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                 err = -EINVAL;
 109                 goto swap_boot_out;
 110         }
 111
 112         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 113                 err = -EPERM;
 114                 goto swap_boot_out;
 115         }
 116
 117         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 118         if (IS_ERR(inode_bl)) {
 119                 err = PTR_ERR(inode_bl);
 120                 goto swap_boot_out;
 121         }
 122         ei_bl = EXT4_I(inode_bl);
 123
 124         filemap_flush(inode->i_mapping);
 125         filemap_flush(inode_bl->i_mapping);
 126
 127         /* Protect orig inodes against a truncate and make sure,
 128          * that only 1 swap_inode_boot_loader is running. */
 129         lock_two_nondirectories(inode, inode_bl);
 130
 131         truncate_inode_pages(&inode->i_data, 0);
 132         truncate_inode_pages(&inode_bl->i_data, 0);
 133
 134         /* Wait for all existing dio workers */
 135         ext4_inode_block_unlocked_dio(inode);
 136         ext4_inode_block_unlocked_dio(inode_bl);
 137         inode_dio_wait(inode);
 138         inode_dio_wait(inode_bl);
 139
 140         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 141         if (IS_ERR(handle)) {
 142                 err = -EINVAL;
 143                 goto swap_boot_out;
 144         }
 145
 146         /* Protect extent tree against block allocations via delalloc */
 147         ext4_double_down_write_data_sem(inode, inode_bl);
 148
 149         if (inode_bl->i_nlink == 0) {
 150                 /* this inode has never been used as a BOOT_LOADER */
 151                 set_nlink(inode_bl, 1);
 152                 i_uid_write(inode_bl, 0);
 153                 i_gid_write(inode_bl, 0);
 154                 inode_bl->i_flags = 0;
 155                 ei_bl->i_flags = 0;
 156                 inode_bl->i_version = 1;
 157                 i_size_write(inode_bl, 0);
 158                 inode_bl->i_mode = S_IFREG;
 159                 if (EXT4_HAS_INCOMPAT_FEATURE(sb,
 160                                               EXT4_FEATURE_INCOMPAT_EXTENTS)) {
 161                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 162                         ext4_ext_tree_init(handle, inode_bl);
 163                 } else
 164                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 165         }
 166
 167         swap_inode_data(inode, inode_bl);
 168
 169         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
 170
 171         spin_lock(&sbi->s_next_gen_lock);
 172         inode->i_generation = sbi->s_next_generation++;
 173         inode_bl->i_generation = sbi->s_next_generation++;
 174         spin_unlock(&sbi->s_next_gen_lock);
 175
 176         ext4_discard_preallocations(inode);
 177
 178         err = ext4_mark_inode_dirty(handle, inode);
 179         if (err < 0) {
 180                 ext4_warning(inode->i_sb,
 181                         "couldn't mark inode #%lu dirty (err %d)",
 182                         inode->i_ino, err);
 183                 /* Revert all changes: */
 184                 swap_inode_data(inode, inode_bl);
 185         } else {
 186                 err = ext4_mark_inode_dirty(handle, inode_bl);
 187                 if (err < 0) {
 188                         ext4_warning(inode_bl->i_sb,
 189                                 "couldn't mark inode #%lu dirty (err %d)",
 190                                 inode_bl->i_ino, err);
 191                         /* Revert all changes: */
 192                         swap_inode_data(inode, inode_bl);
 193                         ext4_mark_inode_dirty(handle, inode);
 194                 }
 195         }
 196
 197         ext4_journal_stop(handle);
 198
 199         ext4_double_up_write_data_sem(inode, inode_bl);
 200
 201         ext4_inode_resume_unlocked_dio(inode);
 202         ext4_inode_resume_unlocked_dio(inode_bl);
 203
 204         unlock_two_nondirectories(inode, inode_bl);
 205
 206         iput(inode_bl);
 207
 208 swap_boot_out:
 209         return err;
 210 }
 211
 212 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 213 {
 214         struct inode *inode = file_inode(filp);
 215         struct super_block *sb = inode->i_sb;
 216         struct ext4_inode_info *ei = EXT4_I(inode);
 217         unsigned int flags;
 218
 219         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 220
 221         switch (cmd) {
 222         case EXT4_IOC_GETFLAGS:
 223                 ext4_get_inode_flags(ei);
 224                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 225                 return put_user(flags, (int __user *) arg);
 226         case EXT4_IOC_SETFLAGS: {
 227                 handle_t *handle = NULL;
 228                 int err, migrate = 0;
 229                 struct ext4_iloc iloc;
 230                 unsigned int oldflags, mask, i;
 231                 unsigned int jflag;
 232
 233                 if (!inode_owner_or_capable(inode))
 234                         return -EACCES;
 235
 236                 if (get_user(flags, (int __user *) arg))
 237                         return -EFAULT;
 238
 239                 err = mnt_want_write_file(filp);
 240                 if (err)
 241                         return err;
 242
 243                 flags = ext4_mask_flags(inode->i_mode, flags);
 244
 245                 err = -EPERM;
 246                 mutex_lock(&inode->i_mutex);
 247                 /* Is it quota file? Do not allow user to mess with it */
 248                 if (IS_NOQUOTA(inode))
 249                         goto flags_out;
 250
 251                 oldflags = ei->i_flags;
 252
 253                 /* The JOURNAL_DATA flag is modifiable only by root */
 254                 jflag = flags & EXT4_JOURNAL_DATA_FL;
 255
 256                 /*
 257                  * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 258                  * the relevant capability.
 259                  *
 260                  * This test looks nicer. Thanks to Pauline Middelink
 261                  */
 262                 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 263                         if (!capable(CAP_LINUX_IMMUTABLE))
 264                                 goto flags_out;
 265                 }
 266
 267                 /*
 268                  * The JOURNAL_DATA flag can only be changed by
 269                  * the relevant capability.
 270                  */
 271                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 272                         if (!capable(CAP_SYS_RESOURCE))
 273                                 goto flags_out;
 274                 }
 275                 if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 276                         migrate = 1;
 277
 278                 if (flags & EXT4_EOFBLOCKS_FL) {
 279                         /* we don't support adding EOFBLOCKS flag */
 280                         if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 281                                 err = -EOPNOTSUPP;
 282                                 goto flags_out;
 283                         }
 284                 } else if (oldflags & EXT4_EOFBLOCKS_FL)
 285                         ext4_truncate(inode);
 286
 287                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 288                 if (IS_ERR(handle)) {
 289                         err = PTR_ERR(handle);
 290                         goto flags_out;
 291                 }
 292                 if (IS_SYNC(inode))
 293                         ext4_handle_sync(handle);
 294                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 295                 if (err)
 296                         goto flags_err;
 297
 298                 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 299                         if (!(mask & EXT4_FL_USER_MODIFIABLE))
 300                                 continue;
 301                         if (mask & flags)
 302                                 ext4_set_inode_flag(inode, i);
 303                         else
 304                                 ext4_clear_inode_flag(inode, i);
 305                 }
 306
 307                 ext4_set_inode_flags(inode);
 308                 inode->i_ctime = ext4_current_time(inode);
 309
 310                 err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 311 flags_err:
 312                 ext4_journal_stop(handle);
 313                 if (err)
 314                         goto flags_out;
 315
 316                 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 317                         err = ext4_change_inode_journal_flag(inode, jflag);
 318                 if (err)
 319                         goto flags_out;
 320                 if (migrate) {
 321                         if (flags & EXT4_EXTENTS_FL)
 322                                 err = ext4_ext_migrate(inode);
 323                         else
 324                                 err = ext4_ind_migrate(inode);
 325                 }
 326
 327 flags_out:
 328                 mutex_unlock(&inode->i_mutex);
 329                 mnt_drop_write_file(filp);
 330                 return err;
 331         }
 332         case EXT4_IOC_GETVERSION:
 333         case EXT4_IOC_GETVERSION_OLD:
 334                 return put_user(inode->i_generation, (int __user *) arg);
 335         case EXT4_IOC_SETVERSION:
 336         case EXT4_IOC_SETVERSION_OLD: {
 337                 handle_t *handle;
 338                 struct ext4_iloc iloc;
 339                 __u32 generation;
 340                 int err;
 341
 342                 if (!inode_owner_or_capable(inode))
 343                         return -EPERM;
 344
 345                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
 346                                 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) {
 347                         ext4_warning(sb, "Setting inode version is not "
 348                                      "supported with metadata_csum enabled.");
 349                         return -ENOTTY;
 350                 }
 351
 352                 err = mnt_want_write_file(filp);
 353                 if (err)
 354                         return err;
 355                 if (get_user(generation, (int __user *) arg)) {
 356                         err = -EFAULT;
 357                         goto setversion_out;
 358                 }
 359
 360                 mutex_lock(&inode->i_mutex);
 361                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 362                 if (IS_ERR(handle)) {
 363                         err = PTR_ERR(handle);
 364                         goto unlock_out;
 365                 }
 366                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 367                 if (err == 0) {
 368                         inode->i_ctime = ext4_current_time(inode);
 369                         inode->i_generation = generation;
 370                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 371                 }
 372                 ext4_journal_stop(handle);
 373
 374 unlock_out:
 375                 mutex_unlock(&inode->i_mutex);
 376 setversion_out:
 377                 mnt_drop_write_file(filp);
 378                 return err;
 379         }
 380         case EXT4_IOC_GROUP_EXTEND: {
 381                 ext4_fsblk_t n_blocks_count;
 382                 int err, err2=0;
 383
 384                 err = ext4_resize_begin(sb);
 385                 if (err)
 386                         return err;
 387
 388                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 389                         err = -EFAULT;
 390                         goto group_extend_out;
 391                 }
 392
 393                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 394                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 395                         ext4_msg(sb, KERN_ERR,
 396                                  "Online resizing not supported with bigalloc");
 397                         err = -EOPNOTSUPP;
 398                         goto group_extend_out;
 399                 }
 400
 401                 err = mnt_want_write_file(filp);
 402                 if (err)
 403                         goto group_extend_out;
 404
 405                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 406                 if (EXT4_SB(sb)->s_journal) {
 407                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 408                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 409                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 410                 }
 411                 if (err == 0)
 412                         err = err2;
 413                 mnt_drop_write_file(filp);
 414 group_extend_out:
 415                 ext4_resize_end(sb);
 416                 return err;
 417         }
 418
 419         case EXT4_IOC_MOVE_EXT: {
 420                 struct move_extent me;
 421                 struct fd donor;
 422                 int err;
 423
 424                 if (!(filp->f_mode & FMODE_READ) ||
 425                     !(filp->f_mode & FMODE_WRITE))
 426                         return -EBADF;
 427
 428                 if (copy_from_user(&me,
 429                         (struct move_extent __user *)arg, sizeof(me)))
 430                         return -EFAULT;
 431                 me.moved_len = 0;
 432
 433                 donor = fdget(me.donor_fd);
 434                 if (!donor.file)
 435                         return -EBADF;
 436
 437                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 438                         err = -EBADF;
 439                         goto mext_out;
 440                 }
 441
 442                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 443                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 444                         ext4_msg(sb, KERN_ERR,
 445                                  "Online defrag not supported with bigalloc");
 446                         err = -EOPNOTSUPP;
 447                         goto mext_out;
 448                 }
 449
 450                 err = mnt_want_write_file(filp);
 451                 if (err)
 452                         goto mext_out;
 453
 454                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 455                                         me.donor_start, me.len, &me.moved_len);
 456                 mnt_drop_write_file(filp);
 457
 458                 if (copy_to_user((struct move_extent __user *)arg,
 459                                  &me, sizeof(me)))
 460                         err = -EFAULT;
 461 mext_out:
 462                 fdput(donor);
 463                 return err;
 464         }
 465
 466         case EXT4_IOC_GROUP_ADD: {
 467                 struct ext4_new_group_data input;
 468                 int err, err2=0;
 469
 470                 err = ext4_resize_begin(sb);
 471                 if (err)
 472                         return err;
 473
 474                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 475                                 sizeof(input))) {
 476                         err = -EFAULT;
 477                         goto group_add_out;
 478                 }
 479
 480                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 481                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 482                         ext4_msg(sb, KERN_ERR,
 483                                  "Online resizing not supported with bigalloc");
 484                         err = -EOPNOTSUPP;
 485                         goto group_add_out;
 486                 }
 487
 488                 err = mnt_want_write_file(filp);
 489                 if (err)
 490                         goto group_add_out;
 491
 492                 err = ext4_group_add(sb, &input);
 493                 if (EXT4_SB(sb)->s_journal) {
 494                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 495                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 496                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 497                 }
 498                 if (err == 0)
 499                         err = err2;
 500                 mnt_drop_write_file(filp);
 501                 if (!err && ext4_has_group_desc_csum(sb) &&
 502                     test_opt(sb, INIT_INODE_TABLE))
 503                         err = ext4_register_li_request(sb, input.group);
 504 group_add_out:
 505                 ext4_resize_end(sb);
 506                 return err;
 507         }
 508
 509         case EXT4_IOC_MIGRATE:
 510         {
 511                 int err;
 512                 if (!inode_owner_or_capable(inode))
 513                         return -EACCES;
 514
 515                 err = mnt_want_write_file(filp);
 516                 if (err)
 517                         return err;
 518                 /*
 519                  * inode_mutex prevent write and truncate on the file.
 520                  * Read still goes through. We take i_data_sem in
 521                  * ext4_ext_swap_inode_data before we switch the
 522                  * inode format to prevent read.
 523                  */
 524                 mutex_lock(&(inode->i_mutex));
 525                 err = ext4_ext_migrate(inode);
 526                 mutex_unlock(&(inode->i_mutex));
 527                 mnt_drop_write_file(filp);
 528                 return err;
 529         }
 530
 531         case EXT4_IOC_ALLOC_DA_BLKS:
 532         {
 533                 int err;
 534                 if (!inode_owner_or_capable(inode))
 535                         return -EACCES;
 536
 537                 err = mnt_want_write_file(filp);
 538                 if (err)
 539                         return err;
 540                 err = ext4_alloc_da_blocks(inode);
 541                 mnt_drop_write_file(filp);
 542                 return err;
 543         }
 544
 545         case EXT4_IOC_SWAP_BOOT:
 546                 if (!(filp->f_mode & FMODE_WRITE))
 547                         return -EBADF;
 548                 return swap_inode_boot_loader(sb, inode);
 549
 550         case EXT4_IOC_RESIZE_FS: {
 551                 ext4_fsblk_t n_blocks_count;
 552                 int err = 0, err2 = 0;
 553                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 554
 555                 if (EXT4_HAS_RO_COMPAT_FEATURE(sb,
 556                                EXT4_FEATURE_RO_COMPAT_BIGALLOC)) {
 557                         ext4_msg(sb, KERN_ERR,
 558                                  "Online resizing not (yet) supported with bigalloc");
 559                         return -EOPNOTSUPP;
 560                 }
 561
 562                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 563                                    sizeof(__u64))) {
 564                         return -EFAULT;
 565                 }
 566
 567                 err = ext4_resize_begin(sb);
 568                 if (err)
 569                         return err;
 570
 571                 err = mnt_want_write_file(filp);
 572                 if (err)
 573                         goto resizefs_out;
 574
 575                 err = ext4_resize_fs(sb, n_blocks_count);
 576                 if (EXT4_SB(sb)->s_journal) {
 577                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 578                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 579                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 580                 }
 581                 if (err == 0)
 582                         err = err2;
 583                 mnt_drop_write_file(filp);
 584                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 585                     ext4_has_group_desc_csum(sb) &&
 586                     test_opt(sb, INIT_INODE_TABLE))
 587                         err = ext4_register_li_request(sb, o_group);
 588
 589 resizefs_out:
 590                 ext4_resize_end(sb);
 591                 return err;
 592         }
 593
 594         case FITRIM:
 595         {
 596                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 597                 struct fstrim_range range;
 598                 int ret = 0;
 599
 600                 if (!capable(CAP_SYS_ADMIN))
 601                         return -EPERM;
 602
 603                 if (!blk_queue_discard(q))
 604                         return -EOPNOTSUPP;
 605
 606                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 607                     sizeof(range)))
 608                         return -EFAULT;
 609
 610                 range.minlen = max((unsigned int)range.minlen,
 611                                    q->limits.discard_granularity);
 612                 ret = ext4_trim_fs(sb, &range);
 613                 if (ret < 0)
 614                         return ret;
 615
 616                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 617                     sizeof(range)))
 618                         return -EFAULT;
 619
 620                 return 0;
 621         }
 622         case EXT4_IOC_PRECACHE_EXTENTS:
 623                 return ext4_ext_precache(inode);
 624
 625         default:
 626                 return -ENOTTY;
 627         }
 628 }
 629
 630 #ifdef CONFIG_COMPAT
 631 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 632 {
 633         /* These are just misnamed, they actually get/put from/to user an int */
 634         switch (cmd) {
 635         case EXT4_IOC32_GETFLAGS:
 636                 cmd = EXT4_IOC_GETFLAGS;
 637                 break;
 638         case EXT4_IOC32_SETFLAGS:
 639                 cmd = EXT4_IOC_SETFLAGS;
 640                 break;
 641         case EXT4_IOC32_GETVERSION:
 642                 cmd = EXT4_IOC_GETVERSION;
 643                 break;
 644         case EXT4_IOC32_SETVERSION:
 645                 cmd = EXT4_IOC_SETVERSION;
 646                 break;
 647         case EXT4_IOC32_GROUP_EXTEND:
 648                 cmd = EXT4_IOC_GROUP_EXTEND;
 649                 break;
 650         case EXT4_IOC32_GETVERSION_OLD:
 651                 cmd = EXT4_IOC_GETVERSION_OLD;
 652                 break;
 653         case EXT4_IOC32_SETVERSION_OLD:
 654                 cmd = EXT4_IOC_SETVERSION_OLD;
 655                 break;
 656         case EXT4_IOC32_GETRSVSZ:
 657                 cmd = EXT4_IOC_GETRSVSZ;
 658                 break;
 659         case EXT4_IOC32_SETRSVSZ:
 660                 cmd = EXT4_IOC_SETRSVSZ;
 661                 break;
 662         case EXT4_IOC32_GROUP_ADD: {
 663                 struct compat_ext4_new_group_input __user *uinput;
 664                 struct ext4_new_group_input input;
 665                 mm_segment_t old_fs;
 666                 int err;
 667
 668                 uinput = compat_ptr(arg);
 669                 err = get_user(input.group, &uinput->group);
 670                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 671                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 672                 err |= get_user(input.inode_table, &uinput->inode_table);
 673                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 674                 err |= get_user(input.reserved_blocks,
 675                                 &uinput->reserved_blocks);
 676                 if (err)
 677                         return -EFAULT;
 678                 old_fs = get_fs();
 679                 set_fs(KERNEL_DS);
 680                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 681                                  (unsigned long) &input);
 682                 set_fs(old_fs);
 683                 return err;
 684         }
 685         case EXT4_IOC_MOVE_EXT:
 686         case FITRIM:
 687         case EXT4_IOC_RESIZE_FS:
 688         case EXT4_IOC_PRECACHE_EXTENTS:
 689                 break;
 690         default:
 691                 return -ENOIOCTLCMD;
 692         }
 693         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 694 }
 695 #endif