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[FreeBSD/releng/10.0.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 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 void
34 zfs_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  */
49 void
50 zfs_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 */
136 void
137 zfs_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 */
152 void
153 zfs_acl_byteswap(void *buf, size_t size)
154 {
155         zfs_ace_byteswap(buf, size, B_TRUE);
156 }
157
158 void
159 zfs_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 }