1 /* $NetBSD: ext2fs_bswap.c,v 1.26 2025/12/24 15:06:59 nia 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 1.26 2025/12/24 15:06:59 nia Exp $"); 30 31 #include <sys/types.h> 32 #include <sys/endian.h> 33 #include <ufs/ext2fs/ext2fs.h> 34 #include <ufs/ext2fs/ext2fs_dinode.h> 35 36 #if defined(_KERNEL) 37 #include <sys/systm.h> 38 #else 39 #include <string.h> 40 #endif 41 42 /* These functions are only needed if native byte order is not little endian */ 43 #if BYTE_ORDER == BIG_ENDIAN 44 void 45 e2fs_sb_bswap(struct ext2fs *old, struct ext2fs *new) 46 { 47 48 /* preserve unused fields */ 49 memcpy(new, old, sizeof(struct ext2fs)); 50 new->e2fs_icount = bswap32(old->e2fs_icount); 51 new->e2fs_bcount = bswap32(old->e2fs_bcount); 52 new->e2fs_rbcount = bswap32(old->e2fs_rbcount); 53 new->e2fs_fbcount = bswap32(old->e2fs_fbcount); 54 new->e2fs_ficount = bswap32(old->e2fs_ficount); 55 new->e2fs_first_dblock = bswap32(old->e2fs_first_dblock); 56 new->e2fs_log_bsize = bswap32(old->e2fs_log_bsize); 57 new->e2fs_fsize = bswap32(old->e2fs_fsize); 58 new->e2fs_bpg = bswap32(old->e2fs_bpg); 59 new->e2fs_fpg = bswap32(old->e2fs_fpg); 60 new->e2fs_ipg = bswap32(old->e2fs_ipg); 61 new->e2fs_mtime = bswap32(old->e2fs_mtime); 62 new->e2fs_wtime = bswap32(old->e2fs_wtime); 63 new->e2fs_mnt_count = bswap16(old->e2fs_mnt_count); 64 new->e2fs_max_mnt_count = bswap16(old->e2fs_max_mnt_count); 65 new->e2fs_magic = bswap16(old->e2fs_magic); 66 new->e2fs_state = bswap16(old->e2fs_state); 67 new->e2fs_beh = bswap16(old->e2fs_beh); 68 new->e2fs_minrev = bswap16(old->e2fs_minrev); 69 new->e2fs_lastfsck = bswap32(old->e2fs_lastfsck); 70 new->e2fs_fsckintv = bswap32(old->e2fs_fsckintv); 71 new->e2fs_creator = bswap32(old->e2fs_creator); 72 new->e2fs_rev = bswap32(old->e2fs_rev); 73 new->e2fs_ruid = bswap16(old->e2fs_ruid); 74 new->e2fs_rgid = bswap16(old->e2fs_rgid); 75 new->e2fs_first_ino = bswap32(old->e2fs_first_ino); 76 new->e2fs_inode_size = bswap16(old->e2fs_inode_size); 77 new->e2fs_block_group_nr = bswap16(old->e2fs_block_group_nr); 78 new->e2fs_features_compat = bswap32(old->e2fs_features_compat); 79 new->e2fs_features_incompat = bswap32(old->e2fs_features_incompat); 80 new->e2fs_features_rocompat = bswap32(old->e2fs_features_rocompat); 81 new->e2fs_algo = bswap32(old->e2fs_algo); 82 new->e2fs_reserved_ngdb = bswap16(old->e2fs_reserved_ngdb); 83 new->e4fs_want_extra_isize = bswap16(old->e4fs_want_extra_isize); 84 } 85 86 void 87 e2fs_i_bswap(struct ext2fs_dinode *old, struct ext2fs_dinode *new, size_t isize) 88 { 89 /* preserve non-swapped and unused fields */ 90 memcpy(new, old, isize); 91 92 /* swap what needs to be swapped */ 93 new->e2di_mode = bswap16(old->e2di_mode); 94 new->e2di_uid = bswap16(old->e2di_uid); 95 new->e2di_gid = bswap16(old->e2di_gid); 96 new->e2di_nlink = bswap16(old->e2di_nlink); 97 new->e2di_size = bswap32(old->e2di_size); 98 new->e2di_atime = bswap32(old->e2di_atime); 99 new->e2di_ctime = bswap32(old->e2di_ctime); 100 new->e2di_mtime = bswap32(old->e2di_mtime); 101 new->e2di_dtime = bswap32(old->e2di_dtime); 102 new->e2di_nblock = bswap32(old->e2di_nblock); 103 new->e2di_flags = bswap32(old->e2di_flags); 104 new->e2di_version = bswap32(old->e2di_version); 105 new->e2di_gen = bswap32(old->e2di_gen); 106 new->e2di_facl = bswap32(old->e2di_facl); 107 new->e2di_size_high = bswap32(old->e2di_size_high); 108 new->e2di_nblock_high = bswap16(old->e2di_nblock_high); 109 new->e2di_facl_high = bswap16(old->e2di_facl_high); 110 new->e2di_uid_high = bswap16(old->e2di_uid_high); 111 new->e2di_gid_high = bswap16(old->e2di_gid_high); 112 new->e2di_checksum_low = bswap16(old->e2di_checksum_low); 113 114 /* 115 * Following fields are only supported for inode sizes bigger 116 * than the old ext2 one 117 */ 118 if (isize == EXT2_REV0_DINODE_SIZE) 119 return; 120 121 new->e2di_extra_isize = bswap16(old->e2di_extra_isize); 122 new->e2di_checksum_high = bswap16(old->e2di_checksum_high); 123 124 /* Following fields are ext4, might not be actually present */ 125 if (EXT2_DINODE_FITS(new, e2di_ctime_extra, isize)) 126 new->e2di_ctime_extra = bswap32(old->e2di_ctime_extra); 127 if (EXT2_DINODE_FITS(new, e2di_mtime_extra, isize)) 128 new->e2di_mtime_extra = bswap32(old->e2di_mtime_extra); 129 if (EXT2_DINODE_FITS(new, e2di_atime_extra, isize)) 130 new->e2di_atime_extra = bswap32(old->e2di_atime_extra); 131 if (EXT2_DINODE_FITS(new, e2di_crtime, isize)) 132 new->e2di_crtime = bswap32(old->e2di_crtime); 133 if (EXT2_DINODE_FITS(new, e2di_crtime_extra, isize)) 134 new->e2di_crtime_extra = bswap32(old->e2di_crtime_extra); 135 if (EXT2_DINODE_FITS(new, e2di_version_high, isize)) 136 new->e2di_version_high = bswap32(old->e2di_version_high); 137 if (EXT2_DINODE_FITS(new, e2di_projid, isize)) 138 new->e2di_projid = bswap32(old->e2di_projid); 139 } 140 #endif 141
Indexes created Sun Oct 25 00:26:45 UTC 2026