Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mail-transaction-log.h @ 9041:c8d63b42e9cc HEAD
Added mail_index_unlink().
author | Timo Sirainen <tss@iki.fi> |
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date | Sun, 17 May 2009 17:54:01 -0400 |
parents | a6779d086785 |
children | 9445831aebc0 |
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 |
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42 MAIL_TRANSACTION_TYPE_MASK = 0x0000ffff, |
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43 |
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44 #define MAIL_TRANSACTION_EXT_MASK \ |
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45 (MAIL_TRANSACTION_EXT_INTRO | MAIL_TRANSACTION_EXT_RESET | \ |
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46 MAIL_TRANSACTION_EXT_HDR_UPDATE | MAIL_TRANSACTION_EXT_REC_UPDATE) |
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47 |
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48 /* since we'll expunge mails based on data read from transaction log, |
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49 try to avoid the possibility of corrupted transaction log expunging |
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50 messages. this value is ORed to the actual MAIL_TRANSACTION_EXPUNGE |
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51 flag. if it's not present, assume corrupted log. */ |
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52 MAIL_TRANSACTION_EXPUNGE_PROT = 0x0000cd90, |
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53 |
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54 /* Mailbox synchronization noticed this change. */ |
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55 MAIL_TRANSACTION_EXTERNAL = 0x10000000 |
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56 }; |
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57 |
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58 struct mail_transaction_header { |
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59 uint32_t size; |
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60 uint32_t type; /* enum mail_transaction_type */ |
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61 }; |
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62 |
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63 struct mail_transaction_expunge { |
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64 uint32_t uid1, uid2; |
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65 }; |
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66 |
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67 struct mail_transaction_flag_update { |
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68 uint32_t uid1, uid2; |
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69 uint8_t add_flags; |
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70 uint8_t remove_flags; |
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71 uint16_t padding; |
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72 }; |
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73 |
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74 struct mail_transaction_keyword_update { |
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75 uint8_t modify_type; /* enum modify_type : MODIFY_ADD / MODIFY_REMOVE */ |
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76 uint8_t padding; |
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77 uint16_t name_size; |
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78 /* unsigned char name[]; |
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79 array of { uint32_t uid1, uid2; } |
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80 */ |
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81 }; |
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82 |
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83 struct mail_transaction_keyword_reset { |
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84 uint32_t uid1, uid2; |
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85 }; |
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86 |
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87 struct mail_transaction_header_update { |
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88 uint16_t offset; |
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89 uint16_t size; |
2410 | 90 /* unsigned char data[]; */ |
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91 }; |
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92 |
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93 enum { |
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94 /* Don't shrink hdr_size, record_size or record_align but grow them |
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95 if necessary. */ |
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96 MAIL_TRANSACTION_EXT_INTRO_FLAG_NO_SHRINK = 0x01 |
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97 }; |
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98 |
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99 struct mail_transaction_ext_intro { |
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100 /* old extension: set ext_id. don't set name. |
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101 new extension: ext_id = (uint32_t)-1. give name. */ |
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102 uint32_t ext_id; |
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103 uint32_t reset_id; |
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104 uint32_t hdr_size; |
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105 uint16_t record_size; |
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106 uint16_t record_align; |
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107 uint16_t flags; |
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108 uint16_t name_size; |
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109 /* unsigned char name[]; */ |
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110 }; |
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111 |
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112 struct mail_transaction_ext_reset { |
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113 uint32_t new_reset_id; |
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114 uint8_t preserve_data; |
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115 uint8_t unused_padding[3]; |
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116 }; |
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117 |
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118 /* these are set for the last ext_intro */ |
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119 struct mail_transaction_ext_hdr_update { |
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120 uint16_t offset; |
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121 uint16_t size; |
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122 /* unsigned char data[]; */ |
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123 }; |
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124 |
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125 struct mail_transaction_ext_rec_update { |
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126 uint32_t uid; |
2410 | 127 /* unsigned char data[]; */ |
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128 }; |
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129 |
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130 #define LOG_IS_BEFORE(seq1, offset1, seq2, offset2) \ |
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131 (((offset1) < (offset2) && (seq1) == (seq2)) || (seq1) < (seq2)) |
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132 |
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133 struct mail_transaction_log * |
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134 mail_transaction_log_alloc(struct mail_index *index); |
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135 void mail_transaction_log_free(struct mail_transaction_log **log); |
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136 |
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137 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's |
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138 is corrupted, -1 if there was some I/O error. */ |
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139 int mail_transaction_log_open(struct mail_transaction_log *log); |
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140 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */ |
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141 int mail_transaction_log_create(struct mail_transaction_log *log, bool reset); |
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142 /* Close all the open transactions log files. */ |
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143 void mail_transaction_log_close(struct mail_transaction_log *log); |
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144 |
5819 | 145 /* Notify of indexid change */ |
146 void mail_transaction_log_indexid_changed(struct mail_transaction_log *log); | |
147 | |
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148 /* Returns the file seq/offset where the mailbox is currently synced at. |
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149 Since the log is rotated only when mailbox is fully synced, the sequence |
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150 points always to the latest file. This function doesn't actually find the |
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151 latest sync position, so you'll need to use eg. log_view_set() before |
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152 calling this. */ |
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153 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log, |
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154 uint32_t *file_seq_r, |
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155 uoff_t *file_offset_r); |
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156 /* Set the current mailbox sync position. file_seq must always be the latest |
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157 log file's sequence. The offset written automatically to the log when |
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158 other transactions are being written. */ |
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159 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log, |
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160 uint32_t file_seq, |
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161 uoff_t file_offset); |
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162 |
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163 struct mail_transaction_log_view * |
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164 mail_transaction_log_view_open(struct mail_transaction_log *log); |
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165 void mail_transaction_log_view_close(struct mail_transaction_log_view **view); |
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166 |
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167 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok. |
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168 reset_r=TRUE if the whole index should be reset before applying any |
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169 changes. */ |
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170 int mail_transaction_log_view_set(struct mail_transaction_log_view *view, |
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171 uint32_t min_file_seq, uoff_t min_file_offset, |
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172 uint32_t max_file_seq, uoff_t max_file_offset, |
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173 bool *reset_r); |
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174 /* Clear the view. Keep oldest_file_seq and newer log files referenced so we |
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175 don't get desynced. */ |
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176 void mail_transaction_log_view_clear(struct mail_transaction_log_view *view, |
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177 uint32_t oldest_file_seq); |
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178 |
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179 /* Read next transaction record from current position. The position is updated. |
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180 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */ |
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181 int mail_transaction_log_view_next(struct mail_transaction_log_view *view, |
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182 const struct mail_transaction_header **hdr_r, |
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183 const void **data_r); |
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184 /* Mark the current view's position to the record returned previously with |
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185 _log_view_next(). */ |
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186 void mail_transaction_log_view_mark(struct mail_transaction_log_view *view); |
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187 /* Seek to previously marked position. */ |
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188 void mail_transaction_log_view_rewind(struct mail_transaction_log_view *view); |
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189 |
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190 /* Returns the position of the record returned previously with |
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191 mail_transaction_log_view_next() */ |
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192 void |
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193 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view, |
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194 uint32_t *file_seq_r, |
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195 uoff_t *file_offset_r); |
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196 /* Return the modseq of the change returned previously with _view_next(). */ |
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197 uint64_t |
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198 mail_transaction_log_view_get_prev_modseq(struct mail_transaction_log_view *view); |
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199 /* Returns TRUE if we're at the end of the view window. */ |
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200 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view); |
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201 |
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202 /* Marks the log file in current position to be corrupted. */ |
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203 void |
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204 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view, |
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205 const char *fmt, ...) |
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206 ATTR_FORMAT(2, 3); |
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207 bool |
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208 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view); |
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209 |
1942 | 210 void mail_transaction_log_views_close(struct mail_transaction_log *log); |
211 | |
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212 /* Write data to transaction log. This is atomic operation. Sequences in |
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213 updates[] and expunges[] are relative to given view, they're modified |
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214 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r |
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215 will be set to 0. */ |
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216 int mail_transaction_log_append(struct mail_index_transaction *t, |
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217 uint32_t *log_file_seq_r, |
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218 uoff_t *log_file_offset_r); |
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219 |
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220 /* Lock transaction log for index synchronization. Log cannot be read or |
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221 written to while it's locked. Returns end offset. */ |
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222 int mail_transaction_log_sync_lock(struct mail_transaction_log *log, |
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223 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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224 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log); |
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225 /* Returns the current head. Works only when log is locked. */ |
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226 void mail_transaction_log_get_head(struct mail_transaction_log *log, |
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227 uint32_t *file_seq_r, uoff_t *file_offset_r); |
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228 /* Returns TRUE if given seq/offset is current head log's rotate point. */ |
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229 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log, |
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230 uint32_t file_seq, uoff_t file_offset); |
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231 |
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232 /* Move currently opened log head file to memory (called by |
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233 mail_index_move_to_memory()) */ |
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234 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log); |
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235 |
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236 #endif |