Annotation of src/sys/ufs/ffs/ffs_appleufs.c, Revision 1.9.60.1
1.9.60.1! yamt 1: /* $NetBSD: ffs_appleufs.c,v 1.9 2006/06/11 09:26:04 kardel Exp $ */
1.3 thorpej 2:
1.1 dbj 3: /*
4: * Copyright (c) 2002 Darrin B. Jewell
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: *
16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26: */
27:
28: #include <sys/cdefs.h>
1.9.60.1! yamt 29: __KERNEL_RCSID(0, "$NetBSD: ffs_appleufs.c,v 1.9 2006/06/11 09:26:04 kardel Exp $");
1.1 dbj 30:
31: #include <sys/param.h>
32: #include <sys/time.h>
33: #if defined(_KERNEL)
34: #include <sys/kernel.h>
35: #include <sys/systm.h>
36: #endif
37:
38: #include <ufs/ufs/dinode.h>
39: #include <ufs/ufs/ufs_bswap.h>
40: #include <ufs/ffs/fs.h>
41: #include <ufs/ffs/ffs_extern.h>
42:
43: #if !defined(_KERNEL) && !defined(STANDALONE)
44: #include <stddef.h>
45: #include <stdio.h>
46: #include <stdlib.h>
47: #include <string.h>
48: #include <errno.h>
49: #include <assert.h>
50: #define KASSERT(x) assert(x)
51: #endif
52:
53: /*
54: * this is the same calculation as in_cksum
55: */
56: u_int16_t
1.7 thorpej 57: ffs_appleufs_cksum(const struct appleufslabel *appleufs)
1.1 dbj 58: {
59: const u_int16_t *p = (const u_int16_t *)appleufs;
1.5 dbj 60: int len = APPLEUFS_LABEL_SIZE; /* sizeof(struct appleufslabel) */
1.1 dbj 61: long res = 0;
62: while (len > 1) {
63: res += *p++;
64: len -= 2;
65: }
1.5 dbj 66: #if 0 /* APPLEUFS_LABEL_SIZE is guaranteed to be even */
1.1 dbj 67: if (len == 1)
1.2 dbj 68: res += htobe16(*(u_char *)p<<8);
1.1 dbj 69: #endif
70: res = (res >> 16) + (res & 0xffff);
71: res += (res >> 16);
72: return (~res);
73: }
74:
75: /* copies o to n, validating and byteswapping along the way
76: * returns 0 if ok, EINVAL if not valid
77: */
78: int
1.7 thorpej 79: ffs_appleufs_validate(const char *name, const struct appleufslabel *o,
80: struct appleufslabel *n)
1.1 dbj 81: {
82: struct appleufslabel tmp;
83: if (!n) n = &tmp;
84:
1.2 dbj 85: if (o->ul_magic != be32toh(APPLEUFS_LABEL_MAGIC)) {
1.1 dbj 86: return EINVAL;
87: }
88: *n = *o;
89: n->ul_checksum = 0;
90: n->ul_checksum = ffs_appleufs_cksum(n);
91: if (n->ul_checksum != o->ul_checksum) {
92: #if defined(DIAGNOSTIC) || !defined(_KERNEL)
93: printf("%s: invalid APPLE UFS checksum. found 0x%x, expecting 0x%x",
94: name,o->ul_checksum,n->ul_checksum);
95: #endif
96: return EINVAL;
97: }
1.2 dbj 98: n->ul_magic = be32toh(o->ul_magic);
99: n->ul_version = be32toh(o->ul_version);
100: n->ul_time = be32toh(o->ul_time);
101: n->ul_namelen = be16toh(o->ul_namelen);
1.1 dbj 102:
103: if (n->ul_namelen > APPLEUFS_MAX_LABEL_NAME) {
104: #if defined(DIAGNOSTIC) || !defined(_KERNEL)
105: printf("%s: APPLE UFS label name too long, truncated.\n",
106: name);
107: #endif
108: n->ul_namelen = APPLEUFS_MAX_LABEL_NAME;
109: }
1.5 dbj 110: /* if len is max, will set ul_unused1 */
1.6 perry 111: n->ul_name[n->ul_namelen] = '\0';
1.5 dbj 112:
1.1 dbj 113: #ifdef DEBUG
1.5 dbj 114: printf("%s: found APPLE UFS label v%d: \"%s\"\n",
115: name,n->ul_version,n->ul_name);
1.1 dbj 116: #endif
1.4 dbj 117: n->ul_uuid = be64toh(o->ul_uuid);
1.6 perry 118:
1.1 dbj 119: return 0;
120: }
121:
122: void
1.7 thorpej 123: ffs_appleufs_set(struct appleufslabel *appleufs, const char *name, time_t t,
124: uint64_t uuid)
1.1 dbj 125: {
126: size_t namelen;
127: if (!name) name = "untitled";
128: if (t == ((time_t)-1)) {
129: #if defined(_KERNEL)
1.9 kardel 130: t = time_second;
1.1 dbj 131: #elif defined(STANDALONE)
132: t = 0;
133: #else
134: (void)time(&t);
135: #endif
136: }
1.4 dbj 137: if (uuid == 0) {
138: #if defined(_KERNEL) && !defined(STANDALONE)
139: uuid = arc4random();
140: uuid <<= 32;
141: uuid |= arc4random();
142: #endif
143: }
1.1 dbj 144: namelen = strlen(name);
145: if (namelen > APPLEUFS_MAX_LABEL_NAME)
146: namelen = APPLEUFS_MAX_LABEL_NAME;
1.5 dbj 147: memset(appleufs, 0, APPLEUFS_LABEL_SIZE);
1.2 dbj 148: appleufs->ul_magic = htobe32(APPLEUFS_LABEL_MAGIC);
149: appleufs->ul_version = htobe32(APPLEUFS_LABEL_VERSION);
150: appleufs->ul_time = htobe32((u_int32_t)t);
151: appleufs->ul_namelen = htobe16(namelen);
1.1 dbj 152: strncpy(appleufs->ul_name,name,namelen);
1.4 dbj 153: appleufs->ul_uuid = htobe64(uuid);
1.1 dbj 154: appleufs->ul_checksum = ffs_appleufs_cksum(appleufs);
155: }
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