1/* 2 * linux/fs/ocfs2/ioctl.c 3 * 4 * Copyright (C) 2006 Herbert Poetzl 5 * adapted from Remy Card's ext2/ioctl.c 6 */ 7 8#include <linux/fs.h> 9#include <linux/mount.h> 10#include <linux/blkdev.h> 11#include <linux/compat.h> 12 13#include <cluster/masklog.h> 14 15#include "ocfs2.h" 16#include "alloc.h" 17#include "dlmglue.h" 18#include "file.h" 19#include "inode.h" 20#include "journal.h" 21 22#include "ocfs2_fs.h" 23#include "ioctl.h" 24#include "resize.h" 25#include "refcounttree.h" 26#include "sysfile.h" 27#include "dir.h" 28#include "buffer_head_io.h" 29#include "suballoc.h" 30#include "move_extents.h" 31 32#define o2info_from_user(a, b) \ 33 copy_from_user(&(a), (b), sizeof(a)) 34#define o2info_to_user(a, b) \ 35 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a)) 36 37/* 38 * This is just a best-effort to tell userspace that this request 39 * caused the error. 40 */ 41static inline void o2info_set_request_error(struct ocfs2_info_request *kreq, 42 struct ocfs2_info_request __user *req) 43{ 44 kreq->ir_flags |= OCFS2_INFO_FL_ERROR; 45 (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags)); 46} 47 48static inline void o2info_set_request_filled(struct ocfs2_info_request *req) 49{ 50 req->ir_flags |= OCFS2_INFO_FL_FILLED; 51} 52 53static inline void o2info_clear_request_filled(struct ocfs2_info_request *req) 54{ 55 req->ir_flags &= ~OCFS2_INFO_FL_FILLED; 56} 57 58static inline int o2info_coherent(struct ocfs2_info_request *req) 59{ 60 return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT)); 61} 62 63static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags) 64{ 65 int status; 66 67 status = ocfs2_inode_lock(inode, NULL, 0); 68 if (status < 0) { 69 mlog_errno(status); 70 return status; 71 } 72 ocfs2_get_inode_flags(OCFS2_I(inode)); 73 *flags = OCFS2_I(inode)->ip_attr; 74 ocfs2_inode_unlock(inode, 0); 75 76 return status; 77} 78 79static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags, 80 unsigned mask) 81{ 82 struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode); 83 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 84 handle_t *handle = NULL; 85 struct buffer_head *bh = NULL; 86 unsigned oldflags; 87 int status; 88 89 mutex_lock(&inode->i_mutex); 90 91 status = ocfs2_inode_lock(inode, &bh, 1); 92 if (status < 0) { 93 mlog_errno(status); 94 goto bail; 95 } 96 97 status = -EACCES; 98 if (!inode_owner_or_capable(inode)) 99 goto bail_unlock; 100 101 if (!S_ISDIR(inode->i_mode)) 102 flags &= ~OCFS2_DIRSYNC_FL; 103 104 oldflags = ocfs2_inode->ip_attr; 105 flags = flags & mask; 106 flags |= oldflags & ~mask; 107 108 /* 109 * The IMMUTABLE and APPEND_ONLY flags can only be changed by 110 * the relevant capability. 111 */ 112 status = -EPERM; 113 if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) & 114 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) { 115 if (!capable(CAP_LINUX_IMMUTABLE)) 116 goto bail_unlock; 117 } 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); 128 129 status = ocfs2_mark_inode_dirty(handle, inode, bh); 130 if (status < 0) 131 mlog_errno(status); 132 133 ocfs2_commit_trans(osb, handle); 134 135bail_unlock: 136 ocfs2_inode_unlock(inode, 1); 137bail: 138 mutex_unlock(&inode->i_mutex); 139 140 brelse(bh); 141 142 return status; 143} 144 145static int ocfs2_info_handle_blocksize(struct inode *inode, 146 struct ocfs2_info_request __user *req) 147{ 148 struct ocfs2_info_blocksize oib; 149 150 if (o2info_from_user(oib, req)) 151 return -EFAULT; 152 153 oib.ib_blocksize = inode->i_sb->s_blocksize; 154 155 o2info_set_request_filled(&oib.ib_req); 156 157 if (o2info_to_user(oib, req)) 158 return -EFAULT; 159 160 return 0; 161} 162 163static int ocfs2_info_handle_clustersize(struct inode *inode, 164 struct ocfs2_info_request __user *req) 165{ 166 struct ocfs2_info_clustersize oic; 167 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 168 169 if (o2info_from_user(oic, req)) 170 return -EFAULT; 171 172 oic.ic_clustersize = osb->s_clustersize; 173 174 o2info_set_request_filled(&oic.ic_req); 175 176 if (o2info_to_user(oic, req)) 177 return -EFAULT; 178 179 return 0; 180} 181 182static int ocfs2_info_handle_maxslots(struct inode *inode, 183 struct ocfs2_info_request __user *req) 184{ 185 struct ocfs2_info_maxslots oim; 186 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 187 188 if (o2info_from_user(oim, req)) 189 return -EFAULT; 190 191 oim.im_max_slots = osb->max_slots; 192 193 o2info_set_request_filled(&oim.im_req); 194 195 if (o2info_to_user(oim, req)) 196 return -EFAULT; 197 198 return 0; 199} 200 201static int ocfs2_info_handle_label(struct inode *inode, 202 struct ocfs2_info_request __user *req) 203{ 204 struct ocfs2_info_label oil; 205 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 206 207 if (o2info_from_user(oil, req)) 208 return -EFAULT; 209 210 memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN); 211 212 o2info_set_request_filled(&oil.il_req); 213 214 if (o2info_to_user(oil, req)) 215 return -EFAULT; 216 217 return 0; 218} 219 220static int ocfs2_info_handle_uuid(struct inode *inode, 221 struct ocfs2_info_request __user *req) 222{ 223 struct ocfs2_info_uuid oiu; 224 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 225 226 if (o2info_from_user(oiu, req)) 227 return -EFAULT; 228 229 memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1); 230 231 o2info_set_request_filled(&oiu.iu_req); 232 233 if (o2info_to_user(oiu, req)) 234 return -EFAULT; 235 236 return 0; 237} 238 239static int ocfs2_info_handle_fs_features(struct inode *inode, 240 struct ocfs2_info_request __user *req) 241{ 242 struct ocfs2_info_fs_features oif; 243 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 244 245 if (o2info_from_user(oif, req)) 246 return -EFAULT; 247 248 oif.if_compat_features = osb->s_feature_compat; 249 oif.if_incompat_features = osb->s_feature_incompat; 250 oif.if_ro_compat_features = osb->s_feature_ro_compat; 251 252 o2info_set_request_filled(&oif.if_req); 253 254 if (o2info_to_user(oif, req)) 255 return -EFAULT; 256 257 return 0; 258} 259 260static int ocfs2_info_handle_journal_size(struct inode *inode, 261 struct ocfs2_info_request __user *req) 262{ 263 struct ocfs2_info_journal_size oij; 264 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 265 266 if (o2info_from_user(oij, req)) 267 return -EFAULT; 268 269 oij.ij_journal_size = i_size_read(osb->journal->j_inode); 270 271 o2info_set_request_filled(&oij.ij_req); 272 273 if (o2info_to_user(oij, req)) 274 return -EFAULT; 275 276 return 0; 277} 278 279static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb, 280 struct inode *inode_alloc, u64 blkno, 281 struct ocfs2_info_freeinode *fi, 282 u32 slot) 283{ 284 int status = 0, unlock = 0; 285 286 struct buffer_head *bh = NULL; 287 struct ocfs2_dinode *dinode_alloc = NULL; 288 289 if (inode_alloc) 290 mutex_lock(&inode_alloc->i_mutex); 291 292 if (o2info_coherent(&fi->ifi_req)) { 293 status = ocfs2_inode_lock(inode_alloc, &bh, 0); 294 if (status < 0) { 295 mlog_errno(status); 296 goto bail; 297 } 298 unlock = 1; 299 } else { 300 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 301 if (status < 0) { 302 mlog_errno(status); 303 goto bail; 304 } 305 } 306 307 dinode_alloc = (struct ocfs2_dinode *)bh->b_data; 308 309 fi->ifi_stat[slot].lfi_total = 310 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total); 311 fi->ifi_stat[slot].lfi_free = 312 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) - 313 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used); 314 315bail: 316 if (unlock) 317 ocfs2_inode_unlock(inode_alloc, 0); 318 319 if (inode_alloc) 320 mutex_unlock(&inode_alloc->i_mutex); 321 322 brelse(bh); 323 324 return status; 325} 326 327static int ocfs2_info_handle_freeinode(struct inode *inode, 328 struct ocfs2_info_request __user *req) 329{ 330 u32 i; 331 u64 blkno = -1; 332 char namebuf[40]; 333 int status, type = INODE_ALLOC_SYSTEM_INODE; 334 struct ocfs2_info_freeinode *oifi = NULL; 335 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 336 struct inode *inode_alloc = NULL; 337 338 oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL); 339 if (!oifi) { 340 status = -ENOMEM; 341 mlog_errno(status); 342 goto out_err; 343 } 344 345 if (o2info_from_user(*oifi, req)) { 346 status = -EFAULT; 347 goto out_free; 348 } 349 350 oifi->ifi_slotnum = osb->max_slots; 351 352 for (i = 0; i < oifi->ifi_slotnum; i++) { 353 if (o2info_coherent(&oifi->ifi_req)) { 354 inode_alloc = ocfs2_get_system_file_inode(osb, type, i); 355 if (!inode_alloc) { 356 mlog(ML_ERROR, "unable to get alloc inode in " 357 "slot %u\n", i); 358 status = -EIO; 359 goto bail; 360 } 361 } else { 362 ocfs2_sprintf_system_inode_name(namebuf, 363 sizeof(namebuf), 364 type, i); 365 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 366 namebuf, 367 strlen(namebuf), 368 &blkno); 369 if (status < 0) { 370 status = -ENOENT; 371 goto bail; 372 } 373 } 374 375 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i); 376 377 iput(inode_alloc); 378 inode_alloc = NULL; 379 380 if (status < 0) 381 goto bail; 382 } 383 384 o2info_set_request_filled(&oifi->ifi_req); 385 386 if (o2info_to_user(*oifi, req)) { 387 status = -EFAULT; 388 goto out_free; 389 } 390 391 status = 0; 392bail: 393 if (status) 394 o2info_set_request_error(&oifi->ifi_req, req); 395out_free: 396 kfree(oifi); 397out_err: 398 return status; 399} 400 401static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist, 402 unsigned int chunksize) 403{ 404 int index; 405 406 index = __ilog2_u32(chunksize); 407 if (index >= OCFS2_INFO_MAX_HIST) 408 index = OCFS2_INFO_MAX_HIST - 1; 409 410 hist->fc_chunks[index]++; 411 hist->fc_clusters[index] += chunksize; 412} 413 414static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats, 415 unsigned int chunksize) 416{ 417 if (chunksize > stats->ffs_max) 418 stats->ffs_max = chunksize; 419 420 if (chunksize < stats->ffs_min) 421 stats->ffs_min = chunksize; 422 423 stats->ffs_avg += chunksize; 424 stats->ffs_free_chunks_real++; 425} 426 427static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg, 428 unsigned int chunksize) 429{ 430 o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize); 431 o2ffg_update_stats(&(ffg->iff_ffs), chunksize); 432} 433 434static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb, 435 struct inode *gb_inode, 436 struct ocfs2_dinode *gb_dinode, 437 struct ocfs2_chain_rec *rec, 438 struct ocfs2_info_freefrag *ffg, 439 u32 chunks_in_group) 440{ 441 int status = 0, used; 442 u64 blkno; 443 444 struct buffer_head *bh = NULL; 445 struct ocfs2_group_desc *bg = NULL; 446 447 unsigned int max_bits, num_clusters; 448 unsigned int offset = 0, cluster, chunk; 449 unsigned int chunk_free, last_chunksize = 0; 450 451 if (!le32_to_cpu(rec->c_free)) 452 goto bail; 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 offset = 0; 486 487 for (chunk = 0; chunk < chunks_in_group; chunk++) { 488 /* 489 * last chunk may be not an entire one. 490 */ 491 if ((offset + ffg->iff_chunksize) > max_bits) 492 num_clusters = max_bits - offset; 493 else 494 num_clusters = ffg->iff_chunksize; 495 496 chunk_free = 0; 497 for (cluster = 0; cluster < num_clusters; cluster++) { 498 used = ocfs2_test_bit(offset, 499 (unsigned long *)bg->bg_bitmap); 500 /* 501 * - chunk_free counts free clusters in #N chunk. 502 * - last_chunksize records the size(in) clusters 503 * for the last real free chunk being counted. 504 */ 505 if (!used) { 506 last_chunksize++; 507 chunk_free++; 508 } 509 510 if (used && last_chunksize) { 511 ocfs2_info_update_ffg(ffg, 512 last_chunksize); 513 last_chunksize = 0; 514 } 515 516 offset++; 517 } 518 519 if (chunk_free == ffg->iff_chunksize) 520 ffg->iff_ffs.ffs_free_chunks++; 521 } 522 523 /* 524 * need to update the info for last free chunk. 525 */ 526 if (last_chunksize) 527 ocfs2_info_update_ffg(ffg, last_chunksize); 528 529 } while (le64_to_cpu(bg->bg_next_group)); 530 531bail: 532 brelse(bh); 533 534 return status; 535} 536 537static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb, 538 struct inode *gb_inode, u64 blkno, 539 struct ocfs2_info_freefrag *ffg) 540{ 541 u32 chunks_in_group; 542 int status = 0, unlock = 0, i; 543 544 struct buffer_head *bh = NULL; 545 struct ocfs2_chain_list *cl = NULL; 546 struct ocfs2_chain_rec *rec = NULL; 547 struct ocfs2_dinode *gb_dinode = NULL; 548 549 if (gb_inode) 550 mutex_lock(&gb_inode->i_mutex); 551 552 if (o2info_coherent(&ffg->iff_req)) { 553 status = ocfs2_inode_lock(gb_inode, &bh, 0); 554 if (status < 0) { 555 mlog_errno(status); 556 goto bail; 557 } 558 unlock = 1; 559 } else { 560 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh); 561 if (status < 0) { 562 mlog_errno(status); 563 goto bail; 564 } 565 } 566 567 gb_dinode = (struct ocfs2_dinode *)bh->b_data; 568 cl = &(gb_dinode->id2.i_chain); 569 570 /* 571 * Chunksize(in) clusters from userspace should be 572 * less than clusters in a group. 573 */ 574 if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) { 575 status = -EINVAL; 576 goto bail; 577 } 578 579 memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats)); 580 581 ffg->iff_ffs.ffs_min = ~0U; 582 ffg->iff_ffs.ffs_clusters = 583 le32_to_cpu(gb_dinode->id1.bitmap1.i_total); 584 ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters - 585 le32_to_cpu(gb_dinode->id1.bitmap1.i_used); 586 587 chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1; 588 589 for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) { 590 rec = &(cl->cl_recs[i]); 591 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode, 592 gb_dinode, 593 rec, ffg, 594 chunks_in_group); 595 if (status) 596 goto bail; 597 } 598 599 if (ffg->iff_ffs.ffs_free_chunks_real) 600 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg / 601 ffg->iff_ffs.ffs_free_chunks_real); 602bail: 603 if (unlock) 604 ocfs2_inode_unlock(gb_inode, 0); 605 606 if (gb_inode) 607 mutex_unlock(&gb_inode->i_mutex); 608 609 if (gb_inode) 610 iput(gb_inode); 611 612 brelse(bh); 613 614 return status; 615} 616 617static int ocfs2_info_handle_freefrag(struct inode *inode, 618 struct ocfs2_info_request __user *req) 619{ 620 u64 blkno = -1; 621 char namebuf[40]; 622 int status, type = GLOBAL_BITMAP_SYSTEM_INODE; 623 624 struct ocfs2_info_freefrag *oiff; 625 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); 626 struct inode *gb_inode = NULL; 627 628 oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL); 629 if (!oiff) { 630 status = -ENOMEM; 631 mlog_errno(status); 632 goto out_err; 633 } 634 635 if (o2info_from_user(*oiff, req)) { 636 status = -EFAULT; 637 goto out_free; 638 } 639 /* 640 * chunksize from userspace should be power of 2. 641 */ 642 if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) || 643 (!oiff->iff_chunksize)) { 644 status = -EINVAL; 645 goto bail; 646 } 647 648 if (o2info_coherent(&oiff->iff_req)) { 649 gb_inode = ocfs2_get_system_file_inode(osb, type, 650 OCFS2_INVALID_SLOT); 651 if (!gb_inode) { 652 mlog(ML_ERROR, "unable to get global_bitmap inode\n"); 653 status = -EIO; 654 goto bail; 655 } 656 } else { 657 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type, 658 OCFS2_INVALID_SLOT); 659 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode, 660 namebuf, 661 strlen(namebuf), 662 &blkno); 663 if (status < 0) { 664 status = -ENOENT; 665 goto bail; 666 } 667 } 668 669 status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff); 670 if (status < 0) 671 goto bail; 672 673 o2info_set_request_filled(&oiff->iff_req); 674 675 if (o2info_to_user(*oiff, req)) { 676 status = -EFAULT; 677 goto out_free; 678 } 679 680 status = 0; 681bail: 682 if (status) 683 o2info_set_request_error(&oiff->iff_req, req); 684out_free: 685 kfree(oiff); 686out_err: 687 return status; 688} 689 690static int ocfs2_info_handle_unknown(struct inode *inode, 691 struct ocfs2_info_request __user *req) 692{ 693 struct ocfs2_info_request oir; 694 695 if (o2info_from_user(oir, req)) 696 return -EFAULT; 697 698 o2info_clear_request_filled(&oir); 699 700 if (o2info_to_user(oir, req)) 701 return -EFAULT; 702 703 return 0; 704} 705 706/* 707 * Validate and distinguish OCFS2_IOC_INFO requests. 708 * 709 * - validate the magic number. 710 * - distinguish different requests. 711 * - validate size of different requests. 712 */ 713static int ocfs2_info_handle_request(struct inode *inode, 714 struct ocfs2_info_request __user *req) 715{ 716 int status = -EFAULT; 717 struct ocfs2_info_request oir; 718 719 if (o2info_from_user(oir, req)) 720 goto bail; 721 722 status = -EINVAL; 723 if (oir.ir_magic != OCFS2_INFO_MAGIC) 724 goto bail; 725 726 switch (oir.ir_code) { 727 case OCFS2_INFO_BLOCKSIZE: 728 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize)) 729 status = ocfs2_info_handle_blocksize(inode, req); 730 break; 731 case OCFS2_INFO_CLUSTERSIZE: 732 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize)) 733 status = ocfs2_info_handle_clustersize(inode, req); 734 break; 735 case OCFS2_INFO_MAXSLOTS: 736 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots)) 737 status = ocfs2_info_handle_maxslots(inode, req); 738 break; 739 case OCFS2_INFO_LABEL: 740 if (oir.ir_size == sizeof(struct ocfs2_info_label)) 741 status = ocfs2_info_handle_label(inode, req); 742 break; 743 case OCFS2_INFO_UUID: 744 if (oir.ir_size == sizeof(struct ocfs2_info_uuid)) 745 status = ocfs2_info_handle_uuid(inode, req); 746 break; 747 case OCFS2_INFO_FS_FEATURES: 748 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features)) 749 status = ocfs2_info_handle_fs_features(inode, req); 750 break; 751 case OCFS2_INFO_JOURNAL_SIZE: 752 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size)) 753 status = ocfs2_info_handle_journal_size(inode, req); 754 break; 755 case OCFS2_INFO_FREEINODE: 756 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode)) 757 status = ocfs2_info_handle_freeinode(inode, req); 758 break; 759 case OCFS2_INFO_FREEFRAG: 760 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag)) 761 status = ocfs2_info_handle_freefrag(inode, req); 762 break; 763 default: 764 status = ocfs2_info_handle_unknown(inode, req); 765 break; 766 } 767 768bail: 769 return status; 770} 771 772static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx, 773 u64 *req_addr, int compat_flag) 774{ 775 int status = -EFAULT; 776 u64 __user *bp = NULL; 777 778 if (compat_flag) { 779#ifdef CONFIG_COMPAT 780 /* 781 * pointer bp stores the base address of a pointers array, 782 * which collects all addresses of separate request. 783 */ 784 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests); 785#else 786 BUG(); 787#endif 788 } else 789 bp = (u64 __user *)(unsigned long)(info->oi_requests); 790 791 if (o2info_from_user(*req_addr, bp + idx)) 792 goto bail; 793 794 status = 0; 795bail: 796 return status; 797} 798 799/* 800 * OCFS2_IOC_INFO handles an array of requests passed from userspace. 801 * 802 * ocfs2_info_handle() recevies a large info aggregation, grab and 803 * validate the request count from header, then break it into small 804 * pieces, later specific handlers can handle them one by one. 805 * 806 * Idea here is to make each separate request small enough to ensure 807 * a better backward&forward compatibility, since a small piece of 808 * request will be less likely to be broken if disk layout get changed. 809 */ 810static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, 811 int compat_flag) 812{ 813 int i, status = 0; 814 u64 req_addr; 815 struct ocfs2_info_request __user *reqp; 816 817 if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) || 818 (!info->oi_requests)) { 819 status = -EINVAL; 820 goto bail; 821 } 822 823 for (i = 0; i < info->oi_count; i++) { 824 825 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag); 826 if (status) 827 break; 828 829 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr; 830 if (!reqp) { 831 status = -EINVAL; 832 goto bail; 833 } 834 835 status = ocfs2_info_handle_request(inode, reqp); 836 if (status) 837 break; 838 } 839 840bail: 841 return status; 842} 843 844long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) 845{ 846 struct inode *inode = file_inode(filp); 847 unsigned int flags; 848 int new_clusters; 849 int status; 850 struct ocfs2_space_resv sr; 851 struct ocfs2_new_group_input input; 852 struct reflink_arguments args; 853 const char __user *old_path; 854 const char __user *new_path; 855 bool preserve; 856 struct ocfs2_info info; 857 void __user *argp = (void __user *)arg; 858 859 switch (cmd) { 860 case OCFS2_IOC_GETFLAGS: 861 status = ocfs2_get_inode_attr(inode, &flags); 862 if (status < 0) 863 return status; 864 865 flags &= OCFS2_FL_VISIBLE; 866 return put_user(flags, (int __user *) arg); 867 case OCFS2_IOC_SETFLAGS: 868 if (get_user(flags, (int __user *) arg)) 869 return -EFAULT; 870 871 status = mnt_want_write_file(filp); 872 if (status) 873 return status; 874 status = ocfs2_set_inode_attr(inode, flags, 875 OCFS2_FL_MODIFIABLE); 876 mnt_drop_write_file(filp); 877 return status; 878 case OCFS2_IOC_RESVSP: 879 case OCFS2_IOC_RESVSP64: 880 case OCFS2_IOC_UNRESVSP: 881 case OCFS2_IOC_UNRESVSP64: 882 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr))) 883 return -EFAULT; 884 885 return ocfs2_change_file_space(filp, cmd, &sr); 886 case OCFS2_IOC_GROUP_EXTEND: 887 if (!capable(CAP_SYS_RESOURCE)) 888 return -EPERM; 889 890 if (get_user(new_clusters, (int __user *)arg)) 891 return -EFAULT; 892 893 status = mnt_want_write_file(filp); 894 if (status) 895 return status; 896 status = ocfs2_group_extend(inode, new_clusters); 897 mnt_drop_write_file(filp); 898 return status; 899 case OCFS2_IOC_GROUP_ADD: 900 case OCFS2_IOC_GROUP_ADD64: 901 if (!capable(CAP_SYS_RESOURCE)) 902 return -EPERM; 903 904 if (copy_from_user(&input, (int __user *) arg, sizeof(input))) 905 return -EFAULT; 906 907 status = mnt_want_write_file(filp); 908 if (status) 909 return status; 910 status = ocfs2_group_add(inode, &input); 911 mnt_drop_write_file(filp); 912 return status; 913 case OCFS2_IOC_REFLINK: 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 case OCFS2_IOC_INFO: 922 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 923 return -EFAULT; 924 925 return ocfs2_info_handle(inode, &info, 0); 926 case FITRIM: 927 { 928 struct super_block *sb = inode->i_sb; 929 struct request_queue *q = bdev_get_queue(sb->s_bdev); 930 struct fstrim_range range; 931 int ret = 0; 932 933 if (!capable(CAP_SYS_ADMIN)) 934 return -EPERM; 935 936 if (!blk_queue_discard(q)) 937 return -EOPNOTSUPP; 938 939 if (copy_from_user(&range, argp, sizeof(range))) 940 return -EFAULT; 941 942 range.minlen = max_t(u64, q->limits.discard_granularity, 943 range.minlen); 944 ret = ocfs2_trim_fs(sb, &range); 945 if (ret < 0) 946 return ret; 947 948 if (copy_to_user(argp, &range, sizeof(range))) 949 return -EFAULT; 950 951 return 0; 952 } 953 case OCFS2_IOC_MOVE_EXT: 954 return ocfs2_ioctl_move_extents(filp, argp); 955 default: 956 return -ENOTTY; 957 } 958} 959 960#ifdef CONFIG_COMPAT 961long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg) 962{ 963 bool preserve; 964 struct reflink_arguments args; 965 struct inode *inode = file_inode(file); 966 struct ocfs2_info info; 967 void __user *argp = (void __user *)arg; 968 969 switch (cmd) { 970 case OCFS2_IOC32_GETFLAGS: 971 cmd = OCFS2_IOC_GETFLAGS; 972 break; 973 case OCFS2_IOC32_SETFLAGS: 974 cmd = OCFS2_IOC_SETFLAGS; 975 break; 976 case OCFS2_IOC_RESVSP: 977 case OCFS2_IOC_RESVSP64: 978 case OCFS2_IOC_UNRESVSP: 979 case OCFS2_IOC_UNRESVSP64: 980 case OCFS2_IOC_GROUP_EXTEND: 981 case OCFS2_IOC_GROUP_ADD: 982 case OCFS2_IOC_GROUP_ADD64: 983 case FITRIM: 984 break; 985 case OCFS2_IOC_REFLINK: 986 if (copy_from_user(&args, argp, sizeof(args))) 987 return -EFAULT; 988 preserve = (args.preserve != 0); 989 990 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path), 991 compat_ptr(args.new_path), preserve); 992 case OCFS2_IOC_INFO: 993 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info))) 994 return -EFAULT; 995 996 return ocfs2_info_handle(inode, &info, 1); 997 case OCFS2_IOC_MOVE_EXT: 998 break; 999 default: 1000 return -ENOIOCTLCMD; 1001 } 1002 1003 return ocfs2_ioctl(file, cmd, arg); 1004} 1005#endif 1006