fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.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 <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/uuid.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/delay.h>
  22 #include <linux/iversion.h>
  23 #include "ext4_jbd2.h"
  24 #include "ext4.h"
  25 #include <linux/fsmap.h>
  26 #include "fsmap.h"
  27 #include <trace/events/ext4.h>
  28
  29 /**
  30  * Swap memory between @a and @b for @len bytes.
  31  *
  32  * @a:          pointer to first memory area
  33  * @b:          pointer to second memory area
  34  * @len:        number of bytes to swap
  35  *
  36  */
  37 static void memswap(void *a, void *b, size_t len)
  38 {
  39         unsigned char *ap, *bp;
  40
  41         ap = (unsigned char *)a;
  42         bp = (unsigned char *)b;
  43         while (len-- > 0) {
  44                 swap(*ap, *bp);
  45                 ap++;
  46                 bp++;
  47         }
  48 }
  49
  50 /**
  51  * Swap i_data and associated attributes between @inode1 and @inode2.
  52  * This function is used for the primary swap between inode1 and inode2
  53  * and also to revert this primary swap in case of errors.
  54  *
  55  * Therefore you have to make sure, that calling this method twice
  56  * will revert all changes.
  57  *
  58  * @inode1:     pointer to first inode
  59  * @inode2:     pointer to second inode
  60  */
  61 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  62 {
  63         loff_t isize;
  64         struct ext4_inode_info *ei1;
  65         struct ext4_inode_info *ei2;
  66         unsigned long tmp;
  67
  68         ei1 = EXT4_I(inode1);
  69         ei2 = EXT4_I(inode2);
  70
  71         swap(inode1->i_version, inode2->i_version);
  72         swap(inode1->i_atime, inode2->i_atime);
  73         swap(inode1->i_mtime, inode2->i_mtime);
  74
  75         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  76         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
  77         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
  78                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
  79         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
  80         swap(ei1->i_disksize, ei2->i_disksize);
  81         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  82         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  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 static void reset_inode_seed(struct inode *inode)
  90 {
  91         struct ext4_inode_info *ei = EXT4_I(inode);
  92         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
  93         __le32 inum = cpu_to_le32(inode->i_ino);
  94         __le32 gen = cpu_to_le32(inode->i_generation);
  95         __u32 csum;
  96
  97         if (!ext4_has_metadata_csum(inode->i_sb))
  98                 return;
  99
 100         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 101         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 102 }
 103
 104 /**
 105  * Swap the information from the given @inode and the inode
 106  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 107  * important fields of the inodes.
 108  *
 109  * @sb:         the super block of the filesystem
 110  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 111  *
 112  */
 113 static long swap_inode_boot_loader(struct super_block *sb,
 114                                 struct inode *inode)
 115 {
 116         handle_t *handle;
 117         int err;
 118         struct inode *inode_bl;
 119         struct ext4_inode_info *ei_bl;
 120         qsize_t size, size_bl, diff;
 121         blkcnt_t blocks;
 122         unsigned short bytes;
 123
 124         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 125         if (IS_ERR(inode_bl))
 126                 return PTR_ERR(inode_bl);
 127         ei_bl = EXT4_I(inode_bl);
 128
 129         /* Protect orig inodes against a truncate and make sure,
 130          * that only 1 swap_inode_boot_loader is running. */
 131         lock_two_nondirectories(inode, inode_bl);
 132
 133         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 134             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 135             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 136             ext4_has_inline_data(inode)) {
 137                 err = -EINVAL;
 138                 goto journal_err_out;
 139         }
 140
 141         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 142             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 143                 err = -EPERM;
 144                 goto journal_err_out;
 145         }
 146
 147         down_write(&EXT4_I(inode)->i_mmap_sem);
 148         err = filemap_write_and_wait(inode->i_mapping);
 149         if (err)
 150                 goto err_out;
 151
 152         err = filemap_write_and_wait(inode_bl->i_mapping);
 153         if (err)
 154                 goto err_out;
 155
 156         /* Wait for all existing dio workers */
 157         inode_dio_wait(inode);
 158         inode_dio_wait(inode_bl);
 159
 160         truncate_inode_pages(&inode->i_data, 0);
 161         truncate_inode_pages(&inode_bl->i_data, 0);
 162
 163         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 164         if (IS_ERR(handle)) {
 165                 err = -EINVAL;
 166                 goto err_out;
 167         }
 168
 169         /* Protect extent tree against block allocations via delalloc */
 170         ext4_double_down_write_data_sem(inode, inode_bl);
 171
 172         if (inode_bl->i_nlink == 0) {
 173                 /* this inode has never been used as a BOOT_LOADER */
 174                 set_nlink(inode_bl, 1);
 175                 i_uid_write(inode_bl, 0);
 176                 i_gid_write(inode_bl, 0);
 177                 inode_bl->i_flags = 0;
 178                 ei_bl->i_flags = 0;
 179                 inode_set_iversion(inode_bl, 1);
 180                 i_size_write(inode_bl, 0);
 181                 inode_bl->i_mode = S_IFREG;
 182                 if (ext4_has_feature_extents(sb)) {
 183                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 184                         ext4_ext_tree_init(handle, inode_bl);
 185                 } else
 186                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 187         }
 188
 189         err = dquot_initialize(inode);
 190         if (err)
 191                 goto err_out1;
 192
 193         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 194         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 195         diff = size - size_bl;
 196         swap_inode_data(inode, inode_bl);
 197
 198         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 199
 200         inode->i_generation = prandom_u32();
 201         inode_bl->i_generation = prandom_u32();
 202         reset_inode_seed(inode);
 203         reset_inode_seed(inode_bl);
 204
 205         ext4_discard_preallocations(inode);
 206
 207         err = ext4_mark_inode_dirty(handle, inode);
 208         if (err < 0) {
 209                 /* No need to update quota information. */
 210                 ext4_warning(inode->i_sb,
 211                         "couldn't mark inode #%lu dirty (err %d)",
 212                         inode->i_ino, err);
 213                 /* Revert all changes: */
 214                 swap_inode_data(inode, inode_bl);
 215                 ext4_mark_inode_dirty(handle, inode);
 216                 goto err_out1;
 217         }
 218
 219         blocks = inode_bl->i_blocks;
 220         bytes = inode_bl->i_bytes;
 221         inode_bl->i_blocks = inode->i_blocks;
 222         inode_bl->i_bytes = inode->i_bytes;
 223         err = ext4_mark_inode_dirty(handle, inode_bl);
 224         if (err < 0) {
 225                 /* No need to update quota information. */
 226                 ext4_warning(inode_bl->i_sb,
 227                         "couldn't mark inode #%lu dirty (err %d)",
 228                         inode_bl->i_ino, err);
 229                 goto revert;
 230         }
 231
 232         /* Bootloader inode should not be counted into quota information. */
 233         if (diff > 0)
 234                 dquot_free_space(inode, diff);
 235         else
 236                 err = dquot_alloc_space(inode, -1 * diff);
 237
 238         if (err < 0) {
 239 revert:
 240                 /* Revert all changes: */
 241                 inode_bl->i_blocks = blocks;
 242                 inode_bl->i_bytes = bytes;
 243                 swap_inode_data(inode, inode_bl);
 244                 ext4_mark_inode_dirty(handle, inode);
 245                 ext4_mark_inode_dirty(handle, inode_bl);
 246         }
 247
 248 err_out1:
 249         ext4_journal_stop(handle);
 250         ext4_double_up_write_data_sem(inode, inode_bl);
 251
 252 err_out:
 253         up_write(&EXT4_I(inode)->i_mmap_sem);
 254 journal_err_out:
 255         unlock_two_nondirectories(inode, inode_bl);
 256         iput(inode_bl);
 257         return err;
 258 }
 259
 260 #ifdef CONFIG_FS_ENCRYPTION
 261 static int uuid_is_zero(__u8 u[16])
 262 {
 263         int     i;
 264
 265         for (i = 0; i < 16; i++)
 266                 if (u[i])
 267                         return 0;
 268         return 1;
 269 }
 270 #endif
 271
 272 /*
 273  * If immutable is set and we are not clearing it, we're not allowed to change
 274  * anything else in the inode.  Don't error out if we're only trying to set
 275  * immutable on an immutable file.
 276  */
 277 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 278                                       unsigned int flags)
 279 {
 280         struct ext4_inode_info *ei = EXT4_I(inode);
 281         unsigned int oldflags = ei->i_flags;
 282
 283         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 284                 return 0;
 285
 286         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 287                 return -EPERM;
 288         if (ext4_has_feature_project(inode->i_sb) &&
 289             __kprojid_val(ei->i_projid) != new_projid)
 290                 return -EPERM;
 291
 292         return 0;
 293 }
 294
 295 static int ext4_ioctl_setflags(struct inode *inode,
 296                                unsigned int flags)
 297 {
 298         struct ext4_inode_info *ei = EXT4_I(inode);
 299         handle_t *handle = NULL;
 300         int err = -EPERM, migrate = 0;
 301         struct ext4_iloc iloc;
 302         unsigned int oldflags, mask, i;
 303         unsigned int jflag;
 304         struct super_block *sb = inode->i_sb;
 305
 306         /* Is it quota file? Do not allow user to mess with it */
 307         if (ext4_is_quota_file(inode))
 308                 goto flags_out;
 309
 310         oldflags = ei->i_flags;
 311
 312         /* The JOURNAL_DATA flag is modifiable only by root */
 313         jflag = flags & EXT4_JOURNAL_DATA_FL;
 314
 315         /*
 316          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 317          * the relevant capability.
 318          *
 319          * This test looks nicer. Thanks to Pauline Middelink
 320          */
 321         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 322                 if (!capable(CAP_LINUX_IMMUTABLE))
 323                         goto flags_out;
 324         }
 325
 326         /*
 327          * The JOURNAL_DATA flag can only be changed by
 328          * the relevant capability.
 329          */
 330         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 331                 if (!capable(CAP_SYS_RESOURCE))
 332                         goto flags_out;
 333         }
 334         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 335                 migrate = 1;
 336
 337         if (flags & EXT4_EOFBLOCKS_FL) {
 338                 /* we don't support adding EOFBLOCKS flag */
 339                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 340                         err = -EOPNOTSUPP;
 341                         goto flags_out;
 342                 }
 343         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 344                 err = ext4_truncate(inode);
 345                 if (err)
 346                         goto flags_out;
 347         }
 348
 349         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 350                 if (!ext4_has_feature_casefold(sb)) {
 351                         err = -EOPNOTSUPP;
 352                         goto flags_out;
 353                 }
 354
 355                 if (!S_ISDIR(inode->i_mode)) {
 356                         err = -ENOTDIR;
 357                         goto flags_out;
 358                 }
 359
 360                 if (!ext4_empty_dir(inode)) {
 361                         err = -ENOTEMPTY;
 362                         goto flags_out;
 363                 }
 364         }
 365
 366         /*
 367          * Wait for all pending directio and then flush all the dirty pages
 368          * for this file.  The flush marks all the pages readonly, so any
 369          * subsequent attempt to write to the file (particularly mmap pages)
 370          * will come through the filesystem and fail.
 371          */
 372         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 373             (flags & EXT4_IMMUTABLE_FL)) {
 374                 inode_dio_wait(inode);
 375                 err = filemap_write_and_wait(inode->i_mapping);
 376                 if (err)
 377                         goto flags_out;
 378         }
 379
 380         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 381         if (IS_ERR(handle)) {
 382                 err = PTR_ERR(handle);
 383                 goto flags_out;
 384         }
 385         if (IS_SYNC(inode))
 386                 ext4_handle_sync(handle);
 387         err = ext4_reserve_inode_write(handle, inode, &iloc);
 388         if (err)
 389                 goto flags_err;
 390
 391         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 392                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 393                         continue;
 394                 /* These flags get special treatment later */
 395                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 396                         continue;
 397                 if (mask & flags)
 398                         ext4_set_inode_flag(inode, i);
 399                 else
 400                         ext4_clear_inode_flag(inode, i);
 401         }
 402
 403         ext4_set_inode_flags(inode);
 404         inode->i_ctime = current_time(inode);
 405
 406         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 407 flags_err:
 408         ext4_journal_stop(handle);
 409         if (err)
 410                 goto flags_out;
 411
 412         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 413                 /*
 414                  * Changes to the journaling mode can cause unsafe changes to
 415                  * S_DAX if we are using the DAX mount option.
 416                  */
 417                 if (test_opt(inode->i_sb, DAX)) {
 418                         err = -EBUSY;
 419                         goto flags_out;
 420                 }
 421
 422                 err = ext4_change_inode_journal_flag(inode, jflag);
 423                 if (err)
 424                         goto flags_out;
 425         }
 426         if (migrate) {
 427                 if (flags & EXT4_EXTENTS_FL)
 428                         err = ext4_ext_migrate(inode);
 429                 else
 430                         err = ext4_ind_migrate(inode);
 431         }
 432
 433 flags_out:
 434         return err;
 435 }
 436
 437 #ifdef CONFIG_QUOTA
 438 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 439 {
 440         struct inode *inode = file_inode(filp);
 441         struct super_block *sb = inode->i_sb;
 442         struct ext4_inode_info *ei = EXT4_I(inode);
 443         int err, rc;
 444         handle_t *handle;
 445         kprojid_t kprojid;
 446         struct ext4_iloc iloc;
 447         struct ext4_inode *raw_inode;
 448         struct dquot *transfer_to[MAXQUOTAS] = { };
 449
 450         if (!ext4_has_feature_project(sb)) {
 451                 if (projid != EXT4_DEF_PROJID)
 452                         return -EOPNOTSUPP;
 453                 else
 454                         return 0;
 455         }
 456
 457         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 458                 return -EOPNOTSUPP;
 459
 460         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 461
 462         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 463                 return 0;
 464
 465         err = -EPERM;
 466         /* Is it quota file? Do not allow user to mess with it */
 467         if (ext4_is_quota_file(inode))
 468                 return err;
 469
 470         err = ext4_get_inode_loc(inode, &iloc);
 471         if (err)
 472                 return err;
 473
 474         raw_inode = ext4_raw_inode(&iloc);
 475         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 476                 err = ext4_expand_extra_isize(inode,
 477                                               EXT4_SB(sb)->s_want_extra_isize,
 478                                               &iloc);
 479                 if (err)
 480                         return err;
 481         } else {
 482                 brelse(iloc.bh);
 483         }
 484
 485         err = dquot_initialize(inode);
 486         if (err)
 487                 return err;
 488
 489         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 490                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 491                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 492         if (IS_ERR(handle))
 493                 return PTR_ERR(handle);
 494
 495         err = ext4_reserve_inode_write(handle, inode, &iloc);
 496         if (err)
 497                 goto out_stop;
 498
 499         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 500         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 501
 502                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 503                  * counts xattr inode references.
 504                  */
 505                 down_read(&EXT4_I(inode)->xattr_sem);
 506                 err = __dquot_transfer(inode, transfer_to);
 507                 up_read(&EXT4_I(inode)->xattr_sem);
 508                 dqput(transfer_to[PRJQUOTA]);
 509                 if (err)
 510                         goto out_dirty;
 511         }
 512
 513         EXT4_I(inode)->i_projid = kprojid;
 514         inode->i_ctime = current_time(inode);
 515 out_dirty:
 516         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 517         if (!err)
 518                 err = rc;
 519 out_stop:
 520         ext4_journal_stop(handle);
 521         return err;
 522 }
 523 #else
 524 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 525 {
 526         if (projid != EXT4_DEF_PROJID)
 527                 return -EOPNOTSUPP;
 528         return 0;
 529 }
 530 #endif
 531
 532 /* Transfer internal flags to xflags */
 533 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 534 {
 535         __u32 xflags = 0;
 536
 537         if (iflags & EXT4_SYNC_FL)
 538                 xflags |= FS_XFLAG_SYNC;
 539         if (iflags & EXT4_IMMUTABLE_FL)
 540                 xflags |= FS_XFLAG_IMMUTABLE;
 541         if (iflags & EXT4_APPEND_FL)
 542                 xflags |= FS_XFLAG_APPEND;
 543         if (iflags & EXT4_NODUMP_FL)
 544                 xflags |= FS_XFLAG_NODUMP;
 545         if (iflags & EXT4_NOATIME_FL)
 546                 xflags |= FS_XFLAG_NOATIME;
 547         if (iflags & EXT4_PROJINHERIT_FL)
 548                 xflags |= FS_XFLAG_PROJINHERIT;
 549         return xflags;
 550 }
 551
 552 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 553                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 554                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 555
 556 /* Transfer xflags flags to internal */
 557 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 558 {
 559         unsigned long iflags = 0;
 560
 561         if (xflags & FS_XFLAG_SYNC)
 562                 iflags |= EXT4_SYNC_FL;
 563         if (xflags & FS_XFLAG_IMMUTABLE)
 564                 iflags |= EXT4_IMMUTABLE_FL;
 565         if (xflags & FS_XFLAG_APPEND)
 566                 iflags |= EXT4_APPEND_FL;
 567         if (xflags & FS_XFLAG_NODUMP)
 568                 iflags |= EXT4_NODUMP_FL;
 569         if (xflags & FS_XFLAG_NOATIME)
 570                 iflags |= EXT4_NOATIME_FL;
 571         if (xflags & FS_XFLAG_PROJINHERIT)
 572                 iflags |= EXT4_PROJINHERIT_FL;
 573
 574         return iflags;
 575 }
 576
 577 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 578 {
 579         struct ext4_sb_info *sbi = EXT4_SB(sb);
 580         __u32 flags;
 581
 582         if (!capable(CAP_SYS_ADMIN))
 583                 return -EPERM;
 584
 585         if (get_user(flags, (__u32 __user *)arg))
 586                 return -EFAULT;
 587
 588         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 589                 return -EINVAL;
 590
 591         if (ext4_forced_shutdown(sbi))
 592                 return 0;
 593
 594         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 595         trace_ext4_shutdown(sb, flags);
 596
 597         switch (flags) {
 598         case EXT4_GOING_FLAGS_DEFAULT:
 599                 freeze_bdev(sb->s_bdev);
 600                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 601                 thaw_bdev(sb->s_bdev, sb);
 602                 break;
 603         case EXT4_GOING_FLAGS_LOGFLUSH:
 604                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 605                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 606                         (void) ext4_force_commit(sb);
 607                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 608                 }
 609                 break;
 610         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 611                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 612                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 613                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 614                 break;
 615         default:
 616                 return -EINVAL;
 617         }
 618         clear_opt(sb, DISCARD);
 619         return 0;
 620 }
 621
 622 struct getfsmap_info {
 623         struct super_block      *gi_sb;
 624         struct fsmap_head __user *gi_data;
 625         unsigned int            gi_idx;
 626         __u32                   gi_last_flags;
 627 };
 628
 629 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 630 {
 631         struct getfsmap_info *info = priv;
 632         struct fsmap fm;
 633
 634         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 635
 636         info->gi_last_flags = xfm->fmr_flags;
 637         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 638         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 639                         sizeof(struct fsmap)))
 640                 return -EFAULT;
 641
 642         return 0;
 643 }
 644
 645 static int ext4_ioc_getfsmap(struct super_block *sb,
 646                              struct fsmap_head __user *arg)
 647 {
 648         struct getfsmap_info info = { NULL };
 649         struct ext4_fsmap_head xhead = {0};
 650         struct fsmap_head head;
 651         bool aborted = false;
 652         int error;
 653
 654         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 655                 return -EFAULT;
 656         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 657             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 658                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 659             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 660                        sizeof(head.fmh_keys[1].fmr_reserved)))
 661                 return -EINVAL;
 662         /*
 663          * ext4 doesn't report file extents at all, so the only valid
 664          * file offsets are the magic ones (all zeroes or all ones).
 665          */
 666         if (head.fmh_keys[0].fmr_offset ||
 667             (head.fmh_keys[1].fmr_offset != 0 &&
 668              head.fmh_keys[1].fmr_offset != -1ULL))
 669                 return -EINVAL;
 670
 671         xhead.fmh_iflags = head.fmh_iflags;
 672         xhead.fmh_count = head.fmh_count;
 673         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 674         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 675
 676         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 677         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 678
 679         info.gi_sb = sb;
 680         info.gi_data = arg;
 681         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 682         if (error == EXT4_QUERY_RANGE_ABORT) {
 683                 error = 0;
 684                 aborted = true;
 685         } else if (error)
 686                 return error;
 687
 688         /* If we didn't abort, set the "last" flag in the last fmx */
 689         if (!aborted && info.gi_idx) {
 690                 info.gi_last_flags |= FMR_OF_LAST;
 691                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 692                                  &info.gi_last_flags,
 693                                  sizeof(info.gi_last_flags)))
 694                         return -EFAULT;
 695         }
 696
 697         /* copy back header */
 698         head.fmh_entries = xhead.fmh_entries;
 699         head.fmh_oflags = xhead.fmh_oflags;
 700         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 701                 return -EFAULT;
 702
 703         return 0;
 704 }
 705
 706 static long ext4_ioctl_group_add(struct file *file,
 707                                  struct ext4_new_group_data *input)
 708 {
 709         struct super_block *sb = file_inode(file)->i_sb;
 710         int err, err2=0;
 711
 712         err = ext4_resize_begin(sb);
 713         if (err)
 714                 return err;
 715
 716         if (ext4_has_feature_bigalloc(sb)) {
 717                 ext4_msg(sb, KERN_ERR,
 718                          "Online resizing not supported with bigalloc");
 719                 err = -EOPNOTSUPP;
 720                 goto group_add_out;
 721         }
 722
 723         err = mnt_want_write_file(file);
 724         if (err)
 725                 goto group_add_out;
 726
 727         err = ext4_group_add(sb, input);
 728         if (EXT4_SB(sb)->s_journal) {
 729                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 730                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 731                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 732         }
 733         if (err == 0)
 734                 err = err2;
 735         mnt_drop_write_file(file);
 736         if (!err && ext4_has_group_desc_csum(sb) &&
 737             test_opt(sb, INIT_INODE_TABLE))
 738                 err = ext4_register_li_request(sb, input->group);
 739 group_add_out:
 740         ext4_resize_end(sb);
 741         return err;
 742 }
 743
 744 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 745 {
 746         /*
 747          * Project Quota ID state is only allowed to change from within the init
 748          * namespace. Enforce that restriction only if we are trying to change
 749          * the quota ID state. Everything else is allowed in user namespaces.
 750          */
 751         if (current_user_ns() == &init_user_ns)
 752                 return 0;
 753
 754         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 755                 return -EINVAL;
 756
 757         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 758                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 759                         return -EINVAL;
 760         } else {
 761                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 762                         return -EINVAL;
 763         }
 764
 765         return 0;
 766 }
 767
 768 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 769 {
 770         struct inode *inode = file_inode(filp);
 771         struct super_block *sb = inode->i_sb;
 772         struct ext4_inode_info *ei = EXT4_I(inode);
 773         unsigned int flags;
 774
 775         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 776
 777         switch (cmd) {
 778         case FS_IOC_GETFSMAP:
 779                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 780         case EXT4_IOC_GETFLAGS:
 781                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 782                 if (S_ISREG(inode->i_mode))
 783                         flags &= ~EXT4_PROJINHERIT_FL;
 784                 return put_user(flags, (int __user *) arg);
 785         case EXT4_IOC_SETFLAGS: {
 786                 int err;
 787
 788                 if (!inode_owner_or_capable(inode))
 789                         return -EACCES;
 790
 791                 if (get_user(flags, (int __user *) arg))
 792                         return -EFAULT;
 793
 794                 if (flags & ~EXT4_FL_USER_VISIBLE)
 795                         return -EOPNOTSUPP;
 796                 /*
 797                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 798                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 799                  * more restrictive than just silently masking off visible but
 800                  * not settable flags as we always did.
 801                  */
 802                 flags &= EXT4_FL_USER_MODIFIABLE;
 803                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 804                         return -EOPNOTSUPP;
 805
 806                 err = mnt_want_write_file(filp);
 807                 if (err)
 808                         return err;
 809
 810                 inode_lock(inode);
 811                 err = ext4_ioctl_check_immutable(inode,
 812                                 from_kprojid(&init_user_ns, ei->i_projid),
 813                                 flags);
 814                 if (!err)
 815                         err = ext4_ioctl_setflags(inode, flags);
 816                 inode_unlock(inode);
 817                 mnt_drop_write_file(filp);
 818                 return err;
 819         }
 820         case EXT4_IOC_GETVERSION:
 821         case EXT4_IOC_GETVERSION_OLD:
 822                 return put_user(inode->i_generation, (int __user *) arg);
 823         case EXT4_IOC_SETVERSION:
 824         case EXT4_IOC_SETVERSION_OLD: {
 825                 handle_t *handle;
 826                 struct ext4_iloc iloc;
 827                 __u32 generation;
 828                 int err;
 829
 830                 if (!inode_owner_or_capable(inode))
 831                         return -EPERM;
 832
 833                 if (ext4_has_metadata_csum(inode->i_sb)) {
 834                         ext4_warning(sb, "Setting inode version is not "
 835                                      "supported with metadata_csum enabled.");
 836                         return -ENOTTY;
 837                 }
 838
 839                 err = mnt_want_write_file(filp);
 840                 if (err)
 841                         return err;
 842                 if (get_user(generation, (int __user *) arg)) {
 843                         err = -EFAULT;
 844                         goto setversion_out;
 845                 }
 846
 847                 inode_lock(inode);
 848                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 849                 if (IS_ERR(handle)) {
 850                         err = PTR_ERR(handle);
 851                         goto unlock_out;
 852                 }
 853                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 854                 if (err == 0) {
 855                         inode->i_ctime = current_time(inode);
 856                         inode->i_generation = generation;
 857                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 858                 }
 859                 ext4_journal_stop(handle);
 860
 861 unlock_out:
 862                 inode_unlock(inode);
 863 setversion_out:
 864                 mnt_drop_write_file(filp);
 865                 return err;
 866         }
 867         case EXT4_IOC_GROUP_EXTEND: {
 868                 ext4_fsblk_t n_blocks_count;
 869                 int err, err2=0;
 870
 871                 err = ext4_resize_begin(sb);
 872                 if (err)
 873                         return err;
 874
 875                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 876                         err = -EFAULT;
 877                         goto group_extend_out;
 878                 }
 879
 880                 if (ext4_has_feature_bigalloc(sb)) {
 881                         ext4_msg(sb, KERN_ERR,
 882                                  "Online resizing not supported with bigalloc");
 883                         err = -EOPNOTSUPP;
 884                         goto group_extend_out;
 885                 }
 886
 887                 err = mnt_want_write_file(filp);
 888                 if (err)
 889                         goto group_extend_out;
 890
 891                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 892                 if (EXT4_SB(sb)->s_journal) {
 893                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 894                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 895                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 896                 }
 897                 if (err == 0)
 898                         err = err2;
 899                 mnt_drop_write_file(filp);
 900 group_extend_out:
 901                 ext4_resize_end(sb);
 902                 return err;
 903         }
 904
 905         case EXT4_IOC_MOVE_EXT: {
 906                 struct move_extent me;
 907                 struct fd donor;
 908                 int err;
 909
 910                 if (!(filp->f_mode & FMODE_READ) ||
 911                     !(filp->f_mode & FMODE_WRITE))
 912                         return -EBADF;
 913
 914                 if (copy_from_user(&me,
 915                         (struct move_extent __user *)arg, sizeof(me)))
 916                         return -EFAULT;
 917                 me.moved_len = 0;
 918
 919                 donor = fdget(me.donor_fd);
 920                 if (!donor.file)
 921                         return -EBADF;
 922
 923                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 924                         err = -EBADF;
 925                         goto mext_out;
 926                 }
 927
 928                 if (ext4_has_feature_bigalloc(sb)) {
 929                         ext4_msg(sb, KERN_ERR,
 930                                  "Online defrag not supported with bigalloc");
 931                         err = -EOPNOTSUPP;
 932                         goto mext_out;
 933                 } else if (IS_DAX(inode)) {
 934                         ext4_msg(sb, KERN_ERR,
 935                                  "Online defrag not supported with DAX");
 936                         err = -EOPNOTSUPP;
 937                         goto mext_out;
 938                 }
 939
 940                 err = mnt_want_write_file(filp);
 941                 if (err)
 942                         goto mext_out;
 943
 944                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 945                                         me.donor_start, me.len, &me.moved_len);
 946                 mnt_drop_write_file(filp);
 947
 948                 if (copy_to_user((struct move_extent __user *)arg,
 949                                  &me, sizeof(me)))
 950                         err = -EFAULT;
 951 mext_out:
 952                 fdput(donor);
 953                 return err;
 954         }
 955
 956         case EXT4_IOC_GROUP_ADD: {
 957                 struct ext4_new_group_data input;
 958
 959                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 960                                 sizeof(input)))
 961                         return -EFAULT;
 962
 963                 return ext4_ioctl_group_add(filp, &input);
 964         }
 965
 966         case EXT4_IOC_MIGRATE:
 967         {
 968                 int err;
 969                 if (!inode_owner_or_capable(inode))
 970                         return -EACCES;
 971
 972                 err = mnt_want_write_file(filp);
 973                 if (err)
 974                         return err;
 975                 /*
 976                  * inode_mutex prevent write and truncate on the file.
 977                  * Read still goes through. We take i_data_sem in
 978                  * ext4_ext_swap_inode_data before we switch the
 979                  * inode format to prevent read.
 980                  */
 981                 inode_lock((inode));
 982                 err = ext4_ext_migrate(inode);
 983                 inode_unlock((inode));
 984                 mnt_drop_write_file(filp);
 985                 return err;
 986         }
 987
 988         case EXT4_IOC_ALLOC_DA_BLKS:
 989         {
 990                 int err;
 991                 if (!inode_owner_or_capable(inode))
 992                         return -EACCES;
 993
 994                 err = mnt_want_write_file(filp);
 995                 if (err)
 996                         return err;
 997                 err = ext4_alloc_da_blocks(inode);
 998                 mnt_drop_write_file(filp);
 999                 return err;
1000         }
1001
1002         case EXT4_IOC_SWAP_BOOT:
1003         {
1004                 int err;
1005                 if (!(filp->f_mode & FMODE_WRITE))
1006                         return -EBADF;
1007                 err = mnt_want_write_file(filp);
1008                 if (err)
1009                         return err;
1010                 err = swap_inode_boot_loader(sb, inode);
1011                 mnt_drop_write_file(filp);
1012                 return err;
1013         }
1014
1015         case EXT4_IOC_RESIZE_FS: {
1016                 ext4_fsblk_t n_blocks_count;
1017                 int err = 0, err2 = 0;
1018                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1019
1020                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1021                                    sizeof(__u64))) {
1022                         return -EFAULT;
1023                 }
1024
1025                 err = ext4_resize_begin(sb);
1026                 if (err)
1027                         return err;
1028
1029                 err = mnt_want_write_file(filp);
1030                 if (err)
1031                         goto resizefs_out;
1032
1033                 err = ext4_resize_fs(sb, n_blocks_count);
1034                 if (EXT4_SB(sb)->s_journal) {
1035                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1036                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1037                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1038                 }
1039                 if (err == 0)
1040                         err = err2;
1041                 mnt_drop_write_file(filp);
1042                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1043                     ext4_has_group_desc_csum(sb) &&
1044                     test_opt(sb, INIT_INODE_TABLE))
1045                         err = ext4_register_li_request(sb, o_group);
1046
1047 resizefs_out:
1048                 ext4_resize_end(sb);
1049                 return err;
1050         }
1051
1052         case FITRIM:
1053         {
1054                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1055                 struct fstrim_range range;
1056                 int ret = 0;
1057
1058                 if (!capable(CAP_SYS_ADMIN))
1059                         return -EPERM;
1060
1061                 if (!blk_queue_discard(q))
1062                         return -EOPNOTSUPP;
1063
1064                 /*
1065                  * We haven't replayed the journal, so we cannot use our
1066                  * block-bitmap-guided storage zapping commands.
1067                  */
1068                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1069                         return -EROFS;
1070
1071                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1072                     sizeof(range)))
1073                         return -EFAULT;
1074
1075                 range.minlen = max((unsigned int)range.minlen,
1076                                    q->limits.discard_granularity);
1077                 ret = ext4_trim_fs(sb, &range);
1078                 if (ret < 0)
1079                         return ret;
1080
1081                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1082                     sizeof(range)))
1083                         return -EFAULT;
1084
1085                 return 0;
1086         }
1087         case EXT4_IOC_PRECACHE_EXTENTS:
1088                 return ext4_ext_precache(inode);
1089
1090         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1091                 if (!ext4_has_feature_encrypt(sb))
1092                         return -EOPNOTSUPP;
1093                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1094
1095         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1096 #ifdef CONFIG_FS_ENCRYPTION
1097                 int err, err2;
1098                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1099                 handle_t *handle;
1100
1101                 if (!ext4_has_feature_encrypt(sb))
1102                         return -EOPNOTSUPP;
1103                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1104                         err = mnt_want_write_file(filp);
1105                         if (err)
1106                                 return err;
1107                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1108                         if (IS_ERR(handle)) {
1109                                 err = PTR_ERR(handle);
1110                                 goto pwsalt_err_exit;
1111                         }
1112                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1113                         if (err)
1114                                 goto pwsalt_err_journal;
1115                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1116                         err = ext4_handle_dirty_metadata(handle, NULL,
1117                                                          sbi->s_sbh);
1118                 pwsalt_err_journal:
1119                         err2 = ext4_journal_stop(handle);
1120                         if (err2 && !err)
1121                                 err = err2;
1122                 pwsalt_err_exit:
1123                         mnt_drop_write_file(filp);
1124                         if (err)
1125                                 return err;
1126                 }
1127                 if (copy_to_user((void __user *) arg,
1128                                  sbi->s_es->s_encrypt_pw_salt, 16))
1129                         return -EFAULT;
1130                 return 0;
1131 #else
1132                 return -EOPNOTSUPP;
1133 #endif
1134         }
1135         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1136                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1137
1138         case EXT4_IOC_FSGETXATTR:
1139         {
1140                 struct fsxattr fa;
1141
1142                 memset(&fa, 0, sizeof(struct fsxattr));
1143                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1144
1145                 if (ext4_has_feature_project(inode->i_sb)) {
1146                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1147                                 EXT4_I(inode)->i_projid);
1148                 }
1149
1150                 if (copy_to_user((struct fsxattr __user *)arg,
1151                                  &fa, sizeof(fa)))
1152                         return -EFAULT;
1153                 return 0;
1154         }
1155         case EXT4_IOC_FSSETXATTR:
1156         {
1157                 struct fsxattr fa;
1158                 int err;
1159
1160                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1161                                    sizeof(fa)))
1162                         return -EFAULT;
1163
1164                 /* Make sure caller has proper permission */
1165                 if (!inode_owner_or_capable(inode))
1166                         return -EACCES;
1167
1168                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1169                         return -EOPNOTSUPP;
1170
1171                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1172                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1173                         return -EOPNOTSUPP;
1174
1175                 err = mnt_want_write_file(filp);
1176                 if (err)
1177                         return err;
1178
1179                 inode_lock(inode);
1180                 err = ext4_ioctl_check_project(inode, &fa);
1181                 if (err)
1182                         goto out;
1183                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1184                          (flags & EXT4_FL_XFLAG_VISIBLE);
1185                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1186                 if (err)
1187                         goto out;
1188                 err = ext4_ioctl_setflags(inode, flags);
1189                 if (err)
1190                         goto out;
1191                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1192 out:
1193                 inode_unlock(inode);
1194                 mnt_drop_write_file(filp);
1195                 return err;
1196         }
1197         case EXT4_IOC_SHUTDOWN:
1198                 return ext4_shutdown(sb, arg);
1199         default:
1200                 return -ENOTTY;
1201         }
1202 }
1203
1204 #ifdef CONFIG_COMPAT
1205 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1206 {
1207         /* These are just misnamed, they actually get/put from/to user an int */
1208         switch (cmd) {
1209         case EXT4_IOC32_GETFLAGS:
1210                 cmd = EXT4_IOC_GETFLAGS;
1211                 break;
1212         case EXT4_IOC32_SETFLAGS:
1213                 cmd = EXT4_IOC_SETFLAGS;
1214                 break;
1215         case EXT4_IOC32_GETVERSION:
1216                 cmd = EXT4_IOC_GETVERSION;
1217                 break;
1218         case EXT4_IOC32_SETVERSION:
1219                 cmd = EXT4_IOC_SETVERSION;
1220                 break;
1221         case EXT4_IOC32_GROUP_EXTEND:
1222                 cmd = EXT4_IOC_GROUP_EXTEND;
1223                 break;
1224         case EXT4_IOC32_GETVERSION_OLD:
1225                 cmd = EXT4_IOC_GETVERSION_OLD;
1226                 break;
1227         case EXT4_IOC32_SETVERSION_OLD:
1228                 cmd = EXT4_IOC_SETVERSION_OLD;
1229                 break;
1230         case EXT4_IOC32_GETRSVSZ:
1231                 cmd = EXT4_IOC_GETRSVSZ;
1232                 break;
1233         case EXT4_IOC32_SETRSVSZ:
1234                 cmd = EXT4_IOC_SETRSVSZ;
1235                 break;
1236         case EXT4_IOC32_GROUP_ADD: {
1237                 struct compat_ext4_new_group_input __user *uinput;
1238                 struct ext4_new_group_data input;
1239                 int err;
1240
1241                 uinput = compat_ptr(arg);
1242                 err = get_user(input.group, &uinput->group);
1243                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1244                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1245                 err |= get_user(input.inode_table, &uinput->inode_table);
1246                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1247                 err |= get_user(input.reserved_blocks,
1248                                 &uinput->reserved_blocks);
1249                 if (err)
1250                         return -EFAULT;
1251                 return ext4_ioctl_group_add(file, &input);
1252         }
1253         case EXT4_IOC_MOVE_EXT:
1254         case EXT4_IOC_RESIZE_FS:
1255         case EXT4_IOC_PRECACHE_EXTENTS:
1256         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1257         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1258         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1259         case EXT4_IOC_SHUTDOWN:
1260         case FS_IOC_GETFSMAP:
1261                 break;
1262         default:
1263                 return -ENOIOCTLCMD;
1264         }
1265         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1266 }
1267 #endif