Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/plugins/trash/trash-plugin.c @ 5147:6b0032df7008 HEAD

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If trash mailbox can't be opened, don't crash.
author Timo Sirainen <tss@iki.fi>
date Fri, 16 Feb 2007 14:15:28 +0200
parents 967de900c73a
children df22aec605b7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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"
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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 MAX_RETRY_COUNT 3
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17
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18 struct trash_mailbox {
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19 const char *name;
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20 int priority; /* lower number = higher priority */
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21
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22 struct mail_storage *storage;
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23
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24 /* temporarily set while cleaning: */
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25 struct mailbox *box;
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26 struct mailbox_transaction_context *trans;
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27 struct mail_search_arg search_arg;
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28 struct mail_search_context *search_ctx;
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29 struct mail *mail;
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30
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31 unsigned int mail_set:1;
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32 };
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33
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34 static int (*trash_next_quota_test_alloc)(struct quota_transaction_context *,
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35 uoff_t, bool *);
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36
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37 static pool_t config_pool;
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38 /* trash_boxes ordered by priority, highest first */
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39 static ARRAY_DEFINE(trash_boxes, struct trash_mailbox);
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40
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41 static int sync_mailbox(struct mailbox *box)
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42 {
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43 struct mailbox_sync_context *ctx;
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44 struct mailbox_sync_rec sync_rec;
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45
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46 ctx = mailbox_sync_init(box, MAILBOX_SYNC_FLAG_FULL_READ);
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47 while (mailbox_sync_next(ctx, &sync_rec) > 0)
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48 ;
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49 return mailbox_sync_deinit(&ctx, 0, NULL);
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50 }
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51
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52 static int trash_clean_mailbox_open(struct trash_mailbox *trash)
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53 {
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54 trash->box = mailbox_open(trash->storage, trash->name, NULL,
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55 MAILBOX_OPEN_KEEP_RECENT);
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56 if (trash->box == NULL)
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57 return -1;
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58
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59 if (sync_mailbox(trash->box) < 0)
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60 return -1;
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61
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62 trash->trans = mailbox_transaction_begin(trash->box, 0);
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63
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64 trash->search_ctx = mailbox_search_init(trash->trans, NULL,
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65 &trash->search_arg, NULL);
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66 trash->mail = mail_alloc(trash->trans, MAIL_FETCH_PHYSICAL_SIZE |
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67 MAIL_FETCH_RECEIVED_DATE, NULL);
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68
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69 return mailbox_search_next(trash->search_ctx, trash->mail);
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70 }
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71
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72 static int trash_clean_mailbox_get_next(struct trash_mailbox *trash,
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73 time_t *received_time_r)
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74 {
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75 int ret;
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76
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77 if (!trash->mail_set) {
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78 if (trash->box == NULL)
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79 ret = trash_clean_mailbox_open(trash);
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80 else
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81 ret = mailbox_search_next(trash->search_ctx,
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82 trash->mail);
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83 if (ret <= 0)
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84 return ret;
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85
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86 trash->mail_set = TRUE;
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87 }
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88
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89 *received_time_r = mail_get_received_date(trash->mail);
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90 return 1;
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91 }
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92
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93 static int trash_try_clean_mails(uint64_t size_needed)
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94 {
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95 struct trash_mailbox *trashes;
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96 unsigned int i, j, count, oldest_idx;
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97 time_t oldest, received;
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98 uint64_t size;
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99 int ret = 0;
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100
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101 trashes = array_get_modifiable(&trash_boxes, &count);
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102 for (i = 0; i < count; ) {
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103 if (trashes[i].storage == NULL) {
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104 /* FIXME: this is really ugly. it'll do however until
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105 we get proper namespace support for lib-storage. */
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106 struct mail_storage *const *storage;
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107
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108 storage = array_idx(&quota_set->storages, 0);
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109 trashes[i].storage = *storage;
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110 }
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111 /* expunge oldest mails first in all trash boxes with
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112 same priority */
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113 oldest_idx = count;
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114 oldest = (time_t)-1;
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115 for (j = i; j < count; j++) {
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116 if (trashes[j].priority != trashes[j].priority)
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117 break;
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118
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119 ret = trash_clean_mailbox_get_next(&trashes[i],
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120 &received);
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121 if (ret < 0)
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122 goto __err;
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123 if (ret > 0) {
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124 if (oldest == (time_t)-1 ||
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125 received < oldest) {
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126 oldest = received;
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127 oldest_idx = j;
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128 }
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129 }
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130 }
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131
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132 if (oldest_idx < count) {
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133 if (mail_expunge(trashes[oldest_idx].mail) < 0)
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134 break;
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135
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136 size = mail_get_physical_size(trashes[oldest_idx].mail);
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137 if (size >= size_needed) {
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138 size_needed = 0;
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139 break;
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140 }
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141 trashes[oldest_idx].mail_set = FALSE;
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142
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143 size_needed -= size;
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144 } else {
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145 /* find more mails from next priority's mailbox */
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146 i = j;
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147 }
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148 }
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149
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150 __err:
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151 for (i = 0; i < count; i++) {
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152 struct trash_mailbox *trash = &trashes[i];
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153
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154 trash->mail_set = FALSE;
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155 mail_free(&trash->mail);
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156 (void)mailbox_search_deinit(&trash->search_ctx);
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157
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158 if (size_needed == 0) {
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159 (void)mailbox_transaction_commit(&trash->trans,
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160 MAILBOX_SYNC_FLAG_FULL_WRITE);
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161 } else {
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162 /* couldn't get enough space, don't expunge anything */
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163 mailbox_transaction_rollback(&trash->trans);
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164 }
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165
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166 mailbox_close(&trash->box);
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167 }
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168 return size_needed == 0;
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169 }
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170
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171 static int
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172 trash_quota_test_alloc(struct quota_transaction_context *ctx,
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173 uoff_t size, bool *too_large_r)
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174 {
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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 = trash_next_quota_test_alloc(ctx, size, 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(size);
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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 int trash_mailbox_priority_cmp(const void *p1, const void *p2)
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200 {
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201 const struct trash_mailbox *t1 = p1, *t2 = p2;
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202
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203 return t1->priority - t2->priority;
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204 }
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205
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206 static int read_configuration(const char *path)
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207 {
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208 struct istream *input;
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209 const char *line, *name;
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210 struct trash_mailbox *trash;
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211 unsigned int count;
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212 int fd;
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213
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214 fd = open(path, O_RDONLY);
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215 if (fd == -1) {
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216 i_error("open(%s) failed: %m", path);
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217 return -1;
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218 }
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219
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220 p_clear(config_pool);
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bf4e98a0de3f Replaced ARRAY_CREATE() macro with [ipt]_array_init() macros. The macro
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221 p_array_init(&trash_boxes, config_pool, 8);
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222
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223 input = i_stream_create_file(fd, default_pool, (size_t)-1, FALSE);
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224 while ((line = i_stream_read_next_line(input)) != NULL) {
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225 /* <priority> <mailbox name> */
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226 name = strchr(line, ' ');
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227 if (name == NULL || name[1] == '\0')
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228 continue;
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229
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230 trash = array_append_space(&trash_boxes);
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231 trash->name = p_strdup(config_pool, name+1);
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232 trash->priority = atoi(t_strdup_until(line, name));
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233 trash->search_arg.type = SEARCH_ALL;
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234 }
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71b8faa84ec6 Added i_stream_destroy() and o_stream_destroy() and used them instead of
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235 i_stream_destroy(&input);
3738
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236 (void)close(fd);
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237
4602
444edc8abef9 Don't allow giving NULL parameter to array_get() or array_get_modifiable().
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238 trash = array_get_modifiable(&trash_boxes, &count);
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239 qsort(trash, count, sizeof(*trash), trash_mailbox_priority_cmp);
3738
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240 return 0;
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241 }
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242
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243 void trash_plugin_init(void)
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244 {
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245 const char *env;
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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246
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247 env = getenv("TRASH");
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248 if (env == NULL)
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249 return;
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250
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49c9e7588de4 s/quota/quota_set/ so we don't conflict with the quota symbol already
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251 if (quota_set == NULL) {
4400
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diff changeset
252 i_error("trash plugin: quota plugin not initialized");
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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253 return;
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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diff changeset
254 }
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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255
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256 config_pool = pool_alloconly_create("trash config", 1024);
4400
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257 if (read_configuration(env) < 0)
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258 return;
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259
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diff changeset
260 trash_next_quota_test_alloc = quota_set->test_alloc;
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diff changeset
261 quota_set->test_alloc = trash_quota_test_alloc;
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262 }
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263
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diff changeset
264 void trash_plugin_deinit(void)
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265 {
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diff changeset
266 quota_set->test_alloc = trash_next_quota_test_alloc;
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267
4400
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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268 if (config_pool != NULL)
593523f53500 Removed hardcoded trash plugin configuration paths. Added information about
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269 pool_unref(config_pool);
3738
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270 }