fs/ext4/ioctl.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext4/ioctl.c
   4  *
   5  * Copyright (C) 1993, 1994, 1995
   6  * Remy Card (card@masi.ibp.fr)
   7  * Laboratoire MASI - Institut Blaise Pascal
   8  * Universite Pierre et Marie Curie (Paris VI)
   9  */
  10
  11 #include <linux/fs.h>
  12 #include <linux/capability.h>
  13 #include <linux/time.h>
  14 #include <linux/compat.h>
  15 #include <linux/mount.h>
  16 #include <linux/file.h>
  17 #include <linux/quotaops.h>
  18 #include <linux/uuid.h>
  19 #include <linux/uaccess.h>
  20 #include <linux/delay.h>
  21 #include "ext4_jbd2.h"
  22 #include "ext4.h"
  23 #include <linux/fsmap.h>
  24 #include "fsmap.h"
  25 #include <trace/events/ext4.h>
  26
  27 /**
  28  * Swap memory between @a and @b for @len bytes.
  29  *
  30  * @a:          pointer to first memory area
  31  * @b:          pointer to second memory area
  32  * @len:        number of bytes to swap
  33  *
  34  */
  35 static void memswap(void *a, void *b, size_t len)
  36 {
  37         unsigned char *ap, *bp;
  38
  39         ap = (unsigned char *)a;
  40         bp = (unsigned char *)b;
  41         while (len-- > 0) {
  42                 swap(*ap, *bp);
  43                 ap++;
  44                 bp++;
  45         }
  46 }
  47
  48 /**
  49  * Swap i_data and associated attributes between @inode1 and @inode2.
  50  * This function is used for the primary swap between inode1 and inode2
  51  * and also to revert this primary swap in case of errors.
  52  *
  53  * Therefore you have to make sure, that calling this method twice
  54  * will revert all changes.
  55  *
  56  * @inode1:     pointer to first inode
  57  * @inode2:     pointer to second inode
  58  */
  59 static void swap_inode_data(struct inode *inode1, struct inode *inode2)
  60 {
  61         loff_t isize;
  62         struct ext4_inode_info *ei1;
  63         struct ext4_inode_info *ei2;
  64         unsigned long tmp;
  65
  66         ei1 = EXT4_I(inode1);
  67         ei2 = EXT4_I(inode2);
  68
  69         swap(inode1->i_flags, inode2->i_flags);
  70         swap(inode1->i_version, inode2->i_version);
  71         swap(inode1->i_blocks, inode2->i_blocks);
  72         swap(inode1->i_bytes, inode2->i_bytes);
  73         swap(inode1->i_atime, inode2->i_atime);
  74         swap(inode1->i_mtime, inode2->i_mtime);
  75
  76         memswap(ei1->i_data, ei2->i_data, sizeof(ei1->i_data));
  77         tmp = ei1->i_flags & EXT4_FL_SHOULD_SWAP;
  78         ei1->i_flags = (ei2->i_flags & EXT4_FL_SHOULD_SWAP) |
  79                 (ei1->i_flags & ~EXT4_FL_SHOULD_SWAP);
  80         ei2->i_flags = tmp | (ei2->i_flags & ~EXT4_FL_SHOULD_SWAP);
  81         swap(ei1->i_disksize, ei2->i_disksize);
  82         ext4_es_remove_extent(inode1, 0, EXT_MAX_BLOCKS);
  83         ext4_es_remove_extent(inode2, 0, EXT_MAX_BLOCKS);
  84
  85         isize = i_size_read(inode1);
  86         i_size_write(inode1, i_size_read(inode2));
  87         i_size_write(inode2, isize);
  88 }
  89
  90 /**
  91  * Swap the information from the given @inode and the inode
  92  * EXT4_BOOT_LOADER_INO. It will basically swap i_data and all other
  93  * important fields of the inodes.
  94  *
  95  * @sb:         the super block of the filesystem
  96  * @inode:      the inode to swap with EXT4_BOOT_LOADER_INO
  97  *
  98  */
  99 static long swap_inode_boot_loader(struct super_block *sb,
 100                                 struct inode *inode)
 101 {
 102         handle_t *handle;
 103         int err;
 104         struct inode *inode_bl;
 105         struct ext4_inode_info *ei_bl;
 106         struct ext4_sb_info *sbi = EXT4_SB(sb);
 107
 108         if (inode->i_nlink != 1 || !S_ISREG(inode->i_mode))
 109                 return -EINVAL;
 110
 111         if (!inode_owner_or_capable(inode) || !capable(CAP_SYS_ADMIN))
 112                 return -EPERM;
 113
 114         inode_bl = ext4_iget(sb, EXT4_BOOT_LOADER_INO, EXT4_IGET_SPECIAL);
 115         if (IS_ERR(inode_bl))
 116                 return PTR_ERR(inode_bl);
 117         ei_bl = EXT4_I(inode_bl);
 118
 119         filemap_flush(inode->i_mapping);
 120         filemap_flush(inode_bl->i_mapping);
 121
 122         /* Protect orig inodes against a truncate and make sure,
 123          * that only 1 swap_inode_boot_loader is running. */
 124         lock_two_nondirectories(inode, inode_bl);
 125
 126         truncate_inode_pages(&inode->i_data, 0);
 127         truncate_inode_pages(&inode_bl->i_data, 0);
 128
 129         /* Wait for all existing dio workers */
 130         ext4_inode_block_unlocked_dio(inode);
 131         ext4_inode_block_unlocked_dio(inode_bl);
 132         inode_dio_wait(inode);
 133         inode_dio_wait(inode_bl);
 134
 135         handle = ext4_journal_start(inode_bl, EXT4_HT_MOVE_EXTENTS, 2);
 136         if (IS_ERR(handle)) {
 137                 err = -EINVAL;
 138                 goto journal_err_out;
 139         }
 140
 141         /* Protect extent tree against block allocations via delalloc */
 142         ext4_double_down_write_data_sem(inode, inode_bl);
 143
 144         if (is_bad_inode(inode_bl) || !S_ISREG(inode_bl->i_mode)) {
 145                 /* this inode has never been used as a BOOT_LOADER */
 146                 set_nlink(inode_bl, 1);
 147                 i_uid_write(inode_bl, 0);
 148                 i_gid_write(inode_bl, 0);
 149                 inode_bl->i_flags = 0;
 150                 ei_bl->i_flags = 0;
 151                 inode_bl->i_version = 1;
 152                 i_size_write(inode_bl, 0);
 153                 EXT4_I(inode_bl)->i_disksize = inode_bl->i_size;
 154                 inode_bl->i_mode = S_IFREG;
 155                 if (ext4_has_feature_extents(sb)) {
 156                         ext4_set_inode_flag(inode_bl, EXT4_INODE_EXTENTS);
 157                         ext4_ext_tree_init(handle, inode_bl);
 158                 } else
 159                         memset(ei_bl->i_data, 0, sizeof(ei_bl->i_data));
 160         }
 161
 162         swap_inode_data(inode, inode_bl);
 163
 164         inode->i_ctime = inode_bl->i_ctime = current_time(inode);
 165
 166         spin_lock(&sbi->s_next_gen_lock);
 167         inode->i_generation = sbi->s_next_generation++;
 168         inode_bl->i_generation = sbi->s_next_generation++;
 169         spin_unlock(&sbi->s_next_gen_lock);
 170
 171         ext4_discard_preallocations(inode);
 172
 173         err = ext4_mark_inode_dirty(handle, inode);
 174         if (err < 0) {
 175                 ext4_warning(inode->i_sb,
 176                         "couldn't mark inode #%lu dirty (err %d)",
 177                         inode->i_ino, err);
 178                 /* Revert all changes: */
 179                 swap_inode_data(inode, inode_bl);
 180         } else {
 181                 err = ext4_mark_inode_dirty(handle, inode_bl);
 182                 if (err < 0) {
 183                         ext4_warning(inode_bl->i_sb,
 184                                 "couldn't mark inode #%lu dirty (err %d)",
 185                                 inode_bl->i_ino, err);
 186                         /* Revert all changes: */
 187                         swap_inode_data(inode, inode_bl);
 188                         ext4_mark_inode_dirty(handle, inode);
 189                 }
 190         }
 191         ext4_journal_stop(handle);
 192         ext4_double_up_write_data_sem(inode, inode_bl);
 193
 194 journal_err_out:
 195         ext4_inode_resume_unlocked_dio(inode);
 196         ext4_inode_resume_unlocked_dio(inode_bl);
 197         unlock_two_nondirectories(inode, inode_bl);
 198         iput(inode_bl);
 199         return err;
 200 }
 201
 202 #ifdef CONFIG_EXT4_FS_ENCRYPTION
 203 static int uuid_is_zero(__u8 u[16])
 204 {
 205         int     i;
 206
 207         for (i = 0; i < 16; i++)
 208                 if (u[i])
 209                         return 0;
 210         return 1;
 211 }
 212 #endif
 213
 214 /*
 215  * If immutable is set and we are not clearing it, we're not allowed to change
 216  * anything else in the inode.  Don't error out if we're only trying to set
 217  * immutable on an immutable file.
 218  */
 219 static int ext4_ioctl_check_immutable(struct inode *inode, __u32 new_projid,
 220                                       unsigned int flags)
 221 {
 222         struct ext4_inode_info *ei = EXT4_I(inode);
 223         unsigned int oldflags = ei->i_flags;
 224
 225         if (!(oldflags & EXT4_IMMUTABLE_FL) || !(flags & EXT4_IMMUTABLE_FL))
 226                 return 0;
 227
 228         if ((oldflags & ~EXT4_IMMUTABLE_FL) != (flags & ~EXT4_IMMUTABLE_FL))
 229                 return -EPERM;
 230         if (ext4_has_feature_project(inode->i_sb) &&
 231             __kprojid_val(ei->i_projid) != new_projid)
 232                 return -EPERM;
 233
 234         return 0;
 235 }
 236
 237 static int ext4_ioctl_setflags(struct inode *inode,
 238                                unsigned int flags)
 239 {
 240         struct ext4_inode_info *ei = EXT4_I(inode);
 241         handle_t *handle = NULL;
 242         int err = -EPERM, migrate = 0;
 243         struct ext4_iloc iloc;
 244         unsigned int oldflags, mask, i;
 245         unsigned int jflag;
 246
 247         /* Is it quota file? Do not allow user to mess with it */
 248         if (ext4_is_quota_file(inode))
 249                 goto flags_out;
 250
 251         oldflags = ei->i_flags;
 252
 253         /* The JOURNAL_DATA flag is modifiable only by root */
 254         jflag = flags & EXT4_JOURNAL_DATA_FL;
 255
 256         /*
 257          * The IMMUTABLE and APPEND_ONLY flags can only be changed by
 258          * the relevant capability.
 259          *
 260          * This test looks nicer. Thanks to Pauline Middelink
 261          */
 262         if ((flags ^ oldflags) & (EXT4_APPEND_FL | EXT4_IMMUTABLE_FL)) {
 263                 if (!capable(CAP_LINUX_IMMUTABLE))
 264                         goto flags_out;
 265         }
 266
 267         /*
 268          * The JOURNAL_DATA flag can only be changed by
 269          * the relevant capability.
 270          */
 271         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 272                 if (!capable(CAP_SYS_RESOURCE))
 273                         goto flags_out;
 274         }
 275         if ((flags ^ oldflags) & EXT4_EXTENTS_FL)
 276                 migrate = 1;
 277
 278         if (flags & EXT4_EOFBLOCKS_FL) {
 279                 /* we don't support adding EOFBLOCKS flag */
 280                 if (!(oldflags & EXT4_EOFBLOCKS_FL)) {
 281                         err = -EOPNOTSUPP;
 282                         goto flags_out;
 283                 }
 284         } else if (oldflags & EXT4_EOFBLOCKS_FL) {
 285                 err = ext4_truncate(inode);
 286                 if (err)
 287                         goto flags_out;
 288         }
 289
 290         /*
 291          * Wait for all pending directio and then flush all the dirty pages
 292          * for this file.  The flush marks all the pages readonly, so any
 293          * subsequent attempt to write to the file (particularly mmap pages)
 294          * will come through the filesystem and fail.
 295          */
 296         if (S_ISREG(inode->i_mode) && !IS_IMMUTABLE(inode) &&
 297             (flags & EXT4_IMMUTABLE_FL)) {
 298                 inode_dio_wait(inode);
 299                 err = filemap_write_and_wait(inode->i_mapping);
 300                 if (err)
 301                         goto flags_out;
 302         }
 303
 304         handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 305         if (IS_ERR(handle)) {
 306                 err = PTR_ERR(handle);
 307                 goto flags_out;
 308         }
 309         if (IS_SYNC(inode))
 310                 ext4_handle_sync(handle);
 311         err = ext4_reserve_inode_write(handle, inode, &iloc);
 312         if (err)
 313                 goto flags_err;
 314
 315         for (i = 0, mask = 1; i < 32; i++, mask <<= 1) {
 316                 if (!(mask & EXT4_FL_USER_MODIFIABLE))
 317                         continue;
 318                 /* These flags get special treatment later */
 319                 if (mask == EXT4_JOURNAL_DATA_FL || mask == EXT4_EXTENTS_FL)
 320                         continue;
 321                 if (mask & flags)
 322                         ext4_set_inode_flag(inode, i);
 323                 else
 324                         ext4_clear_inode_flag(inode, i);
 325         }
 326
 327         ext4_set_inode_flags(inode);
 328         inode->i_ctime = current_time(inode);
 329
 330         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 331 flags_err:
 332         ext4_journal_stop(handle);
 333         if (err)
 334                 goto flags_out;
 335
 336         if ((jflag ^ oldflags) & (EXT4_JOURNAL_DATA_FL)) {
 337                 /*
 338                  * Changes to the journaling mode can cause unsafe changes to
 339                  * S_DAX if we are using the DAX mount option.
 340                  */
 341                 if (test_opt(inode->i_sb, DAX)) {
 342                         err = -EBUSY;
 343                         goto flags_out;
 344                 }
 345
 346                 err = ext4_change_inode_journal_flag(inode, jflag);
 347                 if (err)
 348                         goto flags_out;
 349         }
 350         if (migrate) {
 351                 if (flags & EXT4_EXTENTS_FL)
 352                         err = ext4_ext_migrate(inode);
 353                 else
 354                         err = ext4_ind_migrate(inode);
 355         }
 356
 357 flags_out:
 358         return err;
 359 }
 360
 361 #ifdef CONFIG_QUOTA
 362 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 363 {
 364         struct inode *inode = file_inode(filp);
 365         struct super_block *sb = inode->i_sb;
 366         struct ext4_inode_info *ei = EXT4_I(inode);
 367         int err, rc;
 368         handle_t *handle;
 369         kprojid_t kprojid;
 370         struct ext4_iloc iloc;
 371         struct ext4_inode *raw_inode;
 372         struct dquot *transfer_to[MAXQUOTAS] = { };
 373
 374         if (!ext4_has_feature_project(sb)) {
 375                 if (projid != EXT4_DEF_PROJID)
 376                         return -EOPNOTSUPP;
 377                 else
 378                         return 0;
 379         }
 380
 381         if (EXT4_INODE_SIZE(sb) <= EXT4_GOOD_OLD_INODE_SIZE)
 382                 return -EOPNOTSUPP;
 383
 384         kprojid = make_kprojid(&init_user_ns, (projid_t)projid);
 385
 386         if (projid_eq(kprojid, EXT4_I(inode)->i_projid))
 387                 return 0;
 388
 389         err = -EPERM;
 390         /* Is it quota file? Do not allow user to mess with it */
 391         if (ext4_is_quota_file(inode))
 392                 return err;
 393
 394         err = dquot_initialize(inode);
 395         if (err)
 396                 return err;
 397
 398         err = ext4_get_inode_loc(inode, &iloc);
 399         if (err)
 400                 return err;
 401
 402         raw_inode = ext4_raw_inode(&iloc);
 403         if (!EXT4_FITS_IN_INODE(raw_inode, ei, i_projid)) {
 404                 err = ext4_expand_extra_isize(inode,
 405                                               EXT4_SB(sb)->s_want_extra_isize,
 406                                               &iloc);
 407                 if (err)
 408                         return err;
 409         } else {
 410                 brelse(iloc.bh);
 411         }
 412
 413         handle = ext4_journal_start(inode, EXT4_HT_QUOTA,
 414                 EXT4_QUOTA_INIT_BLOCKS(sb) +
 415                 EXT4_QUOTA_DEL_BLOCKS(sb) + 3);
 416         if (IS_ERR(handle))
 417                 return PTR_ERR(handle);
 418
 419         err = ext4_reserve_inode_write(handle, inode, &iloc);
 420         if (err)
 421                 goto out_stop;
 422
 423         transfer_to[PRJQUOTA] = dqget(sb, make_kqid_projid(kprojid));
 424         if (!IS_ERR(transfer_to[PRJQUOTA])) {
 425
 426                 /* __dquot_transfer() calls back ext4_get_inode_usage() which
 427                  * counts xattr inode references.
 428                  */
 429                 down_read(&EXT4_I(inode)->xattr_sem);
 430                 err = __dquot_transfer(inode, transfer_to);
 431                 up_read(&EXT4_I(inode)->xattr_sem);
 432                 dqput(transfer_to[PRJQUOTA]);
 433                 if (err)
 434                         goto out_dirty;
 435         }
 436
 437         EXT4_I(inode)->i_projid = kprojid;
 438         inode->i_ctime = current_time(inode);
 439 out_dirty:
 440         rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
 441         if (!err)
 442                 err = rc;
 443 out_stop:
 444         ext4_journal_stop(handle);
 445         return err;
 446 }
 447 #else
 448 static int ext4_ioctl_setproject(struct file *filp, __u32 projid)
 449 {
 450         if (projid != EXT4_DEF_PROJID)
 451                 return -EOPNOTSUPP;
 452         return 0;
 453 }
 454 #endif
 455
 456 /* Transfer internal flags to xflags */
 457 static inline __u32 ext4_iflags_to_xflags(unsigned long iflags)
 458 {
 459         __u32 xflags = 0;
 460
 461         if (iflags & EXT4_SYNC_FL)
 462                 xflags |= FS_XFLAG_SYNC;
 463         if (iflags & EXT4_IMMUTABLE_FL)
 464                 xflags |= FS_XFLAG_IMMUTABLE;
 465         if (iflags & EXT4_APPEND_FL)
 466                 xflags |= FS_XFLAG_APPEND;
 467         if (iflags & EXT4_NODUMP_FL)
 468                 xflags |= FS_XFLAG_NODUMP;
 469         if (iflags & EXT4_NOATIME_FL)
 470                 xflags |= FS_XFLAG_NOATIME;
 471         if (iflags & EXT4_PROJINHERIT_FL)
 472                 xflags |= FS_XFLAG_PROJINHERIT;
 473         return xflags;
 474 }
 475
 476 #define EXT4_SUPPORTED_FS_XFLAGS (FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | \
 477                                   FS_XFLAG_APPEND | FS_XFLAG_NODUMP | \
 478                                   FS_XFLAG_NOATIME | FS_XFLAG_PROJINHERIT)
 479
 480 /* Transfer xflags flags to internal */
 481 static inline unsigned long ext4_xflags_to_iflags(__u32 xflags)
 482 {
 483         unsigned long iflags = 0;
 484
 485         if (xflags & FS_XFLAG_SYNC)
 486                 iflags |= EXT4_SYNC_FL;
 487         if (xflags & FS_XFLAG_IMMUTABLE)
 488                 iflags |= EXT4_IMMUTABLE_FL;
 489         if (xflags & FS_XFLAG_APPEND)
 490                 iflags |= EXT4_APPEND_FL;
 491         if (xflags & FS_XFLAG_NODUMP)
 492                 iflags |= EXT4_NODUMP_FL;
 493         if (xflags & FS_XFLAG_NOATIME)
 494                 iflags |= EXT4_NOATIME_FL;
 495         if (xflags & FS_XFLAG_PROJINHERIT)
 496                 iflags |= EXT4_PROJINHERIT_FL;
 497
 498         return iflags;
 499 }
 500
 501 static int ext4_shutdown(struct super_block *sb, unsigned long arg)
 502 {
 503         struct ext4_sb_info *sbi = EXT4_SB(sb);
 504         __u32 flags;
 505
 506         if (!capable(CAP_SYS_ADMIN))
 507                 return -EPERM;
 508
 509         if (get_user(flags, (__u32 __user *)arg))
 510                 return -EFAULT;
 511
 512         if (flags > EXT4_GOING_FLAGS_NOLOGFLUSH)
 513                 return -EINVAL;
 514
 515         if (ext4_forced_shutdown(sbi))
 516                 return 0;
 517
 518         ext4_msg(sb, KERN_ALERT, "shut down requested (%d)", flags);
 519
 520         switch (flags) {
 521         case EXT4_GOING_FLAGS_DEFAULT:
 522                 freeze_bdev(sb->s_bdev);
 523                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 524                 thaw_bdev(sb->s_bdev, sb);
 525                 break;
 526         case EXT4_GOING_FLAGS_LOGFLUSH:
 527                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 528                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal)) {
 529                         (void) ext4_force_commit(sb);
 530                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 531                 }
 532                 break;
 533         case EXT4_GOING_FLAGS_NOLOGFLUSH:
 534                 set_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
 535                 if (sbi->s_journal && !is_journal_aborted(sbi->s_journal))
 536                         jbd2_journal_abort(sbi->s_journal, -ESHUTDOWN);
 537                 break;
 538         default:
 539                 return -EINVAL;
 540         }
 541         clear_opt(sb, DISCARD);
 542         return 0;
 543 }
 544
 545 struct getfsmap_info {
 546         struct super_block      *gi_sb;
 547         struct fsmap_head __user *gi_data;
 548         unsigned int            gi_idx;
 549         __u32                   gi_last_flags;
 550 };
 551
 552 static int ext4_getfsmap_format(struct ext4_fsmap *xfm, void *priv)
 553 {
 554         struct getfsmap_info *info = priv;
 555         struct fsmap fm;
 556
 557         trace_ext4_getfsmap_mapping(info->gi_sb, xfm);
 558
 559         info->gi_last_flags = xfm->fmr_flags;
 560         ext4_fsmap_from_internal(info->gi_sb, &fm, xfm);
 561         if (copy_to_user(&info->gi_data->fmh_recs[info->gi_idx++], &fm,
 562                         sizeof(struct fsmap)))
 563                 return -EFAULT;
 564
 565         return 0;
 566 }
 567
 568 static int ext4_ioc_getfsmap(struct super_block *sb,
 569                              struct fsmap_head __user *arg)
 570 {
 571         struct getfsmap_info info = {0};
 572         struct ext4_fsmap_head xhead = {0};
 573         struct fsmap_head head;
 574         bool aborted = false;
 575         int error;
 576
 577         if (copy_from_user(&head, arg, sizeof(struct fsmap_head)))
 578                 return -EFAULT;
 579         if (memchr_inv(head.fmh_reserved, 0, sizeof(head.fmh_reserved)) ||
 580             memchr_inv(head.fmh_keys[0].fmr_reserved, 0,
 581                        sizeof(head.fmh_keys[0].fmr_reserved)) ||
 582             memchr_inv(head.fmh_keys[1].fmr_reserved, 0,
 583                        sizeof(head.fmh_keys[1].fmr_reserved)))
 584                 return -EINVAL;
 585         /*
 586          * ext4 doesn't report file extents at all, so the only valid
 587          * file offsets are the magic ones (all zeroes or all ones).
 588          */
 589         if (head.fmh_keys[0].fmr_offset ||
 590             (head.fmh_keys[1].fmr_offset != 0 &&
 591              head.fmh_keys[1].fmr_offset != -1ULL))
 592                 return -EINVAL;
 593
 594         xhead.fmh_iflags = head.fmh_iflags;
 595         xhead.fmh_count = head.fmh_count;
 596         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[0], &head.fmh_keys[0]);
 597         ext4_fsmap_to_internal(sb, &xhead.fmh_keys[1], &head.fmh_keys[1]);
 598
 599         trace_ext4_getfsmap_low_key(sb, &xhead.fmh_keys[0]);
 600         trace_ext4_getfsmap_high_key(sb, &xhead.fmh_keys[1]);
 601
 602         info.gi_sb = sb;
 603         info.gi_data = arg;
 604         error = ext4_getfsmap(sb, &xhead, ext4_getfsmap_format, &info);
 605         if (error == EXT4_QUERY_RANGE_ABORT) {
 606                 error = 0;
 607                 aborted = true;
 608         } else if (error)
 609                 return error;
 610
 611         /* If we didn't abort, set the "last" flag in the last fmx */
 612         if (!aborted && info.gi_idx) {
 613                 info.gi_last_flags |= FMR_OF_LAST;
 614                 if (copy_to_user(&info.gi_data->fmh_recs[info.gi_idx - 1].fmr_flags,
 615                                  &info.gi_last_flags,
 616                                  sizeof(info.gi_last_flags)))
 617                         return -EFAULT;
 618         }
 619
 620         /* copy back header */
 621         head.fmh_entries = xhead.fmh_entries;
 622         head.fmh_oflags = xhead.fmh_oflags;
 623         if (copy_to_user(arg, &head, sizeof(struct fsmap_head)))
 624                 return -EFAULT;
 625
 626         return 0;
 627 }
 628
 629 static int ext4_ioctl_check_project(struct inode *inode, struct fsxattr *fa)
 630 {
 631         /*
 632          * Project Quota ID state is only allowed to change from within the init
 633          * namespace. Enforce that restriction only if we are trying to change
 634          * the quota ID state. Everything else is allowed in user namespaces.
 635          */
 636         if (current_user_ns() == &init_user_ns)
 637                 return 0;
 638
 639         if (__kprojid_val(EXT4_I(inode)->i_projid) != fa->fsx_projid)
 640                 return -EINVAL;
 641
 642         if (ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT)) {
 643                 if (!(fa->fsx_xflags & FS_XFLAG_PROJINHERIT))
 644                         return -EINVAL;
 645         } else {
 646                 if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
 647                         return -EINVAL;
 648         }
 649
 650         return 0;
 651 }
 652
 653 long ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 654 {
 655         struct inode *inode = file_inode(filp);
 656         struct super_block *sb = inode->i_sb;
 657         struct ext4_inode_info *ei = EXT4_I(inode);
 658         unsigned int flags;
 659
 660         ext4_debug("cmd = %u, arg = %lu\n", cmd, arg);
 661
 662         switch (cmd) {
 663         case FS_IOC_GETFSMAP:
 664                 return ext4_ioc_getfsmap(sb, (void __user *)arg);
 665         case EXT4_IOC_GETFLAGS:
 666                 flags = ei->i_flags & EXT4_FL_USER_VISIBLE;
 667                 return put_user(flags, (int __user *) arg);
 668         case EXT4_IOC_SETFLAGS: {
 669                 int err;
 670
 671                 if (!inode_owner_or_capable(inode))
 672                         return -EACCES;
 673
 674                 if (get_user(flags, (int __user *) arg))
 675                         return -EFAULT;
 676
 677                 if (flags & ~EXT4_FL_USER_VISIBLE)
 678                         return -EOPNOTSUPP;
 679                 /*
 680                  * chattr(1) grabs flags via GETFLAGS, modifies the result and
 681                  * passes that to SETFLAGS. So we cannot easily make SETFLAGS
 682                  * more restrictive than just silently masking off visible but
 683                  * not settable flags as we always did.
 684                  */
 685                 flags &= EXT4_FL_USER_MODIFIABLE;
 686                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
 687                         return -EOPNOTSUPP;
 688
 689                 err = mnt_want_write_file(filp);
 690                 if (err)
 691                         return err;
 692
 693                 inode_lock(inode);
 694                 err = ext4_ioctl_check_immutable(inode,
 695                                 from_kprojid(&init_user_ns, ei->i_projid),
 696                                 flags);
 697                 if (!err)
 698                         err = ext4_ioctl_setflags(inode, flags);
 699                 inode_unlock(inode);
 700                 mnt_drop_write_file(filp);
 701                 return err;
 702         }
 703         case EXT4_IOC_GETVERSION:
 704         case EXT4_IOC_GETVERSION_OLD:
 705                 return put_user(inode->i_generation, (int __user *) arg);
 706         case EXT4_IOC_SETVERSION:
 707         case EXT4_IOC_SETVERSION_OLD: {
 708                 handle_t *handle;
 709                 struct ext4_iloc iloc;
 710                 __u32 generation;
 711                 int err;
 712
 713                 if (!inode_owner_or_capable(inode))
 714                         return -EPERM;
 715
 716                 if (ext4_has_metadata_csum(inode->i_sb)) {
 717                         ext4_warning(sb, "Setting inode version is not "
 718                                      "supported with metadata_csum enabled.");
 719                         return -ENOTTY;
 720                 }
 721
 722                 err = mnt_want_write_file(filp);
 723                 if (err)
 724                         return err;
 725                 if (get_user(generation, (int __user *) arg)) {
 726                         err = -EFAULT;
 727                         goto setversion_out;
 728                 }
 729
 730                 inode_lock(inode);
 731                 handle = ext4_journal_start(inode, EXT4_HT_INODE, 1);
 732                 if (IS_ERR(handle)) {
 733                         err = PTR_ERR(handle);
 734                         goto unlock_out;
 735                 }
 736                 err = ext4_reserve_inode_write(handle, inode, &iloc);
 737                 if (err == 0) {
 738                         inode->i_ctime = current_time(inode);
 739                         inode->i_generation = generation;
 740                         err = ext4_mark_iloc_dirty(handle, inode, &iloc);
 741                 }
 742                 ext4_journal_stop(handle);
 743
 744 unlock_out:
 745                 inode_unlock(inode);
 746 setversion_out:
 747                 mnt_drop_write_file(filp);
 748                 return err;
 749         }
 750         case EXT4_IOC_GROUP_EXTEND: {
 751                 ext4_fsblk_t n_blocks_count;
 752                 int err, err2=0;
 753
 754                 err = ext4_resize_begin(sb);
 755                 if (err)
 756                         return err;
 757
 758                 if (get_user(n_blocks_count, (__u32 __user *)arg)) {
 759                         err = -EFAULT;
 760                         goto group_extend_out;
 761                 }
 762
 763                 if (ext4_has_feature_bigalloc(sb)) {
 764                         ext4_msg(sb, KERN_ERR,
 765                                  "Online resizing not supported with bigalloc");
 766                         err = -EOPNOTSUPP;
 767                         goto group_extend_out;
 768                 }
 769
 770                 err = mnt_want_write_file(filp);
 771                 if (err)
 772                         goto group_extend_out;
 773
 774                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
 775                 if (EXT4_SB(sb)->s_journal) {
 776                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 777                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 778                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 779                 }
 780                 if (err == 0)
 781                         err = err2;
 782                 mnt_drop_write_file(filp);
 783 group_extend_out:
 784                 ext4_resize_end(sb);
 785                 return err;
 786         }
 787
 788         case EXT4_IOC_MOVE_EXT: {
 789                 struct move_extent me;
 790                 struct fd donor;
 791                 int err;
 792
 793                 if (!(filp->f_mode & FMODE_READ) ||
 794                     !(filp->f_mode & FMODE_WRITE))
 795                         return -EBADF;
 796
 797                 if (copy_from_user(&me,
 798                         (struct move_extent __user *)arg, sizeof(me)))
 799                         return -EFAULT;
 800                 me.moved_len = 0;
 801
 802                 donor = fdget(me.donor_fd);
 803                 if (!donor.file)
 804                         return -EBADF;
 805
 806                 if (!(donor.file->f_mode & FMODE_WRITE)) {
 807                         err = -EBADF;
 808                         goto mext_out;
 809                 }
 810
 811                 if (ext4_has_feature_bigalloc(sb)) {
 812                         ext4_msg(sb, KERN_ERR,
 813                                  "Online defrag not supported with bigalloc");
 814                         err = -EOPNOTSUPP;
 815                         goto mext_out;
 816                 } else if (IS_DAX(inode)) {
 817                         ext4_msg(sb, KERN_ERR,
 818                                  "Online defrag not supported with DAX");
 819                         err = -EOPNOTSUPP;
 820                         goto mext_out;
 821                 }
 822
 823                 err = mnt_want_write_file(filp);
 824                 if (err)
 825                         goto mext_out;
 826
 827                 err = ext4_move_extents(filp, donor.file, me.orig_start,
 828                                         me.donor_start, me.len, &me.moved_len);
 829                 mnt_drop_write_file(filp);
 830
 831                 if (copy_to_user((struct move_extent __user *)arg,
 832                                  &me, sizeof(me)))
 833                         err = -EFAULT;
 834 mext_out:
 835                 fdput(donor);
 836                 return err;
 837         }
 838
 839         case EXT4_IOC_GROUP_ADD: {
 840                 struct ext4_new_group_data input;
 841                 int err, err2=0;
 842
 843                 err = ext4_resize_begin(sb);
 844                 if (err)
 845                         return err;
 846
 847                 if (copy_from_user(&input, (struct ext4_new_group_input __user *)arg,
 848                                 sizeof(input))) {
 849                         err = -EFAULT;
 850                         goto group_add_out;
 851                 }
 852
 853                 if (ext4_has_feature_bigalloc(sb)) {
 854                         ext4_msg(sb, KERN_ERR,
 855                                  "Online resizing not supported with bigalloc");
 856                         err = -EOPNOTSUPP;
 857                         goto group_add_out;
 858                 }
 859
 860                 err = mnt_want_write_file(filp);
 861                 if (err)
 862                         goto group_add_out;
 863
 864                 err = ext4_group_add(sb, &input);
 865                 if (EXT4_SB(sb)->s_journal) {
 866                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 867                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 868                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 869                 }
 870                 if (err == 0)
 871                         err = err2;
 872                 mnt_drop_write_file(filp);
 873                 if (!err && ext4_has_group_desc_csum(sb) &&
 874                     test_opt(sb, INIT_INODE_TABLE))
 875                         err = ext4_register_li_request(sb, input.group);
 876 group_add_out:
 877                 ext4_resize_end(sb);
 878                 return err;
 879         }
 880
 881         case EXT4_IOC_MIGRATE:
 882         {
 883                 int err;
 884                 if (!inode_owner_or_capable(inode))
 885                         return -EACCES;
 886
 887                 err = mnt_want_write_file(filp);
 888                 if (err)
 889                         return err;
 890                 /*
 891                  * inode_mutex prevent write and truncate on the file.
 892                  * Read still goes through. We take i_data_sem in
 893                  * ext4_ext_swap_inode_data before we switch the
 894                  * inode format to prevent read.
 895                  */
 896                 inode_lock((inode));
 897                 err = ext4_ext_migrate(inode);
 898                 inode_unlock((inode));
 899                 mnt_drop_write_file(filp);
 900                 return err;
 901         }
 902
 903         case EXT4_IOC_ALLOC_DA_BLKS:
 904         {
 905                 int err;
 906                 if (!inode_owner_or_capable(inode))
 907                         return -EACCES;
 908
 909                 err = mnt_want_write_file(filp);
 910                 if (err)
 911                         return err;
 912                 err = ext4_alloc_da_blocks(inode);
 913                 mnt_drop_write_file(filp);
 914                 return err;
 915         }
 916
 917         case EXT4_IOC_SWAP_BOOT:
 918         {
 919                 int err;
 920                 if (!(filp->f_mode & FMODE_WRITE))
 921                         return -EBADF;
 922                 err = mnt_want_write_file(filp);
 923                 if (err)
 924                         return err;
 925                 err = swap_inode_boot_loader(sb, inode);
 926                 mnt_drop_write_file(filp);
 927                 return err;
 928         }
 929
 930         case EXT4_IOC_RESIZE_FS: {
 931                 ext4_fsblk_t n_blocks_count;
 932                 int err = 0, err2 = 0;
 933                 ext4_group_t o_group = EXT4_SB(sb)->s_groups_count;
 934
 935                 if (ext4_has_feature_bigalloc(sb)) {
 936                         ext4_msg(sb, KERN_ERR,
 937                                  "Online resizing not (yet) supported with bigalloc");
 938                         return -EOPNOTSUPP;
 939                 }
 940
 941                 if (copy_from_user(&n_blocks_count, (__u64 __user *)arg,
 942                                    sizeof(__u64))) {
 943                         return -EFAULT;
 944                 }
 945
 946                 err = ext4_resize_begin(sb);
 947                 if (err)
 948                         return err;
 949
 950                 err = mnt_want_write_file(filp);
 951                 if (err)
 952                         goto resizefs_out;
 953
 954                 err = ext4_resize_fs(sb, n_blocks_count);
 955                 if (EXT4_SB(sb)->s_journal) {
 956                         jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
 957                         err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
 958                         jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
 959                 }
 960                 if (err == 0)
 961                         err = err2;
 962                 mnt_drop_write_file(filp);
 963                 if (!err && (o_group < EXT4_SB(sb)->s_groups_count) &&
 964                     ext4_has_group_desc_csum(sb) &&
 965                     test_opt(sb, INIT_INODE_TABLE))
 966                         err = ext4_register_li_request(sb, o_group);
 967
 968 resizefs_out:
 969                 ext4_resize_end(sb);
 970                 return err;
 971         }
 972
 973         case FITRIM:
 974         {
 975                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 976                 struct fstrim_range range;
 977                 int ret = 0;
 978
 979                 if (!capable(CAP_SYS_ADMIN))
 980                         return -EPERM;
 981
 982                 if (!blk_queue_discard(q))
 983                         return -EOPNOTSUPP;
 984
 985                 /*
 986                  * We haven't replayed the journal, so we cannot use our
 987                  * block-bitmap-guided storage zapping commands.
 988                  */
 989                 if (test_opt(sb, NOLOAD) && ext4_has_feature_journal(sb))
 990                         return -EROFS;
 991
 992                 if (copy_from_user(&range, (struct fstrim_range __user *)arg,
 993                     sizeof(range)))
 994                         return -EFAULT;
 995
 996                 ret = ext4_trim_fs(sb, &range);
 997                 if (ret < 0)
 998                         return ret;
 999
1000                 if (copy_to_user((struct fstrim_range __user *)arg, &range,
1001                     sizeof(range)))
1002                         return -EFAULT;
1003
1004                 return 0;
1005         }
1006         case EXT4_IOC_PRECACHE_EXTENTS:
1007                 return ext4_ext_precache(inode);
1008
1009         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1010                 if (!ext4_has_feature_encrypt(sb))
1011                         return -EOPNOTSUPP;
1012                 return fscrypt_ioctl_set_policy(filp, (const void __user *)arg);
1013
1014         case EXT4_IOC_GET_ENCRYPTION_PWSALT: {
1015 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1016                 int err, err2;
1017                 struct ext4_sb_info *sbi = EXT4_SB(sb);
1018                 handle_t *handle;
1019
1020                 if (!ext4_has_feature_encrypt(sb))
1021                         return -EOPNOTSUPP;
1022                 if (uuid_is_zero(sbi->s_es->s_encrypt_pw_salt)) {
1023                         err = mnt_want_write_file(filp);
1024                         if (err)
1025                                 return err;
1026                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
1027                         if (IS_ERR(handle)) {
1028                                 err = PTR_ERR(handle);
1029                                 goto pwsalt_err_exit;
1030                         }
1031                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
1032                         if (err)
1033                                 goto pwsalt_err_journal;
1034                         lock_buffer(sbi->s_sbh);
1035                         generate_random_uuid(sbi->s_es->s_encrypt_pw_salt);
1036                         ext4_superblock_csum_set(sb);
1037                         unlock_buffer(sbi->s_sbh);
1038                         err = ext4_handle_dirty_metadata(handle, NULL,
1039                                                          sbi->s_sbh);
1040                 pwsalt_err_journal:
1041                         err2 = ext4_journal_stop(handle);
1042                         if (err2 && !err)
1043                                 err = err2;
1044                 pwsalt_err_exit:
1045                         mnt_drop_write_file(filp);
1046                         if (err)
1047                                 return err;
1048                 }
1049                 if (copy_to_user((void __user *) arg,
1050                                  sbi->s_es->s_encrypt_pw_salt, 16))
1051                         return -EFAULT;
1052                 return 0;
1053 #else
1054                 return -EOPNOTSUPP;
1055 #endif
1056         }
1057         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1058                 return fscrypt_ioctl_get_policy(filp, (void __user *)arg);
1059
1060         case EXT4_IOC_FSGETXATTR:
1061         {
1062                 struct fsxattr fa;
1063
1064                 memset(&fa, 0, sizeof(struct fsxattr));
1065                 fa.fsx_xflags = ext4_iflags_to_xflags(ei->i_flags & EXT4_FL_USER_VISIBLE);
1066
1067                 if (ext4_has_feature_project(inode->i_sb)) {
1068                         fa.fsx_projid = (__u32)from_kprojid(&init_user_ns,
1069                                 EXT4_I(inode)->i_projid);
1070                 }
1071
1072                 if (copy_to_user((struct fsxattr __user *)arg,
1073                                  &fa, sizeof(fa)))
1074                         return -EFAULT;
1075                 return 0;
1076         }
1077         case EXT4_IOC_FSSETXATTR:
1078         {
1079                 struct fsxattr fa;
1080                 int err;
1081
1082                 if (copy_from_user(&fa, (struct fsxattr __user *)arg,
1083                                    sizeof(fa)))
1084                         return -EFAULT;
1085
1086                 /* Make sure caller has proper permission */
1087                 if (!inode_owner_or_capable(inode))
1088                         return -EACCES;
1089
1090                 if (fa.fsx_xflags & ~EXT4_SUPPORTED_FS_XFLAGS)
1091                         return -EOPNOTSUPP;
1092
1093                 flags = ext4_xflags_to_iflags(fa.fsx_xflags);
1094                 if (ext4_mask_flags(inode->i_mode, flags) != flags)
1095                         return -EOPNOTSUPP;
1096
1097                 err = mnt_want_write_file(filp);
1098                 if (err)
1099                         return err;
1100
1101                 inode_lock(inode);
1102                 err = ext4_ioctl_check_project(inode, &fa);
1103                 if (err)
1104                         goto out;
1105                 flags = (ei->i_flags & ~EXT4_FL_XFLAG_VISIBLE) |
1106                          (flags & EXT4_FL_XFLAG_VISIBLE);
1107                 err = ext4_ioctl_check_immutable(inode, fa.fsx_projid, flags);
1108                 if (err)
1109                         goto out;
1110                 err = ext4_ioctl_setflags(inode, flags);
1111                 if (err)
1112                         goto out;
1113                 err = ext4_ioctl_setproject(filp, fa.fsx_projid);
1114 out:
1115                 inode_unlock(inode);
1116                 mnt_drop_write_file(filp);
1117                 return err;
1118         }
1119         case EXT4_IOC_SHUTDOWN:
1120                 return ext4_shutdown(sb, arg);
1121         default:
1122                 return -ENOTTY;
1123         }
1124 }
1125
1126 #ifdef CONFIG_COMPAT
1127 long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1128 {
1129         /* These are just misnamed, they actually get/put from/to user an int */
1130         switch (cmd) {
1131         case EXT4_IOC32_GETFLAGS:
1132                 cmd = EXT4_IOC_GETFLAGS;
1133                 break;
1134         case EXT4_IOC32_SETFLAGS:
1135                 cmd = EXT4_IOC_SETFLAGS;
1136                 break;
1137         case EXT4_IOC32_GETVERSION:
1138                 cmd = EXT4_IOC_GETVERSION;
1139                 break;
1140         case EXT4_IOC32_SETVERSION:
1141                 cmd = EXT4_IOC_SETVERSION;
1142                 break;
1143         case EXT4_IOC32_GROUP_EXTEND:
1144                 cmd = EXT4_IOC_GROUP_EXTEND;
1145                 break;
1146         case EXT4_IOC32_GETVERSION_OLD:
1147                 cmd = EXT4_IOC_GETVERSION_OLD;
1148                 break;
1149         case EXT4_IOC32_SETVERSION_OLD:
1150                 cmd = EXT4_IOC_SETVERSION_OLD;
1151                 break;
1152         case EXT4_IOC32_GETRSVSZ:
1153                 cmd = EXT4_IOC_GETRSVSZ;
1154                 break;
1155         case EXT4_IOC32_SETRSVSZ:
1156                 cmd = EXT4_IOC_SETRSVSZ;
1157                 break;
1158         case EXT4_IOC32_GROUP_ADD: {
1159                 struct compat_ext4_new_group_input __user *uinput;
1160                 struct ext4_new_group_input input;
1161                 mm_segment_t old_fs;
1162                 int err;
1163
1164                 uinput = compat_ptr(arg);
1165                 err = get_user(input.group, &uinput->group);
1166                 err |= get_user(input.block_bitmap, &uinput->block_bitmap);
1167                 err |= get_user(input.inode_bitmap, &uinput->inode_bitmap);
1168                 err |= get_user(input.inode_table, &uinput->inode_table);
1169                 err |= get_user(input.blocks_count, &uinput->blocks_count);
1170                 err |= get_user(input.reserved_blocks,
1171                                 &uinput->reserved_blocks);
1172                 if (err)
1173                         return -EFAULT;
1174                 old_fs = get_fs();
1175                 set_fs(KERNEL_DS);
1176                 err = ext4_ioctl(file, EXT4_IOC_GROUP_ADD,
1177                                  (unsigned long) &input);
1178                 set_fs(old_fs);
1179                 return err;
1180         }
1181         case EXT4_IOC_MOVE_EXT:
1182         case EXT4_IOC_RESIZE_FS:
1183         case EXT4_IOC_PRECACHE_EXTENTS:
1184         case EXT4_IOC_SET_ENCRYPTION_POLICY:
1185         case EXT4_IOC_GET_ENCRYPTION_PWSALT:
1186         case EXT4_IOC_GET_ENCRYPTION_POLICY:
1187         case EXT4_IOC_SHUTDOWN:
1188         case FS_IOC_GETFSMAP:
1189                 break;
1190         default:
1191                 return -ENOIOCTLCMD;
1192         }
1193         return ext4_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
1194 }
1195 #endif