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 <jmallett@FreeBSD.org> 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/param.h>
31 #include <sys/mount.h>
32 #include <sys/disklabel.h>
33 #include <sys/stat.h>
34
35 #include <ufs/ufs/extattr.h>
36 #include <ufs/ufs/quota.h>
37 #include <ufs/ufs/ufsmount.h>
38 #include <ufs/ufs/dinode.h>
39 #include <ufs/ffs/fs.h>
40
41 #include <errno.h>
42 #include <fcntl.h>
43 #include <fstab.h>
44 #include <paths.h>
45 #include <stdio.h>
46 #include <stdlib.h>
47 #include <string.h>
48 #include <unistd.h>
49
50 #include <libufs.h>
51
52 /* Internally, track the 'name' value, it's ours. */
53 #define MINE_NAME 0x01
54 /* Track if its fd points to a writable device. */
55 #define MINE_WRITE 0x02
56
57 int
ufs_disk_close(struct uufsd * disk)58 ufs_disk_close(struct uufsd *disk)
59 {
60 ERROR(disk, NULL);
61 close(disk->d_fd);
62 disk->d_fd = -1;
63 if (disk->d_mine & MINE_NAME) {
64 free((char *)(uintptr_t)disk->d_name);
65 disk->d_name = NULL;
66 }
67 if (disk->d_si != NULL) {
68 free(disk->d_si->si_csp);
69 free(disk->d_si);
70 disk->d_si = NULL;
71 }
72 return (0);
73 }
74
75 int
ufs_disk_fillout(struct uufsd * disk,const char * name)76 ufs_disk_fillout(struct uufsd *disk, const char *name)
77 {
78 if (ufs_disk_fillout_blank(disk, name) == -1) {
79 return (-1);
80 }
81 if (sbread(disk) == -1) {
82 ERROR(disk, "could not read superblock to fill out disk");
83 ufs_disk_close(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 if (((uintptr_t)disk & ~(LIBUFS_BUFALIGN - 1)) != (uintptr_t)disk) {
154 ERROR(disk, "uufsd structure must be aligned to "
155 "LIBUFS_BUFALIGN byte boundry, see ufs_disk_fillout(3)");
156 close(fd);
157 return (-1);
158 }
159
160 disk->d_bsize = 1;
161 disk->d_ccg = 0;
162 disk->d_fd = fd;
163 disk->d_inomin = 0;
164 disk->d_inomax = 0;
165 disk->d_lcg = 0;
166 disk->d_mine = 0;
167 disk->d_ufs = 0;
168 disk->d_error = NULL;
169 disk->d_si = NULL;
170 disk->d_sblockloc = UFS_STDSB;
171 disk->d_lookupflags = 0;
172
173 if (oname != name) {
174 name = strdup(name);
175 if (name == NULL) {
176 ERROR(disk, "could not allocate memory for disk name");
177 return (-1);
178 }
179 disk->d_mine |= MINE_NAME;
180 }
181 disk->d_name = name;
182
183 return (0);
184 }
185
186 int
ufs_disk_write(struct uufsd * disk)187 ufs_disk_write(struct uufsd *disk)
188 {
189 int fd;
190
191 ERROR(disk, NULL);
192
193 if (disk->d_mine & MINE_WRITE)
194 return (0);
195
196 fd = open(disk->d_name, O_RDWR);
197 if (fd < 0) {
198 ERROR(disk, "failed to open disk for writing");
199 return (-1);
200 }
201
202 close(disk->d_fd);
203 disk->d_fd = fd;
204 disk->d_mine |= MINE_WRITE;
205
206 return (0);
207 }
208