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 */ ext4_sb_setlabel(struct ext4_super_block * es,const void * arg)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 */ ext4_sb_setuuid(struct ext4_super_block * es,const void * arg)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 ext4_update_primary_sb(struct super_block * sb,handle_t * handle,ext4_update_sb_callback func,const void * arg)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 */ ext4_update_backup_sb(struct super_block * sb,handle_t * handle,ext4_group_t grp,ext4_update_sb_callback func,const void * arg)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 ext4_update_superblocks_fn(struct super_block * sb,ext4_update_sb_callback func,const void * arg)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 */ memswap(void * a,void * b,size_t len)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 */ swap_inode_data(struct inode * inode1,struct inode * inode2)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 struct timespec64 ts1, ts2; 316 317 ei1 = EXT4_I(inode1); 318 ei2 = EXT4_I(inode2); 319 320 swap(inode1->i_version, inode2->i_version); 321 322 ts1 = inode_get_atime(inode1); 323 ts2 = inode_get_atime(inode2); 324 inode_set_atime_to_ts(inode1, ts2); 325 inode_set_atime_to_ts(inode2, ts1); 326 327 ts1 = inode_get_mtime(inode1); 328 ts2 = inode_get_mtime(inode2); 329 inode_set_mtime_to_ts(inode1, ts2); 330 inode_set_mtime_to_ts(inode2, ts1); 331 332 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data)); 333 tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP; 334 ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) | 335 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP); 336 ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP); 337 swap(ei1->i_disksize, ei2->i_disksize); 338 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); 339 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); 340 341 isize = i_size_read(inode1); 342 i_size_write(inode1, i_size_read(inode2)); 343 i_size_write(inode2, isize); 344 } 345 ext4_reset_inode_seed(struct inode * inode)346 void ext4_reset_inode_seed(struct inode *inode) 347 { 348 struct ext4_inode_info *ei = EXT4_I(inode); 349 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); 350 __le32 inum = cpu_to_le32(inode->i_ino); 351 __le32 gen = cpu_to_le32(inode->i_generation); 352 __u32 csum; 353 354 if (!ext4_has_metadata_csum(inode->i_sb)) 355 return; 356 357 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)&inum, sizeof(inum)); 358 ei->i_csum_seed = ext4_chksum(sbi, csum, (__u8 *)&gen, sizeof(gen)); 359 } 360 361 /* 362 * Swap the information from the given @inode and the inode 363 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other 364 * important fields of the inodes. 365 * 366 * @sb: the super block of the filesystem 367 * @idmap: idmap of the mount the inode was found from 368 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO 369 * 370 */ swap_inode_boot_loader(struct super_block * sb,struct mnt_idmap * idmap,struct inode * inode)371 static long swap_inode_boot_loader(struct super_block *sb, 372 struct mnt_idmap *idmap, 373 struct inode *inode) 374 { 375 handle_t *handle; 376 int err; 377 struct inode *inode_bl; 378 struct ext4_inode_info *ei_bl; 379 qsize_t size, size_bl, diff; 380 blkcnt_t blocks; 381 unsigned short bytes; 382 383 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, 384 EXT4_IGET_SPECIAL | EXT4_IGET_BAD); 385 if (IS_ERR(inode_bl)) 386 return PTR_ERR(inode_bl); 387 ei_bl = EXT4_I(inode_bl); 388 389 /* Protect orig inodes against a truncate and make sure, 390 * that only 1 swap_inode_boot_loader is running. */ 391 lock_two_nondirectories(inode, inode_bl); 392 393 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode) || 394 IS_SWAPFILE(inode) || IS_ENCRYPTED(inode) || 395 (EXT4_I(inode)->i_flags & EXT4_JOURNAL_DATA_FL) || 396 ext4_has_inline_data(inode)) { 397 err = -EINVAL; 398 goto journal_err_out; 399 } 400 401 if (IS_RDONLY(inode) || IS_APPEND(inode) || IS_IMMUTABLE(inode) || 402 !inode_owner_or_capable(idmap, inode) || 403 !capable(CAP_SYS_ADMIN)) { 404 err = -EPERM; 405 goto journal_err_out; 406 } 407 408 filemap_invalidate_lock(inode->i_mapping); 409 err = filemap_write_and_wait(inode->i_mapping); 410 if (err) 411 goto err_out; 412 413 err = filemap_write_and_wait(inode_bl->i_mapping); 414 if (err) 415 goto err_out; 416 417 /* Wait for all existing dio workers */ 418 inode_dio_wait(inode); 419 inode_dio_wait(inode_bl); 420 421 truncate_inode_pages(&inode->i_data, 0); 422 truncate_inode_pages(&inode_bl->i_data, 0); 423 424 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2); 425 if (IS_ERR(handle)) { 426 err = -EINVAL; 427 goto err_out; 428 } 429 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_SWAP_BOOT, handle); 430 431 /* Protect extent tree against block allocations via delalloc */ 432 ext4_double_down_write_data_sem(inode, inode_bl); 433 434 if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) { 435 /* this inode has never been used as a BOOT_LOADER */ 436 set_nlink(inode_bl, 1); 437 i_uid_write(inode_bl, 0); 438 i_gid_write(inode_bl, 0); 439 inode_bl->i_flags = 0; 440 ei_bl->i_flags = 0; 441 inode_set_iversion(inode_bl, 1); 442 i_size_write(inode_bl, 0); 443 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size; 444 inode_bl->i_mode = S_IFREG; 445 if (ext4_has_feature_extents(sb)) { 446 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS); 447 ext4_ext_tree_init(handle, inode_bl); 448 } else 449 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); 450 } 451 452 err = dquot_initialize(inode); 453 if (err) 454 goto err_out1; 455 456 size = (qsize_t)(inode->i_blocks) * (1 << 9) + inode->i_bytes; 457 size_bl = (qsize_t)(inode_bl->i_blocks) * (1 << 9) + inode_bl->i_bytes; 458 diff = size - size_bl; 459 swap_inode_data(inode, inode_bl); 460 461 inode_set_ctime_current(inode); 462 inode_set_ctime_current(inode_bl); 463 inode_inc_iversion(inode); 464 465 inode->i_generation = get_random_u32(); 466 inode_bl->i_generation = get_random_u32(); 467 ext4_reset_inode_seed(inode); 468 ext4_reset_inode_seed(inode_bl); 469 470 ext4_discard_preallocations(inode, 0); 471 472 err = ext4_mark_inode_dirty(handle, inode); 473 if (err < 0) { 474 /* No need to update quota information. */ 475 ext4_warning(inode->i_sb, 476 "couldn't mark inode #%lu dirty (err %d)", 477 inode->i_ino, err); 478 /* Revert all changes: */ 479 swap_inode_data(inode, inode_bl); 480 ext4_mark_inode_dirty(handle, inode); 481 goto err_out1; 482 } 483 484 blocks = inode_bl->i_blocks; 485 bytes = inode_bl->i_bytes; 486 inode_bl->i_blocks = inode->i_blocks; 487 inode_bl->i_bytes = inode->i_bytes; 488 err = ext4_mark_inode_dirty(handle, inode_bl); 489 if (err < 0) { 490 /* No need to update quota information. */ 491 ext4_warning(inode_bl->i_sb, 492 "couldn't mark inode #%lu dirty (err %d)", 493 inode_bl->i_ino, err); 494 goto revert; 495 } 496 497 /* Bootloader inode should not be counted into quota information. */ 498 if (diff > 0) 499 dquot_free_space(inode, diff); 500 else 501 err = dquot_alloc_space(inode, -1 * diff); 502 503 if (err < 0) { 504 revert: 505 /* Revert all changes: */ 506 inode_bl->i_blocks = blocks; 507 inode_bl->i_bytes = bytes; 508 swap_inode_data(inode, inode_bl); 509 ext4_mark_inode_dirty(handle, inode); 510 ext4_mark_inode_dirty(handle, inode_bl); 511 } 512 513 err_out1: 514 ext4_journal_stop(handle); 515 ext4_double_up_write_data_sem(inode, inode_bl); 516 517 err_out: 518 filemap_invalidate_unlock(inode->i_mapping); 519 journal_err_out: 520 unlock_two_nondirectories(inode, inode_bl); 521 iput(inode_bl); 522 return err; 523 } 524 525 /* 526 * If immutable is set and we are not clearing it, we're not allowed to change 527 * anything else in the inode. Don't error out if we're only trying to set 528 * immutable on an immutable file. 529 */ ext4_ioctl_check_immutable(struct inode * inode,__u32 new_projid,unsigned int flags)530 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid, 531 unsigned int flags) 532 { 533 struct ext4_inode_info *ei = EXT4_I(inode); 534 unsigned int oldflags = ei->i_flags; 535 536 if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL)) 537 return 0; 538 539 if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL)) 540 return -EPERM; 541 if (ext4_has_feature_project(inode->i_sb) && 542 __kprojid_val(ei->i_projid) != new_projid) 543 return -EPERM; 544 545 return 0; 546 } 547 ext4_dax_dontcache(struct inode * inode,unsigned int flags)548 static void ext4_dax_dontcache(struct inode *inode, unsigned int flags) 549 { 550 struct ext4_inode_info *ei = EXT4_I(inode); 551 552 if (S_ISDIR(inode->i_mode)) 553 return; 554 555 if (test_opt2(inode->i_sb, DAX_NEVER) || 556 test_opt(inode->i_sb, DAX_ALWAYS)) 557 return; 558 559 if ((ei->i_flags ^ flags) & EXT4_DAX_FL) 560 d_mark_dontcache(inode); 561 } 562 dax_compatible(struct inode * inode,unsigned int oldflags,unsigned int flags)563 static bool dax_compatible(struct inode *inode, unsigned int oldflags, 564 unsigned int flags) 565 { 566 /* Allow the DAX flag to be changed on inline directories */ 567 if (S_ISDIR(inode->i_mode)) { 568 flags &= ~EXT4_INLINE_DATA_FL; 569 oldflags &= ~EXT4_INLINE_DATA_FL; 570 } 571 572 if (flags & EXT4_DAX_FL) { 573 if ((oldflags & EXT4_DAX_MUT_EXCL) || 574 ext4_test_inode_state(inode, 575 EXT4_STATE_VERITY_IN_PROGRESS)) { 576 return false; 577 } 578 } 579 580 if ((flags & EXT4_DAX_MUT_EXCL) && (oldflags & EXT4_DAX_FL)) 581 return false; 582 583 return true; 584 } 585 ext4_ioctl_setflags(struct inode * inode,unsigned int flags)586 static int ext4_ioctl_setflags(struct inode *inode, 587 unsigned int flags) 588 { 589 struct ext4_inode_info *ei = EXT4_I(inode); 590 handle_t *handle = NULL; 591 int err = -EPERM, migrate = 0; 592 struct ext4_iloc iloc; 593 unsigned int oldflags, mask, i; 594 struct super_block *sb = inode->i_sb; 595 596 /* Is it quota file? Do not allow user to mess with it */ 597 if (ext4_is_quota_file(inode)) 598 goto flags_out; 599 600 oldflags = ei->i_flags; 601 /* 602 * The JOURNAL_DATA flag can only be changed by 603 * the relevant capability. 604 */ 605 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 606 if (!capable(CAP_SYS_RESOURCE)) 607 goto flags_out; 608 } 609 610 if (!dax_compatible(inode, oldflags, flags)) { 611 err = -EOPNOTSUPP; 612 goto flags_out; 613 } 614 615 if ((flags ^ oldflags) & EXT4_EXTENTS_FL) 616 migrate = 1; 617 618 if ((flags ^ oldflags) & EXT4_CASEFOLD_FL) { 619 if (!ext4_has_feature_casefold(sb)) { 620 err = -EOPNOTSUPP; 621 goto flags_out; 622 } 623 624 if (!S_ISDIR(inode->i_mode)) { 625 err = -ENOTDIR; 626 goto flags_out; 627 } 628 629 if (!ext4_empty_dir(inode)) { 630 err = -ENOTEMPTY; 631 goto flags_out; 632 } 633 } 634 635 /* 636 * Wait for all pending directio and then flush all the dirty pages 637 * for this file. The flush marks all the pages readonly, so any 638 * subsequent attempt to write to the file (particularly mmap pages) 639 * will come through the filesystem and fail. 640 */ 641 if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) && 642 (flags & EXT4_IMMUTABLE_FL)) { 643 inode_dio_wait(inode); 644 err = filemap_write_and_wait(inode->i_mapping); 645 if (err) 646 goto flags_out; 647 } 648 649 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 650 if (IS_ERR(handle)) { 651 err = PTR_ERR(handle); 652 goto flags_out; 653 } 654 if (IS_SYNC(inode)) 655 ext4_handle_sync(handle); 656 err = ext4_reserve_inode_write(handle, inode, &iloc); 657 if (err) 658 goto flags_err; 659 660 ext4_dax_dontcache(inode, flags); 661 662 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 663 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 664 continue; 665 /* These flags get special treatment later */ 666 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL) 667 continue; 668 if (mask & flags) 669 ext4_set_inode_flag(inode, i); 670 else 671 ext4_clear_inode_flag(inode, i); 672 } 673 674 ext4_set_inode_flags(inode, false); 675 676 inode_set_ctime_current(inode); 677 inode_inc_iversion(inode); 678 679 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 680 flags_err: 681 ext4_journal_stop(handle); 682 if (err) 683 goto flags_out; 684 685 if ((flags ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 686 /* 687 * Changes to the journaling mode can cause unsafe changes to 688 * S_DAX if the inode is DAX 689 */ 690 if (IS_DAX(inode)) { 691 err = -EBUSY; 692 goto flags_out; 693 } 694 695 err = ext4_change_inode_journal_flag(inode, 696 flags & EXT4_JOURNAL_DATA_FL); 697 if (err) 698 goto flags_out; 699 } 700 if (migrate) { 701 if (flags & EXT4_EXTENTS_FL) 702 err = ext4_ext_migrate(inode); 703 else 704 err = ext4_ind_migrate(inode); 705 } 706 707 flags_out: 708 return err; 709 } 710 711 #ifdef CONFIG_QUOTA ext4_ioctl_setproject(struct inode * inode,__u32 projid)712 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 713 { 714 struct super_block *sb = inode->i_sb; 715 struct ext4_inode_info *ei = EXT4_I(inode); 716 int err, rc; 717 handle_t *handle; 718 kprojid_t kprojid; 719 struct ext4_iloc iloc; 720 struct ext4_inode *raw_inode; 721 struct dquot *transfer_to[MAXQUOTAS] = { }; 722 723 if (!ext4_has_feature_project(sb)) { 724 if (projid != EXT4_DEF_PROJID) 725 return -EOPNOTSUPP; 726 else 727 return 0; 728 } 729 730 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE) 731 return -EOPNOTSUPP; 732 733 kprojid = make_kprojid(&init_user_ns, (projid_t)projid); 734 735 if (projid_eq(kprojid, EXT4_I(inode)->i_projid)) 736 return 0; 737 738 err = -EPERM; 739 /* Is it quota file? Do not allow user to mess with it */ 740 if (ext4_is_quota_file(inode)) 741 return err; 742 743 err = dquot_initialize(inode); 744 if (err) 745 return err; 746 747 err = ext4_get_inode_loc(inode, &iloc); 748 if (err) 749 return err; 750 751 raw_inode = ext4_raw_inode(&iloc); 752 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 753 err = ext4_expand_extra_isize(inode, 754 EXT4_SB(sb)->s_want_extra_isize, 755 &iloc); 756 if (err) 757 return err; 758 } else { 759 brelse(iloc.bh); 760 } 761 762 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 763 EXT4_QUOTA_INIT_BLOCKS(sb) + 764 EXT4_QUOTA_DEL_BLOCKS(sb) + 3); 765 if (IS_ERR(handle)) 766 return PTR_ERR(handle); 767 768 err = ext4_reserve_inode_write(handle, inode, &iloc); 769 if (err) 770 goto out_stop; 771 772 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid)); 773 if (!IS_ERR(transfer_to[PRJQUOTA])) { 774 775 /* __dquot_transfer() calls back ext4_get_inode_usage() which 776 * counts xattr inode references. 777 */ 778 down_read(&EXT4_I(inode)->xattr_sem); 779 err = __dquot_transfer(inode, transfer_to); 780 up_read(&EXT4_I(inode)->xattr_sem); 781 dqput(transfer_to[PRJQUOTA]); 782 if (err) 783 goto out_dirty; 784 } 785 786 EXT4_I(inode)->i_projid = kprojid; 787 inode_set_ctime_current(inode); 788 inode_inc_iversion(inode); 789 out_dirty: 790 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 791 if (!err) 792 err = rc; 793 out_stop: 794 ext4_journal_stop(handle); 795 return err; 796 } 797 #else ext4_ioctl_setproject(struct inode * inode,__u32 projid)798 static int ext4_ioctl_setproject(struct inode *inode, __u32 projid) 799 { 800 if (projid != EXT4_DEF_PROJID) 801 return -EOPNOTSUPP; 802 return 0; 803 } 804 #endif 805 ext4_force_shutdown(struct super_block * sb,u32 flags)806 int ext4_force_shutdown(struct super_block *sb, u32 flags) 807 { 808 struct ext4_sb_info *sbi = EXT4_SB(sb); 809 int ret; 810 811 if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH) 812 return -EINVAL; 813 814 if (ext4_forced_shutdown(sb)) 815 return 0; 816 817 ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags); 818 trace_ext4_shutdown(sb, flags); 819 820 switch (flags) { 821 case EXT4_GOING_FLAGS_DEFAULT: 822 ret = freeze_bdev(sb->s_bdev); 823 if (ret) 824 return ret; 825 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 826 thaw_bdev(sb->s_bdev); 827 break; 828 case EXT4_GOING_FLAGS_LOGFLUSH: 829 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 830 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) { 831 (void) ext4_force_commit(sb); 832 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 833 } 834 break; 835 case EXT4_GOING_FLAGS_NOLOGFLUSH: 836 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags); 837 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) 838 jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN); 839 break; 840 default: 841 return -EINVAL; 842 } 843 clear_opt(sb, DISCARD); 844 return 0; 845 } 846 ext4_ioctl_shutdown(struct super_block * sb,unsigned long arg)847 static int ext4_ioctl_shutdown(struct super_block *sb, unsigned long arg) 848 { 849 u32 flags; 850 851 if (!capable(CAP_SYS_ADMIN)) 852 return -EPERM; 853 854 if (get_user(flags, (__u32 __user *)arg)) 855 return -EFAULT; 856 857 return ext4_force_shutdown(sb, flags); 858 } 859 860 struct getfsmap_info { 861 struct super_block *gi_sb; 862 struct fsmap_head __user *gi_data; 863 unsigned int gi_idx; 864 __u32 gi_last_flags; 865 }; 866 ext4_getfsmap_format(struct ext4_fsmap * xfm,void * priv)867 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv) 868 { 869 struct getfsmap_info *info = priv; 870 struct fsmap fm; 871 872 trace_ext4_getfsmap_mapping(info->gi_sb, xfm); 873 874 info->gi_last_flags = xfm->fmr_flags; 875 ext4_fsmap_from_internal(info->gi_sb, &fm, xfm); 876 if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm, 877 sizeof(struct fsmap))) 878 return -EFAULT; 879 880 return 0; 881 } 882 ext4_ioc_getfsmap(struct super_block * sb,struct fsmap_head __user * arg)883 static int ext4_ioc_getfsmap(struct super_block *sb, 884 struct fsmap_head __user *arg) 885 { 886 struct getfsmap_info info = { NULL }; 887 struct ext4_fsmap_head xhead = {0}; 888 struct fsmap_head head; 889 bool aborted = false; 890 int error; 891 892 if (copy_from_user(&head, arg, sizeof(struct fsmap_head))) 893 return -EFAULT; 894 if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) || 895 memchr_inv(head.fmh_keys[0].fmr_reserved, 0, 896 sizeof(head.fmh_keys[0].fmr_reserved)) || 897 memchr_inv(head.fmh_keys[1].fmr_reserved, 0, 898 sizeof(head.fmh_keys[1].fmr_reserved))) 899 return -EINVAL; 900 /* 901 * ext4 doesn't report file extents at all, so the only valid 902 * file offsets are the magic ones (all zeroes or all ones). 903 */ 904 if (head.fmh_keys[0].fmr_offset || 905 (head.fmh_keys[1].fmr_offset != 0 && 906 head.fmh_keys[1].fmr_offset != -1ULL)) 907 return -EINVAL; 908 909 xhead.fmh_iflags = head.fmh_iflags; 910 xhead.fmh_count = head.fmh_count; 911 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]); 912 ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]); 913 914 trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]); 915 trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]); 916 917 info.gi_sb = sb; 918 info.gi_data = arg; 919 error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info); 920 if (error == EXT4_QUERY_RANGE_ABORT) 921 aborted = true; 922 else if (error) 923 return error; 924 925 /* If we didn't abort, set the "last" flag in the last fmx */ 926 if (!aborted && info.gi_idx) { 927 info.gi_last_flags |= FMR_OF_LAST; 928 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags, 929 &info.gi_last_flags, 930 sizeof(info.gi_last_flags))) 931 return -EFAULT; 932 } 933 934 /* copy back header */ 935 head.fmh_entries = xhead.fmh_entries; 936 head.fmh_oflags = xhead.fmh_oflags; 937 if (copy_to_user(arg, &head, sizeof(struct fsmap_head))) 938 return -EFAULT; 939 940 return 0; 941 } 942 ext4_ioctl_group_add(struct file * file,struct ext4_new_group_data * input)943 static long ext4_ioctl_group_add(struct file *file, 944 struct ext4_new_group_data *input) 945 { 946 struct super_block *sb = file_inode(file)->i_sb; 947 int err, err2=0; 948 949 err = ext4_resize_begin(sb); 950 if (err) 951 return err; 952 953 if (ext4_has_feature_bigalloc(sb)) { 954 ext4_msg(sb, KERN_ERR, 955 "Online resizing not supported with bigalloc"); 956 err = -EOPNOTSUPP; 957 goto group_add_out; 958 } 959 960 err = mnt_want_write_file(file); 961 if (err) 962 goto group_add_out; 963 964 err = ext4_group_add(sb, input); 965 if (EXT4_SB(sb)->s_journal) { 966 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 967 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 968 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 969 } 970 if (err == 0) 971 err = err2; 972 mnt_drop_write_file(file); 973 if (!err && ext4_has_group_desc_csum(sb) && 974 test_opt(sb, INIT_INODE_TABLE)) 975 err = ext4_register_li_request(sb, input->group); 976 group_add_out: 977 err2 = ext4_resize_end(sb, false); 978 if (err == 0) 979 err = err2; 980 return err; 981 } 982 ext4_fileattr_get(struct dentry * dentry,struct fileattr * fa)983 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa) 984 { 985 struct inode *inode = d_inode(dentry); 986 struct ext4_inode_info *ei = EXT4_I(inode); 987 u32 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 988 989 if (S_ISREG(inode->i_mode)) 990 flags &= ~FS_PROJINHERIT_FL; 991 992 fileattr_fill_flags(fa, flags); 993 if (ext4_has_feature_project(inode->i_sb)) 994 fa->fsx_projid = from_kprojid(&init_user_ns, ei->i_projid); 995 996 return 0; 997 } 998 ext4_fileattr_set(struct mnt_idmap * idmap,struct dentry * dentry,struct fileattr * fa)999 int ext4_fileattr_set(struct mnt_idmap *idmap, 1000 struct dentry *dentry, struct fileattr *fa) 1001 { 1002 struct inode *inode = d_inode(dentry); 1003 u32 flags = fa->flags; 1004 int err = -EOPNOTSUPP; 1005 1006 if (flags & ~EXT4_FL_USER_VISIBLE) 1007 goto out; 1008 1009 /* 1010 * chattr(1) grabs flags via GETFLAGS, modifies the result and 1011 * passes that to SETFLAGS. So we cannot easily make SETFLAGS 1012 * more restrictive than just silently masking off visible but 1013 * not settable flags as we always did. 1014 */ 1015 flags &= EXT4_FL_USER_MODIFIABLE; 1016 if (ext4_mask_flags(inode->i_mode, flags) != flags) 1017 goto out; 1018 err = ext4_ioctl_check_immutable(inode, fa->fsx_projid, flags); 1019 if (err) 1020 goto out; 1021 err = ext4_ioctl_setflags(inode, flags); 1022 if (err) 1023 goto out; 1024 err = ext4_ioctl_setproject(inode, fa->fsx_projid); 1025 out: 1026 return err; 1027 } 1028 1029 /* So that the fiemap access checks can't overflow on 32 bit machines. */ 1030 #define FIEMAP_MAX_EXTENTS (UINT_MAX / sizeof(struct fiemap_extent)) 1031 ext4_ioctl_get_es_cache(struct file * filp,unsigned long arg)1032 static int ext4_ioctl_get_es_cache(struct file *filp, unsigned long arg) 1033 { 1034 struct fiemap fiemap; 1035 struct fiemap __user *ufiemap = (struct fiemap __user *) arg; 1036 struct fiemap_extent_info fieinfo = { 0, }; 1037 struct inode *inode = file_inode(filp); 1038 int error; 1039 1040 if (copy_from_user(&fiemap, ufiemap, sizeof(fiemap))) 1041 return -EFAULT; 1042 1043 if (fiemap.fm_extent_count > FIEMAP_MAX_EXTENTS) 1044 return -EINVAL; 1045 1046 fieinfo.fi_flags = fiemap.fm_flags; 1047 fieinfo.fi_extents_max = fiemap.fm_extent_count; 1048 fieinfo.fi_extents_start = ufiemap->fm_extents; 1049 1050 error = ext4_get_es_cache(inode, &fieinfo, fiemap.fm_start, 1051 fiemap.fm_length); 1052 fiemap.fm_flags = fieinfo.fi_flags; 1053 fiemap.fm_mapped_extents = fieinfo.fi_extents_mapped; 1054 if (copy_to_user(ufiemap, &fiemap, sizeof(fiemap))) 1055 error = -EFAULT; 1056 1057 return error; 1058 } 1059 ext4_ioctl_checkpoint(struct file * filp,unsigned long arg)1060 static int ext4_ioctl_checkpoint(struct file *filp, unsigned long arg) 1061 { 1062 int err = 0; 1063 __u32 flags = 0; 1064 unsigned int flush_flags = 0; 1065 struct super_block *sb = file_inode(filp)->i_sb; 1066 1067 if (copy_from_user(&flags, (__u32 __user *)arg, 1068 sizeof(__u32))) 1069 return -EFAULT; 1070 1071 if (!capable(CAP_SYS_ADMIN)) 1072 return -EPERM; 1073 1074 /* check for invalid bits set */ 1075 if ((flags & ~EXT4_IOC_CHECKPOINT_FLAG_VALID) || 1076 ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1077 (flags & JBD2_JOURNAL_FLUSH_ZEROOUT))) 1078 return -EINVAL; 1079 1080 if (!EXT4_SB(sb)->s_journal) 1081 return -ENODEV; 1082 1083 if ((flags & JBD2_JOURNAL_FLUSH_DISCARD) && 1084 !bdev_max_discard_sectors(EXT4_SB(sb)->s_journal->j_dev)) 1085 return -EOPNOTSUPP; 1086 1087 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN) 1088 return 0; 1089 1090 if (flags & EXT4_IOC_CHECKPOINT_FLAG_DISCARD) 1091 flush_flags |= JBD2_JOURNAL_FLUSH_DISCARD; 1092 1093 if (flags & EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT) { 1094 flush_flags |= JBD2_JOURNAL_FLUSH_ZEROOUT; 1095 pr_info_ratelimited("warning: checkpointing journal with EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT can be slow"); 1096 } 1097 1098 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1099 err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, flush_flags); 1100 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1101 1102 return err; 1103 } 1104 ext4_ioctl_setlabel(struct file * filp,const char __user * user_label)1105 static int ext4_ioctl_setlabel(struct file *filp, const char __user *user_label) 1106 { 1107 size_t len; 1108 int ret = 0; 1109 char new_label[EXT4_LABEL_MAX + 1]; 1110 struct super_block *sb = file_inode(filp)->i_sb; 1111 1112 if (!capable(CAP_SYS_ADMIN)) 1113 return -EPERM; 1114 1115 /* 1116 * Copy the maximum length allowed for ext4 label with one more to 1117 * find the required terminating null byte in order to test the 1118 * label length. The on disk label doesn't need to be null terminated. 1119 */ 1120 if (copy_from_user(new_label, user_label, EXT4_LABEL_MAX + 1)) 1121 return -EFAULT; 1122 1123 len = strnlen(new_label, EXT4_LABEL_MAX + 1); 1124 if (len > EXT4_LABEL_MAX) 1125 return -EINVAL; 1126 1127 /* 1128 * Clear the buffer after the new label 1129 */ 1130 memset(new_label + len, 0, EXT4_LABEL_MAX - len); 1131 1132 ret = mnt_want_write_file(filp); 1133 if (ret) 1134 return ret; 1135 1136 ret = ext4_update_superblocks_fn(sb, ext4_sb_setlabel, new_label); 1137 1138 mnt_drop_write_file(filp); 1139 return ret; 1140 } 1141 ext4_ioctl_getlabel(struct ext4_sb_info * sbi,char __user * user_label)1142 static int ext4_ioctl_getlabel(struct ext4_sb_info *sbi, char __user *user_label) 1143 { 1144 char label[EXT4_LABEL_MAX + 1]; 1145 1146 /* 1147 * EXT4_LABEL_MAX must always be smaller than FSLABEL_MAX because 1148 * FSLABEL_MAX must include terminating null byte, while s_volume_name 1149 * does not have to. 1150 */ 1151 BUILD_BUG_ON(EXT4_LABEL_MAX >= FSLABEL_MAX); 1152 1153 memset(label, 0, sizeof(label)); 1154 lock_buffer(sbi->s_sbh); 1155 strncpy(label, sbi->s_es->s_volume_name, EXT4_LABEL_MAX); 1156 unlock_buffer(sbi->s_sbh); 1157 1158 if (copy_to_user(user_label, label, sizeof(label))) 1159 return -EFAULT; 1160 return 0; 1161 } 1162 ext4_ioctl_getuuid(struct ext4_sb_info * sbi,struct fsuuid __user * ufsuuid)1163 static int ext4_ioctl_getuuid(struct ext4_sb_info *sbi, 1164 struct fsuuid __user *ufsuuid) 1165 { 1166 struct fsuuid fsuuid; 1167 __u8 uuid[UUID_SIZE]; 1168 1169 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1170 return -EFAULT; 1171 1172 if (fsuuid.fsu_len == 0) { 1173 fsuuid.fsu_len = UUID_SIZE; 1174 if (copy_to_user(&ufsuuid->fsu_len, &fsuuid.fsu_len, 1175 sizeof(fsuuid.fsu_len))) 1176 return -EFAULT; 1177 return 0; 1178 } 1179 1180 if (fsuuid.fsu_len < UUID_SIZE || fsuuid.fsu_flags != 0) 1181 return -EINVAL; 1182 1183 lock_buffer(sbi->s_sbh); 1184 memcpy(uuid, sbi->s_es->s_uuid, UUID_SIZE); 1185 unlock_buffer(sbi->s_sbh); 1186 1187 fsuuid.fsu_len = UUID_SIZE; 1188 if (copy_to_user(ufsuuid, &fsuuid, sizeof(fsuuid)) || 1189 copy_to_user(&ufsuuid->fsu_uuid[0], uuid, UUID_SIZE)) 1190 return -EFAULT; 1191 return 0; 1192 } 1193 ext4_ioctl_setuuid(struct file * filp,const struct fsuuid __user * ufsuuid)1194 static int ext4_ioctl_setuuid(struct file *filp, 1195 const struct fsuuid __user *ufsuuid) 1196 { 1197 int ret = 0; 1198 struct super_block *sb = file_inode(filp)->i_sb; 1199 struct fsuuid fsuuid; 1200 __u8 uuid[UUID_SIZE]; 1201 1202 if (!capable(CAP_SYS_ADMIN)) 1203 return -EPERM; 1204 1205 /* 1206 * If any checksums (group descriptors or metadata) are being used 1207 * then the checksum seed feature is required to change the UUID. 1208 */ 1209 if (((ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb)) 1210 && !ext4_has_feature_csum_seed(sb)) 1211 || ext4_has_feature_stable_inodes(sb)) 1212 return -EOPNOTSUPP; 1213 1214 if (copy_from_user(&fsuuid, ufsuuid, sizeof(fsuuid))) 1215 return -EFAULT; 1216 1217 if (fsuuid.fsu_len != UUID_SIZE || fsuuid.fsu_flags != 0) 1218 return -EINVAL; 1219 1220 if (copy_from_user(uuid, &ufsuuid->fsu_uuid[0], UUID_SIZE)) 1221 return -EFAULT; 1222 1223 ret = mnt_want_write_file(filp); 1224 if (ret) 1225 return ret; 1226 1227 ret = ext4_update_superblocks_fn(sb, ext4_sb_setuuid, &uuid); 1228 mnt_drop_write_file(filp); 1229 1230 return ret; 1231 } 1232 __ext4_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1233 static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1234 { 1235 struct inode *inode = file_inode(filp); 1236 struct super_block *sb = inode->i_sb; 1237 struct mnt_idmap *idmap = file_mnt_idmap(filp); 1238 1239 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 1240 1241 switch (cmd) { 1242 case FS_IOC_GETFSMAP: 1243 return ext4_ioc_getfsmap(sb, (void __user *)arg); 1244 case EXT4_IOC_GETVERSION: 1245 case EXT4_IOC_GETVERSION_OLD: 1246 return put_user(inode->i_generation, (int __user *) arg); 1247 case EXT4_IOC_SETVERSION: 1248 case EXT4_IOC_SETVERSION_OLD: { 1249 handle_t *handle; 1250 struct ext4_iloc iloc; 1251 __u32 generation; 1252 int err; 1253 1254 if (!inode_owner_or_capable(idmap, inode)) 1255 return -EPERM; 1256 1257 if (ext4_has_metadata_csum(inode->i_sb)) { 1258 ext4_warning(sb, "Setting inode version is not " 1259 "supported with metadata_csum enabled."); 1260 return -ENOTTY; 1261 } 1262 1263 err = mnt_want_write_file(filp); 1264 if (err) 1265 return err; 1266 if (get_user(generation, (int __user *) arg)) { 1267 err = -EFAULT; 1268 goto setversion_out; 1269 } 1270 1271 inode_lock(inode); 1272 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 1273 if (IS_ERR(handle)) { 1274 err = PTR_ERR(handle); 1275 goto unlock_out; 1276 } 1277 err = ext4_reserve_inode_write(handle, inode, &iloc); 1278 if (err == 0) { 1279 inode_set_ctime_current(inode); 1280 inode_inc_iversion(inode); 1281 inode->i_generation = generation; 1282 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 1283 } 1284 ext4_journal_stop(handle); 1285 1286 unlock_out: 1287 inode_unlock(inode); 1288 setversion_out: 1289 mnt_drop_write_file(filp); 1290 return err; 1291 } 1292 case EXT4_IOC_GROUP_EXTEND: { 1293 ext4_fsblk_t n_blocks_count; 1294 int err, err2=0; 1295 1296 err = ext4_resize_begin(sb); 1297 if (err) 1298 return err; 1299 1300 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 1301 err = -EFAULT; 1302 goto group_extend_out; 1303 } 1304 1305 if (ext4_has_feature_bigalloc(sb)) { 1306 ext4_msg(sb, KERN_ERR, 1307 "Online resizing not supported with bigalloc"); 1308 err = -EOPNOTSUPP; 1309 goto group_extend_out; 1310 } 1311 1312 err = mnt_want_write_file(filp); 1313 if (err) 1314 goto group_extend_out; 1315 1316 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 1317 if (EXT4_SB(sb)->s_journal) { 1318 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1319 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1320 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1321 } 1322 if (err == 0) 1323 err = err2; 1324 mnt_drop_write_file(filp); 1325 group_extend_out: 1326 err2 = ext4_resize_end(sb, false); 1327 if (err == 0) 1328 err = err2; 1329 return err; 1330 } 1331 1332 case EXT4_IOC_MOVE_EXT: { 1333 struct move_extent me; 1334 struct fd donor; 1335 int err; 1336 1337 if (!(filp->f_mode & FMODE_READ) || 1338 !(filp->f_mode & FMODE_WRITE)) 1339 return -EBADF; 1340 1341 if (copy_from_user(&me, 1342 (struct move_extent __user *)arg, sizeof(me))) 1343 return -EFAULT; 1344 me.moved_len = 0; 1345 1346 donor = fdget(me.donor_fd); 1347 if (!donor.file) 1348 return -EBADF; 1349 1350 if (!(donor.file->f_mode & FMODE_WRITE)) { 1351 err = -EBADF; 1352 goto mext_out; 1353 } 1354 1355 if (ext4_has_feature_bigalloc(sb)) { 1356 ext4_msg(sb, KERN_ERR, 1357 "Online defrag not supported with bigalloc"); 1358 err = -EOPNOTSUPP; 1359 goto mext_out; 1360 } else if (IS_DAX(inode)) { 1361 ext4_msg(sb, KERN_ERR, 1362 "Online defrag not supported with DAX"); 1363 err = -EOPNOTSUPP; 1364 goto mext_out; 1365 } 1366 1367 err = mnt_want_write_file(filp); 1368 if (err) 1369 goto mext_out; 1370 1371 err = ext4_move_extents(filp, donor.file, me.orig_start, 1372 me.donor_start, me.len, &me.moved_len); 1373 mnt_drop_write_file(filp); 1374 1375 if (copy_to_user((struct move_extent __user *)arg, 1376 &me, sizeof(me))) 1377 err = -EFAULT; 1378 mext_out: 1379 fdput(donor); 1380 return err; 1381 } 1382 1383 case EXT4_IOC_GROUP_ADD: { 1384 struct ext4_new_group_data input; 1385 1386 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 1387 sizeof(input))) 1388 return -EFAULT; 1389 1390 return ext4_ioctl_group_add(filp, &input); 1391 } 1392 1393 case EXT4_IOC_MIGRATE: 1394 { 1395 int err; 1396 if (!inode_owner_or_capable(idmap, inode)) 1397 return -EACCES; 1398 1399 err = mnt_want_write_file(filp); 1400 if (err) 1401 return err; 1402 /* 1403 * inode_mutex prevent write and truncate on the file. 1404 * Read still goes through. We take i_data_sem in 1405 * ext4_ext_swap_inode_data before we switch the 1406 * inode format to prevent read. 1407 */ 1408 inode_lock((inode)); 1409 err = ext4_ext_migrate(inode); 1410 inode_unlock((inode)); 1411 mnt_drop_write_file(filp); 1412 return err; 1413 } 1414 1415 case EXT4_IOC_ALLOC_DA_BLKS: 1416 { 1417 int err; 1418 if (!inode_owner_or_capable(idmap, inode)) 1419 return -EACCES; 1420 1421 err = mnt_want_write_file(filp); 1422 if (err) 1423 return err; 1424 err = ext4_alloc_da_blocks(inode); 1425 mnt_drop_write_file(filp); 1426 return err; 1427 } 1428 1429 case EXT4_IOC_SWAP_BOOT: 1430 { 1431 int err; 1432 if (!(filp->f_mode & FMODE_WRITE)) 1433 return -EBADF; 1434 err = mnt_want_write_file(filp); 1435 if (err) 1436 return err; 1437 err = swap_inode_boot_loader(sb, idmap, inode); 1438 mnt_drop_write_file(filp); 1439 return err; 1440 } 1441 1442 case EXT4_IOC_RESIZE_FS: { 1443 ext4_fsblk_t n_blocks_count; 1444 int err = 0, err2 = 0; 1445 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 1446 1447 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 1448 sizeof(__u64))) { 1449 return -EFAULT; 1450 } 1451 1452 err = ext4_resize_begin(sb); 1453 if (err) 1454 return err; 1455 1456 err = mnt_want_write_file(filp); 1457 if (err) 1458 goto resizefs_out; 1459 1460 err = ext4_resize_fs(sb, n_blocks_count); 1461 if (EXT4_SB(sb)->s_journal) { 1462 ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE, NULL); 1463 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 1464 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, 0); 1465 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 1466 } 1467 if (err == 0) 1468 err = err2; 1469 mnt_drop_write_file(filp); 1470 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) && 1471 ext4_has_group_desc_csum(sb) && 1472 test_opt(sb, INIT_INODE_TABLE)) 1473 err = ext4_register_li_request(sb, o_group); 1474 1475 resizefs_out: 1476 err2 = ext4_resize_end(sb, true); 1477 if (err == 0) 1478 err = err2; 1479 return err; 1480 } 1481 1482 case FITRIM: 1483 { 1484 struct fstrim_range range; 1485 int ret = 0; 1486 1487 if (!capable(CAP_SYS_ADMIN)) 1488 return -EPERM; 1489 1490 if (!bdev_max_discard_sectors(sb->s_bdev)) 1491 return -EOPNOTSUPP; 1492 1493 /* 1494 * We haven't replayed the journal, so we cannot use our 1495 * block-bitmap-guided storage zapping commands. 1496 */ 1497 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb)) 1498 return -EROFS; 1499 1500 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 1501 sizeof(range))) 1502 return -EFAULT; 1503 1504 ret = ext4_trim_fs(sb, &range); 1505 if (ret < 0) 1506 return ret; 1507 1508 if (copy_to_user((struct fstrim_range __user *)arg, &range, 1509 sizeof(range))) 1510 return -EFAULT; 1511 1512 return 0; 1513 } 1514 case EXT4_IOC_PRECACHE_EXTENTS: 1515 return ext4_ext_precache(inode); 1516 1517 case FS_IOC_SET_ENCRYPTION_POLICY: 1518 if (!ext4_has_feature_encrypt(sb)) 1519 return -EOPNOTSUPP; 1520 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg); 1521 1522 case FS_IOC_GET_ENCRYPTION_PWSALT: 1523 return ext4_ioctl_get_encryption_pwsalt(filp, (void __user *)arg); 1524 1525 case FS_IOC_GET_ENCRYPTION_POLICY: 1526 if (!ext4_has_feature_encrypt(sb)) 1527 return -EOPNOTSUPP; 1528 return fscrypt_ioctl_get_policy(filp, (void __user *)arg); 1529 1530 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1531 if (!ext4_has_feature_encrypt(sb)) 1532 return -EOPNOTSUPP; 1533 return fscrypt_ioctl_get_policy_ex(filp, (void __user *)arg); 1534 1535 case FS_IOC_ADD_ENCRYPTION_KEY: 1536 if (!ext4_has_feature_encrypt(sb)) 1537 return -EOPNOTSUPP; 1538 return fscrypt_ioctl_add_key(filp, (void __user *)arg); 1539 1540 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1541 if (!ext4_has_feature_encrypt(sb)) 1542 return -EOPNOTSUPP; 1543 return fscrypt_ioctl_remove_key(filp, (void __user *)arg); 1544 1545 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1546 if (!ext4_has_feature_encrypt(sb)) 1547 return -EOPNOTSUPP; 1548 return fscrypt_ioctl_remove_key_all_users(filp, 1549 (void __user *)arg); 1550 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1551 if (!ext4_has_feature_encrypt(sb)) 1552 return -EOPNOTSUPP; 1553 return fscrypt_ioctl_get_key_status(filp, (void __user *)arg); 1554 1555 case FS_IOC_GET_ENCRYPTION_NONCE: 1556 if (!ext4_has_feature_encrypt(sb)) 1557 return -EOPNOTSUPP; 1558 return fscrypt_ioctl_get_nonce(filp, (void __user *)arg); 1559 1560 case EXT4_IOC_CLEAR_ES_CACHE: 1561 { 1562 if (!inode_owner_or_capable(idmap, inode)) 1563 return -EACCES; 1564 ext4_clear_inode_es(inode); 1565 return 0; 1566 } 1567 1568 case EXT4_IOC_GETSTATE: 1569 { 1570 __u32 state = 0; 1571 1572 if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) 1573 state |= EXT4_STATE_FLAG_EXT_PRECACHED; 1574 if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) 1575 state |= EXT4_STATE_FLAG_NEW; 1576 if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) 1577 state |= EXT4_STATE_FLAG_NEWENTRY; 1578 if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) 1579 state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; 1580 1581 return put_user(state, (__u32 __user *) arg); 1582 } 1583 1584 case EXT4_IOC_GET_ES_CACHE: 1585 return ext4_ioctl_get_es_cache(filp, arg); 1586 1587 case EXT4_IOC_SHUTDOWN: 1588 return ext4_ioctl_shutdown(sb, arg); 1589 1590 case FS_IOC_ENABLE_VERITY: 1591 if (!ext4_has_feature_verity(sb)) 1592 return -EOPNOTSUPP; 1593 return fsverity_ioctl_enable(filp, (const void __user *)arg); 1594 1595 case FS_IOC_MEASURE_VERITY: 1596 if (!ext4_has_feature_verity(sb)) 1597 return -EOPNOTSUPP; 1598 return fsverity_ioctl_measure(filp, (void __user *)arg); 1599 1600 case FS_IOC_READ_VERITY_METADATA: 1601 if (!ext4_has_feature_verity(sb)) 1602 return -EOPNOTSUPP; 1603 return fsverity_ioctl_read_metadata(filp, 1604 (const void __user *)arg); 1605 1606 case EXT4_IOC_CHECKPOINT: 1607 return ext4_ioctl_checkpoint(filp, arg); 1608 1609 case FS_IOC_GETFSLABEL: 1610 return ext4_ioctl_getlabel(EXT4_SB(sb), (void __user *)arg); 1611 1612 case FS_IOC_SETFSLABEL: 1613 return ext4_ioctl_setlabel(filp, 1614 (const void __user *)arg); 1615 1616 case EXT4_IOC_GETFSUUID: 1617 return ext4_ioctl_getuuid(EXT4_SB(sb), (void __user *)arg); 1618 case EXT4_IOC_SETFSUUID: 1619 return ext4_ioctl_setuuid(filp, (const void __user *)arg); 1620 default: 1621 return -ENOTTY; 1622 } 1623 } 1624 ext4_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)1625 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 1626 { 1627 return __ext4_ioctl(filp, cmd, arg); 1628 } 1629 1630 #ifdef CONFIG_COMPAT ext4_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)1631 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1632 { 1633 /* These are just misnamed, they actually get/put from/to user an int */ 1634 switch (cmd) { 1635 case EXT4_IOC32_GETVERSION: 1636 cmd = EXT4_IOC_GETVERSION; 1637 break; 1638 case EXT4_IOC32_SETVERSION: 1639 cmd = EXT4_IOC_SETVERSION; 1640 break; 1641 case EXT4_IOC32_GROUP_EXTEND: 1642 cmd = EXT4_IOC_GROUP_EXTEND; 1643 break; 1644 case EXT4_IOC32_GETVERSION_OLD: 1645 cmd = EXT4_IOC_GETVERSION_OLD; 1646 break; 1647 case EXT4_IOC32_SETVERSION_OLD: 1648 cmd = EXT4_IOC_SETVERSION_OLD; 1649 break; 1650 case EXT4_IOC32_GETRSVSZ: 1651 cmd = EXT4_IOC_GETRSVSZ; 1652 break; 1653 case EXT4_IOC32_SETRSVSZ: 1654 cmd = EXT4_IOC_SETRSVSZ; 1655 break; 1656 case EXT4_IOC32_GROUP_ADD: { 1657 struct compat_ext4_new_group_input __user *uinput; 1658 struct ext4_new_group_data input; 1659 int err; 1660 1661 uinput = compat_ptr(arg); 1662 err = get_user(input.group, &uinput->group); 1663 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 1664 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 1665 err |= get_user(input.inode_table, &uinput->inode_table); 1666 err |= get_user(input.blocks_count, &uinput->blocks_count); 1667 err |= get_user(input.reserved_blocks, 1668 &uinput->reserved_blocks); 1669 if (err) 1670 return -EFAULT; 1671 return ext4_ioctl_group_add(file, &input); 1672 } 1673 case EXT4_IOC_MOVE_EXT: 1674 case EXT4_IOC_RESIZE_FS: 1675 case FITRIM: 1676 case EXT4_IOC_PRECACHE_EXTENTS: 1677 case FS_IOC_SET_ENCRYPTION_POLICY: 1678 case FS_IOC_GET_ENCRYPTION_PWSALT: 1679 case FS_IOC_GET_ENCRYPTION_POLICY: 1680 case FS_IOC_GET_ENCRYPTION_POLICY_EX: 1681 case FS_IOC_ADD_ENCRYPTION_KEY: 1682 case FS_IOC_REMOVE_ENCRYPTION_KEY: 1683 case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: 1684 case FS_IOC_GET_ENCRYPTION_KEY_STATUS: 1685 case FS_IOC_GET_ENCRYPTION_NONCE: 1686 case EXT4_IOC_SHUTDOWN: 1687 case FS_IOC_GETFSMAP: 1688 case FS_IOC_ENABLE_VERITY: 1689 case FS_IOC_MEASURE_VERITY: 1690 case FS_IOC_READ_VERITY_METADATA: 1691 case EXT4_IOC_CLEAR_ES_CACHE: 1692 case EXT4_IOC_GETSTATE: 1693 case EXT4_IOC_GET_ES_CACHE: 1694 case EXT4_IOC_CHECKPOINT: 1695 case FS_IOC_GETFSLABEL: 1696 case FS_IOC_SETFSLABEL: 1697 case EXT4_IOC_GETFSUUID: 1698 case EXT4_IOC_SETFSUUID: 1699 break; 1700 default: 1701 return -ENOIOCTLCMD; 1702 } 1703 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 1704 } 1705 #endif 1706 set_overhead(struct ext4_super_block * es,const void * arg)1707 static void set_overhead(struct ext4_super_block *es, const void *arg) 1708 { 1709 es->s_overhead_clusters = cpu_to_le32(*((unsigned long *) arg)); 1710 } 1711 ext4_update_overhead(struct super_block * sb,bool force)1712 int ext4_update_overhead(struct super_block *sb, bool force) 1713 { 1714 struct ext4_sb_info *sbi = EXT4_SB(sb); 1715 1716 if (sb_rdonly(sb)) 1717 return 0; 1718 if (!force && 1719 (sbi->s_overhead == 0 || 1720 sbi->s_overhead == le32_to_cpu(sbi->s_es->s_overhead_clusters))) 1721 return 0; 1722 return ext4_update_superblocks_fn(sb, set_overhead, &sbi->s_overhead); 1723 } 1724