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 #include <linux/fsmap.h>
  23 #include "fsmap.h"
  24 #include <trace/events/ext4.h>
  25
  26 /**
  27  * Swap memory between @a and @b for @len bytes.
  28  *
  29  * @a:          pointer to first memory area
  30  * @b:          pointer to second memory area
  31  * @len:        number of bytes to swap
  32  *
  33  */
  34 static void memswap(void *a, void *b, size_t len)
  35 {
  36         unsigned char *ap, *bp;
  37
  38         ap = (unsigned char *)a;
  39         bp = (unsigned char *)b;
  40         while (len-- > 0) {
  41                 swap(*ap, *bp);
  42                 ap++;
  43                 bp++;
  44         }
  45 }
  46
  47 /**
  48  * Swap i_data and associated attributes between @inode1 and @inode2.
  49  * This function is used for the primary swap between inode1 and inode2
  50  * and also to revert this primary swap in case of errors.
  51  *
  52  * Therefore you have to make sure, that calling this method twice
  53  * will revert all changes.
  54  *
  55  * @inode1:     pointer to first inode
  56  * @inode2:     pointer to second inode
  57  */
  58 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  59 {
  60         loff_t isize;
  61         struct ext4_inode_info *ei1;
  62         struct ext4_inode_info *ei2;
  63
  64         ei1 = EXT4_I(inode1);
  65         ei2 = EXT4_I(inode2);
  66
  67         swap(inode1->i_flags, inode2->i_flags);
  68         swap(inode1->i_version, inode2->i_version);
  69         swap(inode1->i_blocks, inode2->i_blocks);
  70         swap(inode1->i_bytes, inode2->i_bytes);
  71         swap(inode1->i_atime, inode2->i_atime);
  72         swap(inode1->i_mtime, inode2->i_mtime);
  73
  74         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  75         swap(ei1->i_flags, ei2->i_flags);
  76         swap(ei1->i_disksize, ei2->i_disksize);
  77         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  78         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  79
  80         isize = i_size_read(inode1);
  81         i_size_write(inode1, i_size_read(inode2));
  82         i_size_write(inode2, isize);
  83 }
  84
  85 /**
  86  * Swap the information from the given @inode and the inode
  87  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  88  * important fields of the inodes.
  89  *
  90  * @sb:         the super block of the filesystem
  91  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  92  *
  93  */
  94 static long swap_inode_boot_loader(struct super_block *sb,
  95                                 struct inode *inode)
  96 {
  97         handle_t *handle;
  98         int err;
  99         struct inode *inode_bl;
 100         struct ext4_inode_info *ei_bl;
 101         struct ext4_sb_info *sbi = EXT4_SB(sb);
 102
 103         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 104                 return -EINVAL;
 105
 106         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 107                 return -EPERM;
 108
 109         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 110         if (IS_ERR(inode_bl))
 111                 return PTR_ERR(inode_bl);
 112         ei_bl = EXT4_I(inode_bl);
 113
 114         filemap_flush(inode->i_mapping);
 115         filemap_flush(inode_bl->i_mapping);
 116
 117         /* Protect orig inodes against a truncate and make sure,
 118          * that only 1 swap_inode_boot_loader is running. */
 119         lock_two_nondirectories(inode, inode_bl);
 120
 121         truncate_inode_pages(&inode->i_data, 0);
 122         truncate_inode_pages(&inode_bl->i_data, 0);
 123
 124         /* Wait for all existing dio workers */
 125         ext4_inode_block_unlocked_dio(inode);
 126         ext4_inode_block_unlocked_dio(inode_bl);
 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_bl->i_version = 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         spin_lock(&sbi->s_next_gen_lock);
 161         inode->i_generation = sbi->s_next_generation++;
 162         inode_bl->i_generation = sbi->s_next_generation++;
 163         spin_unlock(&sbi->s_next_gen_lock);
 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                 err = ext4_change_inode_journal_flag(inode, jflag);
 295         if (err)
 296                 goto flags_out;
 297         if (migrate) {
 298                 if (flags & EXT4_EXTENTS_FL)
 299                         err = ext4_ext_migrate(inode);
 300                 else
 301                         err = ext4_ind_migrate(inode);
 302         }
 303
 304 flags_out:
 305         return err;
 306 }
 307
 308 #ifdef CONFIG_QUOTA
 309 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 310 {
 311         struct inode *inode = file_inode(filp);
 312         struct super_block *sb = inode->i_sb;
 313         struct ext4_inode_info *ei = EXT4_I(inode);
 314         int err, rc;
 315         handle_t *handle;
 316         kprojid_t kprojid;
 317         struct ext4_iloc iloc;
 318         struct ext4_inode *raw_inode;
 319         struct dquot *transfer_to[MAXQUOTAS] = { };
 320
 321         if (!ext4_has_feature_project(sb)) {
 322                 if (projid != EXT4_DEF_PROJID)
 323                         return -EOPNOTSUPP;
 324                 else
 325                         return 0;
 326         }
 327
 328         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 329                 return -EOPNOTSUPP;
 330
 331         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 332
 333         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 334                 return 0;
 335
 336         err = mnt_want_write_file(filp);
 337         if (err)
 338                 return err;
 339
 340         err = -EPERM;
 341         inode_lock(inode);
 342         /* Is it quota file? Do not allow user to mess with it */
 343         if (ext4_is_quota_file(inode))
 344                 goto out_unlock;
 345
 346         err = ext4_get_inode_loc(inode, &iloc);
 347         if (err)
 348                 goto out_unlock;
 349
 350         raw_inode = ext4_raw_inode(&iloc);
 351         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 352                 err = ext4_expand_extra_isize(inode,
 353                                               EXT4_SB(sb)->s_want_extra_isize,
 354                                               &iloc);
 355                 if (err)
 356                         goto out_unlock;
 357         } else {
 358                 brelse(iloc.bh);
 359         }
 360
 361         dquot_initialize(inode);
 362
 363         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 364                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 365                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 366         if (IS_ERR(handle)) {
 367                 err = PTR_ERR(handle);
 368                 goto out_unlock;
 369         }
 370
 371         err = ext4_reserve_inode_write(handle, inode, &iloc);
 372         if (err)
 373                 goto out_stop;
 374
 375         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 376         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 377
 378                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 379                  * counts xattr inode references.
 380                  */
 381                 down_read(&EXT4_I(inode)->xattr_sem);
 382                 err = __dquot_transfer(inode, transfer_to);
 383                 up_read(&EXT4_I(inode)->xattr_sem);
 384                 dqput(transfer_to[PRJQUOTA]);
 385                 if (err)
 386                         goto out_dirty;
 387         }
 388
 389         EXT4_I(inode)->i_projid = kprojid;
 390         inode->i_ctime = current_time(inode);
 391 out_dirty:
 392         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 393         if (!err)
 394                 err = rc;
 395 out_stop:
 396         ext4_journal_stop(handle);
 397 out_unlock:
 398         inode_unlock(inode);
 399         mnt_drop_write_file(filp);
 400         return err;
 401 }
 402 #else
 403 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 404 {
 405         if (projid != EXT4_DEF_PROJID)
 406                 return -EOPNOTSUPP;
 407         return 0;
 408 }
 409 #endif
 410
 411 /* Transfer internal flags to xflags */
 412 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 413 {
 414         __u32 xflags = 0;
 415
 416         if (iflags & EXT4_SYNC_FL)
 417                 xflags |= FS_XFLAG_SYNC;
 418         if (iflags & EXT4_IMMUTABLE_FL)
 419                 xflags |= FS_XFLAG_IMMUTABLE;
 420         if (iflags & EXT4_APPEND_FL)
 421                 xflags |= FS_XFLAG_APPEND;
 422         if (iflags & EXT4_NODUMP_FL)
 423                 xflags |= FS_XFLAG_NODUMP;
 424         if (iflags & EXT4_NOATIME_FL)
 425                 xflags |= FS_XFLAG_NOATIME;
 426         if (iflags & EXT4_PROJINHERIT_FL)
 427                 xflags |= FS_XFLAG_PROJINHERIT;
 428         return xflags;
 429 }
 430
 431 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 432                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 433                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 434
 435 /* Transfer xflags flags to internal */
 436 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 437 {
 438         unsigned long iflags = 0;
 439
 440         if (xflags & FS_XFLAG_SYNC)
 441                 iflags |= EXT4_SYNC_FL;
 442         if (xflags & FS_XFLAG_IMMUTABLE)
 443                 iflags |= EXT4_IMMUTABLE_FL;
 444         if (xflags & FS_XFLAG_APPEND)
 445                 iflags |= EXT4_APPEND_FL;
 446         if (xflags & FS_XFLAG_NODUMP)
 447                 iflags |= EXT4_NODUMP_FL;
 448         if (xflags & FS_XFLAG_NOATIME)
 449                 iflags |= EXT4_NOATIME_FL;
 450         if (xflags & FS_XFLAG_PROJINHERIT)
 451                 iflags |= EXT4_PROJINHERIT_FL;
 452
 453         return iflags;
 454 }
 455
 456 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 457 {
 458         struct ext4_sb_info *sbi = EXT4_SB(sb);
 459         __u32 flags;
 460
 461         if (!capable(CAP_SYS_ADMIN))
 462                 return -EPERM;
 463
 464         if (get_user(flags, (__u32 __user *)arg))
 465                 return -EFAULT;
 466
 467         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 468                 return -EINVAL;
 469
 470         if (ext4_forced_shutdown(sbi))
 471                 return 0;
 472
 473         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 474
 475         switch (flags) {
 476         case EXT4_GOING_FLAGS_DEFAULT:
 477                 freeze_bdev(sb->s_bdev);
 478                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 479                 thaw_bdev(sb->s_bdev, sb);
 480                 break;
 481         case EXT4_GOING_FLAGS_LOGFLUSH:
 482                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 483                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 484                         (void) ext4_force_commit(sb);
 485                         jbd2_journal_abort(sbi->s_journal, 0);
 486                 }
 487                 break;
 488         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 489                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 490                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 491                         msleep(100);
 492                         jbd2_journal_abort(sbi->s_journal, 0);
 493                 }
 494                 break;
 495         default:
 496                 return -EINVAL;
 497         }
 498         clear_opt(sb, DISCARD);
 499         return 0;
 500 }
 501
 502 struct getfsmap_info {
 503         struct super_block      *gi_sb;
 504         struct fsmap_head __user *gi_data;
 505         unsigned int            gi_idx;
 506         __u32                   gi_last_flags;
 507 };
 508
 509 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 510 {
 511         struct getfsmap_info *info = priv;
 512         struct fsmap fm;
 513
 514         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 515
 516         info->gi_last_flags = xfm->fmr_flags;
 517         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 518         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 519                         sizeof(struct fsmap)))
 520                 return -EFAULT;
 521
 522         return 0;
 523 }
 524
 525 static int ext4_ioc_getfsmap(struct super_block *sb,
 526                              struct fsmap_head __user *arg)
 527 {
 528         struct getfsmap_info info = {0};
 529         struct ext4_fsmap_head xhead = {0};
 530         struct fsmap_head head;
 531         bool aborted = false;
 532         int error;
 533
 534         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 535                 return -EFAULT;
 536         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 537             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 538                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 539             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 540                        sizeof(head.fmh_keys[1].fmr_reserved)))
 541                 return -EINVAL;
 542         /*
 543          * ext4 doesn't report file extents at all, so the only valid
 544          * file offsets are the magic ones (all zeroes or all ones).
 545          */
 546         if (head.fmh_keys[0].fmr_offset ||
 547             (head.fmh_keys[1].fmr_offset != 0 &&
 548              head.fmh_keys[1].fmr_offset != -1ULL))
 549                 return -EINVAL;
 550
 551         xhead.fmh_iflags = head.fmh_iflags;
 552         xhead.fmh_count = head.fmh_count;
 553         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 554         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 555
 556         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 557         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 558
 559         info.gi_sb = sb;
 560         info.gi_data = arg;
 561         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 562         if (error == EXT4_QUERY_RANGE_ABORT) {
 563                 error = 0;
 564                 aborted = true;
 565         } else if (error)
 566                 return error;
 567
 568         /* If we didn't abort, set the "last" flag in the last fmx */
 569         if (!aborted && info.gi_idx) {
 570                 info.gi_last_flags |= FMR_OF_LAST;
 571                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 572                                  &info.gi_last_flags,
 573                                  sizeof(info.gi_last_flags)))
 574                         return -EFAULT;
 575         }
 576
 577         /* copy back header */
 578         head.fmh_entries = xhead.fmh_entries;
 579         head.fmh_oflags = xhead.fmh_oflags;
 580         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 581                 return -EFAULT;
 582
 583         return 0;
 584 }
 585
 586 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 587 {
 588         struct inode *inode = file_inode(filp);
 589         struct super_block *sb = inode->i_sb;
 590         struct ext4_inode_info *ei = EXT4_I(inode);
 591         unsigned int flags;
 592
 593         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 594
 595         switch (cmd) {
 596         case FS_IOC_GETFSMAP:
 597                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 598         case EXT4_IOC_GETFLAGS:
 599                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 600                 return put_user(flags, (int __user *) arg);
 601         case EXT4_IOC_SETFLAGS: {
 602                 int err;
 603
 604                 if (!inode_owner_or_capable(inode))
 605                         return -EACCES;
 606
 607                 if (get_user(flags, (int __user *) arg))
 608                         return -EFAULT;
 609
 610                 if (flags & ~EXT4_FL_USER_VISIBLE)
 611                         return -EOPNOTSUPP;
 612                 /*
 613                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 614                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 615                  * more restrictive than just silently masking off visible but
 616                  * not settable flags as we always did.
 617                  */
 618                 flags &= EXT4_FL_USER_MODIFIABLE;
 619                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 620                         return -EOPNOTSUPP;
 621
 622                 err = mnt_want_write_file(filp);
 623                 if (err)
 624                         return err;
 625
 626                 inode_lock(inode);
 627                 err = ext4_ioctl_setflags(inode, flags);
 628                 inode_unlock(inode);
 629                 mnt_drop_write_file(filp);
 630                 return err;
 631         }
 632         case EXT4_IOC_GETVERSION:
 633         case EXT4_IOC_GETVERSION_OLD:
 634                 return put_user(inode->i_generation, (int __user *) arg);
 635         case EXT4_IOC_SETVERSION:
 636         case EXT4_IOC_SETVERSION_OLD: {
 637                 handle_t *handle;
 638                 struct ext4_iloc iloc;
 639                 __u32 generation;
 640                 int err;
 641
 642                 if (!inode_owner_or_capable(inode))
 643                         return -EPERM;
 644
 645                 if (ext4_has_metadata_csum(inode->i_sb)) {
 646                         ext4_warning(sb, "Setting inode version is not "
 647                                      "supported with metadata_csum enabled.");
 648                         return -ENOTTY;
 649                 }
 650
 651                 err = mnt_want_write_file(filp);
 652                 if (err)
 653                         return err;
 654                 if (get_user(generation, (int __user *) arg)) {
 655                         err = -EFAULT;
 656                         goto setversion_out;
 657                 }
 658
 659                 inode_lock(inode);
 660                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 661                 if (IS_ERR(handle)) {
 662                         err = PTR_ERR(handle);
 663                         goto unlock_out;
 664                 }
 665                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 666                 if (err == 0) {
 667                         inode->i_ctime = current_time(inode);
 668                         inode->i_generation = generation;
 669                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 670                 }
 671                 ext4_journal_stop(handle);
 672
 673 unlock_out:
 674                 inode_unlock(inode);
 675 setversion_out:
 676                 mnt_drop_write_file(filp);
 677                 return err;
 678         }
 679         case EXT4_IOC_GROUP_EXTEND: {
 680                 ext4_fsblk_t n_blocks_count;
 681                 int err, err2=0;
 682
 683                 err = ext4_resize_begin(sb);
 684                 if (err)
 685                         return err;
 686
 687                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 688                         err = -EFAULT;
 689                         goto group_extend_out;
 690                 }
 691
 692                 if (ext4_has_feature_bigalloc(sb)) {
 693                         ext4_msg(sb, KERN_ERR,
 694                                  "Online resizing not supported with bigalloc");
 695                         err = -EOPNOTSUPP;
 696                         goto group_extend_out;
 697                 }
 698
 699                 err = mnt_want_write_file(filp);
 700                 if (err)
 701                         goto group_extend_out;
 702
 703                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 704                 if (EXT4_SB(sb)->s_journal) {
 705                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 706                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 707                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 708                 }
 709                 if (err == 0)
 710                         err = err2;
 711                 mnt_drop_write_file(filp);
 712 group_extend_out:
 713                 ext4_resize_end(sb);
 714                 return err;
 715         }
 716
 717         case EXT4_IOC_MOVE_EXT: {
 718                 struct move_extent me;
 719                 struct fd donor;
 720                 int err;
 721
 722                 if (!(filp->f_mode & FMODE_READ) ||
 723                     !(filp->f_mode & FMODE_WRITE))
 724                         return -EBADF;
 725
 726                 if (copy_from_user(&me,
 727                         (struct move_extent __user *)arg, sizeof(me)))
 728                         return -EFAULT;
 729                 me.moved_len = 0;
 730
 731                 donor = fdget(me.donor_fd);
 732                 if (!donor.file)
 733                         return -EBADF;
 734
 735                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 736                         err = -EBADF;
 737                         goto mext_out;
 738                 }
 739
 740                 if (ext4_has_feature_bigalloc(sb)) {
 741                         ext4_msg(sb, KERN_ERR,
 742                                  "Online defrag not supported with bigalloc");
 743                         err = -EOPNOTSUPP;
 744                         goto mext_out;
 745                 } else if (IS_DAX(inode)) {
 746                         ext4_msg(sb, KERN_ERR,
 747                                  "Online defrag not supported with DAX");
 748                         err = -EOPNOTSUPP;
 749                         goto mext_out;
 750                 }
 751
 752                 err = mnt_want_write_file(filp);
 753                 if (err)
 754                         goto mext_out;
 755
 756                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 757                                         me.donor_start, me.len, &me.moved_len);
 758                 mnt_drop_write_file(filp);
 759
 760                 if (copy_to_user((struct move_extent __user *)arg,
 761                                  &me, sizeof(me)))
 762                         err = -EFAULT;
 763 mext_out:
 764                 fdput(donor);
 765                 return err;
 766         }
 767
 768         case EXT4_IOC_GROUP_ADD: {
 769                 struct ext4_new_group_data input;
 770                 int err, err2=0;
 771
 772                 err = ext4_resize_begin(sb);
 773                 if (err)
 774                         return err;
 775
 776                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 777                                 sizeof(input))) {
 778                         err = -EFAULT;
 779                         goto group_add_out;
 780                 }
 781
 782                 if (ext4_has_feature_bigalloc(sb)) {
 783                         ext4_msg(sb, KERN_ERR,
 784                                  "Online resizing not supported with bigalloc");
 785                         err = -EOPNOTSUPP;
 786                         goto group_add_out;
 787                 }
 788
 789                 err = mnt_want_write_file(filp);
 790                 if (err)
 791                         goto group_add_out;
 792
 793                 err = ext4_group_add(sb, &input);
 794                 if (EXT4_SB(sb)->s_journal) {
 795                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 796                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 797                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 798                 }
 799                 if (err == 0)
 800                         err = err2;
 801                 mnt_drop_write_file(filp);
 802                 if (!err && ext4_has_group_desc_csum(sb) &&
 803                     test_opt(sb, INIT_INODE_TABLE))
 804                         err = ext4_register_li_request(sb, input.group);
 805 group_add_out:
 806                 ext4_resize_end(sb);
 807                 return err;
 808         }
 809
 810         case EXT4_IOC_MIGRATE:
 811         {
 812                 int err;
 813                 if (!inode_owner_or_capable(inode))
 814                         return -EACCES;
 815
 816                 err = mnt_want_write_file(filp);
 817                 if (err)
 818                         return err;
 819                 /*
 820                  * inode_mutex prevent write and truncate on the file.
 821                  * Read still goes through. We take i_data_sem in
 822                  * ext4_ext_swap_inode_data before we switch the
 823                  * inode format to prevent read.
 824                  */
 825                 inode_lock((inode));
 826                 err = ext4_ext_migrate(inode);
 827                 inode_unlock((inode));
 828                 mnt_drop_write_file(filp);
 829                 return err;
 830         }
 831
 832         case EXT4_IOC_ALLOC_DA_BLKS:
 833         {
 834                 int err;
 835                 if (!inode_owner_or_capable(inode))
 836                         return -EACCES;
 837
 838                 err = mnt_want_write_file(filp);
 839                 if (err)
 840                         return err;
 841                 err = ext4_alloc_da_blocks(inode);
 842                 mnt_drop_write_file(filp);
 843                 return err;
 844         }
 845
 846         case EXT4_IOC_SWAP_BOOT:
 847         {
 848                 int err;
 849                 if (!(filp->f_mode & FMODE_WRITE))
 850                         return -EBADF;
 851                 err = mnt_want_write_file(filp);
 852                 if (err)
 853                         return err;
 854                 err = swap_inode_boot_loader(sb, inode);
 855                 mnt_drop_write_file(filp);
 856                 return err;
 857         }
 858
 859         case EXT4_IOC_RESIZE_FS: {
 860                 ext4_fsblk_t n_blocks_count;
 861                 int err = 0, err2 = 0;
 862                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 863
 864                 if (ext4_has_feature_bigalloc(sb)) {
 865                         ext4_msg(sb, KERN_ERR,
 866                                  "Online resizing not (yet) supported with bigalloc");
 867                         return -EOPNOTSUPP;
 868                 }
 869
 870                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 871                                    sizeof(__u64))) {
 872                         return -EFAULT;
 873                 }
 874
 875                 err = ext4_resize_begin(sb);
 876                 if (err)
 877                         return err;
 878
 879                 err = mnt_want_write_file(filp);
 880                 if (err)
 881                         goto resizefs_out;
 882
 883                 err = ext4_resize_fs(sb, n_blocks_count);
 884                 if (EXT4_SB(sb)->s_journal) {
 885                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 886                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 887                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 888                 }
 889                 if (err == 0)
 890                         err = err2;
 891                 mnt_drop_write_file(filp);
 892                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 893                     ext4_has_group_desc_csum(sb) &&
 894                     test_opt(sb, INIT_INODE_TABLE))
 895                         err = ext4_register_li_request(sb, o_group);
 896
 897 resizefs_out:
 898                 ext4_resize_end(sb);
 899                 return err;
 900         }
 901
 902         case FITRIM:
 903         {
 904                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 905                 struct fstrim_range range;
 906                 int ret = 0;
 907
 908                 if (!capable(CAP_SYS_ADMIN))
 909                         return -EPERM;
 910
 911                 if (!blk_queue_discard(q))
 912                         return -EOPNOTSUPP;
 913
 914                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 915                     sizeof(range)))
 916                         return -EFAULT;
 917
 918                 range.minlen = max((unsigned int)range.minlen,
 919                                    q->limits.discard_granularity);
 920                 ret = ext4_trim_fs(sb, &range);
 921                 if (ret < 0)
 922                         return ret;
 923
 924                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 925                     sizeof(range)))
 926                         return -EFAULT;
 927
 928                 return 0;
 929         }
 930         case EXT4_IOC_PRECACHE_EXTENTS:
 931                 return ext4_ext_precache(inode);
 932
 933         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 934                 if (!ext4_has_feature_encrypt(sb))
 935                         return -EOPNOTSUPP;
 936                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 937
 938         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 939 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 940                 int err, err2;
 941                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 942                 handle_t *handle;
 943
 944                 if (!ext4_has_feature_encrypt(sb))
 945                         return -EOPNOTSUPP;
 946                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 947                         err = mnt_want_write_file(filp);
 948                         if (err)
 949                                 return err;
 950                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 951                         if (IS_ERR(handle)) {
 952                                 err = PTR_ERR(handle);
 953                                 goto pwsalt_err_exit;
 954                         }
 955                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 956                         if (err)
 957                                 goto pwsalt_err_journal;
 958                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 959                         err = ext4_handle_dirty_metadata(handle, NULL,
 960                                                          sbi->s_sbh);
 961                 pwsalt_err_journal:
 962                         err2 = ext4_journal_stop(handle);
 963                         if (err2 && !err)
 964                                 err = err2;
 965                 pwsalt_err_exit:
 966                         mnt_drop_write_file(filp);
 967                         if (err)
 968                                 return err;
 969                 }
 970                 if (copy_to_user((void __user *) arg,
 971                                  sbi->s_es->s_encrypt_pw_salt, 16))
 972                         return -EFAULT;
 973                 return 0;
 974 #else
 975                 return -EOPNOTSUPP;
 976 #endif
 977         }
 978         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 979                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 980
 981         case EXT4_IOC_FSGETXATTR:
 982         {
 983                 struct fsxattr fa;
 984
 985                 memset(&fa, 0, sizeof(struct fsxattr));
 986                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 987
 988                 if (ext4_has_feature_project(inode->i_sb)) {
 989                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 990                                 EXT4_I(inode)->i_projid);
 991                 }
 992
 993                 if (copy_to_user((struct fsxattr __user *)arg,
 994                                  &fa, sizeof(fa)))
 995                         return -EFAULT;
 996                 return 0;
 997         }
 998         case EXT4_IOC_FSSETXATTR:
 999         {
1000                 struct fsxattr fa;
1001                 int err;
1002
1003                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1004                                    sizeof(fa)))
1005                         return -EFAULT;
1006
1007                 /* Make sure caller has proper permission */
1008                 if (!inode_owner_or_capable(inode))
1009                         return -EACCES;
1010
1011                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1012                         return -EOPNOTSUPP;
1013
1014                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1015                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1016                         return -EOPNOTSUPP;
1017
1018                 err = mnt_want_write_file(filp);
1019                 if (err)
1020                         return err;
1021
1022                 inode_lock(inode);
1023                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1024                          (flags & EXT4_FL_XFLAG_VISIBLE);
1025                 err = ext4_ioctl_setflags(inode, flags);
1026                 inode_unlock(inode);
1027                 mnt_drop_write_file(filp);
1028                 if (err)
1029                         return err;
1030
1031                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1032                 if (err)
1033                         return err;
1034
1035                 return 0;
1036         }
1037         case EXT4_IOC_SHUTDOWN:
1038                 return ext4_shutdown(sb, arg);
1039         default:
1040                 return -ENOTTY;
1041         }
1042 }
1043
1044 #ifdef CONFIG_COMPAT
1045 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1046 {
1047         /* These are just misnamed, they actually get/put from/to user an int */
1048         switch (cmd) {
1049         case EXT4_IOC32_GETFLAGS:
1050                 cmd = EXT4_IOC_GETFLAGS;
1051                 break;
1052         case EXT4_IOC32_SETFLAGS:
1053                 cmd = EXT4_IOC_SETFLAGS;
1054                 break;
1055         case EXT4_IOC32_GETVERSION:
1056                 cmd = EXT4_IOC_GETVERSION;
1057                 break;
1058         case EXT4_IOC32_SETVERSION:
1059                 cmd = EXT4_IOC_SETVERSION;
1060                 break;
1061         case EXT4_IOC32_GROUP_EXTEND:
1062                 cmd = EXT4_IOC_GROUP_EXTEND;
1063                 break;
1064         case EXT4_IOC32_GETVERSION_OLD:
1065                 cmd = EXT4_IOC_GETVERSION_OLD;
1066                 break;
1067         case EXT4_IOC32_SETVERSION_OLD:
1068                 cmd = EXT4_IOC_SETVERSION_OLD;
1069                 break;
1070         case EXT4_IOC32_GETRSVSZ:
1071                 cmd = EXT4_IOC_GETRSVSZ;
1072                 break;
1073         case EXT4_IOC32_SETRSVSZ:
1074                 cmd = EXT4_IOC_SETRSVSZ;
1075                 break;
1076         case EXT4_IOC32_GROUP_ADD: {
1077                 struct compat_ext4_new_group_input __user *uinput;
1078                 struct ext4_new_group_input input;
1079                 mm_segment_t old_fs;
1080                 int err;
1081
1082                 uinput = compat_ptr(arg);
1083                 err = get_user(input.group, &uinput->group);
1084                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1085                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1086                 err |= get_user(input.inode_table, &uinput->inode_table);
1087                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1088                 err |= get_user(input.reserved_blocks,
1089                                 &uinput->reserved_blocks);
1090                 if (err)
1091                         return -EFAULT;
1092                 old_fs = get_fs();
1093                 set_fs(KERNEL_DS);
1094                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
1095                                  (unsigned long) &input);
1096                 set_fs(old_fs);
1097                 return err;
1098         }
1099         case EXT4_IOC_MOVE_EXT:
1100         case EXT4_IOC_RESIZE_FS:
1101         case EXT4_IOC_PRECACHE_EXTENTS:
1102         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1103         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1104         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1105         case EXT4_IOC_SHUTDOWN:
1106         case FS_IOC_GETFSMAP:
1107                 break;
1108         default:
1109                 return -ENOIOCTLCMD;
1110         }
1111         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1112 }
1113 #endif