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 <linux/quotaops.h> 18 #include <asm/uaccess.h> 19 #include "ext4_jbd2.h" 20 #include "ext4.h" 21 22 #define MAX_32_NUM ((((unsigned long long) 1) << 32) - 1) 23 24 /** 25 * Swap memory between @a and @b for @len bytes. 26 * 27 * @a: pointer to first memory area 28 * @b: pointer to second memory area 29 * @len: number of bytes to swap 30 * 31 */ 32 static void memswap(void *a, void *b, size_t len) 33 { 34 unsigned char *ap, *bp; 35 36 ap = (unsigned char *)a; 37 bp = (unsigned char *)b; 38 while (len-- > 0) { 39 swap(*ap, *bp); 40 ap++; 41 bp++; 42 } 43 } 44 45 /** 46 * Swap i_data and associated attributes between @inode1 and @inode2. 47 * This function is used for the primary swap between inode1 and inode2 48 * and also to revert this primary swap in case of errors. 49 * 50 * Therefore you have to make sure, that calling this method twice 51 * will revert all changes. 52 * 53 * @inode1: pointer to first inode 54 * @inode2: pointer to second inode 55 */ 56 static void swap_inode_data(struct inode *inode1, struct inode *inode2) 57 { 58 loff_t isize; 59 struct ext4_inode_info *ei1; 60 struct ext4_inode_info *ei2; 61 62 ei1 = EXT4_I(inode1); 63 ei2 = EXT4_I(inode2); 64 65 memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags)); 66 memswap(&inode1->i_version, &inode2->i_version, 67 sizeof(inode1->i_version)); 68 memswap(&inode1->i_blocks, &inode2->i_blocks, 69 sizeof(inode1->i_blocks)); 70 memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes)); 71 memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime)); 72 memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime)); 73 74 memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data)); 75 memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags)); 76 memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize)); 77 ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS); 78 ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS); 79 80 isize = i_size_read(inode1); 81 i_size_write(inode1, i_size_read(inode2)); 82 i_size_write(inode2, isize); 83 } 84 85 /** 86 * Swap the information from the given @inode and the inode 87 * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other 88 * important fields of the inodes. 89 * 90 * @sb: the super block of the filesystem 91 * @inode: the inode to swap with EXT4_BOOT_LOADER_INO 92 * 93 */ 94 static long swap_inode_boot_loader(struct super_block *sb, 95 struct inode *inode) 96 { 97 handle_t *handle; 98 int err; 99 struct inode *inode_bl; 100 struct ext4_inode_info *ei_bl; 101 struct ext4_sb_info *sbi = EXT4_SB(sb); 102 103 if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode)) 104 return -EINVAL; 105 106 if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN)) 107 return -EPERM; 108 109 inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO); 110 if (IS_ERR(inode_bl)) 111 return PTR_ERR(inode_bl); 112 ei_bl = EXT4_I(inode_bl); 113 114 filemap_flush(inode->i_mapping); 115 filemap_flush(inode_bl->i_mapping); 116 117 /* Protect orig inodes against a truncate and make sure, 118 * that only 1 swap_inode_boot_loader is running. */ 119 lock_two_nondirectories(inode, inode_bl); 120 121 truncate_inode_pages(&inode->i_data, 0); 122 truncate_inode_pages(&inode_bl->i_data, 0); 123 124 /* Wait for all existing dio workers */ 125 ext4_inode_block_unlocked_dio(inode); 126 ext4_inode_block_unlocked_dio(inode_bl); 127 inode_dio_wait(inode); 128 inode_dio_wait(inode_bl); 129 130 handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2); 131 if (IS_ERR(handle)) { 132 err = -EINVAL; 133 goto journal_err_out; 134 } 135 136 /* Protect extent tree against block allocations via delalloc */ 137 ext4_double_down_write_data_sem(inode, inode_bl); 138 139 if (inode_bl->i_nlink == 0) { 140 /* this inode has never been used as a BOOT_LOADER */ 141 set_nlink(inode_bl, 1); 142 i_uid_write(inode_bl, 0); 143 i_gid_write(inode_bl, 0); 144 inode_bl->i_flags = 0; 145 ei_bl->i_flags = 0; 146 inode_bl->i_version = 1; 147 i_size_write(inode_bl, 0); 148 inode_bl->i_mode = S_IFREG; 149 if (ext4_has_feature_extents(sb)) { 150 ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS); 151 ext4_ext_tree_init(handle, inode_bl); 152 } else 153 memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data)); 154 } 155 156 swap_inode_data(inode, inode_bl); 157 158 inode->i_ctime = inode_bl->i_ctime = ext4_current_time(inode); 159 160 spin_lock(&sbi->s_next_gen_lock); 161 inode->i_generation = sbi->s_next_generation++; 162 inode_bl->i_generation = sbi->s_next_generation++; 163 spin_unlock(&sbi->s_next_gen_lock); 164 165 ext4_discard_preallocations(inode); 166 167 err = ext4_mark_inode_dirty(handle, inode); 168 if (err < 0) { 169 ext4_warning(inode->i_sb, 170 "couldn't mark inode #%lu dirty (err %d)", 171 inode->i_ino, err); 172 /* Revert all changes: */ 173 swap_inode_data(inode, inode_bl); 174 } else { 175 err = ext4_mark_inode_dirty(handle, inode_bl); 176 if (err < 0) { 177 ext4_warning(inode_bl->i_sb, 178 "couldn't mark inode #%lu dirty (err %d)", 179 inode_bl->i_ino, err); 180 /* Revert all changes: */ 181 swap_inode_data(inode, inode_bl); 182 ext4_mark_inode_dirty(handle, inode); 183 } 184 } 185 ext4_journal_stop(handle); 186 ext4_double_up_write_data_sem(inode, inode_bl); 187 188 journal_err_out: 189 ext4_inode_resume_unlocked_dio(inode); 190 ext4_inode_resume_unlocked_dio(inode_bl); 191 unlock_two_nondirectories(inode, inode_bl); 192 iput(inode_bl); 193 return err; 194 } 195 196 static int uuid_is_zero(__u8 u[16]) 197 { 198 int i; 199 200 for (i = 0; i < 16; i++) 201 if (u[i]) 202 return 0; 203 return 1; 204 } 205 206 static int ext4_ioctl_setflags(struct inode *inode, 207 unsigned int flags) 208 { 209 struct ext4_inode_info *ei = EXT4_I(inode); 210 handle_t *handle = NULL; 211 int err = EPERM, migrate = 0; 212 struct ext4_iloc iloc; 213 unsigned int oldflags, mask, i; 214 unsigned int jflag; 215 216 /* Is it quota file? Do not allow user to mess with it */ 217 if (IS_NOQUOTA(inode)) 218 goto flags_out; 219 220 oldflags = ei->i_flags; 221 222 /* The JOURNAL_DATA flag is modifiable only by root */ 223 jflag = flags & EXT4_JOURNAL_DATA_FL; 224 225 /* 226 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 227 * the relevant capability. 228 * 229 * This test looks nicer. Thanks to Pauline Middelink 230 */ 231 if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) { 232 if (!capable(CAP_LINUX_IMMUTABLE)) 233 goto flags_out; 234 } 235 236 /* 237 * The JOURNAL_DATA flag can only be changed by 238 * the relevant capability. 239 */ 240 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) { 241 if (!capable(CAP_SYS_RESOURCE)) 242 goto flags_out; 243 } 244 if ((flags ^ oldflags) & EXT4_EXTENTS_FL) 245 migrate = 1; 246 247 if (flags & EXT4_EOFBLOCKS_FL) { 248 /* we don't support adding EOFBLOCKS flag */ 249 if (!(oldflags & EXT4_EOFBLOCKS_FL)) { 250 err = -EOPNOTSUPP; 251 goto flags_out; 252 } 253 } else if (oldflags & EXT4_EOFBLOCKS_FL) 254 ext4_truncate(inode); 255 256 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 257 if (IS_ERR(handle)) { 258 err = PTR_ERR(handle); 259 goto flags_out; 260 } 261 if (IS_SYNC(inode)) 262 ext4_handle_sync(handle); 263 err = ext4_reserve_inode_write(handle, inode, &iloc); 264 if (err) 265 goto flags_err; 266 267 for (i = 0, mask = 1; i < 32; i++, mask <<= 1) { 268 if (!(mask & EXT4_FL_USER_MODIFIABLE)) 269 continue; 270 if (mask & flags) 271 ext4_set_inode_flag(inode, i); 272 else 273 ext4_clear_inode_flag(inode, i); 274 } 275 276 ext4_set_inode_flags(inode); 277 inode->i_ctime = ext4_current_time(inode); 278 279 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 280 flags_err: 281 ext4_journal_stop(handle); 282 if (err) 283 goto flags_out; 284 285 if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) 286 err = ext4_change_inode_journal_flag(inode, jflag); 287 if (err) 288 goto flags_out; 289 if (migrate) { 290 if (flags & EXT4_EXTENTS_FL) 291 err = ext4_ext_migrate(inode); 292 else 293 err = ext4_ind_migrate(inode); 294 } 295 296 flags_out: 297 return err; 298 } 299 300 #ifdef CONFIG_QUOTA 301 static int ext4_ioctl_setproject(struct file *filp, __u32 projid) 302 { 303 struct inode *inode = file_inode(filp); 304 struct super_block *sb = inode->i_sb; 305 struct ext4_inode_info *ei = EXT4_I(inode); 306 int err, rc; 307 handle_t *handle; 308 kprojid_t kprojid; 309 struct ext4_iloc iloc; 310 struct ext4_inode *raw_inode; 311 312 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 313 EXT4_FEATURE_RO_COMPAT_PROJECT)) { 314 if (projid != EXT4_DEF_PROJID) 315 return -EOPNOTSUPP; 316 else 317 return 0; 318 } 319 320 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE) 321 return -EOPNOTSUPP; 322 323 kprojid = make_kprojid(&init_user_ns, (projid_t)projid); 324 325 if (projid_eq(kprojid, EXT4_I(inode)->i_projid)) 326 return 0; 327 328 err = mnt_want_write_file(filp); 329 if (err) 330 return err; 331 332 err = -EPERM; 333 inode_lock(inode); 334 /* Is it quota file? Do not allow user to mess with it */ 335 if (IS_NOQUOTA(inode)) 336 goto out_unlock; 337 338 err = ext4_get_inode_loc(inode, &iloc); 339 if (err) 340 goto out_unlock; 341 342 raw_inode = ext4_raw_inode(&iloc); 343 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 344 err = -EOVERFLOW; 345 brelse(iloc.bh); 346 goto out_unlock; 347 } 348 brelse(iloc.bh); 349 350 dquot_initialize(inode); 351 352 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 353 EXT4_QUOTA_INIT_BLOCKS(sb) + 354 EXT4_QUOTA_DEL_BLOCKS(sb) + 3); 355 if (IS_ERR(handle)) { 356 err = PTR_ERR(handle); 357 goto out_unlock; 358 } 359 360 err = ext4_reserve_inode_write(handle, inode, &iloc); 361 if (err) 362 goto out_stop; 363 364 if (sb_has_quota_limits_enabled(sb, PRJQUOTA)) { 365 struct dquot *transfer_to[MAXQUOTAS] = { }; 366 367 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid)); 368 if (transfer_to[PRJQUOTA]) { 369 err = __dquot_transfer(inode, transfer_to); 370 dqput(transfer_to[PRJQUOTA]); 371 if (err) 372 goto out_dirty; 373 } 374 } 375 EXT4_I(inode)->i_projid = kprojid; 376 inode->i_ctime = ext4_current_time(inode); 377 out_dirty: 378 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 379 if (!err) 380 err = rc; 381 out_stop: 382 ext4_journal_stop(handle); 383 out_unlock: 384 inode_unlock(inode); 385 mnt_drop_write_file(filp); 386 return err; 387 } 388 #else 389 static int ext4_ioctl_setproject(struct file *filp, __u32 projid) 390 { 391 if (projid != EXT4_DEF_PROJID) 392 return -EOPNOTSUPP; 393 return 0; 394 } 395 #endif 396 397 /* Transfer internal flags to xflags */ 398 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags) 399 { 400 __u32 xflags = 0; 401 402 if (iflags & EXT4_SYNC_FL) 403 xflags |= FS_XFLAG_SYNC; 404 if (iflags & EXT4_IMMUTABLE_FL) 405 xflags |= FS_XFLAG_IMMUTABLE; 406 if (iflags & EXT4_APPEND_FL) 407 xflags |= FS_XFLAG_APPEND; 408 if (iflags & EXT4_NODUMP_FL) 409 xflags |= FS_XFLAG_NODUMP; 410 if (iflags & EXT4_NOATIME_FL) 411 xflags |= FS_XFLAG_NOATIME; 412 if (iflags & EXT4_PROJINHERIT_FL) 413 xflags |= FS_XFLAG_PROJINHERIT; 414 return xflags; 415 } 416 417 /* Transfer xflags flags to internal */ 418 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags) 419 { 420 unsigned long iflags = 0; 421 422 if (xflags & FS_XFLAG_SYNC) 423 iflags |= EXT4_SYNC_FL; 424 if (xflags & FS_XFLAG_IMMUTABLE) 425 iflags |= EXT4_IMMUTABLE_FL; 426 if (xflags & FS_XFLAG_APPEND) 427 iflags |= EXT4_APPEND_FL; 428 if (xflags & FS_XFLAG_NODUMP) 429 iflags |= EXT4_NODUMP_FL; 430 if (xflags & FS_XFLAG_NOATIME) 431 iflags |= EXT4_NOATIME_FL; 432 if (xflags & FS_XFLAG_PROJINHERIT) 433 iflags |= EXT4_PROJINHERIT_FL; 434 435 return iflags; 436 } 437 438 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 439 { 440 struct inode *inode = file_inode(filp); 441 struct super_block *sb = inode->i_sb; 442 struct ext4_inode_info *ei = EXT4_I(inode); 443 unsigned int flags; 444 445 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 446 447 switch (cmd) { 448 case EXT4_IOC_GETFLAGS: 449 ext4_get_inode_flags(ei); 450 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 451 return put_user(flags, (int __user *) arg); 452 case EXT4_IOC_SETFLAGS: { 453 int err; 454 455 if (!inode_owner_or_capable(inode)) 456 return -EACCES; 457 458 if (get_user(flags, (int __user *) arg)) 459 return -EFAULT; 460 461 err = mnt_want_write_file(filp); 462 if (err) 463 return err; 464 465 flags = ext4_mask_flags(inode->i_mode, flags); 466 467 inode_lock(inode); 468 err = ext4_ioctl_setflags(inode, flags); 469 inode_unlock(inode); 470 mnt_drop_write_file(filp); 471 return err; 472 } 473 case EXT4_IOC_GETVERSION: 474 case EXT4_IOC_GETVERSION_OLD: 475 return put_user(inode->i_generation, (int __user *) arg); 476 case EXT4_IOC_SETVERSION: 477 case EXT4_IOC_SETVERSION_OLD: { 478 handle_t *handle; 479 struct ext4_iloc iloc; 480 __u32 generation; 481 int err; 482 483 if (!inode_owner_or_capable(inode)) 484 return -EPERM; 485 486 if (ext4_has_metadata_csum(inode->i_sb)) { 487 ext4_warning(sb, "Setting inode version is not " 488 "supported with metadata_csum enabled."); 489 return -ENOTTY; 490 } 491 492 err = mnt_want_write_file(filp); 493 if (err) 494 return err; 495 if (get_user(generation, (int __user *) arg)) { 496 err = -EFAULT; 497 goto setversion_out; 498 } 499 500 inode_lock(inode); 501 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 502 if (IS_ERR(handle)) { 503 err = PTR_ERR(handle); 504 goto unlock_out; 505 } 506 err = ext4_reserve_inode_write(handle, inode, &iloc); 507 if (err == 0) { 508 inode->i_ctime = ext4_current_time(inode); 509 inode->i_generation = generation; 510 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 511 } 512 ext4_journal_stop(handle); 513 514 unlock_out: 515 inode_unlock(inode); 516 setversion_out: 517 mnt_drop_write_file(filp); 518 return err; 519 } 520 case EXT4_IOC_GROUP_EXTEND: { 521 ext4_fsblk_t n_blocks_count; 522 int err, err2=0; 523 524 err = ext4_resize_begin(sb); 525 if (err) 526 return err; 527 528 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 529 err = -EFAULT; 530 goto group_extend_out; 531 } 532 533 if (ext4_has_feature_bigalloc(sb)) { 534 ext4_msg(sb, KERN_ERR, 535 "Online resizing not supported with bigalloc"); 536 err = -EOPNOTSUPP; 537 goto group_extend_out; 538 } 539 540 err = mnt_want_write_file(filp); 541 if (err) 542 goto group_extend_out; 543 544 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 545 if (EXT4_SB(sb)->s_journal) { 546 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 547 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 548 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 549 } 550 if (err == 0) 551 err = err2; 552 mnt_drop_write_file(filp); 553 group_extend_out: 554 ext4_resize_end(sb); 555 return err; 556 } 557 558 case EXT4_IOC_MOVE_EXT: { 559 struct move_extent me; 560 struct fd donor; 561 int err; 562 563 if (!(filp->f_mode & FMODE_READ) || 564 !(filp->f_mode & FMODE_WRITE)) 565 return -EBADF; 566 567 if (copy_from_user(&me, 568 (struct move_extent __user *)arg, sizeof(me))) 569 return -EFAULT; 570 me.moved_len = 0; 571 572 donor = fdget(me.donor_fd); 573 if (!donor.file) 574 return -EBADF; 575 576 if (!(donor.file->f_mode & FMODE_WRITE)) { 577 err = -EBADF; 578 goto mext_out; 579 } 580 581 if (ext4_has_feature_bigalloc(sb)) { 582 ext4_msg(sb, KERN_ERR, 583 "Online defrag not supported with bigalloc"); 584 err = -EOPNOTSUPP; 585 goto mext_out; 586 } 587 588 err = mnt_want_write_file(filp); 589 if (err) 590 goto mext_out; 591 592 err = ext4_move_extents(filp, donor.file, me.orig_start, 593 me.donor_start, me.len, &me.moved_len); 594 mnt_drop_write_file(filp); 595 596 if (copy_to_user((struct move_extent __user *)arg, 597 &me, sizeof(me))) 598 err = -EFAULT; 599 mext_out: 600 fdput(donor); 601 return err; 602 } 603 604 case EXT4_IOC_GROUP_ADD: { 605 struct ext4_new_group_data input; 606 int err, err2=0; 607 608 err = ext4_resize_begin(sb); 609 if (err) 610 return err; 611 612 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 613 sizeof(input))) { 614 err = -EFAULT; 615 goto group_add_out; 616 } 617 618 if (ext4_has_feature_bigalloc(sb)) { 619 ext4_msg(sb, KERN_ERR, 620 "Online resizing not supported with bigalloc"); 621 err = -EOPNOTSUPP; 622 goto group_add_out; 623 } 624 625 err = mnt_want_write_file(filp); 626 if (err) 627 goto group_add_out; 628 629 err = ext4_group_add(sb, &input); 630 if (EXT4_SB(sb)->s_journal) { 631 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 632 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 633 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 634 } 635 if (err == 0) 636 err = err2; 637 mnt_drop_write_file(filp); 638 if (!err && ext4_has_group_desc_csum(sb) && 639 test_opt(sb, INIT_INODE_TABLE)) 640 err = ext4_register_li_request(sb, input.group); 641 group_add_out: 642 ext4_resize_end(sb); 643 return err; 644 } 645 646 case EXT4_IOC_MIGRATE: 647 { 648 int err; 649 if (!inode_owner_or_capable(inode)) 650 return -EACCES; 651 652 err = mnt_want_write_file(filp); 653 if (err) 654 return err; 655 /* 656 * inode_mutex prevent write and truncate on the file. 657 * Read still goes through. We take i_data_sem in 658 * ext4_ext_swap_inode_data before we switch the 659 * inode format to prevent read. 660 */ 661 inode_lock((inode)); 662 err = ext4_ext_migrate(inode); 663 inode_unlock((inode)); 664 mnt_drop_write_file(filp); 665 return err; 666 } 667 668 case EXT4_IOC_ALLOC_DA_BLKS: 669 { 670 int err; 671 if (!inode_owner_or_capable(inode)) 672 return -EACCES; 673 674 err = mnt_want_write_file(filp); 675 if (err) 676 return err; 677 err = ext4_alloc_da_blocks(inode); 678 mnt_drop_write_file(filp); 679 return err; 680 } 681 682 case EXT4_IOC_SWAP_BOOT: 683 { 684 int err; 685 if (!(filp->f_mode & FMODE_WRITE)) 686 return -EBADF; 687 err = mnt_want_write_file(filp); 688 if (err) 689 return err; 690 err = swap_inode_boot_loader(sb, inode); 691 mnt_drop_write_file(filp); 692 return err; 693 } 694 695 case EXT4_IOC_RESIZE_FS: { 696 ext4_fsblk_t n_blocks_count; 697 int err = 0, err2 = 0; 698 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 699 700 if (ext4_has_feature_bigalloc(sb)) { 701 ext4_msg(sb, KERN_ERR, 702 "Online resizing not (yet) supported with bigalloc"); 703 return -EOPNOTSUPP; 704 } 705 706 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 707 sizeof(__u64))) { 708 return -EFAULT; 709 } 710 711 err = ext4_resize_begin(sb); 712 if (err) 713 return err; 714 715 err = mnt_want_write_file(filp); 716 if (err) 717 goto resizefs_out; 718 719 err = ext4_resize_fs(sb, n_blocks_count); 720 if (EXT4_SB(sb)->s_journal) { 721 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 722 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 723 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 724 } 725 if (err == 0) 726 err = err2; 727 mnt_drop_write_file(filp); 728 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) && 729 ext4_has_group_desc_csum(sb) && 730 test_opt(sb, INIT_INODE_TABLE)) 731 err = ext4_register_li_request(sb, o_group); 732 733 resizefs_out: 734 ext4_resize_end(sb); 735 return err; 736 } 737 738 case FITRIM: 739 { 740 struct request_queue *q = bdev_get_queue(sb->s_bdev); 741 struct fstrim_range range; 742 int ret = 0; 743 744 if (!capable(CAP_SYS_ADMIN)) 745 return -EPERM; 746 747 if (!blk_queue_discard(q)) 748 return -EOPNOTSUPP; 749 750 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 751 sizeof(range))) 752 return -EFAULT; 753 754 range.minlen = max((unsigned int)range.minlen, 755 q->limits.discard_granularity); 756 ret = ext4_trim_fs(sb, &range); 757 if (ret < 0) 758 return ret; 759 760 if (copy_to_user((struct fstrim_range __user *)arg, &range, 761 sizeof(range))) 762 return -EFAULT; 763 764 return 0; 765 } 766 case EXT4_IOC_PRECACHE_EXTENTS: 767 return ext4_ext_precache(inode); 768 case EXT4_IOC_SET_ENCRYPTION_POLICY: { 769 #ifdef CONFIG_EXT4_FS_ENCRYPTION 770 struct ext4_encryption_policy policy; 771 int err = 0; 772 773 if (copy_from_user(&policy, 774 (struct ext4_encryption_policy __user *)arg, 775 sizeof(policy))) { 776 err = -EFAULT; 777 goto encryption_policy_out; 778 } 779 780 err = ext4_process_policy(&policy, inode); 781 encryption_policy_out: 782 return err; 783 #else 784 return -EOPNOTSUPP; 785 #endif 786 } 787 case EXT4_IOC_GET_ENCRYPTION_PWSALT: { 788 int err, err2; 789 struct ext4_sb_info *sbi = EXT4_SB(sb); 790 handle_t *handle; 791 792 if (!ext4_sb_has_crypto(sb)) 793 return -EOPNOTSUPP; 794 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) { 795 err = mnt_want_write_file(filp); 796 if (err) 797 return err; 798 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); 799 if (IS_ERR(handle)) { 800 err = PTR_ERR(handle); 801 goto pwsalt_err_exit; 802 } 803 err = ext4_journal_get_write_access(handle, sbi->s_sbh); 804 if (err) 805 goto pwsalt_err_journal; 806 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt); 807 err = ext4_handle_dirty_metadata(handle, NULL, 808 sbi->s_sbh); 809 pwsalt_err_journal: 810 err2 = ext4_journal_stop(handle); 811 if (err2 && !err) 812 err = err2; 813 pwsalt_err_exit: 814 mnt_drop_write_file(filp); 815 if (err) 816 return err; 817 } 818 if (copy_to_user((void __user *) arg, 819 sbi->s_es->s_encrypt_pw_salt, 16)) 820 return -EFAULT; 821 return 0; 822 } 823 case EXT4_IOC_GET_ENCRYPTION_POLICY: { 824 #ifdef CONFIG_EXT4_FS_ENCRYPTION 825 struct ext4_encryption_policy policy; 826 int err = 0; 827 828 if (!ext4_encrypted_inode(inode)) 829 return -ENOENT; 830 err = ext4_get_policy(inode, &policy); 831 if (err) 832 return err; 833 if (copy_to_user((void __user *)arg, &policy, sizeof(policy))) 834 return -EFAULT; 835 return 0; 836 #else 837 return -EOPNOTSUPP; 838 #endif 839 } 840 case EXT4_IOC_FSGETXATTR: 841 { 842 struct fsxattr fa; 843 844 memset(&fa, 0, sizeof(struct fsxattr)); 845 ext4_get_inode_flags(ei); 846 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE); 847 848 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 849 EXT4_FEATURE_RO_COMPAT_PROJECT)) { 850 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns, 851 EXT4_I(inode)->i_projid); 852 } 853 854 if (copy_to_user((struct fsxattr __user *)arg, 855 &fa, sizeof(fa))) 856 return -EFAULT; 857 return 0; 858 } 859 case EXT4_IOC_FSSETXATTR: 860 { 861 struct fsxattr fa; 862 int err; 863 864 if (copy_from_user(&fa, (struct fsxattr __user *)arg, 865 sizeof(fa))) 866 return -EFAULT; 867 868 /* Make sure caller has proper permission */ 869 if (!inode_owner_or_capable(inode)) 870 return -EACCES; 871 872 err = mnt_want_write_file(filp); 873 if (err) 874 return err; 875 876 flags = ext4_xflags_to_iflags(fa.fsx_xflags); 877 flags = ext4_mask_flags(inode->i_mode, flags); 878 879 inode_lock(inode); 880 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) | 881 (flags & EXT4_FL_XFLAG_VISIBLE); 882 err = ext4_ioctl_setflags(inode, flags); 883 inode_unlock(inode); 884 mnt_drop_write_file(filp); 885 if (err) 886 return err; 887 888 err = ext4_ioctl_setproject(filp, fa.fsx_projid); 889 if (err) 890 return err; 891 892 return 0; 893 } 894 default: 895 return -ENOTTY; 896 } 897 } 898 899 #ifdef CONFIG_COMPAT 900 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 901 { 902 /* These are just misnamed, they actually get/put from/to user an int */ 903 switch (cmd) { 904 case EXT4_IOC32_GETFLAGS: 905 cmd = EXT4_IOC_GETFLAGS; 906 break; 907 case EXT4_IOC32_SETFLAGS: 908 cmd = EXT4_IOC_SETFLAGS; 909 break; 910 case EXT4_IOC32_GETVERSION: 911 cmd = EXT4_IOC_GETVERSION; 912 break; 913 case EXT4_IOC32_SETVERSION: 914 cmd = EXT4_IOC_SETVERSION; 915 break; 916 case EXT4_IOC32_GROUP_EXTEND: 917 cmd = EXT4_IOC_GROUP_EXTEND; 918 break; 919 case EXT4_IOC32_GETVERSION_OLD: 920 cmd = EXT4_IOC_GETVERSION_OLD; 921 break; 922 case EXT4_IOC32_SETVERSION_OLD: 923 cmd = EXT4_IOC_SETVERSION_OLD; 924 break; 925 case EXT4_IOC32_GETRSVSZ: 926 cmd = EXT4_IOC_GETRSVSZ; 927 break; 928 case EXT4_IOC32_SETRSVSZ: 929 cmd = EXT4_IOC_SETRSVSZ; 930 break; 931 case EXT4_IOC32_GROUP_ADD: { 932 struct compat_ext4_new_group_input __user *uinput; 933 struct ext4_new_group_input input; 934 mm_segment_t old_fs; 935 int err; 936 937 uinput = compat_ptr(arg); 938 err = get_user(input.group, &uinput->group); 939 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 940 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 941 err |= get_user(input.inode_table, &uinput->inode_table); 942 err |= get_user(input.blocks_count, &uinput->blocks_count); 943 err |= get_user(input.reserved_blocks, 944 &uinput->reserved_blocks); 945 if (err) 946 return -EFAULT; 947 old_fs = get_fs(); 948 set_fs(KERNEL_DS); 949 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 950 (unsigned long) &input); 951 set_fs(old_fs); 952 return err; 953 } 954 case EXT4_IOC_MOVE_EXT: 955 case EXT4_IOC_RESIZE_FS: 956 case EXT4_IOC_PRECACHE_EXTENTS: 957 case EXT4_IOC_SET_ENCRYPTION_POLICY: 958 case EXT4_IOC_GET_ENCRYPTION_PWSALT: 959 case EXT4_IOC_GET_ENCRYPTION_POLICY: 960 break; 961 default: 962 return -ENOIOCTLCMD; 963 } 964 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 965 } 966 #endif 967