fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/random.h>
  19 #include <linux/uuid.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/delay.h>
  22 #include <linux/iversion.h>
  23 #include "ext4_jbd2.h"
  24 #include "ext4.h"
  25 #include <linux/fsmap.h>
  26 #include "fsmap.h"
  27 #include <trace/events/ext4.h>
  28
  29 /**
  30  * Swap memory between @a and @b for @len bytes.
  31  *
  32  * @a:          pointer to first memory area
  33  * @b:          pointer to second memory area
  34  * @len:        number of bytes to swap
  35  *
  36  */
  37 static void memswap(void *a, void *b, size_t len)
  38 {
  39         unsigned char *ap, *bp;
  40
  41         ap = (unsigned char *)a;
  42         bp = (unsigned char *)b;
  43         while (len-- > 0) {
  44                 swap(*ap, *bp);
  45                 ap++;
  46                 bp++;
  47         }
  48 }
  49
  50 /**
  51  * Swap i_data and associated attributes between @inode1 and @inode2.
  52  * This function is used for the primary swap between inode1 and inode2
  53  * and also to revert this primary swap in case of errors.
  54  *
  55  * Therefore you have to make sure, that calling this method twice
  56  * will revert all changes.
  57  *
  58  * @inode1:     pointer to first inode
  59  * @inode2:     pointer to second inode
  60  */
  61 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  62 {
  63         loff_t isize;
  64         struct ext4_inode_info *ei1;
  65         struct ext4_inode_info *ei2;
  66         unsigned long tmp;
  67
  68         ei1 = EXT4_I(inode1);
  69         ei2 = EXT4_I(inode2);
  70
  71         swap(inode1->i_version, inode2->i_version);
  72         swap(inode1->i_atime, inode2->i_atime);
  73         swap(inode1->i_mtime, inode2->i_mtime);
  74
  75         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  76         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
  77         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
  78                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
  79         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
  80         swap(ei1->i_disksize, ei2->i_disksize);
  81         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  82         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  83
  84         isize = i_size_read(inode1);
  85         i_size_write(inode1, i_size_read(inode2));
  86         i_size_write(inode2, isize);
  87 }
  88
  89 static void reset_inode_seed(struct inode *inode)
  90 {
  91         struct ext4_inode_info *ei = EXT4_I(inode);
  92         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
  93         __le32 inum = cpu_to_le32(inode->i_ino);
  94         __le32 gen = cpu_to_le32(inode->i_generation);
  95         __u32 csum;
  96
  97         if (!ext4_has_metadata_csum(inode->i_sb))
  98                 return;
  99
 100         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
 101         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 102 }
 103
 104 /**
 105  * Swap the information from the given @inode and the inode
 106  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 107  * important fields of the inodes.
 108  *
 109  * @sb:         the super block of the filesystem
 110  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 111  *
 112  */
 113 static long swap_inode_boot_loader(struct super_block *sb,
 114                                 struct inode *inode)
 115 {
 116         handle_t *handle;
 117         int err;
 118         struct inode *inode_bl;
 119         struct ext4_inode_info *ei_bl;
 120         qsize_t size, size_bl, diff;
 121         blkcnt_t blocks;
 122         unsigned short bytes;
 123
 124         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 125         if (IS_ERR(inode_bl))
 126                 return PTR_ERR(inode_bl);
 127         ei_bl = EXT4_I(inode_bl);
 128
 129         /* Protect orig inodes against a truncate and make sure,
 130          * that only 1 swap_inode_boot_loader is running. */
 131         lock_two_nondirectories(inode, inode_bl);
 132
 133         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 134             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 135             (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) ||
 136             ext4_has_inline_data(inode)) {
 137                 err = -EINVAL;
 138                 goto journal_err_out;
 139         }
 140
 141         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 142             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 143                 err = -EPERM;
 144                 goto journal_err_out;
 145         }
 146
 147         down_write(&EXT4_I(inode)->i_mmap_sem);
 148         err = filemap_write_and_wait(inode->i_mapping);
 149         if (err)
 150                 goto err_out;
 151
 152         err = filemap_write_and_wait(inode_bl->i_mapping);
 153         if (err)
 154                 goto err_out;
 155
 156         /* Wait for all existing dio workers */
 157         inode_dio_wait(inode);
 158         inode_dio_wait(inode_bl);
 159
 160         truncate_inode_pages(&inode->i_data, 0);
 161         truncate_inode_pages(&inode_bl->i_data, 0);
 162
 163         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 164         if (IS_ERR(handle)) {
 165                 err = -EINVAL;
 166                 goto err_out;
 167         }
 168
 169         /* Protect extent tree against block allocations via delalloc */
 170         ext4_double_down_write_data_sem(inode, inode_bl);
 171
 172         if (inode_bl->i_nlink == 0) {
 173                 /* this inode has never been used as a BOOT_LOADER */
 174                 set_nlink(inode_bl, 1);
 175                 i_uid_write(inode_bl, 0);
 176                 i_gid_write(inode_bl, 0);
 177                 inode_bl->i_flags = 0;
 178                 ei_bl->i_flags = 0;
 179                 inode_set_iversion(inode_bl, 1);
 180                 i_size_write(inode_bl, 0);
 181                 inode_bl->i_mode = S_IFREG;
 182                 if (ext4_has_feature_extents(sb)) {
 183                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 184                         ext4_ext_tree_init(handle, inode_bl);
 185                 } else
 186                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 187         }
 188
 189         err = dquot_initialize(inode);
 190         if (err)
 191                 goto err_out1;
 192
 193         size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes;
 194         size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes;
 195         diff = size - size_bl;
 196         swap_inode_data(inode, inode_bl);
 197
 198         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 199
 200         inode->i_generation = prandom_u32();
 201         inode_bl->i_generation = prandom_u32();
 202         reset_inode_seed(inode);
 203         reset_inode_seed(inode_bl);
 204
 205         ext4_discard_preallocations(inode);
 206
 207         err = ext4_mark_inode_dirty(handle, inode);
 208         if (err < 0) {
 209                 /* No need to update quota information. */
 210                 ext4_warning(inode->i_sb,
 211                         "couldn't mark inode #%lu dirty (err %d)",
 212                         inode->i_ino, err);
 213                 /* Revert all changes: */
 214                 swap_inode_data(inode, inode_bl);
 215                 ext4_mark_inode_dirty(handle, inode);
 216                 goto err_out1;
 217         }
 218
 219         blocks = inode_bl->i_blocks;
 220         bytes = inode_bl->i_bytes;
 221         inode_bl->i_blocks = inode->i_blocks;
 222         inode_bl->i_bytes = inode->i_bytes;
 223         err = ext4_mark_inode_dirty(handle, inode_bl);
 224         if (err < 0) {
 225                 /* No need to update quota information. */
 226                 ext4_warning(inode_bl->i_sb,
 227                         "couldn't mark inode #%lu dirty (err %d)",
 228                         inode_bl->i_ino, err);
 229                 goto revert;
 230         }
 231
 232         /* Bootloader inode should not be counted into quota information. */
 233         if (diff > 0)
 234                 dquot_free_space(inode, diff);
 235         else
 236                 err = dquot_alloc_space(inode, -1 * diff);
 237
 238         if (err < 0) {
 239 revert:
 240                 /* Revert all changes: */
 241                 inode_bl->i_blocks = blocks;
 242                 inode_bl->i_bytes = bytes;
 243                 swap_inode_data(inode, inode_bl);
 244                 ext4_mark_inode_dirty(handle, inode);
 245                 ext4_mark_inode_dirty(handle, inode_bl);
 246         }
 247
 248 err_out1:
 249         ext4_journal_stop(handle);
 250         ext4_double_up_write_data_sem(inode, inode_bl);
 251
 252 err_out:
 253         up_write(&EXT4_I(inode)->i_mmap_sem);
 254 journal_err_out:
 255         unlock_two_nondirectories(inode, inode_bl);
 256         iput(inode_bl);
 257         return err;
 258 }
 259
 260 #ifdef CONFIG_FS_ENCRYPTION
 261 static int uuid_is_zero(__u8 u[16])
 262 {
 263         int     i;
 264
 265         for (i = 0; i < 16; i++)
 266                 if (u[i])
 267                         return 0;
 268         return 1;
 269 }
 270 #endif
 271
 272 static int ext4_ioctl_setflags(struct inode *inode,
 273                                unsigned int flags)
 274 {
 275         struct ext4_inode_info *ei = EXT4_I(inode);
 276         handle_t *handle = NULL;
 277         int err = -EPERM, migrate = 0;
 278         struct ext4_iloc iloc;
 279         unsigned int oldflags, mask, i;
 280         unsigned int jflag;
 281
 282         /* Is it quota file? Do not allow user to mess with it */
 283         if (ext4_is_quota_file(inode))
 284                 goto flags_out;
 285
 286         oldflags = ei->i_flags;
 287
 288         /* The JOURNAL_DATA flag is modifiable only by root */
 289         jflag = flags & EXT4_JOURNAL_DATA_FL;
 290
 291         /*
 292          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 293          * the relevant capability.
 294          *
 295          * This test looks nicer. Thanks to Pauline Middelink
 296          */
 297         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 298                 if (!capable(CAP_LINUX_IMMUTABLE))
 299                         goto flags_out;
 300         }
 301
 302         /*
 303          * The JOURNAL_DATA flag can only be changed by
 304          * the relevant capability.
 305          */
 306         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 307                 if (!capable(CAP_SYS_RESOURCE))
 308                         goto flags_out;
 309         }
 310         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 311                 migrate = 1;
 312
 313         if (flags & EXT4_EOFBLOCKS_FL) {
 314                 /* we don't support adding EOFBLOCKS flag */
 315                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 316                         err = -EOPNOTSUPP;
 317                         goto flags_out;
 318                 }
 319         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 320                 err = ext4_truncate(inode);
 321                 if (err)
 322                         goto flags_out;
 323         }
 324
 325         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 326         if (IS_ERR(handle)) {
 327                 err = PTR_ERR(handle);
 328                 goto flags_out;
 329         }
 330         if (IS_SYNC(inode))
 331                 ext4_handle_sync(handle);
 332         err = ext4_reserve_inode_write(handle, inode, &iloc);
 333         if (err)
 334                 goto flags_err;
 335
 336         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 337                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 338                         continue;
 339                 /* These flags get special treatment later */
 340                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 341                         continue;
 342                 if (mask & flags)
 343                         ext4_set_inode_flag(inode, i);
 344                 else
 345                         ext4_clear_inode_flag(inode, i);
 346         }
 347
 348         ext4_set_inode_flags(inode);
 349         inode->i_ctime = current_time(inode);
 350
 351         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 352 flags_err:
 353         ext4_journal_stop(handle);
 354         if (err)
 355                 goto flags_out;
 356
 357         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 358                 /*
 359                  * Changes to the journaling mode can cause unsafe changes to
 360                  * S_DAX if we are using the DAX mount option.
 361                  */
 362                 if (test_opt(inode->i_sb, DAX)) {
 363                         err = -EBUSY;
 364                         goto flags_out;
 365                 }
 366
 367                 err = ext4_change_inode_journal_flag(inode, jflag);
 368                 if (err)
 369                         goto flags_out;
 370         }
 371         if (migrate) {
 372                 if (flags & EXT4_EXTENTS_FL)
 373                         err = ext4_ext_migrate(inode);
 374                 else
 375                         err = ext4_ind_migrate(inode);
 376         }
 377
 378 flags_out:
 379         return err;
 380 }
 381
 382 #ifdef CONFIG_QUOTA
 383 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 384 {
 385         struct inode *inode = file_inode(filp);
 386         struct super_block *sb = inode->i_sb;
 387         struct ext4_inode_info *ei = EXT4_I(inode);
 388         int err, rc;
 389         handle_t *handle;
 390         kprojid_t kprojid;
 391         struct ext4_iloc iloc;
 392         struct ext4_inode *raw_inode;
 393         struct dquot *transfer_to[MAXQUOTAS] = { };
 394
 395         if (!ext4_has_feature_project(sb)) {
 396                 if (projid != EXT4_DEF_PROJID)
 397                         return -EOPNOTSUPP;
 398                 else
 399                         return 0;
 400         }
 401
 402         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 403                 return -EOPNOTSUPP;
 404
 405         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 406
 407         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 408                 return 0;
 409
 410         err = -EPERM;
 411         /* Is it quota file? Do not allow user to mess with it */
 412         if (ext4_is_quota_file(inode))
 413                 return err;
 414
 415         err = ext4_get_inode_loc(inode, &iloc);
 416         if (err)
 417                 return err;
 418
 419         raw_inode = ext4_raw_inode(&iloc);
 420         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 421                 err = ext4_expand_extra_isize(inode,
 422                                               EXT4_SB(sb)->s_want_extra_isize,
 423                                               &iloc);
 424                 if (err)
 425                         return err;
 426         } else {
 427                 brelse(iloc.bh);
 428         }
 429
 430         err = dquot_initialize(inode);
 431         if (err)
 432                 return err;
 433
 434         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 435                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 436                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 437         if (IS_ERR(handle))
 438                 return PTR_ERR(handle);
 439
 440         err = ext4_reserve_inode_write(handle, inode, &iloc);
 441         if (err)
 442                 goto out_stop;
 443
 444         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 445         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 446
 447                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 448                  * counts xattr inode references.
 449                  */
 450                 down_read(&EXT4_I(inode)->xattr_sem);
 451                 err = __dquot_transfer(inode, transfer_to);
 452                 up_read(&EXT4_I(inode)->xattr_sem);
 453                 dqput(transfer_to[PRJQUOTA]);
 454                 if (err)
 455                         goto out_dirty;
 456         }
 457
 458         EXT4_I(inode)->i_projid = kprojid;
 459         inode->i_ctime = current_time(inode);
 460 out_dirty:
 461         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 462         if (!err)
 463                 err = rc;
 464 out_stop:
 465         ext4_journal_stop(handle);
 466         return err;
 467 }
 468 #else
 469 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 470 {
 471         if (projid != EXT4_DEF_PROJID)
 472                 return -EOPNOTSUPP;
 473         return 0;
 474 }
 475 #endif
 476
 477 /* Transfer internal flags to xflags */
 478 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 479 {
 480         __u32 xflags = 0;
 481
 482         if (iflags & EXT4_SYNC_FL)
 483                 xflags |= FS_XFLAG_SYNC;
 484         if (iflags & EXT4_IMMUTABLE_FL)
 485                 xflags |= FS_XFLAG_IMMUTABLE;
 486         if (iflags & EXT4_APPEND_FL)
 487                 xflags |= FS_XFLAG_APPEND;
 488         if (iflags & EXT4_NODUMP_FL)
 489                 xflags |= FS_XFLAG_NODUMP;
 490         if (iflags & EXT4_NOATIME_FL)
 491                 xflags |= FS_XFLAG_NOATIME;
 492         if (iflags & EXT4_PROJINHERIT_FL)
 493                 xflags |= FS_XFLAG_PROJINHERIT;
 494         return xflags;
 495 }
 496
 497 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 498                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 499                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 500
 501 /* Transfer xflags flags to internal */
 502 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 503 {
 504         unsigned long iflags = 0;
 505
 506         if (xflags & FS_XFLAG_SYNC)
 507                 iflags |= EXT4_SYNC_FL;
 508         if (xflags & FS_XFLAG_IMMUTABLE)
 509                 iflags |= EXT4_IMMUTABLE_FL;
 510         if (xflags & FS_XFLAG_APPEND)
 511                 iflags |= EXT4_APPEND_FL;
 512         if (xflags & FS_XFLAG_NODUMP)
 513                 iflags |= EXT4_NODUMP_FL;
 514         if (xflags & FS_XFLAG_NOATIME)
 515                 iflags |= EXT4_NOATIME_FL;
 516         if (xflags & FS_XFLAG_PROJINHERIT)
 517                 iflags |= EXT4_PROJINHERIT_FL;
 518
 519         return iflags;
 520 }
 521
 522 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 523 {
 524         struct ext4_sb_info *sbi = EXT4_SB(sb);
 525         __u32 flags;
 526
 527         if (!capable(CAP_SYS_ADMIN))
 528                 return -EPERM;
 529
 530         if (get_user(flags, (__u32 __user *)arg))
 531                 return -EFAULT;
 532
 533         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 534                 return -EINVAL;
 535
 536         if (ext4_forced_shutdown(sbi))
 537                 return 0;
 538
 539         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 540         trace_ext4_shutdown(sb, flags);
 541
 542         switch (flags) {
 543         case EXT4_GOING_FLAGS_DEFAULT:
 544                 freeze_bdev(sb->s_bdev);
 545                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 546                 thaw_bdev(sb->s_bdev, sb);
 547                 break;
 548         case EXT4_GOING_FLAGS_LOGFLUSH:
 549                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 550                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 551                         (void) ext4_force_commit(sb);
 552                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 553                 }
 554                 break;
 555         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 556                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 557                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 558                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 559                 break;
 560         default:
 561                 return -EINVAL;
 562         }
 563         clear_opt(sb, DISCARD);
 564         return 0;
 565 }
 566
 567 struct getfsmap_info {
 568         struct super_block      *gi_sb;
 569         struct fsmap_head __user *gi_data;
 570         unsigned int            gi_idx;
 571         __u32                   gi_last_flags;
 572 };
 573
 574 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 575 {
 576         struct getfsmap_info *info = priv;
 577         struct fsmap fm;
 578
 579         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 580
 581         info->gi_last_flags = xfm->fmr_flags;
 582         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 583         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 584                         sizeof(struct fsmap)))
 585                 return -EFAULT;
 586
 587         return 0;
 588 }
 589
 590 static int ext4_ioc_getfsmap(struct super_block *sb,
 591                              struct fsmap_head __user *arg)
 592 {
 593         struct getfsmap_info info = {0};
 594         struct ext4_fsmap_head xhead = {0};
 595         struct fsmap_head head;
 596         bool aborted = false;
 597         int error;
 598
 599         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 600                 return -EFAULT;
 601         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 602             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 603                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 604             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 605                        sizeof(head.fmh_keys[1].fmr_reserved)))
 606                 return -EINVAL;
 607         /*
 608          * ext4 doesn't report file extents at all, so the only valid
 609          * file offsets are the magic ones (all zeroes or all ones).
 610          */
 611         if (head.fmh_keys[0].fmr_offset ||
 612             (head.fmh_keys[1].fmr_offset != 0 &&
 613              head.fmh_keys[1].fmr_offset != -1ULL))
 614                 return -EINVAL;
 615
 616         xhead.fmh_iflags = head.fmh_iflags;
 617         xhead.fmh_count = head.fmh_count;
 618         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 619         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 620
 621         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 622         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 623
 624         info.gi_sb = sb;
 625         info.gi_data = arg;
 626         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 627         if (error == EXT4_QUERY_RANGE_ABORT) {
 628                 error = 0;
 629                 aborted = true;
 630         } else if (error)
 631                 return error;
 632
 633         /* If we didn't abort, set the "last" flag in the last fmx */
 634         if (!aborted && info.gi_idx) {
 635                 info.gi_last_flags |= FMR_OF_LAST;
 636                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 637                                  &info.gi_last_flags,
 638                                  sizeof(info.gi_last_flags)))
 639                         return -EFAULT;
 640         }
 641
 642         /* copy back header */
 643         head.fmh_entries = xhead.fmh_entries;
 644         head.fmh_oflags = xhead.fmh_oflags;
 645         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 646                 return -EFAULT;
 647
 648         return 0;
 649 }
 650
 651 static long ext4_ioctl_group_add(struct file *file,
 652                                  struct ext4_new_group_data *input)
 653 {
 654         struct super_block *sb = file_inode(file)->i_sb;
 655         int err, err2=0;
 656
 657         err = ext4_resize_begin(sb);
 658         if (err)
 659                 return err;
 660
 661         if (ext4_has_feature_bigalloc(sb)) {
 662                 ext4_msg(sb, KERN_ERR,
 663                          "Online resizing not supported with bigalloc");
 664                 err = -EOPNOTSUPP;
 665                 goto group_add_out;
 666         }
 667
 668         err = mnt_want_write_file(file);
 669         if (err)
 670                 goto group_add_out;
 671
 672         err = ext4_group_add(sb, input);
 673         if (EXT4_SB(sb)->s_journal) {
 674                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 675                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 676                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 677         }
 678         if (err == 0)
 679                 err = err2;
 680         mnt_drop_write_file(file);
 681         if (!err && ext4_has_group_desc_csum(sb) &&
 682             test_opt(sb, INIT_INODE_TABLE))
 683                 err = ext4_register_li_request(sb, input->group);
 684 group_add_out:
 685         ext4_resize_end(sb);
 686         return err;
 687 }
 688
 689 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 690 {
 691         /*
 692          * Project Quota ID state is only allowed to change from within the init
 693          * namespace. Enforce that restriction only if we are trying to change
 694          * the quota ID state. Everything else is allowed in user namespaces.
 695          */
 696         if (current_user_ns() == &init_user_ns)
 697                 return 0;
 698
 699         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 700                 return -EINVAL;
 701
 702         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 703                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 704                         return -EINVAL;
 705         } else {
 706                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 707                         return -EINVAL;
 708         }
 709
 710         return 0;
 711 }
 712
 713 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 714 {
 715         struct inode *inode = file_inode(filp);
 716         struct super_block *sb = inode->i_sb;
 717         struct ext4_inode_info *ei = EXT4_I(inode);
 718         unsigned int flags;
 719
 720         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 721
 722         switch (cmd) {
 723         case FS_IOC_GETFSMAP:
 724                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 725         case EXT4_IOC_GETFLAGS:
 726                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 727                 return put_user(flags, (int __user *) arg);
 728         case EXT4_IOC_SETFLAGS: {
 729                 int err;
 730
 731                 if (!inode_owner_or_capable(inode))
 732                         return -EACCES;
 733
 734                 if (get_user(flags, (int __user *) arg))
 735                         return -EFAULT;
 736
 737                 if (flags & ~EXT4_FL_USER_VISIBLE)
 738                         return -EOPNOTSUPP;
 739                 /*
 740                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 741                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 742                  * more restrictive than just silently masking off visible but
 743                  * not settable flags as we always did.
 744                  */
 745                 flags &= EXT4_FL_USER_MODIFIABLE;
 746                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 747                         return -EOPNOTSUPP;
 748
 749                 err = mnt_want_write_file(filp);
 750                 if (err)
 751                         return err;
 752
 753                 inode_lock(inode);
 754                 err = ext4_ioctl_setflags(inode, flags);
 755                 inode_unlock(inode);
 756                 mnt_drop_write_file(filp);
 757                 return err;
 758         }
 759         case EXT4_IOC_GETVERSION:
 760         case EXT4_IOC_GETVERSION_OLD:
 761                 return put_user(inode->i_generation, (int __user *) arg);
 762         case EXT4_IOC_SETVERSION:
 763         case EXT4_IOC_SETVERSION_OLD: {
 764                 handle_t *handle;
 765                 struct ext4_iloc iloc;
 766                 __u32 generation;
 767                 int err;
 768
 769                 if (!inode_owner_or_capable(inode))
 770                         return -EPERM;
 771
 772                 if (ext4_has_metadata_csum(inode->i_sb)) {
 773                         ext4_warning(sb, "Setting inode version is not "
 774                                      "supported with metadata_csum enabled.");
 775                         return -ENOTTY;
 776                 }
 777
 778                 err = mnt_want_write_file(filp);
 779                 if (err)
 780                         return err;
 781                 if (get_user(generation, (int __user *) arg)) {
 782                         err = -EFAULT;
 783                         goto setversion_out;
 784                 }
 785
 786                 inode_lock(inode);
 787                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 788                 if (IS_ERR(handle)) {
 789                         err = PTR_ERR(handle);
 790                         goto unlock_out;
 791                 }
 792                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 793                 if (err == 0) {
 794                         inode->i_ctime = current_time(inode);
 795                         inode->i_generation = generation;
 796                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 797                 }
 798                 ext4_journal_stop(handle);
 799
 800 unlock_out:
 801                 inode_unlock(inode);
 802 setversion_out:
 803                 mnt_drop_write_file(filp);
 804                 return err;
 805         }
 806         case EXT4_IOC_GROUP_EXTEND: {
 807                 ext4_fsblk_t n_blocks_count;
 808                 int err, err2=0;
 809
 810                 err = ext4_resize_begin(sb);
 811                 if (err)
 812                         return err;
 813
 814                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 815                         err = -EFAULT;
 816                         goto group_extend_out;
 817                 }
 818
 819                 if (ext4_has_feature_bigalloc(sb)) {
 820                         ext4_msg(sb, KERN_ERR,
 821                                  "Online resizing not supported with bigalloc");
 822                         err = -EOPNOTSUPP;
 823                         goto group_extend_out;
 824                 }
 825
 826                 err = mnt_want_write_file(filp);
 827                 if (err)
 828                         goto group_extend_out;
 829
 830                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 831                 if (EXT4_SB(sb)->s_journal) {
 832                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 833                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 834                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 835                 }
 836                 if (err == 0)
 837                         err = err2;
 838                 mnt_drop_write_file(filp);
 839 group_extend_out:
 840                 ext4_resize_end(sb);
 841                 return err;
 842         }
 843
 844         case EXT4_IOC_MOVE_EXT: {
 845                 struct move_extent me;
 846                 struct fd donor;
 847                 int err;
 848
 849                 if (!(filp->f_mode & FMODE_READ) ||
 850                     !(filp->f_mode & FMODE_WRITE))
 851                         return -EBADF;
 852
 853                 if (copy_from_user(&me,
 854                         (struct move_extent __user *)arg, sizeof(me)))
 855                         return -EFAULT;
 856                 me.moved_len = 0;
 857
 858                 donor = fdget(me.donor_fd);
 859                 if (!donor.file)
 860                         return -EBADF;
 861
 862                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 863                         err = -EBADF;
 864                         goto mext_out;
 865                 }
 866
 867                 if (ext4_has_feature_bigalloc(sb)) {
 868                         ext4_msg(sb, KERN_ERR,
 869                                  "Online defrag not supported with bigalloc");
 870                         err = -EOPNOTSUPP;
 871                         goto mext_out;
 872                 } else if (IS_DAX(inode)) {
 873                         ext4_msg(sb, KERN_ERR,
 874                                  "Online defrag not supported with DAX");
 875                         err = -EOPNOTSUPP;
 876                         goto mext_out;
 877                 }
 878
 879                 err = mnt_want_write_file(filp);
 880                 if (err)
 881                         goto mext_out;
 882
 883                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 884                                         me.donor_start, me.len, &me.moved_len);
 885                 mnt_drop_write_file(filp);
 886
 887                 if (copy_to_user((struct move_extent __user *)arg,
 888                                  &me, sizeof(me)))
 889                         err = -EFAULT;
 890 mext_out:
 891                 fdput(donor);
 892                 return err;
 893         }
 894
 895         case EXT4_IOC_GROUP_ADD: {
 896                 struct ext4_new_group_data input;
 897
 898                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 899                                 sizeof(input)))
 900                         return -EFAULT;
 901
 902                 return ext4_ioctl_group_add(filp, &input);
 903         }
 904
 905         case EXT4_IOC_MIGRATE:
 906         {
 907                 int err;
 908                 if (!inode_owner_or_capable(inode))
 909                         return -EACCES;
 910
 911                 err = mnt_want_write_file(filp);
 912                 if (err)
 913                         return err;
 914                 /*
 915                  * inode_mutex prevent write and truncate on the file.
 916                  * Read still goes through. We take i_data_sem in
 917                  * ext4_ext_swap_inode_data before we switch the
 918                  * inode format to prevent read.
 919                  */
 920                 inode_lock((inode));
 921                 err = ext4_ext_migrate(inode);
 922                 inode_unlock((inode));
 923                 mnt_drop_write_file(filp);
 924                 return err;
 925         }
 926
 927         case EXT4_IOC_ALLOC_DA_BLKS:
 928         {
 929                 int err;
 930                 if (!inode_owner_or_capable(inode))
 931                         return -EACCES;
 932
 933                 err = mnt_want_write_file(filp);
 934                 if (err)
 935                         return err;
 936                 err = ext4_alloc_da_blocks(inode);
 937                 mnt_drop_write_file(filp);
 938                 return err;
 939         }
 940
 941         case EXT4_IOC_SWAP_BOOT:
 942         {
 943                 int err;
 944                 if (!(filp->f_mode & FMODE_WRITE))
 945                         return -EBADF;
 946                 err = mnt_want_write_file(filp);
 947                 if (err)
 948                         return err;
 949                 err = swap_inode_boot_loader(sb, inode);
 950                 mnt_drop_write_file(filp);
 951                 return err;
 952         }
 953
 954         case EXT4_IOC_RESIZE_FS: {
 955                 ext4_fsblk_t n_blocks_count;
 956                 int err = 0, err2 = 0;
 957                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 958
 959                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 960                                    sizeof(__u64))) {
 961                         return -EFAULT;
 962                 }
 963
 964                 err = ext4_resize_begin(sb);
 965                 if (err)
 966                         return err;
 967
 968                 err = mnt_want_write_file(filp);
 969                 if (err)
 970                         goto resizefs_out;
 971
 972                 err = ext4_resize_fs(sb, n_blocks_count);
 973                 if (EXT4_SB(sb)->s_journal) {
 974                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 975                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 976                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 977                 }
 978                 if (err == 0)
 979                         err = err2;
 980                 mnt_drop_write_file(filp);
 981                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 982                     ext4_has_group_desc_csum(sb) &&
 983                     test_opt(sb, INIT_INODE_TABLE))
 984                         err = ext4_register_li_request(sb, o_group);
 985
 986 resizefs_out:
 987                 ext4_resize_end(sb);
 988                 return err;
 989         }
 990
 991         case FITRIM:
 992         {
 993                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 994                 struct fstrim_range range;
 995                 int ret = 0;
 996
 997                 if (!capable(CAP_SYS_ADMIN))
 998                         return -EPERM;
 999
1000                 if (!blk_queue_discard(q))
1001                         return -EOPNOTSUPP;
1002
1003                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
1004                     sizeof(range)))
1005                         return -EFAULT;
1006
1007                 range.minlen = max((unsigned int)range.minlen,
1008                                    q->limits.discard_granularity);
1009                 ret = ext4_trim_fs(sb, &range);
1010                 if (ret < 0)
1011                         return ret;
1012
1013                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1014                     sizeof(range)))
1015                         return -EFAULT;
1016
1017                 return 0;
1018         }
1019         case EXT4_IOC_PRECACHE_EXTENTS:
1020                 return ext4_ext_precache(inode);
1021
1022         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1023                 if (!ext4_has_feature_encrypt(sb))
1024                         return -EOPNOTSUPP;
1025                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1026
1027         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1028 #ifdef CONFIG_FS_ENCRYPTION
1029                 int err, err2;
1030                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1031                 handle_t *handle;
1032
1033                 if (!ext4_has_feature_encrypt(sb))
1034                         return -EOPNOTSUPP;
1035                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1036                         err = mnt_want_write_file(filp);
1037                         if (err)
1038                                 return err;
1039                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1040                         if (IS_ERR(handle)) {
1041                                 err = PTR_ERR(handle);
1042                                 goto pwsalt_err_exit;
1043                         }
1044                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1045                         if (err)
1046                                 goto pwsalt_err_journal;
1047                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1048                         err = ext4_handle_dirty_metadata(handle, NULL,
1049                                                          sbi->s_sbh);
1050                 pwsalt_err_journal:
1051                         err2 = ext4_journal_stop(handle);
1052                         if (err2 && !err)
1053                                 err = err2;
1054                 pwsalt_err_exit:
1055                         mnt_drop_write_file(filp);
1056                         if (err)
1057                                 return err;
1058                 }
1059                 if (copy_to_user((void __user *) arg,
1060                                  sbi->s_es->s_encrypt_pw_salt, 16))
1061                         return -EFAULT;
1062                 return 0;
1063 #else
1064                 return -EOPNOTSUPP;
1065 #endif
1066         }
1067         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1068                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1069
1070         case EXT4_IOC_FSGETXATTR:
1071         {
1072                 struct fsxattr fa;
1073
1074                 memset(&fa, 0, sizeof(struct fsxattr));
1075                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1076
1077                 if (ext4_has_feature_project(inode->i_sb)) {
1078                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1079                                 EXT4_I(inode)->i_projid);
1080                 }
1081
1082                 if (copy_to_user((struct fsxattr __user *)arg,
1083                                  &fa, sizeof(fa)))
1084                         return -EFAULT;
1085                 return 0;
1086         }
1087         case EXT4_IOC_FSSETXATTR:
1088         {
1089                 struct fsxattr fa;
1090                 int err;
1091
1092                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1093                                    sizeof(fa)))
1094                         return -EFAULT;
1095
1096                 /* Make sure caller has proper permission */
1097                 if (!inode_owner_or_capable(inode))
1098                         return -EACCES;
1099
1100                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1101                         return -EOPNOTSUPP;
1102
1103                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1104                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1105                         return -EOPNOTSUPP;
1106
1107                 err = mnt_want_write_file(filp);
1108                 if (err)
1109                         return err;
1110
1111                 inode_lock(inode);
1112                 err = ext4_ioctl_check_project(inode, &fa);
1113                 if (err)
1114                         goto out;
1115                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1116                          (flags & EXT4_FL_XFLAG_VISIBLE);
1117                 err = ext4_ioctl_setflags(inode, flags);
1118                 if (err)
1119                         goto out;
1120                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1121 out:
1122                 inode_unlock(inode);
1123                 mnt_drop_write_file(filp);
1124                 return err;
1125         }
1126         case EXT4_IOC_SHUTDOWN:
1127                 return ext4_shutdown(sb, arg);
1128         default:
1129                 return -ENOTTY;
1130         }
1131 }
1132
1133 #ifdef CONFIG_COMPAT
1134 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1135 {
1136         /* These are just misnamed, they actually get/put from/to user an int */
1137         switch (cmd) {
1138         case EXT4_IOC32_GETFLAGS:
1139                 cmd = EXT4_IOC_GETFLAGS;
1140                 break;
1141         case EXT4_IOC32_SETFLAGS:
1142                 cmd = EXT4_IOC_SETFLAGS;
1143                 break;
1144         case EXT4_IOC32_GETVERSION:
1145                 cmd = EXT4_IOC_GETVERSION;
1146                 break;
1147         case EXT4_IOC32_SETVERSION:
1148                 cmd = EXT4_IOC_SETVERSION;
1149                 break;
1150         case EXT4_IOC32_GROUP_EXTEND:
1151                 cmd = EXT4_IOC_GROUP_EXTEND;
1152                 break;
1153         case EXT4_IOC32_GETVERSION_OLD:
1154                 cmd = EXT4_IOC_GETVERSION_OLD;
1155                 break;
1156         case EXT4_IOC32_SETVERSION_OLD:
1157                 cmd = EXT4_IOC_SETVERSION_OLD;
1158                 break;
1159         case EXT4_IOC32_GETRSVSZ:
1160                 cmd = EXT4_IOC_GETRSVSZ;
1161                 break;
1162         case EXT4_IOC32_SETRSVSZ:
1163                 cmd = EXT4_IOC_SETRSVSZ;
1164                 break;
1165         case EXT4_IOC32_GROUP_ADD: {
1166                 struct compat_ext4_new_group_input __user *uinput;
1167                 struct ext4_new_group_data input;
1168                 int err;
1169
1170                 uinput = compat_ptr(arg);
1171                 err = get_user(input.group, &uinput->group);
1172                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1173                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1174                 err |= get_user(input.inode_table, &uinput->inode_table);
1175                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1176                 err |= get_user(input.reserved_blocks,
1177                                 &uinput->reserved_blocks);
1178                 if (err)
1179                         return -EFAULT;
1180                 return ext4_ioctl_group_add(file, &input);
1181         }
1182         case EXT4_IOC_MOVE_EXT:
1183         case EXT4_IOC_RESIZE_FS:
1184         case EXT4_IOC_PRECACHE_EXTENTS:
1185         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1186         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1187         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1188         case EXT4_IOC_SHUTDOWN:
1189         case FS_IOC_GETFSMAP:
1190                 break;
1191         default:
1192                 return -ENOIOCTLCMD;
1193         }
1194         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1195 }
1196 #endif