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 (!ns_capable(inode->i_sb->s_user_ns, 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(sb->s_user_ns, (projid_t)projid);
 332
 333         if (!projid_valid(kprojid))
 334                 return -EOVERFLOW;
 335         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 336                 return 0;
 337
 338         err = mnt_want_write_file(filp);
 339         if (err)
 340                 return err;
 341
 342         err = -EPERM;
 343         inode_lock(inode);
 344         /* Is it quota file? Do not allow user to mess with it */
 345         if (ext4_is_quota_file(inode))
 346                 goto out_unlock;
 347
 348         err = ext4_get_inode_loc(inode, &iloc);
 349         if (err)
 350                 goto out_unlock;
 351
 352         raw_inode = ext4_raw_inode(&iloc);
 353         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 354                 err = ext4_expand_extra_isize(inode,
 355                                               EXT4_SB(sb)->s_want_extra_isize,
 356                                               &iloc);
 357                 if (err)
 358                         goto out_unlock;
 359         } else {
 360                 brelse(iloc.bh);
 361         }
 362
 363         dquot_initialize(inode);
 364
 365         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 366                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 367                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 368         if (IS_ERR(handle)) {
 369                 err = PTR_ERR(handle);
 370                 goto out_unlock;
 371         }
 372
 373         err = ext4_reserve_inode_write(handle, inode, &iloc);
 374         if (err)
 375                 goto out_stop;
 376
 377         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 378         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 379
 380                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 381                  * counts xattr inode references.
 382                  */
 383                 down_read(&EXT4_I(inode)->xattr_sem);
 384                 err = __dquot_transfer(inode, transfer_to);
 385                 up_read(&EXT4_I(inode)->xattr_sem);
 386                 dqput(transfer_to[PRJQUOTA]);
 387                 if (err)
 388                         goto out_dirty;
 389         }
 390
 391         EXT4_I(inode)->i_projid = kprojid;
 392         inode->i_ctime = current_time(inode);
 393 out_dirty:
 394         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 395         if (!err)
 396                 err = rc;
 397 out_stop:
 398         ext4_journal_stop(handle);
 399 out_unlock:
 400         inode_unlock(inode);
 401         mnt_drop_write_file(filp);
 402         return err;
 403 }
 404 #else
 405 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 406 {
 407         if (projid != EXT4_DEF_PROJID)
 408                 return -EOPNOTSUPP;
 409         return 0;
 410 }
 411 #endif
 412
 413 /* Transfer internal flags to xflags */
 414 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 415 {
 416         __u32 xflags = 0;
 417
 418         if (iflags & EXT4_SYNC_FL)
 419                 xflags |= FS_XFLAG_SYNC;
 420         if (iflags & EXT4_IMMUTABLE_FL)
 421                 xflags |= FS_XFLAG_IMMUTABLE;
 422         if (iflags & EXT4_APPEND_FL)
 423                 xflags |= FS_XFLAG_APPEND;
 424         if (iflags & EXT4_NODUMP_FL)
 425                 xflags |= FS_XFLAG_NODUMP;
 426         if (iflags & EXT4_NOATIME_FL)
 427                 xflags |= FS_XFLAG_NOATIME;
 428         if (iflags & EXT4_PROJINHERIT_FL)
 429                 xflags |= FS_XFLAG_PROJINHERIT;
 430         return xflags;
 431 }
 432
 433 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 434                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 435                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 436
 437 /* Transfer xflags flags to internal */
 438 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 439 {
 440         unsigned long iflags = 0;
 441
 442         if (xflags & FS_XFLAG_SYNC)
 443                 iflags |= EXT4_SYNC_FL;
 444         if (xflags & FS_XFLAG_IMMUTABLE)
 445                 iflags |= EXT4_IMMUTABLE_FL;
 446         if (xflags & FS_XFLAG_APPEND)
 447                 iflags |= EXT4_APPEND_FL;
 448         if (xflags & FS_XFLAG_NODUMP)
 449                 iflags |= EXT4_NODUMP_FL;
 450         if (xflags & FS_XFLAG_NOATIME)
 451                 iflags |= EXT4_NOATIME_FL;
 452         if (xflags & FS_XFLAG_PROJINHERIT)
 453                 iflags |= EXT4_PROJINHERIT_FL;
 454
 455         return iflags;
 456 }
 457
 458 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 459 {
 460         struct ext4_sb_info *sbi = EXT4_SB(sb);
 461         __u32 flags;
 462
 463         if (!capable(CAP_SYS_ADMIN))
 464                 return -EPERM;
 465
 466         if (get_user(flags, (__u32 __user *)arg))
 467                 return -EFAULT;
 468
 469         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 470                 return -EINVAL;
 471
 472         if (ext4_forced_shutdown(sbi))
 473                 return 0;
 474
 475         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 476
 477         switch (flags) {
 478         case EXT4_GOING_FLAGS_DEFAULT:
 479                 freeze_bdev(sb->s_bdev);
 480                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 481                 thaw_bdev(sb->s_bdev, sb);
 482                 break;
 483         case EXT4_GOING_FLAGS_LOGFLUSH:
 484                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 485                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 486                         (void) ext4_force_commit(sb);
 487                         jbd2_journal_abort(sbi->s_journal, 0);
 488                 }
 489                 break;
 490         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 491                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 492                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 493                         msleep(100);
 494                         jbd2_journal_abort(sbi->s_journal, 0);
 495                 }
 496                 break;
 497         default:
 498                 return -EINVAL;
 499         }
 500         clear_opt(sb, DISCARD);
 501         return 0;
 502 }
 503
 504 struct getfsmap_info {
 505         struct super_block      *gi_sb;
 506         struct fsmap_head __user *gi_data;
 507         unsigned int            gi_idx;
 508         __u32                   gi_last_flags;
 509 };
 510
 511 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 512 {
 513         struct getfsmap_info *info = priv;
 514         struct fsmap fm;
 515
 516         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 517
 518         info->gi_last_flags = xfm->fmr_flags;
 519         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 520         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 521                         sizeof(struct fsmap)))
 522                 return -EFAULT;
 523
 524         return 0;
 525 }
 526
 527 static int ext4_ioc_getfsmap(struct super_block *sb,
 528                              struct fsmap_head __user *arg)
 529 {
 530         struct getfsmap_info info = {0};
 531         struct ext4_fsmap_head xhead = {0};
 532         struct fsmap_head head;
 533         bool aborted = false;
 534         int error;
 535
 536         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 537                 return -EFAULT;
 538         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 539             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 540                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 541             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 542                        sizeof(head.fmh_keys[1].fmr_reserved)))
 543                 return -EINVAL;
 544         /*
 545          * ext4 doesn't report file extents at all, so the only valid
 546          * file offsets are the magic ones (all zeroes or all ones).
 547          */
 548         if (head.fmh_keys[0].fmr_offset ||
 549             (head.fmh_keys[1].fmr_offset != 0 &&
 550              head.fmh_keys[1].fmr_offset != -1ULL))
 551                 return -EINVAL;
 552
 553         xhead.fmh_iflags = head.fmh_iflags;
 554         xhead.fmh_count = head.fmh_count;
 555         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 556         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 557
 558         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 559         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 560
 561         info.gi_sb = sb;
 562         info.gi_data = arg;
 563         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 564         if (error == EXT4_QUERY_RANGE_ABORT) {
 565                 error = 0;
 566                 aborted = true;
 567         } else if (error)
 568                 return error;
 569
 570         /* If we didn't abort, set the "last" flag in the last fmx */
 571         if (!aborted && info.gi_idx) {
 572                 info.gi_last_flags |= FMR_OF_LAST;
 573                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 574                                  &info.gi_last_flags,
 575                                  sizeof(info.gi_last_flags)))
 576                         return -EFAULT;
 577         }
 578
 579         /* copy back header */
 580         head.fmh_entries = xhead.fmh_entries;
 581         head.fmh_oflags = xhead.fmh_oflags;
 582         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 583                 return -EFAULT;
 584
 585         return 0;
 586 }
 587
 588 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 589 {
 590         struct inode *inode = file_inode(filp);
 591         struct super_block *sb = inode->i_sb;
 592         struct ext4_inode_info *ei = EXT4_I(inode);
 593         unsigned int flags;
 594
 595         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 596
 597         switch (cmd) {
 598         case FS_IOC_GETFSMAP:
 599                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 600         case EXT4_IOC_GETFLAGS:
 601                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 602                 return put_user(flags, (int __user *) arg);
 603         case EXT4_IOC_SETFLAGS: {
 604                 int err;
 605
 606                 if (!inode_owner_or_capable(inode))
 607                         return -EACCES;
 608
 609                 if (get_user(flags, (int __user *) arg))
 610                         return -EFAULT;
 611
 612                 if (flags & ~EXT4_FL_USER_VISIBLE)
 613                         return -EOPNOTSUPP;
 614                 /*
 615                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 616                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 617                  * more restrictive than just silently masking off visible but
 618                  * not settable flags as we always did.
 619                  */
 620                 flags &= EXT4_FL_USER_MODIFIABLE;
 621                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 622                         return -EOPNOTSUPP;
 623
 624                 err = mnt_want_write_file(filp);
 625                 if (err)
 626                         return err;
 627
 628                 inode_lock(inode);
 629                 err = ext4_ioctl_setflags(inode, flags);
 630                 inode_unlock(inode);
 631                 mnt_drop_write_file(filp);
 632                 return err;
 633         }
 634         case EXT4_IOC_GETVERSION:
 635         case EXT4_IOC_GETVERSION_OLD:
 636                 return put_user(inode->i_generation, (int __user *) arg);
 637         case EXT4_IOC_SETVERSION:
 638         case EXT4_IOC_SETVERSION_OLD: {
 639                 handle_t *handle;
 640                 struct ext4_iloc iloc;
 641                 __u32 generation;
 642                 int err;
 643
 644                 if (!inode_owner_or_capable(inode))
 645                         return -EPERM;
 646
 647                 if (ext4_has_metadata_csum(inode->i_sb)) {
 648                         ext4_warning(sb, "Setting inode version is not "
 649                                      "supported with metadata_csum enabled.");
 650                         return -ENOTTY;
 651                 }
 652
 653                 err = mnt_want_write_file(filp);
 654                 if (err)
 655                         return err;
 656                 if (get_user(generation, (int __user *) arg)) {
 657                         err = -EFAULT;
 658                         goto setversion_out;
 659                 }
 660
 661                 inode_lock(inode);
 662                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 663                 if (IS_ERR(handle)) {
 664                         err = PTR_ERR(handle);
 665                         goto unlock_out;
 666                 }
 667                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 668                 if (err == 0) {
 669                         inode->i_ctime = current_time(inode);
 670                         inode->i_generation = generation;
 671                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 672                 }
 673                 ext4_journal_stop(handle);
 674
 675 unlock_out:
 676                 inode_unlock(inode);
 677 setversion_out:
 678                 mnt_drop_write_file(filp);
 679                 return err;
 680         }
 681         case EXT4_IOC_GROUP_EXTEND: {
 682                 ext4_fsblk_t n_blocks_count;
 683                 int err, err2=0;
 684
 685                 err = ext4_resize_begin(sb);
 686                 if (err)
 687                         return err;
 688
 689                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 690                         err = -EFAULT;
 691                         goto group_extend_out;
 692                 }
 693
 694                 if (ext4_has_feature_bigalloc(sb)) {
 695                         ext4_msg(sb, KERN_ERR,
 696                                  "Online resizing not supported with bigalloc");
 697                         err = -EOPNOTSUPP;
 698                         goto group_extend_out;
 699                 }
 700
 701                 err = mnt_want_write_file(filp);
 702                 if (err)
 703                         goto group_extend_out;
 704
 705                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 706                 if (EXT4_SB(sb)->s_journal) {
 707                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 708                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 709                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 710                 }
 711                 if (err == 0)
 712                         err = err2;
 713                 mnt_drop_write_file(filp);
 714 group_extend_out:
 715                 ext4_resize_end(sb);
 716                 return err;
 717         }
 718
 719         case EXT4_IOC_MOVE_EXT: {
 720                 struct move_extent me;
 721                 struct fd donor;
 722                 int err;
 723
 724                 if (!(filp->f_mode & FMODE_READ) ||
 725                     !(filp->f_mode & FMODE_WRITE))
 726                         return -EBADF;
 727
 728                 if (copy_from_user(&me,
 729                         (struct move_extent __user *)arg, sizeof(me)))
 730                         return -EFAULT;
 731                 me.moved_len = 0;
 732
 733                 donor = fdget(me.donor_fd);
 734                 if (!donor.file)
 735                         return -EBADF;
 736
 737                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 738                         err = -EBADF;
 739                         goto mext_out;
 740                 }
 741
 742                 if (ext4_has_feature_bigalloc(sb)) {
 743                         ext4_msg(sb, KERN_ERR,
 744                                  "Online defrag not supported with bigalloc");
 745                         err = -EOPNOTSUPP;
 746                         goto mext_out;
 747                 } else if (IS_DAX(inode)) {
 748                         ext4_msg(sb, KERN_ERR,
 749                                  "Online defrag not supported with DAX");
 750                         err = -EOPNOTSUPP;
 751                         goto mext_out;
 752                 }
 753
 754                 err = mnt_want_write_file(filp);
 755                 if (err)
 756                         goto mext_out;
 757
 758                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 759                                         me.donor_start, me.len, &me.moved_len);
 760                 mnt_drop_write_file(filp);
 761
 762                 if (copy_to_user((struct move_extent __user *)arg,
 763                                  &me, sizeof(me)))
 764                         err = -EFAULT;
 765 mext_out:
 766                 fdput(donor);
 767                 return err;
 768         }
 769
 770         case EXT4_IOC_GROUP_ADD: {
 771                 struct ext4_new_group_data input;
 772                 int err, err2=0;
 773
 774                 err = ext4_resize_begin(sb);
 775                 if (err)
 776                         return err;
 777
 778                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 779                                 sizeof(input))) {
 780                         err = -EFAULT;
 781                         goto group_add_out;
 782                 }
 783
 784                 if (ext4_has_feature_bigalloc(sb)) {
 785                         ext4_msg(sb, KERN_ERR,
 786                                  "Online resizing not supported with bigalloc");
 787                         err = -EOPNOTSUPP;
 788                         goto group_add_out;
 789                 }
 790
 791                 err = mnt_want_write_file(filp);
 792                 if (err)
 793                         goto group_add_out;
 794
 795                 err = ext4_group_add(sb, &input);
 796                 if (EXT4_SB(sb)->s_journal) {
 797                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 798                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 799                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 800                 }
 801                 if (err == 0)
 802                         err = err2;
 803                 mnt_drop_write_file(filp);
 804                 if (!err && ext4_has_group_desc_csum(sb) &&
 805                     test_opt(sb, INIT_INODE_TABLE))
 806                         err = ext4_register_li_request(sb, input.group);
 807 group_add_out:
 808                 ext4_resize_end(sb);
 809                 return err;
 810         }
 811
 812         case EXT4_IOC_MIGRATE:
 813         {
 814                 int err;
 815                 if (!inode_owner_or_capable(inode))
 816                         return -EACCES;
 817
 818                 err = mnt_want_write_file(filp);
 819                 if (err)
 820                         return err;
 821                 /*
 822                  * inode_mutex prevent write and truncate on the file.
 823                  * Read still goes through. We take i_data_sem in
 824                  * ext4_ext_swap_inode_data before we switch the
 825                  * inode format to prevent read.
 826                  */
 827                 inode_lock((inode));
 828                 err = ext4_ext_migrate(inode);
 829                 inode_unlock((inode));
 830                 mnt_drop_write_file(filp);
 831                 return err;
 832         }
 833
 834         case EXT4_IOC_ALLOC_DA_BLKS:
 835         {
 836                 int err;
 837                 if (!inode_owner_or_capable(inode))
 838                         return -EACCES;
 839
 840                 err = mnt_want_write_file(filp);
 841                 if (err)
 842                         return err;
 843                 err = ext4_alloc_da_blocks(inode);
 844                 mnt_drop_write_file(filp);
 845                 return err;
 846         }
 847
 848         case EXT4_IOC_SWAP_BOOT:
 849         {
 850                 int err;
 851                 if (!(filp->f_mode & FMODE_WRITE))
 852                         return -EBADF;
 853                 err = mnt_want_write_file(filp);
 854                 if (err)
 855                         return err;
 856                 err = swap_inode_boot_loader(sb, inode);
 857                 mnt_drop_write_file(filp);
 858                 return err;
 859         }
 860
 861         case EXT4_IOC_RESIZE_FS: {
 862                 ext4_fsblk_t n_blocks_count;
 863                 int err = 0, err2 = 0;
 864                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 865
 866                 if (ext4_has_feature_bigalloc(sb)) {
 867                         ext4_msg(sb, KERN_ERR,
 868                                  "Online resizing not (yet) supported with bigalloc");
 869                         return -EOPNOTSUPP;
 870                 }
 871
 872                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 873                                    sizeof(__u64))) {
 874                         return -EFAULT;
 875                 }
 876
 877                 err = ext4_resize_begin(sb);
 878                 if (err)
 879                         return err;
 880
 881                 err = mnt_want_write_file(filp);
 882                 if (err)
 883                         goto resizefs_out;
 884
 885                 err = ext4_resize_fs(sb, n_blocks_count);
 886                 if (EXT4_SB(sb)->s_journal) {
 887                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 888                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 889                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 890                 }
 891                 if (err == 0)
 892                         err = err2;
 893                 mnt_drop_write_file(filp);
 894                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 895                     ext4_has_group_desc_csum(sb) &&
 896                     test_opt(sb, INIT_INODE_TABLE))
 897                         err = ext4_register_li_request(sb, o_group);
 898
 899 resizefs_out:
 900                 ext4_resize_end(sb);
 901                 return err;
 902         }
 903
 904         case FITRIM:
 905         {
 906                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 907                 struct fstrim_range range;
 908                 int ret = 0;
 909
 910                 if (!ns_capable(sb->s_user_ns, CAP_SYS_ADMIN))
 911                         return -EPERM;
 912
 913                 if (!blk_queue_discard(q))
 914                         return -EOPNOTSUPP;
 915
 916                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 917                     sizeof(range)))
 918                         return -EFAULT;
 919
 920                 range.minlen = max((unsigned int)range.minlen,
 921                                    q->limits.discard_granularity);
 922                 ret = ext4_trim_fs(sb, &range);
 923                 if (ret < 0)
 924                         return ret;
 925
 926                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 927                     sizeof(range)))
 928                         return -EFAULT;
 929
 930                 return 0;
 931         }
 932         case EXT4_IOC_PRECACHE_EXTENTS:
 933                 return ext4_ext_precache(inode);
 934
 935         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 936                 if (!ext4_has_feature_encrypt(sb))
 937                         return -EOPNOTSUPP;
 938                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 939
 940         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 941 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 942                 int err, err2;
 943                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 944                 handle_t *handle;
 945
 946                 if (!ext4_has_feature_encrypt(sb))
 947                         return -EOPNOTSUPP;
 948                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 949                         err = mnt_want_write_file(filp);
 950                         if (err)
 951                                 return err;
 952                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 953                         if (IS_ERR(handle)) {
 954                                 err = PTR_ERR(handle);
 955                                 goto pwsalt_err_exit;
 956                         }
 957                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 958                         if (err)
 959                                 goto pwsalt_err_journal;
 960                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 961                         err = ext4_handle_dirty_metadata(handle, NULL,
 962                                                          sbi->s_sbh);
 963                 pwsalt_err_journal:
 964                         err2 = ext4_journal_stop(handle);
 965                         if (err2 && !err)
 966                                 err = err2;
 967                 pwsalt_err_exit:
 968                         mnt_drop_write_file(filp);
 969                         if (err)
 970                                 return err;
 971                 }
 972                 if (copy_to_user((void __user *) arg,
 973                                  sbi->s_es->s_encrypt_pw_salt, 16))
 974                         return -EFAULT;
 975                 return 0;
 976 #else
 977                 return -EOPNOTSUPP;
 978 #endif
 979         }
 980         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 981                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 982
 983         case EXT4_IOC_FSGETXATTR:
 984         {
 985                 struct fsxattr fa;
 986
 987                 memset(&fa, 0, sizeof(struct fsxattr));
 988                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 989
 990                 if (ext4_has_feature_project(inode->i_sb)) {
 991                         fa.fsx_projid = (__u32)from_kprojid_munged(sb->s_user_ns,
 992                                 EXT4_I(inode)->i_projid);
 993                 }
 994
 995                 if (copy_to_user((struct fsxattr __user *)arg,
 996                                  &fa, sizeof(fa)))
 997                         return -EFAULT;
 998                 return 0;
 999         }
1000         case EXT4_IOC_FSSETXATTR:
1001         {
1002                 struct fsxattr fa;
1003                 int err;
1004
1005                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1006                                    sizeof(fa)))
1007                         return -EFAULT;
1008
1009                 /* Make sure caller has proper permission */
1010                 if (!inode_owner_or_capable(inode))
1011                         return -EACCES;
1012
1013                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1014                         return -EOPNOTSUPP;
1015
1016                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1017                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1018                         return -EOPNOTSUPP;
1019
1020                 err = mnt_want_write_file(filp);
1021                 if (err)
1022                         return err;
1023
1024                 inode_lock(inode);
1025                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1026                          (flags & EXT4_FL_XFLAG_VISIBLE);
1027                 err = ext4_ioctl_setflags(inode, flags);
1028                 inode_unlock(inode);
1029                 mnt_drop_write_file(filp);
1030                 if (err)
1031                         return err;
1032
1033                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1034                 if (err)
1035                         return err;
1036
1037                 return 0;
1038         }
1039         case EXT4_IOC_SHUTDOWN:
1040                 return ext4_shutdown(sb, arg);
1041         default:
1042                 return -ENOTTY;
1043         }
1044 }
1045
1046 #ifdef CONFIG_COMPAT
1047 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1048 {
1049         /* These are just misnamed, they actually get/put from/to user an int */
1050         switch (cmd) {
1051         case EXT4_IOC32_GETFLAGS:
1052                 cmd = EXT4_IOC_GETFLAGS;
1053                 break;
1054         case EXT4_IOC32_SETFLAGS:
1055                 cmd = EXT4_IOC_SETFLAGS;
1056                 break;
1057         case EXT4_IOC32_GETVERSION:
1058                 cmd = EXT4_IOC_GETVERSION;
1059                 break;
1060         case EXT4_IOC32_SETVERSION:
1061                 cmd = EXT4_IOC_SETVERSION;
1062                 break;
1063         case EXT4_IOC32_GROUP_EXTEND:
1064                 cmd = EXT4_IOC_GROUP_EXTEND;
1065                 break;
1066         case EXT4_IOC32_GETVERSION_OLD:
1067                 cmd = EXT4_IOC_GETVERSION_OLD;
1068                 break;
1069         case EXT4_IOC32_SETVERSION_OLD:
1070                 cmd = EXT4_IOC_SETVERSION_OLD;
1071                 break;
1072         case EXT4_IOC32_GETRSVSZ:
1073                 cmd = EXT4_IOC_GETRSVSZ;
1074                 break;
1075         case EXT4_IOC32_SETRSVSZ:
1076                 cmd = EXT4_IOC_SETRSVSZ;
1077                 break;
1078         case EXT4_IOC32_GROUP_ADD: {
1079                 struct compat_ext4_new_group_input __user *uinput;
1080                 struct ext4_new_group_input input;
1081                 mm_segment_t old_fs;
1082                 int err;
1083
1084                 uinput = compat_ptr(arg);
1085                 err = get_user(input.group, &uinput->group);
1086                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1087                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1088                 err |= get_user(input.inode_table, &uinput->inode_table);
1089                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1090                 err |= get_user(input.reserved_blocks,
1091                                 &uinput->reserved_blocks);
1092                 if (err)
1093                         return -EFAULT;
1094                 old_fs = get_fs();
1095                 set_fs(KERNEL_DS);
1096                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
1097                                  (unsigned long) &input);
1098                 set_fs(old_fs);
1099                 return err;
1100         }
1101         case EXT4_IOC_MOVE_EXT:
1102         case EXT4_IOC_RESIZE_FS:
1103         case EXT4_IOC_PRECACHE_EXTENTS:
1104         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1105         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1106         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1107         case EXT4_IOC_SHUTDOWN:
1108         case FS_IOC_GETFSMAP:
1109                 break;
1110         default:
1111                 return -ENOIOCTLCMD;
1112         }
1113         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1114 }
1115 #endif