Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/plugins/trash/trash-plugin.c @ 3738:732b62dc1976 HEAD

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Added beginnings of plugin infrastructure. TODO: These could be optionally compiled into binaries with some configure options. Added quota plugin and a new trash plugin. Not very well tested.
author Timo Sirainen <tss@iki.fi>
date Sat, 10 Dec 2005 21:44:45 +0200
parents
children 55df57c028d4
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rev   line source
3738
732b62dc1976 Added beginnings of plugin infrastructure. TODO: These could be optionally
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1 /* Copyright (C) 2005 Timo Sirainen */
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2
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3 #include "lib.h"
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4 #include "array.h"
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5 #include "istream.h"
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6 #include "home-expand.h"
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7 #include "mail-search.h"
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8 #include "quota-private.h"
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9 #include "quota-plugin.h"
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10 #include "trash-plugin.h"
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11
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12 #include <stdlib.h>
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13 #include <unistd.h>
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14 #include <fcntl.h>
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15
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16 #define LOCAL_CONFIG_FILE "~/.dovecot.trash.conf"
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17 #define GLOBAL_CONFIG_FILE "/etc/dovecot-trash.conf"
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18
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19 #define MAX_RETRY_COUNT 3
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20
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21 #define TRASH_CONTEXT(obj) \
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22 *((void **)array_idx_modifyable(&(obj)->quota_module_contexts, \
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23 trash_quota_module_id))
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24
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25 struct trash_quota {
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26 struct quota super;
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27 };
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28
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29 struct trash_mailbox {
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30 const char *name;
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31 int priority; /* lower number = higher priority */
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32
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33 struct mail_storage *storage;
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34
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35 /* temporarily set while cleaning: */
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36 struct mailbox *box;
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37 struct mailbox_transaction_context *trans;
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38 struct mail_search_context *search_ctx;
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39 struct mail *mail;
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40
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41 unsigned int mail_set:1;
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42 };
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43
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44 /* defined by imap, pop3, lda */
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45 extern void (*hook_mail_storage_created)(struct mail_storage *storage);
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46
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47 static void (*trash_next_hook_mail_storage_created)
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48 (struct mail_storage *storage);
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49 static int quota_initialized;
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50 static unsigned int trash_quota_module_id;
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51
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52 static pool_t config_pool;
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53 /* trash_boxes ordered by priority, highest first */
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54 static array_t ARRAY_DEFINE(trash_boxes, struct trash_mailbox);
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55
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56 static int trash_clean_mailbox_open(struct trash_mailbox *trash)
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57 {
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58 struct mail_search_arg search_arg;
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59
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60 trash->box = mailbox_open(trash->storage, trash->name, NULL,
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61 MAILBOX_OPEN_KEEP_RECENT);
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62 trash->trans = mailbox_transaction_begin(trash->box, 0);
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63
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64 memset(&search_arg, 0, sizeof(search_arg));
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65 search_arg.type = SEARCH_ALL;
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66
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67 trash->search_ctx =
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68 mailbox_search_init(trash->trans, NULL, &search_arg, NULL);
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69 trash->mail = mail_alloc(trash->trans, MAIL_FETCH_PHYSICAL_SIZE |
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70 MAIL_FETCH_RECEIVED_DATE, NULL);
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71
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72 return mailbox_search_next(trash->search_ctx, trash->mail);
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73 }
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74
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75 static int trash_clean_mailbox_get_next(struct trash_mailbox *trash,
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76 time_t *received_time_r)
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77 {
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78 int ret;
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79
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80 if (!trash->mail_set) {
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81 if (trash->box == NULL)
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82 ret = trash_clean_mailbox_open(trash);
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83 else
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84 ret = mailbox_search_next(trash->search_ctx,
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85 trash->mail);
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86 if (ret <= 0)
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87 return ret;
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88
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89 trash->mail_set = TRUE;
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90 }
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91
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92 *received_time_r = mail_get_received_date(trash->mail);
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93 return 1;
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94 }
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95
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96 static int trash_try_clean_mails(uint64_t size_needed)
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97 {
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98 struct trash_mailbox *trashes;
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99 unsigned int i, j, count, oldest_idx;
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100 time_t oldest, received;
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101 uint64_t size;
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102 int ret = 0;
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103
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104 trashes = array_get_modifyable(&trash_boxes, &count);
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105 for (i = 0; i < count; ) {
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106 /* expunge oldest mails first in all trash boxes with
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107 same priority */
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108 oldest_idx = count;
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109 oldest = (time_t)-1;
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110 for (j = i; j < count; j++) {
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111 if (trashes[j].priority != trashes[j].priority)
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112 break;
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113
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114 ret = trash_clean_mailbox_get_next(&trashes[i],
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115 &received);
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116 if (ret < 0)
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117 goto __err;
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118 if (ret > 0) {
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119 if (oldest == (time_t)-1 ||
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120 received < oldest) {
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121 oldest = received;
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122 oldest_idx = j;
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123 }
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124 }
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125 }
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126
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127 if (oldest_idx < count) {
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128 if (mail_expunge(trashes[oldest_idx].mail) < 0)
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129 break;
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130
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131 size = mail_get_physical_size(trashes[oldest_idx].mail);
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132 if (size >= size_needed) {
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133 size_needed = 0;
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134 break;
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135 }
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136 trashes[oldest_idx].mail_set = FALSE;
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137
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138 size_needed -= size;
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139 } else {
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140 /* find more mails from next priority's mailbox */
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141 i = j;
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142 }
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143 }
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144
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145 __err:
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146 for (i = 0; i < count; i++) {
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147 struct trash_mailbox *trash = &trashes[i];
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148
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149 mail_free(trash->mail);
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150 trash->mail = NULL;
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151
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152 (void)mailbox_search_deinit(trash->search_ctx);
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153 trash->search_ctx = NULL;
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154
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155 if (size_needed == 0) {
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156 (void)mailbox_transaction_commit(trash->trans,
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157 MAILBOX_SYNC_FLAG_FULL_WRITE);
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158 } else {
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159 /* couldn't get enough space, don't expunge anything */
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160 mailbox_transaction_rollback(trash->trans);
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161 }
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162 trash->trans = NULL;
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163
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164 mailbox_close(trash->box);
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165 trash->box = NULL;
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166 }
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167 return size_needed == 0;
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168 }
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169
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170 static int
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171 trash_quota_try_alloc(struct quota_transaction_context *ctx,
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172 struct mail *mail, int *too_large_r)
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173 {
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174 struct trash_quota *tquota = TRASH_CONTEXT(quota);
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175 int ret, i;
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176
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177 for (i = 0; ; i++) {
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178 ret = tquota->super.try_alloc(ctx, mail, too_large_r);
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179 if (ret != 0 || *too_large_r)
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180 return ret;
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181
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182 if (i == MAX_RETRY_COUNT) {
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183 /* trash_try_clean_mails() should have returned 0 if
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184 it couldn't get enough space, but allow retrying
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185 it a couple of times if there was some extra space
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186 that was needed.. */
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187 break;
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188 }
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189
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190 /* not enough space. try deleting some from mailbox. */
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191 ret = trash_try_clean_mails(mail_get_physical_size(mail));
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192 if (ret <= 0)
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193 return 0;
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194 }
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195
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196 return 0;
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197 }
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198
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199 static void trash_quota_deinit(struct quota *quota)
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200 {
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201 struct trash_quota *tquota = TRASH_CONTEXT(quota);
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202 void *null = NULL;
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203
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204 array_idx_set(&quota->quota_module_contexts,
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205 trash_quota_module_id, &null);
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206 tquota->super.deinit(quota);
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207 i_free(tquota);
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208 }
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209
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210 static void trash_mail_storage_created(struct mail_storage *storage)
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211 {
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212 struct trash_quota *tquota;
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213
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214 if (trash_next_hook_mail_storage_created != NULL)
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215 trash_next_hook_mail_storage_created(storage);
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216
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217 if (quota_initialized || quota == NULL)
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218 return;
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219
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220 /* initialize here because plugins could be loaded in wrong order */
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221 quota_initialized = TRUE;
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222
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223 tquota = i_new(struct trash_quota, 1);
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224 tquota->super = *quota;
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225 quota->deinit = trash_quota_deinit;
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226 quota->try_alloc = trash_quota_try_alloc;
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227
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228 trash_quota_module_id = quota_module_id++;
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229 array_idx_set(&quota->quota_module_contexts,
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230 trash_quota_module_id, &tquota);
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231 }
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232
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233 static int trash_mailbox_priority_cmp(const void *p1, const void *p2)
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234 {
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235 const struct trash_mailbox *t1 = p1, *t2 = p2;
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236
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237 return t1->priority - t2->priority;
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238 }
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239
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240 static int read_configuration(const char *path)
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241 {
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242 struct istream *input;
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243 const char *line, *name;
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244 struct trash_mailbox *trash;
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245 int fd;
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246
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247 fd = open(path, O_RDONLY);
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248 if (fd == -1) {
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249 if (errno != ENOENT)
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250 i_error("open(%s) failed: %m", path);
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251 return -1;
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252 }
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253
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254 p_clear(config_pool);
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255 ARRAY_CREATE(&trash_boxes, config_pool, struct trash_mailbox, 8);
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256
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257 input = i_stream_create_file(fd, default_pool, (size_t)-1, FALSE);
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258 while ((line = i_stream_read_next_line(input)) != NULL) {
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259 /* <priority> <mailbox name> */
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260 name = strchr(line, ' ');
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261 if (name == NULL || name[1] == '\0')
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262 continue;
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263
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264 trash = array_append_space(&trash_boxes);
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265 trash->name = p_strdup(config_pool, name+1);
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266 trash->priority = atoi(t_strdup_until(line, name));
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267 }
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268 i_stream_unref(input);
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269 (void)close(fd);
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270
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271 qsort(array_get_modifyable(&trash_boxes, NULL),
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272 array_count(&trash_boxes), sizeof(struct trash_mailbox),
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273 trash_mailbox_priority_cmp);
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274 return 0;
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275 }
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276
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277 void trash_plugin_init(void)
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278 {
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279 quota_initialized = FALSE;
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280 trash_next_hook_mail_storage_created = hook_mail_storage_created;
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281
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282 config_pool = pool_alloconly_create("trash config", 1024);
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283 if (read_configuration(home_expand(LOCAL_CONFIG_FILE)) < 0) {
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284 if (read_configuration(GLOBAL_CONFIG_FILE) < 0)
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285 return;
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286 }
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287
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288 hook_mail_storage_created = trash_mail_storage_created;
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289 }
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290
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291 void trash_plugin_deinit(void)
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292 {
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293 pool_unref(config_pool);
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294 hook_mail_storage_created = trash_next_hook_mail_storage_created;
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295 }