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  * @mnt_userns: user namespace of the mount the inode was found from
 111  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 112  *
 113  */
 114 static long swap_inode_boot_loader(struct super_block *sb,
 115                                 struct user_namespace *mnt_userns,
 116                                 struct inode *inode)
 117 {
 118         handle_t *handle;
 119         int err;
 120         struct inode *inode_bl;
 121         struct ext4_inode_info *ei_bl;
 122         qsize_t size, size_bl, diff;
 123         blkcnt_t blocks;
 124         unsigned short bytes;
 125
 126         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 127         if (IS_ERR(inode_bl))
 128                 return PTR_ERR(inode_bl);
 129         ei_bl = EXT4_I(inode_bl);
 130
 131         /* Protect orig inodes against a truncate and make sure,
 132          * that only 1 swap_inode_boot_loader is running. */
 133         lock_two_nondirectories(inode, inode_bl);
 134
 135         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 136             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 137             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 138             ext4_has_inline_data(inode)) {
 139                 err = -EINVAL;
 140                 goto journal_err_out;
 141         }
 142
 143         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 144             !inode_owner_or_capable(mnt_userns, inode) ||
 145             !capable(CAP_SYS_ADMIN)) {
 146                 err = -EPERM;
 147                 goto journal_err_out;
 148         }
 149
 150         down_write(&EXT4_I(inode)->i_mmap_sem);
 151         err = filemap_write_and_wait(inode->i_mapping);
 152         if (err)
 153                 goto err_out;
 154
 155         err = filemap_write_and_wait(inode_bl->i_mapping);
 156         if (err)
 157                 goto err_out;
 158
 159         /* Wait for all existing dio workers */
 160         inode_dio_wait(inode);
 161         inode_dio_wait(inode_bl);
 162
 163         truncate_inode_pages(&inode->i_data, 0);
 164         truncate_inode_pages(&inode_bl->i_data, 0);
 165
 166         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 167         if (IS_ERR(handle)) {
 168                 err = -EINVAL;
 169                 goto err_out;
 170         }
 171         ext4_fc_start_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT);
 172
 173         /* Protect extent tree against block allocations via delalloc */
 174         ext4_double_down_write_data_sem(inode, inode_bl);
 175
 176         if (inode_bl->i_nlink == 0) {
 177                 /* this inode has never been used as a BOOT_LOADER */
 178                 set_nlink(inode_bl, 1);
 179                 i_uid_write(inode_bl, 0);
 180                 i_gid_write(inode_bl, 0);
 181                 inode_bl->i_flags = 0;
 182                 ei_bl->i_flags = 0;
 183                 inode_set_iversion(inode_bl, 1);
 184                 i_size_write(inode_bl, 0);
 185                 inode_bl->i_mode = S_IFREG;
 186                 if (ext4_has_feature_extents(sb)) {
 187                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 188                         ext4_ext_tree_init(handle, inode_bl);
 189                 } else
 190                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 191         }
 192
 193         err = dquot_initialize(inode);
 194         if (err)
 195                 goto err_out1;
 196
 197         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 198         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 199         diff = size - size_bl;
 200         swap_inode_data(inode, inode_bl);
 201
 202         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 203
 204         inode->i_generation = prandom_u32();
 205         inode_bl->i_generation = prandom_u32();
 206         ext4_reset_inode_seed(inode);
 207         ext4_reset_inode_seed(inode_bl);
 208
 209         ext4_discard_preallocations(inode, 0);
 210
 211         err = ext4_mark_inode_dirty(handle, inode);
 212         if (err < 0) {
 213                 /* No need to update quota information. */
 214                 ext4_warning(inode->i_sb,
 215                         "couldn't mark inode #%lu dirty (err %d)",
 216                         inode->i_ino, err);
 217                 /* Revert all changes: */
 218                 swap_inode_data(inode, inode_bl);
 219                 ext4_mark_inode_dirty(handle, inode);
 220                 goto err_out1;
 221         }
 222
 223         blocks = inode_bl->i_blocks;
 224         bytes = inode_bl->i_bytes;
 225         inode_bl->i_blocks = inode->i_blocks;
 226         inode_bl->i_bytes = inode->i_bytes;
 227         err = ext4_mark_inode_dirty(handle, inode_bl);
 228         if (err < 0) {
 229                 /* No need to update quota information. */
 230                 ext4_warning(inode_bl->i_sb,
 231                         "couldn't mark inode #%lu dirty (err %d)",
 232                         inode_bl->i_ino, err);
 233                 goto revert;
 234         }
 235
 236         /* Bootloader inode should not be counted into quota information. */
 237         if (diff > 0)
 238                 dquot_free_space(inode, diff);
 239         else
 240                 err = dquot_alloc_space(inode, -1 * diff);
 241
 242         if (err < 0) {
 243 revert:
 244                 /* Revert all changes: */
 245                 inode_bl->i_blocks = blocks;
 246                 inode_bl->i_bytes = bytes;
 247                 swap_inode_data(inode, inode_bl);
 248                 ext4_mark_inode_dirty(handle, inode);
 249                 ext4_mark_inode_dirty(handle, inode_bl);
 250         }
 251
 252 err_out1:
 253         ext4_journal_stop(handle);
 254         ext4_fc_stop_ineligible(sb);
 255         ext4_double_up_write_data_sem(inode, inode_bl);
 256
 257 err_out:
 258         up_write(&EXT4_I(inode)->i_mmap_sem);
 259 journal_err_out:
 260         unlock_two_nondirectories(inode, inode_bl);
 261         iput(inode_bl);
 262         return err;
 263 }
 264
 265 #ifdef CONFIG_FS_ENCRYPTION
 266 static int uuid_is_zero(__u8 u[16])
 267 {
 268         int     i;
 269
 270         for (i = 0; i < 16; i++)
 271                 if (u[i])
 272                         return 0;
 273         return 1;
 274 }
 275 #endif
 276
 277 /*
 278  * If immutable is set and we are not clearing it, we're not allowed to change
 279  * anything else in the inode.  Don't error out if we're only trying to set
 280  * immutable on an immutable file.
 281  */
 282 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 283                                       unsigned int flags)
 284 {
 285         struct ext4_inode_info *ei = EXT4_I(inode);
 286         unsigned int oldflags = ei->i_flags;
 287
 288         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 289                 return 0;
 290
 291         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 292                 return -EPERM;
 293         if (ext4_has_feature_project(inode->i_sb) &&
 294             __kprojid_val(ei->i_projid) != new_projid)
 295                 return -EPERM;
 296
 297         return 0;
 298 }
 299
 300 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 301 {
 302         struct ext4_inode_info *ei = EXT4_I(inode);
 303
 304         if (S_ISDIR(inode->i_mode))
 305                 return;
 306
 307         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 308             test_opt(inode->i_sb, DAX_ALWAYS))
 309                 return;
 310
 311         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 312                 d_mark_dontcache(inode);
 313 }
 314
 315 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 316                            unsigned int flags)
 317 {
 318         if (flags & EXT4_DAX_FL) {
 319                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 320                      ext4_test_inode_state(inode,
 321                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 322                         return false;
 323                 }
 324         }
 325
 326         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 327                         return false;
 328
 329         return true;
 330 }
 331
 332 static int ext4_ioctl_setflags(struct inode *inode,
 333                                unsigned int flags)
 334 {
 335         struct ext4_inode_info *ei = EXT4_I(inode);
 336         handle_t *handle = NULL;
 337         int err = -EPERM, migrate = 0;
 338         struct ext4_iloc iloc;
 339         unsigned int oldflags, mask, i;
 340         struct super_block *sb = inode->i_sb;
 341
 342         /* Is it quota file? Do not allow user to mess with it */
 343         if (ext4_is_quota_file(inode))
 344                 goto flags_out;
 345
 346         oldflags = ei->i_flags;
 347
 348         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 349         if (err)
 350                 goto flags_out;
 351
 352         /*
 353          * The JOURNAL_DATA flag can only be changed by
 354          * the relevant capability.
 355          */
 356         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 357                 if (!capable(CAP_SYS_RESOURCE))
 358                         goto flags_out;
 359         }
 360
 361         if (!dax_compatible(inode, oldflags, flags)) {
 362                 err = -EOPNOTSUPP;
 363                 goto flags_out;
 364         }
 365
 366         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 367                 migrate = 1;
 368
 369         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 370                 if (!ext4_has_feature_casefold(sb)) {
 371                         err = -EOPNOTSUPP;
 372                         goto flags_out;
 373                 }
 374
 375                 if (!S_ISDIR(inode->i_mode)) {
 376                         err = -ENOTDIR;
 377                         goto flags_out;
 378                 }
 379
 380                 if (!ext4_empty_dir(inode)) {
 381                         err = -ENOTEMPTY;
 382                         goto flags_out;
 383                 }
 384         }
 385
 386         /*
 387          * Wait for all pending directio and then flush all the dirty pages
 388          * for this file.  The flush marks all the pages readonly, so any
 389          * subsequent attempt to write to the file (particularly mmap pages)
 390          * will come through the filesystem and fail.
 391          */
 392         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 393             (flags & EXT4_IMMUTABLE_FL)) {
 394                 inode_dio_wait(inode);
 395                 err = filemap_write_and_wait(inode->i_mapping);
 396                 if (err)
 397                         goto flags_out;
 398         }
 399
 400         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 401         if (IS_ERR(handle)) {
 402                 err = PTR_ERR(handle);
 403                 goto flags_out;
 404         }
 405         if (IS_SYNC(inode))
 406                 ext4_handle_sync(handle);
 407         err = ext4_reserve_inode_write(handle, inode, &iloc);
 408         if (err)
 409                 goto flags_err;
 410
 411         ext4_dax_dontcache(inode, flags);
 412
 413         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 414                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 415                         continue;
 416                 /* These flags get special treatment later */
 417                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 418                         continue;
 419                 if (mask & flags)
 420                         ext4_set_inode_flag(inode, i);
 421                 else
 422                         ext4_clear_inode_flag(inode, i);
 423         }
 424
 425         ext4_set_inode_flags(inode, false);
 426
 427         inode->i_ctime = current_time(inode);
 428
 429         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 430 flags_err:
 431         ext4_journal_stop(handle);
 432         if (err)
 433                 goto flags_out;
 434
 435         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 436                 /*
 437                  * Changes to the journaling mode can cause unsafe changes to
 438                  * S_DAX if the inode is DAX
 439                  */
 440                 if (IS_DAX(inode)) {
 441                         err = -EBUSY;
 442                         goto flags_out;
 443                 }
 444
 445                 err = ext4_change_inode_journal_flag(inode,
 446                                                      flags & EXT4_JOURNAL_DATA_FL);
 447                 if (err)
 448                         goto flags_out;
 449         }
 450         if (migrate) {
 451                 if (flags & EXT4_EXTENTS_FL)
 452                         err = ext4_ext_migrate(inode);
 453                 else
 454                         err = ext4_ind_migrate(inode);
 455         }
 456
 457 flags_out:
 458         return err;
 459 }
 460
 461 #ifdef CONFIG_QUOTA
 462 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 463 {
 464         struct inode *inode = file_inode(filp);
 465         struct super_block *sb = inode->i_sb;
 466         struct ext4_inode_info *ei = EXT4_I(inode);
 467         int err, rc;
 468         handle_t *handle;
 469         kprojid_t kprojid;
 470         struct ext4_iloc iloc;
 471         struct ext4_inode *raw_inode;
 472         struct dquot *transfer_to[MAXQUOTAS] = { };
 473
 474         if (!ext4_has_feature_project(sb)) {
 475                 if (projid != EXT4_DEF_PROJID)
 476                         return -EOPNOTSUPP;
 477                 else
 478                         return 0;
 479         }
 480
 481         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 482                 return -EOPNOTSUPP;
 483
 484         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 485
 486         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 487                 return 0;
 488
 489         err = -EPERM;
 490         /* Is it quota file? Do not allow user to mess with it */
 491         if (ext4_is_quota_file(inode))
 492                 return err;
 493
 494         err = ext4_get_inode_loc(inode, &iloc);
 495         if (err)
 496                 return err;
 497
 498         raw_inode = ext4_raw_inode(&iloc);
 499         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 500                 err = ext4_expand_extra_isize(inode,
 501                                               EXT4_SB(sb)->s_want_extra_isize,
 502                                               &iloc);
 503                 if (err)
 504                         return err;
 505         } else {
 506                 brelse(iloc.bh);
 507         }
 508
 509         err = dquot_initialize(inode);
 510         if (err)
 511                 return err;
 512
 513         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 514                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 515                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 516         if (IS_ERR(handle))
 517                 return PTR_ERR(handle);
 518
 519         err = ext4_reserve_inode_write(handle, inode, &iloc);
 520         if (err)
 521                 goto out_stop;
 522
 523         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 524         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 525
 526                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 527                  * counts xattr inode references.
 528                  */
 529                 down_read(&EXT4_I(inode)->xattr_sem);
 530                 err = __dquot_transfer(inode, transfer_to);
 531                 up_read(&EXT4_I(inode)->xattr_sem);
 532                 dqput(transfer_to[PRJQUOTA]);
 533                 if (err)
 534                         goto out_dirty;
 535         }
 536
 537         EXT4_I(inode)->i_projid = kprojid;
 538         inode->i_ctime = current_time(inode);
 539 out_dirty:
 540         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 541         if (!err)
 542                 err = rc;
 543 out_stop:
 544         ext4_journal_stop(handle);
 545         return err;
 546 }
 547 #else
 548 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 549 {
 550         if (projid != EXT4_DEF_PROJID)
 551                 return -EOPNOTSUPP;
 552         return 0;
 553 }
 554 #endif
 555
 556 /* Transfer internal flags to xflags */
 557 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 558 {
 559         __u32 xflags = 0;
 560
 561         if (iflags & EXT4_SYNC_FL)
 562                 xflags |= FS_XFLAG_SYNC;
 563         if (iflags & EXT4_IMMUTABLE_FL)
 564                 xflags |= FS_XFLAG_IMMUTABLE;
 565         if (iflags & EXT4_APPEND_FL)
 566                 xflags |= FS_XFLAG_APPEND;
 567         if (iflags & EXT4_NODUMP_FL)
 568                 xflags |= FS_XFLAG_NODUMP;
 569         if (iflags & EXT4_NOATIME_FL)
 570                 xflags |= FS_XFLAG_NOATIME;
 571         if (iflags & EXT4_PROJINHERIT_FL)
 572                 xflags |= FS_XFLAG_PROJINHERIT;
 573         if (iflags & EXT4_DAX_FL)
 574                 xflags |= FS_XFLAG_DAX;
 575         return xflags;
 576 }
 577
 578 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 579                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 580                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT | \
 581                                   FS_XFLAG_DAX)
 582
 583 /* Transfer xflags flags to internal */
 584 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 585 {
 586         unsigned long iflags = 0;
 587
 588         if (xflags & FS_XFLAG_SYNC)
 589                 iflags |= EXT4_SYNC_FL;
 590         if (xflags & FS_XFLAG_IMMUTABLE)
 591                 iflags |= EXT4_IMMUTABLE_FL;
 592         if (xflags & FS_XFLAG_APPEND)
 593                 iflags |= EXT4_APPEND_FL;
 594         if (xflags & FS_XFLAG_NODUMP)
 595                 iflags |= EXT4_NODUMP_FL;
 596         if (xflags & FS_XFLAG_NOATIME)
 597                 iflags |= EXT4_NOATIME_FL;
 598         if (xflags & FS_XFLAG_PROJINHERIT)
 599                 iflags |= EXT4_PROJINHERIT_FL;
 600         if (xflags & FS_XFLAG_DAX)
 601                 iflags |= EXT4_DAX_FL;
 602
 603         return iflags;
 604 }
 605
 606 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 607 {
 608         struct ext4_sb_info *sbi = EXT4_SB(sb);
 609         __u32 flags;
 610
 611         if (!capable(CAP_SYS_ADMIN))
 612                 return -EPERM;
 613
 614         if (get_user(flags, (__u32 __user *)arg))
 615                 return -EFAULT;
 616
 617         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 618                 return -EINVAL;
 619
 620         if (ext4_forced_shutdown(sbi))
 621                 return 0;
 622
 623         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 624         trace_ext4_shutdown(sb, flags);
 625
 626         switch (flags) {
 627         case EXT4_GOING_FLAGS_DEFAULT:
 628                 freeze_bdev(sb->s_bdev);
 629                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 630                 thaw_bdev(sb->s_bdev);
 631                 break;
 632         case EXT4_GOING_FLAGS_LOGFLUSH:
 633                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 634                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 635                         (void) ext4_force_commit(sb);
 636                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 637                 }
 638                 break;
 639         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 640                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 641                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 642                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 643                 break;
 644         default:
 645                 return -EINVAL;
 646         }
 647         clear_opt(sb, DISCARD);
 648         return 0;
 649 }
 650
 651 struct getfsmap_info {
 652         struct super_block      *gi_sb;
 653         struct fsmap_head __user *gi_data;
 654         unsigned int            gi_idx;
 655         __u32                   gi_last_flags;
 656 };
 657
 658 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 659 {
 660         struct getfsmap_info *info = priv;
 661         struct fsmap fm;
 662
 663         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 664
 665         info->gi_last_flags = xfm->fmr_flags;
 666         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 667         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 668                         sizeof(struct fsmap)))
 669                 return -EFAULT;
 670
 671         return 0;
 672 }
 673
 674 static int ext4_ioc_getfsmap(struct super_block *sb,
 675                              struct fsmap_head __user *arg)
 676 {
 677         struct getfsmap_info info = { NULL };
 678         struct ext4_fsmap_head xhead = {0};
 679         struct fsmap_head head;
 680         bool aborted = false;
 681         int error;
 682
 683         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 684                 return -EFAULT;
 685         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 686             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 687                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 688             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 689                        sizeof(head.fmh_keys[1].fmr_reserved)))
 690                 return -EINVAL;
 691         /*
 692          * ext4 doesn't report file extents at all, so the only valid
 693          * file offsets are the magic ones (all zeroes or all ones).
 694          */
 695         if (head.fmh_keys[0].fmr_offset ||
 696             (head.fmh_keys[1].fmr_offset != 0 &&
 697              head.fmh_keys[1].fmr_offset != -1ULL))
 698                 return -EINVAL;
 699
 700         xhead.fmh_iflags = head.fmh_iflags;
 701         xhead.fmh_count = head.fmh_count;
 702         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 703         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 704
 705         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 706         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 707
 708         info.gi_sb = sb;
 709         info.gi_data = arg;
 710         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 711         if (error == EXT4_QUERY_RANGE_ABORT) {
 712                 error = 0;
 713                 aborted = true;
 714         } else if (error)
 715                 return error;
 716
 717         /* If we didn't abort, set the "last" flag in the last fmx */
 718         if (!aborted && info.gi_idx) {
 719                 info.gi_last_flags |= FMR_OF_LAST;
 720                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 721                                  &info.gi_last_flags,
 722                                  sizeof(info.gi_last_flags)))
 723                         return -EFAULT;
 724         }
 725
 726         /* copy back header */
 727         head.fmh_entries = xhead.fmh_entries;
 728         head.fmh_oflags = xhead.fmh_oflags;
 729         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 730                 return -EFAULT;
 731
 732         return 0;
 733 }
 734
 735 static long ext4_ioctl_group_add(struct file *file,
 736                                  struct ext4_new_group_data *input)
 737 {
 738         struct super_block *sb = file_inode(file)->i_sb;
 739         int err, err2=0;
 740
 741         err = ext4_resize_begin(sb);
 742         if (err)
 743                 return err;
 744
 745         if (ext4_has_feature_bigalloc(sb)) {
 746                 ext4_msg(sb, KERN_ERR,
 747                          "Online resizing not supported with bigalloc");
 748                 err = -EOPNOTSUPP;
 749                 goto group_add_out;
 750         }
 751
 752         err = mnt_want_write_file(file);
 753         if (err)
 754                 goto group_add_out;
 755
 756         err = ext4_group_add(sb, input);
 757         if (EXT4_SB(sb)->s_journal) {
 758                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 759                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 760                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 761         }
 762         if (err == 0)
 763                 err = err2;
 764         mnt_drop_write_file(file);
 765         if (!err && ext4_has_group_desc_csum(sb) &&
 766             test_opt(sb, INIT_INODE_TABLE))
 767                 err = ext4_register_li_request(sb, input->group);
 768 group_add_out:
 769         ext4_resize_end(sb);
 770         return err;
 771 }
 772
 773 static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
 774 {
 775         struct ext4_inode_info *ei = EXT4_I(inode);
 776
 777         simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
 778                                                       EXT4_FL_USER_VISIBLE));
 779
 780         if (ext4_has_feature_project(inode->i_sb))
 781                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 782 }
 783
 784 /* So that the fiemap access checks can't overflow on 32 bit machines. */
 785 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
 786
 787 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
 788 {
 789         struct fiemap fiemap;
 790         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 791         struct fiemap_extent_info fieinfo = { 0, };
 792         struct inode *inode = file_inode(filp);
 793         int error;
 794
 795         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 796                 return -EFAULT;
 797
 798         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 799                 return -EINVAL;
 800
 801         fieinfo.fi_flags = fiemap.fm_flags;
 802         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 803         fieinfo.fi_extents_start = ufiemap->fm_extents;
 804
 805         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
 806                         fiemap.fm_length);
 807         fiemap.fm_flags = fieinfo.fi_flags;
 808         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 809         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 810                 error = -EFAULT;
 811
 812         return error;
 813 }
 814
 815 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 816 {
 817         struct inode *inode = file_inode(filp);
 818         struct super_block *sb = inode->i_sb;
 819         struct ext4_inode_info *ei = EXT4_I(inode);
 820         struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
 821         unsigned int flags;
 822
 823         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 824
 825         switch (cmd) {
 826         case FS_IOC_GETFSMAP:
 827                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 828         case FS_IOC_GETFLAGS:
 829                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 830                 if (S_ISREG(inode->i_mode))
 831                         flags &= ~EXT4_PROJINHERIT_FL;
 832                 return put_user(flags, (int __user *) arg);
 833         case FS_IOC_SETFLAGS: {
 834                 int err;
 835
 836                 if (!inode_owner_or_capable(mnt_userns, inode))
 837                         return -EACCES;
 838
 839                 if (get_user(flags, (int __user *) arg))
 840                         return -EFAULT;
 841
 842                 if (flags & ~EXT4_FL_USER_VISIBLE)
 843                         return -EOPNOTSUPP;
 844                 /*
 845                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 846                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 847                  * more restrictive than just silently masking off visible but
 848                  * not settable flags as we always did.
 849                  */
 850                 flags &= EXT4_FL_USER_MODIFIABLE;
 851                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 852                         return -EOPNOTSUPP;
 853
 854                 err = mnt_want_write_file(filp);
 855                 if (err)
 856                         return err;
 857
 858                 inode_lock(inode);
 859                 err = ext4_ioctl_check_immutable(inode,
 860                                 from_kprojid(&init_user_ns, ei->i_projid),
 861                                 flags);
 862                 if (!err)
 863                         err = ext4_ioctl_setflags(inode, flags);
 864                 inode_unlock(inode);
 865                 mnt_drop_write_file(filp);
 866                 return err;
 867         }
 868         case EXT4_IOC_GETVERSION:
 869         case EXT4_IOC_GETVERSION_OLD:
 870                 return put_user(inode->i_generation, (int __user *) arg);
 871         case EXT4_IOC_SETVERSION:
 872         case EXT4_IOC_SETVERSION_OLD: {
 873                 handle_t *handle;
 874                 struct ext4_iloc iloc;
 875                 __u32 generation;
 876                 int err;
 877
 878                 if (!inode_owner_or_capable(mnt_userns, inode))
 879                         return -EPERM;
 880
 881                 if (ext4_has_metadata_csum(inode->i_sb)) {
 882                         ext4_warning(sb, "Setting inode version is not "
 883                                      "supported with metadata_csum enabled.");
 884                         return -ENOTTY;
 885                 }
 886
 887                 err = mnt_want_write_file(filp);
 888                 if (err)
 889                         return err;
 890                 if (get_user(generation, (int __user *) arg)) {
 891                         err = -EFAULT;
 892                         goto setversion_out;
 893                 }
 894
 895                 inode_lock(inode);
 896                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 897                 if (IS_ERR(handle)) {
 898                         err = PTR_ERR(handle);
 899                         goto unlock_out;
 900                 }
 901                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 902                 if (err == 0) {
 903                         inode->i_ctime = current_time(inode);
 904                         inode->i_generation = generation;
 905                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 906                 }
 907                 ext4_journal_stop(handle);
 908
 909 unlock_out:
 910                 inode_unlock(inode);
 911 setversion_out:
 912                 mnt_drop_write_file(filp);
 913                 return err;
 914         }
 915         case EXT4_IOC_GROUP_EXTEND: {
 916                 ext4_fsblk_t n_blocks_count;
 917                 int err, err2=0;
 918
 919                 err = ext4_resize_begin(sb);
 920                 if (err)
 921                         return err;
 922
 923                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 924                         err = -EFAULT;
 925                         goto group_extend_out;
 926                 }
 927
 928                 if (ext4_has_feature_bigalloc(sb)) {
 929                         ext4_msg(sb, KERN_ERR,
 930                                  "Online resizing not supported with bigalloc");
 931                         err = -EOPNOTSUPP;
 932                         goto group_extend_out;
 933                 }
 934
 935                 err = mnt_want_write_file(filp);
 936                 if (err)
 937                         goto group_extend_out;
 938
 939                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 940                 if (EXT4_SB(sb)->s_journal) {
 941                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 942                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 943                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 944                 }
 945                 if (err == 0)
 946                         err = err2;
 947                 mnt_drop_write_file(filp);
 948 group_extend_out:
 949                 ext4_resize_end(sb);
 950                 return err;
 951         }
 952
 953         case EXT4_IOC_MOVE_EXT: {
 954                 struct move_extent me;
 955                 struct fd donor;
 956                 int err;
 957
 958                 if (!(filp->f_mode & FMODE_READ) ||
 959                     !(filp->f_mode & FMODE_WRITE))
 960                         return -EBADF;
 961
 962                 if (copy_from_user(&me,
 963                         (struct move_extent __user *)arg, sizeof(me)))
 964                         return -EFAULT;
 965                 me.moved_len = 0;
 966
 967                 donor = fdget(me.donor_fd);
 968                 if (!donor.file)
 969                         return -EBADF;
 970
 971                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 972                         err = -EBADF;
 973                         goto mext_out;
 974                 }
 975
 976                 if (ext4_has_feature_bigalloc(sb)) {
 977                         ext4_msg(sb, KERN_ERR,
 978                                  "Online defrag not supported with bigalloc");
 979                         err = -EOPNOTSUPP;
 980                         goto mext_out;
 981                 } else if (IS_DAX(inode)) {
 982                         ext4_msg(sb, KERN_ERR,
 983                                  "Online defrag not supported with DAX");
 984                         err = -EOPNOTSUPP;
 985                         goto mext_out;
 986                 }
 987
 988                 err = mnt_want_write_file(filp);
 989                 if (err)
 990                         goto mext_out;
 991
 992                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 993                                         me.donor_start, me.len, &me.moved_len);
 994                 mnt_drop_write_file(filp);
 995
 996                 if (copy_to_user((struct move_extent __user *)arg,
 997                                  &me, sizeof(me)))
 998                         err = -EFAULT;
 999 mext_out:
1000                 fdput(donor);
1001                 return err;
1002         }
1003
1004         case EXT4_IOC_GROUP_ADD: {
1005                 struct ext4_new_group_data input;
1006
1007                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1008                                 sizeof(input)))
1009                         return -EFAULT;
1010
1011                 return ext4_ioctl_group_add(filp, &input);
1012         }
1013
1014         case EXT4_IOC_MIGRATE:
1015         {
1016                 int err;
1017                 if (!inode_owner_or_capable(mnt_userns, inode))
1018                         return -EACCES;
1019
1020                 err = mnt_want_write_file(filp);
1021                 if (err)
1022                         return err;
1023                 /*
1024                  * inode_mutex prevent write and truncate on the file.
1025                  * Read still goes through. We take i_data_sem in
1026                  * ext4_ext_swap_inode_data before we switch the
1027                  * inode format to prevent read.
1028                  */
1029                 inode_lock((inode));
1030                 err = ext4_ext_migrate(inode);
1031                 inode_unlock((inode));
1032                 mnt_drop_write_file(filp);
1033                 return err;
1034         }
1035
1036         case EXT4_IOC_ALLOC_DA_BLKS:
1037         {
1038                 int err;
1039                 if (!inode_owner_or_capable(mnt_userns, inode))
1040                         return -EACCES;
1041
1042                 err = mnt_want_write_file(filp);
1043                 if (err)
1044                         return err;
1045                 err = ext4_alloc_da_blocks(inode);
1046                 mnt_drop_write_file(filp);
1047                 return err;
1048         }
1049
1050         case EXT4_IOC_SWAP_BOOT:
1051         {
1052                 int err;
1053                 if (!(filp->f_mode & FMODE_WRITE))
1054                         return -EBADF;
1055                 err = mnt_want_write_file(filp);
1056                 if (err)
1057                         return err;
1058                 err = swap_inode_boot_loader(sb, mnt_userns, inode);
1059                 mnt_drop_write_file(filp);
1060                 return err;
1061         }
1062
1063         case EXT4_IOC_RESIZE_FS: {
1064                 ext4_fsblk_t n_blocks_count;
1065                 int err = 0, err2 = 0;
1066                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1067
1068                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1069                                    sizeof(__u64))) {
1070                         return -EFAULT;
1071                 }
1072
1073                 err = ext4_resize_begin(sb);
1074                 if (err)
1075                         return err;
1076
1077                 err = mnt_want_write_file(filp);
1078                 if (err)
1079                         goto resizefs_out;
1080
1081                 err = ext4_resize_fs(sb, n_blocks_count);
1082                 if (EXT4_SB(sb)->s_journal) {
1083                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE);
1084                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1085                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1086                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1087                 }
1088                 if (err == 0)
1089                         err = err2;
1090                 mnt_drop_write_file(filp);
1091                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1092                     ext4_has_group_desc_csum(sb) &&
1093                     test_opt(sb, INIT_INODE_TABLE))
1094                         err = ext4_register_li_request(sb, o_group);
1095
1096 resizefs_out:
1097                 ext4_resize_end(sb);
1098                 return err;
1099         }
1100
1101         case FITRIM:
1102         {
1103                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1104                 struct fstrim_range range;
1105                 int ret = 0;
1106
1107                 if (!capable(CAP_SYS_ADMIN))
1108                         return -EPERM;
1109
1110                 if (!blk_queue_discard(q))
1111                         return -EOPNOTSUPP;
1112
1113                 /*
1114                  * We haven't replayed the journal, so we cannot use our
1115                  * block-bitmap-guided storage zapping commands.
1116                  */
1117                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1118                         return -EROFS;
1119
1120                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1121                     sizeof(range)))
1122                         return -EFAULT;
1123
1124                 range.minlen = max((unsigned int)range.minlen,
1125                                    q->limits.discard_granularity);
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(mnt_userns, 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(mnt_userns, 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         case FS_IOC_READ_VERITY_METADATA:
1317                 if (!ext4_has_feature_verity(sb))
1318                         return -EOPNOTSUPP;
1319                 return fsverity_ioctl_read_metadata(filp,
1320                                                     (const void __user *)arg);
1321
1322         default:
1323                 return -ENOTTY;
1324         }
1325 }
1326
1327 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1328 {
1329         long ret;
1330
1331         ext4_fc_start_update(file_inode(filp));
1332         ret = __ext4_ioctl(filp, cmd, arg);
1333         ext4_fc_stop_update(file_inode(filp));
1334
1335         return ret;
1336 }
1337
1338 #ifdef CONFIG_COMPAT
1339 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1340 {
1341         /* These are just misnamed, they actually get/put from/to user an int */
1342         switch (cmd) {
1343         case FS_IOC32_GETFLAGS:
1344                 cmd = FS_IOC_GETFLAGS;
1345                 break;
1346         case FS_IOC32_SETFLAGS:
1347                 cmd = FS_IOC_SETFLAGS;
1348                 break;
1349         case EXT4_IOC32_GETVERSION:
1350                 cmd = EXT4_IOC_GETVERSION;
1351                 break;
1352         case EXT4_IOC32_SETVERSION:
1353                 cmd = EXT4_IOC_SETVERSION;
1354                 break;
1355         case EXT4_IOC32_GROUP_EXTEND:
1356                 cmd = EXT4_IOC_GROUP_EXTEND;
1357                 break;
1358         case EXT4_IOC32_GETVERSION_OLD:
1359                 cmd = EXT4_IOC_GETVERSION_OLD;
1360                 break;
1361         case EXT4_IOC32_SETVERSION_OLD:
1362                 cmd = EXT4_IOC_SETVERSION_OLD;
1363                 break;
1364         case EXT4_IOC32_GETRSVSZ:
1365                 cmd = EXT4_IOC_GETRSVSZ;
1366                 break;
1367         case EXT4_IOC32_SETRSVSZ:
1368                 cmd = EXT4_IOC_SETRSVSZ;
1369                 break;
1370         case EXT4_IOC32_GROUP_ADD: {
1371                 struct compat_ext4_new_group_input __user *uinput;
1372                 struct ext4_new_group_data input;
1373                 int err;
1374
1375                 uinput = compat_ptr(arg);
1376                 err = get_user(input.group, &uinput->group);
1377                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1378                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1379                 err |= get_user(input.inode_table, &uinput->inode_table);
1380                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1381                 err |= get_user(input.reserved_blocks,
1382                                 &uinput->reserved_blocks);
1383                 if (err)
1384                         return -EFAULT;
1385                 return ext4_ioctl_group_add(file, &input);
1386         }
1387         case EXT4_IOC_MOVE_EXT:
1388         case EXT4_IOC_RESIZE_FS:
1389         case FITRIM:
1390         case EXT4_IOC_PRECACHE_EXTENTS:
1391         case FS_IOC_SET_ENCRYPTION_POLICY:
1392         case FS_IOC_GET_ENCRYPTION_PWSALT:
1393         case FS_IOC_GET_ENCRYPTION_POLICY:
1394         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1395         case FS_IOC_ADD_ENCRYPTION_KEY:
1396         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1397         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1398         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1399         case FS_IOC_GET_ENCRYPTION_NONCE:
1400         case EXT4_IOC_SHUTDOWN:
1401         case FS_IOC_GETFSMAP:
1402         case FS_IOC_ENABLE_VERITY:
1403         case FS_IOC_MEASURE_VERITY:
1404         case FS_IOC_READ_VERITY_METADATA:
1405         case EXT4_IOC_CLEAR_ES_CACHE:
1406         case EXT4_IOC_GETSTATE:
1407         case EXT4_IOC_GET_ES_CACHE:
1408         case FS_IOC_FSGETXATTR:
1409         case FS_IOC_FSSETXATTR:
1410                 break;
1411         default:
1412                 return -ENOIOCTLCMD;
1413         }
1414         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1415 }
1416 #endif