add bi-endian support to the libsa ufs reader and enable it in efiboot.

ffs frontends to "ufs.c" now also define ufs_dinode_swap, ufs_indp_swap,
and FS_MAGIC (moved from ufs.c #if segments.)  these are used to call
the right (32/64 bit) ffsv1/v2 version.

ufs.c 'struct file' gains f_swapped member.  accessors for d_magic,
d_reclen, and d_ino are introduced (they need to be swapped.)  sfter
reading an inode from disk, read_inode() may call ufs_dinode_swap().
indirect block number and caches may be swapped.

error handling in ffs_find_superblock() is cleaned up.  (size is slightly
reduced on some ports with this part.)

defaults for new defines added to ufs.c.  (XXX: we build ufs.c but i think
all the consumers don't use it, and we can stop building it.)

LFS support is not included.

add a cut-down copy of ffs_bswap.c from the kernel.

also enable bi-endian disklabel support in efiboot.

most ports build and sizes compared for platforms that don't enable this
code and all but one saw reduced code size.  booted several platforms with
new boot code.


(mrg)

/*	$NetBSD: ffs_bswap.c,v 1.1 2021/05/27 06:54:44 mrg Exp $	*/

/*
 * Copyright (c) 1998 Manuel Bouyer.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

/*
 * This copy is a minimal version for libsa and it's ufs.c.  The unused
 * functions are removed, and additional swapping is performed on the
 * di_extb, di_db, and di_ib arrays.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ffs_bswap.c,v 1.1 2021/05/27 06:54:44 mrg Exp $");

#include <sys/param.h>
#include <lib/libkern/libkern.h>

#include <ufs/ufs/dinode.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufs_bswap.h>
#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

static void
libsa_ffs_csumtotal_swap(const struct csum_total *o, struct csum_total *n)
{
	n->cs_ndir = bswap64(o->cs_ndir);
	n->cs_nbfree = bswap64(o->cs_nbfree);
	n->cs_nifree = bswap64(o->cs_nifree);
	n->cs_nffree = bswap64(o->cs_nffree);
}

void
ffs_sb_swap(const struct fs *o, struct fs *n)
{
	size_t i;
	const u_int32_t *o32;
	u_int32_t *n32;

	/*
	 * In order to avoid a lot of lines, as the first N fields (52)
	 * of the superblock up to fs_fmod are u_int32_t, we just loop
	 * here to convert them.
	 */
	o32 = (const u_int32_t *)o;
	n32 = (u_int32_t *)n;
	for (i = 0; i < offsetof(struct fs, fs_fmod) / sizeof(u_int32_t); i++)
		n32[i] = bswap32(o32[i]);

	n->fs_swuid = bswap64(o->fs_swuid);
	n->fs_cgrotor = bswap32(o->fs_cgrotor); /* Unused */
	n->fs_old_cpc = bswap32(o->fs_old_cpc);

	/* These fields overlap with a possible location for the
	 * historic FS_DYNAMICPOSTBLFMT postbl table, and with the
	 * first half of the historic FS_42POSTBLFMT postbl table.
	 */
	n->fs_maxbsize = bswap32(o->fs_maxbsize);
	/* XXX journal */
	n->fs_quota_magic = bswap32(o->fs_quota_magic);
	for (i = 0; i < MAXQUOTAS; i++)
		n->fs_quotafile[i] = bswap64(o->fs_quotafile[i]);
	n->fs_sblockloc = bswap64(o->fs_sblockloc);
	libsa_ffs_csumtotal_swap(&o->fs_cstotal, &n->fs_cstotal);
	n->fs_time = bswap64(o->fs_time);
	n->fs_size = bswap64(o->fs_size);
	n->fs_dsize = bswap64(o->fs_dsize);
	n->fs_csaddr = bswap64(o->fs_csaddr);
	n->fs_pendingblocks = bswap64(o->fs_pendingblocks);
	n->fs_pendinginodes = bswap32(o->fs_pendinginodes);

	/* These fields overlap with the second half of the
	 * historic FS_42POSTBLFMT postbl table
	 */
	for (i = 0; i < FSMAXSNAP; i++)
		n->fs_snapinum[i] = bswap32(o->fs_snapinum[i]);
	n->fs_avgfilesize = bswap32(o->fs_avgfilesize);
	n->fs_avgfpdir = bswap32(o->fs_avgfpdir);
	/* fs_sparecon[28] - ignore for now */
	n->fs_flags = bswap32(o->fs_flags);
	n->fs_contigsumsize = bswap32(o->fs_contigsumsize);
	n->fs_maxsymlinklen = bswap32(o->fs_maxsymlinklen);
	n->fs_old_inodefmt = bswap32(o->fs_old_inodefmt);
	n->fs_maxfilesize = bswap64(o->fs_maxfilesize);
	n->fs_qbmask = bswap64(o->fs_qbmask);
	n->fs_qfmask = bswap64(o->fs_qfmask);
	n->fs_state = bswap32(o->fs_state);
	n->fs_old_postblformat = bswap32(o->fs_old_postblformat);
	n->fs_old_nrpos = bswap32(o->fs_old_nrpos);
	n->fs_old_postbloff = bswap32(o->fs_old_postbloff);
	n->fs_old_rotbloff = bswap32(o->fs_old_rotbloff);

	n->fs_magic = bswap32(o->fs_magic);
}

void
ffs_dinode1_swap(struct ufs1_dinode *o, struct ufs1_dinode *n)
{
	size_t i;

	n->di_mode = bswap16(o->di_mode);
	n->di_nlink = bswap16(o->di_nlink);
	n->di_oldids[0] = bswap16(o->di_oldids[0]);
	n->di_oldids[1] = bswap16(o->di_oldids[1]);
	n->di_size = bswap64(o->di_size);
	n->di_atime = bswap32(o->di_atime);
	n->di_atimensec = bswap32(o->di_atimensec);
	n->di_mtime = bswap32(o->di_mtime);
	n->di_mtimensec = bswap32(o->di_mtimensec);
	n->di_ctime = bswap32(o->di_ctime);
	n->di_ctimensec = bswap32(o->di_ctimensec);
	/* Swap these here, unlike kernel version .*/
	for (i = 0; i < UFS_NDADDR; i++)
		n->di_db[i] = bswap32(o->di_db[i]);
	for (i = 0; i < UFS_NIADDR; i++)
		n->di_ib[i] = bswap32(o->di_ib[i]);
	n->di_flags = bswap32(o->di_flags);
	n->di_blocks = bswap32(o->di_blocks);
	n->di_gen = bswap32(o->di_gen);
	n->di_uid = bswap32(o->di_uid);
	n->di_gid = bswap32(o->di_gid);
}

void
ffs_dinode2_swap(struct ufs2_dinode *o, struct ufs2_dinode *n)
{
	size_t i;

	n->di_mode = bswap16(o->di_mode);
	n->di_nlink = bswap16(o->di_nlink);
	n->di_uid = bswap32(o->di_uid);
	n->di_gid = bswap32(o->di_gid);
	n->di_blksize = bswap32(o->di_blksize);
	n->di_size = bswap64(o->di_size);
	n->di_blocks = bswap64(o->di_blocks);
	n->di_atime = bswap64(o->di_atime);
	n->di_atimensec = bswap32(o->di_atimensec);
	n->di_mtime = bswap64(o->di_mtime);
	n->di_mtimensec = bswap32(o->di_mtimensec);
	n->di_ctime = bswap64(o->di_ctime);
	n->di_ctimensec = bswap32(o->di_ctimensec);
	n->di_birthtime = bswap64(o->di_birthtime);
	n->di_birthnsec = bswap32(o->di_birthnsec);
	n->di_gen = bswap32(o->di_gen);
	n->di_kernflags = bswap32(o->di_kernflags);
	n->di_flags = bswap32(o->di_flags);
	n->di_extsize = bswap32(o->di_extsize);
	/* Swap these here, unlike kernel version .*/
	for (i = 0; i < UFS_NXADDR; i++)
		n->di_extb[i] = bswap64(o->di_extb[i]);
	for (i = 0; i < UFS_NDADDR; i++)
		n->di_db[i] = bswap64(o->di_db[i]);
	for (i = 0; i < UFS_NIADDR; i++)
		n->di_ib[i] = bswap64(o->di_ib[i]);
}