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 #include <linux/fileattr.h>
  14
  15 #include <cluster/masklog.h>
  16
  17 #include "ocfs2.h"
  18 #include "alloc.h"
  19 #include "dlmglue.h"
  20 #include "file.h"
  21 #include "inode.h"
  22 #include "journal.h"
  23
  24 #include "ocfs2_fs.h"
  25 #include "ioctl.h"
  26 #include "resize.h"
  27 #include "refcounttree.h"
  28 #include "sysfile.h"
  29 #include "dir.h"
  30 #include "buffer_head_io.h"
  31 #include "suballoc.h"
  32 #include "move_extents.h"
  33
  34 #define o2info_from_user(a, b)  \
  35                 copy_from_user(&(a), (b), sizeof(a))
  36 #define o2info_to_user(a, b)    \
  37                 copy_to_user((typeof(a) __user *)b, &(a), sizeof(a))
  38
  39 /*
  40  * This is just a best-effort to tell userspace that this request
  41  * 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 int ocfs2_fileattr_get(struct dentry *dentry, struct fileattr *fa)
  66 {
  67         struct inode *inode = d_inode(dentry);
  68         unsigned int flags;
  69         int status;
  70
  71         status = ocfs2_inode_lock(inode, NULL, 0);
  72         if (status < 0) {
  73                 mlog_errno(status);
  74                 return status;
  75         }
  76         ocfs2_get_inode_flags(OCFS2_I(inode));
  77         flags = OCFS2_I(inode)->ip_attr;
  78         ocfs2_inode_unlock(inode, 0);
  79
  80         fileattr_fill_flags(fa, flags & OCFS2_FL_VISIBLE);
  81
  82         return status;
  83 }
  84
  85 int ocfs2_fileattr_set(struct mnt_idmap *idmap,
  86                        struct dentry *dentry, struct fileattr *fa)
  87 {
  88         struct inode *inode = d_inode(dentry);
  89         unsigned int flags = fa->flags;
  90         struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
  91         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
  92         handle_t *handle = NULL;
  93         struct buffer_head *bh = NULL;
  94         unsigned oldflags;
  95         int status;
  96
  97         if (fileattr_has_fsx(fa))
  98                 return -EOPNOTSUPP;
  99
 100         status = ocfs2_inode_lock(inode, &bh, 1);
 101         if (status < 0) {
 102                 mlog_errno(status);
 103                 goto bail;
 104         }
 105
 106         if (!S_ISDIR(inode->i_mode))
 107                 flags &= ~OCFS2_DIRSYNC_FL;
 108
 109         oldflags = ocfs2_inode->ip_attr;
 110         flags = flags & OCFS2_FL_MODIFIABLE;
 111         flags |= oldflags & ~OCFS2_FL_MODIFIABLE;
 112
 113         /* Check already done by VFS, but repeat with ocfs lock */
 114         status = -EPERM;
 115         if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) &&
 116             !capable(CAP_LINUX_IMMUTABLE))
 117                 goto bail_unlock;
 118
 119         handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
 120         if (IS_ERR(handle)) {
 121                 status = PTR_ERR(handle);
 122                 mlog_errno(status);
 123                 goto bail_unlock;
 124         }
 125
 126         ocfs2_inode->ip_attr = flags;
 127         ocfs2_set_inode_flags(inode);
 128
 129         status = ocfs2_mark_inode_dirty(handle, inode, bh);
 130         if (status < 0)
 131                 mlog_errno(status);
 132
 133         ocfs2_commit_trans(osb, handle);
 134
 135 bail_unlock:
 136         ocfs2_inode_unlock(inode, 1);
 137 bail:
 138         brelse(bh);
 139
 140         return status;
 141 }
 142
 143 static int ocfs2_info_handle_blocksize(struct inode *inode,
 144                                        struct ocfs2_info_request __user *req)
 145 {
 146         struct ocfs2_info_blocksize oib;
 147
 148         if (o2info_from_user(oib, req))
 149                 return -EFAULT;
 150
 151         oib.ib_blocksize = inode->i_sb->s_blocksize;
 152
 153         o2info_set_request_filled(&oib.ib_req);
 154
 155         if (o2info_to_user(oib, req))
 156                 return -EFAULT;
 157
 158         return 0;
 159 }
 160
 161 static int ocfs2_info_handle_clustersize(struct inode *inode,
 162                                          struct ocfs2_info_request __user *req)
 163 {
 164         struct ocfs2_info_clustersize oic;
 165         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 166
 167         if (o2info_from_user(oic, req))
 168                 return -EFAULT;
 169
 170         oic.ic_clustersize = osb->s_clustersize;
 171
 172         o2info_set_request_filled(&oic.ic_req);
 173
 174         if (o2info_to_user(oic, req))
 175                 return -EFAULT;
 176
 177         return 0;
 178 }
 179
 180 static int ocfs2_info_handle_maxslots(struct inode *inode,
 181                                       struct ocfs2_info_request __user *req)
 182 {
 183         struct ocfs2_info_maxslots oim;
 184         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 185
 186         if (o2info_from_user(oim, req))
 187                 return -EFAULT;
 188
 189         oim.im_max_slots = osb->max_slots;
 190
 191         o2info_set_request_filled(&oim.im_req);
 192
 193         if (o2info_to_user(oim, req))
 194                 return -EFAULT;
 195
 196         return 0;
 197 }
 198
 199 static int ocfs2_info_handle_label(struct inode *inode,
 200                                    struct ocfs2_info_request __user *req)
 201 {
 202         struct ocfs2_info_label oil;
 203         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 204
 205         if (o2info_from_user(oil, req))
 206                 return -EFAULT;
 207
 208         memcpy(oil.il_label, osb->vol_label, OCFS2_MAX_VOL_LABEL_LEN);
 209
 210         o2info_set_request_filled(&oil.il_req);
 211
 212         if (o2info_to_user(oil, req))
 213                 return -EFAULT;
 214
 215         return 0;
 216 }
 217
 218 static int ocfs2_info_handle_uuid(struct inode *inode,
 219                                   struct ocfs2_info_request __user *req)
 220 {
 221         struct ocfs2_info_uuid oiu;
 222         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 223
 224         if (o2info_from_user(oiu, req))
 225                 return -EFAULT;
 226
 227         memcpy(oiu.iu_uuid_str, osb->uuid_str, OCFS2_TEXT_UUID_LEN + 1);
 228
 229         o2info_set_request_filled(&oiu.iu_req);
 230
 231         if (o2info_to_user(oiu, req))
 232                 return -EFAULT;
 233
 234         return 0;
 235 }
 236
 237 static int ocfs2_info_handle_fs_features(struct inode *inode,
 238                                          struct ocfs2_info_request __user *req)
 239 {
 240         struct ocfs2_info_fs_features oif;
 241         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 242
 243         if (o2info_from_user(oif, req))
 244                 return -EFAULT;
 245
 246         oif.if_compat_features = osb->s_feature_compat;
 247         oif.if_incompat_features = osb->s_feature_incompat;
 248         oif.if_ro_compat_features = osb->s_feature_ro_compat;
 249
 250         o2info_set_request_filled(&oif.if_req);
 251
 252         if (o2info_to_user(oif, req))
 253                 return -EFAULT;
 254
 255         return 0;
 256 }
 257
 258 static int ocfs2_info_handle_journal_size(struct inode *inode,
 259                                           struct ocfs2_info_request __user *req)
 260 {
 261         struct ocfs2_info_journal_size oij;
 262         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 263
 264         if (o2info_from_user(oij, req))
 265                 return -EFAULT;
 266
 267         oij.ij_journal_size = i_size_read(osb->journal->j_inode);
 268
 269         o2info_set_request_filled(&oij.ij_req);
 270
 271         if (o2info_to_user(oij, req))
 272                 return -EFAULT;
 273
 274         return 0;
 275 }
 276
 277 static int ocfs2_info_scan_inode_alloc(struct ocfs2_super *osb,
 278                                        struct inode *inode_alloc, u64 blkno,
 279                                        struct ocfs2_info_freeinode *fi,
 280                                        u32 slot)
 281 {
 282         int status = 0, unlock = 0;
 283
 284         struct buffer_head *bh = NULL;
 285         struct ocfs2_dinode *dinode_alloc = NULL;
 286
 287         if (inode_alloc)
 288                 inode_lock(inode_alloc);
 289
 290         if (inode_alloc && o2info_coherent(&fi->ifi_req)) {
 291                 status = ocfs2_inode_lock(inode_alloc, &bh, 0);
 292                 if (status < 0) {
 293                         mlog_errno(status);
 294                         goto bail;
 295                 }
 296                 unlock = 1;
 297         } else {
 298                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 299                 if (status < 0) {
 300                         mlog_errno(status);
 301                         goto bail;
 302                 }
 303         }
 304
 305         dinode_alloc = (struct ocfs2_dinode *)bh->b_data;
 306
 307         fi->ifi_stat[slot].lfi_total =
 308                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total);
 309         fi->ifi_stat[slot].lfi_free =
 310                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_total) -
 311                 le32_to_cpu(dinode_alloc->id1.bitmap1.i_used);
 312
 313 bail:
 314         if (unlock)
 315                 ocfs2_inode_unlock(inode_alloc, 0);
 316
 317         if (inode_alloc)
 318                 inode_unlock(inode_alloc);
 319
 320         brelse(bh);
 321
 322         return status;
 323 }
 324
 325 static int ocfs2_info_handle_freeinode(struct inode *inode,
 326                                        struct ocfs2_info_request __user *req)
 327 {
 328         u32 i;
 329         u64 blkno = -1;
 330         char namebuf[40];
 331         int status, type = INODE_ALLOC_SYSTEM_INODE;
 332         struct ocfs2_info_freeinode *oifi = NULL;
 333         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 334         struct inode *inode_alloc = NULL;
 335
 336         oifi = kzalloc(sizeof(struct ocfs2_info_freeinode), GFP_KERNEL);
 337         if (!oifi) {
 338                 status = -ENOMEM;
 339                 mlog_errno(status);
 340                 goto out_err;
 341         }
 342
 343         if (o2info_from_user(*oifi, req)) {
 344                 status = -EFAULT;
 345                 goto out_free;
 346         }
 347
 348         oifi->ifi_slotnum = osb->max_slots;
 349
 350         for (i = 0; i < oifi->ifi_slotnum; i++) {
 351                 if (o2info_coherent(&oifi->ifi_req)) {
 352                         inode_alloc = ocfs2_get_system_file_inode(osb, type, i);
 353                         if (!inode_alloc) {
 354                                 mlog(ML_ERROR, "unable to get alloc inode in "
 355                                     "slot %u\n", i);
 356                                 status = -EIO;
 357                                 goto bail;
 358                         }
 359                 } else {
 360                         ocfs2_sprintf_system_inode_name(namebuf,
 361                                                         sizeof(namebuf),
 362                                                         type, i);
 363                         status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 364                                                             namebuf,
 365                                                             strlen(namebuf),
 366                                                             &blkno);
 367                         if (status < 0) {
 368                                 status = -ENOENT;
 369                                 goto bail;
 370                         }
 371                 }
 372
 373                 status = ocfs2_info_scan_inode_alloc(osb, inode_alloc, blkno, oifi, i);
 374
 375                 iput(inode_alloc);
 376                 inode_alloc = NULL;
 377
 378                 if (status < 0)
 379                         goto bail;
 380         }
 381
 382         o2info_set_request_filled(&oifi->ifi_req);
 383
 384         if (o2info_to_user(*oifi, req)) {
 385                 status = -EFAULT;
 386                 goto out_free;
 387         }
 388
 389         status = 0;
 390 bail:
 391         if (status)
 392                 o2info_set_request_error(&oifi->ifi_req, req);
 393 out_free:
 394         kfree(oifi);
 395 out_err:
 396         return status;
 397 }
 398
 399 static void o2ffg_update_histogram(struct ocfs2_info_free_chunk_list *hist,
 400                                    unsigned int chunksize)
 401 {
 402         u32 index;
 403
 404         index = __ilog2_u32(chunksize);
 405         if (index >= OCFS2_INFO_MAX_HIST)
 406                 index = OCFS2_INFO_MAX_HIST - 1;
 407
 408         hist->fc_chunks[index]++;
 409         hist->fc_clusters[index] += chunksize;
 410 }
 411
 412 static void o2ffg_update_stats(struct ocfs2_info_freefrag_stats *stats,
 413                                unsigned int chunksize)
 414 {
 415         if (chunksize > stats->ffs_max)
 416                 stats->ffs_max = chunksize;
 417
 418         if (chunksize < stats->ffs_min)
 419                 stats->ffs_min = chunksize;
 420
 421         stats->ffs_avg += chunksize;
 422         stats->ffs_free_chunks_real++;
 423 }
 424
 425 static void ocfs2_info_update_ffg(struct ocfs2_info_freefrag *ffg,
 426                                   unsigned int chunksize)
 427 {
 428         o2ffg_update_histogram(&(ffg->iff_ffs.ffs_fc_hist), chunksize);
 429         o2ffg_update_stats(&(ffg->iff_ffs), chunksize);
 430 }
 431
 432 static int ocfs2_info_freefrag_scan_chain(struct ocfs2_super *osb,
 433                                           struct inode *gb_inode,
 434                                           struct ocfs2_dinode *gb_dinode,
 435                                           struct ocfs2_chain_rec *rec,
 436                                           struct ocfs2_info_freefrag *ffg,
 437                                           u32 chunks_in_group)
 438 {
 439         int status = 0, used;
 440         u64 blkno;
 441
 442         struct buffer_head *bh = NULL;
 443         struct ocfs2_group_desc *bg = NULL;
 444
 445         unsigned int max_bits, num_clusters;
 446         unsigned int offset = 0, cluster, chunk;
 447         unsigned int chunk_free, last_chunksize = 0;
 448
 449         if (!le32_to_cpu(rec->c_free))
 450                 goto bail;
 451
 452         do {
 453                 if (!bg)
 454                         blkno = le64_to_cpu(rec->c_blkno);
 455                 else
 456                         blkno = le64_to_cpu(bg->bg_next_group);
 457
 458                 if (bh) {
 459                         brelse(bh);
 460                         bh = NULL;
 461                 }
 462
 463                 if (o2info_coherent(&ffg->iff_req))
 464                         status = ocfs2_read_group_descriptor(gb_inode,
 465                                                              gb_dinode,
 466                                                              blkno, &bh);
 467                 else
 468                         status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 469
 470                 if (status < 0) {
 471                         mlog(ML_ERROR, "Can't read the group descriptor # "
 472                              "%llu from device.", (unsigned long long)blkno);
 473                         status = -EIO;
 474                         goto bail;
 475                 }
 476
 477                 bg = (struct ocfs2_group_desc *)bh->b_data;
 478
 479                 if (!le16_to_cpu(bg->bg_free_bits_count))
 480                         continue;
 481
 482                 max_bits = le16_to_cpu(bg->bg_bits);
 483                 offset = 0;
 484
 485                 for (chunk = 0; chunk < chunks_in_group; chunk++) {
 486                         /*
 487                          * last chunk may be not an entire one.
 488                          */
 489                         if ((offset + ffg->iff_chunksize) > max_bits)
 490                                 num_clusters = max_bits - offset;
 491                         else
 492                                 num_clusters = ffg->iff_chunksize;
 493
 494                         chunk_free = 0;
 495                         for (cluster = 0; cluster < num_clusters; cluster++) {
 496                                 used = ocfs2_test_bit(offset,
 497                                                 (unsigned long *)bg->bg_bitmap);
 498                                 /*
 499                                  * - chunk_free counts free clusters in #N chunk.
 500                                  * - last_chunksize records the size(in) clusters
 501                                  *   for the last real free chunk being counted.
 502                                  */
 503                                 if (!used) {
 504                                         last_chunksize++;
 505                                         chunk_free++;
 506                                 }
 507
 508                                 if (used && last_chunksize) {
 509                                         ocfs2_info_update_ffg(ffg,
 510                                                               last_chunksize);
 511                                         last_chunksize = 0;
 512                                 }
 513
 514                                 offset++;
 515                         }
 516
 517                         if (chunk_free == ffg->iff_chunksize)
 518                                 ffg->iff_ffs.ffs_free_chunks++;
 519                 }
 520
 521                 /*
 522                  * need to update the info for last free chunk.
 523                  */
 524                 if (last_chunksize)
 525                         ocfs2_info_update_ffg(ffg, last_chunksize);
 526
 527         } while (le64_to_cpu(bg->bg_next_group));
 528
 529 bail:
 530         brelse(bh);
 531
 532         return status;
 533 }
 534
 535 static int ocfs2_info_freefrag_scan_bitmap(struct ocfs2_super *osb,
 536                                            struct inode *gb_inode, u64 blkno,
 537                                            struct ocfs2_info_freefrag *ffg)
 538 {
 539         u32 chunks_in_group;
 540         int status = 0, unlock = 0, i;
 541
 542         struct buffer_head *bh = NULL;
 543         struct ocfs2_chain_list *cl = NULL;
 544         struct ocfs2_chain_rec *rec = NULL;
 545         struct ocfs2_dinode *gb_dinode = NULL;
 546
 547         if (gb_inode)
 548                 inode_lock(gb_inode);
 549
 550         if (o2info_coherent(&ffg->iff_req)) {
 551                 status = ocfs2_inode_lock(gb_inode, &bh, 0);
 552                 if (status < 0) {
 553                         mlog_errno(status);
 554                         goto bail;
 555                 }
 556                 unlock = 1;
 557         } else {
 558                 status = ocfs2_read_blocks_sync(osb, blkno, 1, &bh);
 559                 if (status < 0) {
 560                         mlog_errno(status);
 561                         goto bail;
 562                 }
 563         }
 564
 565         gb_dinode = (struct ocfs2_dinode *)bh->b_data;
 566         cl = &(gb_dinode->id2.i_chain);
 567
 568         /*
 569          * Chunksize(in) clusters from userspace should be
 570          * less than clusters in a group.
 571          */
 572         if (ffg->iff_chunksize > le16_to_cpu(cl->cl_cpg)) {
 573                 status = -EINVAL;
 574                 goto bail;
 575         }
 576
 577         memset(&ffg->iff_ffs, 0, sizeof(struct ocfs2_info_freefrag_stats));
 578
 579         ffg->iff_ffs.ffs_min = ~0U;
 580         ffg->iff_ffs.ffs_clusters =
 581                         le32_to_cpu(gb_dinode->id1.bitmap1.i_total);
 582         ffg->iff_ffs.ffs_free_clusters = ffg->iff_ffs.ffs_clusters -
 583                         le32_to_cpu(gb_dinode->id1.bitmap1.i_used);
 584
 585         chunks_in_group = le16_to_cpu(cl->cl_cpg) / ffg->iff_chunksize + 1;
 586
 587         for (i = 0; i < le16_to_cpu(cl->cl_next_free_rec); i++) {
 588                 rec = &(cl->cl_recs[i]);
 589                 status = ocfs2_info_freefrag_scan_chain(osb, gb_inode,
 590                                                         gb_dinode,
 591                                                         rec, ffg,
 592                                                         chunks_in_group);
 593                 if (status)
 594                         goto bail;
 595         }
 596
 597         if (ffg->iff_ffs.ffs_free_chunks_real)
 598                 ffg->iff_ffs.ffs_avg = (ffg->iff_ffs.ffs_avg /
 599                                         ffg->iff_ffs.ffs_free_chunks_real);
 600 bail:
 601         if (unlock)
 602                 ocfs2_inode_unlock(gb_inode, 0);
 603
 604         if (gb_inode)
 605                 inode_unlock(gb_inode);
 606
 607         iput(gb_inode);
 608         brelse(bh);
 609
 610         return status;
 611 }
 612
 613 static int ocfs2_info_handle_freefrag(struct inode *inode,
 614                                       struct ocfs2_info_request __user *req)
 615 {
 616         u64 blkno = -1;
 617         char namebuf[40];
 618         int status, type = GLOBAL_BITMAP_SYSTEM_INODE;
 619
 620         struct ocfs2_info_freefrag *oiff;
 621         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
 622         struct inode *gb_inode = NULL;
 623
 624         oiff = kzalloc(sizeof(struct ocfs2_info_freefrag), GFP_KERNEL);
 625         if (!oiff) {
 626                 status = -ENOMEM;
 627                 mlog_errno(status);
 628                 goto out_err;
 629         }
 630
 631         if (o2info_from_user(*oiff, req)) {
 632                 status = -EFAULT;
 633                 goto out_free;
 634         }
 635         /*
 636          * chunksize from userspace should be power of 2.
 637          */
 638         if ((oiff->iff_chunksize & (oiff->iff_chunksize - 1)) ||
 639             (!oiff->iff_chunksize)) {
 640                 status = -EINVAL;
 641                 goto bail;
 642         }
 643
 644         if (o2info_coherent(&oiff->iff_req)) {
 645                 gb_inode = ocfs2_get_system_file_inode(osb, type,
 646                                                        OCFS2_INVALID_SLOT);
 647                 if (!gb_inode) {
 648                         mlog(ML_ERROR, "unable to get global_bitmap inode\n");
 649                         status = -EIO;
 650                         goto bail;
 651                 }
 652         } else {
 653                 ocfs2_sprintf_system_inode_name(namebuf, sizeof(namebuf), type,
 654                                                 OCFS2_INVALID_SLOT);
 655                 status = ocfs2_lookup_ino_from_name(osb->sys_root_inode,
 656                                                     namebuf,
 657                                                     strlen(namebuf),
 658                                                     &blkno);
 659                 if (status < 0) {
 660                         status = -ENOENT;
 661                         goto bail;
 662                 }
 663         }
 664
 665         status = ocfs2_info_freefrag_scan_bitmap(osb, gb_inode, blkno, oiff);
 666         if (status < 0)
 667                 goto bail;
 668
 669         o2info_set_request_filled(&oiff->iff_req);
 670
 671         if (o2info_to_user(*oiff, req)) {
 672                 status = -EFAULT;
 673                 goto out_free;
 674         }
 675
 676         status = 0;
 677 bail:
 678         if (status)
 679                 o2info_set_request_error(&oiff->iff_req, req);
 680 out_free:
 681         kfree(oiff);
 682 out_err:
 683         return status;
 684 }
 685
 686 static int ocfs2_info_handle_unknown(struct inode *inode,
 687                                      struct ocfs2_info_request __user *req)
 688 {
 689         struct ocfs2_info_request oir;
 690
 691         if (o2info_from_user(oir, req))
 692                 return -EFAULT;
 693
 694         o2info_clear_request_filled(&oir);
 695
 696         if (o2info_to_user(oir, req))
 697                 return -EFAULT;
 698
 699         return 0;
 700 }
 701
 702 /*
 703  * Validate and distinguish OCFS2_IOC_INFO requests.
 704  *
 705  * - validate the magic number.
 706  * - distinguish different requests.
 707  * - validate size of different requests.
 708  */
 709 static int ocfs2_info_handle_request(struct inode *inode,
 710                                      struct ocfs2_info_request __user *req)
 711 {
 712         int status = -EFAULT;
 713         struct ocfs2_info_request oir;
 714
 715         if (o2info_from_user(oir, req))
 716                 goto bail;
 717
 718         status = -EINVAL;
 719         if (oir.ir_magic != OCFS2_INFO_MAGIC)
 720                 goto bail;
 721
 722         switch (oir.ir_code) {
 723         case OCFS2_INFO_BLOCKSIZE:
 724                 if (oir.ir_size == sizeof(struct ocfs2_info_blocksize))
 725                         status = ocfs2_info_handle_blocksize(inode, req);
 726                 break;
 727         case OCFS2_INFO_CLUSTERSIZE:
 728                 if (oir.ir_size == sizeof(struct ocfs2_info_clustersize))
 729                         status = ocfs2_info_handle_clustersize(inode, req);
 730                 break;
 731         case OCFS2_INFO_MAXSLOTS:
 732                 if (oir.ir_size == sizeof(struct ocfs2_info_maxslots))
 733                         status = ocfs2_info_handle_maxslots(inode, req);
 734                 break;
 735         case OCFS2_INFO_LABEL:
 736                 if (oir.ir_size == sizeof(struct ocfs2_info_label))
 737                         status = ocfs2_info_handle_label(inode, req);
 738                 break;
 739         case OCFS2_INFO_UUID:
 740                 if (oir.ir_size == sizeof(struct ocfs2_info_uuid))
 741                         status = ocfs2_info_handle_uuid(inode, req);
 742                 break;
 743         case OCFS2_INFO_FS_FEATURES:
 744                 if (oir.ir_size == sizeof(struct ocfs2_info_fs_features))
 745                         status = ocfs2_info_handle_fs_features(inode, req);
 746                 break;
 747         case OCFS2_INFO_JOURNAL_SIZE:
 748                 if (oir.ir_size == sizeof(struct ocfs2_info_journal_size))
 749                         status = ocfs2_info_handle_journal_size(inode, req);
 750                 break;
 751         case OCFS2_INFO_FREEINODE:
 752                 if (oir.ir_size == sizeof(struct ocfs2_info_freeinode))
 753                         status = ocfs2_info_handle_freeinode(inode, req);
 754                 break;
 755         case OCFS2_INFO_FREEFRAG:
 756                 if (oir.ir_size == sizeof(struct ocfs2_info_freefrag))
 757                         status = ocfs2_info_handle_freefrag(inode, req);
 758                 break;
 759         default:
 760                 status = ocfs2_info_handle_unknown(inode, req);
 761                 break;
 762         }
 763
 764 bail:
 765         return status;
 766 }
 767
 768 static int ocfs2_get_request_ptr(struct ocfs2_info *info, int idx,
 769                                  u64 *req_addr, int compat_flag)
 770 {
 771         int status = -EFAULT;
 772         u64 __user *bp = NULL;
 773
 774         if (compat_flag) {
 775 #ifdef CONFIG_COMPAT
 776                 /*
 777                  * pointer bp stores the base address of a pointers array,
 778                  * which collects all addresses of separate request.
 779                  */
 780                 bp = (u64 __user *)(unsigned long)compat_ptr(info->oi_requests);
 781 #else
 782                 BUG();
 783 #endif
 784         } else
 785                 bp = (u64 __user *)(unsigned long)(info->oi_requests);
 786
 787         if (o2info_from_user(*req_addr, bp + idx))
 788                 goto bail;
 789
 790         status = 0;
 791 bail:
 792         return status;
 793 }
 794
 795 /*
 796  * OCFS2_IOC_INFO handles an array of requests passed from userspace.
 797  *
 798  * ocfs2_info_handle() recevies a large info aggregation, grab and
 799  * validate the request count from header, then break it into small
 800  * pieces, later specific handlers can handle them one by one.
 801  *
 802  * Idea here is to make each separate request small enough to ensure
 803  * a better backward&forward compatibility, since a small piece of
 804  * request will be less likely to be broken if disk layout get changed.
 805  */
 806 static noinline_for_stack int
 807 ocfs2_info_handle(struct inode *inode, struct ocfs2_info *info, int compat_flag)
 808 {
 809         int i, status = 0;
 810         u64 req_addr;
 811         struct ocfs2_info_request __user *reqp;
 812
 813         if ((info->oi_count > OCFS2_INFO_MAX_REQUEST) ||
 814             (!info->oi_requests)) {
 815                 status = -EINVAL;
 816                 goto bail;
 817         }
 818
 819         for (i = 0; i < info->oi_count; i++) {
 820
 821                 status = ocfs2_get_request_ptr(info, i, &req_addr, compat_flag);
 822                 if (status)
 823                         break;
 824
 825                 reqp = (struct ocfs2_info_request __user *)(unsigned long)req_addr;
 826                 if (!reqp) {
 827                         status = -EINVAL;
 828                         goto bail;
 829                 }
 830
 831                 status = ocfs2_info_handle_request(inode, reqp);
 832                 if (status)
 833                         break;
 834         }
 835
 836 bail:
 837         return status;
 838 }
 839
 840 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 841 {
 842         struct inode *inode = file_inode(filp);
 843         void __user *argp = (void __user *)arg;
 844         int status;
 845
 846         switch (cmd) {
 847         case OCFS2_IOC_RESVSP:
 848         case OCFS2_IOC_RESVSP64:
 849         case OCFS2_IOC_UNRESVSP:
 850         case OCFS2_IOC_UNRESVSP64:
 851         {
 852                 struct ocfs2_space_resv sr;
 853
 854                 if (copy_from_user(&sr, (int __user *) arg, sizeof(sr)))
 855                         return -EFAULT;
 856
 857                 return ocfs2_change_file_space(filp, cmd, &sr);
 858         }
 859         case OCFS2_IOC_GROUP_EXTEND:
 860         {
 861                 int new_clusters;
 862
 863                 if (!capable(CAP_SYS_RESOURCE))
 864                         return -EPERM;
 865
 866                 if (get_user(new_clusters, (int __user *)arg))
 867                         return -EFAULT;
 868
 869                 status = mnt_want_write_file(filp);
 870                 if (status)
 871                         return status;
 872                 status = ocfs2_group_extend(inode, new_clusters);
 873                 mnt_drop_write_file(filp);
 874                 return status;
 875         }
 876         case OCFS2_IOC_GROUP_ADD:
 877         case OCFS2_IOC_GROUP_ADD64:
 878         {
 879                 struct ocfs2_new_group_input input;
 880
 881                 if (!capable(CAP_SYS_RESOURCE))
 882                         return -EPERM;
 883
 884                 if (copy_from_user(&input, (int __user *) arg, sizeof(input)))
 885                         return -EFAULT;
 886
 887                 status = mnt_want_write_file(filp);
 888                 if (status)
 889                         return status;
 890                 status = ocfs2_group_add(inode, &input);
 891                 mnt_drop_write_file(filp);
 892                 return status;
 893         }
 894         case OCFS2_IOC_REFLINK:
 895         {
 896                 struct reflink_arguments args;
 897                 const char __user *old_path;
 898                 const char __user *new_path;
 899                 bool preserve;
 900
 901                 if (copy_from_user(&args, argp, sizeof(args)))
 902                         return -EFAULT;
 903                 old_path = (const char __user *)(unsigned long)args.old_path;
 904                 new_path = (const char __user *)(unsigned long)args.new_path;
 905                 preserve = (args.preserve != 0);
 906
 907                 return ocfs2_reflink_ioctl(inode, old_path, new_path, preserve);
 908         }
 909         case OCFS2_IOC_INFO:
 910         {
 911                 struct ocfs2_info info;
 912
 913                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 914                         return -EFAULT;
 915
 916                 return ocfs2_info_handle(inode, &info, 0);
 917         }
 918         case FITRIM:
 919         {
 920                 struct super_block *sb = inode->i_sb;
 921                 struct fstrim_range range;
 922                 int ret = 0;
 923
 924                 if (!capable(CAP_SYS_ADMIN))
 925                         return -EPERM;
 926
 927                 if (!bdev_max_discard_sectors(sb->s_bdev))
 928                         return -EOPNOTSUPP;
 929
 930                 if (copy_from_user(&range, argp, sizeof(range)))
 931                         return -EFAULT;
 932
 933                 range.minlen = max_t(u64, bdev_discard_granularity(sb->s_bdev),
 934                                      range.minlen);
 935                 ret = ocfs2_trim_fs(sb, &range);
 936                 if (ret < 0)
 937                         return ret;
 938
 939                 if (copy_to_user(argp, &range, sizeof(range)))
 940                         return -EFAULT;
 941
 942                 return 0;
 943         }
 944         case OCFS2_IOC_MOVE_EXT:
 945                 return ocfs2_ioctl_move_extents(filp, argp);
 946         default:
 947                 return -ENOTTY;
 948         }
 949 }
 950
 951 #ifdef CONFIG_COMPAT
 952 long ocfs2_compat_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 953 {
 954         bool preserve;
 955         struct reflink_arguments args;
 956         struct inode *inode = file_inode(file);
 957         struct ocfs2_info info;
 958         void __user *argp = (void __user *)arg;
 959
 960         switch (cmd) {
 961         case OCFS2_IOC_RESVSP:
 962         case OCFS2_IOC_RESVSP64:
 963         case OCFS2_IOC_UNRESVSP:
 964         case OCFS2_IOC_UNRESVSP64:
 965         case OCFS2_IOC_GROUP_EXTEND:
 966         case OCFS2_IOC_GROUP_ADD:
 967         case OCFS2_IOC_GROUP_ADD64:
 968                 break;
 969         case OCFS2_IOC_REFLINK:
 970                 if (copy_from_user(&args, argp, sizeof(args)))
 971                         return -EFAULT;
 972                 preserve = (args.preserve != 0);
 973
 974                 return ocfs2_reflink_ioctl(inode, compat_ptr(args.old_path),
 975                                            compat_ptr(args.new_path), preserve);
 976         case OCFS2_IOC_INFO:
 977                 if (copy_from_user(&info, argp, sizeof(struct ocfs2_info)))
 978                         return -EFAULT;
 979
 980                 return ocfs2_info_handle(inode, &info, 1);
 981         case FITRIM:
 982         case OCFS2_IOC_MOVE_EXT:
 983                 break;
 984         default:
 985                 return -ENOIOCTLCMD;
 986         }
 987
 988         return ocfs2_ioctl(file, cmd, arg);
 989 }
 990 #endif