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