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/uuid.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/delay.h>
  22 #include <linux/iversion.h>
  23 #include "ext4_jbd2.h"
  24 #include "ext4.h"
  25 #include <linux/fsmap.h>
  26 #include "fsmap.h"
  27 #include <trace/events/ext4.h>
  28
  29 /**
  30  * Swap memory between @a and @b for @len bytes.
  31  *
  32  * @a:          pointer to first memory area
  33  * @b:          pointer to second memory area
  34  * @len:        number of bytes to swap
  35  *
  36  */
  37 static void memswap(void *a, void *b, size_t len)
  38 {
  39         unsigned char *ap, *bp;
  40
  41         ap = (unsigned char *)a;
  42         bp = (unsigned char *)b;
  43         while (len-- > 0) {
  44                 swap(*ap, *bp);
  45                 ap++;
  46                 bp++;
  47         }
  48 }
  49
  50 /**
  51  * Swap i_data and associated attributes between @inode1 and @inode2.
  52  * This function is used for the primary swap between inode1 and inode2
  53  * and also to revert this primary swap in case of errors.
  54  *
  55  * Therefore you have to make sure, that calling this method twice
  56  * will revert all changes.
  57  *
  58  * @inode1:     pointer to first inode
  59  * @inode2:     pointer to second inode
  60  */
  61 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  62 {
  63         loff_t isize;
  64         struct ext4_inode_info *ei1;
  65         struct ext4_inode_info *ei2;
  66         unsigned long tmp;
  67
  68         ei1 = EXT4_I(inode1);
  69         ei2 = EXT4_I(inode2);
  70
  71         swap(inode1->i_version, inode2->i_version);
  72         swap(inode1->i_atime, inode2->i_atime);
  73         swap(inode1->i_mtime, inode2->i_mtime);
  74
  75         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  76         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
  77         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
  78                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
  79         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
  80         swap(ei1->i_disksize, ei2->i_disksize);
  81         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  82         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  83
  84         isize = i_size_read(inode1);
  85         i_size_write(inode1, i_size_read(inode2));
  86         i_size_write(inode2, isize);
  87 }
  88
  89 static void reset_inode_seed(struct inode *inode)
  90 {
  91         struct ext4_inode_info *ei = EXT4_I(inode);
  92         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
  93         __le32 inum = cpu_to_le32(inode->i_ino);
  94         __le32 gen = cpu_to_le32(inode->i_generation);
  95         __u32 csum;
  96
  97         if (!ext4_has_metadata_csum(inode->i_sb))
  98                 return;
  99
 100         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 101         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 102 }
 103
 104 /**
 105  * Swap the information from the given @inode and the inode
 106  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 107  * important fields of the inodes.
 108  *
 109  * @sb:         the super block of the filesystem
 110  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 111  *
 112  */
 113 static long swap_inode_boot_loader(struct super_block *sb,
 114                                 struct inode *inode)
 115 {
 116         handle_t *handle;
 117         int err;
 118         struct inode *inode_bl;
 119         struct ext4_inode_info *ei_bl;
 120         qsize_t size, size_bl, diff;
 121         blkcnt_t blocks;
 122         unsigned short bytes;
 123
 124         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 125         if (IS_ERR(inode_bl))
 126                 return PTR_ERR(inode_bl);
 127         ei_bl = EXT4_I(inode_bl);
 128
 129         /* Protect orig inodes against a truncate and make sure,
 130          * that only 1 swap_inode_boot_loader is running. */
 131         lock_two_nondirectories(inode, inode_bl);
 132
 133         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 134             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 135             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 136             ext4_has_inline_data(inode)) {
 137                 err = -EINVAL;
 138                 goto journal_err_out;
 139         }
 140
 141         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 142             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 143                 err = -EPERM;
 144                 goto journal_err_out;
 145         }
 146
 147         down_write(&EXT4_I(inode)->i_mmap_sem);
 148         err = filemap_write_and_wait(inode->i_mapping);
 149         if (err)
 150                 goto err_out;
 151
 152         err = filemap_write_and_wait(inode_bl->i_mapping);
 153         if (err)
 154                 goto err_out;
 155
 156         /* Wait for all existing dio workers */
 157         inode_dio_wait(inode);
 158         inode_dio_wait(inode_bl);
 159
 160         truncate_inode_pages(&inode->i_data, 0);
 161         truncate_inode_pages(&inode_bl->i_data, 0);
 162
 163         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 164         if (IS_ERR(handle)) {
 165                 err = -EINVAL;
 166                 goto err_out;
 167         }
 168
 169         /* Protect extent tree against block allocations via delalloc */
 170         ext4_double_down_write_data_sem(inode, inode_bl);
 171
 172         if (inode_bl->i_nlink == 0) {
 173                 /* this inode has never been used as a BOOT_LOADER */
 174                 set_nlink(inode_bl, 1);
 175                 i_uid_write(inode_bl, 0);
 176                 i_gid_write(inode_bl, 0);
 177                 inode_bl->i_flags = 0;
 178                 ei_bl->i_flags = 0;
 179                 inode_set_iversion(inode_bl, 1);
 180                 i_size_write(inode_bl, 0);
 181                 inode_bl->i_mode = S_IFREG;
 182                 if (ext4_has_feature_extents(sb)) {
 183                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 184                         ext4_ext_tree_init(handle, inode_bl);
 185                 } else
 186                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 187         }
 188
 189         err = dquot_initialize(inode);
 190         if (err)
 191                 goto err_out1;
 192
 193         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 194         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 195         diff = size - size_bl;
 196         swap_inode_data(inode, inode_bl);
 197
 198         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 199
 200         inode->i_generation = prandom_u32();
 201         inode_bl->i_generation = prandom_u32();
 202         reset_inode_seed(inode);
 203         reset_inode_seed(inode_bl);
 204
 205         ext4_discard_preallocations(inode);
 206
 207         err = ext4_mark_inode_dirty(handle, inode);
 208         if (err < 0) {
 209                 /* No need to update quota information. */
 210                 ext4_warning(inode->i_sb,
 211                         "couldn't mark inode #%lu dirty (err %d)",
 212                         inode->i_ino, err);
 213                 /* Revert all changes: */
 214                 swap_inode_data(inode, inode_bl);
 215                 ext4_mark_inode_dirty(handle, inode);
 216                 goto err_out1;
 217         }
 218
 219         blocks = inode_bl->i_blocks;
 220         bytes = inode_bl->i_bytes;
 221         inode_bl->i_blocks = inode->i_blocks;
 222         inode_bl->i_bytes = inode->i_bytes;
 223         err = ext4_mark_inode_dirty(handle, inode_bl);
 224         if (err < 0) {
 225                 /* No need to update quota information. */
 226                 ext4_warning(inode_bl->i_sb,
 227                         "couldn't mark inode #%lu dirty (err %d)",
 228                         inode_bl->i_ino, err);
 229                 goto revert;
 230         }
 231
 232         /* Bootloader inode should not be counted into quota information. */
 233         if (diff > 0)
 234                 dquot_free_space(inode, diff);
 235         else
 236                 err = dquot_alloc_space(inode, -1 * diff);
 237
 238         if (err < 0) {
 239 revert:
 240                 /* Revert all changes: */
 241                 inode_bl->i_blocks = blocks;
 242                 inode_bl->i_bytes = bytes;
 243                 swap_inode_data(inode, inode_bl);
 244                 ext4_mark_inode_dirty(handle, inode);
 245                 ext4_mark_inode_dirty(handle, inode_bl);
 246         }
 247
 248 err_out1:
 249         ext4_journal_stop(handle);
 250         ext4_double_up_write_data_sem(inode, inode_bl);
 251
 252 err_out:
 253         up_write(&EXT4_I(inode)->i_mmap_sem);
 254 journal_err_out:
 255         unlock_two_nondirectories(inode, inode_bl);
 256         iput(inode_bl);
 257         return err;
 258 }
 259
 260 #ifdef CONFIG_FS_ENCRYPTION
 261 static int uuid_is_zero(__u8 u[16])
 262 {
 263         int     i;
 264
 265         for (i = 0; i < 16; i++)
 266                 if (u[i])
 267                         return 0;
 268         return 1;
 269 }
 270 #endif
 271
 272 /*
 273  * If immutable is set and we are not clearing it, we're not allowed to change
 274  * anything else in the inode.  Don't error out if we're only trying to set
 275  * immutable on an immutable file.
 276  */
 277 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 278                                       unsigned int flags)
 279 {
 280         struct ext4_inode_info *ei = EXT4_I(inode);
 281         unsigned int oldflags = ei->i_flags;
 282
 283         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 284                 return 0;
 285
 286         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 287                 return -EPERM;
 288         if (ext4_has_feature_project(inode->i_sb) &&
 289             __kprojid_val(ei->i_projid) != new_projid)
 290                 return -EPERM;
 291
 292         return 0;
 293 }
 294
 295 static int ext4_ioctl_setflags(struct inode *inode,
 296                                unsigned int flags)
 297 {
 298         struct ext4_inode_info *ei = EXT4_I(inode);
 299         handle_t *handle = NULL;
 300         int err = -EPERM, migrate = 0;
 301         struct ext4_iloc iloc;
 302         unsigned int oldflags, mask, i;
 303         unsigned int jflag;
 304         struct super_block *sb = inode->i_sb;
 305
 306         /* Is it quota file? Do not allow user to mess with it */
 307         if (ext4_is_quota_file(inode))
 308                 goto flags_out;
 309
 310         oldflags = ei->i_flags;
 311
 312         /* The JOURNAL_DATA flag is modifiable only by root */
 313         jflag = flags & EXT4_JOURNAL_DATA_FL;
 314
 315         err = vfs_ioc_setflags_prepare(inode, oldflags, flags);
 316         if (err)
 317                 goto flags_out;
 318
 319         /*
 320          * The JOURNAL_DATA flag can only be changed by
 321          * the relevant capability.
 322          */
 323         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 324                 if (!capable(CAP_SYS_RESOURCE))
 325                         goto flags_out;
 326         }
 327         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 328                 migrate = 1;
 329
 330         if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) {
 331                 if (!ext4_has_feature_casefold(sb)) {
 332                         err = -EOPNOTSUPP;
 333                         goto flags_out;
 334                 }
 335
 336                 if (!S_ISDIR(inode->i_mode)) {
 337                         err = -ENOTDIR;
 338                         goto flags_out;
 339                 }
 340
 341                 if (!ext4_empty_dir(inode)) {
 342                         err = -ENOTEMPTY;
 343                         goto flags_out;
 344                 }
 345         }
 346
 347         /*
 348          * Wait for all pending directio and then flush all the dirty pages
 349          * for this file.  The flush marks all the pages readonly, so any
 350          * subsequent attempt to write to the file (particularly mmap pages)
 351          * will come through the filesystem and fail.
 352          */
 353         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 354             (flags & EXT4_IMMUTABLE_FL)) {
 355                 inode_dio_wait(inode);
 356                 err = filemap_write_and_wait(inode->i_mapping);
 357                 if (err)
 358                         goto flags_out;
 359         }
 360
 361         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 362         if (IS_ERR(handle)) {
 363                 err = PTR_ERR(handle);
 364                 goto flags_out;
 365         }
 366         if (IS_SYNC(inode))
 367                 ext4_handle_sync(handle);
 368         err = ext4_reserve_inode_write(handle, inode, &iloc);
 369         if (err)
 370                 goto flags_err;
 371
 372         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 373                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 374                         continue;
 375                 /* These flags get special treatment later */
 376                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 377                         continue;
 378                 if (mask & flags)
 379                         ext4_set_inode_flag(inode, i);
 380                 else
 381                         ext4_clear_inode_flag(inode, i);
 382         }
 383
 384         ext4_set_inode_flags(inode);
 385         inode->i_ctime = current_time(inode);
 386
 387         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 388 flags_err:
 389         ext4_journal_stop(handle);
 390         if (err)
 391                 goto flags_out;
 392
 393         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 394                 /*
 395                  * Changes to the journaling mode can cause unsafe changes to
 396                  * S_DAX if we are using the DAX mount option.
 397                  */
 398                 if (test_opt(inode->i_sb, DAX)) {
 399                         err = -EBUSY;
 400                         goto flags_out;
 401                 }
 402
 403                 err = ext4_change_inode_journal_flag(inode, jflag);
 404                 if (err)
 405                         goto flags_out;
 406         }
 407         if (migrate) {
 408                 if (flags & EXT4_EXTENTS_FL)
 409                         err = ext4_ext_migrate(inode);
 410                 else
 411                         err = ext4_ind_migrate(inode);
 412         }
 413
 414 flags_out:
 415         return err;
 416 }
 417
 418 #ifdef CONFIG_QUOTA
 419 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 420 {
 421         struct inode *inode = file_inode(filp);
 422         struct super_block *sb = inode->i_sb;
 423         struct ext4_inode_info *ei = EXT4_I(inode);
 424         int err, rc;
 425         handle_t *handle;
 426         kprojid_t kprojid;
 427         struct ext4_iloc iloc;
 428         struct ext4_inode *raw_inode;
 429         struct dquot *transfer_to[MAXQUOTAS] = { };
 430
 431         if (!ext4_has_feature_project(sb)) {
 432                 if (projid != EXT4_DEF_PROJID)
 433                         return -EOPNOTSUPP;
 434                 else
 435                         return 0;
 436         }
 437
 438         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 439                 return -EOPNOTSUPP;
 440
 441         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 442
 443         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 444                 return 0;
 445
 446         err = -EPERM;
 447         /* Is it quota file? Do not allow user to mess with it */
 448         if (ext4_is_quota_file(inode))
 449                 return err;
 450
 451         err = ext4_get_inode_loc(inode, &iloc);
 452         if (err)
 453                 return err;
 454
 455         raw_inode = ext4_raw_inode(&iloc);
 456         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 457                 err = ext4_expand_extra_isize(inode,
 458                                               EXT4_SB(sb)->s_want_extra_isize,
 459                                               &iloc);
 460                 if (err)
 461                         return err;
 462         } else {
 463                 brelse(iloc.bh);
 464         }
 465
 466         err = dquot_initialize(inode);
 467         if (err)
 468                 return err;
 469
 470         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 471                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 472                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 473         if (IS_ERR(handle))
 474                 return PTR_ERR(handle);
 475
 476         err = ext4_reserve_inode_write(handle, inode, &iloc);
 477         if (err)
 478                 goto out_stop;
 479
 480         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 481         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 482
 483                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 484                  * counts xattr inode references.
 485                  */
 486                 down_read(&EXT4_I(inode)->xattr_sem);
 487                 err = __dquot_transfer(inode, transfer_to);
 488                 up_read(&EXT4_I(inode)->xattr_sem);
 489                 dqput(transfer_to[PRJQUOTA]);
 490                 if (err)
 491                         goto out_dirty;
 492         }
 493
 494         EXT4_I(inode)->i_projid = kprojid;
 495         inode->i_ctime = current_time(inode);
 496 out_dirty:
 497         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 498         if (!err)
 499                 err = rc;
 500 out_stop:
 501         ext4_journal_stop(handle);
 502         return err;
 503 }
 504 #else
 505 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 506 {
 507         if (projid != EXT4_DEF_PROJID)
 508                 return -EOPNOTSUPP;
 509         return 0;
 510 }
 511 #endif
 512
 513 /* Transfer internal flags to xflags */
 514 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 515 {
 516         __u32 xflags = 0;
 517
 518         if (iflags & EXT4_SYNC_FL)
 519                 xflags |= FS_XFLAG_SYNC;
 520         if (iflags & EXT4_IMMUTABLE_FL)
 521                 xflags |= FS_XFLAG_IMMUTABLE;
 522         if (iflags & EXT4_APPEND_FL)
 523                 xflags |= FS_XFLAG_APPEND;
 524         if (iflags & EXT4_NODUMP_FL)
 525                 xflags |= FS_XFLAG_NODUMP;
 526         if (iflags & EXT4_NOATIME_FL)
 527                 xflags |= FS_XFLAG_NOATIME;
 528         if (iflags & EXT4_PROJINHERIT_FL)
 529                 xflags |= FS_XFLAG_PROJINHERIT;
 530         return xflags;
 531 }
 532
 533 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 534                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 535                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 536
 537 /* Transfer xflags flags to internal */
 538 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 539 {
 540         unsigned long iflags = 0;
 541
 542         if (xflags & FS_XFLAG_SYNC)
 543                 iflags |= EXT4_SYNC_FL;
 544         if (xflags & FS_XFLAG_IMMUTABLE)
 545                 iflags |= EXT4_IMMUTABLE_FL;
 546         if (xflags & FS_XFLAG_APPEND)
 547                 iflags |= EXT4_APPEND_FL;
 548         if (xflags & FS_XFLAG_NODUMP)
 549                 iflags |= EXT4_NODUMP_FL;
 550         if (xflags & FS_XFLAG_NOATIME)
 551                 iflags |= EXT4_NOATIME_FL;
 552         if (xflags & FS_XFLAG_PROJINHERIT)
 553                 iflags |= EXT4_PROJINHERIT_FL;
 554
 555         return iflags;
 556 }
 557
 558 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 559 {
 560         struct ext4_sb_info *sbi = EXT4_SB(sb);
 561         __u32 flags;
 562
 563         if (!capable(CAP_SYS_ADMIN))
 564                 return -EPERM;
 565
 566         if (get_user(flags, (__u32 __user *)arg))
 567                 return -EFAULT;
 568
 569         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 570                 return -EINVAL;
 571
 572         if (ext4_forced_shutdown(sbi))
 573                 return 0;
 574
 575         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 576         trace_ext4_shutdown(sb, flags);
 577
 578         switch (flags) {
 579         case EXT4_GOING_FLAGS_DEFAULT:
 580                 freeze_bdev(sb->s_bdev);
 581                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 582                 thaw_bdev(sb->s_bdev, sb);
 583                 break;
 584         case EXT4_GOING_FLAGS_LOGFLUSH:
 585                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 586                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 587                         (void) ext4_force_commit(sb);
 588                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 589                 }
 590                 break;
 591         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 592                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 593                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 594                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 595                 break;
 596         default:
 597                 return -EINVAL;
 598         }
 599         clear_opt(sb, DISCARD);
 600         return 0;
 601 }
 602
 603 struct getfsmap_info {
 604         struct super_block      *gi_sb;
 605         struct fsmap_head __user *gi_data;
 606         unsigned int            gi_idx;
 607         __u32                   gi_last_flags;
 608 };
 609
 610 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 611 {
 612         struct getfsmap_info *info = priv;
 613         struct fsmap fm;
 614
 615         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 616
 617         info->gi_last_flags = xfm->fmr_flags;
 618         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 619         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 620                         sizeof(struct fsmap)))
 621                 return -EFAULT;
 622
 623         return 0;
 624 }
 625
 626 static int ext4_ioc_getfsmap(struct super_block *sb,
 627                              struct fsmap_head __user *arg)
 628 {
 629         struct getfsmap_info info = { NULL };
 630         struct ext4_fsmap_head xhead = {0};
 631         struct fsmap_head head;
 632         bool aborted = false;
 633         int error;
 634
 635         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 636                 return -EFAULT;
 637         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 638             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 639                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 640             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 641                        sizeof(head.fmh_keys[1].fmr_reserved)))
 642                 return -EINVAL;
 643         /*
 644          * ext4 doesn't report file extents at all, so the only valid
 645          * file offsets are the magic ones (all zeroes or all ones).
 646          */
 647         if (head.fmh_keys[0].fmr_offset ||
 648             (head.fmh_keys[1].fmr_offset != 0 &&
 649              head.fmh_keys[1].fmr_offset != -1ULL))
 650                 return -EINVAL;
 651
 652         xhead.fmh_iflags = head.fmh_iflags;
 653         xhead.fmh_count = head.fmh_count;
 654         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 655         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 656
 657         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 658         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 659
 660         info.gi_sb = sb;
 661         info.gi_data = arg;
 662         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 663         if (error == EXT4_QUERY_RANGE_ABORT) {
 664                 error = 0;
 665                 aborted = true;
 666         } else if (error)
 667                 return error;
 668
 669         /* If we didn't abort, set the "last" flag in the last fmx */
 670         if (!aborted && info.gi_idx) {
 671                 info.gi_last_flags |= FMR_OF_LAST;
 672                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 673                                  &info.gi_last_flags,
 674                                  sizeof(info.gi_last_flags)))
 675                         return -EFAULT;
 676         }
 677
 678         /* copy back header */
 679         head.fmh_entries = xhead.fmh_entries;
 680         head.fmh_oflags = xhead.fmh_oflags;
 681         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 682                 return -EFAULT;
 683
 684         return 0;
 685 }
 686
 687 static long ext4_ioctl_group_add(struct file *file,
 688                                  struct ext4_new_group_data *input)
 689 {
 690         struct super_block *sb = file_inode(file)->i_sb;
 691         int err, err2=0;
 692
 693         err = ext4_resize_begin(sb);
 694         if (err)
 695                 return err;
 696
 697         if (ext4_has_feature_bigalloc(sb)) {
 698                 ext4_msg(sb, KERN_ERR,
 699                          "Online resizing not supported with bigalloc");
 700                 err = -EOPNOTSUPP;
 701                 goto group_add_out;
 702         }
 703
 704         err = mnt_want_write_file(file);
 705         if (err)
 706                 goto group_add_out;
 707
 708         err = ext4_group_add(sb, input);
 709         if (EXT4_SB(sb)->s_journal) {
 710                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 711                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 712                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 713         }
 714         if (err == 0)
 715                 err = err2;
 716         mnt_drop_write_file(file);
 717         if (!err && ext4_has_group_desc_csum(sb) &&
 718             test_opt(sb, INIT_INODE_TABLE))
 719                 err = ext4_register_li_request(sb, input->group);
 720 group_add_out:
 721         ext4_resize_end(sb);
 722         return err;
 723 }
 724
 725 static void ext4_fill_fsxattr(struct inode *inode, struct fsxattr *fa)
 726 {
 727         struct ext4_inode_info *ei = EXT4_I(inode);
 728
 729         simple_fill_fsxattr(fa, ext4_iflags_to_xflags(ei->i_flags &
 730                                                       EXT4_FL_USER_VISIBLE));
 731
 732         if (ext4_has_feature_project(inode->i_sb))
 733                 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid);
 734 }
 735
 736 /* So that the fiemap access checks can't overflow on 32 bit machines. */
 737 #define FIEMAP_MAX_EXTENTS      (UINT_MAX / sizeof(struct fiemap_extent))
 738
 739 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg)
 740 {
 741         struct fiemap fiemap;
 742         struct fiemap __user *ufiemap = (struct fiemap __user *) arg;
 743         struct fiemap_extent_info fieinfo = { 0, };
 744         struct inode *inode = file_inode(filp);
 745         int error;
 746
 747         if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap)))
 748                 return -EFAULT;
 749
 750         if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS)
 751                 return -EINVAL;
 752
 753         fieinfo.fi_flags = fiemap.fm_flags;
 754         fieinfo.fi_extents_max = fiemap.fm_extent_count;
 755         fieinfo.fi_extents_start = ufiemap->fm_extents;
 756
 757         if (fiemap.fm_extent_count != 0 &&
 758             !access_ok(fieinfo.fi_extents_start,
 759                        fieinfo.fi_extents_max * sizeof(struct fiemap_extent)))
 760                 return -EFAULT;
 761
 762         if (fieinfo.fi_flags & FIEMAP_FLAG_SYNC)
 763                 filemap_write_and_wait(inode->i_mapping);
 764
 765         error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start,
 766                         fiemap.fm_length);
 767         fiemap.fm_flags = fieinfo.fi_flags;
 768         fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped;
 769         if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap)))
 770                 error = -EFAULT;
 771
 772         return error;
 773 }
 774
 775 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 776 {
 777         struct inode *inode = file_inode(filp);
 778         struct super_block *sb = inode->i_sb;
 779         struct ext4_inode_info *ei = EXT4_I(inode);
 780         unsigned int flags;
 781
 782         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 783
 784         switch (cmd) {
 785         case FS_IOC_GETFSMAP:
 786                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 787         case EXT4_IOC_GETFLAGS:
 788                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 789                 if (S_ISREG(inode->i_mode))
 790                         flags &= ~EXT4_PROJINHERIT_FL;
 791                 return put_user(flags, (int __user *) arg);
 792         case EXT4_IOC_SETFLAGS: {
 793                 int err;
 794
 795                 if (!inode_owner_or_capable(inode))
 796                         return -EACCES;
 797
 798                 if (get_user(flags, (int __user *) arg))
 799                         return -EFAULT;
 800
 801                 if (flags & ~EXT4_FL_USER_VISIBLE)
 802                         return -EOPNOTSUPP;
 803                 /*
 804                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 805                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 806                  * more restrictive than just silently masking off visible but
 807                  * not settable flags as we always did.
 808                  */
 809                 flags &= EXT4_FL_USER_MODIFIABLE;
 810                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 811                         return -EOPNOTSUPP;
 812
 813                 err = mnt_want_write_file(filp);
 814                 if (err)
 815                         return err;
 816
 817                 inode_lock(inode);
 818                 err = ext4_ioctl_check_immutable(inode,
 819                                 from_kprojid(&init_user_ns, ei->i_projid),
 820                                 flags);
 821                 if (!err)
 822                         err = ext4_ioctl_setflags(inode, flags);
 823                 inode_unlock(inode);
 824                 mnt_drop_write_file(filp);
 825                 return err;
 826         }
 827         case EXT4_IOC_GETVERSION:
 828         case EXT4_IOC_GETVERSION_OLD:
 829                 return put_user(inode->i_generation, (int __user *) arg);
 830         case EXT4_IOC_SETVERSION:
 831         case EXT4_IOC_SETVERSION_OLD: {
 832                 handle_t *handle;
 833                 struct ext4_iloc iloc;
 834                 __u32 generation;
 835                 int err;
 836
 837                 if (!inode_owner_or_capable(inode))
 838                         return -EPERM;
 839
 840                 if (ext4_has_metadata_csum(inode->i_sb)) {
 841                         ext4_warning(sb, "Setting inode version is not "
 842                                      "supported with metadata_csum enabled.");
 843                         return -ENOTTY;
 844                 }
 845
 846                 err = mnt_want_write_file(filp);
 847                 if (err)
 848                         return err;
 849                 if (get_user(generation, (int __user *) arg)) {
 850                         err = -EFAULT;
 851                         goto setversion_out;
 852                 }
 853
 854                 inode_lock(inode);
 855                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 856                 if (IS_ERR(handle)) {
 857                         err = PTR_ERR(handle);
 858                         goto unlock_out;
 859                 }
 860                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 861                 if (err == 0) {
 862                         inode->i_ctime = current_time(inode);
 863                         inode->i_generation = generation;
 864                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 865                 }
 866                 ext4_journal_stop(handle);
 867
 868 unlock_out:
 869                 inode_unlock(inode);
 870 setversion_out:
 871                 mnt_drop_write_file(filp);
 872                 return err;
 873         }
 874         case EXT4_IOC_GROUP_EXTEND: {
 875                 ext4_fsblk_t n_blocks_count;
 876                 int err, err2=0;
 877
 878                 err = ext4_resize_begin(sb);
 879                 if (err)
 880                         return err;
 881
 882                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 883                         err = -EFAULT;
 884                         goto group_extend_out;
 885                 }
 886
 887                 if (ext4_has_feature_bigalloc(sb)) {
 888                         ext4_msg(sb, KERN_ERR,
 889                                  "Online resizing not supported with bigalloc");
 890                         err = -EOPNOTSUPP;
 891                         goto group_extend_out;
 892                 }
 893
 894                 err = mnt_want_write_file(filp);
 895                 if (err)
 896                         goto group_extend_out;
 897
 898                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 899                 if (EXT4_SB(sb)->s_journal) {
 900                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 901                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 902                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 903                 }
 904                 if (err == 0)
 905                         err = err2;
 906                 mnt_drop_write_file(filp);
 907 group_extend_out:
 908                 ext4_resize_end(sb);
 909                 return err;
 910         }
 911
 912         case EXT4_IOC_MOVE_EXT: {
 913                 struct move_extent me;
 914                 struct fd donor;
 915                 int err;
 916
 917                 if (!(filp->f_mode & FMODE_READ) ||
 918                     !(filp->f_mode & FMODE_WRITE))
 919                         return -EBADF;
 920
 921                 if (copy_from_user(&me,
 922                         (struct move_extent __user *)arg, sizeof(me)))
 923                         return -EFAULT;
 924                 me.moved_len = 0;
 925
 926                 donor = fdget(me.donor_fd);
 927                 if (!donor.file)
 928                         return -EBADF;
 929
 930                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 931                         err = -EBADF;
 932                         goto mext_out;
 933                 }
 934
 935                 if (ext4_has_feature_bigalloc(sb)) {
 936                         ext4_msg(sb, KERN_ERR,
 937                                  "Online defrag not supported with bigalloc");
 938                         err = -EOPNOTSUPP;
 939                         goto mext_out;
 940                 } else if (IS_DAX(inode)) {
 941                         ext4_msg(sb, KERN_ERR,
 942                                  "Online defrag not supported with DAX");
 943                         err = -EOPNOTSUPP;
 944                         goto mext_out;
 945                 }
 946
 947                 err = mnt_want_write_file(filp);
 948                 if (err)
 949                         goto mext_out;
 950
 951                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 952                                         me.donor_start, me.len, &me.moved_len);
 953                 mnt_drop_write_file(filp);
 954
 955                 if (copy_to_user((struct move_extent __user *)arg,
 956                                  &me, sizeof(me)))
 957                         err = -EFAULT;
 958 mext_out:
 959                 fdput(donor);
 960                 return err;
 961         }
 962
 963         case EXT4_IOC_GROUP_ADD: {
 964                 struct ext4_new_group_data input;
 965
 966                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 967                                 sizeof(input)))
 968                         return -EFAULT;
 969
 970                 return ext4_ioctl_group_add(filp, &input);
 971         }
 972
 973         case EXT4_IOC_MIGRATE:
 974         {
 975                 int err;
 976                 if (!inode_owner_or_capable(inode))
 977                         return -EACCES;
 978
 979                 err = mnt_want_write_file(filp);
 980                 if (err)
 981                         return err;
 982                 /*
 983                  * inode_mutex prevent write and truncate on the file.
 984                  * Read still goes through. We take i_data_sem in
 985                  * ext4_ext_swap_inode_data before we switch the
 986                  * inode format to prevent read.
 987                  */
 988                 inode_lock((inode));
 989                 err = ext4_ext_migrate(inode);
 990                 inode_unlock((inode));
 991                 mnt_drop_write_file(filp);
 992                 return err;
 993         }
 994
 995         case EXT4_IOC_ALLOC_DA_BLKS:
 996         {
 997                 int err;
 998                 if (!inode_owner_or_capable(inode))
 999                         return -EACCES;
1000
1001                 err = mnt_want_write_file(filp);
1002                 if (err)
1003                         return err;
1004                 err = ext4_alloc_da_blocks(inode);
1005                 mnt_drop_write_file(filp);
1006                 return err;
1007         }
1008
1009         case EXT4_IOC_SWAP_BOOT:
1010         {
1011                 int err;
1012                 if (!(filp->f_mode & FMODE_WRITE))
1013                         return -EBADF;
1014                 err = mnt_want_write_file(filp);
1015                 if (err)
1016                         return err;
1017                 err = swap_inode_boot_loader(sb, inode);
1018                 mnt_drop_write_file(filp);
1019                 return err;
1020         }
1021
1022         case EXT4_IOC_RESIZE_FS: {
1023                 ext4_fsblk_t n_blocks_count;
1024                 int err = 0, err2 = 0;
1025                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
1026
1027                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
1028                                    sizeof(__u64))) {
1029                         return -EFAULT;
1030                 }
1031
1032                 err = ext4_resize_begin(sb);
1033                 if (err)
1034                         return err;
1035
1036                 err = mnt_want_write_file(filp);
1037                 if (err)
1038                         goto resizefs_out;
1039
1040                 err = ext4_resize_fs(sb, n_blocks_count);
1041                 if (EXT4_SB(sb)->s_journal) {
1042                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
1043                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
1044                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
1045                 }
1046                 if (err == 0)
1047                         err = err2;
1048                 mnt_drop_write_file(filp);
1049                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
1050                     ext4_has_group_desc_csum(sb) &&
1051                     test_opt(sb, INIT_INODE_TABLE))
1052                         err = ext4_register_li_request(sb, o_group);
1053
1054 resizefs_out:
1055                 ext4_resize_end(sb);
1056                 return err;
1057         }
1058
1059         case FITRIM:
1060         {
1061                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1062                 struct fstrim_range range;
1063                 int ret = 0;
1064
1065                 if (!capable(CAP_SYS_ADMIN))
1066                         return -EPERM;
1067
1068                 if (!blk_queue_discard(q))
1069                         return -EOPNOTSUPP;
1070
1071                 /*
1072                  * We haven't replayed the journal, so we cannot use our
1073                  * block-bitmap-guided storage zapping commands.
1074                  */
1075                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
1076                         return -EROFS;
1077
1078                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1079                     sizeof(range)))
1080                         return -EFAULT;
1081
1082                 range.minlen = max((unsigned int)range.minlen,
1083                                    q->limits.discard_granularity);
1084                 ret = ext4_trim_fs(sb, &range);
1085                 if (ret < 0)
1086                         return ret;
1087
1088                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1089                     sizeof(range)))
1090                         return -EFAULT;
1091
1092                 return 0;
1093         }
1094         case EXT4_IOC_PRECACHE_EXTENTS:
1095                 return ext4_ext_precache(inode);
1096
1097         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1098                 if (!ext4_has_feature_encrypt(sb))
1099                         return -EOPNOTSUPP;
1100                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1101
1102         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1103 #ifdef CONFIG_FS_ENCRYPTION
1104                 int err, err2;
1105                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1106                 handle_t *handle;
1107
1108                 if (!ext4_has_feature_encrypt(sb))
1109                         return -EOPNOTSUPP;
1110                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1111                         err = mnt_want_write_file(filp);
1112                         if (err)
1113                                 return err;
1114                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1115                         if (IS_ERR(handle)) {
1116                                 err = PTR_ERR(handle);
1117                                 goto pwsalt_err_exit;
1118                         }
1119                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1120                         if (err)
1121                                 goto pwsalt_err_journal;
1122                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1123                         err = ext4_handle_dirty_metadata(handle, NULL,
1124                                                          sbi->s_sbh);
1125                 pwsalt_err_journal:
1126                         err2 = ext4_journal_stop(handle);
1127                         if (err2 && !err)
1128                                 err = err2;
1129                 pwsalt_err_exit:
1130                         mnt_drop_write_file(filp);
1131                         if (err)
1132                                 return err;
1133                 }
1134                 if (copy_to_user((void __user *) arg,
1135                                  sbi->s_es->s_encrypt_pw_salt, 16))
1136                         return -EFAULT;
1137                 return 0;
1138 #else
1139                 return -EOPNOTSUPP;
1140 #endif
1141         }
1142         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1143                 if (!ext4_has_feature_encrypt(sb))
1144                         return -EOPNOTSUPP;
1145                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1146
1147         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1148                 if (!ext4_has_feature_encrypt(sb))
1149                         return -EOPNOTSUPP;
1150                 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg);
1151
1152         case FS_IOC_ADD_ENCRYPTION_KEY:
1153                 if (!ext4_has_feature_encrypt(sb))
1154                         return -EOPNOTSUPP;
1155                 return fscrypt_ioctl_add_key(filp, (void __user *)arg);
1156
1157         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1158                 if (!ext4_has_feature_encrypt(sb))
1159                         return -EOPNOTSUPP;
1160                 return fscrypt_ioctl_remove_key(filp, (void __user *)arg);
1161
1162         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1163                 if (!ext4_has_feature_encrypt(sb))
1164                         return -EOPNOTSUPP;
1165                 return fscrypt_ioctl_remove_key_all_users(filp,
1166                                                           (void __user *)arg);
1167         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1168                 if (!ext4_has_feature_encrypt(sb))
1169                         return -EOPNOTSUPP;
1170                 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg);
1171
1172         case FS_IOC_GET_ENCRYPTION_NONCE:
1173                 if (!ext4_has_feature_encrypt(sb))
1174                         return -EOPNOTSUPP;
1175                 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg);
1176
1177         case EXT4_IOC_CLEAR_ES_CACHE:
1178         {
1179                 if (!inode_owner_or_capable(inode))
1180                         return -EACCES;
1181                 ext4_clear_inode_es(inode);
1182                 return 0;
1183         }
1184
1185         case EXT4_IOC_GETSTATE:
1186         {
1187                 __u32   state = 0;
1188
1189                 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED))
1190                         state |= EXT4_STATE_FLAG_EXT_PRECACHED;
1191                 if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
1192                         state |= EXT4_STATE_FLAG_NEW;
1193                 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY))
1194                         state |= EXT4_STATE_FLAG_NEWENTRY;
1195                 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE))
1196                         state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE;
1197
1198                 return put_user(state, (__u32 __user *) arg);
1199         }
1200
1201         case EXT4_IOC_GET_ES_CACHE:
1202                 return ext4_ioctl_get_es_cache(filp, arg);
1203
1204         case EXT4_IOC_FSGETXATTR:
1205         {
1206                 struct fsxattr fa;
1207
1208                 ext4_fill_fsxattr(inode, &fa);
1209
1210                 if (copy_to_user((struct fsxattr __user *)arg,
1211                                  &fa, sizeof(fa)))
1212                         return -EFAULT;
1213                 return 0;
1214         }
1215         case EXT4_IOC_FSSETXATTR:
1216         {
1217                 struct fsxattr fa, old_fa;
1218                 int err;
1219
1220                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1221                                    sizeof(fa)))
1222                         return -EFAULT;
1223
1224                 /* Make sure caller has proper permission */
1225                 if (!inode_owner_or_capable(inode))
1226                         return -EACCES;
1227
1228                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1229                         return -EOPNOTSUPP;
1230
1231                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1232                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1233                         return -EOPNOTSUPP;
1234
1235                 err = mnt_want_write_file(filp);
1236                 if (err)
1237                         return err;
1238
1239                 inode_lock(inode);
1240                 ext4_fill_fsxattr(inode, &old_fa);
1241                 err = vfs_ioc_fssetxattr_check(inode, &old_fa, &fa);
1242                 if (err)
1243                         goto out;
1244                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1245                          (flags & EXT4_FL_XFLAG_VISIBLE);
1246                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1247                 if (err)
1248                         goto out;
1249                 err = ext4_ioctl_setflags(inode, flags);
1250                 if (err)
1251                         goto out;
1252                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1253 out:
1254                 inode_unlock(inode);
1255                 mnt_drop_write_file(filp);
1256                 return err;
1257         }
1258         case EXT4_IOC_SHUTDOWN:
1259                 return ext4_shutdown(sb, arg);
1260
1261         case FS_IOC_ENABLE_VERITY:
1262                 if (!ext4_has_feature_verity(sb))
1263                         return -EOPNOTSUPP;
1264                 return fsverity_ioctl_enable(filp, (const void __user *)arg);
1265
1266         case FS_IOC_MEASURE_VERITY:
1267                 if (!ext4_has_feature_verity(sb))
1268                         return -EOPNOTSUPP;
1269                 return fsverity_ioctl_measure(filp, (void __user *)arg);
1270
1271         default:
1272                 return -ENOTTY;
1273         }
1274 }
1275
1276 #ifdef CONFIG_COMPAT
1277 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1278 {
1279         /* These are just misnamed, they actually get/put from/to user an int */
1280         switch (cmd) {
1281         case EXT4_IOC32_GETFLAGS:
1282                 cmd = EXT4_IOC_GETFLAGS;
1283                 break;
1284         case EXT4_IOC32_SETFLAGS:
1285                 cmd = EXT4_IOC_SETFLAGS;
1286                 break;
1287         case EXT4_IOC32_GETVERSION:
1288                 cmd = EXT4_IOC_GETVERSION;
1289                 break;
1290         case EXT4_IOC32_SETVERSION:
1291                 cmd = EXT4_IOC_SETVERSION;
1292                 break;
1293         case EXT4_IOC32_GROUP_EXTEND:
1294                 cmd = EXT4_IOC_GROUP_EXTEND;
1295                 break;
1296         case EXT4_IOC32_GETVERSION_OLD:
1297                 cmd = EXT4_IOC_GETVERSION_OLD;
1298                 break;
1299         case EXT4_IOC32_SETVERSION_OLD:
1300                 cmd = EXT4_IOC_SETVERSION_OLD;
1301                 break;
1302         case EXT4_IOC32_GETRSVSZ:
1303                 cmd = EXT4_IOC_GETRSVSZ;
1304                 break;
1305         case EXT4_IOC32_SETRSVSZ:
1306                 cmd = EXT4_IOC_SETRSVSZ;
1307                 break;
1308         case EXT4_IOC32_GROUP_ADD: {
1309                 struct compat_ext4_new_group_input __user *uinput;
1310                 struct ext4_new_group_data input;
1311                 int err;
1312
1313                 uinput = compat_ptr(arg);
1314                 err = get_user(input.group, &uinput->group);
1315                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1316                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1317                 err |= get_user(input.inode_table, &uinput->inode_table);
1318                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1319                 err |= get_user(input.reserved_blocks,
1320                                 &uinput->reserved_blocks);
1321                 if (err)
1322                         return -EFAULT;
1323                 return ext4_ioctl_group_add(file, &input);
1324         }
1325         case EXT4_IOC_MOVE_EXT:
1326         case EXT4_IOC_RESIZE_FS:
1327         case FITRIM:
1328         case EXT4_IOC_PRECACHE_EXTENTS:
1329         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1330         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1331         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1332         case FS_IOC_GET_ENCRYPTION_POLICY_EX:
1333         case FS_IOC_ADD_ENCRYPTION_KEY:
1334         case FS_IOC_REMOVE_ENCRYPTION_KEY:
1335         case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS:
1336         case FS_IOC_GET_ENCRYPTION_KEY_STATUS:
1337         case FS_IOC_GET_ENCRYPTION_NONCE:
1338         case EXT4_IOC_SHUTDOWN:
1339         case FS_IOC_GETFSMAP:
1340         case FS_IOC_ENABLE_VERITY:
1341         case FS_IOC_MEASURE_VERITY:
1342         case EXT4_IOC_CLEAR_ES_CACHE:
1343         case EXT4_IOC_GETSTATE:
1344         case EXT4_IOC_GET_ES_CACHE:
1345         case EXT4_IOC_FSGETXATTR:
1346         case EXT4_IOC_FSSETXATTR:
1347                 break;
1348         default:
1349                 return -ENOIOCTLCMD;
1350         }
1351         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1352 }
1353 #endif