/*

 * CDDL HEADER START

 *

 * The contents of this file are subject to the terms of the

 * Common Development and Distribution License (the "License").

 * You may not use this file except in compliance with the License.

 *

 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE

 * or http://www.opensolaris.org/os/licensing.

 * See the License for the specific language governing permissions

 * and limitations under the License.

 *

 * When distributing Covered Code, include this CDDL HEADER in each

 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.

 * If applicable, add the following below this CDDL HEADER, with the

 * fields enclosed by brackets "[]" replaced with your own identifying

 * information: Portions Copyright [yyyy] [name of copyright owner]

 *

 * CDDL HEADER END

 */

/*

 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.

 * Use is subject to license terms.

 */

#include <sys/zfs_context.h>

#include <sys/vfs.h>

#include <sys/fs/zfs.h>

#include <sys/zfs_znode.h>

#include <sys/zfs_sa.h>

#include <sys/zfs_acl.h>

void

zfs_oldace_byteswap(ace_t *ace, int ace_cnt)

{

	int i;

	for (i = 0; i != ace_cnt; i++, ace++) {

		ace->a_who = BSWAP_32(ace->a_who);

		ace->a_access_mask = BSWAP_32(ace->a_access_mask);

		ace->a_flags = BSWAP_16(ace->a_flags);

		ace->a_type = BSWAP_16(ace->a_type);

	}

}

/*

 * swap ace_t and ace_oject_t

 */

void

zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)

{

	caddr_t end;

	caddr_t ptr;

	zfs_ace_t *zacep;

	ace_t *acep;

	uint16_t entry_type;

	size_t entry_size;

	int ace_type;

	end = (caddr_t)buf + size;

	ptr = buf;

	while (ptr < end) {

		if (zfs_layout) {

			/*

			 * Avoid overrun.  Embedded aces can have one

			 * of several sizes.  We don't know exactly

			 * how many our present, only the size of the

			 * buffer containing them.  That size may be

			 * larger than needed to hold the aces

			 * present.  As long as we do not do any

			 * swapping beyond the end of our block we are

			 * okay.  It it safe to swap any non-ace data

			 * within the block since it is just zeros.

			 */

			if (ptr + sizeof (zfs_ace_hdr_t) > end) {

				break;

			}

			zacep = (zfs_ace_t *)ptr;

			zacep->z_hdr.z_access_mask =

			    BSWAP_32(zacep->z_hdr.z_access_mask);

			zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);

			ace_type = zacep->z_hdr.z_type =

			    BSWAP_16(zacep->z_hdr.z_type);

			entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;

		} else {

			/* Overrun avoidance */

			if (ptr + sizeof (ace_t) > end) {

				break;

			}

			acep = (ace_t *)ptr;

			acep->a_access_mask = BSWAP_32(acep->a_access_mask);

			acep->a_flags = BSWAP_16(acep->a_flags);

			ace_type = acep->a_type = BSWAP_16(acep->a_type);

			acep->a_who = BSWAP_32(acep->a_who);

			entry_type = acep->a_flags & ACE_TYPE_FLAGS;

		}

		switch (entry_type) {

		case ACE_OWNER:

		case ACE_EVERYONE:

		case (ACE_IDENTIFIER_GROUP | ACE_GROUP):

			entry_size = zfs_layout ?

			    sizeof (zfs_ace_hdr_t) : sizeof (ace_t);

			break;

		case ACE_IDENTIFIER_GROUP:

		default:

			/* Overrun avoidance */

			if (zfs_layout) {

				if (ptr + sizeof (zfs_ace_t) <= end) {

					zacep->z_fuid = BSWAP_64(zacep->z_fuid);

				} else {

					entry_size = sizeof (zfs_ace_t);

					break;

				}

			}

			switch (ace_type) {

			case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:

			case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:

			case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:

			case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:

				entry_size = zfs_layout ?

				    sizeof (zfs_object_ace_t) :

				    sizeof (ace_object_t);

				break;

			default:

				entry_size = zfs_layout ? sizeof (zfs_ace_t) :

				    sizeof (ace_t);

				break;

			}

		}

		ptr = ptr + entry_size;

	}

}

/* ARGSUSED */

void

zfs_oldacl_byteswap(void *buf, size_t size)

{

	int cnt;

	/*

	 * Arggh, since we don't know how many ACEs are in

	 * the array, we have to swap the entire block

	 */

	cnt = size / sizeof (ace_t);

	zfs_oldace_byteswap((ace_t *)buf, cnt);

}

/* ARGSUSED */

void

zfs_acl_byteswap(void *buf, size_t size)

{

	zfs_ace_byteswap(buf, size, B_TRUE);

}

void

zfs_znode_byteswap(void *buf, size_t size)

{

	znode_phys_t *zp = buf;

	ASSERT(size >= sizeof (znode_phys_t));

	zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);

	zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);

	zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);

	zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);

	zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);

	zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);

	zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);

	zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);

	zp->zp_gen = BSWAP_64(zp->zp_gen);

	zp->zp_mode = BSWAP_64(zp->zp_mode);

	zp->zp_size = BSWAP_64(zp->zp_size);

	zp->zp_parent = BSWAP_64(zp->zp_parent);

	zp->zp_links = BSWAP_64(zp->zp_links);

	zp->zp_xattr = BSWAP_64(zp->zp_xattr);

	zp->zp_rdev = BSWAP_64(zp->zp_rdev);

	zp->zp_flags = BSWAP_64(zp->zp_flags);

	zp->zp_uid = BSWAP_64(zp->zp_uid);

	zp->zp_gid = BSWAP_64(zp->zp_gid);

	zp->zp_zap = BSWAP_64(zp->zp_zap);

	zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);

	zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);

	zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);

	zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);

	zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);

	zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);

	zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);

	if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {

		zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],

		    ZFS_ACE_SPACE);

	} else {

		zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],

		    ACE_SLOT_CNT);

	}

}