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/uuid.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/delay.h>
  22 #include <linux/iversion.h>
  23 #include <linux/fileattr.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 static
  46 int ext4_update_primary_sb(struct super_block *sb, handle_t *handle,
  47                            ext4_update_sb_callback func,
  48                            const void *arg)
  49 {
  50         int err = 0;
  51         struct ext4_sb_info *sbi = EXT4_SB(sb);
  52         struct buffer_head *bh = sbi->s_sbh;
  53         struct ext4_super_block *es = sbi->s_es;
  54
  55         trace_ext4_update_sb(sb, bh->b_blocknr, 1);
  56
  57         BUFFER_TRACE(bh, "get_write_access");
  58         err = ext4_journal_get_write_access(handle, sb,
  59                                             bh,
  60                                             EXT4_JTR_NONE);
  61         if (err)
  62                 goto out_err;
  63
  64         lock_buffer(bh);
  65         func(es, arg);
  66         ext4_superblock_csum_set(sb);
  67         unlock_buffer(bh);
  68
  69         if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) {
  70                 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to "
  71                          "superblock detected");
  72                 clear_buffer_write_io_error(bh);
  73                 set_buffer_uptodate(bh);
  74         }
  75
  76         err = ext4_handle_dirty_metadata(handle, NULL, bh);
  77         if (err)
  78                 goto out_err;
  79         err = sync_dirty_buffer(bh);
  80 out_err:
  81         ext4_std_error(sb, err);
  82         return err;
  83 }
  84
  85 /*
  86  * Update one backup superblock in the group 'grp' using the callback
  87  * function 'func' and argument 'arg'. If the handle is NULL the
  88  * modification is not journalled.
  89  *
  90  * Returns: 0 when no modification was done (no superblock in the group)
  91  *          1 when the modification was successful
  92  *         <0 on error
  93  */
  94 static int ext4_update_backup_sb(struct super_block *sb,
  95                                  handle_t *handle, ext4_group_t grp,
  96                                  ext4_update_sb_callback func, const void *arg)
  97 {
  98         int err = 0;
  99         ext4_fsblk_t sb_block;
 100         struct buffer_head *bh;
 101         unsigned long offset = 0;
 102         struct ext4_super_block *es;
 103
 104         if (!ext4_bg_has_super(sb, grp))
 105                 return 0;
 106
 107         /*
 108          * For the group 0 there is always 1k padding, so we have
 109          * either adjust offset, or sb_block depending on blocksize
 110          */
 111         if (grp == 0) {
 112                 sb_block = 1 * EXT4_MIN_BLOCK_SIZE;
 113                 offset = do_div(sb_block, sb->s_blocksize);
 114         } else {
 115                 sb_block = ext4_group_first_block_no(sb, grp);
 116                 offset = 0;
 117         }
 118
 119         trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0);
 120
 121         bh = ext4_sb_bread(sb, sb_block, 0);
 122         if (IS_ERR(bh))
 123                 return PTR_ERR(bh);
 124
 125         if (handle) {
 126                 BUFFER_TRACE(bh, "get_write_access");
 127                 err = ext4_journal_get_write_access(handle, sb,
 128                                                     bh,
 129                                                     EXT4_JTR_NONE);
 130                 if (err)
 131                         goto out_bh;
 132         }
 133
 134         es = (struct ext4_super_block *) (bh->b_data + offset);
 135         lock_buffer(bh);
 136         if (ext4_has_metadata_csum(sb) &&
 137             es->s_checksum != ext4_superblock_csum(sb, es)) {
 138                 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup "
 139                 "superblock %llu\n", sb_block);
 140                 unlock_buffer(bh);
 141                 err = -EFSBADCRC;
 142                 goto out_bh;
 143         }
 144         func(es, arg);
 145         if (ext4_has_metadata_csum(sb))
 146                 es->s_checksum = ext4_superblock_csum(sb, es);
 147         set_buffer_uptodate(bh);
 148         unlock_buffer(bh);
 149
 150         if (err)
 151                 goto out_bh;
 152
 153         if (handle) {
 154                 err = ext4_handle_dirty_metadata(handle, NULL, bh);
 155                 if (err)
 156                         goto out_bh;
 157         } else {
 158                 BUFFER_TRACE(bh, "marking dirty");
 159                 mark_buffer_dirty(bh);
 160         }
 161         err = sync_dirty_buffer(bh);
 162
 163 out_bh:
 164         brelse(bh);
 165         ext4_std_error(sb, err);
 166         return (err) ? err : 1;
 167 }
 168
 169 /*
 170  * Update primary and backup superblocks using the provided function
 171  * func and argument arg.
 172  *
 173  * Only the primary superblock and at most two backup superblock
 174  * modifications are journalled; the rest is modified without journal.
 175  * This is safe because e2fsck will re-write them if there is a problem,
 176  * and we're very unlikely to ever need more than two backups.
 177  */
 178 static
 179 int ext4_update_superblocks_fn(struct super_block *sb,
 180                                ext4_update_sb_callback func,
 181                                const void *arg)
 182 {
 183         handle_t *handle;
 184         ext4_group_t ngroups;
 185         unsigned int three = 1;
 186         unsigned int five = 5;
 187         unsigned int seven = 7;
 188         int err = 0, ret, i;
 189         ext4_group_t grp, primary_grp;
 190         struct ext4_sb_info *sbi = EXT4_SB(sb);
 191
 192         /*
 193          * We can't update superblocks while the online resize is running
 194          */
 195         if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 196                                   &sbi->s_ext4_flags)) {
 197                 ext4_msg(sb, KERN_ERR, "Can't modify superblock while"
 198                          "performing online resize");
 199                 return -EBUSY;
 200         }
 201
 202         /*
 203          * We're only going to update primary superblock and two
 204          * backup superblocks in this transaction.
 205          */
 206         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3);
 207         if (IS_ERR(handle)) {
 208                 err = PTR_ERR(handle);
 209                 goto out;
 210         }
 211
 212         /* Update primary superblock */
 213         err = ext4_update_primary_sb(sb, handle, func, arg);
 214         if (err) {
 215                 ext4_msg(sb, KERN_ERR, "Failed to update primary "
 216                          "superblock");
 217                 goto out_journal;
 218         }
 219
 220         primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr);
 221         ngroups = ext4_get_groups_count(sb);
 222
 223         /*
 224          * Update backup superblocks. We have to start from group 0
 225          * because it might not be where the primary superblock is
 226          * if the fs is mounted with -o sb=<backup_sb_block>
 227          */
 228         i = 0;
 229         grp = 0;
 230         while (grp < ngroups) {
 231                 /* Skip primary superblock */
 232                 if (grp == primary_grp)
 233                         goto next_grp;
 234
 235                 ret = ext4_update_backup_sb(sb, handle, grp, func, arg);
 236                 if (ret < 0) {
 237                         /* Ignore bad checksum; try to update next sb */
 238                         if (ret == -EFSBADCRC)
 239                                 goto next_grp;
 240                         err = ret;
 241                         goto out_journal;
 242                 }
 243
 244                 i += ret;
 245                 if (handle && i > 1) {
 246                         /*
 247                          * We're only journalling primary superblock and
 248                          * two backup superblocks; the rest is not
 249                          * journalled.
 250                          */
 251                         err = ext4_journal_stop(handle);
 252                         if (err)
 253                                 goto out;
 254                         handle = NULL;
 255                 }
 256 next_grp:
 257                 grp = ext4_list_backups(sb, &three, &five, &seven);
 258         }
 259
 260 out_journal:
 261         if (handle) {
 262                 ret = ext4_journal_stop(handle);
 263                 if (ret && !err)
 264                         err = ret;
 265         }
 266 out:
 267         clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags);
 268         smp_mb__after_atomic();
 269         return err ? err : 0;
 270 }
 271
 272 /*
 273  * Swap memory between @a and @b for @len bytes.
 274  *
 275  * @a:          pointer to first memory area
 276  * @b:          pointer to second memory area
 277  * @len:        number of bytes to swap
 278  *
 279  */
 280 static void memswap(void *a, void *b, size_t len)
 281 {
 282         unsigned char *ap, *bp;
 283
 284         ap = (unsigned char *)a;
 285         bp = (unsigned char *)b;
 286         while (len-- > 0) {
 287                 swap(*ap, *bp);
 288                 ap++;
 289                 bp++;
 290         }
 291 }
 292
 293 /*
 294  * Swap i_data and associated attributes between @inode1 and @inode2.
 295  * This function is used for the primary swap between inode1 and inode2
 296  * and also to revert this primary swap in case of errors.
 297  *
 298  * Therefore you have to make sure, that calling this method twice
 299  * will revert all changes.
 300  *
 301  * @inode1:     pointer to first inode
 302  * @inode2:     pointer to second inode
 303  */
 304 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
 305 {
 306         loff_t isize;
 307         struct ext4_inode_info *ei1;
 308         struct ext4_inode_info *ei2;
 309         unsigned long tmp;
 310
 311         ei1 = EXT4_I(inode1);
 312         ei2 = EXT4_I(inode2);
 313
 314         swap(inode1->i_version, inode2->i_version);
 315         swap(inode1->i_atime, inode2->i_atime);
 316         swap(inode1->i_mtime, inode2->i_mtime);
 317
 318         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
 319         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
 320         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
 321                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
 322         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
 323         swap(ei1->i_disksize, ei2->i_disksize);
 324         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
 325         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
 326
 327         isize = i_size_read(inode1);
 328         i_size_write(inode1, i_size_read(inode2));
 329         i_size_write(inode2, isize);
 330 }
 331
 332 void ext4_reset_inode_seed(struct inode *inode)
 333 {
 334         struct ext4_inode_info *ei = EXT4_I(inode);
 335         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
 336         __le32 inum = cpu_to_le32(inode->i_ino);
 337         __le32 gen = cpu_to_le32(inode->i_generation);
 338         __u32 csum;
 339
 340         if (!ext4_has_metadata_csum(inode->i_sb))
 341                 return;
 342
 343         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 344         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 345 }
 346
 347 /*
 348  * Swap the information from the given @inode and the inode
 349  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 350  * important fields of the inodes.
 351  *
 352  * @sb:         the super block of the filesystem
 353  * @mnt_userns: user namespace of the mount the inode was found from
 354  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 355  *
 356  */
 357 static long swap_inode_boot_loader(struct super_block *sb,
 358                                 struct user_namespace *mnt_userns,
 359                                 struct inode *inode)
 360 {
 361         handle_t *handle;
 362         int err;
 363         struct inode *inode_bl;
 364         struct ext4_inode_info *ei_bl;
 365         qsize_t size, size_bl, diff;
 366         blkcnt_t blocks;
 367         unsigned short bytes;
 368
 369         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 370         if (IS_ERR(inode_bl))
 371                 return PTR_ERR(inode_bl);
 372         ei_bl = EXT4_I(inode_bl);
 373
 374         /* Protect orig inodes against a truncate and make sure,
 375          * that only 1 swap_inode_boot_loader is running. */
 376         lock_two_nondirectories(inode, inode_bl);
 377
 378         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 379             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 380             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 381             ext4_has_inline_data(inode)) {
 382                 err = -EINVAL;
 383                 goto journal_err_out;
 384         }
 385
 386         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 387             !inode_owner_or_capable(mnt_userns, inode) ||
 388             !capable(CAP_SYS_ADMIN)) {
 389                 err = -EPERM;
 390                 goto journal_err_out;
 391         }
 392
 393         filemap_invalidate_lock(inode->i_mapping);
 394         err = filemap_write_and_wait(inode->i_mapping);
 395         if (err)
 396                 goto err_out;
 397
 398         err = filemap_write_and_wait(inode_bl->i_mapping);
 399         if (err)
 400                 goto err_out;
 401
 402         /* Wait for all existing dio workers */
 403         inode_dio_wait(inode);
 404         inode_dio_wait(inode_bl);
 405
 406         truncate_inode_pages(&inode->i_data, 0);
 407         truncate_inode_pages(&inode_bl->i_data, 0);
 408
 409         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 410         if (IS_ERR(handle)) {
 411                 err = -EINVAL;
 412                 goto err_out;
 413         }
 414         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle);
 415
 416         /* Protect extent tree against block allocations via delalloc */
 417         ext4_double_down_write_data_sem(inode, inode_bl);
 418
 419         if (inode_bl->i_nlink == 0) {
 420                 /* this inode has never been used as a BOOT_LOADER */
 421                 set_nlink(inode_bl, 1);
 422                 i_uid_write(inode_bl, 0);
 423                 i_gid_write(inode_bl, 0);
 424                 inode_bl->i_flags = 0;
 425                 ei_bl->i_flags = 0;
 426                 inode_set_iversion(inode_bl, 1);
 427                 i_size_write(inode_bl, 0);
 428                 inode_bl->i_mode = S_IFREG;
 429                 if (ext4_has_feature_extents(sb)) {
 430                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 431                         ext4_ext_tree_init(handle, inode_bl);
 432                 } else
 433                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 434         }
 435
 436         err = dquot_initialize(inode);
 437         if (err)
 438                 goto err_out1;
 439
 440         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 441         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 442         diff = size - size_bl;
 443         swap_inode_data(inode, inode_bl);
 444
 445         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 446
 447         inode->i_generation = prandom_u32();
 448         inode_bl->i_generation = prandom_u32();
 449         ext4_reset_inode_seed(inode);
 450         ext4_reset_inode_seed(inode_bl);
 451
 452         ext4_discard_preallocations(inode, 0);
 453
 454         err = ext4_mark_inode_dirty(handle, inode);
 455         if (err < 0) {
 456                 /* No need to update quota information. */
 457                 ext4_warning(inode->i_sb,
 458                         "couldn't mark inode #%lu dirty (err %d)",
 459                         inode->i_ino, err);
 460                 /* Revert all changes: */
 461                 swap_inode_data(inode, inode_bl);
 462                 ext4_mark_inode_dirty(handle, inode);
 463                 goto err_out1;
 464         }
 465
 466         blocks = inode_bl->i_blocks;
 467         bytes = inode_bl->i_bytes;
 468         inode_bl->i_blocks = inode->i_blocks;
 469         inode_bl->i_bytes = inode->i_bytes;
 470         err = ext4_mark_inode_dirty(handle, inode_bl);
 471         if (err < 0) {
 472                 /* No need to update quota information. */
 473                 ext4_warning(inode_bl->i_sb,
 474                         "couldn't mark inode #%lu dirty (err %d)",
 475                         inode_bl->i_ino, err);
 476                 goto revert;
 477         }
 478
 479         /* Bootloader inode should not be counted into quota information. */
 480         if (diff > 0)
 481                 dquot_free_space(inode, diff);
 482         else
 483                 err = dquot_alloc_space(inode, -1 * diff);
 484
 485         if (err < 0) {
 486 revert:
 487                 /* Revert all changes: */
 488                 inode_bl->i_blocks = blocks;
 489                 inode_bl->i_bytes = bytes;
 490                 swap_inode_data(inode, inode_bl);
 491                 ext4_mark_inode_dirty(handle, inode);
 492                 ext4_mark_inode_dirty(handle, inode_bl);
 493         }
 494
 495 err_out1:
 496         ext4_journal_stop(handle);
 497         ext4_double_up_write_data_sem(inode, inode_bl);
 498
 499 err_out:
 500         filemap_invalidate_unlock(inode->i_mapping);
 501 journal_err_out:
 502         unlock_two_nondirectories(inode, inode_bl);
 503         iput(inode_bl);
 504         return err;
 505 }
 506
 507 #ifdef CONFIG_FS_ENCRYPTION
 508 static int uuid_is_zero(__u8 u[16])
 509 {
 510         int     i;
 511
 512         for (i = 0; i < 16; i++)
 513                 if (u[i])
 514                         return 0;
 515         return 1;
 516 }
 517 #endif
 518
 519 /*
 520  * If immutable is set and we are not clearing it, we're not allowed to change
 521  * anything else in the inode.  Don't error out if we're only trying to set
 522  * immutable on an immutable file.
 523  */
 524 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 525                                       unsigned int flags)
 526 {
 527         struct ext4_inode_info *ei = EXT4_I(inode);
 528         unsigned int oldflags = ei->i_flags;
 529
 530         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 531                 return 0;
 532
 533         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 534                 return -EPERM;
 535         if (ext4_has_feature_project(inode->i_sb) &&
 536             __kprojid_val(ei->i_projid) != new_projid)
 537                 return -EPERM;
 538
 539         return 0;
 540 }
 541
 542 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags)
 543 {
 544         struct ext4_inode_info *ei = EXT4_I(inode);
 545
 546         if (S_ISDIR(inode->i_mode))
 547                 return;
 548
 549         if (test_opt2(inode->i_sb, DAX_NEVER) ||
 550             test_opt(inode->i_sb, DAX_ALWAYS))
 551                 return;
 552
 553         if ((ei->i_flags ^ flags) & EXT4_DAX_FL)
 554                 d_mark_dontcache(inode);
 555 }
 556
 557 static bool dax_compatible(struct inode *inode, unsigned int oldflags,
 558                            unsigned int flags)
 559 {
 560         /* Allow the DAX flag to be changed on inline directories */
 561         if (S_ISDIR(inode->i_mode)) {
 562                 flags &= ~EXT4_INLINE_DATA_FL;
 563                 oldflags &= ~EXT4_INLINE_DATA_FL;
 564         }
 565
 566         if (flags & EXT4_DAX_FL) {
 567                 if ((oldflags & EXT4_DAX_MUT_EXCL) ||
 568                      ext4_test_inode_state(inode,
 569                                           EXT4_STATE_VERITY_IN_PROGRESS)) {
 570                         return false;
 571                 }
 572         }
 573
 574         if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL))
 575                         return false;
 576
 577         return true;
 578 }
 579
 580 static int ext4_ioctl_setflags(struct inode *inode,
 581                                unsigned int flags)
 582 {
 583         struct ext4_inode_info *ei = EXT4_I(inode);
 584         handle_t *handle = NULL;
 585         int err = -EPERM, migrate = 0;
 586         struct ext4_iloc iloc;
 587         unsigned int oldflags, mask, i;
 588         struct super_block *sb = inode->i_sb;
 589
 590         /* Is it quota file? Do not allow user to mess with it */
 591         if (ext4_is_quota_file(inode))
 592                 goto flags_out;
 593
 594         oldflags = ei->i_flags;
 595         /*
 596          * The JOURNAL_DATA flag can only be changed by
 597          * the relevant capability.
 598          */
 599         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 600                 if (!capable(CAP_SYS_RESOURCE))
 601                         goto flags_out;
 602         }
 603
 604         if (!dax_compatible(inode, oldflags, flags)) {
 605                 err = -EOPNOTSUPP;
 606                 goto flags_out;
 607         }
 608
 609         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 610                 migrate = 1;
 611
 612         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 613                 if (!ext4_has_feature_casefold(sb)) {
 614                         err = -EOPNOTSUPP;
 615                         goto flags_out;
 616                 }
 617
 618                 if (!S_ISDIR(inode->i_mode)) {
 619                         err = -ENOTDIR;
 620                         goto flags_out;
 621                 }
 622
 623                 if (!ext4_empty_dir(inode)) {
 624                         err = -ENOTEMPTY;
 625                         goto flags_out;
 626                 }
 627         }
 628
 629         /*
 630          * Wait for all pending directio and then flush all the dirty pages
 631          * for this file.  The flush marks all the pages readonly, so any
 632          * subsequent attempt to write to the file (particularly mmap pages)
 633          * will come through the filesystem and fail.
 634          */
 635         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 636             (flags & EXT4_IMMUTABLE_FL)) {
 637                 inode_dio_wait(inode);
 638                 err = filemap_write_and_wait(inode->i_mapping);
 639                 if (err)
 640                         goto flags_out;
 641         }
 642
 643         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 644         if (IS_ERR(handle)) {
 645                 err = PTR_ERR(handle);
 646                 goto flags_out;
 647         }
 648         if (IS_SYNC(inode))
 649                 ext4_handle_sync(handle);
 650         err = ext4_reserve_inode_write(handle, inode, &iloc);
 651         if (err)
 652                 goto flags_err;
 653
 654         ext4_dax_dontcache(inode, flags);
 655
 656         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 657                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 658                         continue;
 659                 /* These flags get special treatment later */
 660                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 661                         continue;
 662                 if (mask & flags)
 663                         ext4_set_inode_flag(inode, i);
 664                 else
 665                         ext4_clear_inode_flag(inode, i);
 666         }
 667
 668         ext4_set_inode_flags(inode, false);
 669
 670         inode->i_ctime = current_time(inode);
 671
 672         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 673 flags_err:
 674         ext4_journal_stop(handle);
 675         if (err)
 676                 goto flags_out;
 677
 678         if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 679                 /*
 680                  * Changes to the journaling mode can cause unsafe changes to
 681                  * S_DAX if the inode is DAX
 682                  */
 683                 if (IS_DAX(inode)) {
 684                         err = -EBUSY;
 685                         goto flags_out;
 686                 }
 687
 688                 err = ext4_change_inode_journal_flag(inode,
 689                                                      flags & EXT4_JOURNAL_DATA_FL);
 690                 if (err)
 691                         goto flags_out;
 692         }
 693         if (migrate) {
 694                 if (flags & EXT4_EXTENTS_FL)
 695                         err = ext4_ext_migrate(inode);
 696                 else
 697                         err = ext4_ind_migrate(inode);
 698         }
 699
 700 flags_out:
 701         return err;
 702 }
 703
 704 #ifdef CONFIG_QUOTA
 705 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 706 {
 707         struct super_block *sb = inode->i_sb;
 708         struct ext4_inode_info *ei = EXT4_I(inode);
 709         int err, rc;
 710         handle_t *handle;
 711         kprojid_t kprojid;
 712         struct ext4_iloc iloc;
 713         struct ext4_inode *raw_inode;
 714         struct dquot *transfer_to[MAXQUOTAS] = { };
 715
 716         if (!ext4_has_feature_project(sb)) {
 717                 if (projid != EXT4_DEF_PROJID)
 718                         return -EOPNOTSUPP;
 719                 else
 720                         return 0;
 721         }
 722
 723         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 724                 return -EOPNOTSUPP;
 725
 726         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 727
 728         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 729                 return 0;
 730
 731         err = -EPERM;
 732         /* Is it quota file? Do not allow user to mess with it */
 733         if (ext4_is_quota_file(inode))
 734                 return err;
 735
 736         err = ext4_get_inode_loc(inode, &iloc);
 737         if (err)
 738                 return err;
 739
 740         raw_inode = ext4_raw_inode(&iloc);
 741         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 742                 err = ext4_expand_extra_isize(inode,
 743                                               EXT4_SB(sb)->s_want_extra_isize,
 744                                               &iloc);
 745                 if (err)
 746                         return err;
 747         } else {
 748                 brelse(iloc.bh);
 749         }
 750
 751         err = dquot_initialize(inode);
 752         if (err)
 753                 return err;
 754
 755         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 756                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 757                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 758         if (IS_ERR(handle))
 759                 return PTR_ERR(handle);
 760
 761         err = ext4_reserve_inode_write(handle, inode, &iloc);
 762         if (err)
 763                 goto out_stop;
 764
 765         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 766         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 767
 768                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 769                  * counts xattr inode references.
 770                  */
 771                 down_read(&EXT4_I(inode)->xattr_sem);
 772                 err = __dquot_transfer(inode, transfer_to);
 773                 up_read(&EXT4_I(inode)->xattr_sem);
 774                 dqput(transfer_to[PRJQUOTA]);
 775                 if (err)
 776                         goto out_dirty;
 777         }
 778
 779         EXT4_I(inode)->i_projid = kprojid;
 780         inode->i_ctime = current_time(inode);
 781 out_dirty:
 782         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 783         if (!err)
 784                 err = rc;
 785 out_stop:
 786         ext4_journal_stop(handle);
 787         return err;
 788 }
 789 #else
 790 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid)
 791 {
 792         if (projid != EXT4_DEF_PROJID)
 793                 return -EOPNOTSUPP;
 794         return 0;
 795 }
 796 #endif
 797
 798 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 799 {
 800         struct ext4_sb_info *sbi = EXT4_SB(sb);
 801         __u32 flags;
 802
 803         if (!capable(CAP_SYS_ADMIN))
 804                 return -EPERM;
 805
 806         if (get_user(flags, (__u32 __user *)arg))
 807                 return -EFAULT;
 808
 809         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 810                 return -EINVAL;
 811
 812         if (ext4_forced_shutdown(sbi))
 813                 return 0;
 814
 815         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 816         trace_ext4_shutdown(sb, flags);
 817
 818         switch (flags) {
 819         case EXT4_GOING_FLAGS_DEFAULT:
 820                 freeze_bdev(sb->s_bdev);
 821                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 822                 thaw_bdev(sb->s_bdev);
 823                 break;
 824         case EXT4_GOING_FLAGS_LOGFLUSH:
 825                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 826                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 827                         (void) ext4_force_commit(sb);
 828                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 829                 }
 830                 break;
 831         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 832                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 833                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 834                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 835                 break;
 836         default:
 837                 return -EINVAL;
 838         }
 839         clear_opt(sb, DISCARD);
 840         return 0;
 841 }
 842
 843 struct getfsmap_info {
 844         struct super_block      *gi_sb;
 845         struct fsmap_head __user *gi_data;
 846         unsigned int            gi_idx;
 847         __u32                   gi_last_flags;
 848 };
 849
 850 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 851 {
 852         struct getfsmap_info *info = priv;
 853         struct fsmap fm;
 854
 855         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 856
 857         info->gi_last_flags = xfm->fmr_flags;
 858         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 859         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 860                         sizeof(struct fsmap)))
 861                 return -EFAULT;
 862
 863         return 0;
 864 }
 865
 866 static int ext4_ioc_getfsmap(struct super_block *sb,
 867                              struct fsmap_head __user *arg)
 868 {
 869         struct getfsmap_info info = { NULL };
 870         struct ext4_fsmap_head xhead = {0};
 871         struct fsmap_head head;
 872         bool aborted = false;
 873         int error;
 874
 875         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 876                 return -EFAULT;
 877         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 878             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 879                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 880             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 881                        sizeof(head.fmh_keys[1].fmr_reserved)))
 882                 return -EINVAL;
 883         /*
 884          * ext4 doesn't report file extents at all, so the only valid
 885          * file offsets are the magic ones (all zeroes or all ones).
 886          */
 887         if (head.fmh_keys[0].fmr_offset ||
 888             (head.fmh_keys[1].fmr_offset != 0 &&
 889              head.fmh_keys[1].fmr_offset != -1ULL))
 890                 return -EINVAL;
 891
 892         xhead.fmh_iflags = head.fmh_iflags;
 893         xhead.fmh_count = head.fmh_count;
 894         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 895         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 896
 897         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 898         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 899
 900         info.gi_sb = sb;
 901         info.gi_data = arg;
 902         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 903         if (error == EXT4_QUERY_RANGE_ABORT)
 904                 aborted = true;
 905         else if (error)
 906                 return error;
 907
 908         /* If we didn't abort, set the "last" flag in the last fmx */
 909         if (!aborted && info.gi_idx) {
 910                 info.gi_last_flags |= FMR_OF_LAST;
 911                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 912                                  &info.gi_last_flags,
 913                                  sizeof(info.gi_last_flags)))
 914                         return -EFAULT;
 915         }
 916
 917         /* copy back header */
 918         head.fmh_entries = xhead.fmh_entries;
 919         head.fmh_oflags = xhead.fmh_oflags;
 920         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 921                 return -EFAULT;
 922
 923         return 0;
 924 }
 925
 926 static long ext4_ioctl_group_add(struct file *file,
 927                                  struct ext4_new_group_data *input)
 928 {
 929         struct super_block *sb = file_inode(file)->i_sb;
 930         int err, err2=0;
 931
 932         err = ext4_resize_begin(sb);
 933         if (err)
 934                 return err;
 935
 936         if (ext4_has_feature_bigalloc(sb)) {
 937                 ext4_msg(sb, KERN_ERR,
 938                          "Online resizing not supported with bigalloc");
 939                 err = -EOPNOTSUPP;
 940                 goto group_add_out;
 941         }
 942
 943         err = mnt_want_write_file(file);
 944         if (err)
 945                 goto group_add_out;
 946
 947         err = ext4_group_add(sb, input);
 948         if (EXT4_SB(sb)->s_journal) {
 949                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 950                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
 951                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 952         }
 953         if (err == 0)
 954                 err = err2;
 955         mnt_drop_write_file(file);
 956         if (!err && ext4_has_group_desc_csum(sb) &&
 957             test_opt(sb, INIT_INODE_TABLE))
 958                 err = ext4_register_li_request(sb, input->group);
 959 group_add_out:
 960         ext4_resize_end(sb);
 961         return err;
 962 }
 963
 964 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa)
 965 {
 966         struct inode *inode = d_inode(dentry);
 967         struct ext4_inode_info *ei = EXT4_I(inode);
 968         u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 969
 970         if (S_ISREG(inode->i_mode))
 971                 flags &= ~FS_PROJINHERIT_FL;
 972
 973         fileattr_fill_flags(fa, flags);
 974         if (ext4_has_feature_project(inode->i_sb))
 975                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 976
 977         return 0;
 978 }
 979
 980 int ext4_fileattr_set(struct user_namespace *mnt_userns,
 981                       struct dentry *dentry, struct fileattr *fa)
 982 {
 983         struct inode *inode = d_inode(dentry);
 984         u32 flags = fa->flags;
 985         int err = -EOPNOTSUPP;
 986
 987         if (flags & ~EXT4_FL_USER_VISIBLE)
 988                 goto out;
 989
 990         /*
 991          * chattr(1) grabs flags via GETFLAGS, modifies the result and
 992          * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 993          * more restrictive than just silently masking off visible but
 994          * not settable flags as we always did.
 995          */
 996         flags &= EXT4_FL_USER_MODIFIABLE;
 997         if (ext4_mask_flags(inode->i_mode, flags) != flags)
 998                 goto out;
 999         err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags);
1000         if (err)
1001                 goto out;
1002         err = ext4_ioctl_setflags(inode, flags);
1003         if (err)
1004                 goto out;
1005         err = ext4_ioctl_setproject(inode, fa->fsx_projid);
1006 out:
1007         return err;
1008 }
1009
1010 /* So that the fiemap access checks can't overflow on 32 bit machines. */
1011 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
1012
1013 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
1014 {
1015         struct fiemap fiemap;
1016         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
1017         struct fiemap_extent_info fieinfo = { 0, };
1018         struct inode *inode = file_inode(filp);
1019         int error;
1020
1021         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
1022                 return -EFAULT;
1023
1024         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
1025                 return -EINVAL;
1026
1027         fieinfo.fi_flags = fiemap.fm_flags;
1028         fieinfo.fi_extents_max = fiemap.fm_extent_count;
1029         fieinfo.fi_extents_start = ufiemap->fm_extents;
1030
1031         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
1032                         fiemap.fm_length);
1033         fiemap.fm_flags = fieinfo.fi_flags;
1034         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
1035         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
1036                 error = -EFAULT;
1037
1038         return error;
1039 }
1040
1041 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg)
1042 {
1043         int err = 0;
1044         __u32 flags = 0;
1045         unsigned int flush_flags = 0;
1046         struct super_block *sb = file_inode(filp)->i_sb;
1047
1048         if (copy_from_user(&flags, (__u32 __user *)arg,
1049                                 sizeof(__u32)))
1050                 return -EFAULT;
1051
1052         if (!capable(CAP_SYS_ADMIN))
1053                 return -EPERM;
1054
1055         /* check for invalid bits set */
1056         if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) ||
1057                                 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1058                                 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT)))
1059                 return -EINVAL;
1060
1061         if (!EXT4_SB(sb)->s_journal)
1062                 return -ENODEV;
1063
1064         if (flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID)
1065                 return -EINVAL;
1066
1067         if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) &&
1068             !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev))
1069                 return -EOPNOTSUPP;
1070
1071         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
1072                 return 0;
1073
1074         if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD)
1075                 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD;
1076
1077         if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) {
1078                 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT;
1079                 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow");
1080         }
1081
1082         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1083         err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags);
1084         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1085
1086         return err;
1087 }
1088
1089 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label)
1090 {
1091         size_t len;
1092         int ret = 0;
1093         char new_label[EXT4_LABEL_MAX + 1];
1094         struct super_block *sb = file_inode(filp)->i_sb;
1095
1096         if (!capable(CAP_SYS_ADMIN))
1097                 return -EPERM;
1098
1099         /*
1100          * Copy the maximum length allowed for ext4 label with one more to
1101          * find the required terminating null byte in order to test the
1102          * label length. The on disk label doesn't need to be null terminated.
1103          */
1104         if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1))
1105                 return -EFAULT;
1106
1107         len = strnlen(new_label, EXT4_LABEL_MAX + 1);
1108         if (len > EXT4_LABEL_MAX)
1109                 return -EINVAL;
1110
1111         /*
1112          * Clear the buffer after the new label
1113          */
1114         memset(new_label + len, 0, EXT4_LABEL_MAX - len);
1115
1116         ret = mnt_want_write_file(filp);
1117         if (ret)
1118                 return ret;
1119
1120         ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label);
1121
1122         mnt_drop_write_file(filp);
1123         return ret;
1124 }
1125
1126 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label)
1127 {
1128         char label[EXT4_LABEL_MAX + 1];
1129
1130         /*
1131          * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because
1132          * FSLABEL_MAX must include terminating null byte, while s_volume_name
1133          * does not have to.
1134          */
1135         BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX);
1136
1137         memset(label, 0, sizeof(label));
1138         lock_buffer(sbi->s_sbh);
1139         strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX);
1140         unlock_buffer(sbi->s_sbh);
1141
1142         if (copy_to_user(user_label, label, sizeof(label)))
1143                 return -EFAULT;
1144         return 0;
1145 }
1146
1147 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1148 {
1149         struct inode *inode = file_inode(filp);
1150         struct super_block *sb = inode->i_sb;
1151         struct user_namespace *mnt_userns = file_mnt_user_ns(filp);
1152
1153         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
1154
1155         switch (cmd) {
1156         case FS_IOC_GETFSMAP:
1157                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
1158         case EXT4_IOC_GETVERSION:
1159         case EXT4_IOC_GETVERSION_OLD:
1160                 return put_user(inode->i_generation, (int __user *) arg);
1161         case EXT4_IOC_SETVERSION:
1162         case EXT4_IOC_SETVERSION_OLD: {
1163                 handle_t *handle;
1164                 struct ext4_iloc iloc;
1165                 __u32 generation;
1166                 int err;
1167
1168                 if (!inode_owner_or_capable(mnt_userns, inode))
1169                         return -EPERM;
1170
1171                 if (ext4_has_metadata_csum(inode->i_sb)) {
1172                         ext4_warning(sb, "Setting inode version is not "
1173                                      "supported with metadata_csum enabled.");
1174                         return -ENOTTY;
1175                 }
1176
1177                 err = mnt_want_write_file(filp);
1178                 if (err)
1179                         return err;
1180                 if (get_user(generation, (int __user *) arg)) {
1181                         err = -EFAULT;
1182                         goto setversion_out;
1183                 }
1184
1185                 inode_lock(inode);
1186                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
1187                 if (IS_ERR(handle)) {
1188                         err = PTR_ERR(handle);
1189                         goto unlock_out;
1190                 }
1191                 err = ext4_reserve_inode_write(handle, inode, &iloc);
1192                 if (err == 0) {
1193                         inode->i_ctime = current_time(inode);
1194                         inode->i_generation = generation;
1195                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
1196                 }
1197                 ext4_journal_stop(handle);
1198
1199 unlock_out:
1200                 inode_unlock(inode);
1201 setversion_out:
1202                 mnt_drop_write_file(filp);
1203                 return err;
1204         }
1205         case EXT4_IOC_GROUP_EXTEND: {
1206                 ext4_fsblk_t n_blocks_count;
1207                 int err, err2=0;
1208
1209                 err = ext4_resize_begin(sb);
1210                 if (err)
1211                         return err;
1212
1213                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
1214                         err = -EFAULT;
1215                         goto group_extend_out;
1216                 }
1217
1218                 if (ext4_has_feature_bigalloc(sb)) {
1219                         ext4_msg(sb, KERN_ERR,
1220                                  "Online resizing not supported with bigalloc");
1221                         err = -EOPNOTSUPP;
1222                         goto group_extend_out;
1223                 }
1224
1225                 err = mnt_want_write_file(filp);
1226                 if (err)
1227                         goto group_extend_out;
1228
1229                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
1230                 if (EXT4_SB(sb)->s_journal) {
1231                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1232                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1233                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1234                 }
1235                 if (err == 0)
1236                         err = err2;
1237                 mnt_drop_write_file(filp);
1238 group_extend_out:
1239                 ext4_resize_end(sb);
1240                 return err;
1241         }
1242
1243         case EXT4_IOC_MOVE_EXT: {
1244                 struct move_extent me;
1245                 struct fd donor;
1246                 int err;
1247
1248                 if (!(filp->f_mode & FMODE_READ) ||
1249                     !(filp->f_mode & FMODE_WRITE))
1250                         return -EBADF;
1251
1252                 if (copy_from_user(&me,
1253                         (struct move_extent __user *)arg, sizeof(me)))
1254                         return -EFAULT;
1255                 me.moved_len = 0;
1256
1257                 donor = fdget(me.donor_fd);
1258                 if (!donor.file)
1259                         return -EBADF;
1260
1261                 if (!(donor.file->f_mode & FMODE_WRITE)) {
1262                         err = -EBADF;
1263                         goto mext_out;
1264                 }
1265
1266                 if (ext4_has_feature_bigalloc(sb)) {
1267                         ext4_msg(sb, KERN_ERR,
1268                                  "Online defrag not supported with bigalloc");
1269                         err = -EOPNOTSUPP;
1270                         goto mext_out;
1271                 } else if (IS_DAX(inode)) {
1272                         ext4_msg(sb, KERN_ERR,
1273                                  "Online defrag not supported with DAX");
1274                         err = -EOPNOTSUPP;
1275                         goto mext_out;
1276                 }
1277
1278                 err = mnt_want_write_file(filp);
1279                 if (err)
1280                         goto mext_out;
1281
1282                 err = ext4_move_extents(filp, donor.file, me.orig_start,
1283                                         me.donor_start, me.len, &me.moved_len);
1284                 mnt_drop_write_file(filp);
1285
1286                 if (copy_to_user((struct move_extent __user *)arg,
1287                                  &me, sizeof(me)))
1288                         err = -EFAULT;
1289 mext_out:
1290                 fdput(donor);
1291                 return err;
1292         }
1293
1294         case EXT4_IOC_GROUP_ADD: {
1295                 struct ext4_new_group_data input;
1296
1297                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
1298                                 sizeof(input)))
1299                         return -EFAULT;
1300
1301                 return ext4_ioctl_group_add(filp, &input);
1302         }
1303
1304         case EXT4_IOC_MIGRATE:
1305         {
1306                 int err;
1307                 if (!inode_owner_or_capable(mnt_userns, inode))
1308                         return -EACCES;
1309
1310                 err = mnt_want_write_file(filp);
1311                 if (err)
1312                         return err;
1313                 /*
1314                  * inode_mutex prevent write and truncate on the file.
1315                  * Read still goes through. We take i_data_sem in
1316                  * ext4_ext_swap_inode_data before we switch the
1317                  * inode format to prevent read.
1318                  */
1319                 inode_lock((inode));
1320                 err = ext4_ext_migrate(inode);
1321                 inode_unlock((inode));
1322                 mnt_drop_write_file(filp);
1323                 return err;
1324         }
1325
1326         case EXT4_IOC_ALLOC_DA_BLKS:
1327         {
1328                 int err;
1329                 if (!inode_owner_or_capable(mnt_userns, inode))
1330                         return -EACCES;
1331
1332                 err = mnt_want_write_file(filp);
1333                 if (err)
1334                         return err;
1335                 err = ext4_alloc_da_blocks(inode);
1336                 mnt_drop_write_file(filp);
1337                 return err;
1338         }
1339
1340         case EXT4_IOC_SWAP_BOOT:
1341         {
1342                 int err;
1343                 if (!(filp->f_mode & FMODE_WRITE))
1344                         return -EBADF;
1345                 err = mnt_want_write_file(filp);
1346                 if (err)
1347                         return err;
1348                 err = swap_inode_boot_loader(sb, mnt_userns, inode);
1349                 mnt_drop_write_file(filp);
1350                 return err;
1351         }
1352
1353         case EXT4_IOC_RESIZE_FS: {
1354                 ext4_fsblk_t n_blocks_count;
1355                 int err = 0, err2 = 0;
1356                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1357
1358                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1359                                    sizeof(__u64))) {
1360                         return -EFAULT;
1361                 }
1362
1363                 err = ext4_resize_begin(sb);
1364                 if (err)
1365                         return err;
1366
1367                 err = mnt_want_write_file(filp);
1368                 if (err)
1369                         goto resizefs_out;
1370
1371                 err = ext4_resize_fs(sb, n_blocks_count);
1372                 if (EXT4_SB(sb)->s_journal) {
1373                         ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL);
1374                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1375                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0);
1376                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1377                 }
1378                 if (err == 0)
1379                         err = err2;
1380                 mnt_drop_write_file(filp);
1381                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1382                     ext4_has_group_desc_csum(sb) &&
1383                     test_opt(sb, INIT_INODE_TABLE))
1384                         err = ext4_register_li_request(sb, o_group);
1385
1386 resizefs_out:
1387                 ext4_resize_end(sb);
1388                 return err;
1389         }
1390
1391         case FITRIM:
1392         {
1393                 struct fstrim_range range;
1394                 int ret = 0;
1395
1396                 if (!capable(CAP_SYS_ADMIN))
1397                         return -EPERM;
1398
1399                 if (!bdev_max_discard_sectors(sb->s_bdev))
1400                         return -EOPNOTSUPP;
1401
1402                 /*
1403                  * We haven't replayed the journal, so we cannot use our
1404                  * block-bitmap-guided storage zapping commands.
1405                  */
1406                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1407                         return -EROFS;
1408
1409                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1410                     sizeof(range)))
1411                         return -EFAULT;
1412
1413                 ret = ext4_trim_fs(sb, &range);
1414                 if (ret < 0)
1415                         return ret;
1416
1417                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1418                     sizeof(range)))
1419                         return -EFAULT;
1420
1421                 return 0;
1422         }
1423         case EXT4_IOC_PRECACHE_EXTENTS:
1424                 return ext4_ext_precache(inode);
1425
1426         case FS_IOC_SET_ENCRYPTION_POLICY:
1427                 if (!ext4_has_feature_encrypt(sb))
1428                         return -EOPNOTSUPP;
1429                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1430
1431         case FS_IOC_GET_ENCRYPTION_PWSALT: {
1432 #ifdef CONFIG_FS_ENCRYPTION
1433                 int err, err2;
1434                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1435                 handle_t *handle;
1436
1437                 if (!ext4_has_feature_encrypt(sb))
1438                         return -EOPNOTSUPP;
1439                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1440                         err = mnt_want_write_file(filp);
1441                         if (err)
1442                                 return err;
1443                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1444                         if (IS_ERR(handle)) {
1445                                 err = PTR_ERR(handle);
1446                                 goto pwsalt_err_exit;
1447                         }
1448                         err = ext4_journal_get_write_access(handle, sb,
1449                                                             sbi->s_sbh,
1450                                                             EXT4_JTR_NONE);
1451                         if (err)
1452                                 goto pwsalt_err_journal;
1453                         lock_buffer(sbi->s_sbh);
1454                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1455                         ext4_superblock_csum_set(sb);
1456                         unlock_buffer(sbi->s_sbh);
1457                         err = ext4_handle_dirty_metadata(handle, NULL,
1458                                                          sbi->s_sbh);
1459                 pwsalt_err_journal:
1460                         err2 = ext4_journal_stop(handle);
1461                         if (err2 && !err)
1462                                 err = err2;
1463                 pwsalt_err_exit:
1464                         mnt_drop_write_file(filp);
1465                         if (err)
1466                                 return err;
1467                 }
1468                 if (copy_to_user((void __user *) arg,
1469                                  sbi->s_es->s_encrypt_pw_salt, 16))
1470                         return -EFAULT;
1471                 return 0;
1472 #else
1473                 return -EOPNOTSUPP;
1474 #endif
1475         }
1476         case FS_IOC_GET_ENCRYPTION_POLICY:
1477                 if (!ext4_has_feature_encrypt(sb))
1478                         return -EOPNOTSUPP;
1479                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1480
1481         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1482                 if (!ext4_has_feature_encrypt(sb))
1483                         return -EOPNOTSUPP;
1484                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1485
1486         case FS_IOC_ADD_ENCRYPTION_KEY:
1487                 if (!ext4_has_feature_encrypt(sb))
1488                         return -EOPNOTSUPP;
1489                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1490
1491         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1492                 if (!ext4_has_feature_encrypt(sb))
1493                         return -EOPNOTSUPP;
1494                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1495
1496         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1497                 if (!ext4_has_feature_encrypt(sb))
1498                         return -EOPNOTSUPP;
1499                 return fscrypt_ioctl_remove_key_all_users(filp,
1500                                                           (void __user *)arg);
1501         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1502                 if (!ext4_has_feature_encrypt(sb))
1503                         return -EOPNOTSUPP;
1504                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1505
1506         case FS_IOC_GET_ENCRYPTION_NONCE:
1507                 if (!ext4_has_feature_encrypt(sb))
1508                         return -EOPNOTSUPP;
1509                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1510
1511         case EXT4_IOC_CLEAR_ES_CACHE:
1512         {
1513                 if (!inode_owner_or_capable(mnt_userns, inode))
1514                         return -EACCES;
1515                 ext4_clear_inode_es(inode);
1516                 return 0;
1517         }
1518
1519         case EXT4_IOC_GETSTATE:
1520         {
1521                 __u32   state = 0;
1522
1523                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1524                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1525                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1526                         state |= EXT4_STATE_FLAG_NEW;
1527                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1528                         state |= EXT4_STATE_FLAG_NEWENTRY;
1529                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1530                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1531
1532                 return put_user(state, (__u32 __user *) arg);
1533         }
1534
1535         case EXT4_IOC_GET_ES_CACHE:
1536                 return ext4_ioctl_get_es_cache(filp, arg);
1537
1538         case EXT4_IOC_SHUTDOWN:
1539                 return ext4_shutdown(sb, arg);
1540
1541         case FS_IOC_ENABLE_VERITY:
1542                 if (!ext4_has_feature_verity(sb))
1543                         return -EOPNOTSUPP;
1544                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1545
1546         case FS_IOC_MEASURE_VERITY:
1547                 if (!ext4_has_feature_verity(sb))
1548                         return -EOPNOTSUPP;
1549                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1550
1551         case FS_IOC_READ_VERITY_METADATA:
1552                 if (!ext4_has_feature_verity(sb))
1553                         return -EOPNOTSUPP;
1554                 return fsverity_ioctl_read_metadata(filp,
1555                                                     (const void __user *)arg);
1556
1557         case EXT4_IOC_CHECKPOINT:
1558                 return ext4_ioctl_checkpoint(filp, arg);
1559
1560         case FS_IOC_GETFSLABEL:
1561                 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg);
1562
1563         case FS_IOC_SETFSLABEL:
1564                 return ext4_ioctl_setlabel(filp,
1565                                            (const void __user *)arg);
1566
1567         default:
1568                 return -ENOTTY;
1569         }
1570 }
1571
1572 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1573 {
1574         return __ext4_ioctl(filp, cmd, arg);
1575 }
1576
1577 #ifdef CONFIG_COMPAT
1578 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1579 {
1580         /* These are just misnamed, they actually get/put from/to user an int */
1581         switch (cmd) {
1582         case EXT4_IOC32_GETVERSION:
1583                 cmd = EXT4_IOC_GETVERSION;
1584                 break;
1585         case EXT4_IOC32_SETVERSION:
1586                 cmd = EXT4_IOC_SETVERSION;
1587                 break;
1588         case EXT4_IOC32_GROUP_EXTEND:
1589                 cmd = EXT4_IOC_GROUP_EXTEND;
1590                 break;
1591         case EXT4_IOC32_GETVERSION_OLD:
1592                 cmd = EXT4_IOC_GETVERSION_OLD;
1593                 break;
1594         case EXT4_IOC32_SETVERSION_OLD:
1595                 cmd = EXT4_IOC_SETVERSION_OLD;
1596                 break;
1597         case EXT4_IOC32_GETRSVSZ:
1598                 cmd = EXT4_IOC_GETRSVSZ;
1599                 break;
1600         case EXT4_IOC32_SETRSVSZ:
1601                 cmd = EXT4_IOC_SETRSVSZ;
1602                 break;
1603         case EXT4_IOC32_GROUP_ADD: {
1604                 struct compat_ext4_new_group_input __user *uinput;
1605                 struct ext4_new_group_data input;
1606                 int err;
1607
1608                 uinput = compat_ptr(arg);
1609                 err = get_user(input.group, &uinput->group);
1610                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1611                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1612                 err |= get_user(input.inode_table, &uinput->inode_table);
1613                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1614                 err |= get_user(input.reserved_blocks,
1615                                 &uinput->reserved_blocks);
1616                 if (err)
1617                         return -EFAULT;
1618                 return ext4_ioctl_group_add(file, &input);
1619         }
1620         case EXT4_IOC_MOVE_EXT:
1621         case EXT4_IOC_RESIZE_FS:
1622         case FITRIM:
1623         case EXT4_IOC_PRECACHE_EXTENTS:
1624         case FS_IOC_SET_ENCRYPTION_POLICY:
1625         case FS_IOC_GET_ENCRYPTION_PWSALT:
1626         case FS_IOC_GET_ENCRYPTION_POLICY:
1627         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1628         case FS_IOC_ADD_ENCRYPTION_KEY:
1629         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1630         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1631         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1632         case FS_IOC_GET_ENCRYPTION_NONCE:
1633         case EXT4_IOC_SHUTDOWN:
1634         case FS_IOC_GETFSMAP:
1635         case FS_IOC_ENABLE_VERITY:
1636         case FS_IOC_MEASURE_VERITY:
1637         case FS_IOC_READ_VERITY_METADATA:
1638         case EXT4_IOC_CLEAR_ES_CACHE:
1639         case EXT4_IOC_GETSTATE:
1640         case EXT4_IOC_GET_ES_CACHE:
1641         case EXT4_IOC_CHECKPOINT:
1642         case FS_IOC_GETFSLABEL:
1643         case FS_IOC_SETFSLABEL:
1644                 break;
1645         default:
1646                 return -ENOIOCTLCMD;
1647         }
1648         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1649 }
1650 #endif