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\n", sb_block);
 149                 unlock_buffer(bh);
 150                 err = -EFSBADCRC;
 151                 goto out_bh;
 152         }
 153         func(es, arg);
 154         if (ext4_has_metadata_csum(sb))
 155                 es->s_checksum = ext4_superblock_csum(sb, es);
 156         set_buffer_uptodate(bh);
 157         unlock_buffer(bh);
 158
 159         if (err)
 160                 goto out_bh;
 161
 162         if (handle) {
 163                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
 164                 if (err)
 165                         goto out_bh;
 166         } else {
 167                 BUFFER_TRACE(bh, "marking dirty");
 168                 mark_buffer_dirty(bh);
 169         }
 170         err = sync_dirty_buffer(bh);
 171
 172 out_bh:
 173         brelse(bh);
 174         ext4_std_error(sb, err);
 175         return (err) ? err : 1;
 176 }
 177
 178 /*
 179  * Update primary and backup superblocks using the provided function
 180  * func and argument arg.
 181  *
 182  * Only the primary superblock and at most two backup superblock
 183  * modifications are journalled; the rest is modified without journal.
 184  * This is safe because e2fsck will re-write them if there is a problem,
 185  * and we're very unlikely to ever need more than two backups.
 186  */
 187 static
 188 int ext4_update_superblocks_fn(struct super_block *sb,
 189                                ext4_update_sb_callback func,
 190                                const void *arg)
 191 {
 192         handle_t *handle;
 193         ext4_group_t ngroups;
 194         unsigned int three = 1;
 195         unsigned int five = 5;
 196         unsigned int seven = 7;
 197         int err = 0, ret, i;
 198         ext4_group_t grp, primary_grp;
 199         struct ext4_sb_info *sbi = EXT4_SB(sb);
 200
 201         /*
 202          * We can't update superblocks while the online resize is running
 203          */
 204         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 205                                   &sbi->s_ext4_flags)) {
 206                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
 207                          "performing online resize");
 208                 return -EBUSY;
 209         }
 210
 211         /*
 212          * We're only going to update primary superblock and two
 213          * backup superblocks in this transaction.
 214          */
 215         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
 216         if (IS_ERR(handle)) {
 217                 err = PTR_ERR(handle);
 218                 goto out;
 219         }
 220
 221         /* Update primary superblock */
 222         err = ext4_update_primary_sb(sb, handle, func, arg);
 223         if (err) {
 224                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
 225                          "superblock");
 226                 goto out_journal;
 227         }
 228
 229         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
 230         ngroups = ext4_get_groups_count(sb);
 231
 232         /*
 233          * Update backup superblocks. We have to start from group 0
 234          * because it might not be where the primary superblock is
 235          * if the fs is mounted with -o sb=<backup_sb_block>
 236          */
 237         i = 0;
 238         grp = 0;
 239         while (grp < ngroups) {
 240                 /* Skip primary superblock */
 241                 if (grp == primary_grp)
 242                         goto next_grp;
 243
 244                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
 245                 if (ret < 0) {
 246                         /* Ignore bad checksum; try to update next sb */
 247                         if (ret == -EFSBADCRC)
 248                                 goto next_grp;
 249                         err = ret;
 250                         goto out_journal;
 251                 }
 252
 253                 i += ret;
 254                 if (handle && i > 1) {
 255                         /*
 256                          * We're only journalling primary superblock and
 257                          * two backup superblocks; the rest is not
 258                          * journalled.
 259                          */
 260                         err = ext4_journal_stop(handle);
 261                         if (err)
 262                                 goto out;
 263                         handle = NULL;
 264                 }
 265 next_grp:
 266                 grp = ext4_list_backups(sb, &three, &five, &seven);
 267         }
 268
 269 out_journal:
 270         if (handle) {
 271                 ret = ext4_journal_stop(handle);
 272                 if (ret && !err)
 273                         err = ret;
 274         }
 275 out:
 276         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
 277         smp_mb__after_atomic();
 278         return err ? err : 0;
 279 }
 280
 281 /*
 282  * Swap memory between @a and @b for @len bytes.
 283  *
 284  * @a:          pointer to first memory area
 285  * @b:          pointer to second memory area
 286  * @len:        number of bytes to swap
 287  *
 288  */
 289 static void memswap(void *a, void *b, size_t len)
 290 {
 291         unsigned char *ap, *bp;
 292
 293         ap = (unsigned char *)a;
 294         bp = (unsigned char *)b;
 295         while (len-- > 0) {
 296                 swap(*ap, *bp);
 297                 ap++;
 298                 bp++;
 299         }
 300 }
 301
 302 /*
 303  * Swap i_data and associated attributes between @inode1 and @inode2.
 304  * This function is used for the primary swap between inode1 and inode2
 305  * and also to revert this primary swap in case of errors.
 306  *
 307  * Therefore you have to make sure, that calling this method twice
 308  * will revert all changes.
 309  *
 310  * @inode1:     pointer to first inode
 311  * @inode2:     pointer to second inode
 312  */
 313 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 314 {
 315         loff_t isize;
 316         struct ext4_inode_info *ei1;
 317         struct ext4_inode_info *ei2;
 318         unsigned long tmp;
 319
 320         ei1 = EXT4_I(inode1);
 321         ei2 = EXT4_I(inode2);
 322
 323         swap(inode1->i_version, inode2->i_version);
 324         swap(inode1->i_atime, inode2->i_atime);
 325         swap(inode1->i_mtime, inode2->i_mtime);
 326
 327         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 328         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 329         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 330                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 331         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 332         swap(ei1->i_disksize, ei2->i_disksize);
 333         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 334         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 335
 336         isize = i_size_read(inode1);
 337         i_size_write(inode1, i_size_read(inode2));
 338         i_size_write(inode2, isize);
 339 }
 340
 341 void ext4_reset_inode_seed(struct inode *inode)
 342 {
 343         struct ext4_inode_info *ei = EXT4_I(inode);
 344         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 345         __le32 inum = cpu_to_le32(inode->i_ino);
 346         __le32 gen = cpu_to_le32(inode->i_generation);
 347         __u32 csum;
 348
 349         if (!ext4_has_metadata_csum(inode->i_sb))
 350                 return;
 351
 352         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 353         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 354 }
 355
 356 /*
 357  * Swap the information from the given @inode and the inode
 358  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 359  * important fields of the inodes.
 360  *
 361  * @sb:         the super block of the filesystem
 362  * @mnt_userns: user namespace of the mount the inode was found from
 363  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 364  *
 365  */
 366 static long swap_inode_boot_loader(struct super_block *sb,
 367                                 struct user_namespace *mnt_userns,
 368                                 struct inode *inode)
 369 {
 370         handle_t *handle;
 371         int err;
 372         struct inode *inode_bl;
 373         struct ext4_inode_info *ei_bl;
 374         qsize_t size, size_bl, diff;
 375         blkcnt_t blocks;
 376         unsigned short bytes;
 377
 378         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 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 (inode_bl->i_nlink == 0) {
 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
 456         inode->i_generation = prandom_u32();
 457         inode_bl->i_generation = prandom_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
 669         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 670 flags_err:
 671         ext4_journal_stop(handle);
 672         if (err)
 673                 goto flags_out;
 674
 675         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 676                 /*
 677                  * Changes to the journaling mode can cause unsafe changes to
 678                  * S_DAX if the inode is DAX
 679                  */
 680                 if (IS_DAX(inode)) {
 681                         err = -EBUSY;
 682                         goto flags_out;
 683                 }
 684
 685                 err = ext4_change_inode_journal_flag(inode,
 686                                                      flags & EXT4_JOURNAL_DATA_FL);
 687                 if (err)
 688                         goto flags_out;
 689         }
 690         if (migrate) {
 691                 if (flags & EXT4_EXTENTS_FL)
 692                         err = ext4_ext_migrate(inode);
 693                 else
 694                         err = ext4_ind_migrate(inode);
 695         }
 696
 697 flags_out:
 698         return err;
 699 }
 700
 701 #ifdef CONFIG_QUOTA
 702 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 703 {
 704         struct super_block *sb = inode->i_sb;
 705         struct ext4_inode_info *ei = EXT4_I(inode);
 706         int err, rc;
 707         handle_t *handle;
 708         kprojid_t kprojid;
 709         struct ext4_iloc iloc;
 710         struct ext4_inode *raw_inode;
 711         struct dquot *transfer_to[MAXQUOTAS] = { };
 712
 713         if (!ext4_has_feature_project(sb)) {
 714                 if (projid != EXT4_DEF_PROJID)
 715                         return -EOPNOTSUPP;
 716                 else
 717                         return 0;
 718         }
 719
 720         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 721                 return -EOPNOTSUPP;
 722
 723         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 724
 725         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 726                 return 0;
 727
 728         err = -EPERM;
 729         /* Is it quota file? Do not allow user to mess with it */
 730         if (ext4_is_quota_file(inode))
 731                 return err;
 732
 733         err = ext4_get_inode_loc(inode, &iloc);
 734         if (err)
 735                 return err;
 736
 737         raw_inode = ext4_raw_inode(&iloc);
 738         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 739                 err = ext4_expand_extra_isize(inode,
 740                                               EXT4_SB(sb)->s_want_extra_isize,
 741                                               &iloc);
 742                 if (err)
 743                         return err;
 744         } else {
 745                 brelse(iloc.bh);
 746         }
 747
 748         err = dquot_initialize(inode);
 749         if (err)
 750                 return err;
 751
 752         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 753                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 754                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 755         if (IS_ERR(handle))
 756                 return PTR_ERR(handle);
 757
 758         err = ext4_reserve_inode_write(handle, inode, &iloc);
 759         if (err)
 760                 goto out_stop;
 761
 762         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 763         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 764
 765                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 766                  * counts xattr inode references.
 767                  */
 768                 down_read(&EXT4_I(inode)->xattr_sem);
 769                 err = __dquot_transfer(inode, transfer_to);
 770                 up_read(&EXT4_I(inode)->xattr_sem);
 771                 dqput(transfer_to[PRJQUOTA]);
 772                 if (err)
 773                         goto out_dirty;
 774         }
 775
 776         EXT4_I(inode)->i_projid = kprojid;
 777         inode->i_ctime = current_time(inode);
 778 out_dirty:
 779         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 780         if (!err)
 781                 err = rc;
 782 out_stop:
 783         ext4_journal_stop(handle);
 784         return err;
 785 }
 786 #else
 787 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 788 {
 789         if (projid != EXT4_DEF_PROJID)
 790                 return -EOPNOTSUPP;
 791         return 0;
 792 }
 793 #endif
 794
 795 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 796 {
 797         struct ext4_sb_info *sbi = EXT4_SB(sb);
 798         __u32 flags;
 799
 800         if (!capable(CAP_SYS_ADMIN))
 801                 return -EPERM;
 802
 803         if (get_user(flags, (__u32 __user *)arg))
 804                 return -EFAULT;
 805
 806         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 807                 return -EINVAL;
 808
 809         if (ext4_forced_shutdown(sbi))
 810                 return 0;
 811
 812         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 813         trace_ext4_shutdown(sb, flags);
 814
 815         switch (flags) {
 816         case EXT4_GOING_FLAGS_DEFAULT:
 817                 freeze_bdev(sb->s_bdev);
 818                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 819                 thaw_bdev(sb->s_bdev);
 820                 break;
 821         case EXT4_GOING_FLAGS_LOGFLUSH:
 822                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 823                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 824                         (void) ext4_force_commit(sb);
 825                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 826                 }
 827                 break;
 828         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 829                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 830                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 831                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 832                 break;
 833         default:
 834                 return -EINVAL;
 835         }
 836         clear_opt(sb, DISCARD);
 837         return 0;
 838 }
 839
 840 struct getfsmap_info {
 841         struct super_block      *gi_sb;
 842         struct fsmap_head __user *gi_data;
 843         unsigned int            gi_idx;
 844         __u32                   gi_last_flags;
 845 };
 846
 847 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 848 {
 849         struct getfsmap_info *info = priv;
 850         struct fsmap fm;
 851
 852         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 853
 854         info->gi_last_flags = xfm->fmr_flags;
 855         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 856         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 857                         sizeof(struct fsmap)))
 858                 return -EFAULT;
 859
 860         return 0;
 861 }
 862
 863 static int ext4_ioc_getfsmap(struct super_block *sb,
 864                              struct fsmap_head __user *arg)
 865 {
 866         struct getfsmap_info info = { NULL };
 867         struct ext4_fsmap_head xhead = {0};
 868         struct fsmap_head head;
 869         bool aborted = false;
 870         int error;
 871
 872         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 873                 return -EFAULT;
 874         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 875             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 876                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 877             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 878                        sizeof(head.fmh_keys[1].fmr_reserved)))
 879                 return -EINVAL;
 880         /*
 881          * ext4 doesn't report file extents at all, so the only valid
 882          * file offsets are the magic ones (all zeroes or all ones).
 883          */
 884         if (head.fmh_keys[0].fmr_offset ||
 885             (head.fmh_keys[1].fmr_offset != 0 &&
 886              head.fmh_keys[1].fmr_offset != -1ULL))
 887                 return -EINVAL;
 888
 889         xhead.fmh_iflags = head.fmh_iflags;
 890         xhead.fmh_count = head.fmh_count;
 891         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 892         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 893
 894         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 895         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 896
 897         info.gi_sb = sb;
 898         info.gi_data = arg;
 899         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 900         if (error == EXT4_QUERY_RANGE_ABORT)
 901                 aborted = true;
 902         else if (error)
 903                 return error;
 904
 905         /* If we didn't abort, set the "last" flag in the last fmx */
 906         if (!aborted && info.gi_idx) {
 907                 info.gi_last_flags |= FMR_OF_LAST;
 908                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 909                                  &info.gi_last_flags,
 910                                  sizeof(info.gi_last_flags)))
 911                         return -EFAULT;
 912         }
 913
 914         /* copy back header */
 915         head.fmh_entries = xhead.fmh_entries;
 916         head.fmh_oflags = xhead.fmh_oflags;
 917         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 918                 return -EFAULT;
 919
 920         return 0;
 921 }
 922
 923 static long ext4_ioctl_group_add(struct file *file,
 924                                  struct ext4_new_group_data *input)
 925 {
 926         struct super_block *sb = file_inode(file)->i_sb;
 927         int err, err2=0;
 928
 929         err = ext4_resize_begin(sb);
 930         if (err)
 931                 return err;
 932
 933         if (ext4_has_feature_bigalloc(sb)) {
 934                 ext4_msg(sb, KERN_ERR,
 935                          "Online resizing not supported with bigalloc");
 936                 err = -EOPNOTSUPP;
 937                 goto group_add_out;
 938         }
 939
 940         err = mnt_want_write_file(file);
 941         if (err)
 942                 goto group_add_out;
 943
 944         err = ext4_group_add(sb, input);
 945         if (EXT4_SB(sb)->s_journal) {
 946                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 947                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 948                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 949         }
 950         if (err == 0)
 951                 err = err2;
 952         mnt_drop_write_file(file);
 953         if (!err && ext4_has_group_desc_csum(sb) &&
 954             test_opt(sb, INIT_INODE_TABLE))
 955                 err = ext4_register_li_request(sb, input->group);
 956 group_add_out:
 957         err2 = ext4_resize_end(sb, false);
 958         if (err == 0)
 959                 err = err2;
 960         return err;
 961 }
 962
 963 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 964 {
 965         struct inode *inode = d_inode(dentry);
 966         struct ext4_inode_info *ei = EXT4_I(inode);
 967         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 968
 969         if (S_ISREG(inode->i_mode))
 970                 flags &= ~FS_PROJINHERIT_FL;
 971
 972         fileattr_fill_flags(fa, flags);
 973         if (ext4_has_feature_project(inode->i_sb))
 974                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 975
 976         return 0;
 977 }
 978
 979 int ext4_fileattr_set(struct user_namespace *mnt_userns,
 980                       struct dentry *dentry, struct fileattr *fa)
 981 {
 982         struct inode *inode = d_inode(dentry);
 983         u32 flags = fa->flags;
 984         int err = -EOPNOTSUPP;
 985
 986         if (flags & ~EXT4_FL_USER_VISIBLE)
 987                 goto out;
 988
 989         /*
 990          * chattr(1) grabs flags via GETFLAGS, modifies the result and
 991          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 992          * more restrictive than just silently masking off visible but
 993          * not settable flags as we always did.
 994          */
 995         flags &= EXT4_FL_USER_MODIFIABLE;
 996         if (ext4_mask_flags(inode->i_mode, flags) != flags)
 997                 goto out;
 998         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
 999         if (err)
1000                 goto out;
1001         err = ext4_ioctl_setflags(inode, flags);
1002         if (err)
1003                 goto out;
1004         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1005 out:
1006         return err;
1007 }
1008
1009 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1010 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1011
1012 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1013 {
1014         struct fiemap fiemap;
1015         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1016         struct fiemap_extent_info fieinfo = { 0, };
1017         struct inode *inode = file_inode(filp);
1018         int error;
1019
1020         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1021                 return -EFAULT;
1022
1023         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1024                 return -EINVAL;
1025
1026         fieinfo.fi_flags = fiemap.fm_flags;
1027         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1028         fieinfo.fi_extents_start = ufiemap->fm_extents;
1029
1030         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1031                         fiemap.fm_length);
1032         fiemap.fm_flags = fieinfo.fi_flags;
1033         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1034         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1035                 error = -EFAULT;
1036
1037         return error;
1038 }
1039
1040 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1041 {
1042         int err = 0;
1043         __u32 flags = 0;
1044         unsigned int flush_flags = 0;
1045         struct super_block *sb = file_inode(filp)->i_sb;
1046
1047         if (copy_from_user(&flags, (__u32 __user *)arg,
1048                                 sizeof(__u32)))
1049                 return -EFAULT;
1050
1051         if (!capable(CAP_SYS_ADMIN))
1052                 return -EPERM;
1053
1054         /* check for invalid bits set */
1055         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1056                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1057                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1058                 return -EINVAL;
1059
1060         if (!EXT4_SB(sb)->s_journal)
1061                 return -ENODEV;
1062
1063         if (flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID)
1064                 return -EINVAL;
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, &fsuuid, sizeof(fsuuid.fsu_len)))
1158                         return -EFAULT;
1159                 return -EINVAL;
1160         }
1161
1162         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1163                 return -EINVAL;
1164
1165         lock_buffer(sbi->s_sbh);
1166         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1167         unlock_buffer(sbi->s_sbh);
1168
1169         if (copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1170                 return -EFAULT;
1171         return 0;
1172 }
1173
1174 static int ext4_ioctl_setuuid(struct file *filp,
1175                         const struct fsuuid __user *ufsuuid)
1176 {
1177         int ret = 0;
1178         struct super_block *sb = file_inode(filp)->i_sb;
1179         struct fsuuid fsuuid;
1180         __u8 uuid[UUID_SIZE];
1181
1182         if (!capable(CAP_SYS_ADMIN))
1183                 return -EPERM;
1184
1185         /*
1186          * If any checksums (group descriptors or metadata) are being used
1187          * then the checksum seed feature is required to change the UUID.
1188          */
1189         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1190                         && !ext4_has_feature_csum_seed(sb))
1191                 || ext4_has_feature_stable_inodes(sb))
1192                 return -EOPNOTSUPP;
1193
1194         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1195                 return -EFAULT;
1196
1197         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1198                 return -EINVAL;
1199
1200         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1201                 return -EFAULT;
1202
1203         ret = mnt_want_write_file(filp);
1204         if (ret)
1205                 return ret;
1206
1207         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1208         mnt_drop_write_file(filp);
1209
1210         return ret;
1211 }
1212
1213 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1214 {
1215         struct inode *inode = file_inode(filp);
1216         struct super_block *sb = inode->i_sb;
1217         struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
1218
1219         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1220
1221         switch (cmd) {
1222         case FS_IOC_GETFSMAP:
1223                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1224         case EXT4_IOC_GETVERSION:
1225         case EXT4_IOC_GETVERSION_OLD:
1226                 return put_user(inode->i_generation, (int __user *) arg);
1227         case EXT4_IOC_SETVERSION:
1228         case EXT4_IOC_SETVERSION_OLD: {
1229                 handle_t *handle;
1230                 struct ext4_iloc iloc;
1231                 __u32 generation;
1232                 int err;
1233
1234                 if (!inode_owner_or_capable(mnt_userns, inode))
1235                         return -EPERM;
1236
1237                 if (ext4_has_metadata_csum(inode->i_sb)) {
1238                         ext4_warning(sb, "Setting inode version is not "
1239                                      "supported with metadata_csum enabled.");
1240                         return -ENOTTY;
1241                 }
1242
1243                 err = mnt_want_write_file(filp);
1244                 if (err)
1245                         return err;
1246                 if (get_user(generation, (int __user *) arg)) {
1247                         err = -EFAULT;
1248                         goto setversion_out;
1249                 }
1250
1251                 inode_lock(inode);
1252                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1253                 if (IS_ERR(handle)) {
1254                         err = PTR_ERR(handle);
1255                         goto unlock_out;
1256                 }
1257                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1258                 if (err == 0) {
1259                         inode->i_ctime = current_time(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 }