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_RO_COMPAT_FEATURE(inode->i_sb,
 335                                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
 336                         ext4_warning(sb, "Setting inode version is not "
 337                                      "supported with metadata_csum enabled.");
 338                         return -ENOTTY;
 339                 }
 340
 341                 err = mnt_want_write_file(filp);
 342                 if (err)
 343                         return err;
 344                 if (get_user(generation, (int __user *) arg)) {
 345                         err = -EFAULT;
 346                         goto setversion_out;
 347                 }
 348
 349                 mutex_lock(&inode->i_mutex);
 350                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 351                 if (IS_ERR(handle)) {
 352                         err = PTR_ERR(handle);
 353                         goto unlock_out;
 354                 }
 355                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 356                 if (err == 0) {
 357                         inode->i_ctime = ext4_current_time(inode);
 358                         inode->i_generation = generation;
 359                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 360                 }
 361                 ext4_journal_stop(handle);
 362
 363 unlock_out:
 364                 mutex_unlock(&inode->i_mutex);
 365 setversion_out:
 366                 mnt_drop_write_file(filp);
 367                 return err;
 368         }
 369         case EXT4_IOC_GROUP_EXTEND: {
 370                 ext4_fsblk_t n_blocks_count;
 371                 int err, err2=0;
 372
 373                 err = ext4_resize_begin(sb);
 374                 if (err)
 375                         return err;
 376
 377                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 378                         err = -EFAULT;
 379                         goto group_extend_out;
 380                 }
 381
 382                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 383                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 384                         ext4_msg(sb, KERN_ERR,
 385                                  "Online resizing not supported with bigalloc");
 386                         err = -EOPNOTSUPP;
 387                         goto group_extend_out;
 388                 }
 389
 390                 err = mnt_want_write_file(filp);
 391                 if (err)
 392                         goto group_extend_out;
 393
 394                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 395                 if (EXT4_SB(sb)->s_journal) {
 396                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 397                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 398                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 399                 }
 400                 if (err == 0)
 401                         err = err2;
 402                 mnt_drop_write_file(filp);
 403 group_extend_out:
 404                 ext4_resize_end(sb);
 405                 return err;
 406         }
 407
 408         case EXT4_IOC_MOVE_EXT: {
 409                 struct move_extent me;
 410                 struct fd donor;
 411                 int err;
 412
 413                 if (!(filp->f_mode & FMODE_READ) ||
 414                     !(filp->f_mode & FMODE_WRITE))
 415                         return -EBADF;
 416
 417                 if (copy_from_user(&me,
 418                         (struct move_extent __user *)arg, sizeof(me)))
 419                         return -EFAULT;
 420                 me.moved_len = 0;
 421
 422                 donor = fdget(me.donor_fd);
 423                 if (!donor.file)
 424                         return -EBADF;
 425
 426                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 427                         err = -EBADF;
 428                         goto mext_out;
 429                 }
 430
 431                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 432                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 433                         ext4_msg(sb, KERN_ERR,
 434                                  "Online defrag not supported with bigalloc");
 435                         err = -EOPNOTSUPP;
 436                         goto mext_out;
 437                 }
 438
 439                 err = mnt_want_write_file(filp);
 440                 if (err)
 441                         goto mext_out;
 442
 443                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 444                                         me.donor_start, me.len, &me.moved_len);
 445                 mnt_drop_write_file(filp);
 446
 447                 if (copy_to_user((struct move_extent __user *)arg,
 448                                  &me, sizeof(me)))
 449                         err = -EFAULT;
 450 mext_out:
 451                 fdput(donor);
 452                 return err;
 453         }
 454
 455         case EXT4_IOC_GROUP_ADD: {
 456                 struct ext4_new_group_data input;
 457                 int err, err2=0;
 458
 459                 err = ext4_resize_begin(sb);
 460                 if (err)
 461                         return err;
 462
 463                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 464                                 sizeof(input))) {
 465                         err = -EFAULT;
 466                         goto group_add_out;
 467                 }
 468
 469                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 470                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 471                         ext4_msg(sb, KERN_ERR,
 472                                  "Online resizing not supported with bigalloc");
 473                         err = -EOPNOTSUPP;
 474                         goto group_add_out;
 475                 }
 476
 477                 err = mnt_want_write_file(filp);
 478                 if (err)
 479                         goto group_add_out;
 480
 481                 err = ext4_group_add(sb, &input);
 482                 if (EXT4_SB(sb)->s_journal) {
 483                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 484                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 485                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 486                 }
 487                 if (err == 0)
 488                         err = err2;
 489                 mnt_drop_write_file(filp);
 490                 if (!err && ext4_has_group_desc_csum(sb) &&
 491                     test_opt(sb, INIT_INODE_TABLE))
 492                         err = ext4_register_li_request(sb, input.group);
 493 group_add_out:
 494                 ext4_resize_end(sb);
 495                 return err;
 496         }
 497
 498         case EXT4_IOC_MIGRATE:
 499         {
 500                 int err;
 501                 if (!inode_owner_or_capable(inode))
 502                         return -EACCES;
 503
 504                 err = mnt_want_write_file(filp);
 505                 if (err)
 506                         return err;
 507                 /*
 508                  * inode_mutex prevent write and truncate on the file.
 509                  * Read still goes through. We take i_data_sem in
 510                  * ext4_ext_swap_inode_data before we switch the
 511                  * inode format to prevent read.
 512                  */
 513                 mutex_lock(&(inode->i_mutex));
 514                 err = ext4_ext_migrate(inode);
 515                 mutex_unlock(&(inode->i_mutex));
 516                 mnt_drop_write_file(filp);
 517                 return err;
 518         }
 519
 520         case EXT4_IOC_ALLOC_DA_BLKS:
 521         {
 522                 int err;
 523                 if (!inode_owner_or_capable(inode))
 524                         return -EACCES;
 525
 526                 err = mnt_want_write_file(filp);
 527                 if (err)
 528                         return err;
 529                 err = ext4_alloc_da_blocks(inode);
 530                 mnt_drop_write_file(filp);
 531                 return err;
 532         }
 533
 534         case EXT4_IOC_SWAP_BOOT:
 535                 if (!(filp->f_mode & FMODE_WRITE))
 536                         return -EBADF;
 537                 return swap_inode_boot_loader(sb, inode);
 538
 539         case EXT4_IOC_RESIZE_FS: {
 540                 ext4_fsblk_t n_blocks_count;
 541                 int err = 0, err2 = 0;
 542                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 543
 544                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 545                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 546                         ext4_msg(sb, KERN_ERR,
 547                                  "Online resizing not (yet) supported with bigalloc");
 548                         return -EOPNOTSUPP;
 549                 }
 550
 551                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 552                                    sizeof(__u64))) {
 553                         return -EFAULT;
 554                 }
 555
 556                 err = ext4_resize_begin(sb);
 557                 if (err)
 558                         return err;
 559
 560                 err = mnt_want_write_file(filp);
 561                 if (err)
 562                         goto resizefs_out;
 563
 564                 err = ext4_resize_fs(sb, n_blocks_count);
 565                 if (EXT4_SB(sb)->s_journal) {
 566                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 567                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 568                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 569                 }
 570                 if (err == 0)
 571                         err = err2;
 572                 mnt_drop_write_file(filp);
 573                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 574                     ext4_has_group_desc_csum(sb) &&
 575                     test_opt(sb, INIT_INODE_TABLE))
 576                         err = ext4_register_li_request(sb, o_group);
 577
 578 resizefs_out:
 579                 ext4_resize_end(sb);
 580                 return err;
 581         }
 582
 583         case FITRIM:
 584         {
 585                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 586                 struct fstrim_range range;
 587                 int ret = 0;
 588
 589                 if (!capable(CAP_SYS_ADMIN))
 590                         return -EPERM;
 591
 592                 if (!blk_queue_discard(q))
 593                         return -EOPNOTSUPP;
 594
 595                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 596                     sizeof(range)))
 597                         return -EFAULT;
 598
 599                 range.minlen = max((unsigned int)range.minlen,
 600                                    q->limits.discard_granularity);
 601                 ret = ext4_trim_fs(sb, &range);
 602                 if (ret < 0)
 603                         return ret;
 604
 605                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 606                     sizeof(range)))
 607                         return -EFAULT;
 608
 609                 return 0;
 610         }
 611         case EXT4_IOC_PRECACHE_EXTENTS:
 612                 return ext4_ext_precache(inode);
 613
 614         default:
 615                 return -ENOTTY;
 616         }
 617 }
 618
 619 #ifdef CONFIG_COMPAT
 620 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 621 {
 622         /* These are just misnamed, they actually get/put from/to user an int */
 623         switch (cmd) {
 624         case EXT4_IOC32_GETFLAGS:
 625                 cmd = EXT4_IOC_GETFLAGS;
 626                 break;
 627         case EXT4_IOC32_SETFLAGS:
 628                 cmd = EXT4_IOC_SETFLAGS;
 629                 break;
 630         case EXT4_IOC32_GETVERSION:
 631                 cmd = EXT4_IOC_GETVERSION;
 632                 break;
 633         case EXT4_IOC32_SETVERSION:
 634                 cmd = EXT4_IOC_SETVERSION;
 635                 break;
 636         case EXT4_IOC32_GROUP_EXTEND:
 637                 cmd = EXT4_IOC_GROUP_EXTEND;
 638                 break;
 639         case EXT4_IOC32_GETVERSION_OLD:
 640                 cmd = EXT4_IOC_GETVERSION_OLD;
 641                 break;
 642         case EXT4_IOC32_SETVERSION_OLD:
 643                 cmd = EXT4_IOC_SETVERSION_OLD;
 644                 break;
 645         case EXT4_IOC32_GETRSVSZ:
 646                 cmd = EXT4_IOC_GETRSVSZ;
 647                 break;
 648         case EXT4_IOC32_SETRSVSZ:
 649                 cmd = EXT4_IOC_SETRSVSZ;
 650                 break;
 651         case EXT4_IOC32_GROUP_ADD: {
 652                 struct compat_ext4_new_group_input __user *uinput;
 653                 struct ext4_new_group_input input;
 654                 mm_segment_t old_fs;
 655                 int err;
 656
 657                 uinput = compat_ptr(arg);
 658                 err = get_user(input.group, &uinput->group);
 659                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 660                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 661                 err |= get_user(input.inode_table, &uinput->inode_table);
 662                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 663                 err |= get_user(input.reserved_blocks,
 664                                 &uinput->reserved_blocks);
 665                 if (err)
 666                         return -EFAULT;
 667                 old_fs = get_fs();
 668                 set_fs(KERNEL_DS);
 669                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 670                                  (unsigned long) &input);
 671                 set_fs(old_fs);
 672                 return err;
 673         }
 674         case EXT4_IOC_MOVE_EXT:
 675         case FITRIM:
 676         case EXT4_IOC_RESIZE_FS:
 677         case EXT4_IOC_PRECACHE_EXTENTS:
 678                 break;
 679         default:
 680                 return -ENOIOCTLCMD;
 681         }
 682         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 683 }
 684 #endif