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 1.86 2005/07/06 12:13:09 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 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
 236         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 237                                dentry->d_name.len, dead_f);
 238         if (dead_f->inocache)
 239                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 240         return ret;
 241 }
 242 /***********************************************************************/
 243
 244
 245 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 246 {
 247         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 248         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 249         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 250         int ret;
 251         uint8_t type;
 252
 253         /* Don't let people make hard links to bad inodes. */
 254         if (!f->inocache)
 255                 return -EIO;
 256
 257         if (S_ISDIR(old_dentry->d_inode->i_mode))
 258                 return -EPERM;
 259
 260         /* XXX: This is ugly */
 261         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 262         if (!type) type = DT_REG;
 263
 264         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
 265
 266         if (!ret) {
 267                 down(&f->sem);
 268                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 269                 up(&f->sem);
 270                 d_instantiate(dentry, old_dentry->d_inode);
 271                 atomic_inc(&old_dentry->d_inode->i_count);
 272         }
 273         return ret;
 274 }
 275
 276 /***********************************************************************/
 277
 278 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 279 {
 280         struct jffs2_inode_info *f, *dir_f;
 281         struct jffs2_sb_info *c;
 282         struct inode *inode;
 283         struct jffs2_raw_inode *ri;
 284         struct jffs2_raw_dirent *rd;
 285         struct jffs2_full_dnode *fn;
 286         struct jffs2_full_dirent *fd;
 287         int namelen;
 288         uint32_t alloclen, phys_ofs;
 289         int ret, targetlen = strlen(target);
 290
 291         /* FIXME: If you care. We'd need to use frags for the target
 292            if it grows much more than this */
 293         if (targetlen > 254)
 294                 return -EINVAL;
 295
 296         ri = jffs2_alloc_raw_inode();
 297
 298         if (!ri)
 299                 return -ENOMEM;
 300
 301         c = JFFS2_SB_INFO(dir_i->i_sb);
 302
 303         /* Try to reserve enough space for both node and dirent.
 304          * Just the node will do for now, though
 305          */
 306         namelen = dentry->d_name.len;
 307         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 308
 309         if (ret) {
 310                 jffs2_free_raw_inode(ri);
 311                 return ret;
 312         }
 313
 314         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 315
 316         if (IS_ERR(inode)) {
 317                 jffs2_free_raw_inode(ri);
 318                 jffs2_complete_reservation(c);
 319                 return PTR_ERR(inode);
 320         }
 321
 322         inode->i_op = &jffs2_symlink_inode_operations;
 323
 324         f = JFFS2_INODE_INFO(inode);
 325
 326         inode->i_size = targetlen;
 327         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 328         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 329         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 330
 331         ri->compr = JFFS2_COMPR_NONE;
 332         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 333         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 334
 335         fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
 336
 337         jffs2_free_raw_inode(ri);
 338
 339         if (IS_ERR(fn)) {
 340                 /* Eeek. Wave bye bye */
 341                 up(&f->sem);
 342                 jffs2_complete_reservation(c);
 343                 jffs2_clear_inode(inode);
 344                 return PTR_ERR(fn);
 345         }
 346
 347         /* We use f->dents field to store the target path. */
 348         f->dents = kmalloc(targetlen + 1, GFP_KERNEL);
 349         if (!f->dents) {
 350                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 351                 up(&f->sem);
 352                 jffs2_complete_reservation(c);
 353                 jffs2_clear_inode(inode);
 354                 return -ENOMEM;
 355         }
 356
 357         memcpy(f->dents, target, targetlen + 1);
 358         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->dents));
 359
 360         /* No data here. Only a metadata node, which will be
 361            obsoleted by the first data write
 362         */
 363         f->metadata = fn;
 364         up(&f->sem);
 365
 366         jffs2_complete_reservation(c);
 367         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 368         if (ret) {
 369                 /* Eep. */
 370                 jffs2_clear_inode(inode);
 371                 return ret;
 372         }
 373
 374         rd = jffs2_alloc_raw_dirent();
 375         if (!rd) {
 376                 /* Argh. Now we treat it like a normal delete */
 377                 jffs2_complete_reservation(c);
 378                 jffs2_clear_inode(inode);
 379                 return -ENOMEM;
 380         }
 381
 382         dir_f = JFFS2_INODE_INFO(dir_i);
 383         down(&dir_f->sem);
 384
 385         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 386         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 387         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 388         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 389
 390         rd->pino = cpu_to_je32(dir_i->i_ino);
 391         rd->version = cpu_to_je32(++dir_f->highest_version);
 392         rd->ino = cpu_to_je32(inode->i_ino);
 393         rd->mctime = cpu_to_je32(get_seconds());
 394         rd->nsize = namelen;
 395         rd->type = DT_LNK;
 396         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 397         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 398
 399         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 400
 401         if (IS_ERR(fd)) {
 402                 /* dirent failed to write. Delete the inode normally
 403                    as if it were the final unlink() */
 404                 jffs2_complete_reservation(c);
 405                 jffs2_free_raw_dirent(rd);
 406                 up(&dir_f->sem);
 407                 jffs2_clear_inode(inode);
 408                 return PTR_ERR(fd);
 409         }
 410
 411         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 412
 413         jffs2_free_raw_dirent(rd);
 414
 415         /* Link the fd into the inode's list, obsoleting an old
 416            one if necessary. */
 417         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 418
 419         up(&dir_f->sem);
 420         jffs2_complete_reservation(c);
 421
 422         d_instantiate(dentry, inode);
 423         return 0;
 424 }
 425
 426
 427 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 428 {
 429         struct jffs2_inode_info *f, *dir_f;
 430         struct jffs2_sb_info *c;
 431         struct inode *inode;
 432         struct jffs2_raw_inode *ri;
 433         struct jffs2_raw_dirent *rd;
 434         struct jffs2_full_dnode *fn;
 435         struct jffs2_full_dirent *fd;
 436         int namelen;
 437         uint32_t alloclen, phys_ofs;
 438         int ret;
 439
 440         mode |= S_IFDIR;
 441
 442         ri = jffs2_alloc_raw_inode();
 443         if (!ri)
 444                 return -ENOMEM;
 445
 446         c = JFFS2_SB_INFO(dir_i->i_sb);
 447
 448         /* Try to reserve enough space for both node and dirent.
 449          * Just the node will do for now, though
 450          */
 451         namelen = dentry->d_name.len;
 452         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 453
 454         if (ret) {
 455                 jffs2_free_raw_inode(ri);
 456                 return ret;
 457         }
 458
 459         inode = jffs2_new_inode(dir_i, mode, ri);
 460
 461         if (IS_ERR(inode)) {
 462                 jffs2_free_raw_inode(ri);
 463                 jffs2_complete_reservation(c);
 464                 return PTR_ERR(inode);
 465         }
 466
 467         inode->i_op = &jffs2_dir_inode_operations;
 468         inode->i_fop = &jffs2_dir_operations;
 469         /* Directories get nlink 2 at start */
 470         inode->i_nlink = 2;
 471
 472         f = JFFS2_INODE_INFO(inode);
 473
 474         ri->data_crc = cpu_to_je32(0);
 475         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 476
 477         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 478
 479         jffs2_free_raw_inode(ri);
 480
 481         if (IS_ERR(fn)) {
 482                 /* Eeek. Wave bye bye */
 483                 up(&f->sem);
 484                 jffs2_complete_reservation(c);
 485                 jffs2_clear_inode(inode);
 486                 return PTR_ERR(fn);
 487         }
 488         /* No data here. Only a metadata node, which will be
 489            obsoleted by the first data write
 490         */
 491         f->metadata = fn;
 492         up(&f->sem);
 493
 494         jffs2_complete_reservation(c);
 495         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 496         if (ret) {
 497                 /* Eep. */
 498                 jffs2_clear_inode(inode);
 499                 return ret;
 500         }
 501
 502         rd = jffs2_alloc_raw_dirent();
 503         if (!rd) {
 504                 /* Argh. Now we treat it like a normal delete */
 505                 jffs2_complete_reservation(c);
 506                 jffs2_clear_inode(inode);
 507                 return -ENOMEM;
 508         }
 509
 510         dir_f = JFFS2_INODE_INFO(dir_i);
 511         down(&dir_f->sem);
 512
 513         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 514         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 515         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 516         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 517
 518         rd->pino = cpu_to_je32(dir_i->i_ino);
 519         rd->version = cpu_to_je32(++dir_f->highest_version);
 520         rd->ino = cpu_to_je32(inode->i_ino);
 521         rd->mctime = cpu_to_je32(get_seconds());
 522         rd->nsize = namelen;
 523         rd->type = DT_DIR;
 524         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 525         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 526
 527         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 528
 529         if (IS_ERR(fd)) {
 530                 /* dirent failed to write. Delete the inode normally
 531                    as if it were the final unlink() */
 532                 jffs2_complete_reservation(c);
 533                 jffs2_free_raw_dirent(rd);
 534                 up(&dir_f->sem);
 535                 jffs2_clear_inode(inode);
 536                 return PTR_ERR(fd);
 537         }
 538
 539         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 540         dir_i->i_nlink++;
 541
 542         jffs2_free_raw_dirent(rd);
 543
 544         /* Link the fd into the inode's list, obsoleting an old
 545            one if necessary. */
 546         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 547
 548         up(&dir_f->sem);
 549         jffs2_complete_reservation(c);
 550
 551         d_instantiate(dentry, inode);
 552         return 0;
 553 }
 554
 555 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 556 {
 557         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 558         struct jffs2_full_dirent *fd;
 559         int ret;
 560
 561         for (fd = f->dents ; fd; fd = fd->next) {
 562                 if (fd->ino)
 563                         return -ENOTEMPTY;
 564         }
 565         ret = jffs2_unlink(dir_i, dentry);
 566         if (!ret)
 567                 dir_i->i_nlink--;
 568         return ret;
 569 }
 570
 571 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 572 {
 573         struct jffs2_inode_info *f, *dir_f;
 574         struct jffs2_sb_info *c;
 575         struct inode *inode;
 576         struct jffs2_raw_inode *ri;
 577         struct jffs2_raw_dirent *rd;
 578         struct jffs2_full_dnode *fn;
 579         struct jffs2_full_dirent *fd;
 580         int namelen;
 581         jint16_t dev;
 582         int devlen = 0;
 583         uint32_t alloclen, phys_ofs;
 584         int ret;
 585
 586         if (!old_valid_dev(rdev))
 587                 return -EINVAL;
 588
 589         ri = jffs2_alloc_raw_inode();
 590         if (!ri)
 591                 return -ENOMEM;
 592
 593         c = JFFS2_SB_INFO(dir_i->i_sb);
 594
 595         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 596                 dev = cpu_to_je16(old_encode_dev(rdev));
 597                 devlen = sizeof(dev);
 598         }
 599
 600         /* Try to reserve enough space for both node and dirent.
 601          * Just the node will do for now, though
 602          */
 603         namelen = dentry->d_name.len;
 604         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 605
 606         if (ret) {
 607                 jffs2_free_raw_inode(ri);
 608                 return ret;
 609         }
 610
 611         inode = jffs2_new_inode(dir_i, mode, ri);
 612
 613         if (IS_ERR(inode)) {
 614                 jffs2_free_raw_inode(ri);
 615                 jffs2_complete_reservation(c);
 616                 return PTR_ERR(inode);
 617         }
 618         inode->i_op = &jffs2_file_inode_operations;
 619         init_special_inode(inode, inode->i_mode, rdev);
 620
 621         f = JFFS2_INODE_INFO(inode);
 622
 623         ri->dsize = ri->csize = cpu_to_je32(devlen);
 624         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 625         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 626
 627         ri->compr = JFFS2_COMPR_NONE;
 628         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 629         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 630
 631         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 632
 633         jffs2_free_raw_inode(ri);
 634
 635         if (IS_ERR(fn)) {
 636                 /* Eeek. Wave bye bye */
 637                 up(&f->sem);
 638                 jffs2_complete_reservation(c);
 639                 jffs2_clear_inode(inode);
 640                 return PTR_ERR(fn);
 641         }
 642         /* No data here. Only a metadata node, which will be
 643            obsoleted by the first data write
 644         */
 645         f->metadata = fn;
 646         up(&f->sem);
 647
 648         jffs2_complete_reservation(c);
 649         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 650         if (ret) {
 651                 /* Eep. */
 652                 jffs2_clear_inode(inode);
 653                 return ret;
 654         }
 655
 656         rd = jffs2_alloc_raw_dirent();
 657         if (!rd) {
 658                 /* Argh. Now we treat it like a normal delete */
 659                 jffs2_complete_reservation(c);
 660                 jffs2_clear_inode(inode);
 661                 return -ENOMEM;
 662         }
 663
 664         dir_f = JFFS2_INODE_INFO(dir_i);
 665         down(&dir_f->sem);
 666
 667         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 668         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 669         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 670         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 671
 672         rd->pino = cpu_to_je32(dir_i->i_ino);
 673         rd->version = cpu_to_je32(++dir_f->highest_version);
 674         rd->ino = cpu_to_je32(inode->i_ino);
 675         rd->mctime = cpu_to_je32(get_seconds());
 676         rd->nsize = namelen;
 677
 678         /* XXX: This is ugly. */
 679         rd->type = (mode & S_IFMT) >> 12;
 680
 681         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 682         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 683
 684         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 685
 686         if (IS_ERR(fd)) {
 687                 /* dirent failed to write. Delete the inode normally
 688                    as if it were the final unlink() */
 689                 jffs2_complete_reservation(c);
 690                 jffs2_free_raw_dirent(rd);
 691                 up(&dir_f->sem);
 692                 jffs2_clear_inode(inode);
 693                 return PTR_ERR(fd);
 694         }
 695
 696         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 697
 698         jffs2_free_raw_dirent(rd);
 699
 700         /* Link the fd into the inode's list, obsoleting an old
 701            one if necessary. */
 702         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 703
 704         up(&dir_f->sem);
 705         jffs2_complete_reservation(c);
 706
 707         d_instantiate(dentry, inode);
 708
 709         return 0;
 710 }
 711
 712 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 713                         struct inode *new_dir_i, struct dentry *new_dentry)
 714 {
 715         int ret;
 716         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 717         struct jffs2_inode_info *victim_f = NULL;
 718         uint8_t type;
 719
 720         /* The VFS will check for us and prevent trying to rename a
 721          * file over a directory and vice versa, but if it's a directory,
 722          * the VFS can't check whether the victim is empty. The filesystem
 723          * needs to do that for itself.
 724          */
 725         if (new_dentry->d_inode) {
 726                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 727                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 728                         struct jffs2_full_dirent *fd;
 729
 730                         down(&victim_f->sem);
 731                         for (fd = victim_f->dents; fd; fd = fd->next) {
 732                                 if (fd->ino) {
 733                                         up(&victim_f->sem);
 734                                         return -ENOTEMPTY;
 735                                 }
 736                         }
 737                         up(&victim_f->sem);
 738                 }
 739         }
 740
 741         /* XXX: We probably ought to alloc enough space for
 742            both nodes at the same time. Writing the new link,
 743            then getting -ENOSPC, is quite bad :)
 744         */
 745
 746         /* Make a hard link */
 747
 748         /* XXX: This is ugly */
 749         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 750         if (!type) type = DT_REG;
 751
 752         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 753                             old_dentry->d_inode->i_ino, type,
 754                             new_dentry->d_name.name, new_dentry->d_name.len);
 755
 756         if (ret)
 757                 return ret;
 758
 759         if (victim_f) {
 760                 /* There was a victim. Kill it off nicely */
 761                 new_dentry->d_inode->i_nlink--;
 762                 /* Don't oops if the victim was a dirent pointing to an
 763                    inode which didn't exist. */
 764                 if (victim_f->inocache) {
 765                         down(&victim_f->sem);
 766                         victim_f->inocache->nlink--;
 767                         up(&victim_f->sem);
 768                 }
 769         }
 770
 771         /* If it was a directory we moved, and there was no victim,
 772            increase i_nlink on its new parent */
 773         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 774                 new_dir_i->i_nlink++;
 775
 776         /* Unlink the original */
 777         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 778                       old_dentry->d_name.name, old_dentry->d_name.len, NULL);
 779
 780         /* We don't touch inode->i_nlink */
 781
 782         if (ret) {
 783                 /* Oh shit. We really ought to make a single node which can do both atomically */
 784                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 785                 down(&f->sem);
 786                 old_dentry->d_inode->i_nlink++;
 787                 if (f->inocache)
 788                         f->inocache->nlink++;
 789                 up(&f->sem);
 790
 791                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 792                 /* Might as well let the VFS know */
 793                 d_instantiate(new_dentry, old_dentry->d_inode);
 794                 atomic_inc(&old_dentry->d_inode->i_count);
 795                 return ret;
 796         }
 797
 798         if (S_ISDIR(old_dentry->d_inode->i_mode))
 799                 old_dir_i->i_nlink--;
 800
 801         return 0;
 802 }
 803