Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-index/mail-transaction-log.h @ 5278:d569caa88a66 HEAD

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
If we run out of disk space, move to in-memory indexes.
author Timo Sirainen <tss@iki.fi>
date Sun, 11 Mar 2007 18:10:41 +0200
parents c1ef15c1a1fa
children 1273ce0585b3
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_open_or_create(struct mail_index *index);
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110 struct mail_transaction_log *
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111 mail_transaction_log_create(struct mail_index *index);
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112 void mail_transaction_log_close(struct mail_transaction_log **log);
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113
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114 int mail_transaction_log_move_to_memory(struct mail_transaction_log *log);
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115
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116 struct mail_transaction_log_view *
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117 mail_transaction_log_view_open(struct mail_transaction_log *log);
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118 void mail_transaction_log_view_close(struct mail_transaction_log_view **view);
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119
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120 /* Set view boundaries. Returns -1 if error, 0 if files are lost, 1 if ok. */
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121 int
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122 mail_transaction_log_view_set(struct mail_transaction_log_view *view,
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123 uint32_t min_file_seq, uoff_t min_file_offset,
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124 uint32_t max_file_seq, uoff_t max_file_offset,
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125 enum mail_transaction_type type_mask);
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126
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127 /* Read next transaction record from current position. The position is updated.
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128 Returns -1 if error, 0 if we're at end of the view, 1 if ok. */
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129 int mail_transaction_log_view_next(struct mail_transaction_log_view *view,
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130 const struct mail_transaction_header **hdr_r,
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131 const void **data_r, bool *skipped_r);
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132 /* Seek to given position within view. Must be inside the view's range. */
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133 void mail_transaction_log_view_seek(struct mail_transaction_log_view *view,
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134 uint32_t seq, uoff_t offset);
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135
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136 /* Returns the position of the record returned previously with
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137 mail_transaction_log_view_next() */
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138 void
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139 mail_transaction_log_view_get_prev_pos(struct mail_transaction_log_view *view,
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140 uint32_t *file_seq_r,
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141 uoff_t *file_offset_r);
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142
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143 /* Marks the log file in current position to be corrupted. */
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144 void
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145 mail_transaction_log_view_set_corrupted(struct mail_transaction_log_view *view,
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146 const char *fmt, ...)
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147 __attr_format__(2, 3);
3863
55df57c028d4 Added "bool" type and changed all ints that were used as booleans to bool.
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148 bool
1915
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149 mail_transaction_log_view_is_corrupted(struct mail_transaction_log_view *view);
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150
1942
2b114aa7eeec handle losing index file
Timo Sirainen <tss@iki.fi>
parents: 1941
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151 void mail_transaction_log_views_close(struct mail_transaction_log *log);
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parents: 1941
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152
1915
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153 /* Write data to transaction log. This is atomic operation. Sequences in
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154 updates[] and expunges[] are relative to given view, they're modified
2009
2e77ee652e2e When committing with no changes, don't try to sync them later.
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parents: 1976
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155 to real ones. If nothing is written, log_file_seq_r and log_file_offset_r
2e77ee652e2e When committing with no changes, don't try to sync them later.
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parents: 1976
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156 will be set to 0. */
1915
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157 int mail_transaction_log_append(struct mail_index_transaction *t,
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158 uint32_t *log_file_seq_r,
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159 uoff_t *log_file_offset_r);
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160
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161 /* Lock transaction log for index synchronization. Log cannot be read or
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162 written to while it's locked. Returns end offset. */
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163 int mail_transaction_log_sync_lock(struct mail_transaction_log *log,
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164 uint32_t *file_seq_r, uoff_t *file_offset_r);
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165 void mail_transaction_log_sync_unlock(struct mail_transaction_log *log);
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166 /* Returns the current head. Works only when log is locked. */
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167 void mail_transaction_log_get_head(struct mail_transaction_log *log,
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168 uint32_t *file_seq_r, uoff_t *file_offset_r);
3832
76f4be7ae499 Handle missing/broken transaction logs better. Handle broken sync position
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parents: 3180
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169 /* Returns TRUE if given seq/offset is current head log's rotate point. */
3863
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Timo Sirainen <tss@iki.fi>
parents: 3833
diff changeset
170 bool mail_transaction_log_is_head_prev(struct mail_transaction_log *log,
55df57c028d4 Added "bool" type and changed all ints that were used as booleans to bool.
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parents: 3833
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171 uint32_t file_seq, uoff_t file_offset);
1915
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parents:
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172
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173 #endif