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 #include "ext4_extents.h"
  21
  22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
  23
  24 /**
  25  * Swap memory between @a and @b for @len bytes.
  26  *
  27  * @a:          pointer to first memory area
  28  * @b:          pointer to second memory area
  29  * @len:        number of bytes to swap
  30  *
  31  */
  32 static void memswap(void *a, void *b, size_t len)
  33 {
  34         unsigned char *ap, *bp;
  35         unsigned char tmp;
  36
  37         ap = (unsigned char *)a;
  38         bp = (unsigned char *)b;
  39         while (len-- > 0) {
  40                 tmp = *ap;
  41                 *ap = *bp;
  42                 *bp = tmp;
  43                 ap++;
  44                 bp++;
  45         }
  46 }
  47
  48 /**
  49  * Swap i_data and associated attributes between @inode1 and @inode2.
  50  * This function is used for the primary swap between inode1 and inode2
  51  * and also to revert this primary swap in case of errors.
  52  *
  53  * Therefore you have to make sure, that calling this method twice
  54  * will revert all changes.
  55  *
  56  * @inode1:     pointer to first inode
  57  * @inode2:     pointer to second inode
  58  */
  59 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  60 {
  61         loff_t isize;
  62         struct ext4_inode_info *ei1;
  63         struct ext4_inode_info *ei2;
  64
  65         ei1 = EXT4_I(inode1);
  66         ei2 = EXT4_I(inode2);
  67
  68         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  69         memswap(&inode1->i_version, &inode2->i_version,
  70                   sizeof(inode1->i_version));
  71         memswap(&inode1->i_blocks, &inode2->i_blocks,
  72                   sizeof(inode1->i_blocks));
  73         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  74         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  75         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  76
  77         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  78         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  79         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  80         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  81         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  82         ext4_es_lru_del(inode1);
  83         ext4_es_lru_del(inode2);
  84
  85         isize = i_size_read(inode1);
  86         i_size_write(inode1, i_size_read(inode2));
  87         i_size_write(inode2, isize);
  88 }
  89
  90 /**
  91  * Swap the information from the given @inode and the inode
  92  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  93  * important fields of the inodes.
  94  *
  95  * @sb:         the super block of the filesystem
  96  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  97  *
  98  */
  99 static long swap_inode_boot_loader(struct super_block *sb,
 100                                 struct inode *inode)
 101 {
 102         handle_t *handle;
 103         int err;
 104         struct inode *inode_bl;
 105         struct ext4_inode_info *ei;
 106         struct ext4_inode_info *ei_bl;
 107         struct ext4_sb_info *sbi;
 108
 109         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) {
 110                 err = -EINVAL;
 111                 goto swap_boot_out;
 112         }
 113
 114         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 115                 err = -EPERM;
 116                 goto swap_boot_out;
 117         }
 118
 119         sbi = EXT4_SB(sb);
 120         ei = EXT4_I(inode);
 121
 122         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 123         if (IS_ERR(inode_bl)) {
 124                 err = PTR_ERR(inode_bl);
 125                 goto swap_boot_out;
 126         }
 127         ei_bl = EXT4_I(inode_bl);
 128
 129         filemap_flush(inode->i_mapping);
 130         filemap_flush(inode_bl->i_mapping);
 131
 132         /* Protect orig inodes against a truncate and make sure,
 133          * that only 1 swap_inode_boot_loader is running. */
 134         ext4_inode_double_lock(inode, inode_bl);
 135
 136         truncate_inode_pages(&inode->i_data, 0);
 137         truncate_inode_pages(&inode_bl->i_data, 0);
 138
 139         /* Wait for all existing dio workers */
 140         ext4_inode_block_unlocked_dio(inode);
 141         ext4_inode_block_unlocked_dio(inode_bl);
 142         inode_dio_wait(inode);
 143         inode_dio_wait(inode_bl);
 144
 145         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 146         if (IS_ERR(handle)) {
 147                 err = -EINVAL;
 148                 goto journal_err_out;
 149         }
 150
 151         /* Protect extent tree against block allocations via delalloc */
 152         ext4_double_down_write_data_sem(inode, inode_bl);
 153
 154         if (inode_bl->i_nlink == 0) {
 155                 /* this inode has never been used as a BOOT_LOADER */
 156                 set_nlink(inode_bl, 1);
 157                 i_uid_write(inode_bl, 0);
 158                 i_gid_write(inode_bl, 0);
 159                 inode_bl->i_flags = 0;
 160                 ei_bl->i_flags = 0;
 161                 inode_bl->i_version = 1;
 162                 i_size_write(inode_bl, 0);
 163                 inode_bl->i_mode = S_IFREG;
 164                 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
 165                                               EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 166                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 167                         ext4_ext_tree_init(handle, inode_bl);
 168                 } else
 169                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 170         }
 171
 172         swap_inode_data(inode, inode_bl);
 173
 174         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
 175
 176         spin_lock(&sbi->s_next_gen_lock);
 177         inode->i_generation = sbi->s_next_generation++;
 178         inode_bl->i_generation = sbi->s_next_generation++;
 179         spin_unlock(&sbi->s_next_gen_lock);
 180
 181         ext4_discard_preallocations(inode);
 182
 183         err = ext4_mark_inode_dirty(handle, inode);
 184         if (err < 0) {
 185                 ext4_warning(inode->i_sb,
 186                         "couldn't mark inode #%lu dirty (err %d)",
 187                         inode->i_ino, err);
 188                 /* Revert all changes: */
 189                 swap_inode_data(inode, inode_bl);
 190         } else {
 191                 err = ext4_mark_inode_dirty(handle, inode_bl);
 192                 if (err < 0) {
 193                         ext4_warning(inode_bl->i_sb,
 194                                 "couldn't mark inode #%lu dirty (err %d)",
 195                                 inode_bl->i_ino, err);
 196                         /* Revert all changes: */
 197                         swap_inode_data(inode, inode_bl);
 198                         ext4_mark_inode_dirty(handle, inode);
 199                 }
 200         }
 201
 202         ext4_journal_stop(handle);
 203
 204         ext4_double_up_write_data_sem(inode, inode_bl);
 205
 206 journal_err_out:
 207         ext4_inode_resume_unlocked_dio(inode);
 208         ext4_inode_resume_unlocked_dio(inode_bl);
 209
 210         ext4_inode_double_unlock(inode, inode_bl);
 211
 212         iput(inode_bl);
 213
 214 swap_boot_out:
 215         return err;
 216 }
 217
 218 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 219 {
 220         struct inode *inode = file_inode(filp);
 221         struct super_block *sb = inode->i_sb;
 222         struct ext4_inode_info *ei = EXT4_I(inode);
 223         unsigned int flags;
 224
 225         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 226
 227         switch (cmd) {
 228         case EXT4_IOC_GETFLAGS:
 229                 ext4_get_inode_flags(ei);
 230                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 231                 return put_user(flags, (int __user *) arg);
 232         case EXT4_IOC_SETFLAGS: {
 233                 handle_t *handle = NULL;
 234                 int err, migrate = 0;
 235                 struct ext4_iloc iloc;
 236                 unsigned int oldflags, mask, i;
 237                 unsigned int jflag;
 238
 239                 if (!inode_owner_or_capable(inode))
 240                         return -EACCES;
 241
 242                 if (get_user(flags, (int __user *) arg))
 243                         return -EFAULT;
 244
 245                 err = mnt_want_write_file(filp);
 246                 if (err)
 247                         return err;
 248
 249                 flags = ext4_mask_flags(inode->i_mode, flags);
 250
 251                 err = -EPERM;
 252                 mutex_lock(&inode->i_mutex);
 253                 /* Is it quota file? Do not allow user to mess with it */
 254                 if (IS_NOQUOTA(inode))
 255                         goto flags_out;
 256
 257                 oldflags = ei->i_flags;
 258
 259                 /* The JOURNAL_DATA flag is modifiable only by root */
 260                 jflag = flags & EXT4_JOURNAL_DATA_FL;
 261
 262                 /*
 263                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 264                  * the relevant capability.
 265                  *
 266                  * This test looks nicer. Thanks to Pauline Middelink
 267                  */
 268                 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 269                         if (!capable(CAP_LINUX_IMMUTABLE))
 270                                 goto flags_out;
 271                 }
 272
 273                 /*
 274                  * The JOURNAL_DATA flag can only be changed by
 275                  * the relevant capability.
 276                  */
 277                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 278                         if (!capable(CAP_SYS_RESOURCE))
 279                                 goto flags_out;
 280                 }
 281                 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 282                         migrate = 1;
 283
 284                 if (flags & EXT4_EOFBLOCKS_FL) {
 285                         /* we don't support adding EOFBLOCKS flag */
 286                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 287                                 err = -EOPNOTSUPP;
 288                                 goto flags_out;
 289                         }
 290                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
 291                         ext4_truncate(inode);
 292
 293                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 294                 if (IS_ERR(handle)) {
 295                         err = PTR_ERR(handle);
 296                         goto flags_out;
 297                 }
 298                 if (IS_SYNC(inode))
 299                         ext4_handle_sync(handle);
 300                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 301                 if (err)
 302                         goto flags_err;
 303
 304                 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 305                         if (!(mask & EXT4_FL_USER_MODIFIABLE))
 306                                 continue;
 307                         if (mask & flags)
 308                                 ext4_set_inode_flag(inode, i);
 309                         else
 310                                 ext4_clear_inode_flag(inode, i);
 311                 }
 312
 313                 ext4_set_inode_flags(inode);
 314                 inode->i_ctime = ext4_current_time(inode);
 315
 316                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 317 flags_err:
 318                 ext4_journal_stop(handle);
 319                 if (err)
 320                         goto flags_out;
 321
 322                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 323                         err = ext4_change_inode_journal_flag(inode, jflag);
 324                 if (err)
 325                         goto flags_out;
 326                 if (migrate) {
 327                         if (flags & EXT4_EXTENTS_FL)
 328                                 err = ext4_ext_migrate(inode);
 329                         else
 330                                 err = ext4_ind_migrate(inode);
 331                 }
 332
 333 flags_out:
 334                 mutex_unlock(&inode->i_mutex);
 335                 mnt_drop_write_file(filp);
 336                 return err;
 337         }
 338         case EXT4_IOC_GETVERSION:
 339         case EXT4_IOC_GETVERSION_OLD:
 340                 return put_user(inode->i_generation, (int __user *) arg);
 341         case EXT4_IOC_SETVERSION:
 342         case EXT4_IOC_SETVERSION_OLD: {
 343                 handle_t *handle;
 344                 struct ext4_iloc iloc;
 345                 __u32 generation;
 346                 int err;
 347
 348                 if (!inode_owner_or_capable(inode))
 349                         return -EPERM;
 350
 351                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
 352                                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
 353                         ext4_warning(sb, "Setting inode version is not "
 354                                      "supported with metadata_csum enabled.");
 355                         return -ENOTTY;
 356                 }
 357
 358                 err = mnt_want_write_file(filp);
 359                 if (err)
 360                         return err;
 361                 if (get_user(generation, (int __user *) arg)) {
 362                         err = -EFAULT;
 363                         goto setversion_out;
 364                 }
 365
 366                 mutex_lock(&inode->i_mutex);
 367                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 368                 if (IS_ERR(handle)) {
 369                         err = PTR_ERR(handle);
 370                         goto unlock_out;
 371                 }
 372                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 373                 if (err == 0) {
 374                         inode->i_ctime = ext4_current_time(inode);
 375                         inode->i_generation = generation;
 376                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 377                 }
 378                 ext4_journal_stop(handle);
 379
 380 unlock_out:
 381                 mutex_unlock(&inode->i_mutex);
 382 setversion_out:
 383                 mnt_drop_write_file(filp);
 384                 return err;
 385         }
 386         case EXT4_IOC_GROUP_EXTEND: {
 387                 ext4_fsblk_t n_blocks_count;
 388                 int err, err2=0;
 389
 390                 err = ext4_resize_begin(sb);
 391                 if (err)
 392                         return err;
 393
 394                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 395                         err = -EFAULT;
 396                         goto group_extend_out;
 397                 }
 398
 399                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 400                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 401                         ext4_msg(sb, KERN_ERR,
 402                                  "Online resizing not supported with bigalloc");
 403                         err = -EOPNOTSUPP;
 404                         goto group_extend_out;
 405                 }
 406
 407                 err = mnt_want_write_file(filp);
 408                 if (err)
 409                         goto group_extend_out;
 410
 411                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 412                 if (EXT4_SB(sb)->s_journal) {
 413                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 414                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 415                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 416                 }
 417                 if (err == 0)
 418                         err = err2;
 419                 mnt_drop_write_file(filp);
 420 group_extend_out:
 421                 ext4_resize_end(sb);
 422                 return err;
 423         }
 424
 425         case EXT4_IOC_MOVE_EXT: {
 426                 struct move_extent me;
 427                 struct fd donor;
 428                 int err;
 429
 430                 if (!(filp->f_mode & FMODE_READ) ||
 431                     !(filp->f_mode & FMODE_WRITE))
 432                         return -EBADF;
 433
 434                 if (copy_from_user(&me,
 435                         (struct move_extent __user *)arg, sizeof(me)))
 436                         return -EFAULT;
 437                 me.moved_len = 0;
 438
 439                 donor = fdget(me.donor_fd);
 440                 if (!donor.file)
 441                         return -EBADF;
 442
 443                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 444                         err = -EBADF;
 445                         goto mext_out;
 446                 }
 447
 448                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 449                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 450                         ext4_msg(sb, KERN_ERR,
 451                                  "Online defrag not supported with bigalloc");
 452                         err = -EOPNOTSUPP;
 453                         goto mext_out;
 454                 }
 455
 456                 err = mnt_want_write_file(filp);
 457                 if (err)
 458                         goto mext_out;
 459
 460                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 461                                         me.donor_start, me.len, &me.moved_len);
 462                 mnt_drop_write_file(filp);
 463
 464                 if (copy_to_user((struct move_extent __user *)arg,
 465                                  &me, sizeof(me)))
 466                         err = -EFAULT;
 467 mext_out:
 468                 fdput(donor);
 469                 return err;
 470         }
 471
 472         case EXT4_IOC_GROUP_ADD: {
 473                 struct ext4_new_group_data input;
 474                 int err, err2=0;
 475
 476                 err = ext4_resize_begin(sb);
 477                 if (err)
 478                         return err;
 479
 480                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 481                                 sizeof(input))) {
 482                         err = -EFAULT;
 483                         goto group_add_out;
 484                 }
 485
 486                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 487                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 488                         ext4_msg(sb, KERN_ERR,
 489                                  "Online resizing not supported with bigalloc");
 490                         err = -EOPNOTSUPP;
 491                         goto group_add_out;
 492                 }
 493
 494                 err = mnt_want_write_file(filp);
 495                 if (err)
 496                         goto group_add_out;
 497
 498                 err = ext4_group_add(sb, &input);
 499                 if (EXT4_SB(sb)->s_journal) {
 500                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 501                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 502                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 503                 }
 504                 if (err == 0)
 505                         err = err2;
 506                 mnt_drop_write_file(filp);
 507                 if (!err && ext4_has_group_desc_csum(sb) &&
 508                     test_opt(sb, INIT_INODE_TABLE))
 509                         err = ext4_register_li_request(sb, input.group);
 510 group_add_out:
 511                 ext4_resize_end(sb);
 512                 return err;
 513         }
 514
 515         case EXT4_IOC_MIGRATE:
 516         {
 517                 int err;
 518                 if (!inode_owner_or_capable(inode))
 519                         return -EACCES;
 520
 521                 err = mnt_want_write_file(filp);
 522                 if (err)
 523                         return err;
 524                 /*
 525                  * inode_mutex prevent write and truncate on the file.
 526                  * Read still goes through. We take i_data_sem in
 527                  * ext4_ext_swap_inode_data before we switch the
 528                  * inode format to prevent read.
 529                  */
 530                 mutex_lock(&(inode->i_mutex));
 531                 err = ext4_ext_migrate(inode);
 532                 mutex_unlock(&(inode->i_mutex));
 533                 mnt_drop_write_file(filp);
 534                 return err;
 535         }
 536
 537         case EXT4_IOC_ALLOC_DA_BLKS:
 538         {
 539                 int err;
 540                 if (!inode_owner_or_capable(inode))
 541                         return -EACCES;
 542
 543                 err = mnt_want_write_file(filp);
 544                 if (err)
 545                         return err;
 546                 err = ext4_alloc_da_blocks(inode);
 547                 mnt_drop_write_file(filp);
 548                 return err;
 549         }
 550
 551         case EXT4_IOC_SWAP_BOOT:
 552                 if (!(filp->f_mode & FMODE_WRITE))
 553                         return -EBADF;
 554                 return swap_inode_boot_loader(sb, inode);
 555
 556         case EXT4_IOC_RESIZE_FS: {
 557                 ext4_fsblk_t n_blocks_count;
 558                 int err = 0, err2 = 0;
 559                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 560
 561                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 562                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 563                         ext4_msg(sb, KERN_ERR,
 564                                  "Online resizing not (yet) supported with bigalloc");
 565                         return -EOPNOTSUPP;
 566                 }
 567
 568                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 569                                    sizeof(__u64))) {
 570                         return -EFAULT;
 571                 }
 572
 573                 err = ext4_resize_begin(sb);
 574                 if (err)
 575                         return err;
 576
 577                 err = mnt_want_write_file(filp);
 578                 if (err)
 579                         goto resizefs_out;
 580
 581                 err = ext4_resize_fs(sb, n_blocks_count);
 582                 if (EXT4_SB(sb)->s_journal) {
 583                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 584                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 585                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 586                 }
 587                 if (err == 0)
 588                         err = err2;
 589                 mnt_drop_write_file(filp);
 590                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 591                     ext4_has_group_desc_csum(sb) &&
 592                     test_opt(sb, INIT_INODE_TABLE))
 593                         err = ext4_register_li_request(sb, o_group);
 594
 595 resizefs_out:
 596                 ext4_resize_end(sb);
 597                 return err;
 598         }
 599
 600         case FITRIM:
 601         {
 602                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 603                 struct fstrim_range range;
 604                 int ret = 0;
 605
 606                 if (!capable(CAP_SYS_ADMIN))
 607                         return -EPERM;
 608
 609                 if (!blk_queue_discard(q))
 610                         return -EOPNOTSUPP;
 611
 612                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 613                     sizeof(range)))
 614                         return -EFAULT;
 615
 616                 range.minlen = max((unsigned int)range.minlen,
 617                                    q->limits.discard_granularity);
 618                 ret = ext4_trim_fs(sb, &range);
 619                 if (ret < 0)
 620                         return ret;
 621
 622                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 623                     sizeof(range)))
 624                         return -EFAULT;
 625
 626                 return 0;
 627         }
 628
 629         default:
 630                 return -ENOTTY;
 631         }
 632 }
 633
 634 #ifdef CONFIG_COMPAT
 635 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 636 {
 637         /* These are just misnamed, they actually get/put from/to user an int */
 638         switch (cmd) {
 639         case EXT4_IOC32_GETFLAGS:
 640                 cmd = EXT4_IOC_GETFLAGS;
 641                 break;
 642         case EXT4_IOC32_SETFLAGS:
 643                 cmd = EXT4_IOC_SETFLAGS;
 644                 break;
 645         case EXT4_IOC32_GETVERSION:
 646                 cmd = EXT4_IOC_GETVERSION;
 647                 break;
 648         case EXT4_IOC32_SETVERSION:
 649                 cmd = EXT4_IOC_SETVERSION;
 650                 break;
 651         case EXT4_IOC32_GROUP_EXTEND:
 652                 cmd = EXT4_IOC_GROUP_EXTEND;
 653                 break;
 654         case EXT4_IOC32_GETVERSION_OLD:
 655                 cmd = EXT4_IOC_GETVERSION_OLD;
 656                 break;
 657         case EXT4_IOC32_SETVERSION_OLD:
 658                 cmd = EXT4_IOC_SETVERSION_OLD;
 659                 break;
 660         case EXT4_IOC32_GETRSVSZ:
 661                 cmd = EXT4_IOC_GETRSVSZ;
 662                 break;
 663         case EXT4_IOC32_SETRSVSZ:
 664                 cmd = EXT4_IOC_SETRSVSZ;
 665                 break;
 666         case EXT4_IOC32_GROUP_ADD: {
 667                 struct compat_ext4_new_group_input __user *uinput;
 668                 struct ext4_new_group_input input;
 669                 mm_segment_t old_fs;
 670                 int err;
 671
 672                 uinput = compat_ptr(arg);
 673                 err = get_user(input.group, &uinput->group);
 674                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 675                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 676                 err |= get_user(input.inode_table, &uinput->inode_table);
 677                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 678                 err |= get_user(input.reserved_blocks,
 679                                 &uinput->reserved_blocks);
 680                 if (err)
 681                         return -EFAULT;
 682                 old_fs = get_fs();
 683                 set_fs(KERNEL_DS);
 684                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 685                                  (unsigned long) &input);
 686                 set_fs(old_fs);
 687                 return err;
 688         }
 689         case EXT4_IOC_MOVE_EXT:
 690         case FITRIM:
 691         case EXT4_IOC_RESIZE_FS:
 692                 break;
 693         default:
 694                 return -ENOIOCTLCMD;
 695         }
 696         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 697 }
 698 #endif