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 <linux/jffs2_fs_i.h>
  21 #include <linux/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 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         dir_f = JFFS2_INODE_INFO(dir_i);
  82         c = JFFS2_SB_INFO(dir_i->i_sb);
  83
  84         down(&dir_f->sem);
  85
  86         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  87         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  88                 if (fd_list->nhash == target->d_name.hash &&
  89                     (!fd || fd_list->version > fd->version) &&
  90                     strlen(fd_list->name) == target->d_name.len &&
  91                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  92                         fd = fd_list;
  93                 }
  94         }
  95         if (fd)
  96                 ino = fd->ino;
  97         up(&dir_f->sem);
  98         if (ino) {
  99                 inode = iget(dir_i->i_sb, ino);
 100                 if (!inode) {
 101                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 102                         return (ERR_PTR(-EIO));
 103                 }
 104         }
 105
 106         d_add(target, inode);
 107
 108         return NULL;
 109 }
 110
 111 /***********************************************************************/
 112
 113
 114 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 115 {
 116         struct jffs2_inode_info *f;
 117         struct jffs2_sb_info *c;
 118         struct inode *inode = filp->f_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_dentry->d_inode->i_ino));
 123
 124         f = JFFS2_INODE_INFO(inode);
 125         c = JFFS2_SB_INFO(inode->i_sb);
 126
 127         offset = filp->f_pos;
 128
 129         if (offset == 0) {
 130                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 131                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 132                         goto out;
 133                 offset++;
 134         }
 135         if (offset == 1) {
 136                 unsigned long pino = parent_ino(filp->f_dentry);
 137                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 138                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 139                         goto out;
 140                 offset++;
 141         }
 142
 143         curofs=1;
 144         down(&f->sem);
 145         for (fd = f->dents; fd; fd = fd->next) {
 146
 147                 curofs++;
 148                 /* First loop: curofs = 2; offset = 2 */
 149                 if (curofs < offset) {
 150                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 151                                   fd->name, fd->ino, fd->type, curofs, offset));
 152                         continue;
 153                 }
 154                 if (!fd->ino) {
 155                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 156                         offset++;
 157                         continue;
 158                 }
 159                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 160                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 161                         break;
 162                 offset++;
 163         }
 164         up(&f->sem);
 165  out:
 166         filp->f_pos = offset;
 167         return 0;
 168 }
 169
 170 /***********************************************************************/
 171
 172
 173 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 174                         struct nameidata *nd)
 175 {
 176         struct jffs2_raw_inode *ri;
 177         struct jffs2_inode_info *f, *dir_f;
 178         struct jffs2_sb_info *c;
 179         struct inode *inode;
 180         int ret;
 181
 182         ri = jffs2_alloc_raw_inode();
 183         if (!ri)
 184                 return -ENOMEM;
 185
 186         c = JFFS2_SB_INFO(dir_i->i_sb);
 187
 188         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 189
 190         inode = jffs2_new_inode(dir_i, mode, ri);
 191
 192         if (IS_ERR(inode)) {
 193                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 194                 jffs2_free_raw_inode(ri);
 195                 return PTR_ERR(inode);
 196         }
 197
 198         inode->i_op = &jffs2_file_inode_operations;
 199         inode->i_fop = &jffs2_file_operations;
 200         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 201         inode->i_mapping->nrpages = 0;
 202
 203         f = JFFS2_INODE_INFO(inode);
 204         dir_f = JFFS2_INODE_INFO(dir_i);
 205
 206         ret = jffs2_do_create(c, dir_f, f, ri,
 207                               dentry->d_name.name, dentry->d_name.len);
 208
 209         if (ret) {
 210                 make_bad_inode(inode);
 211                 iput(inode);
 212                 jffs2_free_raw_inode(ri);
 213                 return ret;
 214         }
 215
 216         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 217
 218         jffs2_free_raw_inode(ri);
 219         d_instantiate(dentry, inode);
 220
 221         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 222                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 223         return 0;
 224 }
 225
 226 /***********************************************************************/
 227
 228
 229 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 230 {
 231         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 232         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 233         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 234         int ret;
 235         uint32_t now = get_seconds();
 236
 237         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 238                               dentry->d_name.len, dead_f, now);
 239         if (dead_f->inocache)
 240                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 241         if (!ret)
 242                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 243         return ret;
 244 }
 245 /***********************************************************************/
 246
 247
 248 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 249 {
 250         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 251         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 252         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 253         int ret;
 254         uint8_t type;
 255         uint32_t now;
 256
 257         /* Don't let people make hard links to bad inodes. */
 258         if (!f->inocache)
 259                 return -EIO;
 260
 261         if (S_ISDIR(old_dentry->d_inode->i_mode))
 262                 return -EPERM;
 263
 264         /* XXX: This is ugly */
 265         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 266         if (!type) type = DT_REG;
 267
 268         now = get_seconds();
 269         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 270
 271         if (!ret) {
 272                 down(&f->sem);
 273                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 274                 up(&f->sem);
 275                 d_instantiate(dentry, old_dentry->d_inode);
 276                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 277                 atomic_inc(&old_dentry->d_inode->i_count);
 278         }
 279         return ret;
 280 }
 281
 282 /***********************************************************************/
 283
 284 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 285 {
 286         struct jffs2_inode_info *f, *dir_f;
 287         struct jffs2_sb_info *c;
 288         struct inode *inode;
 289         struct jffs2_raw_inode *ri;
 290         struct jffs2_raw_dirent *rd;
 291         struct jffs2_full_dnode *fn;
 292         struct jffs2_full_dirent *fd;
 293         int namelen;
 294         uint32_t alloclen, phys_ofs;
 295         int ret, targetlen = strlen(target);
 296
 297         /* FIXME: If you care. We'd need to use frags for the target
 298            if it grows much more than this */
 299         if (targetlen > 254)
 300                 return -EINVAL;
 301
 302         ri = jffs2_alloc_raw_inode();
 303
 304         if (!ri)
 305                 return -ENOMEM;
 306
 307         c = JFFS2_SB_INFO(dir_i->i_sb);
 308
 309         /* Try to reserve enough space for both node and dirent.
 310          * Just the node will do for now, though
 311          */
 312         namelen = dentry->d_name.len;
 313         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen,
 314                                 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 315
 316         if (ret) {
 317                 jffs2_free_raw_inode(ri);
 318                 return ret;
 319         }
 320
 321         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 322
 323         if (IS_ERR(inode)) {
 324                 jffs2_free_raw_inode(ri);
 325                 jffs2_complete_reservation(c);
 326                 return PTR_ERR(inode);
 327         }
 328
 329         inode->i_op = &jffs2_symlink_inode_operations;
 330
 331         f = JFFS2_INODE_INFO(inode);
 332
 333         inode->i_size = targetlen;
 334         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 335         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 336         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 337
 338         ri->compr = JFFS2_COMPR_NONE;
 339         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 340         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 341
 342         fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
 343
 344         jffs2_free_raw_inode(ri);
 345
 346         if (IS_ERR(fn)) {
 347                 /* Eeek. Wave bye bye */
 348                 up(&f->sem);
 349                 jffs2_complete_reservation(c);
 350                 jffs2_clear_inode(inode);
 351                 return PTR_ERR(fn);
 352         }
 353
 354         /* We use f->target field to store the target path. */
 355         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 356         if (!f->target) {
 357                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 358                 up(&f->sem);
 359                 jffs2_complete_reservation(c);
 360                 jffs2_clear_inode(inode);
 361                 return -ENOMEM;
 362         }
 363
 364         memcpy(f->target, target, targetlen + 1);
 365         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 366
 367         /* No data here. Only a metadata node, which will be
 368            obsoleted by the first data write
 369         */
 370         f->metadata = fn;
 371         up(&f->sem);
 372
 373         jffs2_complete_reservation(c);
 374         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 375                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 376         if (ret) {
 377                 /* Eep. */
 378                 jffs2_clear_inode(inode);
 379                 return ret;
 380         }
 381
 382         rd = jffs2_alloc_raw_dirent();
 383         if (!rd) {
 384                 /* Argh. Now we treat it like a normal delete */
 385                 jffs2_complete_reservation(c);
 386                 jffs2_clear_inode(inode);
 387                 return -ENOMEM;
 388         }
 389
 390         dir_f = JFFS2_INODE_INFO(dir_i);
 391         down(&dir_f->sem);
 392
 393         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 394         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 395         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 396         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 397
 398         rd->pino = cpu_to_je32(dir_i->i_ino);
 399         rd->version = cpu_to_je32(++dir_f->highest_version);
 400         rd->ino = cpu_to_je32(inode->i_ino);
 401         rd->mctime = cpu_to_je32(get_seconds());
 402         rd->nsize = namelen;
 403         rd->type = DT_LNK;
 404         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 405         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 406
 407         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 408
 409         if (IS_ERR(fd)) {
 410                 /* dirent failed to write. Delete the inode normally
 411                    as if it were the final unlink() */
 412                 jffs2_complete_reservation(c);
 413                 jffs2_free_raw_dirent(rd);
 414                 up(&dir_f->sem);
 415                 jffs2_clear_inode(inode);
 416                 return PTR_ERR(fd);
 417         }
 418
 419         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 420
 421         jffs2_free_raw_dirent(rd);
 422
 423         /* Link the fd into the inode's list, obsoleting an old
 424            one if necessary. */
 425         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 426
 427         up(&dir_f->sem);
 428         jffs2_complete_reservation(c);
 429
 430         d_instantiate(dentry, inode);
 431         return 0;
 432 }
 433
 434
 435 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 436 {
 437         struct jffs2_inode_info *f, *dir_f;
 438         struct jffs2_sb_info *c;
 439         struct inode *inode;
 440         struct jffs2_raw_inode *ri;
 441         struct jffs2_raw_dirent *rd;
 442         struct jffs2_full_dnode *fn;
 443         struct jffs2_full_dirent *fd;
 444         int namelen;
 445         uint32_t alloclen, phys_ofs;
 446         int ret;
 447
 448         mode |= S_IFDIR;
 449
 450         ri = jffs2_alloc_raw_inode();
 451         if (!ri)
 452                 return -ENOMEM;
 453
 454         c = JFFS2_SB_INFO(dir_i->i_sb);
 455
 456         /* Try to reserve enough space for both node and dirent.
 457          * Just the node will do for now, though
 458          */
 459         namelen = dentry->d_name.len;
 460         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL,
 461                                 JFFS2_SUMMARY_INODE_SIZE);
 462
 463         if (ret) {
 464                 jffs2_free_raw_inode(ri);
 465                 return ret;
 466         }
 467
 468         inode = jffs2_new_inode(dir_i, mode, ri);
 469
 470         if (IS_ERR(inode)) {
 471                 jffs2_free_raw_inode(ri);
 472                 jffs2_complete_reservation(c);
 473                 return PTR_ERR(inode);
 474         }
 475
 476         inode->i_op = &jffs2_dir_inode_operations;
 477         inode->i_fop = &jffs2_dir_operations;
 478         /* Directories get nlink 2 at start */
 479         inode->i_nlink = 2;
 480
 481         f = JFFS2_INODE_INFO(inode);
 482
 483         ri->data_crc = cpu_to_je32(0);
 484         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 485
 486         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 487
 488         jffs2_free_raw_inode(ri);
 489
 490         if (IS_ERR(fn)) {
 491                 /* Eeek. Wave bye bye */
 492                 up(&f->sem);
 493                 jffs2_complete_reservation(c);
 494                 jffs2_clear_inode(inode);
 495                 return PTR_ERR(fn);
 496         }
 497         /* No data here. Only a metadata node, which will be
 498            obsoleted by the first data write
 499         */
 500         f->metadata = fn;
 501         up(&f->sem);
 502
 503         jffs2_complete_reservation(c);
 504         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 505                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 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, dev_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,
 615                                 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 616
 617         if (ret) {
 618                 jffs2_free_raw_inode(ri);
 619                 return ret;
 620         }
 621
 622         inode = jffs2_new_inode(dir_i, mode, ri);
 623
 624         if (IS_ERR(inode)) {
 625                 jffs2_free_raw_inode(ri);
 626                 jffs2_complete_reservation(c);
 627                 return PTR_ERR(inode);
 628         }
 629         inode->i_op = &jffs2_file_inode_operations;
 630         init_special_inode(inode, inode->i_mode, rdev);
 631
 632         f = JFFS2_INODE_INFO(inode);
 633
 634         ri->dsize = ri->csize = cpu_to_je32(devlen);
 635         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 636         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 637
 638         ri->compr = JFFS2_COMPR_NONE;
 639         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 640         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 641
 642         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 643
 644         jffs2_free_raw_inode(ri);
 645
 646         if (IS_ERR(fn)) {
 647                 /* Eeek. Wave bye bye */
 648                 up(&f->sem);
 649                 jffs2_complete_reservation(c);
 650                 jffs2_clear_inode(inode);
 651                 return PTR_ERR(fn);
 652         }
 653         /* No data here. Only a metadata node, which will be
 654            obsoleted by the first data write
 655         */
 656         f->metadata = fn;
 657         up(&f->sem);
 658
 659         jffs2_complete_reservation(c);
 660         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
 661                                 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 662         if (ret) {
 663                 /* Eep. */
 664                 jffs2_clear_inode(inode);
 665                 return ret;
 666         }
 667
 668         rd = jffs2_alloc_raw_dirent();
 669         if (!rd) {
 670                 /* Argh. Now we treat it like a normal delete */
 671                 jffs2_complete_reservation(c);
 672                 jffs2_clear_inode(inode);
 673                 return -ENOMEM;
 674         }
 675
 676         dir_f = JFFS2_INODE_INFO(dir_i);
 677         down(&dir_f->sem);
 678
 679         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 680         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 681         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 682         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 683
 684         rd->pino = cpu_to_je32(dir_i->i_ino);
 685         rd->version = cpu_to_je32(++dir_f->highest_version);
 686         rd->ino = cpu_to_je32(inode->i_ino);
 687         rd->mctime = cpu_to_je32(get_seconds());
 688         rd->nsize = namelen;
 689
 690         /* XXX: This is ugly. */
 691         rd->type = (mode & S_IFMT) >> 12;
 692
 693         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 694         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 695
 696         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 697
 698         if (IS_ERR(fd)) {
 699                 /* dirent failed to write. Delete the inode normally
 700                    as if it were the final unlink() */
 701                 jffs2_complete_reservation(c);
 702                 jffs2_free_raw_dirent(rd);
 703                 up(&dir_f->sem);
 704                 jffs2_clear_inode(inode);
 705                 return PTR_ERR(fd);
 706         }
 707
 708         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 709
 710         jffs2_free_raw_dirent(rd);
 711
 712         /* Link the fd into the inode's list, obsoleting an old
 713            one if necessary. */
 714         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 715
 716         up(&dir_f->sem);
 717         jffs2_complete_reservation(c);
 718
 719         d_instantiate(dentry, inode);
 720
 721         return 0;
 722 }
 723
 724 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 725                         struct inode *new_dir_i, struct dentry *new_dentry)
 726 {
 727         int ret;
 728         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 729         struct jffs2_inode_info *victim_f = NULL;
 730         uint8_t type;
 731         uint32_t now;
 732
 733         /* The VFS will check for us and prevent trying to rename a
 734          * file over a directory and vice versa, but if it's a directory,
 735          * the VFS can't check whether the victim is empty. The filesystem
 736          * needs to do that for itself.
 737          */
 738         if (new_dentry->d_inode) {
 739                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 740                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 741                         struct jffs2_full_dirent *fd;
 742
 743                         down(&victim_f->sem);
 744                         for (fd = victim_f->dents; fd; fd = fd->next) {
 745                                 if (fd->ino) {
 746                                         up(&victim_f->sem);
 747                                         return -ENOTEMPTY;
 748                                 }
 749                         }
 750                         up(&victim_f->sem);
 751                 }
 752         }
 753
 754         /* XXX: We probably ought to alloc enough space for
 755            both nodes at the same time. Writing the new link,
 756            then getting -ENOSPC, is quite bad :)
 757         */
 758
 759         /* Make a hard link */
 760
 761         /* XXX: This is ugly */
 762         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 763         if (!type) type = DT_REG;
 764
 765         now = get_seconds();
 766         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 767                             old_dentry->d_inode->i_ino, type,
 768                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 769
 770         if (ret)
 771                 return ret;
 772
 773         if (victim_f) {
 774                 /* There was a victim. Kill it off nicely */
 775                 new_dentry->d_inode->i_nlink--;
 776                 /* Don't oops if the victim was a dirent pointing to an
 777                    inode which didn't exist. */
 778                 if (victim_f->inocache) {
 779                         down(&victim_f->sem);
 780                         victim_f->inocache->nlink--;
 781                         up(&victim_f->sem);
 782                 }
 783         }
 784
 785         /* If it was a directory we moved, and there was no victim,
 786            increase i_nlink on its new parent */
 787         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 788                 new_dir_i->i_nlink++;
 789
 790         /* Unlink the original */
 791         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 792                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 793
 794         /* We don't touch inode->i_nlink */
 795
 796         if (ret) {
 797                 /* Oh shit. We really ought to make a single node which can do both atomically */
 798                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 799                 down(&f->sem);
 800                 old_dentry->d_inode->i_nlink++;
 801                 if (f->inocache)
 802                         f->inocache->nlink++;
 803                 up(&f->sem);
 804
 805                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 806                 /* Might as well let the VFS know */
 807                 d_instantiate(new_dentry, old_dentry->d_inode);
 808                 atomic_inc(&old_dentry->d_inode->i_count);
 809                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 810                 return ret;
 811         }
 812
 813         if (S_ISDIR(old_dentry->d_inode->i_mode))
 814                 old_dir_i->i_nlink--;
 815
 816         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 817
 818         return 0;
 819 }
 820