fs/ext4/ioctl.c

   1 /*
   2  * linux/fs/ext4/ioctl.c
   3  *
   4  * Copyright (C) 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  */
   9
  10 #include <linux/fs.h>
  11 #include <linux/capability.h>
  12 #include <linux/time.h>
  13 #include <linux/compat.h>
  14 #include <linux/mount.h>
  15 #include <linux/file.h>
  16 #include <linux/quotaops.h>
  17 #include <linux/uuid.h>
  18 #include <asm/uaccess.h>
  19 #include "ext4_jbd2.h"
  20 #include "ext4.h"
  21
  22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1)
  23
  24 /**
  25  * Swap memory between @a and @b for @len bytes.
  26  *
  27  * @a:          pointer to first memory area
  28  * @b:          pointer to second memory area
  29  * @len:        number of bytes to swap
  30  *
  31  */
  32 static void memswap(void *a, void *b, size_t len)
  33 {
  34         unsigned char *ap, *bp;
  35
  36         ap = (unsigned char *)a;
  37         bp = (unsigned char *)b;
  38         while (len-- > 0) {
  39                 swap(*ap, *bp);
  40                 ap++;
  41                 bp++;
  42         }
  43 }
  44
  45 /**
  46  * Swap i_data and associated attributes between @inode1 and @inode2.
  47  * This function is used for the primary swap between inode1 and inode2
  48  * and also to revert this primary swap in case of errors.
  49  *
  50  * Therefore you have to make sure, that calling this method twice
  51  * will revert all changes.
  52  *
  53  * @inode1:     pointer to first inode
  54  * @inode2:     pointer to second inode
  55  */
  56 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  57 {
  58         loff_t isize;
  59         struct ext4_inode_info *ei1;
  60         struct ext4_inode_info *ei2;
  61
  62         ei1 = EXT4_I(inode1);
  63         ei2 = EXT4_I(inode2);
  64
  65         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  66         memswap(&inode1->i_version, &inode2->i_version,
  67                   sizeof(inode1->i_version));
  68         memswap(&inode1->i_blocks, &inode2->i_blocks,
  69                   sizeof(inode1->i_blocks));
  70         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  71         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  72         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  73
  74         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  75         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  76         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  77         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  78         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  79
  80         isize = i_size_read(inode1);
  81         i_size_write(inode1, i_size_read(inode2));
  82         i_size_write(inode2, isize);
  83 }
  84
  85 /**
  86  * Swap the information from the given @inode and the inode
  87  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  88  * important fields of the inodes.
  89  *
  90  * @sb:         the super block of the filesystem
  91  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  92  *
  93  */
  94 static long swap_inode_boot_loader(struct super_block *sb,
  95                                 struct inode *inode)
  96 {
  97         handle_t *handle;
  98         int err;
  99         struct inode *inode_bl;
 100         struct ext4_inode_info *ei_bl;
 101         struct ext4_sb_info *sbi = EXT4_SB(sb);
 102
 103         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 104                 return -EINVAL;
 105
 106         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 107                 return -EPERM;
 108
 109         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 110         if (IS_ERR(inode_bl))
 111                 return PTR_ERR(inode_bl);
 112         ei_bl = EXT4_I(inode_bl);
 113
 114         filemap_flush(inode->i_mapping);
 115         filemap_flush(inode_bl->i_mapping);
 116
 117         /* Protect orig inodes against a truncate and make sure,
 118          * that only 1 swap_inode_boot_loader is running. */
 119         lock_two_nondirectories(inode, inode_bl);
 120
 121         truncate_inode_pages(&inode->i_data, 0);
 122         truncate_inode_pages(&inode_bl->i_data, 0);
 123
 124         /* Wait for all existing dio workers */
 125         ext4_inode_block_unlocked_dio(inode);
 126         ext4_inode_block_unlocked_dio(inode_bl);
 127         inode_dio_wait(inode);
 128         inode_dio_wait(inode_bl);
 129
 130         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 131         if (IS_ERR(handle)) {
 132                 err = -EINVAL;
 133                 goto journal_err_out;
 134         }
 135
 136         /* Protect extent tree against block allocations via delalloc */
 137         ext4_double_down_write_data_sem(inode, inode_bl);
 138
 139         if (inode_bl->i_nlink == 0) {
 140                 /* this inode has never been used as a BOOT_LOADER */
 141                 set_nlink(inode_bl, 1);
 142                 i_uid_write(inode_bl, 0);
 143                 i_gid_write(inode_bl, 0);
 144                 inode_bl->i_flags = 0;
 145                 ei_bl->i_flags = 0;
 146                 inode_bl->i_version = 1;
 147                 i_size_write(inode_bl, 0);
 148                 inode_bl->i_mode = S_IFREG;
 149                 if (ext4_has_feature_extents(sb)) {
 150                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 151                         ext4_ext_tree_init(handle, inode_bl);
 152                 } else
 153                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 154         }
 155
 156         swap_inode_data(inode, inode_bl);
 157
 158         inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode);
 159
 160         spin_lock(&sbi->s_next_gen_lock);
 161         inode->i_generation = sbi->s_next_generation++;
 162         inode_bl->i_generation = sbi->s_next_generation++;
 163         spin_unlock(&sbi->s_next_gen_lock);
 164
 165         ext4_discard_preallocations(inode);
 166
 167         err = ext4_mark_inode_dirty(handle, inode);
 168         if (err < 0) {
 169                 ext4_warning(inode->i_sb,
 170                         "couldn't mark inode #%lu dirty (err %d)",
 171                         inode->i_ino, err);
 172                 /* Revert all changes: */
 173                 swap_inode_data(inode, inode_bl);
 174         } else {
 175                 err = ext4_mark_inode_dirty(handle, inode_bl);
 176                 if (err < 0) {
 177                         ext4_warning(inode_bl->i_sb,
 178                                 "couldn't mark inode #%lu dirty (err %d)",
 179                                 inode_bl->i_ino, err);
 180                         /* Revert all changes: */
 181                         swap_inode_data(inode, inode_bl);
 182                         ext4_mark_inode_dirty(handle, inode);
 183                 }
 184         }
 185         ext4_journal_stop(handle);
 186         ext4_double_up_write_data_sem(inode, inode_bl);
 187
 188 journal_err_out:
 189         ext4_inode_resume_unlocked_dio(inode);
 190         ext4_inode_resume_unlocked_dio(inode_bl);
 191         unlock_two_nondirectories(inode, inode_bl);
 192         iput(inode_bl);
 193         return err;
 194 }
 195
 196 static int uuid_is_zero(__u8 u[16])
 197 {
 198         int     i;
 199
 200         for (i = 0; i < 16; i++)
 201                 if (u[i])
 202                         return 0;
 203         return 1;
 204 }
 205
 206 static int ext4_ioctl_setflags(struct inode *inode,
 207                                unsigned int flags)
 208 {
 209         struct ext4_inode_info *ei = EXT4_I(inode);
 210         handle_t *handle = NULL;
 211         int err = -EPERM, migrate = 0;
 212         struct ext4_iloc iloc;
 213         unsigned int oldflags, mask, i;
 214         unsigned int jflag;
 215
 216         /* Is it quota file? Do not allow user to mess with it */
 217         if (IS_NOQUOTA(inode))
 218                 goto flags_out;
 219
 220         oldflags = ei->i_flags;
 221
 222         /* The JOURNAL_DATA flag is modifiable only by root */
 223         jflag = flags & EXT4_JOURNAL_DATA_FL;
 224
 225         /*
 226          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 227          * the relevant capability.
 228          *
 229          * This test looks nicer. Thanks to Pauline Middelink
 230          */
 231         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 232                 if (!capable(CAP_LINUX_IMMUTABLE))
 233                         goto flags_out;
 234         }
 235
 236         /*
 237          * The JOURNAL_DATA flag can only be changed by
 238          * the relevant capability.
 239          */
 240         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 241                 if (!capable(CAP_SYS_RESOURCE))
 242                         goto flags_out;
 243         }
 244         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 245                 migrate = 1;
 246
 247         if (flags & EXT4_EOFBLOCKS_FL) {
 248                 /* we don't support adding EOFBLOCKS flag */
 249                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 250                         err = -EOPNOTSUPP;
 251                         goto flags_out;
 252                 }
 253         } else if (oldflags & EXT4_EOFBLOCKS_FL)
 254                 ext4_truncate(inode);
 255
 256         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 257         if (IS_ERR(handle)) {
 258                 err = PTR_ERR(handle);
 259                 goto flags_out;
 260         }
 261         if (IS_SYNC(inode))
 262                 ext4_handle_sync(handle);
 263         err = ext4_reserve_inode_write(handle, inode, &iloc);
 264         if (err)
 265                 goto flags_err;
 266
 267         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 268                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 269                         continue;
 270                 if (mask & flags)
 271                         ext4_set_inode_flag(inode, i);
 272                 else
 273                         ext4_clear_inode_flag(inode, i);
 274         }
 275
 276         ext4_set_inode_flags(inode);
 277         inode->i_ctime = ext4_current_time(inode);
 278
 279         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 280 flags_err:
 281         ext4_journal_stop(handle);
 282         if (err)
 283                 goto flags_out;
 284
 285         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 286                 err = ext4_change_inode_journal_flag(inode, jflag);
 287         if (err)
 288                 goto flags_out;
 289         if (migrate) {
 290                 if (flags & EXT4_EXTENTS_FL)
 291                         err = ext4_ext_migrate(inode);
 292                 else
 293                         err = ext4_ind_migrate(inode);
 294         }
 295
 296 flags_out:
 297         return err;
 298 }
 299
 300 #ifdef CONFIG_QUOTA
 301 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 302 {
 303         struct inode *inode = file_inode(filp);
 304         struct super_block *sb = inode->i_sb;
 305         struct ext4_inode_info *ei = EXT4_I(inode);
 306         int err, rc;
 307         handle_t *handle;
 308         kprojid_t kprojid;
 309         struct ext4_iloc iloc;
 310         struct ext4_inode *raw_inode;
 311         struct dquot *transfer_to[MAXQUOTAS] = { };
 312
 313         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
 314                         EXT4_FEATURE_RO_COMPAT_PROJECT)) {
 315                 if (projid != EXT4_DEF_PROJID)
 316                         return -EOPNOTSUPP;
 317                 else
 318                         return 0;
 319         }
 320
 321         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 322                 return -EOPNOTSUPP;
 323
 324         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 325
 326         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 327                 return 0;
 328
 329         err = mnt_want_write_file(filp);
 330         if (err)
 331                 return err;
 332
 333         err = -EPERM;
 334         inode_lock(inode);
 335         /* Is it quota file? Do not allow user to mess with it */
 336         if (IS_NOQUOTA(inode))
 337                 goto out_unlock;
 338
 339         err = ext4_get_inode_loc(inode, &iloc);
 340         if (err)
 341                 goto out_unlock;
 342
 343         raw_inode = ext4_raw_inode(&iloc);
 344         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 345                 err = -EOVERFLOW;
 346                 brelse(iloc.bh);
 347                 goto out_unlock;
 348         }
 349         brelse(iloc.bh);
 350
 351         dquot_initialize(inode);
 352
 353         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 354                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 355                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 356         if (IS_ERR(handle)) {
 357                 err = PTR_ERR(handle);
 358                 goto out_unlock;
 359         }
 360
 361         err = ext4_reserve_inode_write(handle, inode, &iloc);
 362         if (err)
 363                 goto out_stop;
 364
 365         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 366         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 367                 err = __dquot_transfer(inode, transfer_to);
 368                 dqput(transfer_to[PRJQUOTA]);
 369                 if (err)
 370                         goto out_dirty;
 371         }
 372
 373         EXT4_I(inode)->i_projid = kprojid;
 374         inode->i_ctime = ext4_current_time(inode);
 375 out_dirty:
 376         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 377         if (!err)
 378                 err = rc;
 379 out_stop:
 380         ext4_journal_stop(handle);
 381 out_unlock:
 382         inode_unlock(inode);
 383         mnt_drop_write_file(filp);
 384         return err;
 385 }
 386 #else
 387 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 388 {
 389         if (projid != EXT4_DEF_PROJID)
 390                 return -EOPNOTSUPP;
 391         return 0;
 392 }
 393 #endif
 394
 395 /* Transfer internal flags to xflags */
 396 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 397 {
 398         __u32 xflags = 0;
 399
 400         if (iflags & EXT4_SYNC_FL)
 401                 xflags |= FS_XFLAG_SYNC;
 402         if (iflags & EXT4_IMMUTABLE_FL)
 403                 xflags |= FS_XFLAG_IMMUTABLE;
 404         if (iflags & EXT4_APPEND_FL)
 405                 xflags |= FS_XFLAG_APPEND;
 406         if (iflags & EXT4_NODUMP_FL)
 407                 xflags |= FS_XFLAG_NODUMP;
 408         if (iflags & EXT4_NOATIME_FL)
 409                 xflags |= FS_XFLAG_NOATIME;
 410         if (iflags & EXT4_PROJINHERIT_FL)
 411                 xflags |= FS_XFLAG_PROJINHERIT;
 412         return xflags;
 413 }
 414
 415 /* Transfer xflags flags to internal */
 416 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 417 {
 418         unsigned long iflags = 0;
 419
 420         if (xflags & FS_XFLAG_SYNC)
 421                 iflags |= EXT4_SYNC_FL;
 422         if (xflags & FS_XFLAG_IMMUTABLE)
 423                 iflags |= EXT4_IMMUTABLE_FL;
 424         if (xflags & FS_XFLAG_APPEND)
 425                 iflags |= EXT4_APPEND_FL;
 426         if (xflags & FS_XFLAG_NODUMP)
 427                 iflags |= EXT4_NODUMP_FL;
 428         if (xflags & FS_XFLAG_NOATIME)
 429                 iflags |= EXT4_NOATIME_FL;
 430         if (xflags & FS_XFLAG_PROJINHERIT)
 431                 iflags |= EXT4_PROJINHERIT_FL;
 432
 433         return iflags;
 434 }
 435
 436 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 437 {
 438         struct inode *inode = file_inode(filp);
 439         struct super_block *sb = inode->i_sb;
 440         struct ext4_inode_info *ei = EXT4_I(inode);
 441         unsigned int flags;
 442
 443         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 444
 445         switch (cmd) {
 446         case EXT4_IOC_GETFLAGS:
 447                 ext4_get_inode_flags(ei);
 448                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 449                 return put_user(flags, (int __user *) arg);
 450         case EXT4_IOC_SETFLAGS: {
 451                 int err;
 452
 453                 if (!inode_owner_or_capable(inode))
 454                         return -EACCES;
 455
 456                 if (get_user(flags, (int __user *) arg))
 457                         return -EFAULT;
 458
 459                 err = mnt_want_write_file(filp);
 460                 if (err)
 461                         return err;
 462
 463                 flags = ext4_mask_flags(inode->i_mode, flags);
 464
 465                 inode_lock(inode);
 466                 err = ext4_ioctl_setflags(inode, flags);
 467                 inode_unlock(inode);
 468                 mnt_drop_write_file(filp);
 469                 return err;
 470         }
 471         case EXT4_IOC_GETVERSION:
 472         case EXT4_IOC_GETVERSION_OLD:
 473                 return put_user(inode->i_generation, (int __user *) arg);
 474         case EXT4_IOC_SETVERSION:
 475         case EXT4_IOC_SETVERSION_OLD: {
 476                 handle_t *handle;
 477                 struct ext4_iloc iloc;
 478                 __u32 generation;
 479                 int err;
 480
 481                 if (!inode_owner_or_capable(inode))
 482                         return -EPERM;
 483
 484                 if (ext4_has_metadata_csum(inode->i_sb)) {
 485                         ext4_warning(sb, "Setting inode version is not "
 486                                      "supported with metadata_csum enabled.");
 487                         return -ENOTTY;
 488                 }
 489
 490                 err = mnt_want_write_file(filp);
 491                 if (err)
 492                         return err;
 493                 if (get_user(generation, (int __user *) arg)) {
 494                         err = -EFAULT;
 495                         goto setversion_out;
 496                 }
 497
 498                 inode_lock(inode);
 499                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 500                 if (IS_ERR(handle)) {
 501                         err = PTR_ERR(handle);
 502                         goto unlock_out;
 503                 }
 504                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 505                 if (err == 0) {
 506                         inode->i_ctime = ext4_current_time(inode);
 507                         inode->i_generation = generation;
 508                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 509                 }
 510                 ext4_journal_stop(handle);
 511
 512 unlock_out:
 513                 inode_unlock(inode);
 514 setversion_out:
 515                 mnt_drop_write_file(filp);
 516                 return err;
 517         }
 518         case EXT4_IOC_GROUP_EXTEND: {
 519                 ext4_fsblk_t n_blocks_count;
 520                 int err, err2=0;
 521
 522                 err = ext4_resize_begin(sb);
 523                 if (err)
 524                         return err;
 525
 526                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 527                         err = -EFAULT;
 528                         goto group_extend_out;
 529                 }
 530
 531                 if (ext4_has_feature_bigalloc(sb)) {
 532                         ext4_msg(sb, KERN_ERR,
 533                                  "Online resizing not supported with bigalloc");
 534                         err = -EOPNOTSUPP;
 535                         goto group_extend_out;
 536                 }
 537
 538                 err = mnt_want_write_file(filp);
 539                 if (err)
 540                         goto group_extend_out;
 541
 542                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 543                 if (EXT4_SB(sb)->s_journal) {
 544                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 545                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 546                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 547                 }
 548                 if (err == 0)
 549                         err = err2;
 550                 mnt_drop_write_file(filp);
 551 group_extend_out:
 552                 ext4_resize_end(sb);
 553                 return err;
 554         }
 555
 556         case EXT4_IOC_MOVE_EXT: {
 557                 struct move_extent me;
 558                 struct fd donor;
 559                 int err;
 560
 561                 if (!(filp->f_mode & FMODE_READ) ||
 562                     !(filp->f_mode & FMODE_WRITE))
 563                         return -EBADF;
 564
 565                 if (copy_from_user(&me,
 566                         (struct move_extent __user *)arg, sizeof(me)))
 567                         return -EFAULT;
 568                 me.moved_len = 0;
 569
 570                 donor = fdget(me.donor_fd);
 571                 if (!donor.file)
 572                         return -EBADF;
 573
 574                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 575                         err = -EBADF;
 576                         goto mext_out;
 577                 }
 578
 579                 if (ext4_has_feature_bigalloc(sb)) {
 580                         ext4_msg(sb, KERN_ERR,
 581                                  "Online defrag not supported with bigalloc");
 582                         err = -EOPNOTSUPP;
 583                         goto mext_out;
 584                 } else if (IS_DAX(inode)) {
 585                         ext4_msg(sb, KERN_ERR,
 586                                  "Online defrag not supported with DAX");
 587                         err = -EOPNOTSUPP;
 588                         goto mext_out;
 589                 }
 590
 591                 err = mnt_want_write_file(filp);
 592                 if (err)
 593                         goto mext_out;
 594
 595                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 596                                         me.donor_start, me.len, &me.moved_len);
 597                 mnt_drop_write_file(filp);
 598
 599                 if (copy_to_user((struct move_extent __user *)arg,
 600                                  &me, sizeof(me)))
 601                         err = -EFAULT;
 602 mext_out:
 603                 fdput(donor);
 604                 return err;
 605         }
 606
 607         case EXT4_IOC_GROUP_ADD: {
 608                 struct ext4_new_group_data input;
 609                 int err, err2=0;
 610
 611                 err = ext4_resize_begin(sb);
 612                 if (err)
 613                         return err;
 614
 615                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 616                                 sizeof(input))) {
 617                         err = -EFAULT;
 618                         goto group_add_out;
 619                 }
 620
 621                 if (ext4_has_feature_bigalloc(sb)) {
 622                         ext4_msg(sb, KERN_ERR,
 623                                  "Online resizing not supported with bigalloc");
 624                         err = -EOPNOTSUPP;
 625                         goto group_add_out;
 626                 }
 627
 628                 err = mnt_want_write_file(filp);
 629                 if (err)
 630                         goto group_add_out;
 631
 632                 err = ext4_group_add(sb, &input);
 633                 if (EXT4_SB(sb)->s_journal) {
 634                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 635                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 636                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 637                 }
 638                 if (err == 0)
 639                         err = err2;
 640                 mnt_drop_write_file(filp);
 641                 if (!err && ext4_has_group_desc_csum(sb) &&
 642                     test_opt(sb, INIT_INODE_TABLE))
 643                         err = ext4_register_li_request(sb, input.group);
 644 group_add_out:
 645                 ext4_resize_end(sb);
 646                 return err;
 647         }
 648
 649         case EXT4_IOC_MIGRATE:
 650         {
 651                 int err;
 652                 if (!inode_owner_or_capable(inode))
 653                         return -EACCES;
 654
 655                 err = mnt_want_write_file(filp);
 656                 if (err)
 657                         return err;
 658                 /*
 659                  * inode_mutex prevent write and truncate on the file.
 660                  * Read still goes through. We take i_data_sem in
 661                  * ext4_ext_swap_inode_data before we switch the
 662                  * inode format to prevent read.
 663                  */
 664                 inode_lock((inode));
 665                 err = ext4_ext_migrate(inode);
 666                 inode_unlock((inode));
 667                 mnt_drop_write_file(filp);
 668                 return err;
 669         }
 670
 671         case EXT4_IOC_ALLOC_DA_BLKS:
 672         {
 673                 int err;
 674                 if (!inode_owner_or_capable(inode))
 675                         return -EACCES;
 676
 677                 err = mnt_want_write_file(filp);
 678                 if (err)
 679                         return err;
 680                 err = ext4_alloc_da_blocks(inode);
 681                 mnt_drop_write_file(filp);
 682                 return err;
 683         }
 684
 685         case EXT4_IOC_SWAP_BOOT:
 686         {
 687                 int err;
 688                 if (!(filp->f_mode & FMODE_WRITE))
 689                         return -EBADF;
 690                 err = mnt_want_write_file(filp);
 691                 if (err)
 692                         return err;
 693                 err = swap_inode_boot_loader(sb, inode);
 694                 mnt_drop_write_file(filp);
 695                 return err;
 696         }
 697
 698         case EXT4_IOC_RESIZE_FS: {
 699                 ext4_fsblk_t n_blocks_count;
 700                 int err = 0, err2 = 0;
 701                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 702
 703                 if (ext4_has_feature_bigalloc(sb)) {
 704                         ext4_msg(sb, KERN_ERR,
 705                                  "Online resizing not (yet) supported with bigalloc");
 706                         return -EOPNOTSUPP;
 707                 }
 708
 709                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 710                                    sizeof(__u64))) {
 711                         return -EFAULT;
 712                 }
 713
 714                 err = ext4_resize_begin(sb);
 715                 if (err)
 716                         return err;
 717
 718                 err = mnt_want_write_file(filp);
 719                 if (err)
 720                         goto resizefs_out;
 721
 722                 err = ext4_resize_fs(sb, n_blocks_count);
 723                 if (EXT4_SB(sb)->s_journal) {
 724                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 725                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 726                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 727                 }
 728                 if (err == 0)
 729                         err = err2;
 730                 mnt_drop_write_file(filp);
 731                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 732                     ext4_has_group_desc_csum(sb) &&
 733                     test_opt(sb, INIT_INODE_TABLE))
 734                         err = ext4_register_li_request(sb, o_group);
 735
 736 resizefs_out:
 737                 ext4_resize_end(sb);
 738                 return err;
 739         }
 740
 741         case FITRIM:
 742         {
 743                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 744                 struct fstrim_range range;
 745                 int ret = 0;
 746
 747                 if (!capable(CAP_SYS_ADMIN))
 748                         return -EPERM;
 749
 750                 if (!blk_queue_discard(q))
 751                         return -EOPNOTSUPP;
 752
 753                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 754                     sizeof(range)))
 755                         return -EFAULT;
 756
 757                 range.minlen = max((unsigned int)range.minlen,
 758                                    q->limits.discard_granularity);
 759                 ret = ext4_trim_fs(sb, &range);
 760                 if (ret < 0)
 761                         return ret;
 762
 763                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 764                     sizeof(range)))
 765                         return -EFAULT;
 766
 767                 return 0;
 768         }
 769         case EXT4_IOC_PRECACHE_EXTENTS:
 770                 return ext4_ext_precache(inode);
 771         case EXT4_IOC_SET_ENCRYPTION_POLICY: {
 772 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 773                 struct fscrypt_policy policy;
 774
 775                 if (copy_from_user(&policy,
 776                                    (struct fscrypt_policy __user *)arg,
 777                                    sizeof(policy)))
 778                         return -EFAULT;
 779                 return fscrypt_process_policy(inode, &policy);
 780 #else
 781                 return -EOPNOTSUPP;
 782 #endif
 783         }
 784         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 785                 int err, err2;
 786                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 787                 handle_t *handle;
 788
 789                 if (!ext4_sb_has_crypto(sb))
 790                         return -EOPNOTSUPP;
 791                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 792                         err = mnt_want_write_file(filp);
 793                         if (err)
 794                                 return err;
 795                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 796                         if (IS_ERR(handle)) {
 797                                 err = PTR_ERR(handle);
 798                                 goto pwsalt_err_exit;
 799                         }
 800                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 801                         if (err)
 802                                 goto pwsalt_err_journal;
 803                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 804                         err = ext4_handle_dirty_metadata(handle, NULL,
 805                                                          sbi->s_sbh);
 806                 pwsalt_err_journal:
 807                         err2 = ext4_journal_stop(handle);
 808                         if (err2 && !err)
 809                                 err = err2;
 810                 pwsalt_err_exit:
 811                         mnt_drop_write_file(filp);
 812                         if (err)
 813                                 return err;
 814                 }
 815                 if (copy_to_user((void __user *) arg,
 816                                  sbi->s_es->s_encrypt_pw_salt, 16))
 817                         return -EFAULT;
 818                 return 0;
 819         }
 820         case EXT4_IOC_GET_ENCRYPTION_POLICY: {
 821 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 822                 struct fscrypt_policy policy;
 823                 int err = 0;
 824
 825                 if (!ext4_encrypted_inode(inode))
 826                         return -ENOENT;
 827                 err = fscrypt_get_policy(inode, &policy);
 828                 if (err)
 829                         return err;
 830                 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
 831                         return -EFAULT;
 832                 return 0;
 833 #else
 834                 return -EOPNOTSUPP;
 835 #endif
 836         }
 837         case EXT4_IOC_FSGETXATTR:
 838         {
 839                 struct fsxattr fa;
 840
 841                 memset(&fa, 0, sizeof(struct fsxattr));
 842                 ext4_get_inode_flags(ei);
 843                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 844
 845                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
 846                                 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
 847                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 848                                 EXT4_I(inode)->i_projid);
 849                 }
 850
 851                 if (copy_to_user((struct fsxattr __user *)arg,
 852                                  &fa, sizeof(fa)))
 853                         return -EFAULT;
 854                 return 0;
 855         }
 856         case EXT4_IOC_FSSETXATTR:
 857         {
 858                 struct fsxattr fa;
 859                 int err;
 860
 861                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 862                                    sizeof(fa)))
 863                         return -EFAULT;
 864
 865                 /* Make sure caller has proper permission */
 866                 if (!inode_owner_or_capable(inode))
 867                         return -EACCES;
 868
 869                 err = mnt_want_write_file(filp);
 870                 if (err)
 871                         return err;
 872
 873                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
 874                 flags = ext4_mask_flags(inode->i_mode, flags);
 875
 876                 inode_lock(inode);
 877                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
 878                          (flags & EXT4_FL_XFLAG_VISIBLE);
 879                 err = ext4_ioctl_setflags(inode, flags);
 880                 inode_unlock(inode);
 881                 mnt_drop_write_file(filp);
 882                 if (err)
 883                         return err;
 884
 885                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
 886                 if (err)
 887                         return err;
 888
 889                 return 0;
 890         }
 891         default:
 892                 return -ENOTTY;
 893         }
 894 }
 895
 896 #ifdef CONFIG_COMPAT
 897 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 898 {
 899         /* These are just misnamed, they actually get/put from/to user an int */
 900         switch (cmd) {
 901         case EXT4_IOC32_GETFLAGS:
 902                 cmd = EXT4_IOC_GETFLAGS;
 903                 break;
 904         case EXT4_IOC32_SETFLAGS:
 905                 cmd = EXT4_IOC_SETFLAGS;
 906                 break;
 907         case EXT4_IOC32_GETVERSION:
 908                 cmd = EXT4_IOC_GETVERSION;
 909                 break;
 910         case EXT4_IOC32_SETVERSION:
 911                 cmd = EXT4_IOC_SETVERSION;
 912                 break;
 913         case EXT4_IOC32_GROUP_EXTEND:
 914                 cmd = EXT4_IOC_GROUP_EXTEND;
 915                 break;
 916         case EXT4_IOC32_GETVERSION_OLD:
 917                 cmd = EXT4_IOC_GETVERSION_OLD;
 918                 break;
 919         case EXT4_IOC32_SETVERSION_OLD:
 920                 cmd = EXT4_IOC_SETVERSION_OLD;
 921                 break;
 922         case EXT4_IOC32_GETRSVSZ:
 923                 cmd = EXT4_IOC_GETRSVSZ;
 924                 break;
 925         case EXT4_IOC32_SETRSVSZ:
 926                 cmd = EXT4_IOC_SETRSVSZ;
 927                 break;
 928         case EXT4_IOC32_GROUP_ADD: {
 929                 struct compat_ext4_new_group_input __user *uinput;
 930                 struct ext4_new_group_input input;
 931                 mm_segment_t old_fs;
 932                 int err;
 933
 934                 uinput = compat_ptr(arg);
 935                 err = get_user(input.group, &uinput->group);
 936                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 937                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 938                 err |= get_user(input.inode_table, &uinput->inode_table);
 939                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 940                 err |= get_user(input.reserved_blocks,
 941                                 &uinput->reserved_blocks);
 942                 if (err)
 943                         return -EFAULT;
 944                 old_fs = get_fs();
 945                 set_fs(KERNEL_DS);
 946                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 947                                  (unsigned long) &input);
 948                 set_fs(old_fs);
 949                 return err;
 950         }
 951         case EXT4_IOC_MOVE_EXT:
 952         case EXT4_IOC_RESIZE_FS:
 953         case EXT4_IOC_PRECACHE_EXTENTS:
 954         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 955         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
 956         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 957                 break;
 958         default:
 959                 return -ENOIOCTLCMD;
 960         }
 961         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 962 }
 963 #endif