fs/ext4/ioctl.c

   1 /*
   2  * linux/fs/ext4/ioctl.c
   3  *
   4  * Copyright (C) 1993, 1994, 1995
   5  * Remy Card ([email protected])
   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         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  68         memswap(&inode1->i_version, &inode2->i_version,
  69                   sizeof(inode1->i_version));
  70         memswap(&inode1->i_blocks, &inode2->i_blocks,
  71                   sizeof(inode1->i_blocks));
  72         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  73         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  74         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  75
  76         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  77         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  78         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  79         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  80         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  81
  82         isize = i_size_read(inode1);
  83         i_size_write(inode1, i_size_read(inode2));
  84         i_size_write(inode2, isize);
  85 }
  86
  87 /**
  88  * Swap the information from the given @inode and the inode
  89  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  90  * important fields of the inodes.
  91  *
  92  * @sb:         the super block of the filesystem
  93  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  94  *
  95  */
  96 static long swap_inode_boot_loader(struct super_block *sb,
  97                                 struct inode *inode)
  98 {
  99         handle_t *handle;
 100         int err;
 101         struct inode *inode_bl;
 102         struct ext4_inode_info *ei_bl;
 103         struct ext4_sb_info *sbi = EXT4_SB(sb);
 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_bl->i_version = 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         spin_lock(&sbi->s_next_gen_lock);
 163         inode->i_generation = sbi->s_next_generation++;
 164         inode_bl->i_generation = sbi->s_next_generation++;
 165         spin_unlock(&sbi->s_next_gen_lock);
 166
 167         ext4_discard_preallocations(inode);
 168
 169         err = ext4_mark_inode_dirty(handle, inode);
 170         if (err < 0) {
 171                 ext4_warning(inode->i_sb,
 172                         "couldn't mark inode #%lu dirty (err %d)",
 173                         inode->i_ino, err);
 174                 /* Revert all changes: */
 175                 swap_inode_data(inode, inode_bl);
 176         } else {
 177                 err = ext4_mark_inode_dirty(handle, inode_bl);
 178                 if (err < 0) {
 179                         ext4_warning(inode_bl->i_sb,
 180                                 "couldn't mark inode #%lu dirty (err %d)",
 181                                 inode_bl->i_ino, err);
 182                         /* Revert all changes: */
 183                         swap_inode_data(inode, inode_bl);
 184                         ext4_mark_inode_dirty(handle, inode);
 185                 }
 186         }
 187         ext4_journal_stop(handle);
 188         ext4_double_up_write_data_sem(inode, inode_bl);
 189
 190 journal_err_out:
 191         ext4_inode_resume_unlocked_dio(inode);
 192         ext4_inode_resume_unlocked_dio(inode_bl);
 193         unlock_two_nondirectories(inode, inode_bl);
 194         iput(inode_bl);
 195         return err;
 196 }
 197
 198 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 199 static int uuid_is_zero(__u8 u[16])
 200 {
 201         int     i;
 202
 203         for (i = 0; i < 16; i++)
 204                 if (u[i])
 205                         return 0;
 206         return 1;
 207 }
 208 #endif
 209
 210 static int ext4_ioctl_setflags(struct inode *inode,
 211                                unsigned int flags)
 212 {
 213         struct ext4_inode_info *ei = EXT4_I(inode);
 214         handle_t *handle = NULL;
 215         int err = -EPERM, migrate = 0;
 216         struct ext4_iloc iloc;
 217         unsigned int oldflags, mask, i;
 218         unsigned int jflag;
 219
 220         /* Is it quota file? Do not allow user to mess with it */
 221         if (ext4_is_quota_file(inode))
 222                 goto flags_out;
 223
 224         oldflags = ei->i_flags;
 225
 226         /* The JOURNAL_DATA flag is modifiable only by root */
 227         jflag = flags & EXT4_JOURNAL_DATA_FL;
 228
 229         /*
 230          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 231          * the relevant capability.
 232          *
 233          * This test looks nicer. Thanks to Pauline Middelink
 234          */
 235         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 236                 if (!capable(CAP_LINUX_IMMUTABLE))
 237                         goto flags_out;
 238         }
 239
 240         /*
 241          * The JOURNAL_DATA flag can only be changed by
 242          * the relevant capability.
 243          */
 244         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 245                 if (!capable(CAP_SYS_RESOURCE))
 246                         goto flags_out;
 247         }
 248         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 249                 migrate = 1;
 250
 251         if (flags & EXT4_EOFBLOCKS_FL) {
 252                 /* we don't support adding EOFBLOCKS flag */
 253                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 254                         err = -EOPNOTSUPP;
 255                         goto flags_out;
 256                 }
 257         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 258                 err = ext4_truncate(inode);
 259                 if (err)
 260                         goto flags_out;
 261         }
 262
 263         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 264         if (IS_ERR(handle)) {
 265                 err = PTR_ERR(handle);
 266                 goto flags_out;
 267         }
 268         if (IS_SYNC(inode))
 269                 ext4_handle_sync(handle);
 270         err = ext4_reserve_inode_write(handle, inode, &iloc);
 271         if (err)
 272                 goto flags_err;
 273
 274         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 275                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 276                         continue;
 277                 /* These flags get special treatment later */
 278                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 279                         continue;
 280                 if (mask & flags)
 281                         ext4_set_inode_flag(inode, i);
 282                 else
 283                         ext4_clear_inode_flag(inode, i);
 284         }
 285
 286         ext4_set_inode_flags(inode);
 287         inode->i_ctime = current_time(inode);
 288
 289         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 290 flags_err:
 291         ext4_journal_stop(handle);
 292         if (err)
 293                 goto flags_out;
 294
 295         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 296                 err = ext4_change_inode_journal_flag(inode, jflag);
 297         if (err)
 298                 goto flags_out;
 299         if (migrate) {
 300                 if (flags & EXT4_EXTENTS_FL)
 301                         err = ext4_ext_migrate(inode);
 302                 else
 303                         err = ext4_ind_migrate(inode);
 304         }
 305
 306 flags_out:
 307         return err;
 308 }
 309
 310 #ifdef CONFIG_QUOTA
 311 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 312 {
 313         struct inode *inode = file_inode(filp);
 314         struct super_block *sb = inode->i_sb;
 315         struct ext4_inode_info *ei = EXT4_I(inode);
 316         int err, rc;
 317         handle_t *handle;
 318         kprojid_t kprojid;
 319         struct ext4_iloc iloc;
 320         struct ext4_inode *raw_inode;
 321         struct dquot *transfer_to[MAXQUOTAS] = { };
 322
 323         if (!ext4_has_feature_project(sb)) {
 324                 if (projid != EXT4_DEF_PROJID)
 325                         return -EOPNOTSUPP;
 326                 else
 327                         return 0;
 328         }
 329
 330         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 331                 return -EOPNOTSUPP;
 332
 333         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 334
 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 = -EOVERFLOW;
 355                 brelse(iloc.bh);
 356                 goto out_unlock;
 357         }
 358         brelse(iloc.bh);
 359
 360         dquot_initialize(inode);
 361
 362         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 363                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 364                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 365         if (IS_ERR(handle)) {
 366                 err = PTR_ERR(handle);
 367                 goto out_unlock;
 368         }
 369
 370         err = ext4_reserve_inode_write(handle, inode, &iloc);
 371         if (err)
 372                 goto out_stop;
 373
 374         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 375         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 376
 377                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 378                  * counts xattr inode references.
 379                  */
 380                 down_read(&EXT4_I(inode)->xattr_sem);
 381                 err = __dquot_transfer(inode, transfer_to);
 382                 up_read(&EXT4_I(inode)->xattr_sem);
 383                 dqput(transfer_to[PRJQUOTA]);
 384                 if (err)
 385                         goto out_dirty;
 386         }
 387
 388         EXT4_I(inode)->i_projid = kprojid;
 389         inode->i_ctime = current_time(inode);
 390 out_dirty:
 391         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 392         if (!err)
 393                 err = rc;
 394 out_stop:
 395         ext4_journal_stop(handle);
 396 out_unlock:
 397         inode_unlock(inode);
 398         mnt_drop_write_file(filp);
 399         return err;
 400 }
 401 #else
 402 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 403 {
 404         if (projid != EXT4_DEF_PROJID)
 405                 return -EOPNOTSUPP;
 406         return 0;
 407 }
 408 #endif
 409
 410 /* Transfer internal flags to xflags */
 411 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 412 {
 413         __u32 xflags = 0;
 414
 415         if (iflags & EXT4_SYNC_FL)
 416                 xflags |= FS_XFLAG_SYNC;
 417         if (iflags & EXT4_IMMUTABLE_FL)
 418                 xflags |= FS_XFLAG_IMMUTABLE;
 419         if (iflags & EXT4_APPEND_FL)
 420                 xflags |= FS_XFLAG_APPEND;
 421         if (iflags & EXT4_NODUMP_FL)
 422                 xflags |= FS_XFLAG_NODUMP;
 423         if (iflags & EXT4_NOATIME_FL)
 424                 xflags |= FS_XFLAG_NOATIME;
 425         if (iflags & EXT4_PROJINHERIT_FL)
 426                 xflags |= FS_XFLAG_PROJINHERIT;
 427         return xflags;
 428 }
 429
 430 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 431                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 432                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 433
 434 /* Transfer xflags flags to internal */
 435 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 436 {
 437         unsigned long iflags = 0;
 438
 439         if (xflags & FS_XFLAG_SYNC)
 440                 iflags |= EXT4_SYNC_FL;
 441         if (xflags & FS_XFLAG_IMMUTABLE)
 442                 iflags |= EXT4_IMMUTABLE_FL;
 443         if (xflags & FS_XFLAG_APPEND)
 444                 iflags |= EXT4_APPEND_FL;
 445         if (xflags & FS_XFLAG_NODUMP)
 446                 iflags |= EXT4_NODUMP_FL;
 447         if (xflags & FS_XFLAG_NOATIME)
 448                 iflags |= EXT4_NOATIME_FL;
 449         if (xflags & FS_XFLAG_PROJINHERIT)
 450                 iflags |= EXT4_PROJINHERIT_FL;
 451
 452         return iflags;
 453 }
 454
 455 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 456 {
 457         struct ext4_sb_info *sbi = EXT4_SB(sb);
 458         __u32 flags;
 459
 460         if (!capable(CAP_SYS_ADMIN))
 461                 return -EPERM;
 462
 463         if (get_user(flags, (__u32 __user *)arg))
 464                 return -EFAULT;
 465
 466         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 467                 return -EINVAL;
 468
 469         if (ext4_forced_shutdown(sbi))
 470                 return 0;
 471
 472         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 473
 474         switch (flags) {
 475         case EXT4_GOING_FLAGS_DEFAULT:
 476                 freeze_bdev(sb->s_bdev);
 477                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 478                 thaw_bdev(sb->s_bdev, sb);
 479                 break;
 480         case EXT4_GOING_FLAGS_LOGFLUSH:
 481                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 482                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 483                         (void) ext4_force_commit(sb);
 484                         jbd2_journal_abort(sbi->s_journal, 0);
 485                 }
 486                 break;
 487         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 488                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 489                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 490                         msleep(100);
 491                         jbd2_journal_abort(sbi->s_journal, 0);
 492                 }
 493                 break;
 494         default:
 495                 return -EINVAL;
 496         }
 497         clear_opt(sb, DISCARD);
 498         return 0;
 499 }
 500
 501 struct getfsmap_info {
 502         struct super_block      *gi_sb;
 503         struct fsmap_head __user *gi_data;
 504         unsigned int            gi_idx;
 505         __u32                   gi_last_flags;
 506 };
 507
 508 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 509 {
 510         struct getfsmap_info *info = priv;
 511         struct fsmap fm;
 512
 513         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 514
 515         info->gi_last_flags = xfm->fmr_flags;
 516         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 517         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 518                         sizeof(struct fsmap)))
 519                 return -EFAULT;
 520
 521         return 0;
 522 }
 523
 524 static int ext4_ioc_getfsmap(struct super_block *sb,
 525                              struct fsmap_head __user *arg)
 526 {
 527         struct getfsmap_info info = {0};
 528         struct ext4_fsmap_head xhead = {0};
 529         struct fsmap_head head;
 530         bool aborted = false;
 531         int error;
 532
 533         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 534                 return -EFAULT;
 535         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 536             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 537                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 538             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 539                        sizeof(head.fmh_keys[1].fmr_reserved)))
 540                 return -EINVAL;
 541         /*
 542          * ext4 doesn't report file extents at all, so the only valid
 543          * file offsets are the magic ones (all zeroes or all ones).
 544          */
 545         if (head.fmh_keys[0].fmr_offset ||
 546             (head.fmh_keys[1].fmr_offset != 0 &&
 547              head.fmh_keys[1].fmr_offset != -1ULL))
 548                 return -EINVAL;
 549
 550         xhead.fmh_iflags = head.fmh_iflags;
 551         xhead.fmh_count = head.fmh_count;
 552         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 553         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 554
 555         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 556         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 557
 558         info.gi_sb = sb;
 559         info.gi_data = arg;
 560         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 561         if (error == EXT4_QUERY_RANGE_ABORT) {
 562                 error = 0;
 563                 aborted = true;
 564         } else if (error)
 565                 return error;
 566
 567         /* If we didn't abort, set the "last" flag in the last fmx */
 568         if (!aborted && info.gi_idx) {
 569                 info.gi_last_flags |= FMR_OF_LAST;
 570                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 571                                  &info.gi_last_flags,
 572                                  sizeof(info.gi_last_flags)))
 573                         return -EFAULT;
 574         }
 575
 576         /* copy back header */
 577         head.fmh_entries = xhead.fmh_entries;
 578         head.fmh_oflags = xhead.fmh_oflags;
 579         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 580                 return -EFAULT;
 581
 582         return 0;
 583 }
 584
 585 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 586 {
 587         struct inode *inode = file_inode(filp);
 588         struct super_block *sb = inode->i_sb;
 589         struct ext4_inode_info *ei = EXT4_I(inode);
 590         unsigned int flags;
 591
 592         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 593
 594         switch (cmd) {
 595         case FS_IOC_GETFSMAP:
 596                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 597         case EXT4_IOC_GETFLAGS:
 598                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 599                 return put_user(flags, (int __user *) arg);
 600         case EXT4_IOC_SETFLAGS: {
 601                 int err;
 602
 603                 if (!inode_owner_or_capable(inode))
 604                         return -EACCES;
 605
 606                 if (get_user(flags, (int __user *) arg))
 607                         return -EFAULT;
 608
 609                 if (flags & ~EXT4_FL_USER_VISIBLE)
 610                         return -EOPNOTSUPP;
 611                 /*
 612                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 613                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 614                  * more restrictive than just silently masking off visible but
 615                  * not settable flags as we always did.
 616                  */
 617                 flags &= EXT4_FL_USER_MODIFIABLE;
 618                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 619                         return -EOPNOTSUPP;
 620
 621                 err = mnt_want_write_file(filp);
 622                 if (err)
 623                         return err;
 624
 625                 inode_lock(inode);
 626                 err = ext4_ioctl_setflags(inode, flags);
 627                 inode_unlock(inode);
 628                 mnt_drop_write_file(filp);
 629                 return err;
 630         }
 631         case EXT4_IOC_GETVERSION:
 632         case EXT4_IOC_GETVERSION_OLD:
 633                 return put_user(inode->i_generation, (int __user *) arg);
 634         case EXT4_IOC_SETVERSION:
 635         case EXT4_IOC_SETVERSION_OLD: {
 636                 handle_t *handle;
 637                 struct ext4_iloc iloc;
 638                 __u32 generation;
 639                 int err;
 640
 641                 if (!inode_owner_or_capable(inode))
 642                         return -EPERM;
 643
 644                 if (ext4_has_metadata_csum(inode->i_sb)) {
 645                         ext4_warning(sb, "Setting inode version is not "
 646                                      "supported with metadata_csum enabled.");
 647                         return -ENOTTY;
 648                 }
 649
 650                 err = mnt_want_write_file(filp);
 651                 if (err)
 652                         return err;
 653                 if (get_user(generation, (int __user *) arg)) {
 654                         err = -EFAULT;
 655                         goto setversion_out;
 656                 }
 657
 658                 inode_lock(inode);
 659                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 660                 if (IS_ERR(handle)) {
 661                         err = PTR_ERR(handle);
 662                         goto unlock_out;
 663                 }
 664                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 665                 if (err == 0) {
 666                         inode->i_ctime = current_time(inode);
 667                         inode->i_generation = generation;
 668                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 669                 }
 670                 ext4_journal_stop(handle);
 671
 672 unlock_out:
 673                 inode_unlock(inode);
 674 setversion_out:
 675                 mnt_drop_write_file(filp);
 676                 return err;
 677         }
 678         case EXT4_IOC_GROUP_EXTEND: {
 679                 ext4_fsblk_t n_blocks_count;
 680                 int err, err2=0;
 681
 682                 err = ext4_resize_begin(sb);
 683                 if (err)
 684                         return err;
 685
 686                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 687                         err = -EFAULT;
 688                         goto group_extend_out;
 689                 }
 690
 691                 if (ext4_has_feature_bigalloc(sb)) {
 692                         ext4_msg(sb, KERN_ERR,
 693                                  "Online resizing not supported with bigalloc");
 694                         err = -EOPNOTSUPP;
 695                         goto group_extend_out;
 696                 }
 697
 698                 err = mnt_want_write_file(filp);
 699                 if (err)
 700                         goto group_extend_out;
 701
 702                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 703                 if (EXT4_SB(sb)->s_journal) {
 704                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 705                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 706                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 707                 }
 708                 if (err == 0)
 709                         err = err2;
 710                 mnt_drop_write_file(filp);
 711 group_extend_out:
 712                 ext4_resize_end(sb);
 713                 return err;
 714         }
 715
 716         case EXT4_IOC_MOVE_EXT: {
 717                 struct move_extent me;
 718                 struct fd donor;
 719                 int err;
 720
 721                 if (!(filp->f_mode & FMODE_READ) ||
 722                     !(filp->f_mode & FMODE_WRITE))
 723                         return -EBADF;
 724
 725                 if (copy_from_user(&me,
 726                         (struct move_extent __user *)arg, sizeof(me)))
 727                         return -EFAULT;
 728                 me.moved_len = 0;
 729
 730                 donor = fdget(me.donor_fd);
 731                 if (!donor.file)
 732                         return -EBADF;
 733
 734                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 735                         err = -EBADF;
 736                         goto mext_out;
 737                 }
 738
 739                 if (ext4_has_feature_bigalloc(sb)) {
 740                         ext4_msg(sb, KERN_ERR,
 741                                  "Online defrag not supported with bigalloc");
 742                         err = -EOPNOTSUPP;
 743                         goto mext_out;
 744                 } else if (IS_DAX(inode)) {
 745                         ext4_msg(sb, KERN_ERR,
 746                                  "Online defrag not supported with DAX");
 747                         err = -EOPNOTSUPP;
 748                         goto mext_out;
 749                 }
 750
 751                 err = mnt_want_write_file(filp);
 752                 if (err)
 753                         goto mext_out;
 754
 755                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 756                                         me.donor_start, me.len, &me.moved_len);
 757                 mnt_drop_write_file(filp);
 758
 759                 if (copy_to_user((struct move_extent __user *)arg,
 760                                  &me, sizeof(me)))
 761                         err = -EFAULT;
 762 mext_out:
 763                 fdput(donor);
 764                 return err;
 765         }
 766
 767         case EXT4_IOC_GROUP_ADD: {
 768                 struct ext4_new_group_data input;
 769                 int err, err2=0;
 770
 771                 err = ext4_resize_begin(sb);
 772                 if (err)
 773                         return err;
 774
 775                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 776                                 sizeof(input))) {
 777                         err = -EFAULT;
 778                         goto group_add_out;
 779                 }
 780
 781                 if (ext4_has_feature_bigalloc(sb)) {
 782                         ext4_msg(sb, KERN_ERR,
 783                                  "Online resizing not supported with bigalloc");
 784                         err = -EOPNOTSUPP;
 785                         goto group_add_out;
 786                 }
 787
 788                 err = mnt_want_write_file(filp);
 789                 if (err)
 790                         goto group_add_out;
 791
 792                 err = ext4_group_add(sb, &input);
 793                 if (EXT4_SB(sb)->s_journal) {
 794                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 795                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 796                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 797                 }
 798                 if (err == 0)
 799                         err = err2;
 800                 mnt_drop_write_file(filp);
 801                 if (!err && ext4_has_group_desc_csum(sb) &&
 802                     test_opt(sb, INIT_INODE_TABLE))
 803                         err = ext4_register_li_request(sb, input.group);
 804 group_add_out:
 805                 ext4_resize_end(sb);
 806                 return err;
 807         }
 808
 809         case EXT4_IOC_MIGRATE:
 810         {
 811                 int err;
 812                 if (!inode_owner_or_capable(inode))
 813                         return -EACCES;
 814
 815                 err = mnt_want_write_file(filp);
 816                 if (err)
 817                         return err;
 818                 /*
 819                  * inode_mutex prevent write and truncate on the file.
 820                  * Read still goes through. We take i_data_sem in
 821                  * ext4_ext_swap_inode_data before we switch the
 822                  * inode format to prevent read.
 823                  */
 824                 inode_lock((inode));
 825                 err = ext4_ext_migrate(inode);
 826                 inode_unlock((inode));
 827                 mnt_drop_write_file(filp);
 828                 return err;
 829         }
 830
 831         case EXT4_IOC_ALLOC_DA_BLKS:
 832         {
 833                 int err;
 834                 if (!inode_owner_or_capable(inode))
 835                         return -EACCES;
 836
 837                 err = mnt_want_write_file(filp);
 838                 if (err)
 839                         return err;
 840                 err = ext4_alloc_da_blocks(inode);
 841                 mnt_drop_write_file(filp);
 842                 return err;
 843         }
 844
 845         case EXT4_IOC_SWAP_BOOT:
 846         {
 847                 int err;
 848                 if (!(filp->f_mode & FMODE_WRITE))
 849                         return -EBADF;
 850                 err = mnt_want_write_file(filp);
 851                 if (err)
 852                         return err;
 853                 err = swap_inode_boot_loader(sb, inode);
 854                 mnt_drop_write_file(filp);
 855                 return err;
 856         }
 857
 858         case EXT4_IOC_RESIZE_FS: {
 859                 ext4_fsblk_t n_blocks_count;
 860                 int err = 0, err2 = 0;
 861                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 862
 863                 if (ext4_has_feature_bigalloc(sb)) {
 864                         ext4_msg(sb, KERN_ERR,
 865                                  "Online resizing not (yet) supported with bigalloc");
 866                         return -EOPNOTSUPP;
 867                 }
 868
 869                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 870                                    sizeof(__u64))) {
 871                         return -EFAULT;
 872                 }
 873
 874                 err = ext4_resize_begin(sb);
 875                 if (err)
 876                         return err;
 877
 878                 err = mnt_want_write_file(filp);
 879                 if (err)
 880                         goto resizefs_out;
 881
 882                 err = ext4_resize_fs(sb, n_blocks_count);
 883                 if (EXT4_SB(sb)->s_journal) {
 884                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 885                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 886                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 887                 }
 888                 if (err == 0)
 889                         err = err2;
 890                 mnt_drop_write_file(filp);
 891                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 892                     ext4_has_group_desc_csum(sb) &&
 893                     test_opt(sb, INIT_INODE_TABLE))
 894                         err = ext4_register_li_request(sb, o_group);
 895
 896 resizefs_out:
 897                 ext4_resize_end(sb);
 898                 return err;
 899         }
 900
 901         case FITRIM:
 902         {
 903                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 904                 struct fstrim_range range;
 905                 int ret = 0;
 906
 907                 if (!capable(CAP_SYS_ADMIN))
 908                         return -EPERM;
 909
 910                 if (!blk_queue_discard(q))
 911                         return -EOPNOTSUPP;
 912
 913                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 914                     sizeof(range)))
 915                         return -EFAULT;
 916
 917                 range.minlen = max((unsigned int)range.minlen,
 918                                    q->limits.discard_granularity);
 919                 ret = ext4_trim_fs(sb, &range);
 920                 if (ret < 0)
 921                         return ret;
 922
 923                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 924                     sizeof(range)))
 925                         return -EFAULT;
 926
 927                 return 0;
 928         }
 929         case EXT4_IOC_PRECACHE_EXTENTS:
 930                 return ext4_ext_precache(inode);
 931
 932         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 933                 if (!ext4_has_feature_encrypt(sb))
 934                         return -EOPNOTSUPP;
 935                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 936
 937         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 938 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 939                 int err, err2;
 940                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 941                 handle_t *handle;
 942
 943                 if (!ext4_has_feature_encrypt(sb))
 944                         return -EOPNOTSUPP;
 945                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 946                         err = mnt_want_write_file(filp);
 947                         if (err)
 948                                 return err;
 949                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 950                         if (IS_ERR(handle)) {
 951                                 err = PTR_ERR(handle);
 952                                 goto pwsalt_err_exit;
 953                         }
 954                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 955                         if (err)
 956                                 goto pwsalt_err_journal;
 957                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 958                         err = ext4_handle_dirty_metadata(handle, NULL,
 959                                                          sbi->s_sbh);
 960                 pwsalt_err_journal:
 961                         err2 = ext4_journal_stop(handle);
 962                         if (err2 && !err)
 963                                 err = err2;
 964                 pwsalt_err_exit:
 965                         mnt_drop_write_file(filp);
 966                         if (err)
 967                                 return err;
 968                 }
 969                 if (copy_to_user((void __user *) arg,
 970                                  sbi->s_es->s_encrypt_pw_salt, 16))
 971                         return -EFAULT;
 972                 return 0;
 973 #else
 974                 return -EOPNOTSUPP;
 975 #endif
 976         }
 977         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 978                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 979
 980         case EXT4_IOC_FSGETXATTR:
 981         {
 982                 struct fsxattr fa;
 983
 984                 memset(&fa, 0, sizeof(struct fsxattr));
 985                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 986
 987                 if (ext4_has_feature_project(inode->i_sb)) {
 988                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 989                                 EXT4_I(inode)->i_projid);
 990                 }
 991
 992                 if (copy_to_user((struct fsxattr __user *)arg,
 993                                  &fa, sizeof(fa)))
 994                         return -EFAULT;
 995                 return 0;
 996         }
 997         case EXT4_IOC_FSSETXATTR:
 998         {
 999                 struct fsxattr fa;
1000                 int err;
1001
1002                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1003                                    sizeof(fa)))
1004                         return -EFAULT;
1005
1006                 /* Make sure caller has proper permission */
1007                 if (!inode_owner_or_capable(inode))
1008                         return -EACCES;
1009
1010                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1011                         return -EOPNOTSUPP;
1012
1013                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1014                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1015                         return -EOPNOTSUPP;
1016
1017                 err = mnt_want_write_file(filp);
1018                 if (err)
1019                         return err;
1020
1021                 inode_lock(inode);
1022                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1023                          (flags & EXT4_FL_XFLAG_VISIBLE);
1024                 err = ext4_ioctl_setflags(inode, flags);
1025                 inode_unlock(inode);
1026                 mnt_drop_write_file(filp);
1027                 if (err)
1028                         return err;
1029
1030                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1031                 if (err)
1032                         return err;
1033
1034                 return 0;
1035         }
1036         case EXT4_IOC_SHUTDOWN:
1037                 return ext4_shutdown(sb, arg);
1038         default:
1039                 return -ENOTTY;
1040         }
1041 }
1042
1043 #ifdef CONFIG_COMPAT
1044 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1045 {
1046         /* These are just misnamed, they actually get/put from/to user an int */
1047         switch (cmd) {
1048         case EXT4_IOC32_GETFLAGS:
1049                 cmd = EXT4_IOC_GETFLAGS;
1050                 break;
1051         case EXT4_IOC32_SETFLAGS:
1052                 cmd = EXT4_IOC_SETFLAGS;
1053                 break;
1054         case EXT4_IOC32_GETVERSION:
1055                 cmd = EXT4_IOC_GETVERSION;
1056                 break;
1057         case EXT4_IOC32_SETVERSION:
1058                 cmd = EXT4_IOC_SETVERSION;
1059                 break;
1060         case EXT4_IOC32_GROUP_EXTEND:
1061                 cmd = EXT4_IOC_GROUP_EXTEND;
1062                 break;
1063         case EXT4_IOC32_GETVERSION_OLD:
1064                 cmd = EXT4_IOC_GETVERSION_OLD;
1065                 break;
1066         case EXT4_IOC32_SETVERSION_OLD:
1067                 cmd = EXT4_IOC_SETVERSION_OLD;
1068                 break;
1069         case EXT4_IOC32_GETRSVSZ:
1070                 cmd = EXT4_IOC_GETRSVSZ;
1071                 break;
1072         case EXT4_IOC32_SETRSVSZ:
1073                 cmd = EXT4_IOC_SETRSVSZ;
1074                 break;
1075         case EXT4_IOC32_GROUP_ADD: {
1076                 struct compat_ext4_new_group_input __user *uinput;
1077                 struct ext4_new_group_input input;
1078                 mm_segment_t old_fs;
1079                 int err;
1080
1081                 uinput = compat_ptr(arg);
1082                 err = get_user(input.group, &uinput->group);
1083                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1084                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1085                 err |= get_user(input.inode_table, &uinput->inode_table);
1086                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1087                 err |= get_user(input.reserved_blocks,
1088                                 &uinput->reserved_blocks);
1089                 if (err)
1090                         return -EFAULT;
1091                 old_fs = get_fs();
1092                 set_fs(KERNEL_DS);
1093                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
1094                                  (unsigned long) &input);
1095                 set_fs(old_fs);
1096                 return err;
1097         }
1098         case EXT4_IOC_MOVE_EXT:
1099         case EXT4_IOC_RESIZE_FS:
1100         case EXT4_IOC_PRECACHE_EXTENTS:
1101         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1102         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1103         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1104         case EXT4_IOC_SHUTDOWN:
1105         case FS_IOC_GETFSMAP:
1106                 break;
1107         default:
1108                 return -ENOIOCTLCMD;
1109         }
1110         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1111 }
1112 #endif