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 30typedef 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 */ 37static 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 */ 49static void ext4_sb_setuuid(struct ext4_super_block *es, const void *arg) 50{ 51 memcpy(es->s_uuid, (__u8 *)arg, UUID_SIZE); 52} 53 54static 55int 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); 89out_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 */ 103static 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 168out_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 */ 183static 184int 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 } 261next_grp: 262 grp = ext4_list_backups(sb, &three, &five, &seven); 263 } 264 265out_journal: 266 if (handle) { 267 ret = ext4_journal_stop(handle); 268 if (ret && !err) 269 err = ret; 270 } 271out: 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 */ 285static 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 */ 309static 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 337void 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 */ 362static 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_set_ctime_current(inode); 453 inode_set_ctime_current(inode_bl); 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) { 495revert: 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 504err_out1: 505 ext4_journal_stop(handle); 506 ext4_double_up_write_data_sem(inode, inode_bl); 507 508err_out: 509 filemap_invalidate_unlock(inode->i_mapping); 510journal_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 */ 521static 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 539static 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 554static 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 577static 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_set_ctime_current(inode); 668 inode_inc_iversion(inode); 669 670 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 671flags_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 698flags_out: 699 return err; 700} 701 702#ifdef CONFIG_QUOTA 703static 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 = dquot_initialize(inode); 735 if (err) 736 return err; 737 738 err = ext4_get_inode_loc(inode, &iloc); 739 if (err) 740 return err; 741 742 raw_inode = ext4_raw_inode(&iloc); 743 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 744 err = ext4_expand_extra_isize(inode, 745 EXT4_SB(sb)->s_want_extra_isize, 746 &iloc); 747 if (err) 748 return err; 749 } else { 750 brelse(iloc.bh); 751 } 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_set_ctime_current(inode); 779 inode_inc_iversion(inode); 780out_dirty: 781 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 782 if (!err) 783 err = rc; 784out_stop: 785 ext4_journal_stop(handle); 786 return err; 787} 788#else 789static 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 797int ext4_force_shutdown(struct super_block *sb, u32 flags) 798{ 799 struct ext4_sb_info *sbi = EXT4_SB(sb); 800 int ret; 801 802 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH) 803 return -EINVAL; 804 805 if (ext4_forced_shutdown(sb)) 806 return 0; 807 808 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags); 809 trace_ext4_shutdown(sb, flags); 810 811 switch (flags) { 812 case EXT4_GOING_FLAGS_DEFAULT: 813 ret = freeze_bdev(sb->s_bdev); 814 if (ret) 815 return ret; 816 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 817 thaw_bdev(sb->s_bdev); 818 break; 819 case EXT4_GOING_FLAGS_LOGFLUSH: 820 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 821 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) { 822 (void) ext4_force_commit(sb); 823 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 824 } 825 break; 826 case EXT4_GOING_FLAGS_NOLOGFLUSH: 827 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 828 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) 829 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 830 break; 831 default: 832 return -EINVAL; 833 } 834 clear_opt(sb, DISCARD); 835 return 0; 836} 837 838static int ext4_ioctl_shutdown(struct super_block *sb, unsigned long arg) 839{ 840 u32 flags; 841 842 if (!capable(CAP_SYS_ADMIN)) 843 return -EPERM; 844 845 if (get_user(flags, (__u32 __user *)arg)) 846 return -EFAULT; 847 848 return ext4_force_shutdown(sb, flags); 849} 850 851struct getfsmap_info { 852 struct super_block *gi_sb; 853 struct fsmap_head __user *gi_data; 854 unsigned int gi_idx; 855 __u32 gi_last_flags; 856}; 857 858static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv) 859{ 860 struct getfsmap_info *info = priv; 861 struct fsmap fm; 862 863 trace_ext4_getfsmap_mapping(info->gi_sb, xfm); 864 865 info->gi_last_flags = xfm->fmr_flags; 866 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm); 867 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm, 868 sizeof(struct fsmap))) 869 return -EFAULT; 870 871 return 0; 872} 873 874static int ext4_ioc_getfsmap(struct super_block *sb, 875 struct fsmap_head __user *arg) 876{ 877 struct getfsmap_info info = { NULL }; 878 struct ext4_fsmap_head xhead = {0}; 879 struct fsmap_head head; 880 bool aborted = false; 881 int error; 882 883 if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) 884 return -EFAULT; 885 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || 886 memchr_inv(head.fmh_keys[0].fmr_reserved, 0, 887 sizeof(head.fmh_keys[0].fmr_reserved)) || 888 memchr_inv(head.fmh_keys[1].fmr_reserved, 0, 889 sizeof(head.fmh_keys[1].fmr_reserved))) 890 return -EINVAL; 891 /* 892 * ext4 doesn't report file extents at all, so the only valid 893 * file offsets are the magic ones (all zeroes or all ones). 894 */ 895 if (head.fmh_keys[0].fmr_offset || 896 (head.fmh_keys[1].fmr_offset != 0 && 897 head.fmh_keys[1].fmr_offset != -1ULL)) 898 return -EINVAL; 899 900 xhead.fmh_iflags = head.fmh_iflags; 901 xhead.fmh_count = head.fmh_count; 902 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]); 903 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]); 904 905 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]); 906 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]); 907 908 info.gi_sb = sb; 909 info.gi_data = arg; 910 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info); 911 if (error == EXT4_QUERY_RANGE_ABORT) 912 aborted = true; 913 else if (error) 914 return error; 915 916 /* If we didn't abort, set the "last" flag in the last fmx */ 917 if (!aborted && info.gi_idx) { 918 info.gi_last_flags |= FMR_OF_LAST; 919 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags, 920 &info.gi_last_flags, 921 sizeof(info.gi_last_flags))) 922 return -EFAULT; 923 } 924 925 /* copy back header */ 926 head.fmh_entries = xhead.fmh_entries; 927 head.fmh_oflags = xhead.fmh_oflags; 928 if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) 929 return -EFAULT; 930 931 return 0; 932} 933 934static long ext4_ioctl_group_add(struct file *file, 935 struct ext4_new_group_data *input) 936{ 937 struct super_block *sb = file_inode(file)->i_sb; 938 int err, err2=0; 939 940 err = ext4_resize_begin(sb); 941 if (err) 942 return err; 943 944 if (ext4_has_feature_bigalloc(sb)) { 945 ext4_msg(sb, KERN_ERR, 946 "Online resizing not supported with bigalloc"); 947 err = -EOPNOTSUPP; 948 goto group_add_out; 949 } 950 951 err = mnt_want_write_file(file); 952 if (err) 953 goto group_add_out; 954 955 err = ext4_group_add(sb, input); 956 if (EXT4_SB(sb)->s_journal) { 957 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 958 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 959 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 960 } 961 if (err == 0) 962 err = err2; 963 mnt_drop_write_file(file); 964 if (!err && ext4_has_group_desc_csum(sb) && 965 test_opt(sb, INIT_INODE_TABLE)) 966 err = ext4_register_li_request(sb, input->group); 967group_add_out: 968 err2 = ext4_resize_end(sb, false); 969 if (err == 0) 970 err = err2; 971 return err; 972} 973 974int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa) 975{ 976 struct inode *inode = d_inode(dentry); 977 struct ext4_inode_info *ei = EXT4_I(inode); 978 u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 979 980 if (S_ISREG(inode->i_mode)) 981 flags &= ~FS_PROJINHERIT_FL; 982 983 fileattr_fill_flags(fa, flags); 984 if (ext4_has_feature_project(inode->i_sb)) 985 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); 986 987 return 0; 988} 989 990int ext4_fileattr_set(struct mnt_idmap *idmap, 991 struct dentry *dentry, struct fileattr *fa) 992{ 993 struct inode *inode = d_inode(dentry); 994 u32 flags = fa->flags; 995 int err = -EOPNOTSUPP; 996 997 if (flags & ~EXT4_FL_USER_VISIBLE) 998 goto out; 999 1000 /* 1001 * chattr(1) grabs flags via GETFLAGS, modifies the result and 1002 * passes that to SETFLAGS. So we cannot easily make SETFLAGS 1003 * more restrictive than just silently masking off visible but 1004 * not settable flags as we always did. 1005 */ 1006 flags &= EXT4_FL_USER_MODIFIABLE; 1007 if (ext4_mask_flags(inode->i_mode, flags) != flags) 1008 goto out; 1009 err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags); 1010 if (err) 1011 goto out; 1012 err = ext4_ioctl_setflags(inode, flags); 1013 if (err) 1014 goto out; 1015 err = ext4_ioctl_setproject(inode, fa->fsx_projid); 1016out: 1017 return err; 1018} 1019 1020/* So that the fiemap access checks can't overflow on 32 bit machines. */ 1021#define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) 1022 1023static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg) 1024{ 1025 struct fiemap fiemap; 1026 struct fiemap __user *ufiemap = (struct fiemap __user *) arg; 1027 struct fiemap_extent_info fieinfo = { 0, }; 1028 struct inode *inode = file_inode(filp); 1029 int error; 1030 1031 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) 1032 return -EFAULT; 1033 1034 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) 1035 return -EINVAL; 1036 1037 fieinfo.fi_flags = fiemap.fm_flags; 1038 fieinfo.fi_extents_max = fiemap.fm_extent_count; 1039 fieinfo.fi_extents_start = ufiemap->fm_extents; 1040 1041 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start, 1042 fiemap.fm_length); 1043 fiemap.fm_flags = fieinfo.fi_flags; 1044 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; 1045 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) 1046 error = -EFAULT; 1047 1048 return error; 1049} 1050 1051static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg) 1052{ 1053 int err = 0; 1054 __u32 flags = 0; 1055 unsigned int flush_flags = 0; 1056 struct super_block *sb = file_inode(filp)->i_sb; 1057 1058 if (copy_from_user(&flags, (__u32 __user *)arg, 1059 sizeof(__u32))) 1060 return -EFAULT; 1061 1062 if (!capable(CAP_SYS_ADMIN)) 1063 return -EPERM; 1064 1065 /* check for invalid bits set */ 1066 if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) || 1067 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1068 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT))) 1069 return -EINVAL; 1070 1071 if (!EXT4_SB(sb)->s_journal) 1072 return -ENODEV; 1073 1074 if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1075 !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev)) 1076 return -EOPNOTSUPP; 1077 1078 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 1079 return 0; 1080 1081 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD) 1082 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD; 1083 1084 if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) { 1085 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT; 1086 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow"); 1087 } 1088 1089 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1090 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags); 1091 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1092 1093 return err; 1094} 1095 1096static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label) 1097{ 1098 size_t len; 1099 int ret = 0; 1100 char new_label[EXT4_LABEL_MAX + 1]; 1101 struct super_block *sb = file_inode(filp)->i_sb; 1102 1103 if (!capable(CAP_SYS_ADMIN)) 1104 return -EPERM; 1105 1106 /* 1107 * Copy the maximum length allowed for ext4 label with one more to 1108 * find the required terminating null byte in order to test the 1109 * label length. The on disk label doesn't need to be null terminated. 1110 */ 1111 if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1)) 1112 return -EFAULT; 1113 1114 len = strnlen(new_label, EXT4_LABEL_MAX + 1); 1115 if (len > EXT4_LABEL_MAX) 1116 return -EINVAL; 1117 1118 /* 1119 * Clear the buffer after the new label 1120 */ 1121 memset(new_label + len, 0, EXT4_LABEL_MAX - len); 1122 1123 ret = mnt_want_write_file(filp); 1124 if (ret) 1125 return ret; 1126 1127 ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label); 1128 1129 mnt_drop_write_file(filp); 1130 return ret; 1131} 1132 1133static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label) 1134{ 1135 char label[EXT4_LABEL_MAX + 1]; 1136 1137 /* 1138 * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because 1139 * FSLABEL_MAX must include terminating null byte, while s_volume_name 1140 * does not have to. 1141 */ 1142 BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX); 1143 1144 memset(label, 0, sizeof(label)); 1145 lock_buffer(sbi->s_sbh); 1146 strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX); 1147 unlock_buffer(sbi->s_sbh); 1148 1149 if (copy_to_user(user_label, label, sizeof(label))) 1150 return -EFAULT; 1151 return 0; 1152} 1153 1154static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi, 1155 struct fsuuid __user *ufsuuid) 1156{ 1157 struct fsuuid fsuuid; 1158 __u8 uuid[UUID_SIZE]; 1159 1160 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1161 return -EFAULT; 1162 1163 if (fsuuid.fsu_len == 0) { 1164 fsuuid.fsu_len = UUID_SIZE; 1165 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len, 1166 sizeof(fsuuid.fsu_len))) 1167 return -EFAULT; 1168 return 0; 1169 } 1170 1171 if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0) 1172 return -EINVAL; 1173 1174 lock_buffer(sbi->s_sbh); 1175 memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE); 1176 unlock_buffer(sbi->s_sbh); 1177 1178 fsuuid.fsu_len = UUID_SIZE; 1179 if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) || 1180 copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE)) 1181 return -EFAULT; 1182 return 0; 1183} 1184 1185static int ext4_ioctl_setuuid(struct file *filp, 1186 const struct fsuuid __user *ufsuuid) 1187{ 1188 int ret = 0; 1189 struct super_block *sb = file_inode(filp)->i_sb; 1190 struct fsuuid fsuuid; 1191 __u8 uuid[UUID_SIZE]; 1192 1193 if (!capable(CAP_SYS_ADMIN)) 1194 return -EPERM; 1195 1196 /* 1197 * If any checksums (group descriptors or metadata) are being used 1198 * then the checksum seed feature is required to change the UUID. 1199 */ 1200 if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb)) 1201 && !ext4_has_feature_csum_seed(sb)) 1202 || ext4_has_feature_stable_inodes(sb)) 1203 return -EOPNOTSUPP; 1204 1205 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1206 return -EFAULT; 1207 1208 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) 1209 return -EINVAL; 1210 1211 if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE)) 1212 return -EFAULT; 1213 1214 ret = mnt_want_write_file(filp); 1215 if (ret) 1216 return ret; 1217 1218 ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid); 1219 mnt_drop_write_file(filp); 1220 1221 return ret; 1222} 1223 1224static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1225{ 1226 struct inode *inode = file_inode(filp); 1227 struct super_block *sb = inode->i_sb; 1228 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1229 1230 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 1231 1232 switch (cmd) { 1233 case FS_IOC_GETFSMAP: 1234 return ext4_ioc_getfsmap(sb, (void __user *)arg); 1235 case EXT4_IOC_GETVERSION: 1236 case EXT4_IOC_GETVERSION_OLD: 1237 return put_user(inode->i_generation, (int __user *) arg); 1238 case EXT4_IOC_SETVERSION: 1239 case EXT4_IOC_SETVERSION_OLD: { 1240 handle_t *handle; 1241 struct ext4_iloc iloc; 1242 __u32 generation; 1243 int err; 1244 1245 if (!inode_owner_or_capable(idmap, inode)) 1246 return -EPERM; 1247 1248 if (ext4_has_metadata_csum(inode->i_sb)) { 1249 ext4_warning(sb, "Setting inode version is not " 1250 "supported with metadata_csum enabled."); 1251 return -ENOTTY; 1252 } 1253 1254 err = mnt_want_write_file(filp); 1255 if (err) 1256 return err; 1257 if (get_user(generation, (int __user *) arg)) { 1258 err = -EFAULT; 1259 goto setversion_out; 1260 } 1261 1262 inode_lock(inode); 1263 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 1264 if (IS_ERR(handle)) { 1265 err = PTR_ERR(handle); 1266 goto unlock_out; 1267 } 1268 err = ext4_reserve_inode_write(handle, inode, &iloc); 1269 if (err == 0) { 1270 inode_set_ctime_current(inode); 1271 inode_inc_iversion(inode); 1272 inode->i_generation = generation; 1273 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 1274 } 1275 ext4_journal_stop(handle); 1276 1277unlock_out: 1278 inode_unlock(inode); 1279setversion_out: 1280 mnt_drop_write_file(filp); 1281 return err; 1282 } 1283 case EXT4_IOC_GROUP_EXTEND: { 1284 ext4_fsblk_t n_blocks_count; 1285 int err, err2=0; 1286 1287 err = ext4_resize_begin(sb); 1288 if (err) 1289 return err; 1290 1291 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 1292 err = -EFAULT; 1293 goto group_extend_out; 1294 } 1295 1296 if (ext4_has_feature_bigalloc(sb)) { 1297 ext4_msg(sb, KERN_ERR, 1298 "Online resizing not supported with bigalloc"); 1299 err = -EOPNOTSUPP; 1300 goto group_extend_out; 1301 } 1302 1303 err = mnt_want_write_file(filp); 1304 if (err) 1305 goto group_extend_out; 1306 1307 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 1308 if (EXT4_SB(sb)->s_journal) { 1309 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1310 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1311 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1312 } 1313 if (err == 0) 1314 err = err2; 1315 mnt_drop_write_file(filp); 1316group_extend_out: 1317 err2 = ext4_resize_end(sb, false); 1318 if (err == 0) 1319 err = err2; 1320 return err; 1321 } 1322 1323 case EXT4_IOC_MOVE_EXT: { 1324 struct move_extent me; 1325 struct fd donor; 1326 int err; 1327 1328 if (!(filp->f_mode & FMODE_READ) || 1329 !(filp->f_mode & FMODE_WRITE)) 1330 return -EBADF; 1331 1332 if (copy_from_user(&me, 1333 (struct move_extent __user *)arg, sizeof(me))) 1334 return -EFAULT; 1335 me.moved_len = 0; 1336 1337 donor = fdget(me.donor_fd); 1338 if (!donor.file) 1339 return -EBADF; 1340 1341 if (!(donor.file->f_mode & FMODE_WRITE)) { 1342 err = -EBADF; 1343 goto mext_out; 1344 } 1345 1346 if (ext4_has_feature_bigalloc(sb)) { 1347 ext4_msg(sb, KERN_ERR, 1348 "Online defrag not supported with bigalloc"); 1349 err = -EOPNOTSUPP; 1350 goto mext_out; 1351 } else if (IS_DAX(inode)) { 1352 ext4_msg(sb, KERN_ERR, 1353 "Online defrag not supported with DAX"); 1354 err = -EOPNOTSUPP; 1355 goto mext_out; 1356 } 1357 1358 err = mnt_want_write_file(filp); 1359 if (err) 1360 goto mext_out; 1361 1362 err = ext4_move_extents(filp, donor.file, me.orig_start, 1363 me.donor_start, me.len, &me.moved_len); 1364 mnt_drop_write_file(filp); 1365 1366 if (copy_to_user((struct move_extent __user *)arg, 1367 &me, sizeof(me))) 1368 err = -EFAULT; 1369mext_out: 1370 fdput(donor); 1371 return err; 1372 } 1373 1374 case EXT4_IOC_GROUP_ADD: { 1375 struct ext4_new_group_data input; 1376 1377 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 1378 sizeof(input))) 1379 return -EFAULT; 1380 1381 return ext4_ioctl_group_add(filp, &input); 1382 } 1383 1384 case EXT4_IOC_MIGRATE: 1385 { 1386 int err; 1387 if (!inode_owner_or_capable(idmap, inode)) 1388 return -EACCES; 1389 1390 err = mnt_want_write_file(filp); 1391 if (err) 1392 return err; 1393 /* 1394 * inode_mutex prevent write and truncate on the file. 1395 * Read still goes through. We take i_data_sem in 1396 * ext4_ext_swap_inode_data before we switch the 1397 * inode format to prevent read. 1398 */ 1399 inode_lock((inode)); 1400 err = ext4_ext_migrate(inode); 1401 inode_unlock((inode)); 1402 mnt_drop_write_file(filp); 1403 return err; 1404 } 1405 1406 case EXT4_IOC_ALLOC_DA_BLKS: 1407 { 1408 int err; 1409 if (!inode_owner_or_capable(idmap, inode)) 1410 return -EACCES; 1411 1412 err = mnt_want_write_file(filp); 1413 if (err) 1414 return err; 1415 err = ext4_alloc_da_blocks(inode); 1416 mnt_drop_write_file(filp); 1417 return err; 1418 } 1419 1420 case EXT4_IOC_SWAP_BOOT: 1421 { 1422 int err; 1423 if (!(filp->f_mode & FMODE_WRITE)) 1424 return -EBADF; 1425 err = mnt_want_write_file(filp); 1426 if (err) 1427 return err; 1428 err = swap_inode_boot_loader(sb, idmap, inode); 1429 mnt_drop_write_file(filp); 1430 return err; 1431 } 1432 1433 case EXT4_IOC_RESIZE_FS: { 1434 ext4_fsblk_t n_blocks_count; 1435 int err = 0, err2 = 0; 1436 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 1437 1438 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 1439 sizeof(__u64))) { 1440 return -EFAULT; 1441 } 1442 1443 err = ext4_resize_begin(sb); 1444 if (err) 1445 return err; 1446 1447 err = mnt_want_write_file(filp); 1448 if (err) 1449 goto resizefs_out; 1450 1451 err = ext4_resize_fs(sb, n_blocks_count); 1452 if (EXT4_SB(sb)->s_journal) { 1453 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL); 1454 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1455 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1456 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1457 } 1458 if (err == 0) 1459 err = err2; 1460 mnt_drop_write_file(filp); 1461 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) && 1462 ext4_has_group_desc_csum(sb) && 1463 test_opt(sb, INIT_INODE_TABLE)) 1464 err = ext4_register_li_request(sb, o_group); 1465 1466resizefs_out: 1467 err2 = ext4_resize_end(sb, true); 1468 if (err == 0) 1469 err = err2; 1470 return err; 1471 } 1472 1473 case FITRIM: 1474 { 1475 struct fstrim_range range; 1476 int ret = 0; 1477 1478 if (!capable(CAP_SYS_ADMIN)) 1479 return -EPERM; 1480 1481 if (!bdev_max_discard_sectors(sb->s_bdev)) 1482 return -EOPNOTSUPP; 1483 1484 /* 1485 * We haven't replayed the journal, so we cannot use our 1486 * block-bitmap-guided storage zapping commands. 1487 */ 1488 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) 1489 return -EROFS; 1490 1491 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 1492 sizeof(range))) 1493 return -EFAULT; 1494 1495 ret = ext4_trim_fs(sb, &range); 1496 if (ret < 0) 1497 return ret; 1498 1499 if (copy_to_user((struct fstrim_range __user *)arg, &range, 1500 sizeof(range))) 1501 return -EFAULT; 1502 1503 return 0; 1504 } 1505 case EXT4_IOC_PRECACHE_EXTENTS: 1506 return ext4_ext_precache(inode); 1507 1508 case FS_IOC_SET_ENCRYPTION_POLICY: 1509 if (!ext4_has_feature_encrypt(sb)) 1510 return -EOPNOTSUPP; 1511 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); 1512 1513 case FS_IOC_GET_ENCRYPTION_PWSALT: 1514 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg); 1515 1516 case FS_IOC_GET_ENCRYPTION_POLICY: 1517 if (!ext4_has_feature_encrypt(sb)) 1518 return -EOPNOTSUPP; 1519 return fscrypt_ioctl_get_policy(filp, (void __user *)arg); 1520 1521 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1522 if (!ext4_has_feature_encrypt(sb)) 1523 return -EOPNOTSUPP; 1524 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg); 1525 1526 case FS_IOC_ADD_ENCRYPTION_KEY: 1527 if (!ext4_has_feature_encrypt(sb)) 1528 return -EOPNOTSUPP; 1529 return fscrypt_ioctl_add_key(filp, (void __user *)arg); 1530 1531 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1532 if (!ext4_has_feature_encrypt(sb)) 1533 return -EOPNOTSUPP; 1534 return fscrypt_ioctl_remove_key(filp, (void __user *)arg); 1535 1536 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1537 if (!ext4_has_feature_encrypt(sb)) 1538 return -EOPNOTSUPP; 1539 return fscrypt_ioctl_remove_key_all_users(filp, 1540 (void __user *)arg); 1541 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1542 if (!ext4_has_feature_encrypt(sb)) 1543 return -EOPNOTSUPP; 1544 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg); 1545 1546 case FS_IOC_GET_ENCRYPTION_NONCE: 1547 if (!ext4_has_feature_encrypt(sb)) 1548 return -EOPNOTSUPP; 1549 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg); 1550 1551 case EXT4_IOC_CLEAR_ES_CACHE: 1552 { 1553 if (!inode_owner_or_capable(idmap, inode)) 1554 return -EACCES; 1555 ext4_clear_inode_es(inode); 1556 return 0; 1557 } 1558 1559 case EXT4_IOC_GETSTATE: 1560 { 1561 __u32 state = 0; 1562 1563 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) 1564 state |= EXT4_STATE_FLAG_EXT_PRECACHED; 1565 if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) 1566 state |= EXT4_STATE_FLAG_NEW; 1567 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) 1568 state |= EXT4_STATE_FLAG_NEWENTRY; 1569 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) 1570 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; 1571 1572 return put_user(state, (__u32 __user *) arg); 1573 } 1574 1575 case EXT4_IOC_GET_ES_CACHE: 1576 return ext4_ioctl_get_es_cache(filp, arg); 1577 1578 case EXT4_IOC_SHUTDOWN: 1579 return ext4_ioctl_shutdown(sb, arg); 1580 1581 case FS_IOC_ENABLE_VERITY: 1582 if (!ext4_has_feature_verity(sb)) 1583 return -EOPNOTSUPP; 1584 return fsverity_ioctl_enable(filp, (const void __user *)arg); 1585 1586 case FS_IOC_MEASURE_VERITY: 1587 if (!ext4_has_feature_verity(sb)) 1588 return -EOPNOTSUPP; 1589 return fsverity_ioctl_measure(filp, (void __user *)arg); 1590 1591 case FS_IOC_READ_VERITY_METADATA: 1592 if (!ext4_has_feature_verity(sb)) 1593 return -EOPNOTSUPP; 1594 return fsverity_ioctl_read_metadata(filp, 1595 (const void __user *)arg); 1596 1597 case EXT4_IOC_CHECKPOINT: 1598 return ext4_ioctl_checkpoint(filp, arg); 1599 1600 case FS_IOC_GETFSLABEL: 1601 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg); 1602 1603 case FS_IOC_SETFSLABEL: 1604 return ext4_ioctl_setlabel(filp, 1605 (const void __user *)arg); 1606 1607 case EXT4_IOC_GETFSUUID: 1608 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg); 1609 case EXT4_IOC_SETFSUUID: 1610 return ext4_ioctl_setuuid(filp, (const void __user *)arg); 1611 default: 1612 return -ENOTTY; 1613 } 1614} 1615 1616long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1617{ 1618 return __ext4_ioctl(filp, cmd, arg); 1619} 1620 1621#ifdef CONFIG_COMPAT 1622long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1623{ 1624 /* These are just misnamed, they actually get/put from/to user an int */ 1625 switch (cmd) { 1626 case EXT4_IOC32_GETVERSION: 1627 cmd = EXT4_IOC_GETVERSION; 1628 break; 1629 case EXT4_IOC32_SETVERSION: 1630 cmd = EXT4_IOC_SETVERSION; 1631 break; 1632 case EXT4_IOC32_GROUP_EXTEND: 1633 cmd = EXT4_IOC_GROUP_EXTEND; 1634 break; 1635 case EXT4_IOC32_GETVERSION_OLD: 1636 cmd = EXT4_IOC_GETVERSION_OLD; 1637 break; 1638 case EXT4_IOC32_SETVERSION_OLD: 1639 cmd = EXT4_IOC_SETVERSION_OLD; 1640 break; 1641 case EXT4_IOC32_GETRSVSZ: 1642 cmd = EXT4_IOC_GETRSVSZ; 1643 break; 1644 case EXT4_IOC32_SETRSVSZ: 1645 cmd = EXT4_IOC_SETRSVSZ; 1646 break; 1647 case EXT4_IOC32_GROUP_ADD: { 1648 struct compat_ext4_new_group_input __user *uinput; 1649 struct ext4_new_group_data input; 1650 int err; 1651 1652 uinput = compat_ptr(arg); 1653 err = get_user(input.group, &uinput->group); 1654 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 1655 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 1656 err |= get_user(input.inode_table, &uinput->inode_table); 1657 err |= get_user(input.blocks_count, &uinput->blocks_count); 1658 err |= get_user(input.reserved_blocks, 1659 &uinput->reserved_blocks); 1660 if (err) 1661 return -EFAULT; 1662 return ext4_ioctl_group_add(file, &input); 1663 } 1664 case EXT4_IOC_MOVE_EXT: 1665 case EXT4_IOC_RESIZE_FS: 1666 case FITRIM: 1667 case EXT4_IOC_PRECACHE_EXTENTS: 1668 case FS_IOC_SET_ENCRYPTION_POLICY: 1669 case FS_IOC_GET_ENCRYPTION_PWSALT: 1670 case FS_IOC_GET_ENCRYPTION_POLICY: 1671 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1672 case FS_IOC_ADD_ENCRYPTION_KEY: 1673 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1674 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1675 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1676 case FS_IOC_GET_ENCRYPTION_NONCE: 1677 case EXT4_IOC_SHUTDOWN: 1678 case FS_IOC_GETFSMAP: 1679 case FS_IOC_ENABLE_VERITY: 1680 case FS_IOC_MEASURE_VERITY: 1681 case FS_IOC_READ_VERITY_METADATA: 1682 case EXT4_IOC_CLEAR_ES_CACHE: 1683 case EXT4_IOC_GETSTATE: 1684 case EXT4_IOC_GET_ES_CACHE: 1685 case EXT4_IOC_CHECKPOINT: 1686 case FS_IOC_GETFSLABEL: 1687 case FS_IOC_SETFSLABEL: 1688 case EXT4_IOC_GETFSUUID: 1689 case EXT4_IOC_SETFSUUID: 1690 break; 1691 default: 1692 return -ENOIOCTLCMD; 1693 } 1694 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 1695} 1696#endif 1697 1698static void set_overhead(struct ext4_super_block *es, const void *arg) 1699{ 1700 es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg)); 1701} 1702 1703int ext4_update_overhead(struct super_block *sb, bool force) 1704{ 1705 struct ext4_sb_info *sbi = EXT4_SB(sb); 1706 1707 if (sb_rdonly(sb)) 1708 return 0; 1709 if (!force && 1710 (sbi->s_overhead == 0 || 1711 sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters))) 1712 return 0; 1713 return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead); 1714} 1715