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