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 <linux/delay.h>
  20 #include "ext4_jbd2.h"
  21 #include "ext4.h"
  22
  23 /**
  24  * Swap memory between @a and @b for @len bytes.
  25  *
  26  * @a:          pointer to first memory area
  27  * @b:          pointer to second memory area
  28  * @len:        number of bytes to swap
  29  *
  30  */
  31 static void memswap(void *a, void *b, size_t len)
  32 {
  33         unsigned char *ap, *bp;
  34
  35         ap = (unsigned char *)a;
  36         bp = (unsigned char *)b;
  37         while (len-- > 0) {
  38                 swap(*ap, *bp);
  39                 ap++;
  40                 bp++;
  41         }
  42 }
  43
  44 /**
  45  * Swap i_data and associated attributes between @inode1 and @inode2.
  46  * This function is used for the primary swap between inode1 and inode2
  47  * and also to revert this primary swap in case of errors.
  48  *
  49  * Therefore you have to make sure, that calling this method twice
  50  * will revert all changes.
  51  *
  52  * @inode1:     pointer to first inode
  53  * @inode2:     pointer to second inode
  54  */
  55 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  56 {
  57         loff_t isize;
  58         struct ext4_inode_info *ei1;
  59         struct ext4_inode_info *ei2;
  60
  61         ei1 = EXT4_I(inode1);
  62         ei2 = EXT4_I(inode2);
  63
  64         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  65         memswap(&inode1->i_version, &inode2->i_version,
  66                   sizeof(inode1->i_version));
  67         memswap(&inode1->i_blocks, &inode2->i_blocks,
  68                   sizeof(inode1->i_blocks));
  69         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  70         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  71         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  72
  73         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  74         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  75         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  76         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  77         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  78
  79         isize = i_size_read(inode1);
  80         i_size_write(inode1, i_size_read(inode2));
  81         i_size_write(inode2, isize);
  82 }
  83
  84 /**
  85  * Swap the information from the given @inode and the inode
  86  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  87  * important fields of the inodes.
  88  *
  89  * @sb:         the super block of the filesystem
  90  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  91  *
  92  */
  93 static long swap_inode_boot_loader(struct super_block *sb,
  94                                 struct inode *inode)
  95 {
  96         handle_t *handle;
  97         int err;
  98         struct inode *inode_bl;
  99         struct ext4_inode_info *ei_bl;
 100         struct ext4_sb_info *sbi = EXT4_SB(sb);
 101
 102         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 103                 return -EINVAL;
 104
 105         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 106                 return -EPERM;
 107
 108         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 109         if (IS_ERR(inode_bl))
 110                 return PTR_ERR(inode_bl);
 111         ei_bl = EXT4_I(inode_bl);
 112
 113         filemap_flush(inode->i_mapping);
 114         filemap_flush(inode_bl->i_mapping);
 115
 116         /* Protect orig inodes against a truncate and make sure,
 117          * that only 1 swap_inode_boot_loader is running. */
 118         lock_two_nondirectories(inode, inode_bl);
 119
 120         truncate_inode_pages(&inode->i_data, 0);
 121         truncate_inode_pages(&inode_bl->i_data, 0);
 122
 123         /* Wait for all existing dio workers */
 124         ext4_inode_block_unlocked_dio(inode);
 125         ext4_inode_block_unlocked_dio(inode_bl);
 126         inode_dio_wait(inode);
 127         inode_dio_wait(inode_bl);
 128
 129         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 130         if (IS_ERR(handle)) {
 131                 err = -EINVAL;
 132                 goto journal_err_out;
 133         }
 134
 135         /* Protect extent tree against block allocations via delalloc */
 136         ext4_double_down_write_data_sem(inode, inode_bl);
 137
 138         if (inode_bl->i_nlink == 0) {
 139                 /* this inode has never been used as a BOOT_LOADER */
 140                 set_nlink(inode_bl, 1);
 141                 i_uid_write(inode_bl, 0);
 142                 i_gid_write(inode_bl, 0);
 143                 inode_bl->i_flags = 0;
 144                 ei_bl->i_flags = 0;
 145                 inode_bl->i_version = 1;
 146                 i_size_write(inode_bl, 0);
 147                 inode_bl->i_mode = S_IFREG;
 148                 if (ext4_has_feature_extents(sb)) {
 149                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 150                         ext4_ext_tree_init(handle, inode_bl);
 151                 } else
 152                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 153         }
 154
 155         swap_inode_data(inode, inode_bl);
 156
 157         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 158
 159         spin_lock(&sbi->s_next_gen_lock);
 160         inode->i_generation = sbi->s_next_generation++;
 161         inode_bl->i_generation = sbi->s_next_generation++;
 162         spin_unlock(&sbi->s_next_gen_lock);
 163
 164         ext4_discard_preallocations(inode);
 165
 166         err = ext4_mark_inode_dirty(handle, inode);
 167         if (err < 0) {
 168                 ext4_warning(inode->i_sb,
 169                         "couldn't mark inode #%lu dirty (err %d)",
 170                         inode->i_ino, err);
 171                 /* Revert all changes: */
 172                 swap_inode_data(inode, inode_bl);
 173         } else {
 174                 err = ext4_mark_inode_dirty(handle, inode_bl);
 175                 if (err < 0) {
 176                         ext4_warning(inode_bl->i_sb,
 177                                 "couldn't mark inode #%lu dirty (err %d)",
 178                                 inode_bl->i_ino, err);
 179                         /* Revert all changes: */
 180                         swap_inode_data(inode, inode_bl);
 181                         ext4_mark_inode_dirty(handle, inode);
 182                 }
 183         }
 184         ext4_journal_stop(handle);
 185         ext4_double_up_write_data_sem(inode, inode_bl);
 186
 187 journal_err_out:
 188         ext4_inode_resume_unlocked_dio(inode);
 189         ext4_inode_resume_unlocked_dio(inode_bl);
 190         unlock_two_nondirectories(inode, inode_bl);
 191         iput(inode_bl);
 192         return err;
 193 }
 194
 195 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 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 #endif
 206
 207 static int ext4_ioctl_setflags(struct inode *inode,
 208                                unsigned int flags)
 209 {
 210         struct ext4_inode_info *ei = EXT4_I(inode);
 211         handle_t *handle = NULL;
 212         int err = -EPERM, migrate = 0;
 213         struct ext4_iloc iloc;
 214         unsigned int oldflags, mask, i;
 215         unsigned int jflag;
 216
 217         /* Is it quota file? Do not allow user to mess with it */
 218         if (IS_NOQUOTA(inode))
 219                 goto flags_out;
 220
 221         oldflags = ei->i_flags;
 222
 223         /* The JOURNAL_DATA flag is modifiable only by root */
 224         jflag = flags & EXT4_JOURNAL_DATA_FL;
 225
 226         /*
 227          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 228          * the relevant capability.
 229          *
 230          * This test looks nicer. Thanks to Pauline Middelink
 231          */
 232         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 233                 if (!capable(CAP_LINUX_IMMUTABLE))
 234                         goto flags_out;
 235         }
 236
 237         /*
 238          * The JOURNAL_DATA flag can only be changed by
 239          * the relevant capability.
 240          */
 241         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 242                 if (!capable(CAP_SYS_RESOURCE))
 243                         goto flags_out;
 244         }
 245         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 246                 migrate = 1;
 247
 248         if (flags & EXT4_EOFBLOCKS_FL) {
 249                 /* we don't support adding EOFBLOCKS flag */
 250                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 251                         err = -EOPNOTSUPP;
 252                         goto flags_out;
 253                 }
 254         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 255                 err = ext4_truncate(inode);
 256                 if (err)
 257                         goto flags_out;
 258         }
 259
 260         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 261         if (IS_ERR(handle)) {
 262                 err = PTR_ERR(handle);
 263                 goto flags_out;
 264         }
 265         if (IS_SYNC(inode))
 266                 ext4_handle_sync(handle);
 267         err = ext4_reserve_inode_write(handle, inode, &iloc);
 268         if (err)
 269                 goto flags_err;
 270
 271         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 272                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 273                         continue;
 274                 /* These flags get special treatment later */
 275                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 276                         continue;
 277                 if (mask & flags)
 278                         ext4_set_inode_flag(inode, i);
 279                 else
 280                         ext4_clear_inode_flag(inode, i);
 281         }
 282
 283         ext4_set_inode_flags(inode);
 284         inode->i_ctime = current_time(inode);
 285
 286         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 287 flags_err:
 288         ext4_journal_stop(handle);
 289         if (err)
 290                 goto flags_out;
 291
 292         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 293                 err = ext4_change_inode_journal_flag(inode, jflag);
 294         if (err)
 295                 goto flags_out;
 296         if (migrate) {
 297                 if (flags & EXT4_EXTENTS_FL)
 298                         err = ext4_ext_migrate(inode);
 299                 else
 300                         err = ext4_ind_migrate(inode);
 301         }
 302
 303 flags_out:
 304         return err;
 305 }
 306
 307 #ifdef CONFIG_QUOTA
 308 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 309 {
 310         struct inode *inode = file_inode(filp);
 311         struct super_block *sb = inode->i_sb;
 312         struct ext4_inode_info *ei = EXT4_I(inode);
 313         int err, rc;
 314         handle_t *handle;
 315         kprojid_t kprojid;
 316         struct ext4_iloc iloc;
 317         struct ext4_inode *raw_inode;
 318         struct dquot *transfer_to[MAXQUOTAS] = { };
 319
 320         if (!ext4_has_feature_project(sb)) {
 321                 if (projid != EXT4_DEF_PROJID)
 322                         return -EOPNOTSUPP;
 323                 else
 324                         return 0;
 325         }
 326
 327         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 328                 return -EOPNOTSUPP;
 329
 330         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 331
 332         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 333                 return 0;
 334
 335         err = mnt_want_write_file(filp);
 336         if (err)
 337                 return err;
 338
 339         err = -EPERM;
 340         inode_lock(inode);
 341         /* Is it quota file? Do not allow user to mess with it */
 342         if (IS_NOQUOTA(inode))
 343                 goto out_unlock;
 344
 345         err = ext4_get_inode_loc(inode, &iloc);
 346         if (err)
 347                 goto out_unlock;
 348
 349         raw_inode = ext4_raw_inode(&iloc);
 350         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 351                 err = -EOVERFLOW;
 352                 brelse(iloc.bh);
 353                 goto out_unlock;
 354         }
 355         brelse(iloc.bh);
 356
 357         dquot_initialize(inode);
 358
 359         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 360                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 361                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 362         if (IS_ERR(handle)) {
 363                 err = PTR_ERR(handle);
 364                 goto out_unlock;
 365         }
 366
 367         err = ext4_reserve_inode_write(handle, inode, &iloc);
 368         if (err)
 369                 goto out_stop;
 370
 371         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 372         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 373                 err = __dquot_transfer(inode, transfer_to);
 374                 dqput(transfer_to[PRJQUOTA]);
 375                 if (err)
 376                         goto out_dirty;
 377         }
 378
 379         EXT4_I(inode)->i_projid = kprojid;
 380         inode->i_ctime = current_time(inode);
 381 out_dirty:
 382         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 383         if (!err)
 384                 err = rc;
 385 out_stop:
 386         ext4_journal_stop(handle);
 387 out_unlock:
 388         inode_unlock(inode);
 389         mnt_drop_write_file(filp);
 390         return err;
 391 }
 392 #else
 393 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 394 {
 395         if (projid != EXT4_DEF_PROJID)
 396                 return -EOPNOTSUPP;
 397         return 0;
 398 }
 399 #endif
 400
 401 /* Transfer internal flags to xflags */
 402 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 403 {
 404         __u32 xflags = 0;
 405
 406         if (iflags & EXT4_SYNC_FL)
 407                 xflags |= FS_XFLAG_SYNC;
 408         if (iflags & EXT4_IMMUTABLE_FL)
 409                 xflags |= FS_XFLAG_IMMUTABLE;
 410         if (iflags & EXT4_APPEND_FL)
 411                 xflags |= FS_XFLAG_APPEND;
 412         if (iflags & EXT4_NODUMP_FL)
 413                 xflags |= FS_XFLAG_NODUMP;
 414         if (iflags & EXT4_NOATIME_FL)
 415                 xflags |= FS_XFLAG_NOATIME;
 416         if (iflags & EXT4_PROJINHERIT_FL)
 417                 xflags |= FS_XFLAG_PROJINHERIT;
 418         return xflags;
 419 }
 420
 421 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 422                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 423                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 424
 425 /* Transfer xflags flags to internal */
 426 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 427 {
 428         unsigned long iflags = 0;
 429
 430         if (xflags & FS_XFLAG_SYNC)
 431                 iflags |= EXT4_SYNC_FL;
 432         if (xflags & FS_XFLAG_IMMUTABLE)
 433                 iflags |= EXT4_IMMUTABLE_FL;
 434         if (xflags & FS_XFLAG_APPEND)
 435                 iflags |= EXT4_APPEND_FL;
 436         if (xflags & FS_XFLAG_NODUMP)
 437                 iflags |= EXT4_NODUMP_FL;
 438         if (xflags & FS_XFLAG_NOATIME)
 439                 iflags |= EXT4_NOATIME_FL;
 440         if (xflags & FS_XFLAG_PROJINHERIT)
 441                 iflags |= EXT4_PROJINHERIT_FL;
 442
 443         return iflags;
 444 }
 445
 446 int ext4_shutdown(struct super_block *sb, unsigned long arg)
 447 {
 448         struct ext4_sb_info *sbi = EXT4_SB(sb);
 449         __u32 flags;
 450
 451         if (!capable(CAP_SYS_ADMIN))
 452                 return -EPERM;
 453
 454         if (get_user(flags, (__u32 __user *)arg))
 455                 return -EFAULT;
 456
 457         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 458                 return -EINVAL;
 459
 460         if (ext4_forced_shutdown(sbi))
 461                 return 0;
 462
 463         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 464
 465         switch (flags) {
 466         case EXT4_GOING_FLAGS_DEFAULT:
 467                 freeze_bdev(sb->s_bdev);
 468                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 469                 thaw_bdev(sb->s_bdev, sb);
 470                 break;
 471         case EXT4_GOING_FLAGS_LOGFLUSH:
 472                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 473                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 474                         (void) ext4_force_commit(sb);
 475                         jbd2_journal_abort(sbi->s_journal, 0);
 476                 }
 477                 break;
 478         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 479                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 480                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 481                         msleep(100);
 482                         jbd2_journal_abort(sbi->s_journal, 0);
 483                 }
 484                 break;
 485         default:
 486                 return -EINVAL;
 487         }
 488         clear_opt(sb, DISCARD);
 489         return 0;
 490 }
 491
 492 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 493 {
 494         struct inode *inode = file_inode(filp);
 495         struct super_block *sb = inode->i_sb;
 496         struct ext4_inode_info *ei = EXT4_I(inode);
 497         unsigned int flags;
 498
 499         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 500
 501         switch (cmd) {
 502         case EXT4_IOC_GETFLAGS:
 503                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 504                 return put_user(flags, (int __user *) arg);
 505         case EXT4_IOC_SETFLAGS: {
 506                 int err;
 507
 508                 if (!inode_owner_or_capable(inode))
 509                         return -EACCES;
 510
 511                 if (get_user(flags, (int __user *) arg))
 512                         return -EFAULT;
 513
 514                 if (flags & ~EXT4_FL_USER_VISIBLE)
 515                         return -EOPNOTSUPP;
 516                 /*
 517                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 518                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 519                  * more restrictive than just silently masking off visible but
 520                  * not settable flags as we always did.
 521                  */
 522                 flags &= EXT4_FL_USER_MODIFIABLE;
 523                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 524                         return -EOPNOTSUPP;
 525
 526                 err = mnt_want_write_file(filp);
 527                 if (err)
 528                         return err;
 529
 530                 inode_lock(inode);
 531                 err = ext4_ioctl_setflags(inode, flags);
 532                 inode_unlock(inode);
 533                 mnt_drop_write_file(filp);
 534                 return err;
 535         }
 536         case EXT4_IOC_GETVERSION:
 537         case EXT4_IOC_GETVERSION_OLD:
 538                 return put_user(inode->i_generation, (int __user *) arg);
 539         case EXT4_IOC_SETVERSION:
 540         case EXT4_IOC_SETVERSION_OLD: {
 541                 handle_t *handle;
 542                 struct ext4_iloc iloc;
 543                 __u32 generation;
 544                 int err;
 545
 546                 if (!inode_owner_or_capable(inode))
 547                         return -EPERM;
 548
 549                 if (ext4_has_metadata_csum(inode->i_sb)) {
 550                         ext4_warning(sb, "Setting inode version is not "
 551                                      "supported with metadata_csum enabled.");
 552                         return -ENOTTY;
 553                 }
 554
 555                 err = mnt_want_write_file(filp);
 556                 if (err)
 557                         return err;
 558                 if (get_user(generation, (int __user *) arg)) {
 559                         err = -EFAULT;
 560                         goto setversion_out;
 561                 }
 562
 563                 inode_lock(inode);
 564                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 565                 if (IS_ERR(handle)) {
 566                         err = PTR_ERR(handle);
 567                         goto unlock_out;
 568                 }
 569                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 570                 if (err == 0) {
 571                         inode->i_ctime = current_time(inode);
 572                         inode->i_generation = generation;
 573                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 574                 }
 575                 ext4_journal_stop(handle);
 576
 577 unlock_out:
 578                 inode_unlock(inode);
 579 setversion_out:
 580                 mnt_drop_write_file(filp);
 581                 return err;
 582         }
 583         case EXT4_IOC_GROUP_EXTEND: {
 584                 ext4_fsblk_t n_blocks_count;
 585                 int err, err2=0;
 586
 587                 err = ext4_resize_begin(sb);
 588                 if (err)
 589                         return err;
 590
 591                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 592                         err = -EFAULT;
 593                         goto group_extend_out;
 594                 }
 595
 596                 if (ext4_has_feature_bigalloc(sb)) {
 597                         ext4_msg(sb, KERN_ERR,
 598                                  "Online resizing not supported with bigalloc");
 599                         err = -EOPNOTSUPP;
 600                         goto group_extend_out;
 601                 }
 602
 603                 err = mnt_want_write_file(filp);
 604                 if (err)
 605                         goto group_extend_out;
 606
 607                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 608                 if (EXT4_SB(sb)->s_journal) {
 609                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 610                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 611                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 612                 }
 613                 if (err == 0)
 614                         err = err2;
 615                 mnt_drop_write_file(filp);
 616 group_extend_out:
 617                 ext4_resize_end(sb);
 618                 return err;
 619         }
 620
 621         case EXT4_IOC_MOVE_EXT: {
 622                 struct move_extent me;
 623                 struct fd donor;
 624                 int err;
 625
 626                 if (!(filp->f_mode & FMODE_READ) ||
 627                     !(filp->f_mode & FMODE_WRITE))
 628                         return -EBADF;
 629
 630                 if (copy_from_user(&me,
 631                         (struct move_extent __user *)arg, sizeof(me)))
 632                         return -EFAULT;
 633                 me.moved_len = 0;
 634
 635                 donor = fdget(me.donor_fd);
 636                 if (!donor.file)
 637                         return -EBADF;
 638
 639                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 640                         err = -EBADF;
 641                         goto mext_out;
 642                 }
 643
 644                 if (ext4_has_feature_bigalloc(sb)) {
 645                         ext4_msg(sb, KERN_ERR,
 646                                  "Online defrag not supported with bigalloc");
 647                         err = -EOPNOTSUPP;
 648                         goto mext_out;
 649                 } else if (IS_DAX(inode)) {
 650                         ext4_msg(sb, KERN_ERR,
 651                                  "Online defrag not supported with DAX");
 652                         err = -EOPNOTSUPP;
 653                         goto mext_out;
 654                 }
 655
 656                 err = mnt_want_write_file(filp);
 657                 if (err)
 658                         goto mext_out;
 659
 660                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 661                                         me.donor_start, me.len, &me.moved_len);
 662                 mnt_drop_write_file(filp);
 663
 664                 if (copy_to_user((struct move_extent __user *)arg,
 665                                  &me, sizeof(me)))
 666                         err = -EFAULT;
 667 mext_out:
 668                 fdput(donor);
 669                 return err;
 670         }
 671
 672         case EXT4_IOC_GROUP_ADD: {
 673                 struct ext4_new_group_data input;
 674                 int err, err2=0;
 675
 676                 err = ext4_resize_begin(sb);
 677                 if (err)
 678                         return err;
 679
 680                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 681                                 sizeof(input))) {
 682                         err = -EFAULT;
 683                         goto group_add_out;
 684                 }
 685
 686                 if (ext4_has_feature_bigalloc(sb)) {
 687                         ext4_msg(sb, KERN_ERR,
 688                                  "Online resizing not supported with bigalloc");
 689                         err = -EOPNOTSUPP;
 690                         goto group_add_out;
 691                 }
 692
 693                 err = mnt_want_write_file(filp);
 694                 if (err)
 695                         goto group_add_out;
 696
 697                 err = ext4_group_add(sb, &input);
 698                 if (EXT4_SB(sb)->s_journal) {
 699                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 700                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 701                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 702                 }
 703                 if (err == 0)
 704                         err = err2;
 705                 mnt_drop_write_file(filp);
 706                 if (!err && ext4_has_group_desc_csum(sb) &&
 707                     test_opt(sb, INIT_INODE_TABLE))
 708                         err = ext4_register_li_request(sb, input.group);
 709 group_add_out:
 710                 ext4_resize_end(sb);
 711                 return err;
 712         }
 713
 714         case EXT4_IOC_MIGRATE:
 715         {
 716                 int err;
 717                 if (!inode_owner_or_capable(inode))
 718                         return -EACCES;
 719
 720                 err = mnt_want_write_file(filp);
 721                 if (err)
 722                         return err;
 723                 /*
 724                  * inode_mutex prevent write and truncate on the file.
 725                  * Read still goes through. We take i_data_sem in
 726                  * ext4_ext_swap_inode_data before we switch the
 727                  * inode format to prevent read.
 728                  */
 729                 inode_lock((inode));
 730                 err = ext4_ext_migrate(inode);
 731                 inode_unlock((inode));
 732                 mnt_drop_write_file(filp);
 733                 return err;
 734         }
 735
 736         case EXT4_IOC_ALLOC_DA_BLKS:
 737         {
 738                 int err;
 739                 if (!inode_owner_or_capable(inode))
 740                         return -EACCES;
 741
 742                 err = mnt_want_write_file(filp);
 743                 if (err)
 744                         return err;
 745                 err = ext4_alloc_da_blocks(inode);
 746                 mnt_drop_write_file(filp);
 747                 return err;
 748         }
 749
 750         case EXT4_IOC_SWAP_BOOT:
 751         {
 752                 int err;
 753                 if (!(filp->f_mode & FMODE_WRITE))
 754                         return -EBADF;
 755                 err = mnt_want_write_file(filp);
 756                 if (err)
 757                         return err;
 758                 err = swap_inode_boot_loader(sb, inode);
 759                 mnt_drop_write_file(filp);
 760                 return err;
 761         }
 762
 763         case EXT4_IOC_RESIZE_FS: {
 764                 ext4_fsblk_t n_blocks_count;
 765                 int err = 0, err2 = 0;
 766                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 767
 768                 if (ext4_has_feature_bigalloc(sb)) {
 769                         ext4_msg(sb, KERN_ERR,
 770                                  "Online resizing not (yet) supported with bigalloc");
 771                         return -EOPNOTSUPP;
 772                 }
 773
 774                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 775                                    sizeof(__u64))) {
 776                         return -EFAULT;
 777                 }
 778
 779                 err = ext4_resize_begin(sb);
 780                 if (err)
 781                         return err;
 782
 783                 err = mnt_want_write_file(filp);
 784                 if (err)
 785                         goto resizefs_out;
 786
 787                 err = ext4_resize_fs(sb, n_blocks_count);
 788                 if (EXT4_SB(sb)->s_journal) {
 789                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 790                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 791                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 792                 }
 793                 if (err == 0)
 794                         err = err2;
 795                 mnt_drop_write_file(filp);
 796                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 797                     ext4_has_group_desc_csum(sb) &&
 798                     test_opt(sb, INIT_INODE_TABLE))
 799                         err = ext4_register_li_request(sb, o_group);
 800
 801 resizefs_out:
 802                 ext4_resize_end(sb);
 803                 return err;
 804         }
 805
 806         case FITRIM:
 807         {
 808                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 809                 struct fstrim_range range;
 810                 int ret = 0;
 811
 812                 if (!capable(CAP_SYS_ADMIN))
 813                         return -EPERM;
 814
 815                 if (!blk_queue_discard(q))
 816                         return -EOPNOTSUPP;
 817
 818                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 819                     sizeof(range)))
 820                         return -EFAULT;
 821
 822                 range.minlen = max((unsigned int)range.minlen,
 823                                    q->limits.discard_granularity);
 824                 ret = ext4_trim_fs(sb, &range);
 825                 if (ret < 0)
 826                         return ret;
 827
 828                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 829                     sizeof(range)))
 830                         return -EFAULT;
 831
 832                 return 0;
 833         }
 834         case EXT4_IOC_PRECACHE_EXTENTS:
 835                 return ext4_ext_precache(inode);
 836
 837         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 838                 if (!ext4_has_feature_encrypt(sb))
 839                         return -EOPNOTSUPP;
 840                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 841
 842         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 843 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 844                 int err, err2;
 845                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 846                 handle_t *handle;
 847
 848                 if (!ext4_has_feature_encrypt(sb))
 849                         return -EOPNOTSUPP;
 850                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 851                         err = mnt_want_write_file(filp);
 852                         if (err)
 853                                 return err;
 854                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 855                         if (IS_ERR(handle)) {
 856                                 err = PTR_ERR(handle);
 857                                 goto pwsalt_err_exit;
 858                         }
 859                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 860                         if (err)
 861                                 goto pwsalt_err_journal;
 862                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 863                         err = ext4_handle_dirty_metadata(handle, NULL,
 864                                                          sbi->s_sbh);
 865                 pwsalt_err_journal:
 866                         err2 = ext4_journal_stop(handle);
 867                         if (err2 && !err)
 868                                 err = err2;
 869                 pwsalt_err_exit:
 870                         mnt_drop_write_file(filp);
 871                         if (err)
 872                                 return err;
 873                 }
 874                 if (copy_to_user((void __user *) arg,
 875                                  sbi->s_es->s_encrypt_pw_salt, 16))
 876                         return -EFAULT;
 877                 return 0;
 878 #else
 879                 return -EOPNOTSUPP;
 880 #endif
 881         }
 882         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 883                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 884
 885         case EXT4_IOC_FSGETXATTR:
 886         {
 887                 struct fsxattr fa;
 888
 889                 memset(&fa, 0, sizeof(struct fsxattr));
 890                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 891
 892                 if (ext4_has_feature_project(inode->i_sb)) {
 893                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 894                                 EXT4_I(inode)->i_projid);
 895                 }
 896
 897                 if (copy_to_user((struct fsxattr __user *)arg,
 898                                  &fa, sizeof(fa)))
 899                         return -EFAULT;
 900                 return 0;
 901         }
 902         case EXT4_IOC_FSSETXATTR:
 903         {
 904                 struct fsxattr fa;
 905                 int err;
 906
 907                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 908                                    sizeof(fa)))
 909                         return -EFAULT;
 910
 911                 /* Make sure caller has proper permission */
 912                 if (!inode_owner_or_capable(inode))
 913                         return -EACCES;
 914
 915                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
 916                         return -EOPNOTSUPP;
 917
 918                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
 919                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 920                         return -EOPNOTSUPP;
 921
 922                 err = mnt_want_write_file(filp);
 923                 if (err)
 924                         return err;
 925
 926                 inode_lock(inode);
 927                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
 928                          (flags & EXT4_FL_XFLAG_VISIBLE);
 929                 err = ext4_ioctl_setflags(inode, flags);
 930                 inode_unlock(inode);
 931                 mnt_drop_write_file(filp);
 932                 if (err)
 933                         return err;
 934
 935                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
 936                 if (err)
 937                         return err;
 938
 939                 return 0;
 940         }
 941         case EXT4_IOC_SHUTDOWN:
 942                 return ext4_shutdown(sb, arg);
 943         default:
 944                 return -ENOTTY;
 945         }
 946 }
 947
 948 #ifdef CONFIG_COMPAT
 949 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 950 {
 951         /* These are just misnamed, they actually get/put from/to user an int */
 952         switch (cmd) {
 953         case EXT4_IOC32_GETFLAGS:
 954                 cmd = EXT4_IOC_GETFLAGS;
 955                 break;
 956         case EXT4_IOC32_SETFLAGS:
 957                 cmd = EXT4_IOC_SETFLAGS;
 958                 break;
 959         case EXT4_IOC32_GETVERSION:
 960                 cmd = EXT4_IOC_GETVERSION;
 961                 break;
 962         case EXT4_IOC32_SETVERSION:
 963                 cmd = EXT4_IOC_SETVERSION;
 964                 break;
 965         case EXT4_IOC32_GROUP_EXTEND:
 966                 cmd = EXT4_IOC_GROUP_EXTEND;
 967                 break;
 968         case EXT4_IOC32_GETVERSION_OLD:
 969                 cmd = EXT4_IOC_GETVERSION_OLD;
 970                 break;
 971         case EXT4_IOC32_SETVERSION_OLD:
 972                 cmd = EXT4_IOC_SETVERSION_OLD;
 973                 break;
 974         case EXT4_IOC32_GETRSVSZ:
 975                 cmd = EXT4_IOC_GETRSVSZ;
 976                 break;
 977         case EXT4_IOC32_SETRSVSZ:
 978                 cmd = EXT4_IOC_SETRSVSZ;
 979                 break;
 980         case EXT4_IOC32_GROUP_ADD: {
 981                 struct compat_ext4_new_group_input __user *uinput;
 982                 struct ext4_new_group_input input;
 983                 mm_segment_t old_fs;
 984                 int err;
 985
 986                 uinput = compat_ptr(arg);
 987                 err = get_user(input.group, &uinput->group);
 988                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
 989                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
 990                 err |= get_user(input.inode_table, &uinput->inode_table);
 991                 err |= get_user(input.blocks_count, &uinput->blocks_count);
 992                 err |= get_user(input.reserved_blocks,
 993                                 &uinput->reserved_blocks);
 994                 if (err)
 995                         return -EFAULT;
 996                 old_fs = get_fs();
 997                 set_fs(KERNEL_DS);
 998                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
 999                                  (unsigned long) &input);
1000                 set_fs(old_fs);
1001                 return err;
1002         }
1003         case EXT4_IOC_MOVE_EXT:
1004         case EXT4_IOC_RESIZE_FS:
1005         case EXT4_IOC_PRECACHE_EXTENTS:
1006         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1007         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1008         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1009         case EXT4_IOC_SHUTDOWN:
1010                 break;
1011         default:
1012                 return -ENOIOCTLCMD;
1013         }
1014         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1015 }
1016 #endif