Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/plugins/trash/trash-plugin.c @ 6512:1a3604c8ee05 HEAD
mailbox_transaction_commit*() doesn't sync the mailbox anymore, so it
shouldn't take mailbox_sync_flags parameter either.
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Sun, 30 Sep 2007 17:03:26 +0300 |
parents | aeee5076f99f |
children | 7ed926ed7aa4 |
rev | line source |
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Replaced my Copyright notices. The year range always ends with 2007 now.
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1 /* Copyright (c) 2005-2007 Dovecot authors, see the included COPYING file */ |
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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" |
5577 | 7 #include "mail-namespace.h" |
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8 #include "mail-search.h" |
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9 #include "quota-private.h" |
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10 #include "quota-plugin.h" |
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11 #include "trash-plugin.h" |
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12 |
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13 #include <stdlib.h> |
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14 #include <unistd.h> |
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15 #include <fcntl.h> |
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16 |
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17 #define INIT_TRASH_MAILBOX_COUNT 4 |
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18 #define MAX_RETRY_COUNT 3 |
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19 |
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20 struct trash_mailbox { |
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21 const char *name; |
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22 int priority; /* lower number = higher priority */ |
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23 |
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24 struct mail_storage *storage; |
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25 |
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26 /* temporarily set while cleaning: */ |
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27 struct mailbox *box; |
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28 struct mailbox_transaction_context *trans; |
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29 struct mail_search_arg search_arg; |
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30 struct mail_search_context *search_ctx; |
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31 struct mail *mail; |
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32 |
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33 unsigned int mail_set:1; |
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34 }; |
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35 |
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36 const char *trash_plugin_version = PACKAGE_VERSION; |
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37 |
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38 static int (*trash_next_quota_test_alloc)(struct quota_transaction_context *, |
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39 uoff_t, bool *); |
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40 |
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41 static pool_t config_pool; |
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42 /* trash_boxes ordered by priority, highest first */ |
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43 static ARRAY_DEFINE(trash_boxes, struct trash_mailbox); |
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44 |
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45 static int trash_clean_mailbox_open(struct trash_mailbox *trash) |
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46 { |
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47 trash->box = mailbox_open(trash->storage, trash->name, NULL, |
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48 MAILBOX_OPEN_KEEP_RECENT); |
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49 if (trash->box == NULL) |
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50 return 0; |
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51 |
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52 if (mailbox_sync(trash->box, MAILBOX_SYNC_FLAG_FULL_READ, 0, NULL) < 0) |
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53 return -1; |
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54 |
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55 trash->trans = mailbox_transaction_begin(trash->box, 0); |
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56 |
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57 trash->search_ctx = mailbox_search_init(trash->trans, NULL, |
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58 &trash->search_arg, NULL); |
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59 trash->mail = mail_alloc(trash->trans, MAIL_FETCH_PHYSICAL_SIZE | |
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60 MAIL_FETCH_RECEIVED_DATE, NULL); |
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61 |
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62 return mailbox_search_next(trash->search_ctx, trash->mail); |
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63 } |
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64 |
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65 static int trash_clean_mailbox_get_next(struct trash_mailbox *trash, |
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66 time_t *received_time_r) |
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67 { |
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68 int ret; |
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69 |
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70 if (!trash->mail_set) { |
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71 if (trash->box == NULL) |
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72 ret = trash_clean_mailbox_open(trash); |
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73 else |
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74 ret = mailbox_search_next(trash->search_ctx, |
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75 trash->mail); |
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76 if (ret <= 0) { |
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77 *received_time_r = 0; |
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78 return ret; |
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79 } |
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80 trash->mail_set = TRUE; |
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81 } |
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82 |
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83 if (mail_get_received_date(trash->mail, received_time_r) < 0) |
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84 return -1; |
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85 return 1; |
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86 } |
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87 |
5577 | 88 static void trash_find_storage(struct trash_mailbox *trash) |
89 { | |
90 struct mail_storage *const *storages; | |
91 unsigned int i, count; | |
92 | |
93 storages = array_get("a_set->storages, &count); | |
94 for (i = 0; i < count; i++) { | |
95 if (mail_namespace_update_name(storages[i]->ns, &trash->name)) { | |
96 trash->storage = storages[i]; | |
97 return; | |
98 } | |
99 } | |
100 i_fatal("trash: Namespace not found for mailbox '%s'", trash->name); | |
101 } | |
102 | |
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103 static int trash_try_clean_mails(struct quota_transaction_context *ctx, |
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104 uint64_t size_needed) |
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105 { |
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106 struct trash_mailbox *trashes; |
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107 unsigned int i, j, count, oldest_idx; |
5297 | 108 time_t oldest, received = 0; |
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109 uint64_t size, size_expunged = 0, expunged_count = 0; |
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110 int ret = 0; |
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111 |
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112 trashes = array_get_modifiable(&trash_boxes, &count); |
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113 for (i = 0; i < count; ) { |
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114 /* expunge oldest mails first in all trash boxes with |
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115 same priority */ |
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116 oldest_idx = count; |
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117 oldest = (time_t)-1; |
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118 for (j = i; j < count; j++) { |
5189 | 119 if (trashes[j].priority != trashes[i].priority) |
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120 break; |
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121 |
5577 | 122 if (trashes[j].storage == NULL) |
123 trash_find_storage(&trashes[j]); | |
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124 |
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125 ret = trash_clean_mailbox_get_next(&trashes[j], |
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126 &received); |
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127 if (ret < 0) |
6412 | 128 goto err; |
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129 if (ret > 0) { |
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130 if (oldest == (time_t)-1 || received < oldest) { |
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131 oldest = received; |
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132 oldest_idx = j; |
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133 } |
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134 } |
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135 } |
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136 |
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137 if (oldest_idx < count) { |
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138 if (mail_get_physical_size(trashes[oldest_idx].mail, |
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139 &size) < 0) { |
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140 /* maybe expunged already? */ |
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141 trashes[oldest_idx].mail_set = FALSE; |
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142 continue; |
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143 } |
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144 |
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145 mail_expunge(trashes[oldest_idx].mail); |
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146 expunged_count++; |
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147 size_expunged += size; |
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148 if (size_expunged >= size_needed) |
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149 break; |
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150 trashes[oldest_idx].mail_set = FALSE; |
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151 } else { |
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152 /* find more mails from next priority's mailbox */ |
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153 i = j; |
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154 } |
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155 } |
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156 |
6412 | 157 err: |
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158 for (i = 0; i < count; i++) { |
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159 struct trash_mailbox *trash = &trashes[i]; |
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160 |
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161 if (trash->box == NULL) |
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162 continue; |
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163 |
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164 trash->mail_set = FALSE; |
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165 mail_free(&trash->mail); |
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166 (void)mailbox_search_deinit(&trash->search_ctx); |
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167 |
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168 if (size_expunged >= size_needed) |
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169 (void)mailbox_transaction_commit(&trash->trans); |
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170 else { |
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171 /* couldn't get enough space, don't expunge anything */ |
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172 mailbox_transaction_rollback(&trash->trans); |
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173 } |
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174 |
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175 mailbox_close(&trash->box); |
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176 } |
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177 |
6024 | 178 if (size_expunged < size_needed) { |
179 if (getenv("DEBUG") != NULL) { | |
180 i_info("trash plugin: Failed to remove enough messages " | |
181 "(needed %llu bytes, expunged only %llu bytes)", | |
182 (unsigned long long)size_needed, | |
183 (unsigned long long)size_expunged); | |
184 } | |
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185 return FALSE; |
6024 | 186 } |
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187 |
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188 ctx->bytes_used = ctx->bytes_used > (int64_t)size_expunged ? |
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189 ctx->bytes_used - size_expunged : 0; |
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190 ctx->count_used = ctx->count_used > (int64_t)expunged_count ? |
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191 ctx->count_used - expunged_count : 0; |
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192 return TRUE; |
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193 } |
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194 |
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195 static int |
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196 trash_quota_test_alloc(struct quota_transaction_context *ctx, |
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197 uoff_t size, bool *too_large_r) |
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198 { |
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199 int ret, i; |
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200 |
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201 for (i = 0; ; i++) { |
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202 ret = trash_next_quota_test_alloc(ctx, size, too_large_r); |
6024 | 203 if (ret != 0 || *too_large_r) { |
204 if (getenv("DEBUG") != NULL && *too_large_r) { | |
205 i_info("trash plugin: Mail is larger than " | |
206 "quota, won't even try to handle"); | |
207 } | |
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208 return ret; |
6024 | 209 } |
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210 |
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211 if (i == MAX_RETRY_COUNT) { |
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212 /* trash_try_clean_mails() should have returned 0 if |
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213 it couldn't get enough space, but allow retrying |
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214 it a couple of times if there was some extra space |
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215 that was needed.. */ |
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216 break; |
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217 } |
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218 |
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219 /* not enough space. try deleting some from mailbox. */ |
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220 ret = trash_try_clean_mails(ctx, size); |
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221 if (ret <= 0) |
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222 return 0; |
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223 } |
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224 |
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225 return 0; |
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226 } |
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227 |
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228 static int trash_mailbox_priority_cmp(const void *p1, const void *p2) |
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229 { |
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230 const struct trash_mailbox *t1 = p1, *t2 = p2; |
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231 |
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232 return t1->priority - t2->priority; |
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233 } |
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234 |
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235 static int read_configuration(const char *path) |
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236 { |
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237 struct istream *input; |
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238 const char *line, *name; |
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239 struct trash_mailbox *trash; |
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240 unsigned int count; |
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241 int fd; |
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242 |
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243 fd = open(path, O_RDONLY); |
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244 if (fd == -1) { |
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245 i_error("open(%s) failed: %m", path); |
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246 return -1; |
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247 } |
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248 |
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249 p_clear(config_pool); |
5187
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Minor memory allocation optimizations.
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250 p_array_init(&trash_boxes, config_pool, INIT_TRASH_MAILBOX_COUNT); |
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251 |
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252 input = i_stream_create_fd(fd, (size_t)-1, FALSE); |
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253 while ((line = i_stream_read_next_line(input)) != NULL) { |
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254 /* <priority> <mailbox name> */ |
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255 name = strchr(line, ' '); |
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256 if (name == NULL || name[1] == '\0') |
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257 continue; |
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258 |
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259 trash = array_append_space(&trash_boxes); |
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260 trash->name = p_strdup(config_pool, name+1); |
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261 trash->priority = atoi(t_strdup_until(line, name)); |
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262 trash->search_arg.type = SEARCH_ALL; |
6024 | 263 |
264 if (getenv("DEBUG") != NULL) { | |
265 i_info("trash plugin: Added '%s' with priority %d", | |
266 trash->name, trash->priority); | |
267 } | |
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268 } |
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269 i_stream_destroy(&input); |
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270 (void)close(fd); |
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271 |
4602
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272 trash = array_get_modifiable(&trash_boxes, &count); |
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273 qsort(trash, count, sizeof(*trash), 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 const char *env; |
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280 |
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281 env = getenv("TRASH"); |
6024 | 282 if (env == NULL) { |
283 if (getenv("DEBUG") != NULL) | |
284 i_info("trash plugin: No trash setting, disabled"); | |
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285 return; |
6024 | 286 } |
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287 |
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288 if (quota_set == NULL) { |
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289 i_error("trash plugin: quota plugin not initialized"); |
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290 return; |
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291 } |
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292 |
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293 config_pool = pool_alloconly_create("trash config", |
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294 sizeof(trash_boxes) + |
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295 BUFFER_APPROX_SIZE + |
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296 INIT_TRASH_MAILBOX_COUNT * |
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297 (sizeof(struct trash_mailbox) + 32)); |
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298 if (read_configuration(env) < 0) |
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299 return; |
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300 |
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301 trash_next_quota_test_alloc = quota_set->test_alloc; |
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302 quota_set->test_alloc = trash_quota_test_alloc; |
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303 } |
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304 |
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305 void trash_plugin_deinit(void) |
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306 { |
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307 quota_set->test_alloc = trash_next_quota_test_alloc; |
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308 |
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309 if (config_pool != NULL) |
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310 pool_unref(&config_pool); |
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311 } |