fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/delay.h>
  21 #include <linux/iversion.h>
  22 #include <linux/fileattr.h>
  23 #include <linux/uuid.h>
  24 #include "ext4_jbd2.h"
  25 #include "ext4.h"
  26 #include <linux/fsmap.h>
  27 #include "fsmap.h"
  28 #include <trace/events/ext4.h>
  29
  30 typedef void ext4_update_sb_callback(struct ext4_super_block *es,
  31                                        const void *arg);
  32
  33 /*
  34  * Superblock modification callback function for changing file system
  35  * label
  36  */
  37 static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg)
  38 {
  39         /* Sanity check, this should never happen */
  40         BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX);
  41
  42         memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX);
  43 }
  44
  45 /*
  46  * Superblock modification callback function for changing file system
  47  * UUID.
  48  */
  49 static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg)
  50 {
  51         memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE);
  52 }
  53
  54 static
  55 int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
  56                            ext4_update_sb_callback func,
  57                            const void *arg)
  58 {
  59         int err = 0;
  60         struct ext4_sb_info *sbi = EXT4_SB(sb);
  61         struct buffer_head *bh = sbi->s_sbh;
  62         struct ext4_super_block *es = sbi->s_es;
  63
  64         trace_ext4_update_sb(sb, bh->b_blocknr, 1);
  65
  66         BUFFER_TRACE(bh, "get_write_access");
  67         err = ext4_journal_get_write_access(handle, sb,
  68                                             bh,
  69                                             EXT4_JTR_NONE);
  70         if (err)
  71                 goto out_err;
  72
  73         lock_buffer(bh);
  74         func(es, arg);
  75         ext4_superblock_csum_set(sb);
  76         unlock_buffer(bh);
  77
  78         if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
  79                 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
  80                          "superblock detected");
  81                 clear_buffer_write_io_error(bh);
  82                 set_buffer_uptodate(bh);
  83         }
  84
  85         err = ext4_handle_dirty_metadata(handle, NULL, bh);
  86         if (err)
  87                 goto out_err;
  88         err = sync_dirty_buffer(bh);
  89 out_err:
  90         ext4_std_error(sb, err);
  91         return err;
  92 }
  93
  94 /*
  95  * Update one backup superblock in the group 'grp' using the callback
  96  * function 'func' and argument 'arg'. If the handle is NULL the
  97  * modification is not journalled.
  98  *
  99  * Returns: 0 when no modification was done (no superblock in the group)
 100  *          1 when the modification was successful
 101  *         <0 on error
 102  */
 103 static int ext4_update_backup_sb(struct super_block *sb,
 104                                  handle_t *handle, ext4_group_t grp,
 105                                  ext4_update_sb_callback func, const void *arg)
 106 {
 107         int err = 0;
 108         ext4_fsblk_t sb_block;
 109         struct buffer_head *bh;
 110         unsigned long offset = 0;
 111         struct ext4_super_block *es;
 112
 113         if (!ext4_bg_has_super(sb, grp))
 114                 return 0;
 115
 116         /*
 117          * For the group 0 there is always 1k padding, so we have
 118          * either adjust offset, or sb_block depending on blocksize
 119          */
 120         if (grp == 0) {
 121                 sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
 122                 offset = do_div(sb_block, sb->s_blocksize);
 123         } else {
 124                 sb_block = ext4_group_first_block_no(sb, grp);
 125                 offset = 0;
 126         }
 127
 128         trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
 129
 130         bh = ext4_sb_bread(sb, sb_block, 0);
 131         if (IS_ERR(bh))
 132                 return PTR_ERR(bh);
 133
 134         if (handle) {
 135                 BUFFER_TRACE(bh, "get_write_access");
 136                 err = ext4_journal_get_write_access(handle, sb,
 137                                                     bh,
 138                                                     EXT4_JTR_NONE);
 139                 if (err)
 140                         goto out_bh;
 141         }
 142
 143         es = (struct ext4_super_block *) (bh->b_data + offset);
 144         lock_buffer(bh);
 145         if (ext4_has_metadata_csum(sb) &&
 146             es->s_checksum != ext4_superblock_csum(sb, es)) {
 147                 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
 148                 "superblock %llu", sb_block);
 149                 unlock_buffer(bh);
 150                 goto out_bh;
 151         }
 152         func(es, arg);
 153         if (ext4_has_metadata_csum(sb))
 154                 es->s_checksum = ext4_superblock_csum(sb, es);
 155         set_buffer_uptodate(bh);
 156         unlock_buffer(bh);
 157
 158         if (handle) {
 159                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
 160                 if (err)
 161                         goto out_bh;
 162         } else {
 163                 BUFFER_TRACE(bh, "marking dirty");
 164                 mark_buffer_dirty(bh);
 165         }
 166         err = sync_dirty_buffer(bh);
 167
 168 out_bh:
 169         brelse(bh);
 170         ext4_std_error(sb, err);
 171         return (err) ? err : 1;
 172 }
 173
 174 /*
 175  * Update primary and backup superblocks using the provided function
 176  * func and argument arg.
 177  *
 178  * Only the primary superblock and at most two backup superblock
 179  * modifications are journalled; the rest is modified without journal.
 180  * This is safe because e2fsck will re-write them if there is a problem,
 181  * and we're very unlikely to ever need more than two backups.
 182  */
 183 static
 184 int ext4_update_superblocks_fn(struct super_block *sb,
 185                                ext4_update_sb_callback func,
 186                                const void *arg)
 187 {
 188         handle_t *handle;
 189         ext4_group_t ngroups;
 190         unsigned int three = 1;
 191         unsigned int five = 5;
 192         unsigned int seven = 7;
 193         int err = 0, ret, i;
 194         ext4_group_t grp, primary_grp;
 195         struct ext4_sb_info *sbi = EXT4_SB(sb);
 196
 197         /*
 198          * We can't update superblocks while the online resize is running
 199          */
 200         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 201                                   &sbi->s_ext4_flags)) {
 202                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
 203                          "performing online resize");
 204                 return -EBUSY;
 205         }
 206
 207         /*
 208          * We're only going to update primary superblock and two
 209          * backup superblocks in this transaction.
 210          */
 211         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
 212         if (IS_ERR(handle)) {
 213                 err = PTR_ERR(handle);
 214                 goto out;
 215         }
 216
 217         /* Update primary superblock */
 218         err = ext4_update_primary_sb(sb, handle, func, arg);
 219         if (err) {
 220                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
 221                          "superblock");
 222                 goto out_journal;
 223         }
 224
 225         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
 226         ngroups = ext4_get_groups_count(sb);
 227
 228         /*
 229          * Update backup superblocks. We have to start from group 0
 230          * because it might not be where the primary superblock is
 231          * if the fs is mounted with -o sb=<backup_sb_block>
 232          */
 233         i = 0;
 234         grp = 0;
 235         while (grp < ngroups) {
 236                 /* Skip primary superblock */
 237                 if (grp == primary_grp)
 238                         goto next_grp;
 239
 240                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
 241                 if (ret < 0) {
 242                         /* Ignore bad checksum; try to update next sb */
 243                         if (ret == -EFSBADCRC)
 244                                 goto next_grp;
 245                         err = ret;
 246                         goto out_journal;
 247                 }
 248
 249                 i += ret;
 250                 if (handle && i > 1) {
 251                         /*
 252                          * We're only journalling primary superblock and
 253                          * two backup superblocks; the rest is not
 254                          * journalled.
 255                          */
 256                         err = ext4_journal_stop(handle);
 257                         if (err)
 258                                 goto out;
 259                         handle = NULL;
 260                 }
 261 next_grp:
 262                 grp = ext4_list_backups(sb, &three, &five, &seven);
 263         }
 264
 265 out_journal:
 266         if (handle) {
 267                 ret = ext4_journal_stop(handle);
 268                 if (ret && !err)
 269                         err = ret;
 270         }
 271 out:
 272         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
 273         smp_mb__after_atomic();
 274         return err ? err : 0;
 275 }
 276
 277 /*
 278  * Swap memory between @a and @b for @len bytes.
 279  *
 280  * @a:          pointer to first memory area
 281  * @b:          pointer to second memory area
 282  * @len:        number of bytes to swap
 283  *
 284  */
 285 static void memswap(void *a, void *b, size_t len)
 286 {
 287         unsigned char *ap, *bp;
 288
 289         ap = (unsigned char *)a;
 290         bp = (unsigned char *)b;
 291         while (len-- > 0) {
 292                 swap(*ap, *bp);
 293                 ap++;
 294                 bp++;
 295         }
 296 }
 297
 298 /*
 299  * Swap i_data and associated attributes between @inode1 and @inode2.
 300  * This function is used for the primary swap between inode1 and inode2
 301  * and also to revert this primary swap in case of errors.
 302  *
 303  * Therefore you have to make sure, that calling this method twice
 304  * will revert all changes.
 305  *
 306  * @inode1:     pointer to first inode
 307  * @inode2:     pointer to second inode
 308  */
 309 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 310 {
 311         loff_t isize;
 312         struct ext4_inode_info *ei1;
 313         struct ext4_inode_info *ei2;
 314         unsigned long tmp;
 315         struct timespec64 ts1, ts2;
 316
 317         ei1 = EXT4_I(inode1);
 318         ei2 = EXT4_I(inode2);
 319
 320         swap(inode1->i_version, inode2->i_version);
 321
 322         ts1 = inode_get_atime(inode1);
 323         ts2 = inode_get_atime(inode2);
 324         inode_set_atime_to_ts(inode1, ts2);
 325         inode_set_atime_to_ts(inode2, ts1);
 326
 327         ts1 = inode_get_mtime(inode1);
 328         ts2 = inode_get_mtime(inode2);
 329         inode_set_mtime_to_ts(inode1, ts2);
 330         inode_set_mtime_to_ts(inode2, ts1);
 331
 332         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 333         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 334         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 335                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 336         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 337         swap(ei1->i_disksize, ei2->i_disksize);
 338         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 339         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 340
 341         isize = i_size_read(inode1);
 342         i_size_write(inode1, i_size_read(inode2));
 343         i_size_write(inode2, isize);
 344 }
 345
 346 void ext4_reset_inode_seed(struct inode *inode)
 347 {
 348         struct ext4_inode_info *ei = EXT4_I(inode);
 349         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 350         __le32 inum = cpu_to_le32(inode->i_ino);
 351         __le32 gen = cpu_to_le32(inode->i_generation);
 352         __u32 csum;
 353
 354         if (!ext4_has_metadata_csum(inode->i_sb))
 355                 return;
 356
 357         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 358         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 359 }
 360
 361 /*
 362  * Swap the information from the given @inode and the inode
 363  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 364  * important fields of the inodes.
 365  *
 366  * @sb:         the super block of the filesystem
 367  * @idmap:      idmap of the mount the inode was found from
 368  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 369  *
 370  */
 371 static long swap_inode_boot_loader(struct super_block *sb,
 372                                 struct mnt_idmap *idmap,
 373                                 struct inode *inode)
 374 {
 375         handle_t *handle;
 376         int err;
 377         struct inode *inode_bl;
 378         struct ext4_inode_info *ei_bl;
 379         qsize_t size, size_bl, diff;
 380         blkcnt_t blocks;
 381         unsigned short bytes;
 382
 383         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO,
 384                         EXT4_IGET_SPECIAL | EXT4_IGET_BAD);
 385         if (IS_ERR(inode_bl))
 386                 return PTR_ERR(inode_bl);
 387         ei_bl = EXT4_I(inode_bl);
 388
 389         /* Protect orig inodes against a truncate and make sure,
 390          * that only 1 swap_inode_boot_loader is running. */
 391         lock_two_nondirectories(inode, inode_bl);
 392
 393         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 394             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 395             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 396             ext4_has_inline_data(inode)) {
 397                 err = -EINVAL;
 398                 goto journal_err_out;
 399         }
 400
 401         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 402             !inode_owner_or_capable(idmap, inode) ||
 403             !capable(CAP_SYS_ADMIN)) {
 404                 err = -EPERM;
 405                 goto journal_err_out;
 406         }
 407
 408         filemap_invalidate_lock(inode->i_mapping);
 409         err = filemap_write_and_wait(inode->i_mapping);
 410         if (err)
 411                 goto err_out;
 412
 413         err = filemap_write_and_wait(inode_bl->i_mapping);
 414         if (err)
 415                 goto err_out;
 416
 417         /* Wait for all existing dio workers */
 418         inode_dio_wait(inode);
 419         inode_dio_wait(inode_bl);
 420
 421         truncate_inode_pages(&inode->i_data, 0);
 422         truncate_inode_pages(&inode_bl->i_data, 0);
 423
 424         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 425         if (IS_ERR(handle)) {
 426                 err = -EINVAL;
 427                 goto err_out;
 428         }
 429         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
 430
 431         /* Protect extent tree against block allocations via delalloc */
 432         ext4_double_down_write_data_sem(inode, inode_bl);
 433
 434         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
 435                 /* this inode has never been used as a BOOT_LOADER */
 436                 set_nlink(inode_bl, 1);
 437                 i_uid_write(inode_bl, 0);
 438                 i_gid_write(inode_bl, 0);
 439                 inode_bl->i_flags = 0;
 440                 ei_bl->i_flags = 0;
 441                 inode_set_iversion(inode_bl, 1);
 442                 i_size_write(inode_bl, 0);
 443                 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size;
 444                 inode_bl->i_mode = S_IFREG;
 445                 if (ext4_has_feature_extents(sb)) {
 446                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 447                         ext4_ext_tree_init(handle, inode_bl);
 448                 } else
 449                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 450         }
 451
 452         err = dquot_initialize(inode);
 453         if (err)
 454                 goto err_out1;
 455
 456         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 457         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 458         diff = size - size_bl;
 459         swap_inode_data(inode, inode_bl);
 460
 461         inode_set_ctime_current(inode);
 462         inode_set_ctime_current(inode_bl);
 463         inode_inc_iversion(inode);
 464
 465         inode->i_generation = get_random_u32();
 466         inode_bl->i_generation = get_random_u32();
 467         ext4_reset_inode_seed(inode);
 468         ext4_reset_inode_seed(inode_bl);
 469
 470         ext4_discard_preallocations(inode);
 471
 472         err = ext4_mark_inode_dirty(handle, inode);
 473         if (err < 0) {
 474                 /* No need to update quota information. */
 475                 ext4_warning(inode->i_sb,
 476                         "couldn't mark inode #%lu dirty (err %d)",
 477                         inode->i_ino, err);
 478                 /* Revert all changes: */
 479                 swap_inode_data(inode, inode_bl);
 480                 ext4_mark_inode_dirty(handle, inode);
 481                 goto err_out1;
 482         }
 483
 484         blocks = inode_bl->i_blocks;
 485         bytes = inode_bl->i_bytes;
 486         inode_bl->i_blocks = inode->i_blocks;
 487         inode_bl->i_bytes = inode->i_bytes;
 488         err = ext4_mark_inode_dirty(handle, inode_bl);
 489         if (err < 0) {
 490                 /* No need to update quota information. */
 491                 ext4_warning(inode_bl->i_sb,
 492                         "couldn't mark inode #%lu dirty (err %d)",
 493                         inode_bl->i_ino, err);
 494                 goto revert;
 495         }
 496
 497         /* Bootloader inode should not be counted into quota information. */
 498         if (diff > 0)
 499                 dquot_free_space(inode, diff);
 500         else
 501                 err = dquot_alloc_space(inode, -1 * diff);
 502
 503         if (err < 0) {
 504 revert:
 505                 /* Revert all changes: */
 506                 inode_bl->i_blocks = blocks;
 507                 inode_bl->i_bytes = bytes;
 508                 swap_inode_data(inode, inode_bl);
 509                 ext4_mark_inode_dirty(handle, inode);
 510                 ext4_mark_inode_dirty(handle, inode_bl);
 511         }
 512
 513 err_out1:
 514         ext4_journal_stop(handle);
 515         ext4_double_up_write_data_sem(inode, inode_bl);
 516
 517 err_out:
 518         filemap_invalidate_unlock(inode->i_mapping);
 519 journal_err_out:
 520         unlock_two_nondirectories(inode, inode_bl);
 521         iput(inode_bl);
 522         return err;
 523 }
 524
 525 /*
 526  * If immutable is set and we are not clearing it, we're not allowed to change
 527  * anything else in the inode.  Don't error out if we're only trying to set
 528  * immutable on an immutable file.
 529  */
 530 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 531                                       unsigned int flags)
 532 {
 533         struct ext4_inode_info *ei = EXT4_I(inode);
 534         unsigned int oldflags = ei->i_flags;
 535
 536         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 537                 return 0;
 538
 539         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 540                 return -EPERM;
 541         if (ext4_has_feature_project(inode->i_sb) &&
 542             __kprojid_val(ei->i_projid) != new_projid)
 543                 return -EPERM;
 544
 545         return 0;
 546 }
 547
 548 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 549 {
 550         struct ext4_inode_info *ei = EXT4_I(inode);
 551
 552         if (S_ISDIR(inode->i_mode))
 553                 return;
 554
 555         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 556             test_opt(inode->i_sb, DAX_ALWAYS))
 557                 return;
 558
 559         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 560                 d_mark_dontcache(inode);
 561 }
 562
 563 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 564                            unsigned int flags)
 565 {
 566         /* Allow the DAX flag to be changed on inline directories */
 567         if (S_ISDIR(inode->i_mode)) {
 568                 flags &= ~EXT4_INLINE_DATA_FL;
 569                 oldflags &= ~EXT4_INLINE_DATA_FL;
 570         }
 571
 572         if (flags & EXT4_DAX_FL) {
 573                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 574                      ext4_test_inode_state(inode,
 575                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 576                         return false;
 577                 }
 578         }
 579
 580         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 581                         return false;
 582
 583         return true;
 584 }
 585
 586 static int ext4_ioctl_setflags(struct inode *inode,
 587                                unsigned int flags)
 588 {
 589         struct ext4_inode_info *ei = EXT4_I(inode);
 590         handle_t *handle = NULL;
 591         int err = -EPERM, migrate = 0;
 592         struct ext4_iloc iloc;
 593         unsigned int oldflags, mask, i;
 594         struct super_block *sb = inode->i_sb;
 595
 596         /* Is it quota file? Do not allow user to mess with it */
 597         if (ext4_is_quota_file(inode))
 598                 goto flags_out;
 599
 600         oldflags = ei->i_flags;
 601         /*
 602          * The JOURNAL_DATA flag can only be changed by
 603          * the relevant capability.
 604          */
 605         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 606                 if (!capable(CAP_SYS_RESOURCE))
 607                         goto flags_out;
 608         }
 609
 610         if (!dax_compatible(inode, oldflags, flags)) {
 611                 err = -EOPNOTSUPP;
 612                 goto flags_out;
 613         }
 614
 615         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 616                 migrate = 1;
 617
 618         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 619                 if (!ext4_has_feature_casefold(sb)) {
 620                         err = -EOPNOTSUPP;
 621                         goto flags_out;
 622                 }
 623
 624                 if (!S_ISDIR(inode->i_mode)) {
 625                         err = -ENOTDIR;
 626                         goto flags_out;
 627                 }
 628
 629                 if (!ext4_empty_dir(inode)) {
 630                         err = -ENOTEMPTY;
 631                         goto flags_out;
 632                 }
 633         }
 634
 635         /*
 636          * Wait for all pending directio and then flush all the dirty pages
 637          * for this file.  The flush marks all the pages readonly, so any
 638          * subsequent attempt to write to the file (particularly mmap pages)
 639          * will come through the filesystem and fail.
 640          */
 641         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 642             (flags & EXT4_IMMUTABLE_FL)) {
 643                 inode_dio_wait(inode);
 644                 err = filemap_write_and_wait(inode->i_mapping);
 645                 if (err)
 646                         goto flags_out;
 647         }
 648
 649         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 650         if (IS_ERR(handle)) {
 651                 err = PTR_ERR(handle);
 652                 goto flags_out;
 653         }
 654         if (IS_SYNC(inode))
 655                 ext4_handle_sync(handle);
 656         err = ext4_reserve_inode_write(handle, inode, &iloc);
 657         if (err)
 658                 goto flags_err;
 659
 660         ext4_dax_dontcache(inode, flags);
 661
 662         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 663                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 664                         continue;
 665                 /* These flags get special treatment later */
 666                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 667                         continue;
 668                 if (mask & flags)
 669                         ext4_set_inode_flag(inode, i);
 670                 else
 671                         ext4_clear_inode_flag(inode, i);
 672         }
 673
 674         ext4_set_inode_flags(inode, false);
 675
 676         inode_set_ctime_current(inode);
 677         inode_inc_iversion(inode);
 678
 679         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 680 flags_err:
 681         ext4_journal_stop(handle);
 682         if (err)
 683                 goto flags_out;
 684
 685         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 686                 /*
 687                  * Changes to the journaling mode can cause unsafe changes to
 688                  * S_DAX if the inode is DAX
 689                  */
 690                 if (IS_DAX(inode)) {
 691                         err = -EBUSY;
 692                         goto flags_out;
 693                 }
 694
 695                 err = ext4_change_inode_journal_flag(inode,
 696                                                      flags & EXT4_JOURNAL_DATA_FL);
 697                 if (err)
 698                         goto flags_out;
 699         }
 700         if (migrate) {
 701                 if (flags & EXT4_EXTENTS_FL)
 702                         err = ext4_ext_migrate(inode);
 703                 else
 704                         err = ext4_ind_migrate(inode);
 705         }
 706
 707 flags_out:
 708         return err;
 709 }
 710
 711 #ifdef CONFIG_QUOTA
 712 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 713 {
 714         struct super_block *sb = inode->i_sb;
 715         struct ext4_inode_info *ei = EXT4_I(inode);
 716         int err, rc;
 717         handle_t *handle;
 718         kprojid_t kprojid;
 719         struct ext4_iloc iloc;
 720         struct ext4_inode *raw_inode;
 721         struct dquot *transfer_to[MAXQUOTAS] = { };
 722
 723         if (!ext4_has_feature_project(sb)) {
 724                 if (projid != EXT4_DEF_PROJID)
 725                         return -EOPNOTSUPP;
 726                 else
 727                         return 0;
 728         }
 729
 730         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 731                 return -EOPNOTSUPP;
 732
 733         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 734
 735         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 736                 return 0;
 737
 738         err = -EPERM;
 739         /* Is it quota file? Do not allow user to mess with it */
 740         if (ext4_is_quota_file(inode))
 741                 return err;
 742
 743         err = dquot_initialize(inode);
 744         if (err)
 745                 return err;
 746
 747         err = ext4_get_inode_loc(inode, &iloc);
 748         if (err)
 749                 return err;
 750
 751         raw_inode = ext4_raw_inode(&iloc);
 752         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 753                 err = ext4_expand_extra_isize(inode,
 754                                               EXT4_SB(sb)->s_want_extra_isize,
 755                                               &iloc);
 756                 if (err)
 757                         return err;
 758         } else {
 759                 brelse(iloc.bh);
 760         }
 761
 762         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 763                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 764                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 765         if (IS_ERR(handle))
 766                 return PTR_ERR(handle);
 767
 768         err = ext4_reserve_inode_write(handle, inode, &iloc);
 769         if (err)
 770                 goto out_stop;
 771
 772         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 773         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 774
 775                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 776                  * counts xattr inode references.
 777                  */
 778                 down_read(&EXT4_I(inode)->xattr_sem);
 779                 err = __dquot_transfer(inode, transfer_to);
 780                 up_read(&EXT4_I(inode)->xattr_sem);
 781                 dqput(transfer_to[PRJQUOTA]);
 782                 if (err)
 783                         goto out_dirty;
 784         }
 785
 786         EXT4_I(inode)->i_projid = kprojid;
 787         inode_set_ctime_current(inode);
 788         inode_inc_iversion(inode);
 789 out_dirty:
 790         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 791         if (!err)
 792                 err = rc;
 793 out_stop:
 794         ext4_journal_stop(handle);
 795         return err;
 796 }
 797 #else
 798 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 799 {
 800         if (projid != EXT4_DEF_PROJID)
 801                 return -EOPNOTSUPP;
 802         return 0;
 803 }
 804 #endif
 805
 806 int ext4_force_shutdown(struct super_block *sb, u32 flags)
 807 {
 808         struct ext4_sb_info *sbi = EXT4_SB(sb);
 809         int ret;
 810
 811         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 812                 return -EINVAL;
 813
 814         if (ext4_forced_shutdown(sb))
 815                 return 0;
 816
 817         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 818         trace_ext4_shutdown(sb, flags);
 819
 820         switch (flags) {
 821         case EXT4_GOING_FLAGS_DEFAULT:
 822                 ret = bdev_freeze(sb->s_bdev);
 823                 if (ret)
 824                         return ret;
 825                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 826                 bdev_thaw(sb->s_bdev);
 827                 break;
 828         case EXT4_GOING_FLAGS_LOGFLUSH:
 829                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 830                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 831                         (void) ext4_force_commit(sb);
 832                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 833                 }
 834                 break;
 835         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 836                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 837                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 838                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 839                 break;
 840         default:
 841                 return -EINVAL;
 842         }
 843         clear_opt(sb, DISCARD);
 844         return 0;
 845 }
 846
 847 static int ext4_ioctl_shutdown(struct super_block *sb, unsigned long arg)
 848 {
 849         u32 flags;
 850
 851         if (!capable(CAP_SYS_ADMIN))
 852                 return -EPERM;
 853
 854         if (get_user(flags, (__u32 __user *)arg))
 855                 return -EFAULT;
 856
 857         return ext4_force_shutdown(sb, flags);
 858 }
 859
 860 struct getfsmap_info {
 861         struct super_block      *gi_sb;
 862         struct fsmap_head __user *gi_data;
 863         unsigned int            gi_idx;
 864         __u32                   gi_last_flags;
 865 };
 866
 867 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 868 {
 869         struct getfsmap_info *info = priv;
 870         struct fsmap fm;
 871
 872         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 873
 874         info->gi_last_flags = xfm->fmr_flags;
 875         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 876         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 877                         sizeof(struct fsmap)))
 878                 return -EFAULT;
 879
 880         return 0;
 881 }
 882
 883 static int ext4_ioc_getfsmap(struct super_block *sb,
 884                              struct fsmap_head __user *arg)
 885 {
 886         struct getfsmap_info info = { NULL };
 887         struct ext4_fsmap_head xhead = {0};
 888         struct fsmap_head head;
 889         bool aborted = false;
 890         int error;
 891
 892         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 893                 return -EFAULT;
 894         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 895             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 896                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 897             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 898                        sizeof(head.fmh_keys[1].fmr_reserved)))
 899                 return -EINVAL;
 900         /*
 901          * ext4 doesn't report file extents at all, so the only valid
 902          * file offsets are the magic ones (all zeroes or all ones).
 903          */
 904         if (head.fmh_keys[0].fmr_offset ||
 905             (head.fmh_keys[1].fmr_offset != 0 &&
 906              head.fmh_keys[1].fmr_offset != -1ULL))
 907                 return -EINVAL;
 908
 909         xhead.fmh_iflags = head.fmh_iflags;
 910         xhead.fmh_count = head.fmh_count;
 911         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 912         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 913
 914         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 915         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 916
 917         info.gi_sb = sb;
 918         info.gi_data = arg;
 919         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 920         if (error == EXT4_QUERY_RANGE_ABORT)
 921                 aborted = true;
 922         else if (error)
 923                 return error;
 924
 925         /* If we didn't abort, set the "last" flag in the last fmx */
 926         if (!aborted && info.gi_idx) {
 927                 info.gi_last_flags |= FMR_OF_LAST;
 928                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 929                                  &info.gi_last_flags,
 930                                  sizeof(info.gi_last_flags)))
 931                         return -EFAULT;
 932         }
 933
 934         /* copy back header */
 935         head.fmh_entries = xhead.fmh_entries;
 936         head.fmh_oflags = xhead.fmh_oflags;
 937         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 938                 return -EFAULT;
 939
 940         return 0;
 941 }
 942
 943 static long ext4_ioctl_group_add(struct file *file,
 944                                  struct ext4_new_group_data *input)
 945 {
 946         struct super_block *sb = file_inode(file)->i_sb;
 947         int err, err2=0;
 948
 949         err = ext4_resize_begin(sb);
 950         if (err)
 951                 return err;
 952
 953         if (ext4_has_feature_bigalloc(sb)) {
 954                 ext4_msg(sb, KERN_ERR,
 955                          "Online resizing not supported with bigalloc");
 956                 err = -EOPNOTSUPP;
 957                 goto group_add_out;
 958         }
 959
 960         err = mnt_want_write_file(file);
 961         if (err)
 962                 goto group_add_out;
 963
 964         err = ext4_group_add(sb, input);
 965         if (EXT4_SB(sb)->s_journal) {
 966                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 967                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 968                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 969         }
 970         if (err == 0)
 971                 err = err2;
 972         mnt_drop_write_file(file);
 973         if (!err && ext4_has_group_desc_csum(sb) &&
 974             test_opt(sb, INIT_INODE_TABLE))
 975                 err = ext4_register_li_request(sb, input->group);
 976 group_add_out:
 977         err2 = ext4_resize_end(sb, false);
 978         if (err == 0)
 979                 err = err2;
 980         return err;
 981 }
 982
 983 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 984 {
 985         struct inode *inode = d_inode(dentry);
 986         struct ext4_inode_info *ei = EXT4_I(inode);
 987         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 988
 989         if (S_ISREG(inode->i_mode))
 990                 flags &= ~FS_PROJINHERIT_FL;
 991
 992         fileattr_fill_flags(fa, flags);
 993         if (ext4_has_feature_project(inode->i_sb))
 994                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 995
 996         return 0;
 997 }
 998
 999 int ext4_fileattr_set(struct mnt_idmap *idmap,
1000                       struct dentry *dentry, struct fileattr *fa)
1001 {
1002         struct inode *inode = d_inode(dentry);
1003         u32 flags = fa->flags;
1004         int err = -EOPNOTSUPP;
1005
1006         if (flags & ~EXT4_FL_USER_VISIBLE)
1007                 goto out;
1008
1009         /*
1010          * chattr(1) grabs flags via GETFLAGS, modifies the result and
1011          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
1012          * more restrictive than just silently masking off visible but
1013          * not settable flags as we always did.
1014          */
1015         flags &= EXT4_FL_USER_MODIFIABLE;
1016         if (ext4_mask_flags(inode->i_mode, flags) != flags)
1017                 goto out;
1018         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1019         if (err)
1020                 goto out;
1021         err = ext4_ioctl_setflags(inode, flags);
1022         if (err)
1023                 goto out;
1024         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1025 out:
1026         return err;
1027 }
1028
1029 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1030 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1031
1032 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1033 {
1034         struct fiemap fiemap;
1035         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1036         struct fiemap_extent_info fieinfo = { 0, };
1037         struct inode *inode = file_inode(filp);
1038         int error;
1039
1040         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1041                 return -EFAULT;
1042
1043         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1044                 return -EINVAL;
1045
1046         fieinfo.fi_flags = fiemap.fm_flags;
1047         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1048         fieinfo.fi_extents_start = ufiemap->fm_extents;
1049
1050         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1051                         fiemap.fm_length);
1052         fiemap.fm_flags = fieinfo.fi_flags;
1053         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1054         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1055                 error = -EFAULT;
1056
1057         return error;
1058 }
1059
1060 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1061 {
1062         int err = 0;
1063         __u32 flags = 0;
1064         unsigned int flush_flags = 0;
1065         struct super_block *sb = file_inode(filp)->i_sb;
1066
1067         if (copy_from_user(&flags, (__u32 __user *)arg,
1068                                 sizeof(__u32)))
1069                 return -EFAULT;
1070
1071         if (!capable(CAP_SYS_ADMIN))
1072                 return -EPERM;
1073
1074         /* check for invalid bits set */
1075         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1076                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1077                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1078                 return -EINVAL;
1079
1080         if (!EXT4_SB(sb)->s_journal)
1081                 return -ENODEV;
1082
1083         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1084             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1085                 return -EOPNOTSUPP;
1086
1087         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1088                 return 0;
1089
1090         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1091                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1092
1093         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1094                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1095                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1096         }
1097
1098         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1099         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1100         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1101
1102         return err;
1103 }
1104
1105 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1106 {
1107         size_t len;
1108         int ret = 0;
1109         char new_label[EXT4_LABEL_MAX + 1];
1110         struct super_block *sb = file_inode(filp)->i_sb;
1111
1112         if (!capable(CAP_SYS_ADMIN))
1113                 return -EPERM;
1114
1115         /*
1116          * Copy the maximum length allowed for ext4 label with one more to
1117          * find the required terminating null byte in order to test the
1118          * label length. The on disk label doesn't need to be null terminated.
1119          */
1120         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1121                 return -EFAULT;
1122
1123         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1124         if (len > EXT4_LABEL_MAX)
1125                 return -EINVAL;
1126
1127         /*
1128          * Clear the buffer after the new label
1129          */
1130         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1131
1132         ret = mnt_want_write_file(filp);
1133         if (ret)
1134                 return ret;
1135
1136         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1137
1138         mnt_drop_write_file(filp);
1139         return ret;
1140 }
1141
1142 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1143 {
1144         char label[EXT4_LABEL_MAX + 1];
1145
1146         /*
1147          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1148          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1149          * does not have to.
1150          */
1151         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1152
1153         memset(label, 0, sizeof(label));
1154         lock_buffer(sbi->s_sbh);
1155         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1156         unlock_buffer(sbi->s_sbh);
1157
1158         if (copy_to_user(user_label, label, sizeof(label)))
1159                 return -EFAULT;
1160         return 0;
1161 }
1162
1163 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi,
1164                         struct fsuuid __user *ufsuuid)
1165 {
1166         struct fsuuid fsuuid;
1167         __u8 uuid[UUID_SIZE];
1168
1169         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1170                 return -EFAULT;
1171
1172         if (fsuuid.fsu_len == 0) {
1173                 fsuuid.fsu_len = UUID_SIZE;
1174                 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len,
1175                                         sizeof(fsuuid.fsu_len)))
1176                         return -EFAULT;
1177                 return 0;
1178         }
1179
1180         if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0)
1181                 return -EINVAL;
1182
1183         lock_buffer(sbi->s_sbh);
1184         memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE);
1185         unlock_buffer(sbi->s_sbh);
1186
1187         fsuuid.fsu_len = UUID_SIZE;
1188         if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) ||
1189             copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE))
1190                 return -EFAULT;
1191         return 0;
1192 }
1193
1194 static int ext4_ioctl_setuuid(struct file *filp,
1195                         const struct fsuuid __user *ufsuuid)
1196 {
1197         int ret = 0;
1198         struct super_block *sb = file_inode(filp)->i_sb;
1199         struct fsuuid fsuuid;
1200         __u8 uuid[UUID_SIZE];
1201
1202         if (!capable(CAP_SYS_ADMIN))
1203                 return -EPERM;
1204
1205         /*
1206          * If any checksums (group descriptors or metadata) are being used
1207          * then the checksum seed feature is required to change the UUID.
1208          */
1209         if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb))
1210                         && !ext4_has_feature_csum_seed(sb))
1211                 || ext4_has_feature_stable_inodes(sb))
1212                 return -EOPNOTSUPP;
1213
1214         if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid)))
1215                 return -EFAULT;
1216
1217         if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0)
1218                 return -EINVAL;
1219
1220         if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE))
1221                 return -EFAULT;
1222
1223         ret = mnt_want_write_file(filp);
1224         if (ret)
1225                 return ret;
1226
1227         ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid);
1228         mnt_drop_write_file(filp);
1229
1230         return ret;
1231 }
1232
1233 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1234 {
1235         struct inode *inode = file_inode(filp);
1236         struct super_block *sb = inode->i_sb;
1237         struct mnt_idmap *idmap = file_mnt_idmap(filp);
1238
1239         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1240
1241         switch (cmd) {
1242         case FS_IOC_GETFSMAP:
1243                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1244         case EXT4_IOC_GETVERSION:
1245         case EXT4_IOC_GETVERSION_OLD:
1246                 return put_user(inode->i_generation, (int __user *) arg);
1247         case EXT4_IOC_SETVERSION:
1248         case EXT4_IOC_SETVERSION_OLD: {
1249                 handle_t *handle;
1250                 struct ext4_iloc iloc;
1251                 __u32 generation;
1252                 int err;
1253
1254                 if (!inode_owner_or_capable(idmap, inode))
1255                         return -EPERM;
1256
1257                 if (ext4_has_metadata_csum(inode->i_sb)) {
1258                         ext4_warning(sb, "Setting inode version is not "
1259                                      "supported with metadata_csum enabled.");
1260                         return -ENOTTY;
1261                 }
1262
1263                 err = mnt_want_write_file(filp);
1264                 if (err)
1265                         return err;
1266                 if (get_user(generation, (int __user *) arg)) {
1267                         err = -EFAULT;
1268                         goto setversion_out;
1269                 }
1270
1271                 inode_lock(inode);
1272                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1273                 if (IS_ERR(handle)) {
1274                         err = PTR_ERR(handle);
1275                         goto unlock_out;
1276                 }
1277                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1278                 if (err == 0) {
1279                         inode_set_ctime_current(inode);
1280                         inode_inc_iversion(inode);
1281                         inode->i_generation = generation;
1282                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1283                 }
1284                 ext4_journal_stop(handle);
1285
1286 unlock_out:
1287                 inode_unlock(inode);
1288 setversion_out:
1289                 mnt_drop_write_file(filp);
1290                 return err;
1291         }
1292         case EXT4_IOC_GROUP_EXTEND: {
1293                 ext4_fsblk_t n_blocks_count;
1294                 int err, err2=0;
1295
1296                 err = ext4_resize_begin(sb);
1297                 if (err)
1298                         return err;
1299
1300                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1301                         err = -EFAULT;
1302                         goto group_extend_out;
1303                 }
1304
1305                 if (ext4_has_feature_bigalloc(sb)) {
1306                         ext4_msg(sb, KERN_ERR,
1307                                  "Online resizing not supported with bigalloc");
1308                         err = -EOPNOTSUPP;
1309                         goto group_extend_out;
1310                 }
1311
1312                 err = mnt_want_write_file(filp);
1313                 if (err)
1314                         goto group_extend_out;
1315
1316                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1317                 if (EXT4_SB(sb)->s_journal) {
1318                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1319                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1320                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1321                 }
1322                 if (err == 0)
1323                         err = err2;
1324                 mnt_drop_write_file(filp);
1325 group_extend_out:
1326                 err2 = ext4_resize_end(sb, false);
1327                 if (err == 0)
1328                         err = err2;
1329                 return err;
1330         }
1331
1332         case EXT4_IOC_MOVE_EXT: {
1333                 struct move_extent me;
1334                 struct fd donor;
1335                 int err;
1336
1337                 if (!(filp->f_mode & FMODE_READ) ||
1338                     !(filp->f_mode & FMODE_WRITE))
1339                         return -EBADF;
1340
1341                 if (copy_from_user(&me,
1342                         (struct move_extent __user *)arg, sizeof(me)))
1343                         return -EFAULT;
1344                 me.moved_len = 0;
1345
1346                 donor = fdget(me.donor_fd);
1347                 if (!donor.file)
1348                         return -EBADF;
1349
1350                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1351                         err = -EBADF;
1352                         goto mext_out;
1353                 }
1354
1355                 if (ext4_has_feature_bigalloc(sb)) {
1356                         ext4_msg(sb, KERN_ERR,
1357                                  "Online defrag not supported with bigalloc");
1358                         err = -EOPNOTSUPP;
1359                         goto mext_out;
1360                 } else if (IS_DAX(inode)) {
1361                         ext4_msg(sb, KERN_ERR,
1362                                  "Online defrag not supported with DAX");
1363                         err = -EOPNOTSUPP;
1364                         goto mext_out;
1365                 }
1366
1367                 err = mnt_want_write_file(filp);
1368                 if (err)
1369                         goto mext_out;
1370
1371                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1372                                         me.donor_start, me.len, &me.moved_len);
1373                 mnt_drop_write_file(filp);
1374
1375                 if (copy_to_user((struct move_extent __user *)arg,
1376                                  &me, sizeof(me)))
1377                         err = -EFAULT;
1378 mext_out:
1379                 fdput(donor);
1380                 return err;
1381         }
1382
1383         case EXT4_IOC_GROUP_ADD: {
1384                 struct ext4_new_group_data input;
1385
1386                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1387                                 sizeof(input)))
1388                         return -EFAULT;
1389
1390                 return ext4_ioctl_group_add(filp, &input);
1391         }
1392
1393         case EXT4_IOC_MIGRATE:
1394         {
1395                 int err;
1396                 if (!inode_owner_or_capable(idmap, inode))
1397                         return -EACCES;
1398
1399                 err = mnt_want_write_file(filp);
1400                 if (err)
1401                         return err;
1402                 /*
1403                  * inode_mutex prevent write and truncate on the file.
1404                  * Read still goes through. We take i_data_sem in
1405                  * ext4_ext_swap_inode_data before we switch the
1406                  * inode format to prevent read.
1407                  */
1408                 inode_lock((inode));
1409                 err = ext4_ext_migrate(inode);
1410                 inode_unlock((inode));
1411                 mnt_drop_write_file(filp);
1412                 return err;
1413         }
1414
1415         case EXT4_IOC_ALLOC_DA_BLKS:
1416         {
1417                 int err;
1418                 if (!inode_owner_or_capable(idmap, inode))
1419                         return -EACCES;
1420
1421                 err = mnt_want_write_file(filp);
1422                 if (err)
1423                         return err;
1424                 err = ext4_alloc_da_blocks(inode);
1425                 mnt_drop_write_file(filp);
1426                 return err;
1427         }
1428
1429         case EXT4_IOC_SWAP_BOOT:
1430         {
1431                 int err;
1432                 if (!(filp->f_mode & FMODE_WRITE))
1433                         return -EBADF;
1434                 err = mnt_want_write_file(filp);
1435                 if (err)
1436                         return err;
1437                 err = swap_inode_boot_loader(sb, idmap, inode);
1438                 mnt_drop_write_file(filp);
1439                 return err;
1440         }
1441
1442         case EXT4_IOC_RESIZE_FS: {
1443                 ext4_fsblk_t n_blocks_count;
1444                 int err = 0, err2 = 0;
1445                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1446
1447                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1448                                    sizeof(__u64))) {
1449                         return -EFAULT;
1450                 }
1451
1452                 err = ext4_resize_begin(sb);
1453                 if (err)
1454                         return err;
1455
1456                 err = mnt_want_write_file(filp);
1457                 if (err)
1458                         goto resizefs_out;
1459
1460                 err = ext4_resize_fs(sb, n_blocks_count);
1461                 if (EXT4_SB(sb)->s_journal) {
1462                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1463                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1464                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1465                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1466                 }
1467                 if (err == 0)
1468                         err = err2;
1469                 mnt_drop_write_file(filp);
1470                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1471                     ext4_has_group_desc_csum(sb) &&
1472                     test_opt(sb, INIT_INODE_TABLE))
1473                         err = ext4_register_li_request(sb, o_group);
1474
1475 resizefs_out:
1476                 err2 = ext4_resize_end(sb, true);
1477                 if (err == 0)
1478                         err = err2;
1479                 return err;
1480         }
1481
1482         case FITRIM:
1483         {
1484                 struct fstrim_range range;
1485                 int ret = 0;
1486
1487                 if (!capable(CAP_SYS_ADMIN))
1488                         return -EPERM;
1489
1490                 if (!bdev_max_discard_sectors(sb->s_bdev))
1491                         return -EOPNOTSUPP;
1492
1493                 /*
1494                  * We haven't replayed the journal, so we cannot use our
1495                  * block-bitmap-guided storage zapping commands.
1496                  */
1497                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1498                         return -EROFS;
1499
1500                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1501                     sizeof(range)))
1502                         return -EFAULT;
1503
1504                 ret = ext4_trim_fs(sb, &range);
1505                 if (ret < 0)
1506                         return ret;
1507
1508                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1509                     sizeof(range)))
1510                         return -EFAULT;
1511
1512                 return 0;
1513         }
1514         case EXT4_IOC_PRECACHE_EXTENTS:
1515                 return ext4_ext_precache(inode);
1516
1517         case FS_IOC_SET_ENCRYPTION_POLICY:
1518                 if (!ext4_has_feature_encrypt(sb))
1519                         return -EOPNOTSUPP;
1520                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1521
1522         case FS_IOC_GET_ENCRYPTION_PWSALT:
1523                 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg);
1524
1525         case FS_IOC_GET_ENCRYPTION_POLICY:
1526                 if (!ext4_has_feature_encrypt(sb))
1527                         return -EOPNOTSUPP;
1528                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1529
1530         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1531                 if (!ext4_has_feature_encrypt(sb))
1532                         return -EOPNOTSUPP;
1533                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1534
1535         case FS_IOC_ADD_ENCRYPTION_KEY:
1536                 if (!ext4_has_feature_encrypt(sb))
1537                         return -EOPNOTSUPP;
1538                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1539
1540         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1541                 if (!ext4_has_feature_encrypt(sb))
1542                         return -EOPNOTSUPP;
1543                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1544
1545         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1546                 if (!ext4_has_feature_encrypt(sb))
1547                         return -EOPNOTSUPP;
1548                 return fscrypt_ioctl_remove_key_all_users(filp,
1549                                                           (void __user *)arg);
1550         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1551                 if (!ext4_has_feature_encrypt(sb))
1552                         return -EOPNOTSUPP;
1553                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1554
1555         case FS_IOC_GET_ENCRYPTION_NONCE:
1556                 if (!ext4_has_feature_encrypt(sb))
1557                         return -EOPNOTSUPP;
1558                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1559
1560         case EXT4_IOC_CLEAR_ES_CACHE:
1561         {
1562                 if (!inode_owner_or_capable(idmap, inode))
1563                         return -EACCES;
1564                 ext4_clear_inode_es(inode);
1565                 return 0;
1566         }
1567
1568         case EXT4_IOC_GETSTATE:
1569         {
1570                 __u32   state = 0;
1571
1572                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1573                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1574                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1575                         state |= EXT4_STATE_FLAG_NEW;
1576                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1577                         state |= EXT4_STATE_FLAG_NEWENTRY;
1578                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1579                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1580
1581                 return put_user(state, (__u32 __user *) arg);
1582         }
1583
1584         case EXT4_IOC_GET_ES_CACHE:
1585                 return ext4_ioctl_get_es_cache(filp, arg);
1586
1587         case EXT4_IOC_SHUTDOWN:
1588                 return ext4_ioctl_shutdown(sb, arg);
1589
1590         case FS_IOC_ENABLE_VERITY:
1591                 if (!ext4_has_feature_verity(sb))
1592                         return -EOPNOTSUPP;
1593                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1594
1595         case FS_IOC_MEASURE_VERITY:
1596                 if (!ext4_has_feature_verity(sb))
1597                         return -EOPNOTSUPP;
1598                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1599
1600         case FS_IOC_READ_VERITY_METADATA:
1601                 if (!ext4_has_feature_verity(sb))
1602                         return -EOPNOTSUPP;
1603                 return fsverity_ioctl_read_metadata(filp,
1604                                                     (const void __user *)arg);
1605
1606         case EXT4_IOC_CHECKPOINT:
1607                 return ext4_ioctl_checkpoint(filp, arg);
1608
1609         case FS_IOC_GETFSLABEL:
1610                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1611
1612         case FS_IOC_SETFSLABEL:
1613                 return ext4_ioctl_setlabel(filp,
1614                                            (const void __user *)arg);
1615
1616         case EXT4_IOC_GETFSUUID:
1617                 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg);
1618         case EXT4_IOC_SETFSUUID:
1619                 return ext4_ioctl_setuuid(filp, (const void __user *)arg);
1620         default:
1621                 return -ENOTTY;
1622         }
1623 }
1624
1625 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1626 {
1627         return __ext4_ioctl(filp, cmd, arg);
1628 }
1629
1630 #ifdef CONFIG_COMPAT
1631 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1632 {
1633         /* These are just misnamed, they actually get/put from/to user an int */
1634         switch (cmd) {
1635         case EXT4_IOC32_GETVERSION:
1636                 cmd = EXT4_IOC_GETVERSION;
1637                 break;
1638         case EXT4_IOC32_SETVERSION:
1639                 cmd = EXT4_IOC_SETVERSION;
1640                 break;
1641         case EXT4_IOC32_GROUP_EXTEND:
1642                 cmd = EXT4_IOC_GROUP_EXTEND;
1643                 break;
1644         case EXT4_IOC32_GETVERSION_OLD:
1645                 cmd = EXT4_IOC_GETVERSION_OLD;
1646                 break;
1647         case EXT4_IOC32_SETVERSION_OLD:
1648                 cmd = EXT4_IOC_SETVERSION_OLD;
1649                 break;
1650         case EXT4_IOC32_GETRSVSZ:
1651                 cmd = EXT4_IOC_GETRSVSZ;
1652                 break;
1653         case EXT4_IOC32_SETRSVSZ:
1654                 cmd = EXT4_IOC_SETRSVSZ;
1655                 break;
1656         case EXT4_IOC32_GROUP_ADD: {
1657                 struct compat_ext4_new_group_input __user *uinput;
1658                 struct ext4_new_group_data input;
1659                 int err;
1660
1661                 uinput = compat_ptr(arg);
1662                 err = get_user(input.group, &uinput->group);
1663                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1664                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1665                 err |= get_user(input.inode_table, &uinput->inode_table);
1666                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1667                 err |= get_user(input.reserved_blocks,
1668                                 &uinput->reserved_blocks);
1669                 if (err)
1670                         return -EFAULT;
1671                 return ext4_ioctl_group_add(file, &input);
1672         }
1673         case EXT4_IOC_MOVE_EXT:
1674         case EXT4_IOC_RESIZE_FS:
1675         case FITRIM:
1676         case EXT4_IOC_PRECACHE_EXTENTS:
1677         case FS_IOC_SET_ENCRYPTION_POLICY:
1678         case FS_IOC_GET_ENCRYPTION_PWSALT:
1679         case FS_IOC_GET_ENCRYPTION_POLICY:
1680         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1681         case FS_IOC_ADD_ENCRYPTION_KEY:
1682         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1683         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1684         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1685         case FS_IOC_GET_ENCRYPTION_NONCE:
1686         case EXT4_IOC_SHUTDOWN:
1687         case FS_IOC_GETFSMAP:
1688         case FS_IOC_ENABLE_VERITY:
1689         case FS_IOC_MEASURE_VERITY:
1690         case FS_IOC_READ_VERITY_METADATA:
1691         case EXT4_IOC_CLEAR_ES_CACHE:
1692         case EXT4_IOC_GETSTATE:
1693         case EXT4_IOC_GET_ES_CACHE:
1694         case EXT4_IOC_CHECKPOINT:
1695         case FS_IOC_GETFSLABEL:
1696         case FS_IOC_SETFSLABEL:
1697         case EXT4_IOC_GETFSUUID:
1698         case EXT4_IOC_SETFSUUID:
1699                 break;
1700         default:
1701                 return -ENOIOCTLCMD;
1702         }
1703         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1704 }
1705 #endif
1706
1707 static void set_overhead(struct ext4_super_block *es, const void *arg)
1708 {
1709         es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg));
1710 }
1711
1712 int ext4_update_overhead(struct super_block *sb, bool force)
1713 {
1714         struct ext4_sb_info *sbi = EXT4_SB(sb);
1715
1716         if (sb_rdonly(sb))
1717                 return 0;
1718         if (!force &&
1719             (sbi->s_overhead == 0 ||
1720              sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters)))
1721                 return 0;
1722         return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead);
1723 }