fs/ext4/ioctl.c

   1 /*
   2  * linux/fs/ext4/ioctl.c
   3  *
   4  * Copyright (C) 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  */
   9
  10 #include <linux/fs.h>
  11 #include <linux/jbd2.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <asm/uaccess.h>
  18 #include "ext4_jbd2.h"
  19 #include "ext4.h"
  20
  21 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
  22
  23 /**
  24  * Swap memory between @a and @b for @len bytes.
  25  *
  26  * @a:          pointer to first memory area
  27  * @b:          pointer to second memory area
  28  * @len:        number of bytes to swap
  29  *
  30  */
  31 static void memswap(void *a, void *b, size_t len)
  32 {
  33         unsigned char *ap, *bp;
  34         unsigned char tmp;
  35
  36         ap = (unsigned char *)a;
  37         bp = (unsigned char *)b;
  38         while (len-- > 0) {
  39                 tmp = *ap;
  40                 *ap = *bp;
  41                 *bp = tmp;
  42                 ap++;
  43                 bp++;
  44         }
  45 }
  46
  47 /**
  48  * Swap i_data and associated attributes between @inode1 and @inode2.
  49  * This function is used for the primary swap between inode1 and inode2
  50  * and also to revert this primary swap in case of errors.
  51  *
  52  * Therefore you have to make sure, that calling this method twice
  53  * will revert all changes.
  54  *
  55  * @inode1:     pointer to first inode
  56  * @inode2:     pointer to second inode
  57  */
  58 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  59 {
  60         loff_t isize;
  61         struct ext4_inode_info *ei1;
  62         struct ext4_inode_info *ei2;
  63
  64         ei1 = EXT4_I(inode1);
  65         ei2 = EXT4_I(inode2);
  66
  67         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  68         memswap(&inode1->i_version, &inode2->i_version,
  69                   sizeof(inode1->i_version));
  70         memswap(&inode1->i_blocks, &inode2->i_blocks,
  71                   sizeof(inode1->i_blocks));
  72         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  73         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  74         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  75
  76         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  77         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  78         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  79         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  80         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  81         ext4_es_lru_del(inode1);
  82         ext4_es_lru_del(inode2);
  83
  84         isize = i_size_read(inode1);
  85         i_size_write(inode1, i_size_read(inode2));
  86         i_size_write(inode2, isize);
  87 }
  88
  89 /**
  90  * Swap the information from the given @inode and the inode
  91  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  92  * important fields of the inodes.
  93  *
  94  * @sb:         the super block of the filesystem
  95  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  96  *
  97  */
  98 static long swap_inode_boot_loader(struct super_block *sb,
  99                                 struct inode *inode)
 100 {
 101         handle_t *handle;
 102         int err;
 103         struct inode *inode_bl;
 104         struct ext4_inode_info *ei_bl;
 105         struct ext4_sb_info *sbi = EXT4_SB(sb);
 106
 107         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 108                 return -EINVAL;
 109
 110         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 111                 return -EPERM;
 112
 113         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 114         if (IS_ERR(inode_bl))
 115                 return PTR_ERR(inode_bl);
 116         ei_bl = EXT4_I(inode_bl);
 117
 118         filemap_flush(inode->i_mapping);
 119         filemap_flush(inode_bl->i_mapping);
 120
 121         /* Protect orig inodes against a truncate and make sure,
 122          * that only 1 swap_inode_boot_loader is running. */
 123         lock_two_nondirectories(inode, inode_bl);
 124
 125         truncate_inode_pages(&inode->i_data, 0);
 126         truncate_inode_pages(&inode_bl->i_data, 0);
 127
 128         /* Wait for all existing dio workers */
 129         ext4_inode_block_unlocked_dio(inode);
 130         ext4_inode_block_unlocked_dio(inode_bl);
 131         inode_dio_wait(inode);
 132         inode_dio_wait(inode_bl);
 133
 134         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 135         if (IS_ERR(handle)) {
 136                 err = -EINVAL;
 137                 goto journal_err_out;
 138         }
 139
 140         /* Protect extent tree against block allocations via delalloc */
 141         ext4_double_down_write_data_sem(inode, inode_bl);
 142
 143         if (inode_bl->i_nlink == 0) {
 144                 /* this inode has never been used as a BOOT_LOADER */
 145                 set_nlink(inode_bl, 1);
 146                 i_uid_write(inode_bl, 0);
 147                 i_gid_write(inode_bl, 0);
 148                 inode_bl->i_flags = 0;
 149                 ei_bl->i_flags = 0;
 150                 inode_bl->i_version = 1;
 151                 i_size_write(inode_bl, 0);
 152                 inode_bl->i_mode = S_IFREG;
 153                 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
 154                                               EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 155                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 156                         ext4_ext_tree_init(handle, inode_bl);
 157                 } else
 158                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 159         }
 160
 161         swap_inode_data(inode, inode_bl);
 162
 163         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
 164
 165         spin_lock(&sbi->s_next_gen_lock);
 166         inode->i_generation = sbi->s_next_generation++;
 167         inode_bl->i_generation = sbi->s_next_generation++;
 168         spin_unlock(&sbi->s_next_gen_lock);
 169
 170         ext4_discard_preallocations(inode);
 171
 172         err = ext4_mark_inode_dirty(handle, inode);
 173         if (err < 0) {
 174                 ext4_warning(inode->i_sb,
 175                         "couldn't mark inode #%lu dirty (err %d)",
 176                         inode->i_ino, err);
 177                 /* Revert all changes: */
 178                 swap_inode_data(inode, inode_bl);
 179         } else {
 180                 err = ext4_mark_inode_dirty(handle, inode_bl);
 181                 if (err < 0) {
 182                         ext4_warning(inode_bl->i_sb,
 183                                 "couldn't mark inode #%lu dirty (err %d)",
 184                                 inode_bl->i_ino, err);
 185                         /* Revert all changes: */
 186                         swap_inode_data(inode, inode_bl);
 187                         ext4_mark_inode_dirty(handle, inode);
 188                 }
 189         }
 190         ext4_journal_stop(handle);
 191         ext4_double_up_write_data_sem(inode, inode_bl);
 192
 193 journal_err_out:
 194         ext4_inode_resume_unlocked_dio(inode);
 195         ext4_inode_resume_unlocked_dio(inode_bl);
 196         unlock_two_nondirectories(inode, inode_bl);
 197         iput(inode_bl);
 198         return err;
 199 }
 200
 201 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 202 {
 203         struct inode *inode = file_inode(filp);
 204         struct super_block *sb = inode->i_sb;
 205         struct ext4_inode_info *ei = EXT4_I(inode);
 206         unsigned int flags;
 207
 208         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 209
 210         switch (cmd) {
 211         case EXT4_IOC_GETFLAGS:
 212                 ext4_get_inode_flags(ei);
 213                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 214                 return put_user(flags, (int __user *) arg);
 215         case EXT4_IOC_SETFLAGS: {
 216                 handle_t *handle = NULL;
 217                 int err, migrate = 0;
 218                 struct ext4_iloc iloc;
 219                 unsigned int oldflags, mask, i;
 220                 unsigned int jflag;
 221
 222                 if (!inode_owner_or_capable(inode))
 223                         return -EACCES;
 224
 225                 if (get_user(flags, (int __user *) arg))
 226                         return -EFAULT;
 227
 228                 err = mnt_want_write_file(filp);
 229                 if (err)
 230                         return err;
 231
 232                 flags = ext4_mask_flags(inode->i_mode, flags);
 233
 234                 err = -EPERM;
 235                 mutex_lock(&inode->i_mutex);
 236                 /* Is it quota file? Do not allow user to mess with it */
 237                 if (IS_NOQUOTA(inode))
 238                         goto flags_out;
 239
 240                 oldflags = ei->i_flags;
 241
 242                 /* The JOURNAL_DATA flag is modifiable only by root */
 243                 jflag = flags & EXT4_JOURNAL_DATA_FL;
 244
 245                 /*
 246                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 247                  * the relevant capability.
 248                  *
 249                  * This test looks nicer. Thanks to Pauline Middelink
 250                  */
 251                 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 252                         if (!capable(CAP_LINUX_IMMUTABLE))
 253                                 goto flags_out;
 254                 }
 255
 256                 /*
 257                  * The JOURNAL_DATA flag can only be changed by
 258                  * the relevant capability.
 259                  */
 260                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 261                         if (!capable(CAP_SYS_RESOURCE))
 262                                 goto flags_out;
 263                 }
 264                 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 265                         migrate = 1;
 266
 267                 if (flags & EXT4_EOFBLOCKS_FL) {
 268                         /* we don't support adding EOFBLOCKS flag */
 269                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 270                                 err = -EOPNOTSUPP;
 271                                 goto flags_out;
 272                         }
 273                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
 274                         ext4_truncate(inode);
 275
 276                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 277                 if (IS_ERR(handle)) {
 278                         err = PTR_ERR(handle);
 279                         goto flags_out;
 280                 }
 281                 if (IS_SYNC(inode))
 282                         ext4_handle_sync(handle);
 283                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 284                 if (err)
 285                         goto flags_err;
 286
 287                 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 288                         if (!(mask & EXT4_FL_USER_MODIFIABLE))
 289                                 continue;
 290                         if (mask & flags)
 291                                 ext4_set_inode_flag(inode, i);
 292                         else
 293                                 ext4_clear_inode_flag(inode, i);
 294                 }
 295
 296                 ext4_set_inode_flags(inode);
 297                 inode->i_ctime = ext4_current_time(inode);
 298
 299                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 300 flags_err:
 301                 ext4_journal_stop(handle);
 302                 if (err)
 303                         goto flags_out;
 304
 305                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 306                         err = ext4_change_inode_journal_flag(inode, jflag);
 307                 if (err)
 308                         goto flags_out;
 309                 if (migrate) {
 310                         if (flags & EXT4_EXTENTS_FL)
 311                                 err = ext4_ext_migrate(inode);
 312                         else
 313                                 err = ext4_ind_migrate(inode);
 314                 }
 315
 316 flags_out:
 317                 mutex_unlock(&inode->i_mutex);
 318                 mnt_drop_write_file(filp);
 319                 return err;
 320         }
 321         case EXT4_IOC_GETVERSION:
 322         case EXT4_IOC_GETVERSION_OLD:
 323                 return put_user(inode->i_generation, (int __user *) arg);
 324         case EXT4_IOC_SETVERSION:
 325         case EXT4_IOC_SETVERSION_OLD: {
 326                 handle_t *handle;
 327                 struct ext4_iloc iloc;
 328                 __u32 generation;
 329                 int err;
 330
 331                 if (!inode_owner_or_capable(inode))
 332                         return -EPERM;
 333
 334                 if (ext4_has_metadata_csum(inode->i_sb)) {
 335                         ext4_warning(sb, "Setting inode version is not "
 336                                      "supported with metadata_csum enabled.");
 337                         return -ENOTTY;
 338                 }
 339
 340                 err = mnt_want_write_file(filp);
 341                 if (err)
 342                         return err;
 343                 if (get_user(generation, (int __user *) arg)) {
 344                         err = -EFAULT;
 345                         goto setversion_out;
 346                 }
 347
 348                 mutex_lock(&inode->i_mutex);
 349                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 350                 if (IS_ERR(handle)) {
 351                         err = PTR_ERR(handle);
 352                         goto unlock_out;
 353                 }
 354                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 355                 if (err == 0) {
 356                         inode->i_ctime = ext4_current_time(inode);
 357                         inode->i_generation = generation;
 358                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 359                 }
 360                 ext4_journal_stop(handle);
 361
 362 unlock_out:
 363                 mutex_unlock(&inode->i_mutex);
 364 setversion_out:
 365                 mnt_drop_write_file(filp);
 366                 return err;
 367         }
 368         case EXT4_IOC_GROUP_EXTEND: {
 369                 ext4_fsblk_t n_blocks_count;
 370                 int err, err2=0;
 371
 372                 err = ext4_resize_begin(sb);
 373                 if (err)
 374                         return err;
 375
 376                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 377                         err = -EFAULT;
 378                         goto group_extend_out;
 379                 }
 380
 381                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 382                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 383                         ext4_msg(sb, KERN_ERR,
 384                                  "Online resizing not supported with bigalloc");
 385                         err = -EOPNOTSUPP;
 386                         goto group_extend_out;
 387                 }
 388
 389                 err = mnt_want_write_file(filp);
 390                 if (err)
 391                         goto group_extend_out;
 392
 393                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 394                 if (EXT4_SB(sb)->s_journal) {
 395                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 396                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 397                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 398                 }
 399                 if (err == 0)
 400                         err = err2;
 401                 mnt_drop_write_file(filp);
 402 group_extend_out:
 403                 ext4_resize_end(sb);
 404                 return err;
 405         }
 406
 407         case EXT4_IOC_MOVE_EXT: {
 408                 struct move_extent me;
 409                 struct fd donor;
 410                 int err;
 411
 412                 if (!(filp->f_mode & FMODE_READ) ||
 413                     !(filp->f_mode & FMODE_WRITE))
 414                         return -EBADF;
 415
 416                 if (copy_from_user(&me,
 417                         (struct move_extent __user *)arg, sizeof(me)))
 418                         return -EFAULT;
 419                 me.moved_len = 0;
 420
 421                 donor = fdget(me.donor_fd);
 422                 if (!donor.file)
 423                         return -EBADF;
 424
 425                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 426                         err = -EBADF;
 427                         goto mext_out;
 428                 }
 429
 430                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 431                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 432                         ext4_msg(sb, KERN_ERR,
 433                                  "Online defrag not supported with bigalloc");
 434                         err = -EOPNOTSUPP;
 435                         goto mext_out;
 436                 }
 437
 438                 err = mnt_want_write_file(filp);
 439                 if (err)
 440                         goto mext_out;
 441
 442                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 443                                         me.donor_start, me.len, &me.moved_len);
 444                 mnt_drop_write_file(filp);
 445
 446                 if (copy_to_user((struct move_extent __user *)arg,
 447                                  &me, sizeof(me)))
 448                         err = -EFAULT;
 449 mext_out:
 450                 fdput(donor);
 451                 return err;
 452         }
 453
 454         case EXT4_IOC_GROUP_ADD: {
 455                 struct ext4_new_group_data input;
 456                 int err, err2=0;
 457
 458                 err = ext4_resize_begin(sb);
 459                 if (err)
 460                         return err;
 461
 462                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 463                                 sizeof(input))) {
 464                         err = -EFAULT;
 465                         goto group_add_out;
 466                 }
 467
 468                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 469                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 470                         ext4_msg(sb, KERN_ERR,
 471                                  "Online resizing not supported with bigalloc");
 472                         err = -EOPNOTSUPP;
 473                         goto group_add_out;
 474                 }
 475
 476                 err = mnt_want_write_file(filp);
 477                 if (err)
 478                         goto group_add_out;
 479
 480                 err = ext4_group_add(sb, &input);
 481                 if (EXT4_SB(sb)->s_journal) {
 482                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 483                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 484                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 485                 }
 486                 if (err == 0)
 487                         err = err2;
 488                 mnt_drop_write_file(filp);
 489                 if (!err && ext4_has_group_desc_csum(sb) &&
 490                     test_opt(sb, INIT_INODE_TABLE))
 491                         err = ext4_register_li_request(sb, input.group);
 492 group_add_out:
 493                 ext4_resize_end(sb);
 494                 return err;
 495         }
 496
 497         case EXT4_IOC_MIGRATE:
 498         {
 499                 int err;
 500                 if (!inode_owner_or_capable(inode))
 501                         return -EACCES;
 502
 503                 err = mnt_want_write_file(filp);
 504                 if (err)
 505                         return err;
 506                 /*
 507                  * inode_mutex prevent write and truncate on the file.
 508                  * Read still goes through. We take i_data_sem in
 509                  * ext4_ext_swap_inode_data before we switch the
 510                  * inode format to prevent read.
 511                  */
 512                 mutex_lock(&(inode->i_mutex));
 513                 err = ext4_ext_migrate(inode);
 514                 mutex_unlock(&(inode->i_mutex));
 515                 mnt_drop_write_file(filp);
 516                 return err;
 517         }
 518
 519         case EXT4_IOC_ALLOC_DA_BLKS:
 520         {
 521                 int err;
 522                 if (!inode_owner_or_capable(inode))
 523                         return -EACCES;
 524
 525                 err = mnt_want_write_file(filp);
 526                 if (err)
 527                         return err;
 528                 err = ext4_alloc_da_blocks(inode);
 529                 mnt_drop_write_file(filp);
 530                 return err;
 531         }
 532
 533         case EXT4_IOC_SWAP_BOOT:
 534         {
 535                 int err;
 536                 if (!(filp->f_mode & FMODE_WRITE))
 537                         return -EBADF;
 538                 err = mnt_want_write_file(filp);
 539                 if (err)
 540                         return err;
 541                 err = swap_inode_boot_loader(sb, inode);
 542                 mnt_drop_write_file(filp);
 543                 return err;
 544         }
 545
 546         case EXT4_IOC_RESIZE_FS: {
 547                 ext4_fsblk_t n_blocks_count;
 548                 int err = 0, err2 = 0;
 549                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 550
 551                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 552                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 553                         ext4_msg(sb, KERN_ERR,
 554                                  "Online resizing not (yet) supported with bigalloc");
 555                         return -EOPNOTSUPP;
 556                 }
 557
 558                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 559                                    sizeof(__u64))) {
 560                         return -EFAULT;
 561                 }
 562
 563                 err = ext4_resize_begin(sb);
 564                 if (err)
 565                         return err;
 566
 567                 err = mnt_want_write_file(filp);
 568                 if (err)
 569                         goto resizefs_out;
 570
 571                 err = ext4_resize_fs(sb, n_blocks_count);
 572                 if (EXT4_SB(sb)->s_journal) {
 573                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 574                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 575                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 576                 }
 577                 if (err == 0)
 578                         err = err2;
 579                 mnt_drop_write_file(filp);
 580                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 581                     ext4_has_group_desc_csum(sb) &&
 582                     test_opt(sb, INIT_INODE_TABLE))
 583                         err = ext4_register_li_request(sb, o_group);
 584
 585 resizefs_out:
 586                 ext4_resize_end(sb);
 587                 return err;
 588         }
 589
 590         case FITRIM:
 591         {
 592                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 593                 struct fstrim_range range;
 594                 int ret = 0;
 595
 596                 if (!capable(CAP_SYS_ADMIN))
 597                         return -EPERM;
 598
 599                 if (!blk_queue_discard(q))
 600                         return -EOPNOTSUPP;
 601
 602                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 603                     sizeof(range)))
 604                         return -EFAULT;
 605
 606                 range.minlen = max((unsigned int)range.minlen,
 607                                    q->limits.discard_granularity);
 608                 ret = ext4_trim_fs(sb, &range);
 609                 if (ret < 0)
 610                         return ret;
 611
 612                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 613                     sizeof(range)))
 614                         return -EFAULT;
 615
 616                 return 0;
 617         }
 618         case EXT4_IOC_PRECACHE_EXTENTS:
 619                 return ext4_ext_precache(inode);
 620
 621         default:
 622                 return -ENOTTY;
 623         }
 624 }
 625
 626 #ifdef CONFIG_COMPAT
 627 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 628 {
 629         /* These are just misnamed, they actually get/put from/to user an int */
 630         switch (cmd) {
 631         case EXT4_IOC32_GETFLAGS:
 632                 cmd = EXT4_IOC_GETFLAGS;
 633                 break;
 634         case EXT4_IOC32_SETFLAGS:
 635                 cmd = EXT4_IOC_SETFLAGS;
 636                 break;
 637         case EXT4_IOC32_GETVERSION:
 638                 cmd = EXT4_IOC_GETVERSION;
 639                 break;
 640         case EXT4_IOC32_SETVERSION:
 641                 cmd = EXT4_IOC_SETVERSION;
 642                 break;
 643         case EXT4_IOC32_GROUP_EXTEND:
 644                 cmd = EXT4_IOC_GROUP_EXTEND;
 645                 break;
 646         case EXT4_IOC32_GETVERSION_OLD:
 647                 cmd = EXT4_IOC_GETVERSION_OLD;
 648                 break;
 649         case EXT4_IOC32_SETVERSION_OLD:
 650                 cmd = EXT4_IOC_SETVERSION_OLD;
 651                 break;
 652         case EXT4_IOC32_GETRSVSZ:
 653                 cmd = EXT4_IOC_GETRSVSZ;
 654                 break;
 655         case EXT4_IOC32_SETRSVSZ:
 656                 cmd = EXT4_IOC_SETRSVSZ;
 657                 break;
 658         case EXT4_IOC32_GROUP_ADD: {
 659                 struct compat_ext4_new_group_input __user *uinput;
 660                 struct ext4_new_group_input input;
 661                 mm_segment_t old_fs;
 662                 int err;
 663
 664                 uinput = compat_ptr(arg);
 665                 err = get_user(input.group, &uinput->group);
 666                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 667                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 668                 err |= get_user(input.inode_table, &uinput->inode_table);
 669                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 670                 err |= get_user(input.reserved_blocks,
 671                                 &uinput->reserved_blocks);
 672                 if (err)
 673                         return -EFAULT;
 674                 old_fs = get_fs();
 675                 set_fs(KERNEL_DS);
 676                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 677                                  (unsigned long) &input);
 678                 set_fs(old_fs);
 679                 return err;
 680         }
 681         case EXT4_IOC_MOVE_EXT:
 682         case FITRIM:
 683         case EXT4_IOC_RESIZE_FS:
 684         case EXT4_IOC_PRECACHE_EXTENTS:
 685                 break;
 686         default:
 687                 return -ENOIOCTLCMD;
 688         }
 689         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 690 }
 691 #endif