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("$FreeBSD$");
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
56 int
ufs_disk_close(struct uufsd * disk)57 ufs_disk_close(struct uufsd *disk)
58 {
59 ERROR(disk, NULL);
60 close(disk->d_fd);
61 if (disk->d_inoblock != NULL) {
62 free(disk->d_inoblock);
63 disk->d_inoblock = NULL;
64 }
65 if (disk->d_mine & MINE_NAME) {
66 free((char *)(uintptr_t)disk->d_name);
67 disk->d_name = NULL;
68 }
69 if (disk->d_sbcsum != NULL) {
70 free(disk->d_sbcsum);
71 disk->d_sbcsum = NULL;
72 }
73 return (0);
74 }
75
76 int
ufs_disk_fillout(struct uufsd * disk,const char * name)77 ufs_disk_fillout(struct uufsd *disk, const char *name)
78 {
79 if (ufs_disk_fillout_blank(disk, name) == -1) {
80 return (-1);
81 }
82 if (sbread(disk) == -1) {
83 ERROR(disk, "could not read superblock to fill out disk");
84 return (-1);
85 }
86 return (0);
87 }
88
89 int
ufs_disk_fillout_blank(struct uufsd * disk,const char * name)90 ufs_disk_fillout_blank(struct uufsd *disk, const char *name)
91 {
92 struct stat st;
93 struct fstab *fs;
94 struct statfs sfs;
95 const char *oname;
96 char dev[MAXPATHLEN];
97 int fd, ret;
98
99 ERROR(disk, NULL);
100
101 oname = name;
102 again: if ((ret = stat(name, &st)) < 0) {
103 if (*name != '/') {
104 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name);
105 name = dev;
106 goto again;
107 }
108 /*
109 * The given object doesn't exist, but don't panic just yet -
110 * it may be still mount point listed in /etc/fstab, but without
111 * existing corresponding directory.
112 */
113 name = oname;
114 }
115 if (ret >= 0 && S_ISREG(st.st_mode)) {
116 /* Possibly a disk image, give it a try. */
117 ;
118 } else if (ret >= 0 && S_ISCHR(st.st_mode)) {
119 /* This is what we need, do nothing. */
120 ;
121 } else if ((fs = getfsfile(name)) != NULL) {
122 /*
123 * The given mount point is listed in /etc/fstab.
124 * It is possible that someone unmounted file system by hand
125 * and different file system is mounted on this mount point,
126 * but we still prefer /etc/fstab entry, because on the other
127 * hand, there could be /etc/fstab entry for this mount
128 * point, but file system is not mounted yet (eg. noauto) and
129 * statfs(2) will point us at different file system.
130 */
131 name = fs->fs_spec;
132 } else if (ret >= 0 && S_ISDIR(st.st_mode)) {
133 /*
134 * The mount point is not listed in /etc/fstab, so it may be
135 * file system mounted by hand.
136 */
137 if (statfs(name, &sfs) < 0) {
138 ERROR(disk, "could not find special device");
139 return (-1);
140 }
141 strlcpy(dev, sfs.f_mntfromname, sizeof(dev));
142 name = dev;
143 } else {
144 ERROR(disk, "could not find special device");
145 return (-1);
146 }
147 fd = open(name, O_RDONLY);
148 if (fd == -1) {
149 ERROR(disk, "could not open special device");
150 return (-1);
151 }
152
153 disk->d_bsize = 1;
154 disk->d_ccg = 0;
155 disk->d_fd = fd;
156 disk->d_inoblock = NULL;
157 disk->d_inomin = 0;
158 disk->d_inomax = 0;
159 disk->d_lcg = 0;
160 disk->d_mine = 0;
161 disk->d_ufs = 0;
162 disk->d_error = NULL;
163 disk->d_sbcsum = NULL;
164
165 if (oname != name) {
166 name = strdup(name);
167 if (name == NULL) {
168 ERROR(disk, "could not allocate memory for disk name");
169 return (-1);
170 }
171 disk->d_mine |= MINE_NAME;
172 }
173 disk->d_name = name;
174
175 return (0);
176 }
177
178 int
ufs_disk_write(struct uufsd * disk)179 ufs_disk_write(struct uufsd *disk)
180 {
181 ERROR(disk, NULL);
182
183 if (disk->d_mine & MINE_WRITE)
184 return (0);
185
186 close(disk->d_fd);
187
188 disk->d_fd = open(disk->d_name, O_RDWR);
189 if (disk->d_fd < 0) {
190 ERROR(disk, "failed to open disk for writing");
191 return (-1);
192 }
193
194 disk->d_mine |= MINE_WRITE;
195
196 return (0);
197 }
198