type.c revision 109506 
1/*
2 * Copyright (c) 2002 Juli Mallett.  All rights reserved.
3 *
4 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
5 * FreeBSD project.  Redistribution and use in source and binary forms, with
6 * or without modification, are permitted provided that the following
7 * conditions are met:
8 *
9 * 1. Redistribution of source code must retain the above copyright notice,
10 *    this list of conditions and the following disclaimer.
11 * 2. Redistribution in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: head/lib/libufs/type.c 109506 2003-01-19 00:43:17Z jmallett $");
30
31#include <sys/param.h>
32#include <sys/mount.h>
33#include <sys/disklabel.h>
34#include <sys/stat.h>
35
36#include <ufs/ufs/ufsmount.h>
37#include <ufs/ufs/dinode.h>
38#include <ufs/ffs/fs.h>
39
40#include <errno.h>
41#include <fcntl.h>
42#include <fstab.h>
43#include <paths.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <string.h>
47#include <unistd.h>
48
49#include <libufs.h>
50
51/* Internally, track the 'name' value, it's ours. */
52#define	MINE_NAME	0x01
53
54struct uufsd *
55ufs_disk_ctor(const char *name)
56{
57	struct uufsd *new;
58
59	new = NULL;
60
61	ERROR(new, NULL);
62
63	new = malloc(sizeof(*new));
64	if (new == NULL) {
65		ERROR(new, "unable to allocate memory for disk");
66		return NULL;
67	}
68
69	if (ufs_disk_fillout(new, name) == -1) {
70		ERROR(new, "could not fill out disk");
71		free(new);
72		return NULL;
73	}
74
75	return new;
76}
77
78void
79ufs_disk_dtor(struct uufsd **diskp)
80{
81	struct uufsd *disk;
82
83	if (diskp != NULL)
84		disk = *diskp;
85	else
86		return;
87
88	ERROR(disk, NULL);
89
90	ufs_disk_close(disk);
91	free(disk);
92	*diskp = NULL;
93}
94
95int
96ufs_disk_close(struct uufsd *disk)
97{
98	ERROR(disk, NULL);
99	close(disk->d_fd);
100	if (disk->d_inoblock != NULL) {
101		free(disk->d_inoblock);
102		disk->d_inoblock = NULL;
103	}
104	if (disk->d_mine & MINE_NAME) {
105		free((char *)(uintptr_t)disk->d_name);
106		disk->d_name = NULL;
107	}
108	return 0;
109}
110
111int
112ufs_disk_fillout(struct uufsd *disk, const char *name)
113{
114	struct stat st;
115	struct fstab *fs;
116	const char *oname;
117	char dev[MAXPATHLEN];
118	int fd;
119
120	ERROR(disk, NULL);
121
122	oname = name;
123	fs = getfsfile(name);
124	if (fs != NULL)
125		name = fs->fs_spec;
126again:	if (stat(name, &st) < 0) {
127		if (*name != '/') {
128			if (*name == 'r')
129				name++;
130			snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name);
131			name = dev;
132			goto again;
133		}
134		ERROR(disk, "could not find special device");
135		return -1;
136	}
137	fd = open(name, O_RDONLY);
138	if (fd == -1) {
139		ERROR(disk, "could not open special device");
140		return -1;
141	}
142
143	disk->d_bsize = 1;
144	disk->d_fd = fd;
145	disk->d_inoblock = NULL;
146	disk->d_inomin = 0;
147	disk->d_inomax = 0;
148	disk->d_mine = 0;
149	disk->d_ufs = 0;
150	disk->d_error = NULL;
151
152	if (oname != name) {
153		name = strdup(name);
154		if (name == NULL) {
155			ERROR(disk, "could not allocate memory for disk name");
156			return -1;
157		}
158		disk->d_mine |= MINE_NAME;
159	}
160	disk->d_name = name;
161
162	if (sbread(disk) == -1) {
163		ERROR(disk, "could not read superblock to fill out disk");
164		return -1;
165	}
166
167	return 0;
168}
169