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 1.85 2005/03/01 10:34:03 dedekind 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 <linux/jffs2_fs_i.h>
  21 #include <linux/jffs2_fs_sb.h>
  22 #include <linux/time.h>
  23 #include "nodelist.h"
  24
  25 /* Urgh. Please tell me there's a nicer way of doing these. */
  26 #include <linux/version.h>
  27 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,48)
  28 typedef int mknod_arg_t;
  29 #define NAMEI_COMPAT(x) ((void *)x)
  30 #else
  31 typedef dev_t mknod_arg_t;
  32 #define NAMEI_COMPAT(x) (x)
  33 #endif
  34
  35 static int jffs2_readdir (struct file *, void *, filldir_t);
  36
  37 static int jffs2_create (struct inode *,struct dentry *,int,
  38                          struct nameidata *);
  39 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  40                                     struct nameidata *);
  41 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  42 static int jffs2_unlink (struct inode *,struct dentry *);
  43 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  44 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  45 static int jffs2_rmdir (struct inode *,struct dentry *);
  46 static int jffs2_mknod (struct inode *,struct dentry *,int,mknod_arg_t);
  47 static int jffs2_rename (struct inode *, struct dentry *,
  48                         struct inode *, struct dentry *);
  49
  50 struct file_operations jffs2_dir_operations =
  51 {
  52         .read =         generic_read_dir,
  53         .readdir =      jffs2_readdir,
  54         .ioctl =        jffs2_ioctl,
  55         .fsync =        jffs2_fsync
  56 };
  57
  58
  59 struct inode_operations jffs2_dir_inode_operations =
  60 {
  61         .create =       NAMEI_COMPAT(jffs2_create),
  62         .lookup =       NAMEI_COMPAT(jffs2_lookup),
  63         .link =         jffs2_link,
  64         .unlink =       jffs2_unlink,
  65         .symlink =      jffs2_symlink,
  66         .mkdir =        jffs2_mkdir,
  67         .rmdir =        jffs2_rmdir,
  68         .mknod =        jffs2_mknod,
  69         .rename =       jffs2_rename,
  70         .setattr =      jffs2_setattr,
  71 };
  72
  73 /***********************************************************************/
  74
  75
  76 /* We keep the dirent list sorted in increasing order of name hash,
  77    and we use the same hash function as the dentries. Makes this
  78    nice and simple
  79 */
  80 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  81                                    struct nameidata *nd)
  82 {
  83         struct jffs2_inode_info *dir_f;
  84         struct jffs2_sb_info *c;
  85         struct jffs2_full_dirent *fd = NULL, *fd_list;
  86         uint32_t ino = 0;
  87         struct inode *inode = NULL;
  88
  89         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
  90
  91         dir_f = JFFS2_INODE_INFO(dir_i);
  92         c = JFFS2_SB_INFO(dir_i->i_sb);
  93
  94         down(&dir_f->sem);
  95
  96         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  97         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  98                 if (fd_list->nhash == target->d_name.hash &&
  99                     (!fd || fd_list->version > fd->version) &&
 100                     strlen(fd_list->name) == target->d_name.len &&
 101                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
 102                         fd = fd_list;
 103                 }
 104         }
 105         if (fd)
 106                 ino = fd->ino;
 107         up(&dir_f->sem);
 108         if (ino) {
 109                 inode = iget(dir_i->i_sb, ino);
 110                 if (!inode) {
 111                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 112                         return (ERR_PTR(-EIO));
 113                 }
 114         }
 115
 116         d_add(target, inode);
 117
 118         return NULL;
 119 }
 120
 121 /***********************************************************************/
 122
 123
 124 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 125 {
 126         struct jffs2_inode_info *f;
 127         struct jffs2_sb_info *c;
 128         struct inode *inode = filp->f_dentry->d_inode;
 129         struct jffs2_full_dirent *fd;
 130         unsigned long offset, curofs;
 131
 132         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
 133
 134         f = JFFS2_INODE_INFO(inode);
 135         c = JFFS2_SB_INFO(inode->i_sb);
 136
 137         offset = filp->f_pos;
 138
 139         if (offset == 0) {
 140                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 141                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 142                         goto out;
 143                 offset++;
 144         }
 145         if (offset == 1) {
 146                 unsigned long pino = parent_ino(filp->f_dentry);
 147                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 148                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 149                         goto out;
 150                 offset++;
 151         }
 152
 153         curofs=1;
 154         down(&f->sem);
 155         for (fd = f->dents; fd; fd = fd->next) {
 156
 157                 curofs++;
 158                 /* First loop: curofs = 2; offset = 2 */
 159                 if (curofs < offset) {
 160                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 161                                   fd->name, fd->ino, fd->type, curofs, offset));
 162                         continue;
 163                 }
 164                 if (!fd->ino) {
 165                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 166                         offset++;
 167                         continue;
 168                 }
 169                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 170                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 171                         break;
 172                 offset++;
 173         }
 174         up(&f->sem);
 175  out:
 176         filp->f_pos = offset;
 177         return 0;
 178 }
 179
 180 /***********************************************************************/
 181
 182
 183 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 184                         struct nameidata *nd)
 185 {
 186         struct jffs2_raw_inode *ri;
 187         struct jffs2_inode_info *f, *dir_f;
 188         struct jffs2_sb_info *c;
 189         struct inode *inode;
 190         int ret;
 191
 192         ri = jffs2_alloc_raw_inode();
 193         if (!ri)
 194                 return -ENOMEM;
 195
 196         c = JFFS2_SB_INFO(dir_i->i_sb);
 197
 198         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 199
 200         inode = jffs2_new_inode(dir_i, mode, ri);
 201
 202         if (IS_ERR(inode)) {
 203                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 204                 jffs2_free_raw_inode(ri);
 205                 return PTR_ERR(inode);
 206         }
 207
 208         inode->i_op = &jffs2_file_inode_operations;
 209         inode->i_fop = &jffs2_file_operations;
 210         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 211         inode->i_mapping->nrpages = 0;
 212
 213         f = JFFS2_INODE_INFO(inode);
 214         dir_f = JFFS2_INODE_INFO(dir_i);
 215
 216         ret = jffs2_do_create(c, dir_f, f, ri,
 217                               dentry->d_name.name, dentry->d_name.len);
 218
 219         if (ret) {
 220                 make_bad_inode(inode);
 221                 iput(inode);
 222                 jffs2_free_raw_inode(ri);
 223                 return ret;
 224         }
 225
 226         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 227
 228         jffs2_free_raw_inode(ri);
 229         d_instantiate(dentry, inode);
 230
 231         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 232                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 233         return 0;
 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
 246         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 247                                dentry->d_name.len, dead_f);
 248         if (dead_f->inocache)
 249                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 250         return ret;
 251 }
 252 /***********************************************************************/
 253
 254
 255 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 256 {
 257         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 258         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 259         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 260         int ret;
 261         uint8_t type;
 262
 263         /* Don't let people make hard links to bad inodes. */
 264         if (!f->inocache)
 265                 return -EIO;
 266
 267         if (S_ISDIR(old_dentry->d_inode->i_mode))
 268                 return -EPERM;
 269
 270         /* XXX: This is ugly */
 271         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 272         if (!type) type = DT_REG;
 273
 274         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
 275
 276         if (!ret) {
 277                 down(&f->sem);
 278                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 279                 up(&f->sem);
 280                 d_instantiate(dentry, old_dentry->d_inode);
 281                 atomic_inc(&old_dentry->d_inode->i_count);
 282         }
 283         return ret;
 284 }
 285
 286 /***********************************************************************/
 287
 288 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 289 {
 290         struct jffs2_inode_info *f, *dir_f;
 291         struct jffs2_sb_info *c;
 292         struct inode *inode;
 293         struct jffs2_raw_inode *ri;
 294         struct jffs2_raw_dirent *rd;
 295         struct jffs2_full_dnode *fn;
 296         struct jffs2_full_dirent *fd;
 297         int namelen;
 298         uint32_t alloclen, phys_ofs;
 299         int ret, targetlen = strlen(target);
 300
 301         /* FIXME: If you care. We'd need to use frags for the target
 302            if it grows much more than this */
 303         if (targetlen > 254)
 304                 return -EINVAL;
 305
 306         ri = jffs2_alloc_raw_inode();
 307
 308         if (!ri)
 309                 return -ENOMEM;
 310
 311         c = JFFS2_SB_INFO(dir_i->i_sb);
 312
 313         /* Try to reserve enough space for both node and dirent.
 314          * Just the node will do for now, though
 315          */
 316         namelen = dentry->d_name.len;
 317         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 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->dents field to store the target path. */
 358         f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
 359         if (!f->dents) {
 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->dents, target, targetlen + 1);
 368         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));
 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, ALLOC_NORMAL);
 378         if (ret) {
 379                 /* Eep. */
 380                 jffs2_clear_inode(inode);
 381                 return ret;
 382         }
 383
 384         rd = jffs2_alloc_raw_dirent();
 385         if (!rd) {
 386                 /* Argh. Now we treat it like a normal delete */
 387                 jffs2_complete_reservation(c);
 388                 jffs2_clear_inode(inode);
 389                 return -ENOMEM;
 390         }
 391
 392         dir_f = JFFS2_INODE_INFO(dir_i);
 393         down(&dir_f->sem);
 394
 395         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 396         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 397         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 398         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 399
 400         rd->pino = cpu_to_je32(dir_i->i_ino);
 401         rd->version = cpu_to_je32(++dir_f->highest_version);
 402         rd->ino = cpu_to_je32(inode->i_ino);
 403         rd->mctime = cpu_to_je32(get_seconds());
 404         rd->nsize = namelen;
 405         rd->type = DT_LNK;
 406         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 407         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 408
 409         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 410
 411         if (IS_ERR(fd)) {
 412                 /* dirent failed to write. Delete the inode normally
 413                    as if it were the final unlink() */
 414                 jffs2_complete_reservation(c);
 415                 jffs2_free_raw_dirent(rd);
 416                 up(&dir_f->sem);
 417                 jffs2_clear_inode(inode);
 418                 return PTR_ERR(fd);
 419         }
 420
 421         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 422
 423         jffs2_free_raw_dirent(rd);
 424
 425         /* Link the fd into the inode's list, obsoleting an old
 426            one if necessary. */
 427         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 428
 429         up(&dir_f->sem);
 430         jffs2_complete_reservation(c);
 431
 432         d_instantiate(dentry, inode);
 433         return 0;
 434 }
 435
 436
 437 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 438 {
 439         struct jffs2_inode_info *f, *dir_f;
 440         struct jffs2_sb_info *c;
 441         struct inode *inode;
 442         struct jffs2_raw_inode *ri;
 443         struct jffs2_raw_dirent *rd;
 444         struct jffs2_full_dnode *fn;
 445         struct jffs2_full_dirent *fd;
 446         int namelen;
 447         uint32_t alloclen, phys_ofs;
 448         int ret;
 449
 450         mode |= S_IFDIR;
 451
 452         ri = jffs2_alloc_raw_inode();
 453         if (!ri)
 454                 return -ENOMEM;
 455
 456         c = JFFS2_SB_INFO(dir_i->i_sb);
 457
 458         /* Try to reserve enough space for both node and dirent.
 459          * Just the node will do for now, though
 460          */
 461         namelen = dentry->d_name.len;
 462         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 463
 464         if (ret) {
 465                 jffs2_free_raw_inode(ri);
 466                 return ret;
 467         }
 468
 469         inode = jffs2_new_inode(dir_i, mode, ri);
 470
 471         if (IS_ERR(inode)) {
 472                 jffs2_free_raw_inode(ri);
 473                 jffs2_complete_reservation(c);
 474                 return PTR_ERR(inode);
 475         }
 476
 477         inode->i_op = &jffs2_dir_inode_operations;
 478         inode->i_fop = &jffs2_dir_operations;
 479         /* Directories get nlink 2 at start */
 480         inode->i_nlink = 2;
 481
 482         f = JFFS2_INODE_INFO(inode);
 483
 484         ri->data_crc = cpu_to_je32(0);
 485         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 486
 487         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 488
 489         jffs2_free_raw_inode(ri);
 490
 491         if (IS_ERR(fn)) {
 492                 /* Eeek. Wave bye bye */
 493                 up(&f->sem);
 494                 jffs2_complete_reservation(c);
 495                 jffs2_clear_inode(inode);
 496                 return PTR_ERR(fn);
 497         }
 498         /* No data here. Only a metadata node, which will be
 499            obsoleted by the first data write
 500         */
 501         f->metadata = fn;
 502         up(&f->sem);
 503
 504         jffs2_complete_reservation(c);
 505         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 506         if (ret) {
 507                 /* Eep. */
 508                 jffs2_clear_inode(inode);
 509                 return ret;
 510         }
 511
 512         rd = jffs2_alloc_raw_dirent();
 513         if (!rd) {
 514                 /* Argh. Now we treat it like a normal delete */
 515                 jffs2_complete_reservation(c);
 516                 jffs2_clear_inode(inode);
 517                 return -ENOMEM;
 518         }
 519
 520         dir_f = JFFS2_INODE_INFO(dir_i);
 521         down(&dir_f->sem);
 522
 523         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 524         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 525         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 526         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 527
 528         rd->pino = cpu_to_je32(dir_i->i_ino);
 529         rd->version = cpu_to_je32(++dir_f->highest_version);
 530         rd->ino = cpu_to_je32(inode->i_ino);
 531         rd->mctime = cpu_to_je32(get_seconds());
 532         rd->nsize = namelen;
 533         rd->type = DT_DIR;
 534         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 535         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 536
 537         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 538
 539         if (IS_ERR(fd)) {
 540                 /* dirent failed to write. Delete the inode normally
 541                    as if it were the final unlink() */
 542                 jffs2_complete_reservation(c);
 543                 jffs2_free_raw_dirent(rd);
 544                 up(&dir_f->sem);
 545                 jffs2_clear_inode(inode);
 546                 return PTR_ERR(fd);
 547         }
 548
 549         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 550         dir_i->i_nlink++;
 551
 552         jffs2_free_raw_dirent(rd);
 553
 554         /* Link the fd into the inode's list, obsoleting an old
 555            one if necessary. */
 556         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 557
 558         up(&dir_f->sem);
 559         jffs2_complete_reservation(c);
 560
 561         d_instantiate(dentry, inode);
 562         return 0;
 563 }
 564
 565 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 566 {
 567         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 568         struct jffs2_full_dirent *fd;
 569         int ret;
 570
 571         for (fd = f->dents ; fd; fd = fd->next) {
 572                 if (fd->ino)
 573                         return -ENOTEMPTY;
 574         }
 575         ret = jffs2_unlink(dir_i, dentry);
 576         if (!ret)
 577                 dir_i->i_nlink--;
 578         return ret;
 579 }
 580
 581 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev)
 582 {
 583         struct jffs2_inode_info *f, *dir_f;
 584         struct jffs2_sb_info *c;
 585         struct inode *inode;
 586         struct jffs2_raw_inode *ri;
 587         struct jffs2_raw_dirent *rd;
 588         struct jffs2_full_dnode *fn;
 589         struct jffs2_full_dirent *fd;
 590         int namelen;
 591         jint16_t dev;
 592         int devlen = 0;
 593         uint32_t alloclen, phys_ofs;
 594         int ret;
 595
 596         if (!old_valid_dev(rdev))
 597                 return -EINVAL;
 598
 599         ri = jffs2_alloc_raw_inode();
 600         if (!ri)
 601                 return -ENOMEM;
 602
 603         c = JFFS2_SB_INFO(dir_i->i_sb);
 604
 605         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 606                 dev = cpu_to_je16(old_encode_dev(rdev));
 607                 devlen = sizeof(dev);
 608         }
 609
 610         /* Try to reserve enough space for both node and dirent.
 611          * Just the node will do for now, though
 612          */
 613         namelen = dentry->d_name.len;
 614         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 615
 616         if (ret) {
 617                 jffs2_free_raw_inode(ri);
 618                 return ret;
 619         }
 620
 621         inode = jffs2_new_inode(dir_i, mode, ri);
 622
 623         if (IS_ERR(inode)) {
 624                 jffs2_free_raw_inode(ri);
 625                 jffs2_complete_reservation(c);
 626                 return PTR_ERR(inode);
 627         }
 628         inode->i_op = &jffs2_file_inode_operations;
 629         init_special_inode(inode, inode->i_mode, rdev);
 630
 631         f = JFFS2_INODE_INFO(inode);
 632
 633         ri->dsize = ri->csize = cpu_to_je32(devlen);
 634         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 635         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 636
 637         ri->compr = JFFS2_COMPR_NONE;
 638         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 639         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 640
 641         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 642
 643         jffs2_free_raw_inode(ri);
 644
 645         if (IS_ERR(fn)) {
 646                 /* Eeek. Wave bye bye */
 647                 up(&f->sem);
 648                 jffs2_complete_reservation(c);
 649                 jffs2_clear_inode(inode);
 650                 return PTR_ERR(fn);
 651         }
 652         /* No data here. Only a metadata node, which will be
 653            obsoleted by the first data write
 654         */
 655         f->metadata = fn;
 656         up(&f->sem);
 657
 658         jffs2_complete_reservation(c);
 659         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 660         if (ret) {
 661                 /* Eep. */
 662                 jffs2_clear_inode(inode);
 663                 return ret;
 664         }
 665
 666         rd = jffs2_alloc_raw_dirent();
 667         if (!rd) {
 668                 /* Argh. Now we treat it like a normal delete */
 669                 jffs2_complete_reservation(c);
 670                 jffs2_clear_inode(inode);
 671                 return -ENOMEM;
 672         }
 673
 674         dir_f = JFFS2_INODE_INFO(dir_i);
 675         down(&dir_f->sem);
 676
 677         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 678         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 679         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 680         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 681
 682         rd->pino = cpu_to_je32(dir_i->i_ino);
 683         rd->version = cpu_to_je32(++dir_f->highest_version);
 684         rd->ino = cpu_to_je32(inode->i_ino);
 685         rd->mctime = cpu_to_je32(get_seconds());
 686         rd->nsize = namelen;
 687
 688         /* XXX: This is ugly. */
 689         rd->type = (mode & S_IFMT) >> 12;
 690
 691         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 692         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 693
 694         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 695
 696         if (IS_ERR(fd)) {
 697                 /* dirent failed to write. Delete the inode normally
 698                    as if it were the final unlink() */
 699                 jffs2_complete_reservation(c);
 700                 jffs2_free_raw_dirent(rd);
 701                 up(&dir_f->sem);
 702                 jffs2_clear_inode(inode);
 703                 return PTR_ERR(fd);
 704         }
 705
 706         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 707
 708         jffs2_free_raw_dirent(rd);
 709
 710         /* Link the fd into the inode's list, obsoleting an old
 711            one if necessary. */
 712         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 713
 714         up(&dir_f->sem);
 715         jffs2_complete_reservation(c);
 716
 717         d_instantiate(dentry, inode);
 718
 719         return 0;
 720 }
 721
 722 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 723                         struct inode *new_dir_i, struct dentry *new_dentry)
 724 {
 725         int ret;
 726         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 727         struct jffs2_inode_info *victim_f = NULL;
 728         uint8_t type;
 729
 730         /* The VFS will check for us and prevent trying to rename a
 731          * file over a directory and vice versa, but if it's a directory,
 732          * the VFS can't check whether the victim is empty. The filesystem
 733          * needs to do that for itself.
 734          */
 735         if (new_dentry->d_inode) {
 736                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 737                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 738                         struct jffs2_full_dirent *fd;
 739
 740                         down(&victim_f->sem);
 741                         for (fd = victim_f->dents; fd; fd = fd->next) {
 742                                 if (fd->ino) {
 743                                         up(&victim_f->sem);
 744                                         return -ENOTEMPTY;
 745                                 }
 746                         }
 747                         up(&victim_f->sem);
 748                 }
 749         }
 750
 751         /* XXX: We probably ought to alloc enough space for
 752            both nodes at the same time. Writing the new link,
 753            then getting -ENOSPC, is quite bad :)
 754         */
 755
 756         /* Make a hard link */
 757
 758         /* XXX: This is ugly */
 759         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 760         if (!type) type = DT_REG;
 761
 762         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 763                             old_dentry->d_inode->i_ino, type,
 764                             new_dentry->d_name.name, new_dentry->d_name.len);
 765
 766         if (ret)
 767                 return ret;
 768
 769         if (victim_f) {
 770                 /* There was a victim. Kill it off nicely */
 771                 new_dentry->d_inode->i_nlink--;
 772                 /* Don't oops if the victim was a dirent pointing to an
 773                    inode which didn't exist. */
 774                 if (victim_f->inocache) {
 775                         down(&victim_f->sem);
 776                         victim_f->inocache->nlink--;
 777                         up(&victim_f->sem);
 778                 }
 779         }
 780
 781         /* If it was a directory we moved, and there was no victim,
 782            increase i_nlink on its new parent */
 783         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 784                 new_dir_i->i_nlink++;
 785
 786         /* Unlink the original */
 787         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 788                       old_dentry->d_name.name, old_dentry->d_name.len, NULL);
 789
 790         /* We don't touch inode->i_nlink */
 791
 792         if (ret) {
 793                 /* Oh shit. We really ought to make a single node which can do both atomically */
 794                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 795                 down(&f->sem);
 796                 old_dentry->d_inode->i_nlink++;
 797                 if (f->inocache)
 798                         f->inocache->nlink++;
 799                 up(&f->sem);
 800
 801                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 802                 /* Might as well let the VFS know */
 803                 d_instantiate(new_dentry, old_dentry->d_inode);
 804                 atomic_inc(&old_dentry->d_inode->i_count);
 805                 return ret;
 806         }
 807
 808         if (S_ISDIR(old_dentry->d_inode->i_mode))
 809                 old_dir_i->i_nlink--;
 810
 811         return 0;
 812 }
 813