Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mail-cache-compress.c @ 5736:b3ed52bbeca7 HEAD
Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
author | Timo Sirainen <tss@iki.fi> |
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date | Thu, 14 Jun 2007 04:40:34 +0300 |
parents | 4b5ce642957d |
children | 615a8c31ff47 |
rev | line source |
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1 /* Copyright (C) 2003-2004 Timo Sirainen */ |
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2 |
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3 #include "lib.h" |
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4 #include "array.h" |
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5 #include "ostream.h" |
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6 #include "nfs-workarounds.h" |
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7 #include "read-full.h" |
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8 #include "close-keep-errno.h" |
3106 | 9 #include "file-dotlock.h" |
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10 #include "file-cache.h" |
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11 #include "file-set-size.h" |
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12 #include "mail-cache-private.h" |
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13 |
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14 #include <sys/stat.h> |
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15 |
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16 struct mail_cache_copy_context { |
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17 struct mail_cache *cache; |
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18 |
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19 buffer_t *buffer, *field_seen; |
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20 uint8_t field_seen_value; |
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21 bool new_msg; |
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22 }; |
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23 |
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24 static void mail_cache_merge_bitmask(struct mail_cache *cache, buffer_t *buffer, |
2619 | 25 uint32_t field, const void *data, |
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26 size_t data_size) |
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27 { |
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28 void *buf_data; |
2620 | 29 uint32_t buf_field; |
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30 unsigned int i, buf_data_size; |
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31 size_t pos, buf_size; |
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32 |
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33 buf_data = buffer_get_modifiable_data(buffer, &buf_size); |
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34 for (pos = sizeof(struct mail_cache_record); pos < buf_size; ) { |
2620 | 35 buf_field = *((uint32_t *)PTR_OFFSET(buf_data, pos)); |
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36 pos += sizeof(uint32_t); |
2700 | 37 i_assert(buf_field < cache->fields_count); |
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38 |
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39 buf_data_size = cache->fields[buf_field].field.field_size; |
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40 if (buf_data_size == (unsigned int)-1) { |
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41 buf_data_size = |
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42 *((uint32_t *)PTR_OFFSET(buf_data, pos)); |
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43 pos += sizeof(uint32_t); |
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44 } |
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45 |
2620 | 46 if (buf_field == field) { |
2700 | 47 /* @UNSAFE: found it, do the merging */ |
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48 unsigned char *dest = PTR_OFFSET(buf_data, pos); |
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49 |
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50 i_assert(buf_data_size == data_size); |
2700 | 51 i_assert(pos + buf_data_size <= buf_size); |
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52 for (i = 0; i < buf_data_size; i++) |
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53 dest[i] |= ((const unsigned char*)data)[i]; |
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54 break; |
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55 } |
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56 pos += (buf_data_size + 3) & ~3; |
2700 | 57 i_assert(pos <= buf_size); |
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58 } |
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59 } |
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60 |
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61 static void |
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62 mail_cache_compress_field(struct mail_cache_copy_context *ctx, |
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63 const struct mail_cache_iterate_field *field) |
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64 { |
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65 uint32_t field_idx = field->field_idx; |
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66 struct mail_cache_field *cache_field; |
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67 enum mail_cache_decision_type dec; |
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68 uint8_t *field_seen; |
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69 uint32_t size32; |
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70 |
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71 cache_field = &ctx->cache->fields[field_idx].field; |
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72 |
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73 field_seen = buffer_get_space_unsafe(ctx->field_seen, field_idx, 1); |
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74 if (*field_seen == ctx->field_seen_value) { |
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75 /* duplicate */ |
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76 if (cache_field->type == MAIL_CACHE_FIELD_BITMASK) { |
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77 mail_cache_merge_bitmask(ctx->cache, ctx->buffer, |
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78 field_idx, field->data, |
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79 field->size); |
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80 } |
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81 return; |
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82 } |
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83 *field_seen = ctx->field_seen_value; |
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84 |
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85 dec = cache_field->decision & ~MAIL_CACHE_DECISION_FORCED; |
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86 if (ctx->new_msg) { |
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87 if (dec == MAIL_CACHE_DECISION_NO) |
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88 return; |
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89 } else { |
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90 if (dec != MAIL_CACHE_DECISION_YES) |
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91 return; |
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92 } |
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93 |
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94 buffer_append(ctx->buffer, &field_idx, sizeof(field_idx)); |
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95 |
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96 if (cache_field->field_size == (unsigned int)-1) { |
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97 size32 = (uint32_t)field->size; |
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98 buffer_append(ctx->buffer, &size32, sizeof(size32)); |
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99 } |
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100 |
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101 buffer_append(ctx->buffer, field->data, field->size); |
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102 if ((field->size & 3) != 0) |
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103 buffer_append_zero(ctx->buffer, 4 - (field->size & 3)); |
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104 } |
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105 |
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106 static uint32_t |
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107 get_next_file_seq(struct mail_cache *cache, struct mail_index_view *view) |
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108 { |
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109 const struct mail_index_ext *ext; |
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110 uint32_t file_seq; |
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111 |
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112 ext = mail_index_view_get_ext(view, cache->ext_id); |
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113 file_seq = ext != NULL ? ext->reset_id + 1 : (uint32_t)ioloop_time; |
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114 return file_seq != 0 ? file_seq : 1; |
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115 } |
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116 |
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117 static int |
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118 mail_cache_copy(struct mail_cache *cache, struct mail_index_transaction *trans, |
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119 int fd, uint32_t *file_seq_r, |
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120 ARRAY_TYPE(uint32_t) *ext_offsets) |
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121 { |
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122 struct mail_cache_copy_context ctx; |
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123 struct mail_cache_lookup_iterate_ctx iter; |
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124 struct mail_cache_iterate_field field; |
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125 struct mail_index_view *view; |
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126 struct mail_cache_view *cache_view; |
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127 const struct mail_index_header *idx_hdr; |
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128 struct mail_cache_header hdr; |
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129 struct mail_cache_record cache_rec; |
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130 struct ostream *output; |
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131 buffer_t *buffer; |
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132 uint32_t i, message_count, seq, first_new_seq, ext_offset; |
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133 |
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134 view = mail_index_transaction_get_view(trans); |
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135 |
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136 /* get sequence of first message which doesn't need its temp fields |
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137 removed. */ |
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138 idx_hdr = mail_index_get_header(view); |
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139 if (idx_hdr->day_first_uid[7] == 0) { |
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140 first_new_seq = 1; |
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141 message_count = mail_index_view_get_messages_count(view); |
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142 } else { |
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143 if (mail_index_lookup_uid_range(view, idx_hdr->day_first_uid[7], |
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144 (uint32_t)-1, &first_new_seq, |
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145 &message_count) < 0) |
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146 return -1; |
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147 if (first_new_seq == 0) |
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148 first_new_seq = message_count+1; |
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149 } |
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150 |
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151 cache_view = mail_cache_view_open(cache, view); |
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152 output = o_stream_create_file(fd, default_pool, 0, FALSE); |
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153 |
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154 memset(&hdr, 0, sizeof(hdr)); |
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155 hdr.version = MAIL_CACHE_VERSION; |
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156 hdr.compat_sizeof_uoff_t = sizeof(uoff_t); |
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157 hdr.indexid = idx_hdr->indexid; |
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158 hdr.file_seq = get_next_file_seq(cache, view); |
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159 o_stream_send(output, &hdr, sizeof(hdr)); |
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160 |
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161 memset(&ctx, 0, sizeof(ctx)); |
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162 ctx.cache = cache; |
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163 ctx.buffer = buffer_create_dynamic(default_pool, 4096); |
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164 ctx.field_seen = buffer_create_dynamic(default_pool, 64); |
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165 ctx.field_seen_value = 0; |
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166 |
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167 t_array_init(ext_offsets, message_count); |
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168 for (seq = 1; seq <= message_count; seq++) { |
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169 if (mail_index_transaction_is_expunged(trans, seq)) { |
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170 (void)array_append_space(ext_offsets); |
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171 continue; |
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172 } |
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173 |
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174 ctx.new_msg = seq >= first_new_seq; |
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175 buffer_set_used_size(ctx.buffer, 0); |
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176 |
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177 if (++ctx.field_seen_value == 0) { |
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178 memset(buffer_get_modifiable_data(ctx.field_seen, NULL), |
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179 0, buffer_get_size(ctx.field_seen)); |
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180 ctx.field_seen_value++; |
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181 } |
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182 |
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183 memset(&cache_rec, 0, sizeof(cache_rec)); |
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184 buffer_append(ctx.buffer, &cache_rec, sizeof(cache_rec)); |
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185 |
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186 mail_cache_lookup_iter_init(cache_view, seq, &iter); |
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187 while (mail_cache_lookup_iter_next(&iter, &field) > 0) |
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188 mail_cache_compress_field(&ctx, &field); |
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189 |
2299 | 190 cache_rec.size = buffer_get_used_size(ctx.buffer); |
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191 if (cache_rec.size == sizeof(cache_rec)) { |
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192 /* nothing cached */ |
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193 ext_offset = 0; |
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194 } else { |
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195 ext_offset = output->offset; |
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196 buffer_write(ctx.buffer, 0, &cache_rec, |
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197 sizeof(cache_rec)); |
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198 o_stream_send(output, ctx.buffer->data, cache_rec.size); |
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199 } |
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200 |
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201 array_append(ext_offsets, &ext_offset, 1); |
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202 } |
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203 i_assert(array_count(ext_offsets) == message_count); |
2619 | 204 |
205 if (cache->fields_count != 0) { | |
206 hdr.field_header_offset = | |
207 mail_index_uint32_to_offset(output->offset); | |
208 | |
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3b70ddb51771
Renamed "extra record info" and variations of it to "extension" or "ext" in
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209 /* we wrote everything using our internal field ids. so we want |
2619 | 210 mail_cache_header_fields_get() to use them and ignore any |
211 existing id mappings in the old cache file. */ | |
212 cache->file_fields_count = 0; | |
213 for (i = 0; i < cache->fields_count; i++) | |
214 cache->field_file_map[i] = (uint32_t)-1; | |
215 | |
216 t_push(); | |
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217 buffer = buffer_create_dynamic(pool_datastack_create(), 256); |
2619 | 218 mail_cache_header_fields_get(cache, buffer); |
219 o_stream_send(output, buffer_get_data(buffer, NULL), | |
220 buffer_get_used_size(buffer)); | |
221 t_pop(); | |
222 } | |
223 | |
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224 hdr.used_file_size = output->offset; |
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225 buffer_free(ctx.buffer); |
2641 | 226 buffer_free(ctx.field_seen); |
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227 |
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228 o_stream_seek(output, 0); |
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229 o_stream_send(output, &hdr, sizeof(hdr)); |
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230 |
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231 mail_cache_view_close(cache_view); |
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Cache file compression works now and compressed cache file is reopened.
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232 |
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233 if (o_stream_flush(output) < 0) { |
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234 errno = output->stream_errno; |
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235 mail_cache_set_syscall_error(cache, "o_stream_flush()"); |
4070
71b8faa84ec6
Added i_stream_destroy() and o_stream_destroy() and used them instead of
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|
236 o_stream_destroy(&output); |
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237 return -1; |
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238 } |
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|
239 |
2299 | 240 if (hdr.used_file_size < MAIL_CACHE_INITIAL_SIZE) { |
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241 /* grow the file some more. doesn't matter if it fails */ |
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242 (void)file_set_size(fd, MAIL_CACHE_INITIAL_SIZE); |
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243 } |
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Cache file compression works now and compressed cache file is reopened.
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244 |
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245 o_stream_destroy(&output); |
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246 |
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247 if (!cache->index->fsync_disable) { |
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248 if (fdatasync(fd) < 0) { |
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249 mail_cache_set_syscall_error(cache, "fdatasync()"); |
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250 return -1; |
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251 } |
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252 } |
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253 |
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254 *file_seq_r = hdr.file_seq; |
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255 return 0; |
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256 } |
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257 |
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258 static int mail_cache_compress_has_file_changed(struct mail_cache *cache) |
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259 { |
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260 struct mail_cache_header hdr; |
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261 unsigned int i; |
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262 int fd, ret; |
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263 |
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264 for (i = 0;; i++) { |
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265 fd = nfs_safe_open(cache->filepath, O_RDONLY); |
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266 if (fd == -1) { |
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267 if (errno == ENOENT) |
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268 return 0; |
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269 |
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270 mail_cache_set_syscall_error(cache, "open()"); |
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271 return -1; |
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272 } |
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273 |
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274 ret = read_full(fd, &hdr, sizeof(hdr)); |
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275 close_keep_errno(fd); |
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276 |
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277 if (ret >= 0) { |
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278 if (ret == 0) |
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279 return 0; |
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280 if (cache->need_compress_file_seq == (uint32_t)-1) { |
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281 /* previously it didn't exist */ |
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282 return 1; |
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283 } |
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284 return hdr.file_seq != cache->need_compress_file_seq; |
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285 } else if (errno != ESTALE || i >= NFS_ESTALE_RETRY_COUNT) { |
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286 mail_cache_set_syscall_error(cache, "read()"); |
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287 return -1; |
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288 } |
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289 } |
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290 } |
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291 |
2929 | 292 static int mail_cache_compress_locked(struct mail_cache *cache, |
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293 struct mail_index_transaction *trans, |
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294 bool *unlock) |
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295 { |
3106 | 296 struct dotlock *dotlock; |
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297 mode_t old_mask; |
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298 uint32_t file_seq, old_offset; |
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Declare a global uint32_t array type.
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299 ARRAY_TYPE(uint32_t) ext_offsets; |
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300 const uint32_t *offsets; |
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301 unsigned int i, count; |
4247
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302 int fd, ret; |
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303 |
5736
b3ed52bbeca7
Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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diff
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|
304 i_warning("cache compress"); |
2327
7d02e2a7672d
Header caching redesigned. New design allows caching decisions per field, so
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|
305 /* get the latest info on fields */ |
2929 | 306 if (mail_cache_header_fields_read(cache) < 0) |
2327
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307 return -1; |
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|
308 |
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309 old_mask = umask(cache->index->mode ^ 0666); |
3106 | 310 fd = file_dotlock_open(&cache->dotlock_settings, cache->filepath, |
311 0, &dotlock); | |
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312 umask(old_mask); |
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313 |
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314 if (fd == -1) { |
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|
315 mail_cache_set_syscall_error(cache, "file_dotlock_open()"); |
2247
2d51bb58a070
Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
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|
316 return -1; |
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|
317 } |
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|
318 |
4247
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319 if ((ret = mail_cache_compress_has_file_changed(cache)) != 0) { |
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320 if (ret < 0) |
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321 return -1; |
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|
322 |
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|
323 /* was just compressed, forget this */ |
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324 cache->need_compress_file_seq = 0; |
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325 file_dotlock_delete(&dotlock); |
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|
326 |
f1d77064884c
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|
327 if (*unlock) { |
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|
328 (void)mail_cache_unlock(cache); |
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|
329 *unlock = FALSE; |
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|
330 } |
f1d77064884c
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|
331 |
4247
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332 return mail_cache_reopen(cache); |
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|
333 } |
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334 |
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|
335 if (cache->index->gid != (gid_t)-1 && |
aa93c7216722
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336 fchown(fd, (uid_t)-1, cache->index->gid) < 0) { |
aa93c7216722
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|
337 mail_cache_set_syscall_error(cache, "fchown()"); |
3106 | 338 file_dotlock_delete(&dotlock); |
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339 return -1; |
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|
340 } |
aa93c7216722
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|
341 |
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|
342 t_push(); |
9404d2c41cb2
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|
343 if (mail_cache_copy(cache, trans, fd, &file_seq, &ext_offsets) < 0) { |
3106 | 344 (void)file_dotlock_delete(&dotlock); |
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When compressing cache file, update the cache file offsets using the
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|
345 t_pop(); |
2929 | 346 return -1; |
347 } | |
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|
348 |
3106 | 349 if (file_dotlock_replace(&dotlock, |
350 DOTLOCK_REPLACE_FLAG_DONT_CLOSE_FD) < 0) { | |
2929 | 351 mail_cache_set_syscall_error(cache, |
352 "file_dotlock_replace()"); | |
353 (void)close(fd); | |
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When compressing cache file, update the cache file offsets using the
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354 t_pop(); |
2929 | 355 return -1; |
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|
356 } |
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|
357 |
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358 /* once we're sure that the compression was successful, |
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When compressing cache file, update the cache file offsets using the
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|
359 update the offsets */ |
9404d2c41cb2
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|
360 mail_index_ext_reset(trans, cache->ext_id, file_seq); |
9404d2c41cb2
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361 offsets = array_get(&ext_offsets, &count); |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
362 for (i = 0; i < count; i++) { |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
363 if (offsets[i] != 0) { |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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changeset
|
364 mail_index_update_ext(trans, i + 1, cache->ext_id, |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
365 &offsets[i], &old_offset); |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
366 } |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
367 } |
9404d2c41cb2
When compressing cache file, update the cache file offsets using the
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|
368 t_pop(); |
9404d2c41cb2
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369 |
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|
370 if (*unlock) { |
f1d77064884c
Lock handling changes. Everything goes through file-lock API now and there's
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|
371 (void)mail_cache_unlock(cache); |
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Lock handling changes. Everything goes through file-lock API now and there's
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|
372 *unlock = FALSE; |
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373 } |
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374 |
2929 | 375 mail_cache_file_close(cache); |
376 cache->fd = fd; | |
377 | |
378 if (cache->file_cache != NULL) | |
379 file_cache_set_fd(cache->file_cache, cache->fd); | |
380 | |
381 if (mail_cache_map(cache, 0, 0) < 0) | |
382 return -1; | |
383 if (mail_cache_header_fields_read(cache) < 0) | |
384 return -1; | |
385 | |
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386 cache->need_compress_file_seq = 0; |
2929 | 387 return 0; |
388 } | |
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importing new index code. mbox still broken.
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389 |
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390 int mail_cache_compress(struct mail_cache *cache, |
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391 struct mail_index_transaction *trans) |
2929 | 392 { |
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393 bool unlock = FALSE; |
2929 | 394 int ret; |
395 | |
3243
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In-memory indexes work again. Just pass dir as NULL to mail_index_alloc().
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396 if (MAIL_INDEX_IS_IN_MEMORY(cache->index)) |
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397 return 0; |
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398 |
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399 if (cache->index->lock_method == FILE_LOCK_METHOD_DOTLOCK) { |
2949
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400 /* we're using dotlocking, cache file creation itself creates |
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401 the dotlock file we need. */ |
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402 return mail_cache_compress_locked(cache, trans, &unlock); |
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403 } |
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404 |
2929 | 405 switch (mail_cache_lock(cache)) { |
406 case -1: | |
407 return -1; | |
408 case 0: | |
409 /* couldn't lock, either it's broken or doesn't exist. | |
410 just start creating it. */ | |
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411 return mail_cache_compress_locked(cache, trans, &unlock); |
2929 | 412 default: |
413 /* locking succeeded. */ | |
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414 unlock = TRUE; |
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415 ret = mail_cache_compress_locked(cache, trans, &unlock); |
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416 if (unlock) { |
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417 if (mail_cache_unlock(cache) < 0) |
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418 ret = -1; |
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419 } |
2929 | 420 return ret; |
421 } | |
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422 } |
2247
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Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
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423 |
3863
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Added "bool" type and changed all ints that were used as booleans to bool.
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424 bool mail_cache_need_compress(struct mail_cache *cache) |
2247
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425 { |
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426 return cache->need_compress_file_seq != 0; |
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427 } |