fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
   6  *
   7  * Created by David Woodhouse <dwmw2@infradead.org>
   8  *
   9  * For licensing information, see the file 'LICENCE' in this directory.
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/slab.h>
  15 #include <linux/fs.h>
  16 #include <linux/crc32.h>
  17 #include <linux/jffs2.h>
  18 #include "jffs2_fs_i.h"
  19 #include "jffs2_fs_sb.h"
  20 #include <linux/time.h>
  21 #include "nodelist.h"
  22
  23 static int jffs2_readdir (struct file *, void *, filldir_t);
  24
  25 static int jffs2_create (struct inode *,struct dentry *,int,
  26                          struct nameidata *);
  27 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  28                                     struct nameidata *);
  29 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  30 static int jffs2_unlink (struct inode *,struct dentry *);
  31 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  32 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  33 static int jffs2_rmdir (struct inode *,struct dentry *);
  34 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
  35 static int jffs2_rename (struct inode *, struct dentry *,
  36                          struct inode *, struct dentry *);
  37
  38 const struct file_operations jffs2_dir_operations =
  39 {
  40         .read =         generic_read_dir,
  41         .readdir =      jffs2_readdir,
  42         .unlocked_ioctl=jffs2_ioctl,
  43         .fsync =        jffs2_fsync,
  44         .llseek =       generic_file_llseek,
  45 };
  46
  47
  48 const struct inode_operations jffs2_dir_inode_operations =
  49 {
  50         .create =       jffs2_create,
  51         .lookup =       jffs2_lookup,
  52         .link =         jffs2_link,
  53         .unlink =       jffs2_unlink,
  54         .symlink =      jffs2_symlink,
  55         .mkdir =        jffs2_mkdir,
  56         .rmdir =        jffs2_rmdir,
  57         .mknod =        jffs2_mknod,
  58         .rename =       jffs2_rename,
  59         .check_acl =    jffs2_check_acl,
  60         .setattr =      jffs2_setattr,
  61         .setxattr =     jffs2_setxattr,
  62         .getxattr =     jffs2_getxattr,
  63         .listxattr =    jffs2_listxattr,
  64         .removexattr =  jffs2_removexattr
  65 };
  66
  67 /***********************************************************************/
  68
  69
  70 /* We keep the dirent list sorted in increasing order of name hash,
  71    and we use the same hash function as the dentries. Makes this
  72    nice and simple
  73 */
  74 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  75                                    struct nameidata *nd)
  76 {
  77         struct jffs2_inode_info *dir_f;
  78         struct jffs2_sb_info *c;
  79         struct jffs2_full_dirent *fd = NULL, *fd_list;
  80         uint32_t ino = 0;
  81         struct inode *inode = NULL;
  82
  83         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
  84
  85         if (target->d_name.len > JFFS2_MAX_NAME_LEN)
  86                 return ERR_PTR(-ENAMETOOLONG);
  87
  88         dir_f = JFFS2_INODE_INFO(dir_i);
  89         c = JFFS2_SB_INFO(dir_i->i_sb);
  90
  91         mutex_lock(&dir_f->sem);
  92
  93         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  94         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  95                 if (fd_list->nhash == target->d_name.hash &&
  96                     (!fd || fd_list->version > fd->version) &&
  97                     strlen(fd_list->name) == target->d_name.len &&
  98                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  99                         fd = fd_list;
 100                 }
 101         }
 102         if (fd)
 103                 ino = fd->ino;
 104         mutex_unlock(&dir_f->sem);
 105         if (ino) {
 106                 inode = jffs2_iget(dir_i->i_sb, ino);
 107                 if (IS_ERR(inode)) {
 108                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 109                         return ERR_CAST(inode);
 110                 }
 111         }
 112
 113         return d_splice_alias(inode, target);
 114 }
 115
 116 /***********************************************************************/
 117
 118
 119 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 120 {
 121         struct jffs2_inode_info *f;
 122         struct jffs2_sb_info *c;
 123         struct inode *inode = filp->f_path.dentry->d_inode;
 124         struct jffs2_full_dirent *fd;
 125         unsigned long offset, curofs;
 126
 127         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
 128
 129         f = JFFS2_INODE_INFO(inode);
 130         c = JFFS2_SB_INFO(inode->i_sb);
 131
 132         offset = filp->f_pos;
 133
 134         if (offset == 0) {
 135                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 136                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 137                         goto out;
 138                 offset++;
 139         }
 140         if (offset == 1) {
 141                 unsigned long pino = parent_ino(filp->f_path.dentry);
 142                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 143                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 144                         goto out;
 145                 offset++;
 146         }
 147
 148         curofs=1;
 149         mutex_lock(&f->sem);
 150         for (fd = f->dents; fd; fd = fd->next) {
 151
 152                 curofs++;
 153                 /* First loop: curofs = 2; offset = 2 */
 154                 if (curofs < offset) {
 155                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 156                                   fd->name, fd->ino, fd->type, curofs, offset));
 157                         continue;
 158                 }
 159                 if (!fd->ino) {
 160                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 161                         offset++;
 162                         continue;
 163                 }
 164                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 165                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 166                         break;
 167                 offset++;
 168         }
 169         mutex_unlock(&f->sem);
 170  out:
 171         filp->f_pos = offset;
 172         return 0;
 173 }
 174
 175 /***********************************************************************/
 176
 177
 178 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 179                         struct nameidata *nd)
 180 {
 181         struct jffs2_raw_inode *ri;
 182         struct jffs2_inode_info *f, *dir_f;
 183         struct jffs2_sb_info *c;
 184         struct inode *inode;
 185         int ret;
 186
 187         ri = jffs2_alloc_raw_inode();
 188         if (!ri)
 189                 return -ENOMEM;
 190
 191         c = JFFS2_SB_INFO(dir_i->i_sb);
 192
 193         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 194
 195         inode = jffs2_new_inode(dir_i, mode, ri);
 196
 197         if (IS_ERR(inode)) {
 198                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 199                 jffs2_free_raw_inode(ri);
 200                 return PTR_ERR(inode);
 201         }
 202
 203         inode->i_op = &jffs2_file_inode_operations;
 204         inode->i_fop = &jffs2_file_operations;
 205         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 206         inode->i_mapping->nrpages = 0;
 207
 208         f = JFFS2_INODE_INFO(inode);
 209         dir_f = JFFS2_INODE_INFO(dir_i);
 210
 211         /* jffs2_do_create() will want to lock it, _after_ reserving
 212            space and taking c-alloc_sem. If we keep it locked here,
 213            lockdep gets unhappy (although it's a false positive;
 214            nothing else will be looking at this inode yet so there's
 215            no chance of AB-BA deadlock involving its f->sem). */
 216         mutex_unlock(&f->sem);
 217
 218         ret = jffs2_do_create(c, dir_f, f, ri,
 219                               dentry->d_name.name, dentry->d_name.len);
 220         if (ret)
 221                 goto fail;
 222
 223         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 224
 225         jffs2_free_raw_inode(ri);
 226
 227         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 228                   inode->i_ino, inode->i_mode, inode->i_nlink,
 229                   f->inocache->pino_nlink, inode->i_mapping->nrpages));
 230
 231         d_instantiate(dentry, inode);
 232         unlock_new_inode(inode);
 233         return 0;
 234
 235  fail:
 236         iget_failed(inode);
 237         jffs2_free_raw_inode(ri);
 238         return ret;
 239 }
 240
 241 /***********************************************************************/
 242
 243
 244 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 245 {
 246         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 247         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 248         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 249         int ret;
 250         uint32_t now = get_seconds();
 251
 252         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 253                               dentry->d_name.len, dead_f, now);
 254         if (dead_f->inocache)
 255                 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
 256         if (!ret)
 257                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 258         return ret;
 259 }
 260 /***********************************************************************/
 261
 262
 263 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 264 {
 265         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 266         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 267         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 268         int ret;
 269         uint8_t type;
 270         uint32_t now;
 271
 272         /* Don't let people make hard links to bad inodes. */
 273         if (!f->inocache)
 274                 return -EIO;
 275
 276         if (S_ISDIR(old_dentry->d_inode->i_mode))
 277                 return -EPERM;
 278
 279         /* XXX: This is ugly */
 280         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 281         if (!type) type = DT_REG;
 282
 283         now = get_seconds();
 284         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 285
 286         if (!ret) {
 287                 mutex_lock(&f->sem);
 288                 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
 289                 mutex_unlock(&f->sem);
 290                 d_instantiate(dentry, old_dentry->d_inode);
 291                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 292                 atomic_inc(&old_dentry->d_inode->i_count);
 293         }
 294         return ret;
 295 }
 296
 297 /***********************************************************************/
 298
 299 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 300 {
 301         struct jffs2_inode_info *f, *dir_f;
 302         struct jffs2_sb_info *c;
 303         struct inode *inode;
 304         struct jffs2_raw_inode *ri;
 305         struct jffs2_raw_dirent *rd;
 306         struct jffs2_full_dnode *fn;
 307         struct jffs2_full_dirent *fd;
 308         int namelen;
 309         uint32_t alloclen;
 310         int ret, targetlen = strlen(target);
 311
 312         /* FIXME: If you care. We'd need to use frags for the target
 313            if it grows much more than this */
 314         if (targetlen > 254)
 315                 return -ENAMETOOLONG;
 316
 317         ri = jffs2_alloc_raw_inode();
 318
 319         if (!ri)
 320                 return -ENOMEM;
 321
 322         c = JFFS2_SB_INFO(dir_i->i_sb);
 323
 324         /* Try to reserve enough space for both node and dirent.
 325          * Just the node will do for now, though
 326          */
 327         namelen = dentry->d_name.len;
 328         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 329                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 330
 331         if (ret) {
 332                 jffs2_free_raw_inode(ri);
 333                 return ret;
 334         }
 335
 336         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 337
 338         if (IS_ERR(inode)) {
 339                 jffs2_free_raw_inode(ri);
 340                 jffs2_complete_reservation(c);
 341                 return PTR_ERR(inode);
 342         }
 343
 344         inode->i_op = &jffs2_symlink_inode_operations;
 345
 346         f = JFFS2_INODE_INFO(inode);
 347
 348         inode->i_size = targetlen;
 349         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 350         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 351         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 352
 353         ri->compr = JFFS2_COMPR_NONE;
 354         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 355         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 356
 357         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 358
 359         jffs2_free_raw_inode(ri);
 360
 361         if (IS_ERR(fn)) {
 362                 /* Eeek. Wave bye bye */
 363                 mutex_unlock(&f->sem);
 364                 jffs2_complete_reservation(c);
 365                 ret = PTR_ERR(fn);
 366                 goto fail;
 367         }
 368
 369         /* We use f->target field to store the target path. */
 370         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 371         if (!f->target) {
 372                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 373                 mutex_unlock(&f->sem);
 374                 jffs2_complete_reservation(c);
 375                 ret = -ENOMEM;
 376                 goto fail;
 377         }
 378
 379         memcpy(f->target, target, targetlen + 1);
 380         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 381
 382         /* No data here. Only a metadata node, which will be
 383            obsoleted by the first data write
 384         */
 385         f->metadata = fn;
 386         mutex_unlock(&f->sem);
 387
 388         jffs2_complete_reservation(c);
 389
 390         ret = jffs2_init_security(inode, dir_i);
 391         if (ret)
 392                 goto fail;
 393
 394         ret = jffs2_init_acl_post(inode);
 395         if (ret)
 396                 goto fail;
 397
 398         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 399                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 400         if (ret)
 401                 goto fail;
 402
 403         rd = jffs2_alloc_raw_dirent();
 404         if (!rd) {
 405                 /* Argh. Now we treat it like a normal delete */
 406                 jffs2_complete_reservation(c);
 407                 ret = -ENOMEM;
 408                 goto fail;
 409         }
 410
 411         dir_f = JFFS2_INODE_INFO(dir_i);
 412         mutex_lock(&dir_f->sem);
 413
 414         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 415         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 416         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 417         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 418
 419         rd->pino = cpu_to_je32(dir_i->i_ino);
 420         rd->version = cpu_to_je32(++dir_f->highest_version);
 421         rd->ino = cpu_to_je32(inode->i_ino);
 422         rd->mctime = cpu_to_je32(get_seconds());
 423         rd->nsize = namelen;
 424         rd->type = DT_LNK;
 425         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 426         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 427
 428         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 429
 430         if (IS_ERR(fd)) {
 431                 /* dirent failed to write. Delete the inode normally
 432                    as if it were the final unlink() */
 433                 jffs2_complete_reservation(c);
 434                 jffs2_free_raw_dirent(rd);
 435                 mutex_unlock(&dir_f->sem);
 436                 ret = PTR_ERR(fd);
 437                 goto fail;
 438         }
 439
 440         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 441
 442         jffs2_free_raw_dirent(rd);
 443
 444         /* Link the fd into the inode's list, obsoleting an old
 445            one if necessary. */
 446         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 447
 448         mutex_unlock(&dir_f->sem);
 449         jffs2_complete_reservation(c);
 450
 451         d_instantiate(dentry, inode);
 452         unlock_new_inode(inode);
 453         return 0;
 454
 455  fail:
 456         iget_failed(inode);
 457         return ret;
 458 }
 459
 460
 461 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 462 {
 463         struct jffs2_inode_info *f, *dir_f;
 464         struct jffs2_sb_info *c;
 465         struct inode *inode;
 466         struct jffs2_raw_inode *ri;
 467         struct jffs2_raw_dirent *rd;
 468         struct jffs2_full_dnode *fn;
 469         struct jffs2_full_dirent *fd;
 470         int namelen;
 471         uint32_t alloclen;
 472         int ret;
 473
 474         mode |= S_IFDIR;
 475
 476         ri = jffs2_alloc_raw_inode();
 477         if (!ri)
 478                 return -ENOMEM;
 479
 480         c = JFFS2_SB_INFO(dir_i->i_sb);
 481
 482         /* Try to reserve enough space for both node and dirent.
 483          * Just the node will do for now, though
 484          */
 485         namelen = dentry->d_name.len;
 486         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 487                                   JFFS2_SUMMARY_INODE_SIZE);
 488
 489         if (ret) {
 490                 jffs2_free_raw_inode(ri);
 491                 return ret;
 492         }
 493
 494         inode = jffs2_new_inode(dir_i, mode, ri);
 495
 496         if (IS_ERR(inode)) {
 497                 jffs2_free_raw_inode(ri);
 498                 jffs2_complete_reservation(c);
 499                 return PTR_ERR(inode);
 500         }
 501
 502         inode->i_op = &jffs2_dir_inode_operations;
 503         inode->i_fop = &jffs2_dir_operations;
 504
 505         f = JFFS2_INODE_INFO(inode);
 506
 507         /* Directories get nlink 2 at start */
 508         inode->i_nlink = 2;
 509         /* but ic->pino_nlink is the parent ino# */
 510         f->inocache->pino_nlink = dir_i->i_ino;
 511
 512         ri->data_crc = cpu_to_je32(0);
 513         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 514
 515         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 516
 517         jffs2_free_raw_inode(ri);
 518
 519         if (IS_ERR(fn)) {
 520                 /* Eeek. Wave bye bye */
 521                 mutex_unlock(&f->sem);
 522                 jffs2_complete_reservation(c);
 523                 ret = PTR_ERR(fn);
 524                 goto fail;
 525         }
 526         /* No data here. Only a metadata node, which will be
 527            obsoleted by the first data write
 528         */
 529         f->metadata = fn;
 530         mutex_unlock(&f->sem);
 531
 532         jffs2_complete_reservation(c);
 533
 534         ret = jffs2_init_security(inode, dir_i);
 535         if (ret)
 536                 goto fail;
 537
 538         ret = jffs2_init_acl_post(inode);
 539         if (ret)
 540                 goto fail;
 541
 542         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 543                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 544         if (ret)
 545                 goto fail;
 546
 547         rd = jffs2_alloc_raw_dirent();
 548         if (!rd) {
 549                 /* Argh. Now we treat it like a normal delete */
 550                 jffs2_complete_reservation(c);
 551                 ret = -ENOMEM;
 552                 goto fail;
 553         }
 554
 555         dir_f = JFFS2_INODE_INFO(dir_i);
 556         mutex_lock(&dir_f->sem);
 557
 558         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 559         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 560         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 561         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 562
 563         rd->pino = cpu_to_je32(dir_i->i_ino);
 564         rd->version = cpu_to_je32(++dir_f->highest_version);
 565         rd->ino = cpu_to_je32(inode->i_ino);
 566         rd->mctime = cpu_to_je32(get_seconds());
 567         rd->nsize = namelen;
 568         rd->type = DT_DIR;
 569         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 570         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 571
 572         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 573
 574         if (IS_ERR(fd)) {
 575                 /* dirent failed to write. Delete the inode normally
 576                    as if it were the final unlink() */
 577                 jffs2_complete_reservation(c);
 578                 jffs2_free_raw_dirent(rd);
 579                 mutex_unlock(&dir_f->sem);
 580                 ret = PTR_ERR(fd);
 581                 goto fail;
 582         }
 583
 584         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 585         inc_nlink(dir_i);
 586
 587         jffs2_free_raw_dirent(rd);
 588
 589         /* Link the fd into the inode's list, obsoleting an old
 590            one if necessary. */
 591         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 592
 593         mutex_unlock(&dir_f->sem);
 594         jffs2_complete_reservation(c);
 595
 596         d_instantiate(dentry, inode);
 597         unlock_new_inode(inode);
 598         return 0;
 599
 600  fail:
 601         iget_failed(inode);
 602         return ret;
 603 }
 604
 605 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 606 {
 607         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 608         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 609         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 610         struct jffs2_full_dirent *fd;
 611         int ret;
 612         uint32_t now = get_seconds();
 613
 614         for (fd = f->dents ; fd; fd = fd->next) {
 615                 if (fd->ino)
 616                         return -ENOTEMPTY;
 617         }
 618
 619         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 620                               dentry->d_name.len, f, now);
 621         if (!ret) {
 622                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 623                 clear_nlink(dentry->d_inode);
 624                 drop_nlink(dir_i);
 625         }
 626         return ret;
 627 }
 628
 629 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 630 {
 631         struct jffs2_inode_info *f, *dir_f;
 632         struct jffs2_sb_info *c;
 633         struct inode *inode;
 634         struct jffs2_raw_inode *ri;
 635         struct jffs2_raw_dirent *rd;
 636         struct jffs2_full_dnode *fn;
 637         struct jffs2_full_dirent *fd;
 638         int namelen;
 639         union jffs2_device_node dev;
 640         int devlen = 0;
 641         uint32_t alloclen;
 642         int ret;
 643
 644         if (!new_valid_dev(rdev))
 645                 return -EINVAL;
 646
 647         ri = jffs2_alloc_raw_inode();
 648         if (!ri)
 649                 return -ENOMEM;
 650
 651         c = JFFS2_SB_INFO(dir_i->i_sb);
 652
 653         if (S_ISBLK(mode) || S_ISCHR(mode))
 654                 devlen = jffs2_encode_dev(&dev, rdev);
 655
 656         /* Try to reserve enough space for both node and dirent.
 657          * Just the node will do for now, though
 658          */
 659         namelen = dentry->d_name.len;
 660         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 661                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 662
 663         if (ret) {
 664                 jffs2_free_raw_inode(ri);
 665                 return ret;
 666         }
 667
 668         inode = jffs2_new_inode(dir_i, mode, ri);
 669
 670         if (IS_ERR(inode)) {
 671                 jffs2_free_raw_inode(ri);
 672                 jffs2_complete_reservation(c);
 673                 return PTR_ERR(inode);
 674         }
 675         inode->i_op = &jffs2_file_inode_operations;
 676         init_special_inode(inode, inode->i_mode, rdev);
 677
 678         f = JFFS2_INODE_INFO(inode);
 679
 680         ri->dsize = ri->csize = cpu_to_je32(devlen);
 681         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 682         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 683
 684         ri->compr = JFFS2_COMPR_NONE;
 685         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 686         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 687
 688         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 689
 690         jffs2_free_raw_inode(ri);
 691
 692         if (IS_ERR(fn)) {
 693                 /* Eeek. Wave bye bye */
 694                 mutex_unlock(&f->sem);
 695                 jffs2_complete_reservation(c);
 696                 ret = PTR_ERR(fn);
 697                 goto fail;
 698         }
 699         /* No data here. Only a metadata node, which will be
 700            obsoleted by the first data write
 701         */
 702         f->metadata = fn;
 703         mutex_unlock(&f->sem);
 704
 705         jffs2_complete_reservation(c);
 706
 707         ret = jffs2_init_security(inode, dir_i);
 708         if (ret)
 709                 goto fail;
 710
 711         ret = jffs2_init_acl_post(inode);
 712         if (ret)
 713                 goto fail;
 714
 715         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 716                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 717         if (ret)
 718                 goto fail;
 719
 720         rd = jffs2_alloc_raw_dirent();
 721         if (!rd) {
 722                 /* Argh. Now we treat it like a normal delete */
 723                 jffs2_complete_reservation(c);
 724                 ret = -ENOMEM;
 725                 goto fail;
 726         }
 727
 728         dir_f = JFFS2_INODE_INFO(dir_i);
 729         mutex_lock(&dir_f->sem);
 730
 731         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 732         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 733         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 734         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 735
 736         rd->pino = cpu_to_je32(dir_i->i_ino);
 737         rd->version = cpu_to_je32(++dir_f->highest_version);
 738         rd->ino = cpu_to_je32(inode->i_ino);
 739         rd->mctime = cpu_to_je32(get_seconds());
 740         rd->nsize = namelen;
 741
 742         /* XXX: This is ugly. */
 743         rd->type = (mode & S_IFMT) >> 12;
 744
 745         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 746         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 747
 748         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 749
 750         if (IS_ERR(fd)) {
 751                 /* dirent failed to write. Delete the inode normally
 752                    as if it were the final unlink() */
 753                 jffs2_complete_reservation(c);
 754                 jffs2_free_raw_dirent(rd);
 755                 mutex_unlock(&dir_f->sem);
 756                 ret = PTR_ERR(fd);
 757                 goto fail;
 758         }
 759
 760         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 761
 762         jffs2_free_raw_dirent(rd);
 763
 764         /* Link the fd into the inode's list, obsoleting an old
 765            one if necessary. */
 766         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 767
 768         mutex_unlock(&dir_f->sem);
 769         jffs2_complete_reservation(c);
 770
 771         d_instantiate(dentry, inode);
 772         unlock_new_inode(inode);
 773         return 0;
 774
 775  fail:
 776         iget_failed(inode);
 777         return ret;
 778 }
 779
 780 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 781                          struct inode *new_dir_i, struct dentry *new_dentry)
 782 {
 783         int ret;
 784         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 785         struct jffs2_inode_info *victim_f = NULL;
 786         uint8_t type;
 787         uint32_t now;
 788
 789         /* The VFS will check for us and prevent trying to rename a
 790          * file over a directory and vice versa, but if it's a directory,
 791          * the VFS can't check whether the victim is empty. The filesystem
 792          * needs to do that for itself.
 793          */
 794         if (new_dentry->d_inode) {
 795                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 796                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 797                         struct jffs2_full_dirent *fd;
 798
 799                         mutex_lock(&victim_f->sem);
 800                         for (fd = victim_f->dents; fd; fd = fd->next) {
 801                                 if (fd->ino) {
 802                                         mutex_unlock(&victim_f->sem);
 803                                         return -ENOTEMPTY;
 804                                 }
 805                         }
 806                         mutex_unlock(&victim_f->sem);
 807                 }
 808         }
 809
 810         /* XXX: We probably ought to alloc enough space for
 811            both nodes at the same time. Writing the new link,
 812            then getting -ENOSPC, is quite bad :)
 813         */
 814
 815         /* Make a hard link */
 816
 817         /* XXX: This is ugly */
 818         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 819         if (!type) type = DT_REG;
 820
 821         now = get_seconds();
 822         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 823                             old_dentry->d_inode->i_ino, type,
 824                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 825
 826         if (ret)
 827                 return ret;
 828
 829         if (victim_f) {
 830                 /* There was a victim. Kill it off nicely */
 831                 drop_nlink(new_dentry->d_inode);
 832                 /* Don't oops if the victim was a dirent pointing to an
 833                    inode which didn't exist. */
 834                 if (victim_f->inocache) {
 835                         mutex_lock(&victim_f->sem);
 836                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 837                                 victim_f->inocache->pino_nlink = 0;
 838                         else
 839                                 victim_f->inocache->pino_nlink--;
 840                         mutex_unlock(&victim_f->sem);
 841                 }
 842         }
 843
 844         /* If it was a directory we moved, and there was no victim,
 845            increase i_nlink on its new parent */
 846         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 847                 inc_nlink(new_dir_i);
 848
 849         /* Unlink the original */
 850         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 851                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 852
 853         /* We don't touch inode->i_nlink */
 854
 855         if (ret) {
 856                 /* Oh shit. We really ought to make a single node which can do both atomically */
 857                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 858                 mutex_lock(&f->sem);
 859                 inc_nlink(old_dentry->d_inode);
 860                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 861                         f->inocache->pino_nlink++;
 862                 mutex_unlock(&f->sem);
 863
 864                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 865                 /* Might as well let the VFS know */
 866                 d_instantiate(new_dentry, old_dentry->d_inode);
 867                 atomic_inc(&old_dentry->d_inode->i_count);
 868                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 869                 return ret;
 870         }
 871
 872         if (S_ISDIR(old_dentry->d_inode->i_mode))
 873                 drop_nlink(old_dir_i);
 874
 875         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 876
 877         return 0;
 878 }
 879