lib/blkid/cache.c

   1 /*
   2  * cache.c - allocation/initialization/free routines for cache
   3  *
   4  * Copyright (C) 2001 Andreas Dilger
   5  * Copyright (C) 2003 Theodore Ts'o
   6  *
   7  * %Begin-Header%
   8  * This file may be redistributed under the terms of the
   9  * GNU Lesser General Public License.
  10  * %End-Header%
  11  */
  12
  13 #include <stdlib.h>
  14 #include "blkidP.h"
  15
  16 int blkid_debug_mask = 0;
  17
  18 int blkid_get_cache(blkid_cache *ret_cache, const char *filename)
  19 {
  20         blkid_cache cache;
  21
  22 #ifdef CONFIG_BLKID_DEBUG
  23         if (!(blkid_debug_mask & DEBUG_INIT)) {
  24                 char *dstr = getenv("BLKID_DEBUG");
  25
  26                 if (dstr)
  27                         blkid_debug_mask = strtoul(dstr, 0, 0);
  28                 blkid_debug_mask |= DEBUG_INIT;
  29         }
  30 #endif
  31
  32         DBG(DEBUG_CACHE, printf("creating blkid cache (using %s)\n",
  33                                 filename ? filename : "default cache"));
  34
  35         if (!(cache = (blkid_cache) calloc(1, sizeof(struct blkid_struct_cache))))
  36                 return -BLKID_ERR_MEM;
  37
  38         INIT_LIST_HEAD(&cache->bic_devs);
  39         INIT_LIST_HEAD(&cache->bic_tags);
  40
  41         if (!filename || !strlen(filename))
  42                 filename = BLKID_CACHE_FILE;
  43         cache->bic_filename = blkid_strdup(filename);
  44
  45         blkid_read_cache(cache);
  46
  47         *ret_cache = cache;
  48         return 0;
  49 }
  50
  51 void blkid_put_cache(blkid_cache cache)
  52 {
  53         if (!cache)
  54                 return;
  55
  56         (void) blkid_flush_cache(cache);
  57
  58         DBG(DEBUG_CACHE, printf("freeing cache struct\n"));
  59
  60         /* DEB_DUMP_CACHE(cache); */
  61
  62         while (!list_empty(&cache->bic_devs)) {
  63                 blkid_dev dev = list_entry(cache->bic_devs.next,
  64                                            struct blkid_struct_dev,
  65                                             bid_devs);
  66                 blkid_free_dev(dev);
  67         }
  68
  69         while (!list_empty(&cache->bic_tags)) {
  70                 blkid_tag tag = list_entry(cache->bic_tags.next,
  71                                            struct blkid_struct_tag,
  72                                            bit_tags);
  73
  74                 while (!list_empty(&tag->bit_names)) {
  75                         blkid_tag bad = list_entry(tag->bit_names.next,
  76                                                    struct blkid_struct_tag,
  77                                                    bit_names);
  78
  79                         DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n",
  80                                                 bad->bit_name, bad->bit_val));
  81                         blkid_free_tag(bad);
  82                 }
  83                 blkid_free_tag(tag);
  84         }
  85         if (cache->bic_filename)
  86                 free(cache->bic_filename);
  87
  88         free(cache);
  89 }
  90
  91 #ifdef TEST_PROGRAM
  92 int main(int argc, char** argv)
  93 {
  94         blkid_cache cache = NULL;
  95         int ret;
  96
  97         blkid_debug_mask = DEBUG_ALL;
  98         if ((argc > 2)) {
  99                 fprintf(stderr, "Usage: %s [filename] \n", argv[0]);
 100                 exit(1);
 101         }
 102
 103         if ((ret = blkid_get_cache(&cache, argv[1])) < 0) {
 104                 fprintf(stderr, "error %d parsing cache file %s\n", ret,
 105                         argv[1] ? argv[1] : BLKID_CACHE_FILE);
 106                 exit(1);
 107         }
 108         if ((ret = blkid_get_cache(&cache, "/dev/null")) != 0) {
 109                 fprintf(stderr, "%s: error creating cache (%d)\n",
 110                         argv[0], ret);
 111                 exit(1);
 112         }
 113         if ((ret = blkid_probe_all(cache) < 0))
 114                 fprintf(stderr, "error probing devices\n");
 115
 116         blkid_put_cache(cache);
 117
 118         return ret;
 119 }
 120 #endif