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/uaccess.h>
  20 #include <linux/delay.h>
  21 #include <linux/iversion.h>
  22 #include <linux/fileattr.h>
  23 #include <linux/uuid.h>
  24 #include "ext4_jbd2.h"
  25 #include "ext4.h"
  26 #include <linux/fsmap.h>
  27 #include "fsmap.h"
  28 #include <trace/events/ext4.h>
  29
  30 typedef void ext4_update_sb_callback(struct ext4_super_block *es,
  31                                        const void *arg);
  32
  33 /*
  34  * Superblock modification callback function for changing file system
  35  * label
  36  */
  37 static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
  38 {
  39         /* Sanity check, this should never happen */
  40         BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
  41
  42         memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);
  43 }
  44
  45 /*
  46  * Superblock modification callback function for changing file system
  47  * UUID.
  48  */
  49 static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
  50 {
  51         memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
  52 }
  53
  54 static
  55 int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
  56                            ext4_update_sb_callback func,
  57                            const void *arg)
  58 {
  59         int err = 0;
  60         struct ext4_sb_info *sbi = EXT4_SB(sb);
  61         struct buffer_head *bh = sbi->s_sbh;
  62         struct ext4_super_block *es = sbi->s_es;
  63
  64         trace_ext4_update_sb(sb, bh->b_blocknr, 1);
  65
  66         BUFFER_TRACE(bh, "get_write_access");
  67         err = ext4_journal_get_write_access(handle, sb,
  68                                             bh,
  69                                             EXT4_JTR_NONE);
  70         if (err)
  71                 goto out_err;
  72
  73         lock_buffer(bh);
  74         func(es, arg);
  75         ext4_superblock_csum_set(sb);
  76         unlock_buffer(bh);
  77
  78         if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
  79                 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
  80                          "superblock detected");
  81                 clear_buffer_write_io_error(bh);
  82                 set_buffer_uptodate(bh);
  83         }
  84
  85         err = ext4_handle_dirty_metadata(handle, NULL, bh);
  86         if (err)
  87                 goto out_err;
  88         err = sync_dirty_buffer(bh);
  89 out_err:
  90         ext4_std_error(sb, err);
  91         return err;
  92 }
  93
  94 /*
  95  * Update one backup superblock in the group 'grp' using the callback
  96  * function 'func' and argument 'arg'. If the handle is NULL the
  97  * modification is not journalled.
  98  *
  99  * Returns: 0 when no modification was done (no superblock in the group)
 100  *          1 when the modification was successful
 101  *         <0 on error
 102  */
 103 static int ext4_update_backup_sb(struct super_block *sb,
 104                                  handle_t *handle, ext4_group_t grp,
 105                                  ext4_update_sb_callback func, const void *arg)
 106 {
 107         int err = 0;
 108         ext4_fsblk_t sb_block;
 109         struct buffer_head *bh;
 110         unsigned long offset = 0;
 111         struct ext4_super_block *es;
 112
 113         if (!ext4_bg_has_super(sb, grp))
 114                 return 0;
 115
 116         /*
 117          * For the group 0 there is always 1k padding, so we have
 118          * either adjust offset, or sb_block depending on blocksize
 119          */
 120         if (grp == 0) {
 121                 sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
 122                 offset = do_div(sb_block, sb->s_blocksize);
 123         } else {
 124                 sb_block = ext4_group_first_block_no(sb, grp);
 125                 offset = 0;
 126         }
 127
 128         trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
 129
 130         bh = ext4_sb_bread(sb, sb_block, 0);
 131         if (IS_ERR(bh))
 132                 return PTR_ERR(bh);
 133
 134         if (handle) {
 135                 BUFFER_TRACE(bh, "get_write_access");
 136                 err = ext4_journal_get_write_access(handle, sb,
 137                                                     bh,
 138                                                     EXT4_JTR_NONE);
 139                 if (err)
 140                         goto out_bh;
 141         }
 142
 143         es = (struct ext4_super_block *) (bh->b_data + offset);
 144         lock_buffer(bh);
 145         if (ext4_has_metadata_csum(sb) &&
 146             es->s_checksum != ext4_superblock_csum(sb, es)) {
 147                 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
 148                 "superblock %llu", sb_block);
 149                 unlock_buffer(bh);
 150                 goto out_bh;
 151         }
 152         func(es, arg);
 153         if (ext4_has_metadata_csum(sb))
 154                 es->s_checksum = ext4_superblock_csum(sb, es);
 155         set_buffer_uptodate(bh);
 156         unlock_buffer(bh);
 157
 158         if (handle) {
 159                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
 160                 if (err)
 161                         goto out_bh;
 162         } else {
 163                 BUFFER_TRACE(bh, "marking dirty");
 164                 mark_buffer_dirty(bh);
 165         }
 166         err = sync_dirty_buffer(bh);
 167
 168 out_bh:
 169         brelse(bh);
 170         ext4_std_error(sb, err);
 171         return (err) ? err : 1;
 172 }
 173
 174 /*
 175  * Update primary and backup superblocks using the provided function
 176  * func and argument arg.
 177  *
 178  * Only the primary superblock and at most two backup superblock
 179  * modifications are journalled; the rest is modified without journal.
 180  * This is safe because e2fsck will re-write them if there is a problem,
 181  * and we're very unlikely to ever need more than two backups.
 182  */
 183 static
 184 int ext4_update_superblocks_fn(struct super_block *sb,
 185                                ext4_update_sb_callback func,
 186                                const void *arg)
 187 {
 188         handle_t *handle;
 189         ext4_group_t ngroups;
 190         unsigned int three = 1;
 191         unsigned int five = 5;
 192         unsigned int seven = 7;
 193         int err = 0, ret, i;
 194         ext4_group_t grp, primary_grp;
 195         struct ext4_sb_info *sbi = EXT4_SB(sb);
 196
 197         /*
 198          * We can't update superblocks while the online resize is running
 199          */
 200         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 201                                   &sbi->s_ext4_flags)) {
 202                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
 203                          "performing online resize");
 204                 return -EBUSY;
 205         }
 206
 207         /*
 208          * We're only going to update primary superblock and two
 209          * backup superblocks in this transaction.
 210          */
 211         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
 212         if (IS_ERR(handle)) {
 213                 err = PTR_ERR(handle);
 214                 goto out;
 215         }
 216
 217         /* Update primary superblock */
 218         err = ext4_update_primary_sb(sb, handle, func, arg);
 219         if (err) {
 220                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
 221                          "superblock");
 222                 goto out_journal;
 223         }
 224
 225         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
 226         ngroups = ext4_get_groups_count(sb);
 227
 228         /*
 229          * Update backup superblocks. We have to start from group 0
 230          * because it might not be where the primary superblock is
 231          * if the fs is mounted with -o sb=<backup_sb_block>
 232          */
 233         i = 0;
 234         grp = 0;
 235         while (grp < ngroups) {
 236                 /* Skip primary superblock */
 237                 if (grp == primary_grp)
 238                         goto next_grp;
 239
 240                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
 241                 if (ret < 0) {
 242                         /* Ignore bad checksum; try to update next sb */
 243                         if (ret == -EFSBADCRC)
 244                                 goto next_grp;
 245                         err = ret;
 246                         goto out_journal;
 247                 }
 248
 249                 i += ret;
 250                 if (handle && i > 1) {
 251                         /*
 252                          * We're only journalling primary superblock and
 253                          * two backup superblocks; the rest is not
 254                          * journalled.
 255                          */
 256                         err = ext4_journal_stop(handle);
 257                         if (err)
 258                                 goto out;
 259                         handle = NULL;
 260                 }
 261 next_grp:
 262                 grp = ext4_list_backups(sb, &three, &five, &seven);
 263         }
 264
 265 out_journal:
 266         if (handle) {
 267                 ret = ext4_journal_stop(handle);
 268                 if (ret && !err)
 269                         err = ret;
 270         }
 271 out:
 272         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
 273         smp_mb__after_atomic();
 274         return err ? err : 0;
 275 }
 276
 277 /*
 278  * Swap memory between @a and @b for @len bytes.
 279  *
 280  * @a:          pointer to first memory area
 281  * @b:          pointer to second memory area
 282  * @len:        number of bytes to swap
 283  *
 284  */
 285 static void memswap(void *a, void *b, size_t len)
 286 {
 287         unsigned char *ap, *bp;
 288
 289         ap = (unsigned char *)a;
 290         bp = (unsigned char *)b;
 291         while (len-- > 0) {
 292                 swap(*ap, *bp);
 293                 ap++;
 294                 bp++;
 295         }
 296 }
 297
 298 /*
 299  * Swap i_data and associated attributes between @inode1 and @inode2.
 300  * This function is used for the primary swap between inode1 and inode2
 301  * and also to revert this primary swap in case of errors.
 302  *
 303  * Therefore you have to make sure, that calling this method twice
 304  * will revert all changes.
 305  *
 306  * @inode1:     pointer to first inode
 307  * @inode2:     pointer to second inode
 308  */
 309 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 310 {
 311         loff_t isize;
 312         struct ext4_inode_info *ei1;
 313         struct ext4_inode_info *ei2;
 314         unsigned long tmp;
 315
 316         ei1 = EXT4_I(inode1);
 317         ei2 = EXT4_I(inode2);
 318
 319         swap(inode1->i_version, inode2->i_version);
 320         swap(inode1->i_atime, inode2->i_atime);
 321         swap(inode1->i_mtime, inode2->i_mtime);
 322
 323         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 324         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 325         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 326                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 327         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 328         swap(ei1->i_disksize, ei2->i_disksize);
 329         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 330         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 331
 332         isize = i_size_read(inode1);
 333         i_size_write(inode1, i_size_read(inode2));
 334         i_size_write(inode2, isize);
 335 }
 336
 337 void ext4_reset_inode_seed(struct inode *inode)
 338 {
 339         struct ext4_inode_info *ei = EXT4_I(inode);
 340         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 341         __le32 inum = cpu_to_le32(inode->i_ino);
 342         __le32 gen = cpu_to_le32(inode->i_generation);
 343         __u32 csum;
 344
 345         if (!ext4_has_metadata_csum(inode->i_sb))
 346                 return;
 347
 348         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 349         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 350 }
 351
 352 /*
 353  * Swap the information from the given @inode and the inode
 354  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 355  * important fields of the inodes.
 356  *
 357  * @sb:         the super block of the filesystem
 358  * @idmap:      idmap of the mount the inode was found from
 359  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 360  *
 361  */
 362 static long swap_inode_boot_loader(struct super_block *sb,
 363                                 struct mnt_idmap *idmap,
 364                                 struct inode *inode)
 365 {
 366         handle_t *handle;
 367         int err;
 368         struct inode *inode_bl;
 369         struct ext4_inode_info *ei_bl;
 370         qsize_t size, size_bl, diff;
 371         blkcnt_t blocks;
 372         unsigned short bytes;
 373
 374         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO,
 375                         EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
 376         if (IS_ERR(inode_bl))
 377                 return PTR_ERR(inode_bl);
 378         ei_bl = EXT4_I(inode_bl);
 379
 380         /* Protect orig inodes against a truncate and make sure,
 381          * that only 1 swap_inode_boot_loader is running. */
 382         lock_two_nondirectories(inode, inode_bl);
 383
 384         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 385             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 386             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 387             ext4_has_inline_data(inode)) {
 388                 err = -EINVAL;
 389                 goto journal_err_out;
 390         }
 391
 392         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 393             !inode_owner_or_capable(idmap, inode) ||
 394             !capable(CAP_SYS_ADMIN)) {
 395                 err = -EPERM;
 396                 goto journal_err_out;
 397         }
 398
 399         filemap_invalidate_lock(inode->i_mapping);
 400         err = filemap_write_and_wait(inode->i_mapping);
 401         if (err)
 402                 goto err_out;
 403
 404         err = filemap_write_and_wait(inode_bl->i_mapping);
 405         if (err)
 406                 goto err_out;
 407
 408         /* Wait for all existing dio workers */
 409         inode_dio_wait(inode);
 410         inode_dio_wait(inode_bl);
 411
 412         truncate_inode_pages(&inode->i_data, 0);
 413         truncate_inode_pages(&inode_bl->i_data, 0);
 414
 415         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 416         if (IS_ERR(handle)) {
 417                 err = -EINVAL;
 418                 goto err_out;
 419         }
 420         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
 421
 422         /* Protect extent tree against block allocations via delalloc */
 423         ext4_double_down_write_data_sem(inode, inode_bl);
 424
 425         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
 426                 /* this inode has never been used as a BOOT_LOADER */
 427                 set_nlink(inode_bl, 1);
 428                 i_uid_write(inode_bl, 0);
 429                 i_gid_write(inode_bl, 0);
 430                 inode_bl->i_flags = 0;
 431                 ei_bl->i_flags = 0;
 432                 inode_set_iversion(inode_bl, 1);
 433                 i_size_write(inode_bl, 0);
 434                 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size;
 435                 inode_bl->i_mode = S_IFREG;
 436                 if (ext4_has_feature_extents(sb)) {
 437                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 438                         ext4_ext_tree_init(handle, inode_bl);
 439                 } else
 440                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 441         }
 442
 443         err = dquot_initialize(inode);
 444         if (err)
 445                 goto err_out1;
 446
 447         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 448         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 449         diff = size - size_bl;
 450         swap_inode_data(inode, inode_bl);
 451
 452         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 453         inode_inc_iversion(inode);
 454
 455         inode->i_generation = get_random_u32();
 456         inode_bl->i_generation = get_random_u32();
 457         ext4_reset_inode_seed(inode);
 458         ext4_reset_inode_seed(inode_bl);
 459
 460         ext4_discard_preallocations(inode, 0);
 461
 462         err = ext4_mark_inode_dirty(handle, inode);
 463         if (err < 0) {
 464                 /* No need to update quota information. */
 465                 ext4_warning(inode->i_sb,
 466                         "couldn't mark inode #%lu dirty (err %d)",
 467                         inode->i_ino, err);
 468                 /* Revert all changes: */
 469                 swap_inode_data(inode, inode_bl);
 470                 ext4_mark_inode_dirty(handle, inode);
 471                 goto err_out1;
 472         }
 473
 474         blocks = inode_bl->i_blocks;
 475         bytes = inode_bl->i_bytes;
 476         inode_bl->i_blocks = inode->i_blocks;
 477         inode_bl->i_bytes = inode->i_bytes;
 478         err = ext4_mark_inode_dirty(handle, inode_bl);
 479         if (err < 0) {
 480                 /* No need to update quota information. */
 481                 ext4_warning(inode_bl->i_sb,
 482                         "couldn't mark inode #%lu dirty (err %d)",
 483                         inode_bl->i_ino, err);
 484                 goto revert;
 485         }
 486
 487         /* Bootloader inode should not be counted into quota information. */
 488         if (diff > 0)
 489                 dquot_free_space(inode, diff);
 490         else
 491                 err = dquot_alloc_space(inode, -1 * diff);
 492
 493         if (err < 0) {
 494 revert:
 495                 /* Revert all changes: */
 496                 inode_bl->i_blocks = blocks;
 497                 inode_bl->i_bytes = bytes;
 498                 swap_inode_data(inode, inode_bl);
 499                 ext4_mark_inode_dirty(handle, inode);
 500                 ext4_mark_inode_dirty(handle, inode_bl);
 501         }
 502
 503 err_out1:
 504         ext4_journal_stop(handle);
 505         ext4_double_up_write_data_sem(inode, inode_bl);
 506
 507 err_out:
 508         filemap_invalidate_unlock(inode->i_mapping);
 509 journal_err_out:
 510         unlock_two_nondirectories(inode, inode_bl);
 511         iput(inode_bl);
 512         return err;
 513 }
 514
 515 /*
 516  * If immutable is set and we are not clearing it, we're not allowed to change
 517  * anything else in the inode.  Don't error out if we're only trying to set
 518  * immutable on an immutable file.
 519  */
 520 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 521                                       unsigned int flags)
 522 {
 523         struct ext4_inode_info *ei = EXT4_I(inode);
 524         unsigned int oldflags = ei->i_flags;
 525
 526         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 527                 return 0;
 528
 529         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 530                 return -EPERM;
 531         if (ext4_has_feature_project(inode->i_sb) &&
 532             __kprojid_val(ei->i_projid) != new_projid)
 533                 return -EPERM;
 534
 535         return 0;
 536 }
 537
 538 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 539 {
 540         struct ext4_inode_info *ei = EXT4_I(inode);
 541
 542         if (S_ISDIR(inode->i_mode))
 543                 return;
 544
 545         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 546             test_opt(inode->i_sb, DAX_ALWAYS))
 547                 return;
 548
 549         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 550                 d_mark_dontcache(inode);
 551 }
 552
 553 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 554                            unsigned int flags)
 555 {
 556         /* Allow the DAX flag to be changed on inline directories */
 557         if (S_ISDIR(inode->i_mode)) {
 558                 flags &= ~EXT4_INLINE_DATA_FL;
 559                 oldflags &= ~EXT4_INLINE_DATA_FL;
 560         }
 561
 562         if (flags & EXT4_DAX_FL) {
 563                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 564                      ext4_test_inode_state(inode,
 565                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 566                         return false;
 567                 }
 568         }
 569
 570         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 571                         return false;
 572
 573         return true;
 574 }
 575
 576 static int ext4_ioctl_setflags(struct inode *inode,
 577                                unsigned int flags)
 578 {
 579         struct ext4_inode_info *ei = EXT4_I(inode);
 580         handle_t *handle = NULL;
 581         int err = -EPERM, migrate = 0;
 582         struct ext4_iloc iloc;
 583         unsigned int oldflags, mask, i;
 584         struct super_block *sb = inode->i_sb;
 585
 586         /* Is it quota file? Do not allow user to mess with it */
 587         if (ext4_is_quota_file(inode))
 588                 goto flags_out;
 589
 590         oldflags = ei->i_flags;
 591         /*
 592          * The JOURNAL_DATA flag can only be changed by
 593          * the relevant capability.
 594          */
 595         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 596                 if (!capable(CAP_SYS_RESOURCE))
 597                         goto flags_out;
 598         }
 599
 600         if (!dax_compatible(inode, oldflags, flags)) {
 601                 err = -EOPNOTSUPP;
 602                 goto flags_out;
 603         }
 604
 605         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 606                 migrate = 1;
 607
 608         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 609                 if (!ext4_has_feature_casefold(sb)) {
 610                         err = -EOPNOTSUPP;
 611                         goto flags_out;
 612                 }
 613
 614                 if (!S_ISDIR(inode->i_mode)) {
 615                         err = -ENOTDIR;
 616                         goto flags_out;
 617                 }
 618
 619                 if (!ext4_empty_dir(inode)) {
 620                         err = -ENOTEMPTY;
 621                         goto flags_out;
 622                 }
 623         }
 624
 625         /*
 626          * Wait for all pending directio and then flush all the dirty pages
 627          * for this file.  The flush marks all the pages readonly, so any
 628          * subsequent attempt to write to the file (particularly mmap pages)
 629          * will come through the filesystem and fail.
 630          */
 631         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 632             (flags & EXT4_IMMUTABLE_FL)) {
 633                 inode_dio_wait(inode);
 634                 err = filemap_write_and_wait(inode->i_mapping);
 635                 if (err)
 636                         goto flags_out;
 637         }
 638
 639         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 640         if (IS_ERR(handle)) {
 641                 err = PTR_ERR(handle);
 642                 goto flags_out;
 643         }
 644         if (IS_SYNC(inode))
 645                 ext4_handle_sync(handle);
 646         err = ext4_reserve_inode_write(handle, inode, &iloc);
 647         if (err)
 648                 goto flags_err;
 649
 650         ext4_dax_dontcache(inode, flags);
 651
 652         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 653                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 654                         continue;
 655                 /* These flags get special treatment later */
 656                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 657                         continue;
 658                 if (mask & flags)
 659                         ext4_set_inode_flag(inode, i);
 660                 else
 661                         ext4_clear_inode_flag(inode, i);
 662         }
 663
 664         ext4_set_inode_flags(inode, false);
 665
 666         inode->i_ctime = current_time(inode);
 667         inode_inc_iversion(inode);
 668
 669         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 670 flags_err:
 671         ext4_journal_stop(handle);
 672         if (err)
 673                 goto flags_out;
 674
 675         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 676                 /*
 677                  * Changes to the journaling mode can cause unsafe changes to
 678                  * S_DAX if the inode is DAX
 679                  */
 680                 if (IS_DAX(inode)) {
 681                         err = -EBUSY;
 682                         goto flags_out;
 683                 }
 684
 685                 err = ext4_change_inode_journal_flag(inode,
 686                                                      flags & EXT4_JOURNAL_DATA_FL);
 687                 if (err)
 688                         goto flags_out;
 689         }
 690         if (migrate) {
 691                 if (flags & EXT4_EXTENTS_FL)
 692                         err = ext4_ext_migrate(inode);
 693                 else
 694                         err = ext4_ind_migrate(inode);
 695         }
 696
 697 flags_out:
 698         return err;
 699 }
 700
 701 #ifdef CONFIG_QUOTA
 702 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 703 {
 704         struct super_block *sb = inode->i_sb;
 705         struct ext4_inode_info *ei = EXT4_I(inode);
 706         int err, rc;
 707         handle_t *handle;
 708         kprojid_t kprojid;
 709         struct ext4_iloc iloc;
 710         struct ext4_inode *raw_inode;
 711         struct dquot *transfer_to[MAXQUOTAS] = { };
 712
 713         if (!ext4_has_feature_project(sb)) {
 714                 if (projid != EXT4_DEF_PROJID)
 715                         return -EOPNOTSUPP;
 716                 else
 717                         return 0;
 718         }
 719
 720         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 721                 return -EOPNOTSUPP;
 722
 723         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 724
 725         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 726                 return 0;
 727
 728         err = -EPERM;
 729         /* Is it quota file? Do not allow user to mess with it */
 730         if (ext4_is_quota_file(inode))
 731                 return err;
 732
 733         err = dquot_initialize(inode);
 734         if (err)
 735                 return err;
 736
 737         err = ext4_get_inode_loc(inode, &iloc);
 738         if (err)
 739                 return err;
 740
 741         raw_inode = ext4_raw_inode(&iloc);
 742         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 743                 err = ext4_expand_extra_isize(inode,
 744                                               EXT4_SB(sb)->s_want_extra_isize,
 745                                               &iloc);
 746                 if (err)
 747                         return err;
 748         } else {
 749                 brelse(iloc.bh);
 750         }
 751
 752         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 753                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 754                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 755         if (IS_ERR(handle))
 756                 return PTR_ERR(handle);
 757
 758         err = ext4_reserve_inode_write(handle, inode, &iloc);
 759         if (err)
 760                 goto out_stop;
 761
 762         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 763         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 764
 765                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 766                  * counts xattr inode references.
 767                  */
 768                 down_read(&EXT4_I(inode)->xattr_sem);
 769                 err = __dquot_transfer(inode, transfer_to);
 770                 up_read(&EXT4_I(inode)->xattr_sem);
 771                 dqput(transfer_to[PRJQUOTA]);
 772                 if (err)
 773                         goto out_dirty;
 774         }
 775
 776         EXT4_I(inode)->i_projid = kprojid;
 777         inode->i_ctime = current_time(inode);
 778         inode_inc_iversion(inode);
 779 out_dirty:
 780         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 781         if (!err)
 782                 err = rc;
 783 out_stop:
 784         ext4_journal_stop(handle);
 785         return err;
 786 }
 787 #else
 788 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 789 {
 790         if (projid != EXT4_DEF_PROJID)
 791                 return -EOPNOTSUPP;
 792         return 0;
 793 }
 794 #endif
 795
 796 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 797 {
 798         struct ext4_sb_info *sbi = EXT4_SB(sb);
 799         __u32 flags;
 800
 801         if (!capable(CAP_SYS_ADMIN))
 802                 return -EPERM;
 803
 804         if (get_user(flags, (__u32 __user *)arg))
 805                 return -EFAULT;
 806
 807         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 808                 return -EINVAL;
 809
 810         if (ext4_forced_shutdown(sbi))
 811                 return 0;
 812
 813         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 814         trace_ext4_shutdown(sb, flags);
 815
 816         switch (flags) {
 817         case EXT4_GOING_FLAGS_DEFAULT:
 818                 freeze_bdev(sb->s_bdev);
 819                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 820                 thaw_bdev(sb->s_bdev);
 821                 break;
 822         case EXT4_GOING_FLAGS_LOGFLUSH:
 823                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 824                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 825                         (void) ext4_force_commit(sb);
 826                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 827                 }
 828                 break;
 829         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 830                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 831                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 832                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 833                 break;
 834         default:
 835                 return -EINVAL;
 836         }
 837         clear_opt(sb, DISCARD);
 838         return 0;
 839 }
 840
 841 struct getfsmap_info {
 842         struct super_block      *gi_sb;
 843         struct fsmap_head __user *gi_data;
 844         unsigned int            gi_idx;
 845         __u32                   gi_last_flags;
 846 };
 847
 848 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 849 {
 850         struct getfsmap_info *info = priv;
 851         struct fsmap fm;
 852
 853         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 854
 855         info->gi_last_flags = xfm->fmr_flags;
 856         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 857         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 858                         sizeof(struct fsmap)))
 859                 return -EFAULT;
 860
 861         return 0;
 862 }
 863
 864 static int ext4_ioc_getfsmap(struct super_block *sb,
 865                              struct fsmap_head __user *arg)
 866 {
 867         struct getfsmap_info info = { NULL };
 868         struct ext4_fsmap_head xhead = {0};
 869         struct fsmap_head head;
 870         bool aborted = false;
 871         int error;
 872
 873         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 874                 return -EFAULT;
 875         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 876             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 877                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 878             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 879                        sizeof(head.fmh_keys[1].fmr_reserved)))
 880                 return -EINVAL;
 881         /*
 882          * ext4 doesn't report file extents at all, so the only valid
 883          * file offsets are the magic ones (all zeroes or all ones).
 884          */
 885         if (head.fmh_keys[0].fmr_offset ||
 886             (head.fmh_keys[1].fmr_offset != 0 &&
 887              head.fmh_keys[1].fmr_offset != -1ULL))
 888                 return -EINVAL;
 889
 890         xhead.fmh_iflags = head.fmh_iflags;
 891         xhead.fmh_count = head.fmh_count;
 892         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 893         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 894
 895         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 896         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 897
 898         info.gi_sb = sb;
 899         info.gi_data = arg;
 900         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 901         if (error == EXT4_QUERY_RANGE_ABORT)
 902                 aborted = true;
 903         else if (error)
 904                 return error;
 905
 906         /* If we didn't abort, set the "last" flag in the last fmx */
 907         if (!aborted && info.gi_idx) {
 908                 info.gi_last_flags |= FMR_OF_LAST;
 909                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 910                                  &info.gi_last_flags,
 911                                  sizeof(info.gi_last_flags)))
 912                         return -EFAULT;
 913         }
 914
 915         /* copy back header */
 916         head.fmh_entries = xhead.fmh_entries;
 917         head.fmh_oflags = xhead.fmh_oflags;
 918         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 919                 return -EFAULT;
 920
 921         return 0;
 922 }
 923
 924 static long ext4_ioctl_group_add(struct file *file,
 925                                  struct ext4_new_group_data *input)
 926 {
 927         struct super_block *sb = file_inode(file)->i_sb;
 928         int err, err2=0;
 929
 930         err = ext4_resize_begin(sb);
 931         if (err)
 932                 return err;
 933
 934         if (ext4_has_feature_bigalloc(sb)) {
 935                 ext4_msg(sb, KERN_ERR,
 936                          "Online resizing not supported with bigalloc");
 937                 err = -EOPNOTSUPP;
 938                 goto group_add_out;
 939         }
 940
 941         err = mnt_want_write_file(file);
 942         if (err)
 943                 goto group_add_out;
 944
 945         err = ext4_group_add(sb, input);
 946         if (EXT4_SB(sb)->s_journal) {
 947                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 948                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 949                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 950         }
 951         if (err == 0)
 952                 err = err2;
 953         mnt_drop_write_file(file);
 954         if (!err && ext4_has_group_desc_csum(sb) &&
 955             test_opt(sb, INIT_INODE_TABLE))
 956                 err = ext4_register_li_request(sb, input->group);
 957 group_add_out:
 958         err2 = ext4_resize_end(sb, false);
 959         if (err == 0)
 960                 err = err2;
 961         return err;
 962 }
 963
 964 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 965 {
 966         struct inode *inode = d_inode(dentry);
 967         struct ext4_inode_info *ei = EXT4_I(inode);
 968         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 969
 970         if (S_ISREG(inode->i_mode))
 971                 flags &= ~FS_PROJINHERIT_FL;
 972
 973         fileattr_fill_flags(fa, flags);
 974         if (ext4_has_feature_project(inode->i_sb))
 975                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 976
 977         return 0;
 978 }
 979
 980 int ext4_fileattr_set(struct mnt_idmap *idmap,
 981                       struct dentry *dentry, struct fileattr *fa)
 982 {
 983         struct inode *inode = d_inode(dentry);
 984         u32 flags = fa->flags;
 985         int err = -EOPNOTSUPP;
 986
 987         if (flags & ~EXT4_FL_USER_VISIBLE)
 988                 goto out;
 989
 990         /*
 991          * chattr(1) grabs flags via GETFLAGS, modifies the result and
 992          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 993          * more restrictive than just silently masking off visible but
 994          * not settable flags as we always did.
 995          */
 996         flags &= EXT4_FL_USER_MODIFIABLE;
 997         if (ext4_mask_flags(inode->i_mode, flags) != flags)
 998                 goto out;
 999         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1000         if (err)
1001                 goto out;
1002         err = ext4_ioctl_setflags(inode, flags);
1003         if (err)
1004                 goto out;
1005         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1006 out:
1007         return err;
1008 }
1009
1010 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1011 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1012
1013 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1014 {
1015         struct fiemap fiemap;
1016         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1017         struct fiemap_extent_info fieinfo = { 0, };
1018         struct inode *inode = file_inode(filp);
1019         int error;
1020
1021         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1022                 return -EFAULT;
1023
1024         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1025                 return -EINVAL;
1026
1027         fieinfo.fi_flags = fiemap.fm_flags;
1028         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1029         fieinfo.fi_extents_start = ufiemap->fm_extents;
1030
1031         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1032                         fiemap.fm_length);
1033         fiemap.fm_flags = fieinfo.fi_flags;
1034         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1035         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1036                 error = -EFAULT;
1037
1038         return error;
1039 }
1040
1041 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1042 {
1043         int err = 0;
1044         __u32 flags = 0;
1045         unsigned int flush_flags = 0;
1046         struct super_block *sb = file_inode(filp)->i_sb;
1047
1048         if (copy_from_user(&flags, (__u32 __user *)arg,
1049                                 sizeof(__u32)))
1050                 return -EFAULT;
1051
1052         if (!capable(CAP_SYS_ADMIN))
1053                 return -EPERM;
1054
1055         /* check for invalid bits set */
1056         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1057                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1058                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1059                 return -EINVAL;
1060
1061         if (!EXT4_SB(sb)->s_journal)
1062                 return -ENODEV;
1063
1064         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1065             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1066                 return -EOPNOTSUPP;
1067
1068         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1069                 return 0;
1070
1071         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1072                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1073
1074         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1075                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1076                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1077         }
1078
1079         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1080         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1081         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1082
1083         return err;
1084 }
1085
1086 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1087 {
1088         size_t len;
1089         int ret = 0;
1090         char new_label[EXT4_LABEL_MAX + 1];
1091         struct super_block *sb = file_inode(filp)->i_sb;
1092
1093         if (!capable(CAP_SYS_ADMIN))
1094                 return -EPERM;
1095
1096         /*
1097          * Copy the maximum length allowed for ext4 label with one more to
1098          * find the required terminating null byte in order to test the
1099          * label length. The on disk label doesn't need to be null terminated.
1100          */
1101         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1102                 return -EFAULT;
1103
1104         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1105         if (len > EXT4_LABEL_MAX)
1106                 return -EINVAL;
1107
1108         /*
1109          * Clear the buffer after the new label
1110          */
1111         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1112
1113         ret = mnt_want_write_file(filp);
1114         if (ret)
1115                 return ret;
1116
1117         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1118
1119         mnt_drop_write_file(filp);
1120         return ret;
1121 }
1122
1123 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1124 {
1125         char label[EXT4_LABEL_MAX + 1];
1126
1127         /*
1128          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1129          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1130          * does not have to.
1131          */
1132         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1133
1134         memset(label, 0, sizeof(label));
1135         lock_buffer(sbi->s_sbh);
1136         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1137         unlock_buffer(sbi->s_sbh);
1138
1139         if (copy_to_user(user_label, label, sizeof(label)))
1140                 return -EFAULT;
1141         return 0;
1142 }
1143
1144 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1145                         struct fsuuid __user *ufsuuid)
1146 {
1147         struct fsuuid fsuuid;
1148         __u8 uuid[UUID_SIZE];
1149
1150         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1151                 return -EFAULT;
1152
1153         if (fsuuid.fsu_len == 0) {
1154                 fsuuid.fsu_len = UUID_SIZE;
1155                 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1156                                         sizeof(fsuuid.fsu_len)))
1157                         return -EFAULT;
1158                 return 0;
1159         }
1160
1161         if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1162                 return -EINVAL;
1163
1164         lock_buffer(sbi->s_sbh);
1165         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1166         unlock_buffer(sbi->s_sbh);
1167
1168         fsuuid.fsu_len = UUID_SIZE;
1169         if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1170             copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1171                 return -EFAULT;
1172         return 0;
1173 }
1174
1175 static int ext4_ioctl_setuuid(struct file *filp,
1176                         const struct fsuuid __user *ufsuuid)
1177 {
1178         int ret = 0;
1179         struct super_block *sb = file_inode(filp)->i_sb;
1180         struct fsuuid fsuuid;
1181         __u8 uuid[UUID_SIZE];
1182
1183         if (!capable(CAP_SYS_ADMIN))
1184                 return -EPERM;
1185
1186         /*
1187          * If any checksums (group descriptors or metadata) are being used
1188          * then the checksum seed feature is required to change the UUID.
1189          */
1190         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1191                         && !ext4_has_feature_csum_seed(sb))
1192                 || ext4_has_feature_stable_inodes(sb))
1193                 return -EOPNOTSUPP;
1194
1195         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1196                 return -EFAULT;
1197
1198         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1199                 return -EINVAL;
1200
1201         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1202                 return -EFAULT;
1203
1204         ret = mnt_want_write_file(filp);
1205         if (ret)
1206                 return ret;
1207
1208         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1209         mnt_drop_write_file(filp);
1210
1211         return ret;
1212 }
1213
1214 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1215 {
1216         struct inode *inode = file_inode(filp);
1217         struct super_block *sb = inode->i_sb;
1218         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1219
1220         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1221
1222         switch (cmd) {
1223         case FS_IOC_GETFSMAP:
1224                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1225         case EXT4_IOC_GETVERSION:
1226         case EXT4_IOC_GETVERSION_OLD:
1227                 return put_user(inode->i_generation, (int __user *) arg);
1228         case EXT4_IOC_SETVERSION:
1229         case EXT4_IOC_SETVERSION_OLD: {
1230                 handle_t *handle;
1231                 struct ext4_iloc iloc;
1232                 __u32 generation;
1233                 int err;
1234
1235                 if (!inode_owner_or_capable(idmap, inode))
1236                         return -EPERM;
1237
1238                 if (ext4_has_metadata_csum(inode->i_sb)) {
1239                         ext4_warning(sb, "Setting inode version is not "
1240                                      "supported with metadata_csum enabled.");
1241                         return -ENOTTY;
1242                 }
1243
1244                 err = mnt_want_write_file(filp);
1245                 if (err)
1246                         return err;
1247                 if (get_user(generation, (int __user *) arg)) {
1248                         err = -EFAULT;
1249                         goto setversion_out;
1250                 }
1251
1252                 inode_lock(inode);
1253                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1254                 if (IS_ERR(handle)) {
1255                         err = PTR_ERR(handle);
1256                         goto unlock_out;
1257                 }
1258                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1259                 if (err == 0) {
1260                         inode->i_ctime = current_time(inode);
1261                         inode_inc_iversion(inode);
1262                         inode->i_generation = generation;
1263                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1264                 }
1265                 ext4_journal_stop(handle);
1266
1267 unlock_out:
1268                 inode_unlock(inode);
1269 setversion_out:
1270                 mnt_drop_write_file(filp);
1271                 return err;
1272         }
1273         case EXT4_IOC_GROUP_EXTEND: {
1274                 ext4_fsblk_t n_blocks_count;
1275                 int err, err2=0;
1276
1277                 err = ext4_resize_begin(sb);
1278                 if (err)
1279                         return err;
1280
1281                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1282                         err = -EFAULT;
1283                         goto group_extend_out;
1284                 }
1285
1286                 if (ext4_has_feature_bigalloc(sb)) {
1287                         ext4_msg(sb, KERN_ERR,
1288                                  "Online resizing not supported with bigalloc");
1289                         err = -EOPNOTSUPP;
1290                         goto group_extend_out;
1291                 }
1292
1293                 err = mnt_want_write_file(filp);
1294                 if (err)
1295                         goto group_extend_out;
1296
1297                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1298                 if (EXT4_SB(sb)->s_journal) {
1299                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1300                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1301                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1302                 }
1303                 if (err == 0)
1304                         err = err2;
1305                 mnt_drop_write_file(filp);
1306 group_extend_out:
1307                 err2 = ext4_resize_end(sb, false);
1308                 if (err == 0)
1309                         err = err2;
1310                 return err;
1311         }
1312
1313         case EXT4_IOC_MOVE_EXT: {
1314                 struct move_extent me;
1315                 struct fd donor;
1316                 int err;
1317
1318                 if (!(filp->f_mode & FMODE_READ) ||
1319                     !(filp->f_mode & FMODE_WRITE))
1320                         return -EBADF;
1321
1322                 if (copy_from_user(&me,
1323                         (struct move_extent __user *)arg, sizeof(me)))
1324                         return -EFAULT;
1325                 me.moved_len = 0;
1326
1327                 donor = fdget(me.donor_fd);
1328                 if (!donor.file)
1329                         return -EBADF;
1330
1331                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1332                         err = -EBADF;
1333                         goto mext_out;
1334                 }
1335
1336                 if (ext4_has_feature_bigalloc(sb)) {
1337                         ext4_msg(sb, KERN_ERR,
1338                                  "Online defrag not supported with bigalloc");
1339                         err = -EOPNOTSUPP;
1340                         goto mext_out;
1341                 } else if (IS_DAX(inode)) {
1342                         ext4_msg(sb, KERN_ERR,
1343                                  "Online defrag not supported with DAX");
1344                         err = -EOPNOTSUPP;
1345                         goto mext_out;
1346                 }
1347
1348                 err = mnt_want_write_file(filp);
1349                 if (err)
1350                         goto mext_out;
1351
1352                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1353                                         me.donor_start, me.len, &me.moved_len);
1354                 mnt_drop_write_file(filp);
1355
1356                 if (copy_to_user((struct move_extent __user *)arg,
1357                                  &me, sizeof(me)))
1358                         err = -EFAULT;
1359 mext_out:
1360                 fdput(donor);
1361                 return err;
1362         }
1363
1364         case EXT4_IOC_GROUP_ADD: {
1365                 struct ext4_new_group_data input;
1366
1367                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1368                                 sizeof(input)))
1369                         return -EFAULT;
1370
1371                 return ext4_ioctl_group_add(filp, &input);
1372         }
1373
1374         case EXT4_IOC_MIGRATE:
1375         {
1376                 int err;
1377                 if (!inode_owner_or_capable(idmap, inode))
1378                         return -EACCES;
1379
1380                 err = mnt_want_write_file(filp);
1381                 if (err)
1382                         return err;
1383                 /*
1384                  * inode_mutex prevent write and truncate on the file.
1385                  * Read still goes through. We take i_data_sem in
1386                  * ext4_ext_swap_inode_data before we switch the
1387                  * inode format to prevent read.
1388                  */
1389                 inode_lock((inode));
1390                 err = ext4_ext_migrate(inode);
1391                 inode_unlock((inode));
1392                 mnt_drop_write_file(filp);
1393                 return err;
1394         }
1395
1396         case EXT4_IOC_ALLOC_DA_BLKS:
1397         {
1398                 int err;
1399                 if (!inode_owner_or_capable(idmap, inode))
1400                         return -EACCES;
1401
1402                 err = mnt_want_write_file(filp);
1403                 if (err)
1404                         return err;
1405                 err = ext4_alloc_da_blocks(inode);
1406                 mnt_drop_write_file(filp);
1407                 return err;
1408         }
1409
1410         case EXT4_IOC_SWAP_BOOT:
1411         {
1412                 int err;
1413                 if (!(filp->f_mode & FMODE_WRITE))
1414                         return -EBADF;
1415                 err = mnt_want_write_file(filp);
1416                 if (err)
1417                         return err;
1418                 err = swap_inode_boot_loader(sb, idmap, inode);
1419                 mnt_drop_write_file(filp);
1420                 return err;
1421         }
1422
1423         case EXT4_IOC_RESIZE_FS: {
1424                 ext4_fsblk_t n_blocks_count;
1425                 int err = 0, err2 = 0;
1426                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1427
1428                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1429                                    sizeof(__u64))) {
1430                         return -EFAULT;
1431                 }
1432
1433                 err = ext4_resize_begin(sb);
1434                 if (err)
1435                         return err;
1436
1437                 err = mnt_want_write_file(filp);
1438                 if (err)
1439                         goto resizefs_out;
1440
1441                 err = ext4_resize_fs(sb, n_blocks_count);
1442                 if (EXT4_SB(sb)->s_journal) {
1443                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1444                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1445                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1446                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1447                 }
1448                 if (err == 0)
1449                         err = err2;
1450                 mnt_drop_write_file(filp);
1451                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1452                     ext4_has_group_desc_csum(sb) &&
1453                     test_opt(sb, INIT_INODE_TABLE))
1454                         err = ext4_register_li_request(sb, o_group);
1455
1456 resizefs_out:
1457                 err2 = ext4_resize_end(sb, true);
1458                 if (err == 0)
1459                         err = err2;
1460                 return err;
1461         }
1462
1463         case FITRIM:
1464         {
1465                 struct fstrim_range range;
1466                 int ret = 0;
1467
1468                 if (!capable(CAP_SYS_ADMIN))
1469                         return -EPERM;
1470
1471                 if (!bdev_max_discard_sectors(sb->s_bdev))
1472                         return -EOPNOTSUPP;
1473
1474                 /*
1475                  * We haven't replayed the journal, so we cannot use our
1476                  * block-bitmap-guided storage zapping commands.
1477                  */
1478                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1479                         return -EROFS;
1480
1481                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1482                     sizeof(range)))
1483                         return -EFAULT;
1484
1485                 ret = ext4_trim_fs(sb, &range);
1486                 if (ret < 0)
1487                         return ret;
1488
1489                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1490                     sizeof(range)))
1491                         return -EFAULT;
1492
1493                 return 0;
1494         }
1495         case EXT4_IOC_PRECACHE_EXTENTS:
1496                 return ext4_ext_precache(inode);
1497
1498         case FS_IOC_SET_ENCRYPTION_POLICY:
1499                 if (!ext4_has_feature_encrypt(sb))
1500                         return -EOPNOTSUPP;
1501                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1502
1503         case FS_IOC_GET_ENCRYPTION_PWSALT:
1504                 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1505
1506         case FS_IOC_GET_ENCRYPTION_POLICY:
1507                 if (!ext4_has_feature_encrypt(sb))
1508                         return -EOPNOTSUPP;
1509                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1510
1511         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1512                 if (!ext4_has_feature_encrypt(sb))
1513                         return -EOPNOTSUPP;
1514                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1515
1516         case FS_IOC_ADD_ENCRYPTION_KEY:
1517                 if (!ext4_has_feature_encrypt(sb))
1518                         return -EOPNOTSUPP;
1519                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1520
1521         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1522                 if (!ext4_has_feature_encrypt(sb))
1523                         return -EOPNOTSUPP;
1524                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1525
1526         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1527                 if (!ext4_has_feature_encrypt(sb))
1528                         return -EOPNOTSUPP;
1529                 return fscrypt_ioctl_remove_key_all_users(filp,
1530                                                           (void __user *)arg);
1531         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1532                 if (!ext4_has_feature_encrypt(sb))
1533                         return -EOPNOTSUPP;
1534                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1535
1536         case FS_IOC_GET_ENCRYPTION_NONCE:
1537                 if (!ext4_has_feature_encrypt(sb))
1538                         return -EOPNOTSUPP;
1539                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1540
1541         case EXT4_IOC_CLEAR_ES_CACHE:
1542         {
1543                 if (!inode_owner_or_capable(idmap, inode))
1544                         return -EACCES;
1545                 ext4_clear_inode_es(inode);
1546                 return 0;
1547         }
1548
1549         case EXT4_IOC_GETSTATE:
1550         {
1551                 __u32   state = 0;
1552
1553                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1554                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1555                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1556                         state |= EXT4_STATE_FLAG_NEW;
1557                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1558                         state |= EXT4_STATE_FLAG_NEWENTRY;
1559                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1560                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1561
1562                 return put_user(state, (__u32 __user *) arg);
1563         }
1564
1565         case EXT4_IOC_GET_ES_CACHE:
1566                 return ext4_ioctl_get_es_cache(filp, arg);
1567
1568         case EXT4_IOC_SHUTDOWN:
1569                 return ext4_shutdown(sb, arg);
1570
1571         case FS_IOC_ENABLE_VERITY:
1572                 if (!ext4_has_feature_verity(sb))
1573                         return -EOPNOTSUPP;
1574                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1575
1576         case FS_IOC_MEASURE_VERITY:
1577                 if (!ext4_has_feature_verity(sb))
1578                         return -EOPNOTSUPP;
1579                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1580
1581         case FS_IOC_READ_VERITY_METADATA:
1582                 if (!ext4_has_feature_verity(sb))
1583                         return -EOPNOTSUPP;
1584                 return fsverity_ioctl_read_metadata(filp,
1585                                                     (const void __user *)arg);
1586
1587         case EXT4_IOC_CHECKPOINT:
1588                 return ext4_ioctl_checkpoint(filp, arg);
1589
1590         case FS_IOC_GETFSLABEL:
1591                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1592
1593         case FS_IOC_SETFSLABEL:
1594                 return ext4_ioctl_setlabel(filp,
1595                                            (const void __user *)arg);
1596
1597         case EXT4_IOC_GETFSUUID:
1598                 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1599         case EXT4_IOC_SETFSUUID:
1600                 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1601         default:
1602                 return -ENOTTY;
1603         }
1604 }
1605
1606 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1607 {
1608         return __ext4_ioctl(filp, cmd, arg);
1609 }
1610
1611 #ifdef CONFIG_COMPAT
1612 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1613 {
1614         /* These are just misnamed, they actually get/put from/to user an int */
1615         switch (cmd) {
1616         case EXT4_IOC32_GETVERSION:
1617                 cmd = EXT4_IOC_GETVERSION;
1618                 break;
1619         case EXT4_IOC32_SETVERSION:
1620                 cmd = EXT4_IOC_SETVERSION;
1621                 break;
1622         case EXT4_IOC32_GROUP_EXTEND:
1623                 cmd = EXT4_IOC_GROUP_EXTEND;
1624                 break;
1625         case EXT4_IOC32_GETVERSION_OLD:
1626                 cmd = EXT4_IOC_GETVERSION_OLD;
1627                 break;
1628         case EXT4_IOC32_SETVERSION_OLD:
1629                 cmd = EXT4_IOC_SETVERSION_OLD;
1630                 break;
1631         case EXT4_IOC32_GETRSVSZ:
1632                 cmd = EXT4_IOC_GETRSVSZ;
1633                 break;
1634         case EXT4_IOC32_SETRSVSZ:
1635                 cmd = EXT4_IOC_SETRSVSZ;
1636                 break;
1637         case EXT4_IOC32_GROUP_ADD: {
1638                 struct compat_ext4_new_group_input __user *uinput;
1639                 struct ext4_new_group_data input;
1640                 int err;
1641
1642                 uinput = compat_ptr(arg);
1643                 err = get_user(input.group, &uinput->group);
1644                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1645                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1646                 err |= get_user(input.inode_table, &uinput->inode_table);
1647                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1648                 err |= get_user(input.reserved_blocks,
1649                                 &uinput->reserved_blocks);
1650                 if (err)
1651                         return -EFAULT;
1652                 return ext4_ioctl_group_add(file, &input);
1653         }
1654         case EXT4_IOC_MOVE_EXT:
1655         case EXT4_IOC_RESIZE_FS:
1656         case FITRIM:
1657         case EXT4_IOC_PRECACHE_EXTENTS:
1658         case FS_IOC_SET_ENCRYPTION_POLICY:
1659         case FS_IOC_GET_ENCRYPTION_PWSALT:
1660         case FS_IOC_GET_ENCRYPTION_POLICY:
1661         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1662         case FS_IOC_ADD_ENCRYPTION_KEY:
1663         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1664         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1665         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1666         case FS_IOC_GET_ENCRYPTION_NONCE:
1667         case EXT4_IOC_SHUTDOWN:
1668         case FS_IOC_GETFSMAP:
1669         case FS_IOC_ENABLE_VERITY:
1670         case FS_IOC_MEASURE_VERITY:
1671         case FS_IOC_READ_VERITY_METADATA:
1672         case EXT4_IOC_CLEAR_ES_CACHE:
1673         case EXT4_IOC_GETSTATE:
1674         case EXT4_IOC_GET_ES_CACHE:
1675         case EXT4_IOC_CHECKPOINT:
1676         case FS_IOC_GETFSLABEL:
1677         case FS_IOC_SETFSLABEL:
1678         case EXT4_IOC_GETFSUUID:
1679         case EXT4_IOC_SETFSUUID:
1680                 break;
1681         default:
1682                 return -ENOIOCTLCMD;
1683         }
1684         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1685 }
1686 #endif
1687
1688 static void set_overhead(struct ext4_super_block *es, const void *arg)
1689 {
1690         es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1691 }
1692
1693 int ext4_update_overhead(struct super_block *sb, bool force)
1694 {
1695         struct ext4_sb_info *sbi = EXT4_SB(sb);
1696
1697         if (sb_rdonly(sb))
1698                 return 0;
1699         if (!force &&
1700             (sbi->s_overhead == 0 ||
1701              sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1702                 return 0;
1703         return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1704 }