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         ext4_inode_block_unlocked_dio(inode);
 128         ext4_inode_block_unlocked_dio(inode_bl);
 129         inode_dio_wait(inode);
 130         inode_dio_wait(inode_bl);
 131
 132         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 133         if (IS_ERR(handle)) {
 134                 err = -EINVAL;
 135                 goto journal_err_out;
 136         }
 137
 138         /* Protect extent tree against block allocations via delalloc */
 139         ext4_double_down_write_data_sem(inode, inode_bl);
 140
 141         if (inode_bl->i_nlink == 0) {
 142                 /* this inode has never been used as a BOOT_LOADER */
 143                 set_nlink(inode_bl, 1);
 144                 i_uid_write(inode_bl, 0);
 145                 i_gid_write(inode_bl, 0);
 146                 inode_bl->i_flags = 0;
 147                 ei_bl->i_flags = 0;
 148                 inode_set_iversion(inode_bl, 1);
 149                 i_size_write(inode_bl, 0);
 150                 inode_bl->i_mode = S_IFREG;
 151                 if (ext4_has_feature_extents(sb)) {
 152                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 153                         ext4_ext_tree_init(handle, inode_bl);
 154                 } else
 155                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 156         }
 157
 158         swap_inode_data(inode, inode_bl);
 159
 160         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 161
 162         inode->i_generation = prandom_u32();
 163         inode_bl->i_generation = prandom_u32();
 164
 165         ext4_discard_preallocations(inode);
 166
 167         err = ext4_mark_inode_dirty(handle, inode);
 168         if (err < 0) {
 169                 ext4_warning(inode->i_sb,
 170                         "couldn't mark inode #%lu dirty (err %d)",
 171                         inode->i_ino, err);
 172                 /* Revert all changes: */
 173                 swap_inode_data(inode, inode_bl);
 174         } else {
 175                 err = ext4_mark_inode_dirty(handle, inode_bl);
 176                 if (err < 0) {
 177                         ext4_warning(inode_bl->i_sb,
 178                                 "couldn't mark inode #%lu dirty (err %d)",
 179                                 inode_bl->i_ino, err);
 180                         /* Revert all changes: */
 181                         swap_inode_data(inode, inode_bl);
 182                         ext4_mark_inode_dirty(handle, inode);
 183                 }
 184         }
 185         ext4_journal_stop(handle);
 186         ext4_double_up_write_data_sem(inode, inode_bl);
 187
 188 journal_err_out:
 189         ext4_inode_resume_unlocked_dio(inode);
 190         ext4_inode_resume_unlocked_dio(inode_bl);
 191         unlock_two_nondirectories(inode, inode_bl);
 192         iput(inode_bl);
 193         return err;
 194 }
 195
 196 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 197 static int uuid_is_zero(__u8 u[16])
 198 {
 199         int     i;
 200
 201         for (i = 0; i < 16; i++)
 202                 if (u[i])
 203                         return 0;
 204         return 1;
 205 }
 206 #endif
 207
 208 static int ext4_ioctl_setflags(struct inode *inode,
 209                                unsigned int flags)
 210 {
 211         struct ext4_inode_info *ei = EXT4_I(inode);
 212         handle_t *handle = NULL;
 213         int err = -EPERM, migrate = 0;
 214         struct ext4_iloc iloc;
 215         unsigned int oldflags, mask, i;
 216         unsigned int jflag;
 217
 218         /* Is it quota file? Do not allow user to mess with it */
 219         if (ext4_is_quota_file(inode))
 220                 goto flags_out;
 221
 222         oldflags = ei->i_flags;
 223
 224         /* The JOURNAL_DATA flag is modifiable only by root */
 225         jflag = flags & EXT4_JOURNAL_DATA_FL;
 226
 227         /*
 228          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 229          * the relevant capability.
 230          *
 231          * This test looks nicer. Thanks to Pauline Middelink
 232          */
 233         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 234                 if (!capable(CAP_LINUX_IMMUTABLE))
 235                         goto flags_out;
 236         }
 237
 238         /*
 239          * The JOURNAL_DATA flag can only be changed by
 240          * the relevant capability.
 241          */
 242         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 243                 if (!capable(CAP_SYS_RESOURCE))
 244                         goto flags_out;
 245         }
 246         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 247                 migrate = 1;
 248
 249         if (flags & EXT4_EOFBLOCKS_FL) {
 250                 /* we don't support adding EOFBLOCKS flag */
 251                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 252                         err = -EOPNOTSUPP;
 253                         goto flags_out;
 254                 }
 255         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 256                 err = ext4_truncate(inode);
 257                 if (err)
 258                         goto flags_out;
 259         }
 260
 261         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 262         if (IS_ERR(handle)) {
 263                 err = PTR_ERR(handle);
 264                 goto flags_out;
 265         }
 266         if (IS_SYNC(inode))
 267                 ext4_handle_sync(handle);
 268         err = ext4_reserve_inode_write(handle, inode, &iloc);
 269         if (err)
 270                 goto flags_err;
 271
 272         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 273                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 274                         continue;
 275                 /* These flags get special treatment later */
 276                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 277                         continue;
 278                 if (mask & flags)
 279                         ext4_set_inode_flag(inode, i);
 280                 else
 281                         ext4_clear_inode_flag(inode, i);
 282         }
 283
 284         ext4_set_inode_flags(inode);
 285         inode->i_ctime = current_time(inode);
 286
 287         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 288 flags_err:
 289         ext4_journal_stop(handle);
 290         if (err)
 291                 goto flags_out;
 292
 293         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 294                 /*
 295                  * Changes to the journaling mode can cause unsafe changes to
 296                  * S_DAX if we are using the DAX mount option.
 297                  */
 298                 if (test_opt(inode->i_sb, DAX)) {
 299                         err = -EBUSY;
 300                         goto flags_out;
 301                 }
 302
 303                 err = ext4_change_inode_journal_flag(inode, jflag);
 304                 if (err)
 305                         goto flags_out;
 306         }
 307         if (migrate) {
 308                 if (flags & EXT4_EXTENTS_FL)
 309                         err = ext4_ext_migrate(inode);
 310                 else
 311                         err = ext4_ind_migrate(inode);
 312         }
 313
 314 flags_out:
 315         return err;
 316 }
 317
 318 #ifdef CONFIG_QUOTA
 319 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 320 {
 321         struct inode *inode = file_inode(filp);
 322         struct super_block *sb = inode->i_sb;
 323         struct ext4_inode_info *ei = EXT4_I(inode);
 324         int err, rc;
 325         handle_t *handle;
 326         kprojid_t kprojid;
 327         struct ext4_iloc iloc;
 328         struct ext4_inode *raw_inode;
 329         struct dquot *transfer_to[MAXQUOTAS] = { };
 330
 331         if (!ext4_has_feature_project(sb)) {
 332                 if (projid != EXT4_DEF_PROJID)
 333                         return -EOPNOTSUPP;
 334                 else
 335                         return 0;
 336         }
 337
 338         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 339                 return -EOPNOTSUPP;
 340
 341         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 342
 343         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 344                 return 0;
 345
 346         err = mnt_want_write_file(filp);
 347         if (err)
 348                 return err;
 349
 350         err = -EPERM;
 351         inode_lock(inode);
 352         /* Is it quota file? Do not allow user to mess with it */
 353         if (ext4_is_quota_file(inode))
 354                 goto out_unlock;
 355
 356         err = ext4_get_inode_loc(inode, &iloc);
 357         if (err)
 358                 goto out_unlock;
 359
 360         raw_inode = ext4_raw_inode(&iloc);
 361         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 362                 err = ext4_expand_extra_isize(inode,
 363                                               EXT4_SB(sb)->s_want_extra_isize,
 364                                               &iloc);
 365                 if (err)
 366                         goto out_unlock;
 367         } else {
 368                 brelse(iloc.bh);
 369         }
 370
 371         dquot_initialize(inode);
 372
 373         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 374                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 375                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 376         if (IS_ERR(handle)) {
 377                 err = PTR_ERR(handle);
 378                 goto out_unlock;
 379         }
 380
 381         err = ext4_reserve_inode_write(handle, inode, &iloc);
 382         if (err)
 383                 goto out_stop;
 384
 385         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 386         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 387
 388                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 389                  * counts xattr inode references.
 390                  */
 391                 down_read(&EXT4_I(inode)->xattr_sem);
 392                 err = __dquot_transfer(inode, transfer_to);
 393                 up_read(&EXT4_I(inode)->xattr_sem);
 394                 dqput(transfer_to[PRJQUOTA]);
 395                 if (err)
 396                         goto out_dirty;
 397         }
 398
 399         EXT4_I(inode)->i_projid = kprojid;
 400         inode->i_ctime = current_time(inode);
 401 out_dirty:
 402         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 403         if (!err)
 404                 err = rc;
 405 out_stop:
 406         ext4_journal_stop(handle);
 407 out_unlock:
 408         inode_unlock(inode);
 409         mnt_drop_write_file(filp);
 410         return err;
 411 }
 412 #else
 413 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 414 {
 415         if (projid != EXT4_DEF_PROJID)
 416                 return -EOPNOTSUPP;
 417         return 0;
 418 }
 419 #endif
 420
 421 /* Transfer internal flags to xflags */
 422 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 423 {
 424         __u32 xflags = 0;
 425
 426         if (iflags & EXT4_SYNC_FL)
 427                 xflags |= FS_XFLAG_SYNC;
 428         if (iflags & EXT4_IMMUTABLE_FL)
 429                 xflags |= FS_XFLAG_IMMUTABLE;
 430         if (iflags & EXT4_APPEND_FL)
 431                 xflags |= FS_XFLAG_APPEND;
 432         if (iflags & EXT4_NODUMP_FL)
 433                 xflags |= FS_XFLAG_NODUMP;
 434         if (iflags & EXT4_NOATIME_FL)
 435                 xflags |= FS_XFLAG_NOATIME;
 436         if (iflags & EXT4_PROJINHERIT_FL)
 437                 xflags |= FS_XFLAG_PROJINHERIT;
 438         return xflags;
 439 }
 440
 441 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 442                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 443                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 444
 445 /* Transfer xflags flags to internal */
 446 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 447 {
 448         unsigned long iflags = 0;
 449
 450         if (xflags & FS_XFLAG_SYNC)
 451                 iflags |= EXT4_SYNC_FL;
 452         if (xflags & FS_XFLAG_IMMUTABLE)
 453                 iflags |= EXT4_IMMUTABLE_FL;
 454         if (xflags & FS_XFLAG_APPEND)
 455                 iflags |= EXT4_APPEND_FL;
 456         if (xflags & FS_XFLAG_NODUMP)
 457                 iflags |= EXT4_NODUMP_FL;
 458         if (xflags & FS_XFLAG_NOATIME)
 459                 iflags |= EXT4_NOATIME_FL;
 460         if (xflags & FS_XFLAG_PROJINHERIT)
 461                 iflags |= EXT4_PROJINHERIT_FL;
 462
 463         return iflags;
 464 }
 465
 466 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 467 {
 468         struct ext4_sb_info *sbi = EXT4_SB(sb);
 469         __u32 flags;
 470
 471         if (!capable(CAP_SYS_ADMIN))
 472                 return -EPERM;
 473
 474         if (get_user(flags, (__u32 __user *)arg))
 475                 return -EFAULT;
 476
 477         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 478                 return -EINVAL;
 479
 480         if (ext4_forced_shutdown(sbi))
 481                 return 0;
 482
 483         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 484
 485         switch (flags) {
 486         case EXT4_GOING_FLAGS_DEFAULT:
 487                 freeze_bdev(sb->s_bdev);
 488                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 489                 thaw_bdev(sb->s_bdev, sb);
 490                 break;
 491         case EXT4_GOING_FLAGS_LOGFLUSH:
 492                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 493                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 494                         (void) ext4_force_commit(sb);
 495                         jbd2_journal_abort(sbi->s_journal, 0);
 496                 }
 497                 break;
 498         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 499                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 500                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 501                         msleep(100);
 502                         jbd2_journal_abort(sbi->s_journal, 0);
 503                 }
 504                 break;
 505         default:
 506                 return -EINVAL;
 507         }
 508         clear_opt(sb, DISCARD);
 509         return 0;
 510 }
 511
 512 struct getfsmap_info {
 513         struct super_block      *gi_sb;
 514         struct fsmap_head __user *gi_data;
 515         unsigned int            gi_idx;
 516         __u32                   gi_last_flags;
 517 };
 518
 519 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 520 {
 521         struct getfsmap_info *info = priv;
 522         struct fsmap fm;
 523
 524         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 525
 526         info->gi_last_flags = xfm->fmr_flags;
 527         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 528         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 529                         sizeof(struct fsmap)))
 530                 return -EFAULT;
 531
 532         return 0;
 533 }
 534
 535 static int ext4_ioc_getfsmap(struct super_block *sb,
 536                              struct fsmap_head __user *arg)
 537 {
 538         struct getfsmap_info info = {0};
 539         struct ext4_fsmap_head xhead = {0};
 540         struct fsmap_head head;
 541         bool aborted = false;
 542         int error;
 543
 544         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 545                 return -EFAULT;
 546         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 547             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 548                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 549             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 550                        sizeof(head.fmh_keys[1].fmr_reserved)))
 551                 return -EINVAL;
 552         /*
 553          * ext4 doesn't report file extents at all, so the only valid
 554          * file offsets are the magic ones (all zeroes or all ones).
 555          */
 556         if (head.fmh_keys[0].fmr_offset ||
 557             (head.fmh_keys[1].fmr_offset != 0 &&
 558              head.fmh_keys[1].fmr_offset != -1ULL))
 559                 return -EINVAL;
 560
 561         xhead.fmh_iflags = head.fmh_iflags;
 562         xhead.fmh_count = head.fmh_count;
 563         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 564         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 565
 566         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 567         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 568
 569         info.gi_sb = sb;
 570         info.gi_data = arg;
 571         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 572         if (error == EXT4_QUERY_RANGE_ABORT) {
 573                 error = 0;
 574                 aborted = true;
 575         } else if (error)
 576                 return error;
 577
 578         /* If we didn't abort, set the "last" flag in the last fmx */
 579         if (!aborted && info.gi_idx) {
 580                 info.gi_last_flags |= FMR_OF_LAST;
 581                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 582                                  &info.gi_last_flags,
 583                                  sizeof(info.gi_last_flags)))
 584                         return -EFAULT;
 585         }
 586
 587         /* copy back header */
 588         head.fmh_entries = xhead.fmh_entries;
 589         head.fmh_oflags = xhead.fmh_oflags;
 590         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 591                 return -EFAULT;
 592
 593         return 0;
 594 }
 595
 596 static long ext4_ioctl_group_add(struct file *file,
 597                                  struct ext4_new_group_data *input)
 598 {
 599         struct super_block *sb = file_inode(file)->i_sb;
 600         int err, err2=0;
 601
 602         err = ext4_resize_begin(sb);
 603         if (err)
 604                 return err;
 605
 606         if (ext4_has_feature_bigalloc(sb)) {
 607                 ext4_msg(sb, KERN_ERR,
 608                          "Online resizing not supported with bigalloc");
 609                 err = -EOPNOTSUPP;
 610                 goto group_add_out;
 611         }
 612
 613         err = mnt_want_write_file(file);
 614         if (err)
 615                 goto group_add_out;
 616
 617         err = ext4_group_add(sb, input);
 618         if (EXT4_SB(sb)->s_journal) {
 619                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 620                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 621                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 622         }
 623         if (err == 0)
 624                 err = err2;
 625         mnt_drop_write_file(file);
 626         if (!err && ext4_has_group_desc_csum(sb) &&
 627             test_opt(sb, INIT_INODE_TABLE))
 628                 err = ext4_register_li_request(sb, input->group);
 629 group_add_out:
 630         ext4_resize_end(sb);
 631         return err;
 632 }
 633
 634 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 635 {
 636         struct inode *inode = file_inode(filp);
 637         struct super_block *sb = inode->i_sb;
 638         struct ext4_inode_info *ei = EXT4_I(inode);
 639         unsigned int flags;
 640
 641         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 642
 643         switch (cmd) {
 644         case FS_IOC_GETFSMAP:
 645                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 646         case EXT4_IOC_GETFLAGS:
 647                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 648                 return put_user(flags, (int __user *) arg);
 649         case EXT4_IOC_SETFLAGS: {
 650                 int err;
 651
 652                 if (!inode_owner_or_capable(inode))
 653                         return -EACCES;
 654
 655                 if (get_user(flags, (int __user *) arg))
 656                         return -EFAULT;
 657
 658                 if (flags & ~EXT4_FL_USER_VISIBLE)
 659                         return -EOPNOTSUPP;
 660                 /*
 661                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 662                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 663                  * more restrictive than just silently masking off visible but
 664                  * not settable flags as we always did.
 665                  */
 666                 flags &= EXT4_FL_USER_MODIFIABLE;
 667                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 668                         return -EOPNOTSUPP;
 669
 670                 err = mnt_want_write_file(filp);
 671                 if (err)
 672                         return err;
 673
 674                 inode_lock(inode);
 675                 err = ext4_ioctl_setflags(inode, flags);
 676                 inode_unlock(inode);
 677                 mnt_drop_write_file(filp);
 678                 return err;
 679         }
 680         case EXT4_IOC_GETVERSION:
 681         case EXT4_IOC_GETVERSION_OLD:
 682                 return put_user(inode->i_generation, (int __user *) arg);
 683         case EXT4_IOC_SETVERSION:
 684         case EXT4_IOC_SETVERSION_OLD: {
 685                 handle_t *handle;
 686                 struct ext4_iloc iloc;
 687                 __u32 generation;
 688                 int err;
 689
 690                 if (!inode_owner_or_capable(inode))
 691                         return -EPERM;
 692
 693                 if (ext4_has_metadata_csum(inode->i_sb)) {
 694                         ext4_warning(sb, "Setting inode version is not "
 695                                      "supported with metadata_csum enabled.");
 696                         return -ENOTTY;
 697                 }
 698
 699                 err = mnt_want_write_file(filp);
 700                 if (err)
 701                         return err;
 702                 if (get_user(generation, (int __user *) arg)) {
 703                         err = -EFAULT;
 704                         goto setversion_out;
 705                 }
 706
 707                 inode_lock(inode);
 708                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 709                 if (IS_ERR(handle)) {
 710                         err = PTR_ERR(handle);
 711                         goto unlock_out;
 712                 }
 713                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 714                 if (err == 0) {
 715                         inode->i_ctime = current_time(inode);
 716                         inode->i_generation = generation;
 717                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 718                 }
 719                 ext4_journal_stop(handle);
 720
 721 unlock_out:
 722                 inode_unlock(inode);
 723 setversion_out:
 724                 mnt_drop_write_file(filp);
 725                 return err;
 726         }
 727         case EXT4_IOC_GROUP_EXTEND: {
 728                 ext4_fsblk_t n_blocks_count;
 729                 int err, err2=0;
 730
 731                 err = ext4_resize_begin(sb);
 732                 if (err)
 733                         return err;
 734
 735                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 736                         err = -EFAULT;
 737                         goto group_extend_out;
 738                 }
 739
 740                 if (ext4_has_feature_bigalloc(sb)) {
 741                         ext4_msg(sb, KERN_ERR,
 742                                  "Online resizing not supported with bigalloc");
 743                         err = -EOPNOTSUPP;
 744                         goto group_extend_out;
 745                 }
 746
 747                 err = mnt_want_write_file(filp);
 748                 if (err)
 749                         goto group_extend_out;
 750
 751                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 752                 if (EXT4_SB(sb)->s_journal) {
 753                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 754                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 755                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 756                 }
 757                 if (err == 0)
 758                         err = err2;
 759                 mnt_drop_write_file(filp);
 760 group_extend_out:
 761                 ext4_resize_end(sb);
 762                 return err;
 763         }
 764
 765         case EXT4_IOC_MOVE_EXT: {
 766                 struct move_extent me;
 767                 struct fd donor;
 768                 int err;
 769
 770                 if (!(filp->f_mode & FMODE_READ) ||
 771                     !(filp->f_mode & FMODE_WRITE))
 772                         return -EBADF;
 773
 774                 if (copy_from_user(&me,
 775                         (struct move_extent __user *)arg, sizeof(me)))
 776                         return -EFAULT;
 777                 me.moved_len = 0;
 778
 779                 donor = fdget(me.donor_fd);
 780                 if (!donor.file)
 781                         return -EBADF;
 782
 783                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 784                         err = -EBADF;
 785                         goto mext_out;
 786                 }
 787
 788                 if (ext4_has_feature_bigalloc(sb)) {
 789                         ext4_msg(sb, KERN_ERR,
 790                                  "Online defrag not supported with bigalloc");
 791                         err = -EOPNOTSUPP;
 792                         goto mext_out;
 793                 } else if (IS_DAX(inode)) {
 794                         ext4_msg(sb, KERN_ERR,
 795                                  "Online defrag not supported with DAX");
 796                         err = -EOPNOTSUPP;
 797                         goto mext_out;
 798                 }
 799
 800                 err = mnt_want_write_file(filp);
 801                 if (err)
 802                         goto mext_out;
 803
 804                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 805                                         me.donor_start, me.len, &me.moved_len);
 806                 mnt_drop_write_file(filp);
 807
 808                 if (copy_to_user((struct move_extent __user *)arg,
 809                                  &me, sizeof(me)))
 810                         err = -EFAULT;
 811 mext_out:
 812                 fdput(donor);
 813                 return err;
 814         }
 815
 816         case EXT4_IOC_GROUP_ADD: {
 817                 struct ext4_new_group_data input;
 818
 819                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 820                                 sizeof(input)))
 821                         return -EFAULT;
 822
 823                 return ext4_ioctl_group_add(filp, &input);
 824         }
 825
 826         case EXT4_IOC_MIGRATE:
 827         {
 828                 int err;
 829                 if (!inode_owner_or_capable(inode))
 830                         return -EACCES;
 831
 832                 err = mnt_want_write_file(filp);
 833                 if (err)
 834                         return err;
 835                 /*
 836                  * inode_mutex prevent write and truncate on the file.
 837                  * Read still goes through. We take i_data_sem in
 838                  * ext4_ext_swap_inode_data before we switch the
 839                  * inode format to prevent read.
 840                  */
 841                 inode_lock((inode));
 842                 err = ext4_ext_migrate(inode);
 843                 inode_unlock((inode));
 844                 mnt_drop_write_file(filp);
 845                 return err;
 846         }
 847
 848         case EXT4_IOC_ALLOC_DA_BLKS:
 849         {
 850                 int err;
 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                 err = ext4_alloc_da_blocks(inode);
 858                 mnt_drop_write_file(filp);
 859                 return err;
 860         }
 861
 862         case EXT4_IOC_SWAP_BOOT:
 863         {
 864                 int err;
 865                 if (!(filp->f_mode & FMODE_WRITE))
 866                         return -EBADF;
 867                 err = mnt_want_write_file(filp);
 868                 if (err)
 869                         return err;
 870                 err = swap_inode_boot_loader(sb, inode);
 871                 mnt_drop_write_file(filp);
 872                 return err;
 873         }
 874
 875         case EXT4_IOC_RESIZE_FS: {
 876                 ext4_fsblk_t n_blocks_count;
 877                 int err = 0, err2 = 0;
 878                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 879
 880                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 881                                    sizeof(__u64))) {
 882                         return -EFAULT;
 883                 }
 884
 885                 err = ext4_resize_begin(sb);
 886                 if (err)
 887                         return err;
 888
 889                 err = mnt_want_write_file(filp);
 890                 if (err)
 891                         goto resizefs_out;
 892
 893                 err = ext4_resize_fs(sb, n_blocks_count);
 894                 if (EXT4_SB(sb)->s_journal) {
 895                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 896                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 897                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 898                 }
 899                 if (err == 0)
 900                         err = err2;
 901                 mnt_drop_write_file(filp);
 902                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 903                     ext4_has_group_desc_csum(sb) &&
 904                     test_opt(sb, INIT_INODE_TABLE))
 905                         err = ext4_register_li_request(sb, o_group);
 906
 907 resizefs_out:
 908                 ext4_resize_end(sb);
 909                 return err;
 910         }
 911
 912         case FITRIM:
 913         {
 914                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 915                 struct fstrim_range range;
 916                 int ret = 0;
 917
 918                 if (!capable(CAP_SYS_ADMIN))
 919                         return -EPERM;
 920
 921                 if (!blk_queue_discard(q))
 922                         return -EOPNOTSUPP;
 923
 924                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 925                     sizeof(range)))
 926                         return -EFAULT;
 927
 928                 range.minlen = max((unsigned int)range.minlen,
 929                                    q->limits.discard_granularity);
 930                 ret = ext4_trim_fs(sb, &range);
 931                 if (ret < 0)
 932                         return ret;
 933
 934                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 935                     sizeof(range)))
 936                         return -EFAULT;
 937
 938                 return 0;
 939         }
 940         case EXT4_IOC_PRECACHE_EXTENTS:
 941                 return ext4_ext_precache(inode);
 942
 943         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 944                 if (!ext4_has_feature_encrypt(sb))
 945                         return -EOPNOTSUPP;
 946                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 947
 948         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 949 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 950                 int err, err2;
 951                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 952                 handle_t *handle;
 953
 954                 if (!ext4_has_feature_encrypt(sb))
 955                         return -EOPNOTSUPP;
 956                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 957                         err = mnt_want_write_file(filp);
 958                         if (err)
 959                                 return err;
 960                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 961                         if (IS_ERR(handle)) {
 962                                 err = PTR_ERR(handle);
 963                                 goto pwsalt_err_exit;
 964                         }
 965                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 966                         if (err)
 967                                 goto pwsalt_err_journal;
 968                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 969                         err = ext4_handle_dirty_metadata(handle, NULL,
 970                                                          sbi->s_sbh);
 971                 pwsalt_err_journal:
 972                         err2 = ext4_journal_stop(handle);
 973                         if (err2 && !err)
 974                                 err = err2;
 975                 pwsalt_err_exit:
 976                         mnt_drop_write_file(filp);
 977                         if (err)
 978                                 return err;
 979                 }
 980                 if (copy_to_user((void __user *) arg,
 981                                  sbi->s_es->s_encrypt_pw_salt, 16))
 982                         return -EFAULT;
 983                 return 0;
 984 #else
 985                 return -EOPNOTSUPP;
 986 #endif
 987         }
 988         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 989                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 990
 991         case EXT4_IOC_FSGETXATTR:
 992         {
 993                 struct fsxattr fa;
 994
 995                 memset(&fa, 0, sizeof(struct fsxattr));
 996                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 997
 998                 if (ext4_has_feature_project(inode->i_sb)) {
 999                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1000                                 EXT4_I(inode)->i_projid);
1001                 }
1002
1003                 if (copy_to_user((struct fsxattr __user *)arg,
1004                                  &fa, sizeof(fa)))
1005                         return -EFAULT;
1006                 return 0;
1007         }
1008         case EXT4_IOC_FSSETXATTR:
1009         {
1010                 struct fsxattr fa;
1011                 int err;
1012
1013                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1014                                    sizeof(fa)))
1015                         return -EFAULT;
1016
1017                 /* Make sure caller has proper permission */
1018                 if (!inode_owner_or_capable(inode))
1019                         return -EACCES;
1020
1021                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1022                         return -EOPNOTSUPP;
1023
1024                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1025                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1026                         return -EOPNOTSUPP;
1027
1028                 err = mnt_want_write_file(filp);
1029                 if (err)
1030                         return err;
1031
1032                 inode_lock(inode);
1033                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1034                          (flags & EXT4_FL_XFLAG_VISIBLE);
1035                 err = ext4_ioctl_setflags(inode, flags);
1036                 inode_unlock(inode);
1037                 mnt_drop_write_file(filp);
1038                 if (err)
1039                         return err;
1040
1041                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1042                 if (err)
1043                         return err;
1044
1045                 return 0;
1046         }
1047         case EXT4_IOC_SHUTDOWN:
1048                 return ext4_shutdown(sb, arg);
1049         default:
1050                 return -ENOTTY;
1051         }
1052 }
1053
1054 #ifdef CONFIG_COMPAT
1055 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1056 {
1057         /* These are just misnamed, they actually get/put from/to user an int */
1058         switch (cmd) {
1059         case EXT4_IOC32_GETFLAGS:
1060                 cmd = EXT4_IOC_GETFLAGS;
1061                 break;
1062         case EXT4_IOC32_SETFLAGS:
1063                 cmd = EXT4_IOC_SETFLAGS;
1064                 break;
1065         case EXT4_IOC32_GETVERSION:
1066                 cmd = EXT4_IOC_GETVERSION;
1067                 break;
1068         case EXT4_IOC32_SETVERSION:
1069                 cmd = EXT4_IOC_SETVERSION;
1070                 break;
1071         case EXT4_IOC32_GROUP_EXTEND:
1072                 cmd = EXT4_IOC_GROUP_EXTEND;
1073                 break;
1074         case EXT4_IOC32_GETVERSION_OLD:
1075                 cmd = EXT4_IOC_GETVERSION_OLD;
1076                 break;
1077         case EXT4_IOC32_SETVERSION_OLD:
1078                 cmd = EXT4_IOC_SETVERSION_OLD;
1079                 break;
1080         case EXT4_IOC32_GETRSVSZ:
1081                 cmd = EXT4_IOC_GETRSVSZ;
1082                 break;
1083         case EXT4_IOC32_SETRSVSZ:
1084                 cmd = EXT4_IOC_SETRSVSZ;
1085                 break;
1086         case EXT4_IOC32_GROUP_ADD: {
1087                 struct compat_ext4_new_group_input __user *uinput;
1088                 struct ext4_new_group_data input;
1089                 int err;
1090
1091                 uinput = compat_ptr(arg);
1092                 err = get_user(input.group, &uinput->group);
1093                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1094                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1095                 err |= get_user(input.inode_table, &uinput->inode_table);
1096                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1097                 err |= get_user(input.reserved_blocks,
1098                                 &uinput->reserved_blocks);
1099                 if (err)
1100                         return -EFAULT;
1101                 return ext4_ioctl_group_add(file, &input);
1102         }
1103         case EXT4_IOC_MOVE_EXT:
1104         case EXT4_IOC_RESIZE_FS:
1105         case EXT4_IOC_PRECACHE_EXTENTS:
1106         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1107         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1108         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1109         case EXT4_IOC_SHUTDOWN:
1110         case FS_IOC_GETFSMAP:
1111                 break;
1112         default:
1113                 return -ENOIOCTLCMD;
1114         }
1115         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1116 }
1117 #endif