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/random.h>
  17 #include <linux/quotaops.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
 312         if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
 313                         EXT4_FEATURE_RO_COMPAT_PROJECT)) {
 314                 if (projid != EXT4_DEF_PROJID)
 315                         return -EOPNOTSUPP;
 316                 else
 317                         return 0;
 318         }
 319
 320         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 321                 return -EOPNOTSUPP;
 322
 323         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 324
 325         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 326                 return 0;
 327
 328         err = mnt_want_write_file(filp);
 329         if (err)
 330                 return err;
 331
 332         err = -EPERM;
 333         inode_lock(inode);
 334         /* Is it quota file? Do not allow user to mess with it */
 335         if (IS_NOQUOTA(inode))
 336                 goto out_unlock;
 337
 338         err = ext4_get_inode_loc(inode, &iloc);
 339         if (err)
 340                 goto out_unlock;
 341
 342         raw_inode = ext4_raw_inode(&iloc);
 343         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 344                 err = -EOVERFLOW;
 345                 brelse(iloc.bh);
 346                 goto out_unlock;
 347         }
 348         brelse(iloc.bh);
 349
 350         dquot_initialize(inode);
 351
 352         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 353                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 354                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 355         if (IS_ERR(handle)) {
 356                 err = PTR_ERR(handle);
 357                 goto out_unlock;
 358         }
 359
 360         err = ext4_reserve_inode_write(handle, inode, &iloc);
 361         if (err)
 362                 goto out_stop;
 363
 364         if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
 365                 struct dquot *transfer_to[MAXQUOTAS] = { };
 366
 367                 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 368                 if (transfer_to[PRJQUOTA]) {
 369                         err = __dquot_transfer(inode, transfer_to);
 370                         dqput(transfer_to[PRJQUOTA]);
 371                         if (err)
 372                                 goto out_dirty;
 373                 }
 374         }
 375         EXT4_I(inode)->i_projid = kprojid;
 376         inode->i_ctime = ext4_current_time(inode);
 377 out_dirty:
 378         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 379         if (!err)
 380                 err = rc;
 381 out_stop:
 382         ext4_journal_stop(handle);
 383 out_unlock:
 384         inode_unlock(inode);
 385         mnt_drop_write_file(filp);
 386         return err;
 387 }
 388 #else
 389 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 390 {
 391         if (projid != EXT4_DEF_PROJID)
 392                 return -EOPNOTSUPP;
 393         return 0;
 394 }
 395 #endif
 396
 397 /* Transfer internal flags to xflags */
 398 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 399 {
 400         __u32 xflags = 0;
 401
 402         if (iflags & EXT4_SYNC_FL)
 403                 xflags |= FS_XFLAG_SYNC;
 404         if (iflags & EXT4_IMMUTABLE_FL)
 405                 xflags |= FS_XFLAG_IMMUTABLE;
 406         if (iflags & EXT4_APPEND_FL)
 407                 xflags |= FS_XFLAG_APPEND;
 408         if (iflags & EXT4_NODUMP_FL)
 409                 xflags |= FS_XFLAG_NODUMP;
 410         if (iflags & EXT4_NOATIME_FL)
 411                 xflags |= FS_XFLAG_NOATIME;
 412         if (iflags & EXT4_PROJINHERIT_FL)
 413                 xflags |= FS_XFLAG_PROJINHERIT;
 414         return xflags;
 415 }
 416
 417 /* Transfer xflags flags to internal */
 418 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 419 {
 420         unsigned long iflags = 0;
 421
 422         if (xflags & FS_XFLAG_SYNC)
 423                 iflags |= EXT4_SYNC_FL;
 424         if (xflags & FS_XFLAG_IMMUTABLE)
 425                 iflags |= EXT4_IMMUTABLE_FL;
 426         if (xflags & FS_XFLAG_APPEND)
 427                 iflags |= EXT4_APPEND_FL;
 428         if (xflags & FS_XFLAG_NODUMP)
 429                 iflags |= EXT4_NODUMP_FL;
 430         if (xflags & FS_XFLAG_NOATIME)
 431                 iflags |= EXT4_NOATIME_FL;
 432         if (xflags & FS_XFLAG_PROJINHERIT)
 433                 iflags |= EXT4_PROJINHERIT_FL;
 434
 435         return iflags;
 436 }
 437
 438 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 439 {
 440         struct inode *inode = file_inode(filp);
 441         struct super_block *sb = inode->i_sb;
 442         struct ext4_inode_info *ei = EXT4_I(inode);
 443         unsigned int flags;
 444
 445         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 446
 447         switch (cmd) {
 448         case EXT4_IOC_GETFLAGS:
 449                 ext4_get_inode_flags(ei);
 450                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 451                 return put_user(flags, (int __user *) arg);
 452         case EXT4_IOC_SETFLAGS: {
 453                 int err;
 454
 455                 if (!inode_owner_or_capable(inode))
 456                         return -EACCES;
 457
 458                 if (get_user(flags, (int __user *) arg))
 459                         return -EFAULT;
 460
 461                 err = mnt_want_write_file(filp);
 462                 if (err)
 463                         return err;
 464
 465                 flags = ext4_mask_flags(inode->i_mode, flags);
 466
 467                 inode_lock(inode);
 468                 err = ext4_ioctl_setflags(inode, flags);
 469                 inode_unlock(inode);
 470                 mnt_drop_write_file(filp);
 471                 return err;
 472         }
 473         case EXT4_IOC_GETVERSION:
 474         case EXT4_IOC_GETVERSION_OLD:
 475                 return put_user(inode->i_generation, (int __user *) arg);
 476         case EXT4_IOC_SETVERSION:
 477         case EXT4_IOC_SETVERSION_OLD: {
 478                 handle_t *handle;
 479                 struct ext4_iloc iloc;
 480                 __u32 generation;
 481                 int err;
 482
 483                 if (!inode_owner_or_capable(inode))
 484                         return -EPERM;
 485
 486                 if (ext4_has_metadata_csum(inode->i_sb)) {
 487                         ext4_warning(sb, "Setting inode version is not "
 488                                      "supported with metadata_csum enabled.");
 489                         return -ENOTTY;
 490                 }
 491
 492                 err = mnt_want_write_file(filp);
 493                 if (err)
 494                         return err;
 495                 if (get_user(generation, (int __user *) arg)) {
 496                         err = -EFAULT;
 497                         goto setversion_out;
 498                 }
 499
 500                 inode_lock(inode);
 501                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 502                 if (IS_ERR(handle)) {
 503                         err = PTR_ERR(handle);
 504                         goto unlock_out;
 505                 }
 506                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 507                 if (err == 0) {
 508                         inode->i_ctime = ext4_current_time(inode);
 509                         inode->i_generation = generation;
 510                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 511                 }
 512                 ext4_journal_stop(handle);
 513
 514 unlock_out:
 515                 inode_unlock(inode);
 516 setversion_out:
 517                 mnt_drop_write_file(filp);
 518                 return err;
 519         }
 520         case EXT4_IOC_GROUP_EXTEND: {
 521                 ext4_fsblk_t n_blocks_count;
 522                 int err, err2=0;
 523
 524                 err = ext4_resize_begin(sb);
 525                 if (err)
 526                         return err;
 527
 528                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 529                         err = -EFAULT;
 530                         goto group_extend_out;
 531                 }
 532
 533                 if (ext4_has_feature_bigalloc(sb)) {
 534                         ext4_msg(sb, KERN_ERR,
 535                                  "Online resizing not supported with bigalloc");
 536                         err = -EOPNOTSUPP;
 537                         goto group_extend_out;
 538                 }
 539
 540                 err = mnt_want_write_file(filp);
 541                 if (err)
 542                         goto group_extend_out;
 543
 544                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 545                 if (EXT4_SB(sb)->s_journal) {
 546                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 547                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 548                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 549                 }
 550                 if (err == 0)
 551                         err = err2;
 552                 mnt_drop_write_file(filp);
 553 group_extend_out:
 554                 ext4_resize_end(sb);
 555                 return err;
 556         }
 557
 558         case EXT4_IOC_MOVE_EXT: {
 559                 struct move_extent me;
 560                 struct fd donor;
 561                 int err;
 562
 563                 if (!(filp->f_mode & FMODE_READ) ||
 564                     !(filp->f_mode & FMODE_WRITE))
 565                         return -EBADF;
 566
 567                 if (copy_from_user(&me,
 568                         (struct move_extent __user *)arg, sizeof(me)))
 569                         return -EFAULT;
 570                 me.moved_len = 0;
 571
 572                 donor = fdget(me.donor_fd);
 573                 if (!donor.file)
 574                         return -EBADF;
 575
 576                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 577                         err = -EBADF;
 578                         goto mext_out;
 579                 }
 580
 581                 if (ext4_has_feature_bigalloc(sb)) {
 582                         ext4_msg(sb, KERN_ERR,
 583                                  "Online defrag not supported with bigalloc");
 584                         err = -EOPNOTSUPP;
 585                         goto mext_out;
 586                 }
 587
 588                 err = mnt_want_write_file(filp);
 589                 if (err)
 590                         goto mext_out;
 591
 592                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 593                                         me.donor_start, me.len, &me.moved_len);
 594                 mnt_drop_write_file(filp);
 595
 596                 if (copy_to_user((struct move_extent __user *)arg,
 597                                  &me, sizeof(me)))
 598                         err = -EFAULT;
 599 mext_out:
 600                 fdput(donor);
 601                 return err;
 602         }
 603
 604         case EXT4_IOC_GROUP_ADD: {
 605                 struct ext4_new_group_data input;
 606                 int err, err2=0;
 607
 608                 err = ext4_resize_begin(sb);
 609                 if (err)
 610                         return err;
 611
 612                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 613                                 sizeof(input))) {
 614                         err = -EFAULT;
 615                         goto group_add_out;
 616                 }
 617
 618                 if (ext4_has_feature_bigalloc(sb)) {
 619                         ext4_msg(sb, KERN_ERR,
 620                                  "Online resizing not supported with bigalloc");
 621                         err = -EOPNOTSUPP;
 622                         goto group_add_out;
 623                 }
 624
 625                 err = mnt_want_write_file(filp);
 626                 if (err)
 627                         goto group_add_out;
 628
 629                 err = ext4_group_add(sb, &input);
 630                 if (EXT4_SB(sb)->s_journal) {
 631                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 632                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 633                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 634                 }
 635                 if (err == 0)
 636                         err = err2;
 637                 mnt_drop_write_file(filp);
 638                 if (!err && ext4_has_group_desc_csum(sb) &&
 639                     test_opt(sb, INIT_INODE_TABLE))
 640                         err = ext4_register_li_request(sb, input.group);
 641 group_add_out:
 642                 ext4_resize_end(sb);
 643                 return err;
 644         }
 645
 646         case EXT4_IOC_MIGRATE:
 647         {
 648                 int err;
 649                 if (!inode_owner_or_capable(inode))
 650                         return -EACCES;
 651
 652                 err = mnt_want_write_file(filp);
 653                 if (err)
 654                         return err;
 655                 /*
 656                  * inode_mutex prevent write and truncate on the file.
 657                  * Read still goes through. We take i_data_sem in
 658                  * ext4_ext_swap_inode_data before we switch the
 659                  * inode format to prevent read.
 660                  */
 661                 inode_lock((inode));
 662                 err = ext4_ext_migrate(inode);
 663                 inode_unlock((inode));
 664                 mnt_drop_write_file(filp);
 665                 return err;
 666         }
 667
 668         case EXT4_IOC_ALLOC_DA_BLKS:
 669         {
 670                 int err;
 671                 if (!inode_owner_or_capable(inode))
 672                         return -EACCES;
 673
 674                 err = mnt_want_write_file(filp);
 675                 if (err)
 676                         return err;
 677                 err = ext4_alloc_da_blocks(inode);
 678                 mnt_drop_write_file(filp);
 679                 return err;
 680         }
 681
 682         case EXT4_IOC_SWAP_BOOT:
 683         {
 684                 int err;
 685                 if (!(filp->f_mode & FMODE_WRITE))
 686                         return -EBADF;
 687                 err = mnt_want_write_file(filp);
 688                 if (err)
 689                         return err;
 690                 err = swap_inode_boot_loader(sb, inode);
 691                 mnt_drop_write_file(filp);
 692                 return err;
 693         }
 694
 695         case EXT4_IOC_RESIZE_FS: {
 696                 ext4_fsblk_t n_blocks_count;
 697                 int err = 0, err2 = 0;
 698                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 699
 700                 if (ext4_has_feature_bigalloc(sb)) {
 701                         ext4_msg(sb, KERN_ERR,
 702                                  "Online resizing not (yet) supported with bigalloc");
 703                         return -EOPNOTSUPP;
 704                 }
 705
 706                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 707                                    sizeof(__u64))) {
 708                         return -EFAULT;
 709                 }
 710
 711                 err = ext4_resize_begin(sb);
 712                 if (err)
 713                         return err;
 714
 715                 err = mnt_want_write_file(filp);
 716                 if (err)
 717                         goto resizefs_out;
 718
 719                 err = ext4_resize_fs(sb, n_blocks_count);
 720                 if (EXT4_SB(sb)->s_journal) {
 721                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 722                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 723                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 724                 }
 725                 if (err == 0)
 726                         err = err2;
 727                 mnt_drop_write_file(filp);
 728                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 729                     ext4_has_group_desc_csum(sb) &&
 730                     test_opt(sb, INIT_INODE_TABLE))
 731                         err = ext4_register_li_request(sb, o_group);
 732
 733 resizefs_out:
 734                 ext4_resize_end(sb);
 735                 return err;
 736         }
 737
 738         case FITRIM:
 739         {
 740                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 741                 struct fstrim_range range;
 742                 int ret = 0;
 743
 744                 if (!capable(CAP_SYS_ADMIN))
 745                         return -EPERM;
 746
 747                 if (!blk_queue_discard(q))
 748                         return -EOPNOTSUPP;
 749
 750                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 751                     sizeof(range)))
 752                         return -EFAULT;
 753
 754                 range.minlen = max((unsigned int)range.minlen,
 755                                    q->limits.discard_granularity);
 756                 ret = ext4_trim_fs(sb, &range);
 757                 if (ret < 0)
 758                         return ret;
 759
 760                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 761                     sizeof(range)))
 762                         return -EFAULT;
 763
 764                 return 0;
 765         }
 766         case EXT4_IOC_PRECACHE_EXTENTS:
 767                 return ext4_ext_precache(inode);
 768         case EXT4_IOC_SET_ENCRYPTION_POLICY: {
 769 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 770                 struct ext4_encryption_policy policy;
 771                 int err = 0;
 772
 773                 if (copy_from_user(&policy,
 774                                    (struct ext4_encryption_policy __user *)arg,
 775                                    sizeof(policy))) {
 776                         err = -EFAULT;
 777                         goto encryption_policy_out;
 778                 }
 779
 780                 err = ext4_process_policy(&policy, inode);
 781 encryption_policy_out:
 782                 return err;
 783 #else
 784                 return -EOPNOTSUPP;
 785 #endif
 786         }
 787         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 788                 int err, err2;
 789                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 790                 handle_t *handle;
 791
 792                 if (!ext4_sb_has_crypto(sb))
 793                         return -EOPNOTSUPP;
 794                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 795                         err = mnt_want_write_file(filp);
 796                         if (err)
 797                                 return err;
 798                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 799                         if (IS_ERR(handle)) {
 800                                 err = PTR_ERR(handle);
 801                                 goto pwsalt_err_exit;
 802                         }
 803                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 804                         if (err)
 805                                 goto pwsalt_err_journal;
 806                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 807                         err = ext4_handle_dirty_metadata(handle, NULL,
 808                                                          sbi->s_sbh);
 809                 pwsalt_err_journal:
 810                         err2 = ext4_journal_stop(handle);
 811                         if (err2 && !err)
 812                                 err = err2;
 813                 pwsalt_err_exit:
 814                         mnt_drop_write_file(filp);
 815                         if (err)
 816                                 return err;
 817                 }
 818                 if (copy_to_user((void __user *) arg,
 819                                  sbi->s_es->s_encrypt_pw_salt, 16))
 820                         return -EFAULT;
 821                 return 0;
 822         }
 823         case EXT4_IOC_GET_ENCRYPTION_POLICY: {
 824 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 825                 struct ext4_encryption_policy policy;
 826                 int err = 0;
 827
 828                 if (!ext4_encrypted_inode(inode))
 829                         return -ENOENT;
 830                 err = ext4_get_policy(inode, &policy);
 831                 if (err)
 832                         return err;
 833                 if (copy_to_user((void __user *)arg, &policy, sizeof(policy)))
 834                         return -EFAULT;
 835                 return 0;
 836 #else
 837                 return -EOPNOTSUPP;
 838 #endif
 839         }
 840         case EXT4_IOC_FSGETXATTR:
 841         {
 842                 struct fsxattr fa;
 843
 844                 memset(&fa, 0, sizeof(struct fsxattr));
 845                 ext4_get_inode_flags(ei);
 846                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 847
 848                 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
 849                                 EXT4_FEATURE_RO_COMPAT_PROJECT)) {
 850                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 851                                 EXT4_I(inode)->i_projid);
 852                 }
 853
 854                 if (copy_to_user((struct fsxattr __user *)arg,
 855                                  &fa, sizeof(fa)))
 856                         return -EFAULT;
 857                 return 0;
 858         }
 859         case EXT4_IOC_FSSETXATTR:
 860         {
 861                 struct fsxattr fa;
 862                 int err;
 863
 864                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 865                                    sizeof(fa)))
 866                         return -EFAULT;
 867
 868                 /* Make sure caller has proper permission */
 869                 if (!inode_owner_or_capable(inode))
 870                         return -EACCES;
 871
 872                 err = mnt_want_write_file(filp);
 873                 if (err)
 874                         return err;
 875
 876                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
 877                 flags = ext4_mask_flags(inode->i_mode, flags);
 878
 879                 inode_lock(inode);
 880                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
 881                          (flags & EXT4_FL_XFLAG_VISIBLE);
 882                 err = ext4_ioctl_setflags(inode, flags);
 883                 inode_unlock(inode);
 884                 mnt_drop_write_file(filp);
 885                 if (err)
 886                         return err;
 887
 888                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
 889                 if (err)
 890                         return err;
 891
 892                 return 0;
 893         }
 894         default:
 895                 return -ENOTTY;
 896         }
 897 }
 898
 899 #ifdef CONFIG_COMPAT
 900 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 901 {
 902         /* These are just misnamed, they actually get/put from/to user an int */
 903         switch (cmd) {
 904         case EXT4_IOC32_GETFLAGS:
 905                 cmd = EXT4_IOC_GETFLAGS;
 906                 break;
 907         case EXT4_IOC32_SETFLAGS:
 908                 cmd = EXT4_IOC_SETFLAGS;
 909                 break;
 910         case EXT4_IOC32_GETVERSION:
 911                 cmd = EXT4_IOC_GETVERSION;
 912                 break;
 913         case EXT4_IOC32_SETVERSION:
 914                 cmd = EXT4_IOC_SETVERSION;
 915                 break;
 916         case EXT4_IOC32_GROUP_EXTEND:
 917                 cmd = EXT4_IOC_GROUP_EXTEND;
 918                 break;
 919         case EXT4_IOC32_GETVERSION_OLD:
 920                 cmd = EXT4_IOC_GETVERSION_OLD;
 921                 break;
 922         case EXT4_IOC32_SETVERSION_OLD:
 923                 cmd = EXT4_IOC_SETVERSION_OLD;
 924                 break;
 925         case EXT4_IOC32_GETRSVSZ:
 926                 cmd = EXT4_IOC_GETRSVSZ;
 927                 break;
 928         case EXT4_IOC32_SETRSVSZ:
 929                 cmd = EXT4_IOC_SETRSVSZ;
 930                 break;
 931         case EXT4_IOC32_GROUP_ADD: {
 932                 struct compat_ext4_new_group_input __user *uinput;
 933                 struct ext4_new_group_input input;
 934                 mm_segment_t old_fs;
 935                 int err;
 936
 937                 uinput = compat_ptr(arg);
 938                 err = get_user(input.group, &uinput->group);
 939                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 940                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 941                 err |= get_user(input.inode_table, &uinput->inode_table);
 942                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 943                 err |= get_user(input.reserved_blocks,
 944                                 &uinput->reserved_blocks);
 945                 if (err)
 946                         return -EFAULT;
 947                 old_fs = get_fs();
 948                 set_fs(KERNEL_DS);
 949                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 950                                  (unsigned long) &input);
 951                 set_fs(old_fs);
 952                 return err;
 953         }
 954         case EXT4_IOC_MOVE_EXT:
 955         case EXT4_IOC_RESIZE_FS:
 956         case EXT4_IOC_PRECACHE_EXTENTS:
 957         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 958         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
 959         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 960                 break;
 961         default:
 962                 return -ENOIOCTLCMD;
 963         }
 964         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 965 }
 966 #endif