fs/jffs2/dir.c

   1 /*
   2  * JFFS2 -- Journalling Flash File System, Version 2.
   3  *
   4  * Copyright (C) 2001-2003 Red Hat, Inc.
   5  *
   6  * Created by David Woodhouse <dwmw2@infradead.org>
   7  *
   8  * For licensing information, see the file 'LICENCE' in this directory.
   9  *
  10  * $Id: dir.c,v 1.88 2005/08/17 13:46:22 dedekind Exp $
  11  *
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/slab.h>
  16 #include <linux/sched.h>
  17 #include <linux/fs.h>
  18 #include <linux/crc32.h>
  19 #include <linux/jffs2.h>
  20 #include <linux/jffs2_fs_i.h>
  21 #include <linux/jffs2_fs_sb.h>
  22 #include <linux/time.h>
  23 #include "nodelist.h"
  24
  25 static int jffs2_readdir (struct file *, void *, filldir_t);
  26
  27 static int jffs2_create (struct inode *,struct dentry *,int,
  28                          struct nameidata *);
  29 static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
  30                                     struct nameidata *);
  31 static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
  32 static int jffs2_unlink (struct inode *,struct dentry *);
  33 static int jffs2_symlink (struct inode *,struct dentry *,const char *);
  34 static int jffs2_mkdir (struct inode *,struct dentry *,int);
  35 static int jffs2_rmdir (struct inode *,struct dentry *);
  36 static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
  37 static int jffs2_rename (struct inode *, struct dentry *,
  38                         struct inode *, struct dentry *);
  39
  40 struct file_operations jffs2_dir_operations =
  41 {
  42         .read =         generic_read_dir,
  43         .readdir =      jffs2_readdir,
  44         .ioctl =        jffs2_ioctl,
  45         .fsync =        jffs2_fsync
  46 };
  47
  48
  49 struct inode_operations jffs2_dir_inode_operations =
  50 {
  51         .create =       jffs2_create,
  52         .lookup =       jffs2_lookup,
  53         .link =         jffs2_link,
  54         .unlink =       jffs2_unlink,
  55         .symlink =      jffs2_symlink,
  56         .mkdir =        jffs2_mkdir,
  57         .rmdir =        jffs2_rmdir,
  58         .mknod =        jffs2_mknod,
  59         .rename =       jffs2_rename,
  60         .setattr =      jffs2_setattr,
  61 };
  62
  63 /***********************************************************************/
  64
  65
  66 /* We keep the dirent list sorted in increasing order of name hash,
  67    and we use the same hash function as the dentries. Makes this
  68    nice and simple
  69 */
  70 static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
  71                                    struct nameidata *nd)
  72 {
  73         struct jffs2_inode_info *dir_f;
  74         struct jffs2_sb_info *c;
  75         struct jffs2_full_dirent *fd = NULL, *fd_list;
  76         uint32_t ino = 0;
  77         struct inode *inode = NULL;
  78
  79         D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
  80
  81         dir_f = JFFS2_INODE_INFO(dir_i);
  82         c = JFFS2_SB_INFO(dir_i->i_sb);
  83
  84         down(&dir_f->sem);
  85
  86         /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
  87         for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
  88                 if (fd_list->nhash == target->d_name.hash &&
  89                     (!fd || fd_list->version > fd->version) &&
  90                     strlen(fd_list->name) == target->d_name.len &&
  91                     !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
  92                         fd = fd_list;
  93                 }
  94         }
  95         if (fd)
  96                 ino = fd->ino;
  97         up(&dir_f->sem);
  98         if (ino) {
  99                 inode = iget(dir_i->i_sb, ino);
 100                 if (!inode) {
 101                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
 102                         return (ERR_PTR(-EIO));
 103                 }
 104         }
 105
 106         d_add(target, inode);
 107
 108         return NULL;
 109 }
 110
 111 /***********************************************************************/
 112
 113
 114 static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
 115 {
 116         struct jffs2_inode_info *f;
 117         struct jffs2_sb_info *c;
 118         struct inode *inode = filp->f_dentry->d_inode;
 119         struct jffs2_full_dirent *fd;
 120         unsigned long offset, curofs;
 121
 122         D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
 123
 124         f = JFFS2_INODE_INFO(inode);
 125         c = JFFS2_SB_INFO(inode->i_sb);
 126
 127         offset = filp->f_pos;
 128
 129         if (offset == 0) {
 130                 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
 131                 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
 132                         goto out;
 133                 offset++;
 134         }
 135         if (offset == 1) {
 136                 unsigned long pino = parent_ino(filp->f_dentry);
 137                 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
 138                 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
 139                         goto out;
 140                 offset++;
 141         }
 142
 143         curofs=1;
 144         down(&f->sem);
 145         for (fd = f->dents; fd; fd = fd->next) {
 146
 147                 curofs++;
 148                 /* First loop: curofs = 2; offset = 2 */
 149                 if (curofs < offset) {
 150                         D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
 151                                   fd->name, fd->ino, fd->type, curofs, offset));
 152                         continue;
 153                 }
 154                 if (!fd->ino) {
 155                         D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
 156                         offset++;
 157                         continue;
 158                 }
 159                 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
 160                 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
 161                         break;
 162                 offset++;
 163         }
 164         up(&f->sem);
 165  out:
 166         filp->f_pos = offset;
 167         return 0;
 168 }
 169
 170 /***********************************************************************/
 171
 172
 173 static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
 174                         struct nameidata *nd)
 175 {
 176         struct jffs2_raw_inode *ri;
 177         struct jffs2_inode_info *f, *dir_f;
 178         struct jffs2_sb_info *c;
 179         struct inode *inode;
 180         int ret;
 181
 182         ri = jffs2_alloc_raw_inode();
 183         if (!ri)
 184                 return -ENOMEM;
 185
 186         c = JFFS2_SB_INFO(dir_i->i_sb);
 187
 188         D1(printk(KERN_DEBUG "jffs2_create()\n"));
 189
 190         inode = jffs2_new_inode(dir_i, mode, ri);
 191
 192         if (IS_ERR(inode)) {
 193                 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
 194                 jffs2_free_raw_inode(ri);
 195                 return PTR_ERR(inode);
 196         }
 197
 198         inode->i_op = &jffs2_file_inode_operations;
 199         inode->i_fop = &jffs2_file_operations;
 200         inode->i_mapping->a_ops = &jffs2_file_address_operations;
 201         inode->i_mapping->nrpages = 0;
 202
 203         f = JFFS2_INODE_INFO(inode);
 204         dir_f = JFFS2_INODE_INFO(dir_i);
 205
 206         ret = jffs2_do_create(c, dir_f, f, ri,
 207                               dentry->d_name.name, dentry->d_name.len);
 208
 209         if (ret) {
 210                 make_bad_inode(inode);
 211                 iput(inode);
 212                 jffs2_free_raw_inode(ri);
 213                 return ret;
 214         }
 215
 216         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
 217
 218         jffs2_free_raw_inode(ri);
 219         d_instantiate(dentry, inode);
 220
 221         D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
 222                   inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
 223         return 0;
 224 }
 225
 226 /***********************************************************************/
 227
 228
 229 static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
 230 {
 231         struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
 232         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 233         struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
 234         int ret;
 235         uint32_t now = get_seconds();
 236
 237         ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
 238                               dentry->d_name.len, dead_f, now);
 239         if (dead_f->inocache)
 240                 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
 241         if (!ret)
 242                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 243         return ret;
 244 }
 245 /***********************************************************************/
 246
 247
 248 static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
 249 {
 250         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
 251         struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 252         struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
 253         int ret;
 254         uint8_t type;
 255         uint32_t now;
 256
 257         /* Don't let people make hard links to bad inodes. */
 258         if (!f->inocache)
 259                 return -EIO;
 260
 261         if (S_ISDIR(old_dentry->d_inode->i_mode))
 262                 return -EPERM;
 263
 264         /* XXX: This is ugly */
 265         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 266         if (!type) type = DT_REG;
 267
 268         now = get_seconds();
 269         ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
 270
 271         if (!ret) {
 272                 down(&f->sem);
 273                 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
 274                 up(&f->sem);
 275                 d_instantiate(dentry, old_dentry->d_inode);
 276                 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
 277                 atomic_inc(&old_dentry->d_inode->i_count);
 278         }
 279         return ret;
 280 }
 281
 282 /***********************************************************************/
 283
 284 static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
 285 {
 286         struct jffs2_inode_info *f, *dir_f;
 287         struct jffs2_sb_info *c;
 288         struct inode *inode;
 289         struct jffs2_raw_inode *ri;
 290         struct jffs2_raw_dirent *rd;
 291         struct jffs2_full_dnode *fn;
 292         struct jffs2_full_dirent *fd;
 293         int namelen;
 294         uint32_t alloclen, phys_ofs;
 295         int ret, targetlen = strlen(target);
 296
 297         /* FIXME: If you care. We'd need to use frags for the target
 298            if it grows much more than this */
 299         if (targetlen > 254)
 300                 return -EINVAL;
 301
 302         ri = jffs2_alloc_raw_inode();
 303
 304         if (!ri)
 305                 return -ENOMEM;
 306
 307         c = JFFS2_SB_INFO(dir_i->i_sb);
 308
 309         /* Try to reserve enough space for both node and dirent.
 310          * Just the node will do for now, though
 311          */
 312         namelen = dentry->d_name.len;
 313         ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 314
 315         if (ret) {
 316                 jffs2_free_raw_inode(ri);
 317                 return ret;
 318         }
 319
 320         inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
 321
 322         if (IS_ERR(inode)) {
 323                 jffs2_free_raw_inode(ri);
 324                 jffs2_complete_reservation(c);
 325                 return PTR_ERR(inode);
 326         }
 327
 328         inode->i_op = &jffs2_symlink_inode_operations;
 329
 330         f = JFFS2_INODE_INFO(inode);
 331
 332         inode->i_size = targetlen;
 333         ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
 334         ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
 335         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 336
 337         ri->compr = JFFS2_COMPR_NONE;
 338         ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
 339         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 340
 341         fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
 342
 343         jffs2_free_raw_inode(ri);
 344
 345         if (IS_ERR(fn)) {
 346                 /* Eeek. Wave bye bye */
 347                 up(&f->sem);
 348                 jffs2_complete_reservation(c);
 349                 jffs2_clear_inode(inode);
 350                 return PTR_ERR(fn);
 351         }
 352
 353         /* We use f->target field to store the target path. */
 354         f->target = kmalloc(targetlen + 1, GFP_KERNEL);
 355         if (!f->target) {
 356                 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
 357                 up(&f->sem);
 358                 jffs2_complete_reservation(c);
 359                 jffs2_clear_inode(inode);
 360                 return -ENOMEM;
 361         }
 362
 363         memcpy(f->target, target, targetlen + 1);
 364         D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
 365
 366         /* No data here. Only a metadata node, which will be
 367            obsoleted by the first data write
 368         */
 369         f->metadata = fn;
 370         up(&f->sem);
 371
 372         jffs2_complete_reservation(c);
 373         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 374         if (ret) {
 375                 /* Eep. */
 376                 jffs2_clear_inode(inode);
 377                 return ret;
 378         }
 379
 380         rd = jffs2_alloc_raw_dirent();
 381         if (!rd) {
 382                 /* Argh. Now we treat it like a normal delete */
 383                 jffs2_complete_reservation(c);
 384                 jffs2_clear_inode(inode);
 385                 return -ENOMEM;
 386         }
 387
 388         dir_f = JFFS2_INODE_INFO(dir_i);
 389         down(&dir_f->sem);
 390
 391         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 392         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 393         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 394         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 395
 396         rd->pino = cpu_to_je32(dir_i->i_ino);
 397         rd->version = cpu_to_je32(++dir_f->highest_version);
 398         rd->ino = cpu_to_je32(inode->i_ino);
 399         rd->mctime = cpu_to_je32(get_seconds());
 400         rd->nsize = namelen;
 401         rd->type = DT_LNK;
 402         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 403         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 404
 405         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 406
 407         if (IS_ERR(fd)) {
 408                 /* dirent failed to write. Delete the inode normally
 409                    as if it were the final unlink() */
 410                 jffs2_complete_reservation(c);
 411                 jffs2_free_raw_dirent(rd);
 412                 up(&dir_f->sem);
 413                 jffs2_clear_inode(inode);
 414                 return PTR_ERR(fd);
 415         }
 416
 417         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 418
 419         jffs2_free_raw_dirent(rd);
 420
 421         /* Link the fd into the inode's list, obsoleting an old
 422            one if necessary. */
 423         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 424
 425         up(&dir_f->sem);
 426         jffs2_complete_reservation(c);
 427
 428         d_instantiate(dentry, inode);
 429         return 0;
 430 }
 431
 432
 433 static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
 434 {
 435         struct jffs2_inode_info *f, *dir_f;
 436         struct jffs2_sb_info *c;
 437         struct inode *inode;
 438         struct jffs2_raw_inode *ri;
 439         struct jffs2_raw_dirent *rd;
 440         struct jffs2_full_dnode *fn;
 441         struct jffs2_full_dirent *fd;
 442         int namelen;
 443         uint32_t alloclen, phys_ofs;
 444         int ret;
 445
 446         mode |= S_IFDIR;
 447
 448         ri = jffs2_alloc_raw_inode();
 449         if (!ri)
 450                 return -ENOMEM;
 451
 452         c = JFFS2_SB_INFO(dir_i->i_sb);
 453
 454         /* Try to reserve enough space for both node and dirent.
 455          * Just the node will do for now, though
 456          */
 457         namelen = dentry->d_name.len;
 458         ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL);
 459
 460         if (ret) {
 461                 jffs2_free_raw_inode(ri);
 462                 return ret;
 463         }
 464
 465         inode = jffs2_new_inode(dir_i, mode, ri);
 466
 467         if (IS_ERR(inode)) {
 468                 jffs2_free_raw_inode(ri);
 469                 jffs2_complete_reservation(c);
 470                 return PTR_ERR(inode);
 471         }
 472
 473         inode->i_op = &jffs2_dir_inode_operations;
 474         inode->i_fop = &jffs2_dir_operations;
 475         /* Directories get nlink 2 at start */
 476         inode->i_nlink = 2;
 477
 478         f = JFFS2_INODE_INFO(inode);
 479
 480         ri->data_crc = cpu_to_je32(0);
 481         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 482
 483         fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
 484
 485         jffs2_free_raw_inode(ri);
 486
 487         if (IS_ERR(fn)) {
 488                 /* Eeek. Wave bye bye */
 489                 up(&f->sem);
 490                 jffs2_complete_reservation(c);
 491                 jffs2_clear_inode(inode);
 492                 return PTR_ERR(fn);
 493         }
 494         /* No data here. Only a metadata node, which will be
 495            obsoleted by the first data write
 496         */
 497         f->metadata = fn;
 498         up(&f->sem);
 499
 500         jffs2_complete_reservation(c);
 501         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 502         if (ret) {
 503                 /* Eep. */
 504                 jffs2_clear_inode(inode);
 505                 return ret;
 506         }
 507
 508         rd = jffs2_alloc_raw_dirent();
 509         if (!rd) {
 510                 /* Argh. Now we treat it like a normal delete */
 511                 jffs2_complete_reservation(c);
 512                 jffs2_clear_inode(inode);
 513                 return -ENOMEM;
 514         }
 515
 516         dir_f = JFFS2_INODE_INFO(dir_i);
 517         down(&dir_f->sem);
 518
 519         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 520         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 521         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 522         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 523
 524         rd->pino = cpu_to_je32(dir_i->i_ino);
 525         rd->version = cpu_to_je32(++dir_f->highest_version);
 526         rd->ino = cpu_to_je32(inode->i_ino);
 527         rd->mctime = cpu_to_je32(get_seconds());
 528         rd->nsize = namelen;
 529         rd->type = DT_DIR;
 530         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 531         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 532
 533         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 534
 535         if (IS_ERR(fd)) {
 536                 /* dirent failed to write. Delete the inode normally
 537                    as if it were the final unlink() */
 538                 jffs2_complete_reservation(c);
 539                 jffs2_free_raw_dirent(rd);
 540                 up(&dir_f->sem);
 541                 jffs2_clear_inode(inode);
 542                 return PTR_ERR(fd);
 543         }
 544
 545         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 546         dir_i->i_nlink++;
 547
 548         jffs2_free_raw_dirent(rd);
 549
 550         /* Link the fd into the inode's list, obsoleting an old
 551            one if necessary. */
 552         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 553
 554         up(&dir_f->sem);
 555         jffs2_complete_reservation(c);
 556
 557         d_instantiate(dentry, inode);
 558         return 0;
 559 }
 560
 561 static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
 562 {
 563         struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
 564         struct jffs2_full_dirent *fd;
 565         int ret;
 566
 567         for (fd = f->dents ; fd; fd = fd->next) {
 568                 if (fd->ino)
 569                         return -ENOTEMPTY;
 570         }
 571         ret = jffs2_unlink(dir_i, dentry);
 572         if (!ret)
 573                 dir_i->i_nlink--;
 574         return ret;
 575 }
 576
 577 static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
 578 {
 579         struct jffs2_inode_info *f, *dir_f;
 580         struct jffs2_sb_info *c;
 581         struct inode *inode;
 582         struct jffs2_raw_inode *ri;
 583         struct jffs2_raw_dirent *rd;
 584         struct jffs2_full_dnode *fn;
 585         struct jffs2_full_dirent *fd;
 586         int namelen;
 587         jint16_t dev;
 588         int devlen = 0;
 589         uint32_t alloclen, phys_ofs;
 590         int ret;
 591
 592         if (!old_valid_dev(rdev))
 593                 return -EINVAL;
 594
 595         ri = jffs2_alloc_raw_inode();
 596         if (!ri)
 597                 return -ENOMEM;
 598
 599         c = JFFS2_SB_INFO(dir_i->i_sb);
 600
 601         if (S_ISBLK(mode) || S_ISCHR(mode)) {
 602                 dev = cpu_to_je16(old_encode_dev(rdev));
 603                 devlen = sizeof(dev);
 604         }
 605
 606         /* Try to reserve enough space for both node and dirent.
 607          * Just the node will do for now, though
 608          */
 609         namelen = dentry->d_name.len;
 610         ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 611
 612         if (ret) {
 613                 jffs2_free_raw_inode(ri);
 614                 return ret;
 615         }
 616
 617         inode = jffs2_new_inode(dir_i, mode, ri);
 618
 619         if (IS_ERR(inode)) {
 620                 jffs2_free_raw_inode(ri);
 621                 jffs2_complete_reservation(c);
 622                 return PTR_ERR(inode);
 623         }
 624         inode->i_op = &jffs2_file_inode_operations;
 625         init_special_inode(inode, inode->i_mode, rdev);
 626
 627         f = JFFS2_INODE_INFO(inode);
 628
 629         ri->dsize = ri->csize = cpu_to_je32(devlen);
 630         ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
 631         ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
 632
 633         ri->compr = JFFS2_COMPR_NONE;
 634         ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
 635         ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
 636
 637         fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
 638
 639         jffs2_free_raw_inode(ri);
 640
 641         if (IS_ERR(fn)) {
 642                 /* Eeek. Wave bye bye */
 643                 up(&f->sem);
 644                 jffs2_complete_reservation(c);
 645                 jffs2_clear_inode(inode);
 646                 return PTR_ERR(fn);
 647         }
 648         /* No data here. Only a metadata node, which will be
 649            obsoleted by the first data write
 650         */
 651         f->metadata = fn;
 652         up(&f->sem);
 653
 654         jffs2_complete_reservation(c);
 655         ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL);
 656         if (ret) {
 657                 /* Eep. */
 658                 jffs2_clear_inode(inode);
 659                 return ret;
 660         }
 661
 662         rd = jffs2_alloc_raw_dirent();
 663         if (!rd) {
 664                 /* Argh. Now we treat it like a normal delete */
 665                 jffs2_complete_reservation(c);
 666                 jffs2_clear_inode(inode);
 667                 return -ENOMEM;
 668         }
 669
 670         dir_f = JFFS2_INODE_INFO(dir_i);
 671         down(&dir_f->sem);
 672
 673         rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
 674         rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
 675         rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
 676         rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
 677
 678         rd->pino = cpu_to_je32(dir_i->i_ino);
 679         rd->version = cpu_to_je32(++dir_f->highest_version);
 680         rd->ino = cpu_to_je32(inode->i_ino);
 681         rd->mctime = cpu_to_je32(get_seconds());
 682         rd->nsize = namelen;
 683
 684         /* XXX: This is ugly. */
 685         rd->type = (mode & S_IFMT) >> 12;
 686
 687         rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
 688         rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
 689
 690         fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
 691
 692         if (IS_ERR(fd)) {
 693                 /* dirent failed to write. Delete the inode normally
 694                    as if it were the final unlink() */
 695                 jffs2_complete_reservation(c);
 696                 jffs2_free_raw_dirent(rd);
 697                 up(&dir_f->sem);
 698                 jffs2_clear_inode(inode);
 699                 return PTR_ERR(fd);
 700         }
 701
 702         dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
 703
 704         jffs2_free_raw_dirent(rd);
 705
 706         /* Link the fd into the inode's list, obsoleting an old
 707            one if necessary. */
 708         jffs2_add_fd_to_list(c, fd, &dir_f->dents);
 709
 710         up(&dir_f->sem);
 711         jffs2_complete_reservation(c);
 712
 713         d_instantiate(dentry, inode);
 714
 715         return 0;
 716 }
 717
 718 static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
 719                         struct inode *new_dir_i, struct dentry *new_dentry)
 720 {
 721         int ret;
 722         struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
 723         struct jffs2_inode_info *victim_f = NULL;
 724         uint8_t type;
 725         uint32_t now;
 726
 727         /* The VFS will check for us and prevent trying to rename a
 728          * file over a directory and vice versa, but if it's a directory,
 729          * the VFS can't check whether the victim is empty. The filesystem
 730          * needs to do that for itself.
 731          */
 732         if (new_dentry->d_inode) {
 733                 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
 734                 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
 735                         struct jffs2_full_dirent *fd;
 736
 737                         down(&victim_f->sem);
 738                         for (fd = victim_f->dents; fd; fd = fd->next) {
 739                                 if (fd->ino) {
 740                                         up(&victim_f->sem);
 741                                         return -ENOTEMPTY;
 742                                 }
 743                         }
 744                         up(&victim_f->sem);
 745                 }
 746         }
 747
 748         /* XXX: We probably ought to alloc enough space for
 749            both nodes at the same time. Writing the new link,
 750            then getting -ENOSPC, is quite bad :)
 751         */
 752
 753         /* Make a hard link */
 754
 755         /* XXX: This is ugly */
 756         type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
 757         if (!type) type = DT_REG;
 758
 759         now = get_seconds();
 760         ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
 761                             old_dentry->d_inode->i_ino, type,
 762                             new_dentry->d_name.name, new_dentry->d_name.len, now);
 763
 764         if (ret)
 765                 return ret;
 766
 767         if (victim_f) {
 768                 /* There was a victim. Kill it off nicely */
 769                 new_dentry->d_inode->i_nlink--;
 770                 /* Don't oops if the victim was a dirent pointing to an
 771                    inode which didn't exist. */
 772                 if (victim_f->inocache) {
 773                         down(&victim_f->sem);
 774                         victim_f->inocache->nlink--;
 775                         up(&victim_f->sem);
 776                 }
 777         }
 778
 779         /* If it was a directory we moved, and there was no victim,
 780            increase i_nlink on its new parent */
 781         if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
 782                 new_dir_i->i_nlink++;
 783
 784         /* Unlink the original */
 785         ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
 786                               old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
 787
 788         /* We don't touch inode->i_nlink */
 789
 790         if (ret) {
 791                 /* Oh shit. We really ought to make a single node which can do both atomically */
 792                 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
 793                 down(&f->sem);
 794                 old_dentry->d_inode->i_nlink++;
 795                 if (f->inocache)
 796                         f->inocache->nlink++;
 797                 up(&f->sem);
 798
 799                 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
 800                 /* Might as well let the VFS know */
 801                 d_instantiate(new_dentry, old_dentry->d_inode);
 802                 atomic_inc(&old_dentry->d_inode->i_count);
 803                 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
 804                 return ret;
 805         }
 806
 807         if (S_ISDIR(old_dentry->d_inode->i_mode))
 808                 old_dir_i->i_nlink--;
 809
 810         new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
 811
 812         return 0;
 813 }
 814