e2fsprogs/old_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         if (!(cache = (blkid_cache) calloc(1, sizeof(struct blkid_struct_cache))))
  39                 return -BLKID_ERR_MEM;
  40
  41         INIT_LIST_HEAD(&cache->bic_devs);
  42         INIT_LIST_HEAD(&cache->bic_tags);
  43
  44         if (filename && !strlen(filename))
  45                 filename = 0;
  46         if (!filename && (getuid() == geteuid()))
  47                 filename = getenv("BLKID_FILE");
  48         if (!filename)
  49                 filename = BLKID_CACHE_FILE;
  50         cache->bic_filename = blkid_strdup(filename);
  51
  52         blkid_read_cache(cache);
  53
  54         *ret_cache = cache;
  55         return 0;
  56 }
  57
  58 void blkid_put_cache(blkid_cache cache)
  59 {
  60         if (!cache)
  61                 return;
  62
  63         (void) blkid_flush_cache(cache);
  64
  65         DBG(DEBUG_CACHE, printf("freeing cache struct\n"));
  66
  67         /* DBG(DEBUG_CACHE, blkid_debug_dump_cache(cache)); */
  68
  69         while (!list_empty(&cache->bic_devs)) {
  70                 blkid_dev dev = list_entry(cache->bic_devs.next,
  71                                            struct blkid_struct_dev,
  72                                             bid_devs);
  73                 blkid_free_dev(dev);
  74         }
  75
  76         while (!list_empty(&cache->bic_tags)) {
  77                 blkid_tag tag = list_entry(cache->bic_tags.next,
  78                                            struct blkid_struct_tag,
  79                                            bit_tags);
  80
  81                 while (!list_empty(&tag->bit_names)) {
  82                         blkid_tag bad = list_entry(tag->bit_names.next,
  83                                                    struct blkid_struct_tag,
  84                                                    bit_names);
  85
  86                         DBG(DEBUG_CACHE, printf("warning: unfreed tag %s=%s\n",
  87                                                 bad->bit_name, bad->bit_val));
  88                         blkid_free_tag(bad);
  89                 }
  90                 blkid_free_tag(tag);
  91         }
  92         free(cache->bic_filename);
  93
  94         free(cache);
  95 }
  96
  97 #ifdef TEST_PROGRAM
  98 int main(int argc, char** argv)
  99 {
 100         blkid_cache cache = NULL;
 101         int ret;
 102
 103         blkid_debug_mask = DEBUG_ALL;
 104         if ((argc > 2)) {
 105                 fprintf(stderr, "Usage: %s [filename]\n", argv[0]);
 106                 exit(1);
 107         }
 108
 109         if ((ret = blkid_get_cache(&cache, argv[1])) < 0) {
 110                 fprintf(stderr, "error %d parsing cache file %s\n", ret,
 111                         argv[1] ? argv[1] : BLKID_CACHE_FILE);
 112                 exit(1);
 113         }
 114         if ((ret = blkid_get_cache(&cache, bb_dev_null)) != 0) {
 115                 fprintf(stderr, "%s: error creating cache (%d)\n",
 116                         argv[0], ret);
 117                 exit(1);
 118         }
 119         if ((ret = blkid_probe_all(cache) < 0))
 120                 fprintf(stderr, "error probing devices\n");
 121
 122         blkid_put_cache(cache);
 123
 124         return ret;
 125 }
 126 #endif