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                 ihold(old_dentry->d_inode);
 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 = kmemdup(target, 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         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 380
 381         /* No data here. Only a metadata node, which will be
 382            obsoleted by the first data write
 383         */
 384         f->metadata = fn;
 385         mutex_unlock(&f->sem);
 386
 387         jffs2_complete_reservation(c);
 388
 389         ret = jffs2_init_security(inode, dir_i);
 390         if (ret)
 391                 goto fail;
 392
 393         ret = jffs2_init_acl_post(inode);
 394         if (ret)
 395                 goto fail;
 396
 397         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 398                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 399         if (ret)
 400                 goto fail;
 401
 402         rd = jffs2_alloc_raw_dirent();
 403         if (!rd) {
 404                 /* Argh. Now we treat it like a normal delete */
 405                 jffs2_complete_reservation(c);
 406                 ret = -ENOMEM;
 407                 goto fail;
 408         }
 409
 410         dir_f = JFFS2_INODE_INFO(dir_i);
 411         mutex_lock(&dir_f->sem);
 412
 413         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 414         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 415         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 416         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 417
 418         rd->pino = cpu_to_je32(dir_i->i_ino);
 419         rd->version = cpu_to_je32(++dir_f->highest_version);
 420         rd->ino = cpu_to_je32(inode->i_ino);
 421         rd->mctime = cpu_to_je32(get_seconds());
 422         rd->nsize = namelen;
 423         rd->type = DT_LNK;
 424         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 425         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 426
 427         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 428
 429         if (IS_ERR(fd)) {
 430                 /* dirent failed to write. Delete the inode normally
 431                    as if it were the final unlink() */
 432                 jffs2_complete_reservation(c);
 433                 jffs2_free_raw_dirent(rd);
 434                 mutex_unlock(&dir_f->sem);
 435                 ret = PTR_ERR(fd);
 436                 goto fail;
 437         }
 438
 439         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 440
 441         jffs2_free_raw_dirent(rd);
 442
 443         /* Link the fd into the inode's list, obsoleting an old
 444            one if necessary. */
 445         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 446
 447         mutex_unlock(&dir_f->sem);
 448         jffs2_complete_reservation(c);
 449
 450         d_instantiate(dentry, inode);
 451         unlock_new_inode(inode);
 452         return 0;
 453
 454  fail:
 455         iget_failed(inode);
 456         return ret;
 457 }
 458
 459
 460 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 461 {
 462         struct jffs2_inode_info *f, *dir_f;
 463         struct jffs2_sb_info *c;
 464         struct inode *inode;
 465         struct jffs2_raw_inode *ri;
 466         struct jffs2_raw_dirent *rd;
 467         struct jffs2_full_dnode *fn;
 468         struct jffs2_full_dirent *fd;
 469         int namelen;
 470         uint32_t alloclen;
 471         int ret;
 472
 473         mode |= S_IFDIR;
 474
 475         ri = jffs2_alloc_raw_inode();
 476         if (!ri)
 477                 return -ENOMEM;
 478
 479         c = JFFS2_SB_INFO(dir_i->i_sb);
 480
 481         /* Try to reserve enough space for both node and dirent.
 482          * Just the node will do for now, though
 483          */
 484         namelen = dentry->d_name.len;
 485         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 486                                   JFFS2_SUMMARY_INODE_SIZE);
 487
 488         if (ret) {
 489                 jffs2_free_raw_inode(ri);
 490                 return ret;
 491         }
 492
 493         inode = jffs2_new_inode(dir_i, mode, ri);
 494
 495         if (IS_ERR(inode)) {
 496                 jffs2_free_raw_inode(ri);
 497                 jffs2_complete_reservation(c);
 498                 return PTR_ERR(inode);
 499         }
 500
 501         inode->i_op = &jffs2_dir_inode_operations;
 502         inode->i_fop = &jffs2_dir_operations;
 503
 504         f = JFFS2_INODE_INFO(inode);
 505
 506         /* Directories get nlink 2 at start */
 507         inode->i_nlink = 2;
 508         /* but ic->pino_nlink is the parent ino# */
 509         f->inocache->pino_nlink = dir_i->i_ino;
 510
 511         ri->data_crc = cpu_to_je32(0);
 512         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 513
 514         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 515
 516         jffs2_free_raw_inode(ri);
 517
 518         if (IS_ERR(fn)) {
 519                 /* Eeek. Wave bye bye */
 520                 mutex_unlock(&f->sem);
 521                 jffs2_complete_reservation(c);
 522                 ret = PTR_ERR(fn);
 523                 goto fail;
 524         }
 525         /* No data here. Only a metadata node, which will be
 526            obsoleted by the first data write
 527         */
 528         f->metadata = fn;
 529         mutex_unlock(&f->sem);
 530
 531         jffs2_complete_reservation(c);
 532
 533         ret = jffs2_init_security(inode, dir_i);
 534         if (ret)
 535                 goto fail;
 536
 537         ret = jffs2_init_acl_post(inode);
 538         if (ret)
 539                 goto fail;
 540
 541         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 542                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 543         if (ret)
 544                 goto fail;
 545
 546         rd = jffs2_alloc_raw_dirent();
 547         if (!rd) {
 548                 /* Argh. Now we treat it like a normal delete */
 549                 jffs2_complete_reservation(c);
 550                 ret = -ENOMEM;
 551                 goto fail;
 552         }
 553
 554         dir_f = JFFS2_INODE_INFO(dir_i);
 555         mutex_lock(&dir_f->sem);
 556
 557         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 558         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 559         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 560         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 561
 562         rd->pino = cpu_to_je32(dir_i->i_ino);
 563         rd->version = cpu_to_je32(++dir_f->highest_version);
 564         rd->ino = cpu_to_je32(inode->i_ino);
 565         rd->mctime = cpu_to_je32(get_seconds());
 566         rd->nsize = namelen;
 567         rd->type = DT_DIR;
 568         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 569         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 570
 571         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 572
 573         if (IS_ERR(fd)) {
 574                 /* dirent failed to write. Delete the inode normally
 575                    as if it were the final unlink() */
 576                 jffs2_complete_reservation(c);
 577                 jffs2_free_raw_dirent(rd);
 578                 mutex_unlock(&dir_f->sem);
 579                 ret = PTR_ERR(fd);
 580                 goto fail;
 581         }
 582
 583         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 584         inc_nlink(dir_i);
 585
 586         jffs2_free_raw_dirent(rd);
 587
 588         /* Link the fd into the inode's list, obsoleting an old
 589            one if necessary. */
 590         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 591
 592         mutex_unlock(&dir_f->sem);
 593         jffs2_complete_reservation(c);
 594
 595         d_instantiate(dentry, inode);
 596         unlock_new_inode(inode);
 597         return 0;
 598
 599  fail:
 600         iget_failed(inode);
 601         return ret;
 602 }
 603
 604 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 605 {
 606         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 607         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 608         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 609         struct jffs2_full_dirent *fd;
 610         int ret;
 611         uint32_t now = get_seconds();
 612
 613         for (fd = f->dents ; fd; fd = fd->next) {
 614                 if (fd->ino)
 615                         return -ENOTEMPTY;
 616         }
 617
 618         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 619                               dentry->d_name.len, f, now);
 620         if (!ret) {
 621                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 622                 clear_nlink(dentry->d_inode);
 623                 drop_nlink(dir_i);
 624         }
 625         return ret;
 626 }
 627
 628 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 629 {
 630         struct jffs2_inode_info *f, *dir_f;
 631         struct jffs2_sb_info *c;
 632         struct inode *inode;
 633         struct jffs2_raw_inode *ri;
 634         struct jffs2_raw_dirent *rd;
 635         struct jffs2_full_dnode *fn;
 636         struct jffs2_full_dirent *fd;
 637         int namelen;
 638         union jffs2_device_node dev;
 639         int devlen = 0;
 640         uint32_t alloclen;
 641         int ret;
 642
 643         if (!new_valid_dev(rdev))
 644                 return -EINVAL;
 645
 646         ri = jffs2_alloc_raw_inode();
 647         if (!ri)
 648                 return -ENOMEM;
 649
 650         c = JFFS2_SB_INFO(dir_i->i_sb);
 651
 652         if (S_ISBLK(mode) || S_ISCHR(mode))
 653                 devlen = jffs2_encode_dev(&dev, rdev);
 654
 655         /* Try to reserve enough space for both node and dirent.
 656          * Just the node will do for now, though
 657          */
 658         namelen = dentry->d_name.len;
 659         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 660                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 661
 662         if (ret) {
 663                 jffs2_free_raw_inode(ri);
 664                 return ret;
 665         }
 666
 667         inode = jffs2_new_inode(dir_i, mode, ri);
 668
 669         if (IS_ERR(inode)) {
 670                 jffs2_free_raw_inode(ri);
 671                 jffs2_complete_reservation(c);
 672                 return PTR_ERR(inode);
 673         }
 674         inode->i_op = &jffs2_file_inode_operations;
 675         init_special_inode(inode, inode->i_mode, rdev);
 676
 677         f = JFFS2_INODE_INFO(inode);
 678
 679         ri->dsize = ri->csize = cpu_to_je32(devlen);
 680         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 681         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 682
 683         ri->compr = JFFS2_COMPR_NONE;
 684         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 685         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 686
 687         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 688
 689         jffs2_free_raw_inode(ri);
 690
 691         if (IS_ERR(fn)) {
 692                 /* Eeek. Wave bye bye */
 693                 mutex_unlock(&f->sem);
 694                 jffs2_complete_reservation(c);
 695                 ret = PTR_ERR(fn);
 696                 goto fail;
 697         }
 698         /* No data here. Only a metadata node, which will be
 699            obsoleted by the first data write
 700         */
 701         f->metadata = fn;
 702         mutex_unlock(&f->sem);
 703
 704         jffs2_complete_reservation(c);
 705
 706         ret = jffs2_init_security(inode, dir_i);
 707         if (ret)
 708                 goto fail;
 709
 710         ret = jffs2_init_acl_post(inode);
 711         if (ret)
 712                 goto fail;
 713
 714         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 715                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 716         if (ret)
 717                 goto fail;
 718
 719         rd = jffs2_alloc_raw_dirent();
 720         if (!rd) {
 721                 /* Argh. Now we treat it like a normal delete */
 722                 jffs2_complete_reservation(c);
 723                 ret = -ENOMEM;
 724                 goto fail;
 725         }
 726
 727         dir_f = JFFS2_INODE_INFO(dir_i);
 728         mutex_lock(&dir_f->sem);
 729
 730         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 731         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 732         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 733         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 734
 735         rd->pino = cpu_to_je32(dir_i->i_ino);
 736         rd->version = cpu_to_je32(++dir_f->highest_version);
 737         rd->ino = cpu_to_je32(inode->i_ino);
 738         rd->mctime = cpu_to_je32(get_seconds());
 739         rd->nsize = namelen;
 740
 741         /* XXX: This is ugly. */
 742         rd->type = (mode & S_IFMT) >> 12;
 743
 744         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 745         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 746
 747         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 748
 749         if (IS_ERR(fd)) {
 750                 /* dirent failed to write. Delete the inode normally
 751                    as if it were the final unlink() */
 752                 jffs2_complete_reservation(c);
 753                 jffs2_free_raw_dirent(rd);
 754                 mutex_unlock(&dir_f->sem);
 755                 ret = PTR_ERR(fd);
 756                 goto fail;
 757         }
 758
 759         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 760
 761         jffs2_free_raw_dirent(rd);
 762
 763         /* Link the fd into the inode's list, obsoleting an old
 764            one if necessary. */
 765         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 766
 767         mutex_unlock(&dir_f->sem);
 768         jffs2_complete_reservation(c);
 769
 770         d_instantiate(dentry, inode);
 771         unlock_new_inode(inode);
 772         return 0;
 773
 774  fail:
 775         iget_failed(inode);
 776         return ret;
 777 }
 778
 779 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 780                          struct inode *new_dir_i, struct dentry *new_dentry)
 781 {
 782         int ret;
 783         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 784         struct jffs2_inode_info *victim_f = NULL;
 785         uint8_t type;
 786         uint32_t now;
 787
 788         /* The VFS will check for us and prevent trying to rename a
 789          * file over a directory and vice versa, but if it's a directory,
 790          * the VFS can't check whether the victim is empty. The filesystem
 791          * needs to do that for itself.
 792          */
 793         if (new_dentry->d_inode) {
 794                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 795                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 796                         struct jffs2_full_dirent *fd;
 797
 798                         mutex_lock(&victim_f->sem);
 799                         for (fd = victim_f->dents; fd; fd = fd->next) {
 800                                 if (fd->ino) {
 801                                         mutex_unlock(&victim_f->sem);
 802                                         return -ENOTEMPTY;
 803                                 }
 804                         }
 805                         mutex_unlock(&victim_f->sem);
 806                 }
 807         }
 808
 809         /* XXX: We probably ought to alloc enough space for
 810            both nodes at the same time. Writing the new link,
 811            then getting -ENOSPC, is quite bad :)
 812         */
 813
 814         /* Make a hard link */
 815
 816         /* XXX: This is ugly */
 817         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 818         if (!type) type = DT_REG;
 819
 820         now = get_seconds();
 821         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 822                             old_dentry->d_inode->i_ino, type,
 823                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 824
 825         if (ret)
 826                 return ret;
 827
 828         if (victim_f) {
 829                 /* There was a victim. Kill it off nicely */
 830                 drop_nlink(new_dentry->d_inode);
 831                 /* Don't oops if the victim was a dirent pointing to an
 832                    inode which didn't exist. */
 833                 if (victim_f->inocache) {
 834                         mutex_lock(&victim_f->sem);
 835                         if (S_ISDIR(new_dentry->d_inode->i_mode))
 836                                 victim_f->inocache->pino_nlink = 0;
 837                         else
 838                                 victim_f->inocache->pino_nlink--;
 839                         mutex_unlock(&victim_f->sem);
 840                 }
 841         }
 842
 843         /* If it was a directory we moved, and there was no victim,
 844            increase i_nlink on its new parent */
 845         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 846                 inc_nlink(new_dir_i);
 847
 848         /* Unlink the original */
 849         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 850                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 851
 852         /* We don't touch inode->i_nlink */
 853
 854         if (ret) {
 855                 /* Oh shit. We really ought to make a single node which can do both atomically */
 856                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 857                 mutex_lock(&f->sem);
 858                 inc_nlink(old_dentry->d_inode);
 859                 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
 860                         f->inocache->pino_nlink++;
 861                 mutex_unlock(&f->sem);
 862
 863                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 864                 /* Might as well let the VFS know */
 865                 d_instantiate(new_dentry, old_dentry->d_inode);
 866                 ihold(old_dentry->d_inode);
 867                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 868                 return ret;
 869         }
 870
 871         if (S_ISDIR(old_dentry->d_inode->i_mode))
 872                 drop_nlink(old_dir_i);
 873
 874         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 875
 876         return 0;
 877 }
 878