 up(&dir_f->sem);
 548                 jffs2_clear_inode(inode);
 549                 return PTR_ERR(fd);
 550         }
 551
 552         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 553         dir_i->i_nlink++;
 554
 555         jffs2_free_raw_dirent(rd);
 556
 557         /* Link the fd into the inode's list, obsoleting an old
 558            one if necessary. */
 559         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 560
 561         up(&dir_f->sem);
 562         jffs2_complete_reservation(c);
 563
 564         d_instantiate(dentry, inode);
 565         return 0;
 566 }
 567
 568 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 569 {
 570         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 571         struct jffs2_full_dirent *fd;
 572         int ret;
 573
 574         for (fd = f->dents ; fd; fd = fd->next) {
 575                 if (fd->ino)
 576                         return -ENOTEMPTY;
 577         }
 578         ret = jffs2_unlink(dir_i, dentry);
 579         if (!ret)
 580                 dir_i->i_nlink--;
 581         return ret;
 582 }
 583
 584 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 585 {
 586         struct jffs2_inode_info *f, *dir_f;
 587         struct jffs2_sb_info *c;
 588         struct inode *inode;
 589         struct jffs2_raw_inode *ri;
 590         struct jffs2_raw_dirent *rd;
 591         struct jffs2_full_dnode *fn;
 592         struct jffs2_full_dirent *fd;
 593         int namelen;
 594         jint16_t dev;
 595         int devlen = 0;
 596         uint32_t alloclen, phys_ofs;
 597         int ret;
 598
 599         if (!old_valid_dev(rdev))
 600                 return -EINVAL;
 601
 602         ri = jffs2_alloc_raw_inode();
 603         if (!ri)
 604                 return -ENOMEM;
 605
 606         c = JFFS2_SB_INFO(dir_i->i_sb);
 607
 608         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 609                 dev = cpu_to_je16(old_encode_dev(rdev));
 610                 devlen = sizeof(dev);
 611         }
 612
 613         /* Try to reserve enough space for both node and dirent.
 614          * Just the node will do for now, though
 615          */
 616         namelen = dentry->d_name.len;
 617         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen,
 618                                 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 619
 620         if (ret) {
 621                 jffs2_free_raw_inode(ri);
 622                 return ret;
 623         }
 624
 625         inode = jffs2_new_inode(dir_i, mode, ri);
 626
 627         if (IS_ERR(inode)) {
 628                 jffs2_free_raw_inode(ri);
 629                 jffs2_complete_reservation(c);
 630                 return PTR_ERR(inode);
 631         }
 632         inode->i_op = &jffs2_file_inode_operations;
 633         init_special_inode(inode, inode->i_mode, rdev);
 634
 635         f = JFFS2_INODE_INFO(inode);
 636
 637         ri->dsize = ri->csize = cpu_to_je32(devlen);
 638         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 639         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 640
 641         ri->compr = JFFS2_COMPR_NONE;
 642         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 643         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 644
 645         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 646
 647         jffs2_free_raw_inode(ri);
 648
 649         if (IS_ERR(fn)) {
 650                 /* Eeek. Wave bye bye */
 651                 up(&f->sem);
 652                 jffs2_complete_reservation(c);
 653                 jffs2_clear_inode(inode);
 654                 return PTR_ERR(fn);
 655         }
 656         /* No data here. Only a metadata node, which will be
 657            obsoleted by the first data write
 658         */
 659         f->metadata = fn;
 660         up(&f->sem);
 661
 662         jffs2_complete_reservation(c);
 663         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 664                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 665         if (ret) {
 666                 /* Eep. */
 667                 jffs2_clear_inode(inode);
 668                 return ret;
 669         }
 670
 671         rd = jffs2_alloc_raw_dirent();
 672         if (!rd) {
 673                 /* Argh. Now we treat it like a normal delete */
 674                 jffs2_complete_reservation(c);
 675                 jffs2_clear_inode(inode);
 676                 return -ENOMEM;
 677         }
 678
 679         dir_f = JFFS2_INODE_INFO(dir_i);
 680         down(&dir_f->sem);
 681
 682         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 683         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 684         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 685         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 686
 687         rd->pino = cpu_to_je32(dir_i->i_ino);
 688         rd->version = cpu_to_je32(++dir_f->highest_version);
 689         rd->ino = cpu_to_je32(inode->i_ino);
 690         rd->mctime = cpu_to_je32(get_seconds());
 691         rd->nsize = namelen;
 692
 693         /* XXX: This is ugly. */
 694         rd->type = (mode & S_IFMT) >> 12;
 695
 696         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 697         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 698
 699         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 700
 701         if (IS_ERR(fd)) {
 702                 /* dirent failed to write. Delete the inode normally
 703                    as if it were the final unlink() */
 704                 jffs2_complete_reservation(c);
 705                 jffs2_free_raw_dirent(rd);
 706                 up(&dir_f->sem);
 707                 jffs2_clear_inode(inode);
 708                 return PTR_ERR(fd);
 709         }
 710
 711         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 712
 713         jffs2_free_raw_dirent(rd);
 714
 715         /* Link the fd into the inode's list, obsoleting an old
 716            one if necessary. */
 717         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 718
 719         up(&dir_f->sem);
 720         jffs2_complete_reservation(c);
 721
 722         d_instantiate(dentry, inode);
 723
 724         return 0;
 725 }
 726
 727 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 728                         struct inode *new_dir_i, struct dentry *new_dentry)
 729 {
 730         int ret;
 731         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 732         struct jffs2_inode_info *victim_f = NULL;
 733         uint8_t type;
 734         uint32_t now;
 735
 736         /* The VFS will check for us and prevent trying to rename a
 737          * file over a directory and vice versa, but if it's a directory,
 738          * the VFS can't check whether the victim is empty. The filesystem
 739          * needs to do that for itself.
 740          */
 741         if (new_dentry->d_inode) {
 742                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 743                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 744                         struct jffs2_full_dirent *fd;
 745
 746                         down(&victim_f->sem);
 747                         for (fd = victim_f->dents; fd; fd = fd->next) {
 748                                 if (fd->ino) {
 749                                         up(&victim_f->sem);
 750                                         return -ENOTEMPTY;
 751                                 }
 752                         }
 753                         up(&victim_f->sem);
 754                 }
 755         }
 756
 757         /* XXX: We probably ought to alloc enough space for
 758            both nodes at the same time. Writing the new link,
 759            then getting -ENOSPC, is quite bad :)
 760         */
 761
 762         /* Make a hard link */
 763
 764         /* XXX: This is ugly */
 765         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 766         if (!type) type = DT_REG;
 767
 768         now = get_seconds();
 769         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 770                             old_dentry->d_inode->i_ino, type,
 771                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 772
 773         if (ret)
 774                 return ret;
 775
 776         if (victim_f) {
 777                 /* There was a victim. Kill it off nicely */
 778                 new_dentry->d_inode->i_nlink--;
 779                 /* Don't oops if the victim was a dirent pointing to an
 780                    inode which didn't exist. */
 781                 if (victim_f->inocache) {
 782                         down(&victim_f->sem);
 783                         victim_f->inocache->nlink--;
 784                         up(&victim_f->sem);
 785                 }
 786         }
 787
 788         /* If it was a directory we moved, and there was no victim,
 789            increase i_nlink on its new parent */
 790         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 791                 new_dir_i->i_nlink++;
 792
 793         /* Unlink the original */
 794         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 795                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 796
 797         /* We don't touch inode->i_nlink */
 798
 799         if (ret) {
 800                 /* Oh shit. We really ought to make a single node which can do both atomically */
 801                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 802                 down(&f->sem);
 803                 old_dentry->d_inode->i_nlink++;
 804                 if (f->inocache)
 805                         f->inocache->nlink++;
 806                 up(&f->sem);
 807
 808                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 809                 /* Might as well let the VFS know */
 810                 d_instantiate(new_dentry, old_dentry->d_inode);
 811                 atomic_inc(&old_dentry->d_inode->i_count);
 812                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 813                 return ret;
 814         }
 815
 816         if (S_ISDIR(old_dentry->d_inode->i_mode))
 817                 old_dir_i->i_nlink--;
 818
 819         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 820
 821         return 0;
 822 }
 823