1 /* 2 * Copyright (c) 2015 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Antonio Huete <tuxillo@quantumachine.net> 6 * by Matthew Dillon <dillon@backplane.com> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in 16 * the documentation and/or other materials provided with the 17 * distribution. 18 * 3. Neither the name of The DragonFly Project nor the names of its 19 * contributors may be used to endorse or promote products derived 20 * from this software without specific, prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 /* 36 * Backwards compatibility functions with prior HAMMER versions 37 */ 38 39 #include <stdio.h> 40 #include <string.h> 41 #include <dirent.h> 42 #include <stdlib.h> 43 44 #include <sys/types.h> 45 #include <sys/stat.h> 46 47 #include "libhammer.h" 48 49 void 50 libhammer_compat_old_snapcount(libhammer_pfsinfo_t pip) 51 { 52 53 struct dirent *den; 54 struct stat st; 55 char *snapshots_path, *fpath; 56 int spallocated = 0; 57 DIR *dir; 58 59 /* 60 * XXX old style: count the number of softlinks in the snapshots dir 61 * 62 * The problem with this approach, which is the original one from 63 * hammer(8), is that only the snapshots in the 'snapshots' directory 64 * (or any other specified for a PFS) are taken in account and this 65 * assumes that 'hammer cleanup' has run at least once. 66 * A more correct solution would be using glob(3) to find the 67 * snap-* files in the 'snapshots' directory among other places. 68 */ 69 if (pip->snapshots[0]) { 70 snapshots_path = pip->snapshots; 71 } else { 72 asprintf(&snapshots_path, "%s/snapshots", pip->mountedon); 73 spallocated = 1; 74 } 75 if ((dir = opendir(snapshots_path)) != NULL) { 76 while ((den = readdir(dir)) != NULL) { 77 if (den->d_name[0] == '.') 78 continue; 79 asprintf(&fpath, "%s/%s", snapshots_path, 80 den->d_name); 81 if (lstat(fpath, &st) == 0 && 82 S_ISLNK(st.st_mode)) 83 pip->snapcount++; 84 free(fpath); 85 } 86 closedir(dir); 87 } 88 if (spallocated) 89 free(snapshots_path); 90 91 } 92