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