1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 27 * 28 */ 29 30 #include <sys/param.h> 31 #include <sys/mount.h> 32 33 #include <ufs/ufs/dinode.h> 34 #include <ufs/ffs/fs.h> 35 36 #include <errno.h> 37 #include <ftw.h> 38 #include <libufs.h> 39 #include <stdint.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 static void find_inum(char *path); 46 static void usage(void); 47 static int compare_function(const char *, const struct stat *, 48 int, struct FTW *); 49 static int find_snapshot(struct statfs *sfs); 50 51 static int verbose; 52 static int cont_search; 53 static uint32_t inode; 54 55 int 56 main(int argc, char **argv) 57 { 58 char *path; 59 struct stat st; 60 struct statfs *mntbuf; 61 int all = 0, ch, done = 0, fscount, n; 62 63 while ((ch = getopt(argc, argv, "adv")) != -1) { 64 switch (ch) { 65 case 'a': 66 all++; 67 break; 68 case 'd': 69 /* continue to search when matching inode is found 70 * this feature is not documented */ 71 cont_search++; 72 break; 73 case 'v': 74 verbose++; 75 break; 76 default: 77 usage(); 78 } 79 } 80 81 argc -= optind; 82 argv += optind; 83 84 if ((all == 0 && argc != 1) || (all == 1 && argc > 0)) 85 usage(); 86 87 if (!all) { 88 char resolved[PATH_MAX]; 89 90 path = *argv; 91 /* 92 * mount(8) use realpath(3) before mounting file system, 93 * so let's do the same with the given path. 94 */ 95 if (realpath(path, resolved) == NULL || /* can create full path */ 96 stat(resolved, &st) == -1 || /* is it stat'able */ 97 !S_ISDIR(st.st_mode)) { /* is it a directory */ 98 usage(); 99 } 100 path = resolved; 101 } 102 103 fscount = getmntinfo(&mntbuf, MNT_WAIT); 104 for (n = 0; n < fscount; n++) { 105 if (!strncmp(mntbuf[n].f_fstypename, "ufs", 3)) { 106 if (all || strcmp(path, mntbuf[n].f_mntonname) == 0) { 107 find_snapshot(&mntbuf[n]); 108 done++; 109 } 110 } 111 } 112 113 if (done == 0) 114 usage(); 115 116 return (0); 117 } 118 119 static int 120 find_snapshot(struct statfs *sfs) 121 { 122 struct uufsd disk; 123 int j, snapcount = 0; 124 125 if (ufs_disk_fillout(&disk, sfs->f_mntfromname) == -1) 126 perror("ufs_disk_fillout"); 127 128 if (verbose) 129 printf("%s mounted on %s\n", disk.d_name, disk.d_fs.fs_fsmnt); 130 131 for (j = 0; j < FSMAXSNAP; j++) { 132 if (disk.d_fs.fs_snapinum[j]) { 133 inode = disk.d_fs.fs_snapinum[j]; 134 find_inum(sfs->f_mntonname); 135 snapcount++; 136 } 137 } 138 139 if (!snapcount && verbose) 140 printf("\tno snapshots found\n"); 141 142 return 0; 143 } 144 145 static int 146 compare_function(const char *path, const struct stat *st, int flags, 147 struct FTW * ftwv __unused) 148 { 149 150 if (flags == FTW_F && st->st_ino == inode) { 151 if (verbose) 152 printf("\tsnapshot "); 153 printf("%s", path); 154 if (verbose) 155 printf(" (inode %ju)", (uintmax_t)st->st_ino); 156 printf("\n"); 157 if (!cont_search) 158 return (EEXIST); 159 } 160 161 return (0); 162 } 163 164 static void 165 find_inum(char *path) 166 { 167 int ret; 168 169 ret = nftw(path, compare_function, 1, FTW_PHYS|FTW_MOUNT); 170 if (ret != EEXIST && ret != 0) { 171 perror("ftw"); 172 exit(ret); 173 } 174 } 175 176 static void 177 usage(void) 178 { 179 180 printf("usage: snapinfo [-v] -a\n"); 181 printf(" snapinfo [-v] mountpoint\n"); 182 exit(1); 183 } 184