lib/libhammer/compat.c

   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 }