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[FreeBSD/releng/8.1.git] / sys / cddl / contrib / opensolaris / uts / common / fs / zfs / zfs_byteswap.c
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
32 void
33 zfs_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  */
48 void
49 zfs_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 */
135 void
136 zfs_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 */
151 void
152 zfs_acl_byteswap(void *buf, size_t size)
153 {
154         zfs_ace_byteswap(buf, size, B_TRUE);
155 }
156
157 void
158 zfs_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 }