Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/plugins/trash/trash-plugin.c @ 4084:51306837698b HEAD

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Quota API redesign. Still not perfect, but better than before. Quota backends no longer need to be told where the mails exist. fs backend doesn't work correctly with multiple partitions (if you've multiple namespaces).
author Timo Sirainen <timo.sirainen@movial.fi>
date Wed, 01 Mar 2006 11:14:59 +0200
parents 71b8faa84ec6
children 593523f53500
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 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
4084
51306837698b Quota API redesign. Still not perfect, but better than before. Quota backends no longer need to be told where the mails exist. fs backend doesn't work correctly with multiple partitions (if you've multiple namespaces).
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25 struct trash_quota_root {
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26 struct quota_backend_vfuncs 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_quota_root_created)(struct quota_root *root);
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46
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47 static void (*trash_next_hook_quota_root_created)(struct quota_root *root);
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48 static unsigned int trash_quota_module_id;
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49
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50 static pool_t config_pool;
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51 /* trash_boxes ordered by priority, highest first */
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52 static array_t ARRAY_DEFINE(trash_boxes, struct trash_mailbox);
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53
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54 static int trash_clean_mailbox_open(struct trash_mailbox *trash)
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55 {
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56 struct mail_search_arg search_arg;
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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 trash->trans = mailbox_transaction_begin(trash->box, 0);
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61
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62 memset(&search_arg, 0, sizeof(search_arg));
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63 search_arg.type = SEARCH_ALL;
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64
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65 trash->search_ctx =
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66 mailbox_search_init(trash->trans, NULL, &search_arg, NULL);
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67 trash->mail = mail_alloc(trash->trans, MAIL_FETCH_PHYSICAL_SIZE |
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68 MAIL_FETCH_RECEIVED_DATE, NULL);
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69
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70 return mailbox_search_next(trash->search_ctx, trash->mail);
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71 }
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72
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73 static int trash_clean_mailbox_get_next(struct trash_mailbox *trash,
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74 time_t *received_time_r)
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75 {
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76 int ret;
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77
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78 if (!trash->mail_set) {
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79 if (trash->box == NULL)
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80 ret = trash_clean_mailbox_open(trash);
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81 else
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82 ret = mailbox_search_next(trash->search_ctx,
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83 trash->mail);
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84 if (ret <= 0)
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85 return ret;
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86
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87 trash->mail_set = TRUE;
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88 }
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89
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90 *received_time_r = mail_get_received_date(trash->mail);
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91 return 1;
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92 }
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93
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94 static int trash_try_clean_mails(uint64_t size_needed)
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95 {
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96 struct trash_mailbox *trashes;
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97 unsigned int i, j, count, oldest_idx;
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98 time_t oldest, received;
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99 uint64_t size;
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100 int ret = 0;
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101
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102 trashes = array_get_modifyable(&trash_boxes, &count);
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103 for (i = 0; i < count; ) {
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104 /* expunge oldest mails first in all trash boxes with
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105 same priority */
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106 oldest_idx = count;
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107 oldest = (time_t)-1;
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108 for (j = i; j < count; j++) {
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109 if (trashes[j].priority != trashes[j].priority)
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110 break;
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111
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112 ret = trash_clean_mailbox_get_next(&trashes[i],
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113 &received);
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114 if (ret < 0)
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115 goto __err;
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116 if (ret > 0) {
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117 if (oldest == (time_t)-1 ||
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118 received < oldest) {
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119 oldest = received;
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120 oldest_idx = j;
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121 }
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122 }
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123 }
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124
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125 if (oldest_idx < count) {
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126 if (mail_expunge(trashes[oldest_idx].mail) < 0)
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127 break;
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128
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129 size = mail_get_physical_size(trashes[oldest_idx].mail);
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130 if (size >= size_needed) {
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131 size_needed = 0;
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132 break;
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133 }
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134 trashes[oldest_idx].mail_set = FALSE;
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135
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136 size_needed -= size;
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137 } else {
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138 /* find more mails from next priority's mailbox */
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139 i = j;
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140 }
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141 }
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142
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143 __err:
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144 for (i = 0; i < count; i++) {
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145 struct trash_mailbox *trash = &trashes[i];
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146
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147 mail_free(&trash->mail);
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148 (void)mailbox_search_deinit(&trash->search_ctx);
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149
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150 if (size_needed == 0) {
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151 (void)mailbox_transaction_commit(&trash->trans,
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152 MAILBOX_SYNC_FLAG_FULL_WRITE);
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153 } else {
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154 /* couldn't get enough space, don't expunge anything */
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155 mailbox_transaction_rollback(&trash->trans);
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156 }
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157
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158 mailbox_close(&trash->box);
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159 }
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160 return size_needed == 0;
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161 }
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162
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163 static int
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164 trash_quota_root_try_alloc(struct quota_root_transaction_context *ctx,
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165 struct mail *mail, bool *too_large_r)
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166 {
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167 struct trash_quota_root *troot = TRASH_CONTEXT(ctx->root);
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168 int ret, i;
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169
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170 for (i = 0; ; i++) {
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171 ret = troot->super.try_alloc(ctx, mail, too_large_r);
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172 if (ret != 0 || *too_large_r)
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173 return ret;
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174
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175 if (i == MAX_RETRY_COUNT) {
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176 /* trash_try_clean_mails() should have returned 0 if
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177 it couldn't get enough space, but allow retrying
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178 it a couple of times if there was some extra space
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179 that was needed.. */
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180 break;
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181 }
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182
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183 /* not enough space. try deleting some from mailbox. */
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184 ret = trash_try_clean_mails(mail_get_physical_size(mail));
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185 if (ret <= 0)
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186 return 0;
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187 }
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188
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189 return 0;
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190 }
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191
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192 static void trash_quota_root_deinit(struct quota_root *root)
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193 {
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194 struct trash_quota_root *troot = TRASH_CONTEXT(root);
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195 void *null = NULL;
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196
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197 array_idx_set(&root->quota_module_contexts,
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198 trash_quota_module_id, &null);
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199 troot->super.deinit(root);
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200 i_free(troot);
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201 }
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202
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203 static void trash_quota_root_created(struct quota_root *root)
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204 {
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205 struct trash_quota_root *troot;
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206
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207 if (trash_next_hook_quota_root_created != NULL)
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208 trash_next_hook_quota_root_created(root);
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209
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210 troot = i_new(struct trash_quota_root, 1);
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211 troot->super = root->v;
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212 root->v.deinit = trash_quota_root_deinit;
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213 root->v.try_alloc = trash_quota_root_try_alloc;
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214
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215 trash_quota_module_id = quota_module_id++;
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216 array_idx_set(&root->quota_module_contexts,
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217 trash_quota_module_id, &troot);
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218 }
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219
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220 static int trash_mailbox_priority_cmp(const void *p1, const void *p2)
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221 {
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222 const struct trash_mailbox *t1 = p1, *t2 = p2;
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223
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224 return t1->priority - t2->priority;
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225 }
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226
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227 static int read_configuration(const char *path)
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228 {
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229 struct istream *input;
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230 const char *line, *name;
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231 struct trash_mailbox *trash;
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232 int fd;
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233
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234 fd = open(path, O_RDONLY);
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235 if (fd == -1) {
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236 if (errno != ENOENT)
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237 i_error("open(%s) failed: %m", path);
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238 return -1;
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239 }
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240
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241 p_clear(config_pool);
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242 ARRAY_CREATE(&trash_boxes, config_pool, struct trash_mailbox, 8);
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243
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244 input = i_stream_create_file(fd, default_pool, (size_t)-1, FALSE);
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245 while ((line = i_stream_read_next_line(input)) != NULL) {
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246 /* <priority> <mailbox name> */
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247 name = strchr(line, ' ');
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248 if (name == NULL || name[1] == '\0')
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249 continue;
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250
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251 trash = array_append_space(&trash_boxes);
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252 trash->name = p_strdup(config_pool, name+1);
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253 trash->priority = atoi(t_strdup_until(line, name));
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254 }
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255 i_stream_destroy(&input);
3738
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256 (void)close(fd);
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257
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258 qsort(array_get_modifyable(&trash_boxes, NULL),
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259 array_count(&trash_boxes), sizeof(struct trash_mailbox),
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260 trash_mailbox_priority_cmp);
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261 return 0;
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262 }
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263
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264 void trash_plugin_init(void)
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265 {
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266 trash_next_hook_quota_root_created = hook_quota_root_created;
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267
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268 config_pool = pool_alloconly_create("trash config", 1024);
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269 if (read_configuration(home_expand(LOCAL_CONFIG_FILE)) < 0) {
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270 if (read_configuration(GLOBAL_CONFIG_FILE) < 0)
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271 return;
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272 }
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273
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274 hook_quota_root_created = trash_quota_root_created;
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275 }
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276
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277 void trash_plugin_deinit(void)
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278 {
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279 pool_unref(config_pool);
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280 hook_quota_root_created = trash_next_hook_quota_root_created;
3738
732b62dc1976 Added beginnings of plugin infrastructure. TODO: These could be optionally
Timo Sirainen <tss@iki.fi>
parents:
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281 }