1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25
26#include <sys/zfs_context.h>
27#include <sys/vfs.h>
28#include <sys/fs/zfs.h>
29#include <sys/zfs_znode.h>
30#include <sys/zfs_acl.h>
31
32void
33zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
34{
35	int i;
36
37	for (i = 0; i != ace_cnt; i++, ace++) {
38		ace->a_who = BSWAP_32(ace->a_who);
39		ace->a_access_mask = BSWAP_32(ace->a_access_mask);
40		ace->a_flags = BSWAP_16(ace->a_flags);
41		ace->a_type = BSWAP_16(ace->a_type);
42	}
43}
44
45/*
46 * swap ace_t and ace_oject_t
47 */
48void
49zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
50{
51	caddr_t end;
52	caddr_t ptr;
53	zfs_ace_t *zacep;
54	ace_t *acep;
55	uint16_t entry_type;
56	size_t entry_size;
57	int ace_type;
58
59	end = (caddr_t)buf + size;
60	ptr = buf;
61
62	while (ptr < end) {
63		if (zfs_layout) {
64			/*
65			 * Avoid overrun.  Embedded aces can have one
66			 * of several sizes.  We don't know exactly
67			 * how many our present, only the size of the
68			 * buffer containing them.  That size may be
69			 * larger than needed to hold the aces
70			 * present.  As long as we do not do any
71			 * swapping beyond the end of our block we are
72			 * okay.  It it safe to swap any non-ace data
73			 * within the block since it is just zeros.
74			 */
75			if (ptr + sizeof (zfs_ace_hdr_t) > end) {
76				break;
77			}
78			zacep = (zfs_ace_t *)ptr;
79			zacep->z_hdr.z_access_mask =
80			    BSWAP_32(zacep->z_hdr.z_access_mask);
81			zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
82			ace_type = zacep->z_hdr.z_type =
83			    BSWAP_16(zacep->z_hdr.z_type);
84			entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
85		} else {
86			/* Overrun avoidance */
87			if (ptr + sizeof (ace_t) > end) {
88				break;
89			}
90			acep = (ace_t *)ptr;
91			acep->a_access_mask = BSWAP_32(acep->a_access_mask);
92			acep->a_flags = BSWAP_16(acep->a_flags);
93			ace_type = acep->a_type = BSWAP_16(acep->a_type);
94			acep->a_who = BSWAP_32(acep->a_who);
95			entry_type = acep->a_flags & ACE_TYPE_FLAGS;
96		}
97		switch (entry_type) {
98		case ACE_OWNER:
99		case ACE_EVERYONE:
100		case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
101			entry_size = zfs_layout ?
102			    sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
103			break;
104		case ACE_IDENTIFIER_GROUP:
105		default:
106			/* Overrun avoidance */
107			if (zfs_layout) {
108				if (ptr + sizeof (zfs_ace_t) <= end) {
109					zacep->z_fuid = BSWAP_64(zacep->z_fuid);
110				} else {
111					entry_size = sizeof (zfs_ace_t);
112					break;
113				}
114			}
115			switch (ace_type) {
116			case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
117			case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
118			case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
119			case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
120				entry_size = zfs_layout ?
121				    sizeof (zfs_object_ace_t) :
122				    sizeof (ace_object_t);
123				break;
124			default:
125				entry_size = zfs_layout ? sizeof (zfs_ace_t) :
126				    sizeof (ace_t);
127				break;
128			}
129		}
130		ptr = ptr + entry_size;
131	}
132}
133
134/* ARGSUSED */
135void
136zfs_oldacl_byteswap(void *buf, size_t size)
137{
138	int cnt;
139
140	/*
141	 * Arggh, since we don't know how many ACEs are in
142	 * the array, we have to swap the entire block
143	 */
144
145	cnt = size / sizeof (ace_t);
146
147	zfs_oldace_byteswap((ace_t *)buf, cnt);
148}
149
150/* ARGSUSED */
151void
152zfs_acl_byteswap(void *buf, size_t size)
153{
154	zfs_ace_byteswap(buf, size, B_TRUE);
155}
156
157void
158zfs_znode_byteswap(void *buf, size_t size)
159{
160	znode_phys_t *zp = buf;
161
162	ASSERT(size >= sizeof (znode_phys_t));
163
164	zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
165	zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
166	zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
167	zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
168	zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
169	zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
170	zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
171	zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
172	zp->zp_gen = BSWAP_64(zp->zp_gen);
173	zp->zp_mode = BSWAP_64(zp->zp_mode);
174	zp->zp_size = BSWAP_64(zp->zp_size);
175	zp->zp_parent = BSWAP_64(zp->zp_parent);
176	zp->zp_links = BSWAP_64(zp->zp_links);
177	zp->zp_xattr = BSWAP_64(zp->zp_xattr);
178	zp->zp_rdev = BSWAP_64(zp->zp_rdev);
179	zp->zp_flags = BSWAP_64(zp->zp_flags);
180	zp->zp_uid = BSWAP_64(zp->zp_uid);
181	zp->zp_gid = BSWAP_64(zp->zp_gid);
182	zp->zp_zap = BSWAP_64(zp->zp_zap);
183	zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
184	zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
185	zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
186
187	zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
188	zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
189	zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
190	zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
191	if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
192		zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
193		    ZFS_ACE_SPACE);
194	} else {
195		zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
196		    ACE_SLOT_CNT);
197	}
198}
199