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