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 ([email protected])
   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         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 316         if (err)
 317                 goto flags_out;
 318
 319         /*
 320          * The JOURNAL_DATA flag can only be changed by
 321          * the relevant capability.
 322          */
 323         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 324                 if (!capable(CAP_SYS_RESOURCE))
 325                         goto flags_out;
 326         }
 327         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 328                 migrate = 1;
 329
 330         if (flags & EXT4_EOFBLOCKS_FL) {
 331                 /* we don't support adding EOFBLOCKS flag */
 332                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 333                         err = -EOPNOTSUPP;
 334                         goto flags_out;
 335                 }
 336         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 337                 err = ext4_truncate(inode);
 338                 if (err)
 339                         goto flags_out;
 340         }
 341
 342         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 343                 if (!ext4_has_feature_casefold(sb)) {
 344                         err = -EOPNOTSUPP;
 345                         goto flags_out;
 346                 }
 347
 348                 if (!S_ISDIR(inode->i_mode)) {
 349                         err = -ENOTDIR;
 350                         goto flags_out;
 351                 }
 352
 353                 if (!ext4_empty_dir(inode)) {
 354                         err = -ENOTEMPTY;
 355                         goto flags_out;
 356                 }
 357         }
 358
 359         /*
 360          * Wait for all pending directio and then flush all the dirty pages
 361          * for this file.  The flush marks all the pages readonly, so any
 362          * subsequent attempt to write to the file (particularly mmap pages)
 363          * will come through the filesystem and fail.
 364          */
 365         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 366             (flags & EXT4_IMMUTABLE_FL)) {
 367                 inode_dio_wait(inode);
 368                 err = filemap_write_and_wait(inode->i_mapping);
 369                 if (err)
 370                         goto flags_out;
 371         }
 372
 373         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 374         if (IS_ERR(handle)) {
 375                 err = PTR_ERR(handle);
 376                 goto flags_out;
 377         }
 378         if (IS_SYNC(inode))
 379                 ext4_handle_sync(handle);
 380         err = ext4_reserve_inode_write(handle, inode, &iloc);
 381         if (err)
 382                 goto flags_err;
 383
 384         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 385                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 386                         continue;
 387                 /* These flags get special treatment later */
 388                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 389                         continue;
 390                 if (mask & flags)
 391                         ext4_set_inode_flag(inode, i);
 392                 else
 393                         ext4_clear_inode_flag(inode, i);
 394         }
 395
 396         ext4_set_inode_flags(inode);
 397         inode->i_ctime = current_time(inode);
 398
 399         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 400 flags_err:
 401         ext4_journal_stop(handle);
 402         if (err)
 403                 goto flags_out;
 404
 405         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 406                 /*
 407                  * Changes to the journaling mode can cause unsafe changes to
 408                  * S_DAX if we are using the DAX mount option.
 409                  */
 410                 if (test_opt(inode->i_sb, DAX)) {
 411                         err = -EBUSY;
 412                         goto flags_out;
 413                 }
 414
 415                 err = ext4_change_inode_journal_flag(inode, jflag);
 416                 if (err)
 417                         goto flags_out;
 418         }
 419         if (migrate) {
 420                 if (flags & EXT4_EXTENTS_FL)
 421                         err = ext4_ext_migrate(inode);
 422                 else
 423                         err = ext4_ind_migrate(inode);
 424         }
 425
 426 flags_out:
 427         return err;
 428 }
 429
 430 #ifdef CONFIG_QUOTA
 431 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 432 {
 433         struct inode *inode = file_inode(filp);
 434         struct super_block *sb = inode->i_sb;
 435         struct ext4_inode_info *ei = EXT4_I(inode);
 436         int err, rc;
 437         handle_t *handle;
 438         kprojid_t kprojid;
 439         struct ext4_iloc iloc;
 440         struct ext4_inode *raw_inode;
 441         struct dquot *transfer_to[MAXQUOTAS] = { };
 442
 443         if (!ext4_has_feature_project(sb)) {
 444                 if (projid != EXT4_DEF_PROJID)
 445                         return -EOPNOTSUPP;
 446                 else
 447                         return 0;
 448         }
 449
 450         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 451                 return -EOPNOTSUPP;
 452
 453         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 454
 455         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 456                 return 0;
 457
 458         err = -EPERM;
 459         /* Is it quota file? Do not allow user to mess with it */
 460         if (ext4_is_quota_file(inode))
 461                 return err;
 462
 463         err = ext4_get_inode_loc(inode, &iloc);
 464         if (err)
 465                 return err;
 466
 467         raw_inode = ext4_raw_inode(&iloc);
 468         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 469                 err = ext4_expand_extra_isize(inode,
 470                                               EXT4_SB(sb)->s_want_extra_isize,
 471                                               &iloc);
 472                 if (err)
 473                         return err;
 474         } else {
 475                 brelse(iloc.bh);
 476         }
 477
 478         err = dquot_initialize(inode);
 479         if (err)
 480                 return err;
 481
 482         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 483                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 484                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 485         if (IS_ERR(handle))
 486                 return PTR_ERR(handle);
 487
 488         err = ext4_reserve_inode_write(handle, inode, &iloc);
 489         if (err)
 490                 goto out_stop;
 491
 492         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 493         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 494
 495                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 496                  * counts xattr inode references.
 497                  */
 498                 down_read(&EXT4_I(inode)->xattr_sem);
 499                 err = __dquot_transfer(inode, transfer_to);
 500                 up_read(&EXT4_I(inode)->xattr_sem);
 501                 dqput(transfer_to[PRJQUOTA]);
 502                 if (err)
 503                         goto out_dirty;
 504         }
 505
 506         EXT4_I(inode)->i_projid = kprojid;
 507         inode->i_ctime = current_time(inode);
 508 out_dirty:
 509         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 510         if (!err)
 511                 err = rc;
 512 out_stop:
 513         ext4_journal_stop(handle);
 514         return err;
 515 }
 516 #else
 517 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 518 {
 519         if (projid != EXT4_DEF_PROJID)
 520                 return -EOPNOTSUPP;
 521         return 0;
 522 }
 523 #endif
 524
 525 /* Transfer internal flags to xflags */
 526 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 527 {
 528         __u32 xflags = 0;
 529
 530         if (iflags & EXT4_SYNC_FL)
 531                 xflags |= FS_XFLAG_SYNC;
 532         if (iflags & EXT4_IMMUTABLE_FL)
 533                 xflags |= FS_XFLAG_IMMUTABLE;
 534         if (iflags & EXT4_APPEND_FL)
 535                 xflags |= FS_XFLAG_APPEND;
 536         if (iflags & EXT4_NODUMP_FL)
 537                 xflags |= FS_XFLAG_NODUMP;
 538         if (iflags & EXT4_NOATIME_FL)
 539                 xflags |= FS_XFLAG_NOATIME;
 540         if (iflags & EXT4_PROJINHERIT_FL)
 541                 xflags |= FS_XFLAG_PROJINHERIT;
 542         return xflags;
 543 }
 544
 545 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 546                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 547                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 548
 549 /* Transfer xflags flags to internal */
 550 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 551 {
 552         unsigned long iflags = 0;
 553
 554         if (xflags & FS_XFLAG_SYNC)
 555                 iflags |= EXT4_SYNC_FL;
 556         if (xflags & FS_XFLAG_IMMUTABLE)
 557                 iflags |= EXT4_IMMUTABLE_FL;
 558         if (xflags & FS_XFLAG_APPEND)
 559                 iflags |= EXT4_APPEND_FL;
 560         if (xflags & FS_XFLAG_NODUMP)
 561                 iflags |= EXT4_NODUMP_FL;
 562         if (xflags & FS_XFLAG_NOATIME)
 563                 iflags |= EXT4_NOATIME_FL;
 564         if (xflags & FS_XFLAG_PROJINHERIT)
 565                 iflags |= EXT4_PROJINHERIT_FL;
 566
 567         return iflags;
 568 }
 569
 570 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 571 {
 572         struct ext4_sb_info *sbi = EXT4_SB(sb);
 573         __u32 flags;
 574
 575         if (!capable(CAP_SYS_ADMIN))
 576                 return -EPERM;
 577
 578         if (get_user(flags, (__u32 __user *)arg))
 579                 return -EFAULT;
 580
 581         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 582                 return -EINVAL;
 583
 584         if (ext4_forced_shutdown(sbi))
 585                 return 0;
 586
 587         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 588         trace_ext4_shutdown(sb, flags);
 589
 590         switch (flags) {
 591         case EXT4_GOING_FLAGS_DEFAULT:
 592                 freeze_bdev(sb->s_bdev);
 593                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 594                 thaw_bdev(sb->s_bdev, sb);
 595                 break;
 596         case EXT4_GOING_FLAGS_LOGFLUSH:
 597                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 598                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 599                         (void) ext4_force_commit(sb);
 600                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 601                 }
 602                 break;
 603         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 604                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 605                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 606                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 607                 break;
 608         default:
 609                 return -EINVAL;
 610         }
 611         clear_opt(sb, DISCARD);
 612         return 0;
 613 }
 614
 615 struct getfsmap_info {
 616         struct super_block      *gi_sb;
 617         struct fsmap_head __user *gi_data;
 618         unsigned int            gi_idx;
 619         __u32                   gi_last_flags;
 620 };
 621
 622 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 623 {
 624         struct getfsmap_info *info = priv;
 625         struct fsmap fm;
 626
 627         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 628
 629         info->gi_last_flags = xfm->fmr_flags;
 630         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 631         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 632                         sizeof(struct fsmap)))
 633                 return -EFAULT;
 634
 635         return 0;
 636 }
 637
 638 static int ext4_ioc_getfsmap(struct super_block *sb,
 639                              struct fsmap_head __user *arg)
 640 {
 641         struct getfsmap_info info = { NULL };
 642         struct ext4_fsmap_head xhead = {0};
 643         struct fsmap_head head;
 644         bool aborted = false;
 645         int error;
 646
 647         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 648                 return -EFAULT;
 649         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 650             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 651                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 652             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 653                        sizeof(head.fmh_keys[1].fmr_reserved)))
 654                 return -EINVAL;
 655         /*
 656          * ext4 doesn't report file extents at all, so the only valid
 657          * file offsets are the magic ones (all zeroes or all ones).
 658          */
 659         if (head.fmh_keys[0].fmr_offset ||
 660             (head.fmh_keys[1].fmr_offset != 0 &&
 661              head.fmh_keys[1].fmr_offset != -1ULL))
 662                 return -EINVAL;
 663
 664         xhead.fmh_iflags = head.fmh_iflags;
 665         xhead.fmh_count = head.fmh_count;
 666         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 667         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 668
 669         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 670         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 671
 672         info.gi_sb = sb;
 673         info.gi_data = arg;
 674         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 675         if (error == EXT4_QUERY_RANGE_ABORT) {
 676                 error = 0;
 677                 aborted = true;
 678         } else if (error)
 679                 return error;
 680
 681         /* If we didn't abort, set the "last" flag in the last fmx */
 682         if (!aborted && info.gi_idx) {
 683                 info.gi_last_flags |= FMR_OF_LAST;
 684                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 685                                  &info.gi_last_flags,
 686                                  sizeof(info.gi_last_flags)))
 687                         return -EFAULT;
 688         }
 689
 690         /* copy back header */
 691         head.fmh_entries = xhead.fmh_entries;
 692         head.fmh_oflags = xhead.fmh_oflags;
 693         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 694                 return -EFAULT;
 695
 696         return 0;
 697 }
 698
 699 static long ext4_ioctl_group_add(struct file *file,
 700                                  struct ext4_new_group_data *input)
 701 {
 702         struct super_block *sb = file_inode(file)->i_sb;
 703         int err, err2=0;
 704
 705         err = ext4_resize_begin(sb);
 706         if (err)
 707                 return err;
 708
 709         if (ext4_has_feature_bigalloc(sb)) {
 710                 ext4_msg(sb, KERN_ERR,
 711                          "Online resizing not supported with bigalloc");
 712                 err = -EOPNOTSUPP;
 713                 goto group_add_out;
 714         }
 715
 716         err = mnt_want_write_file(file);
 717         if (err)
 718                 goto group_add_out;
 719
 720         err = ext4_group_add(sb, input);
 721         if (EXT4_SB(sb)->s_journal) {
 722                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 723                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 724                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 725         }
 726         if (err == 0)
 727                 err = err2;
 728         mnt_drop_write_file(file);
 729         if (!err && ext4_has_group_desc_csum(sb) &&
 730             test_opt(sb, INIT_INODE_TABLE))
 731                 err = ext4_register_li_request(sb, input->group);
 732 group_add_out:
 733         ext4_resize_end(sb);
 734         return err;
 735 }
 736
 737 static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
 738 {
 739         struct ext4_inode_info *ei = EXT4_I(inode);
 740
 741         simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
 742                                                       EXT4_FL_USER_VISIBLE));
 743
 744         if (ext4_has_feature_project(inode->i_sb))
 745                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 746 }
 747
 748 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 749 {
 750         struct inode *inode = file_inode(filp);
 751         struct super_block *sb = inode->i_sb;
 752         struct ext4_inode_info *ei = EXT4_I(inode);
 753         unsigned int flags;
 754
 755         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 756
 757         switch (cmd) {
 758         case FS_IOC_GETFSMAP:
 759                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 760         case EXT4_IOC_GETFLAGS:
 761                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 762                 if (S_ISREG(inode->i_mode))
 763                         flags &= ~EXT4_PROJINHERIT_FL;
 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_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                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1096                         err = ext4_handle_dirty_metadata(handle, NULL,
1097                                                          sbi->s_sbh);
1098                 pwsalt_err_journal:
1099                         err2 = ext4_journal_stop(handle);
1100                         if (err2 && !err)
1101                                 err = err2;
1102                 pwsalt_err_exit:
1103                         mnt_drop_write_file(filp);
1104                         if (err)
1105                                 return err;
1106                 }
1107                 if (copy_to_user((void __user *) arg,
1108                                  sbi->s_es->s_encrypt_pw_salt, 16))
1109                         return -EFAULT;
1110                 return 0;
1111 #else
1112                 return -EOPNOTSUPP;
1113 #endif
1114         }
1115         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1116                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1117
1118         case EXT4_IOC_FSGETXATTR:
1119         {
1120                 struct fsxattr fa;
1121
1122                 ext4_fill_fsxattr(inode, &fa);
1123
1124                 if (copy_to_user((struct fsxattr __user *)arg,
1125                                  &fa, sizeof(fa)))
1126                         return -EFAULT;
1127                 return 0;
1128         }
1129         case EXT4_IOC_FSSETXATTR:
1130         {
1131                 struct fsxattr fa, old_fa;
1132                 int err;
1133
1134                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1135                                    sizeof(fa)))
1136                         return -EFAULT;
1137
1138                 /* Make sure caller has proper permission */
1139                 if (!inode_owner_or_capable(inode))
1140                         return -EACCES;
1141
1142                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1143                         return -EOPNOTSUPP;
1144
1145                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1146                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1147                         return -EOPNOTSUPP;
1148
1149                 err = mnt_want_write_file(filp);
1150                 if (err)
1151                         return err;
1152
1153                 inode_lock(inode);
1154                 ext4_fill_fsxattr(inode, &old_fa);
1155                 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1156                 if (err)
1157                         goto out;
1158                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1159                          (flags & EXT4_FL_XFLAG_VISIBLE);
1160                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1161                 if (err)
1162                         goto out;
1163                 err = ext4_ioctl_setflags(inode, flags);
1164                 if (err)
1165                         goto out;
1166                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1167 out:
1168                 inode_unlock(inode);
1169                 mnt_drop_write_file(filp);
1170                 return err;
1171         }
1172         case EXT4_IOC_SHUTDOWN:
1173                 return ext4_shutdown(sb, arg);
1174         default:
1175                 return -ENOTTY;
1176         }
1177 }
1178
1179 #ifdef CONFIG_COMPAT
1180 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1181 {
1182         /* These are just misnamed, they actually get/put from/to user an int */
1183         switch (cmd) {
1184         case EXT4_IOC32_GETFLAGS:
1185                 cmd = EXT4_IOC_GETFLAGS;
1186                 break;
1187         case EXT4_IOC32_SETFLAGS:
1188                 cmd = EXT4_IOC_SETFLAGS;
1189                 break;
1190         case EXT4_IOC32_GETVERSION:
1191                 cmd = EXT4_IOC_GETVERSION;
1192                 break;
1193         case EXT4_IOC32_SETVERSION:
1194                 cmd = EXT4_IOC_SETVERSION;
1195                 break;
1196         case EXT4_IOC32_GROUP_EXTEND:
1197                 cmd = EXT4_IOC_GROUP_EXTEND;
1198                 break;
1199         case EXT4_IOC32_GETVERSION_OLD:
1200                 cmd = EXT4_IOC_GETVERSION_OLD;
1201                 break;
1202         case EXT4_IOC32_SETVERSION_OLD:
1203                 cmd = EXT4_IOC_SETVERSION_OLD;
1204                 break;
1205         case EXT4_IOC32_GETRSVSZ:
1206                 cmd = EXT4_IOC_GETRSVSZ;
1207                 break;
1208         case EXT4_IOC32_SETRSVSZ:
1209                 cmd = EXT4_IOC_SETRSVSZ;
1210                 break;
1211         case EXT4_IOC32_GROUP_ADD: {
1212                 struct compat_ext4_new_group_input __user *uinput;
1213                 struct ext4_new_group_data input;
1214                 int err;
1215
1216                 uinput = compat_ptr(arg);
1217                 err = get_user(input.group, &uinput->group);
1218                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1219                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1220                 err |= get_user(input.inode_table, &uinput->inode_table);
1221                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1222                 err |= get_user(input.reserved_blocks,
1223                                 &uinput->reserved_blocks);
1224                 if (err)
1225                         return -EFAULT;
1226                 return ext4_ioctl_group_add(file, &input);
1227         }
1228         case EXT4_IOC_MOVE_EXT:
1229         case EXT4_IOC_RESIZE_FS:
1230         case EXT4_IOC_PRECACHE_EXTENTS:
1231         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1232         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1233         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1234         case EXT4_IOC_SHUTDOWN:
1235         case FS_IOC_GETFSMAP:
1236                 break;
1237         default:
1238                 return -ENOIOCTLCMD;
1239         }
1240         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1241 }
1242 #endif