Mercurial > dovecot > core-2.2

annotate src/lib-index/mail-cache-private.h @ 15313:51f2be9aa8ad

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lib-index: Added MAIL_INDEX_OPEN_FLAG_SAVEONLY to do only minimal reads from cache file.
author Timo Sirainen <tss@iki.fi>
date Thu, 18 Oct 2012 05:22:36 +0300
parents 0d1de37ad9d8
children 1b46c1bf9d1e 55e84bb452e6
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6410
e4eb71ae8e96 Changed .h ifdef/defines to use <NAME>_H format.
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1 #ifndef MAIL_CACHE_PRIVATE_H
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2 #define MAIL_CACHE_PRIVATE_H
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3
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4 #include "file-dotlock.h"
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5 #include "mail-index-private.h"
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6 #include "mail-cache.h"
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7
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8 #define MAIL_CACHE_VERSION 1
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9
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10 /* Drop fields that haven't been accessed for n seconds */
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11 #define MAIL_CACHE_FIELD_DROP_SECS (3600*24*30)
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12
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13 /* Never compress the file if it's smaller than this */
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14 #define MAIL_CACHE_COMPRESS_MIN_SIZE (1024*50)
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15
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16 /* Don't bother remembering holes smaller than this */
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17 #define MAIL_CACHE_MIN_HOLE_SIZE 1024
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18
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19 /* Compress the file when deleted space reaches n% of total size */
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20 #define MAIL_CACHE_COMPRESS_PERCENTAGE 20
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21
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22 /* Compress the file when n% of rows contain continued rows.
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23 200% means that there's 2 continued rows per record. */
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24 #define MAIL_CACHE_COMPRESS_CONTINUED_PERCENTAGE 200
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25
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26 /* Compress the file when we need to follow more than n next_offsets to find
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27 the latest cache header. */
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28 #define MAIL_CACHE_HEADER_FIELD_CONTINUE_COUNT 4
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29
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30 /* Initial size for the file */
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31 #define MAIL_CACHE_INITIAL_SIZE (sizeof(struct mail_cache_header) + 10240)
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32
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33 /* When more space is needed, grow the file n% larger than the previous size */
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34 #define MAIL_CACHE_GROW_PERCENTAGE 10
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35
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36 /* When allocating space for transactions, don't use blocks larger than this. */
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37 #define MAIL_CACHE_MAX_RESERVED_BLOCK_SIZE (1024*512)
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38
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39 #define MAIL_CACHE_LOCK_TIMEOUT 10
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40 #define MAIL_CACHE_LOCK_CHANGE_TIMEOUT 300
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41
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42 #define MAIL_CACHE_IS_UNUSABLE(cache) \
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43 ((cache)->hdr == NULL)
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44
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45 struct mail_cache_header {
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46 /* version is increased only when you can't have backwards
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47 compatibility. */
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48 uint8_t version;
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49 uint8_t compat_sizeof_uoff_t;
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50 uint8_t unused[2];
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51
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52 uint32_t indexid;
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53 uint32_t file_seq;
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54
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55 uint32_t continued_record_count;
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56
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57 uint32_t hole_offset;
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58 uint32_t used_file_size;
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59 uint32_t deleted_space;
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60
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61 uint32_t field_header_offset;
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62 };
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63
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64 struct mail_cache_header_fields {
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65 uint32_t next_offset;
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66 uint32_t size;
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67 uint32_t fields_count;
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68
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69 #if 0
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70 /* last time the field was accessed. not updated more often than
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71 once a day. */
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72 uint32_t last_used[fields_count];
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73 /* (uint32_t)-1 for variable sized fields */
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74 uint32_t size[fields_count];
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75 /* enum mail_cache_field_type */
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76 uint8_t type[fields_count];
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77 /* enum mail_cache_decision_type */
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78 uint8_t decision[fields_count];
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79 /* NUL-separated list of field names */
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80 char name[fields_count][];
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81 #endif
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82 };
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83
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84 #define MAIL_CACHE_FIELD_LAST_USED() \
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85 (sizeof(uint32_t) * 3)
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86 #define MAIL_CACHE_FIELD_SIZE(count) \
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87 (MAIL_CACHE_FIELD_LAST_USED() + sizeof(uint32_t) * (count))
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88 #define MAIL_CACHE_FIELD_TYPE(count) \
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89 (MAIL_CACHE_FIELD_SIZE(count) + sizeof(uint32_t) * (count))
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90 #define MAIL_CACHE_FIELD_DECISION(count) \
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91 (MAIL_CACHE_FIELD_TYPE(count) + sizeof(uint8_t) * (count))
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92 #define MAIL_CACHE_FIELD_NAMES(count) \
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93 (MAIL_CACHE_FIELD_DECISION(count) + sizeof(uint8_t) * (count))
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94
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95 struct mail_cache_record {
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96 uint32_t prev_offset;
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97 uint32_t size; /* full record size, including this header */
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98 /* array of { uint32_t field; [ uint32_t size; ] { .. } } */
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99 };
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100
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101 struct mail_cache_hole_header {
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102 uint32_t next_offset; /* 0 if no holes left */
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103 uint32_t size; /* including this header */
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104
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105 /* make sure we notice if we're treating hole as mail_cache_record.
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106 magic is a large number so if it's treated as size field, it'll
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107 point outside the file */
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108 #define MAIL_CACHE_HOLE_HEADER_MAGIC 0xffeedeff
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109 uint32_t magic;
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110 };
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111
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112 struct mail_cache_field_private {
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113 struct mail_cache_field field;
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114
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115 uint32_t uid_highwater;
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116
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117 /* Unused fields aren't written to cache file */
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118 unsigned int used:1;
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119 unsigned int adding:1;
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120 unsigned int decision_dirty:1;
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121 };
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122
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123 struct mail_cache {
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124 struct mail_index *index;
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125 uint32_t ext_id;
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126
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127 char *filepath;
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128 int fd;
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129
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130 ino_t st_ino;
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131 dev_t st_dev;
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132
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133 size_t mmap_length;
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134 /* a) mmaping the whole file */
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135 void *mmap_base;
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136 /* b) using file cache */
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137 struct file_cache *file_cache;
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138 /* c) using small read() calls with MAIL_INDEX_OPEN_FLAG_SAVEONLY */
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139 uoff_t read_offset;
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140 buffer_t *read_buf;
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141 /* mail_cache_map() increases this always. */
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142 unsigned int remap_counter;
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9c4aa309dbac Changed dotlocking API.
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143
9c4aa309dbac Changed dotlocking API.
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144 struct dotlock_settings dotlock_settings;
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145 struct dotlock *dotlock;
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f1d77064884c Lock handling changes. Everything goes through file-lock API now and there's
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146 struct file_lock *file_lock;
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147
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148 /* mmap_disable=no: hdr points to data / NULL when cache is invalid.
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149 mmap_disable=yes: hdr points to hdr_ro_copy. this is needed because
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150 cache invalidation can zero the data any time */
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151 const struct mail_cache_header *hdr;
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152 struct mail_cache_header hdr_ro_copy;
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153 /* hdr_copy gets updated when cache is locked and written when
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154 unlocking and hdr_modified=TRUE */
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155 struct mail_cache_header hdr_copy;
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156
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157 pool_t field_pool;
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158 struct mail_cache_field_private *fields;
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159 uint32_t *field_file_map;
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160 unsigned int fields_count;
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161 struct hash_table *field_name_hash; /* name -> idx */
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68bb5bec043e When reading the latest fields, begin finding the fields from the last known
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162 uint32_t last_field_header_offset;
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163
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164 /* 0 is no need for compression, otherwise the file sequence number
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165 which we want compressed. */
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166 uint32_t need_compress_file_seq;
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167
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168 unsigned int *file_field_map;
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169 unsigned int file_fields_count;
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170
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df8de2e47fb5 Delay opening the cache file until it's actually needed.
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171 unsigned int opened:1;
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172 unsigned int locked:1;
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9902de77194e Mail cache: If locking failed, the next time try to lock it only once.
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173 unsigned int last_lock_failed:1;
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174 unsigned int hdr_modified:1;
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175 unsigned int field_header_write_pending:1;
8187
f1203dce2d8c Mail cache: lock_method=dotlock could have caused a process to deadlock with itself.
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parents: 8182
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176 unsigned int compressing:1;
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177 unsigned int map_with_read:1;
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178 };
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179
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180 struct mail_cache_loop_track {
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181 /* we're looping if size_sum > (max_offset-min_offset) */
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182 uoff_t min_offset, max_offset;
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183 uoff_t size_sum;
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184 };
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185
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186 struct mail_cache_view {
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187 struct mail_cache *cache;
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512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
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188 struct mail_index_view *view, *trans_view;
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189
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190 struct mail_cache_transaction_ctx *transaction;
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22210d6cf238 Cache fixes. Lookups now look into transactions too.
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191 uint32_t trans_seq1, trans_seq2;
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192
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193 struct mail_cache_loop_track loop_track;
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ec5601f71ba0 Fix for circular record list detection, we can't use data stack for buffer.
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194
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195 /* if cached_exists_buf[field] == cached_exists_value, it's cached.
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196 this allows us to avoid constantly clearing the whole buffer.
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197 it needs to be cleared only when cached_exists_value is wrapped. */
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198 buffer_t *cached_exists_buf;
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199 uint8_t cached_exists_value;
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200 uint32_t cached_exists_seq;
13328
4a19aea565f7 lib-index: Added mail_cache_view_update_cache_decisions()
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201
4a19aea565f7 lib-index: Added mail_cache_view_update_cache_decisions()
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diff changeset
202 unsigned int no_decision_updates:1;
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203 };
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204
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205 struct mail_cache_iterate_field {
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206 unsigned int field_idx;
15312
0d1de37ad9d8 lib-index: Code cleanup: Removed mail_cache.data
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diff changeset
207 unsigned int size;
5736
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208 const void *data;
15312
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209 uoff_t offset;
5736
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210 };
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211
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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diff changeset
212 struct mail_cache_lookup_iterate_ctx {
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213 struct mail_cache_view *view;
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214 unsigned int remap_counter;
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diff changeset
215 uint32_t seq;
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216
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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217 const struct mail_cache_record *rec;
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218 unsigned int pos, rec_size;
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diff changeset
219 uint32_t offset;
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220
6005
7c1e6ea4bfab mail_cache_lookup_iter_next() returned -1 if entry didn't exist, causing
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parents: 5972
diff changeset
221 unsigned int stop:1;
5736
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222 unsigned int failed:1;
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223 unsigned int appends_checked:1;
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224 };
2315
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225
8181
5c0c674eae1a mail_cache_lock(): Return -1 if locking times out.
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226 /* Explicitly lock the cache file. Returns -1 if error / timed out,
5c0c674eae1a mail_cache_lock(): Return -1 if locking times out.
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227 1 if ok, 0 if cache is broken/doesn't exist */
5947
7ebe0593f488 Don't create cache file until something is actually being added to it.
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228 int mail_cache_lock(struct mail_cache *cache, bool require_same_reset_id);
8188
2db48458d73b Mail cache compression: If we can't get lock immediately, do it later.
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229 int mail_cache_try_lock(struct mail_cache *cache);
3627
c0e35566dd14 Unlocking cache file can also corrupt it since it modifies it. Added a
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parents: 3375
diff changeset
230 /* Returns -1 if cache is / just got corrupted, 0 if ok. */
c0e35566dd14 Unlocking cache file can also corrupt it since it modifies it. Added a
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parents: 3375
diff changeset
231 int mail_cache_unlock(struct mail_cache *cache);
2277
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parents: 2276
diff changeset
232
3375
9e2abc4c341c Whenever writing to cache file, also updated file_cache. Fixes problems with
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parents: 3191
diff changeset
233 int mail_cache_write(struct mail_cache *cache, const void *data, size_t size,
9e2abc4c341c Whenever writing to cache file, also updated file_cache. Fixes problems with
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parents: 3191
diff changeset
234 uoff_t offset);
9e2abc4c341c Whenever writing to cache file, also updated file_cache. Fixes problems with
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parents: 3191
diff changeset
235
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diff changeset
236 int mail_cache_header_fields_read(struct mail_cache *cache);
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diff changeset
237 int mail_cache_header_fields_update(struct mail_cache *cache);
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parents: 2315
diff changeset
238 void mail_cache_header_fields_get(struct mail_cache *cache, buffer_t *dest);
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parents: 2315
diff changeset
239 int mail_cache_header_fields_get_next_offset(struct mail_cache *cache,
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diff changeset
240 uint32_t *offset_r);
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diff changeset
241
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876c7bca351c Link cache records together directly when writing the new records, instead
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parents: 7105
diff changeset
242 uint32_t mail_cache_lookup_cur_offset(struct mail_index_view *view,
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parents: 7105
diff changeset
243 uint32_t seq, uint32_t *reset_id_r);
2917
e657c7874962 Crashfixes for reading corrupted cache files.
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parents: 2866
diff changeset
244 int mail_cache_get_record(struct mail_cache *cache, uint32_t offset,
e657c7874962 Crashfixes for reading corrupted cache files.
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parents: 2866
diff changeset
245 const struct mail_cache_record **rec_r);
6841
0c970b3493ac mail_cache_field_want_add(): Return TRUE for temp fields only if we're
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parents: 6829
diff changeset
246 uint32_t mail_cache_get_first_new_seq(struct mail_index_view *view);
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247
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248 /* Returns TRUE if offset..size area has been tracked before.
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249 Returns FALSE if the area may or may not have been tracked before,
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diff changeset
250 but we don't know for sure yet. */
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diff changeset
251 bool mail_cache_track_loops(struct mail_cache_loop_track *loop_track,
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diff changeset
252 uoff_t offset, uoff_t size);
5736
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253
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diff changeset
254 /* Iterate through a message's cached fields. */
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diff changeset
255 void mail_cache_lookup_iter_init(struct mail_cache_view *view, uint32_t seq,
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diff changeset
256 struct mail_cache_lookup_iterate_ctx *ctx_r);
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diff changeset
257 /* Returns 1 if field was returned, 0 if end of fields, or -1 if error */
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diff changeset
258 int mail_cache_lookup_iter_next(struct mail_cache_lookup_iterate_ctx *ctx,
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diff changeset
259 struct mail_cache_iterate_field *field_r);
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diff changeset
260
15311
022d0d21e56d lib-index: mail_cache_map() API cleanup
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parents: 14083
diff changeset
261 int mail_cache_map(struct mail_cache *cache, size_t offset, size_t size,
022d0d21e56d lib-index: mail_cache_map() API cleanup
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parents: 14083
diff changeset
262 const void **data_r);
2247
2d51bb58a070 Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
Timo Sirainen <tss@iki.fi>
parents: 2201
diff changeset
263 void mail_cache_file_close(struct mail_cache *cache);
2275
c68a3c9f6d73 Cache file compression works now and compressed cache file is reopened.
Timo Sirainen <tss@iki.fi>
parents: 2247
diff changeset
264 int mail_cache_reopen(struct mail_cache *cache);
2247
2d51bb58a070 Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
Timo Sirainen <tss@iki.fi>
parents: 2201
diff changeset
265
2277
41e56f28d085 Cache updating is done now by first reserving space where to write, and then
Timo Sirainen <tss@iki.fi>
parents: 2276
diff changeset
266 /* Update new_offset's prev_offset field to old_offset. */
2276
5f374049abdb Caching fixes and optimizations. Removed all network byte ordering code -
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parents: 2275
diff changeset
267 int mail_cache_link(struct mail_cache *cache, uint32_t old_offset,
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parents: 2275
diff changeset
268 uint32_t new_offset);
2277
41e56f28d085 Cache updating is done now by first reserving space where to write, and then
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parents: 2276
diff changeset
269 /* Mark record in given offset to be deleted. */
41e56f28d085 Cache updating is done now by first reserving space where to write, and then
Timo Sirainen <tss@iki.fi>
parents: 2276
diff changeset
270 int mail_cache_delete(struct mail_cache *cache, uint32_t offset);
2276
5f374049abdb Caching fixes and optimizations. Removed all network byte ordering code -
Timo Sirainen <tss@iki.fi>
parents: 2275
diff changeset
271
7076
3cb00348ed06 Update caching decision for fields even if it doesn't currently exist in the
Timo Sirainen <tss@iki.fi>
parents: 6841
diff changeset
272 /* Notify the decision handling code that field was looked up for seq.
3cb00348ed06 Update caching decision for fields even if it doesn't currently exist in the
Timo Sirainen <tss@iki.fi>
parents: 6841
diff changeset
273 This should be called even for fields that aren't currently in cache file */
5734
5f0832288007 Cache code cleanups
Timo Sirainen <tss@iki.fi>
parents: 5002
diff changeset
274 void mail_cache_decision_state_update(struct mail_cache_view *view,
5f0832288007 Cache code cleanups
Timo Sirainen <tss@iki.fi>
parents: 5002
diff changeset
275 uint32_t seq, unsigned int field);
2298
5beb0c20b6e8 Cache file fixes, API changes, etc. It's still in somewhat ugly state, but
Timo Sirainen <tss@iki.fi>
parents: 2277
diff changeset
276 void mail_cache_decision_add(struct mail_cache_view *view, uint32_t seq,
2999
1d328531c466 mail_cache_decision_*() prototypes were wrong.
Timo Sirainen <tss@iki.fi>
parents: 2941
diff changeset
277 unsigned int field);
2200
97bb7b127617 Beginnings of getting cache file working again. Easy to break currently, but
Timo Sirainen <tss@iki.fi>
parents: 1915
diff changeset
278
2853
512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
Timo Sirainen <tss@iki.fi>
parents: 2632
diff changeset
279 int mail_cache_expunge_handler(struct mail_index_sync_map_ctx *sync_ctx,
4490
56d17f2e1d66 Added support for calling expunge handler for an extension even if the
Timo Sirainen <tss@iki.fi>
parents: 4451
diff changeset
280 uint32_t seq, const void *data,
56d17f2e1d66 Added support for calling expunge handler for an extension even if the
Timo Sirainen <tss@iki.fi>
parents: 4451
diff changeset
281 void **sync_context, void *context);
2853
512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
Timo Sirainen <tss@iki.fi>
parents: 2632
diff changeset
282 int mail_cache_sync_handler(struct mail_index_sync_map_ctx *sync_ctx,
512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
Timo Sirainen <tss@iki.fi>
parents: 2632
diff changeset
283 uint32_t seq, void *old_data, const void *new_data,
512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
Timo Sirainen <tss@iki.fi>
parents: 2632
diff changeset
284 void **context);
2934
c3ae75597952 Added "sync lost" handlers which are called with mmap_disable=yes when index
Timo Sirainen <tss@iki.fi>
parents: 2917
diff changeset
285 void mail_cache_sync_lost_handler(struct mail_index *index);
2853
512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
Timo Sirainen <tss@iki.fi>
parents: 2632
diff changeset
286
1915
79790750c349 importing new index code. mbox still broken.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
287 void mail_cache_set_syscall_error(struct mail_cache *cache,
79790750c349 importing new index code. mbox still broken.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
288 const char *function);
79790750c349 importing new index code. mbox still broken.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
289
79790750c349 importing new index code. mbox still broken.
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
290 #endif