fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card ([email protected])
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/uuid.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/delay.h>
  22 #include <linux/iversion.h>
  23 #include "ext4_jbd2.h"
  24 #include "ext4.h"
  25 #include <linux/fsmap.h>
  26 #include "fsmap.h"
  27 #include <trace/events/ext4.h>
  28
  29 /**
  30  * Swap memory between @a and @b for @len bytes.
  31  *
  32  * @a:          pointer to first memory area
  33  * @b:          pointer to second memory area
  34  * @len:        number of bytes to swap
  35  *
  36  */
  37 static void memswap(void *a, void *b, size_t len)
  38 {
  39         unsigned char *ap, *bp;
  40
  41         ap = (unsigned char *)a;
  42         bp = (unsigned char *)b;
  43         while (len-- > 0) {
  44                 swap(*ap, *bp);
  45                 ap++;
  46                 bp++;
  47         }
  48 }
  49
  50 /**
  51  * Swap i_data and associated attributes between @inode1 and @inode2.
  52  * This function is used for the primary swap between inode1 and inode2
  53  * and also to revert this primary swap in case of errors.
  54  *
  55  * Therefore you have to make sure, that calling this method twice
  56  * will revert all changes.
  57  *
  58  * @inode1:     pointer to first inode
  59  * @inode2:     pointer to second inode
  60  */
  61 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  62 {
  63         loff_t isize;
  64         struct ext4_inode_info *ei1;
  65         struct ext4_inode_info *ei2;
  66
  67         ei1 = EXT4_I(inode1);
  68         ei2 = EXT4_I(inode2);
  69
  70         swap(inode1->i_flags, inode2->i_flags);
  71         swap(inode1->i_version, inode2->i_version);
  72         swap(inode1->i_blocks, inode2->i_blocks);
  73         swap(inode1->i_bytes, inode2->i_bytes);
  74         swap(inode1->i_atime, inode2->i_atime);
  75         swap(inode1->i_mtime, inode2->i_mtime);
  76
  77         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  78         swap(ei1->i_flags, ei2->i_flags);
  79         swap(ei1->i_disksize, ei2->i_disksize);
  80         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  81         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  82
  83         isize = i_size_read(inode1);
  84         i_size_write(inode1, i_size_read(inode2));
  85         i_size_write(inode2, isize);
  86 }
  87
  88 /**
  89  * Swap the information from the given @inode and the inode
  90  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  91  * important fields of the inodes.
  92  *
  93  * @sb:         the super block of the filesystem
  94  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  95  *
  96  */
  97 static long swap_inode_boot_loader(struct super_block *sb,
  98                                 struct inode *inode)
  99 {
 100         handle_t *handle;
 101         int err;
 102         struct inode *inode_bl;
 103         struct ext4_inode_info *ei_bl;
 104
 105         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 106                 return -EINVAL;
 107
 108         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 109                 return -EPERM;
 110
 111         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 112         if (IS_ERR(inode_bl))
 113                 return PTR_ERR(inode_bl);
 114         ei_bl = EXT4_I(inode_bl);
 115
 116         filemap_flush(inode->i_mapping);
 117         filemap_flush(inode_bl->i_mapping);
 118
 119         /* Protect orig inodes against a truncate and make sure,
 120          * that only 1 swap_inode_boot_loader is running. */
 121         lock_two_nondirectories(inode, inode_bl);
 122
 123         truncate_inode_pages(&inode->i_data, 0);
 124         truncate_inode_pages(&inode_bl->i_data, 0);
 125
 126         /* Wait for all existing dio workers */
 127         inode_dio_wait(inode);
 128         inode_dio_wait(inode_bl);
 129
 130         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 131         if (IS_ERR(handle)) {
 132                 err = -EINVAL;
 133                 goto journal_err_out;
 134         }
 135
 136         /* Protect extent tree against block allocations via delalloc */
 137         ext4_double_down_write_data_sem(inode, inode_bl);
 138
 139         if (inode_bl->i_nlink == 0) {
 140                 /* this inode has never been used as a BOOT_LOADER */
 141                 set_nlink(inode_bl, 1);
 142                 i_uid_write(inode_bl, 0);
 143                 i_gid_write(inode_bl, 0);
 144                 inode_bl->i_flags = 0;
 145                 ei_bl->i_flags = 0;
 146                 inode_set_iversion(inode_bl, 1);
 147                 i_size_write(inode_bl, 0);
 148                 inode_bl->i_mode = S_IFREG;
 149                 if (ext4_has_feature_extents(sb)) {
 150                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 151                         ext4_ext_tree_init(handle, inode_bl);
 152                 } else
 153                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 154         }
 155
 156         swap_inode_data(inode, inode_bl);
 157
 158         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 159
 160         inode->i_generation = prandom_u32();
 161         inode_bl->i_generation = prandom_u32();
 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         unlock_two_nondirectories(inode, inode_bl);
 188         iput(inode_bl);
 189         return err;
 190 }
 191
 192 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 193 static int uuid_is_zero(__u8 u[16])
 194 {
 195         int     i;
 196
 197         for (i = 0; i < 16; i++)
 198                 if (u[i])
 199                         return 0;
 200         return 1;
 201 }
 202 #endif
 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 (ext4_is_quota_file(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                 err = ext4_truncate(inode);
 253                 if (err)
 254                         goto flags_out;
 255         }
 256
 257         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 258         if (IS_ERR(handle)) {
 259                 err = PTR_ERR(handle);
 260                 goto flags_out;
 261         }
 262         if (IS_SYNC(inode))
 263                 ext4_handle_sync(handle);
 264         err = ext4_reserve_inode_write(handle, inode, &iloc);
 265         if (err)
 266                 goto flags_err;
 267
 268         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 269                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 270                         continue;
 271                 /* These flags get special treatment later */
 272                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 273                         continue;
 274                 if (mask & flags)
 275                         ext4_set_inode_flag(inode, i);
 276                 else
 277                         ext4_clear_inode_flag(inode, i);
 278         }
 279
 280         ext4_set_inode_flags(inode);
 281         inode->i_ctime = current_time(inode);
 282
 283         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 284 flags_err:
 285         ext4_journal_stop(handle);
 286         if (err)
 287                 goto flags_out;
 288
 289         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 290                 /*
 291                  * Changes to the journaling mode can cause unsafe changes to
 292                  * S_DAX if we are using the DAX mount option.
 293                  */
 294                 if (test_opt(inode->i_sb, DAX)) {
 295                         err = -EBUSY;
 296                         goto flags_out;
 297                 }
 298
 299                 err = ext4_change_inode_journal_flag(inode, jflag);
 300                 if (err)
 301                         goto flags_out;
 302         }
 303         if (migrate) {
 304                 if (flags & EXT4_EXTENTS_FL)
 305                         err = ext4_ext_migrate(inode);
 306                 else
 307                         err = ext4_ind_migrate(inode);
 308         }
 309
 310 flags_out:
 311         return err;
 312 }
 313
 314 #ifdef CONFIG_QUOTA
 315 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 316 {
 317         struct inode *inode = file_inode(filp);
 318         struct super_block *sb = inode->i_sb;
 319         struct ext4_inode_info *ei = EXT4_I(inode);
 320         int err, rc;
 321         handle_t *handle;
 322         kprojid_t kprojid;
 323         struct ext4_iloc iloc;
 324         struct ext4_inode *raw_inode;
 325         struct dquot *transfer_to[MAXQUOTAS] = { };
 326
 327         if (!ext4_has_feature_project(sb)) {
 328                 if (projid != EXT4_DEF_PROJID)
 329                         return -EOPNOTSUPP;
 330                 else
 331                         return 0;
 332         }
 333
 334         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 335                 return -EOPNOTSUPP;
 336
 337         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 338
 339         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 340                 return 0;
 341
 342         err = mnt_want_write_file(filp);
 343         if (err)
 344                 return err;
 345
 346         err = -EPERM;
 347         inode_lock(inode);
 348         /* Is it quota file? Do not allow user to mess with it */
 349         if (ext4_is_quota_file(inode))
 350                 goto out_unlock;
 351
 352         err = ext4_get_inode_loc(inode, &iloc);
 353         if (err)
 354                 goto out_unlock;
 355
 356         raw_inode = ext4_raw_inode(&iloc);
 357         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 358                 err = ext4_expand_extra_isize(inode,
 359                                               EXT4_SB(sb)->s_want_extra_isize,
 360                                               &iloc);
 361                 if (err)
 362                         goto out_unlock;
 363         } else {
 364                 brelse(iloc.bh);
 365         }
 366
 367         dquot_initialize(inode);
 368
 369         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 370                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 371                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 372         if (IS_ERR(handle)) {
 373                 err = PTR_ERR(handle);
 374                 goto out_unlock;
 375         }
 376
 377         err = ext4_reserve_inode_write(handle, inode, &iloc);
 378         if (err)
 379                 goto out_stop;
 380
 381         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 382         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 383
 384                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 385                  * counts xattr inode references.
 386                  */
 387                 down_read(&EXT4_I(inode)->xattr_sem);
 388                 err = __dquot_transfer(inode, transfer_to);
 389                 up_read(&EXT4_I(inode)->xattr_sem);
 390                 dqput(transfer_to[PRJQUOTA]);
 391                 if (err)
 392                         goto out_dirty;
 393         }
 394
 395         EXT4_I(inode)->i_projid = kprojid;
 396         inode->i_ctime = current_time(inode);
 397 out_dirty:
 398         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 399         if (!err)
 400                 err = rc;
 401 out_stop:
 402         ext4_journal_stop(handle);
 403 out_unlock:
 404         inode_unlock(inode);
 405         mnt_drop_write_file(filp);
 406         return err;
 407 }
 408 #else
 409 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 410 {
 411         if (projid != EXT4_DEF_PROJID)
 412                 return -EOPNOTSUPP;
 413         return 0;
 414 }
 415 #endif
 416
 417 /* Transfer internal flags to xflags */
 418 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 419 {
 420         __u32 xflags = 0;
 421
 422         if (iflags & EXT4_SYNC_FL)
 423                 xflags |= FS_XFLAG_SYNC;
 424         if (iflags & EXT4_IMMUTABLE_FL)
 425                 xflags |= FS_XFLAG_IMMUTABLE;
 426         if (iflags & EXT4_APPEND_FL)
 427                 xflags |= FS_XFLAG_APPEND;
 428         if (iflags & EXT4_NODUMP_FL)
 429                 xflags |= FS_XFLAG_NODUMP;
 430         if (iflags & EXT4_NOATIME_FL)
 431                 xflags |= FS_XFLAG_NOATIME;
 432         if (iflags & EXT4_PROJINHERIT_FL)
 433                 xflags |= FS_XFLAG_PROJINHERIT;
 434         return xflags;
 435 }
 436
 437 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 438                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 439                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 440
 441 /* Transfer xflags flags to internal */
 442 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 443 {
 444         unsigned long iflags = 0;
 445
 446         if (xflags & FS_XFLAG_SYNC)
 447                 iflags |= EXT4_SYNC_FL;
 448         if (xflags & FS_XFLAG_IMMUTABLE)
 449                 iflags |= EXT4_IMMUTABLE_FL;
 450         if (xflags & FS_XFLAG_APPEND)
 451                 iflags |= EXT4_APPEND_FL;
 452         if (xflags & FS_XFLAG_NODUMP)
 453                 iflags |= EXT4_NODUMP_FL;
 454         if (xflags & FS_XFLAG_NOATIME)
 455                 iflags |= EXT4_NOATIME_FL;
 456         if (xflags & FS_XFLAG_PROJINHERIT)
 457                 iflags |= EXT4_PROJINHERIT_FL;
 458
 459         return iflags;
 460 }
 461
 462 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 463 {
 464         struct ext4_sb_info *sbi = EXT4_SB(sb);
 465         __u32 flags;
 466
 467         if (!capable(CAP_SYS_ADMIN))
 468                 return -EPERM;
 469
 470         if (get_user(flags, (__u32 __user *)arg))
 471                 return -EFAULT;
 472
 473         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 474                 return -EINVAL;
 475
 476         if (ext4_forced_shutdown(sbi))
 477                 return 0;
 478
 479         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 480         trace_ext4_shutdown(sb, flags);
 481
 482         switch (flags) {
 483         case EXT4_GOING_FLAGS_DEFAULT:
 484                 freeze_bdev(sb->s_bdev);
 485                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 486                 thaw_bdev(sb->s_bdev, sb);
 487                 break;
 488         case EXT4_GOING_FLAGS_LOGFLUSH:
 489                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 490                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 491                         (void) ext4_force_commit(sb);
 492                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 493                 }
 494                 break;
 495         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 496                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 497                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 498                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 499                 break;
 500         default:
 501                 return -EINVAL;
 502         }
 503         clear_opt(sb, DISCARD);
 504         return 0;
 505 }
 506
 507 struct getfsmap_info {
 508         struct super_block      *gi_sb;
 509         struct fsmap_head __user *gi_data;
 510         unsigned int            gi_idx;
 511         __u32                   gi_last_flags;
 512 };
 513
 514 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 515 {
 516         struct getfsmap_info *info = priv;
 517         struct fsmap fm;
 518
 519         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 520
 521         info->gi_last_flags = xfm->fmr_flags;
 522         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 523         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 524                         sizeof(struct fsmap)))
 525                 return -EFAULT;
 526
 527         return 0;
 528 }
 529
 530 static int ext4_ioc_getfsmap(struct super_block *sb,
 531                              struct fsmap_head __user *arg)
 532 {
 533         struct getfsmap_info info = {0};
 534         struct ext4_fsmap_head xhead = {0};
 535         struct fsmap_head head;
 536         bool aborted = false;
 537         int error;
 538
 539         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 540                 return -EFAULT;
 541         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 542             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 543                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 544             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 545                        sizeof(head.fmh_keys[1].fmr_reserved)))
 546                 return -EINVAL;
 547         /*
 548          * ext4 doesn't report file extents at all, so the only valid
 549          * file offsets are the magic ones (all zeroes or all ones).
 550          */
 551         if (head.fmh_keys[0].fmr_offset ||
 552             (head.fmh_keys[1].fmr_offset != 0 &&
 553              head.fmh_keys[1].fmr_offset != -1ULL))
 554                 return -EINVAL;
 555
 556         xhead.fmh_iflags = head.fmh_iflags;
 557         xhead.fmh_count = head.fmh_count;
 558         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 559         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 560
 561         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 562         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 563
 564         info.gi_sb = sb;
 565         info.gi_data = arg;
 566         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 567         if (error == EXT4_QUERY_RANGE_ABORT) {
 568                 error = 0;
 569                 aborted = true;
 570         } else if (error)
 571                 return error;
 572
 573         /* If we didn't abort, set the "last" flag in the last fmx */
 574         if (!aborted && info.gi_idx) {
 575                 info.gi_last_flags |= FMR_OF_LAST;
 576                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 577                                  &info.gi_last_flags,
 578                                  sizeof(info.gi_last_flags)))
 579                         return -EFAULT;
 580         }
 581
 582         /* copy back header */
 583         head.fmh_entries = xhead.fmh_entries;
 584         head.fmh_oflags = xhead.fmh_oflags;
 585         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 586                 return -EFAULT;
 587
 588         return 0;
 589 }
 590
 591 static long ext4_ioctl_group_add(struct file *file,
 592                                  struct ext4_new_group_data *input)
 593 {
 594         struct super_block *sb = file_inode(file)->i_sb;
 595         int err, err2=0;
 596
 597         err = ext4_resize_begin(sb);
 598         if (err)
 599                 return err;
 600
 601         if (ext4_has_feature_bigalloc(sb)) {
 602                 ext4_msg(sb, KERN_ERR,
 603                          "Online resizing not supported with bigalloc");
 604                 err = -EOPNOTSUPP;
 605                 goto group_add_out;
 606         }
 607
 608         err = mnt_want_write_file(file);
 609         if (err)
 610                 goto group_add_out;
 611
 612         err = ext4_group_add(sb, input);
 613         if (EXT4_SB(sb)->s_journal) {
 614                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 615                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 616                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 617         }
 618         if (err == 0)
 619                 err = err2;
 620         mnt_drop_write_file(file);
 621         if (!err && ext4_has_group_desc_csum(sb) &&
 622             test_opt(sb, INIT_INODE_TABLE))
 623                 err = ext4_register_li_request(sb, input->group);
 624 group_add_out:
 625         ext4_resize_end(sb);
 626         return err;
 627 }
 628
 629 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 630 {
 631         struct inode *inode = file_inode(filp);
 632         struct super_block *sb = inode->i_sb;
 633         struct ext4_inode_info *ei = EXT4_I(inode);
 634         unsigned int flags;
 635
 636         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 637
 638         switch (cmd) {
 639         case FS_IOC_GETFSMAP:
 640                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 641         case EXT4_IOC_GETFLAGS:
 642                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 643                 return put_user(flags, (int __user *) arg);
 644         case EXT4_IOC_SETFLAGS: {
 645                 int err;
 646
 647                 if (!inode_owner_or_capable(inode))
 648                         return -EACCES;
 649
 650                 if (get_user(flags, (int __user *) arg))
 651                         return -EFAULT;
 652
 653                 if (flags & ~EXT4_FL_USER_VISIBLE)
 654                         return -EOPNOTSUPP;
 655                 /*
 656                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 657                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 658                  * more restrictive than just silently masking off visible but
 659                  * not settable flags as we always did.
 660                  */
 661                 flags &= EXT4_FL_USER_MODIFIABLE;
 662                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 663                         return -EOPNOTSUPP;
 664
 665                 err = mnt_want_write_file(filp);
 666                 if (err)
 667                         return err;
 668
 669                 inode_lock(inode);
 670                 err = ext4_ioctl_setflags(inode, flags);
 671                 inode_unlock(inode);
 672                 mnt_drop_write_file(filp);
 673                 return err;
 674         }
 675         case EXT4_IOC_GETVERSION:
 676         case EXT4_IOC_GETVERSION_OLD:
 677                 return put_user(inode->i_generation, (int __user *) arg);
 678         case EXT4_IOC_SETVERSION:
 679         case EXT4_IOC_SETVERSION_OLD: {
 680                 handle_t *handle;
 681                 struct ext4_iloc iloc;
 682                 __u32 generation;
 683                 int err;
 684
 685                 if (!inode_owner_or_capable(inode))
 686                         return -EPERM;
 687
 688                 if (ext4_has_metadata_csum(inode->i_sb)) {
 689                         ext4_warning(sb, "Setting inode version is not "
 690                                      "supported with metadata_csum enabled.");
 691                         return -ENOTTY;
 692                 }
 693
 694                 err = mnt_want_write_file(filp);
 695                 if (err)
 696                         return err;
 697                 if (get_user(generation, (int __user *) arg)) {
 698                         err = -EFAULT;
 699                         goto setversion_out;
 700                 }
 701
 702                 inode_lock(inode);
 703                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 704                 if (IS_ERR(handle)) {
 705                         err = PTR_ERR(handle);
 706                         goto unlock_out;
 707                 }
 708                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 709                 if (err == 0) {
 710                         inode->i_ctime = current_time(inode);
 711                         inode->i_generation = generation;
 712                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 713                 }
 714                 ext4_journal_stop(handle);
 715
 716 unlock_out:
 717                 inode_unlock(inode);
 718 setversion_out:
 719                 mnt_drop_write_file(filp);
 720                 return err;
 721         }
 722         case EXT4_IOC_GROUP_EXTEND: {
 723                 ext4_fsblk_t n_blocks_count;
 724                 int err, err2=0;
 725
 726                 err = ext4_resize_begin(sb);
 727                 if (err)
 728                         return err;
 729
 730                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 731                         err = -EFAULT;
 732                         goto group_extend_out;
 733                 }
 734
 735                 if (ext4_has_feature_bigalloc(sb)) {
 736                         ext4_msg(sb, KERN_ERR,
 737                                  "Online resizing not supported with bigalloc");
 738                         err = -EOPNOTSUPP;
 739                         goto group_extend_out;
 740                 }
 741
 742                 err = mnt_want_write_file(filp);
 743                 if (err)
 744                         goto group_extend_out;
 745
 746                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 747                 if (EXT4_SB(sb)->s_journal) {
 748                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 749                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 750                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 751                 }
 752                 if (err == 0)
 753                         err = err2;
 754                 mnt_drop_write_file(filp);
 755 group_extend_out:
 756                 ext4_resize_end(sb);
 757                 return err;
 758         }
 759
 760         case EXT4_IOC_MOVE_EXT: {
 761                 struct move_extent me;
 762                 struct fd donor;
 763                 int err;
 764
 765                 if (!(filp->f_mode & FMODE_READ) ||
 766                     !(filp->f_mode & FMODE_WRITE))
 767                         return -EBADF;
 768
 769                 if (copy_from_user(&me,
 770                         (struct move_extent __user *)arg, sizeof(me)))
 771                         return -EFAULT;
 772                 me.moved_len = 0;
 773
 774                 donor = fdget(me.donor_fd);
 775                 if (!donor.file)
 776                         return -EBADF;
 777
 778                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 779                         err = -EBADF;
 780                         goto mext_out;
 781                 }
 782
 783                 if (ext4_has_feature_bigalloc(sb)) {
 784                         ext4_msg(sb, KERN_ERR,
 785                                  "Online defrag not supported with bigalloc");
 786                         err = -EOPNOTSUPP;
 787                         goto mext_out;
 788                 } else if (IS_DAX(inode)) {
 789                         ext4_msg(sb, KERN_ERR,
 790                                  "Online defrag not supported with DAX");
 791                         err = -EOPNOTSUPP;
 792                         goto mext_out;
 793                 }
 794
 795                 err = mnt_want_write_file(filp);
 796                 if (err)
 797                         goto mext_out;
 798
 799                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 800                                         me.donor_start, me.len, &me.moved_len);
 801                 mnt_drop_write_file(filp);
 802
 803                 if (copy_to_user((struct move_extent __user *)arg,
 804                                  &me, sizeof(me)))
 805                         err = -EFAULT;
 806 mext_out:
 807                 fdput(donor);
 808                 return err;
 809         }
 810
 811         case EXT4_IOC_GROUP_ADD: {
 812                 struct ext4_new_group_data input;
 813
 814                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 815                                 sizeof(input)))
 816                         return -EFAULT;
 817
 818                 return ext4_ioctl_group_add(filp, &input);
 819         }
 820
 821         case EXT4_IOC_MIGRATE:
 822         {
 823                 int err;
 824                 if (!inode_owner_or_capable(inode))
 825                         return -EACCES;
 826
 827                 err = mnt_want_write_file(filp);
 828                 if (err)
 829                         return err;
 830                 /*
 831                  * inode_mutex prevent write and truncate on the file.
 832                  * Read still goes through. We take i_data_sem in
 833                  * ext4_ext_swap_inode_data before we switch the
 834                  * inode format to prevent read.
 835                  */
 836                 inode_lock((inode));
 837                 err = ext4_ext_migrate(inode);
 838                 inode_unlock((inode));
 839                 mnt_drop_write_file(filp);
 840                 return err;
 841         }
 842
 843         case EXT4_IOC_ALLOC_DA_BLKS:
 844         {
 845                 int err;
 846                 if (!inode_owner_or_capable(inode))
 847                         return -EACCES;
 848
 849                 err = mnt_want_write_file(filp);
 850                 if (err)
 851                         return err;
 852                 err = ext4_alloc_da_blocks(inode);
 853                 mnt_drop_write_file(filp);
 854                 return err;
 855         }
 856
 857         case EXT4_IOC_SWAP_BOOT:
 858         {
 859                 int err;
 860                 if (!(filp->f_mode & FMODE_WRITE))
 861                         return -EBADF;
 862                 err = mnt_want_write_file(filp);
 863                 if (err)
 864                         return err;
 865                 err = swap_inode_boot_loader(sb, inode);
 866                 mnt_drop_write_file(filp);
 867                 return err;
 868         }
 869
 870         case EXT4_IOC_RESIZE_FS: {
 871                 ext4_fsblk_t n_blocks_count;
 872                 int err = 0, err2 = 0;
 873                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 874
 875                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 876                                    sizeof(__u64))) {
 877                         return -EFAULT;
 878                 }
 879
 880                 err = ext4_resize_begin(sb);
 881                 if (err)
 882                         return err;
 883
 884                 err = mnt_want_write_file(filp);
 885                 if (err)
 886                         goto resizefs_out;
 887
 888                 err = ext4_resize_fs(sb, n_blocks_count);
 889                 if (EXT4_SB(sb)->s_journal) {
 890                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 891                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 892                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 893                 }
 894                 if (err == 0)
 895                         err = err2;
 896                 mnt_drop_write_file(filp);
 897                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 898                     ext4_has_group_desc_csum(sb) &&
 899                     test_opt(sb, INIT_INODE_TABLE))
 900                         err = ext4_register_li_request(sb, o_group);
 901
 902 resizefs_out:
 903                 ext4_resize_end(sb);
 904                 return err;
 905         }
 906
 907         case FITRIM:
 908         {
 909                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 910                 struct fstrim_range range;
 911                 int ret = 0;
 912
 913                 if (!capable(CAP_SYS_ADMIN))
 914                         return -EPERM;
 915
 916                 if (!blk_queue_discard(q))
 917                         return -EOPNOTSUPP;
 918
 919                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 920                     sizeof(range)))
 921                         return -EFAULT;
 922
 923                 range.minlen = max((unsigned int)range.minlen,
 924                                    q->limits.discard_granularity);
 925                 ret = ext4_trim_fs(sb, &range);
 926                 if (ret < 0)
 927                         return ret;
 928
 929                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 930                     sizeof(range)))
 931                         return -EFAULT;
 932
 933                 return 0;
 934         }
 935         case EXT4_IOC_PRECACHE_EXTENTS:
 936                 return ext4_ext_precache(inode);
 937
 938         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 939                 if (!ext4_has_feature_encrypt(sb))
 940                         return -EOPNOTSUPP;
 941                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 942
 943         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 944 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 945                 int err, err2;
 946                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 947                 handle_t *handle;
 948
 949                 if (!ext4_has_feature_encrypt(sb))
 950                         return -EOPNOTSUPP;
 951                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 952                         err = mnt_want_write_file(filp);
 953                         if (err)
 954                                 return err;
 955                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 956                         if (IS_ERR(handle)) {
 957                                 err = PTR_ERR(handle);
 958                                 goto pwsalt_err_exit;
 959                         }
 960                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 961                         if (err)
 962                                 goto pwsalt_err_journal;
 963                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 964                         err = ext4_handle_dirty_metadata(handle, NULL,
 965                                                          sbi->s_sbh);
 966                 pwsalt_err_journal:
 967                         err2 = ext4_journal_stop(handle);
 968                         if (err2 && !err)
 969                                 err = err2;
 970                 pwsalt_err_exit:
 971                         mnt_drop_write_file(filp);
 972                         if (err)
 973                                 return err;
 974                 }
 975                 if (copy_to_user((void __user *) arg,
 976                                  sbi->s_es->s_encrypt_pw_salt, 16))
 977                         return -EFAULT;
 978                 return 0;
 979 #else
 980                 return -EOPNOTSUPP;
 981 #endif
 982         }
 983         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 984                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 985
 986         case EXT4_IOC_FSGETXATTR:
 987         {
 988                 struct fsxattr fa;
 989
 990                 memset(&fa, 0, sizeof(struct fsxattr));
 991                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 992
 993                 if (ext4_has_feature_project(inode->i_sb)) {
 994                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 995                                 EXT4_I(inode)->i_projid);
 996                 }
 997
 998                 if (copy_to_user((struct fsxattr __user *)arg,
 999                                  &fa, sizeof(fa)))
1000                         return -EFAULT;
1001                 return 0;
1002         }
1003         case EXT4_IOC_FSSETXATTR:
1004         {
1005                 struct fsxattr fa;
1006                 int err;
1007
1008                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1009                                    sizeof(fa)))
1010                         return -EFAULT;
1011
1012                 /* Make sure caller has proper permission */
1013                 if (!inode_owner_or_capable(inode))
1014                         return -EACCES;
1015
1016                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1017                         return -EOPNOTSUPP;
1018
1019                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1020                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1021                         return -EOPNOTSUPP;
1022
1023                 err = mnt_want_write_file(filp);
1024                 if (err)
1025                         return err;
1026
1027                 inode_lock(inode);
1028                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1029                          (flags & EXT4_FL_XFLAG_VISIBLE);
1030                 err = ext4_ioctl_setflags(inode, flags);
1031                 inode_unlock(inode);
1032                 mnt_drop_write_file(filp);
1033                 if (err)
1034                         return err;
1035
1036                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1037                 if (err)
1038                         return err;
1039
1040                 return 0;
1041         }
1042         case EXT4_IOC_SHUTDOWN:
1043                 return ext4_shutdown(sb, arg);
1044         default:
1045                 return -ENOTTY;
1046         }
1047 }
1048
1049 #ifdef CONFIG_COMPAT
1050 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1051 {
1052         /* These are just misnamed, they actually get/put from/to user an int */
1053         switch (cmd) {
1054         case EXT4_IOC32_GETFLAGS:
1055                 cmd = EXT4_IOC_GETFLAGS;
1056                 break;
1057         case EXT4_IOC32_SETFLAGS:
1058                 cmd = EXT4_IOC_SETFLAGS;
1059                 break;
1060         case EXT4_IOC32_GETVERSION:
1061                 cmd = EXT4_IOC_GETVERSION;
1062                 break;
1063         case EXT4_IOC32_SETVERSION:
1064                 cmd = EXT4_IOC_SETVERSION;
1065                 break;
1066         case EXT4_IOC32_GROUP_EXTEND:
1067                 cmd = EXT4_IOC_GROUP_EXTEND;
1068                 break;
1069         case EXT4_IOC32_GETVERSION_OLD:
1070                 cmd = EXT4_IOC_GETVERSION_OLD;
1071                 break;
1072         case EXT4_IOC32_SETVERSION_OLD:
1073                 cmd = EXT4_IOC_SETVERSION_OLD;
1074                 break;
1075         case EXT4_IOC32_GETRSVSZ:
1076                 cmd = EXT4_IOC_GETRSVSZ;
1077                 break;
1078         case EXT4_IOC32_SETRSVSZ:
1079                 cmd = EXT4_IOC_SETRSVSZ;
1080                 break;
1081         case EXT4_IOC32_GROUP_ADD: {
1082                 struct compat_ext4_new_group_input __user *uinput;
1083                 struct ext4_new_group_data input;
1084                 int err;
1085
1086                 uinput = compat_ptr(arg);
1087                 err = get_user(input.group, &uinput->group);
1088                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1089                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1090                 err |= get_user(input.inode_table, &uinput->inode_table);
1091                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1092                 err |= get_user(input.reserved_blocks,
1093                                 &uinput->reserved_blocks);
1094                 if (err)
1095                         return -EFAULT;
1096                 return ext4_ioctl_group_add(file, &input);
1097         }
1098         case EXT4_IOC_MOVE_EXT:
1099         case EXT4_IOC_RESIZE_FS:
1100         case EXT4_IOC_PRECACHE_EXTENTS:
1101         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1102         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1103         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1104         case EXT4_IOC_SHUTDOWN:
1105         case FS_IOC_GETFSMAP:
1106                 break;
1107         default:
1108                 return -ENOIOCTLCMD;
1109         }
1110         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1111 }
1112 #endif