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 void ext4_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         ext4_fc_start_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT);
 169
 170         /* Protect extent tree against block allocations via delalloc */
 171         ext4_double_down_write_data_sem(inode, inode_bl);
 172
 173         if (inode_bl->i_nlink == 0) {
 174                 /* this inode has never been used as a BOOT_LOADER */
 175                 set_nlink(inode_bl, 1);
 176                 i_uid_write(inode_bl, 0);
 177                 i_gid_write(inode_bl, 0);
 178                 inode_bl->i_flags = 0;
 179                 ei_bl->i_flags = 0;
 180                 inode_set_iversion(inode_bl, 1);
 181                 i_size_write(inode_bl, 0);
 182                 inode_bl->i_mode = S_IFREG;
 183                 if (ext4_has_feature_extents(sb)) {
 184                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 185                         ext4_ext_tree_init(handle, inode_bl);
 186                 } else
 187                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 188         }
 189
 190         err = dquot_initialize(inode);
 191         if (err)
 192                 goto err_out1;
 193
 194         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 195         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 196         diff = size - size_bl;
 197         swap_inode_data(inode, inode_bl);
 198
 199         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 200
 201         inode->i_generation = prandom_u32();
 202         inode_bl->i_generation = prandom_u32();
 203         ext4_reset_inode_seed(inode);
 204         ext4_reset_inode_seed(inode_bl);
 205
 206         ext4_discard_preallocations(inode, 0);
 207
 208         err = ext4_mark_inode_dirty(handle, inode);
 209         if (err < 0) {
 210                 /* No need to update quota information. */
 211                 ext4_warning(inode->i_sb,
 212                         "couldn't mark inode #%lu dirty (err %d)",
 213                         inode->i_ino, err);
 214                 /* Revert all changes: */
 215                 swap_inode_data(inode, inode_bl);
 216                 ext4_mark_inode_dirty(handle, inode);
 217                 goto err_out1;
 218         }
 219
 220         blocks = inode_bl->i_blocks;
 221         bytes = inode_bl->i_bytes;
 222         inode_bl->i_blocks = inode->i_blocks;
 223         inode_bl->i_bytes = inode->i_bytes;
 224         err = ext4_mark_inode_dirty(handle, inode_bl);
 225         if (err < 0) {
 226                 /* No need to update quota information. */
 227                 ext4_warning(inode_bl->i_sb,
 228                         "couldn't mark inode #%lu dirty (err %d)",
 229                         inode_bl->i_ino, err);
 230                 goto revert;
 231         }
 232
 233         /* Bootloader inode should not be counted into quota information. */
 234         if (diff > 0)
 235                 dquot_free_space(inode, diff);
 236         else
 237                 err = dquot_alloc_space(inode, -1 * diff);
 238
 239         if (err < 0) {
 240 revert:
 241                 /* Revert all changes: */
 242                 inode_bl->i_blocks = blocks;
 243                 inode_bl->i_bytes = bytes;
 244                 swap_inode_data(inode, inode_bl);
 245                 ext4_mark_inode_dirty(handle, inode);
 246                 ext4_mark_inode_dirty(handle, inode_bl);
 247         }
 248
 249 err_out1:
 250         ext4_journal_stop(handle);
 251         ext4_fc_stop_ineligible(sb);
 252         ext4_double_up_write_data_sem(inode, inode_bl);
 253
 254 err_out:
 255         up_write(&EXT4_I(inode)->i_mmap_sem);
 256 journal_err_out:
 257         unlock_two_nondirectories(inode, inode_bl);
 258         iput(inode_bl);
 259         return err;
 260 }
 261
 262 #ifdef CONFIG_FS_ENCRYPTION
 263 static int uuid_is_zero(__u8 u[16])
 264 {
 265         int     i;
 266
 267         for (i = 0; i < 16; i++)
 268                 if (u[i])
 269                         return 0;
 270         return 1;
 271 }
 272 #endif
 273
 274 /*
 275  * If immutable is set and we are not clearing it, we're not allowed to change
 276  * anything else in the inode.  Don't error out if we're only trying to set
 277  * immutable on an immutable file.
 278  */
 279 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 280                                       unsigned int flags)
 281 {
 282         struct ext4_inode_info *ei = EXT4_I(inode);
 283         unsigned int oldflags = ei->i_flags;
 284
 285         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 286                 return 0;
 287
 288         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 289                 return -EPERM;
 290         if (ext4_has_feature_project(inode->i_sb) &&
 291             __kprojid_val(ei->i_projid) != new_projid)
 292                 return -EPERM;
 293
 294         return 0;
 295 }
 296
 297 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 298 {
 299         struct ext4_inode_info *ei = EXT4_I(inode);
 300
 301         if (S_ISDIR(inode->i_mode))
 302                 return;
 303
 304         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 305             test_opt(inode->i_sb, DAX_ALWAYS))
 306                 return;
 307
 308         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 309                 d_mark_dontcache(inode);
 310 }
 311
 312 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 313                            unsigned int flags)
 314 {
 315         /* Allow the DAX flag to be changed on inline directories */
 316         if (S_ISDIR(inode->i_mode)) {
 317                 flags &= ~EXT4_INLINE_DATA_FL;
 318                 oldflags &= ~EXT4_INLINE_DATA_FL;
 319         }
 320
 321         if (flags & EXT4_DAX_FL) {
 322                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 323                      ext4_test_inode_state(inode,
 324                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 325                         return false;
 326                 }
 327         }
 328
 329         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 330                         return false;
 331
 332         return true;
 333 }
 334
 335 static int ext4_ioctl_setflags(struct inode *inode,
 336                                unsigned int flags)
 337 {
 338         struct ext4_inode_info *ei = EXT4_I(inode);
 339         handle_t *handle = NULL;
 340         int err = -EPERM, migrate = 0;
 341         struct ext4_iloc iloc;
 342         unsigned int oldflags, mask, i;
 343         struct super_block *sb = inode->i_sb;
 344
 345         /* Is it quota file? Do not allow user to mess with it */
 346         if (ext4_is_quota_file(inode))
 347                 goto flags_out;
 348
 349         oldflags = ei->i_flags;
 350
 351         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 352         if (err)
 353                 goto flags_out;
 354
 355         /*
 356          * The JOURNAL_DATA flag can only be changed by
 357          * the relevant capability.
 358          */
 359         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 360                 if (!capable(CAP_SYS_RESOURCE))
 361                         goto flags_out;
 362         }
 363
 364         if (!dax_compatible(inode, oldflags, flags)) {
 365                 err = -EOPNOTSUPP;
 366                 goto flags_out;
 367         }
 368
 369         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 370                 migrate = 1;
 371
 372         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 373                 if (!ext4_has_feature_casefold(sb)) {
 374                         err = -EOPNOTSUPP;
 375                         goto flags_out;
 376                 }
 377
 378                 if (!S_ISDIR(inode->i_mode)) {
 379                         err = -ENOTDIR;
 380                         goto flags_out;
 381                 }
 382
 383                 if (!ext4_empty_dir(inode)) {
 384                         err = -ENOTEMPTY;
 385                         goto flags_out;
 386                 }
 387         }
 388
 389         /*
 390          * Wait for all pending directio and then flush all the dirty pages
 391          * for this file.  The flush marks all the pages readonly, so any
 392          * subsequent attempt to write to the file (particularly mmap pages)
 393          * will come through the filesystem and fail.
 394          */
 395         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 396             (flags & EXT4_IMMUTABLE_FL)) {
 397                 inode_dio_wait(inode);
 398                 err = filemap_write_and_wait(inode->i_mapping);
 399                 if (err)
 400                         goto flags_out;
 401         }
 402
 403         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 404         if (IS_ERR(handle)) {
 405                 err = PTR_ERR(handle);
 406                 goto flags_out;
 407         }
 408         if (IS_SYNC(inode))
 409                 ext4_handle_sync(handle);
 410         err = ext4_reserve_inode_write(handle, inode, &iloc);
 411         if (err)
 412                 goto flags_err;
 413
 414         ext4_dax_dontcache(inode, flags);
 415
 416         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 417                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 418                         continue;
 419                 /* These flags get special treatment later */
 420                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 421                         continue;
 422                 if (mask & flags)
 423                         ext4_set_inode_flag(inode, i);
 424                 else
 425                         ext4_clear_inode_flag(inode, i);
 426         }
 427
 428         ext4_set_inode_flags(inode, false);
 429
 430         inode->i_ctime = current_time(inode);
 431
 432         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 433 flags_err:
 434         ext4_journal_stop(handle);
 435         if (err)
 436                 goto flags_out;
 437
 438         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 439                 /*
 440                  * Changes to the journaling mode can cause unsafe changes to
 441                  * S_DAX if the inode is DAX
 442                  */
 443                 if (IS_DAX(inode)) {
 444                         err = -EBUSY;
 445                         goto flags_out;
 446                 }
 447
 448                 err = ext4_change_inode_journal_flag(inode,
 449                                                      flags & EXT4_JOURNAL_DATA_FL);
 450                 if (err)
 451                         goto flags_out;
 452         }
 453         if (migrate) {
 454                 if (flags & EXT4_EXTENTS_FL)
 455                         err = ext4_ext_migrate(inode);
 456                 else
 457                         err = ext4_ind_migrate(inode);
 458         }
 459
 460 flags_out:
 461         return err;
 462 }
 463
 464 #ifdef CONFIG_QUOTA
 465 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 466 {
 467         struct inode *inode = file_inode(filp);
 468         struct super_block *sb = inode->i_sb;
 469         struct ext4_inode_info *ei = EXT4_I(inode);
 470         int err, rc;
 471         handle_t *handle;
 472         kprojid_t kprojid;
 473         struct ext4_iloc iloc;
 474         struct ext4_inode *raw_inode;
 475         struct dquot *transfer_to[MAXQUOTAS] = { };
 476
 477         if (!ext4_has_feature_project(sb)) {
 478                 if (projid != EXT4_DEF_PROJID)
 479                         return -EOPNOTSUPP;
 480                 else
 481                         return 0;
 482         }
 483
 484         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 485                 return -EOPNOTSUPP;
 486
 487         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 488
 489         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 490                 return 0;
 491
 492         err = -EPERM;
 493         /* Is it quota file? Do not allow user to mess with it */
 494         if (ext4_is_quota_file(inode))
 495                 return err;
 496
 497         err = ext4_get_inode_loc(inode, &iloc);
 498         if (err)
 499                 return err;
 500
 501         raw_inode = ext4_raw_inode(&iloc);
 502         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 503                 err = ext4_expand_extra_isize(inode,
 504                                               EXT4_SB(sb)->s_want_extra_isize,
 505                                               &iloc);
 506                 if (err)
 507                         return err;
 508         } else {
 509                 brelse(iloc.bh);
 510         }
 511
 512         err = dquot_initialize(inode);
 513         if (err)
 514                 return err;
 515
 516         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 517                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 518                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 519         if (IS_ERR(handle))
 520                 return PTR_ERR(handle);
 521
 522         err = ext4_reserve_inode_write(handle, inode, &iloc);
 523         if (err)
 524                 goto out_stop;
 525
 526         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 527         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 528
 529                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 530                  * counts xattr inode references.
 531                  */
 532                 down_read(&EXT4_I(inode)->xattr_sem);
 533                 err = __dquot_transfer(inode, transfer_to);
 534                 up_read(&EXT4_I(inode)->xattr_sem);
 535                 dqput(transfer_to[PRJQUOTA]);
 536                 if (err)
 537                         goto out_dirty;
 538         }
 539
 540         EXT4_I(inode)->i_projid = kprojid;
 541         inode->i_ctime = current_time(inode);
 542 out_dirty:
 543         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 544         if (!err)
 545                 err = rc;
 546 out_stop:
 547         ext4_journal_stop(handle);
 548         return err;
 549 }
 550 #else
 551 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 552 {
 553         if (projid != EXT4_DEF_PROJID)
 554                 return -EOPNOTSUPP;
 555         return 0;
 556 }
 557 #endif
 558
 559 /* Transfer internal flags to xflags */
 560 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 561 {
 562         __u32 xflags = 0;
 563
 564         if (iflags & EXT4_SYNC_FL)
 565                 xflags |= FS_XFLAG_SYNC;
 566         if (iflags & EXT4_IMMUTABLE_FL)
 567                 xflags |= FS_XFLAG_IMMUTABLE;
 568         if (iflags & EXT4_APPEND_FL)
 569                 xflags |= FS_XFLAG_APPEND;
 570         if (iflags & EXT4_NODUMP_FL)
 571                 xflags |= FS_XFLAG_NODUMP;
 572         if (iflags & EXT4_NOATIME_FL)
 573                 xflags |= FS_XFLAG_NOATIME;
 574         if (iflags & EXT4_PROJINHERIT_FL)
 575                 xflags |= FS_XFLAG_PROJINHERIT;
 576         if (iflags & EXT4_DAX_FL)
 577                 xflags |= FS_XFLAG_DAX;
 578         return xflags;
 579 }
 580
 581 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 582                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 583                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT | \
 584                                   FS_XFLAG_DAX)
 585
 586 /* Transfer xflags flags to internal */
 587 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 588 {
 589         unsigned long iflags = 0;
 590
 591         if (xflags & FS_XFLAG_SYNC)
 592                 iflags |= EXT4_SYNC_FL;
 593         if (xflags & FS_XFLAG_IMMUTABLE)
 594                 iflags |= EXT4_IMMUTABLE_FL;
 595         if (xflags & FS_XFLAG_APPEND)
 596                 iflags |= EXT4_APPEND_FL;
 597         if (xflags & FS_XFLAG_NODUMP)
 598                 iflags |= EXT4_NODUMP_FL;
 599         if (xflags & FS_XFLAG_NOATIME)
 600                 iflags |= EXT4_NOATIME_FL;
 601         if (xflags & FS_XFLAG_PROJINHERIT)
 602                 iflags |= EXT4_PROJINHERIT_FL;
 603         if (xflags & FS_XFLAG_DAX)
 604                 iflags |= EXT4_DAX_FL;
 605
 606         return iflags;
 607 }
 608
 609 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 610 {
 611         struct ext4_sb_info *sbi = EXT4_SB(sb);
 612         __u32 flags;
 613
 614         if (!capable(CAP_SYS_ADMIN))
 615                 return -EPERM;
 616
 617         if (get_user(flags, (__u32 __user *)arg))
 618                 return -EFAULT;
 619
 620         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 621                 return -EINVAL;
 622
 623         if (ext4_forced_shutdown(sbi))
 624                 return 0;
 625
 626         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 627         trace_ext4_shutdown(sb, flags);
 628
 629         switch (flags) {
 630         case EXT4_GOING_FLAGS_DEFAULT:
 631                 freeze_bdev(sb->s_bdev);
 632                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 633                 thaw_bdev(sb->s_bdev, sb);
 634                 break;
 635         case EXT4_GOING_FLAGS_LOGFLUSH:
 636                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 637                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 638                         (void) ext4_force_commit(sb);
 639                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 640                 }
 641                 break;
 642         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 643                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 644                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 645                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 646                 break;
 647         default:
 648                 return -EINVAL;
 649         }
 650         clear_opt(sb, DISCARD);
 651         return 0;
 652 }
 653
 654 struct getfsmap_info {
 655         struct super_block      *gi_sb;
 656         struct fsmap_head __user *gi_data;
 657         unsigned int            gi_idx;
 658         __u32                   gi_last_flags;
 659 };
 660
 661 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 662 {
 663         struct getfsmap_info *info = priv;
 664         struct fsmap fm;
 665
 666         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 667
 668         info->gi_last_flags = xfm->fmr_flags;
 669         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 670         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 671                         sizeof(struct fsmap)))
 672                 return -EFAULT;
 673
 674         return 0;
 675 }
 676
 677 static int ext4_ioc_getfsmap(struct super_block *sb,
 678                              struct fsmap_head __user *arg)
 679 {
 680         struct getfsmap_info info = { NULL };
 681         struct ext4_fsmap_head xhead = {0};
 682         struct fsmap_head head;
 683         bool aborted = false;
 684         int error;
 685
 686         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 687                 return -EFAULT;
 688         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 689             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 690                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 691             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 692                        sizeof(head.fmh_keys[1].fmr_reserved)))
 693                 return -EINVAL;
 694         /*
 695          * ext4 doesn't report file extents at all, so the only valid
 696          * file offsets are the magic ones (all zeroes or all ones).
 697          */
 698         if (head.fmh_keys[0].fmr_offset ||
 699             (head.fmh_keys[1].fmr_offset != 0 &&
 700              head.fmh_keys[1].fmr_offset != -1ULL))
 701                 return -EINVAL;
 702
 703         xhead.fmh_iflags = head.fmh_iflags;
 704         xhead.fmh_count = head.fmh_count;
 705         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 706         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 707
 708         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 709         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 710
 711         info.gi_sb = sb;
 712         info.gi_data = arg;
 713         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 714         if (error == EXT4_QUERY_RANGE_ABORT) {
 715                 error = 0;
 716                 aborted = true;
 717         } else if (error)
 718                 return error;
 719
 720         /* If we didn't abort, set the "last" flag in the last fmx */
 721         if (!aborted && info.gi_idx) {
 722                 info.gi_last_flags |= FMR_OF_LAST;
 723                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 724                                  &info.gi_last_flags,
 725                                  sizeof(info.gi_last_flags)))
 726                         return -EFAULT;
 727         }
 728
 729         /* copy back header */
 730         head.fmh_entries = xhead.fmh_entries;
 731         head.fmh_oflags = xhead.fmh_oflags;
 732         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 733                 return -EFAULT;
 734
 735         return 0;
 736 }
 737
 738 static long ext4_ioctl_group_add(struct file *file,
 739                                  struct ext4_new_group_data *input)
 740 {
 741         struct super_block *sb = file_inode(file)->i_sb;
 742         int err, err2=0;
 743
 744         err = ext4_resize_begin(sb);
 745         if (err)
 746                 return err;
 747
 748         if (ext4_has_feature_bigalloc(sb)) {
 749                 ext4_msg(sb, KERN_ERR,
 750                          "Online resizing not supported with bigalloc");
 751                 err = -EOPNOTSUPP;
 752                 goto group_add_out;
 753         }
 754
 755         err = mnt_want_write_file(file);
 756         if (err)
 757                 goto group_add_out;
 758
 759         err = ext4_group_add(sb, input);
 760         if (EXT4_SB(sb)->s_journal) {
 761                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 762                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 763                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 764         }
 765         if (err == 0)
 766                 err = err2;
 767         mnt_drop_write_file(file);
 768         if (!err && ext4_has_group_desc_csum(sb) &&
 769             test_opt(sb, INIT_INODE_TABLE))
 770                 err = ext4_register_li_request(sb, input->group);
 771 group_add_out:
 772         ext4_resize_end(sb);
 773         return err;
 774 }
 775
 776 static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
 777 {
 778         struct ext4_inode_info *ei = EXT4_I(inode);
 779
 780         simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
 781                                                       EXT4_FL_USER_VISIBLE));
 782
 783         if (ext4_has_feature_project(inode->i_sb))
 784                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 785 }
 786
 787 /* So that the fiemap access checks can't overflow on 32 bit machines. */
 788 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
 789
 790 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
 791 {
 792         struct fiemap fiemap;
 793         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 794         struct fiemap_extent_info fieinfo = { 0, };
 795         struct inode *inode = file_inode(filp);
 796         int error;
 797
 798         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 799                 return -EFAULT;
 800
 801         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 802                 return -EINVAL;
 803
 804         fieinfo.fi_flags = fiemap.fm_flags;
 805         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 806         fieinfo.fi_extents_start = ufiemap->fm_extents;
 807
 808         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
 809                         fiemap.fm_length);
 810         fiemap.fm_flags = fieinfo.fi_flags;
 811         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 812         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 813                 error = -EFAULT;
 814
 815         return error;
 816 }
 817
 818 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 819 {
 820         struct inode *inode = file_inode(filp);
 821         struct super_block *sb = inode->i_sb;
 822         struct ext4_inode_info *ei = EXT4_I(inode);
 823         unsigned int flags;
 824
 825         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 826
 827         switch (cmd) {
 828         case FS_IOC_GETFSMAP:
 829                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 830         case FS_IOC_GETFLAGS:
 831                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 832                 if (S_ISREG(inode->i_mode))
 833                         flags &= ~EXT4_PROJINHERIT_FL;
 834                 return put_user(flags, (int __user *) arg);
 835         case FS_IOC_SETFLAGS: {
 836                 int err;
 837
 838                 if (!inode_owner_or_capable(inode))
 839                         return -EACCES;
 840
 841                 if (get_user(flags, (int __user *) arg))
 842                         return -EFAULT;
 843
 844                 if (flags & ~EXT4_FL_USER_VISIBLE)
 845                         return -EOPNOTSUPP;
 846                 /*
 847                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 848                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 849                  * more restrictive than just silently masking off visible but
 850                  * not settable flags as we always did.
 851                  */
 852                 flags &= EXT4_FL_USER_MODIFIABLE;
 853                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 854                         return -EOPNOTSUPP;
 855
 856                 err = mnt_want_write_file(filp);
 857                 if (err)
 858                         return err;
 859
 860                 inode_lock(inode);
 861                 err = ext4_ioctl_check_immutable(inode,
 862                                 from_kprojid(&init_user_ns, ei->i_projid),
 863                                 flags);
 864                 if (!err)
 865                         err = ext4_ioctl_setflags(inode, flags);
 866                 inode_unlock(inode);
 867                 mnt_drop_write_file(filp);
 868                 return err;
 869         }
 870         case EXT4_IOC_GETVERSION:
 871         case EXT4_IOC_GETVERSION_OLD:
 872                 return put_user(inode->i_generation, (int __user *) arg);
 873         case EXT4_IOC_SETVERSION:
 874         case EXT4_IOC_SETVERSION_OLD: {
 875                 handle_t *handle;
 876                 struct ext4_iloc iloc;
 877                 __u32 generation;
 878                 int err;
 879
 880                 if (!inode_owner_or_capable(inode))
 881                         return -EPERM;
 882
 883                 if (ext4_has_metadata_csum(inode->i_sb)) {
 884                         ext4_warning(sb, "Setting inode version is not "
 885                                      "supported with metadata_csum enabled.");
 886                         return -ENOTTY;
 887                 }
 888
 889                 err = mnt_want_write_file(filp);
 890                 if (err)
 891                         return err;
 892                 if (get_user(generation, (int __user *) arg)) {
 893                         err = -EFAULT;
 894                         goto setversion_out;
 895                 }
 896
 897                 inode_lock(inode);
 898                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 899                 if (IS_ERR(handle)) {
 900                         err = PTR_ERR(handle);
 901                         goto unlock_out;
 902                 }
 903                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 904                 if (err == 0) {
 905                         inode->i_ctime = current_time(inode);
 906                         inode->i_generation = generation;
 907                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 908                 }
 909                 ext4_journal_stop(handle);
 910
 911 unlock_out:
 912                 inode_unlock(inode);
 913 setversion_out:
 914                 mnt_drop_write_file(filp);
 915                 return err;
 916         }
 917         case EXT4_IOC_GROUP_EXTEND: {
 918                 ext4_fsblk_t n_blocks_count;
 919                 int err, err2=0;
 920
 921                 err = ext4_resize_begin(sb);
 922                 if (err)
 923                         return err;
 924
 925                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 926                         err = -EFAULT;
 927                         goto group_extend_out;
 928                 }
 929
 930                 if (ext4_has_feature_bigalloc(sb)) {
 931                         ext4_msg(sb, KERN_ERR,
 932                                  "Online resizing not supported with bigalloc");
 933                         err = -EOPNOTSUPP;
 934                         goto group_extend_out;
 935                 }
 936
 937                 err = mnt_want_write_file(filp);
 938                 if (err)
 939                         goto group_extend_out;
 940
 941                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 942                 if (EXT4_SB(sb)->s_journal) {
 943                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 944                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 945                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 946                 }
 947                 if (err == 0)
 948                         err = err2;
 949                 mnt_drop_write_file(filp);
 950 group_extend_out:
 951                 ext4_resize_end(sb);
 952                 return err;
 953         }
 954
 955         case EXT4_IOC_MOVE_EXT: {
 956                 struct move_extent me;
 957                 struct fd donor;
 958                 int err;
 959
 960                 if (!(filp->f_mode & FMODE_READ) ||
 961                     !(filp->f_mode & FMODE_WRITE))
 962                         return -EBADF;
 963
 964                 if (copy_from_user(&me,
 965                         (struct move_extent __user *)arg, sizeof(me)))
 966                         return -EFAULT;
 967                 me.moved_len = 0;
 968
 969                 donor = fdget(me.donor_fd);
 970                 if (!donor.file)
 971                         return -EBADF;
 972
 973                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 974                         err = -EBADF;
 975                         goto mext_out;
 976                 }
 977
 978                 if (ext4_has_feature_bigalloc(sb)) {
 979                         ext4_msg(sb, KERN_ERR,
 980                                  "Online defrag not supported with bigalloc");
 981                         err = -EOPNOTSUPP;
 982                         goto mext_out;
 983                 } else if (IS_DAX(inode)) {
 984                         ext4_msg(sb, KERN_ERR,
 985                                  "Online defrag not supported with DAX");
 986                         err = -EOPNOTSUPP;
 987                         goto mext_out;
 988                 }
 989
 990                 err = mnt_want_write_file(filp);
 991                 if (err)
 992                         goto mext_out;
 993
 994                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 995                                         me.donor_start, me.len, &me.moved_len);
 996                 mnt_drop_write_file(filp);
 997
 998                 if (copy_to_user((struct move_extent __user *)arg,
 999                                  &me, sizeof(me)))
1000                         err = -EFAULT;
1001 mext_out:
1002                 fdput(donor);
1003                 return err;
1004         }
1005
1006         case EXT4_IOC_GROUP_ADD: {
1007                 struct ext4_new_group_data input;
1008
1009                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1010                                 sizeof(input)))
1011                         return -EFAULT;
1012
1013                 return ext4_ioctl_group_add(filp, &input);
1014         }
1015
1016         case EXT4_IOC_MIGRATE:
1017         {
1018                 int err;
1019                 if (!inode_owner_or_capable(inode))
1020                         return -EACCES;
1021
1022                 err = mnt_want_write_file(filp);
1023                 if (err)
1024                         return err;
1025                 /*
1026                  * inode_mutex prevent write and truncate on the file.
1027                  * Read still goes through. We take i_data_sem in
1028                  * ext4_ext_swap_inode_data before we switch the
1029                  * inode format to prevent read.
1030                  */
1031                 inode_lock((inode));
1032                 err = ext4_ext_migrate(inode);
1033                 inode_unlock((inode));
1034                 mnt_drop_write_file(filp);
1035                 return err;
1036         }
1037
1038         case EXT4_IOC_ALLOC_DA_BLKS:
1039         {
1040                 int err;
1041                 if (!inode_owner_or_capable(inode))
1042                         return -EACCES;
1043
1044                 err = mnt_want_write_file(filp);
1045                 if (err)
1046                         return err;
1047                 err = ext4_alloc_da_blocks(inode);
1048                 mnt_drop_write_file(filp);
1049                 return err;
1050         }
1051
1052         case EXT4_IOC_SWAP_BOOT:
1053         {
1054                 int err;
1055                 if (!(filp->f_mode & FMODE_WRITE))
1056                         return -EBADF;
1057                 err = mnt_want_write_file(filp);
1058                 if (err)
1059                         return err;
1060                 err = swap_inode_boot_loader(sb, inode);
1061                 mnt_drop_write_file(filp);
1062                 return err;
1063         }
1064
1065         case EXT4_IOC_RESIZE_FS: {
1066                 ext4_fsblk_t n_blocks_count;
1067                 int err = 0, err2 = 0;
1068                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1069
1070                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1071                                    sizeof(__u64))) {
1072                         return -EFAULT;
1073                 }
1074
1075                 err = ext4_resize_begin(sb);
1076                 if (err)
1077                         return err;
1078
1079                 err = mnt_want_write_file(filp);
1080                 if (err)
1081                         goto resizefs_out;
1082
1083                 err = ext4_resize_fs(sb, n_blocks_count);
1084                 if (EXT4_SB(sb)->s_journal) {
1085                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE);
1086                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1087                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1088                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1089                 }
1090                 if (err == 0)
1091                         err = err2;
1092                 mnt_drop_write_file(filp);
1093                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1094                     ext4_has_group_desc_csum(sb) &&
1095                     test_opt(sb, INIT_INODE_TABLE))
1096                         err = ext4_register_li_request(sb, o_group);
1097
1098 resizefs_out:
1099                 ext4_resize_end(sb);
1100                 return err;
1101         }
1102
1103         case FITRIM:
1104         {
1105                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1106                 struct fstrim_range range;
1107                 int ret = 0;
1108
1109                 if (!capable(CAP_SYS_ADMIN))
1110                         return -EPERM;
1111
1112                 if (!blk_queue_discard(q))
1113                         return -EOPNOTSUPP;
1114
1115                 /*
1116                  * We haven't replayed the journal, so we cannot use our
1117                  * block-bitmap-guided storage zapping commands.
1118                  */
1119                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1120                         return -EROFS;
1121
1122                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1123                     sizeof(range)))
1124                         return -EFAULT;
1125
1126                 ret = ext4_trim_fs(sb, &range);
1127                 if (ret < 0)
1128                         return ret;
1129
1130                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1131                     sizeof(range)))
1132                         return -EFAULT;
1133
1134                 return 0;
1135         }
1136         case EXT4_IOC_PRECACHE_EXTENTS:
1137                 return ext4_ext_precache(inode);
1138
1139         case FS_IOC_SET_ENCRYPTION_POLICY:
1140                 if (!ext4_has_feature_encrypt(sb))
1141                         return -EOPNOTSUPP;
1142                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1143
1144         case FS_IOC_GET_ENCRYPTION_PWSALT: {
1145 #ifdef CONFIG_FS_ENCRYPTION
1146                 int err, err2;
1147                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1148                 handle_t *handle;
1149
1150                 if (!ext4_has_feature_encrypt(sb))
1151                         return -EOPNOTSUPP;
1152                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1153                         err = mnt_want_write_file(filp);
1154                         if (err)
1155                                 return err;
1156                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1157                         if (IS_ERR(handle)) {
1158                                 err = PTR_ERR(handle);
1159                                 goto pwsalt_err_exit;
1160                         }
1161                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1162                         if (err)
1163                                 goto pwsalt_err_journal;
1164                         lock_buffer(sbi->s_sbh);
1165                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1166                         ext4_superblock_csum_set(sb);
1167                         unlock_buffer(sbi->s_sbh);
1168                         err = ext4_handle_dirty_metadata(handle, NULL,
1169                                                          sbi->s_sbh);
1170                 pwsalt_err_journal:
1171                         err2 = ext4_journal_stop(handle);
1172                         if (err2 && !err)
1173                                 err = err2;
1174                 pwsalt_err_exit:
1175                         mnt_drop_write_file(filp);
1176                         if (err)
1177                                 return err;
1178                 }
1179                 if (copy_to_user((void __user *) arg,
1180                                  sbi->s_es->s_encrypt_pw_salt, 16))
1181                         return -EFAULT;
1182                 return 0;
1183 #else
1184                 return -EOPNOTSUPP;
1185 #endif
1186         }
1187         case FS_IOC_GET_ENCRYPTION_POLICY:
1188                 if (!ext4_has_feature_encrypt(sb))
1189                         return -EOPNOTSUPP;
1190                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1191
1192         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1193                 if (!ext4_has_feature_encrypt(sb))
1194                         return -EOPNOTSUPP;
1195                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1196
1197         case FS_IOC_ADD_ENCRYPTION_KEY:
1198                 if (!ext4_has_feature_encrypt(sb))
1199                         return -EOPNOTSUPP;
1200                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1201
1202         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1203                 if (!ext4_has_feature_encrypt(sb))
1204                         return -EOPNOTSUPP;
1205                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1206
1207         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1208                 if (!ext4_has_feature_encrypt(sb))
1209                         return -EOPNOTSUPP;
1210                 return fscrypt_ioctl_remove_key_all_users(filp,
1211                                                           (void __user *)arg);
1212         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1213                 if (!ext4_has_feature_encrypt(sb))
1214                         return -EOPNOTSUPP;
1215                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1216
1217         case FS_IOC_GET_ENCRYPTION_NONCE:
1218                 if (!ext4_has_feature_encrypt(sb))
1219                         return -EOPNOTSUPP;
1220                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1221
1222         case EXT4_IOC_CLEAR_ES_CACHE:
1223         {
1224                 if (!inode_owner_or_capable(inode))
1225                         return -EACCES;
1226                 ext4_clear_inode_es(inode);
1227                 return 0;
1228         }
1229
1230         case EXT4_IOC_GETSTATE:
1231         {
1232                 __u32   state = 0;
1233
1234                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1235                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1236                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1237                         state |= EXT4_STATE_FLAG_NEW;
1238                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1239                         state |= EXT4_STATE_FLAG_NEWENTRY;
1240                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1241                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1242
1243                 return put_user(state, (__u32 __user *) arg);
1244         }
1245
1246         case EXT4_IOC_GET_ES_CACHE:
1247                 return ext4_ioctl_get_es_cache(filp, arg);
1248
1249         case FS_IOC_FSGETXATTR:
1250         {
1251                 struct fsxattr fa;
1252
1253                 ext4_fill_fsxattr(inode, &fa);
1254
1255                 if (copy_to_user((struct fsxattr __user *)arg,
1256                                  &fa, sizeof(fa)))
1257                         return -EFAULT;
1258                 return 0;
1259         }
1260         case FS_IOC_FSSETXATTR:
1261         {
1262                 struct fsxattr fa, old_fa;
1263                 int err;
1264
1265                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1266                                    sizeof(fa)))
1267                         return -EFAULT;
1268
1269                 /* Make sure caller has proper permission */
1270                 if (!inode_owner_or_capable(inode))
1271                         return -EACCES;
1272
1273                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1274                         return -EOPNOTSUPP;
1275
1276                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1277                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1278                         return -EOPNOTSUPP;
1279
1280                 err = mnt_want_write_file(filp);
1281                 if (err)
1282                         return err;
1283
1284                 inode_lock(inode);
1285                 ext4_fill_fsxattr(inode, &old_fa);
1286                 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1287                 if (err)
1288                         goto out;
1289                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1290                          (flags & EXT4_FL_XFLAG_VISIBLE);
1291                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1292                 if (err)
1293                         goto out;
1294                 err = ext4_ioctl_setflags(inode, flags);
1295                 if (err)
1296                         goto out;
1297                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1298 out:
1299                 inode_unlock(inode);
1300                 mnt_drop_write_file(filp);
1301                 return err;
1302         }
1303         case EXT4_IOC_SHUTDOWN:
1304                 return ext4_shutdown(sb, arg);
1305
1306         case FS_IOC_ENABLE_VERITY:
1307                 if (!ext4_has_feature_verity(sb))
1308                         return -EOPNOTSUPP;
1309                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1310
1311         case FS_IOC_MEASURE_VERITY:
1312                 if (!ext4_has_feature_verity(sb))
1313                         return -EOPNOTSUPP;
1314                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1315
1316         default:
1317                 return -ENOTTY;
1318         }
1319 }
1320
1321 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1322 {
1323         long ret;
1324
1325         ext4_fc_start_update(file_inode(filp));
1326         ret = __ext4_ioctl(filp, cmd, arg);
1327         ext4_fc_stop_update(file_inode(filp));
1328
1329         return ret;
1330 }
1331
1332 #ifdef CONFIG_COMPAT
1333 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1334 {
1335         /* These are just misnamed, they actually get/put from/to user an int */
1336         switch (cmd) {
1337         case FS_IOC32_GETFLAGS:
1338                 cmd = FS_IOC_GETFLAGS;
1339                 break;
1340         case FS_IOC32_SETFLAGS:
1341                 cmd = FS_IOC_SETFLAGS;
1342                 break;
1343         case EXT4_IOC32_GETVERSION:
1344                 cmd = EXT4_IOC_GETVERSION;
1345                 break;
1346         case EXT4_IOC32_SETVERSION:
1347                 cmd = EXT4_IOC_SETVERSION;
1348                 break;
1349         case EXT4_IOC32_GROUP_EXTEND:
1350                 cmd = EXT4_IOC_GROUP_EXTEND;
1351                 break;
1352         case EXT4_IOC32_GETVERSION_OLD:
1353                 cmd = EXT4_IOC_GETVERSION_OLD;
1354                 break;
1355         case EXT4_IOC32_SETVERSION_OLD:
1356                 cmd = EXT4_IOC_SETVERSION_OLD;
1357                 break;
1358         case EXT4_IOC32_GETRSVSZ:
1359                 cmd = EXT4_IOC_GETRSVSZ;
1360                 break;
1361         case EXT4_IOC32_SETRSVSZ:
1362                 cmd = EXT4_IOC_SETRSVSZ;
1363                 break;
1364         case EXT4_IOC32_GROUP_ADD: {
1365                 struct compat_ext4_new_group_input __user *uinput;
1366                 struct ext4_new_group_data input;
1367                 int err;
1368
1369                 uinput = compat_ptr(arg);
1370                 err = get_user(input.group, &uinput->group);
1371                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1372                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1373                 err |= get_user(input.inode_table, &uinput->inode_table);
1374                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1375                 err |= get_user(input.reserved_blocks,
1376                                 &uinput->reserved_blocks);
1377                 if (err)
1378                         return -EFAULT;
1379                 return ext4_ioctl_group_add(file, &input);
1380         }
1381         case EXT4_IOC_MOVE_EXT:
1382         case EXT4_IOC_RESIZE_FS:
1383         case FITRIM:
1384         case EXT4_IOC_PRECACHE_EXTENTS:
1385         case FS_IOC_SET_ENCRYPTION_POLICY:
1386         case FS_IOC_GET_ENCRYPTION_PWSALT:
1387         case FS_IOC_GET_ENCRYPTION_POLICY:
1388         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1389         case FS_IOC_ADD_ENCRYPTION_KEY:
1390         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1391         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1392         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1393         case FS_IOC_GET_ENCRYPTION_NONCE:
1394         case EXT4_IOC_SHUTDOWN:
1395         case FS_IOC_GETFSMAP:
1396         case FS_IOC_ENABLE_VERITY:
1397         case FS_IOC_MEASURE_VERITY:
1398         case EXT4_IOC_CLEAR_ES_CACHE:
1399         case EXT4_IOC_GETSTATE:
1400         case EXT4_IOC_GET_ES_CACHE:
1401         case FS_IOC_FSGETXATTR:
1402         case FS_IOC_FSSETXATTR:
1403                 break;
1404         default:
1405                 return -ENOIOCTLCMD;
1406         }
1407         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1408 }
1409 #endif