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/compat.h>
  11
  12 #include <cluster/masklog.h>
  13
  14 #include "ocfs2.h"
  15 #include "alloc.h"
  16 #include "dlmglue.h"
  17 #include "file.h"
  18 #include "inode.h"
  19 #include "journal.h"
  20
  21 #include "ocfs2_fs.h"
  22 #include "ioctl.h"
  23 #include "resize.h"
  24 #include "refcounttree.h"
  25 #include "sysfile.h"
  26 #include "dir.h"
  27 #include "buffer_head_io.h"
  28 #include "suballoc.h"
  29 #include "move_extents.h"
  30
  31 #include <linux/ext2_fs.h>
  32
  33 #define o2info_from_user(a, b)  \
  34                 copy_from_user(&(a), (b), sizeof(a))
  35 #define o2info_to_user(a, b)    \
  36                 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
  37
  38 /*
  39  * This call is void because we are already reporting an error that may
  40  * be -EFAULT.  The error will be returned from the ioctl(2) call.  It's
  41  * just a best-effort to tell userspace that this request 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 static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
  66 {
  67         int status;
  68
  69         status = ocfs2_inode_lock(inode, NULL, 0);
  70         if (status < 0) {
  71                 mlog_errno(status);
  72                 return status;
  73         }
  74         ocfs2_get_inode_flags(OCFS2_I(inode));
  75         *flags = OCFS2_I(inode)->ip_attr;
  76         ocfs2_inode_unlock(inode, 0);
  77
  78         return status;
  79 }
  80
  81 static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
  82                                 unsigned mask)
  83 {
  84         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  85         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  86         handle_t *handle = NULL;
  87         struct buffer_head *bh = NULL;
  88         unsigned oldflags;
  89         int status;
  90
  91         mutex_lock(&inode->i_mutex);
  92
  93         status = ocfs2_inode_lock(inode, &bh, 1);
  94         if (status < 0) {
  95                 mlog_errno(status);
  96                 goto bail;
  97         }
  98
  99         status = -EACCES;
 100         if (!inode_owner_or_capable(inode))
 101                 goto bail_unlock;
 102
 103         if (!S_ISDIR(inode->i_mode))
 104                 flags &= ~OCFS2_DIRSYNC_FL;
 105
 106         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 107         if (IS_ERR(handle)) {
 108                 status = PTR_ERR(handle);
 109                 mlog_errno(status);
 110                 goto bail_unlock;
 111         }
 112
 113         oldflags = ocfs2_inode->ip_attr;
 114         flags = flags & mask;
 115         flags |= oldflags & ~mask;
 116
 117         /*
 118          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 119          * the relevant capability.
 120          */
 121         status = -EPERM;
 122         if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
 123                 (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
 124                 if (!capable(CAP_LINUX_IMMUTABLE))
 125                         goto bail_unlock;
 126         }
 127
 128         ocfs2_inode->ip_attr = flags;
 129         ocfs2_set_inode_flags(inode);
 130
 131         status = ocfs2_mark_inode_dirty(handle, inode, bh);
 132         if (status < 0)
 133                 mlog_errno(status);
 134
 135         ocfs2_commit_trans(osb, handle);
 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 = osb->journal->j_inode->i_size;
 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 bail;
 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                 if (status < 0)
 417                         goto bail;
 418
 419                 iput(inode_alloc);
 420                 inode_alloc = NULL;
 421         }
 422
 423         o2info_set_request_filled(&oifi->ifi_req);
 424
 425         if (o2info_to_user(*oifi, req))
 426                 goto bail;
 427
 428         status = 0;
 429 bail:
 430         if (status)
 431                 o2info_set_request_error(&oifi->ifi_req, req);
 432
 433         kfree(oifi);
 434
 435         return status;
 436 }
 437
 438 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 439                                    unsigned int chunksize)
 440 {
 441         int index;
 442
 443         index = __ilog2_u32(chunksize);
 444         if (index >= OCFS2_INFO_MAX_HIST)
 445                 index = OCFS2_INFO_MAX_HIST - 1;
 446
 447         hist->fc_chunks[index]++;
 448         hist->fc_clusters[index] += chunksize;
 449 }
 450
 451 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
 452                                unsigned int chunksize)
 453 {
 454         if (chunksize > stats->ffs_max)
 455                 stats->ffs_max = chunksize;
 456
 457         if (chunksize < stats->ffs_min)
 458                 stats->ffs_min = chunksize;
 459
 460         stats->ffs_avg += chunksize;
 461         stats->ffs_free_chunks_real++;
 462 }
 463
 464 void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
 465                            unsigned int chunksize)
 466 {
 467         o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
 468         o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
 469 }
 470
 471 int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
 472                                    struct inode *gb_inode,
 473                                    struct ocfs2_dinode *gb_dinode,
 474                                    struct ocfs2_chain_rec *rec,
 475                                    struct ocfs2_info_freefrag *ffg,
 476                                    u32 chunks_in_group)
 477 {
 478         int status = 0, used;
 479         u64 blkno;
 480
 481         struct buffer_head *bh = NULL;
 482         struct ocfs2_group_desc *bg = NULL;
 483
 484         unsigned int max_bits, num_clusters;
 485         unsigned int offset = 0, cluster, chunk;
 486         unsigned int chunk_free, last_chunksize = 0;
 487
 488         if (!le32_to_cpu(rec->c_free))
 489                 goto bail;
 490
 491         do {
 492                 if (!bg)
 493                         blkno = le64_to_cpu(rec->c_blkno);
 494                 else
 495                         blkno = le64_to_cpu(bg->bg_next_group);
 496
 497                 if (bh) {
 498                         brelse(bh);
 499                         bh = NULL;
 500                 }
 501
 502                 if (o2info_coherent(&ffg->iff_req))
 503                         status = ocfs2_read_group_descriptor(gb_inode,
 504                                                              gb_dinode,
 505                                                              blkno, &bh);
 506                 else
 507                         status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 508
 509                 if (status < 0) {
 510                         mlog(ML_ERROR, "Can't read the group descriptor # "
 511                              "%llu from device.", (unsigned long long)blkno);
 512                         status = -EIO;
 513                         goto bail;
 514                 }
 515
 516                 bg = (struct ocfs2_group_desc *)bh->b_data;
 517
 518                 if (!le16_to_cpu(bg->bg_free_bits_count))
 519                         continue;
 520
 521                 max_bits = le16_to_cpu(bg->bg_bits);
 522                 offset = 0;
 523
 524                 for (chunk = 0; chunk < chunks_in_group; chunk++) {
 525                         /*
 526                          * last chunk may be not an entire one.
 527                          */
 528                         if ((offset + ffg->iff_chunksize) > max_bits)
 529                                 num_clusters = max_bits - offset;
 530                         else
 531                                 num_clusters = ffg->iff_chunksize;
 532
 533                         chunk_free = 0;
 534                         for (cluster = 0; cluster < num_clusters; cluster++) {
 535                                 used = ocfs2_test_bit(offset,
 536                                                 (unsigned long *)bg->bg_bitmap);
 537                                 /*
 538                                  * - chunk_free counts free clusters in #N chunk.
 539                                  * - last_chunksize records the size(in) clusters
 540                                  *   for the last real free chunk being counted.
 541                                  */
 542                                 if (!used) {
 543                                         last_chunksize++;
 544                                         chunk_free++;
 545                                 }
 546
 547                                 if (used && last_chunksize) {
 548                                         ocfs2_info_update_ffg(ffg,
 549                                                               last_chunksize);
 550                                         last_chunksize = 0;
 551                                 }
 552
 553                                 offset++;
 554                         }
 555
 556                         if (chunk_free == ffg->iff_chunksize)
 557                                 ffg->iff_ffs.ffs_free_chunks++;
 558                 }
 559
 560                 /*
 561                  * need to update the info for last free chunk.
 562                  */
 563                 if (last_chunksize)
 564                         ocfs2_info_update_ffg(ffg, last_chunksize);
 565
 566         } while (le64_to_cpu(bg->bg_next_group));
 567
 568 bail:
 569         brelse(bh);
 570
 571         return status;
 572 }
 573
 574 int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
 575                                     struct inode *gb_inode, u64 blkno,
 576                                     struct ocfs2_info_freefrag *ffg)
 577 {
 578         u32 chunks_in_group;
 579         int status = 0, unlock = 0, i;
 580
 581         struct buffer_head *bh = NULL;
 582         struct ocfs2_chain_list *cl = NULL;
 583         struct ocfs2_chain_rec *rec = NULL;
 584         struct ocfs2_dinode *gb_dinode = NULL;
 585
 586         if (gb_inode)
 587                 mutex_lock(&gb_inode->i_mutex);
 588
 589         if (o2info_coherent(&ffg->iff_req)) {
 590                 status = ocfs2_inode_lock(gb_inode, &bh, 0);
 591                 if (status < 0) {
 592                         mlog_errno(status);
 593                         goto bail;
 594                 }
 595                 unlock = 1;
 596         } else {
 597                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 598                 if (status < 0) {
 599                         mlog_errno(status);
 600                         goto bail;
 601                 }
 602         }
 603
 604         gb_dinode = (struct ocfs2_dinode *)bh->b_data;
 605         cl = &(gb_dinode->id2.i_chain);
 606
 607         /*
 608          * Chunksize(in) clusters from userspace should be
 609          * less than clusters in a group.
 610          */
 611         if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
 612                 status = -EINVAL;
 613                 goto bail;
 614         }
 615
 616         memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
 617
 618         ffg->iff_ffs.ffs_min = ~0U;
 619         ffg->iff_ffs.ffs_clusters =
 620                         le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
 621         ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
 622                         le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
 623
 624         chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
 625
 626         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 627                 rec = &(cl->cl_recs[i]);
 628                 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
 629                                                         gb_dinode,
 630                                                         rec, ffg,
 631                                                         chunks_in_group);
 632                 if (status)
 633                         goto bail;
 634         }
 635
 636         if (ffg->iff_ffs.ffs_free_chunks_real)
 637                 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
 638                                         ffg->iff_ffs.ffs_free_chunks_real);
 639 bail:
 640         if (unlock)
 641                 ocfs2_inode_unlock(gb_inode, 0);
 642
 643         if (gb_inode)
 644                 mutex_unlock(&gb_inode->i_mutex);
 645
 646         if (gb_inode)
 647                 iput(gb_inode);
 648
 649         brelse(bh);
 650
 651         return status;
 652 }
 653
 654 int ocfs2_info_handle_freefrag(struct inode *inode,
 655                                struct ocfs2_info_request __user *req)
 656 {
 657         u64 blkno = -1;
 658         char namebuf[40];
 659         int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
 660
 661         struct ocfs2_info_freefrag *oiff;
 662         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 663         struct inode *gb_inode = NULL;
 664
 665         oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
 666         if (!oiff) {
 667                 status = -ENOMEM;
 668                 mlog_errno(status);
 669                 goto bail;
 670         }
 671
 672         if (o2info_from_user(*oiff, req))
 673                 goto bail;
 674         /*
 675          * chunksize from userspace should be power of 2.
 676          */
 677         if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
 678             (!oiff->iff_chunksize)) {
 679                 status = -EINVAL;
 680                 goto bail;
 681         }
 682
 683         if (o2info_coherent(&oiff->iff_req)) {
 684                 gb_inode = ocfs2_get_system_file_inode(osb, type,
 685                                                        OCFS2_INVALID_SLOT);
 686                 if (!gb_inode) {
 687                         mlog(ML_ERROR, "unable to get global_bitmap inode\n");
 688                         status = -EIO;
 689                         goto bail;
 690                 }
 691         } else {
 692                 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
 693                                                 OCFS2_INVALID_SLOT);
 694                 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 695                                                     namebuf,
 696                                                     strlen(namebuf),
 697                                                     &blkno);
 698                 if (status < 0) {
 699                         status = -ENOENT;
 700                         goto bail;
 701                 }
 702         }
 703
 704         status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
 705         if (status < 0)
 706                 goto bail;
 707
 708         o2info_set_request_filled(&oiff->iff_req);
 709
 710         if (o2info_to_user(*oiff, req))
 711                 goto bail;
 712
 713         status = 0;
 714 bail:
 715         if (status)
 716                 o2info_set_request_error(&oiff->iff_req, req);
 717
 718         kfree(oiff);
 719
 720         return status;
 721 }
 722
 723 int ocfs2_info_handle_unknown(struct inode *inode,
 724                               struct ocfs2_info_request __user *req)
 725 {
 726         int status = -EFAULT;
 727         struct ocfs2_info_request oir;
 728
 729         if (o2info_from_user(oir, req))
 730                 goto bail;
 731
 732         o2info_clear_request_filled(&oir);
 733
 734         if (o2info_to_user(oir, req))
 735                 goto bail;
 736
 737         status = 0;
 738 bail:
 739         if (status)
 740                 o2info_set_request_error(&oir, req);
 741
 742         return status;
 743 }
 744
 745 /*
 746  * Validate and distinguish OCFS2_IOC_INFO requests.
 747  *
 748  * - validate the magic number.
 749  * - distinguish different requests.
 750  * - validate size of different requests.
 751  */
 752 int ocfs2_info_handle_request(struct inode *inode,
 753                               struct ocfs2_info_request __user *req)
 754 {
 755         int status = -EFAULT;
 756         struct ocfs2_info_request oir;
 757
 758         if (o2info_from_user(oir, req))
 759                 goto bail;
 760
 761         status = -EINVAL;
 762         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 763                 goto bail;
 764
 765         switch (oir.ir_code) {
 766         case OCFS2_INFO_BLOCKSIZE:
 767                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 768                         status = ocfs2_info_handle_blocksize(inode, req);
 769                 break;
 770         case OCFS2_INFO_CLUSTERSIZE:
 771                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 772                         status = ocfs2_info_handle_clustersize(inode, req);
 773                 break;
 774         case OCFS2_INFO_MAXSLOTS:
 775                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 776                         status = ocfs2_info_handle_maxslots(inode, req);
 777                 break;
 778         case OCFS2_INFO_LABEL:
 779                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 780                         status = ocfs2_info_handle_label(inode, req);
 781                 break;
 782         case OCFS2_INFO_UUID:
 783                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 784                         status = ocfs2_info_handle_uuid(inode, req);
 785                 break;
 786         case OCFS2_INFO_FS_FEATURES:
 787                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 788                         status = ocfs2_info_handle_fs_features(inode, req);
 789                 break;
 790         case OCFS2_INFO_JOURNAL_SIZE:
 791                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 792                         status = ocfs2_info_handle_journal_size(inode, req);
 793                 break;
 794         case OCFS2_INFO_FREEINODE:
 795                 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
 796                         status = ocfs2_info_handle_freeinode(inode, req);
 797                 break;
 798         case OCFS2_INFO_FREEFRAG:
 799                 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
 800                         status = ocfs2_info_handle_freefrag(inode, req);
 801                 break;
 802         default:
 803                 status = ocfs2_info_handle_unknown(inode, req);
 804                 break;
 805         }
 806
 807 bail:
 808         return status;
 809 }
 810
 811 int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 812                           u64 *req_addr, int compat_flag)
 813 {
 814         int status = -EFAULT;
 815         u64 __user *bp = NULL;
 816
 817         if (compat_flag) {
 818 #ifdef CONFIG_COMPAT
 819                 /*
 820                  * pointer bp stores the base address of a pointers array,
 821                  * which collects all addresses of separate request.
 822                  */
 823                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 824 #else
 825                 BUG();
 826 #endif
 827         } else
 828                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 829
 830         if (o2info_from_user(*req_addr, bp + idx))
 831                 goto bail;
 832
 833         status = 0;
 834 bail:
 835         return status;
 836 }
 837
 838 /*
 839  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 840  *
 841  * ocfs2_info_handle() recevies a large info aggregation, grab and
 842  * validate the request count from header, then break it into small
 843  * pieces, later specific handlers can handle them one by one.
 844  *
 845  * Idea here is to make each separate request small enough to ensure
 846  * a better backward&forward compatibility, since a small piece of
 847  * request will be less likely to be broken if disk layout get changed.
 848  */
 849 int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
 850                       int compat_flag)
 851 {
 852         int i, status = 0;
 853         u64 req_addr;
 854         struct ocfs2_info_request __user *reqp;
 855
 856         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 857             (!info->oi_requests)) {
 858                 status = -EINVAL;
 859                 goto bail;
 860         }
 861
 862         for (i = 0; i < info->oi_count; i++) {
 863
 864                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 865                 if (status)
 866                         break;
 867
 868                 reqp = (struct ocfs2_info_request *)(unsigned long)req_addr;
 869                 if (!reqp) {
 870                         status = -EINVAL;
 871                         goto bail;
 872                 }
 873
 874                 status = ocfs2_info_handle_request(inode, reqp);
 875                 if (status)
 876                         break;
 877         }
 878
 879 bail:
 880         return status;
 881 }
 882
 883 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 884 {
 885         struct inode *inode = filp->f_path.dentry->d_inode;
 886         unsigned int flags;
 887         int new_clusters;
 888         int status;
 889         struct ocfs2_space_resv sr;
 890         struct ocfs2_new_group_input input;
 891         struct reflink_arguments args;
 892         const char *old_path, *new_path;
 893         bool preserve;
 894         struct ocfs2_info info;
 895
 896         switch (cmd) {
 897         case OCFS2_IOC_GETFLAGS:
 898                 status = ocfs2_get_inode_attr(inode, &flags);
 899                 if (status < 0)
 900                         return status;
 901
 902                 flags &= OCFS2_FL_VISIBLE;
 903                 return put_user(flags, (int __user *) arg);
 904         case OCFS2_IOC_SETFLAGS:
 905                 if (get_user(flags, (int __user *) arg))
 906                         return -EFAULT;
 907
 908                 status = mnt_want_write(filp->f_path.mnt);
 909                 if (status)
 910                         return status;
 911                 status = ocfs2_set_inode_attr(inode, flags,
 912                         OCFS2_FL_MODIFIABLE);
 913                 mnt_drop_write(filp->f_path.mnt);
 914                 return status;
 915         case OCFS2_IOC_RESVSP:
 916         case OCFS2_IOC_RESVSP64:
 917         case OCFS2_IOC_UNRESVSP:
 918         case OCFS2_IOC_UNRESVSP64:
 919                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 920                         return -EFAULT;
 921
 922                 return ocfs2_change_file_space(filp, cmd, &sr);
 923         case OCFS2_IOC_GROUP_EXTEND:
 924                 if (!capable(CAP_SYS_RESOURCE))
 925                         return -EPERM;
 926
 927                 if (get_user(new_clusters, (int __user *)arg))
 928                         return -EFAULT;
 929
 930                 return ocfs2_group_extend(inode, new_clusters);
 931         case OCFS2_IOC_GROUP_ADD:
 932         case OCFS2_IOC_GROUP_ADD64:
 933                 if (!capable(CAP_SYS_RESOURCE))
 934                         return -EPERM;
 935
 936                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 937                         return -EFAULT;
 938
 939                 return ocfs2_group_add(inode, &input);
 940         case OCFS2_IOC_REFLINK:
 941                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 942                                    sizeof(args)))
 943                         return -EFAULT;
 944                 old_path = (const char *)(unsigned long)args.old_path;
 945                 new_path = (const char *)(unsigned long)args.new_path;
 946                 preserve = (args.preserve != 0);
 947
 948                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 949         case OCFS2_IOC_INFO:
 950                 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
 951                                    sizeof(struct ocfs2_info)))
 952                         return -EFAULT;
 953
 954                 return ocfs2_info_handle(inode, &info, 0);
 955         case OCFS2_IOC_MOVE_EXT:
 956                 return ocfs2_ioctl_move_extents(filp, (void __user *)arg);
 957         default:
 958                 return -ENOTTY;
 959         }
 960 }
 961
 962 #ifdef CONFIG_COMPAT
 963 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 964 {
 965         bool preserve;
 966         struct reflink_arguments args;
 967         struct inode *inode = file->f_path.dentry->d_inode;
 968         struct ocfs2_info info;
 969
 970         switch (cmd) {
 971         case OCFS2_IOC32_GETFLAGS:
 972                 cmd = OCFS2_IOC_GETFLAGS;
 973                 break;
 974         case OCFS2_IOC32_SETFLAGS:
 975                 cmd = OCFS2_IOC_SETFLAGS;
 976                 break;
 977         case OCFS2_IOC_RESVSP:
 978         case OCFS2_IOC_RESVSP64:
 979         case OCFS2_IOC_UNRESVSP:
 980         case OCFS2_IOC_UNRESVSP64:
 981         case OCFS2_IOC_GROUP_EXTEND:
 982         case OCFS2_IOC_GROUP_ADD:
 983         case OCFS2_IOC_GROUP_ADD64:
 984                 break;
 985         case OCFS2_IOC_REFLINK:
 986                 if (copy_from_user(&args, (struct reflink_arguments *)arg,
 987                                    sizeof(args)))
 988                         return -EFAULT;
 989                 preserve = (args.preserve != 0);
 990
 991                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
 992                                            compat_ptr(args.new_path), preserve);
 993         case OCFS2_IOC_INFO:
 994                 if (copy_from_user(&info, (struct ocfs2_info __user *)arg,
 995                                    sizeof(struct ocfs2_info)))
 996                         return -EFAULT;
 997
 998                 return ocfs2_info_handle(inode, &info, 1);
 999         case OCFS2_IOC_MOVE_EXT:
1000                 break;
1001         default:
1002                 return -ENOIOCTLCMD;
1003         }
1004
1005         return ocfs2_ioctl(file, cmd, arg);
1006 }
1007 #endif