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/uaccess.h> 20 #include <linux/delay.h> 21 #include <linux/iversion.h> 22 #include <linux/fileattr.h> 23 #include <linux/uuid.h> 24 #include "ext4_jbd2.h" 25 #include "ext4.h" 26 #include <linux/fsmap.h> 27 #include "fsmap.h" 28 #include <trace/events/ext4.h> 29 30 typedef void ext4_update_sb_callback(struct ext4_super_block *es, 31 const void *arg); 32 33 /* 34 * Superblock modification callback function for changing file system 35 * label 36 */ 37 static void ext4_sb_setlabel(struct ext4_super_block *es, const void *arg) 38 { 39 /* Sanity check, this should never happen */ 40 BUILD_BUG_ON(sizeof(es->s_volume_name) < EXT4_LABEL_MAX); 41 42 memcpy(es->s_volume_name, (char *)arg, EXT4_LABEL_MAX); 43 } 44 45 /* 46 * Superblock modification callback function for changing file system 47 * UUID. 48 */ 49 static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg) 50 { 51 memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE); 52 } 53 54 static 55 int ext4_update_primary_sb(struct super_block *sb, handle_t *handle, 56 ext4_update_sb_callback func, 57 const void *arg) 58 { 59 int err = 0; 60 struct ext4_sb_info *sbi = EXT4_SB(sb); 61 struct buffer_head *bh = sbi->s_sbh; 62 struct ext4_super_block *es = sbi->s_es; 63 64 trace_ext4_update_sb(sb, bh->b_blocknr, 1); 65 66 BUFFER_TRACE(bh, "get_write_access"); 67 err = ext4_journal_get_write_access(handle, sb, 68 bh, 69 EXT4_JTR_NONE); 70 if (err) 71 goto out_err; 72 73 lock_buffer(bh); 74 func(es, arg); 75 ext4_superblock_csum_set(sb); 76 unlock_buffer(bh); 77 78 if (buffer_write_io_error(bh) || !buffer_uptodate(bh)) { 79 ext4_msg(sbi->s_sb, KERN_ERR, "previous I/O error to " 80 "superblock detected"); 81 clear_buffer_write_io_error(bh); 82 set_buffer_uptodate(bh); 83 } 84 85 err = ext4_handle_dirty_metadata(handle, NULL, bh); 86 if (err) 87 goto out_err; 88 err = sync_dirty_buffer(bh); 89 out_err: 90 ext4_std_error(sb, err); 91 return err; 92 } 93 94 /* 95 * Update one backup superblock in the group 'grp' using the callback 96 * function 'func' and argument 'arg'. If the handle is NULL the 97 * modification is not journalled. 98 * 99 * Returns: 0 when no modification was done (no superblock in the group) 100 * 1 when the modification was successful 101 * <0 on error 102 */ 103 static int ext4_update_backup_sb(struct super_block *sb, 104 handle_t *handle, ext4_group_t grp, 105 ext4_update_sb_callback func, const void *arg) 106 { 107 int err = 0; 108 ext4_fsblk_t sb_block; 109 struct buffer_head *bh; 110 unsigned long offset = 0; 111 struct ext4_super_block *es; 112 113 if (!ext4_bg_has_super(sb, grp)) 114 return 0; 115 116 /* 117 * For the group 0 there is always 1k padding, so we have 118 * either adjust offset, or sb_block depending on blocksize 119 */ 120 if (grp == 0) { 121 sb_block = 1 * EXT4_MIN_BLOCK_SIZE; 122 offset = do_div(sb_block, sb->s_blocksize); 123 } else { 124 sb_block = ext4_group_first_block_no(sb, grp); 125 offset = 0; 126 } 127 128 trace_ext4_update_sb(sb, sb_block, handle ? 1 : 0); 129 130 bh = ext4_sb_bread(sb, sb_block, 0); 131 if (IS_ERR(bh)) 132 return PTR_ERR(bh); 133 134 if (handle) { 135 BUFFER_TRACE(bh, "get_write_access"); 136 err = ext4_journal_get_write_access(handle, sb, 137 bh, 138 EXT4_JTR_NONE); 139 if (err) 140 goto out_bh; 141 } 142 143 es = (struct ext4_super_block *) (bh->b_data + offset); 144 lock_buffer(bh); 145 if (ext4_has_metadata_csum(sb) && 146 es->s_checksum != ext4_superblock_csum(sb, es)) { 147 ext4_msg(sb, KERN_ERR, "Invalid checksum for backup " 148 "superblock %llu", sb_block); 149 unlock_buffer(bh); 150 goto out_bh; 151 } 152 func(es, arg); 153 if (ext4_has_metadata_csum(sb)) 154 es->s_checksum = ext4_superblock_csum(sb, es); 155 set_buffer_uptodate(bh); 156 unlock_buffer(bh); 157 158 if (err) 159 goto out_bh; 160 161 if (handle) { 162 err = ext4_handle_dirty_metadata(handle, NULL, bh); 163 if (err) 164 goto out_bh; 165 } else { 166 BUFFER_TRACE(bh, "marking dirty"); 167 mark_buffer_dirty(bh); 168 } 169 err = sync_dirty_buffer(bh); 170 171 out_bh: 172 brelse(bh); 173 ext4_std_error(sb, err); 174 return (err) ? err : 1; 175 } 176 177 /* 178 * Update primary and backup superblocks using the provided function 179 * func and argument arg. 180 * 181 * Only the primary superblock and at most two backup superblock 182 * modifications are journalled; the rest is modified without journal. 183 * This is safe because e2fsck will re-write them if there is a problem, 184 * and we're very unlikely to ever need more than two backups. 185 */ 186 static 187 int ext4_update_superblocks_fn(struct super_block *sb, 188 ext4_update_sb_callback func, 189 const void *arg) 190 { 191 handle_t *handle; 192 ext4_group_t ngroups; 193 unsigned int three = 1; 194 unsigned int five = 5; 195 unsigned int seven = 7; 196 int err = 0, ret, i; 197 ext4_group_t grp, primary_grp; 198 struct ext4_sb_info *sbi = EXT4_SB(sb); 199 200 /* 201 * We can't update superblocks while the online resize is running 202 */ 203 if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 204 &sbi->s_ext4_flags)) { 205 ext4_msg(sb, KERN_ERR, "Can't modify superblock while" 206 "performing online resize"); 207 return -EBUSY; 208 } 209 210 /* 211 * We're only going to update primary superblock and two 212 * backup superblocks in this transaction. 213 */ 214 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3); 215 if (IS_ERR(handle)) { 216 err = PTR_ERR(handle); 217 goto out; 218 } 219 220 /* Update primary superblock */ 221 err = ext4_update_primary_sb(sb, handle, func, arg); 222 if (err) { 223 ext4_msg(sb, KERN_ERR, "Failed to update primary " 224 "superblock"); 225 goto out_journal; 226 } 227 228 primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr); 229 ngroups = ext4_get_groups_count(sb); 230 231 /* 232 * Update backup superblocks. We have to start from group 0 233 * because it might not be where the primary superblock is 234 * if the fs is mounted with -o sb=<backup_sb_block> 235 */ 236 i = 0; 237 grp = 0; 238 while (grp < ngroups) { 239 /* Skip primary superblock */ 240 if (grp == primary_grp) 241 goto next_grp; 242 243 ret = ext4_update_backup_sb(sb, handle, grp, func, arg); 244 if (ret < 0) { 245 /* Ignore bad checksum; try to update next sb */ 246 if (ret == -EFSBADCRC) 247 goto next_grp; 248 err = ret; 249 goto out_journal; 250 } 251 252 i += ret; 253 if (handle && i > 1) { 254 /* 255 * We're only journalling primary superblock and 256 * two backup superblocks; the rest is not 257 * journalled. 258 */ 259 err = ext4_journal_stop(handle); 260 if (err) 261 goto out; 262 handle = NULL; 263 } 264 next_grp: 265 grp = ext4_list_backups(sb, &three, &five, &seven); 266 } 267 268 out_journal: 269 if (handle) { 270 ret = ext4_journal_stop(handle); 271 if (ret && !err) 272 err = ret; 273 } 274 out: 275 clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags); 276 smp_mb__after_atomic(); 277 return err ? err : 0; 278 } 279 280 /* 281 * Swap memory between @a and @b for @len bytes. 282 * 283 * @a: pointer to first memory area 284 * @b: pointer to second memory area 285 * @len: number of bytes to swap 286 * 287 */ 288 static void memswap(void *a, void *b, size_t len) 289 { 290 unsigned char *ap, *bp; 291 292 ap = (unsigned char *)a; 293 bp = (unsigned char *)b; 294 while (len-- > 0) { 295 swap(*ap, *bp); 296 ap++; 297 bp++; 298 } 299 } 300 301 /* 302 * Swap i_data and associated attributes between @inode1 and @inode2. 303 * This function is used for the primary swap between inode1 and inode2 304 * and also to revert this primary swap in case of errors. 305 * 306 * Therefore you have to make sure, that calling this method twice 307 * will revert all changes. 308 * 309 * @inode1: pointer to first inode 310 * @inode2: pointer to second inode 311 */ 312 static void swap_inode_data(struct inode *inode1, struct inode *inode2) 313 { 314 loff_t isize; 315 struct ext4_inode_info *ei1; 316 struct ext4_inode_info *ei2; 317 unsigned long tmp; 318 319 ei1 = EXT4_I(inode1); 320 ei2 = EXT4_I(inode2); 321 322 swap(inode1->i_version, inode2->i_version); 323 swap(inode1->i_atime, inode2->i_atime); 324 swap(inode1->i_mtime, inode2->i_mtime); 325 326 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data)); 327 tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP; 328 ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) | 329 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP); 330 ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP); 331 swap(ei1->i_disksize, ei2->i_disksize); 332 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); 333 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); 334 335 isize = i_size_read(inode1); 336 i_size_write(inode1, i_size_read(inode2)); 337 i_size_write(inode2, isize); 338 } 339 340 void ext4_reset_inode_seed(struct inode *inode) 341 { 342 struct ext4_inode_info *ei = EXT4_I(inode); 343 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 344 __le32 inum = cpu_to_le32(inode->i_ino); 345 __le32 gen = cpu_to_le32(inode->i_generation); 346 __u32 csum; 347 348 if (!ext4_has_metadata_csum(inode->i_sb)) 349 return; 350 351 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum)); 352 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen)); 353 } 354 355 /* 356 * Swap the information from the given @inode and the inode 357 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other 358 * important fields of the inodes. 359 * 360 * @sb: the super block of the filesystem 361 * @mnt_userns: user namespace of the mount the inode was found from 362 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO 363 * 364 */ 365 static long swap_inode_boot_loader(struct super_block *sb, 366 struct user_namespace *mnt_userns, 367 struct inode *inode) 368 { 369 handle_t *handle; 370 int err; 371 struct inode *inode_bl; 372 struct ext4_inode_info *ei_bl; 373 qsize_t size, size_bl, diff; 374 blkcnt_t blocks; 375 unsigned short bytes; 376 377 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL); 378 if (IS_ERR(inode_bl)) 379 return PTR_ERR(inode_bl); 380 ei_bl = EXT4_I(inode_bl); 381 382 /* Protect orig inodes against a truncate and make sure, 383 * that only 1 swap_inode_boot_loader is running. */ 384 lock_two_nondirectories(inode, inode_bl); 385 386 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) || 387 IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) || 388 (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) || 389 ext4_has_inline_data(inode)) { 390 err = -EINVAL; 391 goto journal_err_out; 392 } 393 394 if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) || 395 !inode_owner_or_capable(mnt_userns, inode) || 396 !capable(CAP_SYS_ADMIN)) { 397 err = -EPERM; 398 goto journal_err_out; 399 } 400 401 filemap_invalidate_lock(inode->i_mapping); 402 err = filemap_write_and_wait(inode->i_mapping); 403 if (err) 404 goto err_out; 405 406 err = filemap_write_and_wait(inode_bl->i_mapping); 407 if (err) 408 goto err_out; 409 410 /* Wait for all existing dio workers */ 411 inode_dio_wait(inode); 412 inode_dio_wait(inode_bl); 413 414 truncate_inode_pages(&inode->i_data, 0); 415 truncate_inode_pages(&inode_bl->i_data, 0); 416 417 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2); 418 if (IS_ERR(handle)) { 419 err = -EINVAL; 420 goto err_out; 421 } 422 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle); 423 424 /* Protect extent tree against block allocations via delalloc */ 425 ext4_double_down_write_data_sem(inode, inode_bl); 426 427 if (inode_bl->i_nlink == 0) { 428 /* this inode has never been used as a BOOT_LOADER */ 429 set_nlink(inode_bl, 1); 430 i_uid_write(inode_bl, 0); 431 i_gid_write(inode_bl, 0); 432 inode_bl->i_flags = 0; 433 ei_bl->i_flags = 0; 434 inode_set_iversion(inode_bl, 1); 435 i_size_write(inode_bl, 0); 436 inode_bl->i_mode = S_IFREG; 437 if (ext4_has_feature_extents(sb)) { 438 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS); 439 ext4_ext_tree_init(handle, inode_bl); 440 } else 441 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); 442 } 443 444 err = dquot_initialize(inode); 445 if (err) 446 goto err_out1; 447 448 size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes; 449 size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes; 450 diff = size - size_bl; 451 swap_inode_data(inode, inode_bl); 452 453 inode->i_ctime = inode_bl->i_ctime = current_time(inode); 454 inode_inc_iversion(inode); 455 456 inode->i_generation = get_random_u32(); 457 inode_bl->i_generation = get_random_u32(); 458 ext4_reset_inode_seed(inode); 459 ext4_reset_inode_seed(inode_bl); 460 461 ext4_discard_preallocations(inode, 0); 462 463 err = ext4_mark_inode_dirty(handle, inode); 464 if (err < 0) { 465 /* No need to update quota information. */ 466 ext4_warning(inode->i_sb, 467 "couldn't mark inode #%lu dirty (err %d)", 468 inode->i_ino, err); 469 /* Revert all changes: */ 470 swap_inode_data(inode, inode_bl); 471 ext4_mark_inode_dirty(handle, inode); 472 goto err_out1; 473 } 474 475 blocks = inode_bl->i_blocks; 476 bytes = inode_bl->i_bytes; 477 inode_bl->i_blocks = inode->i_blocks; 478 inode_bl->i_bytes = inode->i_bytes; 479 err = ext4_mark_inode_dirty(handle, inode_bl); 480 if (err < 0) { 481 /* No need to update quota information. */ 482 ext4_warning(inode_bl->i_sb, 483 "couldn't mark inode #%lu dirty (err %d)", 484 inode_bl->i_ino, err); 485 goto revert; 486 } 487 488 /* Bootloader inode should not be counted into quota information. */ 489 if (diff > 0) 490 dquot_free_space(inode, diff); 491 else 492 err = dquot_alloc_space(inode, -1 * diff); 493 494 if (err < 0) { 495 revert: 496 /* Revert all changes: */ 497 inode_bl->i_blocks = blocks; 498 inode_bl->i_bytes = bytes; 499 swap_inode_data(inode, inode_bl); 500 ext4_mark_inode_dirty(handle, inode); 501 ext4_mark_inode_dirty(handle, inode_bl); 502 } 503 504 err_out1: 505 ext4_journal_stop(handle); 506 ext4_double_up_write_data_sem(inode, inode_bl); 507 508 err_out: 509 filemap_invalidate_unlock(inode->i_mapping); 510 journal_err_out: 511 unlock_two_nondirectories(inode, inode_bl); 512 iput(inode_bl); 513 return err; 514 } 515 516 /* 517 * If immutable is set and we are not clearing it, we're not allowed to change 518 * anything else in the inode. Don't error out if we're only trying to set 519 * immutable on an immutable file. 520 */ 521 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid, 522 unsigned int flags) 523 { 524 struct ext4_inode_info *ei = EXT4_I(inode); 525 unsigned int oldflags = ei->i_flags; 526 527 if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL)) 528 return 0; 529 530 if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL)) 531 return -EPERM; 532 if (ext4_has_feature_project(inode->i_sb) && 533 __kprojid_val(ei->i_projid) != new_projid) 534 return -EPERM; 535 536 return 0; 537 } 538 539 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags) 540 { 541 struct ext4_inode_info *ei = EXT4_I(inode); 542 543 if (S_ISDIR(inode->i_mode)) 544 return; 545 546 if (test_opt2(inode->i_sb, DAX_NEVER) || 547 test_opt(inode->i_sb, DAX_ALWAYS)) 548 return; 549 550 if ((ei->i_flags ^ flags) & EXT4_DAX_FL) 551 d_mark_dontcache(inode); 552 } 553 554 static bool dax_compatible(struct inode *inode, unsigned int oldflags, 555 unsigned int flags) 556 { 557 /* Allow the DAX flag to be changed on inline directories */ 558 if (S_ISDIR(inode->i_mode)) { 559 flags &= ~EXT4_INLINE_DATA_FL; 560 oldflags &= ~EXT4_INLINE_DATA_FL; 561 } 562 563 if (flags & EXT4_DAX_FL) { 564 if ((oldflags & EXT4_DAX_MUT_EXCL) || 565 ext4_test_inode_state(inode, 566 EXT4_STATE_VERITY_IN_PROGRESS)) { 567 return false; 568 } 569 } 570 571 if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL)) 572 return false; 573 574 return true; 575 } 576 577 static int ext4_ioctl_setflags(struct inode *inode, 578 unsigned int flags) 579 { 580 struct ext4_inode_info *ei = EXT4_I(inode); 581 handle_t *handle = NULL; 582 int err = -EPERM, migrate = 0; 583 struct ext4_iloc iloc; 584 unsigned int oldflags, mask, i; 585 struct super_block *sb = inode->i_sb; 586 587 /* Is it quota file? Do not allow user to mess with it */ 588 if (ext4_is_quota_file(inode)) 589 goto flags_out; 590 591 oldflags = ei->i_flags; 592 /* 593 * The JOURNAL_DATA flag can only be changed by 594 * the relevant capability. 595 */ 596 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 597 if (!capable(CAP_SYS_RESOURCE)) 598 goto flags_out; 599 } 600 601 if (!dax_compatible(inode, oldflags, flags)) { 602 err = -EOPNOTSUPP; 603 goto flags_out; 604 } 605 606 if ((flags ^ oldflags) & EXT4_EXTENTS_FL) 607 migrate = 1; 608 609 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) { 610 if (!ext4_has_feature_casefold(sb)) { 611 err = -EOPNOTSUPP; 612 goto flags_out; 613 } 614 615 if (!S_ISDIR(inode->i_mode)) { 616 err = -ENOTDIR; 617 goto flags_out; 618 } 619 620 if (!ext4_empty_dir(inode)) { 621 err = -ENOTEMPTY; 622 goto flags_out; 623 } 624 } 625 626 /* 627 * Wait for all pending directio and then flush all the dirty pages 628 * for this file. The flush marks all the pages readonly, so any 629 * subsequent attempt to write to the file (particularly mmap pages) 630 * will come through the filesystem and fail. 631 */ 632 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) && 633 (flags & EXT4_IMMUTABLE_FL)) { 634 inode_dio_wait(inode); 635 err = filemap_write_and_wait(inode->i_mapping); 636 if (err) 637 goto flags_out; 638 } 639 640 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 641 if (IS_ERR(handle)) { 642 err = PTR_ERR(handle); 643 goto flags_out; 644 } 645 if (IS_SYNC(inode)) 646 ext4_handle_sync(handle); 647 err = ext4_reserve_inode_write(handle, inode, &iloc); 648 if (err) 649 goto flags_err; 650 651 ext4_dax_dontcache(inode, flags); 652 653 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 654 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 655 continue; 656 /* These flags get special treatment later */ 657 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL) 658 continue; 659 if (mask & flags) 660 ext4_set_inode_flag(inode, i); 661 else 662 ext4_clear_inode_flag(inode, i); 663 } 664 665 ext4_set_inode_flags(inode, false); 666 667 inode->i_ctime = current_time(inode); 668 inode_inc_iversion(inode); 669 670 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 671 flags_err: 672 ext4_journal_stop(handle); 673 if (err) 674 goto flags_out; 675 676 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 677 /* 678 * Changes to the journaling mode can cause unsafe changes to 679 * S_DAX if the inode is DAX 680 */ 681 if (IS_DAX(inode)) { 682 err = -EBUSY; 683 goto flags_out; 684 } 685 686 err = ext4_change_inode_journal_flag(inode, 687 flags & EXT4_JOURNAL_DATA_FL); 688 if (err) 689 goto flags_out; 690 } 691 if (migrate) { 692 if (flags & EXT4_EXTENTS_FL) 693 err = ext4_ext_migrate(inode); 694 else 695 err = ext4_ind_migrate(inode); 696 } 697 698 flags_out: 699 return err; 700 } 701 702 #ifdef CONFIG_QUOTA 703 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 704 { 705 struct super_block *sb = inode->i_sb; 706 struct ext4_inode_info *ei = EXT4_I(inode); 707 int err, rc; 708 handle_t *handle; 709 kprojid_t kprojid; 710 struct ext4_iloc iloc; 711 struct ext4_inode *raw_inode; 712 struct dquot *transfer_to[MAXQUOTAS] = { }; 713 714 if (!ext4_has_feature_project(sb)) { 715 if (projid != EXT4_DEF_PROJID) 716 return -EOPNOTSUPP; 717 else 718 return 0; 719 } 720 721 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE) 722 return -EOPNOTSUPP; 723 724 kprojid = make_kprojid(&init_user_ns, (projid_t)projid); 725 726 if (projid_eq(kprojid, EXT4_I(inode)->i_projid)) 727 return 0; 728 729 err = -EPERM; 730 /* Is it quota file? Do not allow user to mess with it */ 731 if (ext4_is_quota_file(inode)) 732 return err; 733 734 err = ext4_get_inode_loc(inode, &iloc); 735 if (err) 736 return err; 737 738 raw_inode = ext4_raw_inode(&iloc); 739 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 740 err = ext4_expand_extra_isize(inode, 741 EXT4_SB(sb)->s_want_extra_isize, 742 &iloc); 743 if (err) 744 return err; 745 } else { 746 brelse(iloc.bh); 747 } 748 749 err = dquot_initialize(inode); 750 if (err) 751 return err; 752 753 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 754 EXT4_QUOTA_INIT_BLOCKS(sb) + 755 EXT4_QUOTA_DEL_BLOCKS(sb) + 3); 756 if (IS_ERR(handle)) 757 return PTR_ERR(handle); 758 759 err = ext4_reserve_inode_write(handle, inode, &iloc); 760 if (err) 761 goto out_stop; 762 763 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid)); 764 if (!IS_ERR(transfer_to[PRJQUOTA])) { 765 766 /* __dquot_transfer() calls back ext4_get_inode_usage() which 767 * counts xattr inode references. 768 */ 769 down_read(&EXT4_I(inode)->xattr_sem); 770 err = __dquot_transfer(inode, transfer_to); 771 up_read(&EXT4_I(inode)->xattr_sem); 772 dqput(transfer_to[PRJQUOTA]); 773 if (err) 774 goto out_dirty; 775 } 776 777 EXT4_I(inode)->i_projid = kprojid; 778 inode->i_ctime = current_time(inode); 779 inode_inc_iversion(inode); 780 out_dirty: 781 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 782 if (!err) 783 err = rc; 784 out_stop: 785 ext4_journal_stop(handle); 786 return err; 787 } 788 #else 789 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 790 { 791 if (projid != EXT4_DEF_PROJID) 792 return -EOPNOTSUPP; 793 return 0; 794 } 795 #endif 796 797 static int ext4_shutdown(struct super_block *sb, unsigned long arg) 798 { 799 struct ext4_sb_info *sbi = EXT4_SB(sb); 800 __u32 flags; 801 802 if (!capable(CAP_SYS_ADMIN)) 803 return -EPERM; 804 805 if (get_user(flags, (__u32 __user *)arg)) 806 return -EFAULT; 807 808 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH) 809 return -EINVAL; 810 811 if (ext4_forced_shutdown(sbi)) 812 return 0; 813 814 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags); 815 trace_ext4_shutdown(sb, flags); 816 817 switch (flags) { 818 case EXT4_GOING_FLAGS_DEFAULT: 819 freeze_bdev(sb->s_bdev); 820 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 821 thaw_bdev(sb->s_bdev); 822 break; 823 case EXT4_GOING_FLAGS_LOGFLUSH: 824 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 825 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) { 826 (void) ext4_force_commit(sb); 827 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 828 } 829 break; 830 case EXT4_GOING_FLAGS_NOLOGFLUSH: 831 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 832 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) 833 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 834 break; 835 default: 836 return -EINVAL; 837 } 838 clear_opt(sb, DISCARD); 839 return 0; 840 } 841 842 struct getfsmap_info { 843 struct super_block *gi_sb; 844 struct fsmap_head __user *gi_data; 845 unsigned int gi_idx; 846 __u32 gi_last_flags; 847 }; 848 849 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv) 850 { 851 struct getfsmap_info *info = priv; 852 struct fsmap fm; 853 854 trace_ext4_getfsmap_mapping(info->gi_sb, xfm); 855 856 info->gi_last_flags = xfm->fmr_flags; 857 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm); 858 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm, 859 sizeof(struct fsmap))) 860 return -EFAULT; 861 862 return 0; 863 } 864 865 static int ext4_ioc_getfsmap(struct super_block *sb, 866 struct fsmap_head __user *arg) 867 { 868 struct getfsmap_info info = { NULL }; 869 struct ext4_fsmap_head xhead = {0}; 870 struct fsmap_head head; 871 bool aborted = false; 872 int error; 873 874 if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) 875 return -EFAULT; 876 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || 877 memchr_inv(head.fmh_keys[0].fmr_reserved, 0, 878 sizeof(head.fmh_keys[0].fmr_reserved)) || 879 memchr_inv(head.fmh_keys[1].fmr_reserved, 0, 880 sizeof(head.fmh_keys[1].fmr_reserved))) 881 return -EINVAL; 882 /* 883 * ext4 doesn't report file extents at all, so the only valid 884 * file offsets are the magic ones (all zeroes or all ones). 885 */ 886 if (head.fmh_keys[0].fmr_offset || 887 (head.fmh_keys[1].fmr_offset != 0 && 888 head.fmh_keys[1].fmr_offset != -1ULL)) 889 return -EINVAL; 890 891 xhead.fmh_iflags = head.fmh_iflags; 892 xhead.fmh_count = head.fmh_count; 893 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]); 894 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]); 895 896 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]); 897 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]); 898 899 info.gi_sb = sb; 900 info.gi_data = arg; 901 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info); 902 if (error == EXT4_QUERY_RANGE_ABORT) 903 aborted = true; 904 else if (error) 905 return error; 906 907 /* If we didn't abort, set the "last" flag in the last fmx */ 908 if (!aborted && info.gi_idx) { 909 info.gi_last_flags |= FMR_OF_LAST; 910 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags, 911 &info.gi_last_flags, 912 sizeof(info.gi_last_flags))) 913 return -EFAULT; 914 } 915 916 /* copy back header */ 917 head.fmh_entries = xhead.fmh_entries; 918 head.fmh_oflags = xhead.fmh_oflags; 919 if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) 920 return -EFAULT; 921 922 return 0; 923 } 924 925 static long ext4_ioctl_group_add(struct file *file, 926 struct ext4_new_group_data *input) 927 { 928 struct super_block *sb = file_inode(file)->i_sb; 929 int err, err2=0; 930 931 err = ext4_resize_begin(sb); 932 if (err) 933 return err; 934 935 if (ext4_has_feature_bigalloc(sb)) { 936 ext4_msg(sb, KERN_ERR, 937 "Online resizing not supported with bigalloc"); 938 err = -EOPNOTSUPP; 939 goto group_add_out; 940 } 941 942 err = mnt_want_write_file(file); 943 if (err) 944 goto group_add_out; 945 946 err = ext4_group_add(sb, input); 947 if (EXT4_SB(sb)->s_journal) { 948 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 949 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 950 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 951 } 952 if (err == 0) 953 err = err2; 954 mnt_drop_write_file(file); 955 if (!err && ext4_has_group_desc_csum(sb) && 956 test_opt(sb, INIT_INODE_TABLE)) 957 err = ext4_register_li_request(sb, input->group); 958 group_add_out: 959 err2 = ext4_resize_end(sb, false); 960 if (err == 0) 961 err = err2; 962 return err; 963 } 964 965 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa) 966 { 967 struct inode *inode = d_inode(dentry); 968 struct ext4_inode_info *ei = EXT4_I(inode); 969 u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 970 971 if (S_ISREG(inode->i_mode)) 972 flags &= ~FS_PROJINHERIT_FL; 973 974 fileattr_fill_flags(fa, flags); 975 if (ext4_has_feature_project(inode->i_sb)) 976 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); 977 978 return 0; 979 } 980 981 int ext4_fileattr_set(struct user_namespace *mnt_userns, 982 struct dentry *dentry, struct fileattr *fa) 983 { 984 struct inode *inode = d_inode(dentry); 985 u32 flags = fa->flags; 986 int err = -EOPNOTSUPP; 987 988 if (flags & ~EXT4_FL_USER_VISIBLE) 989 goto out; 990 991 /* 992 * chattr(1) grabs flags via GETFLAGS, modifies the result and 993 * passes that to SETFLAGS. So we cannot easily make SETFLAGS 994 * more restrictive than just silently masking off visible but 995 * not settable flags as we always did. 996 */ 997 flags &= EXT4_FL_USER_MODIFIABLE; 998 if (ext4_mask_flags(inode->i_mode, flags) != flags) 999 goto out; 1000 err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags); 1001 if (err) 1002 goto out; 1003 err = ext4_ioctl_setflags(inode, flags); 1004 if (err) 1005 goto out; 1006 err = ext4_ioctl_setproject(inode, fa->fsx_projid); 1007 out: 1008 return err; 1009 } 1010 1011 /* So that the fiemap access checks can't overflow on 32 bit machines. */ 1012 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) 1013 1014 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg) 1015 { 1016 struct fiemap fiemap; 1017 struct fiemap __user *ufiemap = (struct fiemap __user *) arg; 1018 struct fiemap_extent_info fieinfo = { 0, }; 1019 struct inode *inode = file_inode(filp); 1020 int error; 1021 1022 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) 1023 return -EFAULT; 1024 1025 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) 1026 return -EINVAL; 1027 1028 fieinfo.fi_flags = fiemap.fm_flags; 1029 fieinfo.fi_extents_max = fiemap.fm_extent_count; 1030 fieinfo.fi_extents_start = ufiemap->fm_extents; 1031 1032 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start, 1033 fiemap.fm_length); 1034 fiemap.fm_flags = fieinfo.fi_flags; 1035 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; 1036 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) 1037 error = -EFAULT; 1038 1039 return error; 1040 } 1041 1042 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg) 1043 { 1044 int err = 0; 1045 __u32 flags = 0; 1046 unsigned int flush_flags = 0; 1047 struct super_block *sb = file_inode(filp)->i_sb; 1048 1049 if (copy_from_user(&flags, (__u32 __user *)arg, 1050 sizeof(__u32))) 1051 return -EFAULT; 1052 1053 if (!capable(CAP_SYS_ADMIN)) 1054 return -EPERM; 1055 1056 /* check for invalid bits set */ 1057 if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) || 1058 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1059 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT))) 1060 return -EINVAL; 1061 1062 if (!EXT4_SB(sb)->s_journal) 1063 return -ENODEV; 1064 1065 if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1066 !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev)) 1067 return -EOPNOTSUPP; 1068 1069 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 1070 return 0; 1071 1072 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD) 1073 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD; 1074 1075 if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) { 1076 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT; 1077 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow"); 1078 } 1079 1080 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1081 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags); 1082 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1083 1084 return err; 1085 } 1086 1087 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label) 1088 { 1089 size_t len; 1090 int ret = 0; 1091 char new_label[EXT4_LABEL_MAX + 1]; 1092 struct super_block *sb = file_inode(filp)->i_sb; 1093 1094 if (!capable(CAP_SYS_ADMIN)) 1095 return -EPERM; 1096 1097 /* 1098 * Copy the maximum length allowed for ext4 label with one more to 1099 * find the required terminating null byte in order to test the 1100 * label length. The on disk label doesn't need to be null terminated. 1101 */ 1102 if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1)) 1103 return -EFAULT; 1104 1105 len = strnlen(new_label, EXT4_LABEL_MAX + 1); 1106 if (len > EXT4_LABEL_MAX) 1107 return -EINVAL; 1108 1109 /* 1110 * Clear the buffer after the new label 1111 */ 1112 memset(new_label + len, 0, EXT4_LABEL_MAX - len); 1113 1114 ret = mnt_want_write_file(filp); 1115 if (ret) 1116 return ret; 1117 1118 ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label); 1119 1120 mnt_drop_write_file(filp); 1121 return ret; 1122 } 1123 1124 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label) 1125 { 1126 char label[EXT4_LABEL_MAX + 1]; 1127 1128 /* 1129 * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because 1130 * FSLABEL_MAX must include terminating null byte, while s_volume_name 1131 * does not have to. 1132 */ 1133 BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX); 1134 1135 memset(label, 0, sizeof(label)); 1136 lock_buffer(sbi->s_sbh); 1137 strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX); 1138 unlock_buffer(sbi->s_sbh); 1139 1140 if (copy_to_user(user_label, label, sizeof(label))) 1141 return -EFAULT; 1142 return 0; 1143 } 1144 1145 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi, 1146 struct fsuuid __user *ufsuuid) 1147 { 1148 struct fsuuid fsuuid; 1149 __u8 uuid[UUID_SIZE]; 1150 1151 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1152 return -EFAULT; 1153 1154 if (fsuuid.fsu_len == 0) { 1155 fsuuid.fsu_len = UUID_SIZE; 1156 if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid.fsu_len))) 1157 return -EFAULT; 1158 return -EINVAL; 1159 } 1160 1161 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) 1162 return -EINVAL; 1163 1164 lock_buffer(sbi->s_sbh); 1165 memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE); 1166 unlock_buffer(sbi->s_sbh); 1167 1168 if (copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE)) 1169 return -EFAULT; 1170 return 0; 1171 } 1172 1173 static int ext4_ioctl_setuuid(struct file *filp, 1174 const struct fsuuid __user *ufsuuid) 1175 { 1176 int ret = 0; 1177 struct super_block *sb = file_inode(filp)->i_sb; 1178 struct fsuuid fsuuid; 1179 __u8 uuid[UUID_SIZE]; 1180 1181 if (!capable(CAP_SYS_ADMIN)) 1182 return -EPERM; 1183 1184 /* 1185 * If any checksums (group descriptors or metadata) are being used 1186 * then the checksum seed feature is required to change the UUID. 1187 */ 1188 if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb)) 1189 && !ext4_has_feature_csum_seed(sb)) 1190 || ext4_has_feature_stable_inodes(sb)) 1191 return -EOPNOTSUPP; 1192 1193 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1194 return -EFAULT; 1195 1196 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) 1197 return -EINVAL; 1198 1199 if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE)) 1200 return -EFAULT; 1201 1202 ret = mnt_want_write_file(filp); 1203 if (ret) 1204 return ret; 1205 1206 ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid); 1207 mnt_drop_write_file(filp); 1208 1209 return ret; 1210 } 1211 1212 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1213 { 1214 struct inode *inode = file_inode(filp); 1215 struct super_block *sb = inode->i_sb; 1216 struct user_namespace *mnt_userns = file_mnt_user_ns(filp); 1217 1218 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 1219 1220 switch (cmd) { 1221 case FS_IOC_GETFSMAP: 1222 return ext4_ioc_getfsmap(sb, (void __user *)arg); 1223 case EXT4_IOC_GETVERSION: 1224 case EXT4_IOC_GETVERSION_OLD: 1225 return put_user(inode->i_generation, (int __user *) arg); 1226 case EXT4_IOC_SETVERSION: 1227 case EXT4_IOC_SETVERSION_OLD: { 1228 handle_t *handle; 1229 struct ext4_iloc iloc; 1230 __u32 generation; 1231 int err; 1232 1233 if (!inode_owner_or_capable(mnt_userns, inode)) 1234 return -EPERM; 1235 1236 if (ext4_has_metadata_csum(inode->i_sb)) { 1237 ext4_warning(sb, "Setting inode version is not " 1238 "supported with metadata_csum enabled."); 1239 return -ENOTTY; 1240 } 1241 1242 err = mnt_want_write_file(filp); 1243 if (err) 1244 return err; 1245 if (get_user(generation, (int __user *) arg)) { 1246 err = -EFAULT; 1247 goto setversion_out; 1248 } 1249 1250 inode_lock(inode); 1251 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 1252 if (IS_ERR(handle)) { 1253 err = PTR_ERR(handle); 1254 goto unlock_out; 1255 } 1256 err = ext4_reserve_inode_write(handle, inode, &iloc); 1257 if (err == 0) { 1258 inode->i_ctime = current_time(inode); 1259 inode_inc_iversion(inode); 1260 inode->i_generation = generation; 1261 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 1262 } 1263 ext4_journal_stop(handle); 1264 1265 unlock_out: 1266 inode_unlock(inode); 1267 setversion_out: 1268 mnt_drop_write_file(filp); 1269 return err; 1270 } 1271 case EXT4_IOC_GROUP_EXTEND: { 1272 ext4_fsblk_t n_blocks_count; 1273 int err, err2=0; 1274 1275 err = ext4_resize_begin(sb); 1276 if (err) 1277 return err; 1278 1279 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 1280 err = -EFAULT; 1281 goto group_extend_out; 1282 } 1283 1284 if (ext4_has_feature_bigalloc(sb)) { 1285 ext4_msg(sb, KERN_ERR, 1286 "Online resizing not supported with bigalloc"); 1287 err = -EOPNOTSUPP; 1288 goto group_extend_out; 1289 } 1290 1291 err = mnt_want_write_file(filp); 1292 if (err) 1293 goto group_extend_out; 1294 1295 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 1296 if (EXT4_SB(sb)->s_journal) { 1297 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1298 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1299 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1300 } 1301 if (err == 0) 1302 err = err2; 1303 mnt_drop_write_file(filp); 1304 group_extend_out: 1305 err2 = ext4_resize_end(sb, false); 1306 if (err == 0) 1307 err = err2; 1308 return err; 1309 } 1310 1311 case EXT4_IOC_MOVE_EXT: { 1312 struct move_extent me; 1313 struct fd donor; 1314 int err; 1315 1316 if (!(filp->f_mode & FMODE_READ) || 1317 !(filp->f_mode & FMODE_WRITE)) 1318 return -EBADF; 1319 1320 if (copy_from_user(&me, 1321 (struct move_extent __user *)arg, sizeof(me))) 1322 return -EFAULT; 1323 me.moved_len = 0; 1324 1325 donor = fdget(me.donor_fd); 1326 if (!donor.file) 1327 return -EBADF; 1328 1329 if (!(donor.file->f_mode & FMODE_WRITE)) { 1330 err = -EBADF; 1331 goto mext_out; 1332 } 1333 1334 if (ext4_has_feature_bigalloc(sb)) { 1335 ext4_msg(sb, KERN_ERR, 1336 "Online defrag not supported with bigalloc"); 1337 err = -EOPNOTSUPP; 1338 goto mext_out; 1339 } else if (IS_DAX(inode)) { 1340 ext4_msg(sb, KERN_ERR, 1341 "Online defrag not supported with DAX"); 1342 err = -EOPNOTSUPP; 1343 goto mext_out; 1344 } 1345 1346 err = mnt_want_write_file(filp); 1347 if (err) 1348 goto mext_out; 1349 1350 err = ext4_move_extents(filp, donor.file, me.orig_start, 1351 me.donor_start, me.len, &me.moved_len); 1352 mnt_drop_write_file(filp); 1353 1354 if (copy_to_user((struct move_extent __user *)arg, 1355 &me, sizeof(me))) 1356 err = -EFAULT; 1357 mext_out: 1358 fdput(donor); 1359 return err; 1360 } 1361 1362 case EXT4_IOC_GROUP_ADD: { 1363 struct ext4_new_group_data input; 1364 1365 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 1366 sizeof(input))) 1367 return -EFAULT; 1368 1369 return ext4_ioctl_group_add(filp, &input); 1370 } 1371 1372 case EXT4_IOC_MIGRATE: 1373 { 1374 int err; 1375 if (!inode_owner_or_capable(mnt_userns, inode)) 1376 return -EACCES; 1377 1378 err = mnt_want_write_file(filp); 1379 if (err) 1380 return err; 1381 /* 1382 * inode_mutex prevent write and truncate on the file. 1383 * Read still goes through. We take i_data_sem in 1384 * ext4_ext_swap_inode_data before we switch the 1385 * inode format to prevent read. 1386 */ 1387 inode_lock((inode)); 1388 err = ext4_ext_migrate(inode); 1389 inode_unlock((inode)); 1390 mnt_drop_write_file(filp); 1391 return err; 1392 } 1393 1394 case EXT4_IOC_ALLOC_DA_BLKS: 1395 { 1396 int err; 1397 if (!inode_owner_or_capable(mnt_userns, inode)) 1398 return -EACCES; 1399 1400 err = mnt_want_write_file(filp); 1401 if (err) 1402 return err; 1403 err = ext4_alloc_da_blocks(inode); 1404 mnt_drop_write_file(filp); 1405 return err; 1406 } 1407 1408 case EXT4_IOC_SWAP_BOOT: 1409 { 1410 int err; 1411 if (!(filp->f_mode & FMODE_WRITE)) 1412 return -EBADF; 1413 err = mnt_want_write_file(filp); 1414 if (err) 1415 return err; 1416 err = swap_inode_boot_loader(sb, mnt_userns, inode); 1417 mnt_drop_write_file(filp); 1418 return err; 1419 } 1420 1421 case EXT4_IOC_RESIZE_FS: { 1422 ext4_fsblk_t n_blocks_count; 1423 int err = 0, err2 = 0; 1424 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 1425 1426 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 1427 sizeof(__u64))) { 1428 return -EFAULT; 1429 } 1430 1431 err = ext4_resize_begin(sb); 1432 if (err) 1433 return err; 1434 1435 err = mnt_want_write_file(filp); 1436 if (err) 1437 goto resizefs_out; 1438 1439 err = ext4_resize_fs(sb, n_blocks_count); 1440 if (EXT4_SB(sb)->s_journal) { 1441 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL); 1442 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1443 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1444 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1445 } 1446 if (err == 0) 1447 err = err2; 1448 mnt_drop_write_file(filp); 1449 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) && 1450 ext4_has_group_desc_csum(sb) && 1451 test_opt(sb, INIT_INODE_TABLE)) 1452 err = ext4_register_li_request(sb, o_group); 1453 1454 resizefs_out: 1455 err2 = ext4_resize_end(sb, true); 1456 if (err == 0) 1457 err = err2; 1458 return err; 1459 } 1460 1461 case FITRIM: 1462 { 1463 struct fstrim_range range; 1464 int ret = 0; 1465 1466 if (!capable(CAP_SYS_ADMIN)) 1467 return -EPERM; 1468 1469 if (!bdev_max_discard_sectors(sb->s_bdev)) 1470 return -EOPNOTSUPP; 1471 1472 /* 1473 * We haven't replayed the journal, so we cannot use our 1474 * block-bitmap-guided storage zapping commands. 1475 */ 1476 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) 1477 return -EROFS; 1478 1479 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 1480 sizeof(range))) 1481 return -EFAULT; 1482 1483 ret = ext4_trim_fs(sb, &range); 1484 if (ret < 0) 1485 return ret; 1486 1487 if (copy_to_user((struct fstrim_range __user *)arg, &range, 1488 sizeof(range))) 1489 return -EFAULT; 1490 1491 return 0; 1492 } 1493 case EXT4_IOC_PRECACHE_EXTENTS: 1494 return ext4_ext_precache(inode); 1495 1496 case FS_IOC_SET_ENCRYPTION_POLICY: 1497 if (!ext4_has_feature_encrypt(sb)) 1498 return -EOPNOTSUPP; 1499 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); 1500 1501 case FS_IOC_GET_ENCRYPTION_PWSALT: 1502 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg); 1503 1504 case FS_IOC_GET_ENCRYPTION_POLICY: 1505 if (!ext4_has_feature_encrypt(sb)) 1506 return -EOPNOTSUPP; 1507 return fscrypt_ioctl_get_policy(filp, (void __user *)arg); 1508 1509 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1510 if (!ext4_has_feature_encrypt(sb)) 1511 return -EOPNOTSUPP; 1512 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg); 1513 1514 case FS_IOC_ADD_ENCRYPTION_KEY: 1515 if (!ext4_has_feature_encrypt(sb)) 1516 return -EOPNOTSUPP; 1517 return fscrypt_ioctl_add_key(filp, (void __user *)arg); 1518 1519 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1520 if (!ext4_has_feature_encrypt(sb)) 1521 return -EOPNOTSUPP; 1522 return fscrypt_ioctl_remove_key(filp, (void __user *)arg); 1523 1524 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1525 if (!ext4_has_feature_encrypt(sb)) 1526 return -EOPNOTSUPP; 1527 return fscrypt_ioctl_remove_key_all_users(filp, 1528 (void __user *)arg); 1529 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1530 if (!ext4_has_feature_encrypt(sb)) 1531 return -EOPNOTSUPP; 1532 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg); 1533 1534 case FS_IOC_GET_ENCRYPTION_NONCE: 1535 if (!ext4_has_feature_encrypt(sb)) 1536 return -EOPNOTSUPP; 1537 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg); 1538 1539 case EXT4_IOC_CLEAR_ES_CACHE: 1540 { 1541 if (!inode_owner_or_capable(mnt_userns, inode)) 1542 return -EACCES; 1543 ext4_clear_inode_es(inode); 1544 return 0; 1545 } 1546 1547 case EXT4_IOC_GETSTATE: 1548 { 1549 __u32 state = 0; 1550 1551 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) 1552 state |= EXT4_STATE_FLAG_EXT_PRECACHED; 1553 if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) 1554 state |= EXT4_STATE_FLAG_NEW; 1555 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) 1556 state |= EXT4_STATE_FLAG_NEWENTRY; 1557 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) 1558 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; 1559 1560 return put_user(state, (__u32 __user *) arg); 1561 } 1562 1563 case EXT4_IOC_GET_ES_CACHE: 1564 return ext4_ioctl_get_es_cache(filp, arg); 1565 1566 case EXT4_IOC_SHUTDOWN: 1567 return ext4_shutdown(sb, arg); 1568 1569 case FS_IOC_ENABLE_VERITY: 1570 if (!ext4_has_feature_verity(sb)) 1571 return -EOPNOTSUPP; 1572 return fsverity_ioctl_enable(filp, (const void __user *)arg); 1573 1574 case FS_IOC_MEASURE_VERITY: 1575 if (!ext4_has_feature_verity(sb)) 1576 return -EOPNOTSUPP; 1577 return fsverity_ioctl_measure(filp, (void __user *)arg); 1578 1579 case FS_IOC_READ_VERITY_METADATA: 1580 if (!ext4_has_feature_verity(sb)) 1581 return -EOPNOTSUPP; 1582 return fsverity_ioctl_read_metadata(filp, 1583 (const void __user *)arg); 1584 1585 case EXT4_IOC_CHECKPOINT: 1586 return ext4_ioctl_checkpoint(filp, arg); 1587 1588 case FS_IOC_GETFSLABEL: 1589 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg); 1590 1591 case FS_IOC_SETFSLABEL: 1592 return ext4_ioctl_setlabel(filp, 1593 (const void __user *)arg); 1594 1595 case EXT4_IOC_GETFSUUID: 1596 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg); 1597 case EXT4_IOC_SETFSUUID: 1598 return ext4_ioctl_setuuid(filp, (const void __user *)arg); 1599 default: 1600 return -ENOTTY; 1601 } 1602 } 1603 1604 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1605 { 1606 return __ext4_ioctl(filp, cmd, arg); 1607 } 1608 1609 #ifdef CONFIG_COMPAT 1610 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1611 { 1612 /* These are just misnamed, they actually get/put from/to user an int */ 1613 switch (cmd) { 1614 case EXT4_IOC32_GETVERSION: 1615 cmd = EXT4_IOC_GETVERSION; 1616 break; 1617 case EXT4_IOC32_SETVERSION: 1618 cmd = EXT4_IOC_SETVERSION; 1619 break; 1620 case EXT4_IOC32_GROUP_EXTEND: 1621 cmd = EXT4_IOC_GROUP_EXTEND; 1622 break; 1623 case EXT4_IOC32_GETVERSION_OLD: 1624 cmd = EXT4_IOC_GETVERSION_OLD; 1625 break; 1626 case EXT4_IOC32_SETVERSION_OLD: 1627 cmd = EXT4_IOC_SETVERSION_OLD; 1628 break; 1629 case EXT4_IOC32_GETRSVSZ: 1630 cmd = EXT4_IOC_GETRSVSZ; 1631 break; 1632 case EXT4_IOC32_SETRSVSZ: 1633 cmd = EXT4_IOC_SETRSVSZ; 1634 break; 1635 case EXT4_IOC32_GROUP_ADD: { 1636 struct compat_ext4_new_group_input __user *uinput; 1637 struct ext4_new_group_data input; 1638 int err; 1639 1640 uinput = compat_ptr(arg); 1641 err = get_user(input.group, &uinput->group); 1642 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 1643 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 1644 err |= get_user(input.inode_table, &uinput->inode_table); 1645 err |= get_user(input.blocks_count, &uinput->blocks_count); 1646 err |= get_user(input.reserved_blocks, 1647 &uinput->reserved_blocks); 1648 if (err) 1649 return -EFAULT; 1650 return ext4_ioctl_group_add(file, &input); 1651 } 1652 case EXT4_IOC_MOVE_EXT: 1653 case EXT4_IOC_RESIZE_FS: 1654 case FITRIM: 1655 case EXT4_IOC_PRECACHE_EXTENTS: 1656 case FS_IOC_SET_ENCRYPTION_POLICY: 1657 case FS_IOC_GET_ENCRYPTION_PWSALT: 1658 case FS_IOC_GET_ENCRYPTION_POLICY: 1659 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1660 case FS_IOC_ADD_ENCRYPTION_KEY: 1661 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1662 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1663 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1664 case FS_IOC_GET_ENCRYPTION_NONCE: 1665 case EXT4_IOC_SHUTDOWN: 1666 case FS_IOC_GETFSMAP: 1667 case FS_IOC_ENABLE_VERITY: 1668 case FS_IOC_MEASURE_VERITY: 1669 case FS_IOC_READ_VERITY_METADATA: 1670 case EXT4_IOC_CLEAR_ES_CACHE: 1671 case EXT4_IOC_GETSTATE: 1672 case EXT4_IOC_GET_ES_CACHE: 1673 case EXT4_IOC_CHECKPOINT: 1674 case FS_IOC_GETFSLABEL: 1675 case FS_IOC_SETFSLABEL: 1676 case EXT4_IOC_GETFSUUID: 1677 case EXT4_IOC_SETFSUUID: 1678 break; 1679 default: 1680 return -ENOIOCTLCMD; 1681 } 1682 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 1683 } 1684 #endif 1685 1686 static void set_overhead(struct ext4_super_block *es, const void *arg) 1687 { 1688 es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg)); 1689 } 1690 1691 int ext4_update_overhead(struct super_block *sb, bool force) 1692 { 1693 struct ext4_sb_info *sbi = EXT4_SB(sb); 1694 1695 if (sb_rdonly(sb)) 1696 return 0; 1697 if (!force && 1698 (sbi->s_overhead == 0 || 1699 sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters))) 1700 return 0; 1701 return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead); 1702 } 1703