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 #include <linux/fileattr.h> 14 15 #include <cluster/masklog.h> 16 17 #include "ocfs2.h" 18 #include "alloc.h" 19 #include "dlmglue.h" 20 #include "file.h" 21 #include "inode.h" 22 #include "journal.h" 23 24 #include "ocfs2_fs.h" 25 #include "ioctl.h" 26 #include "resize.h" 27 #include "refcounttree.h" 28 #include "sysfile.h" 29 #include "dir.h" 30 #include "buffer_head_io.h" 31 #include "suballoc.h" 32 #include "move_extents.h" 33 34 #define o2info_from_user(a, b) \ 35 copy_from_user(&(a), (b), sizeof(a)) 36 #define o2info_to_user(a, b) \ 37 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a)) 38 39 /* 40 * This is just a best-effort to tell userspace that this request 41 * caused the error. 42 */ 43 static inline void o2info_set_request_error(struct ocfs2_info_request *kreq, 44 struct ocfs2_info_request __user *req) 45 { 46 kreq->ir_flags |= OCFS2_INFO_FL_ERROR; 47 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags)); 48 } 49 50 static inline void o2info_set_request_filled(struct ocfs2_info_request *req) 51 { 52 req->ir_flags |= OCFS2_INFO_FL_FILLED; 53 } 54 55 static inline void o2info_clear_request_filled(struct ocfs2_info_request *req) 56 { 57 req->ir_flags &= ~OCFS2_INFO_FL_FILLED; 58 } 59 60 static inline int o2info_coherent(struct ocfs2_info_request *req) 61 { 62 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT)); 63 } 64 65 int ocfs2_fileattr_get(struct dentry *dentry, struct file_kattr *fa) 66 { 67 struct inode *inode = d_inode(dentry); 68 unsigned int flags; 69 int status; 70 71 status = ocfs2_inode_lock(inode, NULL, 0); 72 if (status < 0) { 73 mlog_errno(status); 74 return status; 75 } 76 ocfs2_get_inode_flags(OCFS2_I(inode)); 77 flags = OCFS2_I(inode)->ip_attr; 78 ocfs2_inode_unlock(inode, 0); 79 80 fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE); 81 82 return status; 83 } 84 85 int ocfs2_fileattr_set(struct mnt_idmap *idmap, 86 struct dentry *dentry, struct file_kattr *fa) 87 { 88 struct inode *inode = d_inode(dentry); 89 unsigned int flags = fa->flags; 90 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode); 91 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 92 handle_t *handle = NULL; 93 struct buffer_head *bh = NULL; 94 unsigned oldflags; 95 int status; 96 97 if (fileattr_has_fsx(fa)) 98 return -EOPNOTSUPP; 99 100 status = ocfs2_inode_lock(inode, &bh, 1); 101 if (status < 0) { 102 mlog_errno(status); 103 goto bail; 104 } 105 106 if (!S_ISDIR(inode->i_mode)) 107 flags &= ~OCFS2_DIRSYNC_FL; 108 109 oldflags = ocfs2_inode->ip_attr; 110 flags = flags & OCFS2_FL_MODIFIABLE; 111 flags |= oldflags & ~OCFS2_FL_MODIFIABLE; 112 113 /* Check already done by VFS, but repeat with ocfs lock */ 114 status = -EPERM; 115 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && 116 !capable(CAP_LINUX_IMMUTABLE)) 117 goto bail_unlock; 118 119 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS); 120 if (IS_ERR(handle)) { 121 status = PTR_ERR(handle); 122 mlog_errno(status); 123 goto bail_unlock; 124 } 125 126 ocfs2_inode->ip_attr = flags; 127 ocfs2_set_inode_flags(inode); 128 inode_set_ctime_current(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 brelse(bh); 140 141 return status; 142 } 143 144 static int ocfs2_info_handle_blocksize(struct inode *inode, 145 struct ocfs2_info_request __user *req) 146 { 147 struct ocfs2_info_blocksize oib; 148 149 if (o2info_from_user(oib, req)) 150 return -EFAULT; 151 152 oib.ib_blocksize = inode->i_sb->s_blocksize; 153 154 o2info_set_request_filled(&oib.ib_req); 155 156 if (o2info_to_user(oib, req)) 157 return -EFAULT; 158 159 return 0; 160 } 161 162 static int ocfs2_info_handle_clustersize(struct inode *inode, 163 struct ocfs2_info_request __user *req) 164 { 165 struct ocfs2_info_clustersize oic; 166 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 167 168 if (o2info_from_user(oic, req)) 169 return -EFAULT; 170 171 oic.ic_clustersize = osb->s_clustersize; 172 173 o2info_set_request_filled(&oic.ic_req); 174 175 if (o2info_to_user(oic, req)) 176 return -EFAULT; 177 178 return 0; 179 } 180 181 static int ocfs2_info_handle_maxslots(struct inode *inode, 182 struct ocfs2_info_request __user *req) 183 { 184 struct ocfs2_info_maxslots oim; 185 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 186 187 if (o2info_from_user(oim, req)) 188 return -EFAULT; 189 190 oim.im_max_slots = osb->max_slots; 191 192 o2info_set_request_filled(&oim.im_req); 193 194 if (o2info_to_user(oim, req)) 195 return -EFAULT; 196 197 return 0; 198 } 199 200 static int ocfs2_info_handle_label(struct inode *inode, 201 struct ocfs2_info_request __user *req) 202 { 203 struct ocfs2_info_label oil; 204 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 205 206 if (o2info_from_user(oil, req)) 207 return -EFAULT; 208 209 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN); 210 211 o2info_set_request_filled(&oil.il_req); 212 213 if (o2info_to_user(oil, req)) 214 return -EFAULT; 215 216 return 0; 217 } 218 219 static int ocfs2_info_handle_uuid(struct inode *inode, 220 struct ocfs2_info_request __user *req) 221 { 222 struct ocfs2_info_uuid oiu; 223 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 224 225 if (o2info_from_user(oiu, req)) 226 return -EFAULT; 227 228 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1); 229 230 o2info_set_request_filled(&oiu.iu_req); 231 232 if (o2info_to_user(oiu, req)) 233 return -EFAULT; 234 235 return 0; 236 } 237 238 static int ocfs2_info_handle_fs_features(struct inode *inode, 239 struct ocfs2_info_request __user *req) 240 { 241 struct ocfs2_info_fs_features oif; 242 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 243 244 if (o2info_from_user(oif, req)) 245 return -EFAULT; 246 247 oif.if_compat_features = osb->s_feature_compat; 248 oif.if_incompat_features = osb->s_feature_incompat; 249 oif.if_ro_compat_features = osb->s_feature_ro_compat; 250 251 o2info_set_request_filled(&oif.if_req); 252 253 if (o2info_to_user(oif, req)) 254 return -EFAULT; 255 256 return 0; 257 } 258 259 static int ocfs2_info_handle_journal_size(struct inode *inode, 260 struct ocfs2_info_request __user *req) 261 { 262 struct ocfs2_info_journal_size oij; 263 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 264 265 if (o2info_from_user(oij, req)) 266 return -EFAULT; 267 268 oij.ij_journal_size = i_size_read(osb->journal->j_inode); 269 270 o2info_set_request_filled(&oij.ij_req); 271 272 if (o2info_to_user(oij, req)) 273 return -EFAULT; 274 275 return 0; 276 } 277 278 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb, 279 struct inode *inode_alloc, u64 blkno, 280 struct ocfs2_info_freeinode *fi, 281 u32 slot) 282 { 283 int status = 0, unlock = 0; 284 285 struct buffer_head *bh = NULL; 286 struct ocfs2_dinode *dinode_alloc = NULL; 287 288 if (inode_alloc) 289 inode_lock(inode_alloc); 290 291 if (inode_alloc && o2info_coherent(&fi->ifi_req)) { 292 status = ocfs2_inode_lock(inode_alloc, &bh, 0); 293 if (status < 0) { 294 mlog_errno(status); 295 goto bail; 296 } 297 unlock = 1; 298 } else { 299 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 300 if (status < 0) { 301 mlog_errno(status); 302 goto bail; 303 } 304 } 305 306 dinode_alloc = (struct ocfs2_dinode *)bh->b_data; 307 308 fi->ifi_stat[slot].lfi_total = 309 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total); 310 fi->ifi_stat[slot].lfi_free = 311 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) - 312 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used); 313 314 bail: 315 if (unlock) 316 ocfs2_inode_unlock(inode_alloc, 0); 317 318 if (inode_alloc) 319 inode_unlock(inode_alloc); 320 321 brelse(bh); 322 323 return status; 324 } 325 326 static int ocfs2_info_handle_freeinode(struct inode *inode, 327 struct ocfs2_info_request __user *req) 328 { 329 u32 i; 330 u64 blkno = -1; 331 char namebuf[40]; 332 int status, type = INODE_ALLOC_SYSTEM_INODE; 333 struct ocfs2_info_freeinode *oifi = NULL; 334 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 335 struct inode *inode_alloc = NULL; 336 337 oifi = kzalloc_obj(struct ocfs2_info_freeinode); 338 if (!oifi) { 339 status = -ENOMEM; 340 mlog_errno(status); 341 goto out_err; 342 } 343 344 if (o2info_from_user(*oifi, req)) { 345 status = -EFAULT; 346 goto out_free; 347 } 348 349 oifi->ifi_slotnum = osb->max_slots; 350 351 for (i = 0; i < oifi->ifi_slotnum; i++) { 352 if (o2info_coherent(&oifi->ifi_req)) { 353 inode_alloc = ocfs2_get_system_file_inode(osb, type, i); 354 if (!inode_alloc) { 355 mlog(ML_ERROR, "unable to get alloc inode in " 356 "slot %u\n", i); 357 status = -EIO; 358 goto bail; 359 } 360 } else { 361 int len = ocfs2_sprintf_system_inode_name(namebuf, 362 sizeof(namebuf), 363 type, i); 364 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 365 namebuf, len, &blkno); 366 if (status < 0) { 367 status = -ENOENT; 368 goto bail; 369 } 370 } 371 372 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i); 373 374 iput(inode_alloc); 375 inode_alloc = NULL; 376 377 if (status < 0) 378 goto bail; 379 } 380 381 o2info_set_request_filled(&oifi->ifi_req); 382 383 if (o2info_to_user(*oifi, req)) { 384 status = -EFAULT; 385 goto out_free; 386 } 387 388 status = 0; 389 bail: 390 if (status) 391 o2info_set_request_error(&oifi->ifi_req, req); 392 out_free: 393 kfree(oifi); 394 out_err: 395 return status; 396 } 397 398 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist, 399 unsigned int chunksize) 400 { 401 u32 index; 402 403 index = __ilog2_u32(chunksize); 404 if (index >= OCFS2_INFO_MAX_HIST) 405 index = OCFS2_INFO_MAX_HIST - 1; 406 407 hist->fc_chunks[index]++; 408 hist->fc_clusters[index] += chunksize; 409 } 410 411 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats, 412 unsigned int chunksize) 413 { 414 if (chunksize > stats->ffs_max) 415 stats->ffs_max = chunksize; 416 417 if (chunksize < stats->ffs_min) 418 stats->ffs_min = chunksize; 419 420 stats->ffs_avg += chunksize; 421 stats->ffs_free_chunks_real++; 422 } 423 424 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg, 425 unsigned int chunksize) 426 { 427 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize); 428 o2ffg_update_stats(&(ffg->iff_ffs), chunksize); 429 } 430 431 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb, 432 struct inode *gb_inode, 433 struct ocfs2_dinode *gb_dinode, 434 struct ocfs2_chain_rec *rec, 435 struct ocfs2_info_freefrag *ffg, 436 u32 chunks_in_group) 437 { 438 int status = 0, used; 439 u64 blkno; 440 441 struct buffer_head *bh = NULL; 442 struct ocfs2_group_desc *bg = NULL; 443 444 unsigned int max_bits, max_bitmap_bits, num_clusters; 445 unsigned int offset = 0, cluster, chunk; 446 unsigned int chunk_free, last_chunksize = 0; 447 448 if (!le32_to_cpu(rec->c_free)) 449 goto bail; 450 451 max_bitmap_bits = 8 * ocfs2_group_bitmap_size(osb->sb, 0, 452 osb->s_feature_incompat); 453 454 do { 455 if (!bg) 456 blkno = le64_to_cpu(rec->c_blkno); 457 else 458 blkno = le64_to_cpu(bg->bg_next_group); 459 460 if (bh) { 461 brelse(bh); 462 bh = NULL; 463 } 464 465 if (o2info_coherent(&ffg->iff_req)) 466 status = ocfs2_read_group_descriptor(gb_inode, 467 gb_dinode, 468 blkno, &bh); 469 else 470 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 471 472 if (status < 0) { 473 mlog(ML_ERROR, "Can't read the group descriptor # " 474 "%llu from device.", (unsigned long long)blkno); 475 status = -EIO; 476 goto bail; 477 } 478 479 bg = (struct ocfs2_group_desc *)bh->b_data; 480 481 if (!le16_to_cpu(bg->bg_free_bits_count)) 482 continue; 483 484 max_bits = le16_to_cpu(bg->bg_bits); 485 486 /* 487 * Non-coherent scans read raw blocks and do not get the 488 * bg_bits validation from 489 * ocfs2_read_group_descriptor(). 490 */ 491 if (max_bits > max_bitmap_bits) { 492 mlog(ML_ERROR, 493 "Group desc #%llu has %u bits, max bitmap bits %u\n", 494 (unsigned long long)blkno, max_bits, max_bitmap_bits); 495 max_bits = max_bitmap_bits; 496 } 497 498 offset = 0; 499 500 for (chunk = 0; chunk < chunks_in_group; chunk++) { 501 /* 502 * last chunk may be not an entire one. 503 */ 504 if ((offset + ffg->iff_chunksize) > max_bits) 505 num_clusters = max_bits - offset; 506 else 507 num_clusters = ffg->iff_chunksize; 508 509 chunk_free = 0; 510 for (cluster = 0; cluster < num_clusters; cluster++) { 511 used = ocfs2_test_bit(offset, 512 (unsigned long *)bg->bg_bitmap); 513 /* 514 * - chunk_free counts free clusters in #N chunk. 515 * - last_chunksize records the size(in) clusters 516 * for the last real free chunk being counted. 517 */ 518 if (!used) { 519 last_chunksize++; 520 chunk_free++; 521 } 522 523 if (used && last_chunksize) { 524 ocfs2_info_update_ffg(ffg, 525 last_chunksize); 526 last_chunksize = 0; 527 } 528 529 offset++; 530 } 531 532 if (chunk_free == ffg->iff_chunksize) 533 ffg->iff_ffs.ffs_free_chunks++; 534 } 535 536 /* 537 * need to update the info for last free chunk. 538 */ 539 if (last_chunksize) 540 ocfs2_info_update_ffg(ffg, last_chunksize); 541 542 } while (le64_to_cpu(bg->bg_next_group)); 543 544 bail: 545 brelse(bh); 546 547 return status; 548 } 549 550 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb, 551 struct inode *gb_inode, u64 blkno, 552 struct ocfs2_info_freefrag *ffg) 553 { 554 u32 chunks_in_group; 555 int status = 0, unlock = 0, i; 556 557 struct buffer_head *bh = NULL; 558 struct ocfs2_chain_list *cl = NULL; 559 struct ocfs2_chain_rec *rec = NULL; 560 struct ocfs2_dinode *gb_dinode = NULL; 561 562 if (gb_inode) 563 inode_lock(gb_inode); 564 565 if (o2info_coherent(&ffg->iff_req)) { 566 status = ocfs2_inode_lock(gb_inode, &bh, 0); 567 if (status < 0) { 568 mlog_errno(status); 569 goto bail; 570 } 571 unlock = 1; 572 } else { 573 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 574 if (status < 0) { 575 mlog_errno(status); 576 goto bail; 577 } 578 } 579 580 gb_dinode = (struct ocfs2_dinode *)bh->b_data; 581 cl = &(gb_dinode->id2.i_chain); 582 583 /* 584 * Chunksize(in) clusters from userspace should be 585 * less than clusters in a group. 586 */ 587 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) { 588 status = -EINVAL; 589 goto bail; 590 } 591 592 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats)); 593 594 ffg->iff_ffs.ffs_min = ~0U; 595 ffg->iff_ffs.ffs_clusters = 596 le32_to_cpu(gb_dinode->id1.bitmap1.i_total); 597 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters - 598 le32_to_cpu(gb_dinode->id1.bitmap1.i_used); 599 600 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1; 601 602 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { 603 rec = &(cl->cl_recs[i]); 604 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode, 605 gb_dinode, 606 rec, ffg, 607 chunks_in_group); 608 if (status) 609 goto bail; 610 } 611 612 if (ffg->iff_ffs.ffs_free_chunks_real) 613 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg / 614 ffg->iff_ffs.ffs_free_chunks_real); 615 bail: 616 if (unlock) 617 ocfs2_inode_unlock(gb_inode, 0); 618 619 if (gb_inode) 620 inode_unlock(gb_inode); 621 622 iput(gb_inode); 623 brelse(bh); 624 625 return status; 626 } 627 628 static int ocfs2_info_handle_freefrag(struct inode *inode, 629 struct ocfs2_info_request __user *req) 630 { 631 u64 blkno = -1; 632 char namebuf[40]; 633 int status, type = GLOBAL_BITMAP_SYSTEM_INODE; 634 635 struct ocfs2_info_freefrag *oiff; 636 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 637 struct inode *gb_inode = NULL; 638 639 oiff = kzalloc_obj(struct ocfs2_info_freefrag); 640 if (!oiff) { 641 status = -ENOMEM; 642 mlog_errno(status); 643 goto out_err; 644 } 645 646 if (o2info_from_user(*oiff, req)) { 647 status = -EFAULT; 648 goto out_free; 649 } 650 /* 651 * chunksize from userspace should be power of 2. 652 */ 653 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) || 654 (!oiff->iff_chunksize)) { 655 status = -EINVAL; 656 goto bail; 657 } 658 659 if (o2info_coherent(&oiff->iff_req)) { 660 gb_inode = ocfs2_get_system_file_inode(osb, type, 661 OCFS2_INVALID_SLOT); 662 if (!gb_inode) { 663 mlog(ML_ERROR, "unable to get global_bitmap inode\n"); 664 status = -EIO; 665 goto bail; 666 } 667 } else { 668 int len = ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), 669 type, OCFS2_INVALID_SLOT); 670 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 671 namebuf, len, &blkno); 672 if (status < 0) { 673 status = -ENOENT; 674 goto bail; 675 } 676 } 677 678 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff); 679 if (status < 0) 680 goto bail; 681 682 o2info_set_request_filled(&oiff->iff_req); 683 684 if (o2info_to_user(*oiff, req)) { 685 status = -EFAULT; 686 goto out_free; 687 } 688 689 status = 0; 690 bail: 691 if (status) 692 o2info_set_request_error(&oiff->iff_req, req); 693 out_free: 694 kfree(oiff); 695 out_err: 696 return status; 697 } 698 699 static int ocfs2_info_handle_unknown(struct inode *inode, 700 struct ocfs2_info_request __user *req) 701 { 702 struct ocfs2_info_request oir; 703 704 if (o2info_from_user(oir, req)) 705 return -EFAULT; 706 707 o2info_clear_request_filled(&oir); 708 709 if (o2info_to_user(oir, req)) 710 return -EFAULT; 711 712 return 0; 713 } 714 715 /* 716 * Validate and distinguish OCFS2_IOC_INFO requests. 717 * 718 * - validate the magic number. 719 * - distinguish different requests. 720 * - validate size of different requests. 721 */ 722 static int ocfs2_info_handle_request(struct inode *inode, 723 struct ocfs2_info_request __user *req) 724 { 725 int status = -EFAULT; 726 struct ocfs2_info_request oir; 727 728 if (o2info_from_user(oir, req)) 729 goto bail; 730 731 status = -EINVAL; 732 if (oir.ir_magic != OCFS2_INFO_MAGIC) 733 goto bail; 734 735 switch (oir.ir_code) { 736 case OCFS2_INFO_BLOCKSIZE: 737 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize)) 738 status = ocfs2_info_handle_blocksize(inode, req); 739 break; 740 case OCFS2_INFO_CLUSTERSIZE: 741 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize)) 742 status = ocfs2_info_handle_clustersize(inode, req); 743 break; 744 case OCFS2_INFO_MAXSLOTS: 745 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots)) 746 status = ocfs2_info_handle_maxslots(inode, req); 747 break; 748 case OCFS2_INFO_LABEL: 749 if (oir.ir_size == sizeof(struct ocfs2_info_label)) 750 status = ocfs2_info_handle_label(inode, req); 751 break; 752 case OCFS2_INFO_UUID: 753 if (oir.ir_size == sizeof(struct ocfs2_info_uuid)) 754 status = ocfs2_info_handle_uuid(inode, req); 755 break; 756 case OCFS2_INFO_FS_FEATURES: 757 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features)) 758 status = ocfs2_info_handle_fs_features(inode, req); 759 break; 760 case OCFS2_INFO_JOURNAL_SIZE: 761 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size)) 762 status = ocfs2_info_handle_journal_size(inode, req); 763 break; 764 case OCFS2_INFO_FREEINODE: 765 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode)) 766 status = ocfs2_info_handle_freeinode(inode, req); 767 break; 768 case OCFS2_INFO_FREEFRAG: 769 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag)) 770 status = ocfs2_info_handle_freefrag(inode, req); 771 break; 772 default: 773 status = ocfs2_info_handle_unknown(inode, req); 774 break; 775 } 776 777 bail: 778 return status; 779 } 780 781 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx, 782 u64 *req_addr, int compat_flag) 783 { 784 int status = -EFAULT; 785 u64 __user *bp = NULL; 786 787 if (compat_flag) { 788 #ifdef CONFIG_COMPAT 789 /* 790 * pointer bp stores the base address of a pointers array, 791 * which collects all addresses of separate request. 792 */ 793 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests); 794 #else 795 BUG(); 796 #endif 797 } else 798 bp = (u64 __user *)(unsigned long)(info->oi_requests); 799 800 if (o2info_from_user(*req_addr, bp + idx)) 801 goto bail; 802 803 status = 0; 804 bail: 805 return status; 806 } 807 808 /* 809 * OCFS2_IOC_INFO handles an array of requests passed from userspace. 810 * 811 * ocfs2_info_handle() receives a large info aggregation, grab and 812 * validate the request count from header, then break it into small 813 * pieces, later specific handlers can handle them one by one. 814 * 815 * Idea here is to make each separate request small enough to ensure 816 * a better backward&forward compatibility, since a small piece of 817 * request will be less likely to be broken if disk layout get changed. 818 */ 819 static noinline_for_stack int 820 ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag) 821 { 822 int i, status = 0; 823 u64 req_addr; 824 struct ocfs2_info_request __user *reqp; 825 826 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) || 827 (!info->oi_requests)) { 828 status = -EINVAL; 829 goto bail; 830 } 831 832 for (i = 0; i < info->oi_count; i++) { 833 834 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag); 835 if (status) 836 break; 837 838 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr; 839 if (!reqp) { 840 status = -EINVAL; 841 goto bail; 842 } 843 844 status = ocfs2_info_handle_request(inode, reqp); 845 if (status) 846 break; 847 } 848 849 bail: 850 return status; 851 } 852 853 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 854 { 855 struct inode *inode = file_inode(filp); 856 void __user *argp = (void __user *)arg; 857 int status; 858 859 switch (cmd) { 860 case OCFS2_IOC_RESVSP: 861 case OCFS2_IOC_RESVSP64: 862 case OCFS2_IOC_UNRESVSP: 863 case OCFS2_IOC_UNRESVSP64: 864 { 865 struct ocfs2_space_resv sr; 866 867 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) 868 return -EFAULT; 869 870 return ocfs2_change_file_space(filp, cmd, &sr); 871 } 872 case OCFS2_IOC_GROUP_EXTEND: 873 { 874 int new_clusters; 875 876 if (!capable(CAP_SYS_RESOURCE)) 877 return -EPERM; 878 879 if (get_user(new_clusters, (int __user *)arg)) 880 return -EFAULT; 881 882 status = mnt_want_write_file(filp); 883 if (status) 884 return status; 885 status = ocfs2_group_extend(inode, new_clusters); 886 mnt_drop_write_file(filp); 887 return status; 888 } 889 case OCFS2_IOC_GROUP_ADD: 890 case OCFS2_IOC_GROUP_ADD64: 891 { 892 struct ocfs2_new_group_input input; 893 894 if (!capable(CAP_SYS_RESOURCE)) 895 return -EPERM; 896 897 if (copy_from_user(&input, (int __user *) arg, sizeof(input))) 898 return -EFAULT; 899 900 status = mnt_want_write_file(filp); 901 if (status) 902 return status; 903 status = ocfs2_group_add(inode, &input); 904 mnt_drop_write_file(filp); 905 return status; 906 } 907 case OCFS2_IOC_REFLINK: 908 { 909 struct reflink_arguments args; 910 const char __user *old_path; 911 const char __user *new_path; 912 bool preserve; 913 914 if (copy_from_user(&args, argp, sizeof(args))) 915 return -EFAULT; 916 old_path = (const char __user *)(unsigned long)args.old_path; 917 new_path = (const char __user *)(unsigned long)args.new_path; 918 preserve = (args.preserve != 0); 919 920 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve); 921 } 922 case OCFS2_IOC_INFO: 923 { 924 struct ocfs2_info info; 925 926 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 927 return -EFAULT; 928 929 return ocfs2_info_handle(inode, &info, 0); 930 } 931 case FITRIM: 932 { 933 struct super_block *sb = inode->i_sb; 934 struct fstrim_range range; 935 int ret = 0; 936 937 if (!capable(CAP_SYS_ADMIN)) 938 return -EPERM; 939 940 if (!bdev_max_discard_sectors(sb->s_bdev)) 941 return -EOPNOTSUPP; 942 943 if (copy_from_user(&range, argp, sizeof(range))) 944 return -EFAULT; 945 946 range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev), 947 range.minlen); 948 ret = ocfs2_trim_fs(sb, &range); 949 if (ret < 0) 950 return ret; 951 952 if (copy_to_user(argp, &range, sizeof(range))) 953 return -EFAULT; 954 955 return 0; 956 } 957 case OCFS2_IOC_MOVE_EXT: 958 return ocfs2_ioctl_move_extents(filp, argp); 959 default: 960 return -ENOTTY; 961 } 962 } 963 964 #ifdef CONFIG_COMPAT 965 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 966 { 967 bool preserve; 968 struct reflink_arguments args; 969 struct inode *inode = file_inode(file); 970 struct ocfs2_info info; 971 void __user *argp = (void __user *)arg; 972 973 switch (cmd) { 974 case OCFS2_IOC_RESVSP: 975 case OCFS2_IOC_RESVSP64: 976 case OCFS2_IOC_UNRESVSP: 977 case OCFS2_IOC_UNRESVSP64: 978 case OCFS2_IOC_GROUP_EXTEND: 979 case OCFS2_IOC_GROUP_ADD: 980 case OCFS2_IOC_GROUP_ADD64: 981 break; 982 case OCFS2_IOC_REFLINK: 983 if (copy_from_user(&args, argp, sizeof(args))) 984 return -EFAULT; 985 preserve = (args.preserve != 0); 986 987 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path), 988 compat_ptr(args.new_path), preserve); 989 case OCFS2_IOC_INFO: 990 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 991 return -EFAULT; 992 993 return ocfs2_info_handle(inode, &info, 1); 994 case FITRIM: 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