fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright © 2001-2007 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/slab.h>
  14 #include <linux/fs.h>
  15 #include <linux/crc32.h>
  16 #include <linux/jffs2.h>
  17 #include "jffs2_fs_i.h"
  18 #include "jffs2_fs_sb.h"
  19 #include <linux/time.h>
  20 #include "nodelist.h"
  21
  22 static int jffs2_readdir (struct file *, void *, filldir_t);
  23
  24 static int jffs2_create (struct inode *,struct dentry *,int,
  25                          struct nameidata *);
  26 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  27                                     struct nameidata *);
  28 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  29 static int jffs2_unlink (struct inode *,struct dentry *);
  30 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  31 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  32 static int jffs2_rmdir (struct inode *,struct dentry *);
  33 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
  34 static int jffs2_rename (struct inode *, struct dentry *,
  35                          struct inode *, struct dentry *);
  36
  37 const struct file_operations jffs2_dir_operations =
  38 {
  39         .read =         generic_read_dir,
  40         .readdir =      jffs2_readdir,
  41         .ioctl =        jffs2_ioctl,
  42         .fsync =        jffs2_fsync
  43 };
  44
  45
  46 const struct inode_operations jffs2_dir_inode_operations =
  47 {
  48         .create =       jffs2_create,
  49         .lookup =       jffs2_lookup,
  50         .link =         jffs2_link,
  51         .unlink =       jffs2_unlink,
  52         .symlink =      jffs2_symlink,
  53         .mkdir =        jffs2_mkdir,
  54         .rmdir =        jffs2_rmdir,
  55         .mknod =        jffs2_mknod,
  56         .rename =       jffs2_rename,
  57         .permission =   jffs2_permission,
  58         .setattr =      jffs2_setattr,
  59         .setxattr =     jffs2_setxattr,
  60         .getxattr =     jffs2_getxattr,
  61         .listxattr =    jffs2_listxattr,
  62         .removexattr =  jffs2_removexattr
  63 };
  64
  65 /***********************************************************************/
  66
  67
  68 /* We keep the dirent list sorted in increasing order of name hash,
  69    and we use the same hash function as the dentries. Makes this
  70    nice and simple
  71 */
  72 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  73                                    struct nameidata *nd)
  74 {
  75         struct jffs2_inode_info *dir_f;
  76         struct jffs2_sb_info *c;
  77         struct jffs2_full_dirent *fd = NULL, *fd_list;
  78         uint32_t ino = 0;
  79         struct inode *inode = NULL;
  80
  81         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
  82
  83         if (target->d_name.len > JFFS2_MAX_NAME_LEN)
  84                 return ERR_PTR(-ENAMETOOLONG);
  85
  86         dir_f = JFFS2_INODE_INFO(dir_i);
  87         c = JFFS2_SB_INFO(dir_i->i_sb);
  88
  89         down(&dir_f->sem);
  90
  91         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  92         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  93                 if (fd_list->nhash == target->d_name.hash &&
  94                     (!fd || fd_list->version > fd->version) &&
  95                     strlen(fd_list->name) == target->d_name.len &&
  96                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  97                         fd = fd_list;
  98                 }
  99         }
 100         if (fd)
 101                 ino = fd->ino;
 102         up(&dir_f->sem);
 103         if (ino) {
 104                 inode = iget(dir_i->i_sb, ino);
 105                 if (!inode) {
 106                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 107                         return (ERR_PTR(-EIO));
 108                 }
 109         }
 110
 111         d_add(target, inode);
 112
 113         return NULL;
 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         down(&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         up(&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         ret = jffs2_do_create(c, dir_f, f, ri,
 212                               dentry->d_name.name, dentry->d_name.len);
 213         if (ret)
 214                 goto fail;
 215
 216         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 217
 218         jffs2_free_raw_inode(ri);
 219         d_instantiate(dentry, inode);
 220
 221         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 222                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 223         return 0;
 224
 225  fail:
 226         make_bad_inode(inode);
 227         iput(inode);
 228         jffs2_free_raw_inode(ri);
 229         return ret;
 230 }
 231
 232 /***********************************************************************/
 233
 234
 235 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 236 {
 237         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 238         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 239         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 240         int ret;
 241         uint32_t now = get_seconds();
 242
 243         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 244                               dentry->d_name.len, dead_f, now);
 245         if (dead_f->inocache)
 246                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 247         if (!ret)
 248                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 249         return ret;
 250 }
 251 /***********************************************************************/
 252
 253
 254 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 255 {
 256         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 257         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 258         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 259         int ret;
 260         uint8_t type;
 261         uint32_t now;
 262
 263         /* Don't let people make hard links to bad inodes. */
 264         if (!f->inocache)
 265                 return -EIO;
 266
 267         if (S_ISDIR(old_dentry->d_inode->i_mode))
 268                 return -EPERM;
 269
 270         /* XXX: This is ugly */
 271         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 272         if (!type) type = DT_REG;
 273
 274         now = get_seconds();
 275         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 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                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 283                 atomic_inc(&old_dentry->d_inode->i_count);
 284         }
 285         return ret;
 286 }
 287
 288 /***********************************************************************/
 289
 290 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 291 {
 292         struct jffs2_inode_info *f, *dir_f;
 293         struct jffs2_sb_info *c;
 294         struct inode *inode;
 295         struct jffs2_raw_inode *ri;
 296         struct jffs2_raw_dirent *rd;
 297         struct jffs2_full_dnode *fn;
 298         struct jffs2_full_dirent *fd;
 299         int namelen;
 300         uint32_t alloclen;
 301         int ret, targetlen = strlen(target);
 302
 303         /* FIXME: If you care. We'd need to use frags for the target
 304            if it grows much more than this */
 305         if (targetlen > 254)
 306                 return -EINVAL;
 307
 308         ri = jffs2_alloc_raw_inode();
 309
 310         if (!ri)
 311                 return -ENOMEM;
 312
 313         c = JFFS2_SB_INFO(dir_i->i_sb);
 314
 315         /* Try to reserve enough space for both node and dirent.
 316          * Just the node will do for now, though
 317          */
 318         namelen = dentry->d_name.len;
 319         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
 320                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 321
 322         if (ret) {
 323                 jffs2_free_raw_inode(ri);
 324                 return ret;
 325         }
 326
 327         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 328
 329         if (IS_ERR(inode)) {
 330                 jffs2_free_raw_inode(ri);
 331                 jffs2_complete_reservation(c);
 332                 return PTR_ERR(inode);
 333         }
 334
 335         inode->i_op = &jffs2_symlink_inode_operations;
 336
 337         f = JFFS2_INODE_INFO(inode);
 338
 339         inode->i_size = targetlen;
 340         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 341         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 342         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 343
 344         ri->compr = JFFS2_COMPR_NONE;
 345         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 346         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 347
 348         fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
 349
 350         jffs2_free_raw_inode(ri);
 351
 352         if (IS_ERR(fn)) {
 353                 /* Eeek. Wave bye bye */
 354                 up(&f->sem);
 355                 jffs2_complete_reservation(c);
 356                 jffs2_clear_inode(inode);
 357                 return PTR_ERR(fn);
 358         }
 359
 360         /* We use f->target field to store the target path. */
 361         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 362         if (!f->target) {
 363                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 364                 up(&f->sem);
 365                 jffs2_complete_reservation(c);
 366                 jffs2_clear_inode(inode);
 367                 return -ENOMEM;
 368         }
 369
 370         memcpy(f->target, target, targetlen + 1);
 371         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 372
 373         /* No data here. Only a metadata node, which will be
 374            obsoleted by the first data write
 375         */
 376         f->metadata = fn;
 377         up(&f->sem);
 378
 379         jffs2_complete_reservation(c);
 380
 381         ret = jffs2_init_security(inode, dir_i);
 382         if (ret) {
 383                 jffs2_clear_inode(inode);
 384                 return ret;
 385         }
 386         ret = jffs2_init_acl_post(inode);
 387         if (ret) {
 388                 jffs2_clear_inode(inode);
 389                 return ret;
 390         }
 391
 392         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 393                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 394         if (ret) {
 395                 /* Eep. */
 396                 jffs2_clear_inode(inode);
 397                 return ret;
 398         }
 399
 400         rd = jffs2_alloc_raw_dirent();
 401         if (!rd) {
 402                 /* Argh. Now we treat it like a normal delete */
 403                 jffs2_complete_reservation(c);
 404                 jffs2_clear_inode(inode);
 405                 return -ENOMEM;
 406         }
 407
 408         dir_f = JFFS2_INODE_INFO(dir_i);
 409         down(&dir_f->sem);
 410
 411         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 412         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 413         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 414         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 415
 416         rd->pino = cpu_to_je32(dir_i->i_ino);
 417         rd->version = cpu_to_je32(++dir_f->highest_version);
 418         rd->ino = cpu_to_je32(inode->i_ino);
 419         rd->mctime = cpu_to_je32(get_seconds());
 420         rd->nsize = namelen;
 421         rd->type = DT_LNK;
 422         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 423         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 424
 425         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 426
 427         if (IS_ERR(fd)) {
 428                 /* dirent failed to write. Delete the inode normally
 429                    as if it were the final unlink() */
 430                 jffs2_complete_reservation(c);
 431                 jffs2_free_raw_dirent(rd);
 432                 up(&dir_f->sem);
 433                 jffs2_clear_inode(inode);
 434                 return PTR_ERR(fd);
 435         }
 436
 437         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 438
 439         jffs2_free_raw_dirent(rd);
 440
 441         /* Link the fd into the inode's list, obsoleting an old
 442            one if necessary. */
 443         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 444
 445         up(&dir_f->sem);
 446         jffs2_complete_reservation(c);
 447
 448         d_instantiate(dentry, inode);
 449         return 0;
 450 }
 451
 452
 453 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 454 {
 455         struct jffs2_inode_info *f, *dir_f;
 456         struct jffs2_sb_info *c;
 457         struct inode *inode;
 458         struct jffs2_raw_inode *ri;
 459         struct jffs2_raw_dirent *rd;
 460         struct jffs2_full_dnode *fn;
 461         struct jffs2_full_dirent *fd;
 462         int namelen;
 463         uint32_t alloclen;
 464         int ret;
 465
 466         mode |= S_IFDIR;
 467
 468         ri = jffs2_alloc_raw_inode();
 469         if (!ri)
 470                 return -ENOMEM;
 471
 472         c = JFFS2_SB_INFO(dir_i->i_sb);
 473
 474         /* Try to reserve enough space for both node and dirent.
 475          * Just the node will do for now, though
 476          */
 477         namelen = dentry->d_name.len;
 478         ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
 479                                   JFFS2_SUMMARY_INODE_SIZE);
 480
 481         if (ret) {
 482                 jffs2_free_raw_inode(ri);
 483                 return ret;
 484         }
 485
 486         inode = jffs2_new_inode(dir_i, mode, ri);
 487
 488         if (IS_ERR(inode)) {
 489                 jffs2_free_raw_inode(ri);
 490                 jffs2_complete_reservation(c);
 491                 return PTR_ERR(inode);
 492         }
 493
 494         inode->i_op = &jffs2_dir_inode_operations;
 495         inode->i_fop = &jffs2_dir_operations;
 496         /* Directories get nlink 2 at start */
 497         inode->i_nlink = 2;
 498
 499         f = JFFS2_INODE_INFO(inode);
 500
 501         ri->data_crc = cpu_to_je32(0);
 502         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 503
 504         fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
 505
 506         jffs2_free_raw_inode(ri);
 507
 508         if (IS_ERR(fn)) {
 509                 /* Eeek. Wave bye bye */
 510                 up(&f->sem);
 511                 jffs2_complete_reservation(c);
 512                 jffs2_clear_inode(inode);
 513                 return PTR_ERR(fn);
 514         }
 515         /* No data here. Only a metadata node, which will be
 516            obsoleted by the first data write
 517         */
 518         f->metadata = fn;
 519         up(&f->sem);
 520
 521         jffs2_complete_reservation(c);
 522
 523         ret = jffs2_init_security(inode, dir_i);
 524         if (ret) {
 525                 jffs2_clear_inode(inode);
 526                 return ret;
 527         }
 528         ret = jffs2_init_acl_post(inode);
 529         if (ret) {
 530                 jffs2_clear_inode(inode);
 531                 return ret;
 532         }
 533
 534         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 535                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 536         if (ret) {
 537                 /* Eep. */
 538                 jffs2_clear_inode(inode);
 539                 return ret;
 540         }
 541
 542         rd = jffs2_alloc_raw_dirent();
 543         if (!rd) {
 544                 /* Argh. Now we treat it like a normal delete */
 545                 jffs2_complete_reservation(c);
 546                 jffs2_clear_inode(inode);
 547                 return -ENOMEM;
 548         }
 549
 550         dir_f = JFFS2_INODE_INFO(dir_i);
 551         down(&dir_f->sem);
 552
 553         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 554         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 555         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 556         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 557
 558         rd->pino = cpu_to_je32(dir_i->i_ino);
 559         rd->version = cpu_to_je32(++dir_f->highest_version);
 560         rd->ino = cpu_to_je32(inode->i_ino);
 561         rd->mctime = cpu_to_je32(get_seconds());
 562         rd->nsize = namelen;
 563         rd->type = DT_DIR;
 564         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 565         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 566
 567         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 568
 569         if (IS_ERR(fd)) {
 570                 /* dirent failed to write. Delete the inode normally
 571                    as if it were the final unlink() */
 572                 jffs2_complete_reservation(c);
 573                 jffs2_free_raw_dirent(rd);
 574                 up(&dir_f->sem);
 575                 jffs2_clear_inode(inode);
 576                 return PTR_ERR(fd);
 577         }
 578
 579         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 580         inc_nlink(dir_i);
 581
 582         jffs2_free_raw_dirent(rd);
 583
 584         /* Link the fd into the inode's list, obsoleting an old
 585            one if necessary. */
 586         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 587
 588         up(&dir_f->sem);
 589         jffs2_complete_reservation(c);
 590
 591         d_instantiate(dentry, inode);
 592         return 0;
 593 }
 594
 595 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 596 {
 597         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 598         struct jffs2_full_dirent *fd;
 599         int ret;
 600
 601         for (fd = f->dents ; fd; fd = fd->next) {
 602                 if (fd->ino)
 603                         return -ENOTEMPTY;
 604         }
 605         ret = jffs2_unlink(dir_i, dentry);
 606         if (!ret)
 607                 drop_nlink(dir_i);
 608         return ret;
 609 }
 610
 611 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 612 {
 613         struct jffs2_inode_info *f, *dir_f;
 614         struct jffs2_sb_info *c;
 615         struct inode *inode;
 616         struct jffs2_raw_inode *ri;
 617         struct jffs2_raw_dirent *rd;
 618         struct jffs2_full_dnode *fn;
 619         struct jffs2_full_dirent *fd;
 620         int namelen;
 621         union jffs2_device_node dev;
 622         int devlen = 0;
 623         uint32_t alloclen;
 624         int ret;
 625
 626         if (!new_valid_dev(rdev))
 627                 return -EINVAL;
 628
 629         ri = jffs2_alloc_raw_inode();
 630         if (!ri)
 631                 return -ENOMEM;
 632
 633         c = JFFS2_SB_INFO(dir_i->i_sb);
 634
 635         if (S_ISBLK(mode) || S_ISCHR(mode))
 636                 devlen = jffs2_encode_dev(&dev, rdev);
 637
 638         /* Try to reserve enough space for both node and dirent.
 639          * Just the node will do for now, though
 640          */
 641         namelen = dentry->d_name.len;
 642         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
 643                                   ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
 644
 645         if (ret) {
 646                 jffs2_free_raw_inode(ri);
 647                 return ret;
 648         }
 649
 650         inode = jffs2_new_inode(dir_i, mode, ri);
 651
 652         if (IS_ERR(inode)) {
 653                 jffs2_free_raw_inode(ri);
 654                 jffs2_complete_reservation(c);
 655                 return PTR_ERR(inode);
 656         }
 657         inode->i_op = &jffs2_file_inode_operations;
 658         init_special_inode(inode, inode->i_mode, rdev);
 659
 660         f = JFFS2_INODE_INFO(inode);
 661
 662         ri->dsize = ri->csize = cpu_to_je32(devlen);
 663         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 664         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 665
 666         ri->compr = JFFS2_COMPR_NONE;
 667         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 668         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 669
 670         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
 671
 672         jffs2_free_raw_inode(ri);
 673
 674         if (IS_ERR(fn)) {
 675                 /* Eeek. Wave bye bye */
 676                 up(&f->sem);
 677                 jffs2_complete_reservation(c);
 678                 jffs2_clear_inode(inode);
 679                 return PTR_ERR(fn);
 680         }
 681         /* No data here. Only a metadata node, which will be
 682            obsoleted by the first data write
 683         */
 684         f->metadata = fn;
 685         up(&f->sem);
 686
 687         jffs2_complete_reservation(c);
 688
 689         ret = jffs2_init_security(inode, dir_i);
 690         if (ret) {
 691                 jffs2_clear_inode(inode);
 692                 return ret;
 693         }
 694         ret = jffs2_init_acl_post(inode);
 695         if (ret) {
 696                 jffs2_clear_inode(inode);
 697                 return ret;
 698         }
 699
 700         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
 701                                   ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
 702         if (ret) {
 703                 /* Eep. */
 704                 jffs2_clear_inode(inode);
 705                 return ret;
 706         }
 707
 708         rd = jffs2_alloc_raw_dirent();
 709         if (!rd) {
 710                 /* Argh. Now we treat it like a normal delete */
 711                 jffs2_complete_reservation(c);
 712                 jffs2_clear_inode(inode);
 713                 return -ENOMEM;
 714         }
 715
 716         dir_f = JFFS2_INODE_INFO(dir_i);
 717         down(&dir_f->sem);
 718
 719         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 720         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 721         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 722         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 723
 724         rd->pino = cpu_to_je32(dir_i->i_ino);
 725         rd->version = cpu_to_je32(++dir_f->highest_version);
 726         rd->ino = cpu_to_je32(inode->i_ino);
 727         rd->mctime = cpu_to_je32(get_seconds());
 728         rd->nsize = namelen;
 729
 730         /* XXX: This is ugly. */
 731         rd->type = (mode & S_IFMT) >> 12;
 732
 733         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 734         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 735
 736         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
 737
 738         if (IS_ERR(fd)) {
 739                 /* dirent failed to write. Delete the inode normally
 740                    as if it were the final unlink() */
 741                 jffs2_complete_reservation(c);
 742                 jffs2_free_raw_dirent(rd);
 743                 up(&dir_f->sem);
 744                 jffs2_clear_inode(inode);
 745                 return PTR_ERR(fd);
 746         }
 747
 748         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 749
 750         jffs2_free_raw_dirent(rd);
 751
 752         /* Link the fd into the inode's list, obsoleting an old
 753            one if necessary. */
 754         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 755
 756         up(&dir_f->sem);
 757         jffs2_complete_reservation(c);
 758
 759         d_instantiate(dentry, inode);
 760
 761         return 0;
 762 }
 763
 764 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 765                          struct inode *new_dir_i, struct dentry *new_dentry)
 766 {
 767         int ret;
 768         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 769         struct jffs2_inode_info *victim_f = NULL;
 770         uint8_t type;
 771         uint32_t now;
 772
 773         /* The VFS will check for us and prevent trying to rename a
 774          * file over a directory and vice versa, but if it's a directory,
 775          * the VFS can't check whether the victim is empty. The filesystem
 776          * needs to do that for itself.
 777          */
 778         if (new_dentry->d_inode) {
 779                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 780                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 781                         struct jffs2_full_dirent *fd;
 782
 783                         down(&victim_f->sem);
 784                         for (fd = victim_f->dents; fd; fd = fd->next) {
 785                                 if (fd->ino) {
 786                                         up(&victim_f->sem);
 787                                         return -ENOTEMPTY;
 788                                 }
 789                         }
 790                         up(&victim_f->sem);
 791                 }
 792         }
 793
 794         /* XXX: We probably ought to alloc enough space for
 795            both nodes at the same time. Writing the new link,
 796            then getting -ENOSPC, is quite bad :)
 797         */
 798
 799         /* Make a hard link */
 800
 801         /* XXX: This is ugly */
 802         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 803         if (!type) type = DT_REG;
 804
 805         now = get_seconds();
 806         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 807                             old_dentry->d_inode->i_ino, type,
 808                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 809
 810         if (ret)
 811                 return ret;
 812
 813         if (victim_f) {
 814                 /* There was a victim. Kill it off nicely */
 815                 drop_nlink(new_dentry->d_inode);
 816                 /* Don't oops if the victim was a dirent pointing to an
 817                    inode which didn't exist. */
 818                 if (victim_f->inocache) {
 819                         down(&victim_f->sem);
 820                         victim_f->inocache->nlink--;
 821                         up(&victim_f->sem);
 822                 }
 823         }
 824
 825         /* If it was a directory we moved, and there was no victim,
 826            increase i_nlink on its new parent */
 827         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 828                 inc_nlink(new_dir_i);
 829
 830         /* Unlink the original */
 831         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 832                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 833
 834         /* We don't touch inode->i_nlink */
 835
 836         if (ret) {
 837                 /* Oh shit. We really ought to make a single node which can do both atomically */
 838                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 839                 down(&f->sem);
 840                 inc_nlink(old_dentry->d_inode);
 841                 if (f->inocache)
 842                         f->inocache->nlink++;
 843                 up(&f->sem);
 844
 845                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 846                 /* Might as well let the VFS know */
 847                 d_instantiate(new_dentry, old_dentry->d_inode);
 848                 atomic_inc(&old_dentry->d_inode->i_count);
 849                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 850                 return ret;
 851         }
 852
 853         if (S_ISDIR(old_dentry->d_inode->i_mode))
 854                 drop_nlink(old_dir_i);
 855
 856         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 857
 858         return 0;
 859 }
 860