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@redhat.com>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  * $Id: dir.c,v 1.82 2003/10/11 11:47:23 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                 jffs2_clear_inode(inode);
 221                 make_bad_inode(inode);
 222                 iput(inode);
 223                 jffs2_free_raw_inode(ri);
 224                 return ret;
 225         }
 226
 227         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 228
 229         jffs2_free_raw_inode(ri);
 230         d_instantiate(dentry, inode);
 231
 232         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 233                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 234         return 0;
 235 }
 236
 237 /***********************************************************************/
 238
 239
 240 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 241 {
 242         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 243         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 244         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 245         int ret;
 246
 247         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 248                                dentry->d_name.len, dead_f);
 249         if (dead_f->inocache)
 250                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 251         return ret;
 252 }
 253 /***********************************************************************/
 254
 255
 256 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 257 {
 258         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 259         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 260         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 261         int ret;
 262         uint8_t type;
 263
 264         /* Don't let people make hard links to bad inodes. */
 265         if (!f->inocache)
 266                 return -EIO;
 267
 268         if (S_ISDIR(old_dentry->d_inode->i_mode))
 269                 return -EPERM;
 270
 271         /* XXX: This is ugly */
 272         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 273         if (!type) type = DT_REG;
 274
 275         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len);
 276
 277         if (!ret) {
 278                 down(&f->sem);
 279                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 280                 up(&f->sem);
 281                 d_instantiate(dentry, old_dentry->d_inode);
 282                 atomic_inc(&old_dentry->d_inode->i_count);
 283         }
 284         return ret;
 285 }
 286
 287 /***********************************************************************/
 288
 289 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 290 {
 291         struct jffs2_inode_info *f, *dir_f;
 292         struct jffs2_sb_info *c;
 293         struct inode *inode;
 294         struct jffs2_raw_inode *ri;
 295         struct jffs2_raw_dirent *rd;
 296         struct jffs2_full_dnode *fn;
 297         struct jffs2_full_dirent *fd;
 298         int namelen;
 299         uint32_t alloclen, phys_ofs;
 300         int ret;
 301
 302         /* FIXME: If you care. We'd need to use frags for the target
 303            if it grows much more than this */
 304         if (strlen(target) > 254)
 305                 return -EINVAL;
 306
 307         ri = jffs2_alloc_raw_inode();
 308
 309         if (!ri)
 310                 return -ENOMEM;
 311
 312         c = JFFS2_SB_INFO(dir_i->i_sb);
 313
 314         /* Try to reserve enough space for both node and dirent.
 315          * Just the node will do for now, though
 316          */
 317         namelen = dentry->d_name.len;
 318         ret = jffs2_reserve_space(c, sizeof(*ri) + strlen(target), &phys_ofs, &alloclen, ALLOC_NORMAL);
 319
 320         if (ret) {
 321                 jffs2_free_raw_inode(ri);
 322                 return ret;
 323         }
 324
 325         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 326
 327         if (IS_ERR(inode)) {
 328                 jffs2_free_raw_inode(ri);
 329                 jffs2_complete_reservation(c);
 330                 return PTR_ERR(inode);
 331         }
 332
 333         inode->i_op = &jffs2_symlink_inode_operations;
 334
 335         f = JFFS2_INODE_INFO(inode);
 336
 337         inode->i_size = strlen(target);
 338         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 339         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 340         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 341
 342         ri->compr = JFFS2_COMPR_NONE;
 343         ri->data_crc = cpu_to_je32(crc32(0, target, strlen(target)));
 344         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 345
 346         fn = jffs2_write_dnode(c, f, ri, target, strlen(target), phys_ofs, ALLOC_NORMAL);
 347
 348         jffs2_free_raw_inode(ri);
 349
 350         if (IS_ERR(fn)) {
 351                 /* Eeek. Wave bye bye */
 352                 up(&f->sem);
 353                 jffs2_complete_reservation(c);
 354                 jffs2_clear_inode(inode);
 355                 return PTR_ERR(fn);
 356         }
 357         /* No data here. Only a metadata node, which will be
 358            obsoleted by the first data write
 359         */
 360         f->metadata = fn;
 361         up(&f->sem);
 362
 363         jffs2_complete_reservation(c);
 364         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 365         if (ret) {
 366                 /* Eep. */
 367                 jffs2_clear_inode(inode);
 368                 return ret;
 369         }
 370
 371         rd = jffs2_alloc_raw_dirent();
 372         if (!rd) {
 373                 /* Argh. Now we treat it like a normal delete */
 374                 jffs2_complete_reservation(c);
 375                 jffs2_clear_inode(inode);
 376                 return -ENOMEM;
 377         }
 378
 379         dir_f = JFFS2_INODE_INFO(dir_i);
 380         down(&dir_f->sem);
 381
 382         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 383         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 384         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 385         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 386
 387         rd->pino = cpu_to_je32(dir_i->i_ino);
 388         rd->version = cpu_to_je32(++dir_f->highest_version);
 389         rd->ino = cpu_to_je32(inode->i_ino);
 390         rd->mctime = cpu_to_je32(get_seconds());
 391         rd->nsize = namelen;
 392         rd->type = DT_LNK;
 393         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 394         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 395
 396         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 397
 398         if (IS_ERR(fd)) {
 399                 /* dirent failed to write. Delete the inode normally
 400                    as if it were the final unlink() */
 401                 jffs2_complete_reservation(c);
 402                 jffs2_free_raw_dirent(rd);
 403                 up(&dir_f->sem);
 404                 jffs2_clear_inode(inode);
 405                 return PTR_ERR(fd);
 406         }
 407
 408         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 409
 410         jffs2_free_raw_dirent(rd);
 411
 412         /* Link the fd into the inode's list, obsoleting an old
 413            one if necessary. */
 414         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 415
 416         up(&dir_f->sem);
 417         jffs2_complete_reservation(c);
 418
 419         d_instantiate(dentry, inode);
 420         return 0;
 421 }
 422
 423
 424 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 425 {
 426         struct jffs2_inode_info *f, *dir_f;
 427         struct jffs2_sb_info *c;
 428         struct inode *inode;
 429         struct jffs2_raw_inode *ri;
 430         struct jffs2_raw_dirent *rd;
 431         struct jffs2_full_dnode *fn;
 432         struct jffs2_full_dirent *fd;
 433         int namelen;
 434         uint32_t alloclen, phys_ofs;
 435         int ret;
 436
 437         mode |= S_IFDIR;
 438
 439         ri = jffs2_alloc_raw_inode();
 440         if (!ri)
 441                 return -ENOMEM;
 442
 443         c = JFFS2_SB_INFO(dir_i->i_sb);
 444
 445         /* Try to reserve enough space for both node and dirent.
 446          * Just the node will do for now, though
 447          */
 448         namelen = dentry->d_name.len;
 449         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 450
 451         if (ret) {
 452                 jffs2_free_raw_inode(ri);
 453                 return ret;
 454         }
 455
 456         inode = jffs2_new_inode(dir_i, mode, ri);
 457
 458         if (IS_ERR(inode)) {
 459                 jffs2_free_raw_inode(ri);
 460                 jffs2_complete_reservation(c);
 461                 return PTR_ERR(inode);
 462         }
 463
 464         inode->i_op = &jffs2_dir_inode_operations;
 465         inode->i_fop = &jffs2_dir_operations;
 466         /* Directories get nlink 2 at start */
 467         inode->i_nlink = 2;
 468
 469         f = JFFS2_INODE_INFO(inode);
 470
 471         ri->data_crc = cpu_to_je32(0);
 472         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 473
 474         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 475
 476         jffs2_free_raw_inode(ri);
 477
 478         if (IS_ERR(fn)) {
 479                 /* Eeek. Wave bye bye */
 480                 up(&f->sem);
 481                 jffs2_complete_reservation(c);
 482                 jffs2_clear_inode(inode);
 483                 return PTR_ERR(fn);
 484         }
 485         /* No data here. Only a metadata node, which will be
 486            obsoleted by the first data write
 487         */
 488         f->metadata = fn;
 489         up(&f->sem);
 490
 491         jffs2_complete_reservation(c);
 492         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 493         if (ret) {
 494                 /* Eep. */
 495                 jffs2_clear_inode(inode);
 496                 return ret;
 497         }
 498
 499         rd = jffs2_alloc_raw_dirent();
 500         if (!rd) {
 501                 /* Argh. Now we treat it like a normal delete */
 502                 jffs2_complete_reservation(c);
 503                 jffs2_clear_inode(inode);
 504                 return -ENOMEM;
 505         }
 506
 507         dir_f = JFFS2_INODE_INFO(dir_i);
 508         down(&dir_f->sem);
 509
 510         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 511         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 512         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 513         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 514
 515         rd->pino = cpu_to_je32(dir_i->i_ino);
 516         rd->version = cpu_to_je32(++dir_f->highest_version);
 517         rd->ino = cpu_to_je32(inode->i_ino);
 518         rd->mctime = cpu_to_je32(get_seconds());
 519         rd->nsize = namelen;
 520         rd->type = DT_DIR;
 521         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 522         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 523
 524         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 525
 526         if (IS_ERR(fd)) {
 527                 /* dirent failed to write. Delete the inode normally
 528                    as if it were the final unlink() */
 529                 jffs2_complete_reservation(c);
 530                 jffs2_free_raw_dirent(rd);
 531                 up(&dir_f->sem);
 532                 jffs2_clear_inode(inode);
 533                 return PTR_ERR(fd);
 534         }
 535
 536         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 537         dir_i->i_nlink++;
 538
 539         jffs2_free_raw_dirent(rd);
 540
 541         /* Link the fd into the inode's list, obsoleting an old
 542            one if necessary. */
 543         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 544
 545         up(&dir_f->sem);
 546         jffs2_complete_reservation(c);
 547
 548         d_instantiate(dentry, inode);
 549         return 0;
 550 }
 551
 552 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 553 {
 554         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 555         struct jffs2_full_dirent *fd;
 556         int ret;
 557
 558         for (fd = f->dents ; fd; fd = fd->next) {
 559                 if (fd->ino)
 560                         return -ENOTEMPTY;
 561         }
 562         ret = jffs2_unlink(dir_i, dentry);
 563         if (!ret)
 564                 dir_i->i_nlink--;
 565         return ret;
 566 }
 567
 568 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, mknod_arg_t rdev)
 569 {
 570         struct jffs2_inode_info *f, *dir_f;
 571         struct jffs2_sb_info *c;
 572         struct inode *inode;
 573         struct jffs2_raw_inode *ri;
 574         struct jffs2_raw_dirent *rd;
 575         struct jffs2_full_dnode *fn;
 576         struct jffs2_full_dirent *fd;
 577         int namelen;
 578         jint16_t dev;
 579         int devlen = 0;
 580         uint32_t alloclen, phys_ofs;
 581         int ret;
 582
 583         if (!old_valid_dev(rdev))
 584                 return -EINVAL;
 585
 586         ri = jffs2_alloc_raw_inode();
 587         if (!ri)
 588                 return -ENOMEM;
 589
 590         c = JFFS2_SB_INFO(dir_i->i_sb);
 591
 592         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 593                 dev = cpu_to_je16(old_encode_dev(rdev));
 594                 devlen = sizeof(dev);
 595         }
 596
 597         /* Try to reserve enough space for both node and dirent.
 598          * Just the node will do for now, though
 599          */
 600         namelen = dentry->d_name.len;
 601         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 602
 603         if (ret) {
 604                 jffs2_free_raw_inode(ri);
 605                 return ret;
 606         }
 607
 608         inode = jffs2_new_inode(dir_i, mode, ri);
 609
 610         if (IS_ERR(inode)) {
 611                 jffs2_free_raw_inode(ri);
 612                 jffs2_complete_reservation(c);
 613                 return PTR_ERR(inode);
 614         }
 615         inode->i_op = &jffs2_file_inode_operations;
 616         init_special_inode(inode, inode->i_mode, rdev);
 617
 618         f = JFFS2_INODE_INFO(inode);
 619
 620         ri->dsize = ri->csize = cpu_to_je32(devlen);
 621         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 622         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 623
 624         ri->compr = JFFS2_COMPR_NONE;
 625         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 626         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 627
 628         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 629
 630         jffs2_free_raw_inode(ri);
 631
 632         if (IS_ERR(fn)) {
 633                 /* Eeek. Wave bye bye */
 634                 up(&f->sem);
 635                 jffs2_complete_reservation(c);
 636                 jffs2_clear_inode(inode);
 637                 return PTR_ERR(fn);
 638         }
 639         /* No data here. Only a metadata node, which will be
 640            obsoleted by the first data write
 641         */
 642         f->metadata = fn;
 643         up(&f->sem);
 644
 645         jffs2_complete_reservation(c);
 646         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 647         if (ret) {
 648                 /* Eep. */
 649                 jffs2_clear_inode(inode);
 650                 return ret;
 651         }
 652
 653         rd = jffs2_alloc_raw_dirent();
 654         if (!rd) {
 655                 /* Argh. Now we treat it like a normal delete */
 656                 jffs2_complete_reservation(c);
 657                 jffs2_clear_inode(inode);
 658                 return -ENOMEM;
 659         }
 660
 661         dir_f = JFFS2_INODE_INFO(dir_i);
 662         down(&dir_f->sem);
 663
 664         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 665         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 666         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 667         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 668
 669         rd->pino = cpu_to_je32(dir_i->i_ino);
 670         rd->version = cpu_to_je32(++dir_f->highest_version);
 671         rd->ino = cpu_to_je32(inode->i_ino);
 672         rd->mctime = cpu_to_je32(get_seconds());
 673         rd->nsize = namelen;
 674
 675         /* XXX: This is ugly. */
 676         rd->type = (mode & S_IFMT) >> 12;
 677
 678         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 679         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 680
 681         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 682
 683         if (IS_ERR(fd)) {
 684                 /* dirent failed to write. Delete the inode normally
 685                    as if it were the final unlink() */
 686                 jffs2_complete_reservation(c);
 687                 jffs2_free_raw_dirent(rd);
 688                 up(&dir_f->sem);
 689                 jffs2_clear_inode(inode);
 690                 return PTR_ERR(fd);
 691         }
 692
 693         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 694
 695         jffs2_free_raw_dirent(rd);
 696
 697         /* Link the fd into the inode's list, obsoleting an old
 698            one if necessary. */
 699         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 700
 701         up(&dir_f->sem);
 702         jffs2_complete_reservation(c);
 703
 704         d_instantiate(dentry, inode);
 705
 706         return 0;
 707 }
 708
 709 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 710                         struct inode *new_dir_i, struct dentry *new_dentry)
 711 {
 712         int ret;
 713         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 714         struct jffs2_inode_info *victim_f = NULL;
 715         uint8_t type;
 716
 717         /* The VFS will check for us and prevent trying to rename a
 718          * file over a directory and vice versa, but if it's a directory,
 719          * the VFS can't check whether the victim is empty. The filesystem
 720          * needs to do that for itself.
 721          */
 722         if (new_dentry->d_inode) {
 723                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 724                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 725                         struct jffs2_full_dirent *fd;
 726
 727                         down(&victim_f->sem);
 728                         for (fd = victim_f->dents; fd; fd = fd->next) {
 729                                 if (fd->ino) {
 730                                         up(&victim_f->sem);
 731                                         return -ENOTEMPTY;
 732                                 }
 733                         }
 734                         up(&victim_f->sem);
 735                 }
 736         }
 737
 738         /* XXX: We probably ought to alloc enough space for
 739            both nodes at the same time. Writing the new link,
 740            then getting -ENOSPC, is quite bad :)
 741         */
 742
 743         /* Make a hard link */
 744
 745         /* XXX: This is ugly */
 746         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 747         if (!type) type = DT_REG;
 748
 749         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 750                             old_dentry->d_inode->i_ino, type,
 751                             new_dentry->d_name.name, new_dentry->d_name.len);
 752
 753         if (ret)
 754                 return ret;
 755
 756         if (victim_f) {
 757                 /* There was a victim. Kill it off nicely */
 758                 new_dentry->d_inode->i_nlink--;
 759                 /* Don't oops if the victim was a dirent pointing to an
 760                    inode which didn't exist. */
 761                 if (victim_f->inocache) {
 762                         down(&victim_f->sem);
 763                         victim_f->inocache->nlink--;
 764                         up(&victim_f->sem);
 765                 }
 766         }
 767
 768         /* If it was a directory we moved, and there was no victim,
 769            increase i_nlink on its new parent */
 770         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 771                 new_dir_i->i_nlink++;
 772
 773         /* Unlink the original */
 774         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 775                       old_dentry->d_name.name, old_dentry->d_name.len, NULL);
 776
 777         /* We don't touch inode->i_nlink */
 778
 779         if (ret) {
 780                 /* Oh shit. We really ought to make a single node which can do both atomically */
 781                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 782                 down(&f->sem);
 783                 old_dentry->d_inode->i_nlink++;
 784                 if (f->inocache)
 785                         f->inocache->nlink++;
 786                 up(&f->sem);
 787
 788                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 789                 /* Might as well let the VFS know */
 790                 d_instantiate(new_dentry, old_dentry->d_inode);
 791                 atomic_inc(&old_dentry->d_inode->i_count);
 792                 return ret;
 793         }
 794
 795         if (S_ISDIR(old_dentry->d_inode->i_mode))
 796                 old_dir_i->i_nlink--;
 797
 798         return 0;
 799 }
 800