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/quotaops.h> 17 #include <linux/uuid.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 struct dquot *transfer_to[MAXQUOTAS] = { }; 312 313 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, 314 EXT4_FEATURE_RO_COMPAT_PROJECT)) { 315 if (projid != EXT4_DEF_PROJID) 316 return -EOPNOTSUPP; 317 else 318 return 0; 319 } 320 321 if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE) 322 return -EOPNOTSUPP; 323 324 kprojid = make_kprojid(&init_user_ns, (projid_t)projid); 325 326 if (projid_eq(kprojid, EXT4_I(inode)->i_projid)) 327 return 0; 328 329 err = mnt_want_write_file(filp); 330 if (err) 331 return err; 332 333 err = -EPERM; 334 inode_lock(inode); 335 /* Is it quota file? Do not allow user to mess with it */ 336 if (IS_NOQUOTA(inode)) 337 goto out_unlock; 338 339 err = ext4_get_inode_loc(inode, &iloc); 340 if (err) 341 goto out_unlock; 342 343 raw_inode = ext4_raw_inode(&iloc); 344 if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) { 345 err = -EOVERFLOW; 346 brelse(iloc.bh); 347 goto out_unlock; 348 } 349 brelse(iloc.bh); 350 351 dquot_initialize(inode); 352 353 handle = ext4_journal_start(inode, EXT4_HT_QUOTA, 354 EXT4_QUOTA_INIT_BLOCKS(sb) + 355 EXT4_QUOTA_DEL_BLOCKS(sb) + 3); 356 if (IS_ERR(handle)) { 357 err = PTR_ERR(handle); 358 goto out_unlock; 359 } 360 361 err = ext4_reserve_inode_write(handle, inode, &iloc); 362 if (err) 363 goto out_stop; 364 365 transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid)); 366 if (!IS_ERR(transfer_to[PRJQUOTA])) { 367 err = __dquot_transfer(inode, transfer_to); 368 dqput(transfer_to[PRJQUOTA]); 369 if (err) 370 goto out_dirty; 371 } 372 373 EXT4_I(inode)->i_projid = kprojid; 374 inode->i_ctime = ext4_current_time(inode); 375 out_dirty: 376 rc = ext4_mark_iloc_dirty(handle, inode, &iloc); 377 if (!err) 378 err = rc; 379 out_stop: 380 ext4_journal_stop(handle); 381 out_unlock: 382 inode_unlock(inode); 383 mnt_drop_write_file(filp); 384 return err; 385 } 386 #else 387 static int ext4_ioctl_setproject(struct file *filp, __u32 projid) 388 { 389 if (projid != EXT4_DEF_PROJID) 390 return -EOPNOTSUPP; 391 return 0; 392 } 393 #endif 394 395 /* Transfer internal flags to xflags */ 396 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags) 397 { 398 __u32 xflags = 0; 399 400 if (iflags & EXT4_SYNC_FL) 401 xflags |= FS_XFLAG_SYNC; 402 if (iflags & EXT4_IMMUTABLE_FL) 403 xflags |= FS_XFLAG_IMMUTABLE; 404 if (iflags & EXT4_APPEND_FL) 405 xflags |= FS_XFLAG_APPEND; 406 if (iflags & EXT4_NODUMP_FL) 407 xflags |= FS_XFLAG_NODUMP; 408 if (iflags & EXT4_NOATIME_FL) 409 xflags |= FS_XFLAG_NOATIME; 410 if (iflags & EXT4_PROJINHERIT_FL) 411 xflags |= FS_XFLAG_PROJINHERIT; 412 return xflags; 413 } 414 415 /* Transfer xflags flags to internal */ 416 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags) 417 { 418 unsigned long iflags = 0; 419 420 if (xflags & FS_XFLAG_SYNC) 421 iflags |= EXT4_SYNC_FL; 422 if (xflags & FS_XFLAG_IMMUTABLE) 423 iflags |= EXT4_IMMUTABLE_FL; 424 if (xflags & FS_XFLAG_APPEND) 425 iflags |= EXT4_APPEND_FL; 426 if (xflags & FS_XFLAG_NODUMP) 427 iflags |= EXT4_NODUMP_FL; 428 if (xflags & FS_XFLAG_NOATIME) 429 iflags |= EXT4_NOATIME_FL; 430 if (xflags & FS_XFLAG_PROJINHERIT) 431 iflags |= EXT4_PROJINHERIT_FL; 432 433 return iflags; 434 } 435 436 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 437 { 438 struct inode *inode = file_inode(filp); 439 struct super_block *sb = inode->i_sb; 440 struct ext4_inode_info *ei = EXT4_I(inode); 441 unsigned int flags; 442 443 ext4_debug("cmd = %u, arg = %lu\n", cmd, arg); 444 445 switch (cmd) { 446 case EXT4_IOC_GETFLAGS: 447 ext4_get_inode_flags(ei); 448 flags = ei->i_flags & EXT4_FL_USER_VISIBLE; 449 return put_user(flags, (int __user *) arg); 450 case EXT4_IOC_SETFLAGS: { 451 int err; 452 453 if (!inode_owner_or_capable(inode)) 454 return -EACCES; 455 456 if (get_user(flags, (int __user *) arg)) 457 return -EFAULT; 458 459 err = mnt_want_write_file(filp); 460 if (err) 461 return err; 462 463 flags = ext4_mask_flags(inode->i_mode, flags); 464 465 inode_lock(inode); 466 err = ext4_ioctl_setflags(inode, flags); 467 inode_unlock(inode); 468 mnt_drop_write_file(filp); 469 return err; 470 } 471 case EXT4_IOC_GETVERSION: 472 case EXT4_IOC_GETVERSION_OLD: 473 return put_user(inode->i_generation, (int __user *) arg); 474 case EXT4_IOC_SETVERSION: 475 case EXT4_IOC_SETVERSION_OLD: { 476 handle_t *handle; 477 struct ext4_iloc iloc; 478 __u32 generation; 479 int err; 480 481 if (!inode_owner_or_capable(inode)) 482 return -EPERM; 483 484 if (ext4_has_metadata_csum(inode->i_sb)) { 485 ext4_warning(sb, "Setting inode version is not " 486 "supported with metadata_csum enabled."); 487 return -ENOTTY; 488 } 489 490 err = mnt_want_write_file(filp); 491 if (err) 492 return err; 493 if (get_user(generation, (int __user *) arg)) { 494 err = -EFAULT; 495 goto setversion_out; 496 } 497 498 inode_lock(inode); 499 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1); 500 if (IS_ERR(handle)) { 501 err = PTR_ERR(handle); 502 goto unlock_out; 503 } 504 err = ext4_reserve_inode_write(handle, inode, &iloc); 505 if (err == 0) { 506 inode->i_ctime = ext4_current_time(inode); 507 inode->i_generation = generation; 508 err = ext4_mark_iloc_dirty(handle, inode, &iloc); 509 } 510 ext4_journal_stop(handle); 511 512 unlock_out: 513 inode_unlock(inode); 514 setversion_out: 515 mnt_drop_write_file(filp); 516 return err; 517 } 518 case EXT4_IOC_GROUP_EXTEND: { 519 ext4_fsblk_t n_blocks_count; 520 int err, err2=0; 521 522 err = ext4_resize_begin(sb); 523 if (err) 524 return err; 525 526 if (get_user(n_blocks_count, (__u32 __user *)arg)) { 527 err = -EFAULT; 528 goto group_extend_out; 529 } 530 531 if (ext4_has_feature_bigalloc(sb)) { 532 ext4_msg(sb, KERN_ERR, 533 "Online resizing not supported with bigalloc"); 534 err = -EOPNOTSUPP; 535 goto group_extend_out; 536 } 537 538 err = mnt_want_write_file(filp); 539 if (err) 540 goto group_extend_out; 541 542 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count); 543 if (EXT4_SB(sb)->s_journal) { 544 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 545 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 546 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 547 } 548 if (err == 0) 549 err = err2; 550 mnt_drop_write_file(filp); 551 group_extend_out: 552 ext4_resize_end(sb); 553 return err; 554 } 555 556 case EXT4_IOC_MOVE_EXT: { 557 struct move_extent me; 558 struct fd donor; 559 int err; 560 561 if (!(filp->f_mode & FMODE_READ) || 562 !(filp->f_mode & FMODE_WRITE)) 563 return -EBADF; 564 565 if (copy_from_user(&me, 566 (struct move_extent __user *)arg, sizeof(me))) 567 return -EFAULT; 568 me.moved_len = 0; 569 570 donor = fdget(me.donor_fd); 571 if (!donor.file) 572 return -EBADF; 573 574 if (!(donor.file->f_mode & FMODE_WRITE)) { 575 err = -EBADF; 576 goto mext_out; 577 } 578 579 if (ext4_has_feature_bigalloc(sb)) { 580 ext4_msg(sb, KERN_ERR, 581 "Online defrag not supported with bigalloc"); 582 err = -EOPNOTSUPP; 583 goto mext_out; 584 } else if (IS_DAX(inode)) { 585 ext4_msg(sb, KERN_ERR, 586 "Online defrag not supported with DAX"); 587 err = -EOPNOTSUPP; 588 goto mext_out; 589 } 590 591 err = mnt_want_write_file(filp); 592 if (err) 593 goto mext_out; 594 595 err = ext4_move_extents(filp, donor.file, me.orig_start, 596 me.donor_start, me.len, &me.moved_len); 597 mnt_drop_write_file(filp); 598 599 if (copy_to_user((struct move_extent __user *)arg, 600 &me, sizeof(me))) 601 err = -EFAULT; 602 mext_out: 603 fdput(donor); 604 return err; 605 } 606 607 case EXT4_IOC_GROUP_ADD: { 608 struct ext4_new_group_data input; 609 int err, err2=0; 610 611 err = ext4_resize_begin(sb); 612 if (err) 613 return err; 614 615 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg, 616 sizeof(input))) { 617 err = -EFAULT; 618 goto group_add_out; 619 } 620 621 if (ext4_has_feature_bigalloc(sb)) { 622 ext4_msg(sb, KERN_ERR, 623 "Online resizing not supported with bigalloc"); 624 err = -EOPNOTSUPP; 625 goto group_add_out; 626 } 627 628 err = mnt_want_write_file(filp); 629 if (err) 630 goto group_add_out; 631 632 err = ext4_group_add(sb, &input); 633 if (EXT4_SB(sb)->s_journal) { 634 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 635 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 636 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 637 } 638 if (err == 0) 639 err = err2; 640 mnt_drop_write_file(filp); 641 if (!err && ext4_has_group_desc_csum(sb) && 642 test_opt(sb, INIT_INODE_TABLE)) 643 err = ext4_register_li_request(sb, input.group); 644 group_add_out: 645 ext4_resize_end(sb); 646 return err; 647 } 648 649 case EXT4_IOC_MIGRATE: 650 { 651 int err; 652 if (!inode_owner_or_capable(inode)) 653 return -EACCES; 654 655 err = mnt_want_write_file(filp); 656 if (err) 657 return err; 658 /* 659 * inode_mutex prevent write and truncate on the file. 660 * Read still goes through. We take i_data_sem in 661 * ext4_ext_swap_inode_data before we switch the 662 * inode format to prevent read. 663 */ 664 inode_lock((inode)); 665 err = ext4_ext_migrate(inode); 666 inode_unlock((inode)); 667 mnt_drop_write_file(filp); 668 return err; 669 } 670 671 case EXT4_IOC_ALLOC_DA_BLKS: 672 { 673 int err; 674 if (!inode_owner_or_capable(inode)) 675 return -EACCES; 676 677 err = mnt_want_write_file(filp); 678 if (err) 679 return err; 680 err = ext4_alloc_da_blocks(inode); 681 mnt_drop_write_file(filp); 682 return err; 683 } 684 685 case EXT4_IOC_SWAP_BOOT: 686 { 687 int err; 688 if (!(filp->f_mode & FMODE_WRITE)) 689 return -EBADF; 690 err = mnt_want_write_file(filp); 691 if (err) 692 return err; 693 err = swap_inode_boot_loader(sb, inode); 694 mnt_drop_write_file(filp); 695 return err; 696 } 697 698 case EXT4_IOC_RESIZE_FS: { 699 ext4_fsblk_t n_blocks_count; 700 int err = 0, err2 = 0; 701 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count; 702 703 if (ext4_has_feature_bigalloc(sb)) { 704 ext4_msg(sb, KERN_ERR, 705 "Online resizing not (yet) supported with bigalloc"); 706 return -EOPNOTSUPP; 707 } 708 709 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg, 710 sizeof(__u64))) { 711 return -EFAULT; 712 } 713 714 err = ext4_resize_begin(sb); 715 if (err) 716 return err; 717 718 err = mnt_want_write_file(filp); 719 if (err) 720 goto resizefs_out; 721 722 err = ext4_resize_fs(sb, n_blocks_count); 723 if (EXT4_SB(sb)->s_journal) { 724 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal); 725 err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal); 726 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal); 727 } 728 if (err == 0) 729 err = err2; 730 mnt_drop_write_file(filp); 731 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) && 732 ext4_has_group_desc_csum(sb) && 733 test_opt(sb, INIT_INODE_TABLE)) 734 err = ext4_register_li_request(sb, o_group); 735 736 resizefs_out: 737 ext4_resize_end(sb); 738 return err; 739 } 740 741 case FITRIM: 742 { 743 struct request_queue *q = bdev_get_queue(sb->s_bdev); 744 struct fstrim_range range; 745 int ret = 0; 746 747 if (!capable(CAP_SYS_ADMIN)) 748 return -EPERM; 749 750 if (!blk_queue_discard(q)) 751 return -EOPNOTSUPP; 752 753 if (copy_from_user(&range, (struct fstrim_range __user *)arg, 754 sizeof(range))) 755 return -EFAULT; 756 757 range.minlen = max((unsigned int)range.minlen, 758 q->limits.discard_granularity); 759 ret = ext4_trim_fs(sb, &range); 760 if (ret < 0) 761 return ret; 762 763 if (copy_to_user((struct fstrim_range __user *)arg, &range, 764 sizeof(range))) 765 return -EFAULT; 766 767 return 0; 768 } 769 case EXT4_IOC_PRECACHE_EXTENTS: 770 return ext4_ext_precache(inode); 771 case EXT4_IOC_SET_ENCRYPTION_POLICY: { 772 #ifdef CONFIG_EXT4_FS_ENCRYPTION 773 struct fscrypt_policy policy; 774 775 if (copy_from_user(&policy, 776 (struct fscrypt_policy __user *)arg, 777 sizeof(policy))) 778 return -EFAULT; 779 return fscrypt_process_policy(inode, &policy); 780 #else 781 return -EOPNOTSUPP; 782 #endif 783 } 784 case EXT4_IOC_GET_ENCRYPTION_PWSALT: { 785 int err, err2; 786 struct ext4_sb_info *sbi = EXT4_SB(sb); 787 handle_t *handle; 788 789 if (!ext4_sb_has_crypto(sb)) 790 return -EOPNOTSUPP; 791 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) { 792 err = mnt_want_write_file(filp); 793 if (err) 794 return err; 795 handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1); 796 if (IS_ERR(handle)) { 797 err = PTR_ERR(handle); 798 goto pwsalt_err_exit; 799 } 800 err = ext4_journal_get_write_access(handle, sbi->s_sbh); 801 if (err) 802 goto pwsalt_err_journal; 803 generate_random_uuid(sbi->s_es->s_encrypt_pw_salt); 804 err = ext4_handle_dirty_metadata(handle, NULL, 805 sbi->s_sbh); 806 pwsalt_err_journal: 807 err2 = ext4_journal_stop(handle); 808 if (err2 && !err) 809 err = err2; 810 pwsalt_err_exit: 811 mnt_drop_write_file(filp); 812 if (err) 813 return err; 814 } 815 if (copy_to_user((void __user *) arg, 816 sbi->s_es->s_encrypt_pw_salt, 16)) 817 return -EFAULT; 818 return 0; 819 } 820 case EXT4_IOC_GET_ENCRYPTION_POLICY: { 821 #ifdef CONFIG_EXT4_FS_ENCRYPTION 822 struct fscrypt_policy policy; 823 int err = 0; 824 825 if (!ext4_encrypted_inode(inode)) 826 return -ENOENT; 827 err = fscrypt_get_policy(inode, &policy); 828 if (err) 829 return err; 830 if (copy_to_user((void __user *)arg, &policy, sizeof(policy))) 831 return -EFAULT; 832 return 0; 833 #else 834 return -EOPNOTSUPP; 835 #endif 836 } 837 case EXT4_IOC_FSGETXATTR: 838 { 839 struct fsxattr fa; 840 841 memset(&fa, 0, sizeof(struct fsxattr)); 842 ext4_get_inode_flags(ei); 843 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE); 844 845 if (EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, 846 EXT4_FEATURE_RO_COMPAT_PROJECT)) { 847 fa.fsx_projid = (__u32)from_kprojid(&init_user_ns, 848 EXT4_I(inode)->i_projid); 849 } 850 851 if (copy_to_user((struct fsxattr __user *)arg, 852 &fa, sizeof(fa))) 853 return -EFAULT; 854 return 0; 855 } 856 case EXT4_IOC_FSSETXATTR: 857 { 858 struct fsxattr fa; 859 int err; 860 861 if (copy_from_user(&fa, (struct fsxattr __user *)arg, 862 sizeof(fa))) 863 return -EFAULT; 864 865 /* Make sure caller has proper permission */ 866 if (!inode_owner_or_capable(inode)) 867 return -EACCES; 868 869 err = mnt_want_write_file(filp); 870 if (err) 871 return err; 872 873 flags = ext4_xflags_to_iflags(fa.fsx_xflags); 874 flags = ext4_mask_flags(inode->i_mode, flags); 875 876 inode_lock(inode); 877 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) | 878 (flags & EXT4_FL_XFLAG_VISIBLE); 879 err = ext4_ioctl_setflags(inode, flags); 880 inode_unlock(inode); 881 mnt_drop_write_file(filp); 882 if (err) 883 return err; 884 885 err = ext4_ioctl_setproject(filp, fa.fsx_projid); 886 if (err) 887 return err; 888 889 return 0; 890 } 891 default: 892 return -ENOTTY; 893 } 894 } 895 896 #ifdef CONFIG_COMPAT 897 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 898 { 899 /* These are just misnamed, they actually get/put from/to user an int */ 900 switch (cmd) { 901 case EXT4_IOC32_GETFLAGS: 902 cmd = EXT4_IOC_GETFLAGS; 903 break; 904 case EXT4_IOC32_SETFLAGS: 905 cmd = EXT4_IOC_SETFLAGS; 906 break; 907 case EXT4_IOC32_GETVERSION: 908 cmd = EXT4_IOC_GETVERSION; 909 break; 910 case EXT4_IOC32_SETVERSION: 911 cmd = EXT4_IOC_SETVERSION; 912 break; 913 case EXT4_IOC32_GROUP_EXTEND: 914 cmd = EXT4_IOC_GROUP_EXTEND; 915 break; 916 case EXT4_IOC32_GETVERSION_OLD: 917 cmd = EXT4_IOC_GETVERSION_OLD; 918 break; 919 case EXT4_IOC32_SETVERSION_OLD: 920 cmd = EXT4_IOC_SETVERSION_OLD; 921 break; 922 case EXT4_IOC32_GETRSVSZ: 923 cmd = EXT4_IOC_GETRSVSZ; 924 break; 925 case EXT4_IOC32_SETRSVSZ: 926 cmd = EXT4_IOC_SETRSVSZ; 927 break; 928 case EXT4_IOC32_GROUP_ADD: { 929 struct compat_ext4_new_group_input __user *uinput; 930 struct ext4_new_group_input input; 931 mm_segment_t old_fs; 932 int err; 933 934 uinput = compat_ptr(arg); 935 err = get_user(input.group, &uinput->group); 936 err |= get_user(input.block_bitmap, &uinput->block_bitmap); 937 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap); 938 err |= get_user(input.inode_table, &uinput->inode_table); 939 err |= get_user(input.blocks_count, &uinput->blocks_count); 940 err |= get_user(input.reserved_blocks, 941 &uinput->reserved_blocks); 942 if (err) 943 return -EFAULT; 944 old_fs = get_fs(); 945 set_fs(KERNEL_DS); 946 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD, 947 (unsigned long) &input); 948 set_fs(old_fs); 949 return err; 950 } 951 case EXT4_IOC_MOVE_EXT: 952 case EXT4_IOC_RESIZE_FS: 953 case EXT4_IOC_PRECACHE_EXTENTS: 954 case EXT4_IOC_SET_ENCRYPTION_POLICY: 955 case EXT4_IOC_GET_ENCRYPTION_PWSALT: 956 case EXT4_IOC_GET_ENCRYPTION_POLICY: 957 break; 958 default: 959 return -ENOIOCTLCMD; 960 } 961 return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); 962 } 963 #endif 964