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