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 2010 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_sa.h>
31#include <sys/zfs_acl.h>
32
33void
34zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
35{
36	int i;
37
38	for (i = 0; i != ace_cnt; i++, ace++) {
39		ace->a_who = BSWAP_32(ace->a_who);
40		ace->a_access_mask = BSWAP_32(ace->a_access_mask);
41		ace->a_flags = BSWAP_16(ace->a_flags);
42		ace->a_type = BSWAP_16(ace->a_type);
43	}
44}
45
46/*
47 * swap ace_t and ace_oject_t
48 */
49void
50zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
51{
52	caddr_t end;
53	caddr_t ptr;
54	zfs_ace_t *zacep = NULL;
55	ace_t *acep;
56	uint16_t entry_type;
57	size_t entry_size;
58	int ace_type;
59
60	end = (caddr_t)buf + size;
61	ptr = buf;
62
63	while (ptr < end) {
64		if (zfs_layout) {
65			/*
66			 * Avoid overrun.  Embedded aces can have one
67			 * of several sizes.  We don't know exactly
68			 * how many our present, only the size of the
69			 * buffer containing them.  That size may be
70			 * larger than needed to hold the aces
71			 * present.  As long as we do not do any
72			 * swapping beyond the end of our block we are
73			 * okay.  It it safe to swap any non-ace data
74			 * within the block since it is just zeros.
75			 */
76			if (ptr + sizeof (zfs_ace_hdr_t) > end) {
77				break;
78			}
79			zacep = (zfs_ace_t *)ptr;
80			zacep->z_hdr.z_access_mask =
81			    BSWAP_32(zacep->z_hdr.z_access_mask);
82			zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
83			ace_type = zacep->z_hdr.z_type =
84			    BSWAP_16(zacep->z_hdr.z_type);
85			entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
86		} else {
87			/* Overrun avoidance */
88			if (ptr + sizeof (ace_t) > end) {
89				break;
90			}
91			acep = (ace_t *)ptr;
92			acep->a_access_mask = BSWAP_32(acep->a_access_mask);
93			acep->a_flags = BSWAP_16(acep->a_flags);
94			ace_type = acep->a_type = BSWAP_16(acep->a_type);
95			acep->a_who = BSWAP_32(acep->a_who);
96			entry_type = acep->a_flags & ACE_TYPE_FLAGS;
97		}
98		switch (entry_type) {
99		case ACE_OWNER:
100		case ACE_EVERYONE:
101		case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
102			entry_size = zfs_layout ?
103			    sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
104			break;
105		case ACE_IDENTIFIER_GROUP:
106		default:
107			/* Overrun avoidance */
108			if (zfs_layout) {
109				if (ptr + sizeof (zfs_ace_t) <= end) {
110					zacep->z_fuid = BSWAP_64(zacep->z_fuid);
111				} else {
112					entry_size = sizeof (zfs_ace_t);
113					break;
114				}
115			}
116			switch (ace_type) {
117			case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
118			case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
119			case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
120			case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
121				entry_size = zfs_layout ?
122				    sizeof (zfs_object_ace_t) :
123				    sizeof (ace_object_t);
124				break;
125			default:
126				entry_size = zfs_layout ? sizeof (zfs_ace_t) :
127				    sizeof (ace_t);
128				break;
129			}
130		}
131		ptr = ptr + entry_size;
132	}
133}
134
135/* ARGSUSED */
136void
137zfs_oldacl_byteswap(void *buf, size_t size)
138{
139	int cnt;
140
141	/*
142	 * Arggh, since we don't know how many ACEs are in
143	 * the array, we have to swap the entire block
144	 */
145
146	cnt = size / sizeof (ace_t);
147
148	zfs_oldace_byteswap((ace_t *)buf, cnt);
149}
150
151/* ARGSUSED */
152void
153zfs_acl_byteswap(void *buf, size_t size)
154{
155	zfs_ace_byteswap(buf, size, B_TRUE);
156}
157
158void
159zfs_znode_byteswap(void *buf, size_t size)
160{
161	znode_phys_t *zp = buf;
162
163	ASSERT(size >= sizeof (znode_phys_t));
164
165	zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
166	zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
167	zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
168	zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
169	zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
170	zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
171	zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
172	zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
173	zp->zp_gen = BSWAP_64(zp->zp_gen);
174	zp->zp_mode = BSWAP_64(zp->zp_mode);
175	zp->zp_size = BSWAP_64(zp->zp_size);
176	zp->zp_parent = BSWAP_64(zp->zp_parent);
177	zp->zp_links = BSWAP_64(zp->zp_links);
178	zp->zp_xattr = BSWAP_64(zp->zp_xattr);
179	zp->zp_rdev = BSWAP_64(zp->zp_rdev);
180	zp->zp_flags = BSWAP_64(zp->zp_flags);
181	zp->zp_uid = BSWAP_64(zp->zp_uid);
182	zp->zp_gid = BSWAP_64(zp->zp_gid);
183	zp->zp_zap = BSWAP_64(zp->zp_zap);
184	zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
185	zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
186	zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
187
188	zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
189	zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
190	zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
191	zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
192	if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
193		zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
194		    ZFS_ACE_SPACE);
195	} else {
196		zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
197		    ACE_SLOT_CNT);
198	}
199}
200