| 1 | /* $NetBSD: ext2fs_bswap.c,v 1.24 2016/08/20 19:47:44 jdolecek Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1997 Manuel Bouyer. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <sys/cdefs.h> |
| 29 | __KERNEL_RCSID(0, "$NetBSD: ext2fs_bswap.c,v 1.24 2016/08/20 19:47:44 jdolecek Exp $" ); |
| 30 | |
| 31 | #include <sys/types.h> |
| 32 | #include <ufs/ext2fs/ext2fs.h> |
| 33 | #include <ufs/ext2fs/ext2fs_dinode.h> |
| 34 | |
| 35 | #if defined(_KERNEL) |
| 36 | #include <sys/systm.h> |
| 37 | #else |
| 38 | #include <string.h> |
| 39 | #endif |
| 40 | |
| 41 | /* These functions are only needed if native byte order is not little endian */ |
| 42 | #if BYTE_ORDER == BIG_ENDIAN |
| 43 | void |
| 44 | e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *new) |
| 45 | { |
| 46 | |
| 47 | /* preserve unused fields */ |
| 48 | memcpy(new, old, sizeof(struct ext2fs)); |
| 49 | new->e2fs_icount = bswap32(old->e2fs_icount); |
| 50 | new->e2fs_bcount = bswap32(old->e2fs_bcount); |
| 51 | new->e2fs_rbcount = bswap32(old->e2fs_rbcount); |
| 52 | new->e2fs_fbcount = bswap32(old->e2fs_fbcount); |
| 53 | new->e2fs_ficount = bswap32(old->e2fs_ficount); |
| 54 | new->e2fs_first_dblock = bswap32(old->e2fs_first_dblock); |
| 55 | new->e2fs_log_bsize = bswap32(old->e2fs_log_bsize); |
| 56 | new->e2fs_fsize = bswap32(old->e2fs_fsize); |
| 57 | new->e2fs_bpg = bswap32(old->e2fs_bpg); |
| 58 | new->e2fs_fpg = bswap32(old->e2fs_fpg); |
| 59 | new->e2fs_ipg = bswap32(old->e2fs_ipg); |
| 60 | new->e2fs_mtime = bswap32(old->e2fs_mtime); |
| 61 | new->e2fs_wtime = bswap32(old->e2fs_wtime); |
| 62 | new->e2fs_mnt_count = bswap16(old->e2fs_mnt_count); |
| 63 | new->e2fs_max_mnt_count = bswap16(old->e2fs_max_mnt_count); |
| 64 | new->e2fs_magic = bswap16(old->e2fs_magic); |
| 65 | new->e2fs_state = bswap16(old->e2fs_state); |
| 66 | new->e2fs_beh = bswap16(old->e2fs_beh); |
| 67 | new->e2fs_minrev = bswap16(old->e2fs_minrev); |
| 68 | new->e2fs_lastfsck = bswap32(old->e2fs_lastfsck); |
| 69 | new->e2fs_fsckintv = bswap32(old->e2fs_fsckintv); |
| 70 | new->e2fs_creator = bswap32(old->e2fs_creator); |
| 71 | new->e2fs_rev = bswap32(old->e2fs_rev); |
| 72 | new->e2fs_ruid = bswap16(old->e2fs_ruid); |
| 73 | new->e2fs_rgid = bswap16(old->e2fs_rgid); |
| 74 | new->e2fs_first_ino = bswap32(old->e2fs_first_ino); |
| 75 | new->e2fs_inode_size = bswap16(old->e2fs_inode_size); |
| 76 | new->e2fs_block_group_nr = bswap16(old->e2fs_block_group_nr); |
| 77 | new->e2fs_features_compat = bswap32(old->e2fs_features_compat); |
| 78 | new->e2fs_features_incompat = bswap32(old->e2fs_features_incompat); |
| 79 | new->e2fs_features_rocompat = bswap32(old->e2fs_features_rocompat); |
| 80 | new->e2fs_algo = bswap32(old->e2fs_algo); |
| 81 | new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb); |
| 82 | new->e4fs_want_extra_isize = bswap16(old->e4fs_want_extra_isize); |
| 83 | } |
| 84 | |
| 85 | void |
| 86 | e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize) |
| 87 | { |
| 88 | /* preserve non-swapped and unused fields */ |
| 89 | memcpy(new, old, isize); |
| 90 | |
| 91 | /* swap what needs to be swapped */ |
| 92 | new->e2di_mode = bswap16(old->e2di_mode); |
| 93 | new->e2di_uid = bswap16(old->e2di_uid); |
| 94 | new->e2di_gid = bswap16(old->e2di_gid); |
| 95 | new->e2di_nlink = bswap16(old->e2di_nlink); |
| 96 | new->e2di_size = bswap32(old->e2di_size); |
| 97 | new->e2di_atime = bswap32(old->e2di_atime); |
| 98 | new->e2di_ctime = bswap32(old->e2di_ctime); |
| 99 | new->e2di_mtime = bswap32(old->e2di_mtime); |
| 100 | new->e2di_dtime = bswap32(old->e2di_dtime); |
| 101 | new->e2di_nblock = bswap32(old->e2di_nblock); |
| 102 | new->e2di_flags = bswap32(old->e2di_flags); |
| 103 | new->e2di_version = bswap32(old->e2di_version); |
| 104 | new->e2di_gen = bswap32(old->e2di_gen); |
| 105 | new->e2di_facl = bswap32(old->e2di_facl); |
| 106 | new->e2di_size_high = bswap32(old->e2di_size_high); |
| 107 | new->e2di_nblock_high = bswap16(old->e2di_nblock_high); |
| 108 | new->e2di_facl_high = bswap16(old->e2di_facl_high); |
| 109 | new->e2di_uid_high = bswap16(old->e2di_uid_high); |
| 110 | new->e2di_gid_high = bswap16(old->e2di_gid_high); |
| 111 | new->e2di_checksum_low = bswap16(old->e2di_checksum_low); |
| 112 | |
| 113 | /* |
| 114 | * Following fields are only supported for inode sizes bigger |
| 115 | * than the old ext2 one |
| 116 | */ |
| 117 | if (isize == EXT2_REV0_DINODE_SIZE) |
| 118 | return; |
| 119 | |
| 120 | new->e2di_extra_isize = bswap16(old->e2di_extra_isize); |
| 121 | new->e2di_checksum_high = bswap16(old->e2di_checksum_high); |
| 122 | |
| 123 | /* Following fields are ext4, might not be actually present */ |
| 124 | if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize)) |
| 125 | new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra); |
| 126 | if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize)) |
| 127 | new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra); |
| 128 | if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize)) |
| 129 | new->e2di_atime_extra = bswap32(old->e2di_atime_extra); |
| 130 | if (EXT2_DINODE_FITS(new, e2di_crtime, isize)) |
| 131 | new->e2di_crtime = bswap32(old->e2di_crtime); |
| 132 | if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize)) |
| 133 | new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra); |
| 134 | if (EXT2_DINODE_FITS(new, e2di_version_high, isize)) |
| 135 | new->e2di_version_high = bswap32(old->e2di_version_high); |
| 136 | if (EXT2_DINODE_FITS(new, e2di_projid, isize)) |
| 137 | new->e2di_projid = bswap32(old->e2di_projid); |
| 138 | } |
| 139 | #endif |
| 140 | |