Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-index/mail-cache.h @ 1956:d6941cd8afdc HEAD

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Added support for setting dirty flags for messages (TODO: undirty..) s/mail_index_record_flag/mail_cache_record_flag/
author Timo Sirainen <tss@iki.fi>
date Sun, 02 May 2004 22:24:35 +0300
parents 79790750c349
children 97bb7b127617
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1915
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1 #ifndef __MAIL_CACHE_H
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2 #define __MAIL_CACHE_H
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3
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4 #include "mail-index.h"
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5
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6 #define MAIL_CACHE_FILE_PREFIX ".cache"
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7
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8 #define MAIL_CACHE_HEADERS_COUNT 4
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9
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10 struct mail_cache;
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11 struct mail_cache_view;
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12 struct mail_cache_transaction_ctx;
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13
1956
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14 enum mail_cache_record_flag {
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15 /* If binary flags are set, it's not checked whether mail is
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16 missing CRs. So this flag may be set as an optimization for
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17 regular non-binary mails as well if it's known that it contains
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18 valid CR+LF line breaks. */
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19 MAIL_INDEX_FLAG_BINARY_HEADER = 0x0001,
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20 MAIL_INDEX_FLAG_BINARY_BODY = 0x0002,
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21
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22 /* Mail header or body is known to contain NUL characters. */
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23 MAIL_INDEX_FLAG_HAS_NULS = 0x0004,
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24 /* Mail header or body is known to not contain NUL characters. */
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25 MAIL_INDEX_FLAG_HAS_NO_NULS = 0x0008
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26 };
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27
1915
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28 enum mail_cache_field {
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29 /* fixed size fields */
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30 MAIL_CACHE_INDEX_FLAGS = 0x00000001,
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31 MAIL_CACHE_LOCATION_OFFSET = 0x00000002,
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32 MAIL_CACHE_MD5 = 0x00000004,
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33 MAIL_CACHE_SENT_DATE = 0x00000008,
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34 MAIL_CACHE_RECEIVED_DATE = 0x00000010,
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35 MAIL_CACHE_VIRTUAL_FULL_SIZE = 0x00000020,
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36 MAIL_CACHE_PHYSICAL_BODY_SIZE = 0x00000040,
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37
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38 /* variable sized field */
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39 MAIL_CACHE_HEADERS1 = 0x40000000,
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40 MAIL_CACHE_HEADERS2 = 0x20000000,
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41 MAIL_CACHE_HEADERS3 = 0x10000000,
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42 MAIL_CACHE_HEADERS4 = 0x08000000,
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43 MAIL_CACHE_LOCATION = 0x04000000,
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44 MAIL_CACHE_BODY = 0x02000000,
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45 MAIL_CACHE_BODYSTRUCTURE = 0x01000000,
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46 MAIL_CACHE_ENVELOPE = 0x00800000,
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47 MAIL_CACHE_MESSAGEPART = 0x00400000,
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48
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49 MAIL_CACHE_FIXED_MASK = MAIL_CACHE_INDEX_FLAGS |
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50 MAIL_CACHE_LOCATION_OFFSET |
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51 MAIL_CACHE_MD5 |
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52 MAIL_CACHE_SENT_DATE |
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53 MAIL_CACHE_RECEIVED_DATE |
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54 MAIL_CACHE_VIRTUAL_FULL_SIZE |
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55 MAIL_CACHE_PHYSICAL_BODY_SIZE,
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56 MAIL_CACHE_HEADERS_MASK = MAIL_CACHE_HEADERS1 |
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57 MAIL_CACHE_HEADERS2 |
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58 MAIL_CACHE_HEADERS3 |
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59 MAIL_CACHE_HEADERS4,
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60 MAIL_CACHE_STRING_MASK = MAIL_CACHE_HEADERS_MASK |
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61 MAIL_CACHE_LOCATION |
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62 MAIL_CACHE_BODY |
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63 MAIL_CACHE_BODYSTRUCTURE |
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64 MAIL_CACHE_ENVELOPE,
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65 MAIL_CACHE_BODYSTRUCTURE_MASK = MAIL_CACHE_BODY |
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66 MAIL_CACHE_BODYSTRUCTURE |
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67 MAIL_CACHE_MESSAGEPART
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68 };
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69
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70 struct mail_sent_date {
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71 time_t time;
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72 int32_t timezone;
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73 };
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74
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75 extern enum mail_cache_field mail_cache_header_fields[MAIL_CACHE_HEADERS_COUNT];
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76
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77 int mail_cache_open_or_create(struct mail_index *index);
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78 void mail_cache_free(struct mail_cache *cache);
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79
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80 void mail_cache_set_defaults(struct mail_cache *cache,
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81 enum mail_cache_field default_cache_fields,
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82 enum mail_cache_field never_cache_fields);
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83
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84 /* Compress cache file. */
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85 int mail_cache_compress(struct mail_cache *cache);
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86
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87 /* Reset the cache file, clearing all data. */
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88 int mail_cache_reset(struct mail_cache *cache);
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89
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90 /* Explicitly lock the cache file. Returns 1 if ok, 0 if nonblock is TRUE and
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91 we couldn't immediately get a lock, or -1 if error. */
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92 int mail_cache_lock(struct mail_cache *cache, int nonblock);
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93 int mail_cache_unlock(struct mail_cache *cache);
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94
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95 /* Returns TRUE if cache file is locked. */
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96 int mail_cache_is_locked(struct mail_cache *cache);
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97
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98 struct mail_cache_view *
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99 mail_cache_view_open(struct mail_cache *cache, struct mail_index_view *iview);
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100 void mail_cache_view_close(struct mail_cache_view *view);
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101
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102 /* Begin transaction. Cache transaction may be committed or rollbacked multiple
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103 times. It will finish when index transaction is committed or rollbacked.
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104 The transaction might also be partially committed automatically, so this
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105 is kind of fake transaction, it's only purpose being optimizing writes.
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106 Returns same as mail_cache_lock(). */
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107 int mail_cache_transaction_begin(struct mail_cache_view *view, int nonblock,
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108 struct mail_index_transaction *t,
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109 struct mail_cache_transaction_ctx **ctx_r);
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110 int mail_cache_transaction_commit(struct mail_cache_transaction_ctx *ctx);
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111 void mail_cache_transaction_rollback(struct mail_cache_transaction_ctx *ctx);
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112
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113 /* Should be called only by mail_transaction_commit/rollback: */
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114 int mail_cache_transaction_end(struct mail_cache_transaction_ctx *ctx);
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115
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116 /* Return NULL-terminated list of headers for given index, or NULL if
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117 header index isn't used. */
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118 const char *const *mail_cache_get_header_fields(struct mail_cache_view *view,
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119 unsigned int idx);
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120 /* Set list of headers for given index. */
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121 int mail_cache_set_header_fields(struct mail_cache_transaction_ctx *ctx,
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122 unsigned int idx, const char *const headers[]);
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123
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124 /* Add new field to given record. Updates are not allowed. Fixed size fields
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125 must be exactly the expected size and they're converted to network byte
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126 order in disk. */
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127 int mail_cache_add(struct mail_cache_transaction_ctx *ctx, uint32_t seq,
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128 enum mail_cache_field field,
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129 const void *data, size_t data_size);
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130
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131 /* Mark the given record deleted. */
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132 int mail_cache_delete(struct mail_cache_transaction_ctx *ctx, uint32_t seq);
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133
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134 /* Return all fields that are currently cached for record. */
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135 enum mail_cache_field
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136 mail_cache_get_fields(struct mail_cache_view *view, uint32_t seq);
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137
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138 /* Set data_r and size_r to point to wanted field in cache file.
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139 Returns TRUE if field was found. If field contains multiple fields,
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140 first one found is returned. This is mostly useful for finding headers. */
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141 int mail_cache_lookup_field(struct mail_cache_view *view, uint32_t seq,
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142 enum mail_cache_field field,
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143 const void **data_r, size_t *size_r);
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144
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145 /* Return string field. */
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146 const char *
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147 mail_cache_lookup_string_field(struct mail_cache_view *view, uint32_t seq,
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148 enum mail_cache_field field);
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149
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150 /* Copy fixed size field to given buffer. buffer_size must be exactly the
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151 expected size. The result will be converted to host byte order.
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152 Returns TRUE if field was found. */
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153 int mail_cache_copy_fixed_field(struct mail_cache_view *view, uint32_t seq,
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154 enum mail_cache_field field,
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155 void *buffer, size_t buffer_size);
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156
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157 /* Mark given fields as missing, ie. they should be cached when possible. */
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158 void mail_cache_mark_missing(struct mail_cache_view *view,
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159 enum mail_cache_field fields);
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160
1956
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161 /* Return record flags. */
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162 enum mail_cache_record_flag
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163 mail_cache_get_record_flags(struct mail_cache_view *view, uint32_t seq);
1915
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164
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165 /* Update record flags. The cache file must be locked and the flags must be
1915
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166 already inserted to the record. */
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167 int mail_cache_update_record_flags(struct mail_cache_view *view, uint32_t seq,
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168 enum mail_cache_record_flag flags);
1915
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169
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170 /* Update location offset. External locking is assumed to take care of locking
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171 readers out to prevent race conditions. */
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172 int mail_cache_update_location_offset(struct mail_cache_view *view,
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173 uint32_t seq, uoff_t offset);
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174
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175 /* "Error in index cache file %s: ...". */
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176 void mail_cache_set_corrupted(struct mail_cache *cache, const char *fmt, ...)
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177 __attr_format__(2, 3);
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178
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179 #endif