Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-index/mail-transaction-log.h @ 8130:b97c3be33b04 HEAD

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Replaced "no extension resizing" flag with "no extension shrinking". It fixes some bugs while still handling the original reason it was added.
author Timo Sirainen <tss@iki.fi>
date Sun, 31 Aug 2008 10:22:10 +0300
parents 612eb505775f
children 0be9c476acdd
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 struct mail_index;
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5 struct mail_index_transaction;
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6
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7 #define MAIL_TRANSACTION_LOG_MAJOR_VERSION 1
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8 #define MAIL_TRANSACTION_LOG_MINOR_VERSION 2
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9 #define MAIL_TRANSACTION_LOG_HEADER_MIN_SIZE 24
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10
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11 struct mail_transaction_log_header {
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12 uint8_t major_version;
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13 uint8_t minor_version;
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14 uint16_t hdr_size;
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15
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16 uint32_t indexid;
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17 uint32_t file_seq;
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18 uint32_t prev_file_seq;
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19 uint32_t prev_file_offset;
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20 uint32_t create_stamp;
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21 uint64_t initial_modseq; /* v1.1+ */
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22
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23 uint8_t compat_flags; /* enum mail_index_header_compat_flags, v1.2+ */
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24 uint8_t unused[3];
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25 };
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26
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27 enum mail_transaction_type {
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28 MAIL_TRANSACTION_EXPUNGE = 0x00000001,
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29 MAIL_TRANSACTION_APPEND = 0x00000002,
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30 MAIL_TRANSACTION_FLAG_UPDATE = 0x00000004,
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31 MAIL_TRANSACTION_HEADER_UPDATE = 0x00000020,
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32 MAIL_TRANSACTION_EXT_INTRO = 0x00000040,
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33 MAIL_TRANSACTION_EXT_RESET = 0x00000080,
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34 MAIL_TRANSACTION_EXT_HDR_UPDATE = 0x00000100,
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35 MAIL_TRANSACTION_EXT_REC_UPDATE = 0x00000200,
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36 MAIL_TRANSACTION_KEYWORD_UPDATE = 0x00000400,
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37 MAIL_TRANSACTION_KEYWORD_RESET = 0x00000800,
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38
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39 MAIL_TRANSACTION_TYPE_MASK = 0x0000ffff,
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40
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41 #define MAIL_TRANSACTION_EXT_MASK \
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42 (MAIL_TRANSACTION_EXT_INTRO | MAIL_TRANSACTION_EXT_RESET | \
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43 MAIL_TRANSACTION_EXT_HDR_UPDATE | MAIL_TRANSACTION_EXT_REC_UPDATE)
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44
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45 /* since we'll expunge mails based on data read from transaction log,
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46 try to avoid the possibility of corrupted transaction log expunging
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47 messages. this value is ORed to the actual MAIL_TRANSACTION_EXPUNGE
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48 flag. if it's not present, assume corrupted log. */
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49 MAIL_TRANSACTION_EXPUNGE_PROT = 0x0000cd90,
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50
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51 /* Mailbox synchronization noticed this change. */
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52 MAIL_TRANSACTION_EXTERNAL = 0x10000000
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53 };
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54
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55 struct mail_transaction_header {
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56 uint32_t size;
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57 uint32_t type; /* enum mail_transaction_type */
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58 };
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59
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60 struct mail_transaction_expunge {
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61 uint32_t uid1, uid2;
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62 };
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63
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64 struct mail_transaction_flag_update {
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65 uint32_t uid1, uid2;
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66 uint8_t add_flags;
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67 uint8_t remove_flags;
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68 uint16_t padding;
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69 };
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70
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71 struct mail_transaction_keyword_update {
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72 uint8_t modify_type; /* enum modify_type : MODIFY_ADD / MODIFY_REMOVE */
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73 uint8_t padding;
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74 uint16_t name_size;
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75 /* unsigned char name[];
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76 array of { uint32_t uid1, uid2; }
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77 */
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78 };
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79
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80 struct mail_transaction_keyword_reset {
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81 uint32_t uid1, uid2;
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82 };
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83
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84 struct mail_transaction_header_update {
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85 uint16_t offset;
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86 uint16_t size;
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87 /* unsigned char data[]; */
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88 };
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89
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90 enum {
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91 /* Don't shrink hdr_size, record_size or record_align but grow them
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92 if necessary. */
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93 MAIL_TRANSACTION_EXT_INTRO_FLAG_NO_SHRINK = 0x01
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94 };
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95
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96 struct mail_transaction_ext_intro {
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97 /* old extension: set ext_id. don't set name.
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98 new extension: ext_id = (uint32_t)-1. give name. */
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99 uint32_t ext_id;
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100 uint32_t reset_id;
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101 uint32_t hdr_size;
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102 uint16_t record_size;
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103 uint16_t record_align;
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104 uint16_t flags;
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105 uint16_t name_size;
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106 /* unsigned char name[]; */
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107 };
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108
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109 struct mail_transaction_ext_reset {
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110 uint32_t new_reset_id;
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111 uint8_t preserve_data;
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112 uint8_t unused_padding[3];
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113 };
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114
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115 /* these are set for the last ext_intro */
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116 struct mail_transaction_ext_hdr_update {
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117 uint16_t offset;
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118 uint16_t size;
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119 /* unsigned char data[]; */
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120 };
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121
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122 struct mail_transaction_ext_rec_update {
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123 uint32_t uid;
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124 /* unsigned char data[]; */
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125 };
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126
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127 #define LOG_IS_BEFORE(seq1, offset1, seq2, offset2) \
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128 (((offset1) < (offset2) && (seq1) == (seq2)) || (seq1) < (seq2))
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129
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130 struct mail_transaction_log *
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131 mail_transaction_log_alloc(struct mail_index *index);
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132 void mail_transaction_log_free(struct mail_transaction_log **log);
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133
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134 /* Open the transaction log. Returns 1 if ok, 0 if file doesn't exist or it's
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135 is corrupted, -1 if there was some I/O error. */
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136 int mail_transaction_log_open(struct mail_transaction_log *log);
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137 /* Create, or recreate, the transaction log. Returns 0 if ok, -1 if error. */
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138 int mail_transaction_log_create(struct mail_transaction_log *log, bool reset);
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139 /* Close all the open transactions log files. */
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140 void mail_transaction_log_close(struct mail_transaction_log *log);
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141
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142 /* Notify of indexid change */
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143 void mail_transaction_log_indexid_changed(struct mail_transaction_log *log);
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144
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145 /* Returns the file seq/offset where the mailbox is currently synced at.
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146 Since the log is rotated only when mailbox is fully synced, the sequence
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147 points always to the latest file. This function doesn't actually find the
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148 latest sync position, so you'll need to use eg. log_view_set() before
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149 calling this. */
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150 void mail_transaction_log_get_mailbox_sync_pos(struct mail_transaction_log *log,
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151 uint32_t *file_seq_r,
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152 uoff_t *file_offset_r);
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153 /* Set the current mailbox sync position. file_seq must always be the latest
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154 log file's sequence. The offset written automatically to the log when
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155 other transactions are being written. */
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156 void mail_transaction_log_set_mailbox_sync_pos(struct mail_transaction_log *log,
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157 uint32_t file_seq,
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158 uoff_t file_offset);
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159
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160 struct mail_transaction_log_view *
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161 mail_transaction_log_view_open(struct mail_transaction_log *log);
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162 void mail_transaction_log_view_close(struct mail_transaction_log_view **view);
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163
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164 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok.
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165 reset_r=TRUE if the whole index should be reset before applying any
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166 changes. */
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167 int mail_transaction_log_view_set(struct mail_transaction_log_view *view,
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168 uint32_t min_file_seq, uoff_t min_file_offset,
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169 uint32_t max_file_seq, uoff_t max_file_offset,
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170 bool *reset_r);
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171 /* Clear the view. Keep oldest_file_seq log referenced so we don't get
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172 desynced. */
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173 void mail_transaction_log_view_clear(struct mail_transaction_log_view *view,
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174 uint32_t oldest_file_seq);
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175
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176 /* Read next transaction record from current position. The position is updated.
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177 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */
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178 int mail_transaction_log_view_next(struct mail_transaction_log_view *view,
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179 const struct mail_transaction_header **hdr_r,
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180 const void **data_r);
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181 /* Mark the current view's position to the record returned previously with
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182 _log_view_next(). */
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183 void mail_transaction_log_view_mark(struct mail_transaction_log_view *view);
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184 /* Seek to previously marked position. */
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185 void mail_transaction_log_view_rewind(struct mail_transaction_log_view *view);
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186
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187 /* Returns the position of the record returned previously with
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188 mail_transaction_log_view_next() */
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189 void
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190 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view,
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191 uint32_t *file_seq_r,
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192 uoff_t *file_offset_r);
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193 /* Return the modseq of the change returned previously with _view_next(). */
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194 uint64_t
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195 mail_transaction_log_view_get_prev_modseq(struct mail_transaction_log_view *view);
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196 /* Returns TRUE if we're at the end of the view window. */
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197 bool mail_transaction_log_view_is_last(struct mail_transaction_log_view *view);
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198
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199 /* Marks the log file in current position to be corrupted. */
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200 void
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201 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view,
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202 const char *fmt, ...)
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203 ATTR_FORMAT(2, 3);
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204 bool
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205 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view);
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206
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207 void mail_transaction_log_views_close(struct mail_transaction_log *log);
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208
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209 /* Write data to transaction log. This is atomic operation. Sequences in
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210 updates[] and expunges[] are relative to given view, they're modified
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211 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r
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212 will be set to 0. */
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213 int mail_transaction_log_append(struct mail_index_transaction *t,
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214 uint32_t *log_file_seq_r,
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215 uoff_t *log_file_offset_r);
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216
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217 /* Lock transaction log for index synchronization. Log cannot be read or
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218 written to while it's locked. Returns end offset. */
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219 int mail_transaction_log_sync_lock(struct mail_transaction_log *log,
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220 uint32_t *file_seq_r, uoff_t *file_offset_r);
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221 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log);
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222 /* Returns the current head. Works only when log is locked. */
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223 void mail_transaction_log_get_head(struct mail_transaction_log *log,
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224 uint32_t *file_seq_r, uoff_t *file_offset_r);
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225 /* Returns TRUE if given seq/offset is current head log's rotate point. */
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226 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log,
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227 uint32_t file_seq, uoff_t file_offset);
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228
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229 /* Move currently opened log head file to memory (called by
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230 mail_index_move_to_memory()) */
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231 void mail_transaction_log_move_to_memory(struct mail_transaction_log *log);
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232
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233 #endif