1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/ocfs2/ioctl.c 4 * 5 * Copyright (C) 2006 Herbert Poetzl 6 * adapted from Remy Card's ext2/ioctl.c 7 */ 8 9 #include <linux/fs.h> 10 #include <linux/mount.h> 11 #include <linux/blkdev.h> 12 #include <linux/compat.h> 13 14 #include <cluster/masklog.h> 15 16 #include "ocfs2.h" 17 #include "alloc.h" 18 #include "dlmglue.h" 19 #include "file.h" 20 #include "inode.h" 21 #include "journal.h" 22 23 #include "ocfs2_fs.h" 24 #include "ioctl.h" 25 #include "resize.h" 26 #include "refcounttree.h" 27 #include "sysfile.h" 28 #include "dir.h" 29 #include "buffer_head_io.h" 30 #include "suballoc.h" 31 #include "move_extents.h" 32 33 #define o2info_from_user(a, b) \ 34 copy_from_user(&(a), (b), sizeof(a)) 35 #define o2info_to_user(a, b) \ 36 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a)) 37 38 /* 39 * This is just a best-effort to tell userspace that this request 40 * caused the error. 41 */ 42 static inline void o2info_set_request_error(struct ocfs2_info_request *kreq, 43 struct ocfs2_info_request __user *req) 44 { 45 kreq->ir_flags |= OCFS2_INFO_FL_ERROR; 46 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags)); 47 } 48 49 static inline void o2info_set_request_filled(struct ocfs2_info_request *req) 50 { 51 req->ir_flags |= OCFS2_INFO_FL_FILLED; 52 } 53 54 static inline void o2info_clear_request_filled(struct ocfs2_info_request *req) 55 { 56 req->ir_flags &= ~OCFS2_INFO_FL_FILLED; 57 } 58 59 static inline int o2info_coherent(struct ocfs2_info_request *req) 60 { 61 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT)); 62 } 63 64 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags) 65 { 66 int status; 67 68 status = ocfs2_inode_lock(inode, NULL, 0); 69 if (status < 0) { 70 mlog_errno(status); 71 return status; 72 } 73 ocfs2_get_inode_flags(OCFS2_I(inode)); 74 *flags = OCFS2_I(inode)->ip_attr; 75 ocfs2_inode_unlock(inode, 0); 76 77 return status; 78 } 79 80 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, 81 unsigned mask) 82 { 83 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode); 84 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 85 handle_t *handle = NULL; 86 struct buffer_head *bh = NULL; 87 unsigned oldflags; 88 int status; 89 90 inode_lock(inode); 91 92 status = ocfs2_inode_lock(inode, &bh, 1); 93 if (status < 0) { 94 mlog_errno(status); 95 goto bail; 96 } 97 98 status = -EACCES; 99 if (!inode_owner_or_capable(inode)) 100 goto bail_unlock; 101 102 if (!S_ISDIR(inode->i_mode)) 103 flags &= ~OCFS2_DIRSYNC_FL; 104 105 oldflags = ocfs2_inode->ip_attr; 106 flags = flags & mask; 107 flags |= oldflags & ~mask; 108 109 /* 110 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 111 * the relevant capability. 112 */ 113 status = -EPERM; 114 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) & 115 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) { 116 if (!capable(CAP_LINUX_IMMUTABLE)) 117 goto bail_unlock; 118 } 119 120 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 121 if (IS_ERR(handle)) { 122 status = PTR_ERR(handle); 123 mlog_errno(status); 124 goto bail_unlock; 125 } 126 127 ocfs2_inode->ip_attr = flags; 128 ocfs2_set_inode_flags(inode); 129 130 status = ocfs2_mark_inode_dirty(handle, inode, bh); 131 if (status < 0) 132 mlog_errno(status); 133 134 ocfs2_commit_trans(osb, handle); 135 136 bail_unlock: 137 ocfs2_inode_unlock(inode, 1); 138 bail: 139 inode_unlock(inode); 140 141 brelse(bh); 142 143 return status; 144 } 145 146 static int ocfs2_info_handle_blocksize(struct inode *inode, 147 struct ocfs2_info_request __user *req) 148 { 149 struct ocfs2_info_blocksize oib; 150 151 if (o2info_from_user(oib, req)) 152 return -EFAULT; 153 154 oib.ib_blocksize = inode->i_sb->s_blocksize; 155 156 o2info_set_request_filled(&oib.ib_req); 157 158 if (o2info_to_user(oib, req)) 159 return -EFAULT; 160 161 return 0; 162 } 163 164 static int ocfs2_info_handle_clustersize(struct inode *inode, 165 struct ocfs2_info_request __user *req) 166 { 167 struct ocfs2_info_clustersize oic; 168 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 169 170 if (o2info_from_user(oic, req)) 171 return -EFAULT; 172 173 oic.ic_clustersize = osb->s_clustersize; 174 175 o2info_set_request_filled(&oic.ic_req); 176 177 if (o2info_to_user(oic, req)) 178 return -EFAULT; 179 180 return 0; 181 } 182 183 static int ocfs2_info_handle_maxslots(struct inode *inode, 184 struct ocfs2_info_request __user *req) 185 { 186 struct ocfs2_info_maxslots oim; 187 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 188 189 if (o2info_from_user(oim, req)) 190 return -EFAULT; 191 192 oim.im_max_slots = osb->max_slots; 193 194 o2info_set_request_filled(&oim.im_req); 195 196 if (o2info_to_user(oim, req)) 197 return -EFAULT; 198 199 return 0; 200 } 201 202 static int ocfs2_info_handle_label(struct inode *inode, 203 struct ocfs2_info_request __user *req) 204 { 205 struct ocfs2_info_label oil; 206 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 207 208 if (o2info_from_user(oil, req)) 209 return -EFAULT; 210 211 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN); 212 213 o2info_set_request_filled(&oil.il_req); 214 215 if (o2info_to_user(oil, req)) 216 return -EFAULT; 217 218 return 0; 219 } 220 221 static int ocfs2_info_handle_uuid(struct inode *inode, 222 struct ocfs2_info_request __user *req) 223 { 224 struct ocfs2_info_uuid oiu; 225 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 226 227 if (o2info_from_user(oiu, req)) 228 return -EFAULT; 229 230 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1); 231 232 o2info_set_request_filled(&oiu.iu_req); 233 234 if (o2info_to_user(oiu, req)) 235 return -EFAULT; 236 237 return 0; 238 } 239 240 static int ocfs2_info_handle_fs_features(struct inode *inode, 241 struct ocfs2_info_request __user *req) 242 { 243 struct ocfs2_info_fs_features oif; 244 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 245 246 if (o2info_from_user(oif, req)) 247 return -EFAULT; 248 249 oif.if_compat_features = osb->s_feature_compat; 250 oif.if_incompat_features = osb->s_feature_incompat; 251 oif.if_ro_compat_features = osb->s_feature_ro_compat; 252 253 o2info_set_request_filled(&oif.if_req); 254 255 if (o2info_to_user(oif, req)) 256 return -EFAULT; 257 258 return 0; 259 } 260 261 static int ocfs2_info_handle_journal_size(struct inode *inode, 262 struct ocfs2_info_request __user *req) 263 { 264 struct ocfs2_info_journal_size oij; 265 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 266 267 if (o2info_from_user(oij, req)) 268 return -EFAULT; 269 270 oij.ij_journal_size = i_size_read(osb->journal->j_inode); 271 272 o2info_set_request_filled(&oij.ij_req); 273 274 if (o2info_to_user(oij, req)) 275 return -EFAULT; 276 277 return 0; 278 } 279 280 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb, 281 struct inode *inode_alloc, u64 blkno, 282 struct ocfs2_info_freeinode *fi, 283 u32 slot) 284 { 285 int status = 0, unlock = 0; 286 287 struct buffer_head *bh = NULL; 288 struct ocfs2_dinode *dinode_alloc = NULL; 289 290 if (inode_alloc) 291 inode_lock(inode_alloc); 292 293 if (o2info_coherent(&fi->ifi_req)) { 294 status = ocfs2_inode_lock(inode_alloc, &bh, 0); 295 if (status < 0) { 296 mlog_errno(status); 297 goto bail; 298 } 299 unlock = 1; 300 } else { 301 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 302 if (status < 0) { 303 mlog_errno(status); 304 goto bail; 305 } 306 } 307 308 dinode_alloc = (struct ocfs2_dinode *)bh->b_data; 309 310 fi->ifi_stat[slot].lfi_total = 311 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total); 312 fi->ifi_stat[slot].lfi_free = 313 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) - 314 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used); 315 316 bail: 317 if (unlock) 318 ocfs2_inode_unlock(inode_alloc, 0); 319 320 if (inode_alloc) 321 inode_unlock(inode_alloc); 322 323 brelse(bh); 324 325 return status; 326 } 327 328 static int ocfs2_info_handle_freeinode(struct inode *inode, 329 struct ocfs2_info_request __user *req) 330 { 331 u32 i; 332 u64 blkno = -1; 333 char namebuf[40]; 334 int status, type = INODE_ALLOC_SYSTEM_INODE; 335 struct ocfs2_info_freeinode *oifi = NULL; 336 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 337 struct inode *inode_alloc = NULL; 338 339 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL); 340 if (!oifi) { 341 status = -ENOMEM; 342 mlog_errno(status); 343 goto out_err; 344 } 345 346 if (o2info_from_user(*oifi, req)) { 347 status = -EFAULT; 348 goto out_free; 349 } 350 351 oifi->ifi_slotnum = osb->max_slots; 352 353 for (i = 0; i < oifi->ifi_slotnum; i++) { 354 if (o2info_coherent(&oifi->ifi_req)) { 355 inode_alloc = ocfs2_get_system_file_inode(osb, type, i); 356 if (!inode_alloc) { 357 mlog(ML_ERROR, "unable to get alloc inode in " 358 "slot %u\n", i); 359 status = -EIO; 360 goto bail; 361 } 362 } else { 363 ocfs2_sprintf_system_inode_name(namebuf, 364 sizeof(namebuf), 365 type, i); 366 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 367 namebuf, 368 strlen(namebuf), 369 &blkno); 370 if (status < 0) { 371 status = -ENOENT; 372 goto bail; 373 } 374 } 375 376 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i); 377 378 iput(inode_alloc); 379 inode_alloc = NULL; 380 381 if (status < 0) 382 goto bail; 383 } 384 385 o2info_set_request_filled(&oifi->ifi_req); 386 387 if (o2info_to_user(*oifi, req)) { 388 status = -EFAULT; 389 goto out_free; 390 } 391 392 status = 0; 393 bail: 394 if (status) 395 o2info_set_request_error(&oifi->ifi_req, req); 396 out_free: 397 kfree(oifi); 398 out_err: 399 return status; 400 } 401 402 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist, 403 unsigned int chunksize) 404 { 405 int index; 406 407 index = __ilog2_u32(chunksize); 408 if (index >= OCFS2_INFO_MAX_HIST) 409 index = OCFS2_INFO_MAX_HIST - 1; 410 411 hist->fc_chunks[index]++; 412 hist->fc_clusters[index] += chunksize; 413 } 414 415 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats, 416 unsigned int chunksize) 417 { 418 if (chunksize > stats->ffs_max) 419 stats->ffs_max = chunksize; 420 421 if (chunksize < stats->ffs_min) 422 stats->ffs_min = chunksize; 423 424 stats->ffs_avg += chunksize; 425 stats->ffs_free_chunks_real++; 426 } 427 428 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg, 429 unsigned int chunksize) 430 { 431 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize); 432 o2ffg_update_stats(&(ffg->iff_ffs), chunksize); 433 } 434 435 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb, 436 struct inode *gb_inode, 437 struct ocfs2_dinode *gb_dinode, 438 struct ocfs2_chain_rec *rec, 439 struct ocfs2_info_freefrag *ffg, 440 u32 chunks_in_group) 441 { 442 int status = 0, used; 443 u64 blkno; 444 445 struct buffer_head *bh = NULL; 446 struct ocfs2_group_desc *bg = NULL; 447 448 unsigned int max_bits, num_clusters; 449 unsigned int offset = 0, cluster, chunk; 450 unsigned int chunk_free, last_chunksize = 0; 451 452 if (!le32_to_cpu(rec->c_free)) 453 goto bail; 454 455 do { 456 if (!bg) 457 blkno = le64_to_cpu(rec->c_blkno); 458 else 459 blkno = le64_to_cpu(bg->bg_next_group); 460 461 if (bh) { 462 brelse(bh); 463 bh = NULL; 464 } 465 466 if (o2info_coherent(&ffg->iff_req)) 467 status = ocfs2_read_group_descriptor(gb_inode, 468 gb_dinode, 469 blkno, &bh); 470 else 471 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 472 473 if (status < 0) { 474 mlog(ML_ERROR, "Can't read the group descriptor # " 475 "%llu from device.", (unsigned long long)blkno); 476 status = -EIO; 477 goto bail; 478 } 479 480 bg = (struct ocfs2_group_desc *)bh->b_data; 481 482 if (!le16_to_cpu(bg->bg_free_bits_count)) 483 continue; 484 485 max_bits = le16_to_cpu(bg->bg_bits); 486 offset = 0; 487 488 for (chunk = 0; chunk < chunks_in_group; chunk++) { 489 /* 490 * last chunk may be not an entire one. 491 */ 492 if ((offset + ffg->iff_chunksize) > max_bits) 493 num_clusters = max_bits - offset; 494 else 495 num_clusters = ffg->iff_chunksize; 496 497 chunk_free = 0; 498 for (cluster = 0; cluster < num_clusters; cluster++) { 499 used = ocfs2_test_bit(offset, 500 (unsigned long *)bg->bg_bitmap); 501 /* 502 * - chunk_free counts free clusters in #N chunk. 503 * - last_chunksize records the size(in) clusters 504 * for the last real free chunk being counted. 505 */ 506 if (!used) { 507 last_chunksize++; 508 chunk_free++; 509 } 510 511 if (used && last_chunksize) { 512 ocfs2_info_update_ffg(ffg, 513 last_chunksize); 514 last_chunksize = 0; 515 } 516 517 offset++; 518 } 519 520 if (chunk_free == ffg->iff_chunksize) 521 ffg->iff_ffs.ffs_free_chunks++; 522 } 523 524 /* 525 * need to update the info for last free chunk. 526 */ 527 if (last_chunksize) 528 ocfs2_info_update_ffg(ffg, last_chunksize); 529 530 } while (le64_to_cpu(bg->bg_next_group)); 531 532 bail: 533 brelse(bh); 534 535 return status; 536 } 537 538 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb, 539 struct inode *gb_inode, u64 blkno, 540 struct ocfs2_info_freefrag *ffg) 541 { 542 u32 chunks_in_group; 543 int status = 0, unlock = 0, i; 544 545 struct buffer_head *bh = NULL; 546 struct ocfs2_chain_list *cl = NULL; 547 struct ocfs2_chain_rec *rec = NULL; 548 struct ocfs2_dinode *gb_dinode = NULL; 549 550 if (gb_inode) 551 inode_lock(gb_inode); 552 553 if (o2info_coherent(&ffg->iff_req)) { 554 status = ocfs2_inode_lock(gb_inode, &bh, 0); 555 if (status < 0) { 556 mlog_errno(status); 557 goto bail; 558 } 559 unlock = 1; 560 } else { 561 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 562 if (status < 0) { 563 mlog_errno(status); 564 goto bail; 565 } 566 } 567 568 gb_dinode = (struct ocfs2_dinode *)bh->b_data; 569 cl = &(gb_dinode->id2.i_chain); 570 571 /* 572 * Chunksize(in) clusters from userspace should be 573 * less than clusters in a group. 574 */ 575 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) { 576 status = -EINVAL; 577 goto bail; 578 } 579 580 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats)); 581 582 ffg->iff_ffs.ffs_min = ~0U; 583 ffg->iff_ffs.ffs_clusters = 584 le32_to_cpu(gb_dinode->id1.bitmap1.i_total); 585 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters - 586 le32_to_cpu(gb_dinode->id1.bitmap1.i_used); 587 588 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1; 589 590 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { 591 rec = &(cl->cl_recs[i]); 592 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode, 593 gb_dinode, 594 rec, ffg, 595 chunks_in_group); 596 if (status) 597 goto bail; 598 } 599 600 if (ffg->iff_ffs.ffs_free_chunks_real) 601 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg / 602 ffg->iff_ffs.ffs_free_chunks_real); 603 bail: 604 if (unlock) 605 ocfs2_inode_unlock(gb_inode, 0); 606 607 if (gb_inode) 608 inode_unlock(gb_inode); 609 610 iput(gb_inode); 611 brelse(bh); 612 613 return status; 614 } 615 616 static int ocfs2_info_handle_freefrag(struct inode *inode, 617 struct ocfs2_info_request __user *req) 618 { 619 u64 blkno = -1; 620 char namebuf[40]; 621 int status, type = GLOBAL_BITMAP_SYSTEM_INODE; 622 623 struct ocfs2_info_freefrag *oiff; 624 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 625 struct inode *gb_inode = NULL; 626 627 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL); 628 if (!oiff) { 629 status = -ENOMEM; 630 mlog_errno(status); 631 goto out_err; 632 } 633 634 if (o2info_from_user(*oiff, req)) { 635 status = -EFAULT; 636 goto out_free; 637 } 638 /* 639 * chunksize from userspace should be power of 2. 640 */ 641 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) || 642 (!oiff->iff_chunksize)) { 643 status = -EINVAL; 644 goto bail; 645 } 646 647 if (o2info_coherent(&oiff->iff_req)) { 648 gb_inode = ocfs2_get_system_file_inode(osb, type, 649 OCFS2_INVALID_SLOT); 650 if (!gb_inode) { 651 mlog(ML_ERROR, "unable to get global_bitmap inode\n"); 652 status = -EIO; 653 goto bail; 654 } 655 } else { 656 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, 657 OCFS2_INVALID_SLOT); 658 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 659 namebuf, 660 strlen(namebuf), 661 &blkno); 662 if (status < 0) { 663 status = -ENOENT; 664 goto bail; 665 } 666 } 667 668 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff); 669 if (status < 0) 670 goto bail; 671 672 o2info_set_request_filled(&oiff->iff_req); 673 674 if (o2info_to_user(*oiff, req)) { 675 status = -EFAULT; 676 goto out_free; 677 } 678 679 status = 0; 680 bail: 681 if (status) 682 o2info_set_request_error(&oiff->iff_req, req); 683 out_free: 684 kfree(oiff); 685 out_err: 686 return status; 687 } 688 689 static int ocfs2_info_handle_unknown(struct inode *inode, 690 struct ocfs2_info_request __user *req) 691 { 692 struct ocfs2_info_request oir; 693 694 if (o2info_from_user(oir, req)) 695 return -EFAULT; 696 697 o2info_clear_request_filled(&oir); 698 699 if (o2info_to_user(oir, req)) 700 return -EFAULT; 701 702 return 0; 703 } 704 705 /* 706 * Validate and distinguish OCFS2_IOC_INFO requests. 707 * 708 * - validate the magic number. 709 * - distinguish different requests. 710 * - validate size of different requests. 711 */ 712 static int ocfs2_info_handle_request(struct inode *inode, 713 struct ocfs2_info_request __user *req) 714 { 715 int status = -EFAULT; 716 struct ocfs2_info_request oir; 717 718 if (o2info_from_user(oir, req)) 719 goto bail; 720 721 status = -EINVAL; 722 if (oir.ir_magic != OCFS2_INFO_MAGIC) 723 goto bail; 724 725 switch (oir.ir_code) { 726 case OCFS2_INFO_BLOCKSIZE: 727 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize)) 728 status = ocfs2_info_handle_blocksize(inode, req); 729 break; 730 case OCFS2_INFO_CLUSTERSIZE: 731 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize)) 732 status = ocfs2_info_handle_clustersize(inode, req); 733 break; 734 case OCFS2_INFO_MAXSLOTS: 735 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots)) 736 status = ocfs2_info_handle_maxslots(inode, req); 737 break; 738 case OCFS2_INFO_LABEL: 739 if (oir.ir_size == sizeof(struct ocfs2_info_label)) 740 status = ocfs2_info_handle_label(inode, req); 741 break; 742 case OCFS2_INFO_UUID: 743 if (oir.ir_size == sizeof(struct ocfs2_info_uuid)) 744 status = ocfs2_info_handle_uuid(inode, req); 745 break; 746 case OCFS2_INFO_FS_FEATURES: 747 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features)) 748 status = ocfs2_info_handle_fs_features(inode, req); 749 break; 750 case OCFS2_INFO_JOURNAL_SIZE: 751 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size)) 752 status = ocfs2_info_handle_journal_size(inode, req); 753 break; 754 case OCFS2_INFO_FREEINODE: 755 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode)) 756 status = ocfs2_info_handle_freeinode(inode, req); 757 break; 758 case OCFS2_INFO_FREEFRAG: 759 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag)) 760 status = ocfs2_info_handle_freefrag(inode, req); 761 break; 762 default: 763 status = ocfs2_info_handle_unknown(inode, req); 764 break; 765 } 766 767 bail: 768 return status; 769 } 770 771 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx, 772 u64 *req_addr, int compat_flag) 773 { 774 int status = -EFAULT; 775 u64 __user *bp = NULL; 776 777 if (compat_flag) { 778 #ifdef CONFIG_COMPAT 779 /* 780 * pointer bp stores the base address of a pointers array, 781 * which collects all addresses of separate request. 782 */ 783 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests); 784 #else 785 BUG(); 786 #endif 787 } else 788 bp = (u64 __user *)(unsigned long)(info->oi_requests); 789 790 if (o2info_from_user(*req_addr, bp + idx)) 791 goto bail; 792 793 status = 0; 794 bail: 795 return status; 796 } 797 798 /* 799 * OCFS2_IOC_INFO handles an array of requests passed from userspace. 800 * 801 * ocfs2_info_handle() recevies a large info aggregation, grab and 802 * validate the request count from header, then break it into small 803 * pieces, later specific handlers can handle them one by one. 804 * 805 * Idea here is to make each separate request small enough to ensure 806 * a better backward&forward compatibility, since a small piece of 807 * request will be less likely to be broken if disk layout get changed. 808 */ 809 static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, 810 int compat_flag) 811 { 812 int i, status = 0; 813 u64 req_addr; 814 struct ocfs2_info_request __user *reqp; 815 816 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) || 817 (!info->oi_requests)) { 818 status = -EINVAL; 819 goto bail; 820 } 821 822 for (i = 0; i < info->oi_count; i++) { 823 824 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag); 825 if (status) 826 break; 827 828 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr; 829 if (!reqp) { 830 status = -EINVAL; 831 goto bail; 832 } 833 834 status = ocfs2_info_handle_request(inode, reqp); 835 if (status) 836 break; 837 } 838 839 bail: 840 return status; 841 } 842 843 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 844 { 845 struct inode *inode = file_inode(filp); 846 unsigned int flags; 847 int new_clusters; 848 int status; 849 struct ocfs2_space_resv sr; 850 struct ocfs2_new_group_input input; 851 struct reflink_arguments args; 852 const char __user *old_path; 853 const char __user *new_path; 854 bool preserve; 855 struct ocfs2_info info; 856 void __user *argp = (void __user *)arg; 857 858 switch (cmd) { 859 case OCFS2_IOC_GETFLAGS: 860 status = ocfs2_get_inode_attr(inode, &flags); 861 if (status < 0) 862 return status; 863 864 flags &= OCFS2_FL_VISIBLE; 865 return put_user(flags, (int __user *) arg); 866 case OCFS2_IOC_SETFLAGS: 867 if (get_user(flags, (int __user *) arg)) 868 return -EFAULT; 869 870 status = mnt_want_write_file(filp); 871 if (status) 872 return status; 873 status = ocfs2_set_inode_attr(inode, flags, 874 OCFS2_FL_MODIFIABLE); 875 mnt_drop_write_file(filp); 876 return status; 877 case OCFS2_IOC_RESVSP: 878 case OCFS2_IOC_RESVSP64: 879 case OCFS2_IOC_UNRESVSP: 880 case OCFS2_IOC_UNRESVSP64: 881 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) 882 return -EFAULT; 883 884 return ocfs2_change_file_space(filp, cmd, &sr); 885 case OCFS2_IOC_GROUP_EXTEND: 886 if (!capable(CAP_SYS_RESOURCE)) 887 return -EPERM; 888 889 if (get_user(new_clusters, (int __user *)arg)) 890 return -EFAULT; 891 892 status = mnt_want_write_file(filp); 893 if (status) 894 return status; 895 status = ocfs2_group_extend(inode, new_clusters); 896 mnt_drop_write_file(filp); 897 return status; 898 case OCFS2_IOC_GROUP_ADD: 899 case OCFS2_IOC_GROUP_ADD64: 900 if (!capable(CAP_SYS_RESOURCE)) 901 return -EPERM; 902 903 if (copy_from_user(&input, (int __user *) arg, sizeof(input))) 904 return -EFAULT; 905 906 status = mnt_want_write_file(filp); 907 if (status) 908 return status; 909 status = ocfs2_group_add(inode, &input); 910 mnt_drop_write_file(filp); 911 return status; 912 case OCFS2_IOC_REFLINK: 913 if (copy_from_user(&args, argp, sizeof(args))) 914 return -EFAULT; 915 old_path = (const char __user *)(unsigned long)args.old_path; 916 new_path = (const char __user *)(unsigned long)args.new_path; 917 preserve = (args.preserve != 0); 918 919 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve); 920 case OCFS2_IOC_INFO: 921 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 922 return -EFAULT; 923 924 return ocfs2_info_handle(inode, &info, 0); 925 case FITRIM: 926 { 927 struct super_block *sb = inode->i_sb; 928 struct request_queue *q = bdev_get_queue(sb->s_bdev); 929 struct fstrim_range range; 930 int ret = 0; 931 932 if (!capable(CAP_SYS_ADMIN)) 933 return -EPERM; 934 935 if (!blk_queue_discard(q)) 936 return -EOPNOTSUPP; 937 938 if (copy_from_user(&range, argp, sizeof(range))) 939 return -EFAULT; 940 941 range.minlen = max_t(u64, q->limits.discard_granularity, 942 range.minlen); 943 ret = ocfs2_trim_fs(sb, &range); 944 if (ret < 0) 945 return ret; 946 947 if (copy_to_user(argp, &range, sizeof(range))) 948 return -EFAULT; 949 950 return 0; 951 } 952 case OCFS2_IOC_MOVE_EXT: 953 return ocfs2_ioctl_move_extents(filp, argp); 954 default: 955 return -ENOTTY; 956 } 957 } 958 959 #ifdef CONFIG_COMPAT 960 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 961 { 962 bool preserve; 963 struct reflink_arguments args; 964 struct inode *inode = file_inode(file); 965 struct ocfs2_info info; 966 void __user *argp = (void __user *)arg; 967 968 switch (cmd) { 969 case OCFS2_IOC32_GETFLAGS: 970 cmd = OCFS2_IOC_GETFLAGS; 971 break; 972 case OCFS2_IOC32_SETFLAGS: 973 cmd = OCFS2_IOC_SETFLAGS; 974 break; 975 case OCFS2_IOC_RESVSP: 976 case OCFS2_IOC_RESVSP64: 977 case OCFS2_IOC_UNRESVSP: 978 case OCFS2_IOC_UNRESVSP64: 979 case OCFS2_IOC_GROUP_EXTEND: 980 case OCFS2_IOC_GROUP_ADD: 981 case OCFS2_IOC_GROUP_ADD64: 982 break; 983 case OCFS2_IOC_REFLINK: 984 if (copy_from_user(&args, argp, sizeof(args))) 985 return -EFAULT; 986 preserve = (args.preserve != 0); 987 988 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path), 989 compat_ptr(args.new_path), preserve); 990 case OCFS2_IOC_INFO: 991 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 992 return -EFAULT; 993 994 return ocfs2_info_handle(inode, &info, 1); 995 case OCFS2_IOC_MOVE_EXT: 996 break; 997 default: 998 return -ENOIOCTLCMD; 999 } 1000 1001 return ocfs2_ioctl(file, cmd, arg); 1002 } 1003 #endif 1004