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
  67         ei1 = EXT4_I(inode1);
  68         ei2 = EXT4_I(inode2);
  69
  70         swap(inode1->i_version, inode2->i_version);
  71         swap(inode1->i_blocks, inode2->i_blocks);
  72         swap(inode1->i_bytes, inode2->i_bytes);
  73         swap(inode1->i_atime, inode2->i_atime);
  74         swap(inode1->i_mtime, inode2->i_mtime);
  75
  76         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  77         swap(ei1->i_flags, ei2->i_flags);
  78         swap(ei1->i_disksize, ei2->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 static void reset_inode_seed(struct inode *inode)
  88 {
  89         struct ext4_inode_info *ei = EXT4_I(inode);
  90         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
  91         __le32 inum = cpu_to_le32(inode->i_ino);
  92         __le32 gen = cpu_to_le32(inode->i_generation);
  93         __u32 csum;
  94
  95         if (!ext4_has_metadata_csum(inode->i_sb))
  96                 return;
  97
  98         csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum));
  99         ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen));
 100 }
 101
 102 /**
 103  * Swap the information from the given @inode and the inode
 104  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
 105  * important fields of the inodes.
 106  *
 107  * @sb:         the super block of the filesystem
 108  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
 109  *
 110  */
 111 static long swap_inode_boot_loader(struct super_block *sb,
 112                                 struct inode *inode)
 113 {
 114         handle_t *handle;
 115         int err;
 116         struct inode *inode_bl;
 117         struct ext4_inode_info *ei_bl;
 118
 119         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 120             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 121             ext4_has_inline_data(inode))
 122                 return -EINVAL;
 123
 124         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 125             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 126                 return -EPERM;
 127
 128         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 129         if (IS_ERR(inode_bl))
 130                 return PTR_ERR(inode_bl);
 131         ei_bl = EXT4_I(inode_bl);
 132
 133         filemap_flush(inode->i_mapping);
 134         filemap_flush(inode_bl->i_mapping);
 135
 136         /* Protect orig inodes against a truncate and make sure,
 137          * that only 1 swap_inode_boot_loader is running. */
 138         lock_two_nondirectories(inode, inode_bl);
 139
 140         /* Wait for all existing dio workers */
 141         inode_dio_wait(inode);
 142         inode_dio_wait(inode_bl);
 143
 144         truncate_inode_pages(&inode->i_data, 0);
 145         truncate_inode_pages(&inode_bl->i_data, 0);
 146
 147         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 148         if (IS_ERR(handle)) {
 149                 err = -EINVAL;
 150                 goto journal_err_out;
 151         }
 152
 153         /* Protect extent tree against block allocations via delalloc */
 154         ext4_double_down_write_data_sem(inode, inode_bl);
 155
 156         if (inode_bl->i_nlink == 0) {
 157                 /* this inode has never been used as a BOOT_LOADER */
 158                 set_nlink(inode_bl, 1);
 159                 i_uid_write(inode_bl, 0);
 160                 i_gid_write(inode_bl, 0);
 161                 inode_bl->i_flags = 0;
 162                 ei_bl->i_flags = 0;
 163                 inode_set_iversion(inode_bl, 1);
 164                 i_size_write(inode_bl, 0);
 165                 inode_bl->i_mode = S_IFREG;
 166                 if (ext4_has_feature_extents(sb)) {
 167                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 168                         ext4_ext_tree_init(handle, inode_bl);
 169                 } else
 170                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 171         }
 172
 173         swap_inode_data(inode, inode_bl);
 174
 175         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 176
 177         inode->i_generation = prandom_u32();
 178         inode_bl->i_generation = prandom_u32();
 179         reset_inode_seed(inode);
 180         reset_inode_seed(inode_bl);
 181
 182         ext4_discard_preallocations(inode);
 183
 184         err = ext4_mark_inode_dirty(handle, inode);
 185         if (err < 0) {
 186                 ext4_warning(inode->i_sb,
 187                         "couldn't mark inode #%lu dirty (err %d)",
 188                         inode->i_ino, err);
 189                 /* Revert all changes: */
 190                 swap_inode_data(inode, inode_bl);
 191                 ext4_mark_inode_dirty(handle, inode);
 192         } else {
 193                 err = ext4_mark_inode_dirty(handle, inode_bl);
 194                 if (err < 0) {
 195                         ext4_warning(inode_bl->i_sb,
 196                                 "couldn't mark inode #%lu dirty (err %d)",
 197                                 inode_bl->i_ino, err);
 198                         /* Revert all changes: */
 199                         swap_inode_data(inode, inode_bl);
 200                         ext4_mark_inode_dirty(handle, inode);
 201                         ext4_mark_inode_dirty(handle, inode_bl);
 202                 }
 203         }
 204         ext4_journal_stop(handle);
 205         ext4_double_up_write_data_sem(inode, inode_bl);
 206
 207 journal_err_out:
 208         unlock_two_nondirectories(inode, inode_bl);
 209         iput(inode_bl);
 210         return err;
 211 }
 212
 213 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 214 static int uuid_is_zero(__u8 u[16])
 215 {
 216         int     i;
 217
 218         for (i = 0; i < 16; i++)
 219                 if (u[i])
 220                         return 0;
 221         return 1;
 222 }
 223 #endif
 224
 225 static int ext4_ioctl_setflags(struct inode *inode,
 226                                unsigned int flags)
 227 {
 228         struct ext4_inode_info *ei = EXT4_I(inode);
 229         handle_t *handle = NULL;
 230         int err = -EPERM, migrate = 0;
 231         struct ext4_iloc iloc;
 232         unsigned int oldflags, mask, i;
 233         unsigned int jflag;
 234
 235         /* Is it quota file? Do not allow user to mess with it */
 236         if (ext4_is_quota_file(inode))
 237                 goto flags_out;
 238
 239         oldflags = ei->i_flags;
 240
 241         /* The JOURNAL_DATA flag is modifiable only by root */
 242         jflag = flags & EXT4_JOURNAL_DATA_FL;
 243
 244         /*
 245          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 246          * the relevant capability.
 247          *
 248          * This test looks nicer. Thanks to Pauline Middelink
 249          */
 250         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 251                 if (!capable(CAP_LINUX_IMMUTABLE))
 252                         goto flags_out;
 253         }
 254
 255         /*
 256          * The JOURNAL_DATA flag can only be changed by
 257          * the relevant capability.
 258          */
 259         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 260                 if (!capable(CAP_SYS_RESOURCE))
 261                         goto flags_out;
 262         }
 263         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 264                 migrate = 1;
 265
 266         if (flags & EXT4_EOFBLOCKS_FL) {
 267                 /* we don't support adding EOFBLOCKS flag */
 268                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 269                         err = -EOPNOTSUPP;
 270                         goto flags_out;
 271                 }
 272         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 273                 err = ext4_truncate(inode);
 274                 if (err)
 275                         goto flags_out;
 276         }
 277
 278         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 279         if (IS_ERR(handle)) {
 280                 err = PTR_ERR(handle);
 281                 goto flags_out;
 282         }
 283         if (IS_SYNC(inode))
 284                 ext4_handle_sync(handle);
 285         err = ext4_reserve_inode_write(handle, inode, &iloc);
 286         if (err)
 287                 goto flags_err;
 288
 289         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 290                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 291                         continue;
 292                 /* These flags get special treatment later */
 293                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 294                         continue;
 295                 if (mask & flags)
 296                         ext4_set_inode_flag(inode, i);
 297                 else
 298                         ext4_clear_inode_flag(inode, i);
 299         }
 300
 301         ext4_set_inode_flags(inode);
 302         inode->i_ctime = current_time(inode);
 303
 304         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 305 flags_err:
 306         ext4_journal_stop(handle);
 307         if (err)
 308                 goto flags_out;
 309
 310         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 311                 /*
 312                  * Changes to the journaling mode can cause unsafe changes to
 313                  * S_DAX if we are using the DAX mount option.
 314                  */
 315                 if (test_opt(inode->i_sb, DAX)) {
 316                         err = -EBUSY;
 317                         goto flags_out;
 318                 }
 319
 320                 err = ext4_change_inode_journal_flag(inode, jflag);
 321                 if (err)
 322                         goto flags_out;
 323         }
 324         if (migrate) {
 325                 if (flags & EXT4_EXTENTS_FL)
 326                         err = ext4_ext_migrate(inode);
 327                 else
 328                         err = ext4_ind_migrate(inode);
 329         }
 330
 331 flags_out:
 332         return err;
 333 }
 334
 335 #ifdef CONFIG_QUOTA
 336 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 337 {
 338         struct inode *inode = file_inode(filp);
 339         struct super_block *sb = inode->i_sb;
 340         struct ext4_inode_info *ei = EXT4_I(inode);
 341         int err, rc;
 342         handle_t *handle;
 343         kprojid_t kprojid;
 344         struct ext4_iloc iloc;
 345         struct ext4_inode *raw_inode;
 346         struct dquot *transfer_to[MAXQUOTAS] = { };
 347
 348         if (!ext4_has_feature_project(sb)) {
 349                 if (projid != EXT4_DEF_PROJID)
 350                         return -EOPNOTSUPP;
 351                 else
 352                         return 0;
 353         }
 354
 355         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 356                 return -EOPNOTSUPP;
 357
 358         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 359
 360         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 361                 return 0;
 362
 363         err = -EPERM;
 364         /* Is it quota file? Do not allow user to mess with it */
 365         if (ext4_is_quota_file(inode))
 366                 return err;
 367
 368         err = ext4_get_inode_loc(inode, &iloc);
 369         if (err)
 370                 return err;
 371
 372         raw_inode = ext4_raw_inode(&iloc);
 373         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 374                 err = ext4_expand_extra_isize(inode,
 375                                               EXT4_SB(sb)->s_want_extra_isize,
 376                                               &iloc);
 377                 if (err)
 378                         return err;
 379         } else {
 380                 brelse(iloc.bh);
 381         }
 382
 383         err = dquot_initialize(inode);
 384         if (err)
 385                 return err;
 386
 387         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 388                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 389                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 390         if (IS_ERR(handle))
 391                 return PTR_ERR(handle);
 392
 393         err = ext4_reserve_inode_write(handle, inode, &iloc);
 394         if (err)
 395                 goto out_stop;
 396
 397         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 398         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 399
 400                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 401                  * counts xattr inode references.
 402                  */
 403                 down_read(&EXT4_I(inode)->xattr_sem);
 404                 err = __dquot_transfer(inode, transfer_to);
 405                 up_read(&EXT4_I(inode)->xattr_sem);
 406                 dqput(transfer_to[PRJQUOTA]);
 407                 if (err)
 408                         goto out_dirty;
 409         }
 410
 411         EXT4_I(inode)->i_projid = kprojid;
 412         inode->i_ctime = current_time(inode);
 413 out_dirty:
 414         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 415         if (!err)
 416                 err = rc;
 417 out_stop:
 418         ext4_journal_stop(handle);
 419         return err;
 420 }
 421 #else
 422 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 423 {
 424         if (projid != EXT4_DEF_PROJID)
 425                 return -EOPNOTSUPP;
 426         return 0;
 427 }
 428 #endif
 429
 430 /* Transfer internal flags to xflags */
 431 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 432 {
 433         __u32 xflags = 0;
 434
 435         if (iflags & EXT4_SYNC_FL)
 436                 xflags |= FS_XFLAG_SYNC;
 437         if (iflags & EXT4_IMMUTABLE_FL)
 438                 xflags |= FS_XFLAG_IMMUTABLE;
 439         if (iflags & EXT4_APPEND_FL)
 440                 xflags |= FS_XFLAG_APPEND;
 441         if (iflags & EXT4_NODUMP_FL)
 442                 xflags |= FS_XFLAG_NODUMP;
 443         if (iflags & EXT4_NOATIME_FL)
 444                 xflags |= FS_XFLAG_NOATIME;
 445         if (iflags & EXT4_PROJINHERIT_FL)
 446                 xflags |= FS_XFLAG_PROJINHERIT;
 447         return xflags;
 448 }
 449
 450 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 451                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 452                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 453
 454 /* Transfer xflags flags to internal */
 455 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 456 {
 457         unsigned long iflags = 0;
 458
 459         if (xflags & FS_XFLAG_SYNC)
 460                 iflags |= EXT4_SYNC_FL;
 461         if (xflags & FS_XFLAG_IMMUTABLE)
 462                 iflags |= EXT4_IMMUTABLE_FL;
 463         if (xflags & FS_XFLAG_APPEND)
 464                 iflags |= EXT4_APPEND_FL;
 465         if (xflags & FS_XFLAG_NODUMP)
 466                 iflags |= EXT4_NODUMP_FL;
 467         if (xflags & FS_XFLAG_NOATIME)
 468                 iflags |= EXT4_NOATIME_FL;
 469         if (xflags & FS_XFLAG_PROJINHERIT)
 470                 iflags |= EXT4_PROJINHERIT_FL;
 471
 472         return iflags;
 473 }
 474
 475 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 476 {
 477         struct ext4_sb_info *sbi = EXT4_SB(sb);
 478         __u32 flags;
 479
 480         if (!capable(CAP_SYS_ADMIN))
 481                 return -EPERM;
 482
 483         if (get_user(flags, (__u32 __user *)arg))
 484                 return -EFAULT;
 485
 486         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 487                 return -EINVAL;
 488
 489         if (ext4_forced_shutdown(sbi))
 490                 return 0;
 491
 492         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 493         trace_ext4_shutdown(sb, flags);
 494
 495         switch (flags) {
 496         case EXT4_GOING_FLAGS_DEFAULT:
 497                 freeze_bdev(sb->s_bdev);
 498                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 499                 thaw_bdev(sb->s_bdev, sb);
 500                 break;
 501         case EXT4_GOING_FLAGS_LOGFLUSH:
 502                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 503                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 504                         (void) ext4_force_commit(sb);
 505                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 506                 }
 507                 break;
 508         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 509                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 510                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 511                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 512                 break;
 513         default:
 514                 return -EINVAL;
 515         }
 516         clear_opt(sb, DISCARD);
 517         return 0;
 518 }
 519
 520 struct getfsmap_info {
 521         struct super_block      *gi_sb;
 522         struct fsmap_head __user *gi_data;
 523         unsigned int            gi_idx;
 524         __u32                   gi_last_flags;
 525 };
 526
 527 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 528 {
 529         struct getfsmap_info *info = priv;
 530         struct fsmap fm;
 531
 532         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 533
 534         info->gi_last_flags = xfm->fmr_flags;
 535         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 536         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 537                         sizeof(struct fsmap)))
 538                 return -EFAULT;
 539
 540         return 0;
 541 }
 542
 543 static int ext4_ioc_getfsmap(struct super_block *sb,
 544                              struct fsmap_head __user *arg)
 545 {
 546         struct getfsmap_info info = {0};
 547         struct ext4_fsmap_head xhead = {0};
 548         struct fsmap_head head;
 549         bool aborted = false;
 550         int error;
 551
 552         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 553                 return -EFAULT;
 554         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 555             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 556                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 557             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 558                        sizeof(head.fmh_keys[1].fmr_reserved)))
 559                 return -EINVAL;
 560         /*
 561          * ext4 doesn't report file extents at all, so the only valid
 562          * file offsets are the magic ones (all zeroes or all ones).
 563          */
 564         if (head.fmh_keys[0].fmr_offset ||
 565             (head.fmh_keys[1].fmr_offset != 0 &&
 566              head.fmh_keys[1].fmr_offset != -1ULL))
 567                 return -EINVAL;
 568
 569         xhead.fmh_iflags = head.fmh_iflags;
 570         xhead.fmh_count = head.fmh_count;
 571         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 572         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 573
 574         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 575         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 576
 577         info.gi_sb = sb;
 578         info.gi_data = arg;
 579         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 580         if (error == EXT4_QUERY_RANGE_ABORT) {
 581                 error = 0;
 582                 aborted = true;
 583         } else if (error)
 584                 return error;
 585
 586         /* If we didn't abort, set the "last" flag in the last fmx */
 587         if (!aborted && info.gi_idx) {
 588                 info.gi_last_flags |= FMR_OF_LAST;
 589                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 590                                  &info.gi_last_flags,
 591                                  sizeof(info.gi_last_flags)))
 592                         return -EFAULT;
 593         }
 594
 595         /* copy back header */
 596         head.fmh_entries = xhead.fmh_entries;
 597         head.fmh_oflags = xhead.fmh_oflags;
 598         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 599                 return -EFAULT;
 600
 601         return 0;
 602 }
 603
 604 static long ext4_ioctl_group_add(struct file *file,
 605                                  struct ext4_new_group_data *input)
 606 {
 607         struct super_block *sb = file_inode(file)->i_sb;
 608         int err, err2=0;
 609
 610         err = ext4_resize_begin(sb);
 611         if (err)
 612                 return err;
 613
 614         if (ext4_has_feature_bigalloc(sb)) {
 615                 ext4_msg(sb, KERN_ERR,
 616                          "Online resizing not supported with bigalloc");
 617                 err = -EOPNOTSUPP;
 618                 goto group_add_out;
 619         }
 620
 621         err = mnt_want_write_file(file);
 622         if (err)
 623                 goto group_add_out;
 624
 625         err = ext4_group_add(sb, input);
 626         if (EXT4_SB(sb)->s_journal) {
 627                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 628                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 629                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 630         }
 631         if (err == 0)
 632                 err = err2;
 633         mnt_drop_write_file(file);
 634         if (!err && ext4_has_group_desc_csum(sb) &&
 635             test_opt(sb, INIT_INODE_TABLE))
 636                 err = ext4_register_li_request(sb, input->group);
 637 group_add_out:
 638         ext4_resize_end(sb);
 639         return err;
 640 }
 641
 642 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 643 {
 644         /*
 645          * Project Quota ID state is only allowed to change from within the init
 646          * namespace. Enforce that restriction only if we are trying to change
 647          * the quota ID state. Everything else is allowed in user namespaces.
 648          */
 649         if (current_user_ns() == &init_user_ns)
 650                 return 0;
 651
 652         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 653                 return -EINVAL;
 654
 655         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 656                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 657                         return -EINVAL;
 658         } else {
 659                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 660                         return -EINVAL;
 661         }
 662
 663         return 0;
 664 }
 665
 666 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 667 {
 668         struct inode *inode = file_inode(filp);
 669         struct super_block *sb = inode->i_sb;
 670         struct ext4_inode_info *ei = EXT4_I(inode);
 671         unsigned int flags;
 672
 673         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 674
 675         switch (cmd) {
 676         case FS_IOC_GETFSMAP:
 677                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 678         case EXT4_IOC_GETFLAGS:
 679                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 680                 return put_user(flags, (int __user *) arg);
 681         case EXT4_IOC_SETFLAGS: {
 682                 int err;
 683
 684                 if (!inode_owner_or_capable(inode))
 685                         return -EACCES;
 686
 687                 if (get_user(flags, (int __user *) arg))
 688                         return -EFAULT;
 689
 690                 if (flags & ~EXT4_FL_USER_VISIBLE)
 691                         return -EOPNOTSUPP;
 692                 /*
 693                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 694                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 695                  * more restrictive than just silently masking off visible but
 696                  * not settable flags as we always did.
 697                  */
 698                 flags &= EXT4_FL_USER_MODIFIABLE;
 699                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 700                         return -EOPNOTSUPP;
 701
 702                 err = mnt_want_write_file(filp);
 703                 if (err)
 704                         return err;
 705
 706                 inode_lock(inode);
 707                 err = ext4_ioctl_setflags(inode, flags);
 708                 inode_unlock(inode);
 709                 mnt_drop_write_file(filp);
 710                 return err;
 711         }
 712         case EXT4_IOC_GETVERSION:
 713         case EXT4_IOC_GETVERSION_OLD:
 714                 return put_user(inode->i_generation, (int __user *) arg);
 715         case EXT4_IOC_SETVERSION:
 716         case EXT4_IOC_SETVERSION_OLD: {
 717                 handle_t *handle;
 718                 struct ext4_iloc iloc;
 719                 __u32 generation;
 720                 int err;
 721
 722                 if (!inode_owner_or_capable(inode))
 723                         return -EPERM;
 724
 725                 if (ext4_has_metadata_csum(inode->i_sb)) {
 726                         ext4_warning(sb, "Setting inode version is not "
 727                                      "supported with metadata_csum enabled.");
 728                         return -ENOTTY;
 729                 }
 730
 731                 err = mnt_want_write_file(filp);
 732                 if (err)
 733                         return err;
 734                 if (get_user(generation, (int __user *) arg)) {
 735                         err = -EFAULT;
 736                         goto setversion_out;
 737                 }
 738
 739                 inode_lock(inode);
 740                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 741                 if (IS_ERR(handle)) {
 742                         err = PTR_ERR(handle);
 743                         goto unlock_out;
 744                 }
 745                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 746                 if (err == 0) {
 747                         inode->i_ctime = current_time(inode);
 748                         inode->i_generation = generation;
 749                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 750                 }
 751                 ext4_journal_stop(handle);
 752
 753 unlock_out:
 754                 inode_unlock(inode);
 755 setversion_out:
 756                 mnt_drop_write_file(filp);
 757                 return err;
 758         }
 759         case EXT4_IOC_GROUP_EXTEND: {
 760                 ext4_fsblk_t n_blocks_count;
 761                 int err, err2=0;
 762
 763                 err = ext4_resize_begin(sb);
 764                 if (err)
 765                         return err;
 766
 767                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 768                         err = -EFAULT;
 769                         goto group_extend_out;
 770                 }
 771
 772                 if (ext4_has_feature_bigalloc(sb)) {
 773                         ext4_msg(sb, KERN_ERR,
 774                                  "Online resizing not supported with bigalloc");
 775                         err = -EOPNOTSUPP;
 776                         goto group_extend_out;
 777                 }
 778
 779                 err = mnt_want_write_file(filp);
 780                 if (err)
 781                         goto group_extend_out;
 782
 783                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 784                 if (EXT4_SB(sb)->s_journal) {
 785                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 786                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 787                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 788                 }
 789                 if (err == 0)
 790                         err = err2;
 791                 mnt_drop_write_file(filp);
 792 group_extend_out:
 793                 ext4_resize_end(sb);
 794                 return err;
 795         }
 796
 797         case EXT4_IOC_MOVE_EXT: {
 798                 struct move_extent me;
 799                 struct fd donor;
 800                 int err;
 801
 802                 if (!(filp->f_mode & FMODE_READ) ||
 803                     !(filp->f_mode & FMODE_WRITE))
 804                         return -EBADF;
 805
 806                 if (copy_from_user(&me,
 807                         (struct move_extent __user *)arg, sizeof(me)))
 808                         return -EFAULT;
 809                 me.moved_len = 0;
 810
 811                 donor = fdget(me.donor_fd);
 812                 if (!donor.file)
 813                         return -EBADF;
 814
 815                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 816                         err = -EBADF;
 817                         goto mext_out;
 818                 }
 819
 820                 if (ext4_has_feature_bigalloc(sb)) {
 821                         ext4_msg(sb, KERN_ERR,
 822                                  "Online defrag not supported with bigalloc");
 823                         err = -EOPNOTSUPP;
 824                         goto mext_out;
 825                 } else if (IS_DAX(inode)) {
 826                         ext4_msg(sb, KERN_ERR,
 827                                  "Online defrag not supported with DAX");
 828                         err = -EOPNOTSUPP;
 829                         goto mext_out;
 830                 }
 831
 832                 err = mnt_want_write_file(filp);
 833                 if (err)
 834                         goto mext_out;
 835
 836                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 837                                         me.donor_start, me.len, &me.moved_len);
 838                 mnt_drop_write_file(filp);
 839
 840                 if (copy_to_user((struct move_extent __user *)arg,
 841                                  &me, sizeof(me)))
 842                         err = -EFAULT;
 843 mext_out:
 844                 fdput(donor);
 845                 return err;
 846         }
 847
 848         case EXT4_IOC_GROUP_ADD: {
 849                 struct ext4_new_group_data input;
 850
 851                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 852                                 sizeof(input)))
 853                         return -EFAULT;
 854
 855                 return ext4_ioctl_group_add(filp, &input);
 856         }
 857
 858         case EXT4_IOC_MIGRATE:
 859         {
 860                 int err;
 861                 if (!inode_owner_or_capable(inode))
 862                         return -EACCES;
 863
 864                 err = mnt_want_write_file(filp);
 865                 if (err)
 866                         return err;
 867                 /*
 868                  * inode_mutex prevent write and truncate on the file.
 869                  * Read still goes through. We take i_data_sem in
 870                  * ext4_ext_swap_inode_data before we switch the
 871                  * inode format to prevent read.
 872                  */
 873                 inode_lock((inode));
 874                 err = ext4_ext_migrate(inode);
 875                 inode_unlock((inode));
 876                 mnt_drop_write_file(filp);
 877                 return err;
 878         }
 879
 880         case EXT4_IOC_ALLOC_DA_BLKS:
 881         {
 882                 int err;
 883                 if (!inode_owner_or_capable(inode))
 884                         return -EACCES;
 885
 886                 err = mnt_want_write_file(filp);
 887                 if (err)
 888                         return err;
 889                 err = ext4_alloc_da_blocks(inode);
 890                 mnt_drop_write_file(filp);
 891                 return err;
 892         }
 893
 894         case EXT4_IOC_SWAP_BOOT:
 895         {
 896                 int err;
 897                 if (!(filp->f_mode & FMODE_WRITE))
 898                         return -EBADF;
 899                 err = mnt_want_write_file(filp);
 900                 if (err)
 901                         return err;
 902                 err = swap_inode_boot_loader(sb, inode);
 903                 mnt_drop_write_file(filp);
 904                 return err;
 905         }
 906
 907         case EXT4_IOC_RESIZE_FS: {
 908                 ext4_fsblk_t n_blocks_count;
 909                 int err = 0, err2 = 0;
 910                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 911
 912                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 913                                    sizeof(__u64))) {
 914                         return -EFAULT;
 915                 }
 916
 917                 err = ext4_resize_begin(sb);
 918                 if (err)
 919                         return err;
 920
 921                 err = mnt_want_write_file(filp);
 922                 if (err)
 923                         goto resizefs_out;
 924
 925                 err = ext4_resize_fs(sb, n_blocks_count);
 926                 if (EXT4_SB(sb)->s_journal) {
 927                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 928                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 929                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 930                 }
 931                 if (err == 0)
 932                         err = err2;
 933                 mnt_drop_write_file(filp);
 934                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 935                     ext4_has_group_desc_csum(sb) &&
 936                     test_opt(sb, INIT_INODE_TABLE))
 937                         err = ext4_register_li_request(sb, o_group);
 938
 939 resizefs_out:
 940                 ext4_resize_end(sb);
 941                 return err;
 942         }
 943
 944         case FITRIM:
 945         {
 946                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 947                 struct fstrim_range range;
 948                 int ret = 0;
 949
 950                 if (!capable(CAP_SYS_ADMIN))
 951                         return -EPERM;
 952
 953                 if (!blk_queue_discard(q))
 954                         return -EOPNOTSUPP;
 955
 956                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 957                     sizeof(range)))
 958                         return -EFAULT;
 959
 960                 range.minlen = max((unsigned int)range.minlen,
 961                                    q->limits.discard_granularity);
 962                 ret = ext4_trim_fs(sb, &range);
 963                 if (ret < 0)
 964                         return ret;
 965
 966                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 967                     sizeof(range)))
 968                         return -EFAULT;
 969
 970                 return 0;
 971         }
 972         case EXT4_IOC_PRECACHE_EXTENTS:
 973                 return ext4_ext_precache(inode);
 974
 975         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 976                 if (!ext4_has_feature_encrypt(sb))
 977                         return -EOPNOTSUPP;
 978                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 979
 980         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 981 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 982                 int err, err2;
 983                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 984                 handle_t *handle;
 985
 986                 if (!ext4_has_feature_encrypt(sb))
 987                         return -EOPNOTSUPP;
 988                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 989                         err = mnt_want_write_file(filp);
 990                         if (err)
 991                                 return err;
 992                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 993                         if (IS_ERR(handle)) {
 994                                 err = PTR_ERR(handle);
 995                                 goto pwsalt_err_exit;
 996                         }
 997                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 998                         if (err)
 999                                 goto pwsalt_err_journal;
1000                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1001                         err = ext4_handle_dirty_metadata(handle, NULL,
1002                                                          sbi->s_sbh);
1003                 pwsalt_err_journal:
1004                         err2 = ext4_journal_stop(handle);
1005                         if (err2 && !err)
1006                                 err = err2;
1007                 pwsalt_err_exit:
1008                         mnt_drop_write_file(filp);
1009                         if (err)
1010                                 return err;
1011                 }
1012                 if (copy_to_user((void __user *) arg,
1013                                  sbi->s_es->s_encrypt_pw_salt, 16))
1014                         return -EFAULT;
1015                 return 0;
1016 #else
1017                 return -EOPNOTSUPP;
1018 #endif
1019         }
1020         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1021                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1022
1023         case EXT4_IOC_FSGETXATTR:
1024         {
1025                 struct fsxattr fa;
1026
1027                 memset(&fa, 0, sizeof(struct fsxattr));
1028                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1029
1030                 if (ext4_has_feature_project(inode->i_sb)) {
1031                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1032                                 EXT4_I(inode)->i_projid);
1033                 }
1034
1035                 if (copy_to_user((struct fsxattr __user *)arg,
1036                                  &fa, sizeof(fa)))
1037                         return -EFAULT;
1038                 return 0;
1039         }
1040         case EXT4_IOC_FSSETXATTR:
1041         {
1042                 struct fsxattr fa;
1043                 int err;
1044
1045                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1046                                    sizeof(fa)))
1047                         return -EFAULT;
1048
1049                 /* Make sure caller has proper permission */
1050                 if (!inode_owner_or_capable(inode))
1051                         return -EACCES;
1052
1053                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1054                         return -EOPNOTSUPP;
1055
1056                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1057                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1058                         return -EOPNOTSUPP;
1059
1060                 err = mnt_want_write_file(filp);
1061                 if (err)
1062                         return err;
1063
1064                 inode_lock(inode);
1065                 err = ext4_ioctl_check_project(inode, &fa);
1066                 if (err)
1067                         goto out;
1068                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1069                          (flags & EXT4_FL_XFLAG_VISIBLE);
1070                 err = ext4_ioctl_setflags(inode, flags);
1071                 if (err)
1072                         goto out;
1073                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1074 out:
1075                 inode_unlock(inode);
1076                 mnt_drop_write_file(filp);
1077                 return err;
1078         }
1079         case EXT4_IOC_SHUTDOWN:
1080                 return ext4_shutdown(sb, arg);
1081         default:
1082                 return -ENOTTY;
1083         }
1084 }
1085
1086 #ifdef CONFIG_COMPAT
1087 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1088 {
1089         /* These are just misnamed, they actually get/put from/to user an int */
1090         switch (cmd) {
1091         case EXT4_IOC32_GETFLAGS:
1092                 cmd = EXT4_IOC_GETFLAGS;
1093                 break;
1094         case EXT4_IOC32_SETFLAGS:
1095                 cmd = EXT4_IOC_SETFLAGS;
1096                 break;
1097         case EXT4_IOC32_GETVERSION:
1098                 cmd = EXT4_IOC_GETVERSION;
1099                 break;
1100         case EXT4_IOC32_SETVERSION:
1101                 cmd = EXT4_IOC_SETVERSION;
1102                 break;
1103         case EXT4_IOC32_GROUP_EXTEND:
1104                 cmd = EXT4_IOC_GROUP_EXTEND;
1105                 break;
1106         case EXT4_IOC32_GETVERSION_OLD:
1107                 cmd = EXT4_IOC_GETVERSION_OLD;
1108                 break;
1109         case EXT4_IOC32_SETVERSION_OLD:
1110                 cmd = EXT4_IOC_SETVERSION_OLD;
1111                 break;
1112         case EXT4_IOC32_GETRSVSZ:
1113                 cmd = EXT4_IOC_GETRSVSZ;
1114                 break;
1115         case EXT4_IOC32_SETRSVSZ:
1116                 cmd = EXT4_IOC_SETRSVSZ;
1117                 break;
1118         case EXT4_IOC32_GROUP_ADD: {
1119                 struct compat_ext4_new_group_input __user *uinput;
1120                 struct ext4_new_group_data input;
1121                 int err;
1122
1123                 uinput = compat_ptr(arg);
1124                 err = get_user(input.group, &uinput->group);
1125                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1126                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1127                 err |= get_user(input.inode_table, &uinput->inode_table);
1128                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1129                 err |= get_user(input.reserved_blocks,
1130                                 &uinput->reserved_blocks);
1131                 if (err)
1132                         return -EFAULT;
1133                 return ext4_ioctl_group_add(file, &input);
1134         }
1135         case EXT4_IOC_MOVE_EXT:
1136         case EXT4_IOC_RESIZE_FS:
1137         case EXT4_IOC_PRECACHE_EXTENTS:
1138         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1139         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1140         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1141         case EXT4_IOC_SHUTDOWN:
1142         case FS_IOC_GETFSMAP:
1143                 break;
1144         default:
1145                 return -ENOIOCTLCMD;
1146         }
1147         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1148 }
1149 #endif