zfs_byteswap.c revision d5285cae913f4e01ffa0e6693a6d8ef1fbea30ba
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * CDDL HEADER START
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * The contents of this file are subject to the terms of the
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Common Development and Distribution License (the "License").
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * You may not use this file except in compliance with the License.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * or http://www.opensolaris.org/os/licensing.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * See the License for the specific language governing permissions
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * and limitations under the License.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * When distributing Covered Code, include this CDDL HEADER in each
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * If applicable, add the following below this CDDL HEADER, with the
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * fields enclosed by brackets "[]" replaced with your own identifying
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * information: Portions Copyright [yyyy] [name of copyright owner]
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * CDDL HEADER END
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Use is subject to license terms.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/zfs_context.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/vfs.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/fs/zfs.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/zfs_znode.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/zfs_sa.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <sys/zfs_acl.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinzfs_oldace_byteswap(ace_t *ace, int ace_cnt)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int i;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin for (i = 0; i != ace_cnt; i++, ace++) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace->a_who = BSWAP_32(ace->a_who);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace->a_access_mask = BSWAP_32(ace->a_access_mask);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace->a_flags = BSWAP_16(ace->a_flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace->a_type = BSWAP_16(ace->a_type);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * swap ace_t and ace_oject_t
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinzfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin caddr_t end;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin caddr_t ptr;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zfs_ace_t *zacep = NULL;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace_t *acep;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin uint16_t entry_type;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin size_t entry_size;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int ace_type;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin end = (caddr_t)buf + size;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ptr = buf;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (ptr < end) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (zfs_layout) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Avoid overrun. Embedded aces can have one
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * of several sizes. We don't know exactly
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * how many our present, only the size of the
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * buffer containing them. That size may be
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * larger than needed to hold the aces
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * present. As long as we do not do any
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * swapping beyond the end of our block we are
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * okay. It it safe to swap any non-ace data
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * within the block since it is just zeros.
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ptr + sizeof (zfs_ace_hdr_t) > end) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zacep = (zfs_ace_t *)ptr;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zacep->z_hdr.z_access_mask =
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin BSWAP_32(zacep->z_hdr.z_access_mask);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace_type = zacep->z_hdr.z_type =
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin BSWAP_16(zacep->z_hdr.z_type);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin } else {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /* Overrun avoidance */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ptr + sizeof (ace_t) > end) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin acep = (ace_t *)ptr;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin acep->a_access_mask = BSWAP_32(acep->a_access_mask);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin acep->a_flags = BSWAP_16(acep->a_flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ace_type = acep->a_type = BSWAP_16(acep->a_type);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin acep->a_who = BSWAP_32(acep->a_who);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_type = acep->a_flags & ACE_TYPE_FLAGS;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin switch (entry_type) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_OWNER:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_EVERYONE:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_size = zfs_layout ?
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_IDENTIFIER_GROUP:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin default:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /* Overrun avoidance */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (zfs_layout) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ptr + sizeof (zfs_ace_t) <= end) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zacep->z_fuid = BSWAP_64(zacep->z_fuid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin } else {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_size = sizeof (zfs_ace_t);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin switch (ace_type) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_size = zfs_layout ?
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin sizeof (zfs_object_ace_t) :
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin sizeof (ace_object_t);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin default:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin entry_size = zfs_layout ? sizeof (zfs_ace_t) :
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin sizeof (ace_t);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin break;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ptr = ptr + entry_size;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/* ARGSUSED */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinzfs_oldacl_byteswap(void *buf, size_t size)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin int cnt;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Arggh, since we don't know how many ACEs are in
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * the array, we have to swap the entire block
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin cnt = size / sizeof (ace_t);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zfs_oldace_byteswap((ace_t *)buf, cnt);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/* ARGSUSED */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinzfs_acl_byteswap(void *buf, size_t size)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zfs_ace_byteswap(buf, size, B_TRUE);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinvoid
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinzfs_znode_byteswap(void *buf, size_t size)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin znode_phys_t *zp = buf;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ASSERT(size >= sizeof (znode_phys_t));
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_gen = BSWAP_64(zp->zp_gen);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_mode = BSWAP_64(zp->zp_mode);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_size = BSWAP_64(zp->zp_size);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_parent = BSWAP_64(zp->zp_parent);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_links = BSWAP_64(zp->zp_links);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_xattr = BSWAP_64(zp->zp_xattr);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_rdev = BSWAP_64(zp->zp_rdev);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_flags = BSWAP_64(zp->zp_flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_uid = BSWAP_64(zp->zp_uid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_gid = BSWAP_64(zp->zp_gid);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_zap = BSWAP_64(zp->zp_zap);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ZFS_ACE_SPACE);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin } else {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ACE_SLOT_CNT);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin