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_EXT4_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
 305         /* Is it quota file? Do not allow user to mess with it */
 306         if (ext4_is_quota_file(inode))
 307                 goto flags_out;
 308
 309         oldflags = ei->i_flags;
 310
 311         /* The JOURNAL_DATA flag is modifiable only by root */
 312         jflag = flags & EXT4_JOURNAL_DATA_FL;
 313
 314         /*
 315          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 316          * the relevant capability.
 317          *
 318          * This test looks nicer. Thanks to Pauline Middelink
 319          */
 320         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 321                 if (!capable(CAP_LINUX_IMMUTABLE))
 322                         goto flags_out;
 323         }
 324
 325         /*
 326          * The JOURNAL_DATA flag can only be changed by
 327          * the relevant capability.
 328          */
 329         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 330                 if (!capable(CAP_SYS_RESOURCE))
 331                         goto flags_out;
 332         }
 333         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 334                 migrate = 1;
 335
 336         if (flags & EXT4_EOFBLOCKS_FL) {
 337                 /* we don't support adding EOFBLOCKS flag */
 338                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 339                         err = -EOPNOTSUPP;
 340                         goto flags_out;
 341                 }
 342         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 343                 err = ext4_truncate(inode);
 344                 if (err)
 345                         goto flags_out;
 346         }
 347
 348         /*
 349          * Wait for all pending directio and then flush all the dirty pages
 350          * for this file.  The flush marks all the pages readonly, so any
 351          * subsequent attempt to write to the file (particularly mmap pages)
 352          * will come through the filesystem and fail.
 353          */
 354         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 355             (flags & EXT4_IMMUTABLE_FL)) {
 356                 inode_dio_wait(inode);
 357                 err = filemap_write_and_wait(inode->i_mapping);
 358                 if (err)
 359                         goto flags_out;
 360         }
 361
 362         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 363         if (IS_ERR(handle)) {
 364                 err = PTR_ERR(handle);
 365                 goto flags_out;
 366         }
 367         if (IS_SYNC(inode))
 368                 ext4_handle_sync(handle);
 369         err = ext4_reserve_inode_write(handle, inode, &iloc);
 370         if (err)
 371                 goto flags_err;
 372
 373         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 374                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 375                         continue;
 376                 /* These flags get special treatment later */
 377                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 378                         continue;
 379                 if (mask & flags)
 380                         ext4_set_inode_flag(inode, i);
 381                 else
 382                         ext4_clear_inode_flag(inode, i);
 383         }
 384
 385         ext4_set_inode_flags(inode);
 386         inode->i_ctime = current_time(inode);
 387
 388         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 389 flags_err:
 390         ext4_journal_stop(handle);
 391         if (err)
 392                 goto flags_out;
 393
 394         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 395                 /*
 396                  * Changes to the journaling mode can cause unsafe changes to
 397                  * S_DAX if we are using the DAX mount option.
 398                  */
 399                 if (test_opt(inode->i_sb, DAX)) {
 400                         err = -EBUSY;
 401                         goto flags_out;
 402                 }
 403
 404                 err = ext4_change_inode_journal_flag(inode, jflag);
 405                 if (err)
 406                         goto flags_out;
 407         }
 408         if (migrate) {
 409                 if (flags & EXT4_EXTENTS_FL)
 410                         err = ext4_ext_migrate(inode);
 411                 else
 412                         err = ext4_ind_migrate(inode);
 413         }
 414
 415 flags_out:
 416         return err;
 417 }
 418
 419 #ifdef CONFIG_QUOTA
 420 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 421 {
 422         struct inode *inode = file_inode(filp);
 423         struct super_block *sb = inode->i_sb;
 424         struct ext4_inode_info *ei = EXT4_I(inode);
 425         int err, rc;
 426         handle_t *handle;
 427         kprojid_t kprojid;
 428         struct ext4_iloc iloc;
 429         struct ext4_inode *raw_inode;
 430         struct dquot *transfer_to[MAXQUOTAS] = { };
 431
 432         if (!ext4_has_feature_project(sb)) {
 433                 if (projid != EXT4_DEF_PROJID)
 434                         return -EOPNOTSUPP;
 435                 else
 436                         return 0;
 437         }
 438
 439         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 440                 return -EOPNOTSUPP;
 441
 442         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 443
 444         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 445                 return 0;
 446
 447         err = -EPERM;
 448         /* Is it quota file? Do not allow user to mess with it */
 449         if (ext4_is_quota_file(inode))
 450                 return err;
 451
 452         err = ext4_get_inode_loc(inode, &iloc);
 453         if (err)
 454                 return err;
 455
 456         raw_inode = ext4_raw_inode(&iloc);
 457         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 458                 err = ext4_expand_extra_isize(inode,
 459                                               EXT4_SB(sb)->s_want_extra_isize,
 460                                               &iloc);
 461                 if (err)
 462                         return err;
 463         } else {
 464                 brelse(iloc.bh);
 465         }
 466
 467         err = dquot_initialize(inode);
 468         if (err)
 469                 return err;
 470
 471         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 472                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 473                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 474         if (IS_ERR(handle))
 475                 return PTR_ERR(handle);
 476
 477         err = ext4_reserve_inode_write(handle, inode, &iloc);
 478         if (err)
 479                 goto out_stop;
 480
 481         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 482         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 483
 484                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 485                  * counts xattr inode references.
 486                  */
 487                 down_read(&EXT4_I(inode)->xattr_sem);
 488                 err = __dquot_transfer(inode, transfer_to);
 489                 up_read(&EXT4_I(inode)->xattr_sem);
 490                 dqput(transfer_to[PRJQUOTA]);
 491                 if (err)
 492                         goto out_dirty;
 493         }
 494
 495         EXT4_I(inode)->i_projid = kprojid;
 496         inode->i_ctime = current_time(inode);
 497 out_dirty:
 498         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 499         if (!err)
 500                 err = rc;
 501 out_stop:
 502         ext4_journal_stop(handle);
 503         return err;
 504 }
 505 #else
 506 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 507 {
 508         if (projid != EXT4_DEF_PROJID)
 509                 return -EOPNOTSUPP;
 510         return 0;
 511 }
 512 #endif
 513
 514 /* Transfer internal flags to xflags */
 515 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 516 {
 517         __u32 xflags = 0;
 518
 519         if (iflags & EXT4_SYNC_FL)
 520                 xflags |= FS_XFLAG_SYNC;
 521         if (iflags & EXT4_IMMUTABLE_FL)
 522                 xflags |= FS_XFLAG_IMMUTABLE;
 523         if (iflags & EXT4_APPEND_FL)
 524                 xflags |= FS_XFLAG_APPEND;
 525         if (iflags & EXT4_NODUMP_FL)
 526                 xflags |= FS_XFLAG_NODUMP;
 527         if (iflags & EXT4_NOATIME_FL)
 528                 xflags |= FS_XFLAG_NOATIME;
 529         if (iflags & EXT4_PROJINHERIT_FL)
 530                 xflags |= FS_XFLAG_PROJINHERIT;
 531         return xflags;
 532 }
 533
 534 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 535                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 536                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 537
 538 /* Transfer xflags flags to internal */
 539 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 540 {
 541         unsigned long iflags = 0;
 542
 543         if (xflags & FS_XFLAG_SYNC)
 544                 iflags |= EXT4_SYNC_FL;
 545         if (xflags & FS_XFLAG_IMMUTABLE)
 546                 iflags |= EXT4_IMMUTABLE_FL;
 547         if (xflags & FS_XFLAG_APPEND)
 548                 iflags |= EXT4_APPEND_FL;
 549         if (xflags & FS_XFLAG_NODUMP)
 550                 iflags |= EXT4_NODUMP_FL;
 551         if (xflags & FS_XFLAG_NOATIME)
 552                 iflags |= EXT4_NOATIME_FL;
 553         if (xflags & FS_XFLAG_PROJINHERIT)
 554                 iflags |= EXT4_PROJINHERIT_FL;
 555
 556         return iflags;
 557 }
 558
 559 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 560 {
 561         struct ext4_sb_info *sbi = EXT4_SB(sb);
 562         __u32 flags;
 563
 564         if (!capable(CAP_SYS_ADMIN))
 565                 return -EPERM;
 566
 567         if (get_user(flags, (__u32 __user *)arg))
 568                 return -EFAULT;
 569
 570         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 571                 return -EINVAL;
 572
 573         if (ext4_forced_shutdown(sbi))
 574                 return 0;
 575
 576         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 577         trace_ext4_shutdown(sb, flags);
 578
 579         switch (flags) {
 580         case EXT4_GOING_FLAGS_DEFAULT:
 581                 freeze_bdev(sb->s_bdev);
 582                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 583                 thaw_bdev(sb->s_bdev, sb);
 584                 break;
 585         case EXT4_GOING_FLAGS_LOGFLUSH:
 586                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 587                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 588                         (void) ext4_force_commit(sb);
 589                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 590                 }
 591                 break;
 592         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 593                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 594                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 595                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 596                 break;
 597         default:
 598                 return -EINVAL;
 599         }
 600         clear_opt(sb, DISCARD);
 601         return 0;
 602 }
 603
 604 struct getfsmap_info {
 605         struct super_block      *gi_sb;
 606         struct fsmap_head __user *gi_data;
 607         unsigned int            gi_idx;
 608         __u32                   gi_last_flags;
 609 };
 610
 611 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 612 {
 613         struct getfsmap_info *info = priv;
 614         struct fsmap fm;
 615
 616         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 617
 618         info->gi_last_flags = xfm->fmr_flags;
 619         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 620         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 621                         sizeof(struct fsmap)))
 622                 return -EFAULT;
 623
 624         return 0;
 625 }
 626
 627 static int ext4_ioc_getfsmap(struct super_block *sb,
 628                              struct fsmap_head __user *arg)
 629 {
 630         struct getfsmap_info info = {0};
 631         struct ext4_fsmap_head xhead = {0};
 632         struct fsmap_head head;
 633         bool aborted = false;
 634         int error;
 635
 636         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 637                 return -EFAULT;
 638         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 639             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 640                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 641             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 642                        sizeof(head.fmh_keys[1].fmr_reserved)))
 643                 return -EINVAL;
 644         /*
 645          * ext4 doesn't report file extents at all, so the only valid
 646          * file offsets are the magic ones (all zeroes or all ones).
 647          */
 648         if (head.fmh_keys[0].fmr_offset ||
 649             (head.fmh_keys[1].fmr_offset != 0 &&
 650              head.fmh_keys[1].fmr_offset != -1ULL))
 651                 return -EINVAL;
 652
 653         xhead.fmh_iflags = head.fmh_iflags;
 654         xhead.fmh_count = head.fmh_count;
 655         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 656         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 657
 658         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 659         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 660
 661         info.gi_sb = sb;
 662         info.gi_data = arg;
 663         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 664         if (error == EXT4_QUERY_RANGE_ABORT) {
 665                 error = 0;
 666                 aborted = true;
 667         } else if (error)
 668                 return error;
 669
 670         /* If we didn't abort, set the "last" flag in the last fmx */
 671         if (!aborted && info.gi_idx) {
 672                 info.gi_last_flags |= FMR_OF_LAST;
 673                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 674                                  &info.gi_last_flags,
 675                                  sizeof(info.gi_last_flags)))
 676                         return -EFAULT;
 677         }
 678
 679         /* copy back header */
 680         head.fmh_entries = xhead.fmh_entries;
 681         head.fmh_oflags = xhead.fmh_oflags;
 682         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 683                 return -EFAULT;
 684
 685         return 0;
 686 }
 687
 688 static long ext4_ioctl_group_add(struct file *file,
 689                                  struct ext4_new_group_data *input)
 690 {
 691         struct super_block *sb = file_inode(file)->i_sb;
 692         int err, err2=0;
 693
 694         err = ext4_resize_begin(sb);
 695         if (err)
 696                 return err;
 697
 698         if (ext4_has_feature_bigalloc(sb)) {
 699                 ext4_msg(sb, KERN_ERR,
 700                          "Online resizing not supported with bigalloc");
 701                 err = -EOPNOTSUPP;
 702                 goto group_add_out;
 703         }
 704
 705         err = mnt_want_write_file(file);
 706         if (err)
 707                 goto group_add_out;
 708
 709         err = ext4_group_add(sb, input);
 710         if (EXT4_SB(sb)->s_journal) {
 711                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 712                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 713                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 714         }
 715         if (err == 0)
 716                 err = err2;
 717         mnt_drop_write_file(file);
 718         if (!err && ext4_has_group_desc_csum(sb) &&
 719             test_opt(sb, INIT_INODE_TABLE))
 720                 err = ext4_register_li_request(sb, input->group);
 721 group_add_out:
 722         ext4_resize_end(sb);
 723         return err;
 724 }
 725
 726 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 727 {
 728         /*
 729          * Project Quota ID state is only allowed to change from within the init
 730          * namespace. Enforce that restriction only if we are trying to change
 731          * the quota ID state. Everything else is allowed in user namespaces.
 732          */
 733         if (current_user_ns() == &init_user_ns)
 734                 return 0;
 735
 736         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 737                 return -EINVAL;
 738
 739         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 740                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 741                         return -EINVAL;
 742         } else {
 743                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 744                         return -EINVAL;
 745         }
 746
 747         return 0;
 748 }
 749
 750 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 751 {
 752         struct inode *inode = file_inode(filp);
 753         struct super_block *sb = inode->i_sb;
 754         struct ext4_inode_info *ei = EXT4_I(inode);
 755         unsigned int flags;
 756
 757         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 758
 759         switch (cmd) {
 760         case FS_IOC_GETFSMAP:
 761                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 762         case EXT4_IOC_GETFLAGS:
 763                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 764                 return put_user(flags, (int __user *) arg);
 765         case EXT4_IOC_SETFLAGS: {
 766                 int err;
 767
 768                 if (!inode_owner_or_capable(inode))
 769                         return -EACCES;
 770
 771                 if (get_user(flags, (int __user *) arg))
 772                         return -EFAULT;
 773
 774                 if (flags & ~EXT4_FL_USER_VISIBLE)
 775                         return -EOPNOTSUPP;
 776                 /*
 777                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 778                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 779                  * more restrictive than just silently masking off visible but
 780                  * not settable flags as we always did.
 781                  */
 782                 flags &= EXT4_FL_USER_MODIFIABLE;
 783                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 784                         return -EOPNOTSUPP;
 785
 786                 err = mnt_want_write_file(filp);
 787                 if (err)
 788                         return err;
 789
 790                 inode_lock(inode);
 791                 err = ext4_ioctl_check_immutable(inode,
 792                                 from_kprojid(&init_user_ns, ei->i_projid),
 793                                 flags);
 794                 if (!err)
 795                         err = ext4_ioctl_setflags(inode, flags);
 796                 inode_unlock(inode);
 797                 mnt_drop_write_file(filp);
 798                 return err;
 799         }
 800         case EXT4_IOC_GETVERSION:
 801         case EXT4_IOC_GETVERSION_OLD:
 802                 return put_user(inode->i_generation, (int __user *) arg);
 803         case EXT4_IOC_SETVERSION:
 804         case EXT4_IOC_SETVERSION_OLD: {
 805                 handle_t *handle;
 806                 struct ext4_iloc iloc;
 807                 __u32 generation;
 808                 int err;
 809
 810                 if (!inode_owner_or_capable(inode))
 811                         return -EPERM;
 812
 813                 if (ext4_has_metadata_csum(inode->i_sb)) {
 814                         ext4_warning(sb, "Setting inode version is not "
 815                                      "supported with metadata_csum enabled.");
 816                         return -ENOTTY;
 817                 }
 818
 819                 err = mnt_want_write_file(filp);
 820                 if (err)
 821                         return err;
 822                 if (get_user(generation, (int __user *) arg)) {
 823                         err = -EFAULT;
 824                         goto setversion_out;
 825                 }
 826
 827                 inode_lock(inode);
 828                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 829                 if (IS_ERR(handle)) {
 830                         err = PTR_ERR(handle);
 831                         goto unlock_out;
 832                 }
 833                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 834                 if (err == 0) {
 835                         inode->i_ctime = current_time(inode);
 836                         inode->i_generation = generation;
 837                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 838                 }
 839                 ext4_journal_stop(handle);
 840
 841 unlock_out:
 842                 inode_unlock(inode);
 843 setversion_out:
 844                 mnt_drop_write_file(filp);
 845                 return err;
 846         }
 847         case EXT4_IOC_GROUP_EXTEND: {
 848                 ext4_fsblk_t n_blocks_count;
 849                 int err, err2=0;
 850
 851                 err = ext4_resize_begin(sb);
 852                 if (err)
 853                         return err;
 854
 855                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 856                         err = -EFAULT;
 857                         goto group_extend_out;
 858                 }
 859
 860                 if (ext4_has_feature_bigalloc(sb)) {
 861                         ext4_msg(sb, KERN_ERR,
 862                                  "Online resizing not supported with bigalloc");
 863                         err = -EOPNOTSUPP;
 864                         goto group_extend_out;
 865                 }
 866
 867                 err = mnt_want_write_file(filp);
 868                 if (err)
 869                         goto group_extend_out;
 870
 871                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 872                 if (EXT4_SB(sb)->s_journal) {
 873                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 874                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 875                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 876                 }
 877                 if (err == 0)
 878                         err = err2;
 879                 mnt_drop_write_file(filp);
 880 group_extend_out:
 881                 ext4_resize_end(sb);
 882                 return err;
 883         }
 884
 885         case EXT4_IOC_MOVE_EXT: {
 886                 struct move_extent me;
 887                 struct fd donor;
 888                 int err;
 889
 890                 if (!(filp->f_mode & FMODE_READ) ||
 891                     !(filp->f_mode & FMODE_WRITE))
 892                         return -EBADF;
 893
 894                 if (copy_from_user(&me,
 895                         (struct move_extent __user *)arg, sizeof(me)))
 896                         return -EFAULT;
 897                 me.moved_len = 0;
 898
 899                 donor = fdget(me.donor_fd);
 900                 if (!donor.file)
 901                         return -EBADF;
 902
 903                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 904                         err = -EBADF;
 905                         goto mext_out;
 906                 }
 907
 908                 if (ext4_has_feature_bigalloc(sb)) {
 909                         ext4_msg(sb, KERN_ERR,
 910                                  "Online defrag not supported with bigalloc");
 911                         err = -EOPNOTSUPP;
 912                         goto mext_out;
 913                 } else if (IS_DAX(inode)) {
 914                         ext4_msg(sb, KERN_ERR,
 915                                  "Online defrag not supported with DAX");
 916                         err = -EOPNOTSUPP;
 917                         goto mext_out;
 918                 }
 919
 920                 err = mnt_want_write_file(filp);
 921                 if (err)
 922                         goto mext_out;
 923
 924                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 925                                         me.donor_start, me.len, &me.moved_len);
 926                 mnt_drop_write_file(filp);
 927
 928                 if (copy_to_user((struct move_extent __user *)arg,
 929                                  &me, sizeof(me)))
 930                         err = -EFAULT;
 931 mext_out:
 932                 fdput(donor);
 933                 return err;
 934         }
 935
 936         case EXT4_IOC_GROUP_ADD: {
 937                 struct ext4_new_group_data input;
 938
 939                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 940                                 sizeof(input)))
 941                         return -EFAULT;
 942
 943                 return ext4_ioctl_group_add(filp, &input);
 944         }
 945
 946         case EXT4_IOC_MIGRATE:
 947         {
 948                 int err;
 949                 if (!inode_owner_or_capable(inode))
 950                         return -EACCES;
 951
 952                 err = mnt_want_write_file(filp);
 953                 if (err)
 954                         return err;
 955                 /*
 956                  * inode_mutex prevent write and truncate on the file.
 957                  * Read still goes through. We take i_data_sem in
 958                  * ext4_ext_swap_inode_data before we switch the
 959                  * inode format to prevent read.
 960                  */
 961                 inode_lock((inode));
 962                 err = ext4_ext_migrate(inode);
 963                 inode_unlock((inode));
 964                 mnt_drop_write_file(filp);
 965                 return err;
 966         }
 967
 968         case EXT4_IOC_ALLOC_DA_BLKS:
 969         {
 970                 int err;
 971                 if (!inode_owner_or_capable(inode))
 972                         return -EACCES;
 973
 974                 err = mnt_want_write_file(filp);
 975                 if (err)
 976                         return err;
 977                 err = ext4_alloc_da_blocks(inode);
 978                 mnt_drop_write_file(filp);
 979                 return err;
 980         }
 981
 982         case EXT4_IOC_SWAP_BOOT:
 983         {
 984                 int err;
 985                 if (!(filp->f_mode & FMODE_WRITE))
 986                         return -EBADF;
 987                 err = mnt_want_write_file(filp);
 988                 if (err)
 989                         return err;
 990                 err = swap_inode_boot_loader(sb, inode);
 991                 mnt_drop_write_file(filp);
 992                 return err;
 993         }
 994
 995         case EXT4_IOC_RESIZE_FS: {
 996                 ext4_fsblk_t n_blocks_count;
 997                 int err = 0, err2 = 0;
 998                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 999
1000                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1001                                    sizeof(__u64))) {
1002                         return -EFAULT;
1003                 }
1004
1005                 err = ext4_resize_begin(sb);
1006                 if (err)
1007                         return err;
1008
1009                 err = mnt_want_write_file(filp);
1010                 if (err)
1011                         goto resizefs_out;
1012
1013                 err = ext4_resize_fs(sb, n_blocks_count);
1014                 if (EXT4_SB(sb)->s_journal) {
1015                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1016                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1017                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1018                 }
1019                 if (err == 0)
1020                         err = err2;
1021                 mnt_drop_write_file(filp);
1022                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1023                     ext4_has_group_desc_csum(sb) &&
1024                     test_opt(sb, INIT_INODE_TABLE))
1025                         err = ext4_register_li_request(sb, o_group);
1026
1027 resizefs_out:
1028                 ext4_resize_end(sb);
1029                 return err;
1030         }
1031
1032         case FITRIM:
1033         {
1034                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1035                 struct fstrim_range range;
1036                 int ret = 0;
1037
1038                 if (!capable(CAP_SYS_ADMIN))
1039                         return -EPERM;
1040
1041                 if (!blk_queue_discard(q))
1042                         return -EOPNOTSUPP;
1043
1044                 /*
1045                  * We haven't replayed the journal, so we cannot use our
1046                  * block-bitmap-guided storage zapping commands.
1047                  */
1048                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1049                         return -EROFS;
1050
1051                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1052                     sizeof(range)))
1053                         return -EFAULT;
1054
1055                 range.minlen = max((unsigned int)range.minlen,
1056                                    q->limits.discard_granularity);
1057                 ret = ext4_trim_fs(sb, &range);
1058                 if (ret < 0)
1059                         return ret;
1060
1061                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1062                     sizeof(range)))
1063                         return -EFAULT;
1064
1065                 return 0;
1066         }
1067         case EXT4_IOC_PRECACHE_EXTENTS:
1068                 return ext4_ext_precache(inode);
1069
1070         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1071                 if (!ext4_has_feature_encrypt(sb))
1072                         return -EOPNOTSUPP;
1073                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1074
1075         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1076 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1077                 int err, err2;
1078                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1079                 handle_t *handle;
1080
1081                 if (!ext4_has_feature_encrypt(sb))
1082                         return -EOPNOTSUPP;
1083                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1084                         err = mnt_want_write_file(filp);
1085                         if (err)
1086                                 return err;
1087                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1088                         if (IS_ERR(handle)) {
1089                                 err = PTR_ERR(handle);
1090                                 goto pwsalt_err_exit;
1091                         }
1092                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1093                         if (err)
1094                                 goto pwsalt_err_journal;
1095                         lock_buffer(sbi->s_sbh);
1096                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1097                         ext4_superblock_csum_set(sb);
1098                         unlock_buffer(sbi->s_sbh);
1099                         err = ext4_handle_dirty_metadata(handle, NULL,
1100                                                          sbi->s_sbh);
1101                 pwsalt_err_journal:
1102                         err2 = ext4_journal_stop(handle);
1103                         if (err2 && !err)
1104                                 err = err2;
1105                 pwsalt_err_exit:
1106                         mnt_drop_write_file(filp);
1107                         if (err)
1108                                 return err;
1109                 }
1110                 if (copy_to_user((void __user *) arg,
1111                                  sbi->s_es->s_encrypt_pw_salt, 16))
1112                         return -EFAULT;
1113                 return 0;
1114 #else
1115                 return -EOPNOTSUPP;
1116 #endif
1117         }
1118         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1119                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1120
1121         case EXT4_IOC_FSGETXATTR:
1122         {
1123                 struct fsxattr fa;
1124
1125                 memset(&fa, 0, sizeof(struct fsxattr));
1126                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1127
1128                 if (ext4_has_feature_project(inode->i_sb)) {
1129                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1130                                 EXT4_I(inode)->i_projid);
1131                 }
1132
1133                 if (copy_to_user((struct fsxattr __user *)arg,
1134                                  &fa, sizeof(fa)))
1135                         return -EFAULT;
1136                 return 0;
1137         }
1138         case EXT4_IOC_FSSETXATTR:
1139         {
1140                 struct fsxattr fa;
1141                 int err;
1142
1143                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1144                                    sizeof(fa)))
1145                         return -EFAULT;
1146
1147                 /* Make sure caller has proper permission */
1148                 if (!inode_owner_or_capable(inode))
1149                         return -EACCES;
1150
1151                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1152                         return -EOPNOTSUPP;
1153
1154                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1155                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1156                         return -EOPNOTSUPP;
1157
1158                 err = mnt_want_write_file(filp);
1159                 if (err)
1160                         return err;
1161
1162                 inode_lock(inode);
1163                 err = ext4_ioctl_check_project(inode, &fa);
1164                 if (err)
1165                         goto out;
1166                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1167                          (flags & EXT4_FL_XFLAG_VISIBLE);
1168                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1169                 if (err)
1170                         goto out;
1171                 err = ext4_ioctl_setflags(inode, flags);
1172                 if (err)
1173                         goto out;
1174                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1175 out:
1176                 inode_unlock(inode);
1177                 mnt_drop_write_file(filp);
1178                 return err;
1179         }
1180         case EXT4_IOC_SHUTDOWN:
1181                 return ext4_shutdown(sb, arg);
1182         default:
1183                 return -ENOTTY;
1184         }
1185 }
1186
1187 #ifdef CONFIG_COMPAT
1188 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1189 {
1190         /* These are just misnamed, they actually get/put from/to user an int */
1191         switch (cmd) {
1192         case EXT4_IOC32_GETFLAGS:
1193                 cmd = EXT4_IOC_GETFLAGS;
1194                 break;
1195         case EXT4_IOC32_SETFLAGS:
1196                 cmd = EXT4_IOC_SETFLAGS;
1197                 break;
1198         case EXT4_IOC32_GETVERSION:
1199                 cmd = EXT4_IOC_GETVERSION;
1200                 break;
1201         case EXT4_IOC32_SETVERSION:
1202                 cmd = EXT4_IOC_SETVERSION;
1203                 break;
1204         case EXT4_IOC32_GROUP_EXTEND:
1205                 cmd = EXT4_IOC_GROUP_EXTEND;
1206                 break;
1207         case EXT4_IOC32_GETVERSION_OLD:
1208                 cmd = EXT4_IOC_GETVERSION_OLD;
1209                 break;
1210         case EXT4_IOC32_SETVERSION_OLD:
1211                 cmd = EXT4_IOC_SETVERSION_OLD;
1212                 break;
1213         case EXT4_IOC32_GETRSVSZ:
1214                 cmd = EXT4_IOC_GETRSVSZ;
1215                 break;
1216         case EXT4_IOC32_SETRSVSZ:
1217                 cmd = EXT4_IOC_SETRSVSZ;
1218                 break;
1219         case EXT4_IOC32_GROUP_ADD: {
1220                 struct compat_ext4_new_group_input __user *uinput;
1221                 struct ext4_new_group_data input;
1222                 int err;
1223
1224                 uinput = compat_ptr(arg);
1225                 err = get_user(input.group, &uinput->group);
1226                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1227                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1228                 err |= get_user(input.inode_table, &uinput->inode_table);
1229                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1230                 err |= get_user(input.reserved_blocks,
1231                                 &uinput->reserved_blocks);
1232                 if (err)
1233                         return -EFAULT;
1234                 return ext4_ioctl_group_add(file, &input);
1235         }
1236         case EXT4_IOC_MOVE_EXT:
1237         case EXT4_IOC_RESIZE_FS:
1238         case EXT4_IOC_PRECACHE_EXTENTS:
1239         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1240         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1241         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1242         case EXT4_IOC_SHUTDOWN:
1243         case FS_IOC_GETFSMAP:
1244                 break;
1245         default:
1246                 return -ENOIOCTLCMD;
1247         }
1248         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1249 }
1250 #endif