fs/ocfs2/ioctl.c

   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 call is void because we are already reporting an error that may
  39  * be -EFAULT.  The error will be returned from the ioctl(2) call.  It's
  40  * just a best-effort to tell userspace that this request caused the error.
  41  */
  42 static inline void o2info_set_request_error(struct ocfs2_info_request *kreq,
  43                                         struct ocfs2_info_request __user *req)
  44 {
  45         kreq->ir_flags |= OCFS2_INFO_FL_ERROR;
  46         (void)put_user(kreq->ir_flags, (__u32 __user *)&(req->ir_flags));
  47 }
  48
  49 static inline void o2info_set_request_filled(struct ocfs2_info_request *req)
  50 {
  51         req->ir_flags |= OCFS2_INFO_FL_FILLED;
  52 }
  53
  54 static inline void o2info_clear_request_filled(struct ocfs2_info_request *req)
  55 {
  56         req->ir_flags &= ~OCFS2_INFO_FL_FILLED;
  57 }
  58
  59 static inline int o2info_coherent(struct ocfs2_info_request *req)
  60 {
  61         return (!(req->ir_flags & OCFS2_INFO_FL_NON_COHERENT));
  62 }
  63
  64 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
  65 {
  66         int status;
  67
  68         status = ocfs2_inode_lock(inode, NULL, 0);
  69         if (status < 0) {
  70                 mlog_errno(status);
  71                 return status;
  72         }
  73         ocfs2_get_inode_flags(OCFS2_I(inode));
  74         *flags = OCFS2_I(inode)->ip_attr;
  75         ocfs2_inode_unlock(inode, 0);
  76
  77         return status;
  78 }
  79
  80 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
  81                                 unsigned mask)
  82 {
  83         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  84         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  85         handle_t *handle = NULL;
  86         struct buffer_head *bh = NULL;
  87         unsigned oldflags;
  88         int status;
  89
  90         mutex_lock(&inode->i_mutex);
  91
  92         status = ocfs2_inode_lock(inode, &bh, 1);
  93         if (status < 0) {
  94                 mlog_errno(status);
  95                 goto bail;
  96         }
  97
  98         status = -EACCES;
  99         if (!inode_owner_or_capable(inode))
 100                 goto bail_unlock;
 101
 102         if (!S_ISDIR(inode->i_mode))
 103                 flags &= ~OCFS2_DIRSYNC_FL;
 104
 105         oldflags = ocfs2_inode->ip_attr;
 106         flags = flags & mask;
 107         flags |= oldflags & ~mask;
 108
 109         /*
 110          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 111          * the relevant capability.
 112          */
 113         status = -EPERM;
 114         if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
 115                 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
 116                 if (!capable(CAP_LINUX_IMMUTABLE))
 117                         goto bail_unlock;
 118         }
 119
 120         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 121         if (IS_ERR(handle)) {
 122                 status = PTR_ERR(handle);
 123                 mlog_errno(status);
 124                 goto bail_unlock;
 125         }
 126
 127         ocfs2_inode->ip_attr = flags;
 128         ocfs2_set_inode_flags(inode);
 129
 130         status = ocfs2_mark_inode_dirty(handle, inode, bh);
 131         if (status < 0)
 132                 mlog_errno(status);
 133
 134         ocfs2_commit_trans(osb, handle);
 135
 136 bail_unlock:
 137         ocfs2_inode_unlock(inode, 1);
 138 bail:
 139         mutex_unlock(&inode->i_mutex);
 140
 141         brelse(bh);
 142
 143         return status;
 144 }
 145
 146 int ocfs2_info_handle_blocksize(struct inode *inode,
 147                                 struct ocfs2_info_request __user *req)
 148 {
 149         int status = -EFAULT;
 150         struct ocfs2_info_blocksize oib;
 151
 152         if (o2info_from_user(oib, req))
 153                 goto bail;
 154
 155         oib.ib_blocksize = inode->i_sb->s_blocksize;
 156
 157         o2info_set_request_filled(&oib.ib_req);
 158
 159         if (o2info_to_user(oib, req))
 160                 goto bail;
 161
 162         status = 0;
 163 bail:
 164         if (status)
 165                 o2info_set_request_error(&oib.ib_req, req);
 166
 167         return status;
 168 }
 169
 170 int ocfs2_info_handle_clustersize(struct inode *inode,
 171                                   struct ocfs2_info_request __user *req)
 172 {
 173         int status = -EFAULT;
 174         struct ocfs2_info_clustersize oic;
 175         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 176
 177         if (o2info_from_user(oic, req))
 178                 goto bail;
 179
 180         oic.ic_clustersize = osb->s_clustersize;
 181
 182         o2info_set_request_filled(&oic.ic_req);
 183
 184         if (o2info_to_user(oic, req))
 185                 goto bail;
 186
 187         status = 0;
 188 bail:
 189         if (status)
 190                 o2info_set_request_error(&oic.ic_req, req);
 191
 192         return status;
 193 }
 194
 195 int ocfs2_info_handle_maxslots(struct inode *inode,
 196                                struct ocfs2_info_request __user *req)
 197 {
 198         int status = -EFAULT;
 199         struct ocfs2_info_maxslots oim;
 200         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 201
 202         if (o2info_from_user(oim, req))
 203                 goto bail;
 204
 205         oim.im_max_slots = osb->max_slots;
 206
 207         o2info_set_request_filled(&oim.im_req);
 208
 209         if (o2info_to_user(oim, req))
 210                 goto bail;
 211
 212         status = 0;
 213 bail:
 214         if (status)
 215                 o2info_set_request_error(&oim.im_req, req);
 216
 217         return status;
 218 }
 219
 220 int ocfs2_info_handle_label(struct inode *inode,
 221                             struct ocfs2_info_request __user *req)
 222 {
 223         int status = -EFAULT;
 224         struct ocfs2_info_label oil;
 225         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 226
 227         if (o2info_from_user(oil, req))
 228                 goto bail;
 229
 230         memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
 231
 232         o2info_set_request_filled(&oil.il_req);
 233
 234         if (o2info_to_user(oil, req))
 235                 goto bail;
 236
 237         status = 0;
 238 bail:
 239         if (status)
 240                 o2info_set_request_error(&oil.il_req, req);
 241
 242         return status;
 243 }
 244
 245 int ocfs2_info_handle_uuid(struct inode *inode,
 246                            struct ocfs2_info_request __user *req)
 247 {
 248         int status = -EFAULT;
 249         struct ocfs2_info_uuid oiu;
 250         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 251
 252         if (o2info_from_user(oiu, req))
 253                 goto bail;
 254
 255         memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
 256
 257         o2info_set_request_filled(&oiu.iu_req);
 258
 259         if (o2info_to_user(oiu, req))
 260                 goto bail;
 261
 262         status = 0;
 263 bail:
 264         if (status)
 265                 o2info_set_request_error(&oiu.iu_req, req);
 266
 267         return status;
 268 }
 269
 270 int ocfs2_info_handle_fs_features(struct inode *inode,
 271                                   struct ocfs2_info_request __user *req)
 272 {
 273         int status = -EFAULT;
 274         struct ocfs2_info_fs_features oif;
 275         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 276
 277         if (o2info_from_user(oif, req))
 278                 goto bail;
 279
 280         oif.if_compat_features = osb->s_feature_compat;
 281         oif.if_incompat_features = osb->s_feature_incompat;
 282         oif.if_ro_compat_features = osb->s_feature_ro_compat;
 283
 284         o2info_set_request_filled(&oif.if_req);
 285
 286         if (o2info_to_user(oif, req))
 287                 goto bail;
 288
 289         status = 0;
 290 bail:
 291         if (status)
 292                 o2info_set_request_error(&oif.if_req, req);
 293
 294         return status;
 295 }
 296
 297 int ocfs2_info_handle_journal_size(struct inode *inode,
 298                                    struct ocfs2_info_request __user *req)
 299 {
 300         int status = -EFAULT;
 301         struct ocfs2_info_journal_size oij;
 302         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 303
 304         if (o2info_from_user(oij, req))
 305                 goto bail;
 306
 307         oij.ij_journal_size = i_size_read(osb->journal->j_inode);
 308
 309         o2info_set_request_filled(&oij.ij_req);
 310
 311         if (o2info_to_user(oij, req))
 312                 goto bail;
 313
 314         status = 0;
 315 bail:
 316         if (status)
 317                 o2info_set_request_error(&oij.ij_req, req);
 318
 319         return status;
 320 }
 321
 322 int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
 323                                 struct inode *inode_alloc, u64 blkno,
 324                                 struct ocfs2_info_freeinode *fi, u32 slot)
 325 {
 326         int status = 0, unlock = 0;
 327
 328         struct buffer_head *bh = NULL;
 329         struct ocfs2_dinode *dinode_alloc = NULL;
 330
 331         if (inode_alloc)
 332                 mutex_lock(&inode_alloc->i_mutex);
 333
 334         if (o2info_coherent(&fi->ifi_req)) {
 335                 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
 336                 if (status < 0) {
 337                         mlog_errno(status);
 338                         goto bail;
 339                 }
 340                 unlock = 1;
 341         } else {
 342                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 343                 if (status < 0) {
 344                         mlog_errno(status);
 345                         goto bail;
 346                 }
 347         }
 348
 349         dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
 350
 351         fi->ifi_stat[slot].lfi_total =
 352                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
 353         fi->ifi_stat[slot].lfi_free =
 354                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
 355                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
 356
 357 bail:
 358         if (unlock)
 359                 ocfs2_inode_unlock(inode_alloc, 0);
 360
 361         if (inode_alloc)
 362                 mutex_unlock(&inode_alloc->i_mutex);
 363
 364         brelse(bh);
 365
 366         return status;
 367 }
 368
 369 int ocfs2_info_handle_freeinode(struct inode *inode,
 370                                 struct ocfs2_info_request __user *req)
 371 {
 372         u32 i;
 373         u64 blkno = -1;
 374         char namebuf[40];
 375         int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
 376         struct ocfs2_info_freeinode *oifi = NULL;
 377         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 378         struct inode *inode_alloc = NULL;
 379
 380         oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
 381         if (!oifi) {
 382                 status = -ENOMEM;
 383                 mlog_errno(status);
 384                 goto out_err;
 385         }
 386
 387         if (o2info_from_user(*oifi, req))
 388                 goto bail;
 389
 390         oifi->ifi_slotnum = osb->max_slots;
 391
 392         for (i = 0; i < oifi->ifi_slotnum; i++) {
 393                 if (o2info_coherent(&oifi->ifi_req)) {
 394                         inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
 395                         if (!inode_alloc) {
 396                                 mlog(ML_ERROR, "unable to get alloc inode in "
 397                                     "slot %u\n", i);
 398                                 status = -EIO;
 399                                 goto bail;
 400                         }
 401                 } else {
 402                         ocfs2_sprintf_system_inode_name(namebuf,
 403                                                         sizeof(namebuf),
 404                                                         type, i);
 405                         status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 406                                                             namebuf,
 407                                                             strlen(namebuf),
 408                                                             &blkno);
 409                         if (status < 0) {
 410                                 status = -ENOENT;
 411                                 goto bail;
 412                         }
 413                 }
 414
 415                 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
 416
 417                 iput(inode_alloc);
 418                 inode_alloc = NULL;
 419
 420                 if (status < 0)
 421                         goto bail;
 422         }
 423
 424         o2info_set_request_filled(&oifi->ifi_req);
 425
 426         if (o2info_to_user(*oifi, req))
 427                 goto bail;
 428
 429         status = 0;
 430 bail:
 431         if (status)
 432                 o2info_set_request_error(&oifi->ifi_req, req);
 433
 434         kfree(oifi);
 435 out_err:
 436         return status;
 437 }
 438
 439 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 440                                    unsigned int chunksize)
 441 {
 442         int index;
 443
 444         index = __ilog2_u32(chunksize);
 445         if (index >= OCFS2_INFO_MAX_HIST)
 446                 index = OCFS2_INFO_MAX_HIST - 1;
 447
 448         hist->fc_chunks[index]++;
 449         hist->fc_clusters[index] += chunksize;
 450 }
 451
 452 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
 453                                unsigned int chunksize)
 454 {
 455         if (chunksize > stats->ffs_max)
 456                 stats->ffs_max = chunksize;
 457
 458         if (chunksize < stats->ffs_min)
 459                 stats->ffs_min = chunksize;
 460
 461         stats->ffs_avg += chunksize;
 462         stats->ffs_free_chunks_real++;
 463 }
 464
 465 void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
 466                            unsigned int chunksize)
 467 {
 468         o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
 469         o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
 470 }
 471
 472 int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
 473                                    struct inode *gb_inode,
 474                                    struct ocfs2_dinode *gb_dinode,
 475                                    struct ocfs2_chain_rec *rec,
 476                                    struct ocfs2_info_freefrag *ffg,
 477                                    u32 chunks_in_group)
 478 {
 479         int status = 0, used;
 480         u64 blkno;
 481
 482         struct buffer_head *bh = NULL;
 483         struct ocfs2_group_desc *bg = NULL;
 484
 485         unsigned int max_bits, num_clusters;
 486         unsigned int offset = 0, cluster, chunk;
 487         unsigned int chunk_free, last_chunksize = 0;
 488
 489         if (!le32_to_cpu(rec->c_free))
 490                 goto bail;
 491
 492         do {
 493                 if (!bg)
 494                         blkno = le64_to_cpu(rec->c_blkno);
 495                 else
 496                         blkno = le64_to_cpu(bg->bg_next_group);
 497
 498                 if (bh) {
 499                         brelse(bh);
 500                         bh = NULL;
 501                 }
 502
 503                 if (o2info_coherent(&ffg->iff_req))
 504                         status = ocfs2_read_group_descriptor(gb_inode,
 505                                                              gb_dinode,
 506                                                              blkno, &bh);
 507                 else
 508                         status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 509
 510                 if (status < 0) {
 511                         mlog(ML_ERROR, "Can't read the group descriptor # "
 512                              "%llu from device.", (unsigned long long)blkno);
 513                         status = -EIO;
 514                         goto bail;
 515                 }
 516
 517                 bg = (struct ocfs2_group_desc *)bh->b_data;
 518
 519                 if (!le16_to_cpu(bg->bg_free_bits_count))
 520                         continue;
 521
 522                 max_bits = le16_to_cpu(bg->bg_bits);
 523                 offset = 0;
 524
 525                 for (chunk = 0; chunk < chunks_in_group; chunk++) {
 526                         /*
 527                          * last chunk may be not an entire one.
 528                          */
 529                         if ((offset + ffg->iff_chunksize) > max_bits)
 530                                 num_clusters = max_bits - offset;
 531                         else
 532                                 num_clusters = ffg->iff_chunksize;
 533
 534                         chunk_free = 0;
 535                         for (cluster = 0; cluster < num_clusters; cluster++) {
 536                                 used = ocfs2_test_bit(offset,
 537                                                 (unsigned long *)bg->bg_bitmap);
 538                                 /*
 539                                  * - chunk_free counts free clusters in #N chunk.
 540                                  * - last_chunksize records the size(in) clusters
 541                                  *   for the last real free chunk being counted.
 542                                  */
 543                                 if (!used) {
 544                                         last_chunksize++;
 545                                         chunk_free++;
 546                                 }
 547
 548                                 if (used && last_chunksize) {
 549                                         ocfs2_info_update_ffg(ffg,
 550                                                               last_chunksize);
 551                                         last_chunksize = 0;
 552                                 }
 553
 554                                 offset++;
 555                         }
 556
 557                         if (chunk_free == ffg->iff_chunksize)
 558                                 ffg->iff_ffs.ffs_free_chunks++;
 559                 }
 560
 561                 /*
 562                  * need to update the info for last free chunk.
 563                  */
 564                 if (last_chunksize)
 565                         ocfs2_info_update_ffg(ffg, last_chunksize);
 566
 567         } while (le64_to_cpu(bg->bg_next_group));
 568
 569 bail:
 570         brelse(bh);
 571
 572         return status;
 573 }
 574
 575 int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
 576                                     struct inode *gb_inode, u64 blkno,
 577                                     struct ocfs2_info_freefrag *ffg)
 578 {
 579         u32 chunks_in_group;
 580         int status = 0, unlock = 0, i;
 581
 582         struct buffer_head *bh = NULL;
 583         struct ocfs2_chain_list *cl = NULL;
 584         struct ocfs2_chain_rec *rec = NULL;
 585         struct ocfs2_dinode *gb_dinode = NULL;
 586
 587         if (gb_inode)
 588                 mutex_lock(&gb_inode->i_mutex);
 589
 590         if (o2info_coherent(&ffg->iff_req)) {
 591                 status = ocfs2_inode_lock(gb_inode, &bh, 0);
 592                 if (status < 0) {
 593                         mlog_errno(status);
 594                         goto bail;
 595                 }
 596                 unlock = 1;
 597         } else {
 598                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 599                 if (status < 0) {
 600                         mlog_errno(status);
 601                         goto bail;
 602                 }
 603         }
 604
 605         gb_dinode = (struct ocfs2_dinode *)bh->b_data;
 606         cl = &(gb_dinode->id2.i_chain);
 607
 608         /*
 609          * Chunksize(in) clusters from userspace should be
 610          * less than clusters in a group.
 611          */
 612         if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
 613                 status = -EINVAL;
 614                 goto bail;
 615         }
 616
 617         memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
 618
 619         ffg->iff_ffs.ffs_min = ~0U;
 620         ffg->iff_ffs.ffs_clusters =
 621                         le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
 622         ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
 623                         le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
 624
 625         chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
 626
 627         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 628                 rec = &(cl->cl_recs[i]);
 629                 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
 630                                                         gb_dinode,
 631                                                         rec, ffg,
 632                                                         chunks_in_group);
 633                 if (status)
 634                         goto bail;
 635         }
 636
 637         if (ffg->iff_ffs.ffs_free_chunks_real)
 638                 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
 639                                         ffg->iff_ffs.ffs_free_chunks_real);
 640 bail:
 641         if (unlock)
 642                 ocfs2_inode_unlock(gb_inode, 0);
 643
 644         if (gb_inode)
 645                 mutex_unlock(&gb_inode->i_mutex);
 646
 647         if (gb_inode)
 648                 iput(gb_inode);
 649
 650         brelse(bh);
 651
 652         return status;
 653 }
 654
 655 int ocfs2_info_handle_freefrag(struct inode *inode,
 656                                struct ocfs2_info_request __user *req)
 657 {
 658         u64 blkno = -1;
 659         char namebuf[40];
 660         int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
 661
 662         struct ocfs2_info_freefrag *oiff;
 663         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 664         struct inode *gb_inode = NULL;
 665
 666         oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
 667         if (!oiff) {
 668                 status = -ENOMEM;
 669                 mlog_errno(status);
 670                 goto out_err;
 671         }
 672
 673         if (o2info_from_user(*oiff, req))
 674                 goto bail;
 675         /*
 676          * chunksize from userspace should be power of 2.
 677          */
 678         if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
 679             (!oiff->iff_chunksize)) {
 680                 status = -EINVAL;
 681                 goto bail;
 682         }
 683
 684         if (o2info_coherent(&oiff->iff_req)) {
 685                 gb_inode = ocfs2_get_system_file_inode(osb, type,
 686                                                        OCFS2_INVALID_SLOT);
 687                 if (!gb_inode) {
 688                         mlog(ML_ERROR, "unable to get global_bitmap inode\n");
 689                         status = -EIO;
 690                         goto bail;
 691                 }
 692         } else {
 693                 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
 694                                                 OCFS2_INVALID_SLOT);
 695                 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 696                                                     namebuf,
 697                                                     strlen(namebuf),
 698                                                     &blkno);
 699                 if (status < 0) {
 700                         status = -ENOENT;
 701                         goto bail;
 702                 }
 703         }
 704
 705         status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
 706         if (status < 0)
 707                 goto bail;
 708
 709         o2info_set_request_filled(&oiff->iff_req);
 710
 711         if (o2info_to_user(*oiff, req)) {
 712                 status = -EFAULT;
 713                 goto bail;
 714         }
 715
 716         status = 0;
 717 bail:
 718         if (status)
 719                 o2info_set_request_error(&oiff->iff_req, req);
 720
 721         kfree(oiff);
 722 out_err:
 723         return status;
 724 }
 725
 726 int ocfs2_info_handle_unknown(struct inode *inode,
 727                               struct ocfs2_info_request __user *req)
 728 {
 729         int status = -EFAULT;
 730         struct ocfs2_info_request oir;
 731
 732         if (o2info_from_user(oir, req))
 733                 goto bail;
 734
 735         o2info_clear_request_filled(&oir);
 736
 737         if (o2info_to_user(oir, req))
 738                 goto bail;
 739
 740         status = 0;
 741 bail:
 742         if (status)
 743                 o2info_set_request_error(&oir, req);
 744
 745         return status;
 746 }
 747
 748 /*
 749  * Validate and distinguish OCFS2_IOC_INFO requests.
 750  *
 751  * - validate the magic number.
 752  * - distinguish different requests.
 753  * - validate size of different requests.
 754  */
 755 int ocfs2_info_handle_request(struct inode *inode,
 756                               struct ocfs2_info_request __user *req)
 757 {
 758         int status = -EFAULT;
 759         struct ocfs2_info_request oir;
 760
 761         if (o2info_from_user(oir, req))
 762                 goto bail;
 763
 764         status = -EINVAL;
 765         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 766                 goto bail;
 767
 768         switch (oir.ir_code) {
 769         case OCFS2_INFO_BLOCKSIZE:
 770                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 771                         status = ocfs2_info_handle_blocksize(inode, req);
 772                 break;
 773         case OCFS2_INFO_CLUSTERSIZE:
 774                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 775                         status = ocfs2_info_handle_clustersize(inode, req);
 776                 break;
 777         case OCFS2_INFO_MAXSLOTS:
 778                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 779                         status = ocfs2_info_handle_maxslots(inode, req);
 780                 break;
 781         case OCFS2_INFO_LABEL:
 782                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 783                         status = ocfs2_info_handle_label(inode, req);
 784                 break;
 785         case OCFS2_INFO_UUID:
 786                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 787                         status = ocfs2_info_handle_uuid(inode, req);
 788                 break;
 789         case OCFS2_INFO_FS_FEATURES:
 790                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 791                         status = ocfs2_info_handle_fs_features(inode, req);
 792                 break;
 793         case OCFS2_INFO_JOURNAL_SIZE:
 794                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 795                         status = ocfs2_info_handle_journal_size(inode, req);
 796                 break;
 797         case OCFS2_INFO_FREEINODE:
 798                 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
 799                         status = ocfs2_info_handle_freeinode(inode, req);
 800                 break;
 801         case OCFS2_INFO_FREEFRAG:
 802                 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
 803                         status = ocfs2_info_handle_freefrag(inode, req);
 804                 break;
 805         default:
 806                 status = ocfs2_info_handle_unknown(inode, req);
 807                 break;
 808         }
 809
 810 bail:
 811         return status;
 812 }
 813
 814 int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 815                           u64 *req_addr, int compat_flag)
 816 {
 817         int status = -EFAULT;
 818         u64 __user *bp = NULL;
 819
 820         if (compat_flag) {
 821 #ifdef CONFIG_COMPAT
 822                 /*
 823                  * pointer bp stores the base address of a pointers array,
 824                  * which collects all addresses of separate request.
 825                  */
 826                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 827 #else
 828                 BUG();
 829 #endif
 830         } else
 831                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 832
 833         if (o2info_from_user(*req_addr, bp + idx))
 834                 goto bail;
 835
 836         status = 0;
 837 bail:
 838         return status;
 839 }
 840
 841 /*
 842  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 843  *
 844  * ocfs2_info_handle() recevies a large info aggregation, grab and
 845  * validate the request count from header, then break it into small
 846  * pieces, later specific handlers can handle them one by one.
 847  *
 848  * Idea here is to make each separate request small enough to ensure
 849  * a better backward&forward compatibility, since a small piece of
 850  * request will be less likely to be broken if disk layout get changed.
 851  */
 852 int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
 853                       int compat_flag)
 854 {
 855         int i, status = 0;
 856         u64 req_addr;
 857         struct ocfs2_info_request __user *reqp;
 858
 859         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 860             (!info->oi_requests)) {
 861                 status = -EINVAL;
 862                 goto bail;
 863         }
 864
 865         for (i = 0; i < info->oi_count; i++) {
 866
 867                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 868                 if (status)
 869                         break;
 870
 871                 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
 872                 if (!reqp) {
 873                         status = -EINVAL;
 874                         goto bail;
 875                 }
 876
 877                 status = ocfs2_info_handle_request(inode, reqp);
 878                 if (status)
 879                         break;
 880         }
 881
 882 bail:
 883         return status;
 884 }
 885
 886 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 887 {
 888         struct inode *inode = file_inode(filp);
 889         unsigned int flags;
 890         int new_clusters;
 891         int status;
 892         struct ocfs2_space_resv sr;
 893         struct ocfs2_new_group_input input;
 894         struct reflink_arguments args;
 895         const char __user *old_path;
 896         const char __user *new_path;
 897         bool preserve;
 898         struct ocfs2_info info;
 899         void __user *argp = (void __user *)arg;
 900
 901         switch (cmd) {
 902         case OCFS2_IOC_GETFLAGS:
 903                 status = ocfs2_get_inode_attr(inode, &flags);
 904                 if (status < 0)
 905                         return status;
 906
 907                 flags &= OCFS2_FL_VISIBLE;
 908                 return put_user(flags, (int __user *) arg);
 909         case OCFS2_IOC_SETFLAGS:
 910                 if (get_user(flags, (int __user *) arg))
 911                         return -EFAULT;
 912
 913                 status = mnt_want_write_file(filp);
 914                 if (status)
 915                         return status;
 916                 status = ocfs2_set_inode_attr(inode, flags,
 917                         OCFS2_FL_MODIFIABLE);
 918                 mnt_drop_write_file(filp);
 919                 return status;
 920         case OCFS2_IOC_RESVSP:
 921         case OCFS2_IOC_RESVSP64:
 922         case OCFS2_IOC_UNRESVSP:
 923         case OCFS2_IOC_UNRESVSP64:
 924                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 925                         return -EFAULT;
 926
 927                 return ocfs2_change_file_space(filp, cmd, &sr);
 928         case OCFS2_IOC_GROUP_EXTEND:
 929                 if (!capable(CAP_SYS_RESOURCE))
 930                         return -EPERM;
 931
 932                 if (get_user(new_clusters, (int __user *)arg))
 933                         return -EFAULT;
 934
 935                 status = mnt_want_write_file(filp);
 936                 if (status)
 937                         return status;
 938                 status = ocfs2_group_extend(inode, new_clusters);
 939                 mnt_drop_write_file(filp);
 940                 return status;
 941         case OCFS2_IOC_GROUP_ADD:
 942         case OCFS2_IOC_GROUP_ADD64:
 943                 if (!capable(CAP_SYS_RESOURCE))
 944                         return -EPERM;
 945
 946                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 947                         return -EFAULT;
 948
 949                 status = mnt_want_write_file(filp);
 950                 if (status)
 951                         return status;
 952                 status = ocfs2_group_add(inode, &input);
 953                 mnt_drop_write_file(filp);
 954                 return status;
 955         case OCFS2_IOC_REFLINK:
 956                 if (copy_from_user(&args, argp, sizeof(args)))
 957                         return -EFAULT;
 958                 old_path = (const char __user *)(unsigned long)args.old_path;
 959                 new_path = (const char __user *)(unsigned long)args.new_path;
 960                 preserve = (args.preserve != 0);
 961
 962                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 963         case OCFS2_IOC_INFO:
 964                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 965                         return -EFAULT;
 966
 967                 return ocfs2_info_handle(inode, &info, 0);
 968         case FITRIM:
 969         {
 970                 struct super_block *sb = inode->i_sb;
 971                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 972                 struct fstrim_range range;
 973                 int ret = 0;
 974
 975                 if (!capable(CAP_SYS_ADMIN))
 976                         return -EPERM;
 977
 978                 if (!blk_queue_discard(q))
 979                         return -EOPNOTSUPP;
 980
 981                 if (copy_from_user(&range, argp, sizeof(range)))
 982                         return -EFAULT;
 983
 984                 range.minlen = max_t(u64, q->limits.discard_granularity,
 985                                      range.minlen);
 986                 ret = ocfs2_trim_fs(sb, &range);
 987                 if (ret < 0)
 988                         return ret;
 989
 990                 if (copy_to_user(argp, &range, sizeof(range)))
 991                         return -EFAULT;
 992
 993                 return 0;
 994         }
 995         case OCFS2_IOC_MOVE_EXT:
 996                 return ocfs2_ioctl_move_extents(filp, argp);
 997         default:
 998                 return -ENOTTY;
 999         }
1000 }
1001
1002 #ifdef CONFIG_COMPAT
1003 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1004 {
1005         bool preserve;
1006         struct reflink_arguments args;
1007         struct inode *inode = file_inode(file);
1008         struct ocfs2_info info;
1009         void __user *argp = (void __user *)arg;
1010
1011         switch (cmd) {
1012         case OCFS2_IOC32_GETFLAGS:
1013                 cmd = OCFS2_IOC_GETFLAGS;
1014                 break;
1015         case OCFS2_IOC32_SETFLAGS:
1016                 cmd = OCFS2_IOC_SETFLAGS;
1017                 break;
1018         case OCFS2_IOC_RESVSP:
1019         case OCFS2_IOC_RESVSP64:
1020         case OCFS2_IOC_UNRESVSP:
1021         case OCFS2_IOC_UNRESVSP64:
1022         case OCFS2_IOC_GROUP_EXTEND:
1023         case OCFS2_IOC_GROUP_ADD:
1024         case OCFS2_IOC_GROUP_ADD64:
1025         case FITRIM:
1026                 break;
1027         case OCFS2_IOC_REFLINK:
1028                 if (copy_from_user(&args, argp, sizeof(args)))
1029                         return -EFAULT;
1030                 preserve = (args.preserve != 0);
1031
1032                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1033                                            compat_ptr(args.new_path), preserve);
1034         case OCFS2_IOC_INFO:
1035                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
1036                         return -EFAULT;
1037
1038                 return ocfs2_info_handle(inode, &info, 1);
1039         case OCFS2_IOC_MOVE_EXT:
1040                 break;
1041         default:
1042                 return -ENOIOCTLCMD;
1043         }
1044
1045         return ocfs2_ioctl(file, cmd, arg);
1046 }
1047 #endif