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 (handle) { 159 err = ext4_handle_dirty_metadata(handle, NULL, bh); 160 if (err) 161 goto out_bh; 162 } else { 163 BUFFER_TRACE(bh, "marking dirty"); 164 mark_buffer_dirty(bh); 165 } 166 err = sync_dirty_buffer(bh); 167 168 out_bh: 169 brelse(bh); 170 ext4_std_error(sb, err); 171 return (err) ? err : 1; 172 } 173 174 /* 175 * Update primary and backup superblocks using the provided function 176 * func and argument arg. 177 * 178 * Only the primary superblock and at most two backup superblock 179 * modifications are journalled; the rest is modified without journal. 180 * This is safe because e2fsck will re-write them if there is a problem, 181 * and we're very unlikely to ever need more than two backups. 182 */ 183 static 184 int ext4_update_superblocks_fn(struct super_block *sb, 185 ext4_update_sb_callback func, 186 const void *arg) 187 { 188 handle_t *handle; 189 ext4_group_t ngroups; 190 unsigned int three = 1; 191 unsigned int five = 5; 192 unsigned int seven = 7; 193 int err = 0, ret, i; 194 ext4_group_t grp, primary_grp; 195 struct ext4_sb_info *sbi = EXT4_SB(sb); 196 197 /* 198 * We can't update superblocks while the online resize is running 199 */ 200 if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING, 201 &sbi->s_ext4_flags)) { 202 ext4_msg(sb, KERN_ERR, "Can't modify superblock while" 203 "performing online resize"); 204 return -EBUSY; 205 } 206 207 /* 208 * We're only going to update primary superblock and two 209 * backup superblocks in this transaction. 210 */ 211 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 3); 212 if (IS_ERR(handle)) { 213 err = PTR_ERR(handle); 214 goto out; 215 } 216 217 /* Update primary superblock */ 218 err = ext4_update_primary_sb(sb, handle, func, arg); 219 if (err) { 220 ext4_msg(sb, KERN_ERR, "Failed to update primary " 221 "superblock"); 222 goto out_journal; 223 } 224 225 primary_grp = ext4_get_group_number(sb, sbi->s_sbh->b_blocknr); 226 ngroups = ext4_get_groups_count(sb); 227 228 /* 229 * Update backup superblocks. We have to start from group 0 230 * because it might not be where the primary superblock is 231 * if the fs is mounted with -o sb=<backup_sb_block> 232 */ 233 i = 0; 234 grp = 0; 235 while (grp < ngroups) { 236 /* Skip primary superblock */ 237 if (grp == primary_grp) 238 goto next_grp; 239 240 ret = ext4_update_backup_sb(sb, handle, grp, func, arg); 241 if (ret < 0) { 242 /* Ignore bad checksum; try to update next sb */ 243 if (ret == -EFSBADCRC) 244 goto next_grp; 245 err = ret; 246 goto out_journal; 247 } 248 249 i += ret; 250 if (handle && i > 1) { 251 /* 252 * We're only journalling primary superblock and 253 * two backup superblocks; the rest is not 254 * journalled. 255 */ 256 err = ext4_journal_stop(handle); 257 if (err) 258 goto out; 259 handle = NULL; 260 } 261 next_grp: 262 grp = ext4_list_backups(sb, &three, &five, &seven); 263 } 264 265 out_journal: 266 if (handle) { 267 ret = ext4_journal_stop(handle); 268 if (ret && !err) 269 err = ret; 270 } 271 out: 272 clear_bit_unlock(EXT4_FLAGS_RESIZING, &sbi->s_ext4_flags); 273 smp_mb__after_atomic(); 274 return err ? err : 0; 275 } 276 277 /* 278 * Swap memory between @a and @b for @len bytes. 279 * 280 * @a: pointer to first memory area 281 * @b: pointer to second memory area 282 * @len: number of bytes to swap 283 * 284 */ 285 static void memswap(void *a, void *b, size_t len) 286 { 287 unsigned char *ap, *bp; 288 289 ap = (unsigned char *)a; 290 bp = (unsigned char *)b; 291 while (len-- > 0) { 292 swap(*ap, *bp); 293 ap++; 294 bp++; 295 } 296 } 297 298 /* 299 * Swap i_data and associated attributes between @inode1 and @inode2. 300 * This function is used for the primary swap between inode1 and inode2 301 * and also to revert this primary swap in case of errors. 302 * 303 * Therefore you have to make sure, that calling this method twice 304 * will revert all changes. 305 * 306 * @inode1: pointer to first inode 307 * @inode2: pointer to second inode 308 */ 309 static void swap_inode_data(struct inode *inode1, struct inode *inode2) 310 { 311 loff_t isize; 312 struct ext4_inode_info *ei1; 313 struct ext4_inode_info *ei2; 314 unsigned long tmp; 315 316 ei1 = EXT4_I(inode1); 317 ei2 = EXT4_I(inode2); 318 319 swap(inode1->i_version, inode2->i_version); 320 swap(inode1->i_atime, inode2->i_atime); 321 swap(inode1->i_mtime, inode2->i_mtime); 322 323 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data)); 324 tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP; 325 ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) | 326 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP); 327 ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP); 328 swap(ei1->i_disksize, ei2->i_disksize); 329 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); 330 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); 331 332 isize = i_size_read(inode1); 333 i_size_write(inode1, i_size_read(inode2)); 334 i_size_write(inode2, isize); 335 } 336 337 void ext4_reset_inode_seed(struct inode *inode) 338 { 339 struct ext4_inode_info *ei = EXT4_I(inode); 340 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 341 __le32 inum = cpu_to_le32(inode->i_ino); 342 __le32 gen = cpu_to_le32(inode->i_generation); 343 __u32 csum; 344 345 if (!ext4_has_metadata_csum(inode->i_sb)) 346 return; 347 348 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum)); 349 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen)); 350 } 351 352 /* 353 * Swap the information from the given @inode and the inode 354 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other 355 * important fields of the inodes. 356 * 357 * @sb: the super block of the filesystem 358 * @idmap: idmap of the mount the inode was found from 359 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO 360 * 361 */ 362 static long swap_inode_boot_loader(struct super_block *sb, 363 struct mnt_idmap *idmap, 364 struct inode *inode) 365 { 366 handle_t *handle; 367 int err; 368 struct inode *inode_bl; 369 struct ext4_inode_info *ei_bl; 370 qsize_t size, size_bl, diff; 371 blkcnt_t blocks; 372 unsigned short bytes; 373 374 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, 375 EXT4_IGET_SPECIAL | EXT4_IGET_BAD); 376 if (IS_ERR(inode_bl)) 377 return PTR_ERR(inode_bl); 378 ei_bl = EXT4_I(inode_bl); 379 380 /* Protect orig inodes against a truncate and make sure, 381 * that only 1 swap_inode_boot_loader is running. */ 382 lock_two_nondirectories(inode, inode_bl); 383 384 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) || 385 IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) || 386 (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) || 387 ext4_has_inline_data(inode)) { 388 err = -EINVAL; 389 goto journal_err_out; 390 } 391 392 if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) || 393 !inode_owner_or_capable(idmap, inode) || 394 !capable(CAP_SYS_ADMIN)) { 395 err = -EPERM; 396 goto journal_err_out; 397 } 398 399 filemap_invalidate_lock(inode->i_mapping); 400 err = filemap_write_and_wait(inode->i_mapping); 401 if (err) 402 goto err_out; 403 404 err = filemap_write_and_wait(inode_bl->i_mapping); 405 if (err) 406 goto err_out; 407 408 /* Wait for all existing dio workers */ 409 inode_dio_wait(inode); 410 inode_dio_wait(inode_bl); 411 412 truncate_inode_pages(&inode->i_data, 0); 413 truncate_inode_pages(&inode_bl->i_data, 0); 414 415 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2); 416 if (IS_ERR(handle)) { 417 err = -EINVAL; 418 goto err_out; 419 } 420 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle); 421 422 /* Protect extent tree against block allocations via delalloc */ 423 ext4_double_down_write_data_sem(inode, inode_bl); 424 425 if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) { 426 /* this inode has never been used as a BOOT_LOADER */ 427 set_nlink(inode_bl, 1); 428 i_uid_write(inode_bl, 0); 429 i_gid_write(inode_bl, 0); 430 inode_bl->i_flags = 0; 431 ei_bl->i_flags = 0; 432 inode_set_iversion(inode_bl, 1); 433 i_size_write(inode_bl, 0); 434 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size; 435 inode_bl->i_mode = S_IFREG; 436 if (ext4_has_feature_extents(sb)) { 437 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS); 438 ext4_ext_tree_init(handle, inode_bl); 439 } else 440 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); 441 } 442 443 err = dquot_initialize(inode); 444 if (err) 445 goto err_out1; 446 447 size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes; 448 size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes; 449 diff = size - size_bl; 450 swap_inode_data(inode, inode_bl); 451 452 inode->i_ctime = inode_bl->i_ctime = current_time(inode); 453 inode_inc_iversion(inode); 454 455 inode->i_generation = get_random_u32(); 456 inode_bl->i_generation = get_random_u32(); 457 ext4_reset_inode_seed(inode); 458 ext4_reset_inode_seed(inode_bl); 459 460 ext4_discard_preallocations(inode, 0); 461 462 err = ext4_mark_inode_dirty(handle, inode); 463 if (err < 0) { 464 /* No need to update quota information. */ 465 ext4_warning(inode->i_sb, 466 "couldn't mark inode #%lu dirty (err %d)", 467 inode->i_ino, err); 468 /* Revert all changes: */ 469 swap_inode_data(inode, inode_bl); 470 ext4_mark_inode_dirty(handle, inode); 471 goto err_out1; 472 } 473 474 blocks = inode_bl->i_blocks; 475 bytes = inode_bl->i_bytes; 476 inode_bl->i_blocks = inode->i_blocks; 477 inode_bl->i_bytes = inode->i_bytes; 478 err = ext4_mark_inode_dirty(handle, inode_bl); 479 if (err < 0) { 480 /* No need to update quota information. */ 481 ext4_warning(inode_bl->i_sb, 482 "couldn't mark inode #%lu dirty (err %d)", 483 inode_bl->i_ino, err); 484 goto revert; 485 } 486 487 /* Bootloader inode should not be counted into quota information. */ 488 if (diff > 0) 489 dquot_free_space(inode, diff); 490 else 491 err = dquot_alloc_space(inode, -1 * diff); 492 493 if (err < 0) { 494 revert: 495 /* Revert all changes: */ 496 inode_bl->i_blocks = blocks; 497 inode_bl->i_bytes = bytes; 498 swap_inode_data(inode, inode_bl); 499 ext4_mark_inode_dirty(handle, inode); 500 ext4_mark_inode_dirty(handle, inode_bl); 501 } 502 503 err_out1: 504 ext4_journal_stop(handle); 505 ext4_double_up_write_data_sem(inode, inode_bl); 506 507 err_out: 508 filemap_invalidate_unlock(inode->i_mapping); 509 journal_err_out: 510 unlock_two_nondirectories(inode, inode_bl); 511 iput(inode_bl); 512 return err; 513 } 514 515 /* 516 * If immutable is set and we are not clearing it, we're not allowed to change 517 * anything else in the inode. Don't error out if we're only trying to set 518 * immutable on an immutable file. 519 */ 520 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid, 521 unsigned int flags) 522 { 523 struct ext4_inode_info *ei = EXT4_I(inode); 524 unsigned int oldflags = ei->i_flags; 525 526 if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL)) 527 return 0; 528 529 if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL)) 530 return -EPERM; 531 if (ext4_has_feature_project(inode->i_sb) && 532 __kprojid_val(ei->i_projid) != new_projid) 533 return -EPERM; 534 535 return 0; 536 } 537 538 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags) 539 { 540 struct ext4_inode_info *ei = EXT4_I(inode); 541 542 if (S_ISDIR(inode->i_mode)) 543 return; 544 545 if (test_opt2(inode->i_sb, DAX_NEVER) || 546 test_opt(inode->i_sb, DAX_ALWAYS)) 547 return; 548 549 if ((ei->i_flags ^ flags) & EXT4_DAX_FL) 550 d_mark_dontcache(inode); 551 } 552 553 static bool dax_compatible(struct inode *inode, unsigned int oldflags, 554 unsigned int flags) 555 { 556 /* Allow the DAX flag to be changed on inline directories */ 557 if (S_ISDIR(inode->i_mode)) { 558 flags &= ~EXT4_INLINE_DATA_FL; 559 oldflags &= ~EXT4_INLINE_DATA_FL; 560 } 561 562 if (flags & EXT4_DAX_FL) { 563 if ((oldflags & EXT4_DAX_MUT_EXCL) || 564 ext4_test_inode_state(inode, 565 EXT4_STATE_VERITY_IN_PROGRESS)) { 566 return false; 567 } 568 } 569 570 if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL)) 571 return false; 572 573 return true; 574 } 575 576 static int ext4_ioctl_setflags(struct inode *inode, 577 unsigned int flags) 578 { 579 struct ext4_inode_info *ei = EXT4_I(inode); 580 handle_t *handle = NULL; 581 int err = -EPERM, migrate = 0; 582 struct ext4_iloc iloc; 583 unsigned int oldflags, mask, i; 584 struct super_block *sb = inode->i_sb; 585 586 /* Is it quota file? Do not allow user to mess with it */ 587 if (ext4_is_quota_file(inode)) 588 goto flags_out; 589 590 oldflags = ei->i_flags; 591 /* 592 * The JOURNAL_DATA flag can only be changed by 593 * the relevant capability. 594 */ 595 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 596 if (!capable(CAP_SYS_RESOURCE)) 597 goto flags_out; 598 } 599 600 if (!dax_compatible(inode, oldflags, flags)) { 601 err = -EOPNOTSUPP; 602 goto flags_out; 603 } 604 605 if ((flags ^ oldflags) & EXT4_EXTENTS_FL) 606 migrate = 1; 607 608 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) { 609 if (!ext4_has_feature_casefold(sb)) { 610 err = -EOPNOTSUPP; 611 goto flags_out; 612 } 613 614 if (!S_ISDIR(inode->i_mode)) { 615 err = -ENOTDIR; 616 goto flags_out; 617 } 618 619 if (!ext4_empty_dir(inode)) { 620 err = -ENOTEMPTY; 621 goto flags_out; 622 } 623 } 624 625 /* 626 * Wait for all pending directio and then flush all the dirty pages 627 * for this file. The flush marks all the pages readonly, so any 628 * subsequent attempt to write to the file (particularly mmap pages) 629 * will come through the filesystem and fail. 630 */ 631 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) && 632 (flags & EXT4_IMMUTABLE_FL)) { 633 inode_dio_wait(inode); 634 err = filemap_write_and_wait(inode->i_mapping); 635 if (err) 636 goto flags_out; 637 } 638 639 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 640 if (IS_ERR(handle)) { 641 err = PTR_ERR(handle); 642 goto flags_out; 643 } 644 if (IS_SYNC(inode)) 645 ext4_handle_sync(handle); 646 err = ext4_reserve_inode_write(handle, inode, &iloc); 647 if (err) 648 goto flags_err; 649 650 ext4_dax_dontcache(inode, flags); 651 652 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 653 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 654 continue; 655 /* These flags get special treatment later */ 656 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL) 657 continue; 658 if (mask & flags) 659 ext4_set_inode_flag(inode, i); 660 else 661 ext4_clear_inode_flag(inode, i); 662 } 663 664 ext4_set_inode_flags(inode, false); 665 666 inode->i_ctime = current_time(inode); 667 inode_inc_iversion(inode); 668 669 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 670 flags_err: 671 ext4_journal_stop(handle); 672 if (err) 673 goto flags_out; 674 675 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 676 /* 677 * Changes to the journaling mode can cause unsafe changes to 678 * S_DAX if the inode is DAX 679 */ 680 if (IS_DAX(inode)) { 681 err = -EBUSY; 682 goto flags_out; 683 } 684 685 err = ext4_change_inode_journal_flag(inode, 686 flags & EXT4_JOURNAL_DATA_FL); 687 if (err) 688 goto flags_out; 689 } 690 if (migrate) { 691 if (flags & EXT4_EXTENTS_FL) 692 err = ext4_ext_migrate(inode); 693 else 694 err = ext4_ind_migrate(inode); 695 } 696 697 flags_out: 698 return err; 699 } 700 701 #ifdef CONFIG_QUOTA 702 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 703 { 704 struct super_block *sb = inode->i_sb; 705 struct ext4_inode_info *ei = EXT4_I(inode); 706 int err, rc; 707 handle_t *handle; 708 kprojid_t kprojid; 709 struct ext4_iloc iloc; 710 struct ext4_inode *raw_inode; 711 struct dquot *transfer_to[MAXQUOTAS] = { }; 712 713 if (!ext4_has_feature_project(sb)) { 714 if (projid != EXT4_DEF_PROJID) 715 return -EOPNOTSUPP; 716 else 717 return 0; 718 } 719 720 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE) 721 return -EOPNOTSUPP; 722 723 kprojid = make_kprojid(&init_user_ns, (projid_t)projid); 724 725 if (projid_eq(kprojid, EXT4_I(inode)->i_projid)) 726 return 0; 727 728 err = -EPERM; 729 /* Is it quota file? Do not allow user to mess with it */ 730 if (ext4_is_quota_file(inode)) 731 return err; 732 733 err = dquot_initialize(inode); 734 if (err) 735 return err; 736 737 err = ext4_get_inode_loc(inode, &iloc); 738 if (err) 739 return err; 740 741 raw_inode = ext4_raw_inode(&iloc); 742 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 743 err = ext4_expand_extra_isize(inode, 744 EXT4_SB(sb)->s_want_extra_isize, 745 &iloc); 746 if (err) 747 return err; 748 } else { 749 brelse(iloc.bh); 750 } 751 752 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 753 EXT4_QUOTA_INIT_BLOCKS(sb) + 754 EXT4_QUOTA_DEL_BLOCKS(sb) + 3); 755 if (IS_ERR(handle)) 756 return PTR_ERR(handle); 757 758 err = ext4_reserve_inode_write(handle, inode, &iloc); 759 if (err) 760 goto out_stop; 761 762 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid)); 763 if (!IS_ERR(transfer_to[PRJQUOTA])) { 764 765 /* __dquot_transfer() calls back ext4_get_inode_usage() which 766 * counts xattr inode references. 767 */ 768 down_read(&EXT4_I(inode)->xattr_sem); 769 err = __dquot_transfer(inode, transfer_to); 770 up_read(&EXT4_I(inode)->xattr_sem); 771 dqput(transfer_to[PRJQUOTA]); 772 if (err) 773 goto out_dirty; 774 } 775 776 EXT4_I(inode)->i_projid = kprojid; 777 inode->i_ctime = current_time(inode); 778 inode_inc_iversion(inode); 779 out_dirty: 780 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 781 if (!err) 782 err = rc; 783 out_stop: 784 ext4_journal_stop(handle); 785 return err; 786 } 787 #else 788 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 789 { 790 if (projid != EXT4_DEF_PROJID) 791 return -EOPNOTSUPP; 792 return 0; 793 } 794 #endif 795 796 static int ext4_shutdown(struct super_block *sb, unsigned long arg) 797 { 798 struct ext4_sb_info *sbi = EXT4_SB(sb); 799 __u32 flags; 800 801 if (!capable(CAP_SYS_ADMIN)) 802 return -EPERM; 803 804 if (get_user(flags, (__u32 __user *)arg)) 805 return -EFAULT; 806 807 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH) 808 return -EINVAL; 809 810 if (ext4_forced_shutdown(sbi)) 811 return 0; 812 813 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags); 814 trace_ext4_shutdown(sb, flags); 815 816 switch (flags) { 817 case EXT4_GOING_FLAGS_DEFAULT: 818 freeze_bdev(sb->s_bdev); 819 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 820 thaw_bdev(sb->s_bdev); 821 break; 822 case EXT4_GOING_FLAGS_LOGFLUSH: 823 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 824 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) { 825 (void) ext4_force_commit(sb); 826 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 827 } 828 break; 829 case EXT4_GOING_FLAGS_NOLOGFLUSH: 830 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 831 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) 832 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 833 break; 834 default: 835 return -EINVAL; 836 } 837 clear_opt(sb, DISCARD); 838 return 0; 839 } 840 841 struct getfsmap_info { 842 struct super_block *gi_sb; 843 struct fsmap_head __user *gi_data; 844 unsigned int gi_idx; 845 __u32 gi_last_flags; 846 }; 847 848 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv) 849 { 850 struct getfsmap_info *info = priv; 851 struct fsmap fm; 852 853 trace_ext4_getfsmap_mapping(info->gi_sb, xfm); 854 855 info->gi_last_flags = xfm->fmr_flags; 856 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm); 857 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm, 858 sizeof(struct fsmap))) 859 return -EFAULT; 860 861 return 0; 862 } 863 864 static int ext4_ioc_getfsmap(struct super_block *sb, 865 struct fsmap_head __user *arg) 866 { 867 struct getfsmap_info info = { NULL }; 868 struct ext4_fsmap_head xhead = {0}; 869 struct fsmap_head head; 870 bool aborted = false; 871 int error; 872 873 if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) 874 return -EFAULT; 875 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || 876 memchr_inv(head.fmh_keys[0].fmr_reserved, 0, 877 sizeof(head.fmh_keys[0].fmr_reserved)) || 878 memchr_inv(head.fmh_keys[1].fmr_reserved, 0, 879 sizeof(head.fmh_keys[1].fmr_reserved))) 880 return -EINVAL; 881 /* 882 * ext4 doesn't report file extents at all, so the only valid 883 * file offsets are the magic ones (all zeroes or all ones). 884 */ 885 if (head.fmh_keys[0].fmr_offset || 886 (head.fmh_keys[1].fmr_offset != 0 && 887 head.fmh_keys[1].fmr_offset != -1ULL)) 888 return -EINVAL; 889 890 xhead.fmh_iflags = head.fmh_iflags; 891 xhead.fmh_count = head.fmh_count; 892 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]); 893 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]); 894 895 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]); 896 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]); 897 898 info.gi_sb = sb; 899 info.gi_data = arg; 900 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info); 901 if (error == EXT4_QUERY_RANGE_ABORT) 902 aborted = true; 903 else if (error) 904 return error; 905 906 /* If we didn't abort, set the "last" flag in the last fmx */ 907 if (!aborted && info.gi_idx) { 908 info.gi_last_flags |= FMR_OF_LAST; 909 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags, 910 &info.gi_last_flags, 911 sizeof(info.gi_last_flags))) 912 return -EFAULT; 913 } 914 915 /* copy back header */ 916 head.fmh_entries = xhead.fmh_entries; 917 head.fmh_oflags = xhead.fmh_oflags; 918 if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) 919 return -EFAULT; 920 921 return 0; 922 } 923 924 static long ext4_ioctl_group_add(struct file *file, 925 struct ext4_new_group_data *input) 926 { 927 struct super_block *sb = file_inode(file)->i_sb; 928 int err, err2=0; 929 930 err = ext4_resize_begin(sb); 931 if (err) 932 return err; 933 934 if (ext4_has_feature_bigalloc(sb)) { 935 ext4_msg(sb, KERN_ERR, 936 "Online resizing not supported with bigalloc"); 937 err = -EOPNOTSUPP; 938 goto group_add_out; 939 } 940 941 err = mnt_want_write_file(file); 942 if (err) 943 goto group_add_out; 944 945 err = ext4_group_add(sb, input); 946 if (EXT4_SB(sb)->s_journal) { 947 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 948 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 949 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 950 } 951 if (err == 0) 952 err = err2; 953 mnt_drop_write_file(file); 954 if (!err && ext4_has_group_desc_csum(sb) && 955 test_opt(sb, INIT_INODE_TABLE)) 956 err = ext4_register_li_request(sb, input->group); 957 group_add_out: 958 err2 = ext4_resize_end(sb, false); 959 if (err == 0) 960 err = err2; 961 return err; 962 } 963 964 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa) 965 { 966 struct inode *inode = d_inode(dentry); 967 struct ext4_inode_info *ei = EXT4_I(inode); 968 u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 969 970 if (S_ISREG(inode->i_mode)) 971 flags &= ~FS_PROJINHERIT_FL; 972 973 fileattr_fill_flags(fa, flags); 974 if (ext4_has_feature_project(inode->i_sb)) 975 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); 976 977 return 0; 978 } 979 980 int ext4_fileattr_set(struct mnt_idmap *idmap, 981 struct dentry *dentry, struct fileattr *fa) 982 { 983 struct inode *inode = d_inode(dentry); 984 u32 flags = fa->flags; 985 int err = -EOPNOTSUPP; 986 987 if (flags & ~EXT4_FL_USER_VISIBLE) 988 goto out; 989 990 /* 991 * chattr(1) grabs flags via GETFLAGS, modifies the result and 992 * passes that to SETFLAGS. So we cannot easily make SETFLAGS 993 * more restrictive than just silently masking off visible but 994 * not settable flags as we always did. 995 */ 996 flags &= EXT4_FL_USER_MODIFIABLE; 997 if (ext4_mask_flags(inode->i_mode, flags) != flags) 998 goto out; 999 err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags); 1000 if (err) 1001 goto out; 1002 err = ext4_ioctl_setflags(inode, flags); 1003 if (err) 1004 goto out; 1005 err = ext4_ioctl_setproject(inode, fa->fsx_projid); 1006 out: 1007 return err; 1008 } 1009 1010 /* So that the fiemap access checks can't overflow on 32 bit machines. */ 1011 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) 1012 1013 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg) 1014 { 1015 struct fiemap fiemap; 1016 struct fiemap __user *ufiemap = (struct fiemap __user *) arg; 1017 struct fiemap_extent_info fieinfo = { 0, }; 1018 struct inode *inode = file_inode(filp); 1019 int error; 1020 1021 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) 1022 return -EFAULT; 1023 1024 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) 1025 return -EINVAL; 1026 1027 fieinfo.fi_flags = fiemap.fm_flags; 1028 fieinfo.fi_extents_max = fiemap.fm_extent_count; 1029 fieinfo.fi_extents_start = ufiemap->fm_extents; 1030 1031 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start, 1032 fiemap.fm_length); 1033 fiemap.fm_flags = fieinfo.fi_flags; 1034 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; 1035 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) 1036 error = -EFAULT; 1037 1038 return error; 1039 } 1040 1041 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg) 1042 { 1043 int err = 0; 1044 __u32 flags = 0; 1045 unsigned int flush_flags = 0; 1046 struct super_block *sb = file_inode(filp)->i_sb; 1047 1048 if (copy_from_user(&flags, (__u32 __user *)arg, 1049 sizeof(__u32))) 1050 return -EFAULT; 1051 1052 if (!capable(CAP_SYS_ADMIN)) 1053 return -EPERM; 1054 1055 /* check for invalid bits set */ 1056 if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) || 1057 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1058 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT))) 1059 return -EINVAL; 1060 1061 if (!EXT4_SB(sb)->s_journal) 1062 return -ENODEV; 1063 1064 if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1065 !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev)) 1066 return -EOPNOTSUPP; 1067 1068 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 1069 return 0; 1070 1071 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD) 1072 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD; 1073 1074 if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) { 1075 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT; 1076 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow"); 1077 } 1078 1079 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1080 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags); 1081 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1082 1083 return err; 1084 } 1085 1086 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label) 1087 { 1088 size_t len; 1089 int ret = 0; 1090 char new_label[EXT4_LABEL_MAX + 1]; 1091 struct super_block *sb = file_inode(filp)->i_sb; 1092 1093 if (!capable(CAP_SYS_ADMIN)) 1094 return -EPERM; 1095 1096 /* 1097 * Copy the maximum length allowed for ext4 label with one more to 1098 * find the required terminating null byte in order to test the 1099 * label length. The on disk label doesn't need to be null terminated. 1100 */ 1101 if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1)) 1102 return -EFAULT; 1103 1104 len = strnlen(new_label, EXT4_LABEL_MAX + 1); 1105 if (len > EXT4_LABEL_MAX) 1106 return -EINVAL; 1107 1108 /* 1109 * Clear the buffer after the new label 1110 */ 1111 memset(new_label + len, 0, EXT4_LABEL_MAX - len); 1112 1113 ret = mnt_want_write_file(filp); 1114 if (ret) 1115 return ret; 1116 1117 ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label); 1118 1119 mnt_drop_write_file(filp); 1120 return ret; 1121 } 1122 1123 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label) 1124 { 1125 char label[EXT4_LABEL_MAX + 1]; 1126 1127 /* 1128 * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because 1129 * FSLABEL_MAX must include terminating null byte, while s_volume_name 1130 * does not have to. 1131 */ 1132 BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX); 1133 1134 memset(label, 0, sizeof(label)); 1135 lock_buffer(sbi->s_sbh); 1136 strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX); 1137 unlock_buffer(sbi->s_sbh); 1138 1139 if (copy_to_user(user_label, label, sizeof(label))) 1140 return -EFAULT; 1141 return 0; 1142 } 1143 1144 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi, 1145 struct fsuuid __user *ufsuuid) 1146 { 1147 struct fsuuid fsuuid; 1148 __u8 uuid[UUID_SIZE]; 1149 1150 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1151 return -EFAULT; 1152 1153 if (fsuuid.fsu_len == 0) { 1154 fsuuid.fsu_len = UUID_SIZE; 1155 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len, 1156 sizeof(fsuuid.fsu_len))) 1157 return -EFAULT; 1158 return 0; 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 fsuuid.fsu_len = UUID_SIZE; 1169 if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) || 1170 copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE)) 1171 return -EFAULT; 1172 return 0; 1173 } 1174 1175 static int ext4_ioctl_setuuid(struct file *filp, 1176 const struct fsuuid __user *ufsuuid) 1177 { 1178 int ret = 0; 1179 struct super_block *sb = file_inode(filp)->i_sb; 1180 struct fsuuid fsuuid; 1181 __u8 uuid[UUID_SIZE]; 1182 1183 if (!capable(CAP_SYS_ADMIN)) 1184 return -EPERM; 1185 1186 /* 1187 * If any checksums (group descriptors or metadata) are being used 1188 * then the checksum seed feature is required to change the UUID. 1189 */ 1190 if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb)) 1191 && !ext4_has_feature_csum_seed(sb)) 1192 || ext4_has_feature_stable_inodes(sb)) 1193 return -EOPNOTSUPP; 1194 1195 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1196 return -EFAULT; 1197 1198 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) 1199 return -EINVAL; 1200 1201 if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE)) 1202 return -EFAULT; 1203 1204 ret = mnt_want_write_file(filp); 1205 if (ret) 1206 return ret; 1207 1208 ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid); 1209 mnt_drop_write_file(filp); 1210 1211 return ret; 1212 } 1213 1214 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1215 { 1216 struct inode *inode = file_inode(filp); 1217 struct super_block *sb = inode->i_sb; 1218 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1219 1220 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 1221 1222 switch (cmd) { 1223 case FS_IOC_GETFSMAP: 1224 return ext4_ioc_getfsmap(sb, (void __user *)arg); 1225 case EXT4_IOC_GETVERSION: 1226 case EXT4_IOC_GETVERSION_OLD: 1227 return put_user(inode->i_generation, (int __user *) arg); 1228 case EXT4_IOC_SETVERSION: 1229 case EXT4_IOC_SETVERSION_OLD: { 1230 handle_t *handle; 1231 struct ext4_iloc iloc; 1232 __u32 generation; 1233 int err; 1234 1235 if (!inode_owner_or_capable(idmap, inode)) 1236 return -EPERM; 1237 1238 if (ext4_has_metadata_csum(inode->i_sb)) { 1239 ext4_warning(sb, "Setting inode version is not " 1240 "supported with metadata_csum enabled."); 1241 return -ENOTTY; 1242 } 1243 1244 err = mnt_want_write_file(filp); 1245 if (err) 1246 return err; 1247 if (get_user(generation, (int __user *) arg)) { 1248 err = -EFAULT; 1249 goto setversion_out; 1250 } 1251 1252 inode_lock(inode); 1253 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 1254 if (IS_ERR(handle)) { 1255 err = PTR_ERR(handle); 1256 goto unlock_out; 1257 } 1258 err = ext4_reserve_inode_write(handle, inode, &iloc); 1259 if (err == 0) { 1260 inode->i_ctime = current_time(inode); 1261 inode_inc_iversion(inode); 1262 inode->i_generation = generation; 1263 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 1264 } 1265 ext4_journal_stop(handle); 1266 1267 unlock_out: 1268 inode_unlock(inode); 1269 setversion_out: 1270 mnt_drop_write_file(filp); 1271 return err; 1272 } 1273 case EXT4_IOC_GROUP_EXTEND: { 1274 ext4_fsblk_t n_blocks_count; 1275 int err, err2=0; 1276 1277 err = ext4_resize_begin(sb); 1278 if (err) 1279 return err; 1280 1281 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 1282 err = -EFAULT; 1283 goto group_extend_out; 1284 } 1285 1286 if (ext4_has_feature_bigalloc(sb)) { 1287 ext4_msg(sb, KERN_ERR, 1288 "Online resizing not supported with bigalloc"); 1289 err = -EOPNOTSUPP; 1290 goto group_extend_out; 1291 } 1292 1293 err = mnt_want_write_file(filp); 1294 if (err) 1295 goto group_extend_out; 1296 1297 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 1298 if (EXT4_SB(sb)->s_journal) { 1299 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1300 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1301 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1302 } 1303 if (err == 0) 1304 err = err2; 1305 mnt_drop_write_file(filp); 1306 group_extend_out: 1307 err2 = ext4_resize_end(sb, false); 1308 if (err == 0) 1309 err = err2; 1310 return err; 1311 } 1312 1313 case EXT4_IOC_MOVE_EXT: { 1314 struct move_extent me; 1315 struct fd donor; 1316 int err; 1317 1318 if (!(filp->f_mode & FMODE_READ) || 1319 !(filp->f_mode & FMODE_WRITE)) 1320 return -EBADF; 1321 1322 if (copy_from_user(&me, 1323 (struct move_extent __user *)arg, sizeof(me))) 1324 return -EFAULT; 1325 me.moved_len = 0; 1326 1327 donor = fdget(me.donor_fd); 1328 if (!donor.file) 1329 return -EBADF; 1330 1331 if (!(donor.file->f_mode & FMODE_WRITE)) { 1332 err = -EBADF; 1333 goto mext_out; 1334 } 1335 1336 if (ext4_has_feature_bigalloc(sb)) { 1337 ext4_msg(sb, KERN_ERR, 1338 "Online defrag not supported with bigalloc"); 1339 err = -EOPNOTSUPP; 1340 goto mext_out; 1341 } else if (IS_DAX(inode)) { 1342 ext4_msg(sb, KERN_ERR, 1343 "Online defrag not supported with DAX"); 1344 err = -EOPNOTSUPP; 1345 goto mext_out; 1346 } 1347 1348 err = mnt_want_write_file(filp); 1349 if (err) 1350 goto mext_out; 1351 1352 err = ext4_move_extents(filp, donor.file, me.orig_start, 1353 me.donor_start, me.len, &me.moved_len); 1354 mnt_drop_write_file(filp); 1355 1356 if (copy_to_user((struct move_extent __user *)arg, 1357 &me, sizeof(me))) 1358 err = -EFAULT; 1359 mext_out: 1360 fdput(donor); 1361 return err; 1362 } 1363 1364 case EXT4_IOC_GROUP_ADD: { 1365 struct ext4_new_group_data input; 1366 1367 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 1368 sizeof(input))) 1369 return -EFAULT; 1370 1371 return ext4_ioctl_group_add(filp, &input); 1372 } 1373 1374 case EXT4_IOC_MIGRATE: 1375 { 1376 int err; 1377 if (!inode_owner_or_capable(idmap, inode)) 1378 return -EACCES; 1379 1380 err = mnt_want_write_file(filp); 1381 if (err) 1382 return err; 1383 /* 1384 * inode_mutex prevent write and truncate on the file. 1385 * Read still goes through. We take i_data_sem in 1386 * ext4_ext_swap_inode_data before we switch the 1387 * inode format to prevent read. 1388 */ 1389 inode_lock((inode)); 1390 err = ext4_ext_migrate(inode); 1391 inode_unlock((inode)); 1392 mnt_drop_write_file(filp); 1393 return err; 1394 } 1395 1396 case EXT4_IOC_ALLOC_DA_BLKS: 1397 { 1398 int err; 1399 if (!inode_owner_or_capable(idmap, inode)) 1400 return -EACCES; 1401 1402 err = mnt_want_write_file(filp); 1403 if (err) 1404 return err; 1405 err = ext4_alloc_da_blocks(inode); 1406 mnt_drop_write_file(filp); 1407 return err; 1408 } 1409 1410 case EXT4_IOC_SWAP_BOOT: 1411 { 1412 int err; 1413 if (!(filp->f_mode & FMODE_WRITE)) 1414 return -EBADF; 1415 err = mnt_want_write_file(filp); 1416 if (err) 1417 return err; 1418 err = swap_inode_boot_loader(sb, idmap, inode); 1419 mnt_drop_write_file(filp); 1420 return err; 1421 } 1422 1423 case EXT4_IOC_RESIZE_FS: { 1424 ext4_fsblk_t n_blocks_count; 1425 int err = 0, err2 = 0; 1426 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 1427 1428 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 1429 sizeof(__u64))) { 1430 return -EFAULT; 1431 } 1432 1433 err = ext4_resize_begin(sb); 1434 if (err) 1435 return err; 1436 1437 err = mnt_want_write_file(filp); 1438 if (err) 1439 goto resizefs_out; 1440 1441 err = ext4_resize_fs(sb, n_blocks_count); 1442 if (EXT4_SB(sb)->s_journal) { 1443 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL); 1444 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1445 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1446 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1447 } 1448 if (err == 0) 1449 err = err2; 1450 mnt_drop_write_file(filp); 1451 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) && 1452 ext4_has_group_desc_csum(sb) && 1453 test_opt(sb, INIT_INODE_TABLE)) 1454 err = ext4_register_li_request(sb, o_group); 1455 1456 resizefs_out: 1457 err2 = ext4_resize_end(sb, true); 1458 if (err == 0) 1459 err = err2; 1460 return err; 1461 } 1462 1463 case FITRIM: 1464 { 1465 struct fstrim_range range; 1466 int ret = 0; 1467 1468 if (!capable(CAP_SYS_ADMIN)) 1469 return -EPERM; 1470 1471 if (!bdev_max_discard_sectors(sb->s_bdev)) 1472 return -EOPNOTSUPP; 1473 1474 /* 1475 * We haven't replayed the journal, so we cannot use our 1476 * block-bitmap-guided storage zapping commands. 1477 */ 1478 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) 1479 return -EROFS; 1480 1481 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 1482 sizeof(range))) 1483 return -EFAULT; 1484 1485 ret = ext4_trim_fs(sb, &range); 1486 if (ret < 0) 1487 return ret; 1488 1489 if (copy_to_user((struct fstrim_range __user *)arg, &range, 1490 sizeof(range))) 1491 return -EFAULT; 1492 1493 return 0; 1494 } 1495 case EXT4_IOC_PRECACHE_EXTENTS: 1496 return ext4_ext_precache(inode); 1497 1498 case FS_IOC_SET_ENCRYPTION_POLICY: 1499 if (!ext4_has_feature_encrypt(sb)) 1500 return -EOPNOTSUPP; 1501 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); 1502 1503 case FS_IOC_GET_ENCRYPTION_PWSALT: 1504 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg); 1505 1506 case FS_IOC_GET_ENCRYPTION_POLICY: 1507 if (!ext4_has_feature_encrypt(sb)) 1508 return -EOPNOTSUPP; 1509 return fscrypt_ioctl_get_policy(filp, (void __user *)arg); 1510 1511 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1512 if (!ext4_has_feature_encrypt(sb)) 1513 return -EOPNOTSUPP; 1514 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg); 1515 1516 case FS_IOC_ADD_ENCRYPTION_KEY: 1517 if (!ext4_has_feature_encrypt(sb)) 1518 return -EOPNOTSUPP; 1519 return fscrypt_ioctl_add_key(filp, (void __user *)arg); 1520 1521 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1522 if (!ext4_has_feature_encrypt(sb)) 1523 return -EOPNOTSUPP; 1524 return fscrypt_ioctl_remove_key(filp, (void __user *)arg); 1525 1526 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1527 if (!ext4_has_feature_encrypt(sb)) 1528 return -EOPNOTSUPP; 1529 return fscrypt_ioctl_remove_key_all_users(filp, 1530 (void __user *)arg); 1531 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1532 if (!ext4_has_feature_encrypt(sb)) 1533 return -EOPNOTSUPP; 1534 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg); 1535 1536 case FS_IOC_GET_ENCRYPTION_NONCE: 1537 if (!ext4_has_feature_encrypt(sb)) 1538 return -EOPNOTSUPP; 1539 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg); 1540 1541 case EXT4_IOC_CLEAR_ES_CACHE: 1542 { 1543 if (!inode_owner_or_capable(idmap, inode)) 1544 return -EACCES; 1545 ext4_clear_inode_es(inode); 1546 return 0; 1547 } 1548 1549 case EXT4_IOC_GETSTATE: 1550 { 1551 __u32 state = 0; 1552 1553 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) 1554 state |= EXT4_STATE_FLAG_EXT_PRECACHED; 1555 if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) 1556 state |= EXT4_STATE_FLAG_NEW; 1557 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) 1558 state |= EXT4_STATE_FLAG_NEWENTRY; 1559 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) 1560 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; 1561 1562 return put_user(state, (__u32 __user *) arg); 1563 } 1564 1565 case EXT4_IOC_GET_ES_CACHE: 1566 return ext4_ioctl_get_es_cache(filp, arg); 1567 1568 case EXT4_IOC_SHUTDOWN: 1569 return ext4_shutdown(sb, arg); 1570 1571 case FS_IOC_ENABLE_VERITY: 1572 if (!ext4_has_feature_verity(sb)) 1573 return -EOPNOTSUPP; 1574 return fsverity_ioctl_enable(filp, (const void __user *)arg); 1575 1576 case FS_IOC_MEASURE_VERITY: 1577 if (!ext4_has_feature_verity(sb)) 1578 return -EOPNOTSUPP; 1579 return fsverity_ioctl_measure(filp, (void __user *)arg); 1580 1581 case FS_IOC_READ_VERITY_METADATA: 1582 if (!ext4_has_feature_verity(sb)) 1583 return -EOPNOTSUPP; 1584 return fsverity_ioctl_read_metadata(filp, 1585 (const void __user *)arg); 1586 1587 case EXT4_IOC_CHECKPOINT: 1588 return ext4_ioctl_checkpoint(filp, arg); 1589 1590 case FS_IOC_GETFSLABEL: 1591 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg); 1592 1593 case FS_IOC_SETFSLABEL: 1594 return ext4_ioctl_setlabel(filp, 1595 (const void __user *)arg); 1596 1597 case EXT4_IOC_GETFSUUID: 1598 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg); 1599 case EXT4_IOC_SETFSUUID: 1600 return ext4_ioctl_setuuid(filp, (const void __user *)arg); 1601 default: 1602 return -ENOTTY; 1603 } 1604 } 1605 1606 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1607 { 1608 return __ext4_ioctl(filp, cmd, arg); 1609 } 1610 1611 #ifdef CONFIG_COMPAT 1612 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1613 { 1614 /* These are just misnamed, they actually get/put from/to user an int */ 1615 switch (cmd) { 1616 case EXT4_IOC32_GETVERSION: 1617 cmd = EXT4_IOC_GETVERSION; 1618 break; 1619 case EXT4_IOC32_SETVERSION: 1620 cmd = EXT4_IOC_SETVERSION; 1621 break; 1622 case EXT4_IOC32_GROUP_EXTEND: 1623 cmd = EXT4_IOC_GROUP_EXTEND; 1624 break; 1625 case EXT4_IOC32_GETVERSION_OLD: 1626 cmd = EXT4_IOC_GETVERSION_OLD; 1627 break; 1628 case EXT4_IOC32_SETVERSION_OLD: 1629 cmd = EXT4_IOC_SETVERSION_OLD; 1630 break; 1631 case EXT4_IOC32_GETRSVSZ: 1632 cmd = EXT4_IOC_GETRSVSZ; 1633 break; 1634 case EXT4_IOC32_SETRSVSZ: 1635 cmd = EXT4_IOC_SETRSVSZ; 1636 break; 1637 case EXT4_IOC32_GROUP_ADD: { 1638 struct compat_ext4_new_group_input __user *uinput; 1639 struct ext4_new_group_data input; 1640 int err; 1641 1642 uinput = compat_ptr(arg); 1643 err = get_user(input.group, &uinput->group); 1644 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 1645 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 1646 err |= get_user(input.inode_table, &uinput->inode_table); 1647 err |= get_user(input.blocks_count, &uinput->blocks_count); 1648 err |= get_user(input.reserved_blocks, 1649 &uinput->reserved_blocks); 1650 if (err) 1651 return -EFAULT; 1652 return ext4_ioctl_group_add(file, &input); 1653 } 1654 case EXT4_IOC_MOVE_EXT: 1655 case EXT4_IOC_RESIZE_FS: 1656 case FITRIM: 1657 case EXT4_IOC_PRECACHE_EXTENTS: 1658 case FS_IOC_SET_ENCRYPTION_POLICY: 1659 case FS_IOC_GET_ENCRYPTION_PWSALT: 1660 case FS_IOC_GET_ENCRYPTION_POLICY: 1661 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1662 case FS_IOC_ADD_ENCRYPTION_KEY: 1663 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1664 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1665 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1666 case FS_IOC_GET_ENCRYPTION_NONCE: 1667 case EXT4_IOC_SHUTDOWN: 1668 case FS_IOC_GETFSMAP: 1669 case FS_IOC_ENABLE_VERITY: 1670 case FS_IOC_MEASURE_VERITY: 1671 case FS_IOC_READ_VERITY_METADATA: 1672 case EXT4_IOC_CLEAR_ES_CACHE: 1673 case EXT4_IOC_GETSTATE: 1674 case EXT4_IOC_GET_ES_CACHE: 1675 case EXT4_IOC_CHECKPOINT: 1676 case FS_IOC_GETFSLABEL: 1677 case FS_IOC_SETFSLABEL: 1678 case EXT4_IOC_GETFSUUID: 1679 case EXT4_IOC_SETFSUUID: 1680 break; 1681 default: 1682 return -ENOIOCTLCMD; 1683 } 1684 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 1685 } 1686 #endif 1687 1688 static void set_overhead(struct ext4_super_block *es, const void *arg) 1689 { 1690 es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg)); 1691 } 1692 1693 int ext4_update_overhead(struct super_block *sb, bool force) 1694 { 1695 struct ext4_sb_info *sbi = EXT4_SB(sb); 1696 1697 if (sb_rdonly(sb)) 1698 return 0; 1699 if (!force && 1700 (sbi->s_overhead == 0 || 1701 sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters))) 1702 return 0; 1703 return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead); 1704 } 1705