fs/ocfs2/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ocfs2/ioctl.c
   4  *
   5  * Copyright (C) 2006 Herbert Poetzl
   6  * adapted from Remy Card's ext2/ioctl.c
   7  */
   8
   9 #include <linux/fs.h>
  10 #include <linux/mount.h>
  11 #include <linux/blkdev.h>
  12 #include <linux/compat.h>
  13
  14 #include <cluster/masklog.h>
  15
  16 #include "ocfs2.h"
  17 #include "alloc.h"
  18 #include "dlmglue.h"
  19 #include "file.h"
  20 #include "inode.h"
  21 #include "journal.h"
  22
  23 #include "ocfs2_fs.h"
  24 #include "ioctl.h"
  25 #include "resize.h"
  26 #include "refcounttree.h"
  27 #include "sysfile.h"
  28 #include "dir.h"
  29 #include "buffer_head_io.h"
  30 #include "suballoc.h"
  31 #include "move_extents.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 is just a best-effort to tell userspace that this request
  40  * 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         inode_lock(inode);
  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         inode_unlock(inode);
 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         struct ocfs2_info_blocksize oib;
 150
 151         if (o2info_from_user(oib, req))
 152                 return -EFAULT;
 153
 154         oib.ib_blocksize = inode->i_sb->s_blocksize;
 155
 156         o2info_set_request_filled(&oib.ib_req);
 157
 158         if (o2info_to_user(oib, req))
 159                 return -EFAULT;
 160
 161         return 0;
 162 }
 163
 164 static int ocfs2_info_handle_clustersize(struct inode *inode,
 165                                          struct ocfs2_info_request __user *req)
 166 {
 167         struct ocfs2_info_clustersize oic;
 168         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 169
 170         if (o2info_from_user(oic, req))
 171                 return -EFAULT;
 172
 173         oic.ic_clustersize = osb->s_clustersize;
 174
 175         o2info_set_request_filled(&oic.ic_req);
 176
 177         if (o2info_to_user(oic, req))
 178                 return -EFAULT;
 179
 180         return 0;
 181 }
 182
 183 static int ocfs2_info_handle_maxslots(struct inode *inode,
 184                                       struct ocfs2_info_request __user *req)
 185 {
 186         struct ocfs2_info_maxslots oim;
 187         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 188
 189         if (o2info_from_user(oim, req))
 190                 return -EFAULT;
 191
 192         oim.im_max_slots = osb->max_slots;
 193
 194         o2info_set_request_filled(&oim.im_req);
 195
 196         if (o2info_to_user(oim, req))
 197                 return -EFAULT;
 198
 199         return 0;
 200 }
 201
 202 static int ocfs2_info_handle_label(struct inode *inode,
 203                                    struct ocfs2_info_request __user *req)
 204 {
 205         struct ocfs2_info_label oil;
 206         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 207
 208         if (o2info_from_user(oil, req))
 209                 return -EFAULT;
 210
 211         memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
 212
 213         o2info_set_request_filled(&oil.il_req);
 214
 215         if (o2info_to_user(oil, req))
 216                 return -EFAULT;
 217
 218         return 0;
 219 }
 220
 221 static int ocfs2_info_handle_uuid(struct inode *inode,
 222                                   struct ocfs2_info_request __user *req)
 223 {
 224         struct ocfs2_info_uuid oiu;
 225         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 226
 227         if (o2info_from_user(oiu, req))
 228                 return -EFAULT;
 229
 230         memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
 231
 232         o2info_set_request_filled(&oiu.iu_req);
 233
 234         if (o2info_to_user(oiu, req))
 235                 return -EFAULT;
 236
 237         return 0;
 238 }
 239
 240 static int ocfs2_info_handle_fs_features(struct inode *inode,
 241                                          struct ocfs2_info_request __user *req)
 242 {
 243         struct ocfs2_info_fs_features oif;
 244         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 245
 246         if (o2info_from_user(oif, req))
 247                 return -EFAULT;
 248
 249         oif.if_compat_features = osb->s_feature_compat;
 250         oif.if_incompat_features = osb->s_feature_incompat;
 251         oif.if_ro_compat_features = osb->s_feature_ro_compat;
 252
 253         o2info_set_request_filled(&oif.if_req);
 254
 255         if (o2info_to_user(oif, req))
 256                 return -EFAULT;
 257
 258         return 0;
 259 }
 260
 261 static int ocfs2_info_handle_journal_size(struct inode *inode,
 262                                           struct ocfs2_info_request __user *req)
 263 {
 264         struct ocfs2_info_journal_size oij;
 265         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 266
 267         if (o2info_from_user(oij, req))
 268                 return -EFAULT;
 269
 270         oij.ij_journal_size = i_size_read(osb->journal->j_inode);
 271
 272         o2info_set_request_filled(&oij.ij_req);
 273
 274         if (o2info_to_user(oij, req))
 275                 return -EFAULT;
 276
 277         return 0;
 278 }
 279
 280 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
 281                                        struct inode *inode_alloc, u64 blkno,
 282                                        struct ocfs2_info_freeinode *fi,
 283                                        u32 slot)
 284 {
 285         int status = 0, unlock = 0;
 286
 287         struct buffer_head *bh = NULL;
 288         struct ocfs2_dinode *dinode_alloc = NULL;
 289
 290         if (inode_alloc)
 291                 inode_lock(inode_alloc);
 292
 293         if (o2info_coherent(&fi->ifi_req)) {
 294                 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
 295                 if (status < 0) {
 296                         mlog_errno(status);
 297                         goto bail;
 298                 }
 299                 unlock = 1;
 300         } else {
 301                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 302                 if (status < 0) {
 303                         mlog_errno(status);
 304                         goto bail;
 305                 }
 306         }
 307
 308         dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
 309
 310         fi->ifi_stat[slot].lfi_total =
 311                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
 312         fi->ifi_stat[slot].lfi_free =
 313                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
 314                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
 315
 316 bail:
 317         if (unlock)
 318                 ocfs2_inode_unlock(inode_alloc, 0);
 319
 320         if (inode_alloc)
 321                 inode_unlock(inode_alloc);
 322
 323         brelse(bh);
 324
 325         return status;
 326 }
 327
 328 static int ocfs2_info_handle_freeinode(struct inode *inode,
 329                                        struct ocfs2_info_request __user *req)
 330 {
 331         u32 i;
 332         u64 blkno = -1;
 333         char namebuf[40];
 334         int status, type = INODE_ALLOC_SYSTEM_INODE;
 335         struct ocfs2_info_freeinode *oifi = NULL;
 336         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 337         struct inode *inode_alloc = NULL;
 338
 339         oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
 340         if (!oifi) {
 341                 status = -ENOMEM;
 342                 mlog_errno(status);
 343                 goto out_err;
 344         }
 345
 346         if (o2info_from_user(*oifi, req)) {
 347                 status = -EFAULT;
 348                 goto out_free;
 349         }
 350
 351         oifi->ifi_slotnum = osb->max_slots;
 352
 353         for (i = 0; i < oifi->ifi_slotnum; i++) {
 354                 if (o2info_coherent(&oifi->ifi_req)) {
 355                         inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
 356                         if (!inode_alloc) {
 357                                 mlog(ML_ERROR, "unable to get alloc inode in "
 358                                     "slot %u\n", i);
 359                                 status = -EIO;
 360                                 goto bail;
 361                         }
 362                 } else {
 363                         ocfs2_sprintf_system_inode_name(namebuf,
 364                                                         sizeof(namebuf),
 365                                                         type, i);
 366                         status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 367                                                             namebuf,
 368                                                             strlen(namebuf),
 369                                                             &blkno);
 370                         if (status < 0) {
 371                                 status = -ENOENT;
 372                                 goto bail;
 373                         }
 374                 }
 375
 376                 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
 377
 378                 iput(inode_alloc);
 379                 inode_alloc = NULL;
 380
 381                 if (status < 0)
 382                         goto bail;
 383         }
 384
 385         o2info_set_request_filled(&oifi->ifi_req);
 386
 387         if (o2info_to_user(*oifi, req)) {
 388                 status = -EFAULT;
 389                 goto out_free;
 390         }
 391
 392         status = 0;
 393 bail:
 394         if (status)
 395                 o2info_set_request_error(&oifi->ifi_req, req);
 396 out_free:
 397         kfree(oifi);
 398 out_err:
 399         return status;
 400 }
 401
 402 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 403                                    unsigned int chunksize)
 404 {
 405         u32 index;
 406
 407         index = __ilog2_u32(chunksize);
 408         if (index >= OCFS2_INFO_MAX_HIST)
 409                 index = OCFS2_INFO_MAX_HIST - 1;
 410
 411         hist->fc_chunks[index]++;
 412         hist->fc_clusters[index] += chunksize;
 413 }
 414
 415 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
 416                                unsigned int chunksize)
 417 {
 418         if (chunksize > stats->ffs_max)
 419                 stats->ffs_max = chunksize;
 420
 421         if (chunksize < stats->ffs_min)
 422                 stats->ffs_min = chunksize;
 423
 424         stats->ffs_avg += chunksize;
 425         stats->ffs_free_chunks_real++;
 426 }
 427
 428 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
 429                                   unsigned int chunksize)
 430 {
 431         o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
 432         o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
 433 }
 434
 435 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
 436                                           struct inode *gb_inode,
 437                                           struct ocfs2_dinode *gb_dinode,
 438                                           struct ocfs2_chain_rec *rec,
 439                                           struct ocfs2_info_freefrag *ffg,
 440                                           u32 chunks_in_group)
 441 {
 442         int status = 0, used;
 443         u64 blkno;
 444
 445         struct buffer_head *bh = NULL;
 446         struct ocfs2_group_desc *bg = NULL;
 447
 448         unsigned int max_bits, num_clusters;
 449         unsigned int offset = 0, cluster, chunk;
 450         unsigned int chunk_free, last_chunksize = 0;
 451
 452         if (!le32_to_cpu(rec->c_free))
 453                 goto bail;
 454
 455         do {
 456                 if (!bg)
 457                         blkno = le64_to_cpu(rec->c_blkno);
 458                 else
 459                         blkno = le64_to_cpu(bg->bg_next_group);
 460
 461                 if (bh) {
 462                         brelse(bh);
 463                         bh = NULL;
 464                 }
 465
 466                 if (o2info_coherent(&ffg->iff_req))
 467                         status = ocfs2_read_group_descriptor(gb_inode,
 468                                                              gb_dinode,
 469                                                              blkno, &bh);
 470                 else
 471                         status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 472
 473                 if (status < 0) {
 474                         mlog(ML_ERROR, "Can't read the group descriptor # "
 475                              "%llu from device.", (unsigned long long)blkno);
 476                         status = -EIO;
 477                         goto bail;
 478                 }
 479
 480                 bg = (struct ocfs2_group_desc *)bh->b_data;
 481
 482                 if (!le16_to_cpu(bg->bg_free_bits_count))
 483                         continue;
 484
 485                 max_bits = le16_to_cpu(bg->bg_bits);
 486                 offset = 0;
 487
 488                 for (chunk = 0; chunk < chunks_in_group; chunk++) {
 489                         /*
 490                          * last chunk may be not an entire one.
 491                          */
 492                         if ((offset + ffg->iff_chunksize) > max_bits)
 493                                 num_clusters = max_bits - offset;
 494                         else
 495                                 num_clusters = ffg->iff_chunksize;
 496
 497                         chunk_free = 0;
 498                         for (cluster = 0; cluster < num_clusters; cluster++) {
 499                                 used = ocfs2_test_bit(offset,
 500                                                 (unsigned long *)bg->bg_bitmap);
 501                                 /*
 502                                  * - chunk_free counts free clusters in #N chunk.
 503                                  * - last_chunksize records the size(in) clusters
 504                                  *   for the last real free chunk being counted.
 505                                  */
 506                                 if (!used) {
 507                                         last_chunksize++;
 508                                         chunk_free++;
 509                                 }
 510
 511                                 if (used && last_chunksize) {
 512                                         ocfs2_info_update_ffg(ffg,
 513                                                               last_chunksize);
 514                                         last_chunksize = 0;
 515                                 }
 516
 517                                 offset++;
 518                         }
 519
 520                         if (chunk_free == ffg->iff_chunksize)
 521                                 ffg->iff_ffs.ffs_free_chunks++;
 522                 }
 523
 524                 /*
 525                  * need to update the info for last free chunk.
 526                  */
 527                 if (last_chunksize)
 528                         ocfs2_info_update_ffg(ffg, last_chunksize);
 529
 530         } while (le64_to_cpu(bg->bg_next_group));
 531
 532 bail:
 533         brelse(bh);
 534
 535         return status;
 536 }
 537
 538 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
 539                                            struct inode *gb_inode, u64 blkno,
 540                                            struct ocfs2_info_freefrag *ffg)
 541 {
 542         u32 chunks_in_group;
 543         int status = 0, unlock = 0, i;
 544
 545         struct buffer_head *bh = NULL;
 546         struct ocfs2_chain_list *cl = NULL;
 547         struct ocfs2_chain_rec *rec = NULL;
 548         struct ocfs2_dinode *gb_dinode = NULL;
 549
 550         if (gb_inode)
 551                 inode_lock(gb_inode);
 552
 553         if (o2info_coherent(&ffg->iff_req)) {
 554                 status = ocfs2_inode_lock(gb_inode, &bh, 0);
 555                 if (status < 0) {
 556                         mlog_errno(status);
 557                         goto bail;
 558                 }
 559                 unlock = 1;
 560         } else {
 561                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 562                 if (status < 0) {
 563                         mlog_errno(status);
 564                         goto bail;
 565                 }
 566         }
 567
 568         gb_dinode = (struct ocfs2_dinode *)bh->b_data;
 569         cl = &(gb_dinode->id2.i_chain);
 570
 571         /*
 572          * Chunksize(in) clusters from userspace should be
 573          * less than clusters in a group.
 574          */
 575         if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
 576                 status = -EINVAL;
 577                 goto bail;
 578         }
 579
 580         memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
 581
 582         ffg->iff_ffs.ffs_min = ~0U;
 583         ffg->iff_ffs.ffs_clusters =
 584                         le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
 585         ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
 586                         le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
 587
 588         chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
 589
 590         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 591                 rec = &(cl->cl_recs[i]);
 592                 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
 593                                                         gb_dinode,
 594                                                         rec, ffg,
 595                                                         chunks_in_group);
 596                 if (status)
 597                         goto bail;
 598         }
 599
 600         if (ffg->iff_ffs.ffs_free_chunks_real)
 601                 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
 602                                         ffg->iff_ffs.ffs_free_chunks_real);
 603 bail:
 604         if (unlock)
 605                 ocfs2_inode_unlock(gb_inode, 0);
 606
 607         if (gb_inode)
 608                 inode_unlock(gb_inode);
 609
 610         iput(gb_inode);
 611         brelse(bh);
 612
 613         return status;
 614 }
 615
 616 static int ocfs2_info_handle_freefrag(struct inode *inode,
 617                                       struct ocfs2_info_request __user *req)
 618 {
 619         u64 blkno = -1;
 620         char namebuf[40];
 621         int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
 622
 623         struct ocfs2_info_freefrag *oiff;
 624         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 625         struct inode *gb_inode = NULL;
 626
 627         oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
 628         if (!oiff) {
 629                 status = -ENOMEM;
 630                 mlog_errno(status);
 631                 goto out_err;
 632         }
 633
 634         if (o2info_from_user(*oiff, req)) {
 635                 status = -EFAULT;
 636                 goto out_free;
 637         }
 638         /*
 639          * chunksize from userspace should be power of 2.
 640          */
 641         if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
 642             (!oiff->iff_chunksize)) {
 643                 status = -EINVAL;
 644                 goto bail;
 645         }
 646
 647         if (o2info_coherent(&oiff->iff_req)) {
 648                 gb_inode = ocfs2_get_system_file_inode(osb, type,
 649                                                        OCFS2_INVALID_SLOT);
 650                 if (!gb_inode) {
 651                         mlog(ML_ERROR, "unable to get global_bitmap inode\n");
 652                         status = -EIO;
 653                         goto bail;
 654                 }
 655         } else {
 656                 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
 657                                                 OCFS2_INVALID_SLOT);
 658                 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 659                                                     namebuf,
 660                                                     strlen(namebuf),
 661                                                     &blkno);
 662                 if (status < 0) {
 663                         status = -ENOENT;
 664                         goto bail;
 665                 }
 666         }
 667
 668         status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
 669         if (status < 0)
 670                 goto bail;
 671
 672         o2info_set_request_filled(&oiff->iff_req);
 673
 674         if (o2info_to_user(*oiff, req)) {
 675                 status = -EFAULT;
 676                 goto out_free;
 677         }
 678
 679         status = 0;
 680 bail:
 681         if (status)
 682                 o2info_set_request_error(&oiff->iff_req, req);
 683 out_free:
 684         kfree(oiff);
 685 out_err:
 686         return status;
 687 }
 688
 689 static int ocfs2_info_handle_unknown(struct inode *inode,
 690                                      struct ocfs2_info_request __user *req)
 691 {
 692         struct ocfs2_info_request oir;
 693
 694         if (o2info_from_user(oir, req))
 695                 return -EFAULT;
 696
 697         o2info_clear_request_filled(&oir);
 698
 699         if (o2info_to_user(oir, req))
 700                 return -EFAULT;
 701
 702         return 0;
 703 }
 704
 705 /*
 706  * Validate and distinguish OCFS2_IOC_INFO requests.
 707  *
 708  * - validate the magic number.
 709  * - distinguish different requests.
 710  * - validate size of different requests.
 711  */
 712 static int ocfs2_info_handle_request(struct inode *inode,
 713                                      struct ocfs2_info_request __user *req)
 714 {
 715         int status = -EFAULT;
 716         struct ocfs2_info_request oir;
 717
 718         if (o2info_from_user(oir, req))
 719                 goto bail;
 720
 721         status = -EINVAL;
 722         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 723                 goto bail;
 724
 725         switch (oir.ir_code) {
 726         case OCFS2_INFO_BLOCKSIZE:
 727                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 728                         status = ocfs2_info_handle_blocksize(inode, req);
 729                 break;
 730         case OCFS2_INFO_CLUSTERSIZE:
 731                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 732                         status = ocfs2_info_handle_clustersize(inode, req);
 733                 break;
 734         case OCFS2_INFO_MAXSLOTS:
 735                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 736                         status = ocfs2_info_handle_maxslots(inode, req);
 737                 break;
 738         case OCFS2_INFO_LABEL:
 739                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 740                         status = ocfs2_info_handle_label(inode, req);
 741                 break;
 742         case OCFS2_INFO_UUID:
 743                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 744                         status = ocfs2_info_handle_uuid(inode, req);
 745                 break;
 746         case OCFS2_INFO_FS_FEATURES:
 747                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 748                         status = ocfs2_info_handle_fs_features(inode, req);
 749                 break;
 750         case OCFS2_INFO_JOURNAL_SIZE:
 751                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 752                         status = ocfs2_info_handle_journal_size(inode, req);
 753                 break;
 754         case OCFS2_INFO_FREEINODE:
 755                 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
 756                         status = ocfs2_info_handle_freeinode(inode, req);
 757                 break;
 758         case OCFS2_INFO_FREEFRAG:
 759                 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
 760                         status = ocfs2_info_handle_freefrag(inode, req);
 761                 break;
 762         default:
 763                 status = ocfs2_info_handle_unknown(inode, req);
 764                 break;
 765         }
 766
 767 bail:
 768         return status;
 769 }
 770
 771 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 772                                  u64 *req_addr, int compat_flag)
 773 {
 774         int status = -EFAULT;
 775         u64 __user *bp = NULL;
 776
 777         if (compat_flag) {
 778 #ifdef CONFIG_COMPAT
 779                 /*
 780                  * pointer bp stores the base address of a pointers array,
 781                  * which collects all addresses of separate request.
 782                  */
 783                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 784 #else
 785                 BUG();
 786 #endif
 787         } else
 788                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 789
 790         if (o2info_from_user(*req_addr, bp + idx))
 791                 goto bail;
 792
 793         status = 0;
 794 bail:
 795         return status;
 796 }
 797
 798 /*
 799  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 800  *
 801  * ocfs2_info_handle() recevies a large info aggregation, grab and
 802  * validate the request count from header, then break it into small
 803  * pieces, later specific handlers can handle them one by one.
 804  *
 805  * Idea here is to make each separate request small enough to ensure
 806  * a better backward&forward compatibility, since a small piece of
 807  * request will be less likely to be broken if disk layout get changed.
 808  */
 809 static int ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info,
 810                              int compat_flag)
 811 {
 812         int i, status = 0;
 813         u64 req_addr;
 814         struct ocfs2_info_request __user *reqp;
 815
 816         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 817             (!info->oi_requests)) {
 818                 status = -EINVAL;
 819                 goto bail;
 820         }
 821
 822         for (i = 0; i < info->oi_count; i++) {
 823
 824                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 825                 if (status)
 826                         break;
 827
 828                 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
 829                 if (!reqp) {
 830                         status = -EINVAL;
 831                         goto bail;
 832                 }
 833
 834                 status = ocfs2_info_handle_request(inode, reqp);
 835                 if (status)
 836                         break;
 837         }
 838
 839 bail:
 840         return status;
 841 }
 842
 843 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 844 {
 845         struct inode *inode = file_inode(filp);
 846         unsigned int flags;
 847         int new_clusters;
 848         int status;
 849         struct ocfs2_space_resv sr;
 850         struct ocfs2_new_group_input input;
 851         struct reflink_arguments args;
 852         const char __user *old_path;
 853         const char __user *new_path;
 854         bool preserve;
 855         struct ocfs2_info info;
 856         void __user *argp = (void __user *)arg;
 857
 858         switch (cmd) {
 859         case OCFS2_IOC_GETFLAGS:
 860                 status = ocfs2_get_inode_attr(inode, &flags);
 861                 if (status < 0)
 862                         return status;
 863
 864                 flags &= OCFS2_FL_VISIBLE;
 865                 return put_user(flags, (int __user *) arg);
 866         case OCFS2_IOC_SETFLAGS:
 867                 if (get_user(flags, (int __user *) arg))
 868                         return -EFAULT;
 869
 870                 status = mnt_want_write_file(filp);
 871                 if (status)
 872                         return status;
 873                 status = ocfs2_set_inode_attr(inode, flags,
 874                         OCFS2_FL_MODIFIABLE);
 875                 mnt_drop_write_file(filp);
 876                 return status;
 877         case OCFS2_IOC_RESVSP:
 878         case OCFS2_IOC_RESVSP64:
 879         case OCFS2_IOC_UNRESVSP:
 880         case OCFS2_IOC_UNRESVSP64:
 881                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 882                         return -EFAULT;
 883
 884                 return ocfs2_change_file_space(filp, cmd, &sr);
 885         case OCFS2_IOC_GROUP_EXTEND:
 886                 if (!capable(CAP_SYS_RESOURCE))
 887                         return -EPERM;
 888
 889                 if (get_user(new_clusters, (int __user *)arg))
 890                         return -EFAULT;
 891
 892                 status = mnt_want_write_file(filp);
 893                 if (status)
 894                         return status;
 895                 status = ocfs2_group_extend(inode, new_clusters);
 896                 mnt_drop_write_file(filp);
 897                 return status;
 898         case OCFS2_IOC_GROUP_ADD:
 899         case OCFS2_IOC_GROUP_ADD64:
 900                 if (!capable(CAP_SYS_RESOURCE))
 901                         return -EPERM;
 902
 903                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 904                         return -EFAULT;
 905
 906                 status = mnt_want_write_file(filp);
 907                 if (status)
 908                         return status;
 909                 status = ocfs2_group_add(inode, &input);
 910                 mnt_drop_write_file(filp);
 911                 return status;
 912         case OCFS2_IOC_REFLINK:
 913                 if (copy_from_user(&args, argp, sizeof(args)))
 914                         return -EFAULT;
 915                 old_path = (const char __user *)(unsigned long)args.old_path;
 916                 new_path = (const char __user *)(unsigned long)args.new_path;
 917                 preserve = (args.preserve != 0);
 918
 919                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 920         case OCFS2_IOC_INFO:
 921                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 922                         return -EFAULT;
 923
 924                 return ocfs2_info_handle(inode, &info, 0);
 925         case FITRIM:
 926         {
 927                 struct super_block *sb = inode->i_sb;
 928                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 929                 struct fstrim_range range;
 930                 int ret = 0;
 931
 932                 if (!capable(CAP_SYS_ADMIN))
 933                         return -EPERM;
 934
 935                 if (!blk_queue_discard(q))
 936                         return -EOPNOTSUPP;
 937
 938                 if (copy_from_user(&range, argp, sizeof(range)))
 939                         return -EFAULT;
 940
 941                 range.minlen = max_t(u64, q->limits.discard_granularity,
 942                                      range.minlen);
 943                 ret = ocfs2_trim_fs(sb, &range);
 944                 if (ret < 0)
 945                         return ret;
 946
 947                 if (copy_to_user(argp, &range, sizeof(range)))
 948                         return -EFAULT;
 949
 950                 return 0;
 951         }
 952         case OCFS2_IOC_MOVE_EXT:
 953                 return ocfs2_ioctl_move_extents(filp, argp);
 954         default:
 955                 return -ENOTTY;
 956         }
 957 }
 958
 959 #ifdef CONFIG_COMPAT
 960 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 961 {
 962         bool preserve;
 963         struct reflink_arguments args;
 964         struct inode *inode = file_inode(file);
 965         struct ocfs2_info info;
 966         void __user *argp = (void __user *)arg;
 967
 968         switch (cmd) {
 969         case OCFS2_IOC32_GETFLAGS:
 970                 cmd = OCFS2_IOC_GETFLAGS;
 971                 break;
 972         case OCFS2_IOC32_SETFLAGS:
 973                 cmd = OCFS2_IOC_SETFLAGS;
 974                 break;
 975         case OCFS2_IOC_RESVSP:
 976         case OCFS2_IOC_RESVSP64:
 977         case OCFS2_IOC_UNRESVSP:
 978         case OCFS2_IOC_UNRESVSP64:
 979         case OCFS2_IOC_GROUP_EXTEND:
 980         case OCFS2_IOC_GROUP_ADD:
 981         case OCFS2_IOC_GROUP_ADD64:
 982                 break;
 983         case OCFS2_IOC_REFLINK:
 984                 if (copy_from_user(&args, argp, sizeof(args)))
 985                         return -EFAULT;
 986                 preserve = (args.preserve != 0);
 987
 988                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
 989                                            compat_ptr(args.new_path), preserve);
 990         case OCFS2_IOC_INFO:
 991                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 992                         return -EFAULT;
 993
 994                 return ocfs2_info_handle(inode, &info, 1);
 995         case OCFS2_IOC_MOVE_EXT:
 996                 break;
 997         default:
 998                 return -ENOIOCTLCMD;
 999         }
1000
1001         return ocfs2_ioctl(file, cmd, arg);
1002 }
1003 #endif