Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/plugins/trash/trash-plugin.c @ 3863:55df57c028d4 HEAD
Added "bool" type and changed all ints that were used as booleans to bool.
author | Timo Sirainen <tss@iki.fi> |
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date | Fri, 13 Jan 2006 22:25:57 +0200 |
parents | 732b62dc1976 |
children | 928229f8b3e6 |
rev | line source |
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3738
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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 bool 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, bool *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("a->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("a->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 } |