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         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 120         if (IS_ERR(inode_bl))
 121                 return PTR_ERR(inode_bl);
 122         ei_bl = EXT4_I(inode_bl);
 123
 124         filemap_flush(inode->i_mapping);
 125         filemap_flush(inode_bl->i_mapping);
 126
 127         /* Protect orig inodes against a truncate and make sure,
 128          * that only 1 swap_inode_boot_loader is running. */
 129         lock_two_nondirectories(inode, inode_bl);
 130
 131         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) ||
 132             IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) ||
 133             ext4_has_inline_data(inode)) {
 134                 err = -EINVAL;
 135                 goto journal_err_out;
 136         }
 137
 138         if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) ||
 139             !inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) {
 140                 err = -EPERM;
 141                 goto journal_err_out;
 142         }
 143
 144         /* Wait for all existing dio workers */
 145         inode_dio_wait(inode);
 146         inode_dio_wait(inode_bl);
 147
 148         truncate_inode_pages(&inode->i_data, 0);
 149         truncate_inode_pages(&inode_bl->i_data, 0);
 150
 151         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 152         if (IS_ERR(handle)) {
 153                 err = -EINVAL;
 154                 goto journal_err_out;
 155         }
 156
 157         /* Protect extent tree against block allocations via delalloc */
 158         ext4_double_down_write_data_sem(inode, inode_bl);
 159
 160         if (inode_bl->i_nlink == 0) {
 161                 /* this inode has never been used as a BOOT_LOADER */
 162                 set_nlink(inode_bl, 1);
 163                 i_uid_write(inode_bl, 0);
 164                 i_gid_write(inode_bl, 0);
 165                 inode_bl->i_flags = 0;
 166                 ei_bl->i_flags = 0;
 167                 inode_set_iversion(inode_bl, 1);
 168                 i_size_write(inode_bl, 0);
 169                 inode_bl->i_mode = S_IFREG;
 170                 if (ext4_has_feature_extents(sb)) {
 171                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 172                         ext4_ext_tree_init(handle, inode_bl);
 173                 } else
 174                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 175         }
 176
 177         swap_inode_data(inode, inode_bl);
 178
 179         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 180
 181         inode->i_generation = prandom_u32();
 182         inode_bl->i_generation = prandom_u32();
 183         reset_inode_seed(inode);
 184         reset_inode_seed(inode_bl);
 185
 186         ext4_discard_preallocations(inode);
 187
 188         err = ext4_mark_inode_dirty(handle, inode);
 189         if (err < 0) {
 190                 ext4_warning(inode->i_sb,
 191                         "couldn't mark inode #%lu dirty (err %d)",
 192                         inode->i_ino, err);
 193                 /* Revert all changes: */
 194                 swap_inode_data(inode, inode_bl);
 195                 ext4_mark_inode_dirty(handle, inode);
 196         } else {
 197                 err = ext4_mark_inode_dirty(handle, inode_bl);
 198                 if (err < 0) {
 199                         ext4_warning(inode_bl->i_sb,
 200                                 "couldn't mark inode #%lu dirty (err %d)",
 201                                 inode_bl->i_ino, err);
 202                         /* Revert all changes: */
 203                         swap_inode_data(inode, inode_bl);
 204                         ext4_mark_inode_dirty(handle, inode);
 205                         ext4_mark_inode_dirty(handle, inode_bl);
 206                 }
 207         }
 208         ext4_journal_stop(handle);
 209         ext4_double_up_write_data_sem(inode, inode_bl);
 210
 211 journal_err_out:
 212         unlock_two_nondirectories(inode, inode_bl);
 213         iput(inode_bl);
 214         return err;
 215 }
 216
 217 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 218 static int uuid_is_zero(__u8 u[16])
 219 {
 220         int     i;
 221
 222         for (i = 0; i < 16; i++)
 223                 if (u[i])
 224                         return 0;
 225         return 1;
 226 }
 227 #endif
 228
 229 static int ext4_ioctl_setflags(struct inode *inode,
 230                                unsigned int flags)
 231 {
 232         struct ext4_inode_info *ei = EXT4_I(inode);
 233         handle_t *handle = NULL;
 234         int err = -EPERM, migrate = 0;
 235         struct ext4_iloc iloc;
 236         unsigned int oldflags, mask, i;
 237         unsigned int jflag;
 238
 239         /* Is it quota file? Do not allow user to mess with it */
 240         if (ext4_is_quota_file(inode))
 241                 goto flags_out;
 242
 243         oldflags = ei->i_flags;
 244
 245         /* The JOURNAL_DATA flag is modifiable only by root */
 246         jflag = flags & EXT4_JOURNAL_DATA_FL;
 247
 248         /*
 249          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 250          * the relevant capability.
 251          *
 252          * This test looks nicer. Thanks to Pauline Middelink
 253          */
 254         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 255                 if (!capable(CAP_LINUX_IMMUTABLE))
 256                         goto flags_out;
 257         }
 258
 259         /*
 260          * The JOURNAL_DATA flag can only be changed by
 261          * the relevant capability.
 262          */
 263         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 264                 if (!capable(CAP_SYS_RESOURCE))
 265                         goto flags_out;
 266         }
 267         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 268                 migrate = 1;
 269
 270         if (flags & EXT4_EOFBLOCKS_FL) {
 271                 /* we don't support adding EOFBLOCKS flag */
 272                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 273                         err = -EOPNOTSUPP;
 274                         goto flags_out;
 275                 }
 276         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 277                 err = ext4_truncate(inode);
 278                 if (err)
 279                         goto flags_out;
 280         }
 281
 282         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 283         if (IS_ERR(handle)) {
 284                 err = PTR_ERR(handle);
 285                 goto flags_out;
 286         }
 287         if (IS_SYNC(inode))
 288                 ext4_handle_sync(handle);
 289         err = ext4_reserve_inode_write(handle, inode, &iloc);
 290         if (err)
 291                 goto flags_err;
 292
 293         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 294                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 295                         continue;
 296                 /* These flags get special treatment later */
 297                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 298                         continue;
 299                 if (mask & flags)
 300                         ext4_set_inode_flag(inode, i);
 301                 else
 302                         ext4_clear_inode_flag(inode, i);
 303         }
 304
 305         ext4_set_inode_flags(inode);
 306         inode->i_ctime = current_time(inode);
 307
 308         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 309 flags_err:
 310         ext4_journal_stop(handle);
 311         if (err)
 312                 goto flags_out;
 313
 314         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 315                 /*
 316                  * Changes to the journaling mode can cause unsafe changes to
 317                  * S_DAX if we are using the DAX mount option.
 318                  */
 319                 if (test_opt(inode->i_sb, DAX)) {
 320                         err = -EBUSY;
 321                         goto flags_out;
 322                 }
 323
 324                 err = ext4_change_inode_journal_flag(inode, jflag);
 325                 if (err)
 326                         goto flags_out;
 327         }
 328         if (migrate) {
 329                 if (flags & EXT4_EXTENTS_FL)
 330                         err = ext4_ext_migrate(inode);
 331                 else
 332                         err = ext4_ind_migrate(inode);
 333         }
 334
 335 flags_out:
 336         return err;
 337 }
 338
 339 #ifdef CONFIG_QUOTA
 340 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 341 {
 342         struct inode *inode = file_inode(filp);
 343         struct super_block *sb = inode->i_sb;
 344         struct ext4_inode_info *ei = EXT4_I(inode);
 345         int err, rc;
 346         handle_t *handle;
 347         kprojid_t kprojid;
 348         struct ext4_iloc iloc;
 349         struct ext4_inode *raw_inode;
 350         struct dquot *transfer_to[MAXQUOTAS] = { };
 351
 352         if (!ext4_has_feature_project(sb)) {
 353                 if (projid != EXT4_DEF_PROJID)
 354                         return -EOPNOTSUPP;
 355                 else
 356                         return 0;
 357         }
 358
 359         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 360                 return -EOPNOTSUPP;
 361
 362         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 363
 364         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 365                 return 0;
 366
 367         err = -EPERM;
 368         /* Is it quota file? Do not allow user to mess with it */
 369         if (ext4_is_quota_file(inode))
 370                 return err;
 371
 372         err = ext4_get_inode_loc(inode, &iloc);
 373         if (err)
 374                 return err;
 375
 376         raw_inode = ext4_raw_inode(&iloc);
 377         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 378                 err = ext4_expand_extra_isize(inode,
 379                                               EXT4_SB(sb)->s_want_extra_isize,
 380                                               &iloc);
 381                 if (err)
 382                         return err;
 383         } else {
 384                 brelse(iloc.bh);
 385         }
 386
 387         err = dquot_initialize(inode);
 388         if (err)
 389                 return err;
 390
 391         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 392                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 393                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 394         if (IS_ERR(handle))
 395                 return PTR_ERR(handle);
 396
 397         err = ext4_reserve_inode_write(handle, inode, &iloc);
 398         if (err)
 399                 goto out_stop;
 400
 401         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 402         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 403
 404                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 405                  * counts xattr inode references.
 406                  */
 407                 down_read(&EXT4_I(inode)->xattr_sem);
 408                 err = __dquot_transfer(inode, transfer_to);
 409                 up_read(&EXT4_I(inode)->xattr_sem);
 410                 dqput(transfer_to[PRJQUOTA]);
 411                 if (err)
 412                         goto out_dirty;
 413         }
 414
 415         EXT4_I(inode)->i_projid = kprojid;
 416         inode->i_ctime = current_time(inode);
 417 out_dirty:
 418         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 419         if (!err)
 420                 err = rc;
 421 out_stop:
 422         ext4_journal_stop(handle);
 423         return err;
 424 }
 425 #else
 426 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 427 {
 428         if (projid != EXT4_DEF_PROJID)
 429                 return -EOPNOTSUPP;
 430         return 0;
 431 }
 432 #endif
 433
 434 /* Transfer internal flags to xflags */
 435 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 436 {
 437         __u32 xflags = 0;
 438
 439         if (iflags & EXT4_SYNC_FL)
 440                 xflags |= FS_XFLAG_SYNC;
 441         if (iflags & EXT4_IMMUTABLE_FL)
 442                 xflags |= FS_XFLAG_IMMUTABLE;
 443         if (iflags & EXT4_APPEND_FL)
 444                 xflags |= FS_XFLAG_APPEND;
 445         if (iflags & EXT4_NODUMP_FL)
 446                 xflags |= FS_XFLAG_NODUMP;
 447         if (iflags & EXT4_NOATIME_FL)
 448                 xflags |= FS_XFLAG_NOATIME;
 449         if (iflags & EXT4_PROJINHERIT_FL)
 450                 xflags |= FS_XFLAG_PROJINHERIT;
 451         return xflags;
 452 }
 453
 454 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 455                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 456                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 457
 458 /* Transfer xflags flags to internal */
 459 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 460 {
 461         unsigned long iflags = 0;
 462
 463         if (xflags & FS_XFLAG_SYNC)
 464                 iflags |= EXT4_SYNC_FL;
 465         if (xflags & FS_XFLAG_IMMUTABLE)
 466                 iflags |= EXT4_IMMUTABLE_FL;
 467         if (xflags & FS_XFLAG_APPEND)
 468                 iflags |= EXT4_APPEND_FL;
 469         if (xflags & FS_XFLAG_NODUMP)
 470                 iflags |= EXT4_NODUMP_FL;
 471         if (xflags & FS_XFLAG_NOATIME)
 472                 iflags |= EXT4_NOATIME_FL;
 473         if (xflags & FS_XFLAG_PROJINHERIT)
 474                 iflags |= EXT4_PROJINHERIT_FL;
 475
 476         return iflags;
 477 }
 478
 479 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 480 {
 481         struct ext4_sb_info *sbi = EXT4_SB(sb);
 482         __u32 flags;
 483
 484         if (!capable(CAP_SYS_ADMIN))
 485                 return -EPERM;
 486
 487         if (get_user(flags, (__u32 __user *)arg))
 488                 return -EFAULT;
 489
 490         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 491                 return -EINVAL;
 492
 493         if (ext4_forced_shutdown(sbi))
 494                 return 0;
 495
 496         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 497         trace_ext4_shutdown(sb, flags);
 498
 499         switch (flags) {
 500         case EXT4_GOING_FLAGS_DEFAULT:
 501                 freeze_bdev(sb->s_bdev);
 502                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 503                 thaw_bdev(sb->s_bdev, sb);
 504                 break;
 505         case EXT4_GOING_FLAGS_LOGFLUSH:
 506                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 507                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 508                         (void) ext4_force_commit(sb);
 509                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 510                 }
 511                 break;
 512         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 513                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 514                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 515                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 516                 break;
 517         default:
 518                 return -EINVAL;
 519         }
 520         clear_opt(sb, DISCARD);
 521         return 0;
 522 }
 523
 524 struct getfsmap_info {
 525         struct super_block      *gi_sb;
 526         struct fsmap_head __user *gi_data;
 527         unsigned int            gi_idx;
 528         __u32                   gi_last_flags;
 529 };
 530
 531 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 532 {
 533         struct getfsmap_info *info = priv;
 534         struct fsmap fm;
 535
 536         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 537
 538         info->gi_last_flags = xfm->fmr_flags;
 539         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 540         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 541                         sizeof(struct fsmap)))
 542                 return -EFAULT;
 543
 544         return 0;
 545 }
 546
 547 static int ext4_ioc_getfsmap(struct super_block *sb,
 548                              struct fsmap_head __user *arg)
 549 {
 550         struct getfsmap_info info = {0};
 551         struct ext4_fsmap_head xhead = {0};
 552         struct fsmap_head head;
 553         bool aborted = false;
 554         int error;
 555
 556         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 557                 return -EFAULT;
 558         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 559             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 560                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 561             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 562                        sizeof(head.fmh_keys[1].fmr_reserved)))
 563                 return -EINVAL;
 564         /*
 565          * ext4 doesn't report file extents at all, so the only valid
 566          * file offsets are the magic ones (all zeroes or all ones).
 567          */
 568         if (head.fmh_keys[0].fmr_offset ||
 569             (head.fmh_keys[1].fmr_offset != 0 &&
 570              head.fmh_keys[1].fmr_offset != -1ULL))
 571                 return -EINVAL;
 572
 573         xhead.fmh_iflags = head.fmh_iflags;
 574         xhead.fmh_count = head.fmh_count;
 575         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 576         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 577
 578         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 579         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 580
 581         info.gi_sb = sb;
 582         info.gi_data = arg;
 583         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 584         if (error == EXT4_QUERY_RANGE_ABORT) {
 585                 error = 0;
 586                 aborted = true;
 587         } else if (error)
 588                 return error;
 589
 590         /* If we didn't abort, set the "last" flag in the last fmx */
 591         if (!aborted && info.gi_idx) {
 592                 info.gi_last_flags |= FMR_OF_LAST;
 593                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 594                                  &info.gi_last_flags,
 595                                  sizeof(info.gi_last_flags)))
 596                         return -EFAULT;
 597         }
 598
 599         /* copy back header */
 600         head.fmh_entries = xhead.fmh_entries;
 601         head.fmh_oflags = xhead.fmh_oflags;
 602         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 603                 return -EFAULT;
 604
 605         return 0;
 606 }
 607
 608 static long ext4_ioctl_group_add(struct file *file,
 609                                  struct ext4_new_group_data *input)
 610 {
 611         struct super_block *sb = file_inode(file)->i_sb;
 612         int err, err2=0;
 613
 614         err = ext4_resize_begin(sb);
 615         if (err)
 616                 return err;
 617
 618         if (ext4_has_feature_bigalloc(sb)) {
 619                 ext4_msg(sb, KERN_ERR,
 620                          "Online resizing not supported with bigalloc");
 621                 err = -EOPNOTSUPP;
 622                 goto group_add_out;
 623         }
 624
 625         err = mnt_want_write_file(file);
 626         if (err)
 627                 goto group_add_out;
 628
 629         err = ext4_group_add(sb, input);
 630         if (EXT4_SB(sb)->s_journal) {
 631                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 632                 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 633                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 634         }
 635         if (err == 0)
 636                 err = err2;
 637         mnt_drop_write_file(file);
 638         if (!err && ext4_has_group_desc_csum(sb) &&
 639             test_opt(sb, INIT_INODE_TABLE))
 640                 err = ext4_register_li_request(sb, input->group);
 641 group_add_out:
 642         ext4_resize_end(sb);
 643         return err;
 644 }
 645
 646 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 647 {
 648         /*
 649          * Project Quota ID state is only allowed to change from within the init
 650          * namespace. Enforce that restriction only if we are trying to change
 651          * the quota ID state. Everything else is allowed in user namespaces.
 652          */
 653         if (current_user_ns() == &init_user_ns)
 654                 return 0;
 655
 656         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 657                 return -EINVAL;
 658
 659         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 660                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 661                         return -EINVAL;
 662         } else {
 663                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 664                         return -EINVAL;
 665         }
 666
 667         return 0;
 668 }
 669
 670 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 671 {
 672         struct inode *inode = file_inode(filp);
 673         struct super_block *sb = inode->i_sb;
 674         struct ext4_inode_info *ei = EXT4_I(inode);
 675         unsigned int flags;
 676
 677         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 678
 679         switch (cmd) {
 680         case FS_IOC_GETFSMAP:
 681                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 682         case EXT4_IOC_GETFLAGS:
 683                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 684                 return put_user(flags, (int __user *) arg);
 685         case EXT4_IOC_SETFLAGS: {
 686                 int err;
 687
 688                 if (!inode_owner_or_capable(inode))
 689                         return -EACCES;
 690
 691                 if (get_user(flags, (int __user *) arg))
 692                         return -EFAULT;
 693
 694                 if (flags & ~EXT4_FL_USER_VISIBLE)
 695                         return -EOPNOTSUPP;
 696                 /*
 697                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 698                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 699                  * more restrictive than just silently masking off visible but
 700                  * not settable flags as we always did.
 701                  */
 702                 flags &= EXT4_FL_USER_MODIFIABLE;
 703                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 704                         return -EOPNOTSUPP;
 705
 706                 err = mnt_want_write_file(filp);
 707                 if (err)
 708                         return err;
 709
 710                 inode_lock(inode);
 711                 err = ext4_ioctl_setflags(inode, flags);
 712                 inode_unlock(inode);
 713                 mnt_drop_write_file(filp);
 714                 return err;
 715         }
 716         case EXT4_IOC_GETVERSION:
 717         case EXT4_IOC_GETVERSION_OLD:
 718                 return put_user(inode->i_generation, (int __user *) arg);
 719         case EXT4_IOC_SETVERSION:
 720         case EXT4_IOC_SETVERSION_OLD: {
 721                 handle_t *handle;
 722                 struct ext4_iloc iloc;
 723                 __u32 generation;
 724                 int err;
 725
 726                 if (!inode_owner_or_capable(inode))
 727                         return -EPERM;
 728
 729                 if (ext4_has_metadata_csum(inode->i_sb)) {
 730                         ext4_warning(sb, "Setting inode version is not "
 731                                      "supported with metadata_csum enabled.");
 732                         return -ENOTTY;
 733                 }
 734
 735                 err = mnt_want_write_file(filp);
 736                 if (err)
 737                         return err;
 738                 if (get_user(generation, (int __user *) arg)) {
 739                         err = -EFAULT;
 740                         goto setversion_out;
 741                 }
 742
 743                 inode_lock(inode);
 744                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 745                 if (IS_ERR(handle)) {
 746                         err = PTR_ERR(handle);
 747                         goto unlock_out;
 748                 }
 749                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 750                 if (err == 0) {
 751                         inode->i_ctime = current_time(inode);
 752                         inode->i_generation = generation;
 753                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 754                 }
 755                 ext4_journal_stop(handle);
 756
 757 unlock_out:
 758                 inode_unlock(inode);
 759 setversion_out:
 760                 mnt_drop_write_file(filp);
 761                 return err;
 762         }
 763         case EXT4_IOC_GROUP_EXTEND: {
 764                 ext4_fsblk_t n_blocks_count;
 765                 int err, err2=0;
 766
 767                 err = ext4_resize_begin(sb);
 768                 if (err)
 769                         return err;
 770
 771                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 772                         err = -EFAULT;
 773                         goto group_extend_out;
 774                 }
 775
 776                 if (ext4_has_feature_bigalloc(sb)) {
 777                         ext4_msg(sb, KERN_ERR,
 778                                  "Online resizing not supported with bigalloc");
 779                         err = -EOPNOTSUPP;
 780                         goto group_extend_out;
 781                 }
 782
 783                 err = mnt_want_write_file(filp);
 784                 if (err)
 785                         goto group_extend_out;
 786
 787                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 788                 if (EXT4_SB(sb)->s_journal) {
 789                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 790                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 791                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 792                 }
 793                 if (err == 0)
 794                         err = err2;
 795                 mnt_drop_write_file(filp);
 796 group_extend_out:
 797                 ext4_resize_end(sb);
 798                 return err;
 799         }
 800
 801         case EXT4_IOC_MOVE_EXT: {
 802                 struct move_extent me;
 803                 struct fd donor;
 804                 int err;
 805
 806                 if (!(filp->f_mode & FMODE_READ) ||
 807                     !(filp->f_mode & FMODE_WRITE))
 808                         return -EBADF;
 809
 810                 if (copy_from_user(&me,
 811                         (struct move_extent __user *)arg, sizeof(me)))
 812                         return -EFAULT;
 813                 me.moved_len = 0;
 814
 815                 donor = fdget(me.donor_fd);
 816                 if (!donor.file)
 817                         return -EBADF;
 818
 819                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 820                         err = -EBADF;
 821                         goto mext_out;
 822                 }
 823
 824                 if (ext4_has_feature_bigalloc(sb)) {
 825                         ext4_msg(sb, KERN_ERR,
 826                                  "Online defrag not supported with bigalloc");
 827                         err = -EOPNOTSUPP;
 828                         goto mext_out;
 829                 } else if (IS_DAX(inode)) {
 830                         ext4_msg(sb, KERN_ERR,
 831                                  "Online defrag not supported with DAX");
 832                         err = -EOPNOTSUPP;
 833                         goto mext_out;
 834                 }
 835
 836                 err = mnt_want_write_file(filp);
 837                 if (err)
 838                         goto mext_out;
 839
 840                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 841                                         me.donor_start, me.len, &me.moved_len);
 842                 mnt_drop_write_file(filp);
 843
 844                 if (copy_to_user((struct move_extent __user *)arg,
 845                                  &me, sizeof(me)))
 846                         err = -EFAULT;
 847 mext_out:
 848                 fdput(donor);
 849                 return err;
 850         }
 851
 852         case EXT4_IOC_GROUP_ADD: {
 853                 struct ext4_new_group_data input;
 854
 855                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 856                                 sizeof(input)))
 857                         return -EFAULT;
 858
 859                 return ext4_ioctl_group_add(filp, &input);
 860         }
 861
 862         case EXT4_IOC_MIGRATE:
 863         {
 864                 int err;
 865                 if (!inode_owner_or_capable(inode))
 866                         return -EACCES;
 867
 868                 err = mnt_want_write_file(filp);
 869                 if (err)
 870                         return err;
 871                 /*
 872                  * inode_mutex prevent write and truncate on the file.
 873                  * Read still goes through. We take i_data_sem in
 874                  * ext4_ext_swap_inode_data before we switch the
 875                  * inode format to prevent read.
 876                  */
 877                 inode_lock((inode));
 878                 err = ext4_ext_migrate(inode);
 879                 inode_unlock((inode));
 880                 mnt_drop_write_file(filp);
 881                 return err;
 882         }
 883
 884         case EXT4_IOC_ALLOC_DA_BLKS:
 885         {
 886                 int err;
 887                 if (!inode_owner_or_capable(inode))
 888                         return -EACCES;
 889
 890                 err = mnt_want_write_file(filp);
 891                 if (err)
 892                         return err;
 893                 err = ext4_alloc_da_blocks(inode);
 894                 mnt_drop_write_file(filp);
 895                 return err;
 896         }
 897
 898         case EXT4_IOC_SWAP_BOOT:
 899         {
 900                 int err;
 901                 if (!(filp->f_mode & FMODE_WRITE))
 902                         return -EBADF;
 903                 err = mnt_want_write_file(filp);
 904                 if (err)
 905                         return err;
 906                 err = swap_inode_boot_loader(sb, inode);
 907                 mnt_drop_write_file(filp);
 908                 return err;
 909         }
 910
 911         case EXT4_IOC_RESIZE_FS: {
 912                 ext4_fsblk_t n_blocks_count;
 913                 int err = 0, err2 = 0;
 914                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 915
 916                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 917                                    sizeof(__u64))) {
 918                         return -EFAULT;
 919                 }
 920
 921                 err = ext4_resize_begin(sb);
 922                 if (err)
 923                         return err;
 924
 925                 err = mnt_want_write_file(filp);
 926                 if (err)
 927                         goto resizefs_out;
 928
 929                 err = ext4_resize_fs(sb, n_blocks_count);
 930                 if (EXT4_SB(sb)->s_journal) {
 931                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 932                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 933                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 934                 }
 935                 if (err == 0)
 936                         err = err2;
 937                 mnt_drop_write_file(filp);
 938                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 939                     ext4_has_group_desc_csum(sb) &&
 940                     test_opt(sb, INIT_INODE_TABLE))
 941                         err = ext4_register_li_request(sb, o_group);
 942
 943 resizefs_out:
 944                 ext4_resize_end(sb);
 945                 return err;
 946         }
 947
 948         case FITRIM:
 949         {
 950                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 951                 struct fstrim_range range;
 952                 int ret = 0;
 953
 954                 if (!capable(CAP_SYS_ADMIN))
 955                         return -EPERM;
 956
 957                 if (!blk_queue_discard(q))
 958                         return -EOPNOTSUPP;
 959
 960                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 961                     sizeof(range)))
 962                         return -EFAULT;
 963
 964                 range.minlen = max((unsigned int)range.minlen,
 965                                    q->limits.discard_granularity);
 966                 ret = ext4_trim_fs(sb, &range);
 967                 if (ret < 0)
 968                         return ret;
 969
 970                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 971                     sizeof(range)))
 972                         return -EFAULT;
 973
 974                 return 0;
 975         }
 976         case EXT4_IOC_PRECACHE_EXTENTS:
 977                 return ext4_ext_precache(inode);
 978
 979         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 980                 if (!ext4_has_feature_encrypt(sb))
 981                         return -EOPNOTSUPP;
 982                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 983
 984         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 985 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 986                 int err, err2;
 987                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 988                 handle_t *handle;
 989
 990                 if (!ext4_has_feature_encrypt(sb))
 991                         return -EOPNOTSUPP;
 992                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 993                         err = mnt_want_write_file(filp);
 994                         if (err)
 995                                 return err;
 996                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 997                         if (IS_ERR(handle)) {
 998                                 err = PTR_ERR(handle);
 999                                 goto pwsalt_err_exit;
1000                         }
1001                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1002                         if (err)
1003                                 goto pwsalt_err_journal;
1004                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1005                         err = ext4_handle_dirty_metadata(handle, NULL,
1006                                                          sbi->s_sbh);
1007                 pwsalt_err_journal:
1008                         err2 = ext4_journal_stop(handle);
1009                         if (err2 && !err)
1010                                 err = err2;
1011                 pwsalt_err_exit:
1012                         mnt_drop_write_file(filp);
1013                         if (err)
1014                                 return err;
1015                 }
1016                 if (copy_to_user((void __user *) arg,
1017                                  sbi->s_es->s_encrypt_pw_salt, 16))
1018                         return -EFAULT;
1019                 return 0;
1020 #else
1021                 return -EOPNOTSUPP;
1022 #endif
1023         }
1024         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1025                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1026
1027         case EXT4_IOC_FSGETXATTR:
1028         {
1029                 struct fsxattr fa;
1030
1031                 memset(&fa, 0, sizeof(struct fsxattr));
1032                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1033
1034                 if (ext4_has_feature_project(inode->i_sb)) {
1035                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1036                                 EXT4_I(inode)->i_projid);
1037                 }
1038
1039                 if (copy_to_user((struct fsxattr __user *)arg,
1040                                  &fa, sizeof(fa)))
1041                         return -EFAULT;
1042                 return 0;
1043         }
1044         case EXT4_IOC_FSSETXATTR:
1045         {
1046                 struct fsxattr fa;
1047                 int err;
1048
1049                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1050                                    sizeof(fa)))
1051                         return -EFAULT;
1052
1053                 /* Make sure caller has proper permission */
1054                 if (!inode_owner_or_capable(inode))
1055                         return -EACCES;
1056
1057                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1058                         return -EOPNOTSUPP;
1059
1060                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1061                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1062                         return -EOPNOTSUPP;
1063
1064                 err = mnt_want_write_file(filp);
1065                 if (err)
1066                         return err;
1067
1068                 inode_lock(inode);
1069                 err = ext4_ioctl_check_project(inode, &fa);
1070                 if (err)
1071                         goto out;
1072                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1073                          (flags & EXT4_FL_XFLAG_VISIBLE);
1074                 err = ext4_ioctl_setflags(inode, flags);
1075                 if (err)
1076                         goto out;
1077                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1078 out:
1079                 inode_unlock(inode);
1080                 mnt_drop_write_file(filp);
1081                 return err;
1082         }
1083         case EXT4_IOC_SHUTDOWN:
1084                 return ext4_shutdown(sb, arg);
1085         default:
1086                 return -ENOTTY;
1087         }
1088 }
1089
1090 #ifdef CONFIG_COMPAT
1091 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1092 {
1093         /* These are just misnamed, they actually get/put from/to user an int */
1094         switch (cmd) {
1095         case EXT4_IOC32_GETFLAGS:
1096                 cmd = EXT4_IOC_GETFLAGS;
1097                 break;
1098         case EXT4_IOC32_SETFLAGS:
1099                 cmd = EXT4_IOC_SETFLAGS;
1100                 break;
1101         case EXT4_IOC32_GETVERSION:
1102                 cmd = EXT4_IOC_GETVERSION;
1103                 break;
1104         case EXT4_IOC32_SETVERSION:
1105                 cmd = EXT4_IOC_SETVERSION;
1106                 break;
1107         case EXT4_IOC32_GROUP_EXTEND:
1108                 cmd = EXT4_IOC_GROUP_EXTEND;
1109                 break;
1110         case EXT4_IOC32_GETVERSION_OLD:
1111                 cmd = EXT4_IOC_GETVERSION_OLD;
1112                 break;
1113         case EXT4_IOC32_SETVERSION_OLD:
1114                 cmd = EXT4_IOC_SETVERSION_OLD;
1115                 break;
1116         case EXT4_IOC32_GETRSVSZ:
1117                 cmd = EXT4_IOC_GETRSVSZ;
1118                 break;
1119         case EXT4_IOC32_SETRSVSZ:
1120                 cmd = EXT4_IOC_SETRSVSZ;
1121                 break;
1122         case EXT4_IOC32_GROUP_ADD: {
1123                 struct compat_ext4_new_group_input __user *uinput;
1124                 struct ext4_new_group_data input;
1125                 int err;
1126
1127                 uinput = compat_ptr(arg);
1128                 err = get_user(input.group, &uinput->group);
1129                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1130                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1131                 err |= get_user(input.inode_table, &uinput->inode_table);
1132                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1133                 err |= get_user(input.reserved_blocks,
1134                                 &uinput->reserved_blocks);
1135                 if (err)
1136                         return -EFAULT;
1137                 return ext4_ioctl_group_add(file, &input);
1138         }
1139         case EXT4_IOC_MOVE_EXT:
1140         case EXT4_IOC_RESIZE_FS:
1141         case EXT4_IOC_PRECACHE_EXTENTS:
1142         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1143         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1144         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1145         case EXT4_IOC_SHUTDOWN:
1146         case FS_IOC_GETFSMAP:
1147                 break;
1148         default:
1149                 return -ENOIOCTLCMD;
1150         }
1151         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1152 }
1153 #endif