Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mail-transaction-log.h @ 9318:9445831aebc0 HEAD
lib-index: Added support for reading new records generated by Dovecot v2.0.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Thu, 13 Aug 2009 14:50:41 -0400 |
parents | c8d63b42e9cc |
children | e5d38150be58 |
rev | line source |
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Changed .h ifdef/defines to use <NAME>_H format.
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1 #ifndef MAIL_TRANSACTION_LOG_H |
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2 #define MAIL_TRANSACTION_LOG_H |
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3 |
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4 struct mail_index; |
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5 struct mail_index_transaction; |
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6 |
9041 | 7 #define MAIL_TRANSACTION_LOG_SUFFIX ".log" |
8 | |
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9 #define MAIL_TRANSACTION_LOG_MAJOR_VERSION 1 |
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10 #define MAIL_TRANSACTION_LOG_MINOR_VERSION 2 |
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11 #define MAIL_TRANSACTION_LOG_HEADER_MIN_SIZE 24 |
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12 |
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13 struct mail_transaction_log_header { |
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14 uint8_t major_version; |
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15 uint8_t minor_version; |
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16 uint16_t hdr_size; |
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17 |
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18 uint32_t indexid; |
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19 uint32_t file_seq; |
1940 | 20 uint32_t prev_file_seq; |
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21 uint32_t prev_file_offset; |
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22 uint32_t create_stamp; |
8266 | 23 uint64_t initial_modseq; /* v1.1+ (note: log's major/minor version) */ |
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24 |
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25 uint8_t compat_flags; /* enum mail_index_header_compat_flags, v1.2+ */ |
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26 uint8_t unused[3]; |
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27 uint32_t unused2; /* so that this struct is 64bit aligned */ |
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28 }; |
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29 |
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30 enum mail_transaction_type { |
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31 MAIL_TRANSACTION_EXPUNGE = 0x00000001, |
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32 MAIL_TRANSACTION_APPEND = 0x00000002, |
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33 MAIL_TRANSACTION_FLAG_UPDATE = 0x00000004, |
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34 MAIL_TRANSACTION_HEADER_UPDATE = 0x00000020, |
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35 MAIL_TRANSACTION_EXT_INTRO = 0x00000040, |
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36 MAIL_TRANSACTION_EXT_RESET = 0x00000080, |
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37 MAIL_TRANSACTION_EXT_HDR_UPDATE = 0x00000100, |
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38 MAIL_TRANSACTION_EXT_REC_UPDATE = 0x00000200, |
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39 MAIL_TRANSACTION_KEYWORD_UPDATE = 0x00000400, |
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40 MAIL_TRANSACTION_KEYWORD_RESET = 0x00000800, |
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41 MAIL_TRANSACTION_EXPUNGE_GUID = 0x00002000, |
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42 MAIL_TRANSACTION_UID_UPDATE = 0x00004000, |
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43 MAIL_TRANSACTION_MODSEQ_UPDATE = 0x00008000, |
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44 |
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45 MAIL_TRANSACTION_TYPE_MASK = 0x0000ffff, |
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46 |
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47 #define MAIL_TRANSACTION_EXT_MASK \ |
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48 (MAIL_TRANSACTION_EXT_INTRO | MAIL_TRANSACTION_EXT_RESET | \ |
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49 MAIL_TRANSACTION_EXT_HDR_UPDATE | MAIL_TRANSACTION_EXT_REC_UPDATE) |
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50 |
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51 /* since we'll expunge mails based on data read from transaction log, |
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52 try to avoid the possibility of corrupted transaction log expunging |
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53 messages. this value is ORed to the actual MAIL_TRANSACTION_EXPUNGE |
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54 flag. if it's not present, assume corrupted log. */ |
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55 MAIL_TRANSACTION_EXPUNGE_PROT = 0x0000cd90, |
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56 |
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57 /* Mailbox synchronization noticed this change. */ |
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58 MAIL_TRANSACTION_EXTERNAL = 0x10000000 |
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59 }; |
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60 |
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61 struct mail_transaction_header { |
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62 uint32_t size; |
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63 uint32_t type; /* enum mail_transaction_type */ |
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64 }; |
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65 |
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66 struct mail_transaction_uid_update { |
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67 uint32_t old_uid, new_uid; |
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68 }; |
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69 |
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70 struct mail_transaction_modseq_update { |
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71 uint32_t uid; |
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72 /* don't use uint64_t here. it adds extra 32 bits of paddiong and also |
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73 causes problems with CPUs that require alignment */ |
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74 uint32_t modseq_low32; |
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75 uint32_t modseq_high32; |
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76 }; |
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77 |
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78 struct mail_transaction_expunge { |
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79 uint32_t uid1, uid2; |
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80 }; |
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81 |
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82 struct mail_transaction_expunge_guid { |
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83 uint32_t uid; |
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84 uint8_t guid_128[16]; |
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85 }; |
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86 |
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87 struct mail_transaction_flag_update { |
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88 uint32_t uid1, uid2; |
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89 uint8_t add_flags; |
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90 uint8_t remove_flags; |
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91 uint16_t padding; |
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92 }; |
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93 |
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94 struct mail_transaction_keyword_update { |
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95 uint8_t modify_type; /* enum modify_type : MODIFY_ADD / MODIFY_REMOVE */ |
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96 uint8_t padding; |
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97 uint16_t name_size; |
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98 /* unsigned char name[]; |
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99 array of { uint32_t uid1, uid2; } |
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100 */ |
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101 }; |
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102 |
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103 struct mail_transaction_keyword_reset { |
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104 uint32_t uid1, uid2; |
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105 }; |
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106 |
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107 struct mail_transaction_header_update { |
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108 uint16_t offset; |
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109 uint16_t size; |
2410 | 110 /* unsigned char data[]; */ |
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111 }; |
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112 |
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113 enum { |
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114 /* Don't shrink hdr_size, record_size or record_align but grow them |
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115 if necessary. */ |
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116 MAIL_TRANSACTION_EXT_INTRO_FLAG_NO_SHRINK = 0x01 |
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117 }; |
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118 |
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119 struct mail_transaction_ext_intro { |
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120 /* old extension: set ext_id. don't set name. |
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121 new extension: ext_id = (uint32_t)-1. give name. */ |
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122 uint32_t ext_id; |
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123 uint32_t reset_id; |
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124 uint32_t hdr_size; |
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125 uint16_t record_size; |
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126 uint16_t record_align; |
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127 uint16_t flags; |
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128 uint16_t name_size; |
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129 /* unsigned char name[]; */ |
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130 }; |
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131 |
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132 struct mail_transaction_ext_reset { |
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133 uint32_t new_reset_id; |
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134 uint8_t preserve_data; |
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135 uint8_t unused_padding[3]; |
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136 }; |
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137 |
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138 /* these are set for the last ext_intro */ |
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139 struct mail_transaction_ext_hdr_update { |
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140 uint16_t offset; |
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141 uint16_t size; |
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142 /* unsigned char data[]; */ |
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143 }; |
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144 |
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145 struct mail_transaction_ext_rec_update { |
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146 uint32_t uid; |
2410 | 147 /* unsigned char data[]; */ |
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148 }; |
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149 |
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150 #define LOG_IS_BEFORE(seq1, offset1, seq2, offset2) \ |
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151 (((offset1) < (offset2) && (seq1) == (seq2)) || (seq1) < (seq2)) |
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152 |
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153 struct mail_transaction_log * |
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154 mail_transaction_log_alloc(struct mail_index *index); |
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155 void mail_transaction_log_free(struct mail_transaction_log **log); |
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156 |
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157 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's |
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158 is corrupted, -1 if there was some I/O error. */ |
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159 int mail_transaction_log_open(struct mail_transaction_log *log); |
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160 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */ |
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161 int mail_transaction_log_create(struct mail_transaction_log *log, bool reset); |
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162 /* Close all the open transactions log files. */ |
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163 void mail_transaction_log_close(struct mail_transaction_log *log); |
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164 |
5819 | 165 /* Notify of indexid change */ |
166 void mail_transaction_log_indexid_changed(struct mail_transaction_log *log); | |
167 | |
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168 /* Returns the file seq/offset where the mailbox is currently synced at. |
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169 Since the log is rotated only when mailbox is fully synced, the sequence |
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170 points always to the latest file. This function doesn't actually find the |
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171 latest sync position, so you'll need to use eg. log_view_set() before |
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172 calling this. */ |
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173 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log, |
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174 uint32_t *file_seq_r, |
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175 uoff_t *file_offset_r); |
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176 /* Set the current mailbox sync position. file_seq must always be the latest |
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177 log file's sequence. The offset written automatically to the log when |
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178 other transactions are being written. */ |
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179 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log, |
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180 uint32_t file_seq, |
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181 uoff_t file_offset); |
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182 |
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183 struct mail_transaction_log_view * |
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184 mail_transaction_log_view_open(struct mail_transaction_log *log); |
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185 void mail_transaction_log_view_close(struct mail_transaction_log_view **view); |
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186 |
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187 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok. |
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188 reset_r=TRUE if the whole index should be reset before applying any |
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189 changes. */ |
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190 int mail_transaction_log_view_set(struct mail_transaction_log_view *view, |
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191 uint32_t min_file_seq, uoff_t min_file_offset, |
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192 uint32_t max_file_seq, uoff_t max_file_offset, |
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193 bool *reset_r); |
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194 /* Clear the view. Keep oldest_file_seq and newer log files referenced so we |
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195 don't get desynced. */ |
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196 void mail_transaction_log_view_clear(struct mail_transaction_log_view *view, |
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197 uint32_t oldest_file_seq); |
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198 |
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199 /* Read next transaction record from current position. The position is updated. |
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200 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */ |
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201 int mail_transaction_log_view_next(struct mail_transaction_log_view *view, |
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202 const struct mail_transaction_header **hdr_r, |
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203 const void **data_r); |
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204 /* Mark the current view's position to the record returned previously with |
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205 _log_view_next(). */ |
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206 void mail_transaction_log_view_mark(struct mail_transaction_log_view *view); |
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207 /* Seek to previously marked position. */ |
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208 void mail_transaction_log_view_rewind(struct mail_transaction_log_view *view); |
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209 |
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210 /* Returns the position of the record returned previously with |
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211 mail_transaction_log_view_next() */ |
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212 void |
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213 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view, |
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214 uint32_t *file_seq_r, |
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215 uoff_t *file_offset_r); |
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216 /* Return the modseq of the change returned previously with _view_next(). */ |
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217 uint64_t |
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218 mail_transaction_log_view_get_prev_modseq(struct mail_transaction_log_view *view); |
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219 /* Returns TRUE if we're at the end of the view window. */ |
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220 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view); |
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221 |
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222 /* Marks the log file in current position to be corrupted. */ |
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223 void |
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224 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view, |
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225 const char *fmt, ...) |
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226 ATTR_FORMAT(2, 3); |
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227 bool |
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228 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view); |
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229 |
1942 | 230 void mail_transaction_log_views_close(struct mail_transaction_log *log); |
231 | |
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232 /* Write data to transaction log. This is atomic operation. Sequences in |
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233 updates[] and expunges[] are relative to given view, they're modified |
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234 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r |
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235 will be set to 0. */ |
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236 int mail_transaction_log_append(struct mail_index_transaction *t, |
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237 uint32_t *log_file_seq_r, |
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238 uoff_t *log_file_offset_r); |
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239 |
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240 /* Lock transaction log for index synchronization. Log cannot be read or |
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241 written to while it's locked. Returns end offset. */ |
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242 int mail_transaction_log_sync_lock(struct mail_transaction_log *log, |
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243 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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244 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log); |
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245 /* Returns the current head. Works only when log is locked. */ |
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246 void mail_transaction_log_get_head(struct mail_transaction_log *log, |
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247 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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248 /* Returns TRUE if given seq/offset is current head log's rotate point. */ |
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249 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log, |
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250 uint32_t file_seq, uoff_t file_offset); |
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251 |
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252 /* Move currently opened log head file to memory (called by |
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253 mail_index_move_to_memory()) */ |
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254 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log); |
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255 |
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256 #endif |