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 <linux/uaccess.h>
  19 #include "ext4_jbd2.h"
  20 #include "ext4.h"
  21
  22 /**
  23  * Swap memory between @a and @b for @len bytes.
  24  *
  25  * @a:          pointer to first memory area
  26  * @b:          pointer to second memory area
  27  * @len:        number of bytes to swap
  28  *
  29  */
  30 static void memswap(void *a, void *b, size_t len)
  31 {
  32         unsigned char *ap, *bp;
  33
  34         ap = (unsigned char *)a;
  35         bp = (unsigned char *)b;
  36         while (len-- > 0) {
  37                 swap(*ap, *bp);
  38                 ap++;
  39                 bp++;
  40         }
  41 }
  42
  43 /**
  44  * Swap i_data and associated attributes between @inode1 and @inode2.
  45  * This function is used for the primary swap between inode1 and inode2
  46  * and also to revert this primary swap in case of errors.
  47  *
  48  * Therefore you have to make sure, that calling this method twice
  49  * will revert all changes.
  50  *
  51  * @inode1:     pointer to first inode
  52  * @inode2:     pointer to second inode
  53  */
  54 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  55 {
  56         loff_t isize;
  57         struct ext4_inode_info *ei1;
  58         struct ext4_inode_info *ei2;
  59
  60         ei1 = EXT4_I(inode1);
  61         ei2 = EXT4_I(inode2);
  62
  63         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  64         memswap(&inode1->i_version, &inode2->i_version,
  65                   sizeof(inode1->i_version));
  66         memswap(&inode1->i_blocks, &inode2->i_blocks,
  67                   sizeof(inode1->i_blocks));
  68         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  69         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  70         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  71
  72         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  73         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  74         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  75         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  76         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  77
  78         isize = i_size_read(inode1);
  79         i_size_write(inode1, i_size_read(inode2));
  80         i_size_write(inode2, isize);
  81 }
  82
  83 /**
  84  * Swap the information from the given @inode and the inode
  85  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  86  * important fields of the inodes.
  87  *
  88  * @sb:         the super block of the filesystem
  89  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  90  *
  91  */
  92 static long swap_inode_boot_loader(struct super_block *sb,
  93                                 struct inode *inode)
  94 {
  95         handle_t *handle;
  96         int err;
  97         struct inode *inode_bl;
  98         struct ext4_inode_info *ei_bl;
  99         struct ext4_sb_info *sbi = EXT4_SB(sb);
 100
 101         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 102                 return -EINVAL;
 103
 104         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 105                 return -EPERM;
 106
 107         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 108         if (IS_ERR(inode_bl))
 109                 return PTR_ERR(inode_bl);
 110         ei_bl = EXT4_I(inode_bl);
 111
 112         filemap_flush(inode->i_mapping);
 113         filemap_flush(inode_bl->i_mapping);
 114
 115         /* Protect orig inodes against a truncate and make sure,
 116          * that only 1 swap_inode_boot_loader is running. */
 117         lock_two_nondirectories(inode, inode_bl);
 118
 119         truncate_inode_pages(&inode->i_data, 0);
 120         truncate_inode_pages(&inode_bl->i_data, 0);
 121
 122         /* Wait for all existing dio workers */
 123         ext4_inode_block_unlocked_dio(inode);
 124         ext4_inode_block_unlocked_dio(inode_bl);
 125         inode_dio_wait(inode);
 126         inode_dio_wait(inode_bl);
 127
 128         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 129         if (IS_ERR(handle)) {
 130                 err = -EINVAL;
 131                 goto journal_err_out;
 132         }
 133
 134         /* Protect extent tree against block allocations via delalloc */
 135         ext4_double_down_write_data_sem(inode, inode_bl);
 136
 137         if (inode_bl->i_nlink == 0) {
 138                 /* this inode has never been used as a BOOT_LOADER */
 139                 set_nlink(inode_bl, 1);
 140                 i_uid_write(inode_bl, 0);
 141                 i_gid_write(inode_bl, 0);
 142                 inode_bl->i_flags = 0;
 143                 ei_bl->i_flags = 0;
 144                 inode_bl->i_version = 1;
 145                 i_size_write(inode_bl, 0);
 146                 inode_bl->i_mode = S_IFREG;
 147                 if (ext4_has_feature_extents(sb)) {
 148                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 149                         ext4_ext_tree_init(handle, inode_bl);
 150                 } else
 151                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 152         }
 153
 154         swap_inode_data(inode, inode_bl);
 155
 156         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 157
 158         spin_lock(&sbi->s_next_gen_lock);
 159         inode->i_generation = sbi->s_next_generation++;
 160         inode_bl->i_generation = sbi->s_next_generation++;
 161         spin_unlock(&sbi->s_next_gen_lock);
 162
 163         ext4_discard_preallocations(inode);
 164
 165         err = ext4_mark_inode_dirty(handle, inode);
 166         if (err < 0) {
 167                 ext4_warning(inode->i_sb,
 168                         "couldn't mark inode #%lu dirty (err %d)",
 169                         inode->i_ino, err);
 170                 /* Revert all changes: */
 171                 swap_inode_data(inode, inode_bl);
 172         } else {
 173                 err = ext4_mark_inode_dirty(handle, inode_bl);
 174                 if (err < 0) {
 175                         ext4_warning(inode_bl->i_sb,
 176                                 "couldn't mark inode #%lu dirty (err %d)",
 177                                 inode_bl->i_ino, err);
 178                         /* Revert all changes: */
 179                         swap_inode_data(inode, inode_bl);
 180                         ext4_mark_inode_dirty(handle, inode);
 181                 }
 182         }
 183         ext4_journal_stop(handle);
 184         ext4_double_up_write_data_sem(inode, inode_bl);
 185
 186 journal_err_out:
 187         ext4_inode_resume_unlocked_dio(inode);
 188         ext4_inode_resume_unlocked_dio(inode_bl);
 189         unlock_two_nondirectories(inode, inode_bl);
 190         iput(inode_bl);
 191         return err;
 192 }
 193
 194 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 195 static int uuid_is_zero(__u8 u[16])
 196 {
 197         int     i;
 198
 199         for (i = 0; i < 16; i++)
 200                 if (u[i])
 201                         return 0;
 202         return 1;
 203 }
 204 #endif
 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                 err = ext4_truncate(inode);
 255                 if (err)
 256                         goto flags_out;
 257         }
 258
 259         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 260         if (IS_ERR(handle)) {
 261                 err = PTR_ERR(handle);
 262                 goto flags_out;
 263         }
 264         if (IS_SYNC(inode))
 265                 ext4_handle_sync(handle);
 266         err = ext4_reserve_inode_write(handle, inode, &iloc);
 267         if (err)
 268                 goto flags_err;
 269
 270         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 271                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 272                         continue;
 273                 /* These flags get special treatment later */
 274                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 275                         continue;
 276                 if (mask & flags)
 277                         ext4_set_inode_flag(inode, i);
 278                 else
 279                         ext4_clear_inode_flag(inode, i);
 280         }
 281
 282         ext4_set_inode_flags(inode);
 283         inode->i_ctime = current_time(inode);
 284
 285         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 286 flags_err:
 287         ext4_journal_stop(handle);
 288         if (err)
 289                 goto flags_out;
 290
 291         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 292                 err = ext4_change_inode_journal_flag(inode, jflag);
 293         if (err)
 294                 goto flags_out;
 295         if (migrate) {
 296                 if (flags & EXT4_EXTENTS_FL)
 297                         err = ext4_ext_migrate(inode);
 298                 else
 299                         err = ext4_ind_migrate(inode);
 300         }
 301
 302 flags_out:
 303         return err;
 304 }
 305
 306 #ifdef CONFIG_QUOTA
 307 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 308 {
 309         struct inode *inode = file_inode(filp);
 310         struct super_block *sb = inode->i_sb;
 311         struct ext4_inode_info *ei = EXT4_I(inode);
 312         int err, rc;
 313         handle_t *handle;
 314         kprojid_t kprojid;
 315         struct ext4_iloc iloc;
 316         struct ext4_inode *raw_inode;
 317         struct dquot *transfer_to[MAXQUOTAS] = { };
 318
 319         if (!ext4_has_feature_project(sb)) {
 320                 if (projid != EXT4_DEF_PROJID)
 321                         return -EOPNOTSUPP;
 322                 else
 323                         return 0;
 324         }
 325
 326         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 327                 return -EOPNOTSUPP;
 328
 329         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 330
 331         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 332                 return 0;
 333
 334         err = mnt_want_write_file(filp);
 335         if (err)
 336                 return err;
 337
 338         err = -EPERM;
 339         inode_lock(inode);
 340         /* Is it quota file? Do not allow user to mess with it */
 341         if (IS_NOQUOTA(inode))
 342                 goto out_unlock;
 343
 344         err = ext4_get_inode_loc(inode, &iloc);
 345         if (err)
 346                 goto out_unlock;
 347
 348         raw_inode = ext4_raw_inode(&iloc);
 349         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 350                 err = -EOVERFLOW;
 351                 brelse(iloc.bh);
 352                 goto out_unlock;
 353         }
 354         brelse(iloc.bh);
 355
 356         dquot_initialize(inode);
 357
 358         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 359                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 360                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 361         if (IS_ERR(handle)) {
 362                 err = PTR_ERR(handle);
 363                 goto out_unlock;
 364         }
 365
 366         err = ext4_reserve_inode_write(handle, inode, &iloc);
 367         if (err)
 368                 goto out_stop;
 369
 370         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 371         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 372                 err = __dquot_transfer(inode, transfer_to);
 373                 dqput(transfer_to[PRJQUOTA]);
 374                 if (err)
 375                         goto out_dirty;
 376         }
 377
 378         EXT4_I(inode)->i_projid = kprojid;
 379         inode->i_ctime = current_time(inode);
 380 out_dirty:
 381         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 382         if (!err)
 383                 err = rc;
 384 out_stop:
 385         ext4_journal_stop(handle);
 386 out_unlock:
 387         inode_unlock(inode);
 388         mnt_drop_write_file(filp);
 389         return err;
 390 }
 391 #else
 392 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 393 {
 394         if (projid != EXT4_DEF_PROJID)
 395                 return -EOPNOTSUPP;
 396         return 0;
 397 }
 398 #endif
 399
 400 /* Transfer internal flags to xflags */
 401 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 402 {
 403         __u32 xflags = 0;
 404
 405         if (iflags & EXT4_SYNC_FL)
 406                 xflags |= FS_XFLAG_SYNC;
 407         if (iflags & EXT4_IMMUTABLE_FL)
 408                 xflags |= FS_XFLAG_IMMUTABLE;
 409         if (iflags & EXT4_APPEND_FL)
 410                 xflags |= FS_XFLAG_APPEND;
 411         if (iflags & EXT4_NODUMP_FL)
 412                 xflags |= FS_XFLAG_NODUMP;
 413         if (iflags & EXT4_NOATIME_FL)
 414                 xflags |= FS_XFLAG_NOATIME;
 415         if (iflags & EXT4_PROJINHERIT_FL)
 416                 xflags |= FS_XFLAG_PROJINHERIT;
 417         return xflags;
 418 }
 419
 420 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 421                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 422                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 423
 424 /* Transfer xflags flags to internal */
 425 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 426 {
 427         unsigned long iflags = 0;
 428
 429         if (xflags & FS_XFLAG_SYNC)
 430                 iflags |= EXT4_SYNC_FL;
 431         if (xflags & FS_XFLAG_IMMUTABLE)
 432                 iflags |= EXT4_IMMUTABLE_FL;
 433         if (xflags & FS_XFLAG_APPEND)
 434                 iflags |= EXT4_APPEND_FL;
 435         if (xflags & FS_XFLAG_NODUMP)
 436                 iflags |= EXT4_NODUMP_FL;
 437         if (xflags & FS_XFLAG_NOATIME)
 438                 iflags |= EXT4_NOATIME_FL;
 439         if (xflags & FS_XFLAG_PROJINHERIT)
 440                 iflags |= EXT4_PROJINHERIT_FL;
 441
 442         return iflags;
 443 }
 444
 445 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 446 {
 447         struct inode *inode = file_inode(filp);
 448         struct super_block *sb = inode->i_sb;
 449         struct ext4_inode_info *ei = EXT4_I(inode);
 450         unsigned int flags;
 451
 452         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 453
 454         switch (cmd) {
 455         case EXT4_IOC_GETFLAGS:
 456                 ext4_get_inode_flags(ei);
 457                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 458                 return put_user(flags, (int __user *) arg);
 459         case EXT4_IOC_SETFLAGS: {
 460                 int err;
 461
 462                 if (!inode_owner_or_capable(inode))
 463                         return -EACCES;
 464
 465                 if (get_user(flags, (int __user *) arg))
 466                         return -EFAULT;
 467
 468                 if (flags & ~EXT4_FL_USER_VISIBLE)
 469                         return -EOPNOTSUPP;
 470                 /*
 471                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 472                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 473                  * more restrictive than just silently masking off visible but
 474                  * not settable flags as we always did.
 475                  */
 476                 flags &= EXT4_FL_USER_MODIFIABLE;
 477                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 478                         return -EOPNOTSUPP;
 479
 480                 err = mnt_want_write_file(filp);
 481                 if (err)
 482                         return err;
 483
 484                 inode_lock(inode);
 485                 err = ext4_ioctl_setflags(inode, flags);
 486                 inode_unlock(inode);
 487                 mnt_drop_write_file(filp);
 488                 return err;
 489         }
 490         case EXT4_IOC_GETVERSION:
 491         case EXT4_IOC_GETVERSION_OLD:
 492                 return put_user(inode->i_generation, (int __user *) arg);
 493         case EXT4_IOC_SETVERSION:
 494         case EXT4_IOC_SETVERSION_OLD: {
 495                 handle_t *handle;
 496                 struct ext4_iloc iloc;
 497                 __u32 generation;
 498                 int err;
 499
 500                 if (!inode_owner_or_capable(inode))
 501                         return -EPERM;
 502
 503                 if (ext4_has_metadata_csum(inode->i_sb)) {
 504                         ext4_warning(sb, "Setting inode version is not "
 505                                      "supported with metadata_csum enabled.");
 506                         return -ENOTTY;
 507                 }
 508
 509                 err = mnt_want_write_file(filp);
 510                 if (err)
 511                         return err;
 512                 if (get_user(generation, (int __user *) arg)) {
 513                         err = -EFAULT;
 514                         goto setversion_out;
 515                 }
 516
 517                 inode_lock(inode);
 518                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 519                 if (IS_ERR(handle)) {
 520                         err = PTR_ERR(handle);
 521                         goto unlock_out;
 522                 }
 523                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 524                 if (err == 0) {
 525                         inode->i_ctime = current_time(inode);
 526                         inode->i_generation = generation;
 527                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 528                 }
 529                 ext4_journal_stop(handle);
 530
 531 unlock_out:
 532                 inode_unlock(inode);
 533 setversion_out:
 534                 mnt_drop_write_file(filp);
 535                 return err;
 536         }
 537         case EXT4_IOC_GROUP_EXTEND: {
 538                 ext4_fsblk_t n_blocks_count;
 539                 int err, err2=0;
 540
 541                 err = ext4_resize_begin(sb);
 542                 if (err)
 543                         return err;
 544
 545                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 546                         err = -EFAULT;
 547                         goto group_extend_out;
 548                 }
 549
 550                 if (ext4_has_feature_bigalloc(sb)) {
 551                         ext4_msg(sb, KERN_ERR,
 552                                  "Online resizing not supported with bigalloc");
 553                         err = -EOPNOTSUPP;
 554                         goto group_extend_out;
 555                 }
 556
 557                 err = mnt_want_write_file(filp);
 558                 if (err)
 559                         goto group_extend_out;
 560
 561                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 562                 if (EXT4_SB(sb)->s_journal) {
 563                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 564                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 565                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 566                 }
 567                 if (err == 0)
 568                         err = err2;
 569                 mnt_drop_write_file(filp);
 570 group_extend_out:
 571                 ext4_resize_end(sb);
 572                 return err;
 573         }
 574
 575         case EXT4_IOC_MOVE_EXT: {
 576                 struct move_extent me;
 577                 struct fd donor;
 578                 int err;
 579
 580                 if (!(filp->f_mode & FMODE_READ) ||
 581                     !(filp->f_mode & FMODE_WRITE))
 582                         return -EBADF;
 583
 584                 if (copy_from_user(&me,
 585                         (struct move_extent __user *)arg, sizeof(me)))
 586                         return -EFAULT;
 587                 me.moved_len = 0;
 588
 589                 donor = fdget(me.donor_fd);
 590                 if (!donor.file)
 591                         return -EBADF;
 592
 593                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 594                         err = -EBADF;
 595                         goto mext_out;
 596                 }
 597
 598                 if (ext4_has_feature_bigalloc(sb)) {
 599                         ext4_msg(sb, KERN_ERR,
 600                                  "Online defrag not supported with bigalloc");
 601                         err = -EOPNOTSUPP;
 602                         goto mext_out;
 603                 } else if (IS_DAX(inode)) {
 604                         ext4_msg(sb, KERN_ERR,
 605                                  "Online defrag not supported with DAX");
 606                         err = -EOPNOTSUPP;
 607                         goto mext_out;
 608                 }
 609
 610                 err = mnt_want_write_file(filp);
 611                 if (err)
 612                         goto mext_out;
 613
 614                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 615                                         me.donor_start, me.len, &me.moved_len);
 616                 mnt_drop_write_file(filp);
 617
 618                 if (copy_to_user((struct move_extent __user *)arg,
 619                                  &me, sizeof(me)))
 620                         err = -EFAULT;
 621 mext_out:
 622                 fdput(donor);
 623                 return err;
 624         }
 625
 626         case EXT4_IOC_GROUP_ADD: {
 627                 struct ext4_new_group_data input;
 628                 int err, err2=0;
 629
 630                 err = ext4_resize_begin(sb);
 631                 if (err)
 632                         return err;
 633
 634                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 635                                 sizeof(input))) {
 636                         err = -EFAULT;
 637                         goto group_add_out;
 638                 }
 639
 640                 if (ext4_has_feature_bigalloc(sb)) {
 641                         ext4_msg(sb, KERN_ERR,
 642                                  "Online resizing not supported with bigalloc");
 643                         err = -EOPNOTSUPP;
 644                         goto group_add_out;
 645                 }
 646
 647                 err = mnt_want_write_file(filp);
 648                 if (err)
 649                         goto group_add_out;
 650
 651                 err = ext4_group_add(sb, &input);
 652                 if (EXT4_SB(sb)->s_journal) {
 653                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 654                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 655                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 656                 }
 657                 if (err == 0)
 658                         err = err2;
 659                 mnt_drop_write_file(filp);
 660                 if (!err && ext4_has_group_desc_csum(sb) &&
 661                     test_opt(sb, INIT_INODE_TABLE))
 662                         err = ext4_register_li_request(sb, input.group);
 663 group_add_out:
 664                 ext4_resize_end(sb);
 665                 return err;
 666         }
 667
 668         case EXT4_IOC_MIGRATE:
 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                 /*
 678                  * inode_mutex prevent write and truncate on the file.
 679                  * Read still goes through. We take i_data_sem in
 680                  * ext4_ext_swap_inode_data before we switch the
 681                  * inode format to prevent read.
 682                  */
 683                 inode_lock((inode));
 684                 err = ext4_ext_migrate(inode);
 685                 inode_unlock((inode));
 686                 mnt_drop_write_file(filp);
 687                 return err;
 688         }
 689
 690         case EXT4_IOC_ALLOC_DA_BLKS:
 691         {
 692                 int err;
 693                 if (!inode_owner_or_capable(inode))
 694                         return -EACCES;
 695
 696                 err = mnt_want_write_file(filp);
 697                 if (err)
 698                         return err;
 699                 err = ext4_alloc_da_blocks(inode);
 700                 mnt_drop_write_file(filp);
 701                 return err;
 702         }
 703
 704         case EXT4_IOC_SWAP_BOOT:
 705         {
 706                 int err;
 707                 if (!(filp->f_mode & FMODE_WRITE))
 708                         return -EBADF;
 709                 err = mnt_want_write_file(filp);
 710                 if (err)
 711                         return err;
 712                 err = swap_inode_boot_loader(sb, inode);
 713                 mnt_drop_write_file(filp);
 714                 return err;
 715         }
 716
 717         case EXT4_IOC_RESIZE_FS: {
 718                 ext4_fsblk_t n_blocks_count;
 719                 int err = 0, err2 = 0;
 720                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 721
 722                 if (ext4_has_feature_bigalloc(sb)) {
 723                         ext4_msg(sb, KERN_ERR,
 724                                  "Online resizing not (yet) supported with bigalloc");
 725                         return -EOPNOTSUPP;
 726                 }
 727
 728                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 729                                    sizeof(__u64))) {
 730                         return -EFAULT;
 731                 }
 732
 733                 err = ext4_resize_begin(sb);
 734                 if (err)
 735                         return err;
 736
 737                 err = mnt_want_write_file(filp);
 738                 if (err)
 739                         goto resizefs_out;
 740
 741                 err = ext4_resize_fs(sb, n_blocks_count);
 742                 if (EXT4_SB(sb)->s_journal) {
 743                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 744                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 745                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 746                 }
 747                 if (err == 0)
 748                         err = err2;
 749                 mnt_drop_write_file(filp);
 750                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 751                     ext4_has_group_desc_csum(sb) &&
 752                     test_opt(sb, INIT_INODE_TABLE))
 753                         err = ext4_register_li_request(sb, o_group);
 754
 755 resizefs_out:
 756                 ext4_resize_end(sb);
 757                 return err;
 758         }
 759
 760         case FITRIM:
 761         {
 762                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 763                 struct fstrim_range range;
 764                 int ret = 0;
 765
 766                 if (!capable(CAP_SYS_ADMIN))
 767                         return -EPERM;
 768
 769                 if (!blk_queue_discard(q))
 770                         return -EOPNOTSUPP;
 771
 772                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 773                     sizeof(range)))
 774                         return -EFAULT;
 775
 776                 range.minlen = max((unsigned int)range.minlen,
 777                                    q->limits.discard_granularity);
 778                 ret = ext4_trim_fs(sb, &range);
 779                 if (ret < 0)
 780                         return ret;
 781
 782                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 783                     sizeof(range)))
 784                         return -EFAULT;
 785
 786                 return 0;
 787         }
 788         case EXT4_IOC_PRECACHE_EXTENTS:
 789                 return ext4_ext_precache(inode);
 790
 791         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 792                 if (!ext4_has_feature_encrypt(sb))
 793                         return -EOPNOTSUPP;
 794                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 795
 796         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 797 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 798                 int err, err2;
 799                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 800                 handle_t *handle;
 801
 802                 if (!ext4_has_feature_encrypt(sb))
 803                         return -EOPNOTSUPP;
 804                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 805                         err = mnt_want_write_file(filp);
 806                         if (err)
 807                                 return err;
 808                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 809                         if (IS_ERR(handle)) {
 810                                 err = PTR_ERR(handle);
 811                                 goto pwsalt_err_exit;
 812                         }
 813                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 814                         if (err)
 815                                 goto pwsalt_err_journal;
 816                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 817                         err = ext4_handle_dirty_metadata(handle, NULL,
 818                                                          sbi->s_sbh);
 819                 pwsalt_err_journal:
 820                         err2 = ext4_journal_stop(handle);
 821                         if (err2 && !err)
 822                                 err = err2;
 823                 pwsalt_err_exit:
 824                         mnt_drop_write_file(filp);
 825                         if (err)
 826                                 return err;
 827                 }
 828                 if (copy_to_user((void __user *) arg,
 829                                  sbi->s_es->s_encrypt_pw_salt, 16))
 830                         return -EFAULT;
 831                 return 0;
 832 #else
 833                 return -EOPNOTSUPP;
 834 #endif
 835         }
 836         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 837                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 838
 839         case EXT4_IOC_FSGETXATTR:
 840         {
 841                 struct fsxattr fa;
 842
 843                 memset(&fa, 0, sizeof(struct fsxattr));
 844                 ext4_get_inode_flags(ei);
 845                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 846
 847                 if (ext4_has_feature_project(inode->i_sb)) {
 848                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 849                                 EXT4_I(inode)->i_projid);
 850                 }
 851
 852                 if (copy_to_user((struct fsxattr __user *)arg,
 853                                  &fa, sizeof(fa)))
 854                         return -EFAULT;
 855                 return 0;
 856         }
 857         case EXT4_IOC_FSSETXATTR:
 858         {
 859                 struct fsxattr fa;
 860                 int err;
 861
 862                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 863                                    sizeof(fa)))
 864                         return -EFAULT;
 865
 866                 /* Make sure caller has proper permission */
 867                 if (!inode_owner_or_capable(inode))
 868                         return -EACCES;
 869
 870                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
 871                         return -EOPNOTSUPP;
 872
 873                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
 874                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 875                         return -EOPNOTSUPP;
 876
 877                 err = mnt_want_write_file(filp);
 878                 if (err)
 879                         return err;
 880
 881                 inode_lock(inode);
 882                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
 883                          (flags & EXT4_FL_XFLAG_VISIBLE);
 884                 err = ext4_ioctl_setflags(inode, flags);
 885                 inode_unlock(inode);
 886                 mnt_drop_write_file(filp);
 887                 if (err)
 888                         return err;
 889
 890                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
 891                 if (err)
 892                         return err;
 893
 894                 return 0;
 895         }
 896         default:
 897                 return -ENOTTY;
 898         }
 899 }
 900
 901 #ifdef CONFIG_COMPAT
 902 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 903 {
 904         /* These are just misnamed, they actually get/put from/to user an int */
 905         switch (cmd) {
 906         case EXT4_IOC32_GETFLAGS:
 907                 cmd = EXT4_IOC_GETFLAGS;
 908                 break;
 909         case EXT4_IOC32_SETFLAGS:
 910                 cmd = EXT4_IOC_SETFLAGS;
 911                 break;
 912         case EXT4_IOC32_GETVERSION:
 913                 cmd = EXT4_IOC_GETVERSION;
 914                 break;
 915         case EXT4_IOC32_SETVERSION:
 916                 cmd = EXT4_IOC_SETVERSION;
 917                 break;
 918         case EXT4_IOC32_GROUP_EXTEND:
 919                 cmd = EXT4_IOC_GROUP_EXTEND;
 920                 break;
 921         case EXT4_IOC32_GETVERSION_OLD:
 922                 cmd = EXT4_IOC_GETVERSION_OLD;
 923                 break;
 924         case EXT4_IOC32_SETVERSION_OLD:
 925                 cmd = EXT4_IOC_SETVERSION_OLD;
 926                 break;
 927         case EXT4_IOC32_GETRSVSZ:
 928                 cmd = EXT4_IOC_GETRSVSZ;
 929                 break;
 930         case EXT4_IOC32_SETRSVSZ:
 931                 cmd = EXT4_IOC_SETRSVSZ;
 932                 break;
 933         case EXT4_IOC32_GROUP_ADD: {
 934                 struct compat_ext4_new_group_input __user *uinput;
 935                 struct ext4_new_group_input input;
 936                 mm_segment_t old_fs;
 937                 int err;
 938
 939                 uinput = compat_ptr(arg);
 940                 err = get_user(input.group, &uinput->group);
 941                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 942                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 943                 err |= get_user(input.inode_table, &uinput->inode_table);
 944                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 945                 err |= get_user(input.reserved_blocks,
 946                                 &uinput->reserved_blocks);
 947                 if (err)
 948                         return -EFAULT;
 949                 old_fs = get_fs();
 950                 set_fs(KERNEL_DS);
 951                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 952                                  (unsigned long) &input);
 953                 set_fs(old_fs);
 954                 return err;
 955         }
 956         case EXT4_IOC_MOVE_EXT:
 957         case EXT4_IOC_RESIZE_FS:
 958         case EXT4_IOC_PRECACHE_EXTENTS:
 959         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 960         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
 961         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 962                 break;
 963         default:
 964                 return -ENOIOCTLCMD;
 965         }
 966         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 967 }
 968 #endif