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 static 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 static 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 static 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 static 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 static 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 static 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 static 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 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
 323                                        struct inode *inode_alloc, u64 blkno,
 324                                        struct ocfs2_info_freeinode *fi,
 325                                        u32 slot)
 326 {
 327         int status = 0, unlock = 0;
 328
 329         struct buffer_head *bh = NULL;
 330         struct ocfs2_dinode *dinode_alloc = NULL;
 331
 332         if (inode_alloc)
 333                 mutex_lock(&inode_alloc->i_mutex);
 334
 335         if (o2info_coherent(&fi->ifi_req)) {
 336                 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
 337                 if (status < 0) {
 338                         mlog_errno(status);
 339                         goto bail;
 340                 }
 341                 unlock = 1;
 342         } else {
 343                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 344                 if (status < 0) {
 345                         mlog_errno(status);
 346                         goto bail;
 347                 }
 348         }
 349
 350         dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
 351
 352         fi->ifi_stat[slot].lfi_total =
 353                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
 354         fi->ifi_stat[slot].lfi_free =
 355                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
 356                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
 357
 358 bail:
 359         if (unlock)
 360                 ocfs2_inode_unlock(inode_alloc, 0);
 361
 362         if (inode_alloc)
 363                 mutex_unlock(&inode_alloc->i_mutex);
 364
 365         brelse(bh);
 366
 367         return status;
 368 }
 369
 370 static int ocfs2_info_handle_freeinode(struct inode *inode,
 371                                        struct ocfs2_info_request __user *req)
 372 {
 373         u32 i;
 374         u64 blkno = -1;
 375         char namebuf[40];
 376         int status = -EFAULT, type = INODE_ALLOC_SYSTEM_INODE;
 377         struct ocfs2_info_freeinode *oifi = NULL;
 378         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 379         struct inode *inode_alloc = NULL;
 380
 381         oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
 382         if (!oifi) {
 383                 status = -ENOMEM;
 384                 mlog_errno(status);
 385                 goto out_err;
 386         }
 387
 388         if (o2info_from_user(*oifi, req))
 389                 goto bail;
 390
 391         oifi->ifi_slotnum = osb->max_slots;
 392
 393         for (i = 0; i < oifi->ifi_slotnum; i++) {
 394                 if (o2info_coherent(&oifi->ifi_req)) {
 395                         inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
 396                         if (!inode_alloc) {
 397                                 mlog(ML_ERROR, "unable to get alloc inode in "
 398                                     "slot %u\n", i);
 399                                 status = -EIO;
 400                                 goto bail;
 401                         }
 402                 } else {
 403                         ocfs2_sprintf_system_inode_name(namebuf,
 404                                                         sizeof(namebuf),
 405                                                         type, i);
 406                         status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 407                                                             namebuf,
 408                                                             strlen(namebuf),
 409                                                             &blkno);
 410                         if (status < 0) {
 411                                 status = -ENOENT;
 412                                 goto bail;
 413                         }
 414                 }
 415
 416                 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
 417
 418                 iput(inode_alloc);
 419                 inode_alloc = NULL;
 420
 421                 if (status < 0)
 422                         goto bail;
 423         }
 424
 425         o2info_set_request_filled(&oifi->ifi_req);
 426
 427         if (o2info_to_user(*oifi, req))
 428                 goto bail;
 429
 430         status = 0;
 431 bail:
 432         if (status)
 433                 o2info_set_request_error(&oifi->ifi_req, req);
 434
 435         kfree(oifi);
 436 out_err:
 437         return status;
 438 }
 439
 440 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 441                                    unsigned int chunksize)
 442 {
 443         int index;
 444
 445         index = __ilog2_u32(chunksize);
 446         if (index >= OCFS2_INFO_MAX_HIST)
 447                 index = OCFS2_INFO_MAX_HIST - 1;
 448
 449         hist->fc_chunks[index]++;
 450         hist->fc_clusters[index] += chunksize;
 451 }
 452
 453 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
 454                                unsigned int chunksize)
 455 {
 456         if (chunksize > stats->ffs_max)
 457                 stats->ffs_max = chunksize;
 458
 459         if (chunksize < stats->ffs_min)
 460                 stats->ffs_min = chunksize;
 461
 462         stats->ffs_avg += chunksize;
 463         stats->ffs_free_chunks_real++;
 464 }
 465
 466 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
 467                                   unsigned int chunksize)
 468 {
 469         o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
 470         o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
 471 }
 472
 473 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
 474                                           struct inode *gb_inode,
 475                                           struct ocfs2_dinode *gb_dinode,
 476                                           struct ocfs2_chain_rec *rec,
 477                                           struct ocfs2_info_freefrag *ffg,
 478                                           u32 chunks_in_group)
 479 {
 480         int status = 0, used;
 481         u64 blkno;
 482
 483         struct buffer_head *bh = NULL;
 484         struct ocfs2_group_desc *bg = NULL;
 485
 486         unsigned int max_bits, num_clusters;
 487         unsigned int offset = 0, cluster, chunk;
 488         unsigned int chunk_free, last_chunksize = 0;
 489
 490         if (!le32_to_cpu(rec->c_free))
 491                 goto bail;
 492
 493         do {
 494                 if (!bg)
 495                         blkno = le64_to_cpu(rec->c_blkno);
 496                 else
 497                         blkno = le64_to_cpu(bg->bg_next_group);
 498
 499                 if (bh) {
 500                         brelse(bh);
 501                         bh = NULL;
 502                 }
 503
 504                 if (o2info_coherent(&ffg->iff_req))
 505                         status = ocfs2_read_group_descriptor(gb_inode,
 506                                                              gb_dinode,
 507                                                              blkno, &bh);
 508                 else
 509                         status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 510
 511                 if (status < 0) {
 512                         mlog(ML_ERROR, "Can't read the group descriptor # "
 513                              "%llu from device.", (unsigned long long)blkno);
 514                         status = -EIO;
 515                         goto bail;
 516                 }
 517
 518                 bg = (struct ocfs2_group_desc *)bh->b_data;
 519
 520                 if (!le16_to_cpu(bg->bg_free_bits_count))
 521                         continue;
 522
 523                 max_bits = le16_to_cpu(bg->bg_bits);
 524                 offset = 0;
 525
 526                 for (chunk = 0; chunk < chunks_in_group; chunk++) {
 527                         /*
 528                          * last chunk may be not an entire one.
 529                          */
 530                         if ((offset + ffg->iff_chunksize) > max_bits)
 531                                 num_clusters = max_bits - offset;
 532                         else
 533                                 num_clusters = ffg->iff_chunksize;
 534
 535                         chunk_free = 0;
 536                         for (cluster = 0; cluster < num_clusters; cluster++) {
 537                                 used = ocfs2_test_bit(offset,
 538                                                 (unsigned long *)bg->bg_bitmap);
 539                                 /*
 540                                  * - chunk_free counts free clusters in #N chunk.
 541                                  * - last_chunksize records the size(in) clusters
 542                                  *   for the last real free chunk being counted.
 543                                  */
 544                                 if (!used) {
 545                                         last_chunksize++;
 546                                         chunk_free++;
 547                                 }
 548
 549                                 if (used && last_chunksize) {
 550                                         ocfs2_info_update_ffg(ffg,
 551                                                               last_chunksize);
 552                                         last_chunksize = 0;
 553                                 }
 554
 555                                 offset++;
 556                         }
 557
 558                         if (chunk_free == ffg->iff_chunksize)
 559                                 ffg->iff_ffs.ffs_free_chunks++;
 560                 }
 561
 562                 /*
 563                  * need to update the info for last free chunk.
 564                  */
 565                 if (last_chunksize)
 566                         ocfs2_info_update_ffg(ffg, last_chunksize);
 567
 568         } while (le64_to_cpu(bg->bg_next_group));
 569
 570 bail:
 571         brelse(bh);
 572
 573         return status;
 574 }
 575
 576 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
 577                                            struct inode *gb_inode, u64 blkno,
 578                                            struct ocfs2_info_freefrag *ffg)
 579 {
 580         u32 chunks_in_group;
 581         int status = 0, unlock = 0, i;
 582
 583         struct buffer_head *bh = NULL;
 584         struct ocfs2_chain_list *cl = NULL;
 585         struct ocfs2_chain_rec *rec = NULL;
 586         struct ocfs2_dinode *gb_dinode = NULL;
 587
 588         if (gb_inode)
 589                 mutex_lock(&gb_inode->i_mutex);
 590
 591         if (o2info_coherent(&ffg->iff_req)) {
 592                 status = ocfs2_inode_lock(gb_inode, &bh, 0);
 593                 if (status < 0) {
 594                         mlog_errno(status);
 595                         goto bail;
 596                 }
 597                 unlock = 1;
 598         } else {
 599                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 600                 if (status < 0) {
 601                         mlog_errno(status);
 602                         goto bail;
 603                 }
 604         }
 605
 606         gb_dinode = (struct ocfs2_dinode *)bh->b_data;
 607         cl = &(gb_dinode->id2.i_chain);
 608
 609         /*
 610          * Chunksize(in) clusters from userspace should be
 611          * less than clusters in a group.
 612          */
 613         if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
 614                 status = -EINVAL;
 615                 goto bail;
 616         }
 617
 618         memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
 619
 620         ffg->iff_ffs.ffs_min = ~0U;
 621         ffg->iff_ffs.ffs_clusters =
 622                         le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
 623         ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
 624                         le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
 625
 626         chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
 627
 628         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 629                 rec = &(cl->cl_recs[i]);
 630                 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
 631                                                         gb_dinode,
 632                                                         rec, ffg,
 633                                                         chunks_in_group);
 634                 if (status)
 635                         goto bail;
 636         }
 637
 638         if (ffg->iff_ffs.ffs_free_chunks_real)
 639                 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
 640                                         ffg->iff_ffs.ffs_free_chunks_real);
 641 bail:
 642         if (unlock)
 643                 ocfs2_inode_unlock(gb_inode, 0);
 644
 645         if (gb_inode)
 646                 mutex_unlock(&gb_inode->i_mutex);
 647
 648         if (gb_inode)
 649                 iput(gb_inode);
 650
 651         brelse(bh);
 652
 653         return status;
 654 }
 655
 656 static int ocfs2_info_handle_freefrag(struct inode *inode,
 657                                       struct ocfs2_info_request __user *req)
 658 {
 659         u64 blkno = -1;
 660         char namebuf[40];
 661         int status = -EFAULT, type = GLOBAL_BITMAP_SYSTEM_INODE;
 662
 663         struct ocfs2_info_freefrag *oiff;
 664         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 665         struct inode *gb_inode = NULL;
 666
 667         oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
 668         if (!oiff) {
 669                 status = -ENOMEM;
 670                 mlog_errno(status);
 671                 goto out_err;
 672         }
 673
 674         if (o2info_from_user(*oiff, req))
 675                 goto bail;
 676         /*
 677          * chunksize from userspace should be power of 2.
 678          */
 679         if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
 680             (!oiff->iff_chunksize)) {
 681                 status = -EINVAL;
 682                 goto bail;
 683         }
 684
 685         if (o2info_coherent(&oiff->iff_req)) {
 686                 gb_inode = ocfs2_get_system_file_inode(osb, type,
 687                                                        OCFS2_INVALID_SLOT);
 688                 if (!gb_inode) {
 689                         mlog(ML_ERROR, "unable to get global_bitmap inode\n");
 690                         status = -EIO;
 691                         goto bail;
 692                 }
 693         } else {
 694                 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
 695                                                 OCFS2_INVALID_SLOT);
 696                 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 697                                                     namebuf,
 698                                                     strlen(namebuf),
 699                                                     &blkno);
 700                 if (status < 0) {
 701                         status = -ENOENT;
 702                         goto bail;
 703                 }
 704         }
 705
 706         status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
 707         if (status < 0)
 708                 goto bail;
 709
 710         o2info_set_request_filled(&oiff->iff_req);
 711
 712         if (o2info_to_user(*oiff, req)) {
 713                 status = -EFAULT;
 714                 goto bail;
 715         }
 716
 717         status = 0;
 718 bail:
 719         if (status)
 720                 o2info_set_request_error(&oiff->iff_req, req);
 721
 722         kfree(oiff);
 723 out_err:
 724         return status;
 725 }
 726
 727 static int ocfs2_info_handle_unknown(struct inode *inode,
 728                                      struct ocfs2_info_request __user *req)
 729 {
 730         int status = -EFAULT;
 731         struct ocfs2_info_request oir;
 732
 733         if (o2info_from_user(oir, req))
 734                 goto bail;
 735
 736         o2info_clear_request_filled(&oir);
 737
 738         if (o2info_to_user(oir, req))
 739                 goto bail;
 740
 741         status = 0;
 742 bail:
 743         if (status)
 744                 o2info_set_request_error(&oir, req);
 745
 746         return status;
 747 }
 748
 749 /*
 750  * Validate and distinguish OCFS2_IOC_INFO requests.
 751  *
 752  * - validate the magic number.
 753  * - distinguish different requests.
 754  * - validate size of different requests.
 755  */
 756 static int ocfs2_info_handle_request(struct inode *inode,
 757                                      struct ocfs2_info_request __user *req)
 758 {
 759         int status = -EFAULT;
 760         struct ocfs2_info_request oir;
 761
 762         if (o2info_from_user(oir, req))
 763                 goto bail;
 764
 765         status = -EINVAL;
 766         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 767                 goto bail;
 768
 769         switch (oir.ir_code) {
 770         case OCFS2_INFO_BLOCKSIZE:
 771                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 772                         status = ocfs2_info_handle_blocksize(inode, req);
 773                 break;
 774         case OCFS2_INFO_CLUSTERSIZE:
 775                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 776                         status = ocfs2_info_handle_clustersize(inode, req);
 777                 break;
 778         case OCFS2_INFO_MAXSLOTS:
 779                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 780                         status = ocfs2_info_handle_maxslots(inode, req);
 781                 break;
 782         case OCFS2_INFO_LABEL:
 783                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 784                         status = ocfs2_info_handle_label(inode, req);
 785                 break;
 786         case OCFS2_INFO_UUID:
 787                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 788                         status = ocfs2_info_handle_uuid(inode, req);
 789                 break;
 790         case OCFS2_INFO_FS_FEATURES:
 791                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 792                         status = ocfs2_info_handle_fs_features(inode, req);
 793                 break;
 794         case OCFS2_INFO_JOURNAL_SIZE:
 795                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 796                         status = ocfs2_info_handle_journal_size(inode, req);
 797                 break;
 798         case OCFS2_INFO_FREEINODE:
 799                 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
 800                         status = ocfs2_info_handle_freeinode(inode, req);
 801                 break;
 802         case OCFS2_INFO_FREEFRAG:
 803                 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
 804                         status = ocfs2_info_handle_freefrag(inode, req);
 805                 break;
 806         default:
 807                 status = ocfs2_info_handle_unknown(inode, req);
 808                 break;
 809         }
 810
 811 bail:
 812         return status;
 813 }
 814
 815 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 816                                  u64 *req_addr, int compat_flag)
 817 {
 818         int status = -EFAULT;
 819         u64 __user *bp = NULL;
 820
 821         if (compat_flag) {
 822 #ifdef CONFIG_COMPAT
 823                 /*
 824                  * pointer bp stores the base address of a pointers array,
 825                  * which collects all addresses of separate request.
 826                  */
 827                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 828 #else
 829                 BUG();
 830 #endif
 831         } else
 832                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 833
 834         if (o2info_from_user(*req_addr, bp + idx))
 835                 goto bail;
 836
 837         status = 0;
 838 bail:
 839         return status;
 840 }
 841
 842 /*
 843  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 844  *
 845  * ocfs2_info_handle() recevies a large info aggregation, grab and
 846  * validate the request count from header, then break it into small
 847  * pieces, later specific handlers can handle them one by one.
 848  *
 849  * Idea here is to make each separate request small enough to ensure
 850  * a better backward&forward compatibility, since a small piece of
 851  * request will be less likely to be broken if disk layout get changed.
 852  */
 853 static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
 854                              int compat_flag)
 855 {
 856         int i, status = 0;
 857         u64 req_addr;
 858         struct ocfs2_info_request __user *reqp;
 859
 860         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 861             (!info->oi_requests)) {
 862                 status = -EINVAL;
 863                 goto bail;
 864         }
 865
 866         for (i = 0; i < info->oi_count; i++) {
 867
 868                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 869                 if (status)
 870                         break;
 871
 872                 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
 873                 if (!reqp) {
 874                         status = -EINVAL;
 875                         goto bail;
 876                 }
 877
 878                 status = ocfs2_info_handle_request(inode, reqp);
 879                 if (status)
 880                         break;
 881         }
 882
 883 bail:
 884         return status;
 885 }
 886
 887 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 888 {
 889         struct inode *inode = file_inode(filp);
 890         unsigned int flags;
 891         int new_clusters;
 892         int status;
 893         struct ocfs2_space_resv sr;
 894         struct ocfs2_new_group_input input;
 895         struct reflink_arguments args;
 896         const char __user *old_path;
 897         const char __user *new_path;
 898         bool preserve;
 899         struct ocfs2_info info;
 900         void __user *argp = (void __user *)arg;
 901
 902         switch (cmd) {
 903         case OCFS2_IOC_GETFLAGS:
 904                 status = ocfs2_get_inode_attr(inode, &flags);
 905                 if (status < 0)
 906                         return status;
 907
 908                 flags &= OCFS2_FL_VISIBLE;
 909                 return put_user(flags, (int __user *) arg);
 910         case OCFS2_IOC_SETFLAGS:
 911                 if (get_user(flags, (int __user *) arg))
 912                         return -EFAULT;
 913
 914                 status = mnt_want_write_file(filp);
 915                 if (status)
 916                         return status;
 917                 status = ocfs2_set_inode_attr(inode, flags,
 918                         OCFS2_FL_MODIFIABLE);
 919                 mnt_drop_write_file(filp);
 920                 return status;
 921         case OCFS2_IOC_RESVSP:
 922         case OCFS2_IOC_RESVSP64:
 923         case OCFS2_IOC_UNRESVSP:
 924         case OCFS2_IOC_UNRESVSP64:
 925                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 926                         return -EFAULT;
 927
 928                 return ocfs2_change_file_space(filp, cmd, &sr);
 929         case OCFS2_IOC_GROUP_EXTEND:
 930                 if (!capable(CAP_SYS_RESOURCE))
 931                         return -EPERM;
 932
 933                 if (get_user(new_clusters, (int __user *)arg))
 934                         return -EFAULT;
 935
 936                 status = mnt_want_write_file(filp);
 937                 if (status)
 938                         return status;
 939                 status = ocfs2_group_extend(inode, new_clusters);
 940                 mnt_drop_write_file(filp);
 941                 return status;
 942         case OCFS2_IOC_GROUP_ADD:
 943         case OCFS2_IOC_GROUP_ADD64:
 944                 if (!capable(CAP_SYS_RESOURCE))
 945                         return -EPERM;
 946
 947                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 948                         return -EFAULT;
 949
 950                 status = mnt_want_write_file(filp);
 951                 if (status)
 952                         return status;
 953                 status = ocfs2_group_add(inode, &input);
 954                 mnt_drop_write_file(filp);
 955                 return status;
 956         case OCFS2_IOC_REFLINK:
 957                 if (copy_from_user(&args, argp, sizeof(args)))
 958                         return -EFAULT;
 959                 old_path = (const char __user *)(unsigned long)args.old_path;
 960                 new_path = (const char __user *)(unsigned long)args.new_path;
 961                 preserve = (args.preserve != 0);
 962
 963                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 964         case OCFS2_IOC_INFO:
 965                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 966                         return -EFAULT;
 967
 968                 return ocfs2_info_handle(inode, &info, 0);
 969         case FITRIM:
 970         {
 971                 struct super_block *sb = inode->i_sb;
 972                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 973                 struct fstrim_range range;
 974                 int ret = 0;
 975
 976                 if (!capable(CAP_SYS_ADMIN))
 977                         return -EPERM;
 978
 979                 if (!blk_queue_discard(q))
 980                         return -EOPNOTSUPP;
 981
 982                 if (copy_from_user(&range, argp, sizeof(range)))
 983                         return -EFAULT;
 984
 985                 range.minlen = max_t(u64, q->limits.discard_granularity,
 986                                      range.minlen);
 987                 ret = ocfs2_trim_fs(sb, &range);
 988                 if (ret < 0)
 989                         return ret;
 990
 991                 if (copy_to_user(argp, &range, sizeof(range)))
 992                         return -EFAULT;
 993
 994                 return 0;
 995         }
 996         case OCFS2_IOC_MOVE_EXT:
 997                 return ocfs2_ioctl_move_extents(filp, argp);
 998         default:
 999                 return -ENOTTY;
1000         }
1001 }
1002
1003 #ifdef CONFIG_COMPAT
1004 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
1005 {
1006         bool preserve;
1007         struct reflink_arguments args;
1008         struct inode *inode = file_inode(file);
1009         struct ocfs2_info info;
1010         void __user *argp = (void __user *)arg;
1011
1012         switch (cmd) {
1013         case OCFS2_IOC32_GETFLAGS:
1014                 cmd = OCFS2_IOC_GETFLAGS;
1015                 break;
1016         case OCFS2_IOC32_SETFLAGS:
1017                 cmd = OCFS2_IOC_SETFLAGS;
1018                 break;
1019         case OCFS2_IOC_RESVSP:
1020         case OCFS2_IOC_RESVSP64:
1021         case OCFS2_IOC_UNRESVSP:
1022         case OCFS2_IOC_UNRESVSP64:
1023         case OCFS2_IOC_GROUP_EXTEND:
1024         case OCFS2_IOC_GROUP_ADD:
1025         case OCFS2_IOC_GROUP_ADD64:
1026         case FITRIM:
1027                 break;
1028         case OCFS2_IOC_REFLINK:
1029                 if (copy_from_user(&args, argp, sizeof(args)))
1030                         return -EFAULT;
1031                 preserve = (args.preserve != 0);
1032
1033                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
1034                                            compat_ptr(args.new_path), preserve);
1035         case OCFS2_IOC_INFO:
1036                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
1037                         return -EFAULT;
1038
1039                 return ocfs2_info_handle(inode, &info, 1);
1040         case OCFS2_IOC_MOVE_EXT:
1041                 break;
1042         default:
1043                 return -ENOIOCTLCMD;
1044         }
1045
1046         return ocfs2_ioctl(file, cmd, arg);
1047 }
1048 #endif