1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2005 Mark Santcroos <marks@freebsd.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions 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 WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28 #include <sys/param.h>
29 #include <sys/mount.h>
30
31 #include <ufs/ufs/dinode.h>
32 #include <ufs/ffs/fs.h>
33
34 #include <errno.h>
35 #include <ftw.h>
36 #include <libufs.h>
37 #include <stdint.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 #include <unistd.h>
42
43 static void find_inum(char *path);
44 static void usage(void);
45 static int compare_function(const char *, const struct stat *,
46 int, struct FTW *);
47 static int find_snapshot(struct statfs *sfs);
48
49 static int verbose;
50 static int cont_search;
51 static uint32_t inode;
52
53 int
main(int argc,char ** argv)54 main(int argc, char **argv)
55 {
56 char *path;
57 struct stat st;
58 struct statfs *mntbuf;
59 int all = 0, ch, done = 0, fscount, n;
60
61 while ((ch = getopt(argc, argv, "adv")) != -1) {
62 switch (ch) {
63 case 'a':
64 all++;
65 break;
66 case 'd':
67 /* continue to search when matching inode is found
68 * this feature is not documented */
69 cont_search++;
70 break;
71 case 'v':
72 verbose++;
73 break;
74 default:
75 usage();
76 }
77 }
78
79 argc -= optind;
80 argv += optind;
81
82 if ((all == 0 && argc != 1) || (all == 1 && argc > 0))
83 usage();
84
85 if (!all) {
86 char resolved[PATH_MAX];
87
88 path = *argv;
89 /*
90 * mount(8) use realpath(3) before mounting file system,
91 * so let's do the same with the given path.
92 */
93 if (realpath(path, resolved) == NULL || /* can create full path */
94 stat(resolved, &st) == -1 || /* is it stat'able */
95 !S_ISDIR(st.st_mode)) { /* is it a directory */
96 usage();
97 }
98 path = resolved;
99 }
100
101 fscount = getmntinfo(&mntbuf, MNT_WAIT);
102 for (n = 0; n < fscount; n++) {
103 if (!strncmp(mntbuf[n].f_fstypename, "ufs", 3)) {
104 if (all || strcmp(path, mntbuf[n].f_mntonname) == 0) {
105 find_snapshot(&mntbuf[n]);
106 done++;
107 }
108 }
109 }
110
111 if (done == 0)
112 usage();
113
114 return (0);
115 }
116
117 static int
find_snapshot(struct statfs * sfs)118 find_snapshot(struct statfs *sfs)
119 {
120 struct uufsd disk;
121 int j, snapcount = 0;
122
123 if (ufs_disk_fillout(&disk, sfs->f_mntfromname) == -1)
124 perror("ufs_disk_fillout");
125
126 if (verbose)
127 printf("%s mounted on %s\n", disk.d_name, disk.d_fs.fs_fsmnt);
128
129 for (j = 0; j < FSMAXSNAP; j++) {
130 if (disk.d_fs.fs_snapinum[j]) {
131 inode = disk.d_fs.fs_snapinum[j];
132 find_inum(sfs->f_mntonname);
133 snapcount++;
134 }
135 }
136
137 if (!snapcount && verbose)
138 printf("\tno snapshots found\n");
139
140 return 0;
141 }
142
143 static int
compare_function(const char * path,const struct stat * st,int flags,struct FTW * ftwv __unused)144 compare_function(const char *path, const struct stat *st, int flags,
145 struct FTW * ftwv __unused)
146 {
147
148 if (flags == FTW_F && st->st_ino == inode) {
149 if (verbose)
150 printf("\tsnapshot ");
151 printf("%s", path);
152 if (verbose)
153 printf(" (inode %ju)", (uintmax_t)st->st_ino);
154 printf("\n");
155 if (!cont_search)
156 return (EEXIST);
157 }
158
159 return (0);
160 }
161
162 static void
find_inum(char * path)163 find_inum(char *path)
164 {
165 int ret;
166
167 ret = nftw(path, compare_function, 1, FTW_PHYS|FTW_MOUNT);
168 if (ret != EEXIST && ret != 0) {
169 perror("ftw");
170 exit(ret);
171 }
172 }
173
174 static void
usage(void)175 usage(void)
176 {
177
178 printf("usage: snapinfo [-v] -a\n");
179 printf(" snapinfo [-v] mountpoint\n");
180 exit(1);
181 }
182