Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mail-transaction-log.h @ 7563:6de1aed24ce5 HEAD
Added mail_index_ext_reset_inc() to atomically increase extension's
reset_id. Added clear_data parameter to mail_index_ext_reset*().
author | Timo Sirainen <tss@iki.fi> |
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date | Thu, 29 May 2008 04:47:53 +0300 |
parents | cca479cb3ef0 |
children | de08cc81da73 |
rev | line source |
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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 #define MAIL_TRANSACTION_LOG_MAJOR_VERSION 1 |
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5 #define MAIL_TRANSACTION_LOG_MINOR_VERSION 0 |
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6 #define MAIL_TRANSACTION_LOG_HEADER_MIN_SIZE 24 |
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7 |
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8 struct mail_transaction_log_header { |
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9 uint8_t major_version; |
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10 uint8_t minor_version; |
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11 uint16_t hdr_size; |
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12 |
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13 uint32_t indexid; |
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14 uint32_t file_seq; |
1940 | 15 uint32_t prev_file_seq; |
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16 uint32_t prev_file_offset; |
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17 uint32_t create_stamp; |
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18 }; |
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19 |
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20 enum mail_transaction_type { |
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21 MAIL_TRANSACTION_EXPUNGE = 0x00000001, |
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22 MAIL_TRANSACTION_APPEND = 0x00000002, |
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23 MAIL_TRANSACTION_FLAG_UPDATE = 0x00000004, |
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24 MAIL_TRANSACTION_HEADER_UPDATE = 0x00000020, |
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25 MAIL_TRANSACTION_EXT_INTRO = 0x00000040, |
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26 MAIL_TRANSACTION_EXT_RESET = 0x00000080, |
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27 MAIL_TRANSACTION_EXT_HDR_UPDATE = 0x00000100, |
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28 MAIL_TRANSACTION_EXT_REC_UPDATE = 0x00000200, |
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29 MAIL_TRANSACTION_KEYWORD_UPDATE = 0x00000400, |
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30 MAIL_TRANSACTION_KEYWORD_RESET = 0x00000800, |
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31 |
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32 MAIL_TRANSACTION_TYPE_MASK = 0x0000ffff, |
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33 |
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34 #define MAIL_TRANSACTION_EXT_MASK \ |
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35 (MAIL_TRANSACTION_EXT_INTRO | MAIL_TRANSACTION_EXT_RESET | \ |
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36 MAIL_TRANSACTION_EXT_HDR_UPDATE | MAIL_TRANSACTION_EXT_REC_UPDATE) |
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37 |
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38 /* since we'll expunge mails based on data read from transaction log, |
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39 try to avoid the possibility of corrupted transaction log expunging |
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40 messages. this value is ORed to the actual MAIL_TRANSACTION_EXPUNGE |
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41 flag. if it's not present, assume corrupted log. */ |
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42 MAIL_TRANSACTION_EXPUNGE_PROT = 0x0000cd90, |
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43 |
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44 /* Mailbox synchronization noticed this change. */ |
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45 MAIL_TRANSACTION_EXTERNAL = 0x10000000 |
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46 }; |
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47 |
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48 struct mail_transaction_header { |
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49 uint32_t size; |
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50 uint32_t type; /* enum mail_transaction_type */ |
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51 }; |
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52 |
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53 struct mail_transaction_expunge { |
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54 uint32_t uid1, uid2; |
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55 }; |
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56 |
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57 struct mail_transaction_flag_update { |
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58 uint32_t uid1, uid2; |
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59 uint8_t add_flags; |
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60 uint8_t remove_flags; |
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61 uint16_t padding; |
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62 }; |
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63 |
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64 struct mail_transaction_keyword_update { |
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65 uint8_t modify_type; /* enum modify_type : MODIFY_ADD / MODIFY_REMOVE */ |
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66 uint8_t padding; |
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67 uint16_t name_size; |
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68 /* unsigned char name[]; |
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69 array of { uint32_t uid1, uid2; } |
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70 */ |
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71 }; |
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72 |
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73 struct mail_transaction_keyword_reset { |
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74 uint32_t uid1, uid2; |
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75 }; |
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76 |
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77 struct mail_transaction_header_update { |
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78 uint16_t offset; |
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79 uint16_t size; |
2410 | 80 /* unsigned char data[]; */ |
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81 }; |
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82 |
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83 struct mail_transaction_ext_intro { |
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84 /* old extension: set ext_id. don't set name. |
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85 new extension: ext_id = (uint32_t)-1. give name. */ |
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86 uint32_t ext_id; |
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87 uint32_t reset_id; |
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88 uint32_t hdr_size; |
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89 uint16_t record_size; |
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90 uint16_t record_align; |
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91 uint16_t unused_padding; |
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92 uint16_t name_size; |
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93 /* unsigned char name[]; */ |
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94 }; |
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95 |
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96 struct mail_transaction_ext_reset { |
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97 uint32_t new_reset_id; |
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98 uint8_t preserve_data; |
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99 uint8_t unused_padding[3]; |
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100 }; |
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101 |
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102 /* these are set for the last ext_intro */ |
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103 struct mail_transaction_ext_hdr_update { |
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104 uint16_t offset; |
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105 uint16_t size; |
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106 /* unsigned char data[]; */ |
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107 }; |
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108 |
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109 struct mail_transaction_ext_rec_update { |
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110 uint32_t uid; |
2410 | 111 /* unsigned char data[]; */ |
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112 }; |
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113 |
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114 #define LOG_IS_BEFORE(seq1, offset1, seq2, offset2) \ |
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115 (((offset1) < (offset2) && (seq1) == (seq2)) || (seq1) < (seq2)) |
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116 |
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117 struct mail_transaction_log * |
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118 mail_transaction_log_alloc(struct mail_index *index); |
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119 void mail_transaction_log_free(struct mail_transaction_log **log); |
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120 |
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121 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's |
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122 is corrupted, -1 if there was some I/O error. */ |
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123 int mail_transaction_log_open(struct mail_transaction_log *log); |
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124 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */ |
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125 int mail_transaction_log_create(struct mail_transaction_log *log); |
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126 /* Close all the open transactions log files. */ |
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127 void mail_transaction_log_close(struct mail_transaction_log *log); |
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128 |
5819 | 129 /* Notify of indexid change */ |
130 void mail_transaction_log_indexid_changed(struct mail_transaction_log *log); | |
131 | |
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132 /* Returns the file seq/offset where the mailbox is currently synced at. |
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133 Since the log is rotated only when mailbox is fully synced, the sequence |
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134 points always to the latest file. This function doesn't actually find the |
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135 latest sync position, so you'll need to use eg. log_view_set() before |
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136 calling this. */ |
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137 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log, |
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138 uint32_t *file_seq_r, |
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139 uoff_t *file_offset_r); |
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140 /* Set the current mailbox sync position. file_seq must always be the latest |
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141 log file's sequence. The offset written automatically to the log when |
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142 other transactions are being written. */ |
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143 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log, |
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144 uint32_t file_seq, |
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145 uoff_t file_offset); |
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146 |
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147 struct mail_transaction_log_view * |
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148 mail_transaction_log_view_open(struct mail_transaction_log *log); |
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149 void mail_transaction_log_view_close(struct mail_transaction_log_view **view); |
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150 |
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151 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok. |
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152 reset_r=TRUE if the whole index should be reset before applying any |
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153 changes. */ |
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154 int mail_transaction_log_view_set(struct mail_transaction_log_view *view, |
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155 uint32_t min_file_seq, uoff_t min_file_offset, |
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156 uint32_t max_file_seq, uoff_t max_file_offset, |
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157 bool *reset_r); |
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158 /* Clear the view. Keep oldest_file_seq log referenced so we don't get |
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159 desynced. */ |
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160 void mail_transaction_log_view_clear(struct mail_transaction_log_view *view, |
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161 uint32_t oldest_file_seq); |
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162 |
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163 /* Read next transaction record from current position. The position is updated. |
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164 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */ |
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165 int mail_transaction_log_view_next(struct mail_transaction_log_view *view, |
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166 const struct mail_transaction_header **hdr_r, |
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167 const void **data_r); |
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168 /* Seek to given position within view. Must be inside the view's range. */ |
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169 void mail_transaction_log_view_seek(struct mail_transaction_log_view *view, |
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170 uint32_t seq, uoff_t offset); |
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171 |
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172 /* Returns the position of the record returned previously with |
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173 mail_transaction_log_view_next() */ |
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174 void |
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175 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view, |
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176 uint32_t *file_seq_r, |
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177 uoff_t *file_offset_r); |
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178 /* Returns TRUE if we're at the end of the view window. */ |
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179 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view); |
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180 |
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181 /* Marks the log file in current position to be corrupted. */ |
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182 void |
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183 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view, |
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184 const char *fmt, ...) |
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185 ATTR_FORMAT(2, 3); |
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186 bool |
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187 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view); |
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188 |
1942 | 189 void mail_transaction_log_views_close(struct mail_transaction_log *log); |
190 | |
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191 /* Write data to transaction log. This is atomic operation. Sequences in |
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192 updates[] and expunges[] are relative to given view, they're modified |
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193 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r |
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194 will be set to 0. */ |
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195 int mail_transaction_log_append(struct mail_index_transaction *t, |
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196 uint32_t *log_file_seq_r, |
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197 uoff_t *log_file_offset_r); |
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198 |
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199 /* Lock transaction log for index synchronization. Log cannot be read or |
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200 written to while it's locked. Returns end offset. */ |
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201 int mail_transaction_log_sync_lock(struct mail_transaction_log *log, |
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202 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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203 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log); |
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204 /* Returns the current head. Works only when log is locked. */ |
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205 void mail_transaction_log_get_head(struct mail_transaction_log *log, |
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206 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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207 /* Returns TRUE if given seq/offset is current head log's rotate point. */ |
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208 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log, |
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209 uint32_t file_seq, uoff_t file_offset); |
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210 |
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211 /* Move currently opened log head file to memory (called by |
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212 mail_index_move_to_memory()) */ |
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213 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log); |
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214 |
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215 #endif |