zfs_byteswap.c revision ae480683925f95c1278b2284aa47d8c2d214be7b
/*
* 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 2008 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_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);
}
}