type.c revision 110066 
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 110066 2003-01-29 23:19:46Z 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/* Track if its fd points to a writable device. */
54#define	MINE_WRITE	0x02
55
56struct uufsd *
57ufs_disk_ctor(const char *name)
58{
59	struct uufsd *new;
60
61	new = NULL;
62
63	ERROR(new, NULL);
64
65	new = malloc(sizeof(*new));
66	if (new == NULL) {
67		ERROR(new, "unable to allocate memory for disk");
68		return NULL;
69	}
70
71	if (ufs_disk_fillout(new, name) == -1) {
72		ERROR(new, "could not fill out disk");
73		free(new);
74		return NULL;
75	}
76
77	return new;
78}
79
80void
81ufs_disk_dtor(struct uufsd **diskp)
82{
83	struct uufsd *disk;
84
85	if (diskp != NULL)
86		disk = *diskp;
87	else
88		return;
89
90	ERROR(disk, NULL);
91
92	ufs_disk_close(disk);
93	free(disk);
94	*diskp = NULL;
95}
96
97int
98ufs_disk_close(struct uufsd *disk)
99{
100	ERROR(disk, NULL);
101	close(disk->d_fd);
102	if (disk->d_inoblock != NULL) {
103		free(disk->d_inoblock);
104		disk->d_inoblock = NULL;
105	}
106	if (disk->d_mine & MINE_NAME) {
107		free((char *)(uintptr_t)disk->d_name);
108		disk->d_name = NULL;
109	}
110	return 0;
111}
112
113int
114ufs_disk_fillout(struct uufsd *disk, const char *name)
115{
116	if (ufs_disk_fillout_blank(disk, name) == -1) {
117		return -1;
118	}
119	if (sbread(disk) == -1) {
120		ERROR(disk, "could not read superblock to fill out disk");
121		return -1;
122	}
123}
124
125int
126ufs_disk_fillout_blank(struct uufsd *disk, const char *name)
127{
128	struct stat st;
129	struct fstab *fs;
130	const char *oname;
131	char dev[MAXPATHLEN];
132	int fd;
133
134	ERROR(disk, NULL);
135
136	oname = name;
137	fs = getfsfile(name);
138	if (fs != NULL)
139		name = fs->fs_spec;
140again:	if (stat(name, &st) < 0) {
141		if (*name != '/') {
142			if (*name == 'r')
143				name++;
144			snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name);
145			name = dev;
146			goto again;
147		}
148		ERROR(disk, "could not find special device");
149		return -1;
150	}
151	fd = open(name, O_RDONLY);
152	if (fd == -1) {
153		ERROR(disk, "could not open special device");
154		return -1;
155	}
156
157	disk->d_bsize = 1;
158	disk->d_ccg = 0;
159	disk->d_fd = fd;
160	disk->d_inoblock = NULL;
161	disk->d_inomin = 0;
162	disk->d_inomax = 0;
163	disk->d_lcg = 0;
164	disk->d_mine = 0;
165	disk->d_ufs = 0;
166	disk->d_error = NULL;
167
168	if (oname != name) {
169		name = strdup(name);
170		if (name == NULL) {
171			ERROR(disk, "could not allocate memory for disk name");
172			return -1;
173		}
174		disk->d_mine |= MINE_NAME;
175	}
176	disk->d_name = name;
177
178	return 0;
179}
180
181int
182ufs_disk_write(struct uufsd *disk)
183{
184	int rofd;
185
186	ERROR(disk, NULL);
187
188	if (disk->d_mine & MINE_WRITE)
189		return 0;
190
191	rofd = disk->d_fd;
192
193	disk->d_fd = open(disk->d_name, O_RDWR);
194	if (disk->d_fd < 0) {
195		ERROR(disk, "failed to open disk for writing");
196		disk->d_fd = rofd;
197		return -1;
198	}
199
200	disk->d_mine |= MINE_WRITE;
201
202	return 0;
203}
204