Pileus Git - ~andy/linux/blob - 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;
 105         struct ext4_inode_info *ei_bl;
 106         struct ext4_sb_info *sbi;
 107
 108         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) {
 109                 err = -EINVAL;
 110                 goto swap_boot_out;
 111         }
 112
 113         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 114                 err = -EPERM;
 115                 goto swap_boot_out;
 116         }
 117
 118         sbi = EXT4_SB(sb);
 119         ei = EXT4_I(inode);
 120
 121         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 122         if (IS_ERR(inode_bl)) {
 123                 err = PTR_ERR(inode_bl);
 124                 goto swap_boot_out;
 125         }
 126         ei_bl = EXT4_I(inode_bl);
 127
 128         filemap_flush(inode->i_mapping);
 129         filemap_flush(inode_bl->i_mapping);
 130
 131         /* Protect orig inodes against a truncate and make sure,
 132          * that only 1 swap_inode_boot_loader is running. */
 133         ext4_inode_double_lock(inode, inode_bl);
 134
 135         truncate_inode_pages(&inode->i_data, 0);
 136         truncate_inode_pages(&inode_bl->i_data, 0);
 137
 138         /* Wait for all existing dio workers */
 139         ext4_inode_block_unlocked_dio(inode);
 140         ext4_inode_block_unlocked_dio(inode_bl);
 141         inode_dio_wait(inode);
 142         inode_dio_wait(inode_bl);
 143
 144         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 145         if (IS_ERR(handle)) {
 146                 err = -EINVAL;
 147                 goto swap_boot_out;
 148         }
 149
 150         /* Protect extent tree against block allocations via delalloc */
 151         ext4_double_down_write_data_sem(inode, inode_bl);
 152
 153         if (inode_bl->i_nlink == 0) {
 154                 /* this inode has never been used as a BOOT_LOADER */
 155                 set_nlink(inode_bl, 1);
 156                 i_uid_write(inode_bl, 0);
 157                 i_gid_write(inode_bl, 0);
 158                 inode_bl->i_flags = 0;
 159                 ei_bl->i_flags = 0;
 160                 inode_bl->i_version = 1;
 161                 i_size_write(inode_bl, 0);
 162                 inode_bl->i_mode = S_IFREG;
 163                 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
 164                                               EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 165                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 166                         ext4_ext_tree_init(handle, inode_bl);
 167                 } else
 168                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 169         }
 170
 171         swap_inode_data(inode, inode_bl);
 172
 173         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
 174
 175         spin_lock(&sbi->s_next_gen_lock);
 176         inode->i_generation = sbi->s_next_generation++;
 177         inode_bl->i_generation = sbi->s_next_generation++;
 178         spin_unlock(&sbi->s_next_gen_lock);
 179
 180         ext4_discard_preallocations(inode);
 181
 182         err = ext4_mark_inode_dirty(handle, inode);
 183         if (err < 0) {
 184                 ext4_warning(inode->i_sb,
 185                         "couldn't mark inode #%lu dirty (err %d)",
 186                         inode->i_ino, err);
 187                 /* Revert all changes: */
 188                 swap_inode_data(inode, inode_bl);
 189         } else {
 190                 err = ext4_mark_inode_dirty(handle, inode_bl);
 191                 if (err < 0) {
 192                         ext4_warning(inode_bl->i_sb,
 193                                 "couldn't mark inode #%lu dirty (err %d)",
 194                                 inode_bl->i_ino, err);
 195                         /* Revert all changes: */
 196                         swap_inode_data(inode, inode_bl);
 197                         ext4_mark_inode_dirty(handle, inode);
 198                 }
 199         }
 200
 201         ext4_journal_stop(handle);
 202
 203         ext4_double_up_write_data_sem(inode, inode_bl);
 204
 205         ext4_inode_resume_unlocked_dio(inode);
 206         ext4_inode_resume_unlocked_dio(inode_bl);
 207
 208         ext4_inode_double_unlock(inode, inode_bl);
 209
 210         iput(inode_bl);
 211
 212 swap_boot_out:
 213         return err;
 214 }
 215
 216 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 217 {
 218         struct inode *inode = file_inode(filp);
 219         struct super_block *sb = inode->i_sb;
 220         struct ext4_inode_info *ei = EXT4_I(inode);
 221         unsigned int flags;
 222
 223         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 224
 225         switch (cmd) {
 226         case EXT4_IOC_GETFLAGS:
 227                 ext4_get_inode_flags(ei);
 228                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 229                 return put_user(flags, (int __user *) arg);
 230         case EXT4_IOC_SETFLAGS: {
 231                 handle_t *handle = NULL;
 232                 int err, migrate = 0;
 233                 struct ext4_iloc iloc;
 234                 unsigned int oldflags, mask, i;
 235                 unsigned int jflag;
 236
 237                 if (!inode_owner_or_capable(inode))
 238                         return -EACCES;
 239
 240                 if (get_user(flags, (int __user *) arg))
 241                         return -EFAULT;
 242
 243                 err = mnt_want_write_file(filp);
 244                 if (err)
 245                         return err;
 246
 247                 flags = ext4_mask_flags(inode->i_mode, flags);
 248
 249                 err = -EPERM;
 250                 mutex_lock(&inode->i_mutex);
 251                 /* Is it quota file? Do not allow user to mess with it */
 252                 if (IS_NOQUOTA(inode))
 253                         goto flags_out;
 254
 255                 oldflags = ei->i_flags;
 256
 257                 /* The JOURNAL_DATA flag is modifiable only by root */
 258                 jflag = flags & EXT4_JOURNAL_DATA_FL;
 259
 260                 /*
 261                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 262                  * the relevant capability.
 263                  *
 264                  * This test looks nicer. Thanks to Pauline Middelink
 265                  */
 266                 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 267                         if (!capable(CAP_LINUX_IMMUTABLE))
 268                                 goto flags_out;
 269                 }
 270
 271                 /*
 272                  * The JOURNAL_DATA flag can only be changed by
 273                  * the relevant capability.
 274                  */
 275                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 276                         if (!capable(CAP_SYS_RESOURCE))
 277                                 goto flags_out;
 278                 }
 279                 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 280                         migrate = 1;
 281
 282                 if (flags & EXT4_EOFBLOCKS_FL) {
 283                         /* we don't support adding EOFBLOCKS flag */
 284                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 285                                 err = -EOPNOTSUPP;
 286                                 goto flags_out;
 287                         }
 288                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
 289                         ext4_truncate(inode);
 290
 291                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 292                 if (IS_ERR(handle)) {
 293                         err = PTR_ERR(handle);
 294                         goto flags_out;
 295                 }
 296                 if (IS_SYNC(inode))
 297                         ext4_handle_sync(handle);
 298                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 299                 if (err)
 300                         goto flags_err;
 301
 302                 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 303                         if (!(mask & EXT4_FL_USER_MODIFIABLE))
 304                                 continue;
 305                         if (mask & flags)
 306                                 ext4_set_inode_flag(inode, i);
 307                         else
 308                                 ext4_clear_inode_flag(inode, i);
 309                 }
 310
 311                 ext4_set_inode_flags(inode);
 312                 inode->i_ctime = ext4_current_time(inode);
 313
 314                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 315 flags_err:
 316                 ext4_journal_stop(handle);
 317                 if (err)
 318                         goto flags_out;
 319
 320                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 321                         err = ext4_change_inode_journal_flag(inode, jflag);
 322                 if (err)
 323                         goto flags_out;
 324                 if (migrate) {
 325                         if (flags & EXT4_EXTENTS_FL)
 326                                 err = ext4_ext_migrate(inode);
 327                         else
 328                                 err = ext4_ind_migrate(inode);
 329                 }
 330
 331 flags_out:
 332                 mutex_unlock(&inode->i_mutex);
 333                 mnt_drop_write_file(filp);
 334                 return err;
 335         }
 336         case EXT4_IOC_GETVERSION:
 337         case EXT4_IOC_GETVERSION_OLD:
 338                 return put_user(inode->i_generation, (int __user *) arg);
 339         case EXT4_IOC_SETVERSION:
 340         case EXT4_IOC_SETVERSION_OLD: {
 341                 handle_t *handle;
 342                 struct ext4_iloc iloc;
 343                 __u32 generation;
 344                 int err;
 345
 346                 if (!inode_owner_or_capable(inode))
 347                         return -EPERM;
 348
 349                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
 350                                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
 351                         ext4_warning(sb, "Setting inode version is not "
 352                                      "supported with metadata_csum enabled.");
 353                         return -ENOTTY;
 354                 }
 355
 356                 err = mnt_want_write_file(filp);
 357                 if (err)
 358                         return err;
 359                 if (get_user(generation, (int __user *) arg)) {
 360                         err = -EFAULT;
 361                         goto setversion_out;
 362                 }
 363
 364                 mutex_lock(&inode->i_mutex);
 365                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 366                 if (IS_ERR(handle)) {
 367                         err = PTR_ERR(handle);
 368                         goto unlock_out;
 369                 }
 370                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 371                 if (err == 0) {
 372                         inode->i_ctime = ext4_current_time(inode);
 373                         inode->i_generation = generation;
 374                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 375                 }
 376                 ext4_journal_stop(handle);
 377
 378 unlock_out:
 379                 mutex_unlock(&inode->i_mutex);
 380 setversion_out:
 381                 mnt_drop_write_file(filp);
 382                 return err;
 383         }
 384         case EXT4_IOC_GROUP_EXTEND: {
 385                 ext4_fsblk_t n_blocks_count;
 386                 int err, err2=0;
 387
 388                 err = ext4_resize_begin(sb);
 389                 if (err)
 390                         return err;
 391
 392                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 393                         err = -EFAULT;
 394                         goto group_extend_out;
 395                 }
 396
 397                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 398                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 399                         ext4_msg(sb, KERN_ERR,
 400                                  "Online resizing not supported with bigalloc");
 401                         err = -EOPNOTSUPP;
 402                         goto group_extend_out;
 403                 }
 404
 405                 err = mnt_want_write_file(filp);
 406                 if (err)
 407                         goto group_extend_out;
 408
 409                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 410                 if (EXT4_SB(sb)->s_journal) {
 411                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 412                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 413                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 414                 }
 415                 if (err == 0)
 416                         err = err2;
 417                 mnt_drop_write_file(filp);
 418 group_extend_out:
 419                 ext4_resize_end(sb);
 420                 return err;
 421         }
 422
 423         case EXT4_IOC_MOVE_EXT: {
 424                 struct move_extent me;
 425                 struct fd donor;
 426                 int err;
 427
 428                 if (!(filp->f_mode & FMODE_READ) ||
 429                     !(filp->f_mode & FMODE_WRITE))
 430                         return -EBADF;
 431
 432                 if (copy_from_user(&me,
 433                         (struct move_extent __user *)arg, sizeof(me)))
 434                         return -EFAULT;
 435                 me.moved_len = 0;
 436
 437                 donor = fdget(me.donor_fd);
 438                 if (!donor.file)
 439                         return -EBADF;
 440
 441                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 442                         err = -EBADF;
 443                         goto mext_out;
 444                 }
 445
 446                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 447                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 448                         ext4_msg(sb, KERN_ERR,
 449                                  "Online defrag not supported with bigalloc");
 450                         err = -EOPNOTSUPP;
 451                         goto mext_out;
 452                 }
 453
 454                 err = mnt_want_write_file(filp);
 455                 if (err)
 456                         goto mext_out;
 457
 458                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 459                                         me.donor_start, me.len, &me.moved_len);
 460                 mnt_drop_write_file(filp);
 461
 462                 if (copy_to_user((struct move_extent __user *)arg,
 463                                  &me, sizeof(me)))
 464                         err = -EFAULT;
 465 mext_out:
 466                 fdput(donor);
 467                 return err;
 468         }
 469
 470         case EXT4_IOC_GROUP_ADD: {
 471                 struct ext4_new_group_data input;
 472                 int err, err2=0;
 473
 474                 err = ext4_resize_begin(sb);
 475                 if (err)
 476                         return err;
 477
 478                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 479                                 sizeof(input))) {
 480                         err = -EFAULT;
 481                         goto group_add_out;
 482                 }
 483
 484                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 485                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 486                         ext4_msg(sb, KERN_ERR,
 487                                  "Online resizing not supported with bigalloc");
 488                         err = -EOPNOTSUPP;
 489                         goto group_add_out;
 490                 }
 491
 492                 err = mnt_want_write_file(filp);
 493                 if (err)
 494                         goto group_add_out;
 495
 496                 err = ext4_group_add(sb, &input);
 497                 if (EXT4_SB(sb)->s_journal) {
 498                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 499                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 500                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 501                 }
 502                 if (err == 0)
 503                         err = err2;
 504                 mnt_drop_write_file(filp);
 505                 if (!err && ext4_has_group_desc_csum(sb) &&
 506                     test_opt(sb, INIT_INODE_TABLE))
 507                         err = ext4_register_li_request(sb, input.group);
 508 group_add_out:
 509                 ext4_resize_end(sb);
 510                 return err;
 511         }
 512
 513         case EXT4_IOC_MIGRATE:
 514         {
 515                 int err;
 516                 if (!inode_owner_or_capable(inode))
 517                         return -EACCES;
 518
 519                 err = mnt_want_write_file(filp);
 520                 if (err)
 521                         return err;
 522                 /*
 523                  * inode_mutex prevent write and truncate on the file.
 524                  * Read still goes through. We take i_data_sem in
 525                  * ext4_ext_swap_inode_data before we switch the
 526                  * inode format to prevent read.
 527                  */
 528                 mutex_lock(&(inode->i_mutex));
 529                 err = ext4_ext_migrate(inode);
 530                 mutex_unlock(&(inode->i_mutex));
 531                 mnt_drop_write_file(filp);
 532                 return err;
 533         }
 534
 535         case EXT4_IOC_ALLOC_DA_BLKS:
 536         {
 537                 int err;
 538                 if (!inode_owner_or_capable(inode))
 539                         return -EACCES;
 540
 541                 err = mnt_want_write_file(filp);
 542                 if (err)
 543                         return err;
 544                 err = ext4_alloc_da_blocks(inode);
 545                 mnt_drop_write_file(filp);
 546                 return err;
 547         }
 548
 549         case EXT4_IOC_SWAP_BOOT:
 550                 if (!(filp->f_mode & FMODE_WRITE))
 551                         return -EBADF;
 552                 return swap_inode_boot_loader(sb, inode);
 553
 554         case EXT4_IOC_RESIZE_FS: {
 555                 ext4_fsblk_t n_blocks_count;
 556                 int err = 0, err2 = 0;
 557                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 558
 559                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 560                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 561                         ext4_msg(sb, KERN_ERR,
 562                                  "Online resizing not (yet) supported with bigalloc");
 563                         return -EOPNOTSUPP;
 564                 }
 565
 566                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 567                                    sizeof(__u64))) {
 568                         return -EFAULT;
 569                 }
 570
 571                 err = ext4_resize_begin(sb);
 572                 if (err)
 573                         return err;
 574
 575                 err = mnt_want_write_file(filp);
 576                 if (err)
 577                         goto resizefs_out;
 578
 579                 err = ext4_resize_fs(sb, n_blocks_count);
 580                 if (EXT4_SB(sb)->s_journal) {
 581                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 582                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 583                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 584                 }
 585                 if (err == 0)
 586                         err = err2;
 587                 mnt_drop_write_file(filp);
 588                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 589                     ext4_has_group_desc_csum(sb) &&
 590                     test_opt(sb, INIT_INODE_TABLE))
 591                         err = ext4_register_li_request(sb, o_group);
 592
 593 resizefs_out:
 594                 ext4_resize_end(sb);
 595                 return err;
 596         }
 597
 598         case FITRIM:
 599         {
 600                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 601                 struct fstrim_range range;
 602                 int ret = 0;
 603
 604                 if (!capable(CAP_SYS_ADMIN))
 605                         return -EPERM;
 606
 607                 if (!blk_queue_discard(q))
 608                         return -EOPNOTSUPP;
 609
 610                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 611                     sizeof(range)))
 612                         return -EFAULT;
 613
 614                 range.minlen = max((unsigned int)range.minlen,
 615                                    q->limits.discard_granularity);
 616                 ret = ext4_trim_fs(sb, &range);
 617                 if (ret < 0)
 618                         return ret;
 619
 620                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 621                     sizeof(range)))
 622                         return -EFAULT;
 623
 624                 return 0;
 625         }
 626         case EXT4_IOC_PRECACHE_EXTENTS:
 627                 return ext4_ext_precache(inode);
 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         case EXT4_IOC_PRECACHE_EXTENTS:
 693                 break;
 694         default:
 695                 return -ENOIOCTLCMD;
 696         }
 697         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 698 }
 699 #endif