release/src/router/busybox/e2fsprogs/blkid/cache.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * cache.c - allocation/initialization/free routines for cache
   4  *
   5  * Copyright (C) 2001 Andreas Dilger
   6  * Copyright (C) 2003 Theodore Ts'o
   7  *
   8  * %Begin-Header%
   9  * This file may be redistributed under the terms of the
  10  * GNU Lesser General Public License.
  11  * %End-Header%
  12  */
  13
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <unistd.h>
  17 #include "blkidP.h"
  18
  19 int blkid_debug_mask = 0;
  20
  21 int blkid_get_cache(blkid_cache *ret_cache, const char *filename)
  22 {
  23         blkid_cache cache;
  24
  25 #ifdef CONFIG_BLKID_DEBUG
  26         if (!(blkid_debug_mask & DEBUG_INIT)) {
  27                 char *dstr = getenv("BLKID_DEBUG");
  28
  29                 if (dstr)
  30                         blkid_debug_mask = strtoul(dstr, 0, 0);
  31                 blkid_debug_mask |= DEBUG_INIT;
  32         }
  33 #endif
  34
  35         DBG(DEBUG_CACHE, printf("creating blkid cache (using %s)\n",
  36                                 filename ? filename : "default cache"));
  37
  38         cache = xzalloc(sizeof(struct blkid_struct_cache));
  39
  40         INIT_LIST_HEAD(&cache->bic_devs);
  41         INIT_LIST_HEAD(&cache->bic_tags);
  42
  43         if (filename && !strlen(filename))
  44                 filename = 0;
  45         if (!filename && (getuid() == geteuid()))
  46                 filename = getenv("BLKID_FILE");
  47         if (!filename)
  48                 filename = BLKID_CACHE_FILE;
  49         cache->bic_filename = blkid_strdup(filename);
  50
  51         blkid_read_cache(cache);
  52
  53         *ret_cache = cache;
  54         return 0;
  55 }
  56
  57 void blkid_put_cache(blkid_cache cache)
  58 {
  59         if (!cache)
  60                 return;
  61
  62         (void) blkid_flush_cache(cache);
  63
  64         DBG(DEBUG_CACHE, printf("freeing cache struct\n"));
  65
  66         /* DBG(DEBUG_CACHE, blkid_debug_dump_cache(cache)); */
  67
  68         while (!list_empty(&cache->bic_devs)) {
  69                 blkid_dev dev = list_entry(cache->bic_devs.next,
  70                                            struct blkid_struct_dev,
  71                                             bid_devs);
  72                 blkid_free_dev(dev);
  73         }
  74
  75         while (!list_empty(&cache->bic_tags)) {
  76                 blkid_tag tag = list_entry(cache->bic_tags.next,
  77                                            struct blkid_struct_tag,
  78                                            bit_tags);
  79
  80                 while (!list_empty(&tag->bit_names)) {
  81                         blkid_tag bad = list_entry(tag->bit_names.next,
  82                                                    struct blkid_struct_tag,
  83                                                    bit_names);
  84
  85                         DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n",
  86                                                 bad->bit_name, bad->bit_val));
  87                         blkid_free_tag(bad);
  88                 }
  89                 blkid_free_tag(tag);
  90         }
  91         free(cache->bic_filename);
  92
  93         free(cache);
  94 }
  95
  96 #ifdef TEST_PROGRAM
  97 int main(int argc, char** argv)
  98 {
  99         blkid_cache cache = NULL;
 100         int ret;
 101
 102         blkid_debug_mask = DEBUG_ALL;
 103         if ((argc > 2)) {
 104                 fprintf(stderr, "Usage: %s [filename]\n", argv[0]);
 105                 exit(1);
 106         }
 107
 108         if ((ret = blkid_get_cache(&cache, argv[1])) < 0) {
 109                 fprintf(stderr, "error %d parsing cache file %s\n", ret,
 110                         argv[1] ? argv[1] : BLKID_CACHE_FILE);
 111                 exit(1);
 112         }
 113         if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
 114                 fprintf(stderr, "%s: error creating cache (%d)\n",
 115                         argv[0], ret);
 116                 exit(1);
 117         }
 118         if ((ret = blkid_probe_all(cache) < 0))
 119                 fprintf(stderr, "error probing devices\n");
 120
 121         blkid_put_cache(cache);
 122
 123         return ret;
 124 }
 125 #endif