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
33 #ifndef _KERNEL
34 static
35 #endif
36 void
zfs_oldace_byteswap(ace_t * ace,int ace_cnt)37 zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
38 {
39 int i;
40
41 for (i = 0; i != ace_cnt; i++, ace++) {
42 ace->a_who = BSWAP_32(ace->a_who);
43 ace->a_access_mask = BSWAP_32(ace->a_access_mask);
44 ace->a_flags = BSWAP_16(ace->a_flags);
45 ace->a_type = BSWAP_16(ace->a_type);
46 }
47 }
48
49 /*
50 * swap ace_t and ace_object_t
51 */
52 #ifndef _KERNEL
53 static
54 #endif
55 void
zfs_ace_byteswap(void * buf,size_t size,boolean_t zfs_layout)56 zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
57 {
58 caddr_t end;
59 caddr_t ptr;
60 zfs_ace_t *zacep = NULL;
61 ace_t *acep;
62 uint16_t entry_type;
63 size_t entry_size;
64 int ace_type;
65
66 end = (caddr_t)buf + size;
67 ptr = buf;
68
69 while (ptr < end) {
70 if (zfs_layout) {
71 /*
72 * Avoid overrun. Embedded aces can have one
73 * of several sizes. We don't know exactly
74 * how many our present, only the size of the
75 * buffer containing them. That size may be
76 * larger than needed to hold the aces
77 * present. As long as we do not do any
78 * swapping beyond the end of our block we are
79 * okay. It is safe to swap any non-ace data
80 * within the block since it is just zeros.
81 */
82 if (ptr + sizeof (zfs_ace_hdr_t) > end) {
83 break;
84 }
85 zacep = (zfs_ace_t *)ptr;
86 zacep->z_hdr.z_access_mask =
87 BSWAP_32(zacep->z_hdr.z_access_mask);
88 zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
89 ace_type = zacep->z_hdr.z_type =
90 BSWAP_16(zacep->z_hdr.z_type);
91 entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
92 } else {
93 /* Overrun avoidance */
94 if (ptr + sizeof (ace_t) > end) {
95 break;
96 }
97 acep = (ace_t *)ptr;
98 acep->a_access_mask = BSWAP_32(acep->a_access_mask);
99 acep->a_flags = BSWAP_16(acep->a_flags);
100 ace_type = acep->a_type = BSWAP_16(acep->a_type);
101 acep->a_who = BSWAP_32(acep->a_who);
102 entry_type = acep->a_flags & ACE_TYPE_FLAGS;
103 }
104 switch (entry_type) {
105 case ACE_OWNER:
106 case ACE_EVERYONE:
107 case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
108 entry_size = zfs_layout ?
109 sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
110 break;
111 case ACE_IDENTIFIER_GROUP:
112 default:
113 /* Overrun avoidance */
114 if (zfs_layout) {
115 if (ptr + sizeof (zfs_ace_t) <= end) {
116 zacep->z_fuid = BSWAP_64(zacep->z_fuid);
117 } else {
118 entry_size = sizeof (zfs_ace_t);
119 break;
120 }
121 }
122 switch (ace_type) {
123 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
124 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
125 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
126 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
127 entry_size = zfs_layout ?
128 sizeof (zfs_object_ace_t) :
129 sizeof (ace_object_t);
130 break;
131 default:
132 entry_size = zfs_layout ? sizeof (zfs_ace_t) :
133 sizeof (ace_t);
134 break;
135 }
136 }
137 ptr = ptr + entry_size;
138 }
139 }
140
141 /* ARGSUSED */
142 void
zfs_oldacl_byteswap(void * buf,size_t size)143 zfs_oldacl_byteswap(void *buf, size_t size)
144 {
145 int cnt;
146
147 /*
148 * Arggh, since we don't know how many ACEs are in
149 * the array, we have to swap the entire block
150 */
151
152 cnt = size / sizeof (ace_t);
153
154 zfs_oldace_byteswap((ace_t *)buf, cnt);
155 }
156
157 /* ARGSUSED */
158 void
zfs_acl_byteswap(void * buf,size_t size)159 zfs_acl_byteswap(void *buf, size_t size)
160 {
161 zfs_ace_byteswap(buf, size, B_TRUE);
162 }
163
164 void
zfs_znode_byteswap(void * buf,size_t size)165 zfs_znode_byteswap(void *buf, size_t size)
166 {
167 znode_phys_t *zp = buf;
168
169 ASSERT(size >= sizeof (znode_phys_t));
170
171 zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
172 zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
173 zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
174 zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
175 zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
176 zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
177 zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
178 zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
179 zp->zp_gen = BSWAP_64(zp->zp_gen);
180 zp->zp_mode = BSWAP_64(zp->zp_mode);
181 zp->zp_size = BSWAP_64(zp->zp_size);
182 zp->zp_parent = BSWAP_64(zp->zp_parent);
183 zp->zp_links = BSWAP_64(zp->zp_links);
184 zp->zp_xattr = BSWAP_64(zp->zp_xattr);
185 zp->zp_rdev = BSWAP_64(zp->zp_rdev);
186 zp->zp_flags = BSWAP_64(zp->zp_flags);
187 zp->zp_uid = BSWAP_64(zp->zp_uid);
188 zp->zp_gid = BSWAP_64(zp->zp_gid);
189 zp->zp_zap = BSWAP_64(zp->zp_zap);
190 zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
191 zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
192 zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
193
194 zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
195 zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
196 zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
197 zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
198 if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
199 zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
200 ZFS_ACE_SPACE);
201 } else {
202 zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
203 ACE_SLOT_CNT);
204 }
205 }
206
207 #if defined(_KERNEL)
208 EXPORT_SYMBOL(zfs_oldacl_byteswap);
209 EXPORT_SYMBOL(zfs_acl_byteswap);
210 EXPORT_SYMBOL(zfs_znode_byteswap);
211 #endif
212