Make sure we are not trying to clone a spill block.
[zfs.git] / module / zfs / zfs_byteswap.c
blob8666883f09a25b5f306da4dc65babf0fec788113
1 /*
2 * CDDL HEADER START
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.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
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]
19 * CDDL HEADER END
22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
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>
33 #ifndef _KERNEL
34 static
35 #endif
36 void
37 zfs_oldace_byteswap(ace_t *ace, int ace_cnt)
39 for (int i = 0; i != ace_cnt; i++, ace++) {
40 ace->a_who = BSWAP_32(ace->a_who);
41 ace->a_access_mask = BSWAP_32(ace->a_access_mask);
42 ace->a_flags = BSWAP_16(ace->a_flags);
43 ace->a_type = BSWAP_16(ace->a_type);
48 * swap ace_t and ace_object_t
50 #ifndef _KERNEL
51 static
52 #endif
53 void
54 zfs_ace_byteswap(void *buf, size_t size, boolean_t zfs_layout)
56 caddr_t end;
57 caddr_t ptr;
58 zfs_ace_t *zacep = NULL;
59 ace_t *acep;
60 uint16_t entry_type;
61 size_t entry_size;
62 int ace_type;
64 end = (caddr_t)buf + size;
65 ptr = buf;
67 while (ptr < end) {
68 if (zfs_layout) {
70 * Avoid overrun. Embedded aces can have one
71 * of several sizes. We don't know exactly
72 * how many our present, only the size of the
73 * buffer containing them. That size may be
74 * larger than needed to hold the aces
75 * present. As long as we do not do any
76 * swapping beyond the end of our block we are
77 * okay. It is safe to swap any non-ace data
78 * within the block since it is just zeros.
80 if (ptr + sizeof (zfs_ace_hdr_t) > end) {
81 break;
83 zacep = (zfs_ace_t *)ptr;
84 zacep->z_hdr.z_access_mask =
85 BSWAP_32(zacep->z_hdr.z_access_mask);
86 zacep->z_hdr.z_flags = BSWAP_16(zacep->z_hdr.z_flags);
87 ace_type = zacep->z_hdr.z_type =
88 BSWAP_16(zacep->z_hdr.z_type);
89 entry_type = zacep->z_hdr.z_flags & ACE_TYPE_FLAGS;
90 } else {
91 /* Overrun avoidance */
92 if (ptr + sizeof (ace_t) > end) {
93 break;
95 acep = (ace_t *)ptr;
96 acep->a_access_mask = BSWAP_32(acep->a_access_mask);
97 acep->a_flags = BSWAP_16(acep->a_flags);
98 ace_type = acep->a_type = BSWAP_16(acep->a_type);
99 acep->a_who = BSWAP_32(acep->a_who);
100 entry_type = acep->a_flags & ACE_TYPE_FLAGS;
102 switch (entry_type) {
103 case ACE_OWNER:
104 case ACE_EVERYONE:
105 case (ACE_IDENTIFIER_GROUP | ACE_GROUP):
106 entry_size = zfs_layout ?
107 sizeof (zfs_ace_hdr_t) : sizeof (ace_t);
108 break;
109 case ACE_IDENTIFIER_GROUP:
110 default:
111 /* Overrun avoidance */
112 if (zfs_layout) {
113 if (ptr + sizeof (zfs_ace_t) <= end) {
114 zacep->z_fuid = BSWAP_64(zacep->z_fuid);
115 } else {
116 entry_size = sizeof (zfs_ace_t);
117 break;
120 switch (ace_type) {
121 case ACE_ACCESS_ALLOWED_OBJECT_ACE_TYPE:
122 case ACE_ACCESS_DENIED_OBJECT_ACE_TYPE:
123 case ACE_SYSTEM_AUDIT_OBJECT_ACE_TYPE:
124 case ACE_SYSTEM_ALARM_OBJECT_ACE_TYPE:
125 entry_size = zfs_layout ?
126 sizeof (zfs_object_ace_t) :
127 sizeof (ace_object_t);
128 break;
129 default:
130 entry_size = zfs_layout ? sizeof (zfs_ace_t) :
131 sizeof (ace_t);
132 break;
135 ptr = ptr + entry_size;
139 void
140 zfs_oldacl_byteswap(void *buf, size_t size)
143 * Arggh, since we don't know how many ACEs are in
144 * the array, we have to swap the entire block
146 zfs_oldace_byteswap((ace_t *)buf, size / sizeof (ace_t));
149 void
150 zfs_acl_byteswap(void *buf, size_t size)
152 zfs_ace_byteswap(buf, size, B_TRUE);
155 void
156 zfs_znode_byteswap(void *buf, size_t size)
158 znode_phys_t *zp = buf;
160 ASSERT(size >= sizeof (znode_phys_t));
162 zp->zp_crtime[0] = BSWAP_64(zp->zp_crtime[0]);
163 zp->zp_crtime[1] = BSWAP_64(zp->zp_crtime[1]);
164 zp->zp_atime[0] = BSWAP_64(zp->zp_atime[0]);
165 zp->zp_atime[1] = BSWAP_64(zp->zp_atime[1]);
166 zp->zp_mtime[0] = BSWAP_64(zp->zp_mtime[0]);
167 zp->zp_mtime[1] = BSWAP_64(zp->zp_mtime[1]);
168 zp->zp_ctime[0] = BSWAP_64(zp->zp_ctime[0]);
169 zp->zp_ctime[1] = BSWAP_64(zp->zp_ctime[1]);
170 zp->zp_gen = BSWAP_64(zp->zp_gen);
171 zp->zp_mode = BSWAP_64(zp->zp_mode);
172 zp->zp_size = BSWAP_64(zp->zp_size);
173 zp->zp_parent = BSWAP_64(zp->zp_parent);
174 zp->zp_links = BSWAP_64(zp->zp_links);
175 zp->zp_xattr = BSWAP_64(zp->zp_xattr);
176 zp->zp_rdev = BSWAP_64(zp->zp_rdev);
177 zp->zp_flags = BSWAP_64(zp->zp_flags);
178 zp->zp_uid = BSWAP_64(zp->zp_uid);
179 zp->zp_gid = BSWAP_64(zp->zp_gid);
180 zp->zp_zap = BSWAP_64(zp->zp_zap);
181 zp->zp_pad[0] = BSWAP_64(zp->zp_pad[0]);
182 zp->zp_pad[1] = BSWAP_64(zp->zp_pad[1]);
183 zp->zp_pad[2] = BSWAP_64(zp->zp_pad[2]);
185 zp->zp_acl.z_acl_extern_obj = BSWAP_64(zp->zp_acl.z_acl_extern_obj);
186 zp->zp_acl.z_acl_size = BSWAP_32(zp->zp_acl.z_acl_size);
187 zp->zp_acl.z_acl_version = BSWAP_16(zp->zp_acl.z_acl_version);
188 zp->zp_acl.z_acl_count = BSWAP_16(zp->zp_acl.z_acl_count);
189 if (zp->zp_acl.z_acl_version == ZFS_ACL_VERSION) {
190 zfs_acl_byteswap((void *)&zp->zp_acl.z_ace_data[0],
191 ZFS_ACE_SPACE);
192 } else {
193 zfs_oldace_byteswap((ace_t *)&zp->zp_acl.z_ace_data[0],
194 ACE_SLOT_CNT);
198 #if defined(_KERNEL)
199 EXPORT_SYMBOL(zfs_oldacl_byteswap);
200 EXPORT_SYMBOL(zfs_acl_byteswap);
201 EXPORT_SYMBOL(zfs_znode_byteswap);
202 #endif