Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-index/mail-transaction-log.h @ 5728:7aab5d99fb45 HEAD

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Removed sync_mask parameter from mail_transaction_log_view_set(). The user will now have to check the types itself.
author Timo Sirainen <tss@iki.fi>
date Wed, 13 Jun 2007 23:00:58 +0300
parents dcf5dbb6a76a
children c71f611bbffc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 /* since we'll expunge mails based on data read from transaction log,
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35 try to avoid the possibility of corrupted transaction log expunging
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36 messages. this value is ORed to the actual MAIL_TRANSACTION_EXPUNGE
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37 flag. if it's not present, assume corrupted log. */
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38 MAIL_TRANSACTION_EXPUNGE_PROT = 0x0000cd90,
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39
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40 /* Mailbox synchronization noticed this change. */
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41 MAIL_TRANSACTION_EXTERNAL = 0x10000000
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42 };
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43
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44 struct mail_transaction_header {
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45 uint32_t size;
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46 uint32_t type; /* enum mail_transaction_type */
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47 };
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48
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49 struct mail_transaction_expunge {
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50 uint32_t uid1, uid2;
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51 };
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52
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53 struct mail_transaction_flag_update {
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54 uint32_t uid1, uid2;
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55 uint8_t add_flags;
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56 uint8_t remove_flags;
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57 uint16_t padding;
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58 };
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59
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60 struct mail_transaction_keyword_update {
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61 uint8_t modify_type; /* enum modify_type : MODIFY_ADD / MODIFY_REMOVE */
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62 uint8_t padding;
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63 uint16_t name_size;
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64 /* unsigned char name[];
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65 array of { uint32_t uid1, uid2; }
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66 */
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67 };
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68
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69 struct mail_transaction_keyword_reset {
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70 uint32_t uid1, uid2;
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71 };
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72
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73 struct mail_transaction_header_update {
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74 uint16_t offset;
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75 uint16_t size;
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76 /* unsigned char data[]; */
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77 };
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78
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79 struct mail_transaction_ext_intro {
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80 /* old extension: set ext_id. don't set name.
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81 new extension: ext_id = (uint32_t)-1. give name. */
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82 uint32_t ext_id;
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83 uint32_t reset_id;
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84 uint32_t hdr_size;
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85 uint16_t record_size;
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86 uint16_t record_align;
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87 uint16_t unused_padding;
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88 uint16_t name_size;
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89 /* unsigned char name[]; */
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90 };
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91
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92 struct mail_transaction_ext_reset {
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93 uint32_t new_reset_id;
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94 };
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95
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96 /* these are set for the last ext_intro */
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97 struct mail_transaction_ext_hdr_update {
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98 uint16_t offset;
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99 uint16_t size;
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100 /* unsigned char data[]; */
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101 };
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102
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103 struct mail_transaction_ext_rec_update {
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104 uint32_t uid;
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105 /* unsigned char data[]; */
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106 };
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107
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108 struct mail_transaction_log *
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109 mail_transaction_log_alloc(struct mail_index *index);
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110 void mail_transaction_log_free(struct mail_transaction_log **log);
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111
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112 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's
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113 is corrupted, -1 if there was some I/O error. */
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114 int mail_transaction_log_open(struct mail_transaction_log *log);
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115 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */
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116 int mail_transaction_log_create(struct mail_transaction_log *log);
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117 /* Close all the open transactions log files. */
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118 void mail_transaction_log_close(struct mail_transaction_log *log);
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119
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120 /* Returns the file seq/offset where the mailbox is currently synced at.
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121 Since the log is rotated only when mailbox is fully synced, the sequence
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122 points always to the latest file. This function doesn't actually find the
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123 latest sync position, so you'll need to use eg. log_view_set() before
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124 calling this. */
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125 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log,
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126 uint32_t *file_seq_r,
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127 uoff_t *file_offset_r);
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128 /* Set the current mailbox sync position. file_seq must always be the latest
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129 log file's sequence. The offset written automatically to the log when
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130 other transactions are being written. */
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131 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log,
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132 uint32_t file_seq,
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133 uoff_t file_offset);
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134
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135 struct mail_transaction_log_view *
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136 mail_transaction_log_view_open(struct mail_transaction_log *log);
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137 void mail_transaction_log_view_close(struct mail_transaction_log_view **view);
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138
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139 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok. */
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140 int
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141 mail_transaction_log_view_set(struct mail_transaction_log_view *view,
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142 uint32_t min_file_seq, uoff_t min_file_offset,
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143 uint32_t max_file_seq, uoff_t max_file_offset);
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144
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145 /* Read next transaction record from current position. The position is updated.
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146 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */
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147 int mail_transaction_log_view_next(struct mail_transaction_log_view *view,
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148 const struct mail_transaction_header **hdr_r,
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149 const void **data_r);
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150 /* Seek to given position within view. Must be inside the view's range. */
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151 void mail_transaction_log_view_seek(struct mail_transaction_log_view *view,
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152 uint32_t seq, uoff_t offset);
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153
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154 /* Returns the position of the record returned previously with
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155 mail_transaction_log_view_next() */
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156 void
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157 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view,
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158 uint32_t *file_seq_r,
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159 uoff_t *file_offset_r);
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160 /* Returns TRUE if we're at the end of the view window. */
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161 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view);
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162
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163 /* Marks the log file in current position to be corrupted. */
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164 void
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165 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view,
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166 const char *fmt, ...)
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167 __attr_format__(2, 3);
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168 bool
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169 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view);
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170
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171 void mail_transaction_log_views_close(struct mail_transaction_log *log);
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172
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173 /* Write data to transaction log. This is atomic operation. Sequences in
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174 updates[] and expunges[] are relative to given view, they're modified
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175 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r
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176 will be set to 0. */
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177 int mail_transaction_log_append(struct mail_index_transaction *t,
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178 uint32_t *log_file_seq_r,
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179 uoff_t *log_file_offset_r);
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180
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181 /* Lock transaction log for index synchronization. Log cannot be read or
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182 written to while it's locked. Returns end offset. */
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183 int mail_transaction_log_sync_lock(struct mail_transaction_log *log,
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184 uint32_t *file_seq_r, uoff_t *file_offset_r);
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185 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log);
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186 /* Returns the current head. Works only when log is locked. */
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187 void mail_transaction_log_get_head(struct mail_transaction_log *log,
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188 uint32_t *file_seq_r, uoff_t *file_offset_r);
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189 /* Returns TRUE if given seq/offset is current head log's rotate point. */
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190 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log,
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191 uint32_t file_seq, uoff_t file_offset);
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192
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193 /* Move currently opened log head file to memory (called by
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194 mail_index_move_to_memory()) */
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195 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log);
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196
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197 #endif