fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card ([email protected])
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/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,
 378                         EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
 379         if (IS_ERR(inode_bl))
 380                 return PTR_ERR(inode_bl);
 381         ei_bl = EXT4_I(inode_bl);
 382
 383         /* Protect orig inodes against a truncate and make sure,
 384          * that only 1 swap_inode_boot_loader is running. */
 385         lock_two_nondirectories(inode, inode_bl);
 386
 387         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 388             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 389             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 390             ext4_has_inline_data(inode)) {
 391                 err = -EINVAL;
 392                 goto journal_err_out;
 393         }
 394
 395         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 396             !inode_owner_or_capable(mnt_userns, inode) ||
 397             !capable(CAP_SYS_ADMIN)) {
 398                 err = -EPERM;
 399                 goto journal_err_out;
 400         }
 401
 402         filemap_invalidate_lock(inode->i_mapping);
 403         err = filemap_write_and_wait(inode->i_mapping);
 404         if (err)
 405                 goto err_out;
 406
 407         err = filemap_write_and_wait(inode_bl->i_mapping);
 408         if (err)
 409                 goto err_out;
 410
 411         /* Wait for all existing dio workers */
 412         inode_dio_wait(inode);
 413         inode_dio_wait(inode_bl);
 414
 415         truncate_inode_pages(&inode->i_data, 0);
 416         truncate_inode_pages(&inode_bl->i_data, 0);
 417
 418         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 419         if (IS_ERR(handle)) {
 420                 err = -EINVAL;
 421                 goto err_out;
 422         }
 423         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
 424
 425         /* Protect extent tree against block allocations via delalloc */
 426         ext4_double_down_write_data_sem(inode, inode_bl);
 427
 428         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
 429                 /* this inode has never been used as a BOOT_LOADER */
 430                 set_nlink(inode_bl, 1);
 431                 i_uid_write(inode_bl, 0);
 432                 i_gid_write(inode_bl, 0);
 433                 inode_bl->i_flags = 0;
 434                 ei_bl->i_flags = 0;
 435                 inode_set_iversion(inode_bl, 1);
 436                 i_size_write(inode_bl, 0);
 437                 inode_bl->i_mode = S_IFREG;
 438                 if (ext4_has_feature_extents(sb)) {
 439                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 440                         ext4_ext_tree_init(handle, inode_bl);
 441                 } else
 442                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 443         }
 444
 445         err = dquot_initialize(inode);
 446         if (err)
 447                 goto err_out1;
 448
 449         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 450         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 451         diff = size - size_bl;
 452         swap_inode_data(inode, inode_bl);
 453
 454         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 455         inode_inc_iversion(inode);
 456
 457         inode->i_generation = get_random_u32();
 458         inode_bl->i_generation = get_random_u32();
 459         ext4_reset_inode_seed(inode);
 460         ext4_reset_inode_seed(inode_bl);
 461
 462         ext4_discard_preallocations(inode, 0);
 463
 464         err = ext4_mark_inode_dirty(handle, inode);
 465         if (err < 0) {
 466                 /* No need to update quota information. */
 467                 ext4_warning(inode->i_sb,
 468                         "couldn't mark inode #%lu dirty (err %d)",
 469                         inode->i_ino, err);
 470                 /* Revert all changes: */
 471                 swap_inode_data(inode, inode_bl);
 472                 ext4_mark_inode_dirty(handle, inode);
 473                 goto err_out1;
 474         }
 475
 476         blocks = inode_bl->i_blocks;
 477         bytes = inode_bl->i_bytes;
 478         inode_bl->i_blocks = inode->i_blocks;
 479         inode_bl->i_bytes = inode->i_bytes;
 480         err = ext4_mark_inode_dirty(handle, inode_bl);
 481         if (err < 0) {
 482                 /* No need to update quota information. */
 483                 ext4_warning(inode_bl->i_sb,
 484                         "couldn't mark inode #%lu dirty (err %d)",
 485                         inode_bl->i_ino, err);
 486                 goto revert;
 487         }
 488
 489         /* Bootloader inode should not be counted into quota information. */
 490         if (diff > 0)
 491                 dquot_free_space(inode, diff);
 492         else
 493                 err = dquot_alloc_space(inode, -1 * diff);
 494
 495         if (err < 0) {
 496 revert:
 497                 /* Revert all changes: */
 498                 inode_bl->i_blocks = blocks;
 499                 inode_bl->i_bytes = bytes;
 500                 swap_inode_data(inode, inode_bl);
 501                 ext4_mark_inode_dirty(handle, inode);
 502                 ext4_mark_inode_dirty(handle, inode_bl);
 503         }
 504
 505 err_out1:
 506         ext4_journal_stop(handle);
 507         ext4_double_up_write_data_sem(inode, inode_bl);
 508
 509 err_out:
 510         filemap_invalidate_unlock(inode->i_mapping);
 511 journal_err_out:
 512         unlock_two_nondirectories(inode, inode_bl);
 513         iput(inode_bl);
 514         return err;
 515 }
 516
 517 /*
 518  * If immutable is set and we are not clearing it, we're not allowed to change
 519  * anything else in the inode.  Don't error out if we're only trying to set
 520  * immutable on an immutable file.
 521  */
 522 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 523                                       unsigned int flags)
 524 {
 525         struct ext4_inode_info *ei = EXT4_I(inode);
 526         unsigned int oldflags = ei->i_flags;
 527
 528         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 529                 return 0;
 530
 531         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 532                 return -EPERM;
 533         if (ext4_has_feature_project(inode->i_sb) &&
 534             __kprojid_val(ei->i_projid) != new_projid)
 535                 return -EPERM;
 536
 537         return 0;
 538 }
 539
 540 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 541 {
 542         struct ext4_inode_info *ei = EXT4_I(inode);
 543
 544         if (S_ISDIR(inode->i_mode))
 545                 return;
 546
 547         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 548             test_opt(inode->i_sb, DAX_ALWAYS))
 549                 return;
 550
 551         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 552                 d_mark_dontcache(inode);
 553 }
 554
 555 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 556                            unsigned int flags)
 557 {
 558         /* Allow the DAX flag to be changed on inline directories */
 559         if (S_ISDIR(inode->i_mode)) {
 560                 flags &= ~EXT4_INLINE_DATA_FL;
 561                 oldflags &= ~EXT4_INLINE_DATA_FL;
 562         }
 563
 564         if (flags & EXT4_DAX_FL) {
 565                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 566                      ext4_test_inode_state(inode,
 567                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 568                         return false;
 569                 }
 570         }
 571
 572         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 573                         return false;
 574
 575         return true;
 576 }
 577
 578 static int ext4_ioctl_setflags(struct inode *inode,
 579                                unsigned int flags)
 580 {
 581         struct ext4_inode_info *ei = EXT4_I(inode);
 582         handle_t *handle = NULL;
 583         int err = -EPERM, migrate = 0;
 584         struct ext4_iloc iloc;
 585         unsigned int oldflags, mask, i;
 586         struct super_block *sb = inode->i_sb;
 587
 588         /* Is it quota file? Do not allow user to mess with it */
 589         if (ext4_is_quota_file(inode))
 590                 goto flags_out;
 591
 592         oldflags = ei->i_flags;
 593         /*
 594          * The JOURNAL_DATA flag can only be changed by
 595          * the relevant capability.
 596          */
 597         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 598                 if (!capable(CAP_SYS_RESOURCE))
 599                         goto flags_out;
 600         }
 601
 602         if (!dax_compatible(inode, oldflags, flags)) {
 603                 err = -EOPNOTSUPP;
 604                 goto flags_out;
 605         }
 606
 607         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 608                 migrate = 1;
 609
 610         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 611                 if (!ext4_has_feature_casefold(sb)) {
 612                         err = -EOPNOTSUPP;
 613                         goto flags_out;
 614                 }
 615
 616                 if (!S_ISDIR(inode->i_mode)) {
 617                         err = -ENOTDIR;
 618                         goto flags_out;
 619                 }
 620
 621                 if (!ext4_empty_dir(inode)) {
 622                         err = -ENOTEMPTY;
 623                         goto flags_out;
 624                 }
 625         }
 626
 627         /*
 628          * Wait for all pending directio and then flush all the dirty pages
 629          * for this file.  The flush marks all the pages readonly, so any
 630          * subsequent attempt to write to the file (particularly mmap pages)
 631          * will come through the filesystem and fail.
 632          */
 633         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 634             (flags & EXT4_IMMUTABLE_FL)) {
 635                 inode_dio_wait(inode);
 636                 err = filemap_write_and_wait(inode->i_mapping);
 637                 if (err)
 638                         goto flags_out;
 639         }
 640
 641         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 642         if (IS_ERR(handle)) {
 643                 err = PTR_ERR(handle);
 644                 goto flags_out;
 645         }
 646         if (IS_SYNC(inode))
 647                 ext4_handle_sync(handle);
 648         err = ext4_reserve_inode_write(handle, inode, &iloc);
 649         if (err)
 650                 goto flags_err;
 651
 652         ext4_dax_dontcache(inode, flags);
 653
 654         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 655                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 656                         continue;
 657                 /* These flags get special treatment later */
 658                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 659                         continue;
 660                 if (mask & flags)
 661                         ext4_set_inode_flag(inode, i);
 662                 else
 663                         ext4_clear_inode_flag(inode, i);
 664         }
 665
 666         ext4_set_inode_flags(inode, false);
 667
 668         inode->i_ctime = current_time(inode);
 669         inode_inc_iversion(inode);
 670
 671         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 672 flags_err:
 673         ext4_journal_stop(handle);
 674         if (err)
 675                 goto flags_out;
 676
 677         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 678                 /*
 679                  * Changes to the journaling mode can cause unsafe changes to
 680                  * S_DAX if the inode is DAX
 681                  */
 682                 if (IS_DAX(inode)) {
 683                         err = -EBUSY;
 684                         goto flags_out;
 685                 }
 686
 687                 err = ext4_change_inode_journal_flag(inode,
 688                                                      flags & EXT4_JOURNAL_DATA_FL);
 689                 if (err)
 690                         goto flags_out;
 691         }
 692         if (migrate) {
 693                 if (flags & EXT4_EXTENTS_FL)
 694                         err = ext4_ext_migrate(inode);
 695                 else
 696                         err = ext4_ind_migrate(inode);
 697         }
 698
 699 flags_out:
 700         return err;
 701 }
 702
 703 #ifdef CONFIG_QUOTA
 704 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 705 {
 706         struct super_block *sb = inode->i_sb;
 707         struct ext4_inode_info *ei = EXT4_I(inode);
 708         int err, rc;
 709         handle_t *handle;
 710         kprojid_t kprojid;
 711         struct ext4_iloc iloc;
 712         struct ext4_inode *raw_inode;
 713         struct dquot *transfer_to[MAXQUOTAS] = { };
 714
 715         if (!ext4_has_feature_project(sb)) {
 716                 if (projid != EXT4_DEF_PROJID)
 717                         return -EOPNOTSUPP;
 718                 else
 719                         return 0;
 720         }
 721
 722         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 723                 return -EOPNOTSUPP;
 724
 725         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 726
 727         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 728                 return 0;
 729
 730         err = -EPERM;
 731         /* Is it quota file? Do not allow user to mess with it */
 732         if (ext4_is_quota_file(inode))
 733                 return err;
 734
 735         err = dquot_initialize(inode);
 736         if (err)
 737                 return err;
 738
 739         err = ext4_get_inode_loc(inode, &iloc);
 740         if (err)
 741                 return err;
 742
 743         raw_inode = ext4_raw_inode(&iloc);
 744         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 745                 err = ext4_expand_extra_isize(inode,
 746                                               EXT4_SB(sb)->s_want_extra_isize,
 747                                               &iloc);
 748                 if (err)
 749                         return err;
 750         } else {
 751                 brelse(iloc.bh);
 752         }
 753
 754         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 755                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 756                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 757         if (IS_ERR(handle))
 758                 return PTR_ERR(handle);
 759
 760         err = ext4_reserve_inode_write(handle, inode, &iloc);
 761         if (err)
 762                 goto out_stop;
 763
 764         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 765         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 766
 767                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 768                  * counts xattr inode references.
 769                  */
 770                 down_read(&EXT4_I(inode)->xattr_sem);
 771                 err = __dquot_transfer(inode, transfer_to);
 772                 up_read(&EXT4_I(inode)->xattr_sem);
 773                 dqput(transfer_to[PRJQUOTA]);
 774                 if (err)
 775                         goto out_dirty;
 776         }
 777
 778         EXT4_I(inode)->i_projid = kprojid;
 779         inode->i_ctime = current_time(inode);
 780         inode_inc_iversion(inode);
 781 out_dirty:
 782         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 783         if (!err)
 784                 err = rc;
 785 out_stop:
 786         ext4_journal_stop(handle);
 787         return err;
 788 }
 789 #else
 790 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 791 {
 792         if (projid != EXT4_DEF_PROJID)
 793                 return -EOPNOTSUPP;
 794         return 0;
 795 }
 796 #endif
 797
 798 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 799 {
 800         struct ext4_sb_info *sbi = EXT4_SB(sb);
 801         __u32 flags;
 802
 803         if (!capable(CAP_SYS_ADMIN))
 804                 return -EPERM;
 805
 806         if (get_user(flags, (__u32 __user *)arg))
 807                 return -EFAULT;
 808
 809         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 810                 return -EINVAL;
 811
 812         if (ext4_forced_shutdown(sbi))
 813                 return 0;
 814
 815         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 816         trace_ext4_shutdown(sb, flags);
 817
 818         switch (flags) {
 819         case EXT4_GOING_FLAGS_DEFAULT:
 820                 freeze_bdev(sb->s_bdev);
 821                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 822                 thaw_bdev(sb->s_bdev);
 823                 break;
 824         case EXT4_GOING_FLAGS_LOGFLUSH:
 825                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 826                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 827                         (void) ext4_force_commit(sb);
 828                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 829                 }
 830                 break;
 831         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 832                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 833                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 834                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 835                 break;
 836         default:
 837                 return -EINVAL;
 838         }
 839         clear_opt(sb, DISCARD);
 840         return 0;
 841 }
 842
 843 struct getfsmap_info {
 844         struct super_block      *gi_sb;
 845         struct fsmap_head __user *gi_data;
 846         unsigned int            gi_idx;
 847         __u32                   gi_last_flags;
 848 };
 849
 850 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 851 {
 852         struct getfsmap_info *info = priv;
 853         struct fsmap fm;
 854
 855         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 856
 857         info->gi_last_flags = xfm->fmr_flags;
 858         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 859         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 860                         sizeof(struct fsmap)))
 861                 return -EFAULT;
 862
 863         return 0;
 864 }
 865
 866 static int ext4_ioc_getfsmap(struct super_block *sb,
 867                              struct fsmap_head __user *arg)
 868 {
 869         struct getfsmap_info info = { NULL };
 870         struct ext4_fsmap_head xhead = {0};
 871         struct fsmap_head head;
 872         bool aborted = false;
 873         int error;
 874
 875         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 876                 return -EFAULT;
 877         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 878             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 879                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 880             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 881                        sizeof(head.fmh_keys[1].fmr_reserved)))
 882                 return -EINVAL;
 883         /*
 884          * ext4 doesn't report file extents at all, so the only valid
 885          * file offsets are the magic ones (all zeroes or all ones).
 886          */
 887         if (head.fmh_keys[0].fmr_offset ||
 888             (head.fmh_keys[1].fmr_offset != 0 &&
 889              head.fmh_keys[1].fmr_offset != -1ULL))
 890                 return -EINVAL;
 891
 892         xhead.fmh_iflags = head.fmh_iflags;
 893         xhead.fmh_count = head.fmh_count;
 894         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 895         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 896
 897         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 898         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 899
 900         info.gi_sb = sb;
 901         info.gi_data = arg;
 902         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 903         if (error == EXT4_QUERY_RANGE_ABORT)
 904                 aborted = true;
 905         else if (error)
 906                 return error;
 907
 908         /* If we didn't abort, set the "last" flag in the last fmx */
 909         if (!aborted && info.gi_idx) {
 910                 info.gi_last_flags |= FMR_OF_LAST;
 911                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 912                                  &info.gi_last_flags,
 913                                  sizeof(info.gi_last_flags)))
 914                         return -EFAULT;
 915         }
 916
 917         /* copy back header */
 918         head.fmh_entries = xhead.fmh_entries;
 919         head.fmh_oflags = xhead.fmh_oflags;
 920         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 921                 return -EFAULT;
 922
 923         return 0;
 924 }
 925
 926 static long ext4_ioctl_group_add(struct file *file,
 927                                  struct ext4_new_group_data *input)
 928 {
 929         struct super_block *sb = file_inode(file)->i_sb;
 930         int err, err2=0;
 931
 932         err = ext4_resize_begin(sb);
 933         if (err)
 934                 return err;
 935
 936         if (ext4_has_feature_bigalloc(sb)) {
 937                 ext4_msg(sb, KERN_ERR,
 938                          "Online resizing not supported with bigalloc");
 939                 err = -EOPNOTSUPP;
 940                 goto group_add_out;
 941         }
 942
 943         err = mnt_want_write_file(file);
 944         if (err)
 945                 goto group_add_out;
 946
 947         err = ext4_group_add(sb, input);
 948         if (EXT4_SB(sb)->s_journal) {
 949                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 950                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 951                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 952         }
 953         if (err == 0)
 954                 err = err2;
 955         mnt_drop_write_file(file);
 956         if (!err && ext4_has_group_desc_csum(sb) &&
 957             test_opt(sb, INIT_INODE_TABLE))
 958                 err = ext4_register_li_request(sb, input->group);
 959 group_add_out:
 960         err2 = ext4_resize_end(sb, false);
 961         if (err == 0)
 962                 err = err2;
 963         return err;
 964 }
 965
 966 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 967 {
 968         struct inode *inode = d_inode(dentry);
 969         struct ext4_inode_info *ei = EXT4_I(inode);
 970         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 971
 972         if (S_ISREG(inode->i_mode))
 973                 flags &= ~FS_PROJINHERIT_FL;
 974
 975         fileattr_fill_flags(fa, flags);
 976         if (ext4_has_feature_project(inode->i_sb))
 977                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 978
 979         return 0;
 980 }
 981
 982 int ext4_fileattr_set(struct user_namespace *mnt_userns,
 983                       struct dentry *dentry, struct fileattr *fa)
 984 {
 985         struct inode *inode = d_inode(dentry);
 986         u32 flags = fa->flags;
 987         int err = -EOPNOTSUPP;
 988
 989         if (flags & ~EXT4_FL_USER_VISIBLE)
 990                 goto out;
 991
 992         /*
 993          * chattr(1) grabs flags via GETFLAGS, modifies the result and
 994          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 995          * more restrictive than just silently masking off visible but
 996          * not settable flags as we always did.
 997          */
 998         flags &= EXT4_FL_USER_MODIFIABLE;
 999         if (ext4_mask_flags(inode->i_mode, flags) != flags)
1000                 goto out;
1001         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1002         if (err)
1003                 goto out;
1004         err = ext4_ioctl_setflags(inode, flags);
1005         if (err)
1006                 goto out;
1007         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1008 out:
1009         return err;
1010 }
1011
1012 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1013 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1014
1015 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1016 {
1017         struct fiemap fiemap;
1018         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1019         struct fiemap_extent_info fieinfo = { 0, };
1020         struct inode *inode = file_inode(filp);
1021         int error;
1022
1023         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1024                 return -EFAULT;
1025
1026         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1027                 return -EINVAL;
1028
1029         fieinfo.fi_flags = fiemap.fm_flags;
1030         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1031         fieinfo.fi_extents_start = ufiemap->fm_extents;
1032
1033         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1034                         fiemap.fm_length);
1035         fiemap.fm_flags = fieinfo.fi_flags;
1036         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1037         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1038                 error = -EFAULT;
1039
1040         return error;
1041 }
1042
1043 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1044 {
1045         int err = 0;
1046         __u32 flags = 0;
1047         unsigned int flush_flags = 0;
1048         struct super_block *sb = file_inode(filp)->i_sb;
1049
1050         if (copy_from_user(&flags, (__u32 __user *)arg,
1051                                 sizeof(__u32)))
1052                 return -EFAULT;
1053
1054         if (!capable(CAP_SYS_ADMIN))
1055                 return -EPERM;
1056
1057         /* check for invalid bits set */
1058         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1059                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1060                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1061                 return -EINVAL;
1062
1063         if (!EXT4_SB(sb)->s_journal)
1064                 return -ENODEV;
1065
1066         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1067             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1068                 return -EOPNOTSUPP;
1069
1070         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1071                 return 0;
1072
1073         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1074                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1075
1076         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1077                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1078                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1079         }
1080
1081         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1082         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1083         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1084
1085         return err;
1086 }
1087
1088 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1089 {
1090         size_t len;
1091         int ret = 0;
1092         char new_label[EXT4_LABEL_MAX + 1];
1093         struct super_block *sb = file_inode(filp)->i_sb;
1094
1095         if (!capable(CAP_SYS_ADMIN))
1096                 return -EPERM;
1097
1098         /*
1099          * Copy the maximum length allowed for ext4 label with one more to
1100          * find the required terminating null byte in order to test the
1101          * label length. The on disk label doesn't need to be null terminated.
1102          */
1103         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1104                 return -EFAULT;
1105
1106         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1107         if (len > EXT4_LABEL_MAX)
1108                 return -EINVAL;
1109
1110         /*
1111          * Clear the buffer after the new label
1112          */
1113         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1114
1115         ret = mnt_want_write_file(filp);
1116         if (ret)
1117                 return ret;
1118
1119         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1120
1121         mnt_drop_write_file(filp);
1122         return ret;
1123 }
1124
1125 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1126 {
1127         char label[EXT4_LABEL_MAX + 1];
1128
1129         /*
1130          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1131          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1132          * does not have to.
1133          */
1134         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1135
1136         memset(label, 0, sizeof(label));
1137         lock_buffer(sbi->s_sbh);
1138         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1139         unlock_buffer(sbi->s_sbh);
1140
1141         if (copy_to_user(user_label, label, sizeof(label)))
1142                 return -EFAULT;
1143         return 0;
1144 }
1145
1146 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1147                         struct fsuuid __user *ufsuuid)
1148 {
1149         struct fsuuid fsuuid;
1150         __u8 uuid[UUID_SIZE];
1151
1152         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1153                 return -EFAULT;
1154
1155         if (fsuuid.fsu_len == 0) {
1156                 fsuuid.fsu_len = UUID_SIZE;
1157                 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1158                                         sizeof(fsuuid.fsu_len)))
1159                         return -EFAULT;
1160                 return 0;
1161         }
1162
1163         if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1164                 return -EINVAL;
1165
1166         lock_buffer(sbi->s_sbh);
1167         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1168         unlock_buffer(sbi->s_sbh);
1169
1170         fsuuid.fsu_len = UUID_SIZE;
1171         if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1172             copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1173                 return -EFAULT;
1174         return 0;
1175 }
1176
1177 static int ext4_ioctl_setuuid(struct file *filp,
1178                         const struct fsuuid __user *ufsuuid)
1179 {
1180         int ret = 0;
1181         struct super_block *sb = file_inode(filp)->i_sb;
1182         struct fsuuid fsuuid;
1183         __u8 uuid[UUID_SIZE];
1184
1185         if (!capable(CAP_SYS_ADMIN))
1186                 return -EPERM;
1187
1188         /*
1189          * If any checksums (group descriptors or metadata) are being used
1190          * then the checksum seed feature is required to change the UUID.
1191          */
1192         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1193                         && !ext4_has_feature_csum_seed(sb))
1194                 || ext4_has_feature_stable_inodes(sb))
1195                 return -EOPNOTSUPP;
1196
1197         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1198                 return -EFAULT;
1199
1200         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1201                 return -EINVAL;
1202
1203         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1204                 return -EFAULT;
1205
1206         ret = mnt_want_write_file(filp);
1207         if (ret)
1208                 return ret;
1209
1210         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1211         mnt_drop_write_file(filp);
1212
1213         return ret;
1214 }
1215
1216 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1217 {
1218         struct inode *inode = file_inode(filp);
1219         struct super_block *sb = inode->i_sb;
1220         struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
1221
1222         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1223
1224         switch (cmd) {
1225         case FS_IOC_GETFSMAP:
1226                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1227         case EXT4_IOC_GETVERSION:
1228         case EXT4_IOC_GETVERSION_OLD:
1229                 return put_user(inode->i_generation, (int __user *) arg);
1230         case EXT4_IOC_SETVERSION:
1231         case EXT4_IOC_SETVERSION_OLD: {
1232                 handle_t *handle;
1233                 struct ext4_iloc iloc;
1234                 __u32 generation;
1235                 int err;
1236
1237                 if (!inode_owner_or_capable(mnt_userns, inode))
1238                         return -EPERM;
1239
1240                 if (ext4_has_metadata_csum(inode->i_sb)) {
1241                         ext4_warning(sb, "Setting inode version is not "
1242                                      "supported with metadata_csum enabled.");
1243                         return -ENOTTY;
1244                 }
1245
1246                 err = mnt_want_write_file(filp);
1247                 if (err)
1248                         return err;
1249                 if (get_user(generation, (int __user *) arg)) {
1250                         err = -EFAULT;
1251                         goto setversion_out;
1252                 }
1253
1254                 inode_lock(inode);
1255                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1256                 if (IS_ERR(handle)) {
1257                         err = PTR_ERR(handle);
1258                         goto unlock_out;
1259                 }
1260                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1261                 if (err == 0) {
1262                         inode->i_ctime = current_time(inode);
1263                         inode_inc_iversion(inode);
1264                         inode->i_generation = generation;
1265                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1266                 }
1267                 ext4_journal_stop(handle);
1268
1269 unlock_out:
1270                 inode_unlock(inode);
1271 setversion_out:
1272                 mnt_drop_write_file(filp);
1273                 return err;
1274         }
1275         case EXT4_IOC_GROUP_EXTEND: {
1276                 ext4_fsblk_t n_blocks_count;
1277                 int err, err2=0;
1278
1279                 err = ext4_resize_begin(sb);
1280                 if (err)
1281                         return err;
1282
1283                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1284                         err = -EFAULT;
1285                         goto group_extend_out;
1286                 }
1287
1288                 if (ext4_has_feature_bigalloc(sb)) {
1289                         ext4_msg(sb, KERN_ERR,
1290                                  "Online resizing not supported with bigalloc");
1291                         err = -EOPNOTSUPP;
1292                         goto group_extend_out;
1293                 }
1294
1295                 err = mnt_want_write_file(filp);
1296                 if (err)
1297                         goto group_extend_out;
1298
1299                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1300                 if (EXT4_SB(sb)->s_journal) {
1301                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1302                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1303                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1304                 }
1305                 if (err == 0)
1306                         err = err2;
1307                 mnt_drop_write_file(filp);
1308 group_extend_out:
1309                 err2 = ext4_resize_end(sb, false);
1310                 if (err == 0)
1311                         err = err2;
1312                 return err;
1313         }
1314
1315         case EXT4_IOC_MOVE_EXT: {
1316                 struct move_extent me;
1317                 struct fd donor;
1318                 int err;
1319
1320                 if (!(filp->f_mode & FMODE_READ) ||
1321                     !(filp->f_mode & FMODE_WRITE))
1322                         return -EBADF;
1323
1324                 if (copy_from_user(&me,
1325                         (struct move_extent __user *)arg, sizeof(me)))
1326                         return -EFAULT;
1327                 me.moved_len = 0;
1328
1329                 donor = fdget(me.donor_fd);
1330                 if (!donor.file)
1331                         return -EBADF;
1332
1333                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1334                         err = -EBADF;
1335                         goto mext_out;
1336                 }
1337
1338                 if (ext4_has_feature_bigalloc(sb)) {
1339                         ext4_msg(sb, KERN_ERR,
1340                                  "Online defrag not supported with bigalloc");
1341                         err = -EOPNOTSUPP;
1342                         goto mext_out;
1343                 } else if (IS_DAX(inode)) {
1344                         ext4_msg(sb, KERN_ERR,
1345                                  "Online defrag not supported with DAX");
1346                         err = -EOPNOTSUPP;
1347                         goto mext_out;
1348                 }
1349
1350                 err = mnt_want_write_file(filp);
1351                 if (err)
1352                         goto mext_out;
1353
1354                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1355                                         me.donor_start, me.len, &me.moved_len);
1356                 mnt_drop_write_file(filp);
1357
1358                 if (copy_to_user((struct move_extent __user *)arg,
1359                                  &me, sizeof(me)))
1360                         err = -EFAULT;
1361 mext_out:
1362                 fdput(donor);
1363                 return err;
1364         }
1365
1366         case EXT4_IOC_GROUP_ADD: {
1367                 struct ext4_new_group_data input;
1368
1369                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1370                                 sizeof(input)))
1371                         return -EFAULT;
1372
1373                 return ext4_ioctl_group_add(filp, &input);
1374         }
1375
1376         case EXT4_IOC_MIGRATE:
1377         {
1378                 int err;
1379                 if (!inode_owner_or_capable(mnt_userns, inode))
1380                         return -EACCES;
1381
1382                 err = mnt_want_write_file(filp);
1383                 if (err)
1384                         return err;
1385                 /*
1386                  * inode_mutex prevent write and truncate on the file.
1387                  * Read still goes through. We take i_data_sem in
1388                  * ext4_ext_swap_inode_data before we switch the
1389                  * inode format to prevent read.
1390                  */
1391                 inode_lock((inode));
1392                 err = ext4_ext_migrate(inode);
1393                 inode_unlock((inode));
1394                 mnt_drop_write_file(filp);
1395                 return err;
1396         }
1397
1398         case EXT4_IOC_ALLOC_DA_BLKS:
1399         {
1400                 int err;
1401                 if (!inode_owner_or_capable(mnt_userns, inode))
1402                         return -EACCES;
1403
1404                 err = mnt_want_write_file(filp);
1405                 if (err)
1406                         return err;
1407                 err = ext4_alloc_da_blocks(inode);
1408                 mnt_drop_write_file(filp);
1409                 return err;
1410         }
1411
1412         case EXT4_IOC_SWAP_BOOT:
1413         {
1414                 int err;
1415                 if (!(filp->f_mode & FMODE_WRITE))
1416                         return -EBADF;
1417                 err = mnt_want_write_file(filp);
1418                 if (err)
1419                         return err;
1420                 err = swap_inode_boot_loader(sb, mnt_userns, inode);
1421                 mnt_drop_write_file(filp);
1422                 return err;
1423         }
1424
1425         case EXT4_IOC_RESIZE_FS: {
1426                 ext4_fsblk_t n_blocks_count;
1427                 int err = 0, err2 = 0;
1428                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1429
1430                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1431                                    sizeof(__u64))) {
1432                         return -EFAULT;
1433                 }
1434
1435                 err = ext4_resize_begin(sb);
1436                 if (err)
1437                         return err;
1438
1439                 err = mnt_want_write_file(filp);
1440                 if (err)
1441                         goto resizefs_out;
1442
1443                 err = ext4_resize_fs(sb, n_blocks_count);
1444                 if (EXT4_SB(sb)->s_journal) {
1445                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1446                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1447                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1448                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1449                 }
1450                 if (err == 0)
1451                         err = err2;
1452                 mnt_drop_write_file(filp);
1453                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1454                     ext4_has_group_desc_csum(sb) &&
1455                     test_opt(sb, INIT_INODE_TABLE))
1456                         err = ext4_register_li_request(sb, o_group);
1457
1458 resizefs_out:
1459                 err2 = ext4_resize_end(sb, true);
1460                 if (err == 0)
1461                         err = err2;
1462                 return err;
1463         }
1464
1465         case FITRIM:
1466         {
1467                 struct fstrim_range range;
1468                 int ret = 0;
1469
1470                 if (!capable(CAP_SYS_ADMIN))
1471                         return -EPERM;
1472
1473                 if (!bdev_max_discard_sectors(sb->s_bdev))
1474                         return -EOPNOTSUPP;
1475
1476                 /*
1477                  * We haven't replayed the journal, so we cannot use our
1478                  * block-bitmap-guided storage zapping commands.
1479                  */
1480                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1481                         return -EROFS;
1482
1483                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1484                     sizeof(range)))
1485                         return -EFAULT;
1486
1487                 ret = ext4_trim_fs(sb, &range);
1488                 if (ret < 0)
1489                         return ret;
1490
1491                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1492                     sizeof(range)))
1493                         return -EFAULT;
1494
1495                 return 0;
1496         }
1497         case EXT4_IOC_PRECACHE_EXTENTS:
1498                 return ext4_ext_precache(inode);
1499
1500         case FS_IOC_SET_ENCRYPTION_POLICY:
1501                 if (!ext4_has_feature_encrypt(sb))
1502                         return -EOPNOTSUPP;
1503                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1504
1505         case FS_IOC_GET_ENCRYPTION_PWSALT:
1506                 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1507
1508         case FS_IOC_GET_ENCRYPTION_POLICY:
1509                 if (!ext4_has_feature_encrypt(sb))
1510                         return -EOPNOTSUPP;
1511                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1512
1513         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1514                 if (!ext4_has_feature_encrypt(sb))
1515                         return -EOPNOTSUPP;
1516                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1517
1518         case FS_IOC_ADD_ENCRYPTION_KEY:
1519                 if (!ext4_has_feature_encrypt(sb))
1520                         return -EOPNOTSUPP;
1521                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1522
1523         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1524                 if (!ext4_has_feature_encrypt(sb))
1525                         return -EOPNOTSUPP;
1526                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1527
1528         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1529                 if (!ext4_has_feature_encrypt(sb))
1530                         return -EOPNOTSUPP;
1531                 return fscrypt_ioctl_remove_key_all_users(filp,
1532                                                           (void __user *)arg);
1533         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1534                 if (!ext4_has_feature_encrypt(sb))
1535                         return -EOPNOTSUPP;
1536                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1537
1538         case FS_IOC_GET_ENCRYPTION_NONCE:
1539                 if (!ext4_has_feature_encrypt(sb))
1540                         return -EOPNOTSUPP;
1541                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1542
1543         case EXT4_IOC_CLEAR_ES_CACHE:
1544         {
1545                 if (!inode_owner_or_capable(mnt_userns, inode))
1546                         return -EACCES;
1547                 ext4_clear_inode_es(inode);
1548                 return 0;
1549         }
1550
1551         case EXT4_IOC_GETSTATE:
1552         {
1553                 __u32   state = 0;
1554
1555                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1556                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1557                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1558                         state |= EXT4_STATE_FLAG_NEW;
1559                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1560                         state |= EXT4_STATE_FLAG_NEWENTRY;
1561                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1562                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1563
1564                 return put_user(state, (__u32 __user *) arg);
1565         }
1566
1567         case EXT4_IOC_GET_ES_CACHE:
1568                 return ext4_ioctl_get_es_cache(filp, arg);
1569
1570         case EXT4_IOC_SHUTDOWN:
1571                 return ext4_shutdown(sb, arg);
1572
1573         case FS_IOC_ENABLE_VERITY:
1574                 if (!ext4_has_feature_verity(sb))
1575                         return -EOPNOTSUPP;
1576                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1577
1578         case FS_IOC_MEASURE_VERITY:
1579                 if (!ext4_has_feature_verity(sb))
1580                         return -EOPNOTSUPP;
1581                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1582
1583         case FS_IOC_READ_VERITY_METADATA:
1584                 if (!ext4_has_feature_verity(sb))
1585                         return -EOPNOTSUPP;
1586                 return fsverity_ioctl_read_metadata(filp,
1587                                                     (const void __user *)arg);
1588
1589         case EXT4_IOC_CHECKPOINT:
1590                 return ext4_ioctl_checkpoint(filp, arg);
1591
1592         case FS_IOC_GETFSLABEL:
1593                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1594
1595         case FS_IOC_SETFSLABEL:
1596                 return ext4_ioctl_setlabel(filp,
1597                                            (const void __user *)arg);
1598
1599         case EXT4_IOC_GETFSUUID:
1600                 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1601         case EXT4_IOC_SETFSUUID:
1602                 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1603         default:
1604                 return -ENOTTY;
1605         }
1606 }
1607
1608 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1609 {
1610         return __ext4_ioctl(filp, cmd, arg);
1611 }
1612
1613 #ifdef CONFIG_COMPAT
1614 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1615 {
1616         /* These are just misnamed, they actually get/put from/to user an int */
1617         switch (cmd) {
1618         case EXT4_IOC32_GETVERSION:
1619                 cmd = EXT4_IOC_GETVERSION;
1620                 break;
1621         case EXT4_IOC32_SETVERSION:
1622                 cmd = EXT4_IOC_SETVERSION;
1623                 break;
1624         case EXT4_IOC32_GROUP_EXTEND:
1625                 cmd = EXT4_IOC_GROUP_EXTEND;
1626                 break;
1627         case EXT4_IOC32_GETVERSION_OLD:
1628                 cmd = EXT4_IOC_GETVERSION_OLD;
1629                 break;
1630         case EXT4_IOC32_SETVERSION_OLD:
1631                 cmd = EXT4_IOC_SETVERSION_OLD;
1632                 break;
1633         case EXT4_IOC32_GETRSVSZ:
1634                 cmd = EXT4_IOC_GETRSVSZ;
1635                 break;
1636         case EXT4_IOC32_SETRSVSZ:
1637                 cmd = EXT4_IOC_SETRSVSZ;
1638                 break;
1639         case EXT4_IOC32_GROUP_ADD: {
1640                 struct compat_ext4_new_group_input __user *uinput;
1641                 struct ext4_new_group_data input;
1642                 int err;
1643
1644                 uinput = compat_ptr(arg);
1645                 err = get_user(input.group, &uinput->group);
1646                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1647                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1648                 err |= get_user(input.inode_table, &uinput->inode_table);
1649                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1650                 err |= get_user(input.reserved_blocks,
1651                                 &uinput->reserved_blocks);
1652                 if (err)
1653                         return -EFAULT;
1654                 return ext4_ioctl_group_add(file, &input);
1655         }
1656         case EXT4_IOC_MOVE_EXT:
1657         case EXT4_IOC_RESIZE_FS:
1658         case FITRIM:
1659         case EXT4_IOC_PRECACHE_EXTENTS:
1660         case FS_IOC_SET_ENCRYPTION_POLICY:
1661         case FS_IOC_GET_ENCRYPTION_PWSALT:
1662         case FS_IOC_GET_ENCRYPTION_POLICY:
1663         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1664         case FS_IOC_ADD_ENCRYPTION_KEY:
1665         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1666         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1667         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1668         case FS_IOC_GET_ENCRYPTION_NONCE:
1669         case EXT4_IOC_SHUTDOWN:
1670         case FS_IOC_GETFSMAP:
1671         case FS_IOC_ENABLE_VERITY:
1672         case FS_IOC_MEASURE_VERITY:
1673         case FS_IOC_READ_VERITY_METADATA:
1674         case EXT4_IOC_CLEAR_ES_CACHE:
1675         case EXT4_IOC_GETSTATE:
1676         case EXT4_IOC_GET_ES_CACHE:
1677         case EXT4_IOC_CHECKPOINT:
1678         case FS_IOC_GETFSLABEL:
1679         case FS_IOC_SETFSLABEL:
1680         case EXT4_IOC_GETFSUUID:
1681         case EXT4_IOC_SETFSUUID:
1682                 break;
1683         default:
1684                 return -ENOIOCTLCMD;
1685         }
1686         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1687 }
1688 #endif
1689
1690 static void set_overhead(struct ext4_super_block *es, const void *arg)
1691 {
1692         es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1693 }
1694
1695 int ext4_update_overhead(struct super_block *sb, bool force)
1696 {
1697         struct ext4_sb_info *sbi = EXT4_SB(sb);
1698
1699         if (sb_rdonly(sb))
1700                 return 0;
1701         if (!force &&
1702             (sbi->s_overhead == 0 ||
1703              sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1704                 return 0;
1705         return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1706 }