1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2002 Juli Mallett. All rights reserved.
5 *
6 * This software was written by Juli Mallett <[email protected]> for the
7 * FreeBSD project. Redistribution and use in source and binary forms, with
8 * or without modification, are permitted provided that the following
9 * conditions are met:
10 *
11 * 1. Redistribution of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 * 2. Redistribution in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
26 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
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/extattr.h>
37 #include <ufs/ufs/quota.h>
38 #include <ufs/ufs/ufsmount.h>
39 #include <ufs/ufs/dinode.h>
40 #include <ufs/ffs/fs.h>
41
42 #include <errno.h>
43 #include <fcntl.h>
44 #include <fstab.h>
45 #include <paths.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #include <libufs.h>
52
53 /* Internally, track the 'name' value, it's ours. */
54 #define MINE_NAME 0x01
55 /* Track if its fd points to a writable device. */
56 #define MINE_WRITE 0x02
57
58 int
ufs_disk_close(struct uufsd * disk)59 ufs_disk_close(struct uufsd *disk)
60 {
61 ERROR(disk, NULL);
62 close(disk->d_fd);
63 disk->d_fd = -1;
64 if (disk->d_inoblock != NULL) {
65 free(disk->d_inoblock);
66 disk->d_inoblock = NULL;
67 }
68 if (disk->d_mine & MINE_NAME) {
69 free((char *)(uintptr_t)disk->d_name);
70 disk->d_name = NULL;
71 }
72 if (disk->d_si != NULL) {
73 free(disk->d_si->si_csp);
74 free(disk->d_si);
75 disk->d_si = NULL;
76 }
77 return (0);
78 }
79
80 int
ufs_disk_fillout(struct uufsd * disk,const char * name)81 ufs_disk_fillout(struct uufsd *disk, const char *name)
82 {
83 if (ufs_disk_fillout_blank(disk, name) == -1) {
84 return (-1);
85 }
86 if (sbread(disk) == -1) {
87 ERROR(disk, "could not read superblock to fill out disk");
88 ufs_disk_close(disk);
89 return (-1);
90 }
91 return (0);
92 }
93
94 int
ufs_disk_fillout_blank(struct uufsd * disk,const char * name)95 ufs_disk_fillout_blank(struct uufsd *disk, const char *name)
96 {
97 struct stat st;
98 struct fstab *fs;
99 struct statfs sfs;
100 const char *oname;
101 char dev[MAXPATHLEN];
102 int fd, ret;
103
104 ERROR(disk, NULL);
105
106 oname = name;
107 again: if ((ret = stat(name, &st)) < 0) {
108 if (*name != '/') {
109 snprintf(dev, sizeof(dev), "%s%s", _PATH_DEV, name);
110 name = dev;
111 goto again;
112 }
113 /*
114 * The given object doesn't exist, but don't panic just yet -
115 * it may be still mount point listed in /etc/fstab, but without
116 * existing corresponding directory.
117 */
118 name = oname;
119 }
120 if (ret >= 0 && S_ISREG(st.st_mode)) {
121 /* Possibly a disk image, give it a try. */
122 ;
123 } else if (ret >= 0 && S_ISCHR(st.st_mode)) {
124 /* This is what we need, do nothing. */
125 ;
126 } else if ((fs = getfsfile(name)) != NULL) {
127 /*
128 * The given mount point is listed in /etc/fstab.
129 * It is possible that someone unmounted file system by hand
130 * and different file system is mounted on this mount point,
131 * but we still prefer /etc/fstab entry, because on the other
132 * hand, there could be /etc/fstab entry for this mount
133 * point, but file system is not mounted yet (eg. noauto) and
134 * statfs(2) will point us at different file system.
135 */
136 name = fs->fs_spec;
137 } else if (ret >= 0 && S_ISDIR(st.st_mode)) {
138 /*
139 * The mount point is not listed in /etc/fstab, so it may be
140 * file system mounted by hand.
141 */
142 if (statfs(name, &sfs) < 0) {
143 ERROR(disk, "could not find special device");
144 return (-1);
145 }
146 strlcpy(dev, sfs.f_mntfromname, sizeof(dev));
147 name = dev;
148 } else {
149 ERROR(disk, "could not find special device");
150 return (-1);
151 }
152 fd = open(name, O_RDONLY);
153 if (fd == -1) {
154 ERROR(disk, "could not open special device");
155 return (-1);
156 }
157
158 disk->d_bsize = 1;
159 disk->d_ccg = 0;
160 disk->d_fd = fd;
161 disk->d_inoblock = NULL;
162 disk->d_inomin = 0;
163 disk->d_inomax = 0;
164 disk->d_lcg = 0;
165 disk->d_mine = 0;
166 disk->d_ufs = 0;
167 disk->d_error = NULL;
168 disk->d_si = NULL;
169 disk->d_sblockloc = UFS_STDSB;
170 disk->d_lookupflags = 0;
171
172 if (oname != name) {
173 name = strdup(name);
174 if (name == NULL) {
175 ERROR(disk, "could not allocate memory for disk name");
176 return (-1);
177 }
178 disk->d_mine |= MINE_NAME;
179 }
180 disk->d_name = name;
181
182 return (0);
183 }
184
185 int
ufs_disk_write(struct uufsd * disk)186 ufs_disk_write(struct uufsd *disk)
187 {
188 int fd;
189
190 ERROR(disk, NULL);
191
192 if (disk->d_mine & MINE_WRITE)
193 return (0);
194
195 fd = open(disk->d_name, O_RDWR);
196 if (fd < 0) {
197 ERROR(disk, "failed to open disk for writing");
198 return (-1);
199 }
200
201 close(disk->d_fd);
202 disk->d_fd = fd;
203 disk->d_mine |= MINE_WRITE;
204
205 return (0);
206 }
207