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 /**
  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, EXT4_IGET_SPECIAL);
 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 = ext4_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 static int uuid_is_zero(__u8 u[16])
 195 {
 196         int     i;
 197
 198         for (i = 0; i < 16; i++)
 199                 if (u[i])
 200                         return 0;
 201         return 1;
 202 }
 203
 204 static int ext4_ioctl_setflags(struct inode *inode,
 205                                unsigned int flags)
 206 {
 207         struct ext4_inode_info *ei = EXT4_I(inode);
 208         handle_t *handle = NULL;
 209         int err = -EPERM, migrate = 0;
 210         struct ext4_iloc iloc;
 211         unsigned int oldflags, mask, i;
 212         unsigned int jflag;
 213
 214         /* Is it quota file? Do not allow user to mess with it */
 215         if (IS_NOQUOTA(inode))
 216                 goto flags_out;
 217
 218         oldflags = ei->i_flags;
 219
 220         /* The JOURNAL_DATA flag is modifiable only by root */
 221         jflag = flags & EXT4_JOURNAL_DATA_FL;
 222
 223         /*
 224          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 225          * the relevant capability.
 226          *
 227          * This test looks nicer. Thanks to Pauline Middelink
 228          */
 229         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 230                 if (!capable(CAP_LINUX_IMMUTABLE))
 231                         goto flags_out;
 232         }
 233
 234         /*
 235          * The JOURNAL_DATA flag can only be changed by
 236          * the relevant capability.
 237          */
 238         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 239                 if (!capable(CAP_SYS_RESOURCE))
 240                         goto flags_out;
 241         }
 242         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 243                 migrate = 1;
 244
 245         if (flags & EXT4_EOFBLOCKS_FL) {
 246                 /* we don't support adding EOFBLOCKS flag */
 247                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 248                         err = -EOPNOTSUPP;
 249                         goto flags_out;
 250                 }
 251         } else if (oldflags & EXT4_EOFBLOCKS_FL)
 252                 ext4_truncate(inode);
 253
 254         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 255         if (IS_ERR(handle)) {
 256                 err = PTR_ERR(handle);
 257                 goto flags_out;
 258         }
 259         if (IS_SYNC(inode))
 260                 ext4_handle_sync(handle);
 261         err = ext4_reserve_inode_write(handle, inode, &iloc);
 262         if (err)
 263                 goto flags_err;
 264
 265         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 266                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 267                         continue;
 268                 if (mask & flags)
 269                         ext4_set_inode_flag(inode, i);
 270                 else
 271                         ext4_clear_inode_flag(inode, i);
 272         }
 273
 274         ext4_set_inode_flags(inode);
 275         inode->i_ctime = ext4_current_time(inode);
 276
 277         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 278 flags_err:
 279         ext4_journal_stop(handle);
 280         if (err)
 281                 goto flags_out;
 282
 283         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 284                 err = ext4_change_inode_journal_flag(inode, jflag);
 285         if (err)
 286                 goto flags_out;
 287         if (migrate) {
 288                 if (flags & EXT4_EXTENTS_FL)
 289                         err = ext4_ext_migrate(inode);
 290                 else
 291                         err = ext4_ind_migrate(inode);
 292         }
 293
 294 flags_out:
 295         return err;
 296 }
 297
 298 #ifdef CONFIG_QUOTA
 299 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 300 {
 301         struct inode *inode = file_inode(filp);
 302         struct super_block *sb = inode->i_sb;
 303         struct ext4_inode_info *ei = EXT4_I(inode);
 304         int err, rc;
 305         handle_t *handle;
 306         kprojid_t kprojid;
 307         struct ext4_iloc iloc;
 308         struct ext4_inode *raw_inode;
 309         struct dquot *transfer_to[MAXQUOTAS] = { };
 310
 311         if (!ext4_has_feature_project(sb)) {
 312                 if (projid != EXT4_DEF_PROJID)
 313                         return -EOPNOTSUPP;
 314                 else
 315                         return 0;
 316         }
 317
 318         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 319                 return -EOPNOTSUPP;
 320
 321         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 322
 323         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 324                 return 0;
 325
 326         err = mnt_want_write_file(filp);
 327         if (err)
 328                 return err;
 329
 330         err = -EPERM;
 331         inode_lock(inode);
 332         /* Is it quota file? Do not allow user to mess with it */
 333         if (IS_NOQUOTA(inode))
 334                 goto out_unlock;
 335
 336         err = ext4_get_inode_loc(inode, &iloc);
 337         if (err)
 338                 goto out_unlock;
 339
 340         raw_inode = ext4_raw_inode(&iloc);
 341         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 342                 err = -EOVERFLOW;
 343                 brelse(iloc.bh);
 344                 goto out_unlock;
 345         }
 346         brelse(iloc.bh);
 347
 348         err = dquot_initialize(inode);
 349         if (err)
 350                 return err;
 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         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 365         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 366                 err = __dquot_transfer(inode, transfer_to);
 367                 dqput(transfer_to[PRJQUOTA]);
 368                 if (err)
 369                         goto out_dirty;
 370         }
 371
 372         EXT4_I(inode)->i_projid = kprojid;
 373         inode->i_ctime = ext4_current_time(inode);
 374 out_dirty:
 375         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 376         if (!err)
 377                 err = rc;
 378 out_stop:
 379         ext4_journal_stop(handle);
 380 out_unlock:
 381         inode_unlock(inode);
 382         mnt_drop_write_file(filp);
 383         return err;
 384 }
 385 #else
 386 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 387 {
 388         if (projid != EXT4_DEF_PROJID)
 389                 return -EOPNOTSUPP;
 390         return 0;
 391 }
 392 #endif
 393
 394 /* Transfer internal flags to xflags */
 395 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 396 {
 397         __u32 xflags = 0;
 398
 399         if (iflags & EXT4_SYNC_FL)
 400                 xflags |= FS_XFLAG_SYNC;
 401         if (iflags & EXT4_IMMUTABLE_FL)
 402                 xflags |= FS_XFLAG_IMMUTABLE;
 403         if (iflags & EXT4_APPEND_FL)
 404                 xflags |= FS_XFLAG_APPEND;
 405         if (iflags & EXT4_NODUMP_FL)
 406                 xflags |= FS_XFLAG_NODUMP;
 407         if (iflags & EXT4_NOATIME_FL)
 408                 xflags |= FS_XFLAG_NOATIME;
 409         if (iflags & EXT4_PROJINHERIT_FL)
 410                 xflags |= FS_XFLAG_PROJINHERIT;
 411         return xflags;
 412 }
 413
 414 /* Transfer xflags flags to internal */
 415 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 416 {
 417         unsigned long iflags = 0;
 418
 419         if (xflags & FS_XFLAG_SYNC)
 420                 iflags |= EXT4_SYNC_FL;
 421         if (xflags & FS_XFLAG_IMMUTABLE)
 422                 iflags |= EXT4_IMMUTABLE_FL;
 423         if (xflags & FS_XFLAG_APPEND)
 424                 iflags |= EXT4_APPEND_FL;
 425         if (xflags & FS_XFLAG_NODUMP)
 426                 iflags |= EXT4_NODUMP_FL;
 427         if (xflags & FS_XFLAG_NOATIME)
 428                 iflags |= EXT4_NOATIME_FL;
 429         if (xflags & FS_XFLAG_PROJINHERIT)
 430                 iflags |= EXT4_PROJINHERIT_FL;
 431
 432         return iflags;
 433 }
 434
 435 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 436 {
 437         struct inode *inode = file_inode(filp);
 438         struct super_block *sb = inode->i_sb;
 439         struct ext4_inode_info *ei = EXT4_I(inode);
 440         unsigned int flags;
 441
 442         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 443
 444         switch (cmd) {
 445         case EXT4_IOC_GETFLAGS:
 446                 ext4_get_inode_flags(ei);
 447                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 448                 return put_user(flags, (int __user *) arg);
 449         case EXT4_IOC_SETFLAGS: {
 450                 int err;
 451
 452                 if (!inode_owner_or_capable(inode))
 453                         return -EACCES;
 454
 455                 if (get_user(flags, (int __user *) arg))
 456                         return -EFAULT;
 457
 458                 err = mnt_want_write_file(filp);
 459                 if (err)
 460                         return err;
 461
 462                 flags = ext4_mask_flags(inode->i_mode, flags);
 463
 464                 inode_lock(inode);
 465                 err = ext4_ioctl_setflags(inode, flags);
 466                 inode_unlock(inode);
 467                 mnt_drop_write_file(filp);
 468                 return err;
 469         }
 470         case EXT4_IOC_GETVERSION:
 471         case EXT4_IOC_GETVERSION_OLD:
 472                 return put_user(inode->i_generation, (int __user *) arg);
 473         case EXT4_IOC_SETVERSION:
 474         case EXT4_IOC_SETVERSION_OLD: {
 475                 handle_t *handle;
 476                 struct ext4_iloc iloc;
 477                 __u32 generation;
 478                 int err;
 479
 480                 if (!inode_owner_or_capable(inode))
 481                         return -EPERM;
 482
 483                 if (ext4_has_metadata_csum(inode->i_sb)) {
 484                         ext4_warning(sb, "Setting inode version is not "
 485                                      "supported with metadata_csum enabled.");
 486                         return -ENOTTY;
 487                 }
 488
 489                 err = mnt_want_write_file(filp);
 490                 if (err)
 491                         return err;
 492                 if (get_user(generation, (int __user *) arg)) {
 493                         err = -EFAULT;
 494                         goto setversion_out;
 495                 }
 496
 497                 inode_lock(inode);
 498                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 499                 if (IS_ERR(handle)) {
 500                         err = PTR_ERR(handle);
 501                         goto unlock_out;
 502                 }
 503                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 504                 if (err == 0) {
 505                         inode->i_ctime = ext4_current_time(inode);
 506                         inode->i_generation = generation;
 507                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 508                 }
 509                 ext4_journal_stop(handle);
 510
 511 unlock_out:
 512                 inode_unlock(inode);
 513 setversion_out:
 514                 mnt_drop_write_file(filp);
 515                 return err;
 516         }
 517         case EXT4_IOC_GROUP_EXTEND: {
 518                 ext4_fsblk_t n_blocks_count;
 519                 int err, err2=0;
 520
 521                 err = ext4_resize_begin(sb);
 522                 if (err)
 523                         return err;
 524
 525                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 526                         err = -EFAULT;
 527                         goto group_extend_out;
 528                 }
 529
 530                 if (ext4_has_feature_bigalloc(sb)) {
 531                         ext4_msg(sb, KERN_ERR,
 532                                  "Online resizing not supported with bigalloc");
 533                         err = -EOPNOTSUPP;
 534                         goto group_extend_out;
 535                 }
 536
 537                 err = mnt_want_write_file(filp);
 538                 if (err)
 539                         goto group_extend_out;
 540
 541                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 542                 if (EXT4_SB(sb)->s_journal) {
 543                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 544                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 545                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 546                 }
 547                 if (err == 0)
 548                         err = err2;
 549                 mnt_drop_write_file(filp);
 550 group_extend_out:
 551                 ext4_resize_end(sb);
 552                 return err;
 553         }
 554
 555         case EXT4_IOC_MOVE_EXT: {
 556                 struct move_extent me;
 557                 struct fd donor;
 558                 int err;
 559
 560                 if (!(filp->f_mode & FMODE_READ) ||
 561                     !(filp->f_mode & FMODE_WRITE))
 562                         return -EBADF;
 563
 564                 if (copy_from_user(&me,
 565                         (struct move_extent __user *)arg, sizeof(me)))
 566                         return -EFAULT;
 567                 me.moved_len = 0;
 568
 569                 donor = fdget(me.donor_fd);
 570                 if (!donor.file)
 571                         return -EBADF;
 572
 573                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 574                         err = -EBADF;
 575                         goto mext_out;
 576                 }
 577
 578                 if (ext4_has_feature_bigalloc(sb)) {
 579                         ext4_msg(sb, KERN_ERR,
 580                                  "Online defrag not supported with bigalloc");
 581                         err = -EOPNOTSUPP;
 582                         goto mext_out;
 583                 } else if (IS_DAX(inode)) {
 584                         ext4_msg(sb, KERN_ERR,
 585                                  "Online defrag not supported with DAX");
 586                         err = -EOPNOTSUPP;
 587                         goto mext_out;
 588                 }
 589
 590                 err = mnt_want_write_file(filp);
 591                 if (err)
 592                         goto mext_out;
 593
 594                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 595                                         me.donor_start, me.len, &me.moved_len);
 596                 mnt_drop_write_file(filp);
 597
 598                 if (copy_to_user((struct move_extent __user *)arg,
 599                                  &me, sizeof(me)))
 600                         err = -EFAULT;
 601 mext_out:
 602                 fdput(donor);
 603                 return err;
 604         }
 605
 606         case EXT4_IOC_GROUP_ADD: {
 607                 struct ext4_new_group_data input;
 608                 int err, err2=0;
 609
 610                 err = ext4_resize_begin(sb);
 611                 if (err)
 612                         return err;
 613
 614                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 615                                 sizeof(input))) {
 616                         err = -EFAULT;
 617                         goto group_add_out;
 618                 }
 619
 620                 if (ext4_has_feature_bigalloc(sb)) {
 621                         ext4_msg(sb, KERN_ERR,
 622                                  "Online resizing not supported with bigalloc");
 623                         err = -EOPNOTSUPP;
 624                         goto group_add_out;
 625                 }
 626
 627                 err = mnt_want_write_file(filp);
 628                 if (err)
 629                         goto group_add_out;
 630
 631                 err = ext4_group_add(sb, &input);
 632                 if (EXT4_SB(sb)->s_journal) {
 633                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 634                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 635                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 636                 }
 637                 if (err == 0)
 638                         err = err2;
 639                 mnt_drop_write_file(filp);
 640                 if (!err && ext4_has_group_desc_csum(sb) &&
 641                     test_opt(sb, INIT_INODE_TABLE))
 642                         err = ext4_register_li_request(sb, input.group);
 643 group_add_out:
 644                 ext4_resize_end(sb);
 645                 return err;
 646         }
 647
 648         case EXT4_IOC_MIGRATE:
 649         {
 650                 int err;
 651                 if (!inode_owner_or_capable(inode))
 652                         return -EACCES;
 653
 654                 err = mnt_want_write_file(filp);
 655                 if (err)
 656                         return err;
 657                 /*
 658                  * inode_mutex prevent write and truncate on the file.
 659                  * Read still goes through. We take i_data_sem in
 660                  * ext4_ext_swap_inode_data before we switch the
 661                  * inode format to prevent read.
 662                  */
 663                 inode_lock((inode));
 664                 err = ext4_ext_migrate(inode);
 665                 inode_unlock((inode));
 666                 mnt_drop_write_file(filp);
 667                 return err;
 668         }
 669
 670         case EXT4_IOC_ALLOC_DA_BLKS:
 671         {
 672                 int err;
 673                 if (!inode_owner_or_capable(inode))
 674                         return -EACCES;
 675
 676                 err = mnt_want_write_file(filp);
 677                 if (err)
 678                         return err;
 679                 err = ext4_alloc_da_blocks(inode);
 680                 mnt_drop_write_file(filp);
 681                 return err;
 682         }
 683
 684         case EXT4_IOC_SWAP_BOOT:
 685         {
 686                 int err;
 687                 if (!(filp->f_mode & FMODE_WRITE))
 688                         return -EBADF;
 689                 err = mnt_want_write_file(filp);
 690                 if (err)
 691                         return err;
 692                 err = swap_inode_boot_loader(sb, inode);
 693                 mnt_drop_write_file(filp);
 694                 return err;
 695         }
 696
 697         case EXT4_IOC_RESIZE_FS: {
 698                 ext4_fsblk_t n_blocks_count;
 699                 int err = 0, err2 = 0;
 700                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 701
 702                 if (ext4_has_feature_bigalloc(sb)) {
 703                         ext4_msg(sb, KERN_ERR,
 704                                  "Online resizing not (yet) supported with bigalloc");
 705                         return -EOPNOTSUPP;
 706                 }
 707
 708                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 709                                    sizeof(__u64))) {
 710                         return -EFAULT;
 711                 }
 712
 713                 err = ext4_resize_begin(sb);
 714                 if (err)
 715                         return err;
 716
 717                 err = mnt_want_write_file(filp);
 718                 if (err)
 719                         goto resizefs_out;
 720
 721                 err = ext4_resize_fs(sb, n_blocks_count);
 722                 if (EXT4_SB(sb)->s_journal) {
 723                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 724                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 725                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 726                 }
 727                 if (err == 0)
 728                         err = err2;
 729                 mnt_drop_write_file(filp);
 730                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
 731                     ext4_has_group_desc_csum(sb) &&
 732                     test_opt(sb, INIT_INODE_TABLE))
 733                         err = ext4_register_li_request(sb, o_group);
 734
 735 resizefs_out:
 736                 ext4_resize_end(sb);
 737                 return err;
 738         }
 739
 740         case FITRIM:
 741         {
 742                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 743                 struct fstrim_range range;
 744                 int ret = 0;
 745
 746                 if (!capable(CAP_SYS_ADMIN))
 747                         return -EPERM;
 748
 749                 if (!blk_queue_discard(q))
 750                         return -EOPNOTSUPP;
 751
 752                 /*
 753                  * We haven't replayed the journal, so we cannot use our
 754                  * block-bitmap-guided storage zapping commands.
 755                  */
 756                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
 757                         return -EROFS;
 758
 759                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 760                     sizeof(range)))
 761                         return -EFAULT;
 762
 763                 ret = ext4_trim_fs(sb, &range);
 764                 if (ret < 0)
 765                         return ret;
 766
 767                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 768                     sizeof(range)))
 769                         return -EFAULT;
 770
 771                 return 0;
 772         }
 773         case EXT4_IOC_PRECACHE_EXTENTS:
 774                 return ext4_ext_precache(inode);
 775
 776         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 777                 if (!ext4_has_feature_encrypt(sb))
 778                         return -EOPNOTSUPP;
 779                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 780
 781         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 782                 int err, err2;
 783                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 784                 handle_t *handle;
 785
 786                 if (!ext4_sb_has_crypto(sb))
 787                         return -EOPNOTSUPP;
 788                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 789                         err = mnt_want_write_file(filp);
 790                         if (err)
 791                                 return err;
 792                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 793                         if (IS_ERR(handle)) {
 794                                 err = PTR_ERR(handle);
 795                                 goto pwsalt_err_exit;
 796                         }
 797                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 798                         if (err)
 799                                 goto pwsalt_err_journal;
 800                         lock_buffer(sbi->s_sbh);
 801                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 802                         ext4_superblock_csum_set(sb);
 803                         unlock_buffer(sbi->s_sbh);
 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                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 822
 823         case EXT4_IOC_FSGETXATTR:
 824         {
 825                 struct fsxattr fa;
 826
 827                 memset(&fa, 0, sizeof(struct fsxattr));
 828                 ext4_get_inode_flags(ei);
 829                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 830
 831                 if (ext4_has_feature_project(inode->i_sb)) {
 832                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 833                                 EXT4_I(inode)->i_projid);
 834                 }
 835
 836                 if (copy_to_user((struct fsxattr __user *)arg,
 837                                  &fa, sizeof(fa)))
 838                         return -EFAULT;
 839                 return 0;
 840         }
 841         case EXT4_IOC_FSSETXATTR:
 842         {
 843                 struct fsxattr fa;
 844                 int err;
 845
 846                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 847                                    sizeof(fa)))
 848                         return -EFAULT;
 849
 850                 /* Make sure caller has proper permission */
 851                 if (!inode_owner_or_capable(inode))
 852                         return -EACCES;
 853
 854                 err = mnt_want_write_file(filp);
 855                 if (err)
 856                         return err;
 857
 858                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
 859                 flags = ext4_mask_flags(inode->i_mode, flags);
 860
 861                 inode_lock(inode);
 862                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
 863                          (flags & EXT4_FL_XFLAG_VISIBLE);
 864                 err = ext4_ioctl_setflags(inode, flags);
 865                 inode_unlock(inode);
 866                 mnt_drop_write_file(filp);
 867                 if (err)
 868                         return err;
 869
 870                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
 871                 if (err)
 872                         return err;
 873
 874                 return 0;
 875         }
 876         default:
 877                 return -ENOTTY;
 878         }
 879 }
 880
 881 #ifdef CONFIG_COMPAT
 882 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 883 {
 884         /* These are just misnamed, they actually get/put from/to user an int */
 885         switch (cmd) {
 886         case EXT4_IOC32_GETFLAGS:
 887                 cmd = EXT4_IOC_GETFLAGS;
 888                 break;
 889         case EXT4_IOC32_SETFLAGS:
 890                 cmd = EXT4_IOC_SETFLAGS;
 891                 break;
 892         case EXT4_IOC32_GETVERSION:
 893                 cmd = EXT4_IOC_GETVERSION;
 894                 break;
 895         case EXT4_IOC32_SETVERSION:
 896                 cmd = EXT4_IOC_SETVERSION;
 897                 break;
 898         case EXT4_IOC32_GROUP_EXTEND:
 899                 cmd = EXT4_IOC_GROUP_EXTEND;
 900                 break;
 901         case EXT4_IOC32_GETVERSION_OLD:
 902                 cmd = EXT4_IOC_GETVERSION_OLD;
 903                 break;
 904         case EXT4_IOC32_SETVERSION_OLD:
 905                 cmd = EXT4_IOC_SETVERSION_OLD;
 906                 break;
 907         case EXT4_IOC32_GETRSVSZ:
 908                 cmd = EXT4_IOC_GETRSVSZ;
 909                 break;
 910         case EXT4_IOC32_SETRSVSZ:
 911                 cmd = EXT4_IOC_SETRSVSZ;
 912                 break;
 913         case EXT4_IOC32_GROUP_ADD: {
 914                 struct compat_ext4_new_group_input __user *uinput;
 915                 struct ext4_new_group_input input;
 916                 mm_segment_t old_fs;
 917                 int err;
 918
 919                 uinput = compat_ptr(arg);
 920                 err = get_user(input.group, &uinput->group);
 921                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 922                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 923                 err |= get_user(input.inode_table, &uinput->inode_table);
 924                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 925                 err |= get_user(input.reserved_blocks,
 926                                 &uinput->reserved_blocks);
 927                 if (err)
 928                         return -EFAULT;
 929                 old_fs = get_fs();
 930                 set_fs(KERNEL_DS);
 931                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 932                                  (unsigned long) &input);
 933                 set_fs(old_fs);
 934                 return err;
 935         }
 936         case EXT4_IOC_MOVE_EXT:
 937         case EXT4_IOC_RESIZE_FS:
 938         case EXT4_IOC_PRECACHE_EXTENTS:
 939         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 940         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
 941         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 942                 break;
 943         default:
 944                 return -ENOIOCTLCMD;
 945         }
 946         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
 947 }
 948 #endif