Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mail-cache-fields.c @ 2866:bf1e718e7370 HEAD
Cache file works now with mmap_disable=yes. Still needs a few optimizations.
author | Timo Sirainen <tss@iki.fi> |
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date | Mon, 08 Nov 2004 02:40:36 +0200 |
parents | f1e9f3ec8135 |
children | d416b6d0a7ee |
rev | line source |
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1 /* Copyright (C) 2004 Timo Sirainen */ |
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2 |
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3 #include "lib.h" |
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4 #include "buffer.h" |
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5 #include "hash.h" |
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6 #include "file-cache.h" |
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7 #include "write-full.h" |
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8 #include "mail-cache-private.h" |
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9 |
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10 #include <stddef.h> |
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11 |
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12 #define CACHE_HDR_PREFETCH 1024 |
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13 |
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14 void mail_cache_register_fields(struct mail_cache *cache, |
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15 struct mail_cache_field *fields, |
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16 size_t fields_count) |
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17 { |
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18 void *orig_key, *orig_value; |
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19 unsigned int new_idx; |
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20 size_t i; |
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21 |
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22 new_idx = cache->fields_count; |
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23 for (i = 0; i < fields_count; i++) { |
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24 if (hash_lookup_full(cache->field_name_hash, fields[i].name, |
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25 &orig_key, &orig_value)) { |
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26 fields[i].idx = |
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27 POINTER_CAST_TO(orig_value, unsigned int); |
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28 continue; |
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29 } |
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30 |
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31 fields[i].idx = new_idx++; |
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32 } |
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33 |
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34 if (new_idx == cache->fields_count) |
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35 return; |
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36 |
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37 /* @UNSAFE */ |
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38 cache->fields = i_realloc(cache->fields, |
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39 cache->fields_count * sizeof(*cache->fields), |
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40 new_idx * sizeof(*cache->fields)); |
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41 cache->field_file_map = |
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42 i_realloc(cache->field_file_map, |
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43 cache->fields_count * sizeof(*cache->field_file_map), |
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44 new_idx * sizeof(*cache->field_file_map)); |
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45 |
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46 for (i = 0; i < fields_count; i++) { |
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47 unsigned int idx = fields[i].idx; |
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48 |
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49 if (idx < cache->fields_count) |
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50 continue; |
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51 |
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52 /* new index - save it */ |
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53 cache->fields[idx].field = fields[i]; |
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54 cache->fields[idx].field.name = |
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55 p_strdup(cache->field_pool, fields[i].name); |
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56 cache->field_file_map[idx] = (uint32_t)-1; |
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57 |
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58 switch (cache->fields[idx].field.type) { |
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59 case MAIL_CACHE_FIELD_FIXED_SIZE: |
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60 case MAIL_CACHE_FIELD_BITMASK: |
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61 break; |
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62 case MAIL_CACHE_FIELD_VARIABLE_SIZE: |
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63 case MAIL_CACHE_FIELD_STRING: |
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64 case MAIL_CACHE_FIELD_HEADER: |
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65 cache->fields[idx].field.field_size = (unsigned int)-1; |
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66 break; |
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67 } |
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68 |
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69 hash_insert(cache->field_name_hash, |
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70 (char *)cache->fields[idx].field.name, |
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71 POINTER_CAST(idx)); |
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72 } |
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73 cache->fields_count = new_idx; |
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74 } |
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75 |
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76 unsigned int |
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77 mail_cache_register_lookup(struct mail_cache *cache, const char *name) |
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78 { |
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79 void *orig_key, *orig_value; |
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80 |
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81 if (hash_lookup_full(cache->field_name_hash, name, |
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82 &orig_key, &orig_value)) |
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83 return POINTER_CAST_TO(orig_value, unsigned int); |
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84 else |
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85 return (unsigned int)-1; |
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86 } |
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87 |
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88 static int mail_cache_header_fields_get_offset(struct mail_cache *cache, |
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89 uint32_t *offset_r) |
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90 { |
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91 const struct mail_cache_header_fields *field_hdr; |
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92 uint32_t offset, next_offset; |
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93 |
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94 if (MAIL_CACHE_IS_UNUSABLE(cache)) { |
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95 *offset_r = 0; |
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96 return 0; |
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97 } |
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98 |
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99 /* find the latest header */ |
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100 offset = 0; |
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101 next_offset = |
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102 mail_index_offset_to_uint32(cache->hdr->field_header_offset); |
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103 while (next_offset != 0) { |
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104 if (next_offset == offset) { |
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105 mail_cache_set_corrupted(cache, |
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106 "next_offset in field header loops"); |
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107 return -1; |
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108 } |
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109 offset = next_offset; |
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110 |
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111 if (mail_cache_map(cache, offset, |
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112 sizeof(*field_hdr) + CACHE_HDR_PREFETCH) < 0) |
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113 return -1; |
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114 |
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115 field_hdr = CONST_PTR_OFFSET(cache->data, offset); |
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116 next_offset = |
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117 mail_index_offset_to_uint32(field_hdr->next_offset); |
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118 } |
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119 |
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120 *offset_r = offset; |
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121 return 0; |
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Header caching redesigned. New design allows caching decisions per field, so
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|
122 } |
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Header caching redesigned. New design allows caching decisions per field, so
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123 |
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Header caching redesigned. New design allows caching decisions per field, so
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124 int mail_cache_header_fields_read(struct mail_cache *cache) |
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125 { |
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126 const struct mail_cache_header_fields *field_hdr = NULL; |
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127 struct mail_cache_field field; |
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128 const uint32_t *last_used, *sizes; |
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129 const uint8_t *types, *decisions; |
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130 const char *p, *names, *end; |
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131 void *orig_key, *orig_value; |
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132 uint32_t offset, i; |
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133 |
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Header caching redesigned. New design allows caching decisions per field, so
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134 if (mail_cache_header_fields_get_offset(cache, &offset) < 0) |
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135 return -1; |
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136 |
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Header caching redesigned. New design allows caching decisions per field, so
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137 if (offset == 0) { |
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138 /* no fields - the file is empty */ |
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139 return 0; |
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140 } |
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Header caching redesigned. New design allows caching decisions per field, so
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141 |
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Cache file works now with mmap_disable=yes. Still needs a few optimizations.
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142 field_hdr = CONST_PTR_OFFSET(cache->data, offset); |
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143 if (offset + field_hdr->size > cache->mmap_length) { |
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144 mail_cache_set_corrupted(cache, |
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145 "field header points outside file"); |
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146 return -1; |
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147 } |
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Header caching redesigned. New design allows caching decisions per field, so
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148 |
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149 /* check the fixed size of the header. name[] has to be checked |
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150 separately */ |
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151 if (field_hdr->size < sizeof(*field_hdr) + |
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152 field_hdr->fields_count * (sizeof(uint32_t)*2 + 1 + 2)) { |
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153 mail_cache_set_corrupted(cache, "invalid field header size"); |
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154 return -1; |
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155 } |
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Header caching redesigned. New design allows caching decisions per field, so
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156 |
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Header caching redesigned. New design allows caching decisions per field, so
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157 if (field_hdr->size > sizeof(*field_hdr) + CACHE_HDR_PREFETCH) { |
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158 if (mail_cache_map(cache, offset, field_hdr->size) < 0) |
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159 return -1; |
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|
160 } |
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Cache file works now with mmap_disable=yes. Still needs a few optimizations.
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|
161 field_hdr = CONST_PTR_OFFSET(cache->data, offset); |
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162 |
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163 cache->file_field_map = |
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164 i_realloc(cache->file_field_map, |
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165 cache->file_fields_count * sizeof(unsigned int), |
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166 field_hdr->fields_count * sizeof(unsigned int)); |
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167 cache->file_fields_count = field_hdr->fields_count; |
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168 |
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169 last_used = CONST_PTR_OFFSET(field_hdr, MAIL_CACHE_FIELD_LAST_USED()); |
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170 sizes = CONST_PTR_OFFSET(field_hdr, |
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171 MAIL_CACHE_FIELD_SIZE(field_hdr->fields_count)); |
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172 types = CONST_PTR_OFFSET(field_hdr, |
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173 MAIL_CACHE_FIELD_TYPE(field_hdr->fields_count)); |
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174 decisions = CONST_PTR_OFFSET(field_hdr, |
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175 MAIL_CACHE_FIELD_DECISION(field_hdr->fields_count)); |
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176 names = CONST_PTR_OFFSET(field_hdr, |
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177 MAIL_CACHE_FIELD_NAMES(field_hdr->fields_count)); |
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178 end = CONST_PTR_OFFSET(field_hdr, field_hdr->size); |
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179 |
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180 /* clear the old mapping */ |
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181 for (i = 0; i < cache->fields_count; i++) |
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182 cache->field_file_map[i] = (uint32_t)-1; |
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183 |
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Header caching redesigned. New design allows caching decisions per field, so
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|
184 memset(&field, 0, sizeof(field)); |
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185 for (i = 0; i < field_hdr->fields_count; i++) { |
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Header caching redesigned. New design allows caching decisions per field, so
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186 for (p = names; p != end && *p != '\0'; p++) ; |
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187 if (p == end || *names == '\0') { |
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188 mail_cache_set_corrupted(cache, |
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Header caching redesigned. New design allows caching decisions per field, so
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|
189 "field header names corrupted"); |
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Header caching redesigned. New design allows caching decisions per field, so
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|
190 return -1; |
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Header caching redesigned. New design allows caching decisions per field, so
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|
191 } |
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Header caching redesigned. New design allows caching decisions per field, so
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|
192 |
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Cache fixes. Decisions are saved again.
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193 if (hash_lookup_full(cache->field_name_hash, names, |
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Cache fixes. Decisions are saved again.
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194 &orig_key, &orig_value)) { |
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195 /* already exists, see if decision can be updated */ |
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196 field.idx = POINTER_CAST_TO(orig_value, unsigned int); |
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197 if (!cache->fields[field.idx].decision_dirty) { |
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198 cache->fields[field.idx].field.decision = |
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Cache fixes. Decisions are saved again.
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199 decisions[i]; |
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Cache fixes. Decisions are saved again.
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|
200 } |
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Cache fixes. Decisions are saved again.
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201 if (cache->fields[field.idx].field.type != types[i]) { |
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Cache fixes. Decisions are saved again.
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202 mail_cache_set_corrupted(cache, |
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Cache fixes. Decisions are saved again.
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|
203 "registered field type changed"); |
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Cache fixes. Decisions are saved again.
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204 return -1; |
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Cache fixes. Decisions are saved again.
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|
205 } |
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Cache fixes. Decisions are saved again.
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206 } else { |
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|
207 field.name = names; |
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|
208 field.type = types[i]; |
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Cache fixes. Decisions are saved again.
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|
209 field.field_size = sizes[i]; |
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|
210 field.decision = decisions[i]; |
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Cache fixes. Decisions are saved again.
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|
211 mail_cache_register_fields(cache, &field, 1); |
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Cache fixes. Decisions are saved again.
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212 } |
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|
213 cache->field_file_map[field.idx] = i; |
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|
214 cache->file_field_map[i] = field.idx; |
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Header caching redesigned. New design allows caching decisions per field, so
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diff
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|
215 |
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216 /* update last_used if it's newer than ours */ |
2342 | 217 if (last_used[i] > cache->fields[field.idx].last_used) |
218 cache->fields[field.idx].last_used = last_used[i]; | |
2339
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|
219 |
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Cache fixes. Decisions are saved again.
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220 names = p + 1; |
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Header caching redesigned. New design allows caching decisions per field, so
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|
221 } |
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Header caching redesigned. New design allows caching decisions per field, so
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diff
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|
222 return 0; |
7d02e2a7672d
Header caching redesigned. New design allows caching decisions per field, so
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diff
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|
223 } |
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Header caching redesigned. New design allows caching decisions per field, so
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diff
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|
224 |
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225 static void copy_to_buf(struct mail_cache *cache, buffer_t *dest, |
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226 size_t offset, size_t size) |
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Cache fixes. Decisions are saved again.
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227 { |
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228 const void *data; |
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229 unsigned int i, field; |
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Cache fixes. Decisions are saved again.
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|
230 |
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Cache fixes. Decisions are saved again.
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231 for (i = 0; i < cache->file_fields_count; i++) { |
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Cache fixes. Decisions are saved again.
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232 field = cache->file_field_map[i]; |
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|
233 data = CONST_PTR_OFFSET(&cache->fields[field], offset); |
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234 buffer_append(dest, data, size); |
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Cache fixes. Decisions are saved again.
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|
235 } |
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236 for (i = 0; i < cache->fields_count; i++) { |
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237 if (cache->field_file_map[i] != (uint32_t)-1) |
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238 continue; |
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239 data = CONST_PTR_OFFSET(&cache->fields[i], offset); |
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240 buffer_append(dest, data, size); |
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Cache fixes. Decisions are saved again.
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241 } |
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Cache fixes. Decisions are saved again.
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242 } |
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243 |
2342 | 244 static void copy_to_buf_byte(struct mail_cache *cache, buffer_t *dest, |
245 size_t offset) | |
246 { | |
247 const int *data; | |
248 unsigned int i, field; | |
249 uint8_t byte; | |
250 | |
251 for (i = 0; i < cache->file_fields_count; i++) { | |
252 field = cache->file_field_map[i]; | |
253 data = CONST_PTR_OFFSET(&cache->fields[field], offset); | |
254 byte = (uint8_t)*data; | |
255 buffer_append(dest, &byte, 1); | |
256 } | |
257 for (i = 0; i < cache->fields_count; i++) { | |
258 if (cache->field_file_map[i] != (uint32_t)-1) | |
259 continue; | |
260 data = CONST_PTR_OFFSET(&cache->fields[i], offset); | |
261 byte = (uint8_t)*data; | |
262 buffer_append(dest, &byte, 1); | |
263 } | |
264 } | |
265 | |
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266 int mail_cache_header_fields_update(struct mail_cache *cache) |
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267 { |
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268 int locked = cache->locked; |
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269 buffer_t *buffer; |
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270 uint32_t i, offset; |
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271 size_t size; |
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272 int ret = 0; |
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273 |
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274 if (!locked) { |
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275 if (mail_cache_lock(cache) <= 0) |
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276 return -1; |
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277 } |
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278 |
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279 if (mail_cache_header_fields_read(cache) < 0 || |
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280 mail_cache_header_fields_get_offset(cache, &offset) < 0) { |
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281 mail_cache_unlock(cache); |
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282 return -1; |
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283 } |
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284 |
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285 t_push(); |
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286 buffer = buffer_create_dynamic(pool_datastack_create(), 256); |
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287 |
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288 copy_to_buf(cache, buffer, |
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289 offsetof(struct mail_cache_field_private, last_used), |
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290 sizeof(uint32_t)); |
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291 size = buffer->used; |
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292 |
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293 ret = pwrite_full(cache->fd, buffer->data, |
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294 sizeof(uint32_t) * cache->file_fields_count, |
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295 offset + MAIL_CACHE_FIELD_LAST_USED()); |
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296 if (ret == 0) { |
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297 buffer_set_used_size(buffer, 0); |
2342 | 298 copy_to_buf_byte(cache, buffer, |
299 offsetof(struct mail_cache_field, decision)); | |
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300 size += buffer->used; |
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301 |
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302 ret = pwrite_full(cache->fd, buffer->data, |
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303 sizeof(uint8_t) * cache->file_fields_count, offset + |
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304 MAIL_CACHE_FIELD_DECISION(cache->file_fields_count)); |
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305 |
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306 if (ret == 0) { |
2592 | 307 for (i = 0; i < cache->file_fields_count; i++) |
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308 cache->fields[i].decision_dirty = FALSE; |
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309 } |
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310 } |
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311 t_pop(); |
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312 |
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313 if (ret == 0) { |
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314 cache->field_header_write_pending = FALSE; |
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315 if (cache->file_cache != NULL) |
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316 file_cache_invalidate(cache->file_cache, offset, size); |
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317 } |
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318 |
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319 if (!locked) |
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320 mail_cache_unlock(cache); |
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321 return ret; |
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322 } |
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323 |
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324 void mail_cache_header_fields_get(struct mail_cache *cache, buffer_t *dest) |
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325 { |
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326 struct mail_cache_header_fields hdr; |
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327 unsigned int field; |
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328 const char *name; |
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329 uint32_t i; |
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330 |
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331 memset(&hdr, 0, sizeof(hdr)); |
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332 hdr.fields_count = cache->fields_count; |
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333 buffer_append(dest, &hdr, sizeof(hdr)); |
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334 |
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335 /* we have to keep the field order for the existing fields. */ |
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336 copy_to_buf(cache, dest, |
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337 offsetof(struct mail_cache_field_private, last_used), |
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338 sizeof(uint32_t)); |
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339 copy_to_buf(cache, dest, offsetof(struct mail_cache_field, field_size), |
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340 sizeof(uint32_t)); |
2342 | 341 copy_to_buf_byte(cache, dest, offsetof(struct mail_cache_field, type)); |
342 copy_to_buf_byte(cache, dest, | |
343 offsetof(struct mail_cache_field, decision)); | |
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344 |
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345 i_assert(buffer_get_used_size(dest) == sizeof(hdr) + |
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346 (sizeof(uint32_t)*2 + 2) * hdr.fields_count); |
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347 |
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348 for (i = 0; i < cache->file_fields_count; i++) { |
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349 field = cache->file_field_map[i]; |
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350 name = cache->fields[field].field.name; |
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351 buffer_append(dest, name, strlen(name)+1); |
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352 } |
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353 for (i = 0; i < cache->fields_count; i++) { |
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354 if (cache->field_file_map[i] != (uint32_t)-1) |
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355 continue; |
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356 name = cache->fields[i].field.name; |
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357 buffer_append(dest, name, strlen(name)+1); |
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358 } |
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359 |
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360 hdr.size = buffer_get_used_size(dest); |
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361 buffer_write(dest, 0, &hdr, sizeof(hdr)); |
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362 |
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363 if ((hdr.size & 3) != 0) |
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364 buffer_append(dest, null4, 4 - (hdr.size & 3)); |
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365 } |
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366 |
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367 int mail_cache_header_fields_get_next_offset(struct mail_cache *cache, |
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368 uint32_t *offset_r) |
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369 { |
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370 if (mail_cache_header_fields_get_offset(cache, offset_r) < 0) |
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371 return -1; |
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372 |
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373 if (*offset_r == 0) { |
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374 *offset_r = offsetof(struct mail_cache_header, |
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375 field_header_offset); |
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376 } else { |
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377 *offset_r += offsetof(struct mail_cache_header_fields, |
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378 next_offset); |
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379 } |
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380 return 0; |
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381 } |