1/* 2 * linux/fs/ext4/ioctl.c 3 * 4 * Copyright (C) 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 */ 9 10#include <linux/fs.h> 11#include <linux/capability.h> 12#include <linux/time.h> 13#include <linux/compat.h> 14#include <linux/mount.h> 15#include <linux/file.h> 16#include <linux/random.h> 17#include <asm/uaccess.h> 18#include "ext4_jbd2.h" 19#include "ext4.h" 20 21#define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1) 22 23/** 24 * Swap memory between @a and @b for @len bytes. 25 * 26 * @a: pointer to first memory area 27 * @b: pointer to second memory area 28 * @len: number of bytes to swap 29 * 30 */ 31static void memswap(void *a, void *b, size_t len) 32{ 33 unsigned char *ap, *bp; 34 unsigned char tmp; 35 36 ap = (unsigned char *)a; 37 bp = (unsigned char *)b; 38 while (len-- > 0) { 39 tmp = *ap; 40 *ap = *bp; 41 *bp = tmp; 42 ap++; 43 bp++; 44 } 45} 46 47/** 48 * Swap i_data and associated attributes between @inode1 and @inode2. 49 * This function is used for the primary swap between inode1 and inode2 50 * and also to revert this primary swap in case of errors. 51 * 52 * Therefore you have to make sure, that calling this method twice 53 * will revert all changes. 54 * 55 * @inode1: pointer to first inode 56 * @inode2: pointer to second inode 57 */ 58static void swap_inode_data(struct inode *inode1, struct inode *inode2) 59{ 60 loff_t isize; 61 struct ext4_inode_info *ei1; 62 struct ext4_inode_info *ei2; 63 64 ei1 = EXT4_I(inode1); 65 ei2 = EXT4_I(inode2); 66 67 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags)); 68 memswap(&inode1->i_version, &inode2->i_version, 69 sizeof(inode1->i_version)); 70 memswap(&inode1->i_blocks, &inode2->i_blocks, 71 sizeof(inode1->i_blocks)); 72 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes)); 73 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime)); 74 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime)); 75 76 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data)); 77 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags)); 78 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize)); 79 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); 80 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); 81 82 isize = i_size_read(inode1); 83 i_size_write(inode1, i_size_read(inode2)); 84 i_size_write(inode2, isize); 85} 86 87/** 88 * Swap the information from the given @inode and the inode 89 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other 90 * important fields of the inodes. 91 * 92 * @sb: the super block of the filesystem 93 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO 94 * 95 */ 96static long swap_inode_boot_loader(struct super_block *sb, 97 struct inode *inode) 98{ 99 handle_t *handle; 100 int err; 101 struct inode *inode_bl; 102 struct ext4_inode_info *ei_bl; 103 struct ext4_sb_info *sbi = EXT4_SB(sb); 104 105 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) 106 return -EINVAL; 107 108 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) 109 return -EPERM; 110 111 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO); 112 if (IS_ERR(inode_bl)) 113 return PTR_ERR(inode_bl); 114 ei_bl = EXT4_I(inode_bl); 115 116 filemap_flush(inode->i_mapping); 117 filemap_flush(inode_bl->i_mapping); 118 119 /* Protect orig inodes against a truncate and make sure, 120 * that only 1 swap_inode_boot_loader is running. */ 121 lock_two_nondirectories(inode, inode_bl); 122 123 truncate_inode_pages(&inode->i_data, 0); 124 truncate_inode_pages(&inode_bl->i_data, 0); 125 126 /* Wait for all existing dio workers */ 127 ext4_inode_block_unlocked_dio(inode); 128 ext4_inode_block_unlocked_dio(inode_bl); 129 inode_dio_wait(inode); 130 inode_dio_wait(inode_bl); 131 132 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2); 133 if (IS_ERR(handle)) { 134 err = -EINVAL; 135 goto journal_err_out; 136 } 137 138 /* Protect extent tree against block allocations via delalloc */ 139 ext4_double_down_write_data_sem(inode, inode_bl); 140 141 if (inode_bl->i_nlink == 0) { 142 /* this inode has never been used as a BOOT_LOADER */ 143 set_nlink(inode_bl, 1); 144 i_uid_write(inode_bl, 0); 145 i_gid_write(inode_bl, 0); 146 inode_bl->i_flags = 0; 147 ei_bl->i_flags = 0; 148 inode_bl->i_version = 1; 149 i_size_write(inode_bl, 0); 150 inode_bl->i_mode = S_IFREG; 151 if (EXT4_HAS_INCOMPAT_FEATURE(sb, 152 EXT4_FEATURE_INCOMPAT_EXTENTS)) { 153 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS); 154 ext4_ext_tree_init(handle, inode_bl); 155 } else 156 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); 157 } 158 159 swap_inode_data(inode, inode_bl); 160 161 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode); 162 163 spin_lock(&sbi->s_next_gen_lock); 164 inode->i_generation = sbi->s_next_generation++; 165 inode_bl->i_generation = sbi->s_next_generation++; 166 spin_unlock(&sbi->s_next_gen_lock); 167 168 ext4_discard_preallocations(inode); 169 170 err = ext4_mark_inode_dirty(handle, inode); 171 if (err < 0) { 172 ext4_warning(inode->i_sb, 173 "couldn't mark inode #%lu dirty (err %d)", 174 inode->i_ino, err); 175 /* Revert all changes: */ 176 swap_inode_data(inode, inode_bl); 177 } else { 178 err = ext4_mark_inode_dirty(handle, inode_bl); 179 if (err < 0) { 180 ext4_warning(inode_bl->i_sb, 181 "couldn't mark inode #%lu dirty (err %d)", 182 inode_bl->i_ino, err); 183 /* Revert all changes: */ 184 swap_inode_data(inode, inode_bl); 185 ext4_mark_inode_dirty(handle, inode); 186 } 187 } 188 ext4_journal_stop(handle); 189 ext4_double_up_write_data_sem(inode, inode_bl); 190 191journal_err_out: 192 ext4_inode_resume_unlocked_dio(inode); 193 ext4_inode_resume_unlocked_dio(inode_bl); 194 unlock_two_nondirectories(inode, inode_bl); 195 iput(inode_bl); 196 return err; 197} 198 199static int uuid_is_zero(__u8 u[16]) 200{ 201 int i; 202 203 for (i = 0; i < 16; i++) 204 if (u[i]) 205 return 0; 206 return 1; 207} 208 209long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 210{ 211 struct inode *inode = file_inode(filp); 212 struct super_block *sb = inode->i_sb; 213 struct ext4_inode_info *ei = EXT4_I(inode); 214 unsigned int flags; 215 216 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 217 218 switch (cmd) { 219 case EXT4_IOC_GETFLAGS: 220 ext4_get_inode_flags(ei); 221 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 222 return put_user(flags, (int __user *) arg); 223 case EXT4_IOC_SETFLAGS: { 224 handle_t *handle = NULL; 225 int err, migrate = 0; 226 struct ext4_iloc iloc; 227 unsigned int oldflags, mask, i; 228 unsigned int jflag; 229 230 if (!inode_owner_or_capable(inode)) 231 return -EACCES; 232 233 if (get_user(flags, (int __user *) arg)) 234 return -EFAULT; 235 236 err = mnt_want_write_file(filp); 237 if (err) 238 return err; 239 240 flags = ext4_mask_flags(inode->i_mode, flags); 241 242 err = -EPERM; 243 mutex_lock(&inode->i_mutex); 244 /* Is it quota file? Do not allow user to mess with it */ 245 if (IS_NOQUOTA(inode)) 246 goto flags_out; 247 248 oldflags = ei->i_flags; 249 250 /* The JOURNAL_DATA flag is modifiable only by root */ 251 jflag = flags & EXT4_JOURNAL_DATA_FL; 252 253 /* 254 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 255 * the relevant capability. 256 * 257 * This test looks nicer. Thanks to Pauline Middelink 258 */ 259 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { 260 if (!capable(CAP_LINUX_IMMUTABLE)) 261 goto flags_out; 262 } 263 264 /* 265 * The JOURNAL_DATA flag can only be changed by 266 * the relevant capability. 267 */ 268 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 269 if (!capable(CAP_SYS_RESOURCE)) 270 goto flags_out; 271 } 272 if ((flags ^ oldflags) & EXT4_EXTENTS_FL) 273 migrate = 1; 274 275 if (flags & EXT4_EOFBLOCKS_FL) { 276 /* we don't support adding EOFBLOCKS flag */ 277 if (!(oldflags & EXT4_EOFBLOCKS_FL)) { 278 err = -EOPNOTSUPP; 279 goto flags_out; 280 } 281 } else if (oldflags & EXT4_EOFBLOCKS_FL) 282 ext4_truncate(inode); 283 284 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 285 if (IS_ERR(handle)) { 286 err = PTR_ERR(handle); 287 goto flags_out; 288 } 289 if (IS_SYNC(inode)) 290 ext4_handle_sync(handle); 291 err = ext4_reserve_inode_write(handle, inode, &iloc); 292 if (err) 293 goto flags_err; 294 295 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 296 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 297 continue; 298 if (mask & flags) 299 ext4_set_inode_flag(inode, i); 300 else 301 ext4_clear_inode_flag(inode, i); 302 } 303 304 ext4_set_inode_flags(inode); 305 inode->i_ctime = ext4_current_time(inode); 306 307 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 308flags_err: 309 ext4_journal_stop(handle); 310 if (err) 311 goto flags_out; 312 313 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) 314 err = ext4_change_inode_journal_flag(inode, jflag); 315 if (err) 316 goto flags_out; 317 if (migrate) { 318 if (flags & EXT4_EXTENTS_FL) 319 err = ext4_ext_migrate(inode); 320 else 321 err = ext4_ind_migrate(inode); 322 } 323 324flags_out: 325 mutex_unlock(&inode->i_mutex); 326 mnt_drop_write_file(filp); 327 return err; 328 } 329 case EXT4_IOC_GETVERSION: 330 case EXT4_IOC_GETVERSION_OLD: 331 return put_user(inode->i_generation, (int __user *) arg); 332 case EXT4_IOC_SETVERSION: 333 case EXT4_IOC_SETVERSION_OLD: { 334 handle_t *handle; 335 struct ext4_iloc iloc; 336 __u32 generation; 337 int err; 338 339 if (!inode_owner_or_capable(inode)) 340 return -EPERM; 341 342 if (ext4_has_metadata_csum(inode->i_sb)) { 343 ext4_warning(sb, "Setting inode version is not " 344 "supported with metadata_csum enabled."); 345 return -ENOTTY; 346 } 347 348 err = mnt_want_write_file(filp); 349 if (err) 350 return err; 351 if (get_user(generation, (int __user *) arg)) { 352 err = -EFAULT; 353 goto setversion_out; 354 } 355 356 mutex_lock(&inode->i_mutex); 357 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 358 if (IS_ERR(handle)) { 359 err = PTR_ERR(handle); 360 goto unlock_out; 361 } 362 err = ext4_reserve_inode_write(handle, inode, &iloc); 363 if (err == 0) { 364 inode->i_ctime = ext4_current_time(inode); 365 inode->i_generation = generation; 366 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 367 } 368 ext4_journal_stop(handle); 369 370unlock_out: 371 mutex_unlock(&inode->i_mutex); 372setversion_out: 373 mnt_drop_write_file(filp); 374 return err; 375 } 376 case EXT4_IOC_GROUP_EXTEND: { 377 ext4_fsblk_t n_blocks_count; 378 int err, err2=0; 379 380 err = ext4_resize_begin(sb); 381 if (err) 382 return err; 383 384 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 385 err = -EFAULT; 386 goto group_extend_out; 387 } 388 389 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 390 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 391 ext4_msg(sb, KERN_ERR, 392 "Online resizing not supported with bigalloc"); 393 err = -EOPNOTSUPP; 394 goto group_extend_out; 395 } 396 397 err = mnt_want_write_file(filp); 398 if (err) 399 goto group_extend_out; 400 401 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 402 if (EXT4_SB(sb)->s_journal) { 403 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 404 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 405 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 406 } 407 if (err == 0) 408 err = err2; 409 mnt_drop_write_file(filp); 410group_extend_out: 411 ext4_resize_end(sb); 412 return err; 413 } 414 415 case EXT4_IOC_MOVE_EXT: { 416 struct move_extent me; 417 struct fd donor; 418 int err; 419 420 if (!(filp->f_mode & FMODE_READ) || 421 !(filp->f_mode & FMODE_WRITE)) 422 return -EBADF; 423 424 if (copy_from_user(&me, 425 (struct move_extent __user *)arg, sizeof(me))) 426 return -EFAULT; 427 me.moved_len = 0; 428 429 donor = fdget(me.donor_fd); 430 if (!donor.file) 431 return -EBADF; 432 433 if (!(donor.file->f_mode & FMODE_WRITE)) { 434 err = -EBADF; 435 goto mext_out; 436 } 437 438 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 439 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 440 ext4_msg(sb, KERN_ERR, 441 "Online defrag not supported with bigalloc"); 442 err = -EOPNOTSUPP; 443 goto mext_out; 444 } 445 446 err = mnt_want_write_file(filp); 447 if (err) 448 goto mext_out; 449 450 err = ext4_move_extents(filp, donor.file, me.orig_start, 451 me.donor_start, me.len, &me.moved_len); 452 mnt_drop_write_file(filp); 453 454 if (copy_to_user((struct move_extent __user *)arg, 455 &me, sizeof(me))) 456 err = -EFAULT; 457mext_out: 458 fdput(donor); 459 return err; 460 } 461 462 case EXT4_IOC_GROUP_ADD: { 463 struct ext4_new_group_data input; 464 int err, err2=0; 465 466 err = ext4_resize_begin(sb); 467 if (err) 468 return err; 469 470 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 471 sizeof(input))) { 472 err = -EFAULT; 473 goto group_add_out; 474 } 475 476 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 477 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 478 ext4_msg(sb, KERN_ERR, 479 "Online resizing not supported with bigalloc"); 480 err = -EOPNOTSUPP; 481 goto group_add_out; 482 } 483 484 err = mnt_want_write_file(filp); 485 if (err) 486 goto group_add_out; 487 488 err = ext4_group_add(sb, &input); 489 if (EXT4_SB(sb)->s_journal) { 490 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 491 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 492 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 493 } 494 if (err == 0) 495 err = err2; 496 mnt_drop_write_file(filp); 497 if (!err && ext4_has_group_desc_csum(sb) && 498 test_opt(sb, INIT_INODE_TABLE)) 499 err = ext4_register_li_request(sb, input.group); 500group_add_out: 501 ext4_resize_end(sb); 502 return err; 503 } 504 505 case EXT4_IOC_MIGRATE: 506 { 507 int err; 508 if (!inode_owner_or_capable(inode)) 509 return -EACCES; 510 511 err = mnt_want_write_file(filp); 512 if (err) 513 return err; 514 /* 515 * inode_mutex prevent write and truncate on the file. 516 * Read still goes through. We take i_data_sem in 517 * ext4_ext_swap_inode_data before we switch the 518 * inode format to prevent read. 519 */ 520 mutex_lock(&(inode->i_mutex)); 521 err = ext4_ext_migrate(inode); 522 mutex_unlock(&(inode->i_mutex)); 523 mnt_drop_write_file(filp); 524 return err; 525 } 526 527 case EXT4_IOC_ALLOC_DA_BLKS: 528 { 529 int err; 530 if (!inode_owner_or_capable(inode)) 531 return -EACCES; 532 533 err = mnt_want_write_file(filp); 534 if (err) 535 return err; 536 err = ext4_alloc_da_blocks(inode); 537 mnt_drop_write_file(filp); 538 return err; 539 } 540 541 case EXT4_IOC_SWAP_BOOT: 542 { 543 int err; 544 if (!(filp->f_mode & FMODE_WRITE)) 545 return -EBADF; 546 err = mnt_want_write_file(filp); 547 if (err) 548 return err; 549 err = swap_inode_boot_loader(sb, inode); 550 mnt_drop_write_file(filp); 551 return err; 552 } 553 554 case EXT4_IOC_RESIZE_FS: { 555 ext4_fsblk_t n_blocks_count; 556 int err = 0, err2 = 0; 557 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 558 559 if (EXT4_HAS_RO_COMPAT_FEATURE(sb, 560 EXT4_FEATURE_RO_COMPAT_BIGALLOC)) { 561 ext4_msg(sb, KERN_ERR, 562 "Online resizing not (yet) supported with bigalloc"); 563 return -EOPNOTSUPP; 564 } 565 566 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 567 sizeof(__u64))) { 568 return -EFAULT; 569 } 570 571 err = ext4_resize_begin(sb); 572 if (err) 573 return err; 574 575 err = mnt_want_write_file(filp); 576 if (err) 577 goto resizefs_out; 578 579 err = ext4_resize_fs(sb, n_blocks_count); 580 if (EXT4_SB(sb)->s_journal) { 581 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 582 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 583 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 584 } 585 if (err == 0) 586 err = err2; 587 mnt_drop_write_file(filp); 588 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) && 589 ext4_has_group_desc_csum(sb) && 590 test_opt(sb, INIT_INODE_TABLE)) 591 err = ext4_register_li_request(sb, o_group); 592 593resizefs_out: 594 ext4_resize_end(sb); 595 return err; 596 } 597 598 case FITRIM: 599 { 600 struct request_queue *q = bdev_get_queue(sb->s_bdev); 601 struct fstrim_range range; 602 int ret = 0; 603 604 if (!capable(CAP_SYS_ADMIN)) 605 return -EPERM; 606 607 if (!blk_queue_discard(q)) 608 return -EOPNOTSUPP; 609 610 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 611 sizeof(range))) 612 return -EFAULT; 613 614 range.minlen = max((unsigned int)range.minlen, 615 q->limits.discard_granularity); 616 ret = ext4_trim_fs(sb, &range); 617 if (ret < 0) 618 return ret; 619 620 if (copy_to_user((struct fstrim_range __user *)arg, &range, 621 sizeof(range))) 622 return -EFAULT; 623 624 return 0; 625 } 626 case EXT4_IOC_PRECACHE_EXTENTS: 627 return ext4_ext_precache(inode); 628 case EXT4_IOC_SET_ENCRYPTION_POLICY: { 629#ifdef CONFIG_EXT4_FS_ENCRYPTION 630 struct ext4_encryption_policy policy; 631 int err = 0; 632 633 if (copy_from_user(&policy, 634 (struct ext4_encryption_policy __user *)arg, 635 sizeof(policy))) { 636 err = -EFAULT; 637 goto encryption_policy_out; 638 } 639 640 err = ext4_process_policy(&policy, inode); 641encryption_policy_out: 642 return err; 643#else 644 return -EOPNOTSUPP; 645#endif 646 } 647 case EXT4_IOC_GET_ENCRYPTION_PWSALT: { 648 int err, err2; 649 struct ext4_sb_info *sbi = EXT4_SB(sb); 650 handle_t *handle; 651 652 if (!ext4_sb_has_crypto(sb)) 653 return -EOPNOTSUPP; 654 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) { 655 err = mnt_want_write_file(filp); 656 if (err) 657 return err; 658 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); 659 if (IS_ERR(handle)) { 660 err = PTR_ERR(handle); 661 goto pwsalt_err_exit; 662 } 663 err = ext4_journal_get_write_access(handle, sbi->s_sbh); 664 if (err) 665 goto pwsalt_err_journal; 666 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt); 667 err = ext4_handle_dirty_metadata(handle, NULL, 668 sbi->s_sbh); 669 pwsalt_err_journal: 670 err2 = ext4_journal_stop(handle); 671 if (err2 && !err) 672 err = err2; 673 pwsalt_err_exit: 674 mnt_drop_write_file(filp); 675 if (err) 676 return err; 677 } 678 if (copy_to_user((void *) arg, sbi->s_es->s_encrypt_pw_salt, 679 16)) 680 return -EFAULT; 681 return 0; 682 } 683 case EXT4_IOC_GET_ENCRYPTION_POLICY: { 684#ifdef CONFIG_EXT4_FS_ENCRYPTION 685 struct ext4_encryption_policy policy; 686 int err = 0; 687 688 if (!ext4_encrypted_inode(inode)) 689 return -ENOENT; 690 err = ext4_get_policy(inode, &policy); 691 if (err) 692 return err; 693 if (copy_to_user((void *)arg, &policy, sizeof(policy))) 694 return -EFAULT; 695 return 0; 696#else 697 return -EOPNOTSUPP; 698#endif 699 } 700 default: 701 return -ENOTTY; 702 } 703} 704 705#ifdef CONFIG_COMPAT 706long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 707{ 708 /* These are just misnamed, they actually get/put from/to user an int */ 709 switch (cmd) { 710 case EXT4_IOC32_GETFLAGS: 711 cmd = EXT4_IOC_GETFLAGS; 712 break; 713 case EXT4_IOC32_SETFLAGS: 714 cmd = EXT4_IOC_SETFLAGS; 715 break; 716 case EXT4_IOC32_GETVERSION: 717 cmd = EXT4_IOC_GETVERSION; 718 break; 719 case EXT4_IOC32_SETVERSION: 720 cmd = EXT4_IOC_SETVERSION; 721 break; 722 case EXT4_IOC32_GROUP_EXTEND: 723 cmd = EXT4_IOC_GROUP_EXTEND; 724 break; 725 case EXT4_IOC32_GETVERSION_OLD: 726 cmd = EXT4_IOC_GETVERSION_OLD; 727 break; 728 case EXT4_IOC32_SETVERSION_OLD: 729 cmd = EXT4_IOC_SETVERSION_OLD; 730 break; 731 case EXT4_IOC32_GETRSVSZ: 732 cmd = EXT4_IOC_GETRSVSZ; 733 break; 734 case EXT4_IOC32_SETRSVSZ: 735 cmd = EXT4_IOC_SETRSVSZ; 736 break; 737 case EXT4_IOC32_GROUP_ADD: { 738 struct compat_ext4_new_group_input __user *uinput; 739 struct ext4_new_group_input input; 740 mm_segment_t old_fs; 741 int err; 742 743 uinput = compat_ptr(arg); 744 err = get_user(input.group, &uinput->group); 745 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 746 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 747 err |= get_user(input.inode_table, &uinput->inode_table); 748 err |= get_user(input.blocks_count, &uinput->blocks_count); 749 err |= get_user(input.reserved_blocks, 750 &uinput->reserved_blocks); 751 if (err) 752 return -EFAULT; 753 old_fs = get_fs(); 754 set_fs(KERNEL_DS); 755 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 756 (unsigned long) &input); 757 set_fs(old_fs); 758 return err; 759 } 760 case EXT4_IOC_MOVE_EXT: 761 case FITRIM: 762 case EXT4_IOC_RESIZE_FS: 763 case EXT4_IOC_PRECACHE_EXTENTS: 764 case EXT4_IOC_SET_ENCRYPTION_POLICY: 765 case EXT4_IOC_GET_ENCRYPTION_PWSALT: 766 case EXT4_IOC_GET_ENCRYPTION_POLICY: 767 break; 768 default: 769 return -ENOIOCTLCMD; 770 } 771 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 772} 773#endif 774