Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-index/mail-transaction-log.h @ 6410:e4eb71ae8e96 HEAD

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Changed .h ifdef/defines to use <NAME>_H format.
author Timo Sirainen <tss@iki.fi>
date Sun, 16 Sep 2007 11:31:27 +0300
parents a9df50952600
children 6a64e64fa3a3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6410
e4eb71ae8e96 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 #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;
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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;
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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 };
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99
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100 /* these are set for the last ext_intro */
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101 struct mail_transaction_ext_hdr_update {
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102 uint16_t offset;
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103 uint16_t size;
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104 /* unsigned char data[]; */
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105 };
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106
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107 struct mail_transaction_ext_rec_update {
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108 uint32_t uid;
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109 /* unsigned char data[]; */
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110 };
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111
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112 #define LOG_IS_BEFORE(seq1, offset1, seq2, offset2) \
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113 (((offset1) < (offset2) && (seq1) == (seq2)) || (seq1) < (seq2))
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114
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115 struct mail_transaction_log *
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116 mail_transaction_log_alloc(struct mail_index *index);
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117 void mail_transaction_log_free(struct mail_transaction_log **log);
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118
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119 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's
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120 is corrupted, -1 if there was some I/O error. */
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121 int mail_transaction_log_open(struct mail_transaction_log *log);
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122 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */
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123 int mail_transaction_log_create(struct mail_transaction_log *log);
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124 /* Close all the open transactions log files. */
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125 void mail_transaction_log_close(struct mail_transaction_log *log);
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126
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127 /* Notify of indexid change */
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128 void mail_transaction_log_indexid_changed(struct mail_transaction_log *log);
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129
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130 /* Returns the file seq/offset where the mailbox is currently synced at.
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131 Since the log is rotated only when mailbox is fully synced, the sequence
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132 points always to the latest file. This function doesn't actually find the
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133 latest sync position, so you'll need to use eg. log_view_set() before
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134 calling this. */
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135 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log,
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136 uint32_t *file_seq_r,
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137 uoff_t *file_offset_r);
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138 /* Set the current mailbox sync position. file_seq must always be the latest
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139 log file's sequence. The offset written automatically to the log when
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140 other transactions are being written. */
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141 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log,
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142 uint32_t file_seq,
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143 uoff_t file_offset);
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144
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145 struct mail_transaction_log_view *
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146 mail_transaction_log_view_open(struct mail_transaction_log *log);
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147 void mail_transaction_log_view_close(struct mail_transaction_log_view **view);
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148
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149 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok.
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150 reset_r=TRUE if the whole index should be reset before applying any
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151 changes. */
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152 int mail_transaction_log_view_set(struct mail_transaction_log_view *view,
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153 uint32_t min_file_seq, uoff_t min_file_offset,
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154 uint32_t max_file_seq, uoff_t max_file_offset,
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155 bool *reset_r);
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156 /* Clear the view. */
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157 void mail_transaction_log_view_clear(struct mail_transaction_log_view *view);
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158
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159 /* Read next transaction record from current position. The position is updated.
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160 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */
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161 int mail_transaction_log_view_next(struct mail_transaction_log_view *view,
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162 const struct mail_transaction_header **hdr_r,
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163 const void **data_r);
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164 /* Seek to given position within view. Must be inside the view's range. */
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165 void mail_transaction_log_view_seek(struct mail_transaction_log_view *view,
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166 uint32_t seq, uoff_t offset);
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167
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168 /* Returns the position of the record returned previously with
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169 mail_transaction_log_view_next() */
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170 void
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171 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view,
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172 uint32_t *file_seq_r,
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173 uoff_t *file_offset_r);
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174 /* Returns TRUE if we're at the end of the view window. */
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175 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view);
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176
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177 /* Marks the log file in current position to be corrupted. */
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178 void
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179 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view,
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180 const char *fmt, ...)
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181 __attr_format__(2, 3);
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182 bool
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183 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view);
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184
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185 void mail_transaction_log_views_close(struct mail_transaction_log *log);
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186
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187 /* Write data to transaction log. This is atomic operation. Sequences in
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188 updates[] and expunges[] are relative to given view, they're modified
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189 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r
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190 will be set to 0. */
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191 int mail_transaction_log_append(struct mail_index_transaction *t,
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192 uint32_t *log_file_seq_r,
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193 uoff_t *log_file_offset_r);
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194
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195 /* Lock transaction log for index synchronization. Log cannot be read or
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196 written to while it's locked. Returns end offset. */
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197 int mail_transaction_log_sync_lock(struct mail_transaction_log *log,
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198 uint32_t *file_seq_r, uoff_t *file_offset_r);
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199 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log);
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200 /* Returns the current head. Works only when log is locked. */
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201 void mail_transaction_log_get_head(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 /* Returns TRUE if given seq/offset is current head log's rotate point. */
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204 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log,
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205 uint32_t file_seq, uoff_t file_offset);
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206
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207 /* Move currently opened log head file to memory (called by
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208 mail_index_move_to_memory()) */
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209 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log);
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210
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211 #endif