Mercurial > dovecot > core-2.2

annotate src/lib-index/mail-cache-private.h @ 15578:13e74bd5ac8c

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Merged changes from v2.1 tree.
author Timo Sirainen <tss@iki.fi>
date Sat, 05 Jan 2013 01:14:11 +0200
parents debecd057f9c 55e84bb452e6
children b9a312951881
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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_MAJOR_VERSION 1
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9 #define MAIL_CACHE_MINOR_VERSION 1
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10
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11 /* Drop fields that haven't been accessed for n seconds */
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12 #define MAIL_CACHE_FIELD_DROP_SECS (3600*24*30)
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13
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14 /* Never compress the file if it's smaller than this */
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15 #define MAIL_CACHE_COMPRESS_MIN_SIZE (1024*32)
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16
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17 /* Compress the file when n% of records are deleted */
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18 #define MAIL_CACHE_COMPRESS_DELETE_PERCENTAGE 20
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19
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20 /* Compress the file when n% of rows contain continued rows.
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21 200% means that there's 2 continued rows per record. */
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22 #define MAIL_CACHE_COMPRESS_CONTINUED_PERCENTAGE 200
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23
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24 /* Compress the file when we need to follow more than n next_offsets to find
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25 the latest cache header. */
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26 #define MAIL_CACHE_HEADER_FIELD_CONTINUE_COUNT 4
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27
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28 /* If cache record becomes larger than this, don't add it. */
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29 #define MAIL_CACHE_RECORD_MAX_SIZE (64*1024)
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30
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31 #define MAIL_CACHE_LOCK_TIMEOUT 10
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32 #define MAIL_CACHE_LOCK_CHANGE_TIMEOUT 300
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33
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34 #define MAIL_CACHE_IS_UNUSABLE(cache) \
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35 ((cache)->hdr == NULL)
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36
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37 struct mail_cache_header {
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38 /* version is increased only when you can't have backwards
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39 compatibility. */
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40 uint8_t major_version;
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41 uint8_t compat_sizeof_uoff_t;
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42 uint8_t minor_version;
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43 uint8_t unused;
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44
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45 uint32_t indexid;
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46 uint32_t file_seq;
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47
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48 uint32_t continued_record_count;
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49
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50 /* NOTE: old versions used this for hole offset, so we can't fully
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51 rely on it */
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52 uint32_t record_count;
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53 uint32_t backwards_compat_used_file_size;
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54 uint32_t deleted_record_count;
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55
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56 uint32_t field_header_offset;
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57 };
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58
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59 struct mail_cache_header_fields {
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60 uint32_t next_offset;
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61 uint32_t size;
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62 uint32_t fields_count;
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63
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64 #if 0
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65 /* last time the field was accessed. not updated more often than
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66 once a day. */
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67 uint32_t last_used[fields_count];
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68 /* (uint32_t)-1 for variable sized fields */
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69 uint32_t size[fields_count];
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70 /* enum mail_cache_field_type */
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71 uint8_t type[fields_count];
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72 /* enum mail_cache_decision_type */
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73 uint8_t decision[fields_count];
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74 /* NUL-separated list of field names */
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75 char name[fields_count][];
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76 #endif
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77 };
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78
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79 #define MAIL_CACHE_FIELD_LAST_USED() \
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80 (sizeof(uint32_t) * 3)
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81 #define MAIL_CACHE_FIELD_SIZE(count) \
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82 (MAIL_CACHE_FIELD_LAST_USED() + sizeof(uint32_t) * (count))
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83 #define MAIL_CACHE_FIELD_TYPE(count) \
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84 (MAIL_CACHE_FIELD_SIZE(count) + sizeof(uint32_t) * (count))
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85 #define MAIL_CACHE_FIELD_DECISION(count) \
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86 (MAIL_CACHE_FIELD_TYPE(count) + sizeof(uint8_t) * (count))
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87 #define MAIL_CACHE_FIELD_NAMES(count) \
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88 (MAIL_CACHE_FIELD_DECISION(count) + sizeof(uint8_t) * (count))
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89
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90 struct mail_cache_record {
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91 uint32_t prev_offset;
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92 uint32_t size; /* full record size, including this header */
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93 /* array of { uint32_t field; [ uint32_t size; ] { .. } } */
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94 };
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95
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96 struct mail_cache_field_private {
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97 struct mail_cache_field field;
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98
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99 uint32_t uid_highwater;
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100
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101 /* Unused fields aren't written to cache file */
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102 unsigned int used:1;
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103 unsigned int adding:1;
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104 unsigned int decision_dirty:1;
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105 };
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106
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107 struct mail_cache {
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108 struct mail_index *index;
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109 uint32_t ext_id;
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110
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111 char *filepath;
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112 int fd;
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113
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114 ino_t st_ino;
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115 dev_t st_dev;
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116
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117 size_t mmap_length;
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118 /* a) mmaping the whole file */
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119 void *mmap_base;
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120 /* b) using file cache */
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121 struct file_cache *file_cache;
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122 /* c) using small read() calls with MAIL_INDEX_OPEN_FLAG_SAVEONLY */
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123 uoff_t read_offset;
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124 buffer_t *read_buf;
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125 /* mail_cache_map() increases this always. */
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126 unsigned int remap_counter;
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127
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128 struct dotlock_settings dotlock_settings;
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129 struct dotlock *dotlock;
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130 struct file_lock *file_lock;
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131
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132 /* mmap_disable=no: hdr points to data / NULL when cache is invalid.
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133 mmap_disable=yes: hdr points to hdr_ro_copy. this is needed because
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134 cache invalidation can zero the data any time */
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135 const struct mail_cache_header *hdr;
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136 struct mail_cache_header hdr_ro_copy;
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137 /* hdr_copy gets updated when cache is locked and written when
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138 unlocking and hdr_modified=TRUE */
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139 struct mail_cache_header hdr_copy;
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140
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141 pool_t field_pool;
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406692edc12d Cache fixes. Decisions are saved again.
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142 struct mail_cache_field_private *fields;
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143 uint32_t *field_file_map;
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144 unsigned int fields_count;
14923
96fd2c3bf932 Reverted "support for non-pointers" part of the hash table API changes.
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145 HASH_TABLE(char *, void *) 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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146 uint32_t last_field_header_offset;
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147
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9c3f19110538 Don't compress cache file if it was just compressed by another process.
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148 /* 0 is no need for compression, otherwise the file sequence number
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diff changeset
149 which we want compressed. */
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150 uint32_t need_compress_file_seq;
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151
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152 unsigned int *file_field_map;
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153 unsigned int file_fields_count;
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154
4655
df8de2e47fb5 Delay opening the cache file until it's actually needed.
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155 unsigned int opened:1;
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156 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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157 unsigned int last_lock_failed:1;
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158 unsigned int hdr_modified:1;
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159 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
diff changeset
160 unsigned int compressing:1;
15313
51f2be9aa8ad lib-index: Added MAIL_INDEX_OPEN_FLAG_SAVEONLY to do only minimal reads from cache file.
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parents: 15312
diff changeset
161 unsigned int map_with_read:1;
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162 };
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163
7312
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164 struct mail_cache_loop_track {
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165 /* we're looping if size_sum > (max_offset-min_offset) */
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166 uoff_t min_offset, max_offset;
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167 uoff_t size_sum;
6f59434cf229 Optimized cache record loop tracking.
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168 };
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169
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170 struct mail_cache_view {
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171 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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172 struct mail_index_view *view, *trans_view;
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173
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174 struct mail_cache_transaction_ctx *transaction;
2315
22210d6cf238 Cache fixes. Lookups now look into transactions too.
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diff changeset
175 uint32_t trans_seq1, trans_seq2;
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176
7312
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177 struct mail_cache_loop_track loop_track;
2632
ec5601f71ba0 Fix for circular record list detection, we can't use data stack for buffer.
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parents: 2619
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178
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diff changeset
179 /* if cached_exists_buf[field] == cached_exists_value, it's cached.
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diff changeset
180 this allows us to avoid constantly clearing the whole buffer.
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diff changeset
181 it needs to be cleared only when cached_exists_value is wrapped. */
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diff changeset
182 buffer_t *cached_exists_buf;
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diff changeset
183 uint8_t cached_exists_value;
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parents: 2277
diff changeset
184 uint32_t cached_exists_seq;
13328
4a19aea565f7 lib-index: Added mail_cache_view_update_cache_decisions()
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parents: 8190
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185
4a19aea565f7 lib-index: Added mail_cache_view_update_cache_decisions()
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parents: 8190
diff changeset
186 unsigned int no_decision_updates:1;
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187 };
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188
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b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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189 struct mail_cache_iterate_field {
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190 unsigned int field_idx;
15312
0d1de37ad9d8 lib-index: Code cleanup: Removed mail_cache.data
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parents: 15311
diff changeset
191 unsigned int size;
5736
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192 const void *data;
15312
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193 uoff_t offset;
5736
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194 };
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195
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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196 struct mail_cache_lookup_iterate_ctx {
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197 struct mail_cache_view *view;
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198 unsigned int remap_counter;
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diff changeset
199 uint32_t seq;
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200
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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diff changeset
201 const struct mail_cache_record *rec;
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diff changeset
202 unsigned int pos, rec_size;
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diff changeset
203 uint32_t offset;
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204
6005
7c1e6ea4bfab mail_cache_lookup_iter_next() returned -1 if entry didn't exist, causing
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parents: 5972
diff changeset
205 unsigned int stop:1;
5736
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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parents: 5734
diff changeset
206 unsigned int failed:1;
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parents: 5734
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207 unsigned int appends_checked:1;
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diff changeset
208 };
2315
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209
8181
5c0c674eae1a mail_cache_lock(): Return -1 if locking times out.
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diff changeset
210 /* 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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parents: 7312
diff changeset
211 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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parents: 5736
diff changeset
212 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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parents: 8187
diff changeset
213 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
214 /* 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
215 int mail_cache_unlock(struct mail_cache *cache);
2277
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parents: 2276
diff changeset
216
3375
9e2abc4c341c Whenever writing to cache file, also updated file_cache. Fixes problems with
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parents: 3191
diff changeset
217 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
218 uoff_t offset);
15190
60c4815778fb lib-index: Simplified writing to dovecot.index.cache file.
Timo Sirainen <tss@iki.fi>
parents: 14923
diff changeset
219 int mail_cache_append(struct mail_cache *cache, const void *data, size_t size,
15371
67afcb730109 lib-index: Cache record linking is now while writing new records, not later with pwrite().
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parents: 15337
diff changeset
220 uint32_t *offset);
3375
9e2abc4c341c Whenever writing to cache file, also updated file_cache. Fixes problems with
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parents: 3191
diff changeset
221
2327
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parents: 2315
diff changeset
222 int mail_cache_header_fields_read(struct mail_cache *cache);
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parents: 2315
diff changeset
223 int mail_cache_header_fields_update(struct mail_cache *cache);
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parents: 2315
diff changeset
224 void mail_cache_header_fields_get(struct mail_cache *cache, buffer_t *dest);
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parents: 2315
diff changeset
225 int mail_cache_header_fields_get_next_offset(struct mail_cache *cache,
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parents: 2315
diff changeset
226 uint32_t *offset_r);
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diff changeset
227
7138
876c7bca351c Link cache records together directly when writing the new records, instead
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diff changeset
228 uint32_t mail_cache_lookup_cur_offset(struct mail_index_view *view,
876c7bca351c Link cache records together directly when writing the new records, instead
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parents: 7105
diff changeset
229 uint32_t seq, uint32_t *reset_id_r);
2917
e657c7874962 Crashfixes for reading corrupted cache files.
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parents: 2866
diff changeset
230 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
231 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
232 uint32_t mail_cache_get_first_new_seq(struct mail_index_view *view);
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diff changeset
233
7312
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diff changeset
234 /* Returns TRUE if offset..size area has been tracked before.
6f59434cf229 Optimized cache record loop tracking.
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diff changeset
235 Returns FALSE if the area may or may not have been tracked before,
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parents: 7138
diff changeset
236 but we don't know for sure yet. */
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diff changeset
237 bool mail_cache_track_loops(struct mail_cache_loop_track *loop_track,
6f59434cf229 Optimized cache record loop tracking.
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parents: 7138
diff changeset
238 uoff_t offset, uoff_t size);
5736
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diff changeset
239
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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parents: 5734
diff changeset
240 /* Iterate through a message's cached fields. */
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Timo Sirainen <tss@iki.fi>
parents: 5734
diff changeset
241 void mail_cache_lookup_iter_init(struct mail_cache_view *view, uint32_t seq,
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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parents: 5734
diff changeset
242 struct mail_cache_lookup_iterate_ctx *ctx_r);
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parents: 5734
diff changeset
243 /* Returns 1 if field was returned, 0 if end of fields, or -1 if error */
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parents: 5734
diff changeset
244 int mail_cache_lookup_iter_next(struct mail_cache_lookup_iterate_ctx *ctx,
b3ed52bbeca7 Changed mail_cache_foreach() to be an iterator: mail_cache_lookup_iter_*()
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parents: 5734
diff changeset
245 struct mail_cache_iterate_field *field_r);
1915
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parents:
diff changeset
246
15311
022d0d21e56d lib-index: mail_cache_map() API cleanup
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parents: 14083
diff changeset
247 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
248 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
249 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
250 int mail_cache_reopen(struct mail_cache *cache);
2247
2d51bb58a070 Added some smartness for deciding what to cache. Cache compression code compiles, but untested.
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parents: 2201
diff changeset
251
15374
debecd057f9c lib-index: Replaced cache's deleted_space with deleted_record_count.
Timo Sirainen <tss@iki.fi>
parents: 15373
diff changeset
252 void mail_cache_delete(struct mail_cache *cache);
2276
5f374049abdb Caching fixes and optimizations. Removed all network byte ordering code -
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parents: 2275
diff changeset
253
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
254 /* 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
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parents: 6841
diff changeset
255 This should be called even for fields that aren't currently in cache file */
5734
5f0832288007 Cache code cleanups
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parents: 5002
diff changeset
256 void mail_cache_decision_state_update(struct mail_cache_view *view,
5f0832288007 Cache code cleanups
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parents: 5002
diff changeset
257 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
258 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
259 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
260
2853
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261 int mail_cache_expunge_handler(struct mail_index_sync_map_ctx *sync_ctx,
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parents: 4451
diff changeset
262 uint32_t seq, const void *data,
56d17f2e1d66 Added support for calling expunge handler for an extension even if the
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parents: 4451
diff changeset
263 void **sync_context, void *context);
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512dd7d76cdc Removed cache_offset from mail_index_record and changed it to use extension
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parents: 2632
diff changeset
264
1915
79790750c349 importing new index code. mbox still broken.
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parents:
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265 void mail_cache_set_syscall_error(struct mail_cache *cache,
79790750c349 importing new index code. mbox still broken.
Timo Sirainen <tss@iki.fi>
parents:
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266 const char *function);
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parents:
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267
79790750c349 importing new index code. mbox still broken.
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parents:
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268 #endif