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 1.84 2004/11/16 20:36:11 dwmw2 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;
 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 (strlen(target) > 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) + strlen(target), &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 = strlen(target);
 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, strlen(target)));
 343         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 344
 345         fn = jffs2_write_dnode(c, f, ri, target, strlen(target), 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         /* No data here. Only a metadata node, which will be
 357            obsoleted by the first data write
 358         */
 359         f->metadata = fn;
 360         up(&f->sem);
 361
 362         jffs2_complete_reservation(c);
 363         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 364         if (ret) {
 365                 /* Eep. */
 366                 jffs2_clear_inode(inode);
 367                 return ret;
 368         }
 369
 370         rd = jffs2_alloc_raw_dirent();
 371         if (!rd) {
 372                 /* Argh. Now we treat it like a normal delete */
 373                 jffs2_complete_reservation(c);
 374                 jffs2_clear_inode(inode);
 375                 return -ENOMEM;
 376         }
 377
 378         dir_f = JFFS2_INODE_INFO(dir_i);
 379         down(&dir_f->sem);
 380
 381         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 382         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 383         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 384         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 385
 386         rd->pino = cpu_to_je32(dir_i->i_ino);
 387         rd->version = cpu_to_je32(++dir_f->highest_version);
 388         rd->ino = cpu_to_je32(inode->i_ino);
 389         rd->mctime = cpu_to_je32(get_seconds());
 390         rd->nsize = namelen;
 391         rd->type = DT_LNK;
 392         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 393         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 394
 395         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 396
 397         if (IS_ERR(fd)) {
 398                 /* dirent failed to write. Delete the inode normally
 399                    as if it were the final unlink() */
 400                 jffs2_complete_reservation(c);
 401                 jffs2_free_raw_dirent(rd);
 402                 up(&dir_f->sem);
 403                 jffs2_clear_inode(inode);
 404                 return PTR_ERR(fd);
 405         }
 406
 407         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 408
 409         jffs2_free_raw_dirent(rd);
 410
 411         /* Link the fd into the inode's list, obsoleting an old
 412            one if necessary. */
 413         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 414
 415         up(&dir_f->sem);
 416         jffs2_complete_reservation(c);
 417
 418         d_instantiate(dentry, inode);
 419         return 0;
 420 }
 421
 422
 423 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 424 {
 425         struct jffs2_inode_info *f, *dir_f;
 426         struct jffs2_sb_info *c;
 427         struct inode *inode;
 428         struct jffs2_raw_inode *ri;
 429         struct jffs2_raw_dirent *rd;
 430         struct jffs2_full_dnode *fn;
 431         struct jffs2_full_dirent *fd;
 432         int namelen;
 433         uint32_t alloclen, phys_ofs;
 434         int ret;
 435
 436         mode |= S_IFDIR;
 437
 438         ri = jffs2_alloc_raw_inode();
 439         if (!ri)
 440                 return -ENOMEM;
 441
 442         c = JFFS2_SB_INFO(dir_i->i_sb);
 443
 444         /* Try to reserve enough space for both node and dirent.
 445          * Just the node will do for now, though
 446          */
 447         namelen = dentry->d_name.len;
 448         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 449
 450         if (ret) {
 451                 jffs2_free_raw_inode(ri);
 452                 return ret;
 453         }
 454
 455         inode = jffs2_new_inode(dir_i, mode, ri);
 456
 457         if (IS_ERR(inode)) {
 458                 jffs2_free_raw_inode(ri);
 459                 jffs2_complete_reservation(c);
 460                 return PTR_ERR(inode);
 461         }
 462
 463         inode->i_op = &jffs2_dir_inode_operations;
 464         inode->i_fop = &jffs2_dir_operations;
 465         /* Directories get nlink 2 at start */
 466         inode->i_nlink = 2;
 467
 468         f = JFFS2_INODE_INFO(inode);
 469
 470         ri->data_crc = cpu_to_je32(0);
 471         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 472
 473         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 474
 475         jffs2_free_raw_inode(ri);
 476
 477         if (IS_ERR(fn)) {
 478                 /* Eeek. Wave bye bye */
 479                 up(&f->sem);
 480                 jffs2_complete_reservation(c);
 481                 jffs2_clear_inode(inode);
 482                 return PTR_ERR(fn);
 483         }
 484         /* No data here. Only a metadata node, which will be
 485            obsoleted by the first data write
 486         */
 487         f->metadata = fn;
 488         up(&f->sem);
 489
 490         jffs2_complete_reservation(c);
 491         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 492         if (ret) {
 493                 /* Eep. */
 494                 jffs2_clear_inode(inode);
 495                 return ret;
 496         }
 497
 498         rd = jffs2_alloc_raw_dirent();
 499         if (!rd) {
 500                 /* Argh. Now we treat it like a normal delete */
 501                 jffs2_complete_reservation(c);
 502                 jffs2_clear_inode(inode);
 503                 return -ENOMEM;
 504         }
 505
 506         dir_f = JFFS2_INODE_INFO(dir_i);
 507         down(&dir_f->sem);
 508
 509         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 510         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 511         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 512         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 513
 514         rd->pino = cpu_to_je32(dir_i->i_ino);
 515         rd->version = cpu_to_je32(++dir_f->highest_version);
 516         rd->ino = cpu_to_je32(inode->i_ino);
 517         rd->mctime = cpu_to_je32(get_seconds());
 518         rd->nsize = namelen;
 519         rd->type = DT_DIR;
 520         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 521         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 522
 523         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 524
 525         if (IS_ERR(fd)) {
 526                 /* dirent failed to write. Delete the inode normally
 527                    as if it were the final unlink() */
 528                 jffs2_complete_reservation(c);
 529                 jffs2_free_raw_dirent(rd);
 530                 up(&dir_f->sem);
 531                 jffs2_clear_inode(inode);
 532                 return PTR_ERR(fd);
 533         }
 534
 535         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 536         dir_i->i_nlink++;
 537
 538         jffs2_free_raw_dirent(rd);
 539
 540         /* Link the fd into the inode's list, obsoleting an old
 541            one if necessary. */
 542         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 543
 544         up(&dir_f->sem);
 545         jffs2_complete_reservation(c);
 546
 547         d_instantiate(dentry, inode);
 548         return 0;
 549 }
 550
 551 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 552 {
 553         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 554         struct jffs2_full_dirent *fd;
 555         int ret;
 556
 557         for (fd = f->dents ; fd; fd = fd->next) {
 558                 if (fd->ino)
 559                         return -ENOTEMPTY;
 560         }
 561         ret = jffs2_unlink(dir_i, dentry);
 562         if (!ret)
 563                 dir_i->i_nlink--;
 564         return ret;
 565 }
 566
 567 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev)
 568 {
 569         struct jffs2_inode_info *f, *dir_f;
 570         struct jffs2_sb_info *c;
 571         struct inode *inode;
 572         struct jffs2_raw_inode *ri;
 573         struct jffs2_raw_dirent *rd;
 574         struct jffs2_full_dnode *fn;
 575         struct jffs2_full_dirent *fd;
 576         int namelen;
 577         jint16_t dev;
 578         int devlen = 0;
 579         uint32_t alloclen, phys_ofs;
 580         int ret;
 581
 582         if (!old_valid_dev(rdev))
 583                 return -EINVAL;
 584
 585         ri = jffs2_alloc_raw_inode();
 586         if (!ri)
 587                 return -ENOMEM;
 588
 589         c = JFFS2_SB_INFO(dir_i->i_sb);
 590
 591         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 592                 dev = cpu_to_je16(old_encode_dev(rdev));
 593                 devlen = sizeof(dev);
 594         }
 595
 596         /* Try to reserve enough space for both node and dirent.
 597          * Just the node will do for now, though
 598          */
 599         namelen = dentry->d_name.len;
 600         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 601
 602         if (ret) {
 603                 jffs2_free_raw_inode(ri);
 604                 return ret;
 605         }
 606
 607         inode = jffs2_new_inode(dir_i, mode, ri);
 608
 609         if (IS_ERR(inode)) {
 610                 jffs2_free_raw_inode(ri);
 611                 jffs2_complete_reservation(c);
 612                 return PTR_ERR(inode);
 613         }
 614         inode->i_op = &jffs2_file_inode_operations;
 615         init_special_inode(inode, inode->i_mode, rdev);
 616
 617         f = JFFS2_INODE_INFO(inode);
 618
 619         ri->dsize = ri->csize = cpu_to_je32(devlen);
 620         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 621         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 622
 623         ri->compr = JFFS2_COMPR_NONE;
 624         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 625         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 626
 627         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 628
 629         jffs2_free_raw_inode(ri);
 630
 631         if (IS_ERR(fn)) {
 632                 /* Eeek. Wave bye bye */
 633                 up(&f->sem);
 634                 jffs2_complete_reservation(c);
 635                 jffs2_clear_inode(inode);
 636                 return PTR_ERR(fn);
 637         }
 638         /* No data here. Only a metadata node, which will be
 639            obsoleted by the first data write
 640         */
 641         f->metadata = fn;
 642         up(&f->sem);
 643
 644         jffs2_complete_reservation(c);
 645         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 646         if (ret) {
 647                 /* Eep. */
 648                 jffs2_clear_inode(inode);
 649                 return ret;
 650         }
 651
 652         rd = jffs2_alloc_raw_dirent();
 653         if (!rd) {
 654                 /* Argh. Now we treat it like a normal delete */
 655                 jffs2_complete_reservation(c);
 656                 jffs2_clear_inode(inode);
 657                 return -ENOMEM;
 658         }
 659
 660         dir_f = JFFS2_INODE_INFO(dir_i);
 661         down(&dir_f->sem);
 662
 663         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 664         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 665         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 666         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 667
 668         rd->pino = cpu_to_je32(dir_i->i_ino);
 669         rd->version = cpu_to_je32(++dir_f->highest_version);
 670         rd->ino = cpu_to_je32(inode->i_ino);
 671         rd->mctime = cpu_to_je32(get_seconds());
 672         rd->nsize = namelen;
 673
 674         /* XXX: This is ugly. */
 675         rd->type = (mode & S_IFMT) >> 12;
 676
 677         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 678         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 679
 680         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 681
 682         if (IS_ERR(fd)) {
 683                 /* dirent failed to write. Delete the inode normally
 684                    as if it were the final unlink() */
 685                 jffs2_complete_reservation(c);
 686                 jffs2_free_raw_dirent(rd);
 687                 up(&dir_f->sem);
 688                 jffs2_clear_inode(inode);
 689                 return PTR_ERR(fd);
 690         }
 691
 692         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 693
 694         jffs2_free_raw_dirent(rd);
 695
 696         /* Link the fd into the inode's list, obsoleting an old
 697            one if necessary. */
 698         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 699
 700         up(&dir_f->sem);
 701         jffs2_complete_reservation(c);
 702
 703         d_instantiate(dentry, inode);
 704
 705         return 0;
 706 }
 707
 708 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 709                         struct inode *new_dir_i, struct dentry *new_dentry)
 710 {
 711         int ret;
 712         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 713         struct jffs2_inode_info *victim_f = NULL;
 714         uint8_t type;
 715
 716         /* The VFS will check for us and prevent trying to rename a
 717          * file over a directory and vice versa, but if it's a directory,
 718          * the VFS can't check whether the victim is empty. The filesystem
 719          * needs to do that for itself.
 720          */
 721         if (new_dentry->d_inode) {
 722                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 723                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 724                         struct jffs2_full_dirent *fd;
 725
 726                         down(&victim_f->sem);
 727                         for (fd = victim_f->dents; fd; fd = fd->next) {
 728                                 if (fd->ino) {
 729                                         up(&victim_f->sem);
 730                                         return -ENOTEMPTY;
 731                                 }
 732                         }
 733                         up(&victim_f->sem);
 734                 }
 735         }
 736
 737         /* XXX: We probably ought to alloc enough space for
 738            both nodes at the same time. Writing the new link,
 739            then getting -ENOSPC, is quite bad :)
 740         */
 741
 742         /* Make a hard link */
 743
 744         /* XXX: This is ugly */
 745         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 746         if (!type) type = DT_REG;
 747
 748         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 749                             old_dentry->d_inode->i_ino, type,
 750                             new_dentry->d_name.name, new_dentry->d_name.len);
 751
 752         if (ret)
 753                 return ret;
 754
 755         if (victim_f) {
 756                 /* There was a victim. Kill it off nicely */
 757                 new_dentry->d_inode->i_nlink--;
 758                 /* Don't oops if the victim was a dirent pointing to an
 759                    inode which didn't exist. */
 760                 if (victim_f->inocache) {
 761                         down(&victim_f->sem);
 762                         victim_f->inocache->nlink--;
 763                         up(&victim_f->sem);
 764                 }
 765         }
 766
 767         /* If it was a directory we moved, and there was no victim,
 768            increase i_nlink on its new parent */
 769         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 770                 new_dir_i->i_nlink++;
 771
 772         /* Unlink the original */
 773         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 774                       old_dentry->d_name.name, old_dentry->d_name.len, NULL);
 775
 776         /* We don't touch inode->i_nlink */
 777
 778         if (ret) {
 779                 /* Oh shit. We really ought to make a single node which can do both atomically */
 780                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 781                 down(&f->sem);
 782                 old_dentry->d_inode->i_nlink++;
 783                 if (f->inocache)
 784                         f->inocache->nlink++;
 785                 up(&f->sem);
 786
 787                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 788                 /* Might as well let the VFS know */
 789                 d_instantiate(new_dentry, old_dentry->d_inode);
 790                 atomic_inc(&old_dentry->d_inode->i_count);
 791                 return ret;
 792         }
 793
 794         if (S_ISDIR(old_dentry->d_inode->i_mode))
 795                 old_dir_i->i_nlink--;
 796
 797         return 0;
 798 }
 799