1 /* vi:set cindent tabstop=2 shiftwidth=2: */
2 /*
3 * libvxfs - library for reading Veritas Journaled FileSystem (VxFS)
4 * Copyright (c) 1999 Martin Hinner <mhi@penguin.cz>
5 *
6 * block.c: VxFS block routines and UnixWare vtoc support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * $Id$
23 */
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <unistd.h>
27 #include <fcntl.h>
28
29 #include <libvxfs.h>
30
31 int vxfd;
32 int vxbsize;
33 long vxpartoffset;
34
35 int
vxopendev(char * device)36 vxopendev (char *device)
37 {
38 vxbsize = 1024;
39
40 vxfd = open (device, O_RDONLY);
41 if (vxfd < 0)
42 {
43 perror (device);
44 return -1;
45 }
46 return 0;
47 }
48
49 void
vxclosedev(void)50 vxclosedev (void)
51 {
52 if (vxfd >= 0)
53 {
54 close (vxfd);
55 vxfd = -1;
56 vxbsize = 0;
57 }
58 }
59
60 int
vxsetpart(int part)61 vxsetpart (int part)
62 {
63 struct uw_vtoc *vtoc;
64
65 if (part >= V_NUMPAR)
66 {
67 if (vxverbose)
68 fprintf (stderr, "vxsetpart: Invalid partition %u\n", part);
69 return -1;
70 }
71
72 vtoc = vxreaduwvtoc ();
73 if (vtoc == NULL)
74 {
75
76 /* No partition specified, silently ignore */
77 if (part == 0)
78 return 0;
79
80 if (vxverbose)
81 fprintf (stderr, "vxsetpart: vxreaduwvtoc returned NULL\n");
82 return -1;
83 }
84
85 if (vtoc->part[part].tag == V_UNUSED)
86 {
87 if (vxverbose)
88 fprintf (stderr, "vxsetpart: Attemp to mount unused partition\n");
89 return -1;
90 }
91
92 vxpartoffset = vtoc->part[part].start;
93
94 free (vtoc);
95 return 0;
96 }
97
98
99 struct uw_vtoc *
vxreaduwvtoc(void)100 vxreaduwvtoc (void)
101 {
102 struct uw_vtoc *vtoc;
103 struct uw_disklabel *disklabel;
104 struct uw_dospt *dospt;
105 int i,npart;
106
107 dospt = (struct uw_dospt *) malloc(VTOC_BSIZE);
108 if (!dospt) {
109 if (vxverbose)
110 fprintf(stderr,"vxreaduwvtoc: Not enough memory!\n");
111 return 0;
112 }
113
114 if (lseek (vxfd, 0 , SEEK_SET) < 0)
115 {
116 if (vxverbose)
117 perror ("vxreaduwvtoc: lseek");
118 return 0;
119 }
120
121 if (read (vxfd, dospt, VTOC_BSIZE) != VTOC_BSIZE)
122 {
123 if (vxverbose)
124 perror ("vxreaduwvtoc: read");
125 return 0;
126 }
127
128 npart = -1;
129 for (i=0;i<4;i++) {
130 if (dospt->part[i].sys_ind == VTOC_DOSTYPE)
131 npart = i;
132 }
133
134 if (npart == -1) {
135 if (vxverbose)
136 fprintf(stderr,"vxreaduwvtoc: No UnixWare partition found!\n");
137 free(dospt);
138 return 0;
139 }
140
141 disklabel = (struct uw_disklabel *) malloc (VTOC_BSIZE);
142 if (!disklabel)
143 {
144 if (vxverbose)
145 fprintf (stderr, "vxreaduwvtoc: Not enough memory!\n");
146 return 0;
147 }
148
149 if (lseek (vxfd, VTOC_BSIZE *
150 (dospt->part[npart].start_sect + VTOC_SECTOR), SEEK_SET) < 0)
151 {
152 if (vxverbose)
153 perror ("vxreaduwvtoc: lseek");
154 return 0;
155 }
156
157 if (read (vxfd, disklabel, VTOC_BSIZE) != VTOC_BSIZE)
158 {
159 if (vxverbose)
160 perror ("vxreaduwvtoc: read");
161 return 0;
162 }
163
164 if (disklabel->vtoc.sanity != VTOC_SANE)
165 {
166 free (disklabel);
167 return 0;
168 }
169
170 vtoc = (struct uw_vtoc*)malloc(sizeof(struct uw_vtoc));
171 if (vtoc == NULL) {
172 if (vxverbose)
173 fprintf (stderr, "vxreaduwvtoc: Not enough memory!\n");
174 return 0;
175 }
176
177 memcpy(vtoc, &disklabel->vtoc, sizeof(struct uw_vtoc));
178
179 free(disklabel);
180
181 return vtoc;
182 }
183
184 void *
vxread(int blknum,int count)185 vxread (int blknum, int count)
186 {
187 void *blk;
188
189 blk = malloc (vxbsize * count);
190 if (!blk)
191 {
192 if (vxverbose)
193 fprintf (stderr, "vxread(%u): Not enough memory!\n", blknum);
194 return 0;
195 }
196
197 if (lseek (vxfd, (VTOC_BSIZE * vxpartoffset) +
198 (blknum * vxbsize), SEEK_SET) < 0)
199 {
200 if (vxverbose)
201 perror ("vxread: lseek");
202 return 0;
203 }
204 if (read (vxfd, blk, vxbsize * count) != vxbsize * count)
205 {
206 if (vxverbose)
207 perror ("vxread: read");
208 return 0;
209 }
210 return blk;
211 }
212