fs/ext4/ioctl.c

   1 /*
   2  * linux/fs/ext4/ioctl.c
   3  *
   4  * Copyright (C) 1993, 1994, 1995
   5  * Remy Card (card@masi.ibp.fr)
   6  * Laboratoire MASI - Institut Blaise Pascal
   7  * Universite Pierre et Marie Curie (Paris VI)
   8  */
   9
  10 #include <linux/fs.h>
  11 #include <linux/capability.h>
  12 #include <linux/time.h>
  13 #include <linux/compat.h>
  14 #include <linux/mount.h>
  15 #include <linux/file.h>
  16 #include <linux/quotaops.h>
  17 #include <linux/uuid.h>
  18 #include <linux/uaccess.h>
  19 #include <linux/delay.h>
  20 #include "ext4_jbd2.h"
  21 #include "ext4.h"
  22 #include <linux/fsmap.h>
  23 #include "fsmap.h"
  24 #include <trace/events/ext4.h>
  25
  26 /**
  27  * Swap memory between @a and @b for @len bytes.
  28  *
  29  * @a:          pointer to first memory area
  30  * @b:          pointer to second memory area
  31  * @len:        number of bytes to swap
  32  *
  33  */
  34 static void memswap(void *a, void *b, size_t len)
  35 {
  36         unsigned char *ap, *bp;
  37
  38         ap = (unsigned char *)a;
  39         bp = (unsigned char *)b;
  40         while (len-- > 0) {
  41                 swap(*ap, *bp);
  42                 ap++;
  43                 bp++;
  44         }
  45 }
  46
  47 /**
  48  * Swap i_data and associated attributes between @inode1 and @inode2.
  49  * This function is used for the primary swap between inode1 and inode2
  50  * and also to revert this primary swap in case of errors.
  51  *
  52  * Therefore you have to make sure, that calling this method twice
  53  * will revert all changes.
  54  *
  55  * @inode1:     pointer to first inode
  56  * @inode2:     pointer to second inode
  57  */
  58 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  59 {
  60         loff_t isize;
  61         struct ext4_inode_info *ei1;
  62         struct ext4_inode_info *ei2;
  63
  64         ei1 = EXT4_I(inode1);
  65         ei2 = EXT4_I(inode2);
  66
  67         memswap(&inode1->i_flags, &inode2->i_flags, sizeof(inode1->i_flags));
  68         memswap(&inode1->i_version, &inode2->i_version,
  69                   sizeof(inode1->i_version));
  70         memswap(&inode1->i_blocks, &inode2->i_blocks,
  71                   sizeof(inode1->i_blocks));
  72         memswap(&inode1->i_bytes, &inode2->i_bytes, sizeof(inode1->i_bytes));
  73         memswap(&inode1->i_atime, &inode2->i_atime, sizeof(inode1->i_atime));
  74         memswap(&inode1->i_mtime, &inode2->i_mtime, sizeof(inode1->i_mtime));
  75
  76         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  77         memswap(&ei1->i_flags, &ei2->i_flags, sizeof(ei1->i_flags));
  78         memswap(&ei1->i_disksize, &ei2->i_disksize, sizeof(ei1->i_disksize));
  79         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  80         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  81
  82         isize = i_size_read(inode1);
  83         i_size_write(inode1, i_size_read(inode2));
  84         i_size_write(inode2, isize);
  85 }
  86
  87 /**
  88  * Swap the information from the given @inode and the inode
  89  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  90  * important fields of the inodes.
  91  *
  92  * @sb:         the super block of the filesystem
  93  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  94  *
  95  */
  96 static long swap_inode_boot_loader(struct super_block *sb,
  97                                 struct inode *inode)
  98 {
  99         handle_t *handle;
 100         int err;
 101         struct inode *inode_bl;
 102         struct ext4_inode_info *ei_bl;
 103         struct ext4_sb_info *sbi = EXT4_SB(sb);
 104
 105         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 106                 return -EINVAL;
 107
 108         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 109                 return -EPERM;
 110
 111         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO);
 112         if (IS_ERR(inode_bl))
 113                 return PTR_ERR(inode_bl);
 114         ei_bl = EXT4_I(inode_bl);
 115
 116         filemap_flush(inode->i_mapping);
 117         filemap_flush(inode_bl->i_mapping);
 118
 119         /* Protect orig inodes against a truncate and make sure,
 120          * that only 1 swap_inode_boot_loader is running. */
 121         lock_two_nondirectories(inode, inode_bl);
 122
 123         truncate_inode_pages(&inode->i_data, 0);
 124         truncate_inode_pages(&inode_bl->i_data, 0);
 125
 126         /* Wait for all existing dio workers */
 127         ext4_inode_block_unlocked_dio(inode);
 128         ext4_inode_block_unlocked_dio(inode_bl);
 129         inode_dio_wait(inode);
 130         inode_dio_wait(inode_bl);
 131
 132         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 133         if (IS_ERR(handle)) {
 134                 err = -EINVAL;
 135                 goto journal_err_out;
 136         }
 137
 138         /* Protect extent tree against block allocations via delalloc */
 139         ext4_double_down_write_data_sem(inode, inode_bl);
 140
 141         if (inode_bl->i_nlink == 0) {
 142                 /* this inode has never been used as a BOOT_LOADER */
 143                 set_nlink(inode_bl, 1);
 144                 i_uid_write(inode_bl, 0);
 145                 i_gid_write(inode_bl, 0);
 146                 inode_bl->i_flags = 0;
 147                 ei_bl->i_flags = 0;
 148                 inode_bl->i_version = 1;
 149                 i_size_write(inode_bl, 0);
 150                 inode_bl->i_mode = S_IFREG;
 151                 if (ext4_has_feature_extents(sb)) {
 152                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 153                         ext4_ext_tree_init(handle, inode_bl);
 154                 } else
 155                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 156         }
 157
 158         swap_inode_data(inode, inode_bl);
 159
 160         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 161
 162         spin_lock(&sbi->s_next_gen_lock);
 163         inode->i_generation = sbi->s_next_generation++;
 164         inode_bl->i_generation = sbi->s_next_generation++;
 165         spin_unlock(&sbi->s_next_gen_lock);
 166
 167         ext4_discard_preallocations(inode);
 168
 169         err = ext4_mark_inode_dirty(handle, inode);
 170         if (err < 0) {
 171                 ext4_warning(inode->i_sb,
 172                         "couldn't mark inode #%lu dirty (err %d)",
 173                         inode->i_ino, err);
 174                 /* Revert all changes: */
 175                 swap_inode_data(inode, inode_bl);
 176         } else {
 177                 err = ext4_mark_inode_dirty(handle, inode_bl);
 178                 if (err < 0) {
 179                         ext4_warning(inode_bl->i_sb,
 180                                 "couldn't mark inode #%lu dirty (err %d)",
 181                                 inode_bl->i_ino, err);
 182                         /* Revert all changes: */
 183                         swap_inode_data(inode, inode_bl);
 184                         ext4_mark_inode_dirty(handle, inode);
 185                 }
 186         }
 187         ext4_journal_stop(handle);
 188         ext4_double_up_write_data_sem(inode, inode_bl);
 189
 190 journal_err_out:
 191         ext4_inode_resume_unlocked_dio(inode);
 192         ext4_inode_resume_unlocked_dio(inode_bl);
 193         unlock_two_nondirectories(inode, inode_bl);
 194         iput(inode_bl);
 195         return err;
 196 }
 197
 198 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 199 static int uuid_is_zero(__u8 u[16])
 200 {
 201         int     i;
 202
 203         for (i = 0; i < 16; i++)
 204                 if (u[i])
 205                         return 0;
 206         return 1;
 207 }
 208 #endif
 209
 210 static int ext4_ioctl_setflags(struct inode *inode,
 211                                unsigned int flags)
 212 {
 213         struct ext4_inode_info *ei = EXT4_I(inode);
 214         handle_t *handle = NULL;
 215         int err = -EPERM, migrate = 0;
 216         struct ext4_iloc iloc;
 217         unsigned int oldflags, mask, i;
 218         unsigned int jflag;
 219
 220         /* Is it quota file? Do not allow user to mess with it */
 221         if (IS_NOQUOTA(inode))
 222                 goto flags_out;
 223
 224         oldflags = ei->i_flags;
 225
 226         /* The JOURNAL_DATA flag is modifiable only by root */
 227         jflag = flags & EXT4_JOURNAL_DATA_FL;
 228
 229         /*
 230          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 231          * the relevant capability.
 232          *
 233          * This test looks nicer. Thanks to Pauline Middelink
 234          */
 235         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 236                 if (!capable(CAP_LINUX_IMMUTABLE))
 237                         goto flags_out;
 238         }
 239
 240         /*
 241          * The JOURNAL_DATA flag can only be changed by
 242          * the relevant capability.
 243          */
 244         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 245                 if (!capable(CAP_SYS_RESOURCE))
 246                         goto flags_out;
 247         }
 248         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 249                 migrate = 1;
 250
 251         if (flags & EXT4_EOFBLOCKS_FL) {
 252                 /* we don't support adding EOFBLOCKS flag */
 253                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 254                         err = -EOPNOTSUPP;
 255                         goto flags_out;
 256                 }
 257         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 258                 err = ext4_truncate(inode);
 259                 if (err)
 260                         goto flags_out;
 261         }
 262
 263         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 264         if (IS_ERR(handle)) {
 265                 err = PTR_ERR(handle);
 266                 goto flags_out;
 267         }
 268         if (IS_SYNC(inode))
 269                 ext4_handle_sync(handle);
 270         err = ext4_reserve_inode_write(handle, inode, &iloc);
 271         if (err)
 272                 goto flags_err;
 273
 274         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 275                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 276                         continue;
 277                 /* These flags get special treatment later */
 278                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 279                         continue;
 280                 if (mask & flags)
 281                         ext4_set_inode_flag(inode, i);
 282                 else
 283                         ext4_clear_inode_flag(inode, i);
 284         }
 285
 286         ext4_set_inode_flags(inode);
 287         inode->i_ctime = current_time(inode);
 288
 289         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 290 flags_err:
 291         ext4_journal_stop(handle);
 292         if (err)
 293                 goto flags_out;
 294
 295         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL))
 296                 err = ext4_change_inode_journal_flag(inode, jflag);
 297         if (err)
 298                 goto flags_out;
 299         if (migrate) {
 300                 if (flags & EXT4_EXTENTS_FL)
 301                         err = ext4_ext_migrate(inode);
 302                 else
 303                         err = ext4_ind_migrate(inode);
 304         }
 305
 306 flags_out:
 307         return err;
 308 }
 309
 310 #ifdef CONFIG_QUOTA
 311 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 312 {
 313         struct inode *inode = file_inode(filp);
 314         struct super_block *sb = inode->i_sb;
 315         struct ext4_inode_info *ei = EXT4_I(inode);
 316         int err, rc;
 317         handle_t *handle;
 318         kprojid_t kprojid;
 319         struct ext4_iloc iloc;
 320         struct ext4_inode *raw_inode;
 321         struct dquot *transfer_to[MAXQUOTAS] = { };
 322
 323         if (!ext4_has_feature_project(sb)) {
 324                 if (projid != EXT4_DEF_PROJID)
 325                         return -EOPNOTSUPP;
 326                 else
 327                         return 0;
 328         }
 329
 330         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 331                 return -EOPNOTSUPP;
 332
 333         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 334
 335         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 336                 return 0;
 337
 338         err = mnt_want_write_file(filp);
 339         if (err)
 340                 return err;
 341
 342         err = -EPERM;
 343         inode_lock(inode);
 344         /* Is it quota file? Do not allow user to mess with it */
 345         if (IS_NOQUOTA(inode))
 346                 goto out_unlock;
 347
 348         err = ext4_get_inode_loc(inode, &iloc);
 349         if (err)
 350                 goto out_unlock;
 351
 352         raw_inode = ext4_raw_inode(&iloc);
 353         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 354                 err = -EOVERFLOW;
 355                 brelse(iloc.bh);
 356                 goto out_unlock;
 357         }
 358         brelse(iloc.bh);
 359
 360         dquot_initialize(inode);
 361
 362         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 363                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 364                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 365         if (IS_ERR(handle)) {
 366                 err = PTR_ERR(handle);
 367                 goto out_unlock;
 368         }
 369
 370         err = ext4_reserve_inode_write(handle, inode, &iloc);
 371         if (err)
 372                 goto out_stop;
 373
 374         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 375         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 376                 err = __dquot_transfer(inode, transfer_to);
 377                 dqput(transfer_to[PRJQUOTA]);
 378                 if (err)
 379                         goto out_dirty;
 380         }
 381
 382         EXT4_I(inode)->i_projid = kprojid;
 383         inode->i_ctime = current_time(inode);
 384 out_dirty:
 385         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 386         if (!err)
 387                 err = rc;
 388 out_stop:
 389         ext4_journal_stop(handle);
 390 out_unlock:
 391         inode_unlock(inode);
 392         mnt_drop_write_file(filp);
 393         return err;
 394 }
 395 #else
 396 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 397 {
 398         if (projid != EXT4_DEF_PROJID)
 399                 return -EOPNOTSUPP;
 400         return 0;
 401 }
 402 #endif
 403
 404 /* Transfer internal flags to xflags */
 405 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 406 {
 407         __u32 xflags = 0;
 408
 409         if (iflags & EXT4_SYNC_FL)
 410                 xflags |= FS_XFLAG_SYNC;
 411         if (iflags & EXT4_IMMUTABLE_FL)
 412                 xflags |= FS_XFLAG_IMMUTABLE;
 413         if (iflags & EXT4_APPEND_FL)
 414                 xflags |= FS_XFLAG_APPEND;
 415         if (iflags & EXT4_NODUMP_FL)
 416                 xflags |= FS_XFLAG_NODUMP;
 417         if (iflags & EXT4_NOATIME_FL)
 418                 xflags |= FS_XFLAG_NOATIME;
 419         if (iflags & EXT4_PROJINHERIT_FL)
 420                 xflags |= FS_XFLAG_PROJINHERIT;
 421         return xflags;
 422 }
 423
 424 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 425                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 426                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 427
 428 /* Transfer xflags flags to internal */
 429 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 430 {
 431         unsigned long iflags = 0;
 432
 433         if (xflags & FS_XFLAG_SYNC)
 434                 iflags |= EXT4_SYNC_FL;
 435         if (xflags & FS_XFLAG_IMMUTABLE)
 436                 iflags |= EXT4_IMMUTABLE_FL;
 437         if (xflags & FS_XFLAG_APPEND)
 438                 iflags |= EXT4_APPEND_FL;
 439         if (xflags & FS_XFLAG_NODUMP)
 440                 iflags |= EXT4_NODUMP_FL;
 441         if (xflags & FS_XFLAG_NOATIME)
 442                 iflags |= EXT4_NOATIME_FL;
 443         if (xflags & FS_XFLAG_PROJINHERIT)
 444                 iflags |= EXT4_PROJINHERIT_FL;
 445
 446         return iflags;
 447 }
 448
 449 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 450 {
 451         struct ext4_sb_info *sbi = EXT4_SB(sb);
 452         __u32 flags;
 453
 454         if (!capable(CAP_SYS_ADMIN))
 455                 return -EPERM;
 456
 457         if (get_user(flags, (__u32 __user *)arg))
 458                 return -EFAULT;
 459
 460         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 461                 return -EINVAL;
 462
 463         if (ext4_forced_shutdown(sbi))
 464                 return 0;
 465
 466         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 467
 468         switch (flags) {
 469         case EXT4_GOING_FLAGS_DEFAULT:
 470                 freeze_bdev(sb->s_bdev);
 471                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 472                 thaw_bdev(sb->s_bdev, sb);
 473                 break;
 474         case EXT4_GOING_FLAGS_LOGFLUSH:
 475                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 476                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 477                         (void) ext4_force_commit(sb);
 478                         jbd2_journal_abort(sbi->s_journal, 0);
 479                 }
 480                 break;
 481         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 482                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 483                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 484                         msleep(100);
 485                         jbd2_journal_abort(sbi->s_journal, 0);
 486                 }
 487                 break;
 488         default:
 489                 return -EINVAL;
 490         }
 491         clear_opt(sb, DISCARD);
 492         return 0;
 493 }
 494
 495 struct getfsmap_info {
 496         struct super_block      *gi_sb;
 497         struct fsmap_head __user *gi_data;
 498         unsigned int            gi_idx;
 499         __u32                   gi_last_flags;
 500 };
 501
 502 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 503 {
 504         struct getfsmap_info *info = priv;
 505         struct fsmap fm;
 506
 507         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 508
 509         info->gi_last_flags = xfm->fmr_flags;
 510         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 511         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 512                         sizeof(struct fsmap)))
 513                 return -EFAULT;
 514
 515         return 0;
 516 }
 517
 518 static int ext4_ioc_getfsmap(struct super_block *sb,
 519                              struct fsmap_head __user *arg)
 520 {
 521         struct getfsmap_info info = {0};
 522         struct ext4_fsmap_head xhead = {0};
 523         struct fsmap_head head;
 524         bool aborted = false;
 525         int error;
 526
 527         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 528                 return -EFAULT;
 529         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 530             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 531                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 532             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 533                        sizeof(head.fmh_keys[1].fmr_reserved)))
 534                 return -EINVAL;
 535         /*
 536          * ext4 doesn't report file extents at all, so the only valid
 537          * file offsets are the magic ones (all zeroes or all ones).
 538          */
 539         if (head.fmh_keys[0].fmr_offset ||
 540             (head.fmh_keys[1].fmr_offset != 0 &&
 541              head.fmh_keys[1].fmr_offset != -1ULL))
 542                 return -EINVAL;
 543
 544         xhead.fmh_iflags = head.fmh_iflags;
 545         xhead.fmh_count = head.fmh_count;
 546         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 547         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 548
 549         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 550         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 551
 552         info.gi_sb = sb;
 553         info.gi_data = arg;
 554         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 555         if (error == EXT4_QUERY_RANGE_ABORT) {
 556                 error = 0;
 557                 aborted = true;
 558         } else if (error)
 559                 return error;
 560
 561         /* If we didn't abort, set the "last" flag in the last fmx */
 562         if (!aborted && info.gi_idx) {
 563                 info.gi_last_flags |= FMR_OF_LAST;
 564                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 565                                  &info.gi_last_flags,
 566                                  sizeof(info.gi_last_flags)))
 567                         return -EFAULT;
 568         }
 569
 570         /* copy back header */
 571         head.fmh_entries = xhead.fmh_entries;
 572         head.fmh_oflags = xhead.fmh_oflags;
 573         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 574                 return -EFAULT;
 575
 576         return 0;
 577 }
 578
 579 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 580 {
 581         struct inode *inode = file_inode(filp);
 582         struct super_block *sb = inode->i_sb;
 583         struct ext4_inode_info *ei = EXT4_I(inode);
 584         unsigned int flags;
 585
 586         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 587
 588         switch (cmd) {
 589         case FS_IOC_GETFSMAP:
 590                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 591         case EXT4_IOC_GETFLAGS:
 592                 ext4_get_inode_flags(ei);
 593                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 594                 return put_user(flags, (int __user *) arg);
 595         case EXT4_IOC_SETFLAGS: {
 596                 int err;
 597
 598                 if (!inode_owner_or_capable(inode))
 599                         return -EACCES;
 600
 601                 if (get_user(flags, (int __user *) arg))
 602                         return -EFAULT;
 603
 604                 if (flags & ~EXT4_FL_USER_VISIBLE)
 605                         return -EOPNOTSUPP;
 606                 /*
 607                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 608                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 609                  * more restrictive than just silently masking off visible but
 610                  * not settable flags as we always did.
 611                  */
 612                 flags &= EXT4_FL_USER_MODIFIABLE;
 613                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 614                         return -EOPNOTSUPP;
 615
 616                 err = mnt_want_write_file(filp);
 617                 if (err)
 618                         return err;
 619
 620                 inode_lock(inode);
 621                 err = ext4_ioctl_setflags(inode, flags);
 622                 inode_unlock(inode);
 623                 mnt_drop_write_file(filp);
 624                 return err;
 625         }
 626         case EXT4_IOC_GETVERSION:
 627         case EXT4_IOC_GETVERSION_OLD:
 628                 return put_user(inode->i_generation, (int __user *) arg);
 629         case EXT4_IOC_SETVERSION:
 630         case EXT4_IOC_SETVERSION_OLD: {
 631                 handle_t *handle;
 632                 struct ext4_iloc iloc;
 633                 __u32 generation;
 634                 int err;
 635
 636                 if (!inode_owner_or_capable(inode))
 637                         return -EPERM;
 638
 639                 if (ext4_has_metadata_csum(inode->i_sb)) {
 640                         ext4_warning(sb, "Setting inode version is not "
 641                                      "supported with metadata_csum enabled.");
 642                         return -ENOTTY;
 643                 }
 644
 645                 err = mnt_want_write_file(filp);
 646                 if (err)
 647                         return err;
 648                 if (get_user(generation, (int __user *) arg)) {
 649                         err = -EFAULT;
 650                         goto setversion_out;
 651                 }
 652
 653                 inode_lock(inode);
 654                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 655                 if (IS_ERR(handle)) {
 656                         err = PTR_ERR(handle);
 657                         goto unlock_out;
 658                 }
 659                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 660                 if (err == 0) {
 661                         inode->i_ctime = current_time(inode);
 662                         inode->i_generation = generation;
 663                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 664                 }
 665                 ext4_journal_stop(handle);
 666
 667 unlock_out:
 668                 inode_unlock(inode);
 669 setversion_out:
 670                 mnt_drop_write_file(filp);
 671                 return err;
 672         }
 673         case EXT4_IOC_GROUP_EXTEND: {
 674                 ext4_fsblk_t n_blocks_count;
 675                 int err, err2=0;
 676
 677                 err = ext4_resize_begin(sb);
 678                 if (err)
 679                         return err;
 680
 681                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 682                         err = -EFAULT;
 683                         goto group_extend_out;
 684                 }
 685
 686                 if (ext4_has_feature_bigalloc(sb)) {
 687                         ext4_msg(sb, KERN_ERR,
 688                                  "Online resizing not supported with bigalloc");
 689                         err = -EOPNOTSUPP;
 690                         goto group_extend_out;
 691                 }
 692
 693                 err = mnt_want_write_file(filp);
 694                 if (err)
 695                         goto group_extend_out;
 696
 697                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 698                 if (EXT4_SB(sb)->s_journal) {
 699                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 700                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 701                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 702                 }
 703                 if (err == 0)
 704                         err = err2;
 705                 mnt_drop_write_file(filp);
 706 group_extend_out:
 707                 ext4_resize_end(sb);
 708                 return err;
 709         }
 710
 711         case EXT4_IOC_MOVE_EXT: {
 712                 struct move_extent me;
 713                 struct fd donor;
 714                 int err;
 715
 716                 if (!(filp->f_mode & FMODE_READ) ||
 717                     !(filp->f_mode & FMODE_WRITE))
 718                         return -EBADF;
 719
 720                 if (copy_from_user(&me,
 721                         (struct move_extent __user *)arg, sizeof(me)))
 722                         return -EFAULT;
 723                 me.moved_len = 0;
 724
 725                 donor = fdget(me.donor_fd);
 726                 if (!donor.file)
 727                         return -EBADF;
 728
 729                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 730                         err = -EBADF;
 731                         goto mext_out;
 732                 }
 733
 734                 if (ext4_has_feature_bigalloc(sb)) {
 735                         ext4_msg(sb, KERN_ERR,
 736                                  "Online defrag not supported with bigalloc");
 737                         err = -EOPNOTSUPP;
 738                         goto mext_out;
 739                 } else if (IS_DAX(inode)) {
 740                         ext4_msg(sb, KERN_ERR,
 741                                  "Online defrag not supported with DAX");
 742                         err = -EOPNOTSUPP;
 743                         goto mext_out;
 744                 }
 745
 746                 err = mnt_want_write_file(filp);
 747                 if (err)
 748                         goto mext_out;
 749
 750                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 751                                         me.donor_start, me.len, &me.moved_len);
 752                 mnt_drop_write_file(filp);
 753
 754                 if (copy_to_user((struct move_extent __user *)arg,
 755                                  &me, sizeof(me)))
 756                         err = -EFAULT;
 757 mext_out:
 758                 fdput(donor);
 759                 return err;
 760         }
 761
 762         case EXT4_IOC_GROUP_ADD: {
 763                 struct ext4_new_group_data input;
 764                 int err, err2=0;
 765
 766                 err = ext4_resize_begin(sb);
 767                 if (err)
 768                         return err;
 769
 770                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 771                                 sizeof(input))) {
 772                         err = -EFAULT;
 773                         goto group_add_out;
 774                 }
 775
 776                 if (ext4_has_feature_bigalloc(sb)) {
 777                         ext4_msg(sb, KERN_ERR,
 778                                  "Online resizing not supported with bigalloc");
 779                         err = -EOPNOTSUPP;
 780                         goto group_add_out;
 781                 }
 782
 783                 err = mnt_want_write_file(filp);
 784                 if (err)
 785                         goto group_add_out;
 786
 787                 err = ext4_group_add(sb, &input);
 788                 if (EXT4_SB(sb)->s_journal) {
 789                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 790                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 791                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 792                 }
 793                 if (err == 0)
 794                         err = err2;
 795                 mnt_drop_write_file(filp);
 796                 if (!err && ext4_has_group_desc_csum(sb) &&
 797                     test_opt(sb, INIT_INODE_TABLE))
 798                         err = ext4_register_li_request(sb, input.group);
 799 group_add_out:
 800                 ext4_resize_end(sb);
 801                 return err;
 802         }
 803
 804         case EXT4_IOC_MIGRATE:
 805         {
 806                 int err;
 807                 if (!inode_owner_or_capable(inode))
 808                         return -EACCES;
 809
 810                 err = mnt_want_write_file(filp);
 811                 if (err)
 812                         return err;
 813                 /*
 814                  * inode_mutex prevent write and truncate on the file.
 815                  * Read still goes through. We take i_data_sem in
 816                  * ext4_ext_swap_inode_data before we switch the
 817                  * inode format to prevent read.
 818                  */
 819                 inode_lock((inode));
 820                 err = ext4_ext_migrate(inode);
 821                 inode_unlock((inode));
 822                 mnt_drop_write_file(filp);
 823                 return err;
 824         }
 825
 826         case EXT4_IOC_ALLOC_DA_BLKS:
 827         {
 828                 int err;
 829                 if (!inode_owner_or_capable(inode))
 830                         return -EACCES;
 831
 832                 err = mnt_want_write_file(filp);
 833                 if (err)
 834                         return err;
 835                 err = ext4_alloc_da_blocks(inode);
 836                 mnt_drop_write_file(filp);
 837                 return err;
 838         }
 839
 840         case EXT4_IOC_SWAP_BOOT:
 841         {
 842                 int err;
 843                 if (!(filp->f_mode & FMODE_WRITE))
 844                         return -EBADF;
 845                 err = mnt_want_write_file(filp);
 846                 if (err)
 847                         return err;
 848                 err = swap_inode_boot_loader(sb, inode);
 849                 mnt_drop_write_file(filp);
 850                 return err;
 851         }
 852
 853         case EXT4_IOC_RESIZE_FS: {
 854                 ext4_fsblk_t n_blocks_count;
 855                 int err = 0, err2 = 0;
 856                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 857
 858                 if (ext4_has_feature_bigalloc(sb)) {
 859                         ext4_msg(sb, KERN_ERR,
 860                                  "Online resizing not (yet) supported with bigalloc");
 861                         return -EOPNOTSUPP;
 862                 }
 863
 864                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 865                                    sizeof(__u64))) {
 866                         return -EFAULT;
 867                 }
 868
 869                 err = ext4_resize_begin(sb);
 870                 if (err)
 871                         return err;
 872
 873                 err = mnt_want_write_file(filp);
 874                 if (err)
 875                         goto resizefs_out;
 876
 877                 err = ext4_resize_fs(sb, n_blocks_count);
 878                 if (EXT4_SB(sb)->s_journal) {
 879                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 880                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 881                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 882                 }
 883                 if (err == 0)
 884                         err = err2;
 885                 mnt_drop_write_file(filp);
 886                 if (!err && (o_group > EXT4_SB(sb)->s_groups_count) &&
 887                     ext4_has_group_desc_csum(sb) &&
 888                     test_opt(sb, INIT_INODE_TABLE))
 889                         err = ext4_register_li_request(sb, o_group);
 890
 891 resizefs_out:
 892                 ext4_resize_end(sb);
 893                 return err;
 894         }
 895
 896         case FITRIM:
 897         {
 898                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 899                 struct fstrim_range range;
 900                 int ret = 0;
 901
 902                 if (!capable(CAP_SYS_ADMIN))
 903                         return -EPERM;
 904
 905                 if (!blk_queue_discard(q))
 906                         return -EOPNOTSUPP;
 907
 908                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 909                     sizeof(range)))
 910                         return -EFAULT;
 911
 912                 range.minlen = max((unsigned int)range.minlen,
 913                                    q->limits.discard_granularity);
 914                 ret = ext4_trim_fs(sb, &range);
 915                 if (ret < 0)
 916                         return ret;
 917
 918                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
 919                     sizeof(range)))
 920                         return -EFAULT;
 921
 922                 return 0;
 923         }
 924         case EXT4_IOC_PRECACHE_EXTENTS:
 925                 return ext4_ext_precache(inode);
 926
 927         case EXT4_IOC_SET_ENCRYPTION_POLICY:
 928                 if (!ext4_has_feature_encrypt(sb))
 929                         return -EOPNOTSUPP;
 930                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
 931
 932         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
 933 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 934                 int err, err2;
 935                 struct ext4_sb_info *sbi = EXT4_SB(sb);
 936                 handle_t *handle;
 937
 938                 if (!ext4_has_feature_encrypt(sb))
 939                         return -EOPNOTSUPP;
 940                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
 941                         err = mnt_want_write_file(filp);
 942                         if (err)
 943                                 return err;
 944                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
 945                         if (IS_ERR(handle)) {
 946                                 err = PTR_ERR(handle);
 947                                 goto pwsalt_err_exit;
 948                         }
 949                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
 950                         if (err)
 951                                 goto pwsalt_err_journal;
 952                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
 953                         err = ext4_handle_dirty_metadata(handle, NULL,
 954                                                          sbi->s_sbh);
 955                 pwsalt_err_journal:
 956                         err2 = ext4_journal_stop(handle);
 957                         if (err2 && !err)
 958                                 err = err2;
 959                 pwsalt_err_exit:
 960                         mnt_drop_write_file(filp);
 961                         if (err)
 962                                 return err;
 963                 }
 964                 if (copy_to_user((void __user *) arg,
 965                                  sbi->s_es->s_encrypt_pw_salt, 16))
 966                         return -EFAULT;
 967                 return 0;
 968 #else
 969                 return -EOPNOTSUPP;
 970 #endif
 971         }
 972         case EXT4_IOC_GET_ENCRYPTION_POLICY:
 973                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
 974
 975         case EXT4_IOC_FSGETXATTR:
 976         {
 977                 struct fsxattr fa;
 978
 979                 memset(&fa, 0, sizeof(struct fsxattr));
 980                 ext4_get_inode_flags(ei);
 981                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
 982
 983                 if (ext4_has_feature_project(inode->i_sb)) {
 984                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
 985                                 EXT4_I(inode)->i_projid);
 986                 }
 987
 988                 if (copy_to_user((struct fsxattr __user *)arg,
 989                                  &fa, sizeof(fa)))
 990                         return -EFAULT;
 991                 return 0;
 992         }
 993         case EXT4_IOC_FSSETXATTR:
 994         {
 995                 struct fsxattr fa;
 996                 int err;
 997
 998                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
 999                                    sizeof(fa)))
1000                         return -EFAULT;
1001
1002                 /* Make sure caller has proper permission */
1003                 if (!inode_owner_or_capable(inode))
1004                         return -EACCES;
1005
1006                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1007                         return -EOPNOTSUPP;
1008
1009                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1010                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1011                         return -EOPNOTSUPP;
1012
1013                 err = mnt_want_write_file(filp);
1014                 if (err)
1015                         return err;
1016
1017                 inode_lock(inode);
1018                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1019                          (flags & EXT4_FL_XFLAG_VISIBLE);
1020                 err = ext4_ioctl_setflags(inode, flags);
1021                 inode_unlock(inode);
1022                 mnt_drop_write_file(filp);
1023                 if (err)
1024                         return err;
1025
1026                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1027                 if (err)
1028                         return err;
1029
1030                 return 0;
1031         }
1032         case EXT4_IOC_SHUTDOWN:
1033                 return ext4_shutdown(sb, arg);
1034         default:
1035                 return -ENOTTY;
1036         }
1037 }
1038
1039 #ifdef CONFIG_COMPAT
1040 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1041 {
1042         /* These are just misnamed, they actually get/put from/to user an int */
1043         switch (cmd) {
1044         case EXT4_IOC32_GETFLAGS:
1045                 cmd = EXT4_IOC_GETFLAGS;
1046                 break;
1047         case EXT4_IOC32_SETFLAGS:
1048                 cmd = EXT4_IOC_SETFLAGS;
1049                 break;
1050         case EXT4_IOC32_GETVERSION:
1051                 cmd = EXT4_IOC_GETVERSION;
1052                 break;
1053         case EXT4_IOC32_SETVERSION:
1054                 cmd = EXT4_IOC_SETVERSION;
1055                 break;
1056         case EXT4_IOC32_GROUP_EXTEND:
1057                 cmd = EXT4_IOC_GROUP_EXTEND;
1058                 break;
1059         case EXT4_IOC32_GETVERSION_OLD:
1060                 cmd = EXT4_IOC_GETVERSION_OLD;
1061                 break;
1062         case EXT4_IOC32_SETVERSION_OLD:
1063                 cmd = EXT4_IOC_SETVERSION_OLD;
1064                 break;
1065         case EXT4_IOC32_GETRSVSZ:
1066                 cmd = EXT4_IOC_GETRSVSZ;
1067                 break;
1068         case EXT4_IOC32_SETRSVSZ:
1069                 cmd = EXT4_IOC_SETRSVSZ;
1070                 break;
1071         case EXT4_IOC32_GROUP_ADD: {
1072                 struct compat_ext4_new_group_input __user *uinput;
1073                 struct ext4_new_group_input input;
1074                 mm_segment_t old_fs;
1075                 int err;
1076
1077                 uinput = compat_ptr(arg);
1078                 err = get_user(input.group, &uinput->group);
1079                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1080                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1081                 err |= get_user(input.inode_table, &uinput->inode_table);
1082                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1083                 err |= get_user(input.reserved_blocks,
1084                                 &uinput->reserved_blocks);
1085                 if (err)
1086                         return -EFAULT;
1087                 old_fs = get_fs();
1088                 set_fs(KERNEL_DS);
1089                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
1090                                  (unsigned long) &input);
1091                 set_fs(old_fs);
1092                 return err;
1093         }
1094         case EXT4_IOC_MOVE_EXT:
1095         case EXT4_IOC_RESIZE_FS:
1096         case EXT4_IOC_PRECACHE_EXTENTS:
1097         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1098         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1099         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1100         case EXT4_IOC_SHUTDOWN:
1101         case FS_IOC_GETFSMAP:
1102                 break;
1103         default:
1104                 return -ENOIOCTLCMD;
1105         }
1106         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1107 }
1108 #endif