Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/plugins/trash/trash-plugin.c @ 5577:1fd9616157e4 HEAD
Updated to support namespaces
author | Timo Sirainen <tss@iki.fi> |
---|---|
date | Tue, 17 Apr 2007 21:00:48 +0300 |
parents | 67b8d61c988f |
children | 6074e9e6059d |
rev | line source |
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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" |
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 sync_mailbox(struct mailbox *box) |
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46 { |
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47 struct mailbox_sync_context *ctx; |
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48 struct mailbox_sync_rec sync_rec; |
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49 |
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50 ctx = mailbox_sync_init(box, MAILBOX_SYNC_FLAG_FULL_READ); |
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51 while (mailbox_sync_next(ctx, &sync_rec) > 0) |
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52 ; |
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53 return mailbox_sync_deinit(&ctx, 0, NULL); |
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54 } |
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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 trash->box = mailbox_open(trash->storage, trash->name, NULL, |
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59 MAILBOX_OPEN_KEEP_RECENT); |
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60 if (trash->box == NULL) |
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61 return 0; |
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62 |
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63 if (sync_mailbox(trash->box) < 0) |
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64 return -1; |
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65 |
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66 trash->trans = mailbox_transaction_begin(trash->box, 0); |
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67 |
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68 trash->search_ctx = mailbox_search_init(trash->trans, NULL, |
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69 &trash->search_arg, NULL); |
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70 trash->mail = mail_alloc(trash->trans, MAIL_FETCH_PHYSICAL_SIZE | |
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71 MAIL_FETCH_RECEIVED_DATE, NULL); |
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72 |
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73 return mailbox_search_next(trash->search_ctx, trash->mail); |
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74 } |
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75 |
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76 static int trash_clean_mailbox_get_next(struct trash_mailbox *trash, |
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77 time_t *received_time_r) |
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78 { |
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79 int ret; |
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80 |
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81 if (!trash->mail_set) { |
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82 if (trash->box == NULL) |
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83 ret = trash_clean_mailbox_open(trash); |
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84 else |
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85 ret = mailbox_search_next(trash->search_ctx, |
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86 trash->mail); |
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87 if (ret <= 0) { |
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88 *received_time_r = 0; |
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89 return ret; |
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90 } |
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91 trash->mail_set = TRUE; |
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92 } |
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93 |
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94 *received_time_r = mail_get_received_date(trash->mail); |
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95 return 1; |
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96 } |
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97 |
5577 | 98 static void trash_find_storage(struct trash_mailbox *trash) |
99 { | |
100 struct mail_storage *const *storages; | |
101 unsigned int i, count; | |
102 | |
103 storages = array_get("a_set->storages, &count); | |
104 for (i = 0; i < count; i++) { | |
105 if (mail_namespace_update_name(storages[i]->ns, &trash->name)) { | |
106 trash->storage = storages[i]; | |
107 return; | |
108 } | |
109 } | |
110 i_fatal("trash: Namespace not found for mailbox '%s'", trash->name); | |
111 } | |
112 | |
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113 static int trash_try_clean_mails(struct quota_transaction_context *ctx, |
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114 uint64_t size_needed) |
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115 { |
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116 struct trash_mailbox *trashes; |
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117 unsigned int i, j, count, oldest_idx; |
5297 | 118 time_t oldest, received = 0; |
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119 uint64_t size, size_expunged = 0, expunged_count = 0; |
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120 int ret = 0; |
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121 |
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122 trashes = array_get_modifiable(&trash_boxes, &count); |
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123 for (i = 0; i < count; ) { |
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124 /* expunge oldest mails first in all trash boxes with |
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125 same priority */ |
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126 oldest_idx = count; |
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127 oldest = (time_t)-1; |
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128 for (j = i; j < count; j++) { |
5189 | 129 if (trashes[j].priority != trashes[i].priority) |
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130 break; |
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131 |
5577 | 132 if (trashes[j].storage == NULL) |
133 trash_find_storage(&trashes[j]); | |
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134 |
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135 ret = trash_clean_mailbox_get_next(&trashes[j], |
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136 &received); |
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137 if (ret < 0) |
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138 goto __err; |
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139 if (ret > 0) { |
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140 if (oldest == (time_t)-1 || received < oldest) { |
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141 oldest = received; |
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142 oldest_idx = j; |
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143 } |
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144 } |
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145 } |
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146 |
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147 if (oldest_idx < count) { |
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148 size = mail_get_physical_size(trashes[oldest_idx].mail); |
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149 if (size == (uoff_t)-1) { |
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150 /* maybe expunged already? */ |
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151 trashes[oldest_idx].mail_set = FALSE; |
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152 continue; |
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153 } |
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154 |
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155 if (mail_expunge(trashes[oldest_idx].mail) < 0) |
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156 break; |
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157 |
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158 expunged_count++; |
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159 size_expunged += size; |
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160 if (size_expunged >= size_needed) |
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161 break; |
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162 trashes[oldest_idx].mail_set = FALSE; |
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163 } else { |
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164 /* find more mails from next priority's mailbox */ |
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165 i = j; |
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166 } |
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167 } |
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168 |
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169 __err: |
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170 for (i = 0; i < count; i++) { |
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171 struct trash_mailbox *trash = &trashes[i]; |
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172 |
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173 if (trash->box == NULL) |
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174 continue; |
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175 |
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176 trash->mail_set = FALSE; |
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177 mail_free(&trash->mail); |
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178 (void)mailbox_search_deinit(&trash->search_ctx); |
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179 |
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180 if (size_expunged >= size_needed) { |
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181 (void)mailbox_transaction_commit(&trash->trans, |
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182 MAILBOX_SYNC_FLAG_FULL_WRITE); |
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183 } else { |
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184 /* couldn't get enough space, don't expunge anything */ |
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185 mailbox_transaction_rollback(&trash->trans); |
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186 } |
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187 |
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188 mailbox_close(&trash->box); |
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189 } |
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190 |
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191 if (size_expunged < size_needed) |
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192 return FALSE; |
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193 |
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194 ctx->bytes_used = ctx->bytes_used > (int64_t)size_expunged ? |
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195 ctx->bytes_used - size_expunged : 0; |
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196 ctx->count_used = ctx->count_used > (int64_t)expunged_count ? |
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197 ctx->count_used - expunged_count : 0; |
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198 return TRUE; |
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199 } |
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200 |
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201 static int |
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202 trash_quota_test_alloc(struct quota_transaction_context *ctx, |
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203 uoff_t size, bool *too_large_r) |
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204 { |
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205 int ret, i; |
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206 |
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207 for (i = 0; ; i++) { |
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208 ret = trash_next_quota_test_alloc(ctx, size, too_large_r); |
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209 if (ret != 0 || *too_large_r) |
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210 return ret; |
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211 |
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212 if (i == MAX_RETRY_COUNT) { |
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213 /* trash_try_clean_mails() should have returned 0 if |
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214 it couldn't get enough space, but allow retrying |
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|
215 it a couple of times if there was some extra space |
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|
216 that was needed.. */ |
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217 break; |
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218 } |
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219 |
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220 /* not enough space. try deleting some from mailbox. */ |
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221 ret = trash_try_clean_mails(ctx, size); |
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222 if (ret <= 0) |
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223 return 0; |
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224 } |
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225 |
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226 return 0; |
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|
227 } |
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228 |
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229 static int trash_mailbox_priority_cmp(const void *p1, const void *p2) |
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230 { |
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231 const struct trash_mailbox *t1 = p1, *t2 = p2; |
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232 |
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233 return t1->priority - t2->priority; |
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234 } |
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235 |
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|
236 static int read_configuration(const char *path) |
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|
237 { |
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238 struct istream *input; |
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239 const char *line, *name; |
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|
240 struct trash_mailbox *trash; |
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241 unsigned int count; |
3738
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242 int fd; |
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|
243 |
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244 fd = open(path, O_RDONLY); |
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245 if (fd == -1) { |
4400
593523f53500
Removed hardcoded trash plugin configuration paths. Added information about
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|
246 i_error("open(%s) failed: %m", path); |
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247 return -1; |
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|
248 } |
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249 |
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|
250 p_clear(config_pool); |
5187
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Minor memory allocation optimizations.
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5185
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|
251 p_array_init(&trash_boxes, config_pool, INIT_TRASH_MAILBOX_COUNT); |
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252 |
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|
253 input = i_stream_create_file(fd, default_pool, (size_t)-1, FALSE); |
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254 while ((line = i_stream_read_next_line(input)) != NULL) { |
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|
255 /* <priority> <mailbox name> */ |
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|
256 name = strchr(line, ' '); |
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|
257 if (name == NULL || name[1] == '\0') |
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|
258 continue; |
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|
259 |
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|
260 trash = array_append_space(&trash_boxes); |
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|
261 trash->name = p_strdup(config_pool, name+1); |
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|
262 trash->priority = atoi(t_strdup_until(line, name)); |
4748
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|
263 trash->search_arg.type = SEARCH_ALL; |
3738
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|
264 } |
4070
71b8faa84ec6
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|
265 i_stream_destroy(&input); |
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266 (void)close(fd); |
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267 |
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|
268 trash = array_get_modifiable(&trash_boxes, &count); |
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269 qsort(trash, count, sizeof(*trash), trash_mailbox_priority_cmp); |
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270 return 0; |
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271 } |
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272 |
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273 void trash_plugin_init(void) |
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274 { |
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275 const char *env; |
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276 |
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277 env = getenv("TRASH"); |
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278 if (env == NULL) |
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279 return; |
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280 |
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281 if (quota_set == NULL) { |
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282 i_error("trash plugin: quota plugin not initialized"); |
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283 return; |
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284 } |
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285 |
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286 config_pool = pool_alloconly_create("trash config", |
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287 sizeof(trash_boxes) + |
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288 BUFFER_APPROX_SIZE + |
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289 INIT_TRASH_MAILBOX_COUNT * |
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290 (sizeof(struct trash_mailbox) + 32)); |
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291 if (read_configuration(env) < 0) |
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292 return; |
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293 |
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294 trash_next_quota_test_alloc = quota_set->test_alloc; |
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295 quota_set->test_alloc = trash_quota_test_alloc; |
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296 } |
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297 |
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298 void trash_plugin_deinit(void) |
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299 { |
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300 quota_set->test_alloc = trash_next_quota_test_alloc; |
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301 |
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302 if (config_pool != NULL) |
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303 pool_unref(config_pool); |
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304 } |