Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-storage/index/cydir/cydir-sync.c @ 5458:daca7ed634c0 HEAD

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Added a simple cydir mail storage backend. It trusts index files completely: if the indexes are gone, the mailbox starts completely empty and overwriting the existing mail files. So probably not a good idea to use this in production yet.
author Timo Sirainen <tss@iki.fi>
date Fri, 30 Mar 2007 15:08:59 +0300
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children 78eaf595359c
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5458
daca7ed634c0 Added a simple cydir mail storage backend. It trusts index files completely:
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1 /* Copyright (C) 2007 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "ioloop.h"
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5 #include "str.h"
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6 #include "cydir-storage.h"
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7 #include "cydir-sync.h"
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8
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9 static int cydir_sync_set_uidvalidity(struct cydir_sync_context *ctx)
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10 {
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11 struct mail_index_transaction *trans;
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12 uint32_t uid_validity = ioloop_time;
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13 uint32_t seq;
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14 uoff_t offset;
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15
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16 trans = mail_index_transaction_begin(ctx->sync_view, FALSE, TRUE);
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17 mail_index_update_header(trans,
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18 offsetof(struct mail_index_header, uid_validity),
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19 &uid_validity, sizeof(uid_validity), TRUE);
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20
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21 if (mail_index_transaction_commit(&trans, &seq, &offset) < 0) {
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22 mail_storage_set_index_error(&ctx->mbox->ibox);
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23 return -1;
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24 }
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25 return 0;
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26 }
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27
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28 static string_t *cydir_get_path_prefix(struct cydir_mailbox *mbox)
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29 {
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30 string_t *path = t_str_new(256);
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31 const char *dir;
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32
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33 dir = mailbox_list_get_path(STORAGE(mbox->storage)->list,
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34 mbox->ibox.box.name,
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35 MAILBOX_LIST_PATH_TYPE_MAILBOX);
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36 str_append(path, dir);
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37 str_append_c(path, '/');
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38 return path;
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39 }
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40
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41 static int cydir_sync_index(struct cydir_sync_context *ctx)
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42 {
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43 const struct mail_index_header *hdr;
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44 struct mail_index_sync_rec sync_rec;
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45 string_t *path = NULL;
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46 unsigned int prefix_len = 0;
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47 uint32_t seq1, seq2, uid;
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48 int ret;
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49
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50 hdr = mail_index_get_header(ctx->sync_view);
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51 if (hdr->uid_validity == 0) {
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52 if (cydir_sync_set_uidvalidity(ctx) < 0)
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53 return -1;
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54 }
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55
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56 /* unlink expunged messages */
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57 while ((ret = mail_index_sync_next(ctx->index_sync_ctx,
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58 &sync_rec)) > 0) {
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59 if (sync_rec.type != MAIL_INDEX_SYNC_TYPE_EXPUNGE)
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60 continue;
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61
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62 if (mail_index_lookup_uid_range(ctx->sync_view,
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63 sync_rec.uid1, sync_rec.uid2,
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64 &seq1, &seq2) < 0) {
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65 mail_storage_set_index_error(&ctx->mbox->ibox);
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66 return -1;
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67 }
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68 if (seq1 == 0) {
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69 /* already expunged everything. nothing to do. */
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70 continue;
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71 }
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72
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73 if (path == NULL) {
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74 path = cydir_get_path_prefix(ctx->mbox);
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75 prefix_len = str_len(path);
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76 }
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77
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78 for (; seq1 <= seq2; seq1++) {
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79 if (mail_index_lookup_uid(ctx->sync_view, seq1,
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80 &uid) < 0) {
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81 mail_storage_set_index_error(&ctx->mbox->ibox);
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82 return -1;
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83 }
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84
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85 str_truncate(path, prefix_len);
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86 str_printfa(path, "%u.", uid);
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87 if (unlink(str_c(path)) < 0 && errno != ENOENT) {
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88 mail_storage_set_critical(
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89 STORAGE(ctx->mbox->storage),
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90 "unlink(%s) failed: %m", str_c(path));
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91 /* continue anyway */
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92 }
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93 }
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94 }
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95 return 0;
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96 }
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97
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98 int cydir_sync_begin(struct cydir_mailbox *mbox,
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99 struct cydir_sync_context **ctx_r)
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100 {
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101 struct cydir_sync_context *ctx;
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102 int ret;
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103
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104 ctx = i_new(struct cydir_sync_context, 1);
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105 ctx->mbox = mbox;
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106 ret = mail_index_sync_begin(mbox->ibox.index, &ctx->index_sync_ctx,
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107 &ctx->sync_view, (uint32_t)-1, (uoff_t)-1,
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108 !mbox->ibox.keep_recent, TRUE);
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109 if (ret <= 0) {
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110 if (ret < 0)
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111 mail_storage_set_index_error(&mbox->ibox);
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112 i_free(ctx);
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113 return ret;
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114 }
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115
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116 if (cydir_sync_index(ctx) < 0) {
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117 mail_index_sync_rollback(&ctx->index_sync_ctx);
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118 i_free(ctx);
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119 return -1;
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120 }
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121
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122 *ctx_r = ctx;
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123 return 0;
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124 }
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125
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126 int cydir_sync_finish(struct cydir_sync_context **_ctx, bool success)
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127 {
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128 struct cydir_sync_context *ctx = *_ctx;
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129 int ret = success ? 0 : -1;
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130
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131 *_ctx = NULL;
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132 if (success) {
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133 if (mail_index_sync_commit(&ctx->index_sync_ctx) < 0) {
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134 mail_storage_set_index_error(&ctx->mbox->ibox);
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135 ret = -1;
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136 }
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137 } else {
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138 mail_index_sync_rollback(&ctx->index_sync_ctx);
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139 }
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140 i_free(ctx);
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141 return 0;
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142 }
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143
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144 int cydir_sync(struct cydir_mailbox *mbox)
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145 {
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146 struct cydir_sync_context *sync_ctx;
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147
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148 if (cydir_sync_begin(mbox, &sync_ctx) < 0)
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149 return -1;
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150
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151 return cydir_sync_finish(&sync_ctx, TRUE);
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152 }
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153
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154 struct mailbox_sync_context *
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155 cydir_storage_sync_init(struct mailbox *box, enum mailbox_sync_flags flags)
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156 {
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157 struct cydir_mailbox *mbox = (struct cydir_mailbox *)box;
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158 int ret = 0;
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159
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160 if (!box->opened)
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161 index_storage_mailbox_open(&mbox->ibox);
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162
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163 if ((flags & MAILBOX_SYNC_FLAG_FAST) == 0 ||
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164 mbox->ibox.sync_last_check + MAILBOX_FULL_SYNC_INTERVAL <=
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165 ioloop_time)
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166 ret = cydir_sync(mbox);
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167
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168 return index_mailbox_sync_init(box, flags, ret < 0);
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169 }