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 fileattr *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 fileattr *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(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL); 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 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, 366 strlen(namebuf), 367 &blkno); 368 if (status < 0) { 369 status = -ENOENT; 370 goto bail; 371 } 372 } 373 374 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i); 375 376 iput(inode_alloc); 377 inode_alloc = NULL; 378 379 if (status < 0) 380 goto bail; 381 } 382 383 o2info_set_request_filled(&oifi->ifi_req); 384 385 if (o2info_to_user(*oifi, req)) { 386 status = -EFAULT; 387 goto out_free; 388 } 389 390 status = 0; 391 bail: 392 if (status) 393 o2info_set_request_error(&oifi->ifi_req, req); 394 out_free: 395 kfree(oifi); 396 out_err: 397 return status; 398 } 399 400 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist, 401 unsigned int chunksize) 402 { 403 u32 index; 404 405 index = __ilog2_u32(chunksize); 406 if (index >= OCFS2_INFO_MAX_HIST) 407 index = OCFS2_INFO_MAX_HIST - 1; 408 409 hist->fc_chunks[index]++; 410 hist->fc_clusters[index] += chunksize; 411 } 412 413 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats, 414 unsigned int chunksize) 415 { 416 if (chunksize > stats->ffs_max) 417 stats->ffs_max = chunksize; 418 419 if (chunksize < stats->ffs_min) 420 stats->ffs_min = chunksize; 421 422 stats->ffs_avg += chunksize; 423 stats->ffs_free_chunks_real++; 424 } 425 426 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg, 427 unsigned int chunksize) 428 { 429 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize); 430 o2ffg_update_stats(&(ffg->iff_ffs), chunksize); 431 } 432 433 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb, 434 struct inode *gb_inode, 435 struct ocfs2_dinode *gb_dinode, 436 struct ocfs2_chain_rec *rec, 437 struct ocfs2_info_freefrag *ffg, 438 u32 chunks_in_group) 439 { 440 int status = 0, used; 441 u64 blkno; 442 443 struct buffer_head *bh = NULL; 444 struct ocfs2_group_desc *bg = NULL; 445 446 unsigned int max_bits, num_clusters; 447 unsigned int offset = 0, cluster, chunk; 448 unsigned int chunk_free, last_chunksize = 0; 449 450 if (!le32_to_cpu(rec->c_free)) 451 goto bail; 452 453 do { 454 if (!bg) 455 blkno = le64_to_cpu(rec->c_blkno); 456 else 457 blkno = le64_to_cpu(bg->bg_next_group); 458 459 if (bh) { 460 brelse(bh); 461 bh = NULL; 462 } 463 464 if (o2info_coherent(&ffg->iff_req)) 465 status = ocfs2_read_group_descriptor(gb_inode, 466 gb_dinode, 467 blkno, &bh); 468 else 469 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 470 471 if (status < 0) { 472 mlog(ML_ERROR, "Can't read the group descriptor # " 473 "%llu from device.", (unsigned long long)blkno); 474 status = -EIO; 475 goto bail; 476 } 477 478 bg = (struct ocfs2_group_desc *)bh->b_data; 479 480 if (!le16_to_cpu(bg->bg_free_bits_count)) 481 continue; 482 483 max_bits = le16_to_cpu(bg->bg_bits); 484 offset = 0; 485 486 for (chunk = 0; chunk < chunks_in_group; chunk++) { 487 /* 488 * last chunk may be not an entire one. 489 */ 490 if ((offset + ffg->iff_chunksize) > max_bits) 491 num_clusters = max_bits - offset; 492 else 493 num_clusters = ffg->iff_chunksize; 494 495 chunk_free = 0; 496 for (cluster = 0; cluster < num_clusters; cluster++) { 497 used = ocfs2_test_bit(offset, 498 (unsigned long *)bg->bg_bitmap); 499 /* 500 * - chunk_free counts free clusters in #N chunk. 501 * - last_chunksize records the size(in) clusters 502 * for the last real free chunk being counted. 503 */ 504 if (!used) { 505 last_chunksize++; 506 chunk_free++; 507 } 508 509 if (used && last_chunksize) { 510 ocfs2_info_update_ffg(ffg, 511 last_chunksize); 512 last_chunksize = 0; 513 } 514 515 offset++; 516 } 517 518 if (chunk_free == ffg->iff_chunksize) 519 ffg->iff_ffs.ffs_free_chunks++; 520 } 521 522 /* 523 * need to update the info for last free chunk. 524 */ 525 if (last_chunksize) 526 ocfs2_info_update_ffg(ffg, last_chunksize); 527 528 } while (le64_to_cpu(bg->bg_next_group)); 529 530 bail: 531 brelse(bh); 532 533 return status; 534 } 535 536 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb, 537 struct inode *gb_inode, u64 blkno, 538 struct ocfs2_info_freefrag *ffg) 539 { 540 u32 chunks_in_group; 541 int status = 0, unlock = 0, i; 542 543 struct buffer_head *bh = NULL; 544 struct ocfs2_chain_list *cl = NULL; 545 struct ocfs2_chain_rec *rec = NULL; 546 struct ocfs2_dinode *gb_dinode = NULL; 547 548 if (gb_inode) 549 inode_lock(gb_inode); 550 551 if (o2info_coherent(&ffg->iff_req)) { 552 status = ocfs2_inode_lock(gb_inode, &bh, 0); 553 if (status < 0) { 554 mlog_errno(status); 555 goto bail; 556 } 557 unlock = 1; 558 } else { 559 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 560 if (status < 0) { 561 mlog_errno(status); 562 goto bail; 563 } 564 } 565 566 gb_dinode = (struct ocfs2_dinode *)bh->b_data; 567 cl = &(gb_dinode->id2.i_chain); 568 569 /* 570 * Chunksize(in) clusters from userspace should be 571 * less than clusters in a group. 572 */ 573 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) { 574 status = -EINVAL; 575 goto bail; 576 } 577 578 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats)); 579 580 ffg->iff_ffs.ffs_min = ~0U; 581 ffg->iff_ffs.ffs_clusters = 582 le32_to_cpu(gb_dinode->id1.bitmap1.i_total); 583 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters - 584 le32_to_cpu(gb_dinode->id1.bitmap1.i_used); 585 586 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1; 587 588 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { 589 rec = &(cl->cl_recs[i]); 590 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode, 591 gb_dinode, 592 rec, ffg, 593 chunks_in_group); 594 if (status) 595 goto bail; 596 } 597 598 if (ffg->iff_ffs.ffs_free_chunks_real) 599 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg / 600 ffg->iff_ffs.ffs_free_chunks_real); 601 bail: 602 if (unlock) 603 ocfs2_inode_unlock(gb_inode, 0); 604 605 if (gb_inode) 606 inode_unlock(gb_inode); 607 608 iput(gb_inode); 609 brelse(bh); 610 611 return status; 612 } 613 614 static int ocfs2_info_handle_freefrag(struct inode *inode, 615 struct ocfs2_info_request __user *req) 616 { 617 u64 blkno = -1; 618 char namebuf[40]; 619 int status, type = GLOBAL_BITMAP_SYSTEM_INODE; 620 621 struct ocfs2_info_freefrag *oiff; 622 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 623 struct inode *gb_inode = NULL; 624 625 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL); 626 if (!oiff) { 627 status = -ENOMEM; 628 mlog_errno(status); 629 goto out_err; 630 } 631 632 if (o2info_from_user(*oiff, req)) { 633 status = -EFAULT; 634 goto out_free; 635 } 636 /* 637 * chunksize from userspace should be power of 2. 638 */ 639 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) || 640 (!oiff->iff_chunksize)) { 641 status = -EINVAL; 642 goto bail; 643 } 644 645 if (o2info_coherent(&oiff->iff_req)) { 646 gb_inode = ocfs2_get_system_file_inode(osb, type, 647 OCFS2_INVALID_SLOT); 648 if (!gb_inode) { 649 mlog(ML_ERROR, "unable to get global_bitmap inode\n"); 650 status = -EIO; 651 goto bail; 652 } 653 } else { 654 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, 655 OCFS2_INVALID_SLOT); 656 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 657 namebuf, 658 strlen(namebuf), 659 &blkno); 660 if (status < 0) { 661 status = -ENOENT; 662 goto bail; 663 } 664 } 665 666 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff); 667 if (status < 0) 668 goto bail; 669 670 o2info_set_request_filled(&oiff->iff_req); 671 672 if (o2info_to_user(*oiff, req)) { 673 status = -EFAULT; 674 goto out_free; 675 } 676 677 status = 0; 678 bail: 679 if (status) 680 o2info_set_request_error(&oiff->iff_req, req); 681 out_free: 682 kfree(oiff); 683 out_err: 684 return status; 685 } 686 687 static int ocfs2_info_handle_unknown(struct inode *inode, 688 struct ocfs2_info_request __user *req) 689 { 690 struct ocfs2_info_request oir; 691 692 if (o2info_from_user(oir, req)) 693 return -EFAULT; 694 695 o2info_clear_request_filled(&oir); 696 697 if (o2info_to_user(oir, req)) 698 return -EFAULT; 699 700 return 0; 701 } 702 703 /* 704 * Validate and distinguish OCFS2_IOC_INFO requests. 705 * 706 * - validate the magic number. 707 * - distinguish different requests. 708 * - validate size of different requests. 709 */ 710 static int ocfs2_info_handle_request(struct inode *inode, 711 struct ocfs2_info_request __user *req) 712 { 713 int status = -EFAULT; 714 struct ocfs2_info_request oir; 715 716 if (o2info_from_user(oir, req)) 717 goto bail; 718 719 status = -EINVAL; 720 if (oir.ir_magic != OCFS2_INFO_MAGIC) 721 goto bail; 722 723 switch (oir.ir_code) { 724 case OCFS2_INFO_BLOCKSIZE: 725 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize)) 726 status = ocfs2_info_handle_blocksize(inode, req); 727 break; 728 case OCFS2_INFO_CLUSTERSIZE: 729 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize)) 730 status = ocfs2_info_handle_clustersize(inode, req); 731 break; 732 case OCFS2_INFO_MAXSLOTS: 733 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots)) 734 status = ocfs2_info_handle_maxslots(inode, req); 735 break; 736 case OCFS2_INFO_LABEL: 737 if (oir.ir_size == sizeof(struct ocfs2_info_label)) 738 status = ocfs2_info_handle_label(inode, req); 739 break; 740 case OCFS2_INFO_UUID: 741 if (oir.ir_size == sizeof(struct ocfs2_info_uuid)) 742 status = ocfs2_info_handle_uuid(inode, req); 743 break; 744 case OCFS2_INFO_FS_FEATURES: 745 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features)) 746 status = ocfs2_info_handle_fs_features(inode, req); 747 break; 748 case OCFS2_INFO_JOURNAL_SIZE: 749 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size)) 750 status = ocfs2_info_handle_journal_size(inode, req); 751 break; 752 case OCFS2_INFO_FREEINODE: 753 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode)) 754 status = ocfs2_info_handle_freeinode(inode, req); 755 break; 756 case OCFS2_INFO_FREEFRAG: 757 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag)) 758 status = ocfs2_info_handle_freefrag(inode, req); 759 break; 760 default: 761 status = ocfs2_info_handle_unknown(inode, req); 762 break; 763 } 764 765 bail: 766 return status; 767 } 768 769 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx, 770 u64 *req_addr, int compat_flag) 771 { 772 int status = -EFAULT; 773 u64 __user *bp = NULL; 774 775 if (compat_flag) { 776 #ifdef CONFIG_COMPAT 777 /* 778 * pointer bp stores the base address of a pointers array, 779 * which collects all addresses of separate request. 780 */ 781 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests); 782 #else 783 BUG(); 784 #endif 785 } else 786 bp = (u64 __user *)(unsigned long)(info->oi_requests); 787 788 if (o2info_from_user(*req_addr, bp + idx)) 789 goto bail; 790 791 status = 0; 792 bail: 793 return status; 794 } 795 796 /* 797 * OCFS2_IOC_INFO handles an array of requests passed from userspace. 798 * 799 * ocfs2_info_handle() recevies a large info aggregation, grab and 800 * validate the request count from header, then break it into small 801 * pieces, later specific handlers can handle them one by one. 802 * 803 * Idea here is to make each separate request small enough to ensure 804 * a better backward&forward compatibility, since a small piece of 805 * request will be less likely to be broken if disk layout get changed. 806 */ 807 static noinline_for_stack int 808 ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag) 809 { 810 int i, status = 0; 811 u64 req_addr; 812 struct ocfs2_info_request __user *reqp; 813 814 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) || 815 (!info->oi_requests)) { 816 status = -EINVAL; 817 goto bail; 818 } 819 820 for (i = 0; i < info->oi_count; i++) { 821 822 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag); 823 if (status) 824 break; 825 826 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr; 827 if (!reqp) { 828 status = -EINVAL; 829 goto bail; 830 } 831 832 status = ocfs2_info_handle_request(inode, reqp); 833 if (status) 834 break; 835 } 836 837 bail: 838 return status; 839 } 840 841 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 842 { 843 struct inode *inode = file_inode(filp); 844 void __user *argp = (void __user *)arg; 845 int status; 846 847 switch (cmd) { 848 case OCFS2_IOC_RESVSP: 849 case OCFS2_IOC_RESVSP64: 850 case OCFS2_IOC_UNRESVSP: 851 case OCFS2_IOC_UNRESVSP64: 852 { 853 struct ocfs2_space_resv sr; 854 855 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) 856 return -EFAULT; 857 858 return ocfs2_change_file_space(filp, cmd, &sr); 859 } 860 case OCFS2_IOC_GROUP_EXTEND: 861 { 862 int new_clusters; 863 864 if (!capable(CAP_SYS_RESOURCE)) 865 return -EPERM; 866 867 if (get_user(new_clusters, (int __user *)arg)) 868 return -EFAULT; 869 870 status = mnt_want_write_file(filp); 871 if (status) 872 return status; 873 status = ocfs2_group_extend(inode, new_clusters); 874 mnt_drop_write_file(filp); 875 return status; 876 } 877 case OCFS2_IOC_GROUP_ADD: 878 case OCFS2_IOC_GROUP_ADD64: 879 { 880 struct ocfs2_new_group_input input; 881 882 if (!capable(CAP_SYS_RESOURCE)) 883 return -EPERM; 884 885 if (copy_from_user(&input, (int __user *) arg, sizeof(input))) 886 return -EFAULT; 887 888 status = mnt_want_write_file(filp); 889 if (status) 890 return status; 891 status = ocfs2_group_add(inode, &input); 892 mnt_drop_write_file(filp); 893 return status; 894 } 895 case OCFS2_IOC_REFLINK: 896 { 897 struct reflink_arguments args; 898 const char __user *old_path; 899 const char __user *new_path; 900 bool preserve; 901 902 if (copy_from_user(&args, argp, sizeof(args))) 903 return -EFAULT; 904 old_path = (const char __user *)(unsigned long)args.old_path; 905 new_path = (const char __user *)(unsigned long)args.new_path; 906 preserve = (args.preserve != 0); 907 908 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve); 909 } 910 case OCFS2_IOC_INFO: 911 { 912 struct ocfs2_info info; 913 914 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 915 return -EFAULT; 916 917 return ocfs2_info_handle(inode, &info, 0); 918 } 919 case FITRIM: 920 { 921 struct super_block *sb = inode->i_sb; 922 struct fstrim_range range; 923 int ret = 0; 924 925 if (!capable(CAP_SYS_ADMIN)) 926 return -EPERM; 927 928 if (!bdev_max_discard_sectors(sb->s_bdev)) 929 return -EOPNOTSUPP; 930 931 if (copy_from_user(&range, argp, sizeof(range))) 932 return -EFAULT; 933 934 range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev), 935 range.minlen); 936 ret = ocfs2_trim_fs(sb, &range); 937 if (ret < 0) 938 return ret; 939 940 if (copy_to_user(argp, &range, sizeof(range))) 941 return -EFAULT; 942 943 return 0; 944 } 945 case OCFS2_IOC_MOVE_EXT: 946 return ocfs2_ioctl_move_extents(filp, argp); 947 default: 948 return -ENOTTY; 949 } 950 } 951 952 #ifdef CONFIG_COMPAT 953 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 954 { 955 bool preserve; 956 struct reflink_arguments args; 957 struct inode *inode = file_inode(file); 958 struct ocfs2_info info; 959 void __user *argp = (void __user *)arg; 960 961 switch (cmd) { 962 case OCFS2_IOC_RESVSP: 963 case OCFS2_IOC_RESVSP64: 964 case OCFS2_IOC_UNRESVSP: 965 case OCFS2_IOC_UNRESVSP64: 966 case OCFS2_IOC_GROUP_EXTEND: 967 case OCFS2_IOC_GROUP_ADD: 968 case OCFS2_IOC_GROUP_ADD64: 969 break; 970 case OCFS2_IOC_REFLINK: 971 if (copy_from_user(&args, argp, sizeof(args))) 972 return -EFAULT; 973 preserve = (args.preserve != 0); 974 975 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path), 976 compat_ptr(args.new_path), preserve); 977 case OCFS2_IOC_INFO: 978 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 979 return -EFAULT; 980 981 return ocfs2_info_handle(inode, &info, 1); 982 case FITRIM: 983 case OCFS2_IOC_MOVE_EXT: 984 break; 985 default: 986 return -ENOIOCTLCMD; 987 } 988 989 return ocfs2_ioctl(file, cmd, arg); 990 } 991 #endif 992